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_cqe (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>
81 #include <linux/tracehook.h>
83 #define CREATE_TRACE_POINTS
84 #include <trace/events/io_uring.h>
86 #include <uapi/linux/io_uring.h>
91 #define IORING_MAX_ENTRIES 32768
92 #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES)
93 #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8
96 #define IORING_MAX_FIXED_FILES (1U << 15)
97 #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \
98 IORING_REGISTER_LAST + IORING_OP_LAST)
100 #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
101 #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
102 #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
104 #define IORING_MAX_REG_BUFFERS (1U << 14)
106 #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \
107 IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
109 #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \
110 REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS)
112 #define IO_TCTX_REFS_CACHE_NR (1U << 10)
115 u32 head ____cacheline_aligned_in_smp;
116 u32 tail ____cacheline_aligned_in_smp;
120 * This data is shared with the application through the mmap at offsets
121 * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING.
123 * The offsets to the member fields are published through struct
124 * io_sqring_offsets when calling io_uring_setup.
128 * Head and tail offsets into the ring; the offsets need to be
129 * masked to get valid indices.
131 * The kernel controls head of the sq ring and the tail of the cq ring,
132 * and the application controls tail of the sq ring and the head of the
135 struct io_uring sq, cq;
137 * Bitmasks to apply to head and tail offsets (constant, equals
140 u32 sq_ring_mask, cq_ring_mask;
141 /* Ring sizes (constant, power of 2) */
142 u32 sq_ring_entries, cq_ring_entries;
144 * Number of invalid entries dropped by the kernel due to
145 * invalid index stored in array
147 * Written by the kernel, shouldn't be modified by the
148 * application (i.e. get number of "new events" by comparing to
151 * After a new SQ head value was read by the application this
152 * counter includes all submissions that were dropped reaching
153 * the new SQ head (and possibly more).
159 * Written by the kernel, shouldn't be modified by the
162 * The application needs a full memory barrier before checking
163 * for IORING_SQ_NEED_WAKEUP after updating the sq tail.
169 * Written by the application, shouldn't be modified by the
174 * Number of completion events lost because the queue was full;
175 * this should be avoided by the application by making sure
176 * there are not more requests pending than there is space in
177 * the completion queue.
179 * Written by the kernel, shouldn't be modified by the
180 * application (i.e. get number of "new events" by comparing to
183 * As completion events come in out of order this counter is not
184 * ordered with any other data.
188 * Ring buffer of completion events.
190 * The kernel writes completion events fresh every time they are
191 * produced, so the application is allowed to modify pending
194 struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp;
197 enum io_uring_cmd_flags {
198 IO_URING_F_NONBLOCK = 1,
199 IO_URING_F_COMPLETE_DEFER = 2,
202 struct io_mapped_ubuf {
205 unsigned int nr_bvecs;
206 unsigned long acct_pages;
207 struct bio_vec bvec[];
212 struct io_overflow_cqe {
213 struct io_uring_cqe cqe;
214 struct list_head list;
217 struct io_fixed_file {
218 /* file * with additional FFS_* flags */
219 unsigned long file_ptr;
223 struct list_head list;
228 struct io_mapped_ubuf *buf;
232 struct io_file_table {
233 struct io_fixed_file *files;
236 struct io_rsrc_node {
237 struct percpu_ref refs;
238 struct list_head node;
239 struct list_head rsrc_list;
240 struct io_rsrc_data *rsrc_data;
241 struct llist_node llist;
245 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
247 struct io_rsrc_data {
248 struct io_ring_ctx *ctx;
254 struct completion done;
259 struct list_head list;
265 struct io_restriction {
266 DECLARE_BITMAP(register_op, IORING_REGISTER_LAST);
267 DECLARE_BITMAP(sqe_op, IORING_OP_LAST);
268 u8 sqe_flags_allowed;
269 u8 sqe_flags_required;
274 IO_SQ_THREAD_SHOULD_STOP = 0,
275 IO_SQ_THREAD_SHOULD_PARK,
280 atomic_t park_pending;
283 /* ctx's that are using this sqd */
284 struct list_head ctx_list;
286 struct task_struct *thread;
287 struct wait_queue_head wait;
289 unsigned sq_thread_idle;
295 struct completion exited;
298 #define IO_COMPL_BATCH 32
299 #define IO_REQ_CACHE_SIZE 32
300 #define IO_REQ_ALLOC_BATCH 8
302 struct io_submit_link {
303 struct io_kiocb *head;
304 struct io_kiocb *last;
307 struct io_submit_state {
308 struct blk_plug plug;
309 struct io_submit_link link;
312 * io_kiocb alloc cache
314 void *reqs[IO_REQ_CACHE_SIZE];
315 unsigned int free_reqs;
320 * Batch completion logic
322 struct io_kiocb *compl_reqs[IO_COMPL_BATCH];
323 unsigned int compl_nr;
324 /* inline/task_work completion list, under ->uring_lock */
325 struct list_head free_list;
327 unsigned int ios_left;
331 /* const or read-mostly hot data */
333 struct percpu_ref refs;
335 struct io_rings *rings;
337 unsigned int compat: 1;
338 unsigned int drain_next: 1;
339 unsigned int eventfd_async: 1;
340 unsigned int restricted: 1;
341 unsigned int off_timeout_used: 1;
342 unsigned int drain_active: 1;
343 } ____cacheline_aligned_in_smp;
345 /* submission data */
347 struct mutex uring_lock;
350 * Ring buffer of indices into array of io_uring_sqe, which is
351 * mmapped by the application using the IORING_OFF_SQES offset.
353 * This indirection could e.g. be used to assign fixed
354 * io_uring_sqe entries to operations and only submit them to
355 * the queue when needed.
357 * The kernel modifies neither the indices array nor the entries
361 struct io_uring_sqe *sq_sqes;
362 unsigned cached_sq_head;
364 struct list_head defer_list;
367 * Fixed resources fast path, should be accessed only under
368 * uring_lock, and updated through io_uring_register(2)
370 struct io_rsrc_node *rsrc_node;
371 struct io_file_table file_table;
372 unsigned nr_user_files;
373 unsigned nr_user_bufs;
374 struct io_mapped_ubuf **user_bufs;
376 struct io_submit_state submit_state;
377 struct list_head timeout_list;
378 struct list_head ltimeout_list;
379 struct list_head cq_overflow_list;
380 struct xarray io_buffers;
381 struct xarray personalities;
383 unsigned sq_thread_idle;
384 } ____cacheline_aligned_in_smp;
386 /* IRQ completion list, under ->completion_lock */
387 struct list_head locked_free_list;
388 unsigned int locked_free_nr;
390 const struct cred *sq_creds; /* cred used for __io_sq_thread() */
391 struct io_sq_data *sq_data; /* if using sq thread polling */
393 struct wait_queue_head sqo_sq_wait;
394 struct list_head sqd_list;
396 unsigned long check_cq_overflow;
399 unsigned cached_cq_tail;
401 struct eventfd_ctx *cq_ev_fd;
402 struct wait_queue_head poll_wait;
403 struct wait_queue_head cq_wait;
405 atomic_t cq_timeouts;
406 unsigned cq_last_tm_flush;
407 } ____cacheline_aligned_in_smp;
410 spinlock_t completion_lock;
412 spinlock_t timeout_lock;
415 * ->iopoll_list is protected by the ctx->uring_lock for
416 * io_uring instances that don't use IORING_SETUP_SQPOLL.
417 * For SQPOLL, only the single threaded io_sq_thread() will
418 * manipulate the list, hence no extra locking is needed there.
420 struct list_head iopoll_list;
421 struct hlist_head *cancel_hash;
422 unsigned cancel_hash_bits;
423 bool poll_multi_queue;
424 } ____cacheline_aligned_in_smp;
426 struct io_restriction restrictions;
428 /* slow path rsrc auxilary data, used by update/register */
430 struct io_rsrc_node *rsrc_backup_node;
431 struct io_mapped_ubuf *dummy_ubuf;
432 struct io_rsrc_data *file_data;
433 struct io_rsrc_data *buf_data;
435 struct delayed_work rsrc_put_work;
436 struct llist_head rsrc_put_llist;
437 struct list_head rsrc_ref_list;
438 spinlock_t rsrc_ref_lock;
441 /* Keep this last, we don't need it for the fast path */
443 #if defined(CONFIG_UNIX)
444 struct socket *ring_sock;
446 /* hashed buffered write serialization */
447 struct io_wq_hash *hash_map;
449 /* Only used for accounting purposes */
450 struct user_struct *user;
451 struct mm_struct *mm_account;
453 /* ctx exit and cancelation */
454 struct llist_head fallback_llist;
455 struct delayed_work fallback_work;
456 struct work_struct exit_work;
457 struct list_head tctx_list;
458 struct completion ref_comp;
460 bool iowq_limits_set;
464 struct io_uring_task {
465 /* submission side */
468 struct wait_queue_head wait;
469 const struct io_ring_ctx *last;
471 struct percpu_counter inflight;
472 atomic_t inflight_tracked;
475 spinlock_t task_lock;
476 struct io_wq_work_list task_list;
477 struct callback_head task_work;
482 * First field must be the file pointer in all the
483 * iocb unions! See also 'struct kiocb' in <linux/fs.h>
485 struct io_poll_iocb {
487 struct wait_queue_head *head;
491 struct wait_queue_entry wait;
494 struct io_poll_update {
500 bool update_user_data;
509 struct io_timeout_data {
510 struct io_kiocb *req;
511 struct hrtimer timer;
512 struct timespec64 ts;
513 enum hrtimer_mode mode;
519 struct sockaddr __user *addr;
520 int __user *addr_len;
523 unsigned long nofile;
543 struct list_head list;
544 /* head of the link, used by linked timeouts only */
545 struct io_kiocb *head;
546 /* for linked completions */
547 struct io_kiocb *prev;
550 struct io_timeout_rem {
555 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;
590 struct filename *filename;
592 unsigned long nofile;
595 struct io_rsrc_update {
621 struct epoll_event event;
625 struct file *file_out;
626 struct file *file_in;
633 struct io_provide_buf {
647 const char __user *filename;
648 struct statx __user *buffer;
660 struct filename *oldpath;
661 struct filename *newpath;
669 struct filename *filename;
676 struct filename *filename;
682 struct filename *oldpath;
683 struct filename *newpath;
690 struct filename *oldpath;
691 struct filename *newpath;
695 struct io_completion {
700 struct io_async_connect {
701 struct sockaddr_storage address;
704 struct io_async_msghdr {
705 struct iovec fast_iov[UIO_FASTIOV];
706 /* points to an allocated iov, if NULL we use fast_iov instead */
707 struct iovec *free_iov;
708 struct sockaddr __user *uaddr;
710 struct sockaddr_storage addr;
714 struct iovec fast_iov[UIO_FASTIOV];
715 const struct iovec *free_iovec;
716 struct iov_iter iter;
717 struct iov_iter_state iter_state;
719 struct wait_page_queue wpq;
723 REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT,
724 REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT,
725 REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT,
726 REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT,
727 REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT,
728 REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT,
730 /* first byte is taken by user flags, shift it to not overlap */
735 REQ_F_LINK_TIMEOUT_BIT,
736 REQ_F_NEED_CLEANUP_BIT,
738 REQ_F_BUFFER_SELECTED_BIT,
739 REQ_F_COMPLETE_INLINE_BIT,
743 REQ_F_ARM_LTIMEOUT_BIT,
744 /* keep async read/write and isreg together and in order */
745 REQ_F_NOWAIT_READ_BIT,
746 REQ_F_NOWAIT_WRITE_BIT,
749 /* not a real bit, just to check we're not overflowing the space */
755 REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT),
756 /* drain existing IO first */
757 REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT),
759 REQ_F_LINK = BIT(REQ_F_LINK_BIT),
760 /* doesn't sever on completion < 0 */
761 REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT),
763 REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT),
764 /* IOSQE_BUFFER_SELECT */
765 REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT),
767 /* fail rest of links */
768 REQ_F_FAIL = BIT(REQ_F_FAIL_BIT),
769 /* on inflight list, should be cancelled and waited on exit reliably */
770 REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT),
771 /* read/write uses file position */
772 REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT),
773 /* must not punt to workers */
774 REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT),
775 /* has or had linked timeout */
776 REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT),
778 REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT),
779 /* already went through poll handler */
780 REQ_F_POLLED = BIT(REQ_F_POLLED_BIT),
781 /* buffer already selected */
782 REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT),
783 /* completion is deferred through io_comp_state */
784 REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT),
785 /* caller should reissue async */
786 REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT),
787 /* supports async reads */
788 REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT),
789 /* supports async writes */
790 REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT),
792 REQ_F_ISREG = BIT(REQ_F_ISREG_BIT),
793 /* has creds assigned */
794 REQ_F_CREDS = BIT(REQ_F_CREDS_BIT),
795 /* skip refcounting if not set */
796 REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT),
797 /* there is a linked timeout that has to be armed */
798 REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT),
802 struct io_poll_iocb poll;
803 struct io_poll_iocb *double_poll;
806 typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked);
808 struct io_task_work {
810 struct io_wq_work_node node;
811 struct llist_node fallback_node;
813 io_req_tw_func_t func;
817 IORING_RSRC_FILE = 0,
818 IORING_RSRC_BUFFER = 1,
822 * NOTE! Each of the iocb union members has the file pointer
823 * as the first entry in their struct definition. So you can
824 * access the file pointer through any of the sub-structs,
825 * or directly as just 'ki_filp' in this struct.
831 struct io_poll_iocb poll;
832 struct io_poll_update poll_update;
833 struct io_accept accept;
835 struct io_cancel cancel;
836 struct io_timeout timeout;
837 struct io_timeout_rem timeout_rem;
838 struct io_connect connect;
839 struct io_sr_msg sr_msg;
841 struct io_close close;
842 struct io_rsrc_update rsrc_update;
843 struct io_fadvise fadvise;
844 struct io_madvise madvise;
845 struct io_epoll epoll;
846 struct io_splice splice;
847 struct io_provide_buf pbuf;
848 struct io_statx statx;
849 struct io_shutdown shutdown;
850 struct io_rename rename;
851 struct io_unlink unlink;
852 struct io_mkdir mkdir;
853 struct io_symlink symlink;
854 struct io_hardlink hardlink;
855 /* use only after cleaning per-op data, see io_clean_op() */
856 struct io_completion compl;
859 /* opcode allocated if it needs to store data for async defer */
862 /* polled IO has completed */
868 struct io_ring_ctx *ctx;
871 struct task_struct *task;
874 struct io_kiocb *link;
875 struct percpu_ref *fixed_rsrc_refs;
877 /* used with ctx->iopoll_list with reads/writes */
878 struct list_head inflight_entry;
879 struct io_task_work io_task_work;
880 /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
881 struct hlist_node hash_node;
882 struct async_poll *apoll;
883 struct io_wq_work work;
884 const struct cred *creds;
886 /* store used ubuf, so we can prevent reloading */
887 struct io_mapped_ubuf *imu;
890 struct io_tctx_node {
891 struct list_head ctx_node;
892 struct task_struct *task;
893 struct io_ring_ctx *ctx;
896 struct io_defer_entry {
897 struct list_head list;
898 struct io_kiocb *req;
903 /* needs req->file assigned */
904 unsigned needs_file : 1;
905 /* hash wq insertion if file is a regular file */
906 unsigned hash_reg_file : 1;
907 /* unbound wq insertion if file is a non-regular file */
908 unsigned unbound_nonreg_file : 1;
909 /* opcode is not supported by this kernel */
910 unsigned not_supported : 1;
911 /* set if opcode supports polled "wait" */
913 unsigned pollout : 1;
914 /* op supports buffer selection */
915 unsigned buffer_select : 1;
916 /* do prep async if is going to be punted */
917 unsigned needs_async_setup : 1;
918 /* should block plug */
920 /* size of async data needed, if any */
921 unsigned short async_size;
924 static const struct io_op_def io_op_defs[] = {
925 [IORING_OP_NOP] = {},
926 [IORING_OP_READV] = {
928 .unbound_nonreg_file = 1,
931 .needs_async_setup = 1,
933 .async_size = sizeof(struct io_async_rw),
935 [IORING_OP_WRITEV] = {
938 .unbound_nonreg_file = 1,
940 .needs_async_setup = 1,
942 .async_size = sizeof(struct io_async_rw),
944 [IORING_OP_FSYNC] = {
947 [IORING_OP_READ_FIXED] = {
949 .unbound_nonreg_file = 1,
952 .async_size = sizeof(struct io_async_rw),
954 [IORING_OP_WRITE_FIXED] = {
957 .unbound_nonreg_file = 1,
960 .async_size = sizeof(struct io_async_rw),
962 [IORING_OP_POLL_ADD] = {
964 .unbound_nonreg_file = 1,
966 [IORING_OP_POLL_REMOVE] = {},
967 [IORING_OP_SYNC_FILE_RANGE] = {
970 [IORING_OP_SENDMSG] = {
972 .unbound_nonreg_file = 1,
974 .needs_async_setup = 1,
975 .async_size = sizeof(struct io_async_msghdr),
977 [IORING_OP_RECVMSG] = {
979 .unbound_nonreg_file = 1,
982 .needs_async_setup = 1,
983 .async_size = sizeof(struct io_async_msghdr),
985 [IORING_OP_TIMEOUT] = {
986 .async_size = sizeof(struct io_timeout_data),
988 [IORING_OP_TIMEOUT_REMOVE] = {
989 /* used by timeout updates' prep() */
991 [IORING_OP_ACCEPT] = {
993 .unbound_nonreg_file = 1,
996 [IORING_OP_ASYNC_CANCEL] = {},
997 [IORING_OP_LINK_TIMEOUT] = {
998 .async_size = sizeof(struct io_timeout_data),
1000 [IORING_OP_CONNECT] = {
1002 .unbound_nonreg_file = 1,
1004 .needs_async_setup = 1,
1005 .async_size = sizeof(struct io_async_connect),
1007 [IORING_OP_FALLOCATE] = {
1010 [IORING_OP_OPENAT] = {},
1011 [IORING_OP_CLOSE] = {},
1012 [IORING_OP_FILES_UPDATE] = {},
1013 [IORING_OP_STATX] = {},
1014 [IORING_OP_READ] = {
1016 .unbound_nonreg_file = 1,
1020 .async_size = sizeof(struct io_async_rw),
1022 [IORING_OP_WRITE] = {
1025 .unbound_nonreg_file = 1,
1028 .async_size = sizeof(struct io_async_rw),
1030 [IORING_OP_FADVISE] = {
1033 [IORING_OP_MADVISE] = {},
1034 [IORING_OP_SEND] = {
1036 .unbound_nonreg_file = 1,
1039 [IORING_OP_RECV] = {
1041 .unbound_nonreg_file = 1,
1045 [IORING_OP_OPENAT2] = {
1047 [IORING_OP_EPOLL_CTL] = {
1048 .unbound_nonreg_file = 1,
1050 [IORING_OP_SPLICE] = {
1053 .unbound_nonreg_file = 1,
1055 [IORING_OP_PROVIDE_BUFFERS] = {},
1056 [IORING_OP_REMOVE_BUFFERS] = {},
1060 .unbound_nonreg_file = 1,
1062 [IORING_OP_SHUTDOWN] = {
1065 [IORING_OP_RENAMEAT] = {},
1066 [IORING_OP_UNLINKAT] = {},
1067 [IORING_OP_MKDIRAT] = {},
1068 [IORING_OP_SYMLINKAT] = {},
1069 [IORING_OP_LINKAT] = {},
1072 /* requests with any of those set should undergo io_disarm_next() */
1073 #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL)
1075 static bool io_disarm_next(struct io_kiocb *req);
1076 static void io_uring_del_tctx_node(unsigned long index);
1077 static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
1078 struct task_struct *task,
1080 static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
1082 static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data,
1083 long res, unsigned int cflags);
1084 static void io_put_req(struct io_kiocb *req);
1085 static void io_put_req_deferred(struct io_kiocb *req);
1086 static void io_dismantle_req(struct io_kiocb *req);
1087 static void io_queue_linked_timeout(struct io_kiocb *req);
1088 static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
1089 struct io_uring_rsrc_update2 *up,
1091 static void io_clean_op(struct io_kiocb *req);
1092 static struct file *io_file_get(struct io_ring_ctx *ctx,
1093 struct io_kiocb *req, int fd, bool fixed);
1094 static void __io_queue_sqe(struct io_kiocb *req);
1095 static void io_rsrc_put_work(struct work_struct *work);
1097 static void io_req_task_queue(struct io_kiocb *req);
1098 static void io_submit_flush_completions(struct io_ring_ctx *ctx);
1099 static int io_req_prep_async(struct io_kiocb *req);
1101 static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
1102 unsigned int issue_flags, u32 slot_index);
1103 static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags);
1105 static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer);
1107 static struct kmem_cache *req_cachep;
1109 static const struct file_operations io_uring_fops;
1111 struct sock *io_uring_get_socket(struct file *file)
1113 #if defined(CONFIG_UNIX)
1114 if (file->f_op == &io_uring_fops) {
1115 struct io_ring_ctx *ctx = file->private_data;
1117 return ctx->ring_sock->sk;
1122 EXPORT_SYMBOL(io_uring_get_socket);
1124 static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked)
1127 mutex_lock(&ctx->uring_lock);
1132 #define io_for_each_link(pos, head) \
1133 for (pos = (head); pos; pos = pos->link)
1136 * Shamelessly stolen from the mm implementation of page reference checking,
1137 * see commit f958d7b528b1 for details.
1139 #define req_ref_zero_or_close_to_overflow(req) \
1140 ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u)
1142 static inline bool req_ref_inc_not_zero(struct io_kiocb *req)
1144 WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
1145 return atomic_inc_not_zero(&req->refs);
1148 static inline bool req_ref_put_and_test(struct io_kiocb *req)
1150 if (likely(!(req->flags & REQ_F_REFCOUNT)))
1153 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
1154 return atomic_dec_and_test(&req->refs);
1157 static inline void req_ref_put(struct io_kiocb *req)
1159 WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
1160 WARN_ON_ONCE(req_ref_put_and_test(req));
1163 static inline void req_ref_get(struct io_kiocb *req)
1165 WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT));
1166 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
1167 atomic_inc(&req->refs);
1170 static inline void __io_req_set_refcount(struct io_kiocb *req, int nr)
1172 if (!(req->flags & REQ_F_REFCOUNT)) {
1173 req->flags |= REQ_F_REFCOUNT;
1174 atomic_set(&req->refs, nr);
1178 static inline void io_req_set_refcount(struct io_kiocb *req)
1180 __io_req_set_refcount(req, 1);
1183 static inline void io_req_set_rsrc_node(struct io_kiocb *req)
1185 struct io_ring_ctx *ctx = req->ctx;
1187 if (!req->fixed_rsrc_refs) {
1188 req->fixed_rsrc_refs = &ctx->rsrc_node->refs;
1189 percpu_ref_get(req->fixed_rsrc_refs);
1193 static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl)
1195 bool got = percpu_ref_tryget(ref);
1197 /* already at zero, wait for ->release() */
1199 wait_for_completion(compl);
1200 percpu_ref_resurrect(ref);
1202 percpu_ref_put(ref);
1205 static bool io_match_task(struct io_kiocb *head, struct task_struct *task,
1207 __must_hold(&req->ctx->timeout_lock)
1209 struct io_kiocb *req;
1211 if (task && head->task != task)
1216 io_for_each_link(req, head) {
1217 if (req->flags & REQ_F_INFLIGHT)
1223 static bool io_match_linked(struct io_kiocb *head)
1225 struct io_kiocb *req;
1227 io_for_each_link(req, head) {
1228 if (req->flags & REQ_F_INFLIGHT)
1235 * As io_match_task() but protected against racing with linked timeouts.
1236 * User must not hold timeout_lock.
1238 static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
1243 if (task && head->task != task)
1248 if (head->flags & REQ_F_LINK_TIMEOUT) {
1249 struct io_ring_ctx *ctx = head->ctx;
1251 /* protect against races with linked timeouts */
1252 spin_lock_irq(&ctx->timeout_lock);
1253 matched = io_match_linked(head);
1254 spin_unlock_irq(&ctx->timeout_lock);
1256 matched = io_match_linked(head);
1261 static inline void req_set_fail(struct io_kiocb *req)
1263 req->flags |= REQ_F_FAIL;
1266 static inline void req_fail_link_node(struct io_kiocb *req, int res)
1272 static void io_ring_ctx_ref_free(struct percpu_ref *ref)
1274 struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
1276 complete(&ctx->ref_comp);
1279 static inline bool io_is_timeout_noseq(struct io_kiocb *req)
1281 return !req->timeout.off;
1284 static void io_fallback_req_func(struct work_struct *work)
1286 struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx,
1287 fallback_work.work);
1288 struct llist_node *node = llist_del_all(&ctx->fallback_llist);
1289 struct io_kiocb *req, *tmp;
1290 bool locked = false;
1292 percpu_ref_get(&ctx->refs);
1293 llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node)
1294 req->io_task_work.func(req, &locked);
1297 if (ctx->submit_state.compl_nr)
1298 io_submit_flush_completions(ctx);
1299 mutex_unlock(&ctx->uring_lock);
1301 percpu_ref_put(&ctx->refs);
1305 static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
1307 struct io_ring_ctx *ctx;
1310 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1315 * Use 5 bits less than the max cq entries, that should give us around
1316 * 32 entries per hash list if totally full and uniformly spread.
1318 hash_bits = ilog2(p->cq_entries);
1322 ctx->cancel_hash_bits = hash_bits;
1323 ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head),
1325 if (!ctx->cancel_hash)
1327 __hash_init(ctx->cancel_hash, 1U << hash_bits);
1329 ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL);
1330 if (!ctx->dummy_ubuf)
1332 /* set invalid range, so io_import_fixed() fails meeting it */
1333 ctx->dummy_ubuf->ubuf = -1UL;
1335 if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free,
1336 PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
1339 ctx->flags = p->flags;
1340 init_waitqueue_head(&ctx->sqo_sq_wait);
1341 INIT_LIST_HEAD(&ctx->sqd_list);
1342 init_waitqueue_head(&ctx->poll_wait);
1343 INIT_LIST_HEAD(&ctx->cq_overflow_list);
1344 init_completion(&ctx->ref_comp);
1345 xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1);
1346 xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1);
1347 mutex_init(&ctx->uring_lock);
1348 init_waitqueue_head(&ctx->cq_wait);
1349 spin_lock_init(&ctx->completion_lock);
1350 spin_lock_init(&ctx->timeout_lock);
1351 INIT_LIST_HEAD(&ctx->iopoll_list);
1352 INIT_LIST_HEAD(&ctx->defer_list);
1353 INIT_LIST_HEAD(&ctx->timeout_list);
1354 INIT_LIST_HEAD(&ctx->ltimeout_list);
1355 spin_lock_init(&ctx->rsrc_ref_lock);
1356 INIT_LIST_HEAD(&ctx->rsrc_ref_list);
1357 INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work);
1358 init_llist_head(&ctx->rsrc_put_llist);
1359 INIT_LIST_HEAD(&ctx->tctx_list);
1360 INIT_LIST_HEAD(&ctx->submit_state.free_list);
1361 INIT_LIST_HEAD(&ctx->locked_free_list);
1362 INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func);
1365 kfree(ctx->dummy_ubuf);
1366 kfree(ctx->cancel_hash);
1371 static void io_account_cq_overflow(struct io_ring_ctx *ctx)
1373 struct io_rings *r = ctx->rings;
1375 WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1);
1379 static bool req_need_defer(struct io_kiocb *req, u32 seq)
1381 if (unlikely(req->flags & REQ_F_IO_DRAIN)) {
1382 struct io_ring_ctx *ctx = req->ctx;
1384 return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail;
1390 #define FFS_ASYNC_READ 0x1UL
1391 #define FFS_ASYNC_WRITE 0x2UL
1393 #define FFS_ISREG 0x4UL
1395 #define FFS_ISREG 0x0UL
1397 #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG)
1399 static inline bool io_req_ffs_set(struct io_kiocb *req)
1401 return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE);
1404 static void io_req_track_inflight(struct io_kiocb *req)
1406 if (!(req->flags & REQ_F_INFLIGHT)) {
1407 req->flags |= REQ_F_INFLIGHT;
1408 atomic_inc(¤t->io_uring->inflight_tracked);
1412 static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req)
1414 if (WARN_ON_ONCE(!req->link))
1417 req->flags &= ~REQ_F_ARM_LTIMEOUT;
1418 req->flags |= REQ_F_LINK_TIMEOUT;
1420 /* linked timeouts should have two refs once prep'ed */
1421 io_req_set_refcount(req);
1422 __io_req_set_refcount(req->link, 2);
1426 static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
1428 if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT)))
1430 return __io_prep_linked_timeout(req);
1433 static void io_prep_async_work(struct io_kiocb *req)
1435 const struct io_op_def *def = &io_op_defs[req->opcode];
1436 struct io_ring_ctx *ctx = req->ctx;
1438 if (!(req->flags & REQ_F_CREDS)) {
1439 req->flags |= REQ_F_CREDS;
1440 req->creds = get_current_cred();
1443 req->work.list.next = NULL;
1444 req->work.flags = 0;
1445 if (req->flags & REQ_F_FORCE_ASYNC)
1446 req->work.flags |= IO_WQ_WORK_CONCURRENT;
1448 if (req->flags & REQ_F_ISREG) {
1449 if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
1450 io_wq_hash_work(&req->work, file_inode(req->file));
1451 } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) {
1452 if (def->unbound_nonreg_file)
1453 req->work.flags |= IO_WQ_WORK_UNBOUND;
1456 switch (req->opcode) {
1457 case IORING_OP_SPLICE:
1459 if (!S_ISREG(file_inode(req->splice.file_in)->i_mode))
1460 req->work.flags |= IO_WQ_WORK_UNBOUND;
1465 static void io_prep_async_link(struct io_kiocb *req)
1467 struct io_kiocb *cur;
1469 if (req->flags & REQ_F_LINK_TIMEOUT) {
1470 struct io_ring_ctx *ctx = req->ctx;
1472 spin_lock_irq(&ctx->timeout_lock);
1473 io_for_each_link(cur, req)
1474 io_prep_async_work(cur);
1475 spin_unlock_irq(&ctx->timeout_lock);
1477 io_for_each_link(cur, req)
1478 io_prep_async_work(cur);
1482 static void io_queue_async_work(struct io_kiocb *req, bool *locked)
1484 struct io_ring_ctx *ctx = req->ctx;
1485 struct io_kiocb *link = io_prep_linked_timeout(req);
1486 struct io_uring_task *tctx = req->task->io_uring;
1488 /* must not take the lock, NULL it as a precaution */
1492 BUG_ON(!tctx->io_wq);
1494 /* init ->work of the whole link before punting */
1495 io_prep_async_link(req);
1498 * Not expected to happen, but if we do have a bug where this _can_
1499 * happen, catch it here and ensure the request is marked as
1500 * canceled. That will make io-wq go through the usual work cancel
1501 * procedure rather than attempt to run this request (or create a new
1504 if (WARN_ON_ONCE(!same_thread_group(req->task, current)))
1505 req->work.flags |= IO_WQ_WORK_CANCEL;
1507 trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req,
1508 &req->work, req->flags);
1509 io_wq_enqueue(tctx->io_wq, &req->work);
1511 io_queue_linked_timeout(link);
1514 static void io_kill_timeout(struct io_kiocb *req, int status)
1515 __must_hold(&req->ctx->completion_lock)
1516 __must_hold(&req->ctx->timeout_lock)
1518 struct io_timeout_data *io = req->async_data;
1520 if (hrtimer_try_to_cancel(&io->timer) != -1) {
1523 atomic_set(&req->ctx->cq_timeouts,
1524 atomic_read(&req->ctx->cq_timeouts) + 1);
1525 list_del_init(&req->timeout.list);
1526 io_cqring_fill_event(req->ctx, req->user_data, status, 0);
1527 io_put_req_deferred(req);
1531 static void io_queue_deferred(struct io_ring_ctx *ctx)
1533 while (!list_empty(&ctx->defer_list)) {
1534 struct io_defer_entry *de = list_first_entry(&ctx->defer_list,
1535 struct io_defer_entry, list);
1537 if (req_need_defer(de->req, de->seq))
1539 list_del_init(&de->list);
1540 io_req_task_queue(de->req);
1545 static void io_flush_timeouts(struct io_ring_ctx *ctx)
1546 __must_hold(&ctx->completion_lock)
1548 u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
1550 spin_lock_irq(&ctx->timeout_lock);
1551 while (!list_empty(&ctx->timeout_list)) {
1552 u32 events_needed, events_got;
1553 struct io_kiocb *req = list_first_entry(&ctx->timeout_list,
1554 struct io_kiocb, timeout.list);
1556 if (io_is_timeout_noseq(req))
1560 * Since seq can easily wrap around over time, subtract
1561 * the last seq at which timeouts were flushed before comparing.
1562 * Assuming not more than 2^31-1 events have happened since,
1563 * these subtractions won't have wrapped, so we can check if
1564 * target is in [last_seq, current_seq] by comparing the two.
1566 events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush;
1567 events_got = seq - ctx->cq_last_tm_flush;
1568 if (events_got < events_needed)
1571 list_del_init(&req->timeout.list);
1572 io_kill_timeout(req, 0);
1574 ctx->cq_last_tm_flush = seq;
1575 spin_unlock_irq(&ctx->timeout_lock);
1578 static void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
1580 if (ctx->off_timeout_used)
1581 io_flush_timeouts(ctx);
1582 if (ctx->drain_active)
1583 io_queue_deferred(ctx);
1586 static inline void io_commit_cqring(struct io_ring_ctx *ctx)
1588 if (unlikely(ctx->off_timeout_used || ctx->drain_active))
1589 __io_commit_cqring_flush(ctx);
1590 /* order cqe stores with ring update */
1591 smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
1594 static inline bool io_sqring_full(struct io_ring_ctx *ctx)
1596 struct io_rings *r = ctx->rings;
1598 return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries;
1601 static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx)
1603 return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head);
1606 static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx)
1608 struct io_rings *rings = ctx->rings;
1609 unsigned tail, mask = ctx->cq_entries - 1;
1612 * writes to the cq entry need to come after reading head; the
1613 * control dependency is enough as we're using WRITE_ONCE to
1616 if (__io_cqring_events(ctx) == ctx->cq_entries)
1619 tail = ctx->cached_cq_tail++;
1620 return &rings->cqes[tail & mask];
1623 static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx)
1625 if (likely(!ctx->cq_ev_fd))
1627 if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
1629 return !ctx->eventfd_async || io_wq_current_is_worker();
1633 * This should only get called when at least one event has been posted.
1634 * Some applications rely on the eventfd notification count only changing
1635 * IFF a new CQE has been added to the CQ ring. There's no depedency on
1636 * 1:1 relationship between how many times this function is called (and
1637 * hence the eventfd count) and number of CQEs posted to the CQ ring.
1639 static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
1642 * wake_up_all() may seem excessive, but io_wake_function() and
1643 * io_should_wake() handle the termination of the loop and only
1644 * wake as many waiters as we need to.
1646 if (wq_has_sleeper(&ctx->cq_wait))
1647 wake_up_all(&ctx->cq_wait);
1648 if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait))
1649 wake_up(&ctx->sq_data->wait);
1650 if (io_should_trigger_evfd(ctx))
1651 eventfd_signal(ctx->cq_ev_fd, 1);
1652 if (waitqueue_active(&ctx->poll_wait))
1653 wake_up_interruptible(&ctx->poll_wait);
1656 static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
1658 /* see waitqueue_active() comment */
1661 if (ctx->flags & IORING_SETUP_SQPOLL) {
1662 if (waitqueue_active(&ctx->cq_wait))
1663 wake_up_all(&ctx->cq_wait);
1665 if (io_should_trigger_evfd(ctx))
1666 eventfd_signal(ctx->cq_ev_fd, 1);
1667 if (waitqueue_active(&ctx->poll_wait))
1668 wake_up_interruptible(&ctx->poll_wait);
1671 /* Returns true if there are no backlogged entries after the flush */
1672 static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force)
1674 bool all_flushed, posted;
1676 if (!force && __io_cqring_events(ctx) == ctx->cq_entries)
1680 spin_lock(&ctx->completion_lock);
1681 while (!list_empty(&ctx->cq_overflow_list)) {
1682 struct io_uring_cqe *cqe = io_get_cqe(ctx);
1683 struct io_overflow_cqe *ocqe;
1687 ocqe = list_first_entry(&ctx->cq_overflow_list,
1688 struct io_overflow_cqe, list);
1690 memcpy(cqe, &ocqe->cqe, sizeof(*cqe));
1692 io_account_cq_overflow(ctx);
1695 list_del(&ocqe->list);
1699 all_flushed = list_empty(&ctx->cq_overflow_list);
1701 clear_bit(0, &ctx->check_cq_overflow);
1702 WRITE_ONCE(ctx->rings->sq_flags,
1703 ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW);
1707 io_commit_cqring(ctx);
1708 spin_unlock(&ctx->completion_lock);
1710 io_cqring_ev_posted(ctx);
1714 static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx)
1718 if (test_bit(0, &ctx->check_cq_overflow)) {
1719 /* iopoll syncs against uring_lock, not completion_lock */
1720 if (ctx->flags & IORING_SETUP_IOPOLL)
1721 mutex_lock(&ctx->uring_lock);
1722 ret = __io_cqring_overflow_flush(ctx, false);
1723 if (ctx->flags & IORING_SETUP_IOPOLL)
1724 mutex_unlock(&ctx->uring_lock);
1730 /* must to be called somewhat shortly after putting a request */
1731 static inline void io_put_task(struct task_struct *task, int nr)
1733 struct io_uring_task *tctx = task->io_uring;
1735 if (likely(task == current)) {
1736 tctx->cached_refs += nr;
1738 percpu_counter_sub(&tctx->inflight, nr);
1739 if (unlikely(atomic_read(&tctx->in_idle)))
1740 wake_up(&tctx->wait);
1741 put_task_struct_many(task, nr);
1745 static void io_task_refs_refill(struct io_uring_task *tctx)
1747 unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR;
1749 percpu_counter_add(&tctx->inflight, refill);
1750 refcount_add(refill, ¤t->usage);
1751 tctx->cached_refs += refill;
1754 static inline void io_get_task_refs(int nr)
1756 struct io_uring_task *tctx = current->io_uring;
1758 tctx->cached_refs -= nr;
1759 if (unlikely(tctx->cached_refs < 0))
1760 io_task_refs_refill(tctx);
1763 static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
1764 long res, unsigned int cflags)
1766 struct io_overflow_cqe *ocqe;
1768 ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT);
1771 * If we're in ring overflow flush mode, or in task cancel mode,
1772 * or cannot allocate an overflow entry, then we need to drop it
1775 io_account_cq_overflow(ctx);
1778 if (list_empty(&ctx->cq_overflow_list)) {
1779 set_bit(0, &ctx->check_cq_overflow);
1780 WRITE_ONCE(ctx->rings->sq_flags,
1781 ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW);
1784 ocqe->cqe.user_data = user_data;
1785 ocqe->cqe.res = res;
1786 ocqe->cqe.flags = cflags;
1787 list_add_tail(&ocqe->list, &ctx->cq_overflow_list);
1791 static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data,
1792 long res, unsigned int cflags)
1794 struct io_uring_cqe *cqe;
1796 trace_io_uring_complete(ctx, user_data, res, cflags);
1799 * If we can't get a cq entry, userspace overflowed the
1800 * submission (by quite a lot). Increment the overflow count in
1803 cqe = io_get_cqe(ctx);
1805 WRITE_ONCE(cqe->user_data, user_data);
1806 WRITE_ONCE(cqe->res, res);
1807 WRITE_ONCE(cqe->flags, cflags);
1810 return io_cqring_event_overflow(ctx, user_data, res, cflags);
1813 /* not as hot to bloat with inlining */
1814 static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data,
1815 long res, unsigned int cflags)
1817 return __io_cqring_fill_event(ctx, user_data, res, cflags);
1820 static void io_req_complete_post(struct io_kiocb *req, long res,
1821 unsigned int cflags)
1823 struct io_ring_ctx *ctx = req->ctx;
1825 spin_lock(&ctx->completion_lock);
1826 __io_cqring_fill_event(ctx, req->user_data, res, cflags);
1828 * If we're the last reference to this request, add to our locked
1831 if (req_ref_put_and_test(req)) {
1832 if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
1833 if (req->flags & IO_DISARM_MASK)
1834 io_disarm_next(req);
1836 io_req_task_queue(req->link);
1840 io_dismantle_req(req);
1841 io_put_task(req->task, 1);
1842 list_add(&req->inflight_entry, &ctx->locked_free_list);
1843 ctx->locked_free_nr++;
1845 if (!percpu_ref_tryget(&ctx->refs))
1848 io_commit_cqring(ctx);
1849 spin_unlock(&ctx->completion_lock);
1852 io_cqring_ev_posted(ctx);
1853 percpu_ref_put(&ctx->refs);
1857 static inline bool io_req_needs_clean(struct io_kiocb *req)
1859 return req->flags & IO_REQ_CLEAN_FLAGS;
1862 static void io_req_complete_state(struct io_kiocb *req, long res,
1863 unsigned int cflags)
1865 if (io_req_needs_clean(req))
1868 req->compl.cflags = cflags;
1869 req->flags |= REQ_F_COMPLETE_INLINE;
1872 static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags,
1873 long res, unsigned cflags)
1875 if (issue_flags & IO_URING_F_COMPLETE_DEFER)
1876 io_req_complete_state(req, res, cflags);
1878 io_req_complete_post(req, res, cflags);
1881 static inline void io_req_complete(struct io_kiocb *req, long res)
1883 __io_req_complete(req, 0, res, 0);
1886 static void io_req_complete_failed(struct io_kiocb *req, long res)
1889 io_req_complete_post(req, res, 0);
1892 static void io_req_complete_fail_submit(struct io_kiocb *req)
1895 * We don't submit, fail them all, for that replace hardlinks with
1896 * normal links. Extra REQ_F_LINK is tolerated.
1898 req->flags &= ~REQ_F_HARDLINK;
1899 req->flags |= REQ_F_LINK;
1900 io_req_complete_failed(req, req->result);
1904 * Don't initialise the fields below on every allocation, but do that in
1905 * advance and keep them valid across allocations.
1907 static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx)
1911 req->async_data = NULL;
1912 /* not necessary, but safer to zero */
1916 static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx,
1917 struct io_submit_state *state)
1919 spin_lock(&ctx->completion_lock);
1920 list_splice_init(&ctx->locked_free_list, &state->free_list);
1921 ctx->locked_free_nr = 0;
1922 spin_unlock(&ctx->completion_lock);
1925 /* Returns true IFF there are requests in the cache */
1926 static bool io_flush_cached_reqs(struct io_ring_ctx *ctx)
1928 struct io_submit_state *state = &ctx->submit_state;
1932 * If we have more than a batch's worth of requests in our IRQ side
1933 * locked cache, grab the lock and move them over to our submission
1936 if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH)
1937 io_flush_cached_locked_reqs(ctx, state);
1939 nr = state->free_reqs;
1940 while (!list_empty(&state->free_list)) {
1941 struct io_kiocb *req = list_first_entry(&state->free_list,
1942 struct io_kiocb, inflight_entry);
1944 list_del(&req->inflight_entry);
1945 state->reqs[nr++] = req;
1946 if (nr == ARRAY_SIZE(state->reqs))
1950 state->free_reqs = nr;
1955 * A request might get retired back into the request caches even before opcode
1956 * handlers and io_issue_sqe() are done with it, e.g. inline completion path.
1957 * Because of that, io_alloc_req() should be called only under ->uring_lock
1958 * and with extra caution to not get a request that is still worked on.
1960 static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
1961 __must_hold(&ctx->uring_lock)
1963 struct io_submit_state *state = &ctx->submit_state;
1964 gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
1967 BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH);
1969 if (likely(state->free_reqs || io_flush_cached_reqs(ctx)))
1972 ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH,
1976 * Bulk alloc is all-or-nothing. If we fail to get a batch,
1977 * retry single alloc to be on the safe side.
1979 if (unlikely(ret <= 0)) {
1980 state->reqs[0] = kmem_cache_alloc(req_cachep, gfp);
1981 if (!state->reqs[0])
1986 for (i = 0; i < ret; i++)
1987 io_preinit_req(state->reqs[i], ctx);
1988 state->free_reqs = ret;
1991 return state->reqs[state->free_reqs];
1994 static inline void io_put_file(struct file *file)
2000 static void io_dismantle_req(struct io_kiocb *req)
2002 unsigned int flags = req->flags;
2004 if (io_req_needs_clean(req))
2006 if (!(flags & REQ_F_FIXED_FILE))
2007 io_put_file(req->file);
2008 if (req->fixed_rsrc_refs)
2009 percpu_ref_put(req->fixed_rsrc_refs);
2010 if (req->async_data) {
2011 kfree(req->async_data);
2012 req->async_data = NULL;
2016 static void __io_free_req(struct io_kiocb *req)
2018 struct io_ring_ctx *ctx = req->ctx;
2020 io_dismantle_req(req);
2021 io_put_task(req->task, 1);
2023 spin_lock(&ctx->completion_lock);
2024 list_add(&req->inflight_entry, &ctx->locked_free_list);
2025 ctx->locked_free_nr++;
2026 spin_unlock(&ctx->completion_lock);
2028 percpu_ref_put(&ctx->refs);
2031 static inline void io_remove_next_linked(struct io_kiocb *req)
2033 struct io_kiocb *nxt = req->link;
2035 req->link = nxt->link;
2039 static bool io_kill_linked_timeout(struct io_kiocb *req)
2040 __must_hold(&req->ctx->completion_lock)
2041 __must_hold(&req->ctx->timeout_lock)
2043 struct io_kiocb *link = req->link;
2045 if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
2046 struct io_timeout_data *io = link->async_data;
2048 io_remove_next_linked(req);
2049 link->timeout.head = NULL;
2050 if (hrtimer_try_to_cancel(&io->timer) != -1) {
2051 list_del(&link->timeout.list);
2052 io_cqring_fill_event(link->ctx, link->user_data,
2054 io_put_req_deferred(link);
2061 static void io_fail_links(struct io_kiocb *req)
2062 __must_hold(&req->ctx->completion_lock)
2064 struct io_kiocb *nxt, *link = req->link;
2068 long res = -ECANCELED;
2070 if (link->flags & REQ_F_FAIL)
2076 trace_io_uring_fail_link(req, link);
2077 io_cqring_fill_event(link->ctx, link->user_data, res, 0);
2078 io_put_req_deferred(link);
2083 static bool io_disarm_next(struct io_kiocb *req)
2084 __must_hold(&req->ctx->completion_lock)
2086 bool posted = false;
2088 if (req->flags & REQ_F_ARM_LTIMEOUT) {
2089 struct io_kiocb *link = req->link;
2091 req->flags &= ~REQ_F_ARM_LTIMEOUT;
2092 if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
2093 io_remove_next_linked(req);
2094 io_cqring_fill_event(link->ctx, link->user_data,
2096 io_put_req_deferred(link);
2099 } else if (req->flags & REQ_F_LINK_TIMEOUT) {
2100 struct io_ring_ctx *ctx = req->ctx;
2102 spin_lock_irq(&ctx->timeout_lock);
2103 posted = io_kill_linked_timeout(req);
2104 spin_unlock_irq(&ctx->timeout_lock);
2106 if (unlikely((req->flags & REQ_F_FAIL) &&
2107 !(req->flags & REQ_F_HARDLINK))) {
2108 posted |= (req->link != NULL);
2114 static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
2116 struct io_kiocb *nxt;
2119 * If LINK is set, we have dependent requests in this chain. If we
2120 * didn't fail this request, queue the first one up, moving any other
2121 * dependencies to the next request. In case of failure, fail the rest
2124 if (req->flags & IO_DISARM_MASK) {
2125 struct io_ring_ctx *ctx = req->ctx;
2128 spin_lock(&ctx->completion_lock);
2129 posted = io_disarm_next(req);
2131 io_commit_cqring(req->ctx);
2132 spin_unlock(&ctx->completion_lock);
2134 io_cqring_ev_posted(ctx);
2141 static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req)
2143 if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK))))
2145 return __io_req_find_next(req);
2148 static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked)
2153 if (ctx->submit_state.compl_nr)
2154 io_submit_flush_completions(ctx);
2155 mutex_unlock(&ctx->uring_lock);
2158 percpu_ref_put(&ctx->refs);
2161 static void tctx_task_work(struct callback_head *cb)
2163 bool locked = false;
2164 struct io_ring_ctx *ctx = NULL;
2165 struct io_uring_task *tctx = container_of(cb, struct io_uring_task,
2169 struct io_wq_work_node *node;
2171 if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr)
2172 io_submit_flush_completions(ctx);
2174 spin_lock_irq(&tctx->task_lock);
2175 node = tctx->task_list.first;
2176 INIT_WQ_LIST(&tctx->task_list);
2178 tctx->task_running = false;
2179 spin_unlock_irq(&tctx->task_lock);
2184 struct io_wq_work_node *next = node->next;
2185 struct io_kiocb *req = container_of(node, struct io_kiocb,
2188 if (req->ctx != ctx) {
2189 ctx_flush_and_put(ctx, &locked);
2191 /* if not contended, grab and improve batching */
2192 locked = mutex_trylock(&ctx->uring_lock);
2193 percpu_ref_get(&ctx->refs);
2195 req->io_task_work.func(req, &locked);
2202 ctx_flush_and_put(ctx, &locked);
2205 static void io_req_task_work_add(struct io_kiocb *req)
2207 struct task_struct *tsk = req->task;
2208 struct io_uring_task *tctx = tsk->io_uring;
2209 enum task_work_notify_mode notify;
2210 struct io_wq_work_node *node;
2211 unsigned long flags;
2214 WARN_ON_ONCE(!tctx);
2216 spin_lock_irqsave(&tctx->task_lock, flags);
2217 wq_list_add_tail(&req->io_task_work.node, &tctx->task_list);
2218 running = tctx->task_running;
2220 tctx->task_running = true;
2221 spin_unlock_irqrestore(&tctx->task_lock, flags);
2223 /* task_work already pending, we're done */
2228 * SQPOLL kernel thread doesn't need notification, just a wakeup. For
2229 * all other cases, use TWA_SIGNAL unconditionally to ensure we're
2230 * processing task_work. There's no reliable way to tell if TWA_RESUME
2233 notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL;
2234 if (!task_work_add(tsk, &tctx->task_work, notify)) {
2235 wake_up_process(tsk);
2239 spin_lock_irqsave(&tctx->task_lock, flags);
2240 tctx->task_running = false;
2241 node = tctx->task_list.first;
2242 INIT_WQ_LIST(&tctx->task_list);
2243 spin_unlock_irqrestore(&tctx->task_lock, flags);
2246 req = container_of(node, struct io_kiocb, io_task_work.node);
2248 if (llist_add(&req->io_task_work.fallback_node,
2249 &req->ctx->fallback_llist))
2250 schedule_delayed_work(&req->ctx->fallback_work, 1);
2254 static void io_req_task_cancel(struct io_kiocb *req, bool *locked)
2256 struct io_ring_ctx *ctx = req->ctx;
2258 /* not needed for normal modes, but SQPOLL depends on it */
2259 io_tw_lock(ctx, locked);
2260 io_req_complete_failed(req, req->result);
2263 static void io_req_task_submit(struct io_kiocb *req, bool *locked)
2265 struct io_ring_ctx *ctx = req->ctx;
2267 io_tw_lock(ctx, locked);
2268 /* req->task == current here, checking PF_EXITING is safe */
2269 if (likely(!(req->task->flags & PF_EXITING)))
2270 __io_queue_sqe(req);
2272 io_req_complete_failed(req, -EFAULT);
2275 static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
2278 req->io_task_work.func = io_req_task_cancel;
2279 io_req_task_work_add(req);
2282 static void io_req_task_queue(struct io_kiocb *req)
2284 req->io_task_work.func = io_req_task_submit;
2285 io_req_task_work_add(req);
2288 static void io_req_task_queue_reissue(struct io_kiocb *req)
2290 req->io_task_work.func = io_queue_async_work;
2291 io_req_task_work_add(req);
2294 static inline void io_queue_next(struct io_kiocb *req)
2296 struct io_kiocb *nxt = io_req_find_next(req);
2299 io_req_task_queue(nxt);
2302 static void io_free_req(struct io_kiocb *req)
2308 static void io_free_req_work(struct io_kiocb *req, bool *locked)
2314 struct task_struct *task;
2319 static inline void io_init_req_batch(struct req_batch *rb)
2326 static void io_req_free_batch_finish(struct io_ring_ctx *ctx,
2327 struct req_batch *rb)
2330 percpu_ref_put_many(&ctx->refs, rb->ctx_refs);
2332 io_put_task(rb->task, rb->task_refs);
2335 static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req,
2336 struct io_submit_state *state)
2339 io_dismantle_req(req);
2341 if (req->task != rb->task) {
2343 io_put_task(rb->task, rb->task_refs);
2344 rb->task = req->task;
2350 if (state->free_reqs != ARRAY_SIZE(state->reqs))
2351 state->reqs[state->free_reqs++] = req;
2353 list_add(&req->inflight_entry, &state->free_list);
2356 static void io_submit_flush_completions(struct io_ring_ctx *ctx)
2357 __must_hold(&ctx->uring_lock)
2359 struct io_submit_state *state = &ctx->submit_state;
2360 int i, nr = state->compl_nr;
2361 struct req_batch rb;
2363 spin_lock(&ctx->completion_lock);
2364 for (i = 0; i < nr; i++) {
2365 struct io_kiocb *req = state->compl_reqs[i];
2367 __io_cqring_fill_event(ctx, req->user_data, req->result,
2370 io_commit_cqring(ctx);
2371 spin_unlock(&ctx->completion_lock);
2372 io_cqring_ev_posted(ctx);
2374 io_init_req_batch(&rb);
2375 for (i = 0; i < nr; i++) {
2376 struct io_kiocb *req = state->compl_reqs[i];
2378 if (req_ref_put_and_test(req))
2379 io_req_free_batch(&rb, req, &ctx->submit_state);
2382 io_req_free_batch_finish(ctx, &rb);
2383 state->compl_nr = 0;
2387 * Drop reference to request, return next in chain (if there is one) if this
2388 * was the last reference to this request.
2390 static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req)
2392 struct io_kiocb *nxt = NULL;
2394 if (req_ref_put_and_test(req)) {
2395 nxt = io_req_find_next(req);
2401 static inline void io_put_req(struct io_kiocb *req)
2403 if (req_ref_put_and_test(req))
2407 static inline void io_put_req_deferred(struct io_kiocb *req)
2409 if (req_ref_put_and_test(req)) {
2410 req->io_task_work.func = io_free_req_work;
2411 io_req_task_work_add(req);
2415 static unsigned io_cqring_events(struct io_ring_ctx *ctx)
2417 /* See comment at the top of this file */
2419 return __io_cqring_events(ctx);
2422 static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
2424 struct io_rings *rings = ctx->rings;
2426 /* make sure SQ entry isn't read before tail */
2427 return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
2430 static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf)
2432 unsigned int cflags;
2434 cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;
2435 cflags |= IORING_CQE_F_BUFFER;
2436 req->flags &= ~REQ_F_BUFFER_SELECTED;
2441 static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
2443 struct io_buffer *kbuf;
2445 if (likely(!(req->flags & REQ_F_BUFFER_SELECTED)))
2447 kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
2448 return io_put_kbuf(req, kbuf);
2451 static inline bool io_run_task_work(void)
2453 if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) {
2454 __set_current_state(TASK_RUNNING);
2455 tracehook_notify_signal();
2463 * Find and free completed poll iocbs
2465 static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
2466 struct list_head *done)
2468 struct req_batch rb;
2469 struct io_kiocb *req;
2471 /* order with ->result store in io_complete_rw_iopoll() */
2474 io_init_req_batch(&rb);
2475 while (!list_empty(done)) {
2476 req = list_first_entry(done, struct io_kiocb, inflight_entry);
2477 list_del(&req->inflight_entry);
2479 __io_cqring_fill_event(ctx, req->user_data, req->result,
2480 io_put_rw_kbuf(req));
2483 if (req_ref_put_and_test(req))
2484 io_req_free_batch(&rb, req, &ctx->submit_state);
2487 io_commit_cqring(ctx);
2488 io_cqring_ev_posted_iopoll(ctx);
2489 io_req_free_batch_finish(ctx, &rb);
2492 static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
2495 struct io_kiocb *req, *tmp;
2500 * Only spin for completions if we don't have multiple devices hanging
2501 * off our complete list, and we're under the requested amount.
2503 spin = !ctx->poll_multi_queue && *nr_events < min;
2505 list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) {
2506 struct kiocb *kiocb = &req->rw.kiocb;
2510 * Move completed and retryable entries to our local lists.
2511 * If we find a request that requires polling, break out
2512 * and complete those lists first, if we have entries there.
2514 if (READ_ONCE(req->iopoll_completed)) {
2515 list_move_tail(&req->inflight_entry, &done);
2518 if (!list_empty(&done))
2521 ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin);
2522 if (unlikely(ret < 0))
2527 /* iopoll may have completed current req */
2528 if (READ_ONCE(req->iopoll_completed))
2529 list_move_tail(&req->inflight_entry, &done);
2532 if (!list_empty(&done))
2533 io_iopoll_complete(ctx, nr_events, &done);
2539 * We can't just wait for polled events to come to us, we have to actively
2540 * find and complete them.
2542 static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx)
2544 if (!(ctx->flags & IORING_SETUP_IOPOLL))
2547 mutex_lock(&ctx->uring_lock);
2548 while (!list_empty(&ctx->iopoll_list)) {
2549 unsigned int nr_events = 0;
2551 io_do_iopoll(ctx, &nr_events, 0);
2553 /* let it sleep and repeat later if can't complete a request */
2557 * Ensure we allow local-to-the-cpu processing to take place,
2558 * in this case we need to ensure that we reap all events.
2559 * Also let task_work, etc. to progress by releasing the mutex
2561 if (need_resched()) {
2562 mutex_unlock(&ctx->uring_lock);
2564 mutex_lock(&ctx->uring_lock);
2567 mutex_unlock(&ctx->uring_lock);
2570 static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
2572 unsigned int nr_events = 0;
2576 * We disallow the app entering submit/complete with polling, but we
2577 * still need to lock the ring to prevent racing with polled issue
2578 * that got punted to a workqueue.
2580 mutex_lock(&ctx->uring_lock);
2582 * Don't enter poll loop if we already have events pending.
2583 * If we do, we can potentially be spinning for commands that
2584 * already triggered a CQE (eg in error).
2586 if (test_bit(0, &ctx->check_cq_overflow))
2587 __io_cqring_overflow_flush(ctx, false);
2588 if (io_cqring_events(ctx))
2592 * If a submit got punted to a workqueue, we can have the
2593 * application entering polling for a command before it gets
2594 * issued. That app will hold the uring_lock for the duration
2595 * of the poll right here, so we need to take a breather every
2596 * now and then to ensure that the issue has a chance to add
2597 * the poll to the issued list. Otherwise we can spin here
2598 * forever, while the workqueue is stuck trying to acquire the
2601 if (list_empty(&ctx->iopoll_list)) {
2602 u32 tail = ctx->cached_cq_tail;
2604 mutex_unlock(&ctx->uring_lock);
2606 mutex_lock(&ctx->uring_lock);
2608 /* some requests don't go through iopoll_list */
2609 if (tail != ctx->cached_cq_tail ||
2610 list_empty(&ctx->iopoll_list))
2613 ret = io_do_iopoll(ctx, &nr_events, min);
2614 } while (!ret && nr_events < min && !need_resched());
2616 mutex_unlock(&ctx->uring_lock);
2620 static void kiocb_end_write(struct io_kiocb *req)
2623 * Tell lockdep we inherited freeze protection from submission
2626 if (req->flags & REQ_F_ISREG) {
2627 struct super_block *sb = file_inode(req->file)->i_sb;
2629 __sb_writers_acquired(sb, SB_FREEZE_WRITE);
2635 static bool io_resubmit_prep(struct io_kiocb *req)
2637 struct io_async_rw *rw = req->async_data;
2640 return !io_req_prep_async(req);
2641 iov_iter_restore(&rw->iter, &rw->iter_state);
2645 static bool io_rw_should_reissue(struct io_kiocb *req)
2647 umode_t mode = file_inode(req->file)->i_mode;
2648 struct io_ring_ctx *ctx = req->ctx;
2650 if (!S_ISBLK(mode) && !S_ISREG(mode))
2652 if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() &&
2653 !(ctx->flags & IORING_SETUP_IOPOLL)))
2656 * If ref is dying, we might be running poll reap from the exit work.
2657 * Don't attempt to reissue from that path, just let it fail with
2660 if (percpu_ref_is_dying(&ctx->refs))
2663 * Play it safe and assume not safe to re-import and reissue if we're
2664 * not in the original thread group (or in task context).
2666 if (!same_thread_group(req->task, current) || !in_task())
2671 static bool io_resubmit_prep(struct io_kiocb *req)
2675 static bool io_rw_should_reissue(struct io_kiocb *req)
2681 static bool __io_complete_rw_common(struct io_kiocb *req, long res)
2683 if (req->rw.kiocb.ki_flags & IOCB_WRITE)
2684 kiocb_end_write(req);
2685 if (res != req->result) {
2686 if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
2687 io_rw_should_reissue(req)) {
2688 req->flags |= REQ_F_REISSUE;
2697 static void io_req_task_complete(struct io_kiocb *req, bool *locked)
2699 unsigned int cflags = io_put_rw_kbuf(req);
2700 long res = req->result;
2703 struct io_ring_ctx *ctx = req->ctx;
2704 struct io_submit_state *state = &ctx->submit_state;
2706 io_req_complete_state(req, res, cflags);
2707 state->compl_reqs[state->compl_nr++] = req;
2708 if (state->compl_nr == ARRAY_SIZE(state->compl_reqs))
2709 io_submit_flush_completions(ctx);
2711 io_req_complete_post(req, res, cflags);
2715 static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
2716 unsigned int issue_flags)
2718 if (__io_complete_rw_common(req, res))
2720 __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req));
2723 static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
2725 struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
2727 if (__io_complete_rw_common(req, res))
2730 req->io_task_work.func = io_req_task_complete;
2731 io_req_task_work_add(req);
2734 static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
2736 struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
2738 if (kiocb->ki_flags & IOCB_WRITE)
2739 kiocb_end_write(req);
2740 if (unlikely(res != req->result)) {
2741 if (res == -EAGAIN && io_rw_should_reissue(req)) {
2742 req->flags |= REQ_F_REISSUE;
2747 WRITE_ONCE(req->result, res);
2748 /* order with io_iopoll_complete() checking ->result */
2750 WRITE_ONCE(req->iopoll_completed, 1);
2754 * After the iocb has been issued, it's safe to be found on the poll list.
2755 * Adding the kiocb to the list AFTER submission ensures that we don't
2756 * find it from a io_do_iopoll() thread before the issuer is done
2757 * accessing the kiocb cookie.
2759 static void io_iopoll_req_issued(struct io_kiocb *req)
2761 struct io_ring_ctx *ctx = req->ctx;
2762 const bool in_async = io_wq_current_is_worker();
2764 /* workqueue context doesn't hold uring_lock, grab it now */
2765 if (unlikely(in_async))
2766 mutex_lock(&ctx->uring_lock);
2769 * Track whether we have multiple files in our lists. This will impact
2770 * how we do polling eventually, not spinning if we're on potentially
2771 * different devices.
2773 if (list_empty(&ctx->iopoll_list)) {
2774 ctx->poll_multi_queue = false;
2775 } else if (!ctx->poll_multi_queue) {
2776 struct io_kiocb *list_req;
2777 unsigned int queue_num0, queue_num1;
2779 list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb,
2782 if (list_req->file != req->file) {
2783 ctx->poll_multi_queue = true;
2785 queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie);
2786 queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie);
2787 if (queue_num0 != queue_num1)
2788 ctx->poll_multi_queue = true;
2793 * For fast devices, IO may have already completed. If it has, add
2794 * it to the front so we find it first.
2796 if (READ_ONCE(req->iopoll_completed))
2797 list_add(&req->inflight_entry, &ctx->iopoll_list);
2799 list_add_tail(&req->inflight_entry, &ctx->iopoll_list);
2801 if (unlikely(in_async)) {
2803 * If IORING_SETUP_SQPOLL is enabled, sqes are either handle
2804 * in sq thread task context or in io worker task context. If
2805 * current task context is sq thread, we don't need to check
2806 * whether should wake up sq thread.
2808 if ((ctx->flags & IORING_SETUP_SQPOLL) &&
2809 wq_has_sleeper(&ctx->sq_data->wait))
2810 wake_up(&ctx->sq_data->wait);
2812 mutex_unlock(&ctx->uring_lock);
2816 static bool io_bdev_nowait(struct block_device *bdev)
2818 return !bdev || blk_queue_nowait(bdev_get_queue(bdev));
2822 * If we tracked the file through the SCM inflight mechanism, we could support
2823 * any file. For now, just ensure that anything potentially problematic is done
2826 static bool __io_file_supports_nowait(struct file *file, int rw)
2828 umode_t mode = file_inode(file)->i_mode;
2830 if (S_ISBLK(mode)) {
2831 if (IS_ENABLED(CONFIG_BLOCK) &&
2832 io_bdev_nowait(I_BDEV(file->f_mapping->host)))
2838 if (S_ISREG(mode)) {
2839 if (IS_ENABLED(CONFIG_BLOCK) &&
2840 io_bdev_nowait(file->f_inode->i_sb->s_bdev) &&
2841 file->f_op != &io_uring_fops)
2846 /* any ->read/write should understand O_NONBLOCK */
2847 if (file->f_flags & O_NONBLOCK)
2850 if (!(file->f_mode & FMODE_NOWAIT))
2854 return file->f_op->read_iter != NULL;
2856 return file->f_op->write_iter != NULL;
2859 static bool io_file_supports_nowait(struct io_kiocb *req, int rw)
2861 if (rw == READ && (req->flags & REQ_F_NOWAIT_READ))
2863 else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE))
2866 return __io_file_supports_nowait(req->file, rw);
2869 static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
2872 struct io_ring_ctx *ctx = req->ctx;
2873 struct kiocb *kiocb = &req->rw.kiocb;
2874 struct file *file = req->file;
2878 if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode))
2879 req->flags |= REQ_F_ISREG;
2881 kiocb->ki_pos = READ_ONCE(sqe->off);
2882 if (kiocb->ki_pos == -1) {
2883 if (!(file->f_mode & FMODE_STREAM)) {
2884 req->flags |= REQ_F_CUR_POS;
2885 kiocb->ki_pos = file->f_pos;
2890 kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
2891 kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
2892 ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
2897 * If the file is marked O_NONBLOCK, still allow retry for it if it
2898 * supports async. Otherwise it's impossible to use O_NONBLOCK files
2899 * reliably. If not, or it IOCB_NOWAIT is set, don't retry.
2901 if ((kiocb->ki_flags & IOCB_NOWAIT) ||
2902 ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req, rw)))
2903 req->flags |= REQ_F_NOWAIT;
2905 ioprio = READ_ONCE(sqe->ioprio);
2907 ret = ioprio_check_cap(ioprio);
2911 kiocb->ki_ioprio = ioprio;
2913 kiocb->ki_ioprio = get_current_ioprio();
2915 if (ctx->flags & IORING_SETUP_IOPOLL) {
2916 if (!(kiocb->ki_flags & IOCB_DIRECT) ||
2917 !kiocb->ki_filp->f_op->iopoll)
2920 kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
2921 kiocb->ki_complete = io_complete_rw_iopoll;
2922 req->iopoll_completed = 0;
2924 if (kiocb->ki_flags & IOCB_HIPRI)
2926 kiocb->ki_complete = io_complete_rw;
2929 if (req->opcode == IORING_OP_READ_FIXED ||
2930 req->opcode == IORING_OP_WRITE_FIXED) {
2932 io_req_set_rsrc_node(req);
2935 req->rw.addr = READ_ONCE(sqe->addr);
2936 req->rw.len = READ_ONCE(sqe->len);
2937 req->buf_index = READ_ONCE(sqe->buf_index);
2941 static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
2947 case -ERESTARTNOINTR:
2948 case -ERESTARTNOHAND:
2949 case -ERESTART_RESTARTBLOCK:
2951 * We can't just restart the syscall, since previously
2952 * submitted sqes may already be in progress. Just fail this
2958 kiocb->ki_complete(kiocb, ret, 0);
2962 static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
2963 unsigned int issue_flags)
2965 struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
2966 struct io_async_rw *io = req->async_data;
2968 /* add previously done IO, if any */
2969 if (io && io->bytes_done > 0) {
2971 ret = io->bytes_done;
2973 ret += io->bytes_done;
2976 if (req->flags & REQ_F_CUR_POS)
2977 req->file->f_pos = kiocb->ki_pos;
2978 if (ret >= 0 && (kiocb->ki_complete == io_complete_rw))
2979 __io_complete_rw(req, ret, 0, issue_flags);
2981 io_rw_done(kiocb, ret);
2983 if (req->flags & REQ_F_REISSUE) {
2984 req->flags &= ~REQ_F_REISSUE;
2985 if (io_resubmit_prep(req)) {
2986 io_req_task_queue_reissue(req);
2988 unsigned int cflags = io_put_rw_kbuf(req);
2989 struct io_ring_ctx *ctx = req->ctx;
2992 if (!(issue_flags & IO_URING_F_NONBLOCK)) {
2993 mutex_lock(&ctx->uring_lock);
2994 __io_req_complete(req, issue_flags, ret, cflags);
2995 mutex_unlock(&ctx->uring_lock);
2997 __io_req_complete(req, issue_flags, ret, cflags);
3003 static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter,
3004 struct io_mapped_ubuf *imu)
3006 size_t len = req->rw.len;
3007 u64 buf_end, buf_addr = req->rw.addr;
3010 if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
3012 /* not inside the mapped region */
3013 if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end))
3017 * May not be a start of buffer, set size appropriately
3018 * and advance us to the beginning.
3020 offset = buf_addr - imu->ubuf;
3021 iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len);
3025 * Don't use iov_iter_advance() here, as it's really slow for
3026 * using the latter parts of a big fixed buffer - it iterates
3027 * over each segment manually. We can cheat a bit here, because
3030 * 1) it's a BVEC iter, we set it up
3031 * 2) all bvecs are PAGE_SIZE in size, except potentially the
3032 * first and last bvec
3034 * So just find our index, and adjust the iterator afterwards.
3035 * If the offset is within the first bvec (or the whole first
3036 * bvec, just use iov_iter_advance(). This makes it easier
3037 * since we can just skip the first segment, which may not
3038 * be PAGE_SIZE aligned.
3040 const struct bio_vec *bvec = imu->bvec;
3042 if (offset <= bvec->bv_len) {
3043 iov_iter_advance(iter, offset);
3045 unsigned long seg_skip;
3047 /* skip first vec */
3048 offset -= bvec->bv_len;
3049 seg_skip = 1 + (offset >> PAGE_SHIFT);
3051 iter->bvec = bvec + seg_skip;
3052 iter->nr_segs -= seg_skip;
3053 iter->count -= bvec->bv_len + offset;
3054 iter->iov_offset = offset & ~PAGE_MASK;
3061 static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
3063 struct io_ring_ctx *ctx = req->ctx;
3064 struct io_mapped_ubuf *imu = req->imu;
3065 u16 index, buf_index = req->buf_index;
3068 if (unlikely(buf_index >= ctx->nr_user_bufs))
3070 index = array_index_nospec(buf_index, ctx->nr_user_bufs);
3071 imu = READ_ONCE(ctx->user_bufs[index]);
3074 return __io_import_fixed(req, rw, iter, imu);
3077 static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock)
3080 mutex_unlock(&ctx->uring_lock);
3083 static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock)
3086 * "Normal" inline submissions always hold the uring_lock, since we
3087 * grab it from the system call. Same is true for the SQPOLL offload.
3088 * The only exception is when we've detached the request and issue it
3089 * from an async worker thread, grab the lock for that case.
3092 mutex_lock(&ctx->uring_lock);
3095 static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len,
3096 int bgid, struct io_buffer *kbuf,
3099 struct io_buffer *head;
3101 if (req->flags & REQ_F_BUFFER_SELECTED)
3104 io_ring_submit_lock(req->ctx, needs_lock);
3106 lockdep_assert_held(&req->ctx->uring_lock);
3108 head = xa_load(&req->ctx->io_buffers, bgid);
3110 if (!list_empty(&head->list)) {
3111 kbuf = list_last_entry(&head->list, struct io_buffer,
3113 list_del(&kbuf->list);
3116 xa_erase(&req->ctx->io_buffers, bgid);
3118 if (*len > kbuf->len)
3121 kbuf = ERR_PTR(-ENOBUFS);
3124 io_ring_submit_unlock(req->ctx, needs_lock);
3129 static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len,
3132 struct io_buffer *kbuf;
3135 kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
3136 bgid = req->buf_index;
3137 kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock);
3140 req->rw.addr = (u64) (unsigned long) kbuf;
3141 req->flags |= REQ_F_BUFFER_SELECTED;
3142 return u64_to_user_ptr(kbuf->addr);
3145 #ifdef CONFIG_COMPAT
3146 static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov,
3149 struct compat_iovec __user *uiov;
3150 compat_ssize_t clen;
3154 uiov = u64_to_user_ptr(req->rw.addr);
3155 if (!access_ok(uiov, sizeof(*uiov)))
3157 if (__get_user(clen, &uiov->iov_len))
3163 buf = io_rw_buffer_select(req, &len, needs_lock);
3165 return PTR_ERR(buf);
3166 iov[0].iov_base = buf;
3167 iov[0].iov_len = (compat_size_t) len;
3172 static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
3175 struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr);
3179 if (copy_from_user(iov, uiov, sizeof(*uiov)))
3182 len = iov[0].iov_len;
3185 buf = io_rw_buffer_select(req, &len, needs_lock);
3187 return PTR_ERR(buf);
3188 iov[0].iov_base = buf;
3189 iov[0].iov_len = len;
3193 static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
3196 if (req->flags & REQ_F_BUFFER_SELECTED) {
3197 struct io_buffer *kbuf;
3199 kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
3200 iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
3201 iov[0].iov_len = kbuf->len;
3204 if (req->rw.len != 1)
3207 #ifdef CONFIG_COMPAT
3208 if (req->ctx->compat)
3209 return io_compat_import(req, iov, needs_lock);
3212 return __io_iov_buffer_select(req, iov, needs_lock);
3215 static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec,
3216 struct iov_iter *iter, bool needs_lock)
3218 void __user *buf = u64_to_user_ptr(req->rw.addr);
3219 size_t sqe_len = req->rw.len;
3220 u8 opcode = req->opcode;
3223 if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) {
3225 return io_import_fixed(req, rw, iter);
3228 /* buffer index only valid with fixed read/write, or buffer select */
3229 if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))
3232 if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) {
3233 if (req->flags & REQ_F_BUFFER_SELECT) {
3234 buf = io_rw_buffer_select(req, &sqe_len, needs_lock);
3236 return PTR_ERR(buf);
3237 req->rw.len = sqe_len;
3240 ret = import_single_range(rw, buf, sqe_len, *iovec, iter);
3245 if (req->flags & REQ_F_BUFFER_SELECT) {
3246 ret = io_iov_buffer_select(req, *iovec, needs_lock);
3248 iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len);
3253 return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter,
3257 static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb)
3259 return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos;
3263 * For files that don't have ->read_iter() and ->write_iter(), handle them
3264 * by looping over ->read() or ->write() manually.
3266 static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter)
3268 struct kiocb *kiocb = &req->rw.kiocb;
3269 struct file *file = req->file;
3273 * Don't support polled IO through this interface, and we can't
3274 * support non-blocking either. For the latter, this just causes
3275 * the kiocb to be handled from an async context.
3277 if (kiocb->ki_flags & IOCB_HIPRI)
3279 if (kiocb->ki_flags & IOCB_NOWAIT)
3282 while (iov_iter_count(iter)) {
3286 if (!iov_iter_is_bvec(iter)) {
3287 iovec = iov_iter_iovec(iter);
3289 iovec.iov_base = u64_to_user_ptr(req->rw.addr);
3290 iovec.iov_len = req->rw.len;
3294 nr = file->f_op->read(file, iovec.iov_base,
3295 iovec.iov_len, io_kiocb_ppos(kiocb));
3297 nr = file->f_op->write(file, iovec.iov_base,
3298 iovec.iov_len, io_kiocb_ppos(kiocb));
3306 if (!iov_iter_is_bvec(iter)) {
3307 iov_iter_advance(iter, nr);
3313 if (nr != iovec.iov_len)
3320 static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
3321 const struct iovec *fast_iov, struct iov_iter *iter)
3323 struct io_async_rw *rw = req->async_data;
3325 memcpy(&rw->iter, iter, sizeof(*iter));
3326 rw->free_iovec = iovec;
3328 /* can only be fixed buffers, no need to do anything */
3329 if (iov_iter_is_bvec(iter))
3332 unsigned iov_off = 0;
3334 rw->iter.iov = rw->fast_iov;
3335 if (iter->iov != fast_iov) {
3336 iov_off = iter->iov - fast_iov;
3337 rw->iter.iov += iov_off;
3339 if (rw->fast_iov != fast_iov)
3340 memcpy(rw->fast_iov + iov_off, fast_iov + iov_off,
3341 sizeof(struct iovec) * iter->nr_segs);
3343 req->flags |= REQ_F_NEED_CLEANUP;
3347 static inline int io_alloc_async_data(struct io_kiocb *req)
3349 WARN_ON_ONCE(!io_op_defs[req->opcode].async_size);
3350 req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL);
3351 return req->async_data == NULL;
3354 static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
3355 const struct iovec *fast_iov,
3356 struct iov_iter *iter, bool force)
3358 if (!force && !io_op_defs[req->opcode].needs_async_setup)
3360 if (!req->async_data) {
3361 struct io_async_rw *iorw;
3363 if (io_alloc_async_data(req)) {
3368 io_req_map_rw(req, iovec, fast_iov, iter);
3369 iorw = req->async_data;
3370 /* we've copied and mapped the iter, ensure state is saved */
3371 iov_iter_save_state(&iorw->iter, &iorw->iter_state);
3376 static inline int io_rw_prep_async(struct io_kiocb *req, int rw)
3378 struct io_async_rw *iorw = req->async_data;
3379 struct iovec *iov = iorw->fast_iov;
3382 ret = io_import_iovec(rw, req, &iov, &iorw->iter, false);
3383 if (unlikely(ret < 0))
3386 iorw->bytes_done = 0;
3387 iorw->free_iovec = iov;
3389 req->flags |= REQ_F_NEED_CLEANUP;
3390 iov_iter_save_state(&iorw->iter, &iorw->iter_state);
3394 static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
3396 if (unlikely(!(req->file->f_mode & FMODE_READ)))
3398 return io_prep_rw(req, sqe, READ);
3402 * This is our waitqueue callback handler, registered through lock_page_async()
3403 * when we initially tried to do the IO with the iocb armed our waitqueue.
3404 * This gets called when the page is unlocked, and we generally expect that to
3405 * happen when the page IO is completed and the page is now uptodate. This will
3406 * queue a task_work based retry of the operation, attempting to copy the data
3407 * again. If the latter fails because the page was NOT uptodate, then we will
3408 * do a thread based blocking retry of the operation. That's the unexpected
3411 static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
3412 int sync, void *arg)
3414 struct wait_page_queue *wpq;
3415 struct io_kiocb *req = wait->private;
3416 struct wait_page_key *key = arg;
3418 wpq = container_of(wait, struct wait_page_queue, wait);
3420 if (!wake_page_match(wpq, key))
3423 req->rw.kiocb.ki_flags &= ~IOCB_WAITQ;
3424 list_del_init(&wait->entry);
3425 io_req_task_queue(req);
3430 * This controls whether a given IO request should be armed for async page
3431 * based retry. If we return false here, the request is handed to the async
3432 * worker threads for retry. If we're doing buffered reads on a regular file,
3433 * we prepare a private wait_page_queue entry and retry the operation. This
3434 * will either succeed because the page is now uptodate and unlocked, or it
3435 * will register a callback when the page is unlocked at IO completion. Through
3436 * that callback, io_uring uses task_work to setup a retry of the operation.
3437 * That retry will attempt the buffered read again. The retry will generally
3438 * succeed, or in rare cases where it fails, we then fall back to using the
3439 * async worker threads for a blocking retry.
3441 static bool io_rw_should_retry(struct io_kiocb *req)
3443 struct io_async_rw *rw = req->async_data;
3444 struct wait_page_queue *wait = &rw->wpq;
3445 struct kiocb *kiocb = &req->rw.kiocb;
3447 /* never retry for NOWAIT, we just complete with -EAGAIN */
3448 if (req->flags & REQ_F_NOWAIT)
3451 /* Only for buffered IO */
3452 if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI))
3456 * just use poll if we can, and don't attempt if the fs doesn't
3457 * support callback based unlocks
3459 if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC))
3462 wait->wait.func = io_async_buf_func;
3463 wait->wait.private = req;
3464 wait->wait.flags = 0;
3465 INIT_LIST_HEAD(&wait->wait.entry);
3466 kiocb->ki_flags |= IOCB_WAITQ;
3467 kiocb->ki_flags &= ~IOCB_NOWAIT;
3468 kiocb->ki_waitq = wait;
3472 static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter)
3474 if (req->file->f_op->read_iter)
3475 return call_read_iter(req->file, &req->rw.kiocb, iter);
3476 else if (req->file->f_op->read)
3477 return loop_rw_iter(READ, req, iter);
3482 static bool need_read_all(struct io_kiocb *req)
3484 return req->flags & REQ_F_ISREG ||
3485 S_ISBLK(file_inode(req->file)->i_mode);
3488 static int io_read(struct io_kiocb *req, unsigned int issue_flags)
3490 struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
3491 struct kiocb *kiocb = &req->rw.kiocb;
3492 struct iov_iter __iter, *iter = &__iter;
3493 struct io_async_rw *rw = req->async_data;
3494 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
3495 struct iov_iter_state __state, *state;
3500 state = &rw->iter_state;
3502 * We come here from an earlier attempt, restore our state to
3503 * match in case it doesn't. It's cheap enough that we don't
3504 * need to make this conditional.
3506 iov_iter_restore(iter, state);
3509 ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);
3513 iov_iter_save_state(iter, state);
3515 req->result = iov_iter_count(iter);
3517 /* Ensure we clear previously set non-block flag */
3518 if (!force_nonblock)
3519 kiocb->ki_flags &= ~IOCB_NOWAIT;
3521 kiocb->ki_flags |= IOCB_NOWAIT;
3523 /* If the file doesn't support async, just async punt */
3524 if (force_nonblock && !io_file_supports_nowait(req, READ)) {
3525 ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
3526 return ret ?: -EAGAIN;
3529 ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result);
3530 if (unlikely(ret)) {
3535 ret = io_iter_do_read(req, iter);
3537 if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) {
3538 req->flags &= ~REQ_F_REISSUE;
3539 /* IOPOLL retry should happen for io-wq threads */
3540 if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))
3542 /* no retry on NONBLOCK nor RWF_NOWAIT */
3543 if (req->flags & REQ_F_NOWAIT)
3546 } else if (ret == -EIOCBQUEUED) {
3548 } else if (ret <= 0 || ret == req->result || !force_nonblock ||
3549 (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) {
3550 /* read all, failed, already did sync or don't want to retry */
3555 * Don't depend on the iter state matching what was consumed, or being
3556 * untouched in case of error. Restore it and we'll advance it
3557 * manually if we need to.
3559 iov_iter_restore(iter, state);
3561 ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
3566 rw = req->async_data;
3568 * Now use our persistent iterator and state, if we aren't already.
3569 * We've restored and mapped the iter to match.
3571 if (iter != &rw->iter) {
3573 state = &rw->iter_state;
3578 * We end up here because of a partial read, either from
3579 * above or inside this loop. Advance the iter by the bytes
3580 * that were consumed.
3582 iov_iter_advance(iter, ret);
3583 if (!iov_iter_count(iter))
3585 rw->bytes_done += ret;
3586 iov_iter_save_state(iter, state);
3588 /* if we can retry, do so with the callbacks armed */
3589 if (!io_rw_should_retry(req)) {
3590 kiocb->ki_flags &= ~IOCB_WAITQ;
3595 * Now retry read with the IOCB_WAITQ parts set in the iocb. If
3596 * we get -EIOCBQUEUED, then we'll get a notification when the
3597 * desired page gets unlocked. We can also get a partial read
3598 * here, and if we do, then just retry at the new offset.
3600 ret = io_iter_do_read(req, iter);
3601 if (ret == -EIOCBQUEUED)
3603 /* we got some bytes, but not all. retry. */
3604 kiocb->ki_flags &= ~IOCB_WAITQ;
3605 iov_iter_restore(iter, state);
3608 kiocb_done(kiocb, ret, issue_flags);
3610 /* it's faster to check here then delegate to kfree */
3616 static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
3618 if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
3620 return io_prep_rw(req, sqe, WRITE);
3623 static int io_write(struct io_kiocb *req, unsigned int issue_flags)
3625 struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
3626 struct kiocb *kiocb = &req->rw.kiocb;
3627 struct iov_iter __iter, *iter = &__iter;
3628 struct io_async_rw *rw = req->async_data;
3629 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
3630 struct iov_iter_state __state, *state;
3635 state = &rw->iter_state;
3636 iov_iter_restore(iter, state);
3639 ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);
3643 iov_iter_save_state(iter, state);
3645 req->result = iov_iter_count(iter);
3647 /* Ensure we clear previously set non-block flag */
3648 if (!force_nonblock)
3649 kiocb->ki_flags &= ~IOCB_NOWAIT;
3651 kiocb->ki_flags |= IOCB_NOWAIT;
3653 /* If the file doesn't support async, just async punt */
3654 if (force_nonblock && !io_file_supports_nowait(req, WRITE))
3657 /* file path doesn't support NOWAIT for non-direct_IO */
3658 if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) &&
3659 (req->flags & REQ_F_ISREG))
3662 ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result);
3667 * Open-code file_start_write here to grab freeze protection,
3668 * which will be released by another thread in
3669 * io_complete_rw(). Fool lockdep by telling it the lock got
3670 * released so that it doesn't complain about the held lock when
3671 * we return to userspace.
3673 if (req->flags & REQ_F_ISREG) {
3674 sb_start_write(file_inode(req->file)->i_sb);
3675 __sb_writers_release(file_inode(req->file)->i_sb,
3678 kiocb->ki_flags |= IOCB_WRITE;
3680 if (req->file->f_op->write_iter)
3681 ret2 = call_write_iter(req->file, kiocb, iter);
3682 else if (req->file->f_op->write)
3683 ret2 = loop_rw_iter(WRITE, req, iter);
3687 if (req->flags & REQ_F_REISSUE) {
3688 req->flags &= ~REQ_F_REISSUE;
3693 * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just
3694 * retry them without IOCB_NOWAIT.
3696 if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT))
3698 /* no retry on NONBLOCK nor RWF_NOWAIT */
3699 if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT))
3701 if (!force_nonblock || ret2 != -EAGAIN) {
3702 /* IOPOLL retry should happen for io-wq threads */
3703 if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN)
3706 kiocb_done(kiocb, ret2, issue_flags);
3709 iov_iter_restore(iter, state);
3710 ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
3711 return ret ?: -EAGAIN;
3714 /* it's reportedly faster than delegating the null check to kfree() */
3720 static int io_renameat_prep(struct io_kiocb *req,
3721 const struct io_uring_sqe *sqe)
3723 struct io_rename *ren = &req->rename;
3724 const char __user *oldf, *newf;
3726 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3728 if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
3730 if (unlikely(req->flags & REQ_F_FIXED_FILE))
3733 ren->old_dfd = READ_ONCE(sqe->fd);
3734 oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
3735 newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
3736 ren->new_dfd = READ_ONCE(sqe->len);
3737 ren->flags = READ_ONCE(sqe->rename_flags);
3739 ren->oldpath = getname(oldf);
3740 if (IS_ERR(ren->oldpath))
3741 return PTR_ERR(ren->oldpath);
3743 ren->newpath = getname(newf);
3744 if (IS_ERR(ren->newpath)) {
3745 putname(ren->oldpath);
3746 return PTR_ERR(ren->newpath);
3749 req->flags |= REQ_F_NEED_CLEANUP;
3753 static int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
3755 struct io_rename *ren = &req->rename;
3758 if (issue_flags & IO_URING_F_NONBLOCK)
3761 ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
3762 ren->newpath, ren->flags);
3764 req->flags &= ~REQ_F_NEED_CLEANUP;
3767 io_req_complete(req, ret);
3771 static int io_unlinkat_prep(struct io_kiocb *req,
3772 const struct io_uring_sqe *sqe)
3774 struct io_unlink *un = &req->unlink;
3775 const char __user *fname;
3777 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3779 if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index ||
3782 if (unlikely(req->flags & REQ_F_FIXED_FILE))
3785 un->dfd = READ_ONCE(sqe->fd);
3787 un->flags = READ_ONCE(sqe->unlink_flags);
3788 if (un->flags & ~AT_REMOVEDIR)
3791 fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
3792 un->filename = getname(fname);
3793 if (IS_ERR(un->filename))
3794 return PTR_ERR(un->filename);
3796 req->flags |= REQ_F_NEED_CLEANUP;
3800 static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
3802 struct io_unlink *un = &req->unlink;
3805 if (issue_flags & IO_URING_F_NONBLOCK)
3808 if (un->flags & AT_REMOVEDIR)
3809 ret = do_rmdir(un->dfd, un->filename);
3811 ret = do_unlinkat(un->dfd, un->filename);
3813 req->flags &= ~REQ_F_NEED_CLEANUP;
3816 io_req_complete(req, ret);
3820 static int io_mkdirat_prep(struct io_kiocb *req,
3821 const struct io_uring_sqe *sqe)
3823 struct io_mkdir *mkd = &req->mkdir;
3824 const char __user *fname;
3826 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3828 if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index ||
3831 if (unlikely(req->flags & REQ_F_FIXED_FILE))
3834 mkd->dfd = READ_ONCE(sqe->fd);
3835 mkd->mode = READ_ONCE(sqe->len);
3837 fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
3838 mkd->filename = getname(fname);
3839 if (IS_ERR(mkd->filename))
3840 return PTR_ERR(mkd->filename);
3842 req->flags |= REQ_F_NEED_CLEANUP;
3846 static int io_mkdirat(struct io_kiocb *req, int issue_flags)
3848 struct io_mkdir *mkd = &req->mkdir;
3851 if (issue_flags & IO_URING_F_NONBLOCK)
3854 ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
3856 req->flags &= ~REQ_F_NEED_CLEANUP;
3859 io_req_complete(req, ret);
3863 static int io_symlinkat_prep(struct io_kiocb *req,
3864 const struct io_uring_sqe *sqe)
3866 struct io_symlink *sl = &req->symlink;
3867 const char __user *oldpath, *newpath;
3869 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3871 if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index ||
3874 if (unlikely(req->flags & REQ_F_FIXED_FILE))
3877 sl->new_dfd = READ_ONCE(sqe->fd);
3878 oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
3879 newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
3881 sl->oldpath = getname(oldpath);
3882 if (IS_ERR(sl->oldpath))
3883 return PTR_ERR(sl->oldpath);
3885 sl->newpath = getname(newpath);
3886 if (IS_ERR(sl->newpath)) {
3887 putname(sl->oldpath);
3888 return PTR_ERR(sl->newpath);
3891 req->flags |= REQ_F_NEED_CLEANUP;
3895 static int io_symlinkat(struct io_kiocb *req, int issue_flags)
3897 struct io_symlink *sl = &req->symlink;
3900 if (issue_flags & IO_URING_F_NONBLOCK)
3903 ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
3905 req->flags &= ~REQ_F_NEED_CLEANUP;
3908 io_req_complete(req, ret);
3912 static int io_linkat_prep(struct io_kiocb *req,
3913 const struct io_uring_sqe *sqe)
3915 struct io_hardlink *lnk = &req->hardlink;
3916 const char __user *oldf, *newf;
3918 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3920 if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
3922 if (unlikely(req->flags & REQ_F_FIXED_FILE))
3925 lnk->old_dfd = READ_ONCE(sqe->fd);
3926 lnk->new_dfd = READ_ONCE(sqe->len);
3927 oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
3928 newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
3929 lnk->flags = READ_ONCE(sqe->hardlink_flags);
3931 lnk->oldpath = getname(oldf);
3932 if (IS_ERR(lnk->oldpath))
3933 return PTR_ERR(lnk->oldpath);
3935 lnk->newpath = getname(newf);
3936 if (IS_ERR(lnk->newpath)) {
3937 putname(lnk->oldpath);
3938 return PTR_ERR(lnk->newpath);
3941 req->flags |= REQ_F_NEED_CLEANUP;
3945 static int io_linkat(struct io_kiocb *req, int issue_flags)
3947 struct io_hardlink *lnk = &req->hardlink;
3950 if (issue_flags & IO_URING_F_NONBLOCK)
3953 ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
3954 lnk->newpath, lnk->flags);
3956 req->flags &= ~REQ_F_NEED_CLEANUP;
3959 io_req_complete(req, ret);
3963 static int io_shutdown_prep(struct io_kiocb *req,
3964 const struct io_uring_sqe *sqe)
3966 #if defined(CONFIG_NET)
3967 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
3969 if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags ||
3970 sqe->buf_index || sqe->splice_fd_in))
3973 req->shutdown.how = READ_ONCE(sqe->len);
3980 static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
3982 #if defined(CONFIG_NET)
3983 struct socket *sock;
3986 if (issue_flags & IO_URING_F_NONBLOCK)
3989 sock = sock_from_file(req->file);
3990 if (unlikely(!sock))
3993 ret = __sys_shutdown_sock(sock, req->shutdown.how);
3996 io_req_complete(req, ret);
4003 static int __io_splice_prep(struct io_kiocb *req,
4004 const struct io_uring_sqe *sqe)
4006 struct io_splice *sp = &req->splice;
4007 unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
4009 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4013 sp->len = READ_ONCE(sqe->len);
4014 sp->flags = READ_ONCE(sqe->splice_flags);
4016 if (unlikely(sp->flags & ~valid_flags))
4019 sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in),
4020 (sp->flags & SPLICE_F_FD_IN_FIXED));
4023 req->flags |= REQ_F_NEED_CLEANUP;
4027 static int io_tee_prep(struct io_kiocb *req,
4028 const struct io_uring_sqe *sqe)
4030 if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
4032 return __io_splice_prep(req, sqe);
4035 static int io_tee(struct io_kiocb *req, unsigned int issue_flags)
4037 struct io_splice *sp = &req->splice;
4038 struct file *in = sp->file_in;
4039 struct file *out = sp->file_out;
4040 unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
4043 if (issue_flags & IO_URING_F_NONBLOCK)
4046 ret = do_tee(in, out, sp->len, flags);
4048 if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
4050 req->flags &= ~REQ_F_NEED_CLEANUP;
4054 io_req_complete(req, ret);
4058 static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4060 struct io_splice *sp = &req->splice;
4062 sp->off_in = READ_ONCE(sqe->splice_off_in);
4063 sp->off_out = READ_ONCE(sqe->off);
4064 return __io_splice_prep(req, sqe);
4067 static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
4069 struct io_splice *sp = &req->splice;
4070 struct file *in = sp->file_in;
4071 struct file *out = sp->file_out;
4072 unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
4073 loff_t *poff_in, *poff_out;
4076 if (issue_flags & IO_URING_F_NONBLOCK)
4079 poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
4080 poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
4083 ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
4085 if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
4087 req->flags &= ~REQ_F_NEED_CLEANUP;
4091 io_req_complete(req, ret);
4096 * IORING_OP_NOP just posts a completion event, nothing else.
4098 static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
4100 struct io_ring_ctx *ctx = req->ctx;
4102 if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
4105 __io_req_complete(req, issue_flags, 0, 0);
4109 static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4111 struct io_ring_ctx *ctx = req->ctx;
4116 if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
4118 if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
4122 req->sync.flags = READ_ONCE(sqe->fsync_flags);
4123 if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC))
4126 req->sync.off = READ_ONCE(sqe->off);
4127 req->sync.len = READ_ONCE(sqe->len);
4131 static int io_fsync(struct io_kiocb *req, unsigned int issue_flags)
4133 loff_t end = req->sync.off + req->sync.len;
4136 /* fsync always requires a blocking context */
4137 if (issue_flags & IO_URING_F_NONBLOCK)
4140 ret = vfs_fsync_range(req->file, req->sync.off,
4141 end > 0 ? end : LLONG_MAX,
4142 req->sync.flags & IORING_FSYNC_DATASYNC);
4145 io_req_complete(req, ret);
4149 static int io_fallocate_prep(struct io_kiocb *req,
4150 const struct io_uring_sqe *sqe)
4152 if (sqe->ioprio || sqe->buf_index || sqe->rw_flags ||
4155 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4158 req->sync.off = READ_ONCE(sqe->off);
4159 req->sync.len = READ_ONCE(sqe->addr);
4160 req->sync.mode = READ_ONCE(sqe->len);
4164 static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags)
4168 /* fallocate always requiring blocking context */
4169 if (issue_flags & IO_URING_F_NONBLOCK)
4171 ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off,
4175 io_req_complete(req, ret);
4179 static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4181 const char __user *fname;
4184 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4186 if (unlikely(sqe->ioprio || sqe->buf_index))
4188 if (unlikely(req->flags & REQ_F_FIXED_FILE))
4191 /* open.how should be already initialised */
4192 if (!(req->open.how.flags & O_PATH) && force_o_largefile())
4193 req->open.how.flags |= O_LARGEFILE;
4195 req->open.dfd = READ_ONCE(sqe->fd);
4196 fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
4197 req->open.filename = getname(fname);
4198 if (IS_ERR(req->open.filename)) {
4199 ret = PTR_ERR(req->open.filename);
4200 req->open.filename = NULL;
4204 req->open.file_slot = READ_ONCE(sqe->file_index);
4205 if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC))
4208 req->open.nofile = rlimit(RLIMIT_NOFILE);
4209 req->flags |= REQ_F_NEED_CLEANUP;
4213 static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4215 u64 mode = READ_ONCE(sqe->len);
4216 u64 flags = READ_ONCE(sqe->open_flags);
4218 req->open.how = build_open_how(flags, mode);
4219 return __io_openat_prep(req, sqe);
4222 static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4224 struct open_how __user *how;
4228 how = u64_to_user_ptr(READ_ONCE(sqe->addr2));
4229 len = READ_ONCE(sqe->len);
4230 if (len < OPEN_HOW_SIZE_VER0)
4233 ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how,
4238 return __io_openat_prep(req, sqe);
4241 static int io_openat2(struct io_kiocb *req, unsigned int issue_flags)
4243 struct open_flags op;
4245 bool resolve_nonblock, nonblock_set;
4246 bool fixed = !!req->open.file_slot;
4249 ret = build_open_flags(&req->open.how, &op);
4252 nonblock_set = op.open_flag & O_NONBLOCK;
4253 resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED;
4254 if (issue_flags & IO_URING_F_NONBLOCK) {
4256 * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open,
4257 * it'll always -EAGAIN
4259 if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE))
4261 op.lookup_flags |= LOOKUP_CACHED;
4262 op.open_flag |= O_NONBLOCK;
4266 ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile);
4271 file = do_filp_open(req->open.dfd, req->open.filename, &op);
4274 * We could hang on to this 'fd' on retrying, but seems like
4275 * marginal gain for something that is now known to be a slower
4276 * path. So just put it, and we'll get a new one when we retry.
4281 ret = PTR_ERR(file);
4282 /* only retry if RESOLVE_CACHED wasn't already set by application */
4283 if (ret == -EAGAIN &&
4284 (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK)))
4289 if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set)
4290 file->f_flags &= ~O_NONBLOCK;
4291 fsnotify_open(file);
4294 fd_install(ret, file);
4296 ret = io_install_fixed_file(req, file, issue_flags,
4297 req->open.file_slot - 1);
4299 putname(req->open.filename);
4300 req->flags &= ~REQ_F_NEED_CLEANUP;
4303 __io_req_complete(req, issue_flags, ret, 0);
4307 static int io_openat(struct io_kiocb *req, unsigned int issue_flags)
4309 return io_openat2(req, issue_flags);
4312 static int io_remove_buffers_prep(struct io_kiocb *req,
4313 const struct io_uring_sqe *sqe)
4315 struct io_provide_buf *p = &req->pbuf;
4318 if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off ||
4322 tmp = READ_ONCE(sqe->fd);
4323 if (!tmp || tmp > USHRT_MAX)
4326 memset(p, 0, sizeof(*p));
4328 p->bgid = READ_ONCE(sqe->buf_group);
4332 static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf,
4333 int bgid, unsigned nbufs)
4337 /* shouldn't happen */
4341 /* the head kbuf is the list itself */
4342 while (!list_empty(&buf->list)) {
4343 struct io_buffer *nxt;
4345 nxt = list_first_entry(&buf->list, struct io_buffer, list);
4346 list_del(&nxt->list);
4354 xa_erase(&ctx->io_buffers, bgid);
4359 static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags)
4361 struct io_provide_buf *p = &req->pbuf;
4362 struct io_ring_ctx *ctx = req->ctx;
4363 struct io_buffer *head;
4365 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
4367 io_ring_submit_lock(ctx, !force_nonblock);
4369 lockdep_assert_held(&ctx->uring_lock);
4372 head = xa_load(&ctx->io_buffers, p->bgid);
4374 ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs);
4378 /* complete before unlock, IOPOLL may need the lock */
4379 __io_req_complete(req, issue_flags, ret, 0);
4380 io_ring_submit_unlock(ctx, !force_nonblock);
4384 static int io_provide_buffers_prep(struct io_kiocb *req,
4385 const struct io_uring_sqe *sqe)
4387 unsigned long size, tmp_check;
4388 struct io_provide_buf *p = &req->pbuf;
4391 if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in)
4394 tmp = READ_ONCE(sqe->fd);
4395 if (!tmp || tmp > USHRT_MAX)
4398 p->addr = READ_ONCE(sqe->addr);
4399 p->len = READ_ONCE(sqe->len);
4401 if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs,
4404 if (check_add_overflow((unsigned long)p->addr, size, &tmp_check))
4407 size = (unsigned long)p->len * p->nbufs;
4408 if (!access_ok(u64_to_user_ptr(p->addr), size))
4411 p->bgid = READ_ONCE(sqe->buf_group);
4412 tmp = READ_ONCE(sqe->off);
4413 if (tmp > USHRT_MAX)
4419 static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head)
4421 struct io_buffer *buf;
4422 u64 addr = pbuf->addr;
4423 int i, bid = pbuf->bid;
4425 for (i = 0; i < pbuf->nbufs; i++) {
4426 buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT);
4431 buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT);
4436 INIT_LIST_HEAD(&buf->list);
4439 list_add_tail(&buf->list, &(*head)->list);
4443 return i ? i : -ENOMEM;
4446 static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
4448 struct io_provide_buf *p = &req->pbuf;
4449 struct io_ring_ctx *ctx = req->ctx;
4450 struct io_buffer *head, *list;
4452 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
4454 io_ring_submit_lock(ctx, !force_nonblock);
4456 lockdep_assert_held(&ctx->uring_lock);
4458 list = head = xa_load(&ctx->io_buffers, p->bgid);
4460 ret = io_add_buffers(p, &head);
4461 if (ret >= 0 && !list) {
4462 ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL);
4464 __io_remove_buffers(ctx, head, p->bgid, -1U);
4468 /* complete before unlock, IOPOLL may need the lock */
4469 __io_req_complete(req, issue_flags, ret, 0);
4470 io_ring_submit_unlock(ctx, !force_nonblock);
4474 static int io_epoll_ctl_prep(struct io_kiocb *req,
4475 const struct io_uring_sqe *sqe)
4477 #if defined(CONFIG_EPOLL)
4478 if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
4480 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4483 req->epoll.epfd = READ_ONCE(sqe->fd);
4484 req->epoll.op = READ_ONCE(sqe->len);
4485 req->epoll.fd = READ_ONCE(sqe->off);
4487 if (ep_op_has_event(req->epoll.op)) {
4488 struct epoll_event __user *ev;
4490 ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
4491 if (copy_from_user(&req->epoll.event, ev, sizeof(*ev)))
4501 static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags)
4503 #if defined(CONFIG_EPOLL)
4504 struct io_epoll *ie = &req->epoll;
4506 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
4508 ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
4509 if (force_nonblock && ret == -EAGAIN)
4514 __io_req_complete(req, issue_flags, ret, 0);
4521 static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4523 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
4524 if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in)
4526 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4529 req->madvise.addr = READ_ONCE(sqe->addr);
4530 req->madvise.len = READ_ONCE(sqe->len);
4531 req->madvise.advice = READ_ONCE(sqe->fadvise_advice);
4538 static int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
4540 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
4541 struct io_madvise *ma = &req->madvise;
4544 if (issue_flags & IO_URING_F_NONBLOCK)
4547 ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
4550 io_req_complete(req, ret);
4557 static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4559 if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in)
4561 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4564 req->fadvise.offset = READ_ONCE(sqe->off);
4565 req->fadvise.len = READ_ONCE(sqe->len);
4566 req->fadvise.advice = READ_ONCE(sqe->fadvise_advice);
4570 static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
4572 struct io_fadvise *fa = &req->fadvise;
4575 if (issue_flags & IO_URING_F_NONBLOCK) {
4576 switch (fa->advice) {
4577 case POSIX_FADV_NORMAL:
4578 case POSIX_FADV_RANDOM:
4579 case POSIX_FADV_SEQUENTIAL:
4586 ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
4589 __io_req_complete(req, issue_flags, ret, 0);
4593 static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4595 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4597 if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
4599 if (req->flags & REQ_F_FIXED_FILE)
4602 req->statx.dfd = READ_ONCE(sqe->fd);
4603 req->statx.mask = READ_ONCE(sqe->len);
4604 req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr));
4605 req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
4606 req->statx.flags = READ_ONCE(sqe->statx_flags);
4611 static int io_statx(struct io_kiocb *req, unsigned int issue_flags)
4613 struct io_statx *ctx = &req->statx;
4616 if (issue_flags & IO_URING_F_NONBLOCK)
4619 ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask,
4624 io_req_complete(req, ret);
4628 static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4630 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4632 if (sqe->ioprio || sqe->off || sqe->addr || sqe->len ||
4633 sqe->rw_flags || sqe->buf_index)
4635 if (req->flags & REQ_F_FIXED_FILE)
4638 req->close.fd = READ_ONCE(sqe->fd);
4639 req->close.file_slot = READ_ONCE(sqe->file_index);
4640 if (req->close.file_slot && req->close.fd)
4646 static int io_close(struct io_kiocb *req, unsigned int issue_flags)
4648 struct files_struct *files = current->files;
4649 struct io_close *close = &req->close;
4650 struct fdtable *fdt;
4651 struct file *file = NULL;
4654 if (req->close.file_slot) {
4655 ret = io_close_fixed(req, issue_flags);
4659 spin_lock(&files->file_lock);
4660 fdt = files_fdtable(files);
4661 if (close->fd >= fdt->max_fds) {
4662 spin_unlock(&files->file_lock);
4665 file = fdt->fd[close->fd];
4666 if (!file || file->f_op == &io_uring_fops) {
4667 spin_unlock(&files->file_lock);
4672 /* if the file has a flush method, be safe and punt to async */
4673 if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) {
4674 spin_unlock(&files->file_lock);
4678 ret = __close_fd_get_file(close->fd, &file);
4679 spin_unlock(&files->file_lock);
4686 /* No ->flush() or already async, safely close from here */
4687 ret = filp_close(file, current->files);
4693 __io_req_complete(req, issue_flags, ret, 0);
4697 static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4699 struct io_ring_ctx *ctx = req->ctx;
4701 if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
4703 if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
4707 req->sync.off = READ_ONCE(sqe->off);
4708 req->sync.len = READ_ONCE(sqe->len);
4709 req->sync.flags = READ_ONCE(sqe->sync_range_flags);
4713 static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
4717 /* sync_file_range always requires a blocking context */
4718 if (issue_flags & IO_URING_F_NONBLOCK)
4721 ret = sync_file_range(req->file, req->sync.off, req->sync.len,
4725 io_req_complete(req, ret);
4729 #if defined(CONFIG_NET)
4730 static int io_setup_async_msg(struct io_kiocb *req,
4731 struct io_async_msghdr *kmsg)
4733 struct io_async_msghdr *async_msg = req->async_data;
4737 if (io_alloc_async_data(req)) {
4738 kfree(kmsg->free_iov);
4741 async_msg = req->async_data;
4742 req->flags |= REQ_F_NEED_CLEANUP;
4743 memcpy(async_msg, kmsg, sizeof(*kmsg));
4744 async_msg->msg.msg_name = &async_msg->addr;
4745 /* if were using fast_iov, set it to the new one */
4746 if (!async_msg->free_iov)
4747 async_msg->msg.msg_iter.iov = async_msg->fast_iov;
4752 static int io_sendmsg_copy_hdr(struct io_kiocb *req,
4753 struct io_async_msghdr *iomsg)
4755 iomsg->msg.msg_name = &iomsg->addr;
4756 iomsg->free_iov = iomsg->fast_iov;
4757 return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg,
4758 req->sr_msg.msg_flags, &iomsg->free_iov);
4761 static int io_sendmsg_prep_async(struct io_kiocb *req)
4765 ret = io_sendmsg_copy_hdr(req, req->async_data);
4767 req->flags |= REQ_F_NEED_CLEANUP;
4771 static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4773 struct io_sr_msg *sr = &req->sr_msg;
4775 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4778 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
4779 sr->len = READ_ONCE(sqe->len);
4780 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
4781 if (sr->msg_flags & MSG_DONTWAIT)
4782 req->flags |= REQ_F_NOWAIT;
4784 #ifdef CONFIG_COMPAT
4785 if (req->ctx->compat)
4786 sr->msg_flags |= MSG_CMSG_COMPAT;
4791 static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
4793 struct io_async_msghdr iomsg, *kmsg;
4794 struct socket *sock;
4799 sock = sock_from_file(req->file);
4800 if (unlikely(!sock))
4803 kmsg = req->async_data;
4805 ret = io_sendmsg_copy_hdr(req, &iomsg);
4811 flags = req->sr_msg.msg_flags;
4812 if (issue_flags & IO_URING_F_NONBLOCK)
4813 flags |= MSG_DONTWAIT;
4814 if (flags & MSG_WAITALL)
4815 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
4817 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
4818 if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN)
4819 return io_setup_async_msg(req, kmsg);
4820 if (ret == -ERESTARTSYS)
4823 /* fast path, check for non-NULL to avoid function call */
4825 kfree(kmsg->free_iov);
4826 req->flags &= ~REQ_F_NEED_CLEANUP;
4829 __io_req_complete(req, issue_flags, ret, 0);
4833 static int io_send(struct io_kiocb *req, unsigned int issue_flags)
4835 struct io_sr_msg *sr = &req->sr_msg;
4838 struct socket *sock;
4843 sock = sock_from_file(req->file);
4844 if (unlikely(!sock))
4847 ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
4851 msg.msg_name = NULL;
4852 msg.msg_control = NULL;
4853 msg.msg_controllen = 0;
4854 msg.msg_namelen = 0;
4856 flags = req->sr_msg.msg_flags;
4857 if (issue_flags & IO_URING_F_NONBLOCK)
4858 flags |= MSG_DONTWAIT;
4859 if (flags & MSG_WAITALL)
4860 min_ret = iov_iter_count(&msg.msg_iter);
4862 msg.msg_flags = flags;
4863 ret = sock_sendmsg(sock, &msg);
4864 if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN)
4866 if (ret == -ERESTARTSYS)
4871 __io_req_complete(req, issue_flags, ret, 0);
4875 static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
4876 struct io_async_msghdr *iomsg)
4878 struct io_sr_msg *sr = &req->sr_msg;
4879 struct iovec __user *uiov;
4883 ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg,
4884 &iomsg->uaddr, &uiov, &iov_len);
4888 if (req->flags & REQ_F_BUFFER_SELECT) {
4891 if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov)))
4893 sr->len = iomsg->fast_iov[0].iov_len;
4894 iomsg->free_iov = NULL;
4896 iomsg->free_iov = iomsg->fast_iov;
4897 ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
4898 &iomsg->free_iov, &iomsg->msg.msg_iter,
4907 #ifdef CONFIG_COMPAT
4908 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
4909 struct io_async_msghdr *iomsg)
4911 struct io_sr_msg *sr = &req->sr_msg;
4912 struct compat_iovec __user *uiov;
4917 ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr,
4922 uiov = compat_ptr(ptr);
4923 if (req->flags & REQ_F_BUFFER_SELECT) {
4924 compat_ssize_t clen;
4928 if (!access_ok(uiov, sizeof(*uiov)))
4930 if (__get_user(clen, &uiov->iov_len))
4935 iomsg->free_iov = NULL;
4937 iomsg->free_iov = iomsg->fast_iov;
4938 ret = __import_iovec(READ, (struct iovec __user *)uiov, len,
4939 UIO_FASTIOV, &iomsg->free_iov,
4940 &iomsg->msg.msg_iter, true);
4949 static int io_recvmsg_copy_hdr(struct io_kiocb *req,
4950 struct io_async_msghdr *iomsg)
4952 iomsg->msg.msg_name = &iomsg->addr;
4954 #ifdef CONFIG_COMPAT
4955 if (req->ctx->compat)
4956 return __io_compat_recvmsg_copy_hdr(req, iomsg);
4959 return __io_recvmsg_copy_hdr(req, iomsg);
4962 static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req,
4965 struct io_sr_msg *sr = &req->sr_msg;
4966 struct io_buffer *kbuf;
4968 kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock);
4973 req->flags |= REQ_F_BUFFER_SELECTED;
4977 static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req)
4979 return io_put_kbuf(req, req->sr_msg.kbuf);
4982 static int io_recvmsg_prep_async(struct io_kiocb *req)
4986 ret = io_recvmsg_copy_hdr(req, req->async_data);
4988 req->flags |= REQ_F_NEED_CLEANUP;
4992 static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
4994 struct io_sr_msg *sr = &req->sr_msg;
4996 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
4999 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
5000 sr->len = READ_ONCE(sqe->len);
5001 sr->bgid = READ_ONCE(sqe->buf_group);
5002 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
5003 if (sr->msg_flags & MSG_DONTWAIT)
5004 req->flags |= REQ_F_NOWAIT;
5006 #ifdef CONFIG_COMPAT
5007 if (req->ctx->compat)
5008 sr->msg_flags |= MSG_CMSG_COMPAT;
5013 static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
5015 struct io_async_msghdr iomsg, *kmsg;
5016 struct socket *sock;
5017 struct io_buffer *kbuf;
5020 int ret, cflags = 0;
5021 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
5023 sock = sock_from_file(req->file);
5024 if (unlikely(!sock))
5027 kmsg = req->async_data;
5029 ret = io_recvmsg_copy_hdr(req, &iomsg);
5035 if (req->flags & REQ_F_BUFFER_SELECT) {
5036 kbuf = io_recv_buffer_select(req, !force_nonblock);
5038 return PTR_ERR(kbuf);
5039 kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
5040 kmsg->fast_iov[0].iov_len = req->sr_msg.len;
5041 iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov,
5042 1, req->sr_msg.len);
5045 flags = req->sr_msg.msg_flags;
5047 flags |= MSG_DONTWAIT;
5048 if (flags & MSG_WAITALL)
5049 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
5051 ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg,
5052 kmsg->uaddr, flags);
5053 if (force_nonblock && ret == -EAGAIN)
5054 return io_setup_async_msg(req, kmsg);
5055 if (ret == -ERESTARTSYS)
5058 if (req->flags & REQ_F_BUFFER_SELECTED)
5059 cflags = io_put_recv_kbuf(req);
5060 /* fast path, check for non-NULL to avoid function call */
5062 kfree(kmsg->free_iov);
5063 req->flags &= ~REQ_F_NEED_CLEANUP;
5064 if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))))
5066 __io_req_complete(req, issue_flags, ret, cflags);
5070 static int io_recv(struct io_kiocb *req, unsigned int issue_flags)
5072 struct io_buffer *kbuf;
5073 struct io_sr_msg *sr = &req->sr_msg;
5075 void __user *buf = sr->buf;
5076 struct socket *sock;
5080 int ret, cflags = 0;
5081 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
5083 sock = sock_from_file(req->file);
5084 if (unlikely(!sock))
5087 if (req->flags & REQ_F_BUFFER_SELECT) {
5088 kbuf = io_recv_buffer_select(req, !force_nonblock);
5090 return PTR_ERR(kbuf);
5091 buf = u64_to_user_ptr(kbuf->addr);
5094 ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter);
5098 msg.msg_name = NULL;
5099 msg.msg_control = NULL;
5100 msg.msg_controllen = 0;
5101 msg.msg_namelen = 0;
5102 msg.msg_iocb = NULL;
5105 flags = req->sr_msg.msg_flags;
5107 flags |= MSG_DONTWAIT;
5108 if (flags & MSG_WAITALL)
5109 min_ret = iov_iter_count(&msg.msg_iter);
5111 ret = sock_recvmsg(sock, &msg, flags);
5112 if (force_nonblock && ret == -EAGAIN)
5114 if (ret == -ERESTARTSYS)
5117 if (req->flags & REQ_F_BUFFER_SELECTED)
5118 cflags = io_put_recv_kbuf(req);
5119 if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))))
5121 __io_req_complete(req, issue_flags, ret, cflags);
5125 static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
5127 struct io_accept *accept = &req->accept;
5129 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
5131 if (sqe->ioprio || sqe->len || sqe->buf_index)
5134 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
5135 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
5136 accept->flags = READ_ONCE(sqe->accept_flags);
5137 accept->nofile = rlimit(RLIMIT_NOFILE);
5139 accept->file_slot = READ_ONCE(sqe->file_index);
5140 if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) ||
5141 (accept->flags & SOCK_CLOEXEC)))
5143 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
5145 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
5146 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
5150 static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
5152 struct io_accept *accept = &req->accept;
5153 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
5154 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
5155 bool fixed = !!accept->file_slot;
5159 if (req->file->f_flags & O_NONBLOCK)
5160 req->flags |= REQ_F_NOWAIT;
5163 fd = __get_unused_fd_flags(accept->flags, accept->nofile);
5164 if (unlikely(fd < 0))
5167 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
5172 ret = PTR_ERR(file);
5173 if (ret == -EAGAIN && force_nonblock)
5175 if (ret == -ERESTARTSYS)
5178 } else if (!fixed) {
5179 fd_install(fd, file);
5182 ret = io_install_fixed_file(req, file, issue_flags,
5183 accept->file_slot - 1);
5185 __io_req_complete(req, issue_flags, ret, 0);
5189 static int io_connect_prep_async(struct io_kiocb *req)
5191 struct io_async_connect *io = req->async_data;
5192 struct io_connect *conn = &req->connect;
5194 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address);
5197 static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
5199 struct io_connect *conn = &req->connect;
5201 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
5203 if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags ||
5207 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
5208 conn->addr_len = READ_ONCE(sqe->addr2);
5212 static int io_connect(struct io_kiocb *req, unsigned int issue_flags)
5214 struct io_async_connect __io, *io;
5215 unsigned file_flags;
5217 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
5219 if (req->async_data) {
5220 io = req->async_data;
5222 ret = move_addr_to_kernel(req->connect.addr,
5223 req->connect.addr_len,
5230 file_flags = force_nonblock ? O_NONBLOCK : 0;
5232 ret = __sys_connect_file(req->file, &io->address,
5233 req->connect.addr_len, file_flags);
5234 if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
5235 if (req->async_data)
5237 if (io_alloc_async_data(req)) {
5241 memcpy(req->async_data, &__io, sizeof(__io));
5244 if (ret == -ERESTARTSYS)
5249 __io_req_complete(req, issue_flags, ret, 0);
5252 #else /* !CONFIG_NET */
5253 #define IO_NETOP_FN(op) \
5254 static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \
5256 return -EOPNOTSUPP; \
5259 #define IO_NETOP_PREP(op) \
5261 static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \
5263 return -EOPNOTSUPP; \
5266 #define IO_NETOP_PREP_ASYNC(op) \
5268 static int io_##op##_prep_async(struct io_kiocb *req) \
5270 return -EOPNOTSUPP; \
5273 IO_NETOP_PREP_ASYNC(sendmsg);
5274 IO_NETOP_PREP_ASYNC(recvmsg);
5275 IO_NETOP_PREP_ASYNC(connect);
5276 IO_NETOP_PREP(accept);
5279 #endif /* CONFIG_NET */
5281 struct io_poll_table {
5282 struct poll_table_struct pt;
5283 struct io_kiocb *req;
5288 static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
5289 __poll_t mask, io_req_tw_func_t func)
5291 /* for instances that support it check for an event match first: */
5292 if (mask && !(mask & poll->events))
5295 trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask);
5297 list_del_init(&poll->wait.entry);
5300 req->io_task_work.func = func;
5303 * If this fails, then the task is exiting. When a task exits, the
5304 * work gets canceled, so just cancel this request as well instead
5305 * of executing it. We can't safely execute it anyway, as we may not
5306 * have the needed state needed for it anyway.
5308 io_req_task_work_add(req);
5312 static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll)
5313 __acquires(&req->ctx->completion_lock)
5315 struct io_ring_ctx *ctx = req->ctx;
5317 /* req->task == current here, checking PF_EXITING is safe */
5318 if (unlikely(req->task->flags & PF_EXITING))
5319 WRITE_ONCE(poll->canceled, true);
5321 if (!req->result && !READ_ONCE(poll->canceled)) {
5322 struct poll_table_struct pt = { ._key = poll->events };
5324 req->result = vfs_poll(req->file, &pt) & poll->events;
5327 spin_lock(&ctx->completion_lock);
5328 if (!req->result && !READ_ONCE(poll->canceled)) {
5329 add_wait_queue(poll->head, &poll->wait);
5336 static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req)
5338 /* pure poll stashes this in ->async_data, poll driven retry elsewhere */
5339 if (req->opcode == IORING_OP_POLL_ADD)
5340 return req->async_data;
5341 return req->apoll->double_poll;
5344 static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req)
5346 if (req->opcode == IORING_OP_POLL_ADD)
5348 return &req->apoll->poll;
5351 static void io_poll_remove_double(struct io_kiocb *req)
5352 __must_hold(&req->ctx->completion_lock)
5354 struct io_poll_iocb *poll = io_poll_get_double(req);
5356 lockdep_assert_held(&req->ctx->completion_lock);
5358 if (poll && poll->head) {
5359 struct wait_queue_head *head = poll->head;
5361 spin_lock_irq(&head->lock);
5362 list_del_init(&poll->wait.entry);
5363 if (poll->wait.private)
5366 spin_unlock_irq(&head->lock);
5370 static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask)
5371 __must_hold(&req->ctx->completion_lock)
5373 struct io_ring_ctx *ctx = req->ctx;
5374 unsigned flags = IORING_CQE_F_MORE;
5377 if (READ_ONCE(req->poll.canceled)) {
5379 req->poll.events |= EPOLLONESHOT;
5381 error = mangle_poll(mask);
5383 if (req->poll.events & EPOLLONESHOT)
5385 if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) {
5386 req->poll.events |= EPOLLONESHOT;
5389 if (flags & IORING_CQE_F_MORE)
5392 return !(flags & IORING_CQE_F_MORE);
5395 static inline bool io_poll_complete(struct io_kiocb *req, __poll_t mask)
5396 __must_hold(&req->ctx->completion_lock)
5400 done = __io_poll_complete(req, mask);
5401 io_commit_cqring(req->ctx);
5405 static void io_poll_task_func(struct io_kiocb *req, bool *locked)
5407 struct io_ring_ctx *ctx = req->ctx;
5408 struct io_kiocb *nxt;
5410 if (io_poll_rewait(req, &req->poll)) {
5411 spin_unlock(&ctx->completion_lock);
5415 if (req->poll.done) {
5416 spin_unlock(&ctx->completion_lock);
5419 done = __io_poll_complete(req, req->result);
5421 io_poll_remove_double(req);
5422 hash_del(&req->hash_node);
5423 req->poll.done = true;
5426 add_wait_queue(req->poll.head, &req->poll.wait);
5428 io_commit_cqring(ctx);
5429 spin_unlock(&ctx->completion_lock);
5430 io_cqring_ev_posted(ctx);
5433 nxt = io_put_req_find_next(req);
5435 io_req_task_submit(nxt, locked);
5440 static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode,
5441 int sync, void *key)
5443 struct io_kiocb *req = wait->private;
5444 struct io_poll_iocb *poll = io_poll_get_single(req);
5445 __poll_t mask = key_to_poll(key);
5446 unsigned long flags;
5448 /* for instances that support it check for an event match first: */
5449 if (mask && !(mask & poll->events))
5451 if (!(poll->events & EPOLLONESHOT))
5452 return poll->wait.func(&poll->wait, mode, sync, key);
5454 list_del_init(&wait->entry);
5459 spin_lock_irqsave(&poll->head->lock, flags);
5460 done = list_empty(&poll->wait.entry);
5462 list_del_init(&poll->wait.entry);
5463 /* make sure double remove sees this as being gone */
5464 wait->private = NULL;
5465 spin_unlock_irqrestore(&poll->head->lock, flags);
5467 /* use wait func handler, so it matches the rq type */
5468 poll->wait.func(&poll->wait, mode, sync, key);
5475 static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events,
5476 wait_queue_func_t wake_func)
5480 poll->canceled = false;
5481 #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP)
5482 /* mask in events that we always want/need */
5483 poll->events = events | IO_POLL_UNMASK;
5484 INIT_LIST_HEAD(&poll->wait.entry);
5485 init_waitqueue_func_entry(&poll->wait, wake_func);
5488 static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt,
5489 struct wait_queue_head *head,
5490 struct io_poll_iocb **poll_ptr)
5492 struct io_kiocb *req = pt->req;
5495 * The file being polled uses multiple waitqueues for poll handling
5496 * (e.g. one for read, one for write). Setup a separate io_poll_iocb
5499 if (unlikely(pt->nr_entries)) {
5500 struct io_poll_iocb *poll_one = poll;
5502 /* double add on the same waitqueue head, ignore */
5503 if (poll_one->head == head)
5505 /* already have a 2nd entry, fail a third attempt */
5507 if ((*poll_ptr)->head == head)
5509 pt->error = -EINVAL;
5513 * Can't handle multishot for double wait for now, turn it
5514 * into one-shot mode.
5516 if (!(poll_one->events & EPOLLONESHOT))
5517 poll_one->events |= EPOLLONESHOT;
5518 poll = kmalloc(sizeof(*poll), GFP_ATOMIC);
5520 pt->error = -ENOMEM;
5523 io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake);
5525 poll->wait.private = req;
5532 if (poll->events & EPOLLEXCLUSIVE)
5533 add_wait_queue_exclusive(head, &poll->wait);
5535 add_wait_queue(head, &poll->wait);
5538 static void io_async_queue_proc(struct file *file, struct wait_queue_head *head,
5539 struct poll_table_struct *p)
5541 struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
5542 struct async_poll *apoll = pt->req->apoll;
5544 __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll);
5547 static void io_async_task_func(struct io_kiocb *req, bool *locked)
5549 struct async_poll *apoll = req->apoll;
5550 struct io_ring_ctx *ctx = req->ctx;
5552 trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data);
5554 if (io_poll_rewait(req, &apoll->poll)) {
5555 spin_unlock(&ctx->completion_lock);
5559 hash_del(&req->hash_node);
5560 io_poll_remove_double(req);
5561 apoll->poll.done = true;
5562 spin_unlock(&ctx->completion_lock);
5564 if (!READ_ONCE(apoll->poll.canceled))
5565 io_req_task_submit(req, locked);
5567 io_req_complete_failed(req, -ECANCELED);
5570 static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
5573 struct io_kiocb *req = wait->private;
5574 struct io_poll_iocb *poll = &req->apoll->poll;
5576 trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data,
5579 return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func);
5582 static void io_poll_req_insert(struct io_kiocb *req)
5584 struct io_ring_ctx *ctx = req->ctx;
5585 struct hlist_head *list;
5587 list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)];
5588 hlist_add_head(&req->hash_node, list);
5591 static __poll_t __io_arm_poll_handler(struct io_kiocb *req,
5592 struct io_poll_iocb *poll,
5593 struct io_poll_table *ipt, __poll_t mask,
5594 wait_queue_func_t wake_func)
5595 __acquires(&ctx->completion_lock)
5597 struct io_ring_ctx *ctx = req->ctx;
5598 bool cancel = false;
5600 INIT_HLIST_NODE(&req->hash_node);
5601 io_init_poll_iocb(poll, mask, wake_func);
5602 poll->file = req->file;
5603 poll->wait.private = req;
5605 ipt->pt._key = mask;
5608 ipt->nr_entries = 0;
5610 mask = vfs_poll(req->file, &ipt->pt) & poll->events;
5611 if (unlikely(!ipt->nr_entries) && !ipt->error)
5612 ipt->error = -EINVAL;
5614 spin_lock(&ctx->completion_lock);
5615 if (ipt->error || (mask && (poll->events & EPOLLONESHOT)))
5616 io_poll_remove_double(req);
5617 if (likely(poll->head)) {
5618 spin_lock_irq(&poll->head->lock);
5619 if (unlikely(list_empty(&poll->wait.entry))) {
5625 if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error)
5626 list_del_init(&poll->wait.entry);
5628 WRITE_ONCE(poll->canceled, true);
5629 else if (!poll->done) /* actually waiting for an event */
5630 io_poll_req_insert(req);
5631 spin_unlock_irq(&poll->head->lock);
5643 static int io_arm_poll_handler(struct io_kiocb *req)
5645 const struct io_op_def *def = &io_op_defs[req->opcode];
5646 struct io_ring_ctx *ctx = req->ctx;
5647 struct async_poll *apoll;
5648 struct io_poll_table ipt;
5649 __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI;
5652 if (!req->file || !file_can_poll(req->file))
5653 return IO_APOLL_ABORTED;
5654 if (req->flags & REQ_F_POLLED)
5655 return IO_APOLL_ABORTED;
5656 if (!def->pollin && !def->pollout)
5657 return IO_APOLL_ABORTED;
5661 mask |= POLLIN | POLLRDNORM;
5663 /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */
5664 if ((req->opcode == IORING_OP_RECVMSG) &&
5665 (req->sr_msg.msg_flags & MSG_ERRQUEUE))
5669 mask |= POLLOUT | POLLWRNORM;
5672 /* if we can't nonblock try, then no point in arming a poll handler */
5673 if (!io_file_supports_nowait(req, rw))
5674 return IO_APOLL_ABORTED;
5676 apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC);
5677 if (unlikely(!apoll))
5678 return IO_APOLL_ABORTED;
5679 apoll->double_poll = NULL;
5681 req->flags |= REQ_F_POLLED;
5682 ipt.pt._qproc = io_async_queue_proc;
5683 io_req_set_refcount(req);
5685 ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask,
5687 spin_unlock(&ctx->completion_lock);
5688 if (ret || ipt.error)
5689 return ret ? IO_APOLL_READY : IO_APOLL_ABORTED;
5691 trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data,
5692 mask, apoll->poll.events);
5696 static bool __io_poll_remove_one(struct io_kiocb *req,
5697 struct io_poll_iocb *poll, bool do_cancel)
5698 __must_hold(&req->ctx->completion_lock)
5700 bool do_complete = false;
5704 spin_lock_irq(&poll->head->lock);
5706 WRITE_ONCE(poll->canceled, true);
5707 if (!list_empty(&poll->wait.entry)) {
5708 list_del_init(&poll->wait.entry);
5711 spin_unlock_irq(&poll->head->lock);
5712 hash_del(&req->hash_node);
5716 static bool io_poll_remove_one(struct io_kiocb *req)
5717 __must_hold(&req->ctx->completion_lock)
5721 io_poll_remove_double(req);
5722 do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true);
5725 io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0);
5726 io_commit_cqring(req->ctx);
5728 io_put_req_deferred(req);
5734 * Returns true if we found and killed one or more poll requests
5736 static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
5739 struct hlist_node *tmp;
5740 struct io_kiocb *req;
5743 spin_lock(&ctx->completion_lock);
5744 for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
5745 struct hlist_head *list;
5747 list = &ctx->cancel_hash[i];
5748 hlist_for_each_entry_safe(req, tmp, list, hash_node) {
5749 if (io_match_task_safe(req, tsk, cancel_all))
5750 posted += io_poll_remove_one(req);
5753 spin_unlock(&ctx->completion_lock);
5756 io_cqring_ev_posted(ctx);
5761 static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr,
5763 __must_hold(&ctx->completion_lock)
5765 struct hlist_head *list;
5766 struct io_kiocb *req;
5768 list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)];
5769 hlist_for_each_entry(req, list, hash_node) {
5770 if (sqe_addr != req->user_data)
5772 if (poll_only && req->opcode != IORING_OP_POLL_ADD)
5779 static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr,
5781 __must_hold(&ctx->completion_lock)
5783 struct io_kiocb *req;
5785 req = io_poll_find(ctx, sqe_addr, poll_only);
5788 if (io_poll_remove_one(req))
5794 static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe,
5799 events = READ_ONCE(sqe->poll32_events);
5801 events = swahw32(events);
5803 if (!(flags & IORING_POLL_ADD_MULTI))
5804 events |= EPOLLONESHOT;
5805 return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT));
5808 static int io_poll_update_prep(struct io_kiocb *req,
5809 const struct io_uring_sqe *sqe)
5811 struct io_poll_update *upd = &req->poll_update;
5814 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
5816 if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
5818 flags = READ_ONCE(sqe->len);
5819 if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA |
5820 IORING_POLL_ADD_MULTI))
5822 /* meaningless without update */
5823 if (flags == IORING_POLL_ADD_MULTI)
5826 upd->old_user_data = READ_ONCE(sqe->addr);
5827 upd->update_events = flags & IORING_POLL_UPDATE_EVENTS;
5828 upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA;
5830 upd->new_user_data = READ_ONCE(sqe->off);
5831 if (!upd->update_user_data && upd->new_user_data)
5833 if (upd->update_events)
5834 upd->events = io_poll_parse_events(sqe, flags);
5835 else if (sqe->poll32_events)
5841 static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
5844 struct io_kiocb *req = wait->private;
5845 struct io_poll_iocb *poll = &req->poll;
5847 return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func);
5850 static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head,
5851 struct poll_table_struct *p)
5853 struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
5855 __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data);
5858 static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
5860 struct io_poll_iocb *poll = &req->poll;
5863 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
5865 if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr)
5867 flags = READ_ONCE(sqe->len);
5868 if (flags & ~IORING_POLL_ADD_MULTI)
5871 io_req_set_refcount(req);
5872 poll->events = io_poll_parse_events(sqe, flags);
5876 static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags)
5878 struct io_poll_iocb *poll = &req->poll;
5879 struct io_ring_ctx *ctx = req->ctx;
5880 struct io_poll_table ipt;
5884 ipt.pt._qproc = io_poll_queue_proc;
5886 mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events,
5889 if (mask) { /* no async, we'd stolen it */
5891 done = io_poll_complete(req, mask);
5893 spin_unlock(&ctx->completion_lock);
5896 io_cqring_ev_posted(ctx);
5903 static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags)
5905 struct io_ring_ctx *ctx = req->ctx;
5906 struct io_kiocb *preq;
5910 spin_lock(&ctx->completion_lock);
5911 preq = io_poll_find(ctx, req->poll_update.old_user_data, true);
5917 if (!req->poll_update.update_events && !req->poll_update.update_user_data) {
5919 ret = io_poll_remove_one(preq) ? 0 : -EALREADY;
5924 * Don't allow racy completion with singleshot, as we cannot safely
5925 * update those. For multishot, if we're racing with completion, just
5926 * let completion re-add it.
5928 io_poll_remove_double(preq);
5929 completing = !__io_poll_remove_one(preq, &preq->poll, false);
5930 if (completing && (preq->poll.events & EPOLLONESHOT)) {
5934 /* we now have a detached poll request. reissue. */
5938 spin_unlock(&ctx->completion_lock);
5940 io_req_complete(req, ret);
5943 /* only mask one event flags, keep behavior flags */
5944 if (req->poll_update.update_events) {
5945 preq->poll.events &= ~0xffff;
5946 preq->poll.events |= req->poll_update.events & 0xffff;
5947 preq->poll.events |= IO_POLL_UNMASK;
5949 if (req->poll_update.update_user_data)
5950 preq->user_data = req->poll_update.new_user_data;
5951 spin_unlock(&ctx->completion_lock);
5953 /* complete update request, we're done with it */
5954 io_req_complete(req, ret);
5957 ret = io_poll_add(preq, issue_flags);
5960 io_req_complete(preq, ret);
5966 static void io_req_task_timeout(struct io_kiocb *req, bool *locked)
5969 io_req_complete_post(req, -ETIME, 0);
5972 static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
5974 struct io_timeout_data *data = container_of(timer,
5975 struct io_timeout_data, timer);
5976 struct io_kiocb *req = data->req;
5977 struct io_ring_ctx *ctx = req->ctx;
5978 unsigned long flags;
5980 spin_lock_irqsave(&ctx->timeout_lock, flags);
5981 list_del_init(&req->timeout.list);
5982 atomic_set(&req->ctx->cq_timeouts,
5983 atomic_read(&req->ctx->cq_timeouts) + 1);
5984 spin_unlock_irqrestore(&ctx->timeout_lock, flags);
5986 req->io_task_work.func = io_req_task_timeout;
5987 io_req_task_work_add(req);
5988 return HRTIMER_NORESTART;
5991 static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
5993 __must_hold(&ctx->timeout_lock)
5995 struct io_timeout_data *io;
5996 struct io_kiocb *req;
5999 list_for_each_entry(req, &ctx->timeout_list, timeout.list) {
6000 found = user_data == req->user_data;
6005 return ERR_PTR(-ENOENT);
6007 io = req->async_data;
6008 if (hrtimer_try_to_cancel(&io->timer) == -1)
6009 return ERR_PTR(-EALREADY);
6010 list_del_init(&req->timeout.list);
6014 static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
6015 __must_hold(&ctx->completion_lock)
6016 __must_hold(&ctx->timeout_lock)
6018 struct io_kiocb *req = io_timeout_extract(ctx, user_data);
6021 return PTR_ERR(req);
6024 io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0);
6025 io_put_req_deferred(req);
6029 static clockid_t io_timeout_get_clock(struct io_timeout_data *data)
6031 switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) {
6032 case IORING_TIMEOUT_BOOTTIME:
6033 return CLOCK_BOOTTIME;
6034 case IORING_TIMEOUT_REALTIME:
6035 return CLOCK_REALTIME;
6037 /* can't happen, vetted at prep time */
6041 return CLOCK_MONOTONIC;
6045 static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
6046 struct timespec64 *ts, enum hrtimer_mode mode)
6047 __must_hold(&ctx->timeout_lock)
6049 struct io_timeout_data *io;
6050 struct io_kiocb *req;
6053 list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) {
6054 found = user_data == req->user_data;
6061 io = req->async_data;
6062 if (hrtimer_try_to_cancel(&io->timer) == -1)
6064 hrtimer_init(&io->timer, io_timeout_get_clock(io), mode);
6065 io->timer.function = io_link_timeout_fn;
6066 hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode);
6070 static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
6071 struct timespec64 *ts, enum hrtimer_mode mode)
6072 __must_hold(&ctx->timeout_lock)
6074 struct io_kiocb *req = io_timeout_extract(ctx, user_data);
6075 struct io_timeout_data *data;
6078 return PTR_ERR(req);
6080 req->timeout.off = 0; /* noseq */
6081 data = req->async_data;
6082 list_add_tail(&req->timeout.list, &ctx->timeout_list);
6083 hrtimer_init(&data->timer, io_timeout_get_clock(data), mode);
6084 data->timer.function = io_timeout_fn;
6085 hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode);
6089 static int io_timeout_remove_prep(struct io_kiocb *req,
6090 const struct io_uring_sqe *sqe)
6092 struct io_timeout_rem *tr = &req->timeout_rem;
6094 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
6096 if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
6098 if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in)
6101 tr->ltimeout = false;
6102 tr->addr = READ_ONCE(sqe->addr);
6103 tr->flags = READ_ONCE(sqe->timeout_flags);
6104 if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) {
6105 if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
6107 if (tr->flags & IORING_LINK_TIMEOUT_UPDATE)
6108 tr->ltimeout = true;
6109 if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS))
6111 if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2)))
6113 } else if (tr->flags) {
6114 /* timeout removal doesn't support flags */
6121 static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags)
6123 return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS
6128 * Remove or update an existing timeout command
6130 static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags)
6132 struct io_timeout_rem *tr = &req->timeout_rem;
6133 struct io_ring_ctx *ctx = req->ctx;
6136 if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) {
6137 spin_lock(&ctx->completion_lock);
6138 spin_lock_irq(&ctx->timeout_lock);
6139 ret = io_timeout_cancel(ctx, tr->addr);
6140 spin_unlock_irq(&ctx->timeout_lock);
6141 spin_unlock(&ctx->completion_lock);
6143 enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags);
6145 spin_lock_irq(&ctx->timeout_lock);
6147 ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode);
6149 ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode);
6150 spin_unlock_irq(&ctx->timeout_lock);
6155 io_req_complete_post(req, ret, 0);
6159 static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
6160 bool is_timeout_link)
6162 struct io_timeout_data *data;
6164 u32 off = READ_ONCE(sqe->off);
6166 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
6168 if (sqe->ioprio || sqe->buf_index || sqe->len != 1 ||
6171 if (off && is_timeout_link)
6173 flags = READ_ONCE(sqe->timeout_flags);
6174 if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK))
6176 /* more than one clock specified is invalid, obviously */
6177 if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
6180 INIT_LIST_HEAD(&req->timeout.list);
6181 req->timeout.off = off;
6182 if (unlikely(off && !req->ctx->off_timeout_used))
6183 req->ctx->off_timeout_used = true;
6185 if (!req->async_data && io_alloc_async_data(req))
6188 data = req->async_data;
6190 data->flags = flags;
6192 if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr)))
6195 data->mode = io_translate_timeout_mode(flags);
6196 hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode);
6198 if (is_timeout_link) {
6199 struct io_submit_link *link = &req->ctx->submit_state.link;
6203 if (link->last->opcode == IORING_OP_LINK_TIMEOUT)
6205 req->timeout.head = link->last;
6206 link->last->flags |= REQ_F_ARM_LTIMEOUT;
6211 static int io_timeout(struct io_kiocb *req, unsigned int issue_flags)
6213 struct io_ring_ctx *ctx = req->ctx;
6214 struct io_timeout_data *data = req->async_data;
6215 struct list_head *entry;
6216 u32 tail, off = req->timeout.off;
6218 spin_lock_irq(&ctx->timeout_lock);
6221 * sqe->off holds how many events that need to occur for this
6222 * timeout event to be satisfied. If it isn't set, then this is
6223 * a pure timeout request, sequence isn't used.
6225 if (io_is_timeout_noseq(req)) {
6226 entry = ctx->timeout_list.prev;
6230 tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
6231 req->timeout.target_seq = tail + off;
6233 /* Update the last seq here in case io_flush_timeouts() hasn't.
6234 * This is safe because ->completion_lock is held, and submissions
6235 * and completions are never mixed in the same ->completion_lock section.
6237 ctx->cq_last_tm_flush = tail;
6240 * Insertion sort, ensuring the first entry in the list is always
6241 * the one we need first.
6243 list_for_each_prev(entry, &ctx->timeout_list) {
6244 struct io_kiocb *nxt = list_entry(entry, struct io_kiocb,
6247 if (io_is_timeout_noseq(nxt))
6249 /* nxt.seq is behind @tail, otherwise would've been completed */
6250 if (off >= nxt->timeout.target_seq - tail)
6254 list_add(&req->timeout.list, entry);
6255 data->timer.function = io_timeout_fn;
6256 hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode);
6257 spin_unlock_irq(&ctx->timeout_lock);
6261 struct io_cancel_data {
6262 struct io_ring_ctx *ctx;
6266 static bool io_cancel_cb(struct io_wq_work *work, void *data)
6268 struct io_kiocb *req = container_of(work, struct io_kiocb, work);
6269 struct io_cancel_data *cd = data;
6271 return req->ctx == cd->ctx && req->user_data == cd->user_data;
6274 static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data,
6275 struct io_ring_ctx *ctx)
6277 struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, };
6278 enum io_wq_cancel cancel_ret;
6281 if (!tctx || !tctx->io_wq)
6284 cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false);
6285 switch (cancel_ret) {
6286 case IO_WQ_CANCEL_OK:
6289 case IO_WQ_CANCEL_RUNNING:
6292 case IO_WQ_CANCEL_NOTFOUND:
6300 static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr)
6302 struct io_ring_ctx *ctx = req->ctx;
6305 WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current);
6307 ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx);
6311 spin_lock(&ctx->completion_lock);
6312 spin_lock_irq(&ctx->timeout_lock);
6313 ret = io_timeout_cancel(ctx, sqe_addr);
6314 spin_unlock_irq(&ctx->timeout_lock);
6317 ret = io_poll_cancel(ctx, sqe_addr, false);
6319 spin_unlock(&ctx->completion_lock);
6323 static int io_async_cancel_prep(struct io_kiocb *req,
6324 const struct io_uring_sqe *sqe)
6326 if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
6328 if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
6330 if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags ||
6334 req->cancel.addr = READ_ONCE(sqe->addr);
6338 static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags)
6340 struct io_ring_ctx *ctx = req->ctx;
6341 u64 sqe_addr = req->cancel.addr;
6342 struct io_tctx_node *node;
6345 ret = io_try_cancel_userdata(req, sqe_addr);
6349 /* slow path, try all io-wq's */
6350 io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
6352 list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
6353 struct io_uring_task *tctx = node->task->io_uring;
6355 ret = io_async_cancel_one(tctx, req->cancel.addr, ctx);
6359 io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
6363 io_req_complete_post(req, ret, 0);
6367 static int io_rsrc_update_prep(struct io_kiocb *req,
6368 const struct io_uring_sqe *sqe)
6370 if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
6372 if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in)
6375 req->rsrc_update.offset = READ_ONCE(sqe->off);
6376 req->rsrc_update.nr_args = READ_ONCE(sqe->len);
6377 if (!req->rsrc_update.nr_args)
6379 req->rsrc_update.arg = READ_ONCE(sqe->addr);
6383 static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
6385 struct io_ring_ctx *ctx = req->ctx;
6386 struct io_uring_rsrc_update2 up;
6389 up.offset = req->rsrc_update.offset;
6390 up.data = req->rsrc_update.arg;
6395 io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
6396 ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
6397 &up, req->rsrc_update.nr_args);
6398 io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
6402 __io_req_complete(req, issue_flags, ret, 0);
6406 static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
6408 switch (req->opcode) {
6411 case IORING_OP_READV:
6412 case IORING_OP_READ_FIXED:
6413 case IORING_OP_READ:
6414 return io_read_prep(req, sqe);
6415 case IORING_OP_WRITEV:
6416 case IORING_OP_WRITE_FIXED:
6417 case IORING_OP_WRITE:
6418 return io_write_prep(req, sqe);
6419 case IORING_OP_POLL_ADD:
6420 return io_poll_add_prep(req, sqe);
6421 case IORING_OP_POLL_REMOVE:
6422 return io_poll_update_prep(req, sqe);
6423 case IORING_OP_FSYNC:
6424 return io_fsync_prep(req, sqe);
6425 case IORING_OP_SYNC_FILE_RANGE:
6426 return io_sfr_prep(req, sqe);
6427 case IORING_OP_SENDMSG:
6428 case IORING_OP_SEND:
6429 return io_sendmsg_prep(req, sqe);
6430 case IORING_OP_RECVMSG:
6431 case IORING_OP_RECV:
6432 return io_recvmsg_prep(req, sqe);
6433 case IORING_OP_CONNECT:
6434 return io_connect_prep(req, sqe);
6435 case IORING_OP_TIMEOUT:
6436 return io_timeout_prep(req, sqe, false);
6437 case IORING_OP_TIMEOUT_REMOVE:
6438 return io_timeout_remove_prep(req, sqe);
6439 case IORING_OP_ASYNC_CANCEL:
6440 return io_async_cancel_prep(req, sqe);
6441 case IORING_OP_LINK_TIMEOUT:
6442 return io_timeout_prep(req, sqe, true);
6443 case IORING_OP_ACCEPT:
6444 return io_accept_prep(req, sqe);
6445 case IORING_OP_FALLOCATE:
6446 return io_fallocate_prep(req, sqe);
6447 case IORING_OP_OPENAT:
6448 return io_openat_prep(req, sqe);
6449 case IORING_OP_CLOSE:
6450 return io_close_prep(req, sqe);
6451 case IORING_OP_FILES_UPDATE:
6452 return io_rsrc_update_prep(req, sqe);
6453 case IORING_OP_STATX:
6454 return io_statx_prep(req, sqe);
6455 case IORING_OP_FADVISE:
6456 return io_fadvise_prep(req, sqe);
6457 case IORING_OP_MADVISE:
6458 return io_madvise_prep(req, sqe);
6459 case IORING_OP_OPENAT2:
6460 return io_openat2_prep(req, sqe);
6461 case IORING_OP_EPOLL_CTL:
6462 return io_epoll_ctl_prep(req, sqe);
6463 case IORING_OP_SPLICE:
6464 return io_splice_prep(req, sqe);
6465 case IORING_OP_PROVIDE_BUFFERS:
6466 return io_provide_buffers_prep(req, sqe);
6467 case IORING_OP_REMOVE_BUFFERS:
6468 return io_remove_buffers_prep(req, sqe);
6470 return io_tee_prep(req, sqe);
6471 case IORING_OP_SHUTDOWN:
6472 return io_shutdown_prep(req, sqe);
6473 case IORING_OP_RENAMEAT:
6474 return io_renameat_prep(req, sqe);
6475 case IORING_OP_UNLINKAT:
6476 return io_unlinkat_prep(req, sqe);
6477 case IORING_OP_MKDIRAT:
6478 return io_mkdirat_prep(req, sqe);
6479 case IORING_OP_SYMLINKAT:
6480 return io_symlinkat_prep(req, sqe);
6481 case IORING_OP_LINKAT:
6482 return io_linkat_prep(req, sqe);
6485 printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
6490 static int io_req_prep_async(struct io_kiocb *req)
6492 if (!io_op_defs[req->opcode].needs_async_setup)
6494 if (WARN_ON_ONCE(req->async_data))
6496 if (io_alloc_async_data(req))
6499 switch (req->opcode) {
6500 case IORING_OP_READV:
6501 return io_rw_prep_async(req, READ);
6502 case IORING_OP_WRITEV:
6503 return io_rw_prep_async(req, WRITE);
6504 case IORING_OP_SENDMSG:
6505 return io_sendmsg_prep_async(req);
6506 case IORING_OP_RECVMSG:
6507 return io_recvmsg_prep_async(req);
6508 case IORING_OP_CONNECT:
6509 return io_connect_prep_async(req);
6511 printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n",
6516 static u32 io_get_sequence(struct io_kiocb *req)
6518 u32 seq = req->ctx->cached_sq_head;
6520 /* need original cached_sq_head, but it was increased for each req */
6521 io_for_each_link(req, req)
6526 static bool io_drain_req(struct io_kiocb *req)
6528 struct io_kiocb *pos;
6529 struct io_ring_ctx *ctx = req->ctx;
6530 struct io_defer_entry *de;
6534 if (req->flags & REQ_F_FAIL) {
6535 io_req_complete_fail_submit(req);
6540 * If we need to drain a request in the middle of a link, drain the
6541 * head request and the next request/link after the current link.
6542 * Considering sequential execution of links, IOSQE_IO_DRAIN will be
6543 * maintained for every request of our link.
6545 if (ctx->drain_next) {
6546 req->flags |= REQ_F_IO_DRAIN;
6547 ctx->drain_next = false;
6549 /* not interested in head, start from the first linked */
6550 io_for_each_link(pos, req->link) {
6551 if (pos->flags & REQ_F_IO_DRAIN) {
6552 ctx->drain_next = true;
6553 req->flags |= REQ_F_IO_DRAIN;
6558 /* Still need defer if there is pending req in defer list. */
6559 if (likely(list_empty_careful(&ctx->defer_list) &&
6560 !(req->flags & REQ_F_IO_DRAIN))) {
6561 ctx->drain_active = false;
6565 seq = io_get_sequence(req);
6566 /* Still a chance to pass the sequence check */
6567 if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list))
6570 ret = io_req_prep_async(req);
6573 io_prep_async_link(req);
6574 de = kmalloc(sizeof(*de), GFP_KERNEL);
6578 io_req_complete_failed(req, ret);
6582 spin_lock(&ctx->completion_lock);
6583 if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) {
6584 spin_unlock(&ctx->completion_lock);
6586 io_queue_async_work(req, NULL);
6590 trace_io_uring_defer(ctx, req, req->user_data);
6593 list_add_tail(&de->list, &ctx->defer_list);
6594 spin_unlock(&ctx->completion_lock);
6598 static void io_clean_op(struct io_kiocb *req)
6600 if (req->flags & REQ_F_BUFFER_SELECTED) {
6601 switch (req->opcode) {
6602 case IORING_OP_READV:
6603 case IORING_OP_READ_FIXED:
6604 case IORING_OP_READ:
6605 kfree((void *)(unsigned long)req->rw.addr);
6607 case IORING_OP_RECVMSG:
6608 case IORING_OP_RECV:
6609 kfree(req->sr_msg.kbuf);
6614 if (req->flags & REQ_F_NEED_CLEANUP) {
6615 switch (req->opcode) {
6616 case IORING_OP_READV:
6617 case IORING_OP_READ_FIXED:
6618 case IORING_OP_READ:
6619 case IORING_OP_WRITEV:
6620 case IORING_OP_WRITE_FIXED:
6621 case IORING_OP_WRITE: {
6622 struct io_async_rw *io = req->async_data;
6624 kfree(io->free_iovec);
6627 case IORING_OP_RECVMSG:
6628 case IORING_OP_SENDMSG: {
6629 struct io_async_msghdr *io = req->async_data;
6631 kfree(io->free_iov);
6634 case IORING_OP_SPLICE:
6636 if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED))
6637 io_put_file(req->splice.file_in);
6639 case IORING_OP_OPENAT:
6640 case IORING_OP_OPENAT2:
6641 if (req->open.filename)
6642 putname(req->open.filename);
6644 case IORING_OP_RENAMEAT:
6645 putname(req->rename.oldpath);
6646 putname(req->rename.newpath);
6648 case IORING_OP_UNLINKAT:
6649 putname(req->unlink.filename);
6651 case IORING_OP_MKDIRAT:
6652 putname(req->mkdir.filename);
6654 case IORING_OP_SYMLINKAT:
6655 putname(req->symlink.oldpath);
6656 putname(req->symlink.newpath);
6658 case IORING_OP_LINKAT:
6659 putname(req->hardlink.oldpath);
6660 putname(req->hardlink.newpath);
6664 if ((req->flags & REQ_F_POLLED) && req->apoll) {
6665 kfree(req->apoll->double_poll);
6669 if (req->flags & REQ_F_INFLIGHT) {
6670 struct io_uring_task *tctx = req->task->io_uring;
6672 atomic_dec(&tctx->inflight_tracked);
6674 if (req->flags & REQ_F_CREDS)
6675 put_cred(req->creds);
6677 req->flags &= ~IO_REQ_CLEAN_FLAGS;
6680 static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
6682 struct io_ring_ctx *ctx = req->ctx;
6683 const struct cred *creds = NULL;
6686 if ((req->flags & REQ_F_CREDS) && req->creds != current_cred())
6687 creds = override_creds(req->creds);
6689 switch (req->opcode) {
6691 ret = io_nop(req, issue_flags);
6693 case IORING_OP_READV:
6694 case IORING_OP_READ_FIXED:
6695 case IORING_OP_READ:
6696 ret = io_read(req, issue_flags);
6698 case IORING_OP_WRITEV:
6699 case IORING_OP_WRITE_FIXED:
6700 case IORING_OP_WRITE:
6701 ret = io_write(req, issue_flags);
6703 case IORING_OP_FSYNC:
6704 ret = io_fsync(req, issue_flags);
6706 case IORING_OP_POLL_ADD:
6707 ret = io_poll_add(req, issue_flags);
6709 case IORING_OP_POLL_REMOVE:
6710 ret = io_poll_update(req, issue_flags);
6712 case IORING_OP_SYNC_FILE_RANGE:
6713 ret = io_sync_file_range(req, issue_flags);
6715 case IORING_OP_SENDMSG:
6716 ret = io_sendmsg(req, issue_flags);
6718 case IORING_OP_SEND:
6719 ret = io_send(req, issue_flags);
6721 case IORING_OP_RECVMSG:
6722 ret = io_recvmsg(req, issue_flags);
6724 case IORING_OP_RECV:
6725 ret = io_recv(req, issue_flags);
6727 case IORING_OP_TIMEOUT:
6728 ret = io_timeout(req, issue_flags);
6730 case IORING_OP_TIMEOUT_REMOVE:
6731 ret = io_timeout_remove(req, issue_flags);
6733 case IORING_OP_ACCEPT:
6734 ret = io_accept(req, issue_flags);
6736 case IORING_OP_CONNECT:
6737 ret = io_connect(req, issue_flags);
6739 case IORING_OP_ASYNC_CANCEL:
6740 ret = io_async_cancel(req, issue_flags);
6742 case IORING_OP_FALLOCATE:
6743 ret = io_fallocate(req, issue_flags);
6745 case IORING_OP_OPENAT:
6746 ret = io_openat(req, issue_flags);
6748 case IORING_OP_CLOSE:
6749 ret = io_close(req, issue_flags);
6751 case IORING_OP_FILES_UPDATE:
6752 ret = io_files_update(req, issue_flags);
6754 case IORING_OP_STATX:
6755 ret = io_statx(req, issue_flags);
6757 case IORING_OP_FADVISE:
6758 ret = io_fadvise(req, issue_flags);
6760 case IORING_OP_MADVISE:
6761 ret = io_madvise(req, issue_flags);
6763 case IORING_OP_OPENAT2:
6764 ret = io_openat2(req, issue_flags);
6766 case IORING_OP_EPOLL_CTL:
6767 ret = io_epoll_ctl(req, issue_flags);
6769 case IORING_OP_SPLICE:
6770 ret = io_splice(req, issue_flags);
6772 case IORING_OP_PROVIDE_BUFFERS:
6773 ret = io_provide_buffers(req, issue_flags);
6775 case IORING_OP_REMOVE_BUFFERS:
6776 ret = io_remove_buffers(req, issue_flags);
6779 ret = io_tee(req, issue_flags);
6781 case IORING_OP_SHUTDOWN:
6782 ret = io_shutdown(req, issue_flags);
6784 case IORING_OP_RENAMEAT:
6785 ret = io_renameat(req, issue_flags);
6787 case IORING_OP_UNLINKAT:
6788 ret = io_unlinkat(req, issue_flags);
6790 case IORING_OP_MKDIRAT:
6791 ret = io_mkdirat(req, issue_flags);
6793 case IORING_OP_SYMLINKAT:
6794 ret = io_symlinkat(req, issue_flags);
6796 case IORING_OP_LINKAT:
6797 ret = io_linkat(req, issue_flags);
6805 revert_creds(creds);
6808 /* If the op doesn't have a file, we're not polling for it */
6809 if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file)
6810 io_iopoll_req_issued(req);
6815 static struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
6817 struct io_kiocb *req = container_of(work, struct io_kiocb, work);
6819 req = io_put_req_find_next(req);
6820 return req ? &req->work : NULL;
6823 static void io_wq_submit_work(struct io_wq_work *work)
6825 struct io_kiocb *req = container_of(work, struct io_kiocb, work);
6826 struct io_kiocb *timeout;
6829 /* one will be dropped by ->io_free_work() after returning to io-wq */
6830 if (!(req->flags & REQ_F_REFCOUNT))
6831 __io_req_set_refcount(req, 2);
6835 timeout = io_prep_linked_timeout(req);
6837 io_queue_linked_timeout(timeout);
6839 /* either cancelled or io-wq is dying, so don't touch tctx->iowq */
6840 if (work->flags & IO_WQ_WORK_CANCEL)
6845 ret = io_issue_sqe(req, 0);
6847 * We can get EAGAIN for polled IO even though we're
6848 * forcing a sync submission from here, since we can't
6849 * wait for request slots on the block side.
6857 /* avoid locking problems by failing it from a clean context */
6859 io_req_task_queue_fail(req, ret);
6862 static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table,
6865 return &table->files[i];
6868 static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
6871 struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index);
6873 return (struct file *) (slot->file_ptr & FFS_MASK);
6876 static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file)
6878 unsigned long file_ptr = (unsigned long) file;
6880 if (__io_file_supports_nowait(file, READ))
6881 file_ptr |= FFS_ASYNC_READ;
6882 if (__io_file_supports_nowait(file, WRITE))
6883 file_ptr |= FFS_ASYNC_WRITE;
6884 if (S_ISREG(file_inode(file)->i_mode))
6885 file_ptr |= FFS_ISREG;
6886 file_slot->file_ptr = file_ptr;
6889 static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx,
6890 struct io_kiocb *req, int fd)
6893 unsigned long file_ptr;
6895 if (unlikely((unsigned int)fd >= ctx->nr_user_files))
6897 fd = array_index_nospec(fd, ctx->nr_user_files);
6898 file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr;
6899 file = (struct file *) (file_ptr & FFS_MASK);
6900 file_ptr &= ~FFS_MASK;
6901 /* mask in overlapping REQ_F and FFS bits */
6902 req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT);
6903 io_req_set_rsrc_node(req);
6907 static struct file *io_file_get_normal(struct io_ring_ctx *ctx,
6908 struct io_kiocb *req, int fd)
6910 struct file *file = fget(fd);
6912 trace_io_uring_file_get(ctx, fd);
6914 /* we don't allow fixed io_uring files */
6915 if (file && unlikely(file->f_op == &io_uring_fops))
6916 io_req_track_inflight(req);
6920 static inline struct file *io_file_get(struct io_ring_ctx *ctx,
6921 struct io_kiocb *req, int fd, bool fixed)
6924 return io_file_get_fixed(ctx, req, fd);
6926 return io_file_get_normal(ctx, req, fd);
6929 static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked)
6931 struct io_kiocb *prev = req->timeout.prev;
6935 if (!(req->task->flags & PF_EXITING))
6936 ret = io_try_cancel_userdata(req, prev->user_data);
6937 io_req_complete_post(req, ret ?: -ETIME, 0);
6940 io_req_complete_post(req, -ETIME, 0);
6944 static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
6946 struct io_timeout_data *data = container_of(timer,
6947 struct io_timeout_data, timer);
6948 struct io_kiocb *prev, *req = data->req;
6949 struct io_ring_ctx *ctx = req->ctx;
6950 unsigned long flags;
6952 spin_lock_irqsave(&ctx->timeout_lock, flags);
6953 prev = req->timeout.head;
6954 req->timeout.head = NULL;
6957 * We don't expect the list to be empty, that will only happen if we
6958 * race with the completion of the linked work.
6961 io_remove_next_linked(prev);
6962 if (!req_ref_inc_not_zero(prev))
6965 list_del(&req->timeout.list);
6966 req->timeout.prev = prev;
6967 spin_unlock_irqrestore(&ctx->timeout_lock, flags);
6969 req->io_task_work.func = io_req_task_link_timeout;
6970 io_req_task_work_add(req);
6971 return HRTIMER_NORESTART;
6974 static void io_queue_linked_timeout(struct io_kiocb *req)
6976 struct io_ring_ctx *ctx = req->ctx;
6978 spin_lock_irq(&ctx->timeout_lock);
6980 * If the back reference is NULL, then our linked request finished
6981 * before we got a chance to setup the timer
6983 if (req->timeout.head) {
6984 struct io_timeout_data *data = req->async_data;
6986 data->timer.function = io_link_timeout_fn;
6987 hrtimer_start(&data->timer, timespec64_to_ktime(data->ts),
6989 list_add_tail(&req->timeout.list, &ctx->ltimeout_list);
6991 spin_unlock_irq(&ctx->timeout_lock);
6992 /* drop submission reference */
6996 static void __io_queue_sqe(struct io_kiocb *req)
6997 __must_hold(&req->ctx->uring_lock)
6999 struct io_kiocb *linked_timeout;
7003 ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER);
7006 * We async punt it if the file wasn't marked NOWAIT, or if the file
7007 * doesn't support non-blocking read/write attempts
7010 if (req->flags & REQ_F_COMPLETE_INLINE) {
7011 struct io_ring_ctx *ctx = req->ctx;
7012 struct io_submit_state *state = &ctx->submit_state;
7014 state->compl_reqs[state->compl_nr++] = req;
7015 if (state->compl_nr == ARRAY_SIZE(state->compl_reqs))
7016 io_submit_flush_completions(ctx);
7020 linked_timeout = io_prep_linked_timeout(req);
7022 io_queue_linked_timeout(linked_timeout);
7023 } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
7024 linked_timeout = io_prep_linked_timeout(req);
7026 switch (io_arm_poll_handler(req)) {
7027 case IO_APOLL_READY:
7029 io_queue_linked_timeout(linked_timeout);
7031 case IO_APOLL_ABORTED:
7033 * Queued up for async execution, worker will release
7034 * submit reference when the iocb is actually submitted.
7036 io_queue_async_work(req, NULL);
7041 io_queue_linked_timeout(linked_timeout);
7043 io_req_complete_failed(req, ret);
7047 static inline void io_queue_sqe(struct io_kiocb *req)
7048 __must_hold(&req->ctx->uring_lock)
7050 if (unlikely(req->ctx->drain_active) && io_drain_req(req))
7053 if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) {
7054 __io_queue_sqe(req);
7055 } else if (req->flags & REQ_F_FAIL) {
7056 io_req_complete_fail_submit(req);
7058 int ret = io_req_prep_async(req);
7061 io_req_complete_failed(req, ret);
7063 io_queue_async_work(req, NULL);
7068 * Check SQE restrictions (opcode and flags).
7070 * Returns 'true' if SQE is allowed, 'false' otherwise.
7072 static inline bool io_check_restriction(struct io_ring_ctx *ctx,
7073 struct io_kiocb *req,
7074 unsigned int sqe_flags)
7076 if (likely(!ctx->restricted))
7079 if (!test_bit(req->opcode, ctx->restrictions.sqe_op))
7082 if ((sqe_flags & ctx->restrictions.sqe_flags_required) !=
7083 ctx->restrictions.sqe_flags_required)
7086 if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed |
7087 ctx->restrictions.sqe_flags_required))
7093 static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
7094 const struct io_uring_sqe *sqe)
7095 __must_hold(&ctx->uring_lock)
7097 struct io_submit_state *state;
7098 unsigned int sqe_flags;
7099 int personality, ret = 0;
7101 /* req is partially pre-initialised, see io_preinit_req() */
7102 req->opcode = READ_ONCE(sqe->opcode);
7103 /* same numerical values with corresponding REQ_F_*, safe to copy */
7104 req->flags = sqe_flags = READ_ONCE(sqe->flags);
7105 req->user_data = READ_ONCE(sqe->user_data);
7107 req->fixed_rsrc_refs = NULL;
7108 req->task = current;
7110 /* enforce forwards compatibility on users */
7111 if (unlikely(sqe_flags & ~SQE_VALID_FLAGS))
7113 if (unlikely(req->opcode >= IORING_OP_LAST))
7115 if (!io_check_restriction(ctx, req, sqe_flags))
7118 if ((sqe_flags & IOSQE_BUFFER_SELECT) &&
7119 !io_op_defs[req->opcode].buffer_select)
7121 if (unlikely(sqe_flags & IOSQE_IO_DRAIN))
7122 ctx->drain_active = true;
7124 personality = READ_ONCE(sqe->personality);
7126 req->creds = xa_load(&ctx->personalities, personality);
7129 get_cred(req->creds);
7130 req->flags |= REQ_F_CREDS;
7132 state = &ctx->submit_state;
7135 * Plug now if we have more than 1 IO left after this, and the target
7136 * is potentially a read/write to block based storage.
7138 if (!state->plug_started && state->ios_left > 1 &&
7139 io_op_defs[req->opcode].plug) {
7140 blk_start_plug(&state->plug);
7141 state->plug_started = true;
7144 if (io_op_defs[req->opcode].needs_file) {
7145 req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd),
7146 (sqe_flags & IOSQE_FIXED_FILE));
7147 if (unlikely(!req->file))
7155 static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
7156 const struct io_uring_sqe *sqe)
7157 __must_hold(&ctx->uring_lock)
7159 struct io_submit_link *link = &ctx->submit_state.link;
7162 ret = io_init_req(ctx, req, sqe);
7163 if (unlikely(ret)) {
7165 /* fail even hard links since we don't submit */
7168 * we can judge a link req is failed or cancelled by if
7169 * REQ_F_FAIL is set, but the head is an exception since
7170 * it may be set REQ_F_FAIL because of other req's failure
7171 * so let's leverage req->result to distinguish if a head
7172 * is set REQ_F_FAIL because of its failure or other req's
7173 * failure so that we can set the correct ret code for it.
7174 * init result here to avoid affecting the normal path.
7176 if (!(link->head->flags & REQ_F_FAIL))
7177 req_fail_link_node(link->head, -ECANCELED);
7178 } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
7180 * the current req is a normal req, we should return
7181 * error and thus break the submittion loop.
7183 io_req_complete_failed(req, ret);
7186 req_fail_link_node(req, ret);
7188 ret = io_req_prep(req, sqe);
7193 /* don't need @sqe from now on */
7194 trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data,
7196 ctx->flags & IORING_SETUP_SQPOLL);
7199 * If we already have a head request, queue this one for async
7200 * submittal once the head completes. If we don't have a head but
7201 * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be
7202 * submitted sync once the chain is complete. If none of those
7203 * conditions are true (normal request), then just queue it.
7206 struct io_kiocb *head = link->head;
7208 if (!(req->flags & REQ_F_FAIL)) {
7209 ret = io_req_prep_async(req);
7210 if (unlikely(ret)) {
7211 req_fail_link_node(req, ret);
7212 if (!(head->flags & REQ_F_FAIL))
7213 req_fail_link_node(head, -ECANCELED);
7216 trace_io_uring_link(ctx, req, head);
7217 link->last->link = req;
7220 /* last request of a link, enqueue the link */
7221 if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
7226 if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
7238 * Batched submission is done, ensure local IO is flushed out.
7240 static void io_submit_state_end(struct io_submit_state *state,
7241 struct io_ring_ctx *ctx)
7243 if (state->link.head)
7244 io_queue_sqe(state->link.head);
7245 if (state->compl_nr)
7246 io_submit_flush_completions(ctx);
7247 if (state->plug_started)
7248 blk_finish_plug(&state->plug);
7252 * Start submission side cache.
7254 static void io_submit_state_start(struct io_submit_state *state,
7255 unsigned int max_ios)
7257 state->plug_started = false;
7258 state->ios_left = max_ios;
7259 /* set only head, no need to init link_last in advance */
7260 state->link.head = NULL;
7263 static void io_commit_sqring(struct io_ring_ctx *ctx)
7265 struct io_rings *rings = ctx->rings;
7268 * Ensure any loads from the SQEs are done at this point,
7269 * since once we write the new head, the application could
7270 * write new data to them.
7272 smp_store_release(&rings->sq.head, ctx->cached_sq_head);
7276 * Fetch an sqe, if one is available. Note this returns a pointer to memory
7277 * that is mapped by userspace. This means that care needs to be taken to
7278 * ensure that reads are stable, as we cannot rely on userspace always
7279 * being a good citizen. If members of the sqe are validated and then later
7280 * used, it's important that those reads are done through READ_ONCE() to
7281 * prevent a re-load down the line.
7283 static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
7285 unsigned head, mask = ctx->sq_entries - 1;
7286 unsigned sq_idx = ctx->cached_sq_head++ & mask;
7289 * The cached sq head (or cq tail) serves two purposes:
7291 * 1) allows us to batch the cost of updating the user visible
7293 * 2) allows the kernel side to track the head on its own, even
7294 * though the application is the one updating it.
7296 head = READ_ONCE(ctx->sq_array[sq_idx]);
7297 if (likely(head < ctx->sq_entries))
7298 return &ctx->sq_sqes[head];
7300 /* drop invalid entries */
7302 WRITE_ONCE(ctx->rings->sq_dropped,
7303 READ_ONCE(ctx->rings->sq_dropped) + 1);
7307 static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
7308 __must_hold(&ctx->uring_lock)
7312 /* make sure SQ entry isn't read before tail */
7313 nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx));
7314 if (!percpu_ref_tryget_many(&ctx->refs, nr))
7316 io_get_task_refs(nr);
7318 io_submit_state_start(&ctx->submit_state, nr);
7319 while (submitted < nr) {
7320 const struct io_uring_sqe *sqe;
7321 struct io_kiocb *req;
7323 req = io_alloc_req(ctx);
7324 if (unlikely(!req)) {
7326 submitted = -EAGAIN;
7329 sqe = io_get_sqe(ctx);
7330 if (unlikely(!sqe)) {
7331 list_add(&req->inflight_entry, &ctx->submit_state.free_list);
7334 /* will complete beyond this point, count as submitted */
7336 if (io_submit_sqe(ctx, req, sqe))
7340 if (unlikely(submitted != nr)) {
7341 int ref_used = (submitted == -EAGAIN) ? 0 : submitted;
7342 int unused = nr - ref_used;
7344 current->io_uring->cached_refs += unused;
7345 percpu_ref_put_many(&ctx->refs, unused);
7348 io_submit_state_end(&ctx->submit_state, ctx);
7349 /* Commit SQ ring head once we've consumed and submitted all SQEs */
7350 io_commit_sqring(ctx);
7355 static inline bool io_sqd_events_pending(struct io_sq_data *sqd)
7357 return READ_ONCE(sqd->state);
7360 static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx)
7362 /* Tell userspace we may need a wakeup call */
7363 spin_lock(&ctx->completion_lock);
7364 WRITE_ONCE(ctx->rings->sq_flags,
7365 ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP);
7366 spin_unlock(&ctx->completion_lock);
7369 static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx)
7371 spin_lock(&ctx->completion_lock);
7372 WRITE_ONCE(ctx->rings->sq_flags,
7373 ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP);
7374 spin_unlock(&ctx->completion_lock);
7377 static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
7379 unsigned int to_submit;
7382 to_submit = io_sqring_entries(ctx);
7383 /* if we're handling multiple rings, cap submit size for fairness */
7384 if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE)
7385 to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE;
7387 if (!list_empty(&ctx->iopoll_list) || to_submit) {
7388 unsigned nr_events = 0;
7389 const struct cred *creds = NULL;
7391 if (ctx->sq_creds != current_cred())
7392 creds = override_creds(ctx->sq_creds);
7394 mutex_lock(&ctx->uring_lock);
7395 if (!list_empty(&ctx->iopoll_list))
7396 io_do_iopoll(ctx, &nr_events, 0);
7399 * Don't submit if refs are dying, good for io_uring_register(),
7400 * but also it is relied upon by io_ring_exit_work()
7402 if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) &&
7403 !(ctx->flags & IORING_SETUP_R_DISABLED))
7404 ret = io_submit_sqes(ctx, to_submit);
7405 mutex_unlock(&ctx->uring_lock);
7407 if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait))
7408 wake_up(&ctx->sqo_sq_wait);
7410 revert_creds(creds);
7416 static void io_sqd_update_thread_idle(struct io_sq_data *sqd)
7418 struct io_ring_ctx *ctx;
7419 unsigned sq_thread_idle = 0;
7421 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
7422 sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle);
7423 sqd->sq_thread_idle = sq_thread_idle;
7426 static bool io_sqd_handle_event(struct io_sq_data *sqd)
7428 bool did_sig = false;
7429 struct ksignal ksig;
7431 if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) ||
7432 signal_pending(current)) {
7433 mutex_unlock(&sqd->lock);
7434 if (signal_pending(current))
7435 did_sig = get_signal(&ksig);
7437 mutex_lock(&sqd->lock);
7439 return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state);
7442 static int io_sq_thread(void *data)
7444 struct io_sq_data *sqd = data;
7445 struct io_ring_ctx *ctx;
7446 unsigned long timeout = 0;
7447 char buf[TASK_COMM_LEN];
7450 snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid);
7451 set_task_comm(current, buf);
7453 if (sqd->sq_cpu != -1)
7454 set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu));
7456 set_cpus_allowed_ptr(current, cpu_online_mask);
7457 current->flags |= PF_NO_SETAFFINITY;
7459 mutex_lock(&sqd->lock);
7461 bool cap_entries, sqt_spin = false;
7463 if (io_sqd_events_pending(sqd) || signal_pending(current)) {
7464 if (io_sqd_handle_event(sqd))
7466 timeout = jiffies + sqd->sq_thread_idle;
7469 cap_entries = !list_is_singular(&sqd->ctx_list);
7470 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
7471 int ret = __io_sq_thread(ctx, cap_entries);
7473 if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list)))
7476 if (io_run_task_work())
7479 if (sqt_spin || !time_after(jiffies, timeout)) {
7482 timeout = jiffies + sqd->sq_thread_idle;
7486 prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE);
7487 if (!io_sqd_events_pending(sqd) && !current->task_works) {
7488 bool needs_sched = true;
7490 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
7491 io_ring_set_wakeup_flag(ctx);
7493 if ((ctx->flags & IORING_SETUP_IOPOLL) &&
7494 !list_empty_careful(&ctx->iopoll_list)) {
7495 needs_sched = false;
7498 if (io_sqring_entries(ctx)) {
7499 needs_sched = false;
7505 mutex_unlock(&sqd->lock);
7507 mutex_lock(&sqd->lock);
7509 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
7510 io_ring_clear_wakeup_flag(ctx);
7513 finish_wait(&sqd->wait, &wait);
7514 timeout = jiffies + sqd->sq_thread_idle;
7517 io_uring_cancel_generic(true, sqd);
7519 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
7520 io_ring_set_wakeup_flag(ctx);
7522 mutex_unlock(&sqd->lock);
7524 complete(&sqd->exited);
7528 struct io_wait_queue {
7529 struct wait_queue_entry wq;
7530 struct io_ring_ctx *ctx;
7532 unsigned nr_timeouts;
7535 static inline bool io_should_wake(struct io_wait_queue *iowq)
7537 struct io_ring_ctx *ctx = iowq->ctx;
7538 int dist = ctx->cached_cq_tail - (int) iowq->cq_tail;
7541 * Wake up if we have enough events, or if a timeout occurred since we
7542 * started waiting. For timeouts, we always want to return to userspace,
7543 * regardless of event count.
7545 return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
7548 static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
7549 int wake_flags, void *key)
7551 struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue,
7555 * Cannot safely flush overflowed CQEs from here, ensure we wake up
7556 * the task, and the next invocation will do it.
7558 if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow))
7559 return autoremove_wake_function(curr, mode, wake_flags, key);
7563 static int io_run_task_work_sig(void)
7565 if (io_run_task_work())
7567 if (!signal_pending(current))
7569 if (test_thread_flag(TIF_NOTIFY_SIGNAL))
7570 return -ERESTARTSYS;
7574 /* when returns >0, the caller should retry */
7575 static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
7576 struct io_wait_queue *iowq,
7577 signed long *timeout)
7581 /* make sure we run task_work before checking for signals */
7582 ret = io_run_task_work_sig();
7583 if (ret || io_should_wake(iowq))
7585 /* let the caller flush overflows, retry */
7586 if (test_bit(0, &ctx->check_cq_overflow))
7589 *timeout = schedule_timeout(*timeout);
7590 return !*timeout ? -ETIME : 1;
7594 * Wait until events become available, if we don't already have some. The
7595 * application must reap them itself, as they reside on the shared cq ring.
7597 static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
7598 const sigset_t __user *sig, size_t sigsz,
7599 struct __kernel_timespec __user *uts)
7601 struct io_wait_queue iowq;
7602 struct io_rings *rings = ctx->rings;
7603 signed long timeout = MAX_SCHEDULE_TIMEOUT;
7607 io_cqring_overflow_flush(ctx);
7608 if (io_cqring_events(ctx) >= min_events)
7610 if (!io_run_task_work())
7615 struct timespec64 ts;
7617 if (get_timespec64(&ts, uts))
7619 timeout = timespec64_to_jiffies(&ts);
7623 #ifdef CONFIG_COMPAT
7624 if (in_compat_syscall())
7625 ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
7629 ret = set_user_sigmask(sig, sigsz);
7635 init_waitqueue_func_entry(&iowq.wq, io_wake_function);
7636 iowq.wq.private = current;
7637 INIT_LIST_HEAD(&iowq.wq.entry);
7639 iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
7640 iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
7642 trace_io_uring_cqring_wait(ctx, min_events);
7644 /* if we can't even flush overflow, don't wait for more */
7645 if (!io_cqring_overflow_flush(ctx)) {
7649 prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq,
7650 TASK_INTERRUPTIBLE);
7651 ret = io_cqring_wait_schedule(ctx, &iowq, &timeout);
7652 finish_wait(&ctx->cq_wait, &iowq.wq);
7656 restore_saved_sigmask_unless(ret == -EINTR);
7658 return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
7661 static void io_free_page_table(void **table, size_t size)
7663 unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
7665 for (i = 0; i < nr_tables; i++)
7670 static void **io_alloc_page_table(size_t size)
7672 unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
7673 size_t init_size = size;
7676 table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT);
7680 for (i = 0; i < nr_tables; i++) {
7681 unsigned int this_size = min_t(size_t, size, PAGE_SIZE);
7683 table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT);
7685 io_free_page_table(table, init_size);
7693 static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node)
7695 percpu_ref_exit(&ref_node->refs);
7699 static void io_rsrc_node_ref_zero(struct percpu_ref *ref)
7701 struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs);
7702 struct io_ring_ctx *ctx = node->rsrc_data->ctx;
7703 unsigned long flags;
7704 bool first_add = false;
7706 spin_lock_irqsave(&ctx->rsrc_ref_lock, flags);
7709 while (!list_empty(&ctx->rsrc_ref_list)) {
7710 node = list_first_entry(&ctx->rsrc_ref_list,
7711 struct io_rsrc_node, node);
7712 /* recycle ref nodes in order */
7715 list_del(&node->node);
7716 first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist);
7718 spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags);
7721 mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ);
7724 static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx)
7726 struct io_rsrc_node *ref_node;
7728 ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
7732 if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero,
7737 INIT_LIST_HEAD(&ref_node->node);
7738 INIT_LIST_HEAD(&ref_node->rsrc_list);
7739 ref_node->done = false;
7743 static void io_rsrc_node_switch(struct io_ring_ctx *ctx,
7744 struct io_rsrc_data *data_to_kill)
7746 WARN_ON_ONCE(!ctx->rsrc_backup_node);
7747 WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node);
7750 struct io_rsrc_node *rsrc_node = ctx->rsrc_node;
7752 rsrc_node->rsrc_data = data_to_kill;
7753 spin_lock_irq(&ctx->rsrc_ref_lock);
7754 list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list);
7755 spin_unlock_irq(&ctx->rsrc_ref_lock);
7757 atomic_inc(&data_to_kill->refs);
7758 percpu_ref_kill(&rsrc_node->refs);
7759 ctx->rsrc_node = NULL;
7762 if (!ctx->rsrc_node) {
7763 ctx->rsrc_node = ctx->rsrc_backup_node;
7764 ctx->rsrc_backup_node = NULL;
7768 static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx)
7770 if (ctx->rsrc_backup_node)
7772 ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx);
7773 return ctx->rsrc_backup_node ? 0 : -ENOMEM;
7776 static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx)
7780 /* As we may drop ->uring_lock, other task may have started quiesce */
7784 data->quiesce = true;
7786 ret = io_rsrc_node_switch_start(ctx);
7789 io_rsrc_node_switch(ctx, data);
7791 /* kill initial ref, already quiesced if zero */
7792 if (atomic_dec_and_test(&data->refs))
7794 mutex_unlock(&ctx->uring_lock);
7795 flush_delayed_work(&ctx->rsrc_put_work);
7796 ret = wait_for_completion_interruptible(&data->done);
7798 mutex_lock(&ctx->uring_lock);
7802 atomic_inc(&data->refs);
7803 /* wait for all works potentially completing data->done */
7804 flush_delayed_work(&ctx->rsrc_put_work);
7805 reinit_completion(&data->done);
7807 ret = io_run_task_work_sig();
7808 mutex_lock(&ctx->uring_lock);
7810 data->quiesce = false;
7815 static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
7817 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
7818 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
7820 return &data->tags[table_idx][off];
7823 static void io_rsrc_data_free(struct io_rsrc_data *data)
7825 size_t size = data->nr * sizeof(data->tags[0][0]);
7828 io_free_page_table((void **)data->tags, size);
7832 static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put,
7833 u64 __user *utags, unsigned nr,
7834 struct io_rsrc_data **pdata)
7836 struct io_rsrc_data *data;
7840 data = kzalloc(sizeof(*data), GFP_KERNEL);
7843 data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0]));
7851 data->do_put = do_put;
7854 for (i = 0; i < nr; i++) {
7855 u64 *tag_slot = io_get_tag_slot(data, i);
7857 if (copy_from_user(tag_slot, &utags[i],
7863 atomic_set(&data->refs, 1);
7864 init_completion(&data->done);
7868 io_rsrc_data_free(data);
7872 static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files)
7874 table->files = kvcalloc(nr_files, sizeof(table->files[0]),
7875 GFP_KERNEL_ACCOUNT);
7876 return !!table->files;
7879 static void io_free_file_tables(struct io_file_table *table)
7881 kvfree(table->files);
7882 table->files = NULL;
7885 static void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
7887 #if defined(CONFIG_UNIX)
7888 if (ctx->ring_sock) {
7889 struct sock *sock = ctx->ring_sock->sk;
7890 struct sk_buff *skb;
7892 while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL)
7898 for (i = 0; i < ctx->nr_user_files; i++) {
7901 file = io_file_from_index(ctx, i);
7906 io_free_file_tables(&ctx->file_table);
7907 io_rsrc_data_free(ctx->file_data);
7908 ctx->file_data = NULL;
7909 ctx->nr_user_files = 0;
7912 static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
7916 if (!ctx->file_data)
7918 ret = io_rsrc_ref_quiesce(ctx->file_data, ctx);
7920 __io_sqe_files_unregister(ctx);
7924 static void io_sq_thread_unpark(struct io_sq_data *sqd)
7925 __releases(&sqd->lock)
7927 WARN_ON_ONCE(sqd->thread == current);
7930 * Do the dance but not conditional clear_bit() because it'd race with
7931 * other threads incrementing park_pending and setting the bit.
7933 clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
7934 if (atomic_dec_return(&sqd->park_pending))
7935 set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
7936 mutex_unlock(&sqd->lock);
7939 static void io_sq_thread_park(struct io_sq_data *sqd)
7940 __acquires(&sqd->lock)
7942 WARN_ON_ONCE(sqd->thread == current);
7944 atomic_inc(&sqd->park_pending);
7945 set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);
7946 mutex_lock(&sqd->lock);
7948 wake_up_process(sqd->thread);
7951 static void io_sq_thread_stop(struct io_sq_data *sqd)
7953 WARN_ON_ONCE(sqd->thread == current);
7954 WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state));
7956 set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state);
7957 mutex_lock(&sqd->lock);
7959 wake_up_process(sqd->thread);
7960 mutex_unlock(&sqd->lock);
7961 wait_for_completion(&sqd->exited);
7964 static void io_put_sq_data(struct io_sq_data *sqd)
7966 if (refcount_dec_and_test(&sqd->refs)) {
7967 WARN_ON_ONCE(atomic_read(&sqd->park_pending));
7969 io_sq_thread_stop(sqd);
7974 static void io_sq_thread_finish(struct io_ring_ctx *ctx)
7976 struct io_sq_data *sqd = ctx->sq_data;
7979 io_sq_thread_park(sqd);
7980 list_del_init(&ctx->sqd_list);
7981 io_sqd_update_thread_idle(sqd);
7982 io_sq_thread_unpark(sqd);
7984 io_put_sq_data(sqd);
7985 ctx->sq_data = NULL;
7989 static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p)
7991 struct io_ring_ctx *ctx_attach;
7992 struct io_sq_data *sqd;
7995 f = fdget(p->wq_fd);
7997 return ERR_PTR(-ENXIO);
7998 if (f.file->f_op != &io_uring_fops) {
8000 return ERR_PTR(-EINVAL);
8003 ctx_attach = f.file->private_data;
8004 sqd = ctx_attach->sq_data;
8007 return ERR_PTR(-EINVAL);
8009 if (sqd->task_tgid != current->tgid) {
8011 return ERR_PTR(-EPERM);
8014 refcount_inc(&sqd->refs);
8019 static struct io_sq_data *io_get_sq_data(struct io_uring_params *p,
8022 struct io_sq_data *sqd;
8025 if (p->flags & IORING_SETUP_ATTACH_WQ) {
8026 sqd = io_attach_sq_data(p);
8031 /* fall through for EPERM case, setup new sqd/task */
8032 if (PTR_ERR(sqd) != -EPERM)
8036 sqd = kzalloc(sizeof(*sqd), GFP_KERNEL);
8038 return ERR_PTR(-ENOMEM);
8040 atomic_set(&sqd->park_pending, 0);
8041 refcount_set(&sqd->refs, 1);
8042 INIT_LIST_HEAD(&sqd->ctx_list);
8043 mutex_init(&sqd->lock);
8044 init_waitqueue_head(&sqd->wait);
8045 init_completion(&sqd->exited);
8049 #if defined(CONFIG_UNIX)
8051 * Ensure the UNIX gc is aware of our file set, so we are certain that
8052 * the io_uring can be safely unregistered on process exit, even if we have
8053 * loops in the file referencing.
8055 static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
8057 struct sock *sk = ctx->ring_sock->sk;
8058 struct scm_fp_list *fpl;
8059 struct sk_buff *skb;
8062 fpl = kzalloc(sizeof(*fpl), GFP_KERNEL);
8066 skb = alloc_skb(0, GFP_KERNEL);
8075 fpl->user = get_uid(current_user());
8076 for (i = 0; i < nr; i++) {
8077 struct file *file = io_file_from_index(ctx, i + offset);
8081 fpl->fp[nr_files] = get_file(file);
8082 unix_inflight(fpl->user, fpl->fp[nr_files]);
8087 fpl->max = SCM_MAX_FD;
8088 fpl->count = nr_files;
8089 UNIXCB(skb).fp = fpl;
8090 skb->destructor = unix_destruct_scm;
8091 refcount_add(skb->truesize, &sk->sk_wmem_alloc);
8092 skb_queue_head(&sk->sk_receive_queue, skb);
8094 for (i = 0; i < nr_files; i++)
8105 * If UNIX sockets are enabled, fd passing can cause a reference cycle which
8106 * causes regular reference counting to break down. We rely on the UNIX
8107 * garbage collection to take care of this problem for us.
8109 static int io_sqe_files_scm(struct io_ring_ctx *ctx)
8111 unsigned left, total;
8115 left = ctx->nr_user_files;
8117 unsigned this_files = min_t(unsigned, left, SCM_MAX_FD);
8119 ret = __io_sqe_files_scm(ctx, this_files, total);
8123 total += this_files;
8129 while (total < ctx->nr_user_files) {
8130 struct file *file = io_file_from_index(ctx, total);
8140 static int io_sqe_files_scm(struct io_ring_ctx *ctx)
8146 static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc)
8148 struct file *file = prsrc->file;
8149 #if defined(CONFIG_UNIX)
8150 struct sock *sock = ctx->ring_sock->sk;
8151 struct sk_buff_head list, *head = &sock->sk_receive_queue;
8152 struct sk_buff *skb;
8155 __skb_queue_head_init(&list);
8158 * Find the skb that holds this file in its SCM_RIGHTS. When found,
8159 * remove this entry and rearrange the file array.
8161 skb = skb_dequeue(head);
8163 struct scm_fp_list *fp;
8165 fp = UNIXCB(skb).fp;
8166 for (i = 0; i < fp->count; i++) {
8169 if (fp->fp[i] != file)
8172 unix_notinflight(fp->user, fp->fp[i]);
8173 left = fp->count - 1 - i;
8175 memmove(&fp->fp[i], &fp->fp[i + 1],
8176 left * sizeof(struct file *));
8183 __skb_queue_tail(&list, skb);
8193 __skb_queue_tail(&list, skb);
8195 skb = skb_dequeue(head);
8198 if (skb_peek(&list)) {
8199 spin_lock_irq(&head->lock);
8200 while ((skb = __skb_dequeue(&list)) != NULL)
8201 __skb_queue_tail(head, skb);
8202 spin_unlock_irq(&head->lock);
8209 static void __io_rsrc_put_work(struct io_rsrc_node *ref_node)
8211 struct io_rsrc_data *rsrc_data = ref_node->rsrc_data;
8212 struct io_ring_ctx *ctx = rsrc_data->ctx;
8213 struct io_rsrc_put *prsrc, *tmp;
8215 list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) {
8216 list_del(&prsrc->list);
8219 bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL;
8221 io_ring_submit_lock(ctx, lock_ring);
8222 spin_lock(&ctx->completion_lock);
8223 io_cqring_fill_event(ctx, prsrc->tag, 0, 0);
8225 io_commit_cqring(ctx);
8226 spin_unlock(&ctx->completion_lock);
8227 io_cqring_ev_posted(ctx);
8228 io_ring_submit_unlock(ctx, lock_ring);
8231 rsrc_data->do_put(ctx, prsrc);
8235 io_rsrc_node_destroy(ref_node);
8236 if (atomic_dec_and_test(&rsrc_data->refs))
8237 complete(&rsrc_data->done);
8240 static void io_rsrc_put_work(struct work_struct *work)
8242 struct io_ring_ctx *ctx;
8243 struct llist_node *node;
8245 ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work);
8246 node = llist_del_all(&ctx->rsrc_put_llist);
8249 struct io_rsrc_node *ref_node;
8250 struct llist_node *next = node->next;
8252 ref_node = llist_entry(node, struct io_rsrc_node, llist);
8253 __io_rsrc_put_work(ref_node);
8258 static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
8259 unsigned nr_args, u64 __user *tags)
8261 __s32 __user *fds = (__s32 __user *) arg;
8270 if (nr_args > IORING_MAX_FIXED_FILES)
8272 if (nr_args > rlimit(RLIMIT_NOFILE))
8274 ret = io_rsrc_node_switch_start(ctx);
8277 ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args,
8283 if (!io_alloc_file_tables(&ctx->file_table, nr_args))
8286 for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
8287 if (copy_from_user(&fd, &fds[i], sizeof(fd))) {
8291 /* allow sparse sets */
8294 if (unlikely(*io_get_tag_slot(ctx->file_data, i)))
8301 if (unlikely(!file))
8305 * Don't allow io_uring instances to be registered. If UNIX
8306 * isn't enabled, then this causes a reference cycle and this
8307 * instance can never get freed. If UNIX is enabled we'll
8308 * handle it just fine, but there's still no point in allowing
8309 * a ring fd as it doesn't support regular read/write anyway.
8311 if (file->f_op == &io_uring_fops) {
8315 io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file);
8318 ret = io_sqe_files_scm(ctx);
8320 __io_sqe_files_unregister(ctx);
8324 io_rsrc_node_switch(ctx, NULL);
8327 for (i = 0; i < ctx->nr_user_files; i++) {
8328 file = io_file_from_index(ctx, i);
8332 io_free_file_tables(&ctx->file_table);
8333 ctx->nr_user_files = 0;
8335 io_rsrc_data_free(ctx->file_data);
8336 ctx->file_data = NULL;
8340 static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
8343 #if defined(CONFIG_UNIX)
8344 struct sock *sock = ctx->ring_sock->sk;
8345 struct sk_buff_head *head = &sock->sk_receive_queue;
8346 struct sk_buff *skb;
8349 * See if we can merge this file into an existing skb SCM_RIGHTS
8350 * file set. If there's no room, fall back to allocating a new skb
8351 * and filling it in.
8353 spin_lock_irq(&head->lock);
8354 skb = skb_peek(head);
8356 struct scm_fp_list *fpl = UNIXCB(skb).fp;
8358 if (fpl->count < SCM_MAX_FD) {
8359 __skb_unlink(skb, head);
8360 spin_unlock_irq(&head->lock);
8361 fpl->fp[fpl->count] = get_file(file);
8362 unix_inflight(fpl->user, fpl->fp[fpl->count]);
8364 spin_lock_irq(&head->lock);
8365 __skb_queue_head(head, skb);
8370 spin_unlock_irq(&head->lock);
8377 return __io_sqe_files_scm(ctx, 1, index);
8383 static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
8384 struct io_rsrc_node *node, void *rsrc)
8386 struct io_rsrc_put *prsrc;
8388 prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL);
8392 prsrc->tag = *io_get_tag_slot(data, idx);
8394 list_add(&prsrc->list, &node->rsrc_list);
8398 static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
8399 unsigned int issue_flags, u32 slot_index)
8401 struct io_ring_ctx *ctx = req->ctx;
8402 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
8403 bool needs_switch = false;
8404 struct io_fixed_file *file_slot;
8407 io_ring_submit_lock(ctx, !force_nonblock);
8408 if (file->f_op == &io_uring_fops)
8411 if (!ctx->file_data)
8414 if (slot_index >= ctx->nr_user_files)
8417 slot_index = array_index_nospec(slot_index, ctx->nr_user_files);
8418 file_slot = io_fixed_file_slot(&ctx->file_table, slot_index);
8420 if (file_slot->file_ptr) {
8421 struct file *old_file;
8423 ret = io_rsrc_node_switch_start(ctx);
8427 old_file = (struct file *)(file_slot->file_ptr & FFS_MASK);
8428 ret = io_queue_rsrc_removal(ctx->file_data, slot_index,
8429 ctx->rsrc_node, old_file);
8432 file_slot->file_ptr = 0;
8433 needs_switch = true;
8436 *io_get_tag_slot(ctx->file_data, slot_index) = 0;
8437 io_fixed_file_set(file_slot, file);
8438 ret = io_sqe_file_register(ctx, file, slot_index);
8440 file_slot->file_ptr = 0;
8447 io_rsrc_node_switch(ctx, ctx->file_data);
8448 io_ring_submit_unlock(ctx, !force_nonblock);
8454 static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags)
8456 unsigned int offset = req->close.file_slot - 1;
8457 struct io_ring_ctx *ctx = req->ctx;
8458 struct io_fixed_file *file_slot;
8462 io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
8464 if (unlikely(!ctx->file_data))
8467 if (offset >= ctx->nr_user_files)
8469 ret = io_rsrc_node_switch_start(ctx);
8473 i = array_index_nospec(offset, ctx->nr_user_files);
8474 file_slot = io_fixed_file_slot(&ctx->file_table, i);
8476 if (!file_slot->file_ptr)
8479 file = (struct file *)(file_slot->file_ptr & FFS_MASK);
8480 ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file);
8484 file_slot->file_ptr = 0;
8485 io_rsrc_node_switch(ctx, ctx->file_data);
8488 io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
8492 static int __io_sqe_files_update(struct io_ring_ctx *ctx,
8493 struct io_uring_rsrc_update2 *up,
8496 u64 __user *tags = u64_to_user_ptr(up->tags);
8497 __s32 __user *fds = u64_to_user_ptr(up->data);
8498 struct io_rsrc_data *data = ctx->file_data;
8499 struct io_fixed_file *file_slot;
8503 bool needs_switch = false;
8505 if (!ctx->file_data)
8507 if (up->offset + nr_args > ctx->nr_user_files)
8510 for (done = 0; done < nr_args; done++) {
8513 if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) ||
8514 copy_from_user(&fd, &fds[done], sizeof(fd))) {
8518 if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) {
8522 if (fd == IORING_REGISTER_FILES_SKIP)
8525 i = array_index_nospec(up->offset + done, ctx->nr_user_files);
8526 file_slot = io_fixed_file_slot(&ctx->file_table, i);
8528 if (file_slot->file_ptr) {
8529 file = (struct file *)(file_slot->file_ptr & FFS_MASK);
8530 err = io_queue_rsrc_removal(data, up->offset + done,
8531 ctx->rsrc_node, file);
8534 file_slot->file_ptr = 0;
8535 needs_switch = true;
8544 * Don't allow io_uring instances to be registered. If
8545 * UNIX isn't enabled, then this causes a reference
8546 * cycle and this instance can never get freed. If UNIX
8547 * is enabled we'll handle it just fine, but there's
8548 * still no point in allowing a ring fd as it doesn't
8549 * support regular read/write anyway.
8551 if (file->f_op == &io_uring_fops) {
8556 *io_get_tag_slot(data, up->offset + done) = tag;
8557 io_fixed_file_set(file_slot, file);
8558 err = io_sqe_file_register(ctx, file, i);
8560 file_slot->file_ptr = 0;
8568 io_rsrc_node_switch(ctx, data);
8569 return done ? done : err;
8572 static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx,
8573 struct task_struct *task)
8575 struct io_wq_hash *hash;
8576 struct io_wq_data data;
8577 unsigned int concurrency;
8579 mutex_lock(&ctx->uring_lock);
8580 hash = ctx->hash_map;
8582 hash = kzalloc(sizeof(*hash), GFP_KERNEL);
8584 mutex_unlock(&ctx->uring_lock);
8585 return ERR_PTR(-ENOMEM);
8587 refcount_set(&hash->refs, 1);
8588 init_waitqueue_head(&hash->wait);
8589 ctx->hash_map = hash;
8591 mutex_unlock(&ctx->uring_lock);
8595 data.free_work = io_wq_free_work;
8596 data.do_work = io_wq_submit_work;
8598 /* Do QD, or 4 * CPUS, whatever is smallest */
8599 concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
8601 return io_wq_create(concurrency, &data);
8604 static int io_uring_alloc_task_context(struct task_struct *task,
8605 struct io_ring_ctx *ctx)
8607 struct io_uring_task *tctx;
8610 tctx = kzalloc(sizeof(*tctx), GFP_KERNEL);
8611 if (unlikely(!tctx))
8614 ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL);
8615 if (unlikely(ret)) {
8620 tctx->io_wq = io_init_wq_offload(ctx, task);
8621 if (IS_ERR(tctx->io_wq)) {
8622 ret = PTR_ERR(tctx->io_wq);
8623 percpu_counter_destroy(&tctx->inflight);
8629 init_waitqueue_head(&tctx->wait);
8630 atomic_set(&tctx->in_idle, 0);
8631 atomic_set(&tctx->inflight_tracked, 0);
8632 task->io_uring = tctx;
8633 spin_lock_init(&tctx->task_lock);
8634 INIT_WQ_LIST(&tctx->task_list);
8635 init_task_work(&tctx->task_work, tctx_task_work);
8639 void __io_uring_free(struct task_struct *tsk)
8641 struct io_uring_task *tctx = tsk->io_uring;
8643 WARN_ON_ONCE(!xa_empty(&tctx->xa));
8644 WARN_ON_ONCE(tctx->io_wq);
8645 WARN_ON_ONCE(tctx->cached_refs);
8647 percpu_counter_destroy(&tctx->inflight);
8649 tsk->io_uring = NULL;
8652 static int io_sq_offload_create(struct io_ring_ctx *ctx,
8653 struct io_uring_params *p)
8657 /* Retain compatibility with failing for an invalid attach attempt */
8658 if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) ==
8659 IORING_SETUP_ATTACH_WQ) {
8662 f = fdget(p->wq_fd);
8665 if (f.file->f_op != &io_uring_fops) {
8671 if (ctx->flags & IORING_SETUP_SQPOLL) {
8672 struct task_struct *tsk;
8673 struct io_sq_data *sqd;
8676 sqd = io_get_sq_data(p, &attached);
8682 ctx->sq_creds = get_current_cred();
8684 ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle);
8685 if (!ctx->sq_thread_idle)
8686 ctx->sq_thread_idle = HZ;
8688 io_sq_thread_park(sqd);
8689 list_add(&ctx->sqd_list, &sqd->ctx_list);
8690 io_sqd_update_thread_idle(sqd);
8691 /* don't attach to a dying SQPOLL thread, would be racy */
8692 ret = (attached && !sqd->thread) ? -ENXIO : 0;
8693 io_sq_thread_unpark(sqd);
8700 if (p->flags & IORING_SETUP_SQ_AFF) {
8701 int cpu = p->sq_thread_cpu;
8704 if (cpu >= nr_cpu_ids || !cpu_online(cpu))
8711 sqd->task_pid = current->pid;
8712 sqd->task_tgid = current->tgid;
8713 tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE);
8720 ret = io_uring_alloc_task_context(tsk, ctx);
8721 wake_up_new_task(tsk);
8724 } else if (p->flags & IORING_SETUP_SQ_AFF) {
8725 /* Can't have SQ_AFF without SQPOLL */
8732 complete(&ctx->sq_data->exited);
8734 io_sq_thread_finish(ctx);
8738 static inline void __io_unaccount_mem(struct user_struct *user,
8739 unsigned long nr_pages)
8741 atomic_long_sub(nr_pages, &user->locked_vm);
8744 static inline int __io_account_mem(struct user_struct *user,
8745 unsigned long nr_pages)
8747 unsigned long page_limit, cur_pages, new_pages;
8749 /* Don't allow more pages than we can safely lock */
8750 page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
8753 cur_pages = atomic_long_read(&user->locked_vm);
8754 new_pages = cur_pages + nr_pages;
8755 if (new_pages > page_limit)
8757 } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages,
8758 new_pages) != cur_pages);
8763 static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
8766 __io_unaccount_mem(ctx->user, nr_pages);
8768 if (ctx->mm_account)
8769 atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm);
8772 static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages)
8777 ret = __io_account_mem(ctx->user, nr_pages);
8782 if (ctx->mm_account)
8783 atomic64_add(nr_pages, &ctx->mm_account->pinned_vm);
8788 static void io_mem_free(void *ptr)
8795 page = virt_to_head_page(ptr);
8796 if (put_page_testzero(page))
8797 free_compound_page(page);
8800 static void *io_mem_alloc(size_t size)
8802 gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP |
8803 __GFP_NORETRY | __GFP_ACCOUNT;
8805 return (void *) __get_free_pages(gfp_flags, get_order(size));
8808 static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries,
8811 struct io_rings *rings;
8812 size_t off, sq_array_size;
8814 off = struct_size(rings, cqes, cq_entries);
8815 if (off == SIZE_MAX)
8819 off = ALIGN(off, SMP_CACHE_BYTES);
8827 sq_array_size = array_size(sizeof(u32), sq_entries);
8828 if (sq_array_size == SIZE_MAX)
8831 if (check_add_overflow(off, sq_array_size, &off))
8837 static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot)
8839 struct io_mapped_ubuf *imu = *slot;
8842 if (imu != ctx->dummy_ubuf) {
8843 for (i = 0; i < imu->nr_bvecs; i++)
8844 unpin_user_page(imu->bvec[i].bv_page);
8845 if (imu->acct_pages)
8846 io_unaccount_mem(ctx, imu->acct_pages);
8852 static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc)
8854 io_buffer_unmap(ctx, &prsrc->buf);
8858 static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
8862 for (i = 0; i < ctx->nr_user_bufs; i++)
8863 io_buffer_unmap(ctx, &ctx->user_bufs[i]);
8864 kfree(ctx->user_bufs);
8865 io_rsrc_data_free(ctx->buf_data);
8866 ctx->user_bufs = NULL;
8867 ctx->buf_data = NULL;
8868 ctx->nr_user_bufs = 0;
8871 static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
8878 ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx);
8880 __io_sqe_buffers_unregister(ctx);
8884 static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst,
8885 void __user *arg, unsigned index)
8887 struct iovec __user *src;
8889 #ifdef CONFIG_COMPAT
8891 struct compat_iovec __user *ciovs;
8892 struct compat_iovec ciov;
8894 ciovs = (struct compat_iovec __user *) arg;
8895 if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov)))
8898 dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base);
8899 dst->iov_len = ciov.iov_len;
8903 src = (struct iovec __user *) arg;
8904 if (copy_from_user(dst, &src[index], sizeof(*dst)))
8910 * Not super efficient, but this is just a registration time. And we do cache
8911 * the last compound head, so generally we'll only do a full search if we don't
8914 * We check if the given compound head page has already been accounted, to
8915 * avoid double accounting it. This allows us to account the full size of the
8916 * page, not just the constituent pages of a huge page.
8918 static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages,
8919 int nr_pages, struct page *hpage)
8923 /* check current page array */
8924 for (i = 0; i < nr_pages; i++) {
8925 if (!PageCompound(pages[i]))
8927 if (compound_head(pages[i]) == hpage)
8931 /* check previously registered pages */
8932 for (i = 0; i < ctx->nr_user_bufs; i++) {
8933 struct io_mapped_ubuf *imu = ctx->user_bufs[i];
8935 for (j = 0; j < imu->nr_bvecs; j++) {
8936 if (!PageCompound(imu->bvec[j].bv_page))
8938 if (compound_head(imu->bvec[j].bv_page) == hpage)
8946 static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages,
8947 int nr_pages, struct io_mapped_ubuf *imu,
8948 struct page **last_hpage)
8952 imu->acct_pages = 0;
8953 for (i = 0; i < nr_pages; i++) {
8954 if (!PageCompound(pages[i])) {
8959 hpage = compound_head(pages[i]);
8960 if (hpage == *last_hpage)
8962 *last_hpage = hpage;
8963 if (headpage_already_acct(ctx, pages, i, hpage))
8965 imu->acct_pages += page_size(hpage) >> PAGE_SHIFT;
8969 if (!imu->acct_pages)
8972 ret = io_account_mem(ctx, imu->acct_pages);
8974 imu->acct_pages = 0;
8978 static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
8979 struct io_mapped_ubuf **pimu,
8980 struct page **last_hpage)
8982 struct io_mapped_ubuf *imu = NULL;
8983 struct vm_area_struct **vmas = NULL;
8984 struct page **pages = NULL;
8985 unsigned long off, start, end, ubuf;
8987 int ret, pret, nr_pages, i;
8989 if (!iov->iov_base) {
8990 *pimu = ctx->dummy_ubuf;
8994 ubuf = (unsigned long) iov->iov_base;
8995 end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
8996 start = ubuf >> PAGE_SHIFT;
8997 nr_pages = end - start;
9002 pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
9006 vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *),
9011 imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL);
9016 mmap_read_lock(current->mm);
9017 pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM,
9019 if (pret == nr_pages) {
9020 /* don't support file backed memory */
9021 for (i = 0; i < nr_pages; i++) {
9022 struct vm_area_struct *vma = vmas[i];
9024 if (vma_is_shmem(vma))
9027 !is_file_hugepages(vma->vm_file)) {
9033 ret = pret < 0 ? pret : -EFAULT;
9035 mmap_read_unlock(current->mm);
9038 * if we did partial map, or found file backed vmas,
9039 * release any pages we did get
9042 unpin_user_pages(pages, pret);
9046 ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage);
9048 unpin_user_pages(pages, pret);
9052 off = ubuf & ~PAGE_MASK;
9053 size = iov->iov_len;
9054 for (i = 0; i < nr_pages; i++) {
9057 vec_len = min_t(size_t, size, PAGE_SIZE - off);
9058 imu->bvec[i].bv_page = pages[i];
9059 imu->bvec[i].bv_len = vec_len;
9060 imu->bvec[i].bv_offset = off;
9064 /* store original address for later verification */
9066 imu->ubuf_end = ubuf + iov->iov_len;
9067 imu->nr_bvecs = nr_pages;
9078 static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args)
9080 ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL);
9081 return ctx->user_bufs ? 0 : -ENOMEM;
9084 static int io_buffer_validate(struct iovec *iov)
9086 unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1);
9089 * Don't impose further limits on the size and buffer
9090 * constraints here, we'll -EINVAL later when IO is
9091 * submitted if they are wrong.
9094 return iov->iov_len ? -EFAULT : 0;
9098 /* arbitrary limit, but we need something */
9099 if (iov->iov_len > SZ_1G)
9102 if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp))
9108 static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
9109 unsigned int nr_args, u64 __user *tags)
9111 struct page *last_hpage = NULL;
9112 struct io_rsrc_data *data;
9118 if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS)
9120 ret = io_rsrc_node_switch_start(ctx);
9123 ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data);
9126 ret = io_buffers_map_alloc(ctx, nr_args);
9128 io_rsrc_data_free(data);
9132 for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) {
9133 ret = io_copy_iov(ctx, &iov, arg, i);
9136 ret = io_buffer_validate(&iov);
9139 if (!iov.iov_base && *io_get_tag_slot(data, i)) {
9144 ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i],
9150 WARN_ON_ONCE(ctx->buf_data);
9152 ctx->buf_data = data;
9154 __io_sqe_buffers_unregister(ctx);
9156 io_rsrc_node_switch(ctx, NULL);
9160 static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
9161 struct io_uring_rsrc_update2 *up,
9162 unsigned int nr_args)
9164 u64 __user *tags = u64_to_user_ptr(up->tags);
9165 struct iovec iov, __user *iovs = u64_to_user_ptr(up->data);
9166 struct page *last_hpage = NULL;
9167 bool needs_switch = false;
9173 if (up->offset + nr_args > ctx->nr_user_bufs)
9176 for (done = 0; done < nr_args; done++) {
9177 struct io_mapped_ubuf *imu;
9178 int offset = up->offset + done;
9181 err = io_copy_iov(ctx, &iov, iovs, done);
9184 if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) {
9188 err = io_buffer_validate(&iov);
9191 if (!iov.iov_base && tag) {
9195 err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage);
9199 i = array_index_nospec(offset, ctx->nr_user_bufs);
9200 if (ctx->user_bufs[i] != ctx->dummy_ubuf) {
9201 err = io_queue_rsrc_removal(ctx->buf_data, offset,
9202 ctx->rsrc_node, ctx->user_bufs[i]);
9203 if (unlikely(err)) {
9204 io_buffer_unmap(ctx, &imu);
9207 ctx->user_bufs[i] = NULL;
9208 needs_switch = true;
9211 ctx->user_bufs[i] = imu;
9212 *io_get_tag_slot(ctx->buf_data, offset) = tag;
9216 io_rsrc_node_switch(ctx, ctx->buf_data);
9217 return done ? done : err;
9220 static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg)
9222 __s32 __user *fds = arg;
9228 if (copy_from_user(&fd, fds, sizeof(*fds)))
9231 ctx->cq_ev_fd = eventfd_ctx_fdget(fd);
9232 if (IS_ERR(ctx->cq_ev_fd)) {
9233 int ret = PTR_ERR(ctx->cq_ev_fd);
9235 ctx->cq_ev_fd = NULL;
9242 static int io_eventfd_unregister(struct io_ring_ctx *ctx)
9244 if (ctx->cq_ev_fd) {
9245 eventfd_ctx_put(ctx->cq_ev_fd);
9246 ctx->cq_ev_fd = NULL;
9253 static void io_destroy_buffers(struct io_ring_ctx *ctx)
9255 struct io_buffer *buf;
9256 unsigned long index;
9258 xa_for_each(&ctx->io_buffers, index, buf)
9259 __io_remove_buffers(ctx, buf, index, -1U);
9262 static void io_req_cache_free(struct list_head *list)
9264 struct io_kiocb *req, *nxt;
9266 list_for_each_entry_safe(req, nxt, list, inflight_entry) {
9267 list_del(&req->inflight_entry);
9268 kmem_cache_free(req_cachep, req);
9272 static void io_req_caches_free(struct io_ring_ctx *ctx)
9274 struct io_submit_state *state = &ctx->submit_state;
9276 mutex_lock(&ctx->uring_lock);
9278 if (state->free_reqs) {
9279 kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);
9280 state->free_reqs = 0;
9283 io_flush_cached_locked_reqs(ctx, state);
9284 io_req_cache_free(&state->free_list);
9285 mutex_unlock(&ctx->uring_lock);
9288 static void io_wait_rsrc_data(struct io_rsrc_data *data)
9290 if (data && !atomic_dec_and_test(&data->refs))
9291 wait_for_completion(&data->done);
9294 static void io_ring_ctx_free(struct io_ring_ctx *ctx)
9296 io_sq_thread_finish(ctx);
9298 if (ctx->mm_account) {
9299 mmdrop(ctx->mm_account);
9300 ctx->mm_account = NULL;
9303 /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */
9304 io_wait_rsrc_data(ctx->buf_data);
9305 io_wait_rsrc_data(ctx->file_data);
9307 mutex_lock(&ctx->uring_lock);
9309 __io_sqe_buffers_unregister(ctx);
9311 __io_sqe_files_unregister(ctx);
9313 __io_cqring_overflow_flush(ctx, true);
9314 mutex_unlock(&ctx->uring_lock);
9315 io_eventfd_unregister(ctx);
9316 io_destroy_buffers(ctx);
9318 put_cred(ctx->sq_creds);
9320 /* there are no registered resources left, nobody uses it */
9322 io_rsrc_node_destroy(ctx->rsrc_node);
9323 if (ctx->rsrc_backup_node)
9324 io_rsrc_node_destroy(ctx->rsrc_backup_node);
9325 flush_delayed_work(&ctx->rsrc_put_work);
9327 WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list));
9328 WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist));
9330 #if defined(CONFIG_UNIX)
9331 if (ctx->ring_sock) {
9332 ctx->ring_sock->file = NULL; /* so that iput() is called */
9333 sock_release(ctx->ring_sock);
9336 WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
9338 io_mem_free(ctx->rings);
9339 io_mem_free(ctx->sq_sqes);
9341 percpu_ref_exit(&ctx->refs);
9342 free_uid(ctx->user);
9343 io_req_caches_free(ctx);
9345 io_wq_put_hash(ctx->hash_map);
9346 kfree(ctx->cancel_hash);
9347 kfree(ctx->dummy_ubuf);
9351 static __poll_t io_uring_poll(struct file *file, poll_table *wait)
9353 struct io_ring_ctx *ctx = file->private_data;
9356 poll_wait(file, &ctx->poll_wait, wait);
9358 * synchronizes with barrier from wq_has_sleeper call in
9362 if (!io_sqring_full(ctx))
9363 mask |= EPOLLOUT | EPOLLWRNORM;
9366 * Don't flush cqring overflow list here, just do a simple check.
9367 * Otherwise there could possible be ABBA deadlock:
9370 * lock(&ctx->uring_lock);
9372 * lock(&ctx->uring_lock);
9375 * Users may get EPOLLIN meanwhile seeing nothing in cqring, this
9376 * pushs them to do the flush.
9378 if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow))
9379 mask |= EPOLLIN | EPOLLRDNORM;
9384 static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
9386 const struct cred *creds;
9388 creds = xa_erase(&ctx->personalities, id);
9397 struct io_tctx_exit {
9398 struct callback_head task_work;
9399 struct completion completion;
9400 struct io_ring_ctx *ctx;
9403 static void io_tctx_exit_cb(struct callback_head *cb)
9405 struct io_uring_task *tctx = current->io_uring;
9406 struct io_tctx_exit *work;
9408 work = container_of(cb, struct io_tctx_exit, task_work);
9410 * When @in_idle, we're in cancellation and it's racy to remove the
9411 * node. It'll be removed by the end of cancellation, just ignore it.
9413 if (!atomic_read(&tctx->in_idle))
9414 io_uring_del_tctx_node((unsigned long)work->ctx);
9415 complete(&work->completion);
9418 static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data)
9420 struct io_kiocb *req = container_of(work, struct io_kiocb, work);
9422 return req->ctx == data;
9425 static void io_ring_exit_work(struct work_struct *work)
9427 struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work);
9428 unsigned long timeout = jiffies + HZ * 60 * 5;
9429 unsigned long interval = HZ / 20;
9430 struct io_tctx_exit exit;
9431 struct io_tctx_node *node;
9435 * If we're doing polled IO and end up having requests being
9436 * submitted async (out-of-line), then completions can come in while
9437 * we're waiting for refs to drop. We need to reap these manually,
9438 * as nobody else will be looking for them.
9441 io_uring_try_cancel_requests(ctx, NULL, true);
9443 struct io_sq_data *sqd = ctx->sq_data;
9444 struct task_struct *tsk;
9446 io_sq_thread_park(sqd);
9448 if (tsk && tsk->io_uring && tsk->io_uring->io_wq)
9449 io_wq_cancel_cb(tsk->io_uring->io_wq,
9450 io_cancel_ctx_cb, ctx, true);
9451 io_sq_thread_unpark(sqd);
9454 if (WARN_ON_ONCE(time_after(jiffies, timeout))) {
9455 /* there is little hope left, don't run it too often */
9458 } while (!wait_for_completion_timeout(&ctx->ref_comp, interval));
9460 init_completion(&exit.completion);
9461 init_task_work(&exit.task_work, io_tctx_exit_cb);
9464 * Some may use context even when all refs and requests have been put,
9465 * and they are free to do so while still holding uring_lock or
9466 * completion_lock, see io_req_task_submit(). Apart from other work,
9467 * this lock/unlock section also waits them to finish.
9469 mutex_lock(&ctx->uring_lock);
9470 while (!list_empty(&ctx->tctx_list)) {
9471 WARN_ON_ONCE(time_after(jiffies, timeout));
9473 node = list_first_entry(&ctx->tctx_list, struct io_tctx_node,
9475 /* don't spin on a single task if cancellation failed */
9476 list_rotate_left(&ctx->tctx_list);
9477 ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL);
9478 if (WARN_ON_ONCE(ret))
9480 wake_up_process(node->task);
9482 mutex_unlock(&ctx->uring_lock);
9483 wait_for_completion(&exit.completion);
9484 mutex_lock(&ctx->uring_lock);
9486 mutex_unlock(&ctx->uring_lock);
9487 spin_lock(&ctx->completion_lock);
9488 spin_unlock(&ctx->completion_lock);
9490 io_ring_ctx_free(ctx);
9493 /* Returns true if we found and killed one or more timeouts */
9494 static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
9497 struct io_kiocb *req, *tmp;
9500 spin_lock(&ctx->completion_lock);
9501 spin_lock_irq(&ctx->timeout_lock);
9502 list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
9503 if (io_match_task(req, tsk, cancel_all)) {
9504 io_kill_timeout(req, -ECANCELED);
9508 spin_unlock_irq(&ctx->timeout_lock);
9510 io_commit_cqring(ctx);
9511 spin_unlock(&ctx->completion_lock);
9513 io_cqring_ev_posted(ctx);
9514 return canceled != 0;
9517 static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
9519 unsigned long index;
9520 struct creds *creds;
9522 mutex_lock(&ctx->uring_lock);
9523 percpu_ref_kill(&ctx->refs);
9525 __io_cqring_overflow_flush(ctx, true);
9526 xa_for_each(&ctx->personalities, index, creds)
9527 io_unregister_personality(ctx, index);
9528 mutex_unlock(&ctx->uring_lock);
9530 io_kill_timeouts(ctx, NULL, true);
9531 io_poll_remove_all(ctx, NULL, true);
9533 /* if we failed setting up the ctx, we might not have any rings */
9534 io_iopoll_try_reap_events(ctx);
9536 INIT_WORK(&ctx->exit_work, io_ring_exit_work);
9538 * Use system_unbound_wq to avoid spawning tons of event kworkers
9539 * if we're exiting a ton of rings at the same time. It just adds
9540 * noise and overhead, there's no discernable change in runtime
9541 * over using system_wq.
9543 queue_work(system_unbound_wq, &ctx->exit_work);
9546 static int io_uring_release(struct inode *inode, struct file *file)
9548 struct io_ring_ctx *ctx = file->private_data;
9550 file->private_data = NULL;
9551 io_ring_ctx_wait_and_kill(ctx);
9555 struct io_task_cancel {
9556 struct task_struct *task;
9560 static bool io_cancel_task_cb(struct io_wq_work *work, void *data)
9562 struct io_kiocb *req = container_of(work, struct io_kiocb, work);
9563 struct io_task_cancel *cancel = data;
9565 return io_match_task_safe(req, cancel->task, cancel->all);
9568 static bool io_cancel_defer_files(struct io_ring_ctx *ctx,
9569 struct task_struct *task, bool cancel_all)
9571 struct io_defer_entry *de;
9574 spin_lock(&ctx->completion_lock);
9575 list_for_each_entry_reverse(de, &ctx->defer_list, list) {
9576 if (io_match_task_safe(de->req, task, cancel_all)) {
9577 list_cut_position(&list, &ctx->defer_list, &de->list);
9581 spin_unlock(&ctx->completion_lock);
9582 if (list_empty(&list))
9585 while (!list_empty(&list)) {
9586 de = list_first_entry(&list, struct io_defer_entry, list);
9587 list_del_init(&de->list);
9588 io_req_complete_failed(de->req, -ECANCELED);
9594 static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx)
9596 struct io_tctx_node *node;
9597 enum io_wq_cancel cret;
9600 mutex_lock(&ctx->uring_lock);
9601 list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
9602 struct io_uring_task *tctx = node->task->io_uring;
9605 * io_wq will stay alive while we hold uring_lock, because it's
9606 * killed after ctx nodes, which requires to take the lock.
9608 if (!tctx || !tctx->io_wq)
9610 cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true);
9611 ret |= (cret != IO_WQ_CANCEL_NOTFOUND);
9613 mutex_unlock(&ctx->uring_lock);
9618 static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx,
9619 struct task_struct *task,
9622 struct io_task_cancel cancel = { .task = task, .all = cancel_all, };
9623 struct io_uring_task *tctx = task ? task->io_uring : NULL;
9626 enum io_wq_cancel cret;
9630 ret |= io_uring_try_cancel_iowq(ctx);
9631 } else if (tctx && tctx->io_wq) {
9633 * Cancels requests of all rings, not only @ctx, but
9634 * it's fine as the task is in exit/exec.
9636 cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb,
9638 ret |= (cret != IO_WQ_CANCEL_NOTFOUND);
9641 /* SQPOLL thread does its own polling */
9642 if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) ||
9643 (ctx->sq_data && ctx->sq_data->thread == current)) {
9644 while (!list_empty_careful(&ctx->iopoll_list)) {
9645 io_iopoll_try_reap_events(ctx);
9650 ret |= io_cancel_defer_files(ctx, task, cancel_all);
9651 ret |= io_poll_remove_all(ctx, task, cancel_all);
9652 ret |= io_kill_timeouts(ctx, task, cancel_all);
9654 ret |= io_run_task_work();
9661 static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx)
9663 struct io_uring_task *tctx = current->io_uring;
9664 struct io_tctx_node *node;
9667 if (unlikely(!tctx)) {
9668 ret = io_uring_alloc_task_context(current, ctx);
9672 tctx = current->io_uring;
9673 if (ctx->iowq_limits_set) {
9674 unsigned int limits[2] = { ctx->iowq_limits[0],
9675 ctx->iowq_limits[1], };
9677 ret = io_wq_max_workers(tctx->io_wq, limits);
9682 if (!xa_load(&tctx->xa, (unsigned long)ctx)) {
9683 node = kmalloc(sizeof(*node), GFP_KERNEL);
9687 node->task = current;
9689 ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx,
9696 mutex_lock(&ctx->uring_lock);
9697 list_add(&node->ctx_node, &ctx->tctx_list);
9698 mutex_unlock(&ctx->uring_lock);
9705 * Note that this task has used io_uring. We use it for cancelation purposes.
9707 static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx)
9709 struct io_uring_task *tctx = current->io_uring;
9711 if (likely(tctx && tctx->last == ctx))
9713 return __io_uring_add_tctx_node(ctx);
9717 * Remove this io_uring_file -> task mapping.
9719 static void io_uring_del_tctx_node(unsigned long index)
9721 struct io_uring_task *tctx = current->io_uring;
9722 struct io_tctx_node *node;
9726 node = xa_erase(&tctx->xa, index);
9730 WARN_ON_ONCE(current != node->task);
9731 WARN_ON_ONCE(list_empty(&node->ctx_node));
9733 mutex_lock(&node->ctx->uring_lock);
9734 list_del(&node->ctx_node);
9735 mutex_unlock(&node->ctx->uring_lock);
9737 if (tctx->last == node->ctx)
9742 static void io_uring_clean_tctx(struct io_uring_task *tctx)
9744 struct io_wq *wq = tctx->io_wq;
9745 struct io_tctx_node *node;
9746 unsigned long index;
9748 xa_for_each(&tctx->xa, index, node) {
9749 io_uring_del_tctx_node(index);
9754 * Must be after io_uring_del_task_file() (removes nodes under
9755 * uring_lock) to avoid race with io_uring_try_cancel_iowq().
9757 io_wq_put_and_exit(wq);
9762 static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked)
9765 return atomic_read(&tctx->inflight_tracked);
9766 return percpu_counter_sum(&tctx->inflight);
9769 static void io_uring_drop_tctx_refs(struct task_struct *task)
9771 struct io_uring_task *tctx = task->io_uring;
9772 unsigned int refs = tctx->cached_refs;
9775 tctx->cached_refs = 0;
9776 percpu_counter_sub(&tctx->inflight, refs);
9777 put_task_struct_many(task, refs);
9782 * Find any io_uring ctx that this task has registered or done IO on, and cancel
9783 * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation.
9785 static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd)
9787 struct io_uring_task *tctx = current->io_uring;
9788 struct io_ring_ctx *ctx;
9792 WARN_ON_ONCE(sqd && sqd->thread != current);
9794 if (!current->io_uring)
9797 io_wq_exit_start(tctx->io_wq);
9799 atomic_inc(&tctx->in_idle);
9801 io_uring_drop_tctx_refs(current);
9802 /* read completions before cancelations */
9803 inflight = tctx_inflight(tctx, !cancel_all);
9808 struct io_tctx_node *node;
9809 unsigned long index;
9811 xa_for_each(&tctx->xa, index, node) {
9812 /* sqpoll task will cancel all its requests */
9813 if (node->ctx->sq_data)
9815 io_uring_try_cancel_requests(node->ctx, current,
9819 list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
9820 io_uring_try_cancel_requests(ctx, current,
9824 prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE);
9826 io_uring_drop_tctx_refs(current);
9829 * If we've seen completions, retry without waiting. This
9830 * avoids a race where a completion comes in before we did
9831 * prepare_to_wait().
9833 if (inflight == tctx_inflight(tctx, !cancel_all))
9835 finish_wait(&tctx->wait, &wait);
9837 atomic_dec(&tctx->in_idle);
9839 io_uring_clean_tctx(tctx);
9841 /* for exec all current's requests should be gone, kill tctx */
9842 __io_uring_free(current);
9846 void __io_uring_cancel(bool cancel_all)
9848 io_uring_cancel_generic(cancel_all, NULL);
9851 static void *io_uring_validate_mmap_request(struct file *file,
9852 loff_t pgoff, size_t sz)
9854 struct io_ring_ctx *ctx = file->private_data;
9855 loff_t offset = pgoff << PAGE_SHIFT;
9860 case IORING_OFF_SQ_RING:
9861 case IORING_OFF_CQ_RING:
9864 case IORING_OFF_SQES:
9868 return ERR_PTR(-EINVAL);
9871 page = virt_to_head_page(ptr);
9872 if (sz > page_size(page))
9873 return ERR_PTR(-EINVAL);
9880 static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
9882 size_t sz = vma->vm_end - vma->vm_start;
9886 ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz);
9888 return PTR_ERR(ptr);
9890 pfn = virt_to_phys(ptr) >> PAGE_SHIFT;
9891 return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot);
9894 #else /* !CONFIG_MMU */
9896 static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
9898 return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL;
9901 static unsigned int io_uring_nommu_mmap_capabilities(struct file *file)
9903 return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE;
9906 static unsigned long io_uring_nommu_get_unmapped_area(struct file *file,
9907 unsigned long addr, unsigned long len,
9908 unsigned long pgoff, unsigned long flags)
9912 ptr = io_uring_validate_mmap_request(file, pgoff, len);
9914 return PTR_ERR(ptr);
9916 return (unsigned long) ptr;
9919 #endif /* !CONFIG_MMU */
9921 static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
9926 if (!io_sqring_full(ctx))
9928 prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE);
9930 if (!io_sqring_full(ctx))
9933 } while (!signal_pending(current));
9935 finish_wait(&ctx->sqo_sq_wait, &wait);
9939 static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz,
9940 struct __kernel_timespec __user **ts,
9941 const sigset_t __user **sig)
9943 struct io_uring_getevents_arg arg;
9946 * If EXT_ARG isn't set, then we have no timespec and the argp pointer
9947 * is just a pointer to the sigset_t.
9949 if (!(flags & IORING_ENTER_EXT_ARG)) {
9950 *sig = (const sigset_t __user *) argp;
9956 * EXT_ARG is set - ensure we agree on the size of it and copy in our
9957 * timespec and sigset_t pointers if good.
9959 if (*argsz != sizeof(arg))
9961 if (copy_from_user(&arg, argp, sizeof(arg)))
9963 *sig = u64_to_user_ptr(arg.sigmask);
9964 *argsz = arg.sigmask_sz;
9965 *ts = u64_to_user_ptr(arg.ts);
9969 SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
9970 u32, min_complete, u32, flags, const void __user *, argp,
9973 struct io_ring_ctx *ctx;
9980 if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP |
9981 IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)))
9985 if (unlikely(!f.file))
9989 if (unlikely(f.file->f_op != &io_uring_fops))
9993 ctx = f.file->private_data;
9994 if (unlikely(!percpu_ref_tryget(&ctx->refs)))
9998 if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED))
10002 * For SQ polling, the thread will do all submissions and completions.
10003 * Just return the requested submit count, and wake the thread if
10004 * we were asked to.
10007 if (ctx->flags & IORING_SETUP_SQPOLL) {
10008 io_cqring_overflow_flush(ctx);
10010 if (unlikely(ctx->sq_data->thread == NULL)) {
10014 if (flags & IORING_ENTER_SQ_WAKEUP)
10015 wake_up(&ctx->sq_data->wait);
10016 if (flags & IORING_ENTER_SQ_WAIT) {
10017 ret = io_sqpoll_wait_sq(ctx);
10021 submitted = to_submit;
10022 } else if (to_submit) {
10023 ret = io_uring_add_tctx_node(ctx);
10026 mutex_lock(&ctx->uring_lock);
10027 submitted = io_submit_sqes(ctx, to_submit);
10028 mutex_unlock(&ctx->uring_lock);
10030 if (submitted != to_submit)
10033 if (flags & IORING_ENTER_GETEVENTS) {
10034 const sigset_t __user *sig;
10035 struct __kernel_timespec __user *ts;
10037 ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig);
10041 min_complete = min(min_complete, ctx->cq_entries);
10044 * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user
10045 * space applications don't need to do io completion events
10046 * polling again, they can rely on io_sq_thread to do polling
10047 * work, which can reduce cpu usage and uring_lock contention.
10049 if (ctx->flags & IORING_SETUP_IOPOLL &&
10050 !(ctx->flags & IORING_SETUP_SQPOLL)) {
10051 ret = io_iopoll_check(ctx, min_complete);
10053 ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts);
10058 percpu_ref_put(&ctx->refs);
10061 return submitted ? submitted : ret;
10064 #ifdef CONFIG_PROC_FS
10065 static int io_uring_show_cred(struct seq_file *m, unsigned int id,
10066 const struct cred *cred)
10068 struct user_namespace *uns = seq_user_ns(m);
10069 struct group_info *gi;
10074 seq_printf(m, "%5d\n", id);
10075 seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
10076 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
10077 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
10078 seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
10079 seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
10080 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
10081 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
10082 seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
10083 seq_puts(m, "\n\tGroups:\t");
10084 gi = cred->group_info;
10085 for (g = 0; g < gi->ngroups; g++) {
10086 seq_put_decimal_ull(m, g ? " " : "",
10087 from_kgid_munged(uns, gi->gid[g]));
10089 seq_puts(m, "\n\tCapEff:\t");
10090 cap = cred->cap_effective;
10091 CAP_FOR_EACH_U32(__capi)
10092 seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8);
10097 static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
10099 struct io_sq_data *sq = NULL;
10104 * Avoid ABBA deadlock between the seq lock and the io_uring mutex,
10105 * since fdinfo case grabs it in the opposite direction of normal use
10106 * cases. If we fail to get the lock, we just don't iterate any
10107 * structures that could be going away outside the io_uring mutex.
10109 has_lock = mutex_trylock(&ctx->uring_lock);
10111 if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) {
10117 seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1);
10118 seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
10119 seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
10120 for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
10121 struct file *f = io_file_from_index(ctx, i);
10124 seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
10126 seq_printf(m, "%5u: <none>\n", i);
10128 seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
10129 for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
10130 struct io_mapped_ubuf *buf = ctx->user_bufs[i];
10131 unsigned int len = buf->ubuf_end - buf->ubuf;
10133 seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
10135 if (has_lock && !xa_empty(&ctx->personalities)) {
10136 unsigned long index;
10137 const struct cred *cred;
10139 seq_printf(m, "Personalities:\n");
10140 xa_for_each(&ctx->personalities, index, cred)
10141 io_uring_show_cred(m, index, cred);
10143 seq_printf(m, "PollList:\n");
10144 spin_lock(&ctx->completion_lock);
10145 for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
10146 struct hlist_head *list = &ctx->cancel_hash[i];
10147 struct io_kiocb *req;
10149 hlist_for_each_entry(req, list, hash_node)
10150 seq_printf(m, " op=%d, task_works=%d\n", req->opcode,
10151 req->task->task_works != NULL);
10153 spin_unlock(&ctx->completion_lock);
10155 mutex_unlock(&ctx->uring_lock);
10158 static void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
10160 struct io_ring_ctx *ctx = f->private_data;
10162 if (percpu_ref_tryget(&ctx->refs)) {
10163 __io_uring_show_fdinfo(ctx, m);
10164 percpu_ref_put(&ctx->refs);
10169 static const struct file_operations io_uring_fops = {
10170 .release = io_uring_release,
10171 .mmap = io_uring_mmap,
10173 .get_unmapped_area = io_uring_nommu_get_unmapped_area,
10174 .mmap_capabilities = io_uring_nommu_mmap_capabilities,
10176 .poll = io_uring_poll,
10177 #ifdef CONFIG_PROC_FS
10178 .show_fdinfo = io_uring_show_fdinfo,
10182 static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
10183 struct io_uring_params *p)
10185 struct io_rings *rings;
10186 size_t size, sq_array_offset;
10188 /* make sure these are sane, as we already accounted them */
10189 ctx->sq_entries = p->sq_entries;
10190 ctx->cq_entries = p->cq_entries;
10192 size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset);
10193 if (size == SIZE_MAX)
10196 rings = io_mem_alloc(size);
10200 ctx->rings = rings;
10201 ctx->sq_array = (u32 *)((char *)rings + sq_array_offset);
10202 rings->sq_ring_mask = p->sq_entries - 1;
10203 rings->cq_ring_mask = p->cq_entries - 1;
10204 rings->sq_ring_entries = p->sq_entries;
10205 rings->cq_ring_entries = p->cq_entries;
10207 size = array_size(sizeof(struct io_uring_sqe), p->sq_entries);
10208 if (size == SIZE_MAX) {
10209 io_mem_free(ctx->rings);
10214 ctx->sq_sqes = io_mem_alloc(size);
10215 if (!ctx->sq_sqes) {
10216 io_mem_free(ctx->rings);
10224 static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file)
10228 fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC);
10232 ret = io_uring_add_tctx_node(ctx);
10237 fd_install(fd, file);
10242 * Allocate an anonymous fd, this is what constitutes the application
10243 * visible backing of an io_uring instance. The application mmaps this
10244 * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled,
10245 * we have to tie this fd to a socket for file garbage collection purposes.
10247 static struct file *io_uring_get_file(struct io_ring_ctx *ctx)
10250 #if defined(CONFIG_UNIX)
10253 ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP,
10256 return ERR_PTR(ret);
10259 file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx,
10260 O_RDWR | O_CLOEXEC);
10261 #if defined(CONFIG_UNIX)
10262 if (IS_ERR(file)) {
10263 sock_release(ctx->ring_sock);
10264 ctx->ring_sock = NULL;
10266 ctx->ring_sock->file = file;
10272 static int io_uring_create(unsigned entries, struct io_uring_params *p,
10273 struct io_uring_params __user *params)
10275 struct io_ring_ctx *ctx;
10281 if (entries > IORING_MAX_ENTRIES) {
10282 if (!(p->flags & IORING_SETUP_CLAMP))
10284 entries = IORING_MAX_ENTRIES;
10288 * Use twice as many entries for the CQ ring. It's possible for the
10289 * application to drive a higher depth than the size of the SQ ring,
10290 * since the sqes are only used at submission time. This allows for
10291 * some flexibility in overcommitting a bit. If the application has
10292 * set IORING_SETUP_CQSIZE, it will have passed in the desired number
10293 * of CQ ring entries manually.
10295 p->sq_entries = roundup_pow_of_two(entries);
10296 if (p->flags & IORING_SETUP_CQSIZE) {
10298 * If IORING_SETUP_CQSIZE is set, we do the same roundup
10299 * to a power-of-two, if it isn't already. We do NOT impose
10300 * any cq vs sq ring sizing.
10302 if (!p->cq_entries)
10304 if (p->cq_entries > IORING_MAX_CQ_ENTRIES) {
10305 if (!(p->flags & IORING_SETUP_CLAMP))
10307 p->cq_entries = IORING_MAX_CQ_ENTRIES;
10309 p->cq_entries = roundup_pow_of_two(p->cq_entries);
10310 if (p->cq_entries < p->sq_entries)
10313 p->cq_entries = 2 * p->sq_entries;
10316 ctx = io_ring_ctx_alloc(p);
10319 ctx->compat = in_compat_syscall();
10320 if (!capable(CAP_IPC_LOCK))
10321 ctx->user = get_uid(current_user());
10324 * This is just grabbed for accounting purposes. When a process exits,
10325 * the mm is exited and dropped before the files, hence we need to hang
10326 * on to this mm purely for the purposes of being able to unaccount
10327 * memory (locked/pinned vm). It's not used for anything else.
10329 mmgrab(current->mm);
10330 ctx->mm_account = current->mm;
10332 ret = io_allocate_scq_urings(ctx, p);
10336 ret = io_sq_offload_create(ctx, p);
10339 /* always set a rsrc node */
10340 ret = io_rsrc_node_switch_start(ctx);
10343 io_rsrc_node_switch(ctx, NULL);
10345 memset(&p->sq_off, 0, sizeof(p->sq_off));
10346 p->sq_off.head = offsetof(struct io_rings, sq.head);
10347 p->sq_off.tail = offsetof(struct io_rings, sq.tail);
10348 p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask);
10349 p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries);
10350 p->sq_off.flags = offsetof(struct io_rings, sq_flags);
10351 p->sq_off.dropped = offsetof(struct io_rings, sq_dropped);
10352 p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings;
10354 memset(&p->cq_off, 0, sizeof(p->cq_off));
10355 p->cq_off.head = offsetof(struct io_rings, cq.head);
10356 p->cq_off.tail = offsetof(struct io_rings, cq.tail);
10357 p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask);
10358 p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries);
10359 p->cq_off.overflow = offsetof(struct io_rings, cq_overflow);
10360 p->cq_off.cqes = offsetof(struct io_rings, cqes);
10361 p->cq_off.flags = offsetof(struct io_rings, cq_flags);
10363 p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP |
10364 IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS |
10365 IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL |
10366 IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED |
10367 IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS |
10368 IORING_FEAT_RSRC_TAGS;
10370 if (copy_to_user(params, p, sizeof(*p))) {
10375 file = io_uring_get_file(ctx);
10376 if (IS_ERR(file)) {
10377 ret = PTR_ERR(file);
10382 * Install ring fd as the very last thing, so we don't risk someone
10383 * having closed it before we finish setup
10385 ret = io_uring_install_fd(ctx, file);
10387 /* fput will clean it up */
10392 trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags);
10395 io_ring_ctx_wait_and_kill(ctx);
10400 * Sets up an aio uring context, and returns the fd. Applications asks for a
10401 * ring size, we return the actual sq/cq ring sizes (among other things) in the
10402 * params structure passed in.
10404 static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
10406 struct io_uring_params p;
10409 if (copy_from_user(&p, params, sizeof(p)))
10411 for (i = 0; i < ARRAY_SIZE(p.resv); i++) {
10416 if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL |
10417 IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE |
10418 IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ |
10419 IORING_SETUP_R_DISABLED))
10422 return io_uring_create(entries, &p, params);
10425 SYSCALL_DEFINE2(io_uring_setup, u32, entries,
10426 struct io_uring_params __user *, params)
10428 return io_uring_setup(entries, params);
10431 static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args)
10433 struct io_uring_probe *p;
10437 size = struct_size(p, ops, nr_args);
10438 if (size == SIZE_MAX)
10440 p = kzalloc(size, GFP_KERNEL);
10445 if (copy_from_user(p, arg, size))
10448 if (memchr_inv(p, 0, size))
10451 p->last_op = IORING_OP_LAST - 1;
10452 if (nr_args > IORING_OP_LAST)
10453 nr_args = IORING_OP_LAST;
10455 for (i = 0; i < nr_args; i++) {
10457 if (!io_op_defs[i].not_supported)
10458 p->ops[i].flags = IO_URING_OP_SUPPORTED;
10463 if (copy_to_user(arg, p, size))
10470 static int io_register_personality(struct io_ring_ctx *ctx)
10472 const struct cred *creds;
10476 creds = get_current_cred();
10478 ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds,
10479 XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL);
10487 static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,
10488 unsigned int nr_args)
10490 struct io_uring_restriction *res;
10494 /* Restrictions allowed only if rings started disabled */
10495 if (!(ctx->flags & IORING_SETUP_R_DISABLED))
10498 /* We allow only a single restrictions registration */
10499 if (ctx->restrictions.registered)
10502 if (!arg || nr_args > IORING_MAX_RESTRICTIONS)
10505 size = array_size(nr_args, sizeof(*res));
10506 if (size == SIZE_MAX)
10509 res = memdup_user(arg, size);
10511 return PTR_ERR(res);
10515 for (i = 0; i < nr_args; i++) {
10516 switch (res[i].opcode) {
10517 case IORING_RESTRICTION_REGISTER_OP:
10518 if (res[i].register_op >= IORING_REGISTER_LAST) {
10523 __set_bit(res[i].register_op,
10524 ctx->restrictions.register_op);
10526 case IORING_RESTRICTION_SQE_OP:
10527 if (res[i].sqe_op >= IORING_OP_LAST) {
10532 __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op);
10534 case IORING_RESTRICTION_SQE_FLAGS_ALLOWED:
10535 ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags;
10537 case IORING_RESTRICTION_SQE_FLAGS_REQUIRED:
10538 ctx->restrictions.sqe_flags_required = res[i].sqe_flags;
10547 /* Reset all restrictions if an error happened */
10549 memset(&ctx->restrictions, 0, sizeof(ctx->restrictions));
10551 ctx->restrictions.registered = true;
10557 static int io_register_enable_rings(struct io_ring_ctx *ctx)
10559 if (!(ctx->flags & IORING_SETUP_R_DISABLED))
10562 if (ctx->restrictions.registered)
10563 ctx->restricted = 1;
10565 ctx->flags &= ~IORING_SETUP_R_DISABLED;
10566 if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait))
10567 wake_up(&ctx->sq_data->wait);
10571 static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
10572 struct io_uring_rsrc_update2 *up,
10580 if (check_add_overflow(up->offset, nr_args, &tmp))
10582 err = io_rsrc_node_switch_start(ctx);
10587 case IORING_RSRC_FILE:
10588 return __io_sqe_files_update(ctx, up, nr_args);
10589 case IORING_RSRC_BUFFER:
10590 return __io_sqe_buffers_update(ctx, up, nr_args);
10595 static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
10598 struct io_uring_rsrc_update2 up;
10602 memset(&up, 0, sizeof(up));
10603 if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update)))
10605 return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args);
10608 static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
10609 unsigned size, unsigned type)
10611 struct io_uring_rsrc_update2 up;
10613 if (size != sizeof(up))
10615 if (copy_from_user(&up, arg, sizeof(up)))
10617 if (!up.nr || up.resv)
10619 return __io_register_rsrc_update(ctx, type, &up, up.nr);
10622 static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
10623 unsigned int size, unsigned int type)
10625 struct io_uring_rsrc_register rr;
10627 /* keep it extendible */
10628 if (size != sizeof(rr))
10631 memset(&rr, 0, sizeof(rr));
10632 if (copy_from_user(&rr, arg, size))
10634 if (!rr.nr || rr.resv || rr.resv2)
10638 case IORING_RSRC_FILE:
10639 return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data),
10640 rr.nr, u64_to_user_ptr(rr.tags));
10641 case IORING_RSRC_BUFFER:
10642 return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data),
10643 rr.nr, u64_to_user_ptr(rr.tags));
10648 static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg,
10651 struct io_uring_task *tctx = current->io_uring;
10652 cpumask_var_t new_mask;
10655 if (!tctx || !tctx->io_wq)
10658 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
10661 cpumask_clear(new_mask);
10662 if (len > cpumask_size())
10663 len = cpumask_size();
10665 if (copy_from_user(new_mask, arg, len)) {
10666 free_cpumask_var(new_mask);
10670 ret = io_wq_cpu_affinity(tctx->io_wq, new_mask);
10671 free_cpumask_var(new_mask);
10675 static int io_unregister_iowq_aff(struct io_ring_ctx *ctx)
10677 struct io_uring_task *tctx = current->io_uring;
10679 if (!tctx || !tctx->io_wq)
10682 return io_wq_cpu_affinity(tctx->io_wq, NULL);
10685 static int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
10687 __must_hold(&ctx->uring_lock)
10689 struct io_tctx_node *node;
10690 struct io_uring_task *tctx = NULL;
10691 struct io_sq_data *sqd = NULL;
10692 __u32 new_count[2];
10695 if (copy_from_user(new_count, arg, sizeof(new_count)))
10697 for (i = 0; i < ARRAY_SIZE(new_count); i++)
10698 if (new_count[i] > INT_MAX)
10701 if (ctx->flags & IORING_SETUP_SQPOLL) {
10702 sqd = ctx->sq_data;
10705 * Observe the correct sqd->lock -> ctx->uring_lock
10706 * ordering. Fine to drop uring_lock here, we hold
10707 * a ref to the ctx.
10709 refcount_inc(&sqd->refs);
10710 mutex_unlock(&ctx->uring_lock);
10711 mutex_lock(&sqd->lock);
10712 mutex_lock(&ctx->uring_lock);
10714 tctx = sqd->thread->io_uring;
10717 tctx = current->io_uring;
10720 BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits));
10722 for (i = 0; i < ARRAY_SIZE(new_count); i++)
10724 ctx->iowq_limits[i] = new_count[i];
10725 ctx->iowq_limits_set = true;
10728 if (tctx && tctx->io_wq) {
10729 ret = io_wq_max_workers(tctx->io_wq, new_count);
10733 memset(new_count, 0, sizeof(new_count));
10737 mutex_unlock(&sqd->lock);
10738 io_put_sq_data(sqd);
10741 if (copy_to_user(arg, new_count, sizeof(new_count)))
10744 /* that's it for SQPOLL, only the SQPOLL task creates requests */
10748 /* now propagate the restriction to all registered users */
10749 list_for_each_entry(node, &ctx->tctx_list, ctx_node) {
10750 struct io_uring_task *tctx = node->task->io_uring;
10752 if (WARN_ON_ONCE(!tctx->io_wq))
10755 for (i = 0; i < ARRAY_SIZE(new_count); i++)
10756 new_count[i] = ctx->iowq_limits[i];
10757 /* ignore errors, it always returns zero anyway */
10758 (void)io_wq_max_workers(tctx->io_wq, new_count);
10763 mutex_unlock(&sqd->lock);
10764 io_put_sq_data(sqd);
10769 static bool io_register_op_must_quiesce(int op)
10772 case IORING_REGISTER_BUFFERS:
10773 case IORING_UNREGISTER_BUFFERS:
10774 case IORING_REGISTER_FILES:
10775 case IORING_UNREGISTER_FILES:
10776 case IORING_REGISTER_FILES_UPDATE:
10777 case IORING_REGISTER_PROBE:
10778 case IORING_REGISTER_PERSONALITY:
10779 case IORING_UNREGISTER_PERSONALITY:
10780 case IORING_REGISTER_FILES2:
10781 case IORING_REGISTER_FILES_UPDATE2:
10782 case IORING_REGISTER_BUFFERS2:
10783 case IORING_REGISTER_BUFFERS_UPDATE:
10784 case IORING_REGISTER_IOWQ_AFF:
10785 case IORING_UNREGISTER_IOWQ_AFF:
10786 case IORING_REGISTER_IOWQ_MAX_WORKERS:
10793 static int io_ctx_quiesce(struct io_ring_ctx *ctx)
10797 percpu_ref_kill(&ctx->refs);
10800 * Drop uring mutex before waiting for references to exit. If another
10801 * thread is currently inside io_uring_enter() it might need to grab the
10802 * uring_lock to make progress. If we hold it here across the drain
10803 * wait, then we can deadlock. It's safe to drop the mutex here, since
10804 * no new references will come in after we've killed the percpu ref.
10806 mutex_unlock(&ctx->uring_lock);
10808 ret = wait_for_completion_interruptible(&ctx->ref_comp);
10811 ret = io_run_task_work_sig();
10812 } while (ret >= 0);
10813 mutex_lock(&ctx->uring_lock);
10816 io_refs_resurrect(&ctx->refs, &ctx->ref_comp);
10820 static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
10821 void __user *arg, unsigned nr_args)
10822 __releases(ctx->uring_lock)
10823 __acquires(ctx->uring_lock)
10828 * We're inside the ring mutex, if the ref is already dying, then
10829 * someone else killed the ctx or is already going through
10830 * io_uring_register().
10832 if (percpu_ref_is_dying(&ctx->refs))
10835 if (ctx->restricted) {
10836 if (opcode >= IORING_REGISTER_LAST)
10838 opcode = array_index_nospec(opcode, IORING_REGISTER_LAST);
10839 if (!test_bit(opcode, ctx->restrictions.register_op))
10843 if (io_register_op_must_quiesce(opcode)) {
10844 ret = io_ctx_quiesce(ctx);
10850 case IORING_REGISTER_BUFFERS:
10851 ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL);
10853 case IORING_UNREGISTER_BUFFERS:
10855 if (arg || nr_args)
10857 ret = io_sqe_buffers_unregister(ctx);
10859 case IORING_REGISTER_FILES:
10860 ret = io_sqe_files_register(ctx, arg, nr_args, NULL);
10862 case IORING_UNREGISTER_FILES:
10864 if (arg || nr_args)
10866 ret = io_sqe_files_unregister(ctx);
10868 case IORING_REGISTER_FILES_UPDATE:
10869 ret = io_register_files_update(ctx, arg, nr_args);
10871 case IORING_REGISTER_EVENTFD:
10872 case IORING_REGISTER_EVENTFD_ASYNC:
10876 ret = io_eventfd_register(ctx, arg);
10879 if (opcode == IORING_REGISTER_EVENTFD_ASYNC)
10880 ctx->eventfd_async = 1;
10882 ctx->eventfd_async = 0;
10884 case IORING_UNREGISTER_EVENTFD:
10886 if (arg || nr_args)
10888 ret = io_eventfd_unregister(ctx);
10890 case IORING_REGISTER_PROBE:
10892 if (!arg || nr_args > 256)
10894 ret = io_probe(ctx, arg, nr_args);
10896 case IORING_REGISTER_PERSONALITY:
10898 if (arg || nr_args)
10900 ret = io_register_personality(ctx);
10902 case IORING_UNREGISTER_PERSONALITY:
10906 ret = io_unregister_personality(ctx, nr_args);
10908 case IORING_REGISTER_ENABLE_RINGS:
10910 if (arg || nr_args)
10912 ret = io_register_enable_rings(ctx);
10914 case IORING_REGISTER_RESTRICTIONS:
10915 ret = io_register_restrictions(ctx, arg, nr_args);
10917 case IORING_REGISTER_FILES2:
10918 ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE);
10920 case IORING_REGISTER_FILES_UPDATE2:
10921 ret = io_register_rsrc_update(ctx, arg, nr_args,
10924 case IORING_REGISTER_BUFFERS2:
10925 ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER);
10927 case IORING_REGISTER_BUFFERS_UPDATE:
10928 ret = io_register_rsrc_update(ctx, arg, nr_args,
10929 IORING_RSRC_BUFFER);
10931 case IORING_REGISTER_IOWQ_AFF:
10933 if (!arg || !nr_args)
10935 ret = io_register_iowq_aff(ctx, arg, nr_args);
10937 case IORING_UNREGISTER_IOWQ_AFF:
10939 if (arg || nr_args)
10941 ret = io_unregister_iowq_aff(ctx);
10943 case IORING_REGISTER_IOWQ_MAX_WORKERS:
10945 if (!arg || nr_args != 2)
10947 ret = io_register_iowq_max_workers(ctx, arg);
10954 if (io_register_op_must_quiesce(opcode)) {
10955 /* bring the ctx back to life */
10956 percpu_ref_reinit(&ctx->refs);
10957 reinit_completion(&ctx->ref_comp);
10962 SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
10963 void __user *, arg, unsigned int, nr_args)
10965 struct io_ring_ctx *ctx;
10974 if (f.file->f_op != &io_uring_fops)
10977 ctx = f.file->private_data;
10979 io_run_task_work();
10981 mutex_lock(&ctx->uring_lock);
10982 ret = __io_uring_register(ctx, opcode, arg, nr_args);
10983 mutex_unlock(&ctx->uring_lock);
10984 trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs,
10985 ctx->cq_ev_fd != NULL, ret);
10991 static int __init io_uring_init(void)
10993 #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \
10994 BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \
10995 BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \
10998 #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \
10999 __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename)
11000 BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64);
11001 BUILD_BUG_SQE_ELEM(0, __u8, opcode);
11002 BUILD_BUG_SQE_ELEM(1, __u8, flags);
11003 BUILD_BUG_SQE_ELEM(2, __u16, ioprio);
11004 BUILD_BUG_SQE_ELEM(4, __s32, fd);
11005 BUILD_BUG_SQE_ELEM(8, __u64, off);
11006 BUILD_BUG_SQE_ELEM(8, __u64, addr2);
11007 BUILD_BUG_SQE_ELEM(16, __u64, addr);
11008 BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in);
11009 BUILD_BUG_SQE_ELEM(24, __u32, len);
11010 BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags);
11011 BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags);
11012 BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags);
11013 BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags);
11014 BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events);
11015 BUILD_BUG_SQE_ELEM(28, __u32, poll32_events);
11016 BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags);
11017 BUILD_BUG_SQE_ELEM(28, __u32, msg_flags);
11018 BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags);
11019 BUILD_BUG_SQE_ELEM(28, __u32, accept_flags);
11020 BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags);
11021 BUILD_BUG_SQE_ELEM(28, __u32, open_flags);
11022 BUILD_BUG_SQE_ELEM(28, __u32, statx_flags);
11023 BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice);
11024 BUILD_BUG_SQE_ELEM(28, __u32, splice_flags);
11025 BUILD_BUG_SQE_ELEM(32, __u64, user_data);
11026 BUILD_BUG_SQE_ELEM(40, __u16, buf_index);
11027 BUILD_BUG_SQE_ELEM(40, __u16, buf_group);
11028 BUILD_BUG_SQE_ELEM(42, __u16, personality);
11029 BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in);
11030 BUILD_BUG_SQE_ELEM(44, __u32, file_index);
11032 BUILD_BUG_ON(sizeof(struct io_uring_files_update) !=
11033 sizeof(struct io_uring_rsrc_update));
11034 BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) >
11035 sizeof(struct io_uring_rsrc_update2));
11037 /* ->buf_index is u16 */
11038 BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16));
11040 /* should fit into one byte */
11041 BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8));
11043 BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
11044 BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int));
11046 req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC |
11050 __initcall(io_uring_init);