Commit | Line | Data |
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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
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 | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
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 | |
23 | * head will do). | |
24 | * | |
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 | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
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. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
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> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
2b188cc1 | 60 | #include <linux/blkdev.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
ef98eb04 | 81 | #include <linux/tracehook.h> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 93 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 JA |
94 | |
95 | /* | |
96 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
97 | */ | |
98 | #define IORING_FILE_TABLE_SHIFT 9 | |
99 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
100 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
101 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
21b55dbc SG |
102 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
103 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 104 | |
2d091d62 PB |
105 | #define IO_RSRC_TAG_TABLE_SHIFT 9 |
106 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) | |
107 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
108 | ||
489809e2 PB |
109 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
110 | ||
b16fed66 PB |
111 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
112 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
113 | IOSQE_BUFFER_SELECT) | |
c854357b PB |
114 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
115 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) | |
b16fed66 | 116 | |
09899b19 PB |
117 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
118 | ||
2b188cc1 JA |
119 | struct io_uring { |
120 | u32 head ____cacheline_aligned_in_smp; | |
121 | u32 tail ____cacheline_aligned_in_smp; | |
122 | }; | |
123 | ||
1e84b97b | 124 | /* |
75b28aff HV |
125 | * This data is shared with the application through the mmap at offsets |
126 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
127 | * |
128 | * The offsets to the member fields are published through struct | |
129 | * io_sqring_offsets when calling io_uring_setup. | |
130 | */ | |
75b28aff | 131 | struct io_rings { |
1e84b97b SB |
132 | /* |
133 | * Head and tail offsets into the ring; the offsets need to be | |
134 | * masked to get valid indices. | |
135 | * | |
75b28aff HV |
136 | * The kernel controls head of the sq ring and the tail of the cq ring, |
137 | * and the application controls tail of the sq ring and the head of the | |
138 | * cq ring. | |
1e84b97b | 139 | */ |
75b28aff | 140 | struct io_uring sq, cq; |
1e84b97b | 141 | /* |
75b28aff | 142 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
143 | * ring_entries - 1) |
144 | */ | |
75b28aff HV |
145 | u32 sq_ring_mask, cq_ring_mask; |
146 | /* Ring sizes (constant, power of 2) */ | |
147 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
148 | /* |
149 | * Number of invalid entries dropped by the kernel due to | |
150 | * invalid index stored in array | |
151 | * | |
152 | * Written by the kernel, shouldn't be modified by the | |
153 | * application (i.e. get number of "new events" by comparing to | |
154 | * cached value). | |
155 | * | |
156 | * After a new SQ head value was read by the application this | |
157 | * counter includes all submissions that were dropped reaching | |
158 | * the new SQ head (and possibly more). | |
159 | */ | |
75b28aff | 160 | u32 sq_dropped; |
1e84b97b | 161 | /* |
0d9b5b3a | 162 | * Runtime SQ flags |
1e84b97b SB |
163 | * |
164 | * Written by the kernel, shouldn't be modified by the | |
165 | * application. | |
166 | * | |
167 | * The application needs a full memory barrier before checking | |
168 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
169 | */ | |
75b28aff | 170 | u32 sq_flags; |
0d9b5b3a SG |
171 | /* |
172 | * Runtime CQ flags | |
173 | * | |
174 | * Written by the application, shouldn't be modified by the | |
175 | * kernel. | |
176 | */ | |
fe7e3257 | 177 | u32 cq_flags; |
1e84b97b SB |
178 | /* |
179 | * Number of completion events lost because the queue was full; | |
180 | * this should be avoided by the application by making sure | |
0b4295b5 | 181 | * there are not more requests pending than there is space in |
1e84b97b SB |
182 | * the completion queue. |
183 | * | |
184 | * Written by the kernel, shouldn't be modified by the | |
185 | * application (i.e. get number of "new events" by comparing to | |
186 | * cached value). | |
187 | * | |
188 | * As completion events come in out of order this counter is not | |
189 | * ordered with any other data. | |
190 | */ | |
75b28aff | 191 | u32 cq_overflow; |
1e84b97b SB |
192 | /* |
193 | * Ring buffer of completion events. | |
194 | * | |
195 | * The kernel writes completion events fresh every time they are | |
196 | * produced, so the application is allowed to modify pending | |
197 | * entries. | |
198 | */ | |
75b28aff | 199 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
200 | }; |
201 | ||
45d189c6 PB |
202 | enum io_uring_cmd_flags { |
203 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 204 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
205 | }; |
206 | ||
edafccee JA |
207 | struct io_mapped_ubuf { |
208 | u64 ubuf; | |
4751f53d | 209 | u64 ubuf_end; |
edafccee | 210 | unsigned int nr_bvecs; |
de293938 | 211 | unsigned long acct_pages; |
41edf1a5 | 212 | struct bio_vec bvec[]; |
edafccee JA |
213 | }; |
214 | ||
50238531 BM |
215 | struct io_ring_ctx; |
216 | ||
6c2450ae PB |
217 | struct io_overflow_cqe { |
218 | struct io_uring_cqe cqe; | |
219 | struct list_head list; | |
220 | }; | |
221 | ||
a04b0ac0 PB |
222 | struct io_fixed_file { |
223 | /* file * with additional FFS_* flags */ | |
224 | unsigned long file_ptr; | |
225 | }; | |
226 | ||
269bbe5f BM |
227 | struct io_rsrc_put { |
228 | struct list_head list; | |
b60c8dce | 229 | u64 tag; |
50238531 BM |
230 | union { |
231 | void *rsrc; | |
232 | struct file *file; | |
bd54b6fe | 233 | struct io_mapped_ubuf *buf; |
50238531 | 234 | }; |
269bbe5f BM |
235 | }; |
236 | ||
aeca241b PB |
237 | struct io_file_table { |
238 | /* two level table */ | |
239 | struct io_fixed_file **files; | |
31b51510 JA |
240 | }; |
241 | ||
b895c9a6 | 242 | struct io_rsrc_node { |
05589553 XW |
243 | struct percpu_ref refs; |
244 | struct list_head node; | |
269bbe5f | 245 | struct list_head rsrc_list; |
b895c9a6 | 246 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 247 | struct llist_node llist; |
e297822b | 248 | bool done; |
05589553 XW |
249 | }; |
250 | ||
40ae0ff7 PB |
251 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
252 | ||
b895c9a6 | 253 | struct io_rsrc_data { |
05f3fb3c JA |
254 | struct io_ring_ctx *ctx; |
255 | ||
2d091d62 PB |
256 | u64 **tags; |
257 | unsigned int nr; | |
40ae0ff7 | 258 | rsrc_put_fn *do_put; |
3e942498 | 259 | atomic_t refs; |
05f3fb3c | 260 | struct completion done; |
8bad28d8 | 261 | bool quiesce; |
05f3fb3c JA |
262 | }; |
263 | ||
5a2e745d JA |
264 | struct io_buffer { |
265 | struct list_head list; | |
266 | __u64 addr; | |
d1f82808 | 267 | __u32 len; |
5a2e745d JA |
268 | __u16 bid; |
269 | }; | |
270 | ||
21b55dbc SG |
271 | struct io_restriction { |
272 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
273 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
274 | u8 sqe_flags_allowed; | |
275 | u8 sqe_flags_required; | |
7e84e1c7 | 276 | bool registered; |
21b55dbc SG |
277 | }; |
278 | ||
37d1e2e3 JA |
279 | enum { |
280 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
281 | IO_SQ_THREAD_SHOULD_PARK, | |
282 | }; | |
283 | ||
534ca6d6 JA |
284 | struct io_sq_data { |
285 | refcount_t refs; | |
9e138a48 | 286 | atomic_t park_pending; |
09a6f4ef | 287 | struct mutex lock; |
69fb2131 JA |
288 | |
289 | /* ctx's that are using this sqd */ | |
290 | struct list_head ctx_list; | |
69fb2131 | 291 | |
534ca6d6 JA |
292 | struct task_struct *thread; |
293 | struct wait_queue_head wait; | |
08369246 XW |
294 | |
295 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
296 | int sq_cpu; |
297 | pid_t task_pid; | |
5c2469e0 | 298 | pid_t task_tgid; |
37d1e2e3 JA |
299 | |
300 | unsigned long state; | |
37d1e2e3 | 301 | struct completion exited; |
534ca6d6 JA |
302 | }; |
303 | ||
258b29a9 | 304 | #define IO_IOPOLL_BATCH 8 |
6dd0be1e | 305 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 306 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 307 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
308 | |
309 | struct io_comp_state { | |
6dd0be1e | 310 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 311 | unsigned int nr; |
c7dae4ba | 312 | /* inline/task_work completion list, under ->uring_lock */ |
1b4c351f | 313 | struct list_head free_list; |
258b29a9 PB |
314 | }; |
315 | ||
a1ab7b35 PB |
316 | struct io_submit_link { |
317 | struct io_kiocb *head; | |
318 | struct io_kiocb *last; | |
319 | }; | |
320 | ||
258b29a9 PB |
321 | struct io_submit_state { |
322 | struct blk_plug plug; | |
a1ab7b35 | 323 | struct io_submit_link link; |
258b29a9 PB |
324 | |
325 | /* | |
326 | * io_kiocb alloc cache | |
327 | */ | |
bf019da7 | 328 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
329 | unsigned int free_reqs; |
330 | ||
331 | bool plug_started; | |
332 | ||
333 | /* | |
334 | * Batch completion logic | |
335 | */ | |
336 | struct io_comp_state comp; | |
337 | ||
338 | /* | |
339 | * File reference cache | |
340 | */ | |
341 | struct file *file; | |
342 | unsigned int fd; | |
343 | unsigned int file_refs; | |
344 | unsigned int ios_left; | |
345 | }; | |
346 | ||
2b188cc1 | 347 | struct io_ring_ctx { |
b52ecf8c | 348 | /* const or read-mostly hot data */ |
2b188cc1 JA |
349 | struct { |
350 | struct percpu_ref refs; | |
2b188cc1 | 351 | |
b52ecf8c | 352 | struct io_rings *rings; |
2b188cc1 | 353 | unsigned int flags; |
e1d85334 | 354 | unsigned int compat: 1; |
e1d85334 RD |
355 | unsigned int drain_next: 1; |
356 | unsigned int eventfd_async: 1; | |
21b55dbc | 357 | unsigned int restricted: 1; |
f18ee4cf | 358 | unsigned int off_timeout_used: 1; |
10c66904 | 359 | unsigned int drain_active: 1; |
b52ecf8c | 360 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 361 | |
7f1129d2 | 362 | /* submission data */ |
b52ecf8c | 363 | struct { |
0499e582 PB |
364 | struct mutex uring_lock; |
365 | ||
75b28aff HV |
366 | /* |
367 | * Ring buffer of indices into array of io_uring_sqe, which is | |
368 | * mmapped by the application using the IORING_OFF_SQES offset. | |
369 | * | |
370 | * This indirection could e.g. be used to assign fixed | |
371 | * io_uring_sqe entries to operations and only submit them to | |
372 | * the queue when needed. | |
373 | * | |
374 | * The kernel modifies neither the indices array nor the entries | |
375 | * array. | |
376 | */ | |
377 | u32 *sq_array; | |
c7af47cf | 378 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
379 | unsigned cached_sq_head; |
380 | unsigned sq_entries; | |
de0617e4 | 381 | struct list_head defer_list; |
7f1129d2 PB |
382 | |
383 | /* | |
384 | * Fixed resources fast path, should be accessed only under | |
385 | * uring_lock, and updated through io_uring_register(2) | |
386 | */ | |
387 | struct io_rsrc_node *rsrc_node; | |
388 | struct io_file_table file_table; | |
389 | unsigned nr_user_files; | |
390 | unsigned nr_user_bufs; | |
391 | struct io_mapped_ubuf **user_bufs; | |
392 | ||
393 | struct io_submit_state submit_state; | |
5262f567 | 394 | struct list_head timeout_list; |
1d7bb1d5 | 395 | struct list_head cq_overflow_list; |
7f1129d2 PB |
396 | struct xarray io_buffers; |
397 | struct xarray personalities; | |
398 | u32 pers_next; | |
399 | unsigned sq_thread_idle; | |
2b188cc1 JA |
400 | } ____cacheline_aligned_in_smp; |
401 | ||
d0acdee2 PB |
402 | /* IRQ completion list, under ->completion_lock */ |
403 | struct list_head locked_free_list; | |
404 | unsigned int locked_free_nr; | |
3c1a2ead | 405 | |
7c30f36a | 406 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
407 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
408 | ||
90554200 | 409 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 410 | struct list_head sqd_list; |
75b28aff | 411 | |
5ed7a37d PB |
412 | unsigned long check_cq_overflow; |
413 | ||
206aefde JA |
414 | struct { |
415 | unsigned cached_cq_tail; | |
416 | unsigned cq_entries; | |
0499e582 | 417 | struct eventfd_ctx *cq_ev_fd; |
311997b3 | 418 | struct wait_queue_head poll_wait; |
0499e582 PB |
419 | struct wait_queue_head cq_wait; |
420 | unsigned cq_extra; | |
421 | atomic_t cq_timeouts; | |
206aefde | 422 | struct fasync_struct *cq_fasync; |
0499e582 | 423 | unsigned cq_last_tm_flush; |
206aefde | 424 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 425 | |
2b188cc1 JA |
426 | struct { |
427 | spinlock_t completion_lock; | |
e94f141b | 428 | |
def596e9 | 429 | /* |
540e32a0 | 430 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
431 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
432 | * For SQPOLL, only the single threaded io_sq_thread() will | |
433 | * manipulate the list, hence no extra locking is needed there. | |
434 | */ | |
540e32a0 | 435 | struct list_head iopoll_list; |
78076bb6 JA |
436 | struct hlist_head *cancel_hash; |
437 | unsigned cancel_hash_bits; | |
915b3dde | 438 | bool poll_multi_queue; |
2b188cc1 | 439 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 440 | |
21b55dbc | 441 | struct io_restriction restrictions; |
3c1a2ead | 442 | |
b13a8918 PB |
443 | /* slow path rsrc auxilary data, used by update/register */ |
444 | struct { | |
445 | struct io_rsrc_node *rsrc_backup_node; | |
446 | struct io_mapped_ubuf *dummy_ubuf; | |
447 | struct io_rsrc_data *file_data; | |
448 | struct io_rsrc_data *buf_data; | |
449 | ||
450 | struct delayed_work rsrc_put_work; | |
451 | struct llist_head rsrc_put_llist; | |
452 | struct list_head rsrc_ref_list; | |
453 | spinlock_t rsrc_ref_lock; | |
454 | }; | |
455 | ||
3c1a2ead | 456 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
457 | struct { |
458 | #if defined(CONFIG_UNIX) | |
459 | struct socket *ring_sock; | |
460 | #endif | |
461 | /* hashed buffered write serialization */ | |
462 | struct io_wq_hash *hash_map; | |
463 | ||
464 | /* Only used for accounting purposes */ | |
465 | struct user_struct *user; | |
466 | struct mm_struct *mm_account; | |
467 | ||
468 | /* ctx exit and cancelation */ | |
9011bf9a PB |
469 | struct llist_head fallback_llist; |
470 | struct delayed_work fallback_work; | |
b986af7e PB |
471 | struct work_struct exit_work; |
472 | struct list_head tctx_list; | |
473 | struct completion ref_comp; | |
474 | }; | |
2b188cc1 JA |
475 | }; |
476 | ||
53e043b2 SM |
477 | struct io_uring_task { |
478 | /* submission side */ | |
09899b19 | 479 | int cached_refs; |
53e043b2 SM |
480 | struct xarray xa; |
481 | struct wait_queue_head wait; | |
ee53fb2b SM |
482 | const struct io_ring_ctx *last; |
483 | struct io_wq *io_wq; | |
53e043b2 | 484 | struct percpu_counter inflight; |
b303fe2e | 485 | atomic_t inflight_tracked; |
53e043b2 | 486 | atomic_t in_idle; |
53e043b2 SM |
487 | |
488 | spinlock_t task_lock; | |
489 | struct io_wq_work_list task_list; | |
490 | unsigned long task_state; | |
491 | struct callback_head task_work; | |
492 | }; | |
493 | ||
09bb8394 JA |
494 | /* |
495 | * First field must be the file pointer in all the | |
496 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
497 | */ | |
221c5eb2 JA |
498 | struct io_poll_iocb { |
499 | struct file *file; | |
018043be | 500 | struct wait_queue_head *head; |
221c5eb2 | 501 | __poll_t events; |
8c838788 | 502 | bool done; |
221c5eb2 | 503 | bool canceled; |
392edb45 | 504 | struct wait_queue_entry wait; |
221c5eb2 JA |
505 | }; |
506 | ||
9d805892 | 507 | struct io_poll_update { |
018043be | 508 | struct file *file; |
9d805892 PB |
509 | u64 old_user_data; |
510 | u64 new_user_data; | |
511 | __poll_t events; | |
b69de288 JA |
512 | bool update_events; |
513 | bool update_user_data; | |
018043be PB |
514 | }; |
515 | ||
b5dba59e JA |
516 | struct io_close { |
517 | struct file *file; | |
b5dba59e JA |
518 | int fd; |
519 | }; | |
520 | ||
ad8a48ac JA |
521 | struct io_timeout_data { |
522 | struct io_kiocb *req; | |
523 | struct hrtimer timer; | |
524 | struct timespec64 ts; | |
525 | enum hrtimer_mode mode; | |
526 | }; | |
527 | ||
8ed8d3c3 JA |
528 | struct io_accept { |
529 | struct file *file; | |
530 | struct sockaddr __user *addr; | |
531 | int __user *addr_len; | |
532 | int flags; | |
09952e3e | 533 | unsigned long nofile; |
8ed8d3c3 JA |
534 | }; |
535 | ||
536 | struct io_sync { | |
537 | struct file *file; | |
538 | loff_t len; | |
539 | loff_t off; | |
540 | int flags; | |
d63d1b5e | 541 | int mode; |
8ed8d3c3 JA |
542 | }; |
543 | ||
fbf23849 JA |
544 | struct io_cancel { |
545 | struct file *file; | |
546 | u64 addr; | |
547 | }; | |
548 | ||
b29472ee JA |
549 | struct io_timeout { |
550 | struct file *file; | |
bfe68a22 PB |
551 | u32 off; |
552 | u32 target_seq; | |
135fcde8 | 553 | struct list_head list; |
90cd7e42 PB |
554 | /* head of the link, used by linked timeouts only */ |
555 | struct io_kiocb *head; | |
b29472ee JA |
556 | }; |
557 | ||
0bdf7a2d PB |
558 | struct io_timeout_rem { |
559 | struct file *file; | |
560 | u64 addr; | |
9c8e11b3 PB |
561 | |
562 | /* timeout update */ | |
563 | struct timespec64 ts; | |
564 | u32 flags; | |
0bdf7a2d PB |
565 | }; |
566 | ||
9adbd45d JA |
567 | struct io_rw { |
568 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
569 | struct kiocb kiocb; | |
570 | u64 addr; | |
571 | u64 len; | |
572 | }; | |
573 | ||
3fbb51c1 JA |
574 | struct io_connect { |
575 | struct file *file; | |
576 | struct sockaddr __user *addr; | |
577 | int addr_len; | |
578 | }; | |
579 | ||
e47293fd JA |
580 | struct io_sr_msg { |
581 | struct file *file; | |
fddaface | 582 | union { |
4af3417a PB |
583 | struct compat_msghdr __user *umsg_compat; |
584 | struct user_msghdr __user *umsg; | |
585 | void __user *buf; | |
fddaface | 586 | }; |
e47293fd | 587 | int msg_flags; |
bcda7baa | 588 | int bgid; |
fddaface | 589 | size_t len; |
bcda7baa | 590 | struct io_buffer *kbuf; |
e47293fd JA |
591 | }; |
592 | ||
15b71abe JA |
593 | struct io_open { |
594 | struct file *file; | |
595 | int dfd; | |
15b71abe | 596 | struct filename *filename; |
c12cedf2 | 597 | struct open_how how; |
4022e7af | 598 | unsigned long nofile; |
15b71abe JA |
599 | }; |
600 | ||
269bbe5f | 601 | struct io_rsrc_update { |
05f3fb3c JA |
602 | struct file *file; |
603 | u64 arg; | |
604 | u32 nr_args; | |
605 | u32 offset; | |
606 | }; | |
607 | ||
4840e418 JA |
608 | struct io_fadvise { |
609 | struct file *file; | |
610 | u64 offset; | |
611 | u32 len; | |
612 | u32 advice; | |
613 | }; | |
614 | ||
c1ca757b JA |
615 | struct io_madvise { |
616 | struct file *file; | |
617 | u64 addr; | |
618 | u32 len; | |
619 | u32 advice; | |
620 | }; | |
621 | ||
3e4827b0 JA |
622 | struct io_epoll { |
623 | struct file *file; | |
624 | int epfd; | |
625 | int op; | |
626 | int fd; | |
627 | struct epoll_event event; | |
e47293fd JA |
628 | }; |
629 | ||
7d67af2c PB |
630 | struct io_splice { |
631 | struct file *file_out; | |
632 | struct file *file_in; | |
633 | loff_t off_out; | |
634 | loff_t off_in; | |
635 | u64 len; | |
636 | unsigned int flags; | |
637 | }; | |
638 | ||
ddf0322d JA |
639 | struct io_provide_buf { |
640 | struct file *file; | |
641 | __u64 addr; | |
38134ada | 642 | __u32 len; |
ddf0322d JA |
643 | __u32 bgid; |
644 | __u16 nbufs; | |
645 | __u16 bid; | |
646 | }; | |
647 | ||
1d9e1288 BM |
648 | struct io_statx { |
649 | struct file *file; | |
650 | int dfd; | |
651 | unsigned int mask; | |
652 | unsigned int flags; | |
e62753e4 | 653 | const char __user *filename; |
1d9e1288 BM |
654 | struct statx __user *buffer; |
655 | }; | |
656 | ||
36f4fa68 JA |
657 | struct io_shutdown { |
658 | struct file *file; | |
659 | int how; | |
660 | }; | |
661 | ||
80a261fd JA |
662 | struct io_rename { |
663 | struct file *file; | |
664 | int old_dfd; | |
665 | int new_dfd; | |
666 | struct filename *oldpath; | |
667 | struct filename *newpath; | |
668 | int flags; | |
669 | }; | |
670 | ||
14a1143b JA |
671 | struct io_unlink { |
672 | struct file *file; | |
673 | int dfd; | |
674 | int flags; | |
675 | struct filename *filename; | |
676 | }; | |
677 | ||
3ca405eb PB |
678 | struct io_completion { |
679 | struct file *file; | |
680 | struct list_head list; | |
8c3f9cd1 | 681 | u32 cflags; |
3ca405eb PB |
682 | }; |
683 | ||
f499a021 JA |
684 | struct io_async_connect { |
685 | struct sockaddr_storage address; | |
686 | }; | |
687 | ||
03b1230c JA |
688 | struct io_async_msghdr { |
689 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
690 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
691 | struct iovec *free_iov; | |
03b1230c JA |
692 | struct sockaddr __user *uaddr; |
693 | struct msghdr msg; | |
b537916c | 694 | struct sockaddr_storage addr; |
03b1230c JA |
695 | }; |
696 | ||
f67676d1 JA |
697 | struct io_async_rw { |
698 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
699 | const struct iovec *free_iovec; |
700 | struct iov_iter iter; | |
227c0c96 | 701 | size_t bytes_done; |
bcf5a063 | 702 | struct wait_page_queue wpq; |
f67676d1 JA |
703 | }; |
704 | ||
6b47ee6e PB |
705 | enum { |
706 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
707 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
708 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
709 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
710 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 711 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 712 | |
dddca226 | 713 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 714 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
715 | REQ_F_INFLIGHT_BIT, |
716 | REQ_F_CUR_POS_BIT, | |
717 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 718 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 719 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 720 | REQ_F_POLLED_BIT, |
bcda7baa | 721 | REQ_F_BUFFER_SELECTED_BIT, |
900fad45 | 722 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 723 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 724 | REQ_F_REISSUE_BIT, |
8c130827 | 725 | REQ_F_DONT_REISSUE_BIT, |
b8e64b53 | 726 | REQ_F_CREDS_BIT, |
7b29f92d JA |
727 | /* keep async read/write and isreg together and in order */ |
728 | REQ_F_ASYNC_READ_BIT, | |
729 | REQ_F_ASYNC_WRITE_BIT, | |
730 | REQ_F_ISREG_BIT, | |
84557871 JA |
731 | |
732 | /* not a real bit, just to check we're not overflowing the space */ | |
733 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
734 | }; |
735 | ||
736 | enum { | |
737 | /* ctx owns file */ | |
738 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
739 | /* drain existing IO first */ | |
740 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
741 | /* linked sqes */ | |
742 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
743 | /* doesn't sever on completion < 0 */ | |
744 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
745 | /* IOSQE_ASYNC */ | |
746 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
747 | /* IOSQE_BUFFER_SELECT */ |
748 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 749 | |
6b47ee6e | 750 | /* fail rest of links */ |
93d2bcd2 | 751 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 752 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
753 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
754 | /* read/write uses file position */ | |
755 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
756 | /* must not punt to workers */ | |
757 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 758 | /* has or had linked timeout */ |
6b47ee6e | 759 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
760 | /* needs cleanup */ |
761 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
762 | /* already went through poll handler */ |
763 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
764 | /* buffer already selected */ |
765 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
900fad45 PB |
766 | /* linked timeout is active, i.e. prepared by link's head */ |
767 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
768 | /* completion is deferred through io_comp_state */ |
769 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
770 | /* caller should reissue async */ |
771 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
772 | /* don't attempt request reissue, see io_rw_reissue() */ |
773 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d JA |
774 | /* supports async reads */ |
775 | REQ_F_ASYNC_READ = BIT(REQ_F_ASYNC_READ_BIT), | |
776 | /* supports async writes */ | |
777 | REQ_F_ASYNC_WRITE = BIT(REQ_F_ASYNC_WRITE_BIT), | |
778 | /* regular file */ | |
779 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
780 | /* has creds assigned */ |
781 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
d7718a9d JA |
782 | }; |
783 | ||
784 | struct async_poll { | |
785 | struct io_poll_iocb poll; | |
807abcb0 | 786 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
787 | }; |
788 | ||
5b0a6acc PB |
789 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req); |
790 | ||
7cbf1722 | 791 | struct io_task_work { |
5b0a6acc PB |
792 | union { |
793 | struct io_wq_work_node node; | |
794 | struct llist_node fallback_node; | |
795 | }; | |
796 | io_req_tw_func_t func; | |
7cbf1722 JA |
797 | }; |
798 | ||
992da01a PB |
799 | enum { |
800 | IORING_RSRC_FILE = 0, | |
801 | IORING_RSRC_BUFFER = 1, | |
802 | }; | |
803 | ||
09bb8394 JA |
804 | /* |
805 | * NOTE! Each of the iocb union members has the file pointer | |
806 | * as the first entry in their struct definition. So you can | |
807 | * access the file pointer through any of the sub-structs, | |
808 | * or directly as just 'ki_filp' in this struct. | |
809 | */ | |
2b188cc1 | 810 | struct io_kiocb { |
221c5eb2 | 811 | union { |
09bb8394 | 812 | struct file *file; |
9adbd45d | 813 | struct io_rw rw; |
221c5eb2 | 814 | struct io_poll_iocb poll; |
9d805892 | 815 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
816 | struct io_accept accept; |
817 | struct io_sync sync; | |
fbf23849 | 818 | struct io_cancel cancel; |
b29472ee | 819 | struct io_timeout timeout; |
0bdf7a2d | 820 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 821 | struct io_connect connect; |
e47293fd | 822 | struct io_sr_msg sr_msg; |
15b71abe | 823 | struct io_open open; |
b5dba59e | 824 | struct io_close close; |
269bbe5f | 825 | struct io_rsrc_update rsrc_update; |
4840e418 | 826 | struct io_fadvise fadvise; |
c1ca757b | 827 | struct io_madvise madvise; |
3e4827b0 | 828 | struct io_epoll epoll; |
7d67af2c | 829 | struct io_splice splice; |
ddf0322d | 830 | struct io_provide_buf pbuf; |
1d9e1288 | 831 | struct io_statx statx; |
36f4fa68 | 832 | struct io_shutdown shutdown; |
80a261fd | 833 | struct io_rename rename; |
14a1143b | 834 | struct io_unlink unlink; |
3ca405eb PB |
835 | /* use only after cleaning per-op data, see io_clean_op() */ |
836 | struct io_completion compl; | |
221c5eb2 | 837 | }; |
2b188cc1 | 838 | |
e8c2bc1f JA |
839 | /* opcode allocated if it needs to store data for async defer */ |
840 | void *async_data; | |
d625c6ee | 841 | u8 opcode; |
65a6543d XW |
842 | /* polled IO has completed */ |
843 | u8 iopoll_completed; | |
2b188cc1 | 844 | |
4f4eeba8 | 845 | u16 buf_index; |
9cf7c104 | 846 | u32 result; |
4f4eeba8 | 847 | |
010e8e6b PB |
848 | struct io_ring_ctx *ctx; |
849 | unsigned int flags; | |
abc54d63 | 850 | atomic_t refs; |
010e8e6b PB |
851 | struct task_struct *task; |
852 | u64 user_data; | |
d7718a9d | 853 | |
f2f87370 | 854 | struct io_kiocb *link; |
269bbe5f | 855 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 856 | |
b303fe2e | 857 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 858 | struct list_head inflight_entry; |
5b0a6acc | 859 | struct io_task_work io_task_work; |
010e8e6b PB |
860 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
861 | struct hlist_node hash_node; | |
862 | struct async_poll *apoll; | |
863 | struct io_wq_work work; | |
fe7e3257 | 864 | const struct cred *creds; |
c10d1f98 | 865 | |
eae071c9 PB |
866 | /* store used ubuf, so we can prevent reloading */ |
867 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 868 | }; |
05589553 | 869 | |
13bf43f5 PB |
870 | struct io_tctx_node { |
871 | struct list_head ctx_node; | |
872 | struct task_struct *task; | |
13bf43f5 PB |
873 | struct io_ring_ctx *ctx; |
874 | }; | |
875 | ||
27dc8338 PB |
876 | struct io_defer_entry { |
877 | struct list_head list; | |
878 | struct io_kiocb *req; | |
9cf7c104 | 879 | u32 seq; |
2b188cc1 JA |
880 | }; |
881 | ||
d3656344 | 882 | struct io_op_def { |
d3656344 JA |
883 | /* needs req->file assigned */ |
884 | unsigned needs_file : 1; | |
d3656344 JA |
885 | /* hash wq insertion if file is a regular file */ |
886 | unsigned hash_reg_file : 1; | |
887 | /* unbound wq insertion if file is a non-regular file */ | |
888 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
889 | /* opcode is not supported by this kernel */ |
890 | unsigned not_supported : 1; | |
8a72758c JA |
891 | /* set if opcode supports polled "wait" */ |
892 | unsigned pollin : 1; | |
893 | unsigned pollout : 1; | |
bcda7baa JA |
894 | /* op supports buffer selection */ |
895 | unsigned buffer_select : 1; | |
26f0505a PB |
896 | /* do prep async if is going to be punted */ |
897 | unsigned needs_async_setup : 1; | |
27926b68 JA |
898 | /* should block plug */ |
899 | unsigned plug : 1; | |
e8c2bc1f JA |
900 | /* size of async data needed, if any */ |
901 | unsigned short async_size; | |
d3656344 JA |
902 | }; |
903 | ||
0918682b | 904 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
905 | [IORING_OP_NOP] = {}, |
906 | [IORING_OP_READV] = { | |
d3656344 JA |
907 | .needs_file = 1, |
908 | .unbound_nonreg_file = 1, | |
8a72758c | 909 | .pollin = 1, |
4d954c25 | 910 | .buffer_select = 1, |
26f0505a | 911 | .needs_async_setup = 1, |
27926b68 | 912 | .plug = 1, |
e8c2bc1f | 913 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 914 | }, |
0463b6c5 | 915 | [IORING_OP_WRITEV] = { |
d3656344 JA |
916 | .needs_file = 1, |
917 | .hash_reg_file = 1, | |
918 | .unbound_nonreg_file = 1, | |
8a72758c | 919 | .pollout = 1, |
26f0505a | 920 | .needs_async_setup = 1, |
27926b68 | 921 | .plug = 1, |
e8c2bc1f | 922 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 923 | }, |
0463b6c5 | 924 | [IORING_OP_FSYNC] = { |
d3656344 JA |
925 | .needs_file = 1, |
926 | }, | |
0463b6c5 | 927 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
928 | .needs_file = 1, |
929 | .unbound_nonreg_file = 1, | |
8a72758c | 930 | .pollin = 1, |
27926b68 | 931 | .plug = 1, |
e8c2bc1f | 932 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 933 | }, |
0463b6c5 | 934 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
935 | .needs_file = 1, |
936 | .hash_reg_file = 1, | |
937 | .unbound_nonreg_file = 1, | |
8a72758c | 938 | .pollout = 1, |
27926b68 | 939 | .plug = 1, |
e8c2bc1f | 940 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 941 | }, |
0463b6c5 | 942 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
943 | .needs_file = 1, |
944 | .unbound_nonreg_file = 1, | |
945 | }, | |
0463b6c5 PB |
946 | [IORING_OP_POLL_REMOVE] = {}, |
947 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
948 | .needs_file = 1, |
949 | }, | |
0463b6c5 | 950 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
951 | .needs_file = 1, |
952 | .unbound_nonreg_file = 1, | |
8a72758c | 953 | .pollout = 1, |
26f0505a | 954 | .needs_async_setup = 1, |
e8c2bc1f | 955 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 956 | }, |
0463b6c5 | 957 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
958 | .needs_file = 1, |
959 | .unbound_nonreg_file = 1, | |
8a72758c | 960 | .pollin = 1, |
52de1fe1 | 961 | .buffer_select = 1, |
26f0505a | 962 | .needs_async_setup = 1, |
e8c2bc1f | 963 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 964 | }, |
0463b6c5 | 965 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 966 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 967 | }, |
9c8e11b3 PB |
968 | [IORING_OP_TIMEOUT_REMOVE] = { |
969 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 970 | }, |
0463b6c5 | 971 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
972 | .needs_file = 1, |
973 | .unbound_nonreg_file = 1, | |
8a72758c | 974 | .pollin = 1, |
d3656344 | 975 | }, |
0463b6c5 PB |
976 | [IORING_OP_ASYNC_CANCEL] = {}, |
977 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 978 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 979 | }, |
0463b6c5 | 980 | [IORING_OP_CONNECT] = { |
d3656344 JA |
981 | .needs_file = 1, |
982 | .unbound_nonreg_file = 1, | |
8a72758c | 983 | .pollout = 1, |
26f0505a | 984 | .needs_async_setup = 1, |
e8c2bc1f | 985 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 986 | }, |
0463b6c5 | 987 | [IORING_OP_FALLOCATE] = { |
d3656344 | 988 | .needs_file = 1, |
d3656344 | 989 | }, |
44526bed JA |
990 | [IORING_OP_OPENAT] = {}, |
991 | [IORING_OP_CLOSE] = {}, | |
992 | [IORING_OP_FILES_UPDATE] = {}, | |
993 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 994 | [IORING_OP_READ] = { |
3a6820f2 JA |
995 | .needs_file = 1, |
996 | .unbound_nonreg_file = 1, | |
8a72758c | 997 | .pollin = 1, |
bcda7baa | 998 | .buffer_select = 1, |
27926b68 | 999 | .plug = 1, |
e8c2bc1f | 1000 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1001 | }, |
0463b6c5 | 1002 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
1003 | .needs_file = 1, |
1004 | .unbound_nonreg_file = 1, | |
8a72758c | 1005 | .pollout = 1, |
27926b68 | 1006 | .plug = 1, |
e8c2bc1f | 1007 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1008 | }, |
0463b6c5 | 1009 | [IORING_OP_FADVISE] = { |
4840e418 | 1010 | .needs_file = 1, |
c1ca757b | 1011 | }, |
44526bed | 1012 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1013 | [IORING_OP_SEND] = { |
fddaface JA |
1014 | .needs_file = 1, |
1015 | .unbound_nonreg_file = 1, | |
8a72758c | 1016 | .pollout = 1, |
fddaface | 1017 | }, |
0463b6c5 | 1018 | [IORING_OP_RECV] = { |
fddaface JA |
1019 | .needs_file = 1, |
1020 | .unbound_nonreg_file = 1, | |
8a72758c | 1021 | .pollin = 1, |
bcda7baa | 1022 | .buffer_select = 1, |
fddaface | 1023 | }, |
0463b6c5 | 1024 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1025 | }, |
3e4827b0 JA |
1026 | [IORING_OP_EPOLL_CTL] = { |
1027 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1028 | }, |
7d67af2c PB |
1029 | [IORING_OP_SPLICE] = { |
1030 | .needs_file = 1, | |
1031 | .hash_reg_file = 1, | |
1032 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1033 | }, |
1034 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1035 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1036 | [IORING_OP_TEE] = { |
1037 | .needs_file = 1, | |
1038 | .hash_reg_file = 1, | |
1039 | .unbound_nonreg_file = 1, | |
1040 | }, | |
36f4fa68 JA |
1041 | [IORING_OP_SHUTDOWN] = { |
1042 | .needs_file = 1, | |
1043 | }, | |
44526bed JA |
1044 | [IORING_OP_RENAMEAT] = {}, |
1045 | [IORING_OP_UNLINKAT] = {}, | |
d3656344 JA |
1046 | }; |
1047 | ||
7a612350 | 1048 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1049 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1050 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1051 | struct task_struct *task, | |
3dd0c97a | 1052 | bool cancel_all); |
78cc687b | 1053 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
b895c9a6 | 1054 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); |
1ffc5422 | 1055 | |
d4d19c19 PB |
1056 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1057 | long res, unsigned int cflags); | |
ec9c02ad | 1058 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1059 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c7dae4ba JA |
1060 | static void io_dismantle_req(struct io_kiocb *req); |
1061 | static void io_put_task(struct task_struct *task, int nr); | |
94ae5e77 JA |
1062 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
1063 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
fdecb662 | 1064 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1065 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1066 | unsigned nr_args); |
68fb8979 | 1067 | static void io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1068 | static struct file *io_file_get(struct io_submit_state *state, |
1069 | struct io_kiocb *req, int fd, bool fixed); | |
c5eef2b9 | 1070 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1071 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1072 | |
907d1df3 | 1073 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1074 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
5082620f | 1075 | static bool io_poll_remove_waitqs(struct io_kiocb *req); |
179ae0d1 | 1076 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1077 | |
9011bf9a PB |
1078 | static void io_fallback_req_func(struct work_struct *unused); |
1079 | ||
2b188cc1 JA |
1080 | static struct kmem_cache *req_cachep; |
1081 | ||
0918682b | 1082 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1083 | |
1084 | struct sock *io_uring_get_socket(struct file *file) | |
1085 | { | |
1086 | #if defined(CONFIG_UNIX) | |
1087 | if (file->f_op == &io_uring_fops) { | |
1088 | struct io_ring_ctx *ctx = file->private_data; | |
1089 | ||
1090 | return ctx->ring_sock->sk; | |
1091 | } | |
1092 | #endif | |
1093 | return NULL; | |
1094 | } | |
1095 | EXPORT_SYMBOL(io_uring_get_socket); | |
1096 | ||
f2f87370 PB |
1097 | #define io_for_each_link(pos, head) \ |
1098 | for (pos = (head); pos; pos = pos->link) | |
1099 | ||
b895c9a6 | 1100 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1101 | { |
1102 | struct io_ring_ctx *ctx = req->ctx; | |
1103 | ||
269bbe5f | 1104 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1105 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1106 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1107 | } |
1108 | } | |
1109 | ||
f70865db PB |
1110 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1111 | { | |
1112 | bool got = percpu_ref_tryget(ref); | |
1113 | ||
1114 | /* already at zero, wait for ->release() */ | |
1115 | if (!got) | |
1116 | wait_for_completion(compl); | |
1117 | percpu_ref_resurrect(ref); | |
1118 | if (got) | |
1119 | percpu_ref_put(ref); | |
1120 | } | |
1121 | ||
3dd0c97a PB |
1122 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1123 | bool cancel_all) | |
08d23634 PB |
1124 | { |
1125 | struct io_kiocb *req; | |
1126 | ||
68207680 | 1127 | if (task && head->task != task) |
08d23634 | 1128 | return false; |
3dd0c97a | 1129 | if (cancel_all) |
08d23634 PB |
1130 | return true; |
1131 | ||
1132 | io_for_each_link(req, head) { | |
b05a1bcd | 1133 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1134 | return true; |
08d23634 PB |
1135 | } |
1136 | return false; | |
1137 | } | |
1138 | ||
93d2bcd2 | 1139 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1140 | { |
93d2bcd2 | 1141 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1142 | } |
4a38aed2 | 1143 | |
2b188cc1 JA |
1144 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1145 | { | |
1146 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1147 | ||
0f158b4c | 1148 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1149 | } |
1150 | ||
8eb7e2d0 PB |
1151 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1152 | { | |
1153 | return !req->timeout.off; | |
1154 | } | |
1155 | ||
2b188cc1 JA |
1156 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1157 | { | |
1158 | struct io_ring_ctx *ctx; | |
78076bb6 | 1159 | int hash_bits; |
2b188cc1 JA |
1160 | |
1161 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1162 | if (!ctx) | |
1163 | return NULL; | |
1164 | ||
78076bb6 JA |
1165 | /* |
1166 | * Use 5 bits less than the max cq entries, that should give us around | |
1167 | * 32 entries per hash list if totally full and uniformly spread. | |
1168 | */ | |
1169 | hash_bits = ilog2(p->cq_entries); | |
1170 | hash_bits -= 5; | |
1171 | if (hash_bits <= 0) | |
1172 | hash_bits = 1; | |
1173 | ctx->cancel_hash_bits = hash_bits; | |
1174 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1175 | GFP_KERNEL); | |
1176 | if (!ctx->cancel_hash) | |
1177 | goto err; | |
1178 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1179 | ||
6224843d PB |
1180 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1181 | if (!ctx->dummy_ubuf) | |
1182 | goto err; | |
1183 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1184 | ctx->dummy_ubuf->ubuf = -1UL; | |
1185 | ||
21482896 | 1186 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1187 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1188 | goto err; | |
2b188cc1 JA |
1189 | |
1190 | ctx->flags = p->flags; | |
90554200 | 1191 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1192 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1193 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1194 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1195 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1196 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1197 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1198 | mutex_init(&ctx->uring_lock); |
311997b3 | 1199 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1200 | spin_lock_init(&ctx->completion_lock); |
540e32a0 | 1201 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1202 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1203 | INIT_LIST_HEAD(&ctx->timeout_list); |
d67d2263 BM |
1204 | spin_lock_init(&ctx->rsrc_ref_lock); |
1205 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1206 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1207 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1208 | INIT_LIST_HEAD(&ctx->tctx_list); |
1b4c351f | 1209 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
d0acdee2 | 1210 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1211 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1212 | return ctx; |
206aefde | 1213 | err: |
6224843d | 1214 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1215 | kfree(ctx->cancel_hash); |
206aefde JA |
1216 | kfree(ctx); |
1217 | return NULL; | |
2b188cc1 JA |
1218 | } |
1219 | ||
8f6ed49a PB |
1220 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1221 | { | |
1222 | struct io_rings *r = ctx->rings; | |
1223 | ||
1224 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1225 | ctx->cq_extra--; | |
1226 | } | |
1227 | ||
9cf7c104 | 1228 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1229 | { |
2bc9930e JA |
1230 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1231 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1232 | |
8f6ed49a | 1233 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1234 | } |
de0617e4 | 1235 | |
9d858b21 | 1236 | return false; |
de0617e4 JA |
1237 | } |
1238 | ||
ce3d5aae PB |
1239 | static void io_req_track_inflight(struct io_kiocb *req) |
1240 | { | |
ce3d5aae | 1241 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1242 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1243 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1244 | } |
1245 | } | |
1246 | ||
1e6fa521 JA |
1247 | static void io_prep_async_work(struct io_kiocb *req) |
1248 | { | |
1249 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1250 | struct io_ring_ctx *ctx = req->ctx; |
1251 | ||
b8e64b53 PB |
1252 | if (!(req->flags & REQ_F_CREDS)) { |
1253 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1254 | req->creds = get_current_cred(); |
b8e64b53 | 1255 | } |
003e8dcc | 1256 | |
e1d675df PB |
1257 | req->work.list.next = NULL; |
1258 | req->work.flags = 0; | |
feaadc4f PB |
1259 | if (req->flags & REQ_F_FORCE_ASYNC) |
1260 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1261 | ||
1e6fa521 JA |
1262 | if (req->flags & REQ_F_ISREG) { |
1263 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1264 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1265 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1266 | if (def->unbound_nonreg_file) |
1267 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1268 | } | |
e1d675df PB |
1269 | |
1270 | switch (req->opcode) { | |
1271 | case IORING_OP_SPLICE: | |
1272 | case IORING_OP_TEE: | |
e1d675df PB |
1273 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1274 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1275 | break; | |
1276 | } | |
561fb04a | 1277 | } |
cccf0ee8 | 1278 | |
cbdcb435 | 1279 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1280 | { |
cbdcb435 | 1281 | struct io_kiocb *cur; |
54a91f3b | 1282 | |
44eff40a PB |
1283 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1284 | struct io_ring_ctx *ctx = req->ctx; | |
1285 | ||
1286 | spin_lock_irq(&ctx->completion_lock); | |
1287 | io_for_each_link(cur, req) | |
1288 | io_prep_async_work(cur); | |
1289 | spin_unlock_irq(&ctx->completion_lock); | |
1290 | } else { | |
1291 | io_for_each_link(cur, req) | |
1292 | io_prep_async_work(cur); | |
1293 | } | |
561fb04a JA |
1294 | } |
1295 | ||
ebf93667 | 1296 | static void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1297 | { |
a197f664 | 1298 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1299 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1300 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1301 | |
3bfe6106 JA |
1302 | BUG_ON(!tctx); |
1303 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1304 | |
cbdcb435 PB |
1305 | /* init ->work of the whole link before punting */ |
1306 | io_prep_async_link(req); | |
991468dc JA |
1307 | |
1308 | /* | |
1309 | * Not expected to happen, but if we do have a bug where this _can_ | |
1310 | * happen, catch it here and ensure the request is marked as | |
1311 | * canceled. That will make io-wq go through the usual work cancel | |
1312 | * procedure rather than attempt to run this request (or create a new | |
1313 | * worker for it). | |
1314 | */ | |
1315 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1316 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1317 | ||
d07f1e8a PB |
1318 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1319 | &req->work, req->flags); | |
ebf93667 | 1320 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1321 | if (link) |
1322 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1323 | } |
1324 | ||
1ee4160c | 1325 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1326 | __must_hold(&req->ctx->completion_lock) |
5262f567 | 1327 | { |
e8c2bc1f | 1328 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1329 | |
fd9c7bc5 | 1330 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
01cec8c1 PB |
1331 | atomic_set(&req->ctx->cq_timeouts, |
1332 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1333 | list_del_init(&req->timeout.list); |
d4d19c19 | 1334 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
216578e5 | 1335 | io_put_req_deferred(req, 1); |
5262f567 JA |
1336 | } |
1337 | } | |
1338 | ||
441b8a78 | 1339 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1340 | { |
441b8a78 | 1341 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1342 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1343 | struct io_defer_entry, list); | |
de0617e4 | 1344 | |
9cf7c104 | 1345 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1346 | break; |
27dc8338 | 1347 | list_del_init(&de->list); |
907d1df3 | 1348 | io_req_task_queue(de->req); |
27dc8338 | 1349 | kfree(de); |
441b8a78 | 1350 | } |
04518945 PB |
1351 | } |
1352 | ||
360428f8 | 1353 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1354 | { |
441b8a78 | 1355 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1356 | |
f18ee4cf | 1357 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1358 | u32 events_needed, events_got; |
360428f8 | 1359 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1360 | struct io_kiocb, timeout.list); |
de0617e4 | 1361 | |
8eb7e2d0 | 1362 | if (io_is_timeout_noseq(req)) |
360428f8 | 1363 | break; |
f010505b MDG |
1364 | |
1365 | /* | |
1366 | * Since seq can easily wrap around over time, subtract | |
1367 | * the last seq at which timeouts were flushed before comparing. | |
1368 | * Assuming not more than 2^31-1 events have happened since, | |
1369 | * these subtractions won't have wrapped, so we can check if | |
1370 | * target is in [last_seq, current_seq] by comparing the two. | |
1371 | */ | |
1372 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1373 | events_got = seq - ctx->cq_last_tm_flush; | |
1374 | if (events_got < events_needed) | |
360428f8 | 1375 | break; |
bfe68a22 | 1376 | |
135fcde8 | 1377 | list_del_init(&req->timeout.list); |
1ee4160c | 1378 | io_kill_timeout(req, 0); |
f18ee4cf | 1379 | } |
f010505b | 1380 | ctx->cq_last_tm_flush = seq; |
360428f8 | 1381 | } |
5262f567 | 1382 | |
2335f6f5 | 1383 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1384 | { |
2335f6f5 PB |
1385 | if (ctx->off_timeout_used) |
1386 | io_flush_timeouts(ctx); | |
1387 | if (ctx->drain_active) | |
1388 | io_queue_deferred(ctx); | |
1389 | } | |
1390 | ||
1391 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1392 | { | |
1393 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1394 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1395 | /* order cqe stores with ring update */ |
1396 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1397 | } |
1398 | ||
90554200 JA |
1399 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1400 | { | |
1401 | struct io_rings *r = ctx->rings; | |
1402 | ||
a566c556 | 1403 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1404 | } |
1405 | ||
888aae2e PB |
1406 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1407 | { | |
1408 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1409 | } | |
1410 | ||
d068b506 | 1411 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1412 | { |
75b28aff | 1413 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1414 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1415 | |
115e12e5 SB |
1416 | /* |
1417 | * writes to the cq entry need to come after reading head; the | |
1418 | * control dependency is enough as we're using WRITE_ONCE to | |
1419 | * fill the cq entry | |
1420 | */ | |
a566c556 | 1421 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1422 | return NULL; |
1423 | ||
888aae2e | 1424 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1425 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1426 | } |
1427 | ||
f2842ab5 JA |
1428 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1429 | { | |
44c769de | 1430 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1431 | return false; |
7e55a19c SG |
1432 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1433 | return false; | |
44c769de | 1434 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1435 | } |
1436 | ||
b41e9852 | 1437 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1438 | { |
b1445e59 PB |
1439 | /* see waitqueue_active() comment */ |
1440 | smp_mb(); | |
1441 | ||
311997b3 PB |
1442 | if (waitqueue_active(&ctx->cq_wait)) |
1443 | wake_up(&ctx->cq_wait); | |
534ca6d6 JA |
1444 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1445 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1446 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1447 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1448 | if (waitqueue_active(&ctx->poll_wait)) { |
1449 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1450 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1451 | } | |
1d7bb1d5 JA |
1452 | } |
1453 | ||
80c18e4a PB |
1454 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1455 | { | |
b1445e59 PB |
1456 | /* see waitqueue_active() comment */ |
1457 | smp_mb(); | |
1458 | ||
80c18e4a | 1459 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
311997b3 PB |
1460 | if (waitqueue_active(&ctx->cq_wait)) |
1461 | wake_up(&ctx->cq_wait); | |
80c18e4a PB |
1462 | } |
1463 | if (io_should_trigger_evfd(ctx)) | |
1464 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1465 | if (waitqueue_active(&ctx->poll_wait)) { |
1466 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1467 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1468 | } | |
80c18e4a PB |
1469 | } |
1470 | ||
c4a2ed72 | 1471 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1472 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1473 | { |
1d7bb1d5 | 1474 | unsigned long flags; |
b18032bb | 1475 | bool all_flushed, posted; |
1d7bb1d5 | 1476 | |
a566c556 | 1477 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1478 | return false; |
1d7bb1d5 | 1479 | |
b18032bb | 1480 | posted = false; |
1d7bb1d5 | 1481 | spin_lock_irqsave(&ctx->completion_lock, flags); |
6c2450ae | 1482 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1483 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1484 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1485 | |
1d7bb1d5 JA |
1486 | if (!cqe && !force) |
1487 | break; | |
6c2450ae PB |
1488 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1489 | struct io_overflow_cqe, list); | |
1490 | if (cqe) | |
1491 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1492 | else | |
8f6ed49a PB |
1493 | io_account_cq_overflow(ctx); |
1494 | ||
b18032bb | 1495 | posted = true; |
6c2450ae PB |
1496 | list_del(&ocqe->list); |
1497 | kfree(ocqe); | |
1d7bb1d5 JA |
1498 | } |
1499 | ||
09e88404 PB |
1500 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1501 | if (all_flushed) { | |
5ed7a37d | 1502 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1503 | WRITE_ONCE(ctx->rings->sq_flags, |
1504 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1505 | } |
46930143 | 1506 | |
b18032bb JA |
1507 | if (posted) |
1508 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1509 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1510 | if (posted) |
1511 | io_cqring_ev_posted(ctx); | |
09e88404 | 1512 | return all_flushed; |
1d7bb1d5 JA |
1513 | } |
1514 | ||
6c2450ae | 1515 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
6c503150 | 1516 | { |
ca0a2651 JA |
1517 | bool ret = true; |
1518 | ||
5ed7a37d | 1519 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1520 | /* iopoll syncs against uring_lock, not completion_lock */ |
1521 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1522 | mutex_lock(&ctx->uring_lock); | |
6c2450ae | 1523 | ret = __io_cqring_overflow_flush(ctx, force); |
6c503150 PB |
1524 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1525 | mutex_unlock(&ctx->uring_lock); | |
1526 | } | |
ca0a2651 JA |
1527 | |
1528 | return ret; | |
6c503150 PB |
1529 | } |
1530 | ||
abc54d63 JA |
1531 | /* |
1532 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1533 | * see commit f958d7b528b1 for details. | |
1534 | */ | |
1535 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1536 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1537 | ||
de9b4cca JA |
1538 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) |
1539 | { | |
abc54d63 | 1540 | return atomic_inc_not_zero(&req->refs); |
de9b4cca JA |
1541 | } |
1542 | ||
1543 | static inline bool req_ref_sub_and_test(struct io_kiocb *req, int refs) | |
1544 | { | |
abc54d63 JA |
1545 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1546 | return atomic_sub_and_test(refs, &req->refs); | |
de9b4cca JA |
1547 | } |
1548 | ||
1549 | static inline bool req_ref_put_and_test(struct io_kiocb *req) | |
1550 | { | |
abc54d63 JA |
1551 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1552 | return atomic_dec_and_test(&req->refs); | |
de9b4cca JA |
1553 | } |
1554 | ||
1555 | static inline void req_ref_put(struct io_kiocb *req) | |
1556 | { | |
abc54d63 | 1557 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
de9b4cca JA |
1558 | } |
1559 | ||
1560 | static inline void req_ref_get(struct io_kiocb *req) | |
1561 | { | |
abc54d63 JA |
1562 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1563 | atomic_inc(&req->refs); | |
de9b4cca JA |
1564 | } |
1565 | ||
d4d19c19 PB |
1566 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1567 | long res, unsigned int cflags) | |
2b188cc1 | 1568 | { |
cce4b8b0 | 1569 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1570 | |
cce4b8b0 PB |
1571 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1572 | if (!ocqe) { | |
1573 | /* | |
1574 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1575 | * or cannot allocate an overflow entry, then we need to drop it | |
1576 | * on the floor. | |
1577 | */ | |
8f6ed49a | 1578 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1579 | return false; |
2b188cc1 | 1580 | } |
cce4b8b0 | 1581 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1582 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1583 | WRITE_ONCE(ctx->rings->sq_flags, |
1584 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1585 | ||
cce4b8b0 | 1586 | } |
d4d19c19 | 1587 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1588 | ocqe->cqe.res = res; |
1589 | ocqe->cqe.flags = cflags; | |
1590 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1591 | return true; | |
2b188cc1 JA |
1592 | } |
1593 | ||
d4d19c19 PB |
1594 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1595 | long res, unsigned int cflags) | |
2b188cc1 JA |
1596 | { |
1597 | struct io_uring_cqe *cqe; | |
1598 | ||
d4d19c19 | 1599 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1600 | |
2b188cc1 JA |
1601 | /* |
1602 | * If we can't get a cq entry, userspace overflowed the | |
1603 | * submission (by quite a lot). Increment the overflow count in | |
1604 | * the ring. | |
1605 | */ | |
d068b506 | 1606 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1607 | if (likely(cqe)) { |
d4d19c19 | 1608 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1609 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1610 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1611 | return true; |
2b188cc1 | 1612 | } |
d4d19c19 | 1613 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1614 | } |
1615 | ||
8d13326e | 1616 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1617 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1618 | long res, unsigned int cflags) | |
bcda7baa | 1619 | { |
d4d19c19 | 1620 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1621 | } |
1622 | ||
7a612350 PB |
1623 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1624 | unsigned int cflags) | |
2b188cc1 | 1625 | { |
78e19bbe | 1626 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1627 | unsigned long flags; |
1628 | ||
1629 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
d4d19c19 | 1630 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1631 | /* |
1632 | * If we're the last reference to this request, add to our locked | |
1633 | * free_list cache. | |
1634 | */ | |
de9b4cca | 1635 | if (req_ref_put_and_test(req)) { |
7a612350 | 1636 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
93d2bcd2 | 1637 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) |
7a612350 PB |
1638 | io_disarm_next(req); |
1639 | if (req->link) { | |
1640 | io_req_task_queue(req->link); | |
1641 | req->link = NULL; | |
1642 | } | |
1643 | } | |
c7dae4ba JA |
1644 | io_dismantle_req(req); |
1645 | io_put_task(req->task, 1); | |
d0acdee2 PB |
1646 | list_add(&req->compl.list, &ctx->locked_free_list); |
1647 | ctx->locked_free_nr++; | |
180f829f PB |
1648 | } else { |
1649 | if (!percpu_ref_tryget(&ctx->refs)) | |
1650 | req = NULL; | |
1651 | } | |
7a612350 | 1652 | io_commit_cqring(ctx); |
2b188cc1 | 1653 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
7a612350 | 1654 | |
180f829f PB |
1655 | if (req) { |
1656 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1657 | percpu_ref_put(&ctx->refs); |
180f829f | 1658 | } |
229a7b63 JA |
1659 | } |
1660 | ||
4e3d9ff9 JA |
1661 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1662 | { | |
c854357b | 1663 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1664 | } |
1665 | ||
a38d68db | 1666 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1667 | unsigned int cflags) |
229a7b63 | 1668 | { |
4e3d9ff9 | 1669 | if (io_req_needs_clean(req)) |
68fb8979 | 1670 | io_clean_op(req); |
a38d68db PB |
1671 | req->result = res; |
1672 | req->compl.cflags = cflags; | |
e342c807 | 1673 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1674 | } |
1675 | ||
889fca73 PB |
1676 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1677 | long res, unsigned cflags) | |
bcda7baa | 1678 | { |
889fca73 PB |
1679 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1680 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1681 | else |
c7dae4ba | 1682 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1683 | } |
1684 | ||
a38d68db | 1685 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1686 | { |
889fca73 | 1687 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1688 | } |
1689 | ||
f41db273 PB |
1690 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1691 | { | |
93d2bcd2 | 1692 | req_set_fail(req); |
f41db273 PB |
1693 | io_put_req(req); |
1694 | io_req_complete_post(req, res, 0); | |
1695 | } | |
1696 | ||
dac7a098 PB |
1697 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
1698 | struct io_comp_state *cs) | |
1699 | { | |
1700 | spin_lock_irq(&ctx->completion_lock); | |
d0acdee2 PB |
1701 | list_splice_init(&ctx->locked_free_list, &cs->free_list); |
1702 | ctx->locked_free_nr = 0; | |
dac7a098 PB |
1703 | spin_unlock_irq(&ctx->completion_lock); |
1704 | } | |
1705 | ||
dd78f492 | 1706 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1707 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1708 | { |
c7dae4ba JA |
1709 | struct io_submit_state *state = &ctx->submit_state; |
1710 | struct io_comp_state *cs = &state->comp; | |
dd78f492 | 1711 | int nr; |
0ddf92e8 | 1712 | |
c7dae4ba JA |
1713 | /* |
1714 | * If we have more than a batch's worth of requests in our IRQ side | |
1715 | * locked cache, grab the lock and move them over to our submission | |
1716 | * side cache. | |
1717 | */ | |
d0acdee2 | 1718 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
dac7a098 | 1719 | io_flush_cached_locked_reqs(ctx, cs); |
0ddf92e8 | 1720 | |
dd78f492 | 1721 | nr = state->free_reqs; |
c7dae4ba | 1722 | while (!list_empty(&cs->free_list)) { |
dd78f492 PB |
1723 | struct io_kiocb *req = list_first_entry(&cs->free_list, |
1724 | struct io_kiocb, compl.list); | |
1725 | ||
1b4c351f | 1726 | list_del(&req->compl.list); |
dd78f492 PB |
1727 | state->reqs[nr++] = req; |
1728 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1729 | break; |
1b4c351f JA |
1730 | } |
1731 | ||
dd78f492 PB |
1732 | state->free_reqs = nr; |
1733 | return nr != 0; | |
0ddf92e8 JA |
1734 | } |
1735 | ||
e5d1bc0a | 1736 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
2b188cc1 | 1737 | { |
e5d1bc0a PB |
1738 | struct io_submit_state *state = &ctx->submit_state; |
1739 | ||
fe7e3257 | 1740 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1741 | |
f6b6c7d6 | 1742 | if (!state->free_reqs) { |
291b2821 | 1743 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
99ebe4ef | 1744 | int ret, i; |
2579f913 | 1745 | |
c7dae4ba | 1746 | if (io_flush_cached_reqs(ctx)) |
e5d1bc0a PB |
1747 | goto got_req; |
1748 | ||
bf019da7 PB |
1749 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1750 | state->reqs); | |
fd6fab2c JA |
1751 | |
1752 | /* | |
1753 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1754 | * retry single alloc to be on the safe side. | |
1755 | */ | |
1756 | if (unlikely(ret <= 0)) { | |
1757 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1758 | if (!state->reqs[0]) | |
3893f39f | 1759 | return NULL; |
fd6fab2c JA |
1760 | ret = 1; |
1761 | } | |
99ebe4ef PB |
1762 | |
1763 | /* | |
1764 | * Don't initialise the fields below on every allocation, but | |
1765 | * do that in advance and keep valid on free. | |
1766 | */ | |
1767 | for (i = 0; i < ret; i++) { | |
1768 | struct io_kiocb *req = state->reqs[i]; | |
1769 | ||
1770 | req->ctx = ctx; | |
1771 | req->link = NULL; | |
1772 | req->async_data = NULL; | |
1773 | /* not necessary, but safer to zero */ | |
1774 | req->result = 0; | |
1775 | } | |
291b2821 | 1776 | state->free_reqs = ret; |
2b188cc1 | 1777 | } |
e5d1bc0a | 1778 | got_req: |
291b2821 PB |
1779 | state->free_reqs--; |
1780 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1781 | } |
1782 | ||
e1d767f0 | 1783 | static inline void io_put_file(struct file *file) |
8da11c19 | 1784 | { |
e1d767f0 | 1785 | if (file) |
8da11c19 PB |
1786 | fput(file); |
1787 | } | |
1788 | ||
4edf20f9 | 1789 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1790 | { |
094bae49 | 1791 | unsigned int flags = req->flags; |
929a3af9 | 1792 | |
3a0a6902 PB |
1793 | if (io_req_needs_clean(req)) |
1794 | io_clean_op(req); | |
e1d767f0 PB |
1795 | if (!(flags & REQ_F_FIXED_FILE)) |
1796 | io_put_file(req->file); | |
269bbe5f BM |
1797 | if (req->fixed_rsrc_refs) |
1798 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1799 | if (req->async_data) { |
094bae49 | 1800 | kfree(req->async_data); |
99ebe4ef PB |
1801 | req->async_data = NULL; |
1802 | } | |
e65ef56d JA |
1803 | } |
1804 | ||
b23fcf47 | 1805 | /* must to be called somewhat shortly after putting a request */ |
7c660731 PB |
1806 | static inline void io_put_task(struct task_struct *task, int nr) |
1807 | { | |
1808 | struct io_uring_task *tctx = task->io_uring; | |
1809 | ||
1810 | percpu_counter_sub(&tctx->inflight, nr); | |
1811 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1812 | wake_up(&tctx->wait); | |
1813 | put_task_struct_many(task, nr); | |
1814 | } | |
1815 | ||
216578e5 | 1816 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1817 | { |
51a4cc11 | 1818 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1819 | |
216578e5 | 1820 | io_dismantle_req(req); |
7c660731 | 1821 | io_put_task(req->task, 1); |
c6ca97b3 | 1822 | |
3893f39f | 1823 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 1824 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1825 | } |
1826 | ||
f2f87370 PB |
1827 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1828 | { | |
1829 | struct io_kiocb *nxt = req->link; | |
1830 | ||
1831 | req->link = nxt->link; | |
1832 | nxt->link = NULL; | |
1833 | } | |
1834 | ||
33cc89a9 PB |
1835 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
1836 | __must_hold(&req->ctx->completion_lock) | |
2665abfd | 1837 | { |
33cc89a9 | 1838 | struct io_kiocb *link = req->link; |
f2f87370 | 1839 | |
900fad45 PB |
1840 | /* |
1841 | * Can happen if a linked timeout fired and link had been like | |
1842 | * req -> link t-out -> link t-out [-> ...] | |
1843 | */ | |
c9abd7ad PB |
1844 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1845 | struct io_timeout_data *io = link->async_data; | |
7c86ffee | 1846 | |
f2f87370 | 1847 | io_remove_next_linked(req); |
90cd7e42 | 1848 | link->timeout.head = NULL; |
fd9c7bc5 | 1849 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
d4d19c19 PB |
1850 | io_cqring_fill_event(link->ctx, link->user_data, |
1851 | -ECANCELED, 0); | |
33cc89a9 | 1852 | io_put_req_deferred(link, 1); |
d4729fbd | 1853 | return true; |
c9abd7ad PB |
1854 | } |
1855 | } | |
d4729fbd | 1856 | return false; |
7c86ffee PB |
1857 | } |
1858 | ||
d148ca4b | 1859 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 1860 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 1861 | { |
33cc89a9 | 1862 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 1863 | |
f2f87370 | 1864 | req->link = NULL; |
f2f87370 PB |
1865 | while (link) { |
1866 | nxt = link->link; | |
1867 | link->link = NULL; | |
2665abfd | 1868 | |
f2f87370 | 1869 | trace_io_uring_fail_link(req, link); |
d4d19c19 | 1870 | io_cqring_fill_event(link->ctx, link->user_data, -ECANCELED, 0); |
1575f21a | 1871 | io_put_req_deferred(link, 2); |
f2f87370 | 1872 | link = nxt; |
9e645e11 | 1873 | } |
33cc89a9 | 1874 | } |
9e645e11 | 1875 | |
33cc89a9 PB |
1876 | static bool io_disarm_next(struct io_kiocb *req) |
1877 | __must_hold(&req->ctx->completion_lock) | |
1878 | { | |
1879 | bool posted = false; | |
1880 | ||
1881 | if (likely(req->flags & REQ_F_LINK_TIMEOUT)) | |
1882 | posted = io_kill_linked_timeout(req); | |
93d2bcd2 | 1883 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 1884 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
1885 | posted |= (req->link != NULL); |
1886 | io_fail_links(req); | |
1887 | } | |
1888 | return posted; | |
9e645e11 JA |
1889 | } |
1890 | ||
3fa5e0f3 | 1891 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1892 | { |
33cc89a9 | 1893 | struct io_kiocb *nxt; |
944e58bf | 1894 | |
9e645e11 JA |
1895 | /* |
1896 | * If LINK is set, we have dependent requests in this chain. If we | |
1897 | * didn't fail this request, queue the first one up, moving any other | |
1898 | * dependencies to the next request. In case of failure, fail the rest | |
1899 | * of the chain. | |
1900 | */ | |
93d2bcd2 | 1901 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) { |
33cc89a9 PB |
1902 | struct io_ring_ctx *ctx = req->ctx; |
1903 | unsigned long flags; | |
1904 | bool posted; | |
1905 | ||
1906 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1907 | posted = io_disarm_next(req); | |
1908 | if (posted) | |
1909 | io_commit_cqring(req->ctx); | |
1910 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1911 | if (posted) | |
1912 | io_cqring_ev_posted(ctx); | |
f2f87370 | 1913 | } |
33cc89a9 PB |
1914 | nxt = req->link; |
1915 | req->link = NULL; | |
1916 | return nxt; | |
4d7dd462 | 1917 | } |
9e645e11 | 1918 | |
f2f87370 | 1919 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 1920 | { |
cdbff982 | 1921 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
1922 | return NULL; |
1923 | return __io_req_find_next(req); | |
1924 | } | |
1925 | ||
2c32395d PB |
1926 | static void ctx_flush_and_put(struct io_ring_ctx *ctx) |
1927 | { | |
1928 | if (!ctx) | |
1929 | return; | |
1930 | if (ctx->submit_state.comp.nr) { | |
1931 | mutex_lock(&ctx->uring_lock); | |
2a2758f2 | 1932 | io_submit_flush_completions(ctx); |
2c32395d PB |
1933 | mutex_unlock(&ctx->uring_lock); |
1934 | } | |
1935 | percpu_ref_put(&ctx->refs); | |
1936 | } | |
1937 | ||
7cbf1722 | 1938 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 1939 | { |
ebd0df2e | 1940 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
1941 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
1942 | task_work); | |
c40f6379 | 1943 | |
16f72070 | 1944 | while (1) { |
3f18407d PB |
1945 | struct io_wq_work_node *node; |
1946 | ||
1947 | spin_lock_irq(&tctx->task_lock); | |
c6538be9 | 1948 | node = tctx->task_list.first; |
3f18407d PB |
1949 | INIT_WQ_LIST(&tctx->task_list); |
1950 | spin_unlock_irq(&tctx->task_lock); | |
1951 | ||
3f18407d PB |
1952 | while (node) { |
1953 | struct io_wq_work_node *next = node->next; | |
1954 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
1955 | io_task_work.node); | |
1956 | ||
1957 | if (req->ctx != ctx) { | |
1958 | ctx_flush_and_put(ctx); | |
1959 | ctx = req->ctx; | |
1960 | percpu_ref_get(&ctx->refs); | |
1961 | } | |
5b0a6acc | 1962 | req->io_task_work.func(req); |
3f18407d PB |
1963 | node = next; |
1964 | } | |
7a778f9d | 1965 | if (wq_list_empty(&tctx->task_list)) { |
110aa25c | 1966 | spin_lock_irq(&tctx->task_lock); |
7a778f9d | 1967 | clear_bit(0, &tctx->task_state); |
110aa25c JA |
1968 | if (wq_list_empty(&tctx->task_list)) { |
1969 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d | 1970 | break; |
110aa25c JA |
1971 | } |
1972 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d PB |
1973 | /* another tctx_task_work() is enqueued, yield */ |
1974 | if (test_and_set_bit(0, &tctx->task_state)) | |
1975 | break; | |
1976 | } | |
7cbf1722 | 1977 | cond_resched(); |
3f18407d | 1978 | } |
ebd0df2e PB |
1979 | |
1980 | ctx_flush_and_put(ctx); | |
7cbf1722 JA |
1981 | } |
1982 | ||
e09ee510 | 1983 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 1984 | { |
c15b79de | 1985 | struct task_struct *tsk = req->task; |
7cbf1722 | 1986 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 1987 | enum task_work_notify_mode notify; |
e09ee510 | 1988 | struct io_wq_work_node *node; |
0b81e80c | 1989 | unsigned long flags; |
7cbf1722 JA |
1990 | |
1991 | WARN_ON_ONCE(!tctx); | |
1992 | ||
0b81e80c | 1993 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 1994 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
0b81e80c | 1995 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
1996 | |
1997 | /* task_work already pending, we're done */ | |
1998 | if (test_bit(0, &tctx->task_state) || | |
1999 | test_and_set_bit(0, &tctx->task_state)) | |
e09ee510 PB |
2000 | return; |
2001 | if (unlikely(tsk->flags & PF_EXITING)) | |
2002 | goto fail; | |
7cbf1722 | 2003 | |
c15b79de PB |
2004 | /* |
2005 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2006 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2007 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2008 | * will do the job. | |
2009 | */ | |
2010 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2011 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2012 | wake_up_process(tsk); | |
e09ee510 | 2013 | return; |
c15b79de | 2014 | } |
e09ee510 PB |
2015 | fail: |
2016 | clear_bit(0, &tctx->task_state); | |
0b81e80c | 2017 | spin_lock_irqsave(&tctx->task_lock, flags); |
e09ee510 PB |
2018 | node = tctx->task_list.first; |
2019 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2020 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2021 | |
e09ee510 PB |
2022 | while (node) { |
2023 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2024 | node = node->next; | |
2025 | if (llist_add(&req->io_task_work.fallback_node, | |
2026 | &req->ctx->fallback_llist)) | |
2027 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2028 | } | |
eab30c4d PB |
2029 | } |
2030 | ||
5b0a6acc | 2031 | static void io_req_task_cancel(struct io_kiocb *req) |
c40f6379 | 2032 | { |
87ceb6a6 | 2033 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2034 | |
e83acd7d | 2035 | /* ctx is guaranteed to stay alive while we hold uring_lock */ |
792bb6eb | 2036 | mutex_lock(&ctx->uring_lock); |
2593553a | 2037 | io_req_complete_failed(req, req->result); |
792bb6eb | 2038 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2039 | } |
2040 | ||
5b0a6acc | 2041 | static void io_req_task_submit(struct io_kiocb *req) |
c40f6379 JA |
2042 | { |
2043 | struct io_ring_ctx *ctx = req->ctx; | |
2044 | ||
04fc6c80 | 2045 | /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ |
81b6d05c | 2046 | mutex_lock(&ctx->uring_lock); |
9c688260 | 2047 | if (!(req->task->flags & PF_EXITING) && !req->task->in_execve) |
c5eef2b9 | 2048 | __io_queue_sqe(req); |
81b6d05c | 2049 | else |
2593553a | 2050 | io_req_complete_failed(req, -EFAULT); |
81b6d05c | 2051 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2052 | } |
2053 | ||
2c4b8eb6 | 2054 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2055 | { |
2c4b8eb6 | 2056 | req->result = ret; |
5b0a6acc | 2057 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2058 | io_req_task_work_add(req); |
c40f6379 JA |
2059 | } |
2060 | ||
2c4b8eb6 | 2061 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2062 | { |
5b0a6acc | 2063 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2064 | io_req_task_work_add(req); |
a3df7698 PB |
2065 | } |
2066 | ||
773af691 JA |
2067 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2068 | { | |
2069 | req->io_task_work.func = io_queue_async_work; | |
2070 | io_req_task_work_add(req); | |
2071 | } | |
2072 | ||
f2f87370 | 2073 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2074 | { |
9b5f7bd9 | 2075 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2076 | |
2077 | if (nxt) | |
906a8c3f | 2078 | io_req_task_queue(nxt); |
c69f8dbe JL |
2079 | } |
2080 | ||
c3524383 | 2081 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2082 | { |
c3524383 PB |
2083 | io_queue_next(req); |
2084 | __io_free_req(req); | |
2085 | } | |
8766dd51 | 2086 | |
2d6500d4 | 2087 | struct req_batch { |
5af1d13e PB |
2088 | struct task_struct *task; |
2089 | int task_refs; | |
1b4c351f | 2090 | int ctx_refs; |
2d6500d4 PB |
2091 | }; |
2092 | ||
5af1d13e PB |
2093 | static inline void io_init_req_batch(struct req_batch *rb) |
2094 | { | |
5af1d13e | 2095 | rb->task_refs = 0; |
9ae72463 | 2096 | rb->ctx_refs = 0; |
5af1d13e PB |
2097 | rb->task = NULL; |
2098 | } | |
2099 | ||
2d6500d4 PB |
2100 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2101 | struct req_batch *rb) | |
2102 | { | |
6e833d53 | 2103 | if (rb->task) |
7c660731 | 2104 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2105 | if (rb->ctx_refs) |
2106 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2107 | } |
2108 | ||
6ff119a6 PB |
2109 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2110 | struct io_submit_state *state) | |
2d6500d4 | 2111 | { |
f2f87370 | 2112 | io_queue_next(req); |
96670657 | 2113 | io_dismantle_req(req); |
2d6500d4 | 2114 | |
e3bc8e9d | 2115 | if (req->task != rb->task) { |
7c660731 PB |
2116 | if (rb->task) |
2117 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2118 | rb->task = req->task; |
2119 | rb->task_refs = 0; | |
5af1d13e | 2120 | } |
e3bc8e9d | 2121 | rb->task_refs++; |
9ae72463 | 2122 | rb->ctx_refs++; |
5af1d13e | 2123 | |
bd759045 | 2124 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2125 | state->reqs[state->free_reqs++] = req; |
bd759045 PB |
2126 | else |
2127 | list_add(&req->compl.list, &state->comp.free_list); | |
7a743e22 PB |
2128 | } |
2129 | ||
2a2758f2 | 2130 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
905c172f | 2131 | { |
2a2758f2 | 2132 | struct io_comp_state *cs = &ctx->submit_state.comp; |
905c172f | 2133 | int i, nr = cs->nr; |
905c172f PB |
2134 | struct req_batch rb; |
2135 | ||
905c172f PB |
2136 | spin_lock_irq(&ctx->completion_lock); |
2137 | for (i = 0; i < nr; i++) { | |
5182ed2e PB |
2138 | struct io_kiocb *req = cs->reqs[i]; |
2139 | ||
d4d19c19 PB |
2140 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2141 | req->compl.cflags); | |
905c172f PB |
2142 | } |
2143 | io_commit_cqring(ctx); | |
2144 | spin_unlock_irq(&ctx->completion_lock); | |
905c172f | 2145 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2146 | |
2147 | io_init_req_batch(&rb); | |
905c172f | 2148 | for (i = 0; i < nr; i++) { |
5182ed2e | 2149 | struct io_kiocb *req = cs->reqs[i]; |
905c172f PB |
2150 | |
2151 | /* submission and completion refs */ | |
de9b4cca | 2152 | if (req_ref_sub_and_test(req, 2)) |
6ff119a6 | 2153 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2154 | } |
2155 | ||
2156 | io_req_free_batch_finish(ctx, &rb); | |
2157 | cs->nr = 0; | |
7a743e22 PB |
2158 | } |
2159 | ||
ba816ad6 JA |
2160 | /* |
2161 | * Drop reference to request, return next in chain (if there is one) if this | |
2162 | * was the last reference to this request. | |
2163 | */ | |
0d85035a | 2164 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2165 | { |
9b5f7bd9 PB |
2166 | struct io_kiocb *nxt = NULL; |
2167 | ||
de9b4cca | 2168 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2169 | nxt = io_req_find_next(req); |
4d7dd462 | 2170 | __io_free_req(req); |
2a44f467 | 2171 | } |
9b5f7bd9 | 2172 | return nxt; |
2b188cc1 JA |
2173 | } |
2174 | ||
0d85035a | 2175 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2176 | { |
de9b4cca | 2177 | if (req_ref_put_and_test(req)) |
e65ef56d | 2178 | io_free_req(req); |
2b188cc1 JA |
2179 | } |
2180 | ||
216578e5 PB |
2181 | static void io_free_req_deferred(struct io_kiocb *req) |
2182 | { | |
5b0a6acc | 2183 | req->io_task_work.func = io_free_req; |
e09ee510 | 2184 | io_req_task_work_add(req); |
216578e5 PB |
2185 | } |
2186 | ||
2187 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2188 | { | |
de9b4cca | 2189 | if (req_ref_sub_and_test(req, refs)) |
216578e5 PB |
2190 | io_free_req_deferred(req); |
2191 | } | |
2192 | ||
6c503150 | 2193 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2194 | { |
2195 | /* See comment at the top of this file */ | |
2196 | smp_rmb(); | |
e23de15f | 2197 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2198 | } |
2199 | ||
fb5ccc98 PB |
2200 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2201 | { | |
2202 | struct io_rings *rings = ctx->rings; | |
2203 | ||
2204 | /* make sure SQ entry isn't read before tail */ | |
2205 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2206 | } | |
2207 | ||
8ff069bf | 2208 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2209 | { |
8ff069bf | 2210 | unsigned int cflags; |
e94f141b | 2211 | |
bcda7baa JA |
2212 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2213 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2214 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2215 | kfree(kbuf); |
2216 | return cflags; | |
e94f141b JA |
2217 | } |
2218 | ||
8ff069bf | 2219 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2220 | { |
4d954c25 | 2221 | struct io_buffer *kbuf; |
bcda7baa | 2222 | |
4d954c25 | 2223 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2224 | return io_put_kbuf(req, kbuf); |
2225 | } | |
2226 | ||
4c6e277c JA |
2227 | static inline bool io_run_task_work(void) |
2228 | { | |
ef98eb04 | 2229 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2230 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2231 | tracehook_notify_signal(); |
4c6e277c JA |
2232 | return true; |
2233 | } | |
2234 | ||
2235 | return false; | |
bcda7baa JA |
2236 | } |
2237 | ||
def596e9 JA |
2238 | /* |
2239 | * Find and free completed poll iocbs | |
2240 | */ | |
2241 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
3c30ef0f | 2242 | struct list_head *done, bool resubmit) |
def596e9 | 2243 | { |
8237e045 | 2244 | struct req_batch rb; |
def596e9 | 2245 | struct io_kiocb *req; |
bbde017a XW |
2246 | |
2247 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2248 | smp_rmb(); | |
def596e9 | 2249 | |
5af1d13e | 2250 | io_init_req_batch(&rb); |
def596e9 | 2251 | while (!list_empty(done)) { |
bcda7baa JA |
2252 | int cflags = 0; |
2253 | ||
d21ffe7e | 2254 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2255 | list_del(&req->inflight_entry); |
2256 | ||
3c30ef0f | 2257 | if (READ_ONCE(req->result) == -EAGAIN && resubmit && |
8c130827 | 2258 | !(req->flags & REQ_F_DONT_REISSUE)) { |
bbde017a | 2259 | req->iopoll_completed = 0; |
8c130827 | 2260 | req_ref_get(req); |
773af691 | 2261 | io_req_task_queue_reissue(req); |
8c130827 | 2262 | continue; |
bbde017a | 2263 | } |
def596e9 | 2264 | |
bcda7baa | 2265 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2266 | cflags = io_put_rw_kbuf(req); |
bcda7baa | 2267 | |
d4d19c19 | 2268 | __io_cqring_fill_event(ctx, req->user_data, req->result, cflags); |
def596e9 JA |
2269 | (*nr_events)++; |
2270 | ||
de9b4cca | 2271 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2272 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2273 | } |
def596e9 | 2274 | |
09bb8394 | 2275 | io_commit_cqring(ctx); |
80c18e4a | 2276 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2277 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2278 | } |
2279 | ||
def596e9 | 2280 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
3c30ef0f | 2281 | long min, bool resubmit) |
def596e9 JA |
2282 | { |
2283 | struct io_kiocb *req, *tmp; | |
2284 | LIST_HEAD(done); | |
2285 | bool spin; | |
2286 | int ret; | |
2287 | ||
2288 | /* | |
2289 | * Only spin for completions if we don't have multiple devices hanging | |
2290 | * off our complete list, and we're under the requested amount. | |
2291 | */ | |
915b3dde | 2292 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 JA |
2293 | |
2294 | ret = 0; | |
d21ffe7e | 2295 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2296 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2297 | |
2298 | /* | |
581f9810 BM |
2299 | * Move completed and retryable entries to our local lists. |
2300 | * If we find a request that requires polling, break out | |
2301 | * and complete those lists first, if we have entries there. | |
def596e9 | 2302 | */ |
65a6543d | 2303 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2304 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2305 | continue; |
2306 | } | |
2307 | if (!list_empty(&done)) | |
2308 | break; | |
2309 | ||
2310 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2311 | if (ret < 0) | |
2312 | break; | |
2313 | ||
3aadc23e PB |
2314 | /* iopoll may have completed current req */ |
2315 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2316 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2317 | |
def596e9 JA |
2318 | if (ret && spin) |
2319 | spin = false; | |
2320 | ret = 0; | |
2321 | } | |
2322 | ||
2323 | if (!list_empty(&done)) | |
3c30ef0f | 2324 | io_iopoll_complete(ctx, nr_events, &done, resubmit); |
def596e9 JA |
2325 | |
2326 | return ret; | |
2327 | } | |
2328 | ||
def596e9 JA |
2329 | /* |
2330 | * We can't just wait for polled events to come to us, we have to actively | |
2331 | * find and complete them. | |
2332 | */ | |
b2edc0a7 | 2333 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2334 | { |
2335 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2336 | return; | |
2337 | ||
2338 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2339 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2340 | unsigned int nr_events = 0; |
2341 | ||
3c30ef0f | 2342 | io_do_iopoll(ctx, &nr_events, 0, false); |
08f5439f | 2343 | |
b2edc0a7 PB |
2344 | /* let it sleep and repeat later if can't complete a request */ |
2345 | if (nr_events == 0) | |
2346 | break; | |
08f5439f JA |
2347 | /* |
2348 | * Ensure we allow local-to-the-cpu processing to take place, | |
2349 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2350 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2351 | */ |
3fcee5a6 PB |
2352 | if (need_resched()) { |
2353 | mutex_unlock(&ctx->uring_lock); | |
2354 | cond_resched(); | |
2355 | mutex_lock(&ctx->uring_lock); | |
2356 | } | |
def596e9 JA |
2357 | } |
2358 | mutex_unlock(&ctx->uring_lock); | |
2359 | } | |
2360 | ||
7668b92a | 2361 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2362 | { |
7668b92a | 2363 | unsigned int nr_events = 0; |
e9979b36 | 2364 | int ret = 0; |
500f9fba | 2365 | |
c7849be9 XW |
2366 | /* |
2367 | * We disallow the app entering submit/complete with polling, but we | |
2368 | * still need to lock the ring to prevent racing with polled issue | |
2369 | * that got punted to a workqueue. | |
2370 | */ | |
2371 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2372 | /* |
2373 | * Don't enter poll loop if we already have events pending. | |
2374 | * If we do, we can potentially be spinning for commands that | |
2375 | * already triggered a CQE (eg in error). | |
2376 | */ | |
5ed7a37d | 2377 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2378 | __io_cqring_overflow_flush(ctx, false); |
2379 | if (io_cqring_events(ctx)) | |
2380 | goto out; | |
def596e9 | 2381 | do { |
500f9fba JA |
2382 | /* |
2383 | * If a submit got punted to a workqueue, we can have the | |
2384 | * application entering polling for a command before it gets | |
2385 | * issued. That app will hold the uring_lock for the duration | |
2386 | * of the poll right here, so we need to take a breather every | |
2387 | * now and then to ensure that the issue has a chance to add | |
2388 | * the poll to the issued list. Otherwise we can spin here | |
2389 | * forever, while the workqueue is stuck trying to acquire the | |
2390 | * very same mutex. | |
2391 | */ | |
e9979b36 | 2392 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2393 | u32 tail = ctx->cached_cq_tail; |
2394 | ||
500f9fba | 2395 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2396 | io_run_task_work(); |
500f9fba | 2397 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2398 | |
8f487ef2 PB |
2399 | /* some requests don't go through iopoll_list */ |
2400 | if (tail != ctx->cached_cq_tail || | |
2401 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2402 | break; |
500f9fba | 2403 | } |
3c30ef0f | 2404 | ret = io_do_iopoll(ctx, &nr_events, min, true); |
f39c8a5b PB |
2405 | } while (!ret && nr_events < min && !need_resched()); |
2406 | out: | |
500f9fba | 2407 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2408 | return ret; |
2409 | } | |
2410 | ||
491381ce | 2411 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2412 | { |
491381ce JA |
2413 | /* |
2414 | * Tell lockdep we inherited freeze protection from submission | |
2415 | * thread. | |
2416 | */ | |
2417 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2418 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2419 | |
1c98679d PB |
2420 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2421 | sb_end_write(sb); | |
2b188cc1 JA |
2422 | } |
2423 | } | |
2424 | ||
b63534c4 | 2425 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2426 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2427 | { |
ab454438 | 2428 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2429 | |
ab454438 PB |
2430 | if (!rw) |
2431 | return !io_req_prep_async(req); | |
2432 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2433 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2434 | return true; | |
b63534c4 | 2435 | } |
b63534c4 | 2436 | |
3e6a0d3c | 2437 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2438 | { |
355afaeb | 2439 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2440 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2441 | |
355afaeb JA |
2442 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2443 | return false; | |
3e6a0d3c JA |
2444 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2445 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2446 | return false; |
7c977a58 JA |
2447 | /* |
2448 | * If ref is dying, we might be running poll reap from the exit work. | |
2449 | * Don't attempt to reissue from that path, just let it fail with | |
2450 | * -EAGAIN. | |
2451 | */ | |
3e6a0d3c JA |
2452 | if (percpu_ref_is_dying(&ctx->refs)) |
2453 | return false; | |
ef046888 JA |
2454 | /* |
2455 | * Play it safe and assume not safe to re-import and reissue if we're | |
2456 | * not in the original thread group (or in task context). | |
2457 | */ | |
2458 | if (!same_thread_group(req->task, current) || !in_task()) | |
2459 | return false; | |
3e6a0d3c JA |
2460 | return true; |
2461 | } | |
e82ad485 | 2462 | #else |
a1ff1e3f | 2463 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2464 | { |
2465 | return false; | |
2466 | } | |
e82ad485 | 2467 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2468 | { |
b63534c4 JA |
2469 | return false; |
2470 | } | |
3e6a0d3c | 2471 | #endif |
b63534c4 | 2472 | |
9011bf9a PB |
2473 | static void io_fallback_req_func(struct work_struct *work) |
2474 | { | |
2475 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
2476 | fallback_work.work); | |
2477 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
2478 | struct io_kiocb *req, *tmp; | |
2479 | ||
9cb0073b | 2480 | percpu_ref_get(&ctx->refs); |
5b0a6acc PB |
2481 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) |
2482 | req->io_task_work.func(req); | |
9cb0073b | 2483 | percpu_ref_put(&ctx->refs); |
9011bf9a PB |
2484 | } |
2485 | ||
a1d7c393 | 2486 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2487 | unsigned int issue_flags) |
a1d7c393 | 2488 | { |
2f8e45f1 PB |
2489 | int cflags = 0; |
2490 | ||
b65c128f PB |
2491 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2492 | kiocb_end_write(req); | |
9532b99b PB |
2493 | if (res != req->result) { |
2494 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2495 | io_rw_should_reissue(req)) { | |
2496 | req->flags |= REQ_F_REISSUE; | |
2497 | return; | |
2498 | } | |
93d2bcd2 | 2499 | req_set_fail(req); |
9532b99b | 2500 | } |
2f8e45f1 PB |
2501 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2502 | cflags = io_put_rw_kbuf(req); | |
2503 | __io_req_complete(req, issue_flags, res, cflags); | |
ba816ad6 JA |
2504 | } |
2505 | ||
2506 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2507 | { | |
9adbd45d | 2508 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2509 | |
889fca73 | 2510 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2511 | } |
2512 | ||
def596e9 JA |
2513 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2514 | { | |
9adbd45d | 2515 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2516 | |
491381ce JA |
2517 | if (kiocb->ki_flags & IOCB_WRITE) |
2518 | kiocb_end_write(req); | |
9532b99b | 2519 | if (unlikely(res != req->result)) { |
a1ff1e3f JA |
2520 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
2521 | io_resubmit_prep(req))) { | |
93d2bcd2 | 2522 | req_set_fail(req); |
9532b99b PB |
2523 | req->flags |= REQ_F_DONT_REISSUE; |
2524 | } | |
8c130827 | 2525 | } |
bbde017a XW |
2526 | |
2527 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2528 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2529 | smp_wmb(); |
2530 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2531 | } |
2532 | ||
2533 | /* | |
2534 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2535 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2536 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2537 | * accessing the kiocb cookie. |
2538 | */ | |
cb3d8972 | 2539 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2540 | { |
2541 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2542 | const bool in_async = io_wq_current_is_worker(); |
2543 | ||
2544 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2545 | if (unlikely(in_async)) | |
2546 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2547 | |
2548 | /* | |
2549 | * Track whether we have multiple files in our lists. This will impact | |
2550 | * how we do polling eventually, not spinning if we're on potentially | |
2551 | * different devices. | |
2552 | */ | |
540e32a0 | 2553 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2554 | ctx->poll_multi_queue = false; |
2555 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2556 | struct io_kiocb *list_req; |
915b3dde | 2557 | unsigned int queue_num0, queue_num1; |
def596e9 | 2558 | |
540e32a0 | 2559 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2560 | inflight_entry); |
915b3dde HX |
2561 | |
2562 | if (list_req->file != req->file) { | |
2563 | ctx->poll_multi_queue = true; | |
2564 | } else { | |
2565 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2566 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2567 | if (queue_num0 != queue_num1) | |
2568 | ctx->poll_multi_queue = true; | |
2569 | } | |
def596e9 JA |
2570 | } |
2571 | ||
2572 | /* | |
2573 | * For fast devices, IO may have already completed. If it has, add | |
2574 | * it to the front so we find it first. | |
2575 | */ | |
65a6543d | 2576 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2577 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2578 | else |
d21ffe7e | 2579 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2580 | |
cb3d8972 PB |
2581 | if (unlikely(in_async)) { |
2582 | /* | |
2583 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2584 | * in sq thread task context or in io worker task context. If | |
2585 | * current task context is sq thread, we don't need to check | |
2586 | * whether should wake up sq thread. | |
2587 | */ | |
2588 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2589 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2590 | wake_up(&ctx->sq_data->wait); | |
2591 | ||
2592 | mutex_unlock(&ctx->uring_lock); | |
2593 | } | |
def596e9 JA |
2594 | } |
2595 | ||
9f13c35b PB |
2596 | static inline void io_state_file_put(struct io_submit_state *state) |
2597 | { | |
02b23a9a PB |
2598 | if (state->file_refs) { |
2599 | fput_many(state->file, state->file_refs); | |
2600 | state->file_refs = 0; | |
2601 | } | |
9a56a232 JA |
2602 | } |
2603 | ||
2604 | /* | |
2605 | * Get as many references to a file as we have IOs left in this submission, | |
2606 | * assuming most submissions are for one file, or at least that each file | |
2607 | * has more than one submission. | |
2608 | */ | |
8da11c19 | 2609 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2610 | { |
2611 | if (!state) | |
2612 | return fget(fd); | |
2613 | ||
6e1271e6 | 2614 | if (state->file_refs) { |
9a56a232 | 2615 | if (state->fd == fd) { |
6e1271e6 | 2616 | state->file_refs--; |
9a56a232 JA |
2617 | return state->file; |
2618 | } | |
02b23a9a | 2619 | io_state_file_put(state); |
9a56a232 JA |
2620 | } |
2621 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2622 | if (unlikely(!state->file)) |
9a56a232 JA |
2623 | return NULL; |
2624 | ||
2625 | state->fd = fd; | |
6e1271e6 | 2626 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2627 | return state->file; |
2628 | } | |
2629 | ||
4503b767 JA |
2630 | static bool io_bdev_nowait(struct block_device *bdev) |
2631 | { | |
9ba0d0c8 | 2632 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2633 | } |
2634 | ||
2b188cc1 JA |
2635 | /* |
2636 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2637 | * any file. For now, just ensure that anything potentially problematic is done | |
2638 | * inline. | |
2639 | */ | |
7b29f92d | 2640 | static bool __io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2641 | { |
2642 | umode_t mode = file_inode(file)->i_mode; | |
2643 | ||
4503b767 | 2644 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2645 | if (IS_ENABLED(CONFIG_BLOCK) && |
2646 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2647 | return true; |
2648 | return false; | |
2649 | } | |
976517f1 | 2650 | if (S_ISSOCK(mode)) |
2b188cc1 | 2651 | return true; |
4503b767 | 2652 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2653 | if (IS_ENABLED(CONFIG_BLOCK) && |
2654 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2655 | file->f_op != &io_uring_fops) |
2656 | return true; | |
2657 | return false; | |
2658 | } | |
2b188cc1 | 2659 | |
c5b85625 JA |
2660 | /* any ->read/write should understand O_NONBLOCK */ |
2661 | if (file->f_flags & O_NONBLOCK) | |
2662 | return true; | |
2663 | ||
af197f50 JA |
2664 | if (!(file->f_mode & FMODE_NOWAIT)) |
2665 | return false; | |
2666 | ||
2667 | if (rw == READ) | |
2668 | return file->f_op->read_iter != NULL; | |
2669 | ||
2670 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2671 | } |
2672 | ||
7b29f92d JA |
2673 | static bool io_file_supports_async(struct io_kiocb *req, int rw) |
2674 | { | |
2675 | if (rw == READ && (req->flags & REQ_F_ASYNC_READ)) | |
2676 | return true; | |
2677 | else if (rw == WRITE && (req->flags & REQ_F_ASYNC_WRITE)) | |
2678 | return true; | |
2679 | ||
2680 | return __io_file_supports_async(req->file, rw); | |
2681 | } | |
2682 | ||
a88fc400 | 2683 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2684 | { |
def596e9 | 2685 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2686 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2687 | struct file *file = req->file; |
09bb8394 JA |
2688 | unsigned ioprio; |
2689 | int ret; | |
2b188cc1 | 2690 | |
7b29f92d | 2691 | if (!(req->flags & REQ_F_ISREG) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2692 | req->flags |= REQ_F_ISREG; |
2693 | ||
2b188cc1 | 2694 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2695 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2696 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2697 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2698 | } |
2b188cc1 | 2699 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2700 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2701 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2702 | if (unlikely(ret)) | |
2703 | return ret; | |
2b188cc1 | 2704 | |
75c668cd PB |
2705 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2706 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2707 | req->flags |= REQ_F_NOWAIT; | |
2708 | ||
2b188cc1 JA |
2709 | ioprio = READ_ONCE(sqe->ioprio); |
2710 | if (ioprio) { | |
2711 | ret = ioprio_check_cap(ioprio); | |
2712 | if (ret) | |
09bb8394 | 2713 | return ret; |
2b188cc1 JA |
2714 | |
2715 | kiocb->ki_ioprio = ioprio; | |
2716 | } else | |
2717 | kiocb->ki_ioprio = get_current_ioprio(); | |
2718 | ||
def596e9 | 2719 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2720 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2721 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2722 | return -EOPNOTSUPP; |
2b188cc1 | 2723 | |
def596e9 JA |
2724 | kiocb->ki_flags |= IOCB_HIPRI; |
2725 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2726 | req->iopoll_completed = 0; |
def596e9 | 2727 | } else { |
09bb8394 JA |
2728 | if (kiocb->ki_flags & IOCB_HIPRI) |
2729 | return -EINVAL; | |
def596e9 JA |
2730 | kiocb->ki_complete = io_complete_rw; |
2731 | } | |
9adbd45d | 2732 | |
eae071c9 PB |
2733 | if (req->opcode == IORING_OP_READ_FIXED || |
2734 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2735 | req->imu = NULL; | |
2736 | io_req_set_rsrc_node(req); | |
2737 | } | |
2738 | ||
3529d8c2 JA |
2739 | req->rw.addr = READ_ONCE(sqe->addr); |
2740 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2741 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2742 | return 0; |
2b188cc1 JA |
2743 | } |
2744 | ||
2745 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2746 | { | |
2747 | switch (ret) { | |
2748 | case -EIOCBQUEUED: | |
2749 | break; | |
2750 | case -ERESTARTSYS: | |
2751 | case -ERESTARTNOINTR: | |
2752 | case -ERESTARTNOHAND: | |
2753 | case -ERESTART_RESTARTBLOCK: | |
2754 | /* | |
2755 | * We can't just restart the syscall, since previously | |
2756 | * submitted sqes may already be in progress. Just fail this | |
2757 | * IO with EINTR. | |
2758 | */ | |
2759 | ret = -EINTR; | |
df561f66 | 2760 | fallthrough; |
2b188cc1 JA |
2761 | default: |
2762 | kiocb->ki_complete(kiocb, ret, 0); | |
2763 | } | |
2764 | } | |
2765 | ||
a1d7c393 | 2766 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2767 | unsigned int issue_flags) |
ba816ad6 | 2768 | { |
ba04291e | 2769 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2770 | struct io_async_rw *io = req->async_data; |
97284637 | 2771 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2772 | |
227c0c96 | 2773 | /* add previously done IO, if any */ |
e8c2bc1f | 2774 | if (io && io->bytes_done > 0) { |
227c0c96 | 2775 | if (ret < 0) |
e8c2bc1f | 2776 | ret = io->bytes_done; |
227c0c96 | 2777 | else |
e8c2bc1f | 2778 | ret += io->bytes_done; |
227c0c96 JA |
2779 | } |
2780 | ||
ba04291e JA |
2781 | if (req->flags & REQ_F_CUR_POS) |
2782 | req->file->f_pos = kiocb->ki_pos; | |
e149bd74 | 2783 | if (ret >= 0 && check_reissue) |
889fca73 | 2784 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2785 | else |
2786 | io_rw_done(kiocb, ret); | |
97284637 | 2787 | |
fe7e3257 | 2788 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
97284637 | 2789 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2790 | if (io_resubmit_prep(req)) { |
8c130827 | 2791 | req_ref_get(req); |
773af691 | 2792 | io_req_task_queue_reissue(req); |
8c130827 | 2793 | } else { |
97284637 PB |
2794 | int cflags = 0; |
2795 | ||
93d2bcd2 | 2796 | req_set_fail(req); |
97284637 PB |
2797 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2798 | cflags = io_put_rw_kbuf(req); | |
2799 | __io_req_complete(req, issue_flags, ret, cflags); | |
2800 | } | |
2801 | } | |
ba816ad6 JA |
2802 | } |
2803 | ||
eae071c9 PB |
2804 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2805 | struct io_mapped_ubuf *imu) | |
edafccee | 2806 | { |
9adbd45d | 2807 | size_t len = req->rw.len; |
75769e3f | 2808 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2809 | size_t offset; |
edafccee | 2810 | |
75769e3f | 2811 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2812 | return -EFAULT; |
2813 | /* not inside the mapped region */ | |
4751f53d | 2814 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2815 | return -EFAULT; |
2816 | ||
2817 | /* | |
2818 | * May not be a start of buffer, set size appropriately | |
2819 | * and advance us to the beginning. | |
2820 | */ | |
2821 | offset = buf_addr - imu->ubuf; | |
2822 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2823 | |
2824 | if (offset) { | |
2825 | /* | |
2826 | * Don't use iov_iter_advance() here, as it's really slow for | |
2827 | * using the latter parts of a big fixed buffer - it iterates | |
2828 | * over each segment manually. We can cheat a bit here, because | |
2829 | * we know that: | |
2830 | * | |
2831 | * 1) it's a BVEC iter, we set it up | |
2832 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2833 | * first and last bvec | |
2834 | * | |
2835 | * So just find our index, and adjust the iterator afterwards. | |
2836 | * If the offset is within the first bvec (or the whole first | |
2837 | * bvec, just use iov_iter_advance(). This makes it easier | |
2838 | * since we can just skip the first segment, which may not | |
2839 | * be PAGE_SIZE aligned. | |
2840 | */ | |
2841 | const struct bio_vec *bvec = imu->bvec; | |
2842 | ||
2843 | if (offset <= bvec->bv_len) { | |
2844 | iov_iter_advance(iter, offset); | |
2845 | } else { | |
2846 | unsigned long seg_skip; | |
2847 | ||
2848 | /* skip first vec */ | |
2849 | offset -= bvec->bv_len; | |
2850 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2851 | ||
2852 | iter->bvec = bvec + seg_skip; | |
2853 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2854 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2855 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2856 | } |
2857 | } | |
2858 | ||
847595de | 2859 | return 0; |
edafccee JA |
2860 | } |
2861 | ||
eae071c9 PB |
2862 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
2863 | { | |
2864 | struct io_ring_ctx *ctx = req->ctx; | |
2865 | struct io_mapped_ubuf *imu = req->imu; | |
2866 | u16 index, buf_index = req->buf_index; | |
2867 | ||
2868 | if (likely(!imu)) { | |
2869 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
2870 | return -EFAULT; | |
2871 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2872 | imu = READ_ONCE(ctx->user_bufs[index]); | |
2873 | req->imu = imu; | |
2874 | } | |
2875 | return __io_import_fixed(req, rw, iter, imu); | |
2876 | } | |
2877 | ||
bcda7baa JA |
2878 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2879 | { | |
2880 | if (needs_lock) | |
2881 | mutex_unlock(&ctx->uring_lock); | |
2882 | } | |
2883 | ||
2884 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2885 | { | |
2886 | /* | |
2887 | * "Normal" inline submissions always hold the uring_lock, since we | |
2888 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2889 | * The only exception is when we've detached the request and issue it | |
2890 | * from an async worker thread, grab the lock for that case. | |
2891 | */ | |
2892 | if (needs_lock) | |
2893 | mutex_lock(&ctx->uring_lock); | |
2894 | } | |
2895 | ||
2896 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2897 | int bgid, struct io_buffer *kbuf, | |
2898 | bool needs_lock) | |
2899 | { | |
2900 | struct io_buffer *head; | |
2901 | ||
2902 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2903 | return kbuf; | |
2904 | ||
2905 | io_ring_submit_lock(req->ctx, needs_lock); | |
2906 | ||
2907 | lockdep_assert_held(&req->ctx->uring_lock); | |
2908 | ||
9e15c3a0 | 2909 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2910 | if (head) { |
2911 | if (!list_empty(&head->list)) { | |
2912 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2913 | list); | |
2914 | list_del(&kbuf->list); | |
2915 | } else { | |
2916 | kbuf = head; | |
9e15c3a0 | 2917 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2918 | } |
2919 | if (*len > kbuf->len) | |
2920 | *len = kbuf->len; | |
2921 | } else { | |
2922 | kbuf = ERR_PTR(-ENOBUFS); | |
2923 | } | |
2924 | ||
2925 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2926 | ||
2927 | return kbuf; | |
2928 | } | |
2929 | ||
4d954c25 JA |
2930 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2931 | bool needs_lock) | |
2932 | { | |
2933 | struct io_buffer *kbuf; | |
4f4eeba8 | 2934 | u16 bgid; |
4d954c25 JA |
2935 | |
2936 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2937 | bgid = req->buf_index; |
4d954c25 JA |
2938 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2939 | if (IS_ERR(kbuf)) | |
2940 | return kbuf; | |
2941 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2942 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2943 | return u64_to_user_ptr(kbuf->addr); | |
2944 | } | |
2945 | ||
2946 | #ifdef CONFIG_COMPAT | |
2947 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2948 | bool needs_lock) | |
2949 | { | |
2950 | struct compat_iovec __user *uiov; | |
2951 | compat_ssize_t clen; | |
2952 | void __user *buf; | |
2953 | ssize_t len; | |
2954 | ||
2955 | uiov = u64_to_user_ptr(req->rw.addr); | |
2956 | if (!access_ok(uiov, sizeof(*uiov))) | |
2957 | return -EFAULT; | |
2958 | if (__get_user(clen, &uiov->iov_len)) | |
2959 | return -EFAULT; | |
2960 | if (clen < 0) | |
2961 | return -EINVAL; | |
2962 | ||
2963 | len = clen; | |
2964 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2965 | if (IS_ERR(buf)) | |
2966 | return PTR_ERR(buf); | |
2967 | iov[0].iov_base = buf; | |
2968 | iov[0].iov_len = (compat_size_t) len; | |
2969 | return 0; | |
2970 | } | |
2971 | #endif | |
2972 | ||
2973 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2974 | bool needs_lock) | |
2975 | { | |
2976 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2977 | void __user *buf; | |
2978 | ssize_t len; | |
2979 | ||
2980 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2981 | return -EFAULT; | |
2982 | ||
2983 | len = iov[0].iov_len; | |
2984 | if (len < 0) | |
2985 | return -EINVAL; | |
2986 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2987 | if (IS_ERR(buf)) | |
2988 | return PTR_ERR(buf); | |
2989 | iov[0].iov_base = buf; | |
2990 | iov[0].iov_len = len; | |
2991 | return 0; | |
2992 | } | |
2993 | ||
2994 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2995 | bool needs_lock) | |
2996 | { | |
dddb3e26 JA |
2997 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2998 | struct io_buffer *kbuf; | |
2999 | ||
3000 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3001 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3002 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3003 | return 0; |
dddb3e26 | 3004 | } |
dd201662 | 3005 | if (req->rw.len != 1) |
4d954c25 JA |
3006 | return -EINVAL; |
3007 | ||
3008 | #ifdef CONFIG_COMPAT | |
3009 | if (req->ctx->compat) | |
3010 | return io_compat_import(req, iov, needs_lock); | |
3011 | #endif | |
3012 | ||
3013 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3014 | } | |
3015 | ||
847595de PB |
3016 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3017 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3018 | { |
9adbd45d JA |
3019 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3020 | size_t sqe_len = req->rw.len; | |
847595de | 3021 | u8 opcode = req->opcode; |
4d954c25 | 3022 | ssize_t ret; |
edafccee | 3023 | |
7d009165 | 3024 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3025 | *iovec = NULL; |
9adbd45d | 3026 | return io_import_fixed(req, rw, iter); |
edafccee | 3027 | } |
2b188cc1 | 3028 | |
bcda7baa | 3029 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3030 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3031 | return -EINVAL; |
3032 | ||
3a6820f2 | 3033 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3034 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3035 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3036 | if (IS_ERR(buf)) |
4d954c25 | 3037 | return PTR_ERR(buf); |
3f9d6441 | 3038 | req->rw.len = sqe_len; |
bcda7baa JA |
3039 | } |
3040 | ||
3a6820f2 JA |
3041 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3042 | *iovec = NULL; | |
10fc72e4 | 3043 | return ret; |
3a6820f2 JA |
3044 | } |
3045 | ||
4d954c25 JA |
3046 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3047 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3048 | if (!ret) |
3049 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3050 | *iovec = NULL; |
3051 | return ret; | |
3052 | } | |
3053 | ||
89cd35c5 CH |
3054 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3055 | req->ctx->compat); | |
2b188cc1 JA |
3056 | } |
3057 | ||
0fef9483 JA |
3058 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3059 | { | |
5b09e37e | 3060 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3061 | } |
3062 | ||
31b51510 | 3063 | /* |
32960613 JA |
3064 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3065 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3066 | */ |
4017eb91 | 3067 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3068 | { |
4017eb91 JA |
3069 | struct kiocb *kiocb = &req->rw.kiocb; |
3070 | struct file *file = req->file; | |
32960613 JA |
3071 | ssize_t ret = 0; |
3072 | ||
3073 | /* | |
3074 | * Don't support polled IO through this interface, and we can't | |
3075 | * support non-blocking either. For the latter, this just causes | |
3076 | * the kiocb to be handled from an async context. | |
3077 | */ | |
3078 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3079 | return -EOPNOTSUPP; | |
3080 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3081 | return -EAGAIN; | |
3082 | ||
3083 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3084 | struct iovec iovec; |
32960613 JA |
3085 | ssize_t nr; |
3086 | ||
311ae9e1 PB |
3087 | if (!iov_iter_is_bvec(iter)) { |
3088 | iovec = iov_iter_iovec(iter); | |
3089 | } else { | |
4017eb91 JA |
3090 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3091 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3092 | } |
3093 | ||
32960613 JA |
3094 | if (rw == READ) { |
3095 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3096 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3097 | } else { |
3098 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3099 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3100 | } |
3101 | ||
3102 | if (nr < 0) { | |
3103 | if (!ret) | |
3104 | ret = nr; | |
3105 | break; | |
3106 | } | |
3107 | ret += nr; | |
3108 | if (nr != iovec.iov_len) | |
3109 | break; | |
4017eb91 JA |
3110 | req->rw.len -= nr; |
3111 | req->rw.addr += nr; | |
32960613 JA |
3112 | iov_iter_advance(iter, nr); |
3113 | } | |
3114 | ||
3115 | return ret; | |
3116 | } | |
3117 | ||
ff6165b2 JA |
3118 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3119 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3120 | { |
e8c2bc1f | 3121 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3122 | |
ff6165b2 | 3123 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3124 | rw->free_iovec = iovec; |
227c0c96 | 3125 | rw->bytes_done = 0; |
ff6165b2 | 3126 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3127 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3128 | return; |
b64e3444 | 3129 | if (!iovec) { |
ff6165b2 JA |
3130 | unsigned iov_off = 0; |
3131 | ||
3132 | rw->iter.iov = rw->fast_iov; | |
3133 | if (iter->iov != fast_iov) { | |
3134 | iov_off = iter->iov - fast_iov; | |
3135 | rw->iter.iov += iov_off; | |
3136 | } | |
3137 | if (rw->fast_iov != fast_iov) | |
3138 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3139 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3140 | } else { |
3141 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3142 | } |
3143 | } | |
3144 | ||
6cb78689 | 3145 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3146 | { |
e8c2bc1f JA |
3147 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3148 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3149 | return req->async_data == NULL; | |
3d9932a8 XW |
3150 | } |
3151 | ||
ff6165b2 JA |
3152 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3153 | const struct iovec *fast_iov, | |
227c0c96 | 3154 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3155 | { |
26f0505a | 3156 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3157 | return 0; |
e8c2bc1f | 3158 | if (!req->async_data) { |
6cb78689 | 3159 | if (io_alloc_async_data(req)) { |
6bf985dc | 3160 | kfree(iovec); |
5d204bcf | 3161 | return -ENOMEM; |
6bf985dc | 3162 | } |
b7bb4f7d | 3163 | |
ff6165b2 | 3164 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3165 | } |
b7bb4f7d | 3166 | return 0; |
f67676d1 JA |
3167 | } |
3168 | ||
73debe68 | 3169 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3170 | { |
e8c2bc1f | 3171 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3172 | struct iovec *iov = iorw->fast_iov; |
847595de | 3173 | int ret; |
c3e330a4 | 3174 | |
2846c481 | 3175 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3176 | if (unlikely(ret < 0)) |
3177 | return ret; | |
3178 | ||
ab0b196c PB |
3179 | iorw->bytes_done = 0; |
3180 | iorw->free_iovec = iov; | |
3181 | if (iov) | |
3182 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3183 | return 0; |
3184 | } | |
3185 | ||
73debe68 | 3186 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3187 | { |
3529d8c2 JA |
3188 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3189 | return -EBADF; | |
93642ef8 | 3190 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3191 | } |
3192 | ||
c1dd91d1 JA |
3193 | /* |
3194 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3195 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3196 | * This gets called when the page is unlocked, and we generally expect that to | |
3197 | * happen when the page IO is completed and the page is now uptodate. This will | |
3198 | * queue a task_work based retry of the operation, attempting to copy the data | |
3199 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3200 | * do a thread based blocking retry of the operation. That's the unexpected | |
3201 | * slow path. | |
3202 | */ | |
bcf5a063 JA |
3203 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3204 | int sync, void *arg) | |
3205 | { | |
3206 | struct wait_page_queue *wpq; | |
3207 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3208 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3209 | |
3210 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3211 | ||
cdc8fcb4 LT |
3212 | if (!wake_page_match(wpq, key)) |
3213 | return 0; | |
3214 | ||
c8d317aa | 3215 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3216 | list_del_init(&wait->entry); |
3217 | ||
bcf5a063 | 3218 | /* submit ref gets dropped, acquire a new one */ |
de9b4cca | 3219 | req_ref_get(req); |
921b9054 | 3220 | io_req_task_queue(req); |
bcf5a063 JA |
3221 | return 1; |
3222 | } | |
3223 | ||
c1dd91d1 JA |
3224 | /* |
3225 | * This controls whether a given IO request should be armed for async page | |
3226 | * based retry. If we return false here, the request is handed to the async | |
3227 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3228 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3229 | * will either succeed because the page is now uptodate and unlocked, or it | |
3230 | * will register a callback when the page is unlocked at IO completion. Through | |
3231 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3232 | * That retry will attempt the buffered read again. The retry will generally | |
3233 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3234 | * async worker threads for a blocking retry. | |
3235 | */ | |
227c0c96 | 3236 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3237 | { |
e8c2bc1f JA |
3238 | struct io_async_rw *rw = req->async_data; |
3239 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3240 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3241 | |
bcf5a063 JA |
3242 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3243 | if (req->flags & REQ_F_NOWAIT) | |
3244 | return false; | |
f67676d1 | 3245 | |
227c0c96 | 3246 | /* Only for buffered IO */ |
3b2a4439 | 3247 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3248 | return false; |
3b2a4439 | 3249 | |
bcf5a063 JA |
3250 | /* |
3251 | * just use poll if we can, and don't attempt if the fs doesn't | |
3252 | * support callback based unlocks | |
3253 | */ | |
3254 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3255 | return false; | |
f67676d1 | 3256 | |
3b2a4439 JA |
3257 | wait->wait.func = io_async_buf_func; |
3258 | wait->wait.private = req; | |
3259 | wait->wait.flags = 0; | |
3260 | INIT_LIST_HEAD(&wait->wait.entry); | |
3261 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3262 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3263 | kiocb->ki_waitq = wait; |
3b2a4439 | 3264 | return true; |
bcf5a063 JA |
3265 | } |
3266 | ||
aeab9506 | 3267 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3268 | { |
3269 | if (req->file->f_op->read_iter) | |
3270 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3271 | else if (req->file->f_op->read) |
4017eb91 | 3272 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3273 | else |
3274 | return -EINVAL; | |
f67676d1 JA |
3275 | } |
3276 | ||
889fca73 | 3277 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3278 | { |
3279 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3280 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3281 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3282 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3283 | ssize_t io_size, ret, ret2; |
45d189c6 | 3284 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3285 | |
2846c481 | 3286 | if (rw) { |
e8c2bc1f | 3287 | iter = &rw->iter; |
2846c481 PB |
3288 | iovec = NULL; |
3289 | } else { | |
3290 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3291 | if (ret < 0) | |
3292 | return ret; | |
3293 | } | |
632546c4 | 3294 | io_size = iov_iter_count(iter); |
fa15bafb | 3295 | req->result = io_size; |
2b188cc1 | 3296 | |
fd6c2e4c JA |
3297 | /* Ensure we clear previously set non-block flag */ |
3298 | if (!force_nonblock) | |
29de5f6a | 3299 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3300 | else |
3301 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3302 | ||
24c74678 | 3303 | /* If the file doesn't support async, just async punt */ |
7b29f92d | 3304 | if (force_nonblock && !io_file_supports_async(req, READ)) { |
6713e7a6 | 3305 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3306 | return ret ?: -EAGAIN; |
6713e7a6 | 3307 | } |
9e645e11 | 3308 | |
632546c4 | 3309 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3310 | if (unlikely(ret)) { |
3311 | kfree(iovec); | |
3312 | return ret; | |
3313 | } | |
2b188cc1 | 3314 | |
227c0c96 | 3315 | ret = io_iter_do_read(req, iter); |
32960613 | 3316 | |
230d50d4 | 3317 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3318 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3319 | /* IOPOLL retry should happen for io-wq threads */ |
3320 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3321 | goto done; |
75c668cd PB |
3322 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3323 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3324 | goto done; |
84216315 | 3325 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3326 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3327 | ret = 0; |
230d50d4 JA |
3328 | } else if (ret == -EIOCBQUEUED) { |
3329 | goto out_free; | |
7335e3bf | 3330 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3331 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3332 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3333 | goto done; |
227c0c96 JA |
3334 | } |
3335 | ||
227c0c96 | 3336 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3337 | if (ret2) |
3338 | return ret2; | |
3339 | ||
fe1cdd55 | 3340 | iovec = NULL; |
e8c2bc1f | 3341 | rw = req->async_data; |
227c0c96 | 3342 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3343 | iter = &rw->iter; |
227c0c96 | 3344 | |
b23df91b PB |
3345 | do { |
3346 | io_size -= ret; | |
3347 | rw->bytes_done += ret; | |
3348 | /* if we can retry, do so with the callbacks armed */ | |
3349 | if (!io_rw_should_retry(req)) { | |
3350 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3351 | return -EAGAIN; | |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3356 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3357 | * desired page gets unlocked. We can also get a partial read | |
3358 | * here, and if we do, then just retry at the new offset. | |
3359 | */ | |
3360 | ret = io_iter_do_read(req, iter); | |
3361 | if (ret == -EIOCBQUEUED) | |
3362 | return 0; | |
227c0c96 | 3363 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3364 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3365 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3366 | done: |
889fca73 | 3367 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3368 | out_free: |
3369 | /* it's faster to check here then delegate to kfree */ | |
3370 | if (iovec) | |
3371 | kfree(iovec); | |
5ea5dd45 | 3372 | return 0; |
2b188cc1 JA |
3373 | } |
3374 | ||
73debe68 | 3375 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3376 | { |
3529d8c2 JA |
3377 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3378 | return -EBADF; | |
93642ef8 | 3379 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3380 | } |
3381 | ||
889fca73 | 3382 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3383 | { |
3384 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3385 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3386 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3387 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3388 | ssize_t ret, ret2, io_size; |
45d189c6 | 3389 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3390 | |
2846c481 | 3391 | if (rw) { |
e8c2bc1f | 3392 | iter = &rw->iter; |
2846c481 PB |
3393 | iovec = NULL; |
3394 | } else { | |
3395 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3396 | if (ret < 0) | |
3397 | return ret; | |
3398 | } | |
632546c4 | 3399 | io_size = iov_iter_count(iter); |
fa15bafb | 3400 | req->result = io_size; |
2b188cc1 | 3401 | |
fd6c2e4c JA |
3402 | /* Ensure we clear previously set non-block flag */ |
3403 | if (!force_nonblock) | |
a88fc400 PB |
3404 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3405 | else | |
3406 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3407 | |
24c74678 | 3408 | /* If the file doesn't support async, just async punt */ |
7b29f92d | 3409 | if (force_nonblock && !io_file_supports_async(req, WRITE)) |
f67676d1 | 3410 | goto copy_iov; |
31b51510 | 3411 | |
10d59345 JA |
3412 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3413 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3414 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3415 | goto copy_iov; |
31b51510 | 3416 | |
632546c4 | 3417 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3418 | if (unlikely(ret)) |
3419 | goto out_free; | |
4ed734b0 | 3420 | |
fa15bafb PB |
3421 | /* |
3422 | * Open-code file_start_write here to grab freeze protection, | |
3423 | * which will be released by another thread in | |
3424 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3425 | * released so that it doesn't complain about the held lock when | |
3426 | * we return to userspace. | |
3427 | */ | |
3428 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3429 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3430 | __sb_writers_release(file_inode(req->file)->i_sb, |
3431 | SB_FREEZE_WRITE); | |
3432 | } | |
3433 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3434 | |
fa15bafb | 3435 | if (req->file->f_op->write_iter) |
ff6165b2 | 3436 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3437 | else if (req->file->f_op->write) |
4017eb91 | 3438 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3439 | else |
3440 | ret2 = -EINVAL; | |
4ed734b0 | 3441 | |
6ad7f233 PB |
3442 | if (req->flags & REQ_F_REISSUE) { |
3443 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3444 | ret2 = -EAGAIN; |
6ad7f233 | 3445 | } |
230d50d4 | 3446 | |
fa15bafb PB |
3447 | /* |
3448 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3449 | * retry them without IOCB_NOWAIT. | |
3450 | */ | |
3451 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3452 | ret2 = -EAGAIN; | |
75c668cd PB |
3453 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3454 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3455 | goto done; |
fa15bafb | 3456 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3457 | /* IOPOLL retry should happen for io-wq threads */ |
3458 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3459 | goto copy_iov; | |
355afaeb | 3460 | done: |
889fca73 | 3461 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3462 | } else { |
f67676d1 | 3463 | copy_iov: |
84216315 | 3464 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3465 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3466 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3467 | return ret ?: -EAGAIN; |
2b188cc1 | 3468 | } |
31b51510 | 3469 | out_free: |
f261c168 | 3470 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3471 | if (iovec) |
6f2cc166 | 3472 | kfree(iovec); |
2b188cc1 JA |
3473 | return ret; |
3474 | } | |
3475 | ||
80a261fd JA |
3476 | static int io_renameat_prep(struct io_kiocb *req, |
3477 | const struct io_uring_sqe *sqe) | |
3478 | { | |
3479 | struct io_rename *ren = &req->rename; | |
3480 | const char __user *oldf, *newf; | |
3481 | ||
ed7eb259 JA |
3482 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3483 | return -EINVAL; | |
3484 | if (sqe->ioprio || sqe->buf_index) | |
3485 | return -EINVAL; | |
80a261fd JA |
3486 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3487 | return -EBADF; | |
3488 | ||
3489 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3490 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3491 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3492 | ren->new_dfd = READ_ONCE(sqe->len); | |
3493 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3494 | ||
3495 | ren->oldpath = getname(oldf); | |
3496 | if (IS_ERR(ren->oldpath)) | |
3497 | return PTR_ERR(ren->oldpath); | |
3498 | ||
3499 | ren->newpath = getname(newf); | |
3500 | if (IS_ERR(ren->newpath)) { | |
3501 | putname(ren->oldpath); | |
3502 | return PTR_ERR(ren->newpath); | |
3503 | } | |
3504 | ||
3505 | req->flags |= REQ_F_NEED_CLEANUP; | |
3506 | return 0; | |
3507 | } | |
3508 | ||
45d189c6 | 3509 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3510 | { |
3511 | struct io_rename *ren = &req->rename; | |
3512 | int ret; | |
3513 | ||
45d189c6 | 3514 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3515 | return -EAGAIN; |
3516 | ||
3517 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3518 | ren->newpath, ren->flags); | |
3519 | ||
3520 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3521 | if (ret < 0) | |
93d2bcd2 | 3522 | req_set_fail(req); |
80a261fd JA |
3523 | io_req_complete(req, ret); |
3524 | return 0; | |
3525 | } | |
3526 | ||
14a1143b JA |
3527 | static int io_unlinkat_prep(struct io_kiocb *req, |
3528 | const struct io_uring_sqe *sqe) | |
3529 | { | |
3530 | struct io_unlink *un = &req->unlink; | |
3531 | const char __user *fname; | |
3532 | ||
22634bc5 JA |
3533 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3534 | return -EINVAL; | |
3535 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
3536 | return -EINVAL; | |
14a1143b JA |
3537 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3538 | return -EBADF; | |
3539 | ||
3540 | un->dfd = READ_ONCE(sqe->fd); | |
3541 | ||
3542 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3543 | if (un->flags & ~AT_REMOVEDIR) | |
3544 | return -EINVAL; | |
3545 | ||
3546 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3547 | un->filename = getname(fname); | |
3548 | if (IS_ERR(un->filename)) | |
3549 | return PTR_ERR(un->filename); | |
3550 | ||
3551 | req->flags |= REQ_F_NEED_CLEANUP; | |
3552 | return 0; | |
3553 | } | |
3554 | ||
45d189c6 | 3555 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3556 | { |
3557 | struct io_unlink *un = &req->unlink; | |
3558 | int ret; | |
3559 | ||
45d189c6 | 3560 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3561 | return -EAGAIN; |
3562 | ||
3563 | if (un->flags & AT_REMOVEDIR) | |
3564 | ret = do_rmdir(un->dfd, un->filename); | |
3565 | else | |
3566 | ret = do_unlinkat(un->dfd, un->filename); | |
3567 | ||
3568 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3569 | if (ret < 0) | |
93d2bcd2 | 3570 | req_set_fail(req); |
14a1143b JA |
3571 | io_req_complete(req, ret); |
3572 | return 0; | |
3573 | } | |
3574 | ||
36f4fa68 JA |
3575 | static int io_shutdown_prep(struct io_kiocb *req, |
3576 | const struct io_uring_sqe *sqe) | |
3577 | { | |
3578 | #if defined(CONFIG_NET) | |
3579 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3580 | return -EINVAL; | |
3581 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3582 | sqe->buf_index) | |
3583 | return -EINVAL; | |
3584 | ||
3585 | req->shutdown.how = READ_ONCE(sqe->len); | |
3586 | return 0; | |
3587 | #else | |
3588 | return -EOPNOTSUPP; | |
3589 | #endif | |
3590 | } | |
3591 | ||
45d189c6 | 3592 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3593 | { |
3594 | #if defined(CONFIG_NET) | |
3595 | struct socket *sock; | |
3596 | int ret; | |
3597 | ||
45d189c6 | 3598 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3599 | return -EAGAIN; |
3600 | ||
48aba79b | 3601 | sock = sock_from_file(req->file); |
36f4fa68 | 3602 | if (unlikely(!sock)) |
48aba79b | 3603 | return -ENOTSOCK; |
36f4fa68 JA |
3604 | |
3605 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3606 | if (ret < 0) |
93d2bcd2 | 3607 | req_set_fail(req); |
36f4fa68 JA |
3608 | io_req_complete(req, ret); |
3609 | return 0; | |
3610 | #else | |
3611 | return -EOPNOTSUPP; | |
3612 | #endif | |
3613 | } | |
3614 | ||
f2a8d5c7 PB |
3615 | static int __io_splice_prep(struct io_kiocb *req, |
3616 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3617 | { |
fe7e3257 | 3618 | struct io_splice *sp = &req->splice; |
7d67af2c | 3619 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3620 | |
3232dd02 PB |
3621 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3622 | return -EINVAL; | |
7d67af2c PB |
3623 | |
3624 | sp->file_in = NULL; | |
7d67af2c PB |
3625 | sp->len = READ_ONCE(sqe->len); |
3626 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3627 | ||
3628 | if (unlikely(sp->flags & ~valid_flags)) | |
3629 | return -EINVAL; | |
3630 | ||
8371adf5 PB |
3631 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3632 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3633 | if (!sp->file_in) | |
3634 | return -EBADF; | |
7d67af2c | 3635 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3636 | return 0; |
3637 | } | |
3638 | ||
f2a8d5c7 PB |
3639 | static int io_tee_prep(struct io_kiocb *req, |
3640 | const struct io_uring_sqe *sqe) | |
3641 | { | |
3642 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3643 | return -EINVAL; | |
3644 | return __io_splice_prep(req, sqe); | |
3645 | } | |
3646 | ||
45d189c6 | 3647 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3648 | { |
3649 | struct io_splice *sp = &req->splice; | |
3650 | struct file *in = sp->file_in; | |
3651 | struct file *out = sp->file_out; | |
3652 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3653 | long ret = 0; | |
3654 | ||
45d189c6 | 3655 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3656 | return -EAGAIN; |
3657 | if (sp->len) | |
3658 | ret = do_tee(in, out, sp->len, flags); | |
3659 | ||
e1d767f0 PB |
3660 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3661 | io_put_file(in); | |
f2a8d5c7 PB |
3662 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3663 | ||
f2a8d5c7 | 3664 | if (ret != sp->len) |
93d2bcd2 | 3665 | req_set_fail(req); |
e1e16097 | 3666 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3667 | return 0; |
3668 | } | |
3669 | ||
3670 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3671 | { | |
fe7e3257 | 3672 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3673 | |
3674 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3675 | sp->off_out = READ_ONCE(sqe->off); | |
3676 | return __io_splice_prep(req, sqe); | |
3677 | } | |
3678 | ||
45d189c6 | 3679 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3680 | { |
3681 | struct io_splice *sp = &req->splice; | |
3682 | struct file *in = sp->file_in; | |
3683 | struct file *out = sp->file_out; | |
3684 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3685 | loff_t *poff_in, *poff_out; | |
c9687426 | 3686 | long ret = 0; |
7d67af2c | 3687 | |
45d189c6 | 3688 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3689 | return -EAGAIN; |
7d67af2c PB |
3690 | |
3691 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3692 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3693 | |
948a7749 | 3694 | if (sp->len) |
c9687426 | 3695 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 3696 | |
e1d767f0 PB |
3697 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3698 | io_put_file(in); | |
7d67af2c PB |
3699 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3700 | ||
7d67af2c | 3701 | if (ret != sp->len) |
93d2bcd2 | 3702 | req_set_fail(req); |
e1e16097 | 3703 | io_req_complete(req, ret); |
7d67af2c PB |
3704 | return 0; |
3705 | } | |
3706 | ||
2b188cc1 JA |
3707 | /* |
3708 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3709 | */ | |
889fca73 | 3710 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3711 | { |
3712 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3713 | |
def596e9 JA |
3714 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3715 | return -EINVAL; | |
3716 | ||
889fca73 | 3717 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
3718 | return 0; |
3719 | } | |
3720 | ||
1155c76a | 3721 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3722 | { |
6b06314c | 3723 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3724 | |
09bb8394 JA |
3725 | if (!req->file) |
3726 | return -EBADF; | |
c992fe29 | 3727 | |
6b06314c | 3728 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3729 | return -EINVAL; |
edafccee | 3730 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3731 | return -EINVAL; |
3732 | ||
8ed8d3c3 JA |
3733 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3734 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3735 | return -EINVAL; | |
3736 | ||
3737 | req->sync.off = READ_ONCE(sqe->off); | |
3738 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3739 | return 0; |
3740 | } | |
3741 | ||
45d189c6 | 3742 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 3743 | { |
8ed8d3c3 | 3744 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3745 | int ret; |
3746 | ||
ac45abc0 | 3747 | /* fsync always requires a blocking context */ |
45d189c6 | 3748 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
3749 | return -EAGAIN; |
3750 | ||
9adbd45d | 3751 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3752 | end > 0 ? end : LLONG_MAX, |
3753 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3754 | if (ret < 0) | |
93d2bcd2 | 3755 | req_set_fail(req); |
e1e16097 | 3756 | io_req_complete(req, ret); |
c992fe29 CH |
3757 | return 0; |
3758 | } | |
3759 | ||
d63d1b5e JA |
3760 | static int io_fallocate_prep(struct io_kiocb *req, |
3761 | const struct io_uring_sqe *sqe) | |
3762 | { | |
3763 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3764 | return -EINVAL; | |
3232dd02 PB |
3765 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3766 | return -EINVAL; | |
d63d1b5e JA |
3767 | |
3768 | req->sync.off = READ_ONCE(sqe->off); | |
3769 | req->sync.len = READ_ONCE(sqe->addr); | |
3770 | req->sync.mode = READ_ONCE(sqe->len); | |
3771 | return 0; | |
3772 | } | |
3773 | ||
45d189c6 | 3774 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 3775 | { |
ac45abc0 PB |
3776 | int ret; |
3777 | ||
d63d1b5e | 3778 | /* fallocate always requiring blocking context */ |
45d189c6 | 3779 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 3780 | return -EAGAIN; |
ac45abc0 PB |
3781 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3782 | req->sync.len); | |
ac45abc0 | 3783 | if (ret < 0) |
93d2bcd2 | 3784 | req_set_fail(req); |
e1e16097 | 3785 | io_req_complete(req, ret); |
5d17b4a4 JA |
3786 | return 0; |
3787 | } | |
3788 | ||
ec65fea5 | 3789 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3790 | { |
f8748881 | 3791 | const char __user *fname; |
15b71abe | 3792 | int ret; |
b7bb4f7d | 3793 | |
ec65fea5 | 3794 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3795 | return -EINVAL; |
ec65fea5 | 3796 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3797 | return -EBADF; |
03b1230c | 3798 | |
ec65fea5 PB |
3799 | /* open.how should be already initialised */ |
3800 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3801 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3802 | |
25e72d10 PB |
3803 | req->open.dfd = READ_ONCE(sqe->fd); |
3804 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3805 | req->open.filename = getname(fname); |
15b71abe JA |
3806 | if (IS_ERR(req->open.filename)) { |
3807 | ret = PTR_ERR(req->open.filename); | |
3808 | req->open.filename = NULL; | |
3809 | return ret; | |
3810 | } | |
4022e7af | 3811 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3812 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3813 | return 0; |
03b1230c JA |
3814 | } |
3815 | ||
ec65fea5 PB |
3816 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3817 | { | |
3818 | u64 flags, mode; | |
3819 | ||
14587a46 | 3820 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3821 | return -EINVAL; |
ec65fea5 PB |
3822 | mode = READ_ONCE(sqe->len); |
3823 | flags = READ_ONCE(sqe->open_flags); | |
3824 | req->open.how = build_open_how(flags, mode); | |
3825 | return __io_openat_prep(req, sqe); | |
3826 | } | |
3827 | ||
cebdb986 | 3828 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3829 | { |
cebdb986 | 3830 | struct open_how __user *how; |
cebdb986 | 3831 | size_t len; |
0fa03c62 JA |
3832 | int ret; |
3833 | ||
14587a46 | 3834 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3835 | return -EINVAL; |
cebdb986 JA |
3836 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3837 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3838 | if (len < OPEN_HOW_SIZE_VER0) |
3839 | return -EINVAL; | |
3529d8c2 | 3840 | |
cebdb986 JA |
3841 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3842 | len); | |
3843 | if (ret) | |
3844 | return ret; | |
3529d8c2 | 3845 | |
ec65fea5 | 3846 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3847 | } |
3848 | ||
45d189c6 | 3849 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
3850 | { |
3851 | struct open_flags op; | |
15b71abe | 3852 | struct file *file; |
3a81fd02 JA |
3853 | bool nonblock_set; |
3854 | bool resolve_nonblock; | |
15b71abe JA |
3855 | int ret; |
3856 | ||
cebdb986 | 3857 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3858 | if (ret) |
3859 | goto err; | |
3a81fd02 JA |
3860 | nonblock_set = op.open_flag & O_NONBLOCK; |
3861 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 3862 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
3863 | /* |
3864 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
3865 | * it'll always -EAGAIN | |
3866 | */ | |
3867 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
3868 | return -EAGAIN; | |
3869 | op.lookup_flags |= LOOKUP_CACHED; | |
3870 | op.open_flag |= O_NONBLOCK; | |
3871 | } | |
15b71abe | 3872 | |
4022e7af | 3873 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3874 | if (ret < 0) |
3875 | goto err; | |
3876 | ||
3877 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 3878 | if (IS_ERR(file)) { |
944d1444 | 3879 | /* |
12dcb58a PB |
3880 | * We could hang on to this 'fd' on retrying, but seems like |
3881 | * marginal gain for something that is now known to be a slower | |
3882 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 3883 | */ |
3a81fd02 | 3884 | put_unused_fd(ret); |
3a81fd02 | 3885 | |
15b71abe | 3886 | ret = PTR_ERR(file); |
12dcb58a PB |
3887 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
3888 | if (ret == -EAGAIN && | |
3889 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
3890 | return -EAGAIN; | |
3891 | goto err; | |
15b71abe | 3892 | } |
12dcb58a PB |
3893 | |
3894 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
3895 | file->f_flags &= ~O_NONBLOCK; | |
3896 | fsnotify_open(file); | |
3897 | fd_install(ret, file); | |
15b71abe JA |
3898 | err: |
3899 | putname(req->open.filename); | |
8fef80bf | 3900 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 3901 | if (ret < 0) |
93d2bcd2 | 3902 | req_set_fail(req); |
0bdf3398 | 3903 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
3904 | return 0; |
3905 | } | |
3906 | ||
45d189c6 | 3907 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 3908 | { |
e45cff58 | 3909 | return io_openat2(req, issue_flags); |
cebdb986 JA |
3910 | } |
3911 | ||
067524e9 JA |
3912 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3913 | const struct io_uring_sqe *sqe) | |
3914 | { | |
3915 | struct io_provide_buf *p = &req->pbuf; | |
3916 | u64 tmp; | |
3917 | ||
3918 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3919 | return -EINVAL; | |
3920 | ||
3921 | tmp = READ_ONCE(sqe->fd); | |
3922 | if (!tmp || tmp > USHRT_MAX) | |
3923 | return -EINVAL; | |
3924 | ||
3925 | memset(p, 0, sizeof(*p)); | |
3926 | p->nbufs = tmp; | |
3927 | p->bgid = READ_ONCE(sqe->buf_group); | |
3928 | return 0; | |
3929 | } | |
3930 | ||
3931 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3932 | int bgid, unsigned nbufs) | |
3933 | { | |
3934 | unsigned i = 0; | |
3935 | ||
3936 | /* shouldn't happen */ | |
3937 | if (!nbufs) | |
3938 | return 0; | |
3939 | ||
3940 | /* the head kbuf is the list itself */ | |
3941 | while (!list_empty(&buf->list)) { | |
3942 | struct io_buffer *nxt; | |
3943 | ||
3944 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3945 | list_del(&nxt->list); | |
3946 | kfree(nxt); | |
3947 | if (++i == nbufs) | |
3948 | return i; | |
3949 | } | |
3950 | i++; | |
3951 | kfree(buf); | |
9e15c3a0 | 3952 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
3953 | |
3954 | return i; | |
3955 | } | |
3956 | ||
889fca73 | 3957 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
3958 | { |
3959 | struct io_provide_buf *p = &req->pbuf; | |
3960 | struct io_ring_ctx *ctx = req->ctx; | |
3961 | struct io_buffer *head; | |
3962 | int ret = 0; | |
45d189c6 | 3963 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
3964 | |
3965 | io_ring_submit_lock(ctx, !force_nonblock); | |
3966 | ||
3967 | lockdep_assert_held(&ctx->uring_lock); | |
3968 | ||
3969 | ret = -ENOENT; | |
9e15c3a0 | 3970 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
3971 | if (head) |
3972 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 3973 | if (ret < 0) |
93d2bcd2 | 3974 | req_set_fail(req); |
067524e9 | 3975 | |
9fb8cb49 PB |
3976 | /* complete before unlock, IOPOLL may need the lock */ |
3977 | __io_req_complete(req, issue_flags, ret, 0); | |
3978 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
3979 | return 0; |
3980 | } | |
3981 | ||
ddf0322d JA |
3982 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3983 | const struct io_uring_sqe *sqe) | |
3984 | { | |
38134ada | 3985 | unsigned long size, tmp_check; |
ddf0322d JA |
3986 | struct io_provide_buf *p = &req->pbuf; |
3987 | u64 tmp; | |
3988 | ||
3989 | if (sqe->ioprio || sqe->rw_flags) | |
3990 | return -EINVAL; | |
3991 | ||
3992 | tmp = READ_ONCE(sqe->fd); | |
3993 | if (!tmp || tmp > USHRT_MAX) | |
3994 | return -E2BIG; | |
3995 | p->nbufs = tmp; | |
3996 | p->addr = READ_ONCE(sqe->addr); | |
3997 | p->len = READ_ONCE(sqe->len); | |
3998 | ||
38134ada PB |
3999 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4000 | &size)) | |
4001 | return -EOVERFLOW; | |
4002 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4003 | return -EOVERFLOW; | |
4004 | ||
d81269fe PB |
4005 | size = (unsigned long)p->len * p->nbufs; |
4006 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4007 | return -EFAULT; |
4008 | ||
4009 | p->bgid = READ_ONCE(sqe->buf_group); | |
4010 | tmp = READ_ONCE(sqe->off); | |
4011 | if (tmp > USHRT_MAX) | |
4012 | return -E2BIG; | |
4013 | p->bid = tmp; | |
4014 | return 0; | |
4015 | } | |
4016 | ||
4017 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4018 | { | |
4019 | struct io_buffer *buf; | |
4020 | u64 addr = pbuf->addr; | |
4021 | int i, bid = pbuf->bid; | |
4022 | ||
4023 | for (i = 0; i < pbuf->nbufs; i++) { | |
4024 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4025 | if (!buf) | |
4026 | break; | |
4027 | ||
4028 | buf->addr = addr; | |
d1f82808 | 4029 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4030 | buf->bid = bid; |
4031 | addr += pbuf->len; | |
4032 | bid++; | |
4033 | if (!*head) { | |
4034 | INIT_LIST_HEAD(&buf->list); | |
4035 | *head = buf; | |
4036 | } else { | |
4037 | list_add_tail(&buf->list, &(*head)->list); | |
4038 | } | |
4039 | } | |
4040 | ||
4041 | return i ? i : -ENOMEM; | |
4042 | } | |
4043 | ||
889fca73 | 4044 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4045 | { |
4046 | struct io_provide_buf *p = &req->pbuf; | |
4047 | struct io_ring_ctx *ctx = req->ctx; | |
4048 | struct io_buffer *head, *list; | |
4049 | int ret = 0; | |
45d189c6 | 4050 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4051 | |
4052 | io_ring_submit_lock(ctx, !force_nonblock); | |
4053 | ||
4054 | lockdep_assert_held(&ctx->uring_lock); | |
4055 | ||
9e15c3a0 | 4056 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4057 | |
4058 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4059 | if (ret >= 0 && !list) { |
4060 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4061 | if (ret < 0) | |
067524e9 | 4062 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4063 | } |
ddf0322d | 4064 | if (ret < 0) |
93d2bcd2 | 4065 | req_set_fail(req); |
9fb8cb49 PB |
4066 | /* complete before unlock, IOPOLL may need the lock */ |
4067 | __io_req_complete(req, issue_flags, ret, 0); | |
4068 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4069 | return 0; |
cebdb986 JA |
4070 | } |
4071 | ||
3e4827b0 JA |
4072 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4073 | const struct io_uring_sqe *sqe) | |
4074 | { | |
4075 | #if defined(CONFIG_EPOLL) | |
4076 | if (sqe->ioprio || sqe->buf_index) | |
4077 | return -EINVAL; | |
2d74d042 | 4078 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4079 | return -EINVAL; |
3e4827b0 JA |
4080 | |
4081 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4082 | req->epoll.op = READ_ONCE(sqe->len); | |
4083 | req->epoll.fd = READ_ONCE(sqe->off); | |
4084 | ||
4085 | if (ep_op_has_event(req->epoll.op)) { | |
4086 | struct epoll_event __user *ev; | |
4087 | ||
4088 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4089 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4090 | return -EFAULT; | |
4091 | } | |
4092 | ||
4093 | return 0; | |
4094 | #else | |
4095 | return -EOPNOTSUPP; | |
4096 | #endif | |
4097 | } | |
4098 | ||
889fca73 | 4099 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4100 | { |
4101 | #if defined(CONFIG_EPOLL) | |
4102 | struct io_epoll *ie = &req->epoll; | |
4103 | int ret; | |
45d189c6 | 4104 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4105 | |
4106 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4107 | if (force_nonblock && ret == -EAGAIN) | |
4108 | return -EAGAIN; | |
4109 | ||
4110 | if (ret < 0) | |
93d2bcd2 | 4111 | req_set_fail(req); |
889fca73 | 4112 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4113 | return 0; |
4114 | #else | |
4115 | return -EOPNOTSUPP; | |
4116 | #endif | |
4117 | } | |
4118 | ||
c1ca757b JA |
4119 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4120 | { | |
4121 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4122 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4123 | return -EINVAL; | |
3232dd02 PB |
4124 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4125 | return -EINVAL; | |
c1ca757b JA |
4126 | |
4127 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4128 | req->madvise.len = READ_ONCE(sqe->len); | |
4129 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4130 | return 0; | |
4131 | #else | |
4132 | return -EOPNOTSUPP; | |
4133 | #endif | |
4134 | } | |
4135 | ||
45d189c6 | 4136 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4137 | { |
4138 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4139 | struct io_madvise *ma = &req->madvise; | |
4140 | int ret; | |
4141 | ||
45d189c6 | 4142 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4143 | return -EAGAIN; |
4144 | ||
0726b01e | 4145 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4146 | if (ret < 0) |
93d2bcd2 | 4147 | req_set_fail(req); |
e1e16097 | 4148 | io_req_complete(req, ret); |
c1ca757b JA |
4149 | return 0; |
4150 | #else | |
4151 | return -EOPNOTSUPP; | |
4152 | #endif | |
4153 | } | |
4154 | ||
4840e418 JA |
4155 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4156 | { | |
4157 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4158 | return -EINVAL; | |
3232dd02 PB |
4159 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4160 | return -EINVAL; | |
4840e418 JA |
4161 | |
4162 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4163 | req->fadvise.len = READ_ONCE(sqe->len); | |
4164 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4165 | return 0; | |
4166 | } | |
4167 | ||
45d189c6 | 4168 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4169 | { |
4170 | struct io_fadvise *fa = &req->fadvise; | |
4171 | int ret; | |
4172 | ||
45d189c6 | 4173 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4174 | switch (fa->advice) { |
4175 | case POSIX_FADV_NORMAL: | |
4176 | case POSIX_FADV_RANDOM: | |
4177 | case POSIX_FADV_SEQUENTIAL: | |
4178 | break; | |
4179 | default: | |
4180 | return -EAGAIN; | |
4181 | } | |
4182 | } | |
4840e418 JA |
4183 | |
4184 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4185 | if (ret < 0) | |
93d2bcd2 | 4186 | req_set_fail(req); |
0bdf3398 | 4187 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4188 | return 0; |
4189 | } | |
4190 | ||
eddc7ef5 JA |
4191 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4192 | { | |
2d74d042 | 4193 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4194 | return -EINVAL; |
eddc7ef5 JA |
4195 | if (sqe->ioprio || sqe->buf_index) |
4196 | return -EINVAL; | |
9c280f90 | 4197 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4198 | return -EBADF; |
eddc7ef5 | 4199 | |
1d9e1288 BM |
4200 | req->statx.dfd = READ_ONCE(sqe->fd); |
4201 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4202 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4203 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4204 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4205 | |
4206 | return 0; | |
4207 | } | |
4208 | ||
45d189c6 | 4209 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4210 | { |
1d9e1288 | 4211 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4212 | int ret; |
4213 | ||
59d70013 | 4214 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4215 | return -EAGAIN; |
4216 | ||
e62753e4 BM |
4217 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4218 | ctx->buffer); | |
eddc7ef5 | 4219 | |
eddc7ef5 | 4220 | if (ret < 0) |
93d2bcd2 | 4221 | req_set_fail(req); |
e1e16097 | 4222 | io_req_complete(req, ret); |
eddc7ef5 JA |
4223 | return 0; |
4224 | } | |
4225 | ||
b5dba59e JA |
4226 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4227 | { | |
14587a46 | 4228 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4229 | return -EINVAL; |
b5dba59e JA |
4230 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4231 | sqe->rw_flags || sqe->buf_index) | |
4232 | return -EINVAL; | |
9c280f90 | 4233 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4234 | return -EBADF; |
b5dba59e JA |
4235 | |
4236 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4237 | return 0; |
b5dba59e JA |
4238 | } |
4239 | ||
889fca73 | 4240 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4241 | { |
9eac1904 | 4242 | struct files_struct *files = current->files; |
3af73b28 | 4243 | struct io_close *close = &req->close; |
9eac1904 | 4244 | struct fdtable *fdt; |
a1fde923 PB |
4245 | struct file *file = NULL; |
4246 | int ret = -EBADF; | |
b5dba59e | 4247 | |
9eac1904 JA |
4248 | spin_lock(&files->file_lock); |
4249 | fdt = files_fdtable(files); | |
4250 | if (close->fd >= fdt->max_fds) { | |
4251 | spin_unlock(&files->file_lock); | |
4252 | goto err; | |
4253 | } | |
4254 | file = fdt->fd[close->fd]; | |
a1fde923 | 4255 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4256 | spin_unlock(&files->file_lock); |
4257 | file = NULL; | |
4258 | goto err; | |
3af73b28 | 4259 | } |
b5dba59e JA |
4260 | |
4261 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4262 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4263 | spin_unlock(&files->file_lock); |
0bf0eefd | 4264 | return -EAGAIN; |
a2100672 | 4265 | } |
b5dba59e | 4266 | |
9eac1904 JA |
4267 | ret = __close_fd_get_file(close->fd, &file); |
4268 | spin_unlock(&files->file_lock); | |
4269 | if (ret < 0) { | |
4270 | if (ret == -ENOENT) | |
4271 | ret = -EBADF; | |
4272 | goto err; | |
4273 | } | |
4274 | ||
3af73b28 | 4275 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4276 | ret = filp_close(file, current->files); |
4277 | err: | |
3af73b28 | 4278 | if (ret < 0) |
93d2bcd2 | 4279 | req_set_fail(req); |
9eac1904 JA |
4280 | if (file) |
4281 | fput(file); | |
889fca73 | 4282 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4283 | return 0; |
b5dba59e JA |
4284 | } |
4285 | ||
1155c76a | 4286 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4287 | { |
4288 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4289 | |
5d17b4a4 JA |
4290 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4291 | return -EINVAL; | |
4292 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4293 | return -EINVAL; | |
4294 | ||
8ed8d3c3 JA |
4295 | req->sync.off = READ_ONCE(sqe->off); |
4296 | req->sync.len = READ_ONCE(sqe->len); | |
4297 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4298 | return 0; |
4299 | } | |
4300 | ||
45d189c6 | 4301 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4302 | { |
8ed8d3c3 JA |
4303 | int ret; |
4304 | ||
ac45abc0 | 4305 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4306 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4307 | return -EAGAIN; |
4308 | ||
9adbd45d | 4309 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4310 | req->sync.flags); |
4311 | if (ret < 0) | |
93d2bcd2 | 4312 | req_set_fail(req); |
e1e16097 | 4313 | io_req_complete(req, ret); |
5d17b4a4 JA |
4314 | return 0; |
4315 | } | |
4316 | ||
469956e8 | 4317 | #if defined(CONFIG_NET) |
02d27d89 PB |
4318 | static int io_setup_async_msg(struct io_kiocb *req, |
4319 | struct io_async_msghdr *kmsg) | |
4320 | { | |
e8c2bc1f JA |
4321 | struct io_async_msghdr *async_msg = req->async_data; |
4322 | ||
4323 | if (async_msg) | |
02d27d89 | 4324 | return -EAGAIN; |
e8c2bc1f | 4325 | if (io_alloc_async_data(req)) { |
257e84a5 | 4326 | kfree(kmsg->free_iov); |
02d27d89 PB |
4327 | return -ENOMEM; |
4328 | } | |
e8c2bc1f | 4329 | async_msg = req->async_data; |
02d27d89 | 4330 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4331 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4332 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4333 | /* if were using fast_iov, set it to the new one */ |
4334 | if (!async_msg->free_iov) | |
4335 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4336 | ||
02d27d89 PB |
4337 | return -EAGAIN; |
4338 | } | |
4339 | ||
2ae523ed PB |
4340 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4341 | struct io_async_msghdr *iomsg) | |
4342 | { | |
2ae523ed | 4343 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4344 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4345 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4346 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4347 | } |
4348 | ||
93642ef8 PB |
4349 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4350 | { | |
4351 | int ret; | |
4352 | ||
93642ef8 PB |
4353 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4354 | if (!ret) | |
4355 | req->flags |= REQ_F_NEED_CLEANUP; | |
4356 | return ret; | |
4357 | } | |
4358 | ||
3529d8c2 | 4359 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4360 | { |
e47293fd | 4361 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4362 | |
d2b6f48b PB |
4363 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4364 | return -EINVAL; | |
4365 | ||
270a5940 | 4366 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4367 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4368 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4369 | if (sr->msg_flags & MSG_DONTWAIT) | |
4370 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4371 | |
d8768362 JA |
4372 | #ifdef CONFIG_COMPAT |
4373 | if (req->ctx->compat) | |
4374 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4375 | #endif | |
93642ef8 | 4376 | return 0; |
03b1230c JA |
4377 | } |
4378 | ||
889fca73 | 4379 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4380 | { |
6b754c8b | 4381 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4382 | struct socket *sock; |
7a7cacba | 4383 | unsigned flags; |
0031275d | 4384 | int min_ret = 0; |
0fa03c62 JA |
4385 | int ret; |
4386 | ||
dba4a925 | 4387 | sock = sock_from_file(req->file); |
7a7cacba | 4388 | if (unlikely(!sock)) |
dba4a925 | 4389 | return -ENOTSOCK; |
3529d8c2 | 4390 | |
257e84a5 PB |
4391 | kmsg = req->async_data; |
4392 | if (!kmsg) { | |
7a7cacba PB |
4393 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4394 | if (ret) | |
4395 | return ret; | |
4396 | kmsg = &iomsg; | |
0fa03c62 | 4397 | } |
0fa03c62 | 4398 | |
04411806 PB |
4399 | flags = req->sr_msg.msg_flags; |
4400 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4401 | flags |= MSG_DONTWAIT; |
0031275d SM |
4402 | if (flags & MSG_WAITALL) |
4403 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4404 | ||
7a7cacba | 4405 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4406 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4407 | return io_setup_async_msg(req, kmsg); |
4408 | if (ret == -ERESTARTSYS) | |
4409 | ret = -EINTR; | |
0fa03c62 | 4410 | |
257e84a5 PB |
4411 | /* fast path, check for non-NULL to avoid function call */ |
4412 | if (kmsg->free_iov) | |
4413 | kfree(kmsg->free_iov); | |
99bc4c38 | 4414 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4415 | if (ret < min_ret) |
93d2bcd2 | 4416 | req_set_fail(req); |
889fca73 | 4417 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4418 | return 0; |
03b1230c | 4419 | } |
aa1fa28f | 4420 | |
889fca73 | 4421 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4422 | { |
7a7cacba PB |
4423 | struct io_sr_msg *sr = &req->sr_msg; |
4424 | struct msghdr msg; | |
4425 | struct iovec iov; | |
fddaface | 4426 | struct socket *sock; |
7a7cacba | 4427 | unsigned flags; |
0031275d | 4428 | int min_ret = 0; |
fddaface JA |
4429 | int ret; |
4430 | ||
dba4a925 | 4431 | sock = sock_from_file(req->file); |
7a7cacba | 4432 | if (unlikely(!sock)) |
dba4a925 | 4433 | return -ENOTSOCK; |
fddaface | 4434 | |
7a7cacba PB |
4435 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4436 | if (unlikely(ret)) | |
14db8411 | 4437 | return ret; |
fddaface | 4438 | |
7a7cacba PB |
4439 | msg.msg_name = NULL; |
4440 | msg.msg_control = NULL; | |
4441 | msg.msg_controllen = 0; | |
4442 | msg.msg_namelen = 0; | |
fddaface | 4443 | |
04411806 PB |
4444 | flags = req->sr_msg.msg_flags; |
4445 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4446 | flags |= MSG_DONTWAIT; |
0031275d SM |
4447 | if (flags & MSG_WAITALL) |
4448 | min_ret = iov_iter_count(&msg.msg_iter); | |
4449 | ||
7a7cacba PB |
4450 | msg.msg_flags = flags; |
4451 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4452 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4453 | return -EAGAIN; |
4454 | if (ret == -ERESTARTSYS) | |
4455 | ret = -EINTR; | |
fddaface | 4456 | |
0031275d | 4457 | if (ret < min_ret) |
93d2bcd2 | 4458 | req_set_fail(req); |
889fca73 | 4459 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4460 | return 0; |
fddaface JA |
4461 | } |
4462 | ||
1400e697 PB |
4463 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4464 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4465 | { |
4466 | struct io_sr_msg *sr = &req->sr_msg; | |
4467 | struct iovec __user *uiov; | |
4468 | size_t iov_len; | |
4469 | int ret; | |
4470 | ||
1400e697 PB |
4471 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4472 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4473 | if (ret) |
4474 | return ret; | |
4475 | ||
4476 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4477 | if (iov_len > 1) | |
4478 | return -EINVAL; | |
5476dfed | 4479 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4480 | return -EFAULT; |
5476dfed | 4481 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4482 | iomsg->free_iov = NULL; |
52de1fe1 | 4483 | } else { |
257e84a5 | 4484 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4485 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4486 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4487 | false); |
52de1fe1 JA |
4488 | if (ret > 0) |
4489 | ret = 0; | |
4490 | } | |
4491 | ||
4492 | return ret; | |
4493 | } | |
4494 | ||
4495 | #ifdef CONFIG_COMPAT | |
4496 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4497 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4498 | { |
52de1fe1 JA |
4499 | struct io_sr_msg *sr = &req->sr_msg; |
4500 | struct compat_iovec __user *uiov; | |
4501 | compat_uptr_t ptr; | |
4502 | compat_size_t len; | |
4503 | int ret; | |
4504 | ||
4af3417a PB |
4505 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4506 | &ptr, &len); | |
52de1fe1 JA |
4507 | if (ret) |
4508 | return ret; | |
4509 | ||
4510 | uiov = compat_ptr(ptr); | |
4511 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4512 | compat_ssize_t clen; | |
4513 | ||
4514 | if (len > 1) | |
4515 | return -EINVAL; | |
4516 | if (!access_ok(uiov, sizeof(*uiov))) | |
4517 | return -EFAULT; | |
4518 | if (__get_user(clen, &uiov->iov_len)) | |
4519 | return -EFAULT; | |
4520 | if (clen < 0) | |
4521 | return -EINVAL; | |
2d280bc8 | 4522 | sr->len = clen; |
257e84a5 | 4523 | iomsg->free_iov = NULL; |
52de1fe1 | 4524 | } else { |
257e84a5 | 4525 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4526 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4527 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4528 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4529 | if (ret < 0) |
4530 | return ret; | |
4531 | } | |
4532 | ||
4533 | return 0; | |
4534 | } | |
4535 | #endif | |
4536 | ||
1400e697 PB |
4537 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4538 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4539 | { |
1400e697 | 4540 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4541 | |
4542 | #ifdef CONFIG_COMPAT | |
4543 | if (req->ctx->compat) | |
1400e697 | 4544 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4545 | #endif |
52de1fe1 | 4546 | |
1400e697 | 4547 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4548 | } |
4549 | ||
bcda7baa | 4550 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4551 | bool needs_lock) |
bcda7baa JA |
4552 | { |
4553 | struct io_sr_msg *sr = &req->sr_msg; | |
4554 | struct io_buffer *kbuf; | |
4555 | ||
bcda7baa JA |
4556 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4557 | if (IS_ERR(kbuf)) | |
4558 | return kbuf; | |
4559 | ||
4560 | sr->kbuf = kbuf; | |
4561 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4562 | return kbuf; |
fddaface JA |
4563 | } |
4564 | ||
7fbb1b54 PB |
4565 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4566 | { | |
4567 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4568 | } | |
4569 | ||
93642ef8 | 4570 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4571 | { |
99bc4c38 | 4572 | int ret; |
3529d8c2 | 4573 | |
93642ef8 PB |
4574 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4575 | if (!ret) | |
4576 | req->flags |= REQ_F_NEED_CLEANUP; | |
4577 | return ret; | |
4578 | } | |
4579 | ||
4580 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4581 | { | |
4582 | struct io_sr_msg *sr = &req->sr_msg; | |
4583 | ||
d2b6f48b PB |
4584 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4585 | return -EINVAL; | |
4586 | ||
270a5940 | 4587 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4588 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4589 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4590 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4591 | if (sr->msg_flags & MSG_DONTWAIT) | |
4592 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4593 | |
d8768362 JA |
4594 | #ifdef CONFIG_COMPAT |
4595 | if (req->ctx->compat) | |
4596 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4597 | #endif | |
93642ef8 | 4598 | return 0; |
aa1fa28f JA |
4599 | } |
4600 | ||
889fca73 | 4601 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4602 | { |
6b754c8b | 4603 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4604 | struct socket *sock; |
7fbb1b54 | 4605 | struct io_buffer *kbuf; |
7a7cacba | 4606 | unsigned flags; |
0031275d | 4607 | int min_ret = 0; |
52de1fe1 | 4608 | int ret, cflags = 0; |
45d189c6 | 4609 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4610 | |
dba4a925 | 4611 | sock = sock_from_file(req->file); |
7a7cacba | 4612 | if (unlikely(!sock)) |
dba4a925 | 4613 | return -ENOTSOCK; |
3529d8c2 | 4614 | |
257e84a5 PB |
4615 | kmsg = req->async_data; |
4616 | if (!kmsg) { | |
7a7cacba PB |
4617 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4618 | if (ret) | |
681fda8d | 4619 | return ret; |
7a7cacba PB |
4620 | kmsg = &iomsg; |
4621 | } | |
03b1230c | 4622 | |
bc02ef33 | 4623 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4624 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4625 | if (IS_ERR(kbuf)) |
52de1fe1 | 4626 | return PTR_ERR(kbuf); |
7a7cacba | 4627 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4628 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4629 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4630 | 1, req->sr_msg.len); |
4631 | } | |
52de1fe1 | 4632 | |
04411806 PB |
4633 | flags = req->sr_msg.msg_flags; |
4634 | if (force_nonblock) | |
7a7cacba | 4635 | flags |= MSG_DONTWAIT; |
0031275d SM |
4636 | if (flags & MSG_WAITALL) |
4637 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4638 | ||
7a7cacba PB |
4639 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4640 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4641 | if (force_nonblock && ret == -EAGAIN) |
4642 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4643 | if (ret == -ERESTARTSYS) |
4644 | ret = -EINTR; | |
03b1230c | 4645 | |
7fbb1b54 PB |
4646 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4647 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4648 | /* fast path, check for non-NULL to avoid function call */ |
4649 | if (kmsg->free_iov) | |
4650 | kfree(kmsg->free_iov); | |
99bc4c38 | 4651 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4652 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4653 | req_set_fail(req); |
889fca73 | 4654 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4655 | return 0; |
0fa03c62 | 4656 | } |
5d17b4a4 | 4657 | |
889fca73 | 4658 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4659 | { |
6b754c8b | 4660 | struct io_buffer *kbuf; |
7a7cacba PB |
4661 | struct io_sr_msg *sr = &req->sr_msg; |
4662 | struct msghdr msg; | |
4663 | void __user *buf = sr->buf; | |
fddaface | 4664 | struct socket *sock; |
7a7cacba PB |
4665 | struct iovec iov; |
4666 | unsigned flags; | |
0031275d | 4667 | int min_ret = 0; |
bcda7baa | 4668 | int ret, cflags = 0; |
45d189c6 | 4669 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4670 | |
dba4a925 | 4671 | sock = sock_from_file(req->file); |
7a7cacba | 4672 | if (unlikely(!sock)) |
dba4a925 | 4673 | return -ENOTSOCK; |
fddaface | 4674 | |
bc02ef33 | 4675 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4676 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4677 | if (IS_ERR(kbuf)) |
4678 | return PTR_ERR(kbuf); | |
7a7cacba | 4679 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4680 | } |
bcda7baa | 4681 | |
7a7cacba | 4682 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4683 | if (unlikely(ret)) |
4684 | goto out_free; | |
fddaface | 4685 | |
7a7cacba PB |
4686 | msg.msg_name = NULL; |
4687 | msg.msg_control = NULL; | |
4688 | msg.msg_controllen = 0; | |
4689 | msg.msg_namelen = 0; | |
4690 | msg.msg_iocb = NULL; | |
4691 | msg.msg_flags = 0; | |
fddaface | 4692 | |
04411806 PB |
4693 | flags = req->sr_msg.msg_flags; |
4694 | if (force_nonblock) | |
7a7cacba | 4695 | flags |= MSG_DONTWAIT; |
0031275d SM |
4696 | if (flags & MSG_WAITALL) |
4697 | min_ret = iov_iter_count(&msg.msg_iter); | |
4698 | ||
7a7cacba PB |
4699 | ret = sock_recvmsg(sock, &msg, flags); |
4700 | if (force_nonblock && ret == -EAGAIN) | |
4701 | return -EAGAIN; | |
4702 | if (ret == -ERESTARTSYS) | |
4703 | ret = -EINTR; | |
14c32eee | 4704 | out_free: |
7fbb1b54 PB |
4705 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4706 | cflags = io_put_recv_kbuf(req); | |
0031275d | 4707 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4708 | req_set_fail(req); |
889fca73 | 4709 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 4710 | return 0; |
fddaface JA |
4711 | } |
4712 | ||
3529d8c2 | 4713 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4714 | { |
8ed8d3c3 JA |
4715 | struct io_accept *accept = &req->accept; |
4716 | ||
14587a46 | 4717 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4718 | return -EINVAL; |
8042d6ce | 4719 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4720 | return -EINVAL; |
4721 | ||
d55e5f5b JA |
4722 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4723 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4724 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4725 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4726 | return 0; |
8ed8d3c3 | 4727 | } |
17f2fe35 | 4728 | |
889fca73 | 4729 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
4730 | { |
4731 | struct io_accept *accept = &req->accept; | |
45d189c6 | 4732 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 4733 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4734 | int ret; |
4735 | ||
e697deed JX |
4736 | if (req->file->f_flags & O_NONBLOCK) |
4737 | req->flags |= REQ_F_NOWAIT; | |
4738 | ||
8ed8d3c3 | 4739 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4740 | accept->addr_len, accept->flags, |
4741 | accept->nofile); | |
8ed8d3c3 | 4742 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4743 | return -EAGAIN; |
ac45abc0 PB |
4744 | if (ret < 0) { |
4745 | if (ret == -ERESTARTSYS) | |
4746 | ret = -EINTR; | |
93d2bcd2 | 4747 | req_set_fail(req); |
ac45abc0 | 4748 | } |
889fca73 | 4749 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 4750 | return 0; |
8ed8d3c3 JA |
4751 | } |
4752 | ||
93642ef8 PB |
4753 | static int io_connect_prep_async(struct io_kiocb *req) |
4754 | { | |
4755 | struct io_async_connect *io = req->async_data; | |
4756 | struct io_connect *conn = &req->connect; | |
4757 | ||
4758 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
4759 | } | |
4760 | ||
3529d8c2 | 4761 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4762 | { |
3529d8c2 | 4763 | struct io_connect *conn = &req->connect; |
f499a021 | 4764 | |
14587a46 | 4765 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4766 | return -EINVAL; |
4767 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4768 | return -EINVAL; | |
4769 | ||
3529d8c2 JA |
4770 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4771 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 4772 | return 0; |
f499a021 JA |
4773 | } |
4774 | ||
889fca73 | 4775 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 4776 | { |
e8c2bc1f | 4777 | struct io_async_connect __io, *io; |
f8e85cf2 | 4778 | unsigned file_flags; |
3fbb51c1 | 4779 | int ret; |
45d189c6 | 4780 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 4781 | |
e8c2bc1f JA |
4782 | if (req->async_data) { |
4783 | io = req->async_data; | |
f499a021 | 4784 | } else { |
3529d8c2 JA |
4785 | ret = move_addr_to_kernel(req->connect.addr, |
4786 | req->connect.addr_len, | |
e8c2bc1f | 4787 | &__io.address); |
f499a021 JA |
4788 | if (ret) |
4789 | goto out; | |
4790 | io = &__io; | |
4791 | } | |
4792 | ||
3fbb51c1 JA |
4793 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4794 | ||
e8c2bc1f | 4795 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4796 | req->connect.addr_len, file_flags); |
87f80d62 | 4797 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4798 | if (req->async_data) |
b7bb4f7d | 4799 | return -EAGAIN; |
e8c2bc1f | 4800 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4801 | ret = -ENOMEM; |
4802 | goto out; | |
4803 | } | |
e8c2bc1f | 4804 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 4805 | return -EAGAIN; |
f499a021 | 4806 | } |
f8e85cf2 JA |
4807 | if (ret == -ERESTARTSYS) |
4808 | ret = -EINTR; | |
f499a021 | 4809 | out: |
4e88d6e7 | 4810 | if (ret < 0) |
93d2bcd2 | 4811 | req_set_fail(req); |
889fca73 | 4812 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 4813 | return 0; |
469956e8 Y |
4814 | } |
4815 | #else /* !CONFIG_NET */ | |
99a10081 JA |
4816 | #define IO_NETOP_FN(op) \ |
4817 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
4818 | { \ | |
4819 | return -EOPNOTSUPP; \ | |
4820 | } | |
4821 | ||
4822 | #define IO_NETOP_PREP(op) \ | |
4823 | IO_NETOP_FN(op) \ | |
4824 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
4825 | { \ | |
4826 | return -EOPNOTSUPP; \ | |
4827 | } \ | |
4828 | ||
4829 | #define IO_NETOP_PREP_ASYNC(op) \ | |
4830 | IO_NETOP_PREP(op) \ | |
4831 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
4832 | { \ | |
4833 | return -EOPNOTSUPP; \ | |
4834 | } | |
4835 | ||
4836 | IO_NETOP_PREP_ASYNC(sendmsg); | |
4837 | IO_NETOP_PREP_ASYNC(recvmsg); | |
4838 | IO_NETOP_PREP_ASYNC(connect); | |
4839 | IO_NETOP_PREP(accept); | |
4840 | IO_NETOP_FN(send); | |
4841 | IO_NETOP_FN(recv); | |
469956e8 | 4842 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4843 | |
d7718a9d JA |
4844 | struct io_poll_table { |
4845 | struct poll_table_struct pt; | |
4846 | struct io_kiocb *req; | |
68b11e8b | 4847 | int nr_entries; |
d7718a9d JA |
4848 | int error; |
4849 | }; | |
ce593a6c | 4850 | |
d7718a9d | 4851 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 4852 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 4853 | { |
d7718a9d JA |
4854 | /* for instances that support it check for an event match first: */ |
4855 | if (mask && !(mask & poll->events)) | |
4856 | return 0; | |
4857 | ||
4858 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4859 | ||
4860 | list_del_init(&poll->wait.entry); | |
4861 | ||
d7718a9d | 4862 | req->result = mask; |
5b0a6acc | 4863 | req->io_task_work.func = func; |
6d816e08 | 4864 | |
d7718a9d | 4865 | /* |
e3aabf95 JA |
4866 | * If this fails, then the task is exiting. When a task exits, the |
4867 | * work gets canceled, so just cancel this request as well instead | |
4868 | * of executing it. We can't safely execute it anyway, as we may not | |
4869 | * have the needed state needed for it anyway. | |
d7718a9d | 4870 | */ |
e09ee510 | 4871 | io_req_task_work_add(req); |
d7718a9d JA |
4872 | return 1; |
4873 | } | |
4874 | ||
74ce6ce4 JA |
4875 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4876 | __acquires(&req->ctx->completion_lock) | |
4877 | { | |
4878 | struct io_ring_ctx *ctx = req->ctx; | |
4879 | ||
e09ee510 PB |
4880 | if (unlikely(req->task->flags & PF_EXITING)) |
4881 | WRITE_ONCE(poll->canceled, true); | |
4882 | ||
74ce6ce4 JA |
4883 | if (!req->result && !READ_ONCE(poll->canceled)) { |
4884 | struct poll_table_struct pt = { ._key = poll->events }; | |
4885 | ||
4886 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4887 | } | |
4888 | ||
4889 | spin_lock_irq(&ctx->completion_lock); | |
4890 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4891 | add_wait_queue(poll->head, &poll->wait); | |
4892 | return true; | |
4893 | } | |
4894 | ||
4895 | return false; | |
4896 | } | |
4897 | ||
d4e7cd36 | 4898 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4899 | { |
e8c2bc1f | 4900 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 4901 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 4902 | return req->async_data; |
d4e7cd36 JA |
4903 | return req->apoll->double_poll; |
4904 | } | |
4905 | ||
4906 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4907 | { | |
4908 | if (req->opcode == IORING_OP_POLL_ADD) | |
4909 | return &req->poll; | |
4910 | return &req->apoll->poll; | |
4911 | } | |
4912 | ||
4913 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 4914 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
4915 | { |
4916 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4917 | |
4918 | lockdep_assert_held(&req->ctx->completion_lock); | |
4919 | ||
4920 | if (poll && poll->head) { | |
4921 | struct wait_queue_head *head = poll->head; | |
4922 | ||
4923 | spin_lock(&head->lock); | |
4924 | list_del_init(&poll->wait.entry); | |
4925 | if (poll->wait.private) | |
de9b4cca | 4926 | req_ref_put(req); |
18bceab1 JA |
4927 | poll->head = NULL; |
4928 | spin_unlock(&head->lock); | |
4929 | } | |
4930 | } | |
4931 | ||
e27414be | 4932 | static bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 4933 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
4934 | { |
4935 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 4936 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 4937 | int error; |
18bceab1 | 4938 | |
e27414be | 4939 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 4940 | error = -ECANCELED; |
88e41cf9 | 4941 | req->poll.events |= EPOLLONESHOT; |
e27414be | 4942 | } else { |
5082620f | 4943 | error = mangle_poll(mask); |
e27414be | 4944 | } |
b69de288 JA |
4945 | if (req->poll.events & EPOLLONESHOT) |
4946 | flags = 0; | |
d4d19c19 | 4947 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
88e41cf9 JA |
4948 | req->poll.done = true; |
4949 | flags = 0; | |
4950 | } | |
7b289c38 HX |
4951 | if (flags & IORING_CQE_F_MORE) |
4952 | ctx->cq_extra++; | |
18bceab1 | 4953 | |
18bceab1 | 4954 | io_commit_cqring(ctx); |
88e41cf9 | 4955 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
4956 | } |
4957 | ||
5b0a6acc | 4958 | static void io_poll_task_func(struct io_kiocb *req) |
18bceab1 JA |
4959 | { |
4960 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 4961 | struct io_kiocb *nxt; |
18bceab1 JA |
4962 | |
4963 | if (io_poll_rewait(req, &req->poll)) { | |
4964 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 | 4965 | } else { |
f40b964a | 4966 | bool done; |
18bceab1 | 4967 | |
e27414be | 4968 | done = io_poll_complete(req, req->result); |
88e41cf9 | 4969 | if (done) { |
a890d01e | 4970 | io_poll_remove_double(req); |
88e41cf9 | 4971 | hash_del(&req->hash_node); |
f40b964a | 4972 | } else { |
88e41cf9 JA |
4973 | req->result = 0; |
4974 | add_wait_queue(req->poll.head, &req->poll.wait); | |
4975 | } | |
dd221f46 | 4976 | spin_unlock_irq(&ctx->completion_lock); |
dd221f46 | 4977 | io_cqring_ev_posted(ctx); |
18bceab1 | 4978 | |
88e41cf9 JA |
4979 | if (done) { |
4980 | nxt = io_put_req_find_next(req); | |
4981 | if (nxt) | |
5b0a6acc | 4982 | io_req_task_submit(nxt); |
88e41cf9 | 4983 | } |
dd221f46 | 4984 | } |
18bceab1 JA |
4985 | } |
4986 | ||
4987 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4988 | int sync, void *key) | |
4989 | { | |
4990 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4991 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4992 | __poll_t mask = key_to_poll(key); |
4993 | ||
4994 | /* for instances that support it check for an event match first: */ | |
4995 | if (mask && !(mask & poll->events)) | |
4996 | return 0; | |
88e41cf9 JA |
4997 | if (!(poll->events & EPOLLONESHOT)) |
4998 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 4999 | |
8706e04e JA |
5000 | list_del_init(&wait->entry); |
5001 | ||
9ce85ef2 | 5002 | if (poll->head) { |
18bceab1 JA |
5003 | bool done; |
5004 | ||
807abcb0 JA |
5005 | spin_lock(&poll->head->lock); |
5006 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5007 | if (!done) |
807abcb0 | 5008 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5009 | /* make sure double remove sees this as being gone */ |
5010 | wait->private = NULL; | |
807abcb0 | 5011 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5012 | if (!done) { |
5013 | /* use wait func handler, so it matches the rq type */ | |
5014 | poll->wait.func(&poll->wait, mode, sync, key); | |
5015 | } | |
18bceab1 | 5016 | } |
de9b4cca | 5017 | req_ref_put(req); |
18bceab1 JA |
5018 | return 1; |
5019 | } | |
5020 | ||
5021 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5022 | wait_queue_func_t wake_func) | |
5023 | { | |
5024 | poll->head = NULL; | |
5025 | poll->done = false; | |
5026 | poll->canceled = false; | |
464dca61 JA |
5027 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5028 | /* mask in events that we always want/need */ | |
5029 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5030 | INIT_LIST_HEAD(&poll->wait.entry); |
5031 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5032 | } | |
5033 | ||
5034 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5035 | struct wait_queue_head *head, |
5036 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5037 | { |
5038 | struct io_kiocb *req = pt->req; | |
5039 | ||
5040 | /* | |
68b11e8b PB |
5041 | * The file being polled uses multiple waitqueues for poll handling |
5042 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5043 | * if this happens. | |
18bceab1 | 5044 | */ |
68b11e8b | 5045 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5046 | struct io_poll_iocb *poll_one = poll; |
5047 | ||
18bceab1 | 5048 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5049 | if (*poll_ptr) { |
18bceab1 JA |
5050 | pt->error = -EINVAL; |
5051 | return; | |
5052 | } | |
ea6a693d JA |
5053 | /* |
5054 | * Can't handle multishot for double wait for now, turn it | |
5055 | * into one-shot mode. | |
5056 | */ | |
7a274727 PB |
5057 | if (!(poll_one->events & EPOLLONESHOT)) |
5058 | poll_one->events |= EPOLLONESHOT; | |
1c3b3e65 | 5059 | /* double add on the same waitqueue head, ignore */ |
7a274727 | 5060 | if (poll_one->head == head) |
1c3b3e65 | 5061 | return; |
18bceab1 JA |
5062 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5063 | if (!poll) { | |
5064 | pt->error = -ENOMEM; | |
5065 | return; | |
5066 | } | |
58852d4d | 5067 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5068 | req_ref_get(req); |
18bceab1 | 5069 | poll->wait.private = req; |
807abcb0 | 5070 | *poll_ptr = poll; |
18bceab1 JA |
5071 | } |
5072 | ||
68b11e8b | 5073 | pt->nr_entries++; |
18bceab1 | 5074 | poll->head = head; |
a31eb4a2 JX |
5075 | |
5076 | if (poll->events & EPOLLEXCLUSIVE) | |
5077 | add_wait_queue_exclusive(head, &poll->wait); | |
5078 | else | |
5079 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5080 | } |
5081 | ||
5082 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5083 | struct poll_table_struct *p) | |
5084 | { | |
5085 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5086 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5087 | |
807abcb0 | 5088 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5089 | } |
5090 | ||
5b0a6acc | 5091 | static void io_async_task_func(struct io_kiocb *req) |
d7718a9d | 5092 | { |
d7718a9d JA |
5093 | struct async_poll *apoll = req->apoll; |
5094 | struct io_ring_ctx *ctx = req->ctx; | |
5095 | ||
236daeae | 5096 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5097 | |
74ce6ce4 | 5098 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5099 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 5100 | return; |
d7718a9d JA |
5101 | } |
5102 | ||
0ea13b44 | 5103 | hash_del(&req->hash_node); |
d4e7cd36 | 5104 | io_poll_remove_double(req); |
74ce6ce4 JA |
5105 | spin_unlock_irq(&ctx->completion_lock); |
5106 | ||
0be0b0e3 | 5107 | if (!READ_ONCE(apoll->poll.canceled)) |
5b0a6acc | 5108 | io_req_task_submit(req); |
0be0b0e3 | 5109 | else |
2593553a | 5110 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5111 | } |
5112 | ||
5113 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5114 | void *key) | |
5115 | { | |
5116 | struct io_kiocb *req = wait->private; | |
5117 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5118 | ||
5119 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5120 | key_to_poll(key)); | |
5121 | ||
5122 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5123 | } | |
5124 | ||
5125 | static void io_poll_req_insert(struct io_kiocb *req) | |
5126 | { | |
5127 | struct io_ring_ctx *ctx = req->ctx; | |
5128 | struct hlist_head *list; | |
5129 | ||
5130 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5131 | hlist_add_head(&req->hash_node, list); | |
5132 | } | |
5133 | ||
5134 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5135 | struct io_poll_iocb *poll, | |
5136 | struct io_poll_table *ipt, __poll_t mask, | |
5137 | wait_queue_func_t wake_func) | |
5138 | __acquires(&ctx->completion_lock) | |
5139 | { | |
5140 | struct io_ring_ctx *ctx = req->ctx; | |
5141 | bool cancel = false; | |
5142 | ||
4d52f338 | 5143 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5144 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5145 | poll->file = req->file; |
18bceab1 | 5146 | poll->wait.private = req; |
d7718a9d JA |
5147 | |
5148 | ipt->pt._key = mask; | |
5149 | ipt->req = req; | |
68b11e8b PB |
5150 | ipt->error = 0; |
5151 | ipt->nr_entries = 0; | |
d7718a9d | 5152 | |
d7718a9d | 5153 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5154 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5155 | ipt->error = -EINVAL; | |
d7718a9d JA |
5156 | |
5157 | spin_lock_irq(&ctx->completion_lock); | |
a890d01e | 5158 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5159 | io_poll_remove_double(req); |
d7718a9d JA |
5160 | if (likely(poll->head)) { |
5161 | spin_lock(&poll->head->lock); | |
5162 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5163 | if (ipt->error) | |
5164 | cancel = true; | |
5165 | ipt->error = 0; | |
5166 | mask = 0; | |
5167 | } | |
88e41cf9 | 5168 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5169 | list_del_init(&poll->wait.entry); |
5170 | else if (cancel) | |
5171 | WRITE_ONCE(poll->canceled, true); | |
5172 | else if (!poll->done) /* actually waiting for an event */ | |
5173 | io_poll_req_insert(req); | |
5174 | spin_unlock(&poll->head->lock); | |
5175 | } | |
5176 | ||
5177 | return mask; | |
5178 | } | |
5179 | ||
59b735ae OL |
5180 | enum { |
5181 | IO_APOLL_OK, | |
5182 | IO_APOLL_ABORTED, | |
5183 | IO_APOLL_READY | |
5184 | }; | |
5185 | ||
5186 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5187 | { |
5188 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5189 | struct io_ring_ctx *ctx = req->ctx; | |
5190 | struct async_poll *apoll; | |
5191 | struct io_poll_table ipt; | |
b2d9c3da | 5192 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5193 | int rw; |
d7718a9d JA |
5194 | |
5195 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5196 | return IO_APOLL_ABORTED; |
24c74678 | 5197 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5198 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5199 | if (!def->pollin && !def->pollout) |
5200 | return IO_APOLL_ABORTED; | |
5201 | ||
5202 | if (def->pollin) { | |
9dab14b8 | 5203 | rw = READ; |
b2d9c3da PB |
5204 | mask |= POLLIN | POLLRDNORM; |
5205 | ||
5206 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5207 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5208 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5209 | mask &= ~POLLIN; | |
5210 | } else { | |
9dab14b8 | 5211 | rw = WRITE; |
b2d9c3da PB |
5212 | mask |= POLLOUT | POLLWRNORM; |
5213 | } | |
5214 | ||
9dab14b8 | 5215 | /* if we can't nonblock try, then no point in arming a poll handler */ |
7b29f92d | 5216 | if (!io_file_supports_async(req, rw)) |
59b735ae | 5217 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5218 | |
5219 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5220 | if (unlikely(!apoll)) | |
59b735ae | 5221 | return IO_APOLL_ABORTED; |
807abcb0 | 5222 | apoll->double_poll = NULL; |
d7718a9d | 5223 | req->apoll = apoll; |
b2d9c3da | 5224 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
5225 | ipt.pt._qproc = io_async_queue_proc; |
5226 | ||
5227 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5228 | io_async_wake); | |
a36da65c | 5229 | if (ret || ipt.error) { |
d7718a9d | 5230 | spin_unlock_irq(&ctx->completion_lock); |
59b735ae OL |
5231 | if (ret) |
5232 | return IO_APOLL_READY; | |
5233 | return IO_APOLL_ABORTED; | |
d7718a9d JA |
5234 | } |
5235 | spin_unlock_irq(&ctx->completion_lock); | |
236daeae OL |
5236 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5237 | mask, apoll->poll.events); | |
59b735ae | 5238 | return IO_APOLL_OK; |
d7718a9d JA |
5239 | } |
5240 | ||
5241 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5242 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5243 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5244 | { |
b41e9852 | 5245 | bool do_complete = false; |
221c5eb2 | 5246 | |
5082620f JA |
5247 | if (!poll->head) |
5248 | return false; | |
221c5eb2 | 5249 | spin_lock(&poll->head->lock); |
b2e720ac JA |
5250 | if (do_cancel) |
5251 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5252 | if (!list_empty(&poll->wait.entry)) { |
5253 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5254 | do_complete = true; |
221c5eb2 JA |
5255 | } |
5256 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5257 | hash_del(&req->hash_node); |
d7718a9d JA |
5258 | return do_complete; |
5259 | } | |
5260 | ||
b2c3f7e1 | 5261 | static bool io_poll_remove_waitqs(struct io_kiocb *req) |
e07785b0 | 5262 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5263 | { |
5264 | bool do_complete; | |
5265 | ||
d4e7cd36 | 5266 | io_poll_remove_double(req); |
e31001a3 | 5267 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5268 | |
e31001a3 | 5269 | if (req->opcode != IORING_OP_POLL_ADD && do_complete) { |
d7718a9d | 5270 | /* non-poll requests have submit ref still */ |
e31001a3 | 5271 | req_ref_put(req); |
b1f573bd | 5272 | } |
b2c3f7e1 JA |
5273 | return do_complete; |
5274 | } | |
5275 | ||
5276 | static bool io_poll_remove_one(struct io_kiocb *req) | |
e07785b0 | 5277 | __must_hold(&req->ctx->completion_lock) |
b2c3f7e1 JA |
5278 | { |
5279 | bool do_complete; | |
b1f573bd | 5280 | |
b2c3f7e1 | 5281 | do_complete = io_poll_remove_waitqs(req); |
b41e9852 | 5282 | if (do_complete) { |
d4d19c19 | 5283 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5284 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5285 | req_set_fail(req); |
216578e5 | 5286 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5287 | } |
5288 | ||
5289 | return do_complete; | |
221c5eb2 JA |
5290 | } |
5291 | ||
76e1b642 JA |
5292 | /* |
5293 | * Returns true if we found and killed one or more poll requests | |
5294 | */ | |
6b81928d | 5295 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5296 | bool cancel_all) |
221c5eb2 | 5297 | { |
78076bb6 | 5298 | struct hlist_node *tmp; |
221c5eb2 | 5299 | struct io_kiocb *req; |
8e2e1faf | 5300 | int posted = 0, i; |
221c5eb2 JA |
5301 | |
5302 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5303 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5304 | struct hlist_head *list; | |
5305 | ||
5306 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5307 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5308 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5309 | posted += io_poll_remove_one(req); |
5310 | } | |
221c5eb2 JA |
5311 | } |
5312 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5313 | |
8e2e1faf JA |
5314 | if (posted) |
5315 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5316 | |
5317 | return posted != 0; | |
221c5eb2 JA |
5318 | } |
5319 | ||
9ba5fac8 PB |
5320 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5321 | bool poll_only) | |
e07785b0 | 5322 | __must_hold(&ctx->completion_lock) |
47f46768 | 5323 | { |
78076bb6 | 5324 | struct hlist_head *list; |
47f46768 JA |
5325 | struct io_kiocb *req; |
5326 | ||
78076bb6 JA |
5327 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5328 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5329 | if (sqe_addr != req->user_data) |
5330 | continue; | |
9ba5fac8 PB |
5331 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5332 | continue; | |
b2cb805f | 5333 | return req; |
47f46768 | 5334 | } |
b2cb805f JA |
5335 | return NULL; |
5336 | } | |
5337 | ||
9ba5fac8 PB |
5338 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5339 | bool poll_only) | |
e07785b0 | 5340 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5341 | { |
5342 | struct io_kiocb *req; | |
5343 | ||
9ba5fac8 | 5344 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5345 | if (!req) |
5346 | return -ENOENT; | |
5347 | if (io_poll_remove_one(req)) | |
5348 | return 0; | |
5349 | ||
5350 | return -EALREADY; | |
47f46768 JA |
5351 | } |
5352 | ||
9096af3e PB |
5353 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5354 | unsigned int flags) | |
5355 | { | |
5356 | u32 events; | |
47f46768 | 5357 | |
9096af3e PB |
5358 | events = READ_ONCE(sqe->poll32_events); |
5359 | #ifdef __BIG_ENDIAN | |
5360 | events = swahw32(events); | |
5361 | #endif | |
5362 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5363 | events |= EPOLLONESHOT; | |
5364 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5365 | } |
5366 | ||
c5de0036 | 5367 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5368 | const struct io_uring_sqe *sqe) |
0969e783 | 5369 | { |
c5de0036 PB |
5370 | struct io_poll_update *upd = &req->poll_update; |
5371 | u32 flags; | |
5372 | ||
0969e783 JA |
5373 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5374 | return -EINVAL; | |
c5de0036 PB |
5375 | if (sqe->ioprio || sqe->buf_index) |
5376 | return -EINVAL; | |
5377 | flags = READ_ONCE(sqe->len); | |
5378 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5379 | IORING_POLL_ADD_MULTI)) | |
5380 | return -EINVAL; | |
5381 | /* meaningless without update */ | |
5382 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5383 | return -EINVAL; |
5384 | ||
c5de0036 PB |
5385 | upd->old_user_data = READ_ONCE(sqe->addr); |
5386 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5387 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5388 | |
c5de0036 PB |
5389 | upd->new_user_data = READ_ONCE(sqe->off); |
5390 | if (!upd->update_user_data && upd->new_user_data) | |
5391 | return -EINVAL; | |
5392 | if (upd->update_events) | |
5393 | upd->events = io_poll_parse_events(sqe, flags); | |
5394 | else if (sqe->poll32_events) | |
5395 | return -EINVAL; | |
221c5eb2 | 5396 | |
221c5eb2 JA |
5397 | return 0; |
5398 | } | |
5399 | ||
221c5eb2 JA |
5400 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5401 | void *key) | |
5402 | { | |
c2f2eb7d JA |
5403 | struct io_kiocb *req = wait->private; |
5404 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5405 | |
d7718a9d | 5406 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5407 | } |
5408 | ||
221c5eb2 JA |
5409 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5410 | struct poll_table_struct *p) | |
5411 | { | |
5412 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5413 | ||
e8c2bc1f | 5414 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5415 | } |
5416 | ||
3529d8c2 | 5417 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5418 | { |
5419 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5420 | u32 flags; |
221c5eb2 JA |
5421 | |
5422 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5423 | return -EINVAL; | |
c5de0036 | 5424 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5425 | return -EINVAL; |
5426 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5427 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5428 | return -EINVAL; |
5429 | ||
c5de0036 | 5430 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5431 | return 0; |
5432 | } | |
5433 | ||
61e98203 | 5434 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5435 | { |
5436 | struct io_poll_iocb *poll = &req->poll; | |
5437 | struct io_ring_ctx *ctx = req->ctx; | |
5438 | struct io_poll_table ipt; | |
0969e783 | 5439 | __poll_t mask; |
0969e783 | 5440 | |
d7718a9d | 5441 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5442 | |
d7718a9d JA |
5443 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5444 | io_poll_wake); | |
221c5eb2 | 5445 | |
8c838788 | 5446 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5447 | ipt.error = 0; |
e27414be | 5448 | io_poll_complete(req, mask); |
221c5eb2 | 5449 | } |
221c5eb2 JA |
5450 | spin_unlock_irq(&ctx->completion_lock); |
5451 | ||
8c838788 JA |
5452 | if (mask) { |
5453 | io_cqring_ev_posted(ctx); | |
88e41cf9 JA |
5454 | if (poll->events & EPOLLONESHOT) |
5455 | io_put_req(req); | |
221c5eb2 | 5456 | } |
8c838788 | 5457 | return ipt.error; |
221c5eb2 JA |
5458 | } |
5459 | ||
c5de0036 | 5460 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5461 | { |
5462 | struct io_ring_ctx *ctx = req->ctx; | |
5463 | struct io_kiocb *preq; | |
cb3b200e | 5464 | bool completing; |
b69de288 JA |
5465 | int ret; |
5466 | ||
5467 | spin_lock_irq(&ctx->completion_lock); | |
9ba5fac8 | 5468 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5469 | if (!preq) { |
5470 | ret = -ENOENT; | |
5471 | goto err; | |
b69de288 | 5472 | } |
cb3b200e | 5473 | |
c5de0036 PB |
5474 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5475 | completing = true; | |
5476 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5477 | goto err; | |
5478 | } | |
5479 | ||
cb3b200e JA |
5480 | /* |
5481 | * Don't allow racy completion with singleshot, as we cannot safely | |
5482 | * update those. For multishot, if we're racing with completion, just | |
5483 | * let completion re-add it. | |
5484 | */ | |
5485 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5486 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5487 | ret = -EALREADY; | |
5488 | goto err; | |
b69de288 JA |
5489 | } |
5490 | /* we now have a detached poll request. reissue. */ | |
5491 | ret = 0; | |
5492 | err: | |
b69de288 | 5493 | if (ret < 0) { |
cb3b200e | 5494 | spin_unlock_irq(&ctx->completion_lock); |
93d2bcd2 | 5495 | req_set_fail(req); |
b69de288 JA |
5496 | io_req_complete(req, ret); |
5497 | return 0; | |
5498 | } | |
5499 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5500 | if (req->poll_update.update_events) { |
b69de288 | 5501 | preq->poll.events &= ~0xffff; |
9d805892 | 5502 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5503 | preq->poll.events |= IO_POLL_UNMASK; |
5504 | } | |
9d805892 PB |
5505 | if (req->poll_update.update_user_data) |
5506 | preq->user_data = req->poll_update.new_user_data; | |
cb3b200e JA |
5507 | spin_unlock_irq(&ctx->completion_lock); |
5508 | ||
b69de288 JA |
5509 | /* complete update request, we're done with it */ |
5510 | io_req_complete(req, ret); | |
5511 | ||
cb3b200e | 5512 | if (!completing) { |
c5de0036 | 5513 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5514 | if (ret < 0) { |
93d2bcd2 | 5515 | req_set_fail(preq); |
cb3b200e JA |
5516 | io_req_complete(preq, ret); |
5517 | } | |
b69de288 JA |
5518 | } |
5519 | return 0; | |
5520 | } | |
5521 | ||
5262f567 JA |
5522 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5523 | { | |
ad8a48ac JA |
5524 | struct io_timeout_data *data = container_of(timer, |
5525 | struct io_timeout_data, timer); | |
5526 | struct io_kiocb *req = data->req; | |
5527 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5528 | unsigned long flags; |
5529 | ||
5262f567 | 5530 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5531 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5532 | atomic_set(&req->ctx->cq_timeouts, |
5533 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5534 | ||
d4d19c19 | 5535 | io_cqring_fill_event(ctx, req->user_data, -ETIME, 0); |
5262f567 JA |
5536 | io_commit_cqring(ctx); |
5537 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5538 | ||
5539 | io_cqring_ev_posted(ctx); | |
93d2bcd2 | 5540 | req_set_fail(req); |
5262f567 JA |
5541 | io_put_req(req); |
5542 | return HRTIMER_NORESTART; | |
5543 | } | |
5544 | ||
fbd15848 PB |
5545 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5546 | __u64 user_data) | |
e07785b0 | 5547 | __must_hold(&ctx->completion_lock) |
f254ac04 | 5548 | { |
fbd15848 | 5549 | struct io_timeout_data *io; |
47f46768 | 5550 | struct io_kiocb *req; |
fd9c7bc5 | 5551 | bool found = false; |
f254ac04 | 5552 | |
135fcde8 | 5553 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5554 | found = user_data == req->user_data; |
5555 | if (found) | |
47f46768 | 5556 | break; |
47f46768 | 5557 | } |
fd9c7bc5 PB |
5558 | if (!found) |
5559 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5560 | |
5561 | io = req->async_data; | |
fd9c7bc5 | 5562 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5563 | return ERR_PTR(-EALREADY); |
a71976f3 | 5564 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5565 | return req; |
5566 | } | |
47f46768 | 5567 | |
fbd15848 | 5568 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
e07785b0 | 5569 | __must_hold(&ctx->completion_lock) |
fbd15848 PB |
5570 | { |
5571 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5572 | ||
5573 | if (IS_ERR(req)) | |
5574 | return PTR_ERR(req); | |
f254ac04 | 5575 | |
93d2bcd2 | 5576 | req_set_fail(req); |
d4d19c19 | 5577 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
216578e5 | 5578 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5579 | return 0; |
5580 | } | |
5581 | ||
9c8e11b3 PB |
5582 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5583 | struct timespec64 *ts, enum hrtimer_mode mode) | |
e07785b0 | 5584 | __must_hold(&ctx->completion_lock) |
47f46768 | 5585 | { |
9c8e11b3 PB |
5586 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5587 | struct io_timeout_data *data; | |
47f46768 | 5588 | |
9c8e11b3 PB |
5589 | if (IS_ERR(req)) |
5590 | return PTR_ERR(req); | |
47f46768 | 5591 | |
9c8e11b3 PB |
5592 | req->timeout.off = 0; /* noseq */ |
5593 | data = req->async_data; | |
5594 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5595 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5596 | data->timer.function = io_timeout_fn; | |
5597 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5598 | return 0; | |
47f46768 JA |
5599 | } |
5600 | ||
3529d8c2 JA |
5601 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5602 | const struct io_uring_sqe *sqe) | |
b29472ee | 5603 | { |
9c8e11b3 PB |
5604 | struct io_timeout_rem *tr = &req->timeout_rem; |
5605 | ||
b29472ee JA |
5606 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5607 | return -EINVAL; | |
61710e43 DA |
5608 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5609 | return -EINVAL; | |
9c8e11b3 | 5610 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5611 | return -EINVAL; |
5612 | ||
9c8e11b3 PB |
5613 | tr->addr = READ_ONCE(sqe->addr); |
5614 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5615 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5616 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5617 | return -EINVAL; | |
5618 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5619 | return -EFAULT; | |
5620 | } else if (tr->flags) { | |
5621 | /* timeout removal doesn't support flags */ | |
b29472ee | 5622 | return -EINVAL; |
9c8e11b3 | 5623 | } |
b29472ee | 5624 | |
b29472ee JA |
5625 | return 0; |
5626 | } | |
5627 | ||
8662daec PB |
5628 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5629 | { | |
5630 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5631 | : HRTIMER_MODE_REL; | |
5632 | } | |
5633 | ||
11365043 JA |
5634 | /* |
5635 | * Remove or update an existing timeout command | |
5636 | */ | |
61e98203 | 5637 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5638 | { |
9c8e11b3 | 5639 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5640 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5641 | int ret; |
11365043 | 5642 | |
11365043 | 5643 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5644 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5645 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5646 | else |
5647 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5648 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5649 | |
d4d19c19 | 5650 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
11365043 JA |
5651 | io_commit_cqring(ctx); |
5652 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5653 | io_cqring_ev_posted(ctx); |
4e88d6e7 | 5654 | if (ret < 0) |
93d2bcd2 | 5655 | req_set_fail(req); |
ec9c02ad | 5656 | io_put_req(req); |
11365043 | 5657 | return 0; |
5262f567 JA |
5658 | } |
5659 | ||
3529d8c2 | 5660 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5661 | bool is_timeout_link) |
5262f567 | 5662 | { |
ad8a48ac | 5663 | struct io_timeout_data *data; |
a41525ab | 5664 | unsigned flags; |
56080b02 | 5665 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5666 | |
ad8a48ac | 5667 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5668 | return -EINVAL; |
ad8a48ac | 5669 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5670 | return -EINVAL; |
56080b02 | 5671 | if (off && is_timeout_link) |
2d28390a | 5672 | return -EINVAL; |
a41525ab JA |
5673 | flags = READ_ONCE(sqe->timeout_flags); |
5674 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5675 | return -EINVAL; |
bdf20073 | 5676 | |
bfe68a22 | 5677 | req->timeout.off = off; |
f18ee4cf PB |
5678 | if (unlikely(off && !req->ctx->off_timeout_used)) |
5679 | req->ctx->off_timeout_used = true; | |
26a61679 | 5680 | |
e8c2bc1f | 5681 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5682 | return -ENOMEM; |
5683 | ||
e8c2bc1f | 5684 | data = req->async_data; |
ad8a48ac | 5685 | data->req = req; |
ad8a48ac JA |
5686 | |
5687 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5688 | return -EFAULT; |
5689 | ||
8662daec | 5690 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac | 5691 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
2482b58f PB |
5692 | if (is_timeout_link) |
5693 | io_req_track_inflight(req); | |
ad8a48ac JA |
5694 | return 0; |
5695 | } | |
5696 | ||
61e98203 | 5697 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5698 | { |
ad8a48ac | 5699 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5700 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5701 | struct list_head *entry; |
bfe68a22 | 5702 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5703 | |
733f5c95 | 5704 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5705 | |
5262f567 JA |
5706 | /* |
5707 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5708 | * timeout event to be satisfied. If it isn't set, then this is |
5709 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5710 | */ |
8eb7e2d0 | 5711 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5712 | entry = ctx->timeout_list.prev; |
5713 | goto add; | |
5714 | } | |
5262f567 | 5715 | |
bfe68a22 PB |
5716 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5717 | req->timeout.target_seq = tail + off; | |
5262f567 | 5718 | |
f010505b MDG |
5719 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5720 | * This is safe because ->completion_lock is held, and submissions | |
5721 | * and completions are never mixed in the same ->completion_lock section. | |
5722 | */ | |
5723 | ctx->cq_last_tm_flush = tail; | |
5724 | ||
5262f567 JA |
5725 | /* |
5726 | * Insertion sort, ensuring the first entry in the list is always | |
5727 | * the one we need first. | |
5728 | */ | |
5262f567 | 5729 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5730 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5731 | timeout.list); | |
5262f567 | 5732 | |
8eb7e2d0 | 5733 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5734 | continue; |
bfe68a22 PB |
5735 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5736 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5737 | break; |
5738 | } | |
93bd25bb | 5739 | add: |
135fcde8 | 5740 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5741 | data->timer.function = io_timeout_fn; |
5742 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5743 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5744 | return 0; |
5745 | } | |
5262f567 | 5746 | |
f458dd84 PB |
5747 | struct io_cancel_data { |
5748 | struct io_ring_ctx *ctx; | |
5749 | u64 user_data; | |
5750 | }; | |
5751 | ||
62755e35 JA |
5752 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5753 | { | |
5754 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 5755 | struct io_cancel_data *cd = data; |
62755e35 | 5756 | |
f458dd84 | 5757 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
5758 | } |
5759 | ||
f458dd84 PB |
5760 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
5761 | struct io_ring_ctx *ctx) | |
62755e35 | 5762 | { |
f458dd84 | 5763 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 5764 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5765 | int ret = 0; |
5766 | ||
f458dd84 | 5767 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
5768 | return -ENOENT; |
5769 | ||
f458dd84 | 5770 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
5771 | switch (cancel_ret) { |
5772 | case IO_WQ_CANCEL_OK: | |
5773 | ret = 0; | |
5774 | break; | |
5775 | case IO_WQ_CANCEL_RUNNING: | |
5776 | ret = -EALREADY; | |
5777 | break; | |
5778 | case IO_WQ_CANCEL_NOTFOUND: | |
5779 | ret = -ENOENT; | |
5780 | break; | |
5781 | } | |
5782 | ||
e977d6d3 JA |
5783 | return ret; |
5784 | } | |
5785 | ||
47f46768 JA |
5786 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5787 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5788 | int success_ret) |
47f46768 JA |
5789 | { |
5790 | unsigned long flags; | |
5791 | int ret; | |
5792 | ||
f458dd84 | 5793 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
47f46768 | 5794 | spin_lock_irqsave(&ctx->completion_lock, flags); |
df9727af PB |
5795 | if (ret != -ENOENT) |
5796 | goto done; | |
47f46768 JA |
5797 | ret = io_timeout_cancel(ctx, sqe_addr); |
5798 | if (ret != -ENOENT) | |
5799 | goto done; | |
9ba5fac8 | 5800 | ret = io_poll_cancel(ctx, sqe_addr, false); |
47f46768 | 5801 | done: |
b0dd8a41 JA |
5802 | if (!ret) |
5803 | ret = success_ret; | |
d4d19c19 | 5804 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
47f46768 JA |
5805 | io_commit_cqring(ctx); |
5806 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5807 | io_cqring_ev_posted(ctx); | |
5808 | ||
4e88d6e7 | 5809 | if (ret < 0) |
93d2bcd2 | 5810 | req_set_fail(req); |
47f46768 JA |
5811 | } |
5812 | ||
3529d8c2 JA |
5813 | static int io_async_cancel_prep(struct io_kiocb *req, |
5814 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5815 | { |
fbf23849 | 5816 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5817 | return -EINVAL; |
61710e43 DA |
5818 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5819 | return -EINVAL; | |
5820 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5821 | return -EINVAL; |
5822 | ||
fbf23849 JA |
5823 | req->cancel.addr = READ_ONCE(sqe->addr); |
5824 | return 0; | |
5825 | } | |
5826 | ||
61e98203 | 5827 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5828 | { |
5829 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
5830 | u64 sqe_addr = req->cancel.addr; |
5831 | struct io_tctx_node *node; | |
5832 | int ret; | |
5833 | ||
5834 | /* tasks should wait for their io-wq threads, so safe w/o sync */ | |
5835 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); | |
5836 | spin_lock_irq(&ctx->completion_lock); | |
5837 | if (ret != -ENOENT) | |
5838 | goto done; | |
5839 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5840 | if (ret != -ENOENT) | |
5841 | goto done; | |
9ba5fac8 | 5842 | ret = io_poll_cancel(ctx, sqe_addr, false); |
58f99373 PB |
5843 | if (ret != -ENOENT) |
5844 | goto done; | |
5845 | spin_unlock_irq(&ctx->completion_lock); | |
5846 | ||
5847 | /* slow path, try all io-wq's */ | |
5848 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5849 | ret = -ENOENT; | |
5850 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
5851 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 5852 | |
58f99373 PB |
5853 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
5854 | if (ret != -ENOENT) | |
5855 | break; | |
5856 | } | |
5857 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5858 | ||
5859 | spin_lock_irq(&ctx->completion_lock); | |
5860 | done: | |
d4d19c19 | 5861 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
58f99373 PB |
5862 | io_commit_cqring(ctx); |
5863 | spin_unlock_irq(&ctx->completion_lock); | |
5864 | io_cqring_ev_posted(ctx); | |
5865 | ||
5866 | if (ret < 0) | |
93d2bcd2 | 5867 | req_set_fail(req); |
58f99373 | 5868 | io_put_req(req); |
5262f567 JA |
5869 | return 0; |
5870 | } | |
5871 | ||
269bbe5f | 5872 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
5873 | const struct io_uring_sqe *sqe) |
5874 | { | |
61710e43 DA |
5875 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5876 | return -EINVAL; | |
5877 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5878 | return -EINVAL; |
5879 | ||
269bbe5f BM |
5880 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
5881 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
5882 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 5883 | return -EINVAL; |
269bbe5f | 5884 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
5885 | return 0; |
5886 | } | |
5887 | ||
889fca73 | 5888 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5889 | { |
5890 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 5891 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 5892 | int ret; |
fbf23849 | 5893 | |
45d189c6 | 5894 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 5895 | return -EAGAIN; |
05f3fb3c | 5896 | |
269bbe5f BM |
5897 | up.offset = req->rsrc_update.offset; |
5898 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
5899 | up.nr = 0; |
5900 | up.tags = 0; | |
615cee49 | 5901 | up.resv = 0; |
05f3fb3c JA |
5902 | |
5903 | mutex_lock(&ctx->uring_lock); | |
fdecb662 | 5904 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 5905 | &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
5906 | mutex_unlock(&ctx->uring_lock); |
5907 | ||
5908 | if (ret < 0) | |
93d2bcd2 | 5909 | req_set_fail(req); |
889fca73 | 5910 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
5911 | return 0; |
5912 | } | |
5913 | ||
bfe76559 | 5914 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5915 | { |
d625c6ee | 5916 | switch (req->opcode) { |
e781573e | 5917 | case IORING_OP_NOP: |
bfe76559 | 5918 | return 0; |
f67676d1 JA |
5919 | case IORING_OP_READV: |
5920 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5921 | case IORING_OP_READ: |
bfe76559 | 5922 | return io_read_prep(req, sqe); |
f67676d1 JA |
5923 | case IORING_OP_WRITEV: |
5924 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5925 | case IORING_OP_WRITE: |
bfe76559 | 5926 | return io_write_prep(req, sqe); |
0969e783 | 5927 | case IORING_OP_POLL_ADD: |
bfe76559 | 5928 | return io_poll_add_prep(req, sqe); |
0969e783 | 5929 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 5930 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 5931 | case IORING_OP_FSYNC: |
1155c76a | 5932 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 5933 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 5934 | return io_sfr_prep(req, sqe); |
03b1230c | 5935 | case IORING_OP_SENDMSG: |
fddaface | 5936 | case IORING_OP_SEND: |
bfe76559 | 5937 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5938 | case IORING_OP_RECVMSG: |
fddaface | 5939 | case IORING_OP_RECV: |
bfe76559 | 5940 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5941 | case IORING_OP_CONNECT: |
bfe76559 | 5942 | return io_connect_prep(req, sqe); |
2d28390a | 5943 | case IORING_OP_TIMEOUT: |
bfe76559 | 5944 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5945 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5946 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5947 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5948 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5949 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5950 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5951 | case IORING_OP_ACCEPT: |
bfe76559 | 5952 | return io_accept_prep(req, sqe); |
d63d1b5e | 5953 | case IORING_OP_FALLOCATE: |
bfe76559 | 5954 | return io_fallocate_prep(req, sqe); |
15b71abe | 5955 | case IORING_OP_OPENAT: |
bfe76559 | 5956 | return io_openat_prep(req, sqe); |
b5dba59e | 5957 | case IORING_OP_CLOSE: |
bfe76559 | 5958 | return io_close_prep(req, sqe); |
05f3fb3c | 5959 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 5960 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 5961 | case IORING_OP_STATX: |
bfe76559 | 5962 | return io_statx_prep(req, sqe); |
4840e418 | 5963 | case IORING_OP_FADVISE: |
bfe76559 | 5964 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5965 | case IORING_OP_MADVISE: |
bfe76559 | 5966 | return io_madvise_prep(req, sqe); |
cebdb986 | 5967 | case IORING_OP_OPENAT2: |
bfe76559 | 5968 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5969 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5970 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5971 | case IORING_OP_SPLICE: |
bfe76559 | 5972 | return io_splice_prep(req, sqe); |
ddf0322d | 5973 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5974 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5975 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5976 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5977 | case IORING_OP_TEE: |
bfe76559 | 5978 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5979 | case IORING_OP_SHUTDOWN: |
5980 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5981 | case IORING_OP_RENAMEAT: |
5982 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5983 | case IORING_OP_UNLINKAT: |
5984 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5985 | } |
5986 | ||
bfe76559 PB |
5987 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5988 | req->opcode); | |
bd54b6fe | 5989 | return -EINVAL; |
bfe76559 PB |
5990 | } |
5991 | ||
93642ef8 | 5992 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 5993 | { |
b7e298d2 PB |
5994 | if (!io_op_defs[req->opcode].needs_async_setup) |
5995 | return 0; | |
5996 | if (WARN_ON_ONCE(req->async_data)) | |
5997 | return -EFAULT; | |
5998 | if (io_alloc_async_data(req)) | |
5999 | return -EAGAIN; | |
6000 | ||
93642ef8 PB |
6001 | switch (req->opcode) { |
6002 | case IORING_OP_READV: | |
93642ef8 PB |
6003 | return io_rw_prep_async(req, READ); |
6004 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6005 | return io_rw_prep_async(req, WRITE); |
6006 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6007 | return io_sendmsg_prep_async(req); |
6008 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6009 | return io_recvmsg_prep_async(req); |
6010 | case IORING_OP_CONNECT: | |
6011 | return io_connect_prep_async(req); | |
6012 | } | |
b7e298d2 PB |
6013 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6014 | req->opcode); | |
6015 | return -EFAULT; | |
f67676d1 JA |
6016 | } |
6017 | ||
9cf7c104 PB |
6018 | static u32 io_get_sequence(struct io_kiocb *req) |
6019 | { | |
a3dbdf54 | 6020 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6021 | |
a3dbdf54 PB |
6022 | /* need original cached_sq_head, but it was increased for each req */ |
6023 | io_for_each_link(req, req) | |
6024 | seq--; | |
6025 | return seq; | |
9cf7c104 PB |
6026 | } |
6027 | ||
76cc33d7 | 6028 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6029 | { |
3c19966d | 6030 | struct io_kiocb *pos; |
a197f664 | 6031 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6032 | struct io_defer_entry *de; |
f67676d1 | 6033 | int ret; |
9cf7c104 | 6034 | u32 seq; |
de0617e4 | 6035 | |
3c19966d PB |
6036 | /* |
6037 | * If we need to drain a request in the middle of a link, drain the | |
6038 | * head request and the next request/link after the current link. | |
6039 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6040 | * maintained for every request of our link. | |
6041 | */ | |
6042 | if (ctx->drain_next) { | |
6043 | req->flags |= REQ_F_IO_DRAIN; | |
6044 | ctx->drain_next = false; | |
6045 | } | |
6046 | /* not interested in head, start from the first linked */ | |
6047 | io_for_each_link(pos, req->link) { | |
6048 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6049 | ctx->drain_next = true; | |
6050 | req->flags |= REQ_F_IO_DRAIN; | |
6051 | break; | |
6052 | } | |
6053 | } | |
6054 | ||
9d858b21 | 6055 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6056 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6057 | !(req->flags & REQ_F_IO_DRAIN))) { |
6058 | ctx->drain_active = false; | |
76cc33d7 | 6059 | return false; |
10c66904 | 6060 | } |
9cf7c104 PB |
6061 | |
6062 | seq = io_get_sequence(req); | |
6063 | /* Still a chance to pass the sequence check */ | |
6064 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6065 | return false; |
de0617e4 | 6066 | |
b7e298d2 | 6067 | ret = io_req_prep_async(req); |
be7053b7 | 6068 | if (ret) |
1b48773f | 6069 | goto fail; |
cbdcb435 | 6070 | io_prep_async_link(req); |
27dc8338 | 6071 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6072 | if (!de) { |
1b48773f PB |
6073 | ret = -ENOMEM; |
6074 | fail: | |
6075 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6076 | return true; |
6077 | } | |
2d28390a | 6078 | |
de0617e4 | 6079 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6080 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6081 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6082 | kfree(de); |
ae34817b | 6083 | io_queue_async_work(req); |
76cc33d7 | 6084 | return true; |
de0617e4 JA |
6085 | } |
6086 | ||
915967f6 | 6087 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6088 | de->req = req; |
9cf7c104 | 6089 | de->seq = seq; |
27dc8338 | 6090 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 | 6091 | spin_unlock_irq(&ctx->completion_lock); |
76cc33d7 | 6092 | return true; |
de0617e4 JA |
6093 | } |
6094 | ||
68fb8979 | 6095 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6096 | { |
0e1b6fe3 PB |
6097 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6098 | switch (req->opcode) { | |
6099 | case IORING_OP_READV: | |
6100 | case IORING_OP_READ_FIXED: | |
6101 | case IORING_OP_READ: | |
bcda7baa | 6102 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6103 | break; |
6104 | case IORING_OP_RECVMSG: | |
6105 | case IORING_OP_RECV: | |
bcda7baa | 6106 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6107 | break; |
6108 | } | |
99bc4c38 PB |
6109 | } |
6110 | ||
0e1b6fe3 PB |
6111 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6112 | switch (req->opcode) { | |
6113 | case IORING_OP_READV: | |
6114 | case IORING_OP_READ_FIXED: | |
6115 | case IORING_OP_READ: | |
6116 | case IORING_OP_WRITEV: | |
6117 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6118 | case IORING_OP_WRITE: { |
6119 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6120 | |
6121 | kfree(io->free_iovec); | |
0e1b6fe3 | 6122 | break; |
e8c2bc1f | 6123 | } |
0e1b6fe3 | 6124 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6125 | case IORING_OP_SENDMSG: { |
6126 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6127 | |
6128 | kfree(io->free_iov); | |
0e1b6fe3 | 6129 | break; |
e8c2bc1f | 6130 | } |
0e1b6fe3 PB |
6131 | case IORING_OP_SPLICE: |
6132 | case IORING_OP_TEE: | |
e1d767f0 PB |
6133 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6134 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6135 | break; |
f3cd4850 JA |
6136 | case IORING_OP_OPENAT: |
6137 | case IORING_OP_OPENAT2: | |
6138 | if (req->open.filename) | |
6139 | putname(req->open.filename); | |
6140 | break; | |
80a261fd JA |
6141 | case IORING_OP_RENAMEAT: |
6142 | putname(req->rename.oldpath); | |
6143 | putname(req->rename.newpath); | |
6144 | break; | |
14a1143b JA |
6145 | case IORING_OP_UNLINKAT: |
6146 | putname(req->unlink.filename); | |
6147 | break; | |
0e1b6fe3 | 6148 | } |
99bc4c38 | 6149 | } |
75652a30 JA |
6150 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6151 | kfree(req->apoll->double_poll); | |
6152 | kfree(req->apoll); | |
6153 | req->apoll = NULL; | |
6154 | } | |
3a0a6902 PB |
6155 | if (req->flags & REQ_F_INFLIGHT) { |
6156 | struct io_uring_task *tctx = req->task->io_uring; | |
6157 | ||
6158 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6159 | } |
c854357b | 6160 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6161 | put_cred(req->creds); |
c854357b PB |
6162 | |
6163 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6164 | } |
6165 | ||
889fca73 | 6166 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6167 | { |
a197f664 | 6168 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6169 | const struct cred *creds = NULL; |
d625c6ee | 6170 | int ret; |
2b188cc1 | 6171 | |
b8e64b53 | 6172 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6173 | creds = override_creds(req->creds); |
5730b27e | 6174 | |
d625c6ee | 6175 | switch (req->opcode) { |
2b188cc1 | 6176 | case IORING_OP_NOP: |
889fca73 | 6177 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6178 | break; |
6179 | case IORING_OP_READV: | |
edafccee | 6180 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6181 | case IORING_OP_READ: |
889fca73 | 6182 | ret = io_read(req, issue_flags); |
edafccee | 6183 | break; |
3529d8c2 | 6184 | case IORING_OP_WRITEV: |
edafccee | 6185 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6186 | case IORING_OP_WRITE: |
889fca73 | 6187 | ret = io_write(req, issue_flags); |
2b188cc1 | 6188 | break; |
c992fe29 | 6189 | case IORING_OP_FSYNC: |
45d189c6 | 6190 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6191 | break; |
221c5eb2 | 6192 | case IORING_OP_POLL_ADD: |
61e98203 | 6193 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6194 | break; |
6195 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6196 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6197 | break; |
5d17b4a4 | 6198 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6199 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6200 | break; |
0fa03c62 | 6201 | case IORING_OP_SENDMSG: |
889fca73 | 6202 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6203 | break; |
fddaface | 6204 | case IORING_OP_SEND: |
889fca73 | 6205 | ret = io_send(req, issue_flags); |
0fa03c62 | 6206 | break; |
aa1fa28f | 6207 | case IORING_OP_RECVMSG: |
889fca73 | 6208 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6209 | break; |
fddaface | 6210 | case IORING_OP_RECV: |
889fca73 | 6211 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6212 | break; |
5262f567 | 6213 | case IORING_OP_TIMEOUT: |
61e98203 | 6214 | ret = io_timeout(req, issue_flags); |
5262f567 | 6215 | break; |
11365043 | 6216 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6217 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6218 | break; |
17f2fe35 | 6219 | case IORING_OP_ACCEPT: |
889fca73 | 6220 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6221 | break; |
f8e85cf2 | 6222 | case IORING_OP_CONNECT: |
889fca73 | 6223 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6224 | break; |
62755e35 | 6225 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6226 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6227 | break; |
d63d1b5e | 6228 | case IORING_OP_FALLOCATE: |
45d189c6 | 6229 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6230 | break; |
15b71abe | 6231 | case IORING_OP_OPENAT: |
45d189c6 | 6232 | ret = io_openat(req, issue_flags); |
15b71abe | 6233 | break; |
b5dba59e | 6234 | case IORING_OP_CLOSE: |
889fca73 | 6235 | ret = io_close(req, issue_flags); |
b5dba59e | 6236 | break; |
05f3fb3c | 6237 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6238 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6239 | break; |
eddc7ef5 | 6240 | case IORING_OP_STATX: |
45d189c6 | 6241 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6242 | break; |
4840e418 | 6243 | case IORING_OP_FADVISE: |
45d189c6 | 6244 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6245 | break; |
c1ca757b | 6246 | case IORING_OP_MADVISE: |
45d189c6 | 6247 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6248 | break; |
cebdb986 | 6249 | case IORING_OP_OPENAT2: |
45d189c6 | 6250 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6251 | break; |
3e4827b0 | 6252 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6253 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6254 | break; |
7d67af2c | 6255 | case IORING_OP_SPLICE: |
45d189c6 | 6256 | ret = io_splice(req, issue_flags); |
7d67af2c | 6257 | break; |
ddf0322d | 6258 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6259 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6260 | break; |
067524e9 | 6261 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6262 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6263 | break; |
f2a8d5c7 | 6264 | case IORING_OP_TEE: |
45d189c6 | 6265 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6266 | break; |
36f4fa68 | 6267 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6268 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6269 | break; |
80a261fd | 6270 | case IORING_OP_RENAMEAT: |
45d189c6 | 6271 | ret = io_renameat(req, issue_flags); |
80a261fd | 6272 | break; |
14a1143b | 6273 | case IORING_OP_UNLINKAT: |
45d189c6 | 6274 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6275 | break; |
2b188cc1 JA |
6276 | default: |
6277 | ret = -EINVAL; | |
6278 | break; | |
6279 | } | |
6280 | ||
5730b27e JA |
6281 | if (creds) |
6282 | revert_creds(creds); | |
def596e9 JA |
6283 | if (ret) |
6284 | return ret; | |
b532576e | 6285 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6286 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6287 | io_iopoll_req_issued(req); | |
def596e9 JA |
6288 | |
6289 | return 0; | |
2b188cc1 JA |
6290 | } |
6291 | ||
5280f7e5 | 6292 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6293 | { |
6294 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6295 | struct io_kiocb *timeout; |
561fb04a | 6296 | int ret = 0; |
2b188cc1 | 6297 | |
6df1db6b PB |
6298 | timeout = io_prep_linked_timeout(req); |
6299 | if (timeout) | |
6300 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6301 | |
4014d943 | 6302 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6303 | ret = -ECANCELED; |
31b51510 | 6304 | |
561fb04a | 6305 | if (!ret) { |
561fb04a | 6306 | do { |
889fca73 | 6307 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6308 | /* |
6309 | * We can get EAGAIN for polled IO even though we're | |
6310 | * forcing a sync submission from here, since we can't | |
6311 | * wait for request slots on the block side. | |
6312 | */ | |
6313 | if (ret != -EAGAIN) | |
6314 | break; | |
6315 | cond_resched(); | |
6316 | } while (1); | |
6317 | } | |
31b51510 | 6318 | |
a3df7698 | 6319 | /* avoid locking problems by failing it from a clean context */ |
561fb04a | 6320 | if (ret) { |
a3df7698 | 6321 | /* io-wq is going to take one down */ |
de9b4cca | 6322 | req_ref_get(req); |
a3df7698 | 6323 | io_req_task_queue_fail(req, ret); |
edafccee | 6324 | } |
2b188cc1 JA |
6325 | } |
6326 | ||
7b29f92d JA |
6327 | #define FFS_ASYNC_READ 0x1UL |
6328 | #define FFS_ASYNC_WRITE 0x2UL | |
6329 | #ifdef CONFIG_64BIT | |
6330 | #define FFS_ISREG 0x4UL | |
6331 | #else | |
6332 | #define FFS_ISREG 0x0UL | |
6333 | #endif | |
6334 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
6335 | ||
aeca241b | 6336 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
a04b0ac0 | 6337 | unsigned i) |
65e19f54 | 6338 | { |
aeca241b | 6339 | struct io_fixed_file *table_l2; |
65e19f54 | 6340 | |
aeca241b PB |
6341 | table_l2 = table->files[i >> IORING_FILE_TABLE_SHIFT]; |
6342 | return &table_l2[i & IORING_FILE_TABLE_MASK]; | |
dafecf19 PB |
6343 | } |
6344 | ||
65e19f54 JA |
6345 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6346 | int index) | |
6347 | { | |
aeca241b | 6348 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6349 | |
a04b0ac0 | 6350 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6351 | } |
6352 | ||
a04b0ac0 | 6353 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6354 | { |
6355 | unsigned long file_ptr = (unsigned long) file; | |
6356 | ||
6357 | if (__io_file_supports_async(file, READ)) | |
6358 | file_ptr |= FFS_ASYNC_READ; | |
6359 | if (__io_file_supports_async(file, WRITE)) | |
6360 | file_ptr |= FFS_ASYNC_WRITE; | |
6361 | if (S_ISREG(file_inode(file)->i_mode)) | |
6362 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6363 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6364 | } |
6365 | ||
8371adf5 PB |
6366 | static struct file *io_file_get(struct io_submit_state *state, |
6367 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6368 | { |
a197f664 | 6369 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6370 | struct file *file; |
09bb8394 | 6371 | |
8da11c19 | 6372 | if (fixed) { |
7b29f92d JA |
6373 | unsigned long file_ptr; |
6374 | ||
479f517b | 6375 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6376 | return NULL; |
b7620121 | 6377 | fd = array_index_nospec(fd, ctx->nr_user_files); |
aeca241b | 6378 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; |
7b29f92d JA |
6379 | file = (struct file *) (file_ptr & FFS_MASK); |
6380 | file_ptr &= ~FFS_MASK; | |
6381 | /* mask in overlapping REQ_F and FFS bits */ | |
6382 | req->flags |= (file_ptr << REQ_F_ASYNC_READ_BIT); | |
b895c9a6 | 6383 | io_req_set_rsrc_node(req); |
09bb8394 | 6384 | } else { |
c826bd7a | 6385 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6386 | file = __io_file_get(state, fd); |
d44f554e JA |
6387 | |
6388 | /* we don't allow fixed io_uring files */ | |
6389 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6390 | io_req_track_inflight(req); | |
09bb8394 JA |
6391 | } |
6392 | ||
8371adf5 | 6393 | return file; |
09bb8394 JA |
6394 | } |
6395 | ||
2665abfd | 6396 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6397 | { |
ad8a48ac JA |
6398 | struct io_timeout_data *data = container_of(timer, |
6399 | struct io_timeout_data, timer); | |
90cd7e42 | 6400 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6401 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6402 | unsigned long flags; |
2665abfd JA |
6403 | |
6404 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6405 | prev = req->timeout.head; |
6406 | req->timeout.head = NULL; | |
2665abfd JA |
6407 | |
6408 | /* | |
6409 | * We don't expect the list to be empty, that will only happen if we | |
6410 | * race with the completion of the linked work. | |
6411 | */ | |
447c19f3 | 6412 | if (prev) { |
f2f87370 | 6413 | io_remove_next_linked(prev); |
447c19f3 PB |
6414 | if (!req_ref_inc_not_zero(prev)) |
6415 | prev = NULL; | |
6416 | } | |
2665abfd JA |
6417 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6418 | ||
6419 | if (prev) { | |
014db007 | 6420 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6421 | io_put_req_deferred(prev, 1); |
a298232e | 6422 | io_put_req_deferred(req, 1); |
47f46768 | 6423 | } else { |
9ae1f8dd | 6424 | io_req_complete_post(req, -ETIME, 0); |
2665abfd | 6425 | } |
2665abfd JA |
6426 | return HRTIMER_NORESTART; |
6427 | } | |
6428 | ||
de968c18 | 6429 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6430 | { |
de968c18 PB |
6431 | struct io_ring_ctx *ctx = req->ctx; |
6432 | ||
6433 | spin_lock_irq(&ctx->completion_lock); | |
76a46e06 | 6434 | /* |
f2f87370 PB |
6435 | * If the back reference is NULL, then our linked request finished |
6436 | * before we got a chance to setup the timer | |
76a46e06 | 6437 | */ |
90cd7e42 | 6438 | if (req->timeout.head) { |
e8c2bc1f | 6439 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6440 | |
ad8a48ac JA |
6441 | data->timer.function = io_link_timeout_fn; |
6442 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6443 | data->mode); | |
2665abfd | 6444 | } |
76a46e06 | 6445 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6446 | /* drop submission reference */ |
76a46e06 JA |
6447 | io_put_req(req); |
6448 | } | |
2665abfd | 6449 | |
ad8a48ac | 6450 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6451 | { |
f2f87370 | 6452 | struct io_kiocb *nxt = req->link; |
2665abfd | 6453 | |
f2f87370 PB |
6454 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6455 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6456 | return NULL; |
2665abfd | 6457 | |
90cd7e42 | 6458 | nxt->timeout.head = req; |
900fad45 | 6459 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6460 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6461 | return nxt; |
2665abfd JA |
6462 | } |
6463 | ||
c5eef2b9 | 6464 | static void __io_queue_sqe(struct io_kiocb *req) |
2b188cc1 | 6465 | { |
d3d7298d | 6466 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); |
e0c5c576 | 6467 | int ret; |
2b188cc1 | 6468 | |
59b735ae | 6469 | issue_sqe: |
c5eef2b9 | 6470 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6471 | |
491381ce JA |
6472 | /* |
6473 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6474 | * doesn't support non-blocking read/write attempts | |
6475 | */ | |
1840038e | 6476 | if (likely(!ret)) { |
0d63c148 | 6477 | /* drop submission reference */ |
e342c807 | 6478 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6479 | struct io_ring_ctx *ctx = req->ctx; |
6480 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
e65ef56d | 6481 | |
6dd0be1e | 6482 | cs->reqs[cs->nr++] = req; |
d3d7298d | 6483 | if (cs->nr == ARRAY_SIZE(cs->reqs)) |
2a2758f2 | 6484 | io_submit_flush_completions(ctx); |
9affd664 | 6485 | } else { |
d3d7298d | 6486 | io_put_req(req); |
0d63c148 | 6487 | } |
1840038e | 6488 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
59b735ae OL |
6489 | switch (io_arm_poll_handler(req)) { |
6490 | case IO_APOLL_READY: | |
6491 | goto issue_sqe; | |
6492 | case IO_APOLL_ABORTED: | |
1840038e PB |
6493 | /* |
6494 | * Queued up for async execution, worker will release | |
6495 | * submit reference when the iocb is actually submitted. | |
6496 | */ | |
6497 | io_queue_async_work(req); | |
59b735ae | 6498 | break; |
1840038e | 6499 | } |
0d63c148 | 6500 | } else { |
f41db273 | 6501 | io_req_complete_failed(req, ret); |
9e645e11 | 6502 | } |
d3d7298d PB |
6503 | if (linked_timeout) |
6504 | io_queue_linked_timeout(linked_timeout); | |
2b188cc1 JA |
6505 | } |
6506 | ||
441b8a78 | 6507 | static inline void io_queue_sqe(struct io_kiocb *req) |
4fe2c963 | 6508 | { |
10c66904 | 6509 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 6510 | return; |
4fe2c963 | 6511 | |
76cc33d7 | 6512 | if (likely(!(req->flags & REQ_F_FORCE_ASYNC))) { |
c5eef2b9 | 6513 | __io_queue_sqe(req); |
76cc33d7 PB |
6514 | } else { |
6515 | int ret = io_req_prep_async(req); | |
6516 | ||
6517 | if (unlikely(ret)) | |
6518 | io_req_complete_failed(req, ret); | |
6519 | else | |
6520 | io_queue_async_work(req); | |
ce35a47a | 6521 | } |
4fe2c963 JL |
6522 | } |
6523 | ||
b16fed66 PB |
6524 | /* |
6525 | * Check SQE restrictions (opcode and flags). | |
6526 | * | |
6527 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6528 | */ | |
6529 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6530 | struct io_kiocb *req, | |
6531 | unsigned int sqe_flags) | |
4fe2c963 | 6532 | { |
4cfb25bf | 6533 | if (likely(!ctx->restricted)) |
b16fed66 PB |
6534 | return true; |
6535 | ||
6536 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6537 | return false; | |
6538 | ||
6539 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6540 | ctx->restrictions.sqe_flags_required) | |
6541 | return false; | |
6542 | ||
6543 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6544 | ctx->restrictions.sqe_flags_required)) | |
6545 | return false; | |
6546 | ||
6547 | return true; | |
4fe2c963 JL |
6548 | } |
6549 | ||
b16fed66 PB |
6550 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6551 | const struct io_uring_sqe *sqe) | |
6552 | { | |
6553 | struct io_submit_state *state; | |
6554 | unsigned int sqe_flags; | |
003e8dcc | 6555 | int personality, ret = 0; |
b16fed66 PB |
6556 | |
6557 | req->opcode = READ_ONCE(sqe->opcode); | |
6558 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
6559 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
6560 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 6561 | req->file = NULL; |
b16fed66 PB |
6562 | req->fixed_rsrc_refs = NULL; |
6563 | /* one is dropped after submission, the other at completion */ | |
abc54d63 | 6564 | atomic_set(&req->refs, 2); |
b16fed66 | 6565 | req->task = current; |
b16fed66 PB |
6566 | |
6567 | /* enforce forwards compatibility on users */ | |
dddca226 | 6568 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 6569 | return -EINVAL; |
b16fed66 PB |
6570 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
6571 | return -EINVAL; | |
4cfb25bf | 6572 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
6573 | return -EACCES; |
6574 | ||
6575 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6576 | !io_op_defs[req->opcode].buffer_select) | |
6577 | return -EOPNOTSUPP; | |
3c19966d PB |
6578 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
6579 | ctx->drain_active = true; | |
863e0560 | 6580 | |
003e8dcc JA |
6581 | personality = READ_ONCE(sqe->personality); |
6582 | if (personality) { | |
c10d1f98 PB |
6583 | req->creds = xa_load(&ctx->personalities, personality); |
6584 | if (!req->creds) | |
003e8dcc | 6585 | return -EINVAL; |
c10d1f98 | 6586 | get_cred(req->creds); |
b8e64b53 | 6587 | req->flags |= REQ_F_CREDS; |
003e8dcc | 6588 | } |
b16fed66 PB |
6589 | state = &ctx->submit_state; |
6590 | ||
6591 | /* | |
6592 | * Plug now if we have more than 1 IO left after this, and the target | |
6593 | * is potentially a read/write to block based storage. | |
6594 | */ | |
6595 | if (!state->plug_started && state->ios_left > 1 && | |
6596 | io_op_defs[req->opcode].plug) { | |
6597 | blk_start_plug(&state->plug); | |
6598 | state->plug_started = true; | |
6599 | } | |
6600 | ||
6601 | if (io_op_defs[req->opcode].needs_file) { | |
6602 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6603 | ||
6604 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
6605 | if (unlikely(!req->file)) | |
6606 | ret = -EBADF; | |
6607 | } | |
6608 | ||
6609 | state->ios_left--; | |
6610 | return ret; | |
6611 | } | |
6612 | ||
a6b8cadc | 6613 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 6614 | const struct io_uring_sqe *sqe) |
9e645e11 | 6615 | { |
a1ab7b35 | 6616 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 6617 | int ret; |
9e645e11 | 6618 | |
a6b8cadc PB |
6619 | ret = io_init_req(ctx, req, sqe); |
6620 | if (unlikely(ret)) { | |
6621 | fail_req: | |
de59bc10 PB |
6622 | if (link->head) { |
6623 | /* fail even hard links since we don't submit */ | |
93d2bcd2 | 6624 | req_set_fail(link->head); |
f41db273 | 6625 | io_req_complete_failed(link->head, -ECANCELED); |
de59bc10 PB |
6626 | link->head = NULL; |
6627 | } | |
f41db273 | 6628 | io_req_complete_failed(req, ret); |
a6b8cadc PB |
6629 | return ret; |
6630 | } | |
441b8a78 | 6631 | |
be7053b7 PB |
6632 | ret = io_req_prep(req, sqe); |
6633 | if (unlikely(ret)) | |
6634 | goto fail_req; | |
a6b8cadc | 6635 | |
be7053b7 | 6636 | /* don't need @sqe from now on */ |
236daeae OL |
6637 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
6638 | req->flags, true, | |
6639 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 6640 | |
9e645e11 JA |
6641 | /* |
6642 | * If we already have a head request, queue this one for async | |
6643 | * submittal once the head completes. If we don't have a head but | |
6644 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6645 | * submitted sync once the chain is complete. If none of those | |
6646 | * conditions are true (normal request), then just queue it. | |
6647 | */ | |
863e0560 PB |
6648 | if (link->head) { |
6649 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6650 | |
b7e298d2 | 6651 | ret = io_req_prep_async(req); |
cf109604 | 6652 | if (unlikely(ret)) |
a6b8cadc | 6653 | goto fail_req; |
9d76377f | 6654 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6655 | link->last->link = req; |
863e0560 | 6656 | link->last = req; |
32fe525b PB |
6657 | |
6658 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6659 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 6660 | link->head = NULL; |
5e159204 | 6661 | io_queue_sqe(head); |
32fe525b | 6662 | } |
9e645e11 | 6663 | } else { |
ef4ff581 | 6664 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
6665 | link->head = req; |
6666 | link->last = req; | |
711be031 | 6667 | } else { |
be7053b7 | 6668 | io_queue_sqe(req); |
711be031 | 6669 | } |
9e645e11 | 6670 | } |
2e6e1fde | 6671 | |
1d4240cc | 6672 | return 0; |
9e645e11 JA |
6673 | } |
6674 | ||
9a56a232 JA |
6675 | /* |
6676 | * Batched submission is done, ensure local IO is flushed out. | |
6677 | */ | |
ba88ff11 PB |
6678 | static void io_submit_state_end(struct io_submit_state *state, |
6679 | struct io_ring_ctx *ctx) | |
9a56a232 | 6680 | { |
a1ab7b35 | 6681 | if (state->link.head) |
de59bc10 | 6682 | io_queue_sqe(state->link.head); |
6dd0be1e | 6683 | if (state->comp.nr) |
2a2758f2 | 6684 | io_submit_flush_completions(ctx); |
27926b68 JA |
6685 | if (state->plug_started) |
6686 | blk_finish_plug(&state->plug); | |
9f13c35b | 6687 | io_state_file_put(state); |
9a56a232 JA |
6688 | } |
6689 | ||
6690 | /* | |
6691 | * Start submission side cache. | |
6692 | */ | |
6693 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6694 | unsigned int max_ios) |
9a56a232 | 6695 | { |
27926b68 | 6696 | state->plug_started = false; |
9a56a232 | 6697 | state->ios_left = max_ios; |
a1ab7b35 PB |
6698 | /* set only head, no need to init link_last in advance */ |
6699 | state->link.head = NULL; | |
9a56a232 JA |
6700 | } |
6701 | ||
2b188cc1 JA |
6702 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6703 | { | |
75b28aff | 6704 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6705 | |
caf582c6 PB |
6706 | /* |
6707 | * Ensure any loads from the SQEs are done at this point, | |
6708 | * since once we write the new head, the application could | |
6709 | * write new data to them. | |
6710 | */ | |
6711 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6712 | } |
6713 | ||
2b188cc1 | 6714 | /* |
dd9ae8a0 | 6715 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
6716 | * that is mapped by userspace. This means that care needs to be taken to |
6717 | * ensure that reads are stable, as we cannot rely on userspace always | |
6718 | * being a good citizen. If members of the sqe are validated and then later | |
6719 | * used, it's important that those reads are done through READ_ONCE() to | |
6720 | * prevent a re-load down the line. | |
6721 | */ | |
709b302f | 6722 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6723 | { |
ea5ab3b5 | 6724 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 6725 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
6726 | |
6727 | /* | |
6728 | * The cached sq head (or cq tail) serves two purposes: | |
6729 | * | |
6730 | * 1) allows us to batch the cost of updating the user visible | |
6731 | * head updates. | |
6732 | * 2) allows the kernel side to track the head on its own, even | |
6733 | * though the application is the one updating it. | |
6734 | */ | |
17d3aeb3 | 6735 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
6736 | if (likely(head < ctx->sq_entries)) |
6737 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6738 | |
6739 | /* drop invalid entries */ | |
15641e42 PB |
6740 | ctx->cq_extra--; |
6741 | WRITE_ONCE(ctx->rings->sq_dropped, | |
6742 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
6743 | return NULL; |
6744 | } | |
6745 | ||
0f212204 | 6746 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6747 | { |
09899b19 | 6748 | struct io_uring_task *tctx; |
46c4e16a | 6749 | int submitted = 0; |
6c271ce2 | 6750 | |
ee7d46d9 PB |
6751 | /* make sure SQ entry isn't read before tail */ |
6752 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
6753 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6754 | return -EAGAIN; | |
6c271ce2 | 6755 | |
09899b19 PB |
6756 | tctx = current->io_uring; |
6757 | tctx->cached_refs -= nr; | |
6758 | if (unlikely(tctx->cached_refs < 0)) { | |
6759 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
6760 | ||
6761 | percpu_counter_add(&tctx->inflight, refill); | |
6762 | refcount_add(refill, ¤t->usage); | |
6763 | tctx->cached_refs += refill; | |
6764 | } | |
ba88ff11 | 6765 | io_submit_state_start(&ctx->submit_state, nr); |
b14cca0c | 6766 | |
46c4e16a | 6767 | while (submitted < nr) { |
3529d8c2 | 6768 | const struct io_uring_sqe *sqe; |
196be95c | 6769 | struct io_kiocb *req; |
fb5ccc98 | 6770 | |
258b29a9 | 6771 | req = io_alloc_req(ctx); |
196be95c PB |
6772 | if (unlikely(!req)) { |
6773 | if (!submitted) | |
6774 | submitted = -EAGAIN; | |
fb5ccc98 | 6775 | break; |
196be95c | 6776 | } |
4fccfcbb PB |
6777 | sqe = io_get_sqe(ctx); |
6778 | if (unlikely(!sqe)) { | |
6779 | kmem_cache_free(req_cachep, req); | |
6780 | break; | |
6781 | } | |
d3656344 JA |
6782 | /* will complete beyond this point, count as submitted */ |
6783 | submitted++; | |
a1ab7b35 | 6784 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 6785 | break; |
6c271ce2 JA |
6786 | } |
6787 | ||
9466f437 PB |
6788 | if (unlikely(submitted != nr)) { |
6789 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 6790 | int unused = nr - ref_used; |
9466f437 | 6791 | |
09899b19 | 6792 | current->io_uring->cached_refs += unused; |
d8a6df10 | 6793 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 6794 | } |
6c271ce2 | 6795 | |
a1ab7b35 | 6796 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
6797 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6798 | io_commit_sqring(ctx); | |
6799 | ||
6c271ce2 JA |
6800 | return submitted; |
6801 | } | |
6802 | ||
e4b6d902 PB |
6803 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
6804 | { | |
6805 | return READ_ONCE(sqd->state); | |
6806 | } | |
6807 | ||
23b3628e XW |
6808 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6809 | { | |
6810 | /* Tell userspace we may need a wakeup call */ | |
6811 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6812 | WRITE_ONCE(ctx->rings->sq_flags, |
6813 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6814 | spin_unlock_irq(&ctx->completion_lock); |
6815 | } | |
6816 | ||
6817 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6818 | { | |
6819 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6820 | WRITE_ONCE(ctx->rings->sq_flags, |
6821 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6822 | spin_unlock_irq(&ctx->completion_lock); |
6823 | } | |
6824 | ||
08369246 | 6825 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6826 | { |
c8d1ba58 | 6827 | unsigned int to_submit; |
bdcd3eab | 6828 | int ret = 0; |
6c271ce2 | 6829 | |
c8d1ba58 | 6830 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 6831 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
6832 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
6833 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 6834 | |
906a3c6f | 6835 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 6836 | unsigned nr_events = 0; |
948e1947 PB |
6837 | const struct cred *creds = NULL; |
6838 | ||
6839 | if (ctx->sq_creds != current_cred()) | |
6840 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 6841 | |
c8d1ba58 | 6842 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 6843 | if (!list_empty(&ctx->iopoll_list)) |
3c30ef0f | 6844 | io_do_iopoll(ctx, &nr_events, 0, true); |
906a3c6f | 6845 | |
3b763ba1 PB |
6846 | /* |
6847 | * Don't submit if refs are dying, good for io_uring_register(), | |
6848 | * but also it is relied upon by io_ring_exit_work() | |
6849 | */ | |
0298ef96 PB |
6850 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
6851 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 6852 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 6853 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 6854 | |
acfb381d PB |
6855 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
6856 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
6857 | if (creds) |
6858 | revert_creds(creds); | |
acfb381d | 6859 | } |
6c271ce2 | 6860 | |
08369246 XW |
6861 | return ret; |
6862 | } | |
6c271ce2 | 6863 | |
08369246 XW |
6864 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
6865 | { | |
6866 | struct io_ring_ctx *ctx; | |
6867 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 6868 | |
c9dca27d PB |
6869 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6870 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 6871 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 6872 | } |
6c271ce2 | 6873 | |
e4b6d902 PB |
6874 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
6875 | { | |
6876 | bool did_sig = false; | |
6877 | struct ksignal ksig; | |
6878 | ||
6879 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
6880 | signal_pending(current)) { | |
6881 | mutex_unlock(&sqd->lock); | |
6882 | if (signal_pending(current)) | |
6883 | did_sig = get_signal(&ksig); | |
6884 | cond_resched(); | |
6885 | mutex_lock(&sqd->lock); | |
6886 | } | |
e4b6d902 PB |
6887 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
6888 | } | |
6889 | ||
c8d1ba58 JA |
6890 | static int io_sq_thread(void *data) |
6891 | { | |
69fb2131 JA |
6892 | struct io_sq_data *sqd = data; |
6893 | struct io_ring_ctx *ctx; | |
a0d9205f | 6894 | unsigned long timeout = 0; |
37d1e2e3 | 6895 | char buf[TASK_COMM_LEN]; |
08369246 | 6896 | DEFINE_WAIT(wait); |
6c271ce2 | 6897 | |
696ee88a | 6898 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 6899 | set_task_comm(current, buf); |
37d1e2e3 JA |
6900 | |
6901 | if (sqd->sq_cpu != -1) | |
6902 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
6903 | else | |
6904 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
6905 | current->flags |= PF_NO_SETAFFINITY; | |
6906 | ||
09a6f4ef | 6907 | mutex_lock(&sqd->lock); |
e4b6d902 | 6908 | while (1) { |
1a924a80 | 6909 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 6910 | |
e4b6d902 PB |
6911 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
6912 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 6913 | break; |
08369246 XW |
6914 | timeout = jiffies + sqd->sq_thread_idle; |
6915 | } | |
e4b6d902 | 6916 | |
e95eee2d | 6917 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 6918 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 6919 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 6920 | |
08369246 XW |
6921 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
6922 | sqt_spin = true; | |
69fb2131 | 6923 | } |
dd432ea5 PB |
6924 | if (io_run_task_work()) |
6925 | sqt_spin = true; | |
6c271ce2 | 6926 | |
08369246 | 6927 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 6928 | cond_resched(); |
08369246 XW |
6929 | if (sqt_spin) |
6930 | timeout = jiffies + sqd->sq_thread_idle; | |
6931 | continue; | |
6932 | } | |
6933 | ||
08369246 | 6934 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 6935 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
6936 | bool needs_sched = true; |
6937 | ||
724cb4f9 | 6938 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
6939 | io_ring_set_wakeup_flag(ctx); |
6940 | ||
724cb4f9 HX |
6941 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
6942 | !list_empty_careful(&ctx->iopoll_list)) { | |
6943 | needs_sched = false; | |
6944 | break; | |
6945 | } | |
6946 | if (io_sqring_entries(ctx)) { | |
6947 | needs_sched = false; | |
6948 | break; | |
6949 | } | |
6950 | } | |
6951 | ||
6952 | if (needs_sched) { | |
6953 | mutex_unlock(&sqd->lock); | |
6954 | schedule(); | |
6955 | mutex_lock(&sqd->lock); | |
6956 | } | |
69fb2131 JA |
6957 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6958 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6959 | } |
08369246 XW |
6960 | |
6961 | finish_wait(&sqd->wait, &wait); | |
6962 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 6963 | } |
28cea78a | 6964 | |
78cc687b | 6965 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 6966 | sqd->thread = NULL; |
05962f95 | 6967 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 6968 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 6969 | io_run_task_work(); |
734551df PB |
6970 | mutex_unlock(&sqd->lock); |
6971 | ||
37d1e2e3 JA |
6972 | complete(&sqd->exited); |
6973 | do_exit(0); | |
6c271ce2 JA |
6974 | } |
6975 | ||
bda52162 JA |
6976 | struct io_wait_queue { |
6977 | struct wait_queue_entry wq; | |
6978 | struct io_ring_ctx *ctx; | |
6979 | unsigned to_wait; | |
6980 | unsigned nr_timeouts; | |
6981 | }; | |
6982 | ||
6c503150 | 6983 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
6984 | { |
6985 | struct io_ring_ctx *ctx = iowq->ctx; | |
6986 | ||
6987 | /* | |
d195a66e | 6988 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6989 | * started waiting. For timeouts, we always want to return to userspace, |
6990 | * regardless of event count. | |
6991 | */ | |
6c503150 | 6992 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
6993 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6994 | } | |
6995 | ||
6996 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6997 | int wake_flags, void *key) | |
6998 | { | |
6999 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7000 | wq); | |
7001 | ||
6c503150 PB |
7002 | /* |
7003 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7004 | * the task, and the next invocation will do it. | |
7005 | */ | |
5ed7a37d | 7006 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7007 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7008 | return -1; | |
bda52162 JA |
7009 | } |
7010 | ||
af9c1a44 JA |
7011 | static int io_run_task_work_sig(void) |
7012 | { | |
7013 | if (io_run_task_work()) | |
7014 | return 1; | |
7015 | if (!signal_pending(current)) | |
7016 | return 0; | |
0b8cfa97 | 7017 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7018 | return -ERESTARTSYS; |
af9c1a44 JA |
7019 | return -EINTR; |
7020 | } | |
7021 | ||
eeb60b9a PB |
7022 | /* when returns >0, the caller should retry */ |
7023 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7024 | struct io_wait_queue *iowq, | |
7025 | signed long *timeout) | |
7026 | { | |
7027 | int ret; | |
7028 | ||
7029 | /* make sure we run task_work before checking for signals */ | |
7030 | ret = io_run_task_work_sig(); | |
7031 | if (ret || io_should_wake(iowq)) | |
7032 | return ret; | |
7033 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7034 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7035 | return 1; |
7036 | ||
7037 | *timeout = schedule_timeout(*timeout); | |
7038 | return !*timeout ? -ETIME : 1; | |
7039 | } | |
7040 | ||
2b188cc1 JA |
7041 | /* |
7042 | * Wait until events become available, if we don't already have some. The | |
7043 | * application must reap them itself, as they reside on the shared cq ring. | |
7044 | */ | |
7045 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7046 | const sigset_t __user *sig, size_t sigsz, |
7047 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7048 | { |
bda52162 JA |
7049 | struct io_wait_queue iowq = { |
7050 | .wq = { | |
7051 | .private = current, | |
7052 | .func = io_wake_function, | |
7053 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7054 | }, | |
7055 | .ctx = ctx, | |
7056 | .to_wait = min_events, | |
7057 | }; | |
75b28aff | 7058 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7059 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7060 | int ret; | |
2b188cc1 | 7061 | |
b41e9852 | 7062 | do { |
6c2450ae | 7063 | io_cqring_overflow_flush(ctx, false); |
6c503150 | 7064 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7065 | return 0; |
4c6e277c | 7066 | if (!io_run_task_work()) |
b41e9852 | 7067 | break; |
b41e9852 | 7068 | } while (1); |
2b188cc1 JA |
7069 | |
7070 | if (sig) { | |
9e75ad5d AB |
7071 | #ifdef CONFIG_COMPAT |
7072 | if (in_compat_syscall()) | |
7073 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7074 | sigsz); |
9e75ad5d AB |
7075 | else |
7076 | #endif | |
b772434b | 7077 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7078 | |
2b188cc1 JA |
7079 | if (ret) |
7080 | return ret; | |
7081 | } | |
7082 | ||
c73ebb68 | 7083 | if (uts) { |
c1d5a224 PB |
7084 | struct timespec64 ts; |
7085 | ||
c73ebb68 HX |
7086 | if (get_timespec64(&ts, uts)) |
7087 | return -EFAULT; | |
7088 | timeout = timespec64_to_jiffies(&ts); | |
7089 | } | |
7090 | ||
bda52162 | 7091 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7092 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7093 | do { |
ca0a2651 | 7094 | /* if we can't even flush overflow, don't wait for more */ |
6c2450ae | 7095 | if (!io_cqring_overflow_flush(ctx, false)) { |
ca0a2651 JA |
7096 | ret = -EBUSY; |
7097 | break; | |
7098 | } | |
311997b3 | 7099 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7100 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7101 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7102 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7103 | cond_resched(); |
eeb60b9a | 7104 | } while (ret > 0); |
bda52162 | 7105 | |
b7db41c9 | 7106 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7107 | |
75b28aff | 7108 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7109 | } |
7110 | ||
9123c8ff | 7111 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7112 | { |
9123c8ff | 7113 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7114 | |
846a4ef2 | 7115 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7116 | kfree(table[i]); |
7117 | kfree(table); | |
7118 | } | |
7119 | ||
7120 | static void **io_alloc_page_table(size_t size) | |
7121 | { | |
7122 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7123 | size_t init_size = size; | |
7124 | void **table; | |
7125 | ||
7126 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL); | |
7127 | if (!table) | |
7128 | return NULL; | |
7129 | ||
7130 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7131 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff PB |
7132 | |
7133 | table[i] = kzalloc(this_size, GFP_KERNEL); | |
7134 | if (!table[i]) { | |
7135 | io_free_page_table(table, init_size); | |
7136 | return NULL; | |
7137 | } | |
7138 | size -= this_size; | |
7139 | } | |
7140 | return table; | |
05f3fb3c JA |
7141 | } |
7142 | ||
28a9fe25 | 7143 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7144 | { |
28a9fe25 PB |
7145 | percpu_ref_exit(&ref_node->refs); |
7146 | kfree(ref_node); | |
1642b445 PB |
7147 | } |
7148 | ||
a7f0ed5a PB |
7149 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7150 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7151 | { |
a7f0ed5a PB |
7152 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7153 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7154 | |
a7f0ed5a PB |
7155 | if (data_to_kill) { |
7156 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7157 | |
a7f0ed5a | 7158 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7159 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7160 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7161 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7162 | |
3e942498 | 7163 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7164 | percpu_ref_kill(&rsrc_node->refs); |
7165 | ctx->rsrc_node = NULL; | |
7166 | } | |
6b06314c | 7167 | |
a7f0ed5a PB |
7168 | if (!ctx->rsrc_node) { |
7169 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7170 | ctx->rsrc_backup_node = NULL; | |
7171 | } | |
8bad28d8 HX |
7172 | } |
7173 | ||
a7f0ed5a | 7174 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7175 | { |
7176 | if (ctx->rsrc_backup_node) | |
7177 | return 0; | |
b895c9a6 | 7178 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7179 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7180 | } |
7181 | ||
40ae0ff7 | 7182 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7183 | { |
7184 | int ret; | |
05589553 | 7185 | |
215c3902 | 7186 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7187 | if (data->quiesce) |
7188 | return -ENXIO; | |
05589553 | 7189 | |
8bad28d8 | 7190 | data->quiesce = true; |
1ffc5422 | 7191 | do { |
a7f0ed5a | 7192 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7193 | if (ret) |
f2303b1f | 7194 | break; |
a7f0ed5a | 7195 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7196 | |
3e942498 PB |
7197 | /* kill initial ref, already quiesced if zero */ |
7198 | if (atomic_dec_and_test(&data->refs)) | |
7199 | break; | |
c018db4a | 7200 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7201 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7202 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7203 | if (!ret) { |
7204 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7205 | break; |
c018db4a | 7206 | } |
8bad28d8 | 7207 | |
3e942498 PB |
7208 | atomic_inc(&data->refs); |
7209 | /* wait for all works potentially completing data->done */ | |
7210 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7211 | reinit_completion(&data->done); |
8dd03afe | 7212 | |
1ffc5422 | 7213 | ret = io_run_task_work_sig(); |
8bad28d8 | 7214 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7215 | } while (ret >= 0); |
8bad28d8 | 7216 | data->quiesce = false; |
05f3fb3c | 7217 | |
8bad28d8 | 7218 | return ret; |
d7954b2b BM |
7219 | } |
7220 | ||
2d091d62 PB |
7221 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7222 | { | |
7223 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7224 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7225 | ||
7226 | return &data->tags[table_idx][off]; | |
7227 | } | |
7228 | ||
44b31f2f | 7229 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7230 | { |
2d091d62 PB |
7231 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7232 | ||
7233 | if (data->tags) | |
7234 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7235 | kfree(data); |
7236 | } | |
7237 | ||
d878c816 PB |
7238 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7239 | u64 __user *utags, unsigned nr, | |
7240 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7241 | { |
b895c9a6 | 7242 | struct io_rsrc_data *data; |
2d091d62 | 7243 | int ret = -ENOMEM; |
d878c816 | 7244 | unsigned i; |
1ad555c6 BM |
7245 | |
7246 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7247 | if (!data) | |
d878c816 | 7248 | return -ENOMEM; |
2d091d62 | 7249 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7250 | if (!data->tags) { |
1ad555c6 | 7251 | kfree(data); |
d878c816 PB |
7252 | return -ENOMEM; |
7253 | } | |
2d091d62 PB |
7254 | |
7255 | data->nr = nr; | |
7256 | data->ctx = ctx; | |
7257 | data->do_put = do_put; | |
d878c816 | 7258 | if (utags) { |
2d091d62 | 7259 | ret = -EFAULT; |
d878c816 | 7260 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7261 | u64 *tag_slot = io_get_tag_slot(data, i); |
7262 | ||
7263 | if (copy_from_user(tag_slot, &utags[i], | |
7264 | sizeof(*tag_slot))) | |
2d091d62 | 7265 | goto fail; |
d878c816 | 7266 | } |
1ad555c6 | 7267 | } |
b60c8dce | 7268 | |
3e942498 | 7269 | atomic_set(&data->refs, 1); |
1ad555c6 | 7270 | init_completion(&data->done); |
d878c816 PB |
7271 | *pdata = data; |
7272 | return 0; | |
2d091d62 PB |
7273 | fail: |
7274 | io_rsrc_data_free(data); | |
7275 | return ret; | |
1ad555c6 BM |
7276 | } |
7277 | ||
9123c8ff PB |
7278 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7279 | { | |
7280 | size_t size = nr_files * sizeof(struct io_fixed_file); | |
7281 | ||
7282 | table->files = (struct io_fixed_file **)io_alloc_page_table(size); | |
7283 | return !!table->files; | |
7284 | } | |
7285 | ||
7286 | static void io_free_file_tables(struct io_file_table *table, unsigned nr_files) | |
7287 | { | |
7288 | size_t size = nr_files * sizeof(struct io_fixed_file); | |
7289 | ||
7290 | io_free_page_table((void **)table->files, size); | |
7291 | table->files = NULL; | |
7292 | } | |
7293 | ||
fff4db76 | 7294 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7295 | { |
fff4db76 PB |
7296 | #if defined(CONFIG_UNIX) |
7297 | if (ctx->ring_sock) { | |
7298 | struct sock *sock = ctx->ring_sock->sk; | |
7299 | struct sk_buff *skb; | |
7300 | ||
7301 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7302 | kfree_skb(skb); | |
7303 | } | |
7304 | #else | |
7305 | int i; | |
7306 | ||
7307 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7308 | struct file *file; | |
7309 | ||
7310 | file = io_file_from_index(ctx, i); | |
7311 | if (file) | |
7312 | fput(file); | |
7313 | } | |
7314 | #endif | |
7315 | io_free_file_tables(&ctx->file_table, ctx->nr_user_files); | |
44b31f2f | 7316 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7317 | ctx->file_data = NULL; |
7318 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7319 | } |
7320 | ||
d7954b2b BM |
7321 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7322 | { | |
d7954b2b BM |
7323 | int ret; |
7324 | ||
08480400 | 7325 | if (!ctx->file_data) |
d7954b2b | 7326 | return -ENXIO; |
08480400 PB |
7327 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7328 | if (!ret) | |
7329 | __io_sqe_files_unregister(ctx); | |
7330 | return ret; | |
6b06314c JA |
7331 | } |
7332 | ||
37d1e2e3 | 7333 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7334 | __releases(&sqd->lock) |
37d1e2e3 | 7335 | { |
521d6a73 PB |
7336 | WARN_ON_ONCE(sqd->thread == current); |
7337 | ||
9e138a48 PB |
7338 | /* |
7339 | * Do the dance but not conditional clear_bit() because it'd race with | |
7340 | * other threads incrementing park_pending and setting the bit. | |
7341 | */ | |
37d1e2e3 | 7342 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7343 | if (atomic_dec_return(&sqd->park_pending)) |
7344 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7345 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7346 | } |
7347 | ||
86e0d676 | 7348 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7349 | __acquires(&sqd->lock) |
37d1e2e3 | 7350 | { |
521d6a73 PB |
7351 | WARN_ON_ONCE(sqd->thread == current); |
7352 | ||
9e138a48 | 7353 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7354 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7355 | mutex_lock(&sqd->lock); |
05962f95 | 7356 | if (sqd->thread) |
86e0d676 | 7357 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7358 | } |
7359 | ||
7360 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7361 | { | |
521d6a73 | 7362 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7363 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7364 | |
05962f95 | 7365 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7366 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7367 | if (sqd->thread) |
7368 | wake_up_process(sqd->thread); | |
09a6f4ef | 7369 | mutex_unlock(&sqd->lock); |
05962f95 | 7370 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7371 | } |
7372 | ||
534ca6d6 | 7373 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7374 | { |
534ca6d6 | 7375 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7376 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7377 | ||
37d1e2e3 JA |
7378 | io_sq_thread_stop(sqd); |
7379 | kfree(sqd); | |
7380 | } | |
7381 | } | |
7382 | ||
7383 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7384 | { | |
7385 | struct io_sq_data *sqd = ctx->sq_data; | |
7386 | ||
7387 | if (sqd) { | |
05962f95 | 7388 | io_sq_thread_park(sqd); |
521d6a73 | 7389 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7390 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7391 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7392 | |
7393 | io_put_sq_data(sqd); | |
7394 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7395 | } |
7396 | } | |
7397 | ||
aa06165d JA |
7398 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7399 | { | |
7400 | struct io_ring_ctx *ctx_attach; | |
7401 | struct io_sq_data *sqd; | |
7402 | struct fd f; | |
7403 | ||
7404 | f = fdget(p->wq_fd); | |
7405 | if (!f.file) | |
7406 | return ERR_PTR(-ENXIO); | |
7407 | if (f.file->f_op != &io_uring_fops) { | |
7408 | fdput(f); | |
7409 | return ERR_PTR(-EINVAL); | |
7410 | } | |
7411 | ||
7412 | ctx_attach = f.file->private_data; | |
7413 | sqd = ctx_attach->sq_data; | |
7414 | if (!sqd) { | |
7415 | fdput(f); | |
7416 | return ERR_PTR(-EINVAL); | |
7417 | } | |
5c2469e0 JA |
7418 | if (sqd->task_tgid != current->tgid) { |
7419 | fdput(f); | |
7420 | return ERR_PTR(-EPERM); | |
7421 | } | |
aa06165d JA |
7422 | |
7423 | refcount_inc(&sqd->refs); | |
7424 | fdput(f); | |
7425 | return sqd; | |
7426 | } | |
7427 | ||
26984fbf PB |
7428 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7429 | bool *attached) | |
534ca6d6 JA |
7430 | { |
7431 | struct io_sq_data *sqd; | |
7432 | ||
26984fbf | 7433 | *attached = false; |
5c2469e0 JA |
7434 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7435 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7436 | if (!IS_ERR(sqd)) { |
7437 | *attached = true; | |
5c2469e0 | 7438 | return sqd; |
26984fbf | 7439 | } |
5c2469e0 JA |
7440 | /* fall through for EPERM case, setup new sqd/task */ |
7441 | if (PTR_ERR(sqd) != -EPERM) | |
7442 | return sqd; | |
7443 | } | |
aa06165d | 7444 | |
534ca6d6 JA |
7445 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7446 | if (!sqd) | |
7447 | return ERR_PTR(-ENOMEM); | |
7448 | ||
9e138a48 | 7449 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7450 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7451 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7452 | mutex_init(&sqd->lock); |
534ca6d6 | 7453 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7454 | init_completion(&sqd->exited); |
534ca6d6 JA |
7455 | return sqd; |
7456 | } | |
7457 | ||
6b06314c | 7458 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7459 | /* |
7460 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7461 | * the io_uring can be safely unregistered on process exit, even if we have | |
7462 | * loops in the file referencing. | |
7463 | */ | |
7464 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7465 | { | |
7466 | struct sock *sk = ctx->ring_sock->sk; | |
7467 | struct scm_fp_list *fpl; | |
7468 | struct sk_buff *skb; | |
08a45173 | 7469 | int i, nr_files; |
6b06314c | 7470 | |
6b06314c JA |
7471 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7472 | if (!fpl) | |
7473 | return -ENOMEM; | |
7474 | ||
7475 | skb = alloc_skb(0, GFP_KERNEL); | |
7476 | if (!skb) { | |
7477 | kfree(fpl); | |
7478 | return -ENOMEM; | |
7479 | } | |
7480 | ||
7481 | skb->sk = sk; | |
6b06314c | 7482 | |
08a45173 | 7483 | nr_files = 0; |
62e398be | 7484 | fpl->user = get_uid(current_user()); |
6b06314c | 7485 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7486 | struct file *file = io_file_from_index(ctx, i + offset); |
7487 | ||
7488 | if (!file) | |
08a45173 | 7489 | continue; |
65e19f54 | 7490 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7491 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7492 | nr_files++; | |
6b06314c JA |
7493 | } |
7494 | ||
08a45173 JA |
7495 | if (nr_files) { |
7496 | fpl->max = SCM_MAX_FD; | |
7497 | fpl->count = nr_files; | |
7498 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7499 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7500 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7501 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7502 | |
08a45173 JA |
7503 | for (i = 0; i < nr_files; i++) |
7504 | fput(fpl->fp[i]); | |
7505 | } else { | |
7506 | kfree_skb(skb); | |
7507 | kfree(fpl); | |
7508 | } | |
6b06314c JA |
7509 | |
7510 | return 0; | |
7511 | } | |
7512 | ||
7513 | /* | |
7514 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7515 | * causes regular reference counting to break down. We rely on the UNIX | |
7516 | * garbage collection to take care of this problem for us. | |
7517 | */ | |
7518 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7519 | { | |
7520 | unsigned left, total; | |
7521 | int ret = 0; | |
7522 | ||
7523 | total = 0; | |
7524 | left = ctx->nr_user_files; | |
7525 | while (left) { | |
7526 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7527 | |
7528 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7529 | if (ret) | |
7530 | break; | |
7531 | left -= this_files; | |
7532 | total += this_files; | |
7533 | } | |
7534 | ||
7535 | if (!ret) | |
7536 | return 0; | |
7537 | ||
7538 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7539 | struct file *file = io_file_from_index(ctx, total); |
7540 | ||
7541 | if (file) | |
7542 | fput(file); | |
6b06314c JA |
7543 | total++; |
7544 | } | |
7545 | ||
7546 | return ret; | |
7547 | } | |
7548 | #else | |
7549 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7550 | { | |
7551 | return 0; | |
7552 | } | |
7553 | #endif | |
7554 | ||
47e90392 | 7555 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7556 | { |
50238531 | 7557 | struct file *file = prsrc->file; |
05f3fb3c JA |
7558 | #if defined(CONFIG_UNIX) |
7559 | struct sock *sock = ctx->ring_sock->sk; | |
7560 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7561 | struct sk_buff *skb; | |
7562 | int i; | |
7563 | ||
7564 | __skb_queue_head_init(&list); | |
7565 | ||
7566 | /* | |
7567 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7568 | * remove this entry and rearrange the file array. | |
7569 | */ | |
7570 | skb = skb_dequeue(head); | |
7571 | while (skb) { | |
7572 | struct scm_fp_list *fp; | |
7573 | ||
7574 | fp = UNIXCB(skb).fp; | |
7575 | for (i = 0; i < fp->count; i++) { | |
7576 | int left; | |
7577 | ||
7578 | if (fp->fp[i] != file) | |
7579 | continue; | |
7580 | ||
7581 | unix_notinflight(fp->user, fp->fp[i]); | |
7582 | left = fp->count - 1 - i; | |
7583 | if (left) { | |
7584 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7585 | left * sizeof(struct file *)); | |
7586 | } | |
7587 | fp->count--; | |
7588 | if (!fp->count) { | |
7589 | kfree_skb(skb); | |
7590 | skb = NULL; | |
7591 | } else { | |
7592 | __skb_queue_tail(&list, skb); | |
7593 | } | |
7594 | fput(file); | |
7595 | file = NULL; | |
7596 | break; | |
7597 | } | |
7598 | ||
7599 | if (!file) | |
7600 | break; | |
7601 | ||
7602 | __skb_queue_tail(&list, skb); | |
7603 | ||
7604 | skb = skb_dequeue(head); | |
7605 | } | |
7606 | ||
7607 | if (skb_peek(&list)) { | |
7608 | spin_lock_irq(&head->lock); | |
7609 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7610 | __skb_queue_tail(head, skb); | |
7611 | spin_unlock_irq(&head->lock); | |
7612 | } | |
7613 | #else | |
7614 | fput(file); | |
7615 | #endif | |
7616 | } | |
7617 | ||
b895c9a6 | 7618 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 7619 | { |
b895c9a6 | 7620 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
7621 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
7622 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7623 | |
269bbe5f BM |
7624 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7625 | list_del(&prsrc->list); | |
b60c8dce PB |
7626 | |
7627 | if (prsrc->tag) { | |
7628 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
7629 | |
7630 | io_ring_submit_lock(ctx, lock_ring); | |
157d257f | 7631 | spin_lock_irq(&ctx->completion_lock); |
b60c8dce | 7632 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 7633 | ctx->cq_extra++; |
b60c8dce | 7634 | io_commit_cqring(ctx); |
157d257f | 7635 | spin_unlock_irq(&ctx->completion_lock); |
b60c8dce PB |
7636 | io_cqring_ev_posted(ctx); |
7637 | io_ring_submit_unlock(ctx, lock_ring); | |
7638 | } | |
7639 | ||
40ae0ff7 | 7640 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 7641 | kfree(prsrc); |
65e19f54 | 7642 | } |
05589553 | 7643 | |
28a9fe25 | 7644 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
7645 | if (atomic_dec_and_test(&rsrc_data->refs)) |
7646 | complete(&rsrc_data->done); | |
2faf852d | 7647 | } |
65e19f54 | 7648 | |
269bbe5f | 7649 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7650 | { |
7651 | struct io_ring_ctx *ctx; | |
7652 | struct llist_node *node; | |
7653 | ||
269bbe5f BM |
7654 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7655 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7656 | |
7657 | while (node) { | |
b895c9a6 | 7658 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
7659 | struct llist_node *next = node->next; |
7660 | ||
b895c9a6 | 7661 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 7662 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
7663 | node = next; |
7664 | } | |
7665 | } | |
7666 | ||
00835dce | 7667 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
2faf852d | 7668 | { |
b895c9a6 | 7669 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); |
3e942498 | 7670 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; |
4956b9ea | 7671 | unsigned long flags; |
e297822b | 7672 | bool first_add = false; |
e297822b | 7673 | |
4956b9ea | 7674 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); |
b895c9a6 | 7675 | node->done = true; |
e297822b | 7676 | |
d67d2263 | 7677 | while (!list_empty(&ctx->rsrc_ref_list)) { |
b895c9a6 PB |
7678 | node = list_first_entry(&ctx->rsrc_ref_list, |
7679 | struct io_rsrc_node, node); | |
e297822b | 7680 | /* recycle ref nodes in order */ |
b895c9a6 | 7681 | if (!node->done) |
e297822b | 7682 | break; |
b895c9a6 PB |
7683 | list_del(&node->node); |
7684 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
e297822b | 7685 | } |
4956b9ea | 7686 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); |
05589553 | 7687 | |
3e942498 PB |
7688 | if (first_add) |
7689 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
05f3fb3c | 7690 | } |
65e19f54 | 7691 | |
b895c9a6 | 7692 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) |
05f3fb3c | 7693 | { |
b895c9a6 | 7694 | struct io_rsrc_node *ref_node; |
05f3fb3c | 7695 | |
05589553 XW |
7696 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7697 | if (!ref_node) | |
3e2224c5 | 7698 | return NULL; |
05f3fb3c | 7699 | |
00835dce | 7700 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
05589553 XW |
7701 | 0, GFP_KERNEL)) { |
7702 | kfree(ref_node); | |
3e2224c5 | 7703 | return NULL; |
05589553 XW |
7704 | } |
7705 | INIT_LIST_HEAD(&ref_node->node); | |
269bbe5f | 7706 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
e297822b | 7707 | ref_node->done = false; |
05589553 | 7708 | return ref_node; |
05589553 XW |
7709 | } |
7710 | ||
6b06314c | 7711 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 7712 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
7713 | { |
7714 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 7715 | struct file *file; |
f3baed39 | 7716 | int fd, ret; |
846a4ef2 | 7717 | unsigned i; |
6b06314c | 7718 | |
05f3fb3c | 7719 | if (ctx->file_data) |
6b06314c JA |
7720 | return -EBUSY; |
7721 | if (!nr_args) | |
7722 | return -EINVAL; | |
7723 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7724 | return -EMFILE; | |
a7f0ed5a | 7725 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
7726 | if (ret) |
7727 | return ret; | |
d878c816 PB |
7728 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
7729 | &ctx->file_data); | |
7730 | if (ret) | |
7731 | return ret; | |
6b06314c | 7732 | |
f3baed39 | 7733 | ret = -ENOMEM; |
aeca241b | 7734 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 7735 | goto out_free; |
65e19f54 | 7736 | |
08a45173 | 7737 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 7738 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
7739 | ret = -EFAULT; |
7740 | goto out_fput; | |
7741 | } | |
08a45173 | 7742 | /* allow sparse sets */ |
792e3582 PB |
7743 | if (fd == -1) { |
7744 | ret = -EINVAL; | |
2d091d62 | 7745 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 7746 | goto out_fput; |
08a45173 | 7747 | continue; |
792e3582 | 7748 | } |
6b06314c | 7749 | |
05f3fb3c | 7750 | file = fget(fd); |
6b06314c | 7751 | ret = -EBADF; |
792e3582 | 7752 | if (unlikely(!file)) |
600cf3f8 | 7753 | goto out_fput; |
05f3fb3c | 7754 | |
6b06314c JA |
7755 | /* |
7756 | * Don't allow io_uring instances to be registered. If UNIX | |
7757 | * isn't enabled, then this causes a reference cycle and this | |
7758 | * instance can never get freed. If UNIX is enabled we'll | |
7759 | * handle it just fine, but there's still no point in allowing | |
7760 | * a ring fd as it doesn't support regular read/write anyway. | |
7761 | */ | |
05f3fb3c JA |
7762 | if (file->f_op == &io_uring_fops) { |
7763 | fput(file); | |
600cf3f8 | 7764 | goto out_fput; |
6b06314c | 7765 | } |
aeca241b | 7766 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
7767 | } |
7768 | ||
6b06314c | 7769 | ret = io_sqe_files_scm(ctx); |
05589553 | 7770 | if (ret) { |
08480400 | 7771 | __io_sqe_files_unregister(ctx); |
05589553 XW |
7772 | return ret; |
7773 | } | |
6b06314c | 7774 | |
a7f0ed5a | 7775 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 7776 | return ret; |
600cf3f8 PB |
7777 | out_fput: |
7778 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7779 | file = io_file_from_index(ctx, i); | |
7780 | if (file) | |
7781 | fput(file); | |
7782 | } | |
aeca241b | 7783 | io_free_file_tables(&ctx->file_table, nr_args); |
600cf3f8 | 7784 | ctx->nr_user_files = 0; |
600cf3f8 | 7785 | out_free: |
44b31f2f | 7786 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 7787 | ctx->file_data = NULL; |
6b06314c JA |
7788 | return ret; |
7789 | } | |
7790 | ||
c3a31e60 JA |
7791 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7792 | int index) | |
7793 | { | |
7794 | #if defined(CONFIG_UNIX) | |
7795 | struct sock *sock = ctx->ring_sock->sk; | |
7796 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7797 | struct sk_buff *skb; | |
7798 | ||
7799 | /* | |
7800 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7801 | * file set. If there's no room, fall back to allocating a new skb | |
7802 | * and filling it in. | |
7803 | */ | |
7804 | spin_lock_irq(&head->lock); | |
7805 | skb = skb_peek(head); | |
7806 | if (skb) { | |
7807 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7808 | ||
7809 | if (fpl->count < SCM_MAX_FD) { | |
7810 | __skb_unlink(skb, head); | |
7811 | spin_unlock_irq(&head->lock); | |
7812 | fpl->fp[fpl->count] = get_file(file); | |
7813 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7814 | fpl->count++; | |
7815 | spin_lock_irq(&head->lock); | |
7816 | __skb_queue_head(head, skb); | |
7817 | } else { | |
7818 | skb = NULL; | |
7819 | } | |
7820 | } | |
7821 | spin_unlock_irq(&head->lock); | |
7822 | ||
7823 | if (skb) { | |
7824 | fput(file); | |
7825 | return 0; | |
7826 | } | |
7827 | ||
7828 | return __io_sqe_files_scm(ctx, 1, index); | |
7829 | #else | |
7830 | return 0; | |
7831 | #endif | |
7832 | } | |
7833 | ||
b60c8dce | 7834 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
e7c78371 | 7835 | struct io_rsrc_node *node, void *rsrc) |
05f3fb3c | 7836 | { |
269bbe5f | 7837 | struct io_rsrc_put *prsrc; |
05f3fb3c | 7838 | |
269bbe5f BM |
7839 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
7840 | if (!prsrc) | |
a5318d3c | 7841 | return -ENOMEM; |
05f3fb3c | 7842 | |
2d091d62 | 7843 | prsrc->tag = *io_get_tag_slot(data, idx); |
50238531 | 7844 | prsrc->rsrc = rsrc; |
e7c78371 | 7845 | list_add(&prsrc->list, &node->rsrc_list); |
a5318d3c | 7846 | return 0; |
05f3fb3c JA |
7847 | } |
7848 | ||
7849 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
c3bdad02 | 7850 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
7851 | unsigned nr_args) |
7852 | { | |
c3bdad02 | 7853 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 7854 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 7855 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
7856 | struct io_fixed_file *file_slot; |
7857 | struct file *file; | |
98f0b3b4 PB |
7858 | int fd, i, err = 0; |
7859 | unsigned int done; | |
05589553 | 7860 | bool needs_switch = false; |
c3a31e60 | 7861 | |
98f0b3b4 PB |
7862 | if (!ctx->file_data) |
7863 | return -ENXIO; | |
7864 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
7865 | return -EINVAL; |
7866 | ||
67973b93 | 7867 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
7868 | u64 tag = 0; |
7869 | ||
7870 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
7871 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
7872 | err = -EFAULT; |
7873 | break; | |
7874 | } | |
c3bdad02 PB |
7875 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
7876 | err = -EINVAL; | |
7877 | break; | |
7878 | } | |
4e0377a1 | 7879 | if (fd == IORING_REGISTER_FILES_SKIP) |
7880 | continue; | |
7881 | ||
67973b93 | 7882 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 7883 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 7884 | |
a04b0ac0 PB |
7885 | if (file_slot->file_ptr) { |
7886 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
7887 | err = io_queue_rsrc_removal(data, up->offset + done, |
7888 | ctx->rsrc_node, file); | |
a5318d3c HD |
7889 | if (err) |
7890 | break; | |
a04b0ac0 | 7891 | file_slot->file_ptr = 0; |
05589553 | 7892 | needs_switch = true; |
c3a31e60 JA |
7893 | } |
7894 | if (fd != -1) { | |
c3a31e60 JA |
7895 | file = fget(fd); |
7896 | if (!file) { | |
7897 | err = -EBADF; | |
7898 | break; | |
7899 | } | |
7900 | /* | |
7901 | * Don't allow io_uring instances to be registered. If | |
7902 | * UNIX isn't enabled, then this causes a reference | |
7903 | * cycle and this instance can never get freed. If UNIX | |
7904 | * is enabled we'll handle it just fine, but there's | |
7905 | * still no point in allowing a ring fd as it doesn't | |
7906 | * support regular read/write anyway. | |
7907 | */ | |
7908 | if (file->f_op == &io_uring_fops) { | |
7909 | fput(file); | |
7910 | err = -EBADF; | |
7911 | break; | |
7912 | } | |
2d091d62 | 7913 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 7914 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 7915 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7916 | if (err) { |
a04b0ac0 | 7917 | file_slot->file_ptr = 0; |
f3bd9dae | 7918 | fput(file); |
c3a31e60 | 7919 | break; |
f3bd9dae | 7920 | } |
c3a31e60 | 7921 | } |
05f3fb3c JA |
7922 | } |
7923 | ||
a7f0ed5a PB |
7924 | if (needs_switch) |
7925 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
7926 | return done ? done : err; |
7927 | } | |
05589553 | 7928 | |
5280f7e5 | 7929 | static struct io_wq_work *io_free_work(struct io_wq_work *work) |
7d723065 JA |
7930 | { |
7931 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7932 | ||
5280f7e5 PB |
7933 | req = io_put_req_find_next(req); |
7934 | return req ? &req->work : NULL; | |
7d723065 JA |
7935 | } |
7936 | ||
685fe7fe JA |
7937 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
7938 | struct task_struct *task) | |
24369c2e | 7939 | { |
e941894e | 7940 | struct io_wq_hash *hash; |
24369c2e | 7941 | struct io_wq_data data; |
24369c2e | 7942 | unsigned int concurrency; |
24369c2e | 7943 | |
362a9e65 | 7944 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
7945 | hash = ctx->hash_map; |
7946 | if (!hash) { | |
7947 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
7948 | if (!hash) { |
7949 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 7950 | return ERR_PTR(-ENOMEM); |
362a9e65 | 7951 | } |
e941894e JA |
7952 | refcount_set(&hash->refs, 1); |
7953 | init_waitqueue_head(&hash->wait); | |
7954 | ctx->hash_map = hash; | |
24369c2e | 7955 | } |
362a9e65 | 7956 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 7957 | |
e941894e | 7958 | data.hash = hash; |
685fe7fe | 7959 | data.task = task; |
e9fd9396 | 7960 | data.free_work = io_free_work; |
f5fa38c5 | 7961 | data.do_work = io_wq_submit_work; |
24369c2e | 7962 | |
d25e3a3d JA |
7963 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
7964 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 7965 | |
5aa75ed5 | 7966 | return io_wq_create(concurrency, &data); |
24369c2e PB |
7967 | } |
7968 | ||
5aa75ed5 JA |
7969 | static int io_uring_alloc_task_context(struct task_struct *task, |
7970 | struct io_ring_ctx *ctx) | |
0f212204 JA |
7971 | { |
7972 | struct io_uring_task *tctx; | |
d8a6df10 | 7973 | int ret; |
0f212204 | 7974 | |
09899b19 | 7975 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
7976 | if (unlikely(!tctx)) |
7977 | return -ENOMEM; | |
7978 | ||
d8a6df10 JA |
7979 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7980 | if (unlikely(ret)) { | |
7981 | kfree(tctx); | |
7982 | return ret; | |
7983 | } | |
7984 | ||
685fe7fe | 7985 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
7986 | if (IS_ERR(tctx->io_wq)) { |
7987 | ret = PTR_ERR(tctx->io_wq); | |
7988 | percpu_counter_destroy(&tctx->inflight); | |
7989 | kfree(tctx); | |
7990 | return ret; | |
7991 | } | |
7992 | ||
0f212204 JA |
7993 | xa_init(&tctx->xa); |
7994 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 7995 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 7996 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 7997 | task->io_uring = tctx; |
7cbf1722 JA |
7998 | spin_lock_init(&tctx->task_lock); |
7999 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8000 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8001 | return 0; |
8002 | } | |
8003 | ||
8004 | void __io_uring_free(struct task_struct *tsk) | |
8005 | { | |
8006 | struct io_uring_task *tctx = tsk->io_uring; | |
8007 | ||
8008 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8009 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8010 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8011 | |
d8a6df10 | 8012 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8013 | kfree(tctx); |
8014 | tsk->io_uring = NULL; | |
8015 | } | |
8016 | ||
7e84e1c7 SG |
8017 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8018 | struct io_uring_params *p) | |
2b188cc1 JA |
8019 | { |
8020 | int ret; | |
8021 | ||
d25e3a3d JA |
8022 | /* Retain compatibility with failing for an invalid attach attempt */ |
8023 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8024 | IORING_SETUP_ATTACH_WQ) { | |
8025 | struct fd f; | |
8026 | ||
8027 | f = fdget(p->wq_fd); | |
8028 | if (!f.file) | |
8029 | return -ENXIO; | |
0cc936f7 JA |
8030 | if (f.file->f_op != &io_uring_fops) { |
8031 | fdput(f); | |
f2a48dd0 | 8032 | return -EINVAL; |
0cc936f7 JA |
8033 | } |
8034 | fdput(f); | |
d25e3a3d | 8035 | } |
6c271ce2 | 8036 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8037 | struct task_struct *tsk; |
534ca6d6 | 8038 | struct io_sq_data *sqd; |
26984fbf | 8039 | bool attached; |
534ca6d6 | 8040 | |
26984fbf | 8041 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8042 | if (IS_ERR(sqd)) { |
8043 | ret = PTR_ERR(sqd); | |
8044 | goto err; | |
8045 | } | |
69fb2131 | 8046 | |
7c30f36a | 8047 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8048 | ctx->sq_data = sqd; |
917257da JA |
8049 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8050 | if (!ctx->sq_thread_idle) | |
8051 | ctx->sq_thread_idle = HZ; | |
8052 | ||
78d7f6ba | 8053 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8054 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8055 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8056 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8057 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8058 | io_sq_thread_unpark(sqd); |
8059 | ||
de75a3d3 PB |
8060 | if (ret < 0) |
8061 | goto err; | |
8062 | if (attached) | |
5aa75ed5 | 8063 | return 0; |
aa06165d | 8064 | |
6c271ce2 | 8065 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8066 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8067 | |
917257da | 8068 | ret = -EINVAL; |
f2a48dd0 | 8069 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8070 | goto err_sqpoll; |
37d1e2e3 | 8071 | sqd->sq_cpu = cpu; |
6c271ce2 | 8072 | } else { |
37d1e2e3 | 8073 | sqd->sq_cpu = -1; |
6c271ce2 | 8074 | } |
37d1e2e3 JA |
8075 | |
8076 | sqd->task_pid = current->pid; | |
5c2469e0 | 8077 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8078 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8079 | if (IS_ERR(tsk)) { | |
8080 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8081 | goto err_sqpoll; |
6c271ce2 | 8082 | } |
97a73a0f | 8083 | |
46fe18b1 | 8084 | sqd->thread = tsk; |
97a73a0f | 8085 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8086 | wake_up_new_task(tsk); |
0f212204 JA |
8087 | if (ret) |
8088 | goto err; | |
6c271ce2 JA |
8089 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8090 | /* Can't have SQ_AFF without SQPOLL */ | |
8091 | ret = -EINVAL; | |
8092 | goto err; | |
8093 | } | |
8094 | ||
2b188cc1 | 8095 | return 0; |
f2a48dd0 PB |
8096 | err_sqpoll: |
8097 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8098 | err: |
37d1e2e3 | 8099 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8100 | return ret; |
8101 | } | |
8102 | ||
a087e2b5 BM |
8103 | static inline void __io_unaccount_mem(struct user_struct *user, |
8104 | unsigned long nr_pages) | |
2b188cc1 JA |
8105 | { |
8106 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8107 | } | |
8108 | ||
a087e2b5 BM |
8109 | static inline int __io_account_mem(struct user_struct *user, |
8110 | unsigned long nr_pages) | |
2b188cc1 JA |
8111 | { |
8112 | unsigned long page_limit, cur_pages, new_pages; | |
8113 | ||
8114 | /* Don't allow more pages than we can safely lock */ | |
8115 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8116 | ||
8117 | do { | |
8118 | cur_pages = atomic_long_read(&user->locked_vm); | |
8119 | new_pages = cur_pages + nr_pages; | |
8120 | if (new_pages > page_limit) | |
8121 | return -ENOMEM; | |
8122 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8123 | new_pages) != cur_pages); | |
8124 | ||
8125 | return 0; | |
8126 | } | |
8127 | ||
26bfa89e | 8128 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8129 | { |
62e398be | 8130 | if (ctx->user) |
a087e2b5 | 8131 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8132 | |
26bfa89e JA |
8133 | if (ctx->mm_account) |
8134 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8135 | } |
8136 | ||
26bfa89e | 8137 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8138 | { |
30975825 BM |
8139 | int ret; |
8140 | ||
62e398be | 8141 | if (ctx->user) { |
30975825 BM |
8142 | ret = __io_account_mem(ctx->user, nr_pages); |
8143 | if (ret) | |
8144 | return ret; | |
8145 | } | |
8146 | ||
26bfa89e JA |
8147 | if (ctx->mm_account) |
8148 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8149 | |
8150 | return 0; | |
8151 | } | |
8152 | ||
2b188cc1 JA |
8153 | static void io_mem_free(void *ptr) |
8154 | { | |
52e04ef4 MR |
8155 | struct page *page; |
8156 | ||
8157 | if (!ptr) | |
8158 | return; | |
2b188cc1 | 8159 | |
52e04ef4 | 8160 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8161 | if (put_page_testzero(page)) |
8162 | free_compound_page(page); | |
8163 | } | |
8164 | ||
8165 | static void *io_mem_alloc(size_t size) | |
8166 | { | |
8167 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8168 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8169 | |
8170 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8171 | } | |
8172 | ||
75b28aff HV |
8173 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8174 | size_t *sq_offset) | |
8175 | { | |
8176 | struct io_rings *rings; | |
8177 | size_t off, sq_array_size; | |
8178 | ||
8179 | off = struct_size(rings, cqes, cq_entries); | |
8180 | if (off == SIZE_MAX) | |
8181 | return SIZE_MAX; | |
8182 | ||
8183 | #ifdef CONFIG_SMP | |
8184 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8185 | if (off == 0) | |
8186 | return SIZE_MAX; | |
8187 | #endif | |
8188 | ||
b36200f5 DV |
8189 | if (sq_offset) |
8190 | *sq_offset = off; | |
8191 | ||
75b28aff HV |
8192 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8193 | if (sq_array_size == SIZE_MAX) | |
8194 | return SIZE_MAX; | |
8195 | ||
8196 | if (check_add_overflow(off, sq_array_size, &off)) | |
8197 | return SIZE_MAX; | |
8198 | ||
75b28aff HV |
8199 | return off; |
8200 | } | |
8201 | ||
41edf1a5 | 8202 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8203 | { |
41edf1a5 | 8204 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8205 | unsigned int i; |
8206 | ||
6224843d PB |
8207 | if (imu != ctx->dummy_ubuf) { |
8208 | for (i = 0; i < imu->nr_bvecs; i++) | |
8209 | unpin_user_page(imu->bvec[i].bv_page); | |
8210 | if (imu->acct_pages) | |
8211 | io_unaccount_mem(ctx, imu->acct_pages); | |
8212 | kvfree(imu); | |
8213 | } | |
41edf1a5 | 8214 | *slot = NULL; |
7f61a1e9 PB |
8215 | } |
8216 | ||
bd54b6fe | 8217 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8218 | { |
634d00df PB |
8219 | io_buffer_unmap(ctx, &prsrc->buf); |
8220 | prsrc->buf = NULL; | |
bd54b6fe | 8221 | } |
edafccee | 8222 | |
bd54b6fe BM |
8223 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8224 | { | |
8225 | unsigned int i; | |
edafccee | 8226 | |
7f61a1e9 PB |
8227 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8228 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8229 | kfree(ctx->user_bufs); |
bb6659cc | 8230 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8231 | ctx->user_bufs = NULL; |
bd54b6fe | 8232 | ctx->buf_data = NULL; |
edafccee | 8233 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8234 | } |
8235 | ||
0a96bbe4 | 8236 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8237 | { |
bd54b6fe | 8238 | int ret; |
edafccee | 8239 | |
bd54b6fe | 8240 | if (!ctx->buf_data) |
edafccee JA |
8241 | return -ENXIO; |
8242 | ||
bd54b6fe BM |
8243 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8244 | if (!ret) | |
8245 | __io_sqe_buffers_unregister(ctx); | |
8246 | return ret; | |
edafccee JA |
8247 | } |
8248 | ||
8249 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8250 | void __user *arg, unsigned index) | |
8251 | { | |
8252 | struct iovec __user *src; | |
8253 | ||
8254 | #ifdef CONFIG_COMPAT | |
8255 | if (ctx->compat) { | |
8256 | struct compat_iovec __user *ciovs; | |
8257 | struct compat_iovec ciov; | |
8258 | ||
8259 | ciovs = (struct compat_iovec __user *) arg; | |
8260 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8261 | return -EFAULT; | |
8262 | ||
d55e5f5b | 8263 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8264 | dst->iov_len = ciov.iov_len; |
8265 | return 0; | |
8266 | } | |
8267 | #endif | |
8268 | src = (struct iovec __user *) arg; | |
8269 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8270 | return -EFAULT; | |
8271 | return 0; | |
8272 | } | |
8273 | ||
de293938 JA |
8274 | /* |
8275 | * Not super efficient, but this is just a registration time. And we do cache | |
8276 | * the last compound head, so generally we'll only do a full search if we don't | |
8277 | * match that one. | |
8278 | * | |
8279 | * We check if the given compound head page has already been accounted, to | |
8280 | * avoid double accounting it. This allows us to account the full size of the | |
8281 | * page, not just the constituent pages of a huge page. | |
8282 | */ | |
8283 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8284 | int nr_pages, struct page *hpage) | |
8285 | { | |
8286 | int i, j; | |
8287 | ||
8288 | /* check current page array */ | |
8289 | for (i = 0; i < nr_pages; i++) { | |
8290 | if (!PageCompound(pages[i])) | |
8291 | continue; | |
8292 | if (compound_head(pages[i]) == hpage) | |
8293 | return true; | |
8294 | } | |
8295 | ||
8296 | /* check previously registered pages */ | |
8297 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8298 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8299 | |
8300 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8301 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8302 | continue; | |
8303 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8304 | return true; | |
8305 | } | |
8306 | } | |
8307 | ||
8308 | return false; | |
8309 | } | |
8310 | ||
8311 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8312 | int nr_pages, struct io_mapped_ubuf *imu, | |
8313 | struct page **last_hpage) | |
8314 | { | |
8315 | int i, ret; | |
8316 | ||
216e5835 | 8317 | imu->acct_pages = 0; |
de293938 JA |
8318 | for (i = 0; i < nr_pages; i++) { |
8319 | if (!PageCompound(pages[i])) { | |
8320 | imu->acct_pages++; | |
8321 | } else { | |
8322 | struct page *hpage; | |
8323 | ||
8324 | hpage = compound_head(pages[i]); | |
8325 | if (hpage == *last_hpage) | |
8326 | continue; | |
8327 | *last_hpage = hpage; | |
8328 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8329 | continue; | |
8330 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8331 | } | |
8332 | } | |
8333 | ||
8334 | if (!imu->acct_pages) | |
8335 | return 0; | |
8336 | ||
26bfa89e | 8337 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8338 | if (ret) |
8339 | imu->acct_pages = 0; | |
8340 | return ret; | |
8341 | } | |
8342 | ||
0a96bbe4 | 8343 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8344 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8345 | struct page **last_hpage) |
edafccee | 8346 | { |
41edf1a5 | 8347 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8348 | struct vm_area_struct **vmas = NULL; |
8349 | struct page **pages = NULL; | |
0a96bbe4 BM |
8350 | unsigned long off, start, end, ubuf; |
8351 | size_t size; | |
8352 | int ret, pret, nr_pages, i; | |
8353 | ||
6224843d PB |
8354 | if (!iov->iov_base) { |
8355 | *pimu = ctx->dummy_ubuf; | |
8356 | return 0; | |
8357 | } | |
8358 | ||
0a96bbe4 BM |
8359 | ubuf = (unsigned long) iov->iov_base; |
8360 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8361 | start = ubuf >> PAGE_SHIFT; | |
8362 | nr_pages = end - start; | |
8363 | ||
41edf1a5 | 8364 | *pimu = NULL; |
0a96bbe4 BM |
8365 | ret = -ENOMEM; |
8366 | ||
8367 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8368 | if (!pages) | |
8369 | goto done; | |
8370 | ||
8371 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8372 | GFP_KERNEL); | |
8373 | if (!vmas) | |
8374 | goto done; | |
edafccee | 8375 | |
41edf1a5 | 8376 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8377 | if (!imu) |
0a96bbe4 BM |
8378 | goto done; |
8379 | ||
8380 | ret = 0; | |
8381 | mmap_read_lock(current->mm); | |
8382 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8383 | pages, vmas); | |
8384 | if (pret == nr_pages) { | |
8385 | /* don't support file backed memory */ | |
8386 | for (i = 0; i < nr_pages; i++) { | |
8387 | struct vm_area_struct *vma = vmas[i]; | |
8388 | ||
40dad765 PB |
8389 | if (vma_is_shmem(vma)) |
8390 | continue; | |
0a96bbe4 BM |
8391 | if (vma->vm_file && |
8392 | !is_file_hugepages(vma->vm_file)) { | |
8393 | ret = -EOPNOTSUPP; | |
8394 | break; | |
8395 | } | |
8396 | } | |
8397 | } else { | |
8398 | ret = pret < 0 ? pret : -EFAULT; | |
8399 | } | |
8400 | mmap_read_unlock(current->mm); | |
8401 | if (ret) { | |
8402 | /* | |
8403 | * if we did partial map, or found file backed vmas, | |
8404 | * release any pages we did get | |
8405 | */ | |
8406 | if (pret > 0) | |
8407 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8408 | goto done; |
8409 | } | |
8410 | ||
8411 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8412 | if (ret) { | |
8413 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8414 | goto done; |
8415 | } | |
8416 | ||
8417 | off = ubuf & ~PAGE_MASK; | |
8418 | size = iov->iov_len; | |
8419 | for (i = 0; i < nr_pages; i++) { | |
8420 | size_t vec_len; | |
8421 | ||
8422 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8423 | imu->bvec[i].bv_page = pages[i]; | |
8424 | imu->bvec[i].bv_len = vec_len; | |
8425 | imu->bvec[i].bv_offset = off; | |
8426 | off = 0; | |
8427 | size -= vec_len; | |
8428 | } | |
8429 | /* store original address for later verification */ | |
8430 | imu->ubuf = ubuf; | |
4751f53d | 8431 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8432 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8433 | *pimu = imu; |
0a96bbe4 BM |
8434 | ret = 0; |
8435 | done: | |
41edf1a5 PB |
8436 | if (ret) |
8437 | kvfree(imu); | |
0a96bbe4 BM |
8438 | kvfree(pages); |
8439 | kvfree(vmas); | |
8440 | return ret; | |
8441 | } | |
8442 | ||
2b358604 | 8443 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8444 | { |
87094465 PB |
8445 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8446 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 8447 | } |
edafccee | 8448 | |
2b358604 BM |
8449 | static int io_buffer_validate(struct iovec *iov) |
8450 | { | |
50e96989 PB |
8451 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
8452 | ||
2b358604 BM |
8453 | /* |
8454 | * Don't impose further limits on the size and buffer | |
8455 | * constraints here, we'll -EINVAL later when IO is | |
8456 | * submitted if they are wrong. | |
8457 | */ | |
6224843d PB |
8458 | if (!iov->iov_base) |
8459 | return iov->iov_len ? -EFAULT : 0; | |
8460 | if (!iov->iov_len) | |
2b358604 | 8461 | return -EFAULT; |
edafccee | 8462 | |
2b358604 BM |
8463 | /* arbitrary limit, but we need something */ |
8464 | if (iov->iov_len > SZ_1G) | |
8465 | return -EFAULT; | |
edafccee | 8466 | |
50e96989 PB |
8467 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
8468 | return -EOVERFLOW; | |
8469 | ||
2b358604 BM |
8470 | return 0; |
8471 | } | |
edafccee | 8472 | |
2b358604 | 8473 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 8474 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 8475 | { |
bd54b6fe BM |
8476 | struct page *last_hpage = NULL; |
8477 | struct io_rsrc_data *data; | |
2b358604 BM |
8478 | int i, ret; |
8479 | struct iovec iov; | |
edafccee | 8480 | |
87094465 PB |
8481 | if (ctx->user_bufs) |
8482 | return -EBUSY; | |
489809e2 | 8483 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 8484 | return -EINVAL; |
bd54b6fe | 8485 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
8486 | if (ret) |
8487 | return ret; | |
d878c816 PB |
8488 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
8489 | if (ret) | |
8490 | return ret; | |
bd54b6fe BM |
8491 | ret = io_buffers_map_alloc(ctx, nr_args); |
8492 | if (ret) { | |
bb6659cc | 8493 | io_rsrc_data_free(data); |
bd54b6fe BM |
8494 | return ret; |
8495 | } | |
edafccee | 8496 | |
87094465 | 8497 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
8498 | ret = io_copy_iov(ctx, &iov, arg, i); |
8499 | if (ret) | |
0a96bbe4 | 8500 | break; |
2b358604 BM |
8501 | ret = io_buffer_validate(&iov); |
8502 | if (ret) | |
0a96bbe4 | 8503 | break; |
2d091d62 | 8504 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
8505 | ret = -EINVAL; |
8506 | break; | |
8507 | } | |
edafccee | 8508 | |
41edf1a5 PB |
8509 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
8510 | &last_hpage); | |
0a96bbe4 BM |
8511 | if (ret) |
8512 | break; | |
edafccee | 8513 | } |
0a96bbe4 | 8514 | |
bd54b6fe | 8515 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 8516 | |
bd54b6fe BM |
8517 | ctx->buf_data = data; |
8518 | if (ret) | |
8519 | __io_sqe_buffers_unregister(ctx); | |
8520 | else | |
8521 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
8522 | return ret; |
8523 | } | |
8524 | ||
634d00df PB |
8525 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
8526 | struct io_uring_rsrc_update2 *up, | |
8527 | unsigned int nr_args) | |
8528 | { | |
8529 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
8530 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
8531 | struct page *last_hpage = NULL; |
8532 | bool needs_switch = false; | |
8533 | __u32 done; | |
8534 | int i, err; | |
8535 | ||
8536 | if (!ctx->buf_data) | |
8537 | return -ENXIO; | |
8538 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
8539 | return -EINVAL; | |
8540 | ||
8541 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
8542 | struct io_mapped_ubuf *imu; |
8543 | int offset = up->offset + done; | |
634d00df PB |
8544 | u64 tag = 0; |
8545 | ||
8546 | err = io_copy_iov(ctx, &iov, iovs, done); | |
8547 | if (err) | |
8548 | break; | |
8549 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
8550 | err = -EFAULT; | |
8551 | break; | |
8552 | } | |
0b8c0e7c PB |
8553 | err = io_buffer_validate(&iov); |
8554 | if (err) | |
8555 | break; | |
cf3770e7 CIK |
8556 | if (!iov.iov_base && tag) { |
8557 | err = -EINVAL; | |
8558 | break; | |
8559 | } | |
0b8c0e7c PB |
8560 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
8561 | if (err) | |
8562 | break; | |
634d00df | 8563 | |
0b8c0e7c | 8564 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 8565 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
8566 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
8567 | ctx->rsrc_node, ctx->user_bufs[i]); | |
8568 | if (unlikely(err)) { | |
8569 | io_buffer_unmap(ctx, &imu); | |
634d00df | 8570 | break; |
0b8c0e7c | 8571 | } |
634d00df PB |
8572 | ctx->user_bufs[i] = NULL; |
8573 | needs_switch = true; | |
8574 | } | |
8575 | ||
0b8c0e7c | 8576 | ctx->user_bufs[i] = imu; |
2d091d62 | 8577 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
8578 | } |
8579 | ||
8580 | if (needs_switch) | |
8581 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
8582 | return done ? done : err; | |
8583 | } | |
8584 | ||
9b402849 JA |
8585 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8586 | { | |
8587 | __s32 __user *fds = arg; | |
8588 | int fd; | |
8589 | ||
8590 | if (ctx->cq_ev_fd) | |
8591 | return -EBUSY; | |
8592 | ||
8593 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8594 | return -EFAULT; | |
8595 | ||
8596 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8597 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8598 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 8599 | |
9b402849 JA |
8600 | ctx->cq_ev_fd = NULL; |
8601 | return ret; | |
8602 | } | |
8603 | ||
8604 | return 0; | |
8605 | } | |
8606 | ||
8607 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8608 | { | |
8609 | if (ctx->cq_ev_fd) { | |
8610 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8611 | ctx->cq_ev_fd = NULL; | |
8612 | return 0; | |
8613 | } | |
8614 | ||
8615 | return -ENXIO; | |
8616 | } | |
8617 | ||
5a2e745d JA |
8618 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
8619 | { | |
9e15c3a0 JA |
8620 | struct io_buffer *buf; |
8621 | unsigned long index; | |
8622 | ||
8623 | xa_for_each(&ctx->io_buffers, index, buf) | |
8624 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
8625 | } |
8626 | ||
68e68ee6 | 8627 | static void io_req_cache_free(struct list_head *list, struct task_struct *tsk) |
1b4c351f | 8628 | { |
68e68ee6 | 8629 | struct io_kiocb *req, *nxt; |
1b4c351f | 8630 | |
68e68ee6 JA |
8631 | list_for_each_entry_safe(req, nxt, list, compl.list) { |
8632 | if (tsk && req->task != tsk) | |
8633 | continue; | |
1b4c351f JA |
8634 | list_del(&req->compl.list); |
8635 | kmem_cache_free(req_cachep, req); | |
8636 | } | |
8637 | } | |
8638 | ||
4010fec4 | 8639 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 8640 | { |
bf019da7 | 8641 | struct io_submit_state *submit_state = &ctx->submit_state; |
e5547d2c | 8642 | struct io_comp_state *cs = &ctx->submit_state.comp; |
bf019da7 | 8643 | |
9a4fdbd8 JA |
8644 | mutex_lock(&ctx->uring_lock); |
8645 | ||
8e5c66c4 | 8646 | if (submit_state->free_reqs) { |
9a4fdbd8 JA |
8647 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, |
8648 | submit_state->reqs); | |
8e5c66c4 PB |
8649 | submit_state->free_reqs = 0; |
8650 | } | |
9a4fdbd8 | 8651 | |
dac7a098 | 8652 | io_flush_cached_locked_reqs(ctx, cs); |
e5547d2c | 8653 | io_req_cache_free(&cs->free_list, NULL); |
9a4fdbd8 JA |
8654 | mutex_unlock(&ctx->uring_lock); |
8655 | } | |
8656 | ||
43597aac | 8657 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 8658 | { |
43597aac | 8659 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 8660 | wait_for_completion(&data->done); |
bd54b6fe | 8661 | } |
04fc6c80 | 8662 | |
2b188cc1 JA |
8663 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8664 | { | |
37d1e2e3 | 8665 | io_sq_thread_finish(ctx); |
2aede0e4 | 8666 | |
37d1e2e3 | 8667 | if (ctx->mm_account) { |
2aede0e4 JA |
8668 | mmdrop(ctx->mm_account); |
8669 | ctx->mm_account = NULL; | |
30975825 | 8670 | } |
def596e9 | 8671 | |
43597aac PB |
8672 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
8673 | io_wait_rsrc_data(ctx->buf_data); | |
8674 | io_wait_rsrc_data(ctx->file_data); | |
8675 | ||
8bad28d8 | 8676 | mutex_lock(&ctx->uring_lock); |
43597aac | 8677 | if (ctx->buf_data) |
bd54b6fe | 8678 | __io_sqe_buffers_unregister(ctx); |
43597aac | 8679 | if (ctx->file_data) |
08480400 | 8680 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
8681 | if (ctx->rings) |
8682 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 8683 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 8684 | io_eventfd_unregister(ctx); |
5a2e745d | 8685 | io_destroy_buffers(ctx); |
07db298a PB |
8686 | if (ctx->sq_creds) |
8687 | put_cred(ctx->sq_creds); | |
def596e9 | 8688 | |
a7f0ed5a PB |
8689 | /* there are no registered resources left, nobody uses it */ |
8690 | if (ctx->rsrc_node) | |
8691 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 8692 | if (ctx->rsrc_backup_node) |
b895c9a6 | 8693 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
8694 | flush_delayed_work(&ctx->rsrc_put_work); |
8695 | ||
8696 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
8697 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 8698 | |
2b188cc1 | 8699 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8700 | if (ctx->ring_sock) { |
8701 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8702 | sock_release(ctx->ring_sock); |
355e8d26 | 8703 | } |
2b188cc1 JA |
8704 | #endif |
8705 | ||
75b28aff | 8706 | io_mem_free(ctx->rings); |
2b188cc1 | 8707 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8708 | |
8709 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8710 | free_uid(ctx->user); |
4010fec4 | 8711 | io_req_caches_free(ctx); |
e941894e JA |
8712 | if (ctx->hash_map) |
8713 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 8714 | kfree(ctx->cancel_hash); |
6224843d | 8715 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
8716 | kfree(ctx); |
8717 | } | |
8718 | ||
8719 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8720 | { | |
8721 | struct io_ring_ctx *ctx = file->private_data; | |
8722 | __poll_t mask = 0; | |
8723 | ||
311997b3 | 8724 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
8725 | /* |
8726 | * synchronizes with barrier from wq_has_sleeper call in | |
8727 | * io_commit_cqring | |
8728 | */ | |
2b188cc1 | 8729 | smp_rmb(); |
90554200 | 8730 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8731 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8732 | |
8733 | /* | |
8734 | * Don't flush cqring overflow list here, just do a simple check. | |
8735 | * Otherwise there could possible be ABBA deadlock: | |
8736 | * CPU0 CPU1 | |
8737 | * ---- ---- | |
8738 | * lock(&ctx->uring_lock); | |
8739 | * lock(&ep->mtx); | |
8740 | * lock(&ctx->uring_lock); | |
8741 | * lock(&ep->mtx); | |
8742 | * | |
8743 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8744 | * pushs them to do the flush. | |
8745 | */ | |
5ed7a37d | 8746 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
8747 | mask |= EPOLLIN | EPOLLRDNORM; |
8748 | ||
8749 | return mask; | |
8750 | } | |
8751 | ||
8752 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8753 | { | |
8754 | struct io_ring_ctx *ctx = file->private_data; | |
8755 | ||
8756 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8757 | } | |
8758 | ||
0bead8cd | 8759 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8760 | { |
4379bf8b | 8761 | const struct cred *creds; |
071698e1 | 8762 | |
61cf9370 | 8763 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
8764 | if (creds) { |
8765 | put_cred(creds); | |
0bead8cd | 8766 | return 0; |
1e6fa521 | 8767 | } |
0bead8cd YD |
8768 | |
8769 | return -EINVAL; | |
8770 | } | |
8771 | ||
d56d938b PB |
8772 | struct io_tctx_exit { |
8773 | struct callback_head task_work; | |
8774 | struct completion completion; | |
baf186c4 | 8775 | struct io_ring_ctx *ctx; |
d56d938b PB |
8776 | }; |
8777 | ||
8778 | static void io_tctx_exit_cb(struct callback_head *cb) | |
8779 | { | |
8780 | struct io_uring_task *tctx = current->io_uring; | |
8781 | struct io_tctx_exit *work; | |
8782 | ||
8783 | work = container_of(cb, struct io_tctx_exit, task_work); | |
8784 | /* | |
8785 | * When @in_idle, we're in cancellation and it's racy to remove the | |
8786 | * node. It'll be removed by the end of cancellation, just ignore it. | |
8787 | */ | |
8788 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 8789 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
8790 | complete(&work->completion); |
8791 | } | |
8792 | ||
28090c13 PB |
8793 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8794 | { | |
8795 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8796 | ||
8797 | return req->ctx == data; | |
8798 | } | |
8799 | ||
85faa7b8 JA |
8800 | static void io_ring_exit_work(struct work_struct *work) |
8801 | { | |
d56d938b | 8802 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 8803 | unsigned long timeout = jiffies + HZ * 60 * 5; |
d56d938b PB |
8804 | struct io_tctx_exit exit; |
8805 | struct io_tctx_node *node; | |
8806 | int ret; | |
85faa7b8 | 8807 | |
56952e91 JA |
8808 | /* |
8809 | * If we're doing polled IO and end up having requests being | |
8810 | * submitted async (out-of-line), then completions can come in while | |
8811 | * we're waiting for refs to drop. We need to reap these manually, | |
8812 | * as nobody else will be looking for them. | |
8813 | */ | |
b2edc0a7 | 8814 | do { |
3dd0c97a | 8815 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
8816 | if (ctx->sq_data) { |
8817 | struct io_sq_data *sqd = ctx->sq_data; | |
8818 | struct task_struct *tsk; | |
8819 | ||
8820 | io_sq_thread_park(sqd); | |
8821 | tsk = sqd->thread; | |
8822 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
8823 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
8824 | io_cancel_ctx_cb, ctx, true); | |
8825 | io_sq_thread_unpark(sqd); | |
8826 | } | |
b5bb3a24 PB |
8827 | |
8828 | WARN_ON_ONCE(time_after(jiffies, timeout)); | |
b2edc0a7 | 8829 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
d56d938b | 8830 | |
7f00651a PB |
8831 | init_completion(&exit.completion); |
8832 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
8833 | exit.ctx = ctx; | |
89b5066e PB |
8834 | /* |
8835 | * Some may use context even when all refs and requests have been put, | |
8836 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 8837 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
8838 | * this lock/unlock section also waits them to finish. |
8839 | */ | |
d56d938b PB |
8840 | mutex_lock(&ctx->uring_lock); |
8841 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
8842 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
8843 | ||
d56d938b PB |
8844 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
8845 | ctx_node); | |
7f00651a PB |
8846 | /* don't spin on a single task if cancellation failed */ |
8847 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
8848 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
8849 | if (WARN_ON_ONCE(ret)) | |
8850 | continue; | |
8851 | wake_up_process(node->task); | |
8852 | ||
8853 | mutex_unlock(&ctx->uring_lock); | |
8854 | wait_for_completion(&exit.completion); | |
d56d938b PB |
8855 | mutex_lock(&ctx->uring_lock); |
8856 | } | |
8857 | mutex_unlock(&ctx->uring_lock); | |
89b5066e PB |
8858 | spin_lock_irq(&ctx->completion_lock); |
8859 | spin_unlock_irq(&ctx->completion_lock); | |
d56d938b | 8860 | |
85faa7b8 JA |
8861 | io_ring_ctx_free(ctx); |
8862 | } | |
8863 | ||
80c4cbdb PB |
8864 | /* Returns true if we found and killed one or more timeouts */ |
8865 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 8866 | bool cancel_all) |
80c4cbdb PB |
8867 | { |
8868 | struct io_kiocb *req, *tmp; | |
8869 | int canceled = 0; | |
8870 | ||
8871 | spin_lock_irq(&ctx->completion_lock); | |
8872 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { | |
3dd0c97a | 8873 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
8874 | io_kill_timeout(req, -ECANCELED); |
8875 | canceled++; | |
8876 | } | |
8877 | } | |
51520426 PB |
8878 | if (canceled != 0) |
8879 | io_commit_cqring(ctx); | |
80c4cbdb | 8880 | spin_unlock_irq(&ctx->completion_lock); |
80c4cbdb PB |
8881 | if (canceled != 0) |
8882 | io_cqring_ev_posted(ctx); | |
8883 | return canceled != 0; | |
8884 | } | |
8885 | ||
2b188cc1 JA |
8886 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8887 | { | |
61cf9370 MWO |
8888 | unsigned long index; |
8889 | struct creds *creds; | |
8890 | ||
2b188cc1 JA |
8891 | mutex_lock(&ctx->uring_lock); |
8892 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 8893 | if (ctx->rings) |
6c2450ae | 8894 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
8895 | xa_for_each(&ctx->personalities, index, creds) |
8896 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
8897 | mutex_unlock(&ctx->uring_lock); |
8898 | ||
3dd0c97a PB |
8899 | io_kill_timeouts(ctx, NULL, true); |
8900 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 8901 | |
15dff286 | 8902 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8903 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8904 | |
85faa7b8 | 8905 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8906 | /* |
8907 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8908 | * if we're exiting a ton of rings at the same time. It just adds | |
8909 | * noise and overhead, there's no discernable change in runtime | |
8910 | * over using system_wq. | |
8911 | */ | |
8912 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8913 | } |
8914 | ||
8915 | static int io_uring_release(struct inode *inode, struct file *file) | |
8916 | { | |
8917 | struct io_ring_ctx *ctx = file->private_data; | |
8918 | ||
8919 | file->private_data = NULL; | |
8920 | io_ring_ctx_wait_and_kill(ctx); | |
8921 | return 0; | |
8922 | } | |
8923 | ||
f6edbabb PB |
8924 | struct io_task_cancel { |
8925 | struct task_struct *task; | |
3dd0c97a | 8926 | bool all; |
f6edbabb | 8927 | }; |
f254ac04 | 8928 | |
f6edbabb | 8929 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8930 | { |
9a472ef7 | 8931 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8932 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8933 | bool ret; |
8934 | ||
3dd0c97a | 8935 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8936 | unsigned long flags; |
8937 | struct io_ring_ctx *ctx = req->ctx; | |
8938 | ||
8939 | /* protect against races with linked timeouts */ | |
8940 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
3dd0c97a | 8941 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8942 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8943 | } else { | |
3dd0c97a | 8944 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8945 | } |
8946 | return ret; | |
b711d4ea JA |
8947 | } |
8948 | ||
e1915f76 | 8949 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 8950 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 8951 | { |
e1915f76 | 8952 | struct io_defer_entry *de; |
b7ddce3c PB |
8953 | LIST_HEAD(list); |
8954 | ||
8955 | spin_lock_irq(&ctx->completion_lock); | |
8956 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
3dd0c97a | 8957 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
8958 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8959 | break; | |
8960 | } | |
8961 | } | |
8962 | spin_unlock_irq(&ctx->completion_lock); | |
e1915f76 PB |
8963 | if (list_empty(&list)) |
8964 | return false; | |
b7ddce3c PB |
8965 | |
8966 | while (!list_empty(&list)) { | |
8967 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8968 | list_del_init(&de->list); | |
f41db273 | 8969 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
8970 | kfree(de); |
8971 | } | |
e1915f76 | 8972 | return true; |
b7ddce3c PB |
8973 | } |
8974 | ||
1b00764f PB |
8975 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
8976 | { | |
8977 | struct io_tctx_node *node; | |
8978 | enum io_wq_cancel cret; | |
8979 | bool ret = false; | |
8980 | ||
8981 | mutex_lock(&ctx->uring_lock); | |
8982 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
8983 | struct io_uring_task *tctx = node->task->io_uring; | |
8984 | ||
8985 | /* | |
8986 | * io_wq will stay alive while we hold uring_lock, because it's | |
8987 | * killed after ctx nodes, which requires to take the lock. | |
8988 | */ | |
8989 | if (!tctx || !tctx->io_wq) | |
8990 | continue; | |
8991 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
8992 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8993 | } | |
8994 | mutex_unlock(&ctx->uring_lock); | |
8995 | ||
8996 | return ret; | |
8997 | } | |
8998 | ||
9936c7c2 PB |
8999 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9000 | struct task_struct *task, | |
3dd0c97a | 9001 | bool cancel_all) |
9936c7c2 | 9002 | { |
3dd0c97a | 9003 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9004 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9005 | |
9006 | while (1) { | |
9007 | enum io_wq_cancel cret; | |
9008 | bool ret = false; | |
9009 | ||
1b00764f PB |
9010 | if (!task) { |
9011 | ret |= io_uring_try_cancel_iowq(ctx); | |
9012 | } else if (tctx && tctx->io_wq) { | |
9013 | /* | |
9014 | * Cancels requests of all rings, not only @ctx, but | |
9015 | * it's fine as the task is in exit/exec. | |
9016 | */ | |
5aa75ed5 | 9017 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9018 | &cancel, true); |
9019 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9020 | } | |
9021 | ||
9022 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9023 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9024 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9025 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9026 | io_iopoll_try_reap_events(ctx); | |
9027 | ret = true; | |
9028 | } | |
9029 | } | |
9030 | ||
3dd0c97a PB |
9031 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9032 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9033 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9034 | if (task) |
9035 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9036 | if (!ret) |
9037 | break; | |
9038 | cond_resched(); | |
9039 | } | |
9040 | } | |
9041 | ||
eef51daa | 9042 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9043 | { |
236434c3 | 9044 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9045 | struct io_tctx_node *node; |
a528b04e | 9046 | int ret; |
236434c3 MWO |
9047 | |
9048 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9049 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9050 | if (unlikely(ret)) |
9051 | return ret; | |
236434c3 | 9052 | tctx = current->io_uring; |
0f212204 | 9053 | } |
cf27f3b1 PB |
9054 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9055 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9056 | if (!node) | |
9057 | return -ENOMEM; | |
9058 | node->ctx = ctx; | |
9059 | node->task = current; | |
13bf43f5 | 9060 | |
cf27f3b1 PB |
9061 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9062 | node, GFP_KERNEL)); | |
9063 | if (ret) { | |
9064 | kfree(node); | |
9065 | return ret; | |
0f212204 | 9066 | } |
cf27f3b1 PB |
9067 | |
9068 | mutex_lock(&ctx->uring_lock); | |
9069 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9070 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9071 | } |
cf27f3b1 | 9072 | tctx->last = ctx; |
0f212204 JA |
9073 | return 0; |
9074 | } | |
9075 | ||
cf27f3b1 PB |
9076 | /* |
9077 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9078 | */ | |
eef51daa | 9079 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9080 | { |
9081 | struct io_uring_task *tctx = current->io_uring; | |
9082 | ||
9083 | if (likely(tctx && tctx->last == ctx)) | |
9084 | return 0; | |
eef51daa | 9085 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9086 | } |
9087 | ||
0f212204 JA |
9088 | /* |
9089 | * Remove this io_uring_file -> task mapping. | |
9090 | */ | |
eef51daa | 9091 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9092 | { |
9093 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9094 | struct io_tctx_node *node; |
2941267b | 9095 | |
eebd2e37 PB |
9096 | if (!tctx) |
9097 | return; | |
13bf43f5 PB |
9098 | node = xa_erase(&tctx->xa, index); |
9099 | if (!node) | |
2941267b | 9100 | return; |
0f212204 | 9101 | |
13bf43f5 PB |
9102 | WARN_ON_ONCE(current != node->task); |
9103 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9104 | ||
9105 | mutex_lock(&node->ctx->uring_lock); | |
9106 | list_del(&node->ctx_node); | |
9107 | mutex_unlock(&node->ctx->uring_lock); | |
9108 | ||
baf186c4 | 9109 | if (tctx->last == node->ctx) |
0f212204 | 9110 | tctx->last = NULL; |
13bf43f5 | 9111 | kfree(node); |
0f212204 JA |
9112 | } |
9113 | ||
8452d4a6 | 9114 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9115 | { |
ba5ef6dc | 9116 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9117 | struct io_tctx_node *node; |
de7f1d9e PB |
9118 | unsigned long index; |
9119 | ||
13bf43f5 | 9120 | xa_for_each(&tctx->xa, index, node) |
eef51daa | 9121 | io_uring_del_tctx_node(index); |
b16ef427 ME |
9122 | if (wq) { |
9123 | /* | |
9124 | * Must be after io_uring_del_task_file() (removes nodes under | |
9125 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9126 | */ | |
9127 | tctx->io_wq = NULL; | |
ba5ef6dc | 9128 | io_wq_put_and_exit(wq); |
b16ef427 | 9129 | } |
de7f1d9e PB |
9130 | } |
9131 | ||
3f48cf18 | 9132 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9133 | { |
3f48cf18 PB |
9134 | if (tracked) |
9135 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9136 | return percpu_counter_sum(&tctx->inflight); |
9137 | } | |
9138 | ||
09899b19 PB |
9139 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9140 | { | |
9141 | struct io_uring_task *tctx = task->io_uring; | |
9142 | unsigned int refs = tctx->cached_refs; | |
9143 | ||
9144 | tctx->cached_refs = 0; | |
9145 | percpu_counter_sub(&tctx->inflight, refs); | |
9146 | put_task_struct_many(task, refs); | |
9147 | } | |
9148 | ||
78cc687b PB |
9149 | /* |
9150 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9151 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9152 | */ | |
9153 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9154 | { |
521d6a73 | 9155 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9156 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9157 | s64 inflight; |
9158 | DEFINE_WAIT(wait); | |
fdaf083c | 9159 | |
78cc687b PB |
9160 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9161 | ||
6d042ffb PO |
9162 | if (!current->io_uring) |
9163 | return; | |
17a91051 PB |
9164 | if (tctx->io_wq) |
9165 | io_wq_exit_start(tctx->io_wq); | |
9166 | ||
09899b19 | 9167 | io_uring_drop_tctx_refs(current); |
0e9ddb39 PB |
9168 | atomic_inc(&tctx->in_idle); |
9169 | do { | |
9170 | /* read completions before cancelations */ | |
78cc687b | 9171 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9172 | if (!inflight) |
9173 | break; | |
fdaf083c | 9174 | |
78cc687b PB |
9175 | if (!sqd) { |
9176 | struct io_tctx_node *node; | |
9177 | unsigned long index; | |
0f212204 | 9178 | |
78cc687b PB |
9179 | xa_for_each(&tctx->xa, index, node) { |
9180 | /* sqpoll task will cancel all its requests */ | |
9181 | if (node->ctx->sq_data) | |
9182 | continue; | |
9183 | io_uring_try_cancel_requests(node->ctx, current, | |
9184 | cancel_all); | |
9185 | } | |
9186 | } else { | |
9187 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9188 | io_uring_try_cancel_requests(ctx, current, | |
9189 | cancel_all); | |
9190 | } | |
17a91051 | 9191 | |
0f212204 | 9192 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
0f212204 | 9193 | /* |
a1bb3cd5 PB |
9194 | * If we've seen completions, retry without waiting. This |
9195 | * avoids a race where a completion comes in before we did | |
9196 | * prepare_to_wait(). | |
0f212204 | 9197 | */ |
3dd0c97a | 9198 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9199 | schedule(); |
f57555ed | 9200 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9201 | } while (1); |
fdaf083c | 9202 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9203 | |
8452d4a6 | 9204 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9205 | if (cancel_all) { |
3f48cf18 PB |
9206 | /* for exec all current's requests should be gone, kill tctx */ |
9207 | __io_uring_free(current); | |
9208 | } | |
44e728b8 PB |
9209 | } |
9210 | ||
78cc687b PB |
9211 | void __io_uring_cancel(struct files_struct *files) |
9212 | { | |
9213 | io_uring_cancel_generic(!files, NULL); | |
9214 | } | |
9215 | ||
6c5c240e RP |
9216 | static void *io_uring_validate_mmap_request(struct file *file, |
9217 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9218 | { |
2b188cc1 | 9219 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9220 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9221 | struct page *page; |
9222 | void *ptr; | |
9223 | ||
9224 | switch (offset) { | |
9225 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9226 | case IORING_OFF_CQ_RING: |
9227 | ptr = ctx->rings; | |
2b188cc1 JA |
9228 | break; |
9229 | case IORING_OFF_SQES: | |
9230 | ptr = ctx->sq_sqes; | |
9231 | break; | |
2b188cc1 | 9232 | default: |
6c5c240e | 9233 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9234 | } |
9235 | ||
9236 | page = virt_to_head_page(ptr); | |
a50b854e | 9237 | if (sz > page_size(page)) |
6c5c240e RP |
9238 | return ERR_PTR(-EINVAL); |
9239 | ||
9240 | return ptr; | |
9241 | } | |
9242 | ||
9243 | #ifdef CONFIG_MMU | |
9244 | ||
9245 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9246 | { | |
9247 | size_t sz = vma->vm_end - vma->vm_start; | |
9248 | unsigned long pfn; | |
9249 | void *ptr; | |
9250 | ||
9251 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9252 | if (IS_ERR(ptr)) | |
9253 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9254 | |
9255 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9256 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9257 | } | |
9258 | ||
6c5c240e RP |
9259 | #else /* !CONFIG_MMU */ |
9260 | ||
9261 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9262 | { | |
9263 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9264 | } | |
9265 | ||
9266 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9267 | { | |
9268 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9269 | } | |
9270 | ||
9271 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9272 | unsigned long addr, unsigned long len, | |
9273 | unsigned long pgoff, unsigned long flags) | |
9274 | { | |
9275 | void *ptr; | |
9276 | ||
9277 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9278 | if (IS_ERR(ptr)) | |
9279 | return PTR_ERR(ptr); | |
9280 | ||
9281 | return (unsigned long) ptr; | |
9282 | } | |
9283 | ||
9284 | #endif /* !CONFIG_MMU */ | |
9285 | ||
d9d05217 | 9286 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9287 | { |
9288 | DEFINE_WAIT(wait); | |
9289 | ||
9290 | do { | |
9291 | if (!io_sqring_full(ctx)) | |
9292 | break; | |
90554200 JA |
9293 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9294 | ||
9295 | if (!io_sqring_full(ctx)) | |
9296 | break; | |
90554200 JA |
9297 | schedule(); |
9298 | } while (!signal_pending(current)); | |
9299 | ||
9300 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9301 | return 0; |
90554200 JA |
9302 | } |
9303 | ||
c73ebb68 HX |
9304 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9305 | struct __kernel_timespec __user **ts, | |
9306 | const sigset_t __user **sig) | |
9307 | { | |
9308 | struct io_uring_getevents_arg arg; | |
9309 | ||
9310 | /* | |
9311 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9312 | * is just a pointer to the sigset_t. | |
9313 | */ | |
9314 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9315 | *sig = (const sigset_t __user *) argp; | |
9316 | *ts = NULL; | |
9317 | return 0; | |
9318 | } | |
9319 | ||
9320 | /* | |
9321 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9322 | * timespec and sigset_t pointers if good. | |
9323 | */ | |
9324 | if (*argsz != sizeof(arg)) | |
9325 | return -EINVAL; | |
9326 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9327 | return -EFAULT; | |
9328 | *sig = u64_to_user_ptr(arg.sigmask); | |
9329 | *argsz = arg.sigmask_sz; | |
9330 | *ts = u64_to_user_ptr(arg.ts); | |
9331 | return 0; | |
9332 | } | |
9333 | ||
2b188cc1 | 9334 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9335 | u32, min_complete, u32, flags, const void __user *, argp, |
9336 | size_t, argsz) | |
2b188cc1 JA |
9337 | { |
9338 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9339 | int submitted = 0; |
9340 | struct fd f; | |
33f993da | 9341 | long ret; |
2b188cc1 | 9342 | |
4c6e277c | 9343 | io_run_task_work(); |
b41e9852 | 9344 | |
33f993da PB |
9345 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9346 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9347 | return -EINVAL; |
9348 | ||
9349 | f = fdget(fd); | |
33f993da | 9350 | if (unlikely(!f.file)) |
2b188cc1 JA |
9351 | return -EBADF; |
9352 | ||
9353 | ret = -EOPNOTSUPP; | |
33f993da | 9354 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9355 | goto out_fput; |
9356 | ||
9357 | ret = -ENXIO; | |
9358 | ctx = f.file->private_data; | |
33f993da | 9359 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9360 | goto out_fput; |
9361 | ||
7e84e1c7 | 9362 | ret = -EBADFD; |
33f993da | 9363 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9364 | goto out; |
9365 | ||
6c271ce2 JA |
9366 | /* |
9367 | * For SQ polling, the thread will do all submissions and completions. | |
9368 | * Just return the requested submit count, and wake the thread if | |
9369 | * we were asked to. | |
9370 | */ | |
b2a9eada | 9371 | ret = 0; |
6c271ce2 | 9372 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c2450ae | 9373 | io_cqring_overflow_flush(ctx, false); |
89448c47 | 9374 | |
21f96522 JA |
9375 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9376 | ret = -EOWNERDEAD; | |
04147488 | 9377 | goto out; |
21f96522 | 9378 | } |
6c271ce2 | 9379 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9380 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9381 | if (flags & IORING_ENTER_SQ_WAIT) { |
9382 | ret = io_sqpoll_wait_sq(ctx); | |
9383 | if (ret) | |
9384 | goto out; | |
9385 | } | |
6c271ce2 | 9386 | submitted = to_submit; |
b2a9eada | 9387 | } else if (to_submit) { |
eef51daa | 9388 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9389 | if (unlikely(ret)) |
9390 | goto out; | |
2b188cc1 | 9391 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9392 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9393 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9394 | |
9395 | if (submitted != to_submit) | |
9396 | goto out; | |
2b188cc1 JA |
9397 | } |
9398 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9399 | const sigset_t __user *sig; |
9400 | struct __kernel_timespec __user *ts; | |
9401 | ||
9402 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9403 | if (unlikely(ret)) | |
9404 | goto out; | |
9405 | ||
2b188cc1 JA |
9406 | min_complete = min(min_complete, ctx->cq_entries); |
9407 | ||
32b2244a XW |
9408 | /* |
9409 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9410 | * space applications don't need to do io completion events | |
9411 | * polling again, they can rely on io_sq_thread to do polling | |
9412 | * work, which can reduce cpu usage and uring_lock contention. | |
9413 | */ | |
9414 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9415 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9416 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9417 | } else { |
c73ebb68 | 9418 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9419 | } |
2b188cc1 JA |
9420 | } |
9421 | ||
7c504e65 | 9422 | out: |
6805b32e | 9423 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9424 | out_fput: |
9425 | fdput(f); | |
9426 | return submitted ? submitted : ret; | |
9427 | } | |
9428 | ||
bebdb65e | 9429 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9430 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9431 | const struct cred *cred) | |
87ce955b | 9432 | { |
87ce955b JA |
9433 | struct user_namespace *uns = seq_user_ns(m); |
9434 | struct group_info *gi; | |
9435 | kernel_cap_t cap; | |
9436 | unsigned __capi; | |
9437 | int g; | |
9438 | ||
9439 | seq_printf(m, "%5d\n", id); | |
9440 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9441 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9442 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9443 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9444 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9445 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9446 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9447 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9448 | seq_puts(m, "\n\tGroups:\t"); | |
9449 | gi = cred->group_info; | |
9450 | for (g = 0; g < gi->ngroups; g++) { | |
9451 | seq_put_decimal_ull(m, g ? " " : "", | |
9452 | from_kgid_munged(uns, gi->gid[g])); | |
9453 | } | |
9454 | seq_puts(m, "\n\tCapEff:\t"); | |
9455 | cap = cred->cap_effective; | |
9456 | CAP_FOR_EACH_U32(__capi) | |
9457 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9458 | seq_putc(m, '\n'); | |
9459 | return 0; | |
9460 | } | |
9461 | ||
9462 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9463 | { | |
dbbe9c64 | 9464 | struct io_sq_data *sq = NULL; |
fad8e0de | 9465 | bool has_lock; |
87ce955b JA |
9466 | int i; |
9467 | ||
fad8e0de JA |
9468 | /* |
9469 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9470 | * since fdinfo case grabs it in the opposite direction of normal use | |
9471 | * cases. If we fail to get the lock, we just don't iterate any | |
9472 | * structures that could be going away outside the io_uring mutex. | |
9473 | */ | |
9474 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9475 | ||
5f3f26f9 | 9476 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9477 | sq = ctx->sq_data; |
5f3f26f9 JA |
9478 | if (!sq->thread) |
9479 | sq = NULL; | |
9480 | } | |
dbbe9c64 JQ |
9481 | |
9482 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9483 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9484 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9485 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9486 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9487 | |
87ce955b JA |
9488 | if (f) |
9489 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9490 | else | |
9491 | seq_printf(m, "%5u: <none>\n", i); | |
9492 | } | |
9493 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9494 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 9495 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 9496 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 9497 | |
4751f53d | 9498 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 9499 | } |
61cf9370 MWO |
9500 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9501 | unsigned long index; | |
9502 | const struct cred *cred; | |
9503 | ||
87ce955b | 9504 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9505 | xa_for_each(&ctx->personalities, index, cred) |
9506 | io_uring_show_cred(m, index, cred); | |
87ce955b | 9507 | } |
d7718a9d JA |
9508 | seq_printf(m, "PollList:\n"); |
9509 | spin_lock_irq(&ctx->completion_lock); | |
9510 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9511 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9512 | struct io_kiocb *req; | |
9513 | ||
9514 | hlist_for_each_entry(req, list, hash_node) | |
9515 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9516 | req->task->task_works != NULL); | |
9517 | } | |
9518 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9519 | if (has_lock) |
9520 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9521 | } |
9522 | ||
9523 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9524 | { | |
9525 | struct io_ring_ctx *ctx = f->private_data; | |
9526 | ||
9527 | if (percpu_ref_tryget(&ctx->refs)) { | |
9528 | __io_uring_show_fdinfo(ctx, m); | |
9529 | percpu_ref_put(&ctx->refs); | |
9530 | } | |
9531 | } | |
bebdb65e | 9532 | #endif |
87ce955b | 9533 | |
2b188cc1 JA |
9534 | static const struct file_operations io_uring_fops = { |
9535 | .release = io_uring_release, | |
9536 | .mmap = io_uring_mmap, | |
6c5c240e RP |
9537 | #ifndef CONFIG_MMU |
9538 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9539 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9540 | #endif | |
2b188cc1 JA |
9541 | .poll = io_uring_poll, |
9542 | .fasync = io_uring_fasync, | |
bebdb65e | 9543 | #ifdef CONFIG_PROC_FS |
87ce955b | 9544 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9545 | #endif |
2b188cc1 JA |
9546 | }; |
9547 | ||
9548 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9549 | struct io_uring_params *p) | |
9550 | { | |
75b28aff HV |
9551 | struct io_rings *rings; |
9552 | size_t size, sq_array_offset; | |
2b188cc1 | 9553 | |
bd740481 JA |
9554 | /* make sure these are sane, as we already accounted them */ |
9555 | ctx->sq_entries = p->sq_entries; | |
9556 | ctx->cq_entries = p->cq_entries; | |
9557 | ||
75b28aff HV |
9558 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9559 | if (size == SIZE_MAX) | |
9560 | return -EOVERFLOW; | |
9561 | ||
9562 | rings = io_mem_alloc(size); | |
9563 | if (!rings) | |
2b188cc1 JA |
9564 | return -ENOMEM; |
9565 | ||
75b28aff HV |
9566 | ctx->rings = rings; |
9567 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9568 | rings->sq_ring_mask = p->sq_entries - 1; | |
9569 | rings->cq_ring_mask = p->cq_entries - 1; | |
9570 | rings->sq_ring_entries = p->sq_entries; | |
9571 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
9572 | |
9573 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9574 | if (size == SIZE_MAX) { |
9575 | io_mem_free(ctx->rings); | |
9576 | ctx->rings = NULL; | |
2b188cc1 | 9577 | return -EOVERFLOW; |
eb065d30 | 9578 | } |
2b188cc1 JA |
9579 | |
9580 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9581 | if (!ctx->sq_sqes) { |
9582 | io_mem_free(ctx->rings); | |
9583 | ctx->rings = NULL; | |
2b188cc1 | 9584 | return -ENOMEM; |
eb065d30 | 9585 | } |
2b188cc1 | 9586 | |
2b188cc1 JA |
9587 | return 0; |
9588 | } | |
9589 | ||
9faadcc8 PB |
9590 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9591 | { | |
9592 | int ret, fd; | |
9593 | ||
9594 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9595 | if (fd < 0) | |
9596 | return fd; | |
9597 | ||
eef51daa | 9598 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
9599 | if (ret) { |
9600 | put_unused_fd(fd); | |
9601 | return ret; | |
9602 | } | |
9603 | fd_install(fd, file); | |
9604 | return fd; | |
9605 | } | |
9606 | ||
2b188cc1 JA |
9607 | /* |
9608 | * Allocate an anonymous fd, this is what constitutes the application | |
9609 | * visible backing of an io_uring instance. The application mmaps this | |
9610 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9611 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9612 | */ | |
9faadcc8 | 9613 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9614 | { |
9615 | struct file *file; | |
9faadcc8 | 9616 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9617 | int ret; |
9618 | ||
2b188cc1 JA |
9619 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9620 | &ctx->ring_sock); | |
9621 | if (ret) | |
9faadcc8 | 9622 | return ERR_PTR(ret); |
2b188cc1 JA |
9623 | #endif |
9624 | ||
2b188cc1 JA |
9625 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9626 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9627 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9628 | if (IS_ERR(file)) { |
9629 | sock_release(ctx->ring_sock); | |
9630 | ctx->ring_sock = NULL; | |
9631 | } else { | |
9632 | ctx->ring_sock->file = file; | |
0f212204 | 9633 | } |
2b188cc1 | 9634 | #endif |
9faadcc8 | 9635 | return file; |
2b188cc1 JA |
9636 | } |
9637 | ||
7f13657d XW |
9638 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9639 | struct io_uring_params __user *params) | |
2b188cc1 | 9640 | { |
2b188cc1 | 9641 | struct io_ring_ctx *ctx; |
9faadcc8 | 9642 | struct file *file; |
2b188cc1 JA |
9643 | int ret; |
9644 | ||
8110c1a6 | 9645 | if (!entries) |
2b188cc1 | 9646 | return -EINVAL; |
8110c1a6 JA |
9647 | if (entries > IORING_MAX_ENTRIES) { |
9648 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9649 | return -EINVAL; | |
9650 | entries = IORING_MAX_ENTRIES; | |
9651 | } | |
2b188cc1 JA |
9652 | |
9653 | /* | |
9654 | * Use twice as many entries for the CQ ring. It's possible for the | |
9655 | * application to drive a higher depth than the size of the SQ ring, | |
9656 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9657 | * some flexibility in overcommitting a bit. If the application has |
9658 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9659 | * of CQ ring entries manually. | |
2b188cc1 JA |
9660 | */ |
9661 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9662 | if (p->flags & IORING_SETUP_CQSIZE) { |
9663 | /* | |
9664 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9665 | * to a power-of-two, if it isn't already. We do NOT impose | |
9666 | * any cq vs sq ring sizing. | |
9667 | */ | |
eb2667b3 | 9668 | if (!p->cq_entries) |
33a107f0 | 9669 | return -EINVAL; |
8110c1a6 JA |
9670 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9671 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9672 | return -EINVAL; | |
9673 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9674 | } | |
eb2667b3 JQ |
9675 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9676 | if (p->cq_entries < p->sq_entries) | |
9677 | return -EINVAL; | |
33a107f0 JA |
9678 | } else { |
9679 | p->cq_entries = 2 * p->sq_entries; | |
9680 | } | |
2b188cc1 | 9681 | |
2b188cc1 | 9682 | ctx = io_ring_ctx_alloc(p); |
62e398be | 9683 | if (!ctx) |
2b188cc1 | 9684 | return -ENOMEM; |
2b188cc1 | 9685 | ctx->compat = in_compat_syscall(); |
62e398be JA |
9686 | if (!capable(CAP_IPC_LOCK)) |
9687 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
9688 | |
9689 | /* | |
9690 | * This is just grabbed for accounting purposes. When a process exits, | |
9691 | * the mm is exited and dropped before the files, hence we need to hang | |
9692 | * on to this mm purely for the purposes of being able to unaccount | |
9693 | * memory (locked/pinned vm). It's not used for anything else. | |
9694 | */ | |
6b7898eb | 9695 | mmgrab(current->mm); |
2aede0e4 | 9696 | ctx->mm_account = current->mm; |
6b7898eb | 9697 | |
2b188cc1 JA |
9698 | ret = io_allocate_scq_urings(ctx, p); |
9699 | if (ret) | |
9700 | goto err; | |
9701 | ||
7e84e1c7 | 9702 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9703 | if (ret) |
9704 | goto err; | |
eae071c9 | 9705 | /* always set a rsrc node */ |
47b228ce PB |
9706 | ret = io_rsrc_node_switch_start(ctx); |
9707 | if (ret) | |
9708 | goto err; | |
eae071c9 | 9709 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 9710 | |
2b188cc1 | 9711 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9712 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9713 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9714 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9715 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9716 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9717 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9718 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9719 | |
9720 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9721 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9722 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9723 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9724 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9725 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9726 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9727 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9728 | |
7f13657d XW |
9729 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9730 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9731 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 9732 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
9733 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
9734 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
9735 | |
9736 | if (copy_to_user(params, p, sizeof(*p))) { | |
9737 | ret = -EFAULT; | |
9738 | goto err; | |
9739 | } | |
d1719f70 | 9740 | |
9faadcc8 PB |
9741 | file = io_uring_get_file(ctx); |
9742 | if (IS_ERR(file)) { | |
9743 | ret = PTR_ERR(file); | |
9744 | goto err; | |
9745 | } | |
9746 | ||
044c1ab3 JA |
9747 | /* |
9748 | * Install ring fd as the very last thing, so we don't risk someone | |
9749 | * having closed it before we finish setup | |
9750 | */ | |
9faadcc8 PB |
9751 | ret = io_uring_install_fd(ctx, file); |
9752 | if (ret < 0) { | |
9753 | /* fput will clean it up */ | |
9754 | fput(file); | |
9755 | return ret; | |
9756 | } | |
044c1ab3 | 9757 | |
c826bd7a | 9758 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9759 | return ret; |
9760 | err: | |
9761 | io_ring_ctx_wait_and_kill(ctx); | |
9762 | return ret; | |
9763 | } | |
9764 | ||
9765 | /* | |
9766 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9767 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9768 | * params structure passed in. | |
9769 | */ | |
9770 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9771 | { | |
9772 | struct io_uring_params p; | |
2b188cc1 JA |
9773 | int i; |
9774 | ||
9775 | if (copy_from_user(&p, params, sizeof(p))) | |
9776 | return -EFAULT; | |
9777 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9778 | if (p.resv[i]) | |
9779 | return -EINVAL; | |
9780 | } | |
9781 | ||
6c271ce2 | 9782 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9783 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9784 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9785 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9786 | return -EINVAL; |
9787 | ||
7f13657d | 9788 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9789 | } |
9790 | ||
9791 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9792 | struct io_uring_params __user *, params) | |
9793 | { | |
9794 | return io_uring_setup(entries, params); | |
9795 | } | |
9796 | ||
66f4af93 JA |
9797 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9798 | { | |
9799 | struct io_uring_probe *p; | |
9800 | size_t size; | |
9801 | int i, ret; | |
9802 | ||
9803 | size = struct_size(p, ops, nr_args); | |
9804 | if (size == SIZE_MAX) | |
9805 | return -EOVERFLOW; | |
9806 | p = kzalloc(size, GFP_KERNEL); | |
9807 | if (!p) | |
9808 | return -ENOMEM; | |
9809 | ||
9810 | ret = -EFAULT; | |
9811 | if (copy_from_user(p, arg, size)) | |
9812 | goto out; | |
9813 | ret = -EINVAL; | |
9814 | if (memchr_inv(p, 0, size)) | |
9815 | goto out; | |
9816 | ||
9817 | p->last_op = IORING_OP_LAST - 1; | |
9818 | if (nr_args > IORING_OP_LAST) | |
9819 | nr_args = IORING_OP_LAST; | |
9820 | ||
9821 | for (i = 0; i < nr_args; i++) { | |
9822 | p->ops[i].op = i; | |
9823 | if (!io_op_defs[i].not_supported) | |
9824 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9825 | } | |
9826 | p->ops_len = i; | |
9827 | ||
9828 | ret = 0; | |
9829 | if (copy_to_user(arg, p, size)) | |
9830 | ret = -EFAULT; | |
9831 | out: | |
9832 | kfree(p); | |
9833 | return ret; | |
9834 | } | |
9835 | ||
071698e1 JA |
9836 | static int io_register_personality(struct io_ring_ctx *ctx) |
9837 | { | |
4379bf8b | 9838 | const struct cred *creds; |
61cf9370 | 9839 | u32 id; |
1e6fa521 | 9840 | int ret; |
071698e1 | 9841 | |
4379bf8b | 9842 | creds = get_current_cred(); |
1e6fa521 | 9843 | |
61cf9370 MWO |
9844 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
9845 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
9846 | if (ret < 0) { |
9847 | put_cred(creds); | |
9848 | return ret; | |
9849 | } | |
9850 | return id; | |
071698e1 JA |
9851 | } |
9852 | ||
21b55dbc SG |
9853 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9854 | unsigned int nr_args) | |
9855 | { | |
9856 | struct io_uring_restriction *res; | |
9857 | size_t size; | |
9858 | int i, ret; | |
9859 | ||
7e84e1c7 SG |
9860 | /* Restrictions allowed only if rings started disabled */ |
9861 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9862 | return -EBADFD; | |
9863 | ||
21b55dbc | 9864 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9865 | if (ctx->restrictions.registered) |
21b55dbc SG |
9866 | return -EBUSY; |
9867 | ||
9868 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9869 | return -EINVAL; | |
9870 | ||
9871 | size = array_size(nr_args, sizeof(*res)); | |
9872 | if (size == SIZE_MAX) | |
9873 | return -EOVERFLOW; | |
9874 | ||
9875 | res = memdup_user(arg, size); | |
9876 | if (IS_ERR(res)) | |
9877 | return PTR_ERR(res); | |
9878 | ||
9879 | ret = 0; | |
9880 | ||
9881 | for (i = 0; i < nr_args; i++) { | |
9882 | switch (res[i].opcode) { | |
9883 | case IORING_RESTRICTION_REGISTER_OP: | |
9884 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9885 | ret = -EINVAL; | |
9886 | goto out; | |
9887 | } | |
9888 | ||
9889 | __set_bit(res[i].register_op, | |
9890 | ctx->restrictions.register_op); | |
9891 | break; | |
9892 | case IORING_RESTRICTION_SQE_OP: | |
9893 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9894 | ret = -EINVAL; | |
9895 | goto out; | |
9896 | } | |
9897 | ||
9898 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9899 | break; | |
9900 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9901 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9902 | break; | |
9903 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9904 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9905 | break; | |
9906 | default: | |
9907 | ret = -EINVAL; | |
9908 | goto out; | |
9909 | } | |
9910 | } | |
9911 | ||
9912 | out: | |
9913 | /* Reset all restrictions if an error happened */ | |
9914 | if (ret != 0) | |
9915 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9916 | else | |
7e84e1c7 | 9917 | ctx->restrictions.registered = true; |
21b55dbc SG |
9918 | |
9919 | kfree(res); | |
9920 | return ret; | |
9921 | } | |
9922 | ||
7e84e1c7 SG |
9923 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9924 | { | |
9925 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9926 | return -EBADFD; | |
9927 | ||
9928 | if (ctx->restrictions.registered) | |
9929 | ctx->restricted = 1; | |
9930 | ||
0298ef96 PB |
9931 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
9932 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
9933 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
9934 | return 0; |
9935 | } | |
9936 | ||
fdecb662 | 9937 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 9938 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
9939 | unsigned nr_args) |
9940 | { | |
9941 | __u32 tmp; | |
9942 | int err; | |
9943 | ||
c3bdad02 PB |
9944 | if (up->resv) |
9945 | return -EINVAL; | |
98f0b3b4 PB |
9946 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
9947 | return -EOVERFLOW; | |
9948 | err = io_rsrc_node_switch_start(ctx); | |
9949 | if (err) | |
9950 | return err; | |
9951 | ||
fdecb662 PB |
9952 | switch (type) { |
9953 | case IORING_RSRC_FILE: | |
98f0b3b4 | 9954 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
9955 | case IORING_RSRC_BUFFER: |
9956 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
9957 | } |
9958 | return -EINVAL; | |
9959 | } | |
9960 | ||
c3bdad02 PB |
9961 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
9962 | unsigned nr_args) | |
98f0b3b4 | 9963 | { |
c3bdad02 | 9964 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
9965 | |
9966 | if (!nr_args) | |
9967 | return -EINVAL; | |
c3bdad02 PB |
9968 | memset(&up, 0, sizeof(up)); |
9969 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
9970 | return -EFAULT; | |
9971 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
9972 | } | |
9973 | ||
9974 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 9975 | unsigned size, unsigned type) |
c3bdad02 PB |
9976 | { |
9977 | struct io_uring_rsrc_update2 up; | |
9978 | ||
9979 | if (size != sizeof(up)) | |
9980 | return -EINVAL; | |
98f0b3b4 PB |
9981 | if (copy_from_user(&up, arg, sizeof(up))) |
9982 | return -EFAULT; | |
992da01a | 9983 | if (!up.nr || up.resv) |
98f0b3b4 | 9984 | return -EINVAL; |
992da01a | 9985 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
9986 | } |
9987 | ||
792e3582 | 9988 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 9989 | unsigned int size, unsigned int type) |
792e3582 PB |
9990 | { |
9991 | struct io_uring_rsrc_register rr; | |
9992 | ||
9993 | /* keep it extendible */ | |
9994 | if (size != sizeof(rr)) | |
9995 | return -EINVAL; | |
9996 | ||
9997 | memset(&rr, 0, sizeof(rr)); | |
9998 | if (copy_from_user(&rr, arg, size)) | |
9999 | return -EFAULT; | |
992da01a | 10000 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10001 | return -EINVAL; |
10002 | ||
992da01a | 10003 | switch (type) { |
792e3582 PB |
10004 | case IORING_RSRC_FILE: |
10005 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10006 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10007 | case IORING_RSRC_BUFFER: |
10008 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10009 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10010 | } |
10011 | return -EINVAL; | |
10012 | } | |
10013 | ||
fe76421d JA |
10014 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10015 | unsigned len) | |
10016 | { | |
10017 | struct io_uring_task *tctx = current->io_uring; | |
10018 | cpumask_var_t new_mask; | |
10019 | int ret; | |
10020 | ||
10021 | if (!tctx || !tctx->io_wq) | |
10022 | return -EINVAL; | |
10023 | ||
10024 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10025 | return -ENOMEM; | |
10026 | ||
10027 | cpumask_clear(new_mask); | |
10028 | if (len > cpumask_size()) | |
10029 | len = cpumask_size(); | |
10030 | ||
10031 | if (copy_from_user(new_mask, arg, len)) { | |
10032 | free_cpumask_var(new_mask); | |
10033 | return -EFAULT; | |
10034 | } | |
10035 | ||
10036 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10037 | free_cpumask_var(new_mask); | |
10038 | return ret; | |
10039 | } | |
10040 | ||
10041 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10042 | { | |
10043 | struct io_uring_task *tctx = current->io_uring; | |
10044 | ||
10045 | if (!tctx || !tctx->io_wq) | |
10046 | return -EINVAL; | |
10047 | ||
10048 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10049 | } | |
10050 | ||
071698e1 JA |
10051 | static bool io_register_op_must_quiesce(int op) |
10052 | { | |
10053 | switch (op) { | |
bd54b6fe BM |
10054 | case IORING_REGISTER_BUFFERS: |
10055 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10056 | case IORING_REGISTER_FILES: |
071698e1 JA |
10057 | case IORING_UNREGISTER_FILES: |
10058 | case IORING_REGISTER_FILES_UPDATE: | |
10059 | case IORING_REGISTER_PROBE: | |
10060 | case IORING_REGISTER_PERSONALITY: | |
10061 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10062 | case IORING_REGISTER_FILES2: |
10063 | case IORING_REGISTER_FILES_UPDATE2: | |
10064 | case IORING_REGISTER_BUFFERS2: | |
10065 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10066 | case IORING_REGISTER_IOWQ_AFF: |
10067 | case IORING_UNREGISTER_IOWQ_AFF: | |
071698e1 JA |
10068 | return false; |
10069 | default: | |
10070 | return true; | |
10071 | } | |
10072 | } | |
10073 | ||
edafccee JA |
10074 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10075 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10076 | __releases(ctx->uring_lock) |
10077 | __acquires(ctx->uring_lock) | |
edafccee JA |
10078 | { |
10079 | int ret; | |
10080 | ||
35fa71a0 JA |
10081 | /* |
10082 | * We're inside the ring mutex, if the ref is already dying, then | |
10083 | * someone else killed the ctx or is already going through | |
10084 | * io_uring_register(). | |
10085 | */ | |
10086 | if (percpu_ref_is_dying(&ctx->refs)) | |
10087 | return -ENXIO; | |
10088 | ||
75c4021a PB |
10089 | if (ctx->restricted) { |
10090 | if (opcode >= IORING_REGISTER_LAST) | |
10091 | return -EINVAL; | |
10092 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10093 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10094 | return -EACCES; | |
10095 | } | |
10096 | ||
071698e1 | 10097 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10098 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 10099 | |
05f3fb3c JA |
10100 | /* |
10101 | * Drop uring mutex before waiting for references to exit. If | |
10102 | * another thread is currently inside io_uring_enter() it might | |
10103 | * need to grab the uring_lock to make progress. If we hold it | |
10104 | * here across the drain wait, then we can deadlock. It's safe | |
10105 | * to drop the mutex here, since no new references will come in | |
10106 | * after we've killed the percpu ref. | |
10107 | */ | |
10108 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
10109 | do { |
10110 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10111 | if (!ret) | |
10112 | break; | |
ed6930c9 JA |
10113 | ret = io_run_task_work_sig(); |
10114 | if (ret < 0) | |
10115 | break; | |
af9c1a44 | 10116 | } while (1); |
05f3fb3c | 10117 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 10118 | |
c150368b | 10119 | if (ret) { |
f70865db PB |
10120 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); |
10121 | return ret; | |
c150368b | 10122 | } |
05f3fb3c | 10123 | } |
edafccee JA |
10124 | |
10125 | switch (opcode) { | |
10126 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10127 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10128 | break; |
10129 | case IORING_UNREGISTER_BUFFERS: | |
10130 | ret = -EINVAL; | |
10131 | if (arg || nr_args) | |
10132 | break; | |
0a96bbe4 | 10133 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10134 | break; |
6b06314c | 10135 | case IORING_REGISTER_FILES: |
792e3582 | 10136 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10137 | break; |
10138 | case IORING_UNREGISTER_FILES: | |
10139 | ret = -EINVAL; | |
10140 | if (arg || nr_args) | |
10141 | break; | |
10142 | ret = io_sqe_files_unregister(ctx); | |
10143 | break; | |
c3a31e60 | 10144 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10145 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10146 | break; |
9b402849 | 10147 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10148 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10149 | ret = -EINVAL; |
10150 | if (nr_args != 1) | |
10151 | break; | |
10152 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10153 | if (ret) |
10154 | break; | |
10155 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10156 | ctx->eventfd_async = 1; | |
10157 | else | |
10158 | ctx->eventfd_async = 0; | |
9b402849 JA |
10159 | break; |
10160 | case IORING_UNREGISTER_EVENTFD: | |
10161 | ret = -EINVAL; | |
10162 | if (arg || nr_args) | |
10163 | break; | |
10164 | ret = io_eventfd_unregister(ctx); | |
10165 | break; | |
66f4af93 JA |
10166 | case IORING_REGISTER_PROBE: |
10167 | ret = -EINVAL; | |
10168 | if (!arg || nr_args > 256) | |
10169 | break; | |
10170 | ret = io_probe(ctx, arg, nr_args); | |
10171 | break; | |
071698e1 JA |
10172 | case IORING_REGISTER_PERSONALITY: |
10173 | ret = -EINVAL; | |
10174 | if (arg || nr_args) | |
10175 | break; | |
10176 | ret = io_register_personality(ctx); | |
10177 | break; | |
10178 | case IORING_UNREGISTER_PERSONALITY: | |
10179 | ret = -EINVAL; | |
10180 | if (arg) | |
10181 | break; | |
10182 | ret = io_unregister_personality(ctx, nr_args); | |
10183 | break; | |
7e84e1c7 SG |
10184 | case IORING_REGISTER_ENABLE_RINGS: |
10185 | ret = -EINVAL; | |
10186 | if (arg || nr_args) | |
10187 | break; | |
10188 | ret = io_register_enable_rings(ctx); | |
10189 | break; | |
21b55dbc SG |
10190 | case IORING_REGISTER_RESTRICTIONS: |
10191 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10192 | break; | |
992da01a PB |
10193 | case IORING_REGISTER_FILES2: |
10194 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10195 | break; | |
10196 | case IORING_REGISTER_FILES_UPDATE2: | |
10197 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10198 | IORING_RSRC_FILE); | |
10199 | break; | |
10200 | case IORING_REGISTER_BUFFERS2: | |
10201 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10202 | break; |
992da01a PB |
10203 | case IORING_REGISTER_BUFFERS_UPDATE: |
10204 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10205 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10206 | break; |
fe76421d JA |
10207 | case IORING_REGISTER_IOWQ_AFF: |
10208 | ret = -EINVAL; | |
10209 | if (!arg || !nr_args) | |
10210 | break; | |
10211 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10212 | break; | |
10213 | case IORING_UNREGISTER_IOWQ_AFF: | |
10214 | ret = -EINVAL; | |
10215 | if (arg || nr_args) | |
10216 | break; | |
10217 | ret = io_unregister_iowq_aff(ctx); | |
10218 | break; | |
edafccee JA |
10219 | default: |
10220 | ret = -EINVAL; | |
10221 | break; | |
10222 | } | |
10223 | ||
071698e1 | 10224 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10225 | /* bring the ctx back to life */ |
05f3fb3c | 10226 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10227 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10228 | } |
edafccee JA |
10229 | return ret; |
10230 | } | |
10231 | ||
10232 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10233 | void __user *, arg, unsigned int, nr_args) | |
10234 | { | |
10235 | struct io_ring_ctx *ctx; | |
10236 | long ret = -EBADF; | |
10237 | struct fd f; | |
10238 | ||
10239 | f = fdget(fd); | |
10240 | if (!f.file) | |
10241 | return -EBADF; | |
10242 | ||
10243 | ret = -EOPNOTSUPP; | |
10244 | if (f.file->f_op != &io_uring_fops) | |
10245 | goto out_fput; | |
10246 | ||
10247 | ctx = f.file->private_data; | |
10248 | ||
b6c23dd5 PB |
10249 | io_run_task_work(); |
10250 | ||
edafccee JA |
10251 | mutex_lock(&ctx->uring_lock); |
10252 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10253 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10254 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10255 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10256 | out_fput: |
10257 | fdput(f); | |
10258 | return ret; | |
10259 | } | |
10260 | ||
2b188cc1 JA |
10261 | static int __init io_uring_init(void) |
10262 | { | |
d7f62e82 SM |
10263 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10264 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10265 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10266 | } while (0) | |
10267 | ||
10268 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10269 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10270 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10271 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10272 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10273 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10274 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10275 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10276 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10277 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10278 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10279 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10280 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10281 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10282 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10283 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10284 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10285 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10286 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10287 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10288 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10289 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10290 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10291 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10292 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10293 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10294 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10295 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10296 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10297 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10298 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10299 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10300 | |
b0d658ec PB |
10301 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10302 | sizeof(struct io_uring_rsrc_update)); | |
10303 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10304 | sizeof(struct io_uring_rsrc_update2)); | |
10305 | /* should fit into one byte */ | |
10306 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10307 | ||
d3656344 | 10308 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10309 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
16340eab | 10310 | |
91f245d5 JA |
10311 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10312 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10313 | return 0; |
10314 | }; | |
10315 | __initcall(io_uring_init); |