Commit | Line | Data |
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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
14 | * through a control-dependency in io_get_cqring (smp_store_release to | |
15 | * store head will do). Failure to do so could lead to reading invalid | |
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> |
2b188cc1 | 81 | |
c826bd7a DD |
82 | #define CREATE_TRACE_POINTS |
83 | #include <trace/events/io_uring.h> | |
84 | ||
2b188cc1 JA |
85 | #include <uapi/linux/io_uring.h> |
86 | ||
87 | #include "internal.h" | |
561fb04a | 88 | #include "io-wq.h" |
2b188cc1 | 89 | |
5277deaa | 90 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 91 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
92 | |
93 | /* | |
94 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
95 | */ | |
96 | #define IORING_FILE_TABLE_SHIFT 9 | |
97 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
98 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
99 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
21b55dbc SG |
100 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
101 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 102 | |
b16fed66 PB |
103 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
104 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
105 | IOSQE_BUFFER_SELECT) | |
106 | ||
2b188cc1 JA |
107 | struct io_uring { |
108 | u32 head ____cacheline_aligned_in_smp; | |
109 | u32 tail ____cacheline_aligned_in_smp; | |
110 | }; | |
111 | ||
1e84b97b | 112 | /* |
75b28aff HV |
113 | * This data is shared with the application through the mmap at offsets |
114 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
115 | * |
116 | * The offsets to the member fields are published through struct | |
117 | * io_sqring_offsets when calling io_uring_setup. | |
118 | */ | |
75b28aff | 119 | struct io_rings { |
1e84b97b SB |
120 | /* |
121 | * Head and tail offsets into the ring; the offsets need to be | |
122 | * masked to get valid indices. | |
123 | * | |
75b28aff HV |
124 | * The kernel controls head of the sq ring and the tail of the cq ring, |
125 | * and the application controls tail of the sq ring and the head of the | |
126 | * cq ring. | |
1e84b97b | 127 | */ |
75b28aff | 128 | struct io_uring sq, cq; |
1e84b97b | 129 | /* |
75b28aff | 130 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
131 | * ring_entries - 1) |
132 | */ | |
75b28aff HV |
133 | u32 sq_ring_mask, cq_ring_mask; |
134 | /* Ring sizes (constant, power of 2) */ | |
135 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
136 | /* |
137 | * Number of invalid entries dropped by the kernel due to | |
138 | * invalid index stored in array | |
139 | * | |
140 | * Written by the kernel, shouldn't be modified by the | |
141 | * application (i.e. get number of "new events" by comparing to | |
142 | * cached value). | |
143 | * | |
144 | * After a new SQ head value was read by the application this | |
145 | * counter includes all submissions that were dropped reaching | |
146 | * the new SQ head (and possibly more). | |
147 | */ | |
75b28aff | 148 | u32 sq_dropped; |
1e84b97b | 149 | /* |
0d9b5b3a | 150 | * Runtime SQ flags |
1e84b97b SB |
151 | * |
152 | * Written by the kernel, shouldn't be modified by the | |
153 | * application. | |
154 | * | |
155 | * The application needs a full memory barrier before checking | |
156 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
157 | */ | |
75b28aff | 158 | u32 sq_flags; |
0d9b5b3a SG |
159 | /* |
160 | * Runtime CQ flags | |
161 | * | |
162 | * Written by the application, shouldn't be modified by the | |
163 | * kernel. | |
164 | */ | |
165 | u32 cq_flags; | |
1e84b97b SB |
166 | /* |
167 | * Number of completion events lost because the queue was full; | |
168 | * this should be avoided by the application by making sure | |
0b4295b5 | 169 | * there are not more requests pending than there is space in |
1e84b97b SB |
170 | * the completion queue. |
171 | * | |
172 | * Written by the kernel, shouldn't be modified by the | |
173 | * application (i.e. get number of "new events" by comparing to | |
174 | * cached value). | |
175 | * | |
176 | * As completion events come in out of order this counter is not | |
177 | * ordered with any other data. | |
178 | */ | |
75b28aff | 179 | u32 cq_overflow; |
1e84b97b SB |
180 | /* |
181 | * Ring buffer of completion events. | |
182 | * | |
183 | * The kernel writes completion events fresh every time they are | |
184 | * produced, so the application is allowed to modify pending | |
185 | * entries. | |
186 | */ | |
75b28aff | 187 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
188 | }; |
189 | ||
45d189c6 PB |
190 | enum io_uring_cmd_flags { |
191 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 192 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
193 | }; |
194 | ||
edafccee JA |
195 | struct io_mapped_ubuf { |
196 | u64 ubuf; | |
197 | size_t len; | |
198 | struct bio_vec *bvec; | |
199 | unsigned int nr_bvecs; | |
de293938 | 200 | unsigned long acct_pages; |
edafccee JA |
201 | }; |
202 | ||
50238531 BM |
203 | struct io_ring_ctx; |
204 | ||
269bbe5f BM |
205 | struct io_rsrc_put { |
206 | struct list_head list; | |
50238531 BM |
207 | union { |
208 | void *rsrc; | |
209 | struct file *file; | |
210 | }; | |
269bbe5f BM |
211 | }; |
212 | ||
213 | struct fixed_rsrc_table { | |
65e19f54 | 214 | struct file **files; |
31b51510 JA |
215 | }; |
216 | ||
269bbe5f | 217 | struct fixed_rsrc_ref_node { |
05589553 XW |
218 | struct percpu_ref refs; |
219 | struct list_head node; | |
269bbe5f BM |
220 | struct list_head rsrc_list; |
221 | struct fixed_rsrc_data *rsrc_data; | |
50238531 BM |
222 | void (*rsrc_put)(struct io_ring_ctx *ctx, |
223 | struct io_rsrc_put *prsrc); | |
4a38aed2 | 224 | struct llist_node llist; |
e297822b | 225 | bool done; |
05589553 XW |
226 | }; |
227 | ||
269bbe5f BM |
228 | struct fixed_rsrc_data { |
229 | struct fixed_rsrc_table *table; | |
05f3fb3c JA |
230 | struct io_ring_ctx *ctx; |
231 | ||
269bbe5f | 232 | struct fixed_rsrc_ref_node *node; |
05f3fb3c | 233 | struct percpu_ref refs; |
05f3fb3c | 234 | struct completion done; |
8bad28d8 | 235 | bool quiesce; |
05f3fb3c JA |
236 | }; |
237 | ||
5a2e745d JA |
238 | struct io_buffer { |
239 | struct list_head list; | |
240 | __u64 addr; | |
241 | __s32 len; | |
242 | __u16 bid; | |
243 | }; | |
244 | ||
21b55dbc SG |
245 | struct io_restriction { |
246 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
247 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
248 | u8 sqe_flags_allowed; | |
249 | u8 sqe_flags_required; | |
7e84e1c7 | 250 | bool registered; |
21b55dbc SG |
251 | }; |
252 | ||
37d1e2e3 JA |
253 | enum { |
254 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
255 | IO_SQ_THREAD_SHOULD_PARK, | |
256 | }; | |
257 | ||
534ca6d6 JA |
258 | struct io_sq_data { |
259 | refcount_t refs; | |
9e138a48 | 260 | atomic_t park_pending; |
09a6f4ef | 261 | struct mutex lock; |
69fb2131 JA |
262 | |
263 | /* ctx's that are using this sqd */ | |
264 | struct list_head ctx_list; | |
69fb2131 | 265 | |
534ca6d6 JA |
266 | struct task_struct *thread; |
267 | struct wait_queue_head wait; | |
08369246 XW |
268 | |
269 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
270 | int sq_cpu; |
271 | pid_t task_pid; | |
5c2469e0 | 272 | pid_t task_tgid; |
37d1e2e3 JA |
273 | |
274 | unsigned long state; | |
37d1e2e3 | 275 | struct completion exited; |
b7f5a0bf | 276 | struct callback_head *park_task_work; |
534ca6d6 JA |
277 | }; |
278 | ||
258b29a9 | 279 | #define IO_IOPOLL_BATCH 8 |
6dd0be1e | 280 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 281 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 282 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
283 | |
284 | struct io_comp_state { | |
6dd0be1e | 285 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 286 | unsigned int nr; |
c7dae4ba JA |
287 | unsigned int locked_free_nr; |
288 | /* inline/task_work completion list, under ->uring_lock */ | |
1b4c351f | 289 | struct list_head free_list; |
c7dae4ba JA |
290 | /* IRQ completion list, under ->completion_lock */ |
291 | struct list_head locked_free_list; | |
258b29a9 PB |
292 | }; |
293 | ||
a1ab7b35 PB |
294 | struct io_submit_link { |
295 | struct io_kiocb *head; | |
296 | struct io_kiocb *last; | |
297 | }; | |
298 | ||
258b29a9 PB |
299 | struct io_submit_state { |
300 | struct blk_plug plug; | |
a1ab7b35 | 301 | struct io_submit_link link; |
258b29a9 PB |
302 | |
303 | /* | |
304 | * io_kiocb alloc cache | |
305 | */ | |
bf019da7 | 306 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
307 | unsigned int free_reqs; |
308 | ||
309 | bool plug_started; | |
310 | ||
311 | /* | |
312 | * Batch completion logic | |
313 | */ | |
314 | struct io_comp_state comp; | |
315 | ||
316 | /* | |
317 | * File reference cache | |
318 | */ | |
319 | struct file *file; | |
320 | unsigned int fd; | |
321 | unsigned int file_refs; | |
322 | unsigned int ios_left; | |
323 | }; | |
324 | ||
2b188cc1 JA |
325 | struct io_ring_ctx { |
326 | struct { | |
327 | struct percpu_ref refs; | |
328 | } ____cacheline_aligned_in_smp; | |
329 | ||
330 | struct { | |
331 | unsigned int flags; | |
e1d85334 | 332 | unsigned int compat: 1; |
e1d85334 RD |
333 | unsigned int cq_overflow_flushed: 1; |
334 | unsigned int drain_next: 1; | |
335 | unsigned int eventfd_async: 1; | |
21b55dbc | 336 | unsigned int restricted: 1; |
2b188cc1 | 337 | |
75b28aff HV |
338 | /* |
339 | * Ring buffer of indices into array of io_uring_sqe, which is | |
340 | * mmapped by the application using the IORING_OFF_SQES offset. | |
341 | * | |
342 | * This indirection could e.g. be used to assign fixed | |
343 | * io_uring_sqe entries to operations and only submit them to | |
344 | * the queue when needed. | |
345 | * | |
346 | * The kernel modifies neither the indices array nor the entries | |
347 | * array. | |
348 | */ | |
349 | u32 *sq_array; | |
2b188cc1 JA |
350 | unsigned cached_sq_head; |
351 | unsigned sq_entries; | |
352 | unsigned sq_mask; | |
6c271ce2 | 353 | unsigned sq_thread_idle; |
498ccd9e | 354 | unsigned cached_sq_dropped; |
2c3bac6d | 355 | unsigned cached_cq_overflow; |
ad3eb2c8 | 356 | unsigned long sq_check_overflow; |
de0617e4 | 357 | |
e941894e JA |
358 | /* hashed buffered write serialization */ |
359 | struct io_wq_hash *hash_map; | |
360 | ||
de0617e4 | 361 | struct list_head defer_list; |
5262f567 | 362 | struct list_head timeout_list; |
1d7bb1d5 | 363 | struct list_head cq_overflow_list; |
fcb323cc | 364 | |
ad3eb2c8 | 365 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
366 | } ____cacheline_aligned_in_smp; |
367 | ||
3c1a2ead JA |
368 | struct { |
369 | struct mutex uring_lock; | |
370 | wait_queue_head_t wait; | |
371 | } ____cacheline_aligned_in_smp; | |
372 | ||
373 | struct io_submit_state submit_state; | |
374 | ||
206aefde JA |
375 | struct io_rings *rings; |
376 | ||
2aede0e4 JA |
377 | /* Only used for accounting purposes */ |
378 | struct mm_struct *mm_account; | |
379 | ||
7c30f36a | 380 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
381 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
382 | ||
90554200 | 383 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 384 | struct list_head sqd_list; |
75b28aff | 385 | |
6b06314c JA |
386 | /* |
387 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
388 | * readers must ensure that ->refs is alive as long as the file* is | |
389 | * used. Only updated through io_uring_register(2). | |
390 | */ | |
269bbe5f | 391 | struct fixed_rsrc_data *file_data; |
6b06314c JA |
392 | unsigned nr_user_files; |
393 | ||
edafccee JA |
394 | /* if used, fixed mapped user buffers */ |
395 | unsigned nr_user_bufs; | |
396 | struct io_mapped_ubuf *user_bufs; | |
397 | ||
2b188cc1 JA |
398 | struct user_struct *user; |
399 | ||
0f158b4c | 400 | struct completion ref_comp; |
206aefde JA |
401 | |
402 | #if defined(CONFIG_UNIX) | |
403 | struct socket *ring_sock; | |
404 | #endif | |
405 | ||
9e15c3a0 | 406 | struct xarray io_buffers; |
5a2e745d | 407 | |
61cf9370 MWO |
408 | struct xarray personalities; |
409 | u32 pers_next; | |
071698e1 | 410 | |
206aefde JA |
411 | struct { |
412 | unsigned cached_cq_tail; | |
413 | unsigned cq_entries; | |
414 | unsigned cq_mask; | |
415 | atomic_t cq_timeouts; | |
f010505b | 416 | unsigned cq_last_tm_flush; |
ad3eb2c8 | 417 | unsigned long cq_check_overflow; |
206aefde JA |
418 | struct wait_queue_head cq_wait; |
419 | struct fasync_struct *cq_fasync; | |
420 | struct eventfd_ctx *cq_ev_fd; | |
421 | } ____cacheline_aligned_in_smp; | |
2b188cc1 | 422 | |
2b188cc1 JA |
423 | struct { |
424 | spinlock_t completion_lock; | |
e94f141b | 425 | |
def596e9 | 426 | /* |
540e32a0 | 427 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
428 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
429 | * For SQPOLL, only the single threaded io_sq_thread() will | |
430 | * manipulate the list, hence no extra locking is needed there. | |
431 | */ | |
540e32a0 | 432 | struct list_head iopoll_list; |
78076bb6 JA |
433 | struct hlist_head *cancel_hash; |
434 | unsigned cancel_hash_bits; | |
e94f141b | 435 | bool poll_multi_file; |
31b51510 | 436 | |
fcb323cc JA |
437 | spinlock_t inflight_lock; |
438 | struct list_head inflight_list; | |
2b188cc1 | 439 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 440 | |
269bbe5f BM |
441 | struct delayed_work rsrc_put_work; |
442 | struct llist_head rsrc_put_llist; | |
d67d2263 BM |
443 | struct list_head rsrc_ref_list; |
444 | spinlock_t rsrc_ref_lock; | |
8dd03afe | 445 | struct fixed_rsrc_ref_node *rsrc_backup_node; |
4a38aed2 | 446 | |
21b55dbc | 447 | struct io_restriction restrictions; |
3c1a2ead | 448 | |
7c25c0d1 JA |
449 | /* exit task_work */ |
450 | struct callback_head *exit_task_work; | |
451 | ||
e941894e JA |
452 | struct wait_queue_head hash_wait; |
453 | ||
3c1a2ead JA |
454 | /* Keep this last, we don't need it for the fast path */ |
455 | struct work_struct exit_work; | |
13bf43f5 | 456 | struct list_head tctx_list; |
2b188cc1 JA |
457 | }; |
458 | ||
53e043b2 SM |
459 | struct io_uring_task { |
460 | /* submission side */ | |
461 | struct xarray xa; | |
462 | struct wait_queue_head wait; | |
ee53fb2b SM |
463 | const struct io_ring_ctx *last; |
464 | struct io_wq *io_wq; | |
53e043b2 SM |
465 | struct percpu_counter inflight; |
466 | atomic_t in_idle; | |
53e043b2 SM |
467 | |
468 | spinlock_t task_lock; | |
469 | struct io_wq_work_list task_list; | |
470 | unsigned long task_state; | |
471 | struct callback_head task_work; | |
472 | }; | |
473 | ||
09bb8394 JA |
474 | /* |
475 | * First field must be the file pointer in all the | |
476 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
477 | */ | |
221c5eb2 JA |
478 | struct io_poll_iocb { |
479 | struct file *file; | |
018043be | 480 | struct wait_queue_head *head; |
221c5eb2 | 481 | __poll_t events; |
8c838788 | 482 | bool done; |
221c5eb2 | 483 | bool canceled; |
392edb45 | 484 | struct wait_queue_entry wait; |
221c5eb2 JA |
485 | }; |
486 | ||
018043be PB |
487 | struct io_poll_remove { |
488 | struct file *file; | |
489 | u64 addr; | |
490 | }; | |
491 | ||
b5dba59e JA |
492 | struct io_close { |
493 | struct file *file; | |
b5dba59e JA |
494 | int fd; |
495 | }; | |
496 | ||
ad8a48ac JA |
497 | struct io_timeout_data { |
498 | struct io_kiocb *req; | |
499 | struct hrtimer timer; | |
500 | struct timespec64 ts; | |
501 | enum hrtimer_mode mode; | |
502 | }; | |
503 | ||
8ed8d3c3 JA |
504 | struct io_accept { |
505 | struct file *file; | |
506 | struct sockaddr __user *addr; | |
507 | int __user *addr_len; | |
508 | int flags; | |
09952e3e | 509 | unsigned long nofile; |
8ed8d3c3 JA |
510 | }; |
511 | ||
512 | struct io_sync { | |
513 | struct file *file; | |
514 | loff_t len; | |
515 | loff_t off; | |
516 | int flags; | |
d63d1b5e | 517 | int mode; |
8ed8d3c3 JA |
518 | }; |
519 | ||
fbf23849 JA |
520 | struct io_cancel { |
521 | struct file *file; | |
522 | u64 addr; | |
523 | }; | |
524 | ||
b29472ee JA |
525 | struct io_timeout { |
526 | struct file *file; | |
bfe68a22 PB |
527 | u32 off; |
528 | u32 target_seq; | |
135fcde8 | 529 | struct list_head list; |
90cd7e42 PB |
530 | /* head of the link, used by linked timeouts only */ |
531 | struct io_kiocb *head; | |
b29472ee JA |
532 | }; |
533 | ||
0bdf7a2d PB |
534 | struct io_timeout_rem { |
535 | struct file *file; | |
536 | u64 addr; | |
9c8e11b3 PB |
537 | |
538 | /* timeout update */ | |
539 | struct timespec64 ts; | |
540 | u32 flags; | |
0bdf7a2d PB |
541 | }; |
542 | ||
9adbd45d JA |
543 | struct io_rw { |
544 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
545 | struct kiocb kiocb; | |
546 | u64 addr; | |
547 | u64 len; | |
548 | }; | |
549 | ||
3fbb51c1 JA |
550 | struct io_connect { |
551 | struct file *file; | |
552 | struct sockaddr __user *addr; | |
553 | int addr_len; | |
554 | }; | |
555 | ||
e47293fd JA |
556 | struct io_sr_msg { |
557 | struct file *file; | |
fddaface | 558 | union { |
270a5940 | 559 | struct user_msghdr __user *umsg; |
fddaface JA |
560 | void __user *buf; |
561 | }; | |
e47293fd | 562 | int msg_flags; |
bcda7baa | 563 | int bgid; |
fddaface | 564 | size_t len; |
bcda7baa | 565 | struct io_buffer *kbuf; |
e47293fd JA |
566 | }; |
567 | ||
15b71abe JA |
568 | struct io_open { |
569 | struct file *file; | |
570 | int dfd; | |
15b71abe | 571 | struct filename *filename; |
c12cedf2 | 572 | struct open_how how; |
4022e7af | 573 | unsigned long nofile; |
15b71abe JA |
574 | }; |
575 | ||
269bbe5f | 576 | struct io_rsrc_update { |
05f3fb3c JA |
577 | struct file *file; |
578 | u64 arg; | |
579 | u32 nr_args; | |
580 | u32 offset; | |
581 | }; | |
582 | ||
4840e418 JA |
583 | struct io_fadvise { |
584 | struct file *file; | |
585 | u64 offset; | |
586 | u32 len; | |
587 | u32 advice; | |
588 | }; | |
589 | ||
c1ca757b JA |
590 | struct io_madvise { |
591 | struct file *file; | |
592 | u64 addr; | |
593 | u32 len; | |
594 | u32 advice; | |
595 | }; | |
596 | ||
3e4827b0 JA |
597 | struct io_epoll { |
598 | struct file *file; | |
599 | int epfd; | |
600 | int op; | |
601 | int fd; | |
602 | struct epoll_event event; | |
e47293fd JA |
603 | }; |
604 | ||
7d67af2c PB |
605 | struct io_splice { |
606 | struct file *file_out; | |
607 | struct file *file_in; | |
608 | loff_t off_out; | |
609 | loff_t off_in; | |
610 | u64 len; | |
611 | unsigned int flags; | |
612 | }; | |
613 | ||
ddf0322d JA |
614 | struct io_provide_buf { |
615 | struct file *file; | |
616 | __u64 addr; | |
617 | __s32 len; | |
618 | __u32 bgid; | |
619 | __u16 nbufs; | |
620 | __u16 bid; | |
621 | }; | |
622 | ||
1d9e1288 BM |
623 | struct io_statx { |
624 | struct file *file; | |
625 | int dfd; | |
626 | unsigned int mask; | |
627 | unsigned int flags; | |
e62753e4 | 628 | const char __user *filename; |
1d9e1288 BM |
629 | struct statx __user *buffer; |
630 | }; | |
631 | ||
36f4fa68 JA |
632 | struct io_shutdown { |
633 | struct file *file; | |
634 | int how; | |
635 | }; | |
636 | ||
80a261fd JA |
637 | struct io_rename { |
638 | struct file *file; | |
639 | int old_dfd; | |
640 | int new_dfd; | |
641 | struct filename *oldpath; | |
642 | struct filename *newpath; | |
643 | int flags; | |
644 | }; | |
645 | ||
14a1143b JA |
646 | struct io_unlink { |
647 | struct file *file; | |
648 | int dfd; | |
649 | int flags; | |
650 | struct filename *filename; | |
651 | }; | |
652 | ||
3ca405eb PB |
653 | struct io_completion { |
654 | struct file *file; | |
655 | struct list_head list; | |
8c3f9cd1 | 656 | u32 cflags; |
3ca405eb PB |
657 | }; |
658 | ||
f499a021 JA |
659 | struct io_async_connect { |
660 | struct sockaddr_storage address; | |
661 | }; | |
662 | ||
03b1230c JA |
663 | struct io_async_msghdr { |
664 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
665 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
666 | struct iovec *free_iov; | |
03b1230c JA |
667 | struct sockaddr __user *uaddr; |
668 | struct msghdr msg; | |
b537916c | 669 | struct sockaddr_storage addr; |
03b1230c JA |
670 | }; |
671 | ||
f67676d1 JA |
672 | struct io_async_rw { |
673 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
674 | const struct iovec *free_iovec; |
675 | struct iov_iter iter; | |
227c0c96 | 676 | size_t bytes_done; |
bcf5a063 | 677 | struct wait_page_queue wpq; |
f67676d1 JA |
678 | }; |
679 | ||
6b47ee6e PB |
680 | enum { |
681 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
682 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
683 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
684 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
685 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 686 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 687 | |
6b47ee6e PB |
688 | REQ_F_FAIL_LINK_BIT, |
689 | REQ_F_INFLIGHT_BIT, | |
690 | REQ_F_CUR_POS_BIT, | |
691 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 692 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 693 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 694 | REQ_F_POLLED_BIT, |
bcda7baa | 695 | REQ_F_BUFFER_SELECTED_BIT, |
900fad45 | 696 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 697 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 698 | REQ_F_REISSUE_BIT, |
8c130827 | 699 | REQ_F_DONT_REISSUE_BIT, |
7b29f92d JA |
700 | /* keep async read/write and isreg together and in order */ |
701 | REQ_F_ASYNC_READ_BIT, | |
702 | REQ_F_ASYNC_WRITE_BIT, | |
703 | REQ_F_ISREG_BIT, | |
84557871 JA |
704 | |
705 | /* not a real bit, just to check we're not overflowing the space */ | |
706 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
707 | }; |
708 | ||
709 | enum { | |
710 | /* ctx owns file */ | |
711 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
712 | /* drain existing IO first */ | |
713 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
714 | /* linked sqes */ | |
715 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
716 | /* doesn't sever on completion < 0 */ | |
717 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
718 | /* IOSQE_ASYNC */ | |
719 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
720 | /* IOSQE_BUFFER_SELECT */ |
721 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 722 | |
6b47ee6e PB |
723 | /* fail rest of links */ |
724 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
b05a1bcd | 725 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
726 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
727 | /* read/write uses file position */ | |
728 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
729 | /* must not punt to workers */ | |
730 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 731 | /* has or had linked timeout */ |
6b47ee6e | 732 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
733 | /* needs cleanup */ |
734 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
735 | /* already went through poll handler */ |
736 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
737 | /* buffer already selected */ |
738 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
900fad45 PB |
739 | /* linked timeout is active, i.e. prepared by link's head */ |
740 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
741 | /* completion is deferred through io_comp_state */ |
742 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
743 | /* caller should reissue async */ |
744 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
745 | /* don't attempt request reissue, see io_rw_reissue() */ |
746 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d JA |
747 | /* supports async reads */ |
748 | REQ_F_ASYNC_READ = BIT(REQ_F_ASYNC_READ_BIT), | |
749 | /* supports async writes */ | |
750 | REQ_F_ASYNC_WRITE = BIT(REQ_F_ASYNC_WRITE_BIT), | |
751 | /* regular file */ | |
752 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
d7718a9d JA |
753 | }; |
754 | ||
755 | struct async_poll { | |
756 | struct io_poll_iocb poll; | |
807abcb0 | 757 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
758 | }; |
759 | ||
7cbf1722 JA |
760 | struct io_task_work { |
761 | struct io_wq_work_node node; | |
762 | task_work_func_t func; | |
763 | }; | |
764 | ||
09bb8394 JA |
765 | /* |
766 | * NOTE! Each of the iocb union members has the file pointer | |
767 | * as the first entry in their struct definition. So you can | |
768 | * access the file pointer through any of the sub-structs, | |
769 | * or directly as just 'ki_filp' in this struct. | |
770 | */ | |
2b188cc1 | 771 | struct io_kiocb { |
221c5eb2 | 772 | union { |
09bb8394 | 773 | struct file *file; |
9adbd45d | 774 | struct io_rw rw; |
221c5eb2 | 775 | struct io_poll_iocb poll; |
018043be | 776 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
777 | struct io_accept accept; |
778 | struct io_sync sync; | |
fbf23849 | 779 | struct io_cancel cancel; |
b29472ee | 780 | struct io_timeout timeout; |
0bdf7a2d | 781 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 782 | struct io_connect connect; |
e47293fd | 783 | struct io_sr_msg sr_msg; |
15b71abe | 784 | struct io_open open; |
b5dba59e | 785 | struct io_close close; |
269bbe5f | 786 | struct io_rsrc_update rsrc_update; |
4840e418 | 787 | struct io_fadvise fadvise; |
c1ca757b | 788 | struct io_madvise madvise; |
3e4827b0 | 789 | struct io_epoll epoll; |
7d67af2c | 790 | struct io_splice splice; |
ddf0322d | 791 | struct io_provide_buf pbuf; |
1d9e1288 | 792 | struct io_statx statx; |
36f4fa68 | 793 | struct io_shutdown shutdown; |
80a261fd | 794 | struct io_rename rename; |
14a1143b | 795 | struct io_unlink unlink; |
3ca405eb PB |
796 | /* use only after cleaning per-op data, see io_clean_op() */ |
797 | struct io_completion compl; | |
221c5eb2 | 798 | }; |
2b188cc1 | 799 | |
e8c2bc1f JA |
800 | /* opcode allocated if it needs to store data for async defer */ |
801 | void *async_data; | |
d625c6ee | 802 | u8 opcode; |
65a6543d XW |
803 | /* polled IO has completed */ |
804 | u8 iopoll_completed; | |
2b188cc1 | 805 | |
4f4eeba8 | 806 | u16 buf_index; |
9cf7c104 | 807 | u32 result; |
4f4eeba8 | 808 | |
010e8e6b PB |
809 | struct io_ring_ctx *ctx; |
810 | unsigned int flags; | |
abc54d63 | 811 | atomic_t refs; |
010e8e6b PB |
812 | struct task_struct *task; |
813 | u64 user_data; | |
d7718a9d | 814 | |
f2f87370 | 815 | struct io_kiocb *link; |
269bbe5f | 816 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 817 | |
d21ffe7e PB |
818 | /* |
819 | * 1. used with ctx->iopoll_list with reads/writes | |
820 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
821 | */ | |
010e8e6b | 822 | struct list_head inflight_entry; |
7cbf1722 JA |
823 | union { |
824 | struct io_task_work io_task_work; | |
825 | struct callback_head task_work; | |
826 | }; | |
010e8e6b PB |
827 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
828 | struct hlist_node hash_node; | |
829 | struct async_poll *apoll; | |
830 | struct io_wq_work work; | |
2b188cc1 | 831 | }; |
05589553 | 832 | |
13bf43f5 PB |
833 | struct io_tctx_node { |
834 | struct list_head ctx_node; | |
835 | struct task_struct *task; | |
13bf43f5 PB |
836 | struct io_ring_ctx *ctx; |
837 | }; | |
838 | ||
27dc8338 PB |
839 | struct io_defer_entry { |
840 | struct list_head list; | |
841 | struct io_kiocb *req; | |
9cf7c104 | 842 | u32 seq; |
2b188cc1 JA |
843 | }; |
844 | ||
d3656344 | 845 | struct io_op_def { |
d3656344 JA |
846 | /* needs req->file assigned */ |
847 | unsigned needs_file : 1; | |
d3656344 JA |
848 | /* hash wq insertion if file is a regular file */ |
849 | unsigned hash_reg_file : 1; | |
850 | /* unbound wq insertion if file is a non-regular file */ | |
851 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
852 | /* opcode is not supported by this kernel */ |
853 | unsigned not_supported : 1; | |
8a72758c JA |
854 | /* set if opcode supports polled "wait" */ |
855 | unsigned pollin : 1; | |
856 | unsigned pollout : 1; | |
bcda7baa JA |
857 | /* op supports buffer selection */ |
858 | unsigned buffer_select : 1; | |
26f0505a PB |
859 | /* do prep async if is going to be punted */ |
860 | unsigned needs_async_setup : 1; | |
27926b68 JA |
861 | /* should block plug */ |
862 | unsigned plug : 1; | |
e8c2bc1f JA |
863 | /* size of async data needed, if any */ |
864 | unsigned short async_size; | |
d3656344 JA |
865 | }; |
866 | ||
0918682b | 867 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
868 | [IORING_OP_NOP] = {}, |
869 | [IORING_OP_READV] = { | |
d3656344 JA |
870 | .needs_file = 1, |
871 | .unbound_nonreg_file = 1, | |
8a72758c | 872 | .pollin = 1, |
4d954c25 | 873 | .buffer_select = 1, |
26f0505a | 874 | .needs_async_setup = 1, |
27926b68 | 875 | .plug = 1, |
e8c2bc1f | 876 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 877 | }, |
0463b6c5 | 878 | [IORING_OP_WRITEV] = { |
d3656344 JA |
879 | .needs_file = 1, |
880 | .hash_reg_file = 1, | |
881 | .unbound_nonreg_file = 1, | |
8a72758c | 882 | .pollout = 1, |
26f0505a | 883 | .needs_async_setup = 1, |
27926b68 | 884 | .plug = 1, |
e8c2bc1f | 885 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 886 | }, |
0463b6c5 | 887 | [IORING_OP_FSYNC] = { |
d3656344 JA |
888 | .needs_file = 1, |
889 | }, | |
0463b6c5 | 890 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
891 | .needs_file = 1, |
892 | .unbound_nonreg_file = 1, | |
8a72758c | 893 | .pollin = 1, |
27926b68 | 894 | .plug = 1, |
e8c2bc1f | 895 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 896 | }, |
0463b6c5 | 897 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
898 | .needs_file = 1, |
899 | .hash_reg_file = 1, | |
900 | .unbound_nonreg_file = 1, | |
8a72758c | 901 | .pollout = 1, |
27926b68 | 902 | .plug = 1, |
e8c2bc1f | 903 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 904 | }, |
0463b6c5 | 905 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
906 | .needs_file = 1, |
907 | .unbound_nonreg_file = 1, | |
908 | }, | |
0463b6c5 PB |
909 | [IORING_OP_POLL_REMOVE] = {}, |
910 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
911 | .needs_file = 1, |
912 | }, | |
0463b6c5 | 913 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
914 | .needs_file = 1, |
915 | .unbound_nonreg_file = 1, | |
8a72758c | 916 | .pollout = 1, |
26f0505a | 917 | .needs_async_setup = 1, |
e8c2bc1f | 918 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 919 | }, |
0463b6c5 | 920 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
921 | .needs_file = 1, |
922 | .unbound_nonreg_file = 1, | |
8a72758c | 923 | .pollin = 1, |
52de1fe1 | 924 | .buffer_select = 1, |
26f0505a | 925 | .needs_async_setup = 1, |
e8c2bc1f | 926 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 927 | }, |
0463b6c5 | 928 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 929 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 930 | }, |
9c8e11b3 PB |
931 | [IORING_OP_TIMEOUT_REMOVE] = { |
932 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 933 | }, |
0463b6c5 | 934 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
935 | .needs_file = 1, |
936 | .unbound_nonreg_file = 1, | |
8a72758c | 937 | .pollin = 1, |
d3656344 | 938 | }, |
0463b6c5 PB |
939 | [IORING_OP_ASYNC_CANCEL] = {}, |
940 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 941 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 942 | }, |
0463b6c5 | 943 | [IORING_OP_CONNECT] = { |
d3656344 JA |
944 | .needs_file = 1, |
945 | .unbound_nonreg_file = 1, | |
8a72758c | 946 | .pollout = 1, |
26f0505a | 947 | .needs_async_setup = 1, |
e8c2bc1f | 948 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 949 | }, |
0463b6c5 | 950 | [IORING_OP_FALLOCATE] = { |
d3656344 | 951 | .needs_file = 1, |
d3656344 | 952 | }, |
44526bed JA |
953 | [IORING_OP_OPENAT] = {}, |
954 | [IORING_OP_CLOSE] = {}, | |
955 | [IORING_OP_FILES_UPDATE] = {}, | |
956 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 957 | [IORING_OP_READ] = { |
3a6820f2 JA |
958 | .needs_file = 1, |
959 | .unbound_nonreg_file = 1, | |
8a72758c | 960 | .pollin = 1, |
bcda7baa | 961 | .buffer_select = 1, |
27926b68 | 962 | .plug = 1, |
e8c2bc1f | 963 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 964 | }, |
0463b6c5 | 965 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
966 | .needs_file = 1, |
967 | .unbound_nonreg_file = 1, | |
8a72758c | 968 | .pollout = 1, |
27926b68 | 969 | .plug = 1, |
e8c2bc1f | 970 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 971 | }, |
0463b6c5 | 972 | [IORING_OP_FADVISE] = { |
4840e418 | 973 | .needs_file = 1, |
c1ca757b | 974 | }, |
44526bed | 975 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 976 | [IORING_OP_SEND] = { |
fddaface JA |
977 | .needs_file = 1, |
978 | .unbound_nonreg_file = 1, | |
8a72758c | 979 | .pollout = 1, |
fddaface | 980 | }, |
0463b6c5 | 981 | [IORING_OP_RECV] = { |
fddaface JA |
982 | .needs_file = 1, |
983 | .unbound_nonreg_file = 1, | |
8a72758c | 984 | .pollin = 1, |
bcda7baa | 985 | .buffer_select = 1, |
fddaface | 986 | }, |
0463b6c5 | 987 | [IORING_OP_OPENAT2] = { |
cebdb986 | 988 | }, |
3e4827b0 JA |
989 | [IORING_OP_EPOLL_CTL] = { |
990 | .unbound_nonreg_file = 1, | |
3e4827b0 | 991 | }, |
7d67af2c PB |
992 | [IORING_OP_SPLICE] = { |
993 | .needs_file = 1, | |
994 | .hash_reg_file = 1, | |
995 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
996 | }, |
997 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 998 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
999 | [IORING_OP_TEE] = { |
1000 | .needs_file = 1, | |
1001 | .hash_reg_file = 1, | |
1002 | .unbound_nonreg_file = 1, | |
1003 | }, | |
36f4fa68 JA |
1004 | [IORING_OP_SHUTDOWN] = { |
1005 | .needs_file = 1, | |
1006 | }, | |
44526bed JA |
1007 | [IORING_OP_RENAMEAT] = {}, |
1008 | [IORING_OP_UNLINKAT] = {}, | |
d3656344 JA |
1009 | }; |
1010 | ||
7a612350 | 1011 | static bool io_disarm_next(struct io_kiocb *req); |
d56d938b | 1012 | static void io_uring_del_task_file(unsigned long index); |
9936c7c2 PB |
1013 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1014 | struct task_struct *task, | |
1015 | struct files_struct *files); | |
37d1e2e3 | 1016 | static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx); |
269bbe5f | 1017 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node); |
bc9744cd | 1018 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
1ffc5422 | 1019 | struct io_ring_ctx *ctx); |
f2303b1f | 1020 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
1ffc5422 | 1021 | |
78e19bbe | 1022 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 1023 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1024 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c7dae4ba JA |
1025 | static void io_dismantle_req(struct io_kiocb *req); |
1026 | static void io_put_task(struct task_struct *task, int nr); | |
1027 | static void io_queue_next(struct io_kiocb *req); | |
94ae5e77 JA |
1028 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
1029 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c | 1030 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 1031 | struct io_uring_rsrc_update *ip, |
05f3fb3c | 1032 | unsigned nr_args); |
68fb8979 | 1033 | static void io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1034 | static struct file *io_file_get(struct io_submit_state *state, |
1035 | struct io_kiocb *req, int fd, bool fixed); | |
c5eef2b9 | 1036 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1037 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1038 | |
907d1df3 | 1039 | static void io_req_task_queue(struct io_kiocb *req); |
65453d1e JA |
1040 | static void io_submit_flush_completions(struct io_comp_state *cs, |
1041 | struct io_ring_ctx *ctx); | |
179ae0d1 | 1042 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1043 | |
2b188cc1 JA |
1044 | static struct kmem_cache *req_cachep; |
1045 | ||
0918682b | 1046 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1047 | |
1048 | struct sock *io_uring_get_socket(struct file *file) | |
1049 | { | |
1050 | #if defined(CONFIG_UNIX) | |
1051 | if (file->f_op == &io_uring_fops) { | |
1052 | struct io_ring_ctx *ctx = file->private_data; | |
1053 | ||
1054 | return ctx->ring_sock->sk; | |
1055 | } | |
1056 | #endif | |
1057 | return NULL; | |
1058 | } | |
1059 | EXPORT_SYMBOL(io_uring_get_socket); | |
1060 | ||
f2f87370 PB |
1061 | #define io_for_each_link(pos, head) \ |
1062 | for (pos = (head); pos; pos = pos->link) | |
1063 | ||
36f72fe2 PB |
1064 | static inline void io_set_resource_node(struct io_kiocb *req) |
1065 | { | |
1066 | struct io_ring_ctx *ctx = req->ctx; | |
1067 | ||
269bbe5f BM |
1068 | if (!req->fixed_rsrc_refs) { |
1069 | req->fixed_rsrc_refs = &ctx->file_data->node->refs; | |
1070 | percpu_ref_get(req->fixed_rsrc_refs); | |
36f72fe2 PB |
1071 | } |
1072 | } | |
1073 | ||
08d23634 PB |
1074 | static bool io_match_task(struct io_kiocb *head, |
1075 | struct task_struct *task, | |
1076 | struct files_struct *files) | |
1077 | { | |
1078 | struct io_kiocb *req; | |
1079 | ||
68207680 | 1080 | if (task && head->task != task) |
08d23634 PB |
1081 | return false; |
1082 | if (!files) | |
1083 | return true; | |
1084 | ||
1085 | io_for_each_link(req, head) { | |
b05a1bcd | 1086 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1087 | return true; |
08d23634 PB |
1088 | } |
1089 | return false; | |
1090 | } | |
1091 | ||
c40f6379 JA |
1092 | static inline void req_set_fail_links(struct io_kiocb *req) |
1093 | { | |
1094 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1095 | req->flags |= REQ_F_FAIL_LINK; | |
1096 | } | |
4a38aed2 | 1097 | |
2b188cc1 JA |
1098 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1099 | { | |
1100 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1101 | ||
0f158b4c | 1102 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1103 | } |
1104 | ||
8eb7e2d0 PB |
1105 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1106 | { | |
1107 | return !req->timeout.off; | |
1108 | } | |
1109 | ||
2b188cc1 JA |
1110 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1111 | { | |
1112 | struct io_ring_ctx *ctx; | |
78076bb6 | 1113 | int hash_bits; |
2b188cc1 JA |
1114 | |
1115 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1116 | if (!ctx) | |
1117 | return NULL; | |
1118 | ||
78076bb6 JA |
1119 | /* |
1120 | * Use 5 bits less than the max cq entries, that should give us around | |
1121 | * 32 entries per hash list if totally full and uniformly spread. | |
1122 | */ | |
1123 | hash_bits = ilog2(p->cq_entries); | |
1124 | hash_bits -= 5; | |
1125 | if (hash_bits <= 0) | |
1126 | hash_bits = 1; | |
1127 | ctx->cancel_hash_bits = hash_bits; | |
1128 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1129 | GFP_KERNEL); | |
1130 | if (!ctx->cancel_hash) | |
1131 | goto err; | |
1132 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1133 | ||
21482896 | 1134 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1135 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1136 | goto err; | |
2b188cc1 JA |
1137 | |
1138 | ctx->flags = p->flags; | |
90554200 | 1139 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1140 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1141 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1142 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1143 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1144 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1145 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 JA |
1146 | mutex_init(&ctx->uring_lock); |
1147 | init_waitqueue_head(&ctx->wait); | |
1148 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1149 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1150 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1151 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1152 | spin_lock_init(&ctx->inflight_lock); |
1153 | INIT_LIST_HEAD(&ctx->inflight_list); | |
d67d2263 BM |
1154 | spin_lock_init(&ctx->rsrc_ref_lock); |
1155 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1156 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1157 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1158 | INIT_LIST_HEAD(&ctx->tctx_list); |
1b4c351f | 1159 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
c7dae4ba | 1160 | INIT_LIST_HEAD(&ctx->submit_state.comp.locked_free_list); |
2b188cc1 | 1161 | return ctx; |
206aefde | 1162 | err: |
78076bb6 | 1163 | kfree(ctx->cancel_hash); |
206aefde JA |
1164 | kfree(ctx); |
1165 | return NULL; | |
2b188cc1 JA |
1166 | } |
1167 | ||
9cf7c104 | 1168 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1169 | { |
2bc9930e JA |
1170 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1171 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1172 | |
9cf7c104 | 1173 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1174 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1175 | } |
de0617e4 | 1176 | |
9d858b21 | 1177 | return false; |
de0617e4 JA |
1178 | } |
1179 | ||
ce3d5aae PB |
1180 | static void io_req_track_inflight(struct io_kiocb *req) |
1181 | { | |
1182 | struct io_ring_ctx *ctx = req->ctx; | |
1183 | ||
1184 | if (!(req->flags & REQ_F_INFLIGHT)) { | |
ce3d5aae PB |
1185 | req->flags |= REQ_F_INFLIGHT; |
1186 | ||
1187 | spin_lock_irq(&ctx->inflight_lock); | |
1188 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1189 | spin_unlock_irq(&ctx->inflight_lock); | |
1190 | } | |
1191 | } | |
1192 | ||
1e6fa521 JA |
1193 | static void io_prep_async_work(struct io_kiocb *req) |
1194 | { | |
1195 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1196 | struct io_ring_ctx *ctx = req->ctx; |
1197 | ||
003e8dcc JA |
1198 | if (!req->work.creds) |
1199 | req->work.creds = get_current_cred(); | |
1200 | ||
e1d675df PB |
1201 | req->work.list.next = NULL; |
1202 | req->work.flags = 0; | |
feaadc4f PB |
1203 | if (req->flags & REQ_F_FORCE_ASYNC) |
1204 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1205 | ||
1e6fa521 JA |
1206 | if (req->flags & REQ_F_ISREG) { |
1207 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1208 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1209 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1210 | if (def->unbound_nonreg_file) |
1211 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1212 | } | |
e1d675df PB |
1213 | |
1214 | switch (req->opcode) { | |
1215 | case IORING_OP_SPLICE: | |
1216 | case IORING_OP_TEE: | |
1217 | /* | |
1218 | * Splice operation will be punted aync, and here need to | |
1219 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
1220 | */ | |
1221 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) | |
1222 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1223 | break; | |
1224 | } | |
561fb04a | 1225 | } |
cccf0ee8 | 1226 | |
cbdcb435 | 1227 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1228 | { |
cbdcb435 | 1229 | struct io_kiocb *cur; |
54a91f3b | 1230 | |
f2f87370 PB |
1231 | io_for_each_link(cur, req) |
1232 | io_prep_async_work(cur); | |
561fb04a JA |
1233 | } |
1234 | ||
ebf93667 | 1235 | static void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1236 | { |
a197f664 | 1237 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1238 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1239 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1240 | |
3bfe6106 JA |
1241 | BUG_ON(!tctx); |
1242 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1243 | |
cbdcb435 PB |
1244 | /* init ->work of the whole link before punting */ |
1245 | io_prep_async_link(req); | |
d07f1e8a PB |
1246 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1247 | &req->work, req->flags); | |
ebf93667 | 1248 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1249 | if (link) |
1250 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1251 | } |
1252 | ||
1ee4160c | 1253 | static void io_kill_timeout(struct io_kiocb *req, int status) |
5262f567 | 1254 | { |
e8c2bc1f | 1255 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1256 | int ret; |
1257 | ||
e8c2bc1f | 1258 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1259 | if (ret != -1) { |
01cec8c1 PB |
1260 | atomic_set(&req->ctx->cq_timeouts, |
1261 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1262 | list_del_init(&req->timeout.list); |
1ee4160c | 1263 | io_cqring_fill_event(req, status); |
216578e5 | 1264 | io_put_req_deferred(req, 1); |
5262f567 JA |
1265 | } |
1266 | } | |
1267 | ||
04518945 | 1268 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1269 | { |
04518945 | 1270 | do { |
27dc8338 PB |
1271 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1272 | struct io_defer_entry, list); | |
de0617e4 | 1273 | |
9cf7c104 | 1274 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1275 | break; |
27dc8338 | 1276 | list_del_init(&de->list); |
907d1df3 | 1277 | io_req_task_queue(de->req); |
27dc8338 | 1278 | kfree(de); |
04518945 PB |
1279 | } while (!list_empty(&ctx->defer_list)); |
1280 | } | |
1281 | ||
360428f8 | 1282 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1283 | { |
f010505b MDG |
1284 | u32 seq; |
1285 | ||
1286 | if (list_empty(&ctx->timeout_list)) | |
1287 | return; | |
1288 | ||
1289 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
1290 | ||
1291 | do { | |
1292 | u32 events_needed, events_got; | |
360428f8 | 1293 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1294 | struct io_kiocb, timeout.list); |
de0617e4 | 1295 | |
8eb7e2d0 | 1296 | if (io_is_timeout_noseq(req)) |
360428f8 | 1297 | break; |
f010505b MDG |
1298 | |
1299 | /* | |
1300 | * Since seq can easily wrap around over time, subtract | |
1301 | * the last seq at which timeouts were flushed before comparing. | |
1302 | * Assuming not more than 2^31-1 events have happened since, | |
1303 | * these subtractions won't have wrapped, so we can check if | |
1304 | * target is in [last_seq, current_seq] by comparing the two. | |
1305 | */ | |
1306 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1307 | events_got = seq - ctx->cq_last_tm_flush; | |
1308 | if (events_got < events_needed) | |
360428f8 | 1309 | break; |
bfe68a22 | 1310 | |
135fcde8 | 1311 | list_del_init(&req->timeout.list); |
1ee4160c | 1312 | io_kill_timeout(req, 0); |
f010505b MDG |
1313 | } while (!list_empty(&ctx->timeout_list)); |
1314 | ||
1315 | ctx->cq_last_tm_flush = seq; | |
360428f8 | 1316 | } |
5262f567 | 1317 | |
360428f8 PB |
1318 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1319 | { | |
1320 | io_flush_timeouts(ctx); | |
ec30e04b PB |
1321 | |
1322 | /* order cqe stores with ring update */ | |
1323 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 | 1324 | |
04518945 PB |
1325 | if (unlikely(!list_empty(&ctx->defer_list))) |
1326 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1327 | } |
1328 | ||
90554200 JA |
1329 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1330 | { | |
1331 | struct io_rings *r = ctx->rings; | |
1332 | ||
1333 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1334 | } | |
1335 | ||
888aae2e PB |
1336 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1337 | { | |
1338 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1339 | } | |
1340 | ||
2b188cc1 JA |
1341 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1342 | { | |
75b28aff | 1343 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1344 | unsigned tail; |
1345 | ||
115e12e5 SB |
1346 | /* |
1347 | * writes to the cq entry need to come after reading head; the | |
1348 | * control dependency is enough as we're using WRITE_ONCE to | |
1349 | * fill the cq entry | |
1350 | */ | |
888aae2e | 1351 | if (__io_cqring_events(ctx) == rings->cq_ring_entries) |
2b188cc1 JA |
1352 | return NULL; |
1353 | ||
888aae2e | 1354 | tail = ctx->cached_cq_tail++; |
75b28aff | 1355 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1356 | } |
1357 | ||
f2842ab5 JA |
1358 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1359 | { | |
f0b493e6 JA |
1360 | if (!ctx->cq_ev_fd) |
1361 | return false; | |
7e55a19c SG |
1362 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1363 | return false; | |
f2842ab5 JA |
1364 | if (!ctx->eventfd_async) |
1365 | return true; | |
b41e9852 | 1366 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1367 | } |
1368 | ||
b41e9852 | 1369 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1370 | { |
b1445e59 PB |
1371 | /* see waitqueue_active() comment */ |
1372 | smp_mb(); | |
1373 | ||
1d7bb1d5 JA |
1374 | if (waitqueue_active(&ctx->wait)) |
1375 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1376 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1377 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1378 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1379 | eventfd_signal(ctx->cq_ev_fd, 1); |
b1445e59 | 1380 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1381 | wake_up_interruptible(&ctx->cq_wait); |
1382 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1383 | } | |
1d7bb1d5 JA |
1384 | } |
1385 | ||
80c18e4a PB |
1386 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1387 | { | |
b1445e59 PB |
1388 | /* see waitqueue_active() comment */ |
1389 | smp_mb(); | |
1390 | ||
80c18e4a PB |
1391 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1392 | if (waitqueue_active(&ctx->wait)) | |
1393 | wake_up(&ctx->wait); | |
1394 | } | |
1395 | if (io_should_trigger_evfd(ctx)) | |
1396 | eventfd_signal(ctx->cq_ev_fd, 1); | |
b1445e59 | 1397 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1398 | wake_up_interruptible(&ctx->cq_wait); |
1399 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1400 | } | |
80c18e4a PB |
1401 | } |
1402 | ||
c4a2ed72 | 1403 | /* Returns true if there are no backlogged entries after the flush */ |
6c503150 PB |
1404 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1405 | struct task_struct *tsk, | |
1406 | struct files_struct *files) | |
1d7bb1d5 JA |
1407 | { |
1408 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1409 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1410 | struct io_uring_cqe *cqe; |
1d7bb1d5 | 1411 | unsigned long flags; |
b18032bb | 1412 | bool all_flushed, posted; |
1d7bb1d5 JA |
1413 | LIST_HEAD(list); |
1414 | ||
e23de15f PB |
1415 | if (!force && __io_cqring_events(ctx) == rings->cq_ring_entries) |
1416 | return false; | |
1d7bb1d5 | 1417 | |
b18032bb | 1418 | posted = false; |
1d7bb1d5 | 1419 | spin_lock_irqsave(&ctx->completion_lock, flags); |
e6c8aa9a | 1420 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1421 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1422 | continue; |
1423 | ||
1d7bb1d5 JA |
1424 | cqe = io_get_cqring(ctx); |
1425 | if (!cqe && !force) | |
1426 | break; | |
1427 | ||
40d8ddd4 | 1428 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1429 | if (cqe) { |
1430 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1431 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1432 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1433 | } else { |
2c3bac6d | 1434 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1435 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1436 | ctx->cached_cq_overflow); |
1d7bb1d5 | 1437 | } |
b18032bb | 1438 | posted = true; |
1d7bb1d5 JA |
1439 | } |
1440 | ||
09e88404 PB |
1441 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1442 | if (all_flushed) { | |
1443 | clear_bit(0, &ctx->sq_check_overflow); | |
1444 | clear_bit(0, &ctx->cq_check_overflow); | |
1445 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1446 | } | |
46930143 | 1447 | |
b18032bb JA |
1448 | if (posted) |
1449 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1450 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1451 | if (posted) |
1452 | io_cqring_ev_posted(ctx); | |
1d7bb1d5 JA |
1453 | |
1454 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1455 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1456 | list_del(&req->compl.list); | |
ec9c02ad | 1457 | io_put_req(req); |
1d7bb1d5 | 1458 | } |
c4a2ed72 | 1459 | |
09e88404 | 1460 | return all_flushed; |
1d7bb1d5 JA |
1461 | } |
1462 | ||
ca0a2651 | 1463 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
6c503150 PB |
1464 | struct task_struct *tsk, |
1465 | struct files_struct *files) | |
1466 | { | |
ca0a2651 JA |
1467 | bool ret = true; |
1468 | ||
6c503150 PB |
1469 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1470 | /* iopoll syncs against uring_lock, not completion_lock */ | |
1471 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1472 | mutex_lock(&ctx->uring_lock); | |
ca0a2651 | 1473 | ret = __io_cqring_overflow_flush(ctx, force, tsk, files); |
6c503150 PB |
1474 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1475 | mutex_unlock(&ctx->uring_lock); | |
1476 | } | |
ca0a2651 JA |
1477 | |
1478 | return ret; | |
6c503150 PB |
1479 | } |
1480 | ||
abc54d63 JA |
1481 | /* |
1482 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1483 | * see commit f958d7b528b1 for details. | |
1484 | */ | |
1485 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1486 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1487 | ||
de9b4cca JA |
1488 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) |
1489 | { | |
abc54d63 | 1490 | return atomic_inc_not_zero(&req->refs); |
de9b4cca JA |
1491 | } |
1492 | ||
1493 | static inline bool req_ref_sub_and_test(struct io_kiocb *req, int refs) | |
1494 | { | |
abc54d63 JA |
1495 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1496 | return atomic_sub_and_test(refs, &req->refs); | |
de9b4cca JA |
1497 | } |
1498 | ||
1499 | static inline bool req_ref_put_and_test(struct io_kiocb *req) | |
1500 | { | |
abc54d63 JA |
1501 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1502 | return atomic_dec_and_test(&req->refs); | |
de9b4cca JA |
1503 | } |
1504 | ||
1505 | static inline void req_ref_put(struct io_kiocb *req) | |
1506 | { | |
abc54d63 | 1507 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
de9b4cca JA |
1508 | } |
1509 | ||
1510 | static inline void req_ref_get(struct io_kiocb *req) | |
1511 | { | |
abc54d63 JA |
1512 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1513 | atomic_inc(&req->refs); | |
de9b4cca JA |
1514 | } |
1515 | ||
8c3f9cd1 PB |
1516 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, |
1517 | unsigned int cflags) | |
2b188cc1 | 1518 | { |
78e19bbe | 1519 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1520 | struct io_uring_cqe *cqe; |
1521 | ||
78e19bbe | 1522 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1523 | |
2b188cc1 JA |
1524 | /* |
1525 | * If we can't get a cq entry, userspace overflowed the | |
1526 | * submission (by quite a lot). Increment the overflow count in | |
1527 | * the ring. | |
1528 | */ | |
1529 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1530 | if (likely(cqe)) { |
78e19bbe | 1531 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1532 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1533 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1534 | } else if (ctx->cq_overflow_flushed || |
1535 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1536 | /* |
1537 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1538 | * then we cannot store the request for later flushing, we need | |
1539 | * to drop it on the floor. | |
1540 | */ | |
2c3bac6d PB |
1541 | ctx->cached_cq_overflow++; |
1542 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1543 | } else { |
ad3eb2c8 JA |
1544 | if (list_empty(&ctx->cq_overflow_list)) { |
1545 | set_bit(0, &ctx->sq_check_overflow); | |
1546 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1547 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1548 | } |
68fb8979 PB |
1549 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
1550 | io_clean_op(req); | |
1551 | ||
1d7bb1d5 | 1552 | req->result = res; |
0f7e466b | 1553 | req->compl.cflags = cflags; |
de9b4cca | 1554 | req_ref_get(req); |
40d8ddd4 | 1555 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1556 | } |
1557 | } | |
1558 | ||
bcda7baa JA |
1559 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1560 | { | |
1561 | __io_cqring_fill_event(req, res, 0); | |
1562 | } | |
1563 | ||
7a612350 PB |
1564 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1565 | unsigned int cflags) | |
2b188cc1 | 1566 | { |
78e19bbe | 1567 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1568 | unsigned long flags; |
1569 | ||
1570 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1571 | __io_cqring_fill_event(req, res, cflags); |
c7dae4ba JA |
1572 | /* |
1573 | * If we're the last reference to this request, add to our locked | |
1574 | * free_list cache. | |
1575 | */ | |
de9b4cca | 1576 | if (req_ref_put_and_test(req)) { |
c7dae4ba JA |
1577 | struct io_comp_state *cs = &ctx->submit_state.comp; |
1578 | ||
7a612350 PB |
1579 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
1580 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL_LINK)) | |
1581 | io_disarm_next(req); | |
1582 | if (req->link) { | |
1583 | io_req_task_queue(req->link); | |
1584 | req->link = NULL; | |
1585 | } | |
1586 | } | |
c7dae4ba JA |
1587 | io_dismantle_req(req); |
1588 | io_put_task(req->task, 1); | |
1589 | list_add(&req->compl.list, &cs->locked_free_list); | |
1590 | cs->locked_free_nr++; | |
180f829f PB |
1591 | } else { |
1592 | if (!percpu_ref_tryget(&ctx->refs)) | |
1593 | req = NULL; | |
1594 | } | |
7a612350 | 1595 | io_commit_cqring(ctx); |
2b188cc1 | 1596 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
7a612350 | 1597 | |
180f829f PB |
1598 | if (req) { |
1599 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1600 | percpu_ref_put(&ctx->refs); |
180f829f | 1601 | } |
229a7b63 JA |
1602 | } |
1603 | ||
a38d68db | 1604 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1605 | unsigned int cflags) |
229a7b63 | 1606 | { |
68fb8979 PB |
1607 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
1608 | io_clean_op(req); | |
a38d68db PB |
1609 | req->result = res; |
1610 | req->compl.cflags = cflags; | |
e342c807 | 1611 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1612 | } |
1613 | ||
889fca73 PB |
1614 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1615 | long res, unsigned cflags) | |
bcda7baa | 1616 | { |
889fca73 PB |
1617 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1618 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1619 | else |
c7dae4ba | 1620 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1621 | } |
1622 | ||
a38d68db | 1623 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1624 | { |
889fca73 | 1625 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1626 | } |
1627 | ||
f41db273 PB |
1628 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1629 | { | |
1630 | req_set_fail_links(req); | |
1631 | io_put_req(req); | |
1632 | io_req_complete_post(req, res, 0); | |
1633 | } | |
1634 | ||
dac7a098 PB |
1635 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
1636 | struct io_comp_state *cs) | |
1637 | { | |
1638 | spin_lock_irq(&ctx->completion_lock); | |
1639 | list_splice_init(&cs->locked_free_list, &cs->free_list); | |
1640 | cs->locked_free_nr = 0; | |
1641 | spin_unlock_irq(&ctx->completion_lock); | |
1642 | } | |
1643 | ||
dd78f492 | 1644 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1645 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1646 | { |
c7dae4ba JA |
1647 | struct io_submit_state *state = &ctx->submit_state; |
1648 | struct io_comp_state *cs = &state->comp; | |
dd78f492 | 1649 | int nr; |
0ddf92e8 | 1650 | |
c7dae4ba JA |
1651 | /* |
1652 | * If we have more than a batch's worth of requests in our IRQ side | |
1653 | * locked cache, grab the lock and move them over to our submission | |
1654 | * side cache. | |
1655 | */ | |
dac7a098 PB |
1656 | if (READ_ONCE(cs->locked_free_nr) > IO_COMPL_BATCH) |
1657 | io_flush_cached_locked_reqs(ctx, cs); | |
0ddf92e8 | 1658 | |
dd78f492 | 1659 | nr = state->free_reqs; |
c7dae4ba | 1660 | while (!list_empty(&cs->free_list)) { |
dd78f492 PB |
1661 | struct io_kiocb *req = list_first_entry(&cs->free_list, |
1662 | struct io_kiocb, compl.list); | |
1663 | ||
1b4c351f | 1664 | list_del(&req->compl.list); |
dd78f492 PB |
1665 | state->reqs[nr++] = req; |
1666 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1667 | break; |
1b4c351f JA |
1668 | } |
1669 | ||
dd78f492 PB |
1670 | state->free_reqs = nr; |
1671 | return nr != 0; | |
0ddf92e8 JA |
1672 | } |
1673 | ||
e5d1bc0a | 1674 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
2b188cc1 | 1675 | { |
e5d1bc0a PB |
1676 | struct io_submit_state *state = &ctx->submit_state; |
1677 | ||
1678 | BUILD_BUG_ON(IO_REQ_ALLOC_BATCH > ARRAY_SIZE(state->reqs)); | |
1679 | ||
f6b6c7d6 | 1680 | if (!state->free_reqs) { |
291b2821 | 1681 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1682 | int ret; |
1683 | ||
c7dae4ba | 1684 | if (io_flush_cached_reqs(ctx)) |
e5d1bc0a PB |
1685 | goto got_req; |
1686 | ||
bf019da7 PB |
1687 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1688 | state->reqs); | |
fd6fab2c JA |
1689 | |
1690 | /* | |
1691 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1692 | * retry single alloc to be on the safe side. | |
1693 | */ | |
1694 | if (unlikely(ret <= 0)) { | |
1695 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1696 | if (!state->reqs[0]) | |
3893f39f | 1697 | return NULL; |
fd6fab2c JA |
1698 | ret = 1; |
1699 | } | |
291b2821 | 1700 | state->free_reqs = ret; |
2b188cc1 | 1701 | } |
e5d1bc0a | 1702 | got_req: |
291b2821 PB |
1703 | state->free_reqs--; |
1704 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1705 | } |
1706 | ||
e1d767f0 | 1707 | static inline void io_put_file(struct file *file) |
8da11c19 | 1708 | { |
e1d767f0 | 1709 | if (file) |
8da11c19 PB |
1710 | fput(file); |
1711 | } | |
1712 | ||
4edf20f9 | 1713 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1714 | { |
094bae49 PB |
1715 | unsigned int flags = req->flags; |
1716 | ||
e1d767f0 PB |
1717 | if (!(flags & REQ_F_FIXED_FILE)) |
1718 | io_put_file(req->file); | |
094bae49 PB |
1719 | if (flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1720 | REQ_F_INFLIGHT)) { | |
1721 | io_clean_op(req); | |
1722 | ||
1723 | if (req->flags & REQ_F_INFLIGHT) { | |
1724 | struct io_ring_ctx *ctx = req->ctx; | |
1725 | unsigned long flags; | |
1726 | ||
1727 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1728 | list_del(&req->inflight_entry); | |
1729 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1730 | req->flags &= ~REQ_F_INFLIGHT; | |
1731 | } | |
1732 | } | |
269bbe5f BM |
1733 | if (req->fixed_rsrc_refs) |
1734 | percpu_ref_put(req->fixed_rsrc_refs); | |
094bae49 PB |
1735 | if (req->async_data) |
1736 | kfree(req->async_data); | |
003e8dcc JA |
1737 | if (req->work.creds) { |
1738 | put_cred(req->work.creds); | |
1739 | req->work.creds = NULL; | |
1740 | } | |
e65ef56d JA |
1741 | } |
1742 | ||
b23fcf47 | 1743 | /* must to be called somewhat shortly after putting a request */ |
7c660731 PB |
1744 | static inline void io_put_task(struct task_struct *task, int nr) |
1745 | { | |
1746 | struct io_uring_task *tctx = task->io_uring; | |
1747 | ||
1748 | percpu_counter_sub(&tctx->inflight, nr); | |
1749 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1750 | wake_up(&tctx->wait); | |
1751 | put_task_struct_many(task, nr); | |
1752 | } | |
1753 | ||
216578e5 | 1754 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1755 | { |
51a4cc11 | 1756 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1757 | |
216578e5 | 1758 | io_dismantle_req(req); |
7c660731 | 1759 | io_put_task(req->task, 1); |
c6ca97b3 | 1760 | |
3893f39f | 1761 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 1762 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1763 | } |
1764 | ||
f2f87370 PB |
1765 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1766 | { | |
1767 | struct io_kiocb *nxt = req->link; | |
1768 | ||
1769 | req->link = nxt->link; | |
1770 | nxt->link = NULL; | |
1771 | } | |
1772 | ||
33cc89a9 PB |
1773 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
1774 | __must_hold(&req->ctx->completion_lock) | |
2665abfd | 1775 | { |
33cc89a9 | 1776 | struct io_kiocb *link = req->link; |
f2f87370 | 1777 | |
900fad45 PB |
1778 | /* |
1779 | * Can happen if a linked timeout fired and link had been like | |
1780 | * req -> link t-out -> link t-out [-> ...] | |
1781 | */ | |
c9abd7ad PB |
1782 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1783 | struct io_timeout_data *io = link->async_data; | |
1784 | int ret; | |
7c86ffee | 1785 | |
f2f87370 | 1786 | io_remove_next_linked(req); |
90cd7e42 | 1787 | link->timeout.head = NULL; |
c9abd7ad PB |
1788 | ret = hrtimer_try_to_cancel(&io->timer); |
1789 | if (ret != -1) { | |
1790 | io_cqring_fill_event(link, -ECANCELED); | |
33cc89a9 | 1791 | io_put_req_deferred(link, 1); |
d4729fbd | 1792 | return true; |
c9abd7ad PB |
1793 | } |
1794 | } | |
d4729fbd | 1795 | return false; |
7c86ffee PB |
1796 | } |
1797 | ||
d148ca4b | 1798 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 1799 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 1800 | { |
33cc89a9 | 1801 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 1802 | |
f2f87370 | 1803 | req->link = NULL; |
f2f87370 PB |
1804 | while (link) { |
1805 | nxt = link->link; | |
1806 | link->link = NULL; | |
2665abfd | 1807 | |
f2f87370 | 1808 | trace_io_uring_fail_link(req, link); |
7c86ffee | 1809 | io_cqring_fill_event(link, -ECANCELED); |
1575f21a | 1810 | io_put_req_deferred(link, 2); |
f2f87370 | 1811 | link = nxt; |
9e645e11 | 1812 | } |
33cc89a9 | 1813 | } |
9e645e11 | 1814 | |
33cc89a9 PB |
1815 | static bool io_disarm_next(struct io_kiocb *req) |
1816 | __must_hold(&req->ctx->completion_lock) | |
1817 | { | |
1818 | bool posted = false; | |
1819 | ||
1820 | if (likely(req->flags & REQ_F_LINK_TIMEOUT)) | |
1821 | posted = io_kill_linked_timeout(req); | |
1822 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { | |
1823 | posted |= (req->link != NULL); | |
1824 | io_fail_links(req); | |
1825 | } | |
1826 | return posted; | |
9e645e11 JA |
1827 | } |
1828 | ||
3fa5e0f3 | 1829 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1830 | { |
33cc89a9 | 1831 | struct io_kiocb *nxt; |
944e58bf | 1832 | |
9e645e11 JA |
1833 | /* |
1834 | * If LINK is set, we have dependent requests in this chain. If we | |
1835 | * didn't fail this request, queue the first one up, moving any other | |
1836 | * dependencies to the next request. In case of failure, fail the rest | |
1837 | * of the chain. | |
1838 | */ | |
33cc89a9 PB |
1839 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL_LINK)) { |
1840 | struct io_ring_ctx *ctx = req->ctx; | |
1841 | unsigned long flags; | |
1842 | bool posted; | |
1843 | ||
1844 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1845 | posted = io_disarm_next(req); | |
1846 | if (posted) | |
1847 | io_commit_cqring(req->ctx); | |
1848 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1849 | if (posted) | |
1850 | io_cqring_ev_posted(ctx); | |
f2f87370 | 1851 | } |
33cc89a9 PB |
1852 | nxt = req->link; |
1853 | req->link = NULL; | |
1854 | return nxt; | |
4d7dd462 | 1855 | } |
9e645e11 | 1856 | |
f2f87370 | 1857 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 1858 | { |
cdbff982 | 1859 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
1860 | return NULL; |
1861 | return __io_req_find_next(req); | |
1862 | } | |
1863 | ||
2c32395d PB |
1864 | static void ctx_flush_and_put(struct io_ring_ctx *ctx) |
1865 | { | |
1866 | if (!ctx) | |
1867 | return; | |
1868 | if (ctx->submit_state.comp.nr) { | |
1869 | mutex_lock(&ctx->uring_lock); | |
1870 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
1871 | mutex_unlock(&ctx->uring_lock); | |
1872 | } | |
1873 | percpu_ref_put(&ctx->refs); | |
1874 | } | |
1875 | ||
7cbf1722 | 1876 | static bool __tctx_task_work(struct io_uring_task *tctx) |
c2c4c83c | 1877 | { |
65453d1e | 1878 | struct io_ring_ctx *ctx = NULL; |
7cbf1722 JA |
1879 | struct io_wq_work_list list; |
1880 | struct io_wq_work_node *node; | |
c2c4c83c | 1881 | |
7cbf1722 JA |
1882 | if (wq_list_empty(&tctx->task_list)) |
1883 | return false; | |
6200b0ae | 1884 | |
0b81e80c | 1885 | spin_lock_irq(&tctx->task_lock); |
7cbf1722 JA |
1886 | list = tctx->task_list; |
1887 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 1888 | spin_unlock_irq(&tctx->task_lock); |
c2c4c83c | 1889 | |
7cbf1722 JA |
1890 | node = list.first; |
1891 | while (node) { | |
1892 | struct io_wq_work_node *next = node->next; | |
1893 | struct io_kiocb *req; | |
0ba9c9ed | 1894 | |
7cbf1722 | 1895 | req = container_of(node, struct io_kiocb, io_task_work.node); |
2c32395d PB |
1896 | if (req->ctx != ctx) { |
1897 | ctx_flush_and_put(ctx); | |
1898 | ctx = req->ctx; | |
1899 | percpu_ref_get(&ctx->refs); | |
65453d1e | 1900 | } |
65453d1e | 1901 | |
2c32395d PB |
1902 | req->task_work.func(&req->task_work); |
1903 | node = next; | |
7cbf1722 JA |
1904 | } |
1905 | ||
2c32395d | 1906 | ctx_flush_and_put(ctx); |
7cbf1722 | 1907 | return list.first != NULL; |
c2c4c83c JA |
1908 | } |
1909 | ||
7cbf1722 | 1910 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 1911 | { |
7cbf1722 | 1912 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, task_work); |
c40f6379 | 1913 | |
1d5f360d JA |
1914 | clear_bit(0, &tctx->task_state); |
1915 | ||
7cbf1722 JA |
1916 | while (__tctx_task_work(tctx)) |
1917 | cond_resched(); | |
7cbf1722 JA |
1918 | } |
1919 | ||
c15b79de | 1920 | static int io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 1921 | { |
c15b79de | 1922 | struct task_struct *tsk = req->task; |
7cbf1722 | 1923 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 1924 | enum task_work_notify_mode notify; |
7cbf1722 | 1925 | struct io_wq_work_node *node, *prev; |
0b81e80c | 1926 | unsigned long flags; |
c15b79de PB |
1927 | int ret = 0; |
1928 | ||
1929 | if (unlikely(tsk->flags & PF_EXITING)) | |
1930 | return -ESRCH; | |
7cbf1722 JA |
1931 | |
1932 | WARN_ON_ONCE(!tctx); | |
1933 | ||
0b81e80c | 1934 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 1935 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
0b81e80c | 1936 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
1937 | |
1938 | /* task_work already pending, we're done */ | |
1939 | if (test_bit(0, &tctx->task_state) || | |
1940 | test_and_set_bit(0, &tctx->task_state)) | |
1941 | return 0; | |
1942 | ||
c15b79de PB |
1943 | /* |
1944 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
1945 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
1946 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
1947 | * will do the job. | |
1948 | */ | |
1949 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
1950 | ||
1951 | if (!task_work_add(tsk, &tctx->task_work, notify)) { | |
1952 | wake_up_process(tsk); | |
7cbf1722 | 1953 | return 0; |
c15b79de | 1954 | } |
7cbf1722 JA |
1955 | |
1956 | /* | |
1957 | * Slow path - we failed, find and delete work. if the work is not | |
1958 | * in the list, it got run and we're fine. | |
1959 | */ | |
0b81e80c | 1960 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 JA |
1961 | wq_list_for_each(node, prev, &tctx->task_list) { |
1962 | if (&req->io_task_work.node == node) { | |
1963 | wq_list_del(&tctx->task_list, node, prev); | |
1964 | ret = 1; | |
1965 | break; | |
1966 | } | |
1967 | } | |
0b81e80c | 1968 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
1969 | clear_bit(0, &tctx->task_state); |
1970 | return ret; | |
1971 | } | |
1972 | ||
9b465711 PB |
1973 | static bool io_run_task_work_head(struct callback_head **work_head) |
1974 | { | |
1975 | struct callback_head *work, *next; | |
1976 | bool executed = false; | |
1977 | ||
1978 | do { | |
1979 | work = xchg(work_head, NULL); | |
1980 | if (!work) | |
1981 | break; | |
1982 | ||
1983 | do { | |
1984 | next = work->next; | |
1985 | work->func(work); | |
1986 | work = next; | |
1987 | cond_resched(); | |
1988 | } while (work); | |
1989 | executed = true; | |
1990 | } while (1); | |
1991 | ||
1992 | return executed; | |
1993 | } | |
1994 | ||
1995 | static void io_task_work_add_head(struct callback_head **work_head, | |
1996 | struct callback_head *task_work) | |
eab30c4d | 1997 | { |
7c25c0d1 | 1998 | struct callback_head *head; |
eab30c4d | 1999 | |
7c25c0d1 | 2000 | do { |
9b465711 PB |
2001 | head = READ_ONCE(*work_head); |
2002 | task_work->next = head; | |
2003 | } while (cmpxchg(work_head, head, task_work) != head); | |
2004 | } | |
2005 | ||
2006 | static void io_req_task_work_add_fallback(struct io_kiocb *req, | |
2007 | task_work_func_t cb) | |
2008 | { | |
2009 | init_task_work(&req->task_work, cb); | |
2010 | io_task_work_add_head(&req->ctx->exit_task_work, &req->task_work); | |
eab30c4d PB |
2011 | } |
2012 | ||
c40f6379 JA |
2013 | static void io_req_task_cancel(struct callback_head *cb) |
2014 | { | |
2015 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2016 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2017 | |
e83acd7d | 2018 | /* ctx is guaranteed to stay alive while we hold uring_lock */ |
792bb6eb | 2019 | mutex_lock(&ctx->uring_lock); |
2593553a | 2020 | io_req_complete_failed(req, req->result); |
792bb6eb | 2021 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2022 | } |
2023 | ||
2024 | static void __io_req_task_submit(struct io_kiocb *req) | |
2025 | { | |
2026 | struct io_ring_ctx *ctx = req->ctx; | |
2027 | ||
04fc6c80 | 2028 | /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ |
81b6d05c | 2029 | mutex_lock(&ctx->uring_lock); |
70aacfe6 | 2030 | if (!(current->flags & PF_EXITING) && !current->in_execve) |
c5eef2b9 | 2031 | __io_queue_sqe(req); |
81b6d05c | 2032 | else |
2593553a | 2033 | io_req_complete_failed(req, -EFAULT); |
81b6d05c | 2034 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2035 | } |
2036 | ||
2037 | static void io_req_task_submit(struct callback_head *cb) | |
2038 | { | |
2039 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2040 | ||
2041 | __io_req_task_submit(req); | |
2042 | } | |
2043 | ||
2c4b8eb6 | 2044 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2045 | { |
2c4b8eb6 PB |
2046 | req->result = ret; |
2047 | req->task_work.func = io_req_task_cancel; | |
c40f6379 | 2048 | |
2c4b8eb6 | 2049 | if (unlikely(io_req_task_work_add(req))) |
eab30c4d | 2050 | io_req_task_work_add_fallback(req, io_req_task_cancel); |
c40f6379 JA |
2051 | } |
2052 | ||
2c4b8eb6 | 2053 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2054 | { |
2c4b8eb6 | 2055 | req->task_work.func = io_req_task_submit; |
a3df7698 PB |
2056 | |
2057 | if (unlikely(io_req_task_work_add(req))) | |
2c4b8eb6 | 2058 | io_req_task_queue_fail(req, -ECANCELED); |
a3df7698 PB |
2059 | } |
2060 | ||
f2f87370 | 2061 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2062 | { |
9b5f7bd9 | 2063 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2064 | |
2065 | if (nxt) | |
906a8c3f | 2066 | io_req_task_queue(nxt); |
c69f8dbe JL |
2067 | } |
2068 | ||
c3524383 | 2069 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2070 | { |
c3524383 PB |
2071 | io_queue_next(req); |
2072 | __io_free_req(req); | |
2073 | } | |
8766dd51 | 2074 | |
2d6500d4 | 2075 | struct req_batch { |
5af1d13e PB |
2076 | struct task_struct *task; |
2077 | int task_refs; | |
1b4c351f | 2078 | int ctx_refs; |
2d6500d4 PB |
2079 | }; |
2080 | ||
5af1d13e PB |
2081 | static inline void io_init_req_batch(struct req_batch *rb) |
2082 | { | |
5af1d13e | 2083 | rb->task_refs = 0; |
9ae72463 | 2084 | rb->ctx_refs = 0; |
5af1d13e PB |
2085 | rb->task = NULL; |
2086 | } | |
2087 | ||
2d6500d4 PB |
2088 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2089 | struct req_batch *rb) | |
2090 | { | |
6e833d53 | 2091 | if (rb->task) |
7c660731 | 2092 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2093 | if (rb->ctx_refs) |
2094 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2095 | } |
2096 | ||
6ff119a6 PB |
2097 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2098 | struct io_submit_state *state) | |
2d6500d4 | 2099 | { |
f2f87370 | 2100 | io_queue_next(req); |
96670657 | 2101 | io_dismantle_req(req); |
2d6500d4 | 2102 | |
e3bc8e9d | 2103 | if (req->task != rb->task) { |
7c660731 PB |
2104 | if (rb->task) |
2105 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2106 | rb->task = req->task; |
2107 | rb->task_refs = 0; | |
5af1d13e | 2108 | } |
e3bc8e9d | 2109 | rb->task_refs++; |
9ae72463 | 2110 | rb->ctx_refs++; |
5af1d13e | 2111 | |
bd759045 | 2112 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2113 | state->reqs[state->free_reqs++] = req; |
bd759045 PB |
2114 | else |
2115 | list_add(&req->compl.list, &state->comp.free_list); | |
7a743e22 PB |
2116 | } |
2117 | ||
905c172f PB |
2118 | static void io_submit_flush_completions(struct io_comp_state *cs, |
2119 | struct io_ring_ctx *ctx) | |
2120 | { | |
2121 | int i, nr = cs->nr; | |
2122 | struct io_kiocb *req; | |
2123 | struct req_batch rb; | |
2124 | ||
2125 | io_init_req_batch(&rb); | |
2126 | spin_lock_irq(&ctx->completion_lock); | |
2127 | for (i = 0; i < nr; i++) { | |
2128 | req = cs->reqs[i]; | |
2129 | __io_cqring_fill_event(req, req->result, req->compl.cflags); | |
2130 | } | |
2131 | io_commit_cqring(ctx); | |
2132 | spin_unlock_irq(&ctx->completion_lock); | |
2133 | ||
2134 | io_cqring_ev_posted(ctx); | |
2135 | for (i = 0; i < nr; i++) { | |
2136 | req = cs->reqs[i]; | |
2137 | ||
2138 | /* submission and completion refs */ | |
de9b4cca | 2139 | if (req_ref_sub_and_test(req, 2)) |
6ff119a6 | 2140 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2141 | } |
2142 | ||
2143 | io_req_free_batch_finish(ctx, &rb); | |
2144 | cs->nr = 0; | |
7a743e22 PB |
2145 | } |
2146 | ||
ba816ad6 JA |
2147 | /* |
2148 | * Drop reference to request, return next in chain (if there is one) if this | |
2149 | * was the last reference to this request. | |
2150 | */ | |
0d85035a | 2151 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2152 | { |
9b5f7bd9 PB |
2153 | struct io_kiocb *nxt = NULL; |
2154 | ||
de9b4cca | 2155 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2156 | nxt = io_req_find_next(req); |
4d7dd462 | 2157 | __io_free_req(req); |
2a44f467 | 2158 | } |
9b5f7bd9 | 2159 | return nxt; |
2b188cc1 JA |
2160 | } |
2161 | ||
0d85035a | 2162 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2163 | { |
de9b4cca | 2164 | if (req_ref_put_and_test(req)) |
e65ef56d | 2165 | io_free_req(req); |
2b188cc1 JA |
2166 | } |
2167 | ||
216578e5 PB |
2168 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2169 | { | |
2170 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2171 | ||
2172 | io_free_req(req); | |
2173 | } | |
2174 | ||
2175 | static void io_free_req_deferred(struct io_kiocb *req) | |
2176 | { | |
7cbf1722 | 2177 | req->task_work.func = io_put_req_deferred_cb; |
a05432fb | 2178 | if (unlikely(io_req_task_work_add(req))) |
eab30c4d | 2179 | io_req_task_work_add_fallback(req, io_put_req_deferred_cb); |
216578e5 PB |
2180 | } |
2181 | ||
2182 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2183 | { | |
de9b4cca | 2184 | if (req_ref_sub_and_test(req, refs)) |
216578e5 PB |
2185 | io_free_req_deferred(req); |
2186 | } | |
2187 | ||
6c503150 | 2188 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2189 | { |
2190 | /* See comment at the top of this file */ | |
2191 | smp_rmb(); | |
e23de15f | 2192 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2193 | } |
2194 | ||
fb5ccc98 PB |
2195 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2196 | { | |
2197 | struct io_rings *rings = ctx->rings; | |
2198 | ||
2199 | /* make sure SQ entry isn't read before tail */ | |
2200 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2201 | } | |
2202 | ||
8ff069bf | 2203 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2204 | { |
8ff069bf | 2205 | unsigned int cflags; |
e94f141b | 2206 | |
bcda7baa JA |
2207 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2208 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2209 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2210 | kfree(kbuf); |
2211 | return cflags; | |
e94f141b JA |
2212 | } |
2213 | ||
8ff069bf | 2214 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2215 | { |
4d954c25 | 2216 | struct io_buffer *kbuf; |
bcda7baa | 2217 | |
4d954c25 | 2218 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2219 | return io_put_kbuf(req, kbuf); |
2220 | } | |
2221 | ||
4c6e277c JA |
2222 | static inline bool io_run_task_work(void) |
2223 | { | |
6200b0ae JA |
2224 | /* |
2225 | * Not safe to run on exiting task, and the task_work handling will | |
2226 | * not add work to such a task. | |
2227 | */ | |
2228 | if (unlikely(current->flags & PF_EXITING)) | |
2229 | return false; | |
4c6e277c JA |
2230 | if (current->task_works) { |
2231 | __set_current_state(TASK_RUNNING); | |
2232 | task_work_run(); | |
2233 | return true; | |
2234 | } | |
2235 | ||
2236 | return false; | |
bcda7baa JA |
2237 | } |
2238 | ||
def596e9 JA |
2239 | /* |
2240 | * Find and free completed poll iocbs | |
2241 | */ | |
2242 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2243 | struct list_head *done) | |
2244 | { | |
8237e045 | 2245 | struct req_batch rb; |
def596e9 | 2246 | struct io_kiocb *req; |
bbde017a XW |
2247 | |
2248 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2249 | smp_rmb(); | |
def596e9 | 2250 | |
5af1d13e | 2251 | io_init_req_batch(&rb); |
def596e9 | 2252 | while (!list_empty(done)) { |
bcda7baa JA |
2253 | int cflags = 0; |
2254 | ||
d21ffe7e | 2255 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2256 | list_del(&req->inflight_entry); |
2257 | ||
8c130827 PB |
2258 | if (READ_ONCE(req->result) == -EAGAIN && |
2259 | !(req->flags & REQ_F_DONT_REISSUE)) { | |
bbde017a | 2260 | req->iopoll_completed = 0; |
8c130827 PB |
2261 | req_ref_get(req); |
2262 | io_queue_async_work(req); | |
2263 | continue; | |
bbde017a | 2264 | } |
def596e9 | 2265 | |
bcda7baa | 2266 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2267 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2268 | |
2269 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2270 | (*nr_events)++; |
2271 | ||
de9b4cca | 2272 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2273 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2274 | } |
def596e9 | 2275 | |
09bb8394 | 2276 | io_commit_cqring(ctx); |
80c18e4a | 2277 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2278 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2279 | } |
2280 | ||
def596e9 JA |
2281 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2282 | long min) | |
2283 | { | |
2284 | struct io_kiocb *req, *tmp; | |
2285 | LIST_HEAD(done); | |
2286 | bool spin; | |
2287 | int ret; | |
2288 | ||
2289 | /* | |
2290 | * Only spin for completions if we don't have multiple devices hanging | |
2291 | * off our complete list, and we're under the requested amount. | |
2292 | */ | |
2293 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2294 | ||
2295 | ret = 0; | |
d21ffe7e | 2296 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2297 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2298 | |
2299 | /* | |
581f9810 BM |
2300 | * Move completed and retryable entries to our local lists. |
2301 | * If we find a request that requires polling, break out | |
2302 | * and complete those lists first, if we have entries there. | |
def596e9 | 2303 | */ |
65a6543d | 2304 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2305 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2306 | continue; |
2307 | } | |
2308 | if (!list_empty(&done)) | |
2309 | break; | |
2310 | ||
2311 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2312 | if (ret < 0) | |
2313 | break; | |
2314 | ||
3aadc23e PB |
2315 | /* iopoll may have completed current req */ |
2316 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2317 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2318 | |
def596e9 JA |
2319 | if (ret && spin) |
2320 | spin = false; | |
2321 | ret = 0; | |
2322 | } | |
2323 | ||
2324 | if (!list_empty(&done)) | |
2325 | io_iopoll_complete(ctx, nr_events, &done); | |
2326 | ||
2327 | return ret; | |
2328 | } | |
2329 | ||
2330 | /* | |
d195a66e | 2331 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2332 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2333 | * as a non-spinning completion check. | |
2334 | */ | |
2335 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2336 | long min) | |
2337 | { | |
540e32a0 | 2338 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2339 | int ret; |
2340 | ||
2341 | ret = io_do_iopoll(ctx, nr_events, min); | |
2342 | if (ret < 0) | |
2343 | return ret; | |
eba0a4dd | 2344 | if (*nr_events >= min) |
def596e9 JA |
2345 | return 0; |
2346 | } | |
2347 | ||
2348 | return 1; | |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * We can't just wait for polled events to come to us, we have to actively | |
2353 | * find and complete them. | |
2354 | */ | |
b2edc0a7 | 2355 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2356 | { |
2357 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2358 | return; | |
2359 | ||
2360 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2361 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2362 | unsigned int nr_events = 0; |
2363 | ||
b2edc0a7 | 2364 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2365 | |
b2edc0a7 PB |
2366 | /* let it sleep and repeat later if can't complete a request */ |
2367 | if (nr_events == 0) | |
2368 | break; | |
08f5439f JA |
2369 | /* |
2370 | * Ensure we allow local-to-the-cpu processing to take place, | |
2371 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2372 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2373 | */ |
3fcee5a6 PB |
2374 | if (need_resched()) { |
2375 | mutex_unlock(&ctx->uring_lock); | |
2376 | cond_resched(); | |
2377 | mutex_lock(&ctx->uring_lock); | |
2378 | } | |
def596e9 JA |
2379 | } |
2380 | mutex_unlock(&ctx->uring_lock); | |
2381 | } | |
2382 | ||
7668b92a | 2383 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2384 | { |
7668b92a | 2385 | unsigned int nr_events = 0; |
2b2ed975 | 2386 | int iters = 0, ret = 0; |
500f9fba | 2387 | |
c7849be9 XW |
2388 | /* |
2389 | * We disallow the app entering submit/complete with polling, but we | |
2390 | * still need to lock the ring to prevent racing with polled issue | |
2391 | * that got punted to a workqueue. | |
2392 | */ | |
2393 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2394 | do { |
a3a0e43f JA |
2395 | /* |
2396 | * Don't enter poll loop if we already have events pending. | |
2397 | * If we do, we can potentially be spinning for commands that | |
2398 | * already triggered a CQE (eg in error). | |
2399 | */ | |
6c503150 PB |
2400 | if (test_bit(0, &ctx->cq_check_overflow)) |
2401 | __io_cqring_overflow_flush(ctx, false, NULL, NULL); | |
2402 | if (io_cqring_events(ctx)) | |
a3a0e43f JA |
2403 | break; |
2404 | ||
500f9fba JA |
2405 | /* |
2406 | * If a submit got punted to a workqueue, we can have the | |
2407 | * application entering polling for a command before it gets | |
2408 | * issued. That app will hold the uring_lock for the duration | |
2409 | * of the poll right here, so we need to take a breather every | |
2410 | * now and then to ensure that the issue has a chance to add | |
2411 | * the poll to the issued list. Otherwise we can spin here | |
2412 | * forever, while the workqueue is stuck trying to acquire the | |
2413 | * very same mutex. | |
2414 | */ | |
2415 | if (!(++iters & 7)) { | |
2416 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2417 | io_run_task_work(); |
500f9fba JA |
2418 | mutex_lock(&ctx->uring_lock); |
2419 | } | |
2420 | ||
7668b92a | 2421 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2422 | if (ret <= 0) |
2423 | break; | |
2424 | ret = 0; | |
7668b92a | 2425 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2426 | |
500f9fba | 2427 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2428 | return ret; |
2429 | } | |
2430 | ||
491381ce | 2431 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2432 | { |
491381ce JA |
2433 | /* |
2434 | * Tell lockdep we inherited freeze protection from submission | |
2435 | * thread. | |
2436 | */ | |
2437 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2438 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2439 | |
1c98679d PB |
2440 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2441 | sb_end_write(sb); | |
2b188cc1 JA |
2442 | } |
2443 | } | |
2444 | ||
b63534c4 | 2445 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2446 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2447 | { |
ab454438 PB |
2448 | struct io_async_rw *rw = req->async_data; |
2449 | ||
2450 | if (!rw) | |
2451 | return !io_req_prep_async(req); | |
2452 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2453 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2454 | return true; | |
b63534c4 | 2455 | } |
b63534c4 | 2456 | |
3e6a0d3c | 2457 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2458 | { |
355afaeb | 2459 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2460 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2461 | |
355afaeb JA |
2462 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2463 | return false; | |
3e6a0d3c JA |
2464 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2465 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2466 | return false; |
7c977a58 JA |
2467 | /* |
2468 | * If ref is dying, we might be running poll reap from the exit work. | |
2469 | * Don't attempt to reissue from that path, just let it fail with | |
2470 | * -EAGAIN. | |
2471 | */ | |
3e6a0d3c JA |
2472 | if (percpu_ref_is_dying(&ctx->refs)) |
2473 | return false; | |
2474 | return true; | |
2475 | } | |
e82ad485 JA |
2476 | #else |
2477 | static bool io_rw_should_reissue(struct io_kiocb *req) | |
2478 | { | |
2479 | return false; | |
2480 | } | |
3e6a0d3c JA |
2481 | #endif |
2482 | ||
a1d7c393 | 2483 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2484 | unsigned int issue_flags) |
a1d7c393 | 2485 | { |
2f8e45f1 PB |
2486 | int cflags = 0; |
2487 | ||
b65c128f PB |
2488 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2489 | kiocb_end_write(req); | |
9532b99b PB |
2490 | if (res != req->result) { |
2491 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2492 | io_rw_should_reissue(req)) { | |
2493 | req->flags |= REQ_F_REISSUE; | |
2494 | return; | |
2495 | } | |
2f8e45f1 | 2496 | req_set_fail_links(req); |
9532b99b | 2497 | } |
2f8e45f1 PB |
2498 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2499 | cflags = io_put_rw_kbuf(req); | |
2500 | __io_req_complete(req, issue_flags, res, cflags); | |
ba816ad6 JA |
2501 | } |
2502 | ||
2503 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2504 | { | |
9adbd45d | 2505 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2506 | |
889fca73 | 2507 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2508 | } |
2509 | ||
def596e9 JA |
2510 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2511 | { | |
9adbd45d | 2512 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2513 | |
491381ce JA |
2514 | if (kiocb->ki_flags & IOCB_WRITE) |
2515 | kiocb_end_write(req); | |
9532b99b PB |
2516 | if (unlikely(res != req->result)) { |
2517 | bool fail = true; | |
def596e9 | 2518 | |
9532b99b PB |
2519 | #ifdef CONFIG_BLOCK |
2520 | if (res == -EAGAIN && io_rw_should_reissue(req) && | |
2521 | io_resubmit_prep(req)) | |
2522 | fail = false; | |
2523 | #endif | |
2524 | if (fail) { | |
2525 | req_set_fail_links(req); | |
2526 | req->flags |= REQ_F_DONT_REISSUE; | |
2527 | } | |
8c130827 | 2528 | } |
bbde017a XW |
2529 | |
2530 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2531 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2532 | smp_wmb(); |
2533 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2534 | } |
2535 | ||
2536 | /* | |
2537 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2538 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2539 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2540 | * accessing the kiocb cookie. | |
2541 | */ | |
2e9dbe90 | 2542 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2543 | { |
2544 | struct io_ring_ctx *ctx = req->ctx; | |
2545 | ||
2546 | /* | |
2547 | * Track whether we have multiple files in our lists. This will impact | |
2548 | * how we do polling eventually, not spinning if we're on potentially | |
2549 | * different devices. | |
2550 | */ | |
540e32a0 | 2551 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2552 | ctx->poll_multi_file = false; |
2553 | } else if (!ctx->poll_multi_file) { | |
2554 | struct io_kiocb *list_req; | |
2555 | ||
540e32a0 | 2556 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2557 | inflight_entry); |
9adbd45d | 2558 | if (list_req->file != req->file) |
def596e9 JA |
2559 | ctx->poll_multi_file = true; |
2560 | } | |
2561 | ||
2562 | /* | |
2563 | * For fast devices, IO may have already completed. If it has, add | |
2564 | * it to the front so we find it first. | |
2565 | */ | |
65a6543d | 2566 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2567 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2568 | else |
d21ffe7e | 2569 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2570 | |
2e9dbe90 XW |
2571 | /* |
2572 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2573 | * task context or in io worker task context. If current task context is | |
2574 | * sq thread, we don't need to check whether should wake up sq thread. | |
2575 | */ | |
2576 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2577 | wq_has_sleeper(&ctx->sq_data->wait)) |
2578 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2579 | } |
2580 | ||
9f13c35b PB |
2581 | static inline void io_state_file_put(struct io_submit_state *state) |
2582 | { | |
02b23a9a PB |
2583 | if (state->file_refs) { |
2584 | fput_many(state->file, state->file_refs); | |
2585 | state->file_refs = 0; | |
2586 | } | |
9a56a232 JA |
2587 | } |
2588 | ||
2589 | /* | |
2590 | * Get as many references to a file as we have IOs left in this submission, | |
2591 | * assuming most submissions are for one file, or at least that each file | |
2592 | * has more than one submission. | |
2593 | */ | |
8da11c19 | 2594 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2595 | { |
2596 | if (!state) | |
2597 | return fget(fd); | |
2598 | ||
6e1271e6 | 2599 | if (state->file_refs) { |
9a56a232 | 2600 | if (state->fd == fd) { |
6e1271e6 | 2601 | state->file_refs--; |
9a56a232 JA |
2602 | return state->file; |
2603 | } | |
02b23a9a | 2604 | io_state_file_put(state); |
9a56a232 JA |
2605 | } |
2606 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2607 | if (unlikely(!state->file)) |
9a56a232 JA |
2608 | return NULL; |
2609 | ||
2610 | state->fd = fd; | |
6e1271e6 | 2611 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2612 | return state->file; |
2613 | } | |
2614 | ||
4503b767 JA |
2615 | static bool io_bdev_nowait(struct block_device *bdev) |
2616 | { | |
9ba0d0c8 | 2617 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2618 | } |
2619 | ||
2b188cc1 JA |
2620 | /* |
2621 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2622 | * any file. For now, just ensure that anything potentially problematic is done | |
2623 | * inline. | |
2624 | */ | |
7b29f92d | 2625 | static bool __io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2626 | { |
2627 | umode_t mode = file_inode(file)->i_mode; | |
2628 | ||
4503b767 | 2629 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2630 | if (IS_ENABLED(CONFIG_BLOCK) && |
2631 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2632 | return true; |
2633 | return false; | |
2634 | } | |
2635 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2636 | return true; |
4503b767 | 2637 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2638 | if (IS_ENABLED(CONFIG_BLOCK) && |
2639 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2640 | file->f_op != &io_uring_fops) |
2641 | return true; | |
2642 | return false; | |
2643 | } | |
2b188cc1 | 2644 | |
c5b85625 JA |
2645 | /* any ->read/write should understand O_NONBLOCK */ |
2646 | if (file->f_flags & O_NONBLOCK) | |
2647 | return true; | |
2648 | ||
af197f50 JA |
2649 | if (!(file->f_mode & FMODE_NOWAIT)) |
2650 | return false; | |
2651 | ||
2652 | if (rw == READ) | |
2653 | return file->f_op->read_iter != NULL; | |
2654 | ||
2655 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2656 | } |
2657 | ||
7b29f92d JA |
2658 | static bool io_file_supports_async(struct io_kiocb *req, int rw) |
2659 | { | |
2660 | if (rw == READ && (req->flags & REQ_F_ASYNC_READ)) | |
2661 | return true; | |
2662 | else if (rw == WRITE && (req->flags & REQ_F_ASYNC_WRITE)) | |
2663 | return true; | |
2664 | ||
2665 | return __io_file_supports_async(req->file, rw); | |
2666 | } | |
2667 | ||
a88fc400 | 2668 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2669 | { |
def596e9 | 2670 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2671 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2672 | struct file *file = req->file; |
09bb8394 JA |
2673 | unsigned ioprio; |
2674 | int ret; | |
2b188cc1 | 2675 | |
7b29f92d | 2676 | if (!(req->flags & REQ_F_ISREG) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2677 | req->flags |= REQ_F_ISREG; |
2678 | ||
2b188cc1 | 2679 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2680 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2681 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2682 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2683 | } |
2b188cc1 | 2684 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2685 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2686 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2687 | if (unlikely(ret)) | |
2688 | return ret; | |
2b188cc1 | 2689 | |
75c668cd PB |
2690 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2691 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2692 | req->flags |= REQ_F_NOWAIT; | |
2693 | ||
2b188cc1 JA |
2694 | ioprio = READ_ONCE(sqe->ioprio); |
2695 | if (ioprio) { | |
2696 | ret = ioprio_check_cap(ioprio); | |
2697 | if (ret) | |
09bb8394 | 2698 | return ret; |
2b188cc1 JA |
2699 | |
2700 | kiocb->ki_ioprio = ioprio; | |
2701 | } else | |
2702 | kiocb->ki_ioprio = get_current_ioprio(); | |
2703 | ||
def596e9 | 2704 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2705 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2706 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2707 | return -EOPNOTSUPP; |
2b188cc1 | 2708 | |
def596e9 JA |
2709 | kiocb->ki_flags |= IOCB_HIPRI; |
2710 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2711 | req->iopoll_completed = 0; |
def596e9 | 2712 | } else { |
09bb8394 JA |
2713 | if (kiocb->ki_flags & IOCB_HIPRI) |
2714 | return -EINVAL; | |
def596e9 JA |
2715 | kiocb->ki_complete = io_complete_rw; |
2716 | } | |
9adbd45d | 2717 | |
3529d8c2 JA |
2718 | req->rw.addr = READ_ONCE(sqe->addr); |
2719 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2720 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2721 | return 0; |
2b188cc1 JA |
2722 | } |
2723 | ||
2724 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2725 | { | |
2726 | switch (ret) { | |
2727 | case -EIOCBQUEUED: | |
2728 | break; | |
2729 | case -ERESTARTSYS: | |
2730 | case -ERESTARTNOINTR: | |
2731 | case -ERESTARTNOHAND: | |
2732 | case -ERESTART_RESTARTBLOCK: | |
2733 | /* | |
2734 | * We can't just restart the syscall, since previously | |
2735 | * submitted sqes may already be in progress. Just fail this | |
2736 | * IO with EINTR. | |
2737 | */ | |
2738 | ret = -EINTR; | |
df561f66 | 2739 | fallthrough; |
2b188cc1 JA |
2740 | default: |
2741 | kiocb->ki_complete(kiocb, ret, 0); | |
2742 | } | |
2743 | } | |
2744 | ||
a1d7c393 | 2745 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2746 | unsigned int issue_flags) |
ba816ad6 | 2747 | { |
ba04291e | 2748 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2749 | struct io_async_rw *io = req->async_data; |
97284637 | 2750 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2751 | |
227c0c96 | 2752 | /* add previously done IO, if any */ |
e8c2bc1f | 2753 | if (io && io->bytes_done > 0) { |
227c0c96 | 2754 | if (ret < 0) |
e8c2bc1f | 2755 | ret = io->bytes_done; |
227c0c96 | 2756 | else |
e8c2bc1f | 2757 | ret += io->bytes_done; |
227c0c96 JA |
2758 | } |
2759 | ||
ba04291e JA |
2760 | if (req->flags & REQ_F_CUR_POS) |
2761 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2762 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
889fca73 | 2763 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2764 | else |
2765 | io_rw_done(kiocb, ret); | |
97284637 PB |
2766 | |
2767 | if (check_reissue && req->flags & REQ_F_REISSUE) { | |
2768 | req->flags &= ~REQ_F_REISSUE; | |
8c130827 PB |
2769 | if (!io_resubmit_prep(req)) { |
2770 | req_ref_get(req); | |
2771 | io_queue_async_work(req); | |
2772 | } else { | |
97284637 PB |
2773 | int cflags = 0; |
2774 | ||
2775 | req_set_fail_links(req); | |
2776 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2777 | cflags = io_put_rw_kbuf(req); | |
2778 | __io_req_complete(req, issue_flags, ret, cflags); | |
2779 | } | |
2780 | } | |
ba816ad6 JA |
2781 | } |
2782 | ||
847595de | 2783 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
edafccee | 2784 | { |
9adbd45d JA |
2785 | struct io_ring_ctx *ctx = req->ctx; |
2786 | size_t len = req->rw.len; | |
edafccee | 2787 | struct io_mapped_ubuf *imu; |
4be1c615 | 2788 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2789 | size_t offset; |
2790 | u64 buf_addr; | |
2791 | ||
edafccee JA |
2792 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2793 | return -EFAULT; | |
edafccee JA |
2794 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2795 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2796 | buf_addr = req->rw.addr; |
edafccee JA |
2797 | |
2798 | /* overflow */ | |
2799 | if (buf_addr + len < buf_addr) | |
2800 | return -EFAULT; | |
2801 | /* not inside the mapped region */ | |
2802 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2803 | return -EFAULT; | |
2804 | ||
2805 | /* | |
2806 | * May not be a start of buffer, set size appropriately | |
2807 | * and advance us to the beginning. | |
2808 | */ | |
2809 | offset = buf_addr - imu->ubuf; | |
2810 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2811 | |
2812 | if (offset) { | |
2813 | /* | |
2814 | * Don't use iov_iter_advance() here, as it's really slow for | |
2815 | * using the latter parts of a big fixed buffer - it iterates | |
2816 | * over each segment manually. We can cheat a bit here, because | |
2817 | * we know that: | |
2818 | * | |
2819 | * 1) it's a BVEC iter, we set it up | |
2820 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2821 | * first and last bvec | |
2822 | * | |
2823 | * So just find our index, and adjust the iterator afterwards. | |
2824 | * If the offset is within the first bvec (or the whole first | |
2825 | * bvec, just use iov_iter_advance(). This makes it easier | |
2826 | * since we can just skip the first segment, which may not | |
2827 | * be PAGE_SIZE aligned. | |
2828 | */ | |
2829 | const struct bio_vec *bvec = imu->bvec; | |
2830 | ||
2831 | if (offset <= bvec->bv_len) { | |
2832 | iov_iter_advance(iter, offset); | |
2833 | } else { | |
2834 | unsigned long seg_skip; | |
2835 | ||
2836 | /* skip first vec */ | |
2837 | offset -= bvec->bv_len; | |
2838 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2839 | ||
2840 | iter->bvec = bvec + seg_skip; | |
2841 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2842 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2843 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2844 | } |
2845 | } | |
2846 | ||
847595de | 2847 | return 0; |
edafccee JA |
2848 | } |
2849 | ||
bcda7baa JA |
2850 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2851 | { | |
2852 | if (needs_lock) | |
2853 | mutex_unlock(&ctx->uring_lock); | |
2854 | } | |
2855 | ||
2856 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2857 | { | |
2858 | /* | |
2859 | * "Normal" inline submissions always hold the uring_lock, since we | |
2860 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2861 | * The only exception is when we've detached the request and issue it | |
2862 | * from an async worker thread, grab the lock for that case. | |
2863 | */ | |
2864 | if (needs_lock) | |
2865 | mutex_lock(&ctx->uring_lock); | |
2866 | } | |
2867 | ||
2868 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2869 | int bgid, struct io_buffer *kbuf, | |
2870 | bool needs_lock) | |
2871 | { | |
2872 | struct io_buffer *head; | |
2873 | ||
2874 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2875 | return kbuf; | |
2876 | ||
2877 | io_ring_submit_lock(req->ctx, needs_lock); | |
2878 | ||
2879 | lockdep_assert_held(&req->ctx->uring_lock); | |
2880 | ||
9e15c3a0 | 2881 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2882 | if (head) { |
2883 | if (!list_empty(&head->list)) { | |
2884 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2885 | list); | |
2886 | list_del(&kbuf->list); | |
2887 | } else { | |
2888 | kbuf = head; | |
9e15c3a0 | 2889 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2890 | } |
2891 | if (*len > kbuf->len) | |
2892 | *len = kbuf->len; | |
2893 | } else { | |
2894 | kbuf = ERR_PTR(-ENOBUFS); | |
2895 | } | |
2896 | ||
2897 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2898 | ||
2899 | return kbuf; | |
2900 | } | |
2901 | ||
4d954c25 JA |
2902 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2903 | bool needs_lock) | |
2904 | { | |
2905 | struct io_buffer *kbuf; | |
4f4eeba8 | 2906 | u16 bgid; |
4d954c25 JA |
2907 | |
2908 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2909 | bgid = req->buf_index; |
4d954c25 JA |
2910 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2911 | if (IS_ERR(kbuf)) | |
2912 | return kbuf; | |
2913 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2914 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2915 | return u64_to_user_ptr(kbuf->addr); | |
2916 | } | |
2917 | ||
2918 | #ifdef CONFIG_COMPAT | |
2919 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2920 | bool needs_lock) | |
2921 | { | |
2922 | struct compat_iovec __user *uiov; | |
2923 | compat_ssize_t clen; | |
2924 | void __user *buf; | |
2925 | ssize_t len; | |
2926 | ||
2927 | uiov = u64_to_user_ptr(req->rw.addr); | |
2928 | if (!access_ok(uiov, sizeof(*uiov))) | |
2929 | return -EFAULT; | |
2930 | if (__get_user(clen, &uiov->iov_len)) | |
2931 | return -EFAULT; | |
2932 | if (clen < 0) | |
2933 | return -EINVAL; | |
2934 | ||
2935 | len = clen; | |
2936 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2937 | if (IS_ERR(buf)) | |
2938 | return PTR_ERR(buf); | |
2939 | iov[0].iov_base = buf; | |
2940 | iov[0].iov_len = (compat_size_t) len; | |
2941 | return 0; | |
2942 | } | |
2943 | #endif | |
2944 | ||
2945 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2946 | bool needs_lock) | |
2947 | { | |
2948 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2949 | void __user *buf; | |
2950 | ssize_t len; | |
2951 | ||
2952 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2953 | return -EFAULT; | |
2954 | ||
2955 | len = iov[0].iov_len; | |
2956 | if (len < 0) | |
2957 | return -EINVAL; | |
2958 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2959 | if (IS_ERR(buf)) | |
2960 | return PTR_ERR(buf); | |
2961 | iov[0].iov_base = buf; | |
2962 | iov[0].iov_len = len; | |
2963 | return 0; | |
2964 | } | |
2965 | ||
2966 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2967 | bool needs_lock) | |
2968 | { | |
dddb3e26 JA |
2969 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2970 | struct io_buffer *kbuf; | |
2971 | ||
2972 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2973 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2974 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2975 | return 0; |
dddb3e26 | 2976 | } |
dd201662 | 2977 | if (req->rw.len != 1) |
4d954c25 JA |
2978 | return -EINVAL; |
2979 | ||
2980 | #ifdef CONFIG_COMPAT | |
2981 | if (req->ctx->compat) | |
2982 | return io_compat_import(req, iov, needs_lock); | |
2983 | #endif | |
2984 | ||
2985 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2986 | } | |
2987 | ||
847595de PB |
2988 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
2989 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 2990 | { |
9adbd45d JA |
2991 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2992 | size_t sqe_len = req->rw.len; | |
847595de | 2993 | u8 opcode = req->opcode; |
4d954c25 | 2994 | ssize_t ret; |
edafccee | 2995 | |
7d009165 | 2996 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2997 | *iovec = NULL; |
9adbd45d | 2998 | return io_import_fixed(req, rw, iter); |
edafccee | 2999 | } |
2b188cc1 | 3000 | |
bcda7baa | 3001 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3002 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3003 | return -EINVAL; |
3004 | ||
3a6820f2 | 3005 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3006 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3007 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3008 | if (IS_ERR(buf)) |
4d954c25 | 3009 | return PTR_ERR(buf); |
3f9d6441 | 3010 | req->rw.len = sqe_len; |
bcda7baa JA |
3011 | } |
3012 | ||
3a6820f2 JA |
3013 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3014 | *iovec = NULL; | |
10fc72e4 | 3015 | return ret; |
3a6820f2 JA |
3016 | } |
3017 | ||
4d954c25 JA |
3018 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3019 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3020 | if (!ret) |
3021 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3022 | *iovec = NULL; |
3023 | return ret; | |
3024 | } | |
3025 | ||
89cd35c5 CH |
3026 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3027 | req->ctx->compat); | |
2b188cc1 JA |
3028 | } |
3029 | ||
0fef9483 JA |
3030 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3031 | { | |
5b09e37e | 3032 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3033 | } |
3034 | ||
31b51510 | 3035 | /* |
32960613 JA |
3036 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3037 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3038 | */ |
4017eb91 | 3039 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3040 | { |
4017eb91 JA |
3041 | struct kiocb *kiocb = &req->rw.kiocb; |
3042 | struct file *file = req->file; | |
32960613 JA |
3043 | ssize_t ret = 0; |
3044 | ||
3045 | /* | |
3046 | * Don't support polled IO through this interface, and we can't | |
3047 | * support non-blocking either. For the latter, this just causes | |
3048 | * the kiocb to be handled from an async context. | |
3049 | */ | |
3050 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3051 | return -EOPNOTSUPP; | |
3052 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3053 | return -EAGAIN; | |
3054 | ||
3055 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3056 | struct iovec iovec; |
32960613 JA |
3057 | ssize_t nr; |
3058 | ||
311ae9e1 PB |
3059 | if (!iov_iter_is_bvec(iter)) { |
3060 | iovec = iov_iter_iovec(iter); | |
3061 | } else { | |
4017eb91 JA |
3062 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3063 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3064 | } |
3065 | ||
32960613 JA |
3066 | if (rw == READ) { |
3067 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3068 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3069 | } else { |
3070 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3071 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3072 | } |
3073 | ||
3074 | if (nr < 0) { | |
3075 | if (!ret) | |
3076 | ret = nr; | |
3077 | break; | |
3078 | } | |
3079 | ret += nr; | |
3080 | if (nr != iovec.iov_len) | |
3081 | break; | |
4017eb91 JA |
3082 | req->rw.len -= nr; |
3083 | req->rw.addr += nr; | |
32960613 JA |
3084 | iov_iter_advance(iter, nr); |
3085 | } | |
3086 | ||
3087 | return ret; | |
3088 | } | |
3089 | ||
ff6165b2 JA |
3090 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3091 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3092 | { |
e8c2bc1f | 3093 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3094 | |
ff6165b2 | 3095 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3096 | rw->free_iovec = iovec; |
227c0c96 | 3097 | rw->bytes_done = 0; |
ff6165b2 | 3098 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3099 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3100 | return; |
b64e3444 | 3101 | if (!iovec) { |
ff6165b2 JA |
3102 | unsigned iov_off = 0; |
3103 | ||
3104 | rw->iter.iov = rw->fast_iov; | |
3105 | if (iter->iov != fast_iov) { | |
3106 | iov_off = iter->iov - fast_iov; | |
3107 | rw->iter.iov += iov_off; | |
3108 | } | |
3109 | if (rw->fast_iov != fast_iov) | |
3110 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3111 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3112 | } else { |
3113 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3114 | } |
3115 | } | |
3116 | ||
6cb78689 | 3117 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3118 | { |
e8c2bc1f JA |
3119 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3120 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3121 | return req->async_data == NULL; | |
3d9932a8 XW |
3122 | } |
3123 | ||
ff6165b2 JA |
3124 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3125 | const struct iovec *fast_iov, | |
227c0c96 | 3126 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3127 | { |
26f0505a | 3128 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3129 | return 0; |
e8c2bc1f | 3130 | if (!req->async_data) { |
6cb78689 | 3131 | if (io_alloc_async_data(req)) { |
6bf985dc | 3132 | kfree(iovec); |
5d204bcf | 3133 | return -ENOMEM; |
6bf985dc | 3134 | } |
b7bb4f7d | 3135 | |
ff6165b2 | 3136 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3137 | } |
b7bb4f7d | 3138 | return 0; |
f67676d1 JA |
3139 | } |
3140 | ||
73debe68 | 3141 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3142 | { |
e8c2bc1f | 3143 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3144 | struct iovec *iov = iorw->fast_iov; |
847595de | 3145 | int ret; |
c3e330a4 | 3146 | |
2846c481 | 3147 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3148 | if (unlikely(ret < 0)) |
3149 | return ret; | |
3150 | ||
ab0b196c PB |
3151 | iorw->bytes_done = 0; |
3152 | iorw->free_iovec = iov; | |
3153 | if (iov) | |
3154 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3155 | return 0; |
3156 | } | |
3157 | ||
73debe68 | 3158 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3159 | { |
3529d8c2 JA |
3160 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3161 | return -EBADF; | |
93642ef8 | 3162 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3163 | } |
3164 | ||
c1dd91d1 JA |
3165 | /* |
3166 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3167 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3168 | * This gets called when the page is unlocked, and we generally expect that to | |
3169 | * happen when the page IO is completed and the page is now uptodate. This will | |
3170 | * queue a task_work based retry of the operation, attempting to copy the data | |
3171 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3172 | * do a thread based blocking retry of the operation. That's the unexpected | |
3173 | * slow path. | |
3174 | */ | |
bcf5a063 JA |
3175 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3176 | int sync, void *arg) | |
3177 | { | |
3178 | struct wait_page_queue *wpq; | |
3179 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3180 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3181 | |
3182 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3183 | ||
cdc8fcb4 LT |
3184 | if (!wake_page_match(wpq, key)) |
3185 | return 0; | |
3186 | ||
c8d317aa | 3187 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3188 | list_del_init(&wait->entry); |
3189 | ||
bcf5a063 | 3190 | /* submit ref gets dropped, acquire a new one */ |
de9b4cca | 3191 | req_ref_get(req); |
921b9054 | 3192 | io_req_task_queue(req); |
bcf5a063 JA |
3193 | return 1; |
3194 | } | |
3195 | ||
c1dd91d1 JA |
3196 | /* |
3197 | * This controls whether a given IO request should be armed for async page | |
3198 | * based retry. If we return false here, the request is handed to the async | |
3199 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3200 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3201 | * will either succeed because the page is now uptodate and unlocked, or it | |
3202 | * will register a callback when the page is unlocked at IO completion. Through | |
3203 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3204 | * That retry will attempt the buffered read again. The retry will generally | |
3205 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3206 | * async worker threads for a blocking retry. | |
3207 | */ | |
227c0c96 | 3208 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3209 | { |
e8c2bc1f JA |
3210 | struct io_async_rw *rw = req->async_data; |
3211 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3212 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3213 | |
bcf5a063 JA |
3214 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3215 | if (req->flags & REQ_F_NOWAIT) | |
3216 | return false; | |
f67676d1 | 3217 | |
227c0c96 | 3218 | /* Only for buffered IO */ |
3b2a4439 | 3219 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3220 | return false; |
3b2a4439 | 3221 | |
bcf5a063 JA |
3222 | /* |
3223 | * just use poll if we can, and don't attempt if the fs doesn't | |
3224 | * support callback based unlocks | |
3225 | */ | |
3226 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3227 | return false; | |
f67676d1 | 3228 | |
3b2a4439 JA |
3229 | wait->wait.func = io_async_buf_func; |
3230 | wait->wait.private = req; | |
3231 | wait->wait.flags = 0; | |
3232 | INIT_LIST_HEAD(&wait->wait.entry); | |
3233 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3234 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3235 | kiocb->ki_waitq = wait; |
3b2a4439 | 3236 | return true; |
bcf5a063 JA |
3237 | } |
3238 | ||
3239 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3240 | { | |
3241 | if (req->file->f_op->read_iter) | |
3242 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3243 | else if (req->file->f_op->read) |
4017eb91 | 3244 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3245 | else |
3246 | return -EINVAL; | |
f67676d1 JA |
3247 | } |
3248 | ||
889fca73 | 3249 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3250 | { |
3251 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3252 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3253 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3254 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3255 | ssize_t io_size, ret, ret2; |
45d189c6 | 3256 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3257 | |
2846c481 | 3258 | if (rw) { |
e8c2bc1f | 3259 | iter = &rw->iter; |
2846c481 PB |
3260 | iovec = NULL; |
3261 | } else { | |
3262 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3263 | if (ret < 0) | |
3264 | return ret; | |
3265 | } | |
632546c4 | 3266 | io_size = iov_iter_count(iter); |
fa15bafb | 3267 | req->result = io_size; |
2b188cc1 | 3268 | |
fd6c2e4c JA |
3269 | /* Ensure we clear previously set non-block flag */ |
3270 | if (!force_nonblock) | |
29de5f6a | 3271 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3272 | else |
3273 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3274 | ||
24c74678 | 3275 | /* If the file doesn't support async, just async punt */ |
7b29f92d | 3276 | if (force_nonblock && !io_file_supports_async(req, READ)) { |
6713e7a6 | 3277 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3278 | return ret ?: -EAGAIN; |
6713e7a6 | 3279 | } |
9e645e11 | 3280 | |
632546c4 | 3281 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3282 | if (unlikely(ret)) { |
3283 | kfree(iovec); | |
3284 | return ret; | |
3285 | } | |
2b188cc1 | 3286 | |
227c0c96 | 3287 | ret = io_iter_do_read(req, iter); |
32960613 | 3288 | |
230d50d4 | 3289 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3290 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3291 | /* IOPOLL retry should happen for io-wq threads */ |
3292 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3293 | goto done; |
75c668cd PB |
3294 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3295 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3296 | goto done; |
84216315 | 3297 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3298 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3299 | ret = 0; |
230d50d4 JA |
3300 | } else if (ret == -EIOCBQUEUED) { |
3301 | goto out_free; | |
7335e3bf | 3302 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3303 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3304 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3305 | goto done; |
227c0c96 JA |
3306 | } |
3307 | ||
227c0c96 | 3308 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3309 | if (ret2) |
3310 | return ret2; | |
3311 | ||
fe1cdd55 | 3312 | iovec = NULL; |
e8c2bc1f | 3313 | rw = req->async_data; |
227c0c96 | 3314 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3315 | iter = &rw->iter; |
227c0c96 | 3316 | |
b23df91b PB |
3317 | do { |
3318 | io_size -= ret; | |
3319 | rw->bytes_done += ret; | |
3320 | /* if we can retry, do so with the callbacks armed */ | |
3321 | if (!io_rw_should_retry(req)) { | |
3322 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3323 | return -EAGAIN; | |
3324 | } | |
3325 | ||
3326 | /* | |
3327 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3328 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3329 | * desired page gets unlocked. We can also get a partial read | |
3330 | * here, and if we do, then just retry at the new offset. | |
3331 | */ | |
3332 | ret = io_iter_do_read(req, iter); | |
3333 | if (ret == -EIOCBQUEUED) | |
3334 | return 0; | |
227c0c96 | 3335 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3336 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3337 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3338 | done: |
889fca73 | 3339 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3340 | out_free: |
3341 | /* it's faster to check here then delegate to kfree */ | |
3342 | if (iovec) | |
3343 | kfree(iovec); | |
5ea5dd45 | 3344 | return 0; |
2b188cc1 JA |
3345 | } |
3346 | ||
73debe68 | 3347 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3348 | { |
3529d8c2 JA |
3349 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3350 | return -EBADF; | |
93642ef8 | 3351 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3352 | } |
3353 | ||
889fca73 | 3354 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3355 | { |
3356 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3357 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3358 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3359 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3360 | ssize_t ret, ret2, io_size; |
45d189c6 | 3361 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3362 | |
2846c481 | 3363 | if (rw) { |
e8c2bc1f | 3364 | iter = &rw->iter; |
2846c481 PB |
3365 | iovec = NULL; |
3366 | } else { | |
3367 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3368 | if (ret < 0) | |
3369 | return ret; | |
3370 | } | |
632546c4 | 3371 | io_size = iov_iter_count(iter); |
fa15bafb | 3372 | req->result = io_size; |
2b188cc1 | 3373 | |
fd6c2e4c JA |
3374 | /* Ensure we clear previously set non-block flag */ |
3375 | if (!force_nonblock) | |
a88fc400 PB |
3376 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3377 | else | |
3378 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3379 | |
24c74678 | 3380 | /* If the file doesn't support async, just async punt */ |
7b29f92d | 3381 | if (force_nonblock && !io_file_supports_async(req, WRITE)) |
f67676d1 | 3382 | goto copy_iov; |
31b51510 | 3383 | |
10d59345 JA |
3384 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3385 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3386 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3387 | goto copy_iov; |
31b51510 | 3388 | |
632546c4 | 3389 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3390 | if (unlikely(ret)) |
3391 | goto out_free; | |
4ed734b0 | 3392 | |
fa15bafb PB |
3393 | /* |
3394 | * Open-code file_start_write here to grab freeze protection, | |
3395 | * which will be released by another thread in | |
3396 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3397 | * released so that it doesn't complain about the held lock when | |
3398 | * we return to userspace. | |
3399 | */ | |
3400 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3401 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3402 | __sb_writers_release(file_inode(req->file)->i_sb, |
3403 | SB_FREEZE_WRITE); | |
3404 | } | |
3405 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3406 | |
fa15bafb | 3407 | if (req->file->f_op->write_iter) |
ff6165b2 | 3408 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3409 | else if (req->file->f_op->write) |
4017eb91 | 3410 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3411 | else |
3412 | ret2 = -EINVAL; | |
4ed734b0 | 3413 | |
6ad7f233 PB |
3414 | if (req->flags & REQ_F_REISSUE) { |
3415 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3416 | ret2 = -EAGAIN; |
6ad7f233 | 3417 | } |
230d50d4 | 3418 | |
fa15bafb PB |
3419 | /* |
3420 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3421 | * retry them without IOCB_NOWAIT. | |
3422 | */ | |
3423 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3424 | ret2 = -EAGAIN; | |
75c668cd PB |
3425 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3426 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3427 | goto done; |
fa15bafb | 3428 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3429 | /* IOPOLL retry should happen for io-wq threads */ |
3430 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3431 | goto copy_iov; | |
355afaeb | 3432 | done: |
889fca73 | 3433 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3434 | } else { |
f67676d1 | 3435 | copy_iov: |
84216315 | 3436 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3437 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3438 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3439 | return ret ?: -EAGAIN; |
2b188cc1 | 3440 | } |
31b51510 | 3441 | out_free: |
f261c168 | 3442 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3443 | if (iovec) |
6f2cc166 | 3444 | kfree(iovec); |
2b188cc1 JA |
3445 | return ret; |
3446 | } | |
3447 | ||
80a261fd JA |
3448 | static int io_renameat_prep(struct io_kiocb *req, |
3449 | const struct io_uring_sqe *sqe) | |
3450 | { | |
3451 | struct io_rename *ren = &req->rename; | |
3452 | const char __user *oldf, *newf; | |
3453 | ||
3454 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3455 | return -EBADF; | |
3456 | ||
3457 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3458 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3459 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3460 | ren->new_dfd = READ_ONCE(sqe->len); | |
3461 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3462 | ||
3463 | ren->oldpath = getname(oldf); | |
3464 | if (IS_ERR(ren->oldpath)) | |
3465 | return PTR_ERR(ren->oldpath); | |
3466 | ||
3467 | ren->newpath = getname(newf); | |
3468 | if (IS_ERR(ren->newpath)) { | |
3469 | putname(ren->oldpath); | |
3470 | return PTR_ERR(ren->newpath); | |
3471 | } | |
3472 | ||
3473 | req->flags |= REQ_F_NEED_CLEANUP; | |
3474 | return 0; | |
3475 | } | |
3476 | ||
45d189c6 | 3477 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3478 | { |
3479 | struct io_rename *ren = &req->rename; | |
3480 | int ret; | |
3481 | ||
45d189c6 | 3482 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3483 | return -EAGAIN; |
3484 | ||
3485 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3486 | ren->newpath, ren->flags); | |
3487 | ||
3488 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3489 | if (ret < 0) | |
3490 | req_set_fail_links(req); | |
3491 | io_req_complete(req, ret); | |
3492 | return 0; | |
3493 | } | |
3494 | ||
14a1143b JA |
3495 | static int io_unlinkat_prep(struct io_kiocb *req, |
3496 | const struct io_uring_sqe *sqe) | |
3497 | { | |
3498 | struct io_unlink *un = &req->unlink; | |
3499 | const char __user *fname; | |
3500 | ||
3501 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3502 | return -EBADF; | |
3503 | ||
3504 | un->dfd = READ_ONCE(sqe->fd); | |
3505 | ||
3506 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3507 | if (un->flags & ~AT_REMOVEDIR) | |
3508 | return -EINVAL; | |
3509 | ||
3510 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3511 | un->filename = getname(fname); | |
3512 | if (IS_ERR(un->filename)) | |
3513 | return PTR_ERR(un->filename); | |
3514 | ||
3515 | req->flags |= REQ_F_NEED_CLEANUP; | |
3516 | return 0; | |
3517 | } | |
3518 | ||
45d189c6 | 3519 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3520 | { |
3521 | struct io_unlink *un = &req->unlink; | |
3522 | int ret; | |
3523 | ||
45d189c6 | 3524 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3525 | return -EAGAIN; |
3526 | ||
3527 | if (un->flags & AT_REMOVEDIR) | |
3528 | ret = do_rmdir(un->dfd, un->filename); | |
3529 | else | |
3530 | ret = do_unlinkat(un->dfd, un->filename); | |
3531 | ||
3532 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3533 | if (ret < 0) | |
3534 | req_set_fail_links(req); | |
3535 | io_req_complete(req, ret); | |
3536 | return 0; | |
3537 | } | |
3538 | ||
36f4fa68 JA |
3539 | static int io_shutdown_prep(struct io_kiocb *req, |
3540 | const struct io_uring_sqe *sqe) | |
3541 | { | |
3542 | #if defined(CONFIG_NET) | |
3543 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3544 | return -EINVAL; | |
3545 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3546 | sqe->buf_index) | |
3547 | return -EINVAL; | |
3548 | ||
3549 | req->shutdown.how = READ_ONCE(sqe->len); | |
3550 | return 0; | |
3551 | #else | |
3552 | return -EOPNOTSUPP; | |
3553 | #endif | |
3554 | } | |
3555 | ||
45d189c6 | 3556 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3557 | { |
3558 | #if defined(CONFIG_NET) | |
3559 | struct socket *sock; | |
3560 | int ret; | |
3561 | ||
45d189c6 | 3562 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3563 | return -EAGAIN; |
3564 | ||
48aba79b | 3565 | sock = sock_from_file(req->file); |
36f4fa68 | 3566 | if (unlikely(!sock)) |
48aba79b | 3567 | return -ENOTSOCK; |
36f4fa68 JA |
3568 | |
3569 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d JA |
3570 | if (ret < 0) |
3571 | req_set_fail_links(req); | |
36f4fa68 JA |
3572 | io_req_complete(req, ret); |
3573 | return 0; | |
3574 | #else | |
3575 | return -EOPNOTSUPP; | |
3576 | #endif | |
3577 | } | |
3578 | ||
f2a8d5c7 PB |
3579 | static int __io_splice_prep(struct io_kiocb *req, |
3580 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3581 | { |
3582 | struct io_splice* sp = &req->splice; | |
3583 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3584 | |
3232dd02 PB |
3585 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3586 | return -EINVAL; | |
7d67af2c PB |
3587 | |
3588 | sp->file_in = NULL; | |
7d67af2c PB |
3589 | sp->len = READ_ONCE(sqe->len); |
3590 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3591 | ||
3592 | if (unlikely(sp->flags & ~valid_flags)) | |
3593 | return -EINVAL; | |
3594 | ||
8371adf5 PB |
3595 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3596 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3597 | if (!sp->file_in) | |
3598 | return -EBADF; | |
7d67af2c | 3599 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3600 | return 0; |
3601 | } | |
3602 | ||
f2a8d5c7 PB |
3603 | static int io_tee_prep(struct io_kiocb *req, |
3604 | const struct io_uring_sqe *sqe) | |
3605 | { | |
3606 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3607 | return -EINVAL; | |
3608 | return __io_splice_prep(req, sqe); | |
3609 | } | |
3610 | ||
45d189c6 | 3611 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3612 | { |
3613 | struct io_splice *sp = &req->splice; | |
3614 | struct file *in = sp->file_in; | |
3615 | struct file *out = sp->file_out; | |
3616 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3617 | long ret = 0; | |
3618 | ||
45d189c6 | 3619 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3620 | return -EAGAIN; |
3621 | if (sp->len) | |
3622 | ret = do_tee(in, out, sp->len, flags); | |
3623 | ||
e1d767f0 PB |
3624 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3625 | io_put_file(in); | |
f2a8d5c7 PB |
3626 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3627 | ||
f2a8d5c7 PB |
3628 | if (ret != sp->len) |
3629 | req_set_fail_links(req); | |
e1e16097 | 3630 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3631 | return 0; |
3632 | } | |
3633 | ||
3634 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3635 | { | |
3636 | struct io_splice* sp = &req->splice; | |
3637 | ||
3638 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3639 | sp->off_out = READ_ONCE(sqe->off); | |
3640 | return __io_splice_prep(req, sqe); | |
3641 | } | |
3642 | ||
45d189c6 | 3643 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3644 | { |
3645 | struct io_splice *sp = &req->splice; | |
3646 | struct file *in = sp->file_in; | |
3647 | struct file *out = sp->file_out; | |
3648 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3649 | loff_t *poff_in, *poff_out; | |
c9687426 | 3650 | long ret = 0; |
7d67af2c | 3651 | |
45d189c6 | 3652 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3653 | return -EAGAIN; |
7d67af2c PB |
3654 | |
3655 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3656 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3657 | |
948a7749 | 3658 | if (sp->len) |
c9687426 | 3659 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 3660 | |
e1d767f0 PB |
3661 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3662 | io_put_file(in); | |
7d67af2c PB |
3663 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3664 | ||
7d67af2c PB |
3665 | if (ret != sp->len) |
3666 | req_set_fail_links(req); | |
e1e16097 | 3667 | io_req_complete(req, ret); |
7d67af2c PB |
3668 | return 0; |
3669 | } | |
3670 | ||
2b188cc1 JA |
3671 | /* |
3672 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3673 | */ | |
889fca73 | 3674 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3675 | { |
3676 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3677 | |
def596e9 JA |
3678 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3679 | return -EINVAL; | |
3680 | ||
889fca73 | 3681 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
3682 | return 0; |
3683 | } | |
3684 | ||
1155c76a | 3685 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3686 | { |
6b06314c | 3687 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3688 | |
09bb8394 JA |
3689 | if (!req->file) |
3690 | return -EBADF; | |
c992fe29 | 3691 | |
6b06314c | 3692 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3693 | return -EINVAL; |
edafccee | 3694 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3695 | return -EINVAL; |
3696 | ||
8ed8d3c3 JA |
3697 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3698 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3699 | return -EINVAL; | |
3700 | ||
3701 | req->sync.off = READ_ONCE(sqe->off); | |
3702 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3703 | return 0; |
3704 | } | |
3705 | ||
45d189c6 | 3706 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 3707 | { |
8ed8d3c3 | 3708 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3709 | int ret; |
3710 | ||
ac45abc0 | 3711 | /* fsync always requires a blocking context */ |
45d189c6 | 3712 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
3713 | return -EAGAIN; |
3714 | ||
9adbd45d | 3715 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3716 | end > 0 ? end : LLONG_MAX, |
3717 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3718 | if (ret < 0) | |
3719 | req_set_fail_links(req); | |
e1e16097 | 3720 | io_req_complete(req, ret); |
c992fe29 CH |
3721 | return 0; |
3722 | } | |
3723 | ||
d63d1b5e JA |
3724 | static int io_fallocate_prep(struct io_kiocb *req, |
3725 | const struct io_uring_sqe *sqe) | |
3726 | { | |
3727 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3728 | return -EINVAL; | |
3232dd02 PB |
3729 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3730 | return -EINVAL; | |
d63d1b5e JA |
3731 | |
3732 | req->sync.off = READ_ONCE(sqe->off); | |
3733 | req->sync.len = READ_ONCE(sqe->addr); | |
3734 | req->sync.mode = READ_ONCE(sqe->len); | |
3735 | return 0; | |
3736 | } | |
3737 | ||
45d189c6 | 3738 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 3739 | { |
ac45abc0 PB |
3740 | int ret; |
3741 | ||
d63d1b5e | 3742 | /* fallocate always requiring blocking context */ |
45d189c6 | 3743 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 3744 | return -EAGAIN; |
ac45abc0 PB |
3745 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3746 | req->sync.len); | |
ac45abc0 PB |
3747 | if (ret < 0) |
3748 | req_set_fail_links(req); | |
e1e16097 | 3749 | io_req_complete(req, ret); |
5d17b4a4 JA |
3750 | return 0; |
3751 | } | |
3752 | ||
ec65fea5 | 3753 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3754 | { |
f8748881 | 3755 | const char __user *fname; |
15b71abe | 3756 | int ret; |
b7bb4f7d | 3757 | |
ec65fea5 | 3758 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3759 | return -EINVAL; |
ec65fea5 | 3760 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3761 | return -EBADF; |
03b1230c | 3762 | |
ec65fea5 PB |
3763 | /* open.how should be already initialised */ |
3764 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3765 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3766 | |
25e72d10 PB |
3767 | req->open.dfd = READ_ONCE(sqe->fd); |
3768 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3769 | req->open.filename = getname(fname); |
15b71abe JA |
3770 | if (IS_ERR(req->open.filename)) { |
3771 | ret = PTR_ERR(req->open.filename); | |
3772 | req->open.filename = NULL; | |
3773 | return ret; | |
3774 | } | |
4022e7af | 3775 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3776 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3777 | return 0; |
03b1230c JA |
3778 | } |
3779 | ||
ec65fea5 PB |
3780 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3781 | { | |
3782 | u64 flags, mode; | |
3783 | ||
14587a46 | 3784 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3785 | return -EINVAL; |
ec65fea5 PB |
3786 | mode = READ_ONCE(sqe->len); |
3787 | flags = READ_ONCE(sqe->open_flags); | |
3788 | req->open.how = build_open_how(flags, mode); | |
3789 | return __io_openat_prep(req, sqe); | |
3790 | } | |
3791 | ||
cebdb986 | 3792 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3793 | { |
cebdb986 | 3794 | struct open_how __user *how; |
cebdb986 | 3795 | size_t len; |
0fa03c62 JA |
3796 | int ret; |
3797 | ||
14587a46 | 3798 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3799 | return -EINVAL; |
cebdb986 JA |
3800 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3801 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3802 | if (len < OPEN_HOW_SIZE_VER0) |
3803 | return -EINVAL; | |
3529d8c2 | 3804 | |
cebdb986 JA |
3805 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3806 | len); | |
3807 | if (ret) | |
3808 | return ret; | |
3529d8c2 | 3809 | |
ec65fea5 | 3810 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3811 | } |
3812 | ||
45d189c6 | 3813 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
3814 | { |
3815 | struct open_flags op; | |
15b71abe | 3816 | struct file *file; |
3a81fd02 JA |
3817 | bool nonblock_set; |
3818 | bool resolve_nonblock; | |
15b71abe JA |
3819 | int ret; |
3820 | ||
cebdb986 | 3821 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3822 | if (ret) |
3823 | goto err; | |
3a81fd02 JA |
3824 | nonblock_set = op.open_flag & O_NONBLOCK; |
3825 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 3826 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
3827 | /* |
3828 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
3829 | * it'll always -EAGAIN | |
3830 | */ | |
3831 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
3832 | return -EAGAIN; | |
3833 | op.lookup_flags |= LOOKUP_CACHED; | |
3834 | op.open_flag |= O_NONBLOCK; | |
3835 | } | |
15b71abe | 3836 | |
4022e7af | 3837 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3838 | if (ret < 0) |
3839 | goto err; | |
3840 | ||
3841 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3a81fd02 | 3842 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
45d189c6 PB |
3843 | if ((!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK)) && |
3844 | file == ERR_PTR(-EAGAIN)) { | |
944d1444 | 3845 | /* |
3a81fd02 JA |
3846 | * We could hang on to this 'fd', but seems like marginal |
3847 | * gain for something that is now known to be a slower path. | |
3848 | * So just put it, and we'll get a new one when we retry. | |
944d1444 | 3849 | */ |
3a81fd02 JA |
3850 | put_unused_fd(ret); |
3851 | return -EAGAIN; | |
3852 | } | |
3853 | ||
15b71abe JA |
3854 | if (IS_ERR(file)) { |
3855 | put_unused_fd(ret); | |
3856 | ret = PTR_ERR(file); | |
3857 | } else { | |
45d189c6 | 3858 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) |
3a81fd02 | 3859 | file->f_flags &= ~O_NONBLOCK; |
15b71abe JA |
3860 | fsnotify_open(file); |
3861 | fd_install(ret, file); | |
3862 | } | |
3863 | err: | |
3864 | putname(req->open.filename); | |
8fef80bf | 3865 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3866 | if (ret < 0) |
3867 | req_set_fail_links(req); | |
e1e16097 | 3868 | io_req_complete(req, ret); |
15b71abe JA |
3869 | return 0; |
3870 | } | |
3871 | ||
45d189c6 | 3872 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 3873 | { |
e45cff58 | 3874 | return io_openat2(req, issue_flags); |
cebdb986 JA |
3875 | } |
3876 | ||
067524e9 JA |
3877 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3878 | const struct io_uring_sqe *sqe) | |
3879 | { | |
3880 | struct io_provide_buf *p = &req->pbuf; | |
3881 | u64 tmp; | |
3882 | ||
3883 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3884 | return -EINVAL; | |
3885 | ||
3886 | tmp = READ_ONCE(sqe->fd); | |
3887 | if (!tmp || tmp > USHRT_MAX) | |
3888 | return -EINVAL; | |
3889 | ||
3890 | memset(p, 0, sizeof(*p)); | |
3891 | p->nbufs = tmp; | |
3892 | p->bgid = READ_ONCE(sqe->buf_group); | |
3893 | return 0; | |
3894 | } | |
3895 | ||
3896 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3897 | int bgid, unsigned nbufs) | |
3898 | { | |
3899 | unsigned i = 0; | |
3900 | ||
3901 | /* shouldn't happen */ | |
3902 | if (!nbufs) | |
3903 | return 0; | |
3904 | ||
3905 | /* the head kbuf is the list itself */ | |
3906 | while (!list_empty(&buf->list)) { | |
3907 | struct io_buffer *nxt; | |
3908 | ||
3909 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3910 | list_del(&nxt->list); | |
3911 | kfree(nxt); | |
3912 | if (++i == nbufs) | |
3913 | return i; | |
3914 | } | |
3915 | i++; | |
3916 | kfree(buf); | |
9e15c3a0 | 3917 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
3918 | |
3919 | return i; | |
3920 | } | |
3921 | ||
889fca73 | 3922 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
3923 | { |
3924 | struct io_provide_buf *p = &req->pbuf; | |
3925 | struct io_ring_ctx *ctx = req->ctx; | |
3926 | struct io_buffer *head; | |
3927 | int ret = 0; | |
45d189c6 | 3928 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
3929 | |
3930 | io_ring_submit_lock(ctx, !force_nonblock); | |
3931 | ||
3932 | lockdep_assert_held(&ctx->uring_lock); | |
3933 | ||
3934 | ret = -ENOENT; | |
9e15c3a0 | 3935 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
3936 | if (head) |
3937 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 JA |
3938 | if (ret < 0) |
3939 | req_set_fail_links(req); | |
067524e9 | 3940 | |
9fb8cb49 PB |
3941 | /* complete before unlock, IOPOLL may need the lock */ |
3942 | __io_req_complete(req, issue_flags, ret, 0); | |
3943 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
3944 | return 0; |
3945 | } | |
3946 | ||
ddf0322d JA |
3947 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3948 | const struct io_uring_sqe *sqe) | |
3949 | { | |
d81269fe | 3950 | unsigned long size; |
ddf0322d JA |
3951 | struct io_provide_buf *p = &req->pbuf; |
3952 | u64 tmp; | |
3953 | ||
3954 | if (sqe->ioprio || sqe->rw_flags) | |
3955 | return -EINVAL; | |
3956 | ||
3957 | tmp = READ_ONCE(sqe->fd); | |
3958 | if (!tmp || tmp > USHRT_MAX) | |
3959 | return -E2BIG; | |
3960 | p->nbufs = tmp; | |
3961 | p->addr = READ_ONCE(sqe->addr); | |
3962 | p->len = READ_ONCE(sqe->len); | |
3963 | ||
d81269fe PB |
3964 | size = (unsigned long)p->len * p->nbufs; |
3965 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
3966 | return -EFAULT; |
3967 | ||
3968 | p->bgid = READ_ONCE(sqe->buf_group); | |
3969 | tmp = READ_ONCE(sqe->off); | |
3970 | if (tmp > USHRT_MAX) | |
3971 | return -E2BIG; | |
3972 | p->bid = tmp; | |
3973 | return 0; | |
3974 | } | |
3975 | ||
3976 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3977 | { | |
3978 | struct io_buffer *buf; | |
3979 | u64 addr = pbuf->addr; | |
3980 | int i, bid = pbuf->bid; | |
3981 | ||
3982 | for (i = 0; i < pbuf->nbufs; i++) { | |
3983 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3984 | if (!buf) | |
3985 | break; | |
3986 | ||
3987 | buf->addr = addr; | |
3988 | buf->len = pbuf->len; | |
3989 | buf->bid = bid; | |
3990 | addr += pbuf->len; | |
3991 | bid++; | |
3992 | if (!*head) { | |
3993 | INIT_LIST_HEAD(&buf->list); | |
3994 | *head = buf; | |
3995 | } else { | |
3996 | list_add_tail(&buf->list, &(*head)->list); | |
3997 | } | |
3998 | } | |
3999 | ||
4000 | return i ? i : -ENOMEM; | |
4001 | } | |
4002 | ||
889fca73 | 4003 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4004 | { |
4005 | struct io_provide_buf *p = &req->pbuf; | |
4006 | struct io_ring_ctx *ctx = req->ctx; | |
4007 | struct io_buffer *head, *list; | |
4008 | int ret = 0; | |
45d189c6 | 4009 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4010 | |
4011 | io_ring_submit_lock(ctx, !force_nonblock); | |
4012 | ||
4013 | lockdep_assert_held(&ctx->uring_lock); | |
4014 | ||
9e15c3a0 | 4015 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4016 | |
4017 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4018 | if (ret >= 0 && !list) { |
4019 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4020 | if (ret < 0) | |
067524e9 | 4021 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4022 | } |
ddf0322d JA |
4023 | if (ret < 0) |
4024 | req_set_fail_links(req); | |
9fb8cb49 PB |
4025 | /* complete before unlock, IOPOLL may need the lock */ |
4026 | __io_req_complete(req, issue_flags, ret, 0); | |
4027 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4028 | return 0; |
cebdb986 JA |
4029 | } |
4030 | ||
3e4827b0 JA |
4031 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4032 | const struct io_uring_sqe *sqe) | |
4033 | { | |
4034 | #if defined(CONFIG_EPOLL) | |
4035 | if (sqe->ioprio || sqe->buf_index) | |
4036 | return -EINVAL; | |
6ca56f84 | 4037 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4038 | return -EINVAL; |
3e4827b0 JA |
4039 | |
4040 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4041 | req->epoll.op = READ_ONCE(sqe->len); | |
4042 | req->epoll.fd = READ_ONCE(sqe->off); | |
4043 | ||
4044 | if (ep_op_has_event(req->epoll.op)) { | |
4045 | struct epoll_event __user *ev; | |
4046 | ||
4047 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4048 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4049 | return -EFAULT; | |
4050 | } | |
4051 | ||
4052 | return 0; | |
4053 | #else | |
4054 | return -EOPNOTSUPP; | |
4055 | #endif | |
4056 | } | |
4057 | ||
889fca73 | 4058 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4059 | { |
4060 | #if defined(CONFIG_EPOLL) | |
4061 | struct io_epoll *ie = &req->epoll; | |
4062 | int ret; | |
45d189c6 | 4063 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4064 | |
4065 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4066 | if (force_nonblock && ret == -EAGAIN) | |
4067 | return -EAGAIN; | |
4068 | ||
4069 | if (ret < 0) | |
4070 | req_set_fail_links(req); | |
889fca73 | 4071 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4072 | return 0; |
4073 | #else | |
4074 | return -EOPNOTSUPP; | |
4075 | #endif | |
4076 | } | |
4077 | ||
c1ca757b JA |
4078 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4079 | { | |
4080 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4081 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4082 | return -EINVAL; | |
3232dd02 PB |
4083 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4084 | return -EINVAL; | |
c1ca757b JA |
4085 | |
4086 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4087 | req->madvise.len = READ_ONCE(sqe->len); | |
4088 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4089 | return 0; | |
4090 | #else | |
4091 | return -EOPNOTSUPP; | |
4092 | #endif | |
4093 | } | |
4094 | ||
45d189c6 | 4095 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4096 | { |
4097 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4098 | struct io_madvise *ma = &req->madvise; | |
4099 | int ret; | |
4100 | ||
45d189c6 | 4101 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4102 | return -EAGAIN; |
4103 | ||
0726b01e | 4104 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4105 | if (ret < 0) |
4106 | req_set_fail_links(req); | |
e1e16097 | 4107 | io_req_complete(req, ret); |
c1ca757b JA |
4108 | return 0; |
4109 | #else | |
4110 | return -EOPNOTSUPP; | |
4111 | #endif | |
4112 | } | |
4113 | ||
4840e418 JA |
4114 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4115 | { | |
4116 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4117 | return -EINVAL; | |
3232dd02 PB |
4118 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4119 | return -EINVAL; | |
4840e418 JA |
4120 | |
4121 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4122 | req->fadvise.len = READ_ONCE(sqe->len); | |
4123 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4124 | return 0; | |
4125 | } | |
4126 | ||
45d189c6 | 4127 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4128 | { |
4129 | struct io_fadvise *fa = &req->fadvise; | |
4130 | int ret; | |
4131 | ||
45d189c6 | 4132 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4133 | switch (fa->advice) { |
4134 | case POSIX_FADV_NORMAL: | |
4135 | case POSIX_FADV_RANDOM: | |
4136 | case POSIX_FADV_SEQUENTIAL: | |
4137 | break; | |
4138 | default: | |
4139 | return -EAGAIN; | |
4140 | } | |
4141 | } | |
4840e418 JA |
4142 | |
4143 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4144 | if (ret < 0) | |
4145 | req_set_fail_links(req); | |
e1e16097 | 4146 | io_req_complete(req, ret); |
4840e418 JA |
4147 | return 0; |
4148 | } | |
4149 | ||
eddc7ef5 JA |
4150 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4151 | { | |
6ca56f84 | 4152 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4153 | return -EINVAL; |
eddc7ef5 JA |
4154 | if (sqe->ioprio || sqe->buf_index) |
4155 | return -EINVAL; | |
9c280f90 | 4156 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4157 | return -EBADF; |
eddc7ef5 | 4158 | |
1d9e1288 BM |
4159 | req->statx.dfd = READ_ONCE(sqe->fd); |
4160 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4161 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4162 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4163 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4164 | |
4165 | return 0; | |
4166 | } | |
4167 | ||
45d189c6 | 4168 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4169 | { |
1d9e1288 | 4170 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4171 | int ret; |
4172 | ||
59d70013 | 4173 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4174 | return -EAGAIN; |
4175 | ||
e62753e4 BM |
4176 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4177 | ctx->buffer); | |
eddc7ef5 | 4178 | |
eddc7ef5 JA |
4179 | if (ret < 0) |
4180 | req_set_fail_links(req); | |
e1e16097 | 4181 | io_req_complete(req, ret); |
eddc7ef5 JA |
4182 | return 0; |
4183 | } | |
4184 | ||
b5dba59e JA |
4185 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4186 | { | |
14587a46 | 4187 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4188 | return -EINVAL; |
b5dba59e JA |
4189 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4190 | sqe->rw_flags || sqe->buf_index) | |
4191 | return -EINVAL; | |
9c280f90 | 4192 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4193 | return -EBADF; |
b5dba59e JA |
4194 | |
4195 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4196 | return 0; |
b5dba59e JA |
4197 | } |
4198 | ||
889fca73 | 4199 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4200 | { |
9eac1904 | 4201 | struct files_struct *files = current->files; |
3af73b28 | 4202 | struct io_close *close = &req->close; |
9eac1904 JA |
4203 | struct fdtable *fdt; |
4204 | struct file *file; | |
b5dba59e JA |
4205 | int ret; |
4206 | ||
9eac1904 JA |
4207 | file = NULL; |
4208 | ret = -EBADF; | |
4209 | spin_lock(&files->file_lock); | |
4210 | fdt = files_fdtable(files); | |
4211 | if (close->fd >= fdt->max_fds) { | |
4212 | spin_unlock(&files->file_lock); | |
4213 | goto err; | |
4214 | } | |
4215 | file = fdt->fd[close->fd]; | |
4216 | if (!file) { | |
4217 | spin_unlock(&files->file_lock); | |
4218 | goto err; | |
4219 | } | |
4220 | ||
4221 | if (file->f_op == &io_uring_fops) { | |
4222 | spin_unlock(&files->file_lock); | |
4223 | file = NULL; | |
4224 | goto err; | |
3af73b28 | 4225 | } |
b5dba59e JA |
4226 | |
4227 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4228 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4229 | spin_unlock(&files->file_lock); |
0bf0eefd | 4230 | return -EAGAIN; |
a2100672 | 4231 | } |
b5dba59e | 4232 | |
9eac1904 JA |
4233 | ret = __close_fd_get_file(close->fd, &file); |
4234 | spin_unlock(&files->file_lock); | |
4235 | if (ret < 0) { | |
4236 | if (ret == -ENOENT) | |
4237 | ret = -EBADF; | |
4238 | goto err; | |
4239 | } | |
4240 | ||
3af73b28 | 4241 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4242 | ret = filp_close(file, current->files); |
4243 | err: | |
3af73b28 PB |
4244 | if (ret < 0) |
4245 | req_set_fail_links(req); | |
9eac1904 JA |
4246 | if (file) |
4247 | fput(file); | |
889fca73 | 4248 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4249 | return 0; |
b5dba59e JA |
4250 | } |
4251 | ||
1155c76a | 4252 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4253 | { |
4254 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4255 | |
5d17b4a4 JA |
4256 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4257 | return -EINVAL; | |
4258 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4259 | return -EINVAL; | |
4260 | ||
8ed8d3c3 JA |
4261 | req->sync.off = READ_ONCE(sqe->off); |
4262 | req->sync.len = READ_ONCE(sqe->len); | |
4263 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4264 | return 0; |
4265 | } | |
4266 | ||
45d189c6 | 4267 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4268 | { |
8ed8d3c3 JA |
4269 | int ret; |
4270 | ||
ac45abc0 | 4271 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4272 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4273 | return -EAGAIN; |
4274 | ||
9adbd45d | 4275 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4276 | req->sync.flags); |
4277 | if (ret < 0) | |
4278 | req_set_fail_links(req); | |
e1e16097 | 4279 | io_req_complete(req, ret); |
5d17b4a4 JA |
4280 | return 0; |
4281 | } | |
4282 | ||
469956e8 | 4283 | #if defined(CONFIG_NET) |
02d27d89 PB |
4284 | static int io_setup_async_msg(struct io_kiocb *req, |
4285 | struct io_async_msghdr *kmsg) | |
4286 | { | |
e8c2bc1f JA |
4287 | struct io_async_msghdr *async_msg = req->async_data; |
4288 | ||
4289 | if (async_msg) | |
02d27d89 | 4290 | return -EAGAIN; |
e8c2bc1f | 4291 | if (io_alloc_async_data(req)) { |
257e84a5 | 4292 | kfree(kmsg->free_iov); |
02d27d89 PB |
4293 | return -ENOMEM; |
4294 | } | |
e8c2bc1f | 4295 | async_msg = req->async_data; |
02d27d89 | 4296 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4297 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4298 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4299 | /* if were using fast_iov, set it to the new one */ |
4300 | if (!async_msg->free_iov) | |
4301 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4302 | ||
02d27d89 PB |
4303 | return -EAGAIN; |
4304 | } | |
4305 | ||
2ae523ed PB |
4306 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4307 | struct io_async_msghdr *iomsg) | |
4308 | { | |
2ae523ed | 4309 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4310 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4311 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4312 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4313 | } |
4314 | ||
93642ef8 PB |
4315 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4316 | { | |
4317 | int ret; | |
4318 | ||
93642ef8 PB |
4319 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4320 | if (!ret) | |
4321 | req->flags |= REQ_F_NEED_CLEANUP; | |
4322 | return ret; | |
4323 | } | |
4324 | ||
3529d8c2 | 4325 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4326 | { |
e47293fd | 4327 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4328 | |
d2b6f48b PB |
4329 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4330 | return -EINVAL; | |
4331 | ||
e47293fd | 4332 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4333 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4334 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4335 | |
d8768362 JA |
4336 | #ifdef CONFIG_COMPAT |
4337 | if (req->ctx->compat) | |
4338 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4339 | #endif | |
93642ef8 | 4340 | return 0; |
03b1230c JA |
4341 | } |
4342 | ||
889fca73 | 4343 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4344 | { |
6b754c8b | 4345 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4346 | struct socket *sock; |
7a7cacba | 4347 | unsigned flags; |
0031275d | 4348 | int min_ret = 0; |
0fa03c62 JA |
4349 | int ret; |
4350 | ||
dba4a925 | 4351 | sock = sock_from_file(req->file); |
7a7cacba | 4352 | if (unlikely(!sock)) |
dba4a925 | 4353 | return -ENOTSOCK; |
3529d8c2 | 4354 | |
257e84a5 PB |
4355 | kmsg = req->async_data; |
4356 | if (!kmsg) { | |
7a7cacba PB |
4357 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4358 | if (ret) | |
4359 | return ret; | |
4360 | kmsg = &iomsg; | |
0fa03c62 | 4361 | } |
0fa03c62 | 4362 | |
76cd979f | 4363 | flags = req->sr_msg.msg_flags | MSG_NOSIGNAL; |
7a7cacba PB |
4364 | if (flags & MSG_DONTWAIT) |
4365 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4366 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4367 | flags |= MSG_DONTWAIT; |
e47293fd | 4368 | |
0031275d SM |
4369 | if (flags & MSG_WAITALL) |
4370 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4371 | ||
7a7cacba | 4372 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4373 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4374 | return io_setup_async_msg(req, kmsg); |
4375 | if (ret == -ERESTARTSYS) | |
4376 | ret = -EINTR; | |
0fa03c62 | 4377 | |
257e84a5 PB |
4378 | /* fast path, check for non-NULL to avoid function call */ |
4379 | if (kmsg->free_iov) | |
4380 | kfree(kmsg->free_iov); | |
99bc4c38 | 4381 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4382 | if (ret < min_ret) |
4e88d6e7 | 4383 | req_set_fail_links(req); |
889fca73 | 4384 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4385 | return 0; |
03b1230c | 4386 | } |
aa1fa28f | 4387 | |
889fca73 | 4388 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4389 | { |
7a7cacba PB |
4390 | struct io_sr_msg *sr = &req->sr_msg; |
4391 | struct msghdr msg; | |
4392 | struct iovec iov; | |
fddaface | 4393 | struct socket *sock; |
7a7cacba | 4394 | unsigned flags; |
0031275d | 4395 | int min_ret = 0; |
fddaface JA |
4396 | int ret; |
4397 | ||
dba4a925 | 4398 | sock = sock_from_file(req->file); |
7a7cacba | 4399 | if (unlikely(!sock)) |
dba4a925 | 4400 | return -ENOTSOCK; |
fddaface | 4401 | |
7a7cacba PB |
4402 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4403 | if (unlikely(ret)) | |
14db8411 | 4404 | return ret; |
fddaface | 4405 | |
7a7cacba PB |
4406 | msg.msg_name = NULL; |
4407 | msg.msg_control = NULL; | |
4408 | msg.msg_controllen = 0; | |
4409 | msg.msg_namelen = 0; | |
fddaface | 4410 | |
76cd979f | 4411 | flags = req->sr_msg.msg_flags | MSG_NOSIGNAL; |
7a7cacba PB |
4412 | if (flags & MSG_DONTWAIT) |
4413 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4414 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4415 | flags |= MSG_DONTWAIT; |
fddaface | 4416 | |
0031275d SM |
4417 | if (flags & MSG_WAITALL) |
4418 | min_ret = iov_iter_count(&msg.msg_iter); | |
4419 | ||
7a7cacba PB |
4420 | msg.msg_flags = flags; |
4421 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4422 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4423 | return -EAGAIN; |
4424 | if (ret == -ERESTARTSYS) | |
4425 | ret = -EINTR; | |
fddaface | 4426 | |
0031275d | 4427 | if (ret < min_ret) |
fddaface | 4428 | req_set_fail_links(req); |
889fca73 | 4429 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4430 | return 0; |
fddaface JA |
4431 | } |
4432 | ||
1400e697 PB |
4433 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4434 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4435 | { |
4436 | struct io_sr_msg *sr = &req->sr_msg; | |
4437 | struct iovec __user *uiov; | |
4438 | size_t iov_len; | |
4439 | int ret; | |
4440 | ||
1400e697 PB |
4441 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4442 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4443 | if (ret) |
4444 | return ret; | |
4445 | ||
4446 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4447 | if (iov_len > 1) | |
4448 | return -EINVAL; | |
5476dfed | 4449 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4450 | return -EFAULT; |
5476dfed | 4451 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4452 | iomsg->free_iov = NULL; |
52de1fe1 | 4453 | } else { |
257e84a5 | 4454 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4455 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4456 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4457 | false); |
52de1fe1 JA |
4458 | if (ret > 0) |
4459 | ret = 0; | |
4460 | } | |
4461 | ||
4462 | return ret; | |
4463 | } | |
4464 | ||
4465 | #ifdef CONFIG_COMPAT | |
4466 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4467 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4468 | { |
4469 | struct compat_msghdr __user *msg_compat; | |
4470 | struct io_sr_msg *sr = &req->sr_msg; | |
4471 | struct compat_iovec __user *uiov; | |
4472 | compat_uptr_t ptr; | |
4473 | compat_size_t len; | |
4474 | int ret; | |
4475 | ||
270a5940 | 4476 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4477 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4478 | &ptr, &len); |
4479 | if (ret) | |
4480 | return ret; | |
4481 | ||
4482 | uiov = compat_ptr(ptr); | |
4483 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4484 | compat_ssize_t clen; | |
4485 | ||
4486 | if (len > 1) | |
4487 | return -EINVAL; | |
4488 | if (!access_ok(uiov, sizeof(*uiov))) | |
4489 | return -EFAULT; | |
4490 | if (__get_user(clen, &uiov->iov_len)) | |
4491 | return -EFAULT; | |
4492 | if (clen < 0) | |
4493 | return -EINVAL; | |
2d280bc8 | 4494 | sr->len = clen; |
257e84a5 | 4495 | iomsg->free_iov = NULL; |
52de1fe1 | 4496 | } else { |
257e84a5 | 4497 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4498 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4499 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4500 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4501 | if (ret < 0) |
4502 | return ret; | |
4503 | } | |
4504 | ||
4505 | return 0; | |
4506 | } | |
4507 | #endif | |
4508 | ||
1400e697 PB |
4509 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4510 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4511 | { |
1400e697 | 4512 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4513 | |
4514 | #ifdef CONFIG_COMPAT | |
4515 | if (req->ctx->compat) | |
1400e697 | 4516 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4517 | #endif |
52de1fe1 | 4518 | |
1400e697 | 4519 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4520 | } |
4521 | ||
bcda7baa | 4522 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4523 | bool needs_lock) |
bcda7baa JA |
4524 | { |
4525 | struct io_sr_msg *sr = &req->sr_msg; | |
4526 | struct io_buffer *kbuf; | |
4527 | ||
bcda7baa JA |
4528 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4529 | if (IS_ERR(kbuf)) | |
4530 | return kbuf; | |
4531 | ||
4532 | sr->kbuf = kbuf; | |
4533 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4534 | return kbuf; |
fddaface JA |
4535 | } |
4536 | ||
7fbb1b54 PB |
4537 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4538 | { | |
4539 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4540 | } | |
4541 | ||
93642ef8 | 4542 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4543 | { |
99bc4c38 | 4544 | int ret; |
3529d8c2 | 4545 | |
93642ef8 PB |
4546 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4547 | if (!ret) | |
4548 | req->flags |= REQ_F_NEED_CLEANUP; | |
4549 | return ret; | |
4550 | } | |
4551 | ||
4552 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4553 | { | |
4554 | struct io_sr_msg *sr = &req->sr_msg; | |
4555 | ||
d2b6f48b PB |
4556 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4557 | return -EINVAL; | |
4558 | ||
3529d8c2 | 4559 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4560 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4561 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4562 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4563 | |
d8768362 JA |
4564 | #ifdef CONFIG_COMPAT |
4565 | if (req->ctx->compat) | |
4566 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4567 | #endif | |
93642ef8 | 4568 | return 0; |
aa1fa28f JA |
4569 | } |
4570 | ||
889fca73 | 4571 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4572 | { |
6b754c8b | 4573 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4574 | struct socket *sock; |
7fbb1b54 | 4575 | struct io_buffer *kbuf; |
7a7cacba | 4576 | unsigned flags; |
0031275d | 4577 | int min_ret = 0; |
52de1fe1 | 4578 | int ret, cflags = 0; |
45d189c6 | 4579 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4580 | |
dba4a925 | 4581 | sock = sock_from_file(req->file); |
7a7cacba | 4582 | if (unlikely(!sock)) |
dba4a925 | 4583 | return -ENOTSOCK; |
3529d8c2 | 4584 | |
257e84a5 PB |
4585 | kmsg = req->async_data; |
4586 | if (!kmsg) { | |
7a7cacba PB |
4587 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4588 | if (ret) | |
681fda8d | 4589 | return ret; |
7a7cacba PB |
4590 | kmsg = &iomsg; |
4591 | } | |
03b1230c | 4592 | |
bc02ef33 | 4593 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4594 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4595 | if (IS_ERR(kbuf)) |
52de1fe1 | 4596 | return PTR_ERR(kbuf); |
7a7cacba | 4597 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4598 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4599 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4600 | 1, req->sr_msg.len); |
4601 | } | |
52de1fe1 | 4602 | |
76cd979f | 4603 | flags = req->sr_msg.msg_flags | MSG_NOSIGNAL; |
7a7cacba PB |
4604 | if (flags & MSG_DONTWAIT) |
4605 | req->flags |= REQ_F_NOWAIT; | |
4606 | else if (force_nonblock) | |
4607 | flags |= MSG_DONTWAIT; | |
e47293fd | 4608 | |
0031275d SM |
4609 | if (flags & MSG_WAITALL) |
4610 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4611 | ||
7a7cacba PB |
4612 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4613 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4614 | if (force_nonblock && ret == -EAGAIN) |
4615 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4616 | if (ret == -ERESTARTSYS) |
4617 | ret = -EINTR; | |
03b1230c | 4618 | |
7fbb1b54 PB |
4619 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4620 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4621 | /* fast path, check for non-NULL to avoid function call */ |
4622 | if (kmsg->free_iov) | |
4623 | kfree(kmsg->free_iov); | |
99bc4c38 | 4624 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4625 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
4e88d6e7 | 4626 | req_set_fail_links(req); |
889fca73 | 4627 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4628 | return 0; |
0fa03c62 | 4629 | } |
5d17b4a4 | 4630 | |
889fca73 | 4631 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4632 | { |
6b754c8b | 4633 | struct io_buffer *kbuf; |
7a7cacba PB |
4634 | struct io_sr_msg *sr = &req->sr_msg; |
4635 | struct msghdr msg; | |
4636 | void __user *buf = sr->buf; | |
fddaface | 4637 | struct socket *sock; |
7a7cacba PB |
4638 | struct iovec iov; |
4639 | unsigned flags; | |
0031275d | 4640 | int min_ret = 0; |
bcda7baa | 4641 | int ret, cflags = 0; |
45d189c6 | 4642 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4643 | |
dba4a925 | 4644 | sock = sock_from_file(req->file); |
7a7cacba | 4645 | if (unlikely(!sock)) |
dba4a925 | 4646 | return -ENOTSOCK; |
fddaface | 4647 | |
bc02ef33 | 4648 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4649 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4650 | if (IS_ERR(kbuf)) |
4651 | return PTR_ERR(kbuf); | |
7a7cacba | 4652 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4653 | } |
bcda7baa | 4654 | |
7a7cacba | 4655 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4656 | if (unlikely(ret)) |
4657 | goto out_free; | |
fddaface | 4658 | |
7a7cacba PB |
4659 | msg.msg_name = NULL; |
4660 | msg.msg_control = NULL; | |
4661 | msg.msg_controllen = 0; | |
4662 | msg.msg_namelen = 0; | |
4663 | msg.msg_iocb = NULL; | |
4664 | msg.msg_flags = 0; | |
fddaface | 4665 | |
76cd979f | 4666 | flags = req->sr_msg.msg_flags | MSG_NOSIGNAL; |
7a7cacba PB |
4667 | if (flags & MSG_DONTWAIT) |
4668 | req->flags |= REQ_F_NOWAIT; | |
4669 | else if (force_nonblock) | |
4670 | flags |= MSG_DONTWAIT; | |
4671 | ||
0031275d SM |
4672 | if (flags & MSG_WAITALL) |
4673 | min_ret = iov_iter_count(&msg.msg_iter); | |
4674 | ||
7a7cacba PB |
4675 | ret = sock_recvmsg(sock, &msg, flags); |
4676 | if (force_nonblock && ret == -EAGAIN) | |
4677 | return -EAGAIN; | |
4678 | if (ret == -ERESTARTSYS) | |
4679 | ret = -EINTR; | |
14c32eee | 4680 | out_free: |
7fbb1b54 PB |
4681 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4682 | cflags = io_put_recv_kbuf(req); | |
0031275d | 4683 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
fddaface | 4684 | req_set_fail_links(req); |
889fca73 | 4685 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 4686 | return 0; |
fddaface JA |
4687 | } |
4688 | ||
3529d8c2 | 4689 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4690 | { |
8ed8d3c3 JA |
4691 | struct io_accept *accept = &req->accept; |
4692 | ||
14587a46 | 4693 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4694 | return -EINVAL; |
8042d6ce | 4695 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4696 | return -EINVAL; |
4697 | ||
d55e5f5b JA |
4698 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4699 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4700 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4701 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4702 | return 0; |
8ed8d3c3 | 4703 | } |
17f2fe35 | 4704 | |
889fca73 | 4705 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
4706 | { |
4707 | struct io_accept *accept = &req->accept; | |
45d189c6 | 4708 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 4709 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4710 | int ret; |
4711 | ||
e697deed JX |
4712 | if (req->file->f_flags & O_NONBLOCK) |
4713 | req->flags |= REQ_F_NOWAIT; | |
4714 | ||
8ed8d3c3 | 4715 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4716 | accept->addr_len, accept->flags, |
4717 | accept->nofile); | |
8ed8d3c3 | 4718 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4719 | return -EAGAIN; |
ac45abc0 PB |
4720 | if (ret < 0) { |
4721 | if (ret == -ERESTARTSYS) | |
4722 | ret = -EINTR; | |
4e88d6e7 | 4723 | req_set_fail_links(req); |
ac45abc0 | 4724 | } |
889fca73 | 4725 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 4726 | return 0; |
8ed8d3c3 JA |
4727 | } |
4728 | ||
93642ef8 PB |
4729 | static int io_connect_prep_async(struct io_kiocb *req) |
4730 | { | |
4731 | struct io_async_connect *io = req->async_data; | |
4732 | struct io_connect *conn = &req->connect; | |
4733 | ||
4734 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
4735 | } | |
4736 | ||
3529d8c2 | 4737 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4738 | { |
3529d8c2 | 4739 | struct io_connect *conn = &req->connect; |
f499a021 | 4740 | |
14587a46 | 4741 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4742 | return -EINVAL; |
4743 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4744 | return -EINVAL; | |
4745 | ||
3529d8c2 JA |
4746 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4747 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 4748 | return 0; |
f499a021 JA |
4749 | } |
4750 | ||
889fca73 | 4751 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 4752 | { |
e8c2bc1f | 4753 | struct io_async_connect __io, *io; |
f8e85cf2 | 4754 | unsigned file_flags; |
3fbb51c1 | 4755 | int ret; |
45d189c6 | 4756 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 4757 | |
e8c2bc1f JA |
4758 | if (req->async_data) { |
4759 | io = req->async_data; | |
f499a021 | 4760 | } else { |
3529d8c2 JA |
4761 | ret = move_addr_to_kernel(req->connect.addr, |
4762 | req->connect.addr_len, | |
e8c2bc1f | 4763 | &__io.address); |
f499a021 JA |
4764 | if (ret) |
4765 | goto out; | |
4766 | io = &__io; | |
4767 | } | |
4768 | ||
3fbb51c1 JA |
4769 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4770 | ||
e8c2bc1f | 4771 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4772 | req->connect.addr_len, file_flags); |
87f80d62 | 4773 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4774 | if (req->async_data) |
b7bb4f7d | 4775 | return -EAGAIN; |
e8c2bc1f | 4776 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4777 | ret = -ENOMEM; |
4778 | goto out; | |
4779 | } | |
e8c2bc1f | 4780 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 4781 | return -EAGAIN; |
f499a021 | 4782 | } |
f8e85cf2 JA |
4783 | if (ret == -ERESTARTSYS) |
4784 | ret = -EINTR; | |
f499a021 | 4785 | out: |
4e88d6e7 JA |
4786 | if (ret < 0) |
4787 | req_set_fail_links(req); | |
889fca73 | 4788 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 4789 | return 0; |
469956e8 Y |
4790 | } |
4791 | #else /* !CONFIG_NET */ | |
99a10081 JA |
4792 | #define IO_NETOP_FN(op) \ |
4793 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
4794 | { \ | |
4795 | return -EOPNOTSUPP; \ | |
4796 | } | |
4797 | ||
4798 | #define IO_NETOP_PREP(op) \ | |
4799 | IO_NETOP_FN(op) \ | |
4800 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
4801 | { \ | |
4802 | return -EOPNOTSUPP; \ | |
4803 | } \ | |
4804 | ||
4805 | #define IO_NETOP_PREP_ASYNC(op) \ | |
4806 | IO_NETOP_PREP(op) \ | |
4807 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
4808 | { \ | |
4809 | return -EOPNOTSUPP; \ | |
4810 | } | |
4811 | ||
4812 | IO_NETOP_PREP_ASYNC(sendmsg); | |
4813 | IO_NETOP_PREP_ASYNC(recvmsg); | |
4814 | IO_NETOP_PREP_ASYNC(connect); | |
4815 | IO_NETOP_PREP(accept); | |
4816 | IO_NETOP_FN(send); | |
4817 | IO_NETOP_FN(recv); | |
469956e8 | 4818 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4819 | |
d7718a9d JA |
4820 | struct io_poll_table { |
4821 | struct poll_table_struct pt; | |
4822 | struct io_kiocb *req; | |
4823 | int error; | |
4824 | }; | |
ce593a6c | 4825 | |
d7718a9d JA |
4826 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4827 | __poll_t mask, task_work_func_t func) | |
4828 | { | |
aa96bf8a | 4829 | int ret; |
d7718a9d JA |
4830 | |
4831 | /* for instances that support it check for an event match first: */ | |
4832 | if (mask && !(mask & poll->events)) | |
4833 | return 0; | |
4834 | ||
4835 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4836 | ||
4837 | list_del_init(&poll->wait.entry); | |
4838 | ||
d7718a9d | 4839 | req->result = mask; |
7cbf1722 | 4840 | req->task_work.func = func; |
6d816e08 | 4841 | |
d7718a9d | 4842 | /* |
e3aabf95 JA |
4843 | * If this fails, then the task is exiting. When a task exits, the |
4844 | * work gets canceled, so just cancel this request as well instead | |
4845 | * of executing it. We can't safely execute it anyway, as we may not | |
4846 | * have the needed state needed for it anyway. | |
d7718a9d | 4847 | */ |
355fb9e2 | 4848 | ret = io_req_task_work_add(req); |
aa96bf8a | 4849 | if (unlikely(ret)) { |
e3aabf95 | 4850 | WRITE_ONCE(poll->canceled, true); |
eab30c4d | 4851 | io_req_task_work_add_fallback(req, func); |
aa96bf8a | 4852 | } |
d7718a9d JA |
4853 | return 1; |
4854 | } | |
4855 | ||
74ce6ce4 JA |
4856 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4857 | __acquires(&req->ctx->completion_lock) | |
4858 | { | |
4859 | struct io_ring_ctx *ctx = req->ctx; | |
4860 | ||
4861 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4862 | struct poll_table_struct pt = { ._key = poll->events }; | |
4863 | ||
4864 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4865 | } | |
4866 | ||
4867 | spin_lock_irq(&ctx->completion_lock); | |
4868 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4869 | add_wait_queue(poll->head, &poll->wait); | |
4870 | return true; | |
4871 | } | |
4872 | ||
4873 | return false; | |
4874 | } | |
4875 | ||
d4e7cd36 | 4876 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4877 | { |
e8c2bc1f | 4878 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 4879 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 4880 | return req->async_data; |
d4e7cd36 JA |
4881 | return req->apoll->double_poll; |
4882 | } | |
4883 | ||
4884 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4885 | { | |
4886 | if (req->opcode == IORING_OP_POLL_ADD) | |
4887 | return &req->poll; | |
4888 | return &req->apoll->poll; | |
4889 | } | |
4890 | ||
4891 | static void io_poll_remove_double(struct io_kiocb *req) | |
4892 | { | |
4893 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4894 | |
4895 | lockdep_assert_held(&req->ctx->completion_lock); | |
4896 | ||
4897 | if (poll && poll->head) { | |
4898 | struct wait_queue_head *head = poll->head; | |
4899 | ||
4900 | spin_lock(&head->lock); | |
4901 | list_del_init(&poll->wait.entry); | |
4902 | if (poll->wait.private) | |
de9b4cca | 4903 | req_ref_put(req); |
18bceab1 JA |
4904 | poll->head = NULL; |
4905 | spin_unlock(&head->lock); | |
4906 | } | |
4907 | } | |
4908 | ||
4909 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4910 | { | |
4911 | struct io_ring_ctx *ctx = req->ctx; | |
4912 | ||
45ab03b1 JA |
4913 | if (!error && req->poll.canceled) |
4914 | error = -ECANCELED; | |
4915 | ||
d4e7cd36 | 4916 | io_poll_remove_double(req); |
18bceab1 JA |
4917 | req->poll.done = true; |
4918 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4919 | io_commit_cqring(ctx); | |
4920 | } | |
4921 | ||
dd221f46 | 4922 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 4923 | { |
dd221f46 | 4924 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 4925 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 4926 | struct io_kiocb *nxt; |
18bceab1 JA |
4927 | |
4928 | if (io_poll_rewait(req, &req->poll)) { | |
4929 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
4930 | } else { |
4931 | hash_del(&req->hash_node); | |
4932 | io_poll_complete(req, req->result, 0); | |
4933 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 4934 | |
dd221f46 PB |
4935 | nxt = io_put_req_find_next(req); |
4936 | io_cqring_ev_posted(ctx); | |
4937 | if (nxt) | |
4938 | __io_req_task_submit(nxt); | |
4939 | } | |
18bceab1 JA |
4940 | } |
4941 | ||
4942 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4943 | int sync, void *key) | |
4944 | { | |
4945 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4946 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4947 | __poll_t mask = key_to_poll(key); |
4948 | ||
4949 | /* for instances that support it check for an event match first: */ | |
4950 | if (mask && !(mask & poll->events)) | |
4951 | return 0; | |
4952 | ||
8706e04e JA |
4953 | list_del_init(&wait->entry); |
4954 | ||
807abcb0 | 4955 | if (poll && poll->head) { |
18bceab1 JA |
4956 | bool done; |
4957 | ||
807abcb0 JA |
4958 | spin_lock(&poll->head->lock); |
4959 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4960 | if (!done) |
807abcb0 | 4961 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
4962 | /* make sure double remove sees this as being gone */ |
4963 | wait->private = NULL; | |
807abcb0 | 4964 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
4965 | if (!done) { |
4966 | /* use wait func handler, so it matches the rq type */ | |
4967 | poll->wait.func(&poll->wait, mode, sync, key); | |
4968 | } | |
18bceab1 | 4969 | } |
de9b4cca | 4970 | req_ref_put(req); |
18bceab1 JA |
4971 | return 1; |
4972 | } | |
4973 | ||
4974 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4975 | wait_queue_func_t wake_func) | |
4976 | { | |
4977 | poll->head = NULL; | |
4978 | poll->done = false; | |
4979 | poll->canceled = false; | |
464dca61 JA |
4980 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
4981 | /* mask in events that we always want/need */ | |
4982 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
4983 | INIT_LIST_HEAD(&poll->wait.entry); |
4984 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4985 | } | |
4986 | ||
4987 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4988 | struct wait_queue_head *head, |
4989 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4990 | { |
4991 | struct io_kiocb *req = pt->req; | |
4992 | ||
4993 | /* | |
4994 | * If poll->head is already set, it's because the file being polled | |
4995 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4996 | * for write). Setup a separate io_poll_iocb if this happens. | |
4997 | */ | |
4998 | if (unlikely(poll->head)) { | |
58852d4d PB |
4999 | struct io_poll_iocb *poll_one = poll; |
5000 | ||
18bceab1 | 5001 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5002 | if (*poll_ptr) { |
18bceab1 JA |
5003 | pt->error = -EINVAL; |
5004 | return; | |
5005 | } | |
1c3b3e65 JA |
5006 | /* double add on the same waitqueue head, ignore */ |
5007 | if (poll->head == head) | |
5008 | return; | |
18bceab1 JA |
5009 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5010 | if (!poll) { | |
5011 | pt->error = -ENOMEM; | |
5012 | return; | |
5013 | } | |
58852d4d | 5014 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5015 | req_ref_get(req); |
18bceab1 | 5016 | poll->wait.private = req; |
807abcb0 | 5017 | *poll_ptr = poll; |
18bceab1 JA |
5018 | } |
5019 | ||
5020 | pt->error = 0; | |
5021 | poll->head = head; | |
a31eb4a2 JX |
5022 | |
5023 | if (poll->events & EPOLLEXCLUSIVE) | |
5024 | add_wait_queue_exclusive(head, &poll->wait); | |
5025 | else | |
5026 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5027 | } |
5028 | ||
5029 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5030 | struct poll_table_struct *p) | |
5031 | { | |
5032 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5033 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5034 | |
807abcb0 | 5035 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5036 | } |
5037 | ||
d7718a9d JA |
5038 | static void io_async_task_func(struct callback_head *cb) |
5039 | { | |
5040 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5041 | struct async_poll *apoll = req->apoll; | |
5042 | struct io_ring_ctx *ctx = req->ctx; | |
5043 | ||
5044 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5045 | ||
74ce6ce4 | 5046 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5047 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 5048 | return; |
d7718a9d JA |
5049 | } |
5050 | ||
31067255 | 5051 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5052 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5053 | hash_del(&req->hash_node); |
2bae047e | 5054 | |
d4e7cd36 | 5055 | io_poll_remove_double(req); |
74ce6ce4 JA |
5056 | spin_unlock_irq(&ctx->completion_lock); |
5057 | ||
0be0b0e3 PB |
5058 | if (!READ_ONCE(apoll->poll.canceled)) |
5059 | __io_req_task_submit(req); | |
5060 | else | |
2593553a | 5061 | io_req_complete_failed(req, -ECANCELED); |
aa340845 | 5062 | |
807abcb0 | 5063 | kfree(apoll->double_poll); |
31067255 | 5064 | kfree(apoll); |
d7718a9d JA |
5065 | } |
5066 | ||
5067 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5068 | void *key) | |
5069 | { | |
5070 | struct io_kiocb *req = wait->private; | |
5071 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5072 | ||
5073 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5074 | key_to_poll(key)); | |
5075 | ||
5076 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5077 | } | |
5078 | ||
5079 | static void io_poll_req_insert(struct io_kiocb *req) | |
5080 | { | |
5081 | struct io_ring_ctx *ctx = req->ctx; | |
5082 | struct hlist_head *list; | |
5083 | ||
5084 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5085 | hlist_add_head(&req->hash_node, list); | |
5086 | } | |
5087 | ||
5088 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5089 | struct io_poll_iocb *poll, | |
5090 | struct io_poll_table *ipt, __poll_t mask, | |
5091 | wait_queue_func_t wake_func) | |
5092 | __acquires(&ctx->completion_lock) | |
5093 | { | |
5094 | struct io_ring_ctx *ctx = req->ctx; | |
5095 | bool cancel = false; | |
5096 | ||
4d52f338 | 5097 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5098 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5099 | poll->file = req->file; |
18bceab1 | 5100 | poll->wait.private = req; |
d7718a9d JA |
5101 | |
5102 | ipt->pt._key = mask; | |
5103 | ipt->req = req; | |
5104 | ipt->error = -EINVAL; | |
5105 | ||
d7718a9d JA |
5106 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5107 | ||
5108 | spin_lock_irq(&ctx->completion_lock); | |
5109 | if (likely(poll->head)) { | |
5110 | spin_lock(&poll->head->lock); | |
5111 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5112 | if (ipt->error) | |
5113 | cancel = true; | |
5114 | ipt->error = 0; | |
5115 | mask = 0; | |
5116 | } | |
5117 | if (mask || ipt->error) | |
5118 | list_del_init(&poll->wait.entry); | |
5119 | else if (cancel) | |
5120 | WRITE_ONCE(poll->canceled, true); | |
5121 | else if (!poll->done) /* actually waiting for an event */ | |
5122 | io_poll_req_insert(req); | |
5123 | spin_unlock(&poll->head->lock); | |
5124 | } | |
5125 | ||
5126 | return mask; | |
5127 | } | |
5128 | ||
5129 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5130 | { | |
5131 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5132 | struct io_ring_ctx *ctx = req->ctx; | |
5133 | struct async_poll *apoll; | |
5134 | struct io_poll_table ipt; | |
5135 | __poll_t mask, ret; | |
9dab14b8 | 5136 | int rw; |
d7718a9d JA |
5137 | |
5138 | if (!req->file || !file_can_poll(req->file)) | |
5139 | return false; | |
24c74678 | 5140 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5141 | return false; |
9dab14b8 JA |
5142 | if (def->pollin) |
5143 | rw = READ; | |
5144 | else if (def->pollout) | |
5145 | rw = WRITE; | |
5146 | else | |
5147 | return false; | |
5148 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
7b29f92d | 5149 | if (!io_file_supports_async(req, rw)) |
d7718a9d JA |
5150 | return false; |
5151 | ||
5152 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5153 | if (unlikely(!apoll)) | |
5154 | return false; | |
807abcb0 | 5155 | apoll->double_poll = NULL; |
d7718a9d JA |
5156 | |
5157 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5158 | req->apoll = apoll; |
d7718a9d | 5159 | |
8755d97a | 5160 | mask = 0; |
d7718a9d | 5161 | if (def->pollin) |
8755d97a | 5162 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5163 | if (def->pollout) |
5164 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5165 | |
5166 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5167 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5168 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5169 | mask &= ~POLLIN; | |
5170 | ||
d7718a9d JA |
5171 | mask |= POLLERR | POLLPRI; |
5172 | ||
5173 | ipt.pt._qproc = io_async_queue_proc; | |
5174 | ||
5175 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5176 | io_async_wake); | |
a36da65c | 5177 | if (ret || ipt.error) { |
d4e7cd36 | 5178 | io_poll_remove_double(req); |
d7718a9d | 5179 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5180 | kfree(apoll->double_poll); |
d7718a9d JA |
5181 | kfree(apoll); |
5182 | return false; | |
5183 | } | |
5184 | spin_unlock_irq(&ctx->completion_lock); | |
5185 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5186 | apoll->poll.events); | |
5187 | return true; | |
5188 | } | |
5189 | ||
5190 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5191 | struct io_poll_iocb *poll) | |
221c5eb2 | 5192 | { |
b41e9852 | 5193 | bool do_complete = false; |
221c5eb2 JA |
5194 | |
5195 | spin_lock(&poll->head->lock); | |
5196 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5197 | if (!list_empty(&poll->wait.entry)) { |
5198 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5199 | do_complete = true; |
221c5eb2 JA |
5200 | } |
5201 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5202 | hash_del(&req->hash_node); |
d7718a9d JA |
5203 | return do_complete; |
5204 | } | |
5205 | ||
5206 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5207 | { | |
5208 | bool do_complete; | |
5209 | ||
d4e7cd36 JA |
5210 | io_poll_remove_double(req); |
5211 | ||
d7718a9d JA |
5212 | if (req->opcode == IORING_OP_POLL_ADD) { |
5213 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5214 | } else { | |
3bfa5bcb JA |
5215 | struct async_poll *apoll = req->apoll; |
5216 | ||
d7718a9d | 5217 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5218 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5219 | if (do_complete) { | |
d7718a9d | 5220 | io_put_req(req); |
807abcb0 | 5221 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5222 | kfree(apoll); |
5223 | } | |
b1f573bd XW |
5224 | } |
5225 | ||
b41e9852 JA |
5226 | if (do_complete) { |
5227 | io_cqring_fill_event(req, -ECANCELED); | |
5228 | io_commit_cqring(req->ctx); | |
f254ac04 | 5229 | req_set_fail_links(req); |
216578e5 | 5230 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5231 | } |
5232 | ||
5233 | return do_complete; | |
221c5eb2 JA |
5234 | } |
5235 | ||
76e1b642 JA |
5236 | /* |
5237 | * Returns true if we found and killed one or more poll requests | |
5238 | */ | |
6b81928d PB |
5239 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5240 | struct files_struct *files) | |
221c5eb2 | 5241 | { |
78076bb6 | 5242 | struct hlist_node *tmp; |
221c5eb2 | 5243 | struct io_kiocb *req; |
8e2e1faf | 5244 | int posted = 0, i; |
221c5eb2 JA |
5245 | |
5246 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5247 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5248 | struct hlist_head *list; | |
5249 | ||
5250 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5251 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5252 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5253 | posted += io_poll_remove_one(req); |
5254 | } | |
221c5eb2 JA |
5255 | } |
5256 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5257 | |
8e2e1faf JA |
5258 | if (posted) |
5259 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5260 | |
5261 | return posted != 0; | |
221c5eb2 JA |
5262 | } |
5263 | ||
47f46768 JA |
5264 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5265 | { | |
78076bb6 | 5266 | struct hlist_head *list; |
47f46768 JA |
5267 | struct io_kiocb *req; |
5268 | ||
78076bb6 JA |
5269 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5270 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5271 | if (sqe_addr != req->user_data) |
5272 | continue; | |
5273 | if (io_poll_remove_one(req)) | |
eac406c6 | 5274 | return 0; |
b41e9852 | 5275 | return -EALREADY; |
47f46768 JA |
5276 | } |
5277 | ||
5278 | return -ENOENT; | |
5279 | } | |
5280 | ||
3529d8c2 JA |
5281 | static int io_poll_remove_prep(struct io_kiocb *req, |
5282 | const struct io_uring_sqe *sqe) | |
0969e783 | 5283 | { |
0969e783 JA |
5284 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5285 | return -EINVAL; | |
5286 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5287 | sqe->poll_events) | |
5288 | return -EINVAL; | |
5289 | ||
018043be | 5290 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5291 | return 0; |
5292 | } | |
5293 | ||
221c5eb2 JA |
5294 | /* |
5295 | * Find a running poll command that matches one specified in sqe->addr, | |
5296 | * and remove it if found. | |
5297 | */ | |
61e98203 | 5298 | static int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) |
221c5eb2 JA |
5299 | { |
5300 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5301 | int ret; |
221c5eb2 | 5302 | |
221c5eb2 | 5303 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5304 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5305 | spin_unlock_irq(&ctx->completion_lock); |
5306 | ||
4e88d6e7 JA |
5307 | if (ret < 0) |
5308 | req_set_fail_links(req); | |
e1e16097 | 5309 | io_req_complete(req, ret); |
221c5eb2 JA |
5310 | return 0; |
5311 | } | |
5312 | ||
221c5eb2 JA |
5313 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5314 | void *key) | |
5315 | { | |
c2f2eb7d JA |
5316 | struct io_kiocb *req = wait->private; |
5317 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5318 | |
d7718a9d | 5319 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5320 | } |
5321 | ||
221c5eb2 JA |
5322 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5323 | struct poll_table_struct *p) | |
5324 | { | |
5325 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5326 | ||
e8c2bc1f | 5327 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5328 | } |
5329 | ||
3529d8c2 | 5330 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5331 | { |
5332 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5333 | u32 events; |
221c5eb2 JA |
5334 | |
5335 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5336 | return -EINVAL; | |
5337 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5338 | return -EINVAL; | |
5339 | ||
5769a351 JX |
5340 | events = READ_ONCE(sqe->poll32_events); |
5341 | #ifdef __BIG_ENDIAN | |
5342 | events = swahw32(events); | |
5343 | #endif | |
464dca61 | 5344 | poll->events = demangle_poll(events) | (events & EPOLLEXCLUSIVE); |
0969e783 JA |
5345 | return 0; |
5346 | } | |
5347 | ||
61e98203 | 5348 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5349 | { |
5350 | struct io_poll_iocb *poll = &req->poll; | |
5351 | struct io_ring_ctx *ctx = req->ctx; | |
5352 | struct io_poll_table ipt; | |
0969e783 | 5353 | __poll_t mask; |
0969e783 | 5354 | |
d7718a9d | 5355 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5356 | |
d7718a9d JA |
5357 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5358 | io_poll_wake); | |
221c5eb2 | 5359 | |
8c838788 | 5360 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5361 | ipt.error = 0; |
b0dd8a41 | 5362 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5363 | } |
221c5eb2 JA |
5364 | spin_unlock_irq(&ctx->completion_lock); |
5365 | ||
8c838788 JA |
5366 | if (mask) { |
5367 | io_cqring_ev_posted(ctx); | |
014db007 | 5368 | io_put_req(req); |
221c5eb2 | 5369 | } |
8c838788 | 5370 | return ipt.error; |
221c5eb2 JA |
5371 | } |
5372 | ||
5262f567 JA |
5373 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5374 | { | |
ad8a48ac JA |
5375 | struct io_timeout_data *data = container_of(timer, |
5376 | struct io_timeout_data, timer); | |
5377 | struct io_kiocb *req = data->req; | |
5378 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5379 | unsigned long flags; |
5380 | ||
5262f567 | 5381 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5382 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5383 | atomic_set(&req->ctx->cq_timeouts, |
5384 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5385 | ||
78e19bbe | 5386 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5387 | io_commit_cqring(ctx); |
5388 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5389 | ||
5390 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5391 | req_set_fail_links(req); |
5262f567 JA |
5392 | io_put_req(req); |
5393 | return HRTIMER_NORESTART; | |
5394 | } | |
5395 | ||
fbd15848 PB |
5396 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5397 | __u64 user_data) | |
f254ac04 | 5398 | { |
fbd15848 | 5399 | struct io_timeout_data *io; |
47f46768 JA |
5400 | struct io_kiocb *req; |
5401 | int ret = -ENOENT; | |
f254ac04 | 5402 | |
135fcde8 | 5403 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5404 | if (user_data == req->user_data) { |
47f46768 JA |
5405 | ret = 0; |
5406 | break; | |
5407 | } | |
5408 | } | |
5409 | ||
5410 | if (ret == -ENOENT) | |
fbd15848 PB |
5411 | return ERR_PTR(ret); |
5412 | ||
5413 | io = req->async_data; | |
e8c2bc1f | 5414 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 | 5415 | if (ret == -1) |
fbd15848 | 5416 | return ERR_PTR(-EALREADY); |
a71976f3 | 5417 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5418 | return req; |
5419 | } | |
47f46768 | 5420 | |
fbd15848 PB |
5421 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5422 | { | |
5423 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5424 | ||
5425 | if (IS_ERR(req)) | |
5426 | return PTR_ERR(req); | |
f254ac04 JA |
5427 | |
5428 | req_set_fail_links(req); | |
f254ac04 | 5429 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5430 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5431 | return 0; |
5432 | } | |
5433 | ||
9c8e11b3 PB |
5434 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5435 | struct timespec64 *ts, enum hrtimer_mode mode) | |
47f46768 | 5436 | { |
9c8e11b3 PB |
5437 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5438 | struct io_timeout_data *data; | |
47f46768 | 5439 | |
9c8e11b3 PB |
5440 | if (IS_ERR(req)) |
5441 | return PTR_ERR(req); | |
47f46768 | 5442 | |
9c8e11b3 PB |
5443 | req->timeout.off = 0; /* noseq */ |
5444 | data = req->async_data; | |
5445 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5446 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5447 | data->timer.function = io_timeout_fn; | |
5448 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5449 | return 0; | |
47f46768 JA |
5450 | } |
5451 | ||
3529d8c2 JA |
5452 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5453 | const struct io_uring_sqe *sqe) | |
b29472ee | 5454 | { |
9c8e11b3 PB |
5455 | struct io_timeout_rem *tr = &req->timeout_rem; |
5456 | ||
b29472ee JA |
5457 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5458 | return -EINVAL; | |
61710e43 DA |
5459 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5460 | return -EINVAL; | |
9c8e11b3 | 5461 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5462 | return -EINVAL; |
5463 | ||
9c8e11b3 PB |
5464 | tr->addr = READ_ONCE(sqe->addr); |
5465 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5466 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5467 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5468 | return -EINVAL; | |
5469 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5470 | return -EFAULT; | |
5471 | } else if (tr->flags) { | |
5472 | /* timeout removal doesn't support flags */ | |
b29472ee | 5473 | return -EINVAL; |
9c8e11b3 | 5474 | } |
b29472ee | 5475 | |
b29472ee JA |
5476 | return 0; |
5477 | } | |
5478 | ||
8662daec PB |
5479 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5480 | { | |
5481 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5482 | : HRTIMER_MODE_REL; | |
5483 | } | |
5484 | ||
11365043 JA |
5485 | /* |
5486 | * Remove or update an existing timeout command | |
5487 | */ | |
61e98203 | 5488 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5489 | { |
9c8e11b3 | 5490 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5491 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5492 | int ret; |
11365043 | 5493 | |
11365043 | 5494 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5495 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5496 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5497 | else |
5498 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5499 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5500 | |
47f46768 | 5501 | io_cqring_fill_event(req, ret); |
11365043 JA |
5502 | io_commit_cqring(ctx); |
5503 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5504 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5505 | if (ret < 0) |
5506 | req_set_fail_links(req); | |
ec9c02ad | 5507 | io_put_req(req); |
11365043 | 5508 | return 0; |
5262f567 JA |
5509 | } |
5510 | ||
3529d8c2 | 5511 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5512 | bool is_timeout_link) |
5262f567 | 5513 | { |
ad8a48ac | 5514 | struct io_timeout_data *data; |
a41525ab | 5515 | unsigned flags; |
56080b02 | 5516 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5517 | |
ad8a48ac | 5518 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5519 | return -EINVAL; |
ad8a48ac | 5520 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5521 | return -EINVAL; |
56080b02 | 5522 | if (off && is_timeout_link) |
2d28390a | 5523 | return -EINVAL; |
a41525ab JA |
5524 | flags = READ_ONCE(sqe->timeout_flags); |
5525 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5526 | return -EINVAL; |
bdf20073 | 5527 | |
bfe68a22 | 5528 | req->timeout.off = off; |
26a61679 | 5529 | |
e8c2bc1f | 5530 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5531 | return -ENOMEM; |
5532 | ||
e8c2bc1f | 5533 | data = req->async_data; |
ad8a48ac | 5534 | data->req = req; |
ad8a48ac JA |
5535 | |
5536 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5537 | return -EFAULT; |
5538 | ||
8662daec | 5539 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac | 5540 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
2482b58f PB |
5541 | if (is_timeout_link) |
5542 | io_req_track_inflight(req); | |
ad8a48ac JA |
5543 | return 0; |
5544 | } | |
5545 | ||
61e98203 | 5546 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5547 | { |
ad8a48ac | 5548 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5549 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5550 | struct list_head *entry; |
bfe68a22 | 5551 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5552 | |
733f5c95 | 5553 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5554 | |
5262f567 JA |
5555 | /* |
5556 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5557 | * timeout event to be satisfied. If it isn't set, then this is |
5558 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5559 | */ |
8eb7e2d0 | 5560 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5561 | entry = ctx->timeout_list.prev; |
5562 | goto add; | |
5563 | } | |
5262f567 | 5564 | |
bfe68a22 PB |
5565 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5566 | req->timeout.target_seq = tail + off; | |
5262f567 | 5567 | |
f010505b MDG |
5568 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5569 | * This is safe because ->completion_lock is held, and submissions | |
5570 | * and completions are never mixed in the same ->completion_lock section. | |
5571 | */ | |
5572 | ctx->cq_last_tm_flush = tail; | |
5573 | ||
5262f567 JA |
5574 | /* |
5575 | * Insertion sort, ensuring the first entry in the list is always | |
5576 | * the one we need first. | |
5577 | */ | |
5262f567 | 5578 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5579 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5580 | timeout.list); | |
5262f567 | 5581 | |
8eb7e2d0 | 5582 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5583 | continue; |
bfe68a22 PB |
5584 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5585 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5586 | break; |
5587 | } | |
93bd25bb | 5588 | add: |
135fcde8 | 5589 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5590 | data->timer.function = io_timeout_fn; |
5591 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5592 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5593 | return 0; |
5594 | } | |
5262f567 | 5595 | |
f458dd84 PB |
5596 | struct io_cancel_data { |
5597 | struct io_ring_ctx *ctx; | |
5598 | u64 user_data; | |
5599 | }; | |
5600 | ||
62755e35 JA |
5601 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5602 | { | |
5603 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 5604 | struct io_cancel_data *cd = data; |
62755e35 | 5605 | |
f458dd84 | 5606 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
5607 | } |
5608 | ||
f458dd84 PB |
5609 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
5610 | struct io_ring_ctx *ctx) | |
62755e35 | 5611 | { |
f458dd84 | 5612 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 5613 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5614 | int ret = 0; |
5615 | ||
f458dd84 | 5616 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
5617 | return -ENOENT; |
5618 | ||
f458dd84 | 5619 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
5620 | switch (cancel_ret) { |
5621 | case IO_WQ_CANCEL_OK: | |
5622 | ret = 0; | |
5623 | break; | |
5624 | case IO_WQ_CANCEL_RUNNING: | |
5625 | ret = -EALREADY; | |
5626 | break; | |
5627 | case IO_WQ_CANCEL_NOTFOUND: | |
5628 | ret = -ENOENT; | |
5629 | break; | |
5630 | } | |
5631 | ||
e977d6d3 JA |
5632 | return ret; |
5633 | } | |
5634 | ||
47f46768 JA |
5635 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5636 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5637 | int success_ret) |
47f46768 JA |
5638 | { |
5639 | unsigned long flags; | |
5640 | int ret; | |
5641 | ||
f458dd84 | 5642 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
47f46768 JA |
5643 | if (ret != -ENOENT) { |
5644 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5645 | goto done; | |
5646 | } | |
5647 | ||
5648 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5649 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5650 | if (ret != -ENOENT) | |
5651 | goto done; | |
5652 | ret = io_poll_cancel(ctx, sqe_addr); | |
5653 | done: | |
b0dd8a41 JA |
5654 | if (!ret) |
5655 | ret = success_ret; | |
47f46768 JA |
5656 | io_cqring_fill_event(req, ret); |
5657 | io_commit_cqring(ctx); | |
5658 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5659 | io_cqring_ev_posted(ctx); | |
5660 | ||
4e88d6e7 JA |
5661 | if (ret < 0) |
5662 | req_set_fail_links(req); | |
014db007 | 5663 | io_put_req(req); |
47f46768 JA |
5664 | } |
5665 | ||
3529d8c2 JA |
5666 | static int io_async_cancel_prep(struct io_kiocb *req, |
5667 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5668 | { |
fbf23849 | 5669 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5670 | return -EINVAL; |
61710e43 DA |
5671 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5672 | return -EINVAL; | |
5673 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5674 | return -EINVAL; |
5675 | ||
fbf23849 JA |
5676 | req->cancel.addr = READ_ONCE(sqe->addr); |
5677 | return 0; | |
5678 | } | |
5679 | ||
61e98203 | 5680 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5681 | { |
5682 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
5683 | u64 sqe_addr = req->cancel.addr; |
5684 | struct io_tctx_node *node; | |
5685 | int ret; | |
5686 | ||
5687 | /* tasks should wait for their io-wq threads, so safe w/o sync */ | |
5688 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); | |
5689 | spin_lock_irq(&ctx->completion_lock); | |
5690 | if (ret != -ENOENT) | |
5691 | goto done; | |
5692 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5693 | if (ret != -ENOENT) | |
5694 | goto done; | |
5695 | ret = io_poll_cancel(ctx, sqe_addr); | |
5696 | if (ret != -ENOENT) | |
5697 | goto done; | |
5698 | spin_unlock_irq(&ctx->completion_lock); | |
5699 | ||
5700 | /* slow path, try all io-wq's */ | |
5701 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5702 | ret = -ENOENT; | |
5703 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
5704 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 5705 | |
58f99373 PB |
5706 | if (!tctx || !tctx->io_wq) |
5707 | continue; | |
5708 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); | |
5709 | if (ret != -ENOENT) | |
5710 | break; | |
5711 | } | |
5712 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5713 | ||
5714 | spin_lock_irq(&ctx->completion_lock); | |
5715 | done: | |
5716 | io_cqring_fill_event(req, ret); | |
5717 | io_commit_cqring(ctx); | |
5718 | spin_unlock_irq(&ctx->completion_lock); | |
5719 | io_cqring_ev_posted(ctx); | |
5720 | ||
5721 | if (ret < 0) | |
5722 | req_set_fail_links(req); | |
5723 | io_put_req(req); | |
5262f567 JA |
5724 | return 0; |
5725 | } | |
5726 | ||
269bbe5f | 5727 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
5728 | const struct io_uring_sqe *sqe) |
5729 | { | |
6ca56f84 JA |
5730 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5731 | return -EINVAL; | |
61710e43 DA |
5732 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5733 | return -EINVAL; | |
5734 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5735 | return -EINVAL; |
5736 | ||
269bbe5f BM |
5737 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
5738 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
5739 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 5740 | return -EINVAL; |
269bbe5f | 5741 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
5742 | return 0; |
5743 | } | |
5744 | ||
889fca73 | 5745 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5746 | { |
5747 | struct io_ring_ctx *ctx = req->ctx; | |
269bbe5f | 5748 | struct io_uring_rsrc_update up; |
05f3fb3c | 5749 | int ret; |
fbf23849 | 5750 | |
45d189c6 | 5751 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 5752 | return -EAGAIN; |
05f3fb3c | 5753 | |
269bbe5f BM |
5754 | up.offset = req->rsrc_update.offset; |
5755 | up.data = req->rsrc_update.arg; | |
05f3fb3c JA |
5756 | |
5757 | mutex_lock(&ctx->uring_lock); | |
269bbe5f | 5758 | ret = __io_sqe_files_update(ctx, &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
5759 | mutex_unlock(&ctx->uring_lock); |
5760 | ||
5761 | if (ret < 0) | |
5762 | req_set_fail_links(req); | |
889fca73 | 5763 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
5764 | return 0; |
5765 | } | |
5766 | ||
bfe76559 | 5767 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5768 | { |
d625c6ee | 5769 | switch (req->opcode) { |
e781573e | 5770 | case IORING_OP_NOP: |
bfe76559 | 5771 | return 0; |
f67676d1 JA |
5772 | case IORING_OP_READV: |
5773 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5774 | case IORING_OP_READ: |
bfe76559 | 5775 | return io_read_prep(req, sqe); |
f67676d1 JA |
5776 | case IORING_OP_WRITEV: |
5777 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5778 | case IORING_OP_WRITE: |
bfe76559 | 5779 | return io_write_prep(req, sqe); |
0969e783 | 5780 | case IORING_OP_POLL_ADD: |
bfe76559 | 5781 | return io_poll_add_prep(req, sqe); |
0969e783 | 5782 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5783 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5784 | case IORING_OP_FSYNC: |
1155c76a | 5785 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 5786 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 5787 | return io_sfr_prep(req, sqe); |
03b1230c | 5788 | case IORING_OP_SENDMSG: |
fddaface | 5789 | case IORING_OP_SEND: |
bfe76559 | 5790 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5791 | case IORING_OP_RECVMSG: |
fddaface | 5792 | case IORING_OP_RECV: |
bfe76559 | 5793 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5794 | case IORING_OP_CONNECT: |
bfe76559 | 5795 | return io_connect_prep(req, sqe); |
2d28390a | 5796 | case IORING_OP_TIMEOUT: |
bfe76559 | 5797 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5798 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5799 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5800 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5801 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5802 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5803 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5804 | case IORING_OP_ACCEPT: |
bfe76559 | 5805 | return io_accept_prep(req, sqe); |
d63d1b5e | 5806 | case IORING_OP_FALLOCATE: |
bfe76559 | 5807 | return io_fallocate_prep(req, sqe); |
15b71abe | 5808 | case IORING_OP_OPENAT: |
bfe76559 | 5809 | return io_openat_prep(req, sqe); |
b5dba59e | 5810 | case IORING_OP_CLOSE: |
bfe76559 | 5811 | return io_close_prep(req, sqe); |
05f3fb3c | 5812 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 5813 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 5814 | case IORING_OP_STATX: |
bfe76559 | 5815 | return io_statx_prep(req, sqe); |
4840e418 | 5816 | case IORING_OP_FADVISE: |
bfe76559 | 5817 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5818 | case IORING_OP_MADVISE: |
bfe76559 | 5819 | return io_madvise_prep(req, sqe); |
cebdb986 | 5820 | case IORING_OP_OPENAT2: |
bfe76559 | 5821 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5822 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5823 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5824 | case IORING_OP_SPLICE: |
bfe76559 | 5825 | return io_splice_prep(req, sqe); |
ddf0322d | 5826 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5827 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5828 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5829 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5830 | case IORING_OP_TEE: |
bfe76559 | 5831 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5832 | case IORING_OP_SHUTDOWN: |
5833 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5834 | case IORING_OP_RENAMEAT: |
5835 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5836 | case IORING_OP_UNLINKAT: |
5837 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5838 | } |
5839 | ||
bfe76559 PB |
5840 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5841 | req->opcode); | |
5842 | return-EINVAL; | |
5843 | } | |
5844 | ||
93642ef8 | 5845 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 5846 | { |
b7e298d2 PB |
5847 | if (!io_op_defs[req->opcode].needs_async_setup) |
5848 | return 0; | |
5849 | if (WARN_ON_ONCE(req->async_data)) | |
5850 | return -EFAULT; | |
5851 | if (io_alloc_async_data(req)) | |
5852 | return -EAGAIN; | |
5853 | ||
93642ef8 PB |
5854 | switch (req->opcode) { |
5855 | case IORING_OP_READV: | |
93642ef8 PB |
5856 | return io_rw_prep_async(req, READ); |
5857 | case IORING_OP_WRITEV: | |
93642ef8 PB |
5858 | return io_rw_prep_async(req, WRITE); |
5859 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
5860 | return io_sendmsg_prep_async(req); |
5861 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
5862 | return io_recvmsg_prep_async(req); |
5863 | case IORING_OP_CONNECT: | |
5864 | return io_connect_prep_async(req); | |
5865 | } | |
b7e298d2 PB |
5866 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
5867 | req->opcode); | |
5868 | return -EFAULT; | |
f67676d1 JA |
5869 | } |
5870 | ||
9cf7c104 PB |
5871 | static u32 io_get_sequence(struct io_kiocb *req) |
5872 | { | |
5873 | struct io_kiocb *pos; | |
5874 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 5875 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 5876 | |
f2f87370 PB |
5877 | io_for_each_link(pos, req) |
5878 | nr_reqs++; | |
9cf7c104 PB |
5879 | |
5880 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5881 | return total_submitted - nr_reqs; | |
5882 | } | |
5883 | ||
be7053b7 | 5884 | static int io_req_defer(struct io_kiocb *req) |
de0617e4 | 5885 | { |
a197f664 | 5886 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5887 | struct io_defer_entry *de; |
f67676d1 | 5888 | int ret; |
9cf7c104 | 5889 | u32 seq; |
de0617e4 | 5890 | |
9d858b21 | 5891 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5892 | if (likely(list_empty_careful(&ctx->defer_list) && |
5893 | !(req->flags & REQ_F_IO_DRAIN))) | |
5894 | return 0; | |
5895 | ||
5896 | seq = io_get_sequence(req); | |
5897 | /* Still a chance to pass the sequence check */ | |
5898 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5899 | return 0; |
5900 | ||
b7e298d2 | 5901 | ret = io_req_prep_async(req); |
be7053b7 PB |
5902 | if (ret) |
5903 | return ret; | |
cbdcb435 | 5904 | io_prep_async_link(req); |
27dc8338 PB |
5905 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5906 | if (!de) | |
5907 | return -ENOMEM; | |
2d28390a | 5908 | |
de0617e4 | 5909 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5910 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5911 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5912 | kfree(de); |
ae34817b PB |
5913 | io_queue_async_work(req); |
5914 | return -EIOCBQUEUED; | |
de0617e4 JA |
5915 | } |
5916 | ||
915967f6 | 5917 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5918 | de->req = req; |
9cf7c104 | 5919 | de->seq = seq; |
27dc8338 | 5920 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5921 | spin_unlock_irq(&ctx->completion_lock); |
5922 | return -EIOCBQUEUED; | |
5923 | } | |
5924 | ||
68fb8979 | 5925 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 5926 | { |
0e1b6fe3 PB |
5927 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5928 | switch (req->opcode) { | |
5929 | case IORING_OP_READV: | |
5930 | case IORING_OP_READ_FIXED: | |
5931 | case IORING_OP_READ: | |
bcda7baa | 5932 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5933 | break; |
5934 | case IORING_OP_RECVMSG: | |
5935 | case IORING_OP_RECV: | |
bcda7baa | 5936 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5937 | break; |
5938 | } | |
5939 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5940 | } |
5941 | ||
0e1b6fe3 PB |
5942 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5943 | switch (req->opcode) { | |
5944 | case IORING_OP_READV: | |
5945 | case IORING_OP_READ_FIXED: | |
5946 | case IORING_OP_READ: | |
5947 | case IORING_OP_WRITEV: | |
5948 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
5949 | case IORING_OP_WRITE: { |
5950 | struct io_async_rw *io = req->async_data; | |
5951 | if (io->free_iovec) | |
5952 | kfree(io->free_iovec); | |
0e1b6fe3 | 5953 | break; |
e8c2bc1f | 5954 | } |
0e1b6fe3 | 5955 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
5956 | case IORING_OP_SENDMSG: { |
5957 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
5958 | |
5959 | kfree(io->free_iov); | |
0e1b6fe3 | 5960 | break; |
e8c2bc1f | 5961 | } |
0e1b6fe3 PB |
5962 | case IORING_OP_SPLICE: |
5963 | case IORING_OP_TEE: | |
e1d767f0 PB |
5964 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
5965 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 5966 | break; |
f3cd4850 JA |
5967 | case IORING_OP_OPENAT: |
5968 | case IORING_OP_OPENAT2: | |
5969 | if (req->open.filename) | |
5970 | putname(req->open.filename); | |
5971 | break; | |
80a261fd JA |
5972 | case IORING_OP_RENAMEAT: |
5973 | putname(req->rename.oldpath); | |
5974 | putname(req->rename.newpath); | |
5975 | break; | |
14a1143b JA |
5976 | case IORING_OP_UNLINKAT: |
5977 | putname(req->unlink.filename); | |
5978 | break; | |
0e1b6fe3 PB |
5979 | } |
5980 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5981 | } |
99bc4c38 PB |
5982 | } |
5983 | ||
889fca73 | 5984 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 5985 | { |
a197f664 | 5986 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 5987 | const struct cred *creds = NULL; |
d625c6ee | 5988 | int ret; |
2b188cc1 | 5989 | |
003e8dcc JA |
5990 | if (req->work.creds && req->work.creds != current_cred()) |
5991 | creds = override_creds(req->work.creds); | |
5730b27e | 5992 | |
d625c6ee | 5993 | switch (req->opcode) { |
2b188cc1 | 5994 | case IORING_OP_NOP: |
889fca73 | 5995 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
5996 | break; |
5997 | case IORING_OP_READV: | |
edafccee | 5998 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5999 | case IORING_OP_READ: |
889fca73 | 6000 | ret = io_read(req, issue_flags); |
edafccee | 6001 | break; |
3529d8c2 | 6002 | case IORING_OP_WRITEV: |
edafccee | 6003 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6004 | case IORING_OP_WRITE: |
889fca73 | 6005 | ret = io_write(req, issue_flags); |
2b188cc1 | 6006 | break; |
c992fe29 | 6007 | case IORING_OP_FSYNC: |
45d189c6 | 6008 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6009 | break; |
221c5eb2 | 6010 | case IORING_OP_POLL_ADD: |
61e98203 | 6011 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6012 | break; |
6013 | case IORING_OP_POLL_REMOVE: | |
61e98203 | 6014 | ret = io_poll_remove(req, issue_flags); |
221c5eb2 | 6015 | break; |
5d17b4a4 | 6016 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6017 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6018 | break; |
0fa03c62 | 6019 | case IORING_OP_SENDMSG: |
889fca73 | 6020 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6021 | break; |
fddaface | 6022 | case IORING_OP_SEND: |
889fca73 | 6023 | ret = io_send(req, issue_flags); |
0fa03c62 | 6024 | break; |
aa1fa28f | 6025 | case IORING_OP_RECVMSG: |
889fca73 | 6026 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6027 | break; |
fddaface | 6028 | case IORING_OP_RECV: |
889fca73 | 6029 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6030 | break; |
5262f567 | 6031 | case IORING_OP_TIMEOUT: |
61e98203 | 6032 | ret = io_timeout(req, issue_flags); |
5262f567 | 6033 | break; |
11365043 | 6034 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6035 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6036 | break; |
17f2fe35 | 6037 | case IORING_OP_ACCEPT: |
889fca73 | 6038 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6039 | break; |
f8e85cf2 | 6040 | case IORING_OP_CONNECT: |
889fca73 | 6041 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6042 | break; |
62755e35 | 6043 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6044 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6045 | break; |
d63d1b5e | 6046 | case IORING_OP_FALLOCATE: |
45d189c6 | 6047 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6048 | break; |
15b71abe | 6049 | case IORING_OP_OPENAT: |
45d189c6 | 6050 | ret = io_openat(req, issue_flags); |
15b71abe | 6051 | break; |
b5dba59e | 6052 | case IORING_OP_CLOSE: |
889fca73 | 6053 | ret = io_close(req, issue_flags); |
b5dba59e | 6054 | break; |
05f3fb3c | 6055 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6056 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6057 | break; |
eddc7ef5 | 6058 | case IORING_OP_STATX: |
45d189c6 | 6059 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6060 | break; |
4840e418 | 6061 | case IORING_OP_FADVISE: |
45d189c6 | 6062 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6063 | break; |
c1ca757b | 6064 | case IORING_OP_MADVISE: |
45d189c6 | 6065 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6066 | break; |
cebdb986 | 6067 | case IORING_OP_OPENAT2: |
45d189c6 | 6068 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6069 | break; |
3e4827b0 | 6070 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6071 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6072 | break; |
7d67af2c | 6073 | case IORING_OP_SPLICE: |
45d189c6 | 6074 | ret = io_splice(req, issue_flags); |
7d67af2c | 6075 | break; |
ddf0322d | 6076 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6077 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6078 | break; |
067524e9 | 6079 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6080 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6081 | break; |
f2a8d5c7 | 6082 | case IORING_OP_TEE: |
45d189c6 | 6083 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6084 | break; |
36f4fa68 | 6085 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6086 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6087 | break; |
80a261fd | 6088 | case IORING_OP_RENAMEAT: |
45d189c6 | 6089 | ret = io_renameat(req, issue_flags); |
80a261fd | 6090 | break; |
14a1143b | 6091 | case IORING_OP_UNLINKAT: |
45d189c6 | 6092 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6093 | break; |
2b188cc1 JA |
6094 | default: |
6095 | ret = -EINVAL; | |
6096 | break; | |
6097 | } | |
6098 | ||
5730b27e JA |
6099 | if (creds) |
6100 | revert_creds(creds); | |
6101 | ||
def596e9 JA |
6102 | if (ret) |
6103 | return ret; | |
6104 | ||
b532576e JA |
6105 | /* If the op doesn't have a file, we're not polling for it */ |
6106 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6107 | const bool in_async = io_wq_current_is_worker(); |
6108 | ||
11ba820b JA |
6109 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6110 | if (in_async) | |
6111 | mutex_lock(&ctx->uring_lock); | |
6112 | ||
2e9dbe90 | 6113 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6114 | |
6115 | if (in_async) | |
6116 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6117 | } |
6118 | ||
6119 | return 0; | |
2b188cc1 JA |
6120 | } |
6121 | ||
5280f7e5 | 6122 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6123 | { |
6124 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6125 | struct io_kiocb *timeout; |
561fb04a | 6126 | int ret = 0; |
2b188cc1 | 6127 | |
6df1db6b PB |
6128 | timeout = io_prep_linked_timeout(req); |
6129 | if (timeout) | |
6130 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6131 | |
4014d943 | 6132 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6133 | ret = -ECANCELED; |
31b51510 | 6134 | |
561fb04a | 6135 | if (!ret) { |
561fb04a | 6136 | do { |
889fca73 | 6137 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6138 | /* |
6139 | * We can get EAGAIN for polled IO even though we're | |
6140 | * forcing a sync submission from here, since we can't | |
6141 | * wait for request slots on the block side. | |
6142 | */ | |
6143 | if (ret != -EAGAIN) | |
6144 | break; | |
6145 | cond_resched(); | |
6146 | } while (1); | |
6147 | } | |
31b51510 | 6148 | |
a3df7698 | 6149 | /* avoid locking problems by failing it from a clean context */ |
561fb04a | 6150 | if (ret) { |
a3df7698 | 6151 | /* io-wq is going to take one down */ |
de9b4cca | 6152 | req_ref_get(req); |
a3df7698 | 6153 | io_req_task_queue_fail(req, ret); |
edafccee | 6154 | } |
2b188cc1 JA |
6155 | } |
6156 | ||
7b29f92d JA |
6157 | #define FFS_ASYNC_READ 0x1UL |
6158 | #define FFS_ASYNC_WRITE 0x2UL | |
6159 | #ifdef CONFIG_64BIT | |
6160 | #define FFS_ISREG 0x4UL | |
6161 | #else | |
6162 | #define FFS_ISREG 0x0UL | |
6163 | #endif | |
6164 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
6165 | ||
dafecf19 PB |
6166 | static inline struct file **io_fixed_file_slot(struct fixed_rsrc_data *file_data, |
6167 | unsigned i) | |
65e19f54 | 6168 | { |
269bbe5f | 6169 | struct fixed_rsrc_table *table; |
65e19f54 | 6170 | |
dafecf19 PB |
6171 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
6172 | return &table->files[i & IORING_FILE_TABLE_MASK]; | |
6173 | } | |
6174 | ||
6175 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, | |
6176 | int index) | |
6177 | { | |
7b29f92d JA |
6178 | struct file **file_slot = io_fixed_file_slot(ctx->file_data, index); |
6179 | ||
6180 | return (struct file *) ((unsigned long) *file_slot & FFS_MASK); | |
65e19f54 JA |
6181 | } |
6182 | ||
8371adf5 PB |
6183 | static struct file *io_file_get(struct io_submit_state *state, |
6184 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6185 | { |
a197f664 | 6186 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6187 | struct file *file; |
09bb8394 | 6188 | |
8da11c19 | 6189 | if (fixed) { |
7b29f92d JA |
6190 | unsigned long file_ptr; |
6191 | ||
479f517b | 6192 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6193 | return NULL; |
b7620121 | 6194 | fd = array_index_nospec(fd, ctx->nr_user_files); |
7b29f92d JA |
6195 | file_ptr = (unsigned long) *io_fixed_file_slot(ctx->file_data, fd); |
6196 | file = (struct file *) (file_ptr & FFS_MASK); | |
6197 | file_ptr &= ~FFS_MASK; | |
6198 | /* mask in overlapping REQ_F and FFS bits */ | |
6199 | req->flags |= (file_ptr << REQ_F_ASYNC_READ_BIT); | |
36f72fe2 | 6200 | io_set_resource_node(req); |
09bb8394 | 6201 | } else { |
c826bd7a | 6202 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6203 | file = __io_file_get(state, fd); |
d44f554e JA |
6204 | |
6205 | /* we don't allow fixed io_uring files */ | |
6206 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6207 | io_req_track_inflight(req); | |
09bb8394 JA |
6208 | } |
6209 | ||
8371adf5 | 6210 | return file; |
09bb8394 JA |
6211 | } |
6212 | ||
2665abfd | 6213 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6214 | { |
ad8a48ac JA |
6215 | struct io_timeout_data *data = container_of(timer, |
6216 | struct io_timeout_data, timer); | |
90cd7e42 | 6217 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6218 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6219 | unsigned long flags; |
2665abfd JA |
6220 | |
6221 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6222 | prev = req->timeout.head; |
6223 | req->timeout.head = NULL; | |
2665abfd JA |
6224 | |
6225 | /* | |
6226 | * We don't expect the list to be empty, that will only happen if we | |
6227 | * race with the completion of the linked work. | |
6228 | */ | |
de9b4cca | 6229 | if (prev && req_ref_inc_not_zero(prev)) |
f2f87370 | 6230 | io_remove_next_linked(prev); |
90cd7e42 PB |
6231 | else |
6232 | prev = NULL; | |
2665abfd JA |
6233 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6234 | ||
6235 | if (prev) { | |
014db007 | 6236 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6237 | io_put_req_deferred(prev, 1); |
47f46768 | 6238 | } else { |
9ae1f8dd PB |
6239 | io_req_complete_post(req, -ETIME, 0); |
6240 | io_put_req_deferred(req, 1); | |
2665abfd | 6241 | } |
2665abfd JA |
6242 | return HRTIMER_NORESTART; |
6243 | } | |
6244 | ||
de968c18 | 6245 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6246 | { |
de968c18 PB |
6247 | struct io_ring_ctx *ctx = req->ctx; |
6248 | ||
6249 | spin_lock_irq(&ctx->completion_lock); | |
76a46e06 | 6250 | /* |
f2f87370 PB |
6251 | * If the back reference is NULL, then our linked request finished |
6252 | * before we got a chance to setup the timer | |
76a46e06 | 6253 | */ |
90cd7e42 | 6254 | if (req->timeout.head) { |
e8c2bc1f | 6255 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6256 | |
ad8a48ac JA |
6257 | data->timer.function = io_link_timeout_fn; |
6258 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6259 | data->mode); | |
2665abfd | 6260 | } |
76a46e06 | 6261 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6262 | /* drop submission reference */ |
76a46e06 JA |
6263 | io_put_req(req); |
6264 | } | |
2665abfd | 6265 | |
ad8a48ac | 6266 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6267 | { |
f2f87370 | 6268 | struct io_kiocb *nxt = req->link; |
2665abfd | 6269 | |
f2f87370 PB |
6270 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6271 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6272 | return NULL; |
2665abfd | 6273 | |
90cd7e42 | 6274 | nxt->timeout.head = req; |
900fad45 | 6275 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6276 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6277 | return nxt; |
2665abfd JA |
6278 | } |
6279 | ||
c5eef2b9 | 6280 | static void __io_queue_sqe(struct io_kiocb *req) |
2b188cc1 | 6281 | { |
d3d7298d | 6282 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); |
e0c5c576 | 6283 | int ret; |
2b188cc1 | 6284 | |
c5eef2b9 | 6285 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6286 | |
491381ce JA |
6287 | /* |
6288 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6289 | * doesn't support non-blocking read/write attempts | |
6290 | */ | |
1840038e | 6291 | if (likely(!ret)) { |
0d63c148 | 6292 | /* drop submission reference */ |
e342c807 | 6293 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6294 | struct io_ring_ctx *ctx = req->ctx; |
6295 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
e65ef56d | 6296 | |
6dd0be1e | 6297 | cs->reqs[cs->nr++] = req; |
d3d7298d | 6298 | if (cs->nr == ARRAY_SIZE(cs->reqs)) |
c5eef2b9 | 6299 | io_submit_flush_completions(cs, ctx); |
9affd664 | 6300 | } else { |
d3d7298d | 6301 | io_put_req(req); |
0d63c148 | 6302 | } |
1840038e PB |
6303 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
6304 | if (!io_arm_poll_handler(req)) { | |
6305 | /* | |
6306 | * Queued up for async execution, worker will release | |
6307 | * submit reference when the iocb is actually submitted. | |
6308 | */ | |
6309 | io_queue_async_work(req); | |
6310 | } | |
0d63c148 | 6311 | } else { |
f41db273 | 6312 | io_req_complete_failed(req, ret); |
9e645e11 | 6313 | } |
d3d7298d PB |
6314 | if (linked_timeout) |
6315 | io_queue_linked_timeout(linked_timeout); | |
2b188cc1 JA |
6316 | } |
6317 | ||
be7053b7 | 6318 | static void io_queue_sqe(struct io_kiocb *req) |
4fe2c963 JL |
6319 | { |
6320 | int ret; | |
6321 | ||
be7053b7 | 6322 | ret = io_req_defer(req); |
4fe2c963 JL |
6323 | if (ret) { |
6324 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6325 | fail_req: |
f41db273 | 6326 | io_req_complete_failed(req, ret); |
4fe2c963 | 6327 | } |
2550878f | 6328 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
b7e298d2 | 6329 | ret = io_req_prep_async(req); |
be7053b7 PB |
6330 | if (unlikely(ret)) |
6331 | goto fail_req; | |
ce35a47a JA |
6332 | io_queue_async_work(req); |
6333 | } else { | |
c5eef2b9 | 6334 | __io_queue_sqe(req); |
ce35a47a | 6335 | } |
4fe2c963 JL |
6336 | } |
6337 | ||
b16fed66 PB |
6338 | /* |
6339 | * Check SQE restrictions (opcode and flags). | |
6340 | * | |
6341 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6342 | */ | |
6343 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6344 | struct io_kiocb *req, | |
6345 | unsigned int sqe_flags) | |
4fe2c963 | 6346 | { |
b16fed66 PB |
6347 | if (!ctx->restricted) |
6348 | return true; | |
6349 | ||
6350 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6351 | return false; | |
6352 | ||
6353 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6354 | ctx->restrictions.sqe_flags_required) | |
6355 | return false; | |
6356 | ||
6357 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6358 | ctx->restrictions.sqe_flags_required)) | |
6359 | return false; | |
6360 | ||
6361 | return true; | |
4fe2c963 JL |
6362 | } |
6363 | ||
b16fed66 PB |
6364 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6365 | const struct io_uring_sqe *sqe) | |
6366 | { | |
6367 | struct io_submit_state *state; | |
6368 | unsigned int sqe_flags; | |
003e8dcc | 6369 | int personality, ret = 0; |
b16fed66 PB |
6370 | |
6371 | req->opcode = READ_ONCE(sqe->opcode); | |
6372 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
6373 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
6374 | req->user_data = READ_ONCE(sqe->user_data); | |
6375 | req->async_data = NULL; | |
6376 | req->file = NULL; | |
6377 | req->ctx = ctx; | |
6378 | req->link = NULL; | |
6379 | req->fixed_rsrc_refs = NULL; | |
6380 | /* one is dropped after submission, the other at completion */ | |
abc54d63 | 6381 | atomic_set(&req->refs, 2); |
b16fed66 PB |
6382 | req->task = current; |
6383 | req->result = 0; | |
93e68e03 | 6384 | req->work.creds = NULL; |
b16fed66 PB |
6385 | |
6386 | /* enforce forwards compatibility on users */ | |
ebf4a5db PB |
6387 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) { |
6388 | req->flags = 0; | |
b16fed66 | 6389 | return -EINVAL; |
ebf4a5db | 6390 | } |
b16fed66 PB |
6391 | |
6392 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6393 | return -EINVAL; | |
6394 | ||
b16fed66 PB |
6395 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6396 | return -EACCES; | |
6397 | ||
6398 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6399 | !io_op_defs[req->opcode].buffer_select) | |
6400 | return -EOPNOTSUPP; | |
863e0560 | 6401 | |
003e8dcc JA |
6402 | personality = READ_ONCE(sqe->personality); |
6403 | if (personality) { | |
61cf9370 | 6404 | req->work.creds = xa_load(&ctx->personalities, personality); |
003e8dcc JA |
6405 | if (!req->work.creds) |
6406 | return -EINVAL; | |
6407 | get_cred(req->work.creds); | |
003e8dcc | 6408 | } |
b16fed66 PB |
6409 | state = &ctx->submit_state; |
6410 | ||
6411 | /* | |
6412 | * Plug now if we have more than 1 IO left after this, and the target | |
6413 | * is potentially a read/write to block based storage. | |
6414 | */ | |
6415 | if (!state->plug_started && state->ios_left > 1 && | |
6416 | io_op_defs[req->opcode].plug) { | |
6417 | blk_start_plug(&state->plug); | |
6418 | state->plug_started = true; | |
6419 | } | |
6420 | ||
6421 | if (io_op_defs[req->opcode].needs_file) { | |
6422 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6423 | ||
6424 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
6425 | if (unlikely(!req->file)) | |
6426 | ret = -EBADF; | |
6427 | } | |
6428 | ||
6429 | state->ios_left--; | |
6430 | return ret; | |
6431 | } | |
6432 | ||
a6b8cadc | 6433 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 6434 | const struct io_uring_sqe *sqe) |
9e645e11 | 6435 | { |
a1ab7b35 | 6436 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 6437 | int ret; |
9e645e11 | 6438 | |
a6b8cadc PB |
6439 | ret = io_init_req(ctx, req, sqe); |
6440 | if (unlikely(ret)) { | |
6441 | fail_req: | |
de59bc10 PB |
6442 | if (link->head) { |
6443 | /* fail even hard links since we don't submit */ | |
cf109604 | 6444 | link->head->flags |= REQ_F_FAIL_LINK; |
f41db273 | 6445 | io_req_complete_failed(link->head, -ECANCELED); |
de59bc10 PB |
6446 | link->head = NULL; |
6447 | } | |
f41db273 | 6448 | io_req_complete_failed(req, ret); |
a6b8cadc PB |
6449 | return ret; |
6450 | } | |
be7053b7 PB |
6451 | ret = io_req_prep(req, sqe); |
6452 | if (unlikely(ret)) | |
6453 | goto fail_req; | |
a6b8cadc | 6454 | |
be7053b7 | 6455 | /* don't need @sqe from now on */ |
a6b8cadc PB |
6456 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
6457 | true, ctx->flags & IORING_SETUP_SQPOLL); | |
6458 | ||
9e645e11 JA |
6459 | /* |
6460 | * If we already have a head request, queue this one for async | |
6461 | * submittal once the head completes. If we don't have a head but | |
6462 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6463 | * submitted sync once the chain is complete. If none of those | |
6464 | * conditions are true (normal request), then just queue it. | |
6465 | */ | |
863e0560 PB |
6466 | if (link->head) { |
6467 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6468 | |
8cdf2193 PB |
6469 | /* |
6470 | * Taking sequential execution of a link, draining both sides | |
6471 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6472 | * requests in the link. So, it drains the head and the | |
6473 | * next after the link request. The last one is done via | |
6474 | * drain_next flag to persist the effect across calls. | |
6475 | */ | |
ef4ff581 | 6476 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6477 | head->flags |= REQ_F_IO_DRAIN; |
6478 | ctx->drain_next = 1; | |
6479 | } | |
b7e298d2 | 6480 | ret = io_req_prep_async(req); |
cf109604 | 6481 | if (unlikely(ret)) |
a6b8cadc | 6482 | goto fail_req; |
9d76377f | 6483 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6484 | link->last->link = req; |
863e0560 | 6485 | link->last = req; |
32fe525b PB |
6486 | |
6487 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6488 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
de59bc10 | 6489 | io_queue_sqe(head); |
863e0560 | 6490 | link->head = NULL; |
32fe525b | 6491 | } |
9e645e11 | 6492 | } else { |
711be031 PB |
6493 | if (unlikely(ctx->drain_next)) { |
6494 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6495 | ctx->drain_next = 0; |
711be031 | 6496 | } |
ef4ff581 | 6497 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
6498 | link->head = req; |
6499 | link->last = req; | |
711be031 | 6500 | } else { |
be7053b7 | 6501 | io_queue_sqe(req); |
711be031 | 6502 | } |
9e645e11 | 6503 | } |
2e6e1fde | 6504 | |
1d4240cc | 6505 | return 0; |
9e645e11 JA |
6506 | } |
6507 | ||
9a56a232 JA |
6508 | /* |
6509 | * Batched submission is done, ensure local IO is flushed out. | |
6510 | */ | |
ba88ff11 PB |
6511 | static void io_submit_state_end(struct io_submit_state *state, |
6512 | struct io_ring_ctx *ctx) | |
9a56a232 | 6513 | { |
a1ab7b35 | 6514 | if (state->link.head) |
de59bc10 | 6515 | io_queue_sqe(state->link.head); |
6dd0be1e | 6516 | if (state->comp.nr) |
ba88ff11 | 6517 | io_submit_flush_completions(&state->comp, ctx); |
27926b68 JA |
6518 | if (state->plug_started) |
6519 | blk_finish_plug(&state->plug); | |
9f13c35b | 6520 | io_state_file_put(state); |
9a56a232 JA |
6521 | } |
6522 | ||
6523 | /* | |
6524 | * Start submission side cache. | |
6525 | */ | |
6526 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6527 | unsigned int max_ios) |
9a56a232 | 6528 | { |
27926b68 | 6529 | state->plug_started = false; |
9a56a232 | 6530 | state->ios_left = max_ios; |
a1ab7b35 PB |
6531 | /* set only head, no need to init link_last in advance */ |
6532 | state->link.head = NULL; | |
9a56a232 JA |
6533 | } |
6534 | ||
2b188cc1 JA |
6535 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6536 | { | |
75b28aff | 6537 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6538 | |
caf582c6 PB |
6539 | /* |
6540 | * Ensure any loads from the SQEs are done at this point, | |
6541 | * since once we write the new head, the application could | |
6542 | * write new data to them. | |
6543 | */ | |
6544 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6545 | } |
6546 | ||
2b188cc1 | 6547 | /* |
3529d8c2 | 6548 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6549 | * that is mapped by userspace. This means that care needs to be taken to |
6550 | * ensure that reads are stable, as we cannot rely on userspace always | |
6551 | * being a good citizen. If members of the sqe are validated and then later | |
6552 | * used, it's important that those reads are done through READ_ONCE() to | |
6553 | * prevent a re-load down the line. | |
6554 | */ | |
709b302f | 6555 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6556 | { |
75b28aff | 6557 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6558 | unsigned head; |
6559 | ||
6560 | /* | |
6561 | * The cached sq head (or cq tail) serves two purposes: | |
6562 | * | |
6563 | * 1) allows us to batch the cost of updating the user visible | |
6564 | * head updates. | |
6565 | * 2) allows the kernel side to track the head on its own, even | |
6566 | * though the application is the one updating it. | |
6567 | */ | |
4fccfcbb | 6568 | head = READ_ONCE(sq_array[ctx->cached_sq_head++ & ctx->sq_mask]); |
709b302f PB |
6569 | if (likely(head < ctx->sq_entries)) |
6570 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6571 | |
6572 | /* drop invalid entries */ | |
498ccd9e | 6573 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6574 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6575 | return NULL; |
6576 | } | |
6577 | ||
0f212204 | 6578 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6579 | { |
46c4e16a | 6580 | int submitted = 0; |
6c271ce2 | 6581 | |
c4a2ed72 | 6582 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 | 6583 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6c503150 | 6584 | if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6585 | return -EBUSY; |
6586 | } | |
6c271ce2 | 6587 | |
ee7d46d9 PB |
6588 | /* make sure SQ entry isn't read before tail */ |
6589 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6590 | |
2b85edfc PB |
6591 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6592 | return -EAGAIN; | |
6c271ce2 | 6593 | |
d8a6df10 | 6594 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6595 | refcount_add(nr, ¤t->usage); |
ba88ff11 | 6596 | io_submit_state_start(&ctx->submit_state, nr); |
b14cca0c | 6597 | |
46c4e16a | 6598 | while (submitted < nr) { |
3529d8c2 | 6599 | const struct io_uring_sqe *sqe; |
196be95c | 6600 | struct io_kiocb *req; |
fb5ccc98 | 6601 | |
258b29a9 | 6602 | req = io_alloc_req(ctx); |
196be95c PB |
6603 | if (unlikely(!req)) { |
6604 | if (!submitted) | |
6605 | submitted = -EAGAIN; | |
fb5ccc98 | 6606 | break; |
196be95c | 6607 | } |
4fccfcbb PB |
6608 | sqe = io_get_sqe(ctx); |
6609 | if (unlikely(!sqe)) { | |
6610 | kmem_cache_free(req_cachep, req); | |
6611 | break; | |
6612 | } | |
d3656344 JA |
6613 | /* will complete beyond this point, count as submitted */ |
6614 | submitted++; | |
a1ab7b35 | 6615 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 6616 | break; |
6c271ce2 JA |
6617 | } |
6618 | ||
9466f437 PB |
6619 | if (unlikely(submitted != nr)) { |
6620 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6621 | struct io_uring_task *tctx = current->io_uring; |
6622 | int unused = nr - ref_used; | |
9466f437 | 6623 | |
d8a6df10 JA |
6624 | percpu_ref_put_many(&ctx->refs, unused); |
6625 | percpu_counter_sub(&tctx->inflight, unused); | |
6626 | put_task_struct_many(current, unused); | |
9466f437 | 6627 | } |
6c271ce2 | 6628 | |
a1ab7b35 | 6629 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
6630 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6631 | io_commit_sqring(ctx); | |
6632 | ||
6c271ce2 JA |
6633 | return submitted; |
6634 | } | |
6635 | ||
23b3628e XW |
6636 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6637 | { | |
6638 | /* Tell userspace we may need a wakeup call */ | |
6639 | spin_lock_irq(&ctx->completion_lock); | |
6640 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6641 | spin_unlock_irq(&ctx->completion_lock); | |
6642 | } | |
6643 | ||
6644 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6645 | { | |
6646 | spin_lock_irq(&ctx->completion_lock); | |
6647 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6648 | spin_unlock_irq(&ctx->completion_lock); | |
6649 | } | |
6650 | ||
08369246 | 6651 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6652 | { |
c8d1ba58 | 6653 | unsigned int to_submit; |
bdcd3eab | 6654 | int ret = 0; |
6c271ce2 | 6655 | |
c8d1ba58 | 6656 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
6657 | /* if we're handling multiple rings, cap submit size for fairness */ |
6658 | if (cap_entries && to_submit > 8) | |
6659 | to_submit = 8; | |
6660 | ||
906a3c6f | 6661 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 6662 | unsigned nr_events = 0; |
a4c0b3de | 6663 | |
c8d1ba58 | 6664 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 6665 | if (!list_empty(&ctx->iopoll_list)) |
c8d1ba58 | 6666 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 6667 | |
0298ef96 PB |
6668 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
6669 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 6670 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 JA |
6671 | mutex_unlock(&ctx->uring_lock); |
6672 | } | |
6c271ce2 | 6673 | |
90554200 JA |
6674 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) |
6675 | wake_up(&ctx->sqo_sq_wait); | |
6c271ce2 | 6676 | |
08369246 XW |
6677 | return ret; |
6678 | } | |
6c271ce2 | 6679 | |
08369246 XW |
6680 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
6681 | { | |
6682 | struct io_ring_ctx *ctx; | |
6683 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 6684 | |
c9dca27d PB |
6685 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6686 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 6687 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 6688 | } |
6c271ce2 | 6689 | |
c8d1ba58 JA |
6690 | static int io_sq_thread(void *data) |
6691 | { | |
69fb2131 JA |
6692 | struct io_sq_data *sqd = data; |
6693 | struct io_ring_ctx *ctx; | |
a0d9205f | 6694 | unsigned long timeout = 0; |
37d1e2e3 | 6695 | char buf[TASK_COMM_LEN]; |
08369246 | 6696 | DEFINE_WAIT(wait); |
6c271ce2 | 6697 | |
696ee88a | 6698 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 6699 | set_task_comm(current, buf); |
37d1e2e3 JA |
6700 | current->pf_io_worker = NULL; |
6701 | ||
6702 | if (sqd->sq_cpu != -1) | |
6703 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
6704 | else | |
6705 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
6706 | current->flags |= PF_NO_SETAFFINITY; | |
6707 | ||
09a6f4ef | 6708 | mutex_lock(&sqd->lock); |
05962f95 | 6709 | while (!test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)) { |
08369246 XW |
6710 | int ret; |
6711 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f | 6712 | |
82734c5b JA |
6713 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || |
6714 | signal_pending(current)) { | |
6715 | bool did_sig = false; | |
6716 | ||
09a6f4ef | 6717 | mutex_unlock(&sqd->lock); |
82734c5b JA |
6718 | if (signal_pending(current)) { |
6719 | struct ksignal ksig; | |
6720 | ||
6721 | did_sig = get_signal(&ksig); | |
6722 | } | |
05962f95 | 6723 | cond_resched(); |
09a6f4ef | 6724 | mutex_lock(&sqd->lock); |
82734c5b JA |
6725 | if (did_sig) |
6726 | break; | |
521d6a73 | 6727 | io_run_task_work(); |
b7f5a0bf | 6728 | io_run_task_work_head(&sqd->park_task_work); |
08369246 | 6729 | timeout = jiffies + sqd->sq_thread_idle; |
7d41e854 | 6730 | continue; |
08369246 | 6731 | } |
08369246 | 6732 | sqt_spin = false; |
e95eee2d | 6733 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 6734 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7c30f36a SM |
6735 | const struct cred *creds = NULL; |
6736 | ||
6737 | if (ctx->sq_creds != current_cred()) | |
6738 | creds = override_creds(ctx->sq_creds); | |
08369246 | 6739 | ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a SM |
6740 | if (creds) |
6741 | revert_creds(creds); | |
08369246 XW |
6742 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
6743 | sqt_spin = true; | |
69fb2131 | 6744 | } |
6c271ce2 | 6745 | |
08369246 | 6746 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 JA |
6747 | io_run_task_work(); |
6748 | cond_resched(); | |
08369246 XW |
6749 | if (sqt_spin) |
6750 | timeout = jiffies + sqd->sq_thread_idle; | |
6751 | continue; | |
6752 | } | |
6753 | ||
08369246 XW |
6754 | needs_sched = true; |
6755 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
6756 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
6757 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6758 | !list_empty_careful(&ctx->iopoll_list)) { | |
6759 | needs_sched = false; | |
6760 | break; | |
6761 | } | |
6762 | if (io_sqring_entries(ctx)) { | |
6763 | needs_sched = false; | |
6764 | break; | |
6765 | } | |
6766 | } | |
6767 | ||
05962f95 | 6768 | if (needs_sched && !test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state)) { |
69fb2131 JA |
6769 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6770 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 6771 | |
09a6f4ef | 6772 | mutex_unlock(&sqd->lock); |
69fb2131 | 6773 | schedule(); |
09a6f4ef | 6774 | mutex_lock(&sqd->lock); |
69fb2131 JA |
6775 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6776 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6777 | } |
08369246 XW |
6778 | |
6779 | finish_wait(&sqd->wait, &wait); | |
b7f5a0bf | 6780 | io_run_task_work_head(&sqd->park_task_work); |
08369246 | 6781 | timeout = jiffies + sqd->sq_thread_idle; |
6c271ce2 | 6782 | } |
28cea78a | 6783 | |
521d6a73 PB |
6784 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6785 | io_uring_cancel_sqpoll(ctx); | |
37d1e2e3 | 6786 | sqd->thread = NULL; |
05962f95 | 6787 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 6788 | io_ring_set_wakeup_flag(ctx); |
09a6f4ef | 6789 | mutex_unlock(&sqd->lock); |
521d6a73 PB |
6790 | |
6791 | io_run_task_work(); | |
b7f5a0bf | 6792 | io_run_task_work_head(&sqd->park_task_work); |
37d1e2e3 JA |
6793 | complete(&sqd->exited); |
6794 | do_exit(0); | |
6c271ce2 JA |
6795 | } |
6796 | ||
bda52162 JA |
6797 | struct io_wait_queue { |
6798 | struct wait_queue_entry wq; | |
6799 | struct io_ring_ctx *ctx; | |
6800 | unsigned to_wait; | |
6801 | unsigned nr_timeouts; | |
6802 | }; | |
6803 | ||
6c503150 | 6804 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
6805 | { |
6806 | struct io_ring_ctx *ctx = iowq->ctx; | |
6807 | ||
6808 | /* | |
d195a66e | 6809 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6810 | * started waiting. For timeouts, we always want to return to userspace, |
6811 | * regardless of event count. | |
6812 | */ | |
6c503150 | 6813 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
6814 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6815 | } | |
6816 | ||
6817 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6818 | int wake_flags, void *key) | |
6819 | { | |
6820 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6821 | wq); | |
6822 | ||
6c503150 PB |
6823 | /* |
6824 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
6825 | * the task, and the next invocation will do it. | |
6826 | */ | |
6827 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow)) | |
6828 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6829 | return -1; | |
bda52162 JA |
6830 | } |
6831 | ||
af9c1a44 JA |
6832 | static int io_run_task_work_sig(void) |
6833 | { | |
6834 | if (io_run_task_work()) | |
6835 | return 1; | |
6836 | if (!signal_pending(current)) | |
6837 | return 0; | |
0b8cfa97 | 6838 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 6839 | return -ERESTARTSYS; |
af9c1a44 JA |
6840 | return -EINTR; |
6841 | } | |
6842 | ||
eeb60b9a PB |
6843 | /* when returns >0, the caller should retry */ |
6844 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
6845 | struct io_wait_queue *iowq, | |
6846 | signed long *timeout) | |
6847 | { | |
6848 | int ret; | |
6849 | ||
6850 | /* make sure we run task_work before checking for signals */ | |
6851 | ret = io_run_task_work_sig(); | |
6852 | if (ret || io_should_wake(iowq)) | |
6853 | return ret; | |
6854 | /* let the caller flush overflows, retry */ | |
6855 | if (test_bit(0, &ctx->cq_check_overflow)) | |
6856 | return 1; | |
6857 | ||
6858 | *timeout = schedule_timeout(*timeout); | |
6859 | return !*timeout ? -ETIME : 1; | |
6860 | } | |
6861 | ||
2b188cc1 JA |
6862 | /* |
6863 | * Wait until events become available, if we don't already have some. The | |
6864 | * application must reap them itself, as they reside on the shared cq ring. | |
6865 | */ | |
6866 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
6867 | const sigset_t __user *sig, size_t sigsz, |
6868 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 6869 | { |
bda52162 JA |
6870 | struct io_wait_queue iowq = { |
6871 | .wq = { | |
6872 | .private = current, | |
6873 | .func = io_wake_function, | |
6874 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6875 | }, | |
6876 | .ctx = ctx, | |
6877 | .to_wait = min_events, | |
6878 | }; | |
75b28aff | 6879 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
6880 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
6881 | int ret; | |
2b188cc1 | 6882 | |
b41e9852 | 6883 | do { |
6c503150 PB |
6884 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6885 | if (io_cqring_events(ctx) >= min_events) | |
b41e9852 | 6886 | return 0; |
4c6e277c | 6887 | if (!io_run_task_work()) |
b41e9852 | 6888 | break; |
b41e9852 | 6889 | } while (1); |
2b188cc1 JA |
6890 | |
6891 | if (sig) { | |
9e75ad5d AB |
6892 | #ifdef CONFIG_COMPAT |
6893 | if (in_compat_syscall()) | |
6894 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6895 | sigsz); |
9e75ad5d AB |
6896 | else |
6897 | #endif | |
b772434b | 6898 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6899 | |
2b188cc1 JA |
6900 | if (ret) |
6901 | return ret; | |
6902 | } | |
6903 | ||
c73ebb68 | 6904 | if (uts) { |
c1d5a224 PB |
6905 | struct timespec64 ts; |
6906 | ||
c73ebb68 HX |
6907 | if (get_timespec64(&ts, uts)) |
6908 | return -EFAULT; | |
6909 | timeout = timespec64_to_jiffies(&ts); | |
6910 | } | |
6911 | ||
bda52162 | 6912 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6913 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 6914 | do { |
ca0a2651 JA |
6915 | /* if we can't even flush overflow, don't wait for more */ |
6916 | if (!io_cqring_overflow_flush(ctx, false, NULL, NULL)) { | |
6917 | ret = -EBUSY; | |
6918 | break; | |
6919 | } | |
bda52162 JA |
6920 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, |
6921 | TASK_INTERRUPTIBLE); | |
eeb60b9a PB |
6922 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
6923 | finish_wait(&ctx->wait, &iowq.wq); | |
ca0a2651 | 6924 | cond_resched(); |
eeb60b9a | 6925 | } while (ret > 0); |
bda52162 | 6926 | |
b7db41c9 | 6927 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6928 | |
75b28aff | 6929 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6930 | } |
6931 | ||
6b06314c JA |
6932 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6933 | { | |
6934 | #if defined(CONFIG_UNIX) | |
6935 | if (ctx->ring_sock) { | |
6936 | struct sock *sock = ctx->ring_sock->sk; | |
6937 | struct sk_buff *skb; | |
6938 | ||
6939 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6940 | kfree_skb(skb); | |
6941 | } | |
6942 | #else | |
6943 | int i; | |
6944 | ||
65e19f54 JA |
6945 | for (i = 0; i < ctx->nr_user_files; i++) { |
6946 | struct file *file; | |
6947 | ||
6948 | file = io_file_from_index(ctx, i); | |
6949 | if (file) | |
6950 | fput(file); | |
6951 | } | |
6b06314c JA |
6952 | #endif |
6953 | } | |
6954 | ||
00835dce | 6955 | static void io_rsrc_data_ref_zero(struct percpu_ref *ref) |
05f3fb3c | 6956 | { |
269bbe5f | 6957 | struct fixed_rsrc_data *data; |
05f3fb3c | 6958 | |
269bbe5f | 6959 | data = container_of(ref, struct fixed_rsrc_data, refs); |
05f3fb3c JA |
6960 | complete(&data->done); |
6961 | } | |
6962 | ||
2a63b2d9 | 6963 | static inline void io_rsrc_ref_lock(struct io_ring_ctx *ctx) |
1642b445 | 6964 | { |
2a63b2d9 | 6965 | spin_lock_bh(&ctx->rsrc_ref_lock); |
1642b445 PB |
6966 | } |
6967 | ||
2a63b2d9 | 6968 | static inline void io_rsrc_ref_unlock(struct io_ring_ctx *ctx) |
6b06314c | 6969 | { |
2a63b2d9 BM |
6970 | spin_unlock_bh(&ctx->rsrc_ref_lock); |
6971 | } | |
65e19f54 | 6972 | |
d67d2263 BM |
6973 | static void io_sqe_rsrc_set_node(struct io_ring_ctx *ctx, |
6974 | struct fixed_rsrc_data *rsrc_data, | |
269bbe5f | 6975 | struct fixed_rsrc_ref_node *ref_node) |
1642b445 | 6976 | { |
2a63b2d9 | 6977 | io_rsrc_ref_lock(ctx); |
269bbe5f | 6978 | rsrc_data->node = ref_node; |
d67d2263 | 6979 | list_add_tail(&ref_node->node, &ctx->rsrc_ref_list); |
2a63b2d9 | 6980 | io_rsrc_ref_unlock(ctx); |
269bbe5f | 6981 | percpu_ref_get(&rsrc_data->refs); |
1642b445 PB |
6982 | } |
6983 | ||
8bad28d8 | 6984 | static void io_sqe_rsrc_kill_node(struct io_ring_ctx *ctx, struct fixed_rsrc_data *data) |
6b06314c | 6985 | { |
8bad28d8 | 6986 | struct fixed_rsrc_ref_node *ref_node = NULL; |
6b06314c | 6987 | |
2a63b2d9 | 6988 | io_rsrc_ref_lock(ctx); |
1e5d770b | 6989 | ref_node = data->node; |
e6cb007c | 6990 | data->node = NULL; |
2a63b2d9 | 6991 | io_rsrc_ref_unlock(ctx); |
05589553 XW |
6992 | if (ref_node) |
6993 | percpu_ref_kill(&ref_node->refs); | |
8bad28d8 HX |
6994 | } |
6995 | ||
8dd03afe PB |
6996 | static int io_rsrc_refnode_prealloc(struct io_ring_ctx *ctx) |
6997 | { | |
6998 | if (ctx->rsrc_backup_node) | |
6999 | return 0; | |
7000 | ctx->rsrc_backup_node = alloc_fixed_rsrc_ref_node(ctx); | |
7001 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; | |
7002 | } | |
7003 | ||
7004 | static struct fixed_rsrc_ref_node * | |
7005 | io_rsrc_refnode_get(struct io_ring_ctx *ctx, | |
7006 | struct fixed_rsrc_data *rsrc_data, | |
7007 | void (*rsrc_put)(struct io_ring_ctx *ctx, | |
7008 | struct io_rsrc_put *prsrc)) | |
7009 | { | |
7010 | struct fixed_rsrc_ref_node *node = ctx->rsrc_backup_node; | |
7011 | ||
7012 | WARN_ON_ONCE(!node); | |
7013 | ||
7014 | ctx->rsrc_backup_node = NULL; | |
7015 | node->rsrc_data = rsrc_data; | |
7016 | node->rsrc_put = rsrc_put; | |
7017 | return node; | |
7018 | } | |
7019 | ||
8bad28d8 HX |
7020 | static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data, |
7021 | struct io_ring_ctx *ctx, | |
f2303b1f PB |
7022 | void (*rsrc_put)(struct io_ring_ctx *ctx, |
7023 | struct io_rsrc_put *prsrc)) | |
8bad28d8 | 7024 | { |
8dd03afe | 7025 | struct fixed_rsrc_ref_node *node; |
8bad28d8 | 7026 | int ret; |
05589553 | 7027 | |
8bad28d8 HX |
7028 | if (data->quiesce) |
7029 | return -ENXIO; | |
05589553 | 7030 | |
8bad28d8 | 7031 | data->quiesce = true; |
1ffc5422 | 7032 | do { |
8dd03afe PB |
7033 | ret = io_rsrc_refnode_prealloc(ctx); |
7034 | if (ret) | |
f2303b1f | 7035 | break; |
8bad28d8 HX |
7036 | io_sqe_rsrc_kill_node(ctx, data); |
7037 | percpu_ref_kill(&data->refs); | |
7038 | flush_delayed_work(&ctx->rsrc_put_work); | |
7039 | ||
1ffc5422 PB |
7040 | ret = wait_for_completion_interruptible(&data->done); |
7041 | if (!ret) | |
7042 | break; | |
8bad28d8 | 7043 | |
cb5e1b81 | 7044 | percpu_ref_resurrect(&data->refs); |
8dd03afe PB |
7045 | node = io_rsrc_refnode_get(ctx, data, rsrc_put); |
7046 | io_sqe_rsrc_set_node(ctx, data, node); | |
cb5e1b81 | 7047 | reinit_completion(&data->done); |
8dd03afe | 7048 | |
8bad28d8 | 7049 | mutex_unlock(&ctx->uring_lock); |
1ffc5422 | 7050 | ret = io_run_task_work_sig(); |
8bad28d8 | 7051 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7052 | } while (ret >= 0); |
8bad28d8 | 7053 | data->quiesce = false; |
05f3fb3c | 7054 | |
8bad28d8 | 7055 | return ret; |
d7954b2b BM |
7056 | } |
7057 | ||
1ad555c6 BM |
7058 | static struct fixed_rsrc_data *alloc_fixed_rsrc_data(struct io_ring_ctx *ctx) |
7059 | { | |
7060 | struct fixed_rsrc_data *data; | |
7061 | ||
7062 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7063 | if (!data) | |
7064 | return NULL; | |
7065 | ||
00835dce | 7066 | if (percpu_ref_init(&data->refs, io_rsrc_data_ref_zero, |
1ad555c6 BM |
7067 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7068 | kfree(data); | |
7069 | return NULL; | |
7070 | } | |
7071 | data->ctx = ctx; | |
7072 | init_completion(&data->done); | |
7073 | return data; | |
7074 | } | |
7075 | ||
7076 | static void free_fixed_rsrc_data(struct fixed_rsrc_data *data) | |
7077 | { | |
7078 | percpu_ref_exit(&data->refs); | |
7079 | kfree(data->table); | |
7080 | kfree(data); | |
7081 | } | |
7082 | ||
d7954b2b BM |
7083 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7084 | { | |
7085 | struct fixed_rsrc_data *data = ctx->file_data; | |
d7954b2b BM |
7086 | unsigned nr_tables, i; |
7087 | int ret; | |
7088 | ||
8bad28d8 HX |
7089 | /* |
7090 | * percpu_ref_is_dying() is to stop parallel files unregister | |
7091 | * Since we possibly drop uring lock later in this function to | |
7092 | * run task work. | |
7093 | */ | |
7094 | if (!data || percpu_ref_is_dying(&data->refs)) | |
d7954b2b | 7095 | return -ENXIO; |
f2303b1f | 7096 | ret = io_rsrc_ref_quiesce(data, ctx, io_ring_file_put); |
d7954b2b BM |
7097 | if (ret) |
7098 | return ret; | |
7099 | ||
6b06314c | 7100 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7101 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7102 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7103 | kfree(data->table[i].files); |
1ad555c6 | 7104 | free_fixed_rsrc_data(data); |
05f3fb3c | 7105 | ctx->file_data = NULL; |
6b06314c JA |
7106 | ctx->nr_user_files = 0; |
7107 | return 0; | |
7108 | } | |
7109 | ||
37d1e2e3 | 7110 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7111 | __releases(&sqd->lock) |
37d1e2e3 | 7112 | { |
521d6a73 PB |
7113 | WARN_ON_ONCE(sqd->thread == current); |
7114 | ||
9e138a48 PB |
7115 | /* |
7116 | * Do the dance but not conditional clear_bit() because it'd race with | |
7117 | * other threads incrementing park_pending and setting the bit. | |
7118 | */ | |
37d1e2e3 | 7119 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7120 | if (atomic_dec_return(&sqd->park_pending)) |
7121 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7122 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7123 | } |
7124 | ||
86e0d676 | 7125 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7126 | __acquires(&sqd->lock) |
37d1e2e3 | 7127 | { |
521d6a73 PB |
7128 | WARN_ON_ONCE(sqd->thread == current); |
7129 | ||
9e138a48 | 7130 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7131 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7132 | mutex_lock(&sqd->lock); |
05962f95 | 7133 | if (sqd->thread) |
86e0d676 | 7134 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7135 | } |
7136 | ||
7137 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7138 | { | |
521d6a73 PB |
7139 | WARN_ON_ONCE(sqd->thread == current); |
7140 | ||
09a6f4ef | 7141 | mutex_lock(&sqd->lock); |
05962f95 | 7142 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
e8f98f24 JA |
7143 | if (sqd->thread) |
7144 | wake_up_process(sqd->thread); | |
09a6f4ef | 7145 | mutex_unlock(&sqd->lock); |
05962f95 | 7146 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7147 | } |
7148 | ||
534ca6d6 | 7149 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7150 | { |
534ca6d6 | 7151 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7152 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7153 | ||
37d1e2e3 JA |
7154 | io_sq_thread_stop(sqd); |
7155 | kfree(sqd); | |
7156 | } | |
7157 | } | |
7158 | ||
7159 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7160 | { | |
7161 | struct io_sq_data *sqd = ctx->sq_data; | |
7162 | ||
7163 | if (sqd) { | |
05962f95 | 7164 | io_sq_thread_park(sqd); |
521d6a73 | 7165 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7166 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7167 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7168 | |
7169 | io_put_sq_data(sqd); | |
7170 | ctx->sq_data = NULL; | |
7c30f36a SM |
7171 | if (ctx->sq_creds) |
7172 | put_cred(ctx->sq_creds); | |
534ca6d6 JA |
7173 | } |
7174 | } | |
7175 | ||
aa06165d JA |
7176 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7177 | { | |
7178 | struct io_ring_ctx *ctx_attach; | |
7179 | struct io_sq_data *sqd; | |
7180 | struct fd f; | |
7181 | ||
7182 | f = fdget(p->wq_fd); | |
7183 | if (!f.file) | |
7184 | return ERR_PTR(-ENXIO); | |
7185 | if (f.file->f_op != &io_uring_fops) { | |
7186 | fdput(f); | |
7187 | return ERR_PTR(-EINVAL); | |
7188 | } | |
7189 | ||
7190 | ctx_attach = f.file->private_data; | |
7191 | sqd = ctx_attach->sq_data; | |
7192 | if (!sqd) { | |
7193 | fdput(f); | |
7194 | return ERR_PTR(-EINVAL); | |
7195 | } | |
5c2469e0 JA |
7196 | if (sqd->task_tgid != current->tgid) { |
7197 | fdput(f); | |
7198 | return ERR_PTR(-EPERM); | |
7199 | } | |
aa06165d JA |
7200 | |
7201 | refcount_inc(&sqd->refs); | |
7202 | fdput(f); | |
7203 | return sqd; | |
7204 | } | |
7205 | ||
26984fbf PB |
7206 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7207 | bool *attached) | |
534ca6d6 JA |
7208 | { |
7209 | struct io_sq_data *sqd; | |
7210 | ||
26984fbf | 7211 | *attached = false; |
5c2469e0 JA |
7212 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7213 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7214 | if (!IS_ERR(sqd)) { |
7215 | *attached = true; | |
5c2469e0 | 7216 | return sqd; |
26984fbf | 7217 | } |
5c2469e0 JA |
7218 | /* fall through for EPERM case, setup new sqd/task */ |
7219 | if (PTR_ERR(sqd) != -EPERM) | |
7220 | return sqd; | |
7221 | } | |
aa06165d | 7222 | |
534ca6d6 JA |
7223 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7224 | if (!sqd) | |
7225 | return ERR_PTR(-ENOMEM); | |
7226 | ||
9e138a48 | 7227 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7228 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7229 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7230 | mutex_init(&sqd->lock); |
534ca6d6 | 7231 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7232 | init_completion(&sqd->exited); |
534ca6d6 JA |
7233 | return sqd; |
7234 | } | |
7235 | ||
6b06314c | 7236 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7237 | /* |
7238 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7239 | * the io_uring can be safely unregistered on process exit, even if we have | |
7240 | * loops in the file referencing. | |
7241 | */ | |
7242 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7243 | { | |
7244 | struct sock *sk = ctx->ring_sock->sk; | |
7245 | struct scm_fp_list *fpl; | |
7246 | struct sk_buff *skb; | |
08a45173 | 7247 | int i, nr_files; |
6b06314c | 7248 | |
6b06314c JA |
7249 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7250 | if (!fpl) | |
7251 | return -ENOMEM; | |
7252 | ||
7253 | skb = alloc_skb(0, GFP_KERNEL); | |
7254 | if (!skb) { | |
7255 | kfree(fpl); | |
7256 | return -ENOMEM; | |
7257 | } | |
7258 | ||
7259 | skb->sk = sk; | |
6b06314c | 7260 | |
08a45173 | 7261 | nr_files = 0; |
62e398be | 7262 | fpl->user = get_uid(current_user()); |
6b06314c | 7263 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7264 | struct file *file = io_file_from_index(ctx, i + offset); |
7265 | ||
7266 | if (!file) | |
08a45173 | 7267 | continue; |
65e19f54 | 7268 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7269 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7270 | nr_files++; | |
6b06314c JA |
7271 | } |
7272 | ||
08a45173 JA |
7273 | if (nr_files) { |
7274 | fpl->max = SCM_MAX_FD; | |
7275 | fpl->count = nr_files; | |
7276 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7277 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7278 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7279 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7280 | |
08a45173 JA |
7281 | for (i = 0; i < nr_files; i++) |
7282 | fput(fpl->fp[i]); | |
7283 | } else { | |
7284 | kfree_skb(skb); | |
7285 | kfree(fpl); | |
7286 | } | |
6b06314c JA |
7287 | |
7288 | return 0; | |
7289 | } | |
7290 | ||
7291 | /* | |
7292 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7293 | * causes regular reference counting to break down. We rely on the UNIX | |
7294 | * garbage collection to take care of this problem for us. | |
7295 | */ | |
7296 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7297 | { | |
7298 | unsigned left, total; | |
7299 | int ret = 0; | |
7300 | ||
7301 | total = 0; | |
7302 | left = ctx->nr_user_files; | |
7303 | while (left) { | |
7304 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7305 | |
7306 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7307 | if (ret) | |
7308 | break; | |
7309 | left -= this_files; | |
7310 | total += this_files; | |
7311 | } | |
7312 | ||
7313 | if (!ret) | |
7314 | return 0; | |
7315 | ||
7316 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7317 | struct file *file = io_file_from_index(ctx, total); |
7318 | ||
7319 | if (file) | |
7320 | fput(file); | |
6b06314c JA |
7321 | total++; |
7322 | } | |
7323 | ||
7324 | return ret; | |
7325 | } | |
7326 | #else | |
7327 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7328 | { | |
7329 | return 0; | |
7330 | } | |
7331 | #endif | |
7332 | ||
269bbe5f | 7333 | static int io_sqe_alloc_file_tables(struct fixed_rsrc_data *file_data, |
5398ae69 | 7334 | unsigned nr_tables, unsigned nr_files) |
65e19f54 JA |
7335 | { |
7336 | int i; | |
7337 | ||
7338 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7339 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7340 | unsigned this_files; |
7341 | ||
7342 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7343 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7344 | GFP_KERNEL); | |
7345 | if (!table->files) | |
7346 | break; | |
7347 | nr_files -= this_files; | |
7348 | } | |
7349 | ||
7350 | if (i == nr_tables) | |
7351 | return 0; | |
7352 | ||
7353 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7354 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7355 | kfree(table->files); |
7356 | } | |
7357 | return 1; | |
7358 | } | |
7359 | ||
50238531 | 7360 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7361 | { |
50238531 | 7362 | struct file *file = prsrc->file; |
05f3fb3c JA |
7363 | #if defined(CONFIG_UNIX) |
7364 | struct sock *sock = ctx->ring_sock->sk; | |
7365 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7366 | struct sk_buff *skb; | |
7367 | int i; | |
7368 | ||
7369 | __skb_queue_head_init(&list); | |
7370 | ||
7371 | /* | |
7372 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7373 | * remove this entry and rearrange the file array. | |
7374 | */ | |
7375 | skb = skb_dequeue(head); | |
7376 | while (skb) { | |
7377 | struct scm_fp_list *fp; | |
7378 | ||
7379 | fp = UNIXCB(skb).fp; | |
7380 | for (i = 0; i < fp->count; i++) { | |
7381 | int left; | |
7382 | ||
7383 | if (fp->fp[i] != file) | |
7384 | continue; | |
7385 | ||
7386 | unix_notinflight(fp->user, fp->fp[i]); | |
7387 | left = fp->count - 1 - i; | |
7388 | if (left) { | |
7389 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7390 | left * sizeof(struct file *)); | |
7391 | } | |
7392 | fp->count--; | |
7393 | if (!fp->count) { | |
7394 | kfree_skb(skb); | |
7395 | skb = NULL; | |
7396 | } else { | |
7397 | __skb_queue_tail(&list, skb); | |
7398 | } | |
7399 | fput(file); | |
7400 | file = NULL; | |
7401 | break; | |
7402 | } | |
7403 | ||
7404 | if (!file) | |
7405 | break; | |
7406 | ||
7407 | __skb_queue_tail(&list, skb); | |
7408 | ||
7409 | skb = skb_dequeue(head); | |
7410 | } | |
7411 | ||
7412 | if (skb_peek(&list)) { | |
7413 | spin_lock_irq(&head->lock); | |
7414 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7415 | __skb_queue_tail(head, skb); | |
7416 | spin_unlock_irq(&head->lock); | |
7417 | } | |
7418 | #else | |
7419 | fput(file); | |
7420 | #endif | |
7421 | } | |
7422 | ||
269bbe5f | 7423 | static void __io_rsrc_put_work(struct fixed_rsrc_ref_node *ref_node) |
65e19f54 | 7424 | { |
269bbe5f BM |
7425 | struct fixed_rsrc_data *rsrc_data = ref_node->rsrc_data; |
7426 | struct io_ring_ctx *ctx = rsrc_data->ctx; | |
7427 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7428 | |
269bbe5f BM |
7429 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7430 | list_del(&prsrc->list); | |
50238531 | 7431 | ref_node->rsrc_put(ctx, prsrc); |
269bbe5f | 7432 | kfree(prsrc); |
65e19f54 | 7433 | } |
05589553 | 7434 | |
05589553 XW |
7435 | percpu_ref_exit(&ref_node->refs); |
7436 | kfree(ref_node); | |
269bbe5f | 7437 | percpu_ref_put(&rsrc_data->refs); |
2faf852d | 7438 | } |
65e19f54 | 7439 | |
269bbe5f | 7440 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7441 | { |
7442 | struct io_ring_ctx *ctx; | |
7443 | struct llist_node *node; | |
7444 | ||
269bbe5f BM |
7445 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7446 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7447 | |
7448 | while (node) { | |
269bbe5f | 7449 | struct fixed_rsrc_ref_node *ref_node; |
4a38aed2 JA |
7450 | struct llist_node *next = node->next; |
7451 | ||
269bbe5f BM |
7452 | ref_node = llist_entry(node, struct fixed_rsrc_ref_node, llist); |
7453 | __io_rsrc_put_work(ref_node); | |
4a38aed2 JA |
7454 | node = next; |
7455 | } | |
7456 | } | |
7457 | ||
00835dce | 7458 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
2faf852d | 7459 | { |
269bbe5f BM |
7460 | struct fixed_rsrc_ref_node *ref_node; |
7461 | struct fixed_rsrc_data *data; | |
4a38aed2 | 7462 | struct io_ring_ctx *ctx; |
e297822b | 7463 | bool first_add = false; |
4a38aed2 | 7464 | int delay = HZ; |
65e19f54 | 7465 | |
269bbe5f BM |
7466 | ref_node = container_of(ref, struct fixed_rsrc_ref_node, refs); |
7467 | data = ref_node->rsrc_data; | |
e297822b PB |
7468 | ctx = data->ctx; |
7469 | ||
2a63b2d9 | 7470 | io_rsrc_ref_lock(ctx); |
e297822b PB |
7471 | ref_node->done = true; |
7472 | ||
d67d2263 BM |
7473 | while (!list_empty(&ctx->rsrc_ref_list)) { |
7474 | ref_node = list_first_entry(&ctx->rsrc_ref_list, | |
269bbe5f | 7475 | struct fixed_rsrc_ref_node, node); |
e297822b PB |
7476 | /* recycle ref nodes in order */ |
7477 | if (!ref_node->done) | |
7478 | break; | |
7479 | list_del(&ref_node->node); | |
269bbe5f | 7480 | first_add |= llist_add(&ref_node->llist, &ctx->rsrc_put_llist); |
e297822b | 7481 | } |
2a63b2d9 | 7482 | io_rsrc_ref_unlock(ctx); |
05589553 | 7483 | |
e297822b | 7484 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7485 | delay = 0; |
05589553 | 7486 | |
4a38aed2 | 7487 | if (!delay) |
269bbe5f | 7488 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, 0); |
4a38aed2 | 7489 | else if (first_add) |
269bbe5f | 7490 | queue_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
05f3fb3c | 7491 | } |
65e19f54 | 7492 | |
6802535d | 7493 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
05589553 | 7494 | struct io_ring_ctx *ctx) |
05f3fb3c | 7495 | { |
269bbe5f | 7496 | struct fixed_rsrc_ref_node *ref_node; |
05f3fb3c | 7497 | |
05589553 XW |
7498 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7499 | if (!ref_node) | |
3e2224c5 | 7500 | return NULL; |
05f3fb3c | 7501 | |
00835dce | 7502 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
05589553 XW |
7503 | 0, GFP_KERNEL)) { |
7504 | kfree(ref_node); | |
3e2224c5 | 7505 | return NULL; |
05589553 XW |
7506 | } |
7507 | INIT_LIST_HEAD(&ref_node->node); | |
269bbe5f | 7508 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
e297822b | 7509 | ref_node->done = false; |
05589553 | 7510 | return ref_node; |
05589553 XW |
7511 | } |
7512 | ||
bc9744cd PB |
7513 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
7514 | struct fixed_rsrc_ref_node *ref_node) | |
6802535d | 7515 | { |
269bbe5f | 7516 | ref_node->rsrc_data = ctx->file_data; |
50238531 | 7517 | ref_node->rsrc_put = io_ring_file_put; |
05589553 XW |
7518 | } |
7519 | ||
269bbe5f | 7520 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node) |
05589553 XW |
7521 | { |
7522 | percpu_ref_exit(&ref_node->refs); | |
7523 | kfree(ref_node); | |
65e19f54 JA |
7524 | } |
7525 | ||
ea64ec02 | 7526 | |
6b06314c JA |
7527 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7528 | unsigned nr_args) | |
7529 | { | |
7530 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7531 | unsigned nr_tables, i; |
05f3fb3c | 7532 | struct file *file; |
600cf3f8 | 7533 | int fd, ret = -ENOMEM; |
269bbe5f BM |
7534 | struct fixed_rsrc_ref_node *ref_node; |
7535 | struct fixed_rsrc_data *file_data; | |
6b06314c | 7536 | |
05f3fb3c | 7537 | if (ctx->file_data) |
6b06314c JA |
7538 | return -EBUSY; |
7539 | if (!nr_args) | |
7540 | return -EINVAL; | |
7541 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7542 | return -EMFILE; | |
7543 | ||
1ad555c6 | 7544 | file_data = alloc_fixed_rsrc_data(ctx); |
5398ae69 | 7545 | if (!file_data) |
05f3fb3c | 7546 | return -ENOMEM; |
13770a71 | 7547 | ctx->file_data = file_data; |
05f3fb3c | 7548 | |
65e19f54 | 7549 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7550 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7551 | GFP_KERNEL); |
600cf3f8 PB |
7552 | if (!file_data->table) |
7553 | goto out_free; | |
05f3fb3c | 7554 | |
600cf3f8 | 7555 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
1ad555c6 | 7556 | goto out_free; |
65e19f54 | 7557 | |
08a45173 | 7558 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
7b29f92d JA |
7559 | unsigned long file_ptr; |
7560 | ||
600cf3f8 PB |
7561 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7562 | ret = -EFAULT; | |
7563 | goto out_fput; | |
7564 | } | |
08a45173 | 7565 | /* allow sparse sets */ |
600cf3f8 | 7566 | if (fd == -1) |
08a45173 | 7567 | continue; |
6b06314c | 7568 | |
05f3fb3c | 7569 | file = fget(fd); |
6b06314c | 7570 | ret = -EBADF; |
05f3fb3c | 7571 | if (!file) |
600cf3f8 | 7572 | goto out_fput; |
05f3fb3c | 7573 | |
6b06314c JA |
7574 | /* |
7575 | * Don't allow io_uring instances to be registered. If UNIX | |
7576 | * isn't enabled, then this causes a reference cycle and this | |
7577 | * instance can never get freed. If UNIX is enabled we'll | |
7578 | * handle it just fine, but there's still no point in allowing | |
7579 | * a ring fd as it doesn't support regular read/write anyway. | |
7580 | */ | |
05f3fb3c JA |
7581 | if (file->f_op == &io_uring_fops) { |
7582 | fput(file); | |
600cf3f8 | 7583 | goto out_fput; |
6b06314c | 7584 | } |
7b29f92d JA |
7585 | file_ptr = (unsigned long) file; |
7586 | if (__io_file_supports_async(file, READ)) | |
7587 | file_ptr |= FFS_ASYNC_READ; | |
7588 | if (__io_file_supports_async(file, WRITE)) | |
7589 | file_ptr |= FFS_ASYNC_WRITE; | |
7590 | if (S_ISREG(file_inode(file)->i_mode)) | |
7591 | file_ptr |= FFS_ISREG; | |
7592 | *io_fixed_file_slot(file_data, i) = (struct file *) file_ptr; | |
6b06314c JA |
7593 | } |
7594 | ||
6b06314c | 7595 | ret = io_sqe_files_scm(ctx); |
05589553 | 7596 | if (ret) { |
6b06314c | 7597 | io_sqe_files_unregister(ctx); |
05589553 XW |
7598 | return ret; |
7599 | } | |
6b06314c | 7600 | |
bc9744cd | 7601 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 | 7602 | if (!ref_node) { |
05589553 | 7603 | io_sqe_files_unregister(ctx); |
3e2224c5 | 7604 | return -ENOMEM; |
05589553 | 7605 | } |
bc9744cd | 7606 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 7607 | |
d67d2263 | 7608 | io_sqe_rsrc_set_node(ctx, file_data, ref_node); |
6b06314c | 7609 | return ret; |
600cf3f8 PB |
7610 | out_fput: |
7611 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7612 | file = io_file_from_index(ctx, i); | |
7613 | if (file) | |
7614 | fput(file); | |
7615 | } | |
7616 | for (i = 0; i < nr_tables; i++) | |
7617 | kfree(file_data->table[i].files); | |
7618 | ctx->nr_user_files = 0; | |
600cf3f8 | 7619 | out_free: |
1ad555c6 | 7620 | free_fixed_rsrc_data(ctx->file_data); |
55cbc256 | 7621 | ctx->file_data = NULL; |
6b06314c JA |
7622 | return ret; |
7623 | } | |
7624 | ||
c3a31e60 JA |
7625 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7626 | int index) | |
7627 | { | |
7628 | #if defined(CONFIG_UNIX) | |
7629 | struct sock *sock = ctx->ring_sock->sk; | |
7630 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7631 | struct sk_buff *skb; | |
7632 | ||
7633 | /* | |
7634 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7635 | * file set. If there's no room, fall back to allocating a new skb | |
7636 | * and filling it in. | |
7637 | */ | |
7638 | spin_lock_irq(&head->lock); | |
7639 | skb = skb_peek(head); | |
7640 | if (skb) { | |
7641 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7642 | ||
7643 | if (fpl->count < SCM_MAX_FD) { | |
7644 | __skb_unlink(skb, head); | |
7645 | spin_unlock_irq(&head->lock); | |
7646 | fpl->fp[fpl->count] = get_file(file); | |
7647 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7648 | fpl->count++; | |
7649 | spin_lock_irq(&head->lock); | |
7650 | __skb_queue_head(head, skb); | |
7651 | } else { | |
7652 | skb = NULL; | |
7653 | } | |
7654 | } | |
7655 | spin_unlock_irq(&head->lock); | |
7656 | ||
7657 | if (skb) { | |
7658 | fput(file); | |
7659 | return 0; | |
7660 | } | |
7661 | ||
7662 | return __io_sqe_files_scm(ctx, 1, index); | |
7663 | #else | |
7664 | return 0; | |
7665 | #endif | |
7666 | } | |
7667 | ||
50238531 | 7668 | static int io_queue_rsrc_removal(struct fixed_rsrc_data *data, void *rsrc) |
05f3fb3c | 7669 | { |
269bbe5f BM |
7670 | struct io_rsrc_put *prsrc; |
7671 | struct fixed_rsrc_ref_node *ref_node = data->node; | |
05f3fb3c | 7672 | |
269bbe5f BM |
7673 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
7674 | if (!prsrc) | |
a5318d3c | 7675 | return -ENOMEM; |
05f3fb3c | 7676 | |
50238531 | 7677 | prsrc->rsrc = rsrc; |
269bbe5f | 7678 | list_add(&prsrc->list, &ref_node->rsrc_list); |
05589553 | 7679 | |
a5318d3c | 7680 | return 0; |
05f3fb3c JA |
7681 | } |
7682 | ||
269bbe5f BM |
7683 | static inline int io_queue_file_removal(struct fixed_rsrc_data *data, |
7684 | struct file *file) | |
7685 | { | |
50238531 | 7686 | return io_queue_rsrc_removal(data, (void *)file); |
269bbe5f BM |
7687 | } |
7688 | ||
05f3fb3c | 7689 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 7690 | struct io_uring_rsrc_update *up, |
05f3fb3c JA |
7691 | unsigned nr_args) |
7692 | { | |
269bbe5f BM |
7693 | struct fixed_rsrc_data *data = ctx->file_data; |
7694 | struct fixed_rsrc_ref_node *ref_node; | |
ea64ec02 | 7695 | struct file *file, **file_slot; |
c3a31e60 JA |
7696 | __s32 __user *fds; |
7697 | int fd, i, err; | |
7698 | __u32 done; | |
05589553 | 7699 | bool needs_switch = false; |
c3a31e60 | 7700 | |
05f3fb3c | 7701 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7702 | return -EOVERFLOW; |
7703 | if (done > ctx->nr_user_files) | |
7704 | return -EINVAL; | |
8dd03afe PB |
7705 | err = io_rsrc_refnode_prealloc(ctx); |
7706 | if (err) | |
7707 | return err; | |
05589553 | 7708 | |
269bbe5f | 7709 | fds = u64_to_user_ptr(up->data); |
67973b93 | 7710 | for (done = 0; done < nr_args; done++) { |
c3a31e60 JA |
7711 | err = 0; |
7712 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7713 | err = -EFAULT; | |
7714 | break; | |
7715 | } | |
4e0377a1 | 7716 | if (fd == IORING_REGISTER_FILES_SKIP) |
7717 | continue; | |
7718 | ||
67973b93 | 7719 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
ea64ec02 PB |
7720 | file_slot = io_fixed_file_slot(ctx->file_data, i); |
7721 | ||
7722 | if (*file_slot) { | |
7b29f92d JA |
7723 | file = (struct file *) ((unsigned long) *file_slot & FFS_MASK); |
7724 | err = io_queue_file_removal(data, file); | |
a5318d3c HD |
7725 | if (err) |
7726 | break; | |
ea64ec02 | 7727 | *file_slot = NULL; |
05589553 | 7728 | needs_switch = true; |
c3a31e60 JA |
7729 | } |
7730 | if (fd != -1) { | |
c3a31e60 JA |
7731 | file = fget(fd); |
7732 | if (!file) { | |
7733 | err = -EBADF; | |
7734 | break; | |
7735 | } | |
7736 | /* | |
7737 | * Don't allow io_uring instances to be registered. If | |
7738 | * UNIX isn't enabled, then this causes a reference | |
7739 | * cycle and this instance can never get freed. If UNIX | |
7740 | * is enabled we'll handle it just fine, but there's | |
7741 | * still no point in allowing a ring fd as it doesn't | |
7742 | * support regular read/write anyway. | |
7743 | */ | |
7744 | if (file->f_op == &io_uring_fops) { | |
7745 | fput(file); | |
7746 | err = -EBADF; | |
7747 | break; | |
7748 | } | |
e68a3ff8 | 7749 | *file_slot = file; |
c3a31e60 | 7750 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7751 | if (err) { |
e68a3ff8 | 7752 | *file_slot = NULL; |
f3bd9dae | 7753 | fput(file); |
c3a31e60 | 7754 | break; |
f3bd9dae | 7755 | } |
c3a31e60 | 7756 | } |
05f3fb3c JA |
7757 | } |
7758 | ||
05589553 | 7759 | if (needs_switch) { |
b2e96852 | 7760 | percpu_ref_kill(&data->node->refs); |
8dd03afe | 7761 | ref_node = io_rsrc_refnode_get(ctx, data, io_ring_file_put); |
d67d2263 | 7762 | io_sqe_rsrc_set_node(ctx, data, ref_node); |
8dd03afe | 7763 | } |
c3a31e60 JA |
7764 | return done ? done : err; |
7765 | } | |
05589553 | 7766 | |
05f3fb3c JA |
7767 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7768 | unsigned nr_args) | |
7769 | { | |
269bbe5f | 7770 | struct io_uring_rsrc_update up; |
05f3fb3c JA |
7771 | |
7772 | if (!ctx->file_data) | |
7773 | return -ENXIO; | |
7774 | if (!nr_args) | |
7775 | return -EINVAL; | |
7776 | if (copy_from_user(&up, arg, sizeof(up))) | |
7777 | return -EFAULT; | |
7778 | if (up.resv) | |
7779 | return -EINVAL; | |
7780 | ||
7781 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7782 | } | |
c3a31e60 | 7783 | |
5280f7e5 | 7784 | static struct io_wq_work *io_free_work(struct io_wq_work *work) |
7d723065 JA |
7785 | { |
7786 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7787 | ||
5280f7e5 PB |
7788 | req = io_put_req_find_next(req); |
7789 | return req ? &req->work : NULL; | |
7d723065 JA |
7790 | } |
7791 | ||
5aa75ed5 | 7792 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx) |
24369c2e | 7793 | { |
e941894e | 7794 | struct io_wq_hash *hash; |
24369c2e | 7795 | struct io_wq_data data; |
24369c2e | 7796 | unsigned int concurrency; |
24369c2e | 7797 | |
e941894e JA |
7798 | hash = ctx->hash_map; |
7799 | if (!hash) { | |
7800 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
7801 | if (!hash) | |
7802 | return ERR_PTR(-ENOMEM); | |
7803 | refcount_set(&hash->refs, 1); | |
7804 | init_waitqueue_head(&hash->wait); | |
7805 | ctx->hash_map = hash; | |
24369c2e PB |
7806 | } |
7807 | ||
e941894e | 7808 | data.hash = hash; |
e9fd9396 | 7809 | data.free_work = io_free_work; |
f5fa38c5 | 7810 | data.do_work = io_wq_submit_work; |
24369c2e | 7811 | |
d25e3a3d JA |
7812 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
7813 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 7814 | |
5aa75ed5 | 7815 | return io_wq_create(concurrency, &data); |
24369c2e PB |
7816 | } |
7817 | ||
5aa75ed5 JA |
7818 | static int io_uring_alloc_task_context(struct task_struct *task, |
7819 | struct io_ring_ctx *ctx) | |
0f212204 JA |
7820 | { |
7821 | struct io_uring_task *tctx; | |
d8a6df10 | 7822 | int ret; |
0f212204 JA |
7823 | |
7824 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7825 | if (unlikely(!tctx)) | |
7826 | return -ENOMEM; | |
7827 | ||
d8a6df10 JA |
7828 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7829 | if (unlikely(ret)) { | |
7830 | kfree(tctx); | |
7831 | return ret; | |
7832 | } | |
7833 | ||
5aa75ed5 JA |
7834 | tctx->io_wq = io_init_wq_offload(ctx); |
7835 | if (IS_ERR(tctx->io_wq)) { | |
7836 | ret = PTR_ERR(tctx->io_wq); | |
7837 | percpu_counter_destroy(&tctx->inflight); | |
7838 | kfree(tctx); | |
7839 | return ret; | |
7840 | } | |
7841 | ||
0f212204 JA |
7842 | xa_init(&tctx->xa); |
7843 | init_waitqueue_head(&tctx->wait); | |
7844 | tctx->last = NULL; | |
fdaf083c | 7845 | atomic_set(&tctx->in_idle, 0); |
0f212204 | 7846 | task->io_uring = tctx; |
7cbf1722 JA |
7847 | spin_lock_init(&tctx->task_lock); |
7848 | INIT_WQ_LIST(&tctx->task_list); | |
7849 | tctx->task_state = 0; | |
7850 | init_task_work(&tctx->task_work, tctx_task_work); | |
0f212204 JA |
7851 | return 0; |
7852 | } | |
7853 | ||
7854 | void __io_uring_free(struct task_struct *tsk) | |
7855 | { | |
7856 | struct io_uring_task *tctx = tsk->io_uring; | |
7857 | ||
7858 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e PB |
7859 | WARN_ON_ONCE(tctx->io_wq); |
7860 | ||
d8a6df10 | 7861 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
7862 | kfree(tctx); |
7863 | tsk->io_uring = NULL; | |
7864 | } | |
7865 | ||
7e84e1c7 SG |
7866 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
7867 | struct io_uring_params *p) | |
2b188cc1 JA |
7868 | { |
7869 | int ret; | |
7870 | ||
d25e3a3d JA |
7871 | /* Retain compatibility with failing for an invalid attach attempt */ |
7872 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
7873 | IORING_SETUP_ATTACH_WQ) { | |
7874 | struct fd f; | |
7875 | ||
7876 | f = fdget(p->wq_fd); | |
7877 | if (!f.file) | |
7878 | return -ENXIO; | |
7879 | if (f.file->f_op != &io_uring_fops) { | |
7880 | fdput(f); | |
7881 | return -EINVAL; | |
7882 | } | |
7883 | fdput(f); | |
7884 | } | |
6c271ce2 | 7885 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 7886 | struct task_struct *tsk; |
534ca6d6 | 7887 | struct io_sq_data *sqd; |
26984fbf | 7888 | bool attached; |
534ca6d6 | 7889 | |
3ec482d1 | 7890 | ret = -EPERM; |
ce59fc69 | 7891 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
7892 | goto err; |
7893 | ||
26984fbf | 7894 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
7895 | if (IS_ERR(sqd)) { |
7896 | ret = PTR_ERR(sqd); | |
7897 | goto err; | |
7898 | } | |
69fb2131 | 7899 | |
7c30f36a | 7900 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 7901 | ctx->sq_data = sqd; |
917257da JA |
7902 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7903 | if (!ctx->sq_thread_idle) | |
7904 | ctx->sq_thread_idle = HZ; | |
7905 | ||
26984fbf | 7906 | ret = 0; |
78d7f6ba | 7907 | io_sq_thread_park(sqd); |
de75a3d3 PB |
7908 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
7909 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 7910 | /* don't attach to a dying SQPOLL thread, would be racy */ |
de75a3d3 | 7911 | if (attached && !sqd->thread) |
26984fbf | 7912 | ret = -ENXIO; |
78d7f6ba PB |
7913 | io_sq_thread_unpark(sqd); |
7914 | ||
de75a3d3 PB |
7915 | if (ret < 0) |
7916 | goto err; | |
7917 | if (attached) | |
5aa75ed5 | 7918 | return 0; |
aa06165d | 7919 | |
6c271ce2 | 7920 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7921 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7922 | |
917257da | 7923 | ret = -EINVAL; |
44a9bd18 | 7924 | if (cpu >= nr_cpu_ids) |
e8f98f24 | 7925 | goto err_sqpoll; |
7889f44d | 7926 | if (!cpu_online(cpu)) |
e8f98f24 | 7927 | goto err_sqpoll; |
917257da | 7928 | |
37d1e2e3 | 7929 | sqd->sq_cpu = cpu; |
6c271ce2 | 7930 | } else { |
37d1e2e3 | 7931 | sqd->sq_cpu = -1; |
6c271ce2 | 7932 | } |
37d1e2e3 JA |
7933 | |
7934 | sqd->task_pid = current->pid; | |
5c2469e0 | 7935 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
7936 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
7937 | if (IS_ERR(tsk)) { | |
7938 | ret = PTR_ERR(tsk); | |
e8f98f24 | 7939 | goto err_sqpoll; |
6c271ce2 | 7940 | } |
97a73a0f | 7941 | |
46fe18b1 | 7942 | sqd->thread = tsk; |
97a73a0f | 7943 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 7944 | wake_up_new_task(tsk); |
0f212204 JA |
7945 | if (ret) |
7946 | goto err; | |
6c271ce2 JA |
7947 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
7948 | /* Can't have SQ_AFF without SQPOLL */ | |
7949 | ret = -EINVAL; | |
7950 | goto err; | |
7951 | } | |
7952 | ||
2b188cc1 JA |
7953 | return 0; |
7954 | err: | |
37d1e2e3 | 7955 | io_sq_thread_finish(ctx); |
2b188cc1 | 7956 | return ret; |
e8f98f24 JA |
7957 | err_sqpoll: |
7958 | complete(&ctx->sq_data->exited); | |
7959 | goto err; | |
2b188cc1 JA |
7960 | } |
7961 | ||
a087e2b5 BM |
7962 | static inline void __io_unaccount_mem(struct user_struct *user, |
7963 | unsigned long nr_pages) | |
2b188cc1 JA |
7964 | { |
7965 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7966 | } | |
7967 | ||
a087e2b5 BM |
7968 | static inline int __io_account_mem(struct user_struct *user, |
7969 | unsigned long nr_pages) | |
2b188cc1 JA |
7970 | { |
7971 | unsigned long page_limit, cur_pages, new_pages; | |
7972 | ||
7973 | /* Don't allow more pages than we can safely lock */ | |
7974 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7975 | ||
7976 | do { | |
7977 | cur_pages = atomic_long_read(&user->locked_vm); | |
7978 | new_pages = cur_pages + nr_pages; | |
7979 | if (new_pages > page_limit) | |
7980 | return -ENOMEM; | |
7981 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7982 | new_pages) != cur_pages); | |
7983 | ||
7984 | return 0; | |
7985 | } | |
7986 | ||
26bfa89e | 7987 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 7988 | { |
62e398be | 7989 | if (ctx->user) |
a087e2b5 | 7990 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7991 | |
26bfa89e JA |
7992 | if (ctx->mm_account) |
7993 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
7994 | } |
7995 | ||
26bfa89e | 7996 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 7997 | { |
30975825 BM |
7998 | int ret; |
7999 | ||
62e398be | 8000 | if (ctx->user) { |
30975825 BM |
8001 | ret = __io_account_mem(ctx->user, nr_pages); |
8002 | if (ret) | |
8003 | return ret; | |
8004 | } | |
8005 | ||
26bfa89e JA |
8006 | if (ctx->mm_account) |
8007 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8008 | |
8009 | return 0; | |
8010 | } | |
8011 | ||
2b188cc1 JA |
8012 | static void io_mem_free(void *ptr) |
8013 | { | |
52e04ef4 MR |
8014 | struct page *page; |
8015 | ||
8016 | if (!ptr) | |
8017 | return; | |
2b188cc1 | 8018 | |
52e04ef4 | 8019 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8020 | if (put_page_testzero(page)) |
8021 | free_compound_page(page); | |
8022 | } | |
8023 | ||
8024 | static void *io_mem_alloc(size_t size) | |
8025 | { | |
8026 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8027 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8028 | |
8029 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8030 | } | |
8031 | ||
75b28aff HV |
8032 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8033 | size_t *sq_offset) | |
8034 | { | |
8035 | struct io_rings *rings; | |
8036 | size_t off, sq_array_size; | |
8037 | ||
8038 | off = struct_size(rings, cqes, cq_entries); | |
8039 | if (off == SIZE_MAX) | |
8040 | return SIZE_MAX; | |
8041 | ||
8042 | #ifdef CONFIG_SMP | |
8043 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8044 | if (off == 0) | |
8045 | return SIZE_MAX; | |
8046 | #endif | |
8047 | ||
b36200f5 DV |
8048 | if (sq_offset) |
8049 | *sq_offset = off; | |
8050 | ||
75b28aff HV |
8051 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8052 | if (sq_array_size == SIZE_MAX) | |
8053 | return SIZE_MAX; | |
8054 | ||
8055 | if (check_add_overflow(off, sq_array_size, &off)) | |
8056 | return SIZE_MAX; | |
8057 | ||
75b28aff HV |
8058 | return off; |
8059 | } | |
8060 | ||
0a96bbe4 | 8061 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee JA |
8062 | { |
8063 | int i, j; | |
8064 | ||
8065 | if (!ctx->user_bufs) | |
8066 | return -ENXIO; | |
8067 | ||
8068 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8069 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8070 | ||
8071 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8072 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8073 | |
de293938 | 8074 | if (imu->acct_pages) |
26bfa89e | 8075 | io_unaccount_mem(ctx, imu->acct_pages); |
d4ef6475 | 8076 | kvfree(imu->bvec); |
edafccee JA |
8077 | imu->nr_bvecs = 0; |
8078 | } | |
8079 | ||
8080 | kfree(ctx->user_bufs); | |
8081 | ctx->user_bufs = NULL; | |
8082 | ctx->nr_user_bufs = 0; | |
8083 | return 0; | |
8084 | } | |
8085 | ||
8086 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8087 | void __user *arg, unsigned index) | |
8088 | { | |
8089 | struct iovec __user *src; | |
8090 | ||
8091 | #ifdef CONFIG_COMPAT | |
8092 | if (ctx->compat) { | |
8093 | struct compat_iovec __user *ciovs; | |
8094 | struct compat_iovec ciov; | |
8095 | ||
8096 | ciovs = (struct compat_iovec __user *) arg; | |
8097 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8098 | return -EFAULT; | |
8099 | ||
d55e5f5b | 8100 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8101 | dst->iov_len = ciov.iov_len; |
8102 | return 0; | |
8103 | } | |
8104 | #endif | |
8105 | src = (struct iovec __user *) arg; | |
8106 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8107 | return -EFAULT; | |
8108 | return 0; | |
8109 | } | |
8110 | ||
de293938 JA |
8111 | /* |
8112 | * Not super efficient, but this is just a registration time. And we do cache | |
8113 | * the last compound head, so generally we'll only do a full search if we don't | |
8114 | * match that one. | |
8115 | * | |
8116 | * We check if the given compound head page has already been accounted, to | |
8117 | * avoid double accounting it. This allows us to account the full size of the | |
8118 | * page, not just the constituent pages of a huge page. | |
8119 | */ | |
8120 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8121 | int nr_pages, struct page *hpage) | |
8122 | { | |
8123 | int i, j; | |
8124 | ||
8125 | /* check current page array */ | |
8126 | for (i = 0; i < nr_pages; i++) { | |
8127 | if (!PageCompound(pages[i])) | |
8128 | continue; | |
8129 | if (compound_head(pages[i]) == hpage) | |
8130 | return true; | |
8131 | } | |
8132 | ||
8133 | /* check previously registered pages */ | |
8134 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8135 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8136 | ||
8137 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8138 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8139 | continue; | |
8140 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8141 | return true; | |
8142 | } | |
8143 | } | |
8144 | ||
8145 | return false; | |
8146 | } | |
8147 | ||
8148 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8149 | int nr_pages, struct io_mapped_ubuf *imu, | |
8150 | struct page **last_hpage) | |
8151 | { | |
8152 | int i, ret; | |
8153 | ||
8154 | for (i = 0; i < nr_pages; i++) { | |
8155 | if (!PageCompound(pages[i])) { | |
8156 | imu->acct_pages++; | |
8157 | } else { | |
8158 | struct page *hpage; | |
8159 | ||
8160 | hpage = compound_head(pages[i]); | |
8161 | if (hpage == *last_hpage) | |
8162 | continue; | |
8163 | *last_hpage = hpage; | |
8164 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8165 | continue; | |
8166 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8167 | } | |
8168 | } | |
8169 | ||
8170 | if (!imu->acct_pages) | |
8171 | return 0; | |
8172 | ||
26bfa89e | 8173 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8174 | if (ret) |
8175 | imu->acct_pages = 0; | |
8176 | return ret; | |
8177 | } | |
8178 | ||
0a96bbe4 BM |
8179 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
8180 | struct io_mapped_ubuf *imu, | |
8181 | struct page **last_hpage) | |
edafccee JA |
8182 | { |
8183 | struct vm_area_struct **vmas = NULL; | |
8184 | struct page **pages = NULL; | |
0a96bbe4 BM |
8185 | unsigned long off, start, end, ubuf; |
8186 | size_t size; | |
8187 | int ret, pret, nr_pages, i; | |
8188 | ||
8189 | ubuf = (unsigned long) iov->iov_base; | |
8190 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8191 | start = ubuf >> PAGE_SHIFT; | |
8192 | nr_pages = end - start; | |
8193 | ||
8194 | ret = -ENOMEM; | |
8195 | ||
8196 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8197 | if (!pages) | |
8198 | goto done; | |
8199 | ||
8200 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8201 | GFP_KERNEL); | |
8202 | if (!vmas) | |
8203 | goto done; | |
edafccee | 8204 | |
0a96bbe4 BM |
8205 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
8206 | GFP_KERNEL); | |
8207 | if (!imu->bvec) | |
8208 | goto done; | |
8209 | ||
8210 | ret = 0; | |
8211 | mmap_read_lock(current->mm); | |
8212 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8213 | pages, vmas); | |
8214 | if (pret == nr_pages) { | |
8215 | /* don't support file backed memory */ | |
8216 | for (i = 0; i < nr_pages; i++) { | |
8217 | struct vm_area_struct *vma = vmas[i]; | |
8218 | ||
8219 | if (vma->vm_file && | |
8220 | !is_file_hugepages(vma->vm_file)) { | |
8221 | ret = -EOPNOTSUPP; | |
8222 | break; | |
8223 | } | |
8224 | } | |
8225 | } else { | |
8226 | ret = pret < 0 ? pret : -EFAULT; | |
8227 | } | |
8228 | mmap_read_unlock(current->mm); | |
8229 | if (ret) { | |
8230 | /* | |
8231 | * if we did partial map, or found file backed vmas, | |
8232 | * release any pages we did get | |
8233 | */ | |
8234 | if (pret > 0) | |
8235 | unpin_user_pages(pages, pret); | |
8236 | kvfree(imu->bvec); | |
8237 | goto done; | |
8238 | } | |
8239 | ||
8240 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8241 | if (ret) { | |
8242 | unpin_user_pages(pages, pret); | |
8243 | kvfree(imu->bvec); | |
8244 | goto done; | |
8245 | } | |
8246 | ||
8247 | off = ubuf & ~PAGE_MASK; | |
8248 | size = iov->iov_len; | |
8249 | for (i = 0; i < nr_pages; i++) { | |
8250 | size_t vec_len; | |
8251 | ||
8252 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8253 | imu->bvec[i].bv_page = pages[i]; | |
8254 | imu->bvec[i].bv_len = vec_len; | |
8255 | imu->bvec[i].bv_offset = off; | |
8256 | off = 0; | |
8257 | size -= vec_len; | |
8258 | } | |
8259 | /* store original address for later verification */ | |
8260 | imu->ubuf = ubuf; | |
8261 | imu->len = iov->iov_len; | |
8262 | imu->nr_bvecs = nr_pages; | |
8263 | ret = 0; | |
8264 | done: | |
8265 | kvfree(pages); | |
8266 | kvfree(vmas); | |
8267 | return ret; | |
8268 | } | |
8269 | ||
2b358604 | 8270 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8271 | { |
edafccee JA |
8272 | if (ctx->user_bufs) |
8273 | return -EBUSY; | |
8274 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8275 | return -EINVAL; | |
8276 | ||
8277 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8278 | GFP_KERNEL); | |
8279 | if (!ctx->user_bufs) | |
8280 | return -ENOMEM; | |
8281 | ||
2b358604 BM |
8282 | return 0; |
8283 | } | |
edafccee | 8284 | |
2b358604 BM |
8285 | static int io_buffer_validate(struct iovec *iov) |
8286 | { | |
8287 | /* | |
8288 | * Don't impose further limits on the size and buffer | |
8289 | * constraints here, we'll -EINVAL later when IO is | |
8290 | * submitted if they are wrong. | |
8291 | */ | |
8292 | if (!iov->iov_base || !iov->iov_len) | |
8293 | return -EFAULT; | |
edafccee | 8294 | |
2b358604 BM |
8295 | /* arbitrary limit, but we need something */ |
8296 | if (iov->iov_len > SZ_1G) | |
8297 | return -EFAULT; | |
edafccee | 8298 | |
2b358604 BM |
8299 | return 0; |
8300 | } | |
edafccee | 8301 | |
2b358604 BM |
8302 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
8303 | unsigned int nr_args) | |
8304 | { | |
8305 | int i, ret; | |
8306 | struct iovec iov; | |
8307 | struct page *last_hpage = NULL; | |
edafccee | 8308 | |
2b358604 BM |
8309 | ret = io_buffers_map_alloc(ctx, nr_args); |
8310 | if (ret) | |
8311 | return ret; | |
edafccee | 8312 | |
edafccee JA |
8313 | for (i = 0; i < nr_args; i++) { |
8314 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
edafccee | 8315 | |
edafccee JA |
8316 | ret = io_copy_iov(ctx, &iov, arg, i); |
8317 | if (ret) | |
0a96bbe4 | 8318 | break; |
de293938 | 8319 | |
2b358604 BM |
8320 | ret = io_buffer_validate(&iov); |
8321 | if (ret) | |
0a96bbe4 | 8322 | break; |
edafccee | 8323 | |
0a96bbe4 BM |
8324 | ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage); |
8325 | if (ret) | |
8326 | break; | |
edafccee JA |
8327 | |
8328 | ctx->nr_user_bufs++; | |
8329 | } | |
0a96bbe4 BM |
8330 | |
8331 | if (ret) | |
8332 | io_sqe_buffers_unregister(ctx); | |
8333 | ||
edafccee JA |
8334 | return ret; |
8335 | } | |
8336 | ||
9b402849 JA |
8337 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8338 | { | |
8339 | __s32 __user *fds = arg; | |
8340 | int fd; | |
8341 | ||
8342 | if (ctx->cq_ev_fd) | |
8343 | return -EBUSY; | |
8344 | ||
8345 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8346 | return -EFAULT; | |
8347 | ||
8348 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8349 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8350 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8351 | ctx->cq_ev_fd = NULL; | |
8352 | return ret; | |
8353 | } | |
8354 | ||
8355 | return 0; | |
8356 | } | |
8357 | ||
8358 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8359 | { | |
8360 | if (ctx->cq_ev_fd) { | |
8361 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8362 | ctx->cq_ev_fd = NULL; | |
8363 | return 0; | |
8364 | } | |
8365 | ||
8366 | return -ENXIO; | |
8367 | } | |
8368 | ||
5a2e745d JA |
8369 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
8370 | { | |
9e15c3a0 JA |
8371 | struct io_buffer *buf; |
8372 | unsigned long index; | |
8373 | ||
8374 | xa_for_each(&ctx->io_buffers, index, buf) | |
8375 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
8376 | } |
8377 | ||
68e68ee6 | 8378 | static void io_req_cache_free(struct list_head *list, struct task_struct *tsk) |
1b4c351f | 8379 | { |
68e68ee6 | 8380 | struct io_kiocb *req, *nxt; |
1b4c351f | 8381 | |
68e68ee6 JA |
8382 | list_for_each_entry_safe(req, nxt, list, compl.list) { |
8383 | if (tsk && req->task != tsk) | |
8384 | continue; | |
1b4c351f JA |
8385 | list_del(&req->compl.list); |
8386 | kmem_cache_free(req_cachep, req); | |
8387 | } | |
8388 | } | |
8389 | ||
4010fec4 | 8390 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 8391 | { |
bf019da7 | 8392 | struct io_submit_state *submit_state = &ctx->submit_state; |
e5547d2c | 8393 | struct io_comp_state *cs = &ctx->submit_state.comp; |
bf019da7 | 8394 | |
9a4fdbd8 JA |
8395 | mutex_lock(&ctx->uring_lock); |
8396 | ||
8e5c66c4 | 8397 | if (submit_state->free_reqs) { |
9a4fdbd8 JA |
8398 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, |
8399 | submit_state->reqs); | |
8e5c66c4 PB |
8400 | submit_state->free_reqs = 0; |
8401 | } | |
9a4fdbd8 | 8402 | |
dac7a098 | 8403 | io_flush_cached_locked_reqs(ctx, cs); |
e5547d2c | 8404 | io_req_cache_free(&cs->free_list, NULL); |
9a4fdbd8 JA |
8405 | mutex_unlock(&ctx->uring_lock); |
8406 | } | |
8407 | ||
2b188cc1 JA |
8408 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8409 | { | |
04fc6c80 PB |
8410 | /* |
8411 | * Some may use context even when all refs and requests have been put, | |
180f829f PB |
8412 | * and they are free to do so while still holding uring_lock or |
8413 | * completion_lock, see __io_req_task_submit(). Wait for them to finish. | |
04fc6c80 PB |
8414 | */ |
8415 | mutex_lock(&ctx->uring_lock); | |
8416 | mutex_unlock(&ctx->uring_lock); | |
180f829f PB |
8417 | spin_lock_irq(&ctx->completion_lock); |
8418 | spin_unlock_irq(&ctx->completion_lock); | |
04fc6c80 | 8419 | |
37d1e2e3 | 8420 | io_sq_thread_finish(ctx); |
0a96bbe4 | 8421 | io_sqe_buffers_unregister(ctx); |
2aede0e4 | 8422 | |
37d1e2e3 | 8423 | if (ctx->mm_account) { |
2aede0e4 JA |
8424 | mmdrop(ctx->mm_account); |
8425 | ctx->mm_account = NULL; | |
30975825 | 8426 | } |
def596e9 | 8427 | |
8bad28d8 | 8428 | mutex_lock(&ctx->uring_lock); |
6b06314c | 8429 | io_sqe_files_unregister(ctx); |
8bad28d8 | 8430 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 8431 | io_eventfd_unregister(ctx); |
5a2e745d | 8432 | io_destroy_buffers(ctx); |
def596e9 | 8433 | |
8dd03afe PB |
8434 | if (ctx->rsrc_backup_node) |
8435 | destroy_fixed_rsrc_ref_node(ctx->rsrc_backup_node); | |
8436 | ||
2b188cc1 | 8437 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8438 | if (ctx->ring_sock) { |
8439 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8440 | sock_release(ctx->ring_sock); |
355e8d26 | 8441 | } |
2b188cc1 JA |
8442 | #endif |
8443 | ||
75b28aff | 8444 | io_mem_free(ctx->rings); |
2b188cc1 | 8445 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8446 | |
8447 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8448 | free_uid(ctx->user); |
4010fec4 | 8449 | io_req_caches_free(ctx); |
e941894e JA |
8450 | if (ctx->hash_map) |
8451 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 8452 | kfree(ctx->cancel_hash); |
2b188cc1 JA |
8453 | kfree(ctx); |
8454 | } | |
8455 | ||
8456 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8457 | { | |
8458 | struct io_ring_ctx *ctx = file->private_data; | |
8459 | __poll_t mask = 0; | |
8460 | ||
8461 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8462 | /* |
8463 | * synchronizes with barrier from wq_has_sleeper call in | |
8464 | * io_commit_cqring | |
8465 | */ | |
2b188cc1 | 8466 | smp_rmb(); |
90554200 | 8467 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8468 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8469 | |
8470 | /* | |
8471 | * Don't flush cqring overflow list here, just do a simple check. | |
8472 | * Otherwise there could possible be ABBA deadlock: | |
8473 | * CPU0 CPU1 | |
8474 | * ---- ---- | |
8475 | * lock(&ctx->uring_lock); | |
8476 | * lock(&ep->mtx); | |
8477 | * lock(&ctx->uring_lock); | |
8478 | * lock(&ep->mtx); | |
8479 | * | |
8480 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8481 | * pushs them to do the flush. | |
8482 | */ | |
8483 | if (io_cqring_events(ctx) || test_bit(0, &ctx->cq_check_overflow)) | |
2b188cc1 JA |
8484 | mask |= EPOLLIN | EPOLLRDNORM; |
8485 | ||
8486 | return mask; | |
8487 | } | |
8488 | ||
8489 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8490 | { | |
8491 | struct io_ring_ctx *ctx = file->private_data; | |
8492 | ||
8493 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8494 | } | |
8495 | ||
0bead8cd | 8496 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8497 | { |
4379bf8b | 8498 | const struct cred *creds; |
071698e1 | 8499 | |
61cf9370 | 8500 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
8501 | if (creds) { |
8502 | put_cred(creds); | |
0bead8cd | 8503 | return 0; |
1e6fa521 | 8504 | } |
0bead8cd YD |
8505 | |
8506 | return -EINVAL; | |
8507 | } | |
8508 | ||
9b465711 | 8509 | static inline bool io_run_ctx_fallback(struct io_ring_ctx *ctx) |
7c25c0d1 | 8510 | { |
9b465711 | 8511 | return io_run_task_work_head(&ctx->exit_task_work); |
7c25c0d1 JA |
8512 | } |
8513 | ||
d56d938b PB |
8514 | struct io_tctx_exit { |
8515 | struct callback_head task_work; | |
8516 | struct completion completion; | |
baf186c4 | 8517 | struct io_ring_ctx *ctx; |
d56d938b PB |
8518 | }; |
8519 | ||
8520 | static void io_tctx_exit_cb(struct callback_head *cb) | |
8521 | { | |
8522 | struct io_uring_task *tctx = current->io_uring; | |
8523 | struct io_tctx_exit *work; | |
8524 | ||
8525 | work = container_of(cb, struct io_tctx_exit, task_work); | |
8526 | /* | |
8527 | * When @in_idle, we're in cancellation and it's racy to remove the | |
8528 | * node. It'll be removed by the end of cancellation, just ignore it. | |
8529 | */ | |
8530 | if (!atomic_read(&tctx->in_idle)) | |
baf186c4 | 8531 | io_uring_del_task_file((unsigned long)work->ctx); |
d56d938b PB |
8532 | complete(&work->completion); |
8533 | } | |
8534 | ||
85faa7b8 JA |
8535 | static void io_ring_exit_work(struct work_struct *work) |
8536 | { | |
d56d938b | 8537 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 8538 | unsigned long timeout = jiffies + HZ * 60 * 5; |
d56d938b PB |
8539 | struct io_tctx_exit exit; |
8540 | struct io_tctx_node *node; | |
8541 | int ret; | |
85faa7b8 | 8542 | |
a185f1db PB |
8543 | /* prevent SQPOLL from submitting new requests */ |
8544 | if (ctx->sq_data) { | |
8545 | io_sq_thread_park(ctx->sq_data); | |
8546 | list_del_init(&ctx->sqd_list); | |
8547 | io_sqd_update_thread_idle(ctx->sq_data); | |
8548 | io_sq_thread_unpark(ctx->sq_data); | |
8549 | } | |
8550 | ||
56952e91 JA |
8551 | /* |
8552 | * If we're doing polled IO and end up having requests being | |
8553 | * submitted async (out-of-line), then completions can come in while | |
8554 | * we're waiting for refs to drop. We need to reap these manually, | |
8555 | * as nobody else will be looking for them. | |
8556 | */ | |
b2edc0a7 | 8557 | do { |
9936c7c2 | 8558 | io_uring_try_cancel_requests(ctx, NULL, NULL); |
b5bb3a24 PB |
8559 | |
8560 | WARN_ON_ONCE(time_after(jiffies, timeout)); | |
b2edc0a7 | 8561 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
d56d938b PB |
8562 | |
8563 | mutex_lock(&ctx->uring_lock); | |
8564 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
8565 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
8566 | ||
d56d938b PB |
8567 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
8568 | ctx_node); | |
baf186c4 | 8569 | exit.ctx = ctx; |
d56d938b PB |
8570 | init_completion(&exit.completion); |
8571 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
8572 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); | |
8573 | if (WARN_ON_ONCE(ret)) | |
8574 | continue; | |
8575 | wake_up_process(node->task); | |
8576 | ||
8577 | mutex_unlock(&ctx->uring_lock); | |
8578 | wait_for_completion(&exit.completion); | |
8579 | cond_resched(); | |
8580 | mutex_lock(&ctx->uring_lock); | |
8581 | } | |
8582 | mutex_unlock(&ctx->uring_lock); | |
8583 | ||
85faa7b8 JA |
8584 | io_ring_ctx_free(ctx); |
8585 | } | |
8586 | ||
80c4cbdb PB |
8587 | /* Returns true if we found and killed one or more timeouts */ |
8588 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
8589 | struct files_struct *files) | |
8590 | { | |
8591 | struct io_kiocb *req, *tmp; | |
8592 | int canceled = 0; | |
8593 | ||
8594 | spin_lock_irq(&ctx->completion_lock); | |
8595 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { | |
8596 | if (io_match_task(req, tsk, files)) { | |
8597 | io_kill_timeout(req, -ECANCELED); | |
8598 | canceled++; | |
8599 | } | |
8600 | } | |
51520426 PB |
8601 | if (canceled != 0) |
8602 | io_commit_cqring(ctx); | |
80c4cbdb | 8603 | spin_unlock_irq(&ctx->completion_lock); |
80c4cbdb PB |
8604 | if (canceled != 0) |
8605 | io_cqring_ev_posted(ctx); | |
8606 | return canceled != 0; | |
8607 | } | |
8608 | ||
2b188cc1 JA |
8609 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8610 | { | |
61cf9370 MWO |
8611 | unsigned long index; |
8612 | struct creds *creds; | |
8613 | ||
2b188cc1 JA |
8614 | mutex_lock(&ctx->uring_lock); |
8615 | percpu_ref_kill(&ctx->refs); | |
cda286f0 PB |
8616 | /* if force is set, the ring is going away. always drop after that */ |
8617 | ctx->cq_overflow_flushed = 1; | |
634578f8 | 8618 | if (ctx->rings) |
6c503150 | 8619 | __io_cqring_overflow_flush(ctx, true, NULL, NULL); |
61cf9370 MWO |
8620 | xa_for_each(&ctx->personalities, index, creds) |
8621 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
8622 | mutex_unlock(&ctx->uring_lock); |
8623 | ||
6b81928d PB |
8624 | io_kill_timeouts(ctx, NULL, NULL); |
8625 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a | 8626 | |
15dff286 | 8627 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8628 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8629 | |
85faa7b8 | 8630 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8631 | /* |
8632 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8633 | * if we're exiting a ton of rings at the same time. It just adds | |
8634 | * noise and overhead, there's no discernable change in runtime | |
8635 | * over using system_wq. | |
8636 | */ | |
8637 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8638 | } |
8639 | ||
8640 | static int io_uring_release(struct inode *inode, struct file *file) | |
8641 | { | |
8642 | struct io_ring_ctx *ctx = file->private_data; | |
8643 | ||
8644 | file->private_data = NULL; | |
8645 | io_ring_ctx_wait_and_kill(ctx); | |
8646 | return 0; | |
8647 | } | |
8648 | ||
f6edbabb PB |
8649 | struct io_task_cancel { |
8650 | struct task_struct *task; | |
8651 | struct files_struct *files; | |
8652 | }; | |
f254ac04 | 8653 | |
f6edbabb | 8654 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8655 | { |
9a472ef7 | 8656 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8657 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8658 | bool ret; |
8659 | ||
f6edbabb | 8660 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8661 | unsigned long flags; |
8662 | struct io_ring_ctx *ctx = req->ctx; | |
8663 | ||
8664 | /* protect against races with linked timeouts */ | |
8665 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8666 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8667 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8668 | } else { | |
f6edbabb | 8669 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8670 | } |
8671 | return ret; | |
b711d4ea JA |
8672 | } |
8673 | ||
e1915f76 | 8674 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8675 | struct task_struct *task, |
b7ddce3c PB |
8676 | struct files_struct *files) |
8677 | { | |
e1915f76 | 8678 | struct io_defer_entry *de; |
b7ddce3c PB |
8679 | LIST_HEAD(list); |
8680 | ||
8681 | spin_lock_irq(&ctx->completion_lock); | |
8682 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8683 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8684 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8685 | break; | |
8686 | } | |
8687 | } | |
8688 | spin_unlock_irq(&ctx->completion_lock); | |
e1915f76 PB |
8689 | if (list_empty(&list)) |
8690 | return false; | |
b7ddce3c PB |
8691 | |
8692 | while (!list_empty(&list)) { | |
8693 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8694 | list_del_init(&de->list); | |
f41db273 | 8695 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
8696 | kfree(de); |
8697 | } | |
e1915f76 | 8698 | return true; |
b7ddce3c PB |
8699 | } |
8700 | ||
1b00764f PB |
8701 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8702 | { | |
8703 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8704 | ||
8705 | return req->ctx == data; | |
8706 | } | |
8707 | ||
8708 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) | |
8709 | { | |
8710 | struct io_tctx_node *node; | |
8711 | enum io_wq_cancel cret; | |
8712 | bool ret = false; | |
8713 | ||
8714 | mutex_lock(&ctx->uring_lock); | |
8715 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
8716 | struct io_uring_task *tctx = node->task->io_uring; | |
8717 | ||
8718 | /* | |
8719 | * io_wq will stay alive while we hold uring_lock, because it's | |
8720 | * killed after ctx nodes, which requires to take the lock. | |
8721 | */ | |
8722 | if (!tctx || !tctx->io_wq) | |
8723 | continue; | |
8724 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
8725 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8726 | } | |
8727 | mutex_unlock(&ctx->uring_lock); | |
8728 | ||
8729 | return ret; | |
8730 | } | |
8731 | ||
9936c7c2 PB |
8732 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
8733 | struct task_struct *task, | |
8734 | struct files_struct *files) | |
8735 | { | |
8736 | struct io_task_cancel cancel = { .task = task, .files = files, }; | |
1b00764f | 8737 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
8738 | |
8739 | while (1) { | |
8740 | enum io_wq_cancel cret; | |
8741 | bool ret = false; | |
8742 | ||
1b00764f PB |
8743 | if (!task) { |
8744 | ret |= io_uring_try_cancel_iowq(ctx); | |
8745 | } else if (tctx && tctx->io_wq) { | |
8746 | /* | |
8747 | * Cancels requests of all rings, not only @ctx, but | |
8748 | * it's fine as the task is in exit/exec. | |
8749 | */ | |
5aa75ed5 | 8750 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
8751 | &cancel, true); |
8752 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8753 | } | |
8754 | ||
8755 | /* SQPOLL thread does its own polling */ | |
d052d1d6 JA |
8756 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && !files) || |
8757 | (ctx->sq_data && ctx->sq_data->thread == current)) { | |
9936c7c2 PB |
8758 | while (!list_empty_careful(&ctx->iopoll_list)) { |
8759 | io_iopoll_try_reap_events(ctx); | |
8760 | ret = true; | |
8761 | } | |
8762 | } | |
8763 | ||
e1915f76 | 8764 | ret |= io_cancel_defer_files(ctx, task, files); |
9936c7c2 PB |
8765 | ret |= io_poll_remove_all(ctx, task, files); |
8766 | ret |= io_kill_timeouts(ctx, task, files); | |
8767 | ret |= io_run_task_work(); | |
ba50a036 | 8768 | ret |= io_run_ctx_fallback(ctx); |
9936c7c2 PB |
8769 | io_cqring_overflow_flush(ctx, true, task, files); |
8770 | if (!ret) | |
8771 | break; | |
8772 | cond_resched(); | |
8773 | } | |
8774 | } | |
8775 | ||
ca70f00b PB |
8776 | static int io_uring_count_inflight(struct io_ring_ctx *ctx, |
8777 | struct task_struct *task, | |
8778 | struct files_struct *files) | |
8779 | { | |
8780 | struct io_kiocb *req; | |
8781 | int cnt = 0; | |
8782 | ||
8783 | spin_lock_irq(&ctx->inflight_lock); | |
8784 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) | |
8785 | cnt += io_match_task(req, task, files); | |
8786 | spin_unlock_irq(&ctx->inflight_lock); | |
8787 | return cnt; | |
8788 | } | |
8789 | ||
b52fda00 | 8790 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8791 | struct task_struct *task, |
fcb323cc JA |
8792 | struct files_struct *files) |
8793 | { | |
fcb323cc | 8794 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 | 8795 | DEFINE_WAIT(wait); |
ca70f00b | 8796 | int inflight; |
fcb323cc | 8797 | |
ca70f00b PB |
8798 | inflight = io_uring_count_inflight(ctx, task, files); |
8799 | if (!inflight) | |
fcb323cc | 8800 | break; |
f6edbabb | 8801 | |
9936c7c2 | 8802 | io_uring_try_cancel_requests(ctx, task, files); |
ca70f00b PB |
8803 | |
8804 | prepare_to_wait(&task->io_uring->wait, &wait, | |
8805 | TASK_UNINTERRUPTIBLE); | |
8806 | if (inflight == io_uring_count_inflight(ctx, task, files)) | |
8807 | schedule(); | |
c98de08c | 8808 | finish_wait(&task->io_uring->wait, &wait); |
0f212204 | 8809 | } |
0f212204 JA |
8810 | } |
8811 | ||
cf27f3b1 | 8812 | static int __io_uring_add_task_file(struct io_ring_ctx *ctx) |
0f212204 | 8813 | { |
236434c3 | 8814 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 8815 | struct io_tctx_node *node; |
a528b04e | 8816 | int ret; |
236434c3 MWO |
8817 | |
8818 | if (unlikely(!tctx)) { | |
5aa75ed5 | 8819 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
8820 | if (unlikely(ret)) |
8821 | return ret; | |
236434c3 | 8822 | tctx = current->io_uring; |
0f212204 | 8823 | } |
cf27f3b1 PB |
8824 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
8825 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
8826 | if (!node) | |
8827 | return -ENOMEM; | |
8828 | node->ctx = ctx; | |
8829 | node->task = current; | |
13bf43f5 | 8830 | |
cf27f3b1 PB |
8831 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
8832 | node, GFP_KERNEL)); | |
8833 | if (ret) { | |
8834 | kfree(node); | |
8835 | return ret; | |
0f212204 | 8836 | } |
cf27f3b1 PB |
8837 | |
8838 | mutex_lock(&ctx->uring_lock); | |
8839 | list_add(&node->ctx_node, &ctx->tctx_list); | |
8840 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 8841 | } |
cf27f3b1 | 8842 | tctx->last = ctx; |
0f212204 JA |
8843 | return 0; |
8844 | } | |
8845 | ||
cf27f3b1 PB |
8846 | /* |
8847 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8848 | */ | |
8849 | static inline int io_uring_add_task_file(struct io_ring_ctx *ctx) | |
8850 | { | |
8851 | struct io_uring_task *tctx = current->io_uring; | |
8852 | ||
8853 | if (likely(tctx && tctx->last == ctx)) | |
8854 | return 0; | |
8855 | return __io_uring_add_task_file(ctx); | |
8856 | } | |
8857 | ||
0f212204 JA |
8858 | /* |
8859 | * Remove this io_uring_file -> task mapping. | |
8860 | */ | |
2941267b | 8861 | static void io_uring_del_task_file(unsigned long index) |
0f212204 JA |
8862 | { |
8863 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 8864 | struct io_tctx_node *node; |
2941267b | 8865 | |
eebd2e37 PB |
8866 | if (!tctx) |
8867 | return; | |
13bf43f5 PB |
8868 | node = xa_erase(&tctx->xa, index); |
8869 | if (!node) | |
2941267b | 8870 | return; |
0f212204 | 8871 | |
13bf43f5 PB |
8872 | WARN_ON_ONCE(current != node->task); |
8873 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
8874 | ||
8875 | mutex_lock(&node->ctx->uring_lock); | |
8876 | list_del(&node->ctx_node); | |
8877 | mutex_unlock(&node->ctx->uring_lock); | |
8878 | ||
baf186c4 | 8879 | if (tctx->last == node->ctx) |
0f212204 | 8880 | tctx->last = NULL; |
13bf43f5 | 8881 | kfree(node); |
0f212204 JA |
8882 | } |
8883 | ||
8452d4a6 | 8884 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 8885 | { |
13bf43f5 | 8886 | struct io_tctx_node *node; |
de7f1d9e PB |
8887 | unsigned long index; |
8888 | ||
13bf43f5 | 8889 | xa_for_each(&tctx->xa, index, node) |
2941267b | 8890 | io_uring_del_task_file(index); |
8452d4a6 PB |
8891 | if (tctx->io_wq) { |
8892 | io_wq_put_and_exit(tctx->io_wq); | |
8893 | tctx->io_wq = NULL; | |
8894 | } | |
de7f1d9e PB |
8895 | } |
8896 | ||
521d6a73 PB |
8897 | static s64 tctx_inflight(struct io_uring_task *tctx) |
8898 | { | |
8899 | return percpu_counter_sum(&tctx->inflight); | |
8900 | } | |
8901 | ||
8902 | static void io_sqpoll_cancel_cb(struct callback_head *cb) | |
8903 | { | |
8904 | struct io_tctx_exit *work = container_of(cb, struct io_tctx_exit, task_work); | |
8905 | struct io_ring_ctx *ctx = work->ctx; | |
8906 | struct io_sq_data *sqd = ctx->sq_data; | |
8907 | ||
8908 | if (sqd->thread) | |
8909 | io_uring_cancel_sqpoll(ctx); | |
8910 | complete(&work->completion); | |
8911 | } | |
8912 | ||
8913 | static void io_sqpoll_cancel_sync(struct io_ring_ctx *ctx) | |
8914 | { | |
8915 | struct io_sq_data *sqd = ctx->sq_data; | |
8916 | struct io_tctx_exit work = { .ctx = ctx, }; | |
8917 | struct task_struct *task; | |
8918 | ||
8919 | io_sq_thread_park(sqd); | |
8920 | list_del_init(&ctx->sqd_list); | |
8921 | io_sqd_update_thread_idle(sqd); | |
8922 | task = sqd->thread; | |
8923 | if (task) { | |
8924 | init_completion(&work.completion); | |
8925 | init_task_work(&work.task_work, io_sqpoll_cancel_cb); | |
b7f5a0bf | 8926 | io_task_work_add_head(&sqd->park_task_work, &work.task_work); |
521d6a73 PB |
8927 | wake_up_process(task); |
8928 | } | |
8929 | io_sq_thread_unpark(sqd); | |
8930 | ||
8931 | if (task) | |
8932 | wait_for_completion(&work.completion); | |
8933 | } | |
8934 | ||
0f212204 JA |
8935 | void __io_uring_files_cancel(struct files_struct *files) |
8936 | { | |
8937 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 8938 | struct io_tctx_node *node; |
ce765372 | 8939 | unsigned long index; |
0f212204 JA |
8940 | |
8941 | /* make sure overflow events are dropped */ | |
fdaf083c | 8942 | atomic_inc(&tctx->in_idle); |
521d6a73 PB |
8943 | xa_for_each(&tctx->xa, index, node) { |
8944 | struct io_ring_ctx *ctx = node->ctx; | |
8945 | ||
8946 | if (ctx->sq_data) { | |
8947 | io_sqpoll_cancel_sync(ctx); | |
8948 | continue; | |
8949 | } | |
8950 | io_uring_cancel_files(ctx, current, files); | |
8951 | if (!files) | |
8952 | io_uring_try_cancel_requests(ctx, current, NULL); | |
8953 | } | |
fdaf083c | 8954 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 8955 | |
8452d4a6 PB |
8956 | if (files) |
8957 | io_uring_clean_tctx(tctx); | |
fdaf083c JA |
8958 | } |
8959 | ||
521d6a73 | 8960 | /* should only be called by SQPOLL task */ |
0e9ddb39 PB |
8961 | static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx) |
8962 | { | |
37d1e2e3 | 8963 | struct io_sq_data *sqd = ctx->sq_data; |
521d6a73 | 8964 | struct io_uring_task *tctx = current->io_uring; |
0e9ddb39 PB |
8965 | s64 inflight; |
8966 | DEFINE_WAIT(wait); | |
fdaf083c | 8967 | |
521d6a73 PB |
8968 | WARN_ON_ONCE(!sqd || ctx->sq_data->thread != current); |
8969 | ||
0e9ddb39 PB |
8970 | atomic_inc(&tctx->in_idle); |
8971 | do { | |
8972 | /* read completions before cancelations */ | |
8973 | inflight = tctx_inflight(tctx); | |
8974 | if (!inflight) | |
8975 | break; | |
521d6a73 | 8976 | io_uring_try_cancel_requests(ctx, current, NULL); |
fdaf083c | 8977 | |
0e9ddb39 PB |
8978 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
8979 | /* | |
8980 | * If we've seen completions, retry without waiting. This | |
8981 | * avoids a race where a completion comes in before we did | |
8982 | * prepare_to_wait(). | |
8983 | */ | |
8984 | if (inflight == tctx_inflight(tctx)) | |
8985 | schedule(); | |
8986 | finish_wait(&tctx->wait, &wait); | |
8987 | } while (1); | |
8988 | atomic_dec(&tctx->in_idle); | |
0f212204 JA |
8989 | } |
8990 | ||
0f212204 JA |
8991 | /* |
8992 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8993 | * requests. | |
8994 | */ | |
8995 | void __io_uring_task_cancel(void) | |
8996 | { | |
8997 | struct io_uring_task *tctx = current->io_uring; | |
8998 | DEFINE_WAIT(wait); | |
d8a6df10 | 8999 | s64 inflight; |
0f212204 JA |
9000 | |
9001 | /* make sure overflow events are dropped */ | |
fdaf083c | 9002 | atomic_inc(&tctx->in_idle); |
5a978dcf PB |
9003 | __io_uring_files_cancel(NULL); |
9004 | ||
d8a6df10 | 9005 | do { |
0f212204 | 9006 | /* read completions before cancelations */ |
fdaf083c | 9007 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9008 | if (!inflight) |
9009 | break; | |
0f212204 JA |
9010 | __io_uring_files_cancel(NULL); |
9011 | ||
9012 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9013 | ||
9014 | /* | |
a1bb3cd5 PB |
9015 | * If we've seen completions, retry without waiting. This |
9016 | * avoids a race where a completion comes in before we did | |
9017 | * prepare_to_wait(). | |
0f212204 | 9018 | */ |
a1bb3cd5 PB |
9019 | if (inflight == tctx_inflight(tctx)) |
9020 | schedule(); | |
f57555ed | 9021 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9022 | } while (1); |
0f212204 | 9023 | |
fdaf083c | 9024 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9025 | |
8452d4a6 PB |
9026 | io_uring_clean_tctx(tctx); |
9027 | /* all current's requests should be gone, we can kill tctx */ | |
9028 | __io_uring_free(current); | |
44e728b8 PB |
9029 | } |
9030 | ||
6c5c240e RP |
9031 | static void *io_uring_validate_mmap_request(struct file *file, |
9032 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9033 | { |
2b188cc1 | 9034 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9035 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9036 | struct page *page; |
9037 | void *ptr; | |
9038 | ||
9039 | switch (offset) { | |
9040 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9041 | case IORING_OFF_CQ_RING: |
9042 | ptr = ctx->rings; | |
2b188cc1 JA |
9043 | break; |
9044 | case IORING_OFF_SQES: | |
9045 | ptr = ctx->sq_sqes; | |
9046 | break; | |
2b188cc1 | 9047 | default: |
6c5c240e | 9048 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9049 | } |
9050 | ||
9051 | page = virt_to_head_page(ptr); | |
a50b854e | 9052 | if (sz > page_size(page)) |
6c5c240e RP |
9053 | return ERR_PTR(-EINVAL); |
9054 | ||
9055 | return ptr; | |
9056 | } | |
9057 | ||
9058 | #ifdef CONFIG_MMU | |
9059 | ||
9060 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9061 | { | |
9062 | size_t sz = vma->vm_end - vma->vm_start; | |
9063 | unsigned long pfn; | |
9064 | void *ptr; | |
9065 | ||
9066 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9067 | if (IS_ERR(ptr)) | |
9068 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9069 | |
9070 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9071 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9072 | } | |
9073 | ||
6c5c240e RP |
9074 | #else /* !CONFIG_MMU */ |
9075 | ||
9076 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9077 | { | |
9078 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9079 | } | |
9080 | ||
9081 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9082 | { | |
9083 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9084 | } | |
9085 | ||
9086 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9087 | unsigned long addr, unsigned long len, | |
9088 | unsigned long pgoff, unsigned long flags) | |
9089 | { | |
9090 | void *ptr; | |
9091 | ||
9092 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9093 | if (IS_ERR(ptr)) | |
9094 | return PTR_ERR(ptr); | |
9095 | ||
9096 | return (unsigned long) ptr; | |
9097 | } | |
9098 | ||
9099 | #endif /* !CONFIG_MMU */ | |
9100 | ||
d9d05217 | 9101 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9102 | { |
9103 | DEFINE_WAIT(wait); | |
9104 | ||
9105 | do { | |
9106 | if (!io_sqring_full(ctx)) | |
9107 | break; | |
90554200 JA |
9108 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9109 | ||
9110 | if (!io_sqring_full(ctx)) | |
9111 | break; | |
90554200 JA |
9112 | schedule(); |
9113 | } while (!signal_pending(current)); | |
9114 | ||
9115 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9116 | return 0; |
90554200 JA |
9117 | } |
9118 | ||
c73ebb68 HX |
9119 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9120 | struct __kernel_timespec __user **ts, | |
9121 | const sigset_t __user **sig) | |
9122 | { | |
9123 | struct io_uring_getevents_arg arg; | |
9124 | ||
9125 | /* | |
9126 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9127 | * is just a pointer to the sigset_t. | |
9128 | */ | |
9129 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9130 | *sig = (const sigset_t __user *) argp; | |
9131 | *ts = NULL; | |
9132 | return 0; | |
9133 | } | |
9134 | ||
9135 | /* | |
9136 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9137 | * timespec and sigset_t pointers if good. | |
9138 | */ | |
9139 | if (*argsz != sizeof(arg)) | |
9140 | return -EINVAL; | |
9141 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9142 | return -EFAULT; | |
9143 | *sig = u64_to_user_ptr(arg.sigmask); | |
9144 | *argsz = arg.sigmask_sz; | |
9145 | *ts = u64_to_user_ptr(arg.ts); | |
9146 | return 0; | |
9147 | } | |
9148 | ||
2b188cc1 | 9149 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9150 | u32, min_complete, u32, flags, const void __user *, argp, |
9151 | size_t, argsz) | |
2b188cc1 JA |
9152 | { |
9153 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9154 | int submitted = 0; |
9155 | struct fd f; | |
33f993da | 9156 | long ret; |
2b188cc1 | 9157 | |
4c6e277c | 9158 | io_run_task_work(); |
b41e9852 | 9159 | |
33f993da PB |
9160 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9161 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9162 | return -EINVAL; |
9163 | ||
9164 | f = fdget(fd); | |
33f993da | 9165 | if (unlikely(!f.file)) |
2b188cc1 JA |
9166 | return -EBADF; |
9167 | ||
9168 | ret = -EOPNOTSUPP; | |
33f993da | 9169 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9170 | goto out_fput; |
9171 | ||
9172 | ret = -ENXIO; | |
9173 | ctx = f.file->private_data; | |
33f993da | 9174 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9175 | goto out_fput; |
9176 | ||
7e84e1c7 | 9177 | ret = -EBADFD; |
33f993da | 9178 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9179 | goto out; |
9180 | ||
6c271ce2 JA |
9181 | /* |
9182 | * For SQ polling, the thread will do all submissions and completions. | |
9183 | * Just return the requested submit count, and wake the thread if | |
9184 | * we were asked to. | |
9185 | */ | |
b2a9eada | 9186 | ret = 0; |
6c271ce2 | 9187 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c503150 | 9188 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
89448c47 | 9189 | |
d9d05217 | 9190 | ret = -EOWNERDEAD; |
04147488 SM |
9191 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9192 | goto out; | |
9193 | } | |
6c271ce2 | 9194 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9195 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9196 | if (flags & IORING_ENTER_SQ_WAIT) { |
9197 | ret = io_sqpoll_wait_sq(ctx); | |
9198 | if (ret) | |
9199 | goto out; | |
9200 | } | |
6c271ce2 | 9201 | submitted = to_submit; |
b2a9eada | 9202 | } else if (to_submit) { |
baf186c4 | 9203 | ret = io_uring_add_task_file(ctx); |
0f212204 JA |
9204 | if (unlikely(ret)) |
9205 | goto out; | |
2b188cc1 | 9206 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9207 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9208 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9209 | |
9210 | if (submitted != to_submit) | |
9211 | goto out; | |
2b188cc1 JA |
9212 | } |
9213 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9214 | const sigset_t __user *sig; |
9215 | struct __kernel_timespec __user *ts; | |
9216 | ||
9217 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9218 | if (unlikely(ret)) | |
9219 | goto out; | |
9220 | ||
2b188cc1 JA |
9221 | min_complete = min(min_complete, ctx->cq_entries); |
9222 | ||
32b2244a XW |
9223 | /* |
9224 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9225 | * space applications don't need to do io completion events | |
9226 | * polling again, they can rely on io_sq_thread to do polling | |
9227 | * work, which can reduce cpu usage and uring_lock contention. | |
9228 | */ | |
9229 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9230 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9231 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9232 | } else { |
c73ebb68 | 9233 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9234 | } |
2b188cc1 JA |
9235 | } |
9236 | ||
7c504e65 | 9237 | out: |
6805b32e | 9238 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9239 | out_fput: |
9240 | fdput(f); | |
9241 | return submitted ? submitted : ret; | |
9242 | } | |
9243 | ||
bebdb65e | 9244 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9245 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9246 | const struct cred *cred) | |
87ce955b | 9247 | { |
87ce955b JA |
9248 | struct user_namespace *uns = seq_user_ns(m); |
9249 | struct group_info *gi; | |
9250 | kernel_cap_t cap; | |
9251 | unsigned __capi; | |
9252 | int g; | |
9253 | ||
9254 | seq_printf(m, "%5d\n", id); | |
9255 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9256 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9257 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9258 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9259 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9260 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9261 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9262 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9263 | seq_puts(m, "\n\tGroups:\t"); | |
9264 | gi = cred->group_info; | |
9265 | for (g = 0; g < gi->ngroups; g++) { | |
9266 | seq_put_decimal_ull(m, g ? " " : "", | |
9267 | from_kgid_munged(uns, gi->gid[g])); | |
9268 | } | |
9269 | seq_puts(m, "\n\tCapEff:\t"); | |
9270 | cap = cred->cap_effective; | |
9271 | CAP_FOR_EACH_U32(__capi) | |
9272 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9273 | seq_putc(m, '\n'); | |
9274 | return 0; | |
9275 | } | |
9276 | ||
9277 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9278 | { | |
dbbe9c64 | 9279 | struct io_sq_data *sq = NULL; |
fad8e0de | 9280 | bool has_lock; |
87ce955b JA |
9281 | int i; |
9282 | ||
fad8e0de JA |
9283 | /* |
9284 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9285 | * since fdinfo case grabs it in the opposite direction of normal use | |
9286 | * cases. If we fail to get the lock, we just don't iterate any | |
9287 | * structures that could be going away outside the io_uring mutex. | |
9288 | */ | |
9289 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9290 | ||
5f3f26f9 | 9291 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9292 | sq = ctx->sq_data; |
5f3f26f9 JA |
9293 | if (!sq->thread) |
9294 | sq = NULL; | |
9295 | } | |
dbbe9c64 JQ |
9296 | |
9297 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9298 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9299 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9300 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9301 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9302 | |
87ce955b JA |
9303 | if (f) |
9304 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9305 | else | |
9306 | seq_printf(m, "%5u: <none>\n", i); | |
9307 | } | |
9308 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9309 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9310 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9311 | ||
9312 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9313 | (unsigned int) buf->len); | |
9314 | } | |
61cf9370 MWO |
9315 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9316 | unsigned long index; | |
9317 | const struct cred *cred; | |
9318 | ||
87ce955b | 9319 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9320 | xa_for_each(&ctx->personalities, index, cred) |
9321 | io_uring_show_cred(m, index, cred); | |
87ce955b | 9322 | } |
d7718a9d JA |
9323 | seq_printf(m, "PollList:\n"); |
9324 | spin_lock_irq(&ctx->completion_lock); | |
9325 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9326 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9327 | struct io_kiocb *req; | |
9328 | ||
9329 | hlist_for_each_entry(req, list, hash_node) | |
9330 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9331 | req->task->task_works != NULL); | |
9332 | } | |
9333 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9334 | if (has_lock) |
9335 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9336 | } |
9337 | ||
9338 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9339 | { | |
9340 | struct io_ring_ctx *ctx = f->private_data; | |
9341 | ||
9342 | if (percpu_ref_tryget(&ctx->refs)) { | |
9343 | __io_uring_show_fdinfo(ctx, m); | |
9344 | percpu_ref_put(&ctx->refs); | |
9345 | } | |
9346 | } | |
bebdb65e | 9347 | #endif |
87ce955b | 9348 | |
2b188cc1 JA |
9349 | static const struct file_operations io_uring_fops = { |
9350 | .release = io_uring_release, | |
9351 | .mmap = io_uring_mmap, | |
6c5c240e RP |
9352 | #ifndef CONFIG_MMU |
9353 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9354 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9355 | #endif | |
2b188cc1 JA |
9356 | .poll = io_uring_poll, |
9357 | .fasync = io_uring_fasync, | |
bebdb65e | 9358 | #ifdef CONFIG_PROC_FS |
87ce955b | 9359 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9360 | #endif |
2b188cc1 JA |
9361 | }; |
9362 | ||
9363 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9364 | struct io_uring_params *p) | |
9365 | { | |
75b28aff HV |
9366 | struct io_rings *rings; |
9367 | size_t size, sq_array_offset; | |
2b188cc1 | 9368 | |
bd740481 JA |
9369 | /* make sure these are sane, as we already accounted them */ |
9370 | ctx->sq_entries = p->sq_entries; | |
9371 | ctx->cq_entries = p->cq_entries; | |
9372 | ||
75b28aff HV |
9373 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9374 | if (size == SIZE_MAX) | |
9375 | return -EOVERFLOW; | |
9376 | ||
9377 | rings = io_mem_alloc(size); | |
9378 | if (!rings) | |
2b188cc1 JA |
9379 | return -ENOMEM; |
9380 | ||
75b28aff HV |
9381 | ctx->rings = rings; |
9382 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9383 | rings->sq_ring_mask = p->sq_entries - 1; | |
9384 | rings->cq_ring_mask = p->cq_entries - 1; | |
9385 | rings->sq_ring_entries = p->sq_entries; | |
9386 | rings->cq_ring_entries = p->cq_entries; | |
9387 | ctx->sq_mask = rings->sq_ring_mask; | |
9388 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9389 | |
9390 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9391 | if (size == SIZE_MAX) { |
9392 | io_mem_free(ctx->rings); | |
9393 | ctx->rings = NULL; | |
2b188cc1 | 9394 | return -EOVERFLOW; |
eb065d30 | 9395 | } |
2b188cc1 JA |
9396 | |
9397 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9398 | if (!ctx->sq_sqes) { |
9399 | io_mem_free(ctx->rings); | |
9400 | ctx->rings = NULL; | |
2b188cc1 | 9401 | return -ENOMEM; |
eb065d30 | 9402 | } |
2b188cc1 | 9403 | |
2b188cc1 JA |
9404 | return 0; |
9405 | } | |
9406 | ||
9faadcc8 PB |
9407 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9408 | { | |
9409 | int ret, fd; | |
9410 | ||
9411 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9412 | if (fd < 0) | |
9413 | return fd; | |
9414 | ||
baf186c4 | 9415 | ret = io_uring_add_task_file(ctx); |
9faadcc8 PB |
9416 | if (ret) { |
9417 | put_unused_fd(fd); | |
9418 | return ret; | |
9419 | } | |
9420 | fd_install(fd, file); | |
9421 | return fd; | |
9422 | } | |
9423 | ||
2b188cc1 JA |
9424 | /* |
9425 | * Allocate an anonymous fd, this is what constitutes the application | |
9426 | * visible backing of an io_uring instance. The application mmaps this | |
9427 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9428 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9429 | */ | |
9faadcc8 | 9430 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9431 | { |
9432 | struct file *file; | |
9faadcc8 | 9433 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9434 | int ret; |
9435 | ||
2b188cc1 JA |
9436 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9437 | &ctx->ring_sock); | |
9438 | if (ret) | |
9faadcc8 | 9439 | return ERR_PTR(ret); |
2b188cc1 JA |
9440 | #endif |
9441 | ||
2b188cc1 JA |
9442 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9443 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9444 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9445 | if (IS_ERR(file)) { |
9446 | sock_release(ctx->ring_sock); | |
9447 | ctx->ring_sock = NULL; | |
9448 | } else { | |
9449 | ctx->ring_sock->file = file; | |
0f212204 | 9450 | } |
2b188cc1 | 9451 | #endif |
9faadcc8 | 9452 | return file; |
2b188cc1 JA |
9453 | } |
9454 | ||
7f13657d XW |
9455 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9456 | struct io_uring_params __user *params) | |
2b188cc1 | 9457 | { |
2b188cc1 | 9458 | struct io_ring_ctx *ctx; |
9faadcc8 | 9459 | struct file *file; |
2b188cc1 JA |
9460 | int ret; |
9461 | ||
8110c1a6 | 9462 | if (!entries) |
2b188cc1 | 9463 | return -EINVAL; |
8110c1a6 JA |
9464 | if (entries > IORING_MAX_ENTRIES) { |
9465 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9466 | return -EINVAL; | |
9467 | entries = IORING_MAX_ENTRIES; | |
9468 | } | |
2b188cc1 JA |
9469 | |
9470 | /* | |
9471 | * Use twice as many entries for the CQ ring. It's possible for the | |
9472 | * application to drive a higher depth than the size of the SQ ring, | |
9473 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9474 | * some flexibility in overcommitting a bit. If the application has |
9475 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9476 | * of CQ ring entries manually. | |
2b188cc1 JA |
9477 | */ |
9478 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9479 | if (p->flags & IORING_SETUP_CQSIZE) { |
9480 | /* | |
9481 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9482 | * to a power-of-two, if it isn't already. We do NOT impose | |
9483 | * any cq vs sq ring sizing. | |
9484 | */ | |
eb2667b3 | 9485 | if (!p->cq_entries) |
33a107f0 | 9486 | return -EINVAL; |
8110c1a6 JA |
9487 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9488 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9489 | return -EINVAL; | |
9490 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9491 | } | |
eb2667b3 JQ |
9492 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9493 | if (p->cq_entries < p->sq_entries) | |
9494 | return -EINVAL; | |
33a107f0 JA |
9495 | } else { |
9496 | p->cq_entries = 2 * p->sq_entries; | |
9497 | } | |
2b188cc1 | 9498 | |
2b188cc1 | 9499 | ctx = io_ring_ctx_alloc(p); |
62e398be | 9500 | if (!ctx) |
2b188cc1 | 9501 | return -ENOMEM; |
2b188cc1 | 9502 | ctx->compat = in_compat_syscall(); |
62e398be JA |
9503 | if (!capable(CAP_IPC_LOCK)) |
9504 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
9505 | |
9506 | /* | |
9507 | * This is just grabbed for accounting purposes. When a process exits, | |
9508 | * the mm is exited and dropped before the files, hence we need to hang | |
9509 | * on to this mm purely for the purposes of being able to unaccount | |
9510 | * memory (locked/pinned vm). It's not used for anything else. | |
9511 | */ | |
6b7898eb | 9512 | mmgrab(current->mm); |
2aede0e4 | 9513 | ctx->mm_account = current->mm; |
6b7898eb | 9514 | |
2b188cc1 JA |
9515 | ret = io_allocate_scq_urings(ctx, p); |
9516 | if (ret) | |
9517 | goto err; | |
9518 | ||
7e84e1c7 | 9519 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9520 | if (ret) |
9521 | goto err; | |
9522 | ||
2b188cc1 | 9523 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9524 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9525 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9526 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9527 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9528 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9529 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9530 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9531 | |
9532 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9533 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9534 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9535 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9536 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9537 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9538 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9539 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9540 | |
7f13657d XW |
9541 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9542 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9543 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 9544 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
1c0aa1fa | 9545 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS; |
7f13657d XW |
9546 | |
9547 | if (copy_to_user(params, p, sizeof(*p))) { | |
9548 | ret = -EFAULT; | |
9549 | goto err; | |
9550 | } | |
d1719f70 | 9551 | |
9faadcc8 PB |
9552 | file = io_uring_get_file(ctx); |
9553 | if (IS_ERR(file)) { | |
9554 | ret = PTR_ERR(file); | |
9555 | goto err; | |
9556 | } | |
9557 | ||
044c1ab3 JA |
9558 | /* |
9559 | * Install ring fd as the very last thing, so we don't risk someone | |
9560 | * having closed it before we finish setup | |
9561 | */ | |
9faadcc8 PB |
9562 | ret = io_uring_install_fd(ctx, file); |
9563 | if (ret < 0) { | |
9564 | /* fput will clean it up */ | |
9565 | fput(file); | |
9566 | return ret; | |
9567 | } | |
044c1ab3 | 9568 | |
c826bd7a | 9569 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9570 | return ret; |
9571 | err: | |
9572 | io_ring_ctx_wait_and_kill(ctx); | |
9573 | return ret; | |
9574 | } | |
9575 | ||
9576 | /* | |
9577 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9578 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9579 | * params structure passed in. | |
9580 | */ | |
9581 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9582 | { | |
9583 | struct io_uring_params p; | |
2b188cc1 JA |
9584 | int i; |
9585 | ||
9586 | if (copy_from_user(&p, params, sizeof(p))) | |
9587 | return -EFAULT; | |
9588 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9589 | if (p.resv[i]) | |
9590 | return -EINVAL; | |
9591 | } | |
9592 | ||
6c271ce2 | 9593 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9594 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9595 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9596 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9597 | return -EINVAL; |
9598 | ||
7f13657d | 9599 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9600 | } |
9601 | ||
9602 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9603 | struct io_uring_params __user *, params) | |
9604 | { | |
9605 | return io_uring_setup(entries, params); | |
9606 | } | |
9607 | ||
66f4af93 JA |
9608 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9609 | { | |
9610 | struct io_uring_probe *p; | |
9611 | size_t size; | |
9612 | int i, ret; | |
9613 | ||
9614 | size = struct_size(p, ops, nr_args); | |
9615 | if (size == SIZE_MAX) | |
9616 | return -EOVERFLOW; | |
9617 | p = kzalloc(size, GFP_KERNEL); | |
9618 | if (!p) | |
9619 | return -ENOMEM; | |
9620 | ||
9621 | ret = -EFAULT; | |
9622 | if (copy_from_user(p, arg, size)) | |
9623 | goto out; | |
9624 | ret = -EINVAL; | |
9625 | if (memchr_inv(p, 0, size)) | |
9626 | goto out; | |
9627 | ||
9628 | p->last_op = IORING_OP_LAST - 1; | |
9629 | if (nr_args > IORING_OP_LAST) | |
9630 | nr_args = IORING_OP_LAST; | |
9631 | ||
9632 | for (i = 0; i < nr_args; i++) { | |
9633 | p->ops[i].op = i; | |
9634 | if (!io_op_defs[i].not_supported) | |
9635 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9636 | } | |
9637 | p->ops_len = i; | |
9638 | ||
9639 | ret = 0; | |
9640 | if (copy_to_user(arg, p, size)) | |
9641 | ret = -EFAULT; | |
9642 | out: | |
9643 | kfree(p); | |
9644 | return ret; | |
9645 | } | |
9646 | ||
071698e1 JA |
9647 | static int io_register_personality(struct io_ring_ctx *ctx) |
9648 | { | |
4379bf8b | 9649 | const struct cred *creds; |
61cf9370 | 9650 | u32 id; |
1e6fa521 | 9651 | int ret; |
071698e1 | 9652 | |
4379bf8b | 9653 | creds = get_current_cred(); |
1e6fa521 | 9654 | |
61cf9370 MWO |
9655 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
9656 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
9657 | if (!ret) | |
9658 | return id; | |
9659 | put_cred(creds); | |
1e6fa521 | 9660 | return ret; |
071698e1 JA |
9661 | } |
9662 | ||
21b55dbc SG |
9663 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9664 | unsigned int nr_args) | |
9665 | { | |
9666 | struct io_uring_restriction *res; | |
9667 | size_t size; | |
9668 | int i, ret; | |
9669 | ||
7e84e1c7 SG |
9670 | /* Restrictions allowed only if rings started disabled */ |
9671 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9672 | return -EBADFD; | |
9673 | ||
21b55dbc | 9674 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9675 | if (ctx->restrictions.registered) |
21b55dbc SG |
9676 | return -EBUSY; |
9677 | ||
9678 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9679 | return -EINVAL; | |
9680 | ||
9681 | size = array_size(nr_args, sizeof(*res)); | |
9682 | if (size == SIZE_MAX) | |
9683 | return -EOVERFLOW; | |
9684 | ||
9685 | res = memdup_user(arg, size); | |
9686 | if (IS_ERR(res)) | |
9687 | return PTR_ERR(res); | |
9688 | ||
9689 | ret = 0; | |
9690 | ||
9691 | for (i = 0; i < nr_args; i++) { | |
9692 | switch (res[i].opcode) { | |
9693 | case IORING_RESTRICTION_REGISTER_OP: | |
9694 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9695 | ret = -EINVAL; | |
9696 | goto out; | |
9697 | } | |
9698 | ||
9699 | __set_bit(res[i].register_op, | |
9700 | ctx->restrictions.register_op); | |
9701 | break; | |
9702 | case IORING_RESTRICTION_SQE_OP: | |
9703 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9704 | ret = -EINVAL; | |
9705 | goto out; | |
9706 | } | |
9707 | ||
9708 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9709 | break; | |
9710 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9711 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9712 | break; | |
9713 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9714 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9715 | break; | |
9716 | default: | |
9717 | ret = -EINVAL; | |
9718 | goto out; | |
9719 | } | |
9720 | } | |
9721 | ||
9722 | out: | |
9723 | /* Reset all restrictions if an error happened */ | |
9724 | if (ret != 0) | |
9725 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9726 | else | |
7e84e1c7 | 9727 | ctx->restrictions.registered = true; |
21b55dbc SG |
9728 | |
9729 | kfree(res); | |
9730 | return ret; | |
9731 | } | |
9732 | ||
7e84e1c7 SG |
9733 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9734 | { | |
9735 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9736 | return -EBADFD; | |
9737 | ||
9738 | if (ctx->restrictions.registered) | |
9739 | ctx->restricted = 1; | |
9740 | ||
0298ef96 PB |
9741 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
9742 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
9743 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
9744 | return 0; |
9745 | } | |
9746 | ||
071698e1 JA |
9747 | static bool io_register_op_must_quiesce(int op) |
9748 | { | |
9749 | switch (op) { | |
9750 | case IORING_UNREGISTER_FILES: | |
9751 | case IORING_REGISTER_FILES_UPDATE: | |
9752 | case IORING_REGISTER_PROBE: | |
9753 | case IORING_REGISTER_PERSONALITY: | |
9754 | case IORING_UNREGISTER_PERSONALITY: | |
9755 | return false; | |
9756 | default: | |
9757 | return true; | |
9758 | } | |
9759 | } | |
9760 | ||
edafccee JA |
9761 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9762 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9763 | __releases(ctx->uring_lock) |
9764 | __acquires(ctx->uring_lock) | |
edafccee JA |
9765 | { |
9766 | int ret; | |
9767 | ||
35fa71a0 JA |
9768 | /* |
9769 | * We're inside the ring mutex, if the ref is already dying, then | |
9770 | * someone else killed the ctx or is already going through | |
9771 | * io_uring_register(). | |
9772 | */ | |
9773 | if (percpu_ref_is_dying(&ctx->refs)) | |
9774 | return -ENXIO; | |
9775 | ||
071698e1 | 9776 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9777 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9778 | |
05f3fb3c JA |
9779 | /* |
9780 | * Drop uring mutex before waiting for references to exit. If | |
9781 | * another thread is currently inside io_uring_enter() it might | |
9782 | * need to grab the uring_lock to make progress. If we hold it | |
9783 | * here across the drain wait, then we can deadlock. It's safe | |
9784 | * to drop the mutex here, since no new references will come in | |
9785 | * after we've killed the percpu ref. | |
9786 | */ | |
9787 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9788 | do { |
9789 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9790 | if (!ret) | |
9791 | break; | |
ed6930c9 JA |
9792 | ret = io_run_task_work_sig(); |
9793 | if (ret < 0) | |
9794 | break; | |
af9c1a44 JA |
9795 | } while (1); |
9796 | ||
05f3fb3c | 9797 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9798 | |
c150368b JA |
9799 | if (ret) { |
9800 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9801 | goto out_quiesce; |
9802 | } | |
9803 | } | |
9804 | ||
9805 | if (ctx->restricted) { | |
9806 | if (opcode >= IORING_REGISTER_LAST) { | |
9807 | ret = -EINVAL; | |
9808 | goto out; | |
9809 | } | |
9810 | ||
9811 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9812 | ret = -EACCES; | |
c150368b JA |
9813 | goto out; |
9814 | } | |
05f3fb3c | 9815 | } |
edafccee JA |
9816 | |
9817 | switch (opcode) { | |
9818 | case IORING_REGISTER_BUFFERS: | |
0a96bbe4 | 9819 | ret = io_sqe_buffers_register(ctx, arg, nr_args); |
edafccee JA |
9820 | break; |
9821 | case IORING_UNREGISTER_BUFFERS: | |
9822 | ret = -EINVAL; | |
9823 | if (arg || nr_args) | |
9824 | break; | |
0a96bbe4 | 9825 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 9826 | break; |
6b06314c JA |
9827 | case IORING_REGISTER_FILES: |
9828 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9829 | break; | |
9830 | case IORING_UNREGISTER_FILES: | |
9831 | ret = -EINVAL; | |
9832 | if (arg || nr_args) | |
9833 | break; | |
9834 | ret = io_sqe_files_unregister(ctx); | |
9835 | break; | |
c3a31e60 JA |
9836 | case IORING_REGISTER_FILES_UPDATE: |
9837 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9838 | break; | |
9b402849 | 9839 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9840 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9841 | ret = -EINVAL; |
9842 | if (nr_args != 1) | |
9843 | break; | |
9844 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9845 | if (ret) |
9846 | break; | |
9847 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9848 | ctx->eventfd_async = 1; | |
9849 | else | |
9850 | ctx->eventfd_async = 0; | |
9b402849 JA |
9851 | break; |
9852 | case IORING_UNREGISTER_EVENTFD: | |
9853 | ret = -EINVAL; | |
9854 | if (arg || nr_args) | |
9855 | break; | |
9856 | ret = io_eventfd_unregister(ctx); | |
9857 | break; | |
66f4af93 JA |
9858 | case IORING_REGISTER_PROBE: |
9859 | ret = -EINVAL; | |
9860 | if (!arg || nr_args > 256) | |
9861 | break; | |
9862 | ret = io_probe(ctx, arg, nr_args); | |
9863 | break; | |
071698e1 JA |
9864 | case IORING_REGISTER_PERSONALITY: |
9865 | ret = -EINVAL; | |
9866 | if (arg || nr_args) | |
9867 | break; | |
9868 | ret = io_register_personality(ctx); | |
9869 | break; | |
9870 | case IORING_UNREGISTER_PERSONALITY: | |
9871 | ret = -EINVAL; | |
9872 | if (arg) | |
9873 | break; | |
9874 | ret = io_unregister_personality(ctx, nr_args); | |
9875 | break; | |
7e84e1c7 SG |
9876 | case IORING_REGISTER_ENABLE_RINGS: |
9877 | ret = -EINVAL; | |
9878 | if (arg || nr_args) | |
9879 | break; | |
9880 | ret = io_register_enable_rings(ctx); | |
9881 | break; | |
21b55dbc SG |
9882 | case IORING_REGISTER_RESTRICTIONS: |
9883 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9884 | break; | |
edafccee JA |
9885 | default: |
9886 | ret = -EINVAL; | |
9887 | break; | |
9888 | } | |
9889 | ||
21b55dbc | 9890 | out: |
071698e1 | 9891 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9892 | /* bring the ctx back to life */ |
05f3fb3c | 9893 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9894 | out_quiesce: |
0f158b4c | 9895 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9896 | } |
edafccee JA |
9897 | return ret; |
9898 | } | |
9899 | ||
9900 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9901 | void __user *, arg, unsigned int, nr_args) | |
9902 | { | |
9903 | struct io_ring_ctx *ctx; | |
9904 | long ret = -EBADF; | |
9905 | struct fd f; | |
9906 | ||
9907 | f = fdget(fd); | |
9908 | if (!f.file) | |
9909 | return -EBADF; | |
9910 | ||
9911 | ret = -EOPNOTSUPP; | |
9912 | if (f.file->f_op != &io_uring_fops) | |
9913 | goto out_fput; | |
9914 | ||
9915 | ctx = f.file->private_data; | |
9916 | ||
b6c23dd5 PB |
9917 | io_run_task_work(); |
9918 | ||
edafccee JA |
9919 | mutex_lock(&ctx->uring_lock); |
9920 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9921 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9922 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9923 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9924 | out_fput: |
9925 | fdput(f); | |
9926 | return ret; | |
9927 | } | |
9928 | ||
2b188cc1 JA |
9929 | static int __init io_uring_init(void) |
9930 | { | |
d7f62e82 SM |
9931 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9932 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9933 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9934 | } while (0) | |
9935 | ||
9936 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9937 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9938 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9939 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9940 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9941 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9942 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9943 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9944 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9945 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9946 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9947 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9948 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9949 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9950 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9951 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9952 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9953 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9954 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9955 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9956 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9957 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9958 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9959 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9960 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9961 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9962 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9963 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9964 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9965 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9966 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9967 | |
d3656344 | 9968 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9969 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
91f245d5 JA |
9970 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
9971 | SLAB_ACCOUNT); | |
2b188cc1 JA |
9972 | return 0; |
9973 | }; | |
9974 | __initcall(io_uring_init); |