* 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_cqring (smp_store_release to
+ * 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.
*
#include <linux/mman.h>
#include <linux/percpu.h>
#include <linux/slab.h>
-#include <linux/kthread.h>
#include <linux/blkdev.h>
#include <linux/bvec.h>
#include <linux/net.h>
#include <linux/fsnotify.h>
#include <linux/fadvise.h>
#include <linux/eventpoll.h>
-#include <linux/fs_struct.h>
#include <linux/splice.h>
#include <linux/task_work.h>
#include <linux/pagemap.h>
#include <linux/io_uring.h>
-#include <linux/blk-cgroup.h>
-#include <linux/audit.h>
+#include <linux/tracehook.h>
#define CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>
#include <uapi/linux/io_uring.h>
-#include "internal.h"
+#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
-/*
- * Shift of 9 is 512 entries, or exactly one page on 64-bit archs
- */
-#define IORING_FILE_TABLE_SHIFT 9
-#define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT)
-#define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1)
-#define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE)
+/* 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;
* Written by the application, shouldn't be modified by the
* kernel.
*/
- u32 cq_flags;
+ u32 cq_flags;
/*
* Number of completion events lost because the queue was full;
* this should be avoided by the application by making sure
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;
- size_t len;
- struct bio_vec *bvec;
+ 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 fixed_file_table {
- struct file **files;
+struct io_file_table {
+ struct io_fixed_file *files;
};
-struct fixed_file_ref_node {
+struct io_rsrc_node {
struct percpu_ref refs;
struct list_head node;
- struct list_head file_list;
- struct fixed_file_data *file_data;
+ struct list_head rsrc_list;
+ struct io_rsrc_data *rsrc_data;
struct llist_node llist;
bool done;
};
-struct fixed_file_data {
- struct fixed_file_table *table;
+typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
+
+struct io_rsrc_data {
struct io_ring_ctx *ctx;
- struct fixed_file_ref_node *node;
- struct percpu_ref refs;
+ u64 **tags;
+ unsigned int nr;
+ rsrc_put_fn *do_put;
+ atomic_t refs;
struct completion done;
- struct list_head ref_list;
- spinlock_t lock;
bool quiesce;
};
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 list_head ctx_new_list;
- struct mutex ctx_lock;
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;
- } ____cacheline_aligned_in_smp;
- struct {
+ struct io_rings *rings;
unsigned int flags;
unsigned int compat: 1;
- unsigned int limit_mem: 1;
- unsigned int cq_overflow_flushed: 1;
unsigned int drain_next: 1;
unsigned int eventfd_async: 1;
unsigned int restricted: 1;
- unsigned int sqo_dead: 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
* array.
*/
u32 *sq_array;
+ struct io_uring_sqe *sq_sqes;
unsigned cached_sq_head;
unsigned sq_entries;
- unsigned sq_mask;
- unsigned sq_thread_idle;
- unsigned cached_sq_dropped;
- unsigned cached_cq_overflow;
- unsigned long sq_check_overflow;
-
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 io_uring_sqe *sq_sqes;
+ struct xarray io_buffers;
+ struct xarray personalities;
+ u32 pers_next;
+ unsigned sq_thread_idle;
} ____cacheline_aligned_in_smp;
- struct io_rings *rings;
-
- /* IO offload */
- struct io_wq *io_wq;
-
- /*
- * For SQPOLL usage - we hold a reference to the parent task, so we
- * have access to the ->files
- */
- struct task_struct *sqo_task;
-
- /* Only used for accounting purposes */
- struct mm_struct *mm_account;
-
-#ifdef CONFIG_BLK_CGROUP
- struct cgroup_subsys_state *sqo_blkcg_css;
-#endif
+ /* 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 wait_queue_entry sqo_wait_entry;
struct list_head sqd_list;
- /*
- * If used, fixed file set. Writers must ensure that ->refs is dead,
- * readers must ensure that ->refs is alive as long as the file* is
- * used. Only updated through io_uring_register(2).
- */
- struct fixed_file_data *file_data;
- unsigned nr_user_files;
-
- /* if used, fixed mapped user buffers */
- unsigned nr_user_bufs;
- struct io_mapped_ubuf *user_bufs;
-
- struct user_struct *user;
-
- const struct cred *creds;
-
-#ifdef CONFIG_AUDIT
- kuid_t loginuid;
- unsigned int sessionid;
-#endif
-
- struct completion ref_comp;
- struct completion sq_thread_comp;
-
- /* if all else fails... */
- struct io_kiocb *fallback_req;
-
-#if defined(CONFIG_UNIX)
- struct socket *ring_sock;
-#endif
-
- struct xarray io_buffers;
-
- struct xarray personalities;
- u32 pers_next;
+ unsigned long check_cq_overflow;
struct {
unsigned cached_cq_tail;
unsigned cq_entries;
- unsigned cq_mask;
+ 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;
- unsigned long cq_check_overflow;
- struct wait_queue_head cq_wait;
- struct fasync_struct *cq_fasync;
- struct eventfd_ctx *cq_ev_fd;
- } ____cacheline_aligned_in_smp;
-
- struct {
- struct mutex uring_lock;
- wait_queue_head_t wait;
} ____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.
struct list_head iopoll_list;
struct hlist_head *cancel_hash;
unsigned cancel_hash_bits;
- bool poll_multi_file;
-
- spinlock_t inflight_lock;
- struct list_head inflight_list;
+ bool poll_multi_queue;
} ____cacheline_aligned_in_smp;
- struct delayed_work file_put_work;
- struct llist_head file_put_llist;
-
- struct work_struct exit_work;
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;
};
/*
*/
struct io_poll_iocb {
struct file *file;
- union {
- struct wait_queue_head *head;
- u64 addr;
- };
+ struct wait_queue_head *head;
__poll_t events;
- bool done;
- bool canceled;
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;
- struct file *put_file;
int fd;
+ u32 file_slot;
};
struct io_timeout_data {
struct hrtimer timer;
struct timespec64 ts;
enum hrtimer_mode mode;
+ u32 flags;
};
struct io_accept {
struct sockaddr __user *addr;
int __user *addr_len;
int flags;
+ u32 file_slot;
unsigned long nofile;
};
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 {
struct io_sr_msg {
struct file *file;
union {
- struct user_msghdr __user *umsg;
- void __user *buf;
+ struct compat_msghdr __user *umsg_compat;
+ struct user_msghdr __user *umsg;
+ void __user *buf;
};
int msg_flags;
int bgid;
struct io_open {
struct file *file;
int dfd;
- bool ignore_nonblock;
+ u32 file_slot;
struct filename *filename;
struct open_how how;
unsigned long nofile;
};
-struct io_files_update {
+struct io_rsrc_update {
struct file *file;
u64 arg;
u32 nr_args;
struct io_splice {
struct file *file_out;
- struct file *file_in;
loff_t off_out;
loff_t off_in;
u64 len;
+ int splice_fd_in;
unsigned int flags;
};
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;
- struct list_head list;
u32 cflags;
};
struct io_async_msghdr {
struct iovec fast_iov[UIO_FASTIOV];
- struct iovec *iov;
+ /* 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 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;
};
REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT,
REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT,
- REQ_F_LINK_HEAD_BIT,
- REQ_F_FAIL_LINK_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_ISREG_BIT,
REQ_F_NEED_CLEANUP_BIT,
REQ_F_POLLED_BIT,
REQ_F_BUFFER_SELECTED_BIT,
- REQ_F_NO_FILE_TABLE_BIT,
- REQ_F_WORK_INITIALIZED_BIT,
- REQ_F_LTIMEOUT_ACTIVE_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,
/* IOSQE_BUFFER_SELECT */
REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT),
- /* head of a link */
- REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT),
/* fail rest of links */
- REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT),
- /* on inflight list */
+ 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),
REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT),
/* has or had linked timeout */
REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT),
- /* regular file */
- REQ_F_ISREG = BIT(REQ_F_ISREG_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),
- /* doesn't need file table for this request */
- REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT),
- /* io_wq_work is initialized */
- REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT),
- /* linked timeout is active, i.e. prepared by link's head */
- REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_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 *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
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_sr_msg sr_msg;
struct io_open open;
struct io_close close;
- struct io_files_update files_update;
+ 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;
};
struct io_ring_ctx *ctx;
unsigned int flags;
- refcount_t refs;
+ atomic_t refs;
struct task_struct *task;
u64 user_data;
- struct list_head link_list;
+ struct io_kiocb *link;
+ struct percpu_ref *fixed_rsrc_refs;
- /*
- * 1. used with ctx->iopoll_list with reads/writes
- * 2. to track reqs with ->files (see io_op_def::file_table)
- */
+ /* used with ctx->iopoll_list with reads/writes */
struct list_head inflight_entry;
-
- struct list_head iopoll_entry;
-
- struct percpu_ref *fixed_file_refs;
- struct callback_head task_work;
+ 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;
-struct io_defer_entry {
- struct list_head list;
- struct io_kiocb *req;
- u32 seq;
+ /* 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;
};
-#define IO_IOPOLL_BATCH 8
-
-struct io_comp_state {
- unsigned int nr;
- struct list_head list;
+struct io_tctx_node {
+ struct list_head ctx_node;
+ struct task_struct *task;
struct io_ring_ctx *ctx;
};
-struct io_submit_state {
- struct blk_plug plug;
-
- /*
- * io_kiocb alloc cache
- */
- void *reqs[IO_IOPOLL_BATCH];
- unsigned int free_reqs;
-
- /*
- * Batch completion logic
- */
- struct io_comp_state comp;
-
- /*
- * File reference cache
- */
- struct file *file;
- unsigned int fd;
- unsigned int has_refs;
- unsigned int ios_left;
+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;
- /* don't fail if file grab fails */
- unsigned needs_file_no_error : 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 pollout : 1;
/* op supports buffer selection */
unsigned buffer_select : 1;
- /* must always have async data allocated */
- unsigned needs_async_data : 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;
- unsigned work_flags;
};
static const struct io_op_def io_op_defs[] = {
.unbound_nonreg_file = 1,
.pollin = 1,
.buffer_select = 1,
- .needs_async_data = 1,
+ .needs_async_setup = 1,
+ .plug = 1,
.async_size = sizeof(struct io_async_rw),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FILES,
},
[IORING_OP_WRITEV] = {
.needs_file = 1,
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
- .needs_async_data = 1,
+ .needs_async_setup = 1,
+ .plug = 1,
.async_size = sizeof(struct io_async_rw),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
},
[IORING_OP_FSYNC] = {
.needs_file = 1,
- .work_flags = IO_WQ_WORK_BLKCG,
},
[IORING_OP_READ_FIXED] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
+ .plug = 1,
.async_size = sizeof(struct io_async_rw),
- .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM |
- IO_WQ_WORK_FILES,
},
[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),
- .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE |
- IO_WQ_WORK_MM | IO_WQ_WORK_FILES,
},
[IORING_OP_POLL_ADD] = {
.needs_file = 1,
[IORING_OP_POLL_REMOVE] = {},
[IORING_OP_SYNC_FILE_RANGE] = {
.needs_file = 1,
- .work_flags = IO_WQ_WORK_BLKCG,
},
[IORING_OP_SENDMSG] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
- .needs_async_data = 1,
+ .needs_async_setup = 1,
.async_size = sizeof(struct io_async_msghdr),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FS,
},
[IORING_OP_RECVMSG] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
.buffer_select = 1,
- .needs_async_data = 1,
+ .needs_async_setup = 1,
.async_size = sizeof(struct io_async_msghdr),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FS,
},
[IORING_OP_TIMEOUT] = {
- .needs_async_data = 1,
.async_size = sizeof(struct io_timeout_data),
- .work_flags = IO_WQ_WORK_MM,
},
- [IORING_OP_TIMEOUT_REMOVE] = {},
+ [IORING_OP_TIMEOUT_REMOVE] = {
+ /* used by timeout updates' prep() */
+ },
[IORING_OP_ACCEPT] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES,
},
[IORING_OP_ASYNC_CANCEL] = {},
[IORING_OP_LINK_TIMEOUT] = {
- .needs_async_data = 1,
.async_size = sizeof(struct io_timeout_data),
- .work_flags = IO_WQ_WORK_MM,
},
[IORING_OP_CONNECT] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
- .needs_async_data = 1,
+ .needs_async_setup = 1,
.async_size = sizeof(struct io_async_connect),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FS,
},
[IORING_OP_FALLOCATE] = {
.needs_file = 1,
- .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE,
- },
- [IORING_OP_OPENAT] = {
- .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FS,
- },
- [IORING_OP_CLOSE] = {
- .needs_file = 1,
- .needs_file_no_error = 1,
- .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG,
- },
- [IORING_OP_FILES_UPDATE] = {
- .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM,
- },
- [IORING_OP_STATX] = {
- .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM |
- IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG,
},
+ [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),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FILES,
},
[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),
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
},
[IORING_OP_FADVISE] = {
.needs_file = 1,
- .work_flags = IO_WQ_WORK_BLKCG,
- },
- [IORING_OP_MADVISE] = {
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
},
+ [IORING_OP_MADVISE] = {},
[IORING_OP_SEND] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollout = 1,
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FS,
},
[IORING_OP_RECV] = {
.needs_file = 1,
.unbound_nonreg_file = 1,
.pollin = 1,
.buffer_select = 1,
- .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
- IO_WQ_WORK_FS,
},
[IORING_OP_OPENAT2] = {
- .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS |
- IO_WQ_WORK_BLKCG,
},
[IORING_OP_EPOLL_CTL] = {
.unbound_nonreg_file = 1,
- .work_flags = IO_WQ_WORK_FILES,
},
[IORING_OP_SPLICE] = {
.needs_file = 1,
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
- .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FILES,
},
[IORING_OP_PROVIDE_BUFFERS] = {},
[IORING_OP_REMOVE_BUFFERS] = {},
.hash_reg_file = 1,
.unbound_nonreg_file = 1,
},
+ [IORING_OP_SHUTDOWN] = {
+ .needs_file = 1,
+ },
+ [IORING_OP_RENAMEAT] = {},
+ [IORING_OP_UNLINKAT] = {},
};
-enum io_mem_account {
- ACCT_LOCKED,
- ACCT_PINNED,
-};
+/* 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 void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node);
-static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
- struct io_ring_ctx *ctx);
+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_complete_rw(struct io_kiocb *req, long res, long res2,
- struct io_comp_state *cs);
-static void io_cqring_fill_event(struct io_kiocb *req, long res);
static void io_put_req(struct io_kiocb *req);
-static void io_put_req_deferred(struct io_kiocb *req, int nr);
-static void io_double_put_req(struct io_kiocb *req);
-static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req);
-static void __io_queue_linked_timeout(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_sqe_files_update(struct io_ring_ctx *ctx,
- struct io_uring_files_update *ip,
- unsigned nr_args);
-static void __io_clean_op(struct io_kiocb *req);
-static struct file *io_file_get(struct io_submit_state *state,
+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, struct io_comp_state *cs);
-static void io_file_put_work(struct work_struct *work);
+static void __io_queue_sqe(struct io_kiocb *req);
+static void io_rsrc_put_work(struct work_struct *work);
-static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
- struct iovec **iovec, struct iov_iter *iter,
- bool needs_lock);
-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);
-static void io_req_drop_files(struct io_kiocb *req);
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;
}
EXPORT_SYMBOL(io_uring_get_socket);
-static inline void io_clean_op(struct io_kiocb *req)
+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)
{
- if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED))
- __io_clean_op(req);
+ WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
+ return atomic_inc_not_zero(&req->refs);
}
-static inline bool __io_match_files(struct io_kiocb *req,
- struct files_struct *files)
+static inline bool req_ref_put_and_test(struct io_kiocb *req)
{
- if (req->file && req->file->f_op == &io_uring_fops)
+ if (likely(!(req->flags & REQ_F_REFCOUNT)))
return true;
- return ((req->flags & REQ_F_WORK_INITIALIZED) &&
- (req->work.flags & IO_WQ_WORK_FILES)) &&
- req->work.identity->files == files;
+ 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)
percpu_ref_put(ref);
}
-static bool io_match_task(struct io_kiocb *head,
- struct task_struct *task,
- struct files_struct *files)
+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 *link;
+ struct io_kiocb *req;
- if (task && head->task != task) {
- /* in terms of cancelation, always match if req task is dead */
- if (head->task->flags & PF_EXITING)
- return true;
+ if (task && head->task != task)
return false;
- }
- if (!files)
- return true;
- if (__io_match_files(head, files))
+ if (cancel_all)
return true;
- if (head->flags & REQ_F_LINK_HEAD) {
- list_for_each_entry(link, &head->link_list, link_list) {
- if (__io_match_files(link, files))
- return true;
- }
+
+ io_for_each_link(req, head) {
+ if (req->flags & REQ_F_INFLIGHT)
+ return true;
}
return false;
}
-
-static void io_sq_thread_drop_mm(void)
+static bool io_match_linked(struct io_kiocb *head)
{
- struct mm_struct *mm = current->mm;
+ struct io_kiocb *req;
- if (mm) {
- kthread_unuse_mm(mm);
- mmput(mm);
- current->mm = NULL;
+ io_for_each_link(req, head) {
+ if (req->flags & REQ_F_INFLIGHT)
+ return true;
}
+ return false;
}
-static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx)
+/*
+ * 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)
{
- struct mm_struct *mm;
-
- if (current->flags & PF_EXITING)
- return -EFAULT;
- if (current->mm)
- return 0;
+ bool matched;
- /* Should never happen */
- if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL)))
- return -EFAULT;
+ if (task && head->task != task)
+ return false;
+ if (cancel_all)
+ return true;
- task_lock(ctx->sqo_task);
- mm = ctx->sqo_task->mm;
- if (unlikely(!mm || !mmget_not_zero(mm)))
- mm = NULL;
- task_unlock(ctx->sqo_task);
+ if (head->flags & REQ_F_LINK_TIMEOUT) {
+ struct io_ring_ctx *ctx = head->ctx;
- if (mm) {
- kthread_use_mm(mm);
- return 0;
+ /* 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;
+}
- return -EFAULT;
-}
-
-static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx,
- struct io_kiocb *req)
-{
- if (!(io_op_defs[req->opcode].work_flags & IO_WQ_WORK_MM))
- return 0;
- return __io_sq_thread_acquire_mm(ctx);
-}
-
-static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx,
- struct cgroup_subsys_state **cur_css)
-
+static inline void req_set_fail(struct io_kiocb *req)
{
-#ifdef CONFIG_BLK_CGROUP
- /* puts the old one when swapping */
- if (*cur_css != ctx->sqo_blkcg_css) {
- kthread_associate_blkcg(ctx->sqo_blkcg_css);
- *cur_css = ctx->sqo_blkcg_css;
- }
-#endif
-}
-
-static void io_sq_thread_unassociate_blkcg(void)
-{
-#ifdef CONFIG_BLK_CGROUP
- kthread_associate_blkcg(NULL);
-#endif
+ req->flags |= REQ_F_FAIL;
}
-static inline void req_set_fail_links(struct io_kiocb *req)
+static inline void req_fail_link_node(struct io_kiocb *req, int res)
{
- if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK)
- req->flags |= REQ_F_FAIL_LINK;
+ req_set_fail(req);
+ req->result = res;
}
-/*
- * None of these are dereferenced, they are simply used to check if any of
- * them have changed. If we're under current and check they are still the
- * same, we're fine to grab references to them for actual out-of-line use.
- */
-static void io_init_identity(struct io_identity *id)
+static void io_ring_ctx_ref_free(struct percpu_ref *ref)
{
- id->files = current->files;
- id->mm = current->mm;
-#ifdef CONFIG_BLK_CGROUP
- rcu_read_lock();
- id->blkcg_css = blkcg_css();
- rcu_read_unlock();
-#endif
- id->creds = current_cred();
- id->nsproxy = current->nsproxy;
- id->fs = current->fs;
- id->fsize = rlimit(RLIMIT_FSIZE);
-#ifdef CONFIG_AUDIT
- id->loginuid = current->loginuid;
- id->sessionid = current->sessionid;
-#endif
- refcount_set(&id->count, 1);
-}
+ struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
-static inline void __io_req_init_async(struct io_kiocb *req)
-{
- memset(&req->work, 0, sizeof(req->work));
- req->flags |= REQ_F_WORK_INITIALIZED;
+ complete(&ctx->ref_comp);
}
-/*
- * Note: must call io_req_init_async() for the first time you
- * touch any members of io_wq_work.
- */
-static inline void io_req_init_async(struct io_kiocb *req)
+static inline bool io_is_timeout_noseq(struct io_kiocb *req)
{
- struct io_uring_task *tctx = req->task->io_uring;
-
- if (req->flags & REQ_F_WORK_INITIALIZED)
- return;
-
- __io_req_init_async(req);
-
- /* Grab a ref if this isn't our static identity */
- req->work.identity = tctx->identity;
- if (tctx->identity != &tctx->__identity)
- refcount_inc(&req->work.identity->count);
+ return !req->timeout.off;
}
-static inline bool io_async_submit(struct io_ring_ctx *ctx)
+static void io_fallback_req_func(struct work_struct *work)
{
- return ctx->flags & IORING_SETUP_SQPOLL;
-}
+ 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;
-static void io_ring_ctx_ref_free(struct percpu_ref *ref)
-{
- struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
+ 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);
- complete(&ctx->ref_comp);
-}
+ if (locked) {
+ if (ctx->submit_state.compl_nr)
+ io_submit_flush_completions(ctx);
+ mutex_unlock(&ctx->uring_lock);
+ }
+ percpu_ref_put(&ctx->refs);
-static inline bool io_is_timeout_noseq(struct io_kiocb *req)
-{
- return !req->timeout.off;
}
static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
if (!ctx)
return NULL;
- ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL);
- if (!ctx->fallback_req)
- goto err;
-
/*
* 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.
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->cq_wait);
+ init_waitqueue_head(&ctx->poll_wait);
INIT_LIST_HEAD(&ctx->cq_overflow_list);
init_completion(&ctx->ref_comp);
- init_completion(&ctx->sq_thread_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->wait);
+ 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);
- spin_lock_init(&ctx->inflight_lock);
- INIT_LIST_HEAD(&ctx->inflight_list);
- INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work);
- init_llist_head(&ctx->file_put_llist);
+ 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:
- if (ctx->fallback_req)
- kmem_cache_free(req_cachep, ctx->fallback_req);
+ 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 != ctx->cached_cq_tail
- + READ_ONCE(ctx->cached_cq_overflow);
+ return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail;
}
return false;
}
-static void __io_commit_cqring(struct io_ring_ctx *ctx)
-{
- struct io_rings *rings = ctx->rings;
-
- /* order cqe stores with ring update */
- smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
-}
+#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 void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req)
+static inline bool io_req_ffs_set(struct io_kiocb *req)
{
- if (req->work.identity == &tctx->__identity)
- return;
- if (refcount_dec_and_test(&req->work.identity->count))
- kfree(req->work.identity);
+ return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE);
}
-static void io_req_clean_work(struct io_kiocb *req)
+static void io_req_track_inflight(struct io_kiocb *req)
{
- if (!(req->flags & REQ_F_WORK_INITIALIZED))
- return;
-
- req->flags &= ~REQ_F_WORK_INITIALIZED;
-
- if (req->work.flags & IO_WQ_WORK_MM) {
- mmdrop(req->work.identity->mm);
- req->work.flags &= ~IO_WQ_WORK_MM;
- }
-#ifdef CONFIG_BLK_CGROUP
- if (req->work.flags & IO_WQ_WORK_BLKCG) {
- css_put(req->work.identity->blkcg_css);
- req->work.flags &= ~IO_WQ_WORK_BLKCG;
- }
-#endif
- if (req->work.flags & IO_WQ_WORK_CREDS) {
- put_cred(req->work.identity->creds);
- req->work.flags &= ~IO_WQ_WORK_CREDS;
- }
- if (req->work.flags & IO_WQ_WORK_FS) {
- struct fs_struct *fs = req->work.identity->fs;
-
- spin_lock(&req->work.identity->fs->lock);
- if (--fs->users)
- fs = NULL;
- spin_unlock(&req->work.identity->fs->lock);
- if (fs)
- free_fs_struct(fs);
- req->work.flags &= ~IO_WQ_WORK_FS;
+ if (!(req->flags & REQ_F_INFLIGHT)) {
+ req->flags |= REQ_F_INFLIGHT;
+ atomic_inc(&req->task->io_uring->inflight_tracked);
}
- if (req->flags & REQ_F_INFLIGHT)
- io_req_drop_files(req);
-
- io_put_identity(req->task->io_uring, req);
}
-/*
- * Create a private copy of io_identity, since some fields don't match
- * the current context.
- */
-static bool io_identity_cow(struct io_kiocb *req)
+static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req)
{
- struct io_uring_task *tctx = req->task->io_uring;
- const struct cred *creds = NULL;
- struct io_identity *id;
-
- if (req->work.flags & IO_WQ_WORK_CREDS)
- creds = req->work.identity->creds;
-
- id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL);
- if (unlikely(!id)) {
- req->work.flags |= IO_WQ_WORK_CANCEL;
- return false;
- }
-
- /*
- * We can safely just re-init the creds we copied Either the field
- * matches the current one, or we haven't grabbed it yet. The only
- * exception is ->creds, through registered personalities, so handle
- * that one separately.
- */
- io_init_identity(id);
- if (creds)
- id->creds = creds;
-
- /* add one for this request */
- refcount_inc(&id->count);
+ if (WARN_ON_ONCE(!req->link))
+ return NULL;
- /* drop tctx and req identity references, if needed */
- if (tctx->identity != &tctx->__identity &&
- refcount_dec_and_test(&tctx->identity->count))
- kfree(tctx->identity);
- if (req->work.identity != &tctx->__identity &&
- refcount_dec_and_test(&req->work.identity->count))
- kfree(req->work.identity);
+ req->flags &= ~REQ_F_ARM_LTIMEOUT;
+ req->flags |= REQ_F_LINK_TIMEOUT;
- req->work.identity = id;
- tctx->identity = id;
- return true;
+ /* 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 bool io_grab_identity(struct io_kiocb *req)
+static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
{
- const struct io_op_def *def = &io_op_defs[req->opcode];
- struct io_identity *id = req->work.identity;
- struct io_ring_ctx *ctx = req->ctx;
-
- if (def->work_flags & IO_WQ_WORK_FSIZE) {
- if (id->fsize != rlimit(RLIMIT_FSIZE))
- return false;
- req->work.flags |= IO_WQ_WORK_FSIZE;
- }
-#ifdef CONFIG_BLK_CGROUP
- if (!(req->work.flags & IO_WQ_WORK_BLKCG) &&
- (def->work_flags & IO_WQ_WORK_BLKCG)) {
- rcu_read_lock();
- if (id->blkcg_css != blkcg_css()) {
- rcu_read_unlock();
- return false;
- }
- /*
- * This should be rare, either the cgroup is dying or the task
- * is moving cgroups. Just punt to root for the handful of ios.
- */
- if (css_tryget_online(id->blkcg_css))
- req->work.flags |= IO_WQ_WORK_BLKCG;
- rcu_read_unlock();
- }
-#endif
- if (!(req->work.flags & IO_WQ_WORK_CREDS)) {
- if (id->creds != current_cred())
- return false;
- get_cred(id->creds);
- req->work.flags |= IO_WQ_WORK_CREDS;
- }
-#ifdef CONFIG_AUDIT
- if (!uid_eq(current->loginuid, id->loginuid) ||
- current->sessionid != id->sessionid)
- return false;
-#endif
- if (!(req->work.flags & IO_WQ_WORK_FS) &&
- (def->work_flags & IO_WQ_WORK_FS)) {
- if (current->fs != id->fs)
- return false;
- spin_lock(&id->fs->lock);
- if (!id->fs->in_exec) {
- id->fs->users++;
- req->work.flags |= IO_WQ_WORK_FS;
- } else {
- req->work.flags |= IO_WQ_WORK_CANCEL;
- }
- spin_unlock(¤t->fs->lock);
- }
- if (!(req->work.flags & IO_WQ_WORK_FILES) &&
- (def->work_flags & IO_WQ_WORK_FILES) &&
- !(req->flags & REQ_F_NO_FILE_TABLE)) {
- if (id->files != current->files ||
- id->nsproxy != current->nsproxy)
- return false;
- atomic_inc(&id->files->count);
- get_nsproxy(id->nsproxy);
-
- if (!(req->flags & REQ_F_INFLIGHT)) {
- req->flags |= REQ_F_INFLIGHT;
-
- spin_lock_irq(&ctx->inflight_lock);
- list_add(&req->inflight_entry, &ctx->inflight_list);
- spin_unlock_irq(&ctx->inflight_lock);
- }
- req->work.flags |= IO_WQ_WORK_FILES;
- }
- if (!(req->work.flags & IO_WQ_WORK_MM) &&
- (def->work_flags & IO_WQ_WORK_MM)) {
- if (id->mm != current->mm)
- return false;
- mmgrab(id->mm);
- req->work.flags |= IO_WQ_WORK_MM;
- }
-
- return true;
+ 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;
- struct io_identity *id;
- io_req_init_async(req);
- id = req->work.identity;
+ 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 (def->unbound_nonreg_file)
req->work.flags |= IO_WQ_WORK_UNBOUND;
}
-
- /* if we fail grabbing identity, we must COW, regrab, and retry */
- if (io_grab_identity(req))
- return;
-
- if (!io_identity_cow(req))
- return;
-
- /* can't fail at this point */
- if (!io_grab_identity(req))
- WARN_ON(1);
}
static void io_prep_async_link(struct io_kiocb *req)
{
struct io_kiocb *cur;
- io_prep_async_work(req);
- if (req->flags & REQ_F_LINK_HEAD)
- list_for_each_entry(cur, &req->link_list, link_list)
+ 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 struct io_kiocb *__io_queue_async_work(struct io_kiocb *req)
+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;
- trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req,
- &req->work, req->flags);
- io_wq_enqueue(ctx->io_wq, &req->work);
- return link;
-}
+ /* must not take the lock, NULL it as a precaution */
+ locked = NULL;
-static void io_queue_async_work(struct io_kiocb *req)
-{
- struct io_kiocb *link;
+ BUG_ON(!tctx);
+ BUG_ON(!tctx->io_wq);
/* init ->work of the whole link before punting */
io_prep_async_link(req);
- link = __io_queue_async_work(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;
- int ret;
- ret = hrtimer_try_to_cancel(&io->timer);
- if (ret != -1) {
+ if (hrtimer_try_to_cancel(&io->timer) != -1) {
if (status)
- req_set_fail_links(req);
+ req_set_fail(req);
atomic_set(&req->ctx->cq_timeouts,
atomic_read(&req->ctx->cq_timeouts) + 1);
list_del_init(&req->timeout.list);
- io_cqring_fill_event(req, status);
- io_put_req_deferred(req, 1);
- }
-}
-
-/*
- * 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,
- struct files_struct *files)
-{
- struct io_kiocb *req, *tmp;
- int canceled = 0;
-
- spin_lock_irq(&ctx->completion_lock);
- list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
- if (io_match_task(req, tsk, files)) {
- io_kill_timeout(req, -ECANCELED);
- canceled++;
- }
+ io_fill_cqe_req(req, status, 0);
+ io_put_req_deferred(req);
}
- spin_unlock_irq(&ctx->completion_lock);
- return canceled != 0;
}
-static void __io_queue_deferred(struct io_ring_ctx *ctx)
+static void io_queue_deferred(struct io_ring_ctx *ctx)
{
- do {
+ while (!list_empty(&ctx->defer_list)) {
struct io_defer_entry *de = list_first_entry(&ctx->defer_list,
struct io_defer_entry, list);
list_del_init(&de->list);
io_req_task_queue(de->req);
kfree(de);
- } while (!list_empty(&ctx->defer_list));
+ }
}
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;
- u32 seq;
-
- if (list_empty(&ctx->timeout_list))
- return;
-
- seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
+ spin_lock_irq(&ctx->timeout_lock);
list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
u32 events_needed, events_got;
io_kill_timeout(req, 0);
}
-
ctx->cq_last_tm_flush = seq;
+ spin_unlock_irq(&ctx->timeout_lock);
}
-static void io_commit_cqring(struct io_ring_ctx *ctx)
+static void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
{
- io_flush_timeouts(ctx);
- __io_commit_cqring(ctx);
+ if (ctx->off_timeout_used)
+ io_flush_timeouts(ctx);
+ if (ctx->drain_active)
+ io_queue_deferred(ctx);
+}
- if (unlikely(!list_empty(&ctx->defer_list)))
- __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 == r->sq_ring_entries;
+ return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries;
}
-static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx)
+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;
+ unsigned tail, mask = ctx->cq_entries - 1;
- tail = ctx->cached_cq_tail;
/*
* 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 (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries)
+ if (__io_cqring_events(ctx) == ctx->cq_entries)
return NULL;
- ctx->cached_cq_tail++;
- return &rings->cqes[tail & ctx->cq_mask];
+ tail = ctx->cached_cq_tail++;
+ return &rings->cqes[tail & mask];
}
static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx)
{
- if (!ctx->cq_ev_fd)
+ if (likely(!ctx->cq_ev_fd))
return false;
if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
return false;
- if (!ctx->eventfd_async)
- return true;
- return io_wq_current_is_worker();
+ 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)
{
- if (wq_has_sleeper(&ctx->cq_wait)) {
- wake_up_interruptible(&ctx->cq_wait);
- kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
- }
- if (waitqueue_active(&ctx->wait))
- wake_up(&ctx->wait);
+ /*
+ * 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_mark_overflow(struct io_ring_ctx *ctx)
+static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
{
- if (list_empty(&ctx->cq_overflow_list)) {
- clear_bit(0, &ctx->sq_check_overflow);
- clear_bit(0, &ctx->cq_check_overflow);
- ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
+ /* 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,
- struct task_struct *tsk,
- struct files_struct *files)
+static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
{
- struct io_rings *rings = ctx->rings;
- struct io_kiocb *req, *tmp;
- struct io_uring_cqe *cqe;
- unsigned long flags;
- LIST_HEAD(list);
-
- if (!force) {
- if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) ==
- rings->cq_ring_entries))
- return false;
- }
+ bool all_flushed, posted;
- spin_lock_irqsave(&ctx->completion_lock, flags);
+ if (!force && __io_cqring_events(ctx) == ctx->cq_entries)
+ return false;
- cqe = NULL;
- list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) {
- if (!io_match_task(req, tsk, files))
- continue;
+ 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;
- cqe = io_get_cqring(ctx);
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);
- list_move(&req->compl.list, &list);
- if (cqe) {
- WRITE_ONCE(cqe->user_data, req->user_data);
- WRITE_ONCE(cqe->res, req->result);
- WRITE_ONCE(cqe->flags, req->compl.cflags);
- } else {
- ctx->cached_cq_overflow++;
- WRITE_ONCE(ctx->rings->cq_overflow,
- ctx->cached_cq_overflow);
- }
+ posted = true;
+ list_del(&ocqe->list);
+ kfree(ocqe);
}
- io_commit_cqring(ctx);
- io_cqring_mark_overflow(ctx);
-
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
- io_cqring_ev_posted(ctx);
-
- while (!list_empty(&list)) {
- req = list_first_entry(&list, struct io_kiocb, compl.list);
- list_del(&req->compl.list);
- io_put_req(req);
+ 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);
}
- return cqe != NULL;
+ if (posted)
+ io_commit_cqring(ctx);
+ spin_unlock(&ctx->completion_lock);
+ if (posted)
+ io_cqring_ev_posted(ctx);
+ return all_flushed;
}
-static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
- struct task_struct *tsk,
- struct files_struct *files)
+static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx)
{
- if (test_bit(0, &ctx->cq_check_overflow)) {
+ 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);
- __io_cqring_overflow_flush(ctx, force, tsk, files);
+ ret = __io_cqring_overflow_flush(ctx, false);
if (ctx->flags & IORING_SETUP_IOPOLL)
mutex_unlock(&ctx->uring_lock);
}
+
+ return ret;
}
-static void __io_cqring_fill_event(struct io_kiocb *req, long res,
- unsigned int cflags)
+/* must to be called somewhat shortly after putting a request */
+static inline void io_put_task(struct task_struct *task, int nr)
{
- struct io_ring_ctx *ctx = req->ctx;
- struct io_uring_cqe *cqe;
-
- trace_io_uring_complete(ctx, req->user_data, res);
+ struct io_uring_task *tctx = task->io_uring;
- /*
- * 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_cqring(ctx);
- if (likely(cqe)) {
- WRITE_ONCE(cqe->user_data, req->user_data);
- WRITE_ONCE(cqe->res, res);
- WRITE_ONCE(cqe->flags, cflags);
- } else if (ctx->cq_overflow_flushed ||
- atomic_read(&req->task->io_uring->in_idle)) {
- /*
- * If we're in ring overflow flush mode, or in task cancel mode,
- * then we cannot store the request for later flushing, we need
- * to drop it on the floor.
- */
- ctx->cached_cq_overflow++;
- WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow);
+ if (likely(task == current)) {
+ tctx->cached_refs += nr;
} else {
- if (list_empty(&ctx->cq_overflow_list)) {
- set_bit(0, &ctx->sq_check_overflow);
- set_bit(0, &ctx->cq_check_overflow);
- ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW;
- }
- io_clean_op(req);
- req->result = res;
- req->compl.cflags = cflags;
- refcount_inc(&req->refs);
- list_add_tail(&req->compl.list, &ctx->cq_overflow_list);
+ 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_cqring_fill_event(struct io_kiocb *req, long res)
+static void io_task_refs_refill(struct io_uring_task *tctx)
{
- __io_cqring_fill_event(req, res, 0);
+ 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 void io_cqring_add_event(struct io_kiocb *req, long res, long cflags)
+static inline void io_get_task_refs(int nr)
{
- struct io_ring_ctx *ctx = req->ctx;
- unsigned long flags;
-
- spin_lock_irqsave(&ctx->completion_lock, flags);
- __io_cqring_fill_event(req, res, cflags);
- io_commit_cqring(ctx);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
+ struct io_uring_task *tctx = current->io_uring;
- io_cqring_ev_posted(ctx);
+ tctx->cached_refs -= nr;
+ if (unlikely(tctx->cached_refs < 0))
+ io_task_refs_refill(tctx);
}
-static void io_submit_flush_completions(struct io_comp_state *cs)
+static __cold void io_uring_drop_tctx_refs(struct task_struct *task)
{
- struct io_ring_ctx *ctx = cs->ctx;
+ struct io_uring_task *tctx = task->io_uring;
+ unsigned int refs = tctx->cached_refs;
- spin_lock_irq(&ctx->completion_lock);
- while (!list_empty(&cs->list)) {
- struct io_kiocb *req;
+ if (refs) {
+ tctx->cached_refs = 0;
+ percpu_counter_sub(&tctx->inflight, refs);
+ put_task_struct_many(task, refs);
+ }
+}
- req = list_first_entry(&cs->list, struct io_kiocb, compl.list);
- list_del(&req->compl.list);
- __io_cqring_fill_event(req, req->result, req->compl.cflags);
+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) {
/*
- * io_free_req() doesn't care about completion_lock unless one
- * of these flags is set. REQ_F_WORK_INITIALIZED is in the list
- * because of a potential deadlock with req->work.fs->lock
+ * 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.
*/
- if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT
- |REQ_F_WORK_INITIALIZED)) {
- spin_unlock_irq(&ctx->completion_lock);
- io_put_req(req);
- spin_lock_irq(&ctx->completion_lock);
- } else {
- io_put_req(req);
- }
+ io_account_cq_overflow(ctx);
+ return false;
}
- io_commit_cqring(ctx);
- spin_unlock_irq(&ctx->completion_lock);
+ 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);
- io_cqring_ev_posted(ctx);
- cs->nr = 0;
+ }
+ 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 void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags,
- struct io_comp_state *cs)
+static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data,
+ s32 res, u32 cflags)
{
- if (!cs) {
- io_cqring_add_event(req, res, cflags);
- io_put_req(req);
- } else {
- io_clean_op(req);
- req->result = res;
- req->compl.cflags = cflags;
- list_add_tail(&req->compl.list, &cs->list);
- if (++cs->nr >= 32)
- io_submit_flush_completions(cs);
+ 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 void io_req_complete(struct io_kiocb *req, long res)
+static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags)
{
- __io_req_complete(req, res, 0, NULL);
+ __io_fill_cqe(req->ctx, req->user_data, res, cflags);
}
-static inline bool io_is_fallback_req(struct io_kiocb *req)
+static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data,
+ s32 res, u32 cflags)
{
- return req == (struct io_kiocb *)
- ((unsigned long) req->ctx->fallback_req & ~1UL);
+ ctx->cq_extra++;
+ return __io_fill_cqe(ctx, user_data, res, cflags);
}
-static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx)
+static void io_req_complete_post(struct io_kiocb *req, s32 res,
+ u32 cflags)
{
- struct io_kiocb *req;
-
- req = ctx->fallback_req;
- if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req))
- return req;
+ struct io_ring_ctx *ctx = req->ctx;
- return NULL;
-}
+ 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);
-static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx,
- struct io_submit_state *state)
+ if (req) {
+ io_cqring_ev_posted(ctx);
+ percpu_ref_put(&ctx->refs);
+ }
+}
+
+static inline bool io_req_needs_clean(struct io_kiocb *req)
{
- if (!state->free_reqs) {
- gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
- size_t sz;
- int ret;
+ 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;
+}
- sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs));
- ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs);
+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);
+}
- /*
- * 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])
- goto fallback;
- ret = 1;
- }
- state->free_reqs = ret;
+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];
-fallback:
- return io_get_fallback_req(ctx);
}
-static inline void io_put_file(struct io_kiocb *req, struct file *file,
- bool fixed)
+static inline void io_put_file(struct file *file)
{
- if (fixed)
- percpu_ref_put(req->fixed_file_refs);
- else
+ if (file)
fput(file);
}
static void io_dismantle_req(struct io_kiocb *req)
{
- io_clean_op(req);
+ unsigned int flags = req->flags;
- if (req->async_data)
+ 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);
- if (req->file)
- io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
-
- io_req_clean_work(req);
+ req->async_data = NULL;
+ }
}
static void __io_free_req(struct io_kiocb *req)
{
- struct io_uring_task *tctx = req->task->io_uring;
struct io_ring_ctx *ctx = req->ctx;
io_dismantle_req(req);
+ io_put_task(req->task, 1);
- percpu_counter_dec(&tctx->inflight);
- if (atomic_read(&tctx->in_idle))
- wake_up(&tctx->wait);
- put_task_struct(req->task);
+ spin_lock(&ctx->completion_lock);
+ list_add(&req->inflight_entry, &ctx->locked_free_list);
+ ctx->locked_free_nr++;
+ spin_unlock(&ctx->completion_lock);
- if (likely(!io_is_fallback_req(req)))
- kmem_cache_free(req_cachep, req);
- else
- clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req);
percpu_ref_put(&ctx->refs);
}
-static void io_kill_linked_timeout(struct io_kiocb *req)
+static inline void io_remove_next_linked(struct io_kiocb *req)
{
- struct io_ring_ctx *ctx = req->ctx;
- struct io_kiocb *link;
- bool cancelled = false;
- unsigned long flags;
+ struct io_kiocb *nxt = req->link;
- spin_lock_irqsave(&ctx->completion_lock, flags);
- link = list_first_entry_or_null(&req->link_list, struct io_kiocb,
- link_list);
- /*
- * Can happen if a linked timeout fired and link had been like
- * req -> link t-out -> link t-out [-> ...]
- */
- if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) {
- struct io_timeout_data *io = link->async_data;
- int ret;
-
- list_del_init(&link->link_list);
- ret = hrtimer_try_to_cancel(&io->timer);
- if (ret != -1) {
- io_cqring_fill_event(link, -ECANCELED);
- io_commit_cqring(ctx);
- cancelled = true;
- }
- }
- req->flags &= ~REQ_F_LINK_TIMEOUT;
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
- if (cancelled) {
- io_cqring_ev_posted(ctx);
- io_put_req(link);
- }
+ req->link = nxt->link;
+ nxt->link = NULL;
}
-static struct io_kiocb *io_req_link_next(struct io_kiocb *req)
+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 *nxt;
+ struct io_kiocb *link = req->link;
- /*
- * The list should never be empty when we are called here. But could
- * potentially happen if the chain is messed up, check to be on the
- * safe side.
- */
- if (unlikely(list_empty(&req->link_list)))
- return NULL;
+ if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
+ struct io_timeout_data *io = link->async_data;
- nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list);
- list_del_init(&req->link_list);
- if (!list_empty(&nxt->link_list))
- nxt->flags |= REQ_F_LINK_HEAD;
- return nxt;
+ 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;
}
-/*
- * Called if REQ_F_LINK_HEAD is set, and we fail the head request
- */
static void io_fail_links(struct io_kiocb *req)
+ __must_hold(&req->ctx->completion_lock)
{
- struct io_ring_ctx *ctx = req->ctx;
- unsigned long flags;
+ struct io_kiocb *nxt, *link = req->link;
- spin_lock_irqsave(&ctx->completion_lock, flags);
- while (!list_empty(&req->link_list)) {
- struct io_kiocb *link = list_first_entry(&req->link_list,
- struct io_kiocb, link_list);
+ req->link = NULL;
+ while (link) {
+ long res = -ECANCELED;
- list_del_init(&link->link_list);
- trace_io_uring_fail_link(req, link);
+ if (link->flags & REQ_F_FAIL)
+ res = link->result;
- io_cqring_fill_event(link, -ECANCELED);
+ nxt = link->link;
+ link->link = NULL;
- /*
- * It's ok to free under spinlock as they're not linked anymore,
- * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on
- * work.fs->lock.
- */
- if (link->flags & REQ_F_WORK_INITIALIZED)
- io_put_req_deferred(link, 2);
- else
- io_double_put_req(link);
+ trace_io_uring_fail_link(req, link);
+ io_fill_cqe_req(link, res, 0);
+ io_put_req_deferred(link);
+ link = nxt;
}
+}
- io_commit_cqring(ctx);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
+static bool io_disarm_next(struct io_kiocb *req)
+ __must_hold(&req->ctx->completion_lock)
+{
+ bool posted = false;
- io_cqring_ev_posted(ctx);
+ 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)
{
- req->flags &= ~REQ_F_LINK_HEAD;
- if (req->flags & REQ_F_LINK_TIMEOUT)
- io_kill_linked_timeout(req);
+ struct io_kiocb *nxt;
/*
* If LINK is set, we have dependent requests in this chain. If we
* dependencies to the next request. In case of failure, fail the rest
* of the chain.
*/
- if (likely(!(req->flags & REQ_F_FAIL_LINK)))
- return io_req_link_next(req);
- io_fail_links(req);
- return NULL;
+ 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 struct io_kiocb *io_req_find_next(struct io_kiocb *req)
+static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req)
{
- if (likely(!(req->flags & REQ_F_LINK_HEAD)))
+ if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK))))
return NULL;
return __io_req_find_next(req);
}
-static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok)
+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_ring_ctx *ctx = req->ctx;
+ struct io_uring_task *tctx = tsk->io_uring;
enum task_work_notify_mode notify;
- int ret;
+ 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);
- if (tsk->flags & PF_EXITING)
- return -ESRCH;
+ /* task_work already pending, we're done */
+ if (running)
+ return;
/*
* SQPOLL kernel thread doesn't need notification, just a wakeup. For
* processing task_work. There's no reliable way to tell if TWA_RESUME
* will do the job.
*/
- notify = TWA_NONE;
- if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok)
- notify = TWA_SIGNAL;
-
- ret = task_work_add(tsk, &req->task_work, notify);
- if (!ret)
+ 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;
+ }
- return ret;
-}
-
-static void __io_req_task_cancel(struct io_kiocb *req, int error)
-{
- struct io_ring_ctx *ctx = req->ctx;
-
- spin_lock_irq(&ctx->completion_lock);
- io_cqring_fill_event(req, error);
- io_commit_cqring(ctx);
- spin_unlock_irq(&ctx->completion_lock);
+ 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);
- io_cqring_ev_posted(ctx);
- req_set_fail_links(req);
- io_double_put_req(req);
+ 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 callback_head *cb)
+static void io_req_task_cancel(struct io_kiocb *req, bool *locked)
{
- struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
struct io_ring_ctx *ctx = req->ctx;
- mutex_lock(&ctx->uring_lock);
- __io_req_task_cancel(req, -ECANCELED);
- mutex_unlock(&ctx->uring_lock);
- percpu_ref_put(&ctx->refs);
+ /* 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)
+static void io_req_task_submit(struct io_kiocb *req, bool *locked)
{
struct io_ring_ctx *ctx = req->ctx;
- mutex_lock(&ctx->uring_lock);
- if (!ctx->sqo_dead && !__io_sq_thread_acquire_mm(ctx))
- __io_queue_sqe(req, NULL);
+ 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_task_cancel(req, -EFAULT);
- mutex_unlock(&ctx->uring_lock);
-
- if (ctx->flags & IORING_SETUP_SQPOLL)
- io_sq_thread_drop_mm();
+ io_req_complete_failed(req, -EFAULT);
}
-static void io_req_task_submit(struct callback_head *cb)
+static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
{
- struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
- struct io_ring_ctx *ctx = req->ctx;
-
- __io_req_task_submit(req);
- percpu_ref_put(&ctx->refs);
+ 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)
{
- int ret;
-
- init_task_work(&req->task_work, io_req_task_submit);
- percpu_ref_get(&req->ctx->refs);
-
- ret = io_req_task_work_add(req, true);
- if (unlikely(ret)) {
- struct task_struct *tsk;
+ req->io_task_work.func = io_req_task_submit;
+ io_req_task_work_add(req);
+}
- init_task_work(&req->task_work, io_req_task_cancel);
- tsk = io_wq_get_task(req->ctx->io_wq);
- task_work_add(tsk, &req->task_work, TWA_NONE);
- wake_up_process(tsk);
- }
+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 void io_queue_next(struct io_kiocb *req)
+static inline void io_queue_next(struct io_kiocb *req)
{
struct io_kiocb *nxt = io_req_find_next(req);
__io_free_req(req);
}
-struct req_batch {
- void *reqs[IO_IOPOLL_BATCH];
- int to_free;
+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->to_free = 0;
rb->task_refs = 0;
+ rb->ctx_refs = 0;
rb->task = NULL;
}
-static void __io_req_free_batch_flush(struct io_ring_ctx *ctx,
- struct req_batch *rb)
+static void io_req_free_batch_finish(struct io_ring_ctx *ctx,
+ struct req_batch *rb)
{
- kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs);
- percpu_ref_put_many(&ctx->refs, rb->to_free);
- rb->to_free = 0;
+ 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_finish(struct io_ring_ctx *ctx,
- struct req_batch *rb)
+static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req,
+ struct io_submit_state *state)
{
- if (rb->to_free)
- __io_req_free_batch_flush(ctx, rb);
- if (rb->task) {
- struct io_uring_task *tctx = rb->task->io_uring;
+ io_queue_next(req);
+ io_dismantle_req(req);
- percpu_counter_sub(&tctx->inflight, rb->task_refs);
- if (atomic_read(&tctx->in_idle))
- wake_up(&tctx->wait);
- put_task_struct_many(rb->task, rb->task_refs);
- rb->task = NULL;
+ 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_req_free_batch(struct req_batch *rb, struct io_kiocb *req)
+static void io_submit_flush_completions(struct io_ring_ctx *ctx)
+ __must_hold(&ctx->uring_lock)
{
- if (unlikely(io_is_fallback_req(req))) {
- io_free_req(req);
- return;
+ 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);
}
- if (req->flags & REQ_F_LINK_HEAD)
- io_queue_next(req);
+ io_commit_cqring(ctx);
+ spin_unlock(&ctx->completion_lock);
+ io_cqring_ev_posted(ctx);
- if (req->task != rb->task) {
- if (rb->task) {
- struct io_uring_task *tctx = rb->task->io_uring;
+ io_init_req_batch(&rb);
+ for (i = 0; i < nr; i++) {
+ struct io_kiocb *req = state->compl_reqs[i];
- percpu_counter_sub(&tctx->inflight, rb->task_refs);
- if (atomic_read(&tctx->in_idle))
- wake_up(&tctx->wait);
- put_task_struct_many(rb->task, rb->task_refs);
- }
- rb->task = req->task;
- rb->task_refs = 0;
+ if (req_ref_put_and_test(req))
+ io_req_free_batch(&rb, req, &ctx->submit_state);
}
- rb->task_refs++;
- io_dismantle_req(req);
- rb->reqs[rb->to_free++] = req;
- if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs)))
- __io_req_free_batch_flush(req->ctx, rb);
+ 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 struct io_kiocb *io_put_req_find_next(struct io_kiocb *req)
+static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req)
{
struct io_kiocb *nxt = NULL;
- if (refcount_dec_and_test(&req->refs)) {
+ if (req_ref_put_and_test(req)) {
nxt = io_req_find_next(req);
__io_free_req(req);
}
return nxt;
}
-static void io_put_req(struct io_kiocb *req)
+static inline void io_put_req(struct io_kiocb *req)
{
- if (refcount_dec_and_test(&req->refs))
+ if (req_ref_put_and_test(req))
io_free_req(req);
}
-static void io_put_req_deferred_cb(struct callback_head *cb)
-{
- struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-
- io_free_req(req);
-}
-
-static void io_free_req_deferred(struct io_kiocb *req)
+static inline void io_put_req_deferred(struct io_kiocb *req)
{
- int ret;
-
- init_task_work(&req->task_work, io_put_req_deferred_cb);
- ret = io_req_task_work_add(req, true);
- if (unlikely(ret)) {
- struct task_struct *tsk;
-
- tsk = io_wq_get_task(req->ctx->io_wq);
- task_work_add(tsk, &req->task_work, TWA_NONE);
- wake_up_process(tsk);
+ if (req_ref_put_and_test(req)) {
+ req->io_task_work.func = io_free_req_work;
+ io_req_task_work_add(req);
}
}
-static inline void io_put_req_deferred(struct io_kiocb *req, int refs)
-{
- if (refcount_sub_and_test(refs, &req->refs))
- io_free_req_deferred(req);
-}
-
-static struct io_wq_work *io_steal_work(struct io_kiocb *req)
-{
- struct io_kiocb *nxt;
-
- /*
- * A ref is owned by io-wq in which context we're. So, if that's the
- * last one, it's safe to steal next work. False negatives are Ok,
- * it just will be re-punted async in io_put_work()
- */
- if (refcount_read(&req->refs) != 1)
- return NULL;
-
- nxt = io_req_find_next(req);
- return nxt ? &nxt->work : NULL;
-}
-
-static void io_double_put_req(struct io_kiocb *req)
-{
- /* drop both submit and complete references */
- if (refcount_sub_and_test(2, &req->refs))
- io_free_req(req);
-}
-
static unsigned io_cqring_events(struct io_ring_ctx *ctx)
{
- struct io_rings *rings = ctx->rings;
-
/* See comment at the top of this file */
smp_rmb();
- return ctx->cached_cq_tail - READ_ONCE(rings->cq.head);
+ return __io_cqring_events(ctx);
}
static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
{
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)
{
- /*
- * Not safe to run on exiting task, and the task_work handling will
- * not add work to such a task.
- */
- if (unlikely(current->flags & PF_EXITING))
- return false;
- if (current->task_works) {
+ if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) {
__set_current_state(TASK_RUNNING);
- task_work_run();
+ tracehook_notify_signal();
return true;
}
return false;
}
-static void io_iopoll_queue(struct list_head *again)
-{
- struct io_kiocb *req;
-
- do {
- req = list_first_entry(again, struct io_kiocb, iopoll_entry);
- list_del(&req->iopoll_entry);
- __io_complete_rw(req, -EAGAIN, 0, NULL);
- } while (!list_empty(again));
-}
-
/*
* Find and free completed poll iocbs
*/
{
struct req_batch rb;
struct io_kiocb *req;
- LIST_HEAD(again);
/* order with ->result store in io_complete_rw_iopoll() */
smp_rmb();
io_init_req_batch(&rb);
while (!list_empty(done)) {
- int cflags = 0;
-
- req = list_first_entry(done, struct io_kiocb, iopoll_entry);
- if (READ_ONCE(req->result) == -EAGAIN) {
- req->result = 0;
- req->iopoll_completed = 0;
- list_move_tail(&req->iopoll_entry, &again);
- continue;
- }
- list_del(&req->iopoll_entry);
-
- if (req->flags & REQ_F_BUFFER_SELECTED)
- cflags = io_put_rw_kbuf(req);
+ req = list_first_entry(done, struct io_kiocb, inflight_entry);
+ list_del(&req->inflight_entry);
- __io_cqring_fill_event(req, req->result, cflags);
+ io_fill_cqe_req(req, req->result, io_put_rw_kbuf(req));
(*nr_events)++;
- if (refcount_dec_and_test(&req->refs))
- io_req_free_batch(&rb, req);
+ if (req_ref_put_and_test(req))
+ io_req_free_batch(&rb, req, &ctx->submit_state);
}
io_commit_cqring(ctx);
- if (ctx->flags & IORING_SETUP_SQPOLL)
- io_cqring_ev_posted(ctx);
+ io_cqring_ev_posted_iopoll(ctx);
io_req_free_batch_finish(ctx, &rb);
-
- if (!list_empty(&again))
- io_iopoll_queue(&again);
}
static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
struct io_kiocb *req, *tmp;
LIST_HEAD(done);
bool spin;
- int ret;
/*
* 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_file && *nr_events < min;
+ spin = !ctx->poll_multi_queue && *nr_events < min;
- ret = 0;
- list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, iopoll_entry) {
+ 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.
* and complete those lists first, if we have entries there.
*/
if (READ_ONCE(req->iopoll_completed)) {
- list_move_tail(&req->iopoll_entry, &done);
+ list_move_tail(&req->inflight_entry, &done);
continue;
}
if (!list_empty(&done))
break;
ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin);
- if (ret < 0)
- break;
+ 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->iopoll_entry, &done);
-
- if (ret && spin)
- spin = false;
- ret = 0;
+ list_move_tail(&req->inflight_entry, &done);
}
if (!list_empty(&done))
io_iopoll_complete(ctx, nr_events, &done);
- return ret;
-}
-
-/*
- * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a
- * non-spinning poll check - we'll still enter the driver poll loop, but only
- * as a non-spinning completion check.
- */
-static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events,
- long min)
-{
- while (!list_empty(&ctx->iopoll_list) && !need_resched()) {
- int ret;
-
- ret = io_do_iopoll(ctx, nr_events, min);
- if (ret < 0)
- return ret;
- if (*nr_events >= min)
- return 0;
- }
-
- return 1;
+ return 0;
}
/*
static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
{
unsigned int nr_events = 0;
- int iters = 0, ret = 0;
+ int ret = 0;
/*
* We disallow the app entering submit/complete with polling, but we
* 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 {
- /*
- * 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->cq_check_overflow))
- __io_cqring_overflow_flush(ctx, false, NULL, NULL);
- if (io_cqring_events(ctx))
- break;
-
/*
* If a submit got punted to a workqueue, we can have the
* application entering polling for a command before it gets
* forever, while the workqueue is stuck trying to acquire the
* very same mutex.
*/
- if (!(++iters & 7)) {
+ 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);
- }
-
- ret = io_iopoll_getevents(ctx, &nr_events, min);
- if (ret <= 0)
- break;
- ret = 0;
- } while (min && !nr_events && !need_resched());
+ /* 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;
}
* thread.
*/
if (req->flags & REQ_F_ISREG) {
- struct inode *inode = file_inode(req->file);
+ struct super_block *sb = file_inode(req->file)->i_sb;
- __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
+ __sb_writers_acquired(sb, SB_FREEZE_WRITE);
+ sb_end_write(sb);
}
- file_end_write(req->file);
-}
-
-static void io_complete_rw_common(struct kiocb *kiocb, long res,
- struct io_comp_state *cs)
-{
- struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
- int cflags = 0;
-
- if (kiocb->ki_flags & IOCB_WRITE)
- kiocb_end_write(req);
-
- if (res != req->result)
- req_set_fail_links(req);
- if (req->flags & REQ_F_BUFFER_SELECTED)
- cflags = io_put_rw_kbuf(req);
- __io_req_complete(req, res, cflags, cs);
}
#ifdef CONFIG_BLOCK
-static bool io_resubmit_prep(struct io_kiocb *req, int error)
+static bool io_resubmit_prep(struct io_kiocb *req)
{
- req_set_fail_links(req);
- return false;
+ 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;
}
-#endif
-static bool io_rw_reissue(struct io_kiocb *req, long res)
+static bool io_rw_should_reissue(struct io_kiocb *req)
{
-#ifdef CONFIG_BLOCK
umode_t mode = file_inode(req->file)->i_mode;
- int ret;
+ struct io_ring_ctx *ctx = req->ctx;
if (!S_ISBLK(mode) && !S_ISREG(mode))
return false;
- if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
+ 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(&req->ctx->refs))
+ 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;
+}
- ret = io_sq_thread_acquire_mm(req->ctx, req);
+static inline int io_fixup_rw_res(struct io_kiocb *req, unsigned res)
+{
+ struct io_async_rw *io = req->async_data;
- if (io_resubmit_prep(req, ret)) {
- refcount_inc(&req->refs);
- io_queue_async_work(req);
- return true;
+ /* 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;
+}
-#endif
- return false;
+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,
- struct io_comp_state *cs)
+ unsigned int issue_flags)
{
- if (!io_rw_reissue(req, res))
- io_complete_rw_common(&req->rw.kiocb, res, cs);
+ 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);
- __io_complete_rw(req, res, res2, NULL);
+ 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)
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
-
- if (res != -EAGAIN && res != req->result)
- req_set_fail_links(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_poll_complete() checking ->result */
+ /* 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_iopoll_getevents() thread before the issuer is done
+ * 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
* different devices.
*/
if (list_empty(&ctx->iopoll_list)) {
- ctx->poll_multi_file = false;
- } else if (!ctx->poll_multi_file) {
+ 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,
- iopoll_entry);
- if (list_req->file != req->file)
- ctx->poll_multi_file = true;
+ 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;
+ }
}
/*
* it to the front so we find it first.
*/
if (READ_ONCE(req->iopoll_completed))
- list_add(&req->iopoll_entry, &ctx->iopoll_list);
+ list_add(&req->inflight_entry, &ctx->iopoll_list);
else
- list_add_tail(&req->iopoll_entry, &ctx->iopoll_list);
-
- if ((ctx->flags & IORING_SETUP_SQPOLL) &&
- wq_has_sleeper(&ctx->sq_data->wait))
- wake_up(&ctx->sq_data->wait);
-}
-
-static void __io_state_file_put(struct io_submit_state *state)
-{
- if (state->has_refs)
- fput_many(state->file, state->has_refs);
- state->file = NULL;
-}
-
-static inline void io_state_file_put(struct io_submit_state *state)
-{
- if (state->file)
- __io_state_file_put(state);
-}
+ list_add_tail(&req->inflight_entry, &ctx->iopoll_list);
-/*
- * Get as many references to a file as we have IOs left in this submission,
- * assuming most submissions are for one file, or at least that each file
- * has more than one submission.
- */
-static struct file *__io_file_get(struct io_submit_state *state, int fd)
-{
- if (!state)
- return fget(fd);
+ 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);
- if (state->file) {
- if (state->fd == fd) {
- state->has_refs--;
- return state->file;
- }
- __io_state_file_put(state);
+ mutex_unlock(&ctx->uring_lock);
}
- state->file = fget_many(fd, state->ios_left);
- if (!state->file)
- return NULL;
-
- state->fd = fd;
- state->has_refs = state->ios_left - 1;
- return state->file;
}
static bool io_bdev_nowait(struct block_device *bdev)
{
-#ifdef CONFIG_BLOCK
return !bdev || blk_queue_nowait(bdev_get_queue(bdev));
-#else
- return true;
-#endif
}
/*
* any file. For now, just ensure that anything potentially problematic is done
* inline.
*/
-static bool io_file_supports_async(struct file *file, int rw)
+static bool __io_file_supports_nowait(struct file *file, int rw)
{
umode_t mode = file_inode(file)->i_mode;
if (S_ISBLK(mode)) {
- if (io_bdev_nowait(file->f_inode->i_bdev))
+ 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 (io_bdev_nowait(file->f_inode->i_sb->s_bdev) &&
+ 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;
return file->f_op->write_iter != NULL;
}
-static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+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 (S_ISREG(file_inode(req->file)->i_mode))
+ 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 && !(req->file->f_mode & FMODE_STREAM)) {
- req->flags |= REQ_F_CUR_POS;
- kiocb->ki_pos = req->file->f_pos;
+ 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);
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);
} else
kiocb->ki_ioprio = get_current_ioprio();
- /* don't allow async punt if RWF_NOWAIT was requested */
- if (kiocb->ki_flags & IOCB_NOWAIT)
- req->flags |= REQ_F_NOWAIT;
-
if (ctx->flags & IORING_SETUP_IOPOLL) {
if (!(kiocb->ki_flags & IOCB_DIRECT) ||
!kiocb->ki_filp->f_op->iopoll)
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);
- req->buf_index = READ_ONCE(sqe->buf_index);
return 0;
}
}
static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
- struct io_comp_state *cs)
+ unsigned int issue_flags)
{
struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
- struct io_async_rw *io = req->async_data;
-
- /* add previously done IO, if any */
- if (io && io->bytes_done > 0) {
- if (ret < 0)
- ret = io->bytes_done;
- else
- ret += io->bytes_done;
- }
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, cs);
+ 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 ssize_t io_import_fixed(struct io_kiocb *req, int rw,
- struct iov_iter *iter)
+static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter,
+ struct io_mapped_ubuf *imu)
{
- struct io_ring_ctx *ctx = req->ctx;
size_t len = req->rw.len;
- struct io_mapped_ubuf *imu;
- u16 index, buf_index = req->buf_index;
+ u64 buf_end, buf_addr = req->rw.addr;
size_t offset;
- u64 buf_addr;
- if (unlikely(buf_index >= ctx->nr_user_bufs))
- return -EFAULT;
- index = array_index_nospec(buf_index, ctx->nr_user_bufs);
- imu = &ctx->user_bufs[index];
- buf_addr = req->rw.addr;
-
- /* overflow */
- if (buf_addr + len < buf_addr)
+ if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
return -EFAULT;
/* not inside the mapped region */
- if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len)
+ if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end))
return -EFAULT;
/*
}
}
- return len;
+ 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)
return __io_iov_buffer_select(req, iov, needs_lock);
}
-static ssize_t __io_import_iovec(int rw, struct io_kiocb *req,
- struct iovec **iovec, struct iov_iter *iter,
- bool 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;
- u8 opcode;
- opcode = req->opcode;
if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) {
*iovec = NULL;
return io_import_fixed(req, rw, iter);
if (req->flags & REQ_F_BUFFER_SELECT) {
ret = io_iov_buffer_select(req, *iovec, needs_lock);
- if (!ret) {
- ret = (*iovec)->iov_len;
- iov_iter_init(iter, rw, *iovec, 1, ret);
- }
+ if (!ret)
+ iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len);
*iovec = NULL;
return ret;
}
req->ctx->compat);
}
-static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
- struct iovec **iovec, struct iov_iter *iter,
- bool needs_lock)
-{
- struct io_async_rw *iorw = req->async_data;
-
- if (!iorw)
- return __io_import_iovec(rw, req, iovec, iter, needs_lock);
- *iovec = NULL;
- return 0;
-}
-
static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb)
{
return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos;
}
}
-static inline int __io_alloc_async_data(struct io_kiocb *req)
+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_alloc_async_data(struct io_kiocb *req)
-{
- if (!io_op_defs[req->opcode].needs_async_data)
- return 0;
-
- return __io_alloc_async_data(req);
-}
-
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_data)
+ if (!force && !io_op_defs[req->opcode].needs_async_setup)
return 0;
if (!req->async_data) {
- if (__io_alloc_async_data(req))
+ 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;
}
{
struct io_async_rw *iorw = req->async_data;
struct iovec *iov = iorw->fast_iov;
- ssize_t ret;
+ int ret;
- ret = __io_import_iovec(rw, req, &iov, &iorw->iter, false);
+ ret = io_import_iovec(rw, req, &iov, &iorw->iter, false);
if (unlikely(ret < 0))
return ret;
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)
{
- ssize_t ret;
-
- ret = io_prep_rw(req, sqe);
- if (ret)
- return ret;
-
if (unlikely(!(req->file->f_mode & FMODE_READ)))
return -EBADF;
-
- /* either don't need iovec imported or already have it */
- if (!req->async_data)
- return 0;
- return io_rw_prep_async(req, READ);
+ return io_prep_rw(req, sqe, READ);
}
/*
struct wait_page_queue *wpq;
struct io_kiocb *req = wait->private;
struct wait_page_key *key = arg;
- int ret;
wpq = container_of(wait, struct wait_page_queue, wait);
req->rw.kiocb.ki_flags &= ~IOCB_WAITQ;
list_del_init(&wait->entry);
-
- init_task_work(&req->task_work, io_req_task_submit);
- percpu_ref_get(&req->ctx->refs);
-
- /* submit ref gets dropped, acquire a new one */
- refcount_inc(&req->refs);
- ret = io_req_task_work_add(req, true);
- if (unlikely(ret)) {
- struct task_struct *tsk;
-
- /* queue just for cancelation */
- init_task_work(&req->task_work, io_req_task_cancel);
- tsk = io_wq_get_task(req->ctx->io_wq);
- task_work_add(tsk, &req->task_work, TWA_NONE);
- wake_up_process(tsk);
- }
+ io_req_task_queue(req);
return 1;
}
return true;
}
-static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter)
+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);
return -EINVAL;
}
-static int io_read(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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 iov_iter iter_cp;
struct io_async_rw *rw = req->async_data;
- ssize_t io_size, ret, ret2;
- bool no_async;
+ bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
+ struct iov_iter_state __state, *state;
+ ssize_t ret, ret2;
- if (rw)
+ if (rw) {
iter = &rw->iter;
-
- ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);
- if (ret < 0)
- return ret;
- iter_cp = *iter;
- io_size = iov_iter_count(iter);
- req->result = io_size;
- ret = 0;
+ 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)
else
kiocb->ki_flags |= IOCB_NOWAIT;
-
/* If the file doesn't support async, just async punt */
- no_async = force_nonblock && !io_file_supports_async(req->file, READ);
- if (no_async)
- goto copy_iov;
+ 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), io_size);
- if (unlikely(ret))
- goto out_free;
+ 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) {
- goto done;
- } else if (ret == -EIOCBQUEUED) {
- ret = 0;
- goto out_free;
- } else if (ret == -EAGAIN) {
+ 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 marked file */
- if (req->file->f_flags & O_NONBLOCK)
+ /* no retry on NONBLOCK nor RWF_NOWAIT */
+ if (req->flags & REQ_F_NOWAIT)
goto done;
- /* some cases will consume bytes even on error returns */
- *iter = iter_cp;
ret = 0;
- goto copy_iov;
- } else if (ret < 0) {
- /* make sure -ERESTARTSYS -> -EINTR is done */
+ } 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;
}
- /* read it all, or we did blocking attempt. no retry. */
- if (!iov_iter_count(iter) || !force_nonblock ||
- (req->file->f_flags & O_NONBLOCK) || !(req->flags & REQ_F_ISREG))
- 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);
- io_size -= ret;
-copy_iov:
ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
- if (ret2) {
- ret = ret2;
- goto out_free;
- }
- if (no_async)
- return -EAGAIN;
- rw = req->async_data;
- /* it's copied and will be cleaned with ->io */
- iovec = NULL;
- /* now use our persistent iterator, if we aren't already */
- iter = &rw->iter;
-retry:
- rw->bytes_done += ret;
- /* if we can retry, do so with the callbacks armed */
- if (!io_rw_should_retry(req)) {
- kiocb->ki_flags &= ~IOCB_WAITQ;
- return -EAGAIN;
- }
+ if (ret2)
+ return ret2;
+ iovec = NULL;
+ rw = req->async_data;
/*
- * 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.
+ * Now use our persistent iterator and state, if we aren't already.
+ * We've restored and mapped the iter to match.
*/
- ret = io_iter_do_read(req, iter);
- if (ret == -EIOCBQUEUED) {
- ret = 0;
- goto out_free;
- } else if (ret > 0 && ret < io_size) {
+ 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;
- goto retry;
- }
+ iov_iter_restore(iter, state);
+ } while (ret > 0);
done:
- kiocb_done(kiocb, ret, cs);
- ret = 0;
+ kiocb_done(kiocb, ret, issue_flags);
out_free:
- /* it's reportedly faster than delegating the null check to kfree() */
+ /* it's faster to check here then delegate to kfree */
if (iovec)
kfree(iovec);
- return ret;
+ return 0;
}
static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
- ssize_t ret;
-
- ret = io_prep_rw(req, sqe);
- if (ret)
- return ret;
-
if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
return -EBADF;
-
- /* either don't need iovec imported or already have it */
- if (!req->async_data)
- return 0;
- return io_rw_prep_async(req, WRITE);
+ return io_prep_rw(req, sqe, WRITE);
}
-static int io_write(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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 iov_iter iter_cp;
struct io_async_rw *rw = req->async_data;
- ssize_t ret, ret2, io_size;
+ bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
+ struct iov_iter_state __state, *state;
+ ssize_t ret, ret2;
- if (rw)
+ if (rw) {
iter = &rw->iter;
-
- ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);
- if (ret < 0)
- return ret;
- iter_cp = *iter;
- io_size = iov_iter_count(iter);
- req->result = io_size;
+ 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;
/* If the file doesn't support async, just async punt */
- if (force_nonblock && !io_file_supports_async(req->file, WRITE))
+ if (force_nonblock && !io_file_supports_nowait(req, WRITE))
goto copy_iov;
/* file path doesn't support NOWAIT for non-direct_IO */
(req->flags & REQ_F_ISREG))
goto copy_iov;
- ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size);
+ ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result);
if (unlikely(ret))
goto out_free;
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 marked file */
- if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK))
+ /* 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, cs);
+ kiocb_done(kiocb, ret2, issue_flags);
} else {
copy_iov:
- /* some cases will consume bytes even on error returns */
- *iter = iter_cp;
+ iov_iter_restore(iter, state);
ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
- if (!ret)
+ 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() */
return ret;
}
-static int __io_splice_prep(struct io_kiocb *req,
+static int io_renameat_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;
+ 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;
- sp->file_in = NULL;
- sp->len = READ_ONCE(sqe->len);
- sp->flags = READ_ONCE(sqe->splice_flags);
+ 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);
- if (unlikely(sp->flags & ~valid_flags))
- return -EINVAL;
+ ren->oldpath = getname(oldf);
+ if (IS_ERR(ren->oldpath))
+ return PTR_ERR(ren->oldpath);
- sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in),
- (sp->flags & SPLICE_F_FD_IN_FIXED));
- if (!sp->file_in)
+ 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;
+}
- if (!S_ISREG(file_inode(sp->file_in)->i_mode)) {
- /*
- * Splice operation will be punted aync, and here need to
- * modify io_wq_work.flags, so initialize io_wq_work firstly.
- */
- io_req_init_async(req);
- req->work.flags |= IO_WQ_WORK_UNBOUND;
- }
+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_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, &ret);
+ if (unlikely(!sock))
+ return ret;
+
+ 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;
}
return __io_splice_prep(req, sqe);
}
-static int io_tee(struct io_kiocb *req, bool force_nonblock)
+static int io_tee(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = &req->splice;
- struct file *in = sp->file_in;
struct file *out = sp->file_out;
unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
+ struct file *in;
long ret = 0;
- if (force_nonblock)
+ 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);
- io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED));
- req->flags &= ~REQ_F_NEED_CLEANUP;
-
+ if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
+ io_put_file(in);
+done:
if (ret != sp->len)
- req_set_fail_links(req);
+ 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;
+ 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, bool force_nonblock)
+static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_splice *sp = &req->splice;
- struct file *in = sp->file_in;
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 (force_nonblock)
+ 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);
- io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED));
- req->flags &= ~REQ_F_NEED_CLEANUP;
-
+ if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
+ io_put_file(in);
+done:
if (ret != sp->len)
- req_set_fail_links(req);
+ 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, struct io_comp_state *cs)
+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, 0, 0, cs);
+ __io_req_complete(req, issue_flags, 0, 0);
return 0;
}
-static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
- if (!req->file)
- return -EBADF;
-
if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
return 0;
}
-static int io_fsync(struct io_kiocb *req, bool force_nonblock)
+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 (force_nonblock)
+ 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_links(req);
+ req_set_fail(req);
io_req_complete(req, ret);
return 0;
}
return 0;
}
-static int io_fallocate(struct io_kiocb *req, bool force_nonblock)
+static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
{
int ret;
/* fallocate always requiring blocking context */
- if (force_nonblock)
+ 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_links(req);
+ req_set_fail(req);
+ else
+ fsnotify_modify(req->file);
io_req_complete(req, ret);
return 0;
}
const char __user *fname;
int ret;
- if (unlikely(sqe->ioprio || sqe->buf_index || sqe->splice_fd_in))
+ 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;
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->open.ignore_nonblock = false;
req->flags |= REQ_F_NEED_CLEANUP;
return 0;
}
static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
- u64 flags, mode;
+ u64 mode = READ_ONCE(sqe->len);
+ u64 flags = READ_ONCE(sqe->open_flags);
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
- return -EINVAL;
- mode = READ_ONCE(sqe->len);
- flags = READ_ONCE(sqe->open_flags);
req->open.how = build_open_how(flags, mode);
return __io_openat_prep(req, sqe);
}
size_t len;
int ret;
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
- return -EINVAL;
how = u64_to_user_ptr(READ_ONCE(sqe->addr2));
len = READ_ONCE(sqe->len);
if (len < OPEN_HOW_SIZE_VER0)
return __io_openat_prep(req, sqe);
}
-static int io_openat2(struct io_kiocb *req, bool force_nonblock)
+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;
- if (force_nonblock && !req->open.ignore_nonblock)
- return -EAGAIN;
-
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;
+ }
- ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile);
- if (ret < 0)
- goto err;
+ 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)) {
- put_unused_fd(ret);
- ret = PTR_ERR(file);
/*
- * A work-around to ensure that /proc/self works that way
- * that it should - if we get -EOPNOTSUPP back, then assume
- * that proc_self_get_link() failed us because we're in async
- * context. We should be safe to retry this from the task
- * itself with force_nonblock == false set, as it should not
- * block on lookup. Would be nice to know this upfront and
- * avoid the async dance, but doesn't seem feasible.
+ * 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 (ret == -EOPNOTSUPP && io_wq_current_is_worker()) {
- req->open.ignore_nonblock = true;
- refcount_inc(&req->refs);
- io_req_task_queue(req);
- return 0;
- }
- } else {
- fsnotify_open(file);
- fd_install(ret, file);
+ 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_links(req);
- io_req_complete(req, ret);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
-static int io_openat(struct io_kiocb *req, bool force_nonblock)
+static int io_openat(struct io_kiocb *req, unsigned int issue_flags)
{
- return io_openat2(req, force_nonblock);
+ return io_openat2(req, issue_flags);
}
static int io_remove_buffers_prep(struct io_kiocb *req,
kfree(nxt);
if (++i == nbufs)
return i;
+ cond_resched();
}
i++;
kfree(buf);
return i;
}
-static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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);
if (head)
ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs);
if (ret < 0)
- req_set_fail_links(req);
+ req_set_fail(req);
- /* need to hold the lock to complete IOPOLL requests */
- if (ctx->flags & IORING_SETUP_IOPOLL) {
- __io_req_complete(req, ret, 0, cs);
- io_ring_submit_unlock(ctx, !force_nonblock);
- } else {
- io_ring_submit_unlock(ctx, !force_nonblock);
- __io_req_complete(req, ret, 0, cs);
- }
+ /* 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;
}
return i ? i : -ENOMEM;
}
-static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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);
ret = io_add_buffers(p, &head);
if (ret >= 0 && !list) {
- ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL);
+ 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_links(req);
-
- /* need to hold the lock to complete IOPOLL requests */
- if (ctx->flags & IORING_SETUP_IOPOLL) {
- __io_req_complete(req, ret, 0, cs);
- io_ring_submit_unlock(ctx, !force_nonblock);
- } else {
- io_ring_submit_unlock(ctx, !force_nonblock);
- __io_req_complete(req, ret, 0, cs);
- }
+ 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;
}
#if defined(CONFIG_EPOLL)
if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
return -EINVAL;
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL)))
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
req->epoll.epfd = READ_ONCE(sqe->fd);
#endif
}
-static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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_links(req);
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
-static int io_madvise(struct io_kiocb *req, bool force_nonblock)
+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 (force_nonblock)
+ 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_links(req);
+ req_set_fail(req);
io_req_complete(req, ret);
return 0;
#else
return 0;
}
-static int io_fadvise(struct io_kiocb *req, bool force_nonblock)
+static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_fadvise *fa = &req->fadvise;
int ret;
- if (force_nonblock) {
+ if (issue_flags & IO_URING_F_NONBLOCK) {
switch (fa->advice) {
case POSIX_FADV_NORMAL:
case POSIX_FADV_RANDOM:
ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
if (ret < 0)
- req_set_fail_links(req);
- io_req_complete(req, ret);
+ 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 | IORING_SETUP_SQPOLL)))
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
return -EINVAL;
return 0;
}
-static int io_statx(struct io_kiocb *req, bool force_nonblock)
+static int io_statx(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_statx *ctx = &req->statx;
int ret;
- if (force_nonblock)
+ 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_links(req);
+ 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 we queue this for async, it must not be cancellable. That would
- * leave the 'file' in an undeterminate state, and here need to modify
- * io_wq_work.flags, so initialize io_wq_work firstly.
- */
- io_req_init_async(req);
-
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ 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 || sqe->splice_fd_in)
+ sqe->rw_flags || sqe->buf_index)
return -EINVAL;
if (req->flags & REQ_F_FIXED_FILE)
return -EBADF;
req->close.fd = READ_ONCE(sqe->fd);
- if ((req->file && req->file->f_op == &io_uring_fops))
- return -EBADF;
+ req->close.file_slot = READ_ONCE(sqe->file_index);
+ if (req->close.file_slot && req->close.fd)
+ return -EINVAL;
- req->close.put_file = NULL;
return 0;
}
-static int io_close(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_close(struct io_kiocb *req, unsigned int issue_flags)
{
+ struct files_struct *files = current->files;
struct io_close *close = &req->close;
- int ret;
+ struct fdtable *fdt;
+ struct file *file = NULL;
+ int ret = -EBADF;
- /* might be already done during nonblock submission */
- if (!close->put_file) {
- ret = close_fd_get_file(close->fd, &close->put_file);
- if (ret < 0)
- return (ret == -ENOENT) ? -EBADF : ret;
+ 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 (close->put_file->f_op->flush && force_nonblock) {
- /* not safe to cancel at this point */
- req->work.flags |= IO_WQ_WORK_NO_CANCEL;
- /* was never set, but play safe */
- req->flags &= ~REQ_F_NOWAIT;
- /* avoid grabbing files - we don't need the files */
- req->flags |= REQ_F_NO_FILE_TABLE;
+ 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(close->put_file, req->work.identity->files);
+ ret = filp_close(file, current->files);
+err:
if (ret < 0)
- req_set_fail_links(req);
- fput(close->put_file);
- close->put_file = NULL;
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ if (file)
+ fput(file);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
-static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_ring_ctx *ctx = req->ctx;
- if (!req->file)
- return -EBADF;
-
if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
return 0;
}
-static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock)
+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 (force_nonblock)
+ 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_links(req);
+ req_set_fail(req);
io_req_complete(req, ret);
return 0;
}
if (async_msg)
return -EAGAIN;
if (io_alloc_async_data(req)) {
- if (kmsg->iov != kmsg->fast_iov)
- kfree(kmsg->iov);
+ 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->iov = iomsg->fast_iov;
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->iov);
+ req->sr_msg.msg_flags, &iomsg->free_iov);
}
-static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static int io_sendmsg_prep_async(struct io_kiocb *req)
{
- struct io_async_msghdr *async_msg = req->async_data;
- struct io_sr_msg *sr = &req->sr_msg;
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->splice_fd_in || sqe->ioprio))
+ if (unlikely(sqe->addr2 || sqe->file_index))
+ return -EINVAL;
+ if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio))
return -EINVAL;
- sr->msg_flags = READ_ONCE(sqe->msg_flags);
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
-
- if (!async_msg || !io_op_defs[req->opcode].needs_async_data)
- return 0;
- ret = io_sendmsg_copy_hdr(req, async_msg);
- if (!ret)
- req->flags |= REQ_F_NEED_CLEANUP;
- return ret;
+ return 0;
}
-static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_async_msghdr iomsg, *kmsg;
struct socket *sock;
if (unlikely(!sock))
return ret;
- if (req->async_data) {
- kmsg = req->async_data;
- kmsg->msg.msg_name = &kmsg->addr;
- /* if iov is set, it's allocated already */
- if (!kmsg->iov)
- kmsg->iov = kmsg->fast_iov;
- kmsg->msg.msg_iter.iov = kmsg->iov;
- } else {
+ 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 | MSG_NOSIGNAL;
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
+ 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 (force_nonblock && ret == -EAGAIN)
+ if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN)
return io_setup_async_msg(req, kmsg);
if (ret == -ERESTARTSYS)
ret = -EINTR;
- if (kmsg->iov != kmsg->fast_iov)
- kfree(kmsg->iov);
+ /* 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_links(req);
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
-static int io_send(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_send(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_sr_msg *sr = &req->sr_msg;
struct msghdr msg;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
- flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
+ 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 (force_nonblock && ret == -EAGAIN)
+ if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN)
return -EAGAIN;
if (ret == -ERESTARTSYS)
ret = -EINTR;
if (ret < min_ret)
- req_set_fail_links(req);
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
if (req->flags & REQ_F_BUFFER_SELECT) {
if (iov_len > 1)
return -EINVAL;
- if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov)))
+ if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov)))
return -EFAULT;
- sr->len = iomsg->iov[0].iov_len;
- iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1,
- sr->len);
- iomsg->iov = NULL;
+ 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->iov, &iomsg->msg.msg_iter,
+ &iomsg->free_iov, &iomsg->msg.msg_iter,
false);
if (ret > 0)
ret = 0;
static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
struct io_async_msghdr *iomsg)
{
- struct compat_msghdr __user *msg_compat;
struct io_sr_msg *sr = &req->sr_msg;
struct compat_iovec __user *uiov;
compat_uptr_t ptr;
compat_size_t len;
int ret;
- msg_compat = (struct compat_msghdr __user *) sr->umsg;
- ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr,
- &ptr, &len);
+ ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr,
+ &ptr, &len);
if (ret)
return ret;
if (clen < 0)
return -EINVAL;
sr->len = clen;
- iomsg->iov[0].iov_len = clen;
- iomsg->iov = NULL;
+ iomsg->free_iov = NULL;
} else {
+ iomsg->free_iov = iomsg->fast_iov;
ret = __import_iovec(READ, (struct iovec __user *)uiov, len,
- UIO_FASTIOV, &iomsg->iov,
+ UIO_FASTIOV, &iomsg->free_iov,
&iomsg->msg.msg_iter, true);
if (ret < 0)
return ret;
struct io_async_msghdr *iomsg)
{
iomsg->msg.msg_name = &iomsg->addr;
- iomsg->iov = iomsg->fast_iov;
#ifdef CONFIG_COMPAT
if (req->ctx->compat)
return io_put_kbuf(req, req->sr_msg.kbuf);
}
-static int io_recvmsg_prep(struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static int io_recvmsg_prep_async(struct io_kiocb *req)
{
- struct io_async_msghdr *async_msg = req->async_data;
- struct io_sr_msg *sr = &req->sr_msg;
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->splice_fd_in || sqe->ioprio))
+ if (unlikely(sqe->addr2 || sqe->file_index))
+ return -EINVAL;
+ if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio))
return -EINVAL;
- sr->msg_flags = READ_ONCE(sqe->msg_flags);
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
-
- if (!async_msg || !io_op_defs[req->opcode].needs_async_data)
- return 0;
- ret = io_recvmsg_copy_hdr(req, async_msg);
- if (!ret)
- req->flags |= REQ_F_NEED_CLEANUP;
- return ret;
+ return 0;
}
-static int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_recvmsg(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, cflags = 0;
+ bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
sock = sock_from_file(req->file, &ret);
if (unlikely(!sock))
return ret;
- if (req->async_data) {
- kmsg = req->async_data;
- kmsg->msg.msg_name = &kmsg->addr;
- /* if iov is set, it's allocated already */
- if (!kmsg->iov)
- kmsg->iov = kmsg->fast_iov;
- kmsg->msg.msg_iter.iov = kmsg->iov;
- } else {
+ kmsg = req->async_data;
+ if (!kmsg) {
ret = io_recvmsg_copy_hdr(req, &iomsg);
if (ret)
return ret;
if (IS_ERR(kbuf))
return PTR_ERR(kbuf);
kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
- iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov,
+ 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 | MSG_NOSIGNAL;
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
+ 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);
if (req->flags & REQ_F_BUFFER_SELECTED)
cflags = io_put_recv_kbuf(req);
- if (kmsg->iov != kmsg->fast_iov)
- kfree(kmsg->iov);
+ /* 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_links(req);
- __io_req_complete(req, ret, cflags, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, cflags);
return 0;
}
-static int io_recv(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_buffer *kbuf;
struct io_sr_msg *sr = &req->sr_msg;
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, &ret);
if (unlikely(!sock))
msg.msg_iocb = NULL;
msg.msg_flags = 0;
- flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
- if (flags & MSG_DONTWAIT)
- req->flags |= REQ_F_NOWAIT;
- else if (force_nonblock)
+ flags = req->sr_msg.msg_flags;
+ if (force_nonblock)
flags |= MSG_DONTWAIT;
-
if (flags & MSG_WAITALL)
min_ret = iov_iter_count(&msg.msg_iter);
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_links(req);
- __io_req_complete(req, ret, cflags, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, cflags);
return 0;
}
{
struct io_accept *accept = &req->accept;
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
- if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->splice_fd_in)
+ 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, bool force_nonblock,
- struct io_comp_state *cs)
+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;
- int ret;
+ bool fixed = !!accept->file_slot;
+ struct file *file;
+ int ret, fd;
if (req->file->f_flags & O_NONBLOCK)
req->flags |= REQ_F_NOWAIT;
- ret = __sys_accept4_file(req->file, file_flags, accept->addr,
- accept->addr_len, accept->flags,
- accept->nofile);
- if (ret == -EAGAIN && force_nonblock)
- return -EAGAIN;
- if (ret < 0) {
+ 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_links(req);
+ 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, ret, 0, cs);
+ __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;
- struct io_async_connect *io = req->async_data;
- if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
+ 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)
conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
conn->addr_len = READ_ONCE(sqe->addr2);
-
- if (!io)
- return 0;
-
- return move_addr_to_kernel(conn->addr, conn->addr_len,
- &io->address);
+ return 0;
}
-static int io_connect(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+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;
ret = -ENOMEM;
goto out;
}
- io = req->async_data;
memcpy(req->async_data, &__io, sizeof(__io));
return -EAGAIN;
}
ret = -EINTR;
out:
if (ret < 0)
- req_set_fail_links(req);
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
#else /* !CONFIG_NET */
-static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+#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)
{
- return -EOPNOTSUPP;
+ 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);
}
-static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+/*
+ * 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)
{
- return -EOPNOTSUPP;
+ 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 int io_send(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static void io_poll_mark_cancelled(struct io_kiocb *req)
{
- return -EOPNOTSUPP;
+ atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs);
}
-static int io_recvmsg_prep(struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req)
{
- return -EOPNOTSUPP;
+ /* 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 int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req)
{
- return -EOPNOTSUPP;
+ if (req->opcode == IORING_OP_POLL_ADD)
+ return &req->poll;
+ return &req->apoll->poll;
}
-static int io_recv(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static void io_poll_req_insert(struct io_kiocb *req)
{
- return -EOPNOTSUPP;
+ 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 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events,
+ wait_queue_func_t wake_func)
{
- return -EOPNOTSUPP;
+ 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 int io_accept(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static inline void io_poll_remove_entry(struct io_poll_iocb *poll)
{
- return -EOPNOTSUPP;
+ 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 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+static void io_poll_remove_entries(struct io_kiocb *req)
{
- return -EOPNOTSUPP;
+ 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();
}
-static int io_connect(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+/*
+ * 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)
{
- return -EOPNOTSUPP;
-}
-#endif /* CONFIG_NET */
+ struct io_ring_ctx *ctx = req->ctx;
+ struct io_poll_iocb *poll = io_poll_get_single(req);
+ int v;
-struct io_poll_table {
- struct poll_table_struct pt;
- struct io_kiocb *req;
- int nr_entries;
- int error;
-};
+ /* req->task == current here, checking PF_EXITING is safe */
+ if (unlikely(req->task->flags & PF_EXITING))
+ io_poll_mark_cancelled(req);
-static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
- __poll_t mask, task_work_func_t func)
-{
- bool twa_signal_ok;
- int ret;
+ do {
+ v = atomic_read(&req->poll_refs);
- /* for instances that support it check for an event match first: */
- if (mask && !(mask & poll->events))
- return 0;
+ /* 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;
+ }
- trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask);
+ if (!req->result) {
+ struct poll_table_struct pt = { ._key = poll->events };
- list_del_init(&poll->wait.entry);
+ req->result = vfs_poll(req->file, &pt) & poll->events;
+ }
- req->result = mask;
- init_task_work(&req->task_work, func);
- percpu_ref_get(&req->ctx->refs);
+ /* multishot, just fill an CQE and proceed */
+ if (req->result && !(poll->events & EPOLLONESHOT)) {
+ __poll_t mask = mangle_poll(req->result & poll->events);
+ bool filled;
- /*
- * If we using the signalfd wait_queue_head for this wakeup, then
- * it's not safe to use TWA_SIGNAL as we could be recursing on the
- * tsk->sighand->siglock on doing the wakeup. Should not be needed
- * either, as the normal wakeup will suffice.
- */
- twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh);
+ 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;
+ }
- /*
- * If this fails, then the task is exiting. When a task exits, the
- * work gets canceled, so just cancel this request as well instead
- * of executing it. We can't safely execute it anyway, as we may not
- * have the needed state needed for it anyway.
- */
- ret = io_req_task_work_add(req, twa_signal_ok);
- if (unlikely(ret)) {
- struct task_struct *tsk;
+ /* 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);
- WRITE_ONCE(poll->canceled, true);
- tsk = io_wq_get_task(req->ctx->io_wq);
- task_work_add(tsk, &req->task_work, TWA_NONE);
- wake_up_process(tsk);
- }
return 1;
}
-static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll)
- __acquires(&req->ctx->completion_lock)
+static void io_poll_task_func(struct io_kiocb *req, bool *locked)
{
struct io_ring_ctx *ctx = req->ctx;
+ int ret;
- if (!req->result && !READ_ONCE(poll->canceled)) {
- struct poll_table_struct pt = { ._key = poll->events };
-
- req->result = vfs_poll(req->file, &pt) & poll->events;
- }
+ ret = io_poll_check_events(req);
+ if (ret > 0)
+ return;
- spin_lock_irq(&ctx->completion_lock);
- if (!req->result && !READ_ONCE(poll->canceled)) {
- add_wait_queue(poll->head, &poll->wait);
- return true;
+ if (!ret) {
+ req->result = mangle_poll(req->result & req->poll.events);
+ } else {
+ req->result = ret;
+ req_set_fail(req);
}
- return false;
-}
-
-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;
+ 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_poll_remove_double(struct io_kiocb *req)
+static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
{
- struct io_poll_iocb *poll = io_poll_get_double(req);
+ struct io_ring_ctx *ctx = req->ctx;
+ int ret;
- lockdep_assert_held(&req->ctx->completion_lock);
+ ret = io_poll_check_events(req);
+ if (ret > 0)
+ return;
- if (poll && poll->head) {
- struct wait_queue_head *head = poll->head;
+ io_poll_remove_entries(req);
+ spin_lock(&ctx->completion_lock);
+ hash_del(&req->hash_node);
+ spin_unlock(&ctx->completion_lock);
- spin_lock(&head->lock);
- list_del_init(&poll->wait.entry);
- if (poll->wait.private)
- refcount_dec(&req->refs);
- poll->head = NULL;
- spin_unlock(&head->lock);
- }
+ if (!ret)
+ io_req_task_submit(req, locked);
+ else
+ io_req_complete_failed(req, ret);
}
-static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error)
+static void __io_poll_execute(struct io_kiocb *req, int mask)
{
- struct io_ring_ctx *ctx = req->ctx;
+ 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;
- io_poll_remove_double(req);
- req->poll.done = true;
- io_cqring_fill_event(req, error ? error : mangle_poll(mask));
- io_commit_cqring(ctx);
+ trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask);
+ io_req_task_work_add(req);
}
-static void io_poll_task_func(struct callback_head *cb)
+static inline void io_poll_execute(struct io_kiocb *req, int res)
{
- struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
- struct io_ring_ctx *ctx = req->ctx;
- struct io_kiocb *nxt;
-
- if (io_poll_rewait(req, &req->poll)) {
- spin_unlock_irq(&ctx->completion_lock);
- } else {
- hash_del(&req->hash_node);
- io_poll_complete(req, req->result, 0);
- spin_unlock_irq(&ctx->completion_lock);
-
- nxt = io_put_req_find_next(req);
- io_cqring_ev_posted(ctx);
- if (nxt)
- __io_req_task_submit(nxt);
- }
+ if (io_poll_get_ownership(req))
+ __io_poll_execute(req, res);
+}
- percpu_ref_put(&ctx->refs);
+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_double_wake(struct wait_queue_entry *wait, unsigned mode,
- int sync, void *key)
+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 = io_poll_get_single(req);
+ struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb,
+ wait);
__poll_t mask = key_to_poll(key);
- /* for instances that support it check for an event match first: */
- if (mask && !(mask & poll->events))
- return 0;
+ 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);
- list_del_init(&wait->entry);
+ /*
+ * 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);
- if (poll && poll->head) {
- bool done;
-
- spin_lock(&poll->head->lock);
- done = list_empty(&poll->wait.entry);
- if (!done)
- list_del_init(&poll->wait.entry);
- /* make sure double remove sees this as being gone */
- wait->private = NULL;
- spin_unlock(&poll->head->lock);
- if (!done) {
- /* use wait func handler, so it matches the rq type */
- poll->wait.func(&poll->wait, mode, sync, key);
- }
+ /*
+ * 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;
}
- refcount_dec(&req->refs);
+
+ /* 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_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events,
- wait_queue_func_t wake_func)
-{
- poll->head = NULL;
- poll->done = false;
- poll->canceled = false;
- poll->events = events;
- INIT_LIST_HEAD(&poll->wait.entry);
- init_waitqueue_func_entry(&poll->wait, wake_func);
-}
-
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)
* if this happens.
*/
if (unlikely(pt->nr_entries)) {
- struct io_poll_iocb *poll_one = poll;
+ 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;
}
- /* double add on the same waitqueue head, ignore */
- if (poll->head == head)
- return;
+
poll = kmalloc(sizeof(*poll), GFP_ATOMIC);
if (!poll) {
pt->error = -ENOMEM;
return;
}
- io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake);
- refcount_inc(&req->refs);
- poll->wait.private = req;
+ 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);
add_wait_queue(head, &poll->wait);
}
-static void io_async_queue_proc(struct file *file, struct wait_queue_head *head,
+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);
- struct async_poll *apoll = pt->req->apoll;
-
- __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll);
-}
-
-static void io_async_task_func(struct callback_head *cb)
-{
- struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
- struct async_poll *apoll = req->apoll;
- struct io_ring_ctx *ctx = req->ctx;
-
- trace_io_uring_task_run(req->ctx, req->opcode, req->user_data);
-
- if (io_poll_rewait(req, &apoll->poll)) {
- spin_unlock_irq(&ctx->completion_lock);
- percpu_ref_put(&ctx->refs);
- return;
- }
-
- /* If req is still hashed, it cannot have been canceled. Don't check. */
- if (hash_hashed(&req->hash_node))
- hash_del(&req->hash_node);
-
- io_poll_remove_double(req);
- spin_unlock_irq(&ctx->completion_lock);
-
- if (!READ_ONCE(apoll->poll.canceled))
- __io_req_task_submit(req);
- else
- __io_req_task_cancel(req, -ECANCELED);
- percpu_ref_put(&ctx->refs);
- kfree(apoll->double_poll);
- kfree(apoll);
-}
-
-static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
- void *key)
-{
- struct io_kiocb *req = wait->private;
- struct io_poll_iocb *poll = &req->apoll->poll;
-
- trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data,
- key_to_poll(key));
-
- return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func);
-}
-
-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);
+ __io_queue_proc(&pt->req->poll, pt, head,
+ (struct io_poll_iocb **) &pt->req->async_data);
}
-static __poll_t __io_arm_poll_handler(struct io_kiocb *req,
- struct io_poll_iocb *poll,
- struct io_poll_table *ipt, __poll_t mask,
- wait_queue_func_t wake_func)
- __acquires(&ctx->completion_lock)
+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;
- bool cancel = false;
-
- if (req->file->f_op->may_pollfree) {
- spin_lock_irq(&ctx->completion_lock);
- return -EOPNOTSUPP;
- }
INIT_HLIST_NODE(&req->hash_node);
- io_init_poll_iocb(poll, mask, wake_func);
+ io_init_poll_iocb(poll, mask, io_poll_wake);
poll->file = req->file;
poll->wait.private = 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 (unlikely(!ipt->nr_entries) && !ipt->error)
- ipt->error = -EINVAL;
-
- spin_lock_irq(&ctx->completion_lock);
- if (ipt->error)
- io_poll_remove_double(req);
- if (likely(poll->head)) {
- spin_lock(&poll->head->lock);
- if (unlikely(list_empty(&poll->wait.entry))) {
- if (ipt->error)
- cancel = true;
+
+ 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;
- mask = 0;
}
- if (mask || ipt->error)
- list_del_init(&poll->wait.entry);
- else if (cancel)
- WRITE_ONCE(poll->canceled, true);
- else if (!poll->done) /* actually waiting for an event */
- io_poll_req_insert(req);
- spin_unlock(&poll->head->lock);
+ __io_poll_execute(req, mask);
+ return 0;
}
- return mask;
+ /*
+ * 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);
}
-static bool io_arm_poll_handler(struct io_kiocb *req)
+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, ret;
- int rw;
+ __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI;
+ int ret;
if (!req->file || !file_can_poll(req->file))
- return false;
+ return IO_APOLL_ABORTED;
if (req->flags & REQ_F_POLLED)
- return false;
- if (def->pollin)
- rw = READ;
- else if (def->pollout)
- rw = WRITE;
- else
- return false;
- /* if we can't nonblock try, then no point in arming a poll handler */
- if (!io_file_supports_async(req->file, rw))
- return false;
+ 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 false;
+ return IO_APOLL_ABORTED;
apoll->double_poll = NULL;
-
- req->flags |= REQ_F_POLLED;
req->apoll = apoll;
-
- mask = 0;
- if (def->pollin)
- mask |= POLLIN | POLLRDNORM;
- if (def->pollout)
- mask |= POLLOUT | POLLWRNORM;
-
- /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */
- if ((req->opcode == IORING_OP_RECVMSG) &&
- (req->sr_msg.msg_flags & MSG_ERRQUEUE))
- mask &= ~POLLIN;
-
- mask |= POLLERR | POLLPRI;
-
+ req->flags |= REQ_F_POLLED;
ipt.pt._qproc = io_async_queue_proc;
- ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask,
- io_async_wake);
- if (ret || ipt.error) {
- io_poll_remove_double(req);
- spin_unlock_irq(&ctx->completion_lock);
- kfree(apoll->double_poll);
- kfree(apoll);
- return false;
- }
- spin_unlock_irq(&ctx->completion_lock);
- trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask,
- apoll->poll.events);
- return true;
-}
-
-static bool __io_poll_remove_one(struct io_kiocb *req,
- struct io_poll_iocb *poll)
-{
- bool do_complete = false;
-
- spin_lock(&poll->head->lock);
- WRITE_ONCE(poll->canceled, true);
- if (!list_empty(&poll->wait.entry)) {
- list_del_init(&poll->wait.entry);
- do_complete = true;
- }
- spin_unlock(&poll->head->lock);
- hash_del(&req->hash_node);
- return do_complete;
-}
-
-static bool io_poll_remove_one(struct io_kiocb *req)
-{
- bool do_complete;
-
- io_poll_remove_double(req);
-
- if (req->opcode == IORING_OP_POLL_ADD) {
- do_complete = __io_poll_remove_one(req, &req->poll);
- } else {
- struct async_poll *apoll = req->apoll;
-
- /* non-poll requests have submit ref still */
- do_complete = __io_poll_remove_one(req, &apoll->poll);
- if (do_complete) {
- io_put_req(req);
- kfree(apoll->double_poll);
- kfree(apoll);
- }
- }
-
- if (do_complete) {
- io_cqring_fill_event(req, -ECANCELED);
- io_commit_cqring(req->ctx);
- req_set_fail_links(req);
- io_put_req_deferred(req, 1);
- }
+ ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask);
+ if (ret || ipt.error)
+ return ret ? IO_APOLL_READY : IO_APOLL_ABORTED;
- return do_complete;
+ 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,
- struct files_struct *files)
+ bool cancel_all)
{
struct hlist_node *tmp;
struct io_kiocb *req;
- int posted = 0, i;
+ bool found = false;
+ int i;
- spin_lock_irq(&ctx->completion_lock);
+ 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(req, tsk, files))
- posted += io_poll_remove_one(req);
+ if (io_match_task_safe(req, tsk, cancel_all)) {
+ hlist_del_init(&req->hash_node);
+ io_poll_cancel_req(req);
+ found = true;
+ }
}
}
- spin_unlock_irq(&ctx->completion_lock);
-
- if (posted)
- io_cqring_ev_posted(ctx);
-
- return posted != 0;
+ spin_unlock(&ctx->completion_lock);
+ return found;
}
-static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
+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;
hlist_for_each_entry(req, list, hash_node) {
if (sqe_addr != req->user_data)
continue;
- if (io_poll_remove_one(req))
- return 0;
- return -EALREADY;
+ if (poll_only && req->opcode != IORING_OP_POLL_ADD)
+ continue;
+ return req;
}
-
- return -ENOENT;
+ return NULL;
}
-static int io_poll_remove_prep(struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static bool io_poll_disarm(struct io_kiocb *req)
+ __must_hold(&ctx->completion_lock)
{
- if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
- return -EINVAL;
- if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index ||
- sqe->poll_events)
- return -EINVAL;
-
- req->poll.addr = READ_ONCE(sqe->addr);
- return 0;
+ if (!io_poll_get_ownership(req))
+ return false;
+ io_poll_remove_entries(req);
+ hash_del(&req->hash_node);
+ return true;
}
-/*
- * Find a running poll command that matches one specified in sqe->addr,
- * and remove it if found.
- */
-static int io_poll_remove(struct io_kiocb *req)
+static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr,
+ bool poll_only)
+ __must_hold(&ctx->completion_lock)
{
- struct io_ring_ctx *ctx = req->ctx;
- u64 addr;
- int ret;
+ struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only);
- addr = req->poll.addr;
- spin_lock_irq(&ctx->completion_lock);
- ret = io_poll_cancel(ctx, addr);
- spin_unlock_irq(&ctx->completion_lock);
-
- if (ret < 0)
- req_set_fail_links(req);
- io_req_complete(req, ret);
+ if (!req)
+ return -ENOENT;
+ io_poll_cancel_req(req);
return 0;
}
-static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
- void *key)
+static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe,
+ unsigned int flags)
{
- struct io_kiocb *req = wait->private;
- struct io_poll_iocb *poll = &req->poll;
+ u32 events;
- return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func);
+ 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 void io_poll_queue_proc(struct file *file, struct wait_queue_head *head,
- struct poll_table_struct *p)
+static int io_poll_update_prep(struct io_kiocb *req,
+ const struct io_uring_sqe *sqe)
{
- struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
+ 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;
- __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data);
+ 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 events;
+ u32 flags;
if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
return -EINVAL;
- if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index)
+ 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;
- events = READ_ONCE(sqe->poll32_events);
-#ifdef __BIG_ENDIAN
- events = swahw32(events);
-#endif
- poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP |
- (events & EPOLLEXCLUSIVE);
+ io_req_set_refcount(req);
+ poll->events = io_poll_parse_events(sqe, flags);
return 0;
}
-static int io_poll_add(struct io_kiocb *req)
+static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_poll_iocb *poll = &req->poll;
- struct io_ring_ctx *ctx = req->ctx;
struct io_poll_table ipt;
- __poll_t mask;
+ int ret;
ipt.pt._qproc = io_poll_queue_proc;
- mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events,
- io_poll_wake);
+ 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;
+}
- if (mask) { /* no async, we'd stolen it */
- ipt.error = 0;
- io_poll_complete(req, mask, 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_irq(&ctx->completion_lock);
+ spin_unlock(&ctx->completion_lock);
- if (mask) {
- io_cqring_ev_posted(ctx);
- io_put_req(req);
+ 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;
}
- return ipt.error;
+ 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_ring_ctx *ctx = req->ctx;
unsigned long flags;
- spin_lock_irqsave(&ctx->completion_lock, 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);
- io_cqring_fill_event(req, -ETIME);
- io_commit_cqring(ctx);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
- io_cqring_ev_posted(ctx);
- req_set_fail_links(req);
- io_put_req(req);
+ req->io_task_work.func = io_req_task_timeout;
+ io_req_task_work_add(req);
return HRTIMER_NORESTART;
}
-static int __io_timeout_cancel(struct io_kiocb *req)
+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 = req->async_data;
- int ret;
+ struct io_timeout_data *io;
+ struct io_kiocb *req;
+ bool found = false;
- ret = hrtimer_try_to_cancel(&io->timer);
- if (ret == -1)
- return -EALREADY;
+ 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);
- req_set_fail_links(req);
- io_cqring_fill_event(req, -ECANCELED);
- io_put_req_deferred(req, 1);
+ 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 int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
+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;
- int ret = -ENOENT;
+ bool found = false;
- list_for_each_entry(req, &ctx->timeout_list, timeout.list) {
- if (user_data == req->user_data) {
- ret = 0;
+ list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) {
+ found = user_data == req->user_data;
+ if (found)
break;
- }
}
+ if (!found)
+ return -ENOENT;
- if (ret == -ENOENT)
- return ret;
+ 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;
+}
- return __io_timeout_cancel(req);
+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->timeout_flags ||
- sqe->splice_fd_in)
+ 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;
+ }
- req->timeout_rem.addr = READ_ONCE(sqe->addr);
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)
+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;
- spin_lock_irq(&ctx->completion_lock);
- ret = io_timeout_cancel(ctx, req->timeout_rem.addr);
+ 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);
+ }
- io_cqring_fill_event(req, ret);
- io_commit_cqring(ctx);
- spin_unlock_irq(&ctx->completion_lock);
- io_cqring_ev_posted(ctx);
if (ret < 0)
- req_set_fail_links(req);
- io_put_req(req);
+ req_set_fail(req);
+ io_req_complete_post(req, ret, 0);
return 0;
}
if (off && is_timeout_link)
return -EINVAL;
flags = READ_ONCE(sqe->timeout_flags);
- if (flags & ~IORING_TIMEOUT_ABS)
+ 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;
- if (flags & IORING_TIMEOUT_ABS)
- data->mode = HRTIMER_MODE_ABS;
- else
- data->mode = HRTIMER_MODE_REL;
-
INIT_LIST_HEAD(&req->timeout.list);
- hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode);
+ 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)
+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->completion_lock);
+ spin_lock_irq(&ctx->timeout_lock);
/*
* sqe->off holds how many events that need to occur for this
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->completion_lock);
+ 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->user_data == (unsigned long) data;
+ return req->ctx == cd->ctx && req->user_data == cd->user_data;
}
-static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr)
+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;
- cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false);
+ 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;
return ret;
}
-static void io_async_find_and_cancel(struct io_ring_ctx *ctx,
- struct io_kiocb *req, __u64 sqe_addr,
- int success_ret)
+static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr)
{
- unsigned long flags;
+ struct io_ring_ctx *ctx = req->ctx;
int ret;
- ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr);
- if (ret != -ENOENT) {
- spin_lock_irqsave(&ctx->completion_lock, flags);
- goto done;
- }
+ WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
- spin_lock_irqsave(&ctx->completion_lock, flags);
- ret = io_timeout_cancel(ctx, sqe_addr);
+ ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx);
if (ret != -ENOENT)
- goto done;
- ret = io_poll_cancel(ctx, sqe_addr);
-done:
- if (!ret)
- ret = success_ret;
- io_cqring_fill_event(req, ret);
- io_commit_cqring(ctx);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
- io_cqring_ev_posted(ctx);
+ return ret;
- if (ret < 0)
- req_set_fail_links(req);
- io_put_req(req);
+ 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,
return 0;
}
-static int io_async_cancel(struct io_kiocb *req)
+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;
- io_async_find_and_cancel(ctx, req, req->cancel.addr, 0);
+ 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_files_update_prep(struct io_kiocb *req,
+static int io_rsrc_update_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
- if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL))
- return -EINVAL;
if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
return -EINVAL;
- if (sqe->ioprio || sqe->rw_flags)
+ if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in)
return -EINVAL;
- req->files_update.offset = READ_ONCE(sqe->off);
- req->files_update.nr_args = READ_ONCE(sqe->len);
- if (!req->files_update.nr_args)
+ 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->files_update.arg = READ_ONCE(sqe->addr);
+ req->rsrc_update.arg = READ_ONCE(sqe->addr);
return 0;
}
-static int io_files_update(struct io_kiocb *req, bool force_nonblock,
- struct io_comp_state *cs)
+static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *ctx = req->ctx;
- struct io_uring_files_update up;
+ struct io_uring_rsrc_update2 up;
int ret;
- if (force_nonblock)
- return -EAGAIN;
-
- up.offset = req->files_update.offset;
- up.fds = req->files_update.arg;
+ up.offset = req->rsrc_update.offset;
+ up.data = req->rsrc_update.arg;
+ up.nr = 0;
+ up.tags = 0;
+ up.resv = 0;
+ up.resv2 = 0;
- mutex_lock(&ctx->uring_lock);
- ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args);
- mutex_unlock(&ctx->uring_lock);
+ 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_links(req);
- __io_req_complete(req, ret, 0, cs);
+ req_set_fail(req);
+ __io_req_complete(req, issue_flags, ret, 0);
return 0;
}
case IORING_OP_POLL_ADD:
return io_poll_add_prep(req, sqe);
case IORING_OP_POLL_REMOVE:
- return io_poll_remove_prep(req, sqe);
+ return io_poll_update_prep(req, sqe);
case IORING_OP_FSYNC:
- return io_prep_fsync(req, sqe);
+ return io_fsync_prep(req, sqe);
case IORING_OP_SYNC_FILE_RANGE:
- return io_prep_sfr(req, sqe);
+ return io_sfr_prep(req, sqe);
case IORING_OP_SENDMSG:
case IORING_OP_SEND:
return io_sendmsg_prep(req, sqe);
case IORING_OP_CLOSE:
return io_close_prep(req, sqe);
case IORING_OP_FILES_UPDATE:
- return io_files_update_prep(req, sqe);
+ return io_rsrc_update_prep(req, sqe);
case IORING_OP_STATX:
return io_statx_prep(req, sqe);
case IORING_OP_FADVISE:
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);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
req->opcode);
- return-EINVAL;
+ return -EINVAL;
}
-static int io_req_defer_prep(struct io_kiocb *req,
- const struct io_uring_sqe *sqe)
+static int io_req_prep_async(struct io_kiocb *req)
{
- if (!sqe)
+ 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;
- return io_req_prep(req, sqe);
+
+ 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)
{
- struct io_kiocb *pos;
- struct io_ring_ctx *ctx = req->ctx;
- u32 total_submitted, nr_reqs = 1;
+ u32 seq = req->ctx->cached_sq_head;
- if (req->flags & REQ_F_LINK_HEAD)
- list_for_each_entry(pos, &req->link_list, link_list)
- nr_reqs++;
-
- total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped;
- return total_submitted - nr_reqs;
+ /* need original cached_sq_head, but it was increased for each req */
+ io_for_each_link(req, req)
+ seq--;
+ return seq;
}
-static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+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)))
- return 0;
+ !(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 0;
+ return false;
- if (!req->async_data) {
- ret = io_req_defer_prep(req, sqe);
- if (ret)
- return ret;
- }
+ ret = io_req_prep_async(req);
+ if (ret)
+ goto fail;
io_prep_async_link(req);
de = kmalloc(sizeof(*de), GFP_KERNEL);
- if (!de)
- return -ENOMEM;
+ if (!de) {
+ ret = -ENOMEM;
+fail:
+ io_req_complete_failed(req, ret);
+ return true;
+ }
- spin_lock_irq(&ctx->completion_lock);
+ spin_lock(&ctx->completion_lock);
if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) {
- spin_unlock_irq(&ctx->completion_lock);
+ spin_unlock(&ctx->completion_lock);
kfree(de);
- io_queue_async_work(req);
- return -EIOCBQUEUED;
+ 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_irq(&ctx->completion_lock);
- return -EIOCBQUEUED;
-}
-
-static void io_req_drop_files(struct io_kiocb *req)
-{
- struct io_ring_ctx *ctx = req->ctx;
- struct io_uring_task *tctx = req->task->io_uring;
- unsigned long flags;
-
- if (req->work.flags & IO_WQ_WORK_FILES) {
- put_files_struct(req->work.identity->files);
- put_nsproxy(req->work.identity->nsproxy);
- }
- spin_lock_irqsave(&ctx->inflight_lock, flags);
- list_del(&req->inflight_entry);
- spin_unlock_irqrestore(&ctx->inflight_lock, flags);
- req->flags &= ~REQ_F_INFLIGHT;
- req->work.flags &= ~IO_WQ_WORK_FILES;
- if (atomic_read(&tctx->in_idle))
- wake_up(&tctx->wait);
+ spin_unlock(&ctx->completion_lock);
+ return true;
}
-static void __io_clean_op(struct io_kiocb *req)
+static void io_clean_op(struct io_kiocb *req)
{
if (req->flags & REQ_F_BUFFER_SELECTED) {
switch (req->opcode) {
kfree(req->sr_msg.kbuf);
break;
}
- req->flags &= ~REQ_F_BUFFER_SELECTED;
}
if (req->flags & REQ_F_NEED_CLEANUP) {
case IORING_OP_WRITE_FIXED:
case IORING_OP_WRITE: {
struct io_async_rw *io = req->async_data;
- if (io->free_iovec)
- kfree(io->free_iovec);
+
+ kfree(io->free_iovec);
break;
}
case IORING_OP_RECVMSG:
case IORING_OP_SENDMSG: {
struct io_async_msghdr *io = req->async_data;
- if (io->iov != io->fast_iov)
- kfree(io->iov);
+
+ kfree(io->free_iov);
break;
}
- case IORING_OP_SPLICE:
- case IORING_OP_TEE:
- io_put_file(req, req->splice.file_in,
- (req->splice.flags & SPLICE_F_FD_IN_FIXED));
- 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;
}
- req->flags &= ~REQ_F_NEED_CLEANUP;
}
+ 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, bool force_nonblock,
- struct io_comp_state *cs)
+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, cs);
+ ret = io_nop(req, issue_flags);
break;
case IORING_OP_READV:
case IORING_OP_READ_FIXED:
case IORING_OP_READ:
- ret = io_read(req, force_nonblock, cs);
+ ret = io_read(req, issue_flags);
break;
case IORING_OP_WRITEV:
case IORING_OP_WRITE_FIXED:
case IORING_OP_WRITE:
- ret = io_write(req, force_nonblock, cs);
+ ret = io_write(req, issue_flags);
break;
case IORING_OP_FSYNC:
- ret = io_fsync(req, force_nonblock);
+ ret = io_fsync(req, issue_flags);
break;
case IORING_OP_POLL_ADD:
- ret = io_poll_add(req);
+ ret = io_poll_add(req, issue_flags);
break;
case IORING_OP_POLL_REMOVE:
- ret = io_poll_remove(req);
+ ret = io_poll_update(req, issue_flags);
break;
case IORING_OP_SYNC_FILE_RANGE:
- ret = io_sync_file_range(req, force_nonblock);
+ ret = io_sync_file_range(req, issue_flags);
break;
case IORING_OP_SENDMSG:
- ret = io_sendmsg(req, force_nonblock, cs);
+ ret = io_sendmsg(req, issue_flags);
break;
case IORING_OP_SEND:
- ret = io_send(req, force_nonblock, cs);
+ ret = io_send(req, issue_flags);
break;
case IORING_OP_RECVMSG:
- ret = io_recvmsg(req, force_nonblock, cs);
+ ret = io_recvmsg(req, issue_flags);
break;
case IORING_OP_RECV:
- ret = io_recv(req, force_nonblock, cs);
+ ret = io_recv(req, issue_flags);
break;
case IORING_OP_TIMEOUT:
- ret = io_timeout(req);
+ ret = io_timeout(req, issue_flags);
break;
case IORING_OP_TIMEOUT_REMOVE:
- ret = io_timeout_remove(req);
+ ret = io_timeout_remove(req, issue_flags);
break;
case IORING_OP_ACCEPT:
- ret = io_accept(req, force_nonblock, cs);
+ ret = io_accept(req, issue_flags);
break;
case IORING_OP_CONNECT:
- ret = io_connect(req, force_nonblock, cs);
+ ret = io_connect(req, issue_flags);
break;
case IORING_OP_ASYNC_CANCEL:
- ret = io_async_cancel(req);
+ ret = io_async_cancel(req, issue_flags);
break;
case IORING_OP_FALLOCATE:
- ret = io_fallocate(req, force_nonblock);
+ ret = io_fallocate(req, issue_flags);
break;
case IORING_OP_OPENAT:
- ret = io_openat(req, force_nonblock);
+ ret = io_openat(req, issue_flags);
break;
case IORING_OP_CLOSE:
- ret = io_close(req, force_nonblock, cs);
+ ret = io_close(req, issue_flags);
break;
case IORING_OP_FILES_UPDATE:
- ret = io_files_update(req, force_nonblock, cs);
+ ret = io_files_update(req, issue_flags);
break;
case IORING_OP_STATX:
- ret = io_statx(req, force_nonblock);
+ ret = io_statx(req, issue_flags);
break;
case IORING_OP_FADVISE:
- ret = io_fadvise(req, force_nonblock);
+ ret = io_fadvise(req, issue_flags);
break;
case IORING_OP_MADVISE:
- ret = io_madvise(req, force_nonblock);
+ ret = io_madvise(req, issue_flags);
break;
case IORING_OP_OPENAT2:
- ret = io_openat2(req, force_nonblock);
+ ret = io_openat2(req, issue_flags);
break;
case IORING_OP_EPOLL_CTL:
- ret = io_epoll_ctl(req, force_nonblock, cs);
+ ret = io_epoll_ctl(req, issue_flags);
break;
case IORING_OP_SPLICE:
- ret = io_splice(req, force_nonblock);
+ ret = io_splice(req, issue_flags);
break;
case IORING_OP_PROVIDE_BUFFERS:
- ret = io_provide_buffers(req, force_nonblock, cs);
+ ret = io_provide_buffers(req, issue_flags);
break;
case IORING_OP_REMOVE_BUFFERS:
- ret = io_remove_buffers(req, force_nonblock, cs);
+ ret = io_remove_buffers(req, issue_flags);
break;
case IORING_OP_TEE:
- ret = io_tee(req, force_nonblock);
+ 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;
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) {
- const bool in_async = io_wq_current_is_worker();
-
- /* workqueue context doesn't hold uring_lock, grab it now */
- if (in_async)
- mutex_lock(&ctx->uring_lock);
-
+ if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file)
io_iopoll_req_issued(req);
- if (in_async)
- mutex_unlock(&ctx->uring_lock);
- }
-
return 0;
}
-static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work)
+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);
- /* if NO_CANCEL is set, we must still run the work */
- if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) ==
- IO_WQ_WORK_CANCEL) {
+ /* 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, false, NULL);
+ 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)
+ if (ret != -EAGAIN || !(req->ctx->flags & IORING_SETUP_IOPOLL))
break;
cond_resched();
} while (1);
}
- if (ret) {
- struct io_ring_ctx *lock_ctx = NULL;
-
- if (req->ctx->flags & IORING_SETUP_IOPOLL)
- lock_ctx = req->ctx;
-
- /*
- * io_iopoll_complete() does not hold completion_lock to
- * complete polled io, so here for polled io, we can not call
- * io_req_complete() directly, otherwise there maybe concurrent
- * access to cqring, defer_list, etc, which is not safe. Given
- * that io_iopoll_complete() is always called under uring_lock,
- * so here for polled io, we also get uring_lock to complete
- * it.
- */
- if (lock_ctx)
- mutex_lock(&lock_ctx->uring_lock);
-
- req_set_fail_links(req);
- io_req_complete(req, ret);
-
- if (lock_ctx)
- mutex_unlock(&lock_ctx->uring_lock);
- }
+ /* avoid locking problems by failing it from a clean context */
+ if (ret)
+ io_req_task_queue_fail(req, ret);
+}
- return io_steal_work(req);
+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 fixed_file_table *table;
+ struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index);
- table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT];
- return table->files[index & IORING_FILE_TABLE_MASK];
+ return (struct file *) (slot->file_ptr & FFS_MASK);
}
-static struct file *io_file_get(struct io_submit_state *state,
- struct io_kiocb *req, int fd, bool fixed)
+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 io_ring_ctx *ctx = req->ctx;
struct file *file;
+ unsigned long file_ptr;
- if (fixed) {
- if (unlikely((unsigned int)fd >= ctx->nr_user_files))
- return NULL;
- fd = array_index_nospec(fd, ctx->nr_user_files);
- file = io_file_from_index(ctx, fd);
- if (file) {
- req->fixed_file_refs = &ctx->file_data->node->refs;
- percpu_ref_get(req->fixed_file_refs);
- }
- } else {
- trace_io_uring_file_get(ctx, fd);
- file = __io_file_get(state, fd);
- }
+ 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;
+}
- if (file && file->f_op == &io_uring_fops &&
- !(req->flags & REQ_F_INFLIGHT)) {
- io_req_init_async(req);
- req->flags |= REQ_F_INFLIGHT;
+static struct file *io_file_get_normal(struct io_ring_ctx *ctx,
+ struct io_kiocb *req, int fd)
+{
+ struct file *file = fget(fd);
- spin_lock_irq(&ctx->inflight_lock);
- list_add(&req->inflight_entry, &ctx->inflight_list);
- spin_unlock_irq(&ctx->inflight_lock);
- }
+ 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 int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
- int fd)
+static inline struct file *io_file_get(struct io_ring_ctx *ctx,
+ struct io_kiocb *req, int fd, bool fixed)
{
- bool fixed;
+ if (fixed)
+ return io_file_get_fixed(ctx, req, fd);
+ else
+ return io_file_get_normal(ctx, req, fd);
+}
- fixed = (req->flags & REQ_F_FIXED_FILE) != 0;
- if (unlikely(!fixed && io_async_submit(req->ctx)))
- return -EBADF;
+static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked)
+{
+ struct io_kiocb *prev = req->timeout.prev;
+ int ret = -ENOENT;
- req->file = io_file_get(state, req, fd, fixed);
- if (req->file || io_op_defs[req->opcode].needs_file_no_error)
- return 0;
- return -EBADF;
+ 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 *req = data->req;
+ struct io_kiocb *prev, *req = data->req;
struct io_ring_ctx *ctx = req->ctx;
- struct io_kiocb *prev = NULL;
unsigned long flags;
- spin_lock_irqsave(&ctx->completion_lock, 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 (!list_empty(&req->link_list)) {
- prev = list_entry(req->link_list.prev, struct io_kiocb,
- link_list);
- list_del_init(&req->link_list);
- if (!refcount_inc_not_zero(&prev->refs))
+ if (prev) {
+ io_remove_next_linked(prev);
+ if (!req_ref_inc_not_zero(prev))
prev = NULL;
}
-
list_del(&req->timeout.list);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
+ req->timeout.prev = prev;
+ spin_unlock_irqrestore(&ctx->timeout_lock, flags);
- if (prev) {
- io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME);
- io_put_req_deferred(prev, 1);
- } else {
- io_cqring_add_event(req, -ETIME, 0);
- io_put_req_deferred(req, 1);
- }
+ 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)
+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 list is now empty, then our linked request finished before
- * we got a chance to setup the timer
+ * If the back reference is NULL, then our linked request finished
+ * before we got a chance to setup the timer
*/
- if (!list_empty(&req->link_list)) {
+ 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);
}
-}
-
-static void io_queue_linked_timeout(struct io_kiocb *req)
-{
- struct io_ring_ctx *ctx = req->ctx;
-
- spin_lock_irq(&ctx->completion_lock);
- __io_queue_linked_timeout(req);
- spin_unlock_irq(&ctx->completion_lock);
-
+ spin_unlock_irq(&ctx->timeout_lock);
/* drop submission reference */
io_put_req(req);
}
-static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
-{
- struct io_kiocb *nxt;
-
- if (!(req->flags & REQ_F_LINK_HEAD))
- return NULL;
- if (req->flags & REQ_F_LINK_TIMEOUT)
- return NULL;
-
- nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb,
- link_list);
- if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT)
- return NULL;
-
- nxt->flags |= REQ_F_LTIMEOUT_ACTIVE;
- req->flags |= REQ_F_LINK_TIMEOUT;
- return nxt;
-}
-
-static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
+static void __io_queue_sqe(struct io_kiocb *req)
+ __must_hold(&req->ctx->uring_lock)
{
struct io_kiocb *linked_timeout;
- const struct cred *old_creds = NULL;
int ret;
-again:
- linked_timeout = io_prep_linked_timeout(req);
-
- if ((req->flags & REQ_F_WORK_INITIALIZED) &&
- (req->work.flags & IO_WQ_WORK_CREDS) &&
- req->work.identity->creds != current_cred()) {
- if (old_creds)
- revert_creds(old_creds);
- if (old_creds == req->work.identity->creds)
- old_creds = NULL; /* restored original creds */
- else
- old_creds = override_creds(req->work.identity->creds);
- }
-
- ret = io_issue_sqe(req, true, cs);
+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 (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
- if (!io_arm_poll_handler(req)) {
+ 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);
+ io_queue_async_work(req, NULL);
+ break;
}
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
- } else if (likely(!ret)) {
- /* drop submission reference */
- req = io_put_req_find_next(req);
- if (linked_timeout)
- io_queue_linked_timeout(linked_timeout);
-
- if (req) {
- if (!(req->flags & REQ_F_FORCE_ASYNC))
- goto again;
- io_queue_async_work(req);
- }
} else {
- /* un-prep timeout, so it'll be killed as any other linked */
- req->flags &= ~REQ_F_LINK_TIMEOUT;
- req_set_fail_links(req);
- io_put_req(req);
- io_req_complete(req, ret);
+ io_req_complete_failed(req, ret);
}
-
- if (old_creds)
- revert_creds(old_creds);
}
-static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_comp_state *cs)
+static inline void io_queue_sqe(struct io_kiocb *req)
+ __must_hold(&req->ctx->uring_lock)
{
- int ret;
+ if (unlikely(req->ctx->drain_active) && io_drain_req(req))
+ return;
- ret = io_req_defer(req, sqe);
- if (ret) {
- if (ret != -EIOCBQUEUED) {
-fail_req:
- req_set_fail_links(req);
- io_put_req(req);
- io_req_complete(req, ret);
- }
- } else if (req->flags & REQ_F_FORCE_ASYNC) {
- if (!req->async_data) {
- ret = io_req_defer_prep(req, sqe);
- if (unlikely(ret))
- goto fail_req;
- }
- io_queue_async_work(req);
+ 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 {
- if (sqe) {
- ret = io_req_prep(req, sqe);
- if (unlikely(ret))
- goto fail_req;
- }
- __io_queue_sqe(req, cs);
+ int ret = io_req_prep_async(req);
+
+ if (unlikely(ret))
+ io_req_complete_failed(req, ret);
+ else
+ io_queue_async_work(req, NULL);
}
}
-static inline void io_queue_link_head(struct io_kiocb *req,
- struct io_comp_state *cs)
+/*
+ * 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 (unlikely(req->flags & REQ_F_FAIL_LINK)) {
- io_put_req(req);
- io_req_complete(req, -ECANCELED);
- } else
- io_queue_sqe(req, NULL, cs);
-}
+ if (likely(!ctx->restricted))
+ return true;
-static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
- struct io_kiocb **link, struct io_comp_state *cs)
-{
- struct io_ring_ctx *ctx = req->ctx;
- int ret;
+ if (!test_bit(req->opcode, ctx->restrictions.sqe_op))
+ return false;
- /*
- * 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) {
- struct io_kiocb *head = *link;
+ if ((sqe_flags & ctx->restrictions.sqe_flags_required) !=
+ ctx->restrictions.sqe_flags_required)
+ return false;
- /*
- * Taking sequential execution of a link, draining both sides
- * of the link also fullfils IOSQE_IO_DRAIN semantics for all
- * requests in the link. So, it drains the head and the
- * next after the link request. The last one is done via
- * drain_next flag to persist the effect across calls.
- */
- if (req->flags & REQ_F_IO_DRAIN) {
- head->flags |= REQ_F_IO_DRAIN;
- ctx->drain_next = 1;
- }
- ret = io_req_defer_prep(req, sqe);
- if (unlikely(ret)) {
- /* fail even hard links since we don't submit */
- head->flags |= REQ_F_FAIL_LINK;
- return ret;
- }
- trace_io_uring_link(ctx, req, head);
- list_add_tail(&req->link_list, &head->link_list);
+ if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed |
+ ctx->restrictions.sqe_flags_required))
+ return false;
- /* last request of a link, enqueue the link */
- if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
- io_queue_link_head(head, cs);
- *link = NULL;
+ 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 {
- if (unlikely(ctx->drain_next)) {
- req->flags |= REQ_F_IO_DRAIN;
- ctx->drain_next = 0;
+ 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);
+ }
}
- if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
- req->flags |= REQ_F_LINK_HEAD;
- INIT_LIST_HEAD(&req->link_list);
+ trace_io_uring_link(ctx, req, head);
+ link->last->link = req;
+ link->last = req;
- ret = io_req_defer_prep(req, sqe);
- if (unlikely(ret))
- req->flags |= REQ_F_FAIL_LINK;
- *link = 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, sqe, cs);
+ io_queue_sqe(req);
}
}
/*
* Batched submission is done, ensure local IO is flushed out.
*/
-static void io_submit_state_end(struct io_submit_state *state)
+static void io_submit_state_end(struct io_submit_state *state,
+ struct io_ring_ctx *ctx)
{
- if (!list_empty(&state->comp.list))
- io_submit_flush_completions(&state->comp);
- blk_finish_plug(&state->plug);
- io_state_file_put(state);
- if (state->free_reqs)
- kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);
+ 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,
- struct io_ring_ctx *ctx, unsigned int max_ios)
-{
- blk_start_plug(&state->plug);
- state->comp.nr = 0;
- INIT_LIST_HEAD(&state->comp.list);
- state->comp.ctx = ctx;
- state->free_reqs = 0;
- state->file = NULL;
+ 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)
}
/*
- * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory
+ * 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
*/
static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
{
- u32 *sq_array = ctx->sq_array;
- unsigned head;
+ 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:
* 2) allows the kernel side to track the head on its own, even
* though the application is the one updating it.
*/
- head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]);
+ head = READ_ONCE(ctx->sq_array[sq_idx]);
if (likely(head < ctx->sq_entries))
return &ctx->sq_sqes[head];
/* drop invalid entries */
- ctx->cached_sq_dropped++;
- WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped);
+ ctx->cq_extra--;
+ WRITE_ONCE(ctx->rings->sq_dropped,
+ READ_ONCE(ctx->rings->sq_dropped) + 1);
return NULL;
}
-static inline void io_consume_sqe(struct io_ring_ctx *ctx)
-{
- ctx->cached_sq_head++;
-}
-
-/*
- * 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 (!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;
-}
-
-#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
- IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
- IOSQE_BUFFER_SELECT)
-
-static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
- const struct io_uring_sqe *sqe,
- struct io_submit_state *state)
-{
- unsigned int sqe_flags;
- int id, ret;
-
- req->opcode = READ_ONCE(sqe->opcode);
- req->user_data = READ_ONCE(sqe->user_data);
- req->async_data = NULL;
- req->file = NULL;
- req->ctx = ctx;
- req->flags = 0;
- /* one is dropped after submission, the other at completion */
- refcount_set(&req->refs, 2);
- req->task = current;
- req->result = 0;
-
- if (unlikely(req->opcode >= IORING_OP_LAST))
- return -EINVAL;
-
- if (unlikely(io_sq_thread_acquire_mm(ctx, req)))
- return -EFAULT;
-
- sqe_flags = READ_ONCE(sqe->flags);
- /* enforce forwards compatibility on users */
- if (unlikely(sqe_flags & ~SQE_VALID_FLAGS))
- return -EINVAL;
-
- if (unlikely(!io_check_restriction(ctx, req, sqe_flags)))
- return -EACCES;
-
- if ((sqe_flags & IOSQE_BUFFER_SELECT) &&
- !io_op_defs[req->opcode].buffer_select)
- return -EOPNOTSUPP;
-
- id = READ_ONCE(sqe->personality);
- if (id) {
- struct io_identity *iod;
-
- iod = xa_load(&ctx->personalities, id);
- if (unlikely(!iod))
- return -EINVAL;
- refcount_inc(&iod->count);
-
- __io_req_init_async(req);
- get_cred(iod->creds);
- req->work.identity = iod;
- req->work.flags |= IO_WQ_WORK_CREDS;
- }
-
- /* same numerical values with corresponding REQ_F_*, safe to copy */
- req->flags |= sqe_flags;
-
- if (!io_op_defs[req->opcode].needs_file)
- return 0;
-
- ret = io_req_set_file(state, req, READ_ONCE(sqe->fd));
- state->ios_left--;
- return ret;
-}
-
static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
+ __must_hold(&ctx->uring_lock)
{
- struct io_submit_state state;
- struct io_kiocb *link = NULL;
- int i, submitted = 0;
-
- /* if we have a backlog and couldn't flush it all, return BUSY */
- if (test_bit(0, &ctx->sq_check_overflow)) {
- if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL))
- return -EBUSY;
- }
+ 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);
- percpu_counter_add(¤t->io_uring->inflight, nr);
- refcount_add(nr, ¤t->usage);
-
- io_submit_state_start(&state, ctx, nr);
-
- for (i = 0; i < nr; i++) {
+ io_submit_state_start(&ctx->submit_state, nr);
+ while (submitted < nr) {
const struct io_uring_sqe *sqe;
struct io_kiocb *req;
- int err;
- sqe = io_get_sqe(ctx);
- if (unlikely(!sqe)) {
- io_consume_sqe(ctx);
- break;
- }
- req = io_alloc_req(ctx, &state);
+ req = io_alloc_req(ctx);
if (unlikely(!req)) {
if (!submitted)
submitted = -EAGAIN;
break;
}
- io_consume_sqe(ctx);
+ 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++;
-
- err = io_init_req(ctx, req, sqe, &state);
- if (unlikely(err)) {
-fail_req:
- io_put_req(req);
- io_req_complete(req, err);
+ if (io_submit_sqe(ctx, req, sqe))
break;
- }
-
- trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
- true, io_async_submit(ctx));
- err = io_submit_sqe(req, sqe, &link, &state.comp);
- if (err)
- goto fail_req;
}
if (unlikely(submitted != nr)) {
int ref_used = (submitted == -EAGAIN) ? 0 : submitted;
- struct io_uring_task *tctx = current->io_uring;
int unused = nr - ref_used;
+ current->io_uring->cached_refs += unused;
percpu_ref_put_many(&ctx->refs, unused);
- percpu_counter_sub(&tctx->inflight, unused);
- put_task_struct_many(current, unused);
}
- if (link)
- io_queue_link_head(link, &state.comp);
- io_submit_state_end(&state);
+ 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 void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx)
+static inline bool io_sqd_events_pending(struct io_sq_data *sqd)
{
- /* Tell userspace we may need a wakeup call */
- spin_lock_irq(&ctx->completion_lock);
- ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP;
- spin_unlock_irq(&ctx->completion_lock);
+ return READ_ONCE(sqd->state);
}
-static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx)
+static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx)
{
- spin_lock_irq(&ctx->completion_lock);
- ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP;
- spin_unlock_irq(&ctx->completion_lock);
+ /* 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 int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode,
- int sync, void *key)
+static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx)
{
- struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry);
- int ret;
-
- ret = autoremove_wake_function(wqe, mode, sync, key);
- if (ret) {
- unsigned long flags;
-
- spin_lock_irqsave(&ctx->completion_lock, flags);
- ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP;
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
- }
- return ret;
+ spin_lock(&ctx->completion_lock);
+ WRITE_ONCE(ctx->rings->sq_flags,
+ ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP);
+ spin_unlock(&ctx->completion_lock);
}
-enum sq_ret {
- SQT_IDLE = 1,
- SQT_SPIN = 2,
- SQT_DID_WORK = 4,
-};
-
-static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx,
- unsigned long start_jiffies, bool cap_entries)
+static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
{
- unsigned long timeout = start_jiffies + ctx->sq_thread_idle;
- struct io_sq_data *sqd = ctx->sq_data;
unsigned int to_submit;
int ret = 0;
-again:
- if (!list_empty(&ctx->iopoll_list)) {
- unsigned nr_events = 0;
-
- mutex_lock(&ctx->uring_lock);
- if (!list_empty(&ctx->iopoll_list) && !need_resched())
- io_do_iopoll(ctx, &nr_events, 0);
- mutex_unlock(&ctx->uring_lock);
- }
-
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 submit got -EBUSY, flag us as needing the application
- * to enter the kernel to reap and flush events.
- */
- if (!to_submit || ret == -EBUSY || need_resched()) {
- /*
- * Drop cur_mm before scheduling, we can't hold it for
- * long periods (or over schedule()). Do this before
- * adding ourselves to the waitqueue, as the unuse/drop
- * may sleep.
- */
- io_sq_thread_drop_mm();
+ if (!list_empty(&ctx->iopoll_list) || to_submit) {
+ unsigned nr_events = 0;
+ const struct cred *creds = NULL;
- /*
- * We're polling. If we're within the defined idle
- * period, then let us spin without work before going
- * to sleep. The exception is if we got EBUSY doing
- * more IO, we should wait for the application to
- * reap events and wake us up.
- */
- if (!list_empty(&ctx->iopoll_list) || need_resched() ||
- (!time_after(jiffies, timeout) && ret != -EBUSY &&
- !percpu_ref_is_dying(&ctx->refs)))
- return SQT_SPIN;
+ if (ctx->sq_creds != current_cred())
+ creds = override_creds(ctx->sq_creds);
- prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry,
- TASK_INTERRUPTIBLE);
+ mutex_lock(&ctx->uring_lock);
+ if (!list_empty(&ctx->iopoll_list))
+ io_do_iopoll(ctx, &nr_events, 0);
/*
- * While doing polled IO, before going to sleep, we need
- * to check if there are new reqs added to iopoll_list,
- * it is because reqs may have been punted to io worker
- * and will be added to iopoll_list later, hence check
- * the iopoll_list again.
+ * Don't submit if refs are dying, good for io_uring_register(),
+ * but also it is relied upon by io_ring_exit_work()
*/
- if ((ctx->flags & IORING_SETUP_IOPOLL) &&
- !list_empty_careful(&ctx->iopoll_list)) {
- finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
- goto again;
- }
+ 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);
- to_submit = io_sqring_entries(ctx);
- if (!to_submit || ret == -EBUSY)
- return SQT_IDLE;
+ if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait))
+ wake_up(&ctx->sqo_sq_wait);
+ if (creds)
+ revert_creds(creds);
}
- finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
- io_ring_clear_wakeup_flag(ctx);
-
- /* if we're handling multiple rings, cap submit size for fairness */
- if (cap_entries && to_submit > 8)
- to_submit = 8;
-
- mutex_lock(&ctx->uring_lock);
- if (likely(!percpu_ref_is_dying(&ctx->refs) && !ctx->sqo_dead))
- ret = io_submit_sqes(ctx, to_submit);
- mutex_unlock(&ctx->uring_lock);
+ return ret;
+}
- if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait))
- wake_up(&ctx->sqo_sq_wait);
+static void io_sqd_update_thread_idle(struct io_sq_data *sqd)
+{
+ struct io_ring_ctx *ctx;
+ unsigned sq_thread_idle = 0;
- return SQT_DID_WORK;
+ 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 void io_sqd_init_new(struct io_sq_data *sqd)
+static bool io_sqd_handle_event(struct io_sq_data *sqd)
{
- struct io_ring_ctx *ctx;
+ bool did_sig = false;
+ struct ksignal ksig;
- while (!list_empty(&sqd->ctx_new_list)) {
- ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list);
- init_wait(&ctx->sqo_wait_entry);
- ctx->sqo_wait_entry.func = io_sq_wake_function;
- list_move_tail(&ctx->sqd_list, &sqd->ctx_list);
- complete(&ctx->sq_thread_comp);
+ 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 cgroup_subsys_state *cur_css = NULL;
- const struct cred *old_cred = NULL;
struct io_sq_data *sqd = data;
struct io_ring_ctx *ctx;
- unsigned long start_jiffies;
+ unsigned long timeout = 0;
+ char buf[TASK_COMM_LEN];
+ DEFINE_WAIT(wait);
- start_jiffies = jiffies;
- while (!kthread_should_stop()) {
- enum sq_ret ret = 0;
- bool cap_entries;
+ snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid);
+ set_task_comm(current, buf);
- /*
- * Any changes to the sqd lists are synchronized through the
- * kthread parking. This synchronizes the thread vs users,
- * the users are synchronized on the sqd->ctx_lock.
- */
- if (kthread_should_park()) {
- kthread_parkme();
- /*
- * When sq thread is unparked, in case the previous park operation
- * comes from io_put_sq_data(), which means that sq thread is going
- * to be stopped, so here needs to have a check.
- */
- if (kthread_should_stop())
+ 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;
}
- if (unlikely(!list_empty(&sqd->ctx_new_list)))
- io_sqd_init_new(sqd);
-
cap_entries = !list_is_singular(&sqd->ctx_list);
-
list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
- if (current->cred != ctx->creds) {
- if (old_cred)
- revert_creds(old_cred);
- old_cred = override_creds(ctx->creds);
- }
- io_sq_thread_associate_blkcg(ctx, &cur_css);
-#ifdef CONFIG_AUDIT
- current->loginuid = ctx->loginuid;
- current->sessionid = ctx->sessionid;
-#endif
+ int ret = __io_sq_thread(ctx, cap_entries);
- ret |= __io_sq_thread(ctx, start_jiffies, cap_entries);
-
- io_sq_thread_drop_mm();
+ if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list)))
+ sqt_spin = true;
}
+ if (io_run_task_work())
+ sqt_spin = true;
- if (ret & SQT_SPIN) {
- io_run_task_work();
- io_sq_thread_drop_mm();
+ if (sqt_spin || !time_after(jiffies, timeout)) {
cond_resched();
- } else if (ret == SQT_IDLE) {
- if (kthread_should_park())
- continue;
- list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
+ 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);
- schedule();
- start_jiffies = jiffies;
+
+ 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();
- io_sq_thread_drop_mm();
-
- if (cur_css)
- io_sq_thread_unassociate_blkcg();
- if (old_cred)
- revert_creds(old_cred);
-
- kthread_parkme();
+ mutex_unlock(&sqd->lock);
- return 0;
+ complete(&sqd->exited);
+ do_exit(0);
}
struct io_wait_queue {
struct wait_queue_entry wq;
struct io_ring_ctx *ctx;
- unsigned to_wait;
+ 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 io_cqring_events(ctx) >= iowq->to_wait ||
- atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
+ return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
}
static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
* 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->cq_check_overflow))
+ if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow))
return autoremove_wake_function(curr, mode, wake_flags, key);
return -1;
}
return 1;
if (!signal_pending(current))
return 0;
- if (current->jobctl & JOBCTL_TASK_WORK) {
- spin_lock_irq(¤t->sighand->siglock);
- current->jobctl &= ~JOBCTL_TASK_WORK;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
- return 1;
- }
+ 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 io_wait_queue iowq = {
- .wq = {
- .private = current,
- .func = io_wake_function,
- .entry = LIST_HEAD_INIT(iowq.wq.entry),
- },
- .ctx = ctx,
- .to_wait = 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;
- int ret = 0;
+ ktime_t timeout = KTIME_MAX;
+ int ret;
do {
- io_cqring_overflow_flush(ctx, false, NULL, NULL);
+ 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())
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 {
- io_cqring_overflow_flush(ctx, false, NULL, NULL);
- prepare_to_wait_exclusive(&ctx->wait, &iowq.wq,
+ /* 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);
- /* make sure we run task_work before checking for signals */
- ret = io_run_task_work_sig();
- if (ret > 0) {
- finish_wait(&ctx->wait, &iowq.wq);
- continue;
+ 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;
}
- else if (ret < 0)
+ 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;
- if (io_should_wake(&iowq))
+ io_rsrc_node_switch(ctx, data);
+
+ /* kill initial ref, already quiesced if zero */
+ if (atomic_dec_and_test(&data->refs))
break;
- if (test_bit(0, &ctx->cq_check_overflow)) {
- finish_wait(&ctx->wait, &iowq.wq);
- continue;
+ 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;
}
- schedule();
- } while (1);
- finish_wait(&ctx->wait, &iowq.wq);
+ }
- restore_saved_sigmask_unless(ret == -EINTR);
+ atomic_set(&data->refs, 1);
+ init_completion(&data->done);
+ *pdata = data;
+ return 0;
+fail:
+ io_rsrc_data_free(data);
+ return ret;
+}
- return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
+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)
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 void io_file_ref_kill(struct percpu_ref *ref)
+static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
{
- struct fixed_file_data *data;
+ unsigned nr = ctx->nr_user_files;
+ int ret;
- data = container_of(ref, struct fixed_file_data, refs);
- complete(&data->done);
-}
+ if (!ctx->file_data)
+ return -ENXIO;
-static void io_sqe_files_set_node(struct fixed_file_data *file_data,
- struct fixed_file_ref_node *ref_node)
-{
- spin_lock_bh(&file_data->lock);
- file_data->node = ref_node;
- list_add_tail(&ref_node->node, &file_data->ref_list);
- spin_unlock_bh(&file_data->lock);
- percpu_ref_get(&file_data->refs);
+ /*
+ * 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_sqe_files_kill_node(struct fixed_file_data *data)
+static void io_sq_thread_unpark(struct io_sq_data *sqd)
+ __releases(&sqd->lock)
{
- struct fixed_file_ref_node *ref_node = NULL;
+ WARN_ON_ONCE(sqd->thread == current);
- spin_lock_bh(&data->lock);
- ref_node = data->node;
- spin_unlock_bh(&data->lock);
- if (ref_node)
- percpu_ref_kill(&ref_node->refs);
+ /*
+ * 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 int io_file_ref_quiesce(struct fixed_file_data *data,
- struct io_ring_ctx *ctx)
+static void io_sq_thread_park(struct io_sq_data *sqd)
+ __acquires(&sqd->lock)
{
- int ret;
- struct fixed_file_ref_node *backup_node;
-
- if (data->quiesce)
- return -ENXIO;
-
- data->quiesce = true;
- do {
- backup_node = alloc_fixed_file_ref_node(ctx);
- if (!backup_node)
- break;
-
- io_sqe_files_kill_node(data);
- percpu_ref_kill(&data->refs);
- flush_delayed_work(&ctx->file_put_work);
-
- ret = wait_for_completion_interruptible(&data->done);
- if (!ret)
- break;
-
- percpu_ref_resurrect(&data->refs);
- io_sqe_files_set_node(data, backup_node);
- backup_node = NULL;
- reinit_completion(&data->done);
- mutex_unlock(&ctx->uring_lock);
- ret = io_run_task_work_sig();
- mutex_lock(&ctx->uring_lock);
-
- if (ret < 0)
- break;
- backup_node = alloc_fixed_file_ref_node(ctx);
- ret = -ENOMEM;
- if (!backup_node)
- break;
- } while (1);
- data->quiesce = false;
+ WARN_ON_ONCE(sqd->thread == current);
- if (backup_node)
- destroy_fixed_file_ref_node(backup_node);
- return ret;
+ 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 int io_sqe_files_unregister(struct io_ring_ctx *ctx)
+static void io_sq_thread_stop(struct io_sq_data *sqd)
{
- struct fixed_file_data *data = ctx->file_data;
- unsigned nr_tables, i;
- int ret;
+ WARN_ON_ONCE(sqd->thread == current);
+ WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state));
- /*
- * percpu_ref_is_dying() is to stop parallel files unregister
- * Since we possibly drop uring lock later in this function to
- * run task work.
- */
- if (!data || percpu_ref_is_dying(&data->refs))
- return -ENXIO;
- ret = io_file_ref_quiesce(data, ctx);
- if (ret)
- return ret;
-
- __io_sqe_files_unregister(ctx);
- nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE);
- for (i = 0; i < nr_tables; i++)
- kfree(data->table[i].files);
- kfree(data->table);
- percpu_ref_exit(&data->refs);
- kfree(data);
- ctx->file_data = NULL;
- ctx->nr_user_files = 0;
- return 0;
+ 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)) {
- /*
- * The park is a bit of a work-around, without it we get
- * warning spews on shutdown with SQPOLL set and affinity
- * set to a single CPU.
- */
- if (sqd->thread) {
- kthread_park(sqd->thread);
- kthread_stop(sqd->thread);
- }
+ 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;
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)
+static struct io_sq_data *io_get_sq_data(struct io_uring_params *p,
+ bool *attached)
{
struct io_sq_data *sqd;
- if (p->flags & IORING_SETUP_ATTACH_WQ)
- return io_attach_sq_data(p);
+ *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);
- INIT_LIST_HEAD(&sqd->ctx_new_list);
- mutex_init(&sqd->ctx_lock);
mutex_init(&sqd->lock);
init_waitqueue_head(&sqd->wait);
+ init_completion(&sqd->exited);
return sqd;
}
-static void io_sq_thread_unpark(struct io_sq_data *sqd)
- __releases(&sqd->lock)
-{
- if (!sqd->thread)
- return;
- kthread_unpark(sqd->thread);
- mutex_unlock(&sqd->lock);
-}
-
-static void io_sq_thread_park(struct io_sq_data *sqd)
- __acquires(&sqd->lock)
-{
- if (!sqd->thread)
- return;
- mutex_lock(&sqd->lock);
- kthread_park(sqd->thread);
-}
-
-static void io_sq_thread_stop(struct io_ring_ctx *ctx)
-{
- struct io_sq_data *sqd = ctx->sq_data;
-
- if (sqd) {
- if (sqd->thread) {
- /*
- * We may arrive here from the error branch in
- * io_sq_offload_create() where the kthread is created
- * without being waked up, thus wake it up now to make
- * sure the wait will complete.
- */
- wake_up_process(sqd->thread);
- wait_for_completion(&ctx->sq_thread_comp);
-
- io_sq_thread_park(sqd);
- }
-
- mutex_lock(&sqd->ctx_lock);
- list_del(&ctx->sqd_list);
- mutex_unlock(&sqd->ctx_lock);
-
- if (sqd->thread) {
- finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
- io_sq_thread_unpark(sqd);
- }
-
- io_put_sq_data(sqd);
- ctx->sq_data = NULL;
- }
-}
-
-static void io_finish_async(struct io_ring_ctx *ctx)
-{
- io_sq_thread_stop(ctx);
-
- if (ctx->io_wq) {
- io_wq_destroy(ctx->io_wq);
- ctx->io_wq = NULL;
- }
-}
-
#if defined(CONFIG_UNIX)
/*
* Ensure the UNIX gc is aware of our file set, so we are certain that
skb->scm_io_uring = 1;
nr_files = 0;
- fpl->user = get_uid(ctx->user);
+ fpl->user = get_uid(current_user());
for (i = 0; i < nr; i++) {
struct file *file = io_file_from_index(ctx, i + offset);
}
#endif
-static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data,
- unsigned nr_tables, unsigned nr_files)
-{
- int i;
-
- for (i = 0; i < nr_tables; i++) {
- struct fixed_file_table *table = &file_data->table[i];
- unsigned this_files;
-
- this_files = min(nr_files, IORING_MAX_FILES_TABLE);
- table->files = kcalloc(this_files, sizeof(struct file *),
- GFP_KERNEL_ACCOUNT);
- if (!table->files)
- break;
- nr_files -= this_files;
- }
-
- if (i == nr_tables)
- return 0;
-
- for (i = 0; i < nr_tables; i++) {
- struct fixed_file_table *table = &file_data->table[i];
- kfree(table->files);
- }
- return 1;
-}
-
-static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file)
+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;
#endif
}
-struct io_file_put {
- struct list_head list;
- struct file *file;
-};
-
-static void __io_file_put_work(struct fixed_file_ref_node *ref_node)
+static void __io_rsrc_put_work(struct io_rsrc_node *ref_node)
{
- struct fixed_file_data *file_data = ref_node->file_data;
- struct io_ring_ctx *ctx = file_data->ctx;
- struct io_file_put *pfile, *tmp;
+ 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;
- list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) {
- list_del(&pfile->list);
- io_ring_file_put(ctx, pfile->file);
- kfree(pfile);
+ 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);
}
- percpu_ref_exit(&ref_node->refs);
- kfree(ref_node);
- percpu_ref_put(&file_data->refs);
+ io_rsrc_node_destroy(ref_node);
+ if (atomic_dec_and_test(&rsrc_data->refs))
+ complete(&rsrc_data->done);
}
-static void io_file_put_work(struct work_struct *work)
+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, file_put_work.work);
- node = llist_del_all(&ctx->file_put_llist);
+ ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work);
+ node = llist_del_all(&ctx->rsrc_put_llist);
while (node) {
- struct fixed_file_ref_node *ref_node;
+ struct io_rsrc_node *ref_node;
struct llist_node *next = node->next;
- ref_node = llist_entry(node, struct fixed_file_ref_node, llist);
- __io_file_put_work(ref_node);
+ ref_node = llist_entry(node, struct io_rsrc_node, llist);
+ __io_rsrc_put_work(ref_node);
node = next;
}
}
-static void io_file_data_ref_zero(struct percpu_ref *ref)
-{
- struct fixed_file_ref_node *ref_node;
- struct fixed_file_data *data;
- struct io_ring_ctx *ctx;
- bool first_add = false;
- int delay = HZ;
-
- ref_node = container_of(ref, struct fixed_file_ref_node, refs);
- data = ref_node->file_data;
- ctx = data->ctx;
-
- spin_lock_bh(&data->lock);
- ref_node->done = true;
-
- while (!list_empty(&data->ref_list)) {
- ref_node = list_first_entry(&data->ref_list,
- struct fixed_file_ref_node, node);
- /* recycle ref nodes in order */
- if (!ref_node->done)
- break;
- list_del(&ref_node->node);
- first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist);
- }
- spin_unlock_bh(&data->lock);
-
- if (percpu_ref_is_dying(&data->refs))
- delay = 0;
-
- if (!delay)
- mod_delayed_work(system_wq, &ctx->file_put_work, 0);
- else if (first_add)
- queue_delayed_work(system_wq, &ctx->file_put_work, delay);
-}
-
-static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
- struct io_ring_ctx *ctx)
-{
- struct fixed_file_ref_node *ref_node;
-
- ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
- if (!ref_node)
- return NULL;
-
- if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero,
- 0, GFP_KERNEL)) {
- kfree(ref_node);
- return NULL;
- }
- INIT_LIST_HEAD(&ref_node->node);
- INIT_LIST_HEAD(&ref_node->file_list);
- ref_node->file_data = ctx->file_data;
- ref_node->done = false;
- return ref_node;
-}
-
-static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node)
-{
- percpu_ref_exit(&ref_node->refs);
- kfree(ref_node);
-}
-
static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
- unsigned nr_args)
+ unsigned nr_args, u64 __user *tags)
{
__s32 __user *fds = (__s32 __user *) arg;
- unsigned nr_tables, i;
struct file *file;
- int fd, ret = -ENOMEM;
- struct fixed_file_ref_node *ref_node;
- struct fixed_file_data *file_data;
+ int fd, ret;
+ unsigned i;
if (ctx->file_data)
return -EBUSY;
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;
- file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL_ACCOUNT);
- if (!file_data)
- return -ENOMEM;
- file_data->ctx = ctx;
- init_completion(&file_data->done);
- INIT_LIST_HEAD(&file_data->ref_list);
- spin_lock_init(&file_data->lock);
-
- nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
- file_data->table = kcalloc(nr_tables, sizeof(*file_data->table),
- GFP_KERNEL_ACCOUNT);
- if (!file_data->table)
- goto out_free;
-
- if (percpu_ref_init(&file_data->refs, io_file_ref_kill,
- PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
+ ret = -ENOMEM;
+ if (!io_alloc_file_tables(&ctx->file_table, nr_args))
goto out_free;
- if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args))
- goto out_ref;
- ctx->file_data = file_data;
-
for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
- struct fixed_file_table *table;
- unsigned index;
-
if (copy_from_user(&fd, &fds[i], sizeof(fd))) {
ret = -EFAULT;
goto out_fput;
}
/* allow sparse sets */
- if (fd == -1)
+ 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 (!file)
+ if (unlikely(!file))
goto out_fput;
/*
fput(file);
goto out_fput;
}
- table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT];
- index = i & IORING_FILE_TABLE_MASK;
- table->files[index] = file;
+ 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);
+ __io_sqe_files_unregister(ctx);
return ret;
}
- ref_node = alloc_fixed_file_ref_node(ctx);
- if (!ref_node) {
- io_sqe_files_unregister(ctx);
- return -ENOMEM;
- }
-
- io_sqe_files_set_node(file_data, ref_node);
+ io_rsrc_node_switch(ctx, NULL);
return ret;
out_fput:
for (i = 0; i < ctx->nr_user_files; i++) {
if (file)
fput(file);
}
- for (i = 0; i < nr_tables; i++)
- kfree(file_data->table[i].files);
+ io_free_file_tables(&ctx->file_table);
ctx->nr_user_files = 0;
-out_ref:
- percpu_ref_exit(&file_data->refs);
out_free:
- kfree(file_data->table);
- kfree(file_data);
+ io_rsrc_data_free(ctx->file_data);
ctx->file_data = NULL;
return ret;
}
skb = NULL;
}
}
- spin_unlock_irq(&head->lock);
+ 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;
+ }
- if (skb) {
+ 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 0;
- }
-
- return __io_sqe_files_scm(ctx, 1, index);
-#else
- return 0;
-#endif
+ return ret;
}
-static int io_queue_file_removal(struct fixed_file_data *data,
- struct file *file)
+static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags)
{
- struct io_file_put *pfile;
- struct fixed_file_ref_node *ref_node = data->node;
+ 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;
- pfile = kzalloc(sizeof(*pfile), GFP_KERNEL);
- if (!pfile)
- return -ENOMEM;
+ 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;
- pfile->file = file;
- list_add(&pfile->list, &ref_node->file_list);
+ 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;
- return 0;
+ 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_files_update *up,
+ struct io_uring_rsrc_update2 *up,
unsigned nr_args)
{
- struct fixed_file_data *data = ctx->file_data;
- struct fixed_file_ref_node *ref_node;
+ 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;
- __s32 __user *fds;
- int fd, i, err;
- __u32 done;
+ int fd, i, err = 0;
+ unsigned int done;
bool needs_switch = false;
- if (check_add_overflow(up->offset, nr_args, &done))
- return -EOVERFLOW;
- if (done > ctx->nr_user_files)
+ if (!ctx->file_data)
+ return -ENXIO;
+ if (up->offset + nr_args > ctx->nr_user_files)
return -EINVAL;
- ref_node = alloc_fixed_file_ref_node(ctx);
- if (!ref_node)
- return -ENOMEM;
-
- done = 0;
- fds = u64_to_user_ptr(up->fds);
- while (nr_args) {
- struct fixed_file_table *table;
- unsigned index;
+ for (done = 0; done < nr_args; done++) {
+ u64 tag = 0;
- err = 0;
- if (copy_from_user(&fd, &fds[done], sizeof(fd))) {
+ if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) ||
+ copy_from_user(&fd, &fds[done], sizeof(fd))) {
err = -EFAULT;
break;
}
- i = array_index_nospec(up->offset, ctx->nr_user_files);
- table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
- index = i & IORING_FILE_TABLE_MASK;
- if (table->files[index]) {
- file = table->files[index];
- err = io_queue_file_removal(data, file);
+ 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;
- table->files[index] = NULL;
+ file_slot->file_ptr = 0;
needs_switch = true;
}
if (fd != -1) {
err = -EBADF;
break;
}
- table->files[index] = file;
+ *io_get_tag_slot(data, i) = tag;
+ io_fixed_file_set(file_slot, file);
err = io_sqe_file_register(ctx, file, i);
if (err) {
- table->files[index] = NULL;
+ file_slot->file_ptr = 0;
fput(file);
break;
}
}
- nr_args--;
- done++;
- up->offset++;
}
- if (needs_switch) {
- percpu_ref_kill(&data->node->refs);
- io_sqe_files_set_node(data, ref_node);
- } else
- destroy_fixed_file_ref_node(ref_node);
-
+ if (needs_switch)
+ io_rsrc_node_switch(ctx, data);
return done ? done : err;
}
-static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg,
- unsigned nr_args)
-{
- struct io_uring_files_update up;
-
- if (!ctx->file_data)
- return -ENXIO;
- if (!nr_args)
- return -EINVAL;
- if (copy_from_user(&up, arg, sizeof(up)))
- return -EFAULT;
- if (up.resv)
- return -EINVAL;
-
- return __io_sqe_files_update(ctx, &up, nr_args);
-}
-
-static void io_free_work(struct io_wq_work *work)
-{
- struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-
- /* Consider that io_steal_work() relies on this ref */
- io_put_req(req);
-}
-
-static int io_init_wq_offload(struct io_ring_ctx *ctx,
- struct io_uring_params *p)
+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;
- struct fd f;
- struct io_ring_ctx *ctx_attach;
unsigned int concurrency;
- int ret = 0;
-
- data.user = ctx->user;
- data.free_work = io_free_work;
- data.do_work = io_wq_submit_work;
- if (!(p->flags & IORING_SETUP_ATTACH_WQ)) {
- /* Do QD, or 4 * CPUS, whatever is smallest */
- concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
-
- ctx->io_wq = io_wq_create(concurrency, &data);
- if (IS_ERR(ctx->io_wq)) {
- ret = PTR_ERR(ctx->io_wq);
- ctx->io_wq = NULL;
+ 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);
}
- return ret;
+ refcount_set(&hash->refs, 1);
+ init_waitqueue_head(&hash->wait);
+ ctx->hash_map = hash;
}
+ mutex_unlock(&ctx->uring_lock);
- f = fdget(p->wq_fd);
- if (!f.file)
- return -EBADF;
-
- if (f.file->f_op != &io_uring_fops) {
- ret = -EINVAL;
- goto out_fput;
- }
+ data.hash = hash;
+ data.task = task;
+ data.free_work = io_wq_free_work;
+ data.do_work = io_wq_submit_work;
- ctx_attach = f.file->private_data;
- /* @io_wq is protected by holding the fd */
- if (!io_wq_get(ctx_attach->io_wq, &data)) {
- ret = -EINVAL;
- goto out_fput;
- }
+ /* Do QD, or 4 * CPUS, whatever is smallest */
+ concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
- ctx->io_wq = ctx_attach->io_wq;
-out_fput:
- fdput(f);
- return ret;
+ return io_wq_create(concurrency, &data);
}
-static int io_uring_alloc_task_context(struct task_struct *task)
+static int io_uring_alloc_task_context(struct task_struct *task,
+ struct io_ring_ctx *ctx)
{
struct io_uring_task *tctx;
int ret;
- tctx = kmalloc(sizeof(*tctx), GFP_KERNEL);
+ tctx = kzalloc(sizeof(*tctx), GFP_KERNEL);
if (unlikely(!tctx))
return -ENOMEM;
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);
- tctx->last = NULL;
atomic_set(&tctx->in_idle, 0);
- tctx->sqpoll = false;
- io_init_identity(&tctx->__identity);
- tctx->identity = &tctx->__identity;
+ 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;
}
struct io_uring_task *tctx = tsk->io_uring;
WARN_ON_ONCE(!xa_empty(&tctx->xa));
- WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1);
- if (tctx->identity != &tctx->__identity)
- kfree(tctx->identity);
+ WARN_ON_ONCE(tctx->io_wq);
+ WARN_ON_ONCE(tctx->cached_refs);
+
percpu_counter_destroy(&tctx->inflight);
kfree(tctx);
tsk->io_uring = NULL;
{
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;
- ret = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
- goto err;
-
- sqd = io_get_sq_data(p);
+ 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;
- io_sq_thread_park(sqd);
- mutex_lock(&sqd->ctx_lock);
- list_add(&ctx->sqd_list, &sqd->ctx_new_list);
- mutex_unlock(&sqd->ctx_lock);
- io_sq_thread_unpark(sqd);
-
ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle);
if (!ctx->sq_thread_idle)
ctx->sq_thread_idle = HZ;
- if (sqd->thread)
- goto done;
+ 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)
- goto err;
- if (!cpu_online(cpu))
- goto err;
-
- sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd,
- cpu, "io_uring-sq");
+ if (cpu >= nr_cpu_ids || !cpu_online(cpu))
+ goto err_sqpoll;
+ sqd->sq_cpu = cpu;
} else {
- sqd->thread = kthread_create(io_sq_thread, sqd,
- "io_uring-sq");
+ sqd->sq_cpu = -1;
}
- if (IS_ERR(sqd->thread)) {
- ret = PTR_ERR(sqd->thread);
- sqd->thread = NULL;
- goto err;
+
+ 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;
}
- ret = io_uring_alloc_task_context(sqd->thread);
+
+ 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) {
goto err;
}
-done:
- ret = io_init_wq_offload(ctx, p);
- if (ret)
- goto err;
-
return 0;
+err_sqpoll:
+ complete(&ctx->sq_data->exited);
err:
- io_finish_async(ctx);
+ io_sq_thread_finish(ctx);
return ret;
}
-static void io_sq_offload_start(struct io_ring_ctx *ctx)
-{
- struct io_sq_data *sqd = ctx->sq_data;
-
- ctx->flags &= ~IORING_SETUP_R_DISABLED;
- if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd && sqd->thread)
- wake_up_process(sqd->thread);
-}
-
static inline void __io_unaccount_mem(struct user_struct *user,
unsigned long nr_pages)
{
return 0;
}
-static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages,
- enum io_mem_account acct)
+static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
{
- if (ctx->limit_mem)
+ if (ctx->user)
__io_unaccount_mem(ctx->user, nr_pages);
- if (ctx->mm_account) {
- if (acct == ACCT_LOCKED)
- ctx->mm_account->locked_vm -= nr_pages;
- else if (acct == ACCT_PINNED)
- atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm);
- }
+ 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,
- enum io_mem_account acct)
+static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
{
int ret;
- if (ctx->limit_mem) {
+ if (ctx->user) {
ret = __io_account_mem(ctx->user, nr_pages);
if (ret)
return ret;
}
- if (ctx->mm_account) {
- if (acct == ACCT_LOCKED)
- ctx->mm_account->locked_vm += nr_pages;
- else if (acct == ACCT_PINNED)
- atomic64_add(nr_pages, &ctx->mm_account->pinned_vm);
- }
+ if (ctx->mm_account)
+ atomic64_add(nr_pages, &ctx->mm_account->pinned_vm);
return 0;
}
static void *io_mem_alloc(size_t size)
{
- gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP |
- __GFP_NORETRY;
+ gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP;
- return (void *) __get_free_pages(gfp_flags, get_order(size));
+ return (void *) __get_free_pages(gfp, get_order(size));
}
static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries,
return off;
}
-static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries)
+static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot)
{
- size_t pages;
-
- pages = (size_t)1 << get_order(
- rings_size(sq_entries, cq_entries, NULL));
- pages += (size_t)1 << get_order(
- array_size(sizeof(struct io_uring_sqe), sq_entries));
+ struct io_mapped_ubuf *imu = *slot;
+ unsigned int i;
- return pages;
+ 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 int io_sqe_buffer_unregister(struct io_ring_ctx *ctx)
+static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc)
{
- int i, j;
+ io_buffer_unmap(ctx, &prsrc->buf);
+ prsrc->buf = NULL;
+}
- if (!ctx->user_bufs)
- return -ENXIO;
+static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
+{
+ unsigned int i;
- for (i = 0; i < ctx->nr_user_bufs; i++) {
- struct io_mapped_ubuf *imu = &ctx->user_bufs[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;
+}
- for (j = 0; j < imu->nr_bvecs; j++)
- unpin_user_page(imu->bvec[j].bv_page);
+static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
+{
+ unsigned nr = ctx->nr_user_bufs;
+ int ret;
- if (imu->acct_pages)
- io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED);
- kvfree(imu->bvec);
- imu->nr_bvecs = 0;
- }
+ if (!ctx->buf_data)
+ return -ENXIO;
- kfree(ctx->user_bufs);
- ctx->user_bufs = NULL;
+ /*
+ * Quiesce may unlock ->uring_lock, and while it's not held
+ * prevent new requests using the table.
+ */
ctx->nr_user_bufs = 0;
- return 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,
/* check previously registered pages */
for (i = 0; i < ctx->nr_user_bufs; i++) {
- struct io_mapped_ubuf *imu = &ctx->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))
{
int i, ret;
+ imu->acct_pages = 0;
for (i = 0; i < nr_pages; i++) {
if (!PageCompound(pages[i])) {
imu->acct_pages++;
if (!imu->acct_pages)
return 0;
- ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED);
+ 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, void __user *arg,
- unsigned nr_args)
+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;
- int i, j, got_pages = 0;
- int ret = -EINVAL;
+ struct io_rsrc_data *data;
+ int i, ret;
+ struct iovec iov;
if (ctx->user_bufs)
return -EBUSY;
- if (!nr_args || nr_args > UIO_MAXIOV)
+ 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;
+ }
- ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf),
- GFP_KERNEL);
- if (!ctx->user_bufs)
- return -ENOMEM;
-
- for (i = 0; i < nr_args; i++) {
- struct io_mapped_ubuf *imu = &ctx->user_bufs[i];
- unsigned long off, start, end, ubuf;
- int pret, nr_pages;
- struct iovec iov;
- size_t size;
-
+ for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) {
ret = io_copy_iov(ctx, &iov, arg, i);
if (ret)
- goto err;
+ break;
+ ret = io_buffer_validate(&iov);
+ if (ret)
+ break;
+ if (!iov.iov_base && *io_get_tag_slot(data, i)) {
+ ret = -EINVAL;
+ break;
+ }
- /*
- * Don't impose further limits on the size and buffer
- * constraints here, we'll -EINVAL later when IO is
- * submitted if they are wrong.
- */
- ret = -EFAULT;
- if (!iov.iov_base || !iov.iov_len)
- goto err;
+ ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
+ &last_hpage);
+ if (ret)
+ break;
+ }
- /* arbitrary limit, but we need something */
- if (iov.iov_len > SZ_1G)
- goto err;
+ WARN_ON_ONCE(ctx->buf_data);
- ubuf = (unsigned long) iov.iov_base;
- end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- start = ubuf >> PAGE_SHIFT;
- nr_pages = end - start;
+ ctx->buf_data = data;
+ if (ret)
+ __io_sqe_buffers_unregister(ctx);
+ else
+ io_rsrc_node_switch(ctx, NULL);
+ return ret;
+}
- ret = 0;
- if (!pages || nr_pages > got_pages) {
- kvfree(vmas);
- kvfree(pages);
- pages = kvmalloc_array(nr_pages, sizeof(struct page *),
- GFP_KERNEL);
- vmas = kvmalloc_array(nr_pages,
- sizeof(struct vm_area_struct *),
- GFP_KERNEL);
- if (!pages || !vmas) {
- ret = -ENOMEM;
- goto err;
- }
- got_pages = nr_pages;
- }
+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;
- imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec),
- GFP_KERNEL);
- ret = -ENOMEM;
- if (!imu->bvec)
- goto err;
+ for (done = 0; done < nr_args; done++) {
+ struct io_mapped_ubuf *imu;
+ int offset = up->offset + done;
+ u64 tag = 0;
- 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 (j = 0; j < nr_pages; j++) {
- struct vm_area_struct *vma = vmas[j];
-
- 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);
- kvfree(imu->bvec);
- goto err;
+ err = io_copy_iov(ctx, &iov, iovs, done);
+ if (err)
+ break;
+ if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) {
+ err = -EFAULT;
+ break;
}
-
- ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage);
- if (ret) {
- unpin_user_pages(pages, pret);
- kvfree(imu->bvec);
- goto err;
+ 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;
- off = ubuf & ~PAGE_MASK;
- size = iov.iov_len;
- for (j = 0; j < nr_pages; j++) {
- size_t vec_len;
-
- vec_len = min_t(size_t, size, PAGE_SIZE - off);
- imu->bvec[j].bv_page = pages[j];
- imu->bvec[j].bv_len = vec_len;
- imu->bvec[j].bv_offset = off;
- off = 0;
- size -= vec_len;
+ 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;
}
- /* store original address for later verification */
- imu->ubuf = ubuf;
- imu->len = iov.iov_len;
- imu->nr_bvecs = nr_pages;
- ctx->nr_user_bufs++;
+ ctx->user_bufs[i] = imu;
+ *io_get_tag_slot(ctx->buf_data, offset) = tag;
}
- kvfree(pages);
- kvfree(vmas);
- return 0;
-err:
- kvfree(pages);
- kvfree(vmas);
- io_sqe_buffer_unregister(ctx);
- return ret;
+
+ 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)
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;
}
__io_remove_buffers(ctx, buf, index, -1U);
}
-static void io_ring_ctx_free(struct io_ring_ctx *ctx)
+static void io_req_cache_free(struct list_head *list)
{
- io_finish_async(ctx);
- io_sqe_buffer_unregister(ctx);
+ struct io_kiocb *req, *nxt;
- if (ctx->sqo_task) {
- put_task_struct(ctx->sqo_task);
- ctx->sqo_task = NULL;
+ list_for_each_entry_safe(req, nxt, list, inflight_entry) {
+ list_del(&req->inflight_entry);
+ kmem_cache_free(req_cachep, req);
}
+}
-#ifdef CONFIG_BLK_CGROUP
- if (ctx->sqo_blkcg_css)
- css_put(ctx->sqo_blkcg_css);
-#endif
+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);
- io_sqe_files_unregister(ctx);
+ 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) {
sock_release(ctx->ring_sock);
}
#endif
+ WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
if (ctx->mm_account) {
mmdrop(ctx->mm_account);
percpu_ref_exit(&ctx->refs);
free_uid(ctx->user);
- put_cred(ctx->creds);
+ io_req_caches_free(ctx);
+ if (ctx->hash_map)
+ io_wq_put_hash(ctx->hash_map);
kfree(ctx->cancel_hash);
- kmem_cache_free(req_cachep, ctx->fallback_req);
+ kfree(ctx->dummy_ubuf);
kfree(ctx);
}
struct io_ring_ctx *ctx = file->private_data;
__poll_t mask = 0;
- poll_wait(file, &ctx->cq_wait, wait);
+ poll_wait(file, &ctx->poll_wait, wait);
/*
* synchronizes with barrier from wq_has_sleeper call in
* io_commit_cqring
* 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->cq_check_overflow))
+ if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;
}
-static int io_uring_fasync(int fd, struct file *file, int on)
-{
- struct io_ring_ctx *ctx = file->private_data;
-
- return fasync_helper(fd, file, on, &ctx->cq_fasync);
-}
-
static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
{
- struct io_identity *iod;
+ const struct cred *creds;
- iod = xa_erase(&ctx->personalities, id);
- if (iod) {
- put_cred(iod->creds);
- if (refcount_dec_and_test(&iod->count))
- kfree(iod);
+ 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);
+ 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
* as nobody else will be looking for them.
*/
do {
- io_iopoll_try_reap_events(ctx);
- } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20));
+ 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);
}
-static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data)
+/* 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 = container_of(work, struct io_kiocb, work);
+ struct io_kiocb *req, *tmp;
+ int canceled = 0;
- return req->ctx == data;
+ 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 io_identify *iod;
+ struct creds *creds;
mutex_lock(&ctx->uring_lock);
percpu_ref_kill(&ctx->refs);
- /* if force is set, the ring is going away. always drop after that */
-
- if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead))
- ctx->sqo_dead = 1;
-
- ctx->cq_overflow_flushed = 1;
if (ctx->rings)
- __io_cqring_overflow_flush(ctx, true, NULL, NULL);
+ __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, NULL);
- io_poll_remove_all(ctx, NULL, NULL);
-
- if (ctx->io_wq)
- io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true);
+ 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);
- xa_for_each(&ctx->personalities, index, iod)
- io_unregister_personality(ctx, index);
-
- /*
- * Do this upfront, so we won't have a grace period where the ring
- * is closed but resources aren't reaped yet. This can cause
- * spurious failure in setting up a new ring.
- */
- io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries),
- ACCT_LOCKED);
INIT_WORK(&ctx->exit_work, io_ring_exit_work);
/*
struct io_task_cancel {
struct task_struct *task;
- struct files_struct *files;
+ 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;
- bool ret;
-
- if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) {
- unsigned long flags;
- struct io_ring_ctx *ctx = req->ctx;
- /* protect against races with linked timeouts */
- spin_lock_irqsave(&ctx->completion_lock, flags);
- ret = io_match_task(req, cancel->task, cancel->files);
- spin_unlock_irqrestore(&ctx->completion_lock, flags);
- } else {
- ret = io_match_task(req, cancel->task, cancel->files);
- }
- return ret;
+ return io_match_task_safe(req, cancel->task, cancel->all);
}
-static void io_cancel_defer_files(struct io_ring_ctx *ctx,
- struct task_struct *task,
- struct files_struct *files)
+static bool io_cancel_defer_files(struct io_ring_ctx *ctx,
+ struct task_struct *task, bool cancel_all)
{
- struct io_defer_entry *de = NULL;
+ struct io_defer_entry *de;
LIST_HEAD(list);
- spin_lock_irq(&ctx->completion_lock);
+ spin_lock(&ctx->completion_lock);
list_for_each_entry_reverse(de, &ctx->defer_list, list) {
- if (io_match_task(de->req, task, files)) {
+ if (io_match_task_safe(de->req, task, cancel_all)) {
list_cut_position(&list, &ctx->defer_list, &de->list);
break;
}
}
- spin_unlock_irq(&ctx->completion_lock);
+ 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);
- req_set_fail_links(de->req);
- io_put_req(de->req);
- io_req_complete(de->req, -ECANCELED);
+ io_req_complete_failed(de->req, -ECANCELED);
kfree(de);
}
+ return true;
}
-static int io_uring_count_inflight(struct io_ring_ctx *ctx,
- struct task_struct *task,
- struct files_struct *files)
-{
- struct io_kiocb *req;
- int cnt = 0;
-
- spin_lock_irq(&ctx->inflight_lock);
- list_for_each_entry(req, &ctx->inflight_list, inflight_entry)
- cnt += io_match_task(req, task, files);
- spin_unlock_irq(&ctx->inflight_lock);
- return cnt;
-}
-
-static void io_uring_cancel_files(struct io_ring_ctx *ctx,
- struct task_struct *task,
- struct files_struct *files)
+static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx)
{
- while (!list_empty_careful(&ctx->inflight_list)) {
- struct io_task_cancel cancel = { .task = task, .files = files };
- DEFINE_WAIT(wait);
- int inflight;
-
- inflight = io_uring_count_inflight(ctx, task, files);
- if (!inflight)
- break;
+ struct io_tctx_node *node;
+ enum io_wq_cancel cret;
+ bool ret = false;
- io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true);
- io_poll_remove_all(ctx, task, files);
- io_kill_timeouts(ctx, task, files);
- /* cancellations _may_ trigger task work */
- io_run_task_work();
+ mutex_lock(&ctx->uring_lock);
+ list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
+ struct io_uring_task *tctx = node->task->io_uring;
- prepare_to_wait(&task->io_uring->wait, &wait,
- TASK_UNINTERRUPTIBLE);
- if (inflight == io_uring_count_inflight(ctx, task, files))
- schedule();
- finish_wait(&task->io_uring->wait, &wait);
+ /*
+ * 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_cancel_task_requests(struct io_ring_ctx *ctx,
- struct task_struct *task)
+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) {
- struct io_task_cancel cancel = { .task = task, .files = NULL, };
enum io_wq_cancel cret;
bool ret = false;
- cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true);
- if (cret != IO_WQ_CANCEL_NOTFOUND)
- ret = true;
+ 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)) {
+ 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_poll_remove_all(ctx, task, NULL);
- ret |= io_kill_timeouts(ctx, task, NULL);
+ 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;
- io_run_task_work();
cond_resched();
}
}
-static void io_disable_sqo_submit(struct io_ring_ctx *ctx)
-{
- mutex_lock(&ctx->uring_lock);
- ctx->sqo_dead = 1;
- if (ctx->flags & IORING_SETUP_R_DISABLED)
- io_sq_offload_start(ctx);
- mutex_unlock(&ctx->uring_lock);
-
- /* make sure callers enter the ring to get error */
- if (ctx->rings)
- io_ring_set_wakeup_flag(ctx);
-}
-
-/*
- * We need to iteratively cancel requests, in case a request has dependent
- * hard links. These persist even for failure of cancelations, hence keep
- * looping until none are found.
- */
-static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
- struct files_struct *files)
-{
- struct task_struct *task = current;
-
- if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
- io_disable_sqo_submit(ctx);
- task = ctx->sq_data->thread;
- atomic_inc(&task->io_uring->in_idle);
- io_sq_thread_park(ctx->sq_data);
- }
-
- io_cancel_defer_files(ctx, task, files);
- io_cqring_overflow_flush(ctx, true, task, files);
-
- if (!files)
- __io_uring_cancel_task_requests(ctx, task);
- else
- io_uring_cancel_files(ctx, task, files);
-
- if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
- atomic_dec(&task->io_uring->in_idle);
- io_sq_thread_unpark(ctx->sq_data);
- }
-}
-
-/*
- * Note that this task has used io_uring. We use it for cancelation purposes.
- */
-static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file)
+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);
+ ret = io_uring_alloc_task_context(current, ctx);
if (unlikely(ret))
return ret;
+
tctx = current->io_uring;
- }
- if (tctx->last != file) {
- void *old = xa_load(&tctx->xa, (unsigned long)file);
+ if (ctx->iowq_limits_set) {
+ unsigned int limits[2] = { ctx->iowq_limits[0],
+ ctx->iowq_limits[1], };
- if (!old) {
- get_file(file);
- ret = xa_err(xa_store(&tctx->xa, (unsigned long)file,
- file, GFP_KERNEL));
- if (ret) {
- fput(file);
+ ret = io_wq_max_workers(tctx->io_wq, limits);
+ if (ret)
return ret;
- }
}
- tctx->last = file;
}
+ if (!xa_load(&tctx->xa, (unsigned long)ctx)) {
+ node = kmalloc(sizeof(*node), GFP_KERNEL);
+ if (!node)
+ return -ENOMEM;
+ node->ctx = ctx;
+ node->task = current;
- /*
- * This is race safe in that the task itself is doing this, hence it
- * cannot be going through the exit/cancel paths at the same time.
- * This cannot be modified while exit/cancel is running.
- */
- if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL))
- tctx->sqpoll = true;
+ 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;
}
/*
- * Remove this io_uring_file -> task mapping.
+ * Note that this task has used io_uring. We use it for cancelation purposes.
*/
-static void io_uring_del_task_file(struct file *file)
+static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
{
struct io_uring_task *tctx = current->io_uring;
- if (tctx->last == file)
- tctx->last = NULL;
- file = xa_erase(&tctx->xa, (unsigned long)file);
- if (file)
- fput(file);
+ if (likely(tctx && tctx->last == ctx))
+ return 0;
+ return __io_uring_add_tctx_node(ctx);
}
-static void io_uring_remove_task_files(struct io_uring_task *tctx)
+/*
+ * Remove this io_uring_file -> task mapping.
+ */
+static void io_uring_del_tctx_node(unsigned long index)
{
- struct file *file;
- unsigned long index;
+ struct io_uring_task *tctx = current->io_uring;
+ struct io_tctx_node *node;
- xa_for_each(&tctx->xa, index, file)
- io_uring_del_task_file(file);
-}
+ if (!tctx)
+ return;
+ node = xa_erase(&tctx->xa, index);
+ if (!node)
+ return;
-void __io_uring_files_cancel(struct files_struct *files)
-{
- struct io_uring_task *tctx = current->io_uring;
- struct file *file;
- unsigned long index;
+ WARN_ON_ONCE(current != node->task);
+ WARN_ON_ONCE(list_empty(&node->ctx_node));
- /* make sure overflow events are dropped */
- atomic_inc(&tctx->in_idle);
- xa_for_each(&tctx->xa, index, file)
- io_uring_cancel_task_requests(file->private_data, files);
- atomic_dec(&tctx->in_idle);
+ mutex_lock(&node->ctx->uring_lock);
+ list_del(&node->ctx_node);
+ mutex_unlock(&node->ctx->uring_lock);
- if (files)
- io_uring_remove_task_files(tctx);
+ if (tctx->last == node->ctx)
+ tctx->last = NULL;
+ kfree(node);
}
-static s64 tctx_inflight(struct io_uring_task *tctx)
+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;
- struct file *file;
- s64 inflight;
-
- inflight = percpu_counter_sum(&tctx->inflight);
- if (!tctx->sqpoll)
- return inflight;
- /*
- * If we have SQPOLL rings, then we need to iterate and find them, and
- * add the pending count for those.
- */
- xa_for_each(&tctx->xa, index, file) {
- struct io_ring_ctx *ctx = file->private_data;
-
- if (ctx->flags & IORING_SETUP_SQPOLL) {
- struct io_uring_task *__tctx = ctx->sqo_task->io_uring;
-
- inflight += percpu_counter_sum(&__tctx->inflight);
- }
+ 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;
}
+}
- return inflight;
+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 fd that this task has registered or done IO on, and cancel
- * requests.
+ * 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.
*/
-void __io_uring_task_cancel(void)
+static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd)
{
struct io_uring_task *tctx = current->io_uring;
- DEFINE_WAIT(wait);
+ struct io_ring_ctx *ctx;
s64 inflight;
+ DEFINE_WAIT(wait);
- /* make sure overflow events are dropped */
- atomic_inc(&tctx->in_idle);
+ WARN_ON_ONCE(sqd && sqd->thread != current);
- /* trigger io_disable_sqo_submit() */
- if (tctx->sqpoll)
- __io_uring_files_cancel(NULL);
+ 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);
+ inflight = tctx_inflight(tctx, !cancel_all);
if (!inflight)
break;
- __io_uring_files_cancel(NULL);
-
- prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE);
-
- /*
- * 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))
- schedule();
- finish_wait(&tctx->wait, &wait);
- } while (1);
-
- atomic_dec(&tctx->in_idle);
-
- io_uring_remove_task_files(tctx);
-}
-
-static int io_uring_flush(struct file *file, void *data)
-{
- struct io_uring_task *tctx = current->io_uring;
- struct io_ring_ctx *ctx = file->private_data;
-
- if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
- io_uring_cancel_task_requests(ctx, NULL);
- if (!tctx)
- return 0;
+ if (!sqd) {
+ struct io_tctx_node *node;
+ unsigned long index;
- /* we should have cancelled and erased it before PF_EXITING */
- WARN_ON_ONCE((current->flags & PF_EXITING) &&
- xa_load(&tctx->xa, (unsigned long)file));
+ 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);
+ }
- /*
- * fput() is pending, will be 2 if the only other ref is our potential
- * task file note. If the task is exiting, drop regardless of count.
- */
- if (atomic_long_read(&file->f_count) != 2)
- return 0;
+ prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE);
+ io_run_task_work();
+ io_uring_drop_tctx_refs(current);
- if (ctx->flags & IORING_SETUP_SQPOLL) {
- /* there is only one file note, which is owned by sqo_task */
- WARN_ON_ONCE(ctx->sqo_task != current &&
- xa_load(&tctx->xa, (unsigned long)file));
- /* sqo_dead check is for when this happens after cancellation */
- WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead &&
- !xa_load(&tctx->xa, (unsigned long)file));
+ /*
+ * 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_disable_sqo_submit(ctx);
+ 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);
}
+}
- if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current)
- io_uring_del_task_file(file);
- return 0;
+void __io_uring_cancel(bool cancel_all)
+{
+ io_uring_cancel_generic(cancel_all, NULL);
}
static void *io_uring_validate_mmap_request(struct file *file,
static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
{
- int ret = 0;
DEFINE_WAIT(wait);
do {
if (!io_sqring_full(ctx))
break;
-
prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE);
- if (unlikely(ctx->sqo_dead)) {
- ret = -EOWNERDEAD;
- break;
- }
-
if (!io_sqring_full(ctx))
break;
-
schedule();
} while (!signal_pending(current));
finish_wait(&ctx->sqo_sq_wait, &wait);
- return ret;
+ 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 sigset_t __user *, sig,
- size_t, sigsz)
+ u32, min_complete, u32, flags, const void __user *, argp,
+ size_t, argsz)
{
struct io_ring_ctx *ctx;
- long ret = -EBADF;
int submitted = 0;
struct fd f;
+ long ret;
io_run_task_work();
- if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP |
- IORING_ENTER_SQ_WAIT))
+ if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP |
+ IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)))
return -EINVAL;
f = fdget(fd);
- if (!f.file)
+ if (unlikely(!f.file))
return -EBADF;
ret = -EOPNOTSUPP;
- if (f.file->f_op != &io_uring_fops)
+ if (unlikely(f.file->f_op != &io_uring_fops))
goto out_fput;
ret = -ENXIO;
ctx = f.file->private_data;
- if (!percpu_ref_tryget(&ctx->refs))
+ if (unlikely(!percpu_ref_tryget(&ctx->refs)))
goto out_fput;
ret = -EBADFD;
- if (ctx->flags & IORING_SETUP_R_DISABLED)
+ if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED))
goto out;
/*
*/
ret = 0;
if (ctx->flags & IORING_SETUP_SQPOLL) {
- io_cqring_overflow_flush(ctx, false, NULL, NULL);
+ io_cqring_overflow_flush(ctx);
- if (unlikely(ctx->sqo_dead)) {
+ if (unlikely(ctx->sq_data->thread == NULL)) {
ret = -EOWNERDEAD;
goto out;
}
}
submitted = to_submit;
} else if (to_submit) {
- ret = io_uring_add_task_file(ctx, f.file);
+ ret = io_uring_add_tctx_node(ctx);
if (unlikely(ret))
goto out;
mutex_lock(&ctx->uring_lock);
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);
/*
!(ctx->flags & IORING_SETUP_SQPOLL)) {
ret = io_iopoll_check(ctx, min_complete);
} else {
- ret = io_cqring_wait(ctx, min_complete, sig, sigsz);
+ ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts);
}
}
#ifdef CONFIG_PROC_FS
static int io_uring_show_cred(struct seq_file *m, unsigned int id,
- const struct io_identity *iod)
+ const struct cred *cred)
{
- const struct cred *cred = iod->creds;
struct user_namespace *uns = seq_user_ns(m);
struct group_info *gi;
kernel_cap_t cap;
*/
has_lock = mutex_trylock(&ctx->uring_lock);
- if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL))
+ 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 fixed_file_table *table;
- struct file *f;
+ struct file *f = io_file_from_index(ctx, i);
- table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
- f = table->files[i & IORING_FILE_TABLE_MASK];
if (f)
seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
else
}
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];
+ 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,
- (unsigned int) buf->len);
+ seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
}
if (has_lock && !xa_empty(&ctx->personalities)) {
unsigned long index;
- const struct io_identity *iod;
+ const struct cred *cred;
seq_printf(m, "Personalities:\n");
- xa_for_each(&ctx->personalities, index, iod)
- io_uring_show_cred(m, index, iod);
+ xa_for_each(&ctx->personalities, index, cred)
+ io_uring_show_cred(m, index, cred);
}
seq_printf(m, "PollList:\n");
- spin_lock_irq(&ctx->completion_lock);
+ 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;
seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
req->task->task_works != NULL);
}
- spin_unlock_irq(&ctx->completion_lock);
+ spin_unlock(&ctx->completion_lock);
if (has_lock)
mutex_unlock(&ctx->uring_lock);
}
static const struct file_operations io_uring_fops = {
.release = io_uring_release,
- .flush = io_uring_flush,
.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,
- .fasync = io_uring_fasync,
#ifdef CONFIG_PROC_FS
.show_fdinfo = io_uring_show_fdinfo,
#endif
rings->cq_ring_mask = p->cq_entries - 1;
rings->sq_ring_entries = p->sq_entries;
rings->cq_ring_entries = p->cq_entries;
- ctx->sq_mask = rings->sq_ring_mask;
- ctx->cq_mask = rings->cq_ring_mask;
size = array_size(sizeof(struct io_uring_sqe), p->sq_entries);
if (size == SIZE_MAX) {
if (fd < 0)
return fd;
- ret = io_uring_add_task_file(ctx, file);
+ ret = io_uring_add_tctx_node(ctx);
if (ret) {
put_unused_fd(fd);
return ret;
static int io_uring_create(unsigned entries, struct io_uring_params *p,
struct io_uring_params __user *params)
{
- struct user_struct *user = NULL;
struct io_ring_ctx *ctx;
struct file *file;
- bool limit_mem;
int ret;
if (!entries)
p->cq_entries = 2 * p->sq_entries;
}
- user = get_uid(current_user());
- limit_mem = !capable(CAP_IPC_LOCK);
-
- if (limit_mem) {
- ret = __io_account_mem(user,
- ring_pages(p->sq_entries, p->cq_entries));
- if (ret) {
- free_uid(user);
- return ret;
- }
- }
-
ctx = io_ring_ctx_alloc(p);
- if (!ctx) {
- if (limit_mem)
- __io_unaccount_mem(user, ring_pages(p->sq_entries,
- p->cq_entries));
- free_uid(user);
+ if (!ctx)
return -ENOMEM;
- }
ctx->compat = in_compat_syscall();
- ctx->user = user;
- ctx->creds = get_current_cred();
-#ifdef CONFIG_AUDIT
- ctx->loginuid = current->loginuid;
- ctx->sessionid = current->sessionid;
-#endif
- ctx->sqo_task = get_task_struct(current);
+ if (!capable(CAP_IPC_LOCK))
+ ctx->user = get_uid(current_user());
/*
* This is just grabbed for accounting purposes. When a process exits,
mmgrab(current->mm);
ctx->mm_account = current->mm;
-#ifdef CONFIG_BLK_CGROUP
- /*
- * The sq thread will belong to the original cgroup it was inited in.
- * If the cgroup goes offline (e.g. disabling the io controller), then
- * issued bios will be associated with the closest cgroup later in the
- * block layer.
- */
- rcu_read_lock();
- ctx->sqo_blkcg_css = blkcg_css();
- ret = css_tryget_online(ctx->sqo_blkcg_css);
- rcu_read_unlock();
- if (!ret) {
- /* don't init against a dying cgroup, have the user try again */
- ctx->sqo_blkcg_css = NULL;
- ret = -ENODEV;
- goto err;
- }
-#endif
-
- /*
- * Account memory _before_ installing the file descriptor. Once
- * the descriptor is installed, it can get closed at any time. Also
- * do this before hitting the general error path, as ring freeing
- * will un-account as well.
- */
- io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries),
- ACCT_LOCKED);
- ctx->limit_mem = limit_mem;
-
ret = io_allocate_scq_urings(ctx, p);
if (ret)
goto err;
ret = io_sq_offload_create(ctx, p);
if (ret)
goto err;
-
- if (!(p->flags & IORING_SETUP_R_DISABLED))
- io_sq_offload_start(ctx);
+ /* 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->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_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;
*/
ret = io_uring_install_fd(ctx, file);
if (ret < 0) {
- io_disable_sqo_submit(ctx);
/* 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_disable_sqo_submit(ctx);
io_ring_ctx_wait_and_kill(ctx);
return ret;
}
static int io_register_personality(struct io_ring_ctx *ctx)
{
- struct io_identity *iod;
+ const struct cred *creds;
u32 id;
int ret;
- iod = kmalloc(sizeof(*iod), GFP_KERNEL);
- if (unlikely(!iod))
- return -ENOMEM;
-
- io_init_identity(iod);
- iod->creds = get_current_cred();
+ creds = get_current_cred();
- ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)iod,
+ ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds,
XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL);
if (ret < 0) {
- put_cred(iod->creds);
- kfree(iod);
+ put_cred(creds);
return ret;
}
return id;
if (ctx->restrictions.registered)
ctx->restricted = 1;
- io_sq_offload_start(ctx);
+ 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();
+
+#ifdef CONFIG_COMPAT
+ 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);
+ }
+#else
+ ret = copy_from_user(new_mask, arg, len);
+#endif
+
+ 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)
if (percpu_ref_is_dying(&ctx->refs))
return -ENXIO;
- if (io_register_op_must_quiesce(opcode)) {
- 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();
- if (ret < 0)
- break;
- } while (1);
- mutex_lock(&ctx->uring_lock);
-
- if (ret) {
- io_refs_resurrect(&ctx->refs, &ctx->ref_comp);
- return ret;
- }
- }
-
if (ctx->restricted) {
- if (opcode >= IORING_REGISTER_LAST) {
- ret = -EINVAL;
- goto out;
- }
+ 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 (!test_bit(opcode, ctx->restrictions.register_op)) {
- ret = -EACCES;
- goto out;
- }
+ 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_buffer_register(ctx, arg, nr_args);
+ 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_buffer_unregister(ctx);
+ ret = io_sqe_buffers_unregister(ctx);
break;
case IORING_REGISTER_FILES:
- ret = io_sqe_files_register(ctx, arg, nr_args);
+ ret = io_sqe_files_register(ctx, arg, nr_args, NULL);
break;
case IORING_UNREGISTER_FILES:
ret = -EINVAL;
ret = io_sqe_files_unregister(ctx);
break;
case IORING_REGISTER_FILES_UPDATE:
- ret = io_sqe_files_update(ctx, arg, nr_args);
+ ret = io_register_files_update(ctx, arg, nr_args);
break;
case IORING_REGISTER_EVENTFD:
case IORING_REGISTER_EVENTFD_ASYNC:
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;
}
-out:
if (io_register_op_must_quiesce(opcode)) {
/* bring the ctx back to life */
percpu_ref_reinit(&ctx->refs);
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);
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);
+ 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);
projects / thirdparty / kernel / stable.git / commitdiff
