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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 | 94 | |
187f08c1 | 95 | /* only define max */ |
042b0d85 | 96 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
97 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
98 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 99 | |
187f08c1 | 100 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
101 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
102 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
103 | ||
489809e2 PB |
104 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
105 | ||
b16fed66 PB |
106 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
107 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
108 | IOSQE_BUFFER_SELECT) | |
c854357b PB |
109 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
110 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) | |
b16fed66 | 111 | |
09899b19 PB |
112 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
113 | ||
2b188cc1 JA |
114 | struct io_uring { |
115 | u32 head ____cacheline_aligned_in_smp; | |
116 | u32 tail ____cacheline_aligned_in_smp; | |
117 | }; | |
118 | ||
1e84b97b | 119 | /* |
75b28aff HV |
120 | * This data is shared with the application through the mmap at offsets |
121 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
122 | * |
123 | * The offsets to the member fields are published through struct | |
124 | * io_sqring_offsets when calling io_uring_setup. | |
125 | */ | |
75b28aff | 126 | struct io_rings { |
1e84b97b SB |
127 | /* |
128 | * Head and tail offsets into the ring; the offsets need to be | |
129 | * masked to get valid indices. | |
130 | * | |
75b28aff HV |
131 | * The kernel controls head of the sq ring and the tail of the cq ring, |
132 | * and the application controls tail of the sq ring and the head of the | |
133 | * cq ring. | |
1e84b97b | 134 | */ |
75b28aff | 135 | struct io_uring sq, cq; |
1e84b97b | 136 | /* |
75b28aff | 137 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
138 | * ring_entries - 1) |
139 | */ | |
75b28aff HV |
140 | u32 sq_ring_mask, cq_ring_mask; |
141 | /* Ring sizes (constant, power of 2) */ | |
142 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
143 | /* |
144 | * Number of invalid entries dropped by the kernel due to | |
145 | * invalid index stored in array | |
146 | * | |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application (i.e. get number of "new events" by comparing to | |
149 | * cached value). | |
150 | * | |
151 | * After a new SQ head value was read by the application this | |
152 | * counter includes all submissions that were dropped reaching | |
153 | * the new SQ head (and possibly more). | |
154 | */ | |
75b28aff | 155 | u32 sq_dropped; |
1e84b97b | 156 | /* |
0d9b5b3a | 157 | * Runtime SQ flags |
1e84b97b SB |
158 | * |
159 | * Written by the kernel, shouldn't be modified by the | |
160 | * application. | |
161 | * | |
162 | * The application needs a full memory barrier before checking | |
163 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
164 | */ | |
75b28aff | 165 | u32 sq_flags; |
0d9b5b3a SG |
166 | /* |
167 | * Runtime CQ flags | |
168 | * | |
169 | * Written by the application, shouldn't be modified by the | |
170 | * kernel. | |
171 | */ | |
fe7e3257 | 172 | u32 cq_flags; |
1e84b97b SB |
173 | /* |
174 | * Number of completion events lost because the queue was full; | |
175 | * this should be avoided by the application by making sure | |
0b4295b5 | 176 | * there are not more requests pending than there is space in |
1e84b97b SB |
177 | * the completion queue. |
178 | * | |
179 | * Written by the kernel, shouldn't be modified by the | |
180 | * application (i.e. get number of "new events" by comparing to | |
181 | * cached value). | |
182 | * | |
183 | * As completion events come in out of order this counter is not | |
184 | * ordered with any other data. | |
185 | */ | |
75b28aff | 186 | u32 cq_overflow; |
1e84b97b SB |
187 | /* |
188 | * Ring buffer of completion events. | |
189 | * | |
190 | * The kernel writes completion events fresh every time they are | |
191 | * produced, so the application is allowed to modify pending | |
192 | * entries. | |
193 | */ | |
75b28aff | 194 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
195 | }; |
196 | ||
45d189c6 PB |
197 | enum io_uring_cmd_flags { |
198 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 199 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
200 | }; |
201 | ||
edafccee JA |
202 | struct io_mapped_ubuf { |
203 | u64 ubuf; | |
4751f53d | 204 | u64 ubuf_end; |
edafccee | 205 | unsigned int nr_bvecs; |
de293938 | 206 | unsigned long acct_pages; |
41edf1a5 | 207 | struct bio_vec bvec[]; |
edafccee JA |
208 | }; |
209 | ||
50238531 BM |
210 | struct io_ring_ctx; |
211 | ||
6c2450ae PB |
212 | struct io_overflow_cqe { |
213 | struct io_uring_cqe cqe; | |
214 | struct list_head list; | |
215 | }; | |
216 | ||
a04b0ac0 PB |
217 | struct io_fixed_file { |
218 | /* file * with additional FFS_* flags */ | |
219 | unsigned long file_ptr; | |
220 | }; | |
221 | ||
269bbe5f BM |
222 | struct io_rsrc_put { |
223 | struct list_head list; | |
b60c8dce | 224 | u64 tag; |
50238531 BM |
225 | union { |
226 | void *rsrc; | |
227 | struct file *file; | |
bd54b6fe | 228 | struct io_mapped_ubuf *buf; |
50238531 | 229 | }; |
269bbe5f BM |
230 | }; |
231 | ||
aeca241b | 232 | struct io_file_table { |
042b0d85 | 233 | struct io_fixed_file *files; |
31b51510 JA |
234 | }; |
235 | ||
b895c9a6 | 236 | struct io_rsrc_node { |
05589553 XW |
237 | struct percpu_ref refs; |
238 | struct list_head node; | |
269bbe5f | 239 | struct list_head rsrc_list; |
b895c9a6 | 240 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 241 | struct llist_node llist; |
e297822b | 242 | bool done; |
05589553 XW |
243 | }; |
244 | ||
40ae0ff7 PB |
245 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
246 | ||
b895c9a6 | 247 | struct io_rsrc_data { |
05f3fb3c JA |
248 | struct io_ring_ctx *ctx; |
249 | ||
2d091d62 PB |
250 | u64 **tags; |
251 | unsigned int nr; | |
40ae0ff7 | 252 | rsrc_put_fn *do_put; |
3e942498 | 253 | atomic_t refs; |
05f3fb3c | 254 | struct completion done; |
8bad28d8 | 255 | bool quiesce; |
05f3fb3c JA |
256 | }; |
257 | ||
5a2e745d JA |
258 | struct io_buffer { |
259 | struct list_head list; | |
260 | __u64 addr; | |
d1f82808 | 261 | __u32 len; |
5a2e745d JA |
262 | __u16 bid; |
263 | }; | |
264 | ||
21b55dbc SG |
265 | struct io_restriction { |
266 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
267 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
268 | u8 sqe_flags_allowed; | |
269 | u8 sqe_flags_required; | |
7e84e1c7 | 270 | bool registered; |
21b55dbc SG |
271 | }; |
272 | ||
37d1e2e3 JA |
273 | enum { |
274 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
275 | IO_SQ_THREAD_SHOULD_PARK, | |
276 | }; | |
277 | ||
534ca6d6 JA |
278 | struct io_sq_data { |
279 | refcount_t refs; | |
9e138a48 | 280 | atomic_t park_pending; |
09a6f4ef | 281 | struct mutex lock; |
69fb2131 JA |
282 | |
283 | /* ctx's that are using this sqd */ | |
284 | struct list_head ctx_list; | |
69fb2131 | 285 | |
534ca6d6 JA |
286 | struct task_struct *thread; |
287 | struct wait_queue_head wait; | |
08369246 XW |
288 | |
289 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
290 | int sq_cpu; |
291 | pid_t task_pid; | |
5c2469e0 | 292 | pid_t task_tgid; |
37d1e2e3 JA |
293 | |
294 | unsigned long state; | |
37d1e2e3 | 295 | struct completion exited; |
534ca6d6 JA |
296 | }; |
297 | ||
6dd0be1e | 298 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 299 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 300 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 301 | |
a1ab7b35 PB |
302 | struct io_submit_link { |
303 | struct io_kiocb *head; | |
304 | struct io_kiocb *last; | |
305 | }; | |
306 | ||
258b29a9 PB |
307 | struct io_submit_state { |
308 | struct blk_plug plug; | |
a1ab7b35 | 309 | struct io_submit_link link; |
258b29a9 PB |
310 | |
311 | /* | |
312 | * io_kiocb alloc cache | |
313 | */ | |
bf019da7 | 314 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
315 | unsigned int free_reqs; |
316 | ||
317 | bool plug_started; | |
318 | ||
319 | /* | |
320 | * Batch completion logic | |
321 | */ | |
cd0ca2e0 PB |
322 | struct io_kiocb *compl_reqs[IO_COMPL_BATCH]; |
323 | unsigned int compl_nr; | |
324 | /* inline/task_work completion list, under ->uring_lock */ | |
325 | struct list_head free_list; | |
258b29a9 | 326 | |
258b29a9 PB |
327 | unsigned int ios_left; |
328 | }; | |
329 | ||
2b188cc1 | 330 | struct io_ring_ctx { |
b52ecf8c | 331 | /* const or read-mostly hot data */ |
2b188cc1 JA |
332 | struct { |
333 | struct percpu_ref refs; | |
2b188cc1 | 334 | |
b52ecf8c | 335 | struct io_rings *rings; |
2b188cc1 | 336 | unsigned int flags; |
e1d85334 | 337 | unsigned int compat: 1; |
e1d85334 RD |
338 | unsigned int drain_next: 1; |
339 | unsigned int eventfd_async: 1; | |
21b55dbc | 340 | unsigned int restricted: 1; |
f18ee4cf | 341 | unsigned int off_timeout_used: 1; |
10c66904 | 342 | unsigned int drain_active: 1; |
b52ecf8c | 343 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 344 | |
7f1129d2 | 345 | /* submission data */ |
b52ecf8c | 346 | struct { |
0499e582 PB |
347 | struct mutex uring_lock; |
348 | ||
75b28aff HV |
349 | /* |
350 | * Ring buffer of indices into array of io_uring_sqe, which is | |
351 | * mmapped by the application using the IORING_OFF_SQES offset. | |
352 | * | |
353 | * This indirection could e.g. be used to assign fixed | |
354 | * io_uring_sqe entries to operations and only submit them to | |
355 | * the queue when needed. | |
356 | * | |
357 | * The kernel modifies neither the indices array nor the entries | |
358 | * array. | |
359 | */ | |
360 | u32 *sq_array; | |
c7af47cf | 361 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
362 | unsigned cached_sq_head; |
363 | unsigned sq_entries; | |
de0617e4 | 364 | struct list_head defer_list; |
7f1129d2 PB |
365 | |
366 | /* | |
367 | * Fixed resources fast path, should be accessed only under | |
368 | * uring_lock, and updated through io_uring_register(2) | |
369 | */ | |
370 | struct io_rsrc_node *rsrc_node; | |
371 | struct io_file_table file_table; | |
372 | unsigned nr_user_files; | |
373 | unsigned nr_user_bufs; | |
374 | struct io_mapped_ubuf **user_bufs; | |
375 | ||
376 | struct io_submit_state submit_state; | |
5262f567 | 377 | struct list_head timeout_list; |
ef9dd637 | 378 | struct list_head ltimeout_list; |
1d7bb1d5 | 379 | struct list_head cq_overflow_list; |
7f1129d2 PB |
380 | struct xarray io_buffers; |
381 | struct xarray personalities; | |
382 | u32 pers_next; | |
383 | unsigned sq_thread_idle; | |
2b188cc1 JA |
384 | } ____cacheline_aligned_in_smp; |
385 | ||
d0acdee2 PB |
386 | /* IRQ completion list, under ->completion_lock */ |
387 | struct list_head locked_free_list; | |
388 | unsigned int locked_free_nr; | |
3c1a2ead | 389 | |
7c30f36a | 390 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
391 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
392 | ||
90554200 | 393 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 394 | struct list_head sqd_list; |
75b28aff | 395 | |
5ed7a37d PB |
396 | unsigned long check_cq_overflow; |
397 | ||
206aefde JA |
398 | struct { |
399 | unsigned cached_cq_tail; | |
400 | unsigned cq_entries; | |
0499e582 | 401 | struct eventfd_ctx *cq_ev_fd; |
311997b3 | 402 | struct wait_queue_head poll_wait; |
0499e582 PB |
403 | struct wait_queue_head cq_wait; |
404 | unsigned cq_extra; | |
405 | atomic_t cq_timeouts; | |
206aefde | 406 | struct fasync_struct *cq_fasync; |
0499e582 | 407 | unsigned cq_last_tm_flush; |
206aefde | 408 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 409 | |
2b188cc1 JA |
410 | struct { |
411 | spinlock_t completion_lock; | |
e94f141b | 412 | |
89850fce JA |
413 | spinlock_t timeout_lock; |
414 | ||
def596e9 | 415 | /* |
540e32a0 | 416 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
417 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
418 | * For SQPOLL, only the single threaded io_sq_thread() will | |
419 | * manipulate the list, hence no extra locking is needed there. | |
420 | */ | |
540e32a0 | 421 | struct list_head iopoll_list; |
78076bb6 JA |
422 | struct hlist_head *cancel_hash; |
423 | unsigned cancel_hash_bits; | |
915b3dde | 424 | bool poll_multi_queue; |
2b188cc1 | 425 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 426 | |
21b55dbc | 427 | struct io_restriction restrictions; |
3c1a2ead | 428 | |
b13a8918 PB |
429 | /* slow path rsrc auxilary data, used by update/register */ |
430 | struct { | |
431 | struct io_rsrc_node *rsrc_backup_node; | |
432 | struct io_mapped_ubuf *dummy_ubuf; | |
433 | struct io_rsrc_data *file_data; | |
434 | struct io_rsrc_data *buf_data; | |
435 | ||
436 | struct delayed_work rsrc_put_work; | |
437 | struct llist_head rsrc_put_llist; | |
438 | struct list_head rsrc_ref_list; | |
439 | spinlock_t rsrc_ref_lock; | |
440 | }; | |
441 | ||
3c1a2ead | 442 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
443 | struct { |
444 | #if defined(CONFIG_UNIX) | |
445 | struct socket *ring_sock; | |
446 | #endif | |
447 | /* hashed buffered write serialization */ | |
448 | struct io_wq_hash *hash_map; | |
449 | ||
450 | /* Only used for accounting purposes */ | |
451 | struct user_struct *user; | |
452 | struct mm_struct *mm_account; | |
453 | ||
454 | /* ctx exit and cancelation */ | |
9011bf9a PB |
455 | struct llist_head fallback_llist; |
456 | struct delayed_work fallback_work; | |
b986af7e PB |
457 | struct work_struct exit_work; |
458 | struct list_head tctx_list; | |
459 | struct completion ref_comp; | |
460 | }; | |
2b188cc1 JA |
461 | }; |
462 | ||
53e043b2 SM |
463 | struct io_uring_task { |
464 | /* submission side */ | |
09899b19 | 465 | int cached_refs; |
53e043b2 SM |
466 | struct xarray xa; |
467 | struct wait_queue_head wait; | |
ee53fb2b SM |
468 | const struct io_ring_ctx *last; |
469 | struct io_wq *io_wq; | |
53e043b2 | 470 | struct percpu_counter inflight; |
b303fe2e | 471 | atomic_t inflight_tracked; |
53e043b2 | 472 | atomic_t in_idle; |
53e043b2 SM |
473 | |
474 | spinlock_t task_lock; | |
475 | struct io_wq_work_list task_list; | |
53e043b2 | 476 | struct callback_head task_work; |
6294f368 | 477 | bool task_running; |
53e043b2 SM |
478 | }; |
479 | ||
09bb8394 JA |
480 | /* |
481 | * First field must be the file pointer in all the | |
482 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
483 | */ | |
221c5eb2 JA |
484 | struct io_poll_iocb { |
485 | struct file *file; | |
018043be | 486 | struct wait_queue_head *head; |
221c5eb2 | 487 | __poll_t events; |
8c838788 | 488 | bool done; |
221c5eb2 | 489 | bool canceled; |
392edb45 | 490 | struct wait_queue_entry wait; |
221c5eb2 JA |
491 | }; |
492 | ||
9d805892 | 493 | struct io_poll_update { |
018043be | 494 | struct file *file; |
9d805892 PB |
495 | u64 old_user_data; |
496 | u64 new_user_data; | |
497 | __poll_t events; | |
b69de288 JA |
498 | bool update_events; |
499 | bool update_user_data; | |
018043be PB |
500 | }; |
501 | ||
b5dba59e JA |
502 | struct io_close { |
503 | struct file *file; | |
b5dba59e JA |
504 | int fd; |
505 | }; | |
506 | ||
ad8a48ac JA |
507 | struct io_timeout_data { |
508 | struct io_kiocb *req; | |
509 | struct hrtimer timer; | |
510 | struct timespec64 ts; | |
511 | enum hrtimer_mode mode; | |
50c1df2b | 512 | u32 flags; |
ad8a48ac JA |
513 | }; |
514 | ||
8ed8d3c3 JA |
515 | struct io_accept { |
516 | struct file *file; | |
517 | struct sockaddr __user *addr; | |
518 | int __user *addr_len; | |
519 | int flags; | |
aaa4db12 | 520 | u32 file_slot; |
09952e3e | 521 | unsigned long nofile; |
8ed8d3c3 JA |
522 | }; |
523 | ||
524 | struct io_sync { | |
525 | struct file *file; | |
526 | loff_t len; | |
527 | loff_t off; | |
528 | int flags; | |
d63d1b5e | 529 | int mode; |
8ed8d3c3 JA |
530 | }; |
531 | ||
fbf23849 JA |
532 | struct io_cancel { |
533 | struct file *file; | |
534 | u64 addr; | |
535 | }; | |
536 | ||
b29472ee JA |
537 | struct io_timeout { |
538 | struct file *file; | |
bfe68a22 PB |
539 | u32 off; |
540 | u32 target_seq; | |
135fcde8 | 541 | struct list_head list; |
90cd7e42 PB |
542 | /* head of the link, used by linked timeouts only */ |
543 | struct io_kiocb *head; | |
89b263f6 JA |
544 | /* for linked completions */ |
545 | struct io_kiocb *prev; | |
b29472ee JA |
546 | }; |
547 | ||
0bdf7a2d PB |
548 | struct io_timeout_rem { |
549 | struct file *file; | |
550 | u64 addr; | |
9c8e11b3 PB |
551 | |
552 | /* timeout update */ | |
553 | struct timespec64 ts; | |
554 | u32 flags; | |
f1042b6c | 555 | bool ltimeout; |
0bdf7a2d PB |
556 | }; |
557 | ||
9adbd45d JA |
558 | struct io_rw { |
559 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
560 | struct kiocb kiocb; | |
561 | u64 addr; | |
562 | u64 len; | |
563 | }; | |
564 | ||
3fbb51c1 JA |
565 | struct io_connect { |
566 | struct file *file; | |
567 | struct sockaddr __user *addr; | |
568 | int addr_len; | |
569 | }; | |
570 | ||
e47293fd JA |
571 | struct io_sr_msg { |
572 | struct file *file; | |
fddaface | 573 | union { |
4af3417a PB |
574 | struct compat_msghdr __user *umsg_compat; |
575 | struct user_msghdr __user *umsg; | |
576 | void __user *buf; | |
fddaface | 577 | }; |
e47293fd | 578 | int msg_flags; |
bcda7baa | 579 | int bgid; |
fddaface | 580 | size_t len; |
bcda7baa | 581 | struct io_buffer *kbuf; |
e47293fd JA |
582 | }; |
583 | ||
15b71abe JA |
584 | struct io_open { |
585 | struct file *file; | |
586 | int dfd; | |
b9445598 | 587 | u32 file_slot; |
15b71abe | 588 | struct filename *filename; |
c12cedf2 | 589 | struct open_how how; |
4022e7af | 590 | unsigned long nofile; |
15b71abe JA |
591 | }; |
592 | ||
269bbe5f | 593 | struct io_rsrc_update { |
05f3fb3c JA |
594 | struct file *file; |
595 | u64 arg; | |
596 | u32 nr_args; | |
597 | u32 offset; | |
598 | }; | |
599 | ||
4840e418 JA |
600 | struct io_fadvise { |
601 | struct file *file; | |
602 | u64 offset; | |
603 | u32 len; | |
604 | u32 advice; | |
605 | }; | |
606 | ||
c1ca757b JA |
607 | struct io_madvise { |
608 | struct file *file; | |
609 | u64 addr; | |
610 | u32 len; | |
611 | u32 advice; | |
612 | }; | |
613 | ||
3e4827b0 JA |
614 | struct io_epoll { |
615 | struct file *file; | |
616 | int epfd; | |
617 | int op; | |
618 | int fd; | |
619 | struct epoll_event event; | |
e47293fd JA |
620 | }; |
621 | ||
7d67af2c PB |
622 | struct io_splice { |
623 | struct file *file_out; | |
624 | struct file *file_in; | |
625 | loff_t off_out; | |
626 | loff_t off_in; | |
627 | u64 len; | |
628 | unsigned int flags; | |
629 | }; | |
630 | ||
ddf0322d JA |
631 | struct io_provide_buf { |
632 | struct file *file; | |
633 | __u64 addr; | |
38134ada | 634 | __u32 len; |
ddf0322d JA |
635 | __u32 bgid; |
636 | __u16 nbufs; | |
637 | __u16 bid; | |
638 | }; | |
639 | ||
1d9e1288 BM |
640 | struct io_statx { |
641 | struct file *file; | |
642 | int dfd; | |
643 | unsigned int mask; | |
644 | unsigned int flags; | |
e62753e4 | 645 | const char __user *filename; |
1d9e1288 BM |
646 | struct statx __user *buffer; |
647 | }; | |
648 | ||
36f4fa68 JA |
649 | struct io_shutdown { |
650 | struct file *file; | |
651 | int how; | |
652 | }; | |
653 | ||
80a261fd JA |
654 | struct io_rename { |
655 | struct file *file; | |
656 | int old_dfd; | |
657 | int new_dfd; | |
658 | struct filename *oldpath; | |
659 | struct filename *newpath; | |
660 | int flags; | |
661 | }; | |
662 | ||
14a1143b JA |
663 | struct io_unlink { |
664 | struct file *file; | |
665 | int dfd; | |
666 | int flags; | |
667 | struct filename *filename; | |
668 | }; | |
669 | ||
e34a02dc DK |
670 | struct io_mkdir { |
671 | struct file *file; | |
672 | int dfd; | |
673 | umode_t mode; | |
674 | struct filename *filename; | |
675 | }; | |
676 | ||
7a8721f8 DK |
677 | struct io_symlink { |
678 | struct file *file; | |
679 | int new_dfd; | |
680 | struct filename *oldpath; | |
681 | struct filename *newpath; | |
682 | }; | |
683 | ||
cf30da90 DK |
684 | struct io_hardlink { |
685 | struct file *file; | |
686 | int old_dfd; | |
687 | int new_dfd; | |
688 | struct filename *oldpath; | |
689 | struct filename *newpath; | |
690 | int flags; | |
691 | }; | |
692 | ||
3ca405eb PB |
693 | struct io_completion { |
694 | struct file *file; | |
8c3f9cd1 | 695 | u32 cflags; |
3ca405eb PB |
696 | }; |
697 | ||
f499a021 JA |
698 | struct io_async_connect { |
699 | struct sockaddr_storage address; | |
700 | }; | |
701 | ||
03b1230c JA |
702 | struct io_async_msghdr { |
703 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
704 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
705 | struct iovec *free_iov; | |
03b1230c JA |
706 | struct sockaddr __user *uaddr; |
707 | struct msghdr msg; | |
b537916c | 708 | struct sockaddr_storage addr; |
03b1230c JA |
709 | }; |
710 | ||
f67676d1 JA |
711 | struct io_async_rw { |
712 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
713 | const struct iovec *free_iovec; |
714 | struct iov_iter iter; | |
227c0c96 | 715 | size_t bytes_done; |
bcf5a063 | 716 | struct wait_page_queue wpq; |
f67676d1 JA |
717 | }; |
718 | ||
6b47ee6e PB |
719 | enum { |
720 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
721 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
722 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
723 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
724 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 725 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 726 | |
dddca226 | 727 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 728 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
729 | REQ_F_INFLIGHT_BIT, |
730 | REQ_F_CUR_POS_BIT, | |
731 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 732 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 733 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 734 | REQ_F_POLLED_BIT, |
bcda7baa | 735 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 736 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 737 | REQ_F_REISSUE_BIT, |
8c130827 | 738 | REQ_F_DONT_REISSUE_BIT, |
b8e64b53 | 739 | REQ_F_CREDS_BIT, |
20e60a38 | 740 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 741 | REQ_F_ARM_LTIMEOUT_BIT, |
7b29f92d | 742 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
743 | REQ_F_NOWAIT_READ_BIT, |
744 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 745 | REQ_F_ISREG_BIT, |
84557871 JA |
746 | |
747 | /* not a real bit, just to check we're not overflowing the space */ | |
748 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
749 | }; |
750 | ||
751 | enum { | |
752 | /* ctx owns file */ | |
753 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
754 | /* drain existing IO first */ | |
755 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
756 | /* linked sqes */ | |
757 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
758 | /* doesn't sever on completion < 0 */ | |
759 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
760 | /* IOSQE_ASYNC */ | |
761 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
762 | /* IOSQE_BUFFER_SELECT */ |
763 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 764 | |
6b47ee6e | 765 | /* fail rest of links */ |
93d2bcd2 | 766 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 767 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
768 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
769 | /* read/write uses file position */ | |
770 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
771 | /* must not punt to workers */ | |
772 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 773 | /* has or had linked timeout */ |
6b47ee6e | 774 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
775 | /* needs cleanup */ |
776 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
777 | /* already went through poll handler */ |
778 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
779 | /* buffer already selected */ |
780 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
781 | /* completion is deferred through io_comp_state */ |
782 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
783 | /* caller should reissue async */ |
784 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
785 | /* don't attempt request reissue, see io_rw_reissue() */ |
786 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d | 787 | /* supports async reads */ |
b191e2df | 788 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 789 | /* supports async writes */ |
b191e2df | 790 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
791 | /* regular file */ |
792 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
793 | /* has creds assigned */ |
794 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
795 | /* skip refcounting if not set */ |
796 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
797 | /* there is a linked timeout that has to be armed */ |
798 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d7718a9d JA |
799 | }; |
800 | ||
801 | struct async_poll { | |
802 | struct io_poll_iocb poll; | |
807abcb0 | 803 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
804 | }; |
805 | ||
f237c30a | 806 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 807 | |
7cbf1722 | 808 | struct io_task_work { |
5b0a6acc PB |
809 | union { |
810 | struct io_wq_work_node node; | |
811 | struct llist_node fallback_node; | |
812 | }; | |
813 | io_req_tw_func_t func; | |
7cbf1722 JA |
814 | }; |
815 | ||
992da01a PB |
816 | enum { |
817 | IORING_RSRC_FILE = 0, | |
818 | IORING_RSRC_BUFFER = 1, | |
819 | }; | |
820 | ||
09bb8394 JA |
821 | /* |
822 | * NOTE! Each of the iocb union members has the file pointer | |
823 | * as the first entry in their struct definition. So you can | |
824 | * access the file pointer through any of the sub-structs, | |
825 | * or directly as just 'ki_filp' in this struct. | |
826 | */ | |
2b188cc1 | 827 | struct io_kiocb { |
221c5eb2 | 828 | union { |
09bb8394 | 829 | struct file *file; |
9adbd45d | 830 | struct io_rw rw; |
221c5eb2 | 831 | struct io_poll_iocb poll; |
9d805892 | 832 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
833 | struct io_accept accept; |
834 | struct io_sync sync; | |
fbf23849 | 835 | struct io_cancel cancel; |
b29472ee | 836 | struct io_timeout timeout; |
0bdf7a2d | 837 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 838 | struct io_connect connect; |
e47293fd | 839 | struct io_sr_msg sr_msg; |
15b71abe | 840 | struct io_open open; |
b5dba59e | 841 | struct io_close close; |
269bbe5f | 842 | struct io_rsrc_update rsrc_update; |
4840e418 | 843 | struct io_fadvise fadvise; |
c1ca757b | 844 | struct io_madvise madvise; |
3e4827b0 | 845 | struct io_epoll epoll; |
7d67af2c | 846 | struct io_splice splice; |
ddf0322d | 847 | struct io_provide_buf pbuf; |
1d9e1288 | 848 | struct io_statx statx; |
36f4fa68 | 849 | struct io_shutdown shutdown; |
80a261fd | 850 | struct io_rename rename; |
14a1143b | 851 | struct io_unlink unlink; |
e34a02dc | 852 | struct io_mkdir mkdir; |
7a8721f8 | 853 | struct io_symlink symlink; |
cf30da90 | 854 | struct io_hardlink hardlink; |
3ca405eb PB |
855 | /* use only after cleaning per-op data, see io_clean_op() */ |
856 | struct io_completion compl; | |
221c5eb2 | 857 | }; |
2b188cc1 | 858 | |
e8c2bc1f JA |
859 | /* opcode allocated if it needs to store data for async defer */ |
860 | void *async_data; | |
d625c6ee | 861 | u8 opcode; |
65a6543d XW |
862 | /* polled IO has completed */ |
863 | u8 iopoll_completed; | |
2b188cc1 | 864 | |
4f4eeba8 | 865 | u16 buf_index; |
9cf7c104 | 866 | u32 result; |
4f4eeba8 | 867 | |
010e8e6b PB |
868 | struct io_ring_ctx *ctx; |
869 | unsigned int flags; | |
abc54d63 | 870 | atomic_t refs; |
010e8e6b PB |
871 | struct task_struct *task; |
872 | u64 user_data; | |
d7718a9d | 873 | |
f2f87370 | 874 | struct io_kiocb *link; |
269bbe5f | 875 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 876 | |
b303fe2e | 877 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 878 | struct list_head inflight_entry; |
5b0a6acc | 879 | struct io_task_work io_task_work; |
010e8e6b PB |
880 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
881 | struct hlist_node hash_node; | |
882 | struct async_poll *apoll; | |
883 | struct io_wq_work work; | |
fe7e3257 | 884 | const struct cred *creds; |
c10d1f98 | 885 | |
eae071c9 PB |
886 | /* store used ubuf, so we can prevent reloading */ |
887 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 888 | }; |
05589553 | 889 | |
13bf43f5 PB |
890 | struct io_tctx_node { |
891 | struct list_head ctx_node; | |
892 | struct task_struct *task; | |
13bf43f5 PB |
893 | struct io_ring_ctx *ctx; |
894 | }; | |
895 | ||
27dc8338 PB |
896 | struct io_defer_entry { |
897 | struct list_head list; | |
898 | struct io_kiocb *req; | |
9cf7c104 | 899 | u32 seq; |
2b188cc1 JA |
900 | }; |
901 | ||
d3656344 | 902 | struct io_op_def { |
d3656344 JA |
903 | /* needs req->file assigned */ |
904 | unsigned needs_file : 1; | |
d3656344 JA |
905 | /* hash wq insertion if file is a regular file */ |
906 | unsigned hash_reg_file : 1; | |
907 | /* unbound wq insertion if file is a non-regular file */ | |
908 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
909 | /* opcode is not supported by this kernel */ |
910 | unsigned not_supported : 1; | |
8a72758c JA |
911 | /* set if opcode supports polled "wait" */ |
912 | unsigned pollin : 1; | |
913 | unsigned pollout : 1; | |
bcda7baa JA |
914 | /* op supports buffer selection */ |
915 | unsigned buffer_select : 1; | |
26f0505a PB |
916 | /* do prep async if is going to be punted */ |
917 | unsigned needs_async_setup : 1; | |
27926b68 JA |
918 | /* should block plug */ |
919 | unsigned plug : 1; | |
e8c2bc1f JA |
920 | /* size of async data needed, if any */ |
921 | unsigned short async_size; | |
d3656344 JA |
922 | }; |
923 | ||
0918682b | 924 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
925 | [IORING_OP_NOP] = {}, |
926 | [IORING_OP_READV] = { | |
d3656344 JA |
927 | .needs_file = 1, |
928 | .unbound_nonreg_file = 1, | |
8a72758c | 929 | .pollin = 1, |
4d954c25 | 930 | .buffer_select = 1, |
26f0505a | 931 | .needs_async_setup = 1, |
27926b68 | 932 | .plug = 1, |
e8c2bc1f | 933 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 934 | }, |
0463b6c5 | 935 | [IORING_OP_WRITEV] = { |
d3656344 JA |
936 | .needs_file = 1, |
937 | .hash_reg_file = 1, | |
938 | .unbound_nonreg_file = 1, | |
8a72758c | 939 | .pollout = 1, |
26f0505a | 940 | .needs_async_setup = 1, |
27926b68 | 941 | .plug = 1, |
e8c2bc1f | 942 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 943 | }, |
0463b6c5 | 944 | [IORING_OP_FSYNC] = { |
d3656344 JA |
945 | .needs_file = 1, |
946 | }, | |
0463b6c5 | 947 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
948 | .needs_file = 1, |
949 | .unbound_nonreg_file = 1, | |
8a72758c | 950 | .pollin = 1, |
27926b68 | 951 | .plug = 1, |
e8c2bc1f | 952 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 953 | }, |
0463b6c5 | 954 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
955 | .needs_file = 1, |
956 | .hash_reg_file = 1, | |
957 | .unbound_nonreg_file = 1, | |
8a72758c | 958 | .pollout = 1, |
27926b68 | 959 | .plug = 1, |
e8c2bc1f | 960 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 961 | }, |
0463b6c5 | 962 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
963 | .needs_file = 1, |
964 | .unbound_nonreg_file = 1, | |
965 | }, | |
0463b6c5 PB |
966 | [IORING_OP_POLL_REMOVE] = {}, |
967 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
968 | .needs_file = 1, |
969 | }, | |
0463b6c5 | 970 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
971 | .needs_file = 1, |
972 | .unbound_nonreg_file = 1, | |
8a72758c | 973 | .pollout = 1, |
26f0505a | 974 | .needs_async_setup = 1, |
e8c2bc1f | 975 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 976 | }, |
0463b6c5 | 977 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
978 | .needs_file = 1, |
979 | .unbound_nonreg_file = 1, | |
8a72758c | 980 | .pollin = 1, |
52de1fe1 | 981 | .buffer_select = 1, |
26f0505a | 982 | .needs_async_setup = 1, |
e8c2bc1f | 983 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 984 | }, |
0463b6c5 | 985 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 986 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 987 | }, |
9c8e11b3 PB |
988 | [IORING_OP_TIMEOUT_REMOVE] = { |
989 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 990 | }, |
0463b6c5 | 991 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
992 | .needs_file = 1, |
993 | .unbound_nonreg_file = 1, | |
8a72758c | 994 | .pollin = 1, |
d3656344 | 995 | }, |
0463b6c5 PB |
996 | [IORING_OP_ASYNC_CANCEL] = {}, |
997 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 998 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 999 | }, |
0463b6c5 | 1000 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1001 | .needs_file = 1, |
1002 | .unbound_nonreg_file = 1, | |
8a72758c | 1003 | .pollout = 1, |
26f0505a | 1004 | .needs_async_setup = 1, |
e8c2bc1f | 1005 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1006 | }, |
0463b6c5 | 1007 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1008 | .needs_file = 1, |
d3656344 | 1009 | }, |
44526bed JA |
1010 | [IORING_OP_OPENAT] = {}, |
1011 | [IORING_OP_CLOSE] = {}, | |
1012 | [IORING_OP_FILES_UPDATE] = {}, | |
1013 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 1014 | [IORING_OP_READ] = { |
3a6820f2 JA |
1015 | .needs_file = 1, |
1016 | .unbound_nonreg_file = 1, | |
8a72758c | 1017 | .pollin = 1, |
bcda7baa | 1018 | .buffer_select = 1, |
27926b68 | 1019 | .plug = 1, |
e8c2bc1f | 1020 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1021 | }, |
0463b6c5 | 1022 | [IORING_OP_WRITE] = { |
3a6820f2 | 1023 | .needs_file = 1, |
7b3188e7 | 1024 | .hash_reg_file = 1, |
3a6820f2 | 1025 | .unbound_nonreg_file = 1, |
8a72758c | 1026 | .pollout = 1, |
27926b68 | 1027 | .plug = 1, |
e8c2bc1f | 1028 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1029 | }, |
0463b6c5 | 1030 | [IORING_OP_FADVISE] = { |
4840e418 | 1031 | .needs_file = 1, |
c1ca757b | 1032 | }, |
44526bed | 1033 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1034 | [IORING_OP_SEND] = { |
fddaface JA |
1035 | .needs_file = 1, |
1036 | .unbound_nonreg_file = 1, | |
8a72758c | 1037 | .pollout = 1, |
fddaface | 1038 | }, |
0463b6c5 | 1039 | [IORING_OP_RECV] = { |
fddaface JA |
1040 | .needs_file = 1, |
1041 | .unbound_nonreg_file = 1, | |
8a72758c | 1042 | .pollin = 1, |
bcda7baa | 1043 | .buffer_select = 1, |
fddaface | 1044 | }, |
0463b6c5 | 1045 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1046 | }, |
3e4827b0 JA |
1047 | [IORING_OP_EPOLL_CTL] = { |
1048 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1049 | }, |
7d67af2c PB |
1050 | [IORING_OP_SPLICE] = { |
1051 | .needs_file = 1, | |
1052 | .hash_reg_file = 1, | |
1053 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1054 | }, |
1055 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1056 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1057 | [IORING_OP_TEE] = { |
1058 | .needs_file = 1, | |
1059 | .hash_reg_file = 1, | |
1060 | .unbound_nonreg_file = 1, | |
1061 | }, | |
36f4fa68 JA |
1062 | [IORING_OP_SHUTDOWN] = { |
1063 | .needs_file = 1, | |
1064 | }, | |
44526bed JA |
1065 | [IORING_OP_RENAMEAT] = {}, |
1066 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1067 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1068 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1069 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1070 | }; |
1071 | ||
0756a869 PB |
1072 | /* requests with any of those set should undergo io_disarm_next() */ |
1073 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1074 | ||
7a612350 | 1075 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1076 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1077 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1078 | struct task_struct *task, | |
3dd0c97a | 1079 | bool cancel_all); |
78cc687b | 1080 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1081 | |
d4d19c19 PB |
1082 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1083 | long res, unsigned int cflags); | |
ec9c02ad | 1084 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1085 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1086 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1087 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1088 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1089 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1090 | unsigned nr_args); |
68fb8979 | 1091 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1092 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1093 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1094 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1095 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1096 | |
907d1df3 | 1097 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1098 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1099 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1100 | |
b9445598 PB |
1101 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1102 | unsigned int issue_flags, u32 slot_index); | |
f1042b6c | 1103 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1104 | |
2b188cc1 JA |
1105 | static struct kmem_cache *req_cachep; |
1106 | ||
0918682b | 1107 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1108 | |
1109 | struct sock *io_uring_get_socket(struct file *file) | |
1110 | { | |
1111 | #if defined(CONFIG_UNIX) | |
1112 | if (file->f_op == &io_uring_fops) { | |
1113 | struct io_ring_ctx *ctx = file->private_data; | |
1114 | ||
1115 | return ctx->ring_sock->sk; | |
1116 | } | |
1117 | #endif | |
1118 | return NULL; | |
1119 | } | |
1120 | EXPORT_SYMBOL(io_uring_get_socket); | |
1121 | ||
f237c30a PB |
1122 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1123 | { | |
1124 | if (!*locked) { | |
1125 | mutex_lock(&ctx->uring_lock); | |
1126 | *locked = true; | |
1127 | } | |
1128 | } | |
1129 | ||
f2f87370 PB |
1130 | #define io_for_each_link(pos, head) \ |
1131 | for (pos = (head); pos; pos = pos->link) | |
1132 | ||
21c843d5 PB |
1133 | /* |
1134 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1135 | * see commit f958d7b528b1 for details. | |
1136 | */ | |
1137 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1138 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1139 | ||
1140 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1141 | { | |
20e60a38 | 1142 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1143 | return atomic_inc_not_zero(&req->refs); |
1144 | } | |
1145 | ||
21c843d5 PB |
1146 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1147 | { | |
20e60a38 PB |
1148 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1149 | return true; | |
1150 | ||
21c843d5 PB |
1151 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1152 | return atomic_dec_and_test(&req->refs); | |
1153 | } | |
1154 | ||
1155 | static inline void req_ref_put(struct io_kiocb *req) | |
1156 | { | |
20e60a38 | 1157 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1158 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1159 | } | |
1160 | ||
1161 | static inline void req_ref_get(struct io_kiocb *req) | |
1162 | { | |
20e60a38 | 1163 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1164 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1165 | atomic_inc(&req->refs); | |
1166 | } | |
1167 | ||
48dcd38d | 1168 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1169 | { |
1170 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1171 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1172 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1173 | } |
1174 | } | |
1175 | ||
48dcd38d PB |
1176 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1177 | { | |
1178 | __io_req_set_refcount(req, 1); | |
1179 | } | |
1180 | ||
b895c9a6 | 1181 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1182 | { |
1183 | struct io_ring_ctx *ctx = req->ctx; | |
1184 | ||
269bbe5f | 1185 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1186 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1187 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1188 | } |
1189 | } | |
1190 | ||
f70865db PB |
1191 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1192 | { | |
1193 | bool got = percpu_ref_tryget(ref); | |
1194 | ||
1195 | /* already at zero, wait for ->release() */ | |
1196 | if (!got) | |
1197 | wait_for_completion(compl); | |
1198 | percpu_ref_resurrect(ref); | |
1199 | if (got) | |
1200 | percpu_ref_put(ref); | |
1201 | } | |
1202 | ||
3dd0c97a PB |
1203 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1204 | bool cancel_all) | |
08d23634 PB |
1205 | { |
1206 | struct io_kiocb *req; | |
1207 | ||
68207680 | 1208 | if (task && head->task != task) |
08d23634 | 1209 | return false; |
3dd0c97a | 1210 | if (cancel_all) |
08d23634 PB |
1211 | return true; |
1212 | ||
1213 | io_for_each_link(req, head) { | |
b05a1bcd | 1214 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1215 | return true; |
08d23634 PB |
1216 | } |
1217 | return false; | |
1218 | } | |
1219 | ||
93d2bcd2 | 1220 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1221 | { |
93d2bcd2 | 1222 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1223 | } |
4a38aed2 | 1224 | |
a8295b98 HX |
1225 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1226 | { | |
1227 | req_set_fail(req); | |
1228 | req->result = res; | |
1229 | } | |
1230 | ||
2b188cc1 JA |
1231 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1232 | { | |
1233 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1234 | ||
0f158b4c | 1235 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1236 | } |
1237 | ||
8eb7e2d0 PB |
1238 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1239 | { | |
1240 | return !req->timeout.off; | |
1241 | } | |
1242 | ||
f56165e6 PB |
1243 | static void io_fallback_req_func(struct work_struct *work) |
1244 | { | |
1245 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1246 | fallback_work.work); | |
1247 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1248 | struct io_kiocb *req, *tmp; | |
f237c30a | 1249 | bool locked = false; |
f56165e6 PB |
1250 | |
1251 | percpu_ref_get(&ctx->refs); | |
1252 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1253 | req->io_task_work.func(req, &locked); |
5636c00d | 1254 | |
f237c30a PB |
1255 | if (locked) { |
1256 | if (ctx->submit_state.compl_nr) | |
1257 | io_submit_flush_completions(ctx); | |
1258 | mutex_unlock(&ctx->uring_lock); | |
1259 | } | |
f56165e6 | 1260 | percpu_ref_put(&ctx->refs); |
f237c30a | 1261 | |
f56165e6 PB |
1262 | } |
1263 | ||
2b188cc1 JA |
1264 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1265 | { | |
1266 | struct io_ring_ctx *ctx; | |
78076bb6 | 1267 | int hash_bits; |
2b188cc1 JA |
1268 | |
1269 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1270 | if (!ctx) | |
1271 | return NULL; | |
1272 | ||
78076bb6 JA |
1273 | /* |
1274 | * Use 5 bits less than the max cq entries, that should give us around | |
1275 | * 32 entries per hash list if totally full and uniformly spread. | |
1276 | */ | |
1277 | hash_bits = ilog2(p->cq_entries); | |
1278 | hash_bits -= 5; | |
1279 | if (hash_bits <= 0) | |
1280 | hash_bits = 1; | |
1281 | ctx->cancel_hash_bits = hash_bits; | |
1282 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1283 | GFP_KERNEL); | |
1284 | if (!ctx->cancel_hash) | |
1285 | goto err; | |
1286 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1287 | ||
6224843d PB |
1288 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1289 | if (!ctx->dummy_ubuf) | |
1290 | goto err; | |
1291 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1292 | ctx->dummy_ubuf->ubuf = -1UL; | |
1293 | ||
21482896 | 1294 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1295 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1296 | goto err; | |
2b188cc1 JA |
1297 | |
1298 | ctx->flags = p->flags; | |
90554200 | 1299 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1300 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1301 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1302 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1303 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1304 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1305 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1306 | mutex_init(&ctx->uring_lock); |
311997b3 | 1307 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1308 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1309 | spin_lock_init(&ctx->timeout_lock); |
540e32a0 | 1310 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1311 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1312 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1313 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1314 | spin_lock_init(&ctx->rsrc_ref_lock); |
1315 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1316 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1317 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1318 | INIT_LIST_HEAD(&ctx->tctx_list); |
cd0ca2e0 | 1319 | INIT_LIST_HEAD(&ctx->submit_state.free_list); |
d0acdee2 | 1320 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1321 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1322 | return ctx; |
206aefde | 1323 | err: |
6224843d | 1324 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1325 | kfree(ctx->cancel_hash); |
206aefde JA |
1326 | kfree(ctx); |
1327 | return NULL; | |
2b188cc1 JA |
1328 | } |
1329 | ||
8f6ed49a PB |
1330 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1331 | { | |
1332 | struct io_rings *r = ctx->rings; | |
1333 | ||
1334 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1335 | ctx->cq_extra--; | |
1336 | } | |
1337 | ||
9cf7c104 | 1338 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1339 | { |
2bc9930e JA |
1340 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1341 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1342 | |
8f6ed49a | 1343 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1344 | } |
de0617e4 | 1345 | |
9d858b21 | 1346 | return false; |
de0617e4 JA |
1347 | } |
1348 | ||
c97d8a0f PB |
1349 | #define FFS_ASYNC_READ 0x1UL |
1350 | #define FFS_ASYNC_WRITE 0x2UL | |
1351 | #ifdef CONFIG_64BIT | |
1352 | #define FFS_ISREG 0x4UL | |
1353 | #else | |
1354 | #define FFS_ISREG 0x0UL | |
1355 | #endif | |
1356 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1357 | ||
1358 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1359 | { | |
1360 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1361 | } | |
1362 | ||
ce3d5aae PB |
1363 | static void io_req_track_inflight(struct io_kiocb *req) |
1364 | { | |
ce3d5aae | 1365 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1366 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1367 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1368 | } |
1369 | } | |
1370 | ||
906c6caa PB |
1371 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
1372 | { | |
1373 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
1374 | } | |
1375 | ||
fd08e530 PB |
1376 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1377 | { | |
906c6caa PB |
1378 | if (WARN_ON_ONCE(!req->link)) |
1379 | return NULL; | |
1380 | ||
4d13d1a4 PB |
1381 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1382 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1383 | |
1384 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1385 | io_req_set_refcount(req); |
4d13d1a4 PB |
1386 | __io_req_set_refcount(req->link, 2); |
1387 | return req->link; | |
fd08e530 PB |
1388 | } |
1389 | ||
1390 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1391 | { | |
4d13d1a4 | 1392 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1393 | return NULL; |
1394 | return __io_prep_linked_timeout(req); | |
1395 | } | |
1396 | ||
1e6fa521 JA |
1397 | static void io_prep_async_work(struct io_kiocb *req) |
1398 | { | |
1399 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1400 | struct io_ring_ctx *ctx = req->ctx; |
1401 | ||
b8e64b53 PB |
1402 | if (!(req->flags & REQ_F_CREDS)) { |
1403 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1404 | req->creds = get_current_cred(); |
b8e64b53 | 1405 | } |
003e8dcc | 1406 | |
e1d675df PB |
1407 | req->work.list.next = NULL; |
1408 | req->work.flags = 0; | |
feaadc4f PB |
1409 | if (req->flags & REQ_F_FORCE_ASYNC) |
1410 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1411 | ||
1e6fa521 JA |
1412 | if (req->flags & REQ_F_ISREG) { |
1413 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1414 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1415 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1416 | if (def->unbound_nonreg_file) |
1417 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1418 | } | |
e1d675df PB |
1419 | |
1420 | switch (req->opcode) { | |
1421 | case IORING_OP_SPLICE: | |
1422 | case IORING_OP_TEE: | |
e1d675df PB |
1423 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1424 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1425 | break; | |
1426 | } | |
561fb04a | 1427 | } |
cccf0ee8 | 1428 | |
cbdcb435 | 1429 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1430 | { |
cbdcb435 | 1431 | struct io_kiocb *cur; |
54a91f3b | 1432 | |
44eff40a PB |
1433 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1434 | struct io_ring_ctx *ctx = req->ctx; | |
1435 | ||
79ebeaee | 1436 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1437 | io_for_each_link(cur, req) |
1438 | io_prep_async_work(cur); | |
79ebeaee | 1439 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1440 | } else { |
1441 | io_for_each_link(cur, req) | |
1442 | io_prep_async_work(cur); | |
1443 | } | |
561fb04a JA |
1444 | } |
1445 | ||
f237c30a | 1446 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
561fb04a | 1447 | { |
a197f664 | 1448 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1449 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1450 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1451 | |
f237c30a PB |
1452 | /* must not take the lock, NULL it as a precaution */ |
1453 | locked = NULL; | |
1454 | ||
3bfe6106 JA |
1455 | BUG_ON(!tctx); |
1456 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1457 | |
cbdcb435 PB |
1458 | /* init ->work of the whole link before punting */ |
1459 | io_prep_async_link(req); | |
991468dc JA |
1460 | |
1461 | /* | |
1462 | * Not expected to happen, but if we do have a bug where this _can_ | |
1463 | * happen, catch it here and ensure the request is marked as | |
1464 | * canceled. That will make io-wq go through the usual work cancel | |
1465 | * procedure rather than attempt to run this request (or create a new | |
1466 | * worker for it). | |
1467 | */ | |
1468 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1469 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1470 | ||
d07f1e8a PB |
1471 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1472 | &req->work, req->flags); | |
ebf93667 | 1473 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1474 | if (link) |
1475 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1476 | } |
1477 | ||
1ee4160c | 1478 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1479 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1480 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1481 | { |
e8c2bc1f | 1482 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1483 | |
fd9c7bc5 | 1484 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1485 | if (status) |
1486 | req_set_fail(req); | |
01cec8c1 PB |
1487 | atomic_set(&req->ctx->cq_timeouts, |
1488 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1489 | list_del_init(&req->timeout.list); |
d4d19c19 | 1490 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1491 | io_put_req_deferred(req); |
5262f567 JA |
1492 | } |
1493 | } | |
1494 | ||
441b8a78 | 1495 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1496 | { |
441b8a78 | 1497 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1498 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1499 | struct io_defer_entry, list); | |
de0617e4 | 1500 | |
9cf7c104 | 1501 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1502 | break; |
27dc8338 | 1503 | list_del_init(&de->list); |
907d1df3 | 1504 | io_req_task_queue(de->req); |
27dc8338 | 1505 | kfree(de); |
441b8a78 | 1506 | } |
04518945 PB |
1507 | } |
1508 | ||
360428f8 | 1509 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1510 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1511 | { |
441b8a78 | 1512 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1513 | |
79ebeaee | 1514 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1515 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1516 | u32 events_needed, events_got; |
360428f8 | 1517 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1518 | struct io_kiocb, timeout.list); |
de0617e4 | 1519 | |
8eb7e2d0 | 1520 | if (io_is_timeout_noseq(req)) |
360428f8 | 1521 | break; |
f010505b MDG |
1522 | |
1523 | /* | |
1524 | * Since seq can easily wrap around over time, subtract | |
1525 | * the last seq at which timeouts were flushed before comparing. | |
1526 | * Assuming not more than 2^31-1 events have happened since, | |
1527 | * these subtractions won't have wrapped, so we can check if | |
1528 | * target is in [last_seq, current_seq] by comparing the two. | |
1529 | */ | |
1530 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1531 | events_got = seq - ctx->cq_last_tm_flush; | |
1532 | if (events_got < events_needed) | |
360428f8 | 1533 | break; |
bfe68a22 | 1534 | |
135fcde8 | 1535 | list_del_init(&req->timeout.list); |
1ee4160c | 1536 | io_kill_timeout(req, 0); |
f18ee4cf | 1537 | } |
f010505b | 1538 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1539 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1540 | } |
5262f567 | 1541 | |
2335f6f5 | 1542 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1543 | { |
2335f6f5 PB |
1544 | if (ctx->off_timeout_used) |
1545 | io_flush_timeouts(ctx); | |
1546 | if (ctx->drain_active) | |
1547 | io_queue_deferred(ctx); | |
1548 | } | |
1549 | ||
1550 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1551 | { | |
1552 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1553 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1554 | /* order cqe stores with ring update */ |
1555 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1556 | } |
1557 | ||
90554200 JA |
1558 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1559 | { | |
1560 | struct io_rings *r = ctx->rings; | |
1561 | ||
a566c556 | 1562 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1563 | } |
1564 | ||
888aae2e PB |
1565 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1566 | { | |
1567 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1568 | } | |
1569 | ||
d068b506 | 1570 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1571 | { |
75b28aff | 1572 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1573 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1574 | |
115e12e5 SB |
1575 | /* |
1576 | * writes to the cq entry need to come after reading head; the | |
1577 | * control dependency is enough as we're using WRITE_ONCE to | |
1578 | * fill the cq entry | |
1579 | */ | |
a566c556 | 1580 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1581 | return NULL; |
1582 | ||
888aae2e | 1583 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1584 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1585 | } |
1586 | ||
f2842ab5 JA |
1587 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1588 | { | |
44c769de | 1589 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1590 | return false; |
7e55a19c SG |
1591 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1592 | return false; | |
44c769de | 1593 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1594 | } |
1595 | ||
2c5d763c JA |
1596 | /* |
1597 | * This should only get called when at least one event has been posted. | |
1598 | * Some applications rely on the eventfd notification count only changing | |
1599 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1600 | * 1:1 relationship between how many times this function is called (and | |
1601 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1602 | */ | |
b41e9852 | 1603 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1604 | { |
5fd46178 JA |
1605 | /* |
1606 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1607 | * io_should_wake() handle the termination of the loop and only | |
1608 | * wake as many waiters as we need to. | |
1609 | */ | |
1610 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1611 | wake_up_all(&ctx->cq_wait); | |
534ca6d6 JA |
1612 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1613 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1614 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1615 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1616 | if (waitqueue_active(&ctx->poll_wait)) { |
1617 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1618 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1619 | } | |
1d7bb1d5 JA |
1620 | } |
1621 | ||
80c18e4a PB |
1622 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1623 | { | |
c57a91fb PB |
1624 | /* see waitqueue_active() comment */ |
1625 | smp_mb(); | |
1626 | ||
80c18e4a | 1627 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1628 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1629 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1630 | } |
1631 | if (io_should_trigger_evfd(ctx)) | |
1632 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1633 | if (waitqueue_active(&ctx->poll_wait)) { |
1634 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1635 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1636 | } | |
80c18e4a PB |
1637 | } |
1638 | ||
c4a2ed72 | 1639 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1640 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1641 | { |
b18032bb | 1642 | bool all_flushed, posted; |
1d7bb1d5 | 1643 | |
a566c556 | 1644 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1645 | return false; |
1d7bb1d5 | 1646 | |
b18032bb | 1647 | posted = false; |
79ebeaee | 1648 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1649 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1650 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1651 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1652 | |
1d7bb1d5 JA |
1653 | if (!cqe && !force) |
1654 | break; | |
6c2450ae PB |
1655 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1656 | struct io_overflow_cqe, list); | |
1657 | if (cqe) | |
1658 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1659 | else | |
8f6ed49a PB |
1660 | io_account_cq_overflow(ctx); |
1661 | ||
b18032bb | 1662 | posted = true; |
6c2450ae PB |
1663 | list_del(&ocqe->list); |
1664 | kfree(ocqe); | |
1d7bb1d5 JA |
1665 | } |
1666 | ||
09e88404 PB |
1667 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1668 | if (all_flushed) { | |
5ed7a37d | 1669 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1670 | WRITE_ONCE(ctx->rings->sq_flags, |
1671 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1672 | } |
46930143 | 1673 | |
b18032bb JA |
1674 | if (posted) |
1675 | io_commit_cqring(ctx); | |
79ebeaee | 1676 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1677 | if (posted) |
1678 | io_cqring_ev_posted(ctx); | |
09e88404 | 1679 | return all_flushed; |
1d7bb1d5 JA |
1680 | } |
1681 | ||
90f67366 | 1682 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1683 | { |
ca0a2651 JA |
1684 | bool ret = true; |
1685 | ||
5ed7a37d | 1686 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1687 | /* iopoll syncs against uring_lock, not completion_lock */ |
1688 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1689 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1690 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1691 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1692 | mutex_unlock(&ctx->uring_lock); | |
1693 | } | |
ca0a2651 JA |
1694 | |
1695 | return ret; | |
6c503150 PB |
1696 | } |
1697 | ||
6a290a14 PB |
1698 | /* must to be called somewhat shortly after putting a request */ |
1699 | static inline void io_put_task(struct task_struct *task, int nr) | |
1700 | { | |
1701 | struct io_uring_task *tctx = task->io_uring; | |
1702 | ||
e98e49b2 PB |
1703 | if (likely(task == current)) { |
1704 | tctx->cached_refs += nr; | |
1705 | } else { | |
1706 | percpu_counter_sub(&tctx->inflight, nr); | |
1707 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1708 | wake_up(&tctx->wait); | |
1709 | put_task_struct_many(task, nr); | |
1710 | } | |
6a290a14 PB |
1711 | } |
1712 | ||
9a10867a PB |
1713 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1714 | { | |
1715 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1716 | ||
1717 | percpu_counter_add(&tctx->inflight, refill); | |
1718 | refcount_add(refill, ¤t->usage); | |
1719 | tctx->cached_refs += refill; | |
1720 | } | |
1721 | ||
1722 | static inline void io_get_task_refs(int nr) | |
1723 | { | |
1724 | struct io_uring_task *tctx = current->io_uring; | |
1725 | ||
1726 | tctx->cached_refs -= nr; | |
1727 | if (unlikely(tctx->cached_refs < 0)) | |
1728 | io_task_refs_refill(tctx); | |
1729 | } | |
1730 | ||
d4d19c19 PB |
1731 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1732 | long res, unsigned int cflags) | |
2b188cc1 | 1733 | { |
cce4b8b0 | 1734 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1735 | |
cce4b8b0 PB |
1736 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1737 | if (!ocqe) { | |
1738 | /* | |
1739 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1740 | * or cannot allocate an overflow entry, then we need to drop it | |
1741 | * on the floor. | |
1742 | */ | |
8f6ed49a | 1743 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1744 | return false; |
2b188cc1 | 1745 | } |
cce4b8b0 | 1746 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1747 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1748 | WRITE_ONCE(ctx->rings->sq_flags, |
1749 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1750 | ||
cce4b8b0 | 1751 | } |
d4d19c19 | 1752 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1753 | ocqe->cqe.res = res; |
1754 | ocqe->cqe.flags = cflags; | |
1755 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1756 | return true; | |
2b188cc1 JA |
1757 | } |
1758 | ||
d4d19c19 PB |
1759 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1760 | long res, unsigned int cflags) | |
2b188cc1 JA |
1761 | { |
1762 | struct io_uring_cqe *cqe; | |
1763 | ||
d4d19c19 | 1764 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1765 | |
2b188cc1 JA |
1766 | /* |
1767 | * If we can't get a cq entry, userspace overflowed the | |
1768 | * submission (by quite a lot). Increment the overflow count in | |
1769 | * the ring. | |
1770 | */ | |
d068b506 | 1771 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1772 | if (likely(cqe)) { |
d4d19c19 | 1773 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1774 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1775 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1776 | return true; |
2b188cc1 | 1777 | } |
d4d19c19 | 1778 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1779 | } |
1780 | ||
8d13326e | 1781 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1782 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1783 | long res, unsigned int cflags) | |
bcda7baa | 1784 | { |
d4d19c19 | 1785 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1786 | } |
1787 | ||
7a612350 PB |
1788 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1789 | unsigned int cflags) | |
2b188cc1 | 1790 | { |
78e19bbe | 1791 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1792 | |
79ebeaee | 1793 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1794 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1795 | /* |
1796 | * If we're the last reference to this request, add to our locked | |
1797 | * free_list cache. | |
1798 | */ | |
de9b4cca | 1799 | if (req_ref_put_and_test(req)) { |
7a612350 | 1800 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1801 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1802 | io_disarm_next(req); |
1803 | if (req->link) { | |
1804 | io_req_task_queue(req->link); | |
1805 | req->link = NULL; | |
1806 | } | |
1807 | } | |
c7dae4ba JA |
1808 | io_dismantle_req(req); |
1809 | io_put_task(req->task, 1); | |
bb943b82 | 1810 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
d0acdee2 | 1811 | ctx->locked_free_nr++; |
180f829f PB |
1812 | } else { |
1813 | if (!percpu_ref_tryget(&ctx->refs)) | |
1814 | req = NULL; | |
1815 | } | |
7a612350 | 1816 | io_commit_cqring(ctx); |
79ebeaee | 1817 | spin_unlock(&ctx->completion_lock); |
7a612350 | 1818 | |
180f829f PB |
1819 | if (req) { |
1820 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1821 | percpu_ref_put(&ctx->refs); |
180f829f | 1822 | } |
229a7b63 JA |
1823 | } |
1824 | ||
4e3d9ff9 JA |
1825 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1826 | { | |
c854357b | 1827 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1828 | } |
1829 | ||
a38d68db | 1830 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1831 | unsigned int cflags) |
229a7b63 | 1832 | { |
4e3d9ff9 | 1833 | if (io_req_needs_clean(req)) |
68fb8979 | 1834 | io_clean_op(req); |
a38d68db PB |
1835 | req->result = res; |
1836 | req->compl.cflags = cflags; | |
e342c807 | 1837 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1838 | } |
1839 | ||
889fca73 PB |
1840 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1841 | long res, unsigned cflags) | |
bcda7baa | 1842 | { |
889fca73 PB |
1843 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1844 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1845 | else |
c7dae4ba | 1846 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1847 | } |
1848 | ||
a38d68db | 1849 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1850 | { |
889fca73 | 1851 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1852 | } |
1853 | ||
f41db273 PB |
1854 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1855 | { | |
93d2bcd2 | 1856 | req_set_fail(req); |
f41db273 PB |
1857 | io_req_complete_post(req, res, 0); |
1858 | } | |
1859 | ||
c6d3d9cb PB |
1860 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1861 | { | |
1862 | /* | |
1863 | * We don't submit, fail them all, for that replace hardlinks with | |
1864 | * normal links. Extra REQ_F_LINK is tolerated. | |
1865 | */ | |
1866 | req->flags &= ~REQ_F_HARDLINK; | |
1867 | req->flags |= REQ_F_LINK; | |
1868 | io_req_complete_failed(req, req->result); | |
1869 | } | |
1870 | ||
864ea921 PB |
1871 | /* |
1872 | * Don't initialise the fields below on every allocation, but do that in | |
1873 | * advance and keep them valid across allocations. | |
1874 | */ | |
1875 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1876 | { | |
1877 | req->ctx = ctx; | |
1878 | req->link = NULL; | |
1879 | req->async_data = NULL; | |
1880 | /* not necessary, but safer to zero */ | |
1881 | req->result = 0; | |
1882 | } | |
1883 | ||
dac7a098 | 1884 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1885 | struct io_submit_state *state) |
dac7a098 | 1886 | { |
79ebeaee | 1887 | spin_lock(&ctx->completion_lock); |
cd0ca2e0 | 1888 | list_splice_init(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1889 | ctx->locked_free_nr = 0; |
79ebeaee | 1890 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1891 | } |
1892 | ||
dd78f492 | 1893 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1894 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1895 | { |
c7dae4ba | 1896 | struct io_submit_state *state = &ctx->submit_state; |
dd78f492 | 1897 | int nr; |
0ddf92e8 | 1898 | |
c7dae4ba JA |
1899 | /* |
1900 | * If we have more than a batch's worth of requests in our IRQ side | |
1901 | * locked cache, grab the lock and move them over to our submission | |
1902 | * side cache. | |
1903 | */ | |
d0acdee2 | 1904 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1905 | io_flush_cached_locked_reqs(ctx, state); |
0ddf92e8 | 1906 | |
dd78f492 | 1907 | nr = state->free_reqs; |
cd0ca2e0 PB |
1908 | while (!list_empty(&state->free_list)) { |
1909 | struct io_kiocb *req = list_first_entry(&state->free_list, | |
bb943b82 | 1910 | struct io_kiocb, inflight_entry); |
dd78f492 | 1911 | |
bb943b82 | 1912 | list_del(&req->inflight_entry); |
dd78f492 PB |
1913 | state->reqs[nr++] = req; |
1914 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1915 | break; |
1b4c351f JA |
1916 | } |
1917 | ||
dd78f492 PB |
1918 | state->free_reqs = nr; |
1919 | return nr != 0; | |
0ddf92e8 JA |
1920 | } |
1921 | ||
5d5901a3 PB |
1922 | /* |
1923 | * A request might get retired back into the request caches even before opcode | |
1924 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
1925 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
1926 | * and with extra caution to not get a request that is still worked on. | |
1927 | */ | |
e5d1bc0a | 1928 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
5d5901a3 | 1929 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 1930 | { |
e5d1bc0a | 1931 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 PB |
1932 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
1933 | int ret, i; | |
e5d1bc0a | 1934 | |
fe7e3257 | 1935 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1936 | |
864ea921 PB |
1937 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
1938 | goto got_req; | |
e5d1bc0a | 1939 | |
864ea921 PB |
1940 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1941 | state->reqs); | |
fd6fab2c | 1942 | |
864ea921 PB |
1943 | /* |
1944 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1945 | * retry single alloc to be on the safe side. | |
1946 | */ | |
1947 | if (unlikely(ret <= 0)) { | |
1948 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1949 | if (!state->reqs[0]) | |
1950 | return NULL; | |
1951 | ret = 1; | |
2b188cc1 | 1952 | } |
864ea921 PB |
1953 | |
1954 | for (i = 0; i < ret; i++) | |
1955 | io_preinit_req(state->reqs[i], ctx); | |
1956 | state->free_reqs = ret; | |
e5d1bc0a | 1957 | got_req: |
291b2821 PB |
1958 | state->free_reqs--; |
1959 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1960 | } |
1961 | ||
e1d767f0 | 1962 | static inline void io_put_file(struct file *file) |
8da11c19 | 1963 | { |
e1d767f0 | 1964 | if (file) |
8da11c19 PB |
1965 | fput(file); |
1966 | } | |
1967 | ||
4edf20f9 | 1968 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1969 | { |
094bae49 | 1970 | unsigned int flags = req->flags; |
929a3af9 | 1971 | |
3a0a6902 PB |
1972 | if (io_req_needs_clean(req)) |
1973 | io_clean_op(req); | |
e1d767f0 PB |
1974 | if (!(flags & REQ_F_FIXED_FILE)) |
1975 | io_put_file(req->file); | |
269bbe5f BM |
1976 | if (req->fixed_rsrc_refs) |
1977 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1978 | if (req->async_data) { |
094bae49 | 1979 | kfree(req->async_data); |
99ebe4ef PB |
1980 | req->async_data = NULL; |
1981 | } | |
e65ef56d JA |
1982 | } |
1983 | ||
216578e5 | 1984 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1985 | { |
51a4cc11 | 1986 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1987 | |
216578e5 | 1988 | io_dismantle_req(req); |
7c660731 | 1989 | io_put_task(req->task, 1); |
c6ca97b3 | 1990 | |
79ebeaee | 1991 | spin_lock(&ctx->completion_lock); |
bb943b82 | 1992 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
c34b025f | 1993 | ctx->locked_free_nr++; |
79ebeaee | 1994 | spin_unlock(&ctx->completion_lock); |
c34b025f | 1995 | |
ecfc5177 | 1996 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1997 | } |
1998 | ||
f2f87370 PB |
1999 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2000 | { | |
2001 | struct io_kiocb *nxt = req->link; | |
2002 | ||
2003 | req->link = nxt->link; | |
2004 | nxt->link = NULL; | |
2005 | } | |
2006 | ||
33cc89a9 PB |
2007 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2008 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2009 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2010 | { |
33cc89a9 | 2011 | struct io_kiocb *link = req->link; |
f2f87370 | 2012 | |
b97e736a | 2013 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2014 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2015 | |
f2f87370 | 2016 | io_remove_next_linked(req); |
90cd7e42 | 2017 | link->timeout.head = NULL; |
fd9c7bc5 | 2018 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2019 | list_del(&link->timeout.list); |
d4d19c19 PB |
2020 | io_cqring_fill_event(link->ctx, link->user_data, |
2021 | -ECANCELED, 0); | |
91c2f697 | 2022 | io_put_req_deferred(link); |
d4729fbd | 2023 | return true; |
c9abd7ad PB |
2024 | } |
2025 | } | |
d4729fbd | 2026 | return false; |
7c86ffee PB |
2027 | } |
2028 | ||
d148ca4b | 2029 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2030 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2031 | { |
33cc89a9 | 2032 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 2033 | |
f2f87370 | 2034 | req->link = NULL; |
f2f87370 | 2035 | while (link) { |
a8295b98 HX |
2036 | long res = -ECANCELED; |
2037 | ||
2038 | if (link->flags & REQ_F_FAIL) | |
2039 | res = link->result; | |
2040 | ||
f2f87370 PB |
2041 | nxt = link->link; |
2042 | link->link = NULL; | |
2665abfd | 2043 | |
f2f87370 | 2044 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2045 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2046 | io_put_req_deferred(link); |
f2f87370 | 2047 | link = nxt; |
9e645e11 | 2048 | } |
33cc89a9 | 2049 | } |
9e645e11 | 2050 | |
33cc89a9 PB |
2051 | static bool io_disarm_next(struct io_kiocb *req) |
2052 | __must_hold(&req->ctx->completion_lock) | |
2053 | { | |
2054 | bool posted = false; | |
2055 | ||
0756a869 PB |
2056 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2057 | struct io_kiocb *link = req->link; | |
2058 | ||
906c6caa | 2059 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2060 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2061 | io_remove_next_linked(req); | |
2062 | io_cqring_fill_event(link->ctx, link->user_data, | |
2063 | -ECANCELED, 0); | |
2064 | io_put_req_deferred(link); | |
2065 | posted = true; | |
2066 | } | |
2067 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2068 | struct io_ring_ctx *ctx = req->ctx; |
2069 | ||
2070 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2071 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2072 | spin_unlock_irq(&ctx->timeout_lock); |
2073 | } | |
93d2bcd2 | 2074 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2075 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2076 | posted |= (req->link != NULL); |
2077 | io_fail_links(req); | |
2078 | } | |
2079 | return posted; | |
9e645e11 JA |
2080 | } |
2081 | ||
3fa5e0f3 | 2082 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2083 | { |
33cc89a9 | 2084 | struct io_kiocb *nxt; |
944e58bf | 2085 | |
9e645e11 JA |
2086 | /* |
2087 | * If LINK is set, we have dependent requests in this chain. If we | |
2088 | * didn't fail this request, queue the first one up, moving any other | |
2089 | * dependencies to the next request. In case of failure, fail the rest | |
2090 | * of the chain. | |
2091 | */ | |
0756a869 | 2092 | if (req->flags & IO_DISARM_MASK) { |
33cc89a9 | 2093 | struct io_ring_ctx *ctx = req->ctx; |
33cc89a9 PB |
2094 | bool posted; |
2095 | ||
79ebeaee | 2096 | spin_lock(&ctx->completion_lock); |
33cc89a9 PB |
2097 | posted = io_disarm_next(req); |
2098 | if (posted) | |
2099 | io_commit_cqring(req->ctx); | |
79ebeaee | 2100 | spin_unlock(&ctx->completion_lock); |
33cc89a9 PB |
2101 | if (posted) |
2102 | io_cqring_ev_posted(ctx); | |
f2f87370 | 2103 | } |
33cc89a9 PB |
2104 | nxt = req->link; |
2105 | req->link = NULL; | |
2106 | return nxt; | |
4d7dd462 | 2107 | } |
9e645e11 | 2108 | |
f2f87370 | 2109 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2110 | { |
cdbff982 | 2111 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
2112 | return NULL; |
2113 | return __io_req_find_next(req); | |
2114 | } | |
2115 | ||
f237c30a | 2116 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2117 | { |
2118 | if (!ctx) | |
2119 | return; | |
f237c30a | 2120 | if (*locked) { |
99c8bc52 HX |
2121 | if (ctx->submit_state.compl_nr) |
2122 | io_submit_flush_completions(ctx); | |
2c32395d | 2123 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2124 | *locked = false; |
2c32395d PB |
2125 | } |
2126 | percpu_ref_put(&ctx->refs); | |
2127 | } | |
2128 | ||
7cbf1722 | 2129 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2130 | { |
f237c30a | 2131 | bool locked = false; |
ebd0df2e | 2132 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2133 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2134 | task_work); | |
c40f6379 | 2135 | |
16f72070 | 2136 | while (1) { |
3f18407d PB |
2137 | struct io_wq_work_node *node; |
2138 | ||
8d4ad41e PB |
2139 | if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr) |
2140 | io_submit_flush_completions(ctx); | |
2141 | ||
3f18407d | 2142 | spin_lock_irq(&tctx->task_lock); |
c6538be9 | 2143 | node = tctx->task_list.first; |
3f18407d | 2144 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2145 | if (!node) |
2146 | tctx->task_running = false; | |
3f18407d | 2147 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2148 | if (!node) |
2149 | break; | |
3f18407d | 2150 | |
6294f368 | 2151 | do { |
3f18407d PB |
2152 | struct io_wq_work_node *next = node->next; |
2153 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2154 | io_task_work.node); | |
2155 | ||
2156 | if (req->ctx != ctx) { | |
f237c30a | 2157 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2158 | ctx = req->ctx; |
126180b9 PB |
2159 | /* if not contended, grab and improve batching */ |
2160 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2161 | percpu_ref_get(&ctx->refs); |
2162 | } | |
f237c30a | 2163 | req->io_task_work.func(req, &locked); |
3f18407d | 2164 | node = next; |
6294f368 PB |
2165 | } while (node); |
2166 | ||
7cbf1722 | 2167 | cond_resched(); |
3f18407d | 2168 | } |
ebd0df2e | 2169 | |
f237c30a | 2170 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2171 | } |
2172 | ||
e09ee510 | 2173 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2174 | { |
c15b79de | 2175 | struct task_struct *tsk = req->task; |
7cbf1722 | 2176 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2177 | enum task_work_notify_mode notify; |
e09ee510 | 2178 | struct io_wq_work_node *node; |
0b81e80c | 2179 | unsigned long flags; |
6294f368 | 2180 | bool running; |
7cbf1722 JA |
2181 | |
2182 | WARN_ON_ONCE(!tctx); | |
2183 | ||
0b81e80c | 2184 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2185 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2186 | running = tctx->task_running; |
2187 | if (!running) | |
2188 | tctx->task_running = true; | |
0b81e80c | 2189 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2190 | |
2191 | /* task_work already pending, we're done */ | |
6294f368 | 2192 | if (running) |
e09ee510 | 2193 | return; |
7cbf1722 | 2194 | |
c15b79de PB |
2195 | /* |
2196 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2197 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2198 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2199 | * will do the job. | |
2200 | */ | |
2201 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2202 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2203 | wake_up_process(tsk); | |
e09ee510 | 2204 | return; |
c15b79de | 2205 | } |
2215bed9 | 2206 | |
0b81e80c | 2207 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2208 | tctx->task_running = false; |
e09ee510 PB |
2209 | node = tctx->task_list.first; |
2210 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2211 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2212 | |
e09ee510 PB |
2213 | while (node) { |
2214 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2215 | node = node->next; | |
2216 | if (llist_add(&req->io_task_work.fallback_node, | |
2217 | &req->ctx->fallback_llist)) | |
2218 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2219 | } | |
eab30c4d PB |
2220 | } |
2221 | ||
f237c30a | 2222 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2223 | { |
87ceb6a6 | 2224 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2225 | |
b18a1a45 | 2226 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2227 | io_tw_lock(ctx, locked); |
2593553a | 2228 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2229 | } |
2230 | ||
f237c30a | 2231 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2232 | { |
2233 | struct io_ring_ctx *ctx = req->ctx; | |
2234 | ||
f237c30a | 2235 | io_tw_lock(ctx, locked); |
316319e8 | 2236 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2237 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2238 | __io_queue_sqe(req); |
81b6d05c | 2239 | else |
2593553a | 2240 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2241 | } |
2242 | ||
2c4b8eb6 | 2243 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2244 | { |
2c4b8eb6 | 2245 | req->result = ret; |
5b0a6acc | 2246 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2247 | io_req_task_work_add(req); |
c40f6379 JA |
2248 | } |
2249 | ||
2c4b8eb6 | 2250 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2251 | { |
5b0a6acc | 2252 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2253 | io_req_task_work_add(req); |
a3df7698 PB |
2254 | } |
2255 | ||
773af691 JA |
2256 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2257 | { | |
2258 | req->io_task_work.func = io_queue_async_work; | |
2259 | io_req_task_work_add(req); | |
2260 | } | |
2261 | ||
f2f87370 | 2262 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2263 | { |
9b5f7bd9 | 2264 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2265 | |
2266 | if (nxt) | |
906a8c3f | 2267 | io_req_task_queue(nxt); |
c69f8dbe JL |
2268 | } |
2269 | ||
c3524383 | 2270 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2271 | { |
c3524383 PB |
2272 | io_queue_next(req); |
2273 | __io_free_req(req); | |
2274 | } | |
8766dd51 | 2275 | |
f237c30a PB |
2276 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2277 | { | |
2278 | io_free_req(req); | |
2279 | } | |
2280 | ||
2d6500d4 | 2281 | struct req_batch { |
5af1d13e PB |
2282 | struct task_struct *task; |
2283 | int task_refs; | |
1b4c351f | 2284 | int ctx_refs; |
2d6500d4 PB |
2285 | }; |
2286 | ||
5af1d13e PB |
2287 | static inline void io_init_req_batch(struct req_batch *rb) |
2288 | { | |
5af1d13e | 2289 | rb->task_refs = 0; |
9ae72463 | 2290 | rb->ctx_refs = 0; |
5af1d13e PB |
2291 | rb->task = NULL; |
2292 | } | |
2293 | ||
2d6500d4 PB |
2294 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2295 | struct req_batch *rb) | |
2296 | { | |
9ae72463 PB |
2297 | if (rb->ctx_refs) |
2298 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
e98e49b2 | 2299 | if (rb->task) |
e9dbe221 | 2300 | io_put_task(rb->task, rb->task_refs); |
2d6500d4 PB |
2301 | } |
2302 | ||
6ff119a6 PB |
2303 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2304 | struct io_submit_state *state) | |
2d6500d4 | 2305 | { |
f2f87370 | 2306 | io_queue_next(req); |
96670657 | 2307 | io_dismantle_req(req); |
2d6500d4 | 2308 | |
e3bc8e9d | 2309 | if (req->task != rb->task) { |
7c660731 PB |
2310 | if (rb->task) |
2311 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2312 | rb->task = req->task; |
2313 | rb->task_refs = 0; | |
5af1d13e | 2314 | } |
e3bc8e9d | 2315 | rb->task_refs++; |
9ae72463 | 2316 | rb->ctx_refs++; |
5af1d13e | 2317 | |
bd759045 | 2318 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2319 | state->reqs[state->free_reqs++] = req; |
bd759045 | 2320 | else |
cd0ca2e0 | 2321 | list_add(&req->inflight_entry, &state->free_list); |
7a743e22 PB |
2322 | } |
2323 | ||
2a2758f2 | 2324 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2325 | __must_hold(&ctx->uring_lock) |
905c172f | 2326 | { |
cd0ca2e0 PB |
2327 | struct io_submit_state *state = &ctx->submit_state; |
2328 | int i, nr = state->compl_nr; | |
905c172f PB |
2329 | struct req_batch rb; |
2330 | ||
79ebeaee | 2331 | spin_lock(&ctx->completion_lock); |
905c172f | 2332 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2333 | struct io_kiocb *req = state->compl_reqs[i]; |
5182ed2e | 2334 | |
d4d19c19 PB |
2335 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2336 | req->compl.cflags); | |
905c172f PB |
2337 | } |
2338 | io_commit_cqring(ctx); | |
79ebeaee | 2339 | spin_unlock(&ctx->completion_lock); |
905c172f | 2340 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2341 | |
2342 | io_init_req_batch(&rb); | |
905c172f | 2343 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2344 | struct io_kiocb *req = state->compl_reqs[i]; |
905c172f | 2345 | |
91c2f697 | 2346 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2347 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2348 | } |
2349 | ||
2350 | io_req_free_batch_finish(ctx, &rb); | |
cd0ca2e0 | 2351 | state->compl_nr = 0; |
7a743e22 PB |
2352 | } |
2353 | ||
ba816ad6 JA |
2354 | /* |
2355 | * Drop reference to request, return next in chain (if there is one) if this | |
2356 | * was the last reference to this request. | |
2357 | */ | |
0d85035a | 2358 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2359 | { |
9b5f7bd9 PB |
2360 | struct io_kiocb *nxt = NULL; |
2361 | ||
de9b4cca | 2362 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2363 | nxt = io_req_find_next(req); |
4d7dd462 | 2364 | __io_free_req(req); |
2a44f467 | 2365 | } |
9b5f7bd9 | 2366 | return nxt; |
2b188cc1 JA |
2367 | } |
2368 | ||
0d85035a | 2369 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2370 | { |
de9b4cca | 2371 | if (req_ref_put_and_test(req)) |
e65ef56d | 2372 | io_free_req(req); |
2b188cc1 JA |
2373 | } |
2374 | ||
91c2f697 | 2375 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2376 | { |
91c2f697 | 2377 | if (req_ref_put_and_test(req)) { |
f237c30a | 2378 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2379 | io_req_task_work_add(req); |
2380 | } | |
216578e5 PB |
2381 | } |
2382 | ||
6c503150 | 2383 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2384 | { |
2385 | /* See comment at the top of this file */ | |
2386 | smp_rmb(); | |
e23de15f | 2387 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2388 | } |
2389 | ||
fb5ccc98 PB |
2390 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2391 | { | |
2392 | struct io_rings *rings = ctx->rings; | |
2393 | ||
2394 | /* make sure SQ entry isn't read before tail */ | |
2395 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2396 | } | |
2397 | ||
8ff069bf | 2398 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2399 | { |
8ff069bf | 2400 | unsigned int cflags; |
e94f141b | 2401 | |
bcda7baa JA |
2402 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2403 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2404 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2405 | kfree(kbuf); |
2406 | return cflags; | |
e94f141b JA |
2407 | } |
2408 | ||
8ff069bf | 2409 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2410 | { |
4d954c25 | 2411 | struct io_buffer *kbuf; |
bcda7baa | 2412 | |
ae421d93 PB |
2413 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2414 | return 0; | |
4d954c25 | 2415 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2416 | return io_put_kbuf(req, kbuf); |
2417 | } | |
2418 | ||
4c6e277c JA |
2419 | static inline bool io_run_task_work(void) |
2420 | { | |
ef98eb04 | 2421 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2422 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2423 | tracehook_notify_signal(); |
4c6e277c JA |
2424 | return true; |
2425 | } | |
2426 | ||
2427 | return false; | |
bcda7baa JA |
2428 | } |
2429 | ||
def596e9 JA |
2430 | /* |
2431 | * Find and free completed poll iocbs | |
2432 | */ | |
2433 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
a8576af9 | 2434 | struct list_head *done) |
def596e9 | 2435 | { |
8237e045 | 2436 | struct req_batch rb; |
def596e9 | 2437 | struct io_kiocb *req; |
bbde017a XW |
2438 | |
2439 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2440 | smp_rmb(); | |
def596e9 | 2441 | |
5af1d13e | 2442 | io_init_req_batch(&rb); |
def596e9 | 2443 | while (!list_empty(done)) { |
d21ffe7e | 2444 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2445 | list_del(&req->inflight_entry); |
2446 | ||
a8576af9 | 2447 | if (READ_ONCE(req->result) == -EAGAIN && |
8c130827 | 2448 | !(req->flags & REQ_F_DONT_REISSUE)) { |
bbde017a | 2449 | req->iopoll_completed = 0; |
773af691 | 2450 | io_req_task_queue_reissue(req); |
8c130827 | 2451 | continue; |
bbde017a | 2452 | } |
def596e9 | 2453 | |
ae421d93 PB |
2454 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2455 | io_put_rw_kbuf(req)); | |
def596e9 JA |
2456 | (*nr_events)++; |
2457 | ||
de9b4cca | 2458 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2459 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2460 | } |
def596e9 | 2461 | |
09bb8394 | 2462 | io_commit_cqring(ctx); |
80c18e4a | 2463 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2464 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2465 | } |
2466 | ||
def596e9 | 2467 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
a8576af9 | 2468 | long min) |
def596e9 JA |
2469 | { |
2470 | struct io_kiocb *req, *tmp; | |
2471 | LIST_HEAD(done); | |
2472 | bool spin; | |
def596e9 JA |
2473 | |
2474 | /* | |
2475 | * Only spin for completions if we don't have multiple devices hanging | |
2476 | * off our complete list, and we're under the requested amount. | |
2477 | */ | |
915b3dde | 2478 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 | 2479 | |
d21ffe7e | 2480 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2481 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2482 | int ret; |
def596e9 JA |
2483 | |
2484 | /* | |
581f9810 BM |
2485 | * Move completed and retryable entries to our local lists. |
2486 | * If we find a request that requires polling, break out | |
2487 | * and complete those lists first, if we have entries there. | |
def596e9 | 2488 | */ |
65a6543d | 2489 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2490 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2491 | continue; |
2492 | } | |
2493 | if (!list_empty(&done)) | |
2494 | break; | |
2495 | ||
2496 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
a2416e1e PB |
2497 | if (unlikely(ret < 0)) |
2498 | return ret; | |
2499 | else if (ret) | |
2500 | spin = false; | |
def596e9 | 2501 | |
3aadc23e PB |
2502 | /* iopoll may have completed current req */ |
2503 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2504 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2505 | } |
2506 | ||
2507 | if (!list_empty(&done)) | |
a8576af9 | 2508 | io_iopoll_complete(ctx, nr_events, &done); |
def596e9 | 2509 | |
a2416e1e | 2510 | return 0; |
def596e9 JA |
2511 | } |
2512 | ||
def596e9 JA |
2513 | /* |
2514 | * We can't just wait for polled events to come to us, we have to actively | |
2515 | * find and complete them. | |
2516 | */ | |
b2edc0a7 | 2517 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2518 | { |
2519 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2520 | return; | |
2521 | ||
2522 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2523 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2524 | unsigned int nr_events = 0; |
2525 | ||
a8576af9 | 2526 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2527 | |
b2edc0a7 PB |
2528 | /* let it sleep and repeat later if can't complete a request */ |
2529 | if (nr_events == 0) | |
2530 | break; | |
08f5439f JA |
2531 | /* |
2532 | * Ensure we allow local-to-the-cpu processing to take place, | |
2533 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2534 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2535 | */ |
3fcee5a6 PB |
2536 | if (need_resched()) { |
2537 | mutex_unlock(&ctx->uring_lock); | |
2538 | cond_resched(); | |
2539 | mutex_lock(&ctx->uring_lock); | |
2540 | } | |
def596e9 JA |
2541 | } |
2542 | mutex_unlock(&ctx->uring_lock); | |
2543 | } | |
2544 | ||
7668b92a | 2545 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2546 | { |
7668b92a | 2547 | unsigned int nr_events = 0; |
e9979b36 | 2548 | int ret = 0; |
500f9fba | 2549 | |
c7849be9 XW |
2550 | /* |
2551 | * We disallow the app entering submit/complete with polling, but we | |
2552 | * still need to lock the ring to prevent racing with polled issue | |
2553 | * that got punted to a workqueue. | |
2554 | */ | |
2555 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2556 | /* |
2557 | * Don't enter poll loop if we already have events pending. | |
2558 | * If we do, we can potentially be spinning for commands that | |
2559 | * already triggered a CQE (eg in error). | |
2560 | */ | |
5ed7a37d | 2561 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2562 | __io_cqring_overflow_flush(ctx, false); |
2563 | if (io_cqring_events(ctx)) | |
2564 | goto out; | |
def596e9 | 2565 | do { |
500f9fba JA |
2566 | /* |
2567 | * If a submit got punted to a workqueue, we can have the | |
2568 | * application entering polling for a command before it gets | |
2569 | * issued. That app will hold the uring_lock for the duration | |
2570 | * of the poll right here, so we need to take a breather every | |
2571 | * now and then to ensure that the issue has a chance to add | |
2572 | * the poll to the issued list. Otherwise we can spin here | |
2573 | * forever, while the workqueue is stuck trying to acquire the | |
2574 | * very same mutex. | |
2575 | */ | |
e9979b36 | 2576 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2577 | u32 tail = ctx->cached_cq_tail; |
2578 | ||
500f9fba | 2579 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2580 | io_run_task_work(); |
500f9fba | 2581 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2582 | |
8f487ef2 PB |
2583 | /* some requests don't go through iopoll_list */ |
2584 | if (tail != ctx->cached_cq_tail || | |
2585 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2586 | break; |
500f9fba | 2587 | } |
a8576af9 | 2588 | ret = io_do_iopoll(ctx, &nr_events, min); |
f39c8a5b PB |
2589 | } while (!ret && nr_events < min && !need_resched()); |
2590 | out: | |
500f9fba | 2591 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2592 | return ret; |
2593 | } | |
2594 | ||
491381ce | 2595 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2596 | { |
491381ce JA |
2597 | /* |
2598 | * Tell lockdep we inherited freeze protection from submission | |
2599 | * thread. | |
2600 | */ | |
2601 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2602 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2603 | |
1c98679d PB |
2604 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2605 | sb_end_write(sb); | |
2b188cc1 JA |
2606 | } |
2607 | } | |
2608 | ||
b63534c4 | 2609 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2610 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2611 | { |
ab454438 | 2612 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2613 | |
ab454438 PB |
2614 | if (!rw) |
2615 | return !io_req_prep_async(req); | |
2616 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2617 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2618 | return true; | |
b63534c4 | 2619 | } |
b63534c4 | 2620 | |
3e6a0d3c | 2621 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2622 | { |
355afaeb | 2623 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2624 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2625 | |
355afaeb JA |
2626 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2627 | return false; | |
3e6a0d3c JA |
2628 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2629 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2630 | return false; |
7c977a58 JA |
2631 | /* |
2632 | * If ref is dying, we might be running poll reap from the exit work. | |
2633 | * Don't attempt to reissue from that path, just let it fail with | |
2634 | * -EAGAIN. | |
2635 | */ | |
3e6a0d3c JA |
2636 | if (percpu_ref_is_dying(&ctx->refs)) |
2637 | return false; | |
ef046888 JA |
2638 | /* |
2639 | * Play it safe and assume not safe to re-import and reissue if we're | |
2640 | * not in the original thread group (or in task context). | |
2641 | */ | |
2642 | if (!same_thread_group(req->task, current) || !in_task()) | |
2643 | return false; | |
3e6a0d3c JA |
2644 | return true; |
2645 | } | |
e82ad485 | 2646 | #else |
a1ff1e3f | 2647 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2648 | { |
2649 | return false; | |
2650 | } | |
e82ad485 | 2651 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2652 | { |
b63534c4 JA |
2653 | return false; |
2654 | } | |
3e6a0d3c | 2655 | #endif |
b63534c4 | 2656 | |
8ef12efe | 2657 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2658 | { |
b65c128f PB |
2659 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2660 | kiocb_end_write(req); | |
9532b99b PB |
2661 | if (res != req->result) { |
2662 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2663 | io_rw_should_reissue(req)) { | |
2664 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2665 | return true; |
9532b99b | 2666 | } |
93d2bcd2 | 2667 | req_set_fail(req); |
8ef12efe | 2668 | req->result = res; |
9532b99b | 2669 | } |
8ef12efe JA |
2670 | return false; |
2671 | } | |
2672 | ||
f237c30a | 2673 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2674 | { |
126180b9 PB |
2675 | unsigned int cflags = io_put_rw_kbuf(req); |
2676 | long res = req->result; | |
2677 | ||
2678 | if (*locked) { | |
2679 | struct io_ring_ctx *ctx = req->ctx; | |
2680 | struct io_submit_state *state = &ctx->submit_state; | |
2681 | ||
2682 | io_req_complete_state(req, res, cflags); | |
2683 | state->compl_reqs[state->compl_nr++] = req; | |
2684 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2685 | io_submit_flush_completions(ctx); | |
2686 | } else { | |
2687 | io_req_complete_post(req, res, cflags); | |
2688 | } | |
8ef12efe JA |
2689 | } |
2690 | ||
2691 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2692 | unsigned int issue_flags) | |
2693 | { | |
2694 | if (__io_complete_rw_common(req, res)) | |
2695 | return; | |
63637853 | 2696 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2697 | } |
2698 | ||
2699 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2700 | { | |
9adbd45d | 2701 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2702 | |
8ef12efe JA |
2703 | if (__io_complete_rw_common(req, res)) |
2704 | return; | |
2705 | req->result = res; | |
2706 | req->io_task_work.func = io_req_task_complete; | |
2707 | io_req_task_work_add(req); | |
2b188cc1 JA |
2708 | } |
2709 | ||
def596e9 JA |
2710 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2711 | { | |
9adbd45d | 2712 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2713 | |
491381ce JA |
2714 | if (kiocb->ki_flags & IOCB_WRITE) |
2715 | kiocb_end_write(req); | |
9532b99b | 2716 | if (unlikely(res != req->result)) { |
a1ff1e3f JA |
2717 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
2718 | io_resubmit_prep(req))) { | |
93d2bcd2 | 2719 | req_set_fail(req); |
9532b99b PB |
2720 | req->flags |= REQ_F_DONT_REISSUE; |
2721 | } | |
8c130827 | 2722 | } |
bbde017a XW |
2723 | |
2724 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2725 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2726 | smp_wmb(); |
2727 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2728 | } |
2729 | ||
2730 | /* | |
2731 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2732 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2733 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2734 | * accessing the kiocb cookie. |
2735 | */ | |
cb3d8972 | 2736 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2737 | { |
2738 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2739 | const bool in_async = io_wq_current_is_worker(); |
2740 | ||
2741 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2742 | if (unlikely(in_async)) | |
2743 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2744 | |
2745 | /* | |
2746 | * Track whether we have multiple files in our lists. This will impact | |
2747 | * how we do polling eventually, not spinning if we're on potentially | |
2748 | * different devices. | |
2749 | */ | |
540e32a0 | 2750 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2751 | ctx->poll_multi_queue = false; |
2752 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2753 | struct io_kiocb *list_req; |
915b3dde | 2754 | unsigned int queue_num0, queue_num1; |
def596e9 | 2755 | |
540e32a0 | 2756 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2757 | inflight_entry); |
915b3dde HX |
2758 | |
2759 | if (list_req->file != req->file) { | |
2760 | ctx->poll_multi_queue = true; | |
2761 | } else { | |
2762 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2763 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2764 | if (queue_num0 != queue_num1) | |
2765 | ctx->poll_multi_queue = true; | |
2766 | } | |
def596e9 JA |
2767 | } |
2768 | ||
2769 | /* | |
2770 | * For fast devices, IO may have already completed. If it has, add | |
2771 | * it to the front so we find it first. | |
2772 | */ | |
65a6543d | 2773 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2774 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2775 | else |
d21ffe7e | 2776 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2777 | |
cb3d8972 PB |
2778 | if (unlikely(in_async)) { |
2779 | /* | |
2780 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2781 | * in sq thread task context or in io worker task context. If | |
2782 | * current task context is sq thread, we don't need to check | |
2783 | * whether should wake up sq thread. | |
2784 | */ | |
2785 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2786 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2787 | wake_up(&ctx->sq_data->wait); | |
2788 | ||
2789 | mutex_unlock(&ctx->uring_lock); | |
2790 | } | |
def596e9 JA |
2791 | } |
2792 | ||
4503b767 JA |
2793 | static bool io_bdev_nowait(struct block_device *bdev) |
2794 | { | |
9ba0d0c8 | 2795 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2796 | } |
2797 | ||
2b188cc1 JA |
2798 | /* |
2799 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2800 | * any file. For now, just ensure that anything potentially problematic is done | |
2801 | * inline. | |
2802 | */ | |
b191e2df | 2803 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2804 | { |
2805 | umode_t mode = file_inode(file)->i_mode; | |
2806 | ||
4503b767 | 2807 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2808 | if (IS_ENABLED(CONFIG_BLOCK) && |
2809 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2810 | return true; |
2811 | return false; | |
2812 | } | |
976517f1 | 2813 | if (S_ISSOCK(mode)) |
2b188cc1 | 2814 | return true; |
4503b767 | 2815 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2816 | if (IS_ENABLED(CONFIG_BLOCK) && |
2817 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2818 | file->f_op != &io_uring_fops) |
2819 | return true; | |
2820 | return false; | |
2821 | } | |
2b188cc1 | 2822 | |
c5b85625 JA |
2823 | /* any ->read/write should understand O_NONBLOCK */ |
2824 | if (file->f_flags & O_NONBLOCK) | |
2825 | return true; | |
2826 | ||
af197f50 JA |
2827 | if (!(file->f_mode & FMODE_NOWAIT)) |
2828 | return false; | |
2829 | ||
2830 | if (rw == READ) | |
2831 | return file->f_op->read_iter != NULL; | |
2832 | ||
2833 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2834 | } |
2835 | ||
b191e2df | 2836 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2837 | { |
b191e2df | 2838 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2839 | return true; |
b191e2df | 2840 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2841 | return true; |
2842 | ||
b191e2df | 2843 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2844 | } |
2845 | ||
a88fc400 | 2846 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2847 | { |
def596e9 | 2848 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2849 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2850 | struct file *file = req->file; |
09bb8394 JA |
2851 | unsigned ioprio; |
2852 | int ret; | |
2b188cc1 | 2853 | |
c97d8a0f | 2854 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2855 | req->flags |= REQ_F_ISREG; |
2856 | ||
2b188cc1 | 2857 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2858 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2859 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2860 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2861 | } |
2b188cc1 | 2862 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2863 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2864 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2865 | if (unlikely(ret)) | |
2866 | return ret; | |
2b188cc1 | 2867 | |
75c668cd PB |
2868 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2869 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2870 | req->flags |= REQ_F_NOWAIT; | |
2871 | ||
2b188cc1 JA |
2872 | ioprio = READ_ONCE(sqe->ioprio); |
2873 | if (ioprio) { | |
2874 | ret = ioprio_check_cap(ioprio); | |
2875 | if (ret) | |
09bb8394 | 2876 | return ret; |
2b188cc1 JA |
2877 | |
2878 | kiocb->ki_ioprio = ioprio; | |
2879 | } else | |
2880 | kiocb->ki_ioprio = get_current_ioprio(); | |
2881 | ||
def596e9 | 2882 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2883 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2884 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2885 | return -EOPNOTSUPP; |
2b188cc1 | 2886 | |
394918eb | 2887 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2888 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2889 | req->iopoll_completed = 0; |
def596e9 | 2890 | } else { |
09bb8394 JA |
2891 | if (kiocb->ki_flags & IOCB_HIPRI) |
2892 | return -EINVAL; | |
def596e9 JA |
2893 | kiocb->ki_complete = io_complete_rw; |
2894 | } | |
9adbd45d | 2895 | |
eae071c9 PB |
2896 | if (req->opcode == IORING_OP_READ_FIXED || |
2897 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2898 | req->imu = NULL; | |
2899 | io_req_set_rsrc_node(req); | |
2900 | } | |
2901 | ||
3529d8c2 JA |
2902 | req->rw.addr = READ_ONCE(sqe->addr); |
2903 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2904 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2905 | return 0; |
2b188cc1 JA |
2906 | } |
2907 | ||
2908 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2909 | { | |
2910 | switch (ret) { | |
2911 | case -EIOCBQUEUED: | |
2912 | break; | |
2913 | case -ERESTARTSYS: | |
2914 | case -ERESTARTNOINTR: | |
2915 | case -ERESTARTNOHAND: | |
2916 | case -ERESTART_RESTARTBLOCK: | |
2917 | /* | |
2918 | * We can't just restart the syscall, since previously | |
2919 | * submitted sqes may already be in progress. Just fail this | |
2920 | * IO with EINTR. | |
2921 | */ | |
2922 | ret = -EINTR; | |
df561f66 | 2923 | fallthrough; |
2b188cc1 JA |
2924 | default: |
2925 | kiocb->ki_complete(kiocb, ret, 0); | |
2926 | } | |
2927 | } | |
2928 | ||
a1d7c393 | 2929 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2930 | unsigned int issue_flags) |
ba816ad6 | 2931 | { |
ba04291e | 2932 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2933 | struct io_async_rw *io = req->async_data; |
97284637 | 2934 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2935 | |
227c0c96 | 2936 | /* add previously done IO, if any */ |
e8c2bc1f | 2937 | if (io && io->bytes_done > 0) { |
227c0c96 | 2938 | if (ret < 0) |
e8c2bc1f | 2939 | ret = io->bytes_done; |
227c0c96 | 2940 | else |
e8c2bc1f | 2941 | ret += io->bytes_done; |
227c0c96 JA |
2942 | } |
2943 | ||
ba04291e JA |
2944 | if (req->flags & REQ_F_CUR_POS) |
2945 | req->file->f_pos = kiocb->ki_pos; | |
e149bd74 | 2946 | if (ret >= 0 && check_reissue) |
889fca73 | 2947 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2948 | else |
2949 | io_rw_done(kiocb, ret); | |
97284637 | 2950 | |
fe7e3257 | 2951 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
97284637 | 2952 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2953 | if (io_resubmit_prep(req)) { |
773af691 | 2954 | io_req_task_queue_reissue(req); |
8c130827 | 2955 | } else { |
93d2bcd2 | 2956 | req_set_fail(req); |
ae421d93 PB |
2957 | __io_req_complete(req, issue_flags, ret, |
2958 | io_put_rw_kbuf(req)); | |
97284637 PB |
2959 | } |
2960 | } | |
ba816ad6 JA |
2961 | } |
2962 | ||
eae071c9 PB |
2963 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2964 | struct io_mapped_ubuf *imu) | |
edafccee | 2965 | { |
9adbd45d | 2966 | size_t len = req->rw.len; |
75769e3f | 2967 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2968 | size_t offset; |
edafccee | 2969 | |
75769e3f | 2970 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2971 | return -EFAULT; |
2972 | /* not inside the mapped region */ | |
4751f53d | 2973 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2974 | return -EFAULT; |
2975 | ||
2976 | /* | |
2977 | * May not be a start of buffer, set size appropriately | |
2978 | * and advance us to the beginning. | |
2979 | */ | |
2980 | offset = buf_addr - imu->ubuf; | |
2981 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2982 | |
2983 | if (offset) { | |
2984 | /* | |
2985 | * Don't use iov_iter_advance() here, as it's really slow for | |
2986 | * using the latter parts of a big fixed buffer - it iterates | |
2987 | * over each segment manually. We can cheat a bit here, because | |
2988 | * we know that: | |
2989 | * | |
2990 | * 1) it's a BVEC iter, we set it up | |
2991 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2992 | * first and last bvec | |
2993 | * | |
2994 | * So just find our index, and adjust the iterator afterwards. | |
2995 | * If the offset is within the first bvec (or the whole first | |
2996 | * bvec, just use iov_iter_advance(). This makes it easier | |
2997 | * since we can just skip the first segment, which may not | |
2998 | * be PAGE_SIZE aligned. | |
2999 | */ | |
3000 | const struct bio_vec *bvec = imu->bvec; | |
3001 | ||
3002 | if (offset <= bvec->bv_len) { | |
3003 | iov_iter_advance(iter, offset); | |
3004 | } else { | |
3005 | unsigned long seg_skip; | |
3006 | ||
3007 | /* skip first vec */ | |
3008 | offset -= bvec->bv_len; | |
3009 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3010 | ||
3011 | iter->bvec = bvec + seg_skip; | |
3012 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3013 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3014 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3015 | } |
3016 | } | |
3017 | ||
847595de | 3018 | return 0; |
edafccee JA |
3019 | } |
3020 | ||
eae071c9 PB |
3021 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
3022 | { | |
3023 | struct io_ring_ctx *ctx = req->ctx; | |
3024 | struct io_mapped_ubuf *imu = req->imu; | |
3025 | u16 index, buf_index = req->buf_index; | |
3026 | ||
3027 | if (likely(!imu)) { | |
3028 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
3029 | return -EFAULT; | |
3030 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
3031 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3032 | req->imu = imu; | |
3033 | } | |
3034 | return __io_import_fixed(req, rw, iter, imu); | |
3035 | } | |
3036 | ||
bcda7baa JA |
3037 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3038 | { | |
3039 | if (needs_lock) | |
3040 | mutex_unlock(&ctx->uring_lock); | |
3041 | } | |
3042 | ||
3043 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3044 | { | |
3045 | /* | |
3046 | * "Normal" inline submissions always hold the uring_lock, since we | |
3047 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3048 | * The only exception is when we've detached the request and issue it | |
3049 | * from an async worker thread, grab the lock for that case. | |
3050 | */ | |
3051 | if (needs_lock) | |
3052 | mutex_lock(&ctx->uring_lock); | |
3053 | } | |
3054 | ||
3055 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3056 | int bgid, struct io_buffer *kbuf, | |
3057 | bool needs_lock) | |
3058 | { | |
3059 | struct io_buffer *head; | |
3060 | ||
3061 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3062 | return kbuf; | |
3063 | ||
3064 | io_ring_submit_lock(req->ctx, needs_lock); | |
3065 | ||
3066 | lockdep_assert_held(&req->ctx->uring_lock); | |
3067 | ||
9e15c3a0 | 3068 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3069 | if (head) { |
3070 | if (!list_empty(&head->list)) { | |
3071 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3072 | list); | |
3073 | list_del(&kbuf->list); | |
3074 | } else { | |
3075 | kbuf = head; | |
9e15c3a0 | 3076 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3077 | } |
3078 | if (*len > kbuf->len) | |
3079 | *len = kbuf->len; | |
3080 | } else { | |
3081 | kbuf = ERR_PTR(-ENOBUFS); | |
3082 | } | |
3083 | ||
3084 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3085 | ||
3086 | return kbuf; | |
3087 | } | |
3088 | ||
4d954c25 JA |
3089 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3090 | bool needs_lock) | |
3091 | { | |
3092 | struct io_buffer *kbuf; | |
4f4eeba8 | 3093 | u16 bgid; |
4d954c25 JA |
3094 | |
3095 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3096 | bgid = req->buf_index; |
4d954c25 JA |
3097 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3098 | if (IS_ERR(kbuf)) | |
3099 | return kbuf; | |
3100 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3101 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3102 | return u64_to_user_ptr(kbuf->addr); | |
3103 | } | |
3104 | ||
3105 | #ifdef CONFIG_COMPAT | |
3106 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3107 | bool needs_lock) | |
3108 | { | |
3109 | struct compat_iovec __user *uiov; | |
3110 | compat_ssize_t clen; | |
3111 | void __user *buf; | |
3112 | ssize_t len; | |
3113 | ||
3114 | uiov = u64_to_user_ptr(req->rw.addr); | |
3115 | if (!access_ok(uiov, sizeof(*uiov))) | |
3116 | return -EFAULT; | |
3117 | if (__get_user(clen, &uiov->iov_len)) | |
3118 | return -EFAULT; | |
3119 | if (clen < 0) | |
3120 | return -EINVAL; | |
3121 | ||
3122 | len = clen; | |
3123 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3124 | if (IS_ERR(buf)) | |
3125 | return PTR_ERR(buf); | |
3126 | iov[0].iov_base = buf; | |
3127 | iov[0].iov_len = (compat_size_t) len; | |
3128 | return 0; | |
3129 | } | |
3130 | #endif | |
3131 | ||
3132 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3133 | bool needs_lock) | |
3134 | { | |
3135 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3136 | void __user *buf; | |
3137 | ssize_t len; | |
3138 | ||
3139 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3140 | return -EFAULT; | |
3141 | ||
3142 | len = iov[0].iov_len; | |
3143 | if (len < 0) | |
3144 | return -EINVAL; | |
3145 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3146 | if (IS_ERR(buf)) | |
3147 | return PTR_ERR(buf); | |
3148 | iov[0].iov_base = buf; | |
3149 | iov[0].iov_len = len; | |
3150 | return 0; | |
3151 | } | |
3152 | ||
3153 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3154 | bool needs_lock) | |
3155 | { | |
dddb3e26 JA |
3156 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3157 | struct io_buffer *kbuf; | |
3158 | ||
3159 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3160 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3161 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3162 | return 0; |
dddb3e26 | 3163 | } |
dd201662 | 3164 | if (req->rw.len != 1) |
4d954c25 JA |
3165 | return -EINVAL; |
3166 | ||
3167 | #ifdef CONFIG_COMPAT | |
3168 | if (req->ctx->compat) | |
3169 | return io_compat_import(req, iov, needs_lock); | |
3170 | #endif | |
3171 | ||
3172 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3173 | } | |
3174 | ||
847595de PB |
3175 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3176 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3177 | { |
9adbd45d JA |
3178 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3179 | size_t sqe_len = req->rw.len; | |
847595de | 3180 | u8 opcode = req->opcode; |
4d954c25 | 3181 | ssize_t ret; |
edafccee | 3182 | |
7d009165 | 3183 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3184 | *iovec = NULL; |
9adbd45d | 3185 | return io_import_fixed(req, rw, iter); |
edafccee | 3186 | } |
2b188cc1 | 3187 | |
bcda7baa | 3188 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3189 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3190 | return -EINVAL; |
3191 | ||
3a6820f2 | 3192 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3193 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3194 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3195 | if (IS_ERR(buf)) |
4d954c25 | 3196 | return PTR_ERR(buf); |
3f9d6441 | 3197 | req->rw.len = sqe_len; |
bcda7baa JA |
3198 | } |
3199 | ||
3a6820f2 JA |
3200 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3201 | *iovec = NULL; | |
10fc72e4 | 3202 | return ret; |
3a6820f2 JA |
3203 | } |
3204 | ||
4d954c25 JA |
3205 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3206 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3207 | if (!ret) |
3208 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3209 | *iovec = NULL; |
3210 | return ret; | |
3211 | } | |
3212 | ||
89cd35c5 CH |
3213 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3214 | req->ctx->compat); | |
2b188cc1 JA |
3215 | } |
3216 | ||
0fef9483 JA |
3217 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3218 | { | |
5b09e37e | 3219 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3220 | } |
3221 | ||
31b51510 | 3222 | /* |
32960613 JA |
3223 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3224 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3225 | */ |
4017eb91 | 3226 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3227 | { |
4017eb91 JA |
3228 | struct kiocb *kiocb = &req->rw.kiocb; |
3229 | struct file *file = req->file; | |
32960613 JA |
3230 | ssize_t ret = 0; |
3231 | ||
3232 | /* | |
3233 | * Don't support polled IO through this interface, and we can't | |
3234 | * support non-blocking either. For the latter, this just causes | |
3235 | * the kiocb to be handled from an async context. | |
3236 | */ | |
3237 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3238 | return -EOPNOTSUPP; | |
3239 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3240 | return -EAGAIN; | |
3241 | ||
3242 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3243 | struct iovec iovec; |
32960613 JA |
3244 | ssize_t nr; |
3245 | ||
311ae9e1 PB |
3246 | if (!iov_iter_is_bvec(iter)) { |
3247 | iovec = iov_iter_iovec(iter); | |
3248 | } else { | |
4017eb91 JA |
3249 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3250 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3251 | } |
3252 | ||
32960613 JA |
3253 | if (rw == READ) { |
3254 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3255 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3256 | } else { |
3257 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3258 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3259 | } |
3260 | ||
3261 | if (nr < 0) { | |
3262 | if (!ret) | |
3263 | ret = nr; | |
3264 | break; | |
3265 | } | |
16c8d2df JA |
3266 | if (!iov_iter_is_bvec(iter)) { |
3267 | iov_iter_advance(iter, nr); | |
3268 | } else { | |
3269 | req->rw.len -= nr; | |
3270 | req->rw.addr += nr; | |
3271 | } | |
32960613 JA |
3272 | ret += nr; |
3273 | if (nr != iovec.iov_len) | |
3274 | break; | |
32960613 JA |
3275 | } |
3276 | ||
3277 | return ret; | |
3278 | } | |
3279 | ||
ff6165b2 JA |
3280 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3281 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3282 | { |
e8c2bc1f | 3283 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3284 | |
ff6165b2 | 3285 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3286 | rw->free_iovec = iovec; |
227c0c96 | 3287 | rw->bytes_done = 0; |
ff6165b2 | 3288 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3289 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3290 | return; |
b64e3444 | 3291 | if (!iovec) { |
ff6165b2 JA |
3292 | unsigned iov_off = 0; |
3293 | ||
3294 | rw->iter.iov = rw->fast_iov; | |
3295 | if (iter->iov != fast_iov) { | |
3296 | iov_off = iter->iov - fast_iov; | |
3297 | rw->iter.iov += iov_off; | |
3298 | } | |
3299 | if (rw->fast_iov != fast_iov) | |
3300 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3301 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3302 | } else { |
3303 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3304 | } |
3305 | } | |
3306 | ||
6cb78689 | 3307 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3308 | { |
e8c2bc1f JA |
3309 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3310 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3311 | return req->async_data == NULL; | |
3d9932a8 XW |
3312 | } |
3313 | ||
ff6165b2 JA |
3314 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3315 | const struct iovec *fast_iov, | |
227c0c96 | 3316 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3317 | { |
26f0505a | 3318 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3319 | return 0; |
e8c2bc1f | 3320 | if (!req->async_data) { |
6cb78689 | 3321 | if (io_alloc_async_data(req)) { |
6bf985dc | 3322 | kfree(iovec); |
5d204bcf | 3323 | return -ENOMEM; |
6bf985dc | 3324 | } |
b7bb4f7d | 3325 | |
ff6165b2 | 3326 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3327 | } |
b7bb4f7d | 3328 | return 0; |
f67676d1 JA |
3329 | } |
3330 | ||
73debe68 | 3331 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3332 | { |
e8c2bc1f | 3333 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3334 | struct iovec *iov = iorw->fast_iov; |
847595de | 3335 | int ret; |
c3e330a4 | 3336 | |
2846c481 | 3337 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3338 | if (unlikely(ret < 0)) |
3339 | return ret; | |
3340 | ||
ab0b196c PB |
3341 | iorw->bytes_done = 0; |
3342 | iorw->free_iovec = iov; | |
3343 | if (iov) | |
3344 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3345 | return 0; |
3346 | } | |
3347 | ||
73debe68 | 3348 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3349 | { |
3529d8c2 JA |
3350 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3351 | return -EBADF; | |
93642ef8 | 3352 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3353 | } |
3354 | ||
c1dd91d1 JA |
3355 | /* |
3356 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3357 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3358 | * This gets called when the page is unlocked, and we generally expect that to | |
3359 | * happen when the page IO is completed and the page is now uptodate. This will | |
3360 | * queue a task_work based retry of the operation, attempting to copy the data | |
3361 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3362 | * do a thread based blocking retry of the operation. That's the unexpected | |
3363 | * slow path. | |
3364 | */ | |
bcf5a063 JA |
3365 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3366 | int sync, void *arg) | |
3367 | { | |
3368 | struct wait_page_queue *wpq; | |
3369 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3370 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3371 | |
3372 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3373 | ||
cdc8fcb4 LT |
3374 | if (!wake_page_match(wpq, key)) |
3375 | return 0; | |
3376 | ||
c8d317aa | 3377 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3378 | list_del_init(&wait->entry); |
921b9054 | 3379 | io_req_task_queue(req); |
bcf5a063 JA |
3380 | return 1; |
3381 | } | |
3382 | ||
c1dd91d1 JA |
3383 | /* |
3384 | * This controls whether a given IO request should be armed for async page | |
3385 | * based retry. If we return false here, the request is handed to the async | |
3386 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3387 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3388 | * will either succeed because the page is now uptodate and unlocked, or it | |
3389 | * will register a callback when the page is unlocked at IO completion. Through | |
3390 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3391 | * That retry will attempt the buffered read again. The retry will generally | |
3392 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3393 | * async worker threads for a blocking retry. | |
3394 | */ | |
227c0c96 | 3395 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3396 | { |
e8c2bc1f JA |
3397 | struct io_async_rw *rw = req->async_data; |
3398 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3399 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3400 | |
bcf5a063 JA |
3401 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3402 | if (req->flags & REQ_F_NOWAIT) | |
3403 | return false; | |
f67676d1 | 3404 | |
227c0c96 | 3405 | /* Only for buffered IO */ |
3b2a4439 | 3406 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3407 | return false; |
3b2a4439 | 3408 | |
bcf5a063 JA |
3409 | /* |
3410 | * just use poll if we can, and don't attempt if the fs doesn't | |
3411 | * support callback based unlocks | |
3412 | */ | |
3413 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3414 | return false; | |
f67676d1 | 3415 | |
3b2a4439 JA |
3416 | wait->wait.func = io_async_buf_func; |
3417 | wait->wait.private = req; | |
3418 | wait->wait.flags = 0; | |
3419 | INIT_LIST_HEAD(&wait->wait.entry); | |
3420 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3421 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3422 | kiocb->ki_waitq = wait; |
3b2a4439 | 3423 | return true; |
bcf5a063 JA |
3424 | } |
3425 | ||
aeab9506 | 3426 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3427 | { |
3428 | if (req->file->f_op->read_iter) | |
3429 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3430 | else if (req->file->f_op->read) |
4017eb91 | 3431 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3432 | else |
3433 | return -EINVAL; | |
f67676d1 JA |
3434 | } |
3435 | ||
7db30437 ML |
3436 | static bool need_read_all(struct io_kiocb *req) |
3437 | { | |
3438 | return req->flags & REQ_F_ISREG || | |
3439 | S_ISBLK(file_inode(req->file)->i_mode); | |
3440 | } | |
3441 | ||
889fca73 | 3442 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3443 | { |
3444 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3445 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3446 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3447 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3448 | ssize_t io_size, ret, ret2; |
45d189c6 | 3449 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3450 | |
2846c481 | 3451 | if (rw) { |
e8c2bc1f | 3452 | iter = &rw->iter; |
2846c481 PB |
3453 | iovec = NULL; |
3454 | } else { | |
3455 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3456 | if (ret < 0) | |
3457 | return ret; | |
3458 | } | |
632546c4 | 3459 | io_size = iov_iter_count(iter); |
fa15bafb | 3460 | req->result = io_size; |
2b188cc1 | 3461 | |
fd6c2e4c JA |
3462 | /* Ensure we clear previously set non-block flag */ |
3463 | if (!force_nonblock) | |
29de5f6a | 3464 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3465 | else |
3466 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3467 | ||
24c74678 | 3468 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3469 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3470 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3471 | return ret ?: -EAGAIN; |
6713e7a6 | 3472 | } |
9e645e11 | 3473 | |
632546c4 | 3474 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3475 | if (unlikely(ret)) { |
3476 | kfree(iovec); | |
3477 | return ret; | |
3478 | } | |
2b188cc1 | 3479 | |
227c0c96 | 3480 | ret = io_iter_do_read(req, iter); |
32960613 | 3481 | |
230d50d4 | 3482 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3483 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3484 | /* IOPOLL retry should happen for io-wq threads */ |
3485 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3486 | goto done; |
75c668cd PB |
3487 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3488 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3489 | goto done; |
84216315 | 3490 | /* some cases will consume bytes even on error returns */ |
89c2b3b7 | 3491 | iov_iter_reexpand(iter, iter->count + iter->truncated); |
632546c4 | 3492 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3493 | ret = 0; |
230d50d4 JA |
3494 | } else if (ret == -EIOCBQUEUED) { |
3495 | goto out_free; | |
7335e3bf | 3496 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
7db30437 | 3497 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3498 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3499 | goto done; |
227c0c96 JA |
3500 | } |
3501 | ||
227c0c96 | 3502 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3503 | if (ret2) |
3504 | return ret2; | |
3505 | ||
fe1cdd55 | 3506 | iovec = NULL; |
e8c2bc1f | 3507 | rw = req->async_data; |
227c0c96 | 3508 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3509 | iter = &rw->iter; |
227c0c96 | 3510 | |
b23df91b PB |
3511 | do { |
3512 | io_size -= ret; | |
3513 | rw->bytes_done += ret; | |
3514 | /* if we can retry, do so with the callbacks armed */ | |
3515 | if (!io_rw_should_retry(req)) { | |
3516 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3517 | return -EAGAIN; | |
3518 | } | |
3519 | ||
3520 | /* | |
3521 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3522 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3523 | * desired page gets unlocked. We can also get a partial read | |
3524 | * here, and if we do, then just retry at the new offset. | |
3525 | */ | |
3526 | ret = io_iter_do_read(req, iter); | |
3527 | if (ret == -EIOCBQUEUED) | |
3528 | return 0; | |
227c0c96 | 3529 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3530 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3531 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3532 | done: |
889fca73 | 3533 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3534 | out_free: |
3535 | /* it's faster to check here then delegate to kfree */ | |
3536 | if (iovec) | |
3537 | kfree(iovec); | |
5ea5dd45 | 3538 | return 0; |
2b188cc1 JA |
3539 | } |
3540 | ||
73debe68 | 3541 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3542 | { |
3529d8c2 JA |
3543 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3544 | return -EBADF; | |
93642ef8 | 3545 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3546 | } |
3547 | ||
889fca73 | 3548 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3549 | { |
3550 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3551 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3552 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3553 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3554 | ssize_t ret, ret2, io_size; |
45d189c6 | 3555 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3556 | |
2846c481 | 3557 | if (rw) { |
e8c2bc1f | 3558 | iter = &rw->iter; |
2846c481 PB |
3559 | iovec = NULL; |
3560 | } else { | |
3561 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3562 | if (ret < 0) | |
3563 | return ret; | |
3564 | } | |
632546c4 | 3565 | io_size = iov_iter_count(iter); |
fa15bafb | 3566 | req->result = io_size; |
2b188cc1 | 3567 | |
fd6c2e4c JA |
3568 | /* Ensure we clear previously set non-block flag */ |
3569 | if (!force_nonblock) | |
a88fc400 PB |
3570 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3571 | else | |
3572 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3573 | |
24c74678 | 3574 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3575 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3576 | goto copy_iov; |
31b51510 | 3577 | |
10d59345 JA |
3578 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3579 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3580 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3581 | goto copy_iov; |
31b51510 | 3582 | |
632546c4 | 3583 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3584 | if (unlikely(ret)) |
3585 | goto out_free; | |
4ed734b0 | 3586 | |
fa15bafb PB |
3587 | /* |
3588 | * Open-code file_start_write here to grab freeze protection, | |
3589 | * which will be released by another thread in | |
3590 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3591 | * released so that it doesn't complain about the held lock when | |
3592 | * we return to userspace. | |
3593 | */ | |
3594 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3595 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3596 | __sb_writers_release(file_inode(req->file)->i_sb, |
3597 | SB_FREEZE_WRITE); | |
3598 | } | |
3599 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3600 | |
fa15bafb | 3601 | if (req->file->f_op->write_iter) |
ff6165b2 | 3602 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3603 | else if (req->file->f_op->write) |
4017eb91 | 3604 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3605 | else |
3606 | ret2 = -EINVAL; | |
4ed734b0 | 3607 | |
6ad7f233 PB |
3608 | if (req->flags & REQ_F_REISSUE) { |
3609 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3610 | ret2 = -EAGAIN; |
6ad7f233 | 3611 | } |
230d50d4 | 3612 | |
fa15bafb PB |
3613 | /* |
3614 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3615 | * retry them without IOCB_NOWAIT. | |
3616 | */ | |
3617 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3618 | ret2 = -EAGAIN; | |
75c668cd PB |
3619 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3620 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3621 | goto done; |
fa15bafb | 3622 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3623 | /* IOPOLL retry should happen for io-wq threads */ |
3624 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3625 | goto copy_iov; | |
355afaeb | 3626 | done: |
889fca73 | 3627 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3628 | } else { |
f67676d1 | 3629 | copy_iov: |
84216315 | 3630 | /* some cases will consume bytes even on error returns */ |
89c2b3b7 | 3631 | iov_iter_reexpand(iter, iter->count + iter->truncated); |
632546c4 | 3632 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3633 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3634 | return ret ?: -EAGAIN; |
2b188cc1 | 3635 | } |
31b51510 | 3636 | out_free: |
f261c168 | 3637 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3638 | if (iovec) |
6f2cc166 | 3639 | kfree(iovec); |
2b188cc1 JA |
3640 | return ret; |
3641 | } | |
3642 | ||
80a261fd JA |
3643 | static int io_renameat_prep(struct io_kiocb *req, |
3644 | const struct io_uring_sqe *sqe) | |
3645 | { | |
3646 | struct io_rename *ren = &req->rename; | |
3647 | const char __user *oldf, *newf; | |
3648 | ||
ed7eb259 JA |
3649 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3650 | return -EINVAL; | |
26578cda | 3651 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3652 | return -EINVAL; |
80a261fd JA |
3653 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3654 | return -EBADF; | |
3655 | ||
3656 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3657 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3658 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3659 | ren->new_dfd = READ_ONCE(sqe->len); | |
3660 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3661 | ||
3662 | ren->oldpath = getname(oldf); | |
3663 | if (IS_ERR(ren->oldpath)) | |
3664 | return PTR_ERR(ren->oldpath); | |
3665 | ||
3666 | ren->newpath = getname(newf); | |
3667 | if (IS_ERR(ren->newpath)) { | |
3668 | putname(ren->oldpath); | |
3669 | return PTR_ERR(ren->newpath); | |
3670 | } | |
3671 | ||
3672 | req->flags |= REQ_F_NEED_CLEANUP; | |
3673 | return 0; | |
3674 | } | |
3675 | ||
45d189c6 | 3676 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3677 | { |
3678 | struct io_rename *ren = &req->rename; | |
3679 | int ret; | |
3680 | ||
45d189c6 | 3681 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3682 | return -EAGAIN; |
3683 | ||
3684 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3685 | ren->newpath, ren->flags); | |
3686 | ||
3687 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3688 | if (ret < 0) | |
93d2bcd2 | 3689 | req_set_fail(req); |
80a261fd JA |
3690 | io_req_complete(req, ret); |
3691 | return 0; | |
3692 | } | |
3693 | ||
14a1143b JA |
3694 | static int io_unlinkat_prep(struct io_kiocb *req, |
3695 | const struct io_uring_sqe *sqe) | |
3696 | { | |
3697 | struct io_unlink *un = &req->unlink; | |
3698 | const char __user *fname; | |
3699 | ||
22634bc5 JA |
3700 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3701 | return -EINVAL; | |
26578cda PB |
3702 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3703 | sqe->splice_fd_in) | |
22634bc5 | 3704 | return -EINVAL; |
14a1143b JA |
3705 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3706 | return -EBADF; | |
3707 | ||
3708 | un->dfd = READ_ONCE(sqe->fd); | |
3709 | ||
3710 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3711 | if (un->flags & ~AT_REMOVEDIR) | |
3712 | return -EINVAL; | |
3713 | ||
3714 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3715 | un->filename = getname(fname); | |
3716 | if (IS_ERR(un->filename)) | |
3717 | return PTR_ERR(un->filename); | |
3718 | ||
3719 | req->flags |= REQ_F_NEED_CLEANUP; | |
3720 | return 0; | |
3721 | } | |
3722 | ||
45d189c6 | 3723 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3724 | { |
3725 | struct io_unlink *un = &req->unlink; | |
3726 | int ret; | |
3727 | ||
45d189c6 | 3728 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3729 | return -EAGAIN; |
3730 | ||
3731 | if (un->flags & AT_REMOVEDIR) | |
3732 | ret = do_rmdir(un->dfd, un->filename); | |
3733 | else | |
3734 | ret = do_unlinkat(un->dfd, un->filename); | |
3735 | ||
3736 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3737 | if (ret < 0) | |
93d2bcd2 | 3738 | req_set_fail(req); |
14a1143b JA |
3739 | io_req_complete(req, ret); |
3740 | return 0; | |
3741 | } | |
3742 | ||
e34a02dc DK |
3743 | static int io_mkdirat_prep(struct io_kiocb *req, |
3744 | const struct io_uring_sqe *sqe) | |
3745 | { | |
3746 | struct io_mkdir *mkd = &req->mkdir; | |
3747 | const char __user *fname; | |
3748 | ||
3749 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3750 | return -EINVAL; | |
3751 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3752 | sqe->splice_fd_in) | |
3753 | return -EINVAL; | |
3754 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3755 | return -EBADF; | |
3756 | ||
3757 | mkd->dfd = READ_ONCE(sqe->fd); | |
3758 | mkd->mode = READ_ONCE(sqe->len); | |
3759 | ||
3760 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3761 | mkd->filename = getname(fname); | |
3762 | if (IS_ERR(mkd->filename)) | |
3763 | return PTR_ERR(mkd->filename); | |
3764 | ||
3765 | req->flags |= REQ_F_NEED_CLEANUP; | |
3766 | return 0; | |
3767 | } | |
3768 | ||
3769 | static int io_mkdirat(struct io_kiocb *req, int issue_flags) | |
3770 | { | |
3771 | struct io_mkdir *mkd = &req->mkdir; | |
3772 | int ret; | |
3773 | ||
3774 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3775 | return -EAGAIN; | |
3776 | ||
3777 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3778 | ||
3779 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3780 | if (ret < 0) | |
3781 | req_set_fail(req); | |
3782 | io_req_complete(req, ret); | |
3783 | return 0; | |
3784 | } | |
3785 | ||
7a8721f8 DK |
3786 | static int io_symlinkat_prep(struct io_kiocb *req, |
3787 | const struct io_uring_sqe *sqe) | |
3788 | { | |
3789 | struct io_symlink *sl = &req->symlink; | |
3790 | const char __user *oldpath, *newpath; | |
3791 | ||
3792 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3793 | return -EINVAL; | |
3794 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3795 | sqe->splice_fd_in) | |
3796 | return -EINVAL; | |
3797 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3798 | return -EBADF; | |
3799 | ||
3800 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3801 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3802 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3803 | ||
3804 | sl->oldpath = getname(oldpath); | |
3805 | if (IS_ERR(sl->oldpath)) | |
3806 | return PTR_ERR(sl->oldpath); | |
3807 | ||
3808 | sl->newpath = getname(newpath); | |
3809 | if (IS_ERR(sl->newpath)) { | |
3810 | putname(sl->oldpath); | |
3811 | return PTR_ERR(sl->newpath); | |
3812 | } | |
3813 | ||
3814 | req->flags |= REQ_F_NEED_CLEANUP; | |
3815 | return 0; | |
3816 | } | |
3817 | ||
3818 | static int io_symlinkat(struct io_kiocb *req, int issue_flags) | |
3819 | { | |
3820 | struct io_symlink *sl = &req->symlink; | |
3821 | int ret; | |
3822 | ||
3823 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3824 | return -EAGAIN; | |
3825 | ||
3826 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3827 | ||
3828 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3829 | if (ret < 0) | |
3830 | req_set_fail(req); | |
3831 | io_req_complete(req, ret); | |
3832 | return 0; | |
3833 | } | |
3834 | ||
cf30da90 DK |
3835 | static int io_linkat_prep(struct io_kiocb *req, |
3836 | const struct io_uring_sqe *sqe) | |
3837 | { | |
3838 | struct io_hardlink *lnk = &req->hardlink; | |
3839 | const char __user *oldf, *newf; | |
3840 | ||
3841 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3842 | return -EINVAL; | |
3843 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3844 | return -EINVAL; | |
3845 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3846 | return -EBADF; | |
3847 | ||
3848 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
3849 | lnk->new_dfd = READ_ONCE(sqe->len); | |
3850 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3851 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3852 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
3853 | ||
3854 | lnk->oldpath = getname(oldf); | |
3855 | if (IS_ERR(lnk->oldpath)) | |
3856 | return PTR_ERR(lnk->oldpath); | |
3857 | ||
3858 | lnk->newpath = getname(newf); | |
3859 | if (IS_ERR(lnk->newpath)) { | |
3860 | putname(lnk->oldpath); | |
3861 | return PTR_ERR(lnk->newpath); | |
3862 | } | |
3863 | ||
3864 | req->flags |= REQ_F_NEED_CLEANUP; | |
3865 | return 0; | |
3866 | } | |
3867 | ||
3868 | static int io_linkat(struct io_kiocb *req, int issue_flags) | |
3869 | { | |
3870 | struct io_hardlink *lnk = &req->hardlink; | |
3871 | int ret; | |
3872 | ||
3873 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3874 | return -EAGAIN; | |
3875 | ||
3876 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
3877 | lnk->newpath, lnk->flags); | |
3878 | ||
3879 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3880 | if (ret < 0) | |
3881 | req_set_fail(req); | |
3882 | io_req_complete(req, ret); | |
3883 | return 0; | |
3884 | } | |
3885 | ||
36f4fa68 JA |
3886 | static int io_shutdown_prep(struct io_kiocb *req, |
3887 | const struct io_uring_sqe *sqe) | |
3888 | { | |
3889 | #if defined(CONFIG_NET) | |
3890 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3891 | return -EINVAL; | |
26578cda PB |
3892 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3893 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3894 | return -EINVAL; |
3895 | ||
3896 | req->shutdown.how = READ_ONCE(sqe->len); | |
3897 | return 0; | |
3898 | #else | |
3899 | return -EOPNOTSUPP; | |
3900 | #endif | |
3901 | } | |
3902 | ||
45d189c6 | 3903 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3904 | { |
3905 | #if defined(CONFIG_NET) | |
3906 | struct socket *sock; | |
3907 | int ret; | |
3908 | ||
45d189c6 | 3909 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3910 | return -EAGAIN; |
3911 | ||
48aba79b | 3912 | sock = sock_from_file(req->file); |
36f4fa68 | 3913 | if (unlikely(!sock)) |
48aba79b | 3914 | return -ENOTSOCK; |
36f4fa68 JA |
3915 | |
3916 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3917 | if (ret < 0) |
93d2bcd2 | 3918 | req_set_fail(req); |
36f4fa68 JA |
3919 | io_req_complete(req, ret); |
3920 | return 0; | |
3921 | #else | |
3922 | return -EOPNOTSUPP; | |
3923 | #endif | |
3924 | } | |
3925 | ||
f2a8d5c7 PB |
3926 | static int __io_splice_prep(struct io_kiocb *req, |
3927 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3928 | { |
fe7e3257 | 3929 | struct io_splice *sp = &req->splice; |
7d67af2c | 3930 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3931 | |
3232dd02 PB |
3932 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3933 | return -EINVAL; | |
7d67af2c PB |
3934 | |
3935 | sp->file_in = NULL; | |
7d67af2c PB |
3936 | sp->len = READ_ONCE(sqe->len); |
3937 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3938 | ||
3939 | if (unlikely(sp->flags & ~valid_flags)) | |
3940 | return -EINVAL; | |
3941 | ||
62906e89 | 3942 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
3943 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3944 | if (!sp->file_in) | |
3945 | return -EBADF; | |
7d67af2c | 3946 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3947 | return 0; |
3948 | } | |
3949 | ||
f2a8d5c7 PB |
3950 | static int io_tee_prep(struct io_kiocb *req, |
3951 | const struct io_uring_sqe *sqe) | |
3952 | { | |
3953 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3954 | return -EINVAL; | |
3955 | return __io_splice_prep(req, sqe); | |
3956 | } | |
3957 | ||
45d189c6 | 3958 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3959 | { |
3960 | struct io_splice *sp = &req->splice; | |
3961 | struct file *in = sp->file_in; | |
3962 | struct file *out = sp->file_out; | |
3963 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3964 | long ret = 0; | |
3965 | ||
45d189c6 | 3966 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3967 | return -EAGAIN; |
3968 | if (sp->len) | |
3969 | ret = do_tee(in, out, sp->len, flags); | |
3970 | ||
e1d767f0 PB |
3971 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3972 | io_put_file(in); | |
f2a8d5c7 PB |
3973 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3974 | ||
f2a8d5c7 | 3975 | if (ret != sp->len) |
93d2bcd2 | 3976 | req_set_fail(req); |
e1e16097 | 3977 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3978 | return 0; |
3979 | } | |
3980 | ||
3981 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3982 | { | |
fe7e3257 | 3983 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3984 | |
3985 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3986 | sp->off_out = READ_ONCE(sqe->off); | |
3987 | return __io_splice_prep(req, sqe); | |
3988 | } | |
3989 | ||
45d189c6 | 3990 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3991 | { |
3992 | struct io_splice *sp = &req->splice; | |
3993 | struct file *in = sp->file_in; | |
3994 | struct file *out = sp->file_out; | |
3995 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3996 | loff_t *poff_in, *poff_out; | |
c9687426 | 3997 | long ret = 0; |
7d67af2c | 3998 | |
45d189c6 | 3999 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4000 | return -EAGAIN; |
7d67af2c PB |
4001 | |
4002 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4003 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4004 | |
948a7749 | 4005 | if (sp->len) |
c9687426 | 4006 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4007 | |
e1d767f0 PB |
4008 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4009 | io_put_file(in); | |
7d67af2c PB |
4010 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4011 | ||
7d67af2c | 4012 | if (ret != sp->len) |
93d2bcd2 | 4013 | req_set_fail(req); |
e1e16097 | 4014 | io_req_complete(req, ret); |
7d67af2c PB |
4015 | return 0; |
4016 | } | |
4017 | ||
2b188cc1 JA |
4018 | /* |
4019 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4020 | */ | |
889fca73 | 4021 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4022 | { |
4023 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4024 | |
def596e9 JA |
4025 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4026 | return -EINVAL; | |
4027 | ||
889fca73 | 4028 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4029 | return 0; |
4030 | } | |
4031 | ||
1155c76a | 4032 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4033 | { |
6b06314c | 4034 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4035 | |
09bb8394 JA |
4036 | if (!req->file) |
4037 | return -EBADF; | |
c992fe29 | 4038 | |
6b06314c | 4039 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4040 | return -EINVAL; |
26578cda PB |
4041 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4042 | sqe->splice_fd_in)) | |
c992fe29 CH |
4043 | return -EINVAL; |
4044 | ||
8ed8d3c3 JA |
4045 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4046 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4047 | return -EINVAL; | |
4048 | ||
4049 | req->sync.off = READ_ONCE(sqe->off); | |
4050 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4051 | return 0; |
4052 | } | |
4053 | ||
45d189c6 | 4054 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4055 | { |
8ed8d3c3 | 4056 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4057 | int ret; |
4058 | ||
ac45abc0 | 4059 | /* fsync always requires a blocking context */ |
45d189c6 | 4060 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4061 | return -EAGAIN; |
4062 | ||
9adbd45d | 4063 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4064 | end > 0 ? end : LLONG_MAX, |
4065 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4066 | if (ret < 0) | |
93d2bcd2 | 4067 | req_set_fail(req); |
e1e16097 | 4068 | io_req_complete(req, ret); |
c992fe29 CH |
4069 | return 0; |
4070 | } | |
4071 | ||
d63d1b5e JA |
4072 | static int io_fallocate_prep(struct io_kiocb *req, |
4073 | const struct io_uring_sqe *sqe) | |
4074 | { | |
26578cda PB |
4075 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4076 | sqe->splice_fd_in) | |
d63d1b5e | 4077 | return -EINVAL; |
3232dd02 PB |
4078 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4079 | return -EINVAL; | |
d63d1b5e JA |
4080 | |
4081 | req->sync.off = READ_ONCE(sqe->off); | |
4082 | req->sync.len = READ_ONCE(sqe->addr); | |
4083 | req->sync.mode = READ_ONCE(sqe->len); | |
4084 | return 0; | |
4085 | } | |
4086 | ||
45d189c6 | 4087 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4088 | { |
ac45abc0 PB |
4089 | int ret; |
4090 | ||
d63d1b5e | 4091 | /* fallocate always requiring blocking context */ |
45d189c6 | 4092 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4093 | return -EAGAIN; |
ac45abc0 PB |
4094 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4095 | req->sync.len); | |
ac45abc0 | 4096 | if (ret < 0) |
93d2bcd2 | 4097 | req_set_fail(req); |
e1e16097 | 4098 | io_req_complete(req, ret); |
5d17b4a4 JA |
4099 | return 0; |
4100 | } | |
4101 | ||
ec65fea5 | 4102 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4103 | { |
f8748881 | 4104 | const char __user *fname; |
15b71abe | 4105 | int ret; |
b7bb4f7d | 4106 | |
d3fddf6d PB |
4107 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4108 | return -EINVAL; | |
b9445598 | 4109 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4110 | return -EINVAL; |
ec65fea5 | 4111 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4112 | return -EBADF; |
03b1230c | 4113 | |
ec65fea5 PB |
4114 | /* open.how should be already initialised */ |
4115 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4116 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4117 | |
25e72d10 PB |
4118 | req->open.dfd = READ_ONCE(sqe->fd); |
4119 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4120 | req->open.filename = getname(fname); |
15b71abe JA |
4121 | if (IS_ERR(req->open.filename)) { |
4122 | ret = PTR_ERR(req->open.filename); | |
4123 | req->open.filename = NULL; | |
4124 | return ret; | |
4125 | } | |
b9445598 PB |
4126 | |
4127 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4128 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4129 | return -EINVAL; | |
4130 | ||
4022e7af | 4131 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4132 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4133 | return 0; |
03b1230c JA |
4134 | } |
4135 | ||
ec65fea5 PB |
4136 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4137 | { | |
d3fddf6d PB |
4138 | u64 mode = READ_ONCE(sqe->len); |
4139 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4140 | |
ec65fea5 PB |
4141 | req->open.how = build_open_how(flags, mode); |
4142 | return __io_openat_prep(req, sqe); | |
4143 | } | |
4144 | ||
cebdb986 | 4145 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4146 | { |
cebdb986 | 4147 | struct open_how __user *how; |
cebdb986 | 4148 | size_t len; |
0fa03c62 JA |
4149 | int ret; |
4150 | ||
cebdb986 JA |
4151 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4152 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4153 | if (len < OPEN_HOW_SIZE_VER0) |
4154 | return -EINVAL; | |
3529d8c2 | 4155 | |
cebdb986 JA |
4156 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4157 | len); | |
4158 | if (ret) | |
4159 | return ret; | |
3529d8c2 | 4160 | |
ec65fea5 | 4161 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4162 | } |
4163 | ||
45d189c6 | 4164 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4165 | { |
4166 | struct open_flags op; | |
15b71abe | 4167 | struct file *file; |
b9445598 PB |
4168 | bool resolve_nonblock, nonblock_set; |
4169 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4170 | int ret; |
4171 | ||
cebdb986 | 4172 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4173 | if (ret) |
4174 | goto err; | |
3a81fd02 JA |
4175 | nonblock_set = op.open_flag & O_NONBLOCK; |
4176 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4177 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4178 | /* |
4179 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4180 | * it'll always -EAGAIN | |
4181 | */ | |
4182 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4183 | return -EAGAIN; | |
4184 | op.lookup_flags |= LOOKUP_CACHED; | |
4185 | op.open_flag |= O_NONBLOCK; | |
4186 | } | |
15b71abe | 4187 | |
b9445598 PB |
4188 | if (!fixed) { |
4189 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4190 | if (ret < 0) | |
4191 | goto err; | |
4192 | } | |
15b71abe JA |
4193 | |
4194 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4195 | if (IS_ERR(file)) { |
944d1444 | 4196 | /* |
12dcb58a PB |
4197 | * We could hang on to this 'fd' on retrying, but seems like |
4198 | * marginal gain for something that is now known to be a slower | |
4199 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4200 | */ |
b9445598 PB |
4201 | if (!fixed) |
4202 | put_unused_fd(ret); | |
3a81fd02 | 4203 | |
15b71abe | 4204 | ret = PTR_ERR(file); |
12dcb58a PB |
4205 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4206 | if (ret == -EAGAIN && | |
4207 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4208 | return -EAGAIN; | |
4209 | goto err; | |
15b71abe | 4210 | } |
12dcb58a PB |
4211 | |
4212 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4213 | file->f_flags &= ~O_NONBLOCK; | |
4214 | fsnotify_open(file); | |
b9445598 PB |
4215 | |
4216 | if (!fixed) | |
4217 | fd_install(ret, file); | |
4218 | else | |
4219 | ret = io_install_fixed_file(req, file, issue_flags, | |
4220 | req->open.file_slot - 1); | |
15b71abe JA |
4221 | err: |
4222 | putname(req->open.filename); | |
8fef80bf | 4223 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4224 | if (ret < 0) |
93d2bcd2 | 4225 | req_set_fail(req); |
0bdf3398 | 4226 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4227 | return 0; |
4228 | } | |
4229 | ||
45d189c6 | 4230 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4231 | { |
e45cff58 | 4232 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4233 | } |
4234 | ||
067524e9 JA |
4235 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4236 | const struct io_uring_sqe *sqe) | |
4237 | { | |
4238 | struct io_provide_buf *p = &req->pbuf; | |
4239 | u64 tmp; | |
4240 | ||
26578cda PB |
4241 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4242 | sqe->splice_fd_in) | |
067524e9 JA |
4243 | return -EINVAL; |
4244 | ||
4245 | tmp = READ_ONCE(sqe->fd); | |
4246 | if (!tmp || tmp > USHRT_MAX) | |
4247 | return -EINVAL; | |
4248 | ||
4249 | memset(p, 0, sizeof(*p)); | |
4250 | p->nbufs = tmp; | |
4251 | p->bgid = READ_ONCE(sqe->buf_group); | |
4252 | return 0; | |
4253 | } | |
4254 | ||
4255 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4256 | int bgid, unsigned nbufs) | |
4257 | { | |
4258 | unsigned i = 0; | |
4259 | ||
4260 | /* shouldn't happen */ | |
4261 | if (!nbufs) | |
4262 | return 0; | |
4263 | ||
4264 | /* the head kbuf is the list itself */ | |
4265 | while (!list_empty(&buf->list)) { | |
4266 | struct io_buffer *nxt; | |
4267 | ||
4268 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4269 | list_del(&nxt->list); | |
4270 | kfree(nxt); | |
4271 | if (++i == nbufs) | |
4272 | return i; | |
4273 | } | |
4274 | i++; | |
4275 | kfree(buf); | |
9e15c3a0 | 4276 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4277 | |
4278 | return i; | |
4279 | } | |
4280 | ||
889fca73 | 4281 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4282 | { |
4283 | struct io_provide_buf *p = &req->pbuf; | |
4284 | struct io_ring_ctx *ctx = req->ctx; | |
4285 | struct io_buffer *head; | |
4286 | int ret = 0; | |
45d189c6 | 4287 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4288 | |
4289 | io_ring_submit_lock(ctx, !force_nonblock); | |
4290 | ||
4291 | lockdep_assert_held(&ctx->uring_lock); | |
4292 | ||
4293 | ret = -ENOENT; | |
9e15c3a0 | 4294 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4295 | if (head) |
4296 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4297 | if (ret < 0) |
93d2bcd2 | 4298 | req_set_fail(req); |
067524e9 | 4299 | |
9fb8cb49 PB |
4300 | /* complete before unlock, IOPOLL may need the lock */ |
4301 | __io_req_complete(req, issue_flags, ret, 0); | |
4302 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
4303 | return 0; |
4304 | } | |
4305 | ||
ddf0322d JA |
4306 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4307 | const struct io_uring_sqe *sqe) | |
4308 | { | |
38134ada | 4309 | unsigned long size, tmp_check; |
ddf0322d JA |
4310 | struct io_provide_buf *p = &req->pbuf; |
4311 | u64 tmp; | |
4312 | ||
26578cda | 4313 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4314 | return -EINVAL; |
4315 | ||
4316 | tmp = READ_ONCE(sqe->fd); | |
4317 | if (!tmp || tmp > USHRT_MAX) | |
4318 | return -E2BIG; | |
4319 | p->nbufs = tmp; | |
4320 | p->addr = READ_ONCE(sqe->addr); | |
4321 | p->len = READ_ONCE(sqe->len); | |
4322 | ||
38134ada PB |
4323 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4324 | &size)) | |
4325 | return -EOVERFLOW; | |
4326 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4327 | return -EOVERFLOW; | |
4328 | ||
d81269fe PB |
4329 | size = (unsigned long)p->len * p->nbufs; |
4330 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4331 | return -EFAULT; |
4332 | ||
4333 | p->bgid = READ_ONCE(sqe->buf_group); | |
4334 | tmp = READ_ONCE(sqe->off); | |
4335 | if (tmp > USHRT_MAX) | |
4336 | return -E2BIG; | |
4337 | p->bid = tmp; | |
4338 | return 0; | |
4339 | } | |
4340 | ||
4341 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4342 | { | |
4343 | struct io_buffer *buf; | |
4344 | u64 addr = pbuf->addr; | |
4345 | int i, bid = pbuf->bid; | |
4346 | ||
4347 | for (i = 0; i < pbuf->nbufs; i++) { | |
4348 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4349 | if (!buf) | |
4350 | break; | |
4351 | ||
4352 | buf->addr = addr; | |
d1f82808 | 4353 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4354 | buf->bid = bid; |
4355 | addr += pbuf->len; | |
4356 | bid++; | |
4357 | if (!*head) { | |
4358 | INIT_LIST_HEAD(&buf->list); | |
4359 | *head = buf; | |
4360 | } else { | |
4361 | list_add_tail(&buf->list, &(*head)->list); | |
4362 | } | |
4363 | } | |
4364 | ||
4365 | return i ? i : -ENOMEM; | |
4366 | } | |
4367 | ||
889fca73 | 4368 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4369 | { |
4370 | struct io_provide_buf *p = &req->pbuf; | |
4371 | struct io_ring_ctx *ctx = req->ctx; | |
4372 | struct io_buffer *head, *list; | |
4373 | int ret = 0; | |
45d189c6 | 4374 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4375 | |
4376 | io_ring_submit_lock(ctx, !force_nonblock); | |
4377 | ||
4378 | lockdep_assert_held(&ctx->uring_lock); | |
4379 | ||
9e15c3a0 | 4380 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4381 | |
4382 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4383 | if (ret >= 0 && !list) { |
4384 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4385 | if (ret < 0) | |
067524e9 | 4386 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4387 | } |
ddf0322d | 4388 | if (ret < 0) |
93d2bcd2 | 4389 | req_set_fail(req); |
9fb8cb49 PB |
4390 | /* complete before unlock, IOPOLL may need the lock */ |
4391 | __io_req_complete(req, issue_flags, ret, 0); | |
4392 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4393 | return 0; |
cebdb986 JA |
4394 | } |
4395 | ||
3e4827b0 JA |
4396 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4397 | const struct io_uring_sqe *sqe) | |
4398 | { | |
4399 | #if defined(CONFIG_EPOLL) | |
26578cda | 4400 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4401 | return -EINVAL; |
2d74d042 | 4402 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4403 | return -EINVAL; |
3e4827b0 JA |
4404 | |
4405 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4406 | req->epoll.op = READ_ONCE(sqe->len); | |
4407 | req->epoll.fd = READ_ONCE(sqe->off); | |
4408 | ||
4409 | if (ep_op_has_event(req->epoll.op)) { | |
4410 | struct epoll_event __user *ev; | |
4411 | ||
4412 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4413 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4414 | return -EFAULT; | |
4415 | } | |
4416 | ||
4417 | return 0; | |
4418 | #else | |
4419 | return -EOPNOTSUPP; | |
4420 | #endif | |
4421 | } | |
4422 | ||
889fca73 | 4423 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4424 | { |
4425 | #if defined(CONFIG_EPOLL) | |
4426 | struct io_epoll *ie = &req->epoll; | |
4427 | int ret; | |
45d189c6 | 4428 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4429 | |
4430 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4431 | if (force_nonblock && ret == -EAGAIN) | |
4432 | return -EAGAIN; | |
4433 | ||
4434 | if (ret < 0) | |
93d2bcd2 | 4435 | req_set_fail(req); |
889fca73 | 4436 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4437 | return 0; |
4438 | #else | |
4439 | return -EOPNOTSUPP; | |
4440 | #endif | |
4441 | } | |
4442 | ||
c1ca757b JA |
4443 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4444 | { | |
4445 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4446 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4447 | return -EINVAL; |
3232dd02 PB |
4448 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4449 | return -EINVAL; | |
c1ca757b JA |
4450 | |
4451 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4452 | req->madvise.len = READ_ONCE(sqe->len); | |
4453 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4454 | return 0; | |
4455 | #else | |
4456 | return -EOPNOTSUPP; | |
4457 | #endif | |
4458 | } | |
4459 | ||
45d189c6 | 4460 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4461 | { |
4462 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4463 | struct io_madvise *ma = &req->madvise; | |
4464 | int ret; | |
4465 | ||
45d189c6 | 4466 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4467 | return -EAGAIN; |
4468 | ||
0726b01e | 4469 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4470 | if (ret < 0) |
93d2bcd2 | 4471 | req_set_fail(req); |
e1e16097 | 4472 | io_req_complete(req, ret); |
c1ca757b JA |
4473 | return 0; |
4474 | #else | |
4475 | return -EOPNOTSUPP; | |
4476 | #endif | |
4477 | } | |
4478 | ||
4840e418 JA |
4479 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4480 | { | |
26578cda | 4481 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4482 | return -EINVAL; |
3232dd02 PB |
4483 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4484 | return -EINVAL; | |
4840e418 JA |
4485 | |
4486 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4487 | req->fadvise.len = READ_ONCE(sqe->len); | |
4488 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4489 | return 0; | |
4490 | } | |
4491 | ||
45d189c6 | 4492 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4493 | { |
4494 | struct io_fadvise *fa = &req->fadvise; | |
4495 | int ret; | |
4496 | ||
45d189c6 | 4497 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4498 | switch (fa->advice) { |
4499 | case POSIX_FADV_NORMAL: | |
4500 | case POSIX_FADV_RANDOM: | |
4501 | case POSIX_FADV_SEQUENTIAL: | |
4502 | break; | |
4503 | default: | |
4504 | return -EAGAIN; | |
4505 | } | |
4506 | } | |
4840e418 JA |
4507 | |
4508 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4509 | if (ret < 0) | |
93d2bcd2 | 4510 | req_set_fail(req); |
0bdf3398 | 4511 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4512 | return 0; |
4513 | } | |
4514 | ||
eddc7ef5 JA |
4515 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4516 | { | |
2d74d042 | 4517 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4518 | return -EINVAL; |
26578cda | 4519 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4520 | return -EINVAL; |
9c280f90 | 4521 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4522 | return -EBADF; |
eddc7ef5 | 4523 | |
1d9e1288 BM |
4524 | req->statx.dfd = READ_ONCE(sqe->fd); |
4525 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4526 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4527 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4528 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4529 | |
4530 | return 0; | |
4531 | } | |
4532 | ||
45d189c6 | 4533 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4534 | { |
1d9e1288 | 4535 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4536 | int ret; |
4537 | ||
59d70013 | 4538 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4539 | return -EAGAIN; |
4540 | ||
e62753e4 BM |
4541 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4542 | ctx->buffer); | |
eddc7ef5 | 4543 | |
eddc7ef5 | 4544 | if (ret < 0) |
93d2bcd2 | 4545 | req_set_fail(req); |
e1e16097 | 4546 | io_req_complete(req, ret); |
eddc7ef5 JA |
4547 | return 0; |
4548 | } | |
4549 | ||
b5dba59e JA |
4550 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4551 | { | |
14587a46 | 4552 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4553 | return -EINVAL; |
b5dba59e | 4554 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
26578cda | 4555 | sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
b5dba59e | 4556 | return -EINVAL; |
9c280f90 | 4557 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4558 | return -EBADF; |
b5dba59e JA |
4559 | |
4560 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4561 | return 0; |
b5dba59e JA |
4562 | } |
4563 | ||
889fca73 | 4564 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4565 | { |
9eac1904 | 4566 | struct files_struct *files = current->files; |
3af73b28 | 4567 | struct io_close *close = &req->close; |
9eac1904 | 4568 | struct fdtable *fdt; |
a1fde923 PB |
4569 | struct file *file = NULL; |
4570 | int ret = -EBADF; | |
b5dba59e | 4571 | |
9eac1904 JA |
4572 | spin_lock(&files->file_lock); |
4573 | fdt = files_fdtable(files); | |
4574 | if (close->fd >= fdt->max_fds) { | |
4575 | spin_unlock(&files->file_lock); | |
4576 | goto err; | |
4577 | } | |
4578 | file = fdt->fd[close->fd]; | |
a1fde923 | 4579 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4580 | spin_unlock(&files->file_lock); |
4581 | file = NULL; | |
4582 | goto err; | |
3af73b28 | 4583 | } |
b5dba59e JA |
4584 | |
4585 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4586 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4587 | spin_unlock(&files->file_lock); |
0bf0eefd | 4588 | return -EAGAIN; |
a2100672 | 4589 | } |
b5dba59e | 4590 | |
9eac1904 JA |
4591 | ret = __close_fd_get_file(close->fd, &file); |
4592 | spin_unlock(&files->file_lock); | |
4593 | if (ret < 0) { | |
4594 | if (ret == -ENOENT) | |
4595 | ret = -EBADF; | |
4596 | goto err; | |
4597 | } | |
4598 | ||
3af73b28 | 4599 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4600 | ret = filp_close(file, current->files); |
4601 | err: | |
3af73b28 | 4602 | if (ret < 0) |
93d2bcd2 | 4603 | req_set_fail(req); |
9eac1904 JA |
4604 | if (file) |
4605 | fput(file); | |
889fca73 | 4606 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4607 | return 0; |
b5dba59e JA |
4608 | } |
4609 | ||
1155c76a | 4610 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4611 | { |
4612 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4613 | |
5d17b4a4 JA |
4614 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4615 | return -EINVAL; | |
26578cda PB |
4616 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4617 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4618 | return -EINVAL; |
4619 | ||
8ed8d3c3 JA |
4620 | req->sync.off = READ_ONCE(sqe->off); |
4621 | req->sync.len = READ_ONCE(sqe->len); | |
4622 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4623 | return 0; |
4624 | } | |
4625 | ||
45d189c6 | 4626 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4627 | { |
8ed8d3c3 JA |
4628 | int ret; |
4629 | ||
ac45abc0 | 4630 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4631 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4632 | return -EAGAIN; |
4633 | ||
9adbd45d | 4634 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4635 | req->sync.flags); |
4636 | if (ret < 0) | |
93d2bcd2 | 4637 | req_set_fail(req); |
e1e16097 | 4638 | io_req_complete(req, ret); |
5d17b4a4 JA |
4639 | return 0; |
4640 | } | |
4641 | ||
469956e8 | 4642 | #if defined(CONFIG_NET) |
02d27d89 PB |
4643 | static int io_setup_async_msg(struct io_kiocb *req, |
4644 | struct io_async_msghdr *kmsg) | |
4645 | { | |
e8c2bc1f JA |
4646 | struct io_async_msghdr *async_msg = req->async_data; |
4647 | ||
4648 | if (async_msg) | |
02d27d89 | 4649 | return -EAGAIN; |
e8c2bc1f | 4650 | if (io_alloc_async_data(req)) { |
257e84a5 | 4651 | kfree(kmsg->free_iov); |
02d27d89 PB |
4652 | return -ENOMEM; |
4653 | } | |
e8c2bc1f | 4654 | async_msg = req->async_data; |
02d27d89 | 4655 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4656 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4657 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4658 | /* if were using fast_iov, set it to the new one */ |
4659 | if (!async_msg->free_iov) | |
4660 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4661 | ||
02d27d89 PB |
4662 | return -EAGAIN; |
4663 | } | |
4664 | ||
2ae523ed PB |
4665 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4666 | struct io_async_msghdr *iomsg) | |
4667 | { | |
2ae523ed | 4668 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4669 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4670 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4671 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4672 | } |
4673 | ||
93642ef8 PB |
4674 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4675 | { | |
4676 | int ret; | |
4677 | ||
93642ef8 PB |
4678 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4679 | if (!ret) | |
4680 | req->flags |= REQ_F_NEED_CLEANUP; | |
4681 | return ret; | |
4682 | } | |
4683 | ||
3529d8c2 | 4684 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4685 | { |
e47293fd | 4686 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4687 | |
d2b6f48b PB |
4688 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4689 | return -EINVAL; | |
4690 | ||
270a5940 | 4691 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4692 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4693 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4694 | if (sr->msg_flags & MSG_DONTWAIT) | |
4695 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4696 | |
d8768362 JA |
4697 | #ifdef CONFIG_COMPAT |
4698 | if (req->ctx->compat) | |
4699 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4700 | #endif | |
93642ef8 | 4701 | return 0; |
03b1230c JA |
4702 | } |
4703 | ||
889fca73 | 4704 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4705 | { |
6b754c8b | 4706 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4707 | struct socket *sock; |
7a7cacba | 4708 | unsigned flags; |
0031275d | 4709 | int min_ret = 0; |
0fa03c62 JA |
4710 | int ret; |
4711 | ||
dba4a925 | 4712 | sock = sock_from_file(req->file); |
7a7cacba | 4713 | if (unlikely(!sock)) |
dba4a925 | 4714 | return -ENOTSOCK; |
3529d8c2 | 4715 | |
257e84a5 PB |
4716 | kmsg = req->async_data; |
4717 | if (!kmsg) { | |
7a7cacba PB |
4718 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4719 | if (ret) | |
4720 | return ret; | |
4721 | kmsg = &iomsg; | |
0fa03c62 | 4722 | } |
0fa03c62 | 4723 | |
04411806 PB |
4724 | flags = req->sr_msg.msg_flags; |
4725 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4726 | flags |= MSG_DONTWAIT; |
0031275d SM |
4727 | if (flags & MSG_WAITALL) |
4728 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4729 | ||
7a7cacba | 4730 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4731 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4732 | return io_setup_async_msg(req, kmsg); |
4733 | if (ret == -ERESTARTSYS) | |
4734 | ret = -EINTR; | |
0fa03c62 | 4735 | |
257e84a5 PB |
4736 | /* fast path, check for non-NULL to avoid function call */ |
4737 | if (kmsg->free_iov) | |
4738 | kfree(kmsg->free_iov); | |
99bc4c38 | 4739 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4740 | if (ret < min_ret) |
93d2bcd2 | 4741 | req_set_fail(req); |
889fca73 | 4742 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4743 | return 0; |
03b1230c | 4744 | } |
aa1fa28f | 4745 | |
889fca73 | 4746 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4747 | { |
7a7cacba PB |
4748 | struct io_sr_msg *sr = &req->sr_msg; |
4749 | struct msghdr msg; | |
4750 | struct iovec iov; | |
fddaface | 4751 | struct socket *sock; |
7a7cacba | 4752 | unsigned flags; |
0031275d | 4753 | int min_ret = 0; |
fddaface JA |
4754 | int ret; |
4755 | ||
dba4a925 | 4756 | sock = sock_from_file(req->file); |
7a7cacba | 4757 | if (unlikely(!sock)) |
dba4a925 | 4758 | return -ENOTSOCK; |
fddaface | 4759 | |
7a7cacba PB |
4760 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4761 | if (unlikely(ret)) | |
14db8411 | 4762 | return ret; |
fddaface | 4763 | |
7a7cacba PB |
4764 | msg.msg_name = NULL; |
4765 | msg.msg_control = NULL; | |
4766 | msg.msg_controllen = 0; | |
4767 | msg.msg_namelen = 0; | |
fddaface | 4768 | |
04411806 PB |
4769 | flags = req->sr_msg.msg_flags; |
4770 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4771 | flags |= MSG_DONTWAIT; |
0031275d SM |
4772 | if (flags & MSG_WAITALL) |
4773 | min_ret = iov_iter_count(&msg.msg_iter); | |
4774 | ||
7a7cacba PB |
4775 | msg.msg_flags = flags; |
4776 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4777 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4778 | return -EAGAIN; |
4779 | if (ret == -ERESTARTSYS) | |
4780 | ret = -EINTR; | |
fddaface | 4781 | |
0031275d | 4782 | if (ret < min_ret) |
93d2bcd2 | 4783 | req_set_fail(req); |
889fca73 | 4784 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4785 | return 0; |
fddaface JA |
4786 | } |
4787 | ||
1400e697 PB |
4788 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4789 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4790 | { |
4791 | struct io_sr_msg *sr = &req->sr_msg; | |
4792 | struct iovec __user *uiov; | |
4793 | size_t iov_len; | |
4794 | int ret; | |
4795 | ||
1400e697 PB |
4796 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4797 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4798 | if (ret) |
4799 | return ret; | |
4800 | ||
4801 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4802 | if (iov_len > 1) | |
4803 | return -EINVAL; | |
5476dfed | 4804 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4805 | return -EFAULT; |
5476dfed | 4806 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4807 | iomsg->free_iov = NULL; |
52de1fe1 | 4808 | } else { |
257e84a5 | 4809 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4810 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4811 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4812 | false); |
52de1fe1 JA |
4813 | if (ret > 0) |
4814 | ret = 0; | |
4815 | } | |
4816 | ||
4817 | return ret; | |
4818 | } | |
4819 | ||
4820 | #ifdef CONFIG_COMPAT | |
4821 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4822 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4823 | { |
52de1fe1 JA |
4824 | struct io_sr_msg *sr = &req->sr_msg; |
4825 | struct compat_iovec __user *uiov; | |
4826 | compat_uptr_t ptr; | |
4827 | compat_size_t len; | |
4828 | int ret; | |
4829 | ||
4af3417a PB |
4830 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4831 | &ptr, &len); | |
52de1fe1 JA |
4832 | if (ret) |
4833 | return ret; | |
4834 | ||
4835 | uiov = compat_ptr(ptr); | |
4836 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4837 | compat_ssize_t clen; | |
4838 | ||
4839 | if (len > 1) | |
4840 | return -EINVAL; | |
4841 | if (!access_ok(uiov, sizeof(*uiov))) | |
4842 | return -EFAULT; | |
4843 | if (__get_user(clen, &uiov->iov_len)) | |
4844 | return -EFAULT; | |
4845 | if (clen < 0) | |
4846 | return -EINVAL; | |
2d280bc8 | 4847 | sr->len = clen; |
257e84a5 | 4848 | iomsg->free_iov = NULL; |
52de1fe1 | 4849 | } else { |
257e84a5 | 4850 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4851 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4852 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4853 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4854 | if (ret < 0) |
4855 | return ret; | |
4856 | } | |
4857 | ||
4858 | return 0; | |
4859 | } | |
4860 | #endif | |
4861 | ||
1400e697 PB |
4862 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4863 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4864 | { |
1400e697 | 4865 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4866 | |
4867 | #ifdef CONFIG_COMPAT | |
4868 | if (req->ctx->compat) | |
1400e697 | 4869 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4870 | #endif |
52de1fe1 | 4871 | |
1400e697 | 4872 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4873 | } |
4874 | ||
bcda7baa | 4875 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4876 | bool needs_lock) |
bcda7baa JA |
4877 | { |
4878 | struct io_sr_msg *sr = &req->sr_msg; | |
4879 | struct io_buffer *kbuf; | |
4880 | ||
bcda7baa JA |
4881 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4882 | if (IS_ERR(kbuf)) | |
4883 | return kbuf; | |
4884 | ||
4885 | sr->kbuf = kbuf; | |
4886 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4887 | return kbuf; |
fddaface JA |
4888 | } |
4889 | ||
7fbb1b54 PB |
4890 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4891 | { | |
4892 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4893 | } | |
4894 | ||
93642ef8 | 4895 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4896 | { |
99bc4c38 | 4897 | int ret; |
3529d8c2 | 4898 | |
93642ef8 PB |
4899 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4900 | if (!ret) | |
4901 | req->flags |= REQ_F_NEED_CLEANUP; | |
4902 | return ret; | |
4903 | } | |
4904 | ||
4905 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4906 | { | |
4907 | struct io_sr_msg *sr = &req->sr_msg; | |
4908 | ||
d2b6f48b PB |
4909 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4910 | return -EINVAL; | |
4911 | ||
270a5940 | 4912 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4913 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4914 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4915 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4916 | if (sr->msg_flags & MSG_DONTWAIT) | |
4917 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4918 | |
d8768362 JA |
4919 | #ifdef CONFIG_COMPAT |
4920 | if (req->ctx->compat) | |
4921 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4922 | #endif | |
93642ef8 | 4923 | return 0; |
aa1fa28f JA |
4924 | } |
4925 | ||
889fca73 | 4926 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4927 | { |
6b754c8b | 4928 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4929 | struct socket *sock; |
7fbb1b54 | 4930 | struct io_buffer *kbuf; |
7a7cacba | 4931 | unsigned flags; |
0031275d | 4932 | int min_ret = 0; |
52de1fe1 | 4933 | int ret, cflags = 0; |
45d189c6 | 4934 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4935 | |
dba4a925 | 4936 | sock = sock_from_file(req->file); |
7a7cacba | 4937 | if (unlikely(!sock)) |
dba4a925 | 4938 | return -ENOTSOCK; |
3529d8c2 | 4939 | |
257e84a5 PB |
4940 | kmsg = req->async_data; |
4941 | if (!kmsg) { | |
7a7cacba PB |
4942 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4943 | if (ret) | |
681fda8d | 4944 | return ret; |
7a7cacba PB |
4945 | kmsg = &iomsg; |
4946 | } | |
03b1230c | 4947 | |
bc02ef33 | 4948 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4949 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4950 | if (IS_ERR(kbuf)) |
52de1fe1 | 4951 | return PTR_ERR(kbuf); |
7a7cacba | 4952 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4953 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4954 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4955 | 1, req->sr_msg.len); |
4956 | } | |
52de1fe1 | 4957 | |
04411806 PB |
4958 | flags = req->sr_msg.msg_flags; |
4959 | if (force_nonblock) | |
7a7cacba | 4960 | flags |= MSG_DONTWAIT; |
0031275d SM |
4961 | if (flags & MSG_WAITALL) |
4962 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4963 | ||
7a7cacba PB |
4964 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4965 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4966 | if (force_nonblock && ret == -EAGAIN) |
4967 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4968 | if (ret == -ERESTARTSYS) |
4969 | ret = -EINTR; | |
03b1230c | 4970 | |
7fbb1b54 PB |
4971 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4972 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4973 | /* fast path, check for non-NULL to avoid function call */ |
4974 | if (kmsg->free_iov) | |
4975 | kfree(kmsg->free_iov); | |
99bc4c38 | 4976 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4977 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4978 | req_set_fail(req); |
889fca73 | 4979 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4980 | return 0; |
0fa03c62 | 4981 | } |
5d17b4a4 | 4982 | |
889fca73 | 4983 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4984 | { |
6b754c8b | 4985 | struct io_buffer *kbuf; |
7a7cacba PB |
4986 | struct io_sr_msg *sr = &req->sr_msg; |
4987 | struct msghdr msg; | |
4988 | void __user *buf = sr->buf; | |
fddaface | 4989 | struct socket *sock; |
7a7cacba PB |
4990 | struct iovec iov; |
4991 | unsigned flags; | |
0031275d | 4992 | int min_ret = 0; |
bcda7baa | 4993 | int ret, cflags = 0; |
45d189c6 | 4994 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4995 | |
dba4a925 | 4996 | sock = sock_from_file(req->file); |
7a7cacba | 4997 | if (unlikely(!sock)) |
dba4a925 | 4998 | return -ENOTSOCK; |
fddaface | 4999 | |
bc02ef33 | 5000 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5001 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
5002 | if (IS_ERR(kbuf)) |
5003 | return PTR_ERR(kbuf); | |
7a7cacba | 5004 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5005 | } |
bcda7baa | 5006 | |
7a7cacba | 5007 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5008 | if (unlikely(ret)) |
5009 | goto out_free; | |
fddaface | 5010 | |
7a7cacba PB |
5011 | msg.msg_name = NULL; |
5012 | msg.msg_control = NULL; | |
5013 | msg.msg_controllen = 0; | |
5014 | msg.msg_namelen = 0; | |
5015 | msg.msg_iocb = NULL; | |
5016 | msg.msg_flags = 0; | |
fddaface | 5017 | |
04411806 PB |
5018 | flags = req->sr_msg.msg_flags; |
5019 | if (force_nonblock) | |
7a7cacba | 5020 | flags |= MSG_DONTWAIT; |
0031275d SM |
5021 | if (flags & MSG_WAITALL) |
5022 | min_ret = iov_iter_count(&msg.msg_iter); | |
5023 | ||
7a7cacba PB |
5024 | ret = sock_recvmsg(sock, &msg, flags); |
5025 | if (force_nonblock && ret == -EAGAIN) | |
5026 | return -EAGAIN; | |
5027 | if (ret == -ERESTARTSYS) | |
5028 | ret = -EINTR; | |
14c32eee | 5029 | out_free: |
7fbb1b54 PB |
5030 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5031 | cflags = io_put_recv_kbuf(req); | |
0031275d | 5032 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5033 | req_set_fail(req); |
889fca73 | 5034 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5035 | return 0; |
fddaface JA |
5036 | } |
5037 | ||
3529d8c2 | 5038 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5039 | { |
8ed8d3c3 JA |
5040 | struct io_accept *accept = &req->accept; |
5041 | ||
14587a46 | 5042 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5043 | return -EINVAL; |
aaa4db12 | 5044 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5045 | return -EINVAL; |
5046 | ||
d55e5f5b JA |
5047 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5048 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5049 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5050 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5051 | |
aaa4db12 PB |
5052 | accept->file_slot = READ_ONCE(sqe->file_index); |
5053 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5054 | (accept->flags & SOCK_CLOEXEC))) | |
5055 | return -EINVAL; | |
a7083ad5 PB |
5056 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5057 | return -EINVAL; | |
5058 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5059 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5060 | return 0; |
8ed8d3c3 | 5061 | } |
17f2fe35 | 5062 | |
889fca73 | 5063 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5064 | { |
5065 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5066 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5067 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5068 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5069 | struct file *file; |
5070 | int ret, fd; | |
8ed8d3c3 | 5071 | |
e697deed JX |
5072 | if (req->file->f_flags & O_NONBLOCK) |
5073 | req->flags |= REQ_F_NOWAIT; | |
5074 | ||
aaa4db12 PB |
5075 | if (!fixed) { |
5076 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5077 | if (unlikely(fd < 0)) | |
5078 | return fd; | |
5079 | } | |
a7083ad5 PB |
5080 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5081 | accept->flags); | |
5082 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5083 | if (!fixed) |
5084 | put_unused_fd(fd); | |
a7083ad5 PB |
5085 | ret = PTR_ERR(file); |
5086 | if (ret == -EAGAIN && force_nonblock) | |
5087 | return -EAGAIN; | |
ac45abc0 PB |
5088 | if (ret == -ERESTARTSYS) |
5089 | ret = -EINTR; | |
93d2bcd2 | 5090 | req_set_fail(req); |
aaa4db12 | 5091 | } else if (!fixed) { |
a7083ad5 PB |
5092 | fd_install(fd, file); |
5093 | ret = fd; | |
aaa4db12 PB |
5094 | } else { |
5095 | ret = io_install_fixed_file(req, file, issue_flags, | |
5096 | accept->file_slot - 1); | |
ac45abc0 | 5097 | } |
889fca73 | 5098 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5099 | return 0; |
8ed8d3c3 JA |
5100 | } |
5101 | ||
93642ef8 PB |
5102 | static int io_connect_prep_async(struct io_kiocb *req) |
5103 | { | |
5104 | struct io_async_connect *io = req->async_data; | |
5105 | struct io_connect *conn = &req->connect; | |
5106 | ||
5107 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5108 | } | |
5109 | ||
3529d8c2 | 5110 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5111 | { |
3529d8c2 | 5112 | struct io_connect *conn = &req->connect; |
f499a021 | 5113 | |
14587a46 | 5114 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5115 | return -EINVAL; |
26578cda PB |
5116 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5117 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5118 | return -EINVAL; |
5119 | ||
3529d8c2 JA |
5120 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5121 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5122 | return 0; |
f499a021 JA |
5123 | } |
5124 | ||
889fca73 | 5125 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5126 | { |
e8c2bc1f | 5127 | struct io_async_connect __io, *io; |
f8e85cf2 | 5128 | unsigned file_flags; |
3fbb51c1 | 5129 | int ret; |
45d189c6 | 5130 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5131 | |
e8c2bc1f JA |
5132 | if (req->async_data) { |
5133 | io = req->async_data; | |
f499a021 | 5134 | } else { |
3529d8c2 JA |
5135 | ret = move_addr_to_kernel(req->connect.addr, |
5136 | req->connect.addr_len, | |
e8c2bc1f | 5137 | &__io.address); |
f499a021 JA |
5138 | if (ret) |
5139 | goto out; | |
5140 | io = &__io; | |
5141 | } | |
5142 | ||
3fbb51c1 JA |
5143 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5144 | ||
e8c2bc1f | 5145 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5146 | req->connect.addr_len, file_flags); |
87f80d62 | 5147 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5148 | if (req->async_data) |
b7bb4f7d | 5149 | return -EAGAIN; |
e8c2bc1f | 5150 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5151 | ret = -ENOMEM; |
5152 | goto out; | |
5153 | } | |
e8c2bc1f | 5154 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5155 | return -EAGAIN; |
f499a021 | 5156 | } |
f8e85cf2 JA |
5157 | if (ret == -ERESTARTSYS) |
5158 | ret = -EINTR; | |
f499a021 | 5159 | out: |
4e88d6e7 | 5160 | if (ret < 0) |
93d2bcd2 | 5161 | req_set_fail(req); |
889fca73 | 5162 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5163 | return 0; |
469956e8 Y |
5164 | } |
5165 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5166 | #define IO_NETOP_FN(op) \ |
5167 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5168 | { \ | |
5169 | return -EOPNOTSUPP; \ | |
5170 | } | |
5171 | ||
5172 | #define IO_NETOP_PREP(op) \ | |
5173 | IO_NETOP_FN(op) \ | |
5174 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5175 | { \ | |
5176 | return -EOPNOTSUPP; \ | |
5177 | } \ | |
5178 | ||
5179 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5180 | IO_NETOP_PREP(op) \ | |
5181 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5182 | { \ | |
5183 | return -EOPNOTSUPP; \ | |
5184 | } | |
5185 | ||
5186 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5187 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5188 | IO_NETOP_PREP_ASYNC(connect); | |
5189 | IO_NETOP_PREP(accept); | |
5190 | IO_NETOP_FN(send); | |
5191 | IO_NETOP_FN(recv); | |
469956e8 | 5192 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5193 | |
d7718a9d JA |
5194 | struct io_poll_table { |
5195 | struct poll_table_struct pt; | |
5196 | struct io_kiocb *req; | |
68b11e8b | 5197 | int nr_entries; |
d7718a9d JA |
5198 | int error; |
5199 | }; | |
ce593a6c | 5200 | |
d7718a9d | 5201 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5202 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5203 | { |
d7718a9d JA |
5204 | /* for instances that support it check for an event match first: */ |
5205 | if (mask && !(mask & poll->events)) | |
5206 | return 0; | |
5207 | ||
5208 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5209 | ||
5210 | list_del_init(&poll->wait.entry); | |
5211 | ||
d7718a9d | 5212 | req->result = mask; |
5b0a6acc | 5213 | req->io_task_work.func = func; |
6d816e08 | 5214 | |
d7718a9d | 5215 | /* |
e3aabf95 JA |
5216 | * If this fails, then the task is exiting. When a task exits, the |
5217 | * work gets canceled, so just cancel this request as well instead | |
5218 | * of executing it. We can't safely execute it anyway, as we may not | |
5219 | * have the needed state needed for it anyway. | |
d7718a9d | 5220 | */ |
e09ee510 | 5221 | io_req_task_work_add(req); |
d7718a9d JA |
5222 | return 1; |
5223 | } | |
5224 | ||
74ce6ce4 JA |
5225 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5226 | __acquires(&req->ctx->completion_lock) | |
5227 | { | |
5228 | struct io_ring_ctx *ctx = req->ctx; | |
5229 | ||
316319e8 | 5230 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5231 | if (unlikely(req->task->flags & PF_EXITING)) |
5232 | WRITE_ONCE(poll->canceled, true); | |
5233 | ||
74ce6ce4 JA |
5234 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5235 | struct poll_table_struct pt = { ._key = poll->events }; | |
5236 | ||
5237 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5238 | } | |
5239 | ||
79ebeaee | 5240 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5241 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5242 | add_wait_queue(poll->head, &poll->wait); | |
5243 | return true; | |
5244 | } | |
5245 | ||
5246 | return false; | |
5247 | } | |
5248 | ||
d4e7cd36 | 5249 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5250 | { |
e8c2bc1f | 5251 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5252 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5253 | return req->async_data; |
d4e7cd36 JA |
5254 | return req->apoll->double_poll; |
5255 | } | |
5256 | ||
5257 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5258 | { | |
5259 | if (req->opcode == IORING_OP_POLL_ADD) | |
5260 | return &req->poll; | |
5261 | return &req->apoll->poll; | |
5262 | } | |
5263 | ||
5264 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5265 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5266 | { |
5267 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5268 | |
5269 | lockdep_assert_held(&req->ctx->completion_lock); | |
5270 | ||
5271 | if (poll && poll->head) { | |
5272 | struct wait_queue_head *head = poll->head; | |
5273 | ||
79ebeaee | 5274 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5275 | list_del_init(&poll->wait.entry); |
5276 | if (poll->wait.private) | |
de9b4cca | 5277 | req_ref_put(req); |
18bceab1 | 5278 | poll->head = NULL; |
79ebeaee | 5279 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5280 | } |
5281 | } | |
5282 | ||
31efe48e | 5283 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5284 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5285 | { |
5286 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5287 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5288 | int error; |
18bceab1 | 5289 | |
e27414be | 5290 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5291 | error = -ECANCELED; |
88e41cf9 | 5292 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5293 | } else { |
5082620f | 5294 | error = mangle_poll(mask); |
e27414be | 5295 | } |
b69de288 JA |
5296 | if (req->poll.events & EPOLLONESHOT) |
5297 | flags = 0; | |
d4d19c19 | 5298 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
88e41cf9 JA |
5299 | req->poll.done = true; |
5300 | flags = 0; | |
5301 | } | |
7b289c38 HX |
5302 | if (flags & IORING_CQE_F_MORE) |
5303 | ctx->cq_extra++; | |
18bceab1 | 5304 | |
88e41cf9 | 5305 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5306 | } |
5307 | ||
31efe48e XW |
5308 | static inline bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
5309 | __must_hold(&req->ctx->completion_lock) | |
5310 | { | |
5311 | bool done; | |
5312 | ||
5313 | done = __io_poll_complete(req, mask); | |
5314 | io_commit_cqring(req->ctx); | |
5315 | return done; | |
5316 | } | |
5317 | ||
f237c30a | 5318 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5319 | { |
5320 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5321 | struct io_kiocb *nxt; |
18bceab1 JA |
5322 | |
5323 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5324 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5325 | } else { |
f40b964a | 5326 | bool done; |
18bceab1 | 5327 | |
31efe48e | 5328 | done = __io_poll_complete(req, req->result); |
88e41cf9 | 5329 | if (done) { |
a890d01e | 5330 | io_poll_remove_double(req); |
88e41cf9 | 5331 | hash_del(&req->hash_node); |
f40b964a | 5332 | } else { |
88e41cf9 JA |
5333 | req->result = 0; |
5334 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5335 | } | |
31efe48e | 5336 | io_commit_cqring(ctx); |
79ebeaee | 5337 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5338 | io_cqring_ev_posted(ctx); |
18bceab1 | 5339 | |
88e41cf9 JA |
5340 | if (done) { |
5341 | nxt = io_put_req_find_next(req); | |
5342 | if (nxt) | |
f237c30a | 5343 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5344 | } |
dd221f46 | 5345 | } |
18bceab1 JA |
5346 | } |
5347 | ||
5348 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5349 | int sync, void *key) | |
5350 | { | |
5351 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5352 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5353 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5354 | unsigned long flags; |
18bceab1 JA |
5355 | |
5356 | /* for instances that support it check for an event match first: */ | |
5357 | if (mask && !(mask & poll->events)) | |
5358 | return 0; | |
88e41cf9 JA |
5359 | if (!(poll->events & EPOLLONESHOT)) |
5360 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5361 | |
8706e04e JA |
5362 | list_del_init(&wait->entry); |
5363 | ||
9ce85ef2 | 5364 | if (poll->head) { |
18bceab1 JA |
5365 | bool done; |
5366 | ||
79ebeaee | 5367 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5368 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5369 | if (!done) |
807abcb0 | 5370 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5371 | /* make sure double remove sees this as being gone */ |
5372 | wait->private = NULL; | |
79ebeaee | 5373 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5374 | if (!done) { |
5375 | /* use wait func handler, so it matches the rq type */ | |
5376 | poll->wait.func(&poll->wait, mode, sync, key); | |
5377 | } | |
18bceab1 | 5378 | } |
de9b4cca | 5379 | req_ref_put(req); |
18bceab1 JA |
5380 | return 1; |
5381 | } | |
5382 | ||
5383 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5384 | wait_queue_func_t wake_func) | |
5385 | { | |
5386 | poll->head = NULL; | |
5387 | poll->done = false; | |
5388 | poll->canceled = false; | |
464dca61 JA |
5389 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5390 | /* mask in events that we always want/need */ | |
5391 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5392 | INIT_LIST_HEAD(&poll->wait.entry); |
5393 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5394 | } | |
5395 | ||
5396 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5397 | struct wait_queue_head *head, |
5398 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5399 | { |
5400 | struct io_kiocb *req = pt->req; | |
5401 | ||
5402 | /* | |
68b11e8b PB |
5403 | * The file being polled uses multiple waitqueues for poll handling |
5404 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5405 | * if this happens. | |
18bceab1 | 5406 | */ |
68b11e8b | 5407 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5408 | struct io_poll_iocb *poll_one = poll; |
5409 | ||
23a65db8 PB |
5410 | /* double add on the same waitqueue head, ignore */ |
5411 | if (poll_one->head == head) | |
5412 | return; | |
18bceab1 | 5413 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5414 | if (*poll_ptr) { |
23a65db8 PB |
5415 | if ((*poll_ptr)->head == head) |
5416 | return; | |
18bceab1 JA |
5417 | pt->error = -EINVAL; |
5418 | return; | |
5419 | } | |
ea6a693d JA |
5420 | /* |
5421 | * Can't handle multishot for double wait for now, turn it | |
5422 | * into one-shot mode. | |
5423 | */ | |
7a274727 PB |
5424 | if (!(poll_one->events & EPOLLONESHOT)) |
5425 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5426 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5427 | if (!poll) { | |
5428 | pt->error = -ENOMEM; | |
5429 | return; | |
5430 | } | |
58852d4d | 5431 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5432 | req_ref_get(req); |
18bceab1 | 5433 | poll->wait.private = req; |
807abcb0 | 5434 | *poll_ptr = poll; |
18bceab1 JA |
5435 | } |
5436 | ||
68b11e8b | 5437 | pt->nr_entries++; |
18bceab1 | 5438 | poll->head = head; |
a31eb4a2 JX |
5439 | |
5440 | if (poll->events & EPOLLEXCLUSIVE) | |
5441 | add_wait_queue_exclusive(head, &poll->wait); | |
5442 | else | |
5443 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5444 | } |
5445 | ||
5446 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5447 | struct poll_table_struct *p) | |
5448 | { | |
5449 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5450 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5451 | |
807abcb0 | 5452 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5453 | } |
5454 | ||
f237c30a | 5455 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5456 | { |
d7718a9d JA |
5457 | struct async_poll *apoll = req->apoll; |
5458 | struct io_ring_ctx *ctx = req->ctx; | |
5459 | ||
236daeae | 5460 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5461 | |
74ce6ce4 | 5462 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5463 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5464 | return; |
d7718a9d JA |
5465 | } |
5466 | ||
0ea13b44 | 5467 | hash_del(&req->hash_node); |
d4e7cd36 | 5468 | io_poll_remove_double(req); |
79ebeaee | 5469 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5470 | |
0be0b0e3 | 5471 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5472 | io_req_task_submit(req, locked); |
0be0b0e3 | 5473 | else |
2593553a | 5474 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5475 | } |
5476 | ||
5477 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5478 | void *key) | |
5479 | { | |
5480 | struct io_kiocb *req = wait->private; | |
5481 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5482 | ||
5483 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5484 | key_to_poll(key)); | |
5485 | ||
5486 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5487 | } | |
5488 | ||
5489 | static void io_poll_req_insert(struct io_kiocb *req) | |
5490 | { | |
5491 | struct io_ring_ctx *ctx = req->ctx; | |
5492 | struct hlist_head *list; | |
5493 | ||
5494 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5495 | hlist_add_head(&req->hash_node, list); | |
5496 | } | |
5497 | ||
5498 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5499 | struct io_poll_iocb *poll, | |
5500 | struct io_poll_table *ipt, __poll_t mask, | |
5501 | wait_queue_func_t wake_func) | |
5502 | __acquires(&ctx->completion_lock) | |
5503 | { | |
5504 | struct io_ring_ctx *ctx = req->ctx; | |
5505 | bool cancel = false; | |
5506 | ||
4d52f338 | 5507 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5508 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5509 | poll->file = req->file; |
18bceab1 | 5510 | poll->wait.private = req; |
d7718a9d JA |
5511 | |
5512 | ipt->pt._key = mask; | |
5513 | ipt->req = req; | |
68b11e8b PB |
5514 | ipt->error = 0; |
5515 | ipt->nr_entries = 0; | |
d7718a9d | 5516 | |
d7718a9d | 5517 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5518 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5519 | ipt->error = -EINVAL; | |
d7718a9d | 5520 | |
79ebeaee | 5521 | spin_lock(&ctx->completion_lock); |
a890d01e | 5522 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5523 | io_poll_remove_double(req); |
d7718a9d | 5524 | if (likely(poll->head)) { |
79ebeaee | 5525 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5526 | if (unlikely(list_empty(&poll->wait.entry))) { |
5527 | if (ipt->error) | |
5528 | cancel = true; | |
5529 | ipt->error = 0; | |
5530 | mask = 0; | |
5531 | } | |
88e41cf9 | 5532 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5533 | list_del_init(&poll->wait.entry); |
5534 | else if (cancel) | |
5535 | WRITE_ONCE(poll->canceled, true); | |
5536 | else if (!poll->done) /* actually waiting for an event */ | |
5537 | io_poll_req_insert(req); | |
79ebeaee | 5538 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5539 | } |
5540 | ||
5541 | return mask; | |
5542 | } | |
5543 | ||
59b735ae OL |
5544 | enum { |
5545 | IO_APOLL_OK, | |
5546 | IO_APOLL_ABORTED, | |
5547 | IO_APOLL_READY | |
5548 | }; | |
5549 | ||
5550 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5551 | { |
5552 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5553 | struct io_ring_ctx *ctx = req->ctx; | |
5554 | struct async_poll *apoll; | |
5555 | struct io_poll_table ipt; | |
b2d9c3da | 5556 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5557 | int rw; |
d7718a9d JA |
5558 | |
5559 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5560 | return IO_APOLL_ABORTED; |
24c74678 | 5561 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5562 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5563 | if (!def->pollin && !def->pollout) |
5564 | return IO_APOLL_ABORTED; | |
5565 | ||
5566 | if (def->pollin) { | |
9dab14b8 | 5567 | rw = READ; |
b2d9c3da PB |
5568 | mask |= POLLIN | POLLRDNORM; |
5569 | ||
5570 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5571 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5572 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5573 | mask &= ~POLLIN; | |
5574 | } else { | |
9dab14b8 | 5575 | rw = WRITE; |
b2d9c3da PB |
5576 | mask |= POLLOUT | POLLWRNORM; |
5577 | } | |
5578 | ||
9dab14b8 | 5579 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5580 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5581 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5582 | |
5583 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5584 | if (unlikely(!apoll)) | |
59b735ae | 5585 | return IO_APOLL_ABORTED; |
807abcb0 | 5586 | apoll->double_poll = NULL; |
d7718a9d | 5587 | req->apoll = apoll; |
b2d9c3da | 5588 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5589 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5590 | io_req_set_refcount(req); |
d7718a9d JA |
5591 | |
5592 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5593 | io_async_wake); | |
79ebeaee | 5594 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5595 | if (ret || ipt.error) |
5596 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5597 | ||
236daeae OL |
5598 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5599 | mask, apoll->poll.events); | |
59b735ae | 5600 | return IO_APOLL_OK; |
d7718a9d JA |
5601 | } |
5602 | ||
5603 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5604 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5605 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5606 | { |
b41e9852 | 5607 | bool do_complete = false; |
221c5eb2 | 5608 | |
5082620f JA |
5609 | if (!poll->head) |
5610 | return false; | |
79ebeaee | 5611 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5612 | if (do_cancel) |
5613 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5614 | if (!list_empty(&poll->wait.entry)) { |
5615 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5616 | do_complete = true; |
221c5eb2 | 5617 | } |
79ebeaee | 5618 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5619 | hash_del(&req->hash_node); |
d7718a9d JA |
5620 | return do_complete; |
5621 | } | |
5622 | ||
5d709043 | 5623 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5624 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5625 | { |
5626 | bool do_complete; | |
5627 | ||
d4e7cd36 | 5628 | io_poll_remove_double(req); |
e31001a3 | 5629 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5630 | |
b41e9852 | 5631 | if (do_complete) { |
d4d19c19 | 5632 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5633 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5634 | req_set_fail(req); |
91c2f697 | 5635 | io_put_req_deferred(req); |
5d709043 | 5636 | } |
b41e9852 | 5637 | return do_complete; |
221c5eb2 JA |
5638 | } |
5639 | ||
76e1b642 JA |
5640 | /* |
5641 | * Returns true if we found and killed one or more poll requests | |
5642 | */ | |
6b81928d | 5643 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5644 | bool cancel_all) |
221c5eb2 | 5645 | { |
78076bb6 | 5646 | struct hlist_node *tmp; |
221c5eb2 | 5647 | struct io_kiocb *req; |
8e2e1faf | 5648 | int posted = 0, i; |
221c5eb2 | 5649 | |
79ebeaee | 5650 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5651 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5652 | struct hlist_head *list; | |
5653 | ||
5654 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5655 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5656 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5657 | posted += io_poll_remove_one(req); |
5658 | } | |
221c5eb2 | 5659 | } |
79ebeaee | 5660 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5661 | |
8e2e1faf JA |
5662 | if (posted) |
5663 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5664 | |
5665 | return posted != 0; | |
221c5eb2 JA |
5666 | } |
5667 | ||
9ba5fac8 PB |
5668 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5669 | bool poll_only) | |
e07785b0 | 5670 | __must_hold(&ctx->completion_lock) |
47f46768 | 5671 | { |
78076bb6 | 5672 | struct hlist_head *list; |
47f46768 JA |
5673 | struct io_kiocb *req; |
5674 | ||
78076bb6 JA |
5675 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5676 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5677 | if (sqe_addr != req->user_data) |
5678 | continue; | |
9ba5fac8 PB |
5679 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5680 | continue; | |
b2cb805f | 5681 | return req; |
47f46768 | 5682 | } |
b2cb805f JA |
5683 | return NULL; |
5684 | } | |
5685 | ||
9ba5fac8 PB |
5686 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5687 | bool poll_only) | |
e07785b0 | 5688 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5689 | { |
5690 | struct io_kiocb *req; | |
5691 | ||
9ba5fac8 | 5692 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5693 | if (!req) |
5694 | return -ENOENT; | |
5695 | if (io_poll_remove_one(req)) | |
5696 | return 0; | |
5697 | ||
5698 | return -EALREADY; | |
47f46768 JA |
5699 | } |
5700 | ||
9096af3e PB |
5701 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5702 | unsigned int flags) | |
5703 | { | |
5704 | u32 events; | |
47f46768 | 5705 | |
9096af3e PB |
5706 | events = READ_ONCE(sqe->poll32_events); |
5707 | #ifdef __BIG_ENDIAN | |
5708 | events = swahw32(events); | |
5709 | #endif | |
5710 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5711 | events |= EPOLLONESHOT; | |
5712 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5713 | } |
5714 | ||
c5de0036 | 5715 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5716 | const struct io_uring_sqe *sqe) |
0969e783 | 5717 | { |
c5de0036 PB |
5718 | struct io_poll_update *upd = &req->poll_update; |
5719 | u32 flags; | |
5720 | ||
0969e783 JA |
5721 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5722 | return -EINVAL; | |
26578cda | 5723 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5724 | return -EINVAL; |
5725 | flags = READ_ONCE(sqe->len); | |
5726 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5727 | IORING_POLL_ADD_MULTI)) | |
5728 | return -EINVAL; | |
5729 | /* meaningless without update */ | |
5730 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5731 | return -EINVAL; |
5732 | ||
c5de0036 PB |
5733 | upd->old_user_data = READ_ONCE(sqe->addr); |
5734 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5735 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5736 | |
c5de0036 PB |
5737 | upd->new_user_data = READ_ONCE(sqe->off); |
5738 | if (!upd->update_user_data && upd->new_user_data) | |
5739 | return -EINVAL; | |
5740 | if (upd->update_events) | |
5741 | upd->events = io_poll_parse_events(sqe, flags); | |
5742 | else if (sqe->poll32_events) | |
5743 | return -EINVAL; | |
221c5eb2 | 5744 | |
221c5eb2 JA |
5745 | return 0; |
5746 | } | |
5747 | ||
221c5eb2 JA |
5748 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5749 | void *key) | |
5750 | { | |
c2f2eb7d JA |
5751 | struct io_kiocb *req = wait->private; |
5752 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5753 | |
d7718a9d | 5754 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5755 | } |
5756 | ||
221c5eb2 JA |
5757 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5758 | struct poll_table_struct *p) | |
5759 | { | |
5760 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5761 | ||
e8c2bc1f | 5762 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5763 | } |
5764 | ||
3529d8c2 | 5765 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5766 | { |
5767 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5768 | u32 flags; |
221c5eb2 JA |
5769 | |
5770 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5771 | return -EINVAL; | |
c5de0036 | 5772 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5773 | return -EINVAL; |
5774 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5775 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5776 | return -EINVAL; |
5777 | ||
48dcd38d | 5778 | io_req_set_refcount(req); |
c5de0036 | 5779 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5780 | return 0; |
5781 | } | |
5782 | ||
61e98203 | 5783 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5784 | { |
5785 | struct io_poll_iocb *poll = &req->poll; | |
5786 | struct io_ring_ctx *ctx = req->ctx; | |
5787 | struct io_poll_table ipt; | |
0969e783 | 5788 | __poll_t mask; |
0969e783 | 5789 | |
d7718a9d | 5790 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5791 | |
d7718a9d JA |
5792 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5793 | io_poll_wake); | |
221c5eb2 | 5794 | |
8c838788 | 5795 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5796 | ipt.error = 0; |
e27414be | 5797 | io_poll_complete(req, mask); |
221c5eb2 | 5798 | } |
79ebeaee | 5799 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5800 | |
8c838788 JA |
5801 | if (mask) { |
5802 | io_cqring_ev_posted(ctx); | |
88e41cf9 JA |
5803 | if (poll->events & EPOLLONESHOT) |
5804 | io_put_req(req); | |
221c5eb2 | 5805 | } |
8c838788 | 5806 | return ipt.error; |
221c5eb2 JA |
5807 | } |
5808 | ||
c5de0036 | 5809 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5810 | { |
5811 | struct io_ring_ctx *ctx = req->ctx; | |
5812 | struct io_kiocb *preq; | |
cb3b200e | 5813 | bool completing; |
b69de288 JA |
5814 | int ret; |
5815 | ||
79ebeaee | 5816 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5817 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5818 | if (!preq) { |
5819 | ret = -ENOENT; | |
5820 | goto err; | |
b69de288 | 5821 | } |
cb3b200e | 5822 | |
c5de0036 PB |
5823 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5824 | completing = true; | |
5825 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5826 | goto err; | |
5827 | } | |
5828 | ||
cb3b200e JA |
5829 | /* |
5830 | * Don't allow racy completion with singleshot, as we cannot safely | |
5831 | * update those. For multishot, if we're racing with completion, just | |
5832 | * let completion re-add it. | |
5833 | */ | |
5834 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5835 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5836 | ret = -EALREADY; | |
5837 | goto err; | |
b69de288 JA |
5838 | } |
5839 | /* we now have a detached poll request. reissue. */ | |
5840 | ret = 0; | |
5841 | err: | |
b69de288 | 5842 | if (ret < 0) { |
79ebeaee | 5843 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5844 | req_set_fail(req); |
b69de288 JA |
5845 | io_req_complete(req, ret); |
5846 | return 0; | |
5847 | } | |
5848 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5849 | if (req->poll_update.update_events) { |
b69de288 | 5850 | preq->poll.events &= ~0xffff; |
9d805892 | 5851 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5852 | preq->poll.events |= IO_POLL_UNMASK; |
5853 | } | |
9d805892 PB |
5854 | if (req->poll_update.update_user_data) |
5855 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5856 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5857 | |
b69de288 JA |
5858 | /* complete update request, we're done with it */ |
5859 | io_req_complete(req, ret); | |
5860 | ||
cb3b200e | 5861 | if (!completing) { |
c5de0036 | 5862 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5863 | if (ret < 0) { |
93d2bcd2 | 5864 | req_set_fail(preq); |
cb3b200e JA |
5865 | io_req_complete(preq, ret); |
5866 | } | |
b69de288 JA |
5867 | } |
5868 | return 0; | |
5869 | } | |
5870 | ||
f237c30a | 5871 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5872 | { |
89850fce | 5873 | req_set_fail(req); |
505657bc | 5874 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5875 | } |
5876 | ||
5262f567 JA |
5877 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5878 | { | |
ad8a48ac JA |
5879 | struct io_timeout_data *data = container_of(timer, |
5880 | struct io_timeout_data, timer); | |
5881 | struct io_kiocb *req = data->req; | |
5882 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5883 | unsigned long flags; |
5884 | ||
89850fce | 5885 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5886 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5887 | atomic_set(&req->ctx->cq_timeouts, |
5888 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5889 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5890 | |
89850fce JA |
5891 | req->io_task_work.func = io_req_task_timeout; |
5892 | io_req_task_work_add(req); | |
5262f567 JA |
5893 | return HRTIMER_NORESTART; |
5894 | } | |
5895 | ||
fbd15848 PB |
5896 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5897 | __u64 user_data) | |
89850fce | 5898 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5899 | { |
fbd15848 | 5900 | struct io_timeout_data *io; |
47f46768 | 5901 | struct io_kiocb *req; |
fd9c7bc5 | 5902 | bool found = false; |
f254ac04 | 5903 | |
135fcde8 | 5904 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5905 | found = user_data == req->user_data; |
5906 | if (found) | |
47f46768 | 5907 | break; |
47f46768 | 5908 | } |
fd9c7bc5 PB |
5909 | if (!found) |
5910 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5911 | |
5912 | io = req->async_data; | |
fd9c7bc5 | 5913 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5914 | return ERR_PTR(-EALREADY); |
a71976f3 | 5915 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5916 | return req; |
5917 | } | |
47f46768 | 5918 | |
fbd15848 | 5919 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5920 | __must_hold(&ctx->completion_lock) |
89850fce | 5921 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5922 | { |
5923 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5924 | ||
5925 | if (IS_ERR(req)) | |
5926 | return PTR_ERR(req); | |
f254ac04 | 5927 | |
93d2bcd2 | 5928 | req_set_fail(req); |
d4d19c19 | 5929 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 5930 | io_put_req_deferred(req); |
f254ac04 JA |
5931 | return 0; |
5932 | } | |
5933 | ||
50c1df2b JA |
5934 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5935 | { | |
5936 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5937 | case IORING_TIMEOUT_BOOTTIME: | |
5938 | return CLOCK_BOOTTIME; | |
5939 | case IORING_TIMEOUT_REALTIME: | |
5940 | return CLOCK_REALTIME; | |
5941 | default: | |
5942 | /* can't happen, vetted at prep time */ | |
5943 | WARN_ON_ONCE(1); | |
5944 | fallthrough; | |
5945 | case 0: | |
5946 | return CLOCK_MONOTONIC; | |
5947 | } | |
5948 | } | |
5949 | ||
f1042b6c PB |
5950 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5951 | struct timespec64 *ts, enum hrtimer_mode mode) | |
5952 | __must_hold(&ctx->timeout_lock) | |
5953 | { | |
5954 | struct io_timeout_data *io; | |
5955 | struct io_kiocb *req; | |
5956 | bool found = false; | |
5957 | ||
5958 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
5959 | found = user_data == req->user_data; | |
5960 | if (found) | |
5961 | break; | |
5962 | } | |
5963 | if (!found) | |
5964 | return -ENOENT; | |
5965 | ||
5966 | io = req->async_data; | |
5967 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
5968 | return -EALREADY; | |
5969 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
5970 | io->timer.function = io_link_timeout_fn; | |
5971 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
5972 | return 0; | |
5973 | } | |
5974 | ||
9c8e11b3 PB |
5975 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5976 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 5977 | __must_hold(&ctx->timeout_lock) |
47f46768 | 5978 | { |
9c8e11b3 PB |
5979 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5980 | struct io_timeout_data *data; | |
47f46768 | 5981 | |
9c8e11b3 PB |
5982 | if (IS_ERR(req)) |
5983 | return PTR_ERR(req); | |
47f46768 | 5984 | |
9c8e11b3 PB |
5985 | req->timeout.off = 0; /* noseq */ |
5986 | data = req->async_data; | |
5987 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 5988 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
5989 | data->timer.function = io_timeout_fn; |
5990 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5991 | return 0; | |
47f46768 JA |
5992 | } |
5993 | ||
3529d8c2 JA |
5994 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5995 | const struct io_uring_sqe *sqe) | |
b29472ee | 5996 | { |
9c8e11b3 PB |
5997 | struct io_timeout_rem *tr = &req->timeout_rem; |
5998 | ||
b29472ee JA |
5999 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6000 | return -EINVAL; | |
61710e43 DA |
6001 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6002 | return -EINVAL; | |
26578cda | 6003 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6004 | return -EINVAL; |
6005 | ||
f1042b6c | 6006 | tr->ltimeout = false; |
9c8e11b3 PB |
6007 | tr->addr = READ_ONCE(sqe->addr); |
6008 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6009 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6010 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6011 | return -EINVAL; | |
6012 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6013 | tr->ltimeout = true; | |
6014 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6015 | return -EINVAL; |
6016 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6017 | return -EFAULT; | |
6018 | } else if (tr->flags) { | |
6019 | /* timeout removal doesn't support flags */ | |
b29472ee | 6020 | return -EINVAL; |
9c8e11b3 | 6021 | } |
b29472ee | 6022 | |
b29472ee JA |
6023 | return 0; |
6024 | } | |
6025 | ||
8662daec PB |
6026 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6027 | { | |
6028 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6029 | : HRTIMER_MODE_REL; | |
6030 | } | |
6031 | ||
11365043 JA |
6032 | /* |
6033 | * Remove or update an existing timeout command | |
6034 | */ | |
61e98203 | 6035 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6036 | { |
9c8e11b3 | 6037 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6038 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6039 | int ret; |
11365043 | 6040 | |
ec3c3d0f PB |
6041 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6042 | spin_lock(&ctx->completion_lock); | |
6043 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6044 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6045 | spin_unlock_irq(&ctx->timeout_lock); |
6046 | spin_unlock(&ctx->completion_lock); | |
6047 | } else { | |
f1042b6c PB |
6048 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6049 | ||
ec3c3d0f | 6050 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6051 | if (tr->ltimeout) |
6052 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6053 | else | |
6054 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6055 | spin_unlock_irq(&ctx->timeout_lock); |
6056 | } | |
11365043 | 6057 | |
4e88d6e7 | 6058 | if (ret < 0) |
93d2bcd2 | 6059 | req_set_fail(req); |
505657bc | 6060 | io_req_complete_post(req, ret, 0); |
11365043 | 6061 | return 0; |
5262f567 JA |
6062 | } |
6063 | ||
3529d8c2 | 6064 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6065 | bool is_timeout_link) |
5262f567 | 6066 | { |
ad8a48ac | 6067 | struct io_timeout_data *data; |
a41525ab | 6068 | unsigned flags; |
56080b02 | 6069 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6070 | |
ad8a48ac | 6071 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6072 | return -EINVAL; |
26578cda PB |
6073 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6074 | sqe->splice_fd_in) | |
a41525ab | 6075 | return -EINVAL; |
56080b02 | 6076 | if (off && is_timeout_link) |
2d28390a | 6077 | return -EINVAL; |
a41525ab | 6078 | flags = READ_ONCE(sqe->timeout_flags); |
50c1df2b JA |
6079 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) |
6080 | return -EINVAL; | |
6081 | /* more than one clock specified is invalid, obviously */ | |
6082 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6083 | return -EINVAL; |
bdf20073 | 6084 | |
ef9dd637 | 6085 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6086 | req->timeout.off = off; |
f18ee4cf PB |
6087 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6088 | req->ctx->off_timeout_used = true; | |
26a61679 | 6089 | |
e8c2bc1f | 6090 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
6091 | return -ENOMEM; |
6092 | ||
e8c2bc1f | 6093 | data = req->async_data; |
ad8a48ac | 6094 | data->req = req; |
50c1df2b | 6095 | data->flags = flags; |
ad8a48ac JA |
6096 | |
6097 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6098 | return -EFAULT; |
6099 | ||
8662daec | 6100 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6101 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6102 | |
6103 | if (is_timeout_link) { | |
6104 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6105 | ||
6106 | if (!link->head) | |
6107 | return -EINVAL; | |
6108 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6109 | return -EINVAL; | |
4d13d1a4 PB |
6110 | req->timeout.head = link->last; |
6111 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6112 | } |
ad8a48ac JA |
6113 | return 0; |
6114 | } | |
6115 | ||
61e98203 | 6116 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6117 | { |
ad8a48ac | 6118 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6119 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6120 | struct list_head *entry; |
bfe68a22 | 6121 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6122 | |
89850fce | 6123 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6124 | |
5262f567 JA |
6125 | /* |
6126 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6127 | * timeout event to be satisfied. If it isn't set, then this is |
6128 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6129 | */ |
8eb7e2d0 | 6130 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6131 | entry = ctx->timeout_list.prev; |
6132 | goto add; | |
6133 | } | |
5262f567 | 6134 | |
bfe68a22 PB |
6135 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6136 | req->timeout.target_seq = tail + off; | |
5262f567 | 6137 | |
f010505b MDG |
6138 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6139 | * This is safe because ->completion_lock is held, and submissions | |
6140 | * and completions are never mixed in the same ->completion_lock section. | |
6141 | */ | |
6142 | ctx->cq_last_tm_flush = tail; | |
6143 | ||
5262f567 JA |
6144 | /* |
6145 | * Insertion sort, ensuring the first entry in the list is always | |
6146 | * the one we need first. | |
6147 | */ | |
5262f567 | 6148 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6149 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6150 | timeout.list); | |
5262f567 | 6151 | |
8eb7e2d0 | 6152 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6153 | continue; |
bfe68a22 PB |
6154 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6155 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6156 | break; |
6157 | } | |
93bd25bb | 6158 | add: |
135fcde8 | 6159 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6160 | data->timer.function = io_timeout_fn; |
6161 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6162 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6163 | return 0; |
6164 | } | |
5262f567 | 6165 | |
f458dd84 PB |
6166 | struct io_cancel_data { |
6167 | struct io_ring_ctx *ctx; | |
6168 | u64 user_data; | |
6169 | }; | |
6170 | ||
62755e35 JA |
6171 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6172 | { | |
6173 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6174 | struct io_cancel_data *cd = data; |
62755e35 | 6175 | |
f458dd84 | 6176 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6177 | } |
6178 | ||
f458dd84 PB |
6179 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6180 | struct io_ring_ctx *ctx) | |
62755e35 | 6181 | { |
f458dd84 | 6182 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6183 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6184 | int ret = 0; |
6185 | ||
f458dd84 | 6186 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6187 | return -ENOENT; |
6188 | ||
f458dd84 | 6189 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6190 | switch (cancel_ret) { |
6191 | case IO_WQ_CANCEL_OK: | |
6192 | ret = 0; | |
6193 | break; | |
6194 | case IO_WQ_CANCEL_RUNNING: | |
6195 | ret = -EALREADY; | |
6196 | break; | |
6197 | case IO_WQ_CANCEL_NOTFOUND: | |
6198 | ret = -ENOENT; | |
6199 | break; | |
6200 | } | |
6201 | ||
e977d6d3 JA |
6202 | return ret; |
6203 | } | |
6204 | ||
8cb01fac | 6205 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6206 | { |
8cb01fac | 6207 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6208 | int ret; |
6209 | ||
dadebc35 | 6210 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6211 | |
f458dd84 | 6212 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6213 | if (ret != -ENOENT) |
8cb01fac | 6214 | return ret; |
505657bc PB |
6215 | |
6216 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6217 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6218 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6219 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6220 | if (ret != -ENOENT) |
505657bc PB |
6221 | goto out; |
6222 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6223 | out: | |
6224 | spin_unlock(&ctx->completion_lock); | |
6225 | return ret; | |
47f46768 JA |
6226 | } |
6227 | ||
3529d8c2 JA |
6228 | static int io_async_cancel_prep(struct io_kiocb *req, |
6229 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6230 | { |
fbf23849 | 6231 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6232 | return -EINVAL; |
61710e43 DA |
6233 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6234 | return -EINVAL; | |
26578cda PB |
6235 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6236 | sqe->splice_fd_in) | |
e977d6d3 JA |
6237 | return -EINVAL; |
6238 | ||
fbf23849 JA |
6239 | req->cancel.addr = READ_ONCE(sqe->addr); |
6240 | return 0; | |
6241 | } | |
6242 | ||
61e98203 | 6243 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6244 | { |
6245 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6246 | u64 sqe_addr = req->cancel.addr; |
6247 | struct io_tctx_node *node; | |
6248 | int ret; | |
6249 | ||
8cb01fac | 6250 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6251 | if (ret != -ENOENT) |
6252 | goto done; | |
58f99373 PB |
6253 | |
6254 | /* slow path, try all io-wq's */ | |
6255 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
6256 | ret = -ENOENT; | |
6257 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6258 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6259 | |
58f99373 PB |
6260 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6261 | if (ret != -ENOENT) | |
6262 | break; | |
6263 | } | |
6264 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
58f99373 | 6265 | done: |
58f99373 | 6266 | if (ret < 0) |
93d2bcd2 | 6267 | req_set_fail(req); |
505657bc | 6268 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6269 | return 0; |
6270 | } | |
6271 | ||
269bbe5f | 6272 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6273 | const struct io_uring_sqe *sqe) |
6274 | { | |
61710e43 DA |
6275 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6276 | return -EINVAL; | |
26578cda | 6277 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6278 | return -EINVAL; |
6279 | ||
269bbe5f BM |
6280 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6281 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6282 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6283 | return -EINVAL; |
269bbe5f | 6284 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6285 | return 0; |
6286 | } | |
6287 | ||
889fca73 | 6288 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6289 | { |
6290 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6291 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6292 | int ret; |
fbf23849 | 6293 | |
45d189c6 | 6294 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 6295 | return -EAGAIN; |
05f3fb3c | 6296 | |
269bbe5f BM |
6297 | up.offset = req->rsrc_update.offset; |
6298 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6299 | up.nr = 0; |
6300 | up.tags = 0; | |
615cee49 | 6301 | up.resv = 0; |
05f3fb3c JA |
6302 | |
6303 | mutex_lock(&ctx->uring_lock); | |
fdecb662 | 6304 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6305 | &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
6306 | mutex_unlock(&ctx->uring_lock); |
6307 | ||
6308 | if (ret < 0) | |
93d2bcd2 | 6309 | req_set_fail(req); |
889fca73 | 6310 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6311 | return 0; |
6312 | } | |
6313 | ||
bfe76559 | 6314 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6315 | { |
d625c6ee | 6316 | switch (req->opcode) { |
e781573e | 6317 | case IORING_OP_NOP: |
bfe76559 | 6318 | return 0; |
f67676d1 JA |
6319 | case IORING_OP_READV: |
6320 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6321 | case IORING_OP_READ: |
bfe76559 | 6322 | return io_read_prep(req, sqe); |
f67676d1 JA |
6323 | case IORING_OP_WRITEV: |
6324 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6325 | case IORING_OP_WRITE: |
bfe76559 | 6326 | return io_write_prep(req, sqe); |
0969e783 | 6327 | case IORING_OP_POLL_ADD: |
bfe76559 | 6328 | return io_poll_add_prep(req, sqe); |
0969e783 | 6329 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6330 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6331 | case IORING_OP_FSYNC: |
1155c76a | 6332 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6333 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6334 | return io_sfr_prep(req, sqe); |
03b1230c | 6335 | case IORING_OP_SENDMSG: |
fddaface | 6336 | case IORING_OP_SEND: |
bfe76559 | 6337 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6338 | case IORING_OP_RECVMSG: |
fddaface | 6339 | case IORING_OP_RECV: |
bfe76559 | 6340 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6341 | case IORING_OP_CONNECT: |
bfe76559 | 6342 | return io_connect_prep(req, sqe); |
2d28390a | 6343 | case IORING_OP_TIMEOUT: |
bfe76559 | 6344 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6345 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6346 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6347 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6348 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6349 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6350 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6351 | case IORING_OP_ACCEPT: |
bfe76559 | 6352 | return io_accept_prep(req, sqe); |
d63d1b5e | 6353 | case IORING_OP_FALLOCATE: |
bfe76559 | 6354 | return io_fallocate_prep(req, sqe); |
15b71abe | 6355 | case IORING_OP_OPENAT: |
bfe76559 | 6356 | return io_openat_prep(req, sqe); |
b5dba59e | 6357 | case IORING_OP_CLOSE: |
bfe76559 | 6358 | return io_close_prep(req, sqe); |
05f3fb3c | 6359 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6360 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6361 | case IORING_OP_STATX: |
bfe76559 | 6362 | return io_statx_prep(req, sqe); |
4840e418 | 6363 | case IORING_OP_FADVISE: |
bfe76559 | 6364 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6365 | case IORING_OP_MADVISE: |
bfe76559 | 6366 | return io_madvise_prep(req, sqe); |
cebdb986 | 6367 | case IORING_OP_OPENAT2: |
bfe76559 | 6368 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6369 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6370 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6371 | case IORING_OP_SPLICE: |
bfe76559 | 6372 | return io_splice_prep(req, sqe); |
ddf0322d | 6373 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6374 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6375 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6376 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6377 | case IORING_OP_TEE: |
bfe76559 | 6378 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6379 | case IORING_OP_SHUTDOWN: |
6380 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6381 | case IORING_OP_RENAMEAT: |
6382 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6383 | case IORING_OP_UNLINKAT: |
6384 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6385 | case IORING_OP_MKDIRAT: |
6386 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6387 | case IORING_OP_SYMLINKAT: |
6388 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6389 | case IORING_OP_LINKAT: |
6390 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6391 | } |
6392 | ||
bfe76559 PB |
6393 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6394 | req->opcode); | |
bd54b6fe | 6395 | return -EINVAL; |
bfe76559 PB |
6396 | } |
6397 | ||
93642ef8 | 6398 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6399 | { |
b7e298d2 PB |
6400 | if (!io_op_defs[req->opcode].needs_async_setup) |
6401 | return 0; | |
6402 | if (WARN_ON_ONCE(req->async_data)) | |
6403 | return -EFAULT; | |
6404 | if (io_alloc_async_data(req)) | |
6405 | return -EAGAIN; | |
6406 | ||
93642ef8 PB |
6407 | switch (req->opcode) { |
6408 | case IORING_OP_READV: | |
93642ef8 PB |
6409 | return io_rw_prep_async(req, READ); |
6410 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6411 | return io_rw_prep_async(req, WRITE); |
6412 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6413 | return io_sendmsg_prep_async(req); |
6414 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6415 | return io_recvmsg_prep_async(req); |
6416 | case IORING_OP_CONNECT: | |
6417 | return io_connect_prep_async(req); | |
6418 | } | |
b7e298d2 PB |
6419 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6420 | req->opcode); | |
6421 | return -EFAULT; | |
f67676d1 JA |
6422 | } |
6423 | ||
9cf7c104 PB |
6424 | static u32 io_get_sequence(struct io_kiocb *req) |
6425 | { | |
a3dbdf54 | 6426 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6427 | |
a3dbdf54 PB |
6428 | /* need original cached_sq_head, but it was increased for each req */ |
6429 | io_for_each_link(req, req) | |
6430 | seq--; | |
6431 | return seq; | |
9cf7c104 PB |
6432 | } |
6433 | ||
76cc33d7 | 6434 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6435 | { |
3c19966d | 6436 | struct io_kiocb *pos; |
a197f664 | 6437 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6438 | struct io_defer_entry *de; |
f67676d1 | 6439 | int ret; |
9cf7c104 | 6440 | u32 seq; |
de0617e4 | 6441 | |
b8ce1b9d PB |
6442 | if (req->flags & REQ_F_FAIL) { |
6443 | io_req_complete_fail_submit(req); | |
6444 | return true; | |
6445 | } | |
6446 | ||
3c19966d PB |
6447 | /* |
6448 | * If we need to drain a request in the middle of a link, drain the | |
6449 | * head request and the next request/link after the current link. | |
6450 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6451 | * maintained for every request of our link. | |
6452 | */ | |
6453 | if (ctx->drain_next) { | |
6454 | req->flags |= REQ_F_IO_DRAIN; | |
6455 | ctx->drain_next = false; | |
6456 | } | |
6457 | /* not interested in head, start from the first linked */ | |
6458 | io_for_each_link(pos, req->link) { | |
6459 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6460 | ctx->drain_next = true; | |
6461 | req->flags |= REQ_F_IO_DRAIN; | |
6462 | break; | |
6463 | } | |
6464 | } | |
6465 | ||
9d858b21 | 6466 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6467 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6468 | !(req->flags & REQ_F_IO_DRAIN))) { |
6469 | ctx->drain_active = false; | |
76cc33d7 | 6470 | return false; |
10c66904 | 6471 | } |
9cf7c104 PB |
6472 | |
6473 | seq = io_get_sequence(req); | |
6474 | /* Still a chance to pass the sequence check */ | |
6475 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6476 | return false; |
de0617e4 | 6477 | |
b7e298d2 | 6478 | ret = io_req_prep_async(req); |
be7053b7 | 6479 | if (ret) |
1b48773f | 6480 | goto fail; |
cbdcb435 | 6481 | io_prep_async_link(req); |
27dc8338 | 6482 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6483 | if (!de) { |
1b48773f PB |
6484 | ret = -ENOMEM; |
6485 | fail: | |
6486 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6487 | return true; |
6488 | } | |
2d28390a | 6489 | |
79ebeaee | 6490 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6491 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6492 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6493 | kfree(de); |
f237c30a | 6494 | io_queue_async_work(req, NULL); |
76cc33d7 | 6495 | return true; |
de0617e4 JA |
6496 | } |
6497 | ||
915967f6 | 6498 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6499 | de->req = req; |
9cf7c104 | 6500 | de->seq = seq; |
27dc8338 | 6501 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6502 | spin_unlock(&ctx->completion_lock); |
76cc33d7 | 6503 | return true; |
de0617e4 JA |
6504 | } |
6505 | ||
68fb8979 | 6506 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6507 | { |
0e1b6fe3 PB |
6508 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6509 | switch (req->opcode) { | |
6510 | case IORING_OP_READV: | |
6511 | case IORING_OP_READ_FIXED: | |
6512 | case IORING_OP_READ: | |
bcda7baa | 6513 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6514 | break; |
6515 | case IORING_OP_RECVMSG: | |
6516 | case IORING_OP_RECV: | |
bcda7baa | 6517 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6518 | break; |
6519 | } | |
99bc4c38 PB |
6520 | } |
6521 | ||
0e1b6fe3 PB |
6522 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6523 | switch (req->opcode) { | |
6524 | case IORING_OP_READV: | |
6525 | case IORING_OP_READ_FIXED: | |
6526 | case IORING_OP_READ: | |
6527 | case IORING_OP_WRITEV: | |
6528 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6529 | case IORING_OP_WRITE: { |
6530 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6531 | |
6532 | kfree(io->free_iovec); | |
0e1b6fe3 | 6533 | break; |
e8c2bc1f | 6534 | } |
0e1b6fe3 | 6535 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6536 | case IORING_OP_SENDMSG: { |
6537 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6538 | |
6539 | kfree(io->free_iov); | |
0e1b6fe3 | 6540 | break; |
e8c2bc1f | 6541 | } |
0e1b6fe3 PB |
6542 | case IORING_OP_SPLICE: |
6543 | case IORING_OP_TEE: | |
e1d767f0 PB |
6544 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6545 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6546 | break; |
f3cd4850 JA |
6547 | case IORING_OP_OPENAT: |
6548 | case IORING_OP_OPENAT2: | |
6549 | if (req->open.filename) | |
6550 | putname(req->open.filename); | |
6551 | break; | |
80a261fd JA |
6552 | case IORING_OP_RENAMEAT: |
6553 | putname(req->rename.oldpath); | |
6554 | putname(req->rename.newpath); | |
6555 | break; | |
14a1143b JA |
6556 | case IORING_OP_UNLINKAT: |
6557 | putname(req->unlink.filename); | |
6558 | break; | |
e34a02dc DK |
6559 | case IORING_OP_MKDIRAT: |
6560 | putname(req->mkdir.filename); | |
6561 | break; | |
7a8721f8 DK |
6562 | case IORING_OP_SYMLINKAT: |
6563 | putname(req->symlink.oldpath); | |
6564 | putname(req->symlink.newpath); | |
6565 | break; | |
cf30da90 DK |
6566 | case IORING_OP_LINKAT: |
6567 | putname(req->hardlink.oldpath); | |
6568 | putname(req->hardlink.newpath); | |
6569 | break; | |
0e1b6fe3 | 6570 | } |
99bc4c38 | 6571 | } |
75652a30 JA |
6572 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6573 | kfree(req->apoll->double_poll); | |
6574 | kfree(req->apoll); | |
6575 | req->apoll = NULL; | |
6576 | } | |
3a0a6902 PB |
6577 | if (req->flags & REQ_F_INFLIGHT) { |
6578 | struct io_uring_task *tctx = req->task->io_uring; | |
6579 | ||
6580 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6581 | } |
c854357b | 6582 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6583 | put_cred(req->creds); |
c854357b PB |
6584 | |
6585 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6586 | } |
6587 | ||
889fca73 | 6588 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6589 | { |
a197f664 | 6590 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6591 | const struct cred *creds = NULL; |
d625c6ee | 6592 | int ret; |
2b188cc1 | 6593 | |
b8e64b53 | 6594 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6595 | creds = override_creds(req->creds); |
5730b27e | 6596 | |
d625c6ee | 6597 | switch (req->opcode) { |
2b188cc1 | 6598 | case IORING_OP_NOP: |
889fca73 | 6599 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6600 | break; |
6601 | case IORING_OP_READV: | |
edafccee | 6602 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6603 | case IORING_OP_READ: |
889fca73 | 6604 | ret = io_read(req, issue_flags); |
edafccee | 6605 | break; |
3529d8c2 | 6606 | case IORING_OP_WRITEV: |
edafccee | 6607 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6608 | case IORING_OP_WRITE: |
889fca73 | 6609 | ret = io_write(req, issue_flags); |
2b188cc1 | 6610 | break; |
c992fe29 | 6611 | case IORING_OP_FSYNC: |
45d189c6 | 6612 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6613 | break; |
221c5eb2 | 6614 | case IORING_OP_POLL_ADD: |
61e98203 | 6615 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6616 | break; |
6617 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6618 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6619 | break; |
5d17b4a4 | 6620 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6621 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6622 | break; |
0fa03c62 | 6623 | case IORING_OP_SENDMSG: |
889fca73 | 6624 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6625 | break; |
fddaface | 6626 | case IORING_OP_SEND: |
889fca73 | 6627 | ret = io_send(req, issue_flags); |
0fa03c62 | 6628 | break; |
aa1fa28f | 6629 | case IORING_OP_RECVMSG: |
889fca73 | 6630 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6631 | break; |
fddaface | 6632 | case IORING_OP_RECV: |
889fca73 | 6633 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6634 | break; |
5262f567 | 6635 | case IORING_OP_TIMEOUT: |
61e98203 | 6636 | ret = io_timeout(req, issue_flags); |
5262f567 | 6637 | break; |
11365043 | 6638 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6639 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6640 | break; |
17f2fe35 | 6641 | case IORING_OP_ACCEPT: |
889fca73 | 6642 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6643 | break; |
f8e85cf2 | 6644 | case IORING_OP_CONNECT: |
889fca73 | 6645 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6646 | break; |
62755e35 | 6647 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6648 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6649 | break; |
d63d1b5e | 6650 | case IORING_OP_FALLOCATE: |
45d189c6 | 6651 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6652 | break; |
15b71abe | 6653 | case IORING_OP_OPENAT: |
45d189c6 | 6654 | ret = io_openat(req, issue_flags); |
15b71abe | 6655 | break; |
b5dba59e | 6656 | case IORING_OP_CLOSE: |
889fca73 | 6657 | ret = io_close(req, issue_flags); |
b5dba59e | 6658 | break; |
05f3fb3c | 6659 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6660 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6661 | break; |
eddc7ef5 | 6662 | case IORING_OP_STATX: |
45d189c6 | 6663 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6664 | break; |
4840e418 | 6665 | case IORING_OP_FADVISE: |
45d189c6 | 6666 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6667 | break; |
c1ca757b | 6668 | case IORING_OP_MADVISE: |
45d189c6 | 6669 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6670 | break; |
cebdb986 | 6671 | case IORING_OP_OPENAT2: |
45d189c6 | 6672 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6673 | break; |
3e4827b0 | 6674 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6675 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6676 | break; |
7d67af2c | 6677 | case IORING_OP_SPLICE: |
45d189c6 | 6678 | ret = io_splice(req, issue_flags); |
7d67af2c | 6679 | break; |
ddf0322d | 6680 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6681 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6682 | break; |
067524e9 | 6683 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6684 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6685 | break; |
f2a8d5c7 | 6686 | case IORING_OP_TEE: |
45d189c6 | 6687 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6688 | break; |
36f4fa68 | 6689 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6690 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6691 | break; |
80a261fd | 6692 | case IORING_OP_RENAMEAT: |
45d189c6 | 6693 | ret = io_renameat(req, issue_flags); |
80a261fd | 6694 | break; |
14a1143b | 6695 | case IORING_OP_UNLINKAT: |
45d189c6 | 6696 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6697 | break; |
e34a02dc DK |
6698 | case IORING_OP_MKDIRAT: |
6699 | ret = io_mkdirat(req, issue_flags); | |
6700 | break; | |
7a8721f8 DK |
6701 | case IORING_OP_SYMLINKAT: |
6702 | ret = io_symlinkat(req, issue_flags); | |
6703 | break; | |
cf30da90 DK |
6704 | case IORING_OP_LINKAT: |
6705 | ret = io_linkat(req, issue_flags); | |
6706 | break; | |
2b188cc1 JA |
6707 | default: |
6708 | ret = -EINVAL; | |
6709 | break; | |
6710 | } | |
6711 | ||
5730b27e JA |
6712 | if (creds) |
6713 | revert_creds(creds); | |
def596e9 JA |
6714 | if (ret) |
6715 | return ret; | |
b532576e | 6716 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6717 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6718 | io_iopoll_req_issued(req); | |
def596e9 JA |
6719 | |
6720 | return 0; | |
2b188cc1 JA |
6721 | } |
6722 | ||
ebc11b6c PB |
6723 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6724 | { | |
6725 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6726 | ||
6727 | req = io_put_req_find_next(req); | |
6728 | return req ? &req->work : NULL; | |
6729 | } | |
6730 | ||
5280f7e5 | 6731 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6732 | { |
6733 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6734 | struct io_kiocb *timeout; |
561fb04a | 6735 | int ret = 0; |
2b188cc1 | 6736 | |
48dcd38d PB |
6737 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6738 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6739 | __io_req_set_refcount(req, 2); | |
6740 | else | |
6741 | req_ref_get(req); | |
5d5901a3 | 6742 | |
6df1db6b PB |
6743 | timeout = io_prep_linked_timeout(req); |
6744 | if (timeout) | |
6745 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6746 | |
dadebc35 | 6747 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
4014d943 | 6748 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6749 | ret = -ECANCELED; |
31b51510 | 6750 | |
561fb04a | 6751 | if (!ret) { |
561fb04a | 6752 | do { |
889fca73 | 6753 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6754 | /* |
6755 | * We can get EAGAIN for polled IO even though we're | |
6756 | * forcing a sync submission from here, since we can't | |
6757 | * wait for request slots on the block side. | |
6758 | */ | |
6759 | if (ret != -EAGAIN) | |
6760 | break; | |
6761 | cond_resched(); | |
6762 | } while (1); | |
6763 | } | |
31b51510 | 6764 | |
a3df7698 | 6765 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6766 | if (ret) |
a3df7698 | 6767 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6768 | } |
6769 | ||
aeca241b | 6770 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6771 | unsigned i) |
65e19f54 | 6772 | { |
042b0d85 | 6773 | return &table->files[i]; |
dafecf19 PB |
6774 | } |
6775 | ||
65e19f54 JA |
6776 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6777 | int index) | |
6778 | { | |
aeca241b | 6779 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6780 | |
a04b0ac0 | 6781 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6782 | } |
6783 | ||
a04b0ac0 | 6784 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6785 | { |
6786 | unsigned long file_ptr = (unsigned long) file; | |
6787 | ||
b191e2df | 6788 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6789 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6790 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6791 | file_ptr |= FFS_ASYNC_WRITE; |
6792 | if (S_ISREG(file_inode(file)->i_mode)) | |
6793 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6794 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6795 | } |
6796 | ||
ac177053 PB |
6797 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6798 | struct io_kiocb *req, int fd) | |
09bb8394 | 6799 | { |
8da11c19 | 6800 | struct file *file; |
ac177053 | 6801 | unsigned long file_ptr; |
09bb8394 | 6802 | |
ac177053 PB |
6803 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6804 | return NULL; | |
6805 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6806 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6807 | file = (struct file *) (file_ptr & FFS_MASK); | |
6808 | file_ptr &= ~FFS_MASK; | |
6809 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6810 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
ac177053 PB |
6811 | io_req_set_rsrc_node(req); |
6812 | return file; | |
6813 | } | |
d44f554e | 6814 | |
ac177053 | 6815 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6816 | struct io_kiocb *req, int fd) |
6817 | { | |
62906e89 | 6818 | struct file *file = fget(fd); |
ac177053 PB |
6819 | |
6820 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6821 | |
ac177053 PB |
6822 | /* we don't allow fixed io_uring files */ |
6823 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6824 | io_req_track_inflight(req); | |
8371adf5 | 6825 | return file; |
09bb8394 JA |
6826 | } |
6827 | ||
ac177053 | 6828 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6829 | struct io_kiocb *req, int fd, bool fixed) |
6830 | { | |
6831 | if (fixed) | |
6832 | return io_file_get_fixed(ctx, req, fd); | |
6833 | else | |
62906e89 | 6834 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6835 | } |
6836 | ||
f237c30a | 6837 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6838 | { |
6839 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6840 | int ret; |
89b263f6 JA |
6841 | |
6842 | if (prev) { | |
8cb01fac | 6843 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6844 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6845 | io_put_req(prev); |
89b263f6 JA |
6846 | } else { |
6847 | io_req_complete_post(req, -ETIME, 0); | |
6848 | } | |
6849 | } | |
6850 | ||
2665abfd | 6851 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6852 | { |
ad8a48ac JA |
6853 | struct io_timeout_data *data = container_of(timer, |
6854 | struct io_timeout_data, timer); | |
90cd7e42 | 6855 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6856 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6857 | unsigned long flags; |
2665abfd | 6858 | |
89b263f6 | 6859 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6860 | prev = req->timeout.head; |
6861 | req->timeout.head = NULL; | |
2665abfd JA |
6862 | |
6863 | /* | |
6864 | * We don't expect the list to be empty, that will only happen if we | |
6865 | * race with the completion of the linked work. | |
6866 | */ | |
447c19f3 | 6867 | if (prev) { |
f2f87370 | 6868 | io_remove_next_linked(prev); |
447c19f3 PB |
6869 | if (!req_ref_inc_not_zero(prev)) |
6870 | prev = NULL; | |
6871 | } | |
ef9dd637 | 6872 | list_del(&req->timeout.list); |
89b263f6 JA |
6873 | req->timeout.prev = prev; |
6874 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6875 | |
89b263f6 JA |
6876 | req->io_task_work.func = io_req_task_link_timeout; |
6877 | io_req_task_work_add(req); | |
2665abfd JA |
6878 | return HRTIMER_NORESTART; |
6879 | } | |
6880 | ||
de968c18 | 6881 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6882 | { |
de968c18 PB |
6883 | struct io_ring_ctx *ctx = req->ctx; |
6884 | ||
89b263f6 | 6885 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6886 | /* |
f2f87370 PB |
6887 | * If the back reference is NULL, then our linked request finished |
6888 | * before we got a chance to setup the timer | |
76a46e06 | 6889 | */ |
90cd7e42 | 6890 | if (req->timeout.head) { |
e8c2bc1f | 6891 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6892 | |
ad8a48ac JA |
6893 | data->timer.function = io_link_timeout_fn; |
6894 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6895 | data->mode); | |
ef9dd637 | 6896 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6897 | } |
89b263f6 | 6898 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6899 | /* drop submission reference */ |
76a46e06 JA |
6900 | io_put_req(req); |
6901 | } | |
2665abfd | 6902 | |
c5eef2b9 | 6903 | static void __io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6904 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6905 | { |
906c6caa | 6906 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6907 | int ret; |
2b188cc1 | 6908 | |
59b735ae | 6909 | issue_sqe: |
c5eef2b9 | 6910 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6911 | |
491381ce JA |
6912 | /* |
6913 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6914 | * doesn't support non-blocking read/write attempts | |
6915 | */ | |
1840038e | 6916 | if (likely(!ret)) { |
e342c807 | 6917 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 | 6918 | struct io_ring_ctx *ctx = req->ctx; |
cd0ca2e0 | 6919 | struct io_submit_state *state = &ctx->submit_state; |
e65ef56d | 6920 | |
cd0ca2e0 PB |
6921 | state->compl_reqs[state->compl_nr++] = req; |
6922 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2a2758f2 | 6923 | io_submit_flush_completions(ctx); |
906c6caa | 6924 | return; |
0d63c148 | 6925 | } |
906c6caa PB |
6926 | |
6927 | linked_timeout = io_prep_linked_timeout(req); | |
6928 | if (linked_timeout) | |
6929 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6930 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
906c6caa PB |
6931 | linked_timeout = io_prep_linked_timeout(req); |
6932 | ||
59b735ae OL |
6933 | switch (io_arm_poll_handler(req)) { |
6934 | case IO_APOLL_READY: | |
906c6caa PB |
6935 | if (linked_timeout) |
6936 | io_unprep_linked_timeout(req); | |
59b735ae OL |
6937 | goto issue_sqe; |
6938 | case IO_APOLL_ABORTED: | |
1840038e PB |
6939 | /* |
6940 | * Queued up for async execution, worker will release | |
6941 | * submit reference when the iocb is actually submitted. | |
6942 | */ | |
f237c30a | 6943 | io_queue_async_work(req, NULL); |
59b735ae | 6944 | break; |
1840038e | 6945 | } |
906c6caa PB |
6946 | |
6947 | if (linked_timeout) | |
6948 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 | 6949 | } else { |
f41db273 | 6950 | io_req_complete_failed(req, ret); |
9e645e11 | 6951 | } |
2b188cc1 JA |
6952 | } |
6953 | ||
441b8a78 | 6954 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6955 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6956 | { |
10c66904 | 6957 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 6958 | return; |
4fe2c963 | 6959 | |
a8295b98 | 6960 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { |
c5eef2b9 | 6961 | __io_queue_sqe(req); |
a8295b98 | 6962 | } else if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 6963 | io_req_complete_fail_submit(req); |
76cc33d7 PB |
6964 | } else { |
6965 | int ret = io_req_prep_async(req); | |
6966 | ||
6967 | if (unlikely(ret)) | |
6968 | io_req_complete_failed(req, ret); | |
6969 | else | |
f237c30a | 6970 | io_queue_async_work(req, NULL); |
ce35a47a | 6971 | } |
4fe2c963 JL |
6972 | } |
6973 | ||
b16fed66 PB |
6974 | /* |
6975 | * Check SQE restrictions (opcode and flags). | |
6976 | * | |
6977 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6978 | */ | |
6979 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6980 | struct io_kiocb *req, | |
6981 | unsigned int sqe_flags) | |
4fe2c963 | 6982 | { |
4cfb25bf | 6983 | if (likely(!ctx->restricted)) |
b16fed66 PB |
6984 | return true; |
6985 | ||
6986 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6987 | return false; | |
6988 | ||
6989 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6990 | ctx->restrictions.sqe_flags_required) | |
6991 | return false; | |
6992 | ||
6993 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6994 | ctx->restrictions.sqe_flags_required)) | |
6995 | return false; | |
6996 | ||
6997 | return true; | |
4fe2c963 JL |
6998 | } |
6999 | ||
b16fed66 PB |
7000 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7001 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7002 | __must_hold(&ctx->uring_lock) |
b16fed66 PB |
7003 | { |
7004 | struct io_submit_state *state; | |
7005 | unsigned int sqe_flags; | |
003e8dcc | 7006 | int personality, ret = 0; |
b16fed66 | 7007 | |
864ea921 | 7008 | /* req is partially pre-initialised, see io_preinit_req() */ |
b16fed66 PB |
7009 | req->opcode = READ_ONCE(sqe->opcode); |
7010 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
7011 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7012 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7013 | req->file = NULL; |
b16fed66 | 7014 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7015 | req->task = current; |
b16fed66 PB |
7016 | |
7017 | /* enforce forwards compatibility on users */ | |
dddca226 | 7018 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 7019 | return -EINVAL; |
b16fed66 PB |
7020 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
7021 | return -EINVAL; | |
4cfb25bf | 7022 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
7023 | return -EACCES; |
7024 | ||
7025 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
7026 | !io_op_defs[req->opcode].buffer_select) | |
7027 | return -EOPNOTSUPP; | |
3c19966d PB |
7028 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
7029 | ctx->drain_active = true; | |
863e0560 | 7030 | |
003e8dcc JA |
7031 | personality = READ_ONCE(sqe->personality); |
7032 | if (personality) { | |
c10d1f98 PB |
7033 | req->creds = xa_load(&ctx->personalities, personality); |
7034 | if (!req->creds) | |
003e8dcc | 7035 | return -EINVAL; |
c10d1f98 | 7036 | get_cred(req->creds); |
b8e64b53 | 7037 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7038 | } |
b16fed66 PB |
7039 | state = &ctx->submit_state; |
7040 | ||
7041 | /* | |
7042 | * Plug now if we have more than 1 IO left after this, and the target | |
7043 | * is potentially a read/write to block based storage. | |
7044 | */ | |
7045 | if (!state->plug_started && state->ios_left > 1 && | |
7046 | io_op_defs[req->opcode].plug) { | |
7047 | blk_start_plug(&state->plug); | |
7048 | state->plug_started = true; | |
7049 | } | |
7050 | ||
7051 | if (io_op_defs[req->opcode].needs_file) { | |
62906e89 | 7052 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7053 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 PB |
7054 | if (unlikely(!req->file)) |
7055 | ret = -EBADF; | |
7056 | } | |
7057 | ||
7058 | state->ios_left--; | |
7059 | return ret; | |
7060 | } | |
7061 | ||
a6b8cadc | 7062 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7063 | const struct io_uring_sqe *sqe) |
282cdc86 | 7064 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7065 | { |
a1ab7b35 | 7066 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7067 | int ret; |
9e645e11 | 7068 | |
a6b8cadc PB |
7069 | ret = io_init_req(ctx, req, sqe); |
7070 | if (unlikely(ret)) { | |
7071 | fail_req: | |
a8295b98 | 7072 | /* fail even hard links since we don't submit */ |
de59bc10 | 7073 | if (link->head) { |
a8295b98 HX |
7074 | /* |
7075 | * we can judge a link req is failed or cancelled by if | |
7076 | * REQ_F_FAIL is set, but the head is an exception since | |
7077 | * it may be set REQ_F_FAIL because of other req's failure | |
7078 | * so let's leverage req->result to distinguish if a head | |
7079 | * is set REQ_F_FAIL because of its failure or other req's | |
7080 | * failure so that we can set the correct ret code for it. | |
7081 | * init result here to avoid affecting the normal path. | |
7082 | */ | |
7083 | if (!(link->head->flags & REQ_F_FAIL)) | |
7084 | req_fail_link_node(link->head, -ECANCELED); | |
7085 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7086 | /* | |
7087 | * the current req is a normal req, we should return | |
7088 | * error and thus break the submittion loop. | |
7089 | */ | |
7090 | io_req_complete_failed(req, ret); | |
7091 | return ret; | |
de59bc10 | 7092 | } |
a8295b98 HX |
7093 | req_fail_link_node(req, ret); |
7094 | } else { | |
7095 | ret = io_req_prep(req, sqe); | |
7096 | if (unlikely(ret)) | |
7097 | goto fail_req; | |
a6b8cadc | 7098 | } |
441b8a78 | 7099 | |
be7053b7 | 7100 | /* don't need @sqe from now on */ |
236daeae OL |
7101 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7102 | req->flags, true, | |
7103 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7104 | |
9e645e11 JA |
7105 | /* |
7106 | * If we already have a head request, queue this one for async | |
7107 | * submittal once the head completes. If we don't have a head but | |
7108 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7109 | * submitted sync once the chain is complete. If none of those | |
7110 | * conditions are true (normal request), then just queue it. | |
7111 | */ | |
863e0560 PB |
7112 | if (link->head) { |
7113 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7114 | |
a8295b98 HX |
7115 | if (!(req->flags & REQ_F_FAIL)) { |
7116 | ret = io_req_prep_async(req); | |
7117 | if (unlikely(ret)) { | |
7118 | req_fail_link_node(req, ret); | |
7119 | if (!(head->flags & REQ_F_FAIL)) | |
7120 | req_fail_link_node(head, -ECANCELED); | |
7121 | } | |
7122 | } | |
9d76377f | 7123 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7124 | link->last->link = req; |
863e0560 | 7125 | link->last = req; |
32fe525b PB |
7126 | |
7127 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 7128 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 7129 | link->head = NULL; |
5e159204 | 7130 | io_queue_sqe(head); |
32fe525b | 7131 | } |
9e645e11 | 7132 | } else { |
ef4ff581 | 7133 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
7134 | link->head = req; |
7135 | link->last = req; | |
711be031 | 7136 | } else { |
be7053b7 | 7137 | io_queue_sqe(req); |
711be031 | 7138 | } |
9e645e11 | 7139 | } |
2e6e1fde | 7140 | |
1d4240cc | 7141 | return 0; |
9e645e11 JA |
7142 | } |
7143 | ||
9a56a232 JA |
7144 | /* |
7145 | * Batched submission is done, ensure local IO is flushed out. | |
7146 | */ | |
ba88ff11 PB |
7147 | static void io_submit_state_end(struct io_submit_state *state, |
7148 | struct io_ring_ctx *ctx) | |
9a56a232 | 7149 | { |
a1ab7b35 | 7150 | if (state->link.head) |
de59bc10 | 7151 | io_queue_sqe(state->link.head); |
cd0ca2e0 | 7152 | if (state->compl_nr) |
2a2758f2 | 7153 | io_submit_flush_completions(ctx); |
27926b68 JA |
7154 | if (state->plug_started) |
7155 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7156 | } |
7157 | ||
7158 | /* | |
7159 | * Start submission side cache. | |
7160 | */ | |
7161 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7162 | unsigned int max_ios) |
9a56a232 | 7163 | { |
27926b68 | 7164 | state->plug_started = false; |
9a56a232 | 7165 | state->ios_left = max_ios; |
a1ab7b35 PB |
7166 | /* set only head, no need to init link_last in advance */ |
7167 | state->link.head = NULL; | |
9a56a232 JA |
7168 | } |
7169 | ||
2b188cc1 JA |
7170 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7171 | { | |
75b28aff | 7172 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7173 | |
caf582c6 PB |
7174 | /* |
7175 | * Ensure any loads from the SQEs are done at this point, | |
7176 | * since once we write the new head, the application could | |
7177 | * write new data to them. | |
7178 | */ | |
7179 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7180 | } |
7181 | ||
2b188cc1 | 7182 | /* |
dd9ae8a0 | 7183 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7184 | * that is mapped by userspace. This means that care needs to be taken to |
7185 | * ensure that reads are stable, as we cannot rely on userspace always | |
7186 | * being a good citizen. If members of the sqe are validated and then later | |
7187 | * used, it's important that those reads are done through READ_ONCE() to | |
7188 | * prevent a re-load down the line. | |
7189 | */ | |
709b302f | 7190 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7191 | { |
ea5ab3b5 | 7192 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7193 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7194 | |
7195 | /* | |
7196 | * The cached sq head (or cq tail) serves two purposes: | |
7197 | * | |
7198 | * 1) allows us to batch the cost of updating the user visible | |
7199 | * head updates. | |
7200 | * 2) allows the kernel side to track the head on its own, even | |
7201 | * though the application is the one updating it. | |
7202 | */ | |
17d3aeb3 | 7203 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7204 | if (likely(head < ctx->sq_entries)) |
7205 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7206 | |
7207 | /* drop invalid entries */ | |
15641e42 PB |
7208 | ctx->cq_extra--; |
7209 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7210 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7211 | return NULL; |
7212 | } | |
7213 | ||
0f212204 | 7214 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7215 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7216 | { |
46c4e16a | 7217 | int submitted = 0; |
6c271ce2 | 7218 | |
ee7d46d9 PB |
7219 | /* make sure SQ entry isn't read before tail */ |
7220 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
7221 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
7222 | return -EAGAIN; | |
9a10867a | 7223 | io_get_task_refs(nr); |
6c271ce2 | 7224 | |
ba88ff11 | 7225 | io_submit_state_start(&ctx->submit_state, nr); |
46c4e16a | 7226 | while (submitted < nr) { |
3529d8c2 | 7227 | const struct io_uring_sqe *sqe; |
196be95c | 7228 | struct io_kiocb *req; |
fb5ccc98 | 7229 | |
258b29a9 | 7230 | req = io_alloc_req(ctx); |
196be95c PB |
7231 | if (unlikely(!req)) { |
7232 | if (!submitted) | |
7233 | submitted = -EAGAIN; | |
fb5ccc98 | 7234 | break; |
196be95c | 7235 | } |
4fccfcbb PB |
7236 | sqe = io_get_sqe(ctx); |
7237 | if (unlikely(!sqe)) { | |
0c6e1d7f | 7238 | list_add(&req->inflight_entry, &ctx->submit_state.free_list); |
4fccfcbb PB |
7239 | break; |
7240 | } | |
d3656344 JA |
7241 | /* will complete beyond this point, count as submitted */ |
7242 | submitted++; | |
a1ab7b35 | 7243 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7244 | break; |
6c271ce2 JA |
7245 | } |
7246 | ||
9466f437 PB |
7247 | if (unlikely(submitted != nr)) { |
7248 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7249 | int unused = nr - ref_used; |
9466f437 | 7250 | |
09899b19 | 7251 | current->io_uring->cached_refs += unused; |
d8a6df10 | 7252 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 7253 | } |
6c271ce2 | 7254 | |
a1ab7b35 | 7255 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
7256 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7257 | io_commit_sqring(ctx); | |
7258 | ||
6c271ce2 JA |
7259 | return submitted; |
7260 | } | |
7261 | ||
e4b6d902 PB |
7262 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7263 | { | |
7264 | return READ_ONCE(sqd->state); | |
7265 | } | |
7266 | ||
23b3628e XW |
7267 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7268 | { | |
7269 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7270 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7271 | WRITE_ONCE(ctx->rings->sq_flags, |
7272 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7273 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7274 | } |
7275 | ||
7276 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7277 | { | |
79ebeaee | 7278 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7279 | WRITE_ONCE(ctx->rings->sq_flags, |
7280 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7281 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7282 | } |
7283 | ||
08369246 | 7284 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7285 | { |
c8d1ba58 | 7286 | unsigned int to_submit; |
bdcd3eab | 7287 | int ret = 0; |
6c271ce2 | 7288 | |
c8d1ba58 | 7289 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7290 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7291 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7292 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7293 | |
906a3c6f | 7294 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7295 | unsigned nr_events = 0; |
948e1947 PB |
7296 | const struct cred *creds = NULL; |
7297 | ||
7298 | if (ctx->sq_creds != current_cred()) | |
7299 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7300 | |
c8d1ba58 | 7301 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7302 | if (!list_empty(&ctx->iopoll_list)) |
a8576af9 | 7303 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7304 | |
3b763ba1 PB |
7305 | /* |
7306 | * Don't submit if refs are dying, good for io_uring_register(), | |
7307 | * but also it is relied upon by io_ring_exit_work() | |
7308 | */ | |
0298ef96 PB |
7309 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7310 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7311 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7312 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7313 | |
acfb381d PB |
7314 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7315 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7316 | if (creds) |
7317 | revert_creds(creds); | |
acfb381d | 7318 | } |
6c271ce2 | 7319 | |
08369246 XW |
7320 | return ret; |
7321 | } | |
6c271ce2 | 7322 | |
08369246 XW |
7323 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7324 | { | |
7325 | struct io_ring_ctx *ctx; | |
7326 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7327 | |
c9dca27d PB |
7328 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7329 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7330 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7331 | } |
6c271ce2 | 7332 | |
e4b6d902 PB |
7333 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7334 | { | |
7335 | bool did_sig = false; | |
7336 | struct ksignal ksig; | |
7337 | ||
7338 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7339 | signal_pending(current)) { | |
7340 | mutex_unlock(&sqd->lock); | |
7341 | if (signal_pending(current)) | |
7342 | did_sig = get_signal(&ksig); | |
7343 | cond_resched(); | |
7344 | mutex_lock(&sqd->lock); | |
7345 | } | |
e4b6d902 PB |
7346 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7347 | } | |
7348 | ||
c8d1ba58 JA |
7349 | static int io_sq_thread(void *data) |
7350 | { | |
69fb2131 JA |
7351 | struct io_sq_data *sqd = data; |
7352 | struct io_ring_ctx *ctx; | |
a0d9205f | 7353 | unsigned long timeout = 0; |
37d1e2e3 | 7354 | char buf[TASK_COMM_LEN]; |
08369246 | 7355 | DEFINE_WAIT(wait); |
6c271ce2 | 7356 | |
696ee88a | 7357 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7358 | set_task_comm(current, buf); |
37d1e2e3 JA |
7359 | |
7360 | if (sqd->sq_cpu != -1) | |
7361 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7362 | else | |
7363 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7364 | current->flags |= PF_NO_SETAFFINITY; | |
7365 | ||
09a6f4ef | 7366 | mutex_lock(&sqd->lock); |
e4b6d902 | 7367 | while (1) { |
1a924a80 | 7368 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7369 | |
e4b6d902 PB |
7370 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7371 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7372 | break; |
08369246 XW |
7373 | timeout = jiffies + sqd->sq_thread_idle; |
7374 | } | |
e4b6d902 | 7375 | |
e95eee2d | 7376 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7377 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7378 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7379 | |
08369246 XW |
7380 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
7381 | sqt_spin = true; | |
69fb2131 | 7382 | } |
dd432ea5 PB |
7383 | if (io_run_task_work()) |
7384 | sqt_spin = true; | |
6c271ce2 | 7385 | |
08369246 | 7386 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7387 | cond_resched(); |
08369246 XW |
7388 | if (sqt_spin) |
7389 | timeout = jiffies + sqd->sq_thread_idle; | |
7390 | continue; | |
7391 | } | |
7392 | ||
08369246 | 7393 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7394 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7395 | bool needs_sched = true; |
7396 | ||
724cb4f9 | 7397 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7398 | io_ring_set_wakeup_flag(ctx); |
7399 | ||
724cb4f9 HX |
7400 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
7401 | !list_empty_careful(&ctx->iopoll_list)) { | |
7402 | needs_sched = false; | |
7403 | break; | |
7404 | } | |
7405 | if (io_sqring_entries(ctx)) { | |
7406 | needs_sched = false; | |
7407 | break; | |
7408 | } | |
7409 | } | |
7410 | ||
7411 | if (needs_sched) { | |
7412 | mutex_unlock(&sqd->lock); | |
7413 | schedule(); | |
7414 | mutex_lock(&sqd->lock); | |
7415 | } | |
69fb2131 JA |
7416 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7417 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7418 | } |
08369246 XW |
7419 | |
7420 | finish_wait(&sqd->wait, &wait); | |
7421 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7422 | } |
28cea78a | 7423 | |
78cc687b | 7424 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7425 | sqd->thread = NULL; |
05962f95 | 7426 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7427 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7428 | io_run_task_work(); |
734551df PB |
7429 | mutex_unlock(&sqd->lock); |
7430 | ||
37d1e2e3 JA |
7431 | complete(&sqd->exited); |
7432 | do_exit(0); | |
6c271ce2 JA |
7433 | } |
7434 | ||
bda52162 JA |
7435 | struct io_wait_queue { |
7436 | struct wait_queue_entry wq; | |
7437 | struct io_ring_ctx *ctx; | |
5fd46178 | 7438 | unsigned cq_tail; |
bda52162 JA |
7439 | unsigned nr_timeouts; |
7440 | }; | |
7441 | ||
6c503150 | 7442 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7443 | { |
7444 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7445 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7446 | |
7447 | /* | |
d195a66e | 7448 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7449 | * started waiting. For timeouts, we always want to return to userspace, |
7450 | * regardless of event count. | |
7451 | */ | |
5fd46178 | 7452 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7453 | } |
7454 | ||
7455 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7456 | int wake_flags, void *key) | |
7457 | { | |
7458 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7459 | wq); | |
7460 | ||
6c503150 PB |
7461 | /* |
7462 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7463 | * the task, and the next invocation will do it. | |
7464 | */ | |
5ed7a37d | 7465 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7466 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7467 | return -1; | |
bda52162 JA |
7468 | } |
7469 | ||
af9c1a44 JA |
7470 | static int io_run_task_work_sig(void) |
7471 | { | |
7472 | if (io_run_task_work()) | |
7473 | return 1; | |
7474 | if (!signal_pending(current)) | |
7475 | return 0; | |
0b8cfa97 | 7476 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7477 | return -ERESTARTSYS; |
af9c1a44 JA |
7478 | return -EINTR; |
7479 | } | |
7480 | ||
eeb60b9a PB |
7481 | /* when returns >0, the caller should retry */ |
7482 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7483 | struct io_wait_queue *iowq, | |
7484 | signed long *timeout) | |
7485 | { | |
7486 | int ret; | |
7487 | ||
7488 | /* make sure we run task_work before checking for signals */ | |
7489 | ret = io_run_task_work_sig(); | |
7490 | if (ret || io_should_wake(iowq)) | |
7491 | return ret; | |
7492 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7493 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7494 | return 1; |
7495 | ||
7496 | *timeout = schedule_timeout(*timeout); | |
7497 | return !*timeout ? -ETIME : 1; | |
7498 | } | |
7499 | ||
2b188cc1 JA |
7500 | /* |
7501 | * Wait until events become available, if we don't already have some. The | |
7502 | * application must reap them itself, as they reside on the shared cq ring. | |
7503 | */ | |
7504 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7505 | const sigset_t __user *sig, size_t sigsz, |
7506 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7507 | { |
90291099 | 7508 | struct io_wait_queue iowq; |
75b28aff | 7509 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7510 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7511 | int ret; | |
2b188cc1 | 7512 | |
b41e9852 | 7513 | do { |
90f67366 | 7514 | io_cqring_overflow_flush(ctx); |
6c503150 | 7515 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7516 | return 0; |
4c6e277c | 7517 | if (!io_run_task_work()) |
b41e9852 | 7518 | break; |
b41e9852 | 7519 | } while (1); |
2b188cc1 JA |
7520 | |
7521 | if (sig) { | |
9e75ad5d AB |
7522 | #ifdef CONFIG_COMPAT |
7523 | if (in_compat_syscall()) | |
7524 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7525 | sigsz); |
9e75ad5d AB |
7526 | else |
7527 | #endif | |
b772434b | 7528 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7529 | |
2b188cc1 JA |
7530 | if (ret) |
7531 | return ret; | |
7532 | } | |
7533 | ||
c73ebb68 | 7534 | if (uts) { |
c1d5a224 PB |
7535 | struct timespec64 ts; |
7536 | ||
c73ebb68 HX |
7537 | if (get_timespec64(&ts, uts)) |
7538 | return -EFAULT; | |
7539 | timeout = timespec64_to_jiffies(&ts); | |
7540 | } | |
7541 | ||
90291099 PB |
7542 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7543 | iowq.wq.private = current; | |
7544 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7545 | iowq.ctx = ctx; | |
bda52162 | 7546 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7547 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7548 | |
c826bd7a | 7549 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7550 | do { |
ca0a2651 | 7551 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7552 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7553 | ret = -EBUSY; |
7554 | break; | |
7555 | } | |
311997b3 | 7556 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7557 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7558 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7559 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7560 | cond_resched(); |
eeb60b9a | 7561 | } while (ret > 0); |
bda52162 | 7562 | |
b7db41c9 | 7563 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7564 | |
75b28aff | 7565 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7566 | } |
7567 | ||
9123c8ff | 7568 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7569 | { |
9123c8ff | 7570 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7571 | |
846a4ef2 | 7572 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7573 | kfree(table[i]); |
7574 | kfree(table); | |
7575 | } | |
7576 | ||
7577 | static void **io_alloc_page_table(size_t size) | |
7578 | { | |
7579 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7580 | size_t init_size = size; | |
7581 | void **table; | |
7582 | ||
0bea96f5 | 7583 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7584 | if (!table) |
7585 | return NULL; | |
7586 | ||
7587 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7588 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7589 | |
0bea96f5 | 7590 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7591 | if (!table[i]) { |
7592 | io_free_page_table(table, init_size); | |
7593 | return NULL; | |
7594 | } | |
7595 | size -= this_size; | |
7596 | } | |
7597 | return table; | |
05f3fb3c JA |
7598 | } |
7599 | ||
28a9fe25 | 7600 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7601 | { |
28a9fe25 PB |
7602 | percpu_ref_exit(&ref_node->refs); |
7603 | kfree(ref_node); | |
1642b445 PB |
7604 | } |
7605 | ||
b9bd2bea PB |
7606 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
7607 | { | |
7608 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7609 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7610 | unsigned long flags; | |
7611 | bool first_add = false; | |
7612 | ||
7613 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7614 | node->done = true; | |
7615 | ||
7616 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7617 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7618 | struct io_rsrc_node, node); | |
7619 | /* recycle ref nodes in order */ | |
7620 | if (!node->done) | |
7621 | break; | |
7622 | list_del(&node->node); | |
7623 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7624 | } | |
7625 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7626 | ||
7627 | if (first_add) | |
7628 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7629 | } | |
7630 | ||
7631 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7632 | { | |
7633 | struct io_rsrc_node *ref_node; | |
7634 | ||
7635 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7636 | if (!ref_node) | |
7637 | return NULL; | |
7638 | ||
7639 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7640 | 0, GFP_KERNEL)) { | |
7641 | kfree(ref_node); | |
7642 | return NULL; | |
7643 | } | |
7644 | INIT_LIST_HEAD(&ref_node->node); | |
7645 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7646 | ref_node->done = false; | |
7647 | return ref_node; | |
7648 | } | |
7649 | ||
a7f0ed5a PB |
7650 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7651 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7652 | { |
a7f0ed5a PB |
7653 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7654 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7655 | |
a7f0ed5a PB |
7656 | if (data_to_kill) { |
7657 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7658 | |
a7f0ed5a | 7659 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7660 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7661 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7662 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7663 | |
3e942498 | 7664 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7665 | percpu_ref_kill(&rsrc_node->refs); |
7666 | ctx->rsrc_node = NULL; | |
7667 | } | |
6b06314c | 7668 | |
a7f0ed5a PB |
7669 | if (!ctx->rsrc_node) { |
7670 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7671 | ctx->rsrc_backup_node = NULL; | |
7672 | } | |
8bad28d8 HX |
7673 | } |
7674 | ||
a7f0ed5a | 7675 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7676 | { |
7677 | if (ctx->rsrc_backup_node) | |
7678 | return 0; | |
b895c9a6 | 7679 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7680 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7681 | } |
7682 | ||
40ae0ff7 | 7683 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7684 | { |
7685 | int ret; | |
05589553 | 7686 | |
215c3902 | 7687 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7688 | if (data->quiesce) |
7689 | return -ENXIO; | |
05589553 | 7690 | |
8bad28d8 | 7691 | data->quiesce = true; |
1ffc5422 | 7692 | do { |
a7f0ed5a | 7693 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7694 | if (ret) |
f2303b1f | 7695 | break; |
a7f0ed5a | 7696 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7697 | |
3e942498 PB |
7698 | /* kill initial ref, already quiesced if zero */ |
7699 | if (atomic_dec_and_test(&data->refs)) | |
7700 | break; | |
c018db4a | 7701 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7702 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7703 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7704 | if (!ret) { |
7705 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7706 | break; |
c018db4a | 7707 | } |
8bad28d8 | 7708 | |
3e942498 PB |
7709 | atomic_inc(&data->refs); |
7710 | /* wait for all works potentially completing data->done */ | |
7711 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7712 | reinit_completion(&data->done); |
8dd03afe | 7713 | |
1ffc5422 | 7714 | ret = io_run_task_work_sig(); |
8bad28d8 | 7715 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7716 | } while (ret >= 0); |
8bad28d8 | 7717 | data->quiesce = false; |
05f3fb3c | 7718 | |
8bad28d8 | 7719 | return ret; |
d7954b2b BM |
7720 | } |
7721 | ||
2d091d62 PB |
7722 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7723 | { | |
7724 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7725 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7726 | ||
7727 | return &data->tags[table_idx][off]; | |
7728 | } | |
7729 | ||
44b31f2f | 7730 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7731 | { |
2d091d62 PB |
7732 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7733 | ||
7734 | if (data->tags) | |
7735 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7736 | kfree(data); |
7737 | } | |
7738 | ||
d878c816 PB |
7739 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7740 | u64 __user *utags, unsigned nr, | |
7741 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7742 | { |
b895c9a6 | 7743 | struct io_rsrc_data *data; |
2d091d62 | 7744 | int ret = -ENOMEM; |
d878c816 | 7745 | unsigned i; |
1ad555c6 BM |
7746 | |
7747 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7748 | if (!data) | |
d878c816 | 7749 | return -ENOMEM; |
2d091d62 | 7750 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7751 | if (!data->tags) { |
1ad555c6 | 7752 | kfree(data); |
d878c816 PB |
7753 | return -ENOMEM; |
7754 | } | |
2d091d62 PB |
7755 | |
7756 | data->nr = nr; | |
7757 | data->ctx = ctx; | |
7758 | data->do_put = do_put; | |
d878c816 | 7759 | if (utags) { |
2d091d62 | 7760 | ret = -EFAULT; |
d878c816 | 7761 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7762 | u64 *tag_slot = io_get_tag_slot(data, i); |
7763 | ||
7764 | if (copy_from_user(tag_slot, &utags[i], | |
7765 | sizeof(*tag_slot))) | |
2d091d62 | 7766 | goto fail; |
d878c816 | 7767 | } |
1ad555c6 | 7768 | } |
b60c8dce | 7769 | |
3e942498 | 7770 | atomic_set(&data->refs, 1); |
1ad555c6 | 7771 | init_completion(&data->done); |
d878c816 PB |
7772 | *pdata = data; |
7773 | return 0; | |
2d091d62 PB |
7774 | fail: |
7775 | io_rsrc_data_free(data); | |
7776 | return ret; | |
1ad555c6 BM |
7777 | } |
7778 | ||
9123c8ff PB |
7779 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7780 | { | |
0bea96f5 PB |
7781 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7782 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7783 | return !!table->files; |
7784 | } | |
7785 | ||
042b0d85 | 7786 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7787 | { |
042b0d85 | 7788 | kvfree(table->files); |
9123c8ff PB |
7789 | table->files = NULL; |
7790 | } | |
7791 | ||
fff4db76 | 7792 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7793 | { |
fff4db76 PB |
7794 | #if defined(CONFIG_UNIX) |
7795 | if (ctx->ring_sock) { | |
7796 | struct sock *sock = ctx->ring_sock->sk; | |
7797 | struct sk_buff *skb; | |
7798 | ||
7799 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7800 | kfree_skb(skb); | |
7801 | } | |
7802 | #else | |
7803 | int i; | |
7804 | ||
7805 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7806 | struct file *file; | |
7807 | ||
7808 | file = io_file_from_index(ctx, i); | |
7809 | if (file) | |
7810 | fput(file); | |
7811 | } | |
7812 | #endif | |
042b0d85 | 7813 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7814 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7815 | ctx->file_data = NULL; |
7816 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7817 | } |
7818 | ||
d7954b2b BM |
7819 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7820 | { | |
d7954b2b BM |
7821 | int ret; |
7822 | ||
08480400 | 7823 | if (!ctx->file_data) |
d7954b2b | 7824 | return -ENXIO; |
08480400 PB |
7825 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7826 | if (!ret) | |
7827 | __io_sqe_files_unregister(ctx); | |
7828 | return ret; | |
6b06314c JA |
7829 | } |
7830 | ||
37d1e2e3 | 7831 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7832 | __releases(&sqd->lock) |
37d1e2e3 | 7833 | { |
521d6a73 PB |
7834 | WARN_ON_ONCE(sqd->thread == current); |
7835 | ||
9e138a48 PB |
7836 | /* |
7837 | * Do the dance but not conditional clear_bit() because it'd race with | |
7838 | * other threads incrementing park_pending and setting the bit. | |
7839 | */ | |
37d1e2e3 | 7840 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7841 | if (atomic_dec_return(&sqd->park_pending)) |
7842 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7843 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7844 | } |
7845 | ||
86e0d676 | 7846 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7847 | __acquires(&sqd->lock) |
37d1e2e3 | 7848 | { |
521d6a73 PB |
7849 | WARN_ON_ONCE(sqd->thread == current); |
7850 | ||
9e138a48 | 7851 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7852 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7853 | mutex_lock(&sqd->lock); |
05962f95 | 7854 | if (sqd->thread) |
86e0d676 | 7855 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7856 | } |
7857 | ||
7858 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7859 | { | |
521d6a73 | 7860 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7861 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7862 | |
05962f95 | 7863 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7864 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7865 | if (sqd->thread) |
7866 | wake_up_process(sqd->thread); | |
09a6f4ef | 7867 | mutex_unlock(&sqd->lock); |
05962f95 | 7868 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7869 | } |
7870 | ||
534ca6d6 | 7871 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7872 | { |
534ca6d6 | 7873 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7874 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7875 | ||
37d1e2e3 JA |
7876 | io_sq_thread_stop(sqd); |
7877 | kfree(sqd); | |
7878 | } | |
7879 | } | |
7880 | ||
7881 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7882 | { | |
7883 | struct io_sq_data *sqd = ctx->sq_data; | |
7884 | ||
7885 | if (sqd) { | |
05962f95 | 7886 | io_sq_thread_park(sqd); |
521d6a73 | 7887 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7888 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7889 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7890 | |
7891 | io_put_sq_data(sqd); | |
7892 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7893 | } |
7894 | } | |
7895 | ||
aa06165d JA |
7896 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7897 | { | |
7898 | struct io_ring_ctx *ctx_attach; | |
7899 | struct io_sq_data *sqd; | |
7900 | struct fd f; | |
7901 | ||
7902 | f = fdget(p->wq_fd); | |
7903 | if (!f.file) | |
7904 | return ERR_PTR(-ENXIO); | |
7905 | if (f.file->f_op != &io_uring_fops) { | |
7906 | fdput(f); | |
7907 | return ERR_PTR(-EINVAL); | |
7908 | } | |
7909 | ||
7910 | ctx_attach = f.file->private_data; | |
7911 | sqd = ctx_attach->sq_data; | |
7912 | if (!sqd) { | |
7913 | fdput(f); | |
7914 | return ERR_PTR(-EINVAL); | |
7915 | } | |
5c2469e0 JA |
7916 | if (sqd->task_tgid != current->tgid) { |
7917 | fdput(f); | |
7918 | return ERR_PTR(-EPERM); | |
7919 | } | |
aa06165d JA |
7920 | |
7921 | refcount_inc(&sqd->refs); | |
7922 | fdput(f); | |
7923 | return sqd; | |
7924 | } | |
7925 | ||
26984fbf PB |
7926 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7927 | bool *attached) | |
534ca6d6 JA |
7928 | { |
7929 | struct io_sq_data *sqd; | |
7930 | ||
26984fbf | 7931 | *attached = false; |
5c2469e0 JA |
7932 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7933 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7934 | if (!IS_ERR(sqd)) { |
7935 | *attached = true; | |
5c2469e0 | 7936 | return sqd; |
26984fbf | 7937 | } |
5c2469e0 JA |
7938 | /* fall through for EPERM case, setup new sqd/task */ |
7939 | if (PTR_ERR(sqd) != -EPERM) | |
7940 | return sqd; | |
7941 | } | |
aa06165d | 7942 | |
534ca6d6 JA |
7943 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7944 | if (!sqd) | |
7945 | return ERR_PTR(-ENOMEM); | |
7946 | ||
9e138a48 | 7947 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7948 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7949 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7950 | mutex_init(&sqd->lock); |
534ca6d6 | 7951 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7952 | init_completion(&sqd->exited); |
534ca6d6 JA |
7953 | return sqd; |
7954 | } | |
7955 | ||
6b06314c | 7956 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7957 | /* |
7958 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7959 | * the io_uring can be safely unregistered on process exit, even if we have | |
7960 | * loops in the file referencing. | |
7961 | */ | |
7962 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7963 | { | |
7964 | struct sock *sk = ctx->ring_sock->sk; | |
7965 | struct scm_fp_list *fpl; | |
7966 | struct sk_buff *skb; | |
08a45173 | 7967 | int i, nr_files; |
6b06314c | 7968 | |
6b06314c JA |
7969 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7970 | if (!fpl) | |
7971 | return -ENOMEM; | |
7972 | ||
7973 | skb = alloc_skb(0, GFP_KERNEL); | |
7974 | if (!skb) { | |
7975 | kfree(fpl); | |
7976 | return -ENOMEM; | |
7977 | } | |
7978 | ||
7979 | skb->sk = sk; | |
6b06314c | 7980 | |
08a45173 | 7981 | nr_files = 0; |
62e398be | 7982 | fpl->user = get_uid(current_user()); |
6b06314c | 7983 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7984 | struct file *file = io_file_from_index(ctx, i + offset); |
7985 | ||
7986 | if (!file) | |
08a45173 | 7987 | continue; |
65e19f54 | 7988 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7989 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7990 | nr_files++; | |
6b06314c JA |
7991 | } |
7992 | ||
08a45173 JA |
7993 | if (nr_files) { |
7994 | fpl->max = SCM_MAX_FD; | |
7995 | fpl->count = nr_files; | |
7996 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7997 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7998 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7999 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8000 | |
08a45173 JA |
8001 | for (i = 0; i < nr_files; i++) |
8002 | fput(fpl->fp[i]); | |
8003 | } else { | |
8004 | kfree_skb(skb); | |
8005 | kfree(fpl); | |
8006 | } | |
6b06314c JA |
8007 | |
8008 | return 0; | |
8009 | } | |
8010 | ||
8011 | /* | |
8012 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8013 | * causes regular reference counting to break down. We rely on the UNIX | |
8014 | * garbage collection to take care of this problem for us. | |
8015 | */ | |
8016 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8017 | { | |
8018 | unsigned left, total; | |
8019 | int ret = 0; | |
8020 | ||
8021 | total = 0; | |
8022 | left = ctx->nr_user_files; | |
8023 | while (left) { | |
8024 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8025 | |
8026 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8027 | if (ret) | |
8028 | break; | |
8029 | left -= this_files; | |
8030 | total += this_files; | |
8031 | } | |
8032 | ||
8033 | if (!ret) | |
8034 | return 0; | |
8035 | ||
8036 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8037 | struct file *file = io_file_from_index(ctx, total); |
8038 | ||
8039 | if (file) | |
8040 | fput(file); | |
6b06314c JA |
8041 | total++; |
8042 | } | |
8043 | ||
8044 | return ret; | |
8045 | } | |
8046 | #else | |
8047 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8048 | { | |
8049 | return 0; | |
8050 | } | |
8051 | #endif | |
8052 | ||
47e90392 | 8053 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8054 | { |
50238531 | 8055 | struct file *file = prsrc->file; |
05f3fb3c JA |
8056 | #if defined(CONFIG_UNIX) |
8057 | struct sock *sock = ctx->ring_sock->sk; | |
8058 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8059 | struct sk_buff *skb; | |
8060 | int i; | |
8061 | ||
8062 | __skb_queue_head_init(&list); | |
8063 | ||
8064 | /* | |
8065 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8066 | * remove this entry and rearrange the file array. | |
8067 | */ | |
8068 | skb = skb_dequeue(head); | |
8069 | while (skb) { | |
8070 | struct scm_fp_list *fp; | |
8071 | ||
8072 | fp = UNIXCB(skb).fp; | |
8073 | for (i = 0; i < fp->count; i++) { | |
8074 | int left; | |
8075 | ||
8076 | if (fp->fp[i] != file) | |
8077 | continue; | |
8078 | ||
8079 | unix_notinflight(fp->user, fp->fp[i]); | |
8080 | left = fp->count - 1 - i; | |
8081 | if (left) { | |
8082 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8083 | left * sizeof(struct file *)); | |
8084 | } | |
8085 | fp->count--; | |
8086 | if (!fp->count) { | |
8087 | kfree_skb(skb); | |
8088 | skb = NULL; | |
8089 | } else { | |
8090 | __skb_queue_tail(&list, skb); | |
8091 | } | |
8092 | fput(file); | |
8093 | file = NULL; | |
8094 | break; | |
8095 | } | |
8096 | ||
8097 | if (!file) | |
8098 | break; | |
8099 | ||
8100 | __skb_queue_tail(&list, skb); | |
8101 | ||
8102 | skb = skb_dequeue(head); | |
8103 | } | |
8104 | ||
8105 | if (skb_peek(&list)) { | |
8106 | spin_lock_irq(&head->lock); | |
8107 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8108 | __skb_queue_tail(head, skb); | |
8109 | spin_unlock_irq(&head->lock); | |
8110 | } | |
8111 | #else | |
8112 | fput(file); | |
8113 | #endif | |
8114 | } | |
8115 | ||
b895c9a6 | 8116 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8117 | { |
b895c9a6 | 8118 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8119 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8120 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8121 | |
269bbe5f BM |
8122 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8123 | list_del(&prsrc->list); | |
b60c8dce PB |
8124 | |
8125 | if (prsrc->tag) { | |
8126 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8127 | |
8128 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8129 | spin_lock(&ctx->completion_lock); |
b60c8dce | 8130 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 8131 | ctx->cq_extra++; |
b60c8dce | 8132 | io_commit_cqring(ctx); |
79ebeaee | 8133 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8134 | io_cqring_ev_posted(ctx); |
8135 | io_ring_submit_unlock(ctx, lock_ring); | |
8136 | } | |
8137 | ||
40ae0ff7 | 8138 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8139 | kfree(prsrc); |
65e19f54 | 8140 | } |
05589553 | 8141 | |
28a9fe25 | 8142 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8143 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8144 | complete(&rsrc_data->done); | |
2faf852d | 8145 | } |
65e19f54 | 8146 | |
269bbe5f | 8147 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8148 | { |
8149 | struct io_ring_ctx *ctx; | |
8150 | struct llist_node *node; | |
8151 | ||
269bbe5f BM |
8152 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8153 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8154 | |
8155 | while (node) { | |
b895c9a6 | 8156 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8157 | struct llist_node *next = node->next; |
8158 | ||
b895c9a6 | 8159 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8160 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8161 | node = next; |
8162 | } | |
8163 | } | |
8164 | ||
6b06314c | 8165 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8166 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8167 | { |
8168 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8169 | struct file *file; |
f3baed39 | 8170 | int fd, ret; |
846a4ef2 | 8171 | unsigned i; |
6b06314c | 8172 | |
05f3fb3c | 8173 | if (ctx->file_data) |
6b06314c JA |
8174 | return -EBUSY; |
8175 | if (!nr_args) | |
8176 | return -EINVAL; | |
8177 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8178 | return -EMFILE; | |
3a1b8a4e PB |
8179 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8180 | return -EMFILE; | |
a7f0ed5a | 8181 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8182 | if (ret) |
8183 | return ret; | |
d878c816 PB |
8184 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8185 | &ctx->file_data); | |
8186 | if (ret) | |
8187 | return ret; | |
6b06314c | 8188 | |
f3baed39 | 8189 | ret = -ENOMEM; |
aeca241b | 8190 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8191 | goto out_free; |
65e19f54 | 8192 | |
08a45173 | 8193 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8194 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8195 | ret = -EFAULT; |
8196 | goto out_fput; | |
8197 | } | |
08a45173 | 8198 | /* allow sparse sets */ |
792e3582 PB |
8199 | if (fd == -1) { |
8200 | ret = -EINVAL; | |
2d091d62 | 8201 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8202 | goto out_fput; |
08a45173 | 8203 | continue; |
792e3582 | 8204 | } |
6b06314c | 8205 | |
05f3fb3c | 8206 | file = fget(fd); |
6b06314c | 8207 | ret = -EBADF; |
792e3582 | 8208 | if (unlikely(!file)) |
600cf3f8 | 8209 | goto out_fput; |
05f3fb3c | 8210 | |
6b06314c JA |
8211 | /* |
8212 | * Don't allow io_uring instances to be registered. If UNIX | |
8213 | * isn't enabled, then this causes a reference cycle and this | |
8214 | * instance can never get freed. If UNIX is enabled we'll | |
8215 | * handle it just fine, but there's still no point in allowing | |
8216 | * a ring fd as it doesn't support regular read/write anyway. | |
8217 | */ | |
05f3fb3c JA |
8218 | if (file->f_op == &io_uring_fops) { |
8219 | fput(file); | |
600cf3f8 | 8220 | goto out_fput; |
6b06314c | 8221 | } |
aeca241b | 8222 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8223 | } |
8224 | ||
6b06314c | 8225 | ret = io_sqe_files_scm(ctx); |
05589553 | 8226 | if (ret) { |
08480400 | 8227 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8228 | return ret; |
8229 | } | |
6b06314c | 8230 | |
a7f0ed5a | 8231 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8232 | return ret; |
600cf3f8 PB |
8233 | out_fput: |
8234 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8235 | file = io_file_from_index(ctx, i); | |
8236 | if (file) | |
8237 | fput(file); | |
8238 | } | |
042b0d85 | 8239 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8240 | ctx->nr_user_files = 0; |
600cf3f8 | 8241 | out_free: |
44b31f2f | 8242 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8243 | ctx->file_data = NULL; |
6b06314c JA |
8244 | return ret; |
8245 | } | |
8246 | ||
c3a31e60 JA |
8247 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8248 | int index) | |
8249 | { | |
8250 | #if defined(CONFIG_UNIX) | |
8251 | struct sock *sock = ctx->ring_sock->sk; | |
8252 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8253 | struct sk_buff *skb; | |
8254 | ||
8255 | /* | |
8256 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8257 | * file set. If there's no room, fall back to allocating a new skb | |
8258 | * and filling it in. | |
8259 | */ | |
8260 | spin_lock_irq(&head->lock); | |
8261 | skb = skb_peek(head); | |
8262 | if (skb) { | |
8263 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8264 | ||
8265 | if (fpl->count < SCM_MAX_FD) { | |
8266 | __skb_unlink(skb, head); | |
8267 | spin_unlock_irq(&head->lock); | |
8268 | fpl->fp[fpl->count] = get_file(file); | |
8269 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8270 | fpl->count++; | |
8271 | spin_lock_irq(&head->lock); | |
8272 | __skb_queue_head(head, skb); | |
8273 | } else { | |
8274 | skb = NULL; | |
8275 | } | |
8276 | } | |
8277 | spin_unlock_irq(&head->lock); | |
8278 | ||
8279 | if (skb) { | |
8280 | fput(file); | |
8281 | return 0; | |
8282 | } | |
8283 | ||
8284 | return __io_sqe_files_scm(ctx, 1, index); | |
8285 | #else | |
8286 | return 0; | |
8287 | #endif | |
8288 | } | |
8289 | ||
b9445598 PB |
8290 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8291 | unsigned int issue_flags, u32 slot_index) | |
8292 | { | |
8293 | struct io_ring_ctx *ctx = req->ctx; | |
8294 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
8295 | struct io_fixed_file *file_slot; | |
8296 | int ret = -EBADF; | |
8297 | ||
8298 | io_ring_submit_lock(ctx, !force_nonblock); | |
8299 | if (file->f_op == &io_uring_fops) | |
8300 | goto err; | |
8301 | ret = -ENXIO; | |
8302 | if (!ctx->file_data) | |
8303 | goto err; | |
8304 | ret = -EINVAL; | |
8305 | if (slot_index >= ctx->nr_user_files) | |
8306 | goto err; | |
8307 | ||
8308 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8309 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
8310 | ret = -EBADF; | |
8311 | if (file_slot->file_ptr) | |
8312 | goto err; | |
8313 | ||
8314 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8315 | io_fixed_file_set(file_slot, file); | |
8316 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8317 | if (ret) { | |
8318 | file_slot->file_ptr = 0; | |
8319 | goto err; | |
8320 | } | |
8321 | ||
8322 | ret = 0; | |
8323 | err: | |
8324 | io_ring_submit_unlock(ctx, !force_nonblock); | |
8325 | if (ret) | |
8326 | fput(file); | |
8327 | return ret; | |
8328 | } | |
8329 | ||
b60c8dce | 8330 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
e7c78371 | 8331 | struct io_rsrc_node *node, void *rsrc) |
05f3fb3c | 8332 | { |
269bbe5f | 8333 | struct io_rsrc_put *prsrc; |
05f3fb3c | 8334 | |
269bbe5f BM |
8335 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
8336 | if (!prsrc) | |
a5318d3c | 8337 | return -ENOMEM; |
05f3fb3c | 8338 | |
2d091d62 | 8339 | prsrc->tag = *io_get_tag_slot(data, idx); |
50238531 | 8340 | prsrc->rsrc = rsrc; |
e7c78371 | 8341 | list_add(&prsrc->list, &node->rsrc_list); |
a5318d3c | 8342 | return 0; |
05f3fb3c JA |
8343 | } |
8344 | ||
8345 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
c3bdad02 | 8346 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8347 | unsigned nr_args) |
8348 | { | |
c3bdad02 | 8349 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8350 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8351 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8352 | struct io_fixed_file *file_slot; |
8353 | struct file *file; | |
98f0b3b4 PB |
8354 | int fd, i, err = 0; |
8355 | unsigned int done; | |
05589553 | 8356 | bool needs_switch = false; |
c3a31e60 | 8357 | |
98f0b3b4 PB |
8358 | if (!ctx->file_data) |
8359 | return -ENXIO; | |
8360 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8361 | return -EINVAL; |
8362 | ||
67973b93 | 8363 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8364 | u64 tag = 0; |
8365 | ||
8366 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8367 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8368 | err = -EFAULT; |
8369 | break; | |
8370 | } | |
c3bdad02 PB |
8371 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8372 | err = -EINVAL; | |
8373 | break; | |
8374 | } | |
4e0377a1 | 8375 | if (fd == IORING_REGISTER_FILES_SKIP) |
8376 | continue; | |
8377 | ||
67973b93 | 8378 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8379 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8380 | |
a04b0ac0 PB |
8381 | if (file_slot->file_ptr) { |
8382 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8383 | err = io_queue_rsrc_removal(data, up->offset + done, |
8384 | ctx->rsrc_node, file); | |
a5318d3c HD |
8385 | if (err) |
8386 | break; | |
a04b0ac0 | 8387 | file_slot->file_ptr = 0; |
05589553 | 8388 | needs_switch = true; |
c3a31e60 JA |
8389 | } |
8390 | if (fd != -1) { | |
c3a31e60 JA |
8391 | file = fget(fd); |
8392 | if (!file) { | |
8393 | err = -EBADF; | |
8394 | break; | |
8395 | } | |
8396 | /* | |
8397 | * Don't allow io_uring instances to be registered. If | |
8398 | * UNIX isn't enabled, then this causes a reference | |
8399 | * cycle and this instance can never get freed. If UNIX | |
8400 | * is enabled we'll handle it just fine, but there's | |
8401 | * still no point in allowing a ring fd as it doesn't | |
8402 | * support regular read/write anyway. | |
8403 | */ | |
8404 | if (file->f_op == &io_uring_fops) { | |
8405 | fput(file); | |
8406 | err = -EBADF; | |
8407 | break; | |
8408 | } | |
2d091d62 | 8409 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8410 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8411 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8412 | if (err) { |
a04b0ac0 | 8413 | file_slot->file_ptr = 0; |
f3bd9dae | 8414 | fput(file); |
c3a31e60 | 8415 | break; |
f3bd9dae | 8416 | } |
c3a31e60 | 8417 | } |
05f3fb3c JA |
8418 | } |
8419 | ||
a7f0ed5a PB |
8420 | if (needs_switch) |
8421 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8422 | return done ? done : err; |
8423 | } | |
05589553 | 8424 | |
685fe7fe JA |
8425 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8426 | struct task_struct *task) | |
24369c2e | 8427 | { |
e941894e | 8428 | struct io_wq_hash *hash; |
24369c2e | 8429 | struct io_wq_data data; |
24369c2e | 8430 | unsigned int concurrency; |
24369c2e | 8431 | |
362a9e65 | 8432 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8433 | hash = ctx->hash_map; |
8434 | if (!hash) { | |
8435 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8436 | if (!hash) { |
8437 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8438 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8439 | } |
e941894e JA |
8440 | refcount_set(&hash->refs, 1); |
8441 | init_waitqueue_head(&hash->wait); | |
8442 | ctx->hash_map = hash; | |
24369c2e | 8443 | } |
362a9e65 | 8444 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8445 | |
e941894e | 8446 | data.hash = hash; |
685fe7fe | 8447 | data.task = task; |
ebc11b6c | 8448 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8449 | data.do_work = io_wq_submit_work; |
24369c2e | 8450 | |
d25e3a3d JA |
8451 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8452 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8453 | |
5aa75ed5 | 8454 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8455 | } |
8456 | ||
5aa75ed5 JA |
8457 | static int io_uring_alloc_task_context(struct task_struct *task, |
8458 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8459 | { |
8460 | struct io_uring_task *tctx; | |
d8a6df10 | 8461 | int ret; |
0f212204 | 8462 | |
09899b19 | 8463 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8464 | if (unlikely(!tctx)) |
8465 | return -ENOMEM; | |
8466 | ||
d8a6df10 JA |
8467 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8468 | if (unlikely(ret)) { | |
8469 | kfree(tctx); | |
8470 | return ret; | |
8471 | } | |
8472 | ||
685fe7fe | 8473 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8474 | if (IS_ERR(tctx->io_wq)) { |
8475 | ret = PTR_ERR(tctx->io_wq); | |
8476 | percpu_counter_destroy(&tctx->inflight); | |
8477 | kfree(tctx); | |
8478 | return ret; | |
8479 | } | |
8480 | ||
0f212204 JA |
8481 | xa_init(&tctx->xa); |
8482 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8483 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8484 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8485 | task->io_uring = tctx; |
7cbf1722 JA |
8486 | spin_lock_init(&tctx->task_lock); |
8487 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8488 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8489 | return 0; |
8490 | } | |
8491 | ||
8492 | void __io_uring_free(struct task_struct *tsk) | |
8493 | { | |
8494 | struct io_uring_task *tctx = tsk->io_uring; | |
8495 | ||
8496 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8497 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8498 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8499 | |
d8a6df10 | 8500 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8501 | kfree(tctx); |
8502 | tsk->io_uring = NULL; | |
8503 | } | |
8504 | ||
7e84e1c7 SG |
8505 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8506 | struct io_uring_params *p) | |
2b188cc1 JA |
8507 | { |
8508 | int ret; | |
8509 | ||
d25e3a3d JA |
8510 | /* Retain compatibility with failing for an invalid attach attempt */ |
8511 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8512 | IORING_SETUP_ATTACH_WQ) { | |
8513 | struct fd f; | |
8514 | ||
8515 | f = fdget(p->wq_fd); | |
8516 | if (!f.file) | |
8517 | return -ENXIO; | |
0cc936f7 JA |
8518 | if (f.file->f_op != &io_uring_fops) { |
8519 | fdput(f); | |
f2a48dd0 | 8520 | return -EINVAL; |
0cc936f7 JA |
8521 | } |
8522 | fdput(f); | |
d25e3a3d | 8523 | } |
6c271ce2 | 8524 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8525 | struct task_struct *tsk; |
534ca6d6 | 8526 | struct io_sq_data *sqd; |
26984fbf | 8527 | bool attached; |
534ca6d6 | 8528 | |
26984fbf | 8529 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8530 | if (IS_ERR(sqd)) { |
8531 | ret = PTR_ERR(sqd); | |
8532 | goto err; | |
8533 | } | |
69fb2131 | 8534 | |
7c30f36a | 8535 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8536 | ctx->sq_data = sqd; |
917257da JA |
8537 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8538 | if (!ctx->sq_thread_idle) | |
8539 | ctx->sq_thread_idle = HZ; | |
8540 | ||
78d7f6ba | 8541 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8542 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8543 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8544 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8545 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8546 | io_sq_thread_unpark(sqd); |
8547 | ||
de75a3d3 PB |
8548 | if (ret < 0) |
8549 | goto err; | |
8550 | if (attached) | |
5aa75ed5 | 8551 | return 0; |
aa06165d | 8552 | |
6c271ce2 | 8553 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8554 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8555 | |
917257da | 8556 | ret = -EINVAL; |
f2a48dd0 | 8557 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8558 | goto err_sqpoll; |
37d1e2e3 | 8559 | sqd->sq_cpu = cpu; |
6c271ce2 | 8560 | } else { |
37d1e2e3 | 8561 | sqd->sq_cpu = -1; |
6c271ce2 | 8562 | } |
37d1e2e3 JA |
8563 | |
8564 | sqd->task_pid = current->pid; | |
5c2469e0 | 8565 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8566 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8567 | if (IS_ERR(tsk)) { | |
8568 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8569 | goto err_sqpoll; |
6c271ce2 | 8570 | } |
97a73a0f | 8571 | |
46fe18b1 | 8572 | sqd->thread = tsk; |
97a73a0f | 8573 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8574 | wake_up_new_task(tsk); |
0f212204 JA |
8575 | if (ret) |
8576 | goto err; | |
6c271ce2 JA |
8577 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8578 | /* Can't have SQ_AFF without SQPOLL */ | |
8579 | ret = -EINVAL; | |
8580 | goto err; | |
8581 | } | |
8582 | ||
2b188cc1 | 8583 | return 0; |
f2a48dd0 PB |
8584 | err_sqpoll: |
8585 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8586 | err: |
37d1e2e3 | 8587 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8588 | return ret; |
8589 | } | |
8590 | ||
a087e2b5 BM |
8591 | static inline void __io_unaccount_mem(struct user_struct *user, |
8592 | unsigned long nr_pages) | |
2b188cc1 JA |
8593 | { |
8594 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8595 | } | |
8596 | ||
a087e2b5 BM |
8597 | static inline int __io_account_mem(struct user_struct *user, |
8598 | unsigned long nr_pages) | |
2b188cc1 JA |
8599 | { |
8600 | unsigned long page_limit, cur_pages, new_pages; | |
8601 | ||
8602 | /* Don't allow more pages than we can safely lock */ | |
8603 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8604 | ||
8605 | do { | |
8606 | cur_pages = atomic_long_read(&user->locked_vm); | |
8607 | new_pages = cur_pages + nr_pages; | |
8608 | if (new_pages > page_limit) | |
8609 | return -ENOMEM; | |
8610 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8611 | new_pages) != cur_pages); | |
8612 | ||
8613 | return 0; | |
8614 | } | |
8615 | ||
26bfa89e | 8616 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8617 | { |
62e398be | 8618 | if (ctx->user) |
a087e2b5 | 8619 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8620 | |
26bfa89e JA |
8621 | if (ctx->mm_account) |
8622 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8623 | } |
8624 | ||
26bfa89e | 8625 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8626 | { |
30975825 BM |
8627 | int ret; |
8628 | ||
62e398be | 8629 | if (ctx->user) { |
30975825 BM |
8630 | ret = __io_account_mem(ctx->user, nr_pages); |
8631 | if (ret) | |
8632 | return ret; | |
8633 | } | |
8634 | ||
26bfa89e JA |
8635 | if (ctx->mm_account) |
8636 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8637 | |
8638 | return 0; | |
8639 | } | |
8640 | ||
2b188cc1 JA |
8641 | static void io_mem_free(void *ptr) |
8642 | { | |
52e04ef4 MR |
8643 | struct page *page; |
8644 | ||
8645 | if (!ptr) | |
8646 | return; | |
2b188cc1 | 8647 | |
52e04ef4 | 8648 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8649 | if (put_page_testzero(page)) |
8650 | free_compound_page(page); | |
8651 | } | |
8652 | ||
8653 | static void *io_mem_alloc(size_t size) | |
8654 | { | |
8655 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8656 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8657 | |
8658 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8659 | } | |
8660 | ||
75b28aff HV |
8661 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8662 | size_t *sq_offset) | |
8663 | { | |
8664 | struct io_rings *rings; | |
8665 | size_t off, sq_array_size; | |
8666 | ||
8667 | off = struct_size(rings, cqes, cq_entries); | |
8668 | if (off == SIZE_MAX) | |
8669 | return SIZE_MAX; | |
8670 | ||
8671 | #ifdef CONFIG_SMP | |
8672 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8673 | if (off == 0) | |
8674 | return SIZE_MAX; | |
8675 | #endif | |
8676 | ||
b36200f5 DV |
8677 | if (sq_offset) |
8678 | *sq_offset = off; | |
8679 | ||
75b28aff HV |
8680 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8681 | if (sq_array_size == SIZE_MAX) | |
8682 | return SIZE_MAX; | |
8683 | ||
8684 | if (check_add_overflow(off, sq_array_size, &off)) | |
8685 | return SIZE_MAX; | |
8686 | ||
75b28aff HV |
8687 | return off; |
8688 | } | |
8689 | ||
41edf1a5 | 8690 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8691 | { |
41edf1a5 | 8692 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8693 | unsigned int i; |
8694 | ||
6224843d PB |
8695 | if (imu != ctx->dummy_ubuf) { |
8696 | for (i = 0; i < imu->nr_bvecs; i++) | |
8697 | unpin_user_page(imu->bvec[i].bv_page); | |
8698 | if (imu->acct_pages) | |
8699 | io_unaccount_mem(ctx, imu->acct_pages); | |
8700 | kvfree(imu); | |
8701 | } | |
41edf1a5 | 8702 | *slot = NULL; |
7f61a1e9 PB |
8703 | } |
8704 | ||
bd54b6fe | 8705 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8706 | { |
634d00df PB |
8707 | io_buffer_unmap(ctx, &prsrc->buf); |
8708 | prsrc->buf = NULL; | |
bd54b6fe | 8709 | } |
edafccee | 8710 | |
bd54b6fe BM |
8711 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8712 | { | |
8713 | unsigned int i; | |
edafccee | 8714 | |
7f61a1e9 PB |
8715 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8716 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8717 | kfree(ctx->user_bufs); |
bb6659cc | 8718 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8719 | ctx->user_bufs = NULL; |
bd54b6fe | 8720 | ctx->buf_data = NULL; |
edafccee | 8721 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8722 | } |
8723 | ||
0a96bbe4 | 8724 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8725 | { |
bd54b6fe | 8726 | int ret; |
edafccee | 8727 | |
bd54b6fe | 8728 | if (!ctx->buf_data) |
edafccee JA |
8729 | return -ENXIO; |
8730 | ||
bd54b6fe BM |
8731 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8732 | if (!ret) | |
8733 | __io_sqe_buffers_unregister(ctx); | |
8734 | return ret; | |
edafccee JA |
8735 | } |
8736 | ||
8737 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8738 | void __user *arg, unsigned index) | |
8739 | { | |
8740 | struct iovec __user *src; | |
8741 | ||
8742 | #ifdef CONFIG_COMPAT | |
8743 | if (ctx->compat) { | |
8744 | struct compat_iovec __user *ciovs; | |
8745 | struct compat_iovec ciov; | |
8746 | ||
8747 | ciovs = (struct compat_iovec __user *) arg; | |
8748 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8749 | return -EFAULT; | |
8750 | ||
d55e5f5b | 8751 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8752 | dst->iov_len = ciov.iov_len; |
8753 | return 0; | |
8754 | } | |
8755 | #endif | |
8756 | src = (struct iovec __user *) arg; | |
8757 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8758 | return -EFAULT; | |
8759 | return 0; | |
8760 | } | |
8761 | ||
de293938 JA |
8762 | /* |
8763 | * Not super efficient, but this is just a registration time. And we do cache | |
8764 | * the last compound head, so generally we'll only do a full search if we don't | |
8765 | * match that one. | |
8766 | * | |
8767 | * We check if the given compound head page has already been accounted, to | |
8768 | * avoid double accounting it. This allows us to account the full size of the | |
8769 | * page, not just the constituent pages of a huge page. | |
8770 | */ | |
8771 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8772 | int nr_pages, struct page *hpage) | |
8773 | { | |
8774 | int i, j; | |
8775 | ||
8776 | /* check current page array */ | |
8777 | for (i = 0; i < nr_pages; i++) { | |
8778 | if (!PageCompound(pages[i])) | |
8779 | continue; | |
8780 | if (compound_head(pages[i]) == hpage) | |
8781 | return true; | |
8782 | } | |
8783 | ||
8784 | /* check previously registered pages */ | |
8785 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8786 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8787 | |
8788 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8789 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8790 | continue; | |
8791 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8792 | return true; | |
8793 | } | |
8794 | } | |
8795 | ||
8796 | return false; | |
8797 | } | |
8798 | ||
8799 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8800 | int nr_pages, struct io_mapped_ubuf *imu, | |
8801 | struct page **last_hpage) | |
8802 | { | |
8803 | int i, ret; | |
8804 | ||
216e5835 | 8805 | imu->acct_pages = 0; |
de293938 JA |
8806 | for (i = 0; i < nr_pages; i++) { |
8807 | if (!PageCompound(pages[i])) { | |
8808 | imu->acct_pages++; | |
8809 | } else { | |
8810 | struct page *hpage; | |
8811 | ||
8812 | hpage = compound_head(pages[i]); | |
8813 | if (hpage == *last_hpage) | |
8814 | continue; | |
8815 | *last_hpage = hpage; | |
8816 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8817 | continue; | |
8818 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8819 | } | |
8820 | } | |
8821 | ||
8822 | if (!imu->acct_pages) | |
8823 | return 0; | |
8824 | ||
26bfa89e | 8825 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8826 | if (ret) |
8827 | imu->acct_pages = 0; | |
8828 | return ret; | |
8829 | } | |
8830 | ||
0a96bbe4 | 8831 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8832 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8833 | struct page **last_hpage) |
edafccee | 8834 | { |
41edf1a5 | 8835 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8836 | struct vm_area_struct **vmas = NULL; |
8837 | struct page **pages = NULL; | |
0a96bbe4 BM |
8838 | unsigned long off, start, end, ubuf; |
8839 | size_t size; | |
8840 | int ret, pret, nr_pages, i; | |
8841 | ||
6224843d PB |
8842 | if (!iov->iov_base) { |
8843 | *pimu = ctx->dummy_ubuf; | |
8844 | return 0; | |
8845 | } | |
8846 | ||
0a96bbe4 BM |
8847 | ubuf = (unsigned long) iov->iov_base; |
8848 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8849 | start = ubuf >> PAGE_SHIFT; | |
8850 | nr_pages = end - start; | |
8851 | ||
41edf1a5 | 8852 | *pimu = NULL; |
0a96bbe4 BM |
8853 | ret = -ENOMEM; |
8854 | ||
8855 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8856 | if (!pages) | |
8857 | goto done; | |
8858 | ||
8859 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8860 | GFP_KERNEL); | |
8861 | if (!vmas) | |
8862 | goto done; | |
edafccee | 8863 | |
41edf1a5 | 8864 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8865 | if (!imu) |
0a96bbe4 BM |
8866 | goto done; |
8867 | ||
8868 | ret = 0; | |
8869 | mmap_read_lock(current->mm); | |
8870 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8871 | pages, vmas); | |
8872 | if (pret == nr_pages) { | |
8873 | /* don't support file backed memory */ | |
8874 | for (i = 0; i < nr_pages; i++) { | |
8875 | struct vm_area_struct *vma = vmas[i]; | |
8876 | ||
40dad765 PB |
8877 | if (vma_is_shmem(vma)) |
8878 | continue; | |
0a96bbe4 BM |
8879 | if (vma->vm_file && |
8880 | !is_file_hugepages(vma->vm_file)) { | |
8881 | ret = -EOPNOTSUPP; | |
8882 | break; | |
8883 | } | |
8884 | } | |
8885 | } else { | |
8886 | ret = pret < 0 ? pret : -EFAULT; | |
8887 | } | |
8888 | mmap_read_unlock(current->mm); | |
8889 | if (ret) { | |
8890 | /* | |
8891 | * if we did partial map, or found file backed vmas, | |
8892 | * release any pages we did get | |
8893 | */ | |
8894 | if (pret > 0) | |
8895 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8896 | goto done; |
8897 | } | |
8898 | ||
8899 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8900 | if (ret) { | |
8901 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8902 | goto done; |
8903 | } | |
8904 | ||
8905 | off = ubuf & ~PAGE_MASK; | |
8906 | size = iov->iov_len; | |
8907 | for (i = 0; i < nr_pages; i++) { | |
8908 | size_t vec_len; | |
8909 | ||
8910 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8911 | imu->bvec[i].bv_page = pages[i]; | |
8912 | imu->bvec[i].bv_len = vec_len; | |
8913 | imu->bvec[i].bv_offset = off; | |
8914 | off = 0; | |
8915 | size -= vec_len; | |
8916 | } | |
8917 | /* store original address for later verification */ | |
8918 | imu->ubuf = ubuf; | |
4751f53d | 8919 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8920 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8921 | *pimu = imu; |
0a96bbe4 BM |
8922 | ret = 0; |
8923 | done: | |
41edf1a5 PB |
8924 | if (ret) |
8925 | kvfree(imu); | |
0a96bbe4 BM |
8926 | kvfree(pages); |
8927 | kvfree(vmas); | |
8928 | return ret; | |
8929 | } | |
8930 | ||
2b358604 | 8931 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8932 | { |
87094465 PB |
8933 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8934 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 8935 | } |
edafccee | 8936 | |
2b358604 BM |
8937 | static int io_buffer_validate(struct iovec *iov) |
8938 | { | |
50e96989 PB |
8939 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
8940 | ||
2b358604 BM |
8941 | /* |
8942 | * Don't impose further limits on the size and buffer | |
8943 | * constraints here, we'll -EINVAL later when IO is | |
8944 | * submitted if they are wrong. | |
8945 | */ | |
6224843d PB |
8946 | if (!iov->iov_base) |
8947 | return iov->iov_len ? -EFAULT : 0; | |
8948 | if (!iov->iov_len) | |
2b358604 | 8949 | return -EFAULT; |
edafccee | 8950 | |
2b358604 BM |
8951 | /* arbitrary limit, but we need something */ |
8952 | if (iov->iov_len > SZ_1G) | |
8953 | return -EFAULT; | |
edafccee | 8954 | |
50e96989 PB |
8955 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
8956 | return -EOVERFLOW; | |
8957 | ||
2b358604 BM |
8958 | return 0; |
8959 | } | |
edafccee | 8960 | |
2b358604 | 8961 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 8962 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 8963 | { |
bd54b6fe BM |
8964 | struct page *last_hpage = NULL; |
8965 | struct io_rsrc_data *data; | |
2b358604 BM |
8966 | int i, ret; |
8967 | struct iovec iov; | |
edafccee | 8968 | |
87094465 PB |
8969 | if (ctx->user_bufs) |
8970 | return -EBUSY; | |
489809e2 | 8971 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 8972 | return -EINVAL; |
bd54b6fe | 8973 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
8974 | if (ret) |
8975 | return ret; | |
d878c816 PB |
8976 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
8977 | if (ret) | |
8978 | return ret; | |
bd54b6fe BM |
8979 | ret = io_buffers_map_alloc(ctx, nr_args); |
8980 | if (ret) { | |
bb6659cc | 8981 | io_rsrc_data_free(data); |
bd54b6fe BM |
8982 | return ret; |
8983 | } | |
edafccee | 8984 | |
87094465 | 8985 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
8986 | ret = io_copy_iov(ctx, &iov, arg, i); |
8987 | if (ret) | |
0a96bbe4 | 8988 | break; |
2b358604 BM |
8989 | ret = io_buffer_validate(&iov); |
8990 | if (ret) | |
0a96bbe4 | 8991 | break; |
2d091d62 | 8992 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
8993 | ret = -EINVAL; |
8994 | break; | |
8995 | } | |
edafccee | 8996 | |
41edf1a5 PB |
8997 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
8998 | &last_hpage); | |
0a96bbe4 BM |
8999 | if (ret) |
9000 | break; | |
edafccee | 9001 | } |
0a96bbe4 | 9002 | |
bd54b6fe | 9003 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9004 | |
bd54b6fe BM |
9005 | ctx->buf_data = data; |
9006 | if (ret) | |
9007 | __io_sqe_buffers_unregister(ctx); | |
9008 | else | |
9009 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9010 | return ret; |
9011 | } | |
9012 | ||
634d00df PB |
9013 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9014 | struct io_uring_rsrc_update2 *up, | |
9015 | unsigned int nr_args) | |
9016 | { | |
9017 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9018 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9019 | struct page *last_hpage = NULL; |
9020 | bool needs_switch = false; | |
9021 | __u32 done; | |
9022 | int i, err; | |
9023 | ||
9024 | if (!ctx->buf_data) | |
9025 | return -ENXIO; | |
9026 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9027 | return -EINVAL; | |
9028 | ||
9029 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9030 | struct io_mapped_ubuf *imu; |
9031 | int offset = up->offset + done; | |
634d00df PB |
9032 | u64 tag = 0; |
9033 | ||
9034 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9035 | if (err) | |
9036 | break; | |
9037 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9038 | err = -EFAULT; | |
9039 | break; | |
9040 | } | |
0b8c0e7c PB |
9041 | err = io_buffer_validate(&iov); |
9042 | if (err) | |
9043 | break; | |
cf3770e7 CIK |
9044 | if (!iov.iov_base && tag) { |
9045 | err = -EINVAL; | |
9046 | break; | |
9047 | } | |
0b8c0e7c PB |
9048 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9049 | if (err) | |
9050 | break; | |
634d00df | 9051 | |
0b8c0e7c | 9052 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9053 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9054 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9055 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9056 | if (unlikely(err)) { | |
9057 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9058 | break; |
0b8c0e7c | 9059 | } |
634d00df PB |
9060 | ctx->user_bufs[i] = NULL; |
9061 | needs_switch = true; | |
9062 | } | |
9063 | ||
0b8c0e7c | 9064 | ctx->user_bufs[i] = imu; |
2d091d62 | 9065 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9066 | } |
9067 | ||
9068 | if (needs_switch) | |
9069 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9070 | return done ? done : err; | |
9071 | } | |
9072 | ||
9b402849 JA |
9073 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9074 | { | |
9075 | __s32 __user *fds = arg; | |
9076 | int fd; | |
9077 | ||
9078 | if (ctx->cq_ev_fd) | |
9079 | return -EBUSY; | |
9080 | ||
9081 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9082 | return -EFAULT; | |
9083 | ||
9084 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9085 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9086 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9087 | |
9b402849 JA |
9088 | ctx->cq_ev_fd = NULL; |
9089 | return ret; | |
9090 | } | |
9091 | ||
9092 | return 0; | |
9093 | } | |
9094 | ||
9095 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9096 | { | |
9097 | if (ctx->cq_ev_fd) { | |
9098 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9099 | ctx->cq_ev_fd = NULL; | |
9100 | return 0; | |
9101 | } | |
9102 | ||
9103 | return -ENXIO; | |
9104 | } | |
9105 | ||
5a2e745d JA |
9106 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9107 | { | |
9e15c3a0 JA |
9108 | struct io_buffer *buf; |
9109 | unsigned long index; | |
9110 | ||
9111 | xa_for_each(&ctx->io_buffers, index, buf) | |
9112 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
9113 | } |
9114 | ||
7255834e | 9115 | static void io_req_cache_free(struct list_head *list) |
1b4c351f | 9116 | { |
68e68ee6 | 9117 | struct io_kiocb *req, *nxt; |
1b4c351f | 9118 | |
bb943b82 PB |
9119 | list_for_each_entry_safe(req, nxt, list, inflight_entry) { |
9120 | list_del(&req->inflight_entry); | |
1b4c351f JA |
9121 | kmem_cache_free(req_cachep, req); |
9122 | } | |
9123 | } | |
9124 | ||
4010fec4 | 9125 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9126 | { |
cd0ca2e0 | 9127 | struct io_submit_state *state = &ctx->submit_state; |
bf019da7 | 9128 | |
9a4fdbd8 JA |
9129 | mutex_lock(&ctx->uring_lock); |
9130 | ||
cd0ca2e0 PB |
9131 | if (state->free_reqs) { |
9132 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); | |
9133 | state->free_reqs = 0; | |
8e5c66c4 | 9134 | } |
9a4fdbd8 | 9135 | |
cd0ca2e0 PB |
9136 | io_flush_cached_locked_reqs(ctx, state); |
9137 | io_req_cache_free(&state->free_list); | |
9a4fdbd8 JA |
9138 | mutex_unlock(&ctx->uring_lock); |
9139 | } | |
9140 | ||
43597aac | 9141 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9142 | { |
43597aac | 9143 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9144 | wait_for_completion(&data->done); |
bd54b6fe | 9145 | } |
04fc6c80 | 9146 | |
2b188cc1 JA |
9147 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
9148 | { | |
37d1e2e3 | 9149 | io_sq_thread_finish(ctx); |
2aede0e4 | 9150 | |
37d1e2e3 | 9151 | if (ctx->mm_account) { |
2aede0e4 JA |
9152 | mmdrop(ctx->mm_account); |
9153 | ctx->mm_account = NULL; | |
30975825 | 9154 | } |
def596e9 | 9155 | |
43597aac PB |
9156 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9157 | io_wait_rsrc_data(ctx->buf_data); | |
9158 | io_wait_rsrc_data(ctx->file_data); | |
9159 | ||
8bad28d8 | 9160 | mutex_lock(&ctx->uring_lock); |
43597aac | 9161 | if (ctx->buf_data) |
bd54b6fe | 9162 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9163 | if (ctx->file_data) |
08480400 | 9164 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9165 | if (ctx->rings) |
9166 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9167 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9168 | io_eventfd_unregister(ctx); |
5a2e745d | 9169 | io_destroy_buffers(ctx); |
07db298a PB |
9170 | if (ctx->sq_creds) |
9171 | put_cred(ctx->sq_creds); | |
def596e9 | 9172 | |
a7f0ed5a PB |
9173 | /* there are no registered resources left, nobody uses it */ |
9174 | if (ctx->rsrc_node) | |
9175 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9176 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9177 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
9178 | flush_delayed_work(&ctx->rsrc_put_work); |
9179 | ||
9180 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9181 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9182 | |
2b188cc1 | 9183 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9184 | if (ctx->ring_sock) { |
9185 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9186 | sock_release(ctx->ring_sock); |
355e8d26 | 9187 | } |
2b188cc1 | 9188 | #endif |
ef9dd637 | 9189 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9190 | |
75b28aff | 9191 | io_mem_free(ctx->rings); |
2b188cc1 | 9192 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9193 | |
9194 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9195 | free_uid(ctx->user); |
4010fec4 | 9196 | io_req_caches_free(ctx); |
e941894e JA |
9197 | if (ctx->hash_map) |
9198 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9199 | kfree(ctx->cancel_hash); |
6224843d | 9200 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9201 | kfree(ctx); |
9202 | } | |
9203 | ||
9204 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9205 | { | |
9206 | struct io_ring_ctx *ctx = file->private_data; | |
9207 | __poll_t mask = 0; | |
9208 | ||
311997b3 | 9209 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
9210 | /* |
9211 | * synchronizes with barrier from wq_has_sleeper call in | |
9212 | * io_commit_cqring | |
9213 | */ | |
2b188cc1 | 9214 | smp_rmb(); |
90554200 | 9215 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9216 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9217 | |
9218 | /* | |
9219 | * Don't flush cqring overflow list here, just do a simple check. | |
9220 | * Otherwise there could possible be ABBA deadlock: | |
9221 | * CPU0 CPU1 | |
9222 | * ---- ---- | |
9223 | * lock(&ctx->uring_lock); | |
9224 | * lock(&ep->mtx); | |
9225 | * lock(&ctx->uring_lock); | |
9226 | * lock(&ep->mtx); | |
9227 | * | |
9228 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9229 | * pushs them to do the flush. | |
9230 | */ | |
5ed7a37d | 9231 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9232 | mask |= EPOLLIN | EPOLLRDNORM; |
9233 | ||
9234 | return mask; | |
9235 | } | |
9236 | ||
9237 | static int io_uring_fasync(int fd, struct file *file, int on) | |
9238 | { | |
9239 | struct io_ring_ctx *ctx = file->private_data; | |
9240 | ||
9241 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
9242 | } | |
9243 | ||
0bead8cd | 9244 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9245 | { |
4379bf8b | 9246 | const struct cred *creds; |
071698e1 | 9247 | |
61cf9370 | 9248 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9249 | if (creds) { |
9250 | put_cred(creds); | |
0bead8cd | 9251 | return 0; |
1e6fa521 | 9252 | } |
0bead8cd YD |
9253 | |
9254 | return -EINVAL; | |
9255 | } | |
9256 | ||
d56d938b PB |
9257 | struct io_tctx_exit { |
9258 | struct callback_head task_work; | |
9259 | struct completion completion; | |
baf186c4 | 9260 | struct io_ring_ctx *ctx; |
d56d938b PB |
9261 | }; |
9262 | ||
9263 | static void io_tctx_exit_cb(struct callback_head *cb) | |
9264 | { | |
9265 | struct io_uring_task *tctx = current->io_uring; | |
9266 | struct io_tctx_exit *work; | |
9267 | ||
9268 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9269 | /* | |
9270 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9271 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9272 | */ | |
9273 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9274 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9275 | complete(&work->completion); |
9276 | } | |
9277 | ||
28090c13 PB |
9278 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
9279 | { | |
9280 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9281 | ||
9282 | return req->ctx == data; | |
9283 | } | |
9284 | ||
85faa7b8 JA |
9285 | static void io_ring_exit_work(struct work_struct *work) |
9286 | { | |
d56d938b | 9287 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9288 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9289 | unsigned long interval = HZ / 20; |
d56d938b PB |
9290 | struct io_tctx_exit exit; |
9291 | struct io_tctx_node *node; | |
9292 | int ret; | |
85faa7b8 | 9293 | |
56952e91 JA |
9294 | /* |
9295 | * If we're doing polled IO and end up having requests being | |
9296 | * submitted async (out-of-line), then completions can come in while | |
9297 | * we're waiting for refs to drop. We need to reap these manually, | |
9298 | * as nobody else will be looking for them. | |
9299 | */ | |
b2edc0a7 | 9300 | do { |
3dd0c97a | 9301 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9302 | if (ctx->sq_data) { |
9303 | struct io_sq_data *sqd = ctx->sq_data; | |
9304 | struct task_struct *tsk; | |
9305 | ||
9306 | io_sq_thread_park(sqd); | |
9307 | tsk = sqd->thread; | |
9308 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9309 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9310 | io_cancel_ctx_cb, ctx, true); | |
9311 | io_sq_thread_unpark(sqd); | |
9312 | } | |
b5bb3a24 | 9313 | |
58d3be2c PB |
9314 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9315 | /* there is little hope left, don't run it too often */ | |
9316 | interval = HZ * 60; | |
9317 | } | |
9318 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9319 | |
7f00651a PB |
9320 | init_completion(&exit.completion); |
9321 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9322 | exit.ctx = ctx; | |
89b5066e PB |
9323 | /* |
9324 | * Some may use context even when all refs and requests have been put, | |
9325 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9326 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9327 | * this lock/unlock section also waits them to finish. |
9328 | */ | |
d56d938b PB |
9329 | mutex_lock(&ctx->uring_lock); |
9330 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9331 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9332 | ||
d56d938b PB |
9333 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9334 | ctx_node); | |
7f00651a PB |
9335 | /* don't spin on a single task if cancellation failed */ |
9336 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9337 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9338 | if (WARN_ON_ONCE(ret)) | |
9339 | continue; | |
9340 | wake_up_process(node->task); | |
9341 | ||
9342 | mutex_unlock(&ctx->uring_lock); | |
9343 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9344 | mutex_lock(&ctx->uring_lock); |
9345 | } | |
9346 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9347 | spin_lock(&ctx->completion_lock); |
9348 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9349 | |
85faa7b8 JA |
9350 | io_ring_ctx_free(ctx); |
9351 | } | |
9352 | ||
80c4cbdb PB |
9353 | /* Returns true if we found and killed one or more timeouts */ |
9354 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 9355 | bool cancel_all) |
80c4cbdb PB |
9356 | { |
9357 | struct io_kiocb *req, *tmp; | |
9358 | int canceled = 0; | |
9359 | ||
79ebeaee JA |
9360 | spin_lock(&ctx->completion_lock); |
9361 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9362 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9363 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9364 | io_kill_timeout(req, -ECANCELED); |
9365 | canceled++; | |
9366 | } | |
9367 | } | |
79ebeaee | 9368 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9369 | if (canceled != 0) |
9370 | io_commit_cqring(ctx); | |
79ebeaee | 9371 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9372 | if (canceled != 0) |
9373 | io_cqring_ev_posted(ctx); | |
9374 | return canceled != 0; | |
9375 | } | |
9376 | ||
2b188cc1 JA |
9377 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
9378 | { | |
61cf9370 MWO |
9379 | unsigned long index; |
9380 | struct creds *creds; | |
9381 | ||
2b188cc1 JA |
9382 | mutex_lock(&ctx->uring_lock); |
9383 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9384 | if (ctx->rings) |
6c2450ae | 9385 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9386 | xa_for_each(&ctx->personalities, index, creds) |
9387 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9388 | mutex_unlock(&ctx->uring_lock); |
9389 | ||
3dd0c97a PB |
9390 | io_kill_timeouts(ctx, NULL, true); |
9391 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9392 | |
15dff286 | 9393 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9394 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9395 | |
85faa7b8 | 9396 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9397 | /* |
9398 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9399 | * if we're exiting a ton of rings at the same time. It just adds | |
9400 | * noise and overhead, there's no discernable change in runtime | |
9401 | * over using system_wq. | |
9402 | */ | |
9403 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9404 | } |
9405 | ||
9406 | static int io_uring_release(struct inode *inode, struct file *file) | |
9407 | { | |
9408 | struct io_ring_ctx *ctx = file->private_data; | |
9409 | ||
9410 | file->private_data = NULL; | |
9411 | io_ring_ctx_wait_and_kill(ctx); | |
9412 | return 0; | |
9413 | } | |
9414 | ||
f6edbabb PB |
9415 | struct io_task_cancel { |
9416 | struct task_struct *task; | |
3dd0c97a | 9417 | bool all; |
f6edbabb | 9418 | }; |
f254ac04 | 9419 | |
f6edbabb | 9420 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9421 | { |
9a472ef7 | 9422 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9423 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9424 | bool ret; |
9425 | ||
3dd0c97a | 9426 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9427 | struct io_ring_ctx *ctx = req->ctx; |
9428 | ||
9429 | /* protect against races with linked timeouts */ | |
79ebeaee | 9430 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9431 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9432 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9433 | } else { |
3dd0c97a | 9434 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9435 | } |
9436 | return ret; | |
b711d4ea JA |
9437 | } |
9438 | ||
e1915f76 | 9439 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 9440 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 9441 | { |
e1915f76 | 9442 | struct io_defer_entry *de; |
b7ddce3c PB |
9443 | LIST_HEAD(list); |
9444 | ||
79ebeaee | 9445 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9446 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9447 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9448 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9449 | break; | |
9450 | } | |
9451 | } | |
79ebeaee | 9452 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9453 | if (list_empty(&list)) |
9454 | return false; | |
b7ddce3c PB |
9455 | |
9456 | while (!list_empty(&list)) { | |
9457 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9458 | list_del_init(&de->list); | |
f41db273 | 9459 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9460 | kfree(de); |
9461 | } | |
e1915f76 | 9462 | return true; |
b7ddce3c PB |
9463 | } |
9464 | ||
1b00764f PB |
9465 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
9466 | { | |
9467 | struct io_tctx_node *node; | |
9468 | enum io_wq_cancel cret; | |
9469 | bool ret = false; | |
9470 | ||
9471 | mutex_lock(&ctx->uring_lock); | |
9472 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9473 | struct io_uring_task *tctx = node->task->io_uring; | |
9474 | ||
9475 | /* | |
9476 | * io_wq will stay alive while we hold uring_lock, because it's | |
9477 | * killed after ctx nodes, which requires to take the lock. | |
9478 | */ | |
9479 | if (!tctx || !tctx->io_wq) | |
9480 | continue; | |
9481 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9482 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9483 | } | |
9484 | mutex_unlock(&ctx->uring_lock); | |
9485 | ||
9486 | return ret; | |
9487 | } | |
9488 | ||
9936c7c2 PB |
9489 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9490 | struct task_struct *task, | |
3dd0c97a | 9491 | bool cancel_all) |
9936c7c2 | 9492 | { |
3dd0c97a | 9493 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9494 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9495 | |
9496 | while (1) { | |
9497 | enum io_wq_cancel cret; | |
9498 | bool ret = false; | |
9499 | ||
1b00764f PB |
9500 | if (!task) { |
9501 | ret |= io_uring_try_cancel_iowq(ctx); | |
9502 | } else if (tctx && tctx->io_wq) { | |
9503 | /* | |
9504 | * Cancels requests of all rings, not only @ctx, but | |
9505 | * it's fine as the task is in exit/exec. | |
9506 | */ | |
5aa75ed5 | 9507 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9508 | &cancel, true); |
9509 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9510 | } | |
9511 | ||
9512 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9513 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9514 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9515 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9516 | io_iopoll_try_reap_events(ctx); | |
9517 | ret = true; | |
9518 | } | |
9519 | } | |
9520 | ||
3dd0c97a PB |
9521 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9522 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9523 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9524 | if (task) |
9525 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9526 | if (!ret) |
9527 | break; | |
9528 | cond_resched(); | |
9529 | } | |
9530 | } | |
9531 | ||
eef51daa | 9532 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9533 | { |
236434c3 | 9534 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9535 | struct io_tctx_node *node; |
a528b04e | 9536 | int ret; |
236434c3 MWO |
9537 | |
9538 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9539 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9540 | if (unlikely(ret)) |
9541 | return ret; | |
236434c3 | 9542 | tctx = current->io_uring; |
0f212204 | 9543 | } |
cf27f3b1 PB |
9544 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9545 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9546 | if (!node) | |
9547 | return -ENOMEM; | |
9548 | node->ctx = ctx; | |
9549 | node->task = current; | |
13bf43f5 | 9550 | |
cf27f3b1 PB |
9551 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9552 | node, GFP_KERNEL)); | |
9553 | if (ret) { | |
9554 | kfree(node); | |
9555 | return ret; | |
0f212204 | 9556 | } |
cf27f3b1 PB |
9557 | |
9558 | mutex_lock(&ctx->uring_lock); | |
9559 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9560 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9561 | } |
cf27f3b1 | 9562 | tctx->last = ctx; |
0f212204 JA |
9563 | return 0; |
9564 | } | |
9565 | ||
cf27f3b1 PB |
9566 | /* |
9567 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9568 | */ | |
eef51daa | 9569 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9570 | { |
9571 | struct io_uring_task *tctx = current->io_uring; | |
9572 | ||
9573 | if (likely(tctx && tctx->last == ctx)) | |
9574 | return 0; | |
eef51daa | 9575 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9576 | } |
9577 | ||
0f212204 JA |
9578 | /* |
9579 | * Remove this io_uring_file -> task mapping. | |
9580 | */ | |
eef51daa | 9581 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9582 | { |
9583 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9584 | struct io_tctx_node *node; |
2941267b | 9585 | |
eebd2e37 PB |
9586 | if (!tctx) |
9587 | return; | |
13bf43f5 PB |
9588 | node = xa_erase(&tctx->xa, index); |
9589 | if (!node) | |
2941267b | 9590 | return; |
0f212204 | 9591 | |
13bf43f5 PB |
9592 | WARN_ON_ONCE(current != node->task); |
9593 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9594 | ||
9595 | mutex_lock(&node->ctx->uring_lock); | |
9596 | list_del(&node->ctx_node); | |
9597 | mutex_unlock(&node->ctx->uring_lock); | |
9598 | ||
baf186c4 | 9599 | if (tctx->last == node->ctx) |
0f212204 | 9600 | tctx->last = NULL; |
13bf43f5 | 9601 | kfree(node); |
0f212204 JA |
9602 | } |
9603 | ||
8452d4a6 | 9604 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9605 | { |
ba5ef6dc | 9606 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9607 | struct io_tctx_node *node; |
de7f1d9e PB |
9608 | unsigned long index; |
9609 | ||
13bf43f5 | 9610 | xa_for_each(&tctx->xa, index, node) |
eef51daa | 9611 | io_uring_del_tctx_node(index); |
b16ef427 ME |
9612 | if (wq) { |
9613 | /* | |
9614 | * Must be after io_uring_del_task_file() (removes nodes under | |
9615 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9616 | */ | |
ba5ef6dc | 9617 | io_wq_put_and_exit(wq); |
dadebc35 | 9618 | tctx->io_wq = NULL; |
b16ef427 | 9619 | } |
de7f1d9e PB |
9620 | } |
9621 | ||
3f48cf18 | 9622 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9623 | { |
3f48cf18 PB |
9624 | if (tracked) |
9625 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9626 | return percpu_counter_sum(&tctx->inflight); |
9627 | } | |
9628 | ||
09899b19 PB |
9629 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9630 | { | |
9631 | struct io_uring_task *tctx = task->io_uring; | |
9632 | unsigned int refs = tctx->cached_refs; | |
9633 | ||
e9dbe221 PB |
9634 | if (refs) { |
9635 | tctx->cached_refs = 0; | |
9636 | percpu_counter_sub(&tctx->inflight, refs); | |
9637 | put_task_struct_many(task, refs); | |
9638 | } | |
09899b19 PB |
9639 | } |
9640 | ||
78cc687b PB |
9641 | /* |
9642 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9643 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9644 | */ | |
9645 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9646 | { |
521d6a73 | 9647 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9648 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9649 | s64 inflight; |
9650 | DEFINE_WAIT(wait); | |
fdaf083c | 9651 | |
78cc687b PB |
9652 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9653 | ||
6d042ffb PO |
9654 | if (!current->io_uring) |
9655 | return; | |
17a91051 PB |
9656 | if (tctx->io_wq) |
9657 | io_wq_exit_start(tctx->io_wq); | |
9658 | ||
0e9ddb39 PB |
9659 | atomic_inc(&tctx->in_idle); |
9660 | do { | |
e9dbe221 | 9661 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9662 | /* read completions before cancelations */ |
78cc687b | 9663 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9664 | if (!inflight) |
9665 | break; | |
fdaf083c | 9666 | |
78cc687b PB |
9667 | if (!sqd) { |
9668 | struct io_tctx_node *node; | |
9669 | unsigned long index; | |
0f212204 | 9670 | |
78cc687b PB |
9671 | xa_for_each(&tctx->xa, index, node) { |
9672 | /* sqpoll task will cancel all its requests */ | |
9673 | if (node->ctx->sq_data) | |
9674 | continue; | |
9675 | io_uring_try_cancel_requests(node->ctx, current, | |
9676 | cancel_all); | |
9677 | } | |
9678 | } else { | |
9679 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9680 | io_uring_try_cancel_requests(ctx, current, | |
9681 | cancel_all); | |
9682 | } | |
17a91051 | 9683 | |
0f212204 | 9684 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9685 | io_uring_drop_tctx_refs(current); |
0f212204 | 9686 | /* |
a1bb3cd5 PB |
9687 | * If we've seen completions, retry without waiting. This |
9688 | * avoids a race where a completion comes in before we did | |
9689 | * prepare_to_wait(). | |
0f212204 | 9690 | */ |
3dd0c97a | 9691 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9692 | schedule(); |
f57555ed | 9693 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9694 | } while (1); |
fdaf083c | 9695 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9696 | |
8452d4a6 | 9697 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9698 | if (cancel_all) { |
3f48cf18 PB |
9699 | /* for exec all current's requests should be gone, kill tctx */ |
9700 | __io_uring_free(current); | |
9701 | } | |
44e728b8 PB |
9702 | } |
9703 | ||
f552a27a | 9704 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9705 | { |
f552a27a | 9706 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9707 | } |
9708 | ||
6c5c240e RP |
9709 | static void *io_uring_validate_mmap_request(struct file *file, |
9710 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9711 | { |
2b188cc1 | 9712 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9713 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9714 | struct page *page; |
9715 | void *ptr; | |
9716 | ||
9717 | switch (offset) { | |
9718 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9719 | case IORING_OFF_CQ_RING: |
9720 | ptr = ctx->rings; | |
2b188cc1 JA |
9721 | break; |
9722 | case IORING_OFF_SQES: | |
9723 | ptr = ctx->sq_sqes; | |
9724 | break; | |
2b188cc1 | 9725 | default: |
6c5c240e | 9726 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9727 | } |
9728 | ||
9729 | page = virt_to_head_page(ptr); | |
a50b854e | 9730 | if (sz > page_size(page)) |
6c5c240e RP |
9731 | return ERR_PTR(-EINVAL); |
9732 | ||
9733 | return ptr; | |
9734 | } | |
9735 | ||
9736 | #ifdef CONFIG_MMU | |
9737 | ||
9738 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9739 | { | |
9740 | size_t sz = vma->vm_end - vma->vm_start; | |
9741 | unsigned long pfn; | |
9742 | void *ptr; | |
9743 | ||
9744 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9745 | if (IS_ERR(ptr)) | |
9746 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9747 | |
9748 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9749 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9750 | } | |
9751 | ||
6c5c240e RP |
9752 | #else /* !CONFIG_MMU */ |
9753 | ||
9754 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9755 | { | |
9756 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9757 | } | |
9758 | ||
9759 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9760 | { | |
9761 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9762 | } | |
9763 | ||
9764 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9765 | unsigned long addr, unsigned long len, | |
9766 | unsigned long pgoff, unsigned long flags) | |
9767 | { | |
9768 | void *ptr; | |
9769 | ||
9770 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9771 | if (IS_ERR(ptr)) | |
9772 | return PTR_ERR(ptr); | |
9773 | ||
9774 | return (unsigned long) ptr; | |
9775 | } | |
9776 | ||
9777 | #endif /* !CONFIG_MMU */ | |
9778 | ||
d9d05217 | 9779 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9780 | { |
9781 | DEFINE_WAIT(wait); | |
9782 | ||
9783 | do { | |
9784 | if (!io_sqring_full(ctx)) | |
9785 | break; | |
90554200 JA |
9786 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9787 | ||
9788 | if (!io_sqring_full(ctx)) | |
9789 | break; | |
90554200 JA |
9790 | schedule(); |
9791 | } while (!signal_pending(current)); | |
9792 | ||
9793 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9794 | return 0; |
90554200 JA |
9795 | } |
9796 | ||
c73ebb68 HX |
9797 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9798 | struct __kernel_timespec __user **ts, | |
9799 | const sigset_t __user **sig) | |
9800 | { | |
9801 | struct io_uring_getevents_arg arg; | |
9802 | ||
9803 | /* | |
9804 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9805 | * is just a pointer to the sigset_t. | |
9806 | */ | |
9807 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9808 | *sig = (const sigset_t __user *) argp; | |
9809 | *ts = NULL; | |
9810 | return 0; | |
9811 | } | |
9812 | ||
9813 | /* | |
9814 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9815 | * timespec and sigset_t pointers if good. | |
9816 | */ | |
9817 | if (*argsz != sizeof(arg)) | |
9818 | return -EINVAL; | |
9819 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9820 | return -EFAULT; | |
9821 | *sig = u64_to_user_ptr(arg.sigmask); | |
9822 | *argsz = arg.sigmask_sz; | |
9823 | *ts = u64_to_user_ptr(arg.ts); | |
9824 | return 0; | |
9825 | } | |
9826 | ||
2b188cc1 | 9827 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9828 | u32, min_complete, u32, flags, const void __user *, argp, |
9829 | size_t, argsz) | |
2b188cc1 JA |
9830 | { |
9831 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9832 | int submitted = 0; |
9833 | struct fd f; | |
33f993da | 9834 | long ret; |
2b188cc1 | 9835 | |
4c6e277c | 9836 | io_run_task_work(); |
b41e9852 | 9837 | |
33f993da PB |
9838 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9839 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9840 | return -EINVAL; |
9841 | ||
9842 | f = fdget(fd); | |
33f993da | 9843 | if (unlikely(!f.file)) |
2b188cc1 JA |
9844 | return -EBADF; |
9845 | ||
9846 | ret = -EOPNOTSUPP; | |
33f993da | 9847 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9848 | goto out_fput; |
9849 | ||
9850 | ret = -ENXIO; | |
9851 | ctx = f.file->private_data; | |
33f993da | 9852 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9853 | goto out_fput; |
9854 | ||
7e84e1c7 | 9855 | ret = -EBADFD; |
33f993da | 9856 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9857 | goto out; |
9858 | ||
6c271ce2 JA |
9859 | /* |
9860 | * For SQ polling, the thread will do all submissions and completions. | |
9861 | * Just return the requested submit count, and wake the thread if | |
9862 | * we were asked to. | |
9863 | */ | |
b2a9eada | 9864 | ret = 0; |
6c271ce2 | 9865 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 9866 | io_cqring_overflow_flush(ctx); |
89448c47 | 9867 | |
21f96522 JA |
9868 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9869 | ret = -EOWNERDEAD; | |
04147488 | 9870 | goto out; |
21f96522 | 9871 | } |
6c271ce2 | 9872 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9873 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9874 | if (flags & IORING_ENTER_SQ_WAIT) { |
9875 | ret = io_sqpoll_wait_sq(ctx); | |
9876 | if (ret) | |
9877 | goto out; | |
9878 | } | |
6c271ce2 | 9879 | submitted = to_submit; |
b2a9eada | 9880 | } else if (to_submit) { |
eef51daa | 9881 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9882 | if (unlikely(ret)) |
9883 | goto out; | |
2b188cc1 | 9884 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9885 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9886 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9887 | |
9888 | if (submitted != to_submit) | |
9889 | goto out; | |
2b188cc1 JA |
9890 | } |
9891 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9892 | const sigset_t __user *sig; |
9893 | struct __kernel_timespec __user *ts; | |
9894 | ||
9895 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9896 | if (unlikely(ret)) | |
9897 | goto out; | |
9898 | ||
2b188cc1 JA |
9899 | min_complete = min(min_complete, ctx->cq_entries); |
9900 | ||
32b2244a XW |
9901 | /* |
9902 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9903 | * space applications don't need to do io completion events | |
9904 | * polling again, they can rely on io_sq_thread to do polling | |
9905 | * work, which can reduce cpu usage and uring_lock contention. | |
9906 | */ | |
9907 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9908 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9909 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9910 | } else { |
c73ebb68 | 9911 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9912 | } |
2b188cc1 JA |
9913 | } |
9914 | ||
7c504e65 | 9915 | out: |
6805b32e | 9916 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9917 | out_fput: |
9918 | fdput(f); | |
9919 | return submitted ? submitted : ret; | |
9920 | } | |
9921 | ||
bebdb65e | 9922 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9923 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9924 | const struct cred *cred) | |
87ce955b | 9925 | { |
87ce955b JA |
9926 | struct user_namespace *uns = seq_user_ns(m); |
9927 | struct group_info *gi; | |
9928 | kernel_cap_t cap; | |
9929 | unsigned __capi; | |
9930 | int g; | |
9931 | ||
9932 | seq_printf(m, "%5d\n", id); | |
9933 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9934 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9935 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9936 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9937 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9938 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9939 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9940 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9941 | seq_puts(m, "\n\tGroups:\t"); | |
9942 | gi = cred->group_info; | |
9943 | for (g = 0; g < gi->ngroups; g++) { | |
9944 | seq_put_decimal_ull(m, g ? " " : "", | |
9945 | from_kgid_munged(uns, gi->gid[g])); | |
9946 | } | |
9947 | seq_puts(m, "\n\tCapEff:\t"); | |
9948 | cap = cred->cap_effective; | |
9949 | CAP_FOR_EACH_U32(__capi) | |
9950 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9951 | seq_putc(m, '\n'); | |
9952 | return 0; | |
9953 | } | |
9954 | ||
9955 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9956 | { | |
dbbe9c64 | 9957 | struct io_sq_data *sq = NULL; |
fad8e0de | 9958 | bool has_lock; |
87ce955b JA |
9959 | int i; |
9960 | ||
fad8e0de JA |
9961 | /* |
9962 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9963 | * since fdinfo case grabs it in the opposite direction of normal use | |
9964 | * cases. If we fail to get the lock, we just don't iterate any | |
9965 | * structures that could be going away outside the io_uring mutex. | |
9966 | */ | |
9967 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9968 | ||
5f3f26f9 | 9969 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9970 | sq = ctx->sq_data; |
5f3f26f9 JA |
9971 | if (!sq->thread) |
9972 | sq = NULL; | |
9973 | } | |
dbbe9c64 JQ |
9974 | |
9975 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9976 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9977 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9978 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9979 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9980 | |
87ce955b JA |
9981 | if (f) |
9982 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9983 | else | |
9984 | seq_printf(m, "%5u: <none>\n", i); | |
9985 | } | |
9986 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9987 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 9988 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 9989 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 9990 | |
4751f53d | 9991 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 9992 | } |
61cf9370 MWO |
9993 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9994 | unsigned long index; | |
9995 | const struct cred *cred; | |
9996 | ||
87ce955b | 9997 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9998 | xa_for_each(&ctx->personalities, index, cred) |
9999 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10000 | } |
d7718a9d | 10001 | seq_printf(m, "PollList:\n"); |
79ebeaee | 10002 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10003 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10004 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10005 | struct io_kiocb *req; | |
10006 | ||
10007 | hlist_for_each_entry(req, list, hash_node) | |
10008 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10009 | req->task->task_works != NULL); | |
10010 | } | |
79ebeaee | 10011 | spin_unlock(&ctx->completion_lock); |
fad8e0de JA |
10012 | if (has_lock) |
10013 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
10014 | } |
10015 | ||
10016 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
10017 | { | |
10018 | struct io_ring_ctx *ctx = f->private_data; | |
10019 | ||
10020 | if (percpu_ref_tryget(&ctx->refs)) { | |
10021 | __io_uring_show_fdinfo(ctx, m); | |
10022 | percpu_ref_put(&ctx->refs); | |
10023 | } | |
10024 | } | |
bebdb65e | 10025 | #endif |
87ce955b | 10026 | |
2b188cc1 JA |
10027 | static const struct file_operations io_uring_fops = { |
10028 | .release = io_uring_release, | |
10029 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10030 | #ifndef CONFIG_MMU |
10031 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10032 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10033 | #endif | |
2b188cc1 JA |
10034 | .poll = io_uring_poll, |
10035 | .fasync = io_uring_fasync, | |
bebdb65e | 10036 | #ifdef CONFIG_PROC_FS |
87ce955b | 10037 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10038 | #endif |
2b188cc1 JA |
10039 | }; |
10040 | ||
10041 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
10042 | struct io_uring_params *p) | |
10043 | { | |
75b28aff HV |
10044 | struct io_rings *rings; |
10045 | size_t size, sq_array_offset; | |
2b188cc1 | 10046 | |
bd740481 JA |
10047 | /* make sure these are sane, as we already accounted them */ |
10048 | ctx->sq_entries = p->sq_entries; | |
10049 | ctx->cq_entries = p->cq_entries; | |
10050 | ||
75b28aff HV |
10051 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10052 | if (size == SIZE_MAX) | |
10053 | return -EOVERFLOW; | |
10054 | ||
10055 | rings = io_mem_alloc(size); | |
10056 | if (!rings) | |
2b188cc1 JA |
10057 | return -ENOMEM; |
10058 | ||
75b28aff HV |
10059 | ctx->rings = rings; |
10060 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10061 | rings->sq_ring_mask = p->sq_entries - 1; | |
10062 | rings->cq_ring_mask = p->cq_entries - 1; | |
10063 | rings->sq_ring_entries = p->sq_entries; | |
10064 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10065 | |
10066 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10067 | if (size == SIZE_MAX) { |
10068 | io_mem_free(ctx->rings); | |
10069 | ctx->rings = NULL; | |
2b188cc1 | 10070 | return -EOVERFLOW; |
eb065d30 | 10071 | } |
2b188cc1 JA |
10072 | |
10073 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10074 | if (!ctx->sq_sqes) { |
10075 | io_mem_free(ctx->rings); | |
10076 | ctx->rings = NULL; | |
2b188cc1 | 10077 | return -ENOMEM; |
eb065d30 | 10078 | } |
2b188cc1 | 10079 | |
2b188cc1 JA |
10080 | return 0; |
10081 | } | |
10082 | ||
9faadcc8 PB |
10083 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10084 | { | |
10085 | int ret, fd; | |
10086 | ||
10087 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10088 | if (fd < 0) | |
10089 | return fd; | |
10090 | ||
eef51daa | 10091 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10092 | if (ret) { |
10093 | put_unused_fd(fd); | |
10094 | return ret; | |
10095 | } | |
10096 | fd_install(fd, file); | |
10097 | return fd; | |
10098 | } | |
10099 | ||
2b188cc1 JA |
10100 | /* |
10101 | * Allocate an anonymous fd, this is what constitutes the application | |
10102 | * visible backing of an io_uring instance. The application mmaps this | |
10103 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10104 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10105 | */ | |
9faadcc8 | 10106 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10107 | { |
10108 | struct file *file; | |
9faadcc8 | 10109 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10110 | int ret; |
10111 | ||
2b188cc1 JA |
10112 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10113 | &ctx->ring_sock); | |
10114 | if (ret) | |
9faadcc8 | 10115 | return ERR_PTR(ret); |
2b188cc1 JA |
10116 | #endif |
10117 | ||
2b188cc1 JA |
10118 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
10119 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 10120 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10121 | if (IS_ERR(file)) { |
10122 | sock_release(ctx->ring_sock); | |
10123 | ctx->ring_sock = NULL; | |
10124 | } else { | |
10125 | ctx->ring_sock->file = file; | |
0f212204 | 10126 | } |
2b188cc1 | 10127 | #endif |
9faadcc8 | 10128 | return file; |
2b188cc1 JA |
10129 | } |
10130 | ||
7f13657d XW |
10131 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
10132 | struct io_uring_params __user *params) | |
2b188cc1 | 10133 | { |
2b188cc1 | 10134 | struct io_ring_ctx *ctx; |
9faadcc8 | 10135 | struct file *file; |
2b188cc1 JA |
10136 | int ret; |
10137 | ||
8110c1a6 | 10138 | if (!entries) |
2b188cc1 | 10139 | return -EINVAL; |
8110c1a6 JA |
10140 | if (entries > IORING_MAX_ENTRIES) { |
10141 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10142 | return -EINVAL; | |
10143 | entries = IORING_MAX_ENTRIES; | |
10144 | } | |
2b188cc1 JA |
10145 | |
10146 | /* | |
10147 | * Use twice as many entries for the CQ ring. It's possible for the | |
10148 | * application to drive a higher depth than the size of the SQ ring, | |
10149 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10150 | * some flexibility in overcommitting a bit. If the application has |
10151 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10152 | * of CQ ring entries manually. | |
2b188cc1 JA |
10153 | */ |
10154 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10155 | if (p->flags & IORING_SETUP_CQSIZE) { |
10156 | /* | |
10157 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10158 | * to a power-of-two, if it isn't already. We do NOT impose | |
10159 | * any cq vs sq ring sizing. | |
10160 | */ | |
eb2667b3 | 10161 | if (!p->cq_entries) |
33a107f0 | 10162 | return -EINVAL; |
8110c1a6 JA |
10163 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10164 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10165 | return -EINVAL; | |
10166 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10167 | } | |
eb2667b3 JQ |
10168 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10169 | if (p->cq_entries < p->sq_entries) | |
10170 | return -EINVAL; | |
33a107f0 JA |
10171 | } else { |
10172 | p->cq_entries = 2 * p->sq_entries; | |
10173 | } | |
2b188cc1 | 10174 | |
2b188cc1 | 10175 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10176 | if (!ctx) |
2b188cc1 | 10177 | return -ENOMEM; |
2b188cc1 | 10178 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10179 | if (!capable(CAP_IPC_LOCK)) |
10180 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10181 | |
10182 | /* | |
10183 | * This is just grabbed for accounting purposes. When a process exits, | |
10184 | * the mm is exited and dropped before the files, hence we need to hang | |
10185 | * on to this mm purely for the purposes of being able to unaccount | |
10186 | * memory (locked/pinned vm). It's not used for anything else. | |
10187 | */ | |
6b7898eb | 10188 | mmgrab(current->mm); |
2aede0e4 | 10189 | ctx->mm_account = current->mm; |
6b7898eb | 10190 | |
2b188cc1 JA |
10191 | ret = io_allocate_scq_urings(ctx, p); |
10192 | if (ret) | |
10193 | goto err; | |
10194 | ||
7e84e1c7 | 10195 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10196 | if (ret) |
10197 | goto err; | |
eae071c9 | 10198 | /* always set a rsrc node */ |
47b228ce PB |
10199 | ret = io_rsrc_node_switch_start(ctx); |
10200 | if (ret) | |
10201 | goto err; | |
eae071c9 | 10202 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10203 | |
2b188cc1 | 10204 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10205 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10206 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10207 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10208 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10209 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10210 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10211 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10212 | |
10213 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10214 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10215 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10216 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10217 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10218 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10219 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10220 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10221 | |
7f13657d XW |
10222 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10223 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10224 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10225 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10226 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10227 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10228 | |
10229 | if (copy_to_user(params, p, sizeof(*p))) { | |
10230 | ret = -EFAULT; | |
10231 | goto err; | |
10232 | } | |
d1719f70 | 10233 | |
9faadcc8 PB |
10234 | file = io_uring_get_file(ctx); |
10235 | if (IS_ERR(file)) { | |
10236 | ret = PTR_ERR(file); | |
10237 | goto err; | |
10238 | } | |
10239 | ||
044c1ab3 JA |
10240 | /* |
10241 | * Install ring fd as the very last thing, so we don't risk someone | |
10242 | * having closed it before we finish setup | |
10243 | */ | |
9faadcc8 PB |
10244 | ret = io_uring_install_fd(ctx, file); |
10245 | if (ret < 0) { | |
10246 | /* fput will clean it up */ | |
10247 | fput(file); | |
10248 | return ret; | |
10249 | } | |
044c1ab3 | 10250 | |
c826bd7a | 10251 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10252 | return ret; |
10253 | err: | |
10254 | io_ring_ctx_wait_and_kill(ctx); | |
10255 | return ret; | |
10256 | } | |
10257 | ||
10258 | /* | |
10259 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10260 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10261 | * params structure passed in. | |
10262 | */ | |
10263 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10264 | { | |
10265 | struct io_uring_params p; | |
2b188cc1 JA |
10266 | int i; |
10267 | ||
10268 | if (copy_from_user(&p, params, sizeof(p))) | |
10269 | return -EFAULT; | |
10270 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10271 | if (p.resv[i]) | |
10272 | return -EINVAL; | |
10273 | } | |
10274 | ||
6c271ce2 | 10275 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10276 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10277 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10278 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10279 | return -EINVAL; |
10280 | ||
7f13657d | 10281 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10282 | } |
10283 | ||
10284 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10285 | struct io_uring_params __user *, params) | |
10286 | { | |
10287 | return io_uring_setup(entries, params); | |
10288 | } | |
10289 | ||
66f4af93 JA |
10290 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
10291 | { | |
10292 | struct io_uring_probe *p; | |
10293 | size_t size; | |
10294 | int i, ret; | |
10295 | ||
10296 | size = struct_size(p, ops, nr_args); | |
10297 | if (size == SIZE_MAX) | |
10298 | return -EOVERFLOW; | |
10299 | p = kzalloc(size, GFP_KERNEL); | |
10300 | if (!p) | |
10301 | return -ENOMEM; | |
10302 | ||
10303 | ret = -EFAULT; | |
10304 | if (copy_from_user(p, arg, size)) | |
10305 | goto out; | |
10306 | ret = -EINVAL; | |
10307 | if (memchr_inv(p, 0, size)) | |
10308 | goto out; | |
10309 | ||
10310 | p->last_op = IORING_OP_LAST - 1; | |
10311 | if (nr_args > IORING_OP_LAST) | |
10312 | nr_args = IORING_OP_LAST; | |
10313 | ||
10314 | for (i = 0; i < nr_args; i++) { | |
10315 | p->ops[i].op = i; | |
10316 | if (!io_op_defs[i].not_supported) | |
10317 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10318 | } | |
10319 | p->ops_len = i; | |
10320 | ||
10321 | ret = 0; | |
10322 | if (copy_to_user(arg, p, size)) | |
10323 | ret = -EFAULT; | |
10324 | out: | |
10325 | kfree(p); | |
10326 | return ret; | |
10327 | } | |
10328 | ||
071698e1 JA |
10329 | static int io_register_personality(struct io_ring_ctx *ctx) |
10330 | { | |
4379bf8b | 10331 | const struct cred *creds; |
61cf9370 | 10332 | u32 id; |
1e6fa521 | 10333 | int ret; |
071698e1 | 10334 | |
4379bf8b | 10335 | creds = get_current_cred(); |
1e6fa521 | 10336 | |
61cf9370 MWO |
10337 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10338 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10339 | if (ret < 0) { |
10340 | put_cred(creds); | |
10341 | return ret; | |
10342 | } | |
10343 | return id; | |
071698e1 JA |
10344 | } |
10345 | ||
21b55dbc SG |
10346 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
10347 | unsigned int nr_args) | |
10348 | { | |
10349 | struct io_uring_restriction *res; | |
10350 | size_t size; | |
10351 | int i, ret; | |
10352 | ||
7e84e1c7 SG |
10353 | /* Restrictions allowed only if rings started disabled */ |
10354 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10355 | return -EBADFD; | |
10356 | ||
21b55dbc | 10357 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10358 | if (ctx->restrictions.registered) |
21b55dbc SG |
10359 | return -EBUSY; |
10360 | ||
10361 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10362 | return -EINVAL; | |
10363 | ||
10364 | size = array_size(nr_args, sizeof(*res)); | |
10365 | if (size == SIZE_MAX) | |
10366 | return -EOVERFLOW; | |
10367 | ||
10368 | res = memdup_user(arg, size); | |
10369 | if (IS_ERR(res)) | |
10370 | return PTR_ERR(res); | |
10371 | ||
10372 | ret = 0; | |
10373 | ||
10374 | for (i = 0; i < nr_args; i++) { | |
10375 | switch (res[i].opcode) { | |
10376 | case IORING_RESTRICTION_REGISTER_OP: | |
10377 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10378 | ret = -EINVAL; | |
10379 | goto out; | |
10380 | } | |
10381 | ||
10382 | __set_bit(res[i].register_op, | |
10383 | ctx->restrictions.register_op); | |
10384 | break; | |
10385 | case IORING_RESTRICTION_SQE_OP: | |
10386 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10387 | ret = -EINVAL; | |
10388 | goto out; | |
10389 | } | |
10390 | ||
10391 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10392 | break; | |
10393 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10394 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10395 | break; | |
10396 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10397 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10398 | break; | |
10399 | default: | |
10400 | ret = -EINVAL; | |
10401 | goto out; | |
10402 | } | |
10403 | } | |
10404 | ||
10405 | out: | |
10406 | /* Reset all restrictions if an error happened */ | |
10407 | if (ret != 0) | |
10408 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10409 | else | |
7e84e1c7 | 10410 | ctx->restrictions.registered = true; |
21b55dbc SG |
10411 | |
10412 | kfree(res); | |
10413 | return ret; | |
10414 | } | |
10415 | ||
7e84e1c7 SG |
10416 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10417 | { | |
10418 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10419 | return -EBADFD; | |
10420 | ||
10421 | if (ctx->restrictions.registered) | |
10422 | ctx->restricted = 1; | |
10423 | ||
0298ef96 PB |
10424 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10425 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10426 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10427 | return 0; |
10428 | } | |
10429 | ||
fdecb662 | 10430 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10431 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10432 | unsigned nr_args) |
10433 | { | |
10434 | __u32 tmp; | |
10435 | int err; | |
10436 | ||
c3bdad02 PB |
10437 | if (up->resv) |
10438 | return -EINVAL; | |
98f0b3b4 PB |
10439 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10440 | return -EOVERFLOW; | |
10441 | err = io_rsrc_node_switch_start(ctx); | |
10442 | if (err) | |
10443 | return err; | |
10444 | ||
fdecb662 PB |
10445 | switch (type) { |
10446 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10447 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10448 | case IORING_RSRC_BUFFER: |
10449 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10450 | } |
10451 | return -EINVAL; | |
10452 | } | |
10453 | ||
c3bdad02 PB |
10454 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10455 | unsigned nr_args) | |
98f0b3b4 | 10456 | { |
c3bdad02 | 10457 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10458 | |
10459 | if (!nr_args) | |
10460 | return -EINVAL; | |
c3bdad02 PB |
10461 | memset(&up, 0, sizeof(up)); |
10462 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10463 | return -EFAULT; | |
10464 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10465 | } | |
10466 | ||
10467 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10468 | unsigned size, unsigned type) |
c3bdad02 PB |
10469 | { |
10470 | struct io_uring_rsrc_update2 up; | |
10471 | ||
10472 | if (size != sizeof(up)) | |
10473 | return -EINVAL; | |
98f0b3b4 PB |
10474 | if (copy_from_user(&up, arg, sizeof(up))) |
10475 | return -EFAULT; | |
992da01a | 10476 | if (!up.nr || up.resv) |
98f0b3b4 | 10477 | return -EINVAL; |
992da01a | 10478 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10479 | } |
10480 | ||
792e3582 | 10481 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10482 | unsigned int size, unsigned int type) |
792e3582 PB |
10483 | { |
10484 | struct io_uring_rsrc_register rr; | |
10485 | ||
10486 | /* keep it extendible */ | |
10487 | if (size != sizeof(rr)) | |
10488 | return -EINVAL; | |
10489 | ||
10490 | memset(&rr, 0, sizeof(rr)); | |
10491 | if (copy_from_user(&rr, arg, size)) | |
10492 | return -EFAULT; | |
992da01a | 10493 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10494 | return -EINVAL; |
10495 | ||
992da01a | 10496 | switch (type) { |
792e3582 PB |
10497 | case IORING_RSRC_FILE: |
10498 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10499 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10500 | case IORING_RSRC_BUFFER: |
10501 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10502 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10503 | } |
10504 | return -EINVAL; | |
10505 | } | |
10506 | ||
fe76421d JA |
10507 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10508 | unsigned len) | |
10509 | { | |
10510 | struct io_uring_task *tctx = current->io_uring; | |
10511 | cpumask_var_t new_mask; | |
10512 | int ret; | |
10513 | ||
10514 | if (!tctx || !tctx->io_wq) | |
10515 | return -EINVAL; | |
10516 | ||
10517 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10518 | return -ENOMEM; | |
10519 | ||
10520 | cpumask_clear(new_mask); | |
10521 | if (len > cpumask_size()) | |
10522 | len = cpumask_size(); | |
10523 | ||
10524 | if (copy_from_user(new_mask, arg, len)) { | |
10525 | free_cpumask_var(new_mask); | |
10526 | return -EFAULT; | |
10527 | } | |
10528 | ||
10529 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10530 | free_cpumask_var(new_mask); | |
10531 | return ret; | |
10532 | } | |
10533 | ||
10534 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10535 | { | |
10536 | struct io_uring_task *tctx = current->io_uring; | |
10537 | ||
10538 | if (!tctx || !tctx->io_wq) | |
10539 | return -EINVAL; | |
10540 | ||
10541 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10542 | } | |
10543 | ||
2e480058 JA |
10544 | static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10545 | void __user *arg) | |
10546 | { | |
fa84693b JA |
10547 | struct io_uring_task *tctx = NULL; |
10548 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10549 | __u32 new_count[2]; |
10550 | int i, ret; | |
10551 | ||
2e480058 JA |
10552 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10553 | return -EFAULT; | |
10554 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10555 | if (new_count[i] > INT_MAX) | |
10556 | return -EINVAL; | |
10557 | ||
fa84693b JA |
10558 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10559 | sqd = ctx->sq_data; | |
10560 | if (sqd) { | |
009ad9f0 JA |
10561 | /* |
10562 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10563 | * ordering. Fine to drop uring_lock here, we hold | |
10564 | * a ref to the ctx. | |
10565 | */ | |
10566 | mutex_unlock(&ctx->uring_lock); | |
fa84693b | 10567 | mutex_lock(&sqd->lock); |
009ad9f0 | 10568 | mutex_lock(&ctx->uring_lock); |
fa84693b JA |
10569 | tctx = sqd->thread->io_uring; |
10570 | } | |
10571 | } else { | |
10572 | tctx = current->io_uring; | |
10573 | } | |
10574 | ||
10575 | ret = -EINVAL; | |
10576 | if (!tctx || !tctx->io_wq) | |
10577 | goto err; | |
10578 | ||
2e480058 JA |
10579 | ret = io_wq_max_workers(tctx->io_wq, new_count); |
10580 | if (ret) | |
fa84693b JA |
10581 | goto err; |
10582 | ||
10583 | if (sqd) | |
10584 | mutex_unlock(&sqd->lock); | |
2e480058 JA |
10585 | |
10586 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10587 | return -EFAULT; | |
10588 | ||
10589 | return 0; | |
fa84693b JA |
10590 | err: |
10591 | if (sqd) | |
10592 | mutex_unlock(&sqd->lock); | |
10593 | return ret; | |
2e480058 JA |
10594 | } |
10595 | ||
071698e1 JA |
10596 | static bool io_register_op_must_quiesce(int op) |
10597 | { | |
10598 | switch (op) { | |
bd54b6fe BM |
10599 | case IORING_REGISTER_BUFFERS: |
10600 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10601 | case IORING_REGISTER_FILES: |
071698e1 JA |
10602 | case IORING_UNREGISTER_FILES: |
10603 | case IORING_REGISTER_FILES_UPDATE: | |
10604 | case IORING_REGISTER_PROBE: | |
10605 | case IORING_REGISTER_PERSONALITY: | |
10606 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10607 | case IORING_REGISTER_FILES2: |
10608 | case IORING_REGISTER_FILES_UPDATE2: | |
10609 | case IORING_REGISTER_BUFFERS2: | |
10610 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10611 | case IORING_REGISTER_IOWQ_AFF: |
10612 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10613 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10614 | return false; |
10615 | default: | |
10616 | return true; | |
10617 | } | |
10618 | } | |
10619 | ||
e73c5c7c PB |
10620 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
10621 | { | |
10622 | long ret; | |
10623 | ||
10624 | percpu_ref_kill(&ctx->refs); | |
10625 | ||
10626 | /* | |
10627 | * Drop uring mutex before waiting for references to exit. If another | |
10628 | * thread is currently inside io_uring_enter() it might need to grab the | |
10629 | * uring_lock to make progress. If we hold it here across the drain | |
10630 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10631 | * no new references will come in after we've killed the percpu ref. | |
10632 | */ | |
10633 | mutex_unlock(&ctx->uring_lock); | |
10634 | do { | |
10635 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10636 | if (!ret) | |
10637 | break; | |
10638 | ret = io_run_task_work_sig(); | |
10639 | } while (ret >= 0); | |
10640 | mutex_lock(&ctx->uring_lock); | |
10641 | ||
10642 | if (ret) | |
10643 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10644 | return ret; | |
10645 | } | |
10646 | ||
edafccee JA |
10647 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10648 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10649 | __releases(ctx->uring_lock) |
10650 | __acquires(ctx->uring_lock) | |
edafccee JA |
10651 | { |
10652 | int ret; | |
10653 | ||
35fa71a0 JA |
10654 | /* |
10655 | * We're inside the ring mutex, if the ref is already dying, then | |
10656 | * someone else killed the ctx or is already going through | |
10657 | * io_uring_register(). | |
10658 | */ | |
10659 | if (percpu_ref_is_dying(&ctx->refs)) | |
10660 | return -ENXIO; | |
10661 | ||
75c4021a PB |
10662 | if (ctx->restricted) { |
10663 | if (opcode >= IORING_REGISTER_LAST) | |
10664 | return -EINVAL; | |
10665 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10666 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10667 | return -EACCES; | |
10668 | } | |
10669 | ||
071698e1 | 10670 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10671 | ret = io_ctx_quiesce(ctx); |
10672 | if (ret) | |
f70865db | 10673 | return ret; |
05f3fb3c | 10674 | } |
edafccee JA |
10675 | |
10676 | switch (opcode) { | |
10677 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10678 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10679 | break; |
10680 | case IORING_UNREGISTER_BUFFERS: | |
10681 | ret = -EINVAL; | |
10682 | if (arg || nr_args) | |
10683 | break; | |
0a96bbe4 | 10684 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10685 | break; |
6b06314c | 10686 | case IORING_REGISTER_FILES: |
792e3582 | 10687 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10688 | break; |
10689 | case IORING_UNREGISTER_FILES: | |
10690 | ret = -EINVAL; | |
10691 | if (arg || nr_args) | |
10692 | break; | |
10693 | ret = io_sqe_files_unregister(ctx); | |
10694 | break; | |
c3a31e60 | 10695 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10696 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10697 | break; |
9b402849 | 10698 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10699 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10700 | ret = -EINVAL; |
10701 | if (nr_args != 1) | |
10702 | break; | |
10703 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10704 | if (ret) |
10705 | break; | |
10706 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10707 | ctx->eventfd_async = 1; | |
10708 | else | |
10709 | ctx->eventfd_async = 0; | |
9b402849 JA |
10710 | break; |
10711 | case IORING_UNREGISTER_EVENTFD: | |
10712 | ret = -EINVAL; | |
10713 | if (arg || nr_args) | |
10714 | break; | |
10715 | ret = io_eventfd_unregister(ctx); | |
10716 | break; | |
66f4af93 JA |
10717 | case IORING_REGISTER_PROBE: |
10718 | ret = -EINVAL; | |
10719 | if (!arg || nr_args > 256) | |
10720 | break; | |
10721 | ret = io_probe(ctx, arg, nr_args); | |
10722 | break; | |
071698e1 JA |
10723 | case IORING_REGISTER_PERSONALITY: |
10724 | ret = -EINVAL; | |
10725 | if (arg || nr_args) | |
10726 | break; | |
10727 | ret = io_register_personality(ctx); | |
10728 | break; | |
10729 | case IORING_UNREGISTER_PERSONALITY: | |
10730 | ret = -EINVAL; | |
10731 | if (arg) | |
10732 | break; | |
10733 | ret = io_unregister_personality(ctx, nr_args); | |
10734 | break; | |
7e84e1c7 SG |
10735 | case IORING_REGISTER_ENABLE_RINGS: |
10736 | ret = -EINVAL; | |
10737 | if (arg || nr_args) | |
10738 | break; | |
10739 | ret = io_register_enable_rings(ctx); | |
10740 | break; | |
21b55dbc SG |
10741 | case IORING_REGISTER_RESTRICTIONS: |
10742 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10743 | break; | |
992da01a PB |
10744 | case IORING_REGISTER_FILES2: |
10745 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10746 | break; | |
10747 | case IORING_REGISTER_FILES_UPDATE2: | |
10748 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10749 | IORING_RSRC_FILE); | |
10750 | break; | |
10751 | case IORING_REGISTER_BUFFERS2: | |
10752 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10753 | break; |
992da01a PB |
10754 | case IORING_REGISTER_BUFFERS_UPDATE: |
10755 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10756 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10757 | break; |
fe76421d JA |
10758 | case IORING_REGISTER_IOWQ_AFF: |
10759 | ret = -EINVAL; | |
10760 | if (!arg || !nr_args) | |
10761 | break; | |
10762 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10763 | break; | |
10764 | case IORING_UNREGISTER_IOWQ_AFF: | |
10765 | ret = -EINVAL; | |
10766 | if (arg || nr_args) | |
10767 | break; | |
10768 | ret = io_unregister_iowq_aff(ctx); | |
10769 | break; | |
2e480058 JA |
10770 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
10771 | ret = -EINVAL; | |
10772 | if (!arg || nr_args != 2) | |
10773 | break; | |
10774 | ret = io_register_iowq_max_workers(ctx, arg); | |
10775 | break; | |
edafccee JA |
10776 | default: |
10777 | ret = -EINVAL; | |
10778 | break; | |
10779 | } | |
10780 | ||
071698e1 | 10781 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10782 | /* bring the ctx back to life */ |
05f3fb3c | 10783 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10784 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10785 | } |
edafccee JA |
10786 | return ret; |
10787 | } | |
10788 | ||
10789 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10790 | void __user *, arg, unsigned int, nr_args) | |
10791 | { | |
10792 | struct io_ring_ctx *ctx; | |
10793 | long ret = -EBADF; | |
10794 | struct fd f; | |
10795 | ||
10796 | f = fdget(fd); | |
10797 | if (!f.file) | |
10798 | return -EBADF; | |
10799 | ||
10800 | ret = -EOPNOTSUPP; | |
10801 | if (f.file->f_op != &io_uring_fops) | |
10802 | goto out_fput; | |
10803 | ||
10804 | ctx = f.file->private_data; | |
10805 | ||
b6c23dd5 PB |
10806 | io_run_task_work(); |
10807 | ||
edafccee JA |
10808 | mutex_lock(&ctx->uring_lock); |
10809 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10810 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10811 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10812 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10813 | out_fput: |
10814 | fdput(f); | |
10815 | return ret; | |
10816 | } | |
10817 | ||
2b188cc1 JA |
10818 | static int __init io_uring_init(void) |
10819 | { | |
d7f62e82 SM |
10820 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10821 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10822 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10823 | } while (0) | |
10824 | ||
10825 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10826 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10827 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10828 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10829 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10830 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10831 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10832 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10833 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10834 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10835 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10836 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10837 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10838 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10839 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10840 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10841 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10842 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10843 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10844 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10845 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10846 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10847 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10848 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10849 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10850 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10851 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10852 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10853 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10854 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10855 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10856 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 10857 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 10858 | |
b0d658ec PB |
10859 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10860 | sizeof(struct io_uring_rsrc_update)); | |
10861 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10862 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
10863 | |
10864 | /* ->buf_index is u16 */ | |
10865 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
10866 | ||
b0d658ec PB |
10867 | /* should fit into one byte */ |
10868 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10869 | ||
d3656344 | 10870 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 10871 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 10872 | |
91f245d5 JA |
10873 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10874 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10875 | return 0; |
10876 | }; | |
10877 | __initcall(io_uring_init); |