Commit | Line | Data |
---|---|---|
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> | |
6c271ce2 | 60 | #include <linux/kthread.h> |
2b188cc1 | 61 | #include <linux/blkdev.h> |
edafccee | 62 | #include <linux/bvec.h> |
2b188cc1 JA |
63 | #include <linux/net.h> |
64 | #include <net/sock.h> | |
65 | #include <net/af_unix.h> | |
6b06314c | 66 | #include <net/scm.h> |
2b188cc1 JA |
67 | #include <linux/anon_inodes.h> |
68 | #include <linux/sched/mm.h> | |
69 | #include <linux/uaccess.h> | |
70 | #include <linux/nospec.h> | |
edafccee JA |
71 | #include <linux/sizes.h> |
72 | #include <linux/hugetlb.h> | |
aa4c3967 | 73 | #include <linux/highmem.h> |
15b71abe JA |
74 | #include <linux/namei.h> |
75 | #include <linux/fsnotify.h> | |
4840e418 | 76 | #include <linux/fadvise.h> |
3e4827b0 | 77 | #include <linux/eventpoll.h> |
ff002b30 | 78 | #include <linux/fs_struct.h> |
7d67af2c | 79 | #include <linux/splice.h> |
b41e9852 | 80 | #include <linux/task_work.h> |
bcf5a063 | 81 | #include <linux/pagemap.h> |
0f212204 | 82 | #include <linux/io_uring.h> |
91d8f519 | 83 | #include <linux/blk-cgroup.h> |
4ea33a97 | 84 | #include <linux/audit.h> |
2b188cc1 | 85 | |
c826bd7a DD |
86 | #define CREATE_TRACE_POINTS |
87 | #include <trace/events/io_uring.h> | |
88 | ||
2b188cc1 JA |
89 | #include <uapi/linux/io_uring.h> |
90 | ||
91 | #include "internal.h" | |
561fb04a | 92 | #include "io-wq.h" |
2b188cc1 | 93 | |
5277deaa | 94 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 95 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
96 | |
97 | /* | |
98 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
99 | */ | |
100 | #define IORING_FILE_TABLE_SHIFT 9 | |
101 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
102 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
103 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
21b55dbc SG |
104 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
105 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 JA |
106 | |
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 JA |
234 | struct completion done; |
235 | }; | |
236 | ||
5a2e745d JA |
237 | struct io_buffer { |
238 | struct list_head list; | |
239 | __u64 addr; | |
240 | __s32 len; | |
241 | __u16 bid; | |
242 | }; | |
243 | ||
21b55dbc SG |
244 | struct io_restriction { |
245 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
246 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
247 | u8 sqe_flags_allowed; | |
248 | u8 sqe_flags_required; | |
7e84e1c7 | 249 | bool registered; |
21b55dbc SG |
250 | }; |
251 | ||
534ca6d6 JA |
252 | struct io_sq_data { |
253 | refcount_t refs; | |
69fb2131 JA |
254 | struct mutex lock; |
255 | ||
256 | /* ctx's that are using this sqd */ | |
257 | struct list_head ctx_list; | |
258 | struct list_head ctx_new_list; | |
259 | struct mutex ctx_lock; | |
260 | ||
534ca6d6 JA |
261 | struct task_struct *thread; |
262 | struct wait_queue_head wait; | |
08369246 XW |
263 | |
264 | unsigned sq_thread_idle; | |
534ca6d6 JA |
265 | }; |
266 | ||
258b29a9 | 267 | #define IO_IOPOLL_BATCH 8 |
6dd0be1e | 268 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 269 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 270 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
271 | |
272 | struct io_comp_state { | |
6dd0be1e | 273 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 274 | unsigned int nr; |
c7dae4ba JA |
275 | unsigned int locked_free_nr; |
276 | /* inline/task_work completion list, under ->uring_lock */ | |
1b4c351f | 277 | struct list_head free_list; |
c7dae4ba JA |
278 | /* IRQ completion list, under ->completion_lock */ |
279 | struct list_head locked_free_list; | |
258b29a9 PB |
280 | }; |
281 | ||
282 | struct io_submit_state { | |
283 | struct blk_plug plug; | |
284 | ||
285 | /* | |
286 | * io_kiocb alloc cache | |
287 | */ | |
bf019da7 | 288 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
289 | unsigned int free_reqs; |
290 | ||
291 | bool plug_started; | |
292 | ||
293 | /* | |
294 | * Batch completion logic | |
295 | */ | |
296 | struct io_comp_state comp; | |
297 | ||
298 | /* | |
299 | * File reference cache | |
300 | */ | |
301 | struct file *file; | |
302 | unsigned int fd; | |
303 | unsigned int file_refs; | |
304 | unsigned int ios_left; | |
305 | }; | |
306 | ||
2b188cc1 JA |
307 | struct io_ring_ctx { |
308 | struct { | |
309 | struct percpu_ref refs; | |
310 | } ____cacheline_aligned_in_smp; | |
311 | ||
312 | struct { | |
313 | unsigned int flags; | |
e1d85334 | 314 | unsigned int compat: 1; |
aad5d8da | 315 | unsigned int limit_mem: 1; |
e1d85334 RD |
316 | unsigned int cq_overflow_flushed: 1; |
317 | unsigned int drain_next: 1; | |
318 | unsigned int eventfd_async: 1; | |
21b55dbc | 319 | unsigned int restricted: 1; |
d9d05217 | 320 | unsigned int sqo_dead: 1; |
2b188cc1 | 321 | |
75b28aff HV |
322 | /* |
323 | * Ring buffer of indices into array of io_uring_sqe, which is | |
324 | * mmapped by the application using the IORING_OFF_SQES offset. | |
325 | * | |
326 | * This indirection could e.g. be used to assign fixed | |
327 | * io_uring_sqe entries to operations and only submit them to | |
328 | * the queue when needed. | |
329 | * | |
330 | * The kernel modifies neither the indices array nor the entries | |
331 | * array. | |
332 | */ | |
333 | u32 *sq_array; | |
2b188cc1 JA |
334 | unsigned cached_sq_head; |
335 | unsigned sq_entries; | |
336 | unsigned sq_mask; | |
6c271ce2 | 337 | unsigned sq_thread_idle; |
498ccd9e | 338 | unsigned cached_sq_dropped; |
2c3bac6d | 339 | unsigned cached_cq_overflow; |
ad3eb2c8 | 340 | unsigned long sq_check_overflow; |
de0617e4 JA |
341 | |
342 | struct list_head defer_list; | |
5262f567 | 343 | struct list_head timeout_list; |
1d7bb1d5 | 344 | struct list_head cq_overflow_list; |
fcb323cc | 345 | |
ad3eb2c8 | 346 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
347 | } ____cacheline_aligned_in_smp; |
348 | ||
3c1a2ead JA |
349 | struct { |
350 | struct mutex uring_lock; | |
351 | wait_queue_head_t wait; | |
352 | } ____cacheline_aligned_in_smp; | |
353 | ||
354 | struct io_submit_state submit_state; | |
355 | ||
206aefde JA |
356 | struct io_rings *rings; |
357 | ||
2b188cc1 | 358 | /* IO offload */ |
561fb04a | 359 | struct io_wq *io_wq; |
2aede0e4 JA |
360 | |
361 | /* | |
362 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
363 | * have access to the ->files | |
364 | */ | |
365 | struct task_struct *sqo_task; | |
366 | ||
367 | /* Only used for accounting purposes */ | |
368 | struct mm_struct *mm_account; | |
369 | ||
91d8f519 DZ |
370 | #ifdef CONFIG_BLK_CGROUP |
371 | struct cgroup_subsys_state *sqo_blkcg_css; | |
372 | #endif | |
373 | ||
534ca6d6 JA |
374 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
375 | ||
90554200 | 376 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 377 | struct list_head sqd_list; |
75b28aff | 378 | |
6b06314c JA |
379 | /* |
380 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
381 | * readers must ensure that ->refs is alive as long as the file* is | |
382 | * used. Only updated through io_uring_register(2). | |
383 | */ | |
269bbe5f | 384 | struct fixed_rsrc_data *file_data; |
6b06314c JA |
385 | unsigned nr_user_files; |
386 | ||
edafccee JA |
387 | /* if used, fixed mapped user buffers */ |
388 | unsigned nr_user_bufs; | |
389 | struct io_mapped_ubuf *user_bufs; | |
390 | ||
2b188cc1 JA |
391 | struct user_struct *user; |
392 | ||
0b8c0ec7 | 393 | const struct cred *creds; |
181e448d | 394 | |
4ea33a97 JA |
395 | #ifdef CONFIG_AUDIT |
396 | kuid_t loginuid; | |
397 | unsigned int sessionid; | |
398 | #endif | |
399 | ||
0f158b4c JA |
400 | struct completion ref_comp; |
401 | struct completion sq_thread_comp; | |
206aefde JA |
402 | |
403 | #if defined(CONFIG_UNIX) | |
404 | struct socket *ring_sock; | |
405 | #endif | |
406 | ||
5a2e745d JA |
407 | struct idr io_buffer_idr; |
408 | ||
071698e1 JA |
409 | struct idr personality_idr; |
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; | |
4a38aed2 | 445 | |
21b55dbc | 446 | struct io_restriction restrictions; |
3c1a2ead JA |
447 | |
448 | /* Keep this last, we don't need it for the fast path */ | |
449 | struct work_struct exit_work; | |
2b188cc1 JA |
450 | }; |
451 | ||
09bb8394 JA |
452 | /* |
453 | * First field must be the file pointer in all the | |
454 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
455 | */ | |
221c5eb2 JA |
456 | struct io_poll_iocb { |
457 | struct file *file; | |
018043be | 458 | struct wait_queue_head *head; |
221c5eb2 | 459 | __poll_t events; |
8c838788 | 460 | bool done; |
221c5eb2 | 461 | bool canceled; |
392edb45 | 462 | struct wait_queue_entry wait; |
221c5eb2 JA |
463 | }; |
464 | ||
018043be PB |
465 | struct io_poll_remove { |
466 | struct file *file; | |
467 | u64 addr; | |
468 | }; | |
469 | ||
b5dba59e JA |
470 | struct io_close { |
471 | struct file *file; | |
b5dba59e JA |
472 | int fd; |
473 | }; | |
474 | ||
ad8a48ac JA |
475 | struct io_timeout_data { |
476 | struct io_kiocb *req; | |
477 | struct hrtimer timer; | |
478 | struct timespec64 ts; | |
479 | enum hrtimer_mode mode; | |
480 | }; | |
481 | ||
8ed8d3c3 JA |
482 | struct io_accept { |
483 | struct file *file; | |
484 | struct sockaddr __user *addr; | |
485 | int __user *addr_len; | |
486 | int flags; | |
09952e3e | 487 | unsigned long nofile; |
8ed8d3c3 JA |
488 | }; |
489 | ||
490 | struct io_sync { | |
491 | struct file *file; | |
492 | loff_t len; | |
493 | loff_t off; | |
494 | int flags; | |
d63d1b5e | 495 | int mode; |
8ed8d3c3 JA |
496 | }; |
497 | ||
fbf23849 JA |
498 | struct io_cancel { |
499 | struct file *file; | |
500 | u64 addr; | |
501 | }; | |
502 | ||
b29472ee JA |
503 | struct io_timeout { |
504 | struct file *file; | |
bfe68a22 PB |
505 | u32 off; |
506 | u32 target_seq; | |
135fcde8 | 507 | struct list_head list; |
90cd7e42 PB |
508 | /* head of the link, used by linked timeouts only */ |
509 | struct io_kiocb *head; | |
b29472ee JA |
510 | }; |
511 | ||
0bdf7a2d PB |
512 | struct io_timeout_rem { |
513 | struct file *file; | |
514 | u64 addr; | |
9c8e11b3 PB |
515 | |
516 | /* timeout update */ | |
517 | struct timespec64 ts; | |
518 | u32 flags; | |
0bdf7a2d PB |
519 | }; |
520 | ||
9adbd45d JA |
521 | struct io_rw { |
522 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
523 | struct kiocb kiocb; | |
524 | u64 addr; | |
525 | u64 len; | |
526 | }; | |
527 | ||
3fbb51c1 JA |
528 | struct io_connect { |
529 | struct file *file; | |
530 | struct sockaddr __user *addr; | |
531 | int addr_len; | |
532 | }; | |
533 | ||
e47293fd JA |
534 | struct io_sr_msg { |
535 | struct file *file; | |
fddaface | 536 | union { |
270a5940 | 537 | struct user_msghdr __user *umsg; |
fddaface JA |
538 | void __user *buf; |
539 | }; | |
e47293fd | 540 | int msg_flags; |
bcda7baa | 541 | int bgid; |
fddaface | 542 | size_t len; |
bcda7baa | 543 | struct io_buffer *kbuf; |
e47293fd JA |
544 | }; |
545 | ||
15b71abe JA |
546 | struct io_open { |
547 | struct file *file; | |
548 | int dfd; | |
15b71abe | 549 | struct filename *filename; |
c12cedf2 | 550 | struct open_how how; |
4022e7af | 551 | unsigned long nofile; |
15b71abe JA |
552 | }; |
553 | ||
269bbe5f | 554 | struct io_rsrc_update { |
05f3fb3c JA |
555 | struct file *file; |
556 | u64 arg; | |
557 | u32 nr_args; | |
558 | u32 offset; | |
559 | }; | |
560 | ||
4840e418 JA |
561 | struct io_fadvise { |
562 | struct file *file; | |
563 | u64 offset; | |
564 | u32 len; | |
565 | u32 advice; | |
566 | }; | |
567 | ||
c1ca757b JA |
568 | struct io_madvise { |
569 | struct file *file; | |
570 | u64 addr; | |
571 | u32 len; | |
572 | u32 advice; | |
573 | }; | |
574 | ||
3e4827b0 JA |
575 | struct io_epoll { |
576 | struct file *file; | |
577 | int epfd; | |
578 | int op; | |
579 | int fd; | |
580 | struct epoll_event event; | |
e47293fd JA |
581 | }; |
582 | ||
7d67af2c PB |
583 | struct io_splice { |
584 | struct file *file_out; | |
585 | struct file *file_in; | |
586 | loff_t off_out; | |
587 | loff_t off_in; | |
588 | u64 len; | |
589 | unsigned int flags; | |
590 | }; | |
591 | ||
ddf0322d JA |
592 | struct io_provide_buf { |
593 | struct file *file; | |
594 | __u64 addr; | |
595 | __s32 len; | |
596 | __u32 bgid; | |
597 | __u16 nbufs; | |
598 | __u16 bid; | |
599 | }; | |
600 | ||
1d9e1288 BM |
601 | struct io_statx { |
602 | struct file *file; | |
603 | int dfd; | |
604 | unsigned int mask; | |
605 | unsigned int flags; | |
e62753e4 | 606 | const char __user *filename; |
1d9e1288 BM |
607 | struct statx __user *buffer; |
608 | }; | |
609 | ||
36f4fa68 JA |
610 | struct io_shutdown { |
611 | struct file *file; | |
612 | int how; | |
613 | }; | |
614 | ||
80a261fd JA |
615 | struct io_rename { |
616 | struct file *file; | |
617 | int old_dfd; | |
618 | int new_dfd; | |
619 | struct filename *oldpath; | |
620 | struct filename *newpath; | |
621 | int flags; | |
622 | }; | |
623 | ||
14a1143b JA |
624 | struct io_unlink { |
625 | struct file *file; | |
626 | int dfd; | |
627 | int flags; | |
628 | struct filename *filename; | |
629 | }; | |
630 | ||
3ca405eb PB |
631 | struct io_completion { |
632 | struct file *file; | |
633 | struct list_head list; | |
0f7e466b | 634 | int cflags; |
3ca405eb PB |
635 | }; |
636 | ||
f499a021 JA |
637 | struct io_async_connect { |
638 | struct sockaddr_storage address; | |
639 | }; | |
640 | ||
03b1230c JA |
641 | struct io_async_msghdr { |
642 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
643 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
644 | struct iovec *free_iov; | |
03b1230c JA |
645 | struct sockaddr __user *uaddr; |
646 | struct msghdr msg; | |
b537916c | 647 | struct sockaddr_storage addr; |
03b1230c JA |
648 | }; |
649 | ||
f67676d1 JA |
650 | struct io_async_rw { |
651 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
652 | const struct iovec *free_iovec; |
653 | struct iov_iter iter; | |
227c0c96 | 654 | size_t bytes_done; |
bcf5a063 | 655 | struct wait_page_queue wpq; |
f67676d1 JA |
656 | }; |
657 | ||
6b47ee6e PB |
658 | enum { |
659 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
660 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
661 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
662 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
663 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 664 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 665 | |
6b47ee6e PB |
666 | REQ_F_FAIL_LINK_BIT, |
667 | REQ_F_INFLIGHT_BIT, | |
668 | REQ_F_CUR_POS_BIT, | |
669 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 670 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 671 | REQ_F_ISREG_BIT, |
99bc4c38 | 672 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 673 | REQ_F_POLLED_BIT, |
bcda7baa | 674 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 675 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 676 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 677 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 678 | REQ_F_COMPLETE_INLINE_BIT, |
84557871 JA |
679 | |
680 | /* not a real bit, just to check we're not overflowing the space */ | |
681 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
682 | }; |
683 | ||
684 | enum { | |
685 | /* ctx owns file */ | |
686 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
687 | /* drain existing IO first */ | |
688 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
689 | /* linked sqes */ | |
690 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
691 | /* doesn't sever on completion < 0 */ | |
692 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
693 | /* IOSQE_ASYNC */ | |
694 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
695 | /* IOSQE_BUFFER_SELECT */ |
696 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 697 | |
6b47ee6e PB |
698 | /* fail rest of links */ |
699 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
700 | /* on inflight list */ | |
701 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
702 | /* read/write uses file position */ | |
703 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
704 | /* must not punt to workers */ | |
705 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 706 | /* has or had linked timeout */ |
6b47ee6e | 707 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
708 | /* regular file */ |
709 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
710 | /* needs cleanup */ |
711 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
712 | /* already went through poll handler */ |
713 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
714 | /* buffer already selected */ |
715 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
716 | /* doesn't need file table for this request */ |
717 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
718 | /* io_wq_work is initialized */ |
719 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
720 | /* linked timeout is active, i.e. prepared by link's head */ |
721 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
722 | /* completion is deferred through io_comp_state */ |
723 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
d7718a9d JA |
724 | }; |
725 | ||
726 | struct async_poll { | |
727 | struct io_poll_iocb poll; | |
807abcb0 | 728 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
729 | }; |
730 | ||
7cbf1722 JA |
731 | struct io_task_work { |
732 | struct io_wq_work_node node; | |
733 | task_work_func_t func; | |
734 | }; | |
735 | ||
09bb8394 JA |
736 | /* |
737 | * NOTE! Each of the iocb union members has the file pointer | |
738 | * as the first entry in their struct definition. So you can | |
739 | * access the file pointer through any of the sub-structs, | |
740 | * or directly as just 'ki_filp' in this struct. | |
741 | */ | |
2b188cc1 | 742 | struct io_kiocb { |
221c5eb2 | 743 | union { |
09bb8394 | 744 | struct file *file; |
9adbd45d | 745 | struct io_rw rw; |
221c5eb2 | 746 | struct io_poll_iocb poll; |
018043be | 747 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
748 | struct io_accept accept; |
749 | struct io_sync sync; | |
fbf23849 | 750 | struct io_cancel cancel; |
b29472ee | 751 | struct io_timeout timeout; |
0bdf7a2d | 752 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 753 | struct io_connect connect; |
e47293fd | 754 | struct io_sr_msg sr_msg; |
15b71abe | 755 | struct io_open open; |
b5dba59e | 756 | struct io_close close; |
269bbe5f | 757 | struct io_rsrc_update rsrc_update; |
4840e418 | 758 | struct io_fadvise fadvise; |
c1ca757b | 759 | struct io_madvise madvise; |
3e4827b0 | 760 | struct io_epoll epoll; |
7d67af2c | 761 | struct io_splice splice; |
ddf0322d | 762 | struct io_provide_buf pbuf; |
1d9e1288 | 763 | struct io_statx statx; |
36f4fa68 | 764 | struct io_shutdown shutdown; |
80a261fd | 765 | struct io_rename rename; |
14a1143b | 766 | struct io_unlink unlink; |
3ca405eb PB |
767 | /* use only after cleaning per-op data, see io_clean_op() */ |
768 | struct io_completion compl; | |
221c5eb2 | 769 | }; |
2b188cc1 | 770 | |
e8c2bc1f JA |
771 | /* opcode allocated if it needs to store data for async defer */ |
772 | void *async_data; | |
d625c6ee | 773 | u8 opcode; |
65a6543d XW |
774 | /* polled IO has completed */ |
775 | u8 iopoll_completed; | |
2b188cc1 | 776 | |
4f4eeba8 | 777 | u16 buf_index; |
9cf7c104 | 778 | u32 result; |
4f4eeba8 | 779 | |
010e8e6b PB |
780 | struct io_ring_ctx *ctx; |
781 | unsigned int flags; | |
782 | refcount_t refs; | |
783 | struct task_struct *task; | |
784 | u64 user_data; | |
d7718a9d | 785 | |
f2f87370 | 786 | struct io_kiocb *link; |
269bbe5f | 787 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 788 | |
d21ffe7e PB |
789 | /* |
790 | * 1. used with ctx->iopoll_list with reads/writes | |
791 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
792 | */ | |
010e8e6b | 793 | struct list_head inflight_entry; |
7cbf1722 JA |
794 | union { |
795 | struct io_task_work io_task_work; | |
796 | struct callback_head task_work; | |
797 | }; | |
010e8e6b PB |
798 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
799 | struct hlist_node hash_node; | |
800 | struct async_poll *apoll; | |
801 | struct io_wq_work work; | |
2b188cc1 | 802 | }; |
05589553 | 803 | |
27dc8338 PB |
804 | struct io_defer_entry { |
805 | struct list_head list; | |
806 | struct io_kiocb *req; | |
9cf7c104 | 807 | u32 seq; |
2b188cc1 JA |
808 | }; |
809 | ||
d3656344 | 810 | struct io_op_def { |
d3656344 JA |
811 | /* needs req->file assigned */ |
812 | unsigned needs_file : 1; | |
d3656344 JA |
813 | /* hash wq insertion if file is a regular file */ |
814 | unsigned hash_reg_file : 1; | |
815 | /* unbound wq insertion if file is a non-regular file */ | |
816 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
817 | /* opcode is not supported by this kernel */ |
818 | unsigned not_supported : 1; | |
8a72758c JA |
819 | /* set if opcode supports polled "wait" */ |
820 | unsigned pollin : 1; | |
821 | unsigned pollout : 1; | |
bcda7baa JA |
822 | /* op supports buffer selection */ |
823 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
824 | /* must always have async data allocated */ |
825 | unsigned needs_async_data : 1; | |
27926b68 JA |
826 | /* should block plug */ |
827 | unsigned plug : 1; | |
e8c2bc1f JA |
828 | /* size of async data needed, if any */ |
829 | unsigned short async_size; | |
0f203765 | 830 | unsigned work_flags; |
d3656344 JA |
831 | }; |
832 | ||
0918682b | 833 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
834 | [IORING_OP_NOP] = {}, |
835 | [IORING_OP_READV] = { | |
d3656344 JA |
836 | .needs_file = 1, |
837 | .unbound_nonreg_file = 1, | |
8a72758c | 838 | .pollin = 1, |
4d954c25 | 839 | .buffer_select = 1, |
e8c2bc1f | 840 | .needs_async_data = 1, |
27926b68 | 841 | .plug = 1, |
e8c2bc1f | 842 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 843 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 844 | }, |
0463b6c5 | 845 | [IORING_OP_WRITEV] = { |
d3656344 JA |
846 | .needs_file = 1, |
847 | .hash_reg_file = 1, | |
848 | .unbound_nonreg_file = 1, | |
8a72758c | 849 | .pollout = 1, |
e8c2bc1f | 850 | .needs_async_data = 1, |
27926b68 | 851 | .plug = 1, |
e8c2bc1f | 852 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
853 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
854 | IO_WQ_WORK_FSIZE, | |
d3656344 | 855 | }, |
0463b6c5 | 856 | [IORING_OP_FSYNC] = { |
d3656344 | 857 | .needs_file = 1, |
0f203765 | 858 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 859 | }, |
0463b6c5 | 860 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
861 | .needs_file = 1, |
862 | .unbound_nonreg_file = 1, | |
8a72758c | 863 | .pollin = 1, |
27926b68 | 864 | .plug = 1, |
e8c2bc1f | 865 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 866 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 867 | }, |
0463b6c5 | 868 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
869 | .needs_file = 1, |
870 | .hash_reg_file = 1, | |
871 | .unbound_nonreg_file = 1, | |
8a72758c | 872 | .pollout = 1, |
27926b68 | 873 | .plug = 1, |
e8c2bc1f | 874 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
875 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
876 | IO_WQ_WORK_MM, | |
d3656344 | 877 | }, |
0463b6c5 | 878 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
879 | .needs_file = 1, |
880 | .unbound_nonreg_file = 1, | |
881 | }, | |
0463b6c5 PB |
882 | [IORING_OP_POLL_REMOVE] = {}, |
883 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 884 | .needs_file = 1, |
0f203765 | 885 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 886 | }, |
0463b6c5 | 887 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
888 | .needs_file = 1, |
889 | .unbound_nonreg_file = 1, | |
8a72758c | 890 | .pollout = 1, |
e8c2bc1f JA |
891 | .needs_async_data = 1, |
892 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 893 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 894 | }, |
0463b6c5 | 895 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
896 | .needs_file = 1, |
897 | .unbound_nonreg_file = 1, | |
8a72758c | 898 | .pollin = 1, |
52de1fe1 | 899 | .buffer_select = 1, |
e8c2bc1f JA |
900 | .needs_async_data = 1, |
901 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 902 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 903 | }, |
0463b6c5 | 904 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
905 | .needs_async_data = 1, |
906 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 907 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 908 | }, |
9c8e11b3 PB |
909 | [IORING_OP_TIMEOUT_REMOVE] = { |
910 | /* used by timeout updates' prep() */ | |
911 | .work_flags = IO_WQ_WORK_MM, | |
912 | }, | |
0463b6c5 | 913 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
914 | .needs_file = 1, |
915 | .unbound_nonreg_file = 1, | |
8a72758c | 916 | .pollin = 1, |
0f203765 | 917 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 918 | }, |
0463b6c5 PB |
919 | [IORING_OP_ASYNC_CANCEL] = {}, |
920 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
921 | .needs_async_data = 1, |
922 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 923 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 924 | }, |
0463b6c5 | 925 | [IORING_OP_CONNECT] = { |
d3656344 JA |
926 | .needs_file = 1, |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollout = 1, |
e8c2bc1f JA |
929 | .needs_async_data = 1, |
930 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 931 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 932 | }, |
0463b6c5 | 933 | [IORING_OP_FALLOCATE] = { |
d3656344 | 934 | .needs_file = 1, |
69228338 | 935 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 936 | }, |
0463b6c5 | 937 | [IORING_OP_OPENAT] = { |
0f203765 | 938 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 939 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 940 | }, |
0463b6c5 | 941 | [IORING_OP_CLOSE] = { |
0f203765 | 942 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 943 | }, |
0463b6c5 | 944 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 945 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 946 | }, |
0463b6c5 | 947 | [IORING_OP_STATX] = { |
0f203765 JA |
948 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
949 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 950 | }, |
0463b6c5 | 951 | [IORING_OP_READ] = { |
3a6820f2 JA |
952 | .needs_file = 1, |
953 | .unbound_nonreg_file = 1, | |
8a72758c | 954 | .pollin = 1, |
bcda7baa | 955 | .buffer_select = 1, |
27926b68 | 956 | .plug = 1, |
e8c2bc1f | 957 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 958 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 959 | }, |
0463b6c5 | 960 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
961 | .needs_file = 1, |
962 | .unbound_nonreg_file = 1, | |
8a72758c | 963 | .pollout = 1, |
27926b68 | 964 | .plug = 1, |
e8c2bc1f | 965 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
966 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
967 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 968 | }, |
0463b6c5 | 969 | [IORING_OP_FADVISE] = { |
4840e418 | 970 | .needs_file = 1, |
0f203765 | 971 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 972 | }, |
0463b6c5 | 973 | [IORING_OP_MADVISE] = { |
0f203765 | 974 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 975 | }, |
0463b6c5 | 976 | [IORING_OP_SEND] = { |
fddaface JA |
977 | .needs_file = 1, |
978 | .unbound_nonreg_file = 1, | |
8a72758c | 979 | .pollout = 1, |
0f203765 | 980 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 981 | }, |
0463b6c5 | 982 | [IORING_OP_RECV] = { |
fddaface JA |
983 | .needs_file = 1, |
984 | .unbound_nonreg_file = 1, | |
8a72758c | 985 | .pollin = 1, |
bcda7baa | 986 | .buffer_select = 1, |
0f203765 | 987 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 988 | }, |
0463b6c5 | 989 | [IORING_OP_OPENAT2] = { |
0f203765 | 990 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 991 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 992 | }, |
3e4827b0 JA |
993 | [IORING_OP_EPOLL_CTL] = { |
994 | .unbound_nonreg_file = 1, | |
0f203765 | 995 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 996 | }, |
7d67af2c PB |
997 | [IORING_OP_SPLICE] = { |
998 | .needs_file = 1, | |
999 | .hash_reg_file = 1, | |
1000 | .unbound_nonreg_file = 1, | |
0f203765 | 1001 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
1002 | }, |
1003 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1004 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1005 | [IORING_OP_TEE] = { |
1006 | .needs_file = 1, | |
1007 | .hash_reg_file = 1, | |
1008 | .unbound_nonreg_file = 1, | |
1009 | }, | |
36f4fa68 JA |
1010 | [IORING_OP_SHUTDOWN] = { |
1011 | .needs_file = 1, | |
1012 | }, | |
80a261fd JA |
1013 | [IORING_OP_RENAMEAT] = { |
1014 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
1015 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
1016 | }, | |
14a1143b JA |
1017 | [IORING_OP_UNLINKAT] = { |
1018 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
1019 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
1020 | }, | |
d3656344 JA |
1021 | }; |
1022 | ||
9936c7c2 PB |
1023 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1024 | struct task_struct *task, | |
1025 | struct files_struct *files); | |
269bbe5f | 1026 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node); |
bc9744cd | 1027 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
1ffc5422 | 1028 | struct io_ring_ctx *ctx); |
bc9744cd PB |
1029 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
1030 | struct fixed_rsrc_ref_node *ref_node); | |
1ffc5422 | 1031 | |
f161340d | 1032 | static bool io_rw_reissue(struct io_kiocb *req, long res); |
78e19bbe | 1033 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 1034 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1035 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 1036 | static void io_double_put_req(struct io_kiocb *req); |
c7dae4ba JA |
1037 | static void io_dismantle_req(struct io_kiocb *req); |
1038 | static void io_put_task(struct task_struct *task, int nr); | |
1039 | static void io_queue_next(struct io_kiocb *req); | |
94ae5e77 | 1040 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 1041 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 1042 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c | 1043 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 1044 | struct io_uring_rsrc_update *ip, |
05f3fb3c | 1045 | unsigned nr_args); |
3ca405eb | 1046 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1047 | static struct file *io_file_get(struct io_submit_state *state, |
1048 | struct io_kiocb *req, int fd, bool fixed); | |
c5eef2b9 | 1049 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1050 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1051 | |
847595de PB |
1052 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
1053 | struct iov_iter *iter, bool needs_lock); | |
ff6165b2 JA |
1054 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1055 | const struct iovec *fast_iov, | |
227c0c96 | 1056 | struct iov_iter *iter, bool force); |
907d1df3 | 1057 | static void io_req_task_queue(struct io_kiocb *req); |
65453d1e JA |
1058 | static void io_submit_flush_completions(struct io_comp_state *cs, |
1059 | struct io_ring_ctx *ctx); | |
de0617e4 | 1060 | |
2b188cc1 JA |
1061 | static struct kmem_cache *req_cachep; |
1062 | ||
0918682b | 1063 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1064 | |
1065 | struct sock *io_uring_get_socket(struct file *file) | |
1066 | { | |
1067 | #if defined(CONFIG_UNIX) | |
1068 | if (file->f_op == &io_uring_fops) { | |
1069 | struct io_ring_ctx *ctx = file->private_data; | |
1070 | ||
1071 | return ctx->ring_sock->sk; | |
1072 | } | |
1073 | #endif | |
1074 | return NULL; | |
1075 | } | |
1076 | EXPORT_SYMBOL(io_uring_get_socket); | |
1077 | ||
f2f87370 PB |
1078 | #define io_for_each_link(pos, head) \ |
1079 | for (pos = (head); pos; pos = pos->link) | |
1080 | ||
3ca405eb PB |
1081 | static inline void io_clean_op(struct io_kiocb *req) |
1082 | { | |
9d5c8190 | 1083 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
3ca405eb PB |
1084 | __io_clean_op(req); |
1085 | } | |
1086 | ||
36f72fe2 PB |
1087 | static inline void io_set_resource_node(struct io_kiocb *req) |
1088 | { | |
1089 | struct io_ring_ctx *ctx = req->ctx; | |
1090 | ||
269bbe5f BM |
1091 | if (!req->fixed_rsrc_refs) { |
1092 | req->fixed_rsrc_refs = &ctx->file_data->node->refs; | |
1093 | percpu_ref_get(req->fixed_rsrc_refs); | |
36f72fe2 PB |
1094 | } |
1095 | } | |
1096 | ||
08d23634 PB |
1097 | static bool io_match_task(struct io_kiocb *head, |
1098 | struct task_struct *task, | |
1099 | struct files_struct *files) | |
1100 | { | |
1101 | struct io_kiocb *req; | |
1102 | ||
84965ff8 JA |
1103 | if (task && head->task != task) { |
1104 | /* in terms of cancelation, always match if req task is dead */ | |
1105 | if (head->task->flags & PF_EXITING) | |
1106 | return true; | |
08d23634 | 1107 | return false; |
84965ff8 | 1108 | } |
08d23634 PB |
1109 | if (!files) |
1110 | return true; | |
1111 | ||
1112 | io_for_each_link(req, head) { | |
02a13674 JA |
1113 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1114 | continue; | |
1115 | if (req->file && req->file->f_op == &io_uring_fops) | |
1116 | return true; | |
1117 | if ((req->work.flags & IO_WQ_WORK_FILES) && | |
08d23634 PB |
1118 | req->work.identity->files == files) |
1119 | return true; | |
1120 | } | |
1121 | return false; | |
1122 | } | |
1123 | ||
28cea78a | 1124 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1125 | { |
28cea78a | 1126 | struct files_struct *files = current->files; |
c40f6379 JA |
1127 | struct mm_struct *mm = current->mm; |
1128 | ||
1129 | if (mm) { | |
1130 | kthread_unuse_mm(mm); | |
1131 | mmput(mm); | |
4b70cf9d | 1132 | current->mm = NULL; |
c40f6379 | 1133 | } |
28cea78a JA |
1134 | if (files) { |
1135 | struct nsproxy *nsproxy = current->nsproxy; | |
1136 | ||
1137 | task_lock(current); | |
1138 | current->files = NULL; | |
1139 | current->nsproxy = NULL; | |
1140 | task_unlock(current); | |
1141 | put_files_struct(files); | |
1142 | put_nsproxy(nsproxy); | |
1143 | } | |
1144 | } | |
1145 | ||
1a38ffc9 | 1146 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a | 1147 | { |
621fadc2 PB |
1148 | if (current->flags & PF_EXITING) |
1149 | return -EFAULT; | |
1150 | ||
28cea78a JA |
1151 | if (!current->files) { |
1152 | struct files_struct *files; | |
1153 | struct nsproxy *nsproxy; | |
1154 | ||
1155 | task_lock(ctx->sqo_task); | |
1156 | files = ctx->sqo_task->files; | |
1157 | if (!files) { | |
1158 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1159 | return -EOWNERDEAD; |
28cea78a JA |
1160 | } |
1161 | atomic_inc(&files->count); | |
1162 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1163 | nsproxy = ctx->sqo_task->nsproxy; | |
1164 | task_unlock(ctx->sqo_task); | |
1165 | ||
1166 | task_lock(current); | |
1167 | current->files = files; | |
1168 | current->nsproxy = nsproxy; | |
1169 | task_unlock(current); | |
1170 | } | |
1a38ffc9 | 1171 | return 0; |
c40f6379 JA |
1172 | } |
1173 | ||
1174 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1175 | { | |
4b70cf9d JA |
1176 | struct mm_struct *mm; |
1177 | ||
621fadc2 PB |
1178 | if (current->flags & PF_EXITING) |
1179 | return -EFAULT; | |
4b70cf9d JA |
1180 | if (current->mm) |
1181 | return 0; | |
1182 | ||
1183 | /* Should never happen */ | |
1184 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1185 | return -EFAULT; | |
1186 | ||
1187 | task_lock(ctx->sqo_task); | |
1188 | mm = ctx->sqo_task->mm; | |
1189 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1190 | mm = NULL; | |
1191 | task_unlock(ctx->sqo_task); | |
1192 | ||
1193 | if (mm) { | |
1194 | kthread_use_mm(mm); | |
1195 | return 0; | |
c40f6379 JA |
1196 | } |
1197 | ||
4b70cf9d | 1198 | return -EFAULT; |
c40f6379 JA |
1199 | } |
1200 | ||
28cea78a JA |
1201 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1202 | struct io_kiocb *req) | |
c40f6379 | 1203 | { |
28cea78a | 1204 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1205 | int ret; |
28cea78a JA |
1206 | |
1207 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1208 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1209 | if (unlikely(ret)) |
1210 | return ret; | |
1211 | } | |
1212 | ||
1a38ffc9 PB |
1213 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1214 | ret = __io_sq_thread_acquire_files(ctx); | |
1215 | if (unlikely(ret)) | |
1216 | return ret; | |
1217 | } | |
28cea78a JA |
1218 | |
1219 | return 0; | |
c40f6379 JA |
1220 | } |
1221 | ||
91d8f519 DZ |
1222 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1223 | struct cgroup_subsys_state **cur_css) | |
1224 | ||
1225 | { | |
1226 | #ifdef CONFIG_BLK_CGROUP | |
1227 | /* puts the old one when swapping */ | |
1228 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1229 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1230 | *cur_css = ctx->sqo_blkcg_css; | |
1231 | } | |
1232 | #endif | |
1233 | } | |
1234 | ||
1235 | static void io_sq_thread_unassociate_blkcg(void) | |
1236 | { | |
1237 | #ifdef CONFIG_BLK_CGROUP | |
1238 | kthread_associate_blkcg(NULL); | |
1239 | #endif | |
1240 | } | |
1241 | ||
c40f6379 JA |
1242 | static inline void req_set_fail_links(struct io_kiocb *req) |
1243 | { | |
1244 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1245 | req->flags |= REQ_F_FAIL_LINK; | |
1246 | } | |
4a38aed2 | 1247 | |
1e6fa521 JA |
1248 | /* |
1249 | * None of these are dereferenced, they are simply used to check if any of | |
1250 | * them have changed. If we're under current and check they are still the | |
1251 | * same, we're fine to grab references to them for actual out-of-line use. | |
1252 | */ | |
1253 | static void io_init_identity(struct io_identity *id) | |
1254 | { | |
1255 | id->files = current->files; | |
1256 | id->mm = current->mm; | |
1257 | #ifdef CONFIG_BLK_CGROUP | |
1258 | rcu_read_lock(); | |
1259 | id->blkcg_css = blkcg_css(); | |
1260 | rcu_read_unlock(); | |
1261 | #endif | |
1262 | id->creds = current_cred(); | |
1263 | id->nsproxy = current->nsproxy; | |
1264 | id->fs = current->fs; | |
1265 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1266 | #ifdef CONFIG_AUDIT |
1267 | id->loginuid = current->loginuid; | |
1268 | id->sessionid = current->sessionid; | |
1269 | #endif | |
1e6fa521 JA |
1270 | refcount_set(&id->count, 1); |
1271 | } | |
1272 | ||
ec99ca6c PB |
1273 | static inline void __io_req_init_async(struct io_kiocb *req) |
1274 | { | |
1275 | memset(&req->work, 0, sizeof(req->work)); | |
1276 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1277 | } | |
1278 | ||
7cdaf587 XW |
1279 | /* |
1280 | * Note: must call io_req_init_async() for the first time you | |
1281 | * touch any members of io_wq_work. | |
1282 | */ | |
1283 | static inline void io_req_init_async(struct io_kiocb *req) | |
1284 | { | |
500a373d JA |
1285 | struct io_uring_task *tctx = current->io_uring; |
1286 | ||
7cdaf587 XW |
1287 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1288 | return; | |
1289 | ||
ec99ca6c | 1290 | __io_req_init_async(req); |
500a373d JA |
1291 | |
1292 | /* Grab a ref if this isn't our static identity */ | |
1293 | req->work.identity = tctx->identity; | |
1294 | if (tctx->identity != &tctx->__identity) | |
1295 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1296 | } |
1297 | ||
2b188cc1 JA |
1298 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1299 | { | |
1300 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1301 | ||
0f158b4c | 1302 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1303 | } |
1304 | ||
8eb7e2d0 PB |
1305 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1306 | { | |
1307 | return !req->timeout.off; | |
1308 | } | |
1309 | ||
2b188cc1 JA |
1310 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1311 | { | |
1312 | struct io_ring_ctx *ctx; | |
78076bb6 | 1313 | int hash_bits; |
2b188cc1 JA |
1314 | |
1315 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1316 | if (!ctx) | |
1317 | return NULL; | |
1318 | ||
78076bb6 JA |
1319 | /* |
1320 | * Use 5 bits less than the max cq entries, that should give us around | |
1321 | * 32 entries per hash list if totally full and uniformly spread. | |
1322 | */ | |
1323 | hash_bits = ilog2(p->cq_entries); | |
1324 | hash_bits -= 5; | |
1325 | if (hash_bits <= 0) | |
1326 | hash_bits = 1; | |
1327 | ctx->cancel_hash_bits = hash_bits; | |
1328 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1329 | GFP_KERNEL); | |
1330 | if (!ctx->cancel_hash) | |
1331 | goto err; | |
1332 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1333 | ||
21482896 | 1334 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1335 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1336 | goto err; | |
2b188cc1 JA |
1337 | |
1338 | ctx->flags = p->flags; | |
90554200 | 1339 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1340 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1341 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1342 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1343 | init_completion(&ctx->ref_comp); |
1344 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1345 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1346 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1347 | mutex_init(&ctx->uring_lock); |
1348 | init_waitqueue_head(&ctx->wait); | |
1349 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1350 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1351 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1352 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1353 | spin_lock_init(&ctx->inflight_lock); |
1354 | INIT_LIST_HEAD(&ctx->inflight_list); | |
d67d2263 BM |
1355 | spin_lock_init(&ctx->rsrc_ref_lock); |
1356 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1357 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1358 | init_llist_head(&ctx->rsrc_put_llist); | |
1b4c351f | 1359 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
c7dae4ba | 1360 | INIT_LIST_HEAD(&ctx->submit_state.comp.locked_free_list); |
2b188cc1 | 1361 | return ctx; |
206aefde | 1362 | err: |
78076bb6 | 1363 | kfree(ctx->cancel_hash); |
206aefde JA |
1364 | kfree(ctx); |
1365 | return NULL; | |
2b188cc1 JA |
1366 | } |
1367 | ||
9cf7c104 | 1368 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1369 | { |
2bc9930e JA |
1370 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1371 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1372 | |
9cf7c104 | 1373 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1374 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1375 | } |
de0617e4 | 1376 | |
9d858b21 | 1377 | return false; |
de0617e4 JA |
1378 | } |
1379 | ||
5c3462cf | 1380 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1381 | { |
500a373d | 1382 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1383 | return; |
1384 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1385 | kfree(req->work.identity); | |
1386 | } | |
1387 | ||
4edf20f9 | 1388 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1389 | { |
7cdaf587 | 1390 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1391 | return; |
51a4cc11 | 1392 | |
e86d0047 | 1393 | if (req->work.flags & IO_WQ_WORK_MM) |
98447d65 | 1394 | mmdrop(req->work.identity->mm); |
91d8f519 | 1395 | #ifdef CONFIG_BLK_CGROUP |
e86d0047 | 1396 | if (req->work.flags & IO_WQ_WORK_BLKCG) |
98447d65 | 1397 | css_put(req->work.identity->blkcg_css); |
91d8f519 | 1398 | #endif |
e86d0047 | 1399 | if (req->work.flags & IO_WQ_WORK_CREDS) |
98447d65 | 1400 | put_cred(req->work.identity->creds); |
dfead8a8 | 1401 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1402 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1403 | |
98447d65 | 1404 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1405 | if (--fs->users) |
1406 | fs = NULL; | |
98447d65 | 1407 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1408 | if (fs) |
1409 | free_fs_struct(fs); | |
1410 | } | |
34e08fed PB |
1411 | if (req->work.flags & IO_WQ_WORK_FILES) { |
1412 | put_files_struct(req->work.identity->files); | |
1413 | put_nsproxy(req->work.identity->nsproxy); | |
34e08fed PB |
1414 | } |
1415 | if (req->flags & REQ_F_INFLIGHT) { | |
1416 | struct io_ring_ctx *ctx = req->ctx; | |
1417 | struct io_uring_task *tctx = req->task->io_uring; | |
1418 | unsigned long flags; | |
1419 | ||
1420 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1421 | list_del(&req->inflight_entry); | |
1422 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1423 | req->flags &= ~REQ_F_INFLIGHT; | |
1424 | if (atomic_read(&tctx->in_idle)) | |
1425 | wake_up(&tctx->wait); | |
1426 | } | |
51a4cc11 | 1427 | |
e86d0047 PB |
1428 | req->flags &= ~REQ_F_WORK_INITIALIZED; |
1429 | req->work.flags &= ~(IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | IO_WQ_WORK_FS | | |
1430 | IO_WQ_WORK_CREDS | IO_WQ_WORK_FILES); | |
5c3462cf | 1431 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1432 | } |
1433 | ||
1e6fa521 JA |
1434 | /* |
1435 | * Create a private copy of io_identity, since some fields don't match | |
1436 | * the current context. | |
1437 | */ | |
1438 | static bool io_identity_cow(struct io_kiocb *req) | |
1439 | { | |
5c3462cf | 1440 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1441 | const struct cred *creds = NULL; |
1442 | struct io_identity *id; | |
1443 | ||
1444 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1445 | creds = req->work.identity->creds; | |
1446 | ||
1447 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1448 | if (unlikely(!id)) { | |
1449 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1450 | return false; | |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * We can safely just re-init the creds we copied Either the field | |
1455 | * matches the current one, or we haven't grabbed it yet. The only | |
1456 | * exception is ->creds, through registered personalities, so handle | |
1457 | * that one separately. | |
1458 | */ | |
1459 | io_init_identity(id); | |
1460 | if (creds) | |
e8c954df | 1461 | id->creds = creds; |
1e6fa521 JA |
1462 | |
1463 | /* add one for this request */ | |
1464 | refcount_inc(&id->count); | |
1465 | ||
cb8a8ae3 JA |
1466 | /* drop tctx and req identity references, if needed */ |
1467 | if (tctx->identity != &tctx->__identity && | |
1468 | refcount_dec_and_test(&tctx->identity->count)) | |
1469 | kfree(tctx->identity); | |
1470 | if (req->work.identity != &tctx->__identity && | |
1471 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1472 | kfree(req->work.identity); |
1473 | ||
1474 | req->work.identity = id; | |
500a373d | 1475 | tctx->identity = id; |
1e6fa521 JA |
1476 | return true; |
1477 | } | |
1478 | ||
ce3d5aae PB |
1479 | static void io_req_track_inflight(struct io_kiocb *req) |
1480 | { | |
1481 | struct io_ring_ctx *ctx = req->ctx; | |
1482 | ||
1483 | if (!(req->flags & REQ_F_INFLIGHT)) { | |
1484 | io_req_init_async(req); | |
1485 | req->flags |= REQ_F_INFLIGHT; | |
1486 | ||
1487 | spin_lock_irq(&ctx->inflight_lock); | |
1488 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1489 | spin_unlock_irq(&ctx->inflight_lock); | |
1490 | } | |
1491 | } | |
1492 | ||
1e6fa521 | 1493 | static bool io_grab_identity(struct io_kiocb *req) |
18d9be1a | 1494 | { |
d3656344 | 1495 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1496 | struct io_identity *id = req->work.identity; |
54a91f3b | 1497 | |
69228338 JA |
1498 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1499 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1500 | return false; | |
1501 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1502 | } | |
91d8f519 | 1503 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1504 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1505 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1506 | rcu_read_lock(); |
1e6fa521 JA |
1507 | if (id->blkcg_css != blkcg_css()) { |
1508 | rcu_read_unlock(); | |
1509 | return false; | |
1510 | } | |
91d8f519 DZ |
1511 | /* |
1512 | * This should be rare, either the cgroup is dying or the task | |
1513 | * is moving cgroups. Just punt to root for the handful of ios. | |
1514 | */ | |
1e6fa521 | 1515 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1516 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1517 | rcu_read_unlock(); |
1518 | } | |
1519 | #endif | |
dfead8a8 | 1520 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1521 | if (id->creds != current_cred()) |
1522 | return false; | |
1523 | get_cred(id->creds); | |
dfead8a8 JA |
1524 | req->work.flags |= IO_WQ_WORK_CREDS; |
1525 | } | |
4ea33a97 JA |
1526 | #ifdef CONFIG_AUDIT |
1527 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1528 | current->sessionid != id->sessionid) | |
1529 | return false; | |
1530 | #endif | |
dfead8a8 JA |
1531 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1532 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1533 | if (current->fs != id->fs) |
1534 | return false; | |
1535 | spin_lock(&id->fs->lock); | |
1536 | if (!id->fs->in_exec) { | |
1537 | id->fs->users++; | |
dfead8a8 | 1538 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1539 | } else { |
1540 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1541 | } | |
1542 | spin_unlock(¤t->fs->lock); | |
1543 | } | |
af604703 PB |
1544 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1545 | (def->work_flags & IO_WQ_WORK_FILES) && | |
1546 | !(req->flags & REQ_F_NO_FILE_TABLE)) { | |
1547 | if (id->files != current->files || | |
1548 | id->nsproxy != current->nsproxy) | |
1549 | return false; | |
1550 | atomic_inc(&id->files->count); | |
1551 | get_nsproxy(id->nsproxy); | |
af604703 | 1552 | req->work.flags |= IO_WQ_WORK_FILES; |
ce3d5aae | 1553 | io_req_track_inflight(req); |
af604703 | 1554 | } |
77788775 JA |
1555 | if (!(req->work.flags & IO_WQ_WORK_MM) && |
1556 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1557 | if (id->mm != current->mm) | |
1558 | return false; | |
1559 | mmgrab(id->mm); | |
1560 | req->work.flags |= IO_WQ_WORK_MM; | |
1561 | } | |
1e6fa521 JA |
1562 | |
1563 | return true; | |
1564 | } | |
1565 | ||
1566 | static void io_prep_async_work(struct io_kiocb *req) | |
1567 | { | |
1568 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1569 | struct io_ring_ctx *ctx = req->ctx; |
1570 | ||
1571 | io_req_init_async(req); | |
1572 | ||
feaadc4f PB |
1573 | if (req->flags & REQ_F_FORCE_ASYNC) |
1574 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1575 | ||
1e6fa521 JA |
1576 | if (req->flags & REQ_F_ISREG) { |
1577 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1578 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1579 | } else { | |
1580 | if (def->unbound_nonreg_file) | |
1581 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1582 | } | |
1583 | ||
1e6fa521 JA |
1584 | /* if we fail grabbing identity, we must COW, regrab, and retry */ |
1585 | if (io_grab_identity(req)) | |
1586 | return; | |
1587 | ||
1588 | if (!io_identity_cow(req)) | |
1589 | return; | |
1590 | ||
1591 | /* can't fail at this point */ | |
1592 | if (!io_grab_identity(req)) | |
1593 | WARN_ON(1); | |
561fb04a | 1594 | } |
cccf0ee8 | 1595 | |
cbdcb435 | 1596 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1597 | { |
cbdcb435 | 1598 | struct io_kiocb *cur; |
54a91f3b | 1599 | |
f2f87370 PB |
1600 | io_for_each_link(cur, req) |
1601 | io_prep_async_work(cur); | |
561fb04a JA |
1602 | } |
1603 | ||
7271ef3a | 1604 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1605 | { |
a197f664 | 1606 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1607 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1608 | |
8766dd51 PB |
1609 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1610 | &req->work, req->flags); | |
1611 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1612 | return link; |
18d9be1a JA |
1613 | } |
1614 | ||
cbdcb435 PB |
1615 | static void io_queue_async_work(struct io_kiocb *req) |
1616 | { | |
7271ef3a JA |
1617 | struct io_kiocb *link; |
1618 | ||
cbdcb435 PB |
1619 | /* init ->work of the whole link before punting */ |
1620 | io_prep_async_link(req); | |
7271ef3a JA |
1621 | link = __io_queue_async_work(req); |
1622 | ||
1623 | if (link) | |
1624 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1625 | } |
1626 | ||
5262f567 JA |
1627 | static void io_kill_timeout(struct io_kiocb *req) |
1628 | { | |
e8c2bc1f | 1629 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1630 | int ret; |
1631 | ||
e8c2bc1f | 1632 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1633 | if (ret != -1) { |
01cec8c1 PB |
1634 | atomic_set(&req->ctx->cq_timeouts, |
1635 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1636 | list_del_init(&req->timeout.list); |
78e19bbe | 1637 | io_cqring_fill_event(req, 0); |
216578e5 | 1638 | io_put_req_deferred(req, 1); |
5262f567 JA |
1639 | } |
1640 | } | |
1641 | ||
76e1b642 JA |
1642 | /* |
1643 | * Returns true if we found and killed one or more timeouts | |
1644 | */ | |
6b81928d PB |
1645 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1646 | struct files_struct *files) | |
5262f567 JA |
1647 | { |
1648 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1649 | int canceled = 0; |
5262f567 JA |
1650 | |
1651 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1652 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1653 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1654 | io_kill_timeout(req); |
76e1b642 JA |
1655 | canceled++; |
1656 | } | |
f3606e3a | 1657 | } |
5262f567 | 1658 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1659 | return canceled != 0; |
5262f567 JA |
1660 | } |
1661 | ||
04518945 | 1662 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1663 | { |
04518945 | 1664 | do { |
27dc8338 PB |
1665 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1666 | struct io_defer_entry, list); | |
de0617e4 | 1667 | |
9cf7c104 | 1668 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1669 | break; |
27dc8338 | 1670 | list_del_init(&de->list); |
907d1df3 | 1671 | io_req_task_queue(de->req); |
27dc8338 | 1672 | kfree(de); |
04518945 PB |
1673 | } while (!list_empty(&ctx->defer_list)); |
1674 | } | |
1675 | ||
360428f8 | 1676 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1677 | { |
f010505b MDG |
1678 | u32 seq; |
1679 | ||
1680 | if (list_empty(&ctx->timeout_list)) | |
1681 | return; | |
1682 | ||
1683 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
1684 | ||
1685 | do { | |
1686 | u32 events_needed, events_got; | |
360428f8 | 1687 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1688 | struct io_kiocb, timeout.list); |
de0617e4 | 1689 | |
8eb7e2d0 | 1690 | if (io_is_timeout_noseq(req)) |
360428f8 | 1691 | break; |
f010505b MDG |
1692 | |
1693 | /* | |
1694 | * Since seq can easily wrap around over time, subtract | |
1695 | * the last seq at which timeouts were flushed before comparing. | |
1696 | * Assuming not more than 2^31-1 events have happened since, | |
1697 | * these subtractions won't have wrapped, so we can check if | |
1698 | * target is in [last_seq, current_seq] by comparing the two. | |
1699 | */ | |
1700 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1701 | events_got = seq - ctx->cq_last_tm_flush; | |
1702 | if (events_got < events_needed) | |
360428f8 | 1703 | break; |
bfe68a22 | 1704 | |
135fcde8 | 1705 | list_del_init(&req->timeout.list); |
5262f567 | 1706 | io_kill_timeout(req); |
f010505b MDG |
1707 | } while (!list_empty(&ctx->timeout_list)); |
1708 | ||
1709 | ctx->cq_last_tm_flush = seq; | |
360428f8 | 1710 | } |
5262f567 | 1711 | |
360428f8 PB |
1712 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1713 | { | |
1714 | io_flush_timeouts(ctx); | |
ec30e04b PB |
1715 | |
1716 | /* order cqe stores with ring update */ | |
1717 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 | 1718 | |
04518945 PB |
1719 | if (unlikely(!list_empty(&ctx->defer_list))) |
1720 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1721 | } |
1722 | ||
90554200 JA |
1723 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1724 | { | |
1725 | struct io_rings *r = ctx->rings; | |
1726 | ||
1727 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1728 | } | |
1729 | ||
888aae2e PB |
1730 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1731 | { | |
1732 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1733 | } | |
1734 | ||
2b188cc1 JA |
1735 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1736 | { | |
75b28aff | 1737 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1738 | unsigned tail; |
1739 | ||
115e12e5 SB |
1740 | /* |
1741 | * writes to the cq entry need to come after reading head; the | |
1742 | * control dependency is enough as we're using WRITE_ONCE to | |
1743 | * fill the cq entry | |
1744 | */ | |
888aae2e | 1745 | if (__io_cqring_events(ctx) == rings->cq_ring_entries) |
2b188cc1 JA |
1746 | return NULL; |
1747 | ||
888aae2e | 1748 | tail = ctx->cached_cq_tail++; |
75b28aff | 1749 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1750 | } |
1751 | ||
f2842ab5 JA |
1752 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1753 | { | |
f0b493e6 JA |
1754 | if (!ctx->cq_ev_fd) |
1755 | return false; | |
7e55a19c SG |
1756 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1757 | return false; | |
f2842ab5 JA |
1758 | if (!ctx->eventfd_async) |
1759 | return true; | |
b41e9852 | 1760 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1761 | } |
1762 | ||
b41e9852 | 1763 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1764 | { |
b1445e59 PB |
1765 | /* see waitqueue_active() comment */ |
1766 | smp_mb(); | |
1767 | ||
1d7bb1d5 JA |
1768 | if (waitqueue_active(&ctx->wait)) |
1769 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1770 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1771 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1772 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1773 | eventfd_signal(ctx->cq_ev_fd, 1); |
b1445e59 | 1774 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1775 | wake_up_interruptible(&ctx->cq_wait); |
1776 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1777 | } | |
1d7bb1d5 JA |
1778 | } |
1779 | ||
80c18e4a PB |
1780 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1781 | { | |
b1445e59 PB |
1782 | /* see waitqueue_active() comment */ |
1783 | smp_mb(); | |
1784 | ||
80c18e4a PB |
1785 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1786 | if (waitqueue_active(&ctx->wait)) | |
1787 | wake_up(&ctx->wait); | |
1788 | } | |
1789 | if (io_should_trigger_evfd(ctx)) | |
1790 | eventfd_signal(ctx->cq_ev_fd, 1); | |
b1445e59 | 1791 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1792 | wake_up_interruptible(&ctx->cq_wait); |
1793 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1794 | } | |
80c18e4a PB |
1795 | } |
1796 | ||
c4a2ed72 | 1797 | /* Returns true if there are no backlogged entries after the flush */ |
6c503150 PB |
1798 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1799 | struct task_struct *tsk, | |
1800 | struct files_struct *files) | |
1d7bb1d5 JA |
1801 | { |
1802 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1803 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1804 | struct io_uring_cqe *cqe; |
1d7bb1d5 | 1805 | unsigned long flags; |
b18032bb | 1806 | bool all_flushed, posted; |
1d7bb1d5 JA |
1807 | LIST_HEAD(list); |
1808 | ||
e23de15f PB |
1809 | if (!force && __io_cqring_events(ctx) == rings->cq_ring_entries) |
1810 | return false; | |
1d7bb1d5 | 1811 | |
b18032bb | 1812 | posted = false; |
1d7bb1d5 | 1813 | spin_lock_irqsave(&ctx->completion_lock, flags); |
e6c8aa9a | 1814 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1815 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1816 | continue; |
1817 | ||
1d7bb1d5 JA |
1818 | cqe = io_get_cqring(ctx); |
1819 | if (!cqe && !force) | |
1820 | break; | |
1821 | ||
40d8ddd4 | 1822 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1823 | if (cqe) { |
1824 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1825 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1826 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1827 | } else { |
2c3bac6d | 1828 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1829 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1830 | ctx->cached_cq_overflow); |
1d7bb1d5 | 1831 | } |
b18032bb | 1832 | posted = true; |
1d7bb1d5 JA |
1833 | } |
1834 | ||
09e88404 PB |
1835 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1836 | if (all_flushed) { | |
1837 | clear_bit(0, &ctx->sq_check_overflow); | |
1838 | clear_bit(0, &ctx->cq_check_overflow); | |
1839 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1840 | } | |
46930143 | 1841 | |
b18032bb JA |
1842 | if (posted) |
1843 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1844 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1845 | if (posted) |
1846 | io_cqring_ev_posted(ctx); | |
1d7bb1d5 JA |
1847 | |
1848 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1849 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1850 | list_del(&req->compl.list); | |
ec9c02ad | 1851 | io_put_req(req); |
1d7bb1d5 | 1852 | } |
c4a2ed72 | 1853 | |
09e88404 | 1854 | return all_flushed; |
1d7bb1d5 JA |
1855 | } |
1856 | ||
6c503150 PB |
1857 | static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1858 | struct task_struct *tsk, | |
1859 | struct files_struct *files) | |
1860 | { | |
1861 | if (test_bit(0, &ctx->cq_check_overflow)) { | |
1862 | /* iopoll syncs against uring_lock, not completion_lock */ | |
1863 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1864 | mutex_lock(&ctx->uring_lock); | |
1865 | __io_cqring_overflow_flush(ctx, force, tsk, files); | |
1866 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1867 | mutex_unlock(&ctx->uring_lock); | |
1868 | } | |
1869 | } | |
1870 | ||
bcda7baa | 1871 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1872 | { |
78e19bbe | 1873 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1874 | struct io_uring_cqe *cqe; |
1875 | ||
78e19bbe | 1876 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1877 | |
2b188cc1 JA |
1878 | /* |
1879 | * If we can't get a cq entry, userspace overflowed the | |
1880 | * submission (by quite a lot). Increment the overflow count in | |
1881 | * the ring. | |
1882 | */ | |
1883 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1884 | if (likely(cqe)) { |
78e19bbe | 1885 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1886 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1887 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1888 | } else if (ctx->cq_overflow_flushed || |
1889 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1890 | /* |
1891 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1892 | * then we cannot store the request for later flushing, we need | |
1893 | * to drop it on the floor. | |
1894 | */ | |
2c3bac6d PB |
1895 | ctx->cached_cq_overflow++; |
1896 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1897 | } else { |
ad3eb2c8 JA |
1898 | if (list_empty(&ctx->cq_overflow_list)) { |
1899 | set_bit(0, &ctx->sq_check_overflow); | |
1900 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1901 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1902 | } |
40d8ddd4 | 1903 | io_clean_op(req); |
1d7bb1d5 | 1904 | req->result = res; |
0f7e466b | 1905 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1906 | refcount_inc(&req->refs); |
1907 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1908 | } |
1909 | } | |
1910 | ||
bcda7baa JA |
1911 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1912 | { | |
1913 | __io_cqring_fill_event(req, res, 0); | |
1914 | } | |
1915 | ||
c7dae4ba JA |
1916 | static inline void io_req_complete_post(struct io_kiocb *req, long res, |
1917 | unsigned int cflags) | |
2b188cc1 | 1918 | { |
78e19bbe | 1919 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1920 | unsigned long flags; |
1921 | ||
1922 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1923 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 | 1924 | io_commit_cqring(ctx); |
c7dae4ba JA |
1925 | /* |
1926 | * If we're the last reference to this request, add to our locked | |
1927 | * free_list cache. | |
1928 | */ | |
1929 | if (refcount_dec_and_test(&req->refs)) { | |
1930 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
1931 | ||
1932 | io_dismantle_req(req); | |
1933 | io_put_task(req->task, 1); | |
1934 | list_add(&req->compl.list, &cs->locked_free_list); | |
1935 | cs->locked_free_nr++; | |
1936 | } else | |
1937 | req = NULL; | |
2b188cc1 JA |
1938 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1939 | ||
8c838788 | 1940 | io_cqring_ev_posted(ctx); |
c7dae4ba JA |
1941 | if (req) { |
1942 | io_queue_next(req); | |
1943 | percpu_ref_put(&ctx->refs); | |
1944 | } | |
2b188cc1 JA |
1945 | } |
1946 | ||
a38d68db | 1947 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1948 | unsigned int cflags) |
229a7b63 | 1949 | { |
a38d68db PB |
1950 | io_clean_op(req); |
1951 | req->result = res; | |
1952 | req->compl.cflags = cflags; | |
e342c807 | 1953 | req->flags |= REQ_F_COMPLETE_INLINE; |
a38d68db PB |
1954 | } |
1955 | ||
889fca73 PB |
1956 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1957 | long res, unsigned cflags) | |
a38d68db | 1958 | { |
889fca73 PB |
1959 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1960 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1961 | else |
c7dae4ba | 1962 | io_req_complete_post(req, res, cflags); |
e1e16097 JA |
1963 | } |
1964 | ||
a38d68db | 1965 | static inline void io_req_complete(struct io_kiocb *req, long res) |
bcda7baa | 1966 | { |
889fca73 | 1967 | __io_req_complete(req, 0, res, 0); |
bcda7baa JA |
1968 | } |
1969 | ||
c7dae4ba | 1970 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
2b188cc1 | 1971 | { |
c7dae4ba JA |
1972 | struct io_submit_state *state = &ctx->submit_state; |
1973 | struct io_comp_state *cs = &state->comp; | |
e5d1bc0a | 1974 | struct io_kiocb *req = NULL; |
1b4c351f | 1975 | |
c7dae4ba JA |
1976 | /* |
1977 | * If we have more than a batch's worth of requests in our IRQ side | |
1978 | * locked cache, grab the lock and move them over to our submission | |
1979 | * side cache. | |
1980 | */ | |
1981 | if (READ_ONCE(cs->locked_free_nr) > IO_COMPL_BATCH) { | |
1982 | spin_lock_irq(&ctx->completion_lock); | |
1983 | list_splice_init(&cs->locked_free_list, &cs->free_list); | |
1984 | cs->locked_free_nr = 0; | |
1985 | spin_unlock_irq(&ctx->completion_lock); | |
1986 | } | |
1987 | ||
1988 | while (!list_empty(&cs->free_list)) { | |
1989 | req = list_first_entry(&cs->free_list, struct io_kiocb, | |
1b4c351f JA |
1990 | compl.list); |
1991 | list_del(&req->compl.list); | |
e5d1bc0a PB |
1992 | state->reqs[state->free_reqs++] = req; |
1993 | if (state->free_reqs == ARRAY_SIZE(state->reqs)) | |
1994 | break; | |
1b4c351f JA |
1995 | } |
1996 | ||
e5d1bc0a PB |
1997 | return req != NULL; |
1998 | } | |
1999 | ||
2000 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2001 | { | |
2002 | struct io_submit_state *state = &ctx->submit_state; | |
2003 | ||
2004 | BUILD_BUG_ON(IO_REQ_ALLOC_BATCH > ARRAY_SIZE(state->reqs)); | |
2005 | ||
f6b6c7d6 | 2006 | if (!state->free_reqs) { |
291b2821 | 2007 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
2008 | int ret; |
2009 | ||
c7dae4ba | 2010 | if (io_flush_cached_reqs(ctx)) |
e5d1bc0a PB |
2011 | goto got_req; |
2012 | ||
bf019da7 PB |
2013 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
2014 | state->reqs); | |
fd6fab2c JA |
2015 | |
2016 | /* | |
2017 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2018 | * retry single alloc to be on the safe side. | |
2019 | */ | |
2020 | if (unlikely(ret <= 0)) { | |
2021 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
2022 | if (!state->reqs[0]) | |
3893f39f | 2023 | return NULL; |
fd6fab2c JA |
2024 | ret = 1; |
2025 | } | |
291b2821 | 2026 | state->free_reqs = ret; |
2b188cc1 | 2027 | } |
e5d1bc0a | 2028 | got_req: |
291b2821 PB |
2029 | state->free_reqs--; |
2030 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
2031 | } |
2032 | ||
8da11c19 PB |
2033 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
2034 | bool fixed) | |
2035 | { | |
36f72fe2 | 2036 | if (!fixed) |
8da11c19 PB |
2037 | fput(file); |
2038 | } | |
2039 | ||
4edf20f9 | 2040 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2041 | { |
3ca405eb | 2042 | io_clean_op(req); |
929a3af9 | 2043 | |
e8c2bc1f JA |
2044 | if (req->async_data) |
2045 | kfree(req->async_data); | |
8da11c19 PB |
2046 | if (req->file) |
2047 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
269bbe5f BM |
2048 | if (req->fixed_rsrc_refs) |
2049 | percpu_ref_put(req->fixed_rsrc_refs); | |
4edf20f9 | 2050 | io_req_clean_work(req); |
e65ef56d JA |
2051 | } |
2052 | ||
7c660731 PB |
2053 | static inline void io_put_task(struct task_struct *task, int nr) |
2054 | { | |
2055 | struct io_uring_task *tctx = task->io_uring; | |
2056 | ||
2057 | percpu_counter_sub(&tctx->inflight, nr); | |
2058 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2059 | wake_up(&tctx->wait); | |
2060 | put_task_struct_many(task, nr); | |
2061 | } | |
2062 | ||
216578e5 | 2063 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2064 | { |
51a4cc11 | 2065 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2066 | |
216578e5 | 2067 | io_dismantle_req(req); |
7c660731 | 2068 | io_put_task(req->task, 1); |
e3bc8e9d | 2069 | |
3893f39f | 2070 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 2071 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
2072 | } |
2073 | ||
f2f87370 PB |
2074 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2075 | { | |
2076 | struct io_kiocb *nxt = req->link; | |
2077 | ||
2078 | req->link = nxt->link; | |
2079 | nxt->link = NULL; | |
2080 | } | |
2081 | ||
c9abd7ad | 2082 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 2083 | { |
a197f664 | 2084 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 2085 | struct io_kiocb *link; |
c9abd7ad PB |
2086 | bool cancelled = false; |
2087 | unsigned long flags; | |
7c86ffee | 2088 | |
c9abd7ad | 2089 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2090 | link = req->link; |
2091 | ||
900fad45 PB |
2092 | /* |
2093 | * Can happen if a linked timeout fired and link had been like | |
2094 | * req -> link t-out -> link t-out [-> ...] | |
2095 | */ | |
c9abd7ad PB |
2096 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
2097 | struct io_timeout_data *io = link->async_data; | |
2098 | int ret; | |
7c86ffee | 2099 | |
f2f87370 | 2100 | io_remove_next_linked(req); |
90cd7e42 | 2101 | link->timeout.head = NULL; |
c9abd7ad PB |
2102 | ret = hrtimer_try_to_cancel(&io->timer); |
2103 | if (ret != -1) { | |
2104 | io_cqring_fill_event(link, -ECANCELED); | |
2105 | io_commit_cqring(ctx); | |
2106 | cancelled = true; | |
2107 | } | |
2108 | } | |
7c86ffee | 2109 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 2110 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 2111 | |
c9abd7ad | 2112 | if (cancelled) { |
7c86ffee | 2113 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2114 | io_put_req(link); |
2115 | } | |
7c86ffee PB |
2116 | } |
2117 | ||
9e645e11 | 2118 | |
d148ca4b | 2119 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2120 | { |
f2f87370 | 2121 | struct io_kiocb *link, *nxt; |
2665abfd | 2122 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2123 | unsigned long flags; |
9e645e11 | 2124 | |
d148ca4b | 2125 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2126 | link = req->link; |
2127 | req->link = NULL; | |
9e645e11 | 2128 | |
f2f87370 PB |
2129 | while (link) { |
2130 | nxt = link->link; | |
2131 | link->link = NULL; | |
2665abfd | 2132 | |
f2f87370 | 2133 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2134 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2135 | |
2136 | /* | |
2137 | * It's ok to free under spinlock as they're not linked anymore, | |
2138 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2139 | * work.fs->lock. | |
2140 | */ | |
2141 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2142 | io_put_req_deferred(link, 2); | |
2143 | else | |
2144 | io_double_put_req(link); | |
f2f87370 | 2145 | link = nxt; |
9e645e11 | 2146 | } |
2665abfd | 2147 | io_commit_cqring(ctx); |
216578e5 | 2148 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2149 | |
2665abfd | 2150 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2151 | } |
2152 | ||
3fa5e0f3 | 2153 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2154 | { |
7c86ffee PB |
2155 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2156 | io_kill_linked_timeout(req); | |
944e58bf | 2157 | |
9e645e11 JA |
2158 | /* |
2159 | * If LINK is set, we have dependent requests in this chain. If we | |
2160 | * didn't fail this request, queue the first one up, moving any other | |
2161 | * dependencies to the next request. In case of failure, fail the rest | |
2162 | * of the chain. | |
2163 | */ | |
f2f87370 PB |
2164 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2165 | struct io_kiocb *nxt = req->link; | |
2166 | ||
2167 | req->link = NULL; | |
2168 | return nxt; | |
2169 | } | |
9b5f7bd9 PB |
2170 | io_fail_links(req); |
2171 | return NULL; | |
4d7dd462 | 2172 | } |
9e645e11 | 2173 | |
f2f87370 | 2174 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2175 | { |
f2f87370 | 2176 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2177 | return NULL; |
2178 | return __io_req_find_next(req); | |
2179 | } | |
2180 | ||
7cbf1722 JA |
2181 | static bool __tctx_task_work(struct io_uring_task *tctx) |
2182 | { | |
65453d1e | 2183 | struct io_ring_ctx *ctx = NULL; |
7cbf1722 JA |
2184 | struct io_wq_work_list list; |
2185 | struct io_wq_work_node *node; | |
2186 | ||
2187 | if (wq_list_empty(&tctx->task_list)) | |
2188 | return false; | |
2189 | ||
2190 | spin_lock(&tctx->task_lock); | |
2191 | list = tctx->task_list; | |
2192 | INIT_WQ_LIST(&tctx->task_list); | |
2193 | spin_unlock(&tctx->task_lock); | |
2194 | ||
2195 | node = list.first; | |
2196 | while (node) { | |
2197 | struct io_wq_work_node *next = node->next; | |
65453d1e | 2198 | struct io_ring_ctx *this_ctx; |
7cbf1722 JA |
2199 | struct io_kiocb *req; |
2200 | ||
2201 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
65453d1e | 2202 | this_ctx = req->ctx; |
7cbf1722 JA |
2203 | req->task_work.func(&req->task_work); |
2204 | node = next; | |
65453d1e JA |
2205 | |
2206 | if (!ctx) { | |
2207 | ctx = this_ctx; | |
2208 | } else if (ctx != this_ctx) { | |
2209 | mutex_lock(&ctx->uring_lock); | |
2210 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2211 | mutex_unlock(&ctx->uring_lock); | |
2212 | ctx = this_ctx; | |
2213 | } | |
2214 | } | |
2215 | ||
2216 | if (ctx && ctx->submit_state.comp.nr) { | |
2217 | mutex_lock(&ctx->uring_lock); | |
2218 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2219 | mutex_unlock(&ctx->uring_lock); | |
7cbf1722 JA |
2220 | } |
2221 | ||
2222 | return list.first != NULL; | |
2223 | } | |
2224 | ||
2225 | static void tctx_task_work(struct callback_head *cb) | |
2226 | { | |
2227 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, task_work); | |
2228 | ||
2229 | while (__tctx_task_work(tctx)) | |
2230 | cond_resched(); | |
2231 | ||
2232 | clear_bit(0, &tctx->task_state); | |
2233 | } | |
2234 | ||
2235 | static int io_task_work_add(struct task_struct *tsk, struct io_kiocb *req, | |
2236 | enum task_work_notify_mode notify) | |
2237 | { | |
2238 | struct io_uring_task *tctx = tsk->io_uring; | |
2239 | struct io_wq_work_node *node, *prev; | |
2240 | int ret; | |
2241 | ||
2242 | WARN_ON_ONCE(!tctx); | |
2243 | ||
2244 | spin_lock(&tctx->task_lock); | |
2245 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
2246 | spin_unlock(&tctx->task_lock); | |
2247 | ||
2248 | /* task_work already pending, we're done */ | |
2249 | if (test_bit(0, &tctx->task_state) || | |
2250 | test_and_set_bit(0, &tctx->task_state)) | |
2251 | return 0; | |
2252 | ||
2253 | if (!task_work_add(tsk, &tctx->task_work, notify)) | |
2254 | return 0; | |
2255 | ||
2256 | /* | |
2257 | * Slow path - we failed, find and delete work. if the work is not | |
2258 | * in the list, it got run and we're fine. | |
2259 | */ | |
2260 | ret = 0; | |
2261 | spin_lock(&tctx->task_lock); | |
2262 | wq_list_for_each(node, prev, &tctx->task_list) { | |
2263 | if (&req->io_task_work.node == node) { | |
2264 | wq_list_del(&tctx->task_list, node, prev); | |
2265 | ret = 1; | |
2266 | break; | |
2267 | } | |
2268 | } | |
2269 | spin_unlock(&tctx->task_lock); | |
2270 | clear_bit(0, &tctx->task_state); | |
2271 | return ret; | |
2272 | } | |
2273 | ||
355fb9e2 | 2274 | static int io_req_task_work_add(struct io_kiocb *req) |
c2c4c83c JA |
2275 | { |
2276 | struct task_struct *tsk = req->task; | |
2277 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2278 | enum task_work_notify_mode notify; |
2279 | int ret; | |
c2c4c83c | 2280 | |
6200b0ae JA |
2281 | if (tsk->flags & PF_EXITING) |
2282 | return -ESRCH; | |
2283 | ||
c2c4c83c | 2284 | /* |
0ba9c9ed JA |
2285 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2286 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2287 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2288 | * will do the job. | |
c2c4c83c | 2289 | */ |
91989c70 | 2290 | notify = TWA_NONE; |
355fb9e2 | 2291 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) |
c2c4c83c JA |
2292 | notify = TWA_SIGNAL; |
2293 | ||
7cbf1722 | 2294 | ret = io_task_work_add(tsk, req, notify); |
c2c4c83c JA |
2295 | if (!ret) |
2296 | wake_up_process(tsk); | |
0ba9c9ed | 2297 | |
c2c4c83c JA |
2298 | return ret; |
2299 | } | |
2300 | ||
eab30c4d | 2301 | static void io_req_task_work_add_fallback(struct io_kiocb *req, |
7cbf1722 | 2302 | task_work_func_t cb) |
eab30c4d PB |
2303 | { |
2304 | struct task_struct *tsk = io_wq_get_task(req->ctx->io_wq); | |
2305 | ||
2306 | init_task_work(&req->task_work, cb); | |
2307 | task_work_add(tsk, &req->task_work, TWA_NONE); | |
2308 | wake_up_process(tsk); | |
2309 | } | |
2310 | ||
c40f6379 JA |
2311 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2312 | { | |
2313 | struct io_ring_ctx *ctx = req->ctx; | |
2314 | ||
2315 | spin_lock_irq(&ctx->completion_lock); | |
2316 | io_cqring_fill_event(req, error); | |
2317 | io_commit_cqring(ctx); | |
2318 | spin_unlock_irq(&ctx->completion_lock); | |
2319 | ||
2320 | io_cqring_ev_posted(ctx); | |
2321 | req_set_fail_links(req); | |
2322 | io_double_put_req(req); | |
2323 | } | |
2324 | ||
2325 | static void io_req_task_cancel(struct callback_head *cb) | |
2326 | { | |
2327 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2328 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2329 | |
2330 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2331 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2332 | } |
2333 | ||
2334 | static void __io_req_task_submit(struct io_kiocb *req) | |
2335 | { | |
2336 | struct io_ring_ctx *ctx = req->ctx; | |
2337 | ||
81b6d05c | 2338 | mutex_lock(&ctx->uring_lock); |
d9d05217 PB |
2339 | if (!ctx->sqo_dead && |
2340 | !__io_sq_thread_acquire_mm(ctx) && | |
2341 | !__io_sq_thread_acquire_files(ctx)) | |
c5eef2b9 | 2342 | __io_queue_sqe(req); |
81b6d05c | 2343 | else |
c40f6379 | 2344 | __io_req_task_cancel(req, -EFAULT); |
81b6d05c | 2345 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2346 | } |
2347 | ||
2348 | static void io_req_task_submit(struct callback_head *cb) | |
2349 | { | |
2350 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2351 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2352 | |
2353 | __io_req_task_submit(req); | |
6d816e08 | 2354 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2355 | } |
2356 | ||
2357 | static void io_req_task_queue(struct io_kiocb *req) | |
2358 | { | |
c40f6379 JA |
2359 | int ret; |
2360 | ||
7cbf1722 | 2361 | req->task_work.func = io_req_task_submit; |
6d816e08 | 2362 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2363 | |
355fb9e2 | 2364 | ret = io_req_task_work_add(req); |
eab30c4d PB |
2365 | if (unlikely(ret)) |
2366 | io_req_task_work_add_fallback(req, io_req_task_cancel); | |
c40f6379 JA |
2367 | } |
2368 | ||
f2f87370 | 2369 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2370 | { |
9b5f7bd9 | 2371 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2372 | |
2373 | if (nxt) | |
906a8c3f | 2374 | io_req_task_queue(nxt); |
c69f8dbe JL |
2375 | } |
2376 | ||
c3524383 | 2377 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2378 | { |
c3524383 PB |
2379 | io_queue_next(req); |
2380 | __io_free_req(req); | |
2381 | } | |
8766dd51 | 2382 | |
2d6500d4 | 2383 | struct req_batch { |
5af1d13e PB |
2384 | struct task_struct *task; |
2385 | int task_refs; | |
1b4c351f | 2386 | int ctx_refs; |
2d6500d4 PB |
2387 | }; |
2388 | ||
5af1d13e PB |
2389 | static inline void io_init_req_batch(struct req_batch *rb) |
2390 | { | |
5af1d13e | 2391 | rb->task_refs = 0; |
9ae72463 | 2392 | rb->ctx_refs = 0; |
5af1d13e PB |
2393 | rb->task = NULL; |
2394 | } | |
2395 | ||
2d6500d4 PB |
2396 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2397 | struct req_batch *rb) | |
2398 | { | |
6e833d53 | 2399 | if (rb->task) |
7c660731 | 2400 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2401 | if (rb->ctx_refs) |
2402 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2403 | } |
2404 | ||
6ff119a6 PB |
2405 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2406 | struct io_submit_state *state) | |
2d6500d4 | 2407 | { |
f2f87370 | 2408 | io_queue_next(req); |
2d6500d4 | 2409 | |
e3bc8e9d | 2410 | if (req->task != rb->task) { |
7c660731 PB |
2411 | if (rb->task) |
2412 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2413 | rb->task = req->task; |
2414 | rb->task_refs = 0; | |
5af1d13e | 2415 | } |
e3bc8e9d | 2416 | rb->task_refs++; |
9ae72463 | 2417 | rb->ctx_refs++; |
5af1d13e | 2418 | |
4edf20f9 | 2419 | io_dismantle_req(req); |
6ff119a6 PB |
2420 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) { |
2421 | state->reqs[state->free_reqs++] = req; | |
2422 | } else { | |
1b4c351f JA |
2423 | struct io_comp_state *cs = &req->ctx->submit_state.comp; |
2424 | ||
2425 | list_add(&req->compl.list, &cs->free_list); | |
6ff119a6 | 2426 | } |
7a743e22 PB |
2427 | } |
2428 | ||
905c172f PB |
2429 | static void io_submit_flush_completions(struct io_comp_state *cs, |
2430 | struct io_ring_ctx *ctx) | |
2431 | { | |
2432 | int i, nr = cs->nr; | |
2433 | struct io_kiocb *req; | |
2434 | struct req_batch rb; | |
2435 | ||
2436 | io_init_req_batch(&rb); | |
2437 | spin_lock_irq(&ctx->completion_lock); | |
2438 | for (i = 0; i < nr; i++) { | |
2439 | req = cs->reqs[i]; | |
2440 | __io_cqring_fill_event(req, req->result, req->compl.cflags); | |
2441 | } | |
2442 | io_commit_cqring(ctx); | |
2443 | spin_unlock_irq(&ctx->completion_lock); | |
2444 | ||
2445 | io_cqring_ev_posted(ctx); | |
2446 | for (i = 0; i < nr; i++) { | |
2447 | req = cs->reqs[i]; | |
2448 | ||
2449 | /* submission and completion refs */ | |
2450 | if (refcount_sub_and_test(2, &req->refs)) | |
6ff119a6 | 2451 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2452 | } |
2453 | ||
2454 | io_req_free_batch_finish(ctx, &rb); | |
2455 | cs->nr = 0; | |
2456 | } | |
2457 | ||
ba816ad6 JA |
2458 | /* |
2459 | * Drop reference to request, return next in chain (if there is one) if this | |
2460 | * was the last reference to this request. | |
2461 | */ | |
9b5f7bd9 | 2462 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2463 | { |
9b5f7bd9 PB |
2464 | struct io_kiocb *nxt = NULL; |
2465 | ||
2a44f467 | 2466 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2467 | nxt = io_req_find_next(req); |
4d7dd462 | 2468 | __io_free_req(req); |
2a44f467 | 2469 | } |
9b5f7bd9 | 2470 | return nxt; |
2b188cc1 JA |
2471 | } |
2472 | ||
e65ef56d JA |
2473 | static void io_put_req(struct io_kiocb *req) |
2474 | { | |
2475 | if (refcount_dec_and_test(&req->refs)) | |
2476 | io_free_req(req); | |
2b188cc1 JA |
2477 | } |
2478 | ||
216578e5 PB |
2479 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2480 | { | |
2481 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2482 | ||
2483 | io_free_req(req); | |
2484 | } | |
2485 | ||
2486 | static void io_free_req_deferred(struct io_kiocb *req) | |
2487 | { | |
2488 | int ret; | |
2489 | ||
7cbf1722 | 2490 | req->task_work.func = io_put_req_deferred_cb; |
355fb9e2 | 2491 | ret = io_req_task_work_add(req); |
eab30c4d PB |
2492 | if (unlikely(ret)) |
2493 | io_req_task_work_add_fallback(req, io_put_req_deferred_cb); | |
216578e5 PB |
2494 | } |
2495 | ||
2496 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2497 | { | |
2498 | if (refcount_sub_and_test(refs, &req->refs)) | |
2499 | io_free_req_deferred(req); | |
2500 | } | |
2501 | ||
978db57e JA |
2502 | static void io_double_put_req(struct io_kiocb *req) |
2503 | { | |
2504 | /* drop both submit and complete references */ | |
2505 | if (refcount_sub_and_test(2, &req->refs)) | |
2506 | io_free_req(req); | |
2507 | } | |
2508 | ||
6c503150 | 2509 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2510 | { |
2511 | /* See comment at the top of this file */ | |
2512 | smp_rmb(); | |
e23de15f | 2513 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2514 | } |
2515 | ||
fb5ccc98 PB |
2516 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2517 | { | |
2518 | struct io_rings *rings = ctx->rings; | |
2519 | ||
2520 | /* make sure SQ entry isn't read before tail */ | |
2521 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2522 | } | |
2523 | ||
8ff069bf | 2524 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2525 | { |
8ff069bf | 2526 | unsigned int cflags; |
e94f141b | 2527 | |
bcda7baa JA |
2528 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2529 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2530 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2531 | kfree(kbuf); |
2532 | return cflags; | |
e94f141b JA |
2533 | } |
2534 | ||
8ff069bf | 2535 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2536 | { |
4d954c25 | 2537 | struct io_buffer *kbuf; |
bcda7baa | 2538 | |
4d954c25 | 2539 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2540 | return io_put_kbuf(req, kbuf); |
2541 | } | |
2542 | ||
4c6e277c JA |
2543 | static inline bool io_run_task_work(void) |
2544 | { | |
6200b0ae JA |
2545 | /* |
2546 | * Not safe to run on exiting task, and the task_work handling will | |
2547 | * not add work to such a task. | |
2548 | */ | |
2549 | if (unlikely(current->flags & PF_EXITING)) | |
2550 | return false; | |
4c6e277c JA |
2551 | if (current->task_works) { |
2552 | __set_current_state(TASK_RUNNING); | |
2553 | task_work_run(); | |
2554 | return true; | |
2555 | } | |
2556 | ||
2557 | return false; | |
bcda7baa JA |
2558 | } |
2559 | ||
def596e9 JA |
2560 | /* |
2561 | * Find and free completed poll iocbs | |
2562 | */ | |
2563 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2564 | struct list_head *done) | |
2565 | { | |
8237e045 | 2566 | struct req_batch rb; |
def596e9 | 2567 | struct io_kiocb *req; |
bbde017a XW |
2568 | |
2569 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2570 | smp_rmb(); | |
def596e9 | 2571 | |
5af1d13e | 2572 | io_init_req_batch(&rb); |
def596e9 | 2573 | while (!list_empty(done)) { |
bcda7baa JA |
2574 | int cflags = 0; |
2575 | ||
d21ffe7e | 2576 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2577 | list_del(&req->inflight_entry); |
2578 | ||
bbde017a XW |
2579 | if (READ_ONCE(req->result) == -EAGAIN) { |
2580 | req->iopoll_completed = 0; | |
f161340d PB |
2581 | if (io_rw_reissue(req, -EAGAIN)) |
2582 | continue; | |
bbde017a | 2583 | } |
def596e9 | 2584 | |
bcda7baa | 2585 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2586 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2587 | |
2588 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2589 | (*nr_events)++; |
2590 | ||
c3524383 | 2591 | if (refcount_dec_and_test(&req->refs)) |
6ff119a6 | 2592 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2593 | } |
def596e9 | 2594 | |
09bb8394 | 2595 | io_commit_cqring(ctx); |
80c18e4a | 2596 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2597 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2598 | } |
2599 | ||
def596e9 JA |
2600 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2601 | long min) | |
2602 | { | |
2603 | struct io_kiocb *req, *tmp; | |
2604 | LIST_HEAD(done); | |
2605 | bool spin; | |
2606 | int ret; | |
2607 | ||
2608 | /* | |
2609 | * Only spin for completions if we don't have multiple devices hanging | |
2610 | * off our complete list, and we're under the requested amount. | |
2611 | */ | |
2612 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2613 | ||
2614 | ret = 0; | |
d21ffe7e | 2615 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2616 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2617 | |
2618 | /* | |
581f9810 BM |
2619 | * Move completed and retryable entries to our local lists. |
2620 | * If we find a request that requires polling, break out | |
2621 | * and complete those lists first, if we have entries there. | |
def596e9 | 2622 | */ |
65a6543d | 2623 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2624 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2625 | continue; |
2626 | } | |
2627 | if (!list_empty(&done)) | |
2628 | break; | |
2629 | ||
2630 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2631 | if (ret < 0) | |
2632 | break; | |
2633 | ||
3aadc23e PB |
2634 | /* iopoll may have completed current req */ |
2635 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2636 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2637 | |
def596e9 JA |
2638 | if (ret && spin) |
2639 | spin = false; | |
2640 | ret = 0; | |
2641 | } | |
2642 | ||
2643 | if (!list_empty(&done)) | |
2644 | io_iopoll_complete(ctx, nr_events, &done); | |
2645 | ||
2646 | return ret; | |
2647 | } | |
2648 | ||
2649 | /* | |
d195a66e | 2650 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2651 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2652 | * as a non-spinning completion check. | |
2653 | */ | |
2654 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2655 | long min) | |
2656 | { | |
540e32a0 | 2657 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2658 | int ret; |
2659 | ||
2660 | ret = io_do_iopoll(ctx, nr_events, min); | |
2661 | if (ret < 0) | |
2662 | return ret; | |
eba0a4dd | 2663 | if (*nr_events >= min) |
def596e9 JA |
2664 | return 0; |
2665 | } | |
2666 | ||
2667 | return 1; | |
2668 | } | |
2669 | ||
2670 | /* | |
2671 | * We can't just wait for polled events to come to us, we have to actively | |
2672 | * find and complete them. | |
2673 | */ | |
b2edc0a7 | 2674 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2675 | { |
2676 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2677 | return; | |
2678 | ||
2679 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2680 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2681 | unsigned int nr_events = 0; |
2682 | ||
b2edc0a7 | 2683 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2684 | |
b2edc0a7 PB |
2685 | /* let it sleep and repeat later if can't complete a request */ |
2686 | if (nr_events == 0) | |
2687 | break; | |
08f5439f JA |
2688 | /* |
2689 | * Ensure we allow local-to-the-cpu processing to take place, | |
2690 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2691 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2692 | */ |
3fcee5a6 PB |
2693 | if (need_resched()) { |
2694 | mutex_unlock(&ctx->uring_lock); | |
2695 | cond_resched(); | |
2696 | mutex_lock(&ctx->uring_lock); | |
2697 | } | |
def596e9 JA |
2698 | } |
2699 | mutex_unlock(&ctx->uring_lock); | |
2700 | } | |
2701 | ||
7668b92a | 2702 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2703 | { |
7668b92a | 2704 | unsigned int nr_events = 0; |
2b2ed975 | 2705 | int iters = 0, ret = 0; |
500f9fba | 2706 | |
c7849be9 XW |
2707 | /* |
2708 | * We disallow the app entering submit/complete with polling, but we | |
2709 | * still need to lock the ring to prevent racing with polled issue | |
2710 | * that got punted to a workqueue. | |
2711 | */ | |
2712 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2713 | do { |
a3a0e43f JA |
2714 | /* |
2715 | * Don't enter poll loop if we already have events pending. | |
2716 | * If we do, we can potentially be spinning for commands that | |
2717 | * already triggered a CQE (eg in error). | |
2718 | */ | |
6c503150 PB |
2719 | if (test_bit(0, &ctx->cq_check_overflow)) |
2720 | __io_cqring_overflow_flush(ctx, false, NULL, NULL); | |
2721 | if (io_cqring_events(ctx)) | |
a3a0e43f JA |
2722 | break; |
2723 | ||
500f9fba JA |
2724 | /* |
2725 | * If a submit got punted to a workqueue, we can have the | |
2726 | * application entering polling for a command before it gets | |
2727 | * issued. That app will hold the uring_lock for the duration | |
2728 | * of the poll right here, so we need to take a breather every | |
2729 | * now and then to ensure that the issue has a chance to add | |
2730 | * the poll to the issued list. Otherwise we can spin here | |
2731 | * forever, while the workqueue is stuck trying to acquire the | |
2732 | * very same mutex. | |
2733 | */ | |
2734 | if (!(++iters & 7)) { | |
2735 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2736 | io_run_task_work(); |
500f9fba JA |
2737 | mutex_lock(&ctx->uring_lock); |
2738 | } | |
2739 | ||
7668b92a | 2740 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2741 | if (ret <= 0) |
2742 | break; | |
2743 | ret = 0; | |
7668b92a | 2744 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2745 | |
500f9fba | 2746 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2747 | return ret; |
2748 | } | |
2749 | ||
491381ce | 2750 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2751 | { |
491381ce JA |
2752 | /* |
2753 | * Tell lockdep we inherited freeze protection from submission | |
2754 | * thread. | |
2755 | */ | |
2756 | if (req->flags & REQ_F_ISREG) { | |
2757 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2758 | |
491381ce | 2759 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2760 | } |
491381ce | 2761 | file_end_write(req->file); |
2b188cc1 JA |
2762 | } |
2763 | ||
a1d7c393 | 2764 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
889fca73 | 2765 | unsigned int issue_flags) |
2b188cc1 | 2766 | { |
9adbd45d | 2767 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2768 | int cflags = 0; |
2b188cc1 | 2769 | |
491381ce JA |
2770 | if (kiocb->ki_flags & IOCB_WRITE) |
2771 | kiocb_end_write(req); | |
2b188cc1 | 2772 | |
4e88d6e7 JA |
2773 | if (res != req->result) |
2774 | req_set_fail_links(req); | |
bcda7baa | 2775 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2776 | cflags = io_put_rw_kbuf(req); |
889fca73 | 2777 | __io_req_complete(req, issue_flags, res, cflags); |
ba816ad6 JA |
2778 | } |
2779 | ||
b63534c4 | 2780 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2781 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 JA |
2782 | { |
2783 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
4a245479 | 2784 | int rw, ret; |
b63534c4 | 2785 | struct iov_iter iter; |
b63534c4 | 2786 | |
dc2a6e9a PB |
2787 | /* already prepared */ |
2788 | if (req->async_data) | |
2789 | return true; | |
b63534c4 JA |
2790 | |
2791 | switch (req->opcode) { | |
2792 | case IORING_OP_READV: | |
2793 | case IORING_OP_READ_FIXED: | |
2794 | case IORING_OP_READ: | |
2795 | rw = READ; | |
2796 | break; | |
2797 | case IORING_OP_WRITEV: | |
2798 | case IORING_OP_WRITE_FIXED: | |
2799 | case IORING_OP_WRITE: | |
2800 | rw = WRITE; | |
2801 | break; | |
2802 | default: | |
2803 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2804 | req->opcode); | |
dc2a6e9a | 2805 | return false; |
b63534c4 JA |
2806 | } |
2807 | ||
dc2a6e9a PB |
2808 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2809 | if (ret < 0) | |
2810 | return false; | |
6bf985dc | 2811 | return !io_setup_async_rw(req, iovec, inline_vecs, &iter, false); |
b63534c4 | 2812 | } |
b63534c4 JA |
2813 | #endif |
2814 | ||
2815 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2816 | { | |
2817 | #ifdef CONFIG_BLOCK | |
bf6182b6 | 2818 | umode_t mode; |
b63534c4 JA |
2819 | int ret; |
2820 | ||
bf6182b6 | 2821 | if (res != -EAGAIN && res != -EOPNOTSUPP) |
355afaeb | 2822 | return false; |
bf6182b6 | 2823 | mode = file_inode(req->file)->i_mode; |
75c668cd PB |
2824 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2825 | return false; | |
2826 | if ((req->flags & REQ_F_NOWAIT) || io_wq_current_is_worker()) | |
b63534c4 JA |
2827 | return false; |
2828 | ||
55e6ac1e PB |
2829 | lockdep_assert_held(&req->ctx->uring_lock); |
2830 | ||
28cea78a | 2831 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2832 | |
dc2a6e9a | 2833 | if (!ret && io_resubmit_prep(req)) { |
fdee946d JA |
2834 | refcount_inc(&req->refs); |
2835 | io_queue_async_work(req); | |
b63534c4 | 2836 | return true; |
fdee946d | 2837 | } |
dc2a6e9a | 2838 | req_set_fail_links(req); |
b63534c4 JA |
2839 | #endif |
2840 | return false; | |
2841 | } | |
2842 | ||
a1d7c393 | 2843 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2844 | unsigned int issue_flags) |
a1d7c393 JA |
2845 | { |
2846 | if (!io_rw_reissue(req, res)) | |
889fca73 | 2847 | io_complete_rw_common(&req->rw.kiocb, res, issue_flags); |
ba816ad6 JA |
2848 | } |
2849 | ||
2850 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2851 | { | |
9adbd45d | 2852 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2853 | |
889fca73 | 2854 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2855 | } |
2856 | ||
def596e9 JA |
2857 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2858 | { | |
9adbd45d | 2859 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2860 | |
491381ce JA |
2861 | if (kiocb->ki_flags & IOCB_WRITE) |
2862 | kiocb_end_write(req); | |
def596e9 | 2863 | |
2d7d6792 | 2864 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2865 | req_set_fail_links(req); |
bbde017a XW |
2866 | |
2867 | WRITE_ONCE(req->result, res); | |
2868 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2869 | smp_wmb(); |
2870 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2871 | } |
2872 | ||
2873 | /* | |
2874 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2875 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2876 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2877 | * accessing the kiocb cookie. | |
2878 | */ | |
2e9dbe90 | 2879 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2880 | { |
2881 | struct io_ring_ctx *ctx = req->ctx; | |
2882 | ||
2883 | /* | |
2884 | * Track whether we have multiple files in our lists. This will impact | |
2885 | * how we do polling eventually, not spinning if we're on potentially | |
2886 | * different devices. | |
2887 | */ | |
540e32a0 | 2888 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2889 | ctx->poll_multi_file = false; |
2890 | } else if (!ctx->poll_multi_file) { | |
2891 | struct io_kiocb *list_req; | |
2892 | ||
540e32a0 | 2893 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2894 | inflight_entry); |
9adbd45d | 2895 | if (list_req->file != req->file) |
def596e9 JA |
2896 | ctx->poll_multi_file = true; |
2897 | } | |
2898 | ||
2899 | /* | |
2900 | * For fast devices, IO may have already completed. If it has, add | |
2901 | * it to the front so we find it first. | |
2902 | */ | |
65a6543d | 2903 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2904 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2905 | else |
d21ffe7e | 2906 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2907 | |
2e9dbe90 XW |
2908 | /* |
2909 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2910 | * task context or in io worker task context. If current task context is | |
2911 | * sq thread, we don't need to check whether should wake up sq thread. | |
2912 | */ | |
2913 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2914 | wq_has_sleeper(&ctx->sq_data->wait)) |
2915 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2916 | } |
2917 | ||
9f13c35b PB |
2918 | static inline void io_state_file_put(struct io_submit_state *state) |
2919 | { | |
02b23a9a PB |
2920 | if (state->file_refs) { |
2921 | fput_many(state->file, state->file_refs); | |
2922 | state->file_refs = 0; | |
2923 | } | |
9a56a232 JA |
2924 | } |
2925 | ||
2926 | /* | |
2927 | * Get as many references to a file as we have IOs left in this submission, | |
2928 | * assuming most submissions are for one file, or at least that each file | |
2929 | * has more than one submission. | |
2930 | */ | |
8da11c19 | 2931 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2932 | { |
2933 | if (!state) | |
2934 | return fget(fd); | |
2935 | ||
6e1271e6 | 2936 | if (state->file_refs) { |
9a56a232 | 2937 | if (state->fd == fd) { |
6e1271e6 | 2938 | state->file_refs--; |
9a56a232 JA |
2939 | return state->file; |
2940 | } | |
02b23a9a | 2941 | io_state_file_put(state); |
9a56a232 JA |
2942 | } |
2943 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2944 | if (unlikely(!state->file)) |
9a56a232 JA |
2945 | return NULL; |
2946 | ||
2947 | state->fd = fd; | |
6e1271e6 | 2948 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2949 | return state->file; |
2950 | } | |
2951 | ||
4503b767 JA |
2952 | static bool io_bdev_nowait(struct block_device *bdev) |
2953 | { | |
9ba0d0c8 | 2954 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2955 | } |
2956 | ||
2b188cc1 JA |
2957 | /* |
2958 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2959 | * any file. For now, just ensure that anything potentially problematic is done | |
2960 | * inline. | |
2961 | */ | |
af197f50 | 2962 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2963 | { |
2964 | umode_t mode = file_inode(file)->i_mode; | |
2965 | ||
4503b767 | 2966 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2967 | if (IS_ENABLED(CONFIG_BLOCK) && |
2968 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2969 | return true; |
2970 | return false; | |
2971 | } | |
2972 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2973 | return true; |
4503b767 | 2974 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2975 | if (IS_ENABLED(CONFIG_BLOCK) && |
2976 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2977 | file->f_op != &io_uring_fops) |
2978 | return true; | |
2979 | return false; | |
2980 | } | |
2b188cc1 | 2981 | |
c5b85625 JA |
2982 | /* any ->read/write should understand O_NONBLOCK */ |
2983 | if (file->f_flags & O_NONBLOCK) | |
2984 | return true; | |
2985 | ||
af197f50 JA |
2986 | if (!(file->f_mode & FMODE_NOWAIT)) |
2987 | return false; | |
2988 | ||
2989 | if (rw == READ) | |
2990 | return file->f_op->read_iter != NULL; | |
2991 | ||
2992 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2993 | } |
2994 | ||
a88fc400 | 2995 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2996 | { |
def596e9 | 2997 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2998 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2999 | struct file *file = req->file; |
09bb8394 JA |
3000 | unsigned ioprio; |
3001 | int ret; | |
2b188cc1 | 3002 | |
75c668cd | 3003 | if (S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
3004 | req->flags |= REQ_F_ISREG; |
3005 | ||
2b188cc1 | 3006 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 3007 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 3008 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 3009 | kiocb->ki_pos = file->f_pos; |
ba04291e | 3010 | } |
2b188cc1 | 3011 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
3012 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
3013 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
3014 | if (unlikely(ret)) | |
3015 | return ret; | |
2b188cc1 | 3016 | |
75c668cd PB |
3017 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
3018 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
3019 | req->flags |= REQ_F_NOWAIT; | |
3020 | ||
2b188cc1 JA |
3021 | ioprio = READ_ONCE(sqe->ioprio); |
3022 | if (ioprio) { | |
3023 | ret = ioprio_check_cap(ioprio); | |
3024 | if (ret) | |
09bb8394 | 3025 | return ret; |
2b188cc1 JA |
3026 | |
3027 | kiocb->ki_ioprio = ioprio; | |
3028 | } else | |
3029 | kiocb->ki_ioprio = get_current_ioprio(); | |
3030 | ||
def596e9 | 3031 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
3032 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
3033 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 3034 | return -EOPNOTSUPP; |
2b188cc1 | 3035 | |
def596e9 JA |
3036 | kiocb->ki_flags |= IOCB_HIPRI; |
3037 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 3038 | req->iopoll_completed = 0; |
def596e9 | 3039 | } else { |
09bb8394 JA |
3040 | if (kiocb->ki_flags & IOCB_HIPRI) |
3041 | return -EINVAL; | |
def596e9 JA |
3042 | kiocb->ki_complete = io_complete_rw; |
3043 | } | |
9adbd45d | 3044 | |
3529d8c2 JA |
3045 | req->rw.addr = READ_ONCE(sqe->addr); |
3046 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 3047 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3048 | return 0; |
2b188cc1 JA |
3049 | } |
3050 | ||
3051 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3052 | { | |
3053 | switch (ret) { | |
3054 | case -EIOCBQUEUED: | |
3055 | break; | |
3056 | case -ERESTARTSYS: | |
3057 | case -ERESTARTNOINTR: | |
3058 | case -ERESTARTNOHAND: | |
3059 | case -ERESTART_RESTARTBLOCK: | |
3060 | /* | |
3061 | * We can't just restart the syscall, since previously | |
3062 | * submitted sqes may already be in progress. Just fail this | |
3063 | * IO with EINTR. | |
3064 | */ | |
3065 | ret = -EINTR; | |
df561f66 | 3066 | fallthrough; |
2b188cc1 JA |
3067 | default: |
3068 | kiocb->ki_complete(kiocb, ret, 0); | |
3069 | } | |
3070 | } | |
3071 | ||
a1d7c393 | 3072 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 3073 | unsigned int issue_flags) |
ba816ad6 | 3074 | { |
ba04291e | 3075 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 3076 | struct io_async_rw *io = req->async_data; |
ba04291e | 3077 | |
227c0c96 | 3078 | /* add previously done IO, if any */ |
e8c2bc1f | 3079 | if (io && io->bytes_done > 0) { |
227c0c96 | 3080 | if (ret < 0) |
e8c2bc1f | 3081 | ret = io->bytes_done; |
227c0c96 | 3082 | else |
e8c2bc1f | 3083 | ret += io->bytes_done; |
227c0c96 JA |
3084 | } |
3085 | ||
ba04291e JA |
3086 | if (req->flags & REQ_F_CUR_POS) |
3087 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 3088 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
889fca73 | 3089 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
3090 | else |
3091 | io_rw_done(kiocb, ret); | |
3092 | } | |
3093 | ||
847595de | 3094 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
edafccee | 3095 | { |
9adbd45d JA |
3096 | struct io_ring_ctx *ctx = req->ctx; |
3097 | size_t len = req->rw.len; | |
edafccee | 3098 | struct io_mapped_ubuf *imu; |
4be1c615 | 3099 | u16 index, buf_index = req->buf_index; |
edafccee JA |
3100 | size_t offset; |
3101 | u64 buf_addr; | |
3102 | ||
edafccee JA |
3103 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3104 | return -EFAULT; | |
edafccee JA |
3105 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3106 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 3107 | buf_addr = req->rw.addr; |
edafccee JA |
3108 | |
3109 | /* overflow */ | |
3110 | if (buf_addr + len < buf_addr) | |
3111 | return -EFAULT; | |
3112 | /* not inside the mapped region */ | |
3113 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
3114 | return -EFAULT; | |
3115 | ||
3116 | /* | |
3117 | * May not be a start of buffer, set size appropriately | |
3118 | * and advance us to the beginning. | |
3119 | */ | |
3120 | offset = buf_addr - imu->ubuf; | |
3121 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3122 | |
3123 | if (offset) { | |
3124 | /* | |
3125 | * Don't use iov_iter_advance() here, as it's really slow for | |
3126 | * using the latter parts of a big fixed buffer - it iterates | |
3127 | * over each segment manually. We can cheat a bit here, because | |
3128 | * we know that: | |
3129 | * | |
3130 | * 1) it's a BVEC iter, we set it up | |
3131 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3132 | * first and last bvec | |
3133 | * | |
3134 | * So just find our index, and adjust the iterator afterwards. | |
3135 | * If the offset is within the first bvec (or the whole first | |
3136 | * bvec, just use iov_iter_advance(). This makes it easier | |
3137 | * since we can just skip the first segment, which may not | |
3138 | * be PAGE_SIZE aligned. | |
3139 | */ | |
3140 | const struct bio_vec *bvec = imu->bvec; | |
3141 | ||
3142 | if (offset <= bvec->bv_len) { | |
3143 | iov_iter_advance(iter, offset); | |
3144 | } else { | |
3145 | unsigned long seg_skip; | |
3146 | ||
3147 | /* skip first vec */ | |
3148 | offset -= bvec->bv_len; | |
3149 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3150 | ||
3151 | iter->bvec = bvec + seg_skip; | |
3152 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3153 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3154 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3155 | } |
3156 | } | |
3157 | ||
847595de | 3158 | return 0; |
edafccee JA |
3159 | } |
3160 | ||
bcda7baa JA |
3161 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3162 | { | |
3163 | if (needs_lock) | |
3164 | mutex_unlock(&ctx->uring_lock); | |
3165 | } | |
3166 | ||
3167 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3168 | { | |
3169 | /* | |
3170 | * "Normal" inline submissions always hold the uring_lock, since we | |
3171 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3172 | * The only exception is when we've detached the request and issue it | |
3173 | * from an async worker thread, grab the lock for that case. | |
3174 | */ | |
3175 | if (needs_lock) | |
3176 | mutex_lock(&ctx->uring_lock); | |
3177 | } | |
3178 | ||
3179 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3180 | int bgid, struct io_buffer *kbuf, | |
3181 | bool needs_lock) | |
3182 | { | |
3183 | struct io_buffer *head; | |
3184 | ||
3185 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3186 | return kbuf; | |
3187 | ||
3188 | io_ring_submit_lock(req->ctx, needs_lock); | |
3189 | ||
3190 | lockdep_assert_held(&req->ctx->uring_lock); | |
3191 | ||
3192 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3193 | if (head) { | |
3194 | if (!list_empty(&head->list)) { | |
3195 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3196 | list); | |
3197 | list_del(&kbuf->list); | |
3198 | } else { | |
3199 | kbuf = head; | |
3200 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3201 | } | |
3202 | if (*len > kbuf->len) | |
3203 | *len = kbuf->len; | |
3204 | } else { | |
3205 | kbuf = ERR_PTR(-ENOBUFS); | |
3206 | } | |
3207 | ||
3208 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3209 | ||
3210 | return kbuf; | |
3211 | } | |
3212 | ||
4d954c25 JA |
3213 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3214 | bool needs_lock) | |
3215 | { | |
3216 | struct io_buffer *kbuf; | |
4f4eeba8 | 3217 | u16 bgid; |
4d954c25 JA |
3218 | |
3219 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3220 | bgid = req->buf_index; |
4d954c25 JA |
3221 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3222 | if (IS_ERR(kbuf)) | |
3223 | return kbuf; | |
3224 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3225 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3226 | return u64_to_user_ptr(kbuf->addr); | |
3227 | } | |
3228 | ||
3229 | #ifdef CONFIG_COMPAT | |
3230 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3231 | bool needs_lock) | |
3232 | { | |
3233 | struct compat_iovec __user *uiov; | |
3234 | compat_ssize_t clen; | |
3235 | void __user *buf; | |
3236 | ssize_t len; | |
3237 | ||
3238 | uiov = u64_to_user_ptr(req->rw.addr); | |
3239 | if (!access_ok(uiov, sizeof(*uiov))) | |
3240 | return -EFAULT; | |
3241 | if (__get_user(clen, &uiov->iov_len)) | |
3242 | return -EFAULT; | |
3243 | if (clen < 0) | |
3244 | return -EINVAL; | |
3245 | ||
3246 | len = clen; | |
3247 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3248 | if (IS_ERR(buf)) | |
3249 | return PTR_ERR(buf); | |
3250 | iov[0].iov_base = buf; | |
3251 | iov[0].iov_len = (compat_size_t) len; | |
3252 | return 0; | |
3253 | } | |
3254 | #endif | |
3255 | ||
3256 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3257 | bool needs_lock) | |
3258 | { | |
3259 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3260 | void __user *buf; | |
3261 | ssize_t len; | |
3262 | ||
3263 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3264 | return -EFAULT; | |
3265 | ||
3266 | len = iov[0].iov_len; | |
3267 | if (len < 0) | |
3268 | return -EINVAL; | |
3269 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3270 | if (IS_ERR(buf)) | |
3271 | return PTR_ERR(buf); | |
3272 | iov[0].iov_base = buf; | |
3273 | iov[0].iov_len = len; | |
3274 | return 0; | |
3275 | } | |
3276 | ||
3277 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3278 | bool needs_lock) | |
3279 | { | |
dddb3e26 JA |
3280 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3281 | struct io_buffer *kbuf; | |
3282 | ||
3283 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3284 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3285 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3286 | return 0; |
dddb3e26 | 3287 | } |
dd201662 | 3288 | if (req->rw.len != 1) |
4d954c25 JA |
3289 | return -EINVAL; |
3290 | ||
3291 | #ifdef CONFIG_COMPAT | |
3292 | if (req->ctx->compat) | |
3293 | return io_compat_import(req, iov, needs_lock); | |
3294 | #endif | |
3295 | ||
3296 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3297 | } | |
3298 | ||
847595de PB |
3299 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3300 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3301 | { |
9adbd45d JA |
3302 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3303 | size_t sqe_len = req->rw.len; | |
847595de | 3304 | u8 opcode = req->opcode; |
4d954c25 | 3305 | ssize_t ret; |
edafccee | 3306 | |
7d009165 | 3307 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3308 | *iovec = NULL; |
9adbd45d | 3309 | return io_import_fixed(req, rw, iter); |
edafccee | 3310 | } |
2b188cc1 | 3311 | |
bcda7baa | 3312 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3313 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3314 | return -EINVAL; |
3315 | ||
3a6820f2 | 3316 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3317 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3318 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3319 | if (IS_ERR(buf)) |
4d954c25 | 3320 | return PTR_ERR(buf); |
3f9d6441 | 3321 | req->rw.len = sqe_len; |
bcda7baa JA |
3322 | } |
3323 | ||
3a6820f2 JA |
3324 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3325 | *iovec = NULL; | |
10fc72e4 | 3326 | return ret; |
3a6820f2 JA |
3327 | } |
3328 | ||
4d954c25 JA |
3329 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3330 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3331 | if (!ret) |
3332 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3333 | *iovec = NULL; |
3334 | return ret; | |
3335 | } | |
3336 | ||
89cd35c5 CH |
3337 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3338 | req->ctx->compat); | |
2b188cc1 JA |
3339 | } |
3340 | ||
0fef9483 JA |
3341 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3342 | { | |
5b09e37e | 3343 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3344 | } |
3345 | ||
31b51510 | 3346 | /* |
32960613 JA |
3347 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3348 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3349 | */ |
4017eb91 | 3350 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3351 | { |
4017eb91 JA |
3352 | struct kiocb *kiocb = &req->rw.kiocb; |
3353 | struct file *file = req->file; | |
32960613 JA |
3354 | ssize_t ret = 0; |
3355 | ||
3356 | /* | |
3357 | * Don't support polled IO through this interface, and we can't | |
3358 | * support non-blocking either. For the latter, this just causes | |
3359 | * the kiocb to be handled from an async context. | |
3360 | */ | |
3361 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3362 | return -EOPNOTSUPP; | |
3363 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3364 | return -EAGAIN; | |
3365 | ||
3366 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3367 | struct iovec iovec; |
32960613 JA |
3368 | ssize_t nr; |
3369 | ||
311ae9e1 PB |
3370 | if (!iov_iter_is_bvec(iter)) { |
3371 | iovec = iov_iter_iovec(iter); | |
3372 | } else { | |
4017eb91 JA |
3373 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3374 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3375 | } |
3376 | ||
32960613 JA |
3377 | if (rw == READ) { |
3378 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3379 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3380 | } else { |
3381 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3382 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3383 | } |
3384 | ||
3385 | if (nr < 0) { | |
3386 | if (!ret) | |
3387 | ret = nr; | |
3388 | break; | |
3389 | } | |
3390 | ret += nr; | |
3391 | if (nr != iovec.iov_len) | |
3392 | break; | |
4017eb91 JA |
3393 | req->rw.len -= nr; |
3394 | req->rw.addr += nr; | |
32960613 JA |
3395 | iov_iter_advance(iter, nr); |
3396 | } | |
3397 | ||
3398 | return ret; | |
3399 | } | |
3400 | ||
ff6165b2 JA |
3401 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3402 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3403 | { |
e8c2bc1f | 3404 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3405 | |
ff6165b2 | 3406 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3407 | rw->free_iovec = iovec; |
227c0c96 | 3408 | rw->bytes_done = 0; |
ff6165b2 | 3409 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3410 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3411 | return; |
b64e3444 | 3412 | if (!iovec) { |
ff6165b2 JA |
3413 | unsigned iov_off = 0; |
3414 | ||
3415 | rw->iter.iov = rw->fast_iov; | |
3416 | if (iter->iov != fast_iov) { | |
3417 | iov_off = iter->iov - fast_iov; | |
3418 | rw->iter.iov += iov_off; | |
3419 | } | |
3420 | if (rw->fast_iov != fast_iov) | |
3421 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3422 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3423 | } else { |
3424 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3425 | } |
3426 | } | |
3427 | ||
e8c2bc1f | 3428 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3429 | { |
e8c2bc1f JA |
3430 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3431 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3432 | return req->async_data == NULL; | |
3d9932a8 XW |
3433 | } |
3434 | ||
e8c2bc1f | 3435 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3436 | { |
e8c2bc1f | 3437 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3438 | return 0; |
3d9932a8 | 3439 | |
e8c2bc1f | 3440 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3441 | } |
3442 | ||
ff6165b2 JA |
3443 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3444 | const struct iovec *fast_iov, | |
227c0c96 | 3445 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3446 | { |
e8c2bc1f | 3447 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3448 | return 0; |
e8c2bc1f | 3449 | if (!req->async_data) { |
6bf985dc PB |
3450 | if (__io_alloc_async_data(req)) { |
3451 | kfree(iovec); | |
5d204bcf | 3452 | return -ENOMEM; |
6bf985dc | 3453 | } |
b7bb4f7d | 3454 | |
ff6165b2 | 3455 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3456 | } |
b7bb4f7d | 3457 | return 0; |
f67676d1 JA |
3458 | } |
3459 | ||
73debe68 | 3460 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3461 | { |
e8c2bc1f | 3462 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3463 | struct iovec *iov = iorw->fast_iov; |
847595de | 3464 | int ret; |
c3e330a4 | 3465 | |
2846c481 | 3466 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3467 | if (unlikely(ret < 0)) |
3468 | return ret; | |
3469 | ||
ab0b196c PB |
3470 | iorw->bytes_done = 0; |
3471 | iorw->free_iovec = iov; | |
3472 | if (iov) | |
3473 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3474 | return 0; |
3475 | } | |
3476 | ||
73debe68 | 3477 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3478 | { |
3479 | ssize_t ret; | |
3480 | ||
a88fc400 | 3481 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3482 | if (ret) |
3483 | return ret; | |
f67676d1 | 3484 | |
3529d8c2 JA |
3485 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3486 | return -EBADF; | |
f67676d1 | 3487 | |
5f798bea | 3488 | /* either don't need iovec imported or already have it */ |
2d199895 | 3489 | if (!req->async_data) |
3529d8c2 | 3490 | return 0; |
73debe68 | 3491 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3492 | } |
3493 | ||
c1dd91d1 JA |
3494 | /* |
3495 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3496 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3497 | * This gets called when the page is unlocked, and we generally expect that to | |
3498 | * happen when the page IO is completed and the page is now uptodate. This will | |
3499 | * queue a task_work based retry of the operation, attempting to copy the data | |
3500 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3501 | * do a thread based blocking retry of the operation. That's the unexpected | |
3502 | * slow path. | |
3503 | */ | |
bcf5a063 JA |
3504 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3505 | int sync, void *arg) | |
3506 | { | |
3507 | struct wait_page_queue *wpq; | |
3508 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3509 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3510 | int ret; |
3511 | ||
3512 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3513 | ||
cdc8fcb4 LT |
3514 | if (!wake_page_match(wpq, key)) |
3515 | return 0; | |
3516 | ||
c8d317aa | 3517 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3518 | list_del_init(&wait->entry); |
3519 | ||
7cbf1722 | 3520 | req->task_work.func = io_req_task_submit; |
6d816e08 JA |
3521 | percpu_ref_get(&req->ctx->refs); |
3522 | ||
bcf5a063 JA |
3523 | /* submit ref gets dropped, acquire a new one */ |
3524 | refcount_inc(&req->refs); | |
355fb9e2 | 3525 | ret = io_req_task_work_add(req); |
eab30c4d PB |
3526 | if (unlikely(ret)) |
3527 | io_req_task_work_add_fallback(req, io_req_task_cancel); | |
bcf5a063 JA |
3528 | return 1; |
3529 | } | |
3530 | ||
c1dd91d1 JA |
3531 | /* |
3532 | * This controls whether a given IO request should be armed for async page | |
3533 | * based retry. If we return false here, the request is handed to the async | |
3534 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3535 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3536 | * will either succeed because the page is now uptodate and unlocked, or it | |
3537 | * will register a callback when the page is unlocked at IO completion. Through | |
3538 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3539 | * That retry will attempt the buffered read again. The retry will generally | |
3540 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3541 | * async worker threads for a blocking retry. | |
3542 | */ | |
227c0c96 | 3543 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3544 | { |
e8c2bc1f JA |
3545 | struct io_async_rw *rw = req->async_data; |
3546 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3547 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3548 | |
bcf5a063 JA |
3549 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3550 | if (req->flags & REQ_F_NOWAIT) | |
3551 | return false; | |
f67676d1 | 3552 | |
227c0c96 | 3553 | /* Only for buffered IO */ |
3b2a4439 | 3554 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3555 | return false; |
3b2a4439 | 3556 | |
bcf5a063 JA |
3557 | /* |
3558 | * just use poll if we can, and don't attempt if the fs doesn't | |
3559 | * support callback based unlocks | |
3560 | */ | |
3561 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3562 | return false; | |
f67676d1 | 3563 | |
3b2a4439 JA |
3564 | wait->wait.func = io_async_buf_func; |
3565 | wait->wait.private = req; | |
3566 | wait->wait.flags = 0; | |
3567 | INIT_LIST_HEAD(&wait->wait.entry); | |
3568 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3569 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3570 | kiocb->ki_waitq = wait; |
3b2a4439 | 3571 | return true; |
bcf5a063 JA |
3572 | } |
3573 | ||
3574 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3575 | { | |
3576 | if (req->file->f_op->read_iter) | |
3577 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3578 | else if (req->file->f_op->read) |
4017eb91 | 3579 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3580 | else |
3581 | return -EINVAL; | |
f67676d1 JA |
3582 | } |
3583 | ||
889fca73 | 3584 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3585 | { |
3586 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3587 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3588 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3589 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3590 | ssize_t io_size, ret, ret2; |
45d189c6 | 3591 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3592 | |
2846c481 | 3593 | if (rw) { |
e8c2bc1f | 3594 | iter = &rw->iter; |
2846c481 PB |
3595 | iovec = NULL; |
3596 | } else { | |
3597 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3598 | if (ret < 0) | |
3599 | return ret; | |
3600 | } | |
632546c4 | 3601 | io_size = iov_iter_count(iter); |
fa15bafb | 3602 | req->result = io_size; |
2b188cc1 | 3603 | |
fd6c2e4c JA |
3604 | /* Ensure we clear previously set non-block flag */ |
3605 | if (!force_nonblock) | |
29de5f6a | 3606 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3607 | else |
3608 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3609 | ||
24c74678 | 3610 | /* If the file doesn't support async, just async punt */ |
6713e7a6 PB |
3611 | if (force_nonblock && !io_file_supports_async(req->file, READ)) { |
3612 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
6bf985dc | 3613 | return ret ?: -EAGAIN; |
6713e7a6 | 3614 | } |
9e645e11 | 3615 | |
632546c4 | 3616 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3617 | if (unlikely(ret)) { |
3618 | kfree(iovec); | |
3619 | return ret; | |
3620 | } | |
2b188cc1 | 3621 | |
227c0c96 | 3622 | ret = io_iter_do_read(req, iter); |
32960613 | 3623 | |
57cd657b | 3624 | if (ret == -EIOCBQUEUED) { |
5ea5dd45 PB |
3625 | /* it's faster to check here then delegate to kfree */ |
3626 | if (iovec) | |
3627 | kfree(iovec); | |
3628 | return 0; | |
227c0c96 | 3629 | } else if (ret == -EAGAIN) { |
eefdf30f JA |
3630 | /* IOPOLL retry should happen for io-wq threads */ |
3631 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3632 | goto done; |
75c668cd PB |
3633 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3634 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3635 | goto done; |
84216315 | 3636 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3637 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3638 | ret = 0; |
7335e3bf | 3639 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3640 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3641 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3642 | goto done; |
1a2cc0ce | 3643 | } |
227c0c96 | 3644 | |
227c0c96 | 3645 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3646 | if (ret2) |
3647 | return ret2; | |
3648 | ||
e8c2bc1f | 3649 | rw = req->async_data; |
227c0c96 | 3650 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3651 | iter = &rw->iter; |
227c0c96 | 3652 | |
b23df91b PB |
3653 | do { |
3654 | io_size -= ret; | |
3655 | rw->bytes_done += ret; | |
3656 | /* if we can retry, do so with the callbacks armed */ | |
3657 | if (!io_rw_should_retry(req)) { | |
3658 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3659 | return -EAGAIN; | |
3660 | } | |
3661 | ||
3662 | /* | |
3663 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3664 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3665 | * desired page gets unlocked. We can also get a partial read | |
3666 | * here, and if we do, then just retry at the new offset. | |
3667 | */ | |
3668 | ret = io_iter_do_read(req, iter); | |
3669 | if (ret == -EIOCBQUEUED) | |
3670 | return 0; | |
3671 | /* we got some bytes, but not all. retry. */ | |
3672 | } while (ret > 0 && ret < io_size); | |
227c0c96 | 3673 | done: |
889fca73 | 3674 | kiocb_done(kiocb, ret, issue_flags); |
5ea5dd45 | 3675 | return 0; |
2b188cc1 JA |
3676 | } |
3677 | ||
73debe68 | 3678 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3679 | { |
3680 | ssize_t ret; | |
3681 | ||
a88fc400 | 3682 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3683 | if (ret) |
3684 | return ret; | |
f67676d1 | 3685 | |
3529d8c2 JA |
3686 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3687 | return -EBADF; | |
f67676d1 | 3688 | |
5f798bea | 3689 | /* either don't need iovec imported or already have it */ |
2d199895 | 3690 | if (!req->async_data) |
3529d8c2 | 3691 | return 0; |
73debe68 | 3692 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3693 | } |
3694 | ||
889fca73 | 3695 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3696 | { |
3697 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3698 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3699 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3700 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3701 | ssize_t ret, ret2, io_size; |
45d189c6 | 3702 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3703 | |
2846c481 | 3704 | if (rw) { |
e8c2bc1f | 3705 | iter = &rw->iter; |
2846c481 PB |
3706 | iovec = NULL; |
3707 | } else { | |
3708 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3709 | if (ret < 0) | |
3710 | return ret; | |
3711 | } | |
632546c4 | 3712 | io_size = iov_iter_count(iter); |
fa15bafb | 3713 | req->result = io_size; |
2b188cc1 | 3714 | |
fd6c2e4c JA |
3715 | /* Ensure we clear previously set non-block flag */ |
3716 | if (!force_nonblock) | |
a88fc400 PB |
3717 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3718 | else | |
3719 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3720 | |
24c74678 | 3721 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3722 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3723 | goto copy_iov; |
31b51510 | 3724 | |
10d59345 JA |
3725 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3726 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3727 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3728 | goto copy_iov; |
31b51510 | 3729 | |
632546c4 | 3730 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3731 | if (unlikely(ret)) |
3732 | goto out_free; | |
4ed734b0 | 3733 | |
fa15bafb PB |
3734 | /* |
3735 | * Open-code file_start_write here to grab freeze protection, | |
3736 | * which will be released by another thread in | |
3737 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3738 | * released so that it doesn't complain about the held lock when | |
3739 | * we return to userspace. | |
3740 | */ | |
3741 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3742 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3743 | __sb_writers_release(file_inode(req->file)->i_sb, |
3744 | SB_FREEZE_WRITE); | |
3745 | } | |
3746 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3747 | |
fa15bafb | 3748 | if (req->file->f_op->write_iter) |
ff6165b2 | 3749 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3750 | else if (req->file->f_op->write) |
4017eb91 | 3751 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3752 | else |
3753 | ret2 = -EINVAL; | |
4ed734b0 | 3754 | |
fa15bafb PB |
3755 | /* |
3756 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3757 | * retry them without IOCB_NOWAIT. | |
3758 | */ | |
3759 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3760 | ret2 = -EAGAIN; | |
75c668cd PB |
3761 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3762 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3763 | goto done; |
fa15bafb | 3764 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3765 | /* IOPOLL retry should happen for io-wq threads */ |
3766 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3767 | goto copy_iov; | |
355afaeb | 3768 | done: |
889fca73 | 3769 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3770 | } else { |
f67676d1 | 3771 | copy_iov: |
84216315 | 3772 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3773 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3774 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3775 | return ret ?: -EAGAIN; |
2b188cc1 | 3776 | } |
31b51510 | 3777 | out_free: |
f261c168 | 3778 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3779 | if (iovec) |
6f2cc166 | 3780 | kfree(iovec); |
2b188cc1 JA |
3781 | return ret; |
3782 | } | |
3783 | ||
80a261fd JA |
3784 | static int io_renameat_prep(struct io_kiocb *req, |
3785 | const struct io_uring_sqe *sqe) | |
3786 | { | |
3787 | struct io_rename *ren = &req->rename; | |
3788 | const char __user *oldf, *newf; | |
3789 | ||
3790 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3791 | return -EBADF; | |
3792 | ||
3793 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3794 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3795 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3796 | ren->new_dfd = READ_ONCE(sqe->len); | |
3797 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3798 | ||
3799 | ren->oldpath = getname(oldf); | |
3800 | if (IS_ERR(ren->oldpath)) | |
3801 | return PTR_ERR(ren->oldpath); | |
3802 | ||
3803 | ren->newpath = getname(newf); | |
3804 | if (IS_ERR(ren->newpath)) { | |
3805 | putname(ren->oldpath); | |
3806 | return PTR_ERR(ren->newpath); | |
3807 | } | |
3808 | ||
3809 | req->flags |= REQ_F_NEED_CLEANUP; | |
3810 | return 0; | |
3811 | } | |
3812 | ||
45d189c6 | 3813 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3814 | { |
3815 | struct io_rename *ren = &req->rename; | |
3816 | int ret; | |
3817 | ||
45d189c6 | 3818 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3819 | return -EAGAIN; |
3820 | ||
3821 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3822 | ren->newpath, ren->flags); | |
3823 | ||
3824 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3825 | if (ret < 0) | |
3826 | req_set_fail_links(req); | |
3827 | io_req_complete(req, ret); | |
3828 | return 0; | |
3829 | } | |
3830 | ||
14a1143b JA |
3831 | static int io_unlinkat_prep(struct io_kiocb *req, |
3832 | const struct io_uring_sqe *sqe) | |
3833 | { | |
3834 | struct io_unlink *un = &req->unlink; | |
3835 | const char __user *fname; | |
3836 | ||
3837 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3838 | return -EBADF; | |
3839 | ||
3840 | un->dfd = READ_ONCE(sqe->fd); | |
3841 | ||
3842 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3843 | if (un->flags & ~AT_REMOVEDIR) | |
3844 | return -EINVAL; | |
3845 | ||
3846 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3847 | un->filename = getname(fname); | |
3848 | if (IS_ERR(un->filename)) | |
3849 | return PTR_ERR(un->filename); | |
3850 | ||
3851 | req->flags |= REQ_F_NEED_CLEANUP; | |
3852 | return 0; | |
3853 | } | |
3854 | ||
45d189c6 | 3855 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3856 | { |
3857 | struct io_unlink *un = &req->unlink; | |
3858 | int ret; | |
3859 | ||
45d189c6 | 3860 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3861 | return -EAGAIN; |
3862 | ||
3863 | if (un->flags & AT_REMOVEDIR) | |
3864 | ret = do_rmdir(un->dfd, un->filename); | |
3865 | else | |
3866 | ret = do_unlinkat(un->dfd, un->filename); | |
3867 | ||
3868 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3869 | if (ret < 0) | |
3870 | req_set_fail_links(req); | |
3871 | io_req_complete(req, ret); | |
3872 | return 0; | |
3873 | } | |
3874 | ||
36f4fa68 JA |
3875 | static int io_shutdown_prep(struct io_kiocb *req, |
3876 | const struct io_uring_sqe *sqe) | |
3877 | { | |
3878 | #if defined(CONFIG_NET) | |
3879 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3880 | return -EINVAL; | |
3881 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3882 | sqe->buf_index) | |
3883 | return -EINVAL; | |
3884 | ||
3885 | req->shutdown.how = READ_ONCE(sqe->len); | |
3886 | return 0; | |
3887 | #else | |
3888 | return -EOPNOTSUPP; | |
3889 | #endif | |
3890 | } | |
3891 | ||
45d189c6 | 3892 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3893 | { |
3894 | #if defined(CONFIG_NET) | |
3895 | struct socket *sock; | |
3896 | int ret; | |
3897 | ||
45d189c6 | 3898 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3899 | return -EAGAIN; |
3900 | ||
48aba79b | 3901 | sock = sock_from_file(req->file); |
36f4fa68 | 3902 | if (unlikely(!sock)) |
48aba79b | 3903 | return -ENOTSOCK; |
36f4fa68 JA |
3904 | |
3905 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d JA |
3906 | if (ret < 0) |
3907 | req_set_fail_links(req); | |
36f4fa68 JA |
3908 | io_req_complete(req, ret); |
3909 | return 0; | |
3910 | #else | |
3911 | return -EOPNOTSUPP; | |
3912 | #endif | |
3913 | } | |
3914 | ||
f2a8d5c7 PB |
3915 | static int __io_splice_prep(struct io_kiocb *req, |
3916 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3917 | { |
3918 | struct io_splice* sp = &req->splice; | |
3919 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3920 | |
3232dd02 PB |
3921 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3922 | return -EINVAL; | |
7d67af2c PB |
3923 | |
3924 | sp->file_in = NULL; | |
7d67af2c PB |
3925 | sp->len = READ_ONCE(sqe->len); |
3926 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3927 | ||
3928 | if (unlikely(sp->flags & ~valid_flags)) | |
3929 | return -EINVAL; | |
3930 | ||
8371adf5 PB |
3931 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3932 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3933 | if (!sp->file_in) | |
3934 | return -EBADF; | |
7d67af2c PB |
3935 | req->flags |= REQ_F_NEED_CLEANUP; |
3936 | ||
7cdaf587 XW |
3937 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3938 | /* | |
3939 | * Splice operation will be punted aync, and here need to | |
3940 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3941 | */ | |
3942 | io_req_init_async(req); | |
7d67af2c | 3943 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3944 | } |
7d67af2c PB |
3945 | |
3946 | return 0; | |
3947 | } | |
3948 | ||
f2a8d5c7 PB |
3949 | static int io_tee_prep(struct io_kiocb *req, |
3950 | const struct io_uring_sqe *sqe) | |
3951 | { | |
3952 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3953 | return -EINVAL; | |
3954 | return __io_splice_prep(req, sqe); | |
3955 | } | |
3956 | ||
45d189c6 | 3957 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3958 | { |
3959 | struct io_splice *sp = &req->splice; | |
3960 | struct file *in = sp->file_in; | |
3961 | struct file *out = sp->file_out; | |
3962 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3963 | long ret = 0; | |
3964 | ||
45d189c6 | 3965 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3966 | return -EAGAIN; |
3967 | if (sp->len) | |
3968 | ret = do_tee(in, out, sp->len, flags); | |
3969 | ||
3970 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3971 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3972 | ||
f2a8d5c7 PB |
3973 | if (ret != sp->len) |
3974 | req_set_fail_links(req); | |
e1e16097 | 3975 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3976 | return 0; |
3977 | } | |
3978 | ||
3979 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3980 | { | |
3981 | struct io_splice* sp = &req->splice; | |
3982 | ||
3983 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3984 | sp->off_out = READ_ONCE(sqe->off); | |
3985 | return __io_splice_prep(req, sqe); | |
3986 | } | |
3987 | ||
45d189c6 | 3988 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3989 | { |
3990 | struct io_splice *sp = &req->splice; | |
3991 | struct file *in = sp->file_in; | |
3992 | struct file *out = sp->file_out; | |
3993 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3994 | loff_t *poff_in, *poff_out; | |
c9687426 | 3995 | long ret = 0; |
7d67af2c | 3996 | |
45d189c6 | 3997 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3998 | return -EAGAIN; |
7d67af2c PB |
3999 | |
4000 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4001 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4002 | |
948a7749 | 4003 | if (sp->len) |
c9687426 | 4004 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
4005 | |
4006 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
4007 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4008 | ||
7d67af2c PB |
4009 | if (ret != sp->len) |
4010 | req_set_fail_links(req); | |
e1e16097 | 4011 | io_req_complete(req, ret); |
7d67af2c PB |
4012 | return 0; |
4013 | } | |
4014 | ||
2b188cc1 JA |
4015 | /* |
4016 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4017 | */ | |
889fca73 | 4018 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4019 | { |
4020 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4021 | |
def596e9 JA |
4022 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4023 | return -EINVAL; | |
4024 | ||
889fca73 | 4025 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4026 | return 0; |
4027 | } | |
4028 | ||
3529d8c2 | 4029 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4030 | { |
6b06314c | 4031 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4032 | |
09bb8394 JA |
4033 | if (!req->file) |
4034 | return -EBADF; | |
c992fe29 | 4035 | |
6b06314c | 4036 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4037 | return -EINVAL; |
edafccee | 4038 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
4039 | return -EINVAL; |
4040 | ||
8ed8d3c3 JA |
4041 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4042 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4043 | return -EINVAL; | |
4044 | ||
4045 | req->sync.off = READ_ONCE(sqe->off); | |
4046 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4047 | return 0; |
4048 | } | |
4049 | ||
45d189c6 | 4050 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4051 | { |
8ed8d3c3 | 4052 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4053 | int ret; |
4054 | ||
ac45abc0 | 4055 | /* fsync always requires a blocking context */ |
45d189c6 | 4056 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4057 | return -EAGAIN; |
4058 | ||
9adbd45d | 4059 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4060 | end > 0 ? end : LLONG_MAX, |
4061 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4062 | if (ret < 0) | |
4063 | req_set_fail_links(req); | |
e1e16097 | 4064 | io_req_complete(req, ret); |
c992fe29 CH |
4065 | return 0; |
4066 | } | |
4067 | ||
d63d1b5e JA |
4068 | static int io_fallocate_prep(struct io_kiocb *req, |
4069 | const struct io_uring_sqe *sqe) | |
4070 | { | |
4071 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
4072 | return -EINVAL; | |
3232dd02 PB |
4073 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4074 | return -EINVAL; | |
d63d1b5e JA |
4075 | |
4076 | req->sync.off = READ_ONCE(sqe->off); | |
4077 | req->sync.len = READ_ONCE(sqe->addr); | |
4078 | req->sync.mode = READ_ONCE(sqe->len); | |
4079 | return 0; | |
4080 | } | |
4081 | ||
45d189c6 | 4082 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4083 | { |
ac45abc0 PB |
4084 | int ret; |
4085 | ||
d63d1b5e | 4086 | /* fallocate always requiring blocking context */ |
45d189c6 | 4087 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4088 | return -EAGAIN; |
ac45abc0 PB |
4089 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4090 | req->sync.len); | |
ac45abc0 PB |
4091 | if (ret < 0) |
4092 | req_set_fail_links(req); | |
e1e16097 | 4093 | io_req_complete(req, ret); |
5d17b4a4 JA |
4094 | return 0; |
4095 | } | |
4096 | ||
ec65fea5 | 4097 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4098 | { |
f8748881 | 4099 | const char __user *fname; |
15b71abe | 4100 | int ret; |
b7bb4f7d | 4101 | |
ec65fea5 | 4102 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4103 | return -EINVAL; |
ec65fea5 | 4104 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4105 | return -EBADF; |
03b1230c | 4106 | |
ec65fea5 PB |
4107 | /* open.how should be already initialised */ |
4108 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4109 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4110 | |
25e72d10 PB |
4111 | req->open.dfd = READ_ONCE(sqe->fd); |
4112 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4113 | req->open.filename = getname(fname); |
15b71abe JA |
4114 | if (IS_ERR(req->open.filename)) { |
4115 | ret = PTR_ERR(req->open.filename); | |
4116 | req->open.filename = NULL; | |
4117 | return ret; | |
4118 | } | |
4022e7af | 4119 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4120 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4121 | return 0; |
03b1230c JA |
4122 | } |
4123 | ||
ec65fea5 PB |
4124 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4125 | { | |
4126 | u64 flags, mode; | |
4127 | ||
14587a46 | 4128 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4129 | return -EINVAL; |
ec65fea5 PB |
4130 | mode = READ_ONCE(sqe->len); |
4131 | flags = READ_ONCE(sqe->open_flags); | |
4132 | req->open.how = build_open_how(flags, mode); | |
4133 | return __io_openat_prep(req, sqe); | |
4134 | } | |
4135 | ||
cebdb986 | 4136 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4137 | { |
cebdb986 | 4138 | struct open_how __user *how; |
cebdb986 | 4139 | size_t len; |
0fa03c62 JA |
4140 | int ret; |
4141 | ||
14587a46 | 4142 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4143 | return -EINVAL; |
cebdb986 JA |
4144 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4145 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4146 | if (len < OPEN_HOW_SIZE_VER0) |
4147 | return -EINVAL; | |
3529d8c2 | 4148 | |
cebdb986 JA |
4149 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4150 | len); | |
4151 | if (ret) | |
4152 | return ret; | |
3529d8c2 | 4153 | |
ec65fea5 | 4154 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4155 | } |
4156 | ||
45d189c6 | 4157 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4158 | { |
4159 | struct open_flags op; | |
15b71abe | 4160 | struct file *file; |
3a81fd02 JA |
4161 | bool nonblock_set; |
4162 | bool resolve_nonblock; | |
15b71abe JA |
4163 | int ret; |
4164 | ||
cebdb986 | 4165 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4166 | if (ret) |
4167 | goto err; | |
3a81fd02 JA |
4168 | nonblock_set = op.open_flag & O_NONBLOCK; |
4169 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4170 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4171 | /* |
4172 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4173 | * it'll always -EAGAIN | |
4174 | */ | |
4175 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4176 | return -EAGAIN; | |
4177 | op.lookup_flags |= LOOKUP_CACHED; | |
4178 | op.open_flag |= O_NONBLOCK; | |
4179 | } | |
15b71abe | 4180 | |
4022e7af | 4181 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4182 | if (ret < 0) |
4183 | goto err; | |
4184 | ||
4185 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3a81fd02 | 4186 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
45d189c6 PB |
4187 | if ((!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK)) && |
4188 | file == ERR_PTR(-EAGAIN)) { | |
3a81fd02 JA |
4189 | /* |
4190 | * We could hang on to this 'fd', but seems like marginal | |
4191 | * gain for something that is now known to be a slower path. | |
4192 | * So just put it, and we'll get a new one when we retry. | |
4193 | */ | |
4194 | put_unused_fd(ret); | |
4195 | return -EAGAIN; | |
4196 | } | |
4197 | ||
15b71abe JA |
4198 | if (IS_ERR(file)) { |
4199 | put_unused_fd(ret); | |
4200 | ret = PTR_ERR(file); | |
4201 | } else { | |
45d189c6 | 4202 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) |
3a81fd02 | 4203 | file->f_flags &= ~O_NONBLOCK; |
15b71abe JA |
4204 | fsnotify_open(file); |
4205 | fd_install(ret, file); | |
4206 | } | |
4207 | err: | |
4208 | putname(req->open.filename); | |
8fef80bf | 4209 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4210 | if (ret < 0) |
4211 | req_set_fail_links(req); | |
e1e16097 | 4212 | io_req_complete(req, ret); |
15b71abe JA |
4213 | return 0; |
4214 | } | |
4215 | ||
45d189c6 | 4216 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4217 | { |
45d189c6 | 4218 | return io_openat2(req, issue_flags & IO_URING_F_NONBLOCK); |
cebdb986 JA |
4219 | } |
4220 | ||
067524e9 JA |
4221 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4222 | const struct io_uring_sqe *sqe) | |
4223 | { | |
4224 | struct io_provide_buf *p = &req->pbuf; | |
4225 | u64 tmp; | |
4226 | ||
4227 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4228 | return -EINVAL; | |
4229 | ||
4230 | tmp = READ_ONCE(sqe->fd); | |
4231 | if (!tmp || tmp > USHRT_MAX) | |
4232 | return -EINVAL; | |
4233 | ||
4234 | memset(p, 0, sizeof(*p)); | |
4235 | p->nbufs = tmp; | |
4236 | p->bgid = READ_ONCE(sqe->buf_group); | |
4237 | return 0; | |
4238 | } | |
4239 | ||
4240 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4241 | int bgid, unsigned nbufs) | |
4242 | { | |
4243 | unsigned i = 0; | |
4244 | ||
4245 | /* shouldn't happen */ | |
4246 | if (!nbufs) | |
4247 | return 0; | |
4248 | ||
4249 | /* the head kbuf is the list itself */ | |
4250 | while (!list_empty(&buf->list)) { | |
4251 | struct io_buffer *nxt; | |
4252 | ||
4253 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4254 | list_del(&nxt->list); | |
4255 | kfree(nxt); | |
4256 | if (++i == nbufs) | |
4257 | return i; | |
4258 | } | |
4259 | i++; | |
4260 | kfree(buf); | |
4261 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4262 | ||
4263 | return i; | |
4264 | } | |
4265 | ||
889fca73 | 4266 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4267 | { |
4268 | struct io_provide_buf *p = &req->pbuf; | |
4269 | struct io_ring_ctx *ctx = req->ctx; | |
4270 | struct io_buffer *head; | |
4271 | int ret = 0; | |
45d189c6 | 4272 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4273 | |
4274 | io_ring_submit_lock(ctx, !force_nonblock); | |
4275 | ||
4276 | lockdep_assert_held(&ctx->uring_lock); | |
4277 | ||
4278 | ret = -ENOENT; | |
4279 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4280 | if (head) | |
4281 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 JA |
4282 | if (ret < 0) |
4283 | req_set_fail_links(req); | |
067524e9 | 4284 | |
31bff9a5 PB |
4285 | /* need to hold the lock to complete IOPOLL requests */ |
4286 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4287 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4288 | io_ring_submit_unlock(ctx, !force_nonblock); |
4289 | } else { | |
4290 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4291 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4292 | } |
067524e9 JA |
4293 | return 0; |
4294 | } | |
4295 | ||
ddf0322d JA |
4296 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4297 | const struct io_uring_sqe *sqe) | |
4298 | { | |
4299 | struct io_provide_buf *p = &req->pbuf; | |
4300 | u64 tmp; | |
4301 | ||
4302 | if (sqe->ioprio || sqe->rw_flags) | |
4303 | return -EINVAL; | |
4304 | ||
4305 | tmp = READ_ONCE(sqe->fd); | |
4306 | if (!tmp || tmp > USHRT_MAX) | |
4307 | return -E2BIG; | |
4308 | p->nbufs = tmp; | |
4309 | p->addr = READ_ONCE(sqe->addr); | |
4310 | p->len = READ_ONCE(sqe->len); | |
4311 | ||
efe68c1c | 4312 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4313 | return -EFAULT; |
4314 | ||
4315 | p->bgid = READ_ONCE(sqe->buf_group); | |
4316 | tmp = READ_ONCE(sqe->off); | |
4317 | if (tmp > USHRT_MAX) | |
4318 | return -E2BIG; | |
4319 | p->bid = tmp; | |
4320 | return 0; | |
4321 | } | |
4322 | ||
4323 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4324 | { | |
4325 | struct io_buffer *buf; | |
4326 | u64 addr = pbuf->addr; | |
4327 | int i, bid = pbuf->bid; | |
4328 | ||
4329 | for (i = 0; i < pbuf->nbufs; i++) { | |
4330 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4331 | if (!buf) | |
4332 | break; | |
4333 | ||
4334 | buf->addr = addr; | |
4335 | buf->len = pbuf->len; | |
4336 | buf->bid = bid; | |
4337 | addr += pbuf->len; | |
4338 | bid++; | |
4339 | if (!*head) { | |
4340 | INIT_LIST_HEAD(&buf->list); | |
4341 | *head = buf; | |
4342 | } else { | |
4343 | list_add_tail(&buf->list, &(*head)->list); | |
4344 | } | |
4345 | } | |
4346 | ||
4347 | return i ? i : -ENOMEM; | |
4348 | } | |
4349 | ||
889fca73 | 4350 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4351 | { |
4352 | struct io_provide_buf *p = &req->pbuf; | |
4353 | struct io_ring_ctx *ctx = req->ctx; | |
4354 | struct io_buffer *head, *list; | |
4355 | int ret = 0; | |
45d189c6 | 4356 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4357 | |
4358 | io_ring_submit_lock(ctx, !force_nonblock); | |
4359 | ||
4360 | lockdep_assert_held(&ctx->uring_lock); | |
4361 | ||
4362 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4363 | ||
4364 | ret = io_add_buffers(p, &head); | |
4365 | if (ret < 0) | |
4366 | goto out; | |
4367 | ||
4368 | if (!list) { | |
4369 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4370 | GFP_KERNEL); | |
4371 | if (ret < 0) { | |
067524e9 | 4372 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4373 | goto out; |
4374 | } | |
4375 | } | |
4376 | out: | |
ddf0322d JA |
4377 | if (ret < 0) |
4378 | req_set_fail_links(req); | |
31bff9a5 PB |
4379 | |
4380 | /* need to hold the lock to complete IOPOLL requests */ | |
4381 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4382 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4383 | io_ring_submit_unlock(ctx, !force_nonblock); |
4384 | } else { | |
4385 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4386 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4387 | } |
ddf0322d | 4388 | return 0; |
cebdb986 JA |
4389 | } |
4390 | ||
3e4827b0 JA |
4391 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4392 | const struct io_uring_sqe *sqe) | |
4393 | { | |
4394 | #if defined(CONFIG_EPOLL) | |
4395 | if (sqe->ioprio || sqe->buf_index) | |
4396 | return -EINVAL; | |
6ca56f84 | 4397 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4398 | return -EINVAL; |
3e4827b0 JA |
4399 | |
4400 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4401 | req->epoll.op = READ_ONCE(sqe->len); | |
4402 | req->epoll.fd = READ_ONCE(sqe->off); | |
4403 | ||
4404 | if (ep_op_has_event(req->epoll.op)) { | |
4405 | struct epoll_event __user *ev; | |
4406 | ||
4407 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4408 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4409 | return -EFAULT; | |
4410 | } | |
4411 | ||
4412 | return 0; | |
4413 | #else | |
4414 | return -EOPNOTSUPP; | |
4415 | #endif | |
4416 | } | |
4417 | ||
889fca73 | 4418 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4419 | { |
4420 | #if defined(CONFIG_EPOLL) | |
4421 | struct io_epoll *ie = &req->epoll; | |
4422 | int ret; | |
45d189c6 | 4423 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4424 | |
4425 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4426 | if (force_nonblock && ret == -EAGAIN) | |
4427 | return -EAGAIN; | |
4428 | ||
4429 | if (ret < 0) | |
4430 | req_set_fail_links(req); | |
889fca73 | 4431 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4432 | return 0; |
4433 | #else | |
4434 | return -EOPNOTSUPP; | |
4435 | #endif | |
4436 | } | |
4437 | ||
c1ca757b JA |
4438 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4439 | { | |
4440 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4441 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4442 | return -EINVAL; | |
3232dd02 PB |
4443 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4444 | return -EINVAL; | |
c1ca757b JA |
4445 | |
4446 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4447 | req->madvise.len = READ_ONCE(sqe->len); | |
4448 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4449 | return 0; | |
4450 | #else | |
4451 | return -EOPNOTSUPP; | |
4452 | #endif | |
4453 | } | |
4454 | ||
45d189c6 | 4455 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4456 | { |
4457 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4458 | struct io_madvise *ma = &req->madvise; | |
4459 | int ret; | |
4460 | ||
45d189c6 | 4461 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4462 | return -EAGAIN; |
4463 | ||
0726b01e | 4464 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4465 | if (ret < 0) |
4466 | req_set_fail_links(req); | |
e1e16097 | 4467 | io_req_complete(req, ret); |
c1ca757b JA |
4468 | return 0; |
4469 | #else | |
4470 | return -EOPNOTSUPP; | |
4471 | #endif | |
4472 | } | |
4473 | ||
4840e418 JA |
4474 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4475 | { | |
4476 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4477 | return -EINVAL; | |
3232dd02 PB |
4478 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4479 | return -EINVAL; | |
4840e418 JA |
4480 | |
4481 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4482 | req->fadvise.len = READ_ONCE(sqe->len); | |
4483 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4484 | return 0; | |
4485 | } | |
4486 | ||
45d189c6 | 4487 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4488 | { |
4489 | struct io_fadvise *fa = &req->fadvise; | |
4490 | int ret; | |
4491 | ||
45d189c6 | 4492 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4493 | switch (fa->advice) { |
4494 | case POSIX_FADV_NORMAL: | |
4495 | case POSIX_FADV_RANDOM: | |
4496 | case POSIX_FADV_SEQUENTIAL: | |
4497 | break; | |
4498 | default: | |
4499 | return -EAGAIN; | |
4500 | } | |
4501 | } | |
4840e418 JA |
4502 | |
4503 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4504 | if (ret < 0) | |
4505 | req_set_fail_links(req); | |
e1e16097 | 4506 | io_req_complete(req, ret); |
4840e418 JA |
4507 | return 0; |
4508 | } | |
4509 | ||
eddc7ef5 JA |
4510 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4511 | { | |
6ca56f84 | 4512 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4513 | return -EINVAL; |
eddc7ef5 JA |
4514 | if (sqe->ioprio || sqe->buf_index) |
4515 | return -EINVAL; | |
9c280f90 | 4516 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4517 | return -EBADF; |
eddc7ef5 | 4518 | |
1d9e1288 BM |
4519 | req->statx.dfd = READ_ONCE(sqe->fd); |
4520 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4521 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4522 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4523 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4524 | |
4525 | return 0; | |
4526 | } | |
4527 | ||
45d189c6 | 4528 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4529 | { |
1d9e1288 | 4530 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4531 | int ret; |
4532 | ||
45d189c6 | 4533 | if (issue_flags & IO_URING_F_NONBLOCK) { |
5b0bbee4 JA |
4534 | /* only need file table for an actual valid fd */ |
4535 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4536 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4537 | return -EAGAIN; |
5b0bbee4 | 4538 | } |
eddc7ef5 | 4539 | |
e62753e4 BM |
4540 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4541 | ctx->buffer); | |
eddc7ef5 | 4542 | |
eddc7ef5 JA |
4543 | if (ret < 0) |
4544 | req_set_fail_links(req); | |
e1e16097 | 4545 | io_req_complete(req, ret); |
eddc7ef5 JA |
4546 | return 0; |
4547 | } | |
4548 | ||
b5dba59e JA |
4549 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4550 | { | |
14587a46 | 4551 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4552 | return -EINVAL; |
b5dba59e JA |
4553 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4554 | sqe->rw_flags || sqe->buf_index) | |
4555 | return -EINVAL; | |
9c280f90 | 4556 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4557 | return -EBADF; |
b5dba59e JA |
4558 | |
4559 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4560 | return 0; |
b5dba59e JA |
4561 | } |
4562 | ||
889fca73 | 4563 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4564 | { |
9eac1904 | 4565 | struct files_struct *files = current->files; |
3af73b28 | 4566 | struct io_close *close = &req->close; |
9eac1904 JA |
4567 | struct fdtable *fdt; |
4568 | struct file *file; | |
b5dba59e JA |
4569 | int ret; |
4570 | ||
9eac1904 JA |
4571 | file = NULL; |
4572 | ret = -EBADF; | |
4573 | spin_lock(&files->file_lock); | |
4574 | fdt = files_fdtable(files); | |
4575 | if (close->fd >= fdt->max_fds) { | |
4576 | spin_unlock(&files->file_lock); | |
4577 | goto err; | |
4578 | } | |
4579 | file = fdt->fd[close->fd]; | |
4580 | if (!file) { | |
4581 | spin_unlock(&files->file_lock); | |
4582 | goto err; | |
4583 | } | |
4584 | ||
4585 | if (file->f_op == &io_uring_fops) { | |
4586 | spin_unlock(&files->file_lock); | |
4587 | file = NULL; | |
4588 | goto err; | |
3af73b28 | 4589 | } |
b5dba59e JA |
4590 | |
4591 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4592 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4593 | spin_unlock(&files->file_lock); |
0bf0eefd | 4594 | return -EAGAIN; |
a2100672 | 4595 | } |
b5dba59e | 4596 | |
9eac1904 JA |
4597 | ret = __close_fd_get_file(close->fd, &file); |
4598 | spin_unlock(&files->file_lock); | |
4599 | if (ret < 0) { | |
4600 | if (ret == -ENOENT) | |
4601 | ret = -EBADF; | |
4602 | goto err; | |
4603 | } | |
4604 | ||
3af73b28 | 4605 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4606 | ret = filp_close(file, current->files); |
4607 | err: | |
3af73b28 PB |
4608 | if (ret < 0) |
4609 | req_set_fail_links(req); | |
9eac1904 JA |
4610 | if (file) |
4611 | fput(file); | |
889fca73 | 4612 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4613 | return 0; |
b5dba59e JA |
4614 | } |
4615 | ||
3529d8c2 | 4616 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4617 | { |
4618 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4619 | |
4620 | if (!req->file) | |
4621 | return -EBADF; | |
5d17b4a4 JA |
4622 | |
4623 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4624 | return -EINVAL; | |
4625 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4626 | return -EINVAL; | |
4627 | ||
8ed8d3c3 JA |
4628 | req->sync.off = READ_ONCE(sqe->off); |
4629 | req->sync.len = READ_ONCE(sqe->len); | |
4630 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4631 | return 0; |
4632 | } | |
4633 | ||
45d189c6 | 4634 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4635 | { |
8ed8d3c3 JA |
4636 | int ret; |
4637 | ||
ac45abc0 | 4638 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4639 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4640 | return -EAGAIN; |
4641 | ||
9adbd45d | 4642 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4643 | req->sync.flags); |
4644 | if (ret < 0) | |
4645 | req_set_fail_links(req); | |
e1e16097 | 4646 | io_req_complete(req, ret); |
5d17b4a4 JA |
4647 | return 0; |
4648 | } | |
4649 | ||
469956e8 | 4650 | #if defined(CONFIG_NET) |
02d27d89 PB |
4651 | static int io_setup_async_msg(struct io_kiocb *req, |
4652 | struct io_async_msghdr *kmsg) | |
4653 | { | |
e8c2bc1f JA |
4654 | struct io_async_msghdr *async_msg = req->async_data; |
4655 | ||
4656 | if (async_msg) | |
02d27d89 | 4657 | return -EAGAIN; |
e8c2bc1f | 4658 | if (io_alloc_async_data(req)) { |
257e84a5 | 4659 | kfree(kmsg->free_iov); |
02d27d89 PB |
4660 | return -ENOMEM; |
4661 | } | |
e8c2bc1f | 4662 | async_msg = req->async_data; |
02d27d89 | 4663 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4664 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4665 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4666 | /* if were using fast_iov, set it to the new one */ |
4667 | if (!async_msg->free_iov) | |
4668 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4669 | ||
02d27d89 PB |
4670 | return -EAGAIN; |
4671 | } | |
4672 | ||
2ae523ed PB |
4673 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4674 | struct io_async_msghdr *iomsg) | |
4675 | { | |
2ae523ed | 4676 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4677 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4678 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4679 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4680 | } |
4681 | ||
3529d8c2 | 4682 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4683 | { |
e8c2bc1f | 4684 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4685 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4686 | int ret; |
03b1230c | 4687 | |
d2b6f48b PB |
4688 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4689 | return -EINVAL; | |
4690 | ||
e47293fd | 4691 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4692 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4693 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4694 | |
d8768362 JA |
4695 | #ifdef CONFIG_COMPAT |
4696 | if (req->ctx->compat) | |
4697 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4698 | #endif | |
4699 | ||
e8c2bc1f | 4700 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4701 | return 0; |
e8c2bc1f | 4702 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4703 | if (!ret) |
4704 | req->flags |= REQ_F_NEED_CLEANUP; | |
4705 | return ret; | |
03b1230c JA |
4706 | } |
4707 | ||
889fca73 | 4708 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4709 | { |
6b754c8b | 4710 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4711 | struct socket *sock; |
7a7cacba | 4712 | unsigned flags; |
0fa03c62 JA |
4713 | int ret; |
4714 | ||
dba4a925 | 4715 | sock = sock_from_file(req->file); |
7a7cacba | 4716 | if (unlikely(!sock)) |
dba4a925 | 4717 | return -ENOTSOCK; |
3529d8c2 | 4718 | |
257e84a5 PB |
4719 | kmsg = req->async_data; |
4720 | if (!kmsg) { | |
7a7cacba PB |
4721 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4722 | if (ret) | |
4723 | return ret; | |
4724 | kmsg = &iomsg; | |
0fa03c62 | 4725 | } |
0fa03c62 | 4726 | |
7a7cacba PB |
4727 | flags = req->sr_msg.msg_flags; |
4728 | if (flags & MSG_DONTWAIT) | |
4729 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4730 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4731 | flags |= MSG_DONTWAIT; |
e47293fd | 4732 | |
7a7cacba | 4733 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4734 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4735 | return io_setup_async_msg(req, kmsg); |
4736 | if (ret == -ERESTARTSYS) | |
4737 | ret = -EINTR; | |
0fa03c62 | 4738 | |
257e84a5 PB |
4739 | /* fast path, check for non-NULL to avoid function call */ |
4740 | if (kmsg->free_iov) | |
4741 | kfree(kmsg->free_iov); | |
99bc4c38 | 4742 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4743 | if (ret < 0) |
4744 | req_set_fail_links(req); | |
889fca73 | 4745 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4746 | return 0; |
03b1230c | 4747 | } |
aa1fa28f | 4748 | |
889fca73 | 4749 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4750 | { |
7a7cacba PB |
4751 | struct io_sr_msg *sr = &req->sr_msg; |
4752 | struct msghdr msg; | |
4753 | struct iovec iov; | |
fddaface | 4754 | struct socket *sock; |
7a7cacba | 4755 | unsigned flags; |
fddaface JA |
4756 | int ret; |
4757 | ||
dba4a925 | 4758 | sock = sock_from_file(req->file); |
7a7cacba | 4759 | if (unlikely(!sock)) |
dba4a925 | 4760 | return -ENOTSOCK; |
fddaface | 4761 | |
7a7cacba PB |
4762 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4763 | if (unlikely(ret)) | |
14db8411 | 4764 | return ret; |
fddaface | 4765 | |
7a7cacba PB |
4766 | msg.msg_name = NULL; |
4767 | msg.msg_control = NULL; | |
4768 | msg.msg_controllen = 0; | |
4769 | msg.msg_namelen = 0; | |
fddaface | 4770 | |
7a7cacba PB |
4771 | flags = req->sr_msg.msg_flags; |
4772 | if (flags & MSG_DONTWAIT) | |
4773 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4774 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4775 | flags |= MSG_DONTWAIT; |
fddaface | 4776 | |
7a7cacba PB |
4777 | msg.msg_flags = flags; |
4778 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4779 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4780 | return -EAGAIN; |
4781 | if (ret == -ERESTARTSYS) | |
4782 | ret = -EINTR; | |
fddaface | 4783 | |
fddaface JA |
4784 | if (ret < 0) |
4785 | req_set_fail_links(req); | |
889fca73 | 4786 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4787 | return 0; |
fddaface JA |
4788 | } |
4789 | ||
1400e697 PB |
4790 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4791 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4792 | { |
4793 | struct io_sr_msg *sr = &req->sr_msg; | |
4794 | struct iovec __user *uiov; | |
4795 | size_t iov_len; | |
4796 | int ret; | |
4797 | ||
1400e697 PB |
4798 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4799 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4800 | if (ret) |
4801 | return ret; | |
4802 | ||
4803 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4804 | if (iov_len > 1) | |
4805 | return -EINVAL; | |
5476dfed | 4806 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4807 | return -EFAULT; |
5476dfed | 4808 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4809 | iomsg->free_iov = NULL; |
52de1fe1 | 4810 | } else { |
257e84a5 | 4811 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4812 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4813 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4814 | false); |
52de1fe1 JA |
4815 | if (ret > 0) |
4816 | ret = 0; | |
4817 | } | |
4818 | ||
4819 | return ret; | |
4820 | } | |
4821 | ||
4822 | #ifdef CONFIG_COMPAT | |
4823 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4824 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4825 | { |
4826 | struct compat_msghdr __user *msg_compat; | |
4827 | struct io_sr_msg *sr = &req->sr_msg; | |
4828 | struct compat_iovec __user *uiov; | |
4829 | compat_uptr_t ptr; | |
4830 | compat_size_t len; | |
4831 | int ret; | |
4832 | ||
270a5940 | 4833 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4834 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4835 | &ptr, &len); |
4836 | if (ret) | |
4837 | return ret; | |
4838 | ||
4839 | uiov = compat_ptr(ptr); | |
4840 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4841 | compat_ssize_t clen; | |
4842 | ||
4843 | if (len > 1) | |
4844 | return -EINVAL; | |
4845 | if (!access_ok(uiov, sizeof(*uiov))) | |
4846 | return -EFAULT; | |
4847 | if (__get_user(clen, &uiov->iov_len)) | |
4848 | return -EFAULT; | |
4849 | if (clen < 0) | |
4850 | return -EINVAL; | |
2d280bc8 | 4851 | sr->len = clen; |
257e84a5 | 4852 | iomsg->free_iov = NULL; |
52de1fe1 | 4853 | } else { |
257e84a5 | 4854 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4855 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4856 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4857 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4858 | if (ret < 0) |
4859 | return ret; | |
4860 | } | |
4861 | ||
4862 | return 0; | |
4863 | } | |
4864 | #endif | |
4865 | ||
1400e697 PB |
4866 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4867 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4868 | { |
1400e697 | 4869 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4870 | |
4871 | #ifdef CONFIG_COMPAT | |
4872 | if (req->ctx->compat) | |
1400e697 | 4873 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4874 | #endif |
52de1fe1 | 4875 | |
1400e697 | 4876 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4877 | } |
4878 | ||
bcda7baa | 4879 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4880 | bool needs_lock) |
bcda7baa JA |
4881 | { |
4882 | struct io_sr_msg *sr = &req->sr_msg; | |
4883 | struct io_buffer *kbuf; | |
4884 | ||
bcda7baa JA |
4885 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4886 | if (IS_ERR(kbuf)) | |
4887 | return kbuf; | |
4888 | ||
4889 | sr->kbuf = kbuf; | |
4890 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4891 | return kbuf; |
fddaface JA |
4892 | } |
4893 | ||
7fbb1b54 PB |
4894 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4895 | { | |
4896 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4897 | } | |
4898 | ||
3529d8c2 JA |
4899 | static int io_recvmsg_prep(struct io_kiocb *req, |
4900 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4901 | { |
e8c2bc1f | 4902 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4903 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4904 | int ret; |
3529d8c2 | 4905 | |
d2b6f48b PB |
4906 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4907 | return -EINVAL; | |
4908 | ||
3529d8c2 | 4909 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4910 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4911 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4912 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4913 | |
d8768362 JA |
4914 | #ifdef CONFIG_COMPAT |
4915 | if (req->ctx->compat) | |
4916 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4917 | #endif | |
4918 | ||
e8c2bc1f | 4919 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4920 | return 0; |
e8c2bc1f | 4921 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4922 | if (!ret) |
4923 | req->flags |= REQ_F_NEED_CLEANUP; | |
4924 | return ret; | |
aa1fa28f JA |
4925 | } |
4926 | ||
889fca73 | 4927 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4928 | { |
6b754c8b | 4929 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4930 | struct socket *sock; |
7fbb1b54 | 4931 | struct io_buffer *kbuf; |
7a7cacba | 4932 | unsigned flags; |
52de1fe1 | 4933 | int ret, cflags = 0; |
45d189c6 | 4934 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4935 | |
dba4a925 | 4936 | sock = sock_from_file(req->file); |
7a7cacba | 4937 | if (unlikely(!sock)) |
dba4a925 | 4938 | return -ENOTSOCK; |
3529d8c2 | 4939 | |
257e84a5 PB |
4940 | kmsg = req->async_data; |
4941 | if (!kmsg) { | |
7a7cacba PB |
4942 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4943 | if (ret) | |
681fda8d | 4944 | return ret; |
7a7cacba PB |
4945 | kmsg = &iomsg; |
4946 | } | |
03b1230c | 4947 | |
bc02ef33 | 4948 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4949 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4950 | if (IS_ERR(kbuf)) |
52de1fe1 | 4951 | return PTR_ERR(kbuf); |
7a7cacba | 4952 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4953 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4954 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4955 | 1, req->sr_msg.len); |
4956 | } | |
52de1fe1 | 4957 | |
7a7cacba PB |
4958 | flags = req->sr_msg.msg_flags; |
4959 | if (flags & MSG_DONTWAIT) | |
4960 | req->flags |= REQ_F_NOWAIT; | |
4961 | else if (force_nonblock) | |
4962 | flags |= MSG_DONTWAIT; | |
e47293fd | 4963 | |
7a7cacba PB |
4964 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4965 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4966 | if (force_nonblock && ret == -EAGAIN) |
4967 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4968 | if (ret == -ERESTARTSYS) |
4969 | ret = -EINTR; | |
03b1230c | 4970 | |
7fbb1b54 PB |
4971 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4972 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4973 | /* fast path, check for non-NULL to avoid function call */ |
4974 | if (kmsg->free_iov) | |
4975 | kfree(kmsg->free_iov); | |
99bc4c38 | 4976 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4977 | if (ret < 0) |
4978 | req_set_fail_links(req); | |
889fca73 | 4979 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4980 | return 0; |
0fa03c62 | 4981 | } |
5d17b4a4 | 4982 | |
889fca73 | 4983 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4984 | { |
6b754c8b | 4985 | struct io_buffer *kbuf; |
7a7cacba PB |
4986 | struct io_sr_msg *sr = &req->sr_msg; |
4987 | struct msghdr msg; | |
4988 | void __user *buf = sr->buf; | |
fddaface | 4989 | struct socket *sock; |
7a7cacba PB |
4990 | struct iovec iov; |
4991 | unsigned flags; | |
bcda7baa | 4992 | int ret, cflags = 0; |
45d189c6 | 4993 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4994 | |
dba4a925 | 4995 | sock = sock_from_file(req->file); |
7a7cacba | 4996 | if (unlikely(!sock)) |
dba4a925 | 4997 | return -ENOTSOCK; |
fddaface | 4998 | |
bc02ef33 | 4999 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5000 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
5001 | if (IS_ERR(kbuf)) |
5002 | return PTR_ERR(kbuf); | |
7a7cacba | 5003 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5004 | } |
bcda7baa | 5005 | |
7a7cacba | 5006 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5007 | if (unlikely(ret)) |
5008 | goto out_free; | |
fddaface | 5009 | |
7a7cacba PB |
5010 | msg.msg_name = NULL; |
5011 | msg.msg_control = NULL; | |
5012 | msg.msg_controllen = 0; | |
5013 | msg.msg_namelen = 0; | |
5014 | msg.msg_iocb = NULL; | |
5015 | msg.msg_flags = 0; | |
fddaface | 5016 | |
7a7cacba PB |
5017 | flags = req->sr_msg.msg_flags; |
5018 | if (flags & MSG_DONTWAIT) | |
5019 | req->flags |= REQ_F_NOWAIT; | |
5020 | else if (force_nonblock) | |
5021 | flags |= MSG_DONTWAIT; | |
5022 | ||
5023 | ret = sock_recvmsg(sock, &msg, flags); | |
5024 | if (force_nonblock && ret == -EAGAIN) | |
5025 | return -EAGAIN; | |
5026 | if (ret == -ERESTARTSYS) | |
5027 | ret = -EINTR; | |
14c32eee | 5028 | out_free: |
7fbb1b54 PB |
5029 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5030 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
5031 | if (ret < 0) |
5032 | req_set_fail_links(req); | |
889fca73 | 5033 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5034 | return 0; |
fddaface JA |
5035 | } |
5036 | ||
3529d8c2 | 5037 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5038 | { |
8ed8d3c3 JA |
5039 | struct io_accept *accept = &req->accept; |
5040 | ||
14587a46 | 5041 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5042 | return -EINVAL; |
8042d6ce | 5043 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5044 | return -EINVAL; |
5045 | ||
d55e5f5b JA |
5046 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5047 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5048 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5049 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 5050 | return 0; |
8ed8d3c3 | 5051 | } |
17f2fe35 | 5052 | |
889fca73 | 5053 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5054 | { |
5055 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5056 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5057 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
5058 | int ret; |
5059 | ||
e697deed JX |
5060 | if (req->file->f_flags & O_NONBLOCK) |
5061 | req->flags |= REQ_F_NOWAIT; | |
5062 | ||
8ed8d3c3 | 5063 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
5064 | accept->addr_len, accept->flags, |
5065 | accept->nofile); | |
8ed8d3c3 | 5066 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 5067 | return -EAGAIN; |
ac45abc0 PB |
5068 | if (ret < 0) { |
5069 | if (ret == -ERESTARTSYS) | |
5070 | ret = -EINTR; | |
4e88d6e7 | 5071 | req_set_fail_links(req); |
ac45abc0 | 5072 | } |
889fca73 | 5073 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5074 | return 0; |
8ed8d3c3 JA |
5075 | } |
5076 | ||
3529d8c2 | 5077 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5078 | { |
3529d8c2 | 5079 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 5080 | struct io_async_connect *io = req->async_data; |
f499a021 | 5081 | |
14587a46 | 5082 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
5083 | return -EINVAL; |
5084 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
5085 | return -EINVAL; | |
5086 | ||
3529d8c2 JA |
5087 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5088 | conn->addr_len = READ_ONCE(sqe->addr2); | |
5089 | ||
5090 | if (!io) | |
5091 | return 0; | |
5092 | ||
5093 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 5094 | &io->address); |
f499a021 JA |
5095 | } |
5096 | ||
889fca73 | 5097 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5098 | { |
e8c2bc1f | 5099 | struct io_async_connect __io, *io; |
f8e85cf2 | 5100 | unsigned file_flags; |
3fbb51c1 | 5101 | int ret; |
45d189c6 | 5102 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5103 | |
e8c2bc1f JA |
5104 | if (req->async_data) { |
5105 | io = req->async_data; | |
f499a021 | 5106 | } else { |
3529d8c2 JA |
5107 | ret = move_addr_to_kernel(req->connect.addr, |
5108 | req->connect.addr_len, | |
e8c2bc1f | 5109 | &__io.address); |
f499a021 JA |
5110 | if (ret) |
5111 | goto out; | |
5112 | io = &__io; | |
5113 | } | |
5114 | ||
3fbb51c1 JA |
5115 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5116 | ||
e8c2bc1f | 5117 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5118 | req->connect.addr_len, file_flags); |
87f80d62 | 5119 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5120 | if (req->async_data) |
b7bb4f7d | 5121 | return -EAGAIN; |
e8c2bc1f | 5122 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5123 | ret = -ENOMEM; |
5124 | goto out; | |
5125 | } | |
e8c2bc1f JA |
5126 | io = req->async_data; |
5127 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 5128 | return -EAGAIN; |
f499a021 | 5129 | } |
f8e85cf2 JA |
5130 | if (ret == -ERESTARTSYS) |
5131 | ret = -EINTR; | |
f499a021 | 5132 | out: |
4e88d6e7 JA |
5133 | if (ret < 0) |
5134 | req_set_fail_links(req); | |
889fca73 | 5135 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5136 | return 0; |
469956e8 Y |
5137 | } |
5138 | #else /* !CONFIG_NET */ | |
5139 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5140 | { | |
f8e85cf2 | 5141 | return -EOPNOTSUPP; |
f8e85cf2 JA |
5142 | } |
5143 | ||
889fca73 | 5144 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5145 | { |
5146 | return -EOPNOTSUPP; | |
5147 | } | |
5148 | ||
889fca73 | 5149 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5150 | { |
5151 | return -EOPNOTSUPP; | |
5152 | } | |
5153 | ||
5154 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5155 | const struct io_uring_sqe *sqe) | |
5156 | { | |
5157 | return -EOPNOTSUPP; | |
5158 | } | |
5159 | ||
889fca73 | 5160 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5161 | { |
5162 | return -EOPNOTSUPP; | |
5163 | } | |
5164 | ||
889fca73 | 5165 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5166 | { |
5167 | return -EOPNOTSUPP; | |
5168 | } | |
5169 | ||
5170 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5171 | { | |
5172 | return -EOPNOTSUPP; | |
5173 | } | |
5174 | ||
889fca73 | 5175 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5176 | { |
5177 | return -EOPNOTSUPP; | |
5178 | } | |
ce593a6c | 5179 | |
469956e8 Y |
5180 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5181 | { | |
5182 | return -EOPNOTSUPP; | |
5183 | } | |
5184 | ||
889fca73 | 5185 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 | 5186 | { |
f8e85cf2 | 5187 | return -EOPNOTSUPP; |
ce593a6c | 5188 | } |
469956e8 | 5189 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5190 | |
d7718a9d JA |
5191 | struct io_poll_table { |
5192 | struct poll_table_struct pt; | |
5193 | struct io_kiocb *req; | |
5194 | int error; | |
5195 | }; | |
ce593a6c | 5196 | |
d7718a9d JA |
5197 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5198 | __poll_t mask, task_work_func_t func) | |
5199 | { | |
aa96bf8a | 5200 | int ret; |
d7718a9d JA |
5201 | |
5202 | /* for instances that support it check for an event match first: */ | |
5203 | if (mask && !(mask & poll->events)) | |
5204 | return 0; | |
5205 | ||
5206 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5207 | ||
5208 | list_del_init(&poll->wait.entry); | |
5209 | ||
d7718a9d | 5210 | req->result = mask; |
7cbf1722 | 5211 | req->task_work.func = func; |
6d816e08 JA |
5212 | percpu_ref_get(&req->ctx->refs); |
5213 | ||
d7718a9d | 5214 | /* |
e3aabf95 JA |
5215 | * If this fails, then the task is exiting. When a task exits, the |
5216 | * work gets canceled, so just cancel this request as well instead | |
5217 | * of executing it. We can't safely execute it anyway, as we may not | |
5218 | * have the needed state needed for it anyway. | |
d7718a9d | 5219 | */ |
355fb9e2 | 5220 | ret = io_req_task_work_add(req); |
aa96bf8a | 5221 | if (unlikely(ret)) { |
e3aabf95 | 5222 | WRITE_ONCE(poll->canceled, true); |
eab30c4d | 5223 | io_req_task_work_add_fallback(req, func); |
aa96bf8a | 5224 | } |
d7718a9d JA |
5225 | return 1; |
5226 | } | |
5227 | ||
74ce6ce4 JA |
5228 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5229 | __acquires(&req->ctx->completion_lock) | |
5230 | { | |
5231 | struct io_ring_ctx *ctx = req->ctx; | |
5232 | ||
5233 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5234 | struct poll_table_struct pt = { ._key = poll->events }; | |
5235 | ||
5236 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5237 | } | |
5238 | ||
5239 | spin_lock_irq(&ctx->completion_lock); | |
5240 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5241 | add_wait_queue(poll->head, &poll->wait); | |
5242 | return true; | |
5243 | } | |
5244 | ||
5245 | return false; | |
5246 | } | |
5247 | ||
d4e7cd36 | 5248 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5249 | { |
e8c2bc1f | 5250 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5251 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5252 | return req->async_data; |
d4e7cd36 JA |
5253 | return req->apoll->double_poll; |
5254 | } | |
5255 | ||
5256 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5257 | { | |
5258 | if (req->opcode == IORING_OP_POLL_ADD) | |
5259 | return &req->poll; | |
5260 | return &req->apoll->poll; | |
5261 | } | |
5262 | ||
5263 | static void io_poll_remove_double(struct io_kiocb *req) | |
5264 | { | |
5265 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5266 | |
5267 | lockdep_assert_held(&req->ctx->completion_lock); | |
5268 | ||
5269 | if (poll && poll->head) { | |
5270 | struct wait_queue_head *head = poll->head; | |
5271 | ||
5272 | spin_lock(&head->lock); | |
5273 | list_del_init(&poll->wait.entry); | |
5274 | if (poll->wait.private) | |
5275 | refcount_dec(&req->refs); | |
5276 | poll->head = NULL; | |
5277 | spin_unlock(&head->lock); | |
5278 | } | |
5279 | } | |
5280 | ||
5281 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5282 | { | |
5283 | struct io_ring_ctx *ctx = req->ctx; | |
5284 | ||
d4e7cd36 | 5285 | io_poll_remove_double(req); |
18bceab1 JA |
5286 | req->poll.done = true; |
5287 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5288 | io_commit_cqring(ctx); | |
5289 | } | |
5290 | ||
dd221f46 | 5291 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5292 | { |
dd221f46 | 5293 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5294 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5295 | struct io_kiocb *nxt; |
18bceab1 JA |
5296 | |
5297 | if (io_poll_rewait(req, &req->poll)) { | |
5298 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5299 | } else { |
5300 | hash_del(&req->hash_node); | |
5301 | io_poll_complete(req, req->result, 0); | |
5302 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5303 | |
dd221f46 PB |
5304 | nxt = io_put_req_find_next(req); |
5305 | io_cqring_ev_posted(ctx); | |
5306 | if (nxt) | |
5307 | __io_req_task_submit(nxt); | |
5308 | } | |
18bceab1 | 5309 | |
6d816e08 | 5310 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5311 | } |
5312 | ||
5313 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5314 | int sync, void *key) | |
5315 | { | |
5316 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5317 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5318 | __poll_t mask = key_to_poll(key); |
5319 | ||
5320 | /* for instances that support it check for an event match first: */ | |
5321 | if (mask && !(mask & poll->events)) | |
5322 | return 0; | |
5323 | ||
8706e04e JA |
5324 | list_del_init(&wait->entry); |
5325 | ||
807abcb0 | 5326 | if (poll && poll->head) { |
18bceab1 JA |
5327 | bool done; |
5328 | ||
807abcb0 JA |
5329 | spin_lock(&poll->head->lock); |
5330 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5331 | if (!done) |
807abcb0 | 5332 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5333 | /* make sure double remove sees this as being gone */ |
5334 | wait->private = NULL; | |
807abcb0 | 5335 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5336 | if (!done) { |
5337 | /* use wait func handler, so it matches the rq type */ | |
5338 | poll->wait.func(&poll->wait, mode, sync, key); | |
5339 | } | |
18bceab1 JA |
5340 | } |
5341 | refcount_dec(&req->refs); | |
5342 | return 1; | |
5343 | } | |
5344 | ||
5345 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5346 | wait_queue_func_t wake_func) | |
5347 | { | |
5348 | poll->head = NULL; | |
5349 | poll->done = false; | |
5350 | poll->canceled = false; | |
5351 | poll->events = events; | |
5352 | INIT_LIST_HEAD(&poll->wait.entry); | |
5353 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5354 | } | |
5355 | ||
5356 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5357 | struct wait_queue_head *head, |
5358 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5359 | { |
5360 | struct io_kiocb *req = pt->req; | |
5361 | ||
5362 | /* | |
5363 | * If poll->head is already set, it's because the file being polled | |
5364 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5365 | * for write). Setup a separate io_poll_iocb if this happens. | |
5366 | */ | |
5367 | if (unlikely(poll->head)) { | |
58852d4d PB |
5368 | struct io_poll_iocb *poll_one = poll; |
5369 | ||
18bceab1 | 5370 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5371 | if (*poll_ptr) { |
18bceab1 JA |
5372 | pt->error = -EINVAL; |
5373 | return; | |
5374 | } | |
5375 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5376 | if (!poll) { | |
5377 | pt->error = -ENOMEM; | |
5378 | return; | |
5379 | } | |
58852d4d | 5380 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5381 | refcount_inc(&req->refs); |
5382 | poll->wait.private = req; | |
807abcb0 | 5383 | *poll_ptr = poll; |
18bceab1 JA |
5384 | } |
5385 | ||
5386 | pt->error = 0; | |
5387 | poll->head = head; | |
a31eb4a2 JX |
5388 | |
5389 | if (poll->events & EPOLLEXCLUSIVE) | |
5390 | add_wait_queue_exclusive(head, &poll->wait); | |
5391 | else | |
5392 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5393 | } |
5394 | ||
5395 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5396 | struct poll_table_struct *p) | |
5397 | { | |
5398 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5399 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5400 | |
807abcb0 | 5401 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5402 | } |
5403 | ||
d7718a9d JA |
5404 | static void io_async_task_func(struct callback_head *cb) |
5405 | { | |
5406 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5407 | struct async_poll *apoll = req->apoll; | |
5408 | struct io_ring_ctx *ctx = req->ctx; | |
5409 | ||
5410 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5411 | ||
74ce6ce4 | 5412 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5413 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5414 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5415 | return; |
d7718a9d JA |
5416 | } |
5417 | ||
31067255 | 5418 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5419 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5420 | hash_del(&req->hash_node); |
2bae047e | 5421 | |
d4e7cd36 | 5422 | io_poll_remove_double(req); |
74ce6ce4 JA |
5423 | spin_unlock_irq(&ctx->completion_lock); |
5424 | ||
0be0b0e3 PB |
5425 | if (!READ_ONCE(apoll->poll.canceled)) |
5426 | __io_req_task_submit(req); | |
5427 | else | |
5428 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5429 | |
6d816e08 | 5430 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5431 | kfree(apoll->double_poll); |
31067255 | 5432 | kfree(apoll); |
d7718a9d JA |
5433 | } |
5434 | ||
5435 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5436 | void *key) | |
5437 | { | |
5438 | struct io_kiocb *req = wait->private; | |
5439 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5440 | ||
5441 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5442 | key_to_poll(key)); | |
5443 | ||
5444 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5445 | } | |
5446 | ||
5447 | static void io_poll_req_insert(struct io_kiocb *req) | |
5448 | { | |
5449 | struct io_ring_ctx *ctx = req->ctx; | |
5450 | struct hlist_head *list; | |
5451 | ||
5452 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5453 | hlist_add_head(&req->hash_node, list); | |
5454 | } | |
5455 | ||
5456 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5457 | struct io_poll_iocb *poll, | |
5458 | struct io_poll_table *ipt, __poll_t mask, | |
5459 | wait_queue_func_t wake_func) | |
5460 | __acquires(&ctx->completion_lock) | |
5461 | { | |
5462 | struct io_ring_ctx *ctx = req->ctx; | |
5463 | bool cancel = false; | |
5464 | ||
4d52f338 | 5465 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5466 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5467 | poll->file = req->file; |
18bceab1 | 5468 | poll->wait.private = req; |
d7718a9d JA |
5469 | |
5470 | ipt->pt._key = mask; | |
5471 | ipt->req = req; | |
5472 | ipt->error = -EINVAL; | |
5473 | ||
d7718a9d JA |
5474 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5475 | ||
5476 | spin_lock_irq(&ctx->completion_lock); | |
5477 | if (likely(poll->head)) { | |
5478 | spin_lock(&poll->head->lock); | |
5479 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5480 | if (ipt->error) | |
5481 | cancel = true; | |
5482 | ipt->error = 0; | |
5483 | mask = 0; | |
5484 | } | |
5485 | if (mask || ipt->error) | |
5486 | list_del_init(&poll->wait.entry); | |
5487 | else if (cancel) | |
5488 | WRITE_ONCE(poll->canceled, true); | |
5489 | else if (!poll->done) /* actually waiting for an event */ | |
5490 | io_poll_req_insert(req); | |
5491 | spin_unlock(&poll->head->lock); | |
5492 | } | |
5493 | ||
5494 | return mask; | |
5495 | } | |
5496 | ||
5497 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5498 | { | |
5499 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5500 | struct io_ring_ctx *ctx = req->ctx; | |
5501 | struct async_poll *apoll; | |
5502 | struct io_poll_table ipt; | |
5503 | __poll_t mask, ret; | |
9dab14b8 | 5504 | int rw; |
d7718a9d JA |
5505 | |
5506 | if (!req->file || !file_can_poll(req->file)) | |
5507 | return false; | |
24c74678 | 5508 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5509 | return false; |
9dab14b8 JA |
5510 | if (def->pollin) |
5511 | rw = READ; | |
5512 | else if (def->pollout) | |
5513 | rw = WRITE; | |
5514 | else | |
5515 | return false; | |
5516 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5517 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5518 | return false; |
5519 | ||
5520 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5521 | if (unlikely(!apoll)) | |
5522 | return false; | |
807abcb0 | 5523 | apoll->double_poll = NULL; |
d7718a9d JA |
5524 | |
5525 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5526 | req->apoll = apoll; |
d7718a9d | 5527 | |
8755d97a | 5528 | mask = 0; |
d7718a9d | 5529 | if (def->pollin) |
8755d97a | 5530 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5531 | if (def->pollout) |
5532 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5533 | |
5534 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5535 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5536 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5537 | mask &= ~POLLIN; | |
5538 | ||
d7718a9d JA |
5539 | mask |= POLLERR | POLLPRI; |
5540 | ||
5541 | ipt.pt._qproc = io_async_queue_proc; | |
5542 | ||
5543 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5544 | io_async_wake); | |
a36da65c | 5545 | if (ret || ipt.error) { |
d4e7cd36 | 5546 | io_poll_remove_double(req); |
d7718a9d | 5547 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5548 | kfree(apoll->double_poll); |
d7718a9d JA |
5549 | kfree(apoll); |
5550 | return false; | |
5551 | } | |
5552 | spin_unlock_irq(&ctx->completion_lock); | |
5553 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5554 | apoll->poll.events); | |
5555 | return true; | |
5556 | } | |
5557 | ||
5558 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5559 | struct io_poll_iocb *poll) | |
221c5eb2 | 5560 | { |
b41e9852 | 5561 | bool do_complete = false; |
221c5eb2 JA |
5562 | |
5563 | spin_lock(&poll->head->lock); | |
5564 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5565 | if (!list_empty(&poll->wait.entry)) { |
5566 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5567 | do_complete = true; |
221c5eb2 JA |
5568 | } |
5569 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5570 | hash_del(&req->hash_node); |
d7718a9d JA |
5571 | return do_complete; |
5572 | } | |
5573 | ||
5574 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5575 | { | |
5576 | bool do_complete; | |
5577 | ||
d4e7cd36 JA |
5578 | io_poll_remove_double(req); |
5579 | ||
d7718a9d JA |
5580 | if (req->opcode == IORING_OP_POLL_ADD) { |
5581 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5582 | } else { | |
3bfa5bcb JA |
5583 | struct async_poll *apoll = req->apoll; |
5584 | ||
d7718a9d | 5585 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5586 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5587 | if (do_complete) { | |
d7718a9d | 5588 | io_put_req(req); |
807abcb0 | 5589 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5590 | kfree(apoll); |
5591 | } | |
b1f573bd XW |
5592 | } |
5593 | ||
b41e9852 JA |
5594 | if (do_complete) { |
5595 | io_cqring_fill_event(req, -ECANCELED); | |
5596 | io_commit_cqring(req->ctx); | |
f254ac04 | 5597 | req_set_fail_links(req); |
216578e5 | 5598 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5599 | } |
5600 | ||
5601 | return do_complete; | |
221c5eb2 JA |
5602 | } |
5603 | ||
76e1b642 JA |
5604 | /* |
5605 | * Returns true if we found and killed one or more poll requests | |
5606 | */ | |
6b81928d PB |
5607 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5608 | struct files_struct *files) | |
221c5eb2 | 5609 | { |
78076bb6 | 5610 | struct hlist_node *tmp; |
221c5eb2 | 5611 | struct io_kiocb *req; |
8e2e1faf | 5612 | int posted = 0, i; |
221c5eb2 JA |
5613 | |
5614 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5615 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5616 | struct hlist_head *list; | |
5617 | ||
5618 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5619 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5620 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5621 | posted += io_poll_remove_one(req); |
5622 | } | |
221c5eb2 JA |
5623 | } |
5624 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5625 | |
8e2e1faf JA |
5626 | if (posted) |
5627 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5628 | |
5629 | return posted != 0; | |
221c5eb2 JA |
5630 | } |
5631 | ||
47f46768 JA |
5632 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5633 | { | |
78076bb6 | 5634 | struct hlist_head *list; |
47f46768 JA |
5635 | struct io_kiocb *req; |
5636 | ||
78076bb6 JA |
5637 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5638 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5639 | if (sqe_addr != req->user_data) |
5640 | continue; | |
5641 | if (io_poll_remove_one(req)) | |
eac406c6 | 5642 | return 0; |
b41e9852 | 5643 | return -EALREADY; |
47f46768 JA |
5644 | } |
5645 | ||
5646 | return -ENOENT; | |
5647 | } | |
5648 | ||
3529d8c2 JA |
5649 | static int io_poll_remove_prep(struct io_kiocb *req, |
5650 | const struct io_uring_sqe *sqe) | |
0969e783 | 5651 | { |
0969e783 JA |
5652 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5653 | return -EINVAL; | |
5654 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5655 | sqe->poll_events) | |
5656 | return -EINVAL; | |
5657 | ||
018043be | 5658 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5659 | return 0; |
5660 | } | |
5661 | ||
221c5eb2 JA |
5662 | /* |
5663 | * Find a running poll command that matches one specified in sqe->addr, | |
5664 | * and remove it if found. | |
5665 | */ | |
61e98203 | 5666 | static int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) |
221c5eb2 JA |
5667 | { |
5668 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5669 | int ret; |
221c5eb2 | 5670 | |
221c5eb2 | 5671 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5672 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5673 | spin_unlock_irq(&ctx->completion_lock); |
5674 | ||
4e88d6e7 JA |
5675 | if (ret < 0) |
5676 | req_set_fail_links(req); | |
e1e16097 | 5677 | io_req_complete(req, ret); |
221c5eb2 JA |
5678 | return 0; |
5679 | } | |
5680 | ||
221c5eb2 JA |
5681 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5682 | void *key) | |
5683 | { | |
c2f2eb7d JA |
5684 | struct io_kiocb *req = wait->private; |
5685 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5686 | |
d7718a9d | 5687 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5688 | } |
5689 | ||
221c5eb2 JA |
5690 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5691 | struct poll_table_struct *p) | |
5692 | { | |
5693 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5694 | ||
e8c2bc1f | 5695 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5696 | } |
5697 | ||
3529d8c2 | 5698 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5699 | { |
5700 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5701 | u32 events; |
221c5eb2 JA |
5702 | |
5703 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5704 | return -EINVAL; | |
5705 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5706 | return -EINVAL; | |
5707 | ||
5769a351 JX |
5708 | events = READ_ONCE(sqe->poll32_events); |
5709 | #ifdef __BIG_ENDIAN | |
5710 | events = swahw32(events); | |
5711 | #endif | |
a31eb4a2 JX |
5712 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5713 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5714 | return 0; |
5715 | } | |
5716 | ||
61e98203 | 5717 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5718 | { |
5719 | struct io_poll_iocb *poll = &req->poll; | |
5720 | struct io_ring_ctx *ctx = req->ctx; | |
5721 | struct io_poll_table ipt; | |
0969e783 | 5722 | __poll_t mask; |
0969e783 | 5723 | |
d7718a9d | 5724 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5725 | |
d7718a9d JA |
5726 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5727 | io_poll_wake); | |
221c5eb2 | 5728 | |
8c838788 | 5729 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5730 | ipt.error = 0; |
b0dd8a41 | 5731 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5732 | } |
221c5eb2 JA |
5733 | spin_unlock_irq(&ctx->completion_lock); |
5734 | ||
8c838788 JA |
5735 | if (mask) { |
5736 | io_cqring_ev_posted(ctx); | |
014db007 | 5737 | io_put_req(req); |
221c5eb2 | 5738 | } |
8c838788 | 5739 | return ipt.error; |
221c5eb2 JA |
5740 | } |
5741 | ||
5262f567 JA |
5742 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5743 | { | |
ad8a48ac JA |
5744 | struct io_timeout_data *data = container_of(timer, |
5745 | struct io_timeout_data, timer); | |
5746 | struct io_kiocb *req = data->req; | |
5747 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5748 | unsigned long flags; |
5749 | ||
5262f567 | 5750 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5751 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5752 | atomic_set(&req->ctx->cq_timeouts, |
5753 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5754 | ||
78e19bbe | 5755 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5756 | io_commit_cqring(ctx); |
5757 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5758 | ||
5759 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5760 | req_set_fail_links(req); |
5262f567 JA |
5761 | io_put_req(req); |
5762 | return HRTIMER_NORESTART; | |
5763 | } | |
5764 | ||
fbd15848 PB |
5765 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5766 | __u64 user_data) | |
f254ac04 | 5767 | { |
fbd15848 | 5768 | struct io_timeout_data *io; |
47f46768 JA |
5769 | struct io_kiocb *req; |
5770 | int ret = -ENOENT; | |
f254ac04 | 5771 | |
135fcde8 | 5772 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5773 | if (user_data == req->user_data) { |
47f46768 JA |
5774 | ret = 0; |
5775 | break; | |
5776 | } | |
5777 | } | |
5778 | ||
5779 | if (ret == -ENOENT) | |
fbd15848 PB |
5780 | return ERR_PTR(ret); |
5781 | ||
5782 | io = req->async_data; | |
e8c2bc1f | 5783 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 | 5784 | if (ret == -1) |
fbd15848 | 5785 | return ERR_PTR(-EALREADY); |
a71976f3 | 5786 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5787 | return req; |
5788 | } | |
47f46768 | 5789 | |
fbd15848 PB |
5790 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5791 | { | |
5792 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5793 | ||
5794 | if (IS_ERR(req)) | |
5795 | return PTR_ERR(req); | |
f254ac04 JA |
5796 | |
5797 | req_set_fail_links(req); | |
f254ac04 | 5798 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5799 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5800 | return 0; |
5801 | } | |
5802 | ||
9c8e11b3 PB |
5803 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5804 | struct timespec64 *ts, enum hrtimer_mode mode) | |
47f46768 | 5805 | { |
9c8e11b3 PB |
5806 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5807 | struct io_timeout_data *data; | |
47f46768 | 5808 | |
9c8e11b3 PB |
5809 | if (IS_ERR(req)) |
5810 | return PTR_ERR(req); | |
47f46768 | 5811 | |
9c8e11b3 PB |
5812 | req->timeout.off = 0; /* noseq */ |
5813 | data = req->async_data; | |
5814 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5815 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5816 | data->timer.function = io_timeout_fn; | |
5817 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5818 | return 0; | |
47f46768 JA |
5819 | } |
5820 | ||
3529d8c2 JA |
5821 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5822 | const struct io_uring_sqe *sqe) | |
b29472ee | 5823 | { |
9c8e11b3 PB |
5824 | struct io_timeout_rem *tr = &req->timeout_rem; |
5825 | ||
b29472ee JA |
5826 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5827 | return -EINVAL; | |
61710e43 DA |
5828 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5829 | return -EINVAL; | |
9c8e11b3 | 5830 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5831 | return -EINVAL; |
5832 | ||
9c8e11b3 PB |
5833 | tr->addr = READ_ONCE(sqe->addr); |
5834 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5835 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5836 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5837 | return -EINVAL; | |
5838 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5839 | return -EFAULT; | |
5840 | } else if (tr->flags) { | |
5841 | /* timeout removal doesn't support flags */ | |
b29472ee | 5842 | return -EINVAL; |
9c8e11b3 | 5843 | } |
b29472ee | 5844 | |
b29472ee JA |
5845 | return 0; |
5846 | } | |
5847 | ||
8662daec PB |
5848 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5849 | { | |
5850 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5851 | : HRTIMER_MODE_REL; | |
5852 | } | |
5853 | ||
11365043 JA |
5854 | /* |
5855 | * Remove or update an existing timeout command | |
5856 | */ | |
61e98203 | 5857 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5858 | { |
9c8e11b3 | 5859 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5860 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5861 | int ret; |
11365043 | 5862 | |
11365043 | 5863 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5864 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5865 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5866 | else |
5867 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5868 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5869 | |
47f46768 | 5870 | io_cqring_fill_event(req, ret); |
11365043 JA |
5871 | io_commit_cqring(ctx); |
5872 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5873 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5874 | if (ret < 0) |
5875 | req_set_fail_links(req); | |
ec9c02ad | 5876 | io_put_req(req); |
11365043 | 5877 | return 0; |
5262f567 JA |
5878 | } |
5879 | ||
3529d8c2 | 5880 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5881 | bool is_timeout_link) |
5262f567 | 5882 | { |
ad8a48ac | 5883 | struct io_timeout_data *data; |
a41525ab | 5884 | unsigned flags; |
56080b02 | 5885 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5886 | |
ad8a48ac | 5887 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5888 | return -EINVAL; |
ad8a48ac | 5889 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5890 | return -EINVAL; |
56080b02 | 5891 | if (off && is_timeout_link) |
2d28390a | 5892 | return -EINVAL; |
a41525ab JA |
5893 | flags = READ_ONCE(sqe->timeout_flags); |
5894 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5895 | return -EINVAL; |
bdf20073 | 5896 | |
bfe68a22 | 5897 | req->timeout.off = off; |
26a61679 | 5898 | |
e8c2bc1f | 5899 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5900 | return -ENOMEM; |
5901 | ||
e8c2bc1f | 5902 | data = req->async_data; |
ad8a48ac | 5903 | data->req = req; |
ad8a48ac JA |
5904 | |
5905 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5906 | return -EFAULT; |
5907 | ||
8662daec | 5908 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac JA |
5909 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5910 | return 0; | |
5911 | } | |
5912 | ||
61e98203 | 5913 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5914 | { |
ad8a48ac | 5915 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5916 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5917 | struct list_head *entry; |
bfe68a22 | 5918 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5919 | |
733f5c95 | 5920 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5921 | |
5262f567 JA |
5922 | /* |
5923 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5924 | * timeout event to be satisfied. If it isn't set, then this is |
5925 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5926 | */ |
8eb7e2d0 | 5927 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5928 | entry = ctx->timeout_list.prev; |
5929 | goto add; | |
5930 | } | |
5262f567 | 5931 | |
bfe68a22 PB |
5932 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5933 | req->timeout.target_seq = tail + off; | |
5262f567 | 5934 | |
f010505b MDG |
5935 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5936 | * This is safe because ->completion_lock is held, and submissions | |
5937 | * and completions are never mixed in the same ->completion_lock section. | |
5938 | */ | |
5939 | ctx->cq_last_tm_flush = tail; | |
5940 | ||
5262f567 JA |
5941 | /* |
5942 | * Insertion sort, ensuring the first entry in the list is always | |
5943 | * the one we need first. | |
5944 | */ | |
5262f567 | 5945 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5946 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5947 | timeout.list); | |
5262f567 | 5948 | |
8eb7e2d0 | 5949 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5950 | continue; |
bfe68a22 PB |
5951 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5952 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5953 | break; |
5954 | } | |
93bd25bb | 5955 | add: |
135fcde8 | 5956 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5957 | data->timer.function = io_timeout_fn; |
5958 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5959 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5960 | return 0; |
5961 | } | |
5262f567 | 5962 | |
62755e35 JA |
5963 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5964 | { | |
5965 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5966 | ||
5967 | return req->user_data == (unsigned long) data; | |
5968 | } | |
5969 | ||
e977d6d3 | 5970 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5971 | { |
62755e35 | 5972 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5973 | int ret = 0; |
5974 | ||
4f26bda1 | 5975 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5976 | switch (cancel_ret) { |
5977 | case IO_WQ_CANCEL_OK: | |
5978 | ret = 0; | |
5979 | break; | |
5980 | case IO_WQ_CANCEL_RUNNING: | |
5981 | ret = -EALREADY; | |
5982 | break; | |
5983 | case IO_WQ_CANCEL_NOTFOUND: | |
5984 | ret = -ENOENT; | |
5985 | break; | |
5986 | } | |
5987 | ||
e977d6d3 JA |
5988 | return ret; |
5989 | } | |
5990 | ||
47f46768 JA |
5991 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5992 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5993 | int success_ret) |
47f46768 JA |
5994 | { |
5995 | unsigned long flags; | |
5996 | int ret; | |
5997 | ||
5998 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5999 | if (ret != -ENOENT) { | |
6000 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6001 | goto done; | |
6002 | } | |
6003 | ||
6004 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6005 | ret = io_timeout_cancel(ctx, sqe_addr); | |
6006 | if (ret != -ENOENT) | |
6007 | goto done; | |
6008 | ret = io_poll_cancel(ctx, sqe_addr); | |
6009 | done: | |
b0dd8a41 JA |
6010 | if (!ret) |
6011 | ret = success_ret; | |
47f46768 JA |
6012 | io_cqring_fill_event(req, ret); |
6013 | io_commit_cqring(ctx); | |
6014 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6015 | io_cqring_ev_posted(ctx); | |
6016 | ||
4e88d6e7 JA |
6017 | if (ret < 0) |
6018 | req_set_fail_links(req); | |
014db007 | 6019 | io_put_req(req); |
47f46768 JA |
6020 | } |
6021 | ||
3529d8c2 JA |
6022 | static int io_async_cancel_prep(struct io_kiocb *req, |
6023 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6024 | { |
fbf23849 | 6025 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6026 | return -EINVAL; |
61710e43 DA |
6027 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6028 | return -EINVAL; | |
6029 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
6030 | return -EINVAL; |
6031 | ||
fbf23849 JA |
6032 | req->cancel.addr = READ_ONCE(sqe->addr); |
6033 | return 0; | |
6034 | } | |
6035 | ||
61e98203 | 6036 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6037 | { |
6038 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 6039 | |
014db007 | 6040 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
6041 | return 0; |
6042 | } | |
6043 | ||
269bbe5f | 6044 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6045 | const struct io_uring_sqe *sqe) |
6046 | { | |
6ca56f84 JA |
6047 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
6048 | return -EINVAL; | |
61710e43 DA |
6049 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6050 | return -EINVAL; | |
6051 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
6052 | return -EINVAL; |
6053 | ||
269bbe5f BM |
6054 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6055 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6056 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6057 | return -EINVAL; |
269bbe5f | 6058 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6059 | return 0; |
6060 | } | |
6061 | ||
889fca73 | 6062 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6063 | { |
6064 | struct io_ring_ctx *ctx = req->ctx; | |
269bbe5f | 6065 | struct io_uring_rsrc_update up; |
05f3fb3c | 6066 | int ret; |
fbf23849 | 6067 | |
45d189c6 | 6068 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 6069 | return -EAGAIN; |
05f3fb3c | 6070 | |
269bbe5f BM |
6071 | up.offset = req->rsrc_update.offset; |
6072 | up.data = req->rsrc_update.arg; | |
05f3fb3c JA |
6073 | |
6074 | mutex_lock(&ctx->uring_lock); | |
269bbe5f | 6075 | ret = __io_sqe_files_update(ctx, &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
6076 | mutex_unlock(&ctx->uring_lock); |
6077 | ||
6078 | if (ret < 0) | |
6079 | req_set_fail_links(req); | |
889fca73 | 6080 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6081 | return 0; |
6082 | } | |
6083 | ||
bfe76559 | 6084 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6085 | { |
d625c6ee | 6086 | switch (req->opcode) { |
e781573e | 6087 | case IORING_OP_NOP: |
bfe76559 | 6088 | return 0; |
f67676d1 JA |
6089 | case IORING_OP_READV: |
6090 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6091 | case IORING_OP_READ: |
bfe76559 | 6092 | return io_read_prep(req, sqe); |
f67676d1 JA |
6093 | case IORING_OP_WRITEV: |
6094 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6095 | case IORING_OP_WRITE: |
bfe76559 | 6096 | return io_write_prep(req, sqe); |
0969e783 | 6097 | case IORING_OP_POLL_ADD: |
bfe76559 | 6098 | return io_poll_add_prep(req, sqe); |
0969e783 | 6099 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 6100 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 6101 | case IORING_OP_FSYNC: |
bfe76559 | 6102 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 6103 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 6104 | return io_prep_sfr(req, sqe); |
03b1230c | 6105 | case IORING_OP_SENDMSG: |
fddaface | 6106 | case IORING_OP_SEND: |
bfe76559 | 6107 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6108 | case IORING_OP_RECVMSG: |
fddaface | 6109 | case IORING_OP_RECV: |
bfe76559 | 6110 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6111 | case IORING_OP_CONNECT: |
bfe76559 | 6112 | return io_connect_prep(req, sqe); |
2d28390a | 6113 | case IORING_OP_TIMEOUT: |
bfe76559 | 6114 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6115 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6116 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6117 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6118 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6119 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6120 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6121 | case IORING_OP_ACCEPT: |
bfe76559 | 6122 | return io_accept_prep(req, sqe); |
d63d1b5e | 6123 | case IORING_OP_FALLOCATE: |
bfe76559 | 6124 | return io_fallocate_prep(req, sqe); |
15b71abe | 6125 | case IORING_OP_OPENAT: |
bfe76559 | 6126 | return io_openat_prep(req, sqe); |
b5dba59e | 6127 | case IORING_OP_CLOSE: |
bfe76559 | 6128 | return io_close_prep(req, sqe); |
05f3fb3c | 6129 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6130 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6131 | case IORING_OP_STATX: |
bfe76559 | 6132 | return io_statx_prep(req, sqe); |
4840e418 | 6133 | case IORING_OP_FADVISE: |
bfe76559 | 6134 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6135 | case IORING_OP_MADVISE: |
bfe76559 | 6136 | return io_madvise_prep(req, sqe); |
cebdb986 | 6137 | case IORING_OP_OPENAT2: |
bfe76559 | 6138 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6139 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6140 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6141 | case IORING_OP_SPLICE: |
bfe76559 | 6142 | return io_splice_prep(req, sqe); |
ddf0322d | 6143 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6144 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6145 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6146 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6147 | case IORING_OP_TEE: |
bfe76559 | 6148 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6149 | case IORING_OP_SHUTDOWN: |
6150 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6151 | case IORING_OP_RENAMEAT: |
6152 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6153 | case IORING_OP_UNLINKAT: |
6154 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
6155 | } |
6156 | ||
bfe76559 PB |
6157 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6158 | req->opcode); | |
6159 | return-EINVAL; | |
6160 | } | |
6161 | ||
6162 | static int io_req_defer_prep(struct io_kiocb *req, | |
6163 | const struct io_uring_sqe *sqe) | |
6164 | { | |
bfe76559 PB |
6165 | if (!sqe) |
6166 | return 0; | |
6167 | if (io_alloc_async_data(req)) | |
6168 | return -EAGAIN; | |
bfe76559 | 6169 | return io_req_prep(req, sqe); |
f67676d1 JA |
6170 | } |
6171 | ||
9cf7c104 PB |
6172 | static u32 io_get_sequence(struct io_kiocb *req) |
6173 | { | |
6174 | struct io_kiocb *pos; | |
6175 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 6176 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 6177 | |
f2f87370 PB |
6178 | io_for_each_link(pos, req) |
6179 | nr_reqs++; | |
9cf7c104 PB |
6180 | |
6181 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
6182 | return total_submitted - nr_reqs; | |
6183 | } | |
6184 | ||
3529d8c2 | 6185 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6186 | { |
a197f664 | 6187 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6188 | struct io_defer_entry *de; |
f67676d1 | 6189 | int ret; |
9cf7c104 | 6190 | u32 seq; |
de0617e4 | 6191 | |
9d858b21 | 6192 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6193 | if (likely(list_empty_careful(&ctx->defer_list) && |
6194 | !(req->flags & REQ_F_IO_DRAIN))) | |
6195 | return 0; | |
6196 | ||
6197 | seq = io_get_sequence(req); | |
6198 | /* Still a chance to pass the sequence check */ | |
6199 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6200 | return 0; |
6201 | ||
e8c2bc1f | 6202 | if (!req->async_data) { |
650b5481 | 6203 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6204 | if (ret) |
650b5481 PB |
6205 | return ret; |
6206 | } | |
cbdcb435 | 6207 | io_prep_async_link(req); |
27dc8338 PB |
6208 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6209 | if (!de) | |
6210 | return -ENOMEM; | |
2d28390a | 6211 | |
de0617e4 | 6212 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6213 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6214 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6215 | kfree(de); |
ae34817b PB |
6216 | io_queue_async_work(req); |
6217 | return -EIOCBQUEUED; | |
de0617e4 JA |
6218 | } |
6219 | ||
915967f6 | 6220 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6221 | de->req = req; |
9cf7c104 | 6222 | de->seq = seq; |
27dc8338 | 6223 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6224 | spin_unlock_irq(&ctx->completion_lock); |
6225 | return -EIOCBQUEUED; | |
6226 | } | |
6227 | ||
3ca405eb | 6228 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6229 | { |
0e1b6fe3 PB |
6230 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6231 | switch (req->opcode) { | |
6232 | case IORING_OP_READV: | |
6233 | case IORING_OP_READ_FIXED: | |
6234 | case IORING_OP_READ: | |
bcda7baa | 6235 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6236 | break; |
6237 | case IORING_OP_RECVMSG: | |
6238 | case IORING_OP_RECV: | |
bcda7baa | 6239 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6240 | break; |
6241 | } | |
6242 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6243 | } |
6244 | ||
0e1b6fe3 PB |
6245 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6246 | switch (req->opcode) { | |
6247 | case IORING_OP_READV: | |
6248 | case IORING_OP_READ_FIXED: | |
6249 | case IORING_OP_READ: | |
6250 | case IORING_OP_WRITEV: | |
6251 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6252 | case IORING_OP_WRITE: { |
6253 | struct io_async_rw *io = req->async_data; | |
6254 | if (io->free_iovec) | |
6255 | kfree(io->free_iovec); | |
0e1b6fe3 | 6256 | break; |
e8c2bc1f | 6257 | } |
0e1b6fe3 | 6258 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6259 | case IORING_OP_SENDMSG: { |
6260 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6261 | |
6262 | kfree(io->free_iov); | |
0e1b6fe3 | 6263 | break; |
e8c2bc1f | 6264 | } |
0e1b6fe3 PB |
6265 | case IORING_OP_SPLICE: |
6266 | case IORING_OP_TEE: | |
6267 | io_put_file(req, req->splice.file_in, | |
6268 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6269 | break; | |
f3cd4850 JA |
6270 | case IORING_OP_OPENAT: |
6271 | case IORING_OP_OPENAT2: | |
6272 | if (req->open.filename) | |
6273 | putname(req->open.filename); | |
6274 | break; | |
80a261fd JA |
6275 | case IORING_OP_RENAMEAT: |
6276 | putname(req->rename.oldpath); | |
6277 | putname(req->rename.newpath); | |
6278 | break; | |
14a1143b JA |
6279 | case IORING_OP_UNLINKAT: |
6280 | putname(req->unlink.filename); | |
6281 | break; | |
0e1b6fe3 PB |
6282 | } |
6283 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6284 | } |
99bc4c38 PB |
6285 | } |
6286 | ||
889fca73 | 6287 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6288 | { |
a197f664 | 6289 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6290 | int ret; |
2b188cc1 | 6291 | |
d625c6ee | 6292 | switch (req->opcode) { |
2b188cc1 | 6293 | case IORING_OP_NOP: |
889fca73 | 6294 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6295 | break; |
6296 | case IORING_OP_READV: | |
edafccee | 6297 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6298 | case IORING_OP_READ: |
889fca73 | 6299 | ret = io_read(req, issue_flags); |
edafccee | 6300 | break; |
3529d8c2 | 6301 | case IORING_OP_WRITEV: |
edafccee | 6302 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6303 | case IORING_OP_WRITE: |
889fca73 | 6304 | ret = io_write(req, issue_flags); |
2b188cc1 | 6305 | break; |
c992fe29 | 6306 | case IORING_OP_FSYNC: |
45d189c6 | 6307 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6308 | break; |
221c5eb2 | 6309 | case IORING_OP_POLL_ADD: |
61e98203 | 6310 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6311 | break; |
6312 | case IORING_OP_POLL_REMOVE: | |
61e98203 | 6313 | ret = io_poll_remove(req, issue_flags); |
221c5eb2 | 6314 | break; |
5d17b4a4 | 6315 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6316 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6317 | break; |
0fa03c62 | 6318 | case IORING_OP_SENDMSG: |
889fca73 | 6319 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6320 | break; |
fddaface | 6321 | case IORING_OP_SEND: |
889fca73 | 6322 | ret = io_send(req, issue_flags); |
0fa03c62 | 6323 | break; |
aa1fa28f | 6324 | case IORING_OP_RECVMSG: |
889fca73 | 6325 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6326 | break; |
fddaface | 6327 | case IORING_OP_RECV: |
889fca73 | 6328 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6329 | break; |
5262f567 | 6330 | case IORING_OP_TIMEOUT: |
61e98203 | 6331 | ret = io_timeout(req, issue_flags); |
5262f567 | 6332 | break; |
11365043 | 6333 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6334 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6335 | break; |
17f2fe35 | 6336 | case IORING_OP_ACCEPT: |
889fca73 | 6337 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6338 | break; |
f8e85cf2 | 6339 | case IORING_OP_CONNECT: |
889fca73 | 6340 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6341 | break; |
62755e35 | 6342 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6343 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6344 | break; |
d63d1b5e | 6345 | case IORING_OP_FALLOCATE: |
45d189c6 | 6346 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6347 | break; |
15b71abe | 6348 | case IORING_OP_OPENAT: |
45d189c6 | 6349 | ret = io_openat(req, issue_flags); |
15b71abe | 6350 | break; |
b5dba59e | 6351 | case IORING_OP_CLOSE: |
889fca73 | 6352 | ret = io_close(req, issue_flags); |
b5dba59e | 6353 | break; |
05f3fb3c | 6354 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6355 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6356 | break; |
eddc7ef5 | 6357 | case IORING_OP_STATX: |
45d189c6 | 6358 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6359 | break; |
4840e418 | 6360 | case IORING_OP_FADVISE: |
45d189c6 | 6361 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6362 | break; |
c1ca757b | 6363 | case IORING_OP_MADVISE: |
45d189c6 | 6364 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6365 | break; |
cebdb986 | 6366 | case IORING_OP_OPENAT2: |
45d189c6 | 6367 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6368 | break; |
3e4827b0 | 6369 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6370 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6371 | break; |
7d67af2c | 6372 | case IORING_OP_SPLICE: |
45d189c6 | 6373 | ret = io_splice(req, issue_flags); |
7d67af2c | 6374 | break; |
ddf0322d | 6375 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6376 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6377 | break; |
067524e9 | 6378 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6379 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6380 | break; |
f2a8d5c7 | 6381 | case IORING_OP_TEE: |
45d189c6 | 6382 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6383 | break; |
36f4fa68 | 6384 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6385 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6386 | break; |
80a261fd | 6387 | case IORING_OP_RENAMEAT: |
45d189c6 | 6388 | ret = io_renameat(req, issue_flags); |
80a261fd | 6389 | break; |
14a1143b | 6390 | case IORING_OP_UNLINKAT: |
45d189c6 | 6391 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6392 | break; |
2b188cc1 JA |
6393 | default: |
6394 | ret = -EINVAL; | |
6395 | break; | |
6396 | } | |
6397 | ||
def596e9 JA |
6398 | if (ret) |
6399 | return ret; | |
6400 | ||
b532576e JA |
6401 | /* If the op doesn't have a file, we're not polling for it */ |
6402 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6403 | const bool in_async = io_wq_current_is_worker(); |
6404 | ||
11ba820b JA |
6405 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6406 | if (in_async) | |
6407 | mutex_lock(&ctx->uring_lock); | |
6408 | ||
2e9dbe90 | 6409 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6410 | |
6411 | if (in_async) | |
6412 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6413 | } |
6414 | ||
6415 | return 0; | |
2b188cc1 JA |
6416 | } |
6417 | ||
5280f7e5 | 6418 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6419 | { |
6420 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6421 | struct io_kiocb *timeout; |
561fb04a | 6422 | int ret = 0; |
2b188cc1 | 6423 | |
6df1db6b PB |
6424 | timeout = io_prep_linked_timeout(req); |
6425 | if (timeout) | |
6426 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6427 | |
4014d943 | 6428 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6429 | ret = -ECANCELED; |
31b51510 | 6430 | |
561fb04a | 6431 | if (!ret) { |
561fb04a | 6432 | do { |
889fca73 | 6433 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6434 | /* |
6435 | * We can get EAGAIN for polled IO even though we're | |
6436 | * forcing a sync submission from here, since we can't | |
6437 | * wait for request slots on the block side. | |
6438 | */ | |
6439 | if (ret != -EAGAIN) | |
6440 | break; | |
6441 | cond_resched(); | |
6442 | } while (1); | |
6443 | } | |
31b51510 | 6444 | |
561fb04a | 6445 | if (ret) { |
c07e6719 XW |
6446 | struct io_ring_ctx *lock_ctx = NULL; |
6447 | ||
6448 | if (req->ctx->flags & IORING_SETUP_IOPOLL) | |
6449 | lock_ctx = req->ctx; | |
6450 | ||
dad1b124 | 6451 | /* |
c07e6719 XW |
6452 | * io_iopoll_complete() does not hold completion_lock to |
6453 | * complete polled io, so here for polled io, we can not call | |
6454 | * io_req_complete() directly, otherwise there maybe concurrent | |
6455 | * access to cqring, defer_list, etc, which is not safe. Given | |
6456 | * that io_iopoll_complete() is always called under uring_lock, | |
6457 | * so here for polled io, we also get uring_lock to complete | |
6458 | * it. | |
dad1b124 | 6459 | */ |
c07e6719 XW |
6460 | if (lock_ctx) |
6461 | mutex_lock(&lock_ctx->uring_lock); | |
dad1b124 | 6462 | |
c07e6719 XW |
6463 | req_set_fail_links(req); |
6464 | io_req_complete(req, ret); | |
6465 | ||
6466 | if (lock_ctx) | |
6467 | mutex_unlock(&lock_ctx->uring_lock); | |
edafccee | 6468 | } |
2b188cc1 JA |
6469 | } |
6470 | ||
65e19f54 JA |
6471 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6472 | int index) | |
6473 | { | |
269bbe5f | 6474 | struct fixed_rsrc_table *table; |
65e19f54 | 6475 | |
05f3fb3c | 6476 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6477 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6478 | } |
6479 | ||
8371adf5 PB |
6480 | static struct file *io_file_get(struct io_submit_state *state, |
6481 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6482 | { |
a197f664 | 6483 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6484 | struct file *file; |
09bb8394 | 6485 | |
8da11c19 | 6486 | if (fixed) { |
479f517b | 6487 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6488 | return NULL; |
b7620121 | 6489 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6490 | file = io_file_from_index(ctx, fd); |
36f72fe2 | 6491 | io_set_resource_node(req); |
09bb8394 | 6492 | } else { |
c826bd7a | 6493 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6494 | file = __io_file_get(state, fd); |
09bb8394 JA |
6495 | } |
6496 | ||
ce3d5aae PB |
6497 | if (file && unlikely(file->f_op == &io_uring_fops)) |
6498 | io_req_track_inflight(req); | |
8371adf5 | 6499 | return file; |
09bb8394 JA |
6500 | } |
6501 | ||
2665abfd | 6502 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6503 | { |
ad8a48ac JA |
6504 | struct io_timeout_data *data = container_of(timer, |
6505 | struct io_timeout_data, timer); | |
90cd7e42 | 6506 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6507 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6508 | unsigned long flags; |
2665abfd JA |
6509 | |
6510 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6511 | prev = req->timeout.head; |
6512 | req->timeout.head = NULL; | |
2665abfd JA |
6513 | |
6514 | /* | |
6515 | * We don't expect the list to be empty, that will only happen if we | |
6516 | * race with the completion of the linked work. | |
6517 | */ | |
90cd7e42 | 6518 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6519 | io_remove_next_linked(prev); |
90cd7e42 PB |
6520 | else |
6521 | prev = NULL; | |
2665abfd JA |
6522 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6523 | ||
6524 | if (prev) { | |
4e88d6e7 | 6525 | req_set_fail_links(prev); |
014db007 | 6526 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6527 | io_put_req_deferred(prev, 1); |
47f46768 | 6528 | } else { |
9ae1f8dd PB |
6529 | io_req_complete_post(req, -ETIME, 0); |
6530 | io_put_req_deferred(req, 1); | |
2665abfd | 6531 | } |
2665abfd JA |
6532 | return HRTIMER_NORESTART; |
6533 | } | |
6534 | ||
7271ef3a | 6535 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6536 | { |
76a46e06 | 6537 | /* |
f2f87370 PB |
6538 | * If the back reference is NULL, then our linked request finished |
6539 | * before we got a chance to setup the timer | |
76a46e06 | 6540 | */ |
90cd7e42 | 6541 | if (req->timeout.head) { |
e8c2bc1f | 6542 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6543 | |
ad8a48ac JA |
6544 | data->timer.function = io_link_timeout_fn; |
6545 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6546 | data->mode); | |
2665abfd | 6547 | } |
7271ef3a JA |
6548 | } |
6549 | ||
6550 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6551 | { | |
6552 | struct io_ring_ctx *ctx = req->ctx; | |
6553 | ||
6554 | spin_lock_irq(&ctx->completion_lock); | |
6555 | __io_queue_linked_timeout(req); | |
76a46e06 | 6556 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6557 | |
2665abfd | 6558 | /* drop submission reference */ |
76a46e06 JA |
6559 | io_put_req(req); |
6560 | } | |
2665abfd | 6561 | |
ad8a48ac | 6562 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6563 | { |
f2f87370 | 6564 | struct io_kiocb *nxt = req->link; |
2665abfd | 6565 | |
f2f87370 PB |
6566 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6567 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6568 | return NULL; |
2665abfd | 6569 | |
90cd7e42 | 6570 | nxt->timeout.head = req; |
900fad45 | 6571 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6572 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6573 | return nxt; |
2665abfd JA |
6574 | } |
6575 | ||
c5eef2b9 | 6576 | static void __io_queue_sqe(struct io_kiocb *req) |
2b188cc1 | 6577 | { |
4a0a7a18 | 6578 | struct io_kiocb *linked_timeout; |
193155c8 | 6579 | const struct cred *old_creds = NULL; |
c5eef2b9 | 6580 | int ret; |
2b188cc1 | 6581 | |
4a0a7a18 JA |
6582 | again: |
6583 | linked_timeout = io_prep_linked_timeout(req); | |
6584 | ||
2e5aa6cb PB |
6585 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6586 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6587 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6588 | if (old_creds) |
6589 | revert_creds(old_creds); | |
98447d65 | 6590 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6591 | old_creds = NULL; /* restored original creds */ |
6592 | else | |
98447d65 | 6593 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6594 | } |
6595 | ||
c5eef2b9 | 6596 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
491381ce JA |
6597 | |
6598 | /* | |
6599 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6600 | * doesn't support non-blocking read/write attempts | |
6601 | */ | |
24c74678 | 6602 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6603 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6604 | /* |
6605 | * Queued up for async execution, worker will release | |
6606 | * submit reference when the iocb is actually submitted. | |
6607 | */ | |
6608 | io_queue_async_work(req); | |
2b188cc1 | 6609 | } |
bbad27b2 | 6610 | |
f063c547 PB |
6611 | if (linked_timeout) |
6612 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6613 | } else if (likely(!ret)) { |
6614 | /* drop submission reference */ | |
e342c807 | 6615 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6616 | struct io_ring_ctx *ctx = req->ctx; |
6617 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
6618 | ||
6dd0be1e PB |
6619 | cs->reqs[cs->nr++] = req; |
6620 | if (cs->nr == IO_COMPL_BATCH) | |
c5eef2b9 | 6621 | io_submit_flush_completions(cs, ctx); |
9affd664 PB |
6622 | req = NULL; |
6623 | } else { | |
6624 | req = io_put_req_find_next(req); | |
6625 | } | |
6626 | ||
0d63c148 PB |
6627 | if (linked_timeout) |
6628 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6629 | |
0d63c148 PB |
6630 | if (req) { |
6631 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6632 | goto again; | |
6633 | io_queue_async_work(req); | |
6634 | } | |
6635 | } else { | |
652532ad PB |
6636 | /* un-prep timeout, so it'll be killed as any other linked */ |
6637 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6638 | req_set_fail_links(req); |
e65ef56d | 6639 | io_put_req(req); |
e1e16097 | 6640 | io_req_complete(req, ret); |
9e645e11 | 6641 | } |
652532ad | 6642 | |
193155c8 JA |
6643 | if (old_creds) |
6644 | revert_creds(old_creds); | |
2b188cc1 JA |
6645 | } |
6646 | ||
c5eef2b9 | 6647 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
6648 | { |
6649 | int ret; | |
6650 | ||
3529d8c2 | 6651 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6652 | if (ret) { |
6653 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6654 | fail_req: |
4e88d6e7 | 6655 | req_set_fail_links(req); |
e1e16097 JA |
6656 | io_put_req(req); |
6657 | io_req_complete(req, ret); | |
4fe2c963 | 6658 | } |
2550878f | 6659 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6660 | if (!req->async_data) { |
bd2ab18a | 6661 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6662 | if (unlikely(ret)) |
bd2ab18a PB |
6663 | goto fail_req; |
6664 | } | |
ce35a47a JA |
6665 | io_queue_async_work(req); |
6666 | } else { | |
c1379e24 PB |
6667 | if (sqe) { |
6668 | ret = io_req_prep(req, sqe); | |
6669 | if (unlikely(ret)) | |
6670 | goto fail_req; | |
6671 | } | |
c5eef2b9 | 6672 | __io_queue_sqe(req); |
ce35a47a | 6673 | } |
4fe2c963 JL |
6674 | } |
6675 | ||
c5eef2b9 | 6676 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 6677 | { |
94ae5e77 | 6678 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6679 | io_put_req(req); |
6680 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6681 | } else |
c5eef2b9 | 6682 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
6683 | } |
6684 | ||
863e0560 PB |
6685 | struct io_submit_link { |
6686 | struct io_kiocb *head; | |
6687 | struct io_kiocb *last; | |
6688 | }; | |
6689 | ||
1d4240cc | 6690 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
c5eef2b9 | 6691 | struct io_submit_link *link) |
9e645e11 | 6692 | { |
a197f664 | 6693 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6694 | int ret; |
9e645e11 | 6695 | |
9e645e11 JA |
6696 | /* |
6697 | * If we already have a head request, queue this one for async | |
6698 | * submittal once the head completes. If we don't have a head but | |
6699 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6700 | * submitted sync once the chain is complete. If none of those | |
6701 | * conditions are true (normal request), then just queue it. | |
6702 | */ | |
863e0560 PB |
6703 | if (link->head) { |
6704 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6705 | |
8cdf2193 PB |
6706 | /* |
6707 | * Taking sequential execution of a link, draining both sides | |
6708 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6709 | * requests in the link. So, it drains the head and the | |
6710 | * next after the link request. The last one is done via | |
6711 | * drain_next flag to persist the effect across calls. | |
6712 | */ | |
ef4ff581 | 6713 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6714 | head->flags |= REQ_F_IO_DRAIN; |
6715 | ctx->drain_next = 1; | |
6716 | } | |
3529d8c2 | 6717 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6718 | if (unlikely(ret)) { |
4e88d6e7 | 6719 | /* fail even hard links since we don't submit */ |
9d76377f | 6720 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6721 | return ret; |
2d28390a | 6722 | } |
9d76377f | 6723 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6724 | link->last->link = req; |
863e0560 | 6725 | link->last = req; |
32fe525b PB |
6726 | |
6727 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6728 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
c5eef2b9 | 6729 | io_queue_link_head(head); |
863e0560 | 6730 | link->head = NULL; |
32fe525b | 6731 | } |
9e645e11 | 6732 | } else { |
711be031 PB |
6733 | if (unlikely(ctx->drain_next)) { |
6734 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6735 | ctx->drain_next = 0; |
711be031 | 6736 | } |
ef4ff581 | 6737 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6738 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6739 | if (unlikely(ret)) |
711be031 | 6740 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6741 | link->head = req; |
6742 | link->last = req; | |
711be031 | 6743 | } else { |
c5eef2b9 | 6744 | io_queue_sqe(req, sqe); |
711be031 | 6745 | } |
9e645e11 | 6746 | } |
2e6e1fde | 6747 | |
1d4240cc | 6748 | return 0; |
9e645e11 JA |
6749 | } |
6750 | ||
9a56a232 JA |
6751 | /* |
6752 | * Batched submission is done, ensure local IO is flushed out. | |
6753 | */ | |
ba88ff11 PB |
6754 | static void io_submit_state_end(struct io_submit_state *state, |
6755 | struct io_ring_ctx *ctx) | |
9a56a232 | 6756 | { |
6dd0be1e | 6757 | if (state->comp.nr) |
ba88ff11 | 6758 | io_submit_flush_completions(&state->comp, ctx); |
27926b68 JA |
6759 | if (state->plug_started) |
6760 | blk_finish_plug(&state->plug); | |
9f13c35b | 6761 | io_state_file_put(state); |
9a56a232 JA |
6762 | } |
6763 | ||
6764 | /* | |
6765 | * Start submission side cache. | |
6766 | */ | |
6767 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6768 | unsigned int max_ios) |
9a56a232 | 6769 | { |
27926b68 | 6770 | state->plug_started = false; |
9a56a232 JA |
6771 | state->ios_left = max_ios; |
6772 | } | |
6773 | ||
2b188cc1 JA |
6774 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6775 | { | |
75b28aff | 6776 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6777 | |
caf582c6 PB |
6778 | /* |
6779 | * Ensure any loads from the SQEs are done at this point, | |
6780 | * since once we write the new head, the application could | |
6781 | * write new data to them. | |
6782 | */ | |
6783 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6784 | } |
6785 | ||
2b188cc1 | 6786 | /* |
3529d8c2 | 6787 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6788 | * that is mapped by userspace. This means that care needs to be taken to |
6789 | * ensure that reads are stable, as we cannot rely on userspace always | |
6790 | * being a good citizen. If members of the sqe are validated and then later | |
6791 | * used, it's important that those reads are done through READ_ONCE() to | |
6792 | * prevent a re-load down the line. | |
6793 | */ | |
709b302f | 6794 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6795 | { |
75b28aff | 6796 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6797 | unsigned head; |
6798 | ||
6799 | /* | |
6800 | * The cached sq head (or cq tail) serves two purposes: | |
6801 | * | |
6802 | * 1) allows us to batch the cost of updating the user visible | |
6803 | * head updates. | |
6804 | * 2) allows the kernel side to track the head on its own, even | |
6805 | * though the application is the one updating it. | |
6806 | */ | |
ee7d46d9 | 6807 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6808 | if (likely(head < ctx->sq_entries)) |
6809 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6810 | |
6811 | /* drop invalid entries */ | |
498ccd9e | 6812 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6813 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6814 | return NULL; |
6815 | } | |
6816 | ||
6817 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6818 | { | |
6819 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6820 | } |
6821 | ||
21b55dbc SG |
6822 | /* |
6823 | * Check SQE restrictions (opcode and flags). | |
6824 | * | |
6825 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6826 | */ | |
6827 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6828 | struct io_kiocb *req, | |
6829 | unsigned int sqe_flags) | |
6830 | { | |
6831 | if (!ctx->restricted) | |
6832 | return true; | |
6833 | ||
6834 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6835 | return false; | |
6836 | ||
6837 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6838 | ctx->restrictions.sqe_flags_required) | |
6839 | return false; | |
6840 | ||
6841 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6842 | ctx->restrictions.sqe_flags_required)) | |
6843 | return false; | |
6844 | ||
6845 | return true; | |
6846 | } | |
6847 | ||
ef4ff581 PB |
6848 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6849 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6850 | IOSQE_BUFFER_SELECT) | |
6851 | ||
6852 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
258b29a9 | 6853 | const struct io_uring_sqe *sqe) |
0553b8bd | 6854 | { |
258b29a9 | 6855 | struct io_submit_state *state; |
ef4ff581 | 6856 | unsigned int sqe_flags; |
71b547c0 | 6857 | int id, ret; |
ef4ff581 | 6858 | |
0553b8bd PB |
6859 | req->opcode = READ_ONCE(sqe->opcode); |
6860 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6861 | req->async_data = NULL; |
0553b8bd PB |
6862 | req->file = NULL; |
6863 | req->ctx = ctx; | |
6864 | req->flags = 0; | |
f2f87370 | 6865 | req->link = NULL; |
269bbe5f | 6866 | req->fixed_rsrc_refs = NULL; |
0553b8bd PB |
6867 | /* one is dropped after submission, the other at completion */ |
6868 | refcount_set(&req->refs, 2); | |
4dd2824d | 6869 | req->task = current; |
0553b8bd | 6870 | req->result = 0; |
ef4ff581 PB |
6871 | |
6872 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6873 | return -EINVAL; | |
6874 | ||
28cea78a | 6875 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6876 | return -EFAULT; |
ef4ff581 PB |
6877 | |
6878 | sqe_flags = READ_ONCE(sqe->flags); | |
6879 | /* enforce forwards compatibility on users */ | |
6880 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6881 | return -EINVAL; | |
6882 | ||
21b55dbc SG |
6883 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6884 | return -EACCES; | |
6885 | ||
ef4ff581 PB |
6886 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6887 | !io_op_defs[req->opcode].buffer_select) | |
6888 | return -EOPNOTSUPP; | |
6889 | ||
6890 | id = READ_ONCE(sqe->personality); | |
6891 | if (id) { | |
1e6fa521 JA |
6892 | struct io_identity *iod; |
6893 | ||
1e6fa521 JA |
6894 | iod = idr_find(&ctx->personality_idr, id); |
6895 | if (unlikely(!iod)) | |
ef4ff581 | 6896 | return -EINVAL; |
1e6fa521 | 6897 | refcount_inc(&iod->count); |
ec99ca6c PB |
6898 | |
6899 | __io_req_init_async(req); | |
1e6fa521 JA |
6900 | get_cred(iod->creds); |
6901 | req->work.identity = iod; | |
dfead8a8 | 6902 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6903 | } |
6904 | ||
6905 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6906 | req->flags |= sqe_flags; |
258b29a9 | 6907 | state = &ctx->submit_state; |
ef4ff581 | 6908 | |
27926b68 JA |
6909 | /* |
6910 | * Plug now if we have more than 1 IO left after this, and the target | |
6911 | * is potentially a read/write to block based storage. | |
6912 | */ | |
6913 | if (!state->plug_started && state->ios_left > 1 && | |
6914 | io_op_defs[req->opcode].plug) { | |
6915 | blk_start_plug(&state->plug); | |
6916 | state->plug_started = true; | |
6917 | } | |
6918 | ||
bd5bbda7 PB |
6919 | ret = 0; |
6920 | if (io_op_defs[req->opcode].needs_file) { | |
6921 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6922 | ||
6923 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
ba13e23f | 6924 | if (unlikely(!req->file)) |
bd5bbda7 PB |
6925 | ret = -EBADF; |
6926 | } | |
63ff8223 | 6927 | |
71b547c0 PB |
6928 | state->ios_left--; |
6929 | return ret; | |
0553b8bd PB |
6930 | } |
6931 | ||
0f212204 | 6932 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6933 | { |
863e0560 | 6934 | struct io_submit_link link; |
9e645e11 | 6935 | int i, submitted = 0; |
6c271ce2 | 6936 | |
c4a2ed72 | 6937 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 | 6938 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6c503150 | 6939 | if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6940 | return -EBUSY; |
6941 | } | |
6c271ce2 | 6942 | |
ee7d46d9 PB |
6943 | /* make sure SQ entry isn't read before tail */ |
6944 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6945 | |
2b85edfc PB |
6946 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6947 | return -EAGAIN; | |
6c271ce2 | 6948 | |
d8a6df10 | 6949 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6950 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6951 | |
ba88ff11 | 6952 | io_submit_state_start(&ctx->submit_state, nr); |
863e0560 | 6953 | link.head = NULL; |
b14cca0c | 6954 | |
6c271ce2 | 6955 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6956 | const struct io_uring_sqe *sqe; |
196be95c | 6957 | struct io_kiocb *req; |
1cb1edb2 | 6958 | int err; |
fb5ccc98 | 6959 | |
b1e50e54 PB |
6960 | sqe = io_get_sqe(ctx); |
6961 | if (unlikely(!sqe)) { | |
6962 | io_consume_sqe(ctx); | |
6963 | break; | |
6964 | } | |
258b29a9 | 6965 | req = io_alloc_req(ctx); |
196be95c PB |
6966 | if (unlikely(!req)) { |
6967 | if (!submitted) | |
6968 | submitted = -EAGAIN; | |
fb5ccc98 | 6969 | break; |
196be95c | 6970 | } |
709b302f | 6971 | io_consume_sqe(ctx); |
d3656344 JA |
6972 | /* will complete beyond this point, count as submitted */ |
6973 | submitted++; | |
6974 | ||
258b29a9 | 6975 | err = io_init_req(ctx, req, sqe); |
ef4ff581 | 6976 | if (unlikely(err)) { |
1cb1edb2 | 6977 | fail_req: |
e1e16097 JA |
6978 | io_put_req(req); |
6979 | io_req_complete(req, err); | |
196be95c PB |
6980 | break; |
6981 | } | |
fb5ccc98 | 6982 | |
354420f7 | 6983 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
2d7e9358 | 6984 | true, ctx->flags & IORING_SETUP_SQPOLL); |
c5eef2b9 | 6985 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
6986 | if (err) |
6987 | goto fail_req; | |
6c271ce2 JA |
6988 | } |
6989 | ||
9466f437 PB |
6990 | if (unlikely(submitted != nr)) { |
6991 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6992 | struct io_uring_task *tctx = current->io_uring; |
6993 | int unused = nr - ref_used; | |
9466f437 | 6994 | |
d8a6df10 JA |
6995 | percpu_ref_put_many(&ctx->refs, unused); |
6996 | percpu_counter_sub(&tctx->inflight, unused); | |
6997 | put_task_struct_many(current, unused); | |
9466f437 | 6998 | } |
863e0560 | 6999 | if (link.head) |
c5eef2b9 | 7000 | io_queue_link_head(link.head); |
ba88ff11 | 7001 | io_submit_state_end(&ctx->submit_state, ctx); |
6c271ce2 | 7002 | |
ae9428ca PB |
7003 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7004 | io_commit_sqring(ctx); | |
7005 | ||
6c271ce2 JA |
7006 | return submitted; |
7007 | } | |
7008 | ||
23b3628e XW |
7009 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7010 | { | |
7011 | /* Tell userspace we may need a wakeup call */ | |
7012 | spin_lock_irq(&ctx->completion_lock); | |
7013 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
7014 | spin_unlock_irq(&ctx->completion_lock); | |
7015 | } | |
7016 | ||
7017 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7018 | { | |
7019 | spin_lock_irq(&ctx->completion_lock); | |
7020 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
7021 | spin_unlock_irq(&ctx->completion_lock); | |
7022 | } | |
7023 | ||
08369246 | 7024 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7025 | { |
c8d1ba58 | 7026 | unsigned int to_submit; |
bdcd3eab | 7027 | int ret = 0; |
6c271ce2 | 7028 | |
c8d1ba58 | 7029 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
7030 | /* if we're handling multiple rings, cap submit size for fairness */ |
7031 | if (cap_entries && to_submit > 8) | |
7032 | to_submit = 8; | |
7033 | ||
906a3c6f | 7034 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7035 | unsigned nr_events = 0; |
a4c0b3de | 7036 | |
c8d1ba58 | 7037 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7038 | if (!list_empty(&ctx->iopoll_list)) |
c8d1ba58 | 7039 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7040 | |
d9d05217 PB |
7041 | if (to_submit && !ctx->sqo_dead && |
7042 | likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 | 7043 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 JA |
7044 | mutex_unlock(&ctx->uring_lock); |
7045 | } | |
6c271ce2 | 7046 | |
90554200 JA |
7047 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7048 | wake_up(&ctx->sqo_sq_wait); | |
6c271ce2 | 7049 | |
08369246 XW |
7050 | return ret; |
7051 | } | |
6c271ce2 | 7052 | |
08369246 XW |
7053 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7054 | { | |
7055 | struct io_ring_ctx *ctx; | |
7056 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7057 | |
08369246 XW |
7058 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7059 | if (sq_thread_idle < ctx->sq_thread_idle) | |
7060 | sq_thread_idle = ctx->sq_thread_idle; | |
c8d1ba58 | 7061 | } |
c1edbf5f | 7062 | |
08369246 | 7063 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7064 | } |
6c271ce2 | 7065 | |
69fb2131 JA |
7066 | static void io_sqd_init_new(struct io_sq_data *sqd) |
7067 | { | |
7068 | struct io_ring_ctx *ctx; | |
7069 | ||
7070 | while (!list_empty(&sqd->ctx_new_list)) { | |
7071 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
7072 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
7073 | complete(&ctx->sq_thread_comp); | |
7074 | } | |
08369246 XW |
7075 | |
7076 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
7077 | } |
7078 | ||
c8d1ba58 JA |
7079 | static int io_sq_thread(void *data) |
7080 | { | |
91d8f519 | 7081 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
7082 | struct files_struct *old_files = current->files; |
7083 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
7084 | const struct cred *old_cred = NULL; |
7085 | struct io_sq_data *sqd = data; | |
7086 | struct io_ring_ctx *ctx; | |
a0d9205f | 7087 | unsigned long timeout = 0; |
08369246 | 7088 | DEFINE_WAIT(wait); |
6c271ce2 | 7089 | |
28cea78a JA |
7090 | task_lock(current); |
7091 | current->files = NULL; | |
7092 | current->nsproxy = NULL; | |
7093 | task_unlock(current); | |
6c271ce2 | 7094 | |
69fb2131 | 7095 | while (!kthread_should_stop()) { |
08369246 XW |
7096 | int ret; |
7097 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
7098 | |
7099 | /* | |
69fb2131 JA |
7100 | * Any changes to the sqd lists are synchronized through the |
7101 | * kthread parking. This synchronizes the thread vs users, | |
7102 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 7103 | */ |
65b2b213 | 7104 | if (kthread_should_park()) { |
69fb2131 | 7105 | kthread_parkme(); |
65b2b213 XW |
7106 | /* |
7107 | * When sq thread is unparked, in case the previous park operation | |
7108 | * comes from io_put_sq_data(), which means that sq thread is going | |
7109 | * to be stopped, so here needs to have a check. | |
7110 | */ | |
7111 | if (kthread_should_stop()) | |
7112 | break; | |
7113 | } | |
7143b5ac | 7114 | |
08369246 | 7115 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 7116 | io_sqd_init_new(sqd); |
08369246 XW |
7117 | timeout = jiffies + sqd->sq_thread_idle; |
7118 | } | |
6c271ce2 | 7119 | |
08369246 | 7120 | sqt_spin = false; |
e95eee2d | 7121 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
7122 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7123 | if (current->cred != ctx->creds) { | |
7124 | if (old_cred) | |
7125 | revert_creds(old_cred); | |
7126 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7127 | } |
91d8f519 | 7128 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7129 | #ifdef CONFIG_AUDIT |
7130 | current->loginuid = ctx->loginuid; | |
7131 | current->sessionid = ctx->sessionid; | |
7132 | #endif | |
bdcd3eab | 7133 | |
08369246 XW |
7134 | ret = __io_sq_thread(ctx, cap_entries); |
7135 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
7136 | sqt_spin = true; | |
6c271ce2 | 7137 | |
28cea78a | 7138 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7139 | } |
6c271ce2 | 7140 | |
08369246 | 7141 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7142 | io_run_task_work(); |
d434ab6d | 7143 | io_sq_thread_drop_mm_files(); |
c8d1ba58 | 7144 | cond_resched(); |
08369246 XW |
7145 | if (sqt_spin) |
7146 | timeout = jiffies + sqd->sq_thread_idle; | |
7147 | continue; | |
7148 | } | |
7149 | ||
08369246 XW |
7150 | needs_sched = true; |
7151 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
7152 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
7153 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
7154 | !list_empty_careful(&ctx->iopoll_list)) { | |
7155 | needs_sched = false; | |
7156 | break; | |
7157 | } | |
7158 | if (io_sqring_entries(ctx)) { | |
7159 | needs_sched = false; | |
7160 | break; | |
7161 | } | |
7162 | } | |
7163 | ||
8b28fdf2 | 7164 | if (needs_sched && !kthread_should_park()) { |
69fb2131 JA |
7165 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7166 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 7167 | |
69fb2131 | 7168 | schedule(); |
69fb2131 JA |
7169 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7170 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7171 | } |
08369246 XW |
7172 | |
7173 | finish_wait(&sqd->wait, &wait); | |
7174 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
7175 | } |
7176 | ||
4c6e277c | 7177 | io_run_task_work(); |
d434ab6d | 7178 | io_sq_thread_drop_mm_files(); |
b41e9852 | 7179 | |
91d8f519 DZ |
7180 | if (cur_css) |
7181 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7182 | if (old_cred) |
7183 | revert_creds(old_cred); | |
06058632 | 7184 | |
28cea78a JA |
7185 | task_lock(current); |
7186 | current->files = old_files; | |
7187 | current->nsproxy = old_nsproxy; | |
7188 | task_unlock(current); | |
7189 | ||
2bbcd6d3 | 7190 | kthread_parkme(); |
06058632 | 7191 | |
6c271ce2 JA |
7192 | return 0; |
7193 | } | |
7194 | ||
bda52162 JA |
7195 | struct io_wait_queue { |
7196 | struct wait_queue_entry wq; | |
7197 | struct io_ring_ctx *ctx; | |
7198 | unsigned to_wait; | |
7199 | unsigned nr_timeouts; | |
7200 | }; | |
7201 | ||
6c503150 | 7202 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7203 | { |
7204 | struct io_ring_ctx *ctx = iowq->ctx; | |
7205 | ||
7206 | /* | |
d195a66e | 7207 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7208 | * started waiting. For timeouts, we always want to return to userspace, |
7209 | * regardless of event count. | |
7210 | */ | |
6c503150 | 7211 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
7212 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7213 | } | |
7214 | ||
7215 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7216 | int wake_flags, void *key) | |
7217 | { | |
7218 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7219 | wq); | |
7220 | ||
6c503150 PB |
7221 | /* |
7222 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7223 | * the task, and the next invocation will do it. | |
7224 | */ | |
7225 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow)) | |
7226 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7227 | return -1; | |
bda52162 JA |
7228 | } |
7229 | ||
af9c1a44 JA |
7230 | static int io_run_task_work_sig(void) |
7231 | { | |
7232 | if (io_run_task_work()) | |
7233 | return 1; | |
7234 | if (!signal_pending(current)) | |
7235 | return 0; | |
792ee0f6 JA |
7236 | if (test_tsk_thread_flag(current, TIF_NOTIFY_SIGNAL)) |
7237 | return -ERESTARTSYS; | |
af9c1a44 JA |
7238 | return -EINTR; |
7239 | } | |
7240 | ||
eeb60b9a PB |
7241 | /* when returns >0, the caller should retry */ |
7242 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7243 | struct io_wait_queue *iowq, | |
7244 | signed long *timeout) | |
7245 | { | |
7246 | int ret; | |
7247 | ||
7248 | /* make sure we run task_work before checking for signals */ | |
7249 | ret = io_run_task_work_sig(); | |
7250 | if (ret || io_should_wake(iowq)) | |
7251 | return ret; | |
7252 | /* let the caller flush overflows, retry */ | |
7253 | if (test_bit(0, &ctx->cq_check_overflow)) | |
7254 | return 1; | |
7255 | ||
7256 | *timeout = schedule_timeout(*timeout); | |
7257 | return !*timeout ? -ETIME : 1; | |
7258 | } | |
7259 | ||
2b188cc1 JA |
7260 | /* |
7261 | * Wait until events become available, if we don't already have some. The | |
7262 | * application must reap them itself, as they reside on the shared cq ring. | |
7263 | */ | |
7264 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7265 | const sigset_t __user *sig, size_t sigsz, |
7266 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7267 | { |
bda52162 JA |
7268 | struct io_wait_queue iowq = { |
7269 | .wq = { | |
7270 | .private = current, | |
7271 | .func = io_wake_function, | |
7272 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7273 | }, | |
7274 | .ctx = ctx, | |
7275 | .to_wait = min_events, | |
7276 | }; | |
75b28aff | 7277 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7278 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7279 | int ret; | |
2b188cc1 | 7280 | |
b41e9852 | 7281 | do { |
6c503150 PB |
7282 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
7283 | if (io_cqring_events(ctx) >= min_events) | |
b41e9852 | 7284 | return 0; |
4c6e277c | 7285 | if (!io_run_task_work()) |
b41e9852 | 7286 | break; |
b41e9852 | 7287 | } while (1); |
2b188cc1 JA |
7288 | |
7289 | if (sig) { | |
9e75ad5d AB |
7290 | #ifdef CONFIG_COMPAT |
7291 | if (in_compat_syscall()) | |
7292 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7293 | sigsz); |
9e75ad5d AB |
7294 | else |
7295 | #endif | |
b772434b | 7296 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7297 | |
2b188cc1 JA |
7298 | if (ret) |
7299 | return ret; | |
7300 | } | |
7301 | ||
c73ebb68 | 7302 | if (uts) { |
c1d5a224 PB |
7303 | struct timespec64 ts; |
7304 | ||
c73ebb68 HX |
7305 | if (get_timespec64(&ts, uts)) |
7306 | return -EFAULT; | |
7307 | timeout = timespec64_to_jiffies(&ts); | |
7308 | } | |
7309 | ||
bda52162 | 7310 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7311 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7312 | do { |
6c503150 | 7313 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
bda52162 JA |
7314 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, |
7315 | TASK_INTERRUPTIBLE); | |
eeb60b9a PB |
7316 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
7317 | finish_wait(&ctx->wait, &iowq.wq); | |
7318 | } while (ret > 0); | |
bda52162 | 7319 | |
b7db41c9 | 7320 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7321 | |
75b28aff | 7322 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7323 | } |
7324 | ||
6b06314c JA |
7325 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7326 | { | |
7327 | #if defined(CONFIG_UNIX) | |
7328 | if (ctx->ring_sock) { | |
7329 | struct sock *sock = ctx->ring_sock->sk; | |
7330 | struct sk_buff *skb; | |
7331 | ||
7332 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7333 | kfree_skb(skb); | |
7334 | } | |
7335 | #else | |
7336 | int i; | |
7337 | ||
65e19f54 JA |
7338 | for (i = 0; i < ctx->nr_user_files; i++) { |
7339 | struct file *file; | |
7340 | ||
7341 | file = io_file_from_index(ctx, i); | |
7342 | if (file) | |
7343 | fput(file); | |
7344 | } | |
6b06314c JA |
7345 | #endif |
7346 | } | |
7347 | ||
00835dce | 7348 | static void io_rsrc_data_ref_zero(struct percpu_ref *ref) |
05f3fb3c | 7349 | { |
269bbe5f | 7350 | struct fixed_rsrc_data *data; |
05f3fb3c | 7351 | |
269bbe5f | 7352 | data = container_of(ref, struct fixed_rsrc_data, refs); |
05f3fb3c JA |
7353 | complete(&data->done); |
7354 | } | |
7355 | ||
2a63b2d9 BM |
7356 | static inline void io_rsrc_ref_lock(struct io_ring_ctx *ctx) |
7357 | { | |
7358 | spin_lock_bh(&ctx->rsrc_ref_lock); | |
7359 | } | |
7360 | ||
7361 | static inline void io_rsrc_ref_unlock(struct io_ring_ctx *ctx) | |
7362 | { | |
7363 | spin_unlock_bh(&ctx->rsrc_ref_lock); | |
7364 | } | |
7365 | ||
d67d2263 BM |
7366 | static void io_sqe_rsrc_set_node(struct io_ring_ctx *ctx, |
7367 | struct fixed_rsrc_data *rsrc_data, | |
269bbe5f | 7368 | struct fixed_rsrc_ref_node *ref_node) |
1642b445 | 7369 | { |
2a63b2d9 | 7370 | io_rsrc_ref_lock(ctx); |
269bbe5f | 7371 | rsrc_data->node = ref_node; |
d67d2263 | 7372 | list_add_tail(&ref_node->node, &ctx->rsrc_ref_list); |
2a63b2d9 | 7373 | io_rsrc_ref_unlock(ctx); |
269bbe5f | 7374 | percpu_ref_get(&rsrc_data->refs); |
1642b445 PB |
7375 | } |
7376 | ||
d7954b2b BM |
7377 | static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data, |
7378 | struct io_ring_ctx *ctx, | |
7379 | struct fixed_rsrc_ref_node *backup_node) | |
6b06314c | 7380 | { |
d7954b2b | 7381 | struct fixed_rsrc_ref_node *ref_node; |
1ffc5422 | 7382 | int ret; |
65e19f54 | 7383 | |
2a63b2d9 | 7384 | io_rsrc_ref_lock(ctx); |
1e5d770b | 7385 | ref_node = data->node; |
2a63b2d9 | 7386 | io_rsrc_ref_unlock(ctx); |
05589553 XW |
7387 | if (ref_node) |
7388 | percpu_ref_kill(&ref_node->refs); | |
7389 | ||
7390 | percpu_ref_kill(&data->refs); | |
7391 | ||
7392 | /* wait for all refs nodes to complete */ | |
269bbe5f | 7393 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 PB |
7394 | do { |
7395 | ret = wait_for_completion_interruptible(&data->done); | |
7396 | if (!ret) | |
7397 | break; | |
7398 | ret = io_run_task_work_sig(); | |
7399 | if (ret < 0) { | |
7400 | percpu_ref_resurrect(&data->refs); | |
7401 | reinit_completion(&data->done); | |
d67d2263 | 7402 | io_sqe_rsrc_set_node(ctx, data, backup_node); |
1ffc5422 PB |
7403 | return ret; |
7404 | } | |
7405 | } while (1); | |
05f3fb3c | 7406 | |
d7954b2b BM |
7407 | destroy_fixed_rsrc_ref_node(backup_node); |
7408 | return 0; | |
7409 | } | |
7410 | ||
1ad555c6 BM |
7411 | static struct fixed_rsrc_data *alloc_fixed_rsrc_data(struct io_ring_ctx *ctx) |
7412 | { | |
7413 | struct fixed_rsrc_data *data; | |
7414 | ||
7415 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7416 | if (!data) | |
7417 | return NULL; | |
7418 | ||
00835dce | 7419 | if (percpu_ref_init(&data->refs, io_rsrc_data_ref_zero, |
1ad555c6 BM |
7420 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7421 | kfree(data); | |
7422 | return NULL; | |
7423 | } | |
7424 | data->ctx = ctx; | |
7425 | init_completion(&data->done); | |
7426 | return data; | |
7427 | } | |
7428 | ||
7429 | static void free_fixed_rsrc_data(struct fixed_rsrc_data *data) | |
7430 | { | |
7431 | percpu_ref_exit(&data->refs); | |
7432 | kfree(data->table); | |
7433 | kfree(data); | |
7434 | } | |
7435 | ||
d7954b2b BM |
7436 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7437 | { | |
7438 | struct fixed_rsrc_data *data = ctx->file_data; | |
7439 | struct fixed_rsrc_ref_node *backup_node; | |
7440 | unsigned nr_tables, i; | |
7441 | int ret; | |
7442 | ||
7443 | if (!data) | |
7444 | return -ENXIO; | |
7445 | backup_node = alloc_fixed_rsrc_ref_node(ctx); | |
7446 | if (!backup_node) | |
7447 | return -ENOMEM; | |
7448 | init_fixed_file_ref_node(ctx, backup_node); | |
7449 | ||
7450 | ret = io_rsrc_ref_quiesce(data, ctx, backup_node); | |
7451 | if (ret) | |
7452 | return ret; | |
7453 | ||
6b06314c | 7454 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7455 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7456 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7457 | kfree(data->table[i].files); |
1ad555c6 | 7458 | free_fixed_rsrc_data(data); |
05f3fb3c | 7459 | ctx->file_data = NULL; |
6b06314c JA |
7460 | ctx->nr_user_files = 0; |
7461 | return 0; | |
7462 | } | |
7463 | ||
534ca6d6 | 7464 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7465 | { |
534ca6d6 | 7466 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7467 | /* |
7468 | * The park is a bit of a work-around, without it we get | |
7469 | * warning spews on shutdown with SQPOLL set and affinity | |
7470 | * set to a single CPU. | |
7471 | */ | |
534ca6d6 JA |
7472 | if (sqd->thread) { |
7473 | kthread_park(sqd->thread); | |
7474 | kthread_stop(sqd->thread); | |
7475 | } | |
7476 | ||
7477 | kfree(sqd); | |
7478 | } | |
7479 | } | |
7480 | ||
aa06165d JA |
7481 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7482 | { | |
7483 | struct io_ring_ctx *ctx_attach; | |
7484 | struct io_sq_data *sqd; | |
7485 | struct fd f; | |
7486 | ||
7487 | f = fdget(p->wq_fd); | |
7488 | if (!f.file) | |
7489 | return ERR_PTR(-ENXIO); | |
7490 | if (f.file->f_op != &io_uring_fops) { | |
7491 | fdput(f); | |
7492 | return ERR_PTR(-EINVAL); | |
7493 | } | |
7494 | ||
7495 | ctx_attach = f.file->private_data; | |
7496 | sqd = ctx_attach->sq_data; | |
7497 | if (!sqd) { | |
7498 | fdput(f); | |
7499 | return ERR_PTR(-EINVAL); | |
7500 | } | |
7501 | ||
7502 | refcount_inc(&sqd->refs); | |
7503 | fdput(f); | |
7504 | return sqd; | |
7505 | } | |
7506 | ||
534ca6d6 JA |
7507 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7508 | { | |
7509 | struct io_sq_data *sqd; | |
7510 | ||
aa06165d JA |
7511 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7512 | return io_attach_sq_data(p); | |
7513 | ||
534ca6d6 JA |
7514 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7515 | if (!sqd) | |
7516 | return ERR_PTR(-ENOMEM); | |
7517 | ||
7518 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7519 | INIT_LIST_HEAD(&sqd->ctx_list); |
7520 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7521 | mutex_init(&sqd->ctx_lock); | |
7522 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7523 | init_waitqueue_head(&sqd->wait); |
7524 | return sqd; | |
7525 | } | |
7526 | ||
69fb2131 JA |
7527 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7528 | __releases(&sqd->lock) | |
7529 | { | |
7530 | if (!sqd->thread) | |
7531 | return; | |
7532 | kthread_unpark(sqd->thread); | |
7533 | mutex_unlock(&sqd->lock); | |
7534 | } | |
7535 | ||
7536 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7537 | __acquires(&sqd->lock) | |
7538 | { | |
7539 | if (!sqd->thread) | |
7540 | return; | |
7541 | mutex_lock(&sqd->lock); | |
7542 | kthread_park(sqd->thread); | |
7543 | } | |
7544 | ||
534ca6d6 JA |
7545 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7546 | { | |
7547 | struct io_sq_data *sqd = ctx->sq_data; | |
7548 | ||
7549 | if (sqd) { | |
7550 | if (sqd->thread) { | |
7551 | /* | |
7552 | * We may arrive here from the error branch in | |
7553 | * io_sq_offload_create() where the kthread is created | |
7554 | * without being waked up, thus wake it up now to make | |
7555 | * sure the wait will complete. | |
7556 | */ | |
7557 | wake_up_process(sqd->thread); | |
7558 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7559 | |
7560 | io_sq_thread_park(sqd); | |
7561 | } | |
7562 | ||
7563 | mutex_lock(&sqd->ctx_lock); | |
7564 | list_del(&ctx->sqd_list); | |
08369246 | 7565 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7566 | mutex_unlock(&sqd->ctx_lock); |
7567 | ||
08369246 | 7568 | if (sqd->thread) |
69fb2131 | 7569 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7570 | |
7571 | io_put_sq_data(sqd); | |
7572 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7573 | } |
7574 | } | |
7575 | ||
6b06314c JA |
7576 | static void io_finish_async(struct io_ring_ctx *ctx) |
7577 | { | |
6c271ce2 JA |
7578 | io_sq_thread_stop(ctx); |
7579 | ||
561fb04a JA |
7580 | if (ctx->io_wq) { |
7581 | io_wq_destroy(ctx->io_wq); | |
7582 | ctx->io_wq = NULL; | |
6b06314c JA |
7583 | } |
7584 | } | |
7585 | ||
7586 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7587 | /* |
7588 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7589 | * the io_uring can be safely unregistered on process exit, even if we have | |
7590 | * loops in the file referencing. | |
7591 | */ | |
7592 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7593 | { | |
7594 | struct sock *sk = ctx->ring_sock->sk; | |
7595 | struct scm_fp_list *fpl; | |
7596 | struct sk_buff *skb; | |
08a45173 | 7597 | int i, nr_files; |
6b06314c | 7598 | |
6b06314c JA |
7599 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7600 | if (!fpl) | |
7601 | return -ENOMEM; | |
7602 | ||
7603 | skb = alloc_skb(0, GFP_KERNEL); | |
7604 | if (!skb) { | |
7605 | kfree(fpl); | |
7606 | return -ENOMEM; | |
7607 | } | |
7608 | ||
7609 | skb->sk = sk; | |
6b06314c | 7610 | |
08a45173 | 7611 | nr_files = 0; |
6b06314c JA |
7612 | fpl->user = get_uid(ctx->user); |
7613 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7614 | struct file *file = io_file_from_index(ctx, i + offset); |
7615 | ||
7616 | if (!file) | |
08a45173 | 7617 | continue; |
65e19f54 | 7618 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7619 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7620 | nr_files++; | |
6b06314c JA |
7621 | } |
7622 | ||
08a45173 JA |
7623 | if (nr_files) { |
7624 | fpl->max = SCM_MAX_FD; | |
7625 | fpl->count = nr_files; | |
7626 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7627 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7628 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7629 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7630 | |
08a45173 JA |
7631 | for (i = 0; i < nr_files; i++) |
7632 | fput(fpl->fp[i]); | |
7633 | } else { | |
7634 | kfree_skb(skb); | |
7635 | kfree(fpl); | |
7636 | } | |
6b06314c JA |
7637 | |
7638 | return 0; | |
7639 | } | |
7640 | ||
7641 | /* | |
7642 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7643 | * causes regular reference counting to break down. We rely on the UNIX | |
7644 | * garbage collection to take care of this problem for us. | |
7645 | */ | |
7646 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7647 | { | |
7648 | unsigned left, total; | |
7649 | int ret = 0; | |
7650 | ||
7651 | total = 0; | |
7652 | left = ctx->nr_user_files; | |
7653 | while (left) { | |
7654 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7655 | |
7656 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7657 | if (ret) | |
7658 | break; | |
7659 | left -= this_files; | |
7660 | total += this_files; | |
7661 | } | |
7662 | ||
7663 | if (!ret) | |
7664 | return 0; | |
7665 | ||
7666 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7667 | struct file *file = io_file_from_index(ctx, total); |
7668 | ||
7669 | if (file) | |
7670 | fput(file); | |
6b06314c JA |
7671 | total++; |
7672 | } | |
7673 | ||
7674 | return ret; | |
7675 | } | |
7676 | #else | |
7677 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7678 | { | |
7679 | return 0; | |
7680 | } | |
7681 | #endif | |
7682 | ||
269bbe5f | 7683 | static int io_sqe_alloc_file_tables(struct fixed_rsrc_data *file_data, |
5398ae69 | 7684 | unsigned nr_tables, unsigned nr_files) |
65e19f54 JA |
7685 | { |
7686 | int i; | |
7687 | ||
7688 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7689 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7690 | unsigned this_files; |
7691 | ||
7692 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7693 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7694 | GFP_KERNEL); | |
7695 | if (!table->files) | |
7696 | break; | |
7697 | nr_files -= this_files; | |
7698 | } | |
7699 | ||
7700 | if (i == nr_tables) | |
7701 | return 0; | |
7702 | ||
7703 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7704 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7705 | kfree(table->files); |
7706 | } | |
7707 | return 1; | |
7708 | } | |
7709 | ||
50238531 | 7710 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7711 | { |
50238531 | 7712 | struct file *file = prsrc->file; |
05f3fb3c JA |
7713 | #if defined(CONFIG_UNIX) |
7714 | struct sock *sock = ctx->ring_sock->sk; | |
7715 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7716 | struct sk_buff *skb; | |
7717 | int i; | |
7718 | ||
7719 | __skb_queue_head_init(&list); | |
7720 | ||
7721 | /* | |
7722 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7723 | * remove this entry and rearrange the file array. | |
7724 | */ | |
7725 | skb = skb_dequeue(head); | |
7726 | while (skb) { | |
7727 | struct scm_fp_list *fp; | |
7728 | ||
7729 | fp = UNIXCB(skb).fp; | |
7730 | for (i = 0; i < fp->count; i++) { | |
7731 | int left; | |
7732 | ||
7733 | if (fp->fp[i] != file) | |
7734 | continue; | |
7735 | ||
7736 | unix_notinflight(fp->user, fp->fp[i]); | |
7737 | left = fp->count - 1 - i; | |
7738 | if (left) { | |
7739 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7740 | left * sizeof(struct file *)); | |
7741 | } | |
7742 | fp->count--; | |
7743 | if (!fp->count) { | |
7744 | kfree_skb(skb); | |
7745 | skb = NULL; | |
7746 | } else { | |
7747 | __skb_queue_tail(&list, skb); | |
7748 | } | |
7749 | fput(file); | |
7750 | file = NULL; | |
7751 | break; | |
7752 | } | |
7753 | ||
7754 | if (!file) | |
7755 | break; | |
7756 | ||
7757 | __skb_queue_tail(&list, skb); | |
7758 | ||
7759 | skb = skb_dequeue(head); | |
7760 | } | |
7761 | ||
7762 | if (skb_peek(&list)) { | |
7763 | spin_lock_irq(&head->lock); | |
7764 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7765 | __skb_queue_tail(head, skb); | |
7766 | spin_unlock_irq(&head->lock); | |
7767 | } | |
7768 | #else | |
7769 | fput(file); | |
7770 | #endif | |
7771 | } | |
7772 | ||
269bbe5f | 7773 | static void __io_rsrc_put_work(struct fixed_rsrc_ref_node *ref_node) |
65e19f54 | 7774 | { |
269bbe5f BM |
7775 | struct fixed_rsrc_data *rsrc_data = ref_node->rsrc_data; |
7776 | struct io_ring_ctx *ctx = rsrc_data->ctx; | |
7777 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7778 | |
269bbe5f BM |
7779 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7780 | list_del(&prsrc->list); | |
50238531 | 7781 | ref_node->rsrc_put(ctx, prsrc); |
269bbe5f | 7782 | kfree(prsrc); |
65e19f54 | 7783 | } |
05589553 | 7784 | |
05589553 XW |
7785 | percpu_ref_exit(&ref_node->refs); |
7786 | kfree(ref_node); | |
269bbe5f | 7787 | percpu_ref_put(&rsrc_data->refs); |
2faf852d | 7788 | } |
65e19f54 | 7789 | |
269bbe5f | 7790 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7791 | { |
7792 | struct io_ring_ctx *ctx; | |
7793 | struct llist_node *node; | |
7794 | ||
269bbe5f BM |
7795 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7796 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7797 | |
7798 | while (node) { | |
269bbe5f | 7799 | struct fixed_rsrc_ref_node *ref_node; |
4a38aed2 JA |
7800 | struct llist_node *next = node->next; |
7801 | ||
269bbe5f BM |
7802 | ref_node = llist_entry(node, struct fixed_rsrc_ref_node, llist); |
7803 | __io_rsrc_put_work(ref_node); | |
4a38aed2 JA |
7804 | node = next; |
7805 | } | |
7806 | } | |
7807 | ||
ea64ec02 PB |
7808 | static struct file **io_fixed_file_slot(struct fixed_rsrc_data *file_data, |
7809 | unsigned i) | |
7810 | { | |
7811 | struct fixed_rsrc_table *table; | |
7812 | ||
7813 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7814 | return &table->files[i & IORING_FILE_TABLE_MASK]; | |
7815 | } | |
7816 | ||
00835dce | 7817 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
2faf852d | 7818 | { |
269bbe5f BM |
7819 | struct fixed_rsrc_ref_node *ref_node; |
7820 | struct fixed_rsrc_data *data; | |
4a38aed2 | 7821 | struct io_ring_ctx *ctx; |
e297822b | 7822 | bool first_add = false; |
4a38aed2 | 7823 | int delay = HZ; |
65e19f54 | 7824 | |
269bbe5f BM |
7825 | ref_node = container_of(ref, struct fixed_rsrc_ref_node, refs); |
7826 | data = ref_node->rsrc_data; | |
e297822b PB |
7827 | ctx = data->ctx; |
7828 | ||
2a63b2d9 | 7829 | io_rsrc_ref_lock(ctx); |
e297822b PB |
7830 | ref_node->done = true; |
7831 | ||
d67d2263 BM |
7832 | while (!list_empty(&ctx->rsrc_ref_list)) { |
7833 | ref_node = list_first_entry(&ctx->rsrc_ref_list, | |
269bbe5f | 7834 | struct fixed_rsrc_ref_node, node); |
e297822b PB |
7835 | /* recycle ref nodes in order */ |
7836 | if (!ref_node->done) | |
7837 | break; | |
7838 | list_del(&ref_node->node); | |
269bbe5f | 7839 | first_add |= llist_add(&ref_node->llist, &ctx->rsrc_put_llist); |
e297822b | 7840 | } |
2a63b2d9 | 7841 | io_rsrc_ref_unlock(ctx); |
05589553 | 7842 | |
e297822b | 7843 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7844 | delay = 0; |
05589553 | 7845 | |
4a38aed2 | 7846 | if (!delay) |
269bbe5f | 7847 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, 0); |
4a38aed2 | 7848 | else if (first_add) |
269bbe5f | 7849 | queue_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
05f3fb3c | 7850 | } |
65e19f54 | 7851 | |
6802535d | 7852 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
05589553 | 7853 | struct io_ring_ctx *ctx) |
05f3fb3c | 7854 | { |
269bbe5f | 7855 | struct fixed_rsrc_ref_node *ref_node; |
05f3fb3c | 7856 | |
05589553 XW |
7857 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7858 | if (!ref_node) | |
3e2224c5 | 7859 | return NULL; |
05f3fb3c | 7860 | |
00835dce | 7861 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
05589553 XW |
7862 | 0, GFP_KERNEL)) { |
7863 | kfree(ref_node); | |
3e2224c5 | 7864 | return NULL; |
05589553 XW |
7865 | } |
7866 | INIT_LIST_HEAD(&ref_node->node); | |
269bbe5f | 7867 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
6802535d BM |
7868 | ref_node->done = false; |
7869 | return ref_node; | |
7870 | } | |
7871 | ||
bc9744cd PB |
7872 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
7873 | struct fixed_rsrc_ref_node *ref_node) | |
6802535d | 7874 | { |
269bbe5f | 7875 | ref_node->rsrc_data = ctx->file_data; |
50238531 | 7876 | ref_node->rsrc_put = io_ring_file_put; |
05589553 XW |
7877 | } |
7878 | ||
269bbe5f | 7879 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node) |
05589553 XW |
7880 | { |
7881 | percpu_ref_exit(&ref_node->refs); | |
7882 | kfree(ref_node); | |
65e19f54 JA |
7883 | } |
7884 | ||
ea64ec02 | 7885 | |
6b06314c JA |
7886 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7887 | unsigned nr_args) | |
7888 | { | |
7889 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7890 | unsigned nr_tables, i; |
05f3fb3c | 7891 | struct file *file; |
600cf3f8 | 7892 | int fd, ret = -ENOMEM; |
269bbe5f BM |
7893 | struct fixed_rsrc_ref_node *ref_node; |
7894 | struct fixed_rsrc_data *file_data; | |
6b06314c | 7895 | |
05f3fb3c | 7896 | if (ctx->file_data) |
6b06314c JA |
7897 | return -EBUSY; |
7898 | if (!nr_args) | |
7899 | return -EINVAL; | |
7900 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7901 | return -EMFILE; | |
7902 | ||
1ad555c6 | 7903 | file_data = alloc_fixed_rsrc_data(ctx); |
5398ae69 | 7904 | if (!file_data) |
05f3fb3c | 7905 | return -ENOMEM; |
13770a71 | 7906 | ctx->file_data = file_data; |
05f3fb3c | 7907 | |
65e19f54 | 7908 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7909 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7910 | GFP_KERNEL); |
600cf3f8 PB |
7911 | if (!file_data->table) |
7912 | goto out_free; | |
05f3fb3c | 7913 | |
600cf3f8 | 7914 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
1ad555c6 | 7915 | goto out_free; |
65e19f54 | 7916 | |
08a45173 | 7917 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
600cf3f8 PB |
7918 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7919 | ret = -EFAULT; | |
7920 | goto out_fput; | |
7921 | } | |
08a45173 | 7922 | /* allow sparse sets */ |
600cf3f8 | 7923 | if (fd == -1) |
08a45173 | 7924 | continue; |
6b06314c | 7925 | |
05f3fb3c | 7926 | file = fget(fd); |
6b06314c | 7927 | ret = -EBADF; |
05f3fb3c | 7928 | if (!file) |
600cf3f8 | 7929 | goto out_fput; |
05f3fb3c | 7930 | |
6b06314c JA |
7931 | /* |
7932 | * Don't allow io_uring instances to be registered. If UNIX | |
7933 | * isn't enabled, then this causes a reference cycle and this | |
7934 | * instance can never get freed. If UNIX is enabled we'll | |
7935 | * handle it just fine, but there's still no point in allowing | |
7936 | * a ring fd as it doesn't support regular read/write anyway. | |
7937 | */ | |
05f3fb3c JA |
7938 | if (file->f_op == &io_uring_fops) { |
7939 | fput(file); | |
600cf3f8 | 7940 | goto out_fput; |
6b06314c | 7941 | } |
ea64ec02 | 7942 | *io_fixed_file_slot(file_data, i) = file; |
6b06314c JA |
7943 | } |
7944 | ||
6b06314c | 7945 | ret = io_sqe_files_scm(ctx); |
05589553 | 7946 | if (ret) { |
6b06314c | 7947 | io_sqe_files_unregister(ctx); |
05589553 XW |
7948 | return ret; |
7949 | } | |
6b06314c | 7950 | |
bc9744cd | 7951 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 | 7952 | if (!ref_node) { |
05589553 | 7953 | io_sqe_files_unregister(ctx); |
3e2224c5 | 7954 | return -ENOMEM; |
05589553 | 7955 | } |
bc9744cd | 7956 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 7957 | |
d67d2263 | 7958 | io_sqe_rsrc_set_node(ctx, file_data, ref_node); |
6b06314c | 7959 | return ret; |
600cf3f8 PB |
7960 | out_fput: |
7961 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7962 | file = io_file_from_index(ctx, i); | |
7963 | if (file) | |
7964 | fput(file); | |
7965 | } | |
7966 | for (i = 0; i < nr_tables; i++) | |
7967 | kfree(file_data->table[i].files); | |
7968 | ctx->nr_user_files = 0; | |
600cf3f8 | 7969 | out_free: |
1ad555c6 | 7970 | free_fixed_rsrc_data(ctx->file_data); |
55cbc256 | 7971 | ctx->file_data = NULL; |
6b06314c JA |
7972 | return ret; |
7973 | } | |
7974 | ||
c3a31e60 JA |
7975 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7976 | int index) | |
7977 | { | |
7978 | #if defined(CONFIG_UNIX) | |
7979 | struct sock *sock = ctx->ring_sock->sk; | |
7980 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7981 | struct sk_buff *skb; | |
7982 | ||
7983 | /* | |
7984 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7985 | * file set. If there's no room, fall back to allocating a new skb | |
7986 | * and filling it in. | |
7987 | */ | |
7988 | spin_lock_irq(&head->lock); | |
7989 | skb = skb_peek(head); | |
7990 | if (skb) { | |
7991 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7992 | ||
7993 | if (fpl->count < SCM_MAX_FD) { | |
7994 | __skb_unlink(skb, head); | |
7995 | spin_unlock_irq(&head->lock); | |
7996 | fpl->fp[fpl->count] = get_file(file); | |
7997 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7998 | fpl->count++; | |
7999 | spin_lock_irq(&head->lock); | |
8000 | __skb_queue_head(head, skb); | |
8001 | } else { | |
8002 | skb = NULL; | |
8003 | } | |
8004 | } | |
8005 | spin_unlock_irq(&head->lock); | |
8006 | ||
8007 | if (skb) { | |
8008 | fput(file); | |
8009 | return 0; | |
8010 | } | |
8011 | ||
8012 | return __io_sqe_files_scm(ctx, 1, index); | |
8013 | #else | |
8014 | return 0; | |
8015 | #endif | |
8016 | } | |
8017 | ||
50238531 | 8018 | static int io_queue_rsrc_removal(struct fixed_rsrc_data *data, void *rsrc) |
05f3fb3c | 8019 | { |
269bbe5f BM |
8020 | struct io_rsrc_put *prsrc; |
8021 | struct fixed_rsrc_ref_node *ref_node = data->node; | |
05f3fb3c | 8022 | |
269bbe5f BM |
8023 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
8024 | if (!prsrc) | |
a5318d3c | 8025 | return -ENOMEM; |
05f3fb3c | 8026 | |
50238531 | 8027 | prsrc->rsrc = rsrc; |
269bbe5f | 8028 | list_add(&prsrc->list, &ref_node->rsrc_list); |
05589553 | 8029 | |
a5318d3c | 8030 | return 0; |
05f3fb3c JA |
8031 | } |
8032 | ||
269bbe5f BM |
8033 | static inline int io_queue_file_removal(struct fixed_rsrc_data *data, |
8034 | struct file *file) | |
8035 | { | |
50238531 | 8036 | return io_queue_rsrc_removal(data, (void *)file); |
269bbe5f BM |
8037 | } |
8038 | ||
05f3fb3c | 8039 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 8040 | struct io_uring_rsrc_update *up, |
05f3fb3c JA |
8041 | unsigned nr_args) |
8042 | { | |
269bbe5f BM |
8043 | struct fixed_rsrc_data *data = ctx->file_data; |
8044 | struct fixed_rsrc_ref_node *ref_node; | |
ea64ec02 | 8045 | struct file *file, **file_slot; |
c3a31e60 JA |
8046 | __s32 __user *fds; |
8047 | int fd, i, err; | |
8048 | __u32 done; | |
05589553 | 8049 | bool needs_switch = false; |
c3a31e60 | 8050 | |
05f3fb3c | 8051 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
8052 | return -EOVERFLOW; |
8053 | if (done > ctx->nr_user_files) | |
8054 | return -EINVAL; | |
8055 | ||
bc9744cd | 8056 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 MWO |
8057 | if (!ref_node) |
8058 | return -ENOMEM; | |
bc9744cd | 8059 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 8060 | |
269bbe5f | 8061 | fds = u64_to_user_ptr(up->data); |
67973b93 | 8062 | for (done = 0; done < nr_args; done++) { |
c3a31e60 JA |
8063 | err = 0; |
8064 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
8065 | err = -EFAULT; | |
8066 | break; | |
8067 | } | |
4e0377a1 | 8068 | if (fd == IORING_REGISTER_FILES_SKIP) |
8069 | continue; | |
8070 | ||
67973b93 | 8071 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
ea64ec02 PB |
8072 | file_slot = io_fixed_file_slot(ctx->file_data, i); |
8073 | ||
8074 | if (*file_slot) { | |
8075 | err = io_queue_file_removal(data, *file_slot); | |
a5318d3c HD |
8076 | if (err) |
8077 | break; | |
ea64ec02 | 8078 | *file_slot = NULL; |
05589553 | 8079 | needs_switch = true; |
c3a31e60 JA |
8080 | } |
8081 | if (fd != -1) { | |
c3a31e60 JA |
8082 | file = fget(fd); |
8083 | if (!file) { | |
8084 | err = -EBADF; | |
8085 | break; | |
8086 | } | |
8087 | /* | |
8088 | * Don't allow io_uring instances to be registered. If | |
8089 | * UNIX isn't enabled, then this causes a reference | |
8090 | * cycle and this instance can never get freed. If UNIX | |
8091 | * is enabled we'll handle it just fine, but there's | |
8092 | * still no point in allowing a ring fd as it doesn't | |
8093 | * support regular read/write anyway. | |
8094 | */ | |
8095 | if (file->f_op == &io_uring_fops) { | |
8096 | fput(file); | |
8097 | err = -EBADF; | |
8098 | break; | |
8099 | } | |
e68a3ff8 | 8100 | *file_slot = file; |
c3a31e60 | 8101 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8102 | if (err) { |
e68a3ff8 | 8103 | *file_slot = NULL; |
f3bd9dae | 8104 | fput(file); |
c3a31e60 | 8105 | break; |
f3bd9dae | 8106 | } |
c3a31e60 | 8107 | } |
05f3fb3c JA |
8108 | } |
8109 | ||
05589553 | 8110 | if (needs_switch) { |
b2e96852 | 8111 | percpu_ref_kill(&data->node->refs); |
d67d2263 | 8112 | io_sqe_rsrc_set_node(ctx, data, ref_node); |
05589553 | 8113 | } else |
269bbe5f | 8114 | destroy_fixed_rsrc_ref_node(ref_node); |
c3a31e60 JA |
8115 | |
8116 | return done ? done : err; | |
8117 | } | |
05589553 | 8118 | |
05f3fb3c JA |
8119 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
8120 | unsigned nr_args) | |
8121 | { | |
269bbe5f | 8122 | struct io_uring_rsrc_update up; |
05f3fb3c JA |
8123 | |
8124 | if (!ctx->file_data) | |
8125 | return -ENXIO; | |
8126 | if (!nr_args) | |
8127 | return -EINVAL; | |
8128 | if (copy_from_user(&up, arg, sizeof(up))) | |
8129 | return -EFAULT; | |
8130 | if (up.resv) | |
8131 | return -EINVAL; | |
8132 | ||
8133 | return __io_sqe_files_update(ctx, &up, nr_args); | |
8134 | } | |
c3a31e60 | 8135 | |
5280f7e5 | 8136 | static struct io_wq_work *io_free_work(struct io_wq_work *work) |
7d723065 JA |
8137 | { |
8138 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8139 | ||
5280f7e5 PB |
8140 | req = io_put_req_find_next(req); |
8141 | return req ? &req->work : NULL; | |
7d723065 JA |
8142 | } |
8143 | ||
24369c2e PB |
8144 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
8145 | struct io_uring_params *p) | |
8146 | { | |
8147 | struct io_wq_data data; | |
8148 | struct fd f; | |
8149 | struct io_ring_ctx *ctx_attach; | |
8150 | unsigned int concurrency; | |
8151 | int ret = 0; | |
8152 | ||
8153 | data.user = ctx->user; | |
e9fd9396 | 8154 | data.free_work = io_free_work; |
f5fa38c5 | 8155 | data.do_work = io_wq_submit_work; |
24369c2e PB |
8156 | |
8157 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
8158 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
8159 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
8160 | ||
8161 | ctx->io_wq = io_wq_create(concurrency, &data); | |
8162 | if (IS_ERR(ctx->io_wq)) { | |
8163 | ret = PTR_ERR(ctx->io_wq); | |
8164 | ctx->io_wq = NULL; | |
8165 | } | |
8166 | return ret; | |
8167 | } | |
8168 | ||
8169 | f = fdget(p->wq_fd); | |
8170 | if (!f.file) | |
8171 | return -EBADF; | |
8172 | ||
8173 | if (f.file->f_op != &io_uring_fops) { | |
8174 | ret = -EINVAL; | |
8175 | goto out_fput; | |
8176 | } | |
8177 | ||
8178 | ctx_attach = f.file->private_data; | |
8179 | /* @io_wq is protected by holding the fd */ | |
8180 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
8181 | ret = -EINVAL; | |
8182 | goto out_fput; | |
8183 | } | |
8184 | ||
8185 | ctx->io_wq = ctx_attach->io_wq; | |
8186 | out_fput: | |
8187 | fdput(f); | |
8188 | return ret; | |
8189 | } | |
8190 | ||
0f212204 JA |
8191 | static int io_uring_alloc_task_context(struct task_struct *task) |
8192 | { | |
8193 | struct io_uring_task *tctx; | |
d8a6df10 | 8194 | int ret; |
0f212204 JA |
8195 | |
8196 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
8197 | if (unlikely(!tctx)) | |
8198 | return -ENOMEM; | |
8199 | ||
d8a6df10 JA |
8200 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8201 | if (unlikely(ret)) { | |
8202 | kfree(tctx); | |
8203 | return ret; | |
8204 | } | |
8205 | ||
0f212204 JA |
8206 | xa_init(&tctx->xa); |
8207 | init_waitqueue_head(&tctx->wait); | |
8208 | tctx->last = NULL; | |
fdaf083c JA |
8209 | atomic_set(&tctx->in_idle, 0); |
8210 | tctx->sqpoll = false; | |
500a373d JA |
8211 | io_init_identity(&tctx->__identity); |
8212 | tctx->identity = &tctx->__identity; | |
0f212204 | 8213 | task->io_uring = tctx; |
7cbf1722 JA |
8214 | spin_lock_init(&tctx->task_lock); |
8215 | INIT_WQ_LIST(&tctx->task_list); | |
8216 | tctx->task_state = 0; | |
8217 | init_task_work(&tctx->task_work, tctx_task_work); | |
0f212204 JA |
8218 | return 0; |
8219 | } | |
8220 | ||
8221 | void __io_uring_free(struct task_struct *tsk) | |
8222 | { | |
8223 | struct io_uring_task *tctx = tsk->io_uring; | |
8224 | ||
8225 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8226 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8227 | if (tctx->identity != &tctx->__identity) | |
8228 | kfree(tctx->identity); | |
d8a6df10 | 8229 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8230 | kfree(tctx); |
8231 | tsk->io_uring = NULL; | |
8232 | } | |
8233 | ||
7e84e1c7 SG |
8234 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8235 | struct io_uring_params *p) | |
2b188cc1 JA |
8236 | { |
8237 | int ret; | |
8238 | ||
6c271ce2 | 8239 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8240 | struct io_sq_data *sqd; |
8241 | ||
3ec482d1 | 8242 | ret = -EPERM; |
ce59fc69 | 8243 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8244 | goto err; |
8245 | ||
534ca6d6 JA |
8246 | sqd = io_get_sq_data(p); |
8247 | if (IS_ERR(sqd)) { | |
8248 | ret = PTR_ERR(sqd); | |
8249 | goto err; | |
8250 | } | |
69fb2131 | 8251 | |
534ca6d6 | 8252 | ctx->sq_data = sqd; |
69fb2131 JA |
8253 | io_sq_thread_park(sqd); |
8254 | mutex_lock(&sqd->ctx_lock); | |
8255 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8256 | mutex_unlock(&sqd->ctx_lock); | |
8257 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8258 | |
917257da JA |
8259 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8260 | if (!ctx->sq_thread_idle) | |
8261 | ctx->sq_thread_idle = HZ; | |
8262 | ||
aa06165d JA |
8263 | if (sqd->thread) |
8264 | goto done; | |
8265 | ||
6c271ce2 | 8266 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8267 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8268 | |
917257da | 8269 | ret = -EINVAL; |
44a9bd18 JA |
8270 | if (cpu >= nr_cpu_ids) |
8271 | goto err; | |
7889f44d | 8272 | if (!cpu_online(cpu)) |
917257da JA |
8273 | goto err; |
8274 | ||
69fb2131 | 8275 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8276 | cpu, "io_uring-sq"); |
6c271ce2 | 8277 | } else { |
69fb2131 | 8278 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8279 | "io_uring-sq"); |
8280 | } | |
534ca6d6 JA |
8281 | if (IS_ERR(sqd->thread)) { |
8282 | ret = PTR_ERR(sqd->thread); | |
8283 | sqd->thread = NULL; | |
6c271ce2 JA |
8284 | goto err; |
8285 | } | |
534ca6d6 | 8286 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8287 | if (ret) |
8288 | goto err; | |
6c271ce2 JA |
8289 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8290 | /* Can't have SQ_AFF without SQPOLL */ | |
8291 | ret = -EINVAL; | |
8292 | goto err; | |
8293 | } | |
8294 | ||
aa06165d | 8295 | done: |
24369c2e PB |
8296 | ret = io_init_wq_offload(ctx, p); |
8297 | if (ret) | |
2b188cc1 | 8298 | goto err; |
2b188cc1 JA |
8299 | |
8300 | return 0; | |
8301 | err: | |
54a91f3b | 8302 | io_finish_async(ctx); |
2b188cc1 JA |
8303 | return ret; |
8304 | } | |
8305 | ||
7e84e1c7 SG |
8306 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8307 | { | |
534ca6d6 JA |
8308 | struct io_sq_data *sqd = ctx->sq_data; |
8309 | ||
8310 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8311 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8312 | } |
8313 | ||
a087e2b5 BM |
8314 | static inline void __io_unaccount_mem(struct user_struct *user, |
8315 | unsigned long nr_pages) | |
2b188cc1 JA |
8316 | { |
8317 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8318 | } | |
8319 | ||
a087e2b5 BM |
8320 | static inline int __io_account_mem(struct user_struct *user, |
8321 | unsigned long nr_pages) | |
2b188cc1 JA |
8322 | { |
8323 | unsigned long page_limit, cur_pages, new_pages; | |
8324 | ||
8325 | /* Don't allow more pages than we can safely lock */ | |
8326 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8327 | ||
8328 | do { | |
8329 | cur_pages = atomic_long_read(&user->locked_vm); | |
8330 | new_pages = cur_pages + nr_pages; | |
8331 | if (new_pages > page_limit) | |
8332 | return -ENOMEM; | |
8333 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8334 | new_pages) != cur_pages); | |
8335 | ||
8336 | return 0; | |
8337 | } | |
8338 | ||
26bfa89e | 8339 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8340 | { |
aad5d8da | 8341 | if (ctx->limit_mem) |
a087e2b5 | 8342 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8343 | |
26bfa89e JA |
8344 | if (ctx->mm_account) |
8345 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8346 | } |
8347 | ||
26bfa89e | 8348 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8349 | { |
30975825 BM |
8350 | int ret; |
8351 | ||
8352 | if (ctx->limit_mem) { | |
8353 | ret = __io_account_mem(ctx->user, nr_pages); | |
8354 | if (ret) | |
8355 | return ret; | |
8356 | } | |
8357 | ||
26bfa89e JA |
8358 | if (ctx->mm_account) |
8359 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8360 | |
8361 | return 0; | |
8362 | } | |
8363 | ||
2b188cc1 JA |
8364 | static void io_mem_free(void *ptr) |
8365 | { | |
52e04ef4 MR |
8366 | struct page *page; |
8367 | ||
8368 | if (!ptr) | |
8369 | return; | |
2b188cc1 | 8370 | |
52e04ef4 | 8371 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8372 | if (put_page_testzero(page)) |
8373 | free_compound_page(page); | |
8374 | } | |
8375 | ||
8376 | static void *io_mem_alloc(size_t size) | |
8377 | { | |
8378 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8379 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8380 | |
8381 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8382 | } | |
8383 | ||
75b28aff HV |
8384 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8385 | size_t *sq_offset) | |
8386 | { | |
8387 | struct io_rings *rings; | |
8388 | size_t off, sq_array_size; | |
8389 | ||
8390 | off = struct_size(rings, cqes, cq_entries); | |
8391 | if (off == SIZE_MAX) | |
8392 | return SIZE_MAX; | |
8393 | ||
8394 | #ifdef CONFIG_SMP | |
8395 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8396 | if (off == 0) | |
8397 | return SIZE_MAX; | |
8398 | #endif | |
8399 | ||
b36200f5 DV |
8400 | if (sq_offset) |
8401 | *sq_offset = off; | |
8402 | ||
75b28aff HV |
8403 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8404 | if (sq_array_size == SIZE_MAX) | |
8405 | return SIZE_MAX; | |
8406 | ||
8407 | if (check_add_overflow(off, sq_array_size, &off)) | |
8408 | return SIZE_MAX; | |
8409 | ||
75b28aff HV |
8410 | return off; |
8411 | } | |
8412 | ||
0a96bbe4 | 8413 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee JA |
8414 | { |
8415 | int i, j; | |
8416 | ||
8417 | if (!ctx->user_bufs) | |
8418 | return -ENXIO; | |
8419 | ||
8420 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8421 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8422 | ||
8423 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8424 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8425 | |
de293938 | 8426 | if (imu->acct_pages) |
26bfa89e | 8427 | io_unaccount_mem(ctx, imu->acct_pages); |
d4ef6475 | 8428 | kvfree(imu->bvec); |
edafccee JA |
8429 | imu->nr_bvecs = 0; |
8430 | } | |
8431 | ||
8432 | kfree(ctx->user_bufs); | |
8433 | ctx->user_bufs = NULL; | |
8434 | ctx->nr_user_bufs = 0; | |
8435 | return 0; | |
8436 | } | |
8437 | ||
8438 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8439 | void __user *arg, unsigned index) | |
8440 | { | |
8441 | struct iovec __user *src; | |
8442 | ||
8443 | #ifdef CONFIG_COMPAT | |
8444 | if (ctx->compat) { | |
8445 | struct compat_iovec __user *ciovs; | |
8446 | struct compat_iovec ciov; | |
8447 | ||
8448 | ciovs = (struct compat_iovec __user *) arg; | |
8449 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8450 | return -EFAULT; | |
8451 | ||
d55e5f5b | 8452 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8453 | dst->iov_len = ciov.iov_len; |
8454 | return 0; | |
8455 | } | |
8456 | #endif | |
8457 | src = (struct iovec __user *) arg; | |
8458 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8459 | return -EFAULT; | |
8460 | return 0; | |
8461 | } | |
8462 | ||
de293938 JA |
8463 | /* |
8464 | * Not super efficient, but this is just a registration time. And we do cache | |
8465 | * the last compound head, so generally we'll only do a full search if we don't | |
8466 | * match that one. | |
8467 | * | |
8468 | * We check if the given compound head page has already been accounted, to | |
8469 | * avoid double accounting it. This allows us to account the full size of the | |
8470 | * page, not just the constituent pages of a huge page. | |
8471 | */ | |
8472 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8473 | int nr_pages, struct page *hpage) | |
8474 | { | |
8475 | int i, j; | |
8476 | ||
8477 | /* check current page array */ | |
8478 | for (i = 0; i < nr_pages; i++) { | |
8479 | if (!PageCompound(pages[i])) | |
8480 | continue; | |
8481 | if (compound_head(pages[i]) == hpage) | |
8482 | return true; | |
8483 | } | |
8484 | ||
8485 | /* check previously registered pages */ | |
8486 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8487 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8488 | ||
8489 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8490 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8491 | continue; | |
8492 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8493 | return true; | |
8494 | } | |
8495 | } | |
8496 | ||
8497 | return false; | |
8498 | } | |
8499 | ||
8500 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8501 | int nr_pages, struct io_mapped_ubuf *imu, | |
8502 | struct page **last_hpage) | |
8503 | { | |
8504 | int i, ret; | |
8505 | ||
8506 | for (i = 0; i < nr_pages; i++) { | |
8507 | if (!PageCompound(pages[i])) { | |
8508 | imu->acct_pages++; | |
8509 | } else { | |
8510 | struct page *hpage; | |
8511 | ||
8512 | hpage = compound_head(pages[i]); | |
8513 | if (hpage == *last_hpage) | |
8514 | continue; | |
8515 | *last_hpage = hpage; | |
8516 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8517 | continue; | |
8518 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8519 | } | |
8520 | } | |
8521 | ||
8522 | if (!imu->acct_pages) | |
8523 | return 0; | |
8524 | ||
26bfa89e | 8525 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8526 | if (ret) |
8527 | imu->acct_pages = 0; | |
8528 | return ret; | |
8529 | } | |
8530 | ||
0a96bbe4 BM |
8531 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
8532 | struct io_mapped_ubuf *imu, | |
8533 | struct page **last_hpage) | |
edafccee JA |
8534 | { |
8535 | struct vm_area_struct **vmas = NULL; | |
8536 | struct page **pages = NULL; | |
0a96bbe4 BM |
8537 | unsigned long off, start, end, ubuf; |
8538 | size_t size; | |
8539 | int ret, pret, nr_pages, i; | |
8540 | ||
8541 | ubuf = (unsigned long) iov->iov_base; | |
8542 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8543 | start = ubuf >> PAGE_SHIFT; | |
8544 | nr_pages = end - start; | |
8545 | ||
8546 | ret = -ENOMEM; | |
8547 | ||
8548 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8549 | if (!pages) | |
8550 | goto done; | |
8551 | ||
8552 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8553 | GFP_KERNEL); | |
8554 | if (!vmas) | |
8555 | goto done; | |
8556 | ||
8557 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), | |
8558 | GFP_KERNEL); | |
8559 | if (!imu->bvec) | |
8560 | goto done; | |
8561 | ||
8562 | ret = 0; | |
8563 | mmap_read_lock(current->mm); | |
8564 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8565 | pages, vmas); | |
8566 | if (pret == nr_pages) { | |
8567 | /* don't support file backed memory */ | |
8568 | for (i = 0; i < nr_pages; i++) { | |
8569 | struct vm_area_struct *vma = vmas[i]; | |
8570 | ||
8571 | if (vma->vm_file && | |
8572 | !is_file_hugepages(vma->vm_file)) { | |
8573 | ret = -EOPNOTSUPP; | |
8574 | break; | |
8575 | } | |
8576 | } | |
8577 | } else { | |
8578 | ret = pret < 0 ? pret : -EFAULT; | |
8579 | } | |
8580 | mmap_read_unlock(current->mm); | |
8581 | if (ret) { | |
8582 | /* | |
8583 | * if we did partial map, or found file backed vmas, | |
8584 | * release any pages we did get | |
8585 | */ | |
8586 | if (pret > 0) | |
8587 | unpin_user_pages(pages, pret); | |
8588 | kvfree(imu->bvec); | |
8589 | goto done; | |
8590 | } | |
8591 | ||
8592 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8593 | if (ret) { | |
8594 | unpin_user_pages(pages, pret); | |
8595 | kvfree(imu->bvec); | |
8596 | goto done; | |
8597 | } | |
8598 | ||
8599 | off = ubuf & ~PAGE_MASK; | |
8600 | size = iov->iov_len; | |
8601 | for (i = 0; i < nr_pages; i++) { | |
8602 | size_t vec_len; | |
8603 | ||
8604 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8605 | imu->bvec[i].bv_page = pages[i]; | |
8606 | imu->bvec[i].bv_len = vec_len; | |
8607 | imu->bvec[i].bv_offset = off; | |
8608 | off = 0; | |
8609 | size -= vec_len; | |
8610 | } | |
8611 | /* store original address for later verification */ | |
8612 | imu->ubuf = ubuf; | |
8613 | imu->len = iov->iov_len; | |
8614 | imu->nr_bvecs = nr_pages; | |
8615 | ret = 0; | |
8616 | done: | |
8617 | kvfree(pages); | |
8618 | kvfree(vmas); | |
8619 | return ret; | |
8620 | } | |
8621 | ||
2b358604 | 8622 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8623 | { |
edafccee JA |
8624 | if (ctx->user_bufs) |
8625 | return -EBUSY; | |
8626 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8627 | return -EINVAL; | |
8628 | ||
8629 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8630 | GFP_KERNEL); | |
8631 | if (!ctx->user_bufs) | |
8632 | return -ENOMEM; | |
8633 | ||
2b358604 BM |
8634 | return 0; |
8635 | } | |
8636 | ||
8637 | static int io_buffer_validate(struct iovec *iov) | |
8638 | { | |
8639 | /* | |
8640 | * Don't impose further limits on the size and buffer | |
8641 | * constraints here, we'll -EINVAL later when IO is | |
8642 | * submitted if they are wrong. | |
8643 | */ | |
8644 | if (!iov->iov_base || !iov->iov_len) | |
8645 | return -EFAULT; | |
8646 | ||
8647 | /* arbitrary limit, but we need something */ | |
8648 | if (iov->iov_len > SZ_1G) | |
8649 | return -EFAULT; | |
8650 | ||
8651 | return 0; | |
8652 | } | |
8653 | ||
8654 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
8655 | unsigned int nr_args) | |
8656 | { | |
8657 | int i, ret; | |
8658 | struct iovec iov; | |
8659 | struct page *last_hpage = NULL; | |
8660 | ||
8661 | ret = io_buffers_map_alloc(ctx, nr_args); | |
8662 | if (ret) | |
8663 | return ret; | |
8664 | ||
edafccee JA |
8665 | for (i = 0; i < nr_args; i++) { |
8666 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
edafccee JA |
8667 | |
8668 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8669 | if (ret) | |
0a96bbe4 | 8670 | break; |
edafccee | 8671 | |
2b358604 BM |
8672 | ret = io_buffer_validate(&iov); |
8673 | if (ret) | |
0a96bbe4 | 8674 | break; |
edafccee | 8675 | |
0a96bbe4 BM |
8676 | ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage); |
8677 | if (ret) | |
8678 | break; | |
edafccee JA |
8679 | |
8680 | ctx->nr_user_bufs++; | |
8681 | } | |
0a96bbe4 BM |
8682 | |
8683 | if (ret) | |
8684 | io_sqe_buffers_unregister(ctx); | |
8685 | ||
edafccee JA |
8686 | return ret; |
8687 | } | |
8688 | ||
9b402849 JA |
8689 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8690 | { | |
8691 | __s32 __user *fds = arg; | |
8692 | int fd; | |
8693 | ||
8694 | if (ctx->cq_ev_fd) | |
8695 | return -EBUSY; | |
8696 | ||
8697 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8698 | return -EFAULT; | |
8699 | ||
8700 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8701 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8702 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8703 | ctx->cq_ev_fd = NULL; | |
8704 | return ret; | |
8705 | } | |
8706 | ||
8707 | return 0; | |
8708 | } | |
8709 | ||
8710 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8711 | { | |
8712 | if (ctx->cq_ev_fd) { | |
8713 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8714 | ctx->cq_ev_fd = NULL; | |
8715 | return 0; | |
8716 | } | |
8717 | ||
8718 | return -ENXIO; | |
8719 | } | |
8720 | ||
5a2e745d JA |
8721 | static int __io_destroy_buffers(int id, void *p, void *data) |
8722 | { | |
8723 | struct io_ring_ctx *ctx = data; | |
8724 | struct io_buffer *buf = p; | |
8725 | ||
067524e9 | 8726 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8727 | return 0; |
8728 | } | |
8729 | ||
8730 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8731 | { | |
8732 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8733 | idr_destroy(&ctx->io_buffer_idr); | |
8734 | } | |
8735 | ||
c7dae4ba | 8736 | static void io_req_cache_free(struct list_head *list) |
1b4c351f | 8737 | { |
c7dae4ba | 8738 | while (!list_empty(list)) { |
1b4c351f JA |
8739 | struct io_kiocb *req; |
8740 | ||
c7dae4ba | 8741 | req = list_first_entry(list, struct io_kiocb, compl.list); |
1b4c351f JA |
8742 | list_del(&req->compl.list); |
8743 | kmem_cache_free(req_cachep, req); | |
8744 | } | |
8745 | } | |
8746 | ||
2b188cc1 JA |
8747 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8748 | { | |
bf019da7 PB |
8749 | struct io_submit_state *submit_state = &ctx->submit_state; |
8750 | ||
6b06314c | 8751 | io_finish_async(ctx); |
0a96bbe4 | 8752 | io_sqe_buffers_unregister(ctx); |
2aede0e4 JA |
8753 | |
8754 | if (ctx->sqo_task) { | |
8755 | put_task_struct(ctx->sqo_task); | |
8756 | ctx->sqo_task = NULL; | |
8757 | mmdrop(ctx->mm_account); | |
8758 | ctx->mm_account = NULL; | |
30975825 | 8759 | } |
def596e9 | 8760 | |
bf019da7 PB |
8761 | if (submit_state->free_reqs) |
8762 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, | |
8763 | submit_state->reqs); | |
8764 | ||
91d8f519 DZ |
8765 | #ifdef CONFIG_BLK_CGROUP |
8766 | if (ctx->sqo_blkcg_css) | |
8767 | css_put(ctx->sqo_blkcg_css); | |
8768 | #endif | |
8769 | ||
6b06314c | 8770 | io_sqe_files_unregister(ctx); |
9b402849 | 8771 | io_eventfd_unregister(ctx); |
5a2e745d | 8772 | io_destroy_buffers(ctx); |
41726c9a | 8773 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8774 | |
2b188cc1 | 8775 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8776 | if (ctx->ring_sock) { |
8777 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8778 | sock_release(ctx->ring_sock); |
355e8d26 | 8779 | } |
2b188cc1 JA |
8780 | #endif |
8781 | ||
75b28aff | 8782 | io_mem_free(ctx->rings); |
2b188cc1 | 8783 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8784 | |
8785 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8786 | free_uid(ctx->user); |
181e448d | 8787 | put_cred(ctx->creds); |
78076bb6 | 8788 | kfree(ctx->cancel_hash); |
c7dae4ba JA |
8789 | io_req_cache_free(&ctx->submit_state.comp.free_list); |
8790 | io_req_cache_free(&ctx->submit_state.comp.locked_free_list); | |
2b188cc1 JA |
8791 | kfree(ctx); |
8792 | } | |
8793 | ||
8794 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8795 | { | |
8796 | struct io_ring_ctx *ctx = file->private_data; | |
8797 | __poll_t mask = 0; | |
8798 | ||
8799 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8800 | /* |
8801 | * synchronizes with barrier from wq_has_sleeper call in | |
8802 | * io_commit_cqring | |
8803 | */ | |
2b188cc1 | 8804 | smp_rmb(); |
90554200 | 8805 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8806 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8807 | |
8808 | /* | |
8809 | * Don't flush cqring overflow list here, just do a simple check. | |
8810 | * Otherwise there could possible be ABBA deadlock: | |
8811 | * CPU0 CPU1 | |
8812 | * ---- ---- | |
8813 | * lock(&ctx->uring_lock); | |
8814 | * lock(&ep->mtx); | |
8815 | * lock(&ctx->uring_lock); | |
8816 | * lock(&ep->mtx); | |
8817 | * | |
8818 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8819 | * pushs them to do the flush. | |
8820 | */ | |
8821 | if (io_cqring_events(ctx) || test_bit(0, &ctx->cq_check_overflow)) | |
2b188cc1 JA |
8822 | mask |= EPOLLIN | EPOLLRDNORM; |
8823 | ||
8824 | return mask; | |
8825 | } | |
8826 | ||
8827 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8828 | { | |
8829 | struct io_ring_ctx *ctx = file->private_data; | |
8830 | ||
8831 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8832 | } | |
8833 | ||
0bead8cd | 8834 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8835 | { |
1e6fa521 | 8836 | struct io_identity *iod; |
071698e1 | 8837 | |
1e6fa521 JA |
8838 | iod = idr_remove(&ctx->personality_idr, id); |
8839 | if (iod) { | |
8840 | put_cred(iod->creds); | |
8841 | if (refcount_dec_and_test(&iod->count)) | |
8842 | kfree(iod); | |
0bead8cd | 8843 | return 0; |
1e6fa521 | 8844 | } |
0bead8cd YD |
8845 | |
8846 | return -EINVAL; | |
8847 | } | |
8848 | ||
8849 | static int io_remove_personalities(int id, void *p, void *data) | |
8850 | { | |
8851 | struct io_ring_ctx *ctx = data; | |
8852 | ||
8853 | io_unregister_personality(ctx, id); | |
071698e1 JA |
8854 | return 0; |
8855 | } | |
8856 | ||
85faa7b8 JA |
8857 | static void io_ring_exit_work(struct work_struct *work) |
8858 | { | |
b2edc0a7 PB |
8859 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8860 | exit_work); | |
85faa7b8 | 8861 | |
56952e91 JA |
8862 | /* |
8863 | * If we're doing polled IO and end up having requests being | |
8864 | * submitted async (out-of-line), then completions can come in while | |
8865 | * we're waiting for refs to drop. We need to reap these manually, | |
8866 | * as nobody else will be looking for them. | |
8867 | */ | |
b2edc0a7 | 8868 | do { |
9936c7c2 | 8869 | io_uring_try_cancel_requests(ctx, NULL, NULL); |
b2edc0a7 | 8870 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
85faa7b8 JA |
8871 | io_ring_ctx_free(ctx); |
8872 | } | |
8873 | ||
00c18640 JA |
8874 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8875 | { | |
8876 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8877 | ||
8878 | return req->ctx == data; | |
8879 | } | |
8880 | ||
2b188cc1 JA |
8881 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8882 | { | |
8883 | mutex_lock(&ctx->uring_lock); | |
8884 | percpu_ref_kill(&ctx->refs); | |
d9d05217 PB |
8885 | |
8886 | if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead)) | |
8887 | ctx->sqo_dead = 1; | |
8888 | ||
cda286f0 PB |
8889 | /* if force is set, the ring is going away. always drop after that */ |
8890 | ctx->cq_overflow_flushed = 1; | |
634578f8 | 8891 | if (ctx->rings) |
6c503150 | 8892 | __io_cqring_overflow_flush(ctx, true, NULL, NULL); |
5c766a90 | 8893 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
2b188cc1 JA |
8894 | mutex_unlock(&ctx->uring_lock); |
8895 | ||
6b81928d PB |
8896 | io_kill_timeouts(ctx, NULL, NULL); |
8897 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8898 | |
8899 | if (ctx->io_wq) | |
00c18640 | 8900 | io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true); |
561fb04a | 8901 | |
15dff286 | 8902 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8903 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8904 | |
85faa7b8 | 8905 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8906 | /* |
8907 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8908 | * if we're exiting a ton of rings at the same time. It just adds | |
8909 | * noise and overhead, there's no discernable change in runtime | |
8910 | * over using system_wq. | |
8911 | */ | |
8912 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8913 | } |
8914 | ||
8915 | static int io_uring_release(struct inode *inode, struct file *file) | |
8916 | { | |
8917 | struct io_ring_ctx *ctx = file->private_data; | |
8918 | ||
8919 | file->private_data = NULL; | |
8920 | io_ring_ctx_wait_and_kill(ctx); | |
8921 | return 0; | |
8922 | } | |
8923 | ||
f6edbabb PB |
8924 | struct io_task_cancel { |
8925 | struct task_struct *task; | |
8926 | struct files_struct *files; | |
8927 | }; | |
f254ac04 | 8928 | |
f6edbabb | 8929 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8930 | { |
9a472ef7 | 8931 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8932 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8933 | bool ret; |
8934 | ||
f6edbabb | 8935 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8936 | unsigned long flags; |
8937 | struct io_ring_ctx *ctx = req->ctx; | |
8938 | ||
8939 | /* protect against races with linked timeouts */ | |
8940 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8941 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8942 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8943 | } else { | |
f6edbabb | 8944 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8945 | } |
8946 | return ret; | |
b711d4ea JA |
8947 | } |
8948 | ||
b7ddce3c | 8949 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8950 | struct task_struct *task, |
b7ddce3c PB |
8951 | struct files_struct *files) |
8952 | { | |
8953 | struct io_defer_entry *de = NULL; | |
8954 | LIST_HEAD(list); | |
8955 | ||
8956 | spin_lock_irq(&ctx->completion_lock); | |
8957 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8958 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8959 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8960 | break; | |
8961 | } | |
8962 | } | |
8963 | spin_unlock_irq(&ctx->completion_lock); | |
8964 | ||
8965 | while (!list_empty(&list)) { | |
8966 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8967 | list_del_init(&de->list); | |
8968 | req_set_fail_links(de->req); | |
8969 | io_put_req(de->req); | |
8970 | io_req_complete(de->req, -ECANCELED); | |
8971 | kfree(de); | |
8972 | } | |
8973 | } | |
8974 | ||
9936c7c2 PB |
8975 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
8976 | struct task_struct *task, | |
8977 | struct files_struct *files) | |
8978 | { | |
8979 | struct io_task_cancel cancel = { .task = task, .files = files, }; | |
8980 | ||
8981 | while (1) { | |
8982 | enum io_wq_cancel cret; | |
8983 | bool ret = false; | |
8984 | ||
8985 | if (ctx->io_wq) { | |
8986 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, | |
8987 | &cancel, true); | |
8988 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8989 | } | |
8990 | ||
8991 | /* SQPOLL thread does its own polling */ | |
8992 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && !files) { | |
8993 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8994 | io_iopoll_try_reap_events(ctx); | |
8995 | ret = true; | |
8996 | } | |
8997 | } | |
8998 | ||
8999 | ret |= io_poll_remove_all(ctx, task, files); | |
9000 | ret |= io_kill_timeouts(ctx, task, files); | |
9001 | ret |= io_run_task_work(); | |
9002 | io_cqring_overflow_flush(ctx, true, task, files); | |
9003 | if (!ret) | |
9004 | break; | |
9005 | cond_resched(); | |
9006 | } | |
9007 | } | |
9008 | ||
ca70f00b PB |
9009 | static int io_uring_count_inflight(struct io_ring_ctx *ctx, |
9010 | struct task_struct *task, | |
9011 | struct files_struct *files) | |
9012 | { | |
9013 | struct io_kiocb *req; | |
9014 | int cnt = 0; | |
9015 | ||
9016 | spin_lock_irq(&ctx->inflight_lock); | |
9017 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) | |
9018 | cnt += io_match_task(req, task, files); | |
9019 | spin_unlock_irq(&ctx->inflight_lock); | |
9020 | return cnt; | |
9021 | } | |
9022 | ||
b52fda00 | 9023 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 9024 | struct task_struct *task, |
fcb323cc JA |
9025 | struct files_struct *files) |
9026 | { | |
fcb323cc | 9027 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 | 9028 | DEFINE_WAIT(wait); |
ca70f00b | 9029 | int inflight; |
fcb323cc | 9030 | |
ca70f00b PB |
9031 | inflight = io_uring_count_inflight(ctx, task, files); |
9032 | if (!inflight) | |
fcb323cc | 9033 | break; |
f6edbabb | 9034 | |
9936c7c2 | 9035 | io_uring_try_cancel_requests(ctx, task, files); |
34343786 PB |
9036 | |
9037 | if (ctx->sq_data) | |
9038 | io_sq_thread_unpark(ctx->sq_data); | |
ca70f00b PB |
9039 | prepare_to_wait(&task->io_uring->wait, &wait, |
9040 | TASK_UNINTERRUPTIBLE); | |
9041 | if (inflight == io_uring_count_inflight(ctx, task, files)) | |
9042 | schedule(); | |
c98de08c | 9043 | finish_wait(&task->io_uring->wait, &wait); |
34343786 PB |
9044 | if (ctx->sq_data) |
9045 | io_sq_thread_park(ctx->sq_data); | |
fcb323cc | 9046 | } |
44e728b8 PB |
9047 | } |
9048 | ||
d9d05217 PB |
9049 | static void io_disable_sqo_submit(struct io_ring_ctx *ctx) |
9050 | { | |
d9d05217 PB |
9051 | mutex_lock(&ctx->uring_lock); |
9052 | ctx->sqo_dead = 1; | |
9053 | mutex_unlock(&ctx->uring_lock); | |
9054 | ||
9055 | /* make sure callers enter the ring to get error */ | |
b4411616 PB |
9056 | if (ctx->rings) |
9057 | io_ring_set_wakeup_flag(ctx); | |
d9d05217 PB |
9058 | } |
9059 | ||
0f212204 JA |
9060 | /* |
9061 | * We need to iteratively cancel requests, in case a request has dependent | |
9062 | * hard links. These persist even for failure of cancelations, hence keep | |
9063 | * looping until none are found. | |
9064 | */ | |
9065 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
9066 | struct files_struct *files) | |
9067 | { | |
9068 | struct task_struct *task = current; | |
9069 | ||
fdaf083c | 9070 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
d9d05217 | 9071 | io_disable_sqo_submit(ctx); |
534ca6d6 | 9072 | task = ctx->sq_data->thread; |
fdaf083c JA |
9073 | atomic_inc(&task->io_uring->in_idle); |
9074 | io_sq_thread_park(ctx->sq_data); | |
9075 | } | |
0f212204 | 9076 | |
df9923f9 | 9077 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 9078 | |
3a7efd1a | 9079 | io_uring_cancel_files(ctx, task, files); |
b52fda00 | 9080 | if (!files) |
9936c7c2 | 9081 | io_uring_try_cancel_requests(ctx, task, NULL); |
fdaf083c JA |
9082 | |
9083 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
9084 | atomic_dec(&task->io_uring->in_idle); | |
9085 | /* | |
9086 | * If the files that are going away are the ones in the thread | |
9087 | * identity, clear them out. | |
9088 | */ | |
9089 | if (task->io_uring->identity->files == files) | |
9090 | task->io_uring->identity->files = NULL; | |
9091 | io_sq_thread_unpark(ctx->sq_data); | |
9092 | } | |
0f212204 JA |
9093 | } |
9094 | ||
9095 | /* | |
9096 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9097 | */ | |
fdaf083c | 9098 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 9099 | { |
236434c3 | 9100 | struct io_uring_task *tctx = current->io_uring; |
a528b04e | 9101 | int ret; |
236434c3 MWO |
9102 | |
9103 | if (unlikely(!tctx)) { | |
0f212204 JA |
9104 | ret = io_uring_alloc_task_context(current); |
9105 | if (unlikely(ret)) | |
9106 | return ret; | |
236434c3 | 9107 | tctx = current->io_uring; |
0f212204 | 9108 | } |
236434c3 MWO |
9109 | if (tctx->last != file) { |
9110 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 9111 | |
236434c3 | 9112 | if (!old) { |
0f212204 | 9113 | get_file(file); |
a528b04e PB |
9114 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)file, |
9115 | file, GFP_KERNEL)); | |
9116 | if (ret) { | |
9117 | fput(file); | |
9118 | return ret; | |
9119 | } | |
ecfc8492 PB |
9120 | |
9121 | /* one and only SQPOLL file note, held by sqo_task */ | |
9122 | WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && | |
9123 | current != ctx->sqo_task); | |
0f212204 | 9124 | } |
236434c3 | 9125 | tctx->last = file; |
0f212204 JA |
9126 | } |
9127 | ||
fdaf083c JA |
9128 | /* |
9129 | * This is race safe in that the task itself is doing this, hence it | |
9130 | * cannot be going through the exit/cancel paths at the same time. | |
9131 | * This cannot be modified while exit/cancel is running. | |
9132 | */ | |
9133 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
9134 | tctx->sqpoll = true; | |
9135 | ||
0f212204 JA |
9136 | return 0; |
9137 | } | |
9138 | ||
9139 | /* | |
9140 | * Remove this io_uring_file -> task mapping. | |
9141 | */ | |
9142 | static void io_uring_del_task_file(struct file *file) | |
9143 | { | |
9144 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
9145 | |
9146 | if (tctx->last == file) | |
9147 | tctx->last = NULL; | |
5e2ed8c4 | 9148 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
9149 | if (file) |
9150 | fput(file); | |
9151 | } | |
9152 | ||
de7f1d9e PB |
9153 | static void io_uring_remove_task_files(struct io_uring_task *tctx) |
9154 | { | |
9155 | struct file *file; | |
9156 | unsigned long index; | |
9157 | ||
9158 | xa_for_each(&tctx->xa, index, file) | |
9159 | io_uring_del_task_file(file); | |
9160 | } | |
9161 | ||
0f212204 JA |
9162 | void __io_uring_files_cancel(struct files_struct *files) |
9163 | { | |
9164 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
9165 | struct file *file; |
9166 | unsigned long index; | |
0f212204 JA |
9167 | |
9168 | /* make sure overflow events are dropped */ | |
fdaf083c | 9169 | atomic_inc(&tctx->in_idle); |
de7f1d9e PB |
9170 | xa_for_each(&tctx->xa, index, file) |
9171 | io_uring_cancel_task_requests(file->private_data, files); | |
fdaf083c | 9172 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9173 | |
9174 | if (files) | |
9175 | io_uring_remove_task_files(tctx); | |
fdaf083c JA |
9176 | } |
9177 | ||
9178 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
9179 | { | |
0e9ddb39 PB |
9180 | return percpu_counter_sum(&tctx->inflight); |
9181 | } | |
fdaf083c | 9182 | |
0e9ddb39 PB |
9183 | static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx) |
9184 | { | |
9185 | struct io_uring_task *tctx; | |
9186 | s64 inflight; | |
9187 | DEFINE_WAIT(wait); | |
fdaf083c | 9188 | |
0e9ddb39 PB |
9189 | if (!ctx->sq_data) |
9190 | return; | |
9191 | tctx = ctx->sq_data->thread->io_uring; | |
9192 | io_disable_sqo_submit(ctx); | |
fdaf083c | 9193 | |
0e9ddb39 PB |
9194 | atomic_inc(&tctx->in_idle); |
9195 | do { | |
9196 | /* read completions before cancelations */ | |
9197 | inflight = tctx_inflight(tctx); | |
9198 | if (!inflight) | |
9199 | break; | |
9200 | io_uring_cancel_task_requests(ctx, NULL); | |
fdaf083c | 9201 | |
0e9ddb39 PB |
9202 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
9203 | /* | |
9204 | * If we've seen completions, retry without waiting. This | |
9205 | * avoids a race where a completion comes in before we did | |
9206 | * prepare_to_wait(). | |
9207 | */ | |
9208 | if (inflight == tctx_inflight(tctx)) | |
9209 | schedule(); | |
9210 | finish_wait(&tctx->wait, &wait); | |
9211 | } while (1); | |
9212 | atomic_dec(&tctx->in_idle); | |
0f212204 JA |
9213 | } |
9214 | ||
0f212204 JA |
9215 | /* |
9216 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
9217 | * requests. | |
9218 | */ | |
9219 | void __io_uring_task_cancel(void) | |
9220 | { | |
9221 | struct io_uring_task *tctx = current->io_uring; | |
9222 | DEFINE_WAIT(wait); | |
d8a6df10 | 9223 | s64 inflight; |
0f212204 JA |
9224 | |
9225 | /* make sure overflow events are dropped */ | |
fdaf083c | 9226 | atomic_inc(&tctx->in_idle); |
0f212204 | 9227 | |
0b5cd6c3 | 9228 | /* trigger io_disable_sqo_submit() */ |
0e9ddb39 PB |
9229 | if (tctx->sqpoll) { |
9230 | struct file *file; | |
9231 | unsigned long index; | |
9232 | ||
9233 | xa_for_each(&tctx->xa, index, file) | |
9234 | io_uring_cancel_sqpoll(file->private_data); | |
9235 | } | |
0b5cd6c3 | 9236 | |
d8a6df10 | 9237 | do { |
0f212204 | 9238 | /* read completions before cancelations */ |
fdaf083c | 9239 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9240 | if (!inflight) |
9241 | break; | |
0f212204 JA |
9242 | __io_uring_files_cancel(NULL); |
9243 | ||
9244 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9245 | ||
9246 | /* | |
a1bb3cd5 PB |
9247 | * If we've seen completions, retry without waiting. This |
9248 | * avoids a race where a completion comes in before we did | |
9249 | * prepare_to_wait(). | |
0f212204 | 9250 | */ |
a1bb3cd5 PB |
9251 | if (inflight == tctx_inflight(tctx)) |
9252 | schedule(); | |
f57555ed | 9253 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9254 | } while (1); |
0f212204 | 9255 | |
fdaf083c | 9256 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9257 | |
9258 | io_uring_remove_task_files(tctx); | |
44e728b8 PB |
9259 | } |
9260 | ||
fcb323cc JA |
9261 | static int io_uring_flush(struct file *file, void *data) |
9262 | { | |
6b5733eb | 9263 | struct io_uring_task *tctx = current->io_uring; |
d9d05217 | 9264 | struct io_ring_ctx *ctx = file->private_data; |
6b5733eb | 9265 | |
84965ff8 JA |
9266 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
9267 | io_uring_cancel_task_requests(ctx, NULL); | |
9268 | ||
6b5733eb | 9269 | if (!tctx) |
4f793dc4 PB |
9270 | return 0; |
9271 | ||
6b5733eb PB |
9272 | /* we should have cancelled and erased it before PF_EXITING */ |
9273 | WARN_ON_ONCE((current->flags & PF_EXITING) && | |
9274 | xa_load(&tctx->xa, (unsigned long)file)); | |
9275 | ||
4f793dc4 PB |
9276 | /* |
9277 | * fput() is pending, will be 2 if the only other ref is our potential | |
9278 | * task file note. If the task is exiting, drop regardless of count. | |
9279 | */ | |
6b5733eb PB |
9280 | if (atomic_long_read(&file->f_count) != 2) |
9281 | return 0; | |
4f793dc4 | 9282 | |
d9d05217 PB |
9283 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
9284 | /* there is only one file note, which is owned by sqo_task */ | |
4325cb49 PB |
9285 | WARN_ON_ONCE(ctx->sqo_task != current && |
9286 | xa_load(&tctx->xa, (unsigned long)file)); | |
9287 | /* sqo_dead check is for when this happens after cancellation */ | |
9288 | WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead && | |
d9d05217 PB |
9289 | !xa_load(&tctx->xa, (unsigned long)file)); |
9290 | ||
9291 | io_disable_sqo_submit(ctx); | |
9292 | } | |
9293 | ||
9294 | if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current) | |
9295 | io_uring_del_task_file(file); | |
fcb323cc JA |
9296 | return 0; |
9297 | } | |
9298 | ||
6c5c240e RP |
9299 | static void *io_uring_validate_mmap_request(struct file *file, |
9300 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9301 | { |
2b188cc1 | 9302 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9303 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9304 | struct page *page; |
9305 | void *ptr; | |
9306 | ||
9307 | switch (offset) { | |
9308 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9309 | case IORING_OFF_CQ_RING: |
9310 | ptr = ctx->rings; | |
2b188cc1 JA |
9311 | break; |
9312 | case IORING_OFF_SQES: | |
9313 | ptr = ctx->sq_sqes; | |
9314 | break; | |
2b188cc1 | 9315 | default: |
6c5c240e | 9316 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9317 | } |
9318 | ||
9319 | page = virt_to_head_page(ptr); | |
a50b854e | 9320 | if (sz > page_size(page)) |
6c5c240e RP |
9321 | return ERR_PTR(-EINVAL); |
9322 | ||
9323 | return ptr; | |
9324 | } | |
9325 | ||
9326 | #ifdef CONFIG_MMU | |
9327 | ||
9328 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9329 | { | |
9330 | size_t sz = vma->vm_end - vma->vm_start; | |
9331 | unsigned long pfn; | |
9332 | void *ptr; | |
9333 | ||
9334 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9335 | if (IS_ERR(ptr)) | |
9336 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9337 | |
9338 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9339 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9340 | } | |
9341 | ||
6c5c240e RP |
9342 | #else /* !CONFIG_MMU */ |
9343 | ||
9344 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9345 | { | |
9346 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9347 | } | |
9348 | ||
9349 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9350 | { | |
9351 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9352 | } | |
9353 | ||
9354 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9355 | unsigned long addr, unsigned long len, | |
9356 | unsigned long pgoff, unsigned long flags) | |
9357 | { | |
9358 | void *ptr; | |
9359 | ||
9360 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9361 | if (IS_ERR(ptr)) | |
9362 | return PTR_ERR(ptr); | |
9363 | ||
9364 | return (unsigned long) ptr; | |
9365 | } | |
9366 | ||
9367 | #endif /* !CONFIG_MMU */ | |
9368 | ||
d9d05217 | 9369 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 | 9370 | { |
d9d05217 | 9371 | int ret = 0; |
90554200 JA |
9372 | DEFINE_WAIT(wait); |
9373 | ||
9374 | do { | |
9375 | if (!io_sqring_full(ctx)) | |
9376 | break; | |
9377 | ||
9378 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9379 | ||
d9d05217 PB |
9380 | if (unlikely(ctx->sqo_dead)) { |
9381 | ret = -EOWNERDEAD; | |
9382 | goto out; | |
9383 | } | |
9384 | ||
90554200 JA |
9385 | if (!io_sqring_full(ctx)) |
9386 | break; | |
9387 | ||
9388 | schedule(); | |
9389 | } while (!signal_pending(current)); | |
9390 | ||
9391 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
d9d05217 PB |
9392 | out: |
9393 | return ret; | |
90554200 JA |
9394 | } |
9395 | ||
c73ebb68 HX |
9396 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9397 | struct __kernel_timespec __user **ts, | |
9398 | const sigset_t __user **sig) | |
9399 | { | |
9400 | struct io_uring_getevents_arg arg; | |
9401 | ||
9402 | /* | |
9403 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9404 | * is just a pointer to the sigset_t. | |
9405 | */ | |
9406 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9407 | *sig = (const sigset_t __user *) argp; | |
9408 | *ts = NULL; | |
9409 | return 0; | |
9410 | } | |
9411 | ||
9412 | /* | |
9413 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9414 | * timespec and sigset_t pointers if good. | |
9415 | */ | |
9416 | if (*argsz != sizeof(arg)) | |
9417 | return -EINVAL; | |
9418 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9419 | return -EFAULT; | |
9420 | *sig = u64_to_user_ptr(arg.sigmask); | |
9421 | *argsz = arg.sigmask_sz; | |
9422 | *ts = u64_to_user_ptr(arg.ts); | |
9423 | return 0; | |
9424 | } | |
9425 | ||
2b188cc1 | 9426 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9427 | u32, min_complete, u32, flags, const void __user *, argp, |
9428 | size_t, argsz) | |
2b188cc1 JA |
9429 | { |
9430 | struct io_ring_ctx *ctx; | |
9431 | long ret = -EBADF; | |
9432 | int submitted = 0; | |
9433 | struct fd f; | |
9434 | ||
4c6e277c | 9435 | io_run_task_work(); |
b41e9852 | 9436 | |
90554200 | 9437 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9438 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9439 | return -EINVAL; |
9440 | ||
9441 | f = fdget(fd); | |
9442 | if (!f.file) | |
9443 | return -EBADF; | |
9444 | ||
9445 | ret = -EOPNOTSUPP; | |
9446 | if (f.file->f_op != &io_uring_fops) | |
9447 | goto out_fput; | |
9448 | ||
9449 | ret = -ENXIO; | |
9450 | ctx = f.file->private_data; | |
9451 | if (!percpu_ref_tryget(&ctx->refs)) | |
9452 | goto out_fput; | |
9453 | ||
7e84e1c7 SG |
9454 | ret = -EBADFD; |
9455 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9456 | goto out; | |
9457 | ||
6c271ce2 JA |
9458 | /* |
9459 | * For SQ polling, the thread will do all submissions and completions. | |
9460 | * Just return the requested submit count, and wake the thread if | |
9461 | * we were asked to. | |
9462 | */ | |
b2a9eada | 9463 | ret = 0; |
6c271ce2 | 9464 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c503150 | 9465 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
89448c47 | 9466 | |
d9d05217 PB |
9467 | ret = -EOWNERDEAD; |
9468 | if (unlikely(ctx->sqo_dead)) | |
9469 | goto out; | |
6c271ce2 | 9470 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9471 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9472 | if (flags & IORING_ENTER_SQ_WAIT) { |
9473 | ret = io_sqpoll_wait_sq(ctx); | |
9474 | if (ret) | |
9475 | goto out; | |
9476 | } | |
6c271ce2 | 9477 | submitted = to_submit; |
b2a9eada | 9478 | } else if (to_submit) { |
fdaf083c | 9479 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9480 | if (unlikely(ret)) |
9481 | goto out; | |
2b188cc1 | 9482 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9483 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9484 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9485 | |
9486 | if (submitted != to_submit) | |
9487 | goto out; | |
2b188cc1 JA |
9488 | } |
9489 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9490 | const sigset_t __user *sig; |
9491 | struct __kernel_timespec __user *ts; | |
9492 | ||
9493 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9494 | if (unlikely(ret)) | |
9495 | goto out; | |
9496 | ||
2b188cc1 JA |
9497 | min_complete = min(min_complete, ctx->cq_entries); |
9498 | ||
32b2244a XW |
9499 | /* |
9500 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9501 | * space applications don't need to do io completion events | |
9502 | * polling again, they can rely on io_sq_thread to do polling | |
9503 | * work, which can reduce cpu usage and uring_lock contention. | |
9504 | */ | |
9505 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9506 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9507 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9508 | } else { |
c73ebb68 | 9509 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9510 | } |
2b188cc1 JA |
9511 | } |
9512 | ||
7c504e65 | 9513 | out: |
6805b32e | 9514 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9515 | out_fput: |
9516 | fdput(f); | |
9517 | return submitted ? submitted : ret; | |
9518 | } | |
9519 | ||
bebdb65e | 9520 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9521 | static int io_uring_show_cred(int id, void *p, void *data) |
9522 | { | |
6b47ab81 JA |
9523 | struct io_identity *iod = p; |
9524 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9525 | struct seq_file *m = data; |
9526 | struct user_namespace *uns = seq_user_ns(m); | |
9527 | struct group_info *gi; | |
9528 | kernel_cap_t cap; | |
9529 | unsigned __capi; | |
9530 | int g; | |
9531 | ||
9532 | seq_printf(m, "%5d\n", id); | |
9533 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9534 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9535 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9536 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9537 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9538 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9539 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9540 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9541 | seq_puts(m, "\n\tGroups:\t"); | |
9542 | gi = cred->group_info; | |
9543 | for (g = 0; g < gi->ngroups; g++) { | |
9544 | seq_put_decimal_ull(m, g ? " " : "", | |
9545 | from_kgid_munged(uns, gi->gid[g])); | |
9546 | } | |
9547 | seq_puts(m, "\n\tCapEff:\t"); | |
9548 | cap = cred->cap_effective; | |
9549 | CAP_FOR_EACH_U32(__capi) | |
9550 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9551 | seq_putc(m, '\n'); | |
9552 | return 0; | |
9553 | } | |
9554 | ||
9555 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9556 | { | |
dbbe9c64 | 9557 | struct io_sq_data *sq = NULL; |
fad8e0de | 9558 | bool has_lock; |
87ce955b JA |
9559 | int i; |
9560 | ||
fad8e0de JA |
9561 | /* |
9562 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9563 | * since fdinfo case grabs it in the opposite direction of normal use | |
9564 | * cases. If we fail to get the lock, we just don't iterate any | |
9565 | * structures that could be going away outside the io_uring mutex. | |
9566 | */ | |
9567 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9568 | ||
dbbe9c64 JQ |
9569 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9570 | sq = ctx->sq_data; | |
9571 | ||
9572 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9573 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9574 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9575 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
ea64ec02 | 9576 | struct file *f = *io_fixed_file_slot(ctx->file_data, i); |
87ce955b | 9577 | |
87ce955b JA |
9578 | if (f) |
9579 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9580 | else | |
9581 | seq_printf(m, "%5u: <none>\n", i); | |
9582 | } | |
9583 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9584 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9585 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9586 | ||
9587 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9588 | (unsigned int) buf->len); | |
9589 | } | |
fad8e0de | 9590 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9591 | seq_printf(m, "Personalities:\n"); |
9592 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9593 | } | |
d7718a9d JA |
9594 | seq_printf(m, "PollList:\n"); |
9595 | spin_lock_irq(&ctx->completion_lock); | |
9596 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9597 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9598 | struct io_kiocb *req; | |
9599 | ||
9600 | hlist_for_each_entry(req, list, hash_node) | |
9601 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9602 | req->task->task_works != NULL); | |
9603 | } | |
9604 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9605 | if (has_lock) |
9606 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9607 | } |
9608 | ||
9609 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9610 | { | |
9611 | struct io_ring_ctx *ctx = f->private_data; | |
9612 | ||
9613 | if (percpu_ref_tryget(&ctx->refs)) { | |
9614 | __io_uring_show_fdinfo(ctx, m); | |
9615 | percpu_ref_put(&ctx->refs); | |
9616 | } | |
9617 | } | |
bebdb65e | 9618 | #endif |
87ce955b | 9619 | |
2b188cc1 JA |
9620 | static const struct file_operations io_uring_fops = { |
9621 | .release = io_uring_release, | |
fcb323cc | 9622 | .flush = io_uring_flush, |
2b188cc1 | 9623 | .mmap = io_uring_mmap, |
6c5c240e RP |
9624 | #ifndef CONFIG_MMU |
9625 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9626 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9627 | #endif | |
2b188cc1 JA |
9628 | .poll = io_uring_poll, |
9629 | .fasync = io_uring_fasync, | |
bebdb65e | 9630 | #ifdef CONFIG_PROC_FS |
87ce955b | 9631 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9632 | #endif |
2b188cc1 JA |
9633 | }; |
9634 | ||
9635 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9636 | struct io_uring_params *p) | |
9637 | { | |
75b28aff HV |
9638 | struct io_rings *rings; |
9639 | size_t size, sq_array_offset; | |
2b188cc1 | 9640 | |
bd740481 JA |
9641 | /* make sure these are sane, as we already accounted them */ |
9642 | ctx->sq_entries = p->sq_entries; | |
9643 | ctx->cq_entries = p->cq_entries; | |
9644 | ||
75b28aff HV |
9645 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9646 | if (size == SIZE_MAX) | |
9647 | return -EOVERFLOW; | |
9648 | ||
9649 | rings = io_mem_alloc(size); | |
9650 | if (!rings) | |
2b188cc1 JA |
9651 | return -ENOMEM; |
9652 | ||
75b28aff HV |
9653 | ctx->rings = rings; |
9654 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9655 | rings->sq_ring_mask = p->sq_entries - 1; | |
9656 | rings->cq_ring_mask = p->cq_entries - 1; | |
9657 | rings->sq_ring_entries = p->sq_entries; | |
9658 | rings->cq_ring_entries = p->cq_entries; | |
9659 | ctx->sq_mask = rings->sq_ring_mask; | |
9660 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9661 | |
9662 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9663 | if (size == SIZE_MAX) { |
9664 | io_mem_free(ctx->rings); | |
9665 | ctx->rings = NULL; | |
2b188cc1 | 9666 | return -EOVERFLOW; |
eb065d30 | 9667 | } |
2b188cc1 JA |
9668 | |
9669 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9670 | if (!ctx->sq_sqes) { |
9671 | io_mem_free(ctx->rings); | |
9672 | ctx->rings = NULL; | |
2b188cc1 | 9673 | return -ENOMEM; |
eb065d30 | 9674 | } |
2b188cc1 | 9675 | |
2b188cc1 JA |
9676 | return 0; |
9677 | } | |
9678 | ||
9faadcc8 PB |
9679 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9680 | { | |
9681 | int ret, fd; | |
9682 | ||
9683 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9684 | if (fd < 0) | |
9685 | return fd; | |
9686 | ||
9687 | ret = io_uring_add_task_file(ctx, file); | |
9688 | if (ret) { | |
9689 | put_unused_fd(fd); | |
9690 | return ret; | |
9691 | } | |
9692 | fd_install(fd, file); | |
9693 | return fd; | |
9694 | } | |
9695 | ||
2b188cc1 JA |
9696 | /* |
9697 | * Allocate an anonymous fd, this is what constitutes the application | |
9698 | * visible backing of an io_uring instance. The application mmaps this | |
9699 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9700 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9701 | */ | |
9faadcc8 | 9702 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9703 | { |
9704 | struct file *file; | |
9faadcc8 | 9705 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9706 | int ret; |
9707 | ||
2b188cc1 JA |
9708 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9709 | &ctx->ring_sock); | |
9710 | if (ret) | |
9faadcc8 | 9711 | return ERR_PTR(ret); |
2b188cc1 JA |
9712 | #endif |
9713 | ||
2b188cc1 JA |
9714 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9715 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9716 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9717 | if (IS_ERR(file)) { |
9718 | sock_release(ctx->ring_sock); | |
9719 | ctx->ring_sock = NULL; | |
9720 | } else { | |
9721 | ctx->ring_sock->file = file; | |
0f212204 | 9722 | } |
2b188cc1 | 9723 | #endif |
9faadcc8 | 9724 | return file; |
2b188cc1 JA |
9725 | } |
9726 | ||
7f13657d XW |
9727 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9728 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9729 | { |
9730 | struct user_struct *user = NULL; | |
9731 | struct io_ring_ctx *ctx; | |
9faadcc8 | 9732 | struct file *file; |
2b188cc1 JA |
9733 | int ret; |
9734 | ||
8110c1a6 | 9735 | if (!entries) |
2b188cc1 | 9736 | return -EINVAL; |
8110c1a6 JA |
9737 | if (entries > IORING_MAX_ENTRIES) { |
9738 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9739 | return -EINVAL; | |
9740 | entries = IORING_MAX_ENTRIES; | |
9741 | } | |
2b188cc1 JA |
9742 | |
9743 | /* | |
9744 | * Use twice as many entries for the CQ ring. It's possible for the | |
9745 | * application to drive a higher depth than the size of the SQ ring, | |
9746 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9747 | * some flexibility in overcommitting a bit. If the application has |
9748 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9749 | * of CQ ring entries manually. | |
2b188cc1 JA |
9750 | */ |
9751 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9752 | if (p->flags & IORING_SETUP_CQSIZE) { |
9753 | /* | |
9754 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9755 | * to a power-of-two, if it isn't already. We do NOT impose | |
9756 | * any cq vs sq ring sizing. | |
9757 | */ | |
eb2667b3 | 9758 | if (!p->cq_entries) |
33a107f0 | 9759 | return -EINVAL; |
8110c1a6 JA |
9760 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9761 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9762 | return -EINVAL; | |
9763 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9764 | } | |
eb2667b3 JQ |
9765 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9766 | if (p->cq_entries < p->sq_entries) | |
9767 | return -EINVAL; | |
33a107f0 JA |
9768 | } else { |
9769 | p->cq_entries = 2 * p->sq_entries; | |
9770 | } | |
2b188cc1 JA |
9771 | |
9772 | user = get_uid(current_user()); | |
2b188cc1 JA |
9773 | |
9774 | ctx = io_ring_ctx_alloc(p); | |
9775 | if (!ctx) { | |
2b188cc1 JA |
9776 | free_uid(user); |
9777 | return -ENOMEM; | |
9778 | } | |
9779 | ctx->compat = in_compat_syscall(); | |
26bfa89e | 9780 | ctx->limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9781 | ctx->user = user; |
0b8c0ec7 | 9782 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9783 | #ifdef CONFIG_AUDIT |
9784 | ctx->loginuid = current->loginuid; | |
9785 | ctx->sessionid = current->sessionid; | |
9786 | #endif | |
2aede0e4 JA |
9787 | ctx->sqo_task = get_task_struct(current); |
9788 | ||
9789 | /* | |
9790 | * This is just grabbed for accounting purposes. When a process exits, | |
9791 | * the mm is exited and dropped before the files, hence we need to hang | |
9792 | * on to this mm purely for the purposes of being able to unaccount | |
9793 | * memory (locked/pinned vm). It's not used for anything else. | |
9794 | */ | |
6b7898eb | 9795 | mmgrab(current->mm); |
2aede0e4 | 9796 | ctx->mm_account = current->mm; |
6b7898eb | 9797 | |
91d8f519 DZ |
9798 | #ifdef CONFIG_BLK_CGROUP |
9799 | /* | |
9800 | * The sq thread will belong to the original cgroup it was inited in. | |
9801 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9802 | * issued bios will be associated with the closest cgroup later in the | |
9803 | * block layer. | |
9804 | */ | |
9805 | rcu_read_lock(); | |
9806 | ctx->sqo_blkcg_css = blkcg_css(); | |
9807 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9808 | rcu_read_unlock(); | |
9809 | if (!ret) { | |
9810 | /* don't init against a dying cgroup, have the user try again */ | |
9811 | ctx->sqo_blkcg_css = NULL; | |
9812 | ret = -ENODEV; | |
9813 | goto err; | |
9814 | } | |
9815 | #endif | |
2b188cc1 JA |
9816 | ret = io_allocate_scq_urings(ctx, p); |
9817 | if (ret) | |
9818 | goto err; | |
9819 | ||
7e84e1c7 | 9820 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9821 | if (ret) |
9822 | goto err; | |
9823 | ||
7e84e1c7 SG |
9824 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9825 | io_sq_offload_start(ctx); | |
9826 | ||
2b188cc1 | 9827 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9828 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9829 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9830 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9831 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9832 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9833 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9834 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9835 | |
9836 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9837 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9838 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9839 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9840 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9841 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9842 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9843 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9844 | |
7f13657d XW |
9845 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9846 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9847 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9848 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9849 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9850 | |
9851 | if (copy_to_user(params, p, sizeof(*p))) { | |
9852 | ret = -EFAULT; | |
9853 | goto err; | |
9854 | } | |
d1719f70 | 9855 | |
9faadcc8 PB |
9856 | file = io_uring_get_file(ctx); |
9857 | if (IS_ERR(file)) { | |
9858 | ret = PTR_ERR(file); | |
9859 | goto err; | |
9860 | } | |
9861 | ||
044c1ab3 JA |
9862 | /* |
9863 | * Install ring fd as the very last thing, so we don't risk someone | |
9864 | * having closed it before we finish setup | |
9865 | */ | |
9faadcc8 PB |
9866 | ret = io_uring_install_fd(ctx, file); |
9867 | if (ret < 0) { | |
06585c49 | 9868 | io_disable_sqo_submit(ctx); |
9faadcc8 PB |
9869 | /* fput will clean it up */ |
9870 | fput(file); | |
9871 | return ret; | |
9872 | } | |
044c1ab3 | 9873 | |
c826bd7a | 9874 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9875 | return ret; |
9876 | err: | |
d9d05217 | 9877 | io_disable_sqo_submit(ctx); |
2b188cc1 JA |
9878 | io_ring_ctx_wait_and_kill(ctx); |
9879 | return ret; | |
9880 | } | |
9881 | ||
9882 | /* | |
9883 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9884 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9885 | * params structure passed in. | |
9886 | */ | |
9887 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9888 | { | |
9889 | struct io_uring_params p; | |
2b188cc1 JA |
9890 | int i; |
9891 | ||
9892 | if (copy_from_user(&p, params, sizeof(p))) | |
9893 | return -EFAULT; | |
9894 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9895 | if (p.resv[i]) | |
9896 | return -EINVAL; | |
9897 | } | |
9898 | ||
6c271ce2 | 9899 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9900 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9901 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9902 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9903 | return -EINVAL; |
9904 | ||
7f13657d | 9905 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9906 | } |
9907 | ||
9908 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9909 | struct io_uring_params __user *, params) | |
9910 | { | |
9911 | return io_uring_setup(entries, params); | |
9912 | } | |
9913 | ||
66f4af93 JA |
9914 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9915 | { | |
9916 | struct io_uring_probe *p; | |
9917 | size_t size; | |
9918 | int i, ret; | |
9919 | ||
9920 | size = struct_size(p, ops, nr_args); | |
9921 | if (size == SIZE_MAX) | |
9922 | return -EOVERFLOW; | |
9923 | p = kzalloc(size, GFP_KERNEL); | |
9924 | if (!p) | |
9925 | return -ENOMEM; | |
9926 | ||
9927 | ret = -EFAULT; | |
9928 | if (copy_from_user(p, arg, size)) | |
9929 | goto out; | |
9930 | ret = -EINVAL; | |
9931 | if (memchr_inv(p, 0, size)) | |
9932 | goto out; | |
9933 | ||
9934 | p->last_op = IORING_OP_LAST - 1; | |
9935 | if (nr_args > IORING_OP_LAST) | |
9936 | nr_args = IORING_OP_LAST; | |
9937 | ||
9938 | for (i = 0; i < nr_args; i++) { | |
9939 | p->ops[i].op = i; | |
9940 | if (!io_op_defs[i].not_supported) | |
9941 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9942 | } | |
9943 | p->ops_len = i; | |
9944 | ||
9945 | ret = 0; | |
9946 | if (copy_to_user(arg, p, size)) | |
9947 | ret = -EFAULT; | |
9948 | out: | |
9949 | kfree(p); | |
9950 | return ret; | |
9951 | } | |
9952 | ||
071698e1 JA |
9953 | static int io_register_personality(struct io_ring_ctx *ctx) |
9954 | { | |
1e6fa521 JA |
9955 | struct io_identity *id; |
9956 | int ret; | |
071698e1 | 9957 | |
1e6fa521 JA |
9958 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9959 | if (unlikely(!id)) | |
9960 | return -ENOMEM; | |
9961 | ||
9962 | io_init_identity(id); | |
9963 | id->creds = get_current_cred(); | |
9964 | ||
9965 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9966 | if (ret < 0) { | |
9967 | put_cred(id->creds); | |
9968 | kfree(id); | |
9969 | } | |
9970 | return ret; | |
071698e1 JA |
9971 | } |
9972 | ||
21b55dbc SG |
9973 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9974 | unsigned int nr_args) | |
9975 | { | |
9976 | struct io_uring_restriction *res; | |
9977 | size_t size; | |
9978 | int i, ret; | |
9979 | ||
7e84e1c7 SG |
9980 | /* Restrictions allowed only if rings started disabled */ |
9981 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9982 | return -EBADFD; | |
9983 | ||
21b55dbc | 9984 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9985 | if (ctx->restrictions.registered) |
21b55dbc SG |
9986 | return -EBUSY; |
9987 | ||
9988 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9989 | return -EINVAL; | |
9990 | ||
9991 | size = array_size(nr_args, sizeof(*res)); | |
9992 | if (size == SIZE_MAX) | |
9993 | return -EOVERFLOW; | |
9994 | ||
9995 | res = memdup_user(arg, size); | |
9996 | if (IS_ERR(res)) | |
9997 | return PTR_ERR(res); | |
9998 | ||
9999 | ret = 0; | |
10000 | ||
10001 | for (i = 0; i < nr_args; i++) { | |
10002 | switch (res[i].opcode) { | |
10003 | case IORING_RESTRICTION_REGISTER_OP: | |
10004 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10005 | ret = -EINVAL; | |
10006 | goto out; | |
10007 | } | |
10008 | ||
10009 | __set_bit(res[i].register_op, | |
10010 | ctx->restrictions.register_op); | |
10011 | break; | |
10012 | case IORING_RESTRICTION_SQE_OP: | |
10013 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10014 | ret = -EINVAL; | |
10015 | goto out; | |
10016 | } | |
10017 | ||
10018 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10019 | break; | |
10020 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10021 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10022 | break; | |
10023 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10024 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10025 | break; | |
10026 | default: | |
10027 | ret = -EINVAL; | |
10028 | goto out; | |
10029 | } | |
10030 | } | |
10031 | ||
10032 | out: | |
10033 | /* Reset all restrictions if an error happened */ | |
10034 | if (ret != 0) | |
10035 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10036 | else | |
7e84e1c7 | 10037 | ctx->restrictions.registered = true; |
21b55dbc SG |
10038 | |
10039 | kfree(res); | |
10040 | return ret; | |
10041 | } | |
10042 | ||
7e84e1c7 SG |
10043 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10044 | { | |
10045 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10046 | return -EBADFD; | |
10047 | ||
10048 | if (ctx->restrictions.registered) | |
10049 | ctx->restricted = 1; | |
10050 | ||
10051 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
10052 | ||
10053 | io_sq_offload_start(ctx); | |
10054 | ||
10055 | return 0; | |
10056 | } | |
10057 | ||
071698e1 JA |
10058 | static bool io_register_op_must_quiesce(int op) |
10059 | { | |
10060 | switch (op) { | |
10061 | case IORING_UNREGISTER_FILES: | |
10062 | case IORING_REGISTER_FILES_UPDATE: | |
10063 | case IORING_REGISTER_PROBE: | |
10064 | case IORING_REGISTER_PERSONALITY: | |
10065 | case IORING_UNREGISTER_PERSONALITY: | |
10066 | return false; | |
10067 | default: | |
10068 | return true; | |
10069 | } | |
10070 | } | |
10071 | ||
edafccee JA |
10072 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10073 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10074 | __releases(ctx->uring_lock) |
10075 | __acquires(ctx->uring_lock) | |
edafccee JA |
10076 | { |
10077 | int ret; | |
10078 | ||
35fa71a0 JA |
10079 | /* |
10080 | * We're inside the ring mutex, if the ref is already dying, then | |
10081 | * someone else killed the ctx or is already going through | |
10082 | * io_uring_register(). | |
10083 | */ | |
10084 | if (percpu_ref_is_dying(&ctx->refs)) | |
10085 | return -ENXIO; | |
10086 | ||
071698e1 | 10087 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10088 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 10089 | |
05f3fb3c JA |
10090 | /* |
10091 | * Drop uring mutex before waiting for references to exit. If | |
10092 | * another thread is currently inside io_uring_enter() it might | |
10093 | * need to grab the uring_lock to make progress. If we hold it | |
10094 | * here across the drain wait, then we can deadlock. It's safe | |
10095 | * to drop the mutex here, since no new references will come in | |
10096 | * after we've killed the percpu ref. | |
10097 | */ | |
10098 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
10099 | do { |
10100 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10101 | if (!ret) | |
10102 | break; | |
ed6930c9 JA |
10103 | ret = io_run_task_work_sig(); |
10104 | if (ret < 0) | |
10105 | break; | |
af9c1a44 JA |
10106 | } while (1); |
10107 | ||
05f3fb3c | 10108 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 10109 | |
c150368b JA |
10110 | if (ret) { |
10111 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
10112 | goto out_quiesce; |
10113 | } | |
10114 | } | |
10115 | ||
10116 | if (ctx->restricted) { | |
10117 | if (opcode >= IORING_REGISTER_LAST) { | |
10118 | ret = -EINVAL; | |
10119 | goto out; | |
10120 | } | |
10121 | ||
10122 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
10123 | ret = -EACCES; | |
c150368b JA |
10124 | goto out; |
10125 | } | |
05f3fb3c | 10126 | } |
edafccee JA |
10127 | |
10128 | switch (opcode) { | |
10129 | case IORING_REGISTER_BUFFERS: | |
0a96bbe4 | 10130 | ret = io_sqe_buffers_register(ctx, arg, nr_args); |
edafccee JA |
10131 | break; |
10132 | case IORING_UNREGISTER_BUFFERS: | |
10133 | ret = -EINVAL; | |
10134 | if (arg || nr_args) | |
10135 | break; | |
0a96bbe4 | 10136 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10137 | break; |
6b06314c JA |
10138 | case IORING_REGISTER_FILES: |
10139 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
10140 | break; | |
10141 | case IORING_UNREGISTER_FILES: | |
10142 | ret = -EINVAL; | |
10143 | if (arg || nr_args) | |
10144 | break; | |
10145 | ret = io_sqe_files_unregister(ctx); | |
10146 | break; | |
c3a31e60 JA |
10147 | case IORING_REGISTER_FILES_UPDATE: |
10148 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
10149 | break; | |
9b402849 | 10150 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10151 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10152 | ret = -EINVAL; |
10153 | if (nr_args != 1) | |
10154 | break; | |
10155 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10156 | if (ret) |
10157 | break; | |
10158 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10159 | ctx->eventfd_async = 1; | |
10160 | else | |
10161 | ctx->eventfd_async = 0; | |
9b402849 JA |
10162 | break; |
10163 | case IORING_UNREGISTER_EVENTFD: | |
10164 | ret = -EINVAL; | |
10165 | if (arg || nr_args) | |
10166 | break; | |
10167 | ret = io_eventfd_unregister(ctx); | |
10168 | break; | |
66f4af93 JA |
10169 | case IORING_REGISTER_PROBE: |
10170 | ret = -EINVAL; | |
10171 | if (!arg || nr_args > 256) | |
10172 | break; | |
10173 | ret = io_probe(ctx, arg, nr_args); | |
10174 | break; | |
071698e1 JA |
10175 | case IORING_REGISTER_PERSONALITY: |
10176 | ret = -EINVAL; | |
10177 | if (arg || nr_args) | |
10178 | break; | |
10179 | ret = io_register_personality(ctx); | |
10180 | break; | |
10181 | case IORING_UNREGISTER_PERSONALITY: | |
10182 | ret = -EINVAL; | |
10183 | if (arg) | |
10184 | break; | |
10185 | ret = io_unregister_personality(ctx, nr_args); | |
10186 | break; | |
7e84e1c7 SG |
10187 | case IORING_REGISTER_ENABLE_RINGS: |
10188 | ret = -EINVAL; | |
10189 | if (arg || nr_args) | |
10190 | break; | |
10191 | ret = io_register_enable_rings(ctx); | |
10192 | break; | |
21b55dbc SG |
10193 | case IORING_REGISTER_RESTRICTIONS: |
10194 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10195 | break; | |
edafccee JA |
10196 | default: |
10197 | ret = -EINVAL; | |
10198 | break; | |
10199 | } | |
10200 | ||
21b55dbc | 10201 | out: |
071698e1 | 10202 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10203 | /* bring the ctx back to life */ |
05f3fb3c | 10204 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 10205 | out_quiesce: |
0f158b4c | 10206 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10207 | } |
edafccee JA |
10208 | return ret; |
10209 | } | |
10210 | ||
10211 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10212 | void __user *, arg, unsigned int, nr_args) | |
10213 | { | |
10214 | struct io_ring_ctx *ctx; | |
10215 | long ret = -EBADF; | |
10216 | struct fd f; | |
10217 | ||
10218 | f = fdget(fd); | |
10219 | if (!f.file) | |
10220 | return -EBADF; | |
10221 | ||
10222 | ret = -EOPNOTSUPP; | |
10223 | if (f.file->f_op != &io_uring_fops) | |
10224 | goto out_fput; | |
10225 | ||
10226 | ctx = f.file->private_data; | |
10227 | ||
10228 | mutex_lock(&ctx->uring_lock); | |
10229 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10230 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10231 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10232 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10233 | out_fput: |
10234 | fdput(f); | |
10235 | return ret; | |
10236 | } | |
10237 | ||
2b188cc1 JA |
10238 | static int __init io_uring_init(void) |
10239 | { | |
d7f62e82 SM |
10240 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10241 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10242 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10243 | } while (0) | |
10244 | ||
10245 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10246 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10247 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10248 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10249 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10250 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10251 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10252 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10253 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10254 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10255 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10256 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10257 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10258 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10259 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10260 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10261 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10262 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10263 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10264 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10265 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10266 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10267 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10268 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10269 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10270 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10271 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10272 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10273 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
10274 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 10275 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10276 | |
d3656344 | 10277 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10278 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
91f245d5 JA |
10279 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10280 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10281 | return 0; |
10282 | }; | |
10283 | __initcall(io_uring_init); |