1 // SPDX-License-Identifier: GPL-2.0
3 * Shared application/kernel submission and completion ring pairs, for
4 * supporting fast/efficient IO.
6 * A note on the read/write ordering memory barriers that are matched between
7 * the application and kernel side.
9 * After the application reads the CQ ring tail, it must use an
10 * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses
11 * before writing the tail (using smp_load_acquire to read the tail will
12 * do). It also needs a smp_mb() before updating CQ head (ordering the
13 * entry load(s) with the head store), pairing with an implicit barrier
14 * through a control-dependency in io_get_cqring (smp_store_release to
15 * store head will do). Failure to do so could lead to reading invalid
18 * Likewise, the application must use an appropriate smp_wmb() before
19 * writing the SQ tail (ordering SQ entry stores with the tail store),
20 * which pairs with smp_load_acquire in io_get_sqring (smp_store_release
21 * to store the tail will do). And it needs a barrier ordering the SQ
22 * head load before writing new SQ entries (smp_load_acquire to read
25 * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application
26 * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after*
27 * updating the SQ tail; a full memory barrier smp_mb() is needed
30 * Also see the examples in the liburing library:
32 * git://git.kernel.dk/liburing
34 * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens
35 * from data shared between the kernel and application. This is done both
36 * for ordering purposes, but also to ensure that once a value is loaded from
37 * data that the application could potentially modify, it remains stable.
39 * Copyright (C) 2018-2019 Jens Axboe
40 * Copyright (c) 2018-2019 Christoph Hellwig
42 #include <linux/kernel.h>
43 #include <linux/init.h>
44 #include <linux/errno.h>
45 #include <linux/syscalls.h>
46 #include <linux/compat.h>
47 #include <net/compat.h>
48 #include <linux/refcount.h>
49 #include <linux/uio.h>
50 #include <linux/bits.h>
52 #include <linux/sched/signal.h>
54 #include <linux/file.h>
55 #include <linux/fdtable.h>
57 #include <linux/mman.h>
58 #include <linux/percpu.h>
59 #include <linux/slab.h>
60 #include <linux/blkdev.h>
61 #include <linux/bvec.h>
62 #include <linux/net.h>
64 #include <net/af_unix.h>
66 #include <linux/anon_inodes.h>
67 #include <linux/sched/mm.h>
68 #include <linux/uaccess.h>
69 #include <linux/nospec.h>
70 #include <linux/sizes.h>
71 #include <linux/hugetlb.h>
72 #include <linux/highmem.h>
73 #include <linux/namei.h>
74 #include <linux/fsnotify.h>
75 #include <linux/fadvise.h>
76 #include <linux/eventpoll.h>
77 #include <linux/splice.h>
78 #include <linux/task_work.h>
79 #include <linux/pagemap.h>
80 #include <linux/io_uring.h>
82 #define CREATE_TRACE_POINTS
83 #include <trace/events/io_uring.h>
85 #include <uapi/linux/io_uring.h>
90 #define IORING_MAX_ENTRIES 32768
91 #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
94 * Shift of 9 is 512 entries, or exactly one page on 64-bit archs
96 #define IORING_FILE_TABLE_SHIFT 9
97 #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT)
98 #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1)
99 #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE)
100 #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \
101 IORING_REGISTER_LAST + IORING_OP_LAST)
103 #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
104 IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
108 u32 head ____cacheline_aligned_in_smp
;
109 u32 tail ____cacheline_aligned_in_smp
;
113 * This data is shared with the application through the mmap at offsets
114 * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING.
116 * The offsets to the member fields are published through struct
117 * io_sqring_offsets when calling io_uring_setup.
121 * Head and tail offsets into the ring; the offsets need to be
122 * masked to get valid indices.
124 * The kernel controls head of the sq ring and the tail of the cq ring,
125 * and the application controls tail of the sq ring and the head of the
128 struct io_uring sq
, cq
;
130 * Bitmasks to apply to head and tail offsets (constant, equals
133 u32 sq_ring_mask
, cq_ring_mask
;
134 /* Ring sizes (constant, power of 2) */
135 u32 sq_ring_entries
, cq_ring_entries
;
137 * Number of invalid entries dropped by the kernel due to
138 * invalid index stored in array
140 * Written by the kernel, shouldn't be modified by the
141 * application (i.e. get number of "new events" by comparing to
144 * After a new SQ head value was read by the application this
145 * counter includes all submissions that were dropped reaching
146 * the new SQ head (and possibly more).
152 * Written by the kernel, shouldn't be modified by the
155 * The application needs a full memory barrier before checking
156 * for IORING_SQ_NEED_WAKEUP after updating the sq tail.
162 * Written by the application, shouldn't be modified by the
167 * Number of completion events lost because the queue was full;
168 * this should be avoided by the application by making sure
169 * there are not more requests pending than there is space in
170 * the completion queue.
172 * Written by the kernel, shouldn't be modified by the
173 * application (i.e. get number of "new events" by comparing to
176 * As completion events come in out of order this counter is not
177 * ordered with any other data.
181 * Ring buffer of completion events.
183 * The kernel writes completion events fresh every time they are
184 * produced, so the application is allowed to modify pending
187 struct io_uring_cqe cqes
[] ____cacheline_aligned_in_smp
;
190 enum io_uring_cmd_flags
{
191 IO_URING_F_NONBLOCK
= 1,
192 IO_URING_F_COMPLETE_DEFER
= 2,
195 struct io_mapped_ubuf
{
198 unsigned int nr_bvecs
;
199 unsigned long acct_pages
;
200 struct bio_vec bvec
[];
205 struct io_overflow_cqe
{
206 struct io_uring_cqe cqe
;
207 struct list_head list
;
210 struct io_fixed_file
{
211 /* file * with additional FFS_* flags */
212 unsigned long file_ptr
;
216 struct list_head list
;
221 struct io_mapped_ubuf
*buf
;
225 struct io_file_table
{
226 /* two level table */
227 struct io_fixed_file
**files
;
230 struct io_rsrc_node
{
231 struct percpu_ref refs
;
232 struct list_head node
;
233 struct list_head rsrc_list
;
234 struct io_rsrc_data
*rsrc_data
;
235 struct llist_node llist
;
239 typedef void (rsrc_put_fn
)(struct io_ring_ctx
*ctx
, struct io_rsrc_put
*prsrc
);
241 struct io_rsrc_data
{
242 struct io_ring_ctx
*ctx
;
247 struct completion done
;
252 struct list_head list
;
258 struct io_restriction
{
259 DECLARE_BITMAP(register_op
, IORING_REGISTER_LAST
);
260 DECLARE_BITMAP(sqe_op
, IORING_OP_LAST
);
261 u8 sqe_flags_allowed
;
262 u8 sqe_flags_required
;
267 IO_SQ_THREAD_SHOULD_STOP
= 0,
268 IO_SQ_THREAD_SHOULD_PARK
,
273 atomic_t park_pending
;
276 /* ctx's that are using this sqd */
277 struct list_head ctx_list
;
279 struct task_struct
*thread
;
280 struct wait_queue_head wait
;
282 unsigned sq_thread_idle
;
288 struct completion exited
;
289 struct callback_head
*park_task_work
;
292 #define IO_IOPOLL_BATCH 8
293 #define IO_COMPL_BATCH 32
294 #define IO_REQ_CACHE_SIZE 32
295 #define IO_REQ_ALLOC_BATCH 8
297 struct io_comp_state
{
298 struct io_kiocb
*reqs
[IO_COMPL_BATCH
];
300 unsigned int locked_free_nr
;
301 /* inline/task_work completion list, under ->uring_lock */
302 struct list_head free_list
;
303 /* IRQ completion list, under ->completion_lock */
304 struct list_head locked_free_list
;
307 struct io_submit_link
{
308 struct io_kiocb
*head
;
309 struct io_kiocb
*last
;
312 struct io_submit_state
{
313 struct blk_plug plug
;
314 struct io_submit_link link
;
317 * io_kiocb alloc cache
319 void *reqs
[IO_REQ_CACHE_SIZE
];
320 unsigned int free_reqs
;
325 * Batch completion logic
327 struct io_comp_state comp
;
330 * File reference cache
334 unsigned int file_refs
;
335 unsigned int ios_left
;
340 struct percpu_ref refs
;
341 } ____cacheline_aligned_in_smp
;
345 unsigned int compat
: 1;
346 unsigned int drain_next
: 1;
347 unsigned int eventfd_async
: 1;
348 unsigned int restricted
: 1;
351 * Ring buffer of indices into array of io_uring_sqe, which is
352 * mmapped by the application using the IORING_OFF_SQES offset.
354 * This indirection could e.g. be used to assign fixed
355 * io_uring_sqe entries to operations and only submit them to
356 * the queue when needed.
358 * The kernel modifies neither the indices array nor the entries
362 unsigned cached_sq_head
;
365 unsigned sq_thread_idle
;
366 unsigned cached_sq_dropped
;
367 unsigned cached_cq_overflow
;
368 unsigned long sq_check_overflow
;
370 /* hashed buffered write serialization */
371 struct io_wq_hash
*hash_map
;
373 struct list_head defer_list
;
374 struct list_head timeout_list
;
375 struct list_head cq_overflow_list
;
377 struct io_uring_sqe
*sq_sqes
;
378 } ____cacheline_aligned_in_smp
;
381 struct mutex uring_lock
;
382 wait_queue_head_t wait
;
383 } ____cacheline_aligned_in_smp
;
385 struct io_submit_state submit_state
;
387 struct io_rings
*rings
;
389 /* Only used for accounting purposes */
390 struct mm_struct
*mm_account
;
392 const struct cred
*sq_creds
; /* cred used for __io_sq_thread() */
393 struct io_sq_data
*sq_data
; /* if using sq thread polling */
395 struct wait_queue_head sqo_sq_wait
;
396 struct list_head sqd_list
;
399 * If used, fixed file set. Writers must ensure that ->refs is dead,
400 * readers must ensure that ->refs is alive as long as the file* is
401 * used. Only updated through io_uring_register(2).
403 struct io_rsrc_data
*file_data
;
404 struct io_file_table file_table
;
405 unsigned nr_user_files
;
407 /* if used, fixed mapped user buffers */
408 struct io_rsrc_data
*buf_data
;
409 unsigned nr_user_bufs
;
410 struct io_mapped_ubuf
**user_bufs
;
412 struct user_struct
*user
;
414 struct completion ref_comp
;
416 #if defined(CONFIG_UNIX)
417 struct socket
*ring_sock
;
420 struct xarray io_buffers
;
422 struct xarray personalities
;
426 unsigned cached_cq_tail
;
429 atomic_t cq_timeouts
;
430 unsigned cq_last_tm_flush
;
432 unsigned long cq_check_overflow
;
433 struct wait_queue_head cq_wait
;
434 struct fasync_struct
*cq_fasync
;
435 struct eventfd_ctx
*cq_ev_fd
;
436 } ____cacheline_aligned_in_smp
;
439 spinlock_t completion_lock
;
442 * ->iopoll_list is protected by the ctx->uring_lock for
443 * io_uring instances that don't use IORING_SETUP_SQPOLL.
444 * For SQPOLL, only the single threaded io_sq_thread() will
445 * manipulate the list, hence no extra locking is needed there.
447 struct list_head iopoll_list
;
448 struct hlist_head
*cancel_hash
;
449 unsigned cancel_hash_bits
;
450 bool poll_multi_file
;
451 } ____cacheline_aligned_in_smp
;
453 struct delayed_work rsrc_put_work
;
454 struct llist_head rsrc_put_llist
;
455 struct list_head rsrc_ref_list
;
456 spinlock_t rsrc_ref_lock
;
457 struct io_rsrc_node
*rsrc_node
;
458 struct io_rsrc_node
*rsrc_backup_node
;
459 struct io_mapped_ubuf
*dummy_ubuf
;
461 struct io_restriction restrictions
;
464 struct callback_head
*exit_task_work
;
466 /* Keep this last, we don't need it for the fast path */
467 struct work_struct exit_work
;
468 struct list_head tctx_list
;
471 struct io_uring_task
{
472 /* submission side */
474 struct wait_queue_head wait
;
475 const struct io_ring_ctx
*last
;
477 struct percpu_counter inflight
;
478 atomic_t inflight_tracked
;
481 spinlock_t task_lock
;
482 struct io_wq_work_list task_list
;
483 unsigned long task_state
;
484 struct callback_head task_work
;
488 * First field must be the file pointer in all the
489 * iocb unions! See also 'struct kiocb' in <linux/fs.h>
491 struct io_poll_iocb
{
493 struct wait_queue_head
*head
;
497 struct wait_queue_entry wait
;
500 struct io_poll_update
{
506 bool update_user_data
;
514 struct io_timeout_data
{
515 struct io_kiocb
*req
;
516 struct hrtimer timer
;
517 struct timespec64 ts
;
518 enum hrtimer_mode mode
;
523 struct sockaddr __user
*addr
;
524 int __user
*addr_len
;
526 unsigned long nofile
;
546 struct list_head list
;
547 /* head of the link, used by linked timeouts only */
548 struct io_kiocb
*head
;
551 struct io_timeout_rem
{
556 struct timespec64 ts
;
561 /* NOTE: kiocb has the file as the first member, so don't do it here */
569 struct sockaddr __user
*addr
;
576 struct compat_msghdr __user
*umsg_compat
;
577 struct user_msghdr __user
*umsg
;
583 struct io_buffer
*kbuf
;
589 struct filename
*filename
;
591 unsigned long nofile
;
594 struct io_rsrc_update
{
620 struct epoll_event event
;
624 struct file
*file_out
;
625 struct file
*file_in
;
632 struct io_provide_buf
{
646 const char __user
*filename
;
647 struct statx __user
*buffer
;
659 struct filename
*oldpath
;
660 struct filename
*newpath
;
668 struct filename
*filename
;
671 struct io_completion
{
673 struct list_head list
;
677 struct io_async_connect
{
678 struct sockaddr_storage address
;
681 struct io_async_msghdr
{
682 struct iovec fast_iov
[UIO_FASTIOV
];
683 /* points to an allocated iov, if NULL we use fast_iov instead */
684 struct iovec
*free_iov
;
685 struct sockaddr __user
*uaddr
;
687 struct sockaddr_storage addr
;
691 struct iovec fast_iov
[UIO_FASTIOV
];
692 const struct iovec
*free_iovec
;
693 struct iov_iter iter
;
695 struct wait_page_queue wpq
;
699 REQ_F_FIXED_FILE_BIT
= IOSQE_FIXED_FILE_BIT
,
700 REQ_F_IO_DRAIN_BIT
= IOSQE_IO_DRAIN_BIT
,
701 REQ_F_LINK_BIT
= IOSQE_IO_LINK_BIT
,
702 REQ_F_HARDLINK_BIT
= IOSQE_IO_HARDLINK_BIT
,
703 REQ_F_FORCE_ASYNC_BIT
= IOSQE_ASYNC_BIT
,
704 REQ_F_BUFFER_SELECT_BIT
= IOSQE_BUFFER_SELECT_BIT
,
706 /* first byte is taken by user flags, shift it to not overlap */
707 REQ_F_FAIL_LINK_BIT
= 8,
711 REQ_F_LINK_TIMEOUT_BIT
,
712 REQ_F_NEED_CLEANUP_BIT
,
714 REQ_F_BUFFER_SELECTED_BIT
,
715 REQ_F_LTIMEOUT_ACTIVE_BIT
,
716 REQ_F_COMPLETE_INLINE_BIT
,
718 REQ_F_DONT_REISSUE_BIT
,
719 /* keep async read/write and isreg together and in order */
720 REQ_F_ASYNC_READ_BIT
,
721 REQ_F_ASYNC_WRITE_BIT
,
724 /* not a real bit, just to check we're not overflowing the space */
730 REQ_F_FIXED_FILE
= BIT(REQ_F_FIXED_FILE_BIT
),
731 /* drain existing IO first */
732 REQ_F_IO_DRAIN
= BIT(REQ_F_IO_DRAIN_BIT
),
734 REQ_F_LINK
= BIT(REQ_F_LINK_BIT
),
735 /* doesn't sever on completion < 0 */
736 REQ_F_HARDLINK
= BIT(REQ_F_HARDLINK_BIT
),
738 REQ_F_FORCE_ASYNC
= BIT(REQ_F_FORCE_ASYNC_BIT
),
739 /* IOSQE_BUFFER_SELECT */
740 REQ_F_BUFFER_SELECT
= BIT(REQ_F_BUFFER_SELECT_BIT
),
742 /* fail rest of links */
743 REQ_F_FAIL_LINK
= BIT(REQ_F_FAIL_LINK_BIT
),
744 /* on inflight list, should be cancelled and waited on exit reliably */
745 REQ_F_INFLIGHT
= BIT(REQ_F_INFLIGHT_BIT
),
746 /* read/write uses file position */
747 REQ_F_CUR_POS
= BIT(REQ_F_CUR_POS_BIT
),
748 /* must not punt to workers */
749 REQ_F_NOWAIT
= BIT(REQ_F_NOWAIT_BIT
),
750 /* has or had linked timeout */
751 REQ_F_LINK_TIMEOUT
= BIT(REQ_F_LINK_TIMEOUT_BIT
),
753 REQ_F_NEED_CLEANUP
= BIT(REQ_F_NEED_CLEANUP_BIT
),
754 /* already went through poll handler */
755 REQ_F_POLLED
= BIT(REQ_F_POLLED_BIT
),
756 /* buffer already selected */
757 REQ_F_BUFFER_SELECTED
= BIT(REQ_F_BUFFER_SELECTED_BIT
),
758 /* linked timeout is active, i.e. prepared by link's head */
759 REQ_F_LTIMEOUT_ACTIVE
= BIT(REQ_F_LTIMEOUT_ACTIVE_BIT
),
760 /* completion is deferred through io_comp_state */
761 REQ_F_COMPLETE_INLINE
= BIT(REQ_F_COMPLETE_INLINE_BIT
),
762 /* caller should reissue async */
763 REQ_F_REISSUE
= BIT(REQ_F_REISSUE_BIT
),
764 /* don't attempt request reissue, see io_rw_reissue() */
765 REQ_F_DONT_REISSUE
= BIT(REQ_F_DONT_REISSUE_BIT
),
766 /* supports async reads */
767 REQ_F_ASYNC_READ
= BIT(REQ_F_ASYNC_READ_BIT
),
768 /* supports async writes */
769 REQ_F_ASYNC_WRITE
= BIT(REQ_F_ASYNC_WRITE_BIT
),
771 REQ_F_ISREG
= BIT(REQ_F_ISREG_BIT
),
775 struct io_poll_iocb poll
;
776 struct io_poll_iocb
*double_poll
;
779 struct io_task_work
{
780 struct io_wq_work_node node
;
781 task_work_func_t func
;
785 * NOTE! Each of the iocb union members has the file pointer
786 * as the first entry in their struct definition. So you can
787 * access the file pointer through any of the sub-structs,
788 * or directly as just 'ki_filp' in this struct.
794 struct io_poll_iocb poll
;
795 struct io_poll_update poll_update
;
796 struct io_accept accept
;
798 struct io_cancel cancel
;
799 struct io_timeout timeout
;
800 struct io_timeout_rem timeout_rem
;
801 struct io_connect connect
;
802 struct io_sr_msg sr_msg
;
804 struct io_close close
;
805 struct io_rsrc_update rsrc_update
;
806 struct io_fadvise fadvise
;
807 struct io_madvise madvise
;
808 struct io_epoll epoll
;
809 struct io_splice splice
;
810 struct io_provide_buf pbuf
;
811 struct io_statx statx
;
812 struct io_shutdown shutdown
;
813 struct io_rename rename
;
814 struct io_unlink unlink
;
815 /* use only after cleaning per-op data, see io_clean_op() */
816 struct io_completion
compl;
819 /* opcode allocated if it needs to store data for async defer */
822 /* polled IO has completed */
828 struct io_ring_ctx
*ctx
;
831 struct task_struct
*task
;
834 struct io_kiocb
*link
;
835 struct percpu_ref
*fixed_rsrc_refs
;
837 /* used with ctx->iopoll_list with reads/writes */
838 struct list_head inflight_entry
;
840 struct io_task_work io_task_work
;
841 struct callback_head task_work
;
843 /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
844 struct hlist_node hash_node
;
845 struct async_poll
*apoll
;
846 struct io_wq_work work
;
847 /* store used ubuf, so we can prevent reloading */
848 struct io_mapped_ubuf
*imu
;
851 struct io_tctx_node
{
852 struct list_head ctx_node
;
853 struct task_struct
*task
;
854 struct io_ring_ctx
*ctx
;
857 struct io_defer_entry
{
858 struct list_head list
;
859 struct io_kiocb
*req
;
864 /* needs req->file assigned */
865 unsigned needs_file
: 1;
866 /* hash wq insertion if file is a regular file */
867 unsigned hash_reg_file
: 1;
868 /* unbound wq insertion if file is a non-regular file */
869 unsigned unbound_nonreg_file
: 1;
870 /* opcode is not supported by this kernel */
871 unsigned not_supported
: 1;
872 /* set if opcode supports polled "wait" */
874 unsigned pollout
: 1;
875 /* op supports buffer selection */
876 unsigned buffer_select
: 1;
877 /* do prep async if is going to be punted */
878 unsigned needs_async_setup
: 1;
879 /* should block plug */
881 /* size of async data needed, if any */
882 unsigned short async_size
;
885 static const struct io_op_def io_op_defs
[] = {
886 [IORING_OP_NOP
] = {},
887 [IORING_OP_READV
] = {
889 .unbound_nonreg_file
= 1,
892 .needs_async_setup
= 1,
894 .async_size
= sizeof(struct io_async_rw
),
896 [IORING_OP_WRITEV
] = {
899 .unbound_nonreg_file
= 1,
901 .needs_async_setup
= 1,
903 .async_size
= sizeof(struct io_async_rw
),
905 [IORING_OP_FSYNC
] = {
908 [IORING_OP_READ_FIXED
] = {
910 .unbound_nonreg_file
= 1,
913 .async_size
= sizeof(struct io_async_rw
),
915 [IORING_OP_WRITE_FIXED
] = {
918 .unbound_nonreg_file
= 1,
921 .async_size
= sizeof(struct io_async_rw
),
923 [IORING_OP_POLL_ADD
] = {
925 .unbound_nonreg_file
= 1,
927 [IORING_OP_POLL_REMOVE
] = {},
928 [IORING_OP_SYNC_FILE_RANGE
] = {
931 [IORING_OP_SENDMSG
] = {
933 .unbound_nonreg_file
= 1,
935 .needs_async_setup
= 1,
936 .async_size
= sizeof(struct io_async_msghdr
),
938 [IORING_OP_RECVMSG
] = {
940 .unbound_nonreg_file
= 1,
943 .needs_async_setup
= 1,
944 .async_size
= sizeof(struct io_async_msghdr
),
946 [IORING_OP_TIMEOUT
] = {
947 .async_size
= sizeof(struct io_timeout_data
),
949 [IORING_OP_TIMEOUT_REMOVE
] = {
950 /* used by timeout updates' prep() */
952 [IORING_OP_ACCEPT
] = {
954 .unbound_nonreg_file
= 1,
957 [IORING_OP_ASYNC_CANCEL
] = {},
958 [IORING_OP_LINK_TIMEOUT
] = {
959 .async_size
= sizeof(struct io_timeout_data
),
961 [IORING_OP_CONNECT
] = {
963 .unbound_nonreg_file
= 1,
965 .needs_async_setup
= 1,
966 .async_size
= sizeof(struct io_async_connect
),
968 [IORING_OP_FALLOCATE
] = {
971 [IORING_OP_OPENAT
] = {},
972 [IORING_OP_CLOSE
] = {},
973 [IORING_OP_FILES_UPDATE
] = {},
974 [IORING_OP_STATX
] = {},
977 .unbound_nonreg_file
= 1,
981 .async_size
= sizeof(struct io_async_rw
),
983 [IORING_OP_WRITE
] = {
985 .unbound_nonreg_file
= 1,
988 .async_size
= sizeof(struct io_async_rw
),
990 [IORING_OP_FADVISE
] = {
993 [IORING_OP_MADVISE
] = {},
996 .unbound_nonreg_file
= 1,
1001 .unbound_nonreg_file
= 1,
1005 [IORING_OP_OPENAT2
] = {
1007 [IORING_OP_EPOLL_CTL
] = {
1008 .unbound_nonreg_file
= 1,
1010 [IORING_OP_SPLICE
] = {
1013 .unbound_nonreg_file
= 1,
1015 [IORING_OP_PROVIDE_BUFFERS
] = {},
1016 [IORING_OP_REMOVE_BUFFERS
] = {},
1020 .unbound_nonreg_file
= 1,
1022 [IORING_OP_SHUTDOWN
] = {
1025 [IORING_OP_RENAMEAT
] = {},
1026 [IORING_OP_UNLINKAT
] = {},
1029 static bool io_disarm_next(struct io_kiocb
*req
);
1030 static void io_uring_del_task_file(unsigned long index
);
1031 static void io_uring_try_cancel_requests(struct io_ring_ctx
*ctx
,
1032 struct task_struct
*task
,
1033 struct files_struct
*files
);
1034 static void io_uring_cancel_sqpoll(struct io_sq_data
*sqd
);
1035 static struct io_rsrc_node
*io_rsrc_node_alloc(struct io_ring_ctx
*ctx
);
1037 static bool io_cqring_fill_event(struct io_ring_ctx
*ctx
, u64 user_data
,
1038 long res
, unsigned int cflags
);
1039 static void io_put_req(struct io_kiocb
*req
);
1040 static void io_put_req_deferred(struct io_kiocb
*req
, int nr
);
1041 static void io_dismantle_req(struct io_kiocb
*req
);
1042 static void io_put_task(struct task_struct
*task
, int nr
);
1043 static struct io_kiocb
*io_prep_linked_timeout(struct io_kiocb
*req
);
1044 static void io_queue_linked_timeout(struct io_kiocb
*req
);
1045 static int __io_register_rsrc_update(struct io_ring_ctx
*ctx
, unsigned type
,
1046 struct io_uring_rsrc_update2
*up
,
1048 static void io_clean_op(struct io_kiocb
*req
);
1049 static struct file
*io_file_get(struct io_submit_state
*state
,
1050 struct io_kiocb
*req
, int fd
, bool fixed
);
1051 static void __io_queue_sqe(struct io_kiocb
*req
);
1052 static void io_rsrc_put_work(struct work_struct
*work
);
1054 static void io_req_task_queue(struct io_kiocb
*req
);
1055 static void io_submit_flush_completions(struct io_comp_state
*cs
,
1056 struct io_ring_ctx
*ctx
);
1057 static bool io_poll_remove_waitqs(struct io_kiocb
*req
);
1058 static int io_req_prep_async(struct io_kiocb
*req
);
1060 static struct kmem_cache
*req_cachep
;
1062 static const struct file_operations io_uring_fops
;
1064 struct sock
*io_uring_get_socket(struct file
*file
)
1066 #if defined(CONFIG_UNIX)
1067 if (file
->f_op
== &io_uring_fops
) {
1068 struct io_ring_ctx
*ctx
= file
->private_data
;
1070 return ctx
->ring_sock
->sk
;
1075 EXPORT_SYMBOL(io_uring_get_socket
);
1077 #define io_for_each_link(pos, head) \
1078 for (pos = (head); pos; pos = pos->link)
1080 static inline void io_req_set_rsrc_node(struct io_kiocb
*req
)
1082 struct io_ring_ctx
*ctx
= req
->ctx
;
1084 if (!req
->fixed_rsrc_refs
) {
1085 req
->fixed_rsrc_refs
= &ctx
->rsrc_node
->refs
;
1086 percpu_ref_get(req
->fixed_rsrc_refs
);
1090 static void io_refs_resurrect(struct percpu_ref
*ref
, struct completion
*compl)
1092 bool got
= percpu_ref_tryget(ref
);
1094 /* already at zero, wait for ->release() */
1096 wait_for_completion(compl);
1097 percpu_ref_resurrect(ref
);
1099 percpu_ref_put(ref
);
1102 static bool io_match_task(struct io_kiocb
*head
,
1103 struct task_struct
*task
,
1104 struct files_struct
*files
)
1106 struct io_kiocb
*req
;
1108 if (task
&& head
->task
!= task
)
1113 io_for_each_link(req
, head
) {
1114 if (req
->flags
& REQ_F_INFLIGHT
)
1120 static inline void req_set_fail_links(struct io_kiocb
*req
)
1122 if (req
->flags
& REQ_F_LINK
)
1123 req
->flags
|= REQ_F_FAIL_LINK
;
1126 static void io_ring_ctx_ref_free(struct percpu_ref
*ref
)
1128 struct io_ring_ctx
*ctx
= container_of(ref
, struct io_ring_ctx
, refs
);
1130 complete(&ctx
->ref_comp
);
1133 static inline bool io_is_timeout_noseq(struct io_kiocb
*req
)
1135 return !req
->timeout
.off
;
1138 static struct io_ring_ctx
*io_ring_ctx_alloc(struct io_uring_params
*p
)
1140 struct io_ring_ctx
*ctx
;
1143 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
1148 * Use 5 bits less than the max cq entries, that should give us around
1149 * 32 entries per hash list if totally full and uniformly spread.
1151 hash_bits
= ilog2(p
->cq_entries
);
1155 ctx
->cancel_hash_bits
= hash_bits
;
1156 ctx
->cancel_hash
= kmalloc((1U << hash_bits
) * sizeof(struct hlist_head
),
1158 if (!ctx
->cancel_hash
)
1160 __hash_init(ctx
->cancel_hash
, 1U << hash_bits
);
1162 ctx
->dummy_ubuf
= kzalloc(sizeof(*ctx
->dummy_ubuf
), GFP_KERNEL
);
1163 if (!ctx
->dummy_ubuf
)
1165 /* set invalid range, so io_import_fixed() fails meeting it */
1166 ctx
->dummy_ubuf
->ubuf
= -1UL;
1168 if (percpu_ref_init(&ctx
->refs
, io_ring_ctx_ref_free
,
1169 PERCPU_REF_ALLOW_REINIT
, GFP_KERNEL
))
1172 ctx
->flags
= p
->flags
;
1173 init_waitqueue_head(&ctx
->sqo_sq_wait
);
1174 INIT_LIST_HEAD(&ctx
->sqd_list
);
1175 init_waitqueue_head(&ctx
->cq_wait
);
1176 INIT_LIST_HEAD(&ctx
->cq_overflow_list
);
1177 init_completion(&ctx
->ref_comp
);
1178 xa_init_flags(&ctx
->io_buffers
, XA_FLAGS_ALLOC1
);
1179 xa_init_flags(&ctx
->personalities
, XA_FLAGS_ALLOC1
);
1180 mutex_init(&ctx
->uring_lock
);
1181 init_waitqueue_head(&ctx
->wait
);
1182 spin_lock_init(&ctx
->completion_lock
);
1183 INIT_LIST_HEAD(&ctx
->iopoll_list
);
1184 INIT_LIST_HEAD(&ctx
->defer_list
);
1185 INIT_LIST_HEAD(&ctx
->timeout_list
);
1186 spin_lock_init(&ctx
->rsrc_ref_lock
);
1187 INIT_LIST_HEAD(&ctx
->rsrc_ref_list
);
1188 INIT_DELAYED_WORK(&ctx
->rsrc_put_work
, io_rsrc_put_work
);
1189 init_llist_head(&ctx
->rsrc_put_llist
);
1190 INIT_LIST_HEAD(&ctx
->tctx_list
);
1191 INIT_LIST_HEAD(&ctx
->submit_state
.comp
.free_list
);
1192 INIT_LIST_HEAD(&ctx
->submit_state
.comp
.locked_free_list
);
1195 kfree(ctx
->dummy_ubuf
);
1196 kfree(ctx
->cancel_hash
);
1201 static bool req_need_defer(struct io_kiocb
*req
, u32 seq
)
1203 if (unlikely(req
->flags
& REQ_F_IO_DRAIN
)) {
1204 struct io_ring_ctx
*ctx
= req
->ctx
;
1206 return seq
+ ctx
->cq_extra
!= ctx
->cached_cq_tail
1207 + READ_ONCE(ctx
->cached_cq_overflow
);
1213 static void io_req_track_inflight(struct io_kiocb
*req
)
1215 if (!(req
->flags
& REQ_F_INFLIGHT
)) {
1216 req
->flags
|= REQ_F_INFLIGHT
;
1217 atomic_inc(¤t
->io_uring
->inflight_tracked
);
1221 static void io_prep_async_work(struct io_kiocb
*req
)
1223 const struct io_op_def
*def
= &io_op_defs
[req
->opcode
];
1224 struct io_ring_ctx
*ctx
= req
->ctx
;
1226 if (!req
->work
.creds
)
1227 req
->work
.creds
= get_current_cred();
1229 req
->work
.list
.next
= NULL
;
1230 req
->work
.flags
= 0;
1231 if (req
->flags
& REQ_F_FORCE_ASYNC
)
1232 req
->work
.flags
|= IO_WQ_WORK_CONCURRENT
;
1234 if (req
->flags
& REQ_F_ISREG
) {
1235 if (def
->hash_reg_file
|| (ctx
->flags
& IORING_SETUP_IOPOLL
))
1236 io_wq_hash_work(&req
->work
, file_inode(req
->file
));
1237 } else if (!req
->file
|| !S_ISBLK(file_inode(req
->file
)->i_mode
)) {
1238 if (def
->unbound_nonreg_file
)
1239 req
->work
.flags
|= IO_WQ_WORK_UNBOUND
;
1242 switch (req
->opcode
) {
1243 case IORING_OP_SPLICE
:
1245 if (!S_ISREG(file_inode(req
->splice
.file_in
)->i_mode
))
1246 req
->work
.flags
|= IO_WQ_WORK_UNBOUND
;
1251 static void io_prep_async_link(struct io_kiocb
*req
)
1253 struct io_kiocb
*cur
;
1255 io_for_each_link(cur
, req
)
1256 io_prep_async_work(cur
);
1259 static void io_queue_async_work(struct io_kiocb
*req
)
1261 struct io_ring_ctx
*ctx
= req
->ctx
;
1262 struct io_kiocb
*link
= io_prep_linked_timeout(req
);
1263 struct io_uring_task
*tctx
= req
->task
->io_uring
;
1266 BUG_ON(!tctx
->io_wq
);
1268 /* init ->work of the whole link before punting */
1269 io_prep_async_link(req
);
1270 trace_io_uring_queue_async_work(ctx
, io_wq_is_hashed(&req
->work
), req
,
1271 &req
->work
, req
->flags
);
1272 io_wq_enqueue(tctx
->io_wq
, &req
->work
);
1274 io_queue_linked_timeout(link
);
1277 static void io_kill_timeout(struct io_kiocb
*req
, int status
)
1278 __must_hold(&req
->ctx
->completion_lock
)
1280 struct io_timeout_data
*io
= req
->async_data
;
1282 if (hrtimer_try_to_cancel(&io
->timer
) != -1) {
1283 atomic_set(&req
->ctx
->cq_timeouts
,
1284 atomic_read(&req
->ctx
->cq_timeouts
) + 1);
1285 list_del_init(&req
->timeout
.list
);
1286 io_cqring_fill_event(req
->ctx
, req
->user_data
, status
, 0);
1287 io_put_req_deferred(req
, 1);
1291 static void __io_queue_deferred(struct io_ring_ctx
*ctx
)
1294 struct io_defer_entry
*de
= list_first_entry(&ctx
->defer_list
,
1295 struct io_defer_entry
, list
);
1297 if (req_need_defer(de
->req
, de
->seq
))
1299 list_del_init(&de
->list
);
1300 io_req_task_queue(de
->req
);
1302 } while (!list_empty(&ctx
->defer_list
));
1305 static void io_flush_timeouts(struct io_ring_ctx
*ctx
)
1309 if (list_empty(&ctx
->timeout_list
))
1312 seq
= ctx
->cached_cq_tail
- atomic_read(&ctx
->cq_timeouts
);
1315 u32 events_needed
, events_got
;
1316 struct io_kiocb
*req
= list_first_entry(&ctx
->timeout_list
,
1317 struct io_kiocb
, timeout
.list
);
1319 if (io_is_timeout_noseq(req
))
1323 * Since seq can easily wrap around over time, subtract
1324 * the last seq at which timeouts were flushed before comparing.
1325 * Assuming not more than 2^31-1 events have happened since,
1326 * these subtractions won't have wrapped, so we can check if
1327 * target is in [last_seq, current_seq] by comparing the two.
1329 events_needed
= req
->timeout
.target_seq
- ctx
->cq_last_tm_flush
;
1330 events_got
= seq
- ctx
->cq_last_tm_flush
;
1331 if (events_got
< events_needed
)
1334 list_del_init(&req
->timeout
.list
);
1335 io_kill_timeout(req
, 0);
1336 } while (!list_empty(&ctx
->timeout_list
));
1338 ctx
->cq_last_tm_flush
= seq
;
1341 static void io_commit_cqring(struct io_ring_ctx
*ctx
)
1343 io_flush_timeouts(ctx
);
1345 /* order cqe stores with ring update */
1346 smp_store_release(&ctx
->rings
->cq
.tail
, ctx
->cached_cq_tail
);
1348 if (unlikely(!list_empty(&ctx
->defer_list
)))
1349 __io_queue_deferred(ctx
);
1352 static inline bool io_sqring_full(struct io_ring_ctx
*ctx
)
1354 struct io_rings
*r
= ctx
->rings
;
1356 return READ_ONCE(r
->sq
.tail
) - ctx
->cached_sq_head
== r
->sq_ring_entries
;
1359 static inline unsigned int __io_cqring_events(struct io_ring_ctx
*ctx
)
1361 return ctx
->cached_cq_tail
- READ_ONCE(ctx
->rings
->cq
.head
);
1364 static inline struct io_uring_cqe
*io_get_cqring(struct io_ring_ctx
*ctx
)
1366 struct io_rings
*rings
= ctx
->rings
;
1370 * writes to the cq entry need to come after reading head; the
1371 * control dependency is enough as we're using WRITE_ONCE to
1374 if (__io_cqring_events(ctx
) == rings
->cq_ring_entries
)
1377 tail
= ctx
->cached_cq_tail
++;
1378 return &rings
->cqes
[tail
& ctx
->cq_mask
];
1381 static inline bool io_should_trigger_evfd(struct io_ring_ctx
*ctx
)
1383 if (likely(!ctx
->cq_ev_fd
))
1385 if (READ_ONCE(ctx
->rings
->cq_flags
) & IORING_CQ_EVENTFD_DISABLED
)
1387 return !ctx
->eventfd_async
|| io_wq_current_is_worker();
1390 static void io_cqring_ev_posted(struct io_ring_ctx
*ctx
)
1392 /* see waitqueue_active() comment */
1395 if (waitqueue_active(&ctx
->wait
))
1396 wake_up(&ctx
->wait
);
1397 if (ctx
->sq_data
&& waitqueue_active(&ctx
->sq_data
->wait
))
1398 wake_up(&ctx
->sq_data
->wait
);
1399 if (io_should_trigger_evfd(ctx
))
1400 eventfd_signal(ctx
->cq_ev_fd
, 1);
1401 if (waitqueue_active(&ctx
->cq_wait
)) {
1402 wake_up_interruptible(&ctx
->cq_wait
);
1403 kill_fasync(&ctx
->cq_fasync
, SIGIO
, POLL_IN
);
1407 static void io_cqring_ev_posted_iopoll(struct io_ring_ctx
*ctx
)
1409 /* see waitqueue_active() comment */
1412 if (ctx
->flags
& IORING_SETUP_SQPOLL
) {
1413 if (waitqueue_active(&ctx
->wait
))
1414 wake_up(&ctx
->wait
);
1416 if (io_should_trigger_evfd(ctx
))
1417 eventfd_signal(ctx
->cq_ev_fd
, 1);
1418 if (waitqueue_active(&ctx
->cq_wait
)) {
1419 wake_up_interruptible(&ctx
->cq_wait
);
1420 kill_fasync(&ctx
->cq_fasync
, SIGIO
, POLL_IN
);
1424 /* Returns true if there are no backlogged entries after the flush */
1425 static bool __io_cqring_overflow_flush(struct io_ring_ctx
*ctx
, bool force
)
1427 struct io_rings
*rings
= ctx
->rings
;
1428 unsigned long flags
;
1429 bool all_flushed
, posted
;
1431 if (!force
&& __io_cqring_events(ctx
) == rings
->cq_ring_entries
)
1435 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
1436 while (!list_empty(&ctx
->cq_overflow_list
)) {
1437 struct io_uring_cqe
*cqe
= io_get_cqring(ctx
);
1438 struct io_overflow_cqe
*ocqe
;
1442 ocqe
= list_first_entry(&ctx
->cq_overflow_list
,
1443 struct io_overflow_cqe
, list
);
1445 memcpy(cqe
, &ocqe
->cqe
, sizeof(*cqe
));
1447 WRITE_ONCE(ctx
->rings
->cq_overflow
,
1448 ++ctx
->cached_cq_overflow
);
1450 list_del(&ocqe
->list
);
1454 all_flushed
= list_empty(&ctx
->cq_overflow_list
);
1456 clear_bit(0, &ctx
->sq_check_overflow
);
1457 clear_bit(0, &ctx
->cq_check_overflow
);
1458 ctx
->rings
->sq_flags
&= ~IORING_SQ_CQ_OVERFLOW
;
1462 io_commit_cqring(ctx
);
1463 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
1465 io_cqring_ev_posted(ctx
);
1469 static bool io_cqring_overflow_flush(struct io_ring_ctx
*ctx
, bool force
)
1473 if (test_bit(0, &ctx
->cq_check_overflow
)) {
1474 /* iopoll syncs against uring_lock, not completion_lock */
1475 if (ctx
->flags
& IORING_SETUP_IOPOLL
)
1476 mutex_lock(&ctx
->uring_lock
);
1477 ret
= __io_cqring_overflow_flush(ctx
, force
);
1478 if (ctx
->flags
& IORING_SETUP_IOPOLL
)
1479 mutex_unlock(&ctx
->uring_lock
);
1486 * Shamelessly stolen from the mm implementation of page reference checking,
1487 * see commit f958d7b528b1 for details.
1489 #define req_ref_zero_or_close_to_overflow(req) \
1490 ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u)
1492 static inline bool req_ref_inc_not_zero(struct io_kiocb
*req
)
1494 return atomic_inc_not_zero(&req
->refs
);
1497 static inline bool req_ref_sub_and_test(struct io_kiocb
*req
, int refs
)
1499 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req
));
1500 return atomic_sub_and_test(refs
, &req
->refs
);
1503 static inline bool req_ref_put_and_test(struct io_kiocb
*req
)
1505 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req
));
1506 return atomic_dec_and_test(&req
->refs
);
1509 static inline void req_ref_put(struct io_kiocb
*req
)
1511 WARN_ON_ONCE(req_ref_put_and_test(req
));
1514 static inline void req_ref_get(struct io_kiocb
*req
)
1516 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req
));
1517 atomic_inc(&req
->refs
);
1520 static bool io_cqring_event_overflow(struct io_ring_ctx
*ctx
, u64 user_data
,
1521 long res
, unsigned int cflags
)
1523 struct io_overflow_cqe
*ocqe
;
1525 ocqe
= kmalloc(sizeof(*ocqe
), GFP_ATOMIC
| __GFP_ACCOUNT
);
1528 * If we're in ring overflow flush mode, or in task cancel mode,
1529 * or cannot allocate an overflow entry, then we need to drop it
1532 WRITE_ONCE(ctx
->rings
->cq_overflow
, ++ctx
->cached_cq_overflow
);
1535 if (list_empty(&ctx
->cq_overflow_list
)) {
1536 set_bit(0, &ctx
->sq_check_overflow
);
1537 set_bit(0, &ctx
->cq_check_overflow
);
1538 ctx
->rings
->sq_flags
|= IORING_SQ_CQ_OVERFLOW
;
1540 ocqe
->cqe
.user_data
= user_data
;
1541 ocqe
->cqe
.res
= res
;
1542 ocqe
->cqe
.flags
= cflags
;
1543 list_add_tail(&ocqe
->list
, &ctx
->cq_overflow_list
);
1547 static inline bool __io_cqring_fill_event(struct io_ring_ctx
*ctx
, u64 user_data
,
1548 long res
, unsigned int cflags
)
1550 struct io_uring_cqe
*cqe
;
1552 trace_io_uring_complete(ctx
, user_data
, res
, cflags
);
1555 * If we can't get a cq entry, userspace overflowed the
1556 * submission (by quite a lot). Increment the overflow count in
1559 cqe
= io_get_cqring(ctx
);
1561 WRITE_ONCE(cqe
->user_data
, user_data
);
1562 WRITE_ONCE(cqe
->res
, res
);
1563 WRITE_ONCE(cqe
->flags
, cflags
);
1566 return io_cqring_event_overflow(ctx
, user_data
, res
, cflags
);
1569 /* not as hot to bloat with inlining */
1570 static noinline
bool io_cqring_fill_event(struct io_ring_ctx
*ctx
, u64 user_data
,
1571 long res
, unsigned int cflags
)
1573 return __io_cqring_fill_event(ctx
, user_data
, res
, cflags
);
1576 static void io_req_complete_post(struct io_kiocb
*req
, long res
,
1577 unsigned int cflags
)
1579 struct io_ring_ctx
*ctx
= req
->ctx
;
1580 unsigned long flags
;
1582 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
1583 __io_cqring_fill_event(ctx
, req
->user_data
, res
, cflags
);
1585 * If we're the last reference to this request, add to our locked
1588 if (req_ref_put_and_test(req
)) {
1589 struct io_comp_state
*cs
= &ctx
->submit_state
.comp
;
1591 if (req
->flags
& (REQ_F_LINK
| REQ_F_HARDLINK
)) {
1592 if (req
->flags
& (REQ_F_LINK_TIMEOUT
| REQ_F_FAIL_LINK
))
1593 io_disarm_next(req
);
1595 io_req_task_queue(req
->link
);
1599 io_dismantle_req(req
);
1600 io_put_task(req
->task
, 1);
1601 list_add(&req
->compl.list
, &cs
->locked_free_list
);
1602 cs
->locked_free_nr
++;
1604 if (!percpu_ref_tryget(&ctx
->refs
))
1607 io_commit_cqring(ctx
);
1608 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
1611 io_cqring_ev_posted(ctx
);
1612 percpu_ref_put(&ctx
->refs
);
1616 static inline bool io_req_needs_clean(struct io_kiocb
*req
)
1618 return req
->flags
& (REQ_F_BUFFER_SELECTED
| REQ_F_NEED_CLEANUP
|
1619 REQ_F_POLLED
| REQ_F_INFLIGHT
);
1622 static void io_req_complete_state(struct io_kiocb
*req
, long res
,
1623 unsigned int cflags
)
1625 if (io_req_needs_clean(req
))
1628 req
->compl.cflags
= cflags
;
1629 req
->flags
|= REQ_F_COMPLETE_INLINE
;
1632 static inline void __io_req_complete(struct io_kiocb
*req
, unsigned issue_flags
,
1633 long res
, unsigned cflags
)
1635 if (issue_flags
& IO_URING_F_COMPLETE_DEFER
)
1636 io_req_complete_state(req
, res
, cflags
);
1638 io_req_complete_post(req
, res
, cflags
);
1641 static inline void io_req_complete(struct io_kiocb
*req
, long res
)
1643 __io_req_complete(req
, 0, res
, 0);
1646 static void io_req_complete_failed(struct io_kiocb
*req
, long res
)
1648 req_set_fail_links(req
);
1650 io_req_complete_post(req
, res
, 0);
1653 static void io_flush_cached_locked_reqs(struct io_ring_ctx
*ctx
,
1654 struct io_comp_state
*cs
)
1656 spin_lock_irq(&ctx
->completion_lock
);
1657 list_splice_init(&cs
->locked_free_list
, &cs
->free_list
);
1658 cs
->locked_free_nr
= 0;
1659 spin_unlock_irq(&ctx
->completion_lock
);
1662 /* Returns true IFF there are requests in the cache */
1663 static bool io_flush_cached_reqs(struct io_ring_ctx
*ctx
)
1665 struct io_submit_state
*state
= &ctx
->submit_state
;
1666 struct io_comp_state
*cs
= &state
->comp
;
1670 * If we have more than a batch's worth of requests in our IRQ side
1671 * locked cache, grab the lock and move them over to our submission
1674 if (READ_ONCE(cs
->locked_free_nr
) > IO_COMPL_BATCH
)
1675 io_flush_cached_locked_reqs(ctx
, cs
);
1677 nr
= state
->free_reqs
;
1678 while (!list_empty(&cs
->free_list
)) {
1679 struct io_kiocb
*req
= list_first_entry(&cs
->free_list
,
1680 struct io_kiocb
, compl.list
);
1682 list_del(&req
->compl.list
);
1683 state
->reqs
[nr
++] = req
;
1684 if (nr
== ARRAY_SIZE(state
->reqs
))
1688 state
->free_reqs
= nr
;
1692 static struct io_kiocb
*io_alloc_req(struct io_ring_ctx
*ctx
)
1694 struct io_submit_state
*state
= &ctx
->submit_state
;
1696 BUILD_BUG_ON(IO_REQ_ALLOC_BATCH
> ARRAY_SIZE(state
->reqs
));
1698 if (!state
->free_reqs
) {
1699 gfp_t gfp
= GFP_KERNEL
| __GFP_NOWARN
;
1702 if (io_flush_cached_reqs(ctx
))
1705 ret
= kmem_cache_alloc_bulk(req_cachep
, gfp
, IO_REQ_ALLOC_BATCH
,
1709 * Bulk alloc is all-or-nothing. If we fail to get a batch,
1710 * retry single alloc to be on the safe side.
1712 if (unlikely(ret
<= 0)) {
1713 state
->reqs
[0] = kmem_cache_alloc(req_cachep
, gfp
);
1714 if (!state
->reqs
[0])
1718 state
->free_reqs
= ret
;
1722 return state
->reqs
[state
->free_reqs
];
1725 static inline void io_put_file(struct file
*file
)
1731 static void io_dismantle_req(struct io_kiocb
*req
)
1733 unsigned int flags
= req
->flags
;
1735 if (io_req_needs_clean(req
))
1737 if (!(flags
& REQ_F_FIXED_FILE
))
1738 io_put_file(req
->file
);
1739 if (req
->fixed_rsrc_refs
)
1740 percpu_ref_put(req
->fixed_rsrc_refs
);
1741 if (req
->async_data
)
1742 kfree(req
->async_data
);
1743 if (req
->work
.creds
) {
1744 put_cred(req
->work
.creds
);
1745 req
->work
.creds
= NULL
;
1749 /* must to be called somewhat shortly after putting a request */
1750 static inline void io_put_task(struct task_struct
*task
, int nr
)
1752 struct io_uring_task
*tctx
= task
->io_uring
;
1754 percpu_counter_sub(&tctx
->inflight
, nr
);
1755 if (unlikely(atomic_read(&tctx
->in_idle
)))
1756 wake_up(&tctx
->wait
);
1757 put_task_struct_many(task
, nr
);
1760 static void __io_free_req(struct io_kiocb
*req
)
1762 struct io_ring_ctx
*ctx
= req
->ctx
;
1764 io_dismantle_req(req
);
1765 io_put_task(req
->task
, 1);
1767 kmem_cache_free(req_cachep
, req
);
1768 percpu_ref_put(&ctx
->refs
);
1771 static inline void io_remove_next_linked(struct io_kiocb
*req
)
1773 struct io_kiocb
*nxt
= req
->link
;
1775 req
->link
= nxt
->link
;
1779 static bool io_kill_linked_timeout(struct io_kiocb
*req
)
1780 __must_hold(&req
->ctx
->completion_lock
)
1782 struct io_kiocb
*link
= req
->link
;
1785 * Can happen if a linked timeout fired and link had been like
1786 * req -> link t-out -> link t-out [-> ...]
1788 if (link
&& (link
->flags
& REQ_F_LTIMEOUT_ACTIVE
)) {
1789 struct io_timeout_data
*io
= link
->async_data
;
1791 io_remove_next_linked(req
);
1792 link
->timeout
.head
= NULL
;
1793 if (hrtimer_try_to_cancel(&io
->timer
) != -1) {
1794 io_cqring_fill_event(link
->ctx
, link
->user_data
,
1796 io_put_req_deferred(link
, 1);
1803 static void io_fail_links(struct io_kiocb
*req
)
1804 __must_hold(&req
->ctx
->completion_lock
)
1806 struct io_kiocb
*nxt
, *link
= req
->link
;
1813 trace_io_uring_fail_link(req
, link
);
1814 io_cqring_fill_event(link
->ctx
, link
->user_data
, -ECANCELED
, 0);
1815 io_put_req_deferred(link
, 2);
1820 static bool io_disarm_next(struct io_kiocb
*req
)
1821 __must_hold(&req
->ctx
->completion_lock
)
1823 bool posted
= false;
1825 if (likely(req
->flags
& REQ_F_LINK_TIMEOUT
))
1826 posted
= io_kill_linked_timeout(req
);
1827 if (unlikely((req
->flags
& REQ_F_FAIL_LINK
) &&
1828 !(req
->flags
& REQ_F_HARDLINK
))) {
1829 posted
|= (req
->link
!= NULL
);
1835 static struct io_kiocb
*__io_req_find_next(struct io_kiocb
*req
)
1837 struct io_kiocb
*nxt
;
1840 * If LINK is set, we have dependent requests in this chain. If we
1841 * didn't fail this request, queue the first one up, moving any other
1842 * dependencies to the next request. In case of failure, fail the rest
1845 if (req
->flags
& (REQ_F_LINK_TIMEOUT
| REQ_F_FAIL_LINK
)) {
1846 struct io_ring_ctx
*ctx
= req
->ctx
;
1847 unsigned long flags
;
1850 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
1851 posted
= io_disarm_next(req
);
1853 io_commit_cqring(req
->ctx
);
1854 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
1856 io_cqring_ev_posted(ctx
);
1863 static inline struct io_kiocb
*io_req_find_next(struct io_kiocb
*req
)
1865 if (likely(!(req
->flags
& (REQ_F_LINK
|REQ_F_HARDLINK
))))
1867 return __io_req_find_next(req
);
1870 static void ctx_flush_and_put(struct io_ring_ctx
*ctx
)
1874 if (ctx
->submit_state
.comp
.nr
) {
1875 mutex_lock(&ctx
->uring_lock
);
1876 io_submit_flush_completions(&ctx
->submit_state
.comp
, ctx
);
1877 mutex_unlock(&ctx
->uring_lock
);
1879 percpu_ref_put(&ctx
->refs
);
1882 static bool __tctx_task_work(struct io_uring_task
*tctx
)
1884 struct io_ring_ctx
*ctx
= NULL
;
1885 struct io_wq_work_list list
;
1886 struct io_wq_work_node
*node
;
1888 if (wq_list_empty(&tctx
->task_list
))
1891 spin_lock_irq(&tctx
->task_lock
);
1892 list
= tctx
->task_list
;
1893 INIT_WQ_LIST(&tctx
->task_list
);
1894 spin_unlock_irq(&tctx
->task_lock
);
1898 struct io_wq_work_node
*next
= node
->next
;
1899 struct io_kiocb
*req
;
1901 req
= container_of(node
, struct io_kiocb
, io_task_work
.node
);
1902 if (req
->ctx
!= ctx
) {
1903 ctx_flush_and_put(ctx
);
1905 percpu_ref_get(&ctx
->refs
);
1908 req
->task_work
.func(&req
->task_work
);
1912 ctx_flush_and_put(ctx
);
1913 return list
.first
!= NULL
;
1916 static void tctx_task_work(struct callback_head
*cb
)
1918 struct io_uring_task
*tctx
= container_of(cb
, struct io_uring_task
, task_work
);
1920 clear_bit(0, &tctx
->task_state
);
1922 while (__tctx_task_work(tctx
))
1926 static int io_req_task_work_add(struct io_kiocb
*req
)
1928 struct task_struct
*tsk
= req
->task
;
1929 struct io_uring_task
*tctx
= tsk
->io_uring
;
1930 enum task_work_notify_mode notify
;
1931 struct io_wq_work_node
*node
, *prev
;
1932 unsigned long flags
;
1935 if (unlikely(tsk
->flags
& PF_EXITING
))
1938 WARN_ON_ONCE(!tctx
);
1940 spin_lock_irqsave(&tctx
->task_lock
, flags
);
1941 wq_list_add_tail(&req
->io_task_work
.node
, &tctx
->task_list
);
1942 spin_unlock_irqrestore(&tctx
->task_lock
, flags
);
1944 /* task_work already pending, we're done */
1945 if (test_bit(0, &tctx
->task_state
) ||
1946 test_and_set_bit(0, &tctx
->task_state
))
1950 * SQPOLL kernel thread doesn't need notification, just a wakeup. For
1951 * all other cases, use TWA_SIGNAL unconditionally to ensure we're
1952 * processing task_work. There's no reliable way to tell if TWA_RESUME
1955 notify
= (req
->ctx
->flags
& IORING_SETUP_SQPOLL
) ? TWA_NONE
: TWA_SIGNAL
;
1957 if (!task_work_add(tsk
, &tctx
->task_work
, notify
)) {
1958 wake_up_process(tsk
);
1963 * Slow path - we failed, find and delete work. if the work is not
1964 * in the list, it got run and we're fine.
1966 spin_lock_irqsave(&tctx
->task_lock
, flags
);
1967 wq_list_for_each(node
, prev
, &tctx
->task_list
) {
1968 if (&req
->io_task_work
.node
== node
) {
1969 wq_list_del(&tctx
->task_list
, node
, prev
);
1974 spin_unlock_irqrestore(&tctx
->task_lock
, flags
);
1975 clear_bit(0, &tctx
->task_state
);
1979 static bool io_run_task_work_head(struct callback_head
**work_head
)
1981 struct callback_head
*work
, *next
;
1982 bool executed
= false;
1985 work
= xchg(work_head
, NULL
);
2001 static void io_task_work_add_head(struct callback_head
**work_head
,
2002 struct callback_head
*task_work
)
2004 struct callback_head
*head
;
2007 head
= READ_ONCE(*work_head
);
2008 task_work
->next
= head
;
2009 } while (cmpxchg(work_head
, head
, task_work
) != head
);
2012 static void io_req_task_work_add_fallback(struct io_kiocb
*req
,
2013 task_work_func_t cb
)
2015 init_task_work(&req
->task_work
, cb
);
2016 io_task_work_add_head(&req
->ctx
->exit_task_work
, &req
->task_work
);
2019 static void io_req_task_cancel(struct callback_head
*cb
)
2021 struct io_kiocb
*req
= container_of(cb
, struct io_kiocb
, task_work
);
2022 struct io_ring_ctx
*ctx
= req
->ctx
;
2024 /* ctx is guaranteed to stay alive while we hold uring_lock */
2025 mutex_lock(&ctx
->uring_lock
);
2026 io_req_complete_failed(req
, req
->result
);
2027 mutex_unlock(&ctx
->uring_lock
);
2030 static void __io_req_task_submit(struct io_kiocb
*req
)
2032 struct io_ring_ctx
*ctx
= req
->ctx
;
2034 /* ctx stays valid until unlock, even if we drop all ours ctx->refs */
2035 mutex_lock(&ctx
->uring_lock
);
2036 if (!(current
->flags
& PF_EXITING
) && !current
->in_execve
)
2037 __io_queue_sqe(req
);
2039 io_req_complete_failed(req
, -EFAULT
);
2040 mutex_unlock(&ctx
->uring_lock
);
2043 static void io_req_task_submit(struct callback_head
*cb
)
2045 struct io_kiocb
*req
= container_of(cb
, struct io_kiocb
, task_work
);
2047 __io_req_task_submit(req
);
2050 static void io_req_task_queue_fail(struct io_kiocb
*req
, int ret
)
2053 req
->task_work
.func
= io_req_task_cancel
;
2055 if (unlikely(io_req_task_work_add(req
)))
2056 io_req_task_work_add_fallback(req
, io_req_task_cancel
);
2059 static void io_req_task_queue(struct io_kiocb
*req
)
2061 req
->task_work
.func
= io_req_task_submit
;
2063 if (unlikely(io_req_task_work_add(req
)))
2064 io_req_task_queue_fail(req
, -ECANCELED
);
2067 static inline void io_queue_next(struct io_kiocb
*req
)
2069 struct io_kiocb
*nxt
= io_req_find_next(req
);
2072 io_req_task_queue(nxt
);
2075 static void io_free_req(struct io_kiocb
*req
)
2082 struct task_struct
*task
;
2087 static inline void io_init_req_batch(struct req_batch
*rb
)
2094 static void io_req_free_batch_finish(struct io_ring_ctx
*ctx
,
2095 struct req_batch
*rb
)
2098 io_put_task(rb
->task
, rb
->task_refs
);
2100 percpu_ref_put_many(&ctx
->refs
, rb
->ctx_refs
);
2103 static void io_req_free_batch(struct req_batch
*rb
, struct io_kiocb
*req
,
2104 struct io_submit_state
*state
)
2107 io_dismantle_req(req
);
2109 if (req
->task
!= rb
->task
) {
2111 io_put_task(rb
->task
, rb
->task_refs
);
2112 rb
->task
= req
->task
;
2118 if (state
->free_reqs
!= ARRAY_SIZE(state
->reqs
))
2119 state
->reqs
[state
->free_reqs
++] = req
;
2121 list_add(&req
->compl.list
, &state
->comp
.free_list
);
2124 static void io_submit_flush_completions(struct io_comp_state
*cs
,
2125 struct io_ring_ctx
*ctx
)
2128 struct io_kiocb
*req
;
2129 struct req_batch rb
;
2131 io_init_req_batch(&rb
);
2132 spin_lock_irq(&ctx
->completion_lock
);
2133 for (i
= 0; i
< nr
; i
++) {
2135 __io_cqring_fill_event(ctx
, req
->user_data
, req
->result
,
2138 io_commit_cqring(ctx
);
2139 spin_unlock_irq(&ctx
->completion_lock
);
2141 io_cqring_ev_posted(ctx
);
2142 for (i
= 0; i
< nr
; i
++) {
2145 /* submission and completion refs */
2146 if (req_ref_sub_and_test(req
, 2))
2147 io_req_free_batch(&rb
, req
, &ctx
->submit_state
);
2150 io_req_free_batch_finish(ctx
, &rb
);
2155 * Drop reference to request, return next in chain (if there is one) if this
2156 * was the last reference to this request.
2158 static inline struct io_kiocb
*io_put_req_find_next(struct io_kiocb
*req
)
2160 struct io_kiocb
*nxt
= NULL
;
2162 if (req_ref_put_and_test(req
)) {
2163 nxt
= io_req_find_next(req
);
2169 static inline void io_put_req(struct io_kiocb
*req
)
2171 if (req_ref_put_and_test(req
))
2175 static void io_put_req_deferred_cb(struct callback_head
*cb
)
2177 struct io_kiocb
*req
= container_of(cb
, struct io_kiocb
, task_work
);
2182 static void io_free_req_deferred(struct io_kiocb
*req
)
2184 req
->task_work
.func
= io_put_req_deferred_cb
;
2185 if (unlikely(io_req_task_work_add(req
)))
2186 io_req_task_work_add_fallback(req
, io_put_req_deferred_cb
);
2189 static inline void io_put_req_deferred(struct io_kiocb
*req
, int refs
)
2191 if (req_ref_sub_and_test(req
, refs
))
2192 io_free_req_deferred(req
);
2195 static unsigned io_cqring_events(struct io_ring_ctx
*ctx
)
2197 /* See comment at the top of this file */
2199 return __io_cqring_events(ctx
);
2202 static inline unsigned int io_sqring_entries(struct io_ring_ctx
*ctx
)
2204 struct io_rings
*rings
= ctx
->rings
;
2206 /* make sure SQ entry isn't read before tail */
2207 return smp_load_acquire(&rings
->sq
.tail
) - ctx
->cached_sq_head
;
2210 static unsigned int io_put_kbuf(struct io_kiocb
*req
, struct io_buffer
*kbuf
)
2212 unsigned int cflags
;
2214 cflags
= kbuf
->bid
<< IORING_CQE_BUFFER_SHIFT
;
2215 cflags
|= IORING_CQE_F_BUFFER
;
2216 req
->flags
&= ~REQ_F_BUFFER_SELECTED
;
2221 static inline unsigned int io_put_rw_kbuf(struct io_kiocb
*req
)
2223 struct io_buffer
*kbuf
;
2225 kbuf
= (struct io_buffer
*) (unsigned long) req
->rw
.addr
;
2226 return io_put_kbuf(req
, kbuf
);
2229 static inline bool io_run_task_work(void)
2232 * Not safe to run on exiting task, and the task_work handling will
2233 * not add work to such a task.
2235 if (unlikely(current
->flags
& PF_EXITING
))
2237 if (current
->task_works
) {
2238 __set_current_state(TASK_RUNNING
);
2247 * Find and free completed poll iocbs
2249 static void io_iopoll_complete(struct io_ring_ctx
*ctx
, unsigned int *nr_events
,
2250 struct list_head
*done
)
2252 struct req_batch rb
;
2253 struct io_kiocb
*req
;
2255 /* order with ->result store in io_complete_rw_iopoll() */
2258 io_init_req_batch(&rb
);
2259 while (!list_empty(done
)) {
2262 req
= list_first_entry(done
, struct io_kiocb
, inflight_entry
);
2263 list_del(&req
->inflight_entry
);
2265 if (READ_ONCE(req
->result
) == -EAGAIN
&&
2266 !(req
->flags
& REQ_F_DONT_REISSUE
)) {
2267 req
->iopoll_completed
= 0;
2269 io_queue_async_work(req
);
2273 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
2274 cflags
= io_put_rw_kbuf(req
);
2276 __io_cqring_fill_event(ctx
, req
->user_data
, req
->result
, cflags
);
2279 if (req_ref_put_and_test(req
))
2280 io_req_free_batch(&rb
, req
, &ctx
->submit_state
);
2283 io_commit_cqring(ctx
);
2284 io_cqring_ev_posted_iopoll(ctx
);
2285 io_req_free_batch_finish(ctx
, &rb
);
2288 static int io_do_iopoll(struct io_ring_ctx
*ctx
, unsigned int *nr_events
,
2291 struct io_kiocb
*req
, *tmp
;
2297 * Only spin for completions if we don't have multiple devices hanging
2298 * off our complete list, and we're under the requested amount.
2300 spin
= !ctx
->poll_multi_file
&& *nr_events
< min
;
2303 list_for_each_entry_safe(req
, tmp
, &ctx
->iopoll_list
, inflight_entry
) {
2304 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
2307 * Move completed and retryable entries to our local lists.
2308 * If we find a request that requires polling, break out
2309 * and complete those lists first, if we have entries there.
2311 if (READ_ONCE(req
->iopoll_completed
)) {
2312 list_move_tail(&req
->inflight_entry
, &done
);
2315 if (!list_empty(&done
))
2318 ret
= kiocb
->ki_filp
->f_op
->iopoll(kiocb
, spin
);
2322 /* iopoll may have completed current req */
2323 if (READ_ONCE(req
->iopoll_completed
))
2324 list_move_tail(&req
->inflight_entry
, &done
);
2331 if (!list_empty(&done
))
2332 io_iopoll_complete(ctx
, nr_events
, &done
);
2338 * We can't just wait for polled events to come to us, we have to actively
2339 * find and complete them.
2341 static void io_iopoll_try_reap_events(struct io_ring_ctx
*ctx
)
2343 if (!(ctx
->flags
& IORING_SETUP_IOPOLL
))
2346 mutex_lock(&ctx
->uring_lock
);
2347 while (!list_empty(&ctx
->iopoll_list
)) {
2348 unsigned int nr_events
= 0;
2350 io_do_iopoll(ctx
, &nr_events
, 0);
2352 /* let it sleep and repeat later if can't complete a request */
2356 * Ensure we allow local-to-the-cpu processing to take place,
2357 * in this case we need to ensure that we reap all events.
2358 * Also let task_work, etc. to progress by releasing the mutex
2360 if (need_resched()) {
2361 mutex_unlock(&ctx
->uring_lock
);
2363 mutex_lock(&ctx
->uring_lock
);
2366 mutex_unlock(&ctx
->uring_lock
);
2369 static int io_iopoll_check(struct io_ring_ctx
*ctx
, long min
)
2371 unsigned int nr_events
= 0;
2375 * We disallow the app entering submit/complete with polling, but we
2376 * still need to lock the ring to prevent racing with polled issue
2377 * that got punted to a workqueue.
2379 mutex_lock(&ctx
->uring_lock
);
2381 * Don't enter poll loop if we already have events pending.
2382 * If we do, we can potentially be spinning for commands that
2383 * already triggered a CQE (eg in error).
2385 if (test_bit(0, &ctx
->cq_check_overflow
))
2386 __io_cqring_overflow_flush(ctx
, false);
2387 if (io_cqring_events(ctx
))
2391 * If a submit got punted to a workqueue, we can have the
2392 * application entering polling for a command before it gets
2393 * issued. That app will hold the uring_lock for the duration
2394 * of the poll right here, so we need to take a breather every
2395 * now and then to ensure that the issue has a chance to add
2396 * the poll to the issued list. Otherwise we can spin here
2397 * forever, while the workqueue is stuck trying to acquire the
2400 if (list_empty(&ctx
->iopoll_list
)) {
2401 mutex_unlock(&ctx
->uring_lock
);
2403 mutex_lock(&ctx
->uring_lock
);
2405 if (list_empty(&ctx
->iopoll_list
))
2408 ret
= io_do_iopoll(ctx
, &nr_events
, min
);
2409 } while (!ret
&& nr_events
< min
&& !need_resched());
2411 mutex_unlock(&ctx
->uring_lock
);
2415 static void kiocb_end_write(struct io_kiocb
*req
)
2418 * Tell lockdep we inherited freeze protection from submission
2421 if (req
->flags
& REQ_F_ISREG
) {
2422 struct super_block
*sb
= file_inode(req
->file
)->i_sb
;
2424 __sb_writers_acquired(sb
, SB_FREEZE_WRITE
);
2430 static bool io_resubmit_prep(struct io_kiocb
*req
)
2432 struct io_async_rw
*rw
= req
->async_data
;
2435 return !io_req_prep_async(req
);
2436 /* may have left rw->iter inconsistent on -EIOCBQUEUED */
2437 iov_iter_revert(&rw
->iter
, req
->result
- iov_iter_count(&rw
->iter
));
2441 static bool io_rw_should_reissue(struct io_kiocb
*req
)
2443 umode_t mode
= file_inode(req
->file
)->i_mode
;
2444 struct io_ring_ctx
*ctx
= req
->ctx
;
2446 if (!S_ISBLK(mode
) && !S_ISREG(mode
))
2448 if ((req
->flags
& REQ_F_NOWAIT
) || (io_wq_current_is_worker() &&
2449 !(ctx
->flags
& IORING_SETUP_IOPOLL
)))
2452 * If ref is dying, we might be running poll reap from the exit work.
2453 * Don't attempt to reissue from that path, just let it fail with
2456 if (percpu_ref_is_dying(&ctx
->refs
))
2461 static bool io_resubmit_prep(struct io_kiocb
*req
)
2465 static bool io_rw_should_reissue(struct io_kiocb
*req
)
2471 static void __io_complete_rw(struct io_kiocb
*req
, long res
, long res2
,
2472 unsigned int issue_flags
)
2476 if (req
->rw
.kiocb
.ki_flags
& IOCB_WRITE
)
2477 kiocb_end_write(req
);
2478 if (res
!= req
->result
) {
2479 if ((res
== -EAGAIN
|| res
== -EOPNOTSUPP
) &&
2480 io_rw_should_reissue(req
)) {
2481 req
->flags
|= REQ_F_REISSUE
;
2484 req_set_fail_links(req
);
2486 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
2487 cflags
= io_put_rw_kbuf(req
);
2488 __io_req_complete(req
, issue_flags
, res
, cflags
);
2491 static void io_complete_rw(struct kiocb
*kiocb
, long res
, long res2
)
2493 struct io_kiocb
*req
= container_of(kiocb
, struct io_kiocb
, rw
.kiocb
);
2495 __io_complete_rw(req
, res
, res2
, 0);
2498 static void io_complete_rw_iopoll(struct kiocb
*kiocb
, long res
, long res2
)
2500 struct io_kiocb
*req
= container_of(kiocb
, struct io_kiocb
, rw
.kiocb
);
2502 if (kiocb
->ki_flags
& IOCB_WRITE
)
2503 kiocb_end_write(req
);
2504 if (unlikely(res
!= req
->result
)) {
2505 if (!(res
== -EAGAIN
&& io_rw_should_reissue(req
) &&
2506 io_resubmit_prep(req
))) {
2507 req_set_fail_links(req
);
2508 req
->flags
|= REQ_F_DONT_REISSUE
;
2512 WRITE_ONCE(req
->result
, res
);
2513 /* order with io_iopoll_complete() checking ->result */
2515 WRITE_ONCE(req
->iopoll_completed
, 1);
2519 * After the iocb has been issued, it's safe to be found on the poll list.
2520 * Adding the kiocb to the list AFTER submission ensures that we don't
2521 * find it from a io_do_iopoll() thread before the issuer is done
2522 * accessing the kiocb cookie.
2524 static void io_iopoll_req_issued(struct io_kiocb
*req
, bool in_async
)
2526 struct io_ring_ctx
*ctx
= req
->ctx
;
2529 * Track whether we have multiple files in our lists. This will impact
2530 * how we do polling eventually, not spinning if we're on potentially
2531 * different devices.
2533 if (list_empty(&ctx
->iopoll_list
)) {
2534 ctx
->poll_multi_file
= false;
2535 } else if (!ctx
->poll_multi_file
) {
2536 struct io_kiocb
*list_req
;
2538 list_req
= list_first_entry(&ctx
->iopoll_list
, struct io_kiocb
,
2540 if (list_req
->file
!= req
->file
)
2541 ctx
->poll_multi_file
= true;
2545 * For fast devices, IO may have already completed. If it has, add
2546 * it to the front so we find it first.
2548 if (READ_ONCE(req
->iopoll_completed
))
2549 list_add(&req
->inflight_entry
, &ctx
->iopoll_list
);
2551 list_add_tail(&req
->inflight_entry
, &ctx
->iopoll_list
);
2554 * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread
2555 * task context or in io worker task context. If current task context is
2556 * sq thread, we don't need to check whether should wake up sq thread.
2558 if (in_async
&& (ctx
->flags
& IORING_SETUP_SQPOLL
) &&
2559 wq_has_sleeper(&ctx
->sq_data
->wait
))
2560 wake_up(&ctx
->sq_data
->wait
);
2563 static inline void io_state_file_put(struct io_submit_state
*state
)
2565 if (state
->file_refs
) {
2566 fput_many(state
->file
, state
->file_refs
);
2567 state
->file_refs
= 0;
2572 * Get as many references to a file as we have IOs left in this submission,
2573 * assuming most submissions are for one file, or at least that each file
2574 * has more than one submission.
2576 static struct file
*__io_file_get(struct io_submit_state
*state
, int fd
)
2581 if (state
->file_refs
) {
2582 if (state
->fd
== fd
) {
2586 io_state_file_put(state
);
2588 state
->file
= fget_many(fd
, state
->ios_left
);
2589 if (unlikely(!state
->file
))
2593 state
->file_refs
= state
->ios_left
- 1;
2597 static bool io_bdev_nowait(struct block_device
*bdev
)
2599 return !bdev
|| blk_queue_nowait(bdev_get_queue(bdev
));
2603 * If we tracked the file through the SCM inflight mechanism, we could support
2604 * any file. For now, just ensure that anything potentially problematic is done
2607 static bool __io_file_supports_async(struct file
*file
, int rw
)
2609 umode_t mode
= file_inode(file
)->i_mode
;
2611 if (S_ISBLK(mode
)) {
2612 if (IS_ENABLED(CONFIG_BLOCK
) &&
2613 io_bdev_nowait(I_BDEV(file
->f_mapping
->host
)))
2617 if (S_ISCHR(mode
) || S_ISSOCK(mode
))
2619 if (S_ISREG(mode
)) {
2620 if (IS_ENABLED(CONFIG_BLOCK
) &&
2621 io_bdev_nowait(file
->f_inode
->i_sb
->s_bdev
) &&
2622 file
->f_op
!= &io_uring_fops
)
2627 /* any ->read/write should understand O_NONBLOCK */
2628 if (file
->f_flags
& O_NONBLOCK
)
2631 if (!(file
->f_mode
& FMODE_NOWAIT
))
2635 return file
->f_op
->read_iter
!= NULL
;
2637 return file
->f_op
->write_iter
!= NULL
;
2640 static bool io_file_supports_async(struct io_kiocb
*req
, int rw
)
2642 if (rw
== READ
&& (req
->flags
& REQ_F_ASYNC_READ
))
2644 else if (rw
== WRITE
&& (req
->flags
& REQ_F_ASYNC_WRITE
))
2647 return __io_file_supports_async(req
->file
, rw
);
2650 static int io_prep_rw(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
2652 struct io_ring_ctx
*ctx
= req
->ctx
;
2653 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
2654 struct file
*file
= req
->file
;
2658 if (!(req
->flags
& REQ_F_ISREG
) && S_ISREG(file_inode(file
)->i_mode
))
2659 req
->flags
|= REQ_F_ISREG
;
2661 kiocb
->ki_pos
= READ_ONCE(sqe
->off
);
2662 if (kiocb
->ki_pos
== -1 && !(file
->f_mode
& FMODE_STREAM
)) {
2663 req
->flags
|= REQ_F_CUR_POS
;
2664 kiocb
->ki_pos
= file
->f_pos
;
2666 kiocb
->ki_hint
= ki_hint_validate(file_write_hint(kiocb
->ki_filp
));
2667 kiocb
->ki_flags
= iocb_flags(kiocb
->ki_filp
);
2668 ret
= kiocb_set_rw_flags(kiocb
, READ_ONCE(sqe
->rw_flags
));
2672 /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */
2673 if ((kiocb
->ki_flags
& IOCB_NOWAIT
) || (file
->f_flags
& O_NONBLOCK
))
2674 req
->flags
|= REQ_F_NOWAIT
;
2676 ioprio
= READ_ONCE(sqe
->ioprio
);
2678 ret
= ioprio_check_cap(ioprio
);
2682 kiocb
->ki_ioprio
= ioprio
;
2684 kiocb
->ki_ioprio
= get_current_ioprio();
2686 if (ctx
->flags
& IORING_SETUP_IOPOLL
) {
2687 if (!(kiocb
->ki_flags
& IOCB_DIRECT
) ||
2688 !kiocb
->ki_filp
->f_op
->iopoll
)
2691 kiocb
->ki_flags
|= IOCB_HIPRI
;
2692 kiocb
->ki_complete
= io_complete_rw_iopoll
;
2693 req
->iopoll_completed
= 0;
2695 if (kiocb
->ki_flags
& IOCB_HIPRI
)
2697 kiocb
->ki_complete
= io_complete_rw
;
2700 if (req
->opcode
== IORING_OP_READ_FIXED
||
2701 req
->opcode
== IORING_OP_WRITE_FIXED
) {
2703 io_req_set_rsrc_node(req
);
2706 req
->rw
.addr
= READ_ONCE(sqe
->addr
);
2707 req
->rw
.len
= READ_ONCE(sqe
->len
);
2708 req
->buf_index
= READ_ONCE(sqe
->buf_index
);
2712 static inline void io_rw_done(struct kiocb
*kiocb
, ssize_t ret
)
2718 case -ERESTARTNOINTR
:
2719 case -ERESTARTNOHAND
:
2720 case -ERESTART_RESTARTBLOCK
:
2722 * We can't just restart the syscall, since previously
2723 * submitted sqes may already be in progress. Just fail this
2729 kiocb
->ki_complete(kiocb
, ret
, 0);
2733 static void kiocb_done(struct kiocb
*kiocb
, ssize_t ret
,
2734 unsigned int issue_flags
)
2736 struct io_kiocb
*req
= container_of(kiocb
, struct io_kiocb
, rw
.kiocb
);
2737 struct io_async_rw
*io
= req
->async_data
;
2738 bool check_reissue
= kiocb
->ki_complete
== io_complete_rw
;
2740 /* add previously done IO, if any */
2741 if (io
&& io
->bytes_done
> 0) {
2743 ret
= io
->bytes_done
;
2745 ret
+= io
->bytes_done
;
2748 if (req
->flags
& REQ_F_CUR_POS
)
2749 req
->file
->f_pos
= kiocb
->ki_pos
;
2750 if (ret
>= 0 && kiocb
->ki_complete
== io_complete_rw
)
2751 __io_complete_rw(req
, ret
, 0, issue_flags
);
2753 io_rw_done(kiocb
, ret
);
2755 if (check_reissue
&& req
->flags
& REQ_F_REISSUE
) {
2756 req
->flags
&= ~REQ_F_REISSUE
;
2757 if (io_resubmit_prep(req
)) {
2759 io_queue_async_work(req
);
2763 req_set_fail_links(req
);
2764 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
2765 cflags
= io_put_rw_kbuf(req
);
2766 __io_req_complete(req
, issue_flags
, ret
, cflags
);
2771 static int __io_import_fixed(struct io_kiocb
*req
, int rw
, struct iov_iter
*iter
,
2772 struct io_mapped_ubuf
*imu
)
2774 size_t len
= req
->rw
.len
;
2775 u64 buf_end
, buf_addr
= req
->rw
.addr
;
2778 if (unlikely(check_add_overflow(buf_addr
, (u64
)len
, &buf_end
)))
2780 /* not inside the mapped region */
2781 if (unlikely(buf_addr
< imu
->ubuf
|| buf_end
> imu
->ubuf_end
))
2785 * May not be a start of buffer, set size appropriately
2786 * and advance us to the beginning.
2788 offset
= buf_addr
- imu
->ubuf
;
2789 iov_iter_bvec(iter
, rw
, imu
->bvec
, imu
->nr_bvecs
, offset
+ len
);
2793 * Don't use iov_iter_advance() here, as it's really slow for
2794 * using the latter parts of a big fixed buffer - it iterates
2795 * over each segment manually. We can cheat a bit here, because
2798 * 1) it's a BVEC iter, we set it up
2799 * 2) all bvecs are PAGE_SIZE in size, except potentially the
2800 * first and last bvec
2802 * So just find our index, and adjust the iterator afterwards.
2803 * If the offset is within the first bvec (or the whole first
2804 * bvec, just use iov_iter_advance(). This makes it easier
2805 * since we can just skip the first segment, which may not
2806 * be PAGE_SIZE aligned.
2808 const struct bio_vec
*bvec
= imu
->bvec
;
2810 if (offset
<= bvec
->bv_len
) {
2811 iov_iter_advance(iter
, offset
);
2813 unsigned long seg_skip
;
2815 /* skip first vec */
2816 offset
-= bvec
->bv_len
;
2817 seg_skip
= 1 + (offset
>> PAGE_SHIFT
);
2819 iter
->bvec
= bvec
+ seg_skip
;
2820 iter
->nr_segs
-= seg_skip
;
2821 iter
->count
-= bvec
->bv_len
+ offset
;
2822 iter
->iov_offset
= offset
& ~PAGE_MASK
;
2829 static int io_import_fixed(struct io_kiocb
*req
, int rw
, struct iov_iter
*iter
)
2831 struct io_ring_ctx
*ctx
= req
->ctx
;
2832 struct io_mapped_ubuf
*imu
= req
->imu
;
2833 u16 index
, buf_index
= req
->buf_index
;
2836 if (unlikely(buf_index
>= ctx
->nr_user_bufs
))
2838 index
= array_index_nospec(buf_index
, ctx
->nr_user_bufs
);
2839 imu
= READ_ONCE(ctx
->user_bufs
[index
]);
2842 return __io_import_fixed(req
, rw
, iter
, imu
);
2845 static void io_ring_submit_unlock(struct io_ring_ctx
*ctx
, bool needs_lock
)
2848 mutex_unlock(&ctx
->uring_lock
);
2851 static void io_ring_submit_lock(struct io_ring_ctx
*ctx
, bool needs_lock
)
2854 * "Normal" inline submissions always hold the uring_lock, since we
2855 * grab it from the system call. Same is true for the SQPOLL offload.
2856 * The only exception is when we've detached the request and issue it
2857 * from an async worker thread, grab the lock for that case.
2860 mutex_lock(&ctx
->uring_lock
);
2863 static struct io_buffer
*io_buffer_select(struct io_kiocb
*req
, size_t *len
,
2864 int bgid
, struct io_buffer
*kbuf
,
2867 struct io_buffer
*head
;
2869 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
2872 io_ring_submit_lock(req
->ctx
, needs_lock
);
2874 lockdep_assert_held(&req
->ctx
->uring_lock
);
2876 head
= xa_load(&req
->ctx
->io_buffers
, bgid
);
2878 if (!list_empty(&head
->list
)) {
2879 kbuf
= list_last_entry(&head
->list
, struct io_buffer
,
2881 list_del(&kbuf
->list
);
2884 xa_erase(&req
->ctx
->io_buffers
, bgid
);
2886 if (*len
> kbuf
->len
)
2889 kbuf
= ERR_PTR(-ENOBUFS
);
2892 io_ring_submit_unlock(req
->ctx
, needs_lock
);
2897 static void __user
*io_rw_buffer_select(struct io_kiocb
*req
, size_t *len
,
2900 struct io_buffer
*kbuf
;
2903 kbuf
= (struct io_buffer
*) (unsigned long) req
->rw
.addr
;
2904 bgid
= req
->buf_index
;
2905 kbuf
= io_buffer_select(req
, len
, bgid
, kbuf
, needs_lock
);
2908 req
->rw
.addr
= (u64
) (unsigned long) kbuf
;
2909 req
->flags
|= REQ_F_BUFFER_SELECTED
;
2910 return u64_to_user_ptr(kbuf
->addr
);
2913 #ifdef CONFIG_COMPAT
2914 static ssize_t
io_compat_import(struct io_kiocb
*req
, struct iovec
*iov
,
2917 struct compat_iovec __user
*uiov
;
2918 compat_ssize_t clen
;
2922 uiov
= u64_to_user_ptr(req
->rw
.addr
);
2923 if (!access_ok(uiov
, sizeof(*uiov
)))
2925 if (__get_user(clen
, &uiov
->iov_len
))
2931 buf
= io_rw_buffer_select(req
, &len
, needs_lock
);
2933 return PTR_ERR(buf
);
2934 iov
[0].iov_base
= buf
;
2935 iov
[0].iov_len
= (compat_size_t
) len
;
2940 static ssize_t
__io_iov_buffer_select(struct io_kiocb
*req
, struct iovec
*iov
,
2943 struct iovec __user
*uiov
= u64_to_user_ptr(req
->rw
.addr
);
2947 if (copy_from_user(iov
, uiov
, sizeof(*uiov
)))
2950 len
= iov
[0].iov_len
;
2953 buf
= io_rw_buffer_select(req
, &len
, needs_lock
);
2955 return PTR_ERR(buf
);
2956 iov
[0].iov_base
= buf
;
2957 iov
[0].iov_len
= len
;
2961 static ssize_t
io_iov_buffer_select(struct io_kiocb
*req
, struct iovec
*iov
,
2964 if (req
->flags
& REQ_F_BUFFER_SELECTED
) {
2965 struct io_buffer
*kbuf
;
2967 kbuf
= (struct io_buffer
*) (unsigned long) req
->rw
.addr
;
2968 iov
[0].iov_base
= u64_to_user_ptr(kbuf
->addr
);
2969 iov
[0].iov_len
= kbuf
->len
;
2972 if (req
->rw
.len
!= 1)
2975 #ifdef CONFIG_COMPAT
2976 if (req
->ctx
->compat
)
2977 return io_compat_import(req
, iov
, needs_lock
);
2980 return __io_iov_buffer_select(req
, iov
, needs_lock
);
2983 static int io_import_iovec(int rw
, struct io_kiocb
*req
, struct iovec
**iovec
,
2984 struct iov_iter
*iter
, bool needs_lock
)
2986 void __user
*buf
= u64_to_user_ptr(req
->rw
.addr
);
2987 size_t sqe_len
= req
->rw
.len
;
2988 u8 opcode
= req
->opcode
;
2991 if (opcode
== IORING_OP_READ_FIXED
|| opcode
== IORING_OP_WRITE_FIXED
) {
2993 return io_import_fixed(req
, rw
, iter
);
2996 /* buffer index only valid with fixed read/write, or buffer select */
2997 if (req
->buf_index
&& !(req
->flags
& REQ_F_BUFFER_SELECT
))
3000 if (opcode
== IORING_OP_READ
|| opcode
== IORING_OP_WRITE
) {
3001 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
3002 buf
= io_rw_buffer_select(req
, &sqe_len
, needs_lock
);
3004 return PTR_ERR(buf
);
3005 req
->rw
.len
= sqe_len
;
3008 ret
= import_single_range(rw
, buf
, sqe_len
, *iovec
, iter
);
3013 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
3014 ret
= io_iov_buffer_select(req
, *iovec
, needs_lock
);
3016 iov_iter_init(iter
, rw
, *iovec
, 1, (*iovec
)->iov_len
);
3021 return __import_iovec(rw
, buf
, sqe_len
, UIO_FASTIOV
, iovec
, iter
,
3025 static inline loff_t
*io_kiocb_ppos(struct kiocb
*kiocb
)
3027 return (kiocb
->ki_filp
->f_mode
& FMODE_STREAM
) ? NULL
: &kiocb
->ki_pos
;
3031 * For files that don't have ->read_iter() and ->write_iter(), handle them
3032 * by looping over ->read() or ->write() manually.
3034 static ssize_t
loop_rw_iter(int rw
, struct io_kiocb
*req
, struct iov_iter
*iter
)
3036 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
3037 struct file
*file
= req
->file
;
3041 * Don't support polled IO through this interface, and we can't
3042 * support non-blocking either. For the latter, this just causes
3043 * the kiocb to be handled from an async context.
3045 if (kiocb
->ki_flags
& IOCB_HIPRI
)
3047 if (kiocb
->ki_flags
& IOCB_NOWAIT
)
3050 while (iov_iter_count(iter
)) {
3054 if (!iov_iter_is_bvec(iter
)) {
3055 iovec
= iov_iter_iovec(iter
);
3057 iovec
.iov_base
= u64_to_user_ptr(req
->rw
.addr
);
3058 iovec
.iov_len
= req
->rw
.len
;
3062 nr
= file
->f_op
->read(file
, iovec
.iov_base
,
3063 iovec
.iov_len
, io_kiocb_ppos(kiocb
));
3065 nr
= file
->f_op
->write(file
, iovec
.iov_base
,
3066 iovec
.iov_len
, io_kiocb_ppos(kiocb
));
3075 if (nr
!= iovec
.iov_len
)
3079 iov_iter_advance(iter
, nr
);
3085 static void io_req_map_rw(struct io_kiocb
*req
, const struct iovec
*iovec
,
3086 const struct iovec
*fast_iov
, struct iov_iter
*iter
)
3088 struct io_async_rw
*rw
= req
->async_data
;
3090 memcpy(&rw
->iter
, iter
, sizeof(*iter
));
3091 rw
->free_iovec
= iovec
;
3093 /* can only be fixed buffers, no need to do anything */
3094 if (iov_iter_is_bvec(iter
))
3097 unsigned iov_off
= 0;
3099 rw
->iter
.iov
= rw
->fast_iov
;
3100 if (iter
->iov
!= fast_iov
) {
3101 iov_off
= iter
->iov
- fast_iov
;
3102 rw
->iter
.iov
+= iov_off
;
3104 if (rw
->fast_iov
!= fast_iov
)
3105 memcpy(rw
->fast_iov
+ iov_off
, fast_iov
+ iov_off
,
3106 sizeof(struct iovec
) * iter
->nr_segs
);
3108 req
->flags
|= REQ_F_NEED_CLEANUP
;
3112 static inline int io_alloc_async_data(struct io_kiocb
*req
)
3114 WARN_ON_ONCE(!io_op_defs
[req
->opcode
].async_size
);
3115 req
->async_data
= kmalloc(io_op_defs
[req
->opcode
].async_size
, GFP_KERNEL
);
3116 return req
->async_data
== NULL
;
3119 static int io_setup_async_rw(struct io_kiocb
*req
, const struct iovec
*iovec
,
3120 const struct iovec
*fast_iov
,
3121 struct iov_iter
*iter
, bool force
)
3123 if (!force
&& !io_op_defs
[req
->opcode
].needs_async_setup
)
3125 if (!req
->async_data
) {
3126 if (io_alloc_async_data(req
)) {
3131 io_req_map_rw(req
, iovec
, fast_iov
, iter
);
3136 static inline int io_rw_prep_async(struct io_kiocb
*req
, int rw
)
3138 struct io_async_rw
*iorw
= req
->async_data
;
3139 struct iovec
*iov
= iorw
->fast_iov
;
3142 ret
= io_import_iovec(rw
, req
, &iov
, &iorw
->iter
, false);
3143 if (unlikely(ret
< 0))
3146 iorw
->bytes_done
= 0;
3147 iorw
->free_iovec
= iov
;
3149 req
->flags
|= REQ_F_NEED_CLEANUP
;
3153 static int io_read_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3155 if (unlikely(!(req
->file
->f_mode
& FMODE_READ
)))
3157 return io_prep_rw(req
, sqe
);
3161 * This is our waitqueue callback handler, registered through lock_page_async()
3162 * when we initially tried to do the IO with the iocb armed our waitqueue.
3163 * This gets called when the page is unlocked, and we generally expect that to
3164 * happen when the page IO is completed and the page is now uptodate. This will
3165 * queue a task_work based retry of the operation, attempting to copy the data
3166 * again. If the latter fails because the page was NOT uptodate, then we will
3167 * do a thread based blocking retry of the operation. That's the unexpected
3170 static int io_async_buf_func(struct wait_queue_entry
*wait
, unsigned mode
,
3171 int sync
, void *arg
)
3173 struct wait_page_queue
*wpq
;
3174 struct io_kiocb
*req
= wait
->private;
3175 struct wait_page_key
*key
= arg
;
3177 wpq
= container_of(wait
, struct wait_page_queue
, wait
);
3179 if (!wake_page_match(wpq
, key
))
3182 req
->rw
.kiocb
.ki_flags
&= ~IOCB_WAITQ
;
3183 list_del_init(&wait
->entry
);
3185 /* submit ref gets dropped, acquire a new one */
3187 io_req_task_queue(req
);
3192 * This controls whether a given IO request should be armed for async page
3193 * based retry. If we return false here, the request is handed to the async
3194 * worker threads for retry. If we're doing buffered reads on a regular file,
3195 * we prepare a private wait_page_queue entry and retry the operation. This
3196 * will either succeed because the page is now uptodate and unlocked, or it
3197 * will register a callback when the page is unlocked at IO completion. Through
3198 * that callback, io_uring uses task_work to setup a retry of the operation.
3199 * That retry will attempt the buffered read again. The retry will generally
3200 * succeed, or in rare cases where it fails, we then fall back to using the
3201 * async worker threads for a blocking retry.
3203 static bool io_rw_should_retry(struct io_kiocb
*req
)
3205 struct io_async_rw
*rw
= req
->async_data
;
3206 struct wait_page_queue
*wait
= &rw
->wpq
;
3207 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
3209 /* never retry for NOWAIT, we just complete with -EAGAIN */
3210 if (req
->flags
& REQ_F_NOWAIT
)
3213 /* Only for buffered IO */
3214 if (kiocb
->ki_flags
& (IOCB_DIRECT
| IOCB_HIPRI
))
3218 * just use poll if we can, and don't attempt if the fs doesn't
3219 * support callback based unlocks
3221 if (file_can_poll(req
->file
) || !(req
->file
->f_mode
& FMODE_BUF_RASYNC
))
3224 wait
->wait
.func
= io_async_buf_func
;
3225 wait
->wait
.private = req
;
3226 wait
->wait
.flags
= 0;
3227 INIT_LIST_HEAD(&wait
->wait
.entry
);
3228 kiocb
->ki_flags
|= IOCB_WAITQ
;
3229 kiocb
->ki_flags
&= ~IOCB_NOWAIT
;
3230 kiocb
->ki_waitq
= wait
;
3234 static int io_iter_do_read(struct io_kiocb
*req
, struct iov_iter
*iter
)
3236 if (req
->file
->f_op
->read_iter
)
3237 return call_read_iter(req
->file
, &req
->rw
.kiocb
, iter
);
3238 else if (req
->file
->f_op
->read
)
3239 return loop_rw_iter(READ
, req
, iter
);
3244 static int io_read(struct io_kiocb
*req
, unsigned int issue_flags
)
3246 struct iovec inline_vecs
[UIO_FASTIOV
], *iovec
= inline_vecs
;
3247 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
3248 struct iov_iter __iter
, *iter
= &__iter
;
3249 struct io_async_rw
*rw
= req
->async_data
;
3250 ssize_t io_size
, ret
, ret2
;
3251 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
3257 ret
= io_import_iovec(READ
, req
, &iovec
, iter
, !force_nonblock
);
3261 io_size
= iov_iter_count(iter
);
3262 req
->result
= io_size
;
3264 /* Ensure we clear previously set non-block flag */
3265 if (!force_nonblock
)
3266 kiocb
->ki_flags
&= ~IOCB_NOWAIT
;
3268 kiocb
->ki_flags
|= IOCB_NOWAIT
;
3270 /* If the file doesn't support async, just async punt */
3271 if (force_nonblock
&& !io_file_supports_async(req
, READ
)) {
3272 ret
= io_setup_async_rw(req
, iovec
, inline_vecs
, iter
, true);
3273 return ret
?: -EAGAIN
;
3276 ret
= rw_verify_area(READ
, req
->file
, io_kiocb_ppos(kiocb
), io_size
);
3277 if (unlikely(ret
)) {
3282 ret
= io_iter_do_read(req
, iter
);
3284 if (ret
== -EAGAIN
|| (req
->flags
& REQ_F_REISSUE
)) {
3285 req
->flags
&= ~REQ_F_REISSUE
;
3286 /* IOPOLL retry should happen for io-wq threads */
3287 if (!force_nonblock
&& !(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3289 /* no retry on NONBLOCK nor RWF_NOWAIT */
3290 if (req
->flags
& REQ_F_NOWAIT
)
3292 /* some cases will consume bytes even on error returns */
3293 iov_iter_revert(iter
, io_size
- iov_iter_count(iter
));
3295 } else if (ret
== -EIOCBQUEUED
) {
3297 } else if (ret
<= 0 || ret
== io_size
|| !force_nonblock
||
3298 (req
->flags
& REQ_F_NOWAIT
) || !(req
->flags
& REQ_F_ISREG
)) {
3299 /* read all, failed, already did sync or don't want to retry */
3303 ret2
= io_setup_async_rw(req
, iovec
, inline_vecs
, iter
, true);
3308 rw
= req
->async_data
;
3309 /* now use our persistent iterator, if we aren't already */
3314 rw
->bytes_done
+= ret
;
3315 /* if we can retry, do so with the callbacks armed */
3316 if (!io_rw_should_retry(req
)) {
3317 kiocb
->ki_flags
&= ~IOCB_WAITQ
;
3322 * Now retry read with the IOCB_WAITQ parts set in the iocb. If
3323 * we get -EIOCBQUEUED, then we'll get a notification when the
3324 * desired page gets unlocked. We can also get a partial read
3325 * here, and if we do, then just retry at the new offset.
3327 ret
= io_iter_do_read(req
, iter
);
3328 if (ret
== -EIOCBQUEUED
)
3330 /* we got some bytes, but not all. retry. */
3331 kiocb
->ki_flags
&= ~IOCB_WAITQ
;
3332 } while (ret
> 0 && ret
< io_size
);
3334 kiocb_done(kiocb
, ret
, issue_flags
);
3336 /* it's faster to check here then delegate to kfree */
3342 static int io_write_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3344 if (unlikely(!(req
->file
->f_mode
& FMODE_WRITE
)))
3346 return io_prep_rw(req
, sqe
);
3349 static int io_write(struct io_kiocb
*req
, unsigned int issue_flags
)
3351 struct iovec inline_vecs
[UIO_FASTIOV
], *iovec
= inline_vecs
;
3352 struct kiocb
*kiocb
= &req
->rw
.kiocb
;
3353 struct iov_iter __iter
, *iter
= &__iter
;
3354 struct io_async_rw
*rw
= req
->async_data
;
3355 ssize_t ret
, ret2
, io_size
;
3356 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
3362 ret
= io_import_iovec(WRITE
, req
, &iovec
, iter
, !force_nonblock
);
3366 io_size
= iov_iter_count(iter
);
3367 req
->result
= io_size
;
3369 /* Ensure we clear previously set non-block flag */
3370 if (!force_nonblock
)
3371 kiocb
->ki_flags
&= ~IOCB_NOWAIT
;
3373 kiocb
->ki_flags
|= IOCB_NOWAIT
;
3375 /* If the file doesn't support async, just async punt */
3376 if (force_nonblock
&& !io_file_supports_async(req
, WRITE
))
3379 /* file path doesn't support NOWAIT for non-direct_IO */
3380 if (force_nonblock
&& !(kiocb
->ki_flags
& IOCB_DIRECT
) &&
3381 (req
->flags
& REQ_F_ISREG
))
3384 ret
= rw_verify_area(WRITE
, req
->file
, io_kiocb_ppos(kiocb
), io_size
);
3389 * Open-code file_start_write here to grab freeze protection,
3390 * which will be released by another thread in
3391 * io_complete_rw(). Fool lockdep by telling it the lock got
3392 * released so that it doesn't complain about the held lock when
3393 * we return to userspace.
3395 if (req
->flags
& REQ_F_ISREG
) {
3396 sb_start_write(file_inode(req
->file
)->i_sb
);
3397 __sb_writers_release(file_inode(req
->file
)->i_sb
,
3400 kiocb
->ki_flags
|= IOCB_WRITE
;
3402 if (req
->file
->f_op
->write_iter
)
3403 ret2
= call_write_iter(req
->file
, kiocb
, iter
);
3404 else if (req
->file
->f_op
->write
)
3405 ret2
= loop_rw_iter(WRITE
, req
, iter
);
3409 if (req
->flags
& REQ_F_REISSUE
) {
3410 req
->flags
&= ~REQ_F_REISSUE
;
3415 * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just
3416 * retry them without IOCB_NOWAIT.
3418 if (ret2
== -EOPNOTSUPP
&& (kiocb
->ki_flags
& IOCB_NOWAIT
))
3420 /* no retry on NONBLOCK nor RWF_NOWAIT */
3421 if (ret2
== -EAGAIN
&& (req
->flags
& REQ_F_NOWAIT
))
3423 if (!force_nonblock
|| ret2
!= -EAGAIN
) {
3424 /* IOPOLL retry should happen for io-wq threads */
3425 if ((req
->ctx
->flags
& IORING_SETUP_IOPOLL
) && ret2
== -EAGAIN
)
3428 kiocb_done(kiocb
, ret2
, issue_flags
);
3431 /* some cases will consume bytes even on error returns */
3432 iov_iter_revert(iter
, io_size
- iov_iter_count(iter
));
3433 ret
= io_setup_async_rw(req
, iovec
, inline_vecs
, iter
, false);
3434 return ret
?: -EAGAIN
;
3437 /* it's reportedly faster than delegating the null check to kfree() */
3443 static int io_renameat_prep(struct io_kiocb
*req
,
3444 const struct io_uring_sqe
*sqe
)
3446 struct io_rename
*ren
= &req
->rename
;
3447 const char __user
*oldf
, *newf
;
3449 if (unlikely(req
->flags
& REQ_F_FIXED_FILE
))
3452 ren
->old_dfd
= READ_ONCE(sqe
->fd
);
3453 oldf
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
3454 newf
= u64_to_user_ptr(READ_ONCE(sqe
->addr2
));
3455 ren
->new_dfd
= READ_ONCE(sqe
->len
);
3456 ren
->flags
= READ_ONCE(sqe
->rename_flags
);
3458 ren
->oldpath
= getname(oldf
);
3459 if (IS_ERR(ren
->oldpath
))
3460 return PTR_ERR(ren
->oldpath
);
3462 ren
->newpath
= getname(newf
);
3463 if (IS_ERR(ren
->newpath
)) {
3464 putname(ren
->oldpath
);
3465 return PTR_ERR(ren
->newpath
);
3468 req
->flags
|= REQ_F_NEED_CLEANUP
;
3472 static int io_renameat(struct io_kiocb
*req
, unsigned int issue_flags
)
3474 struct io_rename
*ren
= &req
->rename
;
3477 if (issue_flags
& IO_URING_F_NONBLOCK
)
3480 ret
= do_renameat2(ren
->old_dfd
, ren
->oldpath
, ren
->new_dfd
,
3481 ren
->newpath
, ren
->flags
);
3483 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
3485 req_set_fail_links(req
);
3486 io_req_complete(req
, ret
);
3490 static int io_unlinkat_prep(struct io_kiocb
*req
,
3491 const struct io_uring_sqe
*sqe
)
3493 struct io_unlink
*un
= &req
->unlink
;
3494 const char __user
*fname
;
3496 if (unlikely(req
->flags
& REQ_F_FIXED_FILE
))
3499 un
->dfd
= READ_ONCE(sqe
->fd
);
3501 un
->flags
= READ_ONCE(sqe
->unlink_flags
);
3502 if (un
->flags
& ~AT_REMOVEDIR
)
3505 fname
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
3506 un
->filename
= getname(fname
);
3507 if (IS_ERR(un
->filename
))
3508 return PTR_ERR(un
->filename
);
3510 req
->flags
|= REQ_F_NEED_CLEANUP
;
3514 static int io_unlinkat(struct io_kiocb
*req
, unsigned int issue_flags
)
3516 struct io_unlink
*un
= &req
->unlink
;
3519 if (issue_flags
& IO_URING_F_NONBLOCK
)
3522 if (un
->flags
& AT_REMOVEDIR
)
3523 ret
= do_rmdir(un
->dfd
, un
->filename
);
3525 ret
= do_unlinkat(un
->dfd
, un
->filename
);
3527 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
3529 req_set_fail_links(req
);
3530 io_req_complete(req
, ret
);
3534 static int io_shutdown_prep(struct io_kiocb
*req
,
3535 const struct io_uring_sqe
*sqe
)
3537 #if defined(CONFIG_NET)
3538 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3540 if (sqe
->ioprio
|| sqe
->off
|| sqe
->addr
|| sqe
->rw_flags
||
3544 req
->shutdown
.how
= READ_ONCE(sqe
->len
);
3551 static int io_shutdown(struct io_kiocb
*req
, unsigned int issue_flags
)
3553 #if defined(CONFIG_NET)
3554 struct socket
*sock
;
3557 if (issue_flags
& IO_URING_F_NONBLOCK
)
3560 sock
= sock_from_file(req
->file
);
3561 if (unlikely(!sock
))
3564 ret
= __sys_shutdown_sock(sock
, req
->shutdown
.how
);
3566 req_set_fail_links(req
);
3567 io_req_complete(req
, ret
);
3574 static int __io_splice_prep(struct io_kiocb
*req
,
3575 const struct io_uring_sqe
*sqe
)
3577 struct io_splice
* sp
= &req
->splice
;
3578 unsigned int valid_flags
= SPLICE_F_FD_IN_FIXED
| SPLICE_F_ALL
;
3580 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3584 sp
->len
= READ_ONCE(sqe
->len
);
3585 sp
->flags
= READ_ONCE(sqe
->splice_flags
);
3587 if (unlikely(sp
->flags
& ~valid_flags
))
3590 sp
->file_in
= io_file_get(NULL
, req
, READ_ONCE(sqe
->splice_fd_in
),
3591 (sp
->flags
& SPLICE_F_FD_IN_FIXED
));
3594 req
->flags
|= REQ_F_NEED_CLEANUP
;
3598 static int io_tee_prep(struct io_kiocb
*req
,
3599 const struct io_uring_sqe
*sqe
)
3601 if (READ_ONCE(sqe
->splice_off_in
) || READ_ONCE(sqe
->off
))
3603 return __io_splice_prep(req
, sqe
);
3606 static int io_tee(struct io_kiocb
*req
, unsigned int issue_flags
)
3608 struct io_splice
*sp
= &req
->splice
;
3609 struct file
*in
= sp
->file_in
;
3610 struct file
*out
= sp
->file_out
;
3611 unsigned int flags
= sp
->flags
& ~SPLICE_F_FD_IN_FIXED
;
3614 if (issue_flags
& IO_URING_F_NONBLOCK
)
3617 ret
= do_tee(in
, out
, sp
->len
, flags
);
3619 if (!(sp
->flags
& SPLICE_F_FD_IN_FIXED
))
3621 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
3624 req_set_fail_links(req
);
3625 io_req_complete(req
, ret
);
3629 static int io_splice_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3631 struct io_splice
* sp
= &req
->splice
;
3633 sp
->off_in
= READ_ONCE(sqe
->splice_off_in
);
3634 sp
->off_out
= READ_ONCE(sqe
->off
);
3635 return __io_splice_prep(req
, sqe
);
3638 static int io_splice(struct io_kiocb
*req
, unsigned int issue_flags
)
3640 struct io_splice
*sp
= &req
->splice
;
3641 struct file
*in
= sp
->file_in
;
3642 struct file
*out
= sp
->file_out
;
3643 unsigned int flags
= sp
->flags
& ~SPLICE_F_FD_IN_FIXED
;
3644 loff_t
*poff_in
, *poff_out
;
3647 if (issue_flags
& IO_URING_F_NONBLOCK
)
3650 poff_in
= (sp
->off_in
== -1) ? NULL
: &sp
->off_in
;
3651 poff_out
= (sp
->off_out
== -1) ? NULL
: &sp
->off_out
;
3654 ret
= do_splice(in
, poff_in
, out
, poff_out
, sp
->len
, flags
);
3656 if (!(sp
->flags
& SPLICE_F_FD_IN_FIXED
))
3658 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
3661 req_set_fail_links(req
);
3662 io_req_complete(req
, ret
);
3667 * IORING_OP_NOP just posts a completion event, nothing else.
3669 static int io_nop(struct io_kiocb
*req
, unsigned int issue_flags
)
3671 struct io_ring_ctx
*ctx
= req
->ctx
;
3673 if (unlikely(ctx
->flags
& IORING_SETUP_IOPOLL
))
3676 __io_req_complete(req
, issue_flags
, 0, 0);
3680 static int io_fsync_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3682 struct io_ring_ctx
*ctx
= req
->ctx
;
3687 if (unlikely(ctx
->flags
& IORING_SETUP_IOPOLL
))
3689 if (unlikely(sqe
->addr
|| sqe
->ioprio
|| sqe
->buf_index
))
3692 req
->sync
.flags
= READ_ONCE(sqe
->fsync_flags
);
3693 if (unlikely(req
->sync
.flags
& ~IORING_FSYNC_DATASYNC
))
3696 req
->sync
.off
= READ_ONCE(sqe
->off
);
3697 req
->sync
.len
= READ_ONCE(sqe
->len
);
3701 static int io_fsync(struct io_kiocb
*req
, unsigned int issue_flags
)
3703 loff_t end
= req
->sync
.off
+ req
->sync
.len
;
3706 /* fsync always requires a blocking context */
3707 if (issue_flags
& IO_URING_F_NONBLOCK
)
3710 ret
= vfs_fsync_range(req
->file
, req
->sync
.off
,
3711 end
> 0 ? end
: LLONG_MAX
,
3712 req
->sync
.flags
& IORING_FSYNC_DATASYNC
);
3714 req_set_fail_links(req
);
3715 io_req_complete(req
, ret
);
3719 static int io_fallocate_prep(struct io_kiocb
*req
,
3720 const struct io_uring_sqe
*sqe
)
3722 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->rw_flags
)
3724 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3727 req
->sync
.off
= READ_ONCE(sqe
->off
);
3728 req
->sync
.len
= READ_ONCE(sqe
->addr
);
3729 req
->sync
.mode
= READ_ONCE(sqe
->len
);
3733 static int io_fallocate(struct io_kiocb
*req
, unsigned int issue_flags
)
3737 /* fallocate always requiring blocking context */
3738 if (issue_flags
& IO_URING_F_NONBLOCK
)
3740 ret
= vfs_fallocate(req
->file
, req
->sync
.mode
, req
->sync
.off
,
3743 req_set_fail_links(req
);
3744 io_req_complete(req
, ret
);
3748 static int __io_openat_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3750 const char __user
*fname
;
3753 if (unlikely(sqe
->ioprio
|| sqe
->buf_index
))
3755 if (unlikely(req
->flags
& REQ_F_FIXED_FILE
))
3758 /* open.how should be already initialised */
3759 if (!(req
->open
.how
.flags
& O_PATH
) && force_o_largefile())
3760 req
->open
.how
.flags
|= O_LARGEFILE
;
3762 req
->open
.dfd
= READ_ONCE(sqe
->fd
);
3763 fname
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
3764 req
->open
.filename
= getname(fname
);
3765 if (IS_ERR(req
->open
.filename
)) {
3766 ret
= PTR_ERR(req
->open
.filename
);
3767 req
->open
.filename
= NULL
;
3770 req
->open
.nofile
= rlimit(RLIMIT_NOFILE
);
3771 req
->flags
|= REQ_F_NEED_CLEANUP
;
3775 static int io_openat_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3779 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3781 mode
= READ_ONCE(sqe
->len
);
3782 flags
= READ_ONCE(sqe
->open_flags
);
3783 req
->open
.how
= build_open_how(flags
, mode
);
3784 return __io_openat_prep(req
, sqe
);
3787 static int io_openat2_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
3789 struct open_how __user
*how
;
3793 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
3795 how
= u64_to_user_ptr(READ_ONCE(sqe
->addr2
));
3796 len
= READ_ONCE(sqe
->len
);
3797 if (len
< OPEN_HOW_SIZE_VER0
)
3800 ret
= copy_struct_from_user(&req
->open
.how
, sizeof(req
->open
.how
), how
,
3805 return __io_openat_prep(req
, sqe
);
3808 static int io_openat2(struct io_kiocb
*req
, unsigned int issue_flags
)
3810 struct open_flags op
;
3813 bool resolve_nonblock
;
3816 ret
= build_open_flags(&req
->open
.how
, &op
);
3819 nonblock_set
= op
.open_flag
& O_NONBLOCK
;
3820 resolve_nonblock
= req
->open
.how
.resolve
& RESOLVE_CACHED
;
3821 if (issue_flags
& IO_URING_F_NONBLOCK
) {
3823 * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open,
3824 * it'll always -EAGAIN
3826 if (req
->open
.how
.flags
& (O_TRUNC
| O_CREAT
| O_TMPFILE
))
3828 op
.lookup_flags
|= LOOKUP_CACHED
;
3829 op
.open_flag
|= O_NONBLOCK
;
3832 ret
= __get_unused_fd_flags(req
->open
.how
.flags
, req
->open
.nofile
);
3836 file
= do_filp_open(req
->open
.dfd
, req
->open
.filename
, &op
);
3837 /* only retry if RESOLVE_CACHED wasn't already set by application */
3838 if ((!resolve_nonblock
&& (issue_flags
& IO_URING_F_NONBLOCK
)) &&
3839 file
== ERR_PTR(-EAGAIN
)) {
3841 * We could hang on to this 'fd', but seems like marginal
3842 * gain for something that is now known to be a slower path.
3843 * So just put it, and we'll get a new one when we retry.
3851 ret
= PTR_ERR(file
);
3853 if ((issue_flags
& IO_URING_F_NONBLOCK
) && !nonblock_set
)
3854 file
->f_flags
&= ~O_NONBLOCK
;
3855 fsnotify_open(file
);
3856 fd_install(ret
, file
);
3859 putname(req
->open
.filename
);
3860 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
3862 req_set_fail_links(req
);
3863 __io_req_complete(req
, issue_flags
, ret
, 0);
3867 static int io_openat(struct io_kiocb
*req
, unsigned int issue_flags
)
3869 return io_openat2(req
, issue_flags
);
3872 static int io_remove_buffers_prep(struct io_kiocb
*req
,
3873 const struct io_uring_sqe
*sqe
)
3875 struct io_provide_buf
*p
= &req
->pbuf
;
3878 if (sqe
->ioprio
|| sqe
->rw_flags
|| sqe
->addr
|| sqe
->len
|| sqe
->off
)
3881 tmp
= READ_ONCE(sqe
->fd
);
3882 if (!tmp
|| tmp
> USHRT_MAX
)
3885 memset(p
, 0, sizeof(*p
));
3887 p
->bgid
= READ_ONCE(sqe
->buf_group
);
3891 static int __io_remove_buffers(struct io_ring_ctx
*ctx
, struct io_buffer
*buf
,
3892 int bgid
, unsigned nbufs
)
3896 /* shouldn't happen */
3900 /* the head kbuf is the list itself */
3901 while (!list_empty(&buf
->list
)) {
3902 struct io_buffer
*nxt
;
3904 nxt
= list_first_entry(&buf
->list
, struct io_buffer
, list
);
3905 list_del(&nxt
->list
);
3912 xa_erase(&ctx
->io_buffers
, bgid
);
3917 static int io_remove_buffers(struct io_kiocb
*req
, unsigned int issue_flags
)
3919 struct io_provide_buf
*p
= &req
->pbuf
;
3920 struct io_ring_ctx
*ctx
= req
->ctx
;
3921 struct io_buffer
*head
;
3923 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
3925 io_ring_submit_lock(ctx
, !force_nonblock
);
3927 lockdep_assert_held(&ctx
->uring_lock
);
3930 head
= xa_load(&ctx
->io_buffers
, p
->bgid
);
3932 ret
= __io_remove_buffers(ctx
, head
, p
->bgid
, p
->nbufs
);
3934 req_set_fail_links(req
);
3936 /* complete before unlock, IOPOLL may need the lock */
3937 __io_req_complete(req
, issue_flags
, ret
, 0);
3938 io_ring_submit_unlock(ctx
, !force_nonblock
);
3942 static int io_provide_buffers_prep(struct io_kiocb
*req
,
3943 const struct io_uring_sqe
*sqe
)
3945 unsigned long size
, tmp_check
;
3946 struct io_provide_buf
*p
= &req
->pbuf
;
3949 if (sqe
->ioprio
|| sqe
->rw_flags
)
3952 tmp
= READ_ONCE(sqe
->fd
);
3953 if (!tmp
|| tmp
> USHRT_MAX
)
3956 p
->addr
= READ_ONCE(sqe
->addr
);
3957 p
->len
= READ_ONCE(sqe
->len
);
3959 if (check_mul_overflow((unsigned long)p
->len
, (unsigned long)p
->nbufs
,
3962 if (check_add_overflow((unsigned long)p
->addr
, size
, &tmp_check
))
3965 size
= (unsigned long)p
->len
* p
->nbufs
;
3966 if (!access_ok(u64_to_user_ptr(p
->addr
), size
))
3969 p
->bgid
= READ_ONCE(sqe
->buf_group
);
3970 tmp
= READ_ONCE(sqe
->off
);
3971 if (tmp
> USHRT_MAX
)
3977 static int io_add_buffers(struct io_provide_buf
*pbuf
, struct io_buffer
**head
)
3979 struct io_buffer
*buf
;
3980 u64 addr
= pbuf
->addr
;
3981 int i
, bid
= pbuf
->bid
;
3983 for (i
= 0; i
< pbuf
->nbufs
; i
++) {
3984 buf
= kmalloc(sizeof(*buf
), GFP_KERNEL
);
3989 buf
->len
= min_t(__u32
, pbuf
->len
, MAX_RW_COUNT
);
3994 INIT_LIST_HEAD(&buf
->list
);
3997 list_add_tail(&buf
->list
, &(*head
)->list
);
4001 return i
? i
: -ENOMEM
;
4004 static int io_provide_buffers(struct io_kiocb
*req
, unsigned int issue_flags
)
4006 struct io_provide_buf
*p
= &req
->pbuf
;
4007 struct io_ring_ctx
*ctx
= req
->ctx
;
4008 struct io_buffer
*head
, *list
;
4010 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4012 io_ring_submit_lock(ctx
, !force_nonblock
);
4014 lockdep_assert_held(&ctx
->uring_lock
);
4016 list
= head
= xa_load(&ctx
->io_buffers
, p
->bgid
);
4018 ret
= io_add_buffers(p
, &head
);
4019 if (ret
>= 0 && !list
) {
4020 ret
= xa_insert(&ctx
->io_buffers
, p
->bgid
, head
, GFP_KERNEL
);
4022 __io_remove_buffers(ctx
, head
, p
->bgid
, -1U);
4025 req_set_fail_links(req
);
4026 /* complete before unlock, IOPOLL may need the lock */
4027 __io_req_complete(req
, issue_flags
, ret
, 0);
4028 io_ring_submit_unlock(ctx
, !force_nonblock
);
4032 static int io_epoll_ctl_prep(struct io_kiocb
*req
,
4033 const struct io_uring_sqe
*sqe
)
4035 #if defined(CONFIG_EPOLL)
4036 if (sqe
->ioprio
|| sqe
->buf_index
)
4038 if (unlikely(req
->ctx
->flags
& (IORING_SETUP_IOPOLL
| IORING_SETUP_SQPOLL
)))
4041 req
->epoll
.epfd
= READ_ONCE(sqe
->fd
);
4042 req
->epoll
.op
= READ_ONCE(sqe
->len
);
4043 req
->epoll
.fd
= READ_ONCE(sqe
->off
);
4045 if (ep_op_has_event(req
->epoll
.op
)) {
4046 struct epoll_event __user
*ev
;
4048 ev
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4049 if (copy_from_user(&req
->epoll
.event
, ev
, sizeof(*ev
)))
4059 static int io_epoll_ctl(struct io_kiocb
*req
, unsigned int issue_flags
)
4061 #if defined(CONFIG_EPOLL)
4062 struct io_epoll
*ie
= &req
->epoll
;
4064 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4066 ret
= do_epoll_ctl(ie
->epfd
, ie
->op
, ie
->fd
, &ie
->event
, force_nonblock
);
4067 if (force_nonblock
&& ret
== -EAGAIN
)
4071 req_set_fail_links(req
);
4072 __io_req_complete(req
, issue_flags
, ret
, 0);
4079 static int io_madvise_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4081 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
4082 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->off
)
4084 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4087 req
->madvise
.addr
= READ_ONCE(sqe
->addr
);
4088 req
->madvise
.len
= READ_ONCE(sqe
->len
);
4089 req
->madvise
.advice
= READ_ONCE(sqe
->fadvise_advice
);
4096 static int io_madvise(struct io_kiocb
*req
, unsigned int issue_flags
)
4098 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
4099 struct io_madvise
*ma
= &req
->madvise
;
4102 if (issue_flags
& IO_URING_F_NONBLOCK
)
4105 ret
= do_madvise(current
->mm
, ma
->addr
, ma
->len
, ma
->advice
);
4107 req_set_fail_links(req
);
4108 io_req_complete(req
, ret
);
4115 static int io_fadvise_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4117 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->addr
)
4119 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4122 req
->fadvise
.offset
= READ_ONCE(sqe
->off
);
4123 req
->fadvise
.len
= READ_ONCE(sqe
->len
);
4124 req
->fadvise
.advice
= READ_ONCE(sqe
->fadvise_advice
);
4128 static int io_fadvise(struct io_kiocb
*req
, unsigned int issue_flags
)
4130 struct io_fadvise
*fa
= &req
->fadvise
;
4133 if (issue_flags
& IO_URING_F_NONBLOCK
) {
4134 switch (fa
->advice
) {
4135 case POSIX_FADV_NORMAL
:
4136 case POSIX_FADV_RANDOM
:
4137 case POSIX_FADV_SEQUENTIAL
:
4144 ret
= vfs_fadvise(req
->file
, fa
->offset
, fa
->len
, fa
->advice
);
4146 req_set_fail_links(req
);
4147 __io_req_complete(req
, issue_flags
, ret
, 0);
4151 static int io_statx_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4153 if (unlikely(req
->ctx
->flags
& (IORING_SETUP_IOPOLL
| IORING_SETUP_SQPOLL
)))
4155 if (sqe
->ioprio
|| sqe
->buf_index
)
4157 if (req
->flags
& REQ_F_FIXED_FILE
)
4160 req
->statx
.dfd
= READ_ONCE(sqe
->fd
);
4161 req
->statx
.mask
= READ_ONCE(sqe
->len
);
4162 req
->statx
.filename
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4163 req
->statx
.buffer
= u64_to_user_ptr(READ_ONCE(sqe
->addr2
));
4164 req
->statx
.flags
= READ_ONCE(sqe
->statx_flags
);
4169 static int io_statx(struct io_kiocb
*req
, unsigned int issue_flags
)
4171 struct io_statx
*ctx
= &req
->statx
;
4174 if (issue_flags
& IO_URING_F_NONBLOCK
)
4177 ret
= do_statx(ctx
->dfd
, ctx
->filename
, ctx
->flags
, ctx
->mask
,
4181 req_set_fail_links(req
);
4182 io_req_complete(req
, ret
);
4186 static int io_close_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4188 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4190 if (sqe
->ioprio
|| sqe
->off
|| sqe
->addr
|| sqe
->len
||
4191 sqe
->rw_flags
|| sqe
->buf_index
)
4193 if (req
->flags
& REQ_F_FIXED_FILE
)
4196 req
->close
.fd
= READ_ONCE(sqe
->fd
);
4200 static int io_close(struct io_kiocb
*req
, unsigned int issue_flags
)
4202 struct files_struct
*files
= current
->files
;
4203 struct io_close
*close
= &req
->close
;
4204 struct fdtable
*fdt
;
4205 struct file
*file
= NULL
;
4208 spin_lock(&files
->file_lock
);
4209 fdt
= files_fdtable(files
);
4210 if (close
->fd
>= fdt
->max_fds
) {
4211 spin_unlock(&files
->file_lock
);
4214 file
= fdt
->fd
[close
->fd
];
4215 if (!file
|| file
->f_op
== &io_uring_fops
) {
4216 spin_unlock(&files
->file_lock
);
4221 /* if the file has a flush method, be safe and punt to async */
4222 if (file
->f_op
->flush
&& (issue_flags
& IO_URING_F_NONBLOCK
)) {
4223 spin_unlock(&files
->file_lock
);
4227 ret
= __close_fd_get_file(close
->fd
, &file
);
4228 spin_unlock(&files
->file_lock
);
4235 /* No ->flush() or already async, safely close from here */
4236 ret
= filp_close(file
, current
->files
);
4239 req_set_fail_links(req
);
4242 __io_req_complete(req
, issue_flags
, ret
, 0);
4246 static int io_sfr_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4248 struct io_ring_ctx
*ctx
= req
->ctx
;
4250 if (unlikely(ctx
->flags
& IORING_SETUP_IOPOLL
))
4252 if (unlikely(sqe
->addr
|| sqe
->ioprio
|| sqe
->buf_index
))
4255 req
->sync
.off
= READ_ONCE(sqe
->off
);
4256 req
->sync
.len
= READ_ONCE(sqe
->len
);
4257 req
->sync
.flags
= READ_ONCE(sqe
->sync_range_flags
);
4261 static int io_sync_file_range(struct io_kiocb
*req
, unsigned int issue_flags
)
4265 /* sync_file_range always requires a blocking context */
4266 if (issue_flags
& IO_URING_F_NONBLOCK
)
4269 ret
= sync_file_range(req
->file
, req
->sync
.off
, req
->sync
.len
,
4272 req_set_fail_links(req
);
4273 io_req_complete(req
, ret
);
4277 #if defined(CONFIG_NET)
4278 static int io_setup_async_msg(struct io_kiocb
*req
,
4279 struct io_async_msghdr
*kmsg
)
4281 struct io_async_msghdr
*async_msg
= req
->async_data
;
4285 if (io_alloc_async_data(req
)) {
4286 kfree(kmsg
->free_iov
);
4289 async_msg
= req
->async_data
;
4290 req
->flags
|= REQ_F_NEED_CLEANUP
;
4291 memcpy(async_msg
, kmsg
, sizeof(*kmsg
));
4292 async_msg
->msg
.msg_name
= &async_msg
->addr
;
4293 /* if were using fast_iov, set it to the new one */
4294 if (!async_msg
->free_iov
)
4295 async_msg
->msg
.msg_iter
.iov
= async_msg
->fast_iov
;
4300 static int io_sendmsg_copy_hdr(struct io_kiocb
*req
,
4301 struct io_async_msghdr
*iomsg
)
4303 iomsg
->msg
.msg_name
= &iomsg
->addr
;
4304 iomsg
->free_iov
= iomsg
->fast_iov
;
4305 return sendmsg_copy_msghdr(&iomsg
->msg
, req
->sr_msg
.umsg
,
4306 req
->sr_msg
.msg_flags
, &iomsg
->free_iov
);
4309 static int io_sendmsg_prep_async(struct io_kiocb
*req
)
4313 ret
= io_sendmsg_copy_hdr(req
, req
->async_data
);
4315 req
->flags
|= REQ_F_NEED_CLEANUP
;
4319 static int io_sendmsg_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4321 struct io_sr_msg
*sr
= &req
->sr_msg
;
4323 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4326 sr
->umsg
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4327 sr
->len
= READ_ONCE(sqe
->len
);
4328 sr
->msg_flags
= READ_ONCE(sqe
->msg_flags
) | MSG_NOSIGNAL
;
4329 if (sr
->msg_flags
& MSG_DONTWAIT
)
4330 req
->flags
|= REQ_F_NOWAIT
;
4332 #ifdef CONFIG_COMPAT
4333 if (req
->ctx
->compat
)
4334 sr
->msg_flags
|= MSG_CMSG_COMPAT
;
4339 static int io_sendmsg(struct io_kiocb
*req
, unsigned int issue_flags
)
4341 struct io_async_msghdr iomsg
, *kmsg
;
4342 struct socket
*sock
;
4347 sock
= sock_from_file(req
->file
);
4348 if (unlikely(!sock
))
4351 kmsg
= req
->async_data
;
4353 ret
= io_sendmsg_copy_hdr(req
, &iomsg
);
4359 flags
= req
->sr_msg
.msg_flags
;
4360 if (issue_flags
& IO_URING_F_NONBLOCK
)
4361 flags
|= MSG_DONTWAIT
;
4362 if (flags
& MSG_WAITALL
)
4363 min_ret
= iov_iter_count(&kmsg
->msg
.msg_iter
);
4365 ret
= __sys_sendmsg_sock(sock
, &kmsg
->msg
, flags
);
4366 if ((issue_flags
& IO_URING_F_NONBLOCK
) && ret
== -EAGAIN
)
4367 return io_setup_async_msg(req
, kmsg
);
4368 if (ret
== -ERESTARTSYS
)
4371 /* fast path, check for non-NULL to avoid function call */
4373 kfree(kmsg
->free_iov
);
4374 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
4376 req_set_fail_links(req
);
4377 __io_req_complete(req
, issue_flags
, ret
, 0);
4381 static int io_send(struct io_kiocb
*req
, unsigned int issue_flags
)
4383 struct io_sr_msg
*sr
= &req
->sr_msg
;
4386 struct socket
*sock
;
4391 sock
= sock_from_file(req
->file
);
4392 if (unlikely(!sock
))
4395 ret
= import_single_range(WRITE
, sr
->buf
, sr
->len
, &iov
, &msg
.msg_iter
);
4399 msg
.msg_name
= NULL
;
4400 msg
.msg_control
= NULL
;
4401 msg
.msg_controllen
= 0;
4402 msg
.msg_namelen
= 0;
4404 flags
= req
->sr_msg
.msg_flags
;
4405 if (issue_flags
& IO_URING_F_NONBLOCK
)
4406 flags
|= MSG_DONTWAIT
;
4407 if (flags
& MSG_WAITALL
)
4408 min_ret
= iov_iter_count(&msg
.msg_iter
);
4410 msg
.msg_flags
= flags
;
4411 ret
= sock_sendmsg(sock
, &msg
);
4412 if ((issue_flags
& IO_URING_F_NONBLOCK
) && ret
== -EAGAIN
)
4414 if (ret
== -ERESTARTSYS
)
4418 req_set_fail_links(req
);
4419 __io_req_complete(req
, issue_flags
, ret
, 0);
4423 static int __io_recvmsg_copy_hdr(struct io_kiocb
*req
,
4424 struct io_async_msghdr
*iomsg
)
4426 struct io_sr_msg
*sr
= &req
->sr_msg
;
4427 struct iovec __user
*uiov
;
4431 ret
= __copy_msghdr_from_user(&iomsg
->msg
, sr
->umsg
,
4432 &iomsg
->uaddr
, &uiov
, &iov_len
);
4436 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
4439 if (copy_from_user(iomsg
->fast_iov
, uiov
, sizeof(*uiov
)))
4441 sr
->len
= iomsg
->fast_iov
[0].iov_len
;
4442 iomsg
->free_iov
= NULL
;
4444 iomsg
->free_iov
= iomsg
->fast_iov
;
4445 ret
= __import_iovec(READ
, uiov
, iov_len
, UIO_FASTIOV
,
4446 &iomsg
->free_iov
, &iomsg
->msg
.msg_iter
,
4455 #ifdef CONFIG_COMPAT
4456 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb
*req
,
4457 struct io_async_msghdr
*iomsg
)
4459 struct io_sr_msg
*sr
= &req
->sr_msg
;
4460 struct compat_iovec __user
*uiov
;
4465 ret
= __get_compat_msghdr(&iomsg
->msg
, sr
->umsg_compat
, &iomsg
->uaddr
,
4470 uiov
= compat_ptr(ptr
);
4471 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
4472 compat_ssize_t clen
;
4476 if (!access_ok(uiov
, sizeof(*uiov
)))
4478 if (__get_user(clen
, &uiov
->iov_len
))
4483 iomsg
->free_iov
= NULL
;
4485 iomsg
->free_iov
= iomsg
->fast_iov
;
4486 ret
= __import_iovec(READ
, (struct iovec __user
*)uiov
, len
,
4487 UIO_FASTIOV
, &iomsg
->free_iov
,
4488 &iomsg
->msg
.msg_iter
, true);
4497 static int io_recvmsg_copy_hdr(struct io_kiocb
*req
,
4498 struct io_async_msghdr
*iomsg
)
4500 iomsg
->msg
.msg_name
= &iomsg
->addr
;
4502 #ifdef CONFIG_COMPAT
4503 if (req
->ctx
->compat
)
4504 return __io_compat_recvmsg_copy_hdr(req
, iomsg
);
4507 return __io_recvmsg_copy_hdr(req
, iomsg
);
4510 static struct io_buffer
*io_recv_buffer_select(struct io_kiocb
*req
,
4513 struct io_sr_msg
*sr
= &req
->sr_msg
;
4514 struct io_buffer
*kbuf
;
4516 kbuf
= io_buffer_select(req
, &sr
->len
, sr
->bgid
, sr
->kbuf
, needs_lock
);
4521 req
->flags
|= REQ_F_BUFFER_SELECTED
;
4525 static inline unsigned int io_put_recv_kbuf(struct io_kiocb
*req
)
4527 return io_put_kbuf(req
, req
->sr_msg
.kbuf
);
4530 static int io_recvmsg_prep_async(struct io_kiocb
*req
)
4534 ret
= io_recvmsg_copy_hdr(req
, req
->async_data
);
4536 req
->flags
|= REQ_F_NEED_CLEANUP
;
4540 static int io_recvmsg_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4542 struct io_sr_msg
*sr
= &req
->sr_msg
;
4544 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4547 sr
->umsg
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4548 sr
->len
= READ_ONCE(sqe
->len
);
4549 sr
->bgid
= READ_ONCE(sqe
->buf_group
);
4550 sr
->msg_flags
= READ_ONCE(sqe
->msg_flags
) | MSG_NOSIGNAL
;
4551 if (sr
->msg_flags
& MSG_DONTWAIT
)
4552 req
->flags
|= REQ_F_NOWAIT
;
4554 #ifdef CONFIG_COMPAT
4555 if (req
->ctx
->compat
)
4556 sr
->msg_flags
|= MSG_CMSG_COMPAT
;
4561 static int io_recvmsg(struct io_kiocb
*req
, unsigned int issue_flags
)
4563 struct io_async_msghdr iomsg
, *kmsg
;
4564 struct socket
*sock
;
4565 struct io_buffer
*kbuf
;
4568 int ret
, cflags
= 0;
4569 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4571 sock
= sock_from_file(req
->file
);
4572 if (unlikely(!sock
))
4575 kmsg
= req
->async_data
;
4577 ret
= io_recvmsg_copy_hdr(req
, &iomsg
);
4583 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
4584 kbuf
= io_recv_buffer_select(req
, !force_nonblock
);
4586 return PTR_ERR(kbuf
);
4587 kmsg
->fast_iov
[0].iov_base
= u64_to_user_ptr(kbuf
->addr
);
4588 kmsg
->fast_iov
[0].iov_len
= req
->sr_msg
.len
;
4589 iov_iter_init(&kmsg
->msg
.msg_iter
, READ
, kmsg
->fast_iov
,
4590 1, req
->sr_msg
.len
);
4593 flags
= req
->sr_msg
.msg_flags
;
4595 flags
|= MSG_DONTWAIT
;
4596 if (flags
& MSG_WAITALL
)
4597 min_ret
= iov_iter_count(&kmsg
->msg
.msg_iter
);
4599 ret
= __sys_recvmsg_sock(sock
, &kmsg
->msg
, req
->sr_msg
.umsg
,
4600 kmsg
->uaddr
, flags
);
4601 if (force_nonblock
&& ret
== -EAGAIN
)
4602 return io_setup_async_msg(req
, kmsg
);
4603 if (ret
== -ERESTARTSYS
)
4606 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
4607 cflags
= io_put_recv_kbuf(req
);
4608 /* fast path, check for non-NULL to avoid function call */
4610 kfree(kmsg
->free_iov
);
4611 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
4612 if (ret
< min_ret
|| ((flags
& MSG_WAITALL
) && (kmsg
->msg
.msg_flags
& (MSG_TRUNC
| MSG_CTRUNC
))))
4613 req_set_fail_links(req
);
4614 __io_req_complete(req
, issue_flags
, ret
, cflags
);
4618 static int io_recv(struct io_kiocb
*req
, unsigned int issue_flags
)
4620 struct io_buffer
*kbuf
;
4621 struct io_sr_msg
*sr
= &req
->sr_msg
;
4623 void __user
*buf
= sr
->buf
;
4624 struct socket
*sock
;
4628 int ret
, cflags
= 0;
4629 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4631 sock
= sock_from_file(req
->file
);
4632 if (unlikely(!sock
))
4635 if (req
->flags
& REQ_F_BUFFER_SELECT
) {
4636 kbuf
= io_recv_buffer_select(req
, !force_nonblock
);
4638 return PTR_ERR(kbuf
);
4639 buf
= u64_to_user_ptr(kbuf
->addr
);
4642 ret
= import_single_range(READ
, buf
, sr
->len
, &iov
, &msg
.msg_iter
);
4646 msg
.msg_name
= NULL
;
4647 msg
.msg_control
= NULL
;
4648 msg
.msg_controllen
= 0;
4649 msg
.msg_namelen
= 0;
4650 msg
.msg_iocb
= NULL
;
4653 flags
= req
->sr_msg
.msg_flags
;
4655 flags
|= MSG_DONTWAIT
;
4656 if (flags
& MSG_WAITALL
)
4657 min_ret
= iov_iter_count(&msg
.msg_iter
);
4659 ret
= sock_recvmsg(sock
, &msg
, flags
);
4660 if (force_nonblock
&& ret
== -EAGAIN
)
4662 if (ret
== -ERESTARTSYS
)
4665 if (req
->flags
& REQ_F_BUFFER_SELECTED
)
4666 cflags
= io_put_recv_kbuf(req
);
4667 if (ret
< min_ret
|| ((flags
& MSG_WAITALL
) && (msg
.msg_flags
& (MSG_TRUNC
| MSG_CTRUNC
))))
4668 req_set_fail_links(req
);
4669 __io_req_complete(req
, issue_flags
, ret
, cflags
);
4673 static int io_accept_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4675 struct io_accept
*accept
= &req
->accept
;
4677 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4679 if (sqe
->ioprio
|| sqe
->len
|| sqe
->buf_index
)
4682 accept
->addr
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4683 accept
->addr_len
= u64_to_user_ptr(READ_ONCE(sqe
->addr2
));
4684 accept
->flags
= READ_ONCE(sqe
->accept_flags
);
4685 accept
->nofile
= rlimit(RLIMIT_NOFILE
);
4689 static int io_accept(struct io_kiocb
*req
, unsigned int issue_flags
)
4691 struct io_accept
*accept
= &req
->accept
;
4692 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4693 unsigned int file_flags
= force_nonblock
? O_NONBLOCK
: 0;
4696 if (req
->file
->f_flags
& O_NONBLOCK
)
4697 req
->flags
|= REQ_F_NOWAIT
;
4699 ret
= __sys_accept4_file(req
->file
, file_flags
, accept
->addr
,
4700 accept
->addr_len
, accept
->flags
,
4702 if (ret
== -EAGAIN
&& force_nonblock
)
4705 if (ret
== -ERESTARTSYS
)
4707 req_set_fail_links(req
);
4709 __io_req_complete(req
, issue_flags
, ret
, 0);
4713 static int io_connect_prep_async(struct io_kiocb
*req
)
4715 struct io_async_connect
*io
= req
->async_data
;
4716 struct io_connect
*conn
= &req
->connect
;
4718 return move_addr_to_kernel(conn
->addr
, conn
->addr_len
, &io
->address
);
4721 static int io_connect_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
4723 struct io_connect
*conn
= &req
->connect
;
4725 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
4727 if (sqe
->ioprio
|| sqe
->len
|| sqe
->buf_index
|| sqe
->rw_flags
)
4730 conn
->addr
= u64_to_user_ptr(READ_ONCE(sqe
->addr
));
4731 conn
->addr_len
= READ_ONCE(sqe
->addr2
);
4735 static int io_connect(struct io_kiocb
*req
, unsigned int issue_flags
)
4737 struct io_async_connect __io
, *io
;
4738 unsigned file_flags
;
4740 bool force_nonblock
= issue_flags
& IO_URING_F_NONBLOCK
;
4742 if (req
->async_data
) {
4743 io
= req
->async_data
;
4745 ret
= move_addr_to_kernel(req
->connect
.addr
,
4746 req
->connect
.addr_len
,
4753 file_flags
= force_nonblock
? O_NONBLOCK
: 0;
4755 ret
= __sys_connect_file(req
->file
, &io
->address
,
4756 req
->connect
.addr_len
, file_flags
);
4757 if ((ret
== -EAGAIN
|| ret
== -EINPROGRESS
) && force_nonblock
) {
4758 if (req
->async_data
)
4760 if (io_alloc_async_data(req
)) {
4764 memcpy(req
->async_data
, &__io
, sizeof(__io
));
4767 if (ret
== -ERESTARTSYS
)
4771 req_set_fail_links(req
);
4772 __io_req_complete(req
, issue_flags
, ret
, 0);
4775 #else /* !CONFIG_NET */
4776 #define IO_NETOP_FN(op) \
4777 static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \
4779 return -EOPNOTSUPP; \
4782 #define IO_NETOP_PREP(op) \
4784 static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \
4786 return -EOPNOTSUPP; \
4789 #define IO_NETOP_PREP_ASYNC(op) \
4791 static int io_##op##_prep_async(struct io_kiocb *req) \
4793 return -EOPNOTSUPP; \
4796 IO_NETOP_PREP_ASYNC(sendmsg
);
4797 IO_NETOP_PREP_ASYNC(recvmsg
);
4798 IO_NETOP_PREP_ASYNC(connect
);
4799 IO_NETOP_PREP(accept
);
4802 #endif /* CONFIG_NET */
4804 struct io_poll_table
{
4805 struct poll_table_struct pt
;
4806 struct io_kiocb
*req
;
4810 static int __io_async_wake(struct io_kiocb
*req
, struct io_poll_iocb
*poll
,
4811 __poll_t mask
, task_work_func_t func
)
4815 /* for instances that support it check for an event match first: */
4816 if (mask
&& !(mask
& poll
->events
))
4819 trace_io_uring_task_add(req
->ctx
, req
->opcode
, req
->user_data
, mask
);
4821 list_del_init(&poll
->wait
.entry
);
4824 req
->task_work
.func
= func
;
4827 * If this fails, then the task is exiting. When a task exits, the
4828 * work gets canceled, so just cancel this request as well instead
4829 * of executing it. We can't safely execute it anyway, as we may not
4830 * have the needed state needed for it anyway.
4832 ret
= io_req_task_work_add(req
);
4833 if (unlikely(ret
)) {
4834 WRITE_ONCE(poll
->canceled
, true);
4835 io_req_task_work_add_fallback(req
, func
);
4840 static bool io_poll_rewait(struct io_kiocb
*req
, struct io_poll_iocb
*poll
)
4841 __acquires(&req
->ctx
->completion_lock
)
4843 struct io_ring_ctx
*ctx
= req
->ctx
;
4845 if (!req
->result
&& !READ_ONCE(poll
->canceled
)) {
4846 struct poll_table_struct pt
= { ._key
= poll
->events
};
4848 req
->result
= vfs_poll(req
->file
, &pt
) & poll
->events
;
4851 spin_lock_irq(&ctx
->completion_lock
);
4852 if (!req
->result
&& !READ_ONCE(poll
->canceled
)) {
4853 add_wait_queue(poll
->head
, &poll
->wait
);
4860 static struct io_poll_iocb
*io_poll_get_double(struct io_kiocb
*req
)
4862 /* pure poll stashes this in ->async_data, poll driven retry elsewhere */
4863 if (req
->opcode
== IORING_OP_POLL_ADD
)
4864 return req
->async_data
;
4865 return req
->apoll
->double_poll
;
4868 static struct io_poll_iocb
*io_poll_get_single(struct io_kiocb
*req
)
4870 if (req
->opcode
== IORING_OP_POLL_ADD
)
4872 return &req
->apoll
->poll
;
4875 static void io_poll_remove_double(struct io_kiocb
*req
)
4876 __must_hold(&req
->ctx
->completion_lock
)
4878 struct io_poll_iocb
*poll
= io_poll_get_double(req
);
4880 lockdep_assert_held(&req
->ctx
->completion_lock
);
4882 if (poll
&& poll
->head
) {
4883 struct wait_queue_head
*head
= poll
->head
;
4885 spin_lock(&head
->lock
);
4886 list_del_init(&poll
->wait
.entry
);
4887 if (poll
->wait
.private)
4890 spin_unlock(&head
->lock
);
4894 static bool io_poll_complete(struct io_kiocb
*req
, __poll_t mask
)
4895 __must_hold(&req
->ctx
->completion_lock
)
4897 struct io_ring_ctx
*ctx
= req
->ctx
;
4898 unsigned flags
= IORING_CQE_F_MORE
;
4901 if (READ_ONCE(req
->poll
.canceled
)) {
4903 req
->poll
.events
|= EPOLLONESHOT
;
4905 error
= mangle_poll(mask
);
4907 if (req
->poll
.events
& EPOLLONESHOT
)
4909 if (!io_cqring_fill_event(ctx
, req
->user_data
, error
, flags
)) {
4910 io_poll_remove_waitqs(req
);
4911 req
->poll
.done
= true;
4914 if (flags
& IORING_CQE_F_MORE
)
4917 io_commit_cqring(ctx
);
4918 return !(flags
& IORING_CQE_F_MORE
);
4921 static void io_poll_task_func(struct callback_head
*cb
)
4923 struct io_kiocb
*req
= container_of(cb
, struct io_kiocb
, task_work
);
4924 struct io_ring_ctx
*ctx
= req
->ctx
;
4925 struct io_kiocb
*nxt
;
4927 if (io_poll_rewait(req
, &req
->poll
)) {
4928 spin_unlock_irq(&ctx
->completion_lock
);
4932 done
= io_poll_complete(req
, req
->result
);
4934 hash_del(&req
->hash_node
);
4937 add_wait_queue(req
->poll
.head
, &req
->poll
.wait
);
4939 spin_unlock_irq(&ctx
->completion_lock
);
4940 io_cqring_ev_posted(ctx
);
4943 nxt
= io_put_req_find_next(req
);
4945 __io_req_task_submit(nxt
);
4950 static int io_poll_double_wake(struct wait_queue_entry
*wait
, unsigned mode
,
4951 int sync
, void *key
)
4953 struct io_kiocb
*req
= wait
->private;
4954 struct io_poll_iocb
*poll
= io_poll_get_single(req
);
4955 __poll_t mask
= key_to_poll(key
);
4957 /* for instances that support it check for an event match first: */
4958 if (mask
&& !(mask
& poll
->events
))
4960 if (!(poll
->events
& EPOLLONESHOT
))
4961 return poll
->wait
.func(&poll
->wait
, mode
, sync
, key
);
4963 list_del_init(&wait
->entry
);
4965 if (poll
&& poll
->head
) {
4968 spin_lock(&poll
->head
->lock
);
4969 done
= list_empty(&poll
->wait
.entry
);
4971 list_del_init(&poll
->wait
.entry
);
4972 /* make sure double remove sees this as being gone */
4973 wait
->private = NULL
;
4974 spin_unlock(&poll
->head
->lock
);
4976 /* use wait func handler, so it matches the rq type */
4977 poll
->wait
.func(&poll
->wait
, mode
, sync
, key
);
4984 static void io_init_poll_iocb(struct io_poll_iocb
*poll
, __poll_t events
,
4985 wait_queue_func_t wake_func
)
4989 poll
->canceled
= false;
4990 #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP)
4991 /* mask in events that we always want/need */
4992 poll
->events
= events
| IO_POLL_UNMASK
;
4993 INIT_LIST_HEAD(&poll
->wait
.entry
);
4994 init_waitqueue_func_entry(&poll
->wait
, wake_func
);
4997 static void __io_queue_proc(struct io_poll_iocb
*poll
, struct io_poll_table
*pt
,
4998 struct wait_queue_head
*head
,
4999 struct io_poll_iocb
**poll_ptr
)
5001 struct io_kiocb
*req
= pt
->req
;
5004 * If poll->head is already set, it's because the file being polled
5005 * uses multiple waitqueues for poll handling (eg one for read, one
5006 * for write). Setup a separate io_poll_iocb if this happens.
5008 if (unlikely(poll
->head
)) {
5009 struct io_poll_iocb
*poll_one
= poll
;
5011 /* already have a 2nd entry, fail a third attempt */
5013 pt
->error
= -EINVAL
;
5017 * Can't handle multishot for double wait for now, turn it
5018 * into one-shot mode.
5020 if (!(req
->poll
.events
& EPOLLONESHOT
))
5021 req
->poll
.events
|= EPOLLONESHOT
;
5022 /* double add on the same waitqueue head, ignore */
5023 if (poll
->head
== head
)
5025 poll
= kmalloc(sizeof(*poll
), GFP_ATOMIC
);
5027 pt
->error
= -ENOMEM
;
5030 io_init_poll_iocb(poll
, poll_one
->events
, io_poll_double_wake
);
5032 poll
->wait
.private = req
;
5039 if (poll
->events
& EPOLLEXCLUSIVE
)
5040 add_wait_queue_exclusive(head
, &poll
->wait
);
5042 add_wait_queue(head
, &poll
->wait
);
5045 static void io_async_queue_proc(struct file
*file
, struct wait_queue_head
*head
,
5046 struct poll_table_struct
*p
)
5048 struct io_poll_table
*pt
= container_of(p
, struct io_poll_table
, pt
);
5049 struct async_poll
*apoll
= pt
->req
->apoll
;
5051 __io_queue_proc(&apoll
->poll
, pt
, head
, &apoll
->double_poll
);
5054 static void io_async_task_func(struct callback_head
*cb
)
5056 struct io_kiocb
*req
= container_of(cb
, struct io_kiocb
, task_work
);
5057 struct async_poll
*apoll
= req
->apoll
;
5058 struct io_ring_ctx
*ctx
= req
->ctx
;
5060 trace_io_uring_task_run(req
->ctx
, req
->opcode
, req
->user_data
);
5062 if (io_poll_rewait(req
, &apoll
->poll
)) {
5063 spin_unlock_irq(&ctx
->completion_lock
);
5067 hash_del(&req
->hash_node
);
5068 io_poll_remove_double(req
);
5069 spin_unlock_irq(&ctx
->completion_lock
);
5071 if (!READ_ONCE(apoll
->poll
.canceled
))
5072 __io_req_task_submit(req
);
5074 io_req_complete_failed(req
, -ECANCELED
);
5077 static int io_async_wake(struct wait_queue_entry
*wait
, unsigned mode
, int sync
,
5080 struct io_kiocb
*req
= wait
->private;
5081 struct io_poll_iocb
*poll
= &req
->apoll
->poll
;
5083 trace_io_uring_poll_wake(req
->ctx
, req
->opcode
, req
->user_data
,
5086 return __io_async_wake(req
, poll
, key_to_poll(key
), io_async_task_func
);
5089 static void io_poll_req_insert(struct io_kiocb
*req
)
5091 struct io_ring_ctx
*ctx
= req
->ctx
;
5092 struct hlist_head
*list
;
5094 list
= &ctx
->cancel_hash
[hash_long(req
->user_data
, ctx
->cancel_hash_bits
)];
5095 hlist_add_head(&req
->hash_node
, list
);
5098 static __poll_t
__io_arm_poll_handler(struct io_kiocb
*req
,
5099 struct io_poll_iocb
*poll
,
5100 struct io_poll_table
*ipt
, __poll_t mask
,
5101 wait_queue_func_t wake_func
)
5102 __acquires(&ctx
->completion_lock
)
5104 struct io_ring_ctx
*ctx
= req
->ctx
;
5105 bool cancel
= false;
5107 INIT_HLIST_NODE(&req
->hash_node
);
5108 io_init_poll_iocb(poll
, mask
, wake_func
);
5109 poll
->file
= req
->file
;
5110 poll
->wait
.private = req
;
5112 ipt
->pt
._key
= mask
;
5114 ipt
->error
= -EINVAL
;
5116 mask
= vfs_poll(req
->file
, &ipt
->pt
) & poll
->events
;
5118 spin_lock_irq(&ctx
->completion_lock
);
5119 if (likely(poll
->head
)) {
5120 spin_lock(&poll
->head
->lock
);
5121 if (unlikely(list_empty(&poll
->wait
.entry
))) {
5127 if ((mask
&& (poll
->events
& EPOLLONESHOT
)) || ipt
->error
)
5128 list_del_init(&poll
->wait
.entry
);
5130 WRITE_ONCE(poll
->canceled
, true);
5131 else if (!poll
->done
) /* actually waiting for an event */
5132 io_poll_req_insert(req
);
5133 spin_unlock(&poll
->head
->lock
);
5139 static bool io_arm_poll_handler(struct io_kiocb
*req
)
5141 const struct io_op_def
*def
= &io_op_defs
[req
->opcode
];
5142 struct io_ring_ctx
*ctx
= req
->ctx
;
5143 struct async_poll
*apoll
;
5144 struct io_poll_table ipt
;
5148 if (!req
->file
|| !file_can_poll(req
->file
))
5150 if (req
->flags
& REQ_F_POLLED
)
5154 else if (def
->pollout
)
5158 /* if we can't nonblock try, then no point in arming a poll handler */
5159 if (!io_file_supports_async(req
, rw
))
5162 apoll
= kmalloc(sizeof(*apoll
), GFP_ATOMIC
);
5163 if (unlikely(!apoll
))
5165 apoll
->double_poll
= NULL
;
5167 req
->flags
|= REQ_F_POLLED
;
5170 mask
= EPOLLONESHOT
;
5172 mask
|= POLLIN
| POLLRDNORM
;
5174 mask
|= POLLOUT
| POLLWRNORM
;
5176 /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */
5177 if ((req
->opcode
== IORING_OP_RECVMSG
) &&
5178 (req
->sr_msg
.msg_flags
& MSG_ERRQUEUE
))
5181 mask
|= POLLERR
| POLLPRI
;
5183 ipt
.pt
._qproc
= io_async_queue_proc
;
5185 ret
= __io_arm_poll_handler(req
, &apoll
->poll
, &ipt
, mask
,
5187 if (ret
|| ipt
.error
) {
5188 io_poll_remove_double(req
);
5189 spin_unlock_irq(&ctx
->completion_lock
);
5192 spin_unlock_irq(&ctx
->completion_lock
);
5193 trace_io_uring_poll_arm(ctx
, req
->opcode
, req
->user_data
, mask
,
5194 apoll
->poll
.events
);
5198 static bool __io_poll_remove_one(struct io_kiocb
*req
,
5199 struct io_poll_iocb
*poll
, bool do_cancel
)
5200 __must_hold(&req
->ctx
->completion_lock
)
5202 bool do_complete
= false;
5206 spin_lock(&poll
->head
->lock
);
5208 WRITE_ONCE(poll
->canceled
, true);
5209 if (!list_empty(&poll
->wait
.entry
)) {
5210 list_del_init(&poll
->wait
.entry
);
5213 spin_unlock(&poll
->head
->lock
);
5214 hash_del(&req
->hash_node
);
5218 static bool io_poll_remove_waitqs(struct io_kiocb
*req
)
5219 __must_hold(&req
->ctx
->completion_lock
)
5223 io_poll_remove_double(req
);
5224 do_complete
= __io_poll_remove_one(req
, io_poll_get_single(req
), true);
5226 if (req
->opcode
!= IORING_OP_POLL_ADD
&& do_complete
) {
5227 /* non-poll requests have submit ref still */
5233 static bool io_poll_remove_one(struct io_kiocb
*req
)
5234 __must_hold(&req
->ctx
->completion_lock
)
5238 do_complete
= io_poll_remove_waitqs(req
);
5240 io_cqring_fill_event(req
->ctx
, req
->user_data
, -ECANCELED
, 0);
5241 io_commit_cqring(req
->ctx
);
5242 req_set_fail_links(req
);
5243 io_put_req_deferred(req
, 1);
5250 * Returns true if we found and killed one or more poll requests
5252 static bool io_poll_remove_all(struct io_ring_ctx
*ctx
, struct task_struct
*tsk
,
5253 struct files_struct
*files
)
5255 struct hlist_node
*tmp
;
5256 struct io_kiocb
*req
;
5259 spin_lock_irq(&ctx
->completion_lock
);
5260 for (i
= 0; i
< (1U << ctx
->cancel_hash_bits
); i
++) {
5261 struct hlist_head
*list
;
5263 list
= &ctx
->cancel_hash
[i
];
5264 hlist_for_each_entry_safe(req
, tmp
, list
, hash_node
) {
5265 if (io_match_task(req
, tsk
, files
))
5266 posted
+= io_poll_remove_one(req
);
5269 spin_unlock_irq(&ctx
->completion_lock
);
5272 io_cqring_ev_posted(ctx
);
5277 static struct io_kiocb
*io_poll_find(struct io_ring_ctx
*ctx
, __u64 sqe_addr
,
5279 __must_hold(&ctx
->completion_lock
)
5281 struct hlist_head
*list
;
5282 struct io_kiocb
*req
;
5284 list
= &ctx
->cancel_hash
[hash_long(sqe_addr
, ctx
->cancel_hash_bits
)];
5285 hlist_for_each_entry(req
, list
, hash_node
) {
5286 if (sqe_addr
!= req
->user_data
)
5288 if (poll_only
&& req
->opcode
!= IORING_OP_POLL_ADD
)
5295 static int io_poll_cancel(struct io_ring_ctx
*ctx
, __u64 sqe_addr
,
5297 __must_hold(&ctx
->completion_lock
)
5299 struct io_kiocb
*req
;
5301 req
= io_poll_find(ctx
, sqe_addr
, poll_only
);
5304 if (io_poll_remove_one(req
))
5310 static __poll_t
io_poll_parse_events(const struct io_uring_sqe
*sqe
,
5315 events
= READ_ONCE(sqe
->poll32_events
);
5317 events
= swahw32(events
);
5319 if (!(flags
& IORING_POLL_ADD_MULTI
))
5320 events
|= EPOLLONESHOT
;
5321 return demangle_poll(events
) | (events
& (EPOLLEXCLUSIVE
|EPOLLONESHOT
));
5324 static int io_poll_update_prep(struct io_kiocb
*req
,
5325 const struct io_uring_sqe
*sqe
)
5327 struct io_poll_update
*upd
= &req
->poll_update
;
5330 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
5332 if (sqe
->ioprio
|| sqe
->buf_index
)
5334 flags
= READ_ONCE(sqe
->len
);
5335 if (flags
& ~(IORING_POLL_UPDATE_EVENTS
| IORING_POLL_UPDATE_USER_DATA
|
5336 IORING_POLL_ADD_MULTI
))
5338 /* meaningless without update */
5339 if (flags
== IORING_POLL_ADD_MULTI
)
5342 upd
->old_user_data
= READ_ONCE(sqe
->addr
);
5343 upd
->update_events
= flags
& IORING_POLL_UPDATE_EVENTS
;
5344 upd
->update_user_data
= flags
& IORING_POLL_UPDATE_USER_DATA
;
5346 upd
->new_user_data
= READ_ONCE(sqe
->off
);
5347 if (!upd
->update_user_data
&& upd
->new_user_data
)
5349 if (upd
->update_events
)
5350 upd
->events
= io_poll_parse_events(sqe
, flags
);
5351 else if (sqe
->poll32_events
)
5357 static int io_poll_wake(struct wait_queue_entry
*wait
, unsigned mode
, int sync
,
5360 struct io_kiocb
*req
= wait
->private;
5361 struct io_poll_iocb
*poll
= &req
->poll
;
5363 return __io_async_wake(req
, poll
, key_to_poll(key
), io_poll_task_func
);
5366 static void io_poll_queue_proc(struct file
*file
, struct wait_queue_head
*head
,
5367 struct poll_table_struct
*p
)
5369 struct io_poll_table
*pt
= container_of(p
, struct io_poll_table
, pt
);
5371 __io_queue_proc(&pt
->req
->poll
, pt
, head
, (struct io_poll_iocb
**) &pt
->req
->async_data
);
5374 static int io_poll_add_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
5376 struct io_poll_iocb
*poll
= &req
->poll
;
5379 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
5381 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->off
|| sqe
->addr
)
5383 flags
= READ_ONCE(sqe
->len
);
5384 if (flags
& ~IORING_POLL_ADD_MULTI
)
5387 poll
->events
= io_poll_parse_events(sqe
, flags
);
5391 static int io_poll_add(struct io_kiocb
*req
, unsigned int issue_flags
)
5393 struct io_poll_iocb
*poll
= &req
->poll
;
5394 struct io_ring_ctx
*ctx
= req
->ctx
;
5395 struct io_poll_table ipt
;
5398 ipt
.pt
._qproc
= io_poll_queue_proc
;
5400 mask
= __io_arm_poll_handler(req
, &req
->poll
, &ipt
, poll
->events
,
5403 if (mask
) { /* no async, we'd stolen it */
5405 io_poll_complete(req
, mask
);
5407 spin_unlock_irq(&ctx
->completion_lock
);
5410 io_cqring_ev_posted(ctx
);
5411 if (poll
->events
& EPOLLONESHOT
)
5417 static int io_poll_update(struct io_kiocb
*req
, unsigned int issue_flags
)
5419 struct io_ring_ctx
*ctx
= req
->ctx
;
5420 struct io_kiocb
*preq
;
5424 spin_lock_irq(&ctx
->completion_lock
);
5425 preq
= io_poll_find(ctx
, req
->poll_update
.old_user_data
, true);
5431 if (!req
->poll_update
.update_events
&& !req
->poll_update
.update_user_data
) {
5433 ret
= io_poll_remove_one(preq
) ? 0 : -EALREADY
;
5438 * Don't allow racy completion with singleshot, as we cannot safely
5439 * update those. For multishot, if we're racing with completion, just
5440 * let completion re-add it.
5442 completing
= !__io_poll_remove_one(preq
, &preq
->poll
, false);
5443 if (completing
&& (preq
->poll
.events
& EPOLLONESHOT
)) {
5447 /* we now have a detached poll request. reissue. */
5451 spin_unlock_irq(&ctx
->completion_lock
);
5452 req_set_fail_links(req
);
5453 io_req_complete(req
, ret
);
5456 /* only mask one event flags, keep behavior flags */
5457 if (req
->poll_update
.update_events
) {
5458 preq
->poll
.events
&= ~0xffff;
5459 preq
->poll
.events
|= req
->poll_update
.events
& 0xffff;
5460 preq
->poll
.events
|= IO_POLL_UNMASK
;
5462 if (req
->poll_update
.update_user_data
)
5463 preq
->user_data
= req
->poll_update
.new_user_data
;
5464 spin_unlock_irq(&ctx
->completion_lock
);
5466 /* complete update request, we're done with it */
5467 io_req_complete(req
, ret
);
5470 ret
= io_poll_add(preq
, issue_flags
);
5472 req_set_fail_links(preq
);
5473 io_req_complete(preq
, ret
);
5479 static enum hrtimer_restart
io_timeout_fn(struct hrtimer
*timer
)
5481 struct io_timeout_data
*data
= container_of(timer
,
5482 struct io_timeout_data
, timer
);
5483 struct io_kiocb
*req
= data
->req
;
5484 struct io_ring_ctx
*ctx
= req
->ctx
;
5485 unsigned long flags
;
5487 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
5488 list_del_init(&req
->timeout
.list
);
5489 atomic_set(&req
->ctx
->cq_timeouts
,
5490 atomic_read(&req
->ctx
->cq_timeouts
) + 1);
5492 io_cqring_fill_event(ctx
, req
->user_data
, -ETIME
, 0);
5493 io_commit_cqring(ctx
);
5494 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
5496 io_cqring_ev_posted(ctx
);
5497 req_set_fail_links(req
);
5499 return HRTIMER_NORESTART
;
5502 static struct io_kiocb
*io_timeout_extract(struct io_ring_ctx
*ctx
,
5504 __must_hold(&ctx
->completion_lock
)
5506 struct io_timeout_data
*io
;
5507 struct io_kiocb
*req
;
5510 list_for_each_entry(req
, &ctx
->timeout_list
, timeout
.list
) {
5511 found
= user_data
== req
->user_data
;
5516 return ERR_PTR(-ENOENT
);
5518 io
= req
->async_data
;
5519 if (hrtimer_try_to_cancel(&io
->timer
) == -1)
5520 return ERR_PTR(-EALREADY
);
5521 list_del_init(&req
->timeout
.list
);
5525 static int io_timeout_cancel(struct io_ring_ctx
*ctx
, __u64 user_data
)
5526 __must_hold(&ctx
->completion_lock
)
5528 struct io_kiocb
*req
= io_timeout_extract(ctx
, user_data
);
5531 return PTR_ERR(req
);
5533 req_set_fail_links(req
);
5534 io_cqring_fill_event(ctx
, req
->user_data
, -ECANCELED
, 0);
5535 io_put_req_deferred(req
, 1);
5539 static int io_timeout_update(struct io_ring_ctx
*ctx
, __u64 user_data
,
5540 struct timespec64
*ts
, enum hrtimer_mode mode
)
5541 __must_hold(&ctx
->completion_lock
)
5543 struct io_kiocb
*req
= io_timeout_extract(ctx
, user_data
);
5544 struct io_timeout_data
*data
;
5547 return PTR_ERR(req
);
5549 req
->timeout
.off
= 0; /* noseq */
5550 data
= req
->async_data
;
5551 list_add_tail(&req
->timeout
.list
, &ctx
->timeout_list
);
5552 hrtimer_init(&data
->timer
, CLOCK_MONOTONIC
, mode
);
5553 data
->timer
.function
= io_timeout_fn
;
5554 hrtimer_start(&data
->timer
, timespec64_to_ktime(*ts
), mode
);
5558 static int io_timeout_remove_prep(struct io_kiocb
*req
,
5559 const struct io_uring_sqe
*sqe
)
5561 struct io_timeout_rem
*tr
= &req
->timeout_rem
;
5563 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
5565 if (unlikely(req
->flags
& (REQ_F_FIXED_FILE
| REQ_F_BUFFER_SELECT
)))
5567 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->len
)
5570 tr
->addr
= READ_ONCE(sqe
->addr
);
5571 tr
->flags
= READ_ONCE(sqe
->timeout_flags
);
5572 if (tr
->flags
& IORING_TIMEOUT_UPDATE
) {
5573 if (tr
->flags
& ~(IORING_TIMEOUT_UPDATE
|IORING_TIMEOUT_ABS
))
5575 if (get_timespec64(&tr
->ts
, u64_to_user_ptr(sqe
->addr2
)))
5577 } else if (tr
->flags
) {
5578 /* timeout removal doesn't support flags */
5585 static inline enum hrtimer_mode
io_translate_timeout_mode(unsigned int flags
)
5587 return (flags
& IORING_TIMEOUT_ABS
) ? HRTIMER_MODE_ABS
5592 * Remove or update an existing timeout command
5594 static int io_timeout_remove(struct io_kiocb
*req
, unsigned int issue_flags
)
5596 struct io_timeout_rem
*tr
= &req
->timeout_rem
;
5597 struct io_ring_ctx
*ctx
= req
->ctx
;
5600 spin_lock_irq(&ctx
->completion_lock
);
5601 if (!(req
->timeout_rem
.flags
& IORING_TIMEOUT_UPDATE
))
5602 ret
= io_timeout_cancel(ctx
, tr
->addr
);
5604 ret
= io_timeout_update(ctx
, tr
->addr
, &tr
->ts
,
5605 io_translate_timeout_mode(tr
->flags
));
5607 io_cqring_fill_event(ctx
, req
->user_data
, ret
, 0);
5608 io_commit_cqring(ctx
);
5609 spin_unlock_irq(&ctx
->completion_lock
);
5610 io_cqring_ev_posted(ctx
);
5612 req_set_fail_links(req
);
5617 static int io_timeout_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
,
5618 bool is_timeout_link
)
5620 struct io_timeout_data
*data
;
5622 u32 off
= READ_ONCE(sqe
->off
);
5624 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
5626 if (sqe
->ioprio
|| sqe
->buf_index
|| sqe
->len
!= 1)
5628 if (off
&& is_timeout_link
)
5630 flags
= READ_ONCE(sqe
->timeout_flags
);
5631 if (flags
& ~IORING_TIMEOUT_ABS
)
5634 req
->timeout
.off
= off
;
5636 if (!req
->async_data
&& io_alloc_async_data(req
))
5639 data
= req
->async_data
;
5642 if (get_timespec64(&data
->ts
, u64_to_user_ptr(sqe
->addr
)))
5645 data
->mode
= io_translate_timeout_mode(flags
);
5646 hrtimer_init(&data
->timer
, CLOCK_MONOTONIC
, data
->mode
);
5647 if (is_timeout_link
)
5648 io_req_track_inflight(req
);
5652 static int io_timeout(struct io_kiocb
*req
, unsigned int issue_flags
)
5654 struct io_ring_ctx
*ctx
= req
->ctx
;
5655 struct io_timeout_data
*data
= req
->async_data
;
5656 struct list_head
*entry
;
5657 u32 tail
, off
= req
->timeout
.off
;
5659 spin_lock_irq(&ctx
->completion_lock
);
5662 * sqe->off holds how many events that need to occur for this
5663 * timeout event to be satisfied. If it isn't set, then this is
5664 * a pure timeout request, sequence isn't used.
5666 if (io_is_timeout_noseq(req
)) {
5667 entry
= ctx
->timeout_list
.prev
;
5671 tail
= ctx
->cached_cq_tail
- atomic_read(&ctx
->cq_timeouts
);
5672 req
->timeout
.target_seq
= tail
+ off
;
5674 /* Update the last seq here in case io_flush_timeouts() hasn't.
5675 * This is safe because ->completion_lock is held, and submissions
5676 * and completions are never mixed in the same ->completion_lock section.
5678 ctx
->cq_last_tm_flush
= tail
;
5681 * Insertion sort, ensuring the first entry in the list is always
5682 * the one we need first.
5684 list_for_each_prev(entry
, &ctx
->timeout_list
) {
5685 struct io_kiocb
*nxt
= list_entry(entry
, struct io_kiocb
,
5688 if (io_is_timeout_noseq(nxt
))
5690 /* nxt.seq is behind @tail, otherwise would've been completed */
5691 if (off
>= nxt
->timeout
.target_seq
- tail
)
5695 list_add(&req
->timeout
.list
, entry
);
5696 data
->timer
.function
= io_timeout_fn
;
5697 hrtimer_start(&data
->timer
, timespec64_to_ktime(data
->ts
), data
->mode
);
5698 spin_unlock_irq(&ctx
->completion_lock
);
5702 struct io_cancel_data
{
5703 struct io_ring_ctx
*ctx
;
5707 static bool io_cancel_cb(struct io_wq_work
*work
, void *data
)
5709 struct io_kiocb
*req
= container_of(work
, struct io_kiocb
, work
);
5710 struct io_cancel_data
*cd
= data
;
5712 return req
->ctx
== cd
->ctx
&& req
->user_data
== cd
->user_data
;
5715 static int io_async_cancel_one(struct io_uring_task
*tctx
, u64 user_data
,
5716 struct io_ring_ctx
*ctx
)
5718 struct io_cancel_data data
= { .ctx
= ctx
, .user_data
= user_data
, };
5719 enum io_wq_cancel cancel_ret
;
5722 if (!tctx
|| !tctx
->io_wq
)
5725 cancel_ret
= io_wq_cancel_cb(tctx
->io_wq
, io_cancel_cb
, &data
, false);
5726 switch (cancel_ret
) {
5727 case IO_WQ_CANCEL_OK
:
5730 case IO_WQ_CANCEL_RUNNING
:
5733 case IO_WQ_CANCEL_NOTFOUND
:
5741 static void io_async_find_and_cancel(struct io_ring_ctx
*ctx
,
5742 struct io_kiocb
*req
, __u64 sqe_addr
,
5745 unsigned long flags
;
5748 ret
= io_async_cancel_one(req
->task
->io_uring
, sqe_addr
, ctx
);
5749 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
5752 ret
= io_timeout_cancel(ctx
, sqe_addr
);
5755 ret
= io_poll_cancel(ctx
, sqe_addr
, false);
5759 io_cqring_fill_event(ctx
, req
->user_data
, ret
, 0);
5760 io_commit_cqring(ctx
);
5761 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
5762 io_cqring_ev_posted(ctx
);
5765 req_set_fail_links(req
);
5768 static int io_async_cancel_prep(struct io_kiocb
*req
,
5769 const struct io_uring_sqe
*sqe
)
5771 if (unlikely(req
->ctx
->flags
& IORING_SETUP_IOPOLL
))
5773 if (unlikely(req
->flags
& (REQ_F_FIXED_FILE
| REQ_F_BUFFER_SELECT
)))
5775 if (sqe
->ioprio
|| sqe
->off
|| sqe
->len
|| sqe
->cancel_flags
)
5778 req
->cancel
.addr
= READ_ONCE(sqe
->addr
);
5782 static int io_async_cancel(struct io_kiocb
*req
, unsigned int issue_flags
)
5784 struct io_ring_ctx
*ctx
= req
->ctx
;
5785 u64 sqe_addr
= req
->cancel
.addr
;
5786 struct io_tctx_node
*node
;
5789 /* tasks should wait for their io-wq threads, so safe w/o sync */
5790 ret
= io_async_cancel_one(req
->task
->io_uring
, sqe_addr
, ctx
);
5791 spin_lock_irq(&ctx
->completion_lock
);
5794 ret
= io_timeout_cancel(ctx
, sqe_addr
);
5797 ret
= io_poll_cancel(ctx
, sqe_addr
, false);
5800 spin_unlock_irq(&ctx
->completion_lock
);
5802 /* slow path, try all io-wq's */
5803 io_ring_submit_lock(ctx
, !(issue_flags
& IO_URING_F_NONBLOCK
));
5805 list_for_each_entry(node
, &ctx
->tctx_list
, ctx_node
) {
5806 struct io_uring_task
*tctx
= node
->task
->io_uring
;
5808 ret
= io_async_cancel_one(tctx
, req
->cancel
.addr
, ctx
);
5812 io_ring_submit_unlock(ctx
, !(issue_flags
& IO_URING_F_NONBLOCK
));
5814 spin_lock_irq(&ctx
->completion_lock
);
5816 io_cqring_fill_event(ctx
, req
->user_data
, ret
, 0);
5817 io_commit_cqring(ctx
);
5818 spin_unlock_irq(&ctx
->completion_lock
);
5819 io_cqring_ev_posted(ctx
);
5822 req_set_fail_links(req
);
5827 static int io_rsrc_update_prep(struct io_kiocb
*req
,
5828 const struct io_uring_sqe
*sqe
)
5830 if (unlikely(req
->ctx
->flags
& IORING_SETUP_SQPOLL
))
5832 if (unlikely(req
->flags
& (REQ_F_FIXED_FILE
| REQ_F_BUFFER_SELECT
)))
5834 if (sqe
->ioprio
|| sqe
->rw_flags
)
5837 req
->rsrc_update
.offset
= READ_ONCE(sqe
->off
);
5838 req
->rsrc_update
.nr_args
= READ_ONCE(sqe
->len
);
5839 if (!req
->rsrc_update
.nr_args
)
5841 req
->rsrc_update
.arg
= READ_ONCE(sqe
->addr
);
5845 static int io_files_update(struct io_kiocb
*req
, unsigned int issue_flags
)
5847 struct io_ring_ctx
*ctx
= req
->ctx
;
5848 struct io_uring_rsrc_update2 up
;
5851 if (issue_flags
& IO_URING_F_NONBLOCK
)
5854 up
.offset
= req
->rsrc_update
.offset
;
5855 up
.data
= req
->rsrc_update
.arg
;
5860 mutex_lock(&ctx
->uring_lock
);
5861 ret
= __io_register_rsrc_update(ctx
, IORING_RSRC_FILE
,
5862 &up
, req
->rsrc_update
.nr_args
);
5863 mutex_unlock(&ctx
->uring_lock
);
5866 req_set_fail_links(req
);
5867 __io_req_complete(req
, issue_flags
, ret
, 0);
5871 static int io_req_prep(struct io_kiocb
*req
, const struct io_uring_sqe
*sqe
)
5873 switch (req
->opcode
) {
5876 case IORING_OP_READV
:
5877 case IORING_OP_READ_FIXED
:
5878 case IORING_OP_READ
:
5879 return io_read_prep(req
, sqe
);
5880 case IORING_OP_WRITEV
:
5881 case IORING_OP_WRITE_FIXED
:
5882 case IORING_OP_WRITE
:
5883 return io_write_prep(req
, sqe
);
5884 case IORING_OP_POLL_ADD
:
5885 return io_poll_add_prep(req
, sqe
);
5886 case IORING_OP_POLL_REMOVE
:
5887 return io_poll_update_prep(req
, sqe
);
5888 case IORING_OP_FSYNC
:
5889 return io_fsync_prep(req
, sqe
);
5890 case IORING_OP_SYNC_FILE_RANGE
:
5891 return io_sfr_prep(req
, sqe
);
5892 case IORING_OP_SENDMSG
:
5893 case IORING_OP_SEND
:
5894 return io_sendmsg_prep(req
, sqe
);
5895 case IORING_OP_RECVMSG
:
5896 case IORING_OP_RECV
:
5897 return io_recvmsg_prep(req
, sqe
);
5898 case IORING_OP_CONNECT
:
5899 return io_connect_prep(req
, sqe
);
5900 case IORING_OP_TIMEOUT
:
5901 return io_timeout_prep(req
, sqe
, false);
5902 case IORING_OP_TIMEOUT_REMOVE
:
5903 return io_timeout_remove_prep(req
, sqe
);
5904 case IORING_OP_ASYNC_CANCEL
:
5905 return io_async_cancel_prep(req
, sqe
);
5906 case IORING_OP_LINK_TIMEOUT
:
5907 return io_timeout_prep(req
, sqe
, true);
5908 case IORING_OP_ACCEPT
:
5909 return io_accept_prep(req
, sqe
);
5910 case IORING_OP_FALLOCATE
:
5911 return io_fallocate_prep(req
, sqe
);
5912 case IORING_OP_OPENAT
:
5913 return io_openat_prep(req
, sqe
);
5914 case IORING_OP_CLOSE
:
5915 return io_close_prep(req
, sqe
);
5916 case IORING_OP_FILES_UPDATE
:
5917 return io_rsrc_update_prep(req
, sqe
);
5918 case IORING_OP_STATX
:
5919 return io_statx_prep(req
, sqe
);
5920 case IORING_OP_FADVISE
:
5921 return io_fadvise_prep(req
, sqe
);
5922 case IORING_OP_MADVISE
:
5923 return io_madvise_prep(req
, sqe
);
5924 case IORING_OP_OPENAT2
:
5925 return io_openat2_prep(req
, sqe
);
5926 case IORING_OP_EPOLL_CTL
:
5927 return io_epoll_ctl_prep(req
, sqe
);
5928 case IORING_OP_SPLICE
:
5929 return io_splice_prep(req
, sqe
);
5930 case IORING_OP_PROVIDE_BUFFERS
:
5931 return io_provide_buffers_prep(req
, sqe
);
5932 case IORING_OP_REMOVE_BUFFERS
:
5933 return io_remove_buffers_prep(req
, sqe
);
5935 return io_tee_prep(req
, sqe
);
5936 case IORING_OP_SHUTDOWN
:
5937 return io_shutdown_prep(req
, sqe
);
5938 case IORING_OP_RENAMEAT
:
5939 return io_renameat_prep(req
, sqe
);
5940 case IORING_OP_UNLINKAT
:
5941 return io_unlinkat_prep(req
, sqe
);
5944 printk_once(KERN_WARNING
"io_uring: unhandled opcode %d\n",
5949 static int io_req_prep_async(struct io_kiocb
*req
)
5951 if (!io_op_defs
[req
->opcode
].needs_async_setup
)
5953 if (WARN_ON_ONCE(req
->async_data
))
5955 if (io_alloc_async_data(req
))
5958 switch (req
->opcode
) {
5959 case IORING_OP_READV
:
5960 return io_rw_prep_async(req
, READ
);
5961 case IORING_OP_WRITEV
:
5962 return io_rw_prep_async(req
, WRITE
);
5963 case IORING_OP_SENDMSG
:
5964 return io_sendmsg_prep_async(req
);
5965 case IORING_OP_RECVMSG
:
5966 return io_recvmsg_prep_async(req
);
5967 case IORING_OP_CONNECT
:
5968 return io_connect_prep_async(req
);
5970 printk_once(KERN_WARNING
"io_uring: prep_async() bad opcode %d\n",
5975 static u32
io_get_sequence(struct io_kiocb
*req
)
5977 struct io_kiocb
*pos
;
5978 struct io_ring_ctx
*ctx
= req
->ctx
;
5979 u32 total_submitted
, nr_reqs
= 0;
5981 io_for_each_link(pos
, req
)
5984 total_submitted
= ctx
->cached_sq_head
- ctx
->cached_sq_dropped
;
5985 return total_submitted
- nr_reqs
;
5988 static int io_req_defer(struct io_kiocb
*req
)
5990 struct io_ring_ctx
*ctx
= req
->ctx
;
5991 struct io_defer_entry
*de
;
5995 /* Still need defer if there is pending req in defer list. */
5996 if (likely(list_empty_careful(&ctx
->defer_list
) &&
5997 !(req
->flags
& REQ_F_IO_DRAIN
)))
6000 seq
= io_get_sequence(req
);
6001 /* Still a chance to pass the sequence check */
6002 if (!req_need_defer(req
, seq
) && list_empty_careful(&ctx
->defer_list
))
6005 ret
= io_req_prep_async(req
);
6008 io_prep_async_link(req
);
6009 de
= kmalloc(sizeof(*de
), GFP_KERNEL
);
6013 spin_lock_irq(&ctx
->completion_lock
);
6014 if (!req_need_defer(req
, seq
) && list_empty(&ctx
->defer_list
)) {
6015 spin_unlock_irq(&ctx
->completion_lock
);
6017 io_queue_async_work(req
);
6018 return -EIOCBQUEUED
;
6021 trace_io_uring_defer(ctx
, req
, req
->user_data
);
6024 list_add_tail(&de
->list
, &ctx
->defer_list
);
6025 spin_unlock_irq(&ctx
->completion_lock
);
6026 return -EIOCBQUEUED
;
6029 static void io_clean_op(struct io_kiocb
*req
)
6031 if (req
->flags
& REQ_F_BUFFER_SELECTED
) {
6032 switch (req
->opcode
) {
6033 case IORING_OP_READV
:
6034 case IORING_OP_READ_FIXED
:
6035 case IORING_OP_READ
:
6036 kfree((void *)(unsigned long)req
->rw
.addr
);
6038 case IORING_OP_RECVMSG
:
6039 case IORING_OP_RECV
:
6040 kfree(req
->sr_msg
.kbuf
);
6043 req
->flags
&= ~REQ_F_BUFFER_SELECTED
;
6046 if (req
->flags
& REQ_F_NEED_CLEANUP
) {
6047 switch (req
->opcode
) {
6048 case IORING_OP_READV
:
6049 case IORING_OP_READ_FIXED
:
6050 case IORING_OP_READ
:
6051 case IORING_OP_WRITEV
:
6052 case IORING_OP_WRITE_FIXED
:
6053 case IORING_OP_WRITE
: {
6054 struct io_async_rw
*io
= req
->async_data
;
6056 kfree(io
->free_iovec
);
6059 case IORING_OP_RECVMSG
:
6060 case IORING_OP_SENDMSG
: {
6061 struct io_async_msghdr
*io
= req
->async_data
;
6063 kfree(io
->free_iov
);
6066 case IORING_OP_SPLICE
:
6068 if (!(req
->splice
.flags
& SPLICE_F_FD_IN_FIXED
))
6069 io_put_file(req
->splice
.file_in
);
6071 case IORING_OP_OPENAT
:
6072 case IORING_OP_OPENAT2
:
6073 if (req
->open
.filename
)
6074 putname(req
->open
.filename
);
6076 case IORING_OP_RENAMEAT
:
6077 putname(req
->rename
.oldpath
);
6078 putname(req
->rename
.newpath
);
6080 case IORING_OP_UNLINKAT
:
6081 putname(req
->unlink
.filename
);
6084 req
->flags
&= ~REQ_F_NEED_CLEANUP
;
6086 if ((req
->flags
& REQ_F_POLLED
) && req
->apoll
) {
6087 kfree(req
->apoll
->double_poll
);
6091 if (req
->flags
& REQ_F_INFLIGHT
) {
6092 struct io_uring_task
*tctx
= req
->task
->io_uring
;
6094 atomic_dec(&tctx
->inflight_tracked
);
6095 req
->flags
&= ~REQ_F_INFLIGHT
;
6099 static int io_issue_sqe(struct io_kiocb
*req
, unsigned int issue_flags
)
6101 struct io_ring_ctx
*ctx
= req
->ctx
;
6102 const struct cred
*creds
= NULL
;
6105 if (req
->work
.creds
&& req
->work
.creds
!= current_cred())
6106 creds
= override_creds(req
->work
.creds
);
6108 switch (req
->opcode
) {
6110 ret
= io_nop(req
, issue_flags
);
6112 case IORING_OP_READV
:
6113 case IORING_OP_READ_FIXED
:
6114 case IORING_OP_READ
:
6115 ret
= io_read(req
, issue_flags
);
6117 case IORING_OP_WRITEV
:
6118 case IORING_OP_WRITE_FIXED
:
6119 case IORING_OP_WRITE
:
6120 ret
= io_write(req
, issue_flags
);
6122 case IORING_OP_FSYNC
:
6123 ret
= io_fsync(req
, issue_flags
);
6125 case IORING_OP_POLL_ADD
:
6126 ret
= io_poll_add(req
, issue_flags
);
6128 case IORING_OP_POLL_REMOVE
:
6129 ret
= io_poll_update(req
, issue_flags
);
6131 case IORING_OP_SYNC_FILE_RANGE
:
6132 ret
= io_sync_file_range(req
, issue_flags
);
6134 case IORING_OP_SENDMSG
:
6135 ret
= io_sendmsg(req
, issue_flags
);
6137 case IORING_OP_SEND
:
6138 ret
= io_send(req
, issue_flags
);
6140 case IORING_OP_RECVMSG
:
6141 ret
= io_recvmsg(req
, issue_flags
);
6143 case IORING_OP_RECV
:
6144 ret
= io_recv(req
, issue_flags
);
6146 case IORING_OP_TIMEOUT
:
6147 ret
= io_timeout(req
, issue_flags
);
6149 case IORING_OP_TIMEOUT_REMOVE
:
6150 ret
= io_timeout_remove(req
, issue_flags
);
6152 case IORING_OP_ACCEPT
:
6153 ret
= io_accept(req
, issue_flags
);
6155 case IORING_OP_CONNECT
:
6156 ret
= io_connect(req
, issue_flags
);
6158 case IORING_OP_ASYNC_CANCEL
:
6159 ret
= io_async_cancel(req
, issue_flags
);
6161 case IORING_OP_FALLOCATE
:
6162 ret
= io_fallocate(req
, issue_flags
);
6164 case IORING_OP_OPENAT
:
6165 ret
= io_openat(req
, issue_flags
);
6167 case IORING_OP_CLOSE
:
6168 ret
= io_close(req
, issue_flags
);
6170 case IORING_OP_FILES_UPDATE
:
6171 ret
= io_files_update(req
, issue_flags
);
6173 case IORING_OP_STATX
:
6174 ret
= io_statx(req
, issue_flags
);
6176 case IORING_OP_FADVISE
:
6177 ret
= io_fadvise(req
, issue_flags
);
6179 case IORING_OP_MADVISE
:
6180 ret
= io_madvise(req
, issue_flags
);
6182 case IORING_OP_OPENAT2
:
6183 ret
= io_openat2(req
, issue_flags
);
6185 case IORING_OP_EPOLL_CTL
:
6186 ret
= io_epoll_ctl(req
, issue_flags
);
6188 case IORING_OP_SPLICE
:
6189 ret
= io_splice(req
, issue_flags
);
6191 case IORING_OP_PROVIDE_BUFFERS
:
6192 ret
= io_provide_buffers(req
, issue_flags
);
6194 case IORING_OP_REMOVE_BUFFERS
:
6195 ret
= io_remove_buffers(req
, issue_flags
);
6198 ret
= io_tee(req
, issue_flags
);
6200 case IORING_OP_SHUTDOWN
:
6201 ret
= io_shutdown(req
, issue_flags
);
6203 case IORING_OP_RENAMEAT
:
6204 ret
= io_renameat(req
, issue_flags
);
6206 case IORING_OP_UNLINKAT
:
6207 ret
= io_unlinkat(req
, issue_flags
);
6215 revert_creds(creds
);
6220 /* If the op doesn't have a file, we're not polling for it */
6221 if ((ctx
->flags
& IORING_SETUP_IOPOLL
) && req
->file
) {
6222 const bool in_async
= io_wq_current_is_worker();
6224 /* workqueue context doesn't hold uring_lock, grab it now */
6226 mutex_lock(&ctx
->uring_lock
);
6228 io_iopoll_req_issued(req
, in_async
);
6231 mutex_unlock(&ctx
->uring_lock
);
6237 static void io_wq_submit_work(struct io_wq_work
*work
)
6239 struct io_kiocb
*req
= container_of(work
, struct io_kiocb
, work
);
6240 struct io_kiocb
*timeout
;
6243 timeout
= io_prep_linked_timeout(req
);
6245 io_queue_linked_timeout(timeout
);
6247 if (work
->flags
& IO_WQ_WORK_CANCEL
)
6252 ret
= io_issue_sqe(req
, 0);
6254 * We can get EAGAIN for polled IO even though we're
6255 * forcing a sync submission from here, since we can't
6256 * wait for request slots on the block side.
6264 /* avoid locking problems by failing it from a clean context */
6266 /* io-wq is going to take one down */
6268 io_req_task_queue_fail(req
, ret
);
6272 #define FFS_ASYNC_READ 0x1UL
6273 #define FFS_ASYNC_WRITE 0x2UL
6275 #define FFS_ISREG 0x4UL
6277 #define FFS_ISREG 0x0UL
6279 #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG)
6281 static inline struct io_fixed_file
*io_fixed_file_slot(struct io_file_table
*table
,
6284 struct io_fixed_file
*table_l2
;
6286 table_l2
= table
->files
[i
>> IORING_FILE_TABLE_SHIFT
];
6287 return &table_l2
[i
& IORING_FILE_TABLE_MASK
];
6290 static inline struct file
*io_file_from_index(struct io_ring_ctx
*ctx
,
6293 struct io_fixed_file
*slot
= io_fixed_file_slot(&ctx
->file_table
, index
);
6295 return (struct file
*) (slot
->file_ptr
& FFS_MASK
);
6298 static void io_fixed_file_set(struct io_fixed_file
*file_slot
, struct file
*file
)
6300 unsigned long file_ptr
= (unsigned long) file
;
6302 if (__io_file_supports_async(file
, READ
))
6303 file_ptr
|= FFS_ASYNC_READ
;
6304 if (__io_file_supports_async(file
, WRITE
))
6305 file_ptr
|= FFS_ASYNC_WRITE
;
6306 if (S_ISREG(file_inode(file
)->i_mode
))
6307 file_ptr
|= FFS_ISREG
;
6308 file_slot
->file_ptr
= file_ptr
;
6311 static struct file
*io_file_get(struct io_submit_state
*state
,
6312 struct io_kiocb
*req
, int fd
, bool fixed
)
6314 struct io_ring_ctx
*ctx
= req
->ctx
;
6318 unsigned long file_ptr
;
6320 if (unlikely((unsigned int)fd
>= ctx
->nr_user_files
))
6322 fd
= array_index_nospec(fd
, ctx
->nr_user_files
);
6323 file_ptr
= io_fixed_file_slot(&ctx
->file_table
, fd
)->file_ptr
;
6324 file
= (struct file
*) (file_ptr
& FFS_MASK
);
6325 file_ptr
&= ~FFS_MASK
;
6326 /* mask in overlapping REQ_F and FFS bits */
6327 req
->flags
|= (file_ptr
<< REQ_F_ASYNC_READ_BIT
);
6328 io_req_set_rsrc_node(req
);
6330 trace_io_uring_file_get(ctx
, fd
);
6331 file
= __io_file_get(state
, fd
);
6333 /* we don't allow fixed io_uring files */
6334 if (file
&& unlikely(file
->f_op
== &io_uring_fops
))
6335 io_req_track_inflight(req
);
6341 static enum hrtimer_restart
io_link_timeout_fn(struct hrtimer
*timer
)
6343 struct io_timeout_data
*data
= container_of(timer
,
6344 struct io_timeout_data
, timer
);
6345 struct io_kiocb
*prev
, *req
= data
->req
;
6346 struct io_ring_ctx
*ctx
= req
->ctx
;
6347 unsigned long flags
;
6349 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
6350 prev
= req
->timeout
.head
;
6351 req
->timeout
.head
= NULL
;
6354 * We don't expect the list to be empty, that will only happen if we
6355 * race with the completion of the linked work.
6357 if (prev
&& req_ref_inc_not_zero(prev
))
6358 io_remove_next_linked(prev
);
6361 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
6364 io_async_find_and_cancel(ctx
, req
, prev
->user_data
, -ETIME
);
6365 io_put_req_deferred(prev
, 1);
6367 io_req_complete_post(req
, -ETIME
, 0);
6369 io_put_req_deferred(req
, 1);
6370 return HRTIMER_NORESTART
;
6373 static void io_queue_linked_timeout(struct io_kiocb
*req
)
6375 struct io_ring_ctx
*ctx
= req
->ctx
;
6377 spin_lock_irq(&ctx
->completion_lock
);
6379 * If the back reference is NULL, then our linked request finished
6380 * before we got a chance to setup the timer
6382 if (req
->timeout
.head
) {
6383 struct io_timeout_data
*data
= req
->async_data
;
6385 data
->timer
.function
= io_link_timeout_fn
;
6386 hrtimer_start(&data
->timer
, timespec64_to_ktime(data
->ts
),
6389 spin_unlock_irq(&ctx
->completion_lock
);
6390 /* drop submission reference */
6394 static struct io_kiocb
*io_prep_linked_timeout(struct io_kiocb
*req
)
6396 struct io_kiocb
*nxt
= req
->link
;
6398 if (!nxt
|| (req
->flags
& REQ_F_LINK_TIMEOUT
) ||
6399 nxt
->opcode
!= IORING_OP_LINK_TIMEOUT
)
6402 nxt
->timeout
.head
= req
;
6403 nxt
->flags
|= REQ_F_LTIMEOUT_ACTIVE
;
6404 req
->flags
|= REQ_F_LINK_TIMEOUT
;
6408 static void __io_queue_sqe(struct io_kiocb
*req
)
6410 struct io_kiocb
*linked_timeout
= io_prep_linked_timeout(req
);
6413 ret
= io_issue_sqe(req
, IO_URING_F_NONBLOCK
|IO_URING_F_COMPLETE_DEFER
);
6416 * We async punt it if the file wasn't marked NOWAIT, or if the file
6417 * doesn't support non-blocking read/write attempts
6420 /* drop submission reference */
6421 if (req
->flags
& REQ_F_COMPLETE_INLINE
) {
6422 struct io_ring_ctx
*ctx
= req
->ctx
;
6423 struct io_comp_state
*cs
= &ctx
->submit_state
.comp
;
6425 cs
->reqs
[cs
->nr
++] = req
;
6426 if (cs
->nr
== ARRAY_SIZE(cs
->reqs
))
6427 io_submit_flush_completions(cs
, ctx
);
6431 } else if (ret
== -EAGAIN
&& !(req
->flags
& REQ_F_NOWAIT
)) {
6432 if (!io_arm_poll_handler(req
)) {
6434 * Queued up for async execution, worker will release
6435 * submit reference when the iocb is actually submitted.
6437 io_queue_async_work(req
);
6440 io_req_complete_failed(req
, ret
);
6443 io_queue_linked_timeout(linked_timeout
);
6446 static void io_queue_sqe(struct io_kiocb
*req
)
6450 ret
= io_req_defer(req
);
6452 if (ret
!= -EIOCBQUEUED
) {
6454 io_req_complete_failed(req
, ret
);
6456 } else if (req
->flags
& REQ_F_FORCE_ASYNC
) {
6457 ret
= io_req_prep_async(req
);
6460 io_queue_async_work(req
);
6462 __io_queue_sqe(req
);
6467 * Check SQE restrictions (opcode and flags).
6469 * Returns 'true' if SQE is allowed, 'false' otherwise.
6471 static inline bool io_check_restriction(struct io_ring_ctx
*ctx
,
6472 struct io_kiocb
*req
,
6473 unsigned int sqe_flags
)
6475 if (!ctx
->restricted
)
6478 if (!test_bit(req
->opcode
, ctx
->restrictions
.sqe_op
))
6481 if ((sqe_flags
& ctx
->restrictions
.sqe_flags_required
) !=
6482 ctx
->restrictions
.sqe_flags_required
)
6485 if (sqe_flags
& ~(ctx
->restrictions
.sqe_flags_allowed
|
6486 ctx
->restrictions
.sqe_flags_required
))
6492 static int io_init_req(struct io_ring_ctx
*ctx
, struct io_kiocb
*req
,
6493 const struct io_uring_sqe
*sqe
)
6495 struct io_submit_state
*state
;
6496 unsigned int sqe_flags
;
6497 int personality
, ret
= 0;
6499 req
->opcode
= READ_ONCE(sqe
->opcode
);
6500 /* same numerical values with corresponding REQ_F_*, safe to copy */
6501 req
->flags
= sqe_flags
= READ_ONCE(sqe
->flags
);
6502 req
->user_data
= READ_ONCE(sqe
->user_data
);
6503 req
->async_data
= NULL
;
6507 req
->fixed_rsrc_refs
= NULL
;
6508 /* one is dropped after submission, the other at completion */
6509 atomic_set(&req
->refs
, 2);
6510 req
->task
= current
;
6512 req
->work
.creds
= NULL
;
6514 /* enforce forwards compatibility on users */
6515 if (unlikely(sqe_flags
& ~SQE_VALID_FLAGS
))
6517 if (unlikely(req
->opcode
>= IORING_OP_LAST
))
6519 if (unlikely(!io_check_restriction(ctx
, req
, sqe_flags
)))
6522 if ((sqe_flags
& IOSQE_BUFFER_SELECT
) &&
6523 !io_op_defs
[req
->opcode
].buffer_select
)
6526 personality
= READ_ONCE(sqe
->personality
);
6528 req
->work
.creds
= xa_load(&ctx
->personalities
, personality
);
6529 if (!req
->work
.creds
)
6531 get_cred(req
->work
.creds
);
6533 state
= &ctx
->submit_state
;
6536 * Plug now if we have more than 1 IO left after this, and the target
6537 * is potentially a read/write to block based storage.
6539 if (!state
->plug_started
&& state
->ios_left
> 1 &&
6540 io_op_defs
[req
->opcode
].plug
) {
6541 blk_start_plug(&state
->plug
);
6542 state
->plug_started
= true;
6545 if (io_op_defs
[req
->opcode
].needs_file
) {
6546 bool fixed
= req
->flags
& REQ_F_FIXED_FILE
;
6548 req
->file
= io_file_get(state
, req
, READ_ONCE(sqe
->fd
), fixed
);
6549 if (unlikely(!req
->file
))
6557 static int io_submit_sqe(struct io_ring_ctx
*ctx
, struct io_kiocb
*req
,
6558 const struct io_uring_sqe
*sqe
)
6560 struct io_submit_link
*link
= &ctx
->submit_state
.link
;
6563 ret
= io_init_req(ctx
, req
, sqe
);
6564 if (unlikely(ret
)) {
6567 /* fail even hard links since we don't submit */
6568 link
->head
->flags
|= REQ_F_FAIL_LINK
;
6569 io_req_complete_failed(link
->head
, -ECANCELED
);
6572 io_req_complete_failed(req
, ret
);
6575 ret
= io_req_prep(req
, sqe
);
6579 /* don't need @sqe from now on */
6580 trace_io_uring_submit_sqe(ctx
, req
->opcode
, req
->user_data
,
6581 true, ctx
->flags
& IORING_SETUP_SQPOLL
);
6584 * If we already have a head request, queue this one for async
6585 * submittal once the head completes. If we don't have a head but
6586 * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be
6587 * submitted sync once the chain is complete. If none of those
6588 * conditions are true (normal request), then just queue it.
6591 struct io_kiocb
*head
= link
->head
;
6594 * Taking sequential execution of a link, draining both sides
6595 * of the link also fullfils IOSQE_IO_DRAIN semantics for all
6596 * requests in the link. So, it drains the head and the
6597 * next after the link request. The last one is done via
6598 * drain_next flag to persist the effect across calls.
6600 if (req
->flags
& REQ_F_IO_DRAIN
) {
6601 head
->flags
|= REQ_F_IO_DRAIN
;
6602 ctx
->drain_next
= 1;
6604 ret
= io_req_prep_async(req
);
6607 trace_io_uring_link(ctx
, req
, head
);
6608 link
->last
->link
= req
;
6611 /* last request of a link, enqueue the link */
6612 if (!(req
->flags
& (REQ_F_LINK
| REQ_F_HARDLINK
))) {
6617 if (unlikely(ctx
->drain_next
)) {
6618 req
->flags
|= REQ_F_IO_DRAIN
;
6619 ctx
->drain_next
= 0;
6621 if (req
->flags
& (REQ_F_LINK
| REQ_F_HARDLINK
)) {
6633 * Batched submission is done, ensure local IO is flushed out.
6635 static void io_submit_state_end(struct io_submit_state
*state
,
6636 struct io_ring_ctx
*ctx
)
6638 if (state
->link
.head
)
6639 io_queue_sqe(state
->link
.head
);
6641 io_submit_flush_completions(&state
->comp
, ctx
);
6642 if (state
->plug_started
)
6643 blk_finish_plug(&state
->plug
);
6644 io_state_file_put(state
);
6648 * Start submission side cache.
6650 static void io_submit_state_start(struct io_submit_state
*state
,
6651 unsigned int max_ios
)
6653 state
->plug_started
= false;
6654 state
->ios_left
= max_ios
;
6655 /* set only head, no need to init link_last in advance */
6656 state
->link
.head
= NULL
;
6659 static void io_commit_sqring(struct io_ring_ctx
*ctx
)
6661 struct io_rings
*rings
= ctx
->rings
;
6664 * Ensure any loads from the SQEs are done at this point,
6665 * since once we write the new head, the application could
6666 * write new data to them.
6668 smp_store_release(&rings
->sq
.head
, ctx
->cached_sq_head
);
6672 * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory
6673 * that is mapped by userspace. This means that care needs to be taken to
6674 * ensure that reads are stable, as we cannot rely on userspace always
6675 * being a good citizen. If members of the sqe are validated and then later
6676 * used, it's important that those reads are done through READ_ONCE() to
6677 * prevent a re-load down the line.
6679 static const struct io_uring_sqe
*io_get_sqe(struct io_ring_ctx
*ctx
)
6681 u32
*sq_array
= ctx
->sq_array
;
6685 * The cached sq head (or cq tail) serves two purposes:
6687 * 1) allows us to batch the cost of updating the user visible
6689 * 2) allows the kernel side to track the head on its own, even
6690 * though the application is the one updating it.
6692 head
= READ_ONCE(sq_array
[ctx
->cached_sq_head
++ & ctx
->sq_mask
]);
6693 if (likely(head
< ctx
->sq_entries
))
6694 return &ctx
->sq_sqes
[head
];
6696 /* drop invalid entries */
6697 ctx
->cached_sq_dropped
++;
6698 WRITE_ONCE(ctx
->rings
->sq_dropped
, ctx
->cached_sq_dropped
);
6702 static int io_submit_sqes(struct io_ring_ctx
*ctx
, unsigned int nr
)
6706 /* make sure SQ entry isn't read before tail */
6707 nr
= min3(nr
, ctx
->sq_entries
, io_sqring_entries(ctx
));
6709 if (!percpu_ref_tryget_many(&ctx
->refs
, nr
))
6712 percpu_counter_add(¤t
->io_uring
->inflight
, nr
);
6713 refcount_add(nr
, ¤t
->usage
);
6714 io_submit_state_start(&ctx
->submit_state
, nr
);
6716 while (submitted
< nr
) {
6717 const struct io_uring_sqe
*sqe
;
6718 struct io_kiocb
*req
;
6720 req
= io_alloc_req(ctx
);
6721 if (unlikely(!req
)) {
6723 submitted
= -EAGAIN
;
6726 sqe
= io_get_sqe(ctx
);
6727 if (unlikely(!sqe
)) {
6728 kmem_cache_free(req_cachep
, req
);
6731 /* will complete beyond this point, count as submitted */
6733 if (io_submit_sqe(ctx
, req
, sqe
))
6737 if (unlikely(submitted
!= nr
)) {
6738 int ref_used
= (submitted
== -EAGAIN
) ? 0 : submitted
;
6739 struct io_uring_task
*tctx
= current
->io_uring
;
6740 int unused
= nr
- ref_used
;
6742 percpu_ref_put_many(&ctx
->refs
, unused
);
6743 percpu_counter_sub(&tctx
->inflight
, unused
);
6744 put_task_struct_many(current
, unused
);
6747 io_submit_state_end(&ctx
->submit_state
, ctx
);
6748 /* Commit SQ ring head once we've consumed and submitted all SQEs */
6749 io_commit_sqring(ctx
);
6754 static inline void io_ring_set_wakeup_flag(struct io_ring_ctx
*ctx
)
6756 /* Tell userspace we may need a wakeup call */
6757 spin_lock_irq(&ctx
->completion_lock
);
6758 ctx
->rings
->sq_flags
|= IORING_SQ_NEED_WAKEUP
;
6759 spin_unlock_irq(&ctx
->completion_lock
);
6762 static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx
*ctx
)
6764 spin_lock_irq(&ctx
->completion_lock
);
6765 ctx
->rings
->sq_flags
&= ~IORING_SQ_NEED_WAKEUP
;
6766 spin_unlock_irq(&ctx
->completion_lock
);
6769 static int __io_sq_thread(struct io_ring_ctx
*ctx
, bool cap_entries
)
6771 unsigned int to_submit
;
6774 to_submit
= io_sqring_entries(ctx
);
6775 /* if we're handling multiple rings, cap submit size for fairness */
6776 if (cap_entries
&& to_submit
> 8)
6779 if (!list_empty(&ctx
->iopoll_list
) || to_submit
) {
6780 unsigned nr_events
= 0;
6782 mutex_lock(&ctx
->uring_lock
);
6783 if (!list_empty(&ctx
->iopoll_list
))
6784 io_do_iopoll(ctx
, &nr_events
, 0);
6787 * Don't submit if refs are dying, good for io_uring_register(),
6788 * but also it is relied upon by io_ring_exit_work()
6790 if (to_submit
&& likely(!percpu_ref_is_dying(&ctx
->refs
)) &&
6791 !(ctx
->flags
& IORING_SETUP_R_DISABLED
))
6792 ret
= io_submit_sqes(ctx
, to_submit
);
6793 mutex_unlock(&ctx
->uring_lock
);
6796 if (!io_sqring_full(ctx
) && wq_has_sleeper(&ctx
->sqo_sq_wait
))
6797 wake_up(&ctx
->sqo_sq_wait
);
6802 static void io_sqd_update_thread_idle(struct io_sq_data
*sqd
)
6804 struct io_ring_ctx
*ctx
;
6805 unsigned sq_thread_idle
= 0;
6807 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
)
6808 sq_thread_idle
= max(sq_thread_idle
, ctx
->sq_thread_idle
);
6809 sqd
->sq_thread_idle
= sq_thread_idle
;
6812 static int io_sq_thread(void *data
)
6814 struct io_sq_data
*sqd
= data
;
6815 struct io_ring_ctx
*ctx
;
6816 unsigned long timeout
= 0;
6817 char buf
[TASK_COMM_LEN
];
6820 snprintf(buf
, sizeof(buf
), "iou-sqp-%d", sqd
->task_pid
);
6821 set_task_comm(current
, buf
);
6823 if (sqd
->sq_cpu
!= -1)
6824 set_cpus_allowed_ptr(current
, cpumask_of(sqd
->sq_cpu
));
6826 set_cpus_allowed_ptr(current
, cpu_online_mask
);
6827 current
->flags
|= PF_NO_SETAFFINITY
;
6829 mutex_lock(&sqd
->lock
);
6830 /* a user may had exited before the thread started */
6831 io_run_task_work_head(&sqd
->park_task_work
);
6833 while (!test_bit(IO_SQ_THREAD_SHOULD_STOP
, &sqd
->state
)) {
6835 bool cap_entries
, sqt_spin
, needs_sched
;
6837 if (test_bit(IO_SQ_THREAD_SHOULD_PARK
, &sqd
->state
) ||
6838 signal_pending(current
)) {
6839 bool did_sig
= false;
6841 mutex_unlock(&sqd
->lock
);
6842 if (signal_pending(current
)) {
6843 struct ksignal ksig
;
6845 did_sig
= get_signal(&ksig
);
6848 mutex_lock(&sqd
->lock
);
6850 io_run_task_work_head(&sqd
->park_task_work
);
6853 timeout
= jiffies
+ sqd
->sq_thread_idle
;
6857 cap_entries
= !list_is_singular(&sqd
->ctx_list
);
6858 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
) {
6859 const struct cred
*creds
= NULL
;
6861 if (ctx
->sq_creds
!= current_cred())
6862 creds
= override_creds(ctx
->sq_creds
);
6863 ret
= __io_sq_thread(ctx
, cap_entries
);
6865 revert_creds(creds
);
6866 if (!sqt_spin
&& (ret
> 0 || !list_empty(&ctx
->iopoll_list
)))
6870 if (sqt_spin
|| !time_after(jiffies
, timeout
)) {
6874 timeout
= jiffies
+ sqd
->sq_thread_idle
;
6878 prepare_to_wait(&sqd
->wait
, &wait
, TASK_INTERRUPTIBLE
);
6879 if (!test_bit(IO_SQ_THREAD_SHOULD_PARK
, &sqd
->state
)) {
6880 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
)
6881 io_ring_set_wakeup_flag(ctx
);
6884 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
) {
6885 if ((ctx
->flags
& IORING_SETUP_IOPOLL
) &&
6886 !list_empty_careful(&ctx
->iopoll_list
)) {
6887 needs_sched
= false;
6890 if (io_sqring_entries(ctx
)) {
6891 needs_sched
= false;
6897 mutex_unlock(&sqd
->lock
);
6899 mutex_lock(&sqd
->lock
);
6901 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
)
6902 io_ring_clear_wakeup_flag(ctx
);
6905 finish_wait(&sqd
->wait
, &wait
);
6906 io_run_task_work_head(&sqd
->park_task_work
);
6907 timeout
= jiffies
+ sqd
->sq_thread_idle
;
6910 io_uring_cancel_sqpoll(sqd
);
6912 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
)
6913 io_ring_set_wakeup_flag(ctx
);
6915 io_run_task_work_head(&sqd
->park_task_work
);
6916 mutex_unlock(&sqd
->lock
);
6918 complete(&sqd
->exited
);
6922 struct io_wait_queue
{
6923 struct wait_queue_entry wq
;
6924 struct io_ring_ctx
*ctx
;
6926 unsigned nr_timeouts
;
6929 static inline bool io_should_wake(struct io_wait_queue
*iowq
)
6931 struct io_ring_ctx
*ctx
= iowq
->ctx
;
6934 * Wake up if we have enough events, or if a timeout occurred since we
6935 * started waiting. For timeouts, we always want to return to userspace,
6936 * regardless of event count.
6938 return io_cqring_events(ctx
) >= iowq
->to_wait
||
6939 atomic_read(&ctx
->cq_timeouts
) != iowq
->nr_timeouts
;
6942 static int io_wake_function(struct wait_queue_entry
*curr
, unsigned int mode
,
6943 int wake_flags
, void *key
)
6945 struct io_wait_queue
*iowq
= container_of(curr
, struct io_wait_queue
,
6949 * Cannot safely flush overflowed CQEs from here, ensure we wake up
6950 * the task, and the next invocation will do it.
6952 if (io_should_wake(iowq
) || test_bit(0, &iowq
->ctx
->cq_check_overflow
))
6953 return autoremove_wake_function(curr
, mode
, wake_flags
, key
);
6957 static int io_run_task_work_sig(void)
6959 if (io_run_task_work())
6961 if (!signal_pending(current
))
6963 if (test_thread_flag(TIF_NOTIFY_SIGNAL
))
6964 return -ERESTARTSYS
;
6968 /* when returns >0, the caller should retry */
6969 static inline int io_cqring_wait_schedule(struct io_ring_ctx
*ctx
,
6970 struct io_wait_queue
*iowq
,
6971 signed long *timeout
)
6975 /* make sure we run task_work before checking for signals */
6976 ret
= io_run_task_work_sig();
6977 if (ret
|| io_should_wake(iowq
))
6979 /* let the caller flush overflows, retry */
6980 if (test_bit(0, &ctx
->cq_check_overflow
))
6983 *timeout
= schedule_timeout(*timeout
);
6984 return !*timeout
? -ETIME
: 1;
6988 * Wait until events become available, if we don't already have some. The
6989 * application must reap them itself, as they reside on the shared cq ring.
6991 static int io_cqring_wait(struct io_ring_ctx
*ctx
, int min_events
,
6992 const sigset_t __user
*sig
, size_t sigsz
,
6993 struct __kernel_timespec __user
*uts
)
6995 struct io_wait_queue iowq
= {
6998 .func
= io_wake_function
,
6999 .entry
= LIST_HEAD_INIT(iowq
.wq
.entry
),
7002 .to_wait
= min_events
,
7004 struct io_rings
*rings
= ctx
->rings
;
7005 signed long timeout
= MAX_SCHEDULE_TIMEOUT
;
7009 io_cqring_overflow_flush(ctx
, false);
7010 if (io_cqring_events(ctx
) >= min_events
)
7012 if (!io_run_task_work())
7017 #ifdef CONFIG_COMPAT
7018 if (in_compat_syscall())
7019 ret
= set_compat_user_sigmask((const compat_sigset_t __user
*)sig
,
7023 ret
= set_user_sigmask(sig
, sigsz
);
7030 struct timespec64 ts
;
7032 if (get_timespec64(&ts
, uts
))
7034 timeout
= timespec64_to_jiffies(&ts
);
7037 iowq
.nr_timeouts
= atomic_read(&ctx
->cq_timeouts
);
7038 trace_io_uring_cqring_wait(ctx
, min_events
);
7040 /* if we can't even flush overflow, don't wait for more */
7041 if (!io_cqring_overflow_flush(ctx
, false)) {
7045 prepare_to_wait_exclusive(&ctx
->wait
, &iowq
.wq
,
7046 TASK_INTERRUPTIBLE
);
7047 ret
= io_cqring_wait_schedule(ctx
, &iowq
, &timeout
);
7048 finish_wait(&ctx
->wait
, &iowq
.wq
);
7052 restore_saved_sigmask_unless(ret
== -EINTR
);
7054 return READ_ONCE(rings
->cq
.head
) == READ_ONCE(rings
->cq
.tail
) ? ret
: 0;
7057 static void io_free_file_tables(struct io_file_table
*table
, unsigned nr_files
)
7059 unsigned i
, nr_tables
= DIV_ROUND_UP(nr_files
, IORING_MAX_FILES_TABLE
);
7061 for (i
= 0; i
< nr_tables
; i
++)
7062 kfree(table
->files
[i
]);
7063 kfree(table
->files
);
7064 table
->files
= NULL
;
7067 static inline void io_rsrc_ref_lock(struct io_ring_ctx
*ctx
)
7069 spin_lock_bh(&ctx
->rsrc_ref_lock
);
7072 static inline void io_rsrc_ref_unlock(struct io_ring_ctx
*ctx
)
7074 spin_unlock_bh(&ctx
->rsrc_ref_lock
);
7077 static void io_rsrc_node_destroy(struct io_rsrc_node
*ref_node
)
7079 percpu_ref_exit(&ref_node
->refs
);
7083 static void io_rsrc_node_switch(struct io_ring_ctx
*ctx
,
7084 struct io_rsrc_data
*data_to_kill
)
7086 WARN_ON_ONCE(!ctx
->rsrc_backup_node
);
7087 WARN_ON_ONCE(data_to_kill
&& !ctx
->rsrc_node
);
7090 struct io_rsrc_node
*rsrc_node
= ctx
->rsrc_node
;
7092 rsrc_node
->rsrc_data
= data_to_kill
;
7093 io_rsrc_ref_lock(ctx
);
7094 list_add_tail(&rsrc_node
->node
, &ctx
->rsrc_ref_list
);
7095 io_rsrc_ref_unlock(ctx
);
7097 atomic_inc(&data_to_kill
->refs
);
7098 percpu_ref_kill(&rsrc_node
->refs
);
7099 ctx
->rsrc_node
= NULL
;
7102 if (!ctx
->rsrc_node
) {
7103 ctx
->rsrc_node
= ctx
->rsrc_backup_node
;
7104 ctx
->rsrc_backup_node
= NULL
;
7108 static int io_rsrc_node_switch_start(struct io_ring_ctx
*ctx
)
7110 if (ctx
->rsrc_backup_node
)
7112 ctx
->rsrc_backup_node
= io_rsrc_node_alloc(ctx
);
7113 return ctx
->rsrc_backup_node
? 0 : -ENOMEM
;
7116 static int io_rsrc_ref_quiesce(struct io_rsrc_data
*data
, struct io_ring_ctx
*ctx
)
7120 /* As we may drop ->uring_lock, other task may have started quiesce */
7124 data
->quiesce
= true;
7126 ret
= io_rsrc_node_switch_start(ctx
);
7129 io_rsrc_node_switch(ctx
, data
);
7131 /* kill initial ref, already quiesced if zero */
7132 if (atomic_dec_and_test(&data
->refs
))
7134 flush_delayed_work(&ctx
->rsrc_put_work
);
7135 ret
= wait_for_completion_interruptible(&data
->done
);
7139 atomic_inc(&data
->refs
);
7140 /* wait for all works potentially completing data->done */
7141 flush_delayed_work(&ctx
->rsrc_put_work
);
7142 reinit_completion(&data
->done
);
7144 mutex_unlock(&ctx
->uring_lock
);
7145 ret
= io_run_task_work_sig();
7146 mutex_lock(&ctx
->uring_lock
);
7148 data
->quiesce
= false;
7153 static void io_rsrc_data_free(struct io_rsrc_data
*data
)
7159 static struct io_rsrc_data
*io_rsrc_data_alloc(struct io_ring_ctx
*ctx
,
7160 rsrc_put_fn
*do_put
,
7163 struct io_rsrc_data
*data
;
7165 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
7169 data
->tags
= kvcalloc(nr
, sizeof(*data
->tags
), GFP_KERNEL
);
7175 atomic_set(&data
->refs
, 1);
7177 data
->do_put
= do_put
;
7178 init_completion(&data
->done
);
7182 static void __io_sqe_files_unregister(struct io_ring_ctx
*ctx
)
7184 #if defined(CONFIG_UNIX)
7185 if (ctx
->ring_sock
) {
7186 struct sock
*sock
= ctx
->ring_sock
->sk
;
7187 struct sk_buff
*skb
;
7189 while ((skb
= skb_dequeue(&sock
->sk_receive_queue
)) != NULL
)
7195 for (i
= 0; i
< ctx
->nr_user_files
; i
++) {
7198 file
= io_file_from_index(ctx
, i
);
7203 io_free_file_tables(&ctx
->file_table
, ctx
->nr_user_files
);
7204 io_rsrc_data_free(ctx
->file_data
);
7205 ctx
->file_data
= NULL
;
7206 ctx
->nr_user_files
= 0;
7209 static int io_sqe_files_unregister(struct io_ring_ctx
*ctx
)
7213 if (!ctx
->file_data
)
7215 ret
= io_rsrc_ref_quiesce(ctx
->file_data
, ctx
);
7217 __io_sqe_files_unregister(ctx
);
7221 static void io_sq_thread_unpark(struct io_sq_data
*sqd
)
7222 __releases(&sqd
->lock
)
7224 WARN_ON_ONCE(sqd
->thread
== current
);
7227 * Do the dance but not conditional clear_bit() because it'd race with
7228 * other threads incrementing park_pending and setting the bit.
7230 clear_bit(IO_SQ_THREAD_SHOULD_PARK
, &sqd
->state
);
7231 if (atomic_dec_return(&sqd
->park_pending
))
7232 set_bit(IO_SQ_THREAD_SHOULD_PARK
, &sqd
->state
);
7233 mutex_unlock(&sqd
->lock
);
7236 static void io_sq_thread_park(struct io_sq_data
*sqd
)
7237 __acquires(&sqd
->lock
)
7239 WARN_ON_ONCE(sqd
->thread
== current
);
7241 atomic_inc(&sqd
->park_pending
);
7242 set_bit(IO_SQ_THREAD_SHOULD_PARK
, &sqd
->state
);
7243 mutex_lock(&sqd
->lock
);
7245 wake_up_process(sqd
->thread
);
7248 static void io_sq_thread_stop(struct io_sq_data
*sqd
)
7250 WARN_ON_ONCE(sqd
->thread
== current
);
7251 WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP
, &sqd
->state
));
7253 set_bit(IO_SQ_THREAD_SHOULD_STOP
, &sqd
->state
);
7254 mutex_lock(&sqd
->lock
);
7256 wake_up_process(sqd
->thread
);
7257 mutex_unlock(&sqd
->lock
);
7258 wait_for_completion(&sqd
->exited
);
7261 static void io_put_sq_data(struct io_sq_data
*sqd
)
7263 if (refcount_dec_and_test(&sqd
->refs
)) {
7264 WARN_ON_ONCE(atomic_read(&sqd
->park_pending
));
7266 io_sq_thread_stop(sqd
);
7271 static void io_sq_thread_finish(struct io_ring_ctx
*ctx
)
7273 struct io_sq_data
*sqd
= ctx
->sq_data
;
7276 io_sq_thread_park(sqd
);
7277 list_del_init(&ctx
->sqd_list
);
7278 io_sqd_update_thread_idle(sqd
);
7279 io_sq_thread_unpark(sqd
);
7281 io_put_sq_data(sqd
);
7282 ctx
->sq_data
= NULL
;
7286 static struct io_sq_data
*io_attach_sq_data(struct io_uring_params
*p
)
7288 struct io_ring_ctx
*ctx_attach
;
7289 struct io_sq_data
*sqd
;
7292 f
= fdget(p
->wq_fd
);
7294 return ERR_PTR(-ENXIO
);
7295 if (f
.file
->f_op
!= &io_uring_fops
) {
7297 return ERR_PTR(-EINVAL
);
7300 ctx_attach
= f
.file
->private_data
;
7301 sqd
= ctx_attach
->sq_data
;
7304 return ERR_PTR(-EINVAL
);
7306 if (sqd
->task_tgid
!= current
->tgid
) {
7308 return ERR_PTR(-EPERM
);
7311 refcount_inc(&sqd
->refs
);
7316 static struct io_sq_data
*io_get_sq_data(struct io_uring_params
*p
,
7319 struct io_sq_data
*sqd
;
7322 if (p
->flags
& IORING_SETUP_ATTACH_WQ
) {
7323 sqd
= io_attach_sq_data(p
);
7328 /* fall through for EPERM case, setup new sqd/task */
7329 if (PTR_ERR(sqd
) != -EPERM
)
7333 sqd
= kzalloc(sizeof(*sqd
), GFP_KERNEL
);
7335 return ERR_PTR(-ENOMEM
);
7337 atomic_set(&sqd
->park_pending
, 0);
7338 refcount_set(&sqd
->refs
, 1);
7339 INIT_LIST_HEAD(&sqd
->ctx_list
);
7340 mutex_init(&sqd
->lock
);
7341 init_waitqueue_head(&sqd
->wait
);
7342 init_completion(&sqd
->exited
);
7346 #if defined(CONFIG_UNIX)
7348 * Ensure the UNIX gc is aware of our file set, so we are certain that
7349 * the io_uring can be safely unregistered on process exit, even if we have
7350 * loops in the file referencing.
7352 static int __io_sqe_files_scm(struct io_ring_ctx
*ctx
, int nr
, int offset
)
7354 struct sock
*sk
= ctx
->ring_sock
->sk
;
7355 struct scm_fp_list
*fpl
;
7356 struct sk_buff
*skb
;
7359 fpl
= kzalloc(sizeof(*fpl
), GFP_KERNEL
);
7363 skb
= alloc_skb(0, GFP_KERNEL
);
7372 fpl
->user
= get_uid(current_user());
7373 for (i
= 0; i
< nr
; i
++) {
7374 struct file
*file
= io_file_from_index(ctx
, i
+ offset
);
7378 fpl
->fp
[nr_files
] = get_file(file
);
7379 unix_inflight(fpl
->user
, fpl
->fp
[nr_files
]);
7384 fpl
->max
= SCM_MAX_FD
;
7385 fpl
->count
= nr_files
;
7386 UNIXCB(skb
).fp
= fpl
;
7387 skb
->destructor
= unix_destruct_scm
;
7388 refcount_add(skb
->truesize
, &sk
->sk_wmem_alloc
);
7389 skb_queue_head(&sk
->sk_receive_queue
, skb
);
7391 for (i
= 0; i
< nr_files
; i
++)
7402 * If UNIX sockets are enabled, fd passing can cause a reference cycle which
7403 * causes regular reference counting to break down. We rely on the UNIX
7404 * garbage collection to take care of this problem for us.
7406 static int io_sqe_files_scm(struct io_ring_ctx
*ctx
)
7408 unsigned left
, total
;
7412 left
= ctx
->nr_user_files
;
7414 unsigned this_files
= min_t(unsigned, left
, SCM_MAX_FD
);
7416 ret
= __io_sqe_files_scm(ctx
, this_files
, total
);
7420 total
+= this_files
;
7426 while (total
< ctx
->nr_user_files
) {
7427 struct file
*file
= io_file_from_index(ctx
, total
);
7437 static int io_sqe_files_scm(struct io_ring_ctx
*ctx
)
7443 static bool io_alloc_file_tables(struct io_file_table
*table
, unsigned nr_files
)
7445 unsigned i
, nr_tables
= DIV_ROUND_UP(nr_files
, IORING_MAX_FILES_TABLE
);
7447 table
->files
= kcalloc(nr_tables
, sizeof(*table
->files
), GFP_KERNEL
);
7451 for (i
= 0; i
< nr_tables
; i
++) {
7452 unsigned int this_files
= min(nr_files
, IORING_MAX_FILES_TABLE
);
7454 table
->files
[i
] = kcalloc(this_files
, sizeof(*table
->files
[i
]),
7456 if (!table
->files
[i
])
7458 nr_files
-= this_files
;
7464 io_free_file_tables(table
, nr_tables
* IORING_MAX_FILES_TABLE
);
7468 static void io_rsrc_file_put(struct io_ring_ctx
*ctx
, struct io_rsrc_put
*prsrc
)
7470 struct file
*file
= prsrc
->file
;
7471 #if defined(CONFIG_UNIX)
7472 struct sock
*sock
= ctx
->ring_sock
->sk
;
7473 struct sk_buff_head list
, *head
= &sock
->sk_receive_queue
;
7474 struct sk_buff
*skb
;
7477 __skb_queue_head_init(&list
);
7480 * Find the skb that holds this file in its SCM_RIGHTS. When found,
7481 * remove this entry and rearrange the file array.
7483 skb
= skb_dequeue(head
);
7485 struct scm_fp_list
*fp
;
7487 fp
= UNIXCB(skb
).fp
;
7488 for (i
= 0; i
< fp
->count
; i
++) {
7491 if (fp
->fp
[i
] != file
)
7494 unix_notinflight(fp
->user
, fp
->fp
[i
]);
7495 left
= fp
->count
- 1 - i
;
7497 memmove(&fp
->fp
[i
], &fp
->fp
[i
+ 1],
7498 left
* sizeof(struct file
*));
7505 __skb_queue_tail(&list
, skb
);
7515 __skb_queue_tail(&list
, skb
);
7517 skb
= skb_dequeue(head
);
7520 if (skb_peek(&list
)) {
7521 spin_lock_irq(&head
->lock
);
7522 while ((skb
= __skb_dequeue(&list
)) != NULL
)
7523 __skb_queue_tail(head
, skb
);
7524 spin_unlock_irq(&head
->lock
);
7531 static void __io_rsrc_put_work(struct io_rsrc_node
*ref_node
)
7533 struct io_rsrc_data
*rsrc_data
= ref_node
->rsrc_data
;
7534 struct io_ring_ctx
*ctx
= rsrc_data
->ctx
;
7535 struct io_rsrc_put
*prsrc
, *tmp
;
7537 list_for_each_entry_safe(prsrc
, tmp
, &ref_node
->rsrc_list
, list
) {
7538 list_del(&prsrc
->list
);
7541 bool lock_ring
= ctx
->flags
& IORING_SETUP_IOPOLL
;
7542 unsigned long flags
;
7544 io_ring_submit_lock(ctx
, lock_ring
);
7545 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
7546 io_cqring_fill_event(ctx
, prsrc
->tag
, 0, 0);
7548 io_commit_cqring(ctx
);
7549 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
7550 io_cqring_ev_posted(ctx
);
7551 io_ring_submit_unlock(ctx
, lock_ring
);
7554 rsrc_data
->do_put(ctx
, prsrc
);
7558 io_rsrc_node_destroy(ref_node
);
7559 if (atomic_dec_and_test(&rsrc_data
->refs
))
7560 complete(&rsrc_data
->done
);
7563 static void io_rsrc_put_work(struct work_struct
*work
)
7565 struct io_ring_ctx
*ctx
;
7566 struct llist_node
*node
;
7568 ctx
= container_of(work
, struct io_ring_ctx
, rsrc_put_work
.work
);
7569 node
= llist_del_all(&ctx
->rsrc_put_llist
);
7572 struct io_rsrc_node
*ref_node
;
7573 struct llist_node
*next
= node
->next
;
7575 ref_node
= llist_entry(node
, struct io_rsrc_node
, llist
);
7576 __io_rsrc_put_work(ref_node
);
7581 static void io_rsrc_node_ref_zero(struct percpu_ref
*ref
)
7583 struct io_rsrc_node
*node
= container_of(ref
, struct io_rsrc_node
, refs
);
7584 struct io_ring_ctx
*ctx
= node
->rsrc_data
->ctx
;
7585 bool first_add
= false;
7587 io_rsrc_ref_lock(ctx
);
7590 while (!list_empty(&ctx
->rsrc_ref_list
)) {
7591 node
= list_first_entry(&ctx
->rsrc_ref_list
,
7592 struct io_rsrc_node
, node
);
7593 /* recycle ref nodes in order */
7596 list_del(&node
->node
);
7597 first_add
|= llist_add(&node
->llist
, &ctx
->rsrc_put_llist
);
7599 io_rsrc_ref_unlock(ctx
);
7602 mod_delayed_work(system_wq
, &ctx
->rsrc_put_work
, HZ
);
7605 static struct io_rsrc_node
*io_rsrc_node_alloc(struct io_ring_ctx
*ctx
)
7607 struct io_rsrc_node
*ref_node
;
7609 ref_node
= kzalloc(sizeof(*ref_node
), GFP_KERNEL
);
7613 if (percpu_ref_init(&ref_node
->refs
, io_rsrc_node_ref_zero
,
7618 INIT_LIST_HEAD(&ref_node
->node
);
7619 INIT_LIST_HEAD(&ref_node
->rsrc_list
);
7620 ref_node
->done
= false;
7624 static int io_sqe_files_register(struct io_ring_ctx
*ctx
, void __user
*arg
,
7625 unsigned nr_args
, u64 __user
*tags
)
7627 __s32 __user
*fds
= (__s32 __user
*) arg
;
7631 struct io_rsrc_data
*file_data
;
7637 if (nr_args
> IORING_MAX_FIXED_FILES
)
7639 ret
= io_rsrc_node_switch_start(ctx
);
7643 file_data
= io_rsrc_data_alloc(ctx
, io_rsrc_file_put
, nr_args
);
7646 ctx
->file_data
= file_data
;
7648 if (!io_alloc_file_tables(&ctx
->file_table
, nr_args
))
7651 for (i
= 0; i
< nr_args
; i
++, ctx
->nr_user_files
++) {
7654 if ((tags
&& copy_from_user(&tag
, &tags
[i
], sizeof(tag
))) ||
7655 copy_from_user(&fd
, &fds
[i
], sizeof(fd
))) {
7659 /* allow sparse sets */
7669 if (unlikely(!file
))
7673 * Don't allow io_uring instances to be registered. If UNIX
7674 * isn't enabled, then this causes a reference cycle and this
7675 * instance can never get freed. If UNIX is enabled we'll
7676 * handle it just fine, but there's still no point in allowing
7677 * a ring fd as it doesn't support regular read/write anyway.
7679 if (file
->f_op
== &io_uring_fops
) {
7683 ctx
->file_data
->tags
[i
] = tag
;
7684 io_fixed_file_set(io_fixed_file_slot(&ctx
->file_table
, i
), file
);
7687 ret
= io_sqe_files_scm(ctx
);
7689 __io_sqe_files_unregister(ctx
);
7693 io_rsrc_node_switch(ctx
, NULL
);
7696 for (i
= 0; i
< ctx
->nr_user_files
; i
++) {
7697 file
= io_file_from_index(ctx
, i
);
7701 io_free_file_tables(&ctx
->file_table
, nr_args
);
7702 ctx
->nr_user_files
= 0;
7704 io_rsrc_data_free(ctx
->file_data
);
7705 ctx
->file_data
= NULL
;
7709 static int io_sqe_file_register(struct io_ring_ctx
*ctx
, struct file
*file
,
7712 #if defined(CONFIG_UNIX)
7713 struct sock
*sock
= ctx
->ring_sock
->sk
;
7714 struct sk_buff_head
*head
= &sock
->sk_receive_queue
;
7715 struct sk_buff
*skb
;
7718 * See if we can merge this file into an existing skb SCM_RIGHTS
7719 * file set. If there's no room, fall back to allocating a new skb
7720 * and filling it in.
7722 spin_lock_irq(&head
->lock
);
7723 skb
= skb_peek(head
);
7725 struct scm_fp_list
*fpl
= UNIXCB(skb
).fp
;
7727 if (fpl
->count
< SCM_MAX_FD
) {
7728 __skb_unlink(skb
, head
);
7729 spin_unlock_irq(&head
->lock
);
7730 fpl
->fp
[fpl
->count
] = get_file(file
);
7731 unix_inflight(fpl
->user
, fpl
->fp
[fpl
->count
]);
7733 spin_lock_irq(&head
->lock
);
7734 __skb_queue_head(head
, skb
);
7739 spin_unlock_irq(&head
->lock
);
7746 return __io_sqe_files_scm(ctx
, 1, index
);
7752 static int io_queue_rsrc_removal(struct io_rsrc_data
*data
, unsigned idx
,
7753 struct io_rsrc_node
*node
, void *rsrc
)
7755 struct io_rsrc_put
*prsrc
;
7757 prsrc
= kzalloc(sizeof(*prsrc
), GFP_KERNEL
);
7761 prsrc
->tag
= data
->tags
[idx
];
7763 list_add(&prsrc
->list
, &node
->rsrc_list
);
7767 static int __io_sqe_files_update(struct io_ring_ctx
*ctx
,
7768 struct io_uring_rsrc_update2
*up
,
7771 u64 __user
*tags
= u64_to_user_ptr(up
->tags
);
7772 __s32 __user
*fds
= u64_to_user_ptr(up
->data
);
7773 struct io_rsrc_data
*data
= ctx
->file_data
;
7774 struct io_fixed_file
*file_slot
;
7778 bool needs_switch
= false;
7780 if (!ctx
->file_data
)
7782 if (up
->offset
+ nr_args
> ctx
->nr_user_files
)
7785 for (done
= 0; done
< nr_args
; done
++) {
7788 if ((tags
&& copy_from_user(&tag
, &tags
[done
], sizeof(tag
))) ||
7789 copy_from_user(&fd
, &fds
[done
], sizeof(fd
))) {
7793 if ((fd
== IORING_REGISTER_FILES_SKIP
|| fd
== -1) && tag
) {
7797 if (fd
== IORING_REGISTER_FILES_SKIP
)
7800 i
= array_index_nospec(up
->offset
+ done
, ctx
->nr_user_files
);
7801 file_slot
= io_fixed_file_slot(&ctx
->file_table
, i
);
7803 if (file_slot
->file_ptr
) {
7804 file
= (struct file
*)(file_slot
->file_ptr
& FFS_MASK
);
7805 err
= io_queue_rsrc_removal(data
, up
->offset
+ done
,
7806 ctx
->rsrc_node
, file
);
7809 file_slot
->file_ptr
= 0;
7810 needs_switch
= true;
7819 * Don't allow io_uring instances to be registered. If
7820 * UNIX isn't enabled, then this causes a reference
7821 * cycle and this instance can never get freed. If UNIX
7822 * is enabled we'll handle it just fine, but there's
7823 * still no point in allowing a ring fd as it doesn't
7824 * support regular read/write anyway.
7826 if (file
->f_op
== &io_uring_fops
) {
7831 data
->tags
[up
->offset
+ done
] = tag
;
7832 io_fixed_file_set(file_slot
, file
);
7833 err
= io_sqe_file_register(ctx
, file
, i
);
7835 file_slot
->file_ptr
= 0;
7843 io_rsrc_node_switch(ctx
, data
);
7844 return done
? done
: err
;
7847 static struct io_wq_work
*io_free_work(struct io_wq_work
*work
)
7849 struct io_kiocb
*req
= container_of(work
, struct io_kiocb
, work
);
7851 req
= io_put_req_find_next(req
);
7852 return req
? &req
->work
: NULL
;
7855 static struct io_wq
*io_init_wq_offload(struct io_ring_ctx
*ctx
,
7856 struct task_struct
*task
)
7858 struct io_wq_hash
*hash
;
7859 struct io_wq_data data
;
7860 unsigned int concurrency
;
7862 hash
= ctx
->hash_map
;
7864 hash
= kzalloc(sizeof(*hash
), GFP_KERNEL
);
7866 return ERR_PTR(-ENOMEM
);
7867 refcount_set(&hash
->refs
, 1);
7868 init_waitqueue_head(&hash
->wait
);
7869 ctx
->hash_map
= hash
;
7874 data
.free_work
= io_free_work
;
7875 data
.do_work
= io_wq_submit_work
;
7877 /* Do QD, or 4 * CPUS, whatever is smallest */
7878 concurrency
= min(ctx
->sq_entries
, 4 * num_online_cpus());
7880 return io_wq_create(concurrency
, &data
);
7883 static int io_uring_alloc_task_context(struct task_struct
*task
,
7884 struct io_ring_ctx
*ctx
)
7886 struct io_uring_task
*tctx
;
7889 tctx
= kmalloc(sizeof(*tctx
), GFP_KERNEL
);
7890 if (unlikely(!tctx
))
7893 ret
= percpu_counter_init(&tctx
->inflight
, 0, GFP_KERNEL
);
7894 if (unlikely(ret
)) {
7899 tctx
->io_wq
= io_init_wq_offload(ctx
, task
);
7900 if (IS_ERR(tctx
->io_wq
)) {
7901 ret
= PTR_ERR(tctx
->io_wq
);
7902 percpu_counter_destroy(&tctx
->inflight
);
7908 init_waitqueue_head(&tctx
->wait
);
7910 atomic_set(&tctx
->in_idle
, 0);
7911 atomic_set(&tctx
->inflight_tracked
, 0);
7912 task
->io_uring
= tctx
;
7913 spin_lock_init(&tctx
->task_lock
);
7914 INIT_WQ_LIST(&tctx
->task_list
);
7915 tctx
->task_state
= 0;
7916 init_task_work(&tctx
->task_work
, tctx_task_work
);
7920 void __io_uring_free(struct task_struct
*tsk
)
7922 struct io_uring_task
*tctx
= tsk
->io_uring
;
7924 WARN_ON_ONCE(!xa_empty(&tctx
->xa
));
7925 WARN_ON_ONCE(tctx
->io_wq
);
7927 percpu_counter_destroy(&tctx
->inflight
);
7929 tsk
->io_uring
= NULL
;
7932 static int io_sq_offload_create(struct io_ring_ctx
*ctx
,
7933 struct io_uring_params
*p
)
7937 /* Retain compatibility with failing for an invalid attach attempt */
7938 if ((ctx
->flags
& (IORING_SETUP_ATTACH_WQ
| IORING_SETUP_SQPOLL
)) ==
7939 IORING_SETUP_ATTACH_WQ
) {
7942 f
= fdget(p
->wq_fd
);
7946 if (f
.file
->f_op
!= &io_uring_fops
)
7949 if (ctx
->flags
& IORING_SETUP_SQPOLL
) {
7950 struct task_struct
*tsk
;
7951 struct io_sq_data
*sqd
;
7954 sqd
= io_get_sq_data(p
, &attached
);
7960 ctx
->sq_creds
= get_current_cred();
7962 ctx
->sq_thread_idle
= msecs_to_jiffies(p
->sq_thread_idle
);
7963 if (!ctx
->sq_thread_idle
)
7964 ctx
->sq_thread_idle
= HZ
;
7966 io_sq_thread_park(sqd
);
7967 list_add(&ctx
->sqd_list
, &sqd
->ctx_list
);
7968 io_sqd_update_thread_idle(sqd
);
7969 /* don't attach to a dying SQPOLL thread, would be racy */
7970 ret
= (attached
&& !sqd
->thread
) ? -ENXIO
: 0;
7971 io_sq_thread_unpark(sqd
);
7978 if (p
->flags
& IORING_SETUP_SQ_AFF
) {
7979 int cpu
= p
->sq_thread_cpu
;
7982 if (cpu
>= nr_cpu_ids
|| !cpu_online(cpu
))
7989 sqd
->task_pid
= current
->pid
;
7990 sqd
->task_tgid
= current
->tgid
;
7991 tsk
= create_io_thread(io_sq_thread
, sqd
, NUMA_NO_NODE
);
7998 ret
= io_uring_alloc_task_context(tsk
, ctx
);
7999 wake_up_new_task(tsk
);
8002 } else if (p
->flags
& IORING_SETUP_SQ_AFF
) {
8003 /* Can't have SQ_AFF without SQPOLL */
8010 complete(&ctx
->sq_data
->exited
);
8012 io_sq_thread_finish(ctx
);
8016 static inline void __io_unaccount_mem(struct user_struct
*user
,
8017 unsigned long nr_pages
)
8019 atomic_long_sub(nr_pages
, &user
->locked_vm
);
8022 static inline int __io_account_mem(struct user_struct
*user
,
8023 unsigned long nr_pages
)
8025 unsigned long page_limit
, cur_pages
, new_pages
;
8027 /* Don't allow more pages than we can safely lock */
8028 page_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
8031 cur_pages
= atomic_long_read(&user
->locked_vm
);
8032 new_pages
= cur_pages
+ nr_pages
;
8033 if (new_pages
> page_limit
)
8035 } while (atomic_long_cmpxchg(&user
->locked_vm
, cur_pages
,
8036 new_pages
) != cur_pages
);
8041 static void io_unaccount_mem(struct io_ring_ctx
*ctx
, unsigned long nr_pages
)
8044 __io_unaccount_mem(ctx
->user
, nr_pages
);
8046 if (ctx
->mm_account
)
8047 atomic64_sub(nr_pages
, &ctx
->mm_account
->pinned_vm
);
8050 static int io_account_mem(struct io_ring_ctx
*ctx
, unsigned long nr_pages
)
8055 ret
= __io_account_mem(ctx
->user
, nr_pages
);
8060 if (ctx
->mm_account
)
8061 atomic64_add(nr_pages
, &ctx
->mm_account
->pinned_vm
);
8066 static void io_mem_free(void *ptr
)
8073 page
= virt_to_head_page(ptr
);
8074 if (put_page_testzero(page
))
8075 free_compound_page(page
);
8078 static void *io_mem_alloc(size_t size
)
8080 gfp_t gfp_flags
= GFP_KERNEL
| __GFP_ZERO
| __GFP_NOWARN
| __GFP_COMP
|
8081 __GFP_NORETRY
| __GFP_ACCOUNT
;
8083 return (void *) __get_free_pages(gfp_flags
, get_order(size
));
8086 static unsigned long rings_size(unsigned sq_entries
, unsigned cq_entries
,
8089 struct io_rings
*rings
;
8090 size_t off
, sq_array_size
;
8092 off
= struct_size(rings
, cqes
, cq_entries
);
8093 if (off
== SIZE_MAX
)
8097 off
= ALIGN(off
, SMP_CACHE_BYTES
);
8105 sq_array_size
= array_size(sizeof(u32
), sq_entries
);
8106 if (sq_array_size
== SIZE_MAX
)
8109 if (check_add_overflow(off
, sq_array_size
, &off
))
8115 static void io_buffer_unmap(struct io_ring_ctx
*ctx
, struct io_mapped_ubuf
**slot
)
8117 struct io_mapped_ubuf
*imu
= *slot
;
8120 if (imu
!= ctx
->dummy_ubuf
) {
8121 for (i
= 0; i
< imu
->nr_bvecs
; i
++)
8122 unpin_user_page(imu
->bvec
[i
].bv_page
);
8123 if (imu
->acct_pages
)
8124 io_unaccount_mem(ctx
, imu
->acct_pages
);
8130 static void io_rsrc_buf_put(struct io_ring_ctx
*ctx
, struct io_rsrc_put
*prsrc
)
8132 io_buffer_unmap(ctx
, &prsrc
->buf
);
8136 static void __io_sqe_buffers_unregister(struct io_ring_ctx
*ctx
)
8140 for (i
= 0; i
< ctx
->nr_user_bufs
; i
++)
8141 io_buffer_unmap(ctx
, &ctx
->user_bufs
[i
]);
8142 kfree(ctx
->user_bufs
);
8143 io_rsrc_data_free(ctx
->buf_data
);
8144 ctx
->user_bufs
= NULL
;
8145 ctx
->buf_data
= NULL
;
8146 ctx
->nr_user_bufs
= 0;
8149 static int io_sqe_buffers_unregister(struct io_ring_ctx
*ctx
)
8156 ret
= io_rsrc_ref_quiesce(ctx
->buf_data
, ctx
);
8158 __io_sqe_buffers_unregister(ctx
);
8162 static int io_copy_iov(struct io_ring_ctx
*ctx
, struct iovec
*dst
,
8163 void __user
*arg
, unsigned index
)
8165 struct iovec __user
*src
;
8167 #ifdef CONFIG_COMPAT
8169 struct compat_iovec __user
*ciovs
;
8170 struct compat_iovec ciov
;
8172 ciovs
= (struct compat_iovec __user
*) arg
;
8173 if (copy_from_user(&ciov
, &ciovs
[index
], sizeof(ciov
)))
8176 dst
->iov_base
= u64_to_user_ptr((u64
)ciov
.iov_base
);
8177 dst
->iov_len
= ciov
.iov_len
;
8181 src
= (struct iovec __user
*) arg
;
8182 if (copy_from_user(dst
, &src
[index
], sizeof(*dst
)))
8188 * Not super efficient, but this is just a registration time. And we do cache
8189 * the last compound head, so generally we'll only do a full search if we don't
8192 * We check if the given compound head page has already been accounted, to
8193 * avoid double accounting it. This allows us to account the full size of the
8194 * page, not just the constituent pages of a huge page.
8196 static bool headpage_already_acct(struct io_ring_ctx
*ctx
, struct page
**pages
,
8197 int nr_pages
, struct page
*hpage
)
8201 /* check current page array */
8202 for (i
= 0; i
< nr_pages
; i
++) {
8203 if (!PageCompound(pages
[i
]))
8205 if (compound_head(pages
[i
]) == hpage
)
8209 /* check previously registered pages */
8210 for (i
= 0; i
< ctx
->nr_user_bufs
; i
++) {
8211 struct io_mapped_ubuf
*imu
= ctx
->user_bufs
[i
];
8213 for (j
= 0; j
< imu
->nr_bvecs
; j
++) {
8214 if (!PageCompound(imu
->bvec
[j
].bv_page
))
8216 if (compound_head(imu
->bvec
[j
].bv_page
) == hpage
)
8224 static int io_buffer_account_pin(struct io_ring_ctx
*ctx
, struct page
**pages
,
8225 int nr_pages
, struct io_mapped_ubuf
*imu
,
8226 struct page
**last_hpage
)
8230 for (i
= 0; i
< nr_pages
; i
++) {
8231 if (!PageCompound(pages
[i
])) {
8236 hpage
= compound_head(pages
[i
]);
8237 if (hpage
== *last_hpage
)
8239 *last_hpage
= hpage
;
8240 if (headpage_already_acct(ctx
, pages
, i
, hpage
))
8242 imu
->acct_pages
+= page_size(hpage
) >> PAGE_SHIFT
;
8246 if (!imu
->acct_pages
)
8249 ret
= io_account_mem(ctx
, imu
->acct_pages
);
8251 imu
->acct_pages
= 0;
8255 static int io_sqe_buffer_register(struct io_ring_ctx
*ctx
, struct iovec
*iov
,
8256 struct io_mapped_ubuf
**pimu
,
8257 struct page
**last_hpage
)
8259 struct io_mapped_ubuf
*imu
= NULL
;
8260 struct vm_area_struct
**vmas
= NULL
;
8261 struct page
**pages
= NULL
;
8262 unsigned long off
, start
, end
, ubuf
;
8264 int ret
, pret
, nr_pages
, i
;
8266 if (!iov
->iov_base
) {
8267 *pimu
= ctx
->dummy_ubuf
;
8271 ubuf
= (unsigned long) iov
->iov_base
;
8272 end
= (ubuf
+ iov
->iov_len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
8273 start
= ubuf
>> PAGE_SHIFT
;
8274 nr_pages
= end
- start
;
8279 pages
= kvmalloc_array(nr_pages
, sizeof(struct page
*), GFP_KERNEL
);
8283 vmas
= kvmalloc_array(nr_pages
, sizeof(struct vm_area_struct
*),
8288 imu
= kvmalloc(struct_size(imu
, bvec
, nr_pages
), GFP_KERNEL
);
8293 mmap_read_lock(current
->mm
);
8294 pret
= pin_user_pages(ubuf
, nr_pages
, FOLL_WRITE
| FOLL_LONGTERM
,
8296 if (pret
== nr_pages
) {
8297 /* don't support file backed memory */
8298 for (i
= 0; i
< nr_pages
; i
++) {
8299 struct vm_area_struct
*vma
= vmas
[i
];
8302 !is_file_hugepages(vma
->vm_file
)) {
8308 ret
= pret
< 0 ? pret
: -EFAULT
;
8310 mmap_read_unlock(current
->mm
);
8313 * if we did partial map, or found file backed vmas,
8314 * release any pages we did get
8317 unpin_user_pages(pages
, pret
);
8321 ret
= io_buffer_account_pin(ctx
, pages
, pret
, imu
, last_hpage
);
8323 unpin_user_pages(pages
, pret
);
8327 off
= ubuf
& ~PAGE_MASK
;
8328 size
= iov
->iov_len
;
8329 for (i
= 0; i
< nr_pages
; i
++) {
8332 vec_len
= min_t(size_t, size
, PAGE_SIZE
- off
);
8333 imu
->bvec
[i
].bv_page
= pages
[i
];
8334 imu
->bvec
[i
].bv_len
= vec_len
;
8335 imu
->bvec
[i
].bv_offset
= off
;
8339 /* store original address for later verification */
8341 imu
->ubuf_end
= ubuf
+ iov
->iov_len
;
8342 imu
->nr_bvecs
= nr_pages
;
8353 static int io_buffers_map_alloc(struct io_ring_ctx
*ctx
, unsigned int nr_args
)
8355 ctx
->user_bufs
= kcalloc(nr_args
, sizeof(*ctx
->user_bufs
), GFP_KERNEL
);
8356 return ctx
->user_bufs
? 0 : -ENOMEM
;
8359 static int io_buffer_validate(struct iovec
*iov
)
8361 unsigned long tmp
, acct_len
= iov
->iov_len
+ (PAGE_SIZE
- 1);
8364 * Don't impose further limits on the size and buffer
8365 * constraints here, we'll -EINVAL later when IO is
8366 * submitted if they are wrong.
8369 return iov
->iov_len
? -EFAULT
: 0;
8373 /* arbitrary limit, but we need something */
8374 if (iov
->iov_len
> SZ_1G
)
8377 if (check_add_overflow((unsigned long)iov
->iov_base
, acct_len
, &tmp
))
8383 static int io_sqe_buffers_register(struct io_ring_ctx
*ctx
, void __user
*arg
,
8384 unsigned int nr_args
, u64 __user
*tags
)
8386 struct page
*last_hpage
= NULL
;
8387 struct io_rsrc_data
*data
;
8393 if (!nr_args
|| nr_args
> UIO_MAXIOV
)
8395 ret
= io_rsrc_node_switch_start(ctx
);
8398 data
= io_rsrc_data_alloc(ctx
, io_rsrc_buf_put
, nr_args
);
8401 ret
= io_buffers_map_alloc(ctx
, nr_args
);
8403 io_rsrc_data_free(data
);
8407 for (i
= 0; i
< nr_args
; i
++, ctx
->nr_user_bufs
++) {
8410 if (tags
&& copy_from_user(&tag
, &tags
[i
], sizeof(tag
))) {
8414 ret
= io_copy_iov(ctx
, &iov
, arg
, i
);
8417 ret
= io_buffer_validate(&iov
);
8420 if (!iov
.iov_base
&& tag
) {
8425 ret
= io_sqe_buffer_register(ctx
, &iov
, &ctx
->user_bufs
[i
],
8429 data
->tags
[i
] = tag
;
8432 WARN_ON_ONCE(ctx
->buf_data
);
8434 ctx
->buf_data
= data
;
8436 __io_sqe_buffers_unregister(ctx
);
8438 io_rsrc_node_switch(ctx
, NULL
);
8442 static int __io_sqe_buffers_update(struct io_ring_ctx
*ctx
,
8443 struct io_uring_rsrc_update2
*up
,
8444 unsigned int nr_args
)
8446 u64 __user
*tags
= u64_to_user_ptr(up
->tags
);
8447 struct iovec iov
, __user
*iovs
= u64_to_user_ptr(up
->data
);
8448 struct page
*last_hpage
= NULL
;
8449 bool needs_switch
= false;
8455 if (up
->offset
+ nr_args
> ctx
->nr_user_bufs
)
8458 for (done
= 0; done
< nr_args
; done
++) {
8459 struct io_mapped_ubuf
*imu
;
8460 int offset
= up
->offset
+ done
;
8463 err
= io_copy_iov(ctx
, &iov
, iovs
, done
);
8466 if (tags
&& copy_from_user(&tag
, &tags
[done
], sizeof(tag
))) {
8470 err
= io_buffer_validate(&iov
);
8473 if (!iov
.iov_base
&& tag
) {
8477 err
= io_sqe_buffer_register(ctx
, &iov
, &imu
, &last_hpage
);
8481 i
= array_index_nospec(offset
, ctx
->nr_user_bufs
);
8482 if (ctx
->user_bufs
[i
] != ctx
->dummy_ubuf
) {
8483 err
= io_queue_rsrc_removal(ctx
->buf_data
, offset
,
8484 ctx
->rsrc_node
, ctx
->user_bufs
[i
]);
8485 if (unlikely(err
)) {
8486 io_buffer_unmap(ctx
, &imu
);
8489 ctx
->user_bufs
[i
] = NULL
;
8490 needs_switch
= true;
8493 ctx
->user_bufs
[i
] = imu
;
8494 ctx
->buf_data
->tags
[offset
] = tag
;
8498 io_rsrc_node_switch(ctx
, ctx
->buf_data
);
8499 return done
? done
: err
;
8502 static int io_eventfd_register(struct io_ring_ctx
*ctx
, void __user
*arg
)
8504 __s32 __user
*fds
= arg
;
8510 if (copy_from_user(&fd
, fds
, sizeof(*fds
)))
8513 ctx
->cq_ev_fd
= eventfd_ctx_fdget(fd
);
8514 if (IS_ERR(ctx
->cq_ev_fd
)) {
8515 int ret
= PTR_ERR(ctx
->cq_ev_fd
);
8516 ctx
->cq_ev_fd
= NULL
;
8523 static int io_eventfd_unregister(struct io_ring_ctx
*ctx
)
8525 if (ctx
->cq_ev_fd
) {
8526 eventfd_ctx_put(ctx
->cq_ev_fd
);
8527 ctx
->cq_ev_fd
= NULL
;
8534 static void io_destroy_buffers(struct io_ring_ctx
*ctx
)
8536 struct io_buffer
*buf
;
8537 unsigned long index
;
8539 xa_for_each(&ctx
->io_buffers
, index
, buf
)
8540 __io_remove_buffers(ctx
, buf
, index
, -1U);
8543 static void io_req_cache_free(struct list_head
*list
, struct task_struct
*tsk
)
8545 struct io_kiocb
*req
, *nxt
;
8547 list_for_each_entry_safe(req
, nxt
, list
, compl.list
) {
8548 if (tsk
&& req
->task
!= tsk
)
8550 list_del(&req
->compl.list
);
8551 kmem_cache_free(req_cachep
, req
);
8555 static void io_req_caches_free(struct io_ring_ctx
*ctx
)
8557 struct io_submit_state
*submit_state
= &ctx
->submit_state
;
8558 struct io_comp_state
*cs
= &ctx
->submit_state
.comp
;
8560 mutex_lock(&ctx
->uring_lock
);
8562 if (submit_state
->free_reqs
) {
8563 kmem_cache_free_bulk(req_cachep
, submit_state
->free_reqs
,
8564 submit_state
->reqs
);
8565 submit_state
->free_reqs
= 0;
8568 io_flush_cached_locked_reqs(ctx
, cs
);
8569 io_req_cache_free(&cs
->free_list
, NULL
);
8570 mutex_unlock(&ctx
->uring_lock
);
8573 static bool io_wait_rsrc_data(struct io_rsrc_data
*data
)
8577 if (!atomic_dec_and_test(&data
->refs
))
8578 wait_for_completion(&data
->done
);
8582 static void io_ring_ctx_free(struct io_ring_ctx
*ctx
)
8584 io_sq_thread_finish(ctx
);
8586 if (ctx
->mm_account
) {
8587 mmdrop(ctx
->mm_account
);
8588 ctx
->mm_account
= NULL
;
8591 mutex_lock(&ctx
->uring_lock
);
8592 if (io_wait_rsrc_data(ctx
->buf_data
))
8593 __io_sqe_buffers_unregister(ctx
);
8594 if (io_wait_rsrc_data(ctx
->file_data
))
8595 __io_sqe_files_unregister(ctx
);
8597 __io_cqring_overflow_flush(ctx
, true);
8598 mutex_unlock(&ctx
->uring_lock
);
8599 io_eventfd_unregister(ctx
);
8600 io_destroy_buffers(ctx
);
8602 put_cred(ctx
->sq_creds
);
8604 /* there are no registered resources left, nobody uses it */
8606 io_rsrc_node_destroy(ctx
->rsrc_node
);
8607 if (ctx
->rsrc_backup_node
)
8608 io_rsrc_node_destroy(ctx
->rsrc_backup_node
);
8609 flush_delayed_work(&ctx
->rsrc_put_work
);
8611 WARN_ON_ONCE(!list_empty(&ctx
->rsrc_ref_list
));
8612 WARN_ON_ONCE(!llist_empty(&ctx
->rsrc_put_llist
));
8614 #if defined(CONFIG_UNIX)
8615 if (ctx
->ring_sock
) {
8616 ctx
->ring_sock
->file
= NULL
; /* so that iput() is called */
8617 sock_release(ctx
->ring_sock
);
8621 io_mem_free(ctx
->rings
);
8622 io_mem_free(ctx
->sq_sqes
);
8624 percpu_ref_exit(&ctx
->refs
);
8625 free_uid(ctx
->user
);
8626 io_req_caches_free(ctx
);
8628 io_wq_put_hash(ctx
->hash_map
);
8629 kfree(ctx
->cancel_hash
);
8630 kfree(ctx
->dummy_ubuf
);
8634 static __poll_t
io_uring_poll(struct file
*file
, poll_table
*wait
)
8636 struct io_ring_ctx
*ctx
= file
->private_data
;
8639 poll_wait(file
, &ctx
->cq_wait
, wait
);
8641 * synchronizes with barrier from wq_has_sleeper call in
8645 if (!io_sqring_full(ctx
))
8646 mask
|= EPOLLOUT
| EPOLLWRNORM
;
8649 * Don't flush cqring overflow list here, just do a simple check.
8650 * Otherwise there could possible be ABBA deadlock:
8653 * lock(&ctx->uring_lock);
8655 * lock(&ctx->uring_lock);
8658 * Users may get EPOLLIN meanwhile seeing nothing in cqring, this
8659 * pushs them to do the flush.
8661 if (io_cqring_events(ctx
) || test_bit(0, &ctx
->cq_check_overflow
))
8662 mask
|= EPOLLIN
| EPOLLRDNORM
;
8667 static int io_uring_fasync(int fd
, struct file
*file
, int on
)
8669 struct io_ring_ctx
*ctx
= file
->private_data
;
8671 return fasync_helper(fd
, file
, on
, &ctx
->cq_fasync
);
8674 static int io_unregister_personality(struct io_ring_ctx
*ctx
, unsigned id
)
8676 const struct cred
*creds
;
8678 creds
= xa_erase(&ctx
->personalities
, id
);
8687 static inline bool io_run_ctx_fallback(struct io_ring_ctx
*ctx
)
8689 return io_run_task_work_head(&ctx
->exit_task_work
);
8692 struct io_tctx_exit
{
8693 struct callback_head task_work
;
8694 struct completion completion
;
8695 struct io_ring_ctx
*ctx
;
8698 static void io_tctx_exit_cb(struct callback_head
*cb
)
8700 struct io_uring_task
*tctx
= current
->io_uring
;
8701 struct io_tctx_exit
*work
;
8703 work
= container_of(cb
, struct io_tctx_exit
, task_work
);
8705 * When @in_idle, we're in cancellation and it's racy to remove the
8706 * node. It'll be removed by the end of cancellation, just ignore it.
8708 if (!atomic_read(&tctx
->in_idle
))
8709 io_uring_del_task_file((unsigned long)work
->ctx
);
8710 complete(&work
->completion
);
8713 static bool io_cancel_ctx_cb(struct io_wq_work
*work
, void *data
)
8715 struct io_kiocb
*req
= container_of(work
, struct io_kiocb
, work
);
8717 return req
->ctx
== data
;
8720 static void io_ring_exit_work(struct work_struct
*work
)
8722 struct io_ring_ctx
*ctx
= container_of(work
, struct io_ring_ctx
, exit_work
);
8723 unsigned long timeout
= jiffies
+ HZ
* 60 * 5;
8724 struct io_tctx_exit exit
;
8725 struct io_tctx_node
*node
;
8729 * If we're doing polled IO and end up having requests being
8730 * submitted async (out-of-line), then completions can come in while
8731 * we're waiting for refs to drop. We need to reap these manually,
8732 * as nobody else will be looking for them.
8735 io_uring_try_cancel_requests(ctx
, NULL
, NULL
);
8737 struct io_sq_data
*sqd
= ctx
->sq_data
;
8738 struct task_struct
*tsk
;
8740 io_sq_thread_park(sqd
);
8742 if (tsk
&& tsk
->io_uring
&& tsk
->io_uring
->io_wq
)
8743 io_wq_cancel_cb(tsk
->io_uring
->io_wq
,
8744 io_cancel_ctx_cb
, ctx
, true);
8745 io_sq_thread_unpark(sqd
);
8748 WARN_ON_ONCE(time_after(jiffies
, timeout
));
8749 } while (!wait_for_completion_timeout(&ctx
->ref_comp
, HZ
/20));
8751 init_completion(&exit
.completion
);
8752 init_task_work(&exit
.task_work
, io_tctx_exit_cb
);
8755 * Some may use context even when all refs and requests have been put,
8756 * and they are free to do so while still holding uring_lock or
8757 * completion_lock, see __io_req_task_submit(). Apart from other work,
8758 * this lock/unlock section also waits them to finish.
8760 mutex_lock(&ctx
->uring_lock
);
8761 while (!list_empty(&ctx
->tctx_list
)) {
8762 WARN_ON_ONCE(time_after(jiffies
, timeout
));
8764 node
= list_first_entry(&ctx
->tctx_list
, struct io_tctx_node
,
8766 /* don't spin on a single task if cancellation failed */
8767 list_rotate_left(&ctx
->tctx_list
);
8768 ret
= task_work_add(node
->task
, &exit
.task_work
, TWA_SIGNAL
);
8769 if (WARN_ON_ONCE(ret
))
8771 wake_up_process(node
->task
);
8773 mutex_unlock(&ctx
->uring_lock
);
8774 wait_for_completion(&exit
.completion
);
8775 mutex_lock(&ctx
->uring_lock
);
8777 mutex_unlock(&ctx
->uring_lock
);
8778 spin_lock_irq(&ctx
->completion_lock
);
8779 spin_unlock_irq(&ctx
->completion_lock
);
8781 io_ring_ctx_free(ctx
);
8784 /* Returns true if we found and killed one or more timeouts */
8785 static bool io_kill_timeouts(struct io_ring_ctx
*ctx
, struct task_struct
*tsk
,
8786 struct files_struct
*files
)
8788 struct io_kiocb
*req
, *tmp
;
8791 spin_lock_irq(&ctx
->completion_lock
);
8792 list_for_each_entry_safe(req
, tmp
, &ctx
->timeout_list
, timeout
.list
) {
8793 if (io_match_task(req
, tsk
, files
)) {
8794 io_kill_timeout(req
, -ECANCELED
);
8799 io_commit_cqring(ctx
);
8800 spin_unlock_irq(&ctx
->completion_lock
);
8802 io_cqring_ev_posted(ctx
);
8803 return canceled
!= 0;
8806 static void io_ring_ctx_wait_and_kill(struct io_ring_ctx
*ctx
)
8808 unsigned long index
;
8809 struct creds
*creds
;
8811 mutex_lock(&ctx
->uring_lock
);
8812 percpu_ref_kill(&ctx
->refs
);
8814 __io_cqring_overflow_flush(ctx
, true);
8815 xa_for_each(&ctx
->personalities
, index
, creds
)
8816 io_unregister_personality(ctx
, index
);
8817 mutex_unlock(&ctx
->uring_lock
);
8819 io_kill_timeouts(ctx
, NULL
, NULL
);
8820 io_poll_remove_all(ctx
, NULL
, NULL
);
8822 /* if we failed setting up the ctx, we might not have any rings */
8823 io_iopoll_try_reap_events(ctx
);
8825 INIT_WORK(&ctx
->exit_work
, io_ring_exit_work
);
8827 * Use system_unbound_wq to avoid spawning tons of event kworkers
8828 * if we're exiting a ton of rings at the same time. It just adds
8829 * noise and overhead, there's no discernable change in runtime
8830 * over using system_wq.
8832 queue_work(system_unbound_wq
, &ctx
->exit_work
);
8835 static int io_uring_release(struct inode
*inode
, struct file
*file
)
8837 struct io_ring_ctx
*ctx
= file
->private_data
;
8839 file
->private_data
= NULL
;
8840 io_ring_ctx_wait_and_kill(ctx
);
8844 struct io_task_cancel
{
8845 struct task_struct
*task
;
8846 struct files_struct
*files
;
8849 static bool io_cancel_task_cb(struct io_wq_work
*work
, void *data
)
8851 struct io_kiocb
*req
= container_of(work
, struct io_kiocb
, work
);
8852 struct io_task_cancel
*cancel
= data
;
8855 if (cancel
->files
&& (req
->flags
& REQ_F_LINK_TIMEOUT
)) {
8856 unsigned long flags
;
8857 struct io_ring_ctx
*ctx
= req
->ctx
;
8859 /* protect against races with linked timeouts */
8860 spin_lock_irqsave(&ctx
->completion_lock
, flags
);
8861 ret
= io_match_task(req
, cancel
->task
, cancel
->files
);
8862 spin_unlock_irqrestore(&ctx
->completion_lock
, flags
);
8864 ret
= io_match_task(req
, cancel
->task
, cancel
->files
);
8869 static bool io_cancel_defer_files(struct io_ring_ctx
*ctx
,
8870 struct task_struct
*task
,
8871 struct files_struct
*files
)
8873 struct io_defer_entry
*de
;
8876 spin_lock_irq(&ctx
->completion_lock
);
8877 list_for_each_entry_reverse(de
, &ctx
->defer_list
, list
) {
8878 if (io_match_task(de
->req
, task
, files
)) {
8879 list_cut_position(&list
, &ctx
->defer_list
, &de
->list
);
8883 spin_unlock_irq(&ctx
->completion_lock
);
8884 if (list_empty(&list
))
8887 while (!list_empty(&list
)) {
8888 de
= list_first_entry(&list
, struct io_defer_entry
, list
);
8889 list_del_init(&de
->list
);
8890 io_req_complete_failed(de
->req
, -ECANCELED
);
8896 static bool io_uring_try_cancel_iowq(struct io_ring_ctx
*ctx
)
8898 struct io_tctx_node
*node
;
8899 enum io_wq_cancel cret
;
8902 mutex_lock(&ctx
->uring_lock
);
8903 list_for_each_entry(node
, &ctx
->tctx_list
, ctx_node
) {
8904 struct io_uring_task
*tctx
= node
->task
->io_uring
;
8907 * io_wq will stay alive while we hold uring_lock, because it's
8908 * killed after ctx nodes, which requires to take the lock.
8910 if (!tctx
|| !tctx
->io_wq
)
8912 cret
= io_wq_cancel_cb(tctx
->io_wq
, io_cancel_ctx_cb
, ctx
, true);
8913 ret
|= (cret
!= IO_WQ_CANCEL_NOTFOUND
);
8915 mutex_unlock(&ctx
->uring_lock
);
8920 static void io_uring_try_cancel_requests(struct io_ring_ctx
*ctx
,
8921 struct task_struct
*task
,
8922 struct files_struct
*files
)
8924 struct io_task_cancel cancel
= { .task
= task
, .files
= files
, };
8925 struct io_uring_task
*tctx
= task
? task
->io_uring
: NULL
;
8928 enum io_wq_cancel cret
;
8932 ret
|= io_uring_try_cancel_iowq(ctx
);
8933 } else if (tctx
&& tctx
->io_wq
) {
8935 * Cancels requests of all rings, not only @ctx, but
8936 * it's fine as the task is in exit/exec.
8938 cret
= io_wq_cancel_cb(tctx
->io_wq
, io_cancel_task_cb
,
8940 ret
|= (cret
!= IO_WQ_CANCEL_NOTFOUND
);
8943 /* SQPOLL thread does its own polling */
8944 if ((!(ctx
->flags
& IORING_SETUP_SQPOLL
) && !files
) ||
8945 (ctx
->sq_data
&& ctx
->sq_data
->thread
== current
)) {
8946 while (!list_empty_careful(&ctx
->iopoll_list
)) {
8947 io_iopoll_try_reap_events(ctx
);
8952 ret
|= io_cancel_defer_files(ctx
, task
, files
);
8953 ret
|= io_poll_remove_all(ctx
, task
, files
);
8954 ret
|= io_kill_timeouts(ctx
, task
, files
);
8955 ret
|= io_run_task_work();
8956 ret
|= io_run_ctx_fallback(ctx
);
8963 static int __io_uring_add_task_file(struct io_ring_ctx
*ctx
)
8965 struct io_uring_task
*tctx
= current
->io_uring
;
8966 struct io_tctx_node
*node
;
8969 if (unlikely(!tctx
)) {
8970 ret
= io_uring_alloc_task_context(current
, ctx
);
8973 tctx
= current
->io_uring
;
8975 if (!xa_load(&tctx
->xa
, (unsigned long)ctx
)) {
8976 node
= kmalloc(sizeof(*node
), GFP_KERNEL
);
8980 node
->task
= current
;
8982 ret
= xa_err(xa_store(&tctx
->xa
, (unsigned long)ctx
,
8989 mutex_lock(&ctx
->uring_lock
);
8990 list_add(&node
->ctx_node
, &ctx
->tctx_list
);
8991 mutex_unlock(&ctx
->uring_lock
);
8998 * Note that this task has used io_uring. We use it for cancelation purposes.
9000 static inline int io_uring_add_task_file(struct io_ring_ctx
*ctx
)
9002 struct io_uring_task
*tctx
= current
->io_uring
;
9004 if (likely(tctx
&& tctx
->last
== ctx
))
9006 return __io_uring_add_task_file(ctx
);
9010 * Remove this io_uring_file -> task mapping.
9012 static void io_uring_del_task_file(unsigned long index
)
9014 struct io_uring_task
*tctx
= current
->io_uring
;
9015 struct io_tctx_node
*node
;
9019 node
= xa_erase(&tctx
->xa
, index
);
9023 WARN_ON_ONCE(current
!= node
->task
);
9024 WARN_ON_ONCE(list_empty(&node
->ctx_node
));
9026 mutex_lock(&node
->ctx
->uring_lock
);
9027 list_del(&node
->ctx_node
);
9028 mutex_unlock(&node
->ctx
->uring_lock
);
9030 if (tctx
->last
== node
->ctx
)
9035 static void io_uring_clean_tctx(struct io_uring_task
*tctx
)
9037 struct io_tctx_node
*node
;
9038 unsigned long index
;
9040 xa_for_each(&tctx
->xa
, index
, node
)
9041 io_uring_del_task_file(index
);
9043 io_wq_put_and_exit(tctx
->io_wq
);
9048 static s64
tctx_inflight(struct io_uring_task
*tctx
, bool tracked
)
9051 return atomic_read(&tctx
->inflight_tracked
);
9052 return percpu_counter_sum(&tctx
->inflight
);
9055 static void io_uring_try_cancel(struct files_struct
*files
)
9057 struct io_uring_task
*tctx
= current
->io_uring
;
9058 struct io_tctx_node
*node
;
9059 unsigned long index
;
9061 xa_for_each(&tctx
->xa
, index
, node
) {
9062 struct io_ring_ctx
*ctx
= node
->ctx
;
9064 /* sqpoll task will cancel all its requests */
9066 io_uring_try_cancel_requests(ctx
, current
, files
);
9070 /* should only be called by SQPOLL task */
9071 static void io_uring_cancel_sqpoll(struct io_sq_data
*sqd
)
9073 struct io_uring_task
*tctx
= current
->io_uring
;
9074 struct io_ring_ctx
*ctx
;
9078 if (!current
->io_uring
)
9080 WARN_ON_ONCE(!sqd
|| sqd
->thread
!= current
);
9082 atomic_inc(&tctx
->in_idle
);
9084 /* read completions before cancelations */
9085 inflight
= tctx_inflight(tctx
, false);
9088 list_for_each_entry(ctx
, &sqd
->ctx_list
, sqd_list
)
9089 io_uring_try_cancel_requests(ctx
, current
, NULL
);
9091 prepare_to_wait(&tctx
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
9093 * If we've seen completions, retry without waiting. This
9094 * avoids a race where a completion comes in before we did
9095 * prepare_to_wait().
9097 if (inflight
== tctx_inflight(tctx
, false))
9099 finish_wait(&tctx
->wait
, &wait
);
9101 atomic_dec(&tctx
->in_idle
);
9105 * Find any io_uring fd that this task has registered or done IO on, and cancel
9108 void __io_uring_cancel(struct files_struct
*files
)
9110 struct io_uring_task
*tctx
= current
->io_uring
;
9114 /* make sure overflow events are dropped */
9115 atomic_inc(&tctx
->in_idle
);
9117 /* read completions before cancelations */
9118 inflight
= tctx_inflight(tctx
, !!files
);
9121 io_uring_try_cancel(files
);
9122 prepare_to_wait(&tctx
->wait
, &wait
, TASK_UNINTERRUPTIBLE
);
9125 * If we've seen completions, retry without waiting. This
9126 * avoids a race where a completion comes in before we did
9127 * prepare_to_wait().
9129 if (inflight
== tctx_inflight(tctx
, !!files
))
9131 finish_wait(&tctx
->wait
, &wait
);
9133 atomic_dec(&tctx
->in_idle
);
9135 io_uring_clean_tctx(tctx
);
9137 /* for exec all current's requests should be gone, kill tctx */
9138 __io_uring_free(current
);
9142 static void *io_uring_validate_mmap_request(struct file
*file
,
9143 loff_t pgoff
, size_t sz
)
9145 struct io_ring_ctx
*ctx
= file
->private_data
;
9146 loff_t offset
= pgoff
<< PAGE_SHIFT
;
9151 case IORING_OFF_SQ_RING
:
9152 case IORING_OFF_CQ_RING
:
9155 case IORING_OFF_SQES
:
9159 return ERR_PTR(-EINVAL
);
9162 page
= virt_to_head_page(ptr
);
9163 if (sz
> page_size(page
))
9164 return ERR_PTR(-EINVAL
);
9171 static int io_uring_mmap(struct file
*file
, struct vm_area_struct
*vma
)
9173 size_t sz
= vma
->vm_end
- vma
->vm_start
;
9177 ptr
= io_uring_validate_mmap_request(file
, vma
->vm_pgoff
, sz
);
9179 return PTR_ERR(ptr
);
9181 pfn
= virt_to_phys(ptr
) >> PAGE_SHIFT
;
9182 return remap_pfn_range(vma
, vma
->vm_start
, pfn
, sz
, vma
->vm_page_prot
);
9185 #else /* !CONFIG_MMU */
9187 static int io_uring_mmap(struct file
*file
, struct vm_area_struct
*vma
)
9189 return vma
->vm_flags
& (VM_SHARED
| VM_MAYSHARE
) ? 0 : -EINVAL
;
9192 static unsigned int io_uring_nommu_mmap_capabilities(struct file
*file
)
9194 return NOMMU_MAP_DIRECT
| NOMMU_MAP_READ
| NOMMU_MAP_WRITE
;
9197 static unsigned long io_uring_nommu_get_unmapped_area(struct file
*file
,
9198 unsigned long addr
, unsigned long len
,
9199 unsigned long pgoff
, unsigned long flags
)
9203 ptr
= io_uring_validate_mmap_request(file
, pgoff
, len
);
9205 return PTR_ERR(ptr
);
9207 return (unsigned long) ptr
;
9210 #endif /* !CONFIG_MMU */
9212 static int io_sqpoll_wait_sq(struct io_ring_ctx
*ctx
)
9217 if (!io_sqring_full(ctx
))
9219 prepare_to_wait(&ctx
->sqo_sq_wait
, &wait
, TASK_INTERRUPTIBLE
);
9221 if (!io_sqring_full(ctx
))
9224 } while (!signal_pending(current
));
9226 finish_wait(&ctx
->sqo_sq_wait
, &wait
);
9230 static int io_get_ext_arg(unsigned flags
, const void __user
*argp
, size_t *argsz
,
9231 struct __kernel_timespec __user
**ts
,
9232 const sigset_t __user
**sig
)
9234 struct io_uring_getevents_arg arg
;
9237 * If EXT_ARG isn't set, then we have no timespec and the argp pointer
9238 * is just a pointer to the sigset_t.
9240 if (!(flags
& IORING_ENTER_EXT_ARG
)) {
9241 *sig
= (const sigset_t __user
*) argp
;
9247 * EXT_ARG is set - ensure we agree on the size of it and copy in our
9248 * timespec and sigset_t pointers if good.
9250 if (*argsz
!= sizeof(arg
))
9252 if (copy_from_user(&arg
, argp
, sizeof(arg
)))
9254 *sig
= u64_to_user_ptr(arg
.sigmask
);
9255 *argsz
= arg
.sigmask_sz
;
9256 *ts
= u64_to_user_ptr(arg
.ts
);
9260 SYSCALL_DEFINE6(io_uring_enter
, unsigned int, fd
, u32
, to_submit
,
9261 u32
, min_complete
, u32
, flags
, const void __user
*, argp
,
9264 struct io_ring_ctx
*ctx
;
9271 if (unlikely(flags
& ~(IORING_ENTER_GETEVENTS
| IORING_ENTER_SQ_WAKEUP
|
9272 IORING_ENTER_SQ_WAIT
| IORING_ENTER_EXT_ARG
)))
9276 if (unlikely(!f
.file
))
9280 if (unlikely(f
.file
->f_op
!= &io_uring_fops
))
9284 ctx
= f
.file
->private_data
;
9285 if (unlikely(!percpu_ref_tryget(&ctx
->refs
)))
9289 if (unlikely(ctx
->flags
& IORING_SETUP_R_DISABLED
))
9293 * For SQ polling, the thread will do all submissions and completions.
9294 * Just return the requested submit count, and wake the thread if
9298 if (ctx
->flags
& IORING_SETUP_SQPOLL
) {
9299 io_cqring_overflow_flush(ctx
, false);
9302 if (unlikely(ctx
->sq_data
->thread
== NULL
)) {
9305 if (flags
& IORING_ENTER_SQ_WAKEUP
)
9306 wake_up(&ctx
->sq_data
->wait
);
9307 if (flags
& IORING_ENTER_SQ_WAIT
) {
9308 ret
= io_sqpoll_wait_sq(ctx
);
9312 submitted
= to_submit
;
9313 } else if (to_submit
) {
9314 ret
= io_uring_add_task_file(ctx
);
9317 mutex_lock(&ctx
->uring_lock
);
9318 submitted
= io_submit_sqes(ctx
, to_submit
);
9319 mutex_unlock(&ctx
->uring_lock
);
9321 if (submitted
!= to_submit
)
9324 if (flags
& IORING_ENTER_GETEVENTS
) {
9325 const sigset_t __user
*sig
;
9326 struct __kernel_timespec __user
*ts
;
9328 ret
= io_get_ext_arg(flags
, argp
, &argsz
, &ts
, &sig
);
9332 min_complete
= min(min_complete
, ctx
->cq_entries
);
9335 * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user
9336 * space applications don't need to do io completion events
9337 * polling again, they can rely on io_sq_thread to do polling
9338 * work, which can reduce cpu usage and uring_lock contention.
9340 if (ctx
->flags
& IORING_SETUP_IOPOLL
&&
9341 !(ctx
->flags
& IORING_SETUP_SQPOLL
)) {
9342 ret
= io_iopoll_check(ctx
, min_complete
);
9344 ret
= io_cqring_wait(ctx
, min_complete
, sig
, argsz
, ts
);
9349 percpu_ref_put(&ctx
->refs
);
9352 return submitted
? submitted
: ret
;
9355 #ifdef CONFIG_PROC_FS
9356 static int io_uring_show_cred(struct seq_file
*m
, unsigned int id
,
9357 const struct cred
*cred
)
9359 struct user_namespace
*uns
= seq_user_ns(m
);
9360 struct group_info
*gi
;
9365 seq_printf(m
, "%5d\n", id
);
9366 seq_put_decimal_ull(m
, "\tUid:\t", from_kuid_munged(uns
, cred
->uid
));
9367 seq_put_decimal_ull(m
, "\t\t", from_kuid_munged(uns
, cred
->euid
));
9368 seq_put_decimal_ull(m
, "\t\t", from_kuid_munged(uns
, cred
->suid
));
9369 seq_put_decimal_ull(m
, "\t\t", from_kuid_munged(uns
, cred
->fsuid
));
9370 seq_put_decimal_ull(m
, "\n\tGid:\t", from_kgid_munged(uns
, cred
->gid
));
9371 seq_put_decimal_ull(m
, "\t\t", from_kgid_munged(uns
, cred
->egid
));
9372 seq_put_decimal_ull(m
, "\t\t", from_kgid_munged(uns
, cred
->sgid
));
9373 seq_put_decimal_ull(m
, "\t\t", from_kgid_munged(uns
, cred
->fsgid
));
9374 seq_puts(m
, "\n\tGroups:\t");
9375 gi
= cred
->group_info
;
9376 for (g
= 0; g
< gi
->ngroups
; g
++) {
9377 seq_put_decimal_ull(m
, g
? " " : "",
9378 from_kgid_munged(uns
, gi
->gid
[g
]));
9380 seq_puts(m
, "\n\tCapEff:\t");
9381 cap
= cred
->cap_effective
;
9382 CAP_FOR_EACH_U32(__capi
)
9383 seq_put_hex_ll(m
, NULL
, cap
.cap
[CAP_LAST_U32
- __capi
], 8);
9388 static void __io_uring_show_fdinfo(struct io_ring_ctx
*ctx
, struct seq_file
*m
)
9390 struct io_sq_data
*sq
= NULL
;
9395 * Avoid ABBA deadlock between the seq lock and the io_uring mutex,
9396 * since fdinfo case grabs it in the opposite direction of normal use
9397 * cases. If we fail to get the lock, we just don't iterate any
9398 * structures that could be going away outside the io_uring mutex.
9400 has_lock
= mutex_trylock(&ctx
->uring_lock
);
9402 if (has_lock
&& (ctx
->flags
& IORING_SETUP_SQPOLL
)) {
9408 seq_printf(m
, "SqThread:\t%d\n", sq
? task_pid_nr(sq
->thread
) : -1);
9409 seq_printf(m
, "SqThreadCpu:\t%d\n", sq
? task_cpu(sq
->thread
) : -1);
9410 seq_printf(m
, "UserFiles:\t%u\n", ctx
->nr_user_files
);
9411 for (i
= 0; has_lock
&& i
< ctx
->nr_user_files
; i
++) {
9412 struct file
*f
= io_file_from_index(ctx
, i
);
9415 seq_printf(m
, "%5u: %s\n", i
, file_dentry(f
)->d_iname
);
9417 seq_printf(m
, "%5u: <none>\n", i
);
9419 seq_printf(m
, "UserBufs:\t%u\n", ctx
->nr_user_bufs
);
9420 for (i
= 0; has_lock
&& i
< ctx
->nr_user_bufs
; i
++) {
9421 struct io_mapped_ubuf
*buf
= ctx
->user_bufs
[i
];
9422 unsigned int len
= buf
->ubuf_end
- buf
->ubuf
;
9424 seq_printf(m
, "%5u: 0x%llx/%u\n", i
, buf
->ubuf
, len
);
9426 if (has_lock
&& !xa_empty(&ctx
->personalities
)) {
9427 unsigned long index
;
9428 const struct cred
*cred
;
9430 seq_printf(m
, "Personalities:\n");
9431 xa_for_each(&ctx
->personalities
, index
, cred
)
9432 io_uring_show_cred(m
, index
, cred
);
9434 seq_printf(m
, "PollList:\n");
9435 spin_lock_irq(&ctx
->completion_lock
);
9436 for (i
= 0; i
< (1U << ctx
->cancel_hash_bits
); i
++) {
9437 struct hlist_head
*list
= &ctx
->cancel_hash
[i
];
9438 struct io_kiocb
*req
;
9440 hlist_for_each_entry(req
, list
, hash_node
)
9441 seq_printf(m
, " op=%d, task_works=%d\n", req
->opcode
,
9442 req
->task
->task_works
!= NULL
);
9444 spin_unlock_irq(&ctx
->completion_lock
);
9446 mutex_unlock(&ctx
->uring_lock
);
9449 static void io_uring_show_fdinfo(struct seq_file
*m
, struct file
*f
)
9451 struct io_ring_ctx
*ctx
= f
->private_data
;
9453 if (percpu_ref_tryget(&ctx
->refs
)) {
9454 __io_uring_show_fdinfo(ctx
, m
);
9455 percpu_ref_put(&ctx
->refs
);
9460 static const struct file_operations io_uring_fops
= {
9461 .release
= io_uring_release
,
9462 .mmap
= io_uring_mmap
,
9464 .get_unmapped_area
= io_uring_nommu_get_unmapped_area
,
9465 .mmap_capabilities
= io_uring_nommu_mmap_capabilities
,
9467 .poll
= io_uring_poll
,
9468 .fasync
= io_uring_fasync
,
9469 #ifdef CONFIG_PROC_FS
9470 .show_fdinfo
= io_uring_show_fdinfo
,
9474 static int io_allocate_scq_urings(struct io_ring_ctx
*ctx
,
9475 struct io_uring_params
*p
)
9477 struct io_rings
*rings
;
9478 size_t size
, sq_array_offset
;
9480 /* make sure these are sane, as we already accounted them */
9481 ctx
->sq_entries
= p
->sq_entries
;
9482 ctx
->cq_entries
= p
->cq_entries
;
9484 size
= rings_size(p
->sq_entries
, p
->cq_entries
, &sq_array_offset
);
9485 if (size
== SIZE_MAX
)
9488 rings
= io_mem_alloc(size
);
9493 ctx
->sq_array
= (u32
*)((char *)rings
+ sq_array_offset
);
9494 rings
->sq_ring_mask
= p
->sq_entries
- 1;
9495 rings
->cq_ring_mask
= p
->cq_entries
- 1;
9496 rings
->sq_ring_entries
= p
->sq_entries
;
9497 rings
->cq_ring_entries
= p
->cq_entries
;
9498 ctx
->sq_mask
= rings
->sq_ring_mask
;
9499 ctx
->cq_mask
= rings
->cq_ring_mask
;
9501 size
= array_size(sizeof(struct io_uring_sqe
), p
->sq_entries
);
9502 if (size
== SIZE_MAX
) {
9503 io_mem_free(ctx
->rings
);
9508 ctx
->sq_sqes
= io_mem_alloc(size
);
9509 if (!ctx
->sq_sqes
) {
9510 io_mem_free(ctx
->rings
);
9518 static int io_uring_install_fd(struct io_ring_ctx
*ctx
, struct file
*file
)
9522 fd
= get_unused_fd_flags(O_RDWR
| O_CLOEXEC
);
9526 ret
= io_uring_add_task_file(ctx
);
9531 fd_install(fd
, file
);
9536 * Allocate an anonymous fd, this is what constitutes the application
9537 * visible backing of an io_uring instance. The application mmaps this
9538 * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled,
9539 * we have to tie this fd to a socket for file garbage collection purposes.
9541 static struct file
*io_uring_get_file(struct io_ring_ctx
*ctx
)
9544 #if defined(CONFIG_UNIX)
9547 ret
= sock_create_kern(&init_net
, PF_UNIX
, SOCK_RAW
, IPPROTO_IP
,
9550 return ERR_PTR(ret
);
9553 file
= anon_inode_getfile("[io_uring]", &io_uring_fops
, ctx
,
9554 O_RDWR
| O_CLOEXEC
);
9555 #if defined(CONFIG_UNIX)
9557 sock_release(ctx
->ring_sock
);
9558 ctx
->ring_sock
= NULL
;
9560 ctx
->ring_sock
->file
= file
;
9566 static int io_uring_create(unsigned entries
, struct io_uring_params
*p
,
9567 struct io_uring_params __user
*params
)
9569 struct io_ring_ctx
*ctx
;
9575 if (entries
> IORING_MAX_ENTRIES
) {
9576 if (!(p
->flags
& IORING_SETUP_CLAMP
))
9578 entries
= IORING_MAX_ENTRIES
;
9582 * Use twice as many entries for the CQ ring. It's possible for the
9583 * application to drive a higher depth than the size of the SQ ring,
9584 * since the sqes are only used at submission time. This allows for
9585 * some flexibility in overcommitting a bit. If the application has
9586 * set IORING_SETUP_CQSIZE, it will have passed in the desired number
9587 * of CQ ring entries manually.
9589 p
->sq_entries
= roundup_pow_of_two(entries
);
9590 if (p
->flags
& IORING_SETUP_CQSIZE
) {
9592 * If IORING_SETUP_CQSIZE is set, we do the same roundup
9593 * to a power-of-two, if it isn't already. We do NOT impose
9594 * any cq vs sq ring sizing.
9598 if (p
->cq_entries
> IORING_MAX_CQ_ENTRIES
) {
9599 if (!(p
->flags
& IORING_SETUP_CLAMP
))
9601 p
->cq_entries
= IORING_MAX_CQ_ENTRIES
;
9603 p
->cq_entries
= roundup_pow_of_two(p
->cq_entries
);
9604 if (p
->cq_entries
< p
->sq_entries
)
9607 p
->cq_entries
= 2 * p
->sq_entries
;
9610 ctx
= io_ring_ctx_alloc(p
);
9613 ctx
->compat
= in_compat_syscall();
9614 if (!capable(CAP_IPC_LOCK
))
9615 ctx
->user
= get_uid(current_user());
9618 * This is just grabbed for accounting purposes. When a process exits,
9619 * the mm is exited and dropped before the files, hence we need to hang
9620 * on to this mm purely for the purposes of being able to unaccount
9621 * memory (locked/pinned vm). It's not used for anything else.
9623 mmgrab(current
->mm
);
9624 ctx
->mm_account
= current
->mm
;
9626 ret
= io_allocate_scq_urings(ctx
, p
);
9630 ret
= io_sq_offload_create(ctx
, p
);
9633 /* always set a rsrc node */
9634 ret
= io_rsrc_node_switch_start(ctx
);
9637 io_rsrc_node_switch(ctx
, NULL
);
9639 memset(&p
->sq_off
, 0, sizeof(p
->sq_off
));
9640 p
->sq_off
.head
= offsetof(struct io_rings
, sq
.head
);
9641 p
->sq_off
.tail
= offsetof(struct io_rings
, sq
.tail
);
9642 p
->sq_off
.ring_mask
= offsetof(struct io_rings
, sq_ring_mask
);
9643 p
->sq_off
.ring_entries
= offsetof(struct io_rings
, sq_ring_entries
);
9644 p
->sq_off
.flags
= offsetof(struct io_rings
, sq_flags
);
9645 p
->sq_off
.dropped
= offsetof(struct io_rings
, sq_dropped
);
9646 p
->sq_off
.array
= (char *)ctx
->sq_array
- (char *)ctx
->rings
;
9648 memset(&p
->cq_off
, 0, sizeof(p
->cq_off
));
9649 p
->cq_off
.head
= offsetof(struct io_rings
, cq
.head
);
9650 p
->cq_off
.tail
= offsetof(struct io_rings
, cq
.tail
);
9651 p
->cq_off
.ring_mask
= offsetof(struct io_rings
, cq_ring_mask
);
9652 p
->cq_off
.ring_entries
= offsetof(struct io_rings
, cq_ring_entries
);
9653 p
->cq_off
.overflow
= offsetof(struct io_rings
, cq_overflow
);
9654 p
->cq_off
.cqes
= offsetof(struct io_rings
, cqes
);
9655 p
->cq_off
.flags
= offsetof(struct io_rings
, cq_flags
);
9657 p
->features
= IORING_FEAT_SINGLE_MMAP
| IORING_FEAT_NODROP
|
9658 IORING_FEAT_SUBMIT_STABLE
| IORING_FEAT_RW_CUR_POS
|
9659 IORING_FEAT_CUR_PERSONALITY
| IORING_FEAT_FAST_POLL
|
9660 IORING_FEAT_POLL_32BITS
| IORING_FEAT_SQPOLL_NONFIXED
|
9661 IORING_FEAT_EXT_ARG
| IORING_FEAT_NATIVE_WORKERS
;
9663 if (copy_to_user(params
, p
, sizeof(*p
))) {
9668 file
= io_uring_get_file(ctx
);
9670 ret
= PTR_ERR(file
);
9675 * Install ring fd as the very last thing, so we don't risk someone
9676 * having closed it before we finish setup
9678 ret
= io_uring_install_fd(ctx
, file
);
9680 /* fput will clean it up */
9685 trace_io_uring_create(ret
, ctx
, p
->sq_entries
, p
->cq_entries
, p
->flags
);
9688 io_ring_ctx_wait_and_kill(ctx
);
9693 * Sets up an aio uring context, and returns the fd. Applications asks for a
9694 * ring size, we return the actual sq/cq ring sizes (among other things) in the
9695 * params structure passed in.
9697 static long io_uring_setup(u32 entries
, struct io_uring_params __user
*params
)
9699 struct io_uring_params p
;
9702 if (copy_from_user(&p
, params
, sizeof(p
)))
9704 for (i
= 0; i
< ARRAY_SIZE(p
.resv
); i
++) {
9709 if (p
.flags
& ~(IORING_SETUP_IOPOLL
| IORING_SETUP_SQPOLL
|
9710 IORING_SETUP_SQ_AFF
| IORING_SETUP_CQSIZE
|
9711 IORING_SETUP_CLAMP
| IORING_SETUP_ATTACH_WQ
|
9712 IORING_SETUP_R_DISABLED
))
9715 return io_uring_create(entries
, &p
, params
);
9718 SYSCALL_DEFINE2(io_uring_setup
, u32
, entries
,
9719 struct io_uring_params __user
*, params
)
9721 return io_uring_setup(entries
, params
);
9724 static int io_probe(struct io_ring_ctx
*ctx
, void __user
*arg
, unsigned nr_args
)
9726 struct io_uring_probe
*p
;
9730 size
= struct_size(p
, ops
, nr_args
);
9731 if (size
== SIZE_MAX
)
9733 p
= kzalloc(size
, GFP_KERNEL
);
9738 if (copy_from_user(p
, arg
, size
))
9741 if (memchr_inv(p
, 0, size
))
9744 p
->last_op
= IORING_OP_LAST
- 1;
9745 if (nr_args
> IORING_OP_LAST
)
9746 nr_args
= IORING_OP_LAST
;
9748 for (i
= 0; i
< nr_args
; i
++) {
9750 if (!io_op_defs
[i
].not_supported
)
9751 p
->ops
[i
].flags
= IO_URING_OP_SUPPORTED
;
9756 if (copy_to_user(arg
, p
, size
))
9763 static int io_register_personality(struct io_ring_ctx
*ctx
)
9765 const struct cred
*creds
;
9769 creds
= get_current_cred();
9771 ret
= xa_alloc_cyclic(&ctx
->personalities
, &id
, (void *)creds
,
9772 XA_LIMIT(0, USHRT_MAX
), &ctx
->pers_next
, GFP_KERNEL
);
9779 static int io_register_restrictions(struct io_ring_ctx
*ctx
, void __user
*arg
,
9780 unsigned int nr_args
)
9782 struct io_uring_restriction
*res
;
9786 /* Restrictions allowed only if rings started disabled */
9787 if (!(ctx
->flags
& IORING_SETUP_R_DISABLED
))
9790 /* We allow only a single restrictions registration */
9791 if (ctx
->restrictions
.registered
)
9794 if (!arg
|| nr_args
> IORING_MAX_RESTRICTIONS
)
9797 size
= array_size(nr_args
, sizeof(*res
));
9798 if (size
== SIZE_MAX
)
9801 res
= memdup_user(arg
, size
);
9803 return PTR_ERR(res
);
9807 for (i
= 0; i
< nr_args
; i
++) {
9808 switch (res
[i
].opcode
) {
9809 case IORING_RESTRICTION_REGISTER_OP
:
9810 if (res
[i
].register_op
>= IORING_REGISTER_LAST
) {
9815 __set_bit(res
[i
].register_op
,
9816 ctx
->restrictions
.register_op
);
9818 case IORING_RESTRICTION_SQE_OP
:
9819 if (res
[i
].sqe_op
>= IORING_OP_LAST
) {
9824 __set_bit(res
[i
].sqe_op
, ctx
->restrictions
.sqe_op
);
9826 case IORING_RESTRICTION_SQE_FLAGS_ALLOWED
:
9827 ctx
->restrictions
.sqe_flags_allowed
= res
[i
].sqe_flags
;
9829 case IORING_RESTRICTION_SQE_FLAGS_REQUIRED
:
9830 ctx
->restrictions
.sqe_flags_required
= res
[i
].sqe_flags
;
9839 /* Reset all restrictions if an error happened */
9841 memset(&ctx
->restrictions
, 0, sizeof(ctx
->restrictions
));
9843 ctx
->restrictions
.registered
= true;
9849 static int io_register_enable_rings(struct io_ring_ctx
*ctx
)
9851 if (!(ctx
->flags
& IORING_SETUP_R_DISABLED
))
9854 if (ctx
->restrictions
.registered
)
9855 ctx
->restricted
= 1;
9857 ctx
->flags
&= ~IORING_SETUP_R_DISABLED
;
9858 if (ctx
->sq_data
&& wq_has_sleeper(&ctx
->sq_data
->wait
))
9859 wake_up(&ctx
->sq_data
->wait
);
9863 static int __io_register_rsrc_update(struct io_ring_ctx
*ctx
, unsigned type
,
9864 struct io_uring_rsrc_update2
*up
,
9872 if (check_add_overflow(up
->offset
, nr_args
, &tmp
))
9874 err
= io_rsrc_node_switch_start(ctx
);
9879 case IORING_RSRC_FILE
:
9880 return __io_sqe_files_update(ctx
, up
, nr_args
);
9881 case IORING_RSRC_BUFFER
:
9882 return __io_sqe_buffers_update(ctx
, up
, nr_args
);
9887 static int io_register_files_update(struct io_ring_ctx
*ctx
, void __user
*arg
,
9890 struct io_uring_rsrc_update2 up
;
9894 memset(&up
, 0, sizeof(up
));
9895 if (copy_from_user(&up
, arg
, sizeof(struct io_uring_rsrc_update
)))
9897 return __io_register_rsrc_update(ctx
, IORING_RSRC_FILE
, &up
, nr_args
);
9900 static int io_register_rsrc_update(struct io_ring_ctx
*ctx
, void __user
*arg
,
9903 struct io_uring_rsrc_update2 up
;
9905 if (size
!= sizeof(up
))
9907 if (copy_from_user(&up
, arg
, sizeof(up
)))
9911 return __io_register_rsrc_update(ctx
, up
.type
, &up
, up
.nr
);
9914 static int io_register_rsrc(struct io_ring_ctx
*ctx
, void __user
*arg
,
9917 struct io_uring_rsrc_register rr
;
9919 /* keep it extendible */
9920 if (size
!= sizeof(rr
))
9923 memset(&rr
, 0, sizeof(rr
));
9924 if (copy_from_user(&rr
, arg
, size
))
9930 case IORING_RSRC_FILE
:
9931 return io_sqe_files_register(ctx
, u64_to_user_ptr(rr
.data
),
9932 rr
.nr
, u64_to_user_ptr(rr
.tags
));
9933 case IORING_RSRC_BUFFER
:
9934 return io_sqe_buffers_register(ctx
, u64_to_user_ptr(rr
.data
),
9935 rr
.nr
, u64_to_user_ptr(rr
.tags
));
9940 static bool io_register_op_must_quiesce(int op
)
9943 case IORING_REGISTER_BUFFERS
:
9944 case IORING_UNREGISTER_BUFFERS
:
9945 case IORING_REGISTER_FILES
:
9946 case IORING_UNREGISTER_FILES
:
9947 case IORING_REGISTER_FILES_UPDATE
:
9948 case IORING_REGISTER_PROBE
:
9949 case IORING_REGISTER_PERSONALITY
:
9950 case IORING_UNREGISTER_PERSONALITY
:
9951 case IORING_REGISTER_RSRC
:
9952 case IORING_REGISTER_RSRC_UPDATE
:
9959 static int __io_uring_register(struct io_ring_ctx
*ctx
, unsigned opcode
,
9960 void __user
*arg
, unsigned nr_args
)
9961 __releases(ctx
->uring_lock
)
9962 __acquires(ctx
->uring_lock
)
9967 * We're inside the ring mutex, if the ref is already dying, then
9968 * someone else killed the ctx or is already going through
9969 * io_uring_register().
9971 if (percpu_ref_is_dying(&ctx
->refs
))
9974 if (ctx
->restricted
) {
9975 if (opcode
>= IORING_REGISTER_LAST
)
9977 opcode
= array_index_nospec(opcode
, IORING_REGISTER_LAST
);
9978 if (!test_bit(opcode
, ctx
->restrictions
.register_op
))
9982 if (io_register_op_must_quiesce(opcode
)) {
9983 percpu_ref_kill(&ctx
->refs
);
9986 * Drop uring mutex before waiting for references to exit. If
9987 * another thread is currently inside io_uring_enter() it might
9988 * need to grab the uring_lock to make progress. If we hold it
9989 * here across the drain wait, then we can deadlock. It's safe
9990 * to drop the mutex here, since no new references will come in
9991 * after we've killed the percpu ref.
9993 mutex_unlock(&ctx
->uring_lock
);
9995 ret
= wait_for_completion_interruptible(&ctx
->ref_comp
);
9998 ret
= io_run_task_work_sig();
10002 mutex_lock(&ctx
->uring_lock
);
10005 io_refs_resurrect(&ctx
->refs
, &ctx
->ref_comp
);
10011 case IORING_REGISTER_BUFFERS
:
10012 ret
= io_sqe_buffers_register(ctx
, arg
, nr_args
, NULL
);
10014 case IORING_UNREGISTER_BUFFERS
:
10016 if (arg
|| nr_args
)
10018 ret
= io_sqe_buffers_unregister(ctx
);
10020 case IORING_REGISTER_FILES
:
10021 ret
= io_sqe_files_register(ctx
, arg
, nr_args
, NULL
);
10023 case IORING_UNREGISTER_FILES
:
10025 if (arg
|| nr_args
)
10027 ret
= io_sqe_files_unregister(ctx
);
10029 case IORING_REGISTER_FILES_UPDATE
:
10030 ret
= io_register_files_update(ctx
, arg
, nr_args
);
10032 case IORING_REGISTER_EVENTFD
:
10033 case IORING_REGISTER_EVENTFD_ASYNC
:
10037 ret
= io_eventfd_register(ctx
, arg
);
10040 if (opcode
== IORING_REGISTER_EVENTFD_ASYNC
)
10041 ctx
->eventfd_async
= 1;
10043 ctx
->eventfd_async
= 0;
10045 case IORING_UNREGISTER_EVENTFD
:
10047 if (arg
|| nr_args
)
10049 ret
= io_eventfd_unregister(ctx
);
10051 case IORING_REGISTER_PROBE
:
10053 if (!arg
|| nr_args
> 256)
10055 ret
= io_probe(ctx
, arg
, nr_args
);
10057 case IORING_REGISTER_PERSONALITY
:
10059 if (arg
|| nr_args
)
10061 ret
= io_register_personality(ctx
);
10063 case IORING_UNREGISTER_PERSONALITY
:
10067 ret
= io_unregister_personality(ctx
, nr_args
);
10069 case IORING_REGISTER_ENABLE_RINGS
:
10071 if (arg
|| nr_args
)
10073 ret
= io_register_enable_rings(ctx
);
10075 case IORING_REGISTER_RESTRICTIONS
:
10076 ret
= io_register_restrictions(ctx
, arg
, nr_args
);
10078 case IORING_REGISTER_RSRC
:
10079 ret
= io_register_rsrc(ctx
, arg
, nr_args
);
10081 case IORING_REGISTER_RSRC_UPDATE
:
10082 ret
= io_register_rsrc_update(ctx
, arg
, nr_args
);
10089 if (io_register_op_must_quiesce(opcode
)) {
10090 /* bring the ctx back to life */
10091 percpu_ref_reinit(&ctx
->refs
);
10092 reinit_completion(&ctx
->ref_comp
);
10097 SYSCALL_DEFINE4(io_uring_register
, unsigned int, fd
, unsigned int, opcode
,
10098 void __user
*, arg
, unsigned int, nr_args
)
10100 struct io_ring_ctx
*ctx
;
10109 if (f
.file
->f_op
!= &io_uring_fops
)
10112 ctx
= f
.file
->private_data
;
10114 io_run_task_work();
10116 mutex_lock(&ctx
->uring_lock
);
10117 ret
= __io_uring_register(ctx
, opcode
, arg
, nr_args
);
10118 mutex_unlock(&ctx
->uring_lock
);
10119 trace_io_uring_register(ctx
, opcode
, ctx
->nr_user_files
, ctx
->nr_user_bufs
,
10120 ctx
->cq_ev_fd
!= NULL
, ret
);
10126 static int __init
io_uring_init(void)
10128 #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \
10129 BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \
10130 BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \
10133 #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \
10134 __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename)
10135 BUILD_BUG_ON(sizeof(struct io_uring_sqe
) != 64);
10136 BUILD_BUG_SQE_ELEM(0, __u8
, opcode
);
10137 BUILD_BUG_SQE_ELEM(1, __u8
, flags
);
10138 BUILD_BUG_SQE_ELEM(2, __u16
, ioprio
);
10139 BUILD_BUG_SQE_ELEM(4, __s32
, fd
);
10140 BUILD_BUG_SQE_ELEM(8, __u64
, off
);
10141 BUILD_BUG_SQE_ELEM(8, __u64
, addr2
);
10142 BUILD_BUG_SQE_ELEM(16, __u64
, addr
);
10143 BUILD_BUG_SQE_ELEM(16, __u64
, splice_off_in
);
10144 BUILD_BUG_SQE_ELEM(24, __u32
, len
);
10145 BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t
, rw_flags
);
10146 BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags
);
10147 BUILD_BUG_SQE_ELEM(28, /* compat */ __u32
, rw_flags
);
10148 BUILD_BUG_SQE_ELEM(28, __u32
, fsync_flags
);
10149 BUILD_BUG_SQE_ELEM(28, /* compat */ __u16
, poll_events
);
10150 BUILD_BUG_SQE_ELEM(28, __u32
, poll32_events
);
10151 BUILD_BUG_SQE_ELEM(28, __u32
, sync_range_flags
);
10152 BUILD_BUG_SQE_ELEM(28, __u32
, msg_flags
);
10153 BUILD_BUG_SQE_ELEM(28, __u32
, timeout_flags
);
10154 BUILD_BUG_SQE_ELEM(28, __u32
, accept_flags
);
10155 BUILD_BUG_SQE_ELEM(28, __u32
, cancel_flags
);
10156 BUILD_BUG_SQE_ELEM(28, __u32
, open_flags
);
10157 BUILD_BUG_SQE_ELEM(28, __u32
, statx_flags
);
10158 BUILD_BUG_SQE_ELEM(28, __u32
, fadvise_advice
);
10159 BUILD_BUG_SQE_ELEM(28, __u32
, splice_flags
);
10160 BUILD_BUG_SQE_ELEM(32, __u64
, user_data
);
10161 BUILD_BUG_SQE_ELEM(40, __u16
, buf_index
);
10162 BUILD_BUG_SQE_ELEM(42, __u16
, personality
);
10163 BUILD_BUG_SQE_ELEM(44, __s32
, splice_fd_in
);
10165 BUILD_BUG_ON(sizeof(struct io_uring_files_update
) !=
10166 sizeof(struct io_uring_rsrc_update
));
10167 BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update
) >
10168 sizeof(struct io_uring_rsrc_update2
));
10169 /* should fit into one byte */
10170 BUILD_BUG_ON(SQE_VALID_FLAGS
>= (1 << 8));
10172 BUILD_BUG_ON(ARRAY_SIZE(io_op_defs
) != IORING_OP_LAST
);
10173 BUILD_BUG_ON(__REQ_F_LAST_BIT
>= 8 * sizeof(int));
10174 req_cachep
= KMEM_CACHE(io_kiocb
, SLAB_HWCACHE_ALIGN
| SLAB_PANIC
|
10178 __initcall(io_uring_init
);