diff --git a/MAINTAINERS b/MAINTAINERS index edc32575828b5..1cf05aee91afc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7244,9 +7244,6 @@ F: include/linux/fs.h F: include/linux/fs_types.h F: include/uapi/linux/fs.h F: include/uapi/linux/openat2.h -X: fs/io-wq.c -X: fs/io-wq.h -X: fs/io_uring.c FINTEK F75375S HARDWARE MONITOR AND FAN CONTROLLER DRIVER M: Riku Voipio @@ -9818,9 +9815,7 @@ L: io-uring@vger.kernel.org S: Maintained T: git git://git.kernel.dk/linux-block T: git git://git.kernel.dk/liburing -F: fs/io-wq.c -F: fs/io-wq.h -F: fs/io_uring.c +F: io_uring/ F: include/linux/io_uring.h F: include/uapi/linux/io_uring.h F: tools/io_uring/ diff --git a/Makefile b/Makefile index bc1cf1200b629..7825a96e9c360 100644 --- a/Makefile +++ b/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 VERSION = 5 PATCHLEVEL = 15 -SUBLEVEL = 82 +SUBLEVEL = 83 EXTRAVERSION = NAME = Trick or Treat @@ -1150,7 +1150,9 @@ export MODORDER := $(extmod_prefix)modules.order export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps ifeq ($(KBUILD_EXTMOD),) -core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/ +core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ +core-$(CONFIG_BLOCK) += block/ +core-$(CONFIG_IO_URING) += io_uring/ vmlinux-dirs := $(patsubst %/,%,$(filter %/, \ $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi index c8206c636a01f..95f22513a7c02 100644 --- a/arch/arm/boot/dts/imx7s.dtsi +++ b/arch/arm/boot/dts/imx7s.dtsi @@ -1252,10 +1252,10 @@ clocks = <&clks IMX7D_NAND_USDHC_BUS_RAWNAND_CLK>; }; - gpmi: nand-controller@33002000 { + gpmi: nand-controller@33002000{ compatible = "fsl,imx7d-gpmi-nand"; #address-cells = <1>; - #size-cells = <0>; + #size-cells = <1>; reg = <0x33002000 0x2000>, <0x33004000 0x4000>; reg-names = "gpmi-nand", "bch"; interrupts = ; diff --git a/arch/arm/boot/dts/rk3036-evb.dts b/arch/arm/boot/dts/rk3036-evb.dts index 2a7e6624efb93..94216f870b57c 100644 --- a/arch/arm/boot/dts/rk3036-evb.dts +++ b/arch/arm/boot/dts/rk3036-evb.dts @@ -31,11 +31,10 @@ &i2c1 { status = "okay"; - hym8563: hym8563@51 { + hym8563: rtc@51 { compatible = "haoyu,hym8563"; reg = <0x51>; #clock-cells = <0>; - clock-frequency = <32768>; clock-output-names = "xin32k"; }; }; diff --git a/arch/arm/boot/dts/rk3188-radxarock.dts b/arch/arm/boot/dts/rk3188-radxarock.dts index 36c0945f43b22..3718fac62841c 100644 --- a/arch/arm/boot/dts/rk3188-radxarock.dts +++ b/arch/arm/boot/dts/rk3188-radxarock.dts @@ -71,7 +71,7 @@ #sound-dai-cells = <0>; }; - ir_recv: gpio-ir-receiver { + ir_recv: ir-receiver { compatible = "gpio-ir-receiver"; gpios = <&gpio0 RK_PB2 GPIO_ACTIVE_LOW>; pinctrl-names = "default"; diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi index 2c606494b78c4..e07b1d79c470a 100644 --- a/arch/arm/boot/dts/rk3188.dtsi +++ b/arch/arm/boot/dts/rk3188.dtsi @@ -378,7 +378,7 @@ rockchip,pins = <2 RK_PD3 1 &pcfg_pull_none>; }; - lcdc1_rgb24: ldcd1-rgb24 { + lcdc1_rgb24: lcdc1-rgb24 { rockchip,pins = <2 RK_PA0 1 &pcfg_pull_none>, <2 RK_PA1 1 &pcfg_pull_none>, <2 RK_PA2 1 &pcfg_pull_none>, @@ -606,7 +606,6 @@ &global_timer { interrupts = ; - status = "disabled"; }; &local_timer { diff --git a/arch/arm/boot/dts/rk3288-evb-act8846.dts b/arch/arm/boot/dts/rk3288-evb-act8846.dts index be695b8c1f672..8a635c2431274 100644 --- a/arch/arm/boot/dts/rk3288-evb-act8846.dts +++ b/arch/arm/boot/dts/rk3288-evb-act8846.dts @@ -54,7 +54,7 @@ vin-supply = <&vcc_sys>; }; - hym8563@51 { + rtc@51 { compatible = "haoyu,hym8563"; reg = <0x51>; diff --git a/arch/arm/boot/dts/rk3288-firefly.dtsi b/arch/arm/boot/dts/rk3288-firefly.dtsi index 7fb582302b326..74ba7e21850a5 100644 --- a/arch/arm/boot/dts/rk3288-firefly.dtsi +++ b/arch/arm/boot/dts/rk3288-firefly.dtsi @@ -233,11 +233,10 @@ vin-supply = <&vcc_sys>; }; - hym8563: hym8563@51 { + hym8563: rtc@51 { compatible = "haoyu,hym8563"; reg = <0x51>; #clock-cells = <0>; - clock-frequency = <32768>; clock-output-names = "xin32k"; interrupt-parent = <&gpio7>; interrupts = ; diff --git a/arch/arm/boot/dts/rk3288-miqi.dts b/arch/arm/boot/dts/rk3288-miqi.dts index 713f55e143c69..db1eb648e0e1a 100644 --- a/arch/arm/boot/dts/rk3288-miqi.dts +++ b/arch/arm/boot/dts/rk3288-miqi.dts @@ -162,11 +162,10 @@ vin-supply = <&vcc_sys>; }; - hym8563: hym8563@51 { + hym8563: rtc@51 { compatible = "haoyu,hym8563"; reg = <0x51>; #clock-cells = <0>; - clock-frequency = <32768>; clock-output-names = "xin32k"; }; diff --git a/arch/arm/boot/dts/rk3288-rock2-square.dts b/arch/arm/boot/dts/rk3288-rock2-square.dts index c4d1d142d8c68..bc44606ca05d8 100644 --- a/arch/arm/boot/dts/rk3288-rock2-square.dts +++ b/arch/arm/boot/dts/rk3288-rock2-square.dts @@ -165,11 +165,10 @@ }; &i2c0 { - hym8563: hym8563@51 { + hym8563: rtc@51 { compatible = "haoyu,hym8563"; reg = <0x51>; #clock-cells = <0>; - clock-frequency = <32768>; clock-output-names = "xin32k"; interrupt-parent = <&gpio0>; interrupts = ; diff --git a/arch/arm/boot/dts/rk3288-vmarc-som.dtsi b/arch/arm/boot/dts/rk3288-vmarc-som.dtsi index 0ae2bd150e372..793951655b73b 100644 --- a/arch/arm/boot/dts/rk3288-vmarc-som.dtsi +++ b/arch/arm/boot/dts/rk3288-vmarc-som.dtsi @@ -241,7 +241,6 @@ interrupt-parent = <&gpio5>; interrupts = ; #clock-cells = <0>; - clock-frequency = <32768>; clock-output-names = "hym8563"; pinctrl-names = "default"; pinctrl-0 = <&hym8563_int>; diff --git a/arch/arm/boot/dts/rk3xxx.dtsi b/arch/arm/boot/dts/rk3xxx.dtsi index 616a828e0c6e4..17e89d30de781 100644 --- a/arch/arm/boot/dts/rk3xxx.dtsi +++ b/arch/arm/boot/dts/rk3xxx.dtsi @@ -76,6 +76,13 @@ reg = <0x1013c200 0x20>; interrupts = ; clocks = <&cru CORE_PERI>; + status = "disabled"; + /* The clock source and the sched_clock provided by the arm_global_timer + * on Rockchip rk3066a/rk3188 are quite unstable because their rates + * depend on the CPU frequency. + * Keep the arm_global_timer disabled in order to have the + * DW_APB_TIMER (rk3066a) or ROCKCHIP_TIMER (rk3188) selected by default. + */ }; local_timer: local-timer@1013c600 { diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h index fe87397c3d8c6..bdbc1e590891e 100644 --- a/arch/arm/include/asm/perf_event.h +++ b/arch/arm/include/asm/perf_event.h @@ -17,7 +17,7 @@ extern unsigned long perf_misc_flags(struct pt_regs *regs); #define perf_arch_fetch_caller_regs(regs, __ip) { \ (regs)->ARM_pc = (__ip); \ - (regs)->ARM_fp = (unsigned long) __builtin_frame_address(0); \ + frame_pointer((regs)) = (unsigned long) __builtin_frame_address(0); \ (regs)->ARM_sp = current_stack_pointer; \ (regs)->ARM_cpsr = SVC_MODE; \ } diff --git a/arch/arm/include/asm/pgtable-nommu.h b/arch/arm/include/asm/pgtable-nommu.h index d16aba48fa0a4..090011394477f 100644 --- a/arch/arm/include/asm/pgtable-nommu.h +++ b/arch/arm/include/asm/pgtable-nommu.h @@ -44,12 +44,6 @@ typedef pte_t *pte_addr_t; -/* - * ZERO_PAGE is a global shared page that is always zero: used - * for zero-mapped memory areas etc.. - */ -#define ZERO_PAGE(vaddr) (virt_to_page(0)) - /* * Mark the prot value as uncacheable and unbufferable. */ diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index cd1f84bb40aea..a25c4303fc0e6 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -10,6 +10,15 @@ #include #include +#ifndef __ASSEMBLY__ +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern struct page *empty_zero_page; +#define ZERO_PAGE(vaddr) (empty_zero_page) +#endif + #ifndef CONFIG_MMU #include @@ -156,13 +165,6 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, #define __S111 __PAGE_SHARED_EXEC #ifndef __ASSEMBLY__ -/* - * ZERO_PAGE is a global shared page that is always zero: used - * for zero-mapped memory areas etc.. - */ -extern struct page *empty_zero_page; -#define ZERO_PAGE(vaddr) (empty_zero_page) - extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c index 2658f52903da6..88feffebae219 100644 --- a/arch/arm/mm/nommu.c +++ b/arch/arm/mm/nommu.c @@ -26,6 +26,13 @@ unsigned long vectors_base; +/* + * empty_zero_page is a special page that is used for + * zero-initialized data and COW. + */ +struct page *empty_zero_page; +EXPORT_SYMBOL(empty_zero_page); + #ifdef CONFIG_ARM_MPU struct mpu_rgn_info mpu_rgn_info; #endif @@ -148,9 +155,21 @@ void __init adjust_lowmem_bounds(void) */ void __init paging_init(const struct machine_desc *mdesc) { + void *zero_page; + early_trap_init((void *)vectors_base); mpu_setup(); + + /* allocate the zero page. */ + zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!zero_page) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE); + bootmem_init(); + + empty_zero_page = virt_to_page(zero_page); + flush_dcache_page(empty_zero_page); } /* diff --git a/arch/arm64/boot/dts/rockchip/rk3308-roc-cc.dts b/arch/arm64/boot/dts/rockchip/rk3308-roc-cc.dts index ea6820902ede0..7ea48167747c6 100644 --- a/arch/arm64/boot/dts/rockchip/rk3308-roc-cc.dts +++ b/arch/arm64/boot/dts/rockchip/rk3308-roc-cc.dts @@ -19,7 +19,7 @@ stdout-path = "serial2:1500000n8"; }; - ir_rx { + ir-receiver { compatible = "gpio-ir-receiver"; gpios = <&gpio0 RK_PC0 GPIO_ACTIVE_HIGH>; pinctrl-names = "default"; diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi index 100a769165ef9..a7ec81657503c 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4.dtsi @@ -446,7 +446,6 @@ &i2s1 { rockchip,playback-channels = <2>; rockchip,capture-channels = <2>; - status = "okay"; }; &i2s2 { diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index acda4b6fc8518..2c0704f5eb3c6 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -538,8 +538,10 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) scb_s->eca |= scb_o->eca & ECA_CEI; /* Epoch Extension */ - if (test_kvm_facility(vcpu->kvm, 139)) + if (test_kvm_facility(vcpu->kvm, 139)) { scb_s->ecd |= scb_o->ecd & ECD_MEF; + scb_s->epdx = scb_o->epdx; + } /* etoken */ if (test_kvm_facility(vcpu->kvm, 156)) diff --git a/block/Makefile b/block/Makefile index 41aa1ba69c900..74df168729ecb 100644 --- a/block/Makefile +++ b/block/Makefile @@ -3,7 +3,7 @@ # Makefile for the kernel block layer # -obj-$(CONFIG_BLOCK) := bdev.o fops.o bio.o elevator.o blk-core.o blk-sysfs.o \ +obj-y := bdev.o fops.o bio.o elevator.o blk-core.o blk-sysfs.o \ blk-flush.o blk-settings.o blk-ioc.o blk-map.o \ blk-exec.o blk-merge.o blk-timeout.o \ blk-lib.o blk-mq.o blk-mq-tag.o blk-stat.o \ diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 64d72ea0c3108..69380cb03dd32 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -1901,6 +1901,11 @@ static int btusb_setup_csr(struct hci_dev *hdev) rp = (struct hci_rp_read_local_version *)skb->data; + bt_dev_info(hdev, "CSR: Setting up dongle with HCI ver=%u rev=%04x; LMP ver=%u subver=%04x; manufacturer=%u", + le16_to_cpu(rp->hci_ver), le16_to_cpu(rp->hci_rev), + le16_to_cpu(rp->lmp_ver), le16_to_cpu(rp->lmp_subver), + le16_to_cpu(rp->manufacturer)); + /* Detect a wide host of Chinese controllers that aren't CSR. * * Known fake bcdDevices: 0x0100, 0x0134, 0x1915, 0x2520, 0x7558, 0x8891 diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index f9d5b73343417..4fb4fd4b06bda 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -4,42 +4,101 @@ #include #include +struct devm_clk_state { + struct clk *clk; + void (*exit)(struct clk *clk); +}; + static void devm_clk_release(struct device *dev, void *res) { - clk_put(*(struct clk **)res); + struct devm_clk_state *state = res; + + if (state->exit) + state->exit(state->clk); + + clk_put(state->clk); } -struct clk *devm_clk_get(struct device *dev, const char *id) +static struct clk *__devm_clk_get(struct device *dev, const char *id, + struct clk *(*get)(struct device *dev, const char *id), + int (*init)(struct clk *clk), + void (*exit)(struct clk *clk)) { - struct clk **ptr, *clk; + struct devm_clk_state *state; + struct clk *clk; + int ret; - ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); - if (!ptr) + state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL); + if (!state) return ERR_PTR(-ENOMEM); - clk = clk_get(dev, id); - if (!IS_ERR(clk)) { - *ptr = clk; - devres_add(dev, ptr); - } else { - devres_free(ptr); + clk = get(dev, id); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + goto err_clk_get; } + if (init) { + ret = init(clk); + if (ret) + goto err_clk_init; + } + + state->clk = clk; + state->exit = exit; + + devres_add(dev, state); + return clk; + +err_clk_init: + + clk_put(clk); +err_clk_get: + + devres_free(state); + return ERR_PTR(ret); +} + +struct clk *devm_clk_get(struct device *dev, const char *id) +{ + return __devm_clk_get(dev, id, clk_get, NULL, NULL); } EXPORT_SYMBOL(devm_clk_get); -struct clk *devm_clk_get_optional(struct device *dev, const char *id) +struct clk *devm_clk_get_prepared(struct device *dev, const char *id) { - struct clk *clk = devm_clk_get(dev, id); + return __devm_clk_get(dev, id, clk_get, clk_prepare, clk_unprepare); +} +EXPORT_SYMBOL_GPL(devm_clk_get_prepared); - if (clk == ERR_PTR(-ENOENT)) - return NULL; +struct clk *devm_clk_get_enabled(struct device *dev, const char *id) +{ + return __devm_clk_get(dev, id, clk_get, + clk_prepare_enable, clk_disable_unprepare); +} +EXPORT_SYMBOL_GPL(devm_clk_get_enabled); - return clk; +struct clk *devm_clk_get_optional(struct device *dev, const char *id) +{ + return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL); } EXPORT_SYMBOL(devm_clk_get_optional); +struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id) +{ + return __devm_clk_get(dev, id, clk_get_optional, + clk_prepare, clk_unprepare); +} +EXPORT_SYMBOL_GPL(devm_clk_get_optional_prepared); + +struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id) +{ + return __devm_clk_get(dev, id, clk_get_optional, + clk_prepare_enable, clk_disable_unprepare); +} +EXPORT_SYMBOL_GPL(devm_clk_get_optional_enabled); + struct clk_bulk_devres { struct clk_bulk_data *clks; int num_clks; diff --git a/drivers/gpio/gpio-amd8111.c b/drivers/gpio/gpio-amd8111.c index 14e6b3e64add5..6f3ded619c8b2 100644 --- a/drivers/gpio/gpio-amd8111.c +++ b/drivers/gpio/gpio-amd8111.c @@ -226,7 +226,10 @@ found: ioport_unmap(gp.pm); goto out; } + return 0; + out: + pci_dev_put(pdev); return err; } @@ -234,6 +237,7 @@ static void __exit amd_gpio_exit(void) { gpiochip_remove(&gp.chip); ioport_unmap(gp.pm); + pci_dev_put(gp.pdev); } module_init(amd_gpio_init); diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c index d32928c1efe0f..a197f698efebb 100644 --- a/drivers/gpio/gpio-rockchip.c +++ b/drivers/gpio/gpio-rockchip.c @@ -605,6 +605,7 @@ static int rockchip_gpiolib_register(struct rockchip_pin_bank *bank) return -ENODATA; pctldev = of_pinctrl_get(pctlnp); + of_node_put(pctlnp); if (!pctldev) return -ENODEV; diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 320baed949ee8..67bc96403a4e6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -525,12 +525,13 @@ static int gpiochip_setup_dev(struct gpio_device *gdev) if (ret) return ret; + /* From this point, the .release() function cleans up gpio_device */ + gdev->dev.release = gpiodevice_release; + ret = gpiochip_sysfs_register(gdev); if (ret) goto err_remove_device; - /* From this point, the .release() function cleans up gpio_device */ - gdev->dev.release = gpiodevice_release; dev_dbg(&gdev->dev, "registered GPIOs %d to %d on %s\n", gdev->base, gdev->base + gdev->ngpio - 1, gdev->chip->label ? : "generic"); @@ -594,11 +595,12 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, struct lock_class_key *request_key) { struct fwnode_handle *fwnode = gc->parent ? dev_fwnode(gc->parent) : NULL; - unsigned long flags; - int ret = 0; - unsigned i; - int base = gc->base; struct gpio_device *gdev; + unsigned long flags; + unsigned int i; + u32 ngpios = 0; + int base = 0; + int ret = 0; /* * First: allocate and populate the internal stat container, and @@ -640,22 +642,43 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, else gdev->owner = THIS_MODULE; - gdev->descs = kcalloc(gc->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); - if (!gdev->descs) { - ret = -ENOMEM; - goto err_free_dev_name; + /* + * Try the device properties if the driver didn't supply the number + * of GPIO lines. + */ + ngpios = gc->ngpio; + if (ngpios == 0) { + ret = device_property_read_u32(&gdev->dev, "ngpios", &ngpios); + if (ret == -ENODATA) + /* + * -ENODATA means that there is no property found and + * we want to issue the error message to the user. + * Besides that, we want to return different error code + * to state that supplied value is not valid. + */ + ngpios = 0; + else if (ret) + goto err_free_dev_name; + + gc->ngpio = ngpios; } if (gc->ngpio == 0) { chip_err(gc, "tried to insert a GPIO chip with zero lines\n"); ret = -EINVAL; - goto err_free_descs; + goto err_free_dev_name; } if (gc->ngpio > FASTPATH_NGPIO) chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n", gc->ngpio, FASTPATH_NGPIO); + gdev->descs = kcalloc(gc->ngpio, sizeof(*gdev->descs), GFP_KERNEL); + if (!gdev->descs) { + ret = -ENOMEM; + goto err_free_dev_name; + } + gdev->label = kstrdup_const(gc->label ?: "unknown", GFP_KERNEL); if (!gdev->label) { ret = -ENOMEM; @@ -674,11 +697,13 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, * it may be a pipe dream. It will not happen before we get rid * of the sysfs interface anyways. */ + base = gc->base; if (base < 0) { base = gpiochip_find_base(gc->ngpio); if (base < 0) { - ret = base; spin_unlock_irqrestore(&gpio_lock, flags); + ret = base; + base = 0; goto err_free_label; } /* @@ -786,6 +811,11 @@ err_remove_of_chip: err_free_gpiochip_mask: gpiochip_remove_pin_ranges(gc); gpiochip_free_valid_mask(gc); + if (gdev->dev.release) { + /* release() has been registered by gpiochip_setup_dev() */ + put_device(&gdev->dev); + goto err_print_message; + } err_remove_from_list: spin_lock_irqsave(&gpio_lock, flags); list_del(&gdev->list); @@ -799,13 +829,14 @@ err_free_dev_name: err_free_ida: ida_free(&gpio_ida, gdev->id); err_free_gdev: + kfree(gdev); +err_print_message: /* failures here can mean systems won't boot... */ if (ret != -EPROBE_DEFER) { pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, - gdev->base, gdev->base + gdev->ngpio - 1, + base, base + (int)ngpios - 1, gc->label ? : "generic", ret); } - kfree(gdev); return ret; } EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c index 9014f71d52ddf..f14f7bb3cf0c2 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c @@ -978,13 +978,13 @@ static void sdma_v4_0_ring_emit_fence(struct amdgpu_ring *ring, u64 addr, u64 se /** - * sdma_v4_0_gfx_stop - stop the gfx async dma engines + * sdma_v4_0_gfx_enable - enable the gfx async dma engines * * @adev: amdgpu_device pointer - * - * Stop the gfx async dma ring buffers (VEGA10). + * @enable: enable SDMA RB/IB + * control the gfx async dma ring buffers (VEGA10). */ -static void sdma_v4_0_gfx_stop(struct amdgpu_device *adev) +static void sdma_v4_0_gfx_enable(struct amdgpu_device *adev, bool enable) { struct amdgpu_ring *sdma[AMDGPU_MAX_SDMA_INSTANCES]; u32 rb_cntl, ib_cntl; @@ -999,10 +999,10 @@ static void sdma_v4_0_gfx_stop(struct amdgpu_device *adev) } rb_cntl = RREG32_SDMA(i, mmSDMA0_GFX_RB_CNTL); - rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, 0); + rb_cntl = REG_SET_FIELD(rb_cntl, SDMA0_GFX_RB_CNTL, RB_ENABLE, enable ? 1 : 0); WREG32_SDMA(i, mmSDMA0_GFX_RB_CNTL, rb_cntl); ib_cntl = RREG32_SDMA(i, mmSDMA0_GFX_IB_CNTL); - ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, 0); + ib_cntl = REG_SET_FIELD(ib_cntl, SDMA0_GFX_IB_CNTL, IB_ENABLE, enable ? 1 : 0); WREG32_SDMA(i, mmSDMA0_GFX_IB_CNTL, ib_cntl); } } @@ -1129,7 +1129,7 @@ static void sdma_v4_0_enable(struct amdgpu_device *adev, bool enable) int i; if (!enable) { - sdma_v4_0_gfx_stop(adev); + sdma_v4_0_gfx_enable(adev, enable); sdma_v4_0_rlc_stop(adev); if (adev->sdma.has_page_queue) sdma_v4_0_page_stop(adev); @@ -2063,8 +2063,10 @@ static int sdma_v4_0_suspend(void *handle) struct amdgpu_device *adev = (struct amdgpu_device *)handle; /* SMU saves SDMA state for us */ - if (adev->in_s0ix) + if (adev->in_s0ix) { + sdma_v4_0_gfx_enable(adev, false); return 0; + } return sdma_v4_0_hw_fini(adev); } @@ -2074,8 +2076,12 @@ static int sdma_v4_0_resume(void *handle) struct amdgpu_device *adev = (struct amdgpu_device *)handle; /* SMU restores SDMA state for us */ - if (adev->in_s0ix) + if (adev->in_s0ix) { + sdma_v4_0_enable(adev, true); + sdma_v4_0_gfx_enable(adev, true); + amdgpu_ttm_set_buffer_funcs_status(adev, true); return 0; + } return sdma_v4_0_hw_init(adev); } diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 392a9c56e9a00..f895ef1939fa0 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -796,7 +796,7 @@ static int sp_tx_edid_read(struct anx7625_data *ctx, int count, blocks_num; u8 pblock_buf[MAX_DPCD_BUFFER_SIZE]; u8 i, j; - u8 g_edid_break = 0; + int g_edid_break = 0; int ret; struct device *dev = &ctx->client->dev; @@ -827,7 +827,7 @@ static int sp_tx_edid_read(struct anx7625_data *ctx, g_edid_break = edid_read(ctx, offset, pblock_buf); - if (g_edid_break) + if (g_edid_break < 0) break; memcpy(&pedid_blocks_buf[offset], diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index d3129a3e6ab76..8bb403bc712a4 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -2594,6 +2594,9 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, * if supported. In any case the default RGB888 format is added */ + /* Default 8bit RGB fallback */ + output_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24; + if (max_bpc >= 16 && info->bpc == 16) { if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444) output_fmts[i++] = MEDIA_BUS_FMT_YUV16_1X48; @@ -2627,9 +2630,6 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge, if (info->color_formats & DRM_COLOR_FORMAT_YCRCB444) output_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24; - /* Default 8bit RGB fallback */ - output_fmts[i++] = MEDIA_BUS_FMT_RGB888_1X24; - *num_output_fmts = i; return output_fmts; diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index 45a5f1e48f0ef..bbedce0eeddae 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -920,9 +920,9 @@ static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata) &pdata->bridge.encoder->crtc->state->adjusted_mode; u8 hsync_polarity = 0, vsync_polarity = 0; - if (mode->flags & DRM_MODE_FLAG_PHSYNC) + if (mode->flags & DRM_MODE_FLAG_NHSYNC) hsync_polarity = CHA_HSYNC_POLARITY; - if (mode->flags & DRM_MODE_FLAG_PVSYNC) + if (mode->flags & DRM_MODE_FLAG_NVSYNC) vsync_polarity = CHA_VSYNC_POLARITY; ti_sn65dsi86_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG, diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index a30ffc07470cc..15c3849e995bd 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -541,12 +541,20 @@ static void drm_gem_shmem_vm_open(struct vm_area_struct *vma) { struct drm_gem_object *obj = vma->vm_private_data; struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); - int ret; WARN_ON(shmem->base.import_attach); - ret = drm_gem_shmem_get_pages(shmem); - WARN_ON_ONCE(ret != 0); + mutex_lock(&shmem->pages_lock); + + /* + * We should have already pinned the pages when the buffer was first + * mmap'd, vm_open() just grabs an additional reference for the new + * mm the vma is getting copied into (ie. on fork()). + */ + if (!WARN_ON_ONCE(!shmem->pages_use_count)) + shmem->pages_use_count++; + + mutex_unlock(&shmem->pages_lock); drm_gem_vm_open(vma); } @@ -591,10 +599,8 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct } ret = drm_gem_shmem_get_pages(shmem); - if (ret) { - drm_gem_vm_close(vma); + if (ret) return ret; - } vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND; vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c index 47eb3a50dd08e..8d2437fa6894b 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c @@ -1085,21 +1085,21 @@ int vmw_mksstat_add_ioctl(struct drm_device *dev, void *data, reset_ppn_array(pdesc->strsPPNs, ARRAY_SIZE(pdesc->strsPPNs)); /* Pin mksGuestStat user pages and store those in the instance descriptor */ - nr_pinned_stat = pin_user_pages(arg->stat, num_pages_stat, FOLL_LONGTERM, pages_stat, NULL); + nr_pinned_stat = pin_user_pages_fast(arg->stat, num_pages_stat, FOLL_LONGTERM, pages_stat); if (num_pages_stat != nr_pinned_stat) goto err_pin_stat; for (i = 0; i < num_pages_stat; ++i) pdesc->statPPNs[i] = page_to_pfn(pages_stat[i]); - nr_pinned_info = pin_user_pages(arg->info, num_pages_info, FOLL_LONGTERM, pages_info, NULL); + nr_pinned_info = pin_user_pages_fast(arg->info, num_pages_info, FOLL_LONGTERM, pages_info); if (num_pages_info != nr_pinned_info) goto err_pin_info; for (i = 0; i < num_pages_info; ++i) pdesc->infoPPNs[i] = page_to_pfn(pages_info[i]); - nr_pinned_strs = pin_user_pages(arg->strs, num_pages_strs, FOLL_LONGTERM, pages_strs, NULL); + nr_pinned_strs = pin_user_pages_fast(arg->strs, num_pages_strs, FOLL_LONGTERM, pages_strs); if (num_pages_strs != nr_pinned_strs) goto err_pin_strs; diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c index bd157fb21b450..605ff05d449fc 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c @@ -953,6 +953,10 @@ int vmw_kms_sou_init_display(struct vmw_private *dev_priv) struct drm_device *dev = &dev_priv->drm; int i, ret; + /* Screen objects won't work if GMR's aren't available */ + if (!dev_priv->has_gmr) + return -ENOSYS; + if (!(dev_priv->capabilities & SVGA_CAP_SCREEN_OBJECT_2)) { return -ENOSYS; } diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index dbed2524fd47b..ef9c799fa3715 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1310,6 +1310,9 @@ static s32 snto32(__u32 value, unsigned n) if (!value || !n) return 0; + if (n > 32) + n = 32; + switch (n) { case 8: return ((__s8)value); case 16: return ((__s16)value); diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index c8a313c84a57d..78b55f845d2d4 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -261,6 +261,7 @@ #define USB_DEVICE_ID_CH_AXIS_295 0x001c #define USB_VENDOR_ID_CHERRY 0x046a +#define USB_DEVICE_ID_CHERRY_MOUSE_000C 0x000c #define USB_DEVICE_ID_CHERRY_CYMOTION 0x0023 #define USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR 0x0027 @@ -892,6 +893,7 @@ #define USB_DEVICE_ID_MS_XBOX_ONE_S_CONTROLLER 0x02fd #define USB_DEVICE_ID_MS_PIXART_MOUSE 0x00cb #define USB_DEVICE_ID_8BITDO_SN30_PRO_PLUS 0x02e0 +#define USB_DEVICE_ID_MS_MOUSE_0783 0x0783 #define USB_VENDOR_ID_MOJO 0x8282 #define USB_DEVICE_ID_RETRO_ADAPTER 0x3201 @@ -1182,6 +1184,7 @@ #define USB_DEVICE_ID_SYNAPTICS_DELL_K15A 0x6e21 #define USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1002 0x73f4 #define USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003 0x73f5 +#define USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_017 0x73f6 #define USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5 0x81a7 #define USB_VENDOR_ID_TEXAS_INSTRUMENTS 0x2047 @@ -1338,6 +1341,7 @@ #define USB_VENDOR_ID_PRIMAX 0x0461 #define USB_DEVICE_ID_PRIMAX_MOUSE_4D22 0x4d22 +#define USB_DEVICE_ID_PRIMAX_MOUSE_4E2A 0x4e2a #define USB_DEVICE_ID_PRIMAX_KEYBOARD 0x4e05 #define USB_DEVICE_ID_PRIMAX_REZEL 0x4e72 #define USB_DEVICE_ID_PRIMAX_PIXART_MOUSE_4D0F 0x4d0f diff --git a/drivers/hid/hid-ite.c b/drivers/hid/hid-ite.c index 430fa4f52ed3b..75ebfcf318896 100644 --- a/drivers/hid/hid-ite.c +++ b/drivers/hid/hid-ite.c @@ -121,6 +121,11 @@ static const struct hid_device_id ite_devices[] = { USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_ACER_ONE_S1003), .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT }, + /* ITE8910 USB kbd ctlr, with Synaptics touchpad connected to it. */ + { HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, + USB_VENDOR_ID_SYNAPTICS, + USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_017), + .driver_data = QUIRK_TOUCHPAD_ON_OFF_REPORT }, { } }; MODULE_DEVICE_TABLE(hid, ite_devices); diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c index 5e6a0cef2a06d..e3fcf1353fb3b 100644 --- a/drivers/hid/hid-lg4ff.c +++ b/drivers/hid/hid-lg4ff.c @@ -872,6 +872,12 @@ static ssize_t lg4ff_alternate_modes_store(struct device *dev, struct device_att return -ENOMEM; i = strlen(lbuf); + + if (i == 0) { + kfree(lbuf); + return -EINVAL; + } + if (lbuf[i-1] == '\n') { if (i == 1) { kfree(lbuf); diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c index 8d36cb7551cf1..fc1e061900bc0 100644 --- a/drivers/hid/hid-quirks.c +++ b/drivers/hid/hid-quirks.c @@ -54,6 +54,7 @@ static const struct hid_device_id hid_quirks[] = { { HID_USB_DEVICE(USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_FLIGHT_SIM_YOKE), HID_QUIRK_NOGET }, { HID_USB_DEVICE(USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_PEDALS), HID_QUIRK_NOGET }, { HID_USB_DEVICE(USB_VENDOR_ID_CH, USB_DEVICE_ID_CH_PRO_THROTTLE), HID_QUIRK_NOGET }, + { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_MOUSE_000C), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_K65RGB), HID_QUIRK_NO_INIT_REPORTS }, { HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_K65RGB_RAPIDFIRE), HID_QUIRK_NO_INIT_REPORTS | HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, USB_DEVICE_ID_CORSAIR_K70RGB), HID_QUIRK_NO_INIT_REPORTS }, @@ -122,6 +123,7 @@ static const struct hid_device_id hid_quirks[] = { { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C05A), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOUSE_C06A), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_MCS, USB_DEVICE_ID_MCS_GAMEPADBLOCK), HID_QUIRK_MULTI_INPUT }, + { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_MOUSE_0783), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_PIXART_MOUSE), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_POWER_COVER), HID_QUIRK_NO_INIT_REPORTS }, { HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_SURFACE3_COVER), HID_QUIRK_NO_INIT_REPORTS }, @@ -146,6 +148,7 @@ static const struct hid_device_id hid_quirks[] = { { HID_USB_DEVICE(USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_OPTICAL_TOUCH_SCREEN), HID_QUIRK_NO_INIT_REPORTS }, { HID_USB_DEVICE(USB_VENDOR_ID_PIXART, USB_DEVICE_ID_PIXART_USB_OPTICAL_MOUSE), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_MOUSE_4D22), HID_QUIRK_ALWAYS_POLL }, + { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_MOUSE_4E2A), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_PIXART_MOUSE_4D0F), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_PIXART_MOUSE_4D65), HID_QUIRK_ALWAYS_POLL }, { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_PIXART_MOUSE_4E22), HID_QUIRK_ALWAYS_POLL }, diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 033b0c83272fe..30c8497f7c118 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -788,7 +788,13 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, num_buffers = max_t(unsigned int, *count, q->min_buffers_needed); num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME); memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); + /* + * Set this now to ensure that drivers see the correct q->memory value + * in the queue_setup op. + */ + mutex_lock(&q->mmap_lock); q->memory = memory; + mutex_unlock(&q->mmap_lock); /* * Ask the driver how many buffers and planes per buffer it requires. @@ -797,22 +803,27 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, ret = call_qop(q, queue_setup, q, &num_buffers, &num_planes, plane_sizes, q->alloc_devs); if (ret) - return ret; + goto error; /* Check that driver has set sane values */ - if (WARN_ON(!num_planes)) - return -EINVAL; + if (WARN_ON(!num_planes)) { + ret = -EINVAL; + goto error; + } for (i = 0; i < num_planes; i++) - if (WARN_ON(!plane_sizes[i])) - return -EINVAL; + if (WARN_ON(!plane_sizes[i])) { + ret = -EINVAL; + goto error; + } /* Finally, allocate buffers and video memory */ allocated_buffers = __vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes); if (allocated_buffers == 0) { dprintk(q, 1, "memory allocation failed\n"); - return -ENOMEM; + ret = -ENOMEM; + goto error; } /* @@ -853,7 +864,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, if (ret < 0) { /* * Note: __vb2_queue_free() will subtract 'allocated_buffers' - * from q->num_buffers. + * from q->num_buffers and it will reset q->memory to + * VB2_MEMORY_UNKNOWN. */ __vb2_queue_free(q, allocated_buffers); mutex_unlock(&q->mmap_lock); @@ -869,6 +881,12 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, q->waiting_for_buffers = !q->is_output; return 0; + +error: + mutex_lock(&q->mmap_lock); + q->memory = VB2_MEMORY_UNKNOWN; + mutex_unlock(&q->mmap_lock); + return ret; } EXPORT_SYMBOL_GPL(vb2_core_reqbufs); @@ -879,6 +897,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, { unsigned int num_planes = 0, num_buffers, allocated_buffers; unsigned plane_sizes[VB2_MAX_PLANES] = { }; + bool no_previous_buffers = !q->num_buffers; int ret; if (q->num_buffers == VB2_MAX_FRAME) { @@ -886,13 +905,19 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, return -ENOBUFS; } - if (!q->num_buffers) { + if (no_previous_buffers) { if (q->waiting_in_dqbuf && *count) { dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n"); return -EBUSY; } memset(q->alloc_devs, 0, sizeof(q->alloc_devs)); + /* + * Set this now to ensure that drivers see the correct q->memory + * value in the queue_setup op. + */ + mutex_lock(&q->mmap_lock); q->memory = memory; + mutex_unlock(&q->mmap_lock); q->waiting_for_buffers = !q->is_output; } else { if (q->memory != memory) { @@ -915,14 +940,15 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, ret = call_qop(q, queue_setup, q, &num_buffers, &num_planes, plane_sizes, q->alloc_devs); if (ret) - return ret; + goto error; /* Finally, allocate buffers and video memory */ allocated_buffers = __vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes); if (allocated_buffers == 0) { dprintk(q, 1, "memory allocation failed\n"); - return -ENOMEM; + ret = -ENOMEM; + goto error; } /* @@ -953,7 +979,8 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, if (ret < 0) { /* * Note: __vb2_queue_free() will subtract 'allocated_buffers' - * from q->num_buffers. + * from q->num_buffers and it will reset q->memory to + * VB2_MEMORY_UNKNOWN. */ __vb2_queue_free(q, allocated_buffers); mutex_unlock(&q->mmap_lock); @@ -968,6 +995,14 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, *count = allocated_buffers; return 0; + +error: + if (no_previous_buffers) { + mutex_lock(&q->mmap_lock); + q->memory = VB2_MEMORY_UNKNOWN; + mutex_unlock(&q->mmap_lock); + } + return ret; } EXPORT_SYMBOL_GPL(vb2_core_create_bufs); @@ -2124,6 +2159,22 @@ static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, struct vb2_buffer *vb; unsigned int buffer, plane; + /* + * Sanity checks to ensure the lock is held, MEMORY_MMAP is + * used and fileio isn't active. + */ + lockdep_assert_held(&q->mmap_lock); + + if (q->memory != VB2_MEMORY_MMAP) { + dprintk(q, 1, "queue is not currently set up for mmap\n"); + return -EINVAL; + } + + if (vb2_fileio_is_active(q)) { + dprintk(q, 1, "file io in progress\n"); + return -EBUSY; + } + /* * Go over all buffers and their planes, comparing the given offset * with an offset assigned to each plane. If a match is found, @@ -2225,11 +2276,6 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) int ret; unsigned long length; - if (q->memory != VB2_MEMORY_MMAP) { - dprintk(q, 1, "queue is not currently set up for mmap\n"); - return -EINVAL; - } - /* * Check memory area access mode. */ @@ -2251,14 +2297,9 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) mutex_lock(&q->mmap_lock); - if (vb2_fileio_is_active(q)) { - dprintk(q, 1, "mmap: file io in progress\n"); - ret = -EBUSY; - goto unlock; - } - /* - * Find the plane corresponding to the offset passed by userspace. + * Find the plane corresponding to the offset passed by userspace. This + * will return an error if not MEMORY_MMAP or file I/O is in progress. */ ret = __find_plane_by_offset(q, off, &buffer, &plane); if (ret) @@ -2311,22 +2352,25 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q, void *vaddr; int ret; - if (q->memory != VB2_MEMORY_MMAP) { - dprintk(q, 1, "queue is not currently set up for mmap\n"); - return -EINVAL; - } + mutex_lock(&q->mmap_lock); /* - * Find the plane corresponding to the offset passed by userspace. + * Find the plane corresponding to the offset passed by userspace. This + * will return an error if not MEMORY_MMAP or file I/O is in progress. */ ret = __find_plane_by_offset(q, off, &buffer, &plane); if (ret) - return ret; + goto unlock; vb = q->bufs[buffer]; vaddr = vb2_plane_vaddr(vb, plane); + mutex_unlock(&q->mmap_lock); return vaddr ? (unsigned long)vaddr : -EINVAL; + +unlock: + mutex_unlock(&q->mmap_lock); + return ret; } EXPORT_SYMBOL_GPL(vb2_get_unmapped_area); #endif diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c index 003c32fed3f75..942d0005c55e8 100644 --- a/drivers/media/v4l2-core/v4l2-dv-timings.c +++ b/drivers/media/v4l2-core/v4l2-dv-timings.c @@ -145,6 +145,8 @@ bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t, const struct v4l2_bt_timings *bt = &t->bt; const struct v4l2_bt_timings_cap *cap = &dvcap->bt; u32 caps = cap->capabilities; + const u32 max_vert = 10240; + u32 max_hor = 3 * bt->width; if (t->type != V4L2_DV_BT_656_1120) return false; @@ -166,14 +168,20 @@ bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t, if (!bt->interlaced && (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch)) return false; - if (bt->hfrontporch > 2 * bt->width || - bt->hsync > 1024 || bt->hbackporch > 1024) + /* + * Some video receivers cannot properly separate the frontporch, + * backporch and sync values, and instead they only have the total + * blanking. That can be assigned to any of these three fields. + * So just check that none of these are way out of range. + */ + if (bt->hfrontporch > max_hor || + bt->hsync > max_hor || bt->hbackporch > max_hor) return false; - if (bt->vfrontporch > 4096 || - bt->vsync > 128 || bt->vbackporch > 4096) + if (bt->vfrontporch > max_vert || + bt->vsync > max_vert || bt->vbackporch > max_vert) return false; - if (bt->interlaced && (bt->il_vfrontporch > 4096 || - bt->il_vsync > 128 || bt->il_vbackporch > 4096)) + if (bt->interlaced && (bt->il_vfrontporch > max_vert || + bt->il_vsync > max_vert || bt->il_vbackporch > max_vert)) return false; return fnc == NULL || fnc(t, fnc_handle); } diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 99d8881a7d6c2..9871c19d2b4e4 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -2455,13 +2455,11 @@ static int msdc_of_clock_parse(struct platform_device *pdev, if (IS_ERR(host->src_clk_cg)) host->src_clk_cg = NULL; - host->sys_clk_cg = devm_clk_get_optional(&pdev->dev, "sys_cg"); + /* If present, always enable for this clock gate */ + host->sys_clk_cg = devm_clk_get_optional_enabled(&pdev->dev, "sys_cg"); if (IS_ERR(host->sys_clk_cg)) host->sys_clk_cg = NULL; - /* If present, always enable for this clock gate */ - clk_prepare_enable(host->sys_clk_cg); - host->bulk_clks[0].id = "pclk_cg"; host->bulk_clks[1].id = "axi_cg"; host->bulk_clks[2].id = "ahb_cg"; diff --git a/drivers/net/can/usb/esd_usb2.c b/drivers/net/can/usb/esd_usb2.c index c6068a251fbed..9ed048cb07e6d 100644 --- a/drivers/net/can/usb/esd_usb2.c +++ b/drivers/net/can/usb/esd_usb2.c @@ -227,6 +227,10 @@ static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, u8 rxerr = msg->msg.rx.data[2]; u8 txerr = msg->msg.rx.data[3]; + netdev_dbg(priv->netdev, + "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n", + msg->msg.rx.dlc, state, ecc, rxerr, txerr); + skb = alloc_can_err_skb(priv->netdev, &cf); if (skb == NULL) { stats->rx_dropped++; @@ -253,6 +257,8 @@ static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, break; default: priv->can.state = CAN_STATE_ERROR_ACTIVE; + txerr = 0; + rxerr = 0; break; } } else { diff --git a/drivers/net/dsa/sja1105/sja1105_devlink.c b/drivers/net/dsa/sja1105/sja1105_devlink.c index 10c6fea1227fa..bdbbff2a79095 100644 --- a/drivers/net/dsa/sja1105/sja1105_devlink.c +++ b/drivers/net/dsa/sja1105/sja1105_devlink.c @@ -95,6 +95,8 @@ static int sja1105_setup_devlink_regions(struct dsa_switch *ds) if (IS_ERR(region)) { while (--i >= 0) dsa_devlink_region_destroy(priv->regions[i]); + + kfree(priv->regions); return PTR_ERR(region); } diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index 1a2a7536ff8aa..ef4d8d6c2bd7a 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -1025,7 +1025,7 @@ static int sja1105_init_l2_policing(struct sja1105_private *priv) policing[bcast].sharindx = port; /* Only SJA1110 has multicast policers */ - if (mcast <= table->ops->max_entry_count) + if (mcast < table->ops->max_entry_count) policing[mcast].sharindx = port; } diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c index c560ad06f0be3..a95bac4e14f6a 100644 --- a/drivers/net/ethernet/aeroflex/greth.c +++ b/drivers/net/ethernet/aeroflex/greth.c @@ -258,6 +258,7 @@ static int greth_init_rings(struct greth_private *greth) if (dma_mapping_error(greth->dev, dma_addr)) { if (netif_msg_ifup(greth)) dev_err(greth->dev, "Could not create initial DMA mapping\n"); + dev_kfree_skb(skb); goto cleanup; } greth->rx_skbuff[i] = skb; diff --git a/drivers/net/ethernet/broadcom/Kconfig b/drivers/net/ethernet/broadcom/Kconfig index 1cd3c289f49be..cd1706909044d 100644 --- a/drivers/net/ethernet/broadcom/Kconfig +++ b/drivers/net/ethernet/broadcom/Kconfig @@ -71,13 +71,14 @@ config BCM63XX_ENET config BCMGENET tristate "Broadcom GENET internal MAC support" depends on HAS_IOMEM + depends on PTP_1588_CLOCK_OPTIONAL || !ARCH_BCM2835 select MII select PHYLIB select FIXED_PHY select BCM7XXX_PHY select MDIO_BCM_UNIMAC select DIMLIB - select BROADCOM_PHY if (ARCH_BCM2835 && PTP_1588_CLOCK_OPTIONAL) + select BROADCOM_PHY if ARCH_BCM2835 help This driver supports the built-in Ethernet MACs found in the Broadcom BCM7xxx Set Top Box family chipset. diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c index a27227aeae880..b43b97e15a6f0 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c @@ -2250,7 +2250,7 @@ static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent) err = register_netdev(netdev); if (err) { dev_err(dev, "Failed to register netdevice\n"); - goto err_unregister_interrupts; + goto err_destroy_workqueue; } nic->msg_enable = debug; @@ -2259,6 +2259,8 @@ static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent) return 0; +err_destroy_workqueue: + destroy_workqueue(nic->nicvf_rx_mode_wq); err_unregister_interrupts: nicvf_unregister_interrupts(nic); err_free_netdev: diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c index cacd454ac696c..c39b866e2582d 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch-flower.c @@ -132,6 +132,7 @@ int dpaa2_switch_acl_entry_add(struct dpaa2_switch_filter_block *filter_block, DMA_TO_DEVICE); if (unlikely(dma_mapping_error(dev, acl_entry_cfg->key_iova))) { dev_err(dev, "DMA mapping failed\n"); + kfree(cmd_buff); return -EFAULT; } @@ -142,6 +143,7 @@ int dpaa2_switch_acl_entry_add(struct dpaa2_switch_filter_block *filter_block, DMA_TO_DEVICE); if (err) { dev_err(dev, "dpsw_acl_add_entry() failed %d\n", err); + kfree(cmd_buff); return err; } @@ -172,6 +174,7 @@ dpaa2_switch_acl_entry_remove(struct dpaa2_switch_filter_block *block, DMA_TO_DEVICE); if (unlikely(dma_mapping_error(dev, acl_entry_cfg->key_iova))) { dev_err(dev, "DMA mapping failed\n"); + kfree(cmd_buff); return -EFAULT; } @@ -182,6 +185,7 @@ dpaa2_switch_acl_entry_remove(struct dpaa2_switch_filter_block *block, DMA_TO_DEVICE); if (err) { dev_err(dev, "dpsw_acl_remove_entry() failed %d\n", err); + kfree(cmd_buff); return err; } diff --git a/drivers/net/ethernet/hisilicon/hisi_femac.c b/drivers/net/ethernet/hisilicon/hisi_femac.c index 22bf914f2dbd0..ea3e67cf5ffa1 100644 --- a/drivers/net/ethernet/hisilicon/hisi_femac.c +++ b/drivers/net/ethernet/hisilicon/hisi_femac.c @@ -283,7 +283,7 @@ static int hisi_femac_rx(struct net_device *dev, int limit) skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(&priv->napi, skb); dev->stats.rx_packets++; - dev->stats.rx_bytes += skb->len; + dev->stats.rx_bytes += len; next: pos = (pos + 1) % rxq->num; if (rx_pkts_num >= limit) diff --git a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c index c1aae0fca5e98..0a70fb979f0c3 100644 --- a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c +++ b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c @@ -550,7 +550,7 @@ static int hix5hd2_rx(struct net_device *dev, int limit) skb->protocol = eth_type_trans(skb, dev); napi_gro_receive(&priv->napi, skb); dev->stats.rx_packets++; - dev->stats.rx_bytes += skb->len; + dev->stats.rx_bytes += len; next: pos = dma_ring_incr(pos, RX_DESC_NUM); } diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 407bbb4cc236f..7e41ce188cc6a 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -5941,9 +5941,9 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb, e1000_tx_queue(tx_ring, tx_flags, count); /* Make sure there is space in the ring for the next send. */ e1000_maybe_stop_tx(tx_ring, - (MAX_SKB_FRAGS * + ((MAX_SKB_FRAGS + 1) * DIV_ROUND_UP(PAGE_SIZE, - adapter->tx_fifo_limit) + 2)); + adapter->tx_fifo_limit) + 4)); if (!netdev_xmit_more() || netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) { diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c index 4e32432878053..813889604ff86 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c +++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c @@ -4364,11 +4364,7 @@ static int i40e_check_fdir_input_set(struct i40e_vsi *vsi, return -EOPNOTSUPP; /* First 4 bytes of L4 header */ - if (usr_ip4_spec->l4_4_bytes == htonl(0xFFFFFFFF)) - new_mask |= I40E_L4_SRC_MASK | I40E_L4_DST_MASK; - else if (!usr_ip4_spec->l4_4_bytes) - new_mask &= ~(I40E_L4_SRC_MASK | I40E_L4_DST_MASK); - else + if (usr_ip4_spec->l4_4_bytes) return -EOPNOTSUPP; /* Filtering on Type of Service is not supported. */ @@ -4407,11 +4403,7 @@ static int i40e_check_fdir_input_set(struct i40e_vsi *vsi, else return -EOPNOTSUPP; - if (usr_ip6_spec->l4_4_bytes == htonl(0xFFFFFFFF)) - new_mask |= I40E_L4_SRC_MASK | I40E_L4_DST_MASK; - else if (!usr_ip6_spec->l4_4_bytes) - new_mask &= ~(I40E_L4_SRC_MASK | I40E_L4_DST_MASK); - else + if (usr_ip6_spec->l4_4_bytes) return -EOPNOTSUPP; /* Filtering on Traffic class is not supported. */ diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 19b5c56775843..ed2c961902b6c 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -10519,6 +10519,21 @@ static int i40e_rebuild_channels(struct i40e_vsi *vsi) return 0; } +/** + * i40e_clean_xps_state - clean xps state for every tx_ring + * @vsi: ptr to the VSI + **/ +static void i40e_clean_xps_state(struct i40e_vsi *vsi) +{ + int i; + + if (vsi->tx_rings) + for (i = 0; i < vsi->num_queue_pairs; i++) + if (vsi->tx_rings[i]) + clear_bit(__I40E_TX_XPS_INIT_DONE, + vsi->tx_rings[i]->state); +} + /** * i40e_prep_for_reset - prep for the core to reset * @pf: board private structure @@ -10543,8 +10558,10 @@ static void i40e_prep_for_reset(struct i40e_pf *pf) i40e_pf_quiesce_all_vsi(pf); for (v = 0; v < pf->num_alloc_vsi; v++) { - if (pf->vsi[v]) + if (pf->vsi[v]) { + i40e_clean_xps_state(pf->vsi[v]); pf->vsi[v]->seid = 0; + } } i40e_shutdown_adminq(&pf->hw); diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c index 8f350792e8230..7aedf20a10214 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c @@ -1578,6 +1578,7 @@ bool i40e_reset_vf(struct i40e_vf *vf, bool flr) i40e_cleanup_reset_vf(vf); i40e_flush(hw); + usleep_range(20000, 40000); clear_bit(I40E_VF_STATE_RESETTING, &vf->vf_states); return true; @@ -1701,6 +1702,7 @@ bool i40e_reset_all_vfs(struct i40e_pf *pf, bool flr) } i40e_flush(hw); + usleep_range(20000, 40000); clear_bit(__I40E_VF_DISABLE, pf->state); return true; diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c index 3cbb5a89b336f..e99e6e44b525a 100644 --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c @@ -1409,6 +1409,8 @@ static int igb_intr_test(struct igb_adapter *adapter, u64 *data) *data = 1; return -1; } + wr32(E1000_IVAR_MISC, E1000_IVAR_VALID << 8); + wr32(E1000_EIMS, BIT(0)); } else if (adapter->flags & IGB_FLAG_HAS_MSI) { shared_int = false; if (request_irq(irq, diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 9d460a2706012..5c431a3697622 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -4162,7 +4162,7 @@ static void mvneta_percpu_elect(struct mvneta_port *pp) /* Use the cpu associated to the rxq when it is online, in all * the other cases, use the cpu 0 which can't be offline. */ - if (cpu_online(pp->rxq_def)) + if (pp->rxq_def < nr_cpu_ids && cpu_online(pp->rxq_def)) elected_cpu = pp->rxq_def; max_cpu = num_present_cpus(); diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c index 75388a65f349e..a42373e6f2593 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c @@ -1090,7 +1090,12 @@ int otx2_init_tc(struct otx2_nic *nic) return err; tc->flow_ht_params = tc_flow_ht_params; - return rhashtable_init(&tc->flow_table, &tc->flow_ht_params); + err = rhashtable_init(&tc->flow_table, &tc->flow_ht_params); + if (err) { + kfree(tc->tc_entries_bitmap); + tc->tc_entries_bitmap = NULL; + } + return err; } void otx2_shutdown_tc(struct otx2_nic *nic) diff --git a/drivers/net/ethernet/microchip/encx24j600-regmap.c b/drivers/net/ethernet/microchip/encx24j600-regmap.c index 81a8ccca7e5e0..5693784eec5bc 100644 --- a/drivers/net/ethernet/microchip/encx24j600-regmap.c +++ b/drivers/net/ethernet/microchip/encx24j600-regmap.c @@ -359,7 +359,7 @@ static int regmap_encx24j600_phy_reg_read(void *context, unsigned int reg, goto err_out; usleep_range(26, 100); - while ((ret = regmap_read(ctx->regmap, MISTAT, &mistat) != 0) && + while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) && (mistat & BUSY)) cpu_relax(); @@ -397,7 +397,7 @@ static int regmap_encx24j600_phy_reg_write(void *context, unsigned int reg, goto err_out; usleep_range(26, 100); - while ((ret = regmap_read(ctx->regmap, MISTAT, &mistat) != 0) && + while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) && (mistat & BUSY)) cpu_relax(); diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c index 435ac224e38ed..0463f20da17b3 100644 --- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c @@ -829,6 +829,8 @@ static int mchp_sparx5_probe(struct platform_device *pdev) cleanup_ports: sparx5_cleanup_ports(sparx5); + if (sparx5->mact_queue) + destroy_workqueue(sparx5->mact_queue); cleanup_config: kfree(configs); cleanup_pnode: @@ -852,6 +854,7 @@ static int mchp_sparx5_remove(struct platform_device *pdev) sparx5_cleanup_ports(sparx5); /* Unregister netdevs */ sparx5_unregister_notifier_blocks(sparx5); + destroy_workqueue(sparx5->mact_queue); return 0; } diff --git a/drivers/net/ethernet/microsoft/mana/gdma.h b/drivers/net/ethernet/microsoft/mana/gdma.h index 41ecd156e95f5..1038bdf28ec08 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma.h +++ b/drivers/net/ethernet/microsoft/mana/gdma.h @@ -488,7 +488,14 @@ enum { #define GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT BIT(0) -#define GDMA_DRV_CAP_FLAGS1 GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT +/* Advertise to the NIC firmware: the NAPI work_done variable race is fixed, + * so the driver is able to reliably support features like busy_poll. + */ +#define GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX BIT(2) + +#define GDMA_DRV_CAP_FLAGS1 \ + (GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \ + GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX) #define GDMA_DRV_CAP_FLAGS2 0 diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index 18dc64d7f412f..4b8c239932178 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1071,10 +1071,11 @@ static void mana_poll_rx_cq(struct mana_cq *cq) } } -static void mana_cq_handler(void *context, struct gdma_queue *gdma_queue) +static int mana_cq_handler(void *context, struct gdma_queue *gdma_queue) { struct mana_cq *cq = context; u8 arm_bit; + int w; WARN_ON_ONCE(cq->gdma_cq != gdma_queue); @@ -1083,26 +1084,31 @@ static void mana_cq_handler(void *context, struct gdma_queue *gdma_queue) else mana_poll_tx_cq(cq); - if (cq->work_done < cq->budget && - napi_complete_done(&cq->napi, cq->work_done)) { + w = cq->work_done; + + if (w < cq->budget && + napi_complete_done(&cq->napi, w)) { arm_bit = SET_ARM_BIT; } else { arm_bit = 0; } mana_gd_ring_cq(gdma_queue, arm_bit); + + return w; } static int mana_poll(struct napi_struct *napi, int budget) { struct mana_cq *cq = container_of(napi, struct mana_cq, napi); + int w; cq->work_done = 0; cq->budget = budget; - mana_cq_handler(cq, cq->gdma_cq); + w = mana_cq_handler(cq, cq->gdma_cq); - return min(cq->work_done, budget); + return min(w, budget); } static void mana_schedule_napi(void *context, struct gdma_queue *gdma_queue) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index 9f5cac4000da6..5c234a8158c71 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -108,10 +108,10 @@ static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev) axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en"); axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm"); - axi->axi_kbbe = of_property_read_bool(np, "snps,axi_kbbe"); - axi->axi_fb = of_property_read_bool(np, "snps,axi_fb"); - axi->axi_mb = of_property_read_bool(np, "snps,axi_mb"); - axi->axi_rb = of_property_read_bool(np, "snps,axi_rb"); + axi->axi_kbbe = of_property_read_bool(np, "snps,kbbe"); + axi->axi_fb = of_property_read_bool(np, "snps,fb"); + axi->axi_mb = of_property_read_bool(np, "snps,mb"); + axi->axi_rb = of_property_read_bool(np, "snps,rb"); if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt)) axi->axi_wr_osr_lmt = 1; diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c index 96592a20c61ff..0362917fce7a9 100644 --- a/drivers/net/ieee802154/ca8210.c +++ b/drivers/net/ieee802154/ca8210.c @@ -927,7 +927,7 @@ static int ca8210_spi_transfer( dev_dbg(&spi->dev, "%s called\n", __func__); - cas_ctl = kmalloc(sizeof(*cas_ctl), GFP_ATOMIC); + cas_ctl = kzalloc(sizeof(*cas_ctl), GFP_ATOMIC); if (!cas_ctl) return -ENOMEM; diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c index 4517517215f2b..a8369bfa4050b 100644 --- a/drivers/net/ieee802154/cc2520.c +++ b/drivers/net/ieee802154/cc2520.c @@ -970,7 +970,7 @@ static int cc2520_hw_init(struct cc2520_private *priv) if (timeout-- <= 0) { dev_err(&priv->spi->dev, "oscillator start failed!\n"); - return ret; + return -ETIMEDOUT; } udelay(1); } while (!(status & CC2520_STATUS_XOSC32M_STABLE)); diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index aa9d0dfeda5ab..88e44eb392851 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -3675,6 +3675,7 @@ static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, + [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 }, }; static void macsec_free_netdev(struct net_device *dev) diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c index 40e745a1d1854..2c47efdae73b4 100644 --- a/drivers/net/mdio/fwnode_mdio.c +++ b/drivers/net/mdio/fwnode_mdio.c @@ -77,6 +77,7 @@ int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio, */ rc = phy_device_register(phy); if (rc) { + device_set_node(&phy->mdio.dev, NULL); fwnode_handle_put(child); return rc; } @@ -110,8 +111,8 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus, else phy = phy_device_create(bus, addr, phy_id, 0, NULL); if (IS_ERR(phy)) { - unregister_mii_timestamper(mii_ts); - return PTR_ERR(phy); + rc = PTR_ERR(phy); + goto clean_mii_ts; } if (is_acpi_node(child)) { @@ -125,17 +126,14 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus, /* All data is now stored in the phy struct, so register it */ rc = phy_device_register(phy); if (rc) { - phy_device_free(phy); - fwnode_handle_put(phy->mdio.dev.fwnode); - return rc; + phy->mdio.dev.fwnode = NULL; + fwnode_handle_put(child); + goto clean_phy; } } else if (is_of_node(child)) { rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr); - if (rc) { - unregister_mii_timestamper(mii_ts); - phy_device_free(phy); - return rc; - } + if (rc) + goto clean_phy; } /* phy->mii_ts may already be defined by the PHY driver. A @@ -145,5 +143,12 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus, if (mii_ts) phy->mii_ts = mii_ts; return 0; + +clean_phy: + phy_device_free(phy); +clean_mii_ts: + unregister_mii_timestamper(mii_ts); + + return rc; } EXPORT_SYMBOL(fwnode_mdiobus_register_phy); diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c index 796e9c7857d09..510822d6d0d90 100644 --- a/drivers/net/mdio/of_mdio.c +++ b/drivers/net/mdio/of_mdio.c @@ -68,8 +68,9 @@ static int of_mdiobus_register_device(struct mii_bus *mdio, /* All data is now stored in the mdiodev struct; register it. */ rc = mdio_device_register(mdiodev); if (rc) { + device_set_node(&mdiodev->dev, NULL); + fwnode_handle_put(fwnode); mdio_device_free(mdiodev); - of_node_put(child); return rc; } diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c index 250742ffdfd91..044828d081d22 100644 --- a/drivers/net/phy/mdio_device.c +++ b/drivers/net/phy/mdio_device.c @@ -21,6 +21,7 @@ #include #include #include +#include void mdio_device_free(struct mdio_device *mdiodev) { @@ -30,6 +31,7 @@ EXPORT_SYMBOL(mdio_device_free); static void mdio_device_release(struct device *dev) { + fwnode_handle_put(dev->fwnode); kfree(to_mdio_device(dev)); } diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c index 5ce1bf03bbd71..f9c70476d7e8c 100644 --- a/drivers/net/phy/mxl-gpy.c +++ b/drivers/net/phy/mxl-gpy.c @@ -96,6 +96,7 @@ static int gpy_config_init(struct phy_device *phydev) static int gpy_probe(struct phy_device *phydev) { + int fw_version; int ret; if (!phydev->is_c45) { @@ -105,12 +106,12 @@ static int gpy_probe(struct phy_device *phydev) } /* Show GPY PHY FW version in dmesg */ - ret = phy_read(phydev, PHY_FWV); - if (ret < 0) - return ret; + fw_version = phy_read(phydev, PHY_FWV); + if (fw_version < 0) + return fw_version; - phydev_info(phydev, "Firmware Version: 0x%04X (%s)\n", ret, - (ret & PHY_FWV_REL_MASK) ? "release" : "test"); + phydev_info(phydev, "Firmware Version: 0x%04X (%s)\n", fw_version, + (fw_version & PHY_FWV_REL_MASK) ? "release" : "test"); return 0; } diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c index 2a2cb9d453e8e..b1776116f9f7d 100644 --- a/drivers/net/plip/plip.c +++ b/drivers/net/plip/plip.c @@ -446,12 +446,12 @@ plip_bh_timeout_error(struct net_device *dev, struct net_local *nl, } rcv->state = PLIP_PK_DONE; if (rcv->skb) { - kfree_skb(rcv->skb); + dev_kfree_skb_irq(rcv->skb); rcv->skb = NULL; } snd->state = PLIP_PK_DONE; if (snd->skb) { - dev_kfree_skb(snd->skb); + dev_consume_skb_irq(snd->skb); snd->skb = NULL; } spin_unlock_irq(&nl->lock); diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c index 1291496402253..3395dcb0b262b 100644 --- a/drivers/net/thunderbolt.c +++ b/drivers/net/thunderbolt.c @@ -902,6 +902,7 @@ static int tbnet_open(struct net_device *dev) tbnet_start_poll, net); if (!ring) { netdev_err(dev, "failed to allocate Rx ring\n"); + tb_xdomain_release_out_hopid(xd, hopid); tb_ring_free(net->tx_ring.ring); net->tx_ring.ring = NULL; return -ENOMEM; diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index d886f903e4285..7b358b896a6d7 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -1413,6 +1413,7 @@ static const struct usb_device_id products[] = { {QMI_FIXED_INTF(0x0489, 0xe0b4, 0)}, /* Foxconn T77W968 LTE */ {QMI_FIXED_INTF(0x0489, 0xe0b5, 0)}, /* Foxconn T77W968 LTE with eSIM support*/ {QMI_FIXED_INTF(0x2692, 0x9025, 4)}, /* Cellient MPL200 (rebranded Qualcomm 05c6:9025) */ + {QMI_QUIRK_SET_DTR(0x1546, 0x1342, 4)}, /* u-blox LARA-L6 */ /* 4. Gobi 1000 devices */ {QMI_GOBI1K_DEVICE(0x05c6, 0x9212)}, /* Acer Gobi Modem Device */ diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index bc3192cf48e3e..21896e2213004 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -75,8 +75,14 @@ vmxnet3_enable_all_intrs(struct vmxnet3_adapter *adapter) for (i = 0; i < adapter->intr.num_intrs; i++) vmxnet3_enable_intr(adapter, i); - adapter->shared->devRead.intrConf.intrCtrl &= + if (!VMXNET3_VERSION_GE_6(adapter) || + !adapter->queuesExtEnabled) { + adapter->shared->devRead.intrConf.intrCtrl &= + cpu_to_le32(~VMXNET3_IC_DISABLE_ALL); + } else { + adapter->shared->devReadExt.intrConfExt.intrCtrl &= cpu_to_le32(~VMXNET3_IC_DISABLE_ALL); + } } @@ -85,8 +91,14 @@ vmxnet3_disable_all_intrs(struct vmxnet3_adapter *adapter) { int i; - adapter->shared->devRead.intrConf.intrCtrl |= + if (!VMXNET3_VERSION_GE_6(adapter) || + !adapter->queuesExtEnabled) { + adapter->shared->devRead.intrConf.intrCtrl |= + cpu_to_le32(VMXNET3_IC_DISABLE_ALL); + } else { + adapter->shared->devReadExt.intrConfExt.intrCtrl |= cpu_to_le32(VMXNET3_IC_DISABLE_ALL); + } for (i = 0; i < adapter->intr.num_intrs; i++) vmxnet3_disable_intr(adapter, i); } @@ -1350,6 +1362,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq, }; u32 num_pkts = 0; bool skip_page_frags = false; + bool encap_lro = false; struct Vmxnet3_RxCompDesc *rcd; struct vmxnet3_rx_ctx *ctx = &rq->rx_ctx; u16 segCnt = 0, mss = 0; @@ -1508,13 +1521,18 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq, if (VMXNET3_VERSION_GE_2(adapter) && rcd->type == VMXNET3_CDTYPE_RXCOMP_LRO) { struct Vmxnet3_RxCompDescExt *rcdlro; + union Vmxnet3_GenericDesc *gdesc; + rcdlro = (struct Vmxnet3_RxCompDescExt *)rcd; + gdesc = (union Vmxnet3_GenericDesc *)rcd; segCnt = rcdlro->segCnt; WARN_ON_ONCE(segCnt == 0); mss = rcdlro->mss; if (unlikely(segCnt <= 1)) segCnt = 0; + encap_lro = (le32_to_cpu(gdesc->dword[0]) & + (1UL << VMXNET3_RCD_HDR_INNER_SHIFT)); } else { segCnt = 0; } @@ -1582,7 +1600,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq, vmxnet3_rx_csum(adapter, skb, (union Vmxnet3_GenericDesc *)rcd); skb->protocol = eth_type_trans(skb, adapter->netdev); - if (!rcd->tcp || + if ((!rcd->tcp && !encap_lro) || !(adapter->netdev->features & NETIF_F_LRO)) goto not_lro; @@ -1591,7 +1609,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq, SKB_GSO_TCPV4 : SKB_GSO_TCPV6; skb_shinfo(skb)->gso_size = mss; skb_shinfo(skb)->gso_segs = segCnt; - } else if (segCnt != 0 || skb->len > mtu) { + } else if ((segCnt != 0 || skb->len > mtu) && !encap_lro) { u32 hlen; hlen = vmxnet3_get_hdr_len(adapter, skb, @@ -1620,6 +1638,7 @@ not_lro: napi_gro_receive(&rq->napi, skb); ctx->skb = NULL; + encap_lro = false; num_pkts++; } diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h index d9dea4829c86e..adfd21aa5b6ad 100644 --- a/drivers/net/xen-netback/common.h +++ b/drivers/net/xen-netback/common.h @@ -48,7 +48,6 @@ #include typedef unsigned int pending_ring_idx_t; -#define INVALID_PENDING_RING_IDX (~0U) struct pending_tx_info { struct xen_netif_tx_request req; /* tx request */ @@ -82,8 +81,6 @@ struct xenvif_rx_meta { /* Discriminate from any valid pending_idx value. */ #define INVALID_PENDING_IDX 0xFFFF -#define MAX_BUFFER_OFFSET XEN_PAGE_SIZE - #define MAX_PENDING_REQS XEN_NETIF_TX_RING_SIZE /* The maximum number of frags is derived from the size of a grant (same @@ -367,11 +364,6 @@ void xenvif_free(struct xenvif *vif); int xenvif_xenbus_init(void); void xenvif_xenbus_fini(void); -int xenvif_schedulable(struct xenvif *vif); - -int xenvif_queue_stopped(struct xenvif_queue *queue); -void xenvif_wake_queue(struct xenvif_queue *queue); - /* (Un)Map communication rings. */ void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue); int xenvif_map_frontend_data_rings(struct xenvif_queue *queue, @@ -394,8 +386,7 @@ int xenvif_dealloc_kthread(void *data); irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data); bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread); -void xenvif_rx_action(struct xenvif_queue *queue); -void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb); +bool xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb); void xenvif_carrier_on(struct xenvif *vif); @@ -403,9 +394,6 @@ void xenvif_carrier_on(struct xenvif *vif); void xenvif_zerocopy_callback(struct sk_buff *skb, struct ubuf_info *ubuf, bool zerocopy_success); -/* Unmap a pending page and release it back to the guest */ -void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx); - static inline pending_ring_idx_t nr_pending_reqs(struct xenvif_queue *queue) { return MAX_PENDING_REQS - diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c index c58996c1e2309..e1a5610b1747e 100644 --- a/drivers/net/xen-netback/interface.c +++ b/drivers/net/xen-netback/interface.c @@ -70,7 +70,7 @@ void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue) wake_up(&queue->dealloc_wq); } -int xenvif_schedulable(struct xenvif *vif) +static int xenvif_schedulable(struct xenvif *vif) { return netif_running(vif->dev) && test_bit(VIF_STATUS_CONNECTED, &vif->status) && @@ -178,20 +178,6 @@ irqreturn_t xenvif_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -int xenvif_queue_stopped(struct xenvif_queue *queue) -{ - struct net_device *dev = queue->vif->dev; - unsigned int id = queue->id; - return netif_tx_queue_stopped(netdev_get_tx_queue(dev, id)); -} - -void xenvif_wake_queue(struct xenvif_queue *queue) -{ - struct net_device *dev = queue->vif->dev; - unsigned int id = queue->id; - netif_tx_wake_queue(netdev_get_tx_queue(dev, id)); -} - static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb, struct net_device *sb_dev) { @@ -269,14 +255,16 @@ xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev) if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) skb_clear_hash(skb); - xenvif_rx_queue_tail(queue, skb); + if (!xenvif_rx_queue_tail(queue, skb)) + goto drop; + xenvif_kick_thread(queue); return NETDEV_TX_OK; drop: vif->dev->stats.tx_dropped++; - dev_kfree_skb(skb); + dev_kfree_skb_any(skb); return NETDEV_TX_OK; } diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 32d5bc4919d8c..26428db845bea 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -112,6 +112,8 @@ static void make_tx_response(struct xenvif_queue *queue, s8 st); static void push_tx_responses(struct xenvif_queue *queue); +static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx); + static inline int tx_work_todo(struct xenvif_queue *queue); static inline unsigned long idx_to_pfn(struct xenvif_queue *queue, @@ -330,10 +332,13 @@ static int xenvif_count_requests(struct xenvif_queue *queue, struct xenvif_tx_cb { - u16 pending_idx; + u16 copy_pending_idx[XEN_NETBK_LEGACY_SLOTS_MAX + 1]; + u8 copy_count; }; #define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb) +#define copy_pending_idx(skb, i) (XENVIF_TX_CB(skb)->copy_pending_idx[i]) +#define copy_count(skb) (XENVIF_TX_CB(skb)->copy_count) static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue, u16 pending_idx, @@ -368,31 +373,93 @@ static inline struct sk_buff *xenvif_alloc_skb(unsigned int size) return skb; } -static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *queue, - struct sk_buff *skb, - struct xen_netif_tx_request *txp, - struct gnttab_map_grant_ref *gop, - unsigned int frag_overflow, - struct sk_buff *nskb) +static void xenvif_get_requests(struct xenvif_queue *queue, + struct sk_buff *skb, + struct xen_netif_tx_request *first, + struct xen_netif_tx_request *txfrags, + unsigned *copy_ops, + unsigned *map_ops, + unsigned int frag_overflow, + struct sk_buff *nskb, + unsigned int extra_count, + unsigned int data_len) { struct skb_shared_info *shinfo = skb_shinfo(skb); skb_frag_t *frags = shinfo->frags; - u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; - int start; + u16 pending_idx; pending_ring_idx_t index; unsigned int nr_slots; + struct gnttab_copy *cop = queue->tx_copy_ops + *copy_ops; + struct gnttab_map_grant_ref *gop = queue->tx_map_ops + *map_ops; + struct xen_netif_tx_request *txp = first; + + nr_slots = shinfo->nr_frags + 1; + + copy_count(skb) = 0; - nr_slots = shinfo->nr_frags; + /* Create copy ops for exactly data_len bytes into the skb head. */ + __skb_put(skb, data_len); + while (data_len > 0) { + int amount = data_len > txp->size ? txp->size : data_len; - /* Skip first skb fragment if it is on same page as header fragment. */ - start = (frag_get_pending_idx(&shinfo->frags[0]) == pending_idx); + cop->source.u.ref = txp->gref; + cop->source.domid = queue->vif->domid; + cop->source.offset = txp->offset; - for (shinfo->nr_frags = start; shinfo->nr_frags < nr_slots; - shinfo->nr_frags++, txp++, gop++) { + cop->dest.domid = DOMID_SELF; + cop->dest.offset = (offset_in_page(skb->data + + skb_headlen(skb) - + data_len)) & ~XEN_PAGE_MASK; + cop->dest.u.gmfn = virt_to_gfn(skb->data + skb_headlen(skb) + - data_len); + + cop->len = amount; + cop->flags = GNTCOPY_source_gref; + + index = pending_index(queue->pending_cons); + pending_idx = queue->pending_ring[index]; + callback_param(queue, pending_idx).ctx = NULL; + copy_pending_idx(skb, copy_count(skb)) = pending_idx; + copy_count(skb)++; + + cop++; + data_len -= amount; + + if (amount == txp->size) { + /* The copy op covered the full tx_request */ + + memcpy(&queue->pending_tx_info[pending_idx].req, + txp, sizeof(*txp)); + queue->pending_tx_info[pending_idx].extra_count = + (txp == first) ? extra_count : 0; + + if (txp == first) + txp = txfrags; + else + txp++; + queue->pending_cons++; + nr_slots--; + } else { + /* The copy op partially covered the tx_request. + * The remainder will be mapped. + */ + txp->offset += amount; + txp->size -= amount; + } + } + + for (shinfo->nr_frags = 0; shinfo->nr_frags < nr_slots; + shinfo->nr_frags++, gop++) { index = pending_index(queue->pending_cons++); pending_idx = queue->pending_ring[index]; - xenvif_tx_create_map_op(queue, pending_idx, txp, 0, gop); + xenvif_tx_create_map_op(queue, pending_idx, txp, + txp == first ? extra_count : 0, gop); frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx); + + if (txp == first) + txp = txfrags; + else + txp++; } if (frag_overflow) { @@ -413,7 +480,8 @@ static struct gnttab_map_grant_ref *xenvif_get_requests(struct xenvif_queue *que skb_shinfo(skb)->frag_list = nskb; } - return gop; + (*copy_ops) = cop - queue->tx_copy_ops; + (*map_ops) = gop - queue->tx_map_ops; } static inline void xenvif_grant_handle_set(struct xenvif_queue *queue, @@ -449,7 +517,7 @@ static int xenvif_tx_check_gop(struct xenvif_queue *queue, struct gnttab_copy **gopp_copy) { struct gnttab_map_grant_ref *gop_map = *gopp_map; - u16 pending_idx = XENVIF_TX_CB(skb)->pending_idx; + u16 pending_idx; /* This always points to the shinfo of the skb being checked, which * could be either the first or the one on the frag_list */ @@ -460,24 +528,37 @@ static int xenvif_tx_check_gop(struct xenvif_queue *queue, struct skb_shared_info *first_shinfo = NULL; int nr_frags = shinfo->nr_frags; const bool sharedslot = nr_frags && - frag_get_pending_idx(&shinfo->frags[0]) == pending_idx; - int i, err; + frag_get_pending_idx(&shinfo->frags[0]) == + copy_pending_idx(skb, copy_count(skb) - 1); + int i, err = 0; - /* Check status of header. */ - err = (*gopp_copy)->status; - if (unlikely(err)) { - if (net_ratelimit()) - netdev_dbg(queue->vif->dev, - "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", - (*gopp_copy)->status, - pending_idx, - (*gopp_copy)->source.u.ref); - /* The first frag might still have this slot mapped */ - if (!sharedslot) - xenvif_idx_release(queue, pending_idx, - XEN_NETIF_RSP_ERROR); + for (i = 0; i < copy_count(skb); i++) { + int newerr; + + /* Check status of header. */ + pending_idx = copy_pending_idx(skb, i); + + newerr = (*gopp_copy)->status; + if (likely(!newerr)) { + /* The first frag might still have this slot mapped */ + if (i < copy_count(skb) - 1 || !sharedslot) + xenvif_idx_release(queue, pending_idx, + XEN_NETIF_RSP_OKAY); + } else { + err = newerr; + if (net_ratelimit()) + netdev_dbg(queue->vif->dev, + "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", + (*gopp_copy)->status, + pending_idx, + (*gopp_copy)->source.u.ref); + /* The first frag might still have this slot mapped */ + if (i < copy_count(skb) - 1 || !sharedslot) + xenvif_idx_release(queue, pending_idx, + XEN_NETIF_RSP_ERROR); + } + (*gopp_copy)++; } - (*gopp_copy)++; check_frags: for (i = 0; i < nr_frags; i++, gop_map++) { @@ -524,14 +605,6 @@ check_frags: if (err) continue; - /* First error: if the header haven't shared a slot with the - * first frag, release it as well. - */ - if (!sharedslot) - xenvif_idx_release(queue, - XENVIF_TX_CB(skb)->pending_idx, - XEN_NETIF_RSP_OKAY); - /* Invalidate preceding fragments of this skb. */ for (j = 0; j < i; j++) { pending_idx = frag_get_pending_idx(&shinfo->frags[j]); @@ -801,7 +874,6 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, unsigned *copy_ops, unsigned *map_ops) { - struct gnttab_map_grant_ref *gop = queue->tx_map_ops; struct sk_buff *skb, *nskb; int ret; unsigned int frag_overflow; @@ -883,8 +955,12 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, continue; } + data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN) ? + XEN_NETBACK_TX_COPY_LEN : txreq.size; + ret = xenvif_count_requests(queue, &txreq, extra_count, txfrags, work_to_do); + if (unlikely(ret < 0)) break; @@ -910,9 +986,8 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, index = pending_index(queue->pending_cons); pending_idx = queue->pending_ring[index]; - data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN && - ret < XEN_NETBK_LEGACY_SLOTS_MAX) ? - XEN_NETBACK_TX_COPY_LEN : txreq.size; + if (ret >= XEN_NETBK_LEGACY_SLOTS_MAX - 1 && data_len < txreq.size) + data_len = txreq.size; skb = xenvif_alloc_skb(data_len); if (unlikely(skb == NULL)) { @@ -923,8 +998,6 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, } skb_shinfo(skb)->nr_frags = ret; - if (data_len < txreq.size) - skb_shinfo(skb)->nr_frags++; /* At this point shinfo->nr_frags is in fact the number of * slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX. */ @@ -986,54 +1059,19 @@ static void xenvif_tx_build_gops(struct xenvif_queue *queue, type); } - XENVIF_TX_CB(skb)->pending_idx = pending_idx; - - __skb_put(skb, data_len); - queue->tx_copy_ops[*copy_ops].source.u.ref = txreq.gref; - queue->tx_copy_ops[*copy_ops].source.domid = queue->vif->domid; - queue->tx_copy_ops[*copy_ops].source.offset = txreq.offset; - - queue->tx_copy_ops[*copy_ops].dest.u.gmfn = - virt_to_gfn(skb->data); - queue->tx_copy_ops[*copy_ops].dest.domid = DOMID_SELF; - queue->tx_copy_ops[*copy_ops].dest.offset = - offset_in_page(skb->data) & ~XEN_PAGE_MASK; - - queue->tx_copy_ops[*copy_ops].len = data_len; - queue->tx_copy_ops[*copy_ops].flags = GNTCOPY_source_gref; - - (*copy_ops)++; - - if (data_len < txreq.size) { - frag_set_pending_idx(&skb_shinfo(skb)->frags[0], - pending_idx); - xenvif_tx_create_map_op(queue, pending_idx, &txreq, - extra_count, gop); - gop++; - } else { - frag_set_pending_idx(&skb_shinfo(skb)->frags[0], - INVALID_PENDING_IDX); - memcpy(&queue->pending_tx_info[pending_idx].req, - &txreq, sizeof(txreq)); - queue->pending_tx_info[pending_idx].extra_count = - extra_count; - } - - queue->pending_cons++; - - gop = xenvif_get_requests(queue, skb, txfrags, gop, - frag_overflow, nskb); + xenvif_get_requests(queue, skb, &txreq, txfrags, copy_ops, + map_ops, frag_overflow, nskb, extra_count, + data_len); __skb_queue_tail(&queue->tx_queue, skb); queue->tx.req_cons = idx; - if (((gop-queue->tx_map_ops) >= ARRAY_SIZE(queue->tx_map_ops)) || + if ((*map_ops >= ARRAY_SIZE(queue->tx_map_ops)) || (*copy_ops >= ARRAY_SIZE(queue->tx_copy_ops))) break; } - (*map_ops) = gop - queue->tx_map_ops; return; } @@ -1112,9 +1150,8 @@ static int xenvif_tx_submit(struct xenvif_queue *queue) while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) { struct xen_netif_tx_request *txp; u16 pending_idx; - unsigned data_len; - pending_idx = XENVIF_TX_CB(skb)->pending_idx; + pending_idx = copy_pending_idx(skb, 0); txp = &queue->pending_tx_info[pending_idx].req; /* Check the remap error code. */ @@ -1133,18 +1170,6 @@ static int xenvif_tx_submit(struct xenvif_queue *queue) continue; } - data_len = skb->len; - callback_param(queue, pending_idx).ctx = NULL; - if (data_len < txp->size) { - /* Append the packet payload as a fragment. */ - txp->offset += data_len; - txp->size -= data_len; - } else { - /* Schedule a response immediately. */ - xenvif_idx_release(queue, pending_idx, - XEN_NETIF_RSP_OKAY); - } - if (txp->flags & XEN_NETTXF_csum_blank) skb->ip_summed = CHECKSUM_PARTIAL; else if (txp->flags & XEN_NETTXF_data_validated) @@ -1331,7 +1356,7 @@ static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue) /* Called after netfront has transmitted */ int xenvif_tx_action(struct xenvif_queue *queue, int budget) { - unsigned nr_mops, nr_cops = 0; + unsigned nr_mops = 0, nr_cops = 0; int work_done, ret; if (unlikely(!tx_work_todo(queue))) @@ -1418,7 +1443,7 @@ static void push_tx_responses(struct xenvif_queue *queue) notify_remote_via_irq(queue->tx_irq); } -void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) +static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) { int ret; struct gnttab_unmap_grant_ref tx_unmap_op; diff --git a/drivers/net/xen-netback/rx.c b/drivers/net/xen-netback/rx.c index a0335407be423..0ba754ebc5baa 100644 --- a/drivers/net/xen-netback/rx.c +++ b/drivers/net/xen-netback/rx.c @@ -82,9 +82,10 @@ static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue) return false; } -void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb) +bool xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb) { unsigned long flags; + bool ret = true; spin_lock_irqsave(&queue->rx_queue.lock, flags); @@ -92,8 +93,7 @@ void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb) struct net_device *dev = queue->vif->dev; netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); - kfree_skb(skb); - queue->vif->dev->stats.rx_dropped++; + ret = false; } else { if (skb_queue_empty(&queue->rx_queue)) xenvif_update_needed_slots(queue, skb); @@ -104,6 +104,8 @@ void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb) } spin_unlock_irqrestore(&queue->rx_queue.lock, flags); + + return ret; } static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue) @@ -486,7 +488,7 @@ static void xenvif_rx_skb(struct xenvif_queue *queue) #define RX_BATCH_SIZE 64 -void xenvif_rx_action(struct xenvif_queue *queue) +static void xenvif_rx_action(struct xenvif_queue *queue) { struct sk_buff_head completed_skbs; unsigned int work_done = 0; diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 074dceb1930b3..6e73d3a00eecd 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -1866,6 +1866,12 @@ static int netfront_resume(struct xenbus_device *dev) netif_tx_unlock_bh(info->netdev); xennet_disconnect_backend(info); + + rtnl_lock(); + if (info->queues) + xennet_destroy_queues(info); + rtnl_unlock(); + return 0; } diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 694373951b18a..692ee0f4a1ec3 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2921,10 +2921,6 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl) if (!ctrl->identified) { unsigned int i; - ret = nvme_init_subsystem(ctrl, id); - if (ret) - goto out_free; - /* * Check for quirks. Quirk can depend on firmware version, * so, in principle, the set of quirks present can change @@ -2937,6 +2933,10 @@ static int nvme_init_identify(struct nvme_ctrl *ctrl) if (quirk_matches(id, &core_quirks[i])) ctrl->quirks |= core_quirks[i].quirks; } + + ret = nvme_init_subsystem(ctrl, id); + if (ret) + goto out_free; } memcpy(ctrl->subsys->firmware_rev, id->fr, sizeof(ctrl->subsys->firmware_rev)); diff --git a/drivers/regulator/slg51000-regulator.c b/drivers/regulator/slg51000-regulator.c index 75a941fb3c2bd..1b2eee95ad3f9 100644 --- a/drivers/regulator/slg51000-regulator.c +++ b/drivers/regulator/slg51000-regulator.c @@ -457,6 +457,8 @@ static int slg51000_i2c_probe(struct i2c_client *client) chip->cs_gpiod = cs_gpiod; } + usleep_range(10000, 11000); + i2c_set_clientdata(client, chip); chip->chip_irq = client->irq; chip->dev = dev; diff --git a/drivers/regulator/twl6030-regulator.c b/drivers/regulator/twl6030-regulator.c index 7c7e3648ea4bf..f3856750944f4 100644 --- a/drivers/regulator/twl6030-regulator.c +++ b/drivers/regulator/twl6030-regulator.c @@ -67,6 +67,7 @@ struct twlreg_info { #define TWL6030_CFG_STATE_SLEEP 0x03 #define TWL6030_CFG_STATE_GRP_SHIFT 5 #define TWL6030_CFG_STATE_APP_SHIFT 2 +#define TWL6030_CFG_STATE_MASK 0x03 #define TWL6030_CFG_STATE_APP_MASK (0x03 << TWL6030_CFG_STATE_APP_SHIFT) #define TWL6030_CFG_STATE_APP(v) (((v) & TWL6030_CFG_STATE_APP_MASK) >>\ TWL6030_CFG_STATE_APP_SHIFT) @@ -128,13 +129,14 @@ static int twl6030reg_is_enabled(struct regulator_dev *rdev) if (grp < 0) return grp; grp &= P1_GRP_6030; + val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE); + val = TWL6030_CFG_STATE_APP(val); } else { + val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE); + val &= TWL6030_CFG_STATE_MASK; grp = 1; } - val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE); - val = TWL6030_CFG_STATE_APP(val); - return grp && (val == TWL6030_CFG_STATE_ON); } @@ -187,7 +189,12 @@ static int twl6030reg_get_status(struct regulator_dev *rdev) val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE); - switch (TWL6030_CFG_STATE_APP(val)) { + if (info->features & TWL6032_SUBCLASS) + val &= TWL6030_CFG_STATE_MASK; + else + val = TWL6030_CFG_STATE_APP(val); + + switch (val) { case TWL6030_CFG_STATE_ON: return REGULATOR_STATUS_NORMAL; diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index b90a603d6b12f..7c006c2b125f8 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -249,10 +249,46 @@ static int cmos_set_time(struct device *dev, struct rtc_time *t) return mc146818_set_time(t); } +struct cmos_read_alarm_callback_param { + struct cmos_rtc *cmos; + struct rtc_time *time; + unsigned char rtc_control; +}; + +static void cmos_read_alarm_callback(unsigned char __always_unused seconds, + void *param_in) +{ + struct cmos_read_alarm_callback_param *p = + (struct cmos_read_alarm_callback_param *)param_in; + struct rtc_time *time = p->time; + + time->tm_sec = CMOS_READ(RTC_SECONDS_ALARM); + time->tm_min = CMOS_READ(RTC_MINUTES_ALARM); + time->tm_hour = CMOS_READ(RTC_HOURS_ALARM); + + if (p->cmos->day_alrm) { + /* ignore upper bits on readback per ACPI spec */ + time->tm_mday = CMOS_READ(p->cmos->day_alrm) & 0x3f; + if (!time->tm_mday) + time->tm_mday = -1; + + if (p->cmos->mon_alrm) { + time->tm_mon = CMOS_READ(p->cmos->mon_alrm); + if (!time->tm_mon) + time->tm_mon = -1; + } + } + + p->rtc_control = CMOS_READ(RTC_CONTROL); +} + static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct cmos_rtc *cmos = dev_get_drvdata(dev); - unsigned char rtc_control; + struct cmos_read_alarm_callback_param p = { + .cmos = cmos, + .time = &t->time, + }; /* This not only a rtc_op, but also called directly */ if (!is_valid_irq(cmos->irq)) @@ -263,28 +299,18 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) * the future. */ - spin_lock_irq(&rtc_lock); - t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM); - t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM); - t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM); - - if (cmos->day_alrm) { - /* ignore upper bits on readback per ACPI spec */ - t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f; - if (!t->time.tm_mday) - t->time.tm_mday = -1; - - if (cmos->mon_alrm) { - t->time.tm_mon = CMOS_READ(cmos->mon_alrm); - if (!t->time.tm_mon) - t->time.tm_mon = -1; - } - } - - rtc_control = CMOS_READ(RTC_CONTROL); - spin_unlock_irq(&rtc_lock); + /* Some Intel chipsets disconnect the alarm registers when the clock + * update is in progress - during this time reads return bogus values + * and writes may fail silently. See for example "7th Generation Intel® + * Processor Family I/O for U/Y Platforms [...] Datasheet", section + * 27.7.1 + * + * Use the mc146818_avoid_UIP() function to avoid this. + */ + if (!mc146818_avoid_UIP(cmos_read_alarm_callback, &p)) + return -EIO; - if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { + if (!(p.rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { if (((unsigned)t->time.tm_sec) < 0x60) t->time.tm_sec = bcd2bin(t->time.tm_sec); else @@ -313,7 +339,7 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) } } - t->enabled = !!(rtc_control & RTC_AIE); + t->enabled = !!(p.rtc_control & RTC_AIE); t->pending = 0; return 0; @@ -444,10 +470,57 @@ static int cmos_validate_alarm(struct device *dev, struct rtc_wkalrm *t) return 0; } +struct cmos_set_alarm_callback_param { + struct cmos_rtc *cmos; + unsigned char mon, mday, hrs, min, sec; + struct rtc_wkalrm *t; +}; + +/* Note: this function may be executed by mc146818_avoid_UIP() more then + * once + */ +static void cmos_set_alarm_callback(unsigned char __always_unused seconds, + void *param_in) +{ + struct cmos_set_alarm_callback_param *p = + (struct cmos_set_alarm_callback_param *)param_in; + + /* next rtc irq must not be from previous alarm setting */ + cmos_irq_disable(p->cmos, RTC_AIE); + + /* update alarm */ + CMOS_WRITE(p->hrs, RTC_HOURS_ALARM); + CMOS_WRITE(p->min, RTC_MINUTES_ALARM); + CMOS_WRITE(p->sec, RTC_SECONDS_ALARM); + + /* the system may support an "enhanced" alarm */ + if (p->cmos->day_alrm) { + CMOS_WRITE(p->mday, p->cmos->day_alrm); + if (p->cmos->mon_alrm) + CMOS_WRITE(p->mon, p->cmos->mon_alrm); + } + + if (use_hpet_alarm()) { + /* + * FIXME the HPET alarm glue currently ignores day_alrm + * and mon_alrm ... + */ + hpet_set_alarm_time(p->t->time.tm_hour, p->t->time.tm_min, + p->t->time.tm_sec); + } + + if (p->t->enabled) + cmos_irq_enable(p->cmos, RTC_AIE); +} + static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct cmos_rtc *cmos = dev_get_drvdata(dev); - unsigned char mon, mday, hrs, min, sec, rtc_control; + struct cmos_set_alarm_callback_param p = { + .cmos = cmos, + .t = t + }; + unsigned char rtc_control; int ret; /* This not only a rtc_op, but also called directly */ @@ -458,11 +531,11 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) if (ret < 0) return ret; - mon = t->time.tm_mon + 1; - mday = t->time.tm_mday; - hrs = t->time.tm_hour; - min = t->time.tm_min; - sec = t->time.tm_sec; + p.mon = t->time.tm_mon + 1; + p.mday = t->time.tm_mday; + p.hrs = t->time.tm_hour; + p.min = t->time.tm_min; + p.sec = t->time.tm_sec; spin_lock_irq(&rtc_lock); rtc_control = CMOS_READ(RTC_CONTROL); @@ -470,43 +543,21 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { /* Writing 0xff means "don't care" or "match all". */ - mon = (mon <= 12) ? bin2bcd(mon) : 0xff; - mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff; - hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff; - min = (min < 60) ? bin2bcd(min) : 0xff; - sec = (sec < 60) ? bin2bcd(sec) : 0xff; - } - - spin_lock_irq(&rtc_lock); - - /* next rtc irq must not be from previous alarm setting */ - cmos_irq_disable(cmos, RTC_AIE); - - /* update alarm */ - CMOS_WRITE(hrs, RTC_HOURS_ALARM); - CMOS_WRITE(min, RTC_MINUTES_ALARM); - CMOS_WRITE(sec, RTC_SECONDS_ALARM); - - /* the system may support an "enhanced" alarm */ - if (cmos->day_alrm) { - CMOS_WRITE(mday, cmos->day_alrm); - if (cmos->mon_alrm) - CMOS_WRITE(mon, cmos->mon_alrm); - } - - if (use_hpet_alarm()) { - /* - * FIXME the HPET alarm glue currently ignores day_alrm - * and mon_alrm ... - */ - hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, - t->time.tm_sec); + p.mon = (p.mon <= 12) ? bin2bcd(p.mon) : 0xff; + p.mday = (p.mday >= 1 && p.mday <= 31) ? bin2bcd(p.mday) : 0xff; + p.hrs = (p.hrs < 24) ? bin2bcd(p.hrs) : 0xff; + p.min = (p.min < 60) ? bin2bcd(p.min) : 0xff; + p.sec = (p.sec < 60) ? bin2bcd(p.sec) : 0xff; } - if (t->enabled) - cmos_irq_enable(cmos, RTC_AIE); - - spin_unlock_irq(&rtc_lock); + /* + * Some Intel chipsets disconnect the alarm registers when the clock + * update is in progress - during this time writes fail silently. + * + * Use mc146818_avoid_UIP() to avoid this. + */ + if (!mc146818_avoid_UIP(cmos_set_alarm_callback, &p)) + return -EIO; cmos->alarm_expires = rtc_tm_to_time64(&t->time); diff --git a/drivers/rtc/rtc-mc146818-lib.c b/drivers/rtc/rtc-mc146818-lib.c index f3f5a87fe376e..347655d24b5d3 100644 --- a/drivers/rtc/rtc-mc146818-lib.c +++ b/drivers/rtc/rtc-mc146818-lib.c @@ -8,6 +8,76 @@ #include #endif +/* + * Execute a function while the UIP (Update-in-progress) bit of the RTC is + * unset. + * + * Warning: callback may be executed more then once. + */ +bool mc146818_avoid_UIP(void (*callback)(unsigned char seconds, void *param), + void *param) +{ + int i; + unsigned long flags; + unsigned char seconds; + + for (i = 0; i < 10; i++) { + spin_lock_irqsave(&rtc_lock, flags); + + /* + * Check whether there is an update in progress during which the + * readout is unspecified. The maximum update time is ~2ms. Poll + * every msec for completion. + * + * Store the second value before checking UIP so a long lasting + * NMI which happens to hit after the UIP check cannot make + * an update cycle invisible. + */ + seconds = CMOS_READ(RTC_SECONDS); + + if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP) { + spin_unlock_irqrestore(&rtc_lock, flags); + mdelay(1); + continue; + } + + /* Revalidate the above readout */ + if (seconds != CMOS_READ(RTC_SECONDS)) { + spin_unlock_irqrestore(&rtc_lock, flags); + continue; + } + + if (callback) + callback(seconds, param); + + /* + * Check for the UIP bit again. If it is set now then + * the above values may contain garbage. + */ + if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP) { + spin_unlock_irqrestore(&rtc_lock, flags); + mdelay(1); + continue; + } + + /* + * A NMI might have interrupted the above sequence so check + * whether the seconds value has changed which indicates that + * the NMI took longer than the UIP bit was set. Unlikely, but + * possible and there is also virt... + */ + if (seconds != CMOS_READ(RTC_SECONDS)) { + spin_unlock_irqrestore(&rtc_lock, flags); + continue; + } + spin_unlock_irqrestore(&rtc_lock, flags); + + return true; + } + return false; +} +EXPORT_SYMBOL_GPL(mc146818_avoid_UIP); + /* * If the UIP (Update-in-progress) bit of the RTC is set for more then * 10ms, the RTC is apparently broken or not present. diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index dc6c00768d919..d694e3ff80865 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -661,13 +661,13 @@ static void qeth_l2_dev2br_fdb_notify(struct qeth_card *card, u8 code, card->dev, &info.info, NULL); QETH_CARD_TEXT(card, 4, "andelmac"); QETH_CARD_TEXT_(card, 4, - "mc%012lx", ether_addr_to_u64(ntfy_mac)); + "mc%012llx", ether_addr_to_u64(ntfy_mac)); } else { call_switchdev_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE, card->dev, &info.info, NULL); QETH_CARD_TEXT(card, 4, "anaddmac"); QETH_CARD_TEXT_(card, 4, - "mc%012lx", ether_addr_to_u64(ntfy_mac)); + "mc%012llx", ether_addr_to_u64(ntfy_mac)); } } @@ -764,9 +764,8 @@ static void qeth_l2_br2dev_worker(struct work_struct *work) struct list_head *iter; int err = 0; - kfree(br2dev_event_work); - QETH_CARD_TEXT_(card, 4, "b2dw%04x", event); - QETH_CARD_TEXT_(card, 4, "ma%012lx", ether_addr_to_u64(addr)); + QETH_CARD_TEXT_(card, 4, "b2dw%04lx", event); + QETH_CARD_TEXT_(card, 4, "ma%012llx", ether_addr_to_u64(addr)); rcu_read_lock(); /* Verify preconditions are still valid: */ @@ -795,7 +794,7 @@ static void qeth_l2_br2dev_worker(struct work_struct *work) if (err) { QETH_CARD_TEXT(card, 2, "b2derris"); QETH_CARD_TEXT_(card, 2, - "err%02x%03d", event, + "err%02lx%03d", event, lowerdev->ifindex); } } @@ -813,7 +812,7 @@ static void qeth_l2_br2dev_worker(struct work_struct *work) break; } if (err) - QETH_CARD_TEXT_(card, 2, "b2derr%02x", event); + QETH_CARD_TEXT_(card, 2, "b2derr%02lx", event); } unlock: @@ -821,6 +820,7 @@ unlock: dev_put(brdev); dev_put(lsyncdev); dev_put(dstdev); + kfree(br2dev_event_work); } static int qeth_l2_br2dev_queue_work(struct net_device *brdev, @@ -878,7 +878,7 @@ static int qeth_l2_switchdev_event(struct notifier_block *unused, while (lowerdev) { if (qeth_l2_must_learn(lowerdev, dstdev)) { card = lowerdev->ml_priv; - QETH_CARD_TEXT_(card, 4, "b2dqw%03x", event); + QETH_CARD_TEXT_(card, 4, "b2dqw%03lx", event); rc = qeth_l2_br2dev_queue_work(brdev, lowerdev, dstdev, event, fdb_info->addr); diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 89ee033f0c353..bbb57b9f6e01e 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1285,6 +1285,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev, cdns->msg_count = 0; bus->link_id = auxdev->id; + bus->clk_stop_timeout = 1; sdw_cdns_probe(cdns); diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index 2ca19b01948a2..49acba1dea1e7 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -912,14 +912,20 @@ static int mtk_spi_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct mtk_spi *mdata = spi_master_get_devdata(master); + int ret; - pm_runtime_disable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret < 0) + return ret; mtk_spi_reset(mdata); if (mdata->dev_comp->no_need_unprepare) clk_unprepare(mdata->spi_clk); + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + return 0; } diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index dfa1d9eedde1a..4812ba4bbedd7 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -291,7 +291,8 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, * * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2 */ - if (dwc->gadget->speed <= USB_SPEED_HIGH) { + if (dwc->gadget->speed <= USB_SPEED_HIGH || + DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_ENDTRANSFER) { reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) { saved_config |= DWC3_GUSB2PHYCFG_SUSPHY; diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index e035a63bbe5b7..1f37904b0405e 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -601,7 +601,7 @@ static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info, if (scr_readw(r) != vc->vc_video_erase_char) break; if (r != q && new_rows >= rows + logo_lines) { - save = kmalloc(array3_size(logo_lines, new_cols, 2), + save = kzalloc(array3_size(logo_lines, new_cols, 2), GFP_KERNEL); if (save) { int i = cols < new_cols ? cols : new_cols; diff --git a/fs/Makefile b/fs/Makefile index 84c5e4cdfee5a..d504be65a210a 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -32,8 +32,6 @@ obj-$(CONFIG_TIMERFD) += timerfd.o obj-$(CONFIG_EVENTFD) += eventfd.o obj-$(CONFIG_USERFAULTFD) += userfaultfd.o obj-$(CONFIG_AIO) += aio.o -obj-$(CONFIG_IO_URING) += io_uring.o -obj-$(CONFIG_IO_WQ) += io-wq.o obj-$(CONFIG_FS_DAX) += dax.o obj-$(CONFIG_FS_ENCRYPTION) += crypto/ obj-$(CONFIG_FS_VERITY) += verity/ diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 4d2c6ce29fe58..9250a17731bdb 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -5398,6 +5398,7 @@ static int clone_range(struct send_ctx *sctx, u64 ext_len; u64 clone_len; u64 clone_data_offset; + bool crossed_src_i_size = false; if (slot >= btrfs_header_nritems(leaf)) { ret = btrfs_next_leaf(clone_root->root, path); @@ -5454,8 +5455,10 @@ static int clone_range(struct send_ctx *sctx, if (key.offset >= clone_src_i_size) break; - if (key.offset + ext_len > clone_src_i_size) + if (key.offset + ext_len > clone_src_i_size) { ext_len = clone_src_i_size - key.offset; + crossed_src_i_size = true; + } clone_data_offset = btrfs_file_extent_offset(leaf, ei); if (btrfs_file_extent_disk_bytenr(leaf, ei) == disk_byte) { @@ -5515,6 +5518,25 @@ static int clone_range(struct send_ctx *sctx, ret = send_clone(sctx, offset, clone_len, clone_root); } + } else if (crossed_src_i_size && clone_len < len) { + /* + * If we are at i_size of the clone source inode and we + * can not clone from it, terminate the loop. This is + * to avoid sending two write operations, one with a + * length matching clone_len and the final one after + * this loop with a length of len - clone_len. + * + * When using encoded writes (BTRFS_SEND_FLAG_COMPRESSED + * was passed to the send ioctl), this helps avoid + * sending an encoded write for an offset that is not + * sector size aligned, in case the i_size of the source + * inode is not sector size aligned. That will make the + * receiver fallback to decompression of the data and + * writing it using regular buffered IO, therefore while + * not incorrect, it's not optimal due decompression and + * possible re-compression at the receiver. + */ + break; } else { ret = send_extent_data(sctx, offset, clone_len); } diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index c6e2a0ff8f0c6..a4284c4d7e031 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1392,6 +1392,7 @@ cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect) server->session_key.response = NULL; server->session_key.len = 0; kfree(server->hostname); + server->hostname = NULL; task = xchg(&server->tsk, NULL); if (task) diff --git a/fs/file.c b/fs/file.c index ee93173467025..214364e19d76f 100644 --- a/fs/file.c +++ b/fs/file.c @@ -1029,7 +1029,16 @@ static unsigned long __fget_light(unsigned int fd, fmode_t mask) struct files_struct *files = current->files; struct file *file; - if (atomic_read(&files->count) == 1) { + /* + * If another thread is concurrently calling close_fd() followed + * by put_files_struct(), we must not observe the old table + * entry combined with the new refcount - otherwise we could + * return a file that is concurrently being freed. + * + * atomic_read_acquire() pairs with atomic_dec_and_test() in + * put_files_struct(). + */ + if (atomic_read_acquire(&files->count) == 1) { file = files_lookup_fd_raw(files, fd); if (!file || unlikely(file->f_mode & mask)) return 0; diff --git a/fs/io-wq.c b/fs/io-wq.c deleted file mode 100644 index 6031fb319d878..0000000000000 --- a/fs/io-wq.c +++ /dev/null @@ -1,1398 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Basic worker thread pool for io_uring - * - * Copyright (C) 2019 Jens Axboe - * - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "io-wq.h" - -#define WORKER_IDLE_TIMEOUT (5 * HZ) - -enum { - IO_WORKER_F_UP = 1, /* up and active */ - IO_WORKER_F_RUNNING = 2, /* account as running */ - IO_WORKER_F_FREE = 4, /* worker on free list */ - IO_WORKER_F_BOUND = 8, /* is doing bounded work */ -}; - -enum { - IO_WQ_BIT_EXIT = 0, /* wq exiting */ -}; - -enum { - IO_ACCT_STALLED_BIT = 0, /* stalled on hash */ -}; - -/* - * One for each thread in a wqe pool - */ -struct io_worker { - refcount_t ref; - unsigned flags; - struct hlist_nulls_node nulls_node; - struct list_head all_list; - struct task_struct *task; - struct io_wqe *wqe; - - struct io_wq_work *cur_work; - spinlock_t lock; - - struct completion ref_done; - - unsigned long create_state; - struct callback_head create_work; - int create_index; - - union { - struct rcu_head rcu; - struct work_struct work; - }; -}; - -#if BITS_PER_LONG == 64 -#define IO_WQ_HASH_ORDER 6 -#else -#define IO_WQ_HASH_ORDER 5 -#endif - -#define IO_WQ_NR_HASH_BUCKETS (1u << IO_WQ_HASH_ORDER) - -struct io_wqe_acct { - unsigned nr_workers; - unsigned max_workers; - int index; - atomic_t nr_running; - struct io_wq_work_list work_list; - unsigned long flags; -}; - -enum { - IO_WQ_ACCT_BOUND, - IO_WQ_ACCT_UNBOUND, - IO_WQ_ACCT_NR, -}; - -/* - * Per-node worker thread pool - */ -struct io_wqe { - raw_spinlock_t lock; - struct io_wqe_acct acct[2]; - - int node; - - struct hlist_nulls_head free_list; - struct list_head all_list; - - struct wait_queue_entry wait; - - struct io_wq *wq; - struct io_wq_work *hash_tail[IO_WQ_NR_HASH_BUCKETS]; - - cpumask_var_t cpu_mask; -}; - -/* - * Per io_wq state - */ -struct io_wq { - unsigned long state; - - free_work_fn *free_work; - io_wq_work_fn *do_work; - - struct io_wq_hash *hash; - - atomic_t worker_refs; - struct completion worker_done; - - struct hlist_node cpuhp_node; - - struct task_struct *task; - - struct io_wqe *wqes[]; -}; - -static enum cpuhp_state io_wq_online; - -struct io_cb_cancel_data { - work_cancel_fn *fn; - void *data; - int nr_running; - int nr_pending; - bool cancel_all; -}; - -static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index); -static void io_wqe_dec_running(struct io_worker *worker); -static bool io_acct_cancel_pending_work(struct io_wqe *wqe, - struct io_wqe_acct *acct, - struct io_cb_cancel_data *match); -static void create_worker_cb(struct callback_head *cb); -static void io_wq_cancel_tw_create(struct io_wq *wq); - -static bool io_worker_get(struct io_worker *worker) -{ - return refcount_inc_not_zero(&worker->ref); -} - -static void io_worker_release(struct io_worker *worker) -{ - if (refcount_dec_and_test(&worker->ref)) - complete(&worker->ref_done); -} - -static inline struct io_wqe_acct *io_get_acct(struct io_wqe *wqe, bool bound) -{ - return &wqe->acct[bound ? IO_WQ_ACCT_BOUND : IO_WQ_ACCT_UNBOUND]; -} - -static inline struct io_wqe_acct *io_work_get_acct(struct io_wqe *wqe, - struct io_wq_work *work) -{ - return io_get_acct(wqe, !(work->flags & IO_WQ_WORK_UNBOUND)); -} - -static inline struct io_wqe_acct *io_wqe_get_acct(struct io_worker *worker) -{ - return io_get_acct(worker->wqe, worker->flags & IO_WORKER_F_BOUND); -} - -static void io_worker_ref_put(struct io_wq *wq) -{ - if (atomic_dec_and_test(&wq->worker_refs)) - complete(&wq->worker_done); -} - -static void io_worker_cancel_cb(struct io_worker *worker) -{ - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - struct io_wqe *wqe = worker->wqe; - struct io_wq *wq = wqe->wq; - - atomic_dec(&acct->nr_running); - raw_spin_lock(&worker->wqe->lock); - acct->nr_workers--; - raw_spin_unlock(&worker->wqe->lock); - io_worker_ref_put(wq); - clear_bit_unlock(0, &worker->create_state); - io_worker_release(worker); -} - -static bool io_task_worker_match(struct callback_head *cb, void *data) -{ - struct io_worker *worker; - - if (cb->func != create_worker_cb) - return false; - worker = container_of(cb, struct io_worker, create_work); - return worker == data; -} - -static void io_worker_exit(struct io_worker *worker) -{ - struct io_wqe *wqe = worker->wqe; - struct io_wq *wq = wqe->wq; - - while (1) { - struct callback_head *cb = task_work_cancel_match(wq->task, - io_task_worker_match, worker); - - if (!cb) - break; - io_worker_cancel_cb(worker); - } - - if (refcount_dec_and_test(&worker->ref)) - complete(&worker->ref_done); - wait_for_completion(&worker->ref_done); - - raw_spin_lock(&wqe->lock); - if (worker->flags & IO_WORKER_F_FREE) - hlist_nulls_del_rcu(&worker->nulls_node); - list_del_rcu(&worker->all_list); - preempt_disable(); - io_wqe_dec_running(worker); - worker->flags = 0; - current->flags &= ~PF_IO_WORKER; - preempt_enable(); - raw_spin_unlock(&wqe->lock); - - kfree_rcu(worker, rcu); - io_worker_ref_put(wqe->wq); - do_exit(0); -} - -static inline bool io_acct_run_queue(struct io_wqe_acct *acct) -{ - if (!wq_list_empty(&acct->work_list) && - !test_bit(IO_ACCT_STALLED_BIT, &acct->flags)) - return true; - return false; -} - -/* - * Check head of free list for an available worker. If one isn't available, - * caller must create one. - */ -static bool io_wqe_activate_free_worker(struct io_wqe *wqe, - struct io_wqe_acct *acct) - __must_hold(RCU) -{ - struct hlist_nulls_node *n; - struct io_worker *worker; - - /* - * Iterate free_list and see if we can find an idle worker to - * activate. If a given worker is on the free_list but in the process - * of exiting, keep trying. - */ - hlist_nulls_for_each_entry_rcu(worker, n, &wqe->free_list, nulls_node) { - if (!io_worker_get(worker)) - continue; - if (io_wqe_get_acct(worker) != acct) { - io_worker_release(worker); - continue; - } - if (wake_up_process(worker->task)) { - io_worker_release(worker); - return true; - } - io_worker_release(worker); - } - - return false; -} - -/* - * We need a worker. If we find a free one, we're good. If not, and we're - * below the max number of workers, create one. - */ -static bool io_wqe_create_worker(struct io_wqe *wqe, struct io_wqe_acct *acct) -{ - /* - * Most likely an attempt to queue unbounded work on an io_wq that - * wasn't setup with any unbounded workers. - */ - if (unlikely(!acct->max_workers)) - pr_warn_once("io-wq is not configured for unbound workers"); - - raw_spin_lock(&wqe->lock); - if (acct->nr_workers >= acct->max_workers) { - raw_spin_unlock(&wqe->lock); - return true; - } - acct->nr_workers++; - raw_spin_unlock(&wqe->lock); - atomic_inc(&acct->nr_running); - atomic_inc(&wqe->wq->worker_refs); - return create_io_worker(wqe->wq, wqe, acct->index); -} - -static void io_wqe_inc_running(struct io_worker *worker) -{ - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - - atomic_inc(&acct->nr_running); -} - -static void create_worker_cb(struct callback_head *cb) -{ - struct io_worker *worker; - struct io_wq *wq; - struct io_wqe *wqe; - struct io_wqe_acct *acct; - bool do_create = false; - - worker = container_of(cb, struct io_worker, create_work); - wqe = worker->wqe; - wq = wqe->wq; - acct = &wqe->acct[worker->create_index]; - raw_spin_lock(&wqe->lock); - if (acct->nr_workers < acct->max_workers) { - acct->nr_workers++; - do_create = true; - } - raw_spin_unlock(&wqe->lock); - if (do_create) { - create_io_worker(wq, wqe, worker->create_index); - } else { - atomic_dec(&acct->nr_running); - io_worker_ref_put(wq); - } - clear_bit_unlock(0, &worker->create_state); - io_worker_release(worker); -} - -static bool io_queue_worker_create(struct io_worker *worker, - struct io_wqe_acct *acct, - task_work_func_t func) -{ - struct io_wqe *wqe = worker->wqe; - struct io_wq *wq = wqe->wq; - - /* raced with exit, just ignore create call */ - if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) - goto fail; - if (!io_worker_get(worker)) - goto fail; - /* - * create_state manages ownership of create_work/index. We should - * only need one entry per worker, as the worker going to sleep - * will trigger the condition, and waking will clear it once it - * runs the task_work. - */ - if (test_bit(0, &worker->create_state) || - test_and_set_bit_lock(0, &worker->create_state)) - goto fail_release; - - atomic_inc(&wq->worker_refs); - init_task_work(&worker->create_work, func); - worker->create_index = acct->index; - if (!task_work_add(wq->task, &worker->create_work, TWA_SIGNAL)) { - /* - * EXIT may have been set after checking it above, check after - * adding the task_work and remove any creation item if it is - * now set. wq exit does that too, but we can have added this - * work item after we canceled in io_wq_exit_workers(). - */ - if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) - io_wq_cancel_tw_create(wq); - io_worker_ref_put(wq); - return true; - } - io_worker_ref_put(wq); - clear_bit_unlock(0, &worker->create_state); -fail_release: - io_worker_release(worker); -fail: - atomic_dec(&acct->nr_running); - io_worker_ref_put(wq); - return false; -} - -static void io_wqe_dec_running(struct io_worker *worker) - __must_hold(wqe->lock) -{ - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - struct io_wqe *wqe = worker->wqe; - - if (!(worker->flags & IO_WORKER_F_UP)) - return; - - if (atomic_dec_and_test(&acct->nr_running) && io_acct_run_queue(acct)) { - atomic_inc(&acct->nr_running); - atomic_inc(&wqe->wq->worker_refs); - raw_spin_unlock(&wqe->lock); - io_queue_worker_create(worker, acct, create_worker_cb); - raw_spin_lock(&wqe->lock); - } -} - -/* - * Worker will start processing some work. Move it to the busy list, if - * it's currently on the freelist - */ -static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, - struct io_wq_work *work) - __must_hold(wqe->lock) -{ - if (worker->flags & IO_WORKER_F_FREE) { - worker->flags &= ~IO_WORKER_F_FREE; - hlist_nulls_del_init_rcu(&worker->nulls_node); - } -} - -/* - * No work, worker going to sleep. Move to freelist, and unuse mm if we - * have one attached. Dropping the mm may potentially sleep, so we drop - * the lock in that case and return success. Since the caller has to - * retry the loop in that case (we changed task state), we don't regrab - * the lock if we return success. - */ -static void __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker) - __must_hold(wqe->lock) -{ - if (!(worker->flags & IO_WORKER_F_FREE)) { - worker->flags |= IO_WORKER_F_FREE; - hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); - } -} - -static inline unsigned int io_get_work_hash(struct io_wq_work *work) -{ - return work->flags >> IO_WQ_HASH_SHIFT; -} - -static bool io_wait_on_hash(struct io_wqe *wqe, unsigned int hash) -{ - struct io_wq *wq = wqe->wq; - bool ret = false; - - spin_lock_irq(&wq->hash->wait.lock); - if (list_empty(&wqe->wait.entry)) { - __add_wait_queue(&wq->hash->wait, &wqe->wait); - if (!test_bit(hash, &wq->hash->map)) { - __set_current_state(TASK_RUNNING); - list_del_init(&wqe->wait.entry); - ret = true; - } - } - spin_unlock_irq(&wq->hash->wait.lock); - return ret; -} - -static struct io_wq_work *io_get_next_work(struct io_wqe_acct *acct, - struct io_worker *worker) - __must_hold(wqe->lock) -{ - struct io_wq_work_node *node, *prev; - struct io_wq_work *work, *tail; - unsigned int stall_hash = -1U; - struct io_wqe *wqe = worker->wqe; - - wq_list_for_each(node, prev, &acct->work_list) { - unsigned int hash; - - work = container_of(node, struct io_wq_work, list); - - /* not hashed, can run anytime */ - if (!io_wq_is_hashed(work)) { - wq_list_del(&acct->work_list, node, prev); - return work; - } - - hash = io_get_work_hash(work); - /* all items with this hash lie in [work, tail] */ - tail = wqe->hash_tail[hash]; - - /* hashed, can run if not already running */ - if (!test_and_set_bit(hash, &wqe->wq->hash->map)) { - wqe->hash_tail[hash] = NULL; - wq_list_cut(&acct->work_list, &tail->list, prev); - return work; - } - if (stall_hash == -1U) - stall_hash = hash; - /* fast forward to a next hash, for-each will fix up @prev */ - node = &tail->list; - } - - if (stall_hash != -1U) { - bool unstalled; - - /* - * Set this before dropping the lock to avoid racing with new - * work being added and clearing the stalled bit. - */ - set_bit(IO_ACCT_STALLED_BIT, &acct->flags); - raw_spin_unlock(&wqe->lock); - unstalled = io_wait_on_hash(wqe, stall_hash); - raw_spin_lock(&wqe->lock); - if (unstalled) { - clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); - if (wq_has_sleeper(&wqe->wq->hash->wait)) - wake_up(&wqe->wq->hash->wait); - } - } - - return NULL; -} - -static bool io_flush_signals(void) -{ - if (unlikely(test_thread_flag(TIF_NOTIFY_SIGNAL))) { - __set_current_state(TASK_RUNNING); - tracehook_notify_signal(); - return true; - } - return false; -} - -static void io_assign_current_work(struct io_worker *worker, - struct io_wq_work *work) -{ - if (work) { - io_flush_signals(); - cond_resched(); - } - - spin_lock(&worker->lock); - worker->cur_work = work; - spin_unlock(&worker->lock); -} - -static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work); - -static void io_worker_handle_work(struct io_worker *worker) - __releases(wqe->lock) -{ - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - struct io_wqe *wqe = worker->wqe; - struct io_wq *wq = wqe->wq; - bool do_kill = test_bit(IO_WQ_BIT_EXIT, &wq->state); - - do { - struct io_wq_work *work; -get_next: - /* - * If we got some work, mark us as busy. If we didn't, but - * the list isn't empty, it means we stalled on hashed work. - * Mark us stalled so we don't keep looking for work when we - * can't make progress, any work completion or insertion will - * clear the stalled flag. - */ - work = io_get_next_work(acct, worker); - if (work) - __io_worker_busy(wqe, worker, work); - - raw_spin_unlock(&wqe->lock); - if (!work) - break; - io_assign_current_work(worker, work); - __set_current_state(TASK_RUNNING); - - /* handle a whole dependent link */ - do { - struct io_wq_work *next_hashed, *linked; - unsigned int hash = io_get_work_hash(work); - - next_hashed = wq_next_work(work); - - if (unlikely(do_kill) && (work->flags & IO_WQ_WORK_UNBOUND)) - work->flags |= IO_WQ_WORK_CANCEL; - wq->do_work(work); - io_assign_current_work(worker, NULL); - - linked = wq->free_work(work); - work = next_hashed; - if (!work && linked && !io_wq_is_hashed(linked)) { - work = linked; - linked = NULL; - } - io_assign_current_work(worker, work); - if (linked) - io_wqe_enqueue(wqe, linked); - - if (hash != -1U && !next_hashed) { - /* serialize hash clear with wake_up() */ - spin_lock_irq(&wq->hash->wait.lock); - clear_bit(hash, &wq->hash->map); - clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); - spin_unlock_irq(&wq->hash->wait.lock); - if (wq_has_sleeper(&wq->hash->wait)) - wake_up(&wq->hash->wait); - raw_spin_lock(&wqe->lock); - /* skip unnecessary unlock-lock wqe->lock */ - if (!work) - goto get_next; - raw_spin_unlock(&wqe->lock); - } - } while (work); - - raw_spin_lock(&wqe->lock); - } while (1); -} - -static int io_wqe_worker(void *data) -{ - struct io_worker *worker = data; - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - struct io_wqe *wqe = worker->wqe; - struct io_wq *wq = wqe->wq; - bool last_timeout = false; - char buf[TASK_COMM_LEN]; - - worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING); - - snprintf(buf, sizeof(buf), "iou-wrk-%d", wq->task->pid); - set_task_comm(current, buf); - - while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) { - long ret; - - set_current_state(TASK_INTERRUPTIBLE); -loop: - raw_spin_lock(&wqe->lock); - if (io_acct_run_queue(acct)) { - io_worker_handle_work(worker); - goto loop; - } - /* timed out, exit unless we're the last worker */ - if (last_timeout && acct->nr_workers > 1) { - acct->nr_workers--; - raw_spin_unlock(&wqe->lock); - __set_current_state(TASK_RUNNING); - break; - } - last_timeout = false; - __io_worker_idle(wqe, worker); - raw_spin_unlock(&wqe->lock); - if (io_flush_signals()) - continue; - ret = schedule_timeout(WORKER_IDLE_TIMEOUT); - if (signal_pending(current)) { - struct ksignal ksig; - - if (!get_signal(&ksig)) - continue; - break; - } - last_timeout = !ret; - } - - if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) { - raw_spin_lock(&wqe->lock); - io_worker_handle_work(worker); - } - - io_worker_exit(worker); - return 0; -} - -/* - * Called when a worker is scheduled in. Mark us as currently running. - */ -void io_wq_worker_running(struct task_struct *tsk) -{ - struct io_worker *worker = tsk->pf_io_worker; - - if (!worker) - return; - if (!(worker->flags & IO_WORKER_F_UP)) - return; - if (worker->flags & IO_WORKER_F_RUNNING) - return; - worker->flags |= IO_WORKER_F_RUNNING; - io_wqe_inc_running(worker); -} - -/* - * Called when worker is going to sleep. If there are no workers currently - * running and we have work pending, wake up a free one or create a new one. - */ -void io_wq_worker_sleeping(struct task_struct *tsk) -{ - struct io_worker *worker = tsk->pf_io_worker; - - if (!worker) - return; - if (!(worker->flags & IO_WORKER_F_UP)) - return; - if (!(worker->flags & IO_WORKER_F_RUNNING)) - return; - - worker->flags &= ~IO_WORKER_F_RUNNING; - - raw_spin_lock(&worker->wqe->lock); - io_wqe_dec_running(worker); - raw_spin_unlock(&worker->wqe->lock); -} - -static void io_init_new_worker(struct io_wqe *wqe, struct io_worker *worker, - struct task_struct *tsk) -{ - tsk->pf_io_worker = worker; - worker->task = tsk; - set_cpus_allowed_ptr(tsk, wqe->cpu_mask); - tsk->flags |= PF_NO_SETAFFINITY; - - raw_spin_lock(&wqe->lock); - hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); - list_add_tail_rcu(&worker->all_list, &wqe->all_list); - worker->flags |= IO_WORKER_F_FREE; - raw_spin_unlock(&wqe->lock); - wake_up_new_task(tsk); -} - -static bool io_wq_work_match_all(struct io_wq_work *work, void *data) -{ - return true; -} - -static inline bool io_should_retry_thread(long err) -{ - /* - * Prevent perpetual task_work retry, if the task (or its group) is - * exiting. - */ - if (fatal_signal_pending(current)) - return false; - - switch (err) { - case -EAGAIN: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - case -ERESTARTNOHAND: - return true; - default: - return false; - } -} - -static void create_worker_cont(struct callback_head *cb) -{ - struct io_worker *worker; - struct task_struct *tsk; - struct io_wqe *wqe; - - worker = container_of(cb, struct io_worker, create_work); - clear_bit_unlock(0, &worker->create_state); - wqe = worker->wqe; - tsk = create_io_thread(io_wqe_worker, worker, wqe->node); - if (!IS_ERR(tsk)) { - io_init_new_worker(wqe, worker, tsk); - io_worker_release(worker); - return; - } else if (!io_should_retry_thread(PTR_ERR(tsk))) { - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - - atomic_dec(&acct->nr_running); - raw_spin_lock(&wqe->lock); - acct->nr_workers--; - if (!acct->nr_workers) { - struct io_cb_cancel_data match = { - .fn = io_wq_work_match_all, - .cancel_all = true, - }; - - while (io_acct_cancel_pending_work(wqe, acct, &match)) - raw_spin_lock(&wqe->lock); - } - raw_spin_unlock(&wqe->lock); - io_worker_ref_put(wqe->wq); - kfree(worker); - return; - } - - /* re-create attempts grab a new worker ref, drop the existing one */ - io_worker_release(worker); - schedule_work(&worker->work); -} - -static void io_workqueue_create(struct work_struct *work) -{ - struct io_worker *worker = container_of(work, struct io_worker, work); - struct io_wqe_acct *acct = io_wqe_get_acct(worker); - - if (!io_queue_worker_create(worker, acct, create_worker_cont)) - kfree(worker); -} - -static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index) -{ - struct io_wqe_acct *acct = &wqe->acct[index]; - struct io_worker *worker; - struct task_struct *tsk; - - __set_current_state(TASK_RUNNING); - - worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node); - if (!worker) { -fail: - atomic_dec(&acct->nr_running); - raw_spin_lock(&wqe->lock); - acct->nr_workers--; - raw_spin_unlock(&wqe->lock); - io_worker_ref_put(wq); - return false; - } - - refcount_set(&worker->ref, 1); - worker->wqe = wqe; - spin_lock_init(&worker->lock); - init_completion(&worker->ref_done); - - if (index == IO_WQ_ACCT_BOUND) - worker->flags |= IO_WORKER_F_BOUND; - - tsk = create_io_thread(io_wqe_worker, worker, wqe->node); - if (!IS_ERR(tsk)) { - io_init_new_worker(wqe, worker, tsk); - } else if (!io_should_retry_thread(PTR_ERR(tsk))) { - kfree(worker); - goto fail; - } else { - INIT_WORK(&worker->work, io_workqueue_create); - schedule_work(&worker->work); - } - - return true; -} - -/* - * Iterate the passed in list and call the specific function for each - * worker that isn't exiting - */ -static bool io_wq_for_each_worker(struct io_wqe *wqe, - bool (*func)(struct io_worker *, void *), - void *data) -{ - struct io_worker *worker; - bool ret = false; - - list_for_each_entry_rcu(worker, &wqe->all_list, all_list) { - if (io_worker_get(worker)) { - /* no task if node is/was offline */ - if (worker->task) - ret = func(worker, data); - io_worker_release(worker); - if (ret) - break; - } - } - - return ret; -} - -static bool io_wq_worker_wake(struct io_worker *worker, void *data) -{ - set_notify_signal(worker->task); - wake_up_process(worker->task); - return false; -} - -static void io_run_cancel(struct io_wq_work *work, struct io_wqe *wqe) -{ - struct io_wq *wq = wqe->wq; - - do { - work->flags |= IO_WQ_WORK_CANCEL; - wq->do_work(work); - work = wq->free_work(work); - } while (work); -} - -static void io_wqe_insert_work(struct io_wqe *wqe, struct io_wq_work *work) -{ - struct io_wqe_acct *acct = io_work_get_acct(wqe, work); - unsigned int hash; - struct io_wq_work *tail; - - if (!io_wq_is_hashed(work)) { -append: - wq_list_add_tail(&work->list, &acct->work_list); - return; - } - - hash = io_get_work_hash(work); - tail = wqe->hash_tail[hash]; - wqe->hash_tail[hash] = work; - if (!tail) - goto append; - - wq_list_add_after(&work->list, &tail->list, &acct->work_list); -} - -static bool io_wq_work_match_item(struct io_wq_work *work, void *data) -{ - return work == data; -} - -static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work) -{ - struct io_wqe_acct *acct = io_work_get_acct(wqe, work); - unsigned work_flags = work->flags; - bool do_create; - - /* - * If io-wq is exiting for this task, or if the request has explicitly - * been marked as one that should not get executed, cancel it here. - */ - if (test_bit(IO_WQ_BIT_EXIT, &wqe->wq->state) || - (work->flags & IO_WQ_WORK_CANCEL)) { - io_run_cancel(work, wqe); - return; - } - - raw_spin_lock(&wqe->lock); - io_wqe_insert_work(wqe, work); - clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); - - rcu_read_lock(); - do_create = !io_wqe_activate_free_worker(wqe, acct); - rcu_read_unlock(); - - raw_spin_unlock(&wqe->lock); - - if (do_create && ((work_flags & IO_WQ_WORK_CONCURRENT) || - !atomic_read(&acct->nr_running))) { - bool did_create; - - did_create = io_wqe_create_worker(wqe, acct); - if (likely(did_create)) - return; - - raw_spin_lock(&wqe->lock); - /* fatal condition, failed to create the first worker */ - if (!acct->nr_workers) { - struct io_cb_cancel_data match = { - .fn = io_wq_work_match_item, - .data = work, - .cancel_all = false, - }; - - if (io_acct_cancel_pending_work(wqe, acct, &match)) - raw_spin_lock(&wqe->lock); - } - raw_spin_unlock(&wqe->lock); - } -} - -void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work) -{ - struct io_wqe *wqe = wq->wqes[numa_node_id()]; - - io_wqe_enqueue(wqe, work); -} - -/* - * Work items that hash to the same value will not be done in parallel. - * Used to limit concurrent writes, generally hashed by inode. - */ -void io_wq_hash_work(struct io_wq_work *work, void *val) -{ - unsigned int bit; - - bit = hash_ptr(val, IO_WQ_HASH_ORDER); - work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT)); -} - -static bool io_wq_worker_cancel(struct io_worker *worker, void *data) -{ - struct io_cb_cancel_data *match = data; - - /* - * Hold the lock to avoid ->cur_work going out of scope, caller - * may dereference the passed in work. - */ - spin_lock(&worker->lock); - if (worker->cur_work && - match->fn(worker->cur_work, match->data)) { - set_notify_signal(worker->task); - match->nr_running++; - } - spin_unlock(&worker->lock); - - return match->nr_running && !match->cancel_all; -} - -static inline void io_wqe_remove_pending(struct io_wqe *wqe, - struct io_wq_work *work, - struct io_wq_work_node *prev) -{ - struct io_wqe_acct *acct = io_work_get_acct(wqe, work); - unsigned int hash = io_get_work_hash(work); - struct io_wq_work *prev_work = NULL; - - if (io_wq_is_hashed(work) && work == wqe->hash_tail[hash]) { - if (prev) - prev_work = container_of(prev, struct io_wq_work, list); - if (prev_work && io_get_work_hash(prev_work) == hash) - wqe->hash_tail[hash] = prev_work; - else - wqe->hash_tail[hash] = NULL; - } - wq_list_del(&acct->work_list, &work->list, prev); -} - -static bool io_acct_cancel_pending_work(struct io_wqe *wqe, - struct io_wqe_acct *acct, - struct io_cb_cancel_data *match) - __releases(wqe->lock) -{ - struct io_wq_work_node *node, *prev; - struct io_wq_work *work; - - wq_list_for_each(node, prev, &acct->work_list) { - work = container_of(node, struct io_wq_work, list); - if (!match->fn(work, match->data)) - continue; - io_wqe_remove_pending(wqe, work, prev); - raw_spin_unlock(&wqe->lock); - io_run_cancel(work, wqe); - match->nr_pending++; - /* not safe to continue after unlock */ - return true; - } - - return false; -} - -static void io_wqe_cancel_pending_work(struct io_wqe *wqe, - struct io_cb_cancel_data *match) -{ - int i; -retry: - raw_spin_lock(&wqe->lock); - for (i = 0; i < IO_WQ_ACCT_NR; i++) { - struct io_wqe_acct *acct = io_get_acct(wqe, i == 0); - - if (io_acct_cancel_pending_work(wqe, acct, match)) { - if (match->cancel_all) - goto retry; - return; - } - } - raw_spin_unlock(&wqe->lock); -} - -static void io_wqe_cancel_running_work(struct io_wqe *wqe, - struct io_cb_cancel_data *match) -{ - rcu_read_lock(); - io_wq_for_each_worker(wqe, io_wq_worker_cancel, match); - rcu_read_unlock(); -} - -enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, - void *data, bool cancel_all) -{ - struct io_cb_cancel_data match = { - .fn = cancel, - .data = data, - .cancel_all = cancel_all, - }; - int node; - - /* - * First check pending list, if we're lucky we can just remove it - * from there. CANCEL_OK means that the work is returned as-new, - * no completion will be posted for it. - */ - for_each_node(node) { - struct io_wqe *wqe = wq->wqes[node]; - - io_wqe_cancel_pending_work(wqe, &match); - if (match.nr_pending && !match.cancel_all) - return IO_WQ_CANCEL_OK; - } - - /* - * Now check if a free (going busy) or busy worker has the work - * currently running. If we find it there, we'll return CANCEL_RUNNING - * as an indication that we attempt to signal cancellation. The - * completion will run normally in this case. - */ - for_each_node(node) { - struct io_wqe *wqe = wq->wqes[node]; - - io_wqe_cancel_running_work(wqe, &match); - if (match.nr_running && !match.cancel_all) - return IO_WQ_CANCEL_RUNNING; - } - - if (match.nr_running) - return IO_WQ_CANCEL_RUNNING; - if (match.nr_pending) - return IO_WQ_CANCEL_OK; - return IO_WQ_CANCEL_NOTFOUND; -} - -static int io_wqe_hash_wake(struct wait_queue_entry *wait, unsigned mode, - int sync, void *key) -{ - struct io_wqe *wqe = container_of(wait, struct io_wqe, wait); - int i; - - list_del_init(&wait->entry); - - rcu_read_lock(); - for (i = 0; i < IO_WQ_ACCT_NR; i++) { - struct io_wqe_acct *acct = &wqe->acct[i]; - - if (test_and_clear_bit(IO_ACCT_STALLED_BIT, &acct->flags)) - io_wqe_activate_free_worker(wqe, acct); - } - rcu_read_unlock(); - return 1; -} - -struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) -{ - int ret, node, i; - struct io_wq *wq; - - if (WARN_ON_ONCE(!data->free_work || !data->do_work)) - return ERR_PTR(-EINVAL); - if (WARN_ON_ONCE(!bounded)) - return ERR_PTR(-EINVAL); - - wq = kzalloc(struct_size(wq, wqes, nr_node_ids), GFP_KERNEL); - if (!wq) - return ERR_PTR(-ENOMEM); - ret = cpuhp_state_add_instance_nocalls(io_wq_online, &wq->cpuhp_node); - if (ret) - goto err_wq; - - refcount_inc(&data->hash->refs); - wq->hash = data->hash; - wq->free_work = data->free_work; - wq->do_work = data->do_work; - - ret = -ENOMEM; - for_each_node(node) { - struct io_wqe *wqe; - int alloc_node = node; - - if (!node_online(alloc_node)) - alloc_node = NUMA_NO_NODE; - wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node); - if (!wqe) - goto err; - wq->wqes[node] = wqe; - if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL)) - goto err; - cpumask_copy(wqe->cpu_mask, cpumask_of_node(node)); - wqe->node = alloc_node; - wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded; - wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers = - task_rlimit(current, RLIMIT_NPROC); - INIT_LIST_HEAD(&wqe->wait.entry); - wqe->wait.func = io_wqe_hash_wake; - for (i = 0; i < IO_WQ_ACCT_NR; i++) { - struct io_wqe_acct *acct = &wqe->acct[i]; - - acct->index = i; - atomic_set(&acct->nr_running, 0); - INIT_WQ_LIST(&acct->work_list); - } - wqe->wq = wq; - raw_spin_lock_init(&wqe->lock); - INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0); - INIT_LIST_HEAD(&wqe->all_list); - } - - wq->task = get_task_struct(data->task); - atomic_set(&wq->worker_refs, 1); - init_completion(&wq->worker_done); - return wq; -err: - io_wq_put_hash(data->hash); - cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node); - for_each_node(node) { - if (!wq->wqes[node]) - continue; - free_cpumask_var(wq->wqes[node]->cpu_mask); - kfree(wq->wqes[node]); - } -err_wq: - kfree(wq); - return ERR_PTR(ret); -} - -static bool io_task_work_match(struct callback_head *cb, void *data) -{ - struct io_worker *worker; - - if (cb->func != create_worker_cb && cb->func != create_worker_cont) - return false; - worker = container_of(cb, struct io_worker, create_work); - return worker->wqe->wq == data; -} - -void io_wq_exit_start(struct io_wq *wq) -{ - set_bit(IO_WQ_BIT_EXIT, &wq->state); -} - -static void io_wq_cancel_tw_create(struct io_wq *wq) -{ - struct callback_head *cb; - - while ((cb = task_work_cancel_match(wq->task, io_task_work_match, wq)) != NULL) { - struct io_worker *worker; - - worker = container_of(cb, struct io_worker, create_work); - io_worker_cancel_cb(worker); - } -} - -static void io_wq_exit_workers(struct io_wq *wq) -{ - int node; - - if (!wq->task) - return; - - io_wq_cancel_tw_create(wq); - - rcu_read_lock(); - for_each_node(node) { - struct io_wqe *wqe = wq->wqes[node]; - - io_wq_for_each_worker(wqe, io_wq_worker_wake, NULL); - } - rcu_read_unlock(); - io_worker_ref_put(wq); - wait_for_completion(&wq->worker_done); - - for_each_node(node) { - spin_lock_irq(&wq->hash->wait.lock); - list_del_init(&wq->wqes[node]->wait.entry); - spin_unlock_irq(&wq->hash->wait.lock); - } - put_task_struct(wq->task); - wq->task = NULL; -} - -static void io_wq_destroy(struct io_wq *wq) -{ - int node; - - cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node); - - for_each_node(node) { - struct io_wqe *wqe = wq->wqes[node]; - struct io_cb_cancel_data match = { - .fn = io_wq_work_match_all, - .cancel_all = true, - }; - io_wqe_cancel_pending_work(wqe, &match); - free_cpumask_var(wqe->cpu_mask); - kfree(wqe); - } - io_wq_put_hash(wq->hash); - kfree(wq); -} - -void io_wq_put_and_exit(struct io_wq *wq) -{ - WARN_ON_ONCE(!test_bit(IO_WQ_BIT_EXIT, &wq->state)); - - io_wq_exit_workers(wq); - io_wq_destroy(wq); -} - -struct online_data { - unsigned int cpu; - bool online; -}; - -static bool io_wq_worker_affinity(struct io_worker *worker, void *data) -{ - struct online_data *od = data; - - if (od->online) - cpumask_set_cpu(od->cpu, worker->wqe->cpu_mask); - else - cpumask_clear_cpu(od->cpu, worker->wqe->cpu_mask); - return false; -} - -static int __io_wq_cpu_online(struct io_wq *wq, unsigned int cpu, bool online) -{ - struct online_data od = { - .cpu = cpu, - .online = online - }; - int i; - - rcu_read_lock(); - for_each_node(i) - io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, &od); - rcu_read_unlock(); - return 0; -} - -static int io_wq_cpu_online(unsigned int cpu, struct hlist_node *node) -{ - struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node); - - return __io_wq_cpu_online(wq, cpu, true); -} - -static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node) -{ - struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node); - - return __io_wq_cpu_online(wq, cpu, false); -} - -int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask) -{ - int i; - - rcu_read_lock(); - for_each_node(i) { - struct io_wqe *wqe = wq->wqes[i]; - - if (mask) - cpumask_copy(wqe->cpu_mask, mask); - else - cpumask_copy(wqe->cpu_mask, cpumask_of_node(i)); - } - rcu_read_unlock(); - return 0; -} - -/* - * Set max number of unbounded workers, returns old value. If new_count is 0, - * then just return the old value. - */ -int io_wq_max_workers(struct io_wq *wq, int *new_count) -{ - int prev[IO_WQ_ACCT_NR]; - bool first_node = true; - int i, node; - - BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND); - BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND); - BUILD_BUG_ON((int) IO_WQ_ACCT_NR != 2); - - for (i = 0; i < 2; i++) { - if (new_count[i] > task_rlimit(current, RLIMIT_NPROC)) - new_count[i] = task_rlimit(current, RLIMIT_NPROC); - } - - for (i = 0; i < IO_WQ_ACCT_NR; i++) - prev[i] = 0; - - rcu_read_lock(); - for_each_node(node) { - struct io_wqe *wqe = wq->wqes[node]; - struct io_wqe_acct *acct; - - raw_spin_lock(&wqe->lock); - for (i = 0; i < IO_WQ_ACCT_NR; i++) { - acct = &wqe->acct[i]; - if (first_node) - prev[i] = max_t(int, acct->max_workers, prev[i]); - if (new_count[i]) - acct->max_workers = new_count[i]; - } - raw_spin_unlock(&wqe->lock); - first_node = false; - } - rcu_read_unlock(); - - for (i = 0; i < IO_WQ_ACCT_NR; i++) - new_count[i] = prev[i]; - - return 0; -} - -static __init int io_wq_init(void) -{ - int ret; - - ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "io-wq/online", - io_wq_cpu_online, io_wq_cpu_offline); - if (ret < 0) - return ret; - io_wq_online = ret; - return 0; -} -subsys_initcall(io_wq_init); diff --git a/fs/io-wq.h b/fs/io-wq.h deleted file mode 100644 index bf5c4c5337605..0000000000000 --- a/fs/io-wq.h +++ /dev/null @@ -1,160 +0,0 @@ -#ifndef INTERNAL_IO_WQ_H -#define INTERNAL_IO_WQ_H - -#include - -struct io_wq; - -enum { - IO_WQ_WORK_CANCEL = 1, - IO_WQ_WORK_HASHED = 2, - IO_WQ_WORK_UNBOUND = 4, - IO_WQ_WORK_CONCURRENT = 16, - - IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */ -}; - -enum io_wq_cancel { - IO_WQ_CANCEL_OK, /* cancelled before started */ - IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */ - IO_WQ_CANCEL_NOTFOUND, /* work not found */ -}; - -struct io_wq_work_node { - struct io_wq_work_node *next; -}; - -struct io_wq_work_list { - struct io_wq_work_node *first; - struct io_wq_work_node *last; -}; - -static inline void wq_list_add_after(struct io_wq_work_node *node, - struct io_wq_work_node *pos, - struct io_wq_work_list *list) -{ - struct io_wq_work_node *next = pos->next; - - pos->next = node; - node->next = next; - if (!next) - list->last = node; -} - -static inline void wq_list_add_tail(struct io_wq_work_node *node, - struct io_wq_work_list *list) -{ - node->next = NULL; - if (!list->first) { - list->last = node; - WRITE_ONCE(list->first, node); - } else { - list->last->next = node; - list->last = node; - } -} - -static inline void wq_list_cut(struct io_wq_work_list *list, - struct io_wq_work_node *last, - struct io_wq_work_node *prev) -{ - /* first in the list, if prev==NULL */ - if (!prev) - WRITE_ONCE(list->first, last->next); - else - prev->next = last->next; - - if (last == list->last) - list->last = prev; - last->next = NULL; -} - -static inline void wq_list_del(struct io_wq_work_list *list, - struct io_wq_work_node *node, - struct io_wq_work_node *prev) -{ - wq_list_cut(list, node, prev); -} - -#define wq_list_for_each(pos, prv, head) \ - for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next) - -#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL) -#define INIT_WQ_LIST(list) do { \ - (list)->first = NULL; \ - (list)->last = NULL; \ -} while (0) - -struct io_wq_work { - struct io_wq_work_node list; - unsigned flags; -}; - -static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) -{ - if (!work->list.next) - return NULL; - - return container_of(work->list.next, struct io_wq_work, list); -} - -typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *); -typedef void (io_wq_work_fn)(struct io_wq_work *); - -struct io_wq_hash { - refcount_t refs; - unsigned long map; - struct wait_queue_head wait; -}; - -static inline void io_wq_put_hash(struct io_wq_hash *hash) -{ - if (refcount_dec_and_test(&hash->refs)) - kfree(hash); -} - -struct io_wq_data { - struct io_wq_hash *hash; - struct task_struct *task; - io_wq_work_fn *do_work; - free_work_fn *free_work; -}; - -struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); -void io_wq_exit_start(struct io_wq *wq); -void io_wq_put_and_exit(struct io_wq *wq); - -void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); -void io_wq_hash_work(struct io_wq_work *work, void *val); - -int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask); -int io_wq_max_workers(struct io_wq *wq, int *new_count); - -static inline bool io_wq_is_hashed(struct io_wq_work *work) -{ - return work->flags & IO_WQ_WORK_HASHED; -} - -typedef bool (work_cancel_fn)(struct io_wq_work *, void *); - -enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, - void *data, bool cancel_all); - -#if defined(CONFIG_IO_WQ) -extern void io_wq_worker_sleeping(struct task_struct *); -extern void io_wq_worker_running(struct task_struct *); -#else -static inline void io_wq_worker_sleeping(struct task_struct *tsk) -{ -} -static inline void io_wq_worker_running(struct task_struct *tsk) -{ -} -#endif - -static inline bool io_wq_current_is_worker(void) -{ - return in_task() && (current->flags & PF_IO_WORKER) && - current->pf_io_worker; -} -#endif diff --git a/fs/io_uring.c b/fs/io_uring.c deleted file mode 100644 index c2fdde6fdda38..0000000000000 --- a/fs/io_uring.c +++ /dev/null @@ -1,11110 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Shared application/kernel submission and completion ring pairs, for - * supporting fast/efficient IO. - * - * A note on the read/write ordering memory barriers that are matched between - * the application and kernel side. - * - * After the application reads the CQ ring tail, it must use an - * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses - * before writing the tail (using smp_load_acquire to read the tail will - * do). It also needs a smp_mb() before updating CQ head (ordering the - * entry load(s) with the head store), pairing with an implicit barrier - * through a control-dependency in io_get_cqe (smp_store_release to - * store head will do). Failure to do so could lead to reading invalid - * CQ entries. - * - * Likewise, the application must use an appropriate smp_wmb() before - * writing the SQ tail (ordering SQ entry stores with the tail store), - * which pairs with smp_load_acquire in io_get_sqring (smp_store_release - * to store the tail will do). And it needs a barrier ordering the SQ - * head load before writing new SQ entries (smp_load_acquire to read - * head will do). - * - * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application - * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* - * updating the SQ tail; a full memory barrier smp_mb() is needed - * between. - * - * Also see the examples in the liburing library: - * - * git://git.kernel.dk/liburing - * - * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens - * from data shared between the kernel and application. This is done both - * for ordering purposes, but also to ensure that once a value is loaded from - * data that the application could potentially modify, it remains stable. - * - * Copyright (C) 2018-2019 Jens Axboe - * Copyright (c) 2018-2019 Christoph Hellwig - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define CREATE_TRACE_POINTS -#include - -#include - -#include "internal.h" -#include "io-wq.h" - -#define IORING_MAX_ENTRIES 32768 -#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) -#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 - -/* only define max */ -#define IORING_MAX_FIXED_FILES (1U << 15) -#define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ - IORING_REGISTER_LAST + IORING_OP_LAST) - -#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) -#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) -#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) - -#define IORING_MAX_REG_BUFFERS (1U << 14) - -#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ - IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ - IOSQE_BUFFER_SELECT) -#define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ - REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) - -#define IO_TCTX_REFS_CACHE_NR (1U << 10) - -struct io_uring { - u32 head ____cacheline_aligned_in_smp; - u32 tail ____cacheline_aligned_in_smp; -}; - -/* - * This data is shared with the application through the mmap at offsets - * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. - * - * The offsets to the member fields are published through struct - * io_sqring_offsets when calling io_uring_setup. - */ -struct io_rings { - /* - * Head and tail offsets into the ring; the offsets need to be - * masked to get valid indices. - * - * The kernel controls head of the sq ring and the tail of the cq ring, - * and the application controls tail of the sq ring and the head of the - * cq ring. - */ - struct io_uring sq, cq; - /* - * Bitmasks to apply to head and tail offsets (constant, equals - * ring_entries - 1) - */ - u32 sq_ring_mask, cq_ring_mask; - /* Ring sizes (constant, power of 2) */ - u32 sq_ring_entries, cq_ring_entries; - /* - * Number of invalid entries dropped by the kernel due to - * invalid index stored in array - * - * Written by the kernel, shouldn't be modified by the - * application (i.e. get number of "new events" by comparing to - * cached value). - * - * After a new SQ head value was read by the application this - * counter includes all submissions that were dropped reaching - * the new SQ head (and possibly more). - */ - u32 sq_dropped; - /* - * Runtime SQ flags - * - * Written by the kernel, shouldn't be modified by the - * application. - * - * The application needs a full memory barrier before checking - * for IORING_SQ_NEED_WAKEUP after updating the sq tail. - */ - u32 sq_flags; - /* - * Runtime CQ flags - * - * Written by the application, shouldn't be modified by the - * kernel. - */ - u32 cq_flags; - /* - * Number of completion events lost because the queue was full; - * this should be avoided by the application by making sure - * there are not more requests pending than there is space in - * the completion queue. - * - * Written by the kernel, shouldn't be modified by the - * application (i.e. get number of "new events" by comparing to - * cached value). - * - * As completion events come in out of order this counter is not - * ordered with any other data. - */ - u32 cq_overflow; - /* - * Ring buffer of completion events. - * - * The kernel writes completion events fresh every time they are - * produced, so the application is allowed to modify pending - * entries. - */ - struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; -}; - -enum io_uring_cmd_flags { - IO_URING_F_NONBLOCK = 1, - IO_URING_F_COMPLETE_DEFER = 2, -}; - -struct io_mapped_ubuf { - u64 ubuf; - u64 ubuf_end; - unsigned int nr_bvecs; - unsigned long acct_pages; - struct bio_vec bvec[]; -}; - -struct io_ring_ctx; - -struct io_overflow_cqe { - struct io_uring_cqe cqe; - struct list_head list; -}; - -struct io_fixed_file { - /* file * with additional FFS_* flags */ - unsigned long file_ptr; -}; - -struct io_rsrc_put { - struct list_head list; - u64 tag; - union { - void *rsrc; - struct file *file; - struct io_mapped_ubuf *buf; - }; -}; - -struct io_file_table { - struct io_fixed_file *files; -}; - -struct io_rsrc_node { - struct percpu_ref refs; - struct list_head node; - struct list_head rsrc_list; - struct io_rsrc_data *rsrc_data; - struct llist_node llist; - bool done; -}; - -typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); - -struct io_rsrc_data { - struct io_ring_ctx *ctx; - - u64 **tags; - unsigned int nr; - rsrc_put_fn *do_put; - atomic_t refs; - struct completion done; - bool quiesce; -}; - -struct io_buffer { - struct list_head list; - __u64 addr; - __u32 len; - __u16 bid; -}; - -struct io_restriction { - DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); - DECLARE_BITMAP(sqe_op, IORING_OP_LAST); - u8 sqe_flags_allowed; - u8 sqe_flags_required; - bool registered; -}; - -enum { - IO_SQ_THREAD_SHOULD_STOP = 0, - IO_SQ_THREAD_SHOULD_PARK, -}; - -struct io_sq_data { - refcount_t refs; - atomic_t park_pending; - struct mutex lock; - - /* ctx's that are using this sqd */ - struct list_head ctx_list; - - struct task_struct *thread; - struct wait_queue_head wait; - - unsigned sq_thread_idle; - int sq_cpu; - pid_t task_pid; - pid_t task_tgid; - - unsigned long state; - struct completion exited; -}; - -#define IO_COMPL_BATCH 32 -#define IO_REQ_CACHE_SIZE 32 -#define IO_REQ_ALLOC_BATCH 8 - -struct io_submit_link { - struct io_kiocb *head; - struct io_kiocb *last; -}; - -struct io_submit_state { - struct blk_plug plug; - struct io_submit_link link; - - /* - * io_kiocb alloc cache - */ - void *reqs[IO_REQ_CACHE_SIZE]; - unsigned int free_reqs; - - bool plug_started; - - /* - * Batch completion logic - */ - struct io_kiocb *compl_reqs[IO_COMPL_BATCH]; - unsigned int compl_nr; - /* inline/task_work completion list, under ->uring_lock */ - struct list_head free_list; - - unsigned int ios_left; -}; - -struct io_ring_ctx { - /* const or read-mostly hot data */ - struct { - struct percpu_ref refs; - - struct io_rings *rings; - unsigned int flags; - unsigned int compat: 1; - unsigned int drain_next: 1; - unsigned int eventfd_async: 1; - unsigned int restricted: 1; - unsigned int off_timeout_used: 1; - unsigned int drain_active: 1; - } ____cacheline_aligned_in_smp; - - /* submission data */ - struct { - struct mutex uring_lock; - - /* - * Ring buffer of indices into array of io_uring_sqe, which is - * mmapped by the application using the IORING_OFF_SQES offset. - * - * This indirection could e.g. be used to assign fixed - * io_uring_sqe entries to operations and only submit them to - * the queue when needed. - * - * The kernel modifies neither the indices array nor the entries - * array. - */ - u32 *sq_array; - struct io_uring_sqe *sq_sqes; - unsigned cached_sq_head; - unsigned sq_entries; - struct list_head defer_list; - - /* - * Fixed resources fast path, should be accessed only under - * uring_lock, and updated through io_uring_register(2) - */ - struct io_rsrc_node *rsrc_node; - struct io_file_table file_table; - unsigned nr_user_files; - unsigned nr_user_bufs; - struct io_mapped_ubuf **user_bufs; - - struct io_submit_state submit_state; - struct list_head timeout_list; - struct list_head ltimeout_list; - struct list_head cq_overflow_list; - struct xarray io_buffers; - struct xarray personalities; - u32 pers_next; - unsigned sq_thread_idle; - } ____cacheline_aligned_in_smp; - - /* IRQ completion list, under ->completion_lock */ - struct list_head locked_free_list; - unsigned int locked_free_nr; - - const struct cred *sq_creds; /* cred used for __io_sq_thread() */ - struct io_sq_data *sq_data; /* if using sq thread polling */ - - struct wait_queue_head sqo_sq_wait; - struct list_head sqd_list; - - unsigned long check_cq_overflow; - - struct { - unsigned cached_cq_tail; - unsigned cq_entries; - struct eventfd_ctx *cq_ev_fd; - struct wait_queue_head poll_wait; - struct wait_queue_head cq_wait; - unsigned cq_extra; - atomic_t cq_timeouts; - unsigned cq_last_tm_flush; - } ____cacheline_aligned_in_smp; - - struct { - spinlock_t completion_lock; - - spinlock_t timeout_lock; - - /* - * ->iopoll_list is protected by the ctx->uring_lock for - * io_uring instances that don't use IORING_SETUP_SQPOLL. - * For SQPOLL, only the single threaded io_sq_thread() will - * manipulate the list, hence no extra locking is needed there. - */ - struct list_head iopoll_list; - struct hlist_head *cancel_hash; - unsigned cancel_hash_bits; - bool poll_multi_queue; - } ____cacheline_aligned_in_smp; - - struct io_restriction restrictions; - - /* slow path rsrc auxilary data, used by update/register */ - struct { - struct io_rsrc_node *rsrc_backup_node; - struct io_mapped_ubuf *dummy_ubuf; - struct io_rsrc_data *file_data; - struct io_rsrc_data *buf_data; - - struct delayed_work rsrc_put_work; - struct llist_head rsrc_put_llist; - struct list_head rsrc_ref_list; - spinlock_t rsrc_ref_lock; - }; - - /* Keep this last, we don't need it for the fast path */ - struct { - #if defined(CONFIG_UNIX) - struct socket *ring_sock; - #endif - /* hashed buffered write serialization */ - struct io_wq_hash *hash_map; - - /* Only used for accounting purposes */ - struct user_struct *user; - struct mm_struct *mm_account; - - /* ctx exit and cancelation */ - struct llist_head fallback_llist; - struct delayed_work fallback_work; - struct work_struct exit_work; - struct list_head tctx_list; - struct completion ref_comp; - u32 iowq_limits[2]; - bool iowq_limits_set; - }; -}; - -struct io_uring_task { - /* submission side */ - int cached_refs; - struct xarray xa; - struct wait_queue_head wait; - const struct io_ring_ctx *last; - struct io_wq *io_wq; - struct percpu_counter inflight; - atomic_t inflight_tracked; - atomic_t in_idle; - - spinlock_t task_lock; - struct io_wq_work_list task_list; - struct callback_head task_work; - bool task_running; -}; - -/* - * First field must be the file pointer in all the - * iocb unions! See also 'struct kiocb' in - */ -struct io_poll_iocb { - struct file *file; - struct wait_queue_head *head; - __poll_t events; - struct wait_queue_entry wait; -}; - -struct io_poll_update { - struct file *file; - u64 old_user_data; - u64 new_user_data; - __poll_t events; - bool update_events; - bool update_user_data; -}; - -struct io_close { - struct file *file; - int fd; - u32 file_slot; -}; - -struct io_timeout_data { - struct io_kiocb *req; - struct hrtimer timer; - struct timespec64 ts; - enum hrtimer_mode mode; - u32 flags; -}; - -struct io_accept { - struct file *file; - struct sockaddr __user *addr; - int __user *addr_len; - int flags; - u32 file_slot; - unsigned long nofile; -}; - -struct io_sync { - struct file *file; - loff_t len; - loff_t off; - int flags; - int mode; -}; - -struct io_cancel { - struct file *file; - u64 addr; -}; - -struct io_timeout { - struct file *file; - u32 off; - u32 target_seq; - struct list_head list; - /* head of the link, used by linked timeouts only */ - struct io_kiocb *head; - /* for linked completions */ - struct io_kiocb *prev; -}; - -struct io_timeout_rem { - struct file *file; - u64 addr; - - /* timeout update */ - struct timespec64 ts; - u32 flags; - bool ltimeout; -}; - -struct io_rw { - /* NOTE: kiocb has the file as the first member, so don't do it here */ - struct kiocb kiocb; - u64 addr; - u64 len; -}; - -struct io_connect { - struct file *file; - struct sockaddr __user *addr; - int addr_len; -}; - -struct io_sr_msg { - struct file *file; - union { - struct compat_msghdr __user *umsg_compat; - struct user_msghdr __user *umsg; - void __user *buf; - }; - int msg_flags; - int bgid; - size_t len; - struct io_buffer *kbuf; -}; - -struct io_open { - struct file *file; - int dfd; - u32 file_slot; - struct filename *filename; - struct open_how how; - unsigned long nofile; -}; - -struct io_rsrc_update { - struct file *file; - u64 arg; - u32 nr_args; - u32 offset; -}; - -struct io_fadvise { - struct file *file; - u64 offset; - u32 len; - u32 advice; -}; - -struct io_madvise { - struct file *file; - u64 addr; - u32 len; - u32 advice; -}; - -struct io_epoll { - struct file *file; - int epfd; - int op; - int fd; - struct epoll_event event; -}; - -struct io_splice { - struct file *file_out; - loff_t off_out; - loff_t off_in; - u64 len; - int splice_fd_in; - unsigned int flags; -}; - -struct io_provide_buf { - struct file *file; - __u64 addr; - __u32 len; - __u32 bgid; - __u16 nbufs; - __u16 bid; -}; - -struct io_statx { - struct file *file; - int dfd; - unsigned int mask; - unsigned int flags; - const char __user *filename; - struct statx __user *buffer; -}; - -struct io_shutdown { - struct file *file; - int how; -}; - -struct io_rename { - struct file *file; - int old_dfd; - int new_dfd; - struct filename *oldpath; - struct filename *newpath; - int flags; -}; - -struct io_unlink { - struct file *file; - int dfd; - int flags; - struct filename *filename; -}; - -struct io_mkdir { - struct file *file; - int dfd; - umode_t mode; - struct filename *filename; -}; - -struct io_symlink { - struct file *file; - int new_dfd; - struct filename *oldpath; - struct filename *newpath; -}; - -struct io_hardlink { - struct file *file; - int old_dfd; - int new_dfd; - struct filename *oldpath; - struct filename *newpath; - int flags; -}; - -struct io_completion { - struct file *file; - u32 cflags; -}; - -struct io_async_connect { - struct sockaddr_storage address; -}; - -struct io_async_msghdr { - struct iovec fast_iov[UIO_FASTIOV]; - /* points to an allocated iov, if NULL we use fast_iov instead */ - struct iovec *free_iov; - struct sockaddr __user *uaddr; - struct msghdr msg; - struct sockaddr_storage addr; -}; - -struct io_async_rw { - struct iovec fast_iov[UIO_FASTIOV]; - const struct iovec *free_iovec; - struct iov_iter iter; - struct iov_iter_state iter_state; - size_t bytes_done; - struct wait_page_queue wpq; -}; - -enum { - REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, - REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, - REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, - REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, - REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, - REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, - - /* first byte is taken by user flags, shift it to not overlap */ - REQ_F_FAIL_BIT = 8, - REQ_F_INFLIGHT_BIT, - REQ_F_CUR_POS_BIT, - REQ_F_NOWAIT_BIT, - REQ_F_LINK_TIMEOUT_BIT, - REQ_F_NEED_CLEANUP_BIT, - REQ_F_POLLED_BIT, - REQ_F_BUFFER_SELECTED_BIT, - REQ_F_COMPLETE_INLINE_BIT, - REQ_F_REISSUE_BIT, - REQ_F_CREDS_BIT, - REQ_F_REFCOUNT_BIT, - REQ_F_ARM_LTIMEOUT_BIT, - /* keep async read/write and isreg together and in order */ - REQ_F_NOWAIT_READ_BIT, - REQ_F_NOWAIT_WRITE_BIT, - REQ_F_ISREG_BIT, - - /* not a real bit, just to check we're not overflowing the space */ - __REQ_F_LAST_BIT, -}; - -enum { - /* ctx owns file */ - REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), - /* drain existing IO first */ - REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), - /* linked sqes */ - REQ_F_LINK = BIT(REQ_F_LINK_BIT), - /* doesn't sever on completion < 0 */ - REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), - /* IOSQE_ASYNC */ - REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), - /* IOSQE_BUFFER_SELECT */ - REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), - - /* fail rest of links */ - REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), - /* on inflight list, should be cancelled and waited on exit reliably */ - REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), - /* read/write uses file position */ - REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), - /* must not punt to workers */ - REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), - /* has or had linked timeout */ - REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), - /* needs cleanup */ - REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), - /* already went through poll handler */ - REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), - /* buffer already selected */ - REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), - /* completion is deferred through io_comp_state */ - REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), - /* caller should reissue async */ - REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), - /* supports async reads */ - REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), - /* supports async writes */ - REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), - /* regular file */ - REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), - /* has creds assigned */ - REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), - /* skip refcounting if not set */ - REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), - /* there is a linked timeout that has to be armed */ - REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), -}; - -struct async_poll { - struct io_poll_iocb poll; - struct io_poll_iocb *double_poll; -}; - -typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); - -struct io_task_work { - union { - struct io_wq_work_node node; - struct llist_node fallback_node; - }; - io_req_tw_func_t func; -}; - -enum { - IORING_RSRC_FILE = 0, - IORING_RSRC_BUFFER = 1, -}; - -/* - * NOTE! Each of the iocb union members has the file pointer - * as the first entry in their struct definition. So you can - * access the file pointer through any of the sub-structs, - * or directly as just 'ki_filp' in this struct. - */ -struct io_kiocb { - union { - struct file *file; - struct io_rw rw; - struct io_poll_iocb poll; - struct io_poll_update poll_update; - struct io_accept accept; - struct io_sync sync; - struct io_cancel cancel; - struct io_timeout timeout; - struct io_timeout_rem timeout_rem; - struct io_connect connect; - struct io_sr_msg sr_msg; - struct io_open open; - struct io_close close; - struct io_rsrc_update rsrc_update; - struct io_fadvise fadvise; - struct io_madvise madvise; - struct io_epoll epoll; - struct io_splice splice; - struct io_provide_buf pbuf; - struct io_statx statx; - struct io_shutdown shutdown; - struct io_rename rename; - struct io_unlink unlink; - struct io_mkdir mkdir; - struct io_symlink symlink; - struct io_hardlink hardlink; - /* use only after cleaning per-op data, see io_clean_op() */ - struct io_completion compl; - }; - - /* opcode allocated if it needs to store data for async defer */ - void *async_data; - u8 opcode; - /* polled IO has completed */ - u8 iopoll_completed; - - u16 buf_index; - u32 result; - - struct io_ring_ctx *ctx; - unsigned int flags; - atomic_t refs; - struct task_struct *task; - u64 user_data; - - struct io_kiocb *link; - struct percpu_ref *fixed_rsrc_refs; - - /* used with ctx->iopoll_list with reads/writes */ - struct list_head inflight_entry; - struct io_task_work io_task_work; - /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ - struct hlist_node hash_node; - struct async_poll *apoll; - struct io_wq_work work; - const struct cred *creds; - - /* store used ubuf, so we can prevent reloading */ - struct io_mapped_ubuf *imu; - /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ - struct io_buffer *kbuf; - atomic_t poll_refs; -}; - -struct io_tctx_node { - struct list_head ctx_node; - struct task_struct *task; - struct io_ring_ctx *ctx; -}; - -struct io_defer_entry { - struct list_head list; - struct io_kiocb *req; - u32 seq; -}; - -struct io_op_def { - /* needs req->file assigned */ - unsigned needs_file : 1; - /* hash wq insertion if file is a regular file */ - unsigned hash_reg_file : 1; - /* unbound wq insertion if file is a non-regular file */ - unsigned unbound_nonreg_file : 1; - /* opcode is not supported by this kernel */ - unsigned not_supported : 1; - /* set if opcode supports polled "wait" */ - unsigned pollin : 1; - unsigned pollout : 1; - /* op supports buffer selection */ - unsigned buffer_select : 1; - /* do prep async if is going to be punted */ - unsigned needs_async_setup : 1; - /* should block plug */ - unsigned plug : 1; - /* size of async data needed, if any */ - unsigned short async_size; -}; - -static const struct io_op_def io_op_defs[] = { - [IORING_OP_NOP] = {}, - [IORING_OP_READV] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - .buffer_select = 1, - .needs_async_setup = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_WRITEV] = { - .needs_file = 1, - .hash_reg_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - .needs_async_setup = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_FSYNC] = { - .needs_file = 1, - }, - [IORING_OP_READ_FIXED] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_WRITE_FIXED] = { - .needs_file = 1, - .hash_reg_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_POLL_ADD] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - }, - [IORING_OP_POLL_REMOVE] = {}, - [IORING_OP_SYNC_FILE_RANGE] = { - .needs_file = 1, - }, - [IORING_OP_SENDMSG] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - .needs_async_setup = 1, - .async_size = sizeof(struct io_async_msghdr), - }, - [IORING_OP_RECVMSG] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - .buffer_select = 1, - .needs_async_setup = 1, - .async_size = sizeof(struct io_async_msghdr), - }, - [IORING_OP_TIMEOUT] = { - .async_size = sizeof(struct io_timeout_data), - }, - [IORING_OP_TIMEOUT_REMOVE] = { - /* used by timeout updates' prep() */ - }, - [IORING_OP_ACCEPT] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - }, - [IORING_OP_ASYNC_CANCEL] = {}, - [IORING_OP_LINK_TIMEOUT] = { - .async_size = sizeof(struct io_timeout_data), - }, - [IORING_OP_CONNECT] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - .needs_async_setup = 1, - .async_size = sizeof(struct io_async_connect), - }, - [IORING_OP_FALLOCATE] = { - .needs_file = 1, - }, - [IORING_OP_OPENAT] = {}, - [IORING_OP_CLOSE] = {}, - [IORING_OP_FILES_UPDATE] = {}, - [IORING_OP_STATX] = {}, - [IORING_OP_READ] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - .buffer_select = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_WRITE] = { - .needs_file = 1, - .hash_reg_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - .plug = 1, - .async_size = sizeof(struct io_async_rw), - }, - [IORING_OP_FADVISE] = { - .needs_file = 1, - }, - [IORING_OP_MADVISE] = {}, - [IORING_OP_SEND] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollout = 1, - }, - [IORING_OP_RECV] = { - .needs_file = 1, - .unbound_nonreg_file = 1, - .pollin = 1, - .buffer_select = 1, - }, - [IORING_OP_OPENAT2] = { - }, - [IORING_OP_EPOLL_CTL] = { - .unbound_nonreg_file = 1, - }, - [IORING_OP_SPLICE] = { - .needs_file = 1, - .hash_reg_file = 1, - .unbound_nonreg_file = 1, - }, - [IORING_OP_PROVIDE_BUFFERS] = {}, - [IORING_OP_REMOVE_BUFFERS] = {}, - [IORING_OP_TEE] = { - .needs_file = 1, - .hash_reg_file = 1, - .unbound_nonreg_file = 1, - }, - [IORING_OP_SHUTDOWN] = { - .needs_file = 1, - }, - [IORING_OP_RENAMEAT] = {}, - [IORING_OP_UNLINKAT] = {}, - [IORING_OP_MKDIRAT] = {}, - [IORING_OP_SYMLINKAT] = {}, - [IORING_OP_LINKAT] = {}, -}; - -/* requests with any of those set should undergo io_disarm_next() */ -#define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) - -static bool io_disarm_next(struct io_kiocb *req); -static void io_uring_del_tctx_node(unsigned long index); -static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, - struct task_struct *task, - bool cancel_all); -static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); - -static void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags); - -static void io_put_req(struct io_kiocb *req); -static void io_put_req_deferred(struct io_kiocb *req); -static void io_dismantle_req(struct io_kiocb *req); -static void io_queue_linked_timeout(struct io_kiocb *req); -static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, - struct io_uring_rsrc_update2 *up, - unsigned nr_args); -static void io_clean_op(struct io_kiocb *req); -static struct file *io_file_get(struct io_ring_ctx *ctx, - struct io_kiocb *req, int fd, bool fixed); -static void __io_queue_sqe(struct io_kiocb *req); -static void io_rsrc_put_work(struct work_struct *work); - -static void io_req_task_queue(struct io_kiocb *req); -static void io_submit_flush_completions(struct io_ring_ctx *ctx); -static int io_req_prep_async(struct io_kiocb *req); - -static int io_install_fixed_file(struct io_kiocb *req, struct file *file, - unsigned int issue_flags, u32 slot_index); -static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); - -static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); - -static struct kmem_cache *req_cachep; - -static const struct file_operations io_uring_fops; - -struct sock *io_uring_get_socket(struct file *file) -{ -#if defined(CONFIG_UNIX) - if (file->f_op == &io_uring_fops) { - struct io_ring_ctx *ctx = file->private_data; - - return ctx->ring_sock->sk; - } -#endif - return NULL; -} -EXPORT_SYMBOL(io_uring_get_socket); - -static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) -{ - if (!*locked) { - mutex_lock(&ctx->uring_lock); - *locked = true; - } -} - -#define io_for_each_link(pos, head) \ - for (pos = (head); pos; pos = pos->link) - -/* - * Shamelessly stolen from the mm implementation of page reference checking, - * see commit f958d7b528b1 for details. - */ -#define req_ref_zero_or_close_to_overflow(req) \ - ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) - -static inline bool req_ref_inc_not_zero(struct io_kiocb *req) -{ - WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); - return atomic_inc_not_zero(&req->refs); -} - -static inline bool req_ref_put_and_test(struct io_kiocb *req) -{ - if (likely(!(req->flags & REQ_F_REFCOUNT))) - return true; - - WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); - return atomic_dec_and_test(&req->refs); -} - -static inline void req_ref_get(struct io_kiocb *req) -{ - WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); - WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); - atomic_inc(&req->refs); -} - -static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) -{ - if (!(req->flags & REQ_F_REFCOUNT)) { - req->flags |= REQ_F_REFCOUNT; - atomic_set(&req->refs, nr); - } -} - -static inline void io_req_set_refcount(struct io_kiocb *req) -{ - __io_req_set_refcount(req, 1); -} - -static inline void io_req_set_rsrc_node(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - - if (!req->fixed_rsrc_refs) { - req->fixed_rsrc_refs = &ctx->rsrc_node->refs; - percpu_ref_get(req->fixed_rsrc_refs); - } -} - -static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) -{ - bool got = percpu_ref_tryget(ref); - - /* already at zero, wait for ->release() */ - if (!got) - wait_for_completion(compl); - percpu_ref_resurrect(ref); - if (got) - percpu_ref_put(ref); -} - -static bool io_match_task(struct io_kiocb *head, struct task_struct *task, - bool cancel_all) - __must_hold(&req->ctx->timeout_lock) -{ - struct io_kiocb *req; - - if (task && head->task != task) - return false; - if (cancel_all) - return true; - - io_for_each_link(req, head) { - if (req->flags & REQ_F_INFLIGHT) - return true; - } - return false; -} - -static bool io_match_linked(struct io_kiocb *head) -{ - struct io_kiocb *req; - - io_for_each_link(req, head) { - if (req->flags & REQ_F_INFLIGHT) - return true; - } - return false; -} - -/* - * As io_match_task() but protected against racing with linked timeouts. - * User must not hold timeout_lock. - */ -static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, - bool cancel_all) -{ - bool matched; - - if (task && head->task != task) - return false; - if (cancel_all) - return true; - - if (head->flags & REQ_F_LINK_TIMEOUT) { - struct io_ring_ctx *ctx = head->ctx; - - /* protect against races with linked timeouts */ - spin_lock_irq(&ctx->timeout_lock); - matched = io_match_linked(head); - spin_unlock_irq(&ctx->timeout_lock); - } else { - matched = io_match_linked(head); - } - return matched; -} - -static inline void req_set_fail(struct io_kiocb *req) -{ - req->flags |= REQ_F_FAIL; -} - -static inline void req_fail_link_node(struct io_kiocb *req, int res) -{ - req_set_fail(req); - req->result = res; -} - -static void io_ring_ctx_ref_free(struct percpu_ref *ref) -{ - struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); - - complete(&ctx->ref_comp); -} - -static inline bool io_is_timeout_noseq(struct io_kiocb *req) -{ - return !req->timeout.off; -} - -static void io_fallback_req_func(struct work_struct *work) -{ - struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, - fallback_work.work); - struct llist_node *node = llist_del_all(&ctx->fallback_llist); - struct io_kiocb *req, *tmp; - bool locked = false; - - percpu_ref_get(&ctx->refs); - llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) - req->io_task_work.func(req, &locked); - - if (locked) { - if (ctx->submit_state.compl_nr) - io_submit_flush_completions(ctx); - mutex_unlock(&ctx->uring_lock); - } - percpu_ref_put(&ctx->refs); - -} - -static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) -{ - struct io_ring_ctx *ctx; - int hash_bits; - - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); - if (!ctx) - return NULL; - - /* - * Use 5 bits less than the max cq entries, that should give us around - * 32 entries per hash list if totally full and uniformly spread. - */ - hash_bits = ilog2(p->cq_entries); - hash_bits -= 5; - if (hash_bits <= 0) - hash_bits = 1; - ctx->cancel_hash_bits = hash_bits; - ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), - GFP_KERNEL); - if (!ctx->cancel_hash) - goto err; - __hash_init(ctx->cancel_hash, 1U << hash_bits); - - ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); - if (!ctx->dummy_ubuf) - goto err; - /* set invalid range, so io_import_fixed() fails meeting it */ - ctx->dummy_ubuf->ubuf = -1UL; - - if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, - PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) - goto err; - - ctx->flags = p->flags; - init_waitqueue_head(&ctx->sqo_sq_wait); - INIT_LIST_HEAD(&ctx->sqd_list); - init_waitqueue_head(&ctx->poll_wait); - INIT_LIST_HEAD(&ctx->cq_overflow_list); - init_completion(&ctx->ref_comp); - xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); - xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); - mutex_init(&ctx->uring_lock); - init_waitqueue_head(&ctx->cq_wait); - spin_lock_init(&ctx->completion_lock); - spin_lock_init(&ctx->timeout_lock); - INIT_LIST_HEAD(&ctx->iopoll_list); - INIT_LIST_HEAD(&ctx->defer_list); - INIT_LIST_HEAD(&ctx->timeout_list); - INIT_LIST_HEAD(&ctx->ltimeout_list); - spin_lock_init(&ctx->rsrc_ref_lock); - INIT_LIST_HEAD(&ctx->rsrc_ref_list); - INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); - init_llist_head(&ctx->rsrc_put_llist); - INIT_LIST_HEAD(&ctx->tctx_list); - INIT_LIST_HEAD(&ctx->submit_state.free_list); - INIT_LIST_HEAD(&ctx->locked_free_list); - INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); - return ctx; -err: - kfree(ctx->dummy_ubuf); - kfree(ctx->cancel_hash); - kfree(ctx); - return NULL; -} - -static void io_account_cq_overflow(struct io_ring_ctx *ctx) -{ - struct io_rings *r = ctx->rings; - - WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); - ctx->cq_extra--; -} - -static bool req_need_defer(struct io_kiocb *req, u32 seq) -{ - if (unlikely(req->flags & REQ_F_IO_DRAIN)) { - struct io_ring_ctx *ctx = req->ctx; - - return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; - } - - return false; -} - -#define FFS_ASYNC_READ 0x1UL -#define FFS_ASYNC_WRITE 0x2UL -#ifdef CONFIG_64BIT -#define FFS_ISREG 0x4UL -#else -#define FFS_ISREG 0x0UL -#endif -#define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) - -static inline bool io_req_ffs_set(struct io_kiocb *req) -{ - return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); -} - -static void io_req_track_inflight(struct io_kiocb *req) -{ - if (!(req->flags & REQ_F_INFLIGHT)) { - req->flags |= REQ_F_INFLIGHT; - atomic_inc(&req->task->io_uring->inflight_tracked); - } -} - -static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) -{ - if (WARN_ON_ONCE(!req->link)) - return NULL; - - req->flags &= ~REQ_F_ARM_LTIMEOUT; - req->flags |= REQ_F_LINK_TIMEOUT; - - /* linked timeouts should have two refs once prep'ed */ - io_req_set_refcount(req); - __io_req_set_refcount(req->link, 2); - return req->link; -} - -static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) -{ - if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) - return NULL; - return __io_prep_linked_timeout(req); -} - -static void io_prep_async_work(struct io_kiocb *req) -{ - const struct io_op_def *def = &io_op_defs[req->opcode]; - struct io_ring_ctx *ctx = req->ctx; - - if (!(req->flags & REQ_F_CREDS)) { - req->flags |= REQ_F_CREDS; - req->creds = get_current_cred(); - } - - req->work.list.next = NULL; - req->work.flags = 0; - if (req->flags & REQ_F_FORCE_ASYNC) - req->work.flags |= IO_WQ_WORK_CONCURRENT; - - if (req->flags & REQ_F_ISREG) { - if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) - io_wq_hash_work(&req->work, file_inode(req->file)); - } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { - if (def->unbound_nonreg_file) - req->work.flags |= IO_WQ_WORK_UNBOUND; - } -} - -static void io_prep_async_link(struct io_kiocb *req) -{ - struct io_kiocb *cur; - - if (req->flags & REQ_F_LINK_TIMEOUT) { - struct io_ring_ctx *ctx = req->ctx; - - spin_lock_irq(&ctx->timeout_lock); - io_for_each_link(cur, req) - io_prep_async_work(cur); - spin_unlock_irq(&ctx->timeout_lock); - } else { - io_for_each_link(cur, req) - io_prep_async_work(cur); - } -} - -static void io_queue_async_work(struct io_kiocb *req, bool *locked) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_kiocb *link = io_prep_linked_timeout(req); - struct io_uring_task *tctx = req->task->io_uring; - - /* must not take the lock, NULL it as a precaution */ - locked = NULL; - - BUG_ON(!tctx); - BUG_ON(!tctx->io_wq); - - /* init ->work of the whole link before punting */ - io_prep_async_link(req); - - /* - * Not expected to happen, but if we do have a bug where this _can_ - * happen, catch it here and ensure the request is marked as - * canceled. That will make io-wq go through the usual work cancel - * procedure rather than attempt to run this request (or create a new - * worker for it). - */ - if (WARN_ON_ONCE(!same_thread_group(req->task, current))) - req->work.flags |= IO_WQ_WORK_CANCEL; - - trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, - &req->work, req->flags); - io_wq_enqueue(tctx->io_wq, &req->work); - if (link) - io_queue_linked_timeout(link); -} - -static void io_kill_timeout(struct io_kiocb *req, int status) - __must_hold(&req->ctx->completion_lock) - __must_hold(&req->ctx->timeout_lock) -{ - struct io_timeout_data *io = req->async_data; - - if (hrtimer_try_to_cancel(&io->timer) != -1) { - if (status) - req_set_fail(req); - atomic_set(&req->ctx->cq_timeouts, - atomic_read(&req->ctx->cq_timeouts) + 1); - list_del_init(&req->timeout.list); - io_fill_cqe_req(req, status, 0); - io_put_req_deferred(req); - } -} - -static void io_queue_deferred(struct io_ring_ctx *ctx) -{ - while (!list_empty(&ctx->defer_list)) { - struct io_defer_entry *de = list_first_entry(&ctx->defer_list, - struct io_defer_entry, list); - - if (req_need_defer(de->req, de->seq)) - break; - list_del_init(&de->list); - io_req_task_queue(de->req); - kfree(de); - } -} - -static void io_flush_timeouts(struct io_ring_ctx *ctx) - __must_hold(&ctx->completion_lock) -{ - u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); - struct io_kiocb *req, *tmp; - - spin_lock_irq(&ctx->timeout_lock); - list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { - u32 events_needed, events_got; - - if (io_is_timeout_noseq(req)) - break; - - /* - * Since seq can easily wrap around over time, subtract - * the last seq at which timeouts were flushed before comparing. - * Assuming not more than 2^31-1 events have happened since, - * these subtractions won't have wrapped, so we can check if - * target is in [last_seq, current_seq] by comparing the two. - */ - events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; - events_got = seq - ctx->cq_last_tm_flush; - if (events_got < events_needed) - break; - - io_kill_timeout(req, 0); - } - ctx->cq_last_tm_flush = seq; - spin_unlock_irq(&ctx->timeout_lock); -} - -static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) -{ - if (ctx->off_timeout_used) - io_flush_timeouts(ctx); - if (ctx->drain_active) - io_queue_deferred(ctx); -} - -static inline void io_commit_cqring(struct io_ring_ctx *ctx) -{ - if (unlikely(ctx->off_timeout_used || ctx->drain_active)) - __io_commit_cqring_flush(ctx); - /* order cqe stores with ring update */ - smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); -} - -static inline bool io_sqring_full(struct io_ring_ctx *ctx) -{ - struct io_rings *r = ctx->rings; - - return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; -} - -static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) -{ - return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); -} - -static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) -{ - struct io_rings *rings = ctx->rings; - unsigned tail, mask = ctx->cq_entries - 1; - - /* - * writes to the cq entry need to come after reading head; the - * control dependency is enough as we're using WRITE_ONCE to - * fill the cq entry - */ - if (__io_cqring_events(ctx) == ctx->cq_entries) - return NULL; - - tail = ctx->cached_cq_tail++; - return &rings->cqes[tail & mask]; -} - -static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) -{ - if (likely(!ctx->cq_ev_fd)) - return false; - if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) - return false; - return !ctx->eventfd_async || io_wq_current_is_worker(); -} - -/* - * This should only get called when at least one event has been posted. - * Some applications rely on the eventfd notification count only changing - * IFF a new CQE has been added to the CQ ring. There's no depedency on - * 1:1 relationship between how many times this function is called (and - * hence the eventfd count) and number of CQEs posted to the CQ ring. - */ -static void io_cqring_ev_posted(struct io_ring_ctx *ctx) -{ - /* - * wake_up_all() may seem excessive, but io_wake_function() and - * io_should_wake() handle the termination of the loop and only - * wake as many waiters as we need to. - */ - if (wq_has_sleeper(&ctx->cq_wait)) - wake_up_all(&ctx->cq_wait); - if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) - wake_up(&ctx->sq_data->wait); - if (io_should_trigger_evfd(ctx)) - eventfd_signal(ctx->cq_ev_fd, 1); - if (waitqueue_active(&ctx->poll_wait)) - wake_up_interruptible(&ctx->poll_wait); -} - -static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) -{ - /* see waitqueue_active() comment */ - smp_mb(); - - if (ctx->flags & IORING_SETUP_SQPOLL) { - if (waitqueue_active(&ctx->cq_wait)) - wake_up_all(&ctx->cq_wait); - } - if (io_should_trigger_evfd(ctx)) - eventfd_signal(ctx->cq_ev_fd, 1); - if (waitqueue_active(&ctx->poll_wait)) - wake_up_interruptible(&ctx->poll_wait); -} - -/* Returns true if there are no backlogged entries after the flush */ -static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) -{ - bool all_flushed, posted; - - if (!force && __io_cqring_events(ctx) == ctx->cq_entries) - return false; - - posted = false; - spin_lock(&ctx->completion_lock); - while (!list_empty(&ctx->cq_overflow_list)) { - struct io_uring_cqe *cqe = io_get_cqe(ctx); - struct io_overflow_cqe *ocqe; - - if (!cqe && !force) - break; - ocqe = list_first_entry(&ctx->cq_overflow_list, - struct io_overflow_cqe, list); - if (cqe) - memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); - else - io_account_cq_overflow(ctx); - - posted = true; - list_del(&ocqe->list); - kfree(ocqe); - } - - all_flushed = list_empty(&ctx->cq_overflow_list); - if (all_flushed) { - clear_bit(0, &ctx->check_cq_overflow); - WRITE_ONCE(ctx->rings->sq_flags, - ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); - } - - if (posted) - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - if (posted) - io_cqring_ev_posted(ctx); - return all_flushed; -} - -static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) -{ - bool ret = true; - - if (test_bit(0, &ctx->check_cq_overflow)) { - /* iopoll syncs against uring_lock, not completion_lock */ - if (ctx->flags & IORING_SETUP_IOPOLL) - mutex_lock(&ctx->uring_lock); - ret = __io_cqring_overflow_flush(ctx, false); - if (ctx->flags & IORING_SETUP_IOPOLL) - mutex_unlock(&ctx->uring_lock); - } - - return ret; -} - -/* must to be called somewhat shortly after putting a request */ -static inline void io_put_task(struct task_struct *task, int nr) -{ - struct io_uring_task *tctx = task->io_uring; - - if (likely(task == current)) { - tctx->cached_refs += nr; - } else { - percpu_counter_sub(&tctx->inflight, nr); - if (unlikely(atomic_read(&tctx->in_idle))) - wake_up(&tctx->wait); - put_task_struct_many(task, nr); - } -} - -static void io_task_refs_refill(struct io_uring_task *tctx) -{ - unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; - - percpu_counter_add(&tctx->inflight, refill); - refcount_add(refill, ¤t->usage); - tctx->cached_refs += refill; -} - -static inline void io_get_task_refs(int nr) -{ - struct io_uring_task *tctx = current->io_uring; - - tctx->cached_refs -= nr; - if (unlikely(tctx->cached_refs < 0)) - io_task_refs_refill(tctx); -} - -static __cold void io_uring_drop_tctx_refs(struct task_struct *task) -{ - struct io_uring_task *tctx = task->io_uring; - unsigned int refs = tctx->cached_refs; - - if (refs) { - tctx->cached_refs = 0; - percpu_counter_sub(&tctx->inflight, refs); - put_task_struct_many(task, refs); - } -} - -static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, - s32 res, u32 cflags) -{ - struct io_overflow_cqe *ocqe; - - ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); - if (!ocqe) { - /* - * If we're in ring overflow flush mode, or in task cancel mode, - * or cannot allocate an overflow entry, then we need to drop it - * on the floor. - */ - io_account_cq_overflow(ctx); - return false; - } - if (list_empty(&ctx->cq_overflow_list)) { - set_bit(0, &ctx->check_cq_overflow); - WRITE_ONCE(ctx->rings->sq_flags, - ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); - - } - ocqe->cqe.user_data = user_data; - ocqe->cqe.res = res; - ocqe->cqe.flags = cflags; - list_add_tail(&ocqe->list, &ctx->cq_overflow_list); - return true; -} - -static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, - s32 res, u32 cflags) -{ - struct io_uring_cqe *cqe; - - trace_io_uring_complete(ctx, user_data, res, cflags); - - /* - * If we can't get a cq entry, userspace overflowed the - * submission (by quite a lot). Increment the overflow count in - * the ring. - */ - cqe = io_get_cqe(ctx); - if (likely(cqe)) { - WRITE_ONCE(cqe->user_data, user_data); - WRITE_ONCE(cqe->res, res); - WRITE_ONCE(cqe->flags, cflags); - return true; - } - return io_cqring_event_overflow(ctx, user_data, res, cflags); -} - -static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) -{ - __io_fill_cqe(req->ctx, req->user_data, res, cflags); -} - -static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, - s32 res, u32 cflags) -{ - ctx->cq_extra++; - return __io_fill_cqe(ctx, user_data, res, cflags); -} - -static void io_req_complete_post(struct io_kiocb *req, s32 res, - u32 cflags) -{ - struct io_ring_ctx *ctx = req->ctx; - - spin_lock(&ctx->completion_lock); - __io_fill_cqe(ctx, req->user_data, res, cflags); - /* - * If we're the last reference to this request, add to our locked - * free_list cache. - */ - if (req_ref_put_and_test(req)) { - if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { - if (req->flags & IO_DISARM_MASK) - io_disarm_next(req); - if (req->link) { - io_req_task_queue(req->link); - req->link = NULL; - } - } - io_dismantle_req(req); - io_put_task(req->task, 1); - list_add(&req->inflight_entry, &ctx->locked_free_list); - ctx->locked_free_nr++; - } else { - if (!percpu_ref_tryget(&ctx->refs)) - req = NULL; - } - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - - if (req) { - io_cqring_ev_posted(ctx); - percpu_ref_put(&ctx->refs); - } -} - -static inline bool io_req_needs_clean(struct io_kiocb *req) -{ - return req->flags & IO_REQ_CLEAN_FLAGS; -} - -static inline void io_req_complete_state(struct io_kiocb *req, s32 res, - u32 cflags) -{ - if (io_req_needs_clean(req)) - io_clean_op(req); - req->result = res; - req->compl.cflags = cflags; - req->flags |= REQ_F_COMPLETE_INLINE; -} - -static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, - s32 res, u32 cflags) -{ - if (issue_flags & IO_URING_F_COMPLETE_DEFER) - io_req_complete_state(req, res, cflags); - else - io_req_complete_post(req, res, cflags); -} - -static inline void io_req_complete(struct io_kiocb *req, s32 res) -{ - __io_req_complete(req, 0, res, 0); -} - -static void io_req_complete_failed(struct io_kiocb *req, s32 res) -{ - req_set_fail(req); - io_req_complete_post(req, res, 0); -} - -static void io_req_complete_fail_submit(struct io_kiocb *req) -{ - /* - * We don't submit, fail them all, for that replace hardlinks with - * normal links. Extra REQ_F_LINK is tolerated. - */ - req->flags &= ~REQ_F_HARDLINK; - req->flags |= REQ_F_LINK; - io_req_complete_failed(req, req->result); -} - -/* - * Don't initialise the fields below on every allocation, but do that in - * advance and keep them valid across allocations. - */ -static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) -{ - req->ctx = ctx; - req->link = NULL; - req->async_data = NULL; - /* not necessary, but safer to zero */ - req->result = 0; -} - -static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, - struct io_submit_state *state) -{ - spin_lock(&ctx->completion_lock); - list_splice_init(&ctx->locked_free_list, &state->free_list); - ctx->locked_free_nr = 0; - spin_unlock(&ctx->completion_lock); -} - -/* Returns true IFF there are requests in the cache */ -static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) -{ - struct io_submit_state *state = &ctx->submit_state; - int nr; - - /* - * If we have more than a batch's worth of requests in our IRQ side - * locked cache, grab the lock and move them over to our submission - * side cache. - */ - if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) - io_flush_cached_locked_reqs(ctx, state); - - nr = state->free_reqs; - while (!list_empty(&state->free_list)) { - struct io_kiocb *req = list_first_entry(&state->free_list, - struct io_kiocb, inflight_entry); - - list_del(&req->inflight_entry); - state->reqs[nr++] = req; - if (nr == ARRAY_SIZE(state->reqs)) - break; - } - - state->free_reqs = nr; - return nr != 0; -} - -/* - * A request might get retired back into the request caches even before opcode - * handlers and io_issue_sqe() are done with it, e.g. inline completion path. - * Because of that, io_alloc_req() should be called only under ->uring_lock - * and with extra caution to not get a request that is still worked on. - */ -static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) - __must_hold(&ctx->uring_lock) -{ - struct io_submit_state *state = &ctx->submit_state; - gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; - int ret, i; - - BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); - - if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) - goto got_req; - - ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, - state->reqs); - - /* - * Bulk alloc is all-or-nothing. If we fail to get a batch, - * retry single alloc to be on the safe side. - */ - if (unlikely(ret <= 0)) { - state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); - if (!state->reqs[0]) - return NULL; - ret = 1; - } - - for (i = 0; i < ret; i++) - io_preinit_req(state->reqs[i], ctx); - state->free_reqs = ret; -got_req: - state->free_reqs--; - return state->reqs[state->free_reqs]; -} - -static inline void io_put_file(struct file *file) -{ - if (file) - fput(file); -} - -static void io_dismantle_req(struct io_kiocb *req) -{ - unsigned int flags = req->flags; - - if (io_req_needs_clean(req)) - io_clean_op(req); - if (!(flags & REQ_F_FIXED_FILE)) - io_put_file(req->file); - if (req->fixed_rsrc_refs) - percpu_ref_put(req->fixed_rsrc_refs); - if (req->async_data) { - kfree(req->async_data); - req->async_data = NULL; - } -} - -static void __io_free_req(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - - io_dismantle_req(req); - io_put_task(req->task, 1); - - spin_lock(&ctx->completion_lock); - list_add(&req->inflight_entry, &ctx->locked_free_list); - ctx->locked_free_nr++; - spin_unlock(&ctx->completion_lock); - - percpu_ref_put(&ctx->refs); -} - -static inline void io_remove_next_linked(struct io_kiocb *req) -{ - struct io_kiocb *nxt = req->link; - - req->link = nxt->link; - nxt->link = NULL; -} - -static bool io_kill_linked_timeout(struct io_kiocb *req) - __must_hold(&req->ctx->completion_lock) - __must_hold(&req->ctx->timeout_lock) -{ - struct io_kiocb *link = req->link; - - if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { - struct io_timeout_data *io = link->async_data; - - io_remove_next_linked(req); - link->timeout.head = NULL; - if (hrtimer_try_to_cancel(&io->timer) != -1) { - list_del(&link->timeout.list); - io_fill_cqe_req(link, -ECANCELED, 0); - io_put_req_deferred(link); - return true; - } - } - return false; -} - -static void io_fail_links(struct io_kiocb *req) - __must_hold(&req->ctx->completion_lock) -{ - struct io_kiocb *nxt, *link = req->link; - - req->link = NULL; - while (link) { - long res = -ECANCELED; - - if (link->flags & REQ_F_FAIL) - res = link->result; - - nxt = link->link; - link->link = NULL; - - trace_io_uring_fail_link(req, link); - io_fill_cqe_req(link, res, 0); - io_put_req_deferred(link); - link = nxt; - } -} - -static bool io_disarm_next(struct io_kiocb *req) - __must_hold(&req->ctx->completion_lock) -{ - bool posted = false; - - if (req->flags & REQ_F_ARM_LTIMEOUT) { - struct io_kiocb *link = req->link; - - req->flags &= ~REQ_F_ARM_LTIMEOUT; - if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { - io_remove_next_linked(req); - io_fill_cqe_req(link, -ECANCELED, 0); - io_put_req_deferred(link); - posted = true; - } - } else if (req->flags & REQ_F_LINK_TIMEOUT) { - struct io_ring_ctx *ctx = req->ctx; - - spin_lock_irq(&ctx->timeout_lock); - posted = io_kill_linked_timeout(req); - spin_unlock_irq(&ctx->timeout_lock); - } - if (unlikely((req->flags & REQ_F_FAIL) && - !(req->flags & REQ_F_HARDLINK))) { - posted |= (req->link != NULL); - io_fail_links(req); - } - return posted; -} - -static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) -{ - struct io_kiocb *nxt; - - /* - * If LINK is set, we have dependent requests in this chain. If we - * didn't fail this request, queue the first one up, moving any other - * dependencies to the next request. In case of failure, fail the rest - * of the chain. - */ - if (req->flags & IO_DISARM_MASK) { - struct io_ring_ctx *ctx = req->ctx; - bool posted; - - spin_lock(&ctx->completion_lock); - posted = io_disarm_next(req); - if (posted) - io_commit_cqring(req->ctx); - spin_unlock(&ctx->completion_lock); - if (posted) - io_cqring_ev_posted(ctx); - } - nxt = req->link; - req->link = NULL; - return nxt; -} - -static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) -{ - if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) - return NULL; - return __io_req_find_next(req); -} - -static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) -{ - if (!ctx) - return; - if (*locked) { - if (ctx->submit_state.compl_nr) - io_submit_flush_completions(ctx); - mutex_unlock(&ctx->uring_lock); - *locked = false; - } - percpu_ref_put(&ctx->refs); -} - -static void tctx_task_work(struct callback_head *cb) -{ - bool locked = false; - struct io_ring_ctx *ctx = NULL; - struct io_uring_task *tctx = container_of(cb, struct io_uring_task, - task_work); - - while (1) { - struct io_wq_work_node *node; - - if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr) - io_submit_flush_completions(ctx); - - spin_lock_irq(&tctx->task_lock); - node = tctx->task_list.first; - INIT_WQ_LIST(&tctx->task_list); - if (!node) - tctx->task_running = false; - spin_unlock_irq(&tctx->task_lock); - if (!node) - break; - - do { - struct io_wq_work_node *next = node->next; - struct io_kiocb *req = container_of(node, struct io_kiocb, - io_task_work.node); - - if (req->ctx != ctx) { - ctx_flush_and_put(ctx, &locked); - ctx = req->ctx; - /* if not contended, grab and improve batching */ - locked = mutex_trylock(&ctx->uring_lock); - percpu_ref_get(&ctx->refs); - } - req->io_task_work.func(req, &locked); - node = next; - } while (node); - - cond_resched(); - } - - ctx_flush_and_put(ctx, &locked); - - /* relaxed read is enough as only the task itself sets ->in_idle */ - if (unlikely(atomic_read(&tctx->in_idle))) - io_uring_drop_tctx_refs(current); -} - -static void io_req_task_work_add(struct io_kiocb *req) -{ - struct task_struct *tsk = req->task; - struct io_uring_task *tctx = tsk->io_uring; - enum task_work_notify_mode notify; - struct io_wq_work_node *node; - unsigned long flags; - bool running; - - WARN_ON_ONCE(!tctx); - - spin_lock_irqsave(&tctx->task_lock, flags); - wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); - running = tctx->task_running; - if (!running) - tctx->task_running = true; - spin_unlock_irqrestore(&tctx->task_lock, flags); - - /* task_work already pending, we're done */ - if (running) - return; - - /* - * SQPOLL kernel thread doesn't need notification, just a wakeup. For - * all other cases, use TWA_SIGNAL unconditionally to ensure we're - * processing task_work. There's no reliable way to tell if TWA_RESUME - * will do the job. - */ - notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; - if (!task_work_add(tsk, &tctx->task_work, notify)) { - wake_up_process(tsk); - return; - } - - spin_lock_irqsave(&tctx->task_lock, flags); - tctx->task_running = false; - node = tctx->task_list.first; - INIT_WQ_LIST(&tctx->task_list); - spin_unlock_irqrestore(&tctx->task_lock, flags); - - while (node) { - req = container_of(node, struct io_kiocb, io_task_work.node); - node = node->next; - if (llist_add(&req->io_task_work.fallback_node, - &req->ctx->fallback_llist)) - schedule_delayed_work(&req->ctx->fallback_work, 1); - } -} - -static void io_req_task_cancel(struct io_kiocb *req, bool *locked) -{ - struct io_ring_ctx *ctx = req->ctx; - - /* not needed for normal modes, but SQPOLL depends on it */ - io_tw_lock(ctx, locked); - io_req_complete_failed(req, req->result); -} - -static void io_req_task_submit(struct io_kiocb *req, bool *locked) -{ - struct io_ring_ctx *ctx = req->ctx; - - io_tw_lock(ctx, locked); - /* req->task == current here, checking PF_EXITING is safe */ - if (likely(!(req->task->flags & PF_EXITING))) - __io_queue_sqe(req); - else - io_req_complete_failed(req, -EFAULT); -} - -static void io_req_task_queue_fail(struct io_kiocb *req, int ret) -{ - req->result = ret; - req->io_task_work.func = io_req_task_cancel; - io_req_task_work_add(req); -} - -static void io_req_task_queue(struct io_kiocb *req) -{ - req->io_task_work.func = io_req_task_submit; - io_req_task_work_add(req); -} - -static void io_req_task_queue_reissue(struct io_kiocb *req) -{ - req->io_task_work.func = io_queue_async_work; - io_req_task_work_add(req); -} - -static inline void io_queue_next(struct io_kiocb *req) -{ - struct io_kiocb *nxt = io_req_find_next(req); - - if (nxt) - io_req_task_queue(nxt); -} - -static void io_free_req(struct io_kiocb *req) -{ - io_queue_next(req); - __io_free_req(req); -} - -static void io_free_req_work(struct io_kiocb *req, bool *locked) -{ - io_free_req(req); -} - -struct req_batch { - struct task_struct *task; - int task_refs; - int ctx_refs; -}; - -static inline void io_init_req_batch(struct req_batch *rb) -{ - rb->task_refs = 0; - rb->ctx_refs = 0; - rb->task = NULL; -} - -static void io_req_free_batch_finish(struct io_ring_ctx *ctx, - struct req_batch *rb) -{ - if (rb->ctx_refs) - percpu_ref_put_many(&ctx->refs, rb->ctx_refs); - if (rb->task) - io_put_task(rb->task, rb->task_refs); -} - -static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, - struct io_submit_state *state) -{ - io_queue_next(req); - io_dismantle_req(req); - - if (req->task != rb->task) { - if (rb->task) - io_put_task(rb->task, rb->task_refs); - rb->task = req->task; - rb->task_refs = 0; - } - rb->task_refs++; - rb->ctx_refs++; - - if (state->free_reqs != ARRAY_SIZE(state->reqs)) - state->reqs[state->free_reqs++] = req; - else - list_add(&req->inflight_entry, &state->free_list); -} - -static void io_submit_flush_completions(struct io_ring_ctx *ctx) - __must_hold(&ctx->uring_lock) -{ - struct io_submit_state *state = &ctx->submit_state; - int i, nr = state->compl_nr; - struct req_batch rb; - - spin_lock(&ctx->completion_lock); - for (i = 0; i < nr; i++) { - struct io_kiocb *req = state->compl_reqs[i]; - - __io_fill_cqe(ctx, req->user_data, req->result, - req->compl.cflags); - } - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - io_cqring_ev_posted(ctx); - - io_init_req_batch(&rb); - for (i = 0; i < nr; i++) { - struct io_kiocb *req = state->compl_reqs[i]; - - if (req_ref_put_and_test(req)) - io_req_free_batch(&rb, req, &ctx->submit_state); - } - - io_req_free_batch_finish(ctx, &rb); - state->compl_nr = 0; -} - -/* - * Drop reference to request, return next in chain (if there is one) if this - * was the last reference to this request. - */ -static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) -{ - struct io_kiocb *nxt = NULL; - - if (req_ref_put_and_test(req)) { - nxt = io_req_find_next(req); - __io_free_req(req); - } - return nxt; -} - -static inline void io_put_req(struct io_kiocb *req) -{ - if (req_ref_put_and_test(req)) - io_free_req(req); -} - -static inline void io_put_req_deferred(struct io_kiocb *req) -{ - if (req_ref_put_and_test(req)) { - req->io_task_work.func = io_free_req_work; - io_req_task_work_add(req); - } -} - -static unsigned io_cqring_events(struct io_ring_ctx *ctx) -{ - /* See comment at the top of this file */ - smp_rmb(); - return __io_cqring_events(ctx); -} - -static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) -{ - struct io_rings *rings = ctx->rings; - - /* make sure SQ entry isn't read before tail */ - return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; -} - -static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) -{ - unsigned int cflags; - - cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; - cflags |= IORING_CQE_F_BUFFER; - req->flags &= ~REQ_F_BUFFER_SELECTED; - kfree(kbuf); - return cflags; -} - -static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) -{ - struct io_buffer *kbuf; - - if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) - return 0; - kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; - return io_put_kbuf(req, kbuf); -} - -static inline bool io_run_task_work(void) -{ - if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { - __set_current_state(TASK_RUNNING); - tracehook_notify_signal(); - return true; - } - - return false; -} - -/* - * Find and free completed poll iocbs - */ -static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, - struct list_head *done) -{ - struct req_batch rb; - struct io_kiocb *req; - - /* order with ->result store in io_complete_rw_iopoll() */ - smp_rmb(); - - io_init_req_batch(&rb); - while (!list_empty(done)) { - req = list_first_entry(done, struct io_kiocb, inflight_entry); - list_del(&req->inflight_entry); - - io_fill_cqe_req(req, req->result, io_put_rw_kbuf(req)); - (*nr_events)++; - - if (req_ref_put_and_test(req)) - io_req_free_batch(&rb, req, &ctx->submit_state); - } - - io_commit_cqring(ctx); - io_cqring_ev_posted_iopoll(ctx); - io_req_free_batch_finish(ctx, &rb); -} - -static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, - long min) -{ - struct io_kiocb *req, *tmp; - LIST_HEAD(done); - bool spin; - - /* - * Only spin for completions if we don't have multiple devices hanging - * off our complete list, and we're under the requested amount. - */ - spin = !ctx->poll_multi_queue && *nr_events < min; - - list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { - struct kiocb *kiocb = &req->rw.kiocb; - int ret; - - /* - * Move completed and retryable entries to our local lists. - * If we find a request that requires polling, break out - * and complete those lists first, if we have entries there. - */ - if (READ_ONCE(req->iopoll_completed)) { - list_move_tail(&req->inflight_entry, &done); - continue; - } - if (!list_empty(&done)) - break; - - ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); - if (unlikely(ret < 0)) - return ret; - else if (ret) - spin = false; - - /* iopoll may have completed current req */ - if (READ_ONCE(req->iopoll_completed)) - list_move_tail(&req->inflight_entry, &done); - } - - if (!list_empty(&done)) - io_iopoll_complete(ctx, nr_events, &done); - - return 0; -} - -/* - * We can't just wait for polled events to come to us, we have to actively - * find and complete them. - */ -static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) -{ - if (!(ctx->flags & IORING_SETUP_IOPOLL)) - return; - - mutex_lock(&ctx->uring_lock); - while (!list_empty(&ctx->iopoll_list)) { - unsigned int nr_events = 0; - - io_do_iopoll(ctx, &nr_events, 0); - - /* let it sleep and repeat later if can't complete a request */ - if (nr_events == 0) - break; - /* - * Ensure we allow local-to-the-cpu processing to take place, - * in this case we need to ensure that we reap all events. - * Also let task_work, etc. to progress by releasing the mutex - */ - if (need_resched()) { - mutex_unlock(&ctx->uring_lock); - cond_resched(); - mutex_lock(&ctx->uring_lock); - } - } - mutex_unlock(&ctx->uring_lock); -} - -static int io_iopoll_check(struct io_ring_ctx *ctx, long min) -{ - unsigned int nr_events = 0; - int ret = 0; - - /* - * We disallow the app entering submit/complete with polling, but we - * still need to lock the ring to prevent racing with polled issue - * that got punted to a workqueue. - */ - mutex_lock(&ctx->uring_lock); - /* - * Don't enter poll loop if we already have events pending. - * If we do, we can potentially be spinning for commands that - * already triggered a CQE (eg in error). - */ - if (test_bit(0, &ctx->check_cq_overflow)) - __io_cqring_overflow_flush(ctx, false); - if (io_cqring_events(ctx)) - goto out; - do { - /* - * If a submit got punted to a workqueue, we can have the - * application entering polling for a command before it gets - * issued. That app will hold the uring_lock for the duration - * of the poll right here, so we need to take a breather every - * now and then to ensure that the issue has a chance to add - * the poll to the issued list. Otherwise we can spin here - * forever, while the workqueue is stuck trying to acquire the - * very same mutex. - */ - if (list_empty(&ctx->iopoll_list)) { - u32 tail = ctx->cached_cq_tail; - - mutex_unlock(&ctx->uring_lock); - io_run_task_work(); - mutex_lock(&ctx->uring_lock); - - /* some requests don't go through iopoll_list */ - if (tail != ctx->cached_cq_tail || - list_empty(&ctx->iopoll_list)) - break; - } - ret = io_do_iopoll(ctx, &nr_events, min); - } while (!ret && nr_events < min && !need_resched()); -out: - mutex_unlock(&ctx->uring_lock); - return ret; -} - -static void kiocb_end_write(struct io_kiocb *req) -{ - /* - * Tell lockdep we inherited freeze protection from submission - * thread. - */ - if (req->flags & REQ_F_ISREG) { - struct super_block *sb = file_inode(req->file)->i_sb; - - __sb_writers_acquired(sb, SB_FREEZE_WRITE); - sb_end_write(sb); - } -} - -#ifdef CONFIG_BLOCK -static bool io_resubmit_prep(struct io_kiocb *req) -{ - struct io_async_rw *rw = req->async_data; - - if (!rw) - return !io_req_prep_async(req); - iov_iter_restore(&rw->iter, &rw->iter_state); - return true; -} - -static bool io_rw_should_reissue(struct io_kiocb *req) -{ - umode_t mode = file_inode(req->file)->i_mode; - struct io_ring_ctx *ctx = req->ctx; - - if (!S_ISBLK(mode) && !S_ISREG(mode)) - return false; - if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && - !(ctx->flags & IORING_SETUP_IOPOLL))) - return false; - /* - * If ref is dying, we might be running poll reap from the exit work. - * Don't attempt to reissue from that path, just let it fail with - * -EAGAIN. - */ - if (percpu_ref_is_dying(&ctx->refs)) - return false; - /* - * Play it safe and assume not safe to re-import and reissue if we're - * not in the original thread group (or in task context). - */ - if (!same_thread_group(req->task, current) || !in_task()) - return false; - return true; -} -#else -static bool io_resubmit_prep(struct io_kiocb *req) -{ - return false; -} -static bool io_rw_should_reissue(struct io_kiocb *req) -{ - return false; -} -#endif - -static bool __io_complete_rw_common(struct io_kiocb *req, long res) -{ - if (req->rw.kiocb.ki_flags & IOCB_WRITE) { - kiocb_end_write(req); - fsnotify_modify(req->file); - } else { - fsnotify_access(req->file); - } - if (res != req->result) { - if ((res == -EAGAIN || res == -EOPNOTSUPP) && - io_rw_should_reissue(req)) { - req->flags |= REQ_F_REISSUE; - return true; - } - req_set_fail(req); - req->result = res; - } - return false; -} - -static inline int io_fixup_rw_res(struct io_kiocb *req, unsigned res) -{ - struct io_async_rw *io = req->async_data; - - /* add previously done IO, if any */ - if (io && io->bytes_done > 0) { - if (res < 0) - res = io->bytes_done; - else - res += io->bytes_done; - } - return res; -} - -static void io_req_task_complete(struct io_kiocb *req, bool *locked) -{ - unsigned int cflags = io_put_rw_kbuf(req); - int res = req->result; - - if (*locked) { - struct io_ring_ctx *ctx = req->ctx; - struct io_submit_state *state = &ctx->submit_state; - - io_req_complete_state(req, res, cflags); - state->compl_reqs[state->compl_nr++] = req; - if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) - io_submit_flush_completions(ctx); - } else { - io_req_complete_post(req, res, cflags); - } -} - -static void __io_complete_rw(struct io_kiocb *req, long res, long res2, - unsigned int issue_flags) -{ - if (__io_complete_rw_common(req, res)) - return; - __io_req_complete(req, issue_flags, io_fixup_rw_res(req, res), io_put_rw_kbuf(req)); -} - -static void io_complete_rw(struct kiocb *kiocb, long res, long res2) -{ - struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); - - if (__io_complete_rw_common(req, res)) - return; - req->result = io_fixup_rw_res(req, res); - req->io_task_work.func = io_req_task_complete; - io_req_task_work_add(req); -} - -static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) -{ - struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); - - if (kiocb->ki_flags & IOCB_WRITE) - kiocb_end_write(req); - if (unlikely(res != req->result)) { - if (res == -EAGAIN && io_rw_should_reissue(req)) { - req->flags |= REQ_F_REISSUE; - return; - } - } - - WRITE_ONCE(req->result, res); - /* order with io_iopoll_complete() checking ->result */ - smp_wmb(); - WRITE_ONCE(req->iopoll_completed, 1); -} - -/* - * After the iocb has been issued, it's safe to be found on the poll list. - * Adding the kiocb to the list AFTER submission ensures that we don't - * find it from a io_do_iopoll() thread before the issuer is done - * accessing the kiocb cookie. - */ -static void io_iopoll_req_issued(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - const bool in_async = io_wq_current_is_worker(); - - /* workqueue context doesn't hold uring_lock, grab it now */ - if (unlikely(in_async)) - mutex_lock(&ctx->uring_lock); - - /* - * Track whether we have multiple files in our lists. This will impact - * how we do polling eventually, not spinning if we're on potentially - * different devices. - */ - if (list_empty(&ctx->iopoll_list)) { - ctx->poll_multi_queue = false; - } else if (!ctx->poll_multi_queue) { - struct io_kiocb *list_req; - unsigned int queue_num0, queue_num1; - - list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, - inflight_entry); - - if (list_req->file != req->file) { - ctx->poll_multi_queue = true; - } else { - queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); - queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); - if (queue_num0 != queue_num1) - ctx->poll_multi_queue = true; - } - } - - /* - * For fast devices, IO may have already completed. If it has, add - * it to the front so we find it first. - */ - if (READ_ONCE(req->iopoll_completed)) - list_add(&req->inflight_entry, &ctx->iopoll_list); - else - list_add_tail(&req->inflight_entry, &ctx->iopoll_list); - - if (unlikely(in_async)) { - /* - * If IORING_SETUP_SQPOLL is enabled, sqes are either handle - * in sq thread task context or in io worker task context. If - * current task context is sq thread, we don't need to check - * whether should wake up sq thread. - */ - if ((ctx->flags & IORING_SETUP_SQPOLL) && - wq_has_sleeper(&ctx->sq_data->wait)) - wake_up(&ctx->sq_data->wait); - - mutex_unlock(&ctx->uring_lock); - } -} - -static bool io_bdev_nowait(struct block_device *bdev) -{ - return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); -} - -/* - * If we tracked the file through the SCM inflight mechanism, we could support - * any file. For now, just ensure that anything potentially problematic is done - * inline. - */ -static bool __io_file_supports_nowait(struct file *file, int rw) -{ - umode_t mode = file_inode(file)->i_mode; - - if (S_ISBLK(mode)) { - if (IS_ENABLED(CONFIG_BLOCK) && - io_bdev_nowait(I_BDEV(file->f_mapping->host))) - return true; - return false; - } - if (S_ISSOCK(mode)) - return true; - if (S_ISREG(mode)) { - if (IS_ENABLED(CONFIG_BLOCK) && - io_bdev_nowait(file->f_inode->i_sb->s_bdev) && - file->f_op != &io_uring_fops) - return true; - return false; - } - - /* any ->read/write should understand O_NONBLOCK */ - if (file->f_flags & O_NONBLOCK) - return true; - - if (!(file->f_mode & FMODE_NOWAIT)) - return false; - - if (rw == READ) - return file->f_op->read_iter != NULL; - - return file->f_op->write_iter != NULL; -} - -static bool io_file_supports_nowait(struct io_kiocb *req, int rw) -{ - if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) - return true; - else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) - return true; - - return __io_file_supports_nowait(req->file, rw); -} - -static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, - int rw) -{ - struct io_ring_ctx *ctx = req->ctx; - struct kiocb *kiocb = &req->rw.kiocb; - struct file *file = req->file; - unsigned ioprio; - int ret; - - if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) - req->flags |= REQ_F_ISREG; - - kiocb->ki_pos = READ_ONCE(sqe->off); - if (kiocb->ki_pos == -1) { - if (!(file->f_mode & FMODE_STREAM)) { - req->flags |= REQ_F_CUR_POS; - kiocb->ki_pos = file->f_pos; - } else { - kiocb->ki_pos = 0; - } - } - kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); - kiocb->ki_flags = iocb_flags(kiocb->ki_filp); - ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); - if (unlikely(ret)) - return ret; - - /* - * If the file is marked O_NONBLOCK, still allow retry for it if it - * supports async. Otherwise it's impossible to use O_NONBLOCK files - * reliably. If not, or it IOCB_NOWAIT is set, don't retry. - */ - if ((kiocb->ki_flags & IOCB_NOWAIT) || - ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req, rw))) - req->flags |= REQ_F_NOWAIT; - - ioprio = READ_ONCE(sqe->ioprio); - if (ioprio) { - ret = ioprio_check_cap(ioprio); - if (ret) - return ret; - - kiocb->ki_ioprio = ioprio; - } else - kiocb->ki_ioprio = get_current_ioprio(); - - if (ctx->flags & IORING_SETUP_IOPOLL) { - if (!(kiocb->ki_flags & IOCB_DIRECT) || - !kiocb->ki_filp->f_op->iopoll) - return -EOPNOTSUPP; - - kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; - kiocb->ki_complete = io_complete_rw_iopoll; - req->iopoll_completed = 0; - } else { - if (kiocb->ki_flags & IOCB_HIPRI) - return -EINVAL; - kiocb->ki_complete = io_complete_rw; - } - - /* used for fixed read/write too - just read unconditionally */ - req->buf_index = READ_ONCE(sqe->buf_index); - req->imu = NULL; - - if (req->opcode == IORING_OP_READ_FIXED || - req->opcode == IORING_OP_WRITE_FIXED) { - struct io_ring_ctx *ctx = req->ctx; - u16 index; - - if (unlikely(req->buf_index >= ctx->nr_user_bufs)) - return -EFAULT; - index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); - req->imu = ctx->user_bufs[index]; - io_req_set_rsrc_node(req); - } - - req->rw.addr = READ_ONCE(sqe->addr); - req->rw.len = READ_ONCE(sqe->len); - return 0; -} - -static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) -{ - switch (ret) { - case -EIOCBQUEUED: - break; - case -ERESTARTSYS: - case -ERESTARTNOINTR: - case -ERESTARTNOHAND: - case -ERESTART_RESTARTBLOCK: - /* - * We can't just restart the syscall, since previously - * submitted sqes may already be in progress. Just fail this - * IO with EINTR. - */ - ret = -EINTR; - fallthrough; - default: - kiocb->ki_complete(kiocb, ret, 0); - } -} - -static void kiocb_done(struct kiocb *kiocb, ssize_t ret, - unsigned int issue_flags) -{ - struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); - - if (req->flags & REQ_F_CUR_POS) - req->file->f_pos = kiocb->ki_pos; - if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) - __io_complete_rw(req, ret, 0, issue_flags); - else - io_rw_done(kiocb, ret); - - if (req->flags & REQ_F_REISSUE) { - req->flags &= ~REQ_F_REISSUE; - if (io_resubmit_prep(req)) { - io_req_task_queue_reissue(req); - } else { - unsigned int cflags = io_put_rw_kbuf(req); - struct io_ring_ctx *ctx = req->ctx; - - ret = io_fixup_rw_res(req, ret); - req_set_fail(req); - if (!(issue_flags & IO_URING_F_NONBLOCK)) { - mutex_lock(&ctx->uring_lock); - __io_req_complete(req, issue_flags, ret, cflags); - mutex_unlock(&ctx->uring_lock); - } else { - __io_req_complete(req, issue_flags, ret, cflags); - } - } - } -} - -static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, - struct io_mapped_ubuf *imu) -{ - size_t len = req->rw.len; - u64 buf_end, buf_addr = req->rw.addr; - size_t offset; - - if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) - return -EFAULT; - /* not inside the mapped region */ - if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) - return -EFAULT; - - /* - * May not be a start of buffer, set size appropriately - * and advance us to the beginning. - */ - offset = buf_addr - imu->ubuf; - iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); - - if (offset) { - /* - * Don't use iov_iter_advance() here, as it's really slow for - * using the latter parts of a big fixed buffer - it iterates - * over each segment manually. We can cheat a bit here, because - * we know that: - * - * 1) it's a BVEC iter, we set it up - * 2) all bvecs are PAGE_SIZE in size, except potentially the - * first and last bvec - * - * So just find our index, and adjust the iterator afterwards. - * If the offset is within the first bvec (or the whole first - * bvec, just use iov_iter_advance(). This makes it easier - * since we can just skip the first segment, which may not - * be PAGE_SIZE aligned. - */ - const struct bio_vec *bvec = imu->bvec; - - if (offset <= bvec->bv_len) { - iov_iter_advance(iter, offset); - } else { - unsigned long seg_skip; - - /* skip first vec */ - offset -= bvec->bv_len; - seg_skip = 1 + (offset >> PAGE_SHIFT); - - iter->bvec = bvec + seg_skip; - iter->nr_segs -= seg_skip; - iter->count -= bvec->bv_len + offset; - iter->iov_offset = offset & ~PAGE_MASK; - } - } - - return 0; -} - -static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) -{ - if (WARN_ON_ONCE(!req->imu)) - return -EFAULT; - return __io_import_fixed(req, rw, iter, req->imu); -} - -static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) -{ - if (needs_lock) - mutex_unlock(&ctx->uring_lock); -} - -static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) -{ - /* - * "Normal" inline submissions always hold the uring_lock, since we - * grab it from the system call. Same is true for the SQPOLL offload. - * The only exception is when we've detached the request and issue it - * from an async worker thread, grab the lock for that case. - */ - if (needs_lock) - mutex_lock(&ctx->uring_lock); -} - -static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, - int bgid, struct io_buffer *kbuf, - bool needs_lock) -{ - struct io_buffer *head; - - if (req->flags & REQ_F_BUFFER_SELECTED) - return kbuf; - - io_ring_submit_lock(req->ctx, needs_lock); - - lockdep_assert_held(&req->ctx->uring_lock); - - head = xa_load(&req->ctx->io_buffers, bgid); - if (head) { - if (!list_empty(&head->list)) { - kbuf = list_last_entry(&head->list, struct io_buffer, - list); - list_del(&kbuf->list); - } else { - kbuf = head; - xa_erase(&req->ctx->io_buffers, bgid); - } - if (*len > kbuf->len) - *len = kbuf->len; - } else { - kbuf = ERR_PTR(-ENOBUFS); - } - - io_ring_submit_unlock(req->ctx, needs_lock); - - return kbuf; -} - -static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, - bool needs_lock) -{ - struct io_buffer *kbuf; - u16 bgid; - - kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; - bgid = req->buf_index; - kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); - if (IS_ERR(kbuf)) - return kbuf; - req->rw.addr = (u64) (unsigned long) kbuf; - req->flags |= REQ_F_BUFFER_SELECTED; - return u64_to_user_ptr(kbuf->addr); -} - -#ifdef CONFIG_COMPAT -static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, - bool needs_lock) -{ - struct compat_iovec __user *uiov; - compat_ssize_t clen; - void __user *buf; - ssize_t len; - - uiov = u64_to_user_ptr(req->rw.addr); - if (!access_ok(uiov, sizeof(*uiov))) - return -EFAULT; - if (__get_user(clen, &uiov->iov_len)) - return -EFAULT; - if (clen < 0) - return -EINVAL; - - len = clen; - buf = io_rw_buffer_select(req, &len, needs_lock); - if (IS_ERR(buf)) - return PTR_ERR(buf); - iov[0].iov_base = buf; - iov[0].iov_len = (compat_size_t) len; - return 0; -} -#endif - -static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, - bool needs_lock) -{ - struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); - void __user *buf; - ssize_t len; - - if (copy_from_user(iov, uiov, sizeof(*uiov))) - return -EFAULT; - - len = iov[0].iov_len; - if (len < 0) - return -EINVAL; - buf = io_rw_buffer_select(req, &len, needs_lock); - if (IS_ERR(buf)) - return PTR_ERR(buf); - iov[0].iov_base = buf; - iov[0].iov_len = len; - return 0; -} - -static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, - bool needs_lock) -{ - if (req->flags & REQ_F_BUFFER_SELECTED) { - struct io_buffer *kbuf; - - kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; - iov[0].iov_base = u64_to_user_ptr(kbuf->addr); - iov[0].iov_len = kbuf->len; - return 0; - } - if (req->rw.len != 1) - return -EINVAL; - -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - return io_compat_import(req, iov, needs_lock); -#endif - - return __io_iov_buffer_select(req, iov, needs_lock); -} - -static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, - struct iov_iter *iter, bool needs_lock) -{ - void __user *buf = u64_to_user_ptr(req->rw.addr); - size_t sqe_len = req->rw.len; - u8 opcode = req->opcode; - ssize_t ret; - - if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { - *iovec = NULL; - return io_import_fixed(req, rw, iter); - } - - /* buffer index only valid with fixed read/write, or buffer select */ - if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) - return -EINVAL; - - if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { - if (req->flags & REQ_F_BUFFER_SELECT) { - buf = io_rw_buffer_select(req, &sqe_len, needs_lock); - if (IS_ERR(buf)) - return PTR_ERR(buf); - req->rw.len = sqe_len; - } - - ret = import_single_range(rw, buf, sqe_len, *iovec, iter); - *iovec = NULL; - return ret; - } - - if (req->flags & REQ_F_BUFFER_SELECT) { - ret = io_iov_buffer_select(req, *iovec, needs_lock); - if (!ret) - iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); - *iovec = NULL; - return ret; - } - - return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, - req->ctx->compat); -} - -static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) -{ - return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; -} - -/* - * For files that don't have ->read_iter() and ->write_iter(), handle them - * by looping over ->read() or ->write() manually. - */ -static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) -{ - struct kiocb *kiocb = &req->rw.kiocb; - struct file *file = req->file; - ssize_t ret = 0; - - /* - * Don't support polled IO through this interface, and we can't - * support non-blocking either. For the latter, this just causes - * the kiocb to be handled from an async context. - */ - if (kiocb->ki_flags & IOCB_HIPRI) - return -EOPNOTSUPP; - if (kiocb->ki_flags & IOCB_NOWAIT) - return -EAGAIN; - - while (iov_iter_count(iter)) { - struct iovec iovec; - ssize_t nr; - - if (!iov_iter_is_bvec(iter)) { - iovec = iov_iter_iovec(iter); - } else { - iovec.iov_base = u64_to_user_ptr(req->rw.addr); - iovec.iov_len = req->rw.len; - } - - if (rw == READ) { - nr = file->f_op->read(file, iovec.iov_base, - iovec.iov_len, io_kiocb_ppos(kiocb)); - } else { - nr = file->f_op->write(file, iovec.iov_base, - iovec.iov_len, io_kiocb_ppos(kiocb)); - } - - if (nr < 0) { - if (!ret) - ret = nr; - break; - } - ret += nr; - if (!iov_iter_is_bvec(iter)) { - iov_iter_advance(iter, nr); - } else { - req->rw.addr += nr; - req->rw.len -= nr; - if (!req->rw.len) - break; - } - if (nr != iovec.iov_len) - break; - } - - return ret; -} - -static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, - const struct iovec *fast_iov, struct iov_iter *iter) -{ - struct io_async_rw *rw = req->async_data; - - memcpy(&rw->iter, iter, sizeof(*iter)); - rw->free_iovec = iovec; - rw->bytes_done = 0; - /* can only be fixed buffers, no need to do anything */ - if (iov_iter_is_bvec(iter)) - return; - if (!iovec) { - unsigned iov_off = 0; - - rw->iter.iov = rw->fast_iov; - if (iter->iov != fast_iov) { - iov_off = iter->iov - fast_iov; - rw->iter.iov += iov_off; - } - if (rw->fast_iov != fast_iov) - memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, - sizeof(struct iovec) * iter->nr_segs); - } else { - req->flags |= REQ_F_NEED_CLEANUP; - } -} - -static inline int io_alloc_async_data(struct io_kiocb *req) -{ - WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); - req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); - return req->async_data == NULL; -} - -static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, - const struct iovec *fast_iov, - struct iov_iter *iter, bool force) -{ - if (!force && !io_op_defs[req->opcode].needs_async_setup) - return 0; - if (!req->async_data) { - struct io_async_rw *iorw; - - if (io_alloc_async_data(req)) { - kfree(iovec); - return -ENOMEM; - } - - io_req_map_rw(req, iovec, fast_iov, iter); - iorw = req->async_data; - /* we've copied and mapped the iter, ensure state is saved */ - iov_iter_save_state(&iorw->iter, &iorw->iter_state); - } - return 0; -} - -static inline int io_rw_prep_async(struct io_kiocb *req, int rw) -{ - struct io_async_rw *iorw = req->async_data; - struct iovec *iov = iorw->fast_iov; - int ret; - - ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); - if (unlikely(ret < 0)) - return ret; - - iorw->bytes_done = 0; - iorw->free_iovec = iov; - if (iov) - req->flags |= REQ_F_NEED_CLEANUP; - iov_iter_save_state(&iorw->iter, &iorw->iter_state); - return 0; -} - -static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - if (unlikely(!(req->file->f_mode & FMODE_READ))) - return -EBADF; - return io_prep_rw(req, sqe, READ); -} - -/* - * This is our waitqueue callback handler, registered through lock_page_async() - * when we initially tried to do the IO with the iocb armed our waitqueue. - * This gets called when the page is unlocked, and we generally expect that to - * happen when the page IO is completed and the page is now uptodate. This will - * queue a task_work based retry of the operation, attempting to copy the data - * again. If the latter fails because the page was NOT uptodate, then we will - * do a thread based blocking retry of the operation. That's the unexpected - * slow path. - */ -static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, - int sync, void *arg) -{ - struct wait_page_queue *wpq; - struct io_kiocb *req = wait->private; - struct wait_page_key *key = arg; - - wpq = container_of(wait, struct wait_page_queue, wait); - - if (!wake_page_match(wpq, key)) - return 0; - - req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; - list_del_init(&wait->entry); - io_req_task_queue(req); - return 1; -} - -/* - * This controls whether a given IO request should be armed for async page - * based retry. If we return false here, the request is handed to the async - * worker threads for retry. If we're doing buffered reads on a regular file, - * we prepare a private wait_page_queue entry and retry the operation. This - * will either succeed because the page is now uptodate and unlocked, or it - * will register a callback when the page is unlocked at IO completion. Through - * that callback, io_uring uses task_work to setup a retry of the operation. - * That retry will attempt the buffered read again. The retry will generally - * succeed, or in rare cases where it fails, we then fall back to using the - * async worker threads for a blocking retry. - */ -static bool io_rw_should_retry(struct io_kiocb *req) -{ - struct io_async_rw *rw = req->async_data; - struct wait_page_queue *wait = &rw->wpq; - struct kiocb *kiocb = &req->rw.kiocb; - - /* never retry for NOWAIT, we just complete with -EAGAIN */ - if (req->flags & REQ_F_NOWAIT) - return false; - - /* Only for buffered IO */ - if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) - return false; - - /* - * just use poll if we can, and don't attempt if the fs doesn't - * support callback based unlocks - */ - if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) - return false; - - wait->wait.func = io_async_buf_func; - wait->wait.private = req; - wait->wait.flags = 0; - INIT_LIST_HEAD(&wait->wait.entry); - kiocb->ki_flags |= IOCB_WAITQ; - kiocb->ki_flags &= ~IOCB_NOWAIT; - kiocb->ki_waitq = wait; - return true; -} - -static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) -{ - if (req->file->f_op->read_iter) - return call_read_iter(req->file, &req->rw.kiocb, iter); - else if (req->file->f_op->read) - return loop_rw_iter(READ, req, iter); - else - return -EINVAL; -} - -static bool need_read_all(struct io_kiocb *req) -{ - return req->flags & REQ_F_ISREG || - S_ISBLK(file_inode(req->file)->i_mode); -} - -static int io_read(struct io_kiocb *req, unsigned int issue_flags) -{ - struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; - struct kiocb *kiocb = &req->rw.kiocb; - struct iov_iter __iter, *iter = &__iter; - struct io_async_rw *rw = req->async_data; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - struct iov_iter_state __state, *state; - ssize_t ret, ret2; - - if (rw) { - iter = &rw->iter; - state = &rw->iter_state; - /* - * We come here from an earlier attempt, restore our state to - * match in case it doesn't. It's cheap enough that we don't - * need to make this conditional. - */ - iov_iter_restore(iter, state); - iovec = NULL; - } else { - ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); - if (ret < 0) - return ret; - state = &__state; - iov_iter_save_state(iter, state); - } - req->result = iov_iter_count(iter); - - /* Ensure we clear previously set non-block flag */ - if (!force_nonblock) - kiocb->ki_flags &= ~IOCB_NOWAIT; - else - kiocb->ki_flags |= IOCB_NOWAIT; - - /* If the file doesn't support async, just async punt */ - if (force_nonblock && !io_file_supports_nowait(req, READ)) { - ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); - return ret ?: -EAGAIN; - } - - ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); - if (unlikely(ret)) { - kfree(iovec); - return ret; - } - - ret = io_iter_do_read(req, iter); - - if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { - req->flags &= ~REQ_F_REISSUE; - /* IOPOLL retry should happen for io-wq threads */ - if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) - goto done; - /* no retry on NONBLOCK nor RWF_NOWAIT */ - if (req->flags & REQ_F_NOWAIT) - goto done; - ret = 0; - } else if (ret == -EIOCBQUEUED) { - goto out_free; - } else if (ret <= 0 || ret == req->result || !force_nonblock || - (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { - /* read all, failed, already did sync or don't want to retry */ - goto done; - } - - /* - * Don't depend on the iter state matching what was consumed, or being - * untouched in case of error. Restore it and we'll advance it - * manually if we need to. - */ - iov_iter_restore(iter, state); - - ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); - if (ret2) - return ret2; - - iovec = NULL; - rw = req->async_data; - /* - * Now use our persistent iterator and state, if we aren't already. - * We've restored and mapped the iter to match. - */ - if (iter != &rw->iter) { - iter = &rw->iter; - state = &rw->iter_state; - } - - do { - /* - * We end up here because of a partial read, either from - * above or inside this loop. Advance the iter by the bytes - * that were consumed. - */ - iov_iter_advance(iter, ret); - if (!iov_iter_count(iter)) - break; - rw->bytes_done += ret; - iov_iter_save_state(iter, state); - - /* if we can retry, do so with the callbacks armed */ - if (!io_rw_should_retry(req)) { - kiocb->ki_flags &= ~IOCB_WAITQ; - return -EAGAIN; - } - - req->result = iov_iter_count(iter); - /* - * Now retry read with the IOCB_WAITQ parts set in the iocb. If - * we get -EIOCBQUEUED, then we'll get a notification when the - * desired page gets unlocked. We can also get a partial read - * here, and if we do, then just retry at the new offset. - */ - ret = io_iter_do_read(req, iter); - if (ret == -EIOCBQUEUED) - return 0; - /* we got some bytes, but not all. retry. */ - kiocb->ki_flags &= ~IOCB_WAITQ; - iov_iter_restore(iter, state); - } while (ret > 0); -done: - kiocb_done(kiocb, ret, issue_flags); -out_free: - /* it's faster to check here then delegate to kfree */ - if (iovec) - kfree(iovec); - return 0; -} - -static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - if (unlikely(!(req->file->f_mode & FMODE_WRITE))) - return -EBADF; - return io_prep_rw(req, sqe, WRITE); -} - -static int io_write(struct io_kiocb *req, unsigned int issue_flags) -{ - struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; - struct kiocb *kiocb = &req->rw.kiocb; - struct iov_iter __iter, *iter = &__iter; - struct io_async_rw *rw = req->async_data; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - struct iov_iter_state __state, *state; - ssize_t ret, ret2; - - if (rw) { - iter = &rw->iter; - state = &rw->iter_state; - iov_iter_restore(iter, state); - iovec = NULL; - } else { - ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); - if (ret < 0) - return ret; - state = &__state; - iov_iter_save_state(iter, state); - } - req->result = iov_iter_count(iter); - - /* Ensure we clear previously set non-block flag */ - if (!force_nonblock) - kiocb->ki_flags &= ~IOCB_NOWAIT; - else - kiocb->ki_flags |= IOCB_NOWAIT; - - /* If the file doesn't support async, just async punt */ - if (force_nonblock && !io_file_supports_nowait(req, WRITE)) - goto copy_iov; - - /* file path doesn't support NOWAIT for non-direct_IO */ - if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && - (req->flags & REQ_F_ISREG)) - goto copy_iov; - - ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); - if (unlikely(ret)) - goto out_free; - - /* - * Open-code file_start_write here to grab freeze protection, - * which will be released by another thread in - * io_complete_rw(). Fool lockdep by telling it the lock got - * released so that it doesn't complain about the held lock when - * we return to userspace. - */ - if (req->flags & REQ_F_ISREG) { - sb_start_write(file_inode(req->file)->i_sb); - __sb_writers_release(file_inode(req->file)->i_sb, - SB_FREEZE_WRITE); - } - kiocb->ki_flags |= IOCB_WRITE; - - if (req->file->f_op->write_iter) - ret2 = call_write_iter(req->file, kiocb, iter); - else if (req->file->f_op->write) - ret2 = loop_rw_iter(WRITE, req, iter); - else - ret2 = -EINVAL; - - if (req->flags & REQ_F_REISSUE) { - req->flags &= ~REQ_F_REISSUE; - ret2 = -EAGAIN; - } - - /* - * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just - * retry them without IOCB_NOWAIT. - */ - if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) - ret2 = -EAGAIN; - /* no retry on NONBLOCK nor RWF_NOWAIT */ - if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) - goto done; - if (!force_nonblock || ret2 != -EAGAIN) { - /* IOPOLL retry should happen for io-wq threads */ - if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) - goto copy_iov; -done: - kiocb_done(kiocb, ret2, issue_flags); - } else { -copy_iov: - iov_iter_restore(iter, state); - ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); - if (!ret) { - if (kiocb->ki_flags & IOCB_WRITE) - kiocb_end_write(req); - return -EAGAIN; - } - return ret; - } -out_free: - /* it's reportedly faster than delegating the null check to kfree() */ - if (iovec) - kfree(iovec); - return ret; -} - -static int io_renameat_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_rename *ren = &req->rename; - const char __user *oldf, *newf; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - ren->old_dfd = READ_ONCE(sqe->fd); - oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); - newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - ren->new_dfd = READ_ONCE(sqe->len); - ren->flags = READ_ONCE(sqe->rename_flags); - - ren->oldpath = getname(oldf); - if (IS_ERR(ren->oldpath)) - return PTR_ERR(ren->oldpath); - - ren->newpath = getname(newf); - if (IS_ERR(ren->newpath)) { - putname(ren->oldpath); - return PTR_ERR(ren->newpath); - } - - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_rename *ren = &req->rename; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, - ren->newpath, ren->flags); - - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_unlinkat_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_unlink *un = &req->unlink; - const char __user *fname; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || - sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - un->dfd = READ_ONCE(sqe->fd); - - un->flags = READ_ONCE(sqe->unlink_flags); - if (un->flags & ~AT_REMOVEDIR) - return -EINVAL; - - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); - un->filename = getname(fname); - if (IS_ERR(un->filename)) - return PTR_ERR(un->filename); - - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_unlink *un = &req->unlink; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - if (un->flags & AT_REMOVEDIR) - ret = do_rmdir(un->dfd, un->filename); - else - ret = do_unlinkat(un->dfd, un->filename); - - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_mkdirat_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_mkdir *mkd = &req->mkdir; - const char __user *fname; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || - sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - mkd->dfd = READ_ONCE(sqe->fd); - mkd->mode = READ_ONCE(sqe->len); - - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); - mkd->filename = getname(fname); - if (IS_ERR(mkd->filename)) - return PTR_ERR(mkd->filename); - - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_mkdirat(struct io_kiocb *req, int issue_flags) -{ - struct io_mkdir *mkd = &req->mkdir; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); - - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_symlinkat_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_symlink *sl = &req->symlink; - const char __user *oldpath, *newpath; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || - sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - sl->new_dfd = READ_ONCE(sqe->fd); - oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); - newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - - sl->oldpath = getname(oldpath); - if (IS_ERR(sl->oldpath)) - return PTR_ERR(sl->oldpath); - - sl->newpath = getname(newpath); - if (IS_ERR(sl->newpath)) { - putname(sl->oldpath); - return PTR_ERR(sl->newpath); - } - - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_symlinkat(struct io_kiocb *req, int issue_flags) -{ - struct io_symlink *sl = &req->symlink; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); - - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_linkat_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_hardlink *lnk = &req->hardlink; - const char __user *oldf, *newf; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - lnk->old_dfd = READ_ONCE(sqe->fd); - lnk->new_dfd = READ_ONCE(sqe->len); - oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); - newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - lnk->flags = READ_ONCE(sqe->hardlink_flags); - - lnk->oldpath = getname(oldf); - if (IS_ERR(lnk->oldpath)) - return PTR_ERR(lnk->oldpath); - - lnk->newpath = getname(newf); - if (IS_ERR(lnk->newpath)) { - putname(lnk->oldpath); - return PTR_ERR(lnk->newpath); - } - - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_linkat(struct io_kiocb *req, int issue_flags) -{ - struct io_hardlink *lnk = &req->hardlink; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, - lnk->newpath, lnk->flags); - - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_shutdown_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ -#if defined(CONFIG_NET) - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || - sqe->buf_index || sqe->splice_fd_in)) - return -EINVAL; - - req->shutdown.how = READ_ONCE(sqe->len); - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) -{ -#if defined(CONFIG_NET) - struct socket *sock; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - sock = sock_from_file(req->file); - if (unlikely(!sock)) - return -ENOTSOCK; - - ret = __sys_shutdown_sock(sock, req->shutdown.how); - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int __io_splice_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_splice *sp = &req->splice; - unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - sp->len = READ_ONCE(sqe->len); - sp->flags = READ_ONCE(sqe->splice_flags); - if (unlikely(sp->flags & ~valid_flags)) - return -EINVAL; - sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); - return 0; -} - -static int io_tee_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) - return -EINVAL; - return __io_splice_prep(req, sqe); -} - -static int io_tee(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_splice *sp = &req->splice; - struct file *out = sp->file_out; - unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; - struct file *in; - long ret = 0; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - in = io_file_get(req->ctx, req, sp->splice_fd_in, - (sp->flags & SPLICE_F_FD_IN_FIXED)); - if (!in) { - ret = -EBADF; - goto done; - } - - if (sp->len) - ret = do_tee(in, out, sp->len, flags); - - if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) - io_put_file(in); -done: - if (ret != sp->len) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_splice *sp = &req->splice; - - sp->off_in = READ_ONCE(sqe->splice_off_in); - sp->off_out = READ_ONCE(sqe->off); - return __io_splice_prep(req, sqe); -} - -static int io_splice(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_splice *sp = &req->splice; - struct file *out = sp->file_out; - unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; - loff_t *poff_in, *poff_out; - struct file *in; - long ret = 0; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - in = io_file_get(req->ctx, req, sp->splice_fd_in, - (sp->flags & SPLICE_F_FD_IN_FIXED)); - if (!in) { - ret = -EBADF; - goto done; - } - - poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; - poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; - - if (sp->len) - ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); - - if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) - io_put_file(in); -done: - if (ret != sp->len) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -/* - * IORING_OP_NOP just posts a completion event, nothing else. - */ -static int io_nop(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - - if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - __io_req_complete(req, issue_flags, 0, 0); - return 0; -} - -static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_ring_ctx *ctx = req->ctx; - - if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || - sqe->splice_fd_in)) - return -EINVAL; - - req->sync.flags = READ_ONCE(sqe->fsync_flags); - if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) - return -EINVAL; - - req->sync.off = READ_ONCE(sqe->off); - req->sync.len = READ_ONCE(sqe->len); - return 0; -} - -static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) -{ - loff_t end = req->sync.off + req->sync.len; - int ret; - - /* fsync always requires a blocking context */ - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = vfs_fsync_range(req->file, req->sync.off, - end > 0 ? end : LLONG_MAX, - req->sync.flags & IORING_FSYNC_DATASYNC); - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_fallocate_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || - sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - req->sync.off = READ_ONCE(sqe->off); - req->sync.len = READ_ONCE(sqe->addr); - req->sync.mode = READ_ONCE(sqe->len); - return 0; -} - -static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) -{ - int ret; - - /* fallocate always requiring blocking context */ - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, - req->sync.len); - if (ret < 0) - req_set_fail(req); - else - fsnotify_modify(req->file); - io_req_complete(req, ret); - return 0; -} - -static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - const char __user *fname; - int ret; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->ioprio || sqe->buf_index)) - return -EINVAL; - if (unlikely(req->flags & REQ_F_FIXED_FILE)) - return -EBADF; - - /* open.how should be already initialised */ - if (!(req->open.how.flags & O_PATH) && force_o_largefile()) - req->open.how.flags |= O_LARGEFILE; - - req->open.dfd = READ_ONCE(sqe->fd); - fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); - req->open.filename = getname(fname); - if (IS_ERR(req->open.filename)) { - ret = PTR_ERR(req->open.filename); - req->open.filename = NULL; - return ret; - } - - req->open.file_slot = READ_ONCE(sqe->file_index); - if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) - return -EINVAL; - - req->open.nofile = rlimit(RLIMIT_NOFILE); - req->flags |= REQ_F_NEED_CLEANUP; - return 0; -} - -static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - u64 mode = READ_ONCE(sqe->len); - u64 flags = READ_ONCE(sqe->open_flags); - - req->open.how = build_open_how(flags, mode); - return __io_openat_prep(req, sqe); -} - -static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct open_how __user *how; - size_t len; - int ret; - - how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - len = READ_ONCE(sqe->len); - if (len < OPEN_HOW_SIZE_VER0) - return -EINVAL; - - ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, - len); - if (ret) - return ret; - - return __io_openat_prep(req, sqe); -} - -static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) -{ - struct open_flags op; - struct file *file; - bool resolve_nonblock, nonblock_set; - bool fixed = !!req->open.file_slot; - int ret; - - ret = build_open_flags(&req->open.how, &op); - if (ret) - goto err; - nonblock_set = op.open_flag & O_NONBLOCK; - resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; - if (issue_flags & IO_URING_F_NONBLOCK) { - /* - * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, - * it'll always -EAGAIN - */ - if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) - return -EAGAIN; - op.lookup_flags |= LOOKUP_CACHED; - op.open_flag |= O_NONBLOCK; - } - - if (!fixed) { - ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); - if (ret < 0) - goto err; - } - - file = do_filp_open(req->open.dfd, req->open.filename, &op); - if (IS_ERR(file)) { - /* - * We could hang on to this 'fd' on retrying, but seems like - * marginal gain for something that is now known to be a slower - * path. So just put it, and we'll get a new one when we retry. - */ - if (!fixed) - put_unused_fd(ret); - - ret = PTR_ERR(file); - /* only retry if RESOLVE_CACHED wasn't already set by application */ - if (ret == -EAGAIN && - (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) - return -EAGAIN; - goto err; - } - - if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) - file->f_flags &= ~O_NONBLOCK; - fsnotify_open(file); - - if (!fixed) - fd_install(ret, file); - else - ret = io_install_fixed_file(req, file, issue_flags, - req->open.file_slot - 1); -err: - putname(req->open.filename); - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < 0) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_openat(struct io_kiocb *req, unsigned int issue_flags) -{ - return io_openat2(req, issue_flags); -} - -static int io_remove_buffers_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_provide_buf *p = &req->pbuf; - u64 tmp; - - if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || - sqe->splice_fd_in) - return -EINVAL; - - tmp = READ_ONCE(sqe->fd); - if (!tmp || tmp > USHRT_MAX) - return -EINVAL; - - memset(p, 0, sizeof(*p)); - p->nbufs = tmp; - p->bgid = READ_ONCE(sqe->buf_group); - return 0; -} - -static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, - int bgid, unsigned nbufs) -{ - unsigned i = 0; - - /* shouldn't happen */ - if (!nbufs) - return 0; - - /* the head kbuf is the list itself */ - while (!list_empty(&buf->list)) { - struct io_buffer *nxt; - - nxt = list_first_entry(&buf->list, struct io_buffer, list); - list_del(&nxt->list); - kfree(nxt); - if (++i == nbufs) - return i; - cond_resched(); - } - i++; - kfree(buf); - xa_erase(&ctx->io_buffers, bgid); - - return i; -} - -static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_provide_buf *p = &req->pbuf; - struct io_ring_ctx *ctx = req->ctx; - struct io_buffer *head; - int ret = 0; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - io_ring_submit_lock(ctx, !force_nonblock); - - lockdep_assert_held(&ctx->uring_lock); - - ret = -ENOENT; - head = xa_load(&ctx->io_buffers, p->bgid); - if (head) - ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); - if (ret < 0) - req_set_fail(req); - - /* complete before unlock, IOPOLL may need the lock */ - __io_req_complete(req, issue_flags, ret, 0); - io_ring_submit_unlock(ctx, !force_nonblock); - return 0; -} - -static int io_provide_buffers_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - unsigned long size, tmp_check; - struct io_provide_buf *p = &req->pbuf; - u64 tmp; - - if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) - return -EINVAL; - - tmp = READ_ONCE(sqe->fd); - if (!tmp || tmp > USHRT_MAX) - return -E2BIG; - p->nbufs = tmp; - p->addr = READ_ONCE(sqe->addr); - p->len = READ_ONCE(sqe->len); - - if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, - &size)) - return -EOVERFLOW; - if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) - return -EOVERFLOW; - - size = (unsigned long)p->len * p->nbufs; - if (!access_ok(u64_to_user_ptr(p->addr), size)) - return -EFAULT; - - p->bgid = READ_ONCE(sqe->buf_group); - tmp = READ_ONCE(sqe->off); - if (tmp > USHRT_MAX) - return -E2BIG; - p->bid = tmp; - return 0; -} - -static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) -{ - struct io_buffer *buf; - u64 addr = pbuf->addr; - int i, bid = pbuf->bid; - - for (i = 0; i < pbuf->nbufs; i++) { - buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); - if (!buf) - break; - - buf->addr = addr; - buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); - buf->bid = bid; - addr += pbuf->len; - bid++; - if (!*head) { - INIT_LIST_HEAD(&buf->list); - *head = buf; - } else { - list_add_tail(&buf->list, &(*head)->list); - } - cond_resched(); - } - - return i ? i : -ENOMEM; -} - -static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_provide_buf *p = &req->pbuf; - struct io_ring_ctx *ctx = req->ctx; - struct io_buffer *head, *list; - int ret = 0; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - io_ring_submit_lock(ctx, !force_nonblock); - - lockdep_assert_held(&ctx->uring_lock); - - list = head = xa_load(&ctx->io_buffers, p->bgid); - - ret = io_add_buffers(p, &head); - if (ret >= 0 && !list) { - ret = xa_insert(&ctx->io_buffers, p->bgid, head, - GFP_KERNEL_ACCOUNT); - if (ret < 0) - __io_remove_buffers(ctx, head, p->bgid, -1U); - } - if (ret < 0) - req_set_fail(req); - /* complete before unlock, IOPOLL may need the lock */ - __io_req_complete(req, issue_flags, ret, 0); - io_ring_submit_unlock(ctx, !force_nonblock); - return 0; -} - -static int io_epoll_ctl_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ -#if defined(CONFIG_EPOLL) - if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - req->epoll.epfd = READ_ONCE(sqe->fd); - req->epoll.op = READ_ONCE(sqe->len); - req->epoll.fd = READ_ONCE(sqe->off); - - if (ep_op_has_event(req->epoll.op)) { - struct epoll_event __user *ev; - - ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); - if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) - return -EFAULT; - } - - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) -{ -#if defined(CONFIG_EPOLL) - struct io_epoll *ie = &req->epoll; - int ret; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); - if (force_nonblock && ret == -EAGAIN) - return -EAGAIN; - - if (ret < 0) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ -#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) - if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - req->madvise.addr = READ_ONCE(sqe->addr); - req->madvise.len = READ_ONCE(sqe->len); - req->madvise.advice = READ_ONCE(sqe->fadvise_advice); - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) -{ -#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) - struct io_madvise *ma = &req->madvise; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -#else - return -EOPNOTSUPP; -#endif -} - -static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) - return -EINVAL; - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - - req->fadvise.offset = READ_ONCE(sqe->off); - req->fadvise.len = READ_ONCE(sqe->len); - req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); - return 0; -} - -static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_fadvise *fa = &req->fadvise; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) { - switch (fa->advice) { - case POSIX_FADV_NORMAL: - case POSIX_FADV_RANDOM: - case POSIX_FADV_SEQUENTIAL: - break; - default: - return -EAGAIN; - } - } - - ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); - if (ret < 0) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) - return -EINVAL; - if (req->flags & REQ_F_FIXED_FILE) - return -EBADF; - - req->statx.dfd = READ_ONCE(sqe->fd); - req->statx.mask = READ_ONCE(sqe->len); - req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); - req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - req->statx.flags = READ_ONCE(sqe->statx_flags); - - return 0; -} - -static int io_statx(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_statx *ctx = &req->statx; - int ret; - - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, - ctx->buffer); - - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || - sqe->rw_flags || sqe->buf_index) - return -EINVAL; - if (req->flags & REQ_F_FIXED_FILE) - return -EBADF; - - req->close.fd = READ_ONCE(sqe->fd); - req->close.file_slot = READ_ONCE(sqe->file_index); - if (req->close.file_slot && req->close.fd) - return -EINVAL; - - return 0; -} - -static int io_close(struct io_kiocb *req, unsigned int issue_flags) -{ - struct files_struct *files = current->files; - struct io_close *close = &req->close; - struct fdtable *fdt; - struct file *file = NULL; - int ret = -EBADF; - - if (req->close.file_slot) { - ret = io_close_fixed(req, issue_flags); - goto err; - } - - spin_lock(&files->file_lock); - fdt = files_fdtable(files); - if (close->fd >= fdt->max_fds) { - spin_unlock(&files->file_lock); - goto err; - } - file = fdt->fd[close->fd]; - if (!file || file->f_op == &io_uring_fops) { - spin_unlock(&files->file_lock); - file = NULL; - goto err; - } - - /* if the file has a flush method, be safe and punt to async */ - if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { - spin_unlock(&files->file_lock); - return -EAGAIN; - } - - ret = __close_fd_get_file(close->fd, &file); - spin_unlock(&files->file_lock); - if (ret < 0) { - if (ret == -ENOENT) - ret = -EBADF; - goto err; - } - - /* No ->flush() or already async, safely close from here */ - ret = filp_close(file, current->files); -err: - if (ret < 0) - req_set_fail(req); - if (file) - fput(file); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_ring_ctx *ctx = req->ctx; - - if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || - sqe->splice_fd_in)) - return -EINVAL; - - req->sync.off = READ_ONCE(sqe->off); - req->sync.len = READ_ONCE(sqe->len); - req->sync.flags = READ_ONCE(sqe->sync_range_flags); - return 0; -} - -static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) -{ - int ret; - - /* sync_file_range always requires a blocking context */ - if (issue_flags & IO_URING_F_NONBLOCK) - return -EAGAIN; - - ret = sync_file_range(req->file, req->sync.off, req->sync.len, - req->sync.flags); - if (ret < 0) - req_set_fail(req); - io_req_complete(req, ret); - return 0; -} - -#if defined(CONFIG_NET) -static int io_setup_async_msg(struct io_kiocb *req, - struct io_async_msghdr *kmsg) -{ - struct io_async_msghdr *async_msg = req->async_data; - - if (async_msg) - return -EAGAIN; - if (io_alloc_async_data(req)) { - kfree(kmsg->free_iov); - return -ENOMEM; - } - async_msg = req->async_data; - req->flags |= REQ_F_NEED_CLEANUP; - memcpy(async_msg, kmsg, sizeof(*kmsg)); - if (async_msg->msg.msg_name) - async_msg->msg.msg_name = &async_msg->addr; - /* if were using fast_iov, set it to the new one */ - if (!async_msg->free_iov) - async_msg->msg.msg_iter.iov = async_msg->fast_iov; - - return -EAGAIN; -} - -static int io_sendmsg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg) -{ - iomsg->msg.msg_name = &iomsg->addr; - iomsg->free_iov = iomsg->fast_iov; - return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, - req->sr_msg.msg_flags, &iomsg->free_iov); -} - -static int io_sendmsg_prep_async(struct io_kiocb *req) -{ - int ret; - - ret = io_sendmsg_copy_hdr(req, req->async_data); - if (!ret) - req->flags |= REQ_F_NEED_CLEANUP; - return ret; -} - -static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_sr_msg *sr = &req->sr_msg; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->addr2 || sqe->file_index)) - return -EINVAL; - if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio)) - return -EINVAL; - - sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); - sr->len = READ_ONCE(sqe->len); - sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; - if (sr->msg_flags & MSG_DONTWAIT) - req->flags |= REQ_F_NOWAIT; - -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - sr->msg_flags |= MSG_CMSG_COMPAT; -#endif - return 0; -} - -static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_async_msghdr iomsg, *kmsg; - struct socket *sock; - unsigned flags; - int min_ret = 0; - int ret; - - sock = sock_from_file(req->file); - if (unlikely(!sock)) - return -ENOTSOCK; - - kmsg = req->async_data; - if (!kmsg) { - ret = io_sendmsg_copy_hdr(req, &iomsg); - if (ret) - return ret; - kmsg = &iomsg; - } - - flags = req->sr_msg.msg_flags; - if (issue_flags & IO_URING_F_NONBLOCK) - flags |= MSG_DONTWAIT; - if (flags & MSG_WAITALL) - min_ret = iov_iter_count(&kmsg->msg.msg_iter); - - ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); - if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) - return io_setup_async_msg(req, kmsg); - if (ret == -ERESTARTSYS) - ret = -EINTR; - - /* fast path, check for non-NULL to avoid function call */ - if (kmsg->free_iov) - kfree(kmsg->free_iov); - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < min_ret) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_send(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_sr_msg *sr = &req->sr_msg; - struct msghdr msg; - struct iovec iov; - struct socket *sock; - unsigned flags; - int min_ret = 0; - int ret; - - sock = sock_from_file(req->file); - if (unlikely(!sock)) - return -ENOTSOCK; - - ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); - if (unlikely(ret)) - return ret; - - msg.msg_name = NULL; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_namelen = 0; - - flags = req->sr_msg.msg_flags; - if (issue_flags & IO_URING_F_NONBLOCK) - flags |= MSG_DONTWAIT; - if (flags & MSG_WAITALL) - min_ret = iov_iter_count(&msg.msg_iter); - - msg.msg_flags = flags; - ret = sock_sendmsg(sock, &msg); - if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) - return -EAGAIN; - if (ret == -ERESTARTSYS) - ret = -EINTR; - - if (ret < min_ret) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int __io_recvmsg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg) -{ - struct io_sr_msg *sr = &req->sr_msg; - struct iovec __user *uiov; - size_t iov_len; - int ret; - - ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, - &iomsg->uaddr, &uiov, &iov_len); - if (ret) - return ret; - - if (req->flags & REQ_F_BUFFER_SELECT) { - if (iov_len > 1) - return -EINVAL; - if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) - return -EFAULT; - sr->len = iomsg->fast_iov[0].iov_len; - iomsg->free_iov = NULL; - } else { - iomsg->free_iov = iomsg->fast_iov; - ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, - &iomsg->free_iov, &iomsg->msg.msg_iter, - false); - if (ret > 0) - ret = 0; - } - - return ret; -} - -#ifdef CONFIG_COMPAT -static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg) -{ - struct io_sr_msg *sr = &req->sr_msg; - struct compat_iovec __user *uiov; - compat_uptr_t ptr; - compat_size_t len; - int ret; - - ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, - &ptr, &len); - if (ret) - return ret; - - uiov = compat_ptr(ptr); - if (req->flags & REQ_F_BUFFER_SELECT) { - compat_ssize_t clen; - - if (len > 1) - return -EINVAL; - if (!access_ok(uiov, sizeof(*uiov))) - return -EFAULT; - if (__get_user(clen, &uiov->iov_len)) - return -EFAULT; - if (clen < 0) - return -EINVAL; - sr->len = clen; - iomsg->free_iov = NULL; - } else { - iomsg->free_iov = iomsg->fast_iov; - ret = __import_iovec(READ, (struct iovec __user *)uiov, len, - UIO_FASTIOV, &iomsg->free_iov, - &iomsg->msg.msg_iter, true); - if (ret < 0) - return ret; - } - - return 0; -} -#endif - -static int io_recvmsg_copy_hdr(struct io_kiocb *req, - struct io_async_msghdr *iomsg) -{ - iomsg->msg.msg_name = &iomsg->addr; - -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - return __io_compat_recvmsg_copy_hdr(req, iomsg); -#endif - - return __io_recvmsg_copy_hdr(req, iomsg); -} - -static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, - bool needs_lock) -{ - struct io_sr_msg *sr = &req->sr_msg; - struct io_buffer *kbuf; - - kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); - if (IS_ERR(kbuf)) - return kbuf; - - sr->kbuf = kbuf; - req->flags |= REQ_F_BUFFER_SELECTED; - return kbuf; -} - -static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) -{ - return io_put_kbuf(req, req->sr_msg.kbuf); -} - -static int io_recvmsg_prep_async(struct io_kiocb *req) -{ - int ret; - - ret = io_recvmsg_copy_hdr(req, req->async_data); - if (!ret) - req->flags |= REQ_F_NEED_CLEANUP; - return ret; -} - -static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_sr_msg *sr = &req->sr_msg; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(sqe->addr2 || sqe->file_index)) - return -EINVAL; - if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio)) - return -EINVAL; - - sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); - sr->len = READ_ONCE(sqe->len); - sr->bgid = READ_ONCE(sqe->buf_group); - sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; - if (sr->msg_flags & MSG_DONTWAIT) - req->flags |= REQ_F_NOWAIT; - -#ifdef CONFIG_COMPAT - if (req->ctx->compat) - sr->msg_flags |= MSG_CMSG_COMPAT; -#endif - return 0; -} - -static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_async_msghdr iomsg, *kmsg; - struct socket *sock; - struct io_buffer *kbuf; - unsigned flags; - int min_ret = 0; - int ret, cflags = 0; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - sock = sock_from_file(req->file); - if (unlikely(!sock)) - return -ENOTSOCK; - - kmsg = req->async_data; - if (!kmsg) { - ret = io_recvmsg_copy_hdr(req, &iomsg); - if (ret) - return ret; - kmsg = &iomsg; - } - - if (req->flags & REQ_F_BUFFER_SELECT) { - kbuf = io_recv_buffer_select(req, !force_nonblock); - if (IS_ERR(kbuf)) - return PTR_ERR(kbuf); - kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); - kmsg->fast_iov[0].iov_len = req->sr_msg.len; - iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, - 1, req->sr_msg.len); - } - - flags = req->sr_msg.msg_flags; - if (force_nonblock) - flags |= MSG_DONTWAIT; - if (flags & MSG_WAITALL) - min_ret = iov_iter_count(&kmsg->msg.msg_iter); - - ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, - kmsg->uaddr, flags); - if (force_nonblock && ret == -EAGAIN) - return io_setup_async_msg(req, kmsg); - if (ret == -ERESTARTSYS) - ret = -EINTR; - - if (req->flags & REQ_F_BUFFER_SELECTED) - cflags = io_put_recv_kbuf(req); - /* fast path, check for non-NULL to avoid function call */ - if (kmsg->free_iov) - kfree(kmsg->free_iov); - req->flags &= ~REQ_F_NEED_CLEANUP; - if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, cflags); - return 0; -} - -static int io_recv(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_buffer *kbuf; - struct io_sr_msg *sr = &req->sr_msg; - struct msghdr msg; - void __user *buf = sr->buf; - struct socket *sock; - struct iovec iov; - unsigned flags; - int min_ret = 0; - int ret, cflags = 0; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - sock = sock_from_file(req->file); - if (unlikely(!sock)) - return -ENOTSOCK; - - if (req->flags & REQ_F_BUFFER_SELECT) { - kbuf = io_recv_buffer_select(req, !force_nonblock); - if (IS_ERR(kbuf)) - return PTR_ERR(kbuf); - buf = u64_to_user_ptr(kbuf->addr); - } - - ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); - if (unlikely(ret)) - goto out_free; - - msg.msg_name = NULL; - msg.msg_control = NULL; - msg.msg_controllen = 0; - msg.msg_namelen = 0; - msg.msg_iocb = NULL; - msg.msg_flags = 0; - - flags = req->sr_msg.msg_flags; - if (force_nonblock) - flags |= MSG_DONTWAIT; - if (flags & MSG_WAITALL) - min_ret = iov_iter_count(&msg.msg_iter); - - ret = sock_recvmsg(sock, &msg, flags); - if (force_nonblock && ret == -EAGAIN) - return -EAGAIN; - if (ret == -ERESTARTSYS) - ret = -EINTR; -out_free: - if (req->flags & REQ_F_BUFFER_SELECTED) - cflags = io_put_recv_kbuf(req); - if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, cflags); - return 0; -} - -static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_accept *accept = &req->accept; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->len || sqe->buf_index) - return -EINVAL; - - accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); - accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); - accept->flags = READ_ONCE(sqe->accept_flags); - accept->nofile = rlimit(RLIMIT_NOFILE); - - accept->file_slot = READ_ONCE(sqe->file_index); - if (accept->file_slot && (accept->flags & SOCK_CLOEXEC)) - return -EINVAL; - if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) - return -EINVAL; - if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) - accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; - return 0; -} - -static int io_accept(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_accept *accept = &req->accept; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; - bool fixed = !!accept->file_slot; - struct file *file; - int ret, fd; - - if (req->file->f_flags & O_NONBLOCK) - req->flags |= REQ_F_NOWAIT; - - if (!fixed) { - fd = __get_unused_fd_flags(accept->flags, accept->nofile); - if (unlikely(fd < 0)) - return fd; - } - file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, - accept->flags); - if (IS_ERR(file)) { - if (!fixed) - put_unused_fd(fd); - ret = PTR_ERR(file); - if (ret == -EAGAIN && force_nonblock) - return -EAGAIN; - if (ret == -ERESTARTSYS) - ret = -EINTR; - req_set_fail(req); - } else if (!fixed) { - fd_install(fd, file); - ret = fd; - } else { - ret = io_install_fixed_file(req, file, issue_flags, - accept->file_slot - 1); - } - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_connect_prep_async(struct io_kiocb *req) -{ - struct io_async_connect *io = req->async_data; - struct io_connect *conn = &req->connect; - - return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); -} - -static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_connect *conn = &req->connect; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || - sqe->splice_fd_in) - return -EINVAL; - - conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); - conn->addr_len = READ_ONCE(sqe->addr2); - return 0; -} - -static int io_connect(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_async_connect __io, *io; - unsigned file_flags; - int ret; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - - if (req->async_data) { - io = req->async_data; - } else { - ret = move_addr_to_kernel(req->connect.addr, - req->connect.addr_len, - &__io.address); - if (ret) - goto out; - io = &__io; - } - - file_flags = force_nonblock ? O_NONBLOCK : 0; - - ret = __sys_connect_file(req->file, &io->address, - req->connect.addr_len, file_flags); - if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { - if (req->async_data) - return -EAGAIN; - if (io_alloc_async_data(req)) { - ret = -ENOMEM; - goto out; - } - memcpy(req->async_data, &__io, sizeof(__io)); - return -EAGAIN; - } - if (ret == -ERESTARTSYS) - ret = -EINTR; -out: - if (ret < 0) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} -#else /* !CONFIG_NET */ -#define IO_NETOP_FN(op) \ -static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ -{ \ - return -EOPNOTSUPP; \ -} - -#define IO_NETOP_PREP(op) \ -IO_NETOP_FN(op) \ -static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ -{ \ - return -EOPNOTSUPP; \ -} \ - -#define IO_NETOP_PREP_ASYNC(op) \ -IO_NETOP_PREP(op) \ -static int io_##op##_prep_async(struct io_kiocb *req) \ -{ \ - return -EOPNOTSUPP; \ -} - -IO_NETOP_PREP_ASYNC(sendmsg); -IO_NETOP_PREP_ASYNC(recvmsg); -IO_NETOP_PREP_ASYNC(connect); -IO_NETOP_PREP(accept); -IO_NETOP_FN(send); -IO_NETOP_FN(recv); -#endif /* CONFIG_NET */ - -struct io_poll_table { - struct poll_table_struct pt; - struct io_kiocb *req; - int nr_entries; - int error; -}; - -#define IO_POLL_CANCEL_FLAG BIT(31) -#define IO_POLL_RETRY_FLAG BIT(30) -#define IO_POLL_REF_MASK GENMASK(29, 0) - -/* - * We usually have 1-2 refs taken, 128 is more than enough and we want to - * maximise the margin between this amount and the moment when it overflows. - */ -#define IO_POLL_REF_BIAS 128 - -static bool io_poll_get_ownership_slowpath(struct io_kiocb *req) -{ - int v; - - /* - * poll_refs are already elevated and we don't have much hope for - * grabbing the ownership. Instead of incrementing set a retry flag - * to notify the loop that there might have been some change. - */ - v = atomic_fetch_or(IO_POLL_RETRY_FLAG, &req->poll_refs); - if (v & IO_POLL_REF_MASK) - return false; - return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); -} - -/* - * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can - * bump it and acquire ownership. It's disallowed to modify requests while not - * owning it, that prevents from races for enqueueing task_work's and b/w - * arming poll and wakeups. - */ -static inline bool io_poll_get_ownership(struct io_kiocb *req) -{ - if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) - return io_poll_get_ownership_slowpath(req); - return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); -} - -static void io_poll_mark_cancelled(struct io_kiocb *req) -{ - atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); -} - -static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) -{ - /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ - if (req->opcode == IORING_OP_POLL_ADD) - return req->async_data; - return req->apoll->double_poll; -} - -static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) -{ - if (req->opcode == IORING_OP_POLL_ADD) - return &req->poll; - return &req->apoll->poll; -} - -static void io_poll_req_insert(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - struct hlist_head *list; - - list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; - hlist_add_head(&req->hash_node, list); -} - -static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, - wait_queue_func_t wake_func) -{ - poll->head = NULL; -#define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) - /* mask in events that we always want/need */ - poll->events = events | IO_POLL_UNMASK; - INIT_LIST_HEAD(&poll->wait.entry); - init_waitqueue_func_entry(&poll->wait, wake_func); -} - -static inline void io_poll_remove_entry(struct io_poll_iocb *poll) -{ - struct wait_queue_head *head = smp_load_acquire(&poll->head); - - if (head) { - spin_lock_irq(&head->lock); - list_del_init(&poll->wait.entry); - poll->head = NULL; - spin_unlock_irq(&head->lock); - } -} - -static void io_poll_remove_entries(struct io_kiocb *req) -{ - struct io_poll_iocb *poll = io_poll_get_single(req); - struct io_poll_iocb *poll_double = io_poll_get_double(req); - - /* - * While we hold the waitqueue lock and the waitqueue is nonempty, - * wake_up_pollfree() will wait for us. However, taking the waitqueue - * lock in the first place can race with the waitqueue being freed. - * - * We solve this as eventpoll does: by taking advantage of the fact that - * all users of wake_up_pollfree() will RCU-delay the actual free. If - * we enter rcu_read_lock() and see that the pointer to the queue is - * non-NULL, we can then lock it without the memory being freed out from - * under us. - * - * Keep holding rcu_read_lock() as long as we hold the queue lock, in - * case the caller deletes the entry from the queue, leaving it empty. - * In that case, only RCU prevents the queue memory from being freed. - */ - rcu_read_lock(); - io_poll_remove_entry(poll); - if (poll_double) - io_poll_remove_entry(poll_double); - rcu_read_unlock(); -} - -/* - * All poll tw should go through this. Checks for poll events, manages - * references, does rewait, etc. - * - * Returns a negative error on failure. >0 when no action require, which is - * either spurious wakeup or multishot CQE is served. 0 when it's done with - * the request, then the mask is stored in req->result. - */ -static int io_poll_check_events(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_poll_iocb *poll = io_poll_get_single(req); - int v; - - /* req->task == current here, checking PF_EXITING is safe */ - if (unlikely(req->task->flags & PF_EXITING)) - io_poll_mark_cancelled(req); - - do { - v = atomic_read(&req->poll_refs); - - /* tw handler should be the owner, and so have some references */ - if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) - return 0; - if (v & IO_POLL_CANCEL_FLAG) - return -ECANCELED; - /* - * cqe.res contains only events of the first wake up - * and all others are be lost. Redo vfs_poll() to get - * up to date state. - */ - if ((v & IO_POLL_REF_MASK) != 1) - req->result = 0; - if (v & IO_POLL_RETRY_FLAG) { - req->result = 0; - /* - * We won't find new events that came in between - * vfs_poll and the ref put unless we clear the - * flag in advance. - */ - atomic_andnot(IO_POLL_RETRY_FLAG, &req->poll_refs); - v &= ~IO_POLL_RETRY_FLAG; - } - - if (!req->result) { - struct poll_table_struct pt = { ._key = poll->events }; - - req->result = vfs_poll(req->file, &pt) & poll->events; - } - - /* multishot, just fill an CQE and proceed */ - if (req->result && !(poll->events & EPOLLONESHOT)) { - __poll_t mask = mangle_poll(req->result & poll->events); - bool filled; - - spin_lock(&ctx->completion_lock); - filled = io_fill_cqe_aux(ctx, req->user_data, mask, - IORING_CQE_F_MORE); - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - if (unlikely(!filled)) - return -ECANCELED; - io_cqring_ev_posted(ctx); - } else if (req->result) { - return 0; - } - - /* force the next iteration to vfs_poll() */ - req->result = 0; - - /* - * Release all references, retry if someone tried to restart - * task_work while we were executing it. - */ - } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs) & - IO_POLL_REF_MASK); - - return 1; -} - -static void io_poll_task_func(struct io_kiocb *req, bool *locked) -{ - struct io_ring_ctx *ctx = req->ctx; - int ret; - - ret = io_poll_check_events(req); - if (ret > 0) - return; - - if (!ret) { - req->result = mangle_poll(req->result & req->poll.events); - } else { - req->result = ret; - req_set_fail(req); - } - - io_poll_remove_entries(req); - spin_lock(&ctx->completion_lock); - hash_del(&req->hash_node); - spin_unlock(&ctx->completion_lock); - io_req_complete_post(req, req->result, 0); -} - -static void io_apoll_task_func(struct io_kiocb *req, bool *locked) -{ - struct io_ring_ctx *ctx = req->ctx; - int ret; - - ret = io_poll_check_events(req); - if (ret > 0) - return; - - io_poll_remove_entries(req); - spin_lock(&ctx->completion_lock); - hash_del(&req->hash_node); - spin_unlock(&ctx->completion_lock); - - if (!ret) - io_req_task_submit(req, locked); - else - io_req_complete_failed(req, ret); -} - -static void __io_poll_execute(struct io_kiocb *req, int mask) -{ - req->result = mask; - if (req->opcode == IORING_OP_POLL_ADD) - req->io_task_work.func = io_poll_task_func; - else - req->io_task_work.func = io_apoll_task_func; - - trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); - io_req_task_work_add(req); -} - -static inline void io_poll_execute(struct io_kiocb *req, int res) -{ - if (io_poll_get_ownership(req)) - __io_poll_execute(req, res); -} - -static void io_poll_cancel_req(struct io_kiocb *req) -{ - io_poll_mark_cancelled(req); - /* kick tw, which should complete the request */ - io_poll_execute(req, 0); -} - -static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, - void *key) -{ - struct io_kiocb *req = wait->private; - struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, - wait); - __poll_t mask = key_to_poll(key); - - if (unlikely(mask & POLLFREE)) { - io_poll_mark_cancelled(req); - /* we have to kick tw in case it's not already */ - io_poll_execute(req, 0); - - /* - * If the waitqueue is being freed early but someone is already - * holds ownership over it, we have to tear down the request as - * best we can. That means immediately removing the request from - * its waitqueue and preventing all further accesses to the - * waitqueue via the request. - */ - list_del_init(&poll->wait.entry); - - /* - * Careful: this *must* be the last step, since as soon - * as req->head is NULL'ed out, the request can be - * completed and freed, since aio_poll_complete_work() - * will no longer need to take the waitqueue lock. - */ - smp_store_release(&poll->head, NULL); - return 1; - } - - /* for instances that support it check for an event match first */ - if (mask && !(mask & poll->events)) - return 0; - - if (io_poll_get_ownership(req)) - __io_poll_execute(req, mask); - return 1; -} - -static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, - struct wait_queue_head *head, - struct io_poll_iocb **poll_ptr) -{ - struct io_kiocb *req = pt->req; - - /* - * The file being polled uses multiple waitqueues for poll handling - * (e.g. one for read, one for write). Setup a separate io_poll_iocb - * if this happens. - */ - if (unlikely(pt->nr_entries)) { - struct io_poll_iocb *first = poll; - - /* double add on the same waitqueue head, ignore */ - if (first->head == head) - return; - /* already have a 2nd entry, fail a third attempt */ - if (*poll_ptr) { - if ((*poll_ptr)->head == head) - return; - pt->error = -EINVAL; - return; - } - - poll = kmalloc(sizeof(*poll), GFP_ATOMIC); - if (!poll) { - pt->error = -ENOMEM; - return; - } - io_init_poll_iocb(poll, first->events, first->wait.func); - *poll_ptr = poll; - } - - pt->nr_entries++; - poll->head = head; - poll->wait.private = req; - - if (poll->events & EPOLLEXCLUSIVE) - add_wait_queue_exclusive(head, &poll->wait); - else - add_wait_queue(head, &poll->wait); -} - -static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, - struct poll_table_struct *p) -{ - struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); - - __io_queue_proc(&pt->req->poll, pt, head, - (struct io_poll_iocb **) &pt->req->async_data); -} - -static int __io_arm_poll_handler(struct io_kiocb *req, - struct io_poll_iocb *poll, - struct io_poll_table *ipt, __poll_t mask) -{ - struct io_ring_ctx *ctx = req->ctx; - - INIT_HLIST_NODE(&req->hash_node); - io_init_poll_iocb(poll, mask, io_poll_wake); - poll->file = req->file; - poll->wait.private = req; - - ipt->pt._key = mask; - ipt->req = req; - ipt->error = 0; - ipt->nr_entries = 0; - - /* - * Take the ownership to delay any tw execution up until we're done - * with poll arming. see io_poll_get_ownership(). - */ - atomic_set(&req->poll_refs, 1); - mask = vfs_poll(req->file, &ipt->pt) & poll->events; - - if (mask && (poll->events & EPOLLONESHOT)) { - io_poll_remove_entries(req); - /* no one else has access to the req, forget about the ref */ - return mask; - } - if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { - io_poll_remove_entries(req); - if (!ipt->error) - ipt->error = -EINVAL; - return 0; - } - - spin_lock(&ctx->completion_lock); - io_poll_req_insert(req); - spin_unlock(&ctx->completion_lock); - - if (mask) { - /* can't multishot if failed, just queue the event we've got */ - if (unlikely(ipt->error || !ipt->nr_entries)) { - poll->events |= EPOLLONESHOT; - ipt->error = 0; - } - __io_poll_execute(req, mask); - return 0; - } - - /* - * Try to release ownership. If we see a change of state, e.g. - * poll was waken up, queue up a tw, it'll deal with it. - */ - if (atomic_cmpxchg(&req->poll_refs, 1, 0) != 1) - __io_poll_execute(req, 0); - return 0; -} - -static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, - struct poll_table_struct *p) -{ - struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); - struct async_poll *apoll = pt->req->apoll; - - __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); -} - -enum { - IO_APOLL_OK, - IO_APOLL_ABORTED, - IO_APOLL_READY -}; - -static int io_arm_poll_handler(struct io_kiocb *req) -{ - const struct io_op_def *def = &io_op_defs[req->opcode]; - struct io_ring_ctx *ctx = req->ctx; - struct async_poll *apoll; - struct io_poll_table ipt; - __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; - int ret; - - if (!req->file || !file_can_poll(req->file)) - return IO_APOLL_ABORTED; - if (req->flags & REQ_F_POLLED) - return IO_APOLL_ABORTED; - if (!def->pollin && !def->pollout) - return IO_APOLL_ABORTED; - - if (def->pollin) { - mask |= POLLIN | POLLRDNORM; - - /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ - if ((req->opcode == IORING_OP_RECVMSG) && - (req->sr_msg.msg_flags & MSG_ERRQUEUE)) - mask &= ~POLLIN; - } else { - mask |= POLLOUT | POLLWRNORM; - } - - apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); - if (unlikely(!apoll)) - return IO_APOLL_ABORTED; - apoll->double_poll = NULL; - req->apoll = apoll; - req->flags |= REQ_F_POLLED; - ipt.pt._qproc = io_async_queue_proc; - - ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); - if (ret || ipt.error) - return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; - - trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, - mask, apoll->poll.events); - return IO_APOLL_OK; -} - -/* - * Returns true if we found and killed one or more poll requests - */ -static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, - bool cancel_all) -{ - struct hlist_node *tmp; - struct io_kiocb *req; - bool found = false; - int i; - - spin_lock(&ctx->completion_lock); - for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { - struct hlist_head *list; - - list = &ctx->cancel_hash[i]; - hlist_for_each_entry_safe(req, tmp, list, hash_node) { - if (io_match_task_safe(req, tsk, cancel_all)) { - hlist_del_init(&req->hash_node); - io_poll_cancel_req(req); - found = true; - } - } - } - spin_unlock(&ctx->completion_lock); - return found; -} - -static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, - bool poll_only) - __must_hold(&ctx->completion_lock) -{ - struct hlist_head *list; - struct io_kiocb *req; - - list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; - hlist_for_each_entry(req, list, hash_node) { - if (sqe_addr != req->user_data) - continue; - if (poll_only && req->opcode != IORING_OP_POLL_ADD) - continue; - return req; - } - return NULL; -} - -static bool io_poll_disarm(struct io_kiocb *req) - __must_hold(&ctx->completion_lock) -{ - if (!io_poll_get_ownership(req)) - return false; - io_poll_remove_entries(req); - hash_del(&req->hash_node); - return true; -} - -static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, - bool poll_only) - __must_hold(&ctx->completion_lock) -{ - struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only); - - if (!req) - return -ENOENT; - io_poll_cancel_req(req); - return 0; -} - -static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, - unsigned int flags) -{ - u32 events; - - events = READ_ONCE(sqe->poll32_events); -#ifdef __BIG_ENDIAN - events = swahw32(events); -#endif - if (!(flags & IORING_POLL_ADD_MULTI)) - events |= EPOLLONESHOT; - return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); -} - -static int io_poll_update_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_poll_update *upd = &req->poll_update; - u32 flags; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) - return -EINVAL; - flags = READ_ONCE(sqe->len); - if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | - IORING_POLL_ADD_MULTI)) - return -EINVAL; - /* meaningless without update */ - if (flags == IORING_POLL_ADD_MULTI) - return -EINVAL; - - upd->old_user_data = READ_ONCE(sqe->addr); - upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; - upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; - - upd->new_user_data = READ_ONCE(sqe->off); - if (!upd->update_user_data && upd->new_user_data) - return -EINVAL; - if (upd->update_events) - upd->events = io_poll_parse_events(sqe, flags); - else if (sqe->poll32_events) - return -EINVAL; - - return 0; -} - -static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - struct io_poll_iocb *poll = &req->poll; - u32 flags; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) - return -EINVAL; - flags = READ_ONCE(sqe->len); - if (flags & ~IORING_POLL_ADD_MULTI) - return -EINVAL; - - io_req_set_refcount(req); - poll->events = io_poll_parse_events(sqe, flags); - return 0; -} - -static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_poll_iocb *poll = &req->poll; - struct io_poll_table ipt; - int ret; - - ipt.pt._qproc = io_poll_queue_proc; - - ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); - if (!ret && ipt.error) - req_set_fail(req); - ret = ret ?: ipt.error; - if (ret) - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_kiocb *preq; - int ret2, ret = 0; - - spin_lock(&ctx->completion_lock); - preq = io_poll_find(ctx, req->poll_update.old_user_data, true); - if (!preq || !io_poll_disarm(preq)) { - spin_unlock(&ctx->completion_lock); - ret = preq ? -EALREADY : -ENOENT; - goto out; - } - spin_unlock(&ctx->completion_lock); - - if (req->poll_update.update_events || req->poll_update.update_user_data) { - /* only mask one event flags, keep behavior flags */ - if (req->poll_update.update_events) { - preq->poll.events &= ~0xffff; - preq->poll.events |= req->poll_update.events & 0xffff; - preq->poll.events |= IO_POLL_UNMASK; - } - if (req->poll_update.update_user_data) - preq->user_data = req->poll_update.new_user_data; - - ret2 = io_poll_add(preq, issue_flags); - /* successfully updated, don't complete poll request */ - if (!ret2) - goto out; - } - req_set_fail(preq); - io_req_complete(preq, -ECANCELED); -out: - if (ret < 0) - req_set_fail(req); - /* complete update request, we're done with it */ - io_req_complete(req, ret); - return 0; -} - -static void io_req_task_timeout(struct io_kiocb *req, bool *locked) -{ - req_set_fail(req); - io_req_complete_post(req, -ETIME, 0); -} - -static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) -{ - struct io_timeout_data *data = container_of(timer, - struct io_timeout_data, timer); - struct io_kiocb *req = data->req; - struct io_ring_ctx *ctx = req->ctx; - unsigned long flags; - - spin_lock_irqsave(&ctx->timeout_lock, flags); - list_del_init(&req->timeout.list); - atomic_set(&req->ctx->cq_timeouts, - atomic_read(&req->ctx->cq_timeouts) + 1); - spin_unlock_irqrestore(&ctx->timeout_lock, flags); - - req->io_task_work.func = io_req_task_timeout; - io_req_task_work_add(req); - return HRTIMER_NORESTART; -} - -static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, - __u64 user_data) - __must_hold(&ctx->timeout_lock) -{ - struct io_timeout_data *io; - struct io_kiocb *req; - bool found = false; - - list_for_each_entry(req, &ctx->timeout_list, timeout.list) { - found = user_data == req->user_data; - if (found) - break; - } - if (!found) - return ERR_PTR(-ENOENT); - - io = req->async_data; - if (hrtimer_try_to_cancel(&io->timer) == -1) - return ERR_PTR(-EALREADY); - list_del_init(&req->timeout.list); - return req; -} - -static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) - __must_hold(&ctx->completion_lock) - __must_hold(&ctx->timeout_lock) -{ - struct io_kiocb *req = io_timeout_extract(ctx, user_data); - - if (IS_ERR(req)) - return PTR_ERR(req); - - req_set_fail(req); - io_fill_cqe_req(req, -ECANCELED, 0); - io_put_req_deferred(req); - return 0; -} - -static clockid_t io_timeout_get_clock(struct io_timeout_data *data) -{ - switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { - case IORING_TIMEOUT_BOOTTIME: - return CLOCK_BOOTTIME; - case IORING_TIMEOUT_REALTIME: - return CLOCK_REALTIME; - default: - /* can't happen, vetted at prep time */ - WARN_ON_ONCE(1); - fallthrough; - case 0: - return CLOCK_MONOTONIC; - } -} - -static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, - struct timespec64 *ts, enum hrtimer_mode mode) - __must_hold(&ctx->timeout_lock) -{ - struct io_timeout_data *io; - struct io_kiocb *req; - bool found = false; - - list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { - found = user_data == req->user_data; - if (found) - break; - } - if (!found) - return -ENOENT; - - io = req->async_data; - if (hrtimer_try_to_cancel(&io->timer) == -1) - return -EALREADY; - hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); - io->timer.function = io_link_timeout_fn; - hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); - return 0; -} - -static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, - struct timespec64 *ts, enum hrtimer_mode mode) - __must_hold(&ctx->timeout_lock) -{ - struct io_kiocb *req = io_timeout_extract(ctx, user_data); - struct io_timeout_data *data; - - if (IS_ERR(req)) - return PTR_ERR(req); - - req->timeout.off = 0; /* noseq */ - data = req->async_data; - list_add_tail(&req->timeout.list, &ctx->timeout_list); - hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); - data->timer.function = io_timeout_fn; - hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); - return 0; -} - -static int io_timeout_remove_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - struct io_timeout_rem *tr = &req->timeout_rem; - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) - return -EINVAL; - - tr->ltimeout = false; - tr->addr = READ_ONCE(sqe->addr); - tr->flags = READ_ONCE(sqe->timeout_flags); - if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { - if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) - return -EINVAL; - if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) - tr->ltimeout = true; - if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) - return -EINVAL; - if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) - return -EFAULT; - } else if (tr->flags) { - /* timeout removal doesn't support flags */ - return -EINVAL; - } - - return 0; -} - -static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) -{ - return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS - : HRTIMER_MODE_REL; -} - -/* - * Remove or update an existing timeout command - */ -static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_timeout_rem *tr = &req->timeout_rem; - struct io_ring_ctx *ctx = req->ctx; - int ret; - - if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { - spin_lock(&ctx->completion_lock); - spin_lock_irq(&ctx->timeout_lock); - ret = io_timeout_cancel(ctx, tr->addr); - spin_unlock_irq(&ctx->timeout_lock); - spin_unlock(&ctx->completion_lock); - } else { - enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); - - spin_lock_irq(&ctx->timeout_lock); - if (tr->ltimeout) - ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); - else - ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); - spin_unlock_irq(&ctx->timeout_lock); - } - - if (ret < 0) - req_set_fail(req); - io_req_complete_post(req, ret, 0); - return 0; -} - -static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, - bool is_timeout_link) -{ - struct io_timeout_data *data; - unsigned flags; - u32 off = READ_ONCE(sqe->off); - - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || - sqe->splice_fd_in) - return -EINVAL; - if (off && is_timeout_link) - return -EINVAL; - flags = READ_ONCE(sqe->timeout_flags); - if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) - return -EINVAL; - /* more than one clock specified is invalid, obviously */ - if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) - return -EINVAL; - - INIT_LIST_HEAD(&req->timeout.list); - req->timeout.off = off; - if (unlikely(off && !req->ctx->off_timeout_used)) - req->ctx->off_timeout_used = true; - - if (!req->async_data && io_alloc_async_data(req)) - return -ENOMEM; - - data = req->async_data; - data->req = req; - data->flags = flags; - - if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) - return -EFAULT; - - INIT_LIST_HEAD(&req->timeout.list); - data->mode = io_translate_timeout_mode(flags); - hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); - - if (is_timeout_link) { - struct io_submit_link *link = &req->ctx->submit_state.link; - - if (!link->head) - return -EINVAL; - if (link->last->opcode == IORING_OP_LINK_TIMEOUT) - return -EINVAL; - req->timeout.head = link->last; - link->last->flags |= REQ_F_ARM_LTIMEOUT; - } - return 0; -} - -static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_timeout_data *data = req->async_data; - struct list_head *entry; - u32 tail, off = req->timeout.off; - - spin_lock_irq(&ctx->timeout_lock); - - /* - * sqe->off holds how many events that need to occur for this - * timeout event to be satisfied. If it isn't set, then this is - * a pure timeout request, sequence isn't used. - */ - if (io_is_timeout_noseq(req)) { - entry = ctx->timeout_list.prev; - goto add; - } - - tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); - req->timeout.target_seq = tail + off; - - /* Update the last seq here in case io_flush_timeouts() hasn't. - * This is safe because ->completion_lock is held, and submissions - * and completions are never mixed in the same ->completion_lock section. - */ - ctx->cq_last_tm_flush = tail; - - /* - * Insertion sort, ensuring the first entry in the list is always - * the one we need first. - */ - list_for_each_prev(entry, &ctx->timeout_list) { - struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, - timeout.list); - - if (io_is_timeout_noseq(nxt)) - continue; - /* nxt.seq is behind @tail, otherwise would've been completed */ - if (off >= nxt->timeout.target_seq - tail) - break; - } -add: - list_add(&req->timeout.list, entry); - data->timer.function = io_timeout_fn; - hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); - spin_unlock_irq(&ctx->timeout_lock); - return 0; -} - -struct io_cancel_data { - struct io_ring_ctx *ctx; - u64 user_data; -}; - -static bool io_cancel_cb(struct io_wq_work *work, void *data) -{ - struct io_kiocb *req = container_of(work, struct io_kiocb, work); - struct io_cancel_data *cd = data; - - return req->ctx == cd->ctx && req->user_data == cd->user_data; -} - -static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, - struct io_ring_ctx *ctx) -{ - struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; - enum io_wq_cancel cancel_ret; - int ret = 0; - - if (!tctx || !tctx->io_wq) - return -ENOENT; - - cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); - switch (cancel_ret) { - case IO_WQ_CANCEL_OK: - ret = 0; - break; - case IO_WQ_CANCEL_RUNNING: - ret = -EALREADY; - break; - case IO_WQ_CANCEL_NOTFOUND: - ret = -ENOENT; - break; - } - - return ret; -} - -static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) -{ - struct io_ring_ctx *ctx = req->ctx; - int ret; - - WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); - - ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); - if (ret != -ENOENT) - return ret; - - spin_lock(&ctx->completion_lock); - spin_lock_irq(&ctx->timeout_lock); - ret = io_timeout_cancel(ctx, sqe_addr); - spin_unlock_irq(&ctx->timeout_lock); - if (ret != -ENOENT) - goto out; - ret = io_poll_cancel(ctx, sqe_addr, false); -out: - spin_unlock(&ctx->completion_lock); - return ret; -} - -static int io_async_cancel_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) - return -EINVAL; - if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) - return -EINVAL; - if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || - sqe->splice_fd_in) - return -EINVAL; - - req->cancel.addr = READ_ONCE(sqe->addr); - return 0; -} - -static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - u64 sqe_addr = req->cancel.addr; - struct io_tctx_node *node; - int ret; - - ret = io_try_cancel_userdata(req, sqe_addr); - if (ret != -ENOENT) - goto done; - - /* slow path, try all io-wq's */ - io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); - ret = -ENOENT; - list_for_each_entry(node, &ctx->tctx_list, ctx_node) { - struct io_uring_task *tctx = node->task->io_uring; - - ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); - if (ret != -ENOENT) - break; - } - io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); -done: - if (ret < 0) - req_set_fail(req); - io_req_complete_post(req, ret, 0); - return 0; -} - -static int io_rsrc_update_prep(struct io_kiocb *req, - const struct io_uring_sqe *sqe) -{ - if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) - return -EINVAL; - if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) - return -EINVAL; - - req->rsrc_update.offset = READ_ONCE(sqe->off); - req->rsrc_update.nr_args = READ_ONCE(sqe->len); - if (!req->rsrc_update.nr_args) - return -EINVAL; - req->rsrc_update.arg = READ_ONCE(sqe->addr); - return 0; -} - -static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - struct io_uring_rsrc_update2 up; - int ret; - - up.offset = req->rsrc_update.offset; - up.data = req->rsrc_update.arg; - up.nr = 0; - up.tags = 0; - up.resv = 0; - up.resv2 = 0; - - io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); - ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, - &up, req->rsrc_update.nr_args); - io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); - - if (ret < 0) - req_set_fail(req); - __io_req_complete(req, issue_flags, ret, 0); - return 0; -} - -static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) -{ - switch (req->opcode) { - case IORING_OP_NOP: - return 0; - case IORING_OP_READV: - case IORING_OP_READ_FIXED: - case IORING_OP_READ: - return io_read_prep(req, sqe); - case IORING_OP_WRITEV: - case IORING_OP_WRITE_FIXED: - case IORING_OP_WRITE: - return io_write_prep(req, sqe); - case IORING_OP_POLL_ADD: - return io_poll_add_prep(req, sqe); - case IORING_OP_POLL_REMOVE: - return io_poll_update_prep(req, sqe); - case IORING_OP_FSYNC: - return io_fsync_prep(req, sqe); - case IORING_OP_SYNC_FILE_RANGE: - return io_sfr_prep(req, sqe); - case IORING_OP_SENDMSG: - case IORING_OP_SEND: - return io_sendmsg_prep(req, sqe); - case IORING_OP_RECVMSG: - case IORING_OP_RECV: - return io_recvmsg_prep(req, sqe); - case IORING_OP_CONNECT: - return io_connect_prep(req, sqe); - case IORING_OP_TIMEOUT: - return io_timeout_prep(req, sqe, false); - case IORING_OP_TIMEOUT_REMOVE: - return io_timeout_remove_prep(req, sqe); - case IORING_OP_ASYNC_CANCEL: - return io_async_cancel_prep(req, sqe); - case IORING_OP_LINK_TIMEOUT: - return io_timeout_prep(req, sqe, true); - case IORING_OP_ACCEPT: - return io_accept_prep(req, sqe); - case IORING_OP_FALLOCATE: - return io_fallocate_prep(req, sqe); - case IORING_OP_OPENAT: - return io_openat_prep(req, sqe); - case IORING_OP_CLOSE: - return io_close_prep(req, sqe); - case IORING_OP_FILES_UPDATE: - return io_rsrc_update_prep(req, sqe); - case IORING_OP_STATX: - return io_statx_prep(req, sqe); - case IORING_OP_FADVISE: - return io_fadvise_prep(req, sqe); - case IORING_OP_MADVISE: - return io_madvise_prep(req, sqe); - case IORING_OP_OPENAT2: - return io_openat2_prep(req, sqe); - case IORING_OP_EPOLL_CTL: - return io_epoll_ctl_prep(req, sqe); - case IORING_OP_SPLICE: - return io_splice_prep(req, sqe); - case IORING_OP_PROVIDE_BUFFERS: - return io_provide_buffers_prep(req, sqe); - case IORING_OP_REMOVE_BUFFERS: - return io_remove_buffers_prep(req, sqe); - case IORING_OP_TEE: - return io_tee_prep(req, sqe); - case IORING_OP_SHUTDOWN: - return io_shutdown_prep(req, sqe); - case IORING_OP_RENAMEAT: - return io_renameat_prep(req, sqe); - case IORING_OP_UNLINKAT: - return io_unlinkat_prep(req, sqe); - case IORING_OP_MKDIRAT: - return io_mkdirat_prep(req, sqe); - case IORING_OP_SYMLINKAT: - return io_symlinkat_prep(req, sqe); - case IORING_OP_LINKAT: - return io_linkat_prep(req, sqe); - } - - printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", - req->opcode); - return -EINVAL; -} - -static int io_req_prep_async(struct io_kiocb *req) -{ - if (!io_op_defs[req->opcode].needs_async_setup) - return 0; - if (WARN_ON_ONCE(req->async_data)) - return -EFAULT; - if (io_alloc_async_data(req)) - return -EAGAIN; - - switch (req->opcode) { - case IORING_OP_READV: - return io_rw_prep_async(req, READ); - case IORING_OP_WRITEV: - return io_rw_prep_async(req, WRITE); - case IORING_OP_SENDMSG: - return io_sendmsg_prep_async(req); - case IORING_OP_RECVMSG: - return io_recvmsg_prep_async(req); - case IORING_OP_CONNECT: - return io_connect_prep_async(req); - } - printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", - req->opcode); - return -EFAULT; -} - -static u32 io_get_sequence(struct io_kiocb *req) -{ - u32 seq = req->ctx->cached_sq_head; - - /* need original cached_sq_head, but it was increased for each req */ - io_for_each_link(req, req) - seq--; - return seq; -} - -static bool io_drain_req(struct io_kiocb *req) -{ - struct io_kiocb *pos; - struct io_ring_ctx *ctx = req->ctx; - struct io_defer_entry *de; - int ret; - u32 seq; - - if (req->flags & REQ_F_FAIL) { - io_req_complete_fail_submit(req); - return true; - } - - /* - * If we need to drain a request in the middle of a link, drain the - * head request and the next request/link after the current link. - * Considering sequential execution of links, IOSQE_IO_DRAIN will be - * maintained for every request of our link. - */ - if (ctx->drain_next) { - req->flags |= REQ_F_IO_DRAIN; - ctx->drain_next = false; - } - /* not interested in head, start from the first linked */ - io_for_each_link(pos, req->link) { - if (pos->flags & REQ_F_IO_DRAIN) { - ctx->drain_next = true; - req->flags |= REQ_F_IO_DRAIN; - break; - } - } - - /* Still need defer if there is pending req in defer list. */ - spin_lock(&ctx->completion_lock); - if (likely(list_empty_careful(&ctx->defer_list) && - !(req->flags & REQ_F_IO_DRAIN))) { - spin_unlock(&ctx->completion_lock); - ctx->drain_active = false; - return false; - } - spin_unlock(&ctx->completion_lock); - - seq = io_get_sequence(req); - /* Still a chance to pass the sequence check */ - if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) - return false; - - ret = io_req_prep_async(req); - if (ret) - goto fail; - io_prep_async_link(req); - de = kmalloc(sizeof(*de), GFP_KERNEL); - if (!de) { - ret = -ENOMEM; -fail: - io_req_complete_failed(req, ret); - return true; - } - - spin_lock(&ctx->completion_lock); - if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { - spin_unlock(&ctx->completion_lock); - kfree(de); - io_queue_async_work(req, NULL); - return true; - } - - trace_io_uring_defer(ctx, req, req->user_data); - de->req = req; - de->seq = seq; - list_add_tail(&de->list, &ctx->defer_list); - spin_unlock(&ctx->completion_lock); - return true; -} - -static void io_clean_op(struct io_kiocb *req) -{ - if (req->flags & REQ_F_BUFFER_SELECTED) { - switch (req->opcode) { - case IORING_OP_READV: - case IORING_OP_READ_FIXED: - case IORING_OP_READ: - kfree((void *)(unsigned long)req->rw.addr); - break; - case IORING_OP_RECVMSG: - case IORING_OP_RECV: - kfree(req->sr_msg.kbuf); - break; - } - } - - if (req->flags & REQ_F_NEED_CLEANUP) { - switch (req->opcode) { - case IORING_OP_READV: - case IORING_OP_READ_FIXED: - case IORING_OP_READ: - case IORING_OP_WRITEV: - case IORING_OP_WRITE_FIXED: - case IORING_OP_WRITE: { - struct io_async_rw *io = req->async_data; - - kfree(io->free_iovec); - break; - } - case IORING_OP_RECVMSG: - case IORING_OP_SENDMSG: { - struct io_async_msghdr *io = req->async_data; - - kfree(io->free_iov); - break; - } - case IORING_OP_OPENAT: - case IORING_OP_OPENAT2: - if (req->open.filename) - putname(req->open.filename); - break; - case IORING_OP_RENAMEAT: - putname(req->rename.oldpath); - putname(req->rename.newpath); - break; - case IORING_OP_UNLINKAT: - putname(req->unlink.filename); - break; - case IORING_OP_MKDIRAT: - putname(req->mkdir.filename); - break; - case IORING_OP_SYMLINKAT: - putname(req->symlink.oldpath); - putname(req->symlink.newpath); - break; - case IORING_OP_LINKAT: - putname(req->hardlink.oldpath); - putname(req->hardlink.newpath); - break; - } - } - if ((req->flags & REQ_F_POLLED) && req->apoll) { - kfree(req->apoll->double_poll); - kfree(req->apoll); - req->apoll = NULL; - } - if (req->flags & REQ_F_INFLIGHT) { - struct io_uring_task *tctx = req->task->io_uring; - - atomic_dec(&tctx->inflight_tracked); - } - if (req->flags & REQ_F_CREDS) - put_cred(req->creds); - - req->flags &= ~IO_REQ_CLEAN_FLAGS; -} - -static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) -{ - struct io_ring_ctx *ctx = req->ctx; - const struct cred *creds = NULL; - int ret; - - if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) - creds = override_creds(req->creds); - - switch (req->opcode) { - case IORING_OP_NOP: - ret = io_nop(req, issue_flags); - break; - case IORING_OP_READV: - case IORING_OP_READ_FIXED: - case IORING_OP_READ: - ret = io_read(req, issue_flags); - break; - case IORING_OP_WRITEV: - case IORING_OP_WRITE_FIXED: - case IORING_OP_WRITE: - ret = io_write(req, issue_flags); - break; - case IORING_OP_FSYNC: - ret = io_fsync(req, issue_flags); - break; - case IORING_OP_POLL_ADD: - ret = io_poll_add(req, issue_flags); - break; - case IORING_OP_POLL_REMOVE: - ret = io_poll_update(req, issue_flags); - break; - case IORING_OP_SYNC_FILE_RANGE: - ret = io_sync_file_range(req, issue_flags); - break; - case IORING_OP_SENDMSG: - ret = io_sendmsg(req, issue_flags); - break; - case IORING_OP_SEND: - ret = io_send(req, issue_flags); - break; - case IORING_OP_RECVMSG: - ret = io_recvmsg(req, issue_flags); - break; - case IORING_OP_RECV: - ret = io_recv(req, issue_flags); - break; - case IORING_OP_TIMEOUT: - ret = io_timeout(req, issue_flags); - break; - case IORING_OP_TIMEOUT_REMOVE: - ret = io_timeout_remove(req, issue_flags); - break; - case IORING_OP_ACCEPT: - ret = io_accept(req, issue_flags); - break; - case IORING_OP_CONNECT: - ret = io_connect(req, issue_flags); - break; - case IORING_OP_ASYNC_CANCEL: - ret = io_async_cancel(req, issue_flags); - break; - case IORING_OP_FALLOCATE: - ret = io_fallocate(req, issue_flags); - break; - case IORING_OP_OPENAT: - ret = io_openat(req, issue_flags); - break; - case IORING_OP_CLOSE: - ret = io_close(req, issue_flags); - break; - case IORING_OP_FILES_UPDATE: - ret = io_files_update(req, issue_flags); - break; - case IORING_OP_STATX: - ret = io_statx(req, issue_flags); - break; - case IORING_OP_FADVISE: - ret = io_fadvise(req, issue_flags); - break; - case IORING_OP_MADVISE: - ret = io_madvise(req, issue_flags); - break; - case IORING_OP_OPENAT2: - ret = io_openat2(req, issue_flags); - break; - case IORING_OP_EPOLL_CTL: - ret = io_epoll_ctl(req, issue_flags); - break; - case IORING_OP_SPLICE: - ret = io_splice(req, issue_flags); - break; - case IORING_OP_PROVIDE_BUFFERS: - ret = io_provide_buffers(req, issue_flags); - break; - case IORING_OP_REMOVE_BUFFERS: - ret = io_remove_buffers(req, issue_flags); - break; - case IORING_OP_TEE: - ret = io_tee(req, issue_flags); - break; - case IORING_OP_SHUTDOWN: - ret = io_shutdown(req, issue_flags); - break; - case IORING_OP_RENAMEAT: - ret = io_renameat(req, issue_flags); - break; - case IORING_OP_UNLINKAT: - ret = io_unlinkat(req, issue_flags); - break; - case IORING_OP_MKDIRAT: - ret = io_mkdirat(req, issue_flags); - break; - case IORING_OP_SYMLINKAT: - ret = io_symlinkat(req, issue_flags); - break; - case IORING_OP_LINKAT: - ret = io_linkat(req, issue_flags); - break; - default: - ret = -EINVAL; - break; - } - - if (creds) - revert_creds(creds); - if (ret) - return ret; - /* If the op doesn't have a file, we're not polling for it */ - if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) - io_iopoll_req_issued(req); - - return 0; -} - -static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) -{ - struct io_kiocb *req = container_of(work, struct io_kiocb, work); - - req = io_put_req_find_next(req); - return req ? &req->work : NULL; -} - -static void io_wq_submit_work(struct io_wq_work *work) -{ - struct io_kiocb *req = container_of(work, struct io_kiocb, work); - struct io_kiocb *timeout; - int ret = 0; - - /* one will be dropped by ->io_free_work() after returning to io-wq */ - if (!(req->flags & REQ_F_REFCOUNT)) - __io_req_set_refcount(req, 2); - else - req_ref_get(req); - - timeout = io_prep_linked_timeout(req); - if (timeout) - io_queue_linked_timeout(timeout); - - /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ - if (work->flags & IO_WQ_WORK_CANCEL) - ret = -ECANCELED; - - if (!ret) { - do { - ret = io_issue_sqe(req, 0); - /* - * We can get EAGAIN for polled IO even though we're - * forcing a sync submission from here, since we can't - * wait for request slots on the block side. - */ - if (ret != -EAGAIN || !(req->ctx->flags & IORING_SETUP_IOPOLL)) - break; - cond_resched(); - } while (1); - } - - /* avoid locking problems by failing it from a clean context */ - if (ret) - io_req_task_queue_fail(req, ret); -} - -static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, - unsigned i) -{ - return &table->files[i]; -} - -static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, - int index) -{ - struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); - - return (struct file *) (slot->file_ptr & FFS_MASK); -} - -static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) -{ - unsigned long file_ptr = (unsigned long) file; - - if (__io_file_supports_nowait(file, READ)) - file_ptr |= FFS_ASYNC_READ; - if (__io_file_supports_nowait(file, WRITE)) - file_ptr |= FFS_ASYNC_WRITE; - if (S_ISREG(file_inode(file)->i_mode)) - file_ptr |= FFS_ISREG; - file_slot->file_ptr = file_ptr; -} - -static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, - struct io_kiocb *req, int fd) -{ - struct file *file; - unsigned long file_ptr; - - if (unlikely((unsigned int)fd >= ctx->nr_user_files)) - return NULL; - fd = array_index_nospec(fd, ctx->nr_user_files); - file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; - file = (struct file *) (file_ptr & FFS_MASK); - file_ptr &= ~FFS_MASK; - /* mask in overlapping REQ_F and FFS bits */ - req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); - io_req_set_rsrc_node(req); - return file; -} - -static struct file *io_file_get_normal(struct io_ring_ctx *ctx, - struct io_kiocb *req, int fd) -{ - struct file *file = fget(fd); - - trace_io_uring_file_get(ctx, fd); - - /* we don't allow fixed io_uring files */ - if (file && unlikely(file->f_op == &io_uring_fops)) - io_req_track_inflight(req); - return file; -} - -static inline struct file *io_file_get(struct io_ring_ctx *ctx, - struct io_kiocb *req, int fd, bool fixed) -{ - if (fixed) - return io_file_get_fixed(ctx, req, fd); - else - return io_file_get_normal(ctx, req, fd); -} - -static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) -{ - struct io_kiocb *prev = req->timeout.prev; - int ret = -ENOENT; - - if (prev) { - if (!(req->task->flags & PF_EXITING)) - ret = io_try_cancel_userdata(req, prev->user_data); - io_req_complete_post(req, ret ?: -ETIME, 0); - io_put_req(prev); - } else { - io_req_complete_post(req, -ETIME, 0); - } -} - -static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) -{ - struct io_timeout_data *data = container_of(timer, - struct io_timeout_data, timer); - struct io_kiocb *prev, *req = data->req; - struct io_ring_ctx *ctx = req->ctx; - unsigned long flags; - - spin_lock_irqsave(&ctx->timeout_lock, flags); - prev = req->timeout.head; - req->timeout.head = NULL; - - /* - * We don't expect the list to be empty, that will only happen if we - * race with the completion of the linked work. - */ - if (prev) { - io_remove_next_linked(prev); - if (!req_ref_inc_not_zero(prev)) - prev = NULL; - } - list_del(&req->timeout.list); - req->timeout.prev = prev; - spin_unlock_irqrestore(&ctx->timeout_lock, flags); - - req->io_task_work.func = io_req_task_link_timeout; - io_req_task_work_add(req); - return HRTIMER_NORESTART; -} - -static void io_queue_linked_timeout(struct io_kiocb *req) -{ - struct io_ring_ctx *ctx = req->ctx; - - spin_lock_irq(&ctx->timeout_lock); - /* - * If the back reference is NULL, then our linked request finished - * before we got a chance to setup the timer - */ - if (req->timeout.head) { - struct io_timeout_data *data = req->async_data; - - data->timer.function = io_link_timeout_fn; - hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), - data->mode); - list_add_tail(&req->timeout.list, &ctx->ltimeout_list); - } - spin_unlock_irq(&ctx->timeout_lock); - /* drop submission reference */ - io_put_req(req); -} - -static void __io_queue_sqe(struct io_kiocb *req) - __must_hold(&req->ctx->uring_lock) -{ - struct io_kiocb *linked_timeout; - int ret; - -issue_sqe: - ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); - - /* - * We async punt it if the file wasn't marked NOWAIT, or if the file - * doesn't support non-blocking read/write attempts - */ - if (likely(!ret)) { - if (req->flags & REQ_F_COMPLETE_INLINE) { - struct io_ring_ctx *ctx = req->ctx; - struct io_submit_state *state = &ctx->submit_state; - - state->compl_reqs[state->compl_nr++] = req; - if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) - io_submit_flush_completions(ctx); - return; - } - - linked_timeout = io_prep_linked_timeout(req); - if (linked_timeout) - io_queue_linked_timeout(linked_timeout); - } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { - linked_timeout = io_prep_linked_timeout(req); - - switch (io_arm_poll_handler(req)) { - case IO_APOLL_READY: - if (linked_timeout) - io_queue_linked_timeout(linked_timeout); - goto issue_sqe; - case IO_APOLL_ABORTED: - /* - * Queued up for async execution, worker will release - * submit reference when the iocb is actually submitted. - */ - io_queue_async_work(req, NULL); - break; - } - - if (linked_timeout) - io_queue_linked_timeout(linked_timeout); - } else { - io_req_complete_failed(req, ret); - } -} - -static inline void io_queue_sqe(struct io_kiocb *req) - __must_hold(&req->ctx->uring_lock) -{ - if (unlikely(req->ctx->drain_active) && io_drain_req(req)) - return; - - if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { - __io_queue_sqe(req); - } else if (req->flags & REQ_F_FAIL) { - io_req_complete_fail_submit(req); - } else { - int ret = io_req_prep_async(req); - - if (unlikely(ret)) - io_req_complete_failed(req, ret); - else - io_queue_async_work(req, NULL); - } -} - -/* - * Check SQE restrictions (opcode and flags). - * - * Returns 'true' if SQE is allowed, 'false' otherwise. - */ -static inline bool io_check_restriction(struct io_ring_ctx *ctx, - struct io_kiocb *req, - unsigned int sqe_flags) -{ - if (likely(!ctx->restricted)) - return true; - - if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) - return false; - - if ((sqe_flags & ctx->restrictions.sqe_flags_required) != - ctx->restrictions.sqe_flags_required) - return false; - - if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | - ctx->restrictions.sqe_flags_required)) - return false; - - return true; -} - -static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, - const struct io_uring_sqe *sqe) - __must_hold(&ctx->uring_lock) -{ - struct io_submit_state *state; - unsigned int sqe_flags; - int personality, ret = 0; - - /* req is partially pre-initialised, see io_preinit_req() */ - req->opcode = READ_ONCE(sqe->opcode); - /* same numerical values with corresponding REQ_F_*, safe to copy */ - req->flags = sqe_flags = READ_ONCE(sqe->flags); - req->user_data = READ_ONCE(sqe->user_data); - req->file = NULL; - req->fixed_rsrc_refs = NULL; - req->task = current; - - /* enforce forwards compatibility on users */ - if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) - return -EINVAL; - if (unlikely(req->opcode >= IORING_OP_LAST)) - return -EINVAL; - if (!io_check_restriction(ctx, req, sqe_flags)) - return -EACCES; - - if ((sqe_flags & IOSQE_BUFFER_SELECT) && - !io_op_defs[req->opcode].buffer_select) - return -EOPNOTSUPP; - if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) - ctx->drain_active = true; - - personality = READ_ONCE(sqe->personality); - if (personality) { - req->creds = xa_load(&ctx->personalities, personality); - if (!req->creds) - return -EINVAL; - get_cred(req->creds); - req->flags |= REQ_F_CREDS; - } - state = &ctx->submit_state; - - /* - * Plug now if we have more than 1 IO left after this, and the target - * is potentially a read/write to block based storage. - */ - if (!state->plug_started && state->ios_left > 1 && - io_op_defs[req->opcode].plug) { - blk_start_plug(&state->plug); - state->plug_started = true; - } - - if (io_op_defs[req->opcode].needs_file) { - req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), - (sqe_flags & IOSQE_FIXED_FILE)); - if (unlikely(!req->file)) - ret = -EBADF; - } - - state->ios_left--; - return ret; -} - -static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, - const struct io_uring_sqe *sqe) - __must_hold(&ctx->uring_lock) -{ - struct io_submit_link *link = &ctx->submit_state.link; - int ret; - - ret = io_init_req(ctx, req, sqe); - if (unlikely(ret)) { -fail_req: - /* fail even hard links since we don't submit */ - if (link->head) { - /* - * we can judge a link req is failed or cancelled by if - * REQ_F_FAIL is set, but the head is an exception since - * it may be set REQ_F_FAIL because of other req's failure - * so let's leverage req->result to distinguish if a head - * is set REQ_F_FAIL because of its failure or other req's - * failure so that we can set the correct ret code for it. - * init result here to avoid affecting the normal path. - */ - if (!(link->head->flags & REQ_F_FAIL)) - req_fail_link_node(link->head, -ECANCELED); - } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { - /* - * the current req is a normal req, we should return - * error and thus break the submittion loop. - */ - io_req_complete_failed(req, ret); - return ret; - } - req_fail_link_node(req, ret); - } else { - ret = io_req_prep(req, sqe); - if (unlikely(ret)) - goto fail_req; - } - - /* don't need @sqe from now on */ - trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, - req->flags, true, - ctx->flags & IORING_SETUP_SQPOLL); - - /* - * If we already have a head request, queue this one for async - * submittal once the head completes. If we don't have a head but - * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be - * submitted sync once the chain is complete. If none of those - * conditions are true (normal request), then just queue it. - */ - if (link->head) { - struct io_kiocb *head = link->head; - - if (!(req->flags & REQ_F_FAIL)) { - ret = io_req_prep_async(req); - if (unlikely(ret)) { - req_fail_link_node(req, ret); - if (!(head->flags & REQ_F_FAIL)) - req_fail_link_node(head, -ECANCELED); - } - } - trace_io_uring_link(ctx, req, head); - link->last->link = req; - link->last = req; - - /* last request of a link, enqueue the link */ - if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { - link->head = NULL; - io_queue_sqe(head); - } - } else { - if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { - link->head = req; - link->last = req; - } else { - io_queue_sqe(req); - } - } - - return 0; -} - -/* - * Batched submission is done, ensure local IO is flushed out. - */ -static void io_submit_state_end(struct io_submit_state *state, - struct io_ring_ctx *ctx) -{ - if (state->link.head) - io_queue_sqe(state->link.head); - if (state->compl_nr) - io_submit_flush_completions(ctx); - if (state->plug_started) - blk_finish_plug(&state->plug); -} - -/* - * Start submission side cache. - */ -static void io_submit_state_start(struct io_submit_state *state, - unsigned int max_ios) -{ - state->plug_started = false; - state->ios_left = max_ios; - /* set only head, no need to init link_last in advance */ - state->link.head = NULL; -} - -static void io_commit_sqring(struct io_ring_ctx *ctx) -{ - struct io_rings *rings = ctx->rings; - - /* - * Ensure any loads from the SQEs are done at this point, - * since once we write the new head, the application could - * write new data to them. - */ - smp_store_release(&rings->sq.head, ctx->cached_sq_head); -} - -/* - * Fetch an sqe, if one is available. Note this returns a pointer to memory - * that is mapped by userspace. This means that care needs to be taken to - * ensure that reads are stable, as we cannot rely on userspace always - * being a good citizen. If members of the sqe are validated and then later - * used, it's important that those reads are done through READ_ONCE() to - * prevent a re-load down the line. - */ -static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) -{ - unsigned head, mask = ctx->sq_entries - 1; - unsigned sq_idx = ctx->cached_sq_head++ & mask; - - /* - * The cached sq head (or cq tail) serves two purposes: - * - * 1) allows us to batch the cost of updating the user visible - * head updates. - * 2) allows the kernel side to track the head on its own, even - * though the application is the one updating it. - */ - head = READ_ONCE(ctx->sq_array[sq_idx]); - if (likely(head < ctx->sq_entries)) - return &ctx->sq_sqes[head]; - - /* drop invalid entries */ - ctx->cq_extra--; - WRITE_ONCE(ctx->rings->sq_dropped, - READ_ONCE(ctx->rings->sq_dropped) + 1); - return NULL; -} - -static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) - __must_hold(&ctx->uring_lock) -{ - int submitted = 0; - - /* make sure SQ entry isn't read before tail */ - nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); - if (!percpu_ref_tryget_many(&ctx->refs, nr)) - return -EAGAIN; - io_get_task_refs(nr); - - io_submit_state_start(&ctx->submit_state, nr); - while (submitted < nr) { - const struct io_uring_sqe *sqe; - struct io_kiocb *req; - - req = io_alloc_req(ctx); - if (unlikely(!req)) { - if (!submitted) - submitted = -EAGAIN; - break; - } - sqe = io_get_sqe(ctx); - if (unlikely(!sqe)) { - list_add(&req->inflight_entry, &ctx->submit_state.free_list); - break; - } - /* will complete beyond this point, count as submitted */ - submitted++; - if (io_submit_sqe(ctx, req, sqe)) - break; - } - - if (unlikely(submitted != nr)) { - int ref_used = (submitted == -EAGAIN) ? 0 : submitted; - int unused = nr - ref_used; - - current->io_uring->cached_refs += unused; - percpu_ref_put_many(&ctx->refs, unused); - } - - io_submit_state_end(&ctx->submit_state, ctx); - /* Commit SQ ring head once we've consumed and submitted all SQEs */ - io_commit_sqring(ctx); - - return submitted; -} - -static inline bool io_sqd_events_pending(struct io_sq_data *sqd) -{ - return READ_ONCE(sqd->state); -} - -static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) -{ - /* Tell userspace we may need a wakeup call */ - spin_lock(&ctx->completion_lock); - WRITE_ONCE(ctx->rings->sq_flags, - ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); - spin_unlock(&ctx->completion_lock); -} - -static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) -{ - spin_lock(&ctx->completion_lock); - WRITE_ONCE(ctx->rings->sq_flags, - ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); - spin_unlock(&ctx->completion_lock); -} - -static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) -{ - unsigned int to_submit; - int ret = 0; - - to_submit = io_sqring_entries(ctx); - /* if we're handling multiple rings, cap submit size for fairness */ - if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) - to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; - - if (!list_empty(&ctx->iopoll_list) || to_submit) { - unsigned nr_events = 0; - const struct cred *creds = NULL; - - if (ctx->sq_creds != current_cred()) - creds = override_creds(ctx->sq_creds); - - mutex_lock(&ctx->uring_lock); - if (!list_empty(&ctx->iopoll_list)) - io_do_iopoll(ctx, &nr_events, 0); - - /* - * Don't submit if refs are dying, good for io_uring_register(), - * but also it is relied upon by io_ring_exit_work() - */ - if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && - !(ctx->flags & IORING_SETUP_R_DISABLED)) - ret = io_submit_sqes(ctx, to_submit); - mutex_unlock(&ctx->uring_lock); - - if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) - wake_up(&ctx->sqo_sq_wait); - if (creds) - revert_creds(creds); - } - - return ret; -} - -static void io_sqd_update_thread_idle(struct io_sq_data *sqd) -{ - struct io_ring_ctx *ctx; - unsigned sq_thread_idle = 0; - - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) - sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); - sqd->sq_thread_idle = sq_thread_idle; -} - -static bool io_sqd_handle_event(struct io_sq_data *sqd) -{ - bool did_sig = false; - struct ksignal ksig; - - if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || - signal_pending(current)) { - mutex_unlock(&sqd->lock); - if (signal_pending(current)) - did_sig = get_signal(&ksig); - cond_resched(); - mutex_lock(&sqd->lock); - } - return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); -} - -static int io_sq_thread(void *data) -{ - struct io_sq_data *sqd = data; - struct io_ring_ctx *ctx; - unsigned long timeout = 0; - char buf[TASK_COMM_LEN]; - DEFINE_WAIT(wait); - - snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); - set_task_comm(current, buf); - - if (sqd->sq_cpu != -1) - set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); - else - set_cpus_allowed_ptr(current, cpu_online_mask); - current->flags |= PF_NO_SETAFFINITY; - - mutex_lock(&sqd->lock); - while (1) { - bool cap_entries, sqt_spin = false; - - if (io_sqd_events_pending(sqd) || signal_pending(current)) { - if (io_sqd_handle_event(sqd)) - break; - timeout = jiffies + sqd->sq_thread_idle; - } - - cap_entries = !list_is_singular(&sqd->ctx_list); - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { - int ret = __io_sq_thread(ctx, cap_entries); - - if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) - sqt_spin = true; - } - if (io_run_task_work()) - sqt_spin = true; - - if (sqt_spin || !time_after(jiffies, timeout)) { - cond_resched(); - if (sqt_spin) - timeout = jiffies + sqd->sq_thread_idle; - continue; - } - - prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); - if (!io_sqd_events_pending(sqd) && !current->task_works) { - bool needs_sched = true; - - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { - io_ring_set_wakeup_flag(ctx); - - if ((ctx->flags & IORING_SETUP_IOPOLL) && - !list_empty_careful(&ctx->iopoll_list)) { - needs_sched = false; - break; - } - if (io_sqring_entries(ctx)) { - needs_sched = false; - break; - } - } - - if (needs_sched) { - mutex_unlock(&sqd->lock); - schedule(); - mutex_lock(&sqd->lock); - } - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) - io_ring_clear_wakeup_flag(ctx); - } - - finish_wait(&sqd->wait, &wait); - timeout = jiffies + sqd->sq_thread_idle; - } - - io_uring_cancel_generic(true, sqd); - sqd->thread = NULL; - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) - io_ring_set_wakeup_flag(ctx); - io_run_task_work(); - mutex_unlock(&sqd->lock); - - complete(&sqd->exited); - do_exit(0); -} - -struct io_wait_queue { - struct wait_queue_entry wq; - struct io_ring_ctx *ctx; - unsigned cq_tail; - unsigned nr_timeouts; -}; - -static inline bool io_should_wake(struct io_wait_queue *iowq) -{ - struct io_ring_ctx *ctx = iowq->ctx; - int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; - - /* - * Wake up if we have enough events, or if a timeout occurred since we - * started waiting. For timeouts, we always want to return to userspace, - * regardless of event count. - */ - return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; -} - -static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, - int wake_flags, void *key) -{ - struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, - wq); - - /* - * Cannot safely flush overflowed CQEs from here, ensure we wake up - * the task, and the next invocation will do it. - */ - if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) - return autoremove_wake_function(curr, mode, wake_flags, key); - return -1; -} - -static int io_run_task_work_sig(void) -{ - if (io_run_task_work()) - return 1; - if (!signal_pending(current)) - return 0; - if (test_thread_flag(TIF_NOTIFY_SIGNAL)) - return -ERESTARTSYS; - return -EINTR; -} - -/* when returns >0, the caller should retry */ -static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, - struct io_wait_queue *iowq, - ktime_t timeout) -{ - int ret; - - /* make sure we run task_work before checking for signals */ - ret = io_run_task_work_sig(); - if (ret || io_should_wake(iowq)) - return ret; - /* let the caller flush overflows, retry */ - if (test_bit(0, &ctx->check_cq_overflow)) - return 1; - - if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) - return -ETIME; - return 1; -} - -/* - * Wait until events become available, if we don't already have some. The - * application must reap them itself, as they reside on the shared cq ring. - */ -static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, - const sigset_t __user *sig, size_t sigsz, - struct __kernel_timespec __user *uts) -{ - struct io_wait_queue iowq; - struct io_rings *rings = ctx->rings; - ktime_t timeout = KTIME_MAX; - int ret; - - do { - io_cqring_overflow_flush(ctx); - if (io_cqring_events(ctx) >= min_events) - return 0; - if (!io_run_task_work()) - break; - } while (1); - - if (uts) { - struct timespec64 ts; - - if (get_timespec64(&ts, uts)) - return -EFAULT; - timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); - } - - if (sig) { -#ifdef CONFIG_COMPAT - if (in_compat_syscall()) - ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, - sigsz); - else -#endif - ret = set_user_sigmask(sig, sigsz); - - if (ret) - return ret; - } - - init_waitqueue_func_entry(&iowq.wq, io_wake_function); - iowq.wq.private = current; - INIT_LIST_HEAD(&iowq.wq.entry); - iowq.ctx = ctx; - iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); - iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; - - trace_io_uring_cqring_wait(ctx, min_events); - do { - /* if we can't even flush overflow, don't wait for more */ - if (!io_cqring_overflow_flush(ctx)) { - ret = -EBUSY; - break; - } - prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, - TASK_INTERRUPTIBLE); - ret = io_cqring_wait_schedule(ctx, &iowq, timeout); - finish_wait(&ctx->cq_wait, &iowq.wq); - cond_resched(); - } while (ret > 0); - - restore_saved_sigmask_unless(ret == -EINTR); - - return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; -} - -static void io_free_page_table(void **table, size_t size) -{ - unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); - - for (i = 0; i < nr_tables; i++) - kfree(table[i]); - kfree(table); -} - -static void **io_alloc_page_table(size_t size) -{ - unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); - size_t init_size = size; - void **table; - - table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); - if (!table) - return NULL; - - for (i = 0; i < nr_tables; i++) { - unsigned int this_size = min_t(size_t, size, PAGE_SIZE); - - table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); - if (!table[i]) { - io_free_page_table(table, init_size); - return NULL; - } - size -= this_size; - } - return table; -} - -static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) -{ - percpu_ref_exit(&ref_node->refs); - kfree(ref_node); -} - -static void io_rsrc_node_ref_zero(struct percpu_ref *ref) -{ - struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); - struct io_ring_ctx *ctx = node->rsrc_data->ctx; - unsigned long flags; - bool first_add = false; - unsigned long delay = HZ; - - spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); - node->done = true; - - /* if we are mid-quiesce then do not delay */ - if (node->rsrc_data->quiesce) - delay = 0; - - while (!list_empty(&ctx->rsrc_ref_list)) { - node = list_first_entry(&ctx->rsrc_ref_list, - struct io_rsrc_node, node); - /* recycle ref nodes in order */ - if (!node->done) - break; - list_del(&node->node); - first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); - } - spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); - - if (first_add) - mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); -} - -static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) -{ - struct io_rsrc_node *ref_node; - - ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); - if (!ref_node) - return NULL; - - if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, - 0, GFP_KERNEL)) { - kfree(ref_node); - return NULL; - } - INIT_LIST_HEAD(&ref_node->node); - INIT_LIST_HEAD(&ref_node->rsrc_list); - ref_node->done = false; - return ref_node; -} - -static void io_rsrc_node_switch(struct io_ring_ctx *ctx, - struct io_rsrc_data *data_to_kill) -{ - WARN_ON_ONCE(!ctx->rsrc_backup_node); - WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); - - if (data_to_kill) { - struct io_rsrc_node *rsrc_node = ctx->rsrc_node; - - rsrc_node->rsrc_data = data_to_kill; - spin_lock_irq(&ctx->rsrc_ref_lock); - list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); - spin_unlock_irq(&ctx->rsrc_ref_lock); - - atomic_inc(&data_to_kill->refs); - percpu_ref_kill(&rsrc_node->refs); - ctx->rsrc_node = NULL; - } - - if (!ctx->rsrc_node) { - ctx->rsrc_node = ctx->rsrc_backup_node; - ctx->rsrc_backup_node = NULL; - } -} - -static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) -{ - if (ctx->rsrc_backup_node) - return 0; - ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); - return ctx->rsrc_backup_node ? 0 : -ENOMEM; -} - -static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) -{ - int ret; - - /* As we may drop ->uring_lock, other task may have started quiesce */ - if (data->quiesce) - return -ENXIO; - - data->quiesce = true; - do { - ret = io_rsrc_node_switch_start(ctx); - if (ret) - break; - io_rsrc_node_switch(ctx, data); - - /* kill initial ref, already quiesced if zero */ - if (atomic_dec_and_test(&data->refs)) - break; - mutex_unlock(&ctx->uring_lock); - flush_delayed_work(&ctx->rsrc_put_work); - ret = wait_for_completion_interruptible(&data->done); - if (!ret) { - mutex_lock(&ctx->uring_lock); - if (atomic_read(&data->refs) > 0) { - /* - * it has been revived by another thread while - * we were unlocked - */ - mutex_unlock(&ctx->uring_lock); - } else { - break; - } - } - - atomic_inc(&data->refs); - /* wait for all works potentially completing data->done */ - flush_delayed_work(&ctx->rsrc_put_work); - reinit_completion(&data->done); - - ret = io_run_task_work_sig(); - mutex_lock(&ctx->uring_lock); - } while (ret >= 0); - data->quiesce = false; - - return ret; -} - -static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) -{ - unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; - unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; - - return &data->tags[table_idx][off]; -} - -static void io_rsrc_data_free(struct io_rsrc_data *data) -{ - size_t size = data->nr * sizeof(data->tags[0][0]); - - if (data->tags) - io_free_page_table((void **)data->tags, size); - kfree(data); -} - -static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, - u64 __user *utags, unsigned nr, - struct io_rsrc_data **pdata) -{ - struct io_rsrc_data *data; - int ret = -ENOMEM; - unsigned i; - - data = kzalloc(sizeof(*data), GFP_KERNEL); - if (!data) - return -ENOMEM; - data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); - if (!data->tags) { - kfree(data); - return -ENOMEM; - } - - data->nr = nr; - data->ctx = ctx; - data->do_put = do_put; - if (utags) { - ret = -EFAULT; - for (i = 0; i < nr; i++) { - u64 *tag_slot = io_get_tag_slot(data, i); - - if (copy_from_user(tag_slot, &utags[i], - sizeof(*tag_slot))) - goto fail; - } - } - - atomic_set(&data->refs, 1); - init_completion(&data->done); - *pdata = data; - return 0; -fail: - io_rsrc_data_free(data); - return ret; -} - -static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) -{ - table->files = kvcalloc(nr_files, sizeof(table->files[0]), - GFP_KERNEL_ACCOUNT); - return !!table->files; -} - -static void io_free_file_tables(struct io_file_table *table) -{ - kvfree(table->files); - table->files = NULL; -} - -static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) -{ -#if defined(CONFIG_UNIX) - if (ctx->ring_sock) { - struct sock *sock = ctx->ring_sock->sk; - struct sk_buff *skb; - - while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) - kfree_skb(skb); - } -#else - int i; - - for (i = 0; i < ctx->nr_user_files; i++) { - struct file *file; - - file = io_file_from_index(ctx, i); - if (file) - fput(file); - } -#endif - io_free_file_tables(&ctx->file_table); - io_rsrc_data_free(ctx->file_data); - ctx->file_data = NULL; - ctx->nr_user_files = 0; -} - -static int io_sqe_files_unregister(struct io_ring_ctx *ctx) -{ - unsigned nr = ctx->nr_user_files; - int ret; - - if (!ctx->file_data) - return -ENXIO; - - /* - * Quiesce may unlock ->uring_lock, and while it's not held - * prevent new requests using the table. - */ - ctx->nr_user_files = 0; - ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); - ctx->nr_user_files = nr; - if (!ret) - __io_sqe_files_unregister(ctx); - return ret; -} - -static void io_sq_thread_unpark(struct io_sq_data *sqd) - __releases(&sqd->lock) -{ - WARN_ON_ONCE(sqd->thread == current); - - /* - * Do the dance but not conditional clear_bit() because it'd race with - * other threads incrementing park_pending and setting the bit. - */ - clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); - if (atomic_dec_return(&sqd->park_pending)) - set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); - mutex_unlock(&sqd->lock); -} - -static void io_sq_thread_park(struct io_sq_data *sqd) - __acquires(&sqd->lock) -{ - WARN_ON_ONCE(sqd->thread == current); - - atomic_inc(&sqd->park_pending); - set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); - mutex_lock(&sqd->lock); - if (sqd->thread) - wake_up_process(sqd->thread); -} - -static void io_sq_thread_stop(struct io_sq_data *sqd) -{ - WARN_ON_ONCE(sqd->thread == current); - WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); - - set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); - mutex_lock(&sqd->lock); - if (sqd->thread) - wake_up_process(sqd->thread); - mutex_unlock(&sqd->lock); - wait_for_completion(&sqd->exited); -} - -static void io_put_sq_data(struct io_sq_data *sqd) -{ - if (refcount_dec_and_test(&sqd->refs)) { - WARN_ON_ONCE(atomic_read(&sqd->park_pending)); - - io_sq_thread_stop(sqd); - kfree(sqd); - } -} - -static void io_sq_thread_finish(struct io_ring_ctx *ctx) -{ - struct io_sq_data *sqd = ctx->sq_data; - - if (sqd) { - io_sq_thread_park(sqd); - list_del_init(&ctx->sqd_list); - io_sqd_update_thread_idle(sqd); - io_sq_thread_unpark(sqd); - - io_put_sq_data(sqd); - ctx->sq_data = NULL; - } -} - -static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) -{ - struct io_ring_ctx *ctx_attach; - struct io_sq_data *sqd; - struct fd f; - - f = fdget(p->wq_fd); - if (!f.file) - return ERR_PTR(-ENXIO); - if (f.file->f_op != &io_uring_fops) { - fdput(f); - return ERR_PTR(-EINVAL); - } - - ctx_attach = f.file->private_data; - sqd = ctx_attach->sq_data; - if (!sqd) { - fdput(f); - return ERR_PTR(-EINVAL); - } - if (sqd->task_tgid != current->tgid) { - fdput(f); - return ERR_PTR(-EPERM); - } - - refcount_inc(&sqd->refs); - fdput(f); - return sqd; -} - -static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, - bool *attached) -{ - struct io_sq_data *sqd; - - *attached = false; - if (p->flags & IORING_SETUP_ATTACH_WQ) { - sqd = io_attach_sq_data(p); - if (!IS_ERR(sqd)) { - *attached = true; - return sqd; - } - /* fall through for EPERM case, setup new sqd/task */ - if (PTR_ERR(sqd) != -EPERM) - return sqd; - } - - sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); - if (!sqd) - return ERR_PTR(-ENOMEM); - - atomic_set(&sqd->park_pending, 0); - refcount_set(&sqd->refs, 1); - INIT_LIST_HEAD(&sqd->ctx_list); - mutex_init(&sqd->lock); - init_waitqueue_head(&sqd->wait); - init_completion(&sqd->exited); - return sqd; -} - -#if defined(CONFIG_UNIX) -/* - * Ensure the UNIX gc is aware of our file set, so we are certain that - * the io_uring can be safely unregistered on process exit, even if we have - * loops in the file referencing. - */ -static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) -{ - struct sock *sk = ctx->ring_sock->sk; - struct scm_fp_list *fpl; - struct sk_buff *skb; - int i, nr_files; - - fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); - if (!fpl) - return -ENOMEM; - - skb = alloc_skb(0, GFP_KERNEL); - if (!skb) { - kfree(fpl); - return -ENOMEM; - } - - skb->sk = sk; - skb->scm_io_uring = 1; - - nr_files = 0; - fpl->user = get_uid(current_user()); - for (i = 0; i < nr; i++) { - struct file *file = io_file_from_index(ctx, i + offset); - - if (!file) - continue; - fpl->fp[nr_files] = get_file(file); - unix_inflight(fpl->user, fpl->fp[nr_files]); - nr_files++; - } - - if (nr_files) { - fpl->max = SCM_MAX_FD; - fpl->count = nr_files; - UNIXCB(skb).fp = fpl; - skb->destructor = unix_destruct_scm; - refcount_add(skb->truesize, &sk->sk_wmem_alloc); - skb_queue_head(&sk->sk_receive_queue, skb); - - for (i = 0; i < nr; i++) { - struct file *file = io_file_from_index(ctx, i + offset); - - if (file) - fput(file); - } - } else { - kfree_skb(skb); - free_uid(fpl->user); - kfree(fpl); - } - - return 0; -} - -/* - * If UNIX sockets are enabled, fd passing can cause a reference cycle which - * causes regular reference counting to break down. We rely on the UNIX - * garbage collection to take care of this problem for us. - */ -static int io_sqe_files_scm(struct io_ring_ctx *ctx) -{ - unsigned left, total; - int ret = 0; - - total = 0; - left = ctx->nr_user_files; - while (left) { - unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); - - ret = __io_sqe_files_scm(ctx, this_files, total); - if (ret) - break; - left -= this_files; - total += this_files; - } - - if (!ret) - return 0; - - while (total < ctx->nr_user_files) { - struct file *file = io_file_from_index(ctx, total); - - if (file) - fput(file); - total++; - } - - return ret; -} -#else -static int io_sqe_files_scm(struct io_ring_ctx *ctx) -{ - return 0; -} -#endif - -static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) -{ - struct file *file = prsrc->file; -#if defined(CONFIG_UNIX) - struct sock *sock = ctx->ring_sock->sk; - struct sk_buff_head list, *head = &sock->sk_receive_queue; - struct sk_buff *skb; - int i; - - __skb_queue_head_init(&list); - - /* - * Find the skb that holds this file in its SCM_RIGHTS. When found, - * remove this entry and rearrange the file array. - */ - skb = skb_dequeue(head); - while (skb) { - struct scm_fp_list *fp; - - fp = UNIXCB(skb).fp; - for (i = 0; i < fp->count; i++) { - int left; - - if (fp->fp[i] != file) - continue; - - unix_notinflight(fp->user, fp->fp[i]); - left = fp->count - 1 - i; - if (left) { - memmove(&fp->fp[i], &fp->fp[i + 1], - left * sizeof(struct file *)); - } - fp->count--; - if (!fp->count) { - kfree_skb(skb); - skb = NULL; - } else { - __skb_queue_tail(&list, skb); - } - fput(file); - file = NULL; - break; - } - - if (!file) - break; - - __skb_queue_tail(&list, skb); - - skb = skb_dequeue(head); - } - - if (skb_peek(&list)) { - spin_lock_irq(&head->lock); - while ((skb = __skb_dequeue(&list)) != NULL) - __skb_queue_tail(head, skb); - spin_unlock_irq(&head->lock); - } -#else - fput(file); -#endif -} - -static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) -{ - struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; - struct io_ring_ctx *ctx = rsrc_data->ctx; - struct io_rsrc_put *prsrc, *tmp; - - list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { - list_del(&prsrc->list); - - if (prsrc->tag) { - bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; - - io_ring_submit_lock(ctx, lock_ring); - spin_lock(&ctx->completion_lock); - io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - io_cqring_ev_posted(ctx); - io_ring_submit_unlock(ctx, lock_ring); - } - - rsrc_data->do_put(ctx, prsrc); - kfree(prsrc); - } - - io_rsrc_node_destroy(ref_node); - if (atomic_dec_and_test(&rsrc_data->refs)) - complete(&rsrc_data->done); -} - -static void io_rsrc_put_work(struct work_struct *work) -{ - struct io_ring_ctx *ctx; - struct llist_node *node; - - ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); - node = llist_del_all(&ctx->rsrc_put_llist); - - while (node) { - struct io_rsrc_node *ref_node; - struct llist_node *next = node->next; - - ref_node = llist_entry(node, struct io_rsrc_node, llist); - __io_rsrc_put_work(ref_node); - node = next; - } -} - -static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, - unsigned nr_args, u64 __user *tags) -{ - __s32 __user *fds = (__s32 __user *) arg; - struct file *file; - int fd, ret; - unsigned i; - - if (ctx->file_data) - return -EBUSY; - if (!nr_args) - return -EINVAL; - if (nr_args > IORING_MAX_FIXED_FILES) - return -EMFILE; - if (nr_args > rlimit(RLIMIT_NOFILE)) - return -EMFILE; - ret = io_rsrc_node_switch_start(ctx); - if (ret) - return ret; - ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, - &ctx->file_data); - if (ret) - return ret; - - ret = -ENOMEM; - if (!io_alloc_file_tables(&ctx->file_table, nr_args)) - goto out_free; - - for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { - if (copy_from_user(&fd, &fds[i], sizeof(fd))) { - ret = -EFAULT; - goto out_fput; - } - /* allow sparse sets */ - if (fd == -1) { - ret = -EINVAL; - if (unlikely(*io_get_tag_slot(ctx->file_data, i))) - goto out_fput; - continue; - } - - file = fget(fd); - ret = -EBADF; - if (unlikely(!file)) - goto out_fput; - - /* - * Don't allow io_uring instances to be registered. If UNIX - * isn't enabled, then this causes a reference cycle and this - * instance can never get freed. If UNIX is enabled we'll - * handle it just fine, but there's still no point in allowing - * a ring fd as it doesn't support regular read/write anyway. - */ - if (file->f_op == &io_uring_fops) { - fput(file); - goto out_fput; - } - io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); - } - - ret = io_sqe_files_scm(ctx); - if (ret) { - __io_sqe_files_unregister(ctx); - return ret; - } - - io_rsrc_node_switch(ctx, NULL); - return ret; -out_fput: - for (i = 0; i < ctx->nr_user_files; i++) { - file = io_file_from_index(ctx, i); - if (file) - fput(file); - } - io_free_file_tables(&ctx->file_table); - ctx->nr_user_files = 0; -out_free: - io_rsrc_data_free(ctx->file_data); - ctx->file_data = NULL; - return ret; -} - -static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, - int index) -{ -#if defined(CONFIG_UNIX) - struct sock *sock = ctx->ring_sock->sk; - struct sk_buff_head *head = &sock->sk_receive_queue; - struct sk_buff *skb; - - /* - * See if we can merge this file into an existing skb SCM_RIGHTS - * file set. If there's no room, fall back to allocating a new skb - * and filling it in. - */ - spin_lock_irq(&head->lock); - skb = skb_peek(head); - if (skb) { - struct scm_fp_list *fpl = UNIXCB(skb).fp; - - if (fpl->count < SCM_MAX_FD) { - __skb_unlink(skb, head); - spin_unlock_irq(&head->lock); - fpl->fp[fpl->count] = get_file(file); - unix_inflight(fpl->user, fpl->fp[fpl->count]); - fpl->count++; - spin_lock_irq(&head->lock); - __skb_queue_head(head, skb); - } else { - skb = NULL; - } - } - spin_unlock_irq(&head->lock); - - if (skb) { - fput(file); - return 0; - } - - return __io_sqe_files_scm(ctx, 1, index); -#else - return 0; -#endif -} - -static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, - struct io_rsrc_node *node, void *rsrc) -{ - u64 *tag_slot = io_get_tag_slot(data, idx); - struct io_rsrc_put *prsrc; - - prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); - if (!prsrc) - return -ENOMEM; - - prsrc->tag = *tag_slot; - *tag_slot = 0; - prsrc->rsrc = rsrc; - list_add(&prsrc->list, &node->rsrc_list); - return 0; -} - -static int io_install_fixed_file(struct io_kiocb *req, struct file *file, - unsigned int issue_flags, u32 slot_index) -{ - struct io_ring_ctx *ctx = req->ctx; - bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - bool needs_switch = false; - struct io_fixed_file *file_slot; - int ret = -EBADF; - - io_ring_submit_lock(ctx, !force_nonblock); - if (file->f_op == &io_uring_fops) - goto err; - ret = -ENXIO; - if (!ctx->file_data) - goto err; - ret = -EINVAL; - if (slot_index >= ctx->nr_user_files) - goto err; - - slot_index = array_index_nospec(slot_index, ctx->nr_user_files); - file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); - - if (file_slot->file_ptr) { - struct file *old_file; - - ret = io_rsrc_node_switch_start(ctx); - if (ret) - goto err; - - old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); - ret = io_queue_rsrc_removal(ctx->file_data, slot_index, - ctx->rsrc_node, old_file); - if (ret) - goto err; - file_slot->file_ptr = 0; - needs_switch = true; - } - - *io_get_tag_slot(ctx->file_data, slot_index) = 0; - io_fixed_file_set(file_slot, file); - ret = io_sqe_file_register(ctx, file, slot_index); - if (ret) { - file_slot->file_ptr = 0; - goto err; - } - - ret = 0; -err: - if (needs_switch) - io_rsrc_node_switch(ctx, ctx->file_data); - io_ring_submit_unlock(ctx, !force_nonblock); - if (ret) - fput(file); - return ret; -} - -static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) -{ - unsigned int offset = req->close.file_slot - 1; - struct io_ring_ctx *ctx = req->ctx; - struct io_fixed_file *file_slot; - struct file *file; - int ret; - - io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); - ret = -ENXIO; - if (unlikely(!ctx->file_data)) - goto out; - ret = -EINVAL; - if (offset >= ctx->nr_user_files) - goto out; - ret = io_rsrc_node_switch_start(ctx); - if (ret) - goto out; - - offset = array_index_nospec(offset, ctx->nr_user_files); - file_slot = io_fixed_file_slot(&ctx->file_table, offset); - ret = -EBADF; - if (!file_slot->file_ptr) - goto out; - - file = (struct file *)(file_slot->file_ptr & FFS_MASK); - ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); - if (ret) - goto out; - - file_slot->file_ptr = 0; - io_rsrc_node_switch(ctx, ctx->file_data); - ret = 0; -out: - io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); - return ret; -} - -static int __io_sqe_files_update(struct io_ring_ctx *ctx, - struct io_uring_rsrc_update2 *up, - unsigned nr_args) -{ - u64 __user *tags = u64_to_user_ptr(up->tags); - __s32 __user *fds = u64_to_user_ptr(up->data); - struct io_rsrc_data *data = ctx->file_data; - struct io_fixed_file *file_slot; - struct file *file; - int fd, i, err = 0; - unsigned int done; - bool needs_switch = false; - - if (!ctx->file_data) - return -ENXIO; - if (up->offset + nr_args > ctx->nr_user_files) - return -EINVAL; - - for (done = 0; done < nr_args; done++) { - u64 tag = 0; - - if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || - copy_from_user(&fd, &fds[done], sizeof(fd))) { - err = -EFAULT; - break; - } - if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { - err = -EINVAL; - break; - } - if (fd == IORING_REGISTER_FILES_SKIP) - continue; - - i = array_index_nospec(up->offset + done, ctx->nr_user_files); - file_slot = io_fixed_file_slot(&ctx->file_table, i); - - if (file_slot->file_ptr) { - file = (struct file *)(file_slot->file_ptr & FFS_MASK); - err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); - if (err) - break; - file_slot->file_ptr = 0; - needs_switch = true; - } - if (fd != -1) { - file = fget(fd); - if (!file) { - err = -EBADF; - break; - } - /* - * Don't allow io_uring instances to be registered. If - * UNIX isn't enabled, then this causes a reference - * cycle and this instance can never get freed. If UNIX - * is enabled we'll handle it just fine, but there's - * still no point in allowing a ring fd as it doesn't - * support regular read/write anyway. - */ - if (file->f_op == &io_uring_fops) { - fput(file); - err = -EBADF; - break; - } - *io_get_tag_slot(data, i) = tag; - io_fixed_file_set(file_slot, file); - err = io_sqe_file_register(ctx, file, i); - if (err) { - file_slot->file_ptr = 0; - fput(file); - break; - } - } - } - - if (needs_switch) - io_rsrc_node_switch(ctx, data); - return done ? done : err; -} - -static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, - struct task_struct *task) -{ - struct io_wq_hash *hash; - struct io_wq_data data; - unsigned int concurrency; - - mutex_lock(&ctx->uring_lock); - hash = ctx->hash_map; - if (!hash) { - hash = kzalloc(sizeof(*hash), GFP_KERNEL); - if (!hash) { - mutex_unlock(&ctx->uring_lock); - return ERR_PTR(-ENOMEM); - } - refcount_set(&hash->refs, 1); - init_waitqueue_head(&hash->wait); - ctx->hash_map = hash; - } - mutex_unlock(&ctx->uring_lock); - - data.hash = hash; - data.task = task; - data.free_work = io_wq_free_work; - data.do_work = io_wq_submit_work; - - /* Do QD, or 4 * CPUS, whatever is smallest */ - concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); - - return io_wq_create(concurrency, &data); -} - -static int io_uring_alloc_task_context(struct task_struct *task, - struct io_ring_ctx *ctx) -{ - struct io_uring_task *tctx; - int ret; - - tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); - if (unlikely(!tctx)) - return -ENOMEM; - - ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); - if (unlikely(ret)) { - kfree(tctx); - return ret; - } - - tctx->io_wq = io_init_wq_offload(ctx, task); - if (IS_ERR(tctx->io_wq)) { - ret = PTR_ERR(tctx->io_wq); - percpu_counter_destroy(&tctx->inflight); - kfree(tctx); - return ret; - } - - xa_init(&tctx->xa); - init_waitqueue_head(&tctx->wait); - atomic_set(&tctx->in_idle, 0); - atomic_set(&tctx->inflight_tracked, 0); - task->io_uring = tctx; - spin_lock_init(&tctx->task_lock); - INIT_WQ_LIST(&tctx->task_list); - init_task_work(&tctx->task_work, tctx_task_work); - return 0; -} - -void __io_uring_free(struct task_struct *tsk) -{ - struct io_uring_task *tctx = tsk->io_uring; - - WARN_ON_ONCE(!xa_empty(&tctx->xa)); - WARN_ON_ONCE(tctx->io_wq); - WARN_ON_ONCE(tctx->cached_refs); - - percpu_counter_destroy(&tctx->inflight); - kfree(tctx); - tsk->io_uring = NULL; -} - -static int io_sq_offload_create(struct io_ring_ctx *ctx, - struct io_uring_params *p) -{ - int ret; - - /* Retain compatibility with failing for an invalid attach attempt */ - if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == - IORING_SETUP_ATTACH_WQ) { - struct fd f; - - f = fdget(p->wq_fd); - if (!f.file) - return -ENXIO; - if (f.file->f_op != &io_uring_fops) { - fdput(f); - return -EINVAL; - } - fdput(f); - } - if (ctx->flags & IORING_SETUP_SQPOLL) { - struct task_struct *tsk; - struct io_sq_data *sqd; - bool attached; - - sqd = io_get_sq_data(p, &attached); - if (IS_ERR(sqd)) { - ret = PTR_ERR(sqd); - goto err; - } - - ctx->sq_creds = get_current_cred(); - ctx->sq_data = sqd; - ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); - if (!ctx->sq_thread_idle) - ctx->sq_thread_idle = HZ; - - io_sq_thread_park(sqd); - list_add(&ctx->sqd_list, &sqd->ctx_list); - io_sqd_update_thread_idle(sqd); - /* don't attach to a dying SQPOLL thread, would be racy */ - ret = (attached && !sqd->thread) ? -ENXIO : 0; - io_sq_thread_unpark(sqd); - - if (ret < 0) - goto err; - if (attached) - return 0; - - if (p->flags & IORING_SETUP_SQ_AFF) { - int cpu = p->sq_thread_cpu; - - ret = -EINVAL; - if (cpu >= nr_cpu_ids || !cpu_online(cpu)) - goto err_sqpoll; - sqd->sq_cpu = cpu; - } else { - sqd->sq_cpu = -1; - } - - sqd->task_pid = current->pid; - sqd->task_tgid = current->tgid; - tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); - if (IS_ERR(tsk)) { - ret = PTR_ERR(tsk); - goto err_sqpoll; - } - - sqd->thread = tsk; - ret = io_uring_alloc_task_context(tsk, ctx); - wake_up_new_task(tsk); - if (ret) - goto err; - } else if (p->flags & IORING_SETUP_SQ_AFF) { - /* Can't have SQ_AFF without SQPOLL */ - ret = -EINVAL; - goto err; - } - - return 0; -err_sqpoll: - complete(&ctx->sq_data->exited); -err: - io_sq_thread_finish(ctx); - return ret; -} - -static inline void __io_unaccount_mem(struct user_struct *user, - unsigned long nr_pages) -{ - atomic_long_sub(nr_pages, &user->locked_vm); -} - -static inline int __io_account_mem(struct user_struct *user, - unsigned long nr_pages) -{ - unsigned long page_limit, cur_pages, new_pages; - - /* Don't allow more pages than we can safely lock */ - page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - - do { - cur_pages = atomic_long_read(&user->locked_vm); - new_pages = cur_pages + nr_pages; - if (new_pages > page_limit) - return -ENOMEM; - } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, - new_pages) != cur_pages); - - return 0; -} - -static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) -{ - if (ctx->user) - __io_unaccount_mem(ctx->user, nr_pages); - - if (ctx->mm_account) - atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); -} - -static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) -{ - int ret; - - if (ctx->user) { - ret = __io_account_mem(ctx->user, nr_pages); - if (ret) - return ret; - } - - if (ctx->mm_account) - atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); - - return 0; -} - -static void io_mem_free(void *ptr) -{ - struct page *page; - - if (!ptr) - return; - - page = virt_to_head_page(ptr); - if (put_page_testzero(page)) - free_compound_page(page); -} - -static void *io_mem_alloc(size_t size) -{ - gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; - - return (void *) __get_free_pages(gfp, get_order(size)); -} - -static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, - size_t *sq_offset) -{ - struct io_rings *rings; - size_t off, sq_array_size; - - off = struct_size(rings, cqes, cq_entries); - if (off == SIZE_MAX) - return SIZE_MAX; - -#ifdef CONFIG_SMP - off = ALIGN(off, SMP_CACHE_BYTES); - if (off == 0) - return SIZE_MAX; -#endif - - if (sq_offset) - *sq_offset = off; - - sq_array_size = array_size(sizeof(u32), sq_entries); - if (sq_array_size == SIZE_MAX) - return SIZE_MAX; - - if (check_add_overflow(off, sq_array_size, &off)) - return SIZE_MAX; - - return off; -} - -static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) -{ - struct io_mapped_ubuf *imu = *slot; - unsigned int i; - - if (imu != ctx->dummy_ubuf) { - for (i = 0; i < imu->nr_bvecs; i++) - unpin_user_page(imu->bvec[i].bv_page); - if (imu->acct_pages) - io_unaccount_mem(ctx, imu->acct_pages); - kvfree(imu); - } - *slot = NULL; -} - -static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) -{ - io_buffer_unmap(ctx, &prsrc->buf); - prsrc->buf = NULL; -} - -static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) -{ - unsigned int i; - - for (i = 0; i < ctx->nr_user_bufs; i++) - io_buffer_unmap(ctx, &ctx->user_bufs[i]); - kfree(ctx->user_bufs); - io_rsrc_data_free(ctx->buf_data); - ctx->user_bufs = NULL; - ctx->buf_data = NULL; - ctx->nr_user_bufs = 0; -} - -static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) -{ - unsigned nr = ctx->nr_user_bufs; - int ret; - - if (!ctx->buf_data) - return -ENXIO; - - /* - * Quiesce may unlock ->uring_lock, and while it's not held - * prevent new requests using the table. - */ - ctx->nr_user_bufs = 0; - ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); - ctx->nr_user_bufs = nr; - if (!ret) - __io_sqe_buffers_unregister(ctx); - return ret; -} - -static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, - void __user *arg, unsigned index) -{ - struct iovec __user *src; - -#ifdef CONFIG_COMPAT - if (ctx->compat) { - struct compat_iovec __user *ciovs; - struct compat_iovec ciov; - - ciovs = (struct compat_iovec __user *) arg; - if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) - return -EFAULT; - - dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); - dst->iov_len = ciov.iov_len; - return 0; - } -#endif - src = (struct iovec __user *) arg; - if (copy_from_user(dst, &src[index], sizeof(*dst))) - return -EFAULT; - return 0; -} - -/* - * Not super efficient, but this is just a registration time. And we do cache - * the last compound head, so generally we'll only do a full search if we don't - * match that one. - * - * We check if the given compound head page has already been accounted, to - * avoid double accounting it. This allows us to account the full size of the - * page, not just the constituent pages of a huge page. - */ -static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, - int nr_pages, struct page *hpage) -{ - int i, j; - - /* check current page array */ - for (i = 0; i < nr_pages; i++) { - if (!PageCompound(pages[i])) - continue; - if (compound_head(pages[i]) == hpage) - return true; - } - - /* check previously registered pages */ - for (i = 0; i < ctx->nr_user_bufs; i++) { - struct io_mapped_ubuf *imu = ctx->user_bufs[i]; - - for (j = 0; j < imu->nr_bvecs; j++) { - if (!PageCompound(imu->bvec[j].bv_page)) - continue; - if (compound_head(imu->bvec[j].bv_page) == hpage) - return true; - } - } - - return false; -} - -static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, - int nr_pages, struct io_mapped_ubuf *imu, - struct page **last_hpage) -{ - int i, ret; - - imu->acct_pages = 0; - for (i = 0; i < nr_pages; i++) { - if (!PageCompound(pages[i])) { - imu->acct_pages++; - } else { - struct page *hpage; - - hpage = compound_head(pages[i]); - if (hpage == *last_hpage) - continue; - *last_hpage = hpage; - if (headpage_already_acct(ctx, pages, i, hpage)) - continue; - imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; - } - } - - if (!imu->acct_pages) - return 0; - - ret = io_account_mem(ctx, imu->acct_pages); - if (ret) - imu->acct_pages = 0; - return ret; -} - -static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, - struct io_mapped_ubuf **pimu, - struct page **last_hpage) -{ - struct io_mapped_ubuf *imu = NULL; - struct vm_area_struct **vmas = NULL; - struct page **pages = NULL; - unsigned long off, start, end, ubuf; - size_t size; - int ret, pret, nr_pages, i; - - if (!iov->iov_base) { - *pimu = ctx->dummy_ubuf; - return 0; - } - - ubuf = (unsigned long) iov->iov_base; - end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; - start = ubuf >> PAGE_SHIFT; - nr_pages = end - start; - - *pimu = NULL; - ret = -ENOMEM; - - pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); - if (!pages) - goto done; - - vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), - GFP_KERNEL); - if (!vmas) - goto done; - - imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); - if (!imu) - goto done; - - ret = 0; - mmap_read_lock(current->mm); - pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, - pages, vmas); - if (pret == nr_pages) { - /* don't support file backed memory */ - for (i = 0; i < nr_pages; i++) { - struct vm_area_struct *vma = vmas[i]; - - if (vma_is_shmem(vma)) - continue; - if (vma->vm_file && - !is_file_hugepages(vma->vm_file)) { - ret = -EOPNOTSUPP; - break; - } - } - } else { - ret = pret < 0 ? pret : -EFAULT; - } - mmap_read_unlock(current->mm); - if (ret) { - /* - * if we did partial map, or found file backed vmas, - * release any pages we did get - */ - if (pret > 0) - unpin_user_pages(pages, pret); - goto done; - } - - ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); - if (ret) { - unpin_user_pages(pages, pret); - goto done; - } - - off = ubuf & ~PAGE_MASK; - size = iov->iov_len; - for (i = 0; i < nr_pages; i++) { - size_t vec_len; - - vec_len = min_t(size_t, size, PAGE_SIZE - off); - imu->bvec[i].bv_page = pages[i]; - imu->bvec[i].bv_len = vec_len; - imu->bvec[i].bv_offset = off; - off = 0; - size -= vec_len; - } - /* store original address for later verification */ - imu->ubuf = ubuf; - imu->ubuf_end = ubuf + iov->iov_len; - imu->nr_bvecs = nr_pages; - *pimu = imu; - ret = 0; -done: - if (ret) - kvfree(imu); - kvfree(pages); - kvfree(vmas); - return ret; -} - -static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) -{ - ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); - return ctx->user_bufs ? 0 : -ENOMEM; -} - -static int io_buffer_validate(struct iovec *iov) -{ - unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); - - /* - * Don't impose further limits on the size and buffer - * constraints here, we'll -EINVAL later when IO is - * submitted if they are wrong. - */ - if (!iov->iov_base) - return iov->iov_len ? -EFAULT : 0; - if (!iov->iov_len) - return -EFAULT; - - /* arbitrary limit, but we need something */ - if (iov->iov_len > SZ_1G) - return -EFAULT; - - if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) - return -EOVERFLOW; - - return 0; -} - -static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, - unsigned int nr_args, u64 __user *tags) -{ - struct page *last_hpage = NULL; - struct io_rsrc_data *data; - int i, ret; - struct iovec iov; - - if (ctx->user_bufs) - return -EBUSY; - if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) - return -EINVAL; - ret = io_rsrc_node_switch_start(ctx); - if (ret) - return ret; - ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); - if (ret) - return ret; - ret = io_buffers_map_alloc(ctx, nr_args); - if (ret) { - io_rsrc_data_free(data); - return ret; - } - - for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { - ret = io_copy_iov(ctx, &iov, arg, i); - if (ret) - break; - ret = io_buffer_validate(&iov); - if (ret) - break; - if (!iov.iov_base && *io_get_tag_slot(data, i)) { - ret = -EINVAL; - break; - } - - ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], - &last_hpage); - if (ret) - break; - } - - WARN_ON_ONCE(ctx->buf_data); - - ctx->buf_data = data; - if (ret) - __io_sqe_buffers_unregister(ctx); - else - io_rsrc_node_switch(ctx, NULL); - return ret; -} - -static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, - struct io_uring_rsrc_update2 *up, - unsigned int nr_args) -{ - u64 __user *tags = u64_to_user_ptr(up->tags); - struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); - struct page *last_hpage = NULL; - bool needs_switch = false; - __u32 done; - int i, err; - - if (!ctx->buf_data) - return -ENXIO; - if (up->offset + nr_args > ctx->nr_user_bufs) - return -EINVAL; - - for (done = 0; done < nr_args; done++) { - struct io_mapped_ubuf *imu; - int offset = up->offset + done; - u64 tag = 0; - - err = io_copy_iov(ctx, &iov, iovs, done); - if (err) - break; - if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { - err = -EFAULT; - break; - } - err = io_buffer_validate(&iov); - if (err) - break; - if (!iov.iov_base && tag) { - err = -EINVAL; - break; - } - err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); - if (err) - break; - - i = array_index_nospec(offset, ctx->nr_user_bufs); - if (ctx->user_bufs[i] != ctx->dummy_ubuf) { - err = io_queue_rsrc_removal(ctx->buf_data, i, - ctx->rsrc_node, ctx->user_bufs[i]); - if (unlikely(err)) { - io_buffer_unmap(ctx, &imu); - break; - } - ctx->user_bufs[i] = NULL; - needs_switch = true; - } - - ctx->user_bufs[i] = imu; - *io_get_tag_slot(ctx->buf_data, offset) = tag; - } - - if (needs_switch) - io_rsrc_node_switch(ctx, ctx->buf_data); - return done ? done : err; -} - -static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) -{ - __s32 __user *fds = arg; - int fd; - - if (ctx->cq_ev_fd) - return -EBUSY; - - if (copy_from_user(&fd, fds, sizeof(*fds))) - return -EFAULT; - - ctx->cq_ev_fd = eventfd_ctx_fdget(fd); - if (IS_ERR(ctx->cq_ev_fd)) { - int ret = PTR_ERR(ctx->cq_ev_fd); - - ctx->cq_ev_fd = NULL; - return ret; - } - - return 0; -} - -static int io_eventfd_unregister(struct io_ring_ctx *ctx) -{ - if (ctx->cq_ev_fd) { - eventfd_ctx_put(ctx->cq_ev_fd); - ctx->cq_ev_fd = NULL; - return 0; - } - - return -ENXIO; -} - -static void io_destroy_buffers(struct io_ring_ctx *ctx) -{ - struct io_buffer *buf; - unsigned long index; - - xa_for_each(&ctx->io_buffers, index, buf) - __io_remove_buffers(ctx, buf, index, -1U); -} - -static void io_req_cache_free(struct list_head *list) -{ - struct io_kiocb *req, *nxt; - - list_for_each_entry_safe(req, nxt, list, inflight_entry) { - list_del(&req->inflight_entry); - kmem_cache_free(req_cachep, req); - } -} - -static void io_req_caches_free(struct io_ring_ctx *ctx) -{ - struct io_submit_state *state = &ctx->submit_state; - - mutex_lock(&ctx->uring_lock); - - if (state->free_reqs) { - kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); - state->free_reqs = 0; - } - - io_flush_cached_locked_reqs(ctx, state); - io_req_cache_free(&state->free_list); - mutex_unlock(&ctx->uring_lock); -} - -static void io_wait_rsrc_data(struct io_rsrc_data *data) -{ - if (data && !atomic_dec_and_test(&data->refs)) - wait_for_completion(&data->done); -} - -static void io_ring_ctx_free(struct io_ring_ctx *ctx) -{ - io_sq_thread_finish(ctx); - - /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ - io_wait_rsrc_data(ctx->buf_data); - io_wait_rsrc_data(ctx->file_data); - - mutex_lock(&ctx->uring_lock); - if (ctx->buf_data) - __io_sqe_buffers_unregister(ctx); - if (ctx->file_data) - __io_sqe_files_unregister(ctx); - if (ctx->rings) - __io_cqring_overflow_flush(ctx, true); - mutex_unlock(&ctx->uring_lock); - io_eventfd_unregister(ctx); - io_destroy_buffers(ctx); - if (ctx->sq_creds) - put_cred(ctx->sq_creds); - - /* there are no registered resources left, nobody uses it */ - if (ctx->rsrc_node) - io_rsrc_node_destroy(ctx->rsrc_node); - if (ctx->rsrc_backup_node) - io_rsrc_node_destroy(ctx->rsrc_backup_node); - flush_delayed_work(&ctx->rsrc_put_work); - - WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); - WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); - -#if defined(CONFIG_UNIX) - if (ctx->ring_sock) { - ctx->ring_sock->file = NULL; /* so that iput() is called */ - sock_release(ctx->ring_sock); - } -#endif - WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); - - if (ctx->mm_account) { - mmdrop(ctx->mm_account); - ctx->mm_account = NULL; - } - - io_mem_free(ctx->rings); - io_mem_free(ctx->sq_sqes); - - percpu_ref_exit(&ctx->refs); - free_uid(ctx->user); - io_req_caches_free(ctx); - if (ctx->hash_map) - io_wq_put_hash(ctx->hash_map); - kfree(ctx->cancel_hash); - kfree(ctx->dummy_ubuf); - kfree(ctx); -} - -static __poll_t io_uring_poll(struct file *file, poll_table *wait) -{ - struct io_ring_ctx *ctx = file->private_data; - __poll_t mask = 0; - - poll_wait(file, &ctx->poll_wait, wait); - /* - * synchronizes with barrier from wq_has_sleeper call in - * io_commit_cqring - */ - smp_rmb(); - if (!io_sqring_full(ctx)) - mask |= EPOLLOUT | EPOLLWRNORM; - - /* - * Don't flush cqring overflow list here, just do a simple check. - * Otherwise there could possible be ABBA deadlock: - * CPU0 CPU1 - * ---- ---- - * lock(&ctx->uring_lock); - * lock(&ep->mtx); - * lock(&ctx->uring_lock); - * lock(&ep->mtx); - * - * Users may get EPOLLIN meanwhile seeing nothing in cqring, this - * pushs them to do the flush. - */ - if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) - mask |= EPOLLIN | EPOLLRDNORM; - - return mask; -} - -static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) -{ - const struct cred *creds; - - creds = xa_erase(&ctx->personalities, id); - if (creds) { - put_cred(creds); - return 0; - } - - return -EINVAL; -} - -struct io_tctx_exit { - struct callback_head task_work; - struct completion completion; - struct io_ring_ctx *ctx; -}; - -static void io_tctx_exit_cb(struct callback_head *cb) -{ - struct io_uring_task *tctx = current->io_uring; - struct io_tctx_exit *work; - - work = container_of(cb, struct io_tctx_exit, task_work); - /* - * When @in_idle, we're in cancellation and it's racy to remove the - * node. It'll be removed by the end of cancellation, just ignore it. - */ - if (!atomic_read(&tctx->in_idle)) - io_uring_del_tctx_node((unsigned long)work->ctx); - complete(&work->completion); -} - -static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) -{ - struct io_kiocb *req = container_of(work, struct io_kiocb, work); - - return req->ctx == data; -} - -static void io_ring_exit_work(struct work_struct *work) -{ - struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); - unsigned long timeout = jiffies + HZ * 60 * 5; - unsigned long interval = HZ / 20; - struct io_tctx_exit exit; - struct io_tctx_node *node; - int ret; - - /* - * If we're doing polled IO and end up having requests being - * submitted async (out-of-line), then completions can come in while - * we're waiting for refs to drop. We need to reap these manually, - * as nobody else will be looking for them. - */ - do { - io_uring_try_cancel_requests(ctx, NULL, true); - if (ctx->sq_data) { - struct io_sq_data *sqd = ctx->sq_data; - struct task_struct *tsk; - - io_sq_thread_park(sqd); - tsk = sqd->thread; - if (tsk && tsk->io_uring && tsk->io_uring->io_wq) - io_wq_cancel_cb(tsk->io_uring->io_wq, - io_cancel_ctx_cb, ctx, true); - io_sq_thread_unpark(sqd); - } - - if (WARN_ON_ONCE(time_after(jiffies, timeout))) { - /* there is little hope left, don't run it too often */ - interval = HZ * 60; - } - } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); - - init_completion(&exit.completion); - init_task_work(&exit.task_work, io_tctx_exit_cb); - exit.ctx = ctx; - /* - * Some may use context even when all refs and requests have been put, - * and they are free to do so while still holding uring_lock or - * completion_lock, see io_req_task_submit(). Apart from other work, - * this lock/unlock section also waits them to finish. - */ - mutex_lock(&ctx->uring_lock); - while (!list_empty(&ctx->tctx_list)) { - WARN_ON_ONCE(time_after(jiffies, timeout)); - - node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, - ctx_node); - /* don't spin on a single task if cancellation failed */ - list_rotate_left(&ctx->tctx_list); - ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); - if (WARN_ON_ONCE(ret)) - continue; - wake_up_process(node->task); - - mutex_unlock(&ctx->uring_lock); - wait_for_completion(&exit.completion); - mutex_lock(&ctx->uring_lock); - } - mutex_unlock(&ctx->uring_lock); - spin_lock(&ctx->completion_lock); - spin_unlock(&ctx->completion_lock); - - io_ring_ctx_free(ctx); -} - -/* Returns true if we found and killed one or more timeouts */ -static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, - bool cancel_all) -{ - struct io_kiocb *req, *tmp; - int canceled = 0; - - spin_lock(&ctx->completion_lock); - spin_lock_irq(&ctx->timeout_lock); - list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { - if (io_match_task(req, tsk, cancel_all)) { - io_kill_timeout(req, -ECANCELED); - canceled++; - } - } - spin_unlock_irq(&ctx->timeout_lock); - if (canceled != 0) - io_commit_cqring(ctx); - spin_unlock(&ctx->completion_lock); - if (canceled != 0) - io_cqring_ev_posted(ctx); - return canceled != 0; -} - -static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) -{ - unsigned long index; - struct creds *creds; - - mutex_lock(&ctx->uring_lock); - percpu_ref_kill(&ctx->refs); - if (ctx->rings) - __io_cqring_overflow_flush(ctx, true); - xa_for_each(&ctx->personalities, index, creds) - io_unregister_personality(ctx, index); - mutex_unlock(&ctx->uring_lock); - - io_kill_timeouts(ctx, NULL, true); - io_poll_remove_all(ctx, NULL, true); - - /* if we failed setting up the ctx, we might not have any rings */ - io_iopoll_try_reap_events(ctx); - - INIT_WORK(&ctx->exit_work, io_ring_exit_work); - /* - * Use system_unbound_wq to avoid spawning tons of event kworkers - * if we're exiting a ton of rings at the same time. It just adds - * noise and overhead, there's no discernable change in runtime - * over using system_wq. - */ - queue_work(system_unbound_wq, &ctx->exit_work); -} - -static int io_uring_release(struct inode *inode, struct file *file) -{ - struct io_ring_ctx *ctx = file->private_data; - - file->private_data = NULL; - io_ring_ctx_wait_and_kill(ctx); - return 0; -} - -struct io_task_cancel { - struct task_struct *task; - bool all; -}; - -static bool io_cancel_task_cb(struct io_wq_work *work, void *data) -{ - struct io_kiocb *req = container_of(work, struct io_kiocb, work); - struct io_task_cancel *cancel = data; - - return io_match_task_safe(req, cancel->task, cancel->all); -} - -static bool io_cancel_defer_files(struct io_ring_ctx *ctx, - struct task_struct *task, bool cancel_all) -{ - struct io_defer_entry *de; - LIST_HEAD(list); - - spin_lock(&ctx->completion_lock); - list_for_each_entry_reverse(de, &ctx->defer_list, list) { - if (io_match_task_safe(de->req, task, cancel_all)) { - list_cut_position(&list, &ctx->defer_list, &de->list); - break; - } - } - spin_unlock(&ctx->completion_lock); - if (list_empty(&list)) - return false; - - while (!list_empty(&list)) { - de = list_first_entry(&list, struct io_defer_entry, list); - list_del_init(&de->list); - io_req_complete_failed(de->req, -ECANCELED); - kfree(de); - } - return true; -} - -static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) -{ - struct io_tctx_node *node; - enum io_wq_cancel cret; - bool ret = false; - - mutex_lock(&ctx->uring_lock); - list_for_each_entry(node, &ctx->tctx_list, ctx_node) { - struct io_uring_task *tctx = node->task->io_uring; - - /* - * io_wq will stay alive while we hold uring_lock, because it's - * killed after ctx nodes, which requires to take the lock. - */ - if (!tctx || !tctx->io_wq) - continue; - cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); - ret |= (cret != IO_WQ_CANCEL_NOTFOUND); - } - mutex_unlock(&ctx->uring_lock); - - return ret; -} - -static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, - struct task_struct *task, - bool cancel_all) -{ - struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; - struct io_uring_task *tctx = task ? task->io_uring : NULL; - - while (1) { - enum io_wq_cancel cret; - bool ret = false; - - if (!task) { - ret |= io_uring_try_cancel_iowq(ctx); - } else if (tctx && tctx->io_wq) { - /* - * Cancels requests of all rings, not only @ctx, but - * it's fine as the task is in exit/exec. - */ - cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, - &cancel, true); - ret |= (cret != IO_WQ_CANCEL_NOTFOUND); - } - - /* SQPOLL thread does its own polling */ - if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || - (ctx->sq_data && ctx->sq_data->thread == current)) { - while (!list_empty_careful(&ctx->iopoll_list)) { - io_iopoll_try_reap_events(ctx); - ret = true; - } - } - - ret |= io_cancel_defer_files(ctx, task, cancel_all); - ret |= io_poll_remove_all(ctx, task, cancel_all); - ret |= io_kill_timeouts(ctx, task, cancel_all); - if (task) - ret |= io_run_task_work(); - if (!ret) - break; - cond_resched(); - } -} - -static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) -{ - struct io_uring_task *tctx = current->io_uring; - struct io_tctx_node *node; - int ret; - - if (unlikely(!tctx)) { - ret = io_uring_alloc_task_context(current, ctx); - if (unlikely(ret)) - return ret; - - tctx = current->io_uring; - if (ctx->iowq_limits_set) { - unsigned int limits[2] = { ctx->iowq_limits[0], - ctx->iowq_limits[1], }; - - ret = io_wq_max_workers(tctx->io_wq, limits); - if (ret) - return ret; - } - } - if (!xa_load(&tctx->xa, (unsigned long)ctx)) { - node = kmalloc(sizeof(*node), GFP_KERNEL); - if (!node) - return -ENOMEM; - node->ctx = ctx; - node->task = current; - - ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, - node, GFP_KERNEL)); - if (ret) { - kfree(node); - return ret; - } - - mutex_lock(&ctx->uring_lock); - list_add(&node->ctx_node, &ctx->tctx_list); - mutex_unlock(&ctx->uring_lock); - } - tctx->last = ctx; - return 0; -} - -/* - * Note that this task has used io_uring. We use it for cancelation purposes. - */ -static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) -{ - struct io_uring_task *tctx = current->io_uring; - - if (likely(tctx && tctx->last == ctx)) - return 0; - return __io_uring_add_tctx_node(ctx); -} - -/* - * Remove this io_uring_file -> task mapping. - */ -static void io_uring_del_tctx_node(unsigned long index) -{ - struct io_uring_task *tctx = current->io_uring; - struct io_tctx_node *node; - - if (!tctx) - return; - node = xa_erase(&tctx->xa, index); - if (!node) - return; - - WARN_ON_ONCE(current != node->task); - WARN_ON_ONCE(list_empty(&node->ctx_node)); - - mutex_lock(&node->ctx->uring_lock); - list_del(&node->ctx_node); - mutex_unlock(&node->ctx->uring_lock); - - if (tctx->last == node->ctx) - tctx->last = NULL; - kfree(node); -} - -static void io_uring_clean_tctx(struct io_uring_task *tctx) -{ - struct io_wq *wq = tctx->io_wq; - struct io_tctx_node *node; - unsigned long index; - - xa_for_each(&tctx->xa, index, node) { - io_uring_del_tctx_node(index); - cond_resched(); - } - if (wq) { - /* - * Must be after io_uring_del_task_file() (removes nodes under - * uring_lock) to avoid race with io_uring_try_cancel_iowq(). - */ - io_wq_put_and_exit(wq); - tctx->io_wq = NULL; - } -} - -static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) -{ - if (tracked) - return atomic_read(&tctx->inflight_tracked); - return percpu_counter_sum(&tctx->inflight); -} - -/* - * Find any io_uring ctx that this task has registered or done IO on, and cancel - * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. - */ -static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) -{ - struct io_uring_task *tctx = current->io_uring; - struct io_ring_ctx *ctx; - s64 inflight; - DEFINE_WAIT(wait); - - WARN_ON_ONCE(sqd && sqd->thread != current); - - if (!current->io_uring) - return; - if (tctx->io_wq) - io_wq_exit_start(tctx->io_wq); - - atomic_inc(&tctx->in_idle); - do { - io_uring_drop_tctx_refs(current); - /* read completions before cancelations */ - inflight = tctx_inflight(tctx, !cancel_all); - if (!inflight) - break; - - if (!sqd) { - struct io_tctx_node *node; - unsigned long index; - - xa_for_each(&tctx->xa, index, node) { - /* sqpoll task will cancel all its requests */ - if (node->ctx->sq_data) - continue; - io_uring_try_cancel_requests(node->ctx, current, - cancel_all); - } - } else { - list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) - io_uring_try_cancel_requests(ctx, current, - cancel_all); - } - - prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); - io_run_task_work(); - io_uring_drop_tctx_refs(current); - - /* - * If we've seen completions, retry without waiting. This - * avoids a race where a completion comes in before we did - * prepare_to_wait(). - */ - if (inflight == tctx_inflight(tctx, !cancel_all)) - schedule(); - finish_wait(&tctx->wait, &wait); - } while (1); - - io_uring_clean_tctx(tctx); - if (cancel_all) { - /* - * We shouldn't run task_works after cancel, so just leave - * ->in_idle set for normal exit. - */ - atomic_dec(&tctx->in_idle); - /* for exec all current's requests should be gone, kill tctx */ - __io_uring_free(current); - } -} - -void __io_uring_cancel(bool cancel_all) -{ - io_uring_cancel_generic(cancel_all, NULL); -} - -static void *io_uring_validate_mmap_request(struct file *file, - loff_t pgoff, size_t sz) -{ - struct io_ring_ctx *ctx = file->private_data; - loff_t offset = pgoff << PAGE_SHIFT; - struct page *page; - void *ptr; - - switch (offset) { - case IORING_OFF_SQ_RING: - case IORING_OFF_CQ_RING: - ptr = ctx->rings; - break; - case IORING_OFF_SQES: - ptr = ctx->sq_sqes; - break; - default: - return ERR_PTR(-EINVAL); - } - - page = virt_to_head_page(ptr); - if (sz > page_size(page)) - return ERR_PTR(-EINVAL); - - return ptr; -} - -#ifdef CONFIG_MMU - -static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) -{ - size_t sz = vma->vm_end - vma->vm_start; - unsigned long pfn; - void *ptr; - - ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); - if (IS_ERR(ptr)) - return PTR_ERR(ptr); - - pfn = virt_to_phys(ptr) >> PAGE_SHIFT; - return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); -} - -#else /* !CONFIG_MMU */ - -static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) -{ - return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; -} - -static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) -{ - return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; -} - -static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, - unsigned long addr, unsigned long len, - unsigned long pgoff, unsigned long flags) -{ - void *ptr; - - ptr = io_uring_validate_mmap_request(file, pgoff, len); - if (IS_ERR(ptr)) - return PTR_ERR(ptr); - - return (unsigned long) ptr; -} - -#endif /* !CONFIG_MMU */ - -static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) -{ - DEFINE_WAIT(wait); - - do { - if (!io_sqring_full(ctx)) - break; - prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); - - if (!io_sqring_full(ctx)) - break; - schedule(); - } while (!signal_pending(current)); - - finish_wait(&ctx->sqo_sq_wait, &wait); - return 0; -} - -static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, - struct __kernel_timespec __user **ts, - const sigset_t __user **sig) -{ - struct io_uring_getevents_arg arg; - - /* - * If EXT_ARG isn't set, then we have no timespec and the argp pointer - * is just a pointer to the sigset_t. - */ - if (!(flags & IORING_ENTER_EXT_ARG)) { - *sig = (const sigset_t __user *) argp; - *ts = NULL; - return 0; - } - - /* - * EXT_ARG is set - ensure we agree on the size of it and copy in our - * timespec and sigset_t pointers if good. - */ - if (*argsz != sizeof(arg)) - return -EINVAL; - if (copy_from_user(&arg, argp, sizeof(arg))) - return -EFAULT; - if (arg.pad) - return -EINVAL; - *sig = u64_to_user_ptr(arg.sigmask); - *argsz = arg.sigmask_sz; - *ts = u64_to_user_ptr(arg.ts); - return 0; -} - -SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, - u32, min_complete, u32, flags, const void __user *, argp, - size_t, argsz) -{ - struct io_ring_ctx *ctx; - int submitted = 0; - struct fd f; - long ret; - - io_run_task_work(); - - if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | - IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) - return -EINVAL; - - f = fdget(fd); - if (unlikely(!f.file)) - return -EBADF; - - ret = -EOPNOTSUPP; - if (unlikely(f.file->f_op != &io_uring_fops)) - goto out_fput; - - ret = -ENXIO; - ctx = f.file->private_data; - if (unlikely(!percpu_ref_tryget(&ctx->refs))) - goto out_fput; - - ret = -EBADFD; - if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) - goto out; - - /* - * For SQ polling, the thread will do all submissions and completions. - * Just return the requested submit count, and wake the thread if - * we were asked to. - */ - ret = 0; - if (ctx->flags & IORING_SETUP_SQPOLL) { - io_cqring_overflow_flush(ctx); - - if (unlikely(ctx->sq_data->thread == NULL)) { - ret = -EOWNERDEAD; - goto out; - } - if (flags & IORING_ENTER_SQ_WAKEUP) - wake_up(&ctx->sq_data->wait); - if (flags & IORING_ENTER_SQ_WAIT) { - ret = io_sqpoll_wait_sq(ctx); - if (ret) - goto out; - } - submitted = to_submit; - } else if (to_submit) { - ret = io_uring_add_tctx_node(ctx); - if (unlikely(ret)) - goto out; - mutex_lock(&ctx->uring_lock); - submitted = io_submit_sqes(ctx, to_submit); - mutex_unlock(&ctx->uring_lock); - - if (submitted != to_submit) - goto out; - } - if (flags & IORING_ENTER_GETEVENTS) { - const sigset_t __user *sig; - struct __kernel_timespec __user *ts; - - ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); - if (unlikely(ret)) - goto out; - - min_complete = min(min_complete, ctx->cq_entries); - - /* - * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user - * space applications don't need to do io completion events - * polling again, they can rely on io_sq_thread to do polling - * work, which can reduce cpu usage and uring_lock contention. - */ - if (ctx->flags & IORING_SETUP_IOPOLL && - !(ctx->flags & IORING_SETUP_SQPOLL)) { - ret = io_iopoll_check(ctx, min_complete); - } else { - ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); - } - } - -out: - percpu_ref_put(&ctx->refs); -out_fput: - fdput(f); - return submitted ? submitted : ret; -} - -#ifdef CONFIG_PROC_FS -static int io_uring_show_cred(struct seq_file *m, unsigned int id, - const struct cred *cred) -{ - struct user_namespace *uns = seq_user_ns(m); - struct group_info *gi; - kernel_cap_t cap; - unsigned __capi; - int g; - - seq_printf(m, "%5d\n", id); - seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); - seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); - seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); - seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); - seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); - seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); - seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); - seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); - seq_puts(m, "\n\tGroups:\t"); - gi = cred->group_info; - for (g = 0; g < gi->ngroups; g++) { - seq_put_decimal_ull(m, g ? " " : "", - from_kgid_munged(uns, gi->gid[g])); - } - seq_puts(m, "\n\tCapEff:\t"); - cap = cred->cap_effective; - CAP_FOR_EACH_U32(__capi) - seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); - seq_putc(m, '\n'); - return 0; -} - -static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) -{ - struct io_sq_data *sq = NULL; - bool has_lock; - int i; - - /* - * Avoid ABBA deadlock between the seq lock and the io_uring mutex, - * since fdinfo case grabs it in the opposite direction of normal use - * cases. If we fail to get the lock, we just don't iterate any - * structures that could be going away outside the io_uring mutex. - */ - has_lock = mutex_trylock(&ctx->uring_lock); - - if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { - sq = ctx->sq_data; - if (!sq->thread) - sq = NULL; - } - - seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); - seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); - seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); - for (i = 0; has_lock && i < ctx->nr_user_files; i++) { - struct file *f = io_file_from_index(ctx, i); - - if (f) - seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); - else - seq_printf(m, "%5u: \n", i); - } - seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); - for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { - struct io_mapped_ubuf *buf = ctx->user_bufs[i]; - unsigned int len = buf->ubuf_end - buf->ubuf; - - seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); - } - if (has_lock && !xa_empty(&ctx->personalities)) { - unsigned long index; - const struct cred *cred; - - seq_printf(m, "Personalities:\n"); - xa_for_each(&ctx->personalities, index, cred) - io_uring_show_cred(m, index, cred); - } - seq_printf(m, "PollList:\n"); - spin_lock(&ctx->completion_lock); - for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { - struct hlist_head *list = &ctx->cancel_hash[i]; - struct io_kiocb *req; - - hlist_for_each_entry(req, list, hash_node) - seq_printf(m, " op=%d, task_works=%d\n", req->opcode, - req->task->task_works != NULL); - } - spin_unlock(&ctx->completion_lock); - if (has_lock) - mutex_unlock(&ctx->uring_lock); -} - -static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) -{ - struct io_ring_ctx *ctx = f->private_data; - - if (percpu_ref_tryget(&ctx->refs)) { - __io_uring_show_fdinfo(ctx, m); - percpu_ref_put(&ctx->refs); - } -} -#endif - -static const struct file_operations io_uring_fops = { - .release = io_uring_release, - .mmap = io_uring_mmap, -#ifndef CONFIG_MMU - .get_unmapped_area = io_uring_nommu_get_unmapped_area, - .mmap_capabilities = io_uring_nommu_mmap_capabilities, -#endif - .poll = io_uring_poll, -#ifdef CONFIG_PROC_FS - .show_fdinfo = io_uring_show_fdinfo, -#endif -}; - -static int io_allocate_scq_urings(struct io_ring_ctx *ctx, - struct io_uring_params *p) -{ - struct io_rings *rings; - size_t size, sq_array_offset; - - /* make sure these are sane, as we already accounted them */ - ctx->sq_entries = p->sq_entries; - ctx->cq_entries = p->cq_entries; - - size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); - if (size == SIZE_MAX) - return -EOVERFLOW; - - rings = io_mem_alloc(size); - if (!rings) - return -ENOMEM; - - ctx->rings = rings; - ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); - rings->sq_ring_mask = p->sq_entries - 1; - rings->cq_ring_mask = p->cq_entries - 1; - rings->sq_ring_entries = p->sq_entries; - rings->cq_ring_entries = p->cq_entries; - - size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); - if (size == SIZE_MAX) { - io_mem_free(ctx->rings); - ctx->rings = NULL; - return -EOVERFLOW; - } - - ctx->sq_sqes = io_mem_alloc(size); - if (!ctx->sq_sqes) { - io_mem_free(ctx->rings); - ctx->rings = NULL; - return -ENOMEM; - } - - return 0; -} - -static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) -{ - int ret, fd; - - fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); - if (fd < 0) - return fd; - - ret = io_uring_add_tctx_node(ctx); - if (ret) { - put_unused_fd(fd); - return ret; - } - fd_install(fd, file); - return fd; -} - -/* - * Allocate an anonymous fd, this is what constitutes the application - * visible backing of an io_uring instance. The application mmaps this - * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, - * we have to tie this fd to a socket for file garbage collection purposes. - */ -static struct file *io_uring_get_file(struct io_ring_ctx *ctx) -{ - struct file *file; -#if defined(CONFIG_UNIX) - int ret; - - ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, - &ctx->ring_sock); - if (ret) - return ERR_PTR(ret); -#endif - - file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, - O_RDWR | O_CLOEXEC); -#if defined(CONFIG_UNIX) - if (IS_ERR(file)) { - sock_release(ctx->ring_sock); - ctx->ring_sock = NULL; - } else { - ctx->ring_sock->file = file; - } -#endif - return file; -} - -static int io_uring_create(unsigned entries, struct io_uring_params *p, - struct io_uring_params __user *params) -{ - struct io_ring_ctx *ctx; - struct file *file; - int ret; - - if (!entries) - return -EINVAL; - if (entries > IORING_MAX_ENTRIES) { - if (!(p->flags & IORING_SETUP_CLAMP)) - return -EINVAL; - entries = IORING_MAX_ENTRIES; - } - - /* - * Use twice as many entries for the CQ ring. It's possible for the - * application to drive a higher depth than the size of the SQ ring, - * since the sqes are only used at submission time. This allows for - * some flexibility in overcommitting a bit. If the application has - * set IORING_SETUP_CQSIZE, it will have passed in the desired number - * of CQ ring entries manually. - */ - p->sq_entries = roundup_pow_of_two(entries); - if (p->flags & IORING_SETUP_CQSIZE) { - /* - * If IORING_SETUP_CQSIZE is set, we do the same roundup - * to a power-of-two, if it isn't already. We do NOT impose - * any cq vs sq ring sizing. - */ - if (!p->cq_entries) - return -EINVAL; - if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { - if (!(p->flags & IORING_SETUP_CLAMP)) - return -EINVAL; - p->cq_entries = IORING_MAX_CQ_ENTRIES; - } - p->cq_entries = roundup_pow_of_two(p->cq_entries); - if (p->cq_entries < p->sq_entries) - return -EINVAL; - } else { - p->cq_entries = 2 * p->sq_entries; - } - - ctx = io_ring_ctx_alloc(p); - if (!ctx) - return -ENOMEM; - ctx->compat = in_compat_syscall(); - if (!capable(CAP_IPC_LOCK)) - ctx->user = get_uid(current_user()); - - /* - * This is just grabbed for accounting purposes. When a process exits, - * the mm is exited and dropped before the files, hence we need to hang - * on to this mm purely for the purposes of being able to unaccount - * memory (locked/pinned vm). It's not used for anything else. - */ - mmgrab(current->mm); - ctx->mm_account = current->mm; - - ret = io_allocate_scq_urings(ctx, p); - if (ret) - goto err; - - ret = io_sq_offload_create(ctx, p); - if (ret) - goto err; - /* always set a rsrc node */ - ret = io_rsrc_node_switch_start(ctx); - if (ret) - goto err; - io_rsrc_node_switch(ctx, NULL); - - memset(&p->sq_off, 0, sizeof(p->sq_off)); - p->sq_off.head = offsetof(struct io_rings, sq.head); - p->sq_off.tail = offsetof(struct io_rings, sq.tail); - p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); - p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); - p->sq_off.flags = offsetof(struct io_rings, sq_flags); - p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); - p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; - - memset(&p->cq_off, 0, sizeof(p->cq_off)); - p->cq_off.head = offsetof(struct io_rings, cq.head); - p->cq_off.tail = offsetof(struct io_rings, cq.tail); - p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); - p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); - p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); - p->cq_off.cqes = offsetof(struct io_rings, cqes); - p->cq_off.flags = offsetof(struct io_rings, cq_flags); - - p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | - IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | - IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | - IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | - IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | - IORING_FEAT_RSRC_TAGS; - - if (copy_to_user(params, p, sizeof(*p))) { - ret = -EFAULT; - goto err; - } - - file = io_uring_get_file(ctx); - if (IS_ERR(file)) { - ret = PTR_ERR(file); - goto err; - } - - /* - * Install ring fd as the very last thing, so we don't risk someone - * having closed it before we finish setup - */ - ret = io_uring_install_fd(ctx, file); - if (ret < 0) { - /* fput will clean it up */ - fput(file); - return ret; - } - - trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); - return ret; -err: - io_ring_ctx_wait_and_kill(ctx); - return ret; -} - -/* - * Sets up an aio uring context, and returns the fd. Applications asks for a - * ring size, we return the actual sq/cq ring sizes (among other things) in the - * params structure passed in. - */ -static long io_uring_setup(u32 entries, struct io_uring_params __user *params) -{ - struct io_uring_params p; - int i; - - if (copy_from_user(&p, params, sizeof(p))) - return -EFAULT; - for (i = 0; i < ARRAY_SIZE(p.resv); i++) { - if (p.resv[i]) - return -EINVAL; - } - - if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | - IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | - IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | - IORING_SETUP_R_DISABLED)) - return -EINVAL; - - return io_uring_create(entries, &p, params); -} - -SYSCALL_DEFINE2(io_uring_setup, u32, entries, - struct io_uring_params __user *, params) -{ - return io_uring_setup(entries, params); -} - -static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) -{ - struct io_uring_probe *p; - size_t size; - int i, ret; - - size = struct_size(p, ops, nr_args); - if (size == SIZE_MAX) - return -EOVERFLOW; - p = kzalloc(size, GFP_KERNEL); - if (!p) - return -ENOMEM; - - ret = -EFAULT; - if (copy_from_user(p, arg, size)) - goto out; - ret = -EINVAL; - if (memchr_inv(p, 0, size)) - goto out; - - p->last_op = IORING_OP_LAST - 1; - if (nr_args > IORING_OP_LAST) - nr_args = IORING_OP_LAST; - - for (i = 0; i < nr_args; i++) { - p->ops[i].op = i; - if (!io_op_defs[i].not_supported) - p->ops[i].flags = IO_URING_OP_SUPPORTED; - } - p->ops_len = i; - - ret = 0; - if (copy_to_user(arg, p, size)) - ret = -EFAULT; -out: - kfree(p); - return ret; -} - -static int io_register_personality(struct io_ring_ctx *ctx) -{ - const struct cred *creds; - u32 id; - int ret; - - creds = get_current_cred(); - - ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, - XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); - if (ret < 0) { - put_cred(creds); - return ret; - } - return id; -} - -static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, - unsigned int nr_args) -{ - struct io_uring_restriction *res; - size_t size; - int i, ret; - - /* Restrictions allowed only if rings started disabled */ - if (!(ctx->flags & IORING_SETUP_R_DISABLED)) - return -EBADFD; - - /* We allow only a single restrictions registration */ - if (ctx->restrictions.registered) - return -EBUSY; - - if (!arg || nr_args > IORING_MAX_RESTRICTIONS) - return -EINVAL; - - size = array_size(nr_args, sizeof(*res)); - if (size == SIZE_MAX) - return -EOVERFLOW; - - res = memdup_user(arg, size); - if (IS_ERR(res)) - return PTR_ERR(res); - - ret = 0; - - for (i = 0; i < nr_args; i++) { - switch (res[i].opcode) { - case IORING_RESTRICTION_REGISTER_OP: - if (res[i].register_op >= IORING_REGISTER_LAST) { - ret = -EINVAL; - goto out; - } - - __set_bit(res[i].register_op, - ctx->restrictions.register_op); - break; - case IORING_RESTRICTION_SQE_OP: - if (res[i].sqe_op >= IORING_OP_LAST) { - ret = -EINVAL; - goto out; - } - - __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); - break; - case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: - ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; - break; - case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: - ctx->restrictions.sqe_flags_required = res[i].sqe_flags; - break; - default: - ret = -EINVAL; - goto out; - } - } - -out: - /* Reset all restrictions if an error happened */ - if (ret != 0) - memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); - else - ctx->restrictions.registered = true; - - kfree(res); - return ret; -} - -static int io_register_enable_rings(struct io_ring_ctx *ctx) -{ - if (!(ctx->flags & IORING_SETUP_R_DISABLED)) - return -EBADFD; - - if (ctx->restrictions.registered) - ctx->restricted = 1; - - ctx->flags &= ~IORING_SETUP_R_DISABLED; - if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) - wake_up(&ctx->sq_data->wait); - return 0; -} - -static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, - struct io_uring_rsrc_update2 *up, - unsigned nr_args) -{ - __u32 tmp; - int err; - - if (check_add_overflow(up->offset, nr_args, &tmp)) - return -EOVERFLOW; - err = io_rsrc_node_switch_start(ctx); - if (err) - return err; - - switch (type) { - case IORING_RSRC_FILE: - return __io_sqe_files_update(ctx, up, nr_args); - case IORING_RSRC_BUFFER: - return __io_sqe_buffers_update(ctx, up, nr_args); - } - return -EINVAL; -} - -static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, - unsigned nr_args) -{ - struct io_uring_rsrc_update2 up; - - if (!nr_args) - return -EINVAL; - memset(&up, 0, sizeof(up)); - if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) - return -EFAULT; - if (up.resv || up.resv2) - return -EINVAL; - return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); -} - -static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, - unsigned size, unsigned type) -{ - struct io_uring_rsrc_update2 up; - - if (size != sizeof(up)) - return -EINVAL; - if (copy_from_user(&up, arg, sizeof(up))) - return -EFAULT; - if (!up.nr || up.resv || up.resv2) - return -EINVAL; - return __io_register_rsrc_update(ctx, type, &up, up.nr); -} - -static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, - unsigned int size, unsigned int type) -{ - struct io_uring_rsrc_register rr; - - /* keep it extendible */ - if (size != sizeof(rr)) - return -EINVAL; - - memset(&rr, 0, sizeof(rr)); - if (copy_from_user(&rr, arg, size)) - return -EFAULT; - if (!rr.nr || rr.resv || rr.resv2) - return -EINVAL; - - switch (type) { - case IORING_RSRC_FILE: - return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), - rr.nr, u64_to_user_ptr(rr.tags)); - case IORING_RSRC_BUFFER: - return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), - rr.nr, u64_to_user_ptr(rr.tags)); - } - return -EINVAL; -} - -static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, - unsigned len) -{ - struct io_uring_task *tctx = current->io_uring; - cpumask_var_t new_mask; - int ret; - - if (!tctx || !tctx->io_wq) - return -EINVAL; - - if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) - return -ENOMEM; - - cpumask_clear(new_mask); - if (len > cpumask_size()) - len = cpumask_size(); - - if (in_compat_syscall()) { - ret = compat_get_bitmap(cpumask_bits(new_mask), - (const compat_ulong_t __user *)arg, - len * 8 /* CHAR_BIT */); - } else { - ret = copy_from_user(new_mask, arg, len); - } - - if (ret) { - free_cpumask_var(new_mask); - return -EFAULT; - } - - ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); - free_cpumask_var(new_mask); - return ret; -} - -static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) -{ - struct io_uring_task *tctx = current->io_uring; - - if (!tctx || !tctx->io_wq) - return -EINVAL; - - return io_wq_cpu_affinity(tctx->io_wq, NULL); -} - -static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, - void __user *arg) - __must_hold(&ctx->uring_lock) -{ - struct io_tctx_node *node; - struct io_uring_task *tctx = NULL; - struct io_sq_data *sqd = NULL; - __u32 new_count[2]; - int i, ret; - - if (copy_from_user(new_count, arg, sizeof(new_count))) - return -EFAULT; - for (i = 0; i < ARRAY_SIZE(new_count); i++) - if (new_count[i] > INT_MAX) - return -EINVAL; - - if (ctx->flags & IORING_SETUP_SQPOLL) { - sqd = ctx->sq_data; - if (sqd) { - /* - * Observe the correct sqd->lock -> ctx->uring_lock - * ordering. Fine to drop uring_lock here, we hold - * a ref to the ctx. - */ - refcount_inc(&sqd->refs); - mutex_unlock(&ctx->uring_lock); - mutex_lock(&sqd->lock); - mutex_lock(&ctx->uring_lock); - if (sqd->thread) - tctx = sqd->thread->io_uring; - } - } else { - tctx = current->io_uring; - } - - BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); - - for (i = 0; i < ARRAY_SIZE(new_count); i++) - if (new_count[i]) - ctx->iowq_limits[i] = new_count[i]; - ctx->iowq_limits_set = true; - - ret = -EINVAL; - if (tctx && tctx->io_wq) { - ret = io_wq_max_workers(tctx->io_wq, new_count); - if (ret) - goto err; - } else { - memset(new_count, 0, sizeof(new_count)); - } - - if (sqd) { - mutex_unlock(&sqd->lock); - io_put_sq_data(sqd); - } - - if (copy_to_user(arg, new_count, sizeof(new_count))) - return -EFAULT; - - /* that's it for SQPOLL, only the SQPOLL task creates requests */ - if (sqd) - return 0; - - /* now propagate the restriction to all registered users */ - list_for_each_entry(node, &ctx->tctx_list, ctx_node) { - struct io_uring_task *tctx = node->task->io_uring; - - if (WARN_ON_ONCE(!tctx->io_wq)) - continue; - - for (i = 0; i < ARRAY_SIZE(new_count); i++) - new_count[i] = ctx->iowq_limits[i]; - /* ignore errors, it always returns zero anyway */ - (void)io_wq_max_workers(tctx->io_wq, new_count); - } - return 0; -err: - if (sqd) { - mutex_unlock(&sqd->lock); - io_put_sq_data(sqd); - } - return ret; -} - -static bool io_register_op_must_quiesce(int op) -{ - switch (op) { - case IORING_REGISTER_BUFFERS: - case IORING_UNREGISTER_BUFFERS: - case IORING_REGISTER_FILES: - case IORING_UNREGISTER_FILES: - case IORING_REGISTER_FILES_UPDATE: - case IORING_REGISTER_PROBE: - case IORING_REGISTER_PERSONALITY: - case IORING_UNREGISTER_PERSONALITY: - case IORING_REGISTER_FILES2: - case IORING_REGISTER_FILES_UPDATE2: - case IORING_REGISTER_BUFFERS2: - case IORING_REGISTER_BUFFERS_UPDATE: - case IORING_REGISTER_IOWQ_AFF: - case IORING_UNREGISTER_IOWQ_AFF: - case IORING_REGISTER_IOWQ_MAX_WORKERS: - return false; - default: - return true; - } -} - -static int io_ctx_quiesce(struct io_ring_ctx *ctx) -{ - long ret; - - percpu_ref_kill(&ctx->refs); - - /* - * Drop uring mutex before waiting for references to exit. If another - * thread is currently inside io_uring_enter() it might need to grab the - * uring_lock to make progress. If we hold it here across the drain - * wait, then we can deadlock. It's safe to drop the mutex here, since - * no new references will come in after we've killed the percpu ref. - */ - mutex_unlock(&ctx->uring_lock); - do { - ret = wait_for_completion_interruptible(&ctx->ref_comp); - if (!ret) - break; - ret = io_run_task_work_sig(); - } while (ret >= 0); - mutex_lock(&ctx->uring_lock); - - if (ret) - io_refs_resurrect(&ctx->refs, &ctx->ref_comp); - return ret; -} - -static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, - void __user *arg, unsigned nr_args) - __releases(ctx->uring_lock) - __acquires(ctx->uring_lock) -{ - int ret; - - /* - * We're inside the ring mutex, if the ref is already dying, then - * someone else killed the ctx or is already going through - * io_uring_register(). - */ - if (percpu_ref_is_dying(&ctx->refs)) - return -ENXIO; - - if (ctx->restricted) { - if (opcode >= IORING_REGISTER_LAST) - return -EINVAL; - opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); - if (!test_bit(opcode, ctx->restrictions.register_op)) - return -EACCES; - } - - if (io_register_op_must_quiesce(opcode)) { - ret = io_ctx_quiesce(ctx); - if (ret) - return ret; - } - - switch (opcode) { - case IORING_REGISTER_BUFFERS: - ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); - break; - case IORING_UNREGISTER_BUFFERS: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_sqe_buffers_unregister(ctx); - break; - case IORING_REGISTER_FILES: - ret = io_sqe_files_register(ctx, arg, nr_args, NULL); - break; - case IORING_UNREGISTER_FILES: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_sqe_files_unregister(ctx); - break; - case IORING_REGISTER_FILES_UPDATE: - ret = io_register_files_update(ctx, arg, nr_args); - break; - case IORING_REGISTER_EVENTFD: - case IORING_REGISTER_EVENTFD_ASYNC: - ret = -EINVAL; - if (nr_args != 1) - break; - ret = io_eventfd_register(ctx, arg); - if (ret) - break; - if (opcode == IORING_REGISTER_EVENTFD_ASYNC) - ctx->eventfd_async = 1; - else - ctx->eventfd_async = 0; - break; - case IORING_UNREGISTER_EVENTFD: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_eventfd_unregister(ctx); - break; - case IORING_REGISTER_PROBE: - ret = -EINVAL; - if (!arg || nr_args > 256) - break; - ret = io_probe(ctx, arg, nr_args); - break; - case IORING_REGISTER_PERSONALITY: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_register_personality(ctx); - break; - case IORING_UNREGISTER_PERSONALITY: - ret = -EINVAL; - if (arg) - break; - ret = io_unregister_personality(ctx, nr_args); - break; - case IORING_REGISTER_ENABLE_RINGS: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_register_enable_rings(ctx); - break; - case IORING_REGISTER_RESTRICTIONS: - ret = io_register_restrictions(ctx, arg, nr_args); - break; - case IORING_REGISTER_FILES2: - ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); - break; - case IORING_REGISTER_FILES_UPDATE2: - ret = io_register_rsrc_update(ctx, arg, nr_args, - IORING_RSRC_FILE); - break; - case IORING_REGISTER_BUFFERS2: - ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); - break; - case IORING_REGISTER_BUFFERS_UPDATE: - ret = io_register_rsrc_update(ctx, arg, nr_args, - IORING_RSRC_BUFFER); - break; - case IORING_REGISTER_IOWQ_AFF: - ret = -EINVAL; - if (!arg || !nr_args) - break; - ret = io_register_iowq_aff(ctx, arg, nr_args); - break; - case IORING_UNREGISTER_IOWQ_AFF: - ret = -EINVAL; - if (arg || nr_args) - break; - ret = io_unregister_iowq_aff(ctx); - break; - case IORING_REGISTER_IOWQ_MAX_WORKERS: - ret = -EINVAL; - if (!arg || nr_args != 2) - break; - ret = io_register_iowq_max_workers(ctx, arg); - break; - default: - ret = -EINVAL; - break; - } - - if (io_register_op_must_quiesce(opcode)) { - /* bring the ctx back to life */ - percpu_ref_reinit(&ctx->refs); - reinit_completion(&ctx->ref_comp); - } - return ret; -} - -SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, - void __user *, arg, unsigned int, nr_args) -{ - struct io_ring_ctx *ctx; - long ret = -EBADF; - struct fd f; - - f = fdget(fd); - if (!f.file) - return -EBADF; - - ret = -EOPNOTSUPP; - if (f.file->f_op != &io_uring_fops) - goto out_fput; - - ctx = f.file->private_data; - - io_run_task_work(); - - mutex_lock(&ctx->uring_lock); - ret = __io_uring_register(ctx, opcode, arg, nr_args); - mutex_unlock(&ctx->uring_lock); - trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, - ctx->cq_ev_fd != NULL, ret); -out_fput: - fdput(f); - return ret; -} - -static int __init io_uring_init(void) -{ -#define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ - BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ - BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ -} while (0) - -#define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ - __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) - BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); - BUILD_BUG_SQE_ELEM(0, __u8, opcode); - BUILD_BUG_SQE_ELEM(1, __u8, flags); - BUILD_BUG_SQE_ELEM(2, __u16, ioprio); - BUILD_BUG_SQE_ELEM(4, __s32, fd); - BUILD_BUG_SQE_ELEM(8, __u64, off); - BUILD_BUG_SQE_ELEM(8, __u64, addr2); - BUILD_BUG_SQE_ELEM(16, __u64, addr); - BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); - BUILD_BUG_SQE_ELEM(24, __u32, len); - BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); - BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); - BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); - BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); - BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); - BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); - BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); - BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); - BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); - BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); - BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); - BUILD_BUG_SQE_ELEM(28, __u32, open_flags); - BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); - BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); - BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); - BUILD_BUG_SQE_ELEM(32, __u64, user_data); - BUILD_BUG_SQE_ELEM(40, __u16, buf_index); - BUILD_BUG_SQE_ELEM(40, __u16, buf_group); - BUILD_BUG_SQE_ELEM(42, __u16, personality); - BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); - BUILD_BUG_SQE_ELEM(44, __u32, file_index); - - BUILD_BUG_ON(sizeof(struct io_uring_files_update) != - sizeof(struct io_uring_rsrc_update)); - BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > - sizeof(struct io_uring_rsrc_update2)); - - /* ->buf_index is u16 */ - BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); - - /* should fit into one byte */ - BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); - - BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); - BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); - - req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | - SLAB_ACCOUNT); - return 0; -}; -__initcall(io_uring_init); diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index 71942a1c642d4..c99710b3027a0 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -207,12 +207,16 @@ extern void tlb_remove_table(struct mmu_gather *tlb, void *table); #define tlb_needs_table_invalidate() (true) #endif +void tlb_remove_table_sync_one(void); + #else #ifdef tlb_needs_table_invalidate #error tlb_needs_table_invalidate() requires MMU_GATHER_RCU_TABLE_FREE #endif +static inline void tlb_remove_table_sync_one(void) { } + #endif /* CONFIG_MMU_GATHER_RCU_TABLE_FREE */ diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 75c151413fda8..45cdb12243e3f 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -68,6 +68,7 @@ struct css_task_iter { struct list_head iters_node; /* css_set->task_iters */ }; +extern struct file_system_type cgroup_fs_type; extern struct cgroup_root cgrp_dfl_root; extern struct css_set init_css_set; diff --git a/include/linux/clk.h b/include/linux/clk.h index 266e8de3cb515..e280e0acb55c6 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -458,6 +458,47 @@ int __must_check devm_clk_bulk_get_all(struct device *dev, */ struct clk *devm_clk_get(struct device *dev, const char *id); +/** + * devm_clk_get_prepared - devm_clk_get() + clk_prepare() + * @dev: device for clock "consumer" + * @id: clock consumer ID + * + * Context: May sleep. + * + * Return: a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. (IOW, @id may be identical strings, but + * clk_get may return different clock producers depending on @dev.) + * + * The returned clk (if valid) is prepared. Drivers must however assume + * that the clock is not enabled. + * + * The clock will automatically be unprepared and freed when the device + * is unbound from the bus. + */ +struct clk *devm_clk_get_prepared(struct device *dev, const char *id); + +/** + * devm_clk_get_enabled - devm_clk_get() + clk_prepare_enable() + * @dev: device for clock "consumer" + * @id: clock consumer ID + * + * Context: May sleep. + * + * Return: a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. (IOW, @id may be identical strings, but + * clk_get may return different clock producers depending on @dev.) + * + * The returned clk (if valid) is prepared and enabled. + * + * The clock will automatically be disabled, unprepared and freed + * when the device is unbound from the bus. + */ +struct clk *devm_clk_get_enabled(struct device *dev, const char *id); + /** * devm_clk_get_optional - lookup and obtain a managed reference to an optional * clock producer. @@ -469,6 +510,50 @@ struct clk *devm_clk_get(struct device *dev, const char *id); */ struct clk *devm_clk_get_optional(struct device *dev, const char *id); +/** + * devm_clk_get_optional_prepared - devm_clk_get_optional() + clk_prepare() + * @dev: device for clock "consumer" + * @id: clock consumer ID + * + * Context: May sleep. + * + * Return: a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. If no such clk is found, it returns NULL + * which serves as a dummy clk. That's the only difference compared + * to devm_clk_get_prepared(). + * + * The returned clk (if valid) is prepared. Drivers must however + * assume that the clock is not enabled. + * + * The clock will automatically be unprepared and freed when the + * device is unbound from the bus. + */ +struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id); + +/** + * devm_clk_get_optional_enabled - devm_clk_get_optional() + + * clk_prepare_enable() + * @dev: device for clock "consumer" + * @id: clock consumer ID + * + * Context: May sleep. + * + * Return: a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. If no such clk is found, it returns NULL + * which serves as a dummy clk. That's the only difference compared + * to devm_clk_get_enabled(). + * + * The returned clk (if valid) is prepared and enabled. + * + * The clock will automatically be disabled, unprepared and freed + * when the device is unbound from the bus. + */ +struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id); + /** * devm_get_clk_from_child - lookup and obtain a managed reference to a * clock producer from child node. @@ -813,12 +898,36 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id) return NULL; } +static inline struct clk *devm_clk_get_prepared(struct device *dev, + const char *id) +{ + return NULL; +} + +static inline struct clk *devm_clk_get_enabled(struct device *dev, + const char *id) +{ + return NULL; +} + static inline struct clk *devm_clk_get_optional(struct device *dev, const char *id) { return NULL; } +static inline struct clk *devm_clk_get_optional_prepared(struct device *dev, + const char *id) +{ + return NULL; +} + +static inline struct clk *devm_clk_get_optional_enabled(struct device *dev, + const char *id) +{ + return NULL; +} + static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, struct clk_bulk_data *clks) { diff --git a/include/linux/mc146818rtc.h b/include/linux/mc146818rtc.h index 3038124c61154..b0da04fe087bb 100644 --- a/include/linux/mc146818rtc.h +++ b/include/linux/mc146818rtc.h @@ -129,4 +129,7 @@ bool mc146818_does_rtc_work(void); int mc146818_get_time(struct rtc_time *time); int mc146818_set_time(struct rtc_time *time); +bool mc146818_avoid_UIP(void (*callback)(unsigned char seconds, void *param), + void *param); + #endif /* _MC146818RTC_H */ diff --git a/io_uring/Makefile b/io_uring/Makefile new file mode 100644 index 0000000000000..3680425df9478 --- /dev/null +++ b/io_uring/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for io_uring + +obj-$(CONFIG_IO_URING) += io_uring.o +obj-$(CONFIG_IO_WQ) += io-wq.o diff --git a/io_uring/io-wq.c b/io_uring/io-wq.c new file mode 100644 index 0000000000000..6031fb319d878 --- /dev/null +++ b/io_uring/io-wq.c @@ -0,0 +1,1398 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Basic worker thread pool for io_uring + * + * Copyright (C) 2019 Jens Axboe + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "io-wq.h" + +#define WORKER_IDLE_TIMEOUT (5 * HZ) + +enum { + IO_WORKER_F_UP = 1, /* up and active */ + IO_WORKER_F_RUNNING = 2, /* account as running */ + IO_WORKER_F_FREE = 4, /* worker on free list */ + IO_WORKER_F_BOUND = 8, /* is doing bounded work */ +}; + +enum { + IO_WQ_BIT_EXIT = 0, /* wq exiting */ +}; + +enum { + IO_ACCT_STALLED_BIT = 0, /* stalled on hash */ +}; + +/* + * One for each thread in a wqe pool + */ +struct io_worker { + refcount_t ref; + unsigned flags; + struct hlist_nulls_node nulls_node; + struct list_head all_list; + struct task_struct *task; + struct io_wqe *wqe; + + struct io_wq_work *cur_work; + spinlock_t lock; + + struct completion ref_done; + + unsigned long create_state; + struct callback_head create_work; + int create_index; + + union { + struct rcu_head rcu; + struct work_struct work; + }; +}; + +#if BITS_PER_LONG == 64 +#define IO_WQ_HASH_ORDER 6 +#else +#define IO_WQ_HASH_ORDER 5 +#endif + +#define IO_WQ_NR_HASH_BUCKETS (1u << IO_WQ_HASH_ORDER) + +struct io_wqe_acct { + unsigned nr_workers; + unsigned max_workers; + int index; + atomic_t nr_running; + struct io_wq_work_list work_list; + unsigned long flags; +}; + +enum { + IO_WQ_ACCT_BOUND, + IO_WQ_ACCT_UNBOUND, + IO_WQ_ACCT_NR, +}; + +/* + * Per-node worker thread pool + */ +struct io_wqe { + raw_spinlock_t lock; + struct io_wqe_acct acct[2]; + + int node; + + struct hlist_nulls_head free_list; + struct list_head all_list; + + struct wait_queue_entry wait; + + struct io_wq *wq; + struct io_wq_work *hash_tail[IO_WQ_NR_HASH_BUCKETS]; + + cpumask_var_t cpu_mask; +}; + +/* + * Per io_wq state + */ +struct io_wq { + unsigned long state; + + free_work_fn *free_work; + io_wq_work_fn *do_work; + + struct io_wq_hash *hash; + + atomic_t worker_refs; + struct completion worker_done; + + struct hlist_node cpuhp_node; + + struct task_struct *task; + + struct io_wqe *wqes[]; +}; + +static enum cpuhp_state io_wq_online; + +struct io_cb_cancel_data { + work_cancel_fn *fn; + void *data; + int nr_running; + int nr_pending; + bool cancel_all; +}; + +static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index); +static void io_wqe_dec_running(struct io_worker *worker); +static bool io_acct_cancel_pending_work(struct io_wqe *wqe, + struct io_wqe_acct *acct, + struct io_cb_cancel_data *match); +static void create_worker_cb(struct callback_head *cb); +static void io_wq_cancel_tw_create(struct io_wq *wq); + +static bool io_worker_get(struct io_worker *worker) +{ + return refcount_inc_not_zero(&worker->ref); +} + +static void io_worker_release(struct io_worker *worker) +{ + if (refcount_dec_and_test(&worker->ref)) + complete(&worker->ref_done); +} + +static inline struct io_wqe_acct *io_get_acct(struct io_wqe *wqe, bool bound) +{ + return &wqe->acct[bound ? IO_WQ_ACCT_BOUND : IO_WQ_ACCT_UNBOUND]; +} + +static inline struct io_wqe_acct *io_work_get_acct(struct io_wqe *wqe, + struct io_wq_work *work) +{ + return io_get_acct(wqe, !(work->flags & IO_WQ_WORK_UNBOUND)); +} + +static inline struct io_wqe_acct *io_wqe_get_acct(struct io_worker *worker) +{ + return io_get_acct(worker->wqe, worker->flags & IO_WORKER_F_BOUND); +} + +static void io_worker_ref_put(struct io_wq *wq) +{ + if (atomic_dec_and_test(&wq->worker_refs)) + complete(&wq->worker_done); +} + +static void io_worker_cancel_cb(struct io_worker *worker) +{ + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + struct io_wqe *wqe = worker->wqe; + struct io_wq *wq = wqe->wq; + + atomic_dec(&acct->nr_running); + raw_spin_lock(&worker->wqe->lock); + acct->nr_workers--; + raw_spin_unlock(&worker->wqe->lock); + io_worker_ref_put(wq); + clear_bit_unlock(0, &worker->create_state); + io_worker_release(worker); +} + +static bool io_task_worker_match(struct callback_head *cb, void *data) +{ + struct io_worker *worker; + + if (cb->func != create_worker_cb) + return false; + worker = container_of(cb, struct io_worker, create_work); + return worker == data; +} + +static void io_worker_exit(struct io_worker *worker) +{ + struct io_wqe *wqe = worker->wqe; + struct io_wq *wq = wqe->wq; + + while (1) { + struct callback_head *cb = task_work_cancel_match(wq->task, + io_task_worker_match, worker); + + if (!cb) + break; + io_worker_cancel_cb(worker); + } + + if (refcount_dec_and_test(&worker->ref)) + complete(&worker->ref_done); + wait_for_completion(&worker->ref_done); + + raw_spin_lock(&wqe->lock); + if (worker->flags & IO_WORKER_F_FREE) + hlist_nulls_del_rcu(&worker->nulls_node); + list_del_rcu(&worker->all_list); + preempt_disable(); + io_wqe_dec_running(worker); + worker->flags = 0; + current->flags &= ~PF_IO_WORKER; + preempt_enable(); + raw_spin_unlock(&wqe->lock); + + kfree_rcu(worker, rcu); + io_worker_ref_put(wqe->wq); + do_exit(0); +} + +static inline bool io_acct_run_queue(struct io_wqe_acct *acct) +{ + if (!wq_list_empty(&acct->work_list) && + !test_bit(IO_ACCT_STALLED_BIT, &acct->flags)) + return true; + return false; +} + +/* + * Check head of free list for an available worker. If one isn't available, + * caller must create one. + */ +static bool io_wqe_activate_free_worker(struct io_wqe *wqe, + struct io_wqe_acct *acct) + __must_hold(RCU) +{ + struct hlist_nulls_node *n; + struct io_worker *worker; + + /* + * Iterate free_list and see if we can find an idle worker to + * activate. If a given worker is on the free_list but in the process + * of exiting, keep trying. + */ + hlist_nulls_for_each_entry_rcu(worker, n, &wqe->free_list, nulls_node) { + if (!io_worker_get(worker)) + continue; + if (io_wqe_get_acct(worker) != acct) { + io_worker_release(worker); + continue; + } + if (wake_up_process(worker->task)) { + io_worker_release(worker); + return true; + } + io_worker_release(worker); + } + + return false; +} + +/* + * We need a worker. If we find a free one, we're good. If not, and we're + * below the max number of workers, create one. + */ +static bool io_wqe_create_worker(struct io_wqe *wqe, struct io_wqe_acct *acct) +{ + /* + * Most likely an attempt to queue unbounded work on an io_wq that + * wasn't setup with any unbounded workers. + */ + if (unlikely(!acct->max_workers)) + pr_warn_once("io-wq is not configured for unbound workers"); + + raw_spin_lock(&wqe->lock); + if (acct->nr_workers >= acct->max_workers) { + raw_spin_unlock(&wqe->lock); + return true; + } + acct->nr_workers++; + raw_spin_unlock(&wqe->lock); + atomic_inc(&acct->nr_running); + atomic_inc(&wqe->wq->worker_refs); + return create_io_worker(wqe->wq, wqe, acct->index); +} + +static void io_wqe_inc_running(struct io_worker *worker) +{ + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + + atomic_inc(&acct->nr_running); +} + +static void create_worker_cb(struct callback_head *cb) +{ + struct io_worker *worker; + struct io_wq *wq; + struct io_wqe *wqe; + struct io_wqe_acct *acct; + bool do_create = false; + + worker = container_of(cb, struct io_worker, create_work); + wqe = worker->wqe; + wq = wqe->wq; + acct = &wqe->acct[worker->create_index]; + raw_spin_lock(&wqe->lock); + if (acct->nr_workers < acct->max_workers) { + acct->nr_workers++; + do_create = true; + } + raw_spin_unlock(&wqe->lock); + if (do_create) { + create_io_worker(wq, wqe, worker->create_index); + } else { + atomic_dec(&acct->nr_running); + io_worker_ref_put(wq); + } + clear_bit_unlock(0, &worker->create_state); + io_worker_release(worker); +} + +static bool io_queue_worker_create(struct io_worker *worker, + struct io_wqe_acct *acct, + task_work_func_t func) +{ + struct io_wqe *wqe = worker->wqe; + struct io_wq *wq = wqe->wq; + + /* raced with exit, just ignore create call */ + if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) + goto fail; + if (!io_worker_get(worker)) + goto fail; + /* + * create_state manages ownership of create_work/index. We should + * only need one entry per worker, as the worker going to sleep + * will trigger the condition, and waking will clear it once it + * runs the task_work. + */ + if (test_bit(0, &worker->create_state) || + test_and_set_bit_lock(0, &worker->create_state)) + goto fail_release; + + atomic_inc(&wq->worker_refs); + init_task_work(&worker->create_work, func); + worker->create_index = acct->index; + if (!task_work_add(wq->task, &worker->create_work, TWA_SIGNAL)) { + /* + * EXIT may have been set after checking it above, check after + * adding the task_work and remove any creation item if it is + * now set. wq exit does that too, but we can have added this + * work item after we canceled in io_wq_exit_workers(). + */ + if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) + io_wq_cancel_tw_create(wq); + io_worker_ref_put(wq); + return true; + } + io_worker_ref_put(wq); + clear_bit_unlock(0, &worker->create_state); +fail_release: + io_worker_release(worker); +fail: + atomic_dec(&acct->nr_running); + io_worker_ref_put(wq); + return false; +} + +static void io_wqe_dec_running(struct io_worker *worker) + __must_hold(wqe->lock) +{ + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + struct io_wqe *wqe = worker->wqe; + + if (!(worker->flags & IO_WORKER_F_UP)) + return; + + if (atomic_dec_and_test(&acct->nr_running) && io_acct_run_queue(acct)) { + atomic_inc(&acct->nr_running); + atomic_inc(&wqe->wq->worker_refs); + raw_spin_unlock(&wqe->lock); + io_queue_worker_create(worker, acct, create_worker_cb); + raw_spin_lock(&wqe->lock); + } +} + +/* + * Worker will start processing some work. Move it to the busy list, if + * it's currently on the freelist + */ +static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, + struct io_wq_work *work) + __must_hold(wqe->lock) +{ + if (worker->flags & IO_WORKER_F_FREE) { + worker->flags &= ~IO_WORKER_F_FREE; + hlist_nulls_del_init_rcu(&worker->nulls_node); + } +} + +/* + * No work, worker going to sleep. Move to freelist, and unuse mm if we + * have one attached. Dropping the mm may potentially sleep, so we drop + * the lock in that case and return success. Since the caller has to + * retry the loop in that case (we changed task state), we don't regrab + * the lock if we return success. + */ +static void __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker) + __must_hold(wqe->lock) +{ + if (!(worker->flags & IO_WORKER_F_FREE)) { + worker->flags |= IO_WORKER_F_FREE; + hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); + } +} + +static inline unsigned int io_get_work_hash(struct io_wq_work *work) +{ + return work->flags >> IO_WQ_HASH_SHIFT; +} + +static bool io_wait_on_hash(struct io_wqe *wqe, unsigned int hash) +{ + struct io_wq *wq = wqe->wq; + bool ret = false; + + spin_lock_irq(&wq->hash->wait.lock); + if (list_empty(&wqe->wait.entry)) { + __add_wait_queue(&wq->hash->wait, &wqe->wait); + if (!test_bit(hash, &wq->hash->map)) { + __set_current_state(TASK_RUNNING); + list_del_init(&wqe->wait.entry); + ret = true; + } + } + spin_unlock_irq(&wq->hash->wait.lock); + return ret; +} + +static struct io_wq_work *io_get_next_work(struct io_wqe_acct *acct, + struct io_worker *worker) + __must_hold(wqe->lock) +{ + struct io_wq_work_node *node, *prev; + struct io_wq_work *work, *tail; + unsigned int stall_hash = -1U; + struct io_wqe *wqe = worker->wqe; + + wq_list_for_each(node, prev, &acct->work_list) { + unsigned int hash; + + work = container_of(node, struct io_wq_work, list); + + /* not hashed, can run anytime */ + if (!io_wq_is_hashed(work)) { + wq_list_del(&acct->work_list, node, prev); + return work; + } + + hash = io_get_work_hash(work); + /* all items with this hash lie in [work, tail] */ + tail = wqe->hash_tail[hash]; + + /* hashed, can run if not already running */ + if (!test_and_set_bit(hash, &wqe->wq->hash->map)) { + wqe->hash_tail[hash] = NULL; + wq_list_cut(&acct->work_list, &tail->list, prev); + return work; + } + if (stall_hash == -1U) + stall_hash = hash; + /* fast forward to a next hash, for-each will fix up @prev */ + node = &tail->list; + } + + if (stall_hash != -1U) { + bool unstalled; + + /* + * Set this before dropping the lock to avoid racing with new + * work being added and clearing the stalled bit. + */ + set_bit(IO_ACCT_STALLED_BIT, &acct->flags); + raw_spin_unlock(&wqe->lock); + unstalled = io_wait_on_hash(wqe, stall_hash); + raw_spin_lock(&wqe->lock); + if (unstalled) { + clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); + if (wq_has_sleeper(&wqe->wq->hash->wait)) + wake_up(&wqe->wq->hash->wait); + } + } + + return NULL; +} + +static bool io_flush_signals(void) +{ + if (unlikely(test_thread_flag(TIF_NOTIFY_SIGNAL))) { + __set_current_state(TASK_RUNNING); + tracehook_notify_signal(); + return true; + } + return false; +} + +static void io_assign_current_work(struct io_worker *worker, + struct io_wq_work *work) +{ + if (work) { + io_flush_signals(); + cond_resched(); + } + + spin_lock(&worker->lock); + worker->cur_work = work; + spin_unlock(&worker->lock); +} + +static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work); + +static void io_worker_handle_work(struct io_worker *worker) + __releases(wqe->lock) +{ + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + struct io_wqe *wqe = worker->wqe; + struct io_wq *wq = wqe->wq; + bool do_kill = test_bit(IO_WQ_BIT_EXIT, &wq->state); + + do { + struct io_wq_work *work; +get_next: + /* + * If we got some work, mark us as busy. If we didn't, but + * the list isn't empty, it means we stalled on hashed work. + * Mark us stalled so we don't keep looking for work when we + * can't make progress, any work completion or insertion will + * clear the stalled flag. + */ + work = io_get_next_work(acct, worker); + if (work) + __io_worker_busy(wqe, worker, work); + + raw_spin_unlock(&wqe->lock); + if (!work) + break; + io_assign_current_work(worker, work); + __set_current_state(TASK_RUNNING); + + /* handle a whole dependent link */ + do { + struct io_wq_work *next_hashed, *linked; + unsigned int hash = io_get_work_hash(work); + + next_hashed = wq_next_work(work); + + if (unlikely(do_kill) && (work->flags & IO_WQ_WORK_UNBOUND)) + work->flags |= IO_WQ_WORK_CANCEL; + wq->do_work(work); + io_assign_current_work(worker, NULL); + + linked = wq->free_work(work); + work = next_hashed; + if (!work && linked && !io_wq_is_hashed(linked)) { + work = linked; + linked = NULL; + } + io_assign_current_work(worker, work); + if (linked) + io_wqe_enqueue(wqe, linked); + + if (hash != -1U && !next_hashed) { + /* serialize hash clear with wake_up() */ + spin_lock_irq(&wq->hash->wait.lock); + clear_bit(hash, &wq->hash->map); + clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); + spin_unlock_irq(&wq->hash->wait.lock); + if (wq_has_sleeper(&wq->hash->wait)) + wake_up(&wq->hash->wait); + raw_spin_lock(&wqe->lock); + /* skip unnecessary unlock-lock wqe->lock */ + if (!work) + goto get_next; + raw_spin_unlock(&wqe->lock); + } + } while (work); + + raw_spin_lock(&wqe->lock); + } while (1); +} + +static int io_wqe_worker(void *data) +{ + struct io_worker *worker = data; + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + struct io_wqe *wqe = worker->wqe; + struct io_wq *wq = wqe->wq; + bool last_timeout = false; + char buf[TASK_COMM_LEN]; + + worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING); + + snprintf(buf, sizeof(buf), "iou-wrk-%d", wq->task->pid); + set_task_comm(current, buf); + + while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) { + long ret; + + set_current_state(TASK_INTERRUPTIBLE); +loop: + raw_spin_lock(&wqe->lock); + if (io_acct_run_queue(acct)) { + io_worker_handle_work(worker); + goto loop; + } + /* timed out, exit unless we're the last worker */ + if (last_timeout && acct->nr_workers > 1) { + acct->nr_workers--; + raw_spin_unlock(&wqe->lock); + __set_current_state(TASK_RUNNING); + break; + } + last_timeout = false; + __io_worker_idle(wqe, worker); + raw_spin_unlock(&wqe->lock); + if (io_flush_signals()) + continue; + ret = schedule_timeout(WORKER_IDLE_TIMEOUT); + if (signal_pending(current)) { + struct ksignal ksig; + + if (!get_signal(&ksig)) + continue; + break; + } + last_timeout = !ret; + } + + if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) { + raw_spin_lock(&wqe->lock); + io_worker_handle_work(worker); + } + + io_worker_exit(worker); + return 0; +} + +/* + * Called when a worker is scheduled in. Mark us as currently running. + */ +void io_wq_worker_running(struct task_struct *tsk) +{ + struct io_worker *worker = tsk->pf_io_worker; + + if (!worker) + return; + if (!(worker->flags & IO_WORKER_F_UP)) + return; + if (worker->flags & IO_WORKER_F_RUNNING) + return; + worker->flags |= IO_WORKER_F_RUNNING; + io_wqe_inc_running(worker); +} + +/* + * Called when worker is going to sleep. If there are no workers currently + * running and we have work pending, wake up a free one or create a new one. + */ +void io_wq_worker_sleeping(struct task_struct *tsk) +{ + struct io_worker *worker = tsk->pf_io_worker; + + if (!worker) + return; + if (!(worker->flags & IO_WORKER_F_UP)) + return; + if (!(worker->flags & IO_WORKER_F_RUNNING)) + return; + + worker->flags &= ~IO_WORKER_F_RUNNING; + + raw_spin_lock(&worker->wqe->lock); + io_wqe_dec_running(worker); + raw_spin_unlock(&worker->wqe->lock); +} + +static void io_init_new_worker(struct io_wqe *wqe, struct io_worker *worker, + struct task_struct *tsk) +{ + tsk->pf_io_worker = worker; + worker->task = tsk; + set_cpus_allowed_ptr(tsk, wqe->cpu_mask); + tsk->flags |= PF_NO_SETAFFINITY; + + raw_spin_lock(&wqe->lock); + hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); + list_add_tail_rcu(&worker->all_list, &wqe->all_list); + worker->flags |= IO_WORKER_F_FREE; + raw_spin_unlock(&wqe->lock); + wake_up_new_task(tsk); +} + +static bool io_wq_work_match_all(struct io_wq_work *work, void *data) +{ + return true; +} + +static inline bool io_should_retry_thread(long err) +{ + /* + * Prevent perpetual task_work retry, if the task (or its group) is + * exiting. + */ + if (fatal_signal_pending(current)) + return false; + + switch (err) { + case -EAGAIN: + case -ERESTARTSYS: + case -ERESTARTNOINTR: + case -ERESTARTNOHAND: + return true; + default: + return false; + } +} + +static void create_worker_cont(struct callback_head *cb) +{ + struct io_worker *worker; + struct task_struct *tsk; + struct io_wqe *wqe; + + worker = container_of(cb, struct io_worker, create_work); + clear_bit_unlock(0, &worker->create_state); + wqe = worker->wqe; + tsk = create_io_thread(io_wqe_worker, worker, wqe->node); + if (!IS_ERR(tsk)) { + io_init_new_worker(wqe, worker, tsk); + io_worker_release(worker); + return; + } else if (!io_should_retry_thread(PTR_ERR(tsk))) { + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + + atomic_dec(&acct->nr_running); + raw_spin_lock(&wqe->lock); + acct->nr_workers--; + if (!acct->nr_workers) { + struct io_cb_cancel_data match = { + .fn = io_wq_work_match_all, + .cancel_all = true, + }; + + while (io_acct_cancel_pending_work(wqe, acct, &match)) + raw_spin_lock(&wqe->lock); + } + raw_spin_unlock(&wqe->lock); + io_worker_ref_put(wqe->wq); + kfree(worker); + return; + } + + /* re-create attempts grab a new worker ref, drop the existing one */ + io_worker_release(worker); + schedule_work(&worker->work); +} + +static void io_workqueue_create(struct work_struct *work) +{ + struct io_worker *worker = container_of(work, struct io_worker, work); + struct io_wqe_acct *acct = io_wqe_get_acct(worker); + + if (!io_queue_worker_create(worker, acct, create_worker_cont)) + kfree(worker); +} + +static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index) +{ + struct io_wqe_acct *acct = &wqe->acct[index]; + struct io_worker *worker; + struct task_struct *tsk; + + __set_current_state(TASK_RUNNING); + + worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node); + if (!worker) { +fail: + atomic_dec(&acct->nr_running); + raw_spin_lock(&wqe->lock); + acct->nr_workers--; + raw_spin_unlock(&wqe->lock); + io_worker_ref_put(wq); + return false; + } + + refcount_set(&worker->ref, 1); + worker->wqe = wqe; + spin_lock_init(&worker->lock); + init_completion(&worker->ref_done); + + if (index == IO_WQ_ACCT_BOUND) + worker->flags |= IO_WORKER_F_BOUND; + + tsk = create_io_thread(io_wqe_worker, worker, wqe->node); + if (!IS_ERR(tsk)) { + io_init_new_worker(wqe, worker, tsk); + } else if (!io_should_retry_thread(PTR_ERR(tsk))) { + kfree(worker); + goto fail; + } else { + INIT_WORK(&worker->work, io_workqueue_create); + schedule_work(&worker->work); + } + + return true; +} + +/* + * Iterate the passed in list and call the specific function for each + * worker that isn't exiting + */ +static bool io_wq_for_each_worker(struct io_wqe *wqe, + bool (*func)(struct io_worker *, void *), + void *data) +{ + struct io_worker *worker; + bool ret = false; + + list_for_each_entry_rcu(worker, &wqe->all_list, all_list) { + if (io_worker_get(worker)) { + /* no task if node is/was offline */ + if (worker->task) + ret = func(worker, data); + io_worker_release(worker); + if (ret) + break; + } + } + + return ret; +} + +static bool io_wq_worker_wake(struct io_worker *worker, void *data) +{ + set_notify_signal(worker->task); + wake_up_process(worker->task); + return false; +} + +static void io_run_cancel(struct io_wq_work *work, struct io_wqe *wqe) +{ + struct io_wq *wq = wqe->wq; + + do { + work->flags |= IO_WQ_WORK_CANCEL; + wq->do_work(work); + work = wq->free_work(work); + } while (work); +} + +static void io_wqe_insert_work(struct io_wqe *wqe, struct io_wq_work *work) +{ + struct io_wqe_acct *acct = io_work_get_acct(wqe, work); + unsigned int hash; + struct io_wq_work *tail; + + if (!io_wq_is_hashed(work)) { +append: + wq_list_add_tail(&work->list, &acct->work_list); + return; + } + + hash = io_get_work_hash(work); + tail = wqe->hash_tail[hash]; + wqe->hash_tail[hash] = work; + if (!tail) + goto append; + + wq_list_add_after(&work->list, &tail->list, &acct->work_list); +} + +static bool io_wq_work_match_item(struct io_wq_work *work, void *data) +{ + return work == data; +} + +static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work) +{ + struct io_wqe_acct *acct = io_work_get_acct(wqe, work); + unsigned work_flags = work->flags; + bool do_create; + + /* + * If io-wq is exiting for this task, or if the request has explicitly + * been marked as one that should not get executed, cancel it here. + */ + if (test_bit(IO_WQ_BIT_EXIT, &wqe->wq->state) || + (work->flags & IO_WQ_WORK_CANCEL)) { + io_run_cancel(work, wqe); + return; + } + + raw_spin_lock(&wqe->lock); + io_wqe_insert_work(wqe, work); + clear_bit(IO_ACCT_STALLED_BIT, &acct->flags); + + rcu_read_lock(); + do_create = !io_wqe_activate_free_worker(wqe, acct); + rcu_read_unlock(); + + raw_spin_unlock(&wqe->lock); + + if (do_create && ((work_flags & IO_WQ_WORK_CONCURRENT) || + !atomic_read(&acct->nr_running))) { + bool did_create; + + did_create = io_wqe_create_worker(wqe, acct); + if (likely(did_create)) + return; + + raw_spin_lock(&wqe->lock); + /* fatal condition, failed to create the first worker */ + if (!acct->nr_workers) { + struct io_cb_cancel_data match = { + .fn = io_wq_work_match_item, + .data = work, + .cancel_all = false, + }; + + if (io_acct_cancel_pending_work(wqe, acct, &match)) + raw_spin_lock(&wqe->lock); + } + raw_spin_unlock(&wqe->lock); + } +} + +void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work) +{ + struct io_wqe *wqe = wq->wqes[numa_node_id()]; + + io_wqe_enqueue(wqe, work); +} + +/* + * Work items that hash to the same value will not be done in parallel. + * Used to limit concurrent writes, generally hashed by inode. + */ +void io_wq_hash_work(struct io_wq_work *work, void *val) +{ + unsigned int bit; + + bit = hash_ptr(val, IO_WQ_HASH_ORDER); + work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT)); +} + +static bool io_wq_worker_cancel(struct io_worker *worker, void *data) +{ + struct io_cb_cancel_data *match = data; + + /* + * Hold the lock to avoid ->cur_work going out of scope, caller + * may dereference the passed in work. + */ + spin_lock(&worker->lock); + if (worker->cur_work && + match->fn(worker->cur_work, match->data)) { + set_notify_signal(worker->task); + match->nr_running++; + } + spin_unlock(&worker->lock); + + return match->nr_running && !match->cancel_all; +} + +static inline void io_wqe_remove_pending(struct io_wqe *wqe, + struct io_wq_work *work, + struct io_wq_work_node *prev) +{ + struct io_wqe_acct *acct = io_work_get_acct(wqe, work); + unsigned int hash = io_get_work_hash(work); + struct io_wq_work *prev_work = NULL; + + if (io_wq_is_hashed(work) && work == wqe->hash_tail[hash]) { + if (prev) + prev_work = container_of(prev, struct io_wq_work, list); + if (prev_work && io_get_work_hash(prev_work) == hash) + wqe->hash_tail[hash] = prev_work; + else + wqe->hash_tail[hash] = NULL; + } + wq_list_del(&acct->work_list, &work->list, prev); +} + +static bool io_acct_cancel_pending_work(struct io_wqe *wqe, + struct io_wqe_acct *acct, + struct io_cb_cancel_data *match) + __releases(wqe->lock) +{ + struct io_wq_work_node *node, *prev; + struct io_wq_work *work; + + wq_list_for_each(node, prev, &acct->work_list) { + work = container_of(node, struct io_wq_work, list); + if (!match->fn(work, match->data)) + continue; + io_wqe_remove_pending(wqe, work, prev); + raw_spin_unlock(&wqe->lock); + io_run_cancel(work, wqe); + match->nr_pending++; + /* not safe to continue after unlock */ + return true; + } + + return false; +} + +static void io_wqe_cancel_pending_work(struct io_wqe *wqe, + struct io_cb_cancel_data *match) +{ + int i; +retry: + raw_spin_lock(&wqe->lock); + for (i = 0; i < IO_WQ_ACCT_NR; i++) { + struct io_wqe_acct *acct = io_get_acct(wqe, i == 0); + + if (io_acct_cancel_pending_work(wqe, acct, match)) { + if (match->cancel_all) + goto retry; + return; + } + } + raw_spin_unlock(&wqe->lock); +} + +static void io_wqe_cancel_running_work(struct io_wqe *wqe, + struct io_cb_cancel_data *match) +{ + rcu_read_lock(); + io_wq_for_each_worker(wqe, io_wq_worker_cancel, match); + rcu_read_unlock(); +} + +enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, + void *data, bool cancel_all) +{ + struct io_cb_cancel_data match = { + .fn = cancel, + .data = data, + .cancel_all = cancel_all, + }; + int node; + + /* + * First check pending list, if we're lucky we can just remove it + * from there. CANCEL_OK means that the work is returned as-new, + * no completion will be posted for it. + */ + for_each_node(node) { + struct io_wqe *wqe = wq->wqes[node]; + + io_wqe_cancel_pending_work(wqe, &match); + if (match.nr_pending && !match.cancel_all) + return IO_WQ_CANCEL_OK; + } + + /* + * Now check if a free (going busy) or busy worker has the work + * currently running. If we find it there, we'll return CANCEL_RUNNING + * as an indication that we attempt to signal cancellation. The + * completion will run normally in this case. + */ + for_each_node(node) { + struct io_wqe *wqe = wq->wqes[node]; + + io_wqe_cancel_running_work(wqe, &match); + if (match.nr_running && !match.cancel_all) + return IO_WQ_CANCEL_RUNNING; + } + + if (match.nr_running) + return IO_WQ_CANCEL_RUNNING; + if (match.nr_pending) + return IO_WQ_CANCEL_OK; + return IO_WQ_CANCEL_NOTFOUND; +} + +static int io_wqe_hash_wake(struct wait_queue_entry *wait, unsigned mode, + int sync, void *key) +{ + struct io_wqe *wqe = container_of(wait, struct io_wqe, wait); + int i; + + list_del_init(&wait->entry); + + rcu_read_lock(); + for (i = 0; i < IO_WQ_ACCT_NR; i++) { + struct io_wqe_acct *acct = &wqe->acct[i]; + + if (test_and_clear_bit(IO_ACCT_STALLED_BIT, &acct->flags)) + io_wqe_activate_free_worker(wqe, acct); + } + rcu_read_unlock(); + return 1; +} + +struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) +{ + int ret, node, i; + struct io_wq *wq; + + if (WARN_ON_ONCE(!data->free_work || !data->do_work)) + return ERR_PTR(-EINVAL); + if (WARN_ON_ONCE(!bounded)) + return ERR_PTR(-EINVAL); + + wq = kzalloc(struct_size(wq, wqes, nr_node_ids), GFP_KERNEL); + if (!wq) + return ERR_PTR(-ENOMEM); + ret = cpuhp_state_add_instance_nocalls(io_wq_online, &wq->cpuhp_node); + if (ret) + goto err_wq; + + refcount_inc(&data->hash->refs); + wq->hash = data->hash; + wq->free_work = data->free_work; + wq->do_work = data->do_work; + + ret = -ENOMEM; + for_each_node(node) { + struct io_wqe *wqe; + int alloc_node = node; + + if (!node_online(alloc_node)) + alloc_node = NUMA_NO_NODE; + wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node); + if (!wqe) + goto err; + wq->wqes[node] = wqe; + if (!alloc_cpumask_var(&wqe->cpu_mask, GFP_KERNEL)) + goto err; + cpumask_copy(wqe->cpu_mask, cpumask_of_node(node)); + wqe->node = alloc_node; + wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded; + wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers = + task_rlimit(current, RLIMIT_NPROC); + INIT_LIST_HEAD(&wqe->wait.entry); + wqe->wait.func = io_wqe_hash_wake; + for (i = 0; i < IO_WQ_ACCT_NR; i++) { + struct io_wqe_acct *acct = &wqe->acct[i]; + + acct->index = i; + atomic_set(&acct->nr_running, 0); + INIT_WQ_LIST(&acct->work_list); + } + wqe->wq = wq; + raw_spin_lock_init(&wqe->lock); + INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0); + INIT_LIST_HEAD(&wqe->all_list); + } + + wq->task = get_task_struct(data->task); + atomic_set(&wq->worker_refs, 1); + init_completion(&wq->worker_done); + return wq; +err: + io_wq_put_hash(data->hash); + cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node); + for_each_node(node) { + if (!wq->wqes[node]) + continue; + free_cpumask_var(wq->wqes[node]->cpu_mask); + kfree(wq->wqes[node]); + } +err_wq: + kfree(wq); + return ERR_PTR(ret); +} + +static bool io_task_work_match(struct callback_head *cb, void *data) +{ + struct io_worker *worker; + + if (cb->func != create_worker_cb && cb->func != create_worker_cont) + return false; + worker = container_of(cb, struct io_worker, create_work); + return worker->wqe->wq == data; +} + +void io_wq_exit_start(struct io_wq *wq) +{ + set_bit(IO_WQ_BIT_EXIT, &wq->state); +} + +static void io_wq_cancel_tw_create(struct io_wq *wq) +{ + struct callback_head *cb; + + while ((cb = task_work_cancel_match(wq->task, io_task_work_match, wq)) != NULL) { + struct io_worker *worker; + + worker = container_of(cb, struct io_worker, create_work); + io_worker_cancel_cb(worker); + } +} + +static void io_wq_exit_workers(struct io_wq *wq) +{ + int node; + + if (!wq->task) + return; + + io_wq_cancel_tw_create(wq); + + rcu_read_lock(); + for_each_node(node) { + struct io_wqe *wqe = wq->wqes[node]; + + io_wq_for_each_worker(wqe, io_wq_worker_wake, NULL); + } + rcu_read_unlock(); + io_worker_ref_put(wq); + wait_for_completion(&wq->worker_done); + + for_each_node(node) { + spin_lock_irq(&wq->hash->wait.lock); + list_del_init(&wq->wqes[node]->wait.entry); + spin_unlock_irq(&wq->hash->wait.lock); + } + put_task_struct(wq->task); + wq->task = NULL; +} + +static void io_wq_destroy(struct io_wq *wq) +{ + int node; + + cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node); + + for_each_node(node) { + struct io_wqe *wqe = wq->wqes[node]; + struct io_cb_cancel_data match = { + .fn = io_wq_work_match_all, + .cancel_all = true, + }; + io_wqe_cancel_pending_work(wqe, &match); + free_cpumask_var(wqe->cpu_mask); + kfree(wqe); + } + io_wq_put_hash(wq->hash); + kfree(wq); +} + +void io_wq_put_and_exit(struct io_wq *wq) +{ + WARN_ON_ONCE(!test_bit(IO_WQ_BIT_EXIT, &wq->state)); + + io_wq_exit_workers(wq); + io_wq_destroy(wq); +} + +struct online_data { + unsigned int cpu; + bool online; +}; + +static bool io_wq_worker_affinity(struct io_worker *worker, void *data) +{ + struct online_data *od = data; + + if (od->online) + cpumask_set_cpu(od->cpu, worker->wqe->cpu_mask); + else + cpumask_clear_cpu(od->cpu, worker->wqe->cpu_mask); + return false; +} + +static int __io_wq_cpu_online(struct io_wq *wq, unsigned int cpu, bool online) +{ + struct online_data od = { + .cpu = cpu, + .online = online + }; + int i; + + rcu_read_lock(); + for_each_node(i) + io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, &od); + rcu_read_unlock(); + return 0; +} + +static int io_wq_cpu_online(unsigned int cpu, struct hlist_node *node) +{ + struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node); + + return __io_wq_cpu_online(wq, cpu, true); +} + +static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node) +{ + struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node); + + return __io_wq_cpu_online(wq, cpu, false); +} + +int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask) +{ + int i; + + rcu_read_lock(); + for_each_node(i) { + struct io_wqe *wqe = wq->wqes[i]; + + if (mask) + cpumask_copy(wqe->cpu_mask, mask); + else + cpumask_copy(wqe->cpu_mask, cpumask_of_node(i)); + } + rcu_read_unlock(); + return 0; +} + +/* + * Set max number of unbounded workers, returns old value. If new_count is 0, + * then just return the old value. + */ +int io_wq_max_workers(struct io_wq *wq, int *new_count) +{ + int prev[IO_WQ_ACCT_NR]; + bool first_node = true; + int i, node; + + BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND); + BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND); + BUILD_BUG_ON((int) IO_WQ_ACCT_NR != 2); + + for (i = 0; i < 2; i++) { + if (new_count[i] > task_rlimit(current, RLIMIT_NPROC)) + new_count[i] = task_rlimit(current, RLIMIT_NPROC); + } + + for (i = 0; i < IO_WQ_ACCT_NR; i++) + prev[i] = 0; + + rcu_read_lock(); + for_each_node(node) { + struct io_wqe *wqe = wq->wqes[node]; + struct io_wqe_acct *acct; + + raw_spin_lock(&wqe->lock); + for (i = 0; i < IO_WQ_ACCT_NR; i++) { + acct = &wqe->acct[i]; + if (first_node) + prev[i] = max_t(int, acct->max_workers, prev[i]); + if (new_count[i]) + acct->max_workers = new_count[i]; + } + raw_spin_unlock(&wqe->lock); + first_node = false; + } + rcu_read_unlock(); + + for (i = 0; i < IO_WQ_ACCT_NR; i++) + new_count[i] = prev[i]; + + return 0; +} + +static __init int io_wq_init(void) +{ + int ret; + + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "io-wq/online", + io_wq_cpu_online, io_wq_cpu_offline); + if (ret < 0) + return ret; + io_wq_online = ret; + return 0; +} +subsys_initcall(io_wq_init); diff --git a/io_uring/io-wq.h b/io_uring/io-wq.h new file mode 100644 index 0000000000000..bf5c4c5337605 --- /dev/null +++ b/io_uring/io-wq.h @@ -0,0 +1,160 @@ +#ifndef INTERNAL_IO_WQ_H +#define INTERNAL_IO_WQ_H + +#include + +struct io_wq; + +enum { + IO_WQ_WORK_CANCEL = 1, + IO_WQ_WORK_HASHED = 2, + IO_WQ_WORK_UNBOUND = 4, + IO_WQ_WORK_CONCURRENT = 16, + + IO_WQ_HASH_SHIFT = 24, /* upper 8 bits are used for hash key */ +}; + +enum io_wq_cancel { + IO_WQ_CANCEL_OK, /* cancelled before started */ + IO_WQ_CANCEL_RUNNING, /* found, running, and attempted cancelled */ + IO_WQ_CANCEL_NOTFOUND, /* work not found */ +}; + +struct io_wq_work_node { + struct io_wq_work_node *next; +}; + +struct io_wq_work_list { + struct io_wq_work_node *first; + struct io_wq_work_node *last; +}; + +static inline void wq_list_add_after(struct io_wq_work_node *node, + struct io_wq_work_node *pos, + struct io_wq_work_list *list) +{ + struct io_wq_work_node *next = pos->next; + + pos->next = node; + node->next = next; + if (!next) + list->last = node; +} + +static inline void wq_list_add_tail(struct io_wq_work_node *node, + struct io_wq_work_list *list) +{ + node->next = NULL; + if (!list->first) { + list->last = node; + WRITE_ONCE(list->first, node); + } else { + list->last->next = node; + list->last = node; + } +} + +static inline void wq_list_cut(struct io_wq_work_list *list, + struct io_wq_work_node *last, + struct io_wq_work_node *prev) +{ + /* first in the list, if prev==NULL */ + if (!prev) + WRITE_ONCE(list->first, last->next); + else + prev->next = last->next; + + if (last == list->last) + list->last = prev; + last->next = NULL; +} + +static inline void wq_list_del(struct io_wq_work_list *list, + struct io_wq_work_node *node, + struct io_wq_work_node *prev) +{ + wq_list_cut(list, node, prev); +} + +#define wq_list_for_each(pos, prv, head) \ + for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next) + +#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL) +#define INIT_WQ_LIST(list) do { \ + (list)->first = NULL; \ + (list)->last = NULL; \ +} while (0) + +struct io_wq_work { + struct io_wq_work_node list; + unsigned flags; +}; + +static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) +{ + if (!work->list.next) + return NULL; + + return container_of(work->list.next, struct io_wq_work, list); +} + +typedef struct io_wq_work *(free_work_fn)(struct io_wq_work *); +typedef void (io_wq_work_fn)(struct io_wq_work *); + +struct io_wq_hash { + refcount_t refs; + unsigned long map; + struct wait_queue_head wait; +}; + +static inline void io_wq_put_hash(struct io_wq_hash *hash) +{ + if (refcount_dec_and_test(&hash->refs)) + kfree(hash); +} + +struct io_wq_data { + struct io_wq_hash *hash; + struct task_struct *task; + io_wq_work_fn *do_work; + free_work_fn *free_work; +}; + +struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); +void io_wq_exit_start(struct io_wq *wq); +void io_wq_put_and_exit(struct io_wq *wq); + +void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); +void io_wq_hash_work(struct io_wq_work *work, void *val); + +int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask); +int io_wq_max_workers(struct io_wq *wq, int *new_count); + +static inline bool io_wq_is_hashed(struct io_wq_work *work) +{ + return work->flags & IO_WQ_WORK_HASHED; +} + +typedef bool (work_cancel_fn)(struct io_wq_work *, void *); + +enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel, + void *data, bool cancel_all); + +#if defined(CONFIG_IO_WQ) +extern void io_wq_worker_sleeping(struct task_struct *); +extern void io_wq_worker_running(struct task_struct *); +#else +static inline void io_wq_worker_sleeping(struct task_struct *tsk) +{ +} +static inline void io_wq_worker_running(struct task_struct *tsk) +{ +} +#endif + +static inline bool io_wq_current_is_worker(void) +{ + return in_task() && (current->flags & PF_IO_WORKER) && + current->pf_io_worker; +} +#endif diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c new file mode 100644 index 0000000000000..eebbe8a6da0c5 --- /dev/null +++ b/io_uring/io_uring.c @@ -0,0 +1,11112 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Shared application/kernel submission and completion ring pairs, for + * supporting fast/efficient IO. + * + * A note on the read/write ordering memory barriers that are matched between + * the application and kernel side. + * + * After the application reads the CQ ring tail, it must use an + * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses + * before writing the tail (using smp_load_acquire to read the tail will + * do). It also needs a smp_mb() before updating CQ head (ordering the + * entry load(s) with the head store), pairing with an implicit barrier + * through a control-dependency in io_get_cqe (smp_store_release to + * store head will do). Failure to do so could lead to reading invalid + * CQ entries. + * + * Likewise, the application must use an appropriate smp_wmb() before + * writing the SQ tail (ordering SQ entry stores with the tail store), + * which pairs with smp_load_acquire in io_get_sqring (smp_store_release + * to store the tail will do). And it needs a barrier ordering the SQ + * head load before writing new SQ entries (smp_load_acquire to read + * head will do). + * + * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application + * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* + * updating the SQ tail; a full memory barrier smp_mb() is needed + * between. + * + * Also see the examples in the liburing library: + * + * git://git.kernel.dk/liburing + * + * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens + * from data shared between the kernel and application. This is done both + * for ordering purposes, but also to ensure that once a value is loaded from + * data that the application could potentially modify, it remains stable. + * + * Copyright (C) 2018-2019 Jens Axboe + * Copyright (c) 2018-2019 Christoph Hellwig + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CREATE_TRACE_POINTS +#include + +#include + +#include "../fs/internal.h" +#include "io-wq.h" + +#define IORING_MAX_ENTRIES 32768 +#define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) +#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 + +/* only define max */ +#define IORING_MAX_FIXED_FILES (1U << 15) +#define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ + IORING_REGISTER_LAST + IORING_OP_LAST) + +#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) +#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) +#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) + +#define IORING_MAX_REG_BUFFERS (1U << 14) + +#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ + IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ + IOSQE_BUFFER_SELECT) +#define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ + REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) + +#define IO_TCTX_REFS_CACHE_NR (1U << 10) + +struct io_uring { + u32 head ____cacheline_aligned_in_smp; + u32 tail ____cacheline_aligned_in_smp; +}; + +/* + * This data is shared with the application through the mmap at offsets + * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. + * + * The offsets to the member fields are published through struct + * io_sqring_offsets when calling io_uring_setup. + */ +struct io_rings { + /* + * Head and tail offsets into the ring; the offsets need to be + * masked to get valid indices. + * + * The kernel controls head of the sq ring and the tail of the cq ring, + * and the application controls tail of the sq ring and the head of the + * cq ring. + */ + struct io_uring sq, cq; + /* + * Bitmasks to apply to head and tail offsets (constant, equals + * ring_entries - 1) + */ + u32 sq_ring_mask, cq_ring_mask; + /* Ring sizes (constant, power of 2) */ + u32 sq_ring_entries, cq_ring_entries; + /* + * Number of invalid entries dropped by the kernel due to + * invalid index stored in array + * + * Written by the kernel, shouldn't be modified by the + * application (i.e. get number of "new events" by comparing to + * cached value). + * + * After a new SQ head value was read by the application this + * counter includes all submissions that were dropped reaching + * the new SQ head (and possibly more). + */ + u32 sq_dropped; + /* + * Runtime SQ flags + * + * Written by the kernel, shouldn't be modified by the + * application. + * + * The application needs a full memory barrier before checking + * for IORING_SQ_NEED_WAKEUP after updating the sq tail. + */ + u32 sq_flags; + /* + * Runtime CQ flags + * + * Written by the application, shouldn't be modified by the + * kernel. + */ + u32 cq_flags; + /* + * Number of completion events lost because the queue was full; + * this should be avoided by the application by making sure + * there are not more requests pending than there is space in + * the completion queue. + * + * Written by the kernel, shouldn't be modified by the + * application (i.e. get number of "new events" by comparing to + * cached value). + * + * As completion events come in out of order this counter is not + * ordered with any other data. + */ + u32 cq_overflow; + /* + * Ring buffer of completion events. + * + * The kernel writes completion events fresh every time they are + * produced, so the application is allowed to modify pending + * entries. + */ + struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; +}; + +enum io_uring_cmd_flags { + IO_URING_F_NONBLOCK = 1, + IO_URING_F_COMPLETE_DEFER = 2, +}; + +struct io_mapped_ubuf { + u64 ubuf; + u64 ubuf_end; + unsigned int nr_bvecs; + unsigned long acct_pages; + struct bio_vec bvec[]; +}; + +struct io_ring_ctx; + +struct io_overflow_cqe { + struct io_uring_cqe cqe; + struct list_head list; +}; + +struct io_fixed_file { + /* file * with additional FFS_* flags */ + unsigned long file_ptr; +}; + +struct io_rsrc_put { + struct list_head list; + u64 tag; + union { + void *rsrc; + struct file *file; + struct io_mapped_ubuf *buf; + }; +}; + +struct io_file_table { + struct io_fixed_file *files; +}; + +struct io_rsrc_node { + struct percpu_ref refs; + struct list_head node; + struct list_head rsrc_list; + struct io_rsrc_data *rsrc_data; + struct llist_node llist; + bool done; +}; + +typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); + +struct io_rsrc_data { + struct io_ring_ctx *ctx; + + u64 **tags; + unsigned int nr; + rsrc_put_fn *do_put; + atomic_t refs; + struct completion done; + bool quiesce; +}; + +struct io_buffer { + struct list_head list; + __u64 addr; + __u32 len; + __u16 bid; +}; + +struct io_restriction { + DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); + DECLARE_BITMAP(sqe_op, IORING_OP_LAST); + u8 sqe_flags_allowed; + u8 sqe_flags_required; + bool registered; +}; + +enum { + IO_SQ_THREAD_SHOULD_STOP = 0, + IO_SQ_THREAD_SHOULD_PARK, +}; + +struct io_sq_data { + refcount_t refs; + atomic_t park_pending; + struct mutex lock; + + /* ctx's that are using this sqd */ + struct list_head ctx_list; + + struct task_struct *thread; + struct wait_queue_head wait; + + unsigned sq_thread_idle; + int sq_cpu; + pid_t task_pid; + pid_t task_tgid; + + unsigned long state; + struct completion exited; +}; + +#define IO_COMPL_BATCH 32 +#define IO_REQ_CACHE_SIZE 32 +#define IO_REQ_ALLOC_BATCH 8 + +struct io_submit_link { + struct io_kiocb *head; + struct io_kiocb *last; +}; + +struct io_submit_state { + struct blk_plug plug; + struct io_submit_link link; + + /* + * io_kiocb alloc cache + */ + void *reqs[IO_REQ_CACHE_SIZE]; + unsigned int free_reqs; + + bool plug_started; + + /* + * Batch completion logic + */ + struct io_kiocb *compl_reqs[IO_COMPL_BATCH]; + unsigned int compl_nr; + /* inline/task_work completion list, under ->uring_lock */ + struct list_head free_list; + + unsigned int ios_left; +}; + +struct io_ring_ctx { + /* const or read-mostly hot data */ + struct { + struct percpu_ref refs; + + struct io_rings *rings; + unsigned int flags; + unsigned int compat: 1; + unsigned int drain_next: 1; + unsigned int eventfd_async: 1; + unsigned int restricted: 1; + unsigned int off_timeout_used: 1; + unsigned int drain_active: 1; + } ____cacheline_aligned_in_smp; + + /* submission data */ + struct { + struct mutex uring_lock; + + /* + * Ring buffer of indices into array of io_uring_sqe, which is + * mmapped by the application using the IORING_OFF_SQES offset. + * + * This indirection could e.g. be used to assign fixed + * io_uring_sqe entries to operations and only submit them to + * the queue when needed. + * + * The kernel modifies neither the indices array nor the entries + * array. + */ + u32 *sq_array; + struct io_uring_sqe *sq_sqes; + unsigned cached_sq_head; + unsigned sq_entries; + struct list_head defer_list; + + /* + * Fixed resources fast path, should be accessed only under + * uring_lock, and updated through io_uring_register(2) + */ + struct io_rsrc_node *rsrc_node; + struct io_file_table file_table; + unsigned nr_user_files; + unsigned nr_user_bufs; + struct io_mapped_ubuf **user_bufs; + + struct io_submit_state submit_state; + struct list_head timeout_list; + struct list_head ltimeout_list; + struct list_head cq_overflow_list; + struct xarray io_buffers; + struct xarray personalities; + u32 pers_next; + unsigned sq_thread_idle; + } ____cacheline_aligned_in_smp; + + /* IRQ completion list, under ->completion_lock */ + struct list_head locked_free_list; + unsigned int locked_free_nr; + + const struct cred *sq_creds; /* cred used for __io_sq_thread() */ + struct io_sq_data *sq_data; /* if using sq thread polling */ + + struct wait_queue_head sqo_sq_wait; + struct list_head sqd_list; + + unsigned long check_cq_overflow; + + struct { + unsigned cached_cq_tail; + unsigned cq_entries; + struct eventfd_ctx *cq_ev_fd; + struct wait_queue_head poll_wait; + struct wait_queue_head cq_wait; + unsigned cq_extra; + atomic_t cq_timeouts; + unsigned cq_last_tm_flush; + } ____cacheline_aligned_in_smp; + + struct { + spinlock_t completion_lock; + + spinlock_t timeout_lock; + + /* + * ->iopoll_list is protected by the ctx->uring_lock for + * io_uring instances that don't use IORING_SETUP_SQPOLL. + * For SQPOLL, only the single threaded io_sq_thread() will + * manipulate the list, hence no extra locking is needed there. + */ + struct list_head iopoll_list; + struct hlist_head *cancel_hash; + unsigned cancel_hash_bits; + bool poll_multi_queue; + } ____cacheline_aligned_in_smp; + + struct io_restriction restrictions; + + /* slow path rsrc auxilary data, used by update/register */ + struct { + struct io_rsrc_node *rsrc_backup_node; + struct io_mapped_ubuf *dummy_ubuf; + struct io_rsrc_data *file_data; + struct io_rsrc_data *buf_data; + + struct delayed_work rsrc_put_work; + struct llist_head rsrc_put_llist; + struct list_head rsrc_ref_list; + spinlock_t rsrc_ref_lock; + }; + + /* Keep this last, we don't need it for the fast path */ + struct { + #if defined(CONFIG_UNIX) + struct socket *ring_sock; + #endif + /* hashed buffered write serialization */ + struct io_wq_hash *hash_map; + + /* Only used for accounting purposes */ + struct user_struct *user; + struct mm_struct *mm_account; + + /* ctx exit and cancelation */ + struct llist_head fallback_llist; + struct delayed_work fallback_work; + struct work_struct exit_work; + struct list_head tctx_list; + struct completion ref_comp; + u32 iowq_limits[2]; + bool iowq_limits_set; + }; +}; + +struct io_uring_task { + /* submission side */ + int cached_refs; + struct xarray xa; + struct wait_queue_head wait; + const struct io_ring_ctx *last; + struct io_wq *io_wq; + struct percpu_counter inflight; + atomic_t inflight_tracked; + atomic_t in_idle; + + spinlock_t task_lock; + struct io_wq_work_list task_list; + struct callback_head task_work; + bool task_running; +}; + +/* + * First field must be the file pointer in all the + * iocb unions! See also 'struct kiocb' in + */ +struct io_poll_iocb { + struct file *file; + struct wait_queue_head *head; + __poll_t events; + struct wait_queue_entry wait; +}; + +struct io_poll_update { + struct file *file; + u64 old_user_data; + u64 new_user_data; + __poll_t events; + bool update_events; + bool update_user_data; +}; + +struct io_close { + struct file *file; + int fd; + u32 file_slot; +}; + +struct io_timeout_data { + struct io_kiocb *req; + struct hrtimer timer; + struct timespec64 ts; + enum hrtimer_mode mode; + u32 flags; +}; + +struct io_accept { + struct file *file; + struct sockaddr __user *addr; + int __user *addr_len; + int flags; + u32 file_slot; + unsigned long nofile; +}; + +struct io_sync { + struct file *file; + loff_t len; + loff_t off; + int flags; + int mode; +}; + +struct io_cancel { + struct file *file; + u64 addr; +}; + +struct io_timeout { + struct file *file; + u32 off; + u32 target_seq; + struct list_head list; + /* head of the link, used by linked timeouts only */ + struct io_kiocb *head; + /* for linked completions */ + struct io_kiocb *prev; +}; + +struct io_timeout_rem { + struct file *file; + u64 addr; + + /* timeout update */ + struct timespec64 ts; + u32 flags; + bool ltimeout; +}; + +struct io_rw { + /* NOTE: kiocb has the file as the first member, so don't do it here */ + struct kiocb kiocb; + u64 addr; + u64 len; +}; + +struct io_connect { + struct file *file; + struct sockaddr __user *addr; + int addr_len; +}; + +struct io_sr_msg { + struct file *file; + union { + struct compat_msghdr __user *umsg_compat; + struct user_msghdr __user *umsg; + void __user *buf; + }; + int msg_flags; + int bgid; + size_t len; + struct io_buffer *kbuf; +}; + +struct io_open { + struct file *file; + int dfd; + u32 file_slot; + struct filename *filename; + struct open_how how; + unsigned long nofile; +}; + +struct io_rsrc_update { + struct file *file; + u64 arg; + u32 nr_args; + u32 offset; +}; + +struct io_fadvise { + struct file *file; + u64 offset; + u32 len; + u32 advice; +}; + +struct io_madvise { + struct file *file; + u64 addr; + u32 len; + u32 advice; +}; + +struct io_epoll { + struct file *file; + int epfd; + int op; + int fd; + struct epoll_event event; +}; + +struct io_splice { + struct file *file_out; + loff_t off_out; + loff_t off_in; + u64 len; + int splice_fd_in; + unsigned int flags; +}; + +struct io_provide_buf { + struct file *file; + __u64 addr; + __u32 len; + __u32 bgid; + __u16 nbufs; + __u16 bid; +}; + +struct io_statx { + struct file *file; + int dfd; + unsigned int mask; + unsigned int flags; + const char __user *filename; + struct statx __user *buffer; +}; + +struct io_shutdown { + struct file *file; + int how; +}; + +struct io_rename { + struct file *file; + int old_dfd; + int new_dfd; + struct filename *oldpath; + struct filename *newpath; + int flags; +}; + +struct io_unlink { + struct file *file; + int dfd; + int flags; + struct filename *filename; +}; + +struct io_mkdir { + struct file *file; + int dfd; + umode_t mode; + struct filename *filename; +}; + +struct io_symlink { + struct file *file; + int new_dfd; + struct filename *oldpath; + struct filename *newpath; +}; + +struct io_hardlink { + struct file *file; + int old_dfd; + int new_dfd; + struct filename *oldpath; + struct filename *newpath; + int flags; +}; + +struct io_completion { + struct file *file; + u32 cflags; +}; + +struct io_async_connect { + struct sockaddr_storage address; +}; + +struct io_async_msghdr { + struct iovec fast_iov[UIO_FASTIOV]; + /* points to an allocated iov, if NULL we use fast_iov instead */ + struct iovec *free_iov; + struct sockaddr __user *uaddr; + struct msghdr msg; + struct sockaddr_storage addr; +}; + +struct io_async_rw { + struct iovec fast_iov[UIO_FASTIOV]; + const struct iovec *free_iovec; + struct iov_iter iter; + struct iov_iter_state iter_state; + size_t bytes_done; + struct wait_page_queue wpq; +}; + +enum { + REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, + REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, + REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, + REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, + REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, + REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, + + /* first byte is taken by user flags, shift it to not overlap */ + REQ_F_FAIL_BIT = 8, + REQ_F_INFLIGHT_BIT, + REQ_F_CUR_POS_BIT, + REQ_F_NOWAIT_BIT, + REQ_F_LINK_TIMEOUT_BIT, + REQ_F_NEED_CLEANUP_BIT, + REQ_F_POLLED_BIT, + REQ_F_BUFFER_SELECTED_BIT, + REQ_F_COMPLETE_INLINE_BIT, + REQ_F_REISSUE_BIT, + REQ_F_CREDS_BIT, + REQ_F_REFCOUNT_BIT, + REQ_F_ARM_LTIMEOUT_BIT, + /* keep async read/write and isreg together and in order */ + REQ_F_NOWAIT_READ_BIT, + REQ_F_NOWAIT_WRITE_BIT, + REQ_F_ISREG_BIT, + + /* not a real bit, just to check we're not overflowing the space */ + __REQ_F_LAST_BIT, +}; + +enum { + /* ctx owns file */ + REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), + /* drain existing IO first */ + REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), + /* linked sqes */ + REQ_F_LINK = BIT(REQ_F_LINK_BIT), + /* doesn't sever on completion < 0 */ + REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), + /* IOSQE_ASYNC */ + REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), + /* IOSQE_BUFFER_SELECT */ + REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), + + /* fail rest of links */ + REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), + /* on inflight list, should be cancelled and waited on exit reliably */ + REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), + /* read/write uses file position */ + REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), + /* must not punt to workers */ + REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), + /* has or had linked timeout */ + REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), + /* needs cleanup */ + REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), + /* already went through poll handler */ + REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), + /* buffer already selected */ + REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), + /* completion is deferred through io_comp_state */ + REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), + /* caller should reissue async */ + REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), + /* supports async reads */ + REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), + /* supports async writes */ + REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), + /* regular file */ + REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), + /* has creds assigned */ + REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), + /* skip refcounting if not set */ + REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), + /* there is a linked timeout that has to be armed */ + REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), +}; + +struct async_poll { + struct io_poll_iocb poll; + struct io_poll_iocb *double_poll; +}; + +typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); + +struct io_task_work { + union { + struct io_wq_work_node node; + struct llist_node fallback_node; + }; + io_req_tw_func_t func; +}; + +enum { + IORING_RSRC_FILE = 0, + IORING_RSRC_BUFFER = 1, +}; + +/* + * NOTE! Each of the iocb union members has the file pointer + * as the first entry in their struct definition. So you can + * access the file pointer through any of the sub-structs, + * or directly as just 'ki_filp' in this struct. + */ +struct io_kiocb { + union { + struct file *file; + struct io_rw rw; + struct io_poll_iocb poll; + struct io_poll_update poll_update; + struct io_accept accept; + struct io_sync sync; + struct io_cancel cancel; + struct io_timeout timeout; + struct io_timeout_rem timeout_rem; + struct io_connect connect; + struct io_sr_msg sr_msg; + struct io_open open; + struct io_close close; + struct io_rsrc_update rsrc_update; + struct io_fadvise fadvise; + struct io_madvise madvise; + struct io_epoll epoll; + struct io_splice splice; + struct io_provide_buf pbuf; + struct io_statx statx; + struct io_shutdown shutdown; + struct io_rename rename; + struct io_unlink unlink; + struct io_mkdir mkdir; + struct io_symlink symlink; + struct io_hardlink hardlink; + /* use only after cleaning per-op data, see io_clean_op() */ + struct io_completion compl; + }; + + /* opcode allocated if it needs to store data for async defer */ + void *async_data; + u8 opcode; + /* polled IO has completed */ + u8 iopoll_completed; + + u16 buf_index; + u32 result; + + struct io_ring_ctx *ctx; + unsigned int flags; + atomic_t refs; + struct task_struct *task; + u64 user_data; + + struct io_kiocb *link; + struct percpu_ref *fixed_rsrc_refs; + + /* used with ctx->iopoll_list with reads/writes */ + struct list_head inflight_entry; + struct io_task_work io_task_work; + /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ + struct hlist_node hash_node; + struct async_poll *apoll; + struct io_wq_work work; + const struct cred *creds; + + /* store used ubuf, so we can prevent reloading */ + struct io_mapped_ubuf *imu; + /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ + struct io_buffer *kbuf; + atomic_t poll_refs; +}; + +struct io_tctx_node { + struct list_head ctx_node; + struct task_struct *task; + struct io_ring_ctx *ctx; +}; + +struct io_defer_entry { + struct list_head list; + struct io_kiocb *req; + u32 seq; +}; + +struct io_op_def { + /* needs req->file assigned */ + unsigned needs_file : 1; + /* hash wq insertion if file is a regular file */ + unsigned hash_reg_file : 1; + /* unbound wq insertion if file is a non-regular file */ + unsigned unbound_nonreg_file : 1; + /* opcode is not supported by this kernel */ + unsigned not_supported : 1; + /* set if opcode supports polled "wait" */ + unsigned pollin : 1; + unsigned pollout : 1; + /* op supports buffer selection */ + unsigned buffer_select : 1; + /* do prep async if is going to be punted */ + unsigned needs_async_setup : 1; + /* should block plug */ + unsigned plug : 1; + /* size of async data needed, if any */ + unsigned short async_size; +}; + +static const struct io_op_def io_op_defs[] = { + [IORING_OP_NOP] = {}, + [IORING_OP_READV] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + .buffer_select = 1, + .needs_async_setup = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_WRITEV] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .needs_async_setup = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_FSYNC] = { + .needs_file = 1, + }, + [IORING_OP_READ_FIXED] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_WRITE_FIXED] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_POLL_ADD] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + }, + [IORING_OP_POLL_REMOVE] = {}, + [IORING_OP_SYNC_FILE_RANGE] = { + .needs_file = 1, + }, + [IORING_OP_SENDMSG] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .needs_async_setup = 1, + .async_size = sizeof(struct io_async_msghdr), + }, + [IORING_OP_RECVMSG] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + .buffer_select = 1, + .needs_async_setup = 1, + .async_size = sizeof(struct io_async_msghdr), + }, + [IORING_OP_TIMEOUT] = { + .async_size = sizeof(struct io_timeout_data), + }, + [IORING_OP_TIMEOUT_REMOVE] = { + /* used by timeout updates' prep() */ + }, + [IORING_OP_ACCEPT] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + }, + [IORING_OP_ASYNC_CANCEL] = {}, + [IORING_OP_LINK_TIMEOUT] = { + .async_size = sizeof(struct io_timeout_data), + }, + [IORING_OP_CONNECT] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .needs_async_setup = 1, + .async_size = sizeof(struct io_async_connect), + }, + [IORING_OP_FALLOCATE] = { + .needs_file = 1, + }, + [IORING_OP_OPENAT] = {}, + [IORING_OP_CLOSE] = {}, + [IORING_OP_FILES_UPDATE] = {}, + [IORING_OP_STATX] = {}, + [IORING_OP_READ] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + .buffer_select = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_WRITE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + .plug = 1, + .async_size = sizeof(struct io_async_rw), + }, + [IORING_OP_FADVISE] = { + .needs_file = 1, + }, + [IORING_OP_MADVISE] = {}, + [IORING_OP_SEND] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollout = 1, + }, + [IORING_OP_RECV] = { + .needs_file = 1, + .unbound_nonreg_file = 1, + .pollin = 1, + .buffer_select = 1, + }, + [IORING_OP_OPENAT2] = { + }, + [IORING_OP_EPOLL_CTL] = { + .unbound_nonreg_file = 1, + }, + [IORING_OP_SPLICE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + }, + [IORING_OP_PROVIDE_BUFFERS] = {}, + [IORING_OP_REMOVE_BUFFERS] = {}, + [IORING_OP_TEE] = { + .needs_file = 1, + .hash_reg_file = 1, + .unbound_nonreg_file = 1, + }, + [IORING_OP_SHUTDOWN] = { + .needs_file = 1, + }, + [IORING_OP_RENAMEAT] = {}, + [IORING_OP_UNLINKAT] = {}, + [IORING_OP_MKDIRAT] = {}, + [IORING_OP_SYMLINKAT] = {}, + [IORING_OP_LINKAT] = {}, +}; + +/* requests with any of those set should undergo io_disarm_next() */ +#define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) + +static bool io_disarm_next(struct io_kiocb *req); +static void io_uring_del_tctx_node(unsigned long index); +static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, + struct task_struct *task, + bool cancel_all); +static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); + +static void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags); + +static void io_put_req(struct io_kiocb *req); +static void io_put_req_deferred(struct io_kiocb *req); +static void io_dismantle_req(struct io_kiocb *req); +static void io_queue_linked_timeout(struct io_kiocb *req); +static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, + struct io_uring_rsrc_update2 *up, + unsigned nr_args); +static void io_clean_op(struct io_kiocb *req); +static struct file *io_file_get(struct io_ring_ctx *ctx, + struct io_kiocb *req, int fd, bool fixed); +static void __io_queue_sqe(struct io_kiocb *req); +static void io_rsrc_put_work(struct work_struct *work); + +static void io_req_task_queue(struct io_kiocb *req); +static void io_submit_flush_completions(struct io_ring_ctx *ctx); +static int io_req_prep_async(struct io_kiocb *req); + +static int io_install_fixed_file(struct io_kiocb *req, struct file *file, + unsigned int issue_flags, u32 slot_index); +static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); + +static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); + +static struct kmem_cache *req_cachep; + +static const struct file_operations io_uring_fops; + +struct sock *io_uring_get_socket(struct file *file) +{ +#if defined(CONFIG_UNIX) + if (file->f_op == &io_uring_fops) { + struct io_ring_ctx *ctx = file->private_data; + + return ctx->ring_sock->sk; + } +#endif + return NULL; +} +EXPORT_SYMBOL(io_uring_get_socket); + +static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) +{ + if (!*locked) { + mutex_lock(&ctx->uring_lock); + *locked = true; + } +} + +#define io_for_each_link(pos, head) \ + for (pos = (head); pos; pos = pos->link) + +/* + * Shamelessly stolen from the mm implementation of page reference checking, + * see commit f958d7b528b1 for details. + */ +#define req_ref_zero_or_close_to_overflow(req) \ + ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) + +static inline bool req_ref_inc_not_zero(struct io_kiocb *req) +{ + WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); + return atomic_inc_not_zero(&req->refs); +} + +static inline bool req_ref_put_and_test(struct io_kiocb *req) +{ + if (likely(!(req->flags & REQ_F_REFCOUNT))) + return true; + + WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); + return atomic_dec_and_test(&req->refs); +} + +static inline void req_ref_get(struct io_kiocb *req) +{ + WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); + WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); + atomic_inc(&req->refs); +} + +static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) +{ + if (!(req->flags & REQ_F_REFCOUNT)) { + req->flags |= REQ_F_REFCOUNT; + atomic_set(&req->refs, nr); + } +} + +static inline void io_req_set_refcount(struct io_kiocb *req) +{ + __io_req_set_refcount(req, 1); +} + +static inline void io_req_set_rsrc_node(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (!req->fixed_rsrc_refs) { + req->fixed_rsrc_refs = &ctx->rsrc_node->refs; + percpu_ref_get(req->fixed_rsrc_refs); + } +} + +static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) +{ + bool got = percpu_ref_tryget(ref); + + /* already at zero, wait for ->release() */ + if (!got) + wait_for_completion(compl); + percpu_ref_resurrect(ref); + if (got) + percpu_ref_put(ref); +} + +static bool io_match_task(struct io_kiocb *head, struct task_struct *task, + bool cancel_all) + __must_hold(&req->ctx->timeout_lock) +{ + struct io_kiocb *req; + + if (task && head->task != task) + return false; + if (cancel_all) + return true; + + io_for_each_link(req, head) { + if (req->flags & REQ_F_INFLIGHT) + return true; + } + return false; +} + +static bool io_match_linked(struct io_kiocb *head) +{ + struct io_kiocb *req; + + io_for_each_link(req, head) { + if (req->flags & REQ_F_INFLIGHT) + return true; + } + return false; +} + +/* + * As io_match_task() but protected against racing with linked timeouts. + * User must not hold timeout_lock. + */ +static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, + bool cancel_all) +{ + bool matched; + + if (task && head->task != task) + return false; + if (cancel_all) + return true; + + if (head->flags & REQ_F_LINK_TIMEOUT) { + struct io_ring_ctx *ctx = head->ctx; + + /* protect against races with linked timeouts */ + spin_lock_irq(&ctx->timeout_lock); + matched = io_match_linked(head); + spin_unlock_irq(&ctx->timeout_lock); + } else { + matched = io_match_linked(head); + } + return matched; +} + +static inline void req_set_fail(struct io_kiocb *req) +{ + req->flags |= REQ_F_FAIL; +} + +static inline void req_fail_link_node(struct io_kiocb *req, int res) +{ + req_set_fail(req); + req->result = res; +} + +static void io_ring_ctx_ref_free(struct percpu_ref *ref) +{ + struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); + + complete(&ctx->ref_comp); +} + +static inline bool io_is_timeout_noseq(struct io_kiocb *req) +{ + return !req->timeout.off; +} + +static void io_fallback_req_func(struct work_struct *work) +{ + struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, + fallback_work.work); + struct llist_node *node = llist_del_all(&ctx->fallback_llist); + struct io_kiocb *req, *tmp; + bool locked = false; + + percpu_ref_get(&ctx->refs); + llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) + req->io_task_work.func(req, &locked); + + if (locked) { + if (ctx->submit_state.compl_nr) + io_submit_flush_completions(ctx); + mutex_unlock(&ctx->uring_lock); + } + percpu_ref_put(&ctx->refs); + +} + +static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) +{ + struct io_ring_ctx *ctx; + int hash_bits; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return NULL; + + /* + * Use 5 bits less than the max cq entries, that should give us around + * 32 entries per hash list if totally full and uniformly spread. + */ + hash_bits = ilog2(p->cq_entries); + hash_bits -= 5; + if (hash_bits <= 0) + hash_bits = 1; + ctx->cancel_hash_bits = hash_bits; + ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), + GFP_KERNEL); + if (!ctx->cancel_hash) + goto err; + __hash_init(ctx->cancel_hash, 1U << hash_bits); + + ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); + if (!ctx->dummy_ubuf) + goto err; + /* set invalid range, so io_import_fixed() fails meeting it */ + ctx->dummy_ubuf->ubuf = -1UL; + + if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, + PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) + goto err; + + ctx->flags = p->flags; + init_waitqueue_head(&ctx->sqo_sq_wait); + INIT_LIST_HEAD(&ctx->sqd_list); + init_waitqueue_head(&ctx->poll_wait); + INIT_LIST_HEAD(&ctx->cq_overflow_list); + init_completion(&ctx->ref_comp); + xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); + xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); + mutex_init(&ctx->uring_lock); + init_waitqueue_head(&ctx->cq_wait); + spin_lock_init(&ctx->completion_lock); + spin_lock_init(&ctx->timeout_lock); + INIT_LIST_HEAD(&ctx->iopoll_list); + INIT_LIST_HEAD(&ctx->defer_list); + INIT_LIST_HEAD(&ctx->timeout_list); + INIT_LIST_HEAD(&ctx->ltimeout_list); + spin_lock_init(&ctx->rsrc_ref_lock); + INIT_LIST_HEAD(&ctx->rsrc_ref_list); + INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); + init_llist_head(&ctx->rsrc_put_llist); + INIT_LIST_HEAD(&ctx->tctx_list); + INIT_LIST_HEAD(&ctx->submit_state.free_list); + INIT_LIST_HEAD(&ctx->locked_free_list); + INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); + return ctx; +err: + kfree(ctx->dummy_ubuf); + kfree(ctx->cancel_hash); + kfree(ctx); + return NULL; +} + +static void io_account_cq_overflow(struct io_ring_ctx *ctx) +{ + struct io_rings *r = ctx->rings; + + WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); + ctx->cq_extra--; +} + +static bool req_need_defer(struct io_kiocb *req, u32 seq) +{ + if (unlikely(req->flags & REQ_F_IO_DRAIN)) { + struct io_ring_ctx *ctx = req->ctx; + + return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; + } + + return false; +} + +#define FFS_ASYNC_READ 0x1UL +#define FFS_ASYNC_WRITE 0x2UL +#ifdef CONFIG_64BIT +#define FFS_ISREG 0x4UL +#else +#define FFS_ISREG 0x0UL +#endif +#define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) + +static inline bool io_req_ffs_set(struct io_kiocb *req) +{ + return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); +} + +static void io_req_track_inflight(struct io_kiocb *req) +{ + if (!(req->flags & REQ_F_INFLIGHT)) { + req->flags |= REQ_F_INFLIGHT; + atomic_inc(&req->task->io_uring->inflight_tracked); + } +} + +static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) +{ + if (WARN_ON_ONCE(!req->link)) + return NULL; + + req->flags &= ~REQ_F_ARM_LTIMEOUT; + req->flags |= REQ_F_LINK_TIMEOUT; + + /* linked timeouts should have two refs once prep'ed */ + io_req_set_refcount(req); + __io_req_set_refcount(req->link, 2); + return req->link; +} + +static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) +{ + if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) + return NULL; + return __io_prep_linked_timeout(req); +} + +static void io_prep_async_work(struct io_kiocb *req) +{ + const struct io_op_def *def = &io_op_defs[req->opcode]; + struct io_ring_ctx *ctx = req->ctx; + + if (!(req->flags & REQ_F_CREDS)) { + req->flags |= REQ_F_CREDS; + req->creds = get_current_cred(); + } + + req->work.list.next = NULL; + req->work.flags = 0; + if (req->flags & REQ_F_FORCE_ASYNC) + req->work.flags |= IO_WQ_WORK_CONCURRENT; + + if (req->flags & REQ_F_ISREG) { + if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) + io_wq_hash_work(&req->work, file_inode(req->file)); + } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { + if (def->unbound_nonreg_file) + req->work.flags |= IO_WQ_WORK_UNBOUND; + } +} + +static void io_prep_async_link(struct io_kiocb *req) +{ + struct io_kiocb *cur; + + if (req->flags & REQ_F_LINK_TIMEOUT) { + struct io_ring_ctx *ctx = req->ctx; + + spin_lock_irq(&ctx->timeout_lock); + io_for_each_link(cur, req) + io_prep_async_work(cur); + spin_unlock_irq(&ctx->timeout_lock); + } else { + io_for_each_link(cur, req) + io_prep_async_work(cur); + } +} + +static void io_queue_async_work(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_kiocb *link = io_prep_linked_timeout(req); + struct io_uring_task *tctx = req->task->io_uring; + + /* must not take the lock, NULL it as a precaution */ + locked = NULL; + + BUG_ON(!tctx); + BUG_ON(!tctx->io_wq); + + /* init ->work of the whole link before punting */ + io_prep_async_link(req); + + /* + * Not expected to happen, but if we do have a bug where this _can_ + * happen, catch it here and ensure the request is marked as + * canceled. That will make io-wq go through the usual work cancel + * procedure rather than attempt to run this request (or create a new + * worker for it). + */ + if (WARN_ON_ONCE(!same_thread_group(req->task, current))) + req->work.flags |= IO_WQ_WORK_CANCEL; + + trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, + &req->work, req->flags); + io_wq_enqueue(tctx->io_wq, &req->work); + if (link) + io_queue_linked_timeout(link); +} + +static void io_kill_timeout(struct io_kiocb *req, int status) + __must_hold(&req->ctx->completion_lock) + __must_hold(&req->ctx->timeout_lock) +{ + struct io_timeout_data *io = req->async_data; + + if (hrtimer_try_to_cancel(&io->timer) != -1) { + if (status) + req_set_fail(req); + atomic_set(&req->ctx->cq_timeouts, + atomic_read(&req->ctx->cq_timeouts) + 1); + list_del_init(&req->timeout.list); + io_fill_cqe_req(req, status, 0); + io_put_req_deferred(req); + } +} + +static void io_queue_deferred(struct io_ring_ctx *ctx) +{ + while (!list_empty(&ctx->defer_list)) { + struct io_defer_entry *de = list_first_entry(&ctx->defer_list, + struct io_defer_entry, list); + + if (req_need_defer(de->req, de->seq)) + break; + list_del_init(&de->list); + io_req_task_queue(de->req); + kfree(de); + } +} + +static void io_flush_timeouts(struct io_ring_ctx *ctx) + __must_hold(&ctx->completion_lock) +{ + u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); + struct io_kiocb *req, *tmp; + + spin_lock_irq(&ctx->timeout_lock); + list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { + u32 events_needed, events_got; + + if (io_is_timeout_noseq(req)) + break; + + /* + * Since seq can easily wrap around over time, subtract + * the last seq at which timeouts were flushed before comparing. + * Assuming not more than 2^31-1 events have happened since, + * these subtractions won't have wrapped, so we can check if + * target is in [last_seq, current_seq] by comparing the two. + */ + events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; + events_got = seq - ctx->cq_last_tm_flush; + if (events_got < events_needed) + break; + + io_kill_timeout(req, 0); + } + ctx->cq_last_tm_flush = seq; + spin_unlock_irq(&ctx->timeout_lock); +} + +static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) +{ + if (ctx->off_timeout_used) + io_flush_timeouts(ctx); + if (ctx->drain_active) + io_queue_deferred(ctx); +} + +static inline void io_commit_cqring(struct io_ring_ctx *ctx) +{ + if (unlikely(ctx->off_timeout_used || ctx->drain_active)) + __io_commit_cqring_flush(ctx); + /* order cqe stores with ring update */ + smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); +} + +static inline bool io_sqring_full(struct io_ring_ctx *ctx) +{ + struct io_rings *r = ctx->rings; + + return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; +} + +static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) +{ + return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); +} + +static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) +{ + struct io_rings *rings = ctx->rings; + unsigned tail, mask = ctx->cq_entries - 1; + + /* + * writes to the cq entry need to come after reading head; the + * control dependency is enough as we're using WRITE_ONCE to + * fill the cq entry + */ + if (__io_cqring_events(ctx) == ctx->cq_entries) + return NULL; + + tail = ctx->cached_cq_tail++; + return &rings->cqes[tail & mask]; +} + +static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) +{ + if (likely(!ctx->cq_ev_fd)) + return false; + if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) + return false; + return !ctx->eventfd_async || io_wq_current_is_worker(); +} + +/* + * This should only get called when at least one event has been posted. + * Some applications rely on the eventfd notification count only changing + * IFF a new CQE has been added to the CQ ring. There's no depedency on + * 1:1 relationship between how many times this function is called (and + * hence the eventfd count) and number of CQEs posted to the CQ ring. + */ +static void io_cqring_ev_posted(struct io_ring_ctx *ctx) +{ + /* + * wake_up_all() may seem excessive, but io_wake_function() and + * io_should_wake() handle the termination of the loop and only + * wake as many waiters as we need to. + */ + if (wq_has_sleeper(&ctx->cq_wait)) + wake_up_all(&ctx->cq_wait); + if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) + wake_up(&ctx->sq_data->wait); + if (io_should_trigger_evfd(ctx)) + eventfd_signal(ctx->cq_ev_fd, 1); + if (waitqueue_active(&ctx->poll_wait)) + wake_up_interruptible(&ctx->poll_wait); +} + +static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) +{ + /* see waitqueue_active() comment */ + smp_mb(); + + if (ctx->flags & IORING_SETUP_SQPOLL) { + if (waitqueue_active(&ctx->cq_wait)) + wake_up_all(&ctx->cq_wait); + } + if (io_should_trigger_evfd(ctx)) + eventfd_signal(ctx->cq_ev_fd, 1); + if (waitqueue_active(&ctx->poll_wait)) + wake_up_interruptible(&ctx->poll_wait); +} + +/* Returns true if there are no backlogged entries after the flush */ +static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) +{ + bool all_flushed, posted; + + if (!force && __io_cqring_events(ctx) == ctx->cq_entries) + return false; + + posted = false; + spin_lock(&ctx->completion_lock); + while (!list_empty(&ctx->cq_overflow_list)) { + struct io_uring_cqe *cqe = io_get_cqe(ctx); + struct io_overflow_cqe *ocqe; + + if (!cqe && !force) + break; + ocqe = list_first_entry(&ctx->cq_overflow_list, + struct io_overflow_cqe, list); + if (cqe) + memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); + else + io_account_cq_overflow(ctx); + + posted = true; + list_del(&ocqe->list); + kfree(ocqe); + } + + all_flushed = list_empty(&ctx->cq_overflow_list); + if (all_flushed) { + clear_bit(0, &ctx->check_cq_overflow); + WRITE_ONCE(ctx->rings->sq_flags, + ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); + } + + if (posted) + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + if (posted) + io_cqring_ev_posted(ctx); + return all_flushed; +} + +static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) +{ + bool ret = true; + + if (test_bit(0, &ctx->check_cq_overflow)) { + /* iopoll syncs against uring_lock, not completion_lock */ + if (ctx->flags & IORING_SETUP_IOPOLL) + mutex_lock(&ctx->uring_lock); + ret = __io_cqring_overflow_flush(ctx, false); + if (ctx->flags & IORING_SETUP_IOPOLL) + mutex_unlock(&ctx->uring_lock); + } + + return ret; +} + +/* must to be called somewhat shortly after putting a request */ +static inline void io_put_task(struct task_struct *task, int nr) +{ + struct io_uring_task *tctx = task->io_uring; + + if (likely(task == current)) { + tctx->cached_refs += nr; + } else { + percpu_counter_sub(&tctx->inflight, nr); + if (unlikely(atomic_read(&tctx->in_idle))) + wake_up(&tctx->wait); + put_task_struct_many(task, nr); + } +} + +static void io_task_refs_refill(struct io_uring_task *tctx) +{ + unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; + + percpu_counter_add(&tctx->inflight, refill); + refcount_add(refill, ¤t->usage); + tctx->cached_refs += refill; +} + +static inline void io_get_task_refs(int nr) +{ + struct io_uring_task *tctx = current->io_uring; + + tctx->cached_refs -= nr; + if (unlikely(tctx->cached_refs < 0)) + io_task_refs_refill(tctx); +} + +static __cold void io_uring_drop_tctx_refs(struct task_struct *task) +{ + struct io_uring_task *tctx = task->io_uring; + unsigned int refs = tctx->cached_refs; + + if (refs) { + tctx->cached_refs = 0; + percpu_counter_sub(&tctx->inflight, refs); + put_task_struct_many(task, refs); + } +} + +static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, + s32 res, u32 cflags) +{ + struct io_overflow_cqe *ocqe; + + ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); + if (!ocqe) { + /* + * If we're in ring overflow flush mode, or in task cancel mode, + * or cannot allocate an overflow entry, then we need to drop it + * on the floor. + */ + io_account_cq_overflow(ctx); + return false; + } + if (list_empty(&ctx->cq_overflow_list)) { + set_bit(0, &ctx->check_cq_overflow); + WRITE_ONCE(ctx->rings->sq_flags, + ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); + + } + ocqe->cqe.user_data = user_data; + ocqe->cqe.res = res; + ocqe->cqe.flags = cflags; + list_add_tail(&ocqe->list, &ctx->cq_overflow_list); + return true; +} + +static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, + s32 res, u32 cflags) +{ + struct io_uring_cqe *cqe; + + trace_io_uring_complete(ctx, user_data, res, cflags); + + /* + * If we can't get a cq entry, userspace overflowed the + * submission (by quite a lot). Increment the overflow count in + * the ring. + */ + cqe = io_get_cqe(ctx); + if (likely(cqe)) { + WRITE_ONCE(cqe->user_data, user_data); + WRITE_ONCE(cqe->res, res); + WRITE_ONCE(cqe->flags, cflags); + return true; + } + return io_cqring_event_overflow(ctx, user_data, res, cflags); +} + +static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) +{ + __io_fill_cqe(req->ctx, req->user_data, res, cflags); +} + +static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, + s32 res, u32 cflags) +{ + ctx->cq_extra++; + return __io_fill_cqe(ctx, user_data, res, cflags); +} + +static void io_req_complete_post(struct io_kiocb *req, s32 res, + u32 cflags) +{ + struct io_ring_ctx *ctx = req->ctx; + + spin_lock(&ctx->completion_lock); + __io_fill_cqe(ctx, req->user_data, res, cflags); + /* + * If we're the last reference to this request, add to our locked + * free_list cache. + */ + if (req_ref_put_and_test(req)) { + if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { + if (req->flags & IO_DISARM_MASK) + io_disarm_next(req); + if (req->link) { + io_req_task_queue(req->link); + req->link = NULL; + } + } + io_dismantle_req(req); + io_put_task(req->task, 1); + list_add(&req->inflight_entry, &ctx->locked_free_list); + ctx->locked_free_nr++; + } else { + if (!percpu_ref_tryget(&ctx->refs)) + req = NULL; + } + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + + if (req) { + io_cqring_ev_posted(ctx); + percpu_ref_put(&ctx->refs); + } +} + +static inline bool io_req_needs_clean(struct io_kiocb *req) +{ + return req->flags & IO_REQ_CLEAN_FLAGS; +} + +static inline void io_req_complete_state(struct io_kiocb *req, s32 res, + u32 cflags) +{ + if (io_req_needs_clean(req)) + io_clean_op(req); + req->result = res; + req->compl.cflags = cflags; + req->flags |= REQ_F_COMPLETE_INLINE; +} + +static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, + s32 res, u32 cflags) +{ + if (issue_flags & IO_URING_F_COMPLETE_DEFER) + io_req_complete_state(req, res, cflags); + else + io_req_complete_post(req, res, cflags); +} + +static inline void io_req_complete(struct io_kiocb *req, s32 res) +{ + __io_req_complete(req, 0, res, 0); +} + +static void io_req_complete_failed(struct io_kiocb *req, s32 res) +{ + req_set_fail(req); + io_req_complete_post(req, res, 0); +} + +static void io_req_complete_fail_submit(struct io_kiocb *req) +{ + /* + * We don't submit, fail them all, for that replace hardlinks with + * normal links. Extra REQ_F_LINK is tolerated. + */ + req->flags &= ~REQ_F_HARDLINK; + req->flags |= REQ_F_LINK; + io_req_complete_failed(req, req->result); +} + +/* + * Don't initialise the fields below on every allocation, but do that in + * advance and keep them valid across allocations. + */ +static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) +{ + req->ctx = ctx; + req->link = NULL; + req->async_data = NULL; + /* not necessary, but safer to zero */ + req->result = 0; +} + +static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, + struct io_submit_state *state) +{ + spin_lock(&ctx->completion_lock); + list_splice_init(&ctx->locked_free_list, &state->free_list); + ctx->locked_free_nr = 0; + spin_unlock(&ctx->completion_lock); +} + +/* Returns true IFF there are requests in the cache */ +static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) +{ + struct io_submit_state *state = &ctx->submit_state; + int nr; + + /* + * If we have more than a batch's worth of requests in our IRQ side + * locked cache, grab the lock and move them over to our submission + * side cache. + */ + if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) + io_flush_cached_locked_reqs(ctx, state); + + nr = state->free_reqs; + while (!list_empty(&state->free_list)) { + struct io_kiocb *req = list_first_entry(&state->free_list, + struct io_kiocb, inflight_entry); + + list_del(&req->inflight_entry); + state->reqs[nr++] = req; + if (nr == ARRAY_SIZE(state->reqs)) + break; + } + + state->free_reqs = nr; + return nr != 0; +} + +/* + * A request might get retired back into the request caches even before opcode + * handlers and io_issue_sqe() are done with it, e.g. inline completion path. + * Because of that, io_alloc_req() should be called only under ->uring_lock + * and with extra caution to not get a request that is still worked on. + */ +static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + struct io_submit_state *state = &ctx->submit_state; + gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; + int ret, i; + + BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); + + if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) + goto got_req; + + ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, + state->reqs); + + /* + * Bulk alloc is all-or-nothing. If we fail to get a batch, + * retry single alloc to be on the safe side. + */ + if (unlikely(ret <= 0)) { + state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); + if (!state->reqs[0]) + return NULL; + ret = 1; + } + + for (i = 0; i < ret; i++) + io_preinit_req(state->reqs[i], ctx); + state->free_reqs = ret; +got_req: + state->free_reqs--; + return state->reqs[state->free_reqs]; +} + +static inline void io_put_file(struct file *file) +{ + if (file) + fput(file); +} + +static void io_dismantle_req(struct io_kiocb *req) +{ + unsigned int flags = req->flags; + + if (io_req_needs_clean(req)) + io_clean_op(req); + if (!(flags & REQ_F_FIXED_FILE)) + io_put_file(req->file); + if (req->fixed_rsrc_refs) + percpu_ref_put(req->fixed_rsrc_refs); + if (req->async_data) { + kfree(req->async_data); + req->async_data = NULL; + } +} + +static void __io_free_req(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + + io_dismantle_req(req); + io_put_task(req->task, 1); + + spin_lock(&ctx->completion_lock); + list_add(&req->inflight_entry, &ctx->locked_free_list); + ctx->locked_free_nr++; + spin_unlock(&ctx->completion_lock); + + percpu_ref_put(&ctx->refs); +} + +static inline void io_remove_next_linked(struct io_kiocb *req) +{ + struct io_kiocb *nxt = req->link; + + req->link = nxt->link; + nxt->link = NULL; +} + +static bool io_kill_linked_timeout(struct io_kiocb *req) + __must_hold(&req->ctx->completion_lock) + __must_hold(&req->ctx->timeout_lock) +{ + struct io_kiocb *link = req->link; + + if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { + struct io_timeout_data *io = link->async_data; + + io_remove_next_linked(req); + link->timeout.head = NULL; + if (hrtimer_try_to_cancel(&io->timer) != -1) { + list_del(&link->timeout.list); + io_fill_cqe_req(link, -ECANCELED, 0); + io_put_req_deferred(link); + return true; + } + } + return false; +} + +static void io_fail_links(struct io_kiocb *req) + __must_hold(&req->ctx->completion_lock) +{ + struct io_kiocb *nxt, *link = req->link; + + req->link = NULL; + while (link) { + long res = -ECANCELED; + + if (link->flags & REQ_F_FAIL) + res = link->result; + + nxt = link->link; + link->link = NULL; + + trace_io_uring_fail_link(req, link); + io_fill_cqe_req(link, res, 0); + io_put_req_deferred(link); + link = nxt; + } +} + +static bool io_disarm_next(struct io_kiocb *req) + __must_hold(&req->ctx->completion_lock) +{ + bool posted = false; + + if (req->flags & REQ_F_ARM_LTIMEOUT) { + struct io_kiocb *link = req->link; + + req->flags &= ~REQ_F_ARM_LTIMEOUT; + if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { + io_remove_next_linked(req); + io_fill_cqe_req(link, -ECANCELED, 0); + io_put_req_deferred(link); + posted = true; + } + } else if (req->flags & REQ_F_LINK_TIMEOUT) { + struct io_ring_ctx *ctx = req->ctx; + + spin_lock_irq(&ctx->timeout_lock); + posted = io_kill_linked_timeout(req); + spin_unlock_irq(&ctx->timeout_lock); + } + if (unlikely((req->flags & REQ_F_FAIL) && + !(req->flags & REQ_F_HARDLINK))) { + posted |= (req->link != NULL); + io_fail_links(req); + } + return posted; +} + +static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) +{ + struct io_kiocb *nxt; + + /* + * If LINK is set, we have dependent requests in this chain. If we + * didn't fail this request, queue the first one up, moving any other + * dependencies to the next request. In case of failure, fail the rest + * of the chain. + */ + if (req->flags & IO_DISARM_MASK) { + struct io_ring_ctx *ctx = req->ctx; + bool posted; + + spin_lock(&ctx->completion_lock); + posted = io_disarm_next(req); + if (posted) + io_commit_cqring(req->ctx); + spin_unlock(&ctx->completion_lock); + if (posted) + io_cqring_ev_posted(ctx); + } + nxt = req->link; + req->link = NULL; + return nxt; +} + +static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) +{ + if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) + return NULL; + return __io_req_find_next(req); +} + +static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) +{ + if (!ctx) + return; + if (*locked) { + if (ctx->submit_state.compl_nr) + io_submit_flush_completions(ctx); + mutex_unlock(&ctx->uring_lock); + *locked = false; + } + percpu_ref_put(&ctx->refs); +} + +static void tctx_task_work(struct callback_head *cb) +{ + bool locked = false; + struct io_ring_ctx *ctx = NULL; + struct io_uring_task *tctx = container_of(cb, struct io_uring_task, + task_work); + + while (1) { + struct io_wq_work_node *node; + + if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr) + io_submit_flush_completions(ctx); + + spin_lock_irq(&tctx->task_lock); + node = tctx->task_list.first; + INIT_WQ_LIST(&tctx->task_list); + if (!node) + tctx->task_running = false; + spin_unlock_irq(&tctx->task_lock); + if (!node) + break; + + do { + struct io_wq_work_node *next = node->next; + struct io_kiocb *req = container_of(node, struct io_kiocb, + io_task_work.node); + + if (req->ctx != ctx) { + ctx_flush_and_put(ctx, &locked); + ctx = req->ctx; + /* if not contended, grab and improve batching */ + locked = mutex_trylock(&ctx->uring_lock); + percpu_ref_get(&ctx->refs); + } + req->io_task_work.func(req, &locked); + node = next; + } while (node); + + cond_resched(); + } + + ctx_flush_and_put(ctx, &locked); + + /* relaxed read is enough as only the task itself sets ->in_idle */ + if (unlikely(atomic_read(&tctx->in_idle))) + io_uring_drop_tctx_refs(current); +} + +static void io_req_task_work_add(struct io_kiocb *req) +{ + struct task_struct *tsk = req->task; + struct io_uring_task *tctx = tsk->io_uring; + enum task_work_notify_mode notify; + struct io_wq_work_node *node; + unsigned long flags; + bool running; + + WARN_ON_ONCE(!tctx); + + spin_lock_irqsave(&tctx->task_lock, flags); + wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); + running = tctx->task_running; + if (!running) + tctx->task_running = true; + spin_unlock_irqrestore(&tctx->task_lock, flags); + + /* task_work already pending, we're done */ + if (running) + return; + + /* + * SQPOLL kernel thread doesn't need notification, just a wakeup. For + * all other cases, use TWA_SIGNAL unconditionally to ensure we're + * processing task_work. There's no reliable way to tell if TWA_RESUME + * will do the job. + */ + notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; + if (!task_work_add(tsk, &tctx->task_work, notify)) { + wake_up_process(tsk); + return; + } + + spin_lock_irqsave(&tctx->task_lock, flags); + tctx->task_running = false; + node = tctx->task_list.first; + INIT_WQ_LIST(&tctx->task_list); + spin_unlock_irqrestore(&tctx->task_lock, flags); + + while (node) { + req = container_of(node, struct io_kiocb, io_task_work.node); + node = node->next; + if (llist_add(&req->io_task_work.fallback_node, + &req->ctx->fallback_llist)) + schedule_delayed_work(&req->ctx->fallback_work, 1); + } +} + +static void io_req_task_cancel(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + + /* not needed for normal modes, but SQPOLL depends on it */ + io_tw_lock(ctx, locked); + io_req_complete_failed(req, req->result); +} + +static void io_req_task_submit(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + + io_tw_lock(ctx, locked); + /* req->task == current here, checking PF_EXITING is safe */ + if (likely(!(req->task->flags & PF_EXITING))) + __io_queue_sqe(req); + else + io_req_complete_failed(req, -EFAULT); +} + +static void io_req_task_queue_fail(struct io_kiocb *req, int ret) +{ + req->result = ret; + req->io_task_work.func = io_req_task_cancel; + io_req_task_work_add(req); +} + +static void io_req_task_queue(struct io_kiocb *req) +{ + req->io_task_work.func = io_req_task_submit; + io_req_task_work_add(req); +} + +static void io_req_task_queue_reissue(struct io_kiocb *req) +{ + req->io_task_work.func = io_queue_async_work; + io_req_task_work_add(req); +} + +static inline void io_queue_next(struct io_kiocb *req) +{ + struct io_kiocb *nxt = io_req_find_next(req); + + if (nxt) + io_req_task_queue(nxt); +} + +static void io_free_req(struct io_kiocb *req) +{ + io_queue_next(req); + __io_free_req(req); +} + +static void io_free_req_work(struct io_kiocb *req, bool *locked) +{ + io_free_req(req); +} + +struct req_batch { + struct task_struct *task; + int task_refs; + int ctx_refs; +}; + +static inline void io_init_req_batch(struct req_batch *rb) +{ + rb->task_refs = 0; + rb->ctx_refs = 0; + rb->task = NULL; +} + +static void io_req_free_batch_finish(struct io_ring_ctx *ctx, + struct req_batch *rb) +{ + if (rb->ctx_refs) + percpu_ref_put_many(&ctx->refs, rb->ctx_refs); + if (rb->task) + io_put_task(rb->task, rb->task_refs); +} + +static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, + struct io_submit_state *state) +{ + io_queue_next(req); + io_dismantle_req(req); + + if (req->task != rb->task) { + if (rb->task) + io_put_task(rb->task, rb->task_refs); + rb->task = req->task; + rb->task_refs = 0; + } + rb->task_refs++; + rb->ctx_refs++; + + if (state->free_reqs != ARRAY_SIZE(state->reqs)) + state->reqs[state->free_reqs++] = req; + else + list_add(&req->inflight_entry, &state->free_list); +} + +static void io_submit_flush_completions(struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + struct io_submit_state *state = &ctx->submit_state; + int i, nr = state->compl_nr; + struct req_batch rb; + + spin_lock(&ctx->completion_lock); + for (i = 0; i < nr; i++) { + struct io_kiocb *req = state->compl_reqs[i]; + + __io_fill_cqe(ctx, req->user_data, req->result, + req->compl.cflags); + } + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + io_cqring_ev_posted(ctx); + + io_init_req_batch(&rb); + for (i = 0; i < nr; i++) { + struct io_kiocb *req = state->compl_reqs[i]; + + if (req_ref_put_and_test(req)) + io_req_free_batch(&rb, req, &ctx->submit_state); + } + + io_req_free_batch_finish(ctx, &rb); + state->compl_nr = 0; +} + +/* + * Drop reference to request, return next in chain (if there is one) if this + * was the last reference to this request. + */ +static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) +{ + struct io_kiocb *nxt = NULL; + + if (req_ref_put_and_test(req)) { + nxt = io_req_find_next(req); + __io_free_req(req); + } + return nxt; +} + +static inline void io_put_req(struct io_kiocb *req) +{ + if (req_ref_put_and_test(req)) + io_free_req(req); +} + +static inline void io_put_req_deferred(struct io_kiocb *req) +{ + if (req_ref_put_and_test(req)) { + req->io_task_work.func = io_free_req_work; + io_req_task_work_add(req); + } +} + +static unsigned io_cqring_events(struct io_ring_ctx *ctx) +{ + /* See comment at the top of this file */ + smp_rmb(); + return __io_cqring_events(ctx); +} + +static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) +{ + struct io_rings *rings = ctx->rings; + + /* make sure SQ entry isn't read before tail */ + return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; +} + +static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) +{ + unsigned int cflags; + + cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; + cflags |= IORING_CQE_F_BUFFER; + req->flags &= ~REQ_F_BUFFER_SELECTED; + kfree(kbuf); + return cflags; +} + +static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) +{ + struct io_buffer *kbuf; + + if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) + return 0; + kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; + return io_put_kbuf(req, kbuf); +} + +static inline bool io_run_task_work(void) +{ + if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { + __set_current_state(TASK_RUNNING); + tracehook_notify_signal(); + return true; + } + + return false; +} + +/* + * Find and free completed poll iocbs + */ +static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, + struct list_head *done) +{ + struct req_batch rb; + struct io_kiocb *req; + + /* order with ->result store in io_complete_rw_iopoll() */ + smp_rmb(); + + io_init_req_batch(&rb); + while (!list_empty(done)) { + req = list_first_entry(done, struct io_kiocb, inflight_entry); + list_del(&req->inflight_entry); + + io_fill_cqe_req(req, req->result, io_put_rw_kbuf(req)); + (*nr_events)++; + + if (req_ref_put_and_test(req)) + io_req_free_batch(&rb, req, &ctx->submit_state); + } + + io_commit_cqring(ctx); + io_cqring_ev_posted_iopoll(ctx); + io_req_free_batch_finish(ctx, &rb); +} + +static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, + long min) +{ + struct io_kiocb *req, *tmp; + LIST_HEAD(done); + bool spin; + + /* + * Only spin for completions if we don't have multiple devices hanging + * off our complete list, and we're under the requested amount. + */ + spin = !ctx->poll_multi_queue && *nr_events < min; + + list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { + struct kiocb *kiocb = &req->rw.kiocb; + int ret; + + /* + * Move completed and retryable entries to our local lists. + * If we find a request that requires polling, break out + * and complete those lists first, if we have entries there. + */ + if (READ_ONCE(req->iopoll_completed)) { + list_move_tail(&req->inflight_entry, &done); + continue; + } + if (!list_empty(&done)) + break; + + ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); + if (unlikely(ret < 0)) + return ret; + else if (ret) + spin = false; + + /* iopoll may have completed current req */ + if (READ_ONCE(req->iopoll_completed)) + list_move_tail(&req->inflight_entry, &done); + } + + if (!list_empty(&done)) + io_iopoll_complete(ctx, nr_events, &done); + + return 0; +} + +/* + * We can't just wait for polled events to come to us, we have to actively + * find and complete them. + */ +static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) +{ + if (!(ctx->flags & IORING_SETUP_IOPOLL)) + return; + + mutex_lock(&ctx->uring_lock); + while (!list_empty(&ctx->iopoll_list)) { + unsigned int nr_events = 0; + + io_do_iopoll(ctx, &nr_events, 0); + + /* let it sleep and repeat later if can't complete a request */ + if (nr_events == 0) + break; + /* + * Ensure we allow local-to-the-cpu processing to take place, + * in this case we need to ensure that we reap all events. + * Also let task_work, etc. to progress by releasing the mutex + */ + if (need_resched()) { + mutex_unlock(&ctx->uring_lock); + cond_resched(); + mutex_lock(&ctx->uring_lock); + } + } + mutex_unlock(&ctx->uring_lock); +} + +static int io_iopoll_check(struct io_ring_ctx *ctx, long min) +{ + unsigned int nr_events = 0; + int ret = 0; + + /* + * We disallow the app entering submit/complete with polling, but we + * still need to lock the ring to prevent racing with polled issue + * that got punted to a workqueue. + */ + mutex_lock(&ctx->uring_lock); + /* + * Don't enter poll loop if we already have events pending. + * If we do, we can potentially be spinning for commands that + * already triggered a CQE (eg in error). + */ + if (test_bit(0, &ctx->check_cq_overflow)) + __io_cqring_overflow_flush(ctx, false); + if (io_cqring_events(ctx)) + goto out; + do { + /* + * If a submit got punted to a workqueue, we can have the + * application entering polling for a command before it gets + * issued. That app will hold the uring_lock for the duration + * of the poll right here, so we need to take a breather every + * now and then to ensure that the issue has a chance to add + * the poll to the issued list. Otherwise we can spin here + * forever, while the workqueue is stuck trying to acquire the + * very same mutex. + */ + if (list_empty(&ctx->iopoll_list)) { + u32 tail = ctx->cached_cq_tail; + + mutex_unlock(&ctx->uring_lock); + io_run_task_work(); + mutex_lock(&ctx->uring_lock); + + /* some requests don't go through iopoll_list */ + if (tail != ctx->cached_cq_tail || + list_empty(&ctx->iopoll_list)) + break; + } + ret = io_do_iopoll(ctx, &nr_events, min); + } while (!ret && nr_events < min && !need_resched()); +out: + mutex_unlock(&ctx->uring_lock); + return ret; +} + +static void kiocb_end_write(struct io_kiocb *req) +{ + /* + * Tell lockdep we inherited freeze protection from submission + * thread. + */ + if (req->flags & REQ_F_ISREG) { + struct super_block *sb = file_inode(req->file)->i_sb; + + __sb_writers_acquired(sb, SB_FREEZE_WRITE); + sb_end_write(sb); + } +} + +#ifdef CONFIG_BLOCK +static bool io_resubmit_prep(struct io_kiocb *req) +{ + struct io_async_rw *rw = req->async_data; + + if (!rw) + return !io_req_prep_async(req); + iov_iter_restore(&rw->iter, &rw->iter_state); + return true; +} + +static bool io_rw_should_reissue(struct io_kiocb *req) +{ + umode_t mode = file_inode(req->file)->i_mode; + struct io_ring_ctx *ctx = req->ctx; + + if (!S_ISBLK(mode) && !S_ISREG(mode)) + return false; + if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && + !(ctx->flags & IORING_SETUP_IOPOLL))) + return false; + /* + * If ref is dying, we might be running poll reap from the exit work. + * Don't attempt to reissue from that path, just let it fail with + * -EAGAIN. + */ + if (percpu_ref_is_dying(&ctx->refs)) + return false; + /* + * Play it safe and assume not safe to re-import and reissue if we're + * not in the original thread group (or in task context). + */ + if (!same_thread_group(req->task, current) || !in_task()) + return false; + return true; +} +#else +static bool io_resubmit_prep(struct io_kiocb *req) +{ + return false; +} +static bool io_rw_should_reissue(struct io_kiocb *req) +{ + return false; +} +#endif + +static bool __io_complete_rw_common(struct io_kiocb *req, long res) +{ + if (req->rw.kiocb.ki_flags & IOCB_WRITE) { + kiocb_end_write(req); + fsnotify_modify(req->file); + } else { + fsnotify_access(req->file); + } + if (res != req->result) { + if ((res == -EAGAIN || res == -EOPNOTSUPP) && + io_rw_should_reissue(req)) { + req->flags |= REQ_F_REISSUE; + return true; + } + req_set_fail(req); + req->result = res; + } + return false; +} + +static inline int io_fixup_rw_res(struct io_kiocb *req, unsigned res) +{ + struct io_async_rw *io = req->async_data; + + /* add previously done IO, if any */ + if (io && io->bytes_done > 0) { + if (res < 0) + res = io->bytes_done; + else + res += io->bytes_done; + } + return res; +} + +static void io_req_task_complete(struct io_kiocb *req, bool *locked) +{ + unsigned int cflags = io_put_rw_kbuf(req); + int res = req->result; + + if (*locked) { + struct io_ring_ctx *ctx = req->ctx; + struct io_submit_state *state = &ctx->submit_state; + + io_req_complete_state(req, res, cflags); + state->compl_reqs[state->compl_nr++] = req; + if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) + io_submit_flush_completions(ctx); + } else { + io_req_complete_post(req, res, cflags); + } +} + +static void __io_complete_rw(struct io_kiocb *req, long res, long res2, + unsigned int issue_flags) +{ + if (__io_complete_rw_common(req, res)) + return; + __io_req_complete(req, issue_flags, io_fixup_rw_res(req, res), io_put_rw_kbuf(req)); +} + +static void io_complete_rw(struct kiocb *kiocb, long res, long res2) +{ + struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); + + if (__io_complete_rw_common(req, res)) + return; + req->result = io_fixup_rw_res(req, res); + req->io_task_work.func = io_req_task_complete; + io_req_task_work_add(req); +} + +static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) +{ + struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); + + if (kiocb->ki_flags & IOCB_WRITE) + kiocb_end_write(req); + if (unlikely(res != req->result)) { + if (res == -EAGAIN && io_rw_should_reissue(req)) { + req->flags |= REQ_F_REISSUE; + return; + } + } + + WRITE_ONCE(req->result, res); + /* order with io_iopoll_complete() checking ->result */ + smp_wmb(); + WRITE_ONCE(req->iopoll_completed, 1); +} + +/* + * After the iocb has been issued, it's safe to be found on the poll list. + * Adding the kiocb to the list AFTER submission ensures that we don't + * find it from a io_do_iopoll() thread before the issuer is done + * accessing the kiocb cookie. + */ +static void io_iopoll_req_issued(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + const bool in_async = io_wq_current_is_worker(); + + /* workqueue context doesn't hold uring_lock, grab it now */ + if (unlikely(in_async)) + mutex_lock(&ctx->uring_lock); + + /* + * Track whether we have multiple files in our lists. This will impact + * how we do polling eventually, not spinning if we're on potentially + * different devices. + */ + if (list_empty(&ctx->iopoll_list)) { + ctx->poll_multi_queue = false; + } else if (!ctx->poll_multi_queue) { + struct io_kiocb *list_req; + unsigned int queue_num0, queue_num1; + + list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, + inflight_entry); + + if (list_req->file != req->file) { + ctx->poll_multi_queue = true; + } else { + queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); + queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); + if (queue_num0 != queue_num1) + ctx->poll_multi_queue = true; + } + } + + /* + * For fast devices, IO may have already completed. If it has, add + * it to the front so we find it first. + */ + if (READ_ONCE(req->iopoll_completed)) + list_add(&req->inflight_entry, &ctx->iopoll_list); + else + list_add_tail(&req->inflight_entry, &ctx->iopoll_list); + + if (unlikely(in_async)) { + /* + * If IORING_SETUP_SQPOLL is enabled, sqes are either handle + * in sq thread task context or in io worker task context. If + * current task context is sq thread, we don't need to check + * whether should wake up sq thread. + */ + if ((ctx->flags & IORING_SETUP_SQPOLL) && + wq_has_sleeper(&ctx->sq_data->wait)) + wake_up(&ctx->sq_data->wait); + + mutex_unlock(&ctx->uring_lock); + } +} + +static bool io_bdev_nowait(struct block_device *bdev) +{ + return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); +} + +/* + * If we tracked the file through the SCM inflight mechanism, we could support + * any file. For now, just ensure that anything potentially problematic is done + * inline. + */ +static bool __io_file_supports_nowait(struct file *file, int rw) +{ + umode_t mode = file_inode(file)->i_mode; + + if (S_ISBLK(mode)) { + if (IS_ENABLED(CONFIG_BLOCK) && + io_bdev_nowait(I_BDEV(file->f_mapping->host))) + return true; + return false; + } + if (S_ISSOCK(mode)) + return true; + if (S_ISREG(mode)) { + if (IS_ENABLED(CONFIG_BLOCK) && + io_bdev_nowait(file->f_inode->i_sb->s_bdev) && + file->f_op != &io_uring_fops) + return true; + return false; + } + + /* any ->read/write should understand O_NONBLOCK */ + if (file->f_flags & O_NONBLOCK) + return true; + + if (!(file->f_mode & FMODE_NOWAIT)) + return false; + + if (rw == READ) + return file->f_op->read_iter != NULL; + + return file->f_op->write_iter != NULL; +} + +static bool io_file_supports_nowait(struct io_kiocb *req, int rw) +{ + if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) + return true; + else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) + return true; + + return __io_file_supports_nowait(req->file, rw); +} + +static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, + int rw) +{ + struct io_ring_ctx *ctx = req->ctx; + struct kiocb *kiocb = &req->rw.kiocb; + struct file *file = req->file; + unsigned ioprio; + int ret; + + if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) + req->flags |= REQ_F_ISREG; + + kiocb->ki_pos = READ_ONCE(sqe->off); + if (kiocb->ki_pos == -1) { + if (!(file->f_mode & FMODE_STREAM)) { + req->flags |= REQ_F_CUR_POS; + kiocb->ki_pos = file->f_pos; + } else { + kiocb->ki_pos = 0; + } + } + kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); + kiocb->ki_flags = iocb_flags(kiocb->ki_filp); + ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); + if (unlikely(ret)) + return ret; + + /* + * If the file is marked O_NONBLOCK, still allow retry for it if it + * supports async. Otherwise it's impossible to use O_NONBLOCK files + * reliably. If not, or it IOCB_NOWAIT is set, don't retry. + */ + if ((kiocb->ki_flags & IOCB_NOWAIT) || + ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req, rw))) + req->flags |= REQ_F_NOWAIT; + + ioprio = READ_ONCE(sqe->ioprio); + if (ioprio) { + ret = ioprio_check_cap(ioprio); + if (ret) + return ret; + + kiocb->ki_ioprio = ioprio; + } else + kiocb->ki_ioprio = get_current_ioprio(); + + if (ctx->flags & IORING_SETUP_IOPOLL) { + if (!(kiocb->ki_flags & IOCB_DIRECT) || + !kiocb->ki_filp->f_op->iopoll) + return -EOPNOTSUPP; + + kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; + kiocb->ki_complete = io_complete_rw_iopoll; + req->iopoll_completed = 0; + } else { + if (kiocb->ki_flags & IOCB_HIPRI) + return -EINVAL; + kiocb->ki_complete = io_complete_rw; + } + + /* used for fixed read/write too - just read unconditionally */ + req->buf_index = READ_ONCE(sqe->buf_index); + req->imu = NULL; + + if (req->opcode == IORING_OP_READ_FIXED || + req->opcode == IORING_OP_WRITE_FIXED) { + struct io_ring_ctx *ctx = req->ctx; + u16 index; + + if (unlikely(req->buf_index >= ctx->nr_user_bufs)) + return -EFAULT; + index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); + req->imu = ctx->user_bufs[index]; + io_req_set_rsrc_node(req); + } + + req->rw.addr = READ_ONCE(sqe->addr); + req->rw.len = READ_ONCE(sqe->len); + return 0; +} + +static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) +{ + switch (ret) { + case -EIOCBQUEUED: + break; + case -ERESTARTSYS: + case -ERESTARTNOINTR: + case -ERESTARTNOHAND: + case -ERESTART_RESTARTBLOCK: + /* + * We can't just restart the syscall, since previously + * submitted sqes may already be in progress. Just fail this + * IO with EINTR. + */ + ret = -EINTR; + fallthrough; + default: + kiocb->ki_complete(kiocb, ret, 0); + } +} + +static void kiocb_done(struct kiocb *kiocb, ssize_t ret, + unsigned int issue_flags) +{ + struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); + + if (req->flags & REQ_F_CUR_POS) + req->file->f_pos = kiocb->ki_pos; + if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) + __io_complete_rw(req, ret, 0, issue_flags); + else + io_rw_done(kiocb, ret); + + if (req->flags & REQ_F_REISSUE) { + req->flags &= ~REQ_F_REISSUE; + if (io_resubmit_prep(req)) { + io_req_task_queue_reissue(req); + } else { + unsigned int cflags = io_put_rw_kbuf(req); + struct io_ring_ctx *ctx = req->ctx; + + ret = io_fixup_rw_res(req, ret); + req_set_fail(req); + if (!(issue_flags & IO_URING_F_NONBLOCK)) { + mutex_lock(&ctx->uring_lock); + __io_req_complete(req, issue_flags, ret, cflags); + mutex_unlock(&ctx->uring_lock); + } else { + __io_req_complete(req, issue_flags, ret, cflags); + } + } + } +} + +static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, + struct io_mapped_ubuf *imu) +{ + size_t len = req->rw.len; + u64 buf_end, buf_addr = req->rw.addr; + size_t offset; + + if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) + return -EFAULT; + /* not inside the mapped region */ + if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) + return -EFAULT; + + /* + * May not be a start of buffer, set size appropriately + * and advance us to the beginning. + */ + offset = buf_addr - imu->ubuf; + iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); + + if (offset) { + /* + * Don't use iov_iter_advance() here, as it's really slow for + * using the latter parts of a big fixed buffer - it iterates + * over each segment manually. We can cheat a bit here, because + * we know that: + * + * 1) it's a BVEC iter, we set it up + * 2) all bvecs are PAGE_SIZE in size, except potentially the + * first and last bvec + * + * So just find our index, and adjust the iterator afterwards. + * If the offset is within the first bvec (or the whole first + * bvec, just use iov_iter_advance(). This makes it easier + * since we can just skip the first segment, which may not + * be PAGE_SIZE aligned. + */ + const struct bio_vec *bvec = imu->bvec; + + if (offset <= bvec->bv_len) { + iov_iter_advance(iter, offset); + } else { + unsigned long seg_skip; + + /* skip first vec */ + offset -= bvec->bv_len; + seg_skip = 1 + (offset >> PAGE_SHIFT); + + iter->bvec = bvec + seg_skip; + iter->nr_segs -= seg_skip; + iter->count -= bvec->bv_len + offset; + iter->iov_offset = offset & ~PAGE_MASK; + } + } + + return 0; +} + +static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) +{ + if (WARN_ON_ONCE(!req->imu)) + return -EFAULT; + return __io_import_fixed(req, rw, iter, req->imu); +} + +static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) +{ + if (needs_lock) + mutex_unlock(&ctx->uring_lock); +} + +static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) +{ + /* + * "Normal" inline submissions always hold the uring_lock, since we + * grab it from the system call. Same is true for the SQPOLL offload. + * The only exception is when we've detached the request and issue it + * from an async worker thread, grab the lock for that case. + */ + if (needs_lock) + mutex_lock(&ctx->uring_lock); +} + +static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, + int bgid, struct io_buffer *kbuf, + bool needs_lock) +{ + struct io_buffer *head; + + if (req->flags & REQ_F_BUFFER_SELECTED) + return kbuf; + + io_ring_submit_lock(req->ctx, needs_lock); + + lockdep_assert_held(&req->ctx->uring_lock); + + head = xa_load(&req->ctx->io_buffers, bgid); + if (head) { + if (!list_empty(&head->list)) { + kbuf = list_last_entry(&head->list, struct io_buffer, + list); + list_del(&kbuf->list); + } else { + kbuf = head; + xa_erase(&req->ctx->io_buffers, bgid); + } + if (*len > kbuf->len) + *len = kbuf->len; + } else { + kbuf = ERR_PTR(-ENOBUFS); + } + + io_ring_submit_unlock(req->ctx, needs_lock); + + return kbuf; +} + +static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, + bool needs_lock) +{ + struct io_buffer *kbuf; + u16 bgid; + + kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; + bgid = req->buf_index; + kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); + if (IS_ERR(kbuf)) + return kbuf; + req->rw.addr = (u64) (unsigned long) kbuf; + req->flags |= REQ_F_BUFFER_SELECTED; + return u64_to_user_ptr(kbuf->addr); +} + +#ifdef CONFIG_COMPAT +static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, + bool needs_lock) +{ + struct compat_iovec __user *uiov; + compat_ssize_t clen; + void __user *buf; + ssize_t len; + + uiov = u64_to_user_ptr(req->rw.addr); + if (!access_ok(uiov, sizeof(*uiov))) + return -EFAULT; + if (__get_user(clen, &uiov->iov_len)) + return -EFAULT; + if (clen < 0) + return -EINVAL; + + len = clen; + buf = io_rw_buffer_select(req, &len, needs_lock); + if (IS_ERR(buf)) + return PTR_ERR(buf); + iov[0].iov_base = buf; + iov[0].iov_len = (compat_size_t) len; + return 0; +} +#endif + +static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, + bool needs_lock) +{ + struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); + void __user *buf; + ssize_t len; + + if (copy_from_user(iov, uiov, sizeof(*uiov))) + return -EFAULT; + + len = iov[0].iov_len; + if (len < 0) + return -EINVAL; + buf = io_rw_buffer_select(req, &len, needs_lock); + if (IS_ERR(buf)) + return PTR_ERR(buf); + iov[0].iov_base = buf; + iov[0].iov_len = len; + return 0; +} + +static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, + bool needs_lock) +{ + if (req->flags & REQ_F_BUFFER_SELECTED) { + struct io_buffer *kbuf; + + kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; + iov[0].iov_base = u64_to_user_ptr(kbuf->addr); + iov[0].iov_len = kbuf->len; + return 0; + } + if (req->rw.len != 1) + return -EINVAL; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + return io_compat_import(req, iov, needs_lock); +#endif + + return __io_iov_buffer_select(req, iov, needs_lock); +} + +static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, + struct iov_iter *iter, bool needs_lock) +{ + void __user *buf = u64_to_user_ptr(req->rw.addr); + size_t sqe_len = req->rw.len; + u8 opcode = req->opcode; + ssize_t ret; + + if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { + *iovec = NULL; + return io_import_fixed(req, rw, iter); + } + + /* buffer index only valid with fixed read/write, or buffer select */ + if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) + return -EINVAL; + + if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { + if (req->flags & REQ_F_BUFFER_SELECT) { + buf = io_rw_buffer_select(req, &sqe_len, needs_lock); + if (IS_ERR(buf)) + return PTR_ERR(buf); + req->rw.len = sqe_len; + } + + ret = import_single_range(rw, buf, sqe_len, *iovec, iter); + *iovec = NULL; + return ret; + } + + if (req->flags & REQ_F_BUFFER_SELECT) { + ret = io_iov_buffer_select(req, *iovec, needs_lock); + if (!ret) + iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); + *iovec = NULL; + return ret; + } + + return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, + req->ctx->compat); +} + +static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) +{ + return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; +} + +/* + * For files that don't have ->read_iter() and ->write_iter(), handle them + * by looping over ->read() or ->write() manually. + */ +static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) +{ + struct kiocb *kiocb = &req->rw.kiocb; + struct file *file = req->file; + ssize_t ret = 0; + + /* + * Don't support polled IO through this interface, and we can't + * support non-blocking either. For the latter, this just causes + * the kiocb to be handled from an async context. + */ + if (kiocb->ki_flags & IOCB_HIPRI) + return -EOPNOTSUPP; + if (kiocb->ki_flags & IOCB_NOWAIT) + return -EAGAIN; + + while (iov_iter_count(iter)) { + struct iovec iovec; + ssize_t nr; + + if (!iov_iter_is_bvec(iter)) { + iovec = iov_iter_iovec(iter); + } else { + iovec.iov_base = u64_to_user_ptr(req->rw.addr); + iovec.iov_len = req->rw.len; + } + + if (rw == READ) { + nr = file->f_op->read(file, iovec.iov_base, + iovec.iov_len, io_kiocb_ppos(kiocb)); + } else { + nr = file->f_op->write(file, iovec.iov_base, + iovec.iov_len, io_kiocb_ppos(kiocb)); + } + + if (nr < 0) { + if (!ret) + ret = nr; + break; + } + ret += nr; + if (!iov_iter_is_bvec(iter)) { + iov_iter_advance(iter, nr); + } else { + req->rw.addr += nr; + req->rw.len -= nr; + if (!req->rw.len) + break; + } + if (nr != iovec.iov_len) + break; + } + + return ret; +} + +static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, + const struct iovec *fast_iov, struct iov_iter *iter) +{ + struct io_async_rw *rw = req->async_data; + + memcpy(&rw->iter, iter, sizeof(*iter)); + rw->free_iovec = iovec; + rw->bytes_done = 0; + /* can only be fixed buffers, no need to do anything */ + if (iov_iter_is_bvec(iter)) + return; + if (!iovec) { + unsigned iov_off = 0; + + rw->iter.iov = rw->fast_iov; + if (iter->iov != fast_iov) { + iov_off = iter->iov - fast_iov; + rw->iter.iov += iov_off; + } + if (rw->fast_iov != fast_iov) + memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, + sizeof(struct iovec) * iter->nr_segs); + } else { + req->flags |= REQ_F_NEED_CLEANUP; + } +} + +static inline int io_alloc_async_data(struct io_kiocb *req) +{ + WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); + req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); + return req->async_data == NULL; +} + +static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, + const struct iovec *fast_iov, + struct iov_iter *iter, bool force) +{ + if (!force && !io_op_defs[req->opcode].needs_async_setup) + return 0; + if (!req->async_data) { + struct io_async_rw *iorw; + + if (io_alloc_async_data(req)) { + kfree(iovec); + return -ENOMEM; + } + + io_req_map_rw(req, iovec, fast_iov, iter); + iorw = req->async_data; + /* we've copied and mapped the iter, ensure state is saved */ + iov_iter_save_state(&iorw->iter, &iorw->iter_state); + } + return 0; +} + +static inline int io_rw_prep_async(struct io_kiocb *req, int rw) +{ + struct io_async_rw *iorw = req->async_data; + struct iovec *iov = iorw->fast_iov; + int ret; + + ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); + if (unlikely(ret < 0)) + return ret; + + iorw->bytes_done = 0; + iorw->free_iovec = iov; + if (iov) + req->flags |= REQ_F_NEED_CLEANUP; + iov_iter_save_state(&iorw->iter, &iorw->iter_state); + return 0; +} + +static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + if (unlikely(!(req->file->f_mode & FMODE_READ))) + return -EBADF; + return io_prep_rw(req, sqe, READ); +} + +/* + * This is our waitqueue callback handler, registered through lock_page_async() + * when we initially tried to do the IO with the iocb armed our waitqueue. + * This gets called when the page is unlocked, and we generally expect that to + * happen when the page IO is completed and the page is now uptodate. This will + * queue a task_work based retry of the operation, attempting to copy the data + * again. If the latter fails because the page was NOT uptodate, then we will + * do a thread based blocking retry of the operation. That's the unexpected + * slow path. + */ +static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, + int sync, void *arg) +{ + struct wait_page_queue *wpq; + struct io_kiocb *req = wait->private; + struct wait_page_key *key = arg; + + wpq = container_of(wait, struct wait_page_queue, wait); + + if (!wake_page_match(wpq, key)) + return 0; + + req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; + list_del_init(&wait->entry); + io_req_task_queue(req); + return 1; +} + +/* + * This controls whether a given IO request should be armed for async page + * based retry. If we return false here, the request is handed to the async + * worker threads for retry. If we're doing buffered reads on a regular file, + * we prepare a private wait_page_queue entry and retry the operation. This + * will either succeed because the page is now uptodate and unlocked, or it + * will register a callback when the page is unlocked at IO completion. Through + * that callback, io_uring uses task_work to setup a retry of the operation. + * That retry will attempt the buffered read again. The retry will generally + * succeed, or in rare cases where it fails, we then fall back to using the + * async worker threads for a blocking retry. + */ +static bool io_rw_should_retry(struct io_kiocb *req) +{ + struct io_async_rw *rw = req->async_data; + struct wait_page_queue *wait = &rw->wpq; + struct kiocb *kiocb = &req->rw.kiocb; + + /* never retry for NOWAIT, we just complete with -EAGAIN */ + if (req->flags & REQ_F_NOWAIT) + return false; + + /* Only for buffered IO */ + if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) + return false; + + /* + * just use poll if we can, and don't attempt if the fs doesn't + * support callback based unlocks + */ + if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) + return false; + + wait->wait.func = io_async_buf_func; + wait->wait.private = req; + wait->wait.flags = 0; + INIT_LIST_HEAD(&wait->wait.entry); + kiocb->ki_flags |= IOCB_WAITQ; + kiocb->ki_flags &= ~IOCB_NOWAIT; + kiocb->ki_waitq = wait; + return true; +} + +static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) +{ + if (req->file->f_op->read_iter) + return call_read_iter(req->file, &req->rw.kiocb, iter); + else if (req->file->f_op->read) + return loop_rw_iter(READ, req, iter); + else + return -EINVAL; +} + +static bool need_read_all(struct io_kiocb *req) +{ + return req->flags & REQ_F_ISREG || + S_ISBLK(file_inode(req->file)->i_mode); +} + +static int io_read(struct io_kiocb *req, unsigned int issue_flags) +{ + struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; + struct kiocb *kiocb = &req->rw.kiocb; + struct iov_iter __iter, *iter = &__iter; + struct io_async_rw *rw = req->async_data; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + struct iov_iter_state __state, *state; + ssize_t ret, ret2; + + if (rw) { + iter = &rw->iter; + state = &rw->iter_state; + /* + * We come here from an earlier attempt, restore our state to + * match in case it doesn't. It's cheap enough that we don't + * need to make this conditional. + */ + iov_iter_restore(iter, state); + iovec = NULL; + } else { + ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); + if (ret < 0) + return ret; + state = &__state; + iov_iter_save_state(iter, state); + } + req->result = iov_iter_count(iter); + + /* Ensure we clear previously set non-block flag */ + if (!force_nonblock) + kiocb->ki_flags &= ~IOCB_NOWAIT; + else + kiocb->ki_flags |= IOCB_NOWAIT; + + /* If the file doesn't support async, just async punt */ + if (force_nonblock && !io_file_supports_nowait(req, READ)) { + ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); + return ret ?: -EAGAIN; + } + + ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); + if (unlikely(ret)) { + kfree(iovec); + return ret; + } + + ret = io_iter_do_read(req, iter); + + if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { + req->flags &= ~REQ_F_REISSUE; + /* IOPOLL retry should happen for io-wq threads */ + if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) + goto done; + /* no retry on NONBLOCK nor RWF_NOWAIT */ + if (req->flags & REQ_F_NOWAIT) + goto done; + ret = 0; + } else if (ret == -EIOCBQUEUED) { + goto out_free; + } else if (ret <= 0 || ret == req->result || !force_nonblock || + (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { + /* read all, failed, already did sync or don't want to retry */ + goto done; + } + + /* + * Don't depend on the iter state matching what was consumed, or being + * untouched in case of error. Restore it and we'll advance it + * manually if we need to. + */ + iov_iter_restore(iter, state); + + ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); + if (ret2) + return ret2; + + iovec = NULL; + rw = req->async_data; + /* + * Now use our persistent iterator and state, if we aren't already. + * We've restored and mapped the iter to match. + */ + if (iter != &rw->iter) { + iter = &rw->iter; + state = &rw->iter_state; + } + + do { + /* + * We end up here because of a partial read, either from + * above or inside this loop. Advance the iter by the bytes + * that were consumed. + */ + iov_iter_advance(iter, ret); + if (!iov_iter_count(iter)) + break; + rw->bytes_done += ret; + iov_iter_save_state(iter, state); + + /* if we can retry, do so with the callbacks armed */ + if (!io_rw_should_retry(req)) { + kiocb->ki_flags &= ~IOCB_WAITQ; + return -EAGAIN; + } + + req->result = iov_iter_count(iter); + /* + * Now retry read with the IOCB_WAITQ parts set in the iocb. If + * we get -EIOCBQUEUED, then we'll get a notification when the + * desired page gets unlocked. We can also get a partial read + * here, and if we do, then just retry at the new offset. + */ + ret = io_iter_do_read(req, iter); + if (ret == -EIOCBQUEUED) + return 0; + /* we got some bytes, but not all. retry. */ + kiocb->ki_flags &= ~IOCB_WAITQ; + iov_iter_restore(iter, state); + } while (ret > 0); +done: + kiocb_done(kiocb, ret, issue_flags); +out_free: + /* it's faster to check here then delegate to kfree */ + if (iovec) + kfree(iovec); + return 0; +} + +static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + if (unlikely(!(req->file->f_mode & FMODE_WRITE))) + return -EBADF; + return io_prep_rw(req, sqe, WRITE); +} + +static int io_write(struct io_kiocb *req, unsigned int issue_flags) +{ + struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; + struct kiocb *kiocb = &req->rw.kiocb; + struct iov_iter __iter, *iter = &__iter; + struct io_async_rw *rw = req->async_data; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + struct iov_iter_state __state, *state; + ssize_t ret, ret2; + + if (rw) { + iter = &rw->iter; + state = &rw->iter_state; + iov_iter_restore(iter, state); + iovec = NULL; + } else { + ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); + if (ret < 0) + return ret; + state = &__state; + iov_iter_save_state(iter, state); + } + req->result = iov_iter_count(iter); + + /* Ensure we clear previously set non-block flag */ + if (!force_nonblock) + kiocb->ki_flags &= ~IOCB_NOWAIT; + else + kiocb->ki_flags |= IOCB_NOWAIT; + + /* If the file doesn't support async, just async punt */ + if (force_nonblock && !io_file_supports_nowait(req, WRITE)) + goto copy_iov; + + /* file path doesn't support NOWAIT for non-direct_IO */ + if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && + (req->flags & REQ_F_ISREG)) + goto copy_iov; + + ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); + if (unlikely(ret)) + goto out_free; + + /* + * Open-code file_start_write here to grab freeze protection, + * which will be released by another thread in + * io_complete_rw(). Fool lockdep by telling it the lock got + * released so that it doesn't complain about the held lock when + * we return to userspace. + */ + if (req->flags & REQ_F_ISREG) { + sb_start_write(file_inode(req->file)->i_sb); + __sb_writers_release(file_inode(req->file)->i_sb, + SB_FREEZE_WRITE); + } + kiocb->ki_flags |= IOCB_WRITE; + + if (req->file->f_op->write_iter) + ret2 = call_write_iter(req->file, kiocb, iter); + else if (req->file->f_op->write) + ret2 = loop_rw_iter(WRITE, req, iter); + else + ret2 = -EINVAL; + + if (req->flags & REQ_F_REISSUE) { + req->flags &= ~REQ_F_REISSUE; + ret2 = -EAGAIN; + } + + /* + * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just + * retry them without IOCB_NOWAIT. + */ + if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) + ret2 = -EAGAIN; + /* no retry on NONBLOCK nor RWF_NOWAIT */ + if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) + goto done; + if (!force_nonblock || ret2 != -EAGAIN) { + /* IOPOLL retry should happen for io-wq threads */ + if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) + goto copy_iov; +done: + kiocb_done(kiocb, ret2, issue_flags); + } else { +copy_iov: + iov_iter_restore(iter, state); + ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); + if (!ret) { + if (kiocb->ki_flags & IOCB_WRITE) + kiocb_end_write(req); + return -EAGAIN; + } + return ret; + } +out_free: + /* it's reportedly faster than delegating the null check to kfree() */ + if (iovec) + kfree(iovec); + return ret; +} + +static int io_renameat_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_rename *ren = &req->rename; + const char __user *oldf, *newf; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + ren->old_dfd = READ_ONCE(sqe->fd); + oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); + newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + ren->new_dfd = READ_ONCE(sqe->len); + ren->flags = READ_ONCE(sqe->rename_flags); + + ren->oldpath = getname(oldf); + if (IS_ERR(ren->oldpath)) + return PTR_ERR(ren->oldpath); + + ren->newpath = getname(newf); + if (IS_ERR(ren->newpath)) { + putname(ren->oldpath); + return PTR_ERR(ren->newpath); + } + + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_rename *ren = &req->rename; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, + ren->newpath, ren->flags); + + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_unlinkat_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_unlink *un = &req->unlink; + const char __user *fname; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || + sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + un->dfd = READ_ONCE(sqe->fd); + + un->flags = READ_ONCE(sqe->unlink_flags); + if (un->flags & ~AT_REMOVEDIR) + return -EINVAL; + + fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); + un->filename = getname(fname); + if (IS_ERR(un->filename)) + return PTR_ERR(un->filename); + + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_unlink *un = &req->unlink; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + if (un->flags & AT_REMOVEDIR) + ret = do_rmdir(un->dfd, un->filename); + else + ret = do_unlinkat(un->dfd, un->filename); + + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_mkdirat_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_mkdir *mkd = &req->mkdir; + const char __user *fname; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || + sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + mkd->dfd = READ_ONCE(sqe->fd); + mkd->mode = READ_ONCE(sqe->len); + + fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); + mkd->filename = getname(fname); + if (IS_ERR(mkd->filename)) + return PTR_ERR(mkd->filename); + + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_mkdirat(struct io_kiocb *req, int issue_flags) +{ + struct io_mkdir *mkd = &req->mkdir; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); + + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_symlinkat_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_symlink *sl = &req->symlink; + const char __user *oldpath, *newpath; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || + sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + sl->new_dfd = READ_ONCE(sqe->fd); + oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); + newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + + sl->oldpath = getname(oldpath); + if (IS_ERR(sl->oldpath)) + return PTR_ERR(sl->oldpath); + + sl->newpath = getname(newpath); + if (IS_ERR(sl->newpath)) { + putname(sl->oldpath); + return PTR_ERR(sl->newpath); + } + + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_symlinkat(struct io_kiocb *req, int issue_flags) +{ + struct io_symlink *sl = &req->symlink; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); + + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_linkat_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_hardlink *lnk = &req->hardlink; + const char __user *oldf, *newf; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + lnk->old_dfd = READ_ONCE(sqe->fd); + lnk->new_dfd = READ_ONCE(sqe->len); + oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); + newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + lnk->flags = READ_ONCE(sqe->hardlink_flags); + + lnk->oldpath = getname(oldf); + if (IS_ERR(lnk->oldpath)) + return PTR_ERR(lnk->oldpath); + + lnk->newpath = getname(newf); + if (IS_ERR(lnk->newpath)) { + putname(lnk->oldpath); + return PTR_ERR(lnk->newpath); + } + + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_linkat(struct io_kiocb *req, int issue_flags) +{ + struct io_hardlink *lnk = &req->hardlink; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, + lnk->newpath, lnk->flags); + + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_shutdown_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ +#if defined(CONFIG_NET) + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || + sqe->buf_index || sqe->splice_fd_in)) + return -EINVAL; + + req->shutdown.how = READ_ONCE(sqe->len); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) +{ +#if defined(CONFIG_NET) + struct socket *sock; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + ret = __sys_shutdown_sock(sock, req->shutdown.how); + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int __io_splice_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_splice *sp = &req->splice; + unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + sp->len = READ_ONCE(sqe->len); + sp->flags = READ_ONCE(sqe->splice_flags); + if (unlikely(sp->flags & ~valid_flags)) + return -EINVAL; + sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); + return 0; +} + +static int io_tee_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) + return -EINVAL; + return __io_splice_prep(req, sqe); +} + +static int io_tee(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_splice *sp = &req->splice; + struct file *out = sp->file_out; + unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; + struct file *in; + long ret = 0; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + in = io_file_get(req->ctx, req, sp->splice_fd_in, + (sp->flags & SPLICE_F_FD_IN_FIXED)); + if (!in) { + ret = -EBADF; + goto done; + } + + if (sp->len) + ret = do_tee(in, out, sp->len, flags); + + if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) + io_put_file(in); +done: + if (ret != sp->len) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_splice *sp = &req->splice; + + sp->off_in = READ_ONCE(sqe->splice_off_in); + sp->off_out = READ_ONCE(sqe->off); + return __io_splice_prep(req, sqe); +} + +static int io_splice(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_splice *sp = &req->splice; + struct file *out = sp->file_out; + unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; + loff_t *poff_in, *poff_out; + struct file *in; + long ret = 0; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + in = io_file_get(req->ctx, req, sp->splice_fd_in, + (sp->flags & SPLICE_F_FD_IN_FIXED)); + if (!in) { + ret = -EBADF; + goto done; + } + + poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; + poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; + + if (sp->len) + ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); + + if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) + io_put_file(in); +done: + if (ret != sp->len) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +/* + * IORING_OP_NOP just posts a completion event, nothing else. + */ +static int io_nop(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + __io_req_complete(req, issue_flags, 0, 0); + return 0; +} + +static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || + sqe->splice_fd_in)) + return -EINVAL; + + req->sync.flags = READ_ONCE(sqe->fsync_flags); + if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) + return -EINVAL; + + req->sync.off = READ_ONCE(sqe->off); + req->sync.len = READ_ONCE(sqe->len); + return 0; +} + +static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) +{ + loff_t end = req->sync.off + req->sync.len; + int ret; + + /* fsync always requires a blocking context */ + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = vfs_fsync_range(req->file, req->sync.off, + end > 0 ? end : LLONG_MAX, + req->sync.flags & IORING_FSYNC_DATASYNC); + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_fallocate_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || + sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + req->sync.off = READ_ONCE(sqe->off); + req->sync.len = READ_ONCE(sqe->addr); + req->sync.mode = READ_ONCE(sqe->len); + return 0; +} + +static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) +{ + int ret; + + /* fallocate always requiring blocking context */ + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, + req->sync.len); + if (ret < 0) + req_set_fail(req); + else + fsnotify_modify(req->file); + io_req_complete(req, ret); + return 0; +} + +static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + const char __user *fname; + int ret; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->ioprio || sqe->buf_index)) + return -EINVAL; + if (unlikely(req->flags & REQ_F_FIXED_FILE)) + return -EBADF; + + /* open.how should be already initialised */ + if (!(req->open.how.flags & O_PATH) && force_o_largefile()) + req->open.how.flags |= O_LARGEFILE; + + req->open.dfd = READ_ONCE(sqe->fd); + fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); + req->open.filename = getname(fname); + if (IS_ERR(req->open.filename)) { + ret = PTR_ERR(req->open.filename); + req->open.filename = NULL; + return ret; + } + + req->open.file_slot = READ_ONCE(sqe->file_index); + if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) + return -EINVAL; + + req->open.nofile = rlimit(RLIMIT_NOFILE); + req->flags |= REQ_F_NEED_CLEANUP; + return 0; +} + +static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + u64 mode = READ_ONCE(sqe->len); + u64 flags = READ_ONCE(sqe->open_flags); + + req->open.how = build_open_how(flags, mode); + return __io_openat_prep(req, sqe); +} + +static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct open_how __user *how; + size_t len; + int ret; + + how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + len = READ_ONCE(sqe->len); + if (len < OPEN_HOW_SIZE_VER0) + return -EINVAL; + + ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, + len); + if (ret) + return ret; + + return __io_openat_prep(req, sqe); +} + +static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) +{ + struct open_flags op; + struct file *file; + bool resolve_nonblock, nonblock_set; + bool fixed = !!req->open.file_slot; + int ret; + + ret = build_open_flags(&req->open.how, &op); + if (ret) + goto err; + nonblock_set = op.open_flag & O_NONBLOCK; + resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; + if (issue_flags & IO_URING_F_NONBLOCK) { + /* + * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, + * it'll always -EAGAIN + */ + if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) + return -EAGAIN; + op.lookup_flags |= LOOKUP_CACHED; + op.open_flag |= O_NONBLOCK; + } + + if (!fixed) { + ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); + if (ret < 0) + goto err; + } + + file = do_filp_open(req->open.dfd, req->open.filename, &op); + if (IS_ERR(file)) { + /* + * We could hang on to this 'fd' on retrying, but seems like + * marginal gain for something that is now known to be a slower + * path. So just put it, and we'll get a new one when we retry. + */ + if (!fixed) + put_unused_fd(ret); + + ret = PTR_ERR(file); + /* only retry if RESOLVE_CACHED wasn't already set by application */ + if (ret == -EAGAIN && + (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) + return -EAGAIN; + goto err; + } + + if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) + file->f_flags &= ~O_NONBLOCK; + fsnotify_open(file); + + if (!fixed) + fd_install(ret, file); + else + ret = io_install_fixed_file(req, file, issue_flags, + req->open.file_slot - 1); +err: + putname(req->open.filename); + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < 0) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_openat(struct io_kiocb *req, unsigned int issue_flags) +{ + return io_openat2(req, issue_flags); +} + +static int io_remove_buffers_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_provide_buf *p = &req->pbuf; + u64 tmp; + + if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || + sqe->splice_fd_in) + return -EINVAL; + + tmp = READ_ONCE(sqe->fd); + if (!tmp || tmp > USHRT_MAX) + return -EINVAL; + + memset(p, 0, sizeof(*p)); + p->nbufs = tmp; + p->bgid = READ_ONCE(sqe->buf_group); + return 0; +} + +static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, + int bgid, unsigned nbufs) +{ + unsigned i = 0; + + /* shouldn't happen */ + if (!nbufs) + return 0; + + /* the head kbuf is the list itself */ + while (!list_empty(&buf->list)) { + struct io_buffer *nxt; + + nxt = list_first_entry(&buf->list, struct io_buffer, list); + list_del(&nxt->list); + kfree(nxt); + if (++i == nbufs) + return i; + cond_resched(); + } + i++; + kfree(buf); + xa_erase(&ctx->io_buffers, bgid); + + return i; +} + +static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_provide_buf *p = &req->pbuf; + struct io_ring_ctx *ctx = req->ctx; + struct io_buffer *head; + int ret = 0; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + io_ring_submit_lock(ctx, !force_nonblock); + + lockdep_assert_held(&ctx->uring_lock); + + ret = -ENOENT; + head = xa_load(&ctx->io_buffers, p->bgid); + if (head) + ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); + if (ret < 0) + req_set_fail(req); + + /* complete before unlock, IOPOLL may need the lock */ + __io_req_complete(req, issue_flags, ret, 0); + io_ring_submit_unlock(ctx, !force_nonblock); + return 0; +} + +static int io_provide_buffers_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + unsigned long size, tmp_check; + struct io_provide_buf *p = &req->pbuf; + u64 tmp; + + if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) + return -EINVAL; + + tmp = READ_ONCE(sqe->fd); + if (!tmp || tmp > USHRT_MAX) + return -E2BIG; + p->nbufs = tmp; + p->addr = READ_ONCE(sqe->addr); + p->len = READ_ONCE(sqe->len); + + if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, + &size)) + return -EOVERFLOW; + if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) + return -EOVERFLOW; + + size = (unsigned long)p->len * p->nbufs; + if (!access_ok(u64_to_user_ptr(p->addr), size)) + return -EFAULT; + + p->bgid = READ_ONCE(sqe->buf_group); + tmp = READ_ONCE(sqe->off); + if (tmp > USHRT_MAX) + return -E2BIG; + p->bid = tmp; + return 0; +} + +static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) +{ + struct io_buffer *buf; + u64 addr = pbuf->addr; + int i, bid = pbuf->bid; + + for (i = 0; i < pbuf->nbufs; i++) { + buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); + if (!buf) + break; + + buf->addr = addr; + buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); + buf->bid = bid; + addr += pbuf->len; + bid++; + if (!*head) { + INIT_LIST_HEAD(&buf->list); + *head = buf; + } else { + list_add_tail(&buf->list, &(*head)->list); + } + cond_resched(); + } + + return i ? i : -ENOMEM; +} + +static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_provide_buf *p = &req->pbuf; + struct io_ring_ctx *ctx = req->ctx; + struct io_buffer *head, *list; + int ret = 0; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + io_ring_submit_lock(ctx, !force_nonblock); + + lockdep_assert_held(&ctx->uring_lock); + + list = head = xa_load(&ctx->io_buffers, p->bgid); + + ret = io_add_buffers(p, &head); + if (ret >= 0 && !list) { + ret = xa_insert(&ctx->io_buffers, p->bgid, head, + GFP_KERNEL_ACCOUNT); + if (ret < 0) + __io_remove_buffers(ctx, head, p->bgid, -1U); + } + if (ret < 0) + req_set_fail(req); + /* complete before unlock, IOPOLL may need the lock */ + __io_req_complete(req, issue_flags, ret, 0); + io_ring_submit_unlock(ctx, !force_nonblock); + return 0; +} + +static int io_epoll_ctl_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ +#if defined(CONFIG_EPOLL) + if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + req->epoll.epfd = READ_ONCE(sqe->fd); + req->epoll.op = READ_ONCE(sqe->len); + req->epoll.fd = READ_ONCE(sqe->off); + + if (ep_op_has_event(req->epoll.op)) { + struct epoll_event __user *ev; + + ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); + if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) + return -EFAULT; + } + + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) +{ +#if defined(CONFIG_EPOLL) + struct io_epoll *ie = &req->epoll; + int ret; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); + if (force_nonblock && ret == -EAGAIN) + return -EAGAIN; + + if (ret < 0) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ +#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) + if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + req->madvise.addr = READ_ONCE(sqe->addr); + req->madvise.len = READ_ONCE(sqe->len); + req->madvise.advice = READ_ONCE(sqe->fadvise_advice); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) +{ +#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) + struct io_madvise *ma = &req->madvise; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) + return -EINVAL; + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + + req->fadvise.offset = READ_ONCE(sqe->off); + req->fadvise.len = READ_ONCE(sqe->len); + req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); + return 0; +} + +static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_fadvise *fa = &req->fadvise; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) { + switch (fa->advice) { + case POSIX_FADV_NORMAL: + case POSIX_FADV_RANDOM: + case POSIX_FADV_SEQUENTIAL: + break; + default: + return -EAGAIN; + } + } + + ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); + if (ret < 0) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + if (req->flags & REQ_F_FIXED_FILE) + return -EBADF; + + req->statx.dfd = READ_ONCE(sqe->fd); + req->statx.mask = READ_ONCE(sqe->len); + req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); + req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + req->statx.flags = READ_ONCE(sqe->statx_flags); + + return 0; +} + +static int io_statx(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_statx *ctx = &req->statx; + int ret; + + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, + ctx->buffer); + + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || + sqe->rw_flags || sqe->buf_index) + return -EINVAL; + if (req->flags & REQ_F_FIXED_FILE) + return -EBADF; + + req->close.fd = READ_ONCE(sqe->fd); + req->close.file_slot = READ_ONCE(sqe->file_index); + if (req->close.file_slot && req->close.fd) + return -EINVAL; + + return 0; +} + +static int io_close(struct io_kiocb *req, unsigned int issue_flags) +{ + struct files_struct *files = current->files; + struct io_close *close = &req->close; + struct fdtable *fdt; + struct file *file = NULL; + int ret = -EBADF; + + if (req->close.file_slot) { + ret = io_close_fixed(req, issue_flags); + goto err; + } + + spin_lock(&files->file_lock); + fdt = files_fdtable(files); + if (close->fd >= fdt->max_fds) { + spin_unlock(&files->file_lock); + goto err; + } + file = fdt->fd[close->fd]; + if (!file || file->f_op == &io_uring_fops) { + spin_unlock(&files->file_lock); + file = NULL; + goto err; + } + + /* if the file has a flush method, be safe and punt to async */ + if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { + spin_unlock(&files->file_lock); + return -EAGAIN; + } + + ret = __close_fd_get_file(close->fd, &file); + spin_unlock(&files->file_lock); + if (ret < 0) { + if (ret == -ENOENT) + ret = -EBADF; + goto err; + } + + /* No ->flush() or already async, safely close from here */ + ret = filp_close(file, current->files); +err: + if (ret < 0) + req_set_fail(req); + if (file) + fput(file); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || + sqe->splice_fd_in)) + return -EINVAL; + + req->sync.off = READ_ONCE(sqe->off); + req->sync.len = READ_ONCE(sqe->len); + req->sync.flags = READ_ONCE(sqe->sync_range_flags); + return 0; +} + +static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) +{ + int ret; + + /* sync_file_range always requires a blocking context */ + if (issue_flags & IO_URING_F_NONBLOCK) + return -EAGAIN; + + ret = sync_file_range(req->file, req->sync.off, req->sync.len, + req->sync.flags); + if (ret < 0) + req_set_fail(req); + io_req_complete(req, ret); + return 0; +} + +#if defined(CONFIG_NET) +static int io_setup_async_msg(struct io_kiocb *req, + struct io_async_msghdr *kmsg) +{ + struct io_async_msghdr *async_msg = req->async_data; + + if (async_msg) + return -EAGAIN; + if (io_alloc_async_data(req)) { + kfree(kmsg->free_iov); + return -ENOMEM; + } + async_msg = req->async_data; + req->flags |= REQ_F_NEED_CLEANUP; + memcpy(async_msg, kmsg, sizeof(*kmsg)); + if (async_msg->msg.msg_name) + async_msg->msg.msg_name = &async_msg->addr; + /* if were using fast_iov, set it to the new one */ + if (!async_msg->free_iov) + async_msg->msg.msg_iter.iov = async_msg->fast_iov; + + return -EAGAIN; +} + +static int io_sendmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + iomsg->msg.msg_name = &iomsg->addr; + iomsg->free_iov = iomsg->fast_iov; + return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, + req->sr_msg.msg_flags, &iomsg->free_iov); +} + +static int io_sendmsg_prep_async(struct io_kiocb *req) +{ + int ret; + + ret = io_sendmsg_copy_hdr(req, req->async_data); + if (!ret) + req->flags |= REQ_F_NEED_CLEANUP; + return ret; +} + +static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_sr_msg *sr = &req->sr_msg; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->addr2 || sqe->file_index)) + return -EINVAL; + if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio)) + return -EINVAL; + + sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); + sr->len = READ_ONCE(sqe->len); + sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; + if (sr->msg_flags & MSG_DONTWAIT) + req->flags |= REQ_F_NOWAIT; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + sr->msg_flags |= MSG_CMSG_COMPAT; +#endif + return 0; +} + +static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_async_msghdr iomsg, *kmsg; + struct socket *sock; + unsigned flags; + int min_ret = 0; + int ret; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + kmsg = req->async_data; + if (!kmsg) { + ret = io_sendmsg_copy_hdr(req, &iomsg); + if (ret) + return ret; + kmsg = &iomsg; + } + + flags = req->sr_msg.msg_flags; + if (issue_flags & IO_URING_F_NONBLOCK) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&kmsg->msg.msg_iter); + + ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); + if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) + return io_setup_async_msg(req, kmsg); + if (ret == -ERESTARTSYS) + ret = -EINTR; + + /* fast path, check for non-NULL to avoid function call */ + if (kmsg->free_iov) + kfree(kmsg->free_iov); + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < min_ret) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_send(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_sr_msg *sr = &req->sr_msg; + struct msghdr msg; + struct iovec iov; + struct socket *sock; + unsigned flags; + int min_ret = 0; + int ret; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); + if (unlikely(ret)) + return ret; + + msg.msg_name = NULL; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_namelen = 0; + + flags = req->sr_msg.msg_flags; + if (issue_flags & IO_URING_F_NONBLOCK) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&msg.msg_iter); + + msg.msg_flags = flags; + ret = sock_sendmsg(sock, &msg); + if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) + return -EAGAIN; + if (ret == -ERESTARTSYS) + ret = -EINTR; + + if (ret < min_ret) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int __io_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + struct io_sr_msg *sr = &req->sr_msg; + struct iovec __user *uiov; + size_t iov_len; + int ret; + + ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, + &iomsg->uaddr, &uiov, &iov_len); + if (ret) + return ret; + + if (req->flags & REQ_F_BUFFER_SELECT) { + if (iov_len > 1) + return -EINVAL; + if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) + return -EFAULT; + sr->len = iomsg->fast_iov[0].iov_len; + iomsg->free_iov = NULL; + } else { + iomsg->free_iov = iomsg->fast_iov; + ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, + &iomsg->free_iov, &iomsg->msg.msg_iter, + false); + if (ret > 0) + ret = 0; + } + + return ret; +} + +#ifdef CONFIG_COMPAT +static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + struct io_sr_msg *sr = &req->sr_msg; + struct compat_iovec __user *uiov; + compat_uptr_t ptr; + compat_size_t len; + int ret; + + ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, + &ptr, &len); + if (ret) + return ret; + + uiov = compat_ptr(ptr); + if (req->flags & REQ_F_BUFFER_SELECT) { + compat_ssize_t clen; + + if (len > 1) + return -EINVAL; + if (!access_ok(uiov, sizeof(*uiov))) + return -EFAULT; + if (__get_user(clen, &uiov->iov_len)) + return -EFAULT; + if (clen < 0) + return -EINVAL; + sr->len = clen; + iomsg->free_iov = NULL; + } else { + iomsg->free_iov = iomsg->fast_iov; + ret = __import_iovec(READ, (struct iovec __user *)uiov, len, + UIO_FASTIOV, &iomsg->free_iov, + &iomsg->msg.msg_iter, true); + if (ret < 0) + return ret; + } + + return 0; +} +#endif + +static int io_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + iomsg->msg.msg_name = &iomsg->addr; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + return __io_compat_recvmsg_copy_hdr(req, iomsg); +#endif + + return __io_recvmsg_copy_hdr(req, iomsg); +} + +static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, + bool needs_lock) +{ + struct io_sr_msg *sr = &req->sr_msg; + struct io_buffer *kbuf; + + kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); + if (IS_ERR(kbuf)) + return kbuf; + + sr->kbuf = kbuf; + req->flags |= REQ_F_BUFFER_SELECTED; + return kbuf; +} + +static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) +{ + return io_put_kbuf(req, req->sr_msg.kbuf); +} + +static int io_recvmsg_prep_async(struct io_kiocb *req) +{ + int ret; + + ret = io_recvmsg_copy_hdr(req, req->async_data); + if (!ret) + req->flags |= REQ_F_NEED_CLEANUP; + return ret; +} + +static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_sr_msg *sr = &req->sr_msg; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(sqe->addr2 || sqe->file_index)) + return -EINVAL; + if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio)) + return -EINVAL; + + sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); + sr->len = READ_ONCE(sqe->len); + sr->bgid = READ_ONCE(sqe->buf_group); + sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; + if (sr->msg_flags & MSG_DONTWAIT) + req->flags |= REQ_F_NOWAIT; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + sr->msg_flags |= MSG_CMSG_COMPAT; +#endif + return 0; +} + +static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_async_msghdr iomsg, *kmsg; + struct socket *sock; + struct io_buffer *kbuf; + unsigned flags; + int min_ret = 0; + int ret, cflags = 0; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + kmsg = req->async_data; + if (!kmsg) { + ret = io_recvmsg_copy_hdr(req, &iomsg); + if (ret) + return ret; + kmsg = &iomsg; + } + + if (req->flags & REQ_F_BUFFER_SELECT) { + kbuf = io_recv_buffer_select(req, !force_nonblock); + if (IS_ERR(kbuf)) + return PTR_ERR(kbuf); + kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); + kmsg->fast_iov[0].iov_len = req->sr_msg.len; + iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, + 1, req->sr_msg.len); + } + + flags = req->sr_msg.msg_flags; + if (force_nonblock) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&kmsg->msg.msg_iter); + + ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, + kmsg->uaddr, flags); + if (force_nonblock && ret == -EAGAIN) + return io_setup_async_msg(req, kmsg); + if (ret == -ERESTARTSYS) + ret = -EINTR; + + if (req->flags & REQ_F_BUFFER_SELECTED) + cflags = io_put_recv_kbuf(req); + /* fast path, check for non-NULL to avoid function call */ + if (kmsg->free_iov) + kfree(kmsg->free_iov); + req->flags &= ~REQ_F_NEED_CLEANUP; + if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, cflags); + return 0; +} + +static int io_recv(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_buffer *kbuf; + struct io_sr_msg *sr = &req->sr_msg; + struct msghdr msg; + void __user *buf = sr->buf; + struct socket *sock; + struct iovec iov; + unsigned flags; + int min_ret = 0; + int ret, cflags = 0; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + if (req->flags & REQ_F_BUFFER_SELECT) { + kbuf = io_recv_buffer_select(req, !force_nonblock); + if (IS_ERR(kbuf)) + return PTR_ERR(kbuf); + buf = u64_to_user_ptr(kbuf->addr); + } + + ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); + if (unlikely(ret)) + goto out_free; + + msg.msg_name = NULL; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_namelen = 0; + msg.msg_iocb = NULL; + msg.msg_flags = 0; + + flags = req->sr_msg.msg_flags; + if (force_nonblock) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&msg.msg_iter); + + ret = sock_recvmsg(sock, &msg, flags); + if (force_nonblock && ret == -EAGAIN) + return -EAGAIN; + if (ret == -ERESTARTSYS) + ret = -EINTR; +out_free: + if (req->flags & REQ_F_BUFFER_SELECTED) + cflags = io_put_recv_kbuf(req); + if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, cflags); + return 0; +} + +static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_accept *accept = &req->accept; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->len || sqe->buf_index) + return -EINVAL; + + accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); + accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + accept->flags = READ_ONCE(sqe->accept_flags); + accept->nofile = rlimit(RLIMIT_NOFILE); + + accept->file_slot = READ_ONCE(sqe->file_index); + if (accept->file_slot && (accept->flags & SOCK_CLOEXEC)) + return -EINVAL; + if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) + return -EINVAL; + if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) + accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; + return 0; +} + +static int io_accept(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_accept *accept = &req->accept; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; + bool fixed = !!accept->file_slot; + struct file *file; + int ret, fd; + + if (req->file->f_flags & O_NONBLOCK) + req->flags |= REQ_F_NOWAIT; + + if (!fixed) { + fd = __get_unused_fd_flags(accept->flags, accept->nofile); + if (unlikely(fd < 0)) + return fd; + } + file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, + accept->flags); + if (IS_ERR(file)) { + if (!fixed) + put_unused_fd(fd); + ret = PTR_ERR(file); + if (ret == -EAGAIN && force_nonblock) + return -EAGAIN; + if (ret == -ERESTARTSYS) + ret = -EINTR; + req_set_fail(req); + } else if (!fixed) { + fd_install(fd, file); + ret = fd; + } else { + ret = io_install_fixed_file(req, file, issue_flags, + accept->file_slot - 1); + } + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_connect_prep_async(struct io_kiocb *req) +{ + struct io_async_connect *io = req->async_data; + struct io_connect *conn = &req->connect; + + return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); +} + +static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_connect *conn = &req->connect; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || + sqe->splice_fd_in) + return -EINVAL; + + conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); + conn->addr_len = READ_ONCE(sqe->addr2); + return 0; +} + +static int io_connect(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_async_connect __io, *io; + unsigned file_flags; + int ret; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + + if (req->async_data) { + io = req->async_data; + } else { + ret = move_addr_to_kernel(req->connect.addr, + req->connect.addr_len, + &__io.address); + if (ret) + goto out; + io = &__io; + } + + file_flags = force_nonblock ? O_NONBLOCK : 0; + + ret = __sys_connect_file(req->file, &io->address, + req->connect.addr_len, file_flags); + if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { + if (req->async_data) + return -EAGAIN; + if (io_alloc_async_data(req)) { + ret = -ENOMEM; + goto out; + } + memcpy(req->async_data, &__io, sizeof(__io)); + return -EAGAIN; + } + if (ret == -ERESTARTSYS) + ret = -EINTR; +out: + if (ret < 0) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} +#else /* !CONFIG_NET */ +#define IO_NETOP_FN(op) \ +static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ +{ \ + return -EOPNOTSUPP; \ +} + +#define IO_NETOP_PREP(op) \ +IO_NETOP_FN(op) \ +static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ +{ \ + return -EOPNOTSUPP; \ +} \ + +#define IO_NETOP_PREP_ASYNC(op) \ +IO_NETOP_PREP(op) \ +static int io_##op##_prep_async(struct io_kiocb *req) \ +{ \ + return -EOPNOTSUPP; \ +} + +IO_NETOP_PREP_ASYNC(sendmsg); +IO_NETOP_PREP_ASYNC(recvmsg); +IO_NETOP_PREP_ASYNC(connect); +IO_NETOP_PREP(accept); +IO_NETOP_FN(send); +IO_NETOP_FN(recv); +#endif /* CONFIG_NET */ + +struct io_poll_table { + struct poll_table_struct pt; + struct io_kiocb *req; + int nr_entries; + int error; +}; + +#define IO_POLL_CANCEL_FLAG BIT(31) +#define IO_POLL_RETRY_FLAG BIT(30) +#define IO_POLL_REF_MASK GENMASK(29, 0) + +/* + * We usually have 1-2 refs taken, 128 is more than enough and we want to + * maximise the margin between this amount and the moment when it overflows. + */ +#define IO_POLL_REF_BIAS 128 + +static bool io_poll_get_ownership_slowpath(struct io_kiocb *req) +{ + int v; + + /* + * poll_refs are already elevated and we don't have much hope for + * grabbing the ownership. Instead of incrementing set a retry flag + * to notify the loop that there might have been some change. + */ + v = atomic_fetch_or(IO_POLL_RETRY_FLAG, &req->poll_refs); + if (v & IO_POLL_REF_MASK) + return false; + return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); +} + +/* + * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can + * bump it and acquire ownership. It's disallowed to modify requests while not + * owning it, that prevents from races for enqueueing task_work's and b/w + * arming poll and wakeups. + */ +static inline bool io_poll_get_ownership(struct io_kiocb *req) +{ + if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) + return io_poll_get_ownership_slowpath(req); + return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); +} + +static void io_poll_mark_cancelled(struct io_kiocb *req) +{ + atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); +} + +static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) +{ + /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ + if (req->opcode == IORING_OP_POLL_ADD) + return req->async_data; + return req->apoll->double_poll; +} + +static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) +{ + if (req->opcode == IORING_OP_POLL_ADD) + return &req->poll; + return &req->apoll->poll; +} + +static void io_poll_req_insert(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + struct hlist_head *list; + + list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; + hlist_add_head(&req->hash_node, list); +} + +static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, + wait_queue_func_t wake_func) +{ + poll->head = NULL; +#define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) + /* mask in events that we always want/need */ + poll->events = events | IO_POLL_UNMASK; + INIT_LIST_HEAD(&poll->wait.entry); + init_waitqueue_func_entry(&poll->wait, wake_func); +} + +static inline void io_poll_remove_entry(struct io_poll_iocb *poll) +{ + struct wait_queue_head *head = smp_load_acquire(&poll->head); + + if (head) { + spin_lock_irq(&head->lock); + list_del_init(&poll->wait.entry); + poll->head = NULL; + spin_unlock_irq(&head->lock); + } +} + +static void io_poll_remove_entries(struct io_kiocb *req) +{ + struct io_poll_iocb *poll = io_poll_get_single(req); + struct io_poll_iocb *poll_double = io_poll_get_double(req); + + /* + * While we hold the waitqueue lock and the waitqueue is nonempty, + * wake_up_pollfree() will wait for us. However, taking the waitqueue + * lock in the first place can race with the waitqueue being freed. + * + * We solve this as eventpoll does: by taking advantage of the fact that + * all users of wake_up_pollfree() will RCU-delay the actual free. If + * we enter rcu_read_lock() and see that the pointer to the queue is + * non-NULL, we can then lock it without the memory being freed out from + * under us. + * + * Keep holding rcu_read_lock() as long as we hold the queue lock, in + * case the caller deletes the entry from the queue, leaving it empty. + * In that case, only RCU prevents the queue memory from being freed. + */ + rcu_read_lock(); + io_poll_remove_entry(poll); + if (poll_double) + io_poll_remove_entry(poll_double); + rcu_read_unlock(); +} + +/* + * All poll tw should go through this. Checks for poll events, manages + * references, does rewait, etc. + * + * Returns a negative error on failure. >0 when no action require, which is + * either spurious wakeup or multishot CQE is served. 0 when it's done with + * the request, then the mask is stored in req->result. + */ +static int io_poll_check_events(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_poll_iocb *poll = io_poll_get_single(req); + int v; + + /* req->task == current here, checking PF_EXITING is safe */ + if (unlikely(req->task->flags & PF_EXITING)) + io_poll_mark_cancelled(req); + + do { + v = atomic_read(&req->poll_refs); + + /* tw handler should be the owner, and so have some references */ + if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) + return 0; + if (v & IO_POLL_CANCEL_FLAG) + return -ECANCELED; + /* + * cqe.res contains only events of the first wake up + * and all others are be lost. Redo vfs_poll() to get + * up to date state. + */ + if ((v & IO_POLL_REF_MASK) != 1) + req->result = 0; + if (v & IO_POLL_RETRY_FLAG) { + req->result = 0; + /* + * We won't find new events that came in between + * vfs_poll and the ref put unless we clear the + * flag in advance. + */ + atomic_andnot(IO_POLL_RETRY_FLAG, &req->poll_refs); + v &= ~IO_POLL_RETRY_FLAG; + } + + if (!req->result) { + struct poll_table_struct pt = { ._key = poll->events }; + + req->result = vfs_poll(req->file, &pt) & poll->events; + } + + /* multishot, just fill an CQE and proceed */ + if (req->result && !(poll->events & EPOLLONESHOT)) { + __poll_t mask = mangle_poll(req->result & poll->events); + bool filled; + + spin_lock(&ctx->completion_lock); + filled = io_fill_cqe_aux(ctx, req->user_data, mask, + IORING_CQE_F_MORE); + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + if (unlikely(!filled)) + return -ECANCELED; + io_cqring_ev_posted(ctx); + } else if (req->result) { + return 0; + } + + /* force the next iteration to vfs_poll() */ + req->result = 0; + + /* + * Release all references, retry if someone tried to restart + * task_work while we were executing it. + */ + } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs) & + IO_POLL_REF_MASK); + + return 1; +} + +static void io_poll_task_func(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + int ret; + + ret = io_poll_check_events(req); + if (ret > 0) + return; + + if (!ret) { + req->result = mangle_poll(req->result & req->poll.events); + } else { + req->result = ret; + req_set_fail(req); + } + + io_poll_remove_entries(req); + spin_lock(&ctx->completion_lock); + hash_del(&req->hash_node); + spin_unlock(&ctx->completion_lock); + io_req_complete_post(req, req->result, 0); +} + +static void io_apoll_task_func(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + int ret; + + ret = io_poll_check_events(req); + if (ret > 0) + return; + + io_poll_remove_entries(req); + spin_lock(&ctx->completion_lock); + hash_del(&req->hash_node); + spin_unlock(&ctx->completion_lock); + + if (!ret) + io_req_task_submit(req, locked); + else + io_req_complete_failed(req, ret); +} + +static void __io_poll_execute(struct io_kiocb *req, int mask) +{ + req->result = mask; + if (req->opcode == IORING_OP_POLL_ADD) + req->io_task_work.func = io_poll_task_func; + else + req->io_task_work.func = io_apoll_task_func; + + trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); + io_req_task_work_add(req); +} + +static inline void io_poll_execute(struct io_kiocb *req, int res) +{ + if (io_poll_get_ownership(req)) + __io_poll_execute(req, res); +} + +static void io_poll_cancel_req(struct io_kiocb *req) +{ + io_poll_mark_cancelled(req); + /* kick tw, which should complete the request */ + io_poll_execute(req, 0); +} + +static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, + void *key) +{ + struct io_kiocb *req = wait->private; + struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, + wait); + __poll_t mask = key_to_poll(key); + + if (unlikely(mask & POLLFREE)) { + io_poll_mark_cancelled(req); + /* we have to kick tw in case it's not already */ + io_poll_execute(req, 0); + + /* + * If the waitqueue is being freed early but someone is already + * holds ownership over it, we have to tear down the request as + * best we can. That means immediately removing the request from + * its waitqueue and preventing all further accesses to the + * waitqueue via the request. + */ + list_del_init(&poll->wait.entry); + + /* + * Careful: this *must* be the last step, since as soon + * as req->head is NULL'ed out, the request can be + * completed and freed, since aio_poll_complete_work() + * will no longer need to take the waitqueue lock. + */ + smp_store_release(&poll->head, NULL); + return 1; + } + + /* for instances that support it check for an event match first */ + if (mask && !(mask & poll->events)) + return 0; + + if (io_poll_get_ownership(req)) + __io_poll_execute(req, mask); + return 1; +} + +static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, + struct wait_queue_head *head, + struct io_poll_iocb **poll_ptr) +{ + struct io_kiocb *req = pt->req; + + /* + * The file being polled uses multiple waitqueues for poll handling + * (e.g. one for read, one for write). Setup a separate io_poll_iocb + * if this happens. + */ + if (unlikely(pt->nr_entries)) { + struct io_poll_iocb *first = poll; + + /* double add on the same waitqueue head, ignore */ + if (first->head == head) + return; + /* already have a 2nd entry, fail a third attempt */ + if (*poll_ptr) { + if ((*poll_ptr)->head == head) + return; + pt->error = -EINVAL; + return; + } + + poll = kmalloc(sizeof(*poll), GFP_ATOMIC); + if (!poll) { + pt->error = -ENOMEM; + return; + } + io_init_poll_iocb(poll, first->events, first->wait.func); + *poll_ptr = poll; + } + + pt->nr_entries++; + poll->head = head; + poll->wait.private = req; + + if (poll->events & EPOLLEXCLUSIVE) + add_wait_queue_exclusive(head, &poll->wait); + else + add_wait_queue(head, &poll->wait); +} + +static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, + struct poll_table_struct *p) +{ + struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); + + __io_queue_proc(&pt->req->poll, pt, head, + (struct io_poll_iocb **) &pt->req->async_data); +} + +static int __io_arm_poll_handler(struct io_kiocb *req, + struct io_poll_iocb *poll, + struct io_poll_table *ipt, __poll_t mask) +{ + struct io_ring_ctx *ctx = req->ctx; + + INIT_HLIST_NODE(&req->hash_node); + io_init_poll_iocb(poll, mask, io_poll_wake); + poll->file = req->file; + poll->wait.private = req; + + ipt->pt._key = mask; + ipt->req = req; + ipt->error = 0; + ipt->nr_entries = 0; + + /* + * Take the ownership to delay any tw execution up until we're done + * with poll arming. see io_poll_get_ownership(). + */ + atomic_set(&req->poll_refs, 1); + mask = vfs_poll(req->file, &ipt->pt) & poll->events; + + if (mask && (poll->events & EPOLLONESHOT)) { + io_poll_remove_entries(req); + /* no one else has access to the req, forget about the ref */ + return mask; + } + if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { + io_poll_remove_entries(req); + if (!ipt->error) + ipt->error = -EINVAL; + return 0; + } + + spin_lock(&ctx->completion_lock); + io_poll_req_insert(req); + spin_unlock(&ctx->completion_lock); + + if (mask) { + /* can't multishot if failed, just queue the event we've got */ + if (unlikely(ipt->error || !ipt->nr_entries)) { + poll->events |= EPOLLONESHOT; + ipt->error = 0; + } + __io_poll_execute(req, mask); + return 0; + } + + /* + * Try to release ownership. If we see a change of state, e.g. + * poll was waken up, queue up a tw, it'll deal with it. + */ + if (atomic_cmpxchg(&req->poll_refs, 1, 0) != 1) + __io_poll_execute(req, 0); + return 0; +} + +static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, + struct poll_table_struct *p) +{ + struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); + struct async_poll *apoll = pt->req->apoll; + + __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); +} + +enum { + IO_APOLL_OK, + IO_APOLL_ABORTED, + IO_APOLL_READY +}; + +static int io_arm_poll_handler(struct io_kiocb *req) +{ + const struct io_op_def *def = &io_op_defs[req->opcode]; + struct io_ring_ctx *ctx = req->ctx; + struct async_poll *apoll; + struct io_poll_table ipt; + __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; + int ret; + + if (!req->file || !file_can_poll(req->file)) + return IO_APOLL_ABORTED; + if (req->flags & REQ_F_POLLED) + return IO_APOLL_ABORTED; + if (!def->pollin && !def->pollout) + return IO_APOLL_ABORTED; + + if (def->pollin) { + mask |= POLLIN | POLLRDNORM; + + /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ + if ((req->opcode == IORING_OP_RECVMSG) && + (req->sr_msg.msg_flags & MSG_ERRQUEUE)) + mask &= ~POLLIN; + } else { + mask |= POLLOUT | POLLWRNORM; + } + + apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); + if (unlikely(!apoll)) + return IO_APOLL_ABORTED; + apoll->double_poll = NULL; + req->apoll = apoll; + req->flags |= REQ_F_POLLED; + ipt.pt._qproc = io_async_queue_proc; + + ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); + if (ret || ipt.error) + return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; + + trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, + mask, apoll->poll.events); + return IO_APOLL_OK; +} + +/* + * Returns true if we found and killed one or more poll requests + */ +static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, + bool cancel_all) +{ + struct hlist_node *tmp; + struct io_kiocb *req; + bool found = false; + int i; + + spin_lock(&ctx->completion_lock); + for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { + struct hlist_head *list; + + list = &ctx->cancel_hash[i]; + hlist_for_each_entry_safe(req, tmp, list, hash_node) { + if (io_match_task_safe(req, tsk, cancel_all)) { + hlist_del_init(&req->hash_node); + io_poll_cancel_req(req); + found = true; + } + } + } + spin_unlock(&ctx->completion_lock); + return found; +} + +static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, + bool poll_only) + __must_hold(&ctx->completion_lock) +{ + struct hlist_head *list; + struct io_kiocb *req; + + list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; + hlist_for_each_entry(req, list, hash_node) { + if (sqe_addr != req->user_data) + continue; + if (poll_only && req->opcode != IORING_OP_POLL_ADD) + continue; + return req; + } + return NULL; +} + +static bool io_poll_disarm(struct io_kiocb *req) + __must_hold(&ctx->completion_lock) +{ + if (!io_poll_get_ownership(req)) + return false; + io_poll_remove_entries(req); + hash_del(&req->hash_node); + return true; +} + +static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, + bool poll_only) + __must_hold(&ctx->completion_lock) +{ + struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only); + + if (!req) + return -ENOENT; + io_poll_cancel_req(req); + return 0; +} + +static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, + unsigned int flags) +{ + u32 events; + + events = READ_ONCE(sqe->poll32_events); +#ifdef __BIG_ENDIAN + events = swahw32(events); +#endif + if (!(flags & IORING_POLL_ADD_MULTI)) + events |= EPOLLONESHOT; + return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); +} + +static int io_poll_update_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_poll_update *upd = &req->poll_update; + u32 flags; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) + return -EINVAL; + flags = READ_ONCE(sqe->len); + if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | + IORING_POLL_ADD_MULTI)) + return -EINVAL; + /* meaningless without update */ + if (flags == IORING_POLL_ADD_MULTI) + return -EINVAL; + + upd->old_user_data = READ_ONCE(sqe->addr); + upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; + upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; + + upd->new_user_data = READ_ONCE(sqe->off); + if (!upd->update_user_data && upd->new_user_data) + return -EINVAL; + if (upd->update_events) + upd->events = io_poll_parse_events(sqe, flags); + else if (sqe->poll32_events) + return -EINVAL; + + return 0; +} + +static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_poll_iocb *poll = &req->poll; + u32 flags; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) + return -EINVAL; + flags = READ_ONCE(sqe->len); + if (flags & ~IORING_POLL_ADD_MULTI) + return -EINVAL; + + io_req_set_refcount(req); + poll->events = io_poll_parse_events(sqe, flags); + return 0; +} + +static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_poll_iocb *poll = &req->poll; + struct io_poll_table ipt; + int ret; + + ipt.pt._qproc = io_poll_queue_proc; + + ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); + if (!ret && ipt.error) + req_set_fail(req); + ret = ret ?: ipt.error; + if (ret) + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_kiocb *preq; + int ret2, ret = 0; + + spin_lock(&ctx->completion_lock); + preq = io_poll_find(ctx, req->poll_update.old_user_data, true); + if (!preq || !io_poll_disarm(preq)) { + spin_unlock(&ctx->completion_lock); + ret = preq ? -EALREADY : -ENOENT; + goto out; + } + spin_unlock(&ctx->completion_lock); + + if (req->poll_update.update_events || req->poll_update.update_user_data) { + /* only mask one event flags, keep behavior flags */ + if (req->poll_update.update_events) { + preq->poll.events &= ~0xffff; + preq->poll.events |= req->poll_update.events & 0xffff; + preq->poll.events |= IO_POLL_UNMASK; + } + if (req->poll_update.update_user_data) + preq->user_data = req->poll_update.new_user_data; + + ret2 = io_poll_add(preq, issue_flags); + /* successfully updated, don't complete poll request */ + if (!ret2) + goto out; + } + req_set_fail(preq); + io_req_complete(preq, -ECANCELED); +out: + if (ret < 0) + req_set_fail(req); + /* complete update request, we're done with it */ + io_req_complete(req, ret); + return 0; +} + +static void io_req_task_timeout(struct io_kiocb *req, bool *locked) +{ + req_set_fail(req); + io_req_complete_post(req, -ETIME, 0); +} + +static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) +{ + struct io_timeout_data *data = container_of(timer, + struct io_timeout_data, timer); + struct io_kiocb *req = data->req; + struct io_ring_ctx *ctx = req->ctx; + unsigned long flags; + + spin_lock_irqsave(&ctx->timeout_lock, flags); + list_del_init(&req->timeout.list); + atomic_set(&req->ctx->cq_timeouts, + atomic_read(&req->ctx->cq_timeouts) + 1); + spin_unlock_irqrestore(&ctx->timeout_lock, flags); + + req->io_task_work.func = io_req_task_timeout; + io_req_task_work_add(req); + return HRTIMER_NORESTART; +} + +static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, + __u64 user_data) + __must_hold(&ctx->timeout_lock) +{ + struct io_timeout_data *io; + struct io_kiocb *req; + bool found = false; + + list_for_each_entry(req, &ctx->timeout_list, timeout.list) { + found = user_data == req->user_data; + if (found) + break; + } + if (!found) + return ERR_PTR(-ENOENT); + + io = req->async_data; + if (hrtimer_try_to_cancel(&io->timer) == -1) + return ERR_PTR(-EALREADY); + list_del_init(&req->timeout.list); + return req; +} + +static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) + __must_hold(&ctx->completion_lock) + __must_hold(&ctx->timeout_lock) +{ + struct io_kiocb *req = io_timeout_extract(ctx, user_data); + + if (IS_ERR(req)) + return PTR_ERR(req); + + req_set_fail(req); + io_fill_cqe_req(req, -ECANCELED, 0); + io_put_req_deferred(req); + return 0; +} + +static clockid_t io_timeout_get_clock(struct io_timeout_data *data) +{ + switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { + case IORING_TIMEOUT_BOOTTIME: + return CLOCK_BOOTTIME; + case IORING_TIMEOUT_REALTIME: + return CLOCK_REALTIME; + default: + /* can't happen, vetted at prep time */ + WARN_ON_ONCE(1); + fallthrough; + case 0: + return CLOCK_MONOTONIC; + } +} + +static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, + struct timespec64 *ts, enum hrtimer_mode mode) + __must_hold(&ctx->timeout_lock) +{ + struct io_timeout_data *io; + struct io_kiocb *req; + bool found = false; + + list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { + found = user_data == req->user_data; + if (found) + break; + } + if (!found) + return -ENOENT; + + io = req->async_data; + if (hrtimer_try_to_cancel(&io->timer) == -1) + return -EALREADY; + hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); + io->timer.function = io_link_timeout_fn; + hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); + return 0; +} + +static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, + struct timespec64 *ts, enum hrtimer_mode mode) + __must_hold(&ctx->timeout_lock) +{ + struct io_kiocb *req = io_timeout_extract(ctx, user_data); + struct io_timeout_data *data; + + if (IS_ERR(req)) + return PTR_ERR(req); + + req->timeout.off = 0; /* noseq */ + data = req->async_data; + list_add_tail(&req->timeout.list, &ctx->timeout_list); + hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); + data->timer.function = io_timeout_fn; + hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); + return 0; +} + +static int io_timeout_remove_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + struct io_timeout_rem *tr = &req->timeout_rem; + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) + return -EINVAL; + + tr->ltimeout = false; + tr->addr = READ_ONCE(sqe->addr); + tr->flags = READ_ONCE(sqe->timeout_flags); + if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { + if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) + return -EINVAL; + if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) + tr->ltimeout = true; + if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) + return -EINVAL; + if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) + return -EFAULT; + } else if (tr->flags) { + /* timeout removal doesn't support flags */ + return -EINVAL; + } + + return 0; +} + +static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) +{ + return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS + : HRTIMER_MODE_REL; +} + +/* + * Remove or update an existing timeout command + */ +static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_timeout_rem *tr = &req->timeout_rem; + struct io_ring_ctx *ctx = req->ctx; + int ret; + + if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { + spin_lock(&ctx->completion_lock); + spin_lock_irq(&ctx->timeout_lock); + ret = io_timeout_cancel(ctx, tr->addr); + spin_unlock_irq(&ctx->timeout_lock); + spin_unlock(&ctx->completion_lock); + } else { + enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); + + spin_lock_irq(&ctx->timeout_lock); + if (tr->ltimeout) + ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); + else + ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); + spin_unlock_irq(&ctx->timeout_lock); + } + + if (ret < 0) + req_set_fail(req); + io_req_complete_post(req, ret, 0); + return 0; +} + +static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, + bool is_timeout_link) +{ + struct io_timeout_data *data; + unsigned flags; + u32 off = READ_ONCE(sqe->off); + + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || + sqe->splice_fd_in) + return -EINVAL; + if (off && is_timeout_link) + return -EINVAL; + flags = READ_ONCE(sqe->timeout_flags); + if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) + return -EINVAL; + /* more than one clock specified is invalid, obviously */ + if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) + return -EINVAL; + + INIT_LIST_HEAD(&req->timeout.list); + req->timeout.off = off; + if (unlikely(off && !req->ctx->off_timeout_used)) + req->ctx->off_timeout_used = true; + + if (!req->async_data && io_alloc_async_data(req)) + return -ENOMEM; + + data = req->async_data; + data->req = req; + data->flags = flags; + + if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) + return -EFAULT; + + INIT_LIST_HEAD(&req->timeout.list); + data->mode = io_translate_timeout_mode(flags); + hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); + + if (is_timeout_link) { + struct io_submit_link *link = &req->ctx->submit_state.link; + + if (!link->head) + return -EINVAL; + if (link->last->opcode == IORING_OP_LINK_TIMEOUT) + return -EINVAL; + req->timeout.head = link->last; + link->last->flags |= REQ_F_ARM_LTIMEOUT; + } + return 0; +} + +static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_timeout_data *data = req->async_data; + struct list_head *entry; + u32 tail, off = req->timeout.off; + + spin_lock_irq(&ctx->timeout_lock); + + /* + * sqe->off holds how many events that need to occur for this + * timeout event to be satisfied. If it isn't set, then this is + * a pure timeout request, sequence isn't used. + */ + if (io_is_timeout_noseq(req)) { + entry = ctx->timeout_list.prev; + goto add; + } + + tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); + req->timeout.target_seq = tail + off; + + /* Update the last seq here in case io_flush_timeouts() hasn't. + * This is safe because ->completion_lock is held, and submissions + * and completions are never mixed in the same ->completion_lock section. + */ + ctx->cq_last_tm_flush = tail; + + /* + * Insertion sort, ensuring the first entry in the list is always + * the one we need first. + */ + list_for_each_prev(entry, &ctx->timeout_list) { + struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, + timeout.list); + + if (io_is_timeout_noseq(nxt)) + continue; + /* nxt.seq is behind @tail, otherwise would've been completed */ + if (off >= nxt->timeout.target_seq - tail) + break; + } +add: + list_add(&req->timeout.list, entry); + data->timer.function = io_timeout_fn; + hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); + spin_unlock_irq(&ctx->timeout_lock); + return 0; +} + +struct io_cancel_data { + struct io_ring_ctx *ctx; + u64 user_data; +}; + +static bool io_cancel_cb(struct io_wq_work *work, void *data) +{ + struct io_kiocb *req = container_of(work, struct io_kiocb, work); + struct io_cancel_data *cd = data; + + return req->ctx == cd->ctx && req->user_data == cd->user_data; +} + +static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, + struct io_ring_ctx *ctx) +{ + struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; + enum io_wq_cancel cancel_ret; + int ret = 0; + + if (!tctx || !tctx->io_wq) + return -ENOENT; + + cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); + switch (cancel_ret) { + case IO_WQ_CANCEL_OK: + ret = 0; + break; + case IO_WQ_CANCEL_RUNNING: + ret = -EALREADY; + break; + case IO_WQ_CANCEL_NOTFOUND: + ret = -ENOENT; + break; + } + + return ret; +} + +static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) +{ + struct io_ring_ctx *ctx = req->ctx; + int ret; + + WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); + + ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); + if (ret != -ENOENT) + return ret; + + spin_lock(&ctx->completion_lock); + spin_lock_irq(&ctx->timeout_lock); + ret = io_timeout_cancel(ctx, sqe_addr); + spin_unlock_irq(&ctx->timeout_lock); + if (ret != -ENOENT) + goto out; + ret = io_poll_cancel(ctx, sqe_addr, false); +out: + spin_unlock(&ctx->completion_lock); + return ret; +} + +static int io_async_cancel_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) + return -EINVAL; + if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) + return -EINVAL; + if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || + sqe->splice_fd_in) + return -EINVAL; + + req->cancel.addr = READ_ONCE(sqe->addr); + return 0; +} + +static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + u64 sqe_addr = req->cancel.addr; + struct io_tctx_node *node; + int ret; + + ret = io_try_cancel_userdata(req, sqe_addr); + if (ret != -ENOENT) + goto done; + + /* slow path, try all io-wq's */ + io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); + ret = -ENOENT; + list_for_each_entry(node, &ctx->tctx_list, ctx_node) { + struct io_uring_task *tctx = node->task->io_uring; + + ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); + if (ret != -ENOENT) + break; + } + io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); +done: + if (ret < 0) + req_set_fail(req); + io_req_complete_post(req, ret, 0); + return 0; +} + +static int io_rsrc_update_prep(struct io_kiocb *req, + const struct io_uring_sqe *sqe) +{ + if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) + return -EINVAL; + if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) + return -EINVAL; + + req->rsrc_update.offset = READ_ONCE(sqe->off); + req->rsrc_update.nr_args = READ_ONCE(sqe->len); + if (!req->rsrc_update.nr_args) + return -EINVAL; + req->rsrc_update.arg = READ_ONCE(sqe->addr); + return 0; +} + +static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_uring_rsrc_update2 up; + int ret; + + up.offset = req->rsrc_update.offset; + up.data = req->rsrc_update.arg; + up.nr = 0; + up.tags = 0; + up.resv = 0; + up.resv2 = 0; + + io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); + ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, + &up, req->rsrc_update.nr_args); + io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); + + if (ret < 0) + req_set_fail(req); + __io_req_complete(req, issue_flags, ret, 0); + return 0; +} + +static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + switch (req->opcode) { + case IORING_OP_NOP: + return 0; + case IORING_OP_READV: + case IORING_OP_READ_FIXED: + case IORING_OP_READ: + return io_read_prep(req, sqe); + case IORING_OP_WRITEV: + case IORING_OP_WRITE_FIXED: + case IORING_OP_WRITE: + return io_write_prep(req, sqe); + case IORING_OP_POLL_ADD: + return io_poll_add_prep(req, sqe); + case IORING_OP_POLL_REMOVE: + return io_poll_update_prep(req, sqe); + case IORING_OP_FSYNC: + return io_fsync_prep(req, sqe); + case IORING_OP_SYNC_FILE_RANGE: + return io_sfr_prep(req, sqe); + case IORING_OP_SENDMSG: + case IORING_OP_SEND: + return io_sendmsg_prep(req, sqe); + case IORING_OP_RECVMSG: + case IORING_OP_RECV: + return io_recvmsg_prep(req, sqe); + case IORING_OP_CONNECT: + return io_connect_prep(req, sqe); + case IORING_OP_TIMEOUT: + return io_timeout_prep(req, sqe, false); + case IORING_OP_TIMEOUT_REMOVE: + return io_timeout_remove_prep(req, sqe); + case IORING_OP_ASYNC_CANCEL: + return io_async_cancel_prep(req, sqe); + case IORING_OP_LINK_TIMEOUT: + return io_timeout_prep(req, sqe, true); + case IORING_OP_ACCEPT: + return io_accept_prep(req, sqe); + case IORING_OP_FALLOCATE: + return io_fallocate_prep(req, sqe); + case IORING_OP_OPENAT: + return io_openat_prep(req, sqe); + case IORING_OP_CLOSE: + return io_close_prep(req, sqe); + case IORING_OP_FILES_UPDATE: + return io_rsrc_update_prep(req, sqe); + case IORING_OP_STATX: + return io_statx_prep(req, sqe); + case IORING_OP_FADVISE: + return io_fadvise_prep(req, sqe); + case IORING_OP_MADVISE: + return io_madvise_prep(req, sqe); + case IORING_OP_OPENAT2: + return io_openat2_prep(req, sqe); + case IORING_OP_EPOLL_CTL: + return io_epoll_ctl_prep(req, sqe); + case IORING_OP_SPLICE: + return io_splice_prep(req, sqe); + case IORING_OP_PROVIDE_BUFFERS: + return io_provide_buffers_prep(req, sqe); + case IORING_OP_REMOVE_BUFFERS: + return io_remove_buffers_prep(req, sqe); + case IORING_OP_TEE: + return io_tee_prep(req, sqe); + case IORING_OP_SHUTDOWN: + return io_shutdown_prep(req, sqe); + case IORING_OP_RENAMEAT: + return io_renameat_prep(req, sqe); + case IORING_OP_UNLINKAT: + return io_unlinkat_prep(req, sqe); + case IORING_OP_MKDIRAT: + return io_mkdirat_prep(req, sqe); + case IORING_OP_SYMLINKAT: + return io_symlinkat_prep(req, sqe); + case IORING_OP_LINKAT: + return io_linkat_prep(req, sqe); + } + + printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", + req->opcode); + return -EINVAL; +} + +static int io_req_prep_async(struct io_kiocb *req) +{ + if (!io_op_defs[req->opcode].needs_async_setup) + return 0; + if (WARN_ON_ONCE(req->async_data)) + return -EFAULT; + if (io_alloc_async_data(req)) + return -EAGAIN; + + switch (req->opcode) { + case IORING_OP_READV: + return io_rw_prep_async(req, READ); + case IORING_OP_WRITEV: + return io_rw_prep_async(req, WRITE); + case IORING_OP_SENDMSG: + return io_sendmsg_prep_async(req); + case IORING_OP_RECVMSG: + return io_recvmsg_prep_async(req); + case IORING_OP_CONNECT: + return io_connect_prep_async(req); + } + printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", + req->opcode); + return -EFAULT; +} + +static u32 io_get_sequence(struct io_kiocb *req) +{ + u32 seq = req->ctx->cached_sq_head; + + /* need original cached_sq_head, but it was increased for each req */ + io_for_each_link(req, req) + seq--; + return seq; +} + +static bool io_drain_req(struct io_kiocb *req) +{ + struct io_kiocb *pos; + struct io_ring_ctx *ctx = req->ctx; + struct io_defer_entry *de; + int ret; + u32 seq; + + if (req->flags & REQ_F_FAIL) { + io_req_complete_fail_submit(req); + return true; + } + + /* + * If we need to drain a request in the middle of a link, drain the + * head request and the next request/link after the current link. + * Considering sequential execution of links, IOSQE_IO_DRAIN will be + * maintained for every request of our link. + */ + if (ctx->drain_next) { + req->flags |= REQ_F_IO_DRAIN; + ctx->drain_next = false; + } + /* not interested in head, start from the first linked */ + io_for_each_link(pos, req->link) { + if (pos->flags & REQ_F_IO_DRAIN) { + ctx->drain_next = true; + req->flags |= REQ_F_IO_DRAIN; + break; + } + } + + /* Still need defer if there is pending req in defer list. */ + spin_lock(&ctx->completion_lock); + if (likely(list_empty_careful(&ctx->defer_list) && + !(req->flags & REQ_F_IO_DRAIN))) { + spin_unlock(&ctx->completion_lock); + ctx->drain_active = false; + return false; + } + spin_unlock(&ctx->completion_lock); + + seq = io_get_sequence(req); + /* Still a chance to pass the sequence check */ + if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) + return false; + + ret = io_req_prep_async(req); + if (ret) + goto fail; + io_prep_async_link(req); + de = kmalloc(sizeof(*de), GFP_KERNEL); + if (!de) { + ret = -ENOMEM; +fail: + io_req_complete_failed(req, ret); + return true; + } + + spin_lock(&ctx->completion_lock); + if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { + spin_unlock(&ctx->completion_lock); + kfree(de); + io_queue_async_work(req, NULL); + return true; + } + + trace_io_uring_defer(ctx, req, req->user_data); + de->req = req; + de->seq = seq; + list_add_tail(&de->list, &ctx->defer_list); + spin_unlock(&ctx->completion_lock); + return true; +} + +static void io_clean_op(struct io_kiocb *req) +{ + if (req->flags & REQ_F_BUFFER_SELECTED) { + switch (req->opcode) { + case IORING_OP_READV: + case IORING_OP_READ_FIXED: + case IORING_OP_READ: + kfree((void *)(unsigned long)req->rw.addr); + break; + case IORING_OP_RECVMSG: + case IORING_OP_RECV: + kfree(req->sr_msg.kbuf); + break; + } + } + + if (req->flags & REQ_F_NEED_CLEANUP) { + switch (req->opcode) { + case IORING_OP_READV: + case IORING_OP_READ_FIXED: + case IORING_OP_READ: + case IORING_OP_WRITEV: + case IORING_OP_WRITE_FIXED: + case IORING_OP_WRITE: { + struct io_async_rw *io = req->async_data; + + kfree(io->free_iovec); + break; + } + case IORING_OP_RECVMSG: + case IORING_OP_SENDMSG: { + struct io_async_msghdr *io = req->async_data; + + kfree(io->free_iov); + break; + } + case IORING_OP_OPENAT: + case IORING_OP_OPENAT2: + if (req->open.filename) + putname(req->open.filename); + break; + case IORING_OP_RENAMEAT: + putname(req->rename.oldpath); + putname(req->rename.newpath); + break; + case IORING_OP_UNLINKAT: + putname(req->unlink.filename); + break; + case IORING_OP_MKDIRAT: + putname(req->mkdir.filename); + break; + case IORING_OP_SYMLINKAT: + putname(req->symlink.oldpath); + putname(req->symlink.newpath); + break; + case IORING_OP_LINKAT: + putname(req->hardlink.oldpath); + putname(req->hardlink.newpath); + break; + } + } + if ((req->flags & REQ_F_POLLED) && req->apoll) { + kfree(req->apoll->double_poll); + kfree(req->apoll); + req->apoll = NULL; + } + if (req->flags & REQ_F_INFLIGHT) { + struct io_uring_task *tctx = req->task->io_uring; + + atomic_dec(&tctx->inflight_tracked); + } + if (req->flags & REQ_F_CREDS) + put_cred(req->creds); + + req->flags &= ~IO_REQ_CLEAN_FLAGS; +} + +static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + const struct cred *creds = NULL; + int ret; + + if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) + creds = override_creds(req->creds); + + switch (req->opcode) { + case IORING_OP_NOP: + ret = io_nop(req, issue_flags); + break; + case IORING_OP_READV: + case IORING_OP_READ_FIXED: + case IORING_OP_READ: + ret = io_read(req, issue_flags); + break; + case IORING_OP_WRITEV: + case IORING_OP_WRITE_FIXED: + case IORING_OP_WRITE: + ret = io_write(req, issue_flags); + break; + case IORING_OP_FSYNC: + ret = io_fsync(req, issue_flags); + break; + case IORING_OP_POLL_ADD: + ret = io_poll_add(req, issue_flags); + break; + case IORING_OP_POLL_REMOVE: + ret = io_poll_update(req, issue_flags); + break; + case IORING_OP_SYNC_FILE_RANGE: + ret = io_sync_file_range(req, issue_flags); + break; + case IORING_OP_SENDMSG: + ret = io_sendmsg(req, issue_flags); + break; + case IORING_OP_SEND: + ret = io_send(req, issue_flags); + break; + case IORING_OP_RECVMSG: + ret = io_recvmsg(req, issue_flags); + break; + case IORING_OP_RECV: + ret = io_recv(req, issue_flags); + break; + case IORING_OP_TIMEOUT: + ret = io_timeout(req, issue_flags); + break; + case IORING_OP_TIMEOUT_REMOVE: + ret = io_timeout_remove(req, issue_flags); + break; + case IORING_OP_ACCEPT: + ret = io_accept(req, issue_flags); + break; + case IORING_OP_CONNECT: + ret = io_connect(req, issue_flags); + break; + case IORING_OP_ASYNC_CANCEL: + ret = io_async_cancel(req, issue_flags); + break; + case IORING_OP_FALLOCATE: + ret = io_fallocate(req, issue_flags); + break; + case IORING_OP_OPENAT: + ret = io_openat(req, issue_flags); + break; + case IORING_OP_CLOSE: + ret = io_close(req, issue_flags); + break; + case IORING_OP_FILES_UPDATE: + ret = io_files_update(req, issue_flags); + break; + case IORING_OP_STATX: + ret = io_statx(req, issue_flags); + break; + case IORING_OP_FADVISE: + ret = io_fadvise(req, issue_flags); + break; + case IORING_OP_MADVISE: + ret = io_madvise(req, issue_flags); + break; + case IORING_OP_OPENAT2: + ret = io_openat2(req, issue_flags); + break; + case IORING_OP_EPOLL_CTL: + ret = io_epoll_ctl(req, issue_flags); + break; + case IORING_OP_SPLICE: + ret = io_splice(req, issue_flags); + break; + case IORING_OP_PROVIDE_BUFFERS: + ret = io_provide_buffers(req, issue_flags); + break; + case IORING_OP_REMOVE_BUFFERS: + ret = io_remove_buffers(req, issue_flags); + break; + case IORING_OP_TEE: + ret = io_tee(req, issue_flags); + break; + case IORING_OP_SHUTDOWN: + ret = io_shutdown(req, issue_flags); + break; + case IORING_OP_RENAMEAT: + ret = io_renameat(req, issue_flags); + break; + case IORING_OP_UNLINKAT: + ret = io_unlinkat(req, issue_flags); + break; + case IORING_OP_MKDIRAT: + ret = io_mkdirat(req, issue_flags); + break; + case IORING_OP_SYMLINKAT: + ret = io_symlinkat(req, issue_flags); + break; + case IORING_OP_LINKAT: + ret = io_linkat(req, issue_flags); + break; + default: + ret = -EINVAL; + break; + } + + if (creds) + revert_creds(creds); + if (ret) + return ret; + /* If the op doesn't have a file, we're not polling for it */ + if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) + io_iopoll_req_issued(req); + + return 0; +} + +static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) +{ + struct io_kiocb *req = container_of(work, struct io_kiocb, work); + + req = io_put_req_find_next(req); + return req ? &req->work : NULL; +} + +static void io_wq_submit_work(struct io_wq_work *work) +{ + struct io_kiocb *req = container_of(work, struct io_kiocb, work); + struct io_kiocb *timeout; + int ret = 0; + + /* one will be dropped by ->io_free_work() after returning to io-wq */ + if (!(req->flags & REQ_F_REFCOUNT)) + __io_req_set_refcount(req, 2); + else + req_ref_get(req); + + timeout = io_prep_linked_timeout(req); + if (timeout) + io_queue_linked_timeout(timeout); + + /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ + if (work->flags & IO_WQ_WORK_CANCEL) + ret = -ECANCELED; + + if (!ret) { + do { + ret = io_issue_sqe(req, 0); + /* + * We can get EAGAIN for polled IO even though we're + * forcing a sync submission from here, since we can't + * wait for request slots on the block side. + */ + if (ret != -EAGAIN || !(req->ctx->flags & IORING_SETUP_IOPOLL)) + break; + cond_resched(); + } while (1); + } + + /* avoid locking problems by failing it from a clean context */ + if (ret) + io_req_task_queue_fail(req, ret); +} + +static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, + unsigned i) +{ + return &table->files[i]; +} + +static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, + int index) +{ + struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); + + return (struct file *) (slot->file_ptr & FFS_MASK); +} + +static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) +{ + unsigned long file_ptr = (unsigned long) file; + + if (__io_file_supports_nowait(file, READ)) + file_ptr |= FFS_ASYNC_READ; + if (__io_file_supports_nowait(file, WRITE)) + file_ptr |= FFS_ASYNC_WRITE; + if (S_ISREG(file_inode(file)->i_mode)) + file_ptr |= FFS_ISREG; + file_slot->file_ptr = file_ptr; +} + +static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, + struct io_kiocb *req, int fd) +{ + struct file *file; + unsigned long file_ptr; + + if (unlikely((unsigned int)fd >= ctx->nr_user_files)) + return NULL; + fd = array_index_nospec(fd, ctx->nr_user_files); + file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; + file = (struct file *) (file_ptr & FFS_MASK); + file_ptr &= ~FFS_MASK; + /* mask in overlapping REQ_F and FFS bits */ + req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); + io_req_set_rsrc_node(req); + return file; +} + +static struct file *io_file_get_normal(struct io_ring_ctx *ctx, + struct io_kiocb *req, int fd) +{ + struct file *file = fget(fd); + + trace_io_uring_file_get(ctx, fd); + + /* we don't allow fixed io_uring files */ + if (file && unlikely(file->f_op == &io_uring_fops)) + io_req_track_inflight(req); + return file; +} + +static inline struct file *io_file_get(struct io_ring_ctx *ctx, + struct io_kiocb *req, int fd, bool fixed) +{ + if (fixed) + return io_file_get_fixed(ctx, req, fd); + else + return io_file_get_normal(ctx, req, fd); +} + +static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) +{ + struct io_kiocb *prev = req->timeout.prev; + int ret = -ENOENT; + + if (prev) { + if (!(req->task->flags & PF_EXITING)) + ret = io_try_cancel_userdata(req, prev->user_data); + io_req_complete_post(req, ret ?: -ETIME, 0); + io_put_req(prev); + } else { + io_req_complete_post(req, -ETIME, 0); + } +} + +static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) +{ + struct io_timeout_data *data = container_of(timer, + struct io_timeout_data, timer); + struct io_kiocb *prev, *req = data->req; + struct io_ring_ctx *ctx = req->ctx; + unsigned long flags; + + spin_lock_irqsave(&ctx->timeout_lock, flags); + prev = req->timeout.head; + req->timeout.head = NULL; + + /* + * We don't expect the list to be empty, that will only happen if we + * race with the completion of the linked work. + */ + if (prev) { + io_remove_next_linked(prev); + if (!req_ref_inc_not_zero(prev)) + prev = NULL; + } + list_del(&req->timeout.list); + req->timeout.prev = prev; + spin_unlock_irqrestore(&ctx->timeout_lock, flags); + + req->io_task_work.func = io_req_task_link_timeout; + io_req_task_work_add(req); + return HRTIMER_NORESTART; +} + +static void io_queue_linked_timeout(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + + spin_lock_irq(&ctx->timeout_lock); + /* + * If the back reference is NULL, then our linked request finished + * before we got a chance to setup the timer + */ + if (req->timeout.head) { + struct io_timeout_data *data = req->async_data; + + data->timer.function = io_link_timeout_fn; + hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), + data->mode); + list_add_tail(&req->timeout.list, &ctx->ltimeout_list); + } + spin_unlock_irq(&ctx->timeout_lock); + /* drop submission reference */ + io_put_req(req); +} + +static void __io_queue_sqe(struct io_kiocb *req) + __must_hold(&req->ctx->uring_lock) +{ + struct io_kiocb *linked_timeout; + int ret; + +issue_sqe: + ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); + + /* + * We async punt it if the file wasn't marked NOWAIT, or if the file + * doesn't support non-blocking read/write attempts + */ + if (likely(!ret)) { + if (req->flags & REQ_F_COMPLETE_INLINE) { + struct io_ring_ctx *ctx = req->ctx; + struct io_submit_state *state = &ctx->submit_state; + + state->compl_reqs[state->compl_nr++] = req; + if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) + io_submit_flush_completions(ctx); + return; + } + + linked_timeout = io_prep_linked_timeout(req); + if (linked_timeout) + io_queue_linked_timeout(linked_timeout); + } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { + linked_timeout = io_prep_linked_timeout(req); + + switch (io_arm_poll_handler(req)) { + case IO_APOLL_READY: + if (linked_timeout) + io_queue_linked_timeout(linked_timeout); + goto issue_sqe; + case IO_APOLL_ABORTED: + /* + * Queued up for async execution, worker will release + * submit reference when the iocb is actually submitted. + */ + io_queue_async_work(req, NULL); + break; + } + + if (linked_timeout) + io_queue_linked_timeout(linked_timeout); + } else { + io_req_complete_failed(req, ret); + } +} + +static inline void io_queue_sqe(struct io_kiocb *req) + __must_hold(&req->ctx->uring_lock) +{ + if (unlikely(req->ctx->drain_active) && io_drain_req(req)) + return; + + if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { + __io_queue_sqe(req); + } else if (req->flags & REQ_F_FAIL) { + io_req_complete_fail_submit(req); + } else { + int ret = io_req_prep_async(req); + + if (unlikely(ret)) + io_req_complete_failed(req, ret); + else + io_queue_async_work(req, NULL); + } +} + +/* + * Check SQE restrictions (opcode and flags). + * + * Returns 'true' if SQE is allowed, 'false' otherwise. + */ +static inline bool io_check_restriction(struct io_ring_ctx *ctx, + struct io_kiocb *req, + unsigned int sqe_flags) +{ + if (likely(!ctx->restricted)) + return true; + + if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) + return false; + + if ((sqe_flags & ctx->restrictions.sqe_flags_required) != + ctx->restrictions.sqe_flags_required) + return false; + + if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | + ctx->restrictions.sqe_flags_required)) + return false; + + return true; +} + +static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, + const struct io_uring_sqe *sqe) + __must_hold(&ctx->uring_lock) +{ + struct io_submit_state *state; + unsigned int sqe_flags; + int personality, ret = 0; + + /* req is partially pre-initialised, see io_preinit_req() */ + req->opcode = READ_ONCE(sqe->opcode); + /* same numerical values with corresponding REQ_F_*, safe to copy */ + req->flags = sqe_flags = READ_ONCE(sqe->flags); + req->user_data = READ_ONCE(sqe->user_data); + req->file = NULL; + req->fixed_rsrc_refs = NULL; + req->task = current; + + /* enforce forwards compatibility on users */ + if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) + return -EINVAL; + if (unlikely(req->opcode >= IORING_OP_LAST)) + return -EINVAL; + if (!io_check_restriction(ctx, req, sqe_flags)) + return -EACCES; + + if ((sqe_flags & IOSQE_BUFFER_SELECT) && + !io_op_defs[req->opcode].buffer_select) + return -EOPNOTSUPP; + if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) + ctx->drain_active = true; + + personality = READ_ONCE(sqe->personality); + if (personality) { + req->creds = xa_load(&ctx->personalities, personality); + if (!req->creds) + return -EINVAL; + get_cred(req->creds); + req->flags |= REQ_F_CREDS; + } + state = &ctx->submit_state; + + /* + * Plug now if we have more than 1 IO left after this, and the target + * is potentially a read/write to block based storage. + */ + if (!state->plug_started && state->ios_left > 1 && + io_op_defs[req->opcode].plug) { + blk_start_plug(&state->plug); + state->plug_started = true; + } + + if (io_op_defs[req->opcode].needs_file) { + req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), + (sqe_flags & IOSQE_FIXED_FILE)); + if (unlikely(!req->file)) + ret = -EBADF; + } + + state->ios_left--; + return ret; +} + +static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, + const struct io_uring_sqe *sqe) + __must_hold(&ctx->uring_lock) +{ + struct io_submit_link *link = &ctx->submit_state.link; + int ret; + + ret = io_init_req(ctx, req, sqe); + if (unlikely(ret)) { +fail_req: + /* fail even hard links since we don't submit */ + if (link->head) { + /* + * we can judge a link req is failed or cancelled by if + * REQ_F_FAIL is set, but the head is an exception since + * it may be set REQ_F_FAIL because of other req's failure + * so let's leverage req->result to distinguish if a head + * is set REQ_F_FAIL because of its failure or other req's + * failure so that we can set the correct ret code for it. + * init result here to avoid affecting the normal path. + */ + if (!(link->head->flags & REQ_F_FAIL)) + req_fail_link_node(link->head, -ECANCELED); + } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { + /* + * the current req is a normal req, we should return + * error and thus break the submittion loop. + */ + io_req_complete_failed(req, ret); + return ret; + } + req_fail_link_node(req, ret); + } else { + ret = io_req_prep(req, sqe); + if (unlikely(ret)) + goto fail_req; + } + + /* don't need @sqe from now on */ + trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, + req->flags, true, + ctx->flags & IORING_SETUP_SQPOLL); + + /* + * If we already have a head request, queue this one for async + * submittal once the head completes. If we don't have a head but + * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be + * submitted sync once the chain is complete. If none of those + * conditions are true (normal request), then just queue it. + */ + if (link->head) { + struct io_kiocb *head = link->head; + + if (!(req->flags & REQ_F_FAIL)) { + ret = io_req_prep_async(req); + if (unlikely(ret)) { + req_fail_link_node(req, ret); + if (!(head->flags & REQ_F_FAIL)) + req_fail_link_node(head, -ECANCELED); + } + } + trace_io_uring_link(ctx, req, head); + link->last->link = req; + link->last = req; + + /* last request of a link, enqueue the link */ + if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { + link->head = NULL; + io_queue_sqe(head); + } + } else { + if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { + link->head = req; + link->last = req; + } else { + io_queue_sqe(req); + } + } + + return 0; +} + +/* + * Batched submission is done, ensure local IO is flushed out. + */ +static void io_submit_state_end(struct io_submit_state *state, + struct io_ring_ctx *ctx) +{ + if (state->link.head) + io_queue_sqe(state->link.head); + if (state->compl_nr) + io_submit_flush_completions(ctx); + if (state->plug_started) + blk_finish_plug(&state->plug); +} + +/* + * Start submission side cache. + */ +static void io_submit_state_start(struct io_submit_state *state, + unsigned int max_ios) +{ + state->plug_started = false; + state->ios_left = max_ios; + /* set only head, no need to init link_last in advance */ + state->link.head = NULL; +} + +static void io_commit_sqring(struct io_ring_ctx *ctx) +{ + struct io_rings *rings = ctx->rings; + + /* + * Ensure any loads from the SQEs are done at this point, + * since once we write the new head, the application could + * write new data to them. + */ + smp_store_release(&rings->sq.head, ctx->cached_sq_head); +} + +/* + * Fetch an sqe, if one is available. Note this returns a pointer to memory + * that is mapped by userspace. This means that care needs to be taken to + * ensure that reads are stable, as we cannot rely on userspace always + * being a good citizen. If members of the sqe are validated and then later + * used, it's important that those reads are done through READ_ONCE() to + * prevent a re-load down the line. + */ +static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) +{ + unsigned head, mask = ctx->sq_entries - 1; + unsigned sq_idx = ctx->cached_sq_head++ & mask; + + /* + * The cached sq head (or cq tail) serves two purposes: + * + * 1) allows us to batch the cost of updating the user visible + * head updates. + * 2) allows the kernel side to track the head on its own, even + * though the application is the one updating it. + */ + head = READ_ONCE(ctx->sq_array[sq_idx]); + if (likely(head < ctx->sq_entries)) + return &ctx->sq_sqes[head]; + + /* drop invalid entries */ + ctx->cq_extra--; + WRITE_ONCE(ctx->rings->sq_dropped, + READ_ONCE(ctx->rings->sq_dropped) + 1); + return NULL; +} + +static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) + __must_hold(&ctx->uring_lock) +{ + int submitted = 0; + + /* make sure SQ entry isn't read before tail */ + nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); + if (!percpu_ref_tryget_many(&ctx->refs, nr)) + return -EAGAIN; + io_get_task_refs(nr); + + io_submit_state_start(&ctx->submit_state, nr); + while (submitted < nr) { + const struct io_uring_sqe *sqe; + struct io_kiocb *req; + + req = io_alloc_req(ctx); + if (unlikely(!req)) { + if (!submitted) + submitted = -EAGAIN; + break; + } + sqe = io_get_sqe(ctx); + if (unlikely(!sqe)) { + list_add(&req->inflight_entry, &ctx->submit_state.free_list); + break; + } + /* will complete beyond this point, count as submitted */ + submitted++; + if (io_submit_sqe(ctx, req, sqe)) + break; + } + + if (unlikely(submitted != nr)) { + int ref_used = (submitted == -EAGAIN) ? 0 : submitted; + int unused = nr - ref_used; + + current->io_uring->cached_refs += unused; + percpu_ref_put_many(&ctx->refs, unused); + } + + io_submit_state_end(&ctx->submit_state, ctx); + /* Commit SQ ring head once we've consumed and submitted all SQEs */ + io_commit_sqring(ctx); + + return submitted; +} + +static inline bool io_sqd_events_pending(struct io_sq_data *sqd) +{ + return READ_ONCE(sqd->state); +} + +static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) +{ + /* Tell userspace we may need a wakeup call */ + spin_lock(&ctx->completion_lock); + WRITE_ONCE(ctx->rings->sq_flags, + ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); + spin_unlock(&ctx->completion_lock); +} + +static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) +{ + spin_lock(&ctx->completion_lock); + WRITE_ONCE(ctx->rings->sq_flags, + ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); + spin_unlock(&ctx->completion_lock); +} + +static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) +{ + unsigned int to_submit; + int ret = 0; + + to_submit = io_sqring_entries(ctx); + /* if we're handling multiple rings, cap submit size for fairness */ + if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) + to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; + + if (!list_empty(&ctx->iopoll_list) || to_submit) { + unsigned nr_events = 0; + const struct cred *creds = NULL; + + if (ctx->sq_creds != current_cred()) + creds = override_creds(ctx->sq_creds); + + mutex_lock(&ctx->uring_lock); + if (!list_empty(&ctx->iopoll_list)) + io_do_iopoll(ctx, &nr_events, 0); + + /* + * Don't submit if refs are dying, good for io_uring_register(), + * but also it is relied upon by io_ring_exit_work() + */ + if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && + !(ctx->flags & IORING_SETUP_R_DISABLED)) + ret = io_submit_sqes(ctx, to_submit); + mutex_unlock(&ctx->uring_lock); + + if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) + wake_up(&ctx->sqo_sq_wait); + if (creds) + revert_creds(creds); + } + + return ret; +} + +static void io_sqd_update_thread_idle(struct io_sq_data *sqd) +{ + struct io_ring_ctx *ctx; + unsigned sq_thread_idle = 0; + + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) + sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); + sqd->sq_thread_idle = sq_thread_idle; +} + +static bool io_sqd_handle_event(struct io_sq_data *sqd) +{ + bool did_sig = false; + struct ksignal ksig; + + if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || + signal_pending(current)) { + mutex_unlock(&sqd->lock); + if (signal_pending(current)) + did_sig = get_signal(&ksig); + cond_resched(); + mutex_lock(&sqd->lock); + } + return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); +} + +static int io_sq_thread(void *data) +{ + struct io_sq_data *sqd = data; + struct io_ring_ctx *ctx; + unsigned long timeout = 0; + char buf[TASK_COMM_LEN]; + DEFINE_WAIT(wait); + + snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); + set_task_comm(current, buf); + + if (sqd->sq_cpu != -1) + set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); + else + set_cpus_allowed_ptr(current, cpu_online_mask); + current->flags |= PF_NO_SETAFFINITY; + + mutex_lock(&sqd->lock); + while (1) { + bool cap_entries, sqt_spin = false; + + if (io_sqd_events_pending(sqd) || signal_pending(current)) { + if (io_sqd_handle_event(sqd)) + break; + timeout = jiffies + sqd->sq_thread_idle; + } + + cap_entries = !list_is_singular(&sqd->ctx_list); + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { + int ret = __io_sq_thread(ctx, cap_entries); + + if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) + sqt_spin = true; + } + if (io_run_task_work()) + sqt_spin = true; + + if (sqt_spin || !time_after(jiffies, timeout)) { + cond_resched(); + if (sqt_spin) + timeout = jiffies + sqd->sq_thread_idle; + continue; + } + + prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); + if (!io_sqd_events_pending(sqd) && !current->task_works) { + bool needs_sched = true; + + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { + io_ring_set_wakeup_flag(ctx); + + if ((ctx->flags & IORING_SETUP_IOPOLL) && + !list_empty_careful(&ctx->iopoll_list)) { + needs_sched = false; + break; + } + if (io_sqring_entries(ctx)) { + needs_sched = false; + break; + } + } + + if (needs_sched) { + mutex_unlock(&sqd->lock); + schedule(); + mutex_lock(&sqd->lock); + } + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) + io_ring_clear_wakeup_flag(ctx); + } + + finish_wait(&sqd->wait, &wait); + timeout = jiffies + sqd->sq_thread_idle; + } + + io_uring_cancel_generic(true, sqd); + sqd->thread = NULL; + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) + io_ring_set_wakeup_flag(ctx); + io_run_task_work(); + mutex_unlock(&sqd->lock); + + complete(&sqd->exited); + do_exit(0); +} + +struct io_wait_queue { + struct wait_queue_entry wq; + struct io_ring_ctx *ctx; + unsigned cq_tail; + unsigned nr_timeouts; +}; + +static inline bool io_should_wake(struct io_wait_queue *iowq) +{ + struct io_ring_ctx *ctx = iowq->ctx; + int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; + + /* + * Wake up if we have enough events, or if a timeout occurred since we + * started waiting. For timeouts, we always want to return to userspace, + * regardless of event count. + */ + return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; +} + +static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, + int wake_flags, void *key) +{ + struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, + wq); + + /* + * Cannot safely flush overflowed CQEs from here, ensure we wake up + * the task, and the next invocation will do it. + */ + if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) + return autoremove_wake_function(curr, mode, wake_flags, key); + return -1; +} + +static int io_run_task_work_sig(void) +{ + if (io_run_task_work()) + return 1; + if (!signal_pending(current)) + return 0; + if (test_thread_flag(TIF_NOTIFY_SIGNAL)) + return -ERESTARTSYS; + return -EINTR; +} + +/* when returns >0, the caller should retry */ +static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, + struct io_wait_queue *iowq, + ktime_t timeout) +{ + int ret; + + /* make sure we run task_work before checking for signals */ + ret = io_run_task_work_sig(); + if (ret || io_should_wake(iowq)) + return ret; + /* let the caller flush overflows, retry */ + if (test_bit(0, &ctx->check_cq_overflow)) + return 1; + + if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) + return -ETIME; + return 1; +} + +/* + * Wait until events become available, if we don't already have some. The + * application must reap them itself, as they reside on the shared cq ring. + */ +static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, + const sigset_t __user *sig, size_t sigsz, + struct __kernel_timespec __user *uts) +{ + struct io_wait_queue iowq; + struct io_rings *rings = ctx->rings; + ktime_t timeout = KTIME_MAX; + int ret; + + do { + io_cqring_overflow_flush(ctx); + if (io_cqring_events(ctx) >= min_events) + return 0; + if (!io_run_task_work()) + break; + } while (1); + + if (uts) { + struct timespec64 ts; + + if (get_timespec64(&ts, uts)) + return -EFAULT; + timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); + } + + if (sig) { +#ifdef CONFIG_COMPAT + if (in_compat_syscall()) + ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, + sigsz); + else +#endif + ret = set_user_sigmask(sig, sigsz); + + if (ret) + return ret; + } + + init_waitqueue_func_entry(&iowq.wq, io_wake_function); + iowq.wq.private = current; + INIT_LIST_HEAD(&iowq.wq.entry); + iowq.ctx = ctx; + iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); + iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; + + trace_io_uring_cqring_wait(ctx, min_events); + do { + /* if we can't even flush overflow, don't wait for more */ + if (!io_cqring_overflow_flush(ctx)) { + ret = -EBUSY; + break; + } + prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, + TASK_INTERRUPTIBLE); + ret = io_cqring_wait_schedule(ctx, &iowq, timeout); + finish_wait(&ctx->cq_wait, &iowq.wq); + cond_resched(); + } while (ret > 0); + + restore_saved_sigmask_unless(ret == -EINTR); + + return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; +} + +static void io_free_page_table(void **table, size_t size) +{ + unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); + + for (i = 0; i < nr_tables; i++) + kfree(table[i]); + kfree(table); +} + +static void **io_alloc_page_table(size_t size) +{ + unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); + size_t init_size = size; + void **table; + + table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); + if (!table) + return NULL; + + for (i = 0; i < nr_tables; i++) { + unsigned int this_size = min_t(size_t, size, PAGE_SIZE); + + table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); + if (!table[i]) { + io_free_page_table(table, init_size); + return NULL; + } + size -= this_size; + } + return table; +} + +static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) +{ + percpu_ref_exit(&ref_node->refs); + kfree(ref_node); +} + +static void io_rsrc_node_ref_zero(struct percpu_ref *ref) +{ + struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); + struct io_ring_ctx *ctx = node->rsrc_data->ctx; + unsigned long flags; + bool first_add = false; + unsigned long delay = HZ; + + spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); + node->done = true; + + /* if we are mid-quiesce then do not delay */ + if (node->rsrc_data->quiesce) + delay = 0; + + while (!list_empty(&ctx->rsrc_ref_list)) { + node = list_first_entry(&ctx->rsrc_ref_list, + struct io_rsrc_node, node); + /* recycle ref nodes in order */ + if (!node->done) + break; + list_del(&node->node); + first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); + } + spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); + + if (first_add) + mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); +} + +static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) +{ + struct io_rsrc_node *ref_node; + + ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); + if (!ref_node) + return NULL; + + if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, + 0, GFP_KERNEL)) { + kfree(ref_node); + return NULL; + } + INIT_LIST_HEAD(&ref_node->node); + INIT_LIST_HEAD(&ref_node->rsrc_list); + ref_node->done = false; + return ref_node; +} + +static void io_rsrc_node_switch(struct io_ring_ctx *ctx, + struct io_rsrc_data *data_to_kill) +{ + WARN_ON_ONCE(!ctx->rsrc_backup_node); + WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); + + if (data_to_kill) { + struct io_rsrc_node *rsrc_node = ctx->rsrc_node; + + rsrc_node->rsrc_data = data_to_kill; + spin_lock_irq(&ctx->rsrc_ref_lock); + list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); + spin_unlock_irq(&ctx->rsrc_ref_lock); + + atomic_inc(&data_to_kill->refs); + percpu_ref_kill(&rsrc_node->refs); + ctx->rsrc_node = NULL; + } + + if (!ctx->rsrc_node) { + ctx->rsrc_node = ctx->rsrc_backup_node; + ctx->rsrc_backup_node = NULL; + } +} + +static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) +{ + if (ctx->rsrc_backup_node) + return 0; + ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); + return ctx->rsrc_backup_node ? 0 : -ENOMEM; +} + +static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) +{ + int ret; + + /* As we may drop ->uring_lock, other task may have started quiesce */ + if (data->quiesce) + return -ENXIO; + + data->quiesce = true; + do { + ret = io_rsrc_node_switch_start(ctx); + if (ret) + break; + io_rsrc_node_switch(ctx, data); + + /* kill initial ref, already quiesced if zero */ + if (atomic_dec_and_test(&data->refs)) + break; + mutex_unlock(&ctx->uring_lock); + flush_delayed_work(&ctx->rsrc_put_work); + ret = wait_for_completion_interruptible(&data->done); + if (!ret) { + mutex_lock(&ctx->uring_lock); + if (atomic_read(&data->refs) > 0) { + /* + * it has been revived by another thread while + * we were unlocked + */ + mutex_unlock(&ctx->uring_lock); + } else { + break; + } + } + + atomic_inc(&data->refs); + /* wait for all works potentially completing data->done */ + flush_delayed_work(&ctx->rsrc_put_work); + reinit_completion(&data->done); + + ret = io_run_task_work_sig(); + mutex_lock(&ctx->uring_lock); + } while (ret >= 0); + data->quiesce = false; + + return ret; +} + +static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) +{ + unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; + unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; + + return &data->tags[table_idx][off]; +} + +static void io_rsrc_data_free(struct io_rsrc_data *data) +{ + size_t size = data->nr * sizeof(data->tags[0][0]); + + if (data->tags) + io_free_page_table((void **)data->tags, size); + kfree(data); +} + +static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, + u64 __user *utags, unsigned nr, + struct io_rsrc_data **pdata) +{ + struct io_rsrc_data *data; + int ret = -ENOMEM; + unsigned i; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); + if (!data->tags) { + kfree(data); + return -ENOMEM; + } + + data->nr = nr; + data->ctx = ctx; + data->do_put = do_put; + if (utags) { + ret = -EFAULT; + for (i = 0; i < nr; i++) { + u64 *tag_slot = io_get_tag_slot(data, i); + + if (copy_from_user(tag_slot, &utags[i], + sizeof(*tag_slot))) + goto fail; + } + } + + atomic_set(&data->refs, 1); + init_completion(&data->done); + *pdata = data; + return 0; +fail: + io_rsrc_data_free(data); + return ret; +} + +static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) +{ + table->files = kvcalloc(nr_files, sizeof(table->files[0]), + GFP_KERNEL_ACCOUNT); + return !!table->files; +} + +static void io_free_file_tables(struct io_file_table *table) +{ + kvfree(table->files); + table->files = NULL; +} + +static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) +{ +#if defined(CONFIG_UNIX) + if (ctx->ring_sock) { + struct sock *sock = ctx->ring_sock->sk; + struct sk_buff *skb; + + while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) + kfree_skb(skb); + } +#else + int i; + + for (i = 0; i < ctx->nr_user_files; i++) { + struct file *file; + + file = io_file_from_index(ctx, i); + if (file) + fput(file); + } +#endif + io_free_file_tables(&ctx->file_table); + io_rsrc_data_free(ctx->file_data); + ctx->file_data = NULL; + ctx->nr_user_files = 0; +} + +static int io_sqe_files_unregister(struct io_ring_ctx *ctx) +{ + unsigned nr = ctx->nr_user_files; + int ret; + + if (!ctx->file_data) + return -ENXIO; + + /* + * Quiesce may unlock ->uring_lock, and while it's not held + * prevent new requests using the table. + */ + ctx->nr_user_files = 0; + ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); + ctx->nr_user_files = nr; + if (!ret) + __io_sqe_files_unregister(ctx); + return ret; +} + +static void io_sq_thread_unpark(struct io_sq_data *sqd) + __releases(&sqd->lock) +{ + WARN_ON_ONCE(sqd->thread == current); + + /* + * Do the dance but not conditional clear_bit() because it'd race with + * other threads incrementing park_pending and setting the bit. + */ + clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); + if (atomic_dec_return(&sqd->park_pending)) + set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); + mutex_unlock(&sqd->lock); +} + +static void io_sq_thread_park(struct io_sq_data *sqd) + __acquires(&sqd->lock) +{ + WARN_ON_ONCE(sqd->thread == current); + + atomic_inc(&sqd->park_pending); + set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); + mutex_lock(&sqd->lock); + if (sqd->thread) + wake_up_process(sqd->thread); +} + +static void io_sq_thread_stop(struct io_sq_data *sqd) +{ + WARN_ON_ONCE(sqd->thread == current); + WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); + + set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); + mutex_lock(&sqd->lock); + if (sqd->thread) + wake_up_process(sqd->thread); + mutex_unlock(&sqd->lock); + wait_for_completion(&sqd->exited); +} + +static void io_put_sq_data(struct io_sq_data *sqd) +{ + if (refcount_dec_and_test(&sqd->refs)) { + WARN_ON_ONCE(atomic_read(&sqd->park_pending)); + + io_sq_thread_stop(sqd); + kfree(sqd); + } +} + +static void io_sq_thread_finish(struct io_ring_ctx *ctx) +{ + struct io_sq_data *sqd = ctx->sq_data; + + if (sqd) { + io_sq_thread_park(sqd); + list_del_init(&ctx->sqd_list); + io_sqd_update_thread_idle(sqd); + io_sq_thread_unpark(sqd); + + io_put_sq_data(sqd); + ctx->sq_data = NULL; + } +} + +static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) +{ + struct io_ring_ctx *ctx_attach; + struct io_sq_data *sqd; + struct fd f; + + f = fdget(p->wq_fd); + if (!f.file) + return ERR_PTR(-ENXIO); + if (f.file->f_op != &io_uring_fops) { + fdput(f); + return ERR_PTR(-EINVAL); + } + + ctx_attach = f.file->private_data; + sqd = ctx_attach->sq_data; + if (!sqd) { + fdput(f); + return ERR_PTR(-EINVAL); + } + if (sqd->task_tgid != current->tgid) { + fdput(f); + return ERR_PTR(-EPERM); + } + + refcount_inc(&sqd->refs); + fdput(f); + return sqd; +} + +static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, + bool *attached) +{ + struct io_sq_data *sqd; + + *attached = false; + if (p->flags & IORING_SETUP_ATTACH_WQ) { + sqd = io_attach_sq_data(p); + if (!IS_ERR(sqd)) { + *attached = true; + return sqd; + } + /* fall through for EPERM case, setup new sqd/task */ + if (PTR_ERR(sqd) != -EPERM) + return sqd; + } + + sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); + if (!sqd) + return ERR_PTR(-ENOMEM); + + atomic_set(&sqd->park_pending, 0); + refcount_set(&sqd->refs, 1); + INIT_LIST_HEAD(&sqd->ctx_list); + mutex_init(&sqd->lock); + init_waitqueue_head(&sqd->wait); + init_completion(&sqd->exited); + return sqd; +} + +#if defined(CONFIG_UNIX) +/* + * Ensure the UNIX gc is aware of our file set, so we are certain that + * the io_uring can be safely unregistered on process exit, even if we have + * loops in the file referencing. + */ +static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) +{ + struct sock *sk = ctx->ring_sock->sk; + struct scm_fp_list *fpl; + struct sk_buff *skb; + int i, nr_files; + + fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); + if (!fpl) + return -ENOMEM; + + skb = alloc_skb(0, GFP_KERNEL); + if (!skb) { + kfree(fpl); + return -ENOMEM; + } + + skb->sk = sk; + skb->scm_io_uring = 1; + + nr_files = 0; + fpl->user = get_uid(current_user()); + for (i = 0; i < nr; i++) { + struct file *file = io_file_from_index(ctx, i + offset); + + if (!file) + continue; + fpl->fp[nr_files] = get_file(file); + unix_inflight(fpl->user, fpl->fp[nr_files]); + nr_files++; + } + + if (nr_files) { + fpl->max = SCM_MAX_FD; + fpl->count = nr_files; + UNIXCB(skb).fp = fpl; + skb->destructor = unix_destruct_scm; + refcount_add(skb->truesize, &sk->sk_wmem_alloc); + skb_queue_head(&sk->sk_receive_queue, skb); + + for (i = 0; i < nr; i++) { + struct file *file = io_file_from_index(ctx, i + offset); + + if (file) + fput(file); + } + } else { + kfree_skb(skb); + free_uid(fpl->user); + kfree(fpl); + } + + return 0; +} + +/* + * If UNIX sockets are enabled, fd passing can cause a reference cycle which + * causes regular reference counting to break down. We rely on the UNIX + * garbage collection to take care of this problem for us. + */ +static int io_sqe_files_scm(struct io_ring_ctx *ctx) +{ + unsigned left, total; + int ret = 0; + + total = 0; + left = ctx->nr_user_files; + while (left) { + unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); + + ret = __io_sqe_files_scm(ctx, this_files, total); + if (ret) + break; + left -= this_files; + total += this_files; + } + + if (!ret) + return 0; + + while (total < ctx->nr_user_files) { + struct file *file = io_file_from_index(ctx, total); + + if (file) + fput(file); + total++; + } + + return ret; +} +#else +static int io_sqe_files_scm(struct io_ring_ctx *ctx) +{ + return 0; +} +#endif + +static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) +{ + struct file *file = prsrc->file; +#if defined(CONFIG_UNIX) + struct sock *sock = ctx->ring_sock->sk; + struct sk_buff_head list, *head = &sock->sk_receive_queue; + struct sk_buff *skb; + int i; + + __skb_queue_head_init(&list); + + /* + * Find the skb that holds this file in its SCM_RIGHTS. When found, + * remove this entry and rearrange the file array. + */ + skb = skb_dequeue(head); + while (skb) { + struct scm_fp_list *fp; + + fp = UNIXCB(skb).fp; + for (i = 0; i < fp->count; i++) { + int left; + + if (fp->fp[i] != file) + continue; + + unix_notinflight(fp->user, fp->fp[i]); + left = fp->count - 1 - i; + if (left) { + memmove(&fp->fp[i], &fp->fp[i + 1], + left * sizeof(struct file *)); + } + fp->count--; + if (!fp->count) { + kfree_skb(skb); + skb = NULL; + } else { + __skb_queue_tail(&list, skb); + } + fput(file); + file = NULL; + break; + } + + if (!file) + break; + + __skb_queue_tail(&list, skb); + + skb = skb_dequeue(head); + } + + if (skb_peek(&list)) { + spin_lock_irq(&head->lock); + while ((skb = __skb_dequeue(&list)) != NULL) + __skb_queue_tail(head, skb); + spin_unlock_irq(&head->lock); + } +#else + fput(file); +#endif +} + +static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) +{ + struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; + struct io_ring_ctx *ctx = rsrc_data->ctx; + struct io_rsrc_put *prsrc, *tmp; + + list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { + list_del(&prsrc->list); + + if (prsrc->tag) { + bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; + + io_ring_submit_lock(ctx, lock_ring); + spin_lock(&ctx->completion_lock); + io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + io_cqring_ev_posted(ctx); + io_ring_submit_unlock(ctx, lock_ring); + } + + rsrc_data->do_put(ctx, prsrc); + kfree(prsrc); + } + + io_rsrc_node_destroy(ref_node); + if (atomic_dec_and_test(&rsrc_data->refs)) + complete(&rsrc_data->done); +} + +static void io_rsrc_put_work(struct work_struct *work) +{ + struct io_ring_ctx *ctx; + struct llist_node *node; + + ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); + node = llist_del_all(&ctx->rsrc_put_llist); + + while (node) { + struct io_rsrc_node *ref_node; + struct llist_node *next = node->next; + + ref_node = llist_entry(node, struct io_rsrc_node, llist); + __io_rsrc_put_work(ref_node); + node = next; + } +} + +static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, + unsigned nr_args, u64 __user *tags) +{ + __s32 __user *fds = (__s32 __user *) arg; + struct file *file; + int fd, ret; + unsigned i; + + if (ctx->file_data) + return -EBUSY; + if (!nr_args) + return -EINVAL; + if (nr_args > IORING_MAX_FIXED_FILES) + return -EMFILE; + if (nr_args > rlimit(RLIMIT_NOFILE)) + return -EMFILE; + ret = io_rsrc_node_switch_start(ctx); + if (ret) + return ret; + ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, + &ctx->file_data); + if (ret) + return ret; + + ret = -ENOMEM; + if (!io_alloc_file_tables(&ctx->file_table, nr_args)) + goto out_free; + + for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { + if (copy_from_user(&fd, &fds[i], sizeof(fd))) { + ret = -EFAULT; + goto out_fput; + } + /* allow sparse sets */ + if (fd == -1) { + ret = -EINVAL; + if (unlikely(*io_get_tag_slot(ctx->file_data, i))) + goto out_fput; + continue; + } + + file = fget(fd); + ret = -EBADF; + if (unlikely(!file)) + goto out_fput; + + /* + * Don't allow io_uring instances to be registered. If UNIX + * isn't enabled, then this causes a reference cycle and this + * instance can never get freed. If UNIX is enabled we'll + * handle it just fine, but there's still no point in allowing + * a ring fd as it doesn't support regular read/write anyway. + */ + if (file->f_op == &io_uring_fops) { + fput(file); + goto out_fput; + } + io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); + } + + ret = io_sqe_files_scm(ctx); + if (ret) { + __io_sqe_files_unregister(ctx); + return ret; + } + + io_rsrc_node_switch(ctx, NULL); + return ret; +out_fput: + for (i = 0; i < ctx->nr_user_files; i++) { + file = io_file_from_index(ctx, i); + if (file) + fput(file); + } + io_free_file_tables(&ctx->file_table); + ctx->nr_user_files = 0; +out_free: + io_rsrc_data_free(ctx->file_data); + ctx->file_data = NULL; + return ret; +} + +static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, + int index) +{ +#if defined(CONFIG_UNIX) + struct sock *sock = ctx->ring_sock->sk; + struct sk_buff_head *head = &sock->sk_receive_queue; + struct sk_buff *skb; + + /* + * See if we can merge this file into an existing skb SCM_RIGHTS + * file set. If there's no room, fall back to allocating a new skb + * and filling it in. + */ + spin_lock_irq(&head->lock); + skb = skb_peek(head); + if (skb) { + struct scm_fp_list *fpl = UNIXCB(skb).fp; + + if (fpl->count < SCM_MAX_FD) { + __skb_unlink(skb, head); + spin_unlock_irq(&head->lock); + fpl->fp[fpl->count] = get_file(file); + unix_inflight(fpl->user, fpl->fp[fpl->count]); + fpl->count++; + spin_lock_irq(&head->lock); + __skb_queue_head(head, skb); + } else { + skb = NULL; + } + } + spin_unlock_irq(&head->lock); + + if (skb) { + fput(file); + return 0; + } + + return __io_sqe_files_scm(ctx, 1, index); +#else + return 0; +#endif +} + +static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, + struct io_rsrc_node *node, void *rsrc) +{ + u64 *tag_slot = io_get_tag_slot(data, idx); + struct io_rsrc_put *prsrc; + + prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); + if (!prsrc) + return -ENOMEM; + + prsrc->tag = *tag_slot; + *tag_slot = 0; + prsrc->rsrc = rsrc; + list_add(&prsrc->list, &node->rsrc_list); + return 0; +} + +static int io_install_fixed_file(struct io_kiocb *req, struct file *file, + unsigned int issue_flags, u32 slot_index) +{ + struct io_ring_ctx *ctx = req->ctx; + bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; + bool needs_switch = false; + struct io_fixed_file *file_slot; + int ret = -EBADF; + + io_ring_submit_lock(ctx, !force_nonblock); + if (file->f_op == &io_uring_fops) + goto err; + ret = -ENXIO; + if (!ctx->file_data) + goto err; + ret = -EINVAL; + if (slot_index >= ctx->nr_user_files) + goto err; + + slot_index = array_index_nospec(slot_index, ctx->nr_user_files); + file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); + + if (file_slot->file_ptr) { + struct file *old_file; + + ret = io_rsrc_node_switch_start(ctx); + if (ret) + goto err; + + old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); + ret = io_queue_rsrc_removal(ctx->file_data, slot_index, + ctx->rsrc_node, old_file); + if (ret) + goto err; + file_slot->file_ptr = 0; + needs_switch = true; + } + + *io_get_tag_slot(ctx->file_data, slot_index) = 0; + io_fixed_file_set(file_slot, file); + ret = io_sqe_file_register(ctx, file, slot_index); + if (ret) { + file_slot->file_ptr = 0; + goto err; + } + + ret = 0; +err: + if (needs_switch) + io_rsrc_node_switch(ctx, ctx->file_data); + io_ring_submit_unlock(ctx, !force_nonblock); + if (ret) + fput(file); + return ret; +} + +static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) +{ + unsigned int offset = req->close.file_slot - 1; + struct io_ring_ctx *ctx = req->ctx; + struct io_fixed_file *file_slot; + struct file *file; + int ret; + + io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); + ret = -ENXIO; + if (unlikely(!ctx->file_data)) + goto out; + ret = -EINVAL; + if (offset >= ctx->nr_user_files) + goto out; + ret = io_rsrc_node_switch_start(ctx); + if (ret) + goto out; + + offset = array_index_nospec(offset, ctx->nr_user_files); + file_slot = io_fixed_file_slot(&ctx->file_table, offset); + ret = -EBADF; + if (!file_slot->file_ptr) + goto out; + + file = (struct file *)(file_slot->file_ptr & FFS_MASK); + ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); + if (ret) + goto out; + + file_slot->file_ptr = 0; + io_rsrc_node_switch(ctx, ctx->file_data); + ret = 0; +out: + io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); + return ret; +} + +static int __io_sqe_files_update(struct io_ring_ctx *ctx, + struct io_uring_rsrc_update2 *up, + unsigned nr_args) +{ + u64 __user *tags = u64_to_user_ptr(up->tags); + __s32 __user *fds = u64_to_user_ptr(up->data); + struct io_rsrc_data *data = ctx->file_data; + struct io_fixed_file *file_slot; + struct file *file; + int fd, i, err = 0; + unsigned int done; + bool needs_switch = false; + + if (!ctx->file_data) + return -ENXIO; + if (up->offset + nr_args > ctx->nr_user_files) + return -EINVAL; + + for (done = 0; done < nr_args; done++) { + u64 tag = 0; + + if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || + copy_from_user(&fd, &fds[done], sizeof(fd))) { + err = -EFAULT; + break; + } + if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { + err = -EINVAL; + break; + } + if (fd == IORING_REGISTER_FILES_SKIP) + continue; + + i = array_index_nospec(up->offset + done, ctx->nr_user_files); + file_slot = io_fixed_file_slot(&ctx->file_table, i); + + if (file_slot->file_ptr) { + file = (struct file *)(file_slot->file_ptr & FFS_MASK); + err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); + if (err) + break; + file_slot->file_ptr = 0; + needs_switch = true; + } + if (fd != -1) { + file = fget(fd); + if (!file) { + err = -EBADF; + break; + } + /* + * Don't allow io_uring instances to be registered. If + * UNIX isn't enabled, then this causes a reference + * cycle and this instance can never get freed. If UNIX + * is enabled we'll handle it just fine, but there's + * still no point in allowing a ring fd as it doesn't + * support regular read/write anyway. + */ + if (file->f_op == &io_uring_fops) { + fput(file); + err = -EBADF; + break; + } + *io_get_tag_slot(data, i) = tag; + io_fixed_file_set(file_slot, file); + err = io_sqe_file_register(ctx, file, i); + if (err) { + file_slot->file_ptr = 0; + fput(file); + break; + } + } + } + + if (needs_switch) + io_rsrc_node_switch(ctx, data); + return done ? done : err; +} + +static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, + struct task_struct *task) +{ + struct io_wq_hash *hash; + struct io_wq_data data; + unsigned int concurrency; + + mutex_lock(&ctx->uring_lock); + hash = ctx->hash_map; + if (!hash) { + hash = kzalloc(sizeof(*hash), GFP_KERNEL); + if (!hash) { + mutex_unlock(&ctx->uring_lock); + return ERR_PTR(-ENOMEM); + } + refcount_set(&hash->refs, 1); + init_waitqueue_head(&hash->wait); + ctx->hash_map = hash; + } + mutex_unlock(&ctx->uring_lock); + + data.hash = hash; + data.task = task; + data.free_work = io_wq_free_work; + data.do_work = io_wq_submit_work; + + /* Do QD, or 4 * CPUS, whatever is smallest */ + concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); + + return io_wq_create(concurrency, &data); +} + +static int io_uring_alloc_task_context(struct task_struct *task, + struct io_ring_ctx *ctx) +{ + struct io_uring_task *tctx; + int ret; + + tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); + if (unlikely(!tctx)) + return -ENOMEM; + + ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); + if (unlikely(ret)) { + kfree(tctx); + return ret; + } + + tctx->io_wq = io_init_wq_offload(ctx, task); + if (IS_ERR(tctx->io_wq)) { + ret = PTR_ERR(tctx->io_wq); + percpu_counter_destroy(&tctx->inflight); + kfree(tctx); + return ret; + } + + xa_init(&tctx->xa); + init_waitqueue_head(&tctx->wait); + atomic_set(&tctx->in_idle, 0); + atomic_set(&tctx->inflight_tracked, 0); + task->io_uring = tctx; + spin_lock_init(&tctx->task_lock); + INIT_WQ_LIST(&tctx->task_list); + init_task_work(&tctx->task_work, tctx_task_work); + return 0; +} + +void __io_uring_free(struct task_struct *tsk) +{ + struct io_uring_task *tctx = tsk->io_uring; + + WARN_ON_ONCE(!xa_empty(&tctx->xa)); + WARN_ON_ONCE(tctx->io_wq); + WARN_ON_ONCE(tctx->cached_refs); + + percpu_counter_destroy(&tctx->inflight); + kfree(tctx); + tsk->io_uring = NULL; +} + +static int io_sq_offload_create(struct io_ring_ctx *ctx, + struct io_uring_params *p) +{ + int ret; + + /* Retain compatibility with failing for an invalid attach attempt */ + if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == + IORING_SETUP_ATTACH_WQ) { + struct fd f; + + f = fdget(p->wq_fd); + if (!f.file) + return -ENXIO; + if (f.file->f_op != &io_uring_fops) { + fdput(f); + return -EINVAL; + } + fdput(f); + } + if (ctx->flags & IORING_SETUP_SQPOLL) { + struct task_struct *tsk; + struct io_sq_data *sqd; + bool attached; + + sqd = io_get_sq_data(p, &attached); + if (IS_ERR(sqd)) { + ret = PTR_ERR(sqd); + goto err; + } + + ctx->sq_creds = get_current_cred(); + ctx->sq_data = sqd; + ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); + if (!ctx->sq_thread_idle) + ctx->sq_thread_idle = HZ; + + io_sq_thread_park(sqd); + list_add(&ctx->sqd_list, &sqd->ctx_list); + io_sqd_update_thread_idle(sqd); + /* don't attach to a dying SQPOLL thread, would be racy */ + ret = (attached && !sqd->thread) ? -ENXIO : 0; + io_sq_thread_unpark(sqd); + + if (ret < 0) + goto err; + if (attached) + return 0; + + if (p->flags & IORING_SETUP_SQ_AFF) { + int cpu = p->sq_thread_cpu; + + ret = -EINVAL; + if (cpu >= nr_cpu_ids || !cpu_online(cpu)) + goto err_sqpoll; + sqd->sq_cpu = cpu; + } else { + sqd->sq_cpu = -1; + } + + sqd->task_pid = current->pid; + sqd->task_tgid = current->tgid; + tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); + if (IS_ERR(tsk)) { + ret = PTR_ERR(tsk); + goto err_sqpoll; + } + + sqd->thread = tsk; + ret = io_uring_alloc_task_context(tsk, ctx); + wake_up_new_task(tsk); + if (ret) + goto err; + } else if (p->flags & IORING_SETUP_SQ_AFF) { + /* Can't have SQ_AFF without SQPOLL */ + ret = -EINVAL; + goto err; + } + + return 0; +err_sqpoll: + complete(&ctx->sq_data->exited); +err: + io_sq_thread_finish(ctx); + return ret; +} + +static inline void __io_unaccount_mem(struct user_struct *user, + unsigned long nr_pages) +{ + atomic_long_sub(nr_pages, &user->locked_vm); +} + +static inline int __io_account_mem(struct user_struct *user, + unsigned long nr_pages) +{ + unsigned long page_limit, cur_pages, new_pages; + + /* Don't allow more pages than we can safely lock */ + page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; + + do { + cur_pages = atomic_long_read(&user->locked_vm); + new_pages = cur_pages + nr_pages; + if (new_pages > page_limit) + return -ENOMEM; + } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, + new_pages) != cur_pages); + + return 0; +} + +static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) +{ + if (ctx->user) + __io_unaccount_mem(ctx->user, nr_pages); + + if (ctx->mm_account) + atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); +} + +static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) +{ + int ret; + + if (ctx->user) { + ret = __io_account_mem(ctx->user, nr_pages); + if (ret) + return ret; + } + + if (ctx->mm_account) + atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); + + return 0; +} + +static void io_mem_free(void *ptr) +{ + struct page *page; + + if (!ptr) + return; + + page = virt_to_head_page(ptr); + if (put_page_testzero(page)) + free_compound_page(page); +} + +static void *io_mem_alloc(size_t size) +{ + gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; + + return (void *) __get_free_pages(gfp, get_order(size)); +} + +static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, + size_t *sq_offset) +{ + struct io_rings *rings; + size_t off, sq_array_size; + + off = struct_size(rings, cqes, cq_entries); + if (off == SIZE_MAX) + return SIZE_MAX; + +#ifdef CONFIG_SMP + off = ALIGN(off, SMP_CACHE_BYTES); + if (off == 0) + return SIZE_MAX; +#endif + + if (sq_offset) + *sq_offset = off; + + sq_array_size = array_size(sizeof(u32), sq_entries); + if (sq_array_size == SIZE_MAX) + return SIZE_MAX; + + if (check_add_overflow(off, sq_array_size, &off)) + return SIZE_MAX; + + return off; +} + +static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) +{ + struct io_mapped_ubuf *imu = *slot; + unsigned int i; + + if (imu != ctx->dummy_ubuf) { + for (i = 0; i < imu->nr_bvecs; i++) + unpin_user_page(imu->bvec[i].bv_page); + if (imu->acct_pages) + io_unaccount_mem(ctx, imu->acct_pages); + kvfree(imu); + } + *slot = NULL; +} + +static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) +{ + io_buffer_unmap(ctx, &prsrc->buf); + prsrc->buf = NULL; +} + +static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) +{ + unsigned int i; + + for (i = 0; i < ctx->nr_user_bufs; i++) + io_buffer_unmap(ctx, &ctx->user_bufs[i]); + kfree(ctx->user_bufs); + io_rsrc_data_free(ctx->buf_data); + ctx->user_bufs = NULL; + ctx->buf_data = NULL; + ctx->nr_user_bufs = 0; +} + +static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) +{ + unsigned nr = ctx->nr_user_bufs; + int ret; + + if (!ctx->buf_data) + return -ENXIO; + + /* + * Quiesce may unlock ->uring_lock, and while it's not held + * prevent new requests using the table. + */ + ctx->nr_user_bufs = 0; + ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); + ctx->nr_user_bufs = nr; + if (!ret) + __io_sqe_buffers_unregister(ctx); + return ret; +} + +static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, + void __user *arg, unsigned index) +{ + struct iovec __user *src; + +#ifdef CONFIG_COMPAT + if (ctx->compat) { + struct compat_iovec __user *ciovs; + struct compat_iovec ciov; + + ciovs = (struct compat_iovec __user *) arg; + if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) + return -EFAULT; + + dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); + dst->iov_len = ciov.iov_len; + return 0; + } +#endif + src = (struct iovec __user *) arg; + if (copy_from_user(dst, &src[index], sizeof(*dst))) + return -EFAULT; + return 0; +} + +/* + * Not super efficient, but this is just a registration time. And we do cache + * the last compound head, so generally we'll only do a full search if we don't + * match that one. + * + * We check if the given compound head page has already been accounted, to + * avoid double accounting it. This allows us to account the full size of the + * page, not just the constituent pages of a huge page. + */ +static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, + int nr_pages, struct page *hpage) +{ + int i, j; + + /* check current page array */ + for (i = 0; i < nr_pages; i++) { + if (!PageCompound(pages[i])) + continue; + if (compound_head(pages[i]) == hpage) + return true; + } + + /* check previously registered pages */ + for (i = 0; i < ctx->nr_user_bufs; i++) { + struct io_mapped_ubuf *imu = ctx->user_bufs[i]; + + for (j = 0; j < imu->nr_bvecs; j++) { + if (!PageCompound(imu->bvec[j].bv_page)) + continue; + if (compound_head(imu->bvec[j].bv_page) == hpage) + return true; + } + } + + return false; +} + +static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, + int nr_pages, struct io_mapped_ubuf *imu, + struct page **last_hpage) +{ + int i, ret; + + imu->acct_pages = 0; + for (i = 0; i < nr_pages; i++) { + if (!PageCompound(pages[i])) { + imu->acct_pages++; + } else { + struct page *hpage; + + hpage = compound_head(pages[i]); + if (hpage == *last_hpage) + continue; + *last_hpage = hpage; + if (headpage_already_acct(ctx, pages, i, hpage)) + continue; + imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; + } + } + + if (!imu->acct_pages) + return 0; + + ret = io_account_mem(ctx, imu->acct_pages); + if (ret) + imu->acct_pages = 0; + return ret; +} + +static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, + struct io_mapped_ubuf **pimu, + struct page **last_hpage) +{ + struct io_mapped_ubuf *imu = NULL; + struct vm_area_struct **vmas = NULL; + struct page **pages = NULL; + unsigned long off, start, end, ubuf; + size_t size; + int ret, pret, nr_pages, i; + + if (!iov->iov_base) { + *pimu = ctx->dummy_ubuf; + return 0; + } + + ubuf = (unsigned long) iov->iov_base; + end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; + start = ubuf >> PAGE_SHIFT; + nr_pages = end - start; + + *pimu = NULL; + ret = -ENOMEM; + + pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); + if (!pages) + goto done; + + vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), + GFP_KERNEL); + if (!vmas) + goto done; + + imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); + if (!imu) + goto done; + + ret = 0; + mmap_read_lock(current->mm); + pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, + pages, vmas); + if (pret == nr_pages) { + /* don't support file backed memory */ + for (i = 0; i < nr_pages; i++) { + struct vm_area_struct *vma = vmas[i]; + + if (vma_is_shmem(vma)) + continue; + if (vma->vm_file && + !is_file_hugepages(vma->vm_file)) { + ret = -EOPNOTSUPP; + break; + } + } + } else { + ret = pret < 0 ? pret : -EFAULT; + } + mmap_read_unlock(current->mm); + if (ret) { + /* + * if we did partial map, or found file backed vmas, + * release any pages we did get + */ + if (pret > 0) + unpin_user_pages(pages, pret); + goto done; + } + + ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); + if (ret) { + unpin_user_pages(pages, pret); + goto done; + } + + off = ubuf & ~PAGE_MASK; + size = iov->iov_len; + for (i = 0; i < nr_pages; i++) { + size_t vec_len; + + vec_len = min_t(size_t, size, PAGE_SIZE - off); + imu->bvec[i].bv_page = pages[i]; + imu->bvec[i].bv_len = vec_len; + imu->bvec[i].bv_offset = off; + off = 0; + size -= vec_len; + } + /* store original address for later verification */ + imu->ubuf = ubuf; + imu->ubuf_end = ubuf + iov->iov_len; + imu->nr_bvecs = nr_pages; + *pimu = imu; + ret = 0; +done: + if (ret) + kvfree(imu); + kvfree(pages); + kvfree(vmas); + return ret; +} + +static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) +{ + ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); + return ctx->user_bufs ? 0 : -ENOMEM; +} + +static int io_buffer_validate(struct iovec *iov) +{ + unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); + + /* + * Don't impose further limits on the size and buffer + * constraints here, we'll -EINVAL later when IO is + * submitted if they are wrong. + */ + if (!iov->iov_base) + return iov->iov_len ? -EFAULT : 0; + if (!iov->iov_len) + return -EFAULT; + + /* arbitrary limit, but we need something */ + if (iov->iov_len > SZ_1G) + return -EFAULT; + + if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) + return -EOVERFLOW; + + return 0; +} + +static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, + unsigned int nr_args, u64 __user *tags) +{ + struct page *last_hpage = NULL; + struct io_rsrc_data *data; + int i, ret; + struct iovec iov; + + if (ctx->user_bufs) + return -EBUSY; + if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) + return -EINVAL; + ret = io_rsrc_node_switch_start(ctx); + if (ret) + return ret; + ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); + if (ret) + return ret; + ret = io_buffers_map_alloc(ctx, nr_args); + if (ret) { + io_rsrc_data_free(data); + return ret; + } + + for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { + ret = io_copy_iov(ctx, &iov, arg, i); + if (ret) + break; + ret = io_buffer_validate(&iov); + if (ret) + break; + if (!iov.iov_base && *io_get_tag_slot(data, i)) { + ret = -EINVAL; + break; + } + + ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], + &last_hpage); + if (ret) + break; + } + + WARN_ON_ONCE(ctx->buf_data); + + ctx->buf_data = data; + if (ret) + __io_sqe_buffers_unregister(ctx); + else + io_rsrc_node_switch(ctx, NULL); + return ret; +} + +static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, + struct io_uring_rsrc_update2 *up, + unsigned int nr_args) +{ + u64 __user *tags = u64_to_user_ptr(up->tags); + struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); + struct page *last_hpage = NULL; + bool needs_switch = false; + __u32 done; + int i, err; + + if (!ctx->buf_data) + return -ENXIO; + if (up->offset + nr_args > ctx->nr_user_bufs) + return -EINVAL; + + for (done = 0; done < nr_args; done++) { + struct io_mapped_ubuf *imu; + int offset = up->offset + done; + u64 tag = 0; + + err = io_copy_iov(ctx, &iov, iovs, done); + if (err) + break; + if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { + err = -EFAULT; + break; + } + err = io_buffer_validate(&iov); + if (err) + break; + if (!iov.iov_base && tag) { + err = -EINVAL; + break; + } + err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); + if (err) + break; + + i = array_index_nospec(offset, ctx->nr_user_bufs); + if (ctx->user_bufs[i] != ctx->dummy_ubuf) { + err = io_queue_rsrc_removal(ctx->buf_data, i, + ctx->rsrc_node, ctx->user_bufs[i]); + if (unlikely(err)) { + io_buffer_unmap(ctx, &imu); + break; + } + ctx->user_bufs[i] = NULL; + needs_switch = true; + } + + ctx->user_bufs[i] = imu; + *io_get_tag_slot(ctx->buf_data, offset) = tag; + } + + if (needs_switch) + io_rsrc_node_switch(ctx, ctx->buf_data); + return done ? done : err; +} + +static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) +{ + __s32 __user *fds = arg; + int fd; + + if (ctx->cq_ev_fd) + return -EBUSY; + + if (copy_from_user(&fd, fds, sizeof(*fds))) + return -EFAULT; + + ctx->cq_ev_fd = eventfd_ctx_fdget(fd); + if (IS_ERR(ctx->cq_ev_fd)) { + int ret = PTR_ERR(ctx->cq_ev_fd); + + ctx->cq_ev_fd = NULL; + return ret; + } + + return 0; +} + +static int io_eventfd_unregister(struct io_ring_ctx *ctx) +{ + if (ctx->cq_ev_fd) { + eventfd_ctx_put(ctx->cq_ev_fd); + ctx->cq_ev_fd = NULL; + return 0; + } + + return -ENXIO; +} + +static void io_destroy_buffers(struct io_ring_ctx *ctx) +{ + struct io_buffer *buf; + unsigned long index; + + xa_for_each(&ctx->io_buffers, index, buf) + __io_remove_buffers(ctx, buf, index, -1U); +} + +static void io_req_cache_free(struct list_head *list) +{ + struct io_kiocb *req, *nxt; + + list_for_each_entry_safe(req, nxt, list, inflight_entry) { + list_del(&req->inflight_entry); + kmem_cache_free(req_cachep, req); + } +} + +static void io_req_caches_free(struct io_ring_ctx *ctx) +{ + struct io_submit_state *state = &ctx->submit_state; + + mutex_lock(&ctx->uring_lock); + + if (state->free_reqs) { + kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); + state->free_reqs = 0; + } + + io_flush_cached_locked_reqs(ctx, state); + io_req_cache_free(&state->free_list); + mutex_unlock(&ctx->uring_lock); +} + +static void io_wait_rsrc_data(struct io_rsrc_data *data) +{ + if (data && !atomic_dec_and_test(&data->refs)) + wait_for_completion(&data->done); +} + +static void io_ring_ctx_free(struct io_ring_ctx *ctx) +{ + io_sq_thread_finish(ctx); + + /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ + io_wait_rsrc_data(ctx->buf_data); + io_wait_rsrc_data(ctx->file_data); + + mutex_lock(&ctx->uring_lock); + if (ctx->buf_data) + __io_sqe_buffers_unregister(ctx); + if (ctx->file_data) + __io_sqe_files_unregister(ctx); + if (ctx->rings) + __io_cqring_overflow_flush(ctx, true); + mutex_unlock(&ctx->uring_lock); + io_eventfd_unregister(ctx); + io_destroy_buffers(ctx); + if (ctx->sq_creds) + put_cred(ctx->sq_creds); + + /* there are no registered resources left, nobody uses it */ + if (ctx->rsrc_node) + io_rsrc_node_destroy(ctx->rsrc_node); + if (ctx->rsrc_backup_node) + io_rsrc_node_destroy(ctx->rsrc_backup_node); + flush_delayed_work(&ctx->rsrc_put_work); + + WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); + WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); + +#if defined(CONFIG_UNIX) + if (ctx->ring_sock) { + ctx->ring_sock->file = NULL; /* so that iput() is called */ + sock_release(ctx->ring_sock); + } +#endif + WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); + + if (ctx->mm_account) { + mmdrop(ctx->mm_account); + ctx->mm_account = NULL; + } + + io_mem_free(ctx->rings); + io_mem_free(ctx->sq_sqes); + + percpu_ref_exit(&ctx->refs); + free_uid(ctx->user); + io_req_caches_free(ctx); + if (ctx->hash_map) + io_wq_put_hash(ctx->hash_map); + kfree(ctx->cancel_hash); + kfree(ctx->dummy_ubuf); + kfree(ctx); +} + +static __poll_t io_uring_poll(struct file *file, poll_table *wait) +{ + struct io_ring_ctx *ctx = file->private_data; + __poll_t mask = 0; + + poll_wait(file, &ctx->poll_wait, wait); + /* + * synchronizes with barrier from wq_has_sleeper call in + * io_commit_cqring + */ + smp_rmb(); + if (!io_sqring_full(ctx)) + mask |= EPOLLOUT | EPOLLWRNORM; + + /* + * Don't flush cqring overflow list here, just do a simple check. + * Otherwise there could possible be ABBA deadlock: + * CPU0 CPU1 + * ---- ---- + * lock(&ctx->uring_lock); + * lock(&ep->mtx); + * lock(&ctx->uring_lock); + * lock(&ep->mtx); + * + * Users may get EPOLLIN meanwhile seeing nothing in cqring, this + * pushs them to do the flush. + */ + if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) + mask |= EPOLLIN | EPOLLRDNORM; + + return mask; +} + +static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) +{ + const struct cred *creds; + + creds = xa_erase(&ctx->personalities, id); + if (creds) { + put_cred(creds); + return 0; + } + + return -EINVAL; +} + +struct io_tctx_exit { + struct callback_head task_work; + struct completion completion; + struct io_ring_ctx *ctx; +}; + +static void io_tctx_exit_cb(struct callback_head *cb) +{ + struct io_uring_task *tctx = current->io_uring; + struct io_tctx_exit *work; + + work = container_of(cb, struct io_tctx_exit, task_work); + /* + * When @in_idle, we're in cancellation and it's racy to remove the + * node. It'll be removed by the end of cancellation, just ignore it. + * tctx can be NULL if the queueing of this task_work raced with + * work cancelation off the exec path. + */ + if (tctx && !atomic_read(&tctx->in_idle)) + io_uring_del_tctx_node((unsigned long)work->ctx); + complete(&work->completion); +} + +static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) +{ + struct io_kiocb *req = container_of(work, struct io_kiocb, work); + + return req->ctx == data; +} + +static void io_ring_exit_work(struct work_struct *work) +{ + struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); + unsigned long timeout = jiffies + HZ * 60 * 5; + unsigned long interval = HZ / 20; + struct io_tctx_exit exit; + struct io_tctx_node *node; + int ret; + + /* + * If we're doing polled IO and end up having requests being + * submitted async (out-of-line), then completions can come in while + * we're waiting for refs to drop. We need to reap these manually, + * as nobody else will be looking for them. + */ + do { + io_uring_try_cancel_requests(ctx, NULL, true); + if (ctx->sq_data) { + struct io_sq_data *sqd = ctx->sq_data; + struct task_struct *tsk; + + io_sq_thread_park(sqd); + tsk = sqd->thread; + if (tsk && tsk->io_uring && tsk->io_uring->io_wq) + io_wq_cancel_cb(tsk->io_uring->io_wq, + io_cancel_ctx_cb, ctx, true); + io_sq_thread_unpark(sqd); + } + + if (WARN_ON_ONCE(time_after(jiffies, timeout))) { + /* there is little hope left, don't run it too often */ + interval = HZ * 60; + } + } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); + + init_completion(&exit.completion); + init_task_work(&exit.task_work, io_tctx_exit_cb); + exit.ctx = ctx; + /* + * Some may use context even when all refs and requests have been put, + * and they are free to do so while still holding uring_lock or + * completion_lock, see io_req_task_submit(). Apart from other work, + * this lock/unlock section also waits them to finish. + */ + mutex_lock(&ctx->uring_lock); + while (!list_empty(&ctx->tctx_list)) { + WARN_ON_ONCE(time_after(jiffies, timeout)); + + node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, + ctx_node); + /* don't spin on a single task if cancellation failed */ + list_rotate_left(&ctx->tctx_list); + ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); + if (WARN_ON_ONCE(ret)) + continue; + wake_up_process(node->task); + + mutex_unlock(&ctx->uring_lock); + wait_for_completion(&exit.completion); + mutex_lock(&ctx->uring_lock); + } + mutex_unlock(&ctx->uring_lock); + spin_lock(&ctx->completion_lock); + spin_unlock(&ctx->completion_lock); + + io_ring_ctx_free(ctx); +} + +/* Returns true if we found and killed one or more timeouts */ +static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, + bool cancel_all) +{ + struct io_kiocb *req, *tmp; + int canceled = 0; + + spin_lock(&ctx->completion_lock); + spin_lock_irq(&ctx->timeout_lock); + list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { + if (io_match_task(req, tsk, cancel_all)) { + io_kill_timeout(req, -ECANCELED); + canceled++; + } + } + spin_unlock_irq(&ctx->timeout_lock); + if (canceled != 0) + io_commit_cqring(ctx); + spin_unlock(&ctx->completion_lock); + if (canceled != 0) + io_cqring_ev_posted(ctx); + return canceled != 0; +} + +static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) +{ + unsigned long index; + struct creds *creds; + + mutex_lock(&ctx->uring_lock); + percpu_ref_kill(&ctx->refs); + if (ctx->rings) + __io_cqring_overflow_flush(ctx, true); + xa_for_each(&ctx->personalities, index, creds) + io_unregister_personality(ctx, index); + mutex_unlock(&ctx->uring_lock); + + io_kill_timeouts(ctx, NULL, true); + io_poll_remove_all(ctx, NULL, true); + + /* if we failed setting up the ctx, we might not have any rings */ + io_iopoll_try_reap_events(ctx); + + INIT_WORK(&ctx->exit_work, io_ring_exit_work); + /* + * Use system_unbound_wq to avoid spawning tons of event kworkers + * if we're exiting a ton of rings at the same time. It just adds + * noise and overhead, there's no discernable change in runtime + * over using system_wq. + */ + queue_work(system_unbound_wq, &ctx->exit_work); +} + +static int io_uring_release(struct inode *inode, struct file *file) +{ + struct io_ring_ctx *ctx = file->private_data; + + file->private_data = NULL; + io_ring_ctx_wait_and_kill(ctx); + return 0; +} + +struct io_task_cancel { + struct task_struct *task; + bool all; +}; + +static bool io_cancel_task_cb(struct io_wq_work *work, void *data) +{ + struct io_kiocb *req = container_of(work, struct io_kiocb, work); + struct io_task_cancel *cancel = data; + + return io_match_task_safe(req, cancel->task, cancel->all); +} + +static bool io_cancel_defer_files(struct io_ring_ctx *ctx, + struct task_struct *task, bool cancel_all) +{ + struct io_defer_entry *de; + LIST_HEAD(list); + + spin_lock(&ctx->completion_lock); + list_for_each_entry_reverse(de, &ctx->defer_list, list) { + if (io_match_task_safe(de->req, task, cancel_all)) { + list_cut_position(&list, &ctx->defer_list, &de->list); + break; + } + } + spin_unlock(&ctx->completion_lock); + if (list_empty(&list)) + return false; + + while (!list_empty(&list)) { + de = list_first_entry(&list, struct io_defer_entry, list); + list_del_init(&de->list); + io_req_complete_failed(de->req, -ECANCELED); + kfree(de); + } + return true; +} + +static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) +{ + struct io_tctx_node *node; + enum io_wq_cancel cret; + bool ret = false; + + mutex_lock(&ctx->uring_lock); + list_for_each_entry(node, &ctx->tctx_list, ctx_node) { + struct io_uring_task *tctx = node->task->io_uring; + + /* + * io_wq will stay alive while we hold uring_lock, because it's + * killed after ctx nodes, which requires to take the lock. + */ + if (!tctx || !tctx->io_wq) + continue; + cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); + ret |= (cret != IO_WQ_CANCEL_NOTFOUND); + } + mutex_unlock(&ctx->uring_lock); + + return ret; +} + +static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, + struct task_struct *task, + bool cancel_all) +{ + struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; + struct io_uring_task *tctx = task ? task->io_uring : NULL; + + while (1) { + enum io_wq_cancel cret; + bool ret = false; + + if (!task) { + ret |= io_uring_try_cancel_iowq(ctx); + } else if (tctx && tctx->io_wq) { + /* + * Cancels requests of all rings, not only @ctx, but + * it's fine as the task is in exit/exec. + */ + cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, + &cancel, true); + ret |= (cret != IO_WQ_CANCEL_NOTFOUND); + } + + /* SQPOLL thread does its own polling */ + if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || + (ctx->sq_data && ctx->sq_data->thread == current)) { + while (!list_empty_careful(&ctx->iopoll_list)) { + io_iopoll_try_reap_events(ctx); + ret = true; + } + } + + ret |= io_cancel_defer_files(ctx, task, cancel_all); + ret |= io_poll_remove_all(ctx, task, cancel_all); + ret |= io_kill_timeouts(ctx, task, cancel_all); + if (task) + ret |= io_run_task_work(); + if (!ret) + break; + cond_resched(); + } +} + +static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) +{ + struct io_uring_task *tctx = current->io_uring; + struct io_tctx_node *node; + int ret; + + if (unlikely(!tctx)) { + ret = io_uring_alloc_task_context(current, ctx); + if (unlikely(ret)) + return ret; + + tctx = current->io_uring; + if (ctx->iowq_limits_set) { + unsigned int limits[2] = { ctx->iowq_limits[0], + ctx->iowq_limits[1], }; + + ret = io_wq_max_workers(tctx->io_wq, limits); + if (ret) + return ret; + } + } + if (!xa_load(&tctx->xa, (unsigned long)ctx)) { + node = kmalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return -ENOMEM; + node->ctx = ctx; + node->task = current; + + ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, + node, GFP_KERNEL)); + if (ret) { + kfree(node); + return ret; + } + + mutex_lock(&ctx->uring_lock); + list_add(&node->ctx_node, &ctx->tctx_list); + mutex_unlock(&ctx->uring_lock); + } + tctx->last = ctx; + return 0; +} + +/* + * Note that this task has used io_uring. We use it for cancelation purposes. + */ +static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) +{ + struct io_uring_task *tctx = current->io_uring; + + if (likely(tctx && tctx->last == ctx)) + return 0; + return __io_uring_add_tctx_node(ctx); +} + +/* + * Remove this io_uring_file -> task mapping. + */ +static void io_uring_del_tctx_node(unsigned long index) +{ + struct io_uring_task *tctx = current->io_uring; + struct io_tctx_node *node; + + if (!tctx) + return; + node = xa_erase(&tctx->xa, index); + if (!node) + return; + + WARN_ON_ONCE(current != node->task); + WARN_ON_ONCE(list_empty(&node->ctx_node)); + + mutex_lock(&node->ctx->uring_lock); + list_del(&node->ctx_node); + mutex_unlock(&node->ctx->uring_lock); + + if (tctx->last == node->ctx) + tctx->last = NULL; + kfree(node); +} + +static void io_uring_clean_tctx(struct io_uring_task *tctx) +{ + struct io_wq *wq = tctx->io_wq; + struct io_tctx_node *node; + unsigned long index; + + xa_for_each(&tctx->xa, index, node) { + io_uring_del_tctx_node(index); + cond_resched(); + } + if (wq) { + /* + * Must be after io_uring_del_task_file() (removes nodes under + * uring_lock) to avoid race with io_uring_try_cancel_iowq(). + */ + io_wq_put_and_exit(wq); + tctx->io_wq = NULL; + } +} + +static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) +{ + if (tracked) + return atomic_read(&tctx->inflight_tracked); + return percpu_counter_sum(&tctx->inflight); +} + +/* + * Find any io_uring ctx that this task has registered or done IO on, and cancel + * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. + */ +static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) +{ + struct io_uring_task *tctx = current->io_uring; + struct io_ring_ctx *ctx; + s64 inflight; + DEFINE_WAIT(wait); + + WARN_ON_ONCE(sqd && sqd->thread != current); + + if (!current->io_uring) + return; + if (tctx->io_wq) + io_wq_exit_start(tctx->io_wq); + + atomic_inc(&tctx->in_idle); + do { + io_uring_drop_tctx_refs(current); + /* read completions before cancelations */ + inflight = tctx_inflight(tctx, !cancel_all); + if (!inflight) + break; + + if (!sqd) { + struct io_tctx_node *node; + unsigned long index; + + xa_for_each(&tctx->xa, index, node) { + /* sqpoll task will cancel all its requests */ + if (node->ctx->sq_data) + continue; + io_uring_try_cancel_requests(node->ctx, current, + cancel_all); + } + } else { + list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) + io_uring_try_cancel_requests(ctx, current, + cancel_all); + } + + prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); + io_run_task_work(); + io_uring_drop_tctx_refs(current); + + /* + * If we've seen completions, retry without waiting. This + * avoids a race where a completion comes in before we did + * prepare_to_wait(). + */ + if (inflight == tctx_inflight(tctx, !cancel_all)) + schedule(); + finish_wait(&tctx->wait, &wait); + } while (1); + + io_uring_clean_tctx(tctx); + if (cancel_all) { + /* + * We shouldn't run task_works after cancel, so just leave + * ->in_idle set for normal exit. + */ + atomic_dec(&tctx->in_idle); + /* for exec all current's requests should be gone, kill tctx */ + __io_uring_free(current); + } +} + +void __io_uring_cancel(bool cancel_all) +{ + io_uring_cancel_generic(cancel_all, NULL); +} + +static void *io_uring_validate_mmap_request(struct file *file, + loff_t pgoff, size_t sz) +{ + struct io_ring_ctx *ctx = file->private_data; + loff_t offset = pgoff << PAGE_SHIFT; + struct page *page; + void *ptr; + + switch (offset) { + case IORING_OFF_SQ_RING: + case IORING_OFF_CQ_RING: + ptr = ctx->rings; + break; + case IORING_OFF_SQES: + ptr = ctx->sq_sqes; + break; + default: + return ERR_PTR(-EINVAL); + } + + page = virt_to_head_page(ptr); + if (sz > page_size(page)) + return ERR_PTR(-EINVAL); + + return ptr; +} + +#ifdef CONFIG_MMU + +static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) +{ + size_t sz = vma->vm_end - vma->vm_start; + unsigned long pfn; + void *ptr; + + ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); + if (IS_ERR(ptr)) + return PTR_ERR(ptr); + + pfn = virt_to_phys(ptr) >> PAGE_SHIFT; + return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); +} + +#else /* !CONFIG_MMU */ + +static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) +{ + return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; +} + +static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) +{ + return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; +} + +static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, + unsigned long addr, unsigned long len, + unsigned long pgoff, unsigned long flags) +{ + void *ptr; + + ptr = io_uring_validate_mmap_request(file, pgoff, len); + if (IS_ERR(ptr)) + return PTR_ERR(ptr); + + return (unsigned long) ptr; +} + +#endif /* !CONFIG_MMU */ + +static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) +{ + DEFINE_WAIT(wait); + + do { + if (!io_sqring_full(ctx)) + break; + prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); + + if (!io_sqring_full(ctx)) + break; + schedule(); + } while (!signal_pending(current)); + + finish_wait(&ctx->sqo_sq_wait, &wait); + return 0; +} + +static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, + struct __kernel_timespec __user **ts, + const sigset_t __user **sig) +{ + struct io_uring_getevents_arg arg; + + /* + * If EXT_ARG isn't set, then we have no timespec and the argp pointer + * is just a pointer to the sigset_t. + */ + if (!(flags & IORING_ENTER_EXT_ARG)) { + *sig = (const sigset_t __user *) argp; + *ts = NULL; + return 0; + } + + /* + * EXT_ARG is set - ensure we agree on the size of it and copy in our + * timespec and sigset_t pointers if good. + */ + if (*argsz != sizeof(arg)) + return -EINVAL; + if (copy_from_user(&arg, argp, sizeof(arg))) + return -EFAULT; + if (arg.pad) + return -EINVAL; + *sig = u64_to_user_ptr(arg.sigmask); + *argsz = arg.sigmask_sz; + *ts = u64_to_user_ptr(arg.ts); + return 0; +} + +SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, + u32, min_complete, u32, flags, const void __user *, argp, + size_t, argsz) +{ + struct io_ring_ctx *ctx; + int submitted = 0; + struct fd f; + long ret; + + io_run_task_work(); + + if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | + IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) + return -EINVAL; + + f = fdget(fd); + if (unlikely(!f.file)) + return -EBADF; + + ret = -EOPNOTSUPP; + if (unlikely(f.file->f_op != &io_uring_fops)) + goto out_fput; + + ret = -ENXIO; + ctx = f.file->private_data; + if (unlikely(!percpu_ref_tryget(&ctx->refs))) + goto out_fput; + + ret = -EBADFD; + if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) + goto out; + + /* + * For SQ polling, the thread will do all submissions and completions. + * Just return the requested submit count, and wake the thread if + * we were asked to. + */ + ret = 0; + if (ctx->flags & IORING_SETUP_SQPOLL) { + io_cqring_overflow_flush(ctx); + + if (unlikely(ctx->sq_data->thread == NULL)) { + ret = -EOWNERDEAD; + goto out; + } + if (flags & IORING_ENTER_SQ_WAKEUP) + wake_up(&ctx->sq_data->wait); + if (flags & IORING_ENTER_SQ_WAIT) { + ret = io_sqpoll_wait_sq(ctx); + if (ret) + goto out; + } + submitted = to_submit; + } else if (to_submit) { + ret = io_uring_add_tctx_node(ctx); + if (unlikely(ret)) + goto out; + mutex_lock(&ctx->uring_lock); + submitted = io_submit_sqes(ctx, to_submit); + mutex_unlock(&ctx->uring_lock); + + if (submitted != to_submit) + goto out; + } + if (flags & IORING_ENTER_GETEVENTS) { + const sigset_t __user *sig; + struct __kernel_timespec __user *ts; + + ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); + if (unlikely(ret)) + goto out; + + min_complete = min(min_complete, ctx->cq_entries); + + /* + * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user + * space applications don't need to do io completion events + * polling again, they can rely on io_sq_thread to do polling + * work, which can reduce cpu usage and uring_lock contention. + */ + if (ctx->flags & IORING_SETUP_IOPOLL && + !(ctx->flags & IORING_SETUP_SQPOLL)) { + ret = io_iopoll_check(ctx, min_complete); + } else { + ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); + } + } + +out: + percpu_ref_put(&ctx->refs); +out_fput: + fdput(f); + return submitted ? submitted : ret; +} + +#ifdef CONFIG_PROC_FS +static int io_uring_show_cred(struct seq_file *m, unsigned int id, + const struct cred *cred) +{ + struct user_namespace *uns = seq_user_ns(m); + struct group_info *gi; + kernel_cap_t cap; + unsigned __capi; + int g; + + seq_printf(m, "%5d\n", id); + seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); + seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); + seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); + seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); + seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); + seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); + seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); + seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); + seq_puts(m, "\n\tGroups:\t"); + gi = cred->group_info; + for (g = 0; g < gi->ngroups; g++) { + seq_put_decimal_ull(m, g ? " " : "", + from_kgid_munged(uns, gi->gid[g])); + } + seq_puts(m, "\n\tCapEff:\t"); + cap = cred->cap_effective; + CAP_FOR_EACH_U32(__capi) + seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); + seq_putc(m, '\n'); + return 0; +} + +static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) +{ + struct io_sq_data *sq = NULL; + bool has_lock; + int i; + + /* + * Avoid ABBA deadlock between the seq lock and the io_uring mutex, + * since fdinfo case grabs it in the opposite direction of normal use + * cases. If we fail to get the lock, we just don't iterate any + * structures that could be going away outside the io_uring mutex. + */ + has_lock = mutex_trylock(&ctx->uring_lock); + + if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { + sq = ctx->sq_data; + if (!sq->thread) + sq = NULL; + } + + seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); + seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); + seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); + for (i = 0; has_lock && i < ctx->nr_user_files; i++) { + struct file *f = io_file_from_index(ctx, i); + + if (f) + seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); + else + seq_printf(m, "%5u: \n", i); + } + seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); + for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { + struct io_mapped_ubuf *buf = ctx->user_bufs[i]; + unsigned int len = buf->ubuf_end - buf->ubuf; + + seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); + } + if (has_lock && !xa_empty(&ctx->personalities)) { + unsigned long index; + const struct cred *cred; + + seq_printf(m, "Personalities:\n"); + xa_for_each(&ctx->personalities, index, cred) + io_uring_show_cred(m, index, cred); + } + seq_printf(m, "PollList:\n"); + spin_lock(&ctx->completion_lock); + for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { + struct hlist_head *list = &ctx->cancel_hash[i]; + struct io_kiocb *req; + + hlist_for_each_entry(req, list, hash_node) + seq_printf(m, " op=%d, task_works=%d\n", req->opcode, + req->task->task_works != NULL); + } + spin_unlock(&ctx->completion_lock); + if (has_lock) + mutex_unlock(&ctx->uring_lock); +} + +static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct io_ring_ctx *ctx = f->private_data; + + if (percpu_ref_tryget(&ctx->refs)) { + __io_uring_show_fdinfo(ctx, m); + percpu_ref_put(&ctx->refs); + } +} +#endif + +static const struct file_operations io_uring_fops = { + .release = io_uring_release, + .mmap = io_uring_mmap, +#ifndef CONFIG_MMU + .get_unmapped_area = io_uring_nommu_get_unmapped_area, + .mmap_capabilities = io_uring_nommu_mmap_capabilities, +#endif + .poll = io_uring_poll, +#ifdef CONFIG_PROC_FS + .show_fdinfo = io_uring_show_fdinfo, +#endif +}; + +static int io_allocate_scq_urings(struct io_ring_ctx *ctx, + struct io_uring_params *p) +{ + struct io_rings *rings; + size_t size, sq_array_offset; + + /* make sure these are sane, as we already accounted them */ + ctx->sq_entries = p->sq_entries; + ctx->cq_entries = p->cq_entries; + + size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); + if (size == SIZE_MAX) + return -EOVERFLOW; + + rings = io_mem_alloc(size); + if (!rings) + return -ENOMEM; + + ctx->rings = rings; + ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); + rings->sq_ring_mask = p->sq_entries - 1; + rings->cq_ring_mask = p->cq_entries - 1; + rings->sq_ring_entries = p->sq_entries; + rings->cq_ring_entries = p->cq_entries; + + size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); + if (size == SIZE_MAX) { + io_mem_free(ctx->rings); + ctx->rings = NULL; + return -EOVERFLOW; + } + + ctx->sq_sqes = io_mem_alloc(size); + if (!ctx->sq_sqes) { + io_mem_free(ctx->rings); + ctx->rings = NULL; + return -ENOMEM; + } + + return 0; +} + +static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) +{ + int ret, fd; + + fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); + if (fd < 0) + return fd; + + ret = io_uring_add_tctx_node(ctx); + if (ret) { + put_unused_fd(fd); + return ret; + } + fd_install(fd, file); + return fd; +} + +/* + * Allocate an anonymous fd, this is what constitutes the application + * visible backing of an io_uring instance. The application mmaps this + * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, + * we have to tie this fd to a socket for file garbage collection purposes. + */ +static struct file *io_uring_get_file(struct io_ring_ctx *ctx) +{ + struct file *file; +#if defined(CONFIG_UNIX) + int ret; + + ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, + &ctx->ring_sock); + if (ret) + return ERR_PTR(ret); +#endif + + file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, + O_RDWR | O_CLOEXEC); +#if defined(CONFIG_UNIX) + if (IS_ERR(file)) { + sock_release(ctx->ring_sock); + ctx->ring_sock = NULL; + } else { + ctx->ring_sock->file = file; + } +#endif + return file; +} + +static int io_uring_create(unsigned entries, struct io_uring_params *p, + struct io_uring_params __user *params) +{ + struct io_ring_ctx *ctx; + struct file *file; + int ret; + + if (!entries) + return -EINVAL; + if (entries > IORING_MAX_ENTRIES) { + if (!(p->flags & IORING_SETUP_CLAMP)) + return -EINVAL; + entries = IORING_MAX_ENTRIES; + } + + /* + * Use twice as many entries for the CQ ring. It's possible for the + * application to drive a higher depth than the size of the SQ ring, + * since the sqes are only used at submission time. This allows for + * some flexibility in overcommitting a bit. If the application has + * set IORING_SETUP_CQSIZE, it will have passed in the desired number + * of CQ ring entries manually. + */ + p->sq_entries = roundup_pow_of_two(entries); + if (p->flags & IORING_SETUP_CQSIZE) { + /* + * If IORING_SETUP_CQSIZE is set, we do the same roundup + * to a power-of-two, if it isn't already. We do NOT impose + * any cq vs sq ring sizing. + */ + if (!p->cq_entries) + return -EINVAL; + if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { + if (!(p->flags & IORING_SETUP_CLAMP)) + return -EINVAL; + p->cq_entries = IORING_MAX_CQ_ENTRIES; + } + p->cq_entries = roundup_pow_of_two(p->cq_entries); + if (p->cq_entries < p->sq_entries) + return -EINVAL; + } else { + p->cq_entries = 2 * p->sq_entries; + } + + ctx = io_ring_ctx_alloc(p); + if (!ctx) + return -ENOMEM; + ctx->compat = in_compat_syscall(); + if (!capable(CAP_IPC_LOCK)) + ctx->user = get_uid(current_user()); + + /* + * This is just grabbed for accounting purposes. When a process exits, + * the mm is exited and dropped before the files, hence we need to hang + * on to this mm purely for the purposes of being able to unaccount + * memory (locked/pinned vm). It's not used for anything else. + */ + mmgrab(current->mm); + ctx->mm_account = current->mm; + + ret = io_allocate_scq_urings(ctx, p); + if (ret) + goto err; + + ret = io_sq_offload_create(ctx, p); + if (ret) + goto err; + /* always set a rsrc node */ + ret = io_rsrc_node_switch_start(ctx); + if (ret) + goto err; + io_rsrc_node_switch(ctx, NULL); + + memset(&p->sq_off, 0, sizeof(p->sq_off)); + p->sq_off.head = offsetof(struct io_rings, sq.head); + p->sq_off.tail = offsetof(struct io_rings, sq.tail); + p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); + p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); + p->sq_off.flags = offsetof(struct io_rings, sq_flags); + p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); + p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; + + memset(&p->cq_off, 0, sizeof(p->cq_off)); + p->cq_off.head = offsetof(struct io_rings, cq.head); + p->cq_off.tail = offsetof(struct io_rings, cq.tail); + p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); + p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); + p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); + p->cq_off.cqes = offsetof(struct io_rings, cqes); + p->cq_off.flags = offsetof(struct io_rings, cq_flags); + + p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | + IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | + IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | + IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | + IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | + IORING_FEAT_RSRC_TAGS; + + if (copy_to_user(params, p, sizeof(*p))) { + ret = -EFAULT; + goto err; + } + + file = io_uring_get_file(ctx); + if (IS_ERR(file)) { + ret = PTR_ERR(file); + goto err; + } + + /* + * Install ring fd as the very last thing, so we don't risk someone + * having closed it before we finish setup + */ + ret = io_uring_install_fd(ctx, file); + if (ret < 0) { + /* fput will clean it up */ + fput(file); + return ret; + } + + trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); + return ret; +err: + io_ring_ctx_wait_and_kill(ctx); + return ret; +} + +/* + * Sets up an aio uring context, and returns the fd. Applications asks for a + * ring size, we return the actual sq/cq ring sizes (among other things) in the + * params structure passed in. + */ +static long io_uring_setup(u32 entries, struct io_uring_params __user *params) +{ + struct io_uring_params p; + int i; + + if (copy_from_user(&p, params, sizeof(p))) + return -EFAULT; + for (i = 0; i < ARRAY_SIZE(p.resv); i++) { + if (p.resv[i]) + return -EINVAL; + } + + if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | + IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | + IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | + IORING_SETUP_R_DISABLED)) + return -EINVAL; + + return io_uring_create(entries, &p, params); +} + +SYSCALL_DEFINE2(io_uring_setup, u32, entries, + struct io_uring_params __user *, params) +{ + return io_uring_setup(entries, params); +} + +static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) +{ + struct io_uring_probe *p; + size_t size; + int i, ret; + + size = struct_size(p, ops, nr_args); + if (size == SIZE_MAX) + return -EOVERFLOW; + p = kzalloc(size, GFP_KERNEL); + if (!p) + return -ENOMEM; + + ret = -EFAULT; + if (copy_from_user(p, arg, size)) + goto out; + ret = -EINVAL; + if (memchr_inv(p, 0, size)) + goto out; + + p->last_op = IORING_OP_LAST - 1; + if (nr_args > IORING_OP_LAST) + nr_args = IORING_OP_LAST; + + for (i = 0; i < nr_args; i++) { + p->ops[i].op = i; + if (!io_op_defs[i].not_supported) + p->ops[i].flags = IO_URING_OP_SUPPORTED; + } + p->ops_len = i; + + ret = 0; + if (copy_to_user(arg, p, size)) + ret = -EFAULT; +out: + kfree(p); + return ret; +} + +static int io_register_personality(struct io_ring_ctx *ctx) +{ + const struct cred *creds; + u32 id; + int ret; + + creds = get_current_cred(); + + ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, + XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); + if (ret < 0) { + put_cred(creds); + return ret; + } + return id; +} + +static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, + unsigned int nr_args) +{ + struct io_uring_restriction *res; + size_t size; + int i, ret; + + /* Restrictions allowed only if rings started disabled */ + if (!(ctx->flags & IORING_SETUP_R_DISABLED)) + return -EBADFD; + + /* We allow only a single restrictions registration */ + if (ctx->restrictions.registered) + return -EBUSY; + + if (!arg || nr_args > IORING_MAX_RESTRICTIONS) + return -EINVAL; + + size = array_size(nr_args, sizeof(*res)); + if (size == SIZE_MAX) + return -EOVERFLOW; + + res = memdup_user(arg, size); + if (IS_ERR(res)) + return PTR_ERR(res); + + ret = 0; + + for (i = 0; i < nr_args; i++) { + switch (res[i].opcode) { + case IORING_RESTRICTION_REGISTER_OP: + if (res[i].register_op >= IORING_REGISTER_LAST) { + ret = -EINVAL; + goto out; + } + + __set_bit(res[i].register_op, + ctx->restrictions.register_op); + break; + case IORING_RESTRICTION_SQE_OP: + if (res[i].sqe_op >= IORING_OP_LAST) { + ret = -EINVAL; + goto out; + } + + __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); + break; + case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: + ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; + break; + case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: + ctx->restrictions.sqe_flags_required = res[i].sqe_flags; + break; + default: + ret = -EINVAL; + goto out; + } + } + +out: + /* Reset all restrictions if an error happened */ + if (ret != 0) + memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); + else + ctx->restrictions.registered = true; + + kfree(res); + return ret; +} + +static int io_register_enable_rings(struct io_ring_ctx *ctx) +{ + if (!(ctx->flags & IORING_SETUP_R_DISABLED)) + return -EBADFD; + + if (ctx->restrictions.registered) + ctx->restricted = 1; + + ctx->flags &= ~IORING_SETUP_R_DISABLED; + if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) + wake_up(&ctx->sq_data->wait); + return 0; +} + +static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, + struct io_uring_rsrc_update2 *up, + unsigned nr_args) +{ + __u32 tmp; + int err; + + if (check_add_overflow(up->offset, nr_args, &tmp)) + return -EOVERFLOW; + err = io_rsrc_node_switch_start(ctx); + if (err) + return err; + + switch (type) { + case IORING_RSRC_FILE: + return __io_sqe_files_update(ctx, up, nr_args); + case IORING_RSRC_BUFFER: + return __io_sqe_buffers_update(ctx, up, nr_args); + } + return -EINVAL; +} + +static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, + unsigned nr_args) +{ + struct io_uring_rsrc_update2 up; + + if (!nr_args) + return -EINVAL; + memset(&up, 0, sizeof(up)); + if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) + return -EFAULT; + if (up.resv || up.resv2) + return -EINVAL; + return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); +} + +static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, + unsigned size, unsigned type) +{ + struct io_uring_rsrc_update2 up; + + if (size != sizeof(up)) + return -EINVAL; + if (copy_from_user(&up, arg, sizeof(up))) + return -EFAULT; + if (!up.nr || up.resv || up.resv2) + return -EINVAL; + return __io_register_rsrc_update(ctx, type, &up, up.nr); +} + +static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, + unsigned int size, unsigned int type) +{ + struct io_uring_rsrc_register rr; + + /* keep it extendible */ + if (size != sizeof(rr)) + return -EINVAL; + + memset(&rr, 0, sizeof(rr)); + if (copy_from_user(&rr, arg, size)) + return -EFAULT; + if (!rr.nr || rr.resv || rr.resv2) + return -EINVAL; + + switch (type) { + case IORING_RSRC_FILE: + return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), + rr.nr, u64_to_user_ptr(rr.tags)); + case IORING_RSRC_BUFFER: + return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), + rr.nr, u64_to_user_ptr(rr.tags)); + } + return -EINVAL; +} + +static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, + unsigned len) +{ + struct io_uring_task *tctx = current->io_uring; + cpumask_var_t new_mask; + int ret; + + if (!tctx || !tctx->io_wq) + return -EINVAL; + + if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) + return -ENOMEM; + + cpumask_clear(new_mask); + if (len > cpumask_size()) + len = cpumask_size(); + + if (in_compat_syscall()) { + ret = compat_get_bitmap(cpumask_bits(new_mask), + (const compat_ulong_t __user *)arg, + len * 8 /* CHAR_BIT */); + } else { + ret = copy_from_user(new_mask, arg, len); + } + + if (ret) { + free_cpumask_var(new_mask); + return -EFAULT; + } + + ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); + free_cpumask_var(new_mask); + return ret; +} + +static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) +{ + struct io_uring_task *tctx = current->io_uring; + + if (!tctx || !tctx->io_wq) + return -EINVAL; + + return io_wq_cpu_affinity(tctx->io_wq, NULL); +} + +static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, + void __user *arg) + __must_hold(&ctx->uring_lock) +{ + struct io_tctx_node *node; + struct io_uring_task *tctx = NULL; + struct io_sq_data *sqd = NULL; + __u32 new_count[2]; + int i, ret; + + if (copy_from_user(new_count, arg, sizeof(new_count))) + return -EFAULT; + for (i = 0; i < ARRAY_SIZE(new_count); i++) + if (new_count[i] > INT_MAX) + return -EINVAL; + + if (ctx->flags & IORING_SETUP_SQPOLL) { + sqd = ctx->sq_data; + if (sqd) { + /* + * Observe the correct sqd->lock -> ctx->uring_lock + * ordering. Fine to drop uring_lock here, we hold + * a ref to the ctx. + */ + refcount_inc(&sqd->refs); + mutex_unlock(&ctx->uring_lock); + mutex_lock(&sqd->lock); + mutex_lock(&ctx->uring_lock); + if (sqd->thread) + tctx = sqd->thread->io_uring; + } + } else { + tctx = current->io_uring; + } + + BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); + + for (i = 0; i < ARRAY_SIZE(new_count); i++) + if (new_count[i]) + ctx->iowq_limits[i] = new_count[i]; + ctx->iowq_limits_set = true; + + ret = -EINVAL; + if (tctx && tctx->io_wq) { + ret = io_wq_max_workers(tctx->io_wq, new_count); + if (ret) + goto err; + } else { + memset(new_count, 0, sizeof(new_count)); + } + + if (sqd) { + mutex_unlock(&sqd->lock); + io_put_sq_data(sqd); + } + + if (copy_to_user(arg, new_count, sizeof(new_count))) + return -EFAULT; + + /* that's it for SQPOLL, only the SQPOLL task creates requests */ + if (sqd) + return 0; + + /* now propagate the restriction to all registered users */ + list_for_each_entry(node, &ctx->tctx_list, ctx_node) { + struct io_uring_task *tctx = node->task->io_uring; + + if (WARN_ON_ONCE(!tctx->io_wq)) + continue; + + for (i = 0; i < ARRAY_SIZE(new_count); i++) + new_count[i] = ctx->iowq_limits[i]; + /* ignore errors, it always returns zero anyway */ + (void)io_wq_max_workers(tctx->io_wq, new_count); + } + return 0; +err: + if (sqd) { + mutex_unlock(&sqd->lock); + io_put_sq_data(sqd); + } + return ret; +} + +static bool io_register_op_must_quiesce(int op) +{ + switch (op) { + case IORING_REGISTER_BUFFERS: + case IORING_UNREGISTER_BUFFERS: + case IORING_REGISTER_FILES: + case IORING_UNREGISTER_FILES: + case IORING_REGISTER_FILES_UPDATE: + case IORING_REGISTER_PROBE: + case IORING_REGISTER_PERSONALITY: + case IORING_UNREGISTER_PERSONALITY: + case IORING_REGISTER_FILES2: + case IORING_REGISTER_FILES_UPDATE2: + case IORING_REGISTER_BUFFERS2: + case IORING_REGISTER_BUFFERS_UPDATE: + case IORING_REGISTER_IOWQ_AFF: + case IORING_UNREGISTER_IOWQ_AFF: + case IORING_REGISTER_IOWQ_MAX_WORKERS: + return false; + default: + return true; + } +} + +static int io_ctx_quiesce(struct io_ring_ctx *ctx) +{ + long ret; + + percpu_ref_kill(&ctx->refs); + + /* + * Drop uring mutex before waiting for references to exit. If another + * thread is currently inside io_uring_enter() it might need to grab the + * uring_lock to make progress. If we hold it here across the drain + * wait, then we can deadlock. It's safe to drop the mutex here, since + * no new references will come in after we've killed the percpu ref. + */ + mutex_unlock(&ctx->uring_lock); + do { + ret = wait_for_completion_interruptible(&ctx->ref_comp); + if (!ret) + break; + ret = io_run_task_work_sig(); + } while (ret >= 0); + mutex_lock(&ctx->uring_lock); + + if (ret) + io_refs_resurrect(&ctx->refs, &ctx->ref_comp); + return ret; +} + +static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, + void __user *arg, unsigned nr_args) + __releases(ctx->uring_lock) + __acquires(ctx->uring_lock) +{ + int ret; + + /* + * We're inside the ring mutex, if the ref is already dying, then + * someone else killed the ctx or is already going through + * io_uring_register(). + */ + if (percpu_ref_is_dying(&ctx->refs)) + return -ENXIO; + + if (ctx->restricted) { + if (opcode >= IORING_REGISTER_LAST) + return -EINVAL; + opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); + if (!test_bit(opcode, ctx->restrictions.register_op)) + return -EACCES; + } + + if (io_register_op_must_quiesce(opcode)) { + ret = io_ctx_quiesce(ctx); + if (ret) + return ret; + } + + switch (opcode) { + case IORING_REGISTER_BUFFERS: + ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); + break; + case IORING_UNREGISTER_BUFFERS: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_sqe_buffers_unregister(ctx); + break; + case IORING_REGISTER_FILES: + ret = io_sqe_files_register(ctx, arg, nr_args, NULL); + break; + case IORING_UNREGISTER_FILES: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_sqe_files_unregister(ctx); + break; + case IORING_REGISTER_FILES_UPDATE: + ret = io_register_files_update(ctx, arg, nr_args); + break; + case IORING_REGISTER_EVENTFD: + case IORING_REGISTER_EVENTFD_ASYNC: + ret = -EINVAL; + if (nr_args != 1) + break; + ret = io_eventfd_register(ctx, arg); + if (ret) + break; + if (opcode == IORING_REGISTER_EVENTFD_ASYNC) + ctx->eventfd_async = 1; + else + ctx->eventfd_async = 0; + break; + case IORING_UNREGISTER_EVENTFD: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_eventfd_unregister(ctx); + break; + case IORING_REGISTER_PROBE: + ret = -EINVAL; + if (!arg || nr_args > 256) + break; + ret = io_probe(ctx, arg, nr_args); + break; + case IORING_REGISTER_PERSONALITY: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_register_personality(ctx); + break; + case IORING_UNREGISTER_PERSONALITY: + ret = -EINVAL; + if (arg) + break; + ret = io_unregister_personality(ctx, nr_args); + break; + case IORING_REGISTER_ENABLE_RINGS: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_register_enable_rings(ctx); + break; + case IORING_REGISTER_RESTRICTIONS: + ret = io_register_restrictions(ctx, arg, nr_args); + break; + case IORING_REGISTER_FILES2: + ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); + break; + case IORING_REGISTER_FILES_UPDATE2: + ret = io_register_rsrc_update(ctx, arg, nr_args, + IORING_RSRC_FILE); + break; + case IORING_REGISTER_BUFFERS2: + ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); + break; + case IORING_REGISTER_BUFFERS_UPDATE: + ret = io_register_rsrc_update(ctx, arg, nr_args, + IORING_RSRC_BUFFER); + break; + case IORING_REGISTER_IOWQ_AFF: + ret = -EINVAL; + if (!arg || !nr_args) + break; + ret = io_register_iowq_aff(ctx, arg, nr_args); + break; + case IORING_UNREGISTER_IOWQ_AFF: + ret = -EINVAL; + if (arg || nr_args) + break; + ret = io_unregister_iowq_aff(ctx); + break; + case IORING_REGISTER_IOWQ_MAX_WORKERS: + ret = -EINVAL; + if (!arg || nr_args != 2) + break; + ret = io_register_iowq_max_workers(ctx, arg); + break; + default: + ret = -EINVAL; + break; + } + + if (io_register_op_must_quiesce(opcode)) { + /* bring the ctx back to life */ + percpu_ref_reinit(&ctx->refs); + reinit_completion(&ctx->ref_comp); + } + return ret; +} + +SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, + void __user *, arg, unsigned int, nr_args) +{ + struct io_ring_ctx *ctx; + long ret = -EBADF; + struct fd f; + + f = fdget(fd); + if (!f.file) + return -EBADF; + + ret = -EOPNOTSUPP; + if (f.file->f_op != &io_uring_fops) + goto out_fput; + + ctx = f.file->private_data; + + io_run_task_work(); + + mutex_lock(&ctx->uring_lock); + ret = __io_uring_register(ctx, opcode, arg, nr_args); + mutex_unlock(&ctx->uring_lock); + trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, + ctx->cq_ev_fd != NULL, ret); +out_fput: + fdput(f); + return ret; +} + +static int __init io_uring_init(void) +{ +#define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ + BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ + BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ +} while (0) + +#define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ + __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) + BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); + BUILD_BUG_SQE_ELEM(0, __u8, opcode); + BUILD_BUG_SQE_ELEM(1, __u8, flags); + BUILD_BUG_SQE_ELEM(2, __u16, ioprio); + BUILD_BUG_SQE_ELEM(4, __s32, fd); + BUILD_BUG_SQE_ELEM(8, __u64, off); + BUILD_BUG_SQE_ELEM(8, __u64, addr2); + BUILD_BUG_SQE_ELEM(16, __u64, addr); + BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); + BUILD_BUG_SQE_ELEM(24, __u32, len); + BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); + BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); + BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); + BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); + BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); + BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); + BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); + BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); + BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); + BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); + BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); + BUILD_BUG_SQE_ELEM(28, __u32, open_flags); + BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); + BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); + BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); + BUILD_BUG_SQE_ELEM(32, __u64, user_data); + BUILD_BUG_SQE_ELEM(40, __u16, buf_index); + BUILD_BUG_SQE_ELEM(40, __u16, buf_group); + BUILD_BUG_SQE_ELEM(42, __u16, personality); + BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); + BUILD_BUG_SQE_ELEM(44, __u32, file_index); + + BUILD_BUG_ON(sizeof(struct io_uring_files_update) != + sizeof(struct io_uring_rsrc_update)); + BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > + sizeof(struct io_uring_rsrc_update2)); + + /* ->buf_index is u16 */ + BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); + + /* should fit into one byte */ + BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); + + BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); + BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); + + req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | + SLAB_ACCOUNT); + return 0; +}; +__initcall(io_uring_init); diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h index 6e36e854b5124..d8fcc139ac05d 100644 --- a/kernel/cgroup/cgroup-internal.h +++ b/kernel/cgroup/cgroup-internal.h @@ -169,7 +169,6 @@ extern struct mutex cgroup_mutex; extern spinlock_t css_set_lock; extern struct cgroup_subsys *cgroup_subsys[]; extern struct list_head cgroup_roots; -extern struct file_system_type cgroup_fs_type; /* iterate across the hierarchies */ #define for_each_root(root) \ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 85be684687b08..bb684fe1b96ed 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -21,7 +21,7 @@ #include #include "../workqueue_internal.h" -#include "../../fs/io-wq.h" +#include "../../io_uring/io-wq.h" #include "../smpboot.h" #include "pelt.h" diff --git a/mm/gup.c b/mm/gup.c index 69e45cbe58f8c..2370565a81dc3 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2721,7 +2721,7 @@ static int gup_pud_range(p4d_t *p4dp, p4d_t p4d, unsigned long addr, unsigned lo next = pud_addr_end(addr, end); if (unlikely(!pud_present(pud))) return 0; - if (unlikely(pud_huge(pud))) { + if (unlikely(pud_huge(pud) || pud_devmap(pud))) { if (!gup_huge_pud(pud, pudp, addr, next, flags, pages, nr)) return 0; diff --git a/mm/khugepaged.c b/mm/khugepaged.c index dd069afd9cb9c..fd25d12e85b33 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1156,6 +1156,7 @@ static void collapse_huge_page(struct mm_struct *mm, _pmd = pmdp_collapse_flush(vma, address, pmd); spin_unlock(pmd_ptl); mmu_notifier_invalidate_range_end(&range); + tlb_remove_table_sync_one(); spin_lock(pte_ptl); isolated = __collapse_huge_page_isolate(vma, address, pte, @@ -1442,6 +1443,7 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) spinlock_t *ptl; int count = 0; int i; + struct mmu_notifier_range range; if (!vma || !vma->vm_file || !range_in_vma(vma, haddr, haddr + HPAGE_PMD_SIZE)) @@ -1456,6 +1458,14 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) if (!hugepage_vma_check(vma, vma->vm_flags | VM_HUGEPAGE)) return; + /* + * Symmetry with retract_page_tables(): Exclude MAP_PRIVATE mappings + * that got written to. Without this, we'd have to also lock the + * anon_vma if one exists. + */ + if (vma->anon_vma) + return; + hpage = find_lock_page(vma->vm_file->f_mapping, linear_page_index(vma, haddr)); if (!hpage) @@ -1468,6 +1478,19 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) if (!pmd) goto drop_hpage; + /* + * We need to lock the mapping so that from here on, only GUP-fast and + * hardware page walks can access the parts of the page tables that + * we're operating on. + */ + i_mmap_lock_write(vma->vm_file->f_mapping); + + /* + * This spinlock should be unnecessary: Nobody else should be accessing + * the page tables under spinlock protection here, only + * lockless_pages_from_mm() and the hardware page walker can access page + * tables while all the high-level locks are held in write mode. + */ start_pte = pte_offset_map_lock(mm, pmd, haddr, &ptl); /* step 1: check all mapped PTEs are to the right huge page */ @@ -1514,12 +1537,17 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) } /* step 4: collapse pmd */ - ptl = pmd_lock(vma->vm_mm, pmd); + mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm, haddr, + haddr + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); _pmd = pmdp_collapse_flush(vma, haddr, pmd); - spin_unlock(ptl); mm_dec_nr_ptes(mm); + tlb_remove_table_sync_one(); + mmu_notifier_invalidate_range_end(&range); pte_free(mm, pmd_pgtable(_pmd)); + i_mmap_unlock_write(vma->vm_file->f_mapping); + drop_hpage: unlock_page(hpage); put_page(hpage); @@ -1527,6 +1555,7 @@ drop_hpage: abort: pte_unmap_unlock(start_pte, ptl); + i_mmap_unlock_write(vma->vm_file->f_mapping); goto drop_hpage; } @@ -1575,7 +1604,8 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) * An alternative would be drop the check, but check that page * table is clear before calling pmdp_collapse_flush() under * ptl. It has higher chance to recover THP for the VMA, but - * has higher cost too. + * has higher cost too. It would also probably require locking + * the anon_vma. */ if (vma->anon_vma) continue; @@ -1597,12 +1627,19 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) */ if (mmap_write_trylock(mm)) { if (!khugepaged_test_exit(mm)) { - spinlock_t *ptl = pmd_lock(mm, pmd); + struct mmu_notifier_range range; + + mmu_notifier_range_init(&range, + MMU_NOTIFY_CLEAR, 0, + NULL, mm, addr, + addr + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); /* assume page table is clear */ _pmd = pmdp_collapse_flush(vma, addr, pmd); - spin_unlock(ptl); mm_dec_nr_ptes(mm); + tlb_remove_table_sync_one(); pte_free(mm, pmd_pgtable(_pmd)); + mmu_notifier_invalidate_range_end(&range); } mmap_write_unlock(mm); } else { diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 971546bb99e04..3d3364cd4ff19 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4789,6 +4789,7 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of, unsigned int efd, cfd; struct fd efile; struct fd cfile; + struct dentry *cdentry; const char *name; char *endp; int ret; @@ -4839,6 +4840,16 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of, if (ret < 0) goto out_put_cfile; + /* + * The control file must be a regular cgroup1 file. As a regular cgroup + * file can't be renamed, it's safe to access its name afterwards. + */ + cdentry = cfile.file->f_path.dentry; + if (cdentry->d_sb->s_type != &cgroup_fs_type || !d_is_reg(cdentry)) { + ret = -EINVAL; + goto out_put_cfile; + } + /* * Determine the event callbacks and set them in @event. This used * to be done via struct cftype but cgroup core no longer knows @@ -4847,7 +4858,7 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of, * * DO NOT ADD NEW FILES. */ - name = cfile.file->f_path.dentry->d_name.name; + name = cdentry->d_name.name; if (!strcmp(name, "memory.usage_in_bytes")) { event->register_event = mem_cgroup_usage_register_event; @@ -4871,7 +4882,7 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of, * automatically removed on cgroup destruction but the removal is * asynchronous, so take an extra ref on @css. */ - cfile_css = css_tryget_online_from_dir(cfile.file->f_path.dentry->d_parent, + cfile_css = css_tryget_online_from_dir(cdentry->d_parent, &memory_cgrp_subsys); ret = -EINVAL; if (IS_ERR(cfile_css)) diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c index 1b9837419bf9c..8be26c7ddb47f 100644 --- a/mm/mmu_gather.c +++ b/mm/mmu_gather.c @@ -139,7 +139,7 @@ static void tlb_remove_table_smp_sync(void *arg) /* Simply deliver the interrupt */ } -static void tlb_remove_table_sync_one(void) +void tlb_remove_table_sync_one(void) { /* * This isn't an RCU grace period and hence the page-tables cannot be @@ -163,8 +163,6 @@ static void tlb_remove_table_free(struct mmu_table_batch *batch) #else /* !CONFIG_MMU_GATHER_RCU_TABLE_FREE */ -static void tlb_remove_table_sync_one(void) { } - static void tlb_remove_table_free(struct mmu_table_batch *batch) { __tlb_remove_table_free(batch); diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index e1c2c9242ce22..f359cfdc1858f 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -122,7 +122,7 @@ struct p9_conn { struct list_head unsent_req_list; struct p9_req_t *rreq; struct p9_req_t *wreq; - char tmp_buf[7]; + char tmp_buf[P9_HDRSZ]; struct p9_fcall rc; int wpos; int wsize; @@ -295,7 +295,7 @@ static void p9_read_work(struct work_struct *work) if (!m->rc.sdata) { m->rc.sdata = m->tmp_buf; m->rc.offset = 0; - m->rc.capacity = 7; /* start by reading header */ + m->rc.capacity = P9_HDRSZ; /* start by reading header */ } clear_bit(Rpending, &m->wsched); @@ -318,7 +318,7 @@ static void p9_read_work(struct work_struct *work) p9_debug(P9_DEBUG_TRANS, "got new header\n"); /* Header size */ - m->rc.size = 7; + m->rc.size = P9_HDRSZ; err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0); if (err) { p9_debug(P9_DEBUG_ERROR, diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index 427f6caefa29f..4255f2a3bea48 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -231,6 +231,14 @@ static void p9_xen_response(struct work_struct *work) continue; } + if (h.size > req->rc.capacity) { + dev_warn(&priv->dev->dev, + "requested packet size too big: %d for tag %d with capacity %zd\n", + h.size, h.tag, req->rc.capacity); + req->status = REQ_STATUS_ERROR; + goto recv_error; + } + memcpy(&req->rc, &h, sizeof(h)); req->rc.offset = 0; @@ -240,6 +248,7 @@ static void p9_xen_response(struct work_struct *work) masked_prod, &masked_cons, XEN_9PFS_RING_SIZE(ring)); +recv_error: virt_mb(); cons += h.size; ring->intf->in_cons = cons; diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index fd164a248569c..580b0940f067a 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -971,6 +971,7 @@ static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type, hci_dev_lock(hdev); hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type); hci_dev_unlock(hdev); + hci_dev_put(hdev); if (!hcon) return -ENOENT; diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c index 1661979b6a6e8..ce744b14d1a98 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -736,7 +736,7 @@ static int __init bt_init(void) err = bt_sysfs_init(); if (err < 0) - return err; + goto cleanup_led; err = sock_register(&bt_sock_family_ops); if (err) @@ -772,6 +772,8 @@ unregister_socket: sock_unregister(PF_BLUETOOTH); cleanup_sysfs: bt_sysfs_cleanup(); +cleanup_led: + bt_leds_cleanup(); return err; } diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 396696241d17f..bb84ff5fb98a2 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3985,7 +3985,8 @@ int hci_register_dev(struct hci_dev *hdev) hci_sock_dev_event(hdev, HCI_DEV_REG); hci_dev_hold(hdev); - if (!test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks)) { + if (!hdev->suspend_notifier.notifier_call && + !test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks)) { hdev->suspend_notifier.notifier_call = hci_suspend_notifier; error = register_pm_notifier(&hdev->suspend_notifier); if (error) diff --git a/net/can/af_can.c b/net/can/af_can.c index 4ddefa6a3e055..20d2dcb7c97ae 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -680,7 +680,7 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev, { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; - if (unlikely(dev->type != ARPHRD_CAN || skb->len != CAN_MTU)) { + if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || skb->len != CAN_MTU)) { pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n", dev->type, skb->len); goto free_skb; @@ -706,7 +706,7 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev, { struct canfd_frame *cfd = (struct canfd_frame *)skb->data; - if (unlikely(dev->type != ARPHRD_CAN || skb->len != CANFD_MTU)) { + if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || skb->len != CANFD_MTU)) { pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n", dev->type, skb->len); goto free_skb; diff --git a/net/dsa/tag_hellcreek.c b/net/dsa/tag_hellcreek.c index 846588c0070a5..53a206d116850 100644 --- a/net/dsa/tag_hellcreek.c +++ b/net/dsa/tag_hellcreek.c @@ -49,7 +49,8 @@ static struct sk_buff *hellcreek_rcv(struct sk_buff *skb, return NULL; } - pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN); + if (pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN)) + return NULL; dsa_default_offload_fwd_mark(skb); diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index fa1d60d13ad90..6795dd0174996 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -22,7 +22,8 @@ static struct sk_buff *ksz_common_rcv(struct sk_buff *skb, if (!skb->dev) return NULL; - pskb_trim_rcsum(skb, skb->len - len); + if (pskb_trim_rcsum(skb, skb->len - len)) + return NULL; dsa_default_offload_fwd_mark(skb); diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c index 2edede9ddac93..d43feadd5fa6b 100644 --- a/net/dsa/tag_sja1105.c +++ b/net/dsa/tag_sja1105.c @@ -644,7 +644,8 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb, * padding and trailer we need to account for the fact that * skb->data points to skb_mac_header(skb) + ETH_HLEN. */ - pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN); + if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN)) + return NULL; /* Trap-to-host frame, no timestamp trailer */ } else { *source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header); diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 1452bb72b7d9c..75c88d4863276 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -830,6 +830,9 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, return -EINVAL; } + if (!cfg->fc_table) + cfg->fc_table = RT_TABLE_MAIN; + return 0; errout: return err; diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index af64ae689b13d..250af6e5a8922 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -421,6 +421,7 @@ static struct fib_info *fib_find_info(struct fib_info *nfi) nfi->fib_prefsrc == fi->fib_prefsrc && nfi->fib_priority == fi->fib_priority && nfi->fib_type == fi->fib_type && + nfi->fib_tb_id == fi->fib_tb_id && memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(u32) * RTAX_MAX) == 0 && !((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_COMPARE_MASK) && diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index fc74a3e3b3e12..454c4357a2979 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1498,24 +1498,6 @@ static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) struct ip_tunnel_parm *p = &t->parms; __be16 o_flags = p->o_flags; - if (t->erspan_ver <= 2) { - if (t->erspan_ver != 0 && !t->collect_md) - o_flags |= TUNNEL_KEY; - - if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) - goto nla_put_failure; - - if (t->erspan_ver == 1) { - if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) - goto nla_put_failure; - } else if (t->erspan_ver == 2) { - if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) - goto nla_put_failure; - if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) - goto nla_put_failure; - } - } - if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || nla_put_be16(skb, IFLA_GRE_IFLAGS, gre_tnl_flags_to_gre_flags(p->i_flags)) || @@ -1556,6 +1538,34 @@ nla_put_failure: return -EMSGSIZE; } +static int erspan_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct ip_tunnel *t = netdev_priv(dev); + + if (t->erspan_ver <= 2) { + if (t->erspan_ver != 0 && !t->collect_md) + t->parms.o_flags |= TUNNEL_KEY; + + if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) + goto nla_put_failure; + + if (t->erspan_ver == 1) { + if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) + goto nla_put_failure; + } else if (t->erspan_ver == 2) { + if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) + goto nla_put_failure; + if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) + goto nla_put_failure; + } + } + + return ipgre_fill_info(skb, dev); + +nla_put_failure: + return -EMSGSIZE; +} + static void erspan_setup(struct net_device *dev) { struct ip_tunnel *t = netdev_priv(dev); @@ -1634,7 +1644,7 @@ static struct rtnl_link_ops erspan_link_ops __read_mostly = { .changelink = erspan_changelink, .dellink = ip_tunnel_dellink, .get_size = ipgre_get_size, - .fill_info = ipgre_fill_info, + .fill_info = erspan_fill_info, .get_link_net = ip_tunnel_get_link_net, }; diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 7951ade74d142..675a80dd78ba6 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -897,6 +897,9 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, if (err < 0) goto fail; + /* We prevent @rt from being freed. */ + rcu_read_lock(); + for (;;) { /* Prepare header of the next frame, * before previous one went down. */ @@ -920,6 +923,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, if (err == 0) { IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), IPSTATS_MIB_FRAGOKS); + rcu_read_unlock(); return 0; } @@ -927,6 +931,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), IPSTATS_MIB_FRAGFAILS); + rcu_read_unlock(); return err; slow_path_clean: diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c index 323d3d2d986f8..3e510664fc891 100644 --- a/net/mac802154/iface.c +++ b/net/mac802154/iface.c @@ -661,6 +661,7 @@ ieee802154_if_add(struct ieee802154_local *local, const char *name, sdata->dev = ndev; sdata->wpan_dev.wpan_phy = local->hw.phy; sdata->local = local; + INIT_LIST_HEAD(&sdata->wpan_dev.list); /* setup type-dependent data */ ret = ieee802154_setup_sdata(sdata, type); diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 1727a4c4764f0..2cc6092b4f865 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -322,8 +322,13 @@ nla_put_failure: } #ifdef CONFIG_NF_CONNTRACK_MARK -static int ctnetlink_dump_mark(struct sk_buff *skb, u32 mark) +static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) { + u32 mark = READ_ONCE(ct->mark); + + if (!mark) + return 0; + if (nla_put_be32(skb, CTA_MARK, htonl(mark))) goto nla_put_failure; return 0; @@ -537,7 +542,7 @@ static int ctnetlink_dump_extinfo(struct sk_buff *skb, static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct) { if (ctnetlink_dump_status(skb, ct) < 0 || - ctnetlink_dump_mark(skb, READ_ONCE(ct->mark)) < 0 || + ctnetlink_dump_mark(skb, ct) < 0 || ctnetlink_dump_secctx(skb, ct) < 0 || ctnetlink_dump_id(skb, ct) < 0 || ctnetlink_dump_use(skb, ct) < 0 || @@ -716,7 +721,6 @@ ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item) struct sk_buff *skb; unsigned int type; unsigned int flags = 0, group; - u32 mark; int err; if (events & (1 << IPCT_DESTROY)) { @@ -821,9 +825,8 @@ ctnetlink_conntrack_event(unsigned int events, const struct nf_ct_event *item) } #ifdef CONFIG_NF_CONNTRACK_MARK - mark = READ_ONCE(ct->mark); - if ((events & (1 << IPCT_MARK) || mark) && - ctnetlink_dump_mark(skb, mark) < 0) + if (events & (1 << IPCT_MARK) && + ctnetlink_dump_mark(skb, ct) < 0) goto nla_put_failure; #endif nlmsg_end(skb, nlh); @@ -2692,7 +2695,6 @@ static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct) { const struct nf_conntrack_zone *zone; struct nlattr *nest_parms; - u32 mark; zone = nf_ct_zone(ct); @@ -2754,8 +2756,7 @@ static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct) goto nla_put_failure; #ifdef CONFIG_NF_CONNTRACK_MARK - mark = READ_ONCE(ct->mark); - if (mark && ctnetlink_dump_mark(skb, mark) < 0) + if (ctnetlink_dump_mark(skb, ct) < 0) goto nla_put_failure; #endif if (ctnetlink_dump_labels(skb, ct) < 0) diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c index 4f9299b9dcddc..06d46d1826347 100644 --- a/net/netfilter/nft_set_pipapo.c +++ b/net/netfilter/nft_set_pipapo.c @@ -1162,6 +1162,7 @@ static int nft_pipapo_insert(const struct net *net, const struct nft_set *set, struct nft_pipapo_match *m = priv->clone; u8 genmask = nft_genmask_next(net); struct nft_pipapo_field *f; + const u8 *start_p, *end_p; int i, bsize_max, err = 0; if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END)) @@ -1202,9 +1203,9 @@ static int nft_pipapo_insert(const struct net *net, const struct nft_set *set, } /* Validate */ + start_p = start; + end_p = end; nft_pipapo_for_each_field(f, i, m) { - const u8 *start_p = start, *end_p = end; - if (f->rules >= (unsigned long)NFT_PIPAPO_RULE0_MAX) return -ENOSPC; diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c index c5eacaac41aea..8f48b10619448 100644 --- a/net/nfc/nci/ntf.c +++ b/net/nfc/nci/ntf.c @@ -240,6 +240,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, target->sens_res = nfca_poll->sens_res; target->sel_res = nfca_poll->sel_res; target->nfcid1_len = nfca_poll->nfcid1_len; + if (target->nfcid1_len > ARRAY_SIZE(target->nfcid1)) + return -EPROTO; if (target->nfcid1_len > 0) { memcpy(target->nfcid1, nfca_poll->nfcid1, target->nfcid1_len); @@ -248,6 +250,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params; target->sensb_res_len = nfcb_poll->sensb_res_len; + if (target->sensb_res_len > ARRAY_SIZE(target->sensb_res)) + return -EPROTO; if (target->sensb_res_len > 0) { memcpy(target->sensb_res, nfcb_poll->sensb_res, target->sensb_res_len); @@ -256,6 +260,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params; target->sensf_res_len = nfcf_poll->sensf_res_len; + if (target->sensf_res_len > ARRAY_SIZE(target->sensf_res)) + return -EPROTO; if (target->sensf_res_len > 0) { memcpy(target->sensf_res, nfcf_poll->sensf_res, target->sensf_res_len); diff --git a/net/tipc/link.c b/net/tipc/link.c index 115a4a7950f50..8fdd3b23bd123 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -2223,7 +2223,9 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, if (tipc_own_addr(l->net) > msg_prevnode(hdr)) l->net_plane = msg_net_plane(hdr); - skb_linearize(skb); + if (skb_linearize(skb)) + goto exit; + hdr = buf_msg(skb); data = msg_data(hdr); diff --git a/net/tipc/node.c b/net/tipc/node.c index b48d97cbbe29c..49ddc484c4fe7 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -1689,6 +1689,7 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list, struct tipc_node *n; struct sk_buff_head xmitq; bool node_up = false; + struct net *peer_net; int bearer_id; int rc; @@ -1705,18 +1706,23 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list, return -EHOSTUNREACH; } + rcu_read_lock(); tipc_node_read_lock(n); node_up = node_is_up(n); - if (node_up && n->peer_net && check_net(n->peer_net)) { + peer_net = n->peer_net; + tipc_node_read_unlock(n); + if (node_up && peer_net && check_net(peer_net)) { /* xmit inner linux container */ - tipc_lxc_xmit(n->peer_net, list); + tipc_lxc_xmit(peer_net, list); if (likely(skb_queue_empty(list))) { - tipc_node_read_unlock(n); + rcu_read_unlock(); tipc_node_put(n); return 0; } } + rcu_read_unlock(); + tipc_node_read_lock(n); bearer_id = n->active_links[selector & 1]; if (unlikely(bearer_id == INVALID_BEARER_ID)) { tipc_node_read_unlock(n); diff --git a/net/unix/diag.c b/net/unix/diag.c index 7e7d7f45685af..e534e327a6a5a 100644 --- a/net/unix/diag.c +++ b/net/unix/diag.c @@ -113,14 +113,16 @@ static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb) return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql); } -static int sk_diag_dump_uid(struct sock *sk, struct sk_buff *nlskb) +static int sk_diag_dump_uid(struct sock *sk, struct sk_buff *nlskb, + struct user_namespace *user_ns) { - uid_t uid = from_kuid_munged(sk_user_ns(nlskb->sk), sock_i_uid(sk)); + uid_t uid = from_kuid_munged(user_ns, sock_i_uid(sk)); return nla_put(nlskb, UNIX_DIAG_UID, sizeof(uid_t), &uid); } static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, - u32 portid, u32 seq, u32 flags, int sk_ino) + struct user_namespace *user_ns, + u32 portid, u32 seq, u32 flags, int sk_ino) { struct nlmsghdr *nlh; struct unix_diag_msg *rep; @@ -166,7 +168,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r goto out_nlmsg_trim; if ((req->udiag_show & UDIAG_SHOW_UID) && - sk_diag_dump_uid(sk, skb)) + sk_diag_dump_uid(sk, skb, user_ns)) goto out_nlmsg_trim; nlmsg_end(skb, nlh); @@ -178,7 +180,8 @@ out_nlmsg_trim: } static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, - u32 portid, u32 seq, u32 flags) + struct user_namespace *user_ns, + u32 portid, u32 seq, u32 flags) { int sk_ino; @@ -189,7 +192,7 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_r if (!sk_ino) return 0; - return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino); + return sk_diag_fill(sk, skb, req, user_ns, portid, seq, flags, sk_ino); } static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) @@ -217,7 +220,7 @@ static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) goto next; if (!(req->udiag_states & (1 << sk->sk_state))) goto next; - if (sk_diag_dump(sk, skb, req, + if (sk_diag_dump(sk, skb, req, sk_user_ns(skb->sk), NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0) @@ -285,7 +288,8 @@ again: if (!rep) goto out; - err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid, + err = sk_diag_fill(sk, rep, req, sk_user_ns(NETLINK_CB(in_skb).sk), + NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, 0, req->udiag_ino); if (err < 0) { nlmsg_free(rep); diff --git a/sound/core/seq/seq_memory.c b/sound/core/seq/seq_memory.c index b7aee23fc3876..47ef6bc30c0ee 100644 --- a/sound/core/seq/seq_memory.c +++ b/sound/core/seq/seq_memory.c @@ -113,15 +113,19 @@ EXPORT_SYMBOL(snd_seq_dump_var_event); * expand the variable length event to linear buffer space. */ -static int seq_copy_in_kernel(char **bufptr, const void *src, int size) +static int seq_copy_in_kernel(void *ptr, void *src, int size) { + char **bufptr = ptr; + memcpy(*bufptr, src, size); *bufptr += size; return 0; } -static int seq_copy_in_user(char __user **bufptr, const void *src, int size) +static int seq_copy_in_user(void *ptr, void *src, int size) { + char __user **bufptr = ptr; + if (copy_to_user(*bufptr, src, size)) return -EFAULT; *bufptr += size; @@ -151,8 +155,7 @@ int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char return newlen; } err = snd_seq_dump_var_event(event, - in_kernel ? (snd_seq_dump_func_t)seq_copy_in_kernel : - (snd_seq_dump_func_t)seq_copy_in_user, + in_kernel ? seq_copy_in_kernel : seq_copy_in_user, &buf); return err < 0 ? err : newlen; } diff --git a/sound/soc/codecs/rt711-sdca-sdw.c b/sound/soc/codecs/rt711-sdca-sdw.c index a085b2f530aa1..31e77d462ef34 100644 --- a/sound/soc/codecs/rt711-sdca-sdw.c +++ b/sound/soc/codecs/rt711-sdca-sdw.c @@ -230,7 +230,7 @@ static int rt711_sdca_read_prop(struct sdw_slave *slave) } /* set the timeout values */ - prop->clk_stop_timeout = 20; + prop->clk_stop_timeout = 700; /* wake-up event */ prop->wake_capable = 1; diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c index 09a73b8549641..779f7097d336c 100644 --- a/sound/soc/codecs/wm8962.c +++ b/sound/soc/codecs/wm8962.c @@ -2490,6 +2490,14 @@ static void wm8962_configure_bclk(struct snd_soc_component *component) snd_soc_component_update_bits(component, WM8962_CLOCKING2, WM8962_SYSCLK_ENA_MASK, WM8962_SYSCLK_ENA); + /* DSPCLK_DIV field in WM8962_CLOCKING1 register is used to generate + * correct frequency of LRCLK and BCLK. Sometimes the read-only value + * can't be updated timely after enabling SYSCLK. This results in wrong + * calculation values. Delay is introduced here to wait for newest + * value from register. The time of the delay should be at least + * 500~1000us according to test. + */ + usleep_range(500, 1000); dspclk = snd_soc_component_read(component, WM8962_CLOCKING1); if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_ON) diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index f6dc71e8ea879..3b673477f6215 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -1166,6 +1166,8 @@ static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe, return; be_substream = snd_soc_dpcm_get_substream(be, stream); + if (!be_substream) + return; for_each_dpcm_fe(be, stream, dpcm) { if (dpcm->fe == fe) diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh index 91f54112167f1..364c82b797c19 100755 --- a/tools/testing/selftests/net/fcnal-test.sh +++ b/tools/testing/selftests/net/fcnal-test.sh @@ -4072,10 +4072,13 @@ elif [ "$TESTS" = "ipv6" ]; then TESTS="$TESTS_IPV6" fi -which nettest >/dev/null -if [ $? -ne 0 ]; then - echo "'nettest' command not found; skipping tests" - exit $ksft_skip +# nettest can be run from PATH or from same directory as this selftest +if ! which nettest >/dev/null; then + PATH=$PWD:$PATH + if ! which nettest >/dev/null; then + echo "'nettest' command not found; skipping tests" + exit $ksft_skip + fi fi declare -i nfail=0 diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh index 996af1ae3d3dd..7df066bf74b87 100755 --- a/tools/testing/selftests/net/fib_tests.sh +++ b/tools/testing/selftests/net/fib_tests.sh @@ -1622,13 +1622,21 @@ ipv4_del_addr_test() $IP addr add dev dummy1 172.16.104.1/24 $IP addr add dev dummy1 172.16.104.11/24 + $IP addr add dev dummy1 172.16.104.12/24 + $IP addr add dev dummy1 172.16.104.13/24 $IP addr add dev dummy2 172.16.104.1/24 $IP addr add dev dummy2 172.16.104.11/24 + $IP addr add dev dummy2 172.16.104.12/24 $IP route add 172.16.105.0/24 via 172.16.104.2 src 172.16.104.11 + $IP route add 172.16.106.0/24 dev lo src 172.16.104.12 + $IP route add table 0 172.16.107.0/24 via 172.16.104.2 src 172.16.104.13 $IP route add vrf red 172.16.105.0/24 via 172.16.104.2 src 172.16.104.11 + $IP route add vrf red 172.16.106.0/24 dev lo src 172.16.104.12 set +e # removing address from device in vrf should only remove route from vrf table + echo " Regular FIB info" + $IP addr del dev dummy2 172.16.104.11/24 $IP ro ls vrf red | grep -q 172.16.105.0/24 log_test $? 1 "Route removed from VRF when source address deleted" @@ -1646,6 +1654,35 @@ ipv4_del_addr_test() $IP ro ls vrf red | grep -q 172.16.105.0/24 log_test $? 0 "Route in VRF is not removed by address delete" + # removing address from device in vrf should only remove route from vrf + # table even when the associated fib info only differs in table ID + echo " Identical FIB info with different table ID" + + $IP addr del dev dummy2 172.16.104.12/24 + $IP ro ls vrf red | grep -q 172.16.106.0/24 + log_test $? 1 "Route removed from VRF when source address deleted" + + $IP ro ls | grep -q 172.16.106.0/24 + log_test $? 0 "Route in default VRF not removed" + + $IP addr add dev dummy2 172.16.104.12/24 + $IP route add vrf red 172.16.106.0/24 dev lo src 172.16.104.12 + + $IP addr del dev dummy1 172.16.104.12/24 + $IP ro ls | grep -q 172.16.106.0/24 + log_test $? 1 "Route removed in default VRF when source address deleted" + + $IP ro ls vrf red | grep -q 172.16.106.0/24 + log_test $? 0 "Route in VRF is not removed by address delete" + + # removing address from device in default vrf should remove route from + # the default vrf even when route was inserted with a table ID of 0. + echo " Table ID 0" + + $IP addr del dev dummy1 172.16.104.13/24 + $IP ro ls | grep -q 172.16.107.0/24 + log_test $? 1 "Route removed in default VRF when source address deleted" + $IP li del dummy1 $IP li del dummy2 cleanup diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh index 694732e4b3448..da6ab300207c0 100755 --- a/tools/testing/selftests/net/pmtu.sh +++ b/tools/testing/selftests/net/pmtu.sh @@ -671,10 +671,12 @@ setup_xfrm() { } setup_nettest_xfrm() { - which nettest >/dev/null - if [ $? -ne 0 ]; then - echo "'nettest' command not found; skipping tests" - return 1 + if ! which nettest >/dev/null; then + PATH=$PWD:$PATH + if ! which nettest >/dev/null; then + echo "'nettest' command not found; skipping tests" + return 1 + fi fi [ ${1} -eq 6 ] && proto="-6" || proto="" diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh index c9ce3dfa42ee7..c3a905923ef29 100755 --- a/tools/testing/selftests/net/rtnetlink.sh +++ b/tools/testing/selftests/net/rtnetlink.sh @@ -782,7 +782,7 @@ kci_test_ipsec_offload() tmpl proto esp src $srcip dst $dstip spi 9 \ mode transport reqid 42 check_err $? - ip x p add dir out src $dstip/24 dst $srcip/24 \ + ip x p add dir in src $dstip/24 dst $srcip/24 \ tmpl proto esp src $dstip dst $srcip spi 9 \ mode transport reqid 42 check_err $?