]>
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 | ||
edafccee JA |
190 | struct io_mapped_ubuf { |
191 | u64 ubuf; | |
192 | size_t len; | |
193 | struct bio_vec *bvec; | |
194 | unsigned int nr_bvecs; | |
de293938 | 195 | unsigned long acct_pages; |
edafccee JA |
196 | }; |
197 | ||
65e19f54 JA |
198 | struct fixed_file_table { |
199 | struct file **files; | |
31b51510 JA |
200 | }; |
201 | ||
05589553 XW |
202 | struct fixed_file_ref_node { |
203 | struct percpu_ref refs; | |
204 | struct list_head node; | |
205 | struct list_head file_list; | |
206 | struct fixed_file_data *file_data; | |
4a38aed2 | 207 | struct llist_node llist; |
e297822b | 208 | bool done; |
05589553 XW |
209 | }; |
210 | ||
05f3fb3c JA |
211 | struct fixed_file_data { |
212 | struct fixed_file_table *table; | |
213 | struct io_ring_ctx *ctx; | |
214 | ||
b2e96852 | 215 | struct fixed_file_ref_node *node; |
05f3fb3c | 216 | struct percpu_ref refs; |
05f3fb3c | 217 | struct completion done; |
05589553 XW |
218 | struct list_head ref_list; |
219 | spinlock_t lock; | |
05f3fb3c JA |
220 | }; |
221 | ||
5a2e745d JA |
222 | struct io_buffer { |
223 | struct list_head list; | |
224 | __u64 addr; | |
225 | __s32 len; | |
226 | __u16 bid; | |
227 | }; | |
228 | ||
21b55dbc SG |
229 | struct io_restriction { |
230 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
231 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
232 | u8 sqe_flags_allowed; | |
233 | u8 sqe_flags_required; | |
7e84e1c7 | 234 | bool registered; |
21b55dbc SG |
235 | }; |
236 | ||
534ca6d6 JA |
237 | struct io_sq_data { |
238 | refcount_t refs; | |
69fb2131 JA |
239 | struct mutex lock; |
240 | ||
241 | /* ctx's that are using this sqd */ | |
242 | struct list_head ctx_list; | |
243 | struct list_head ctx_new_list; | |
244 | struct mutex ctx_lock; | |
245 | ||
534ca6d6 JA |
246 | struct task_struct *thread; |
247 | struct wait_queue_head wait; | |
248 | }; | |
249 | ||
2b188cc1 JA |
250 | struct io_ring_ctx { |
251 | struct { | |
252 | struct percpu_ref refs; | |
253 | } ____cacheline_aligned_in_smp; | |
254 | ||
255 | struct { | |
256 | unsigned int flags; | |
e1d85334 | 257 | unsigned int compat: 1; |
aad5d8da | 258 | unsigned int limit_mem: 1; |
e1d85334 RD |
259 | unsigned int cq_overflow_flushed: 1; |
260 | unsigned int drain_next: 1; | |
261 | unsigned int eventfd_async: 1; | |
21b55dbc | 262 | unsigned int restricted: 1; |
2b188cc1 | 263 | |
75b28aff HV |
264 | /* |
265 | * Ring buffer of indices into array of io_uring_sqe, which is | |
266 | * mmapped by the application using the IORING_OFF_SQES offset. | |
267 | * | |
268 | * This indirection could e.g. be used to assign fixed | |
269 | * io_uring_sqe entries to operations and only submit them to | |
270 | * the queue when needed. | |
271 | * | |
272 | * The kernel modifies neither the indices array nor the entries | |
273 | * array. | |
274 | */ | |
275 | u32 *sq_array; | |
2b188cc1 JA |
276 | unsigned cached_sq_head; |
277 | unsigned sq_entries; | |
278 | unsigned sq_mask; | |
6c271ce2 | 279 | unsigned sq_thread_idle; |
498ccd9e | 280 | unsigned cached_sq_dropped; |
2c3bac6d | 281 | unsigned cached_cq_overflow; |
ad3eb2c8 | 282 | unsigned long sq_check_overflow; |
de0617e4 JA |
283 | |
284 | struct list_head defer_list; | |
5262f567 | 285 | struct list_head timeout_list; |
1d7bb1d5 | 286 | struct list_head cq_overflow_list; |
fcb323cc JA |
287 | |
288 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 289 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
290 | } ____cacheline_aligned_in_smp; |
291 | ||
206aefde JA |
292 | struct io_rings *rings; |
293 | ||
2b188cc1 | 294 | /* IO offload */ |
561fb04a | 295 | struct io_wq *io_wq; |
2aede0e4 JA |
296 | |
297 | /* | |
298 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
299 | * have access to the ->files | |
300 | */ | |
301 | struct task_struct *sqo_task; | |
302 | ||
303 | /* Only used for accounting purposes */ | |
304 | struct mm_struct *mm_account; | |
305 | ||
91d8f519 DZ |
306 | #ifdef CONFIG_BLK_CGROUP |
307 | struct cgroup_subsys_state *sqo_blkcg_css; | |
308 | #endif | |
309 | ||
534ca6d6 JA |
310 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
311 | ||
90554200 | 312 | struct wait_queue_head sqo_sq_wait; |
6a779382 | 313 | struct wait_queue_entry sqo_wait_entry; |
69fb2131 | 314 | struct list_head sqd_list; |
75b28aff | 315 | |
6b06314c JA |
316 | /* |
317 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
318 | * readers must ensure that ->refs is alive as long as the file* is | |
319 | * used. Only updated through io_uring_register(2). | |
320 | */ | |
05f3fb3c | 321 | struct fixed_file_data *file_data; |
6b06314c JA |
322 | unsigned nr_user_files; |
323 | ||
edafccee JA |
324 | /* if used, fixed mapped user buffers */ |
325 | unsigned nr_user_bufs; | |
326 | struct io_mapped_ubuf *user_bufs; | |
327 | ||
2b188cc1 JA |
328 | struct user_struct *user; |
329 | ||
0b8c0ec7 | 330 | const struct cred *creds; |
181e448d | 331 | |
4ea33a97 JA |
332 | #ifdef CONFIG_AUDIT |
333 | kuid_t loginuid; | |
334 | unsigned int sessionid; | |
335 | #endif | |
336 | ||
0f158b4c JA |
337 | struct completion ref_comp; |
338 | struct completion sq_thread_comp; | |
206aefde | 339 | |
0ddf92e8 JA |
340 | /* if all else fails... */ |
341 | struct io_kiocb *fallback_req; | |
342 | ||
206aefde JA |
343 | #if defined(CONFIG_UNIX) |
344 | struct socket *ring_sock; | |
345 | #endif | |
346 | ||
5a2e745d JA |
347 | struct idr io_buffer_idr; |
348 | ||
071698e1 JA |
349 | struct idr personality_idr; |
350 | ||
206aefde JA |
351 | struct { |
352 | unsigned cached_cq_tail; | |
353 | unsigned cq_entries; | |
354 | unsigned cq_mask; | |
355 | atomic_t cq_timeouts; | |
ad3eb2c8 | 356 | unsigned long cq_check_overflow; |
206aefde JA |
357 | struct wait_queue_head cq_wait; |
358 | struct fasync_struct *cq_fasync; | |
359 | struct eventfd_ctx *cq_ev_fd; | |
360 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
361 | |
362 | struct { | |
363 | struct mutex uring_lock; | |
364 | wait_queue_head_t wait; | |
365 | } ____cacheline_aligned_in_smp; | |
366 | ||
367 | struct { | |
368 | spinlock_t completion_lock; | |
e94f141b | 369 | |
def596e9 | 370 | /* |
540e32a0 | 371 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
372 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
373 | * For SQPOLL, only the single threaded io_sq_thread() will | |
374 | * manipulate the list, hence no extra locking is needed there. | |
375 | */ | |
540e32a0 | 376 | struct list_head iopoll_list; |
78076bb6 JA |
377 | struct hlist_head *cancel_hash; |
378 | unsigned cancel_hash_bits; | |
e94f141b | 379 | bool poll_multi_file; |
31b51510 | 380 | |
fcb323cc JA |
381 | spinlock_t inflight_lock; |
382 | struct list_head inflight_list; | |
2b188cc1 | 383 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 384 | |
4a38aed2 JA |
385 | struct delayed_work file_put_work; |
386 | struct llist_head file_put_llist; | |
387 | ||
85faa7b8 | 388 | struct work_struct exit_work; |
21b55dbc | 389 | struct io_restriction restrictions; |
2b188cc1 JA |
390 | }; |
391 | ||
09bb8394 JA |
392 | /* |
393 | * First field must be the file pointer in all the | |
394 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
395 | */ | |
221c5eb2 JA |
396 | struct io_poll_iocb { |
397 | struct file *file; | |
018043be | 398 | struct wait_queue_head *head; |
221c5eb2 | 399 | __poll_t events; |
8c838788 | 400 | bool done; |
221c5eb2 | 401 | bool canceled; |
392edb45 | 402 | struct wait_queue_entry wait; |
221c5eb2 JA |
403 | }; |
404 | ||
018043be PB |
405 | struct io_poll_remove { |
406 | struct file *file; | |
407 | u64 addr; | |
408 | }; | |
409 | ||
b5dba59e JA |
410 | struct io_close { |
411 | struct file *file; | |
412 | struct file *put_file; | |
413 | int fd; | |
414 | }; | |
415 | ||
ad8a48ac JA |
416 | struct io_timeout_data { |
417 | struct io_kiocb *req; | |
418 | struct hrtimer timer; | |
419 | struct timespec64 ts; | |
420 | enum hrtimer_mode mode; | |
421 | }; | |
422 | ||
8ed8d3c3 JA |
423 | struct io_accept { |
424 | struct file *file; | |
425 | struct sockaddr __user *addr; | |
426 | int __user *addr_len; | |
427 | int flags; | |
09952e3e | 428 | unsigned long nofile; |
8ed8d3c3 JA |
429 | }; |
430 | ||
431 | struct io_sync { | |
432 | struct file *file; | |
433 | loff_t len; | |
434 | loff_t off; | |
435 | int flags; | |
d63d1b5e | 436 | int mode; |
8ed8d3c3 JA |
437 | }; |
438 | ||
fbf23849 JA |
439 | struct io_cancel { |
440 | struct file *file; | |
441 | u64 addr; | |
442 | }; | |
443 | ||
b29472ee JA |
444 | struct io_timeout { |
445 | struct file *file; | |
bfe68a22 PB |
446 | u32 off; |
447 | u32 target_seq; | |
135fcde8 | 448 | struct list_head list; |
90cd7e42 PB |
449 | /* head of the link, used by linked timeouts only */ |
450 | struct io_kiocb *head; | |
b29472ee JA |
451 | }; |
452 | ||
0bdf7a2d PB |
453 | struct io_timeout_rem { |
454 | struct file *file; | |
455 | u64 addr; | |
456 | }; | |
457 | ||
9adbd45d JA |
458 | struct io_rw { |
459 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
460 | struct kiocb kiocb; | |
461 | u64 addr; | |
462 | u64 len; | |
463 | }; | |
464 | ||
3fbb51c1 JA |
465 | struct io_connect { |
466 | struct file *file; | |
467 | struct sockaddr __user *addr; | |
468 | int addr_len; | |
469 | }; | |
470 | ||
e47293fd JA |
471 | struct io_sr_msg { |
472 | struct file *file; | |
fddaface | 473 | union { |
270a5940 | 474 | struct user_msghdr __user *umsg; |
fddaface JA |
475 | void __user *buf; |
476 | }; | |
e47293fd | 477 | int msg_flags; |
bcda7baa | 478 | int bgid; |
fddaface | 479 | size_t len; |
bcda7baa | 480 | struct io_buffer *kbuf; |
e47293fd JA |
481 | }; |
482 | ||
15b71abe JA |
483 | struct io_open { |
484 | struct file *file; | |
485 | int dfd; | |
944d1444 | 486 | bool ignore_nonblock; |
15b71abe | 487 | struct filename *filename; |
c12cedf2 | 488 | struct open_how how; |
4022e7af | 489 | unsigned long nofile; |
15b71abe JA |
490 | }; |
491 | ||
05f3fb3c JA |
492 | struct io_files_update { |
493 | struct file *file; | |
494 | u64 arg; | |
495 | u32 nr_args; | |
496 | u32 offset; | |
497 | }; | |
498 | ||
4840e418 JA |
499 | struct io_fadvise { |
500 | struct file *file; | |
501 | u64 offset; | |
502 | u32 len; | |
503 | u32 advice; | |
504 | }; | |
505 | ||
c1ca757b JA |
506 | struct io_madvise { |
507 | struct file *file; | |
508 | u64 addr; | |
509 | u32 len; | |
510 | u32 advice; | |
511 | }; | |
512 | ||
3e4827b0 JA |
513 | struct io_epoll { |
514 | struct file *file; | |
515 | int epfd; | |
516 | int op; | |
517 | int fd; | |
518 | struct epoll_event event; | |
e47293fd JA |
519 | }; |
520 | ||
7d67af2c PB |
521 | struct io_splice { |
522 | struct file *file_out; | |
523 | struct file *file_in; | |
524 | loff_t off_out; | |
525 | loff_t off_in; | |
526 | u64 len; | |
527 | unsigned int flags; | |
528 | }; | |
529 | ||
ddf0322d JA |
530 | struct io_provide_buf { |
531 | struct file *file; | |
532 | __u64 addr; | |
533 | __s32 len; | |
534 | __u32 bgid; | |
535 | __u16 nbufs; | |
536 | __u16 bid; | |
537 | }; | |
538 | ||
1d9e1288 BM |
539 | struct io_statx { |
540 | struct file *file; | |
541 | int dfd; | |
542 | unsigned int mask; | |
543 | unsigned int flags; | |
e62753e4 | 544 | const char __user *filename; |
1d9e1288 BM |
545 | struct statx __user *buffer; |
546 | }; | |
547 | ||
36f4fa68 JA |
548 | struct io_shutdown { |
549 | struct file *file; | |
550 | int how; | |
551 | }; | |
552 | ||
80a261fd JA |
553 | struct io_rename { |
554 | struct file *file; | |
555 | int old_dfd; | |
556 | int new_dfd; | |
557 | struct filename *oldpath; | |
558 | struct filename *newpath; | |
559 | int flags; | |
560 | }; | |
561 | ||
14a1143b JA |
562 | struct io_unlink { |
563 | struct file *file; | |
564 | int dfd; | |
565 | int flags; | |
566 | struct filename *filename; | |
567 | }; | |
568 | ||
3ca405eb PB |
569 | struct io_completion { |
570 | struct file *file; | |
571 | struct list_head list; | |
0f7e466b | 572 | int cflags; |
3ca405eb PB |
573 | }; |
574 | ||
f499a021 JA |
575 | struct io_async_connect { |
576 | struct sockaddr_storage address; | |
577 | }; | |
578 | ||
03b1230c JA |
579 | struct io_async_msghdr { |
580 | struct iovec fast_iov[UIO_FASTIOV]; | |
581 | struct iovec *iov; | |
582 | struct sockaddr __user *uaddr; | |
583 | struct msghdr msg; | |
b537916c | 584 | struct sockaddr_storage addr; |
03b1230c JA |
585 | }; |
586 | ||
f67676d1 JA |
587 | struct io_async_rw { |
588 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
589 | const struct iovec *free_iovec; |
590 | struct iov_iter iter; | |
227c0c96 | 591 | size_t bytes_done; |
bcf5a063 | 592 | struct wait_page_queue wpq; |
f67676d1 JA |
593 | }; |
594 | ||
6b47ee6e PB |
595 | enum { |
596 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
597 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
598 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
599 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
600 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 601 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 602 | |
6b47ee6e PB |
603 | REQ_F_FAIL_LINK_BIT, |
604 | REQ_F_INFLIGHT_BIT, | |
605 | REQ_F_CUR_POS_BIT, | |
606 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 607 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 608 | REQ_F_ISREG_BIT, |
99bc4c38 | 609 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 610 | REQ_F_POLLED_BIT, |
bcda7baa | 611 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 612 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 613 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 614 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
615 | |
616 | /* not a real bit, just to check we're not overflowing the space */ | |
617 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
618 | }; |
619 | ||
620 | enum { | |
621 | /* ctx owns file */ | |
622 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
623 | /* drain existing IO first */ | |
624 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
625 | /* linked sqes */ | |
626 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
627 | /* doesn't sever on completion < 0 */ | |
628 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
629 | /* IOSQE_ASYNC */ | |
630 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
631 | /* IOSQE_BUFFER_SELECT */ |
632 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 633 | |
6b47ee6e PB |
634 | /* fail rest of links */ |
635 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
636 | /* on inflight list */ | |
637 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
638 | /* read/write uses file position */ | |
639 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
640 | /* must not punt to workers */ | |
641 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 642 | /* has or had linked timeout */ |
6b47ee6e | 643 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
644 | /* regular file */ |
645 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
646 | /* needs cleanup */ |
647 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
648 | /* already went through poll handler */ |
649 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
650 | /* buffer already selected */ |
651 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
652 | /* doesn't need file table for this request */ |
653 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
654 | /* io_wq_work is initialized */ |
655 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
656 | /* linked timeout is active, i.e. prepared by link's head */ |
657 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
658 | }; |
659 | ||
660 | struct async_poll { | |
661 | struct io_poll_iocb poll; | |
807abcb0 | 662 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
663 | }; |
664 | ||
09bb8394 JA |
665 | /* |
666 | * NOTE! Each of the iocb union members has the file pointer | |
667 | * as the first entry in their struct definition. So you can | |
668 | * access the file pointer through any of the sub-structs, | |
669 | * or directly as just 'ki_filp' in this struct. | |
670 | */ | |
2b188cc1 | 671 | struct io_kiocb { |
221c5eb2 | 672 | union { |
09bb8394 | 673 | struct file *file; |
9adbd45d | 674 | struct io_rw rw; |
221c5eb2 | 675 | struct io_poll_iocb poll; |
018043be | 676 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
677 | struct io_accept accept; |
678 | struct io_sync sync; | |
fbf23849 | 679 | struct io_cancel cancel; |
b29472ee | 680 | struct io_timeout timeout; |
0bdf7a2d | 681 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 682 | struct io_connect connect; |
e47293fd | 683 | struct io_sr_msg sr_msg; |
15b71abe | 684 | struct io_open open; |
b5dba59e | 685 | struct io_close close; |
05f3fb3c | 686 | struct io_files_update files_update; |
4840e418 | 687 | struct io_fadvise fadvise; |
c1ca757b | 688 | struct io_madvise madvise; |
3e4827b0 | 689 | struct io_epoll epoll; |
7d67af2c | 690 | struct io_splice splice; |
ddf0322d | 691 | struct io_provide_buf pbuf; |
1d9e1288 | 692 | struct io_statx statx; |
36f4fa68 | 693 | struct io_shutdown shutdown; |
80a261fd | 694 | struct io_rename rename; |
14a1143b | 695 | struct io_unlink unlink; |
3ca405eb PB |
696 | /* use only after cleaning per-op data, see io_clean_op() */ |
697 | struct io_completion compl; | |
221c5eb2 | 698 | }; |
2b188cc1 | 699 | |
e8c2bc1f JA |
700 | /* opcode allocated if it needs to store data for async defer */ |
701 | void *async_data; | |
d625c6ee | 702 | u8 opcode; |
65a6543d XW |
703 | /* polled IO has completed */ |
704 | u8 iopoll_completed; | |
2b188cc1 | 705 | |
4f4eeba8 | 706 | u16 buf_index; |
9cf7c104 | 707 | u32 result; |
4f4eeba8 | 708 | |
010e8e6b PB |
709 | struct io_ring_ctx *ctx; |
710 | unsigned int flags; | |
711 | refcount_t refs; | |
712 | struct task_struct *task; | |
713 | u64 user_data; | |
d7718a9d | 714 | |
f2f87370 | 715 | struct io_kiocb *link; |
0415767e | 716 | struct percpu_ref *fixed_file_refs; |
fcb323cc | 717 | |
d21ffe7e PB |
718 | /* |
719 | * 1. used with ctx->iopoll_list with reads/writes | |
720 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
721 | */ | |
010e8e6b | 722 | struct list_head inflight_entry; |
010e8e6b PB |
723 | struct callback_head task_work; |
724 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
725 | struct hlist_node hash_node; | |
726 | struct async_poll *apoll; | |
727 | struct io_wq_work work; | |
2b188cc1 | 728 | }; |
05589553 | 729 | |
27dc8338 PB |
730 | struct io_defer_entry { |
731 | struct list_head list; | |
732 | struct io_kiocb *req; | |
9cf7c104 | 733 | u32 seq; |
2b188cc1 JA |
734 | }; |
735 | ||
def596e9 | 736 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 737 | |
013538bd JA |
738 | struct io_comp_state { |
739 | unsigned int nr; | |
740 | struct list_head list; | |
741 | struct io_ring_ctx *ctx; | |
742 | }; | |
743 | ||
9a56a232 JA |
744 | struct io_submit_state { |
745 | struct blk_plug plug; | |
746 | ||
2579f913 JA |
747 | /* |
748 | * io_kiocb alloc cache | |
749 | */ | |
750 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 751 | unsigned int free_reqs; |
2579f913 | 752 | |
27926b68 JA |
753 | bool plug_started; |
754 | ||
013538bd JA |
755 | /* |
756 | * Batch completion logic | |
757 | */ | |
758 | struct io_comp_state comp; | |
759 | ||
9a56a232 JA |
760 | /* |
761 | * File reference cache | |
762 | */ | |
763 | struct file *file; | |
764 | unsigned int fd; | |
765 | unsigned int has_refs; | |
9a56a232 JA |
766 | unsigned int ios_left; |
767 | }; | |
768 | ||
d3656344 | 769 | struct io_op_def { |
d3656344 JA |
770 | /* needs req->file assigned */ |
771 | unsigned needs_file : 1; | |
fd2206e4 JA |
772 | /* don't fail if file grab fails */ |
773 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
774 | /* hash wq insertion if file is a regular file */ |
775 | unsigned hash_reg_file : 1; | |
776 | /* unbound wq insertion if file is a non-regular file */ | |
777 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
778 | /* opcode is not supported by this kernel */ |
779 | unsigned not_supported : 1; | |
8a72758c JA |
780 | /* set if opcode supports polled "wait" */ |
781 | unsigned pollin : 1; | |
782 | unsigned pollout : 1; | |
bcda7baa JA |
783 | /* op supports buffer selection */ |
784 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
785 | /* must always have async data allocated */ |
786 | unsigned needs_async_data : 1; | |
27926b68 JA |
787 | /* should block plug */ |
788 | unsigned plug : 1; | |
e8c2bc1f JA |
789 | /* size of async data needed, if any */ |
790 | unsigned short async_size; | |
0f203765 | 791 | unsigned work_flags; |
d3656344 JA |
792 | }; |
793 | ||
0918682b | 794 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
795 | [IORING_OP_NOP] = {}, |
796 | [IORING_OP_READV] = { | |
d3656344 JA |
797 | .needs_file = 1, |
798 | .unbound_nonreg_file = 1, | |
8a72758c | 799 | .pollin = 1, |
4d954c25 | 800 | .buffer_select = 1, |
e8c2bc1f | 801 | .needs_async_data = 1, |
27926b68 | 802 | .plug = 1, |
e8c2bc1f | 803 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 804 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 805 | }, |
0463b6c5 | 806 | [IORING_OP_WRITEV] = { |
d3656344 JA |
807 | .needs_file = 1, |
808 | .hash_reg_file = 1, | |
809 | .unbound_nonreg_file = 1, | |
8a72758c | 810 | .pollout = 1, |
e8c2bc1f | 811 | .needs_async_data = 1, |
27926b68 | 812 | .plug = 1, |
e8c2bc1f | 813 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
814 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
815 | IO_WQ_WORK_FSIZE, | |
d3656344 | 816 | }, |
0463b6c5 | 817 | [IORING_OP_FSYNC] = { |
d3656344 | 818 | .needs_file = 1, |
0f203765 | 819 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 820 | }, |
0463b6c5 | 821 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
822 | .needs_file = 1, |
823 | .unbound_nonreg_file = 1, | |
8a72758c | 824 | .pollin = 1, |
27926b68 | 825 | .plug = 1, |
e8c2bc1f | 826 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 827 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 828 | }, |
0463b6c5 | 829 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
830 | .needs_file = 1, |
831 | .hash_reg_file = 1, | |
832 | .unbound_nonreg_file = 1, | |
8a72758c | 833 | .pollout = 1, |
27926b68 | 834 | .plug = 1, |
e8c2bc1f | 835 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
836 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
837 | IO_WQ_WORK_MM, | |
d3656344 | 838 | }, |
0463b6c5 | 839 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
840 | .needs_file = 1, |
841 | .unbound_nonreg_file = 1, | |
842 | }, | |
0463b6c5 PB |
843 | [IORING_OP_POLL_REMOVE] = {}, |
844 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 845 | .needs_file = 1, |
0f203765 | 846 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 847 | }, |
0463b6c5 | 848 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
849 | .needs_file = 1, |
850 | .unbound_nonreg_file = 1, | |
8a72758c | 851 | .pollout = 1, |
e8c2bc1f JA |
852 | .needs_async_data = 1, |
853 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
854 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
855 | IO_WQ_WORK_FS, | |
d3656344 | 856 | }, |
0463b6c5 | 857 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
858 | .needs_file = 1, |
859 | .unbound_nonreg_file = 1, | |
8a72758c | 860 | .pollin = 1, |
52de1fe1 | 861 | .buffer_select = 1, |
e8c2bc1f JA |
862 | .needs_async_data = 1, |
863 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
864 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
865 | IO_WQ_WORK_FS, | |
d3656344 | 866 | }, |
0463b6c5 | 867 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
868 | .needs_async_data = 1, |
869 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 870 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 871 | }, |
0463b6c5 PB |
872 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
873 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
874 | .needs_file = 1, |
875 | .unbound_nonreg_file = 1, | |
8a72758c | 876 | .pollin = 1, |
0f203765 | 877 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 878 | }, |
0463b6c5 PB |
879 | [IORING_OP_ASYNC_CANCEL] = {}, |
880 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
881 | .needs_async_data = 1, |
882 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 883 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 884 | }, |
0463b6c5 | 885 | [IORING_OP_CONNECT] = { |
d3656344 JA |
886 | .needs_file = 1, |
887 | .unbound_nonreg_file = 1, | |
8a72758c | 888 | .pollout = 1, |
e8c2bc1f JA |
889 | .needs_async_data = 1, |
890 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 891 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 892 | }, |
0463b6c5 | 893 | [IORING_OP_FALLOCATE] = { |
d3656344 | 894 | .needs_file = 1, |
69228338 | 895 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 896 | }, |
0463b6c5 | 897 | [IORING_OP_OPENAT] = { |
0f203765 | 898 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 899 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 900 | }, |
0463b6c5 | 901 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
902 | .needs_file = 1, |
903 | .needs_file_no_error = 1, | |
0f203765 | 904 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 905 | }, |
0463b6c5 | 906 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 907 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 908 | }, |
0463b6c5 | 909 | [IORING_OP_STATX] = { |
0f203765 JA |
910 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
911 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 912 | }, |
0463b6c5 | 913 | [IORING_OP_READ] = { |
3a6820f2 JA |
914 | .needs_file = 1, |
915 | .unbound_nonreg_file = 1, | |
8a72758c | 916 | .pollin = 1, |
bcda7baa | 917 | .buffer_select = 1, |
27926b68 | 918 | .plug = 1, |
e8c2bc1f | 919 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 920 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 921 | }, |
0463b6c5 | 922 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
923 | .needs_file = 1, |
924 | .unbound_nonreg_file = 1, | |
8a72758c | 925 | .pollout = 1, |
27926b68 | 926 | .plug = 1, |
e8c2bc1f | 927 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
928 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
929 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 930 | }, |
0463b6c5 | 931 | [IORING_OP_FADVISE] = { |
4840e418 | 932 | .needs_file = 1, |
0f203765 | 933 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 934 | }, |
0463b6c5 | 935 | [IORING_OP_MADVISE] = { |
0f203765 | 936 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 937 | }, |
0463b6c5 | 938 | [IORING_OP_SEND] = { |
fddaface JA |
939 | .needs_file = 1, |
940 | .unbound_nonreg_file = 1, | |
8a72758c | 941 | .pollout = 1, |
0f203765 | 942 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 943 | }, |
0463b6c5 | 944 | [IORING_OP_RECV] = { |
fddaface JA |
945 | .needs_file = 1, |
946 | .unbound_nonreg_file = 1, | |
8a72758c | 947 | .pollin = 1, |
bcda7baa | 948 | .buffer_select = 1, |
0f203765 | 949 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 950 | }, |
0463b6c5 | 951 | [IORING_OP_OPENAT2] = { |
0f203765 | 952 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 953 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 954 | }, |
3e4827b0 JA |
955 | [IORING_OP_EPOLL_CTL] = { |
956 | .unbound_nonreg_file = 1, | |
0f203765 | 957 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 958 | }, |
7d67af2c PB |
959 | [IORING_OP_SPLICE] = { |
960 | .needs_file = 1, | |
961 | .hash_reg_file = 1, | |
962 | .unbound_nonreg_file = 1, | |
0f203765 | 963 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
964 | }, |
965 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 966 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
967 | [IORING_OP_TEE] = { |
968 | .needs_file = 1, | |
969 | .hash_reg_file = 1, | |
970 | .unbound_nonreg_file = 1, | |
971 | }, | |
36f4fa68 JA |
972 | [IORING_OP_SHUTDOWN] = { |
973 | .needs_file = 1, | |
974 | }, | |
80a261fd JA |
975 | [IORING_OP_RENAMEAT] = { |
976 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
977 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
978 | }, | |
14a1143b JA |
979 | [IORING_OP_UNLINKAT] = { |
980 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
981 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
982 | }, | |
d3656344 JA |
983 | }; |
984 | ||
2e0464d4 BM |
985 | enum io_mem_account { |
986 | ACCT_LOCKED, | |
987 | ACCT_PINNED, | |
988 | }; | |
989 | ||
81b68a5c PB |
990 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
991 | struct io_comp_state *cs); | |
78e19bbe | 992 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 993 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 994 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 995 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 996 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 997 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 998 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
999 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
1000 | struct io_uring_files_update *ip, | |
1001 | unsigned nr_args); | |
3ca405eb | 1002 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1003 | static struct file *io_file_get(struct io_submit_state *state, |
1004 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 1005 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 1006 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 1007 | |
b63534c4 JA |
1008 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
1009 | struct iovec **iovec, struct iov_iter *iter, | |
1010 | bool needs_lock); | |
ff6165b2 JA |
1011 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1012 | const struct iovec *fast_iov, | |
227c0c96 | 1013 | struct iov_iter *iter, bool force); |
de0617e4 | 1014 | |
2b188cc1 JA |
1015 | static struct kmem_cache *req_cachep; |
1016 | ||
0918682b | 1017 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1018 | |
1019 | struct sock *io_uring_get_socket(struct file *file) | |
1020 | { | |
1021 | #if defined(CONFIG_UNIX) | |
1022 | if (file->f_op == &io_uring_fops) { | |
1023 | struct io_ring_ctx *ctx = file->private_data; | |
1024 | ||
1025 | return ctx->ring_sock->sk; | |
1026 | } | |
1027 | #endif | |
1028 | return NULL; | |
1029 | } | |
1030 | EXPORT_SYMBOL(io_uring_get_socket); | |
1031 | ||
f2f87370 PB |
1032 | #define io_for_each_link(pos, head) \ |
1033 | for (pos = (head); pos; pos = pos->link) | |
1034 | ||
3ca405eb PB |
1035 | static inline void io_clean_op(struct io_kiocb *req) |
1036 | { | |
bb175342 PB |
1037 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1038 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
1039 | __io_clean_op(req); |
1040 | } | |
1041 | ||
08d23634 PB |
1042 | static bool io_match_task(struct io_kiocb *head, |
1043 | struct task_struct *task, | |
1044 | struct files_struct *files) | |
1045 | { | |
1046 | struct io_kiocb *req; | |
1047 | ||
1048 | if (task && head->task != task) | |
1049 | return false; | |
1050 | if (!files) | |
1051 | return true; | |
1052 | ||
1053 | io_for_each_link(req, head) { | |
1054 | if ((req->flags & REQ_F_WORK_INITIALIZED) && | |
1055 | (req->work.flags & IO_WQ_WORK_FILES) && | |
1056 | req->work.identity->files == files) | |
1057 | return true; | |
1058 | } | |
1059 | return false; | |
1060 | } | |
1061 | ||
28cea78a | 1062 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1063 | { |
28cea78a | 1064 | struct files_struct *files = current->files; |
c40f6379 JA |
1065 | struct mm_struct *mm = current->mm; |
1066 | ||
1067 | if (mm) { | |
1068 | kthread_unuse_mm(mm); | |
1069 | mmput(mm); | |
4b70cf9d | 1070 | current->mm = NULL; |
c40f6379 | 1071 | } |
28cea78a JA |
1072 | if (files) { |
1073 | struct nsproxy *nsproxy = current->nsproxy; | |
1074 | ||
1075 | task_lock(current); | |
1076 | current->files = NULL; | |
1077 | current->nsproxy = NULL; | |
1078 | task_unlock(current); | |
1079 | put_files_struct(files); | |
1080 | put_nsproxy(nsproxy); | |
1081 | } | |
1082 | } | |
1083 | ||
1a38ffc9 | 1084 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a JA |
1085 | { |
1086 | if (!current->files) { | |
1087 | struct files_struct *files; | |
1088 | struct nsproxy *nsproxy; | |
1089 | ||
1090 | task_lock(ctx->sqo_task); | |
1091 | files = ctx->sqo_task->files; | |
1092 | if (!files) { | |
1093 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1094 | return -EOWNERDEAD; |
28cea78a JA |
1095 | } |
1096 | atomic_inc(&files->count); | |
1097 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1098 | nsproxy = ctx->sqo_task->nsproxy; | |
1099 | task_unlock(ctx->sqo_task); | |
1100 | ||
1101 | task_lock(current); | |
1102 | current->files = files; | |
1103 | current->nsproxy = nsproxy; | |
1104 | task_unlock(current); | |
1105 | } | |
1a38ffc9 | 1106 | return 0; |
c40f6379 JA |
1107 | } |
1108 | ||
1109 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1110 | { | |
4b70cf9d JA |
1111 | struct mm_struct *mm; |
1112 | ||
1113 | if (current->mm) | |
1114 | return 0; | |
1115 | ||
1116 | /* Should never happen */ | |
1117 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1118 | return -EFAULT; | |
1119 | ||
1120 | task_lock(ctx->sqo_task); | |
1121 | mm = ctx->sqo_task->mm; | |
1122 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1123 | mm = NULL; | |
1124 | task_unlock(ctx->sqo_task); | |
1125 | ||
1126 | if (mm) { | |
1127 | kthread_use_mm(mm); | |
1128 | return 0; | |
c40f6379 JA |
1129 | } |
1130 | ||
4b70cf9d | 1131 | return -EFAULT; |
c40f6379 JA |
1132 | } |
1133 | ||
28cea78a JA |
1134 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1135 | struct io_kiocb *req) | |
c40f6379 | 1136 | { |
28cea78a | 1137 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1138 | int ret; |
28cea78a JA |
1139 | |
1140 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1141 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1142 | if (unlikely(ret)) |
1143 | return ret; | |
1144 | } | |
1145 | ||
1a38ffc9 PB |
1146 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1147 | ret = __io_sq_thread_acquire_files(ctx); | |
1148 | if (unlikely(ret)) | |
1149 | return ret; | |
1150 | } | |
28cea78a JA |
1151 | |
1152 | return 0; | |
c40f6379 JA |
1153 | } |
1154 | ||
91d8f519 DZ |
1155 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1156 | struct cgroup_subsys_state **cur_css) | |
1157 | ||
1158 | { | |
1159 | #ifdef CONFIG_BLK_CGROUP | |
1160 | /* puts the old one when swapping */ | |
1161 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1162 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1163 | *cur_css = ctx->sqo_blkcg_css; | |
1164 | } | |
1165 | #endif | |
1166 | } | |
1167 | ||
1168 | static void io_sq_thread_unassociate_blkcg(void) | |
1169 | { | |
1170 | #ifdef CONFIG_BLK_CGROUP | |
1171 | kthread_associate_blkcg(NULL); | |
1172 | #endif | |
1173 | } | |
1174 | ||
c40f6379 JA |
1175 | static inline void req_set_fail_links(struct io_kiocb *req) |
1176 | { | |
1177 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1178 | req->flags |= REQ_F_FAIL_LINK; | |
1179 | } | |
4a38aed2 | 1180 | |
1e6fa521 JA |
1181 | /* |
1182 | * None of these are dereferenced, they are simply used to check if any of | |
1183 | * them have changed. If we're under current and check they are still the | |
1184 | * same, we're fine to grab references to them for actual out-of-line use. | |
1185 | */ | |
1186 | static void io_init_identity(struct io_identity *id) | |
1187 | { | |
1188 | id->files = current->files; | |
1189 | id->mm = current->mm; | |
1190 | #ifdef CONFIG_BLK_CGROUP | |
1191 | rcu_read_lock(); | |
1192 | id->blkcg_css = blkcg_css(); | |
1193 | rcu_read_unlock(); | |
1194 | #endif | |
1195 | id->creds = current_cred(); | |
1196 | id->nsproxy = current->nsproxy; | |
1197 | id->fs = current->fs; | |
1198 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1199 | #ifdef CONFIG_AUDIT |
1200 | id->loginuid = current->loginuid; | |
1201 | id->sessionid = current->sessionid; | |
1202 | #endif | |
1e6fa521 JA |
1203 | refcount_set(&id->count, 1); |
1204 | } | |
1205 | ||
ec99ca6c PB |
1206 | static inline void __io_req_init_async(struct io_kiocb *req) |
1207 | { | |
1208 | memset(&req->work, 0, sizeof(req->work)); | |
1209 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1210 | } | |
1211 | ||
7cdaf587 XW |
1212 | /* |
1213 | * Note: must call io_req_init_async() for the first time you | |
1214 | * touch any members of io_wq_work. | |
1215 | */ | |
1216 | static inline void io_req_init_async(struct io_kiocb *req) | |
1217 | { | |
500a373d JA |
1218 | struct io_uring_task *tctx = current->io_uring; |
1219 | ||
7cdaf587 XW |
1220 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1221 | return; | |
1222 | ||
ec99ca6c | 1223 | __io_req_init_async(req); |
500a373d JA |
1224 | |
1225 | /* Grab a ref if this isn't our static identity */ | |
1226 | req->work.identity = tctx->identity; | |
1227 | if (tctx->identity != &tctx->__identity) | |
1228 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1229 | } |
1230 | ||
0cdaf760 PB |
1231 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1232 | { | |
1233 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1234 | } | |
1235 | ||
2b188cc1 JA |
1236 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1237 | { | |
1238 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1239 | ||
0f158b4c | 1240 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1241 | } |
1242 | ||
8eb7e2d0 PB |
1243 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1244 | { | |
1245 | return !req->timeout.off; | |
1246 | } | |
1247 | ||
2b188cc1 JA |
1248 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1249 | { | |
1250 | struct io_ring_ctx *ctx; | |
78076bb6 | 1251 | int hash_bits; |
2b188cc1 JA |
1252 | |
1253 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1254 | if (!ctx) | |
1255 | return NULL; | |
1256 | ||
0ddf92e8 JA |
1257 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1258 | if (!ctx->fallback_req) | |
1259 | goto err; | |
1260 | ||
78076bb6 JA |
1261 | /* |
1262 | * Use 5 bits less than the max cq entries, that should give us around | |
1263 | * 32 entries per hash list if totally full and uniformly spread. | |
1264 | */ | |
1265 | hash_bits = ilog2(p->cq_entries); | |
1266 | hash_bits -= 5; | |
1267 | if (hash_bits <= 0) | |
1268 | hash_bits = 1; | |
1269 | ctx->cancel_hash_bits = hash_bits; | |
1270 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1271 | GFP_KERNEL); | |
1272 | if (!ctx->cancel_hash) | |
1273 | goto err; | |
1274 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1275 | ||
21482896 | 1276 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1277 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1278 | goto err; | |
2b188cc1 JA |
1279 | |
1280 | ctx->flags = p->flags; | |
90554200 | 1281 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1282 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1283 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1284 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1285 | init_completion(&ctx->ref_comp); |
1286 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1287 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1288 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1289 | mutex_init(&ctx->uring_lock); |
1290 | init_waitqueue_head(&ctx->wait); | |
1291 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1292 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1293 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1294 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1295 | init_waitqueue_head(&ctx->inflight_wait); |
1296 | spin_lock_init(&ctx->inflight_lock); | |
1297 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1298 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1299 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1300 | return ctx; |
206aefde | 1301 | err: |
0ddf92e8 JA |
1302 | if (ctx->fallback_req) |
1303 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1304 | kfree(ctx->cancel_hash); |
206aefde JA |
1305 | kfree(ctx); |
1306 | return NULL; | |
2b188cc1 JA |
1307 | } |
1308 | ||
9cf7c104 | 1309 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1310 | { |
2bc9930e JA |
1311 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1312 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1313 | |
9cf7c104 | 1314 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1315 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1316 | } |
de0617e4 | 1317 | |
9d858b21 | 1318 | return false; |
de0617e4 JA |
1319 | } |
1320 | ||
de0617e4 | 1321 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1322 | { |
75b28aff | 1323 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1324 | |
07910158 PB |
1325 | /* order cqe stores with ring update */ |
1326 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1327 | |
07910158 PB |
1328 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1329 | wake_up_interruptible(&ctx->cq_wait); | |
1330 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1331 | } |
1332 | } | |
1333 | ||
5c3462cf | 1334 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1335 | { |
500a373d | 1336 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1337 | return; |
1338 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1339 | kfree(req->work.identity); | |
1340 | } | |
1341 | ||
4edf20f9 | 1342 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1343 | { |
7cdaf587 | 1344 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1345 | return; |
51a4cc11 JA |
1346 | |
1347 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1348 | |
dfead8a8 | 1349 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1350 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1351 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1352 | } |
91d8f519 | 1353 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1354 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1355 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1356 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1357 | } | |
91d8f519 | 1358 | #endif |
dfead8a8 | 1359 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1360 | put_cred(req->work.identity->creds); |
dfead8a8 | 1361 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1362 | } |
dfead8a8 | 1363 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1364 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1365 | |
98447d65 | 1366 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1367 | if (--fs->users) |
1368 | fs = NULL; | |
98447d65 | 1369 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1370 | if (fs) |
1371 | free_fs_struct(fs); | |
dfead8a8 | 1372 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1373 | } |
51a4cc11 | 1374 | |
5c3462cf | 1375 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1376 | } |
1377 | ||
1e6fa521 JA |
1378 | /* |
1379 | * Create a private copy of io_identity, since some fields don't match | |
1380 | * the current context. | |
1381 | */ | |
1382 | static bool io_identity_cow(struct io_kiocb *req) | |
1383 | { | |
5c3462cf | 1384 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1385 | const struct cred *creds = NULL; |
1386 | struct io_identity *id; | |
1387 | ||
1388 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1389 | creds = req->work.identity->creds; | |
1390 | ||
1391 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1392 | if (unlikely(!id)) { | |
1393 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1394 | return false; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * We can safely just re-init the creds we copied Either the field | |
1399 | * matches the current one, or we haven't grabbed it yet. The only | |
1400 | * exception is ->creds, through registered personalities, so handle | |
1401 | * that one separately. | |
1402 | */ | |
1403 | io_init_identity(id); | |
1404 | if (creds) | |
1405 | req->work.identity->creds = creds; | |
1406 | ||
1407 | /* add one for this request */ | |
1408 | refcount_inc(&id->count); | |
1409 | ||
cb8a8ae3 JA |
1410 | /* drop tctx and req identity references, if needed */ |
1411 | if (tctx->identity != &tctx->__identity && | |
1412 | refcount_dec_and_test(&tctx->identity->count)) | |
1413 | kfree(tctx->identity); | |
1414 | if (req->work.identity != &tctx->__identity && | |
1415 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1416 | kfree(req->work.identity); |
1417 | ||
1418 | req->work.identity = id; | |
500a373d | 1419 | tctx->identity = id; |
1e6fa521 JA |
1420 | return true; |
1421 | } | |
1422 | ||
1423 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1424 | { |
d3656344 | 1425 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1426 | struct io_identity *id = req->work.identity; |
23329513 | 1427 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1428 | |
69228338 JA |
1429 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1430 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1431 | return false; | |
1432 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1433 | } | |
16d59803 | 1434 | |
dfead8a8 | 1435 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1436 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1437 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1438 | if (id->files != current->files || |
1439 | id->nsproxy != current->nsproxy) | |
1440 | return false; | |
1441 | atomic_inc(&id->files->count); | |
1442 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1443 | req->flags |= REQ_F_INFLIGHT; |
1444 | ||
1445 | spin_lock_irq(&ctx->inflight_lock); | |
1446 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1447 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1448 | req->work.flags |= IO_WQ_WORK_FILES; |
dca9cf8b | 1449 | } |
91d8f519 | 1450 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1451 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1452 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1453 | rcu_read_lock(); |
1e6fa521 JA |
1454 | if (id->blkcg_css != blkcg_css()) { |
1455 | rcu_read_unlock(); | |
1456 | return false; | |
1457 | } | |
91d8f519 DZ |
1458 | /* |
1459 | * This should be rare, either the cgroup is dying or the task | |
1460 | * is moving cgroups. Just punt to root for the handful of ios. | |
1461 | */ | |
1e6fa521 | 1462 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1463 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1464 | rcu_read_unlock(); |
1465 | } | |
1466 | #endif | |
dfead8a8 | 1467 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1468 | if (id->creds != current_cred()) |
1469 | return false; | |
1470 | get_cred(id->creds); | |
dfead8a8 JA |
1471 | req->work.flags |= IO_WQ_WORK_CREDS; |
1472 | } | |
4ea33a97 JA |
1473 | #ifdef CONFIG_AUDIT |
1474 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1475 | current->sessionid != id->sessionid) | |
1476 | return false; | |
1477 | #endif | |
dfead8a8 JA |
1478 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1479 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1480 | if (current->fs != id->fs) |
1481 | return false; | |
1482 | spin_lock(&id->fs->lock); | |
1483 | if (!id->fs->in_exec) { | |
1484 | id->fs->users++; | |
dfead8a8 | 1485 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1486 | } else { |
1487 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1488 | } | |
1489 | spin_unlock(¤t->fs->lock); | |
1490 | } | |
1e6fa521 JA |
1491 | |
1492 | return true; | |
1493 | } | |
1494 | ||
1495 | static void io_prep_async_work(struct io_kiocb *req) | |
1496 | { | |
1497 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1498 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1499 | struct io_identity *id; |
1e6fa521 JA |
1500 | |
1501 | io_req_init_async(req); | |
5c3462cf | 1502 | id = req->work.identity; |
1e6fa521 | 1503 | |
feaadc4f PB |
1504 | if (req->flags & REQ_F_FORCE_ASYNC) |
1505 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1506 | ||
1e6fa521 JA |
1507 | if (req->flags & REQ_F_ISREG) { |
1508 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1509 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1510 | } else { | |
1511 | if (def->unbound_nonreg_file) | |
1512 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1513 | } | |
1514 | ||
1515 | /* ->mm can never change on us */ | |
1516 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1517 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1518 | mmgrab(id->mm); | |
1519 | req->work.flags |= IO_WQ_WORK_MM; | |
1520 | } | |
1521 | ||
1522 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1523 | if (io_grab_identity(req)) | |
1524 | return; | |
1525 | ||
1526 | if (!io_identity_cow(req)) | |
1527 | return; | |
1528 | ||
1529 | /* can't fail at this point */ | |
1530 | if (!io_grab_identity(req)) | |
1531 | WARN_ON(1); | |
561fb04a | 1532 | } |
cccf0ee8 | 1533 | |
cbdcb435 | 1534 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1535 | { |
cbdcb435 | 1536 | struct io_kiocb *cur; |
54a91f3b | 1537 | |
f2f87370 PB |
1538 | io_for_each_link(cur, req) |
1539 | io_prep_async_work(cur); | |
561fb04a JA |
1540 | } |
1541 | ||
7271ef3a | 1542 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1543 | { |
a197f664 | 1544 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1545 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1546 | |
8766dd51 PB |
1547 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1548 | &req->work, req->flags); | |
1549 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1550 | return link; |
18d9be1a JA |
1551 | } |
1552 | ||
cbdcb435 PB |
1553 | static void io_queue_async_work(struct io_kiocb *req) |
1554 | { | |
7271ef3a JA |
1555 | struct io_kiocb *link; |
1556 | ||
cbdcb435 PB |
1557 | /* init ->work of the whole link before punting */ |
1558 | io_prep_async_link(req); | |
7271ef3a JA |
1559 | link = __io_queue_async_work(req); |
1560 | ||
1561 | if (link) | |
1562 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1563 | } |
1564 | ||
5262f567 JA |
1565 | static void io_kill_timeout(struct io_kiocb *req) |
1566 | { | |
e8c2bc1f | 1567 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1568 | int ret; |
1569 | ||
e8c2bc1f | 1570 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1571 | if (ret != -1) { |
01cec8c1 PB |
1572 | atomic_set(&req->ctx->cq_timeouts, |
1573 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1574 | list_del_init(&req->timeout.list); |
78e19bbe | 1575 | io_cqring_fill_event(req, 0); |
216578e5 | 1576 | io_put_req_deferred(req, 1); |
5262f567 JA |
1577 | } |
1578 | } | |
1579 | ||
76e1b642 JA |
1580 | /* |
1581 | * Returns true if we found and killed one or more timeouts | |
1582 | */ | |
6b81928d PB |
1583 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1584 | struct files_struct *files) | |
5262f567 JA |
1585 | { |
1586 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1587 | int canceled = 0; |
5262f567 JA |
1588 | |
1589 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1590 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1591 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1592 | io_kill_timeout(req); |
76e1b642 JA |
1593 | canceled++; |
1594 | } | |
f3606e3a | 1595 | } |
5262f567 | 1596 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1597 | return canceled != 0; |
5262f567 JA |
1598 | } |
1599 | ||
04518945 | 1600 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1601 | { |
04518945 | 1602 | do { |
27dc8338 PB |
1603 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1604 | struct io_defer_entry, list); | |
7271ef3a | 1605 | struct io_kiocb *link; |
de0617e4 | 1606 | |
9cf7c104 | 1607 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1608 | break; |
27dc8338 | 1609 | list_del_init(&de->list); |
cbdcb435 | 1610 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1611 | link = __io_queue_async_work(de->req); |
1612 | if (link) { | |
1613 | __io_queue_linked_timeout(link); | |
1614 | /* drop submission reference */ | |
216578e5 | 1615 | io_put_req_deferred(link, 1); |
7271ef3a | 1616 | } |
27dc8338 | 1617 | kfree(de); |
04518945 PB |
1618 | } while (!list_empty(&ctx->defer_list)); |
1619 | } | |
1620 | ||
360428f8 | 1621 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1622 | { |
360428f8 PB |
1623 | while (!list_empty(&ctx->timeout_list)) { |
1624 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1625 | struct io_kiocb, timeout.list); |
de0617e4 | 1626 | |
8eb7e2d0 | 1627 | if (io_is_timeout_noseq(req)) |
360428f8 | 1628 | break; |
bfe68a22 PB |
1629 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1630 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1631 | break; |
bfe68a22 | 1632 | |
135fcde8 | 1633 | list_del_init(&req->timeout.list); |
5262f567 | 1634 | io_kill_timeout(req); |
360428f8 PB |
1635 | } |
1636 | } | |
5262f567 | 1637 | |
360428f8 PB |
1638 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1639 | { | |
1640 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1641 | __io_commit_cqring(ctx); |
1642 | ||
04518945 PB |
1643 | if (unlikely(!list_empty(&ctx->defer_list))) |
1644 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1645 | } |
1646 | ||
90554200 JA |
1647 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1648 | { | |
1649 | struct io_rings *r = ctx->rings; | |
1650 | ||
1651 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1652 | } | |
1653 | ||
2b188cc1 JA |
1654 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1655 | { | |
75b28aff | 1656 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1657 | unsigned tail; |
1658 | ||
1659 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1660 | /* |
1661 | * writes to the cq entry need to come after reading head; the | |
1662 | * control dependency is enough as we're using WRITE_ONCE to | |
1663 | * fill the cq entry | |
1664 | */ | |
75b28aff | 1665 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1666 | return NULL; |
1667 | ||
1668 | ctx->cached_cq_tail++; | |
75b28aff | 1669 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1670 | } |
1671 | ||
f2842ab5 JA |
1672 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1673 | { | |
f0b493e6 JA |
1674 | if (!ctx->cq_ev_fd) |
1675 | return false; | |
7e55a19c SG |
1676 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1677 | return false; | |
f2842ab5 JA |
1678 | if (!ctx->eventfd_async) |
1679 | return true; | |
b41e9852 | 1680 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1681 | } |
1682 | ||
b41e9852 | 1683 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1684 | { |
1685 | if (waitqueue_active(&ctx->wait)) | |
1686 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1687 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1688 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1689 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1690 | eventfd_signal(ctx->cq_ev_fd, 1); |
1691 | } | |
1692 | ||
46930143 PB |
1693 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1694 | { | |
1695 | if (list_empty(&ctx->cq_overflow_list)) { | |
1696 | clear_bit(0, &ctx->sq_check_overflow); | |
1697 | clear_bit(0, &ctx->cq_check_overflow); | |
1698 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1699 | } | |
1700 | } | |
1701 | ||
c4a2ed72 | 1702 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1703 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1704 | struct task_struct *tsk, | |
1705 | struct files_struct *files) | |
1d7bb1d5 JA |
1706 | { |
1707 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1708 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1709 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1710 | unsigned long flags; |
1711 | LIST_HEAD(list); | |
1712 | ||
1713 | if (!force) { | |
1714 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1715 | return true; |
1d7bb1d5 JA |
1716 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1717 | rings->cq_ring_entries)) | |
c4a2ed72 | 1718 | return false; |
1d7bb1d5 JA |
1719 | } |
1720 | ||
1721 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1722 | ||
1723 | /* if force is set, the ring is going away. always drop after that */ | |
1724 | if (force) | |
69b3e546 | 1725 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1726 | |
c4a2ed72 | 1727 | cqe = NULL; |
e6c8aa9a | 1728 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1729 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1730 | continue; |
1731 | ||
1d7bb1d5 JA |
1732 | cqe = io_get_cqring(ctx); |
1733 | if (!cqe && !force) | |
1734 | break; | |
1735 | ||
40d8ddd4 | 1736 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1737 | if (cqe) { |
1738 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1739 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1740 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1741 | } else { |
2c3bac6d | 1742 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1743 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1744 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1745 | } |
1746 | } | |
1747 | ||
1748 | io_commit_cqring(ctx); | |
46930143 PB |
1749 | io_cqring_mark_overflow(ctx); |
1750 | ||
1d7bb1d5 JA |
1751 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1752 | io_cqring_ev_posted(ctx); | |
1753 | ||
1754 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1755 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1756 | list_del(&req->compl.list); | |
ec9c02ad | 1757 | io_put_req(req); |
1d7bb1d5 | 1758 | } |
c4a2ed72 JA |
1759 | |
1760 | return cqe != NULL; | |
1d7bb1d5 JA |
1761 | } |
1762 | ||
bcda7baa | 1763 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1764 | { |
78e19bbe | 1765 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1766 | struct io_uring_cqe *cqe; |
1767 | ||
78e19bbe | 1768 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1769 | |
2b188cc1 JA |
1770 | /* |
1771 | * If we can't get a cq entry, userspace overflowed the | |
1772 | * submission (by quite a lot). Increment the overflow count in | |
1773 | * the ring. | |
1774 | */ | |
1775 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1776 | if (likely(cqe)) { |
78e19bbe | 1777 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1778 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1779 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1780 | } else if (ctx->cq_overflow_flushed || |
1781 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1782 | /* |
1783 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1784 | * then we cannot store the request for later flushing, we need | |
1785 | * to drop it on the floor. | |
1786 | */ | |
2c3bac6d PB |
1787 | ctx->cached_cq_overflow++; |
1788 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1789 | } else { |
ad3eb2c8 JA |
1790 | if (list_empty(&ctx->cq_overflow_list)) { |
1791 | set_bit(0, &ctx->sq_check_overflow); | |
1792 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1793 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1794 | } |
40d8ddd4 | 1795 | io_clean_op(req); |
1d7bb1d5 | 1796 | req->result = res; |
0f7e466b | 1797 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1798 | refcount_inc(&req->refs); |
1799 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1800 | } |
1801 | } | |
1802 | ||
bcda7baa JA |
1803 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1804 | { | |
1805 | __io_cqring_fill_event(req, res, 0); | |
1806 | } | |
1807 | ||
e1e16097 | 1808 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1809 | { |
78e19bbe | 1810 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1811 | unsigned long flags; |
1812 | ||
1813 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1814 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1815 | io_commit_cqring(ctx); |
1816 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1817 | ||
8c838788 | 1818 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1819 | } |
1820 | ||
229a7b63 | 1821 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1822 | { |
229a7b63 JA |
1823 | struct io_ring_ctx *ctx = cs->ctx; |
1824 | ||
1825 | spin_lock_irq(&ctx->completion_lock); | |
1826 | while (!list_empty(&cs->list)) { | |
1827 | struct io_kiocb *req; | |
1828 | ||
3ca405eb PB |
1829 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1830 | list_del(&req->compl.list); | |
0f7e466b | 1831 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1832 | |
1833 | /* | |
1834 | * io_free_req() doesn't care about completion_lock unless one | |
1835 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1836 | * because of a potential deadlock with req->work.fs->lock | |
1837 | */ | |
1838 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1839 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1840 | spin_unlock_irq(&ctx->completion_lock); |
1841 | io_put_req(req); | |
1842 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1843 | } else { |
1844 | io_put_req(req); | |
229a7b63 JA |
1845 | } |
1846 | } | |
1847 | io_commit_cqring(ctx); | |
1848 | spin_unlock_irq(&ctx->completion_lock); | |
1849 | ||
1850 | io_cqring_ev_posted(ctx); | |
1851 | cs->nr = 0; | |
1852 | } | |
1853 | ||
1854 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1855 | struct io_comp_state *cs) | |
1856 | { | |
1857 | if (!cs) { | |
1858 | io_cqring_add_event(req, res, cflags); | |
1859 | io_put_req(req); | |
1860 | } else { | |
3ca405eb | 1861 | io_clean_op(req); |
229a7b63 | 1862 | req->result = res; |
0f7e466b | 1863 | req->compl.cflags = cflags; |
3ca405eb | 1864 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1865 | if (++cs->nr >= 32) |
1866 | io_submit_flush_completions(cs); | |
1867 | } | |
e1e16097 JA |
1868 | } |
1869 | ||
1870 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1871 | { |
229a7b63 | 1872 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1873 | } |
1874 | ||
0ddf92e8 JA |
1875 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1876 | { | |
1877 | return req == (struct io_kiocb *) | |
1878 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1879 | } | |
1880 | ||
1881 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1882 | { | |
1883 | struct io_kiocb *req; | |
1884 | ||
1885 | req = ctx->fallback_req; | |
dd461af6 | 1886 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1887 | return req; |
1888 | ||
1889 | return NULL; | |
1890 | } | |
1891 | ||
0553b8bd PB |
1892 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1893 | struct io_submit_state *state) | |
2b188cc1 | 1894 | { |
f6b6c7d6 | 1895 | if (!state->free_reqs) { |
291b2821 | 1896 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1897 | size_t sz; |
1898 | int ret; | |
1899 | ||
1900 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1901 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1902 | ||
1903 | /* | |
1904 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1905 | * retry single alloc to be on the safe side. | |
1906 | */ | |
1907 | if (unlikely(ret <= 0)) { | |
1908 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1909 | if (!state->reqs[0]) | |
0ddf92e8 | 1910 | goto fallback; |
fd6fab2c JA |
1911 | ret = 1; |
1912 | } | |
291b2821 | 1913 | state->free_reqs = ret; |
2b188cc1 JA |
1914 | } |
1915 | ||
291b2821 PB |
1916 | state->free_reqs--; |
1917 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1918 | fallback: |
0553b8bd | 1919 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1920 | } |
1921 | ||
8da11c19 PB |
1922 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1923 | bool fixed) | |
1924 | { | |
1925 | if (fixed) | |
05589553 | 1926 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1927 | else |
1928 | fput(file); | |
1929 | } | |
1930 | ||
4edf20f9 | 1931 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1932 | { |
3ca405eb | 1933 | io_clean_op(req); |
929a3af9 | 1934 | |
e8c2bc1f JA |
1935 | if (req->async_data) |
1936 | kfree(req->async_data); | |
8da11c19 PB |
1937 | if (req->file) |
1938 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1939 | |
4edf20f9 | 1940 | io_req_clean_work(req); |
e65ef56d JA |
1941 | } |
1942 | ||
216578e5 | 1943 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1944 | { |
0f212204 | 1945 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1946 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1947 | |
216578e5 | 1948 | io_dismantle_req(req); |
c6ca97b3 | 1949 | |
d8a6df10 | 1950 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 1951 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 1952 | wake_up(&tctx->wait); |
e3bc8e9d JA |
1953 | put_task_struct(req->task); |
1954 | ||
b1e50e54 PB |
1955 | if (likely(!io_is_fallback_req(req))) |
1956 | kmem_cache_free(req_cachep, req); | |
1957 | else | |
ecfc5177 PB |
1958 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1959 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1960 | } |
1961 | ||
f2f87370 PB |
1962 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1963 | { | |
1964 | struct io_kiocb *nxt = req->link; | |
1965 | ||
1966 | req->link = nxt->link; | |
1967 | nxt->link = NULL; | |
1968 | } | |
1969 | ||
c9abd7ad | 1970 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 1971 | { |
a197f664 | 1972 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 1973 | struct io_kiocb *link; |
c9abd7ad PB |
1974 | bool cancelled = false; |
1975 | unsigned long flags; | |
7c86ffee | 1976 | |
c9abd7ad | 1977 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
1978 | link = req->link; |
1979 | ||
900fad45 PB |
1980 | /* |
1981 | * Can happen if a linked timeout fired and link had been like | |
1982 | * req -> link t-out -> link t-out [-> ...] | |
1983 | */ | |
c9abd7ad PB |
1984 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1985 | struct io_timeout_data *io = link->async_data; | |
1986 | int ret; | |
7c86ffee | 1987 | |
f2f87370 | 1988 | io_remove_next_linked(req); |
90cd7e42 | 1989 | link->timeout.head = NULL; |
c9abd7ad PB |
1990 | ret = hrtimer_try_to_cancel(&io->timer); |
1991 | if (ret != -1) { | |
1992 | io_cqring_fill_event(link, -ECANCELED); | |
1993 | io_commit_cqring(ctx); | |
1994 | cancelled = true; | |
1995 | } | |
1996 | } | |
7c86ffee | 1997 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 1998 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 1999 | |
c9abd7ad | 2000 | if (cancelled) { |
7c86ffee | 2001 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2002 | io_put_req(link); |
2003 | } | |
7c86ffee PB |
2004 | } |
2005 | ||
9e645e11 | 2006 | |
d148ca4b | 2007 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2008 | { |
f2f87370 | 2009 | struct io_kiocb *link, *nxt; |
2665abfd | 2010 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2011 | unsigned long flags; |
9e645e11 | 2012 | |
d148ca4b | 2013 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2014 | link = req->link; |
2015 | req->link = NULL; | |
9e645e11 | 2016 | |
f2f87370 PB |
2017 | while (link) { |
2018 | nxt = link->link; | |
2019 | link->link = NULL; | |
2665abfd | 2020 | |
f2f87370 | 2021 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2022 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2023 | |
2024 | /* | |
2025 | * It's ok to free under spinlock as they're not linked anymore, | |
2026 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2027 | * work.fs->lock. | |
2028 | */ | |
2029 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2030 | io_put_req_deferred(link, 2); | |
2031 | else | |
2032 | io_double_put_req(link); | |
f2f87370 | 2033 | link = nxt; |
9e645e11 | 2034 | } |
2665abfd | 2035 | io_commit_cqring(ctx); |
216578e5 | 2036 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2037 | |
2665abfd | 2038 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2039 | } |
2040 | ||
3fa5e0f3 | 2041 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2042 | { |
7c86ffee PB |
2043 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2044 | io_kill_linked_timeout(req); | |
944e58bf | 2045 | |
9e645e11 JA |
2046 | /* |
2047 | * If LINK is set, we have dependent requests in this chain. If we | |
2048 | * didn't fail this request, queue the first one up, moving any other | |
2049 | * dependencies to the next request. In case of failure, fail the rest | |
2050 | * of the chain. | |
2051 | */ | |
f2f87370 PB |
2052 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2053 | struct io_kiocb *nxt = req->link; | |
2054 | ||
2055 | req->link = NULL; | |
2056 | return nxt; | |
2057 | } | |
9b5f7bd9 PB |
2058 | io_fail_links(req); |
2059 | return NULL; | |
4d7dd462 | 2060 | } |
9e645e11 | 2061 | |
f2f87370 | 2062 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2063 | { |
f2f87370 | 2064 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2065 | return NULL; |
2066 | return __io_req_find_next(req); | |
2067 | } | |
2068 | ||
87c4311f | 2069 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
2070 | { |
2071 | struct task_struct *tsk = req->task; | |
2072 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2073 | enum task_work_notify_mode notify; |
2074 | int ret; | |
c2c4c83c | 2075 | |
6200b0ae JA |
2076 | if (tsk->flags & PF_EXITING) |
2077 | return -ESRCH; | |
2078 | ||
c2c4c83c | 2079 | /* |
0ba9c9ed JA |
2080 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2081 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2082 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2083 | * will do the job. | |
c2c4c83c | 2084 | */ |
91989c70 | 2085 | notify = TWA_NONE; |
fd7d6de2 | 2086 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
2087 | notify = TWA_SIGNAL; |
2088 | ||
87c4311f | 2089 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2090 | if (!ret) |
2091 | wake_up_process(tsk); | |
0ba9c9ed | 2092 | |
c2c4c83c JA |
2093 | return ret; |
2094 | } | |
2095 | ||
c40f6379 JA |
2096 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2097 | { | |
2098 | struct io_ring_ctx *ctx = req->ctx; | |
2099 | ||
2100 | spin_lock_irq(&ctx->completion_lock); | |
2101 | io_cqring_fill_event(req, error); | |
2102 | io_commit_cqring(ctx); | |
2103 | spin_unlock_irq(&ctx->completion_lock); | |
2104 | ||
2105 | io_cqring_ev_posted(ctx); | |
2106 | req_set_fail_links(req); | |
2107 | io_double_put_req(req); | |
2108 | } | |
2109 | ||
2110 | static void io_req_task_cancel(struct callback_head *cb) | |
2111 | { | |
2112 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2113 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2114 | |
2115 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2116 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2117 | } |
2118 | ||
2119 | static void __io_req_task_submit(struct io_kiocb *req) | |
2120 | { | |
2121 | struct io_ring_ctx *ctx = req->ctx; | |
2122 | ||
1a38ffc9 PB |
2123 | if (!__io_sq_thread_acquire_mm(ctx) && |
2124 | !__io_sq_thread_acquire_files(ctx)) { | |
c40f6379 | 2125 | mutex_lock(&ctx->uring_lock); |
c1379e24 | 2126 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2127 | mutex_unlock(&ctx->uring_lock); |
2128 | } else { | |
2129 | __io_req_task_cancel(req, -EFAULT); | |
2130 | } | |
2131 | } | |
2132 | ||
2133 | static void io_req_task_submit(struct callback_head *cb) | |
2134 | { | |
2135 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2136 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2137 | |
2138 | __io_req_task_submit(req); | |
6d816e08 | 2139 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2140 | } |
2141 | ||
2142 | static void io_req_task_queue(struct io_kiocb *req) | |
2143 | { | |
c40f6379 JA |
2144 | int ret; |
2145 | ||
2146 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2147 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2148 | |
87c4311f | 2149 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2150 | if (unlikely(ret)) { |
c2c4c83c JA |
2151 | struct task_struct *tsk; |
2152 | ||
c40f6379 JA |
2153 | init_task_work(&req->task_work, io_req_task_cancel); |
2154 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2155 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2156 | wake_up_process(tsk); |
c40f6379 | 2157 | } |
c40f6379 JA |
2158 | } |
2159 | ||
f2f87370 | 2160 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2161 | { |
9b5f7bd9 | 2162 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2163 | |
2164 | if (nxt) | |
906a8c3f | 2165 | io_req_task_queue(nxt); |
c69f8dbe JL |
2166 | } |
2167 | ||
c3524383 | 2168 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2169 | { |
c3524383 PB |
2170 | io_queue_next(req); |
2171 | __io_free_req(req); | |
2172 | } | |
8766dd51 | 2173 | |
2d6500d4 PB |
2174 | struct req_batch { |
2175 | void *reqs[IO_IOPOLL_BATCH]; | |
2176 | int to_free; | |
7a743e22 | 2177 | |
5af1d13e PB |
2178 | struct task_struct *task; |
2179 | int task_refs; | |
2d6500d4 PB |
2180 | }; |
2181 | ||
5af1d13e PB |
2182 | static inline void io_init_req_batch(struct req_batch *rb) |
2183 | { | |
2184 | rb->to_free = 0; | |
2185 | rb->task_refs = 0; | |
2186 | rb->task = NULL; | |
2187 | } | |
2188 | ||
2d6500d4 PB |
2189 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2190 | struct req_batch *rb) | |
2191 | { | |
2192 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2193 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2194 | rb->to_free = 0; | |
2195 | } | |
2196 | ||
2197 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2198 | struct req_batch *rb) | |
2199 | { | |
2200 | if (rb->to_free) | |
2201 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2202 | if (rb->task) { |
d8a6df10 JA |
2203 | struct io_uring_task *tctx = rb->task->io_uring; |
2204 | ||
2205 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2206 | put_task_struct_many(rb->task, rb->task_refs); |
2207 | rb->task = NULL; | |
2208 | } | |
2d6500d4 PB |
2209 | } |
2210 | ||
2211 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2212 | { | |
2213 | if (unlikely(io_is_fallback_req(req))) { | |
2214 | io_free_req(req); | |
2215 | return; | |
2216 | } | |
f2f87370 | 2217 | io_queue_next(req); |
2d6500d4 | 2218 | |
e3bc8e9d | 2219 | if (req->task != rb->task) { |
0f212204 | 2220 | if (rb->task) { |
d8a6df10 JA |
2221 | struct io_uring_task *tctx = rb->task->io_uring; |
2222 | ||
2223 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2224 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2225 | } |
e3bc8e9d JA |
2226 | rb->task = req->task; |
2227 | rb->task_refs = 0; | |
5af1d13e | 2228 | } |
e3bc8e9d | 2229 | rb->task_refs++; |
5af1d13e | 2230 | |
4edf20f9 | 2231 | io_dismantle_req(req); |
2d6500d4 PB |
2232 | rb->reqs[rb->to_free++] = req; |
2233 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2234 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2235 | } |
2236 | ||
ba816ad6 JA |
2237 | /* |
2238 | * Drop reference to request, return next in chain (if there is one) if this | |
2239 | * was the last reference to this request. | |
2240 | */ | |
9b5f7bd9 | 2241 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2242 | { |
9b5f7bd9 PB |
2243 | struct io_kiocb *nxt = NULL; |
2244 | ||
2a44f467 | 2245 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2246 | nxt = io_req_find_next(req); |
4d7dd462 | 2247 | __io_free_req(req); |
2a44f467 | 2248 | } |
9b5f7bd9 | 2249 | return nxt; |
2b188cc1 JA |
2250 | } |
2251 | ||
e65ef56d JA |
2252 | static void io_put_req(struct io_kiocb *req) |
2253 | { | |
2254 | if (refcount_dec_and_test(&req->refs)) | |
2255 | io_free_req(req); | |
2b188cc1 JA |
2256 | } |
2257 | ||
216578e5 PB |
2258 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2259 | { | |
2260 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2261 | ||
2262 | io_free_req(req); | |
2263 | } | |
2264 | ||
2265 | static void io_free_req_deferred(struct io_kiocb *req) | |
2266 | { | |
2267 | int ret; | |
2268 | ||
2269 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2270 | ret = io_req_task_work_add(req, true); | |
2271 | if (unlikely(ret)) { | |
2272 | struct task_struct *tsk; | |
2273 | ||
2274 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2275 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2276 | wake_up_process(tsk); |
2277 | } | |
2278 | } | |
2279 | ||
2280 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2281 | { | |
2282 | if (refcount_sub_and_test(refs, &req->refs)) | |
2283 | io_free_req_deferred(req); | |
2284 | } | |
2285 | ||
f4db7182 | 2286 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2287 | { |
6df1db6b | 2288 | struct io_kiocb *nxt; |
f4db7182 | 2289 | |
7a743e22 | 2290 | /* |
f4db7182 PB |
2291 | * A ref is owned by io-wq in which context we're. So, if that's the |
2292 | * last one, it's safe to steal next work. False negatives are Ok, | |
2293 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2294 | */ |
f4db7182 PB |
2295 | if (refcount_read(&req->refs) != 1) |
2296 | return NULL; | |
7a743e22 | 2297 | |
9b5f7bd9 | 2298 | nxt = io_req_find_next(req); |
6df1db6b | 2299 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2300 | } |
2301 | ||
978db57e JA |
2302 | static void io_double_put_req(struct io_kiocb *req) |
2303 | { | |
2304 | /* drop both submit and complete references */ | |
2305 | if (refcount_sub_and_test(2, &req->refs)) | |
2306 | io_free_req(req); | |
2307 | } | |
2308 | ||
1d7bb1d5 | 2309 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2310 | { |
84f97dc2 JA |
2311 | struct io_rings *rings = ctx->rings; |
2312 | ||
ad3eb2c8 JA |
2313 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2314 | /* | |
2315 | * noflush == true is from the waitqueue handler, just ensure | |
2316 | * we wake up the task, and the next invocation will flush the | |
2317 | * entries. We cannot safely to it from here. | |
2318 | */ | |
2319 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2320 | return -1U; | |
1d7bb1d5 | 2321 | |
e6c8aa9a | 2322 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2323 | } |
1d7bb1d5 | 2324 | |
a3a0e43f JA |
2325 | /* See comment at the top of this file */ |
2326 | smp_rmb(); | |
ad3eb2c8 | 2327 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2328 | } |
2329 | ||
fb5ccc98 PB |
2330 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2331 | { | |
2332 | struct io_rings *rings = ctx->rings; | |
2333 | ||
2334 | /* make sure SQ entry isn't read before tail */ | |
2335 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2336 | } | |
2337 | ||
8ff069bf | 2338 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2339 | { |
8ff069bf | 2340 | unsigned int cflags; |
e94f141b | 2341 | |
bcda7baa JA |
2342 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2343 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2344 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2345 | kfree(kbuf); |
2346 | return cflags; | |
e94f141b JA |
2347 | } |
2348 | ||
8ff069bf | 2349 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2350 | { |
4d954c25 | 2351 | struct io_buffer *kbuf; |
bcda7baa | 2352 | |
4d954c25 | 2353 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2354 | return io_put_kbuf(req, kbuf); |
2355 | } | |
2356 | ||
4c6e277c JA |
2357 | static inline bool io_run_task_work(void) |
2358 | { | |
6200b0ae JA |
2359 | /* |
2360 | * Not safe to run on exiting task, and the task_work handling will | |
2361 | * not add work to such a task. | |
2362 | */ | |
2363 | if (unlikely(current->flags & PF_EXITING)) | |
2364 | return false; | |
4c6e277c JA |
2365 | if (current->task_works) { |
2366 | __set_current_state(TASK_RUNNING); | |
2367 | task_work_run(); | |
2368 | return true; | |
2369 | } | |
2370 | ||
2371 | return false; | |
bcda7baa JA |
2372 | } |
2373 | ||
bbde017a XW |
2374 | static void io_iopoll_queue(struct list_head *again) |
2375 | { | |
2376 | struct io_kiocb *req; | |
2377 | ||
2378 | do { | |
d21ffe7e PB |
2379 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2380 | list_del(&req->inflight_entry); | |
81b68a5c | 2381 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2382 | } while (!list_empty(again)); |
2383 | } | |
2384 | ||
def596e9 JA |
2385 | /* |
2386 | * Find and free completed poll iocbs | |
2387 | */ | |
2388 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2389 | struct list_head *done) | |
2390 | { | |
8237e045 | 2391 | struct req_batch rb; |
def596e9 | 2392 | struct io_kiocb *req; |
bbde017a XW |
2393 | LIST_HEAD(again); |
2394 | ||
2395 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2396 | smp_rmb(); | |
def596e9 | 2397 | |
5af1d13e | 2398 | io_init_req_batch(&rb); |
def596e9 | 2399 | while (!list_empty(done)) { |
bcda7baa JA |
2400 | int cflags = 0; |
2401 | ||
d21ffe7e | 2402 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2403 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2404 | req->result = 0; |
bbde017a | 2405 | req->iopoll_completed = 0; |
d21ffe7e | 2406 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2407 | continue; |
2408 | } | |
d21ffe7e | 2409 | list_del(&req->inflight_entry); |
def596e9 | 2410 | |
bcda7baa | 2411 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2412 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2413 | |
2414 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2415 | (*nr_events)++; |
2416 | ||
c3524383 | 2417 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2418 | io_req_free_batch(&rb, req); |
def596e9 | 2419 | } |
def596e9 | 2420 | |
09bb8394 | 2421 | io_commit_cqring(ctx); |
32b2244a XW |
2422 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2423 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2424 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2425 | |
bbde017a XW |
2426 | if (!list_empty(&again)) |
2427 | io_iopoll_queue(&again); | |
581f9810 BM |
2428 | } |
2429 | ||
def596e9 JA |
2430 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2431 | long min) | |
2432 | { | |
2433 | struct io_kiocb *req, *tmp; | |
2434 | LIST_HEAD(done); | |
2435 | bool spin; | |
2436 | int ret; | |
2437 | ||
2438 | /* | |
2439 | * Only spin for completions if we don't have multiple devices hanging | |
2440 | * off our complete list, and we're under the requested amount. | |
2441 | */ | |
2442 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2443 | ||
2444 | ret = 0; | |
d21ffe7e | 2445 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2446 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2447 | |
2448 | /* | |
581f9810 BM |
2449 | * Move completed and retryable entries to our local lists. |
2450 | * If we find a request that requires polling, break out | |
2451 | * and complete those lists first, if we have entries there. | |
def596e9 | 2452 | */ |
65a6543d | 2453 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2454 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2455 | continue; |
2456 | } | |
2457 | if (!list_empty(&done)) | |
2458 | break; | |
2459 | ||
2460 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2461 | if (ret < 0) | |
2462 | break; | |
2463 | ||
3aadc23e PB |
2464 | /* iopoll may have completed current req */ |
2465 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2466 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2467 | |
def596e9 JA |
2468 | if (ret && spin) |
2469 | spin = false; | |
2470 | ret = 0; | |
2471 | } | |
2472 | ||
2473 | if (!list_empty(&done)) | |
2474 | io_iopoll_complete(ctx, nr_events, &done); | |
2475 | ||
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | /* | |
d195a66e | 2480 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2481 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2482 | * as a non-spinning completion check. | |
2483 | */ | |
2484 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2485 | long min) | |
2486 | { | |
540e32a0 | 2487 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2488 | int ret; |
2489 | ||
2490 | ret = io_do_iopoll(ctx, nr_events, min); | |
2491 | if (ret < 0) | |
2492 | return ret; | |
eba0a4dd | 2493 | if (*nr_events >= min) |
def596e9 JA |
2494 | return 0; |
2495 | } | |
2496 | ||
2497 | return 1; | |
2498 | } | |
2499 | ||
2500 | /* | |
2501 | * We can't just wait for polled events to come to us, we have to actively | |
2502 | * find and complete them. | |
2503 | */ | |
b2edc0a7 | 2504 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2505 | { |
2506 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2507 | return; | |
2508 | ||
2509 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2510 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2511 | unsigned int nr_events = 0; |
2512 | ||
b2edc0a7 | 2513 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2514 | |
b2edc0a7 PB |
2515 | /* let it sleep and repeat later if can't complete a request */ |
2516 | if (nr_events == 0) | |
2517 | break; | |
08f5439f JA |
2518 | /* |
2519 | * Ensure we allow local-to-the-cpu processing to take place, | |
2520 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2521 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2522 | */ |
3fcee5a6 PB |
2523 | if (need_resched()) { |
2524 | mutex_unlock(&ctx->uring_lock); | |
2525 | cond_resched(); | |
2526 | mutex_lock(&ctx->uring_lock); | |
2527 | } | |
def596e9 JA |
2528 | } |
2529 | mutex_unlock(&ctx->uring_lock); | |
2530 | } | |
2531 | ||
7668b92a | 2532 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2533 | { |
7668b92a | 2534 | unsigned int nr_events = 0; |
2b2ed975 | 2535 | int iters = 0, ret = 0; |
500f9fba | 2536 | |
c7849be9 XW |
2537 | /* |
2538 | * We disallow the app entering submit/complete with polling, but we | |
2539 | * still need to lock the ring to prevent racing with polled issue | |
2540 | * that got punted to a workqueue. | |
2541 | */ | |
2542 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2543 | do { |
a3a0e43f JA |
2544 | /* |
2545 | * Don't enter poll loop if we already have events pending. | |
2546 | * If we do, we can potentially be spinning for commands that | |
2547 | * already triggered a CQE (eg in error). | |
2548 | */ | |
1d7bb1d5 | 2549 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2550 | break; |
2551 | ||
500f9fba JA |
2552 | /* |
2553 | * If a submit got punted to a workqueue, we can have the | |
2554 | * application entering polling for a command before it gets | |
2555 | * issued. That app will hold the uring_lock for the duration | |
2556 | * of the poll right here, so we need to take a breather every | |
2557 | * now and then to ensure that the issue has a chance to add | |
2558 | * the poll to the issued list. Otherwise we can spin here | |
2559 | * forever, while the workqueue is stuck trying to acquire the | |
2560 | * very same mutex. | |
2561 | */ | |
2562 | if (!(++iters & 7)) { | |
2563 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2564 | io_run_task_work(); |
500f9fba JA |
2565 | mutex_lock(&ctx->uring_lock); |
2566 | } | |
2567 | ||
7668b92a | 2568 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2569 | if (ret <= 0) |
2570 | break; | |
2571 | ret = 0; | |
7668b92a | 2572 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2573 | |
500f9fba | 2574 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2575 | return ret; |
2576 | } | |
2577 | ||
491381ce | 2578 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2579 | { |
491381ce JA |
2580 | /* |
2581 | * Tell lockdep we inherited freeze protection from submission | |
2582 | * thread. | |
2583 | */ | |
2584 | if (req->flags & REQ_F_ISREG) { | |
2585 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2586 | |
491381ce | 2587 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2588 | } |
491381ce | 2589 | file_end_write(req->file); |
2b188cc1 JA |
2590 | } |
2591 | ||
a1d7c393 JA |
2592 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2593 | struct io_comp_state *cs) | |
2b188cc1 | 2594 | { |
9adbd45d | 2595 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2596 | int cflags = 0; |
2b188cc1 | 2597 | |
491381ce JA |
2598 | if (kiocb->ki_flags & IOCB_WRITE) |
2599 | kiocb_end_write(req); | |
2b188cc1 | 2600 | |
4e88d6e7 JA |
2601 | if (res != req->result) |
2602 | req_set_fail_links(req); | |
bcda7baa | 2603 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2604 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2605 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2606 | } |
2607 | ||
b63534c4 JA |
2608 | #ifdef CONFIG_BLOCK |
2609 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2610 | { | |
2611 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2612 | ssize_t ret = -ECANCELED; | |
2613 | struct iov_iter iter; | |
2614 | int rw; | |
2615 | ||
2616 | if (error) { | |
2617 | ret = error; | |
2618 | goto end_req; | |
2619 | } | |
2620 | ||
2621 | switch (req->opcode) { | |
2622 | case IORING_OP_READV: | |
2623 | case IORING_OP_READ_FIXED: | |
2624 | case IORING_OP_READ: | |
2625 | rw = READ; | |
2626 | break; | |
2627 | case IORING_OP_WRITEV: | |
2628 | case IORING_OP_WRITE_FIXED: | |
2629 | case IORING_OP_WRITE: | |
2630 | rw = WRITE; | |
2631 | break; | |
2632 | default: | |
2633 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2634 | req->opcode); | |
2635 | goto end_req; | |
2636 | } | |
2637 | ||
e8c2bc1f | 2638 | if (!req->async_data) { |
8f3d7496 JA |
2639 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2640 | if (ret < 0) | |
2641 | goto end_req; | |
2642 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2643 | if (!ret) | |
2644 | return true; | |
2645 | kfree(iovec); | |
2646 | } else { | |
b63534c4 | 2647 | return true; |
8f3d7496 | 2648 | } |
b63534c4 | 2649 | end_req: |
b63534c4 | 2650 | req_set_fail_links(req); |
b63534c4 JA |
2651 | return false; |
2652 | } | |
b63534c4 JA |
2653 | #endif |
2654 | ||
2655 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2656 | { | |
2657 | #ifdef CONFIG_BLOCK | |
355afaeb | 2658 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2659 | int ret; |
2660 | ||
355afaeb JA |
2661 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2662 | return false; | |
b63534c4 JA |
2663 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2664 | return false; | |
2665 | ||
28cea78a | 2666 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2667 | |
fdee946d JA |
2668 | if (io_resubmit_prep(req, ret)) { |
2669 | refcount_inc(&req->refs); | |
2670 | io_queue_async_work(req); | |
b63534c4 | 2671 | return true; |
fdee946d JA |
2672 | } |
2673 | ||
b63534c4 JA |
2674 | #endif |
2675 | return false; | |
2676 | } | |
2677 | ||
a1d7c393 JA |
2678 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2679 | struct io_comp_state *cs) | |
2680 | { | |
2681 | if (!io_rw_reissue(req, res)) | |
2682 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2683 | } |
2684 | ||
2685 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2686 | { | |
9adbd45d | 2687 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2688 | |
a1d7c393 | 2689 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2690 | } |
2691 | ||
def596e9 JA |
2692 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2693 | { | |
9adbd45d | 2694 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2695 | |
491381ce JA |
2696 | if (kiocb->ki_flags & IOCB_WRITE) |
2697 | kiocb_end_write(req); | |
def596e9 | 2698 | |
2d7d6792 | 2699 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2700 | req_set_fail_links(req); |
bbde017a XW |
2701 | |
2702 | WRITE_ONCE(req->result, res); | |
2703 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2704 | smp_wmb(); |
2705 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2706 | } |
2707 | ||
2708 | /* | |
2709 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2710 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2711 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2712 | * accessing the kiocb cookie. | |
2713 | */ | |
2714 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2715 | { | |
2716 | struct io_ring_ctx *ctx = req->ctx; | |
2717 | ||
2718 | /* | |
2719 | * Track whether we have multiple files in our lists. This will impact | |
2720 | * how we do polling eventually, not spinning if we're on potentially | |
2721 | * different devices. | |
2722 | */ | |
540e32a0 | 2723 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2724 | ctx->poll_multi_file = false; |
2725 | } else if (!ctx->poll_multi_file) { | |
2726 | struct io_kiocb *list_req; | |
2727 | ||
540e32a0 | 2728 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2729 | inflight_entry); |
9adbd45d | 2730 | if (list_req->file != req->file) |
def596e9 JA |
2731 | ctx->poll_multi_file = true; |
2732 | } | |
2733 | ||
2734 | /* | |
2735 | * For fast devices, IO may have already completed. If it has, add | |
2736 | * it to the front so we find it first. | |
2737 | */ | |
65a6543d | 2738 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2739 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2740 | else |
d21ffe7e | 2741 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2742 | |
2743 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2744 | wq_has_sleeper(&ctx->sq_data->wait)) |
2745 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2746 | } |
2747 | ||
9f13c35b | 2748 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2749 | { |
06ef3608 PB |
2750 | if (state->has_refs) |
2751 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2752 | state->file = NULL; |
2753 | } | |
2754 | ||
2755 | static inline void io_state_file_put(struct io_submit_state *state) | |
2756 | { | |
2757 | if (state->file) | |
2758 | __io_state_file_put(state); | |
9a56a232 JA |
2759 | } |
2760 | ||
2761 | /* | |
2762 | * Get as many references to a file as we have IOs left in this submission, | |
2763 | * assuming most submissions are for one file, or at least that each file | |
2764 | * has more than one submission. | |
2765 | */ | |
8da11c19 | 2766 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2767 | { |
2768 | if (!state) | |
2769 | return fget(fd); | |
2770 | ||
2771 | if (state->file) { | |
2772 | if (state->fd == fd) { | |
06ef3608 | 2773 | state->has_refs--; |
9a56a232 JA |
2774 | return state->file; |
2775 | } | |
9f13c35b | 2776 | __io_state_file_put(state); |
9a56a232 JA |
2777 | } |
2778 | state->file = fget_many(fd, state->ios_left); | |
2779 | if (!state->file) | |
2780 | return NULL; | |
2781 | ||
2782 | state->fd = fd; | |
71b547c0 | 2783 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2784 | return state->file; |
2785 | } | |
2786 | ||
4503b767 JA |
2787 | static bool io_bdev_nowait(struct block_device *bdev) |
2788 | { | |
2789 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2790 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2791 | #else |
2792 | return true; | |
2793 | #endif | |
2794 | } | |
2795 | ||
2b188cc1 JA |
2796 | /* |
2797 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2798 | * any file. For now, just ensure that anything potentially problematic is done | |
2799 | * inline. | |
2800 | */ | |
af197f50 | 2801 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2802 | { |
2803 | umode_t mode = file_inode(file)->i_mode; | |
2804 | ||
4503b767 JA |
2805 | if (S_ISBLK(mode)) { |
2806 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2807 | return true; | |
2808 | return false; | |
2809 | } | |
2810 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2811 | return true; |
4503b767 JA |
2812 | if (S_ISREG(mode)) { |
2813 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2814 | file->f_op != &io_uring_fops) | |
2815 | return true; | |
2816 | return false; | |
2817 | } | |
2b188cc1 | 2818 | |
c5b85625 JA |
2819 | /* any ->read/write should understand O_NONBLOCK */ |
2820 | if (file->f_flags & O_NONBLOCK) | |
2821 | return true; | |
2822 | ||
af197f50 JA |
2823 | if (!(file->f_mode & FMODE_NOWAIT)) |
2824 | return false; | |
2825 | ||
2826 | if (rw == READ) | |
2827 | return file->f_op->read_iter != NULL; | |
2828 | ||
2829 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2830 | } |
2831 | ||
a88fc400 | 2832 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2833 | { |
def596e9 | 2834 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2835 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2836 | unsigned ioprio; |
2837 | int ret; | |
2b188cc1 | 2838 | |
491381ce JA |
2839 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2840 | req->flags |= REQ_F_ISREG; | |
2841 | ||
2b188cc1 | 2842 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2843 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2844 | req->flags |= REQ_F_CUR_POS; | |
2845 | kiocb->ki_pos = req->file->f_pos; | |
2846 | } | |
2b188cc1 | 2847 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2848 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2849 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2850 | if (unlikely(ret)) | |
2851 | return ret; | |
2b188cc1 JA |
2852 | |
2853 | ioprio = READ_ONCE(sqe->ioprio); | |
2854 | if (ioprio) { | |
2855 | ret = ioprio_check_cap(ioprio); | |
2856 | if (ret) | |
09bb8394 | 2857 | return ret; |
2b188cc1 JA |
2858 | |
2859 | kiocb->ki_ioprio = ioprio; | |
2860 | } else | |
2861 | kiocb->ki_ioprio = get_current_ioprio(); | |
2862 | ||
8449eeda | 2863 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2864 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2865 | req->flags |= REQ_F_NOWAIT; |
2866 | ||
def596e9 | 2867 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2868 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2869 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2870 | return -EOPNOTSUPP; |
2b188cc1 | 2871 | |
def596e9 JA |
2872 | kiocb->ki_flags |= IOCB_HIPRI; |
2873 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2874 | req->iopoll_completed = 0; |
def596e9 | 2875 | } else { |
09bb8394 JA |
2876 | if (kiocb->ki_flags & IOCB_HIPRI) |
2877 | return -EINVAL; | |
def596e9 JA |
2878 | kiocb->ki_complete = io_complete_rw; |
2879 | } | |
9adbd45d | 2880 | |
3529d8c2 JA |
2881 | req->rw.addr = READ_ONCE(sqe->addr); |
2882 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2883 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2884 | return 0; |
2b188cc1 JA |
2885 | } |
2886 | ||
2887 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2888 | { | |
2889 | switch (ret) { | |
2890 | case -EIOCBQUEUED: | |
2891 | break; | |
2892 | case -ERESTARTSYS: | |
2893 | case -ERESTARTNOINTR: | |
2894 | case -ERESTARTNOHAND: | |
2895 | case -ERESTART_RESTARTBLOCK: | |
2896 | /* | |
2897 | * We can't just restart the syscall, since previously | |
2898 | * submitted sqes may already be in progress. Just fail this | |
2899 | * IO with EINTR. | |
2900 | */ | |
2901 | ret = -EINTR; | |
df561f66 | 2902 | fallthrough; |
2b188cc1 JA |
2903 | default: |
2904 | kiocb->ki_complete(kiocb, ret, 0); | |
2905 | } | |
2906 | } | |
2907 | ||
a1d7c393 JA |
2908 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2909 | struct io_comp_state *cs) | |
ba816ad6 | 2910 | { |
ba04291e | 2911 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2912 | struct io_async_rw *io = req->async_data; |
ba04291e | 2913 | |
227c0c96 | 2914 | /* add previously done IO, if any */ |
e8c2bc1f | 2915 | if (io && io->bytes_done > 0) { |
227c0c96 | 2916 | if (ret < 0) |
e8c2bc1f | 2917 | ret = io->bytes_done; |
227c0c96 | 2918 | else |
e8c2bc1f | 2919 | ret += io->bytes_done; |
227c0c96 JA |
2920 | } |
2921 | ||
ba04291e JA |
2922 | if (req->flags & REQ_F_CUR_POS) |
2923 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2924 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2925 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2926 | else |
2927 | io_rw_done(kiocb, ret); | |
2928 | } | |
2929 | ||
9adbd45d | 2930 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2931 | struct iov_iter *iter) |
edafccee | 2932 | { |
9adbd45d JA |
2933 | struct io_ring_ctx *ctx = req->ctx; |
2934 | size_t len = req->rw.len; | |
edafccee | 2935 | struct io_mapped_ubuf *imu; |
4be1c615 | 2936 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2937 | size_t offset; |
2938 | u64 buf_addr; | |
2939 | ||
edafccee JA |
2940 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2941 | return -EFAULT; | |
edafccee JA |
2942 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2943 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2944 | buf_addr = req->rw.addr; |
edafccee JA |
2945 | |
2946 | /* overflow */ | |
2947 | if (buf_addr + len < buf_addr) | |
2948 | return -EFAULT; | |
2949 | /* not inside the mapped region */ | |
2950 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2951 | return -EFAULT; | |
2952 | ||
2953 | /* | |
2954 | * May not be a start of buffer, set size appropriately | |
2955 | * and advance us to the beginning. | |
2956 | */ | |
2957 | offset = buf_addr - imu->ubuf; | |
2958 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2959 | |
2960 | if (offset) { | |
2961 | /* | |
2962 | * Don't use iov_iter_advance() here, as it's really slow for | |
2963 | * using the latter parts of a big fixed buffer - it iterates | |
2964 | * over each segment manually. We can cheat a bit here, because | |
2965 | * we know that: | |
2966 | * | |
2967 | * 1) it's a BVEC iter, we set it up | |
2968 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2969 | * first and last bvec | |
2970 | * | |
2971 | * So just find our index, and adjust the iterator afterwards. | |
2972 | * If the offset is within the first bvec (or the whole first | |
2973 | * bvec, just use iov_iter_advance(). This makes it easier | |
2974 | * since we can just skip the first segment, which may not | |
2975 | * be PAGE_SIZE aligned. | |
2976 | */ | |
2977 | const struct bio_vec *bvec = imu->bvec; | |
2978 | ||
2979 | if (offset <= bvec->bv_len) { | |
2980 | iov_iter_advance(iter, offset); | |
2981 | } else { | |
2982 | unsigned long seg_skip; | |
2983 | ||
2984 | /* skip first vec */ | |
2985 | offset -= bvec->bv_len; | |
2986 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2987 | ||
2988 | iter->bvec = bvec + seg_skip; | |
2989 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2990 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2991 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2992 | } |
2993 | } | |
2994 | ||
5e559561 | 2995 | return len; |
edafccee JA |
2996 | } |
2997 | ||
bcda7baa JA |
2998 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2999 | { | |
3000 | if (needs_lock) | |
3001 | mutex_unlock(&ctx->uring_lock); | |
3002 | } | |
3003 | ||
3004 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3005 | { | |
3006 | /* | |
3007 | * "Normal" inline submissions always hold the uring_lock, since we | |
3008 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3009 | * The only exception is when we've detached the request and issue it | |
3010 | * from an async worker thread, grab the lock for that case. | |
3011 | */ | |
3012 | if (needs_lock) | |
3013 | mutex_lock(&ctx->uring_lock); | |
3014 | } | |
3015 | ||
3016 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3017 | int bgid, struct io_buffer *kbuf, | |
3018 | bool needs_lock) | |
3019 | { | |
3020 | struct io_buffer *head; | |
3021 | ||
3022 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3023 | return kbuf; | |
3024 | ||
3025 | io_ring_submit_lock(req->ctx, needs_lock); | |
3026 | ||
3027 | lockdep_assert_held(&req->ctx->uring_lock); | |
3028 | ||
3029 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3030 | if (head) { | |
3031 | if (!list_empty(&head->list)) { | |
3032 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3033 | list); | |
3034 | list_del(&kbuf->list); | |
3035 | } else { | |
3036 | kbuf = head; | |
3037 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3038 | } | |
3039 | if (*len > kbuf->len) | |
3040 | *len = kbuf->len; | |
3041 | } else { | |
3042 | kbuf = ERR_PTR(-ENOBUFS); | |
3043 | } | |
3044 | ||
3045 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3046 | ||
3047 | return kbuf; | |
3048 | } | |
3049 | ||
4d954c25 JA |
3050 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3051 | bool needs_lock) | |
3052 | { | |
3053 | struct io_buffer *kbuf; | |
4f4eeba8 | 3054 | u16 bgid; |
4d954c25 JA |
3055 | |
3056 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3057 | bgid = req->buf_index; |
4d954c25 JA |
3058 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3059 | if (IS_ERR(kbuf)) | |
3060 | return kbuf; | |
3061 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3062 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3063 | return u64_to_user_ptr(kbuf->addr); | |
3064 | } | |
3065 | ||
3066 | #ifdef CONFIG_COMPAT | |
3067 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3068 | bool needs_lock) | |
3069 | { | |
3070 | struct compat_iovec __user *uiov; | |
3071 | compat_ssize_t clen; | |
3072 | void __user *buf; | |
3073 | ssize_t len; | |
3074 | ||
3075 | uiov = u64_to_user_ptr(req->rw.addr); | |
3076 | if (!access_ok(uiov, sizeof(*uiov))) | |
3077 | return -EFAULT; | |
3078 | if (__get_user(clen, &uiov->iov_len)) | |
3079 | return -EFAULT; | |
3080 | if (clen < 0) | |
3081 | return -EINVAL; | |
3082 | ||
3083 | len = clen; | |
3084 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3085 | if (IS_ERR(buf)) | |
3086 | return PTR_ERR(buf); | |
3087 | iov[0].iov_base = buf; | |
3088 | iov[0].iov_len = (compat_size_t) len; | |
3089 | return 0; | |
3090 | } | |
3091 | #endif | |
3092 | ||
3093 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3094 | bool needs_lock) | |
3095 | { | |
3096 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3097 | void __user *buf; | |
3098 | ssize_t len; | |
3099 | ||
3100 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3101 | return -EFAULT; | |
3102 | ||
3103 | len = iov[0].iov_len; | |
3104 | if (len < 0) | |
3105 | return -EINVAL; | |
3106 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3107 | if (IS_ERR(buf)) | |
3108 | return PTR_ERR(buf); | |
3109 | iov[0].iov_base = buf; | |
3110 | iov[0].iov_len = len; | |
3111 | return 0; | |
3112 | } | |
3113 | ||
3114 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3115 | bool needs_lock) | |
3116 | { | |
dddb3e26 JA |
3117 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3118 | struct io_buffer *kbuf; | |
3119 | ||
3120 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3121 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3122 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3123 | return 0; |
dddb3e26 | 3124 | } |
4d954c25 JA |
3125 | if (!req->rw.len) |
3126 | return 0; | |
3127 | else if (req->rw.len > 1) | |
3128 | return -EINVAL; | |
3129 | ||
3130 | #ifdef CONFIG_COMPAT | |
3131 | if (req->ctx->compat) | |
3132 | return io_compat_import(req, iov, needs_lock); | |
3133 | #endif | |
3134 | ||
3135 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3136 | } | |
3137 | ||
2846c481 | 3138 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
8452fd0c JA |
3139 | struct iovec **iovec, struct iov_iter *iter, |
3140 | bool needs_lock) | |
2b188cc1 | 3141 | { |
9adbd45d JA |
3142 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3143 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3144 | ssize_t ret; |
edafccee JA |
3145 | u8 opcode; |
3146 | ||
d625c6ee | 3147 | opcode = req->opcode; |
7d009165 | 3148 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3149 | *iovec = NULL; |
9adbd45d | 3150 | return io_import_fixed(req, rw, iter); |
edafccee | 3151 | } |
2b188cc1 | 3152 | |
bcda7baa | 3153 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3154 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3155 | return -EINVAL; |
3156 | ||
3a6820f2 | 3157 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3158 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3159 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3160 | if (IS_ERR(buf)) |
4d954c25 | 3161 | return PTR_ERR(buf); |
3f9d6441 | 3162 | req->rw.len = sqe_len; |
bcda7baa JA |
3163 | } |
3164 | ||
3a6820f2 JA |
3165 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3166 | *iovec = NULL; | |
10fc72e4 | 3167 | return ret; |
3a6820f2 JA |
3168 | } |
3169 | ||
4d954c25 JA |
3170 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3171 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3172 | if (!ret) { |
3173 | ret = (*iovec)->iov_len; | |
3174 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3175 | } | |
4d954c25 JA |
3176 | *iovec = NULL; |
3177 | return ret; | |
3178 | } | |
3179 | ||
89cd35c5 CH |
3180 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3181 | req->ctx->compat); | |
2b188cc1 JA |
3182 | } |
3183 | ||
0fef9483 JA |
3184 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3185 | { | |
5b09e37e | 3186 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3187 | } |
3188 | ||
31b51510 | 3189 | /* |
32960613 JA |
3190 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3191 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3192 | */ |
4017eb91 | 3193 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3194 | { |
4017eb91 JA |
3195 | struct kiocb *kiocb = &req->rw.kiocb; |
3196 | struct file *file = req->file; | |
32960613 JA |
3197 | ssize_t ret = 0; |
3198 | ||
3199 | /* | |
3200 | * Don't support polled IO through this interface, and we can't | |
3201 | * support non-blocking either. For the latter, this just causes | |
3202 | * the kiocb to be handled from an async context. | |
3203 | */ | |
3204 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3205 | return -EOPNOTSUPP; | |
3206 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3207 | return -EAGAIN; | |
3208 | ||
3209 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3210 | struct iovec iovec; |
32960613 JA |
3211 | ssize_t nr; |
3212 | ||
311ae9e1 PB |
3213 | if (!iov_iter_is_bvec(iter)) { |
3214 | iovec = iov_iter_iovec(iter); | |
3215 | } else { | |
4017eb91 JA |
3216 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3217 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3218 | } |
3219 | ||
32960613 JA |
3220 | if (rw == READ) { |
3221 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3222 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3223 | } else { |
3224 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3225 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3226 | } |
3227 | ||
3228 | if (nr < 0) { | |
3229 | if (!ret) | |
3230 | ret = nr; | |
3231 | break; | |
3232 | } | |
3233 | ret += nr; | |
3234 | if (nr != iovec.iov_len) | |
3235 | break; | |
4017eb91 JA |
3236 | req->rw.len -= nr; |
3237 | req->rw.addr += nr; | |
32960613 JA |
3238 | iov_iter_advance(iter, nr); |
3239 | } | |
3240 | ||
3241 | return ret; | |
3242 | } | |
3243 | ||
ff6165b2 JA |
3244 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3245 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3246 | { |
e8c2bc1f | 3247 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3248 | |
ff6165b2 | 3249 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3250 | rw->free_iovec = iovec; |
227c0c96 | 3251 | rw->bytes_done = 0; |
ff6165b2 JA |
3252 | /* can only be fixed buffers, no need to do anything */ |
3253 | if (iter->type == ITER_BVEC) | |
3254 | return; | |
b64e3444 | 3255 | if (!iovec) { |
ff6165b2 JA |
3256 | unsigned iov_off = 0; |
3257 | ||
3258 | rw->iter.iov = rw->fast_iov; | |
3259 | if (iter->iov != fast_iov) { | |
3260 | iov_off = iter->iov - fast_iov; | |
3261 | rw->iter.iov += iov_off; | |
3262 | } | |
3263 | if (rw->fast_iov != fast_iov) | |
3264 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3265 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3266 | } else { |
3267 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3268 | } |
3269 | } | |
3270 | ||
e8c2bc1f | 3271 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3272 | { |
e8c2bc1f JA |
3273 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3274 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3275 | return req->async_data == NULL; | |
3d9932a8 XW |
3276 | } |
3277 | ||
e8c2bc1f | 3278 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3279 | { |
e8c2bc1f | 3280 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3281 | return 0; |
3d9932a8 | 3282 | |
e8c2bc1f | 3283 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3284 | } |
3285 | ||
ff6165b2 JA |
3286 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3287 | const struct iovec *fast_iov, | |
227c0c96 | 3288 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3289 | { |
e8c2bc1f | 3290 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3291 | return 0; |
e8c2bc1f JA |
3292 | if (!req->async_data) { |
3293 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3294 | return -ENOMEM; |
b7bb4f7d | 3295 | |
ff6165b2 | 3296 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3297 | } |
b7bb4f7d | 3298 | return 0; |
f67676d1 JA |
3299 | } |
3300 | ||
73debe68 | 3301 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3302 | { |
e8c2bc1f | 3303 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3304 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3305 | ssize_t ret; |
3306 | ||
2846c481 | 3307 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3308 | if (unlikely(ret < 0)) |
3309 | return ret; | |
3310 | ||
ab0b196c PB |
3311 | iorw->bytes_done = 0; |
3312 | iorw->free_iovec = iov; | |
3313 | if (iov) | |
3314 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3315 | return 0; |
3316 | } | |
3317 | ||
73debe68 | 3318 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3319 | { |
3320 | ssize_t ret; | |
3321 | ||
a88fc400 | 3322 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3323 | if (ret) |
3324 | return ret; | |
f67676d1 | 3325 | |
3529d8c2 JA |
3326 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3327 | return -EBADF; | |
f67676d1 | 3328 | |
5f798bea | 3329 | /* either don't need iovec imported or already have it */ |
2d199895 | 3330 | if (!req->async_data) |
3529d8c2 | 3331 | return 0; |
73debe68 | 3332 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3333 | } |
3334 | ||
c1dd91d1 JA |
3335 | /* |
3336 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3337 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3338 | * This gets called when the page is unlocked, and we generally expect that to | |
3339 | * happen when the page IO is completed and the page is now uptodate. This will | |
3340 | * queue a task_work based retry of the operation, attempting to copy the data | |
3341 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3342 | * do a thread based blocking retry of the operation. That's the unexpected | |
3343 | * slow path. | |
3344 | */ | |
bcf5a063 JA |
3345 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3346 | int sync, void *arg) | |
3347 | { | |
3348 | struct wait_page_queue *wpq; | |
3349 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3350 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3351 | int ret; |
3352 | ||
3353 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3354 | ||
cdc8fcb4 LT |
3355 | if (!wake_page_match(wpq, key)) |
3356 | return 0; | |
3357 | ||
c8d317aa | 3358 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3359 | list_del_init(&wait->entry); |
3360 | ||
e7375122 | 3361 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3362 | percpu_ref_get(&req->ctx->refs); |
3363 | ||
bcf5a063 JA |
3364 | /* submit ref gets dropped, acquire a new one */ |
3365 | refcount_inc(&req->refs); | |
87c4311f | 3366 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3367 | if (unlikely(ret)) { |
c2c4c83c JA |
3368 | struct task_struct *tsk; |
3369 | ||
bcf5a063 | 3370 | /* queue just for cancelation */ |
e7375122 | 3371 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3372 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3373 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3374 | wake_up_process(tsk); |
bcf5a063 | 3375 | } |
bcf5a063 JA |
3376 | return 1; |
3377 | } | |
3378 | ||
c1dd91d1 JA |
3379 | /* |
3380 | * This controls whether a given IO request should be armed for async page | |
3381 | * based retry. If we return false here, the request is handed to the async | |
3382 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3383 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3384 | * will either succeed because the page is now uptodate and unlocked, or it | |
3385 | * will register a callback when the page is unlocked at IO completion. Through | |
3386 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3387 | * That retry will attempt the buffered read again. The retry will generally | |
3388 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3389 | * async worker threads for a blocking retry. | |
3390 | */ | |
227c0c96 | 3391 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3392 | { |
e8c2bc1f JA |
3393 | struct io_async_rw *rw = req->async_data; |
3394 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3395 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3396 | |
bcf5a063 JA |
3397 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3398 | if (req->flags & REQ_F_NOWAIT) | |
3399 | return false; | |
f67676d1 | 3400 | |
227c0c96 | 3401 | /* Only for buffered IO */ |
3b2a4439 | 3402 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3403 | return false; |
3b2a4439 | 3404 | |
bcf5a063 JA |
3405 | /* |
3406 | * just use poll if we can, and don't attempt if the fs doesn't | |
3407 | * support callback based unlocks | |
3408 | */ | |
3409 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3410 | return false; | |
f67676d1 | 3411 | |
3b2a4439 JA |
3412 | wait->wait.func = io_async_buf_func; |
3413 | wait->wait.private = req; | |
3414 | wait->wait.flags = 0; | |
3415 | INIT_LIST_HEAD(&wait->wait.entry); | |
3416 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3417 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3418 | kiocb->ki_waitq = wait; |
3b2a4439 | 3419 | return true; |
bcf5a063 JA |
3420 | } |
3421 | ||
3422 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3423 | { | |
3424 | if (req->file->f_op->read_iter) | |
3425 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3426 | else if (req->file->f_op->read) |
4017eb91 | 3427 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3428 | else |
3429 | return -EINVAL; | |
f67676d1 JA |
3430 | } |
3431 | ||
a1d7c393 JA |
3432 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3433 | struct io_comp_state *cs) | |
2b188cc1 JA |
3434 | { |
3435 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3436 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3437 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3438 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3439 | ssize_t io_size, ret, ret2; |
f5cac8b1 | 3440 | bool no_async; |
ff6165b2 | 3441 | |
2846c481 | 3442 | if (rw) { |
e8c2bc1f | 3443 | iter = &rw->iter; |
2846c481 PB |
3444 | iovec = NULL; |
3445 | } else { | |
3446 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3447 | if (ret < 0) | |
3448 | return ret; | |
3449 | } | |
632546c4 | 3450 | io_size = iov_iter_count(iter); |
fa15bafb | 3451 | req->result = io_size; |
227c0c96 | 3452 | ret = 0; |
2b188cc1 | 3453 | |
fd6c2e4c JA |
3454 | /* Ensure we clear previously set non-block flag */ |
3455 | if (!force_nonblock) | |
29de5f6a | 3456 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3457 | else |
3458 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3459 | ||
fd6c2e4c | 3460 | |
24c74678 | 3461 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3462 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3463 | if (no_async) | |
f67676d1 | 3464 | goto copy_iov; |
9e645e11 | 3465 | |
632546c4 | 3466 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3467 | if (unlikely(ret)) |
3468 | goto out_free; | |
2b188cc1 | 3469 | |
227c0c96 | 3470 | ret = io_iter_do_read(req, iter); |
32960613 | 3471 | |
227c0c96 JA |
3472 | if (!ret) { |
3473 | goto done; | |
3474 | } else if (ret == -EIOCBQUEUED) { | |
3475 | ret = 0; | |
3476 | goto out_free; | |
3477 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3478 | /* IOPOLL retry should happen for io-wq threads */ |
3479 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3480 | goto done; |
355afaeb JA |
3481 | /* no retry on NONBLOCK marked file */ |
3482 | if (req->file->f_flags & O_NONBLOCK) | |
3483 | goto done; | |
84216315 | 3484 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3485 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a JA |
3486 | ret = 0; |
3487 | goto copy_iov; | |
227c0c96 | 3488 | } else if (ret < 0) { |
00d23d51 JA |
3489 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3490 | goto done; | |
227c0c96 JA |
3491 | } |
3492 | ||
3493 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3494 | if (!iov_iter_count(iter) || !force_nonblock || |
3495 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3496 | goto done; |
3497 | ||
3498 | io_size -= ret; | |
3499 | copy_iov: | |
3500 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3501 | if (ret2) { | |
3502 | ret = ret2; | |
3503 | goto out_free; | |
3504 | } | |
f5cac8b1 JA |
3505 | if (no_async) |
3506 | return -EAGAIN; | |
e8c2bc1f | 3507 | rw = req->async_data; |
227c0c96 JA |
3508 | /* it's copied and will be cleaned with ->io */ |
3509 | iovec = NULL; | |
3510 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3511 | iter = &rw->iter; |
227c0c96 | 3512 | retry: |
e8c2bc1f | 3513 | rw->bytes_done += ret; |
227c0c96 JA |
3514 | /* if we can retry, do so with the callbacks armed */ |
3515 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3516 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3517 | return -EAGAIN; | |
2b188cc1 | 3518 | } |
227c0c96 JA |
3519 | |
3520 | /* | |
3521 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3522 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3523 | * page gets unlocked. We can also get a partial read here, and if we | |
3524 | * do, then just retry at the new offset. | |
3525 | */ | |
3526 | ret = io_iter_do_read(req, iter); | |
3527 | if (ret == -EIOCBQUEUED) { | |
3528 | ret = 0; | |
3529 | goto out_free; | |
3530 | } else if (ret > 0 && ret < io_size) { | |
3531 | /* we got some bytes, but not all. retry. */ | |
3532 | goto retry; | |
3533 | } | |
3534 | done: | |
3535 | kiocb_done(kiocb, ret, cs); | |
3536 | ret = 0; | |
f67676d1 | 3537 | out_free: |
f261c168 | 3538 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3539 | if (iovec) |
6f2cc166 | 3540 | kfree(iovec); |
2b188cc1 JA |
3541 | return ret; |
3542 | } | |
3543 | ||
73debe68 | 3544 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3545 | { |
3546 | ssize_t ret; | |
3547 | ||
a88fc400 | 3548 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3549 | if (ret) |
3550 | return ret; | |
f67676d1 | 3551 | |
3529d8c2 JA |
3552 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3553 | return -EBADF; | |
f67676d1 | 3554 | |
5f798bea | 3555 | /* either don't need iovec imported or already have it */ |
2d199895 | 3556 | if (!req->async_data) |
3529d8c2 | 3557 | return 0; |
73debe68 | 3558 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3559 | } |
3560 | ||
a1d7c393 JA |
3561 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3562 | struct io_comp_state *cs) | |
2b188cc1 JA |
3563 | { |
3564 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3565 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3566 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3567 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3568 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3569 | |
2846c481 | 3570 | if (rw) { |
e8c2bc1f | 3571 | iter = &rw->iter; |
2846c481 PB |
3572 | iovec = NULL; |
3573 | } else { | |
3574 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3575 | if (ret < 0) | |
3576 | return ret; | |
3577 | } | |
632546c4 | 3578 | io_size = iov_iter_count(iter); |
fa15bafb | 3579 | req->result = io_size; |
2b188cc1 | 3580 | |
fd6c2e4c JA |
3581 | /* Ensure we clear previously set non-block flag */ |
3582 | if (!force_nonblock) | |
a88fc400 PB |
3583 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3584 | else | |
3585 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3586 | |
24c74678 | 3587 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3588 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3589 | goto copy_iov; |
31b51510 | 3590 | |
10d59345 JA |
3591 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3592 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3593 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3594 | goto copy_iov; |
31b51510 | 3595 | |
632546c4 | 3596 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3597 | if (unlikely(ret)) |
3598 | goto out_free; | |
4ed734b0 | 3599 | |
fa15bafb PB |
3600 | /* |
3601 | * Open-code file_start_write here to grab freeze protection, | |
3602 | * which will be released by another thread in | |
3603 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3604 | * released so that it doesn't complain about the held lock when | |
3605 | * we return to userspace. | |
3606 | */ | |
3607 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3608 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3609 | __sb_writers_release(file_inode(req->file)->i_sb, |
3610 | SB_FREEZE_WRITE); | |
3611 | } | |
3612 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3613 | |
fa15bafb | 3614 | if (req->file->f_op->write_iter) |
ff6165b2 | 3615 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3616 | else if (req->file->f_op->write) |
4017eb91 | 3617 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3618 | else |
3619 | ret2 = -EINVAL; | |
4ed734b0 | 3620 | |
fa15bafb PB |
3621 | /* |
3622 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3623 | * retry them without IOCB_NOWAIT. | |
3624 | */ | |
3625 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3626 | ret2 = -EAGAIN; | |
355afaeb JA |
3627 | /* no retry on NONBLOCK marked file */ |
3628 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3629 | goto done; | |
fa15bafb | 3630 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3631 | /* IOPOLL retry should happen for io-wq threads */ |
3632 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3633 | goto copy_iov; | |
355afaeb | 3634 | done: |
fa15bafb PB |
3635 | kiocb_done(kiocb, ret2, cs); |
3636 | } else { | |
f67676d1 | 3637 | copy_iov: |
84216315 | 3638 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3639 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3640 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3641 | if (!ret) |
3642 | return -EAGAIN; | |
2b188cc1 | 3643 | } |
31b51510 | 3644 | out_free: |
f261c168 | 3645 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3646 | if (iovec) |
6f2cc166 | 3647 | kfree(iovec); |
2b188cc1 JA |
3648 | return ret; |
3649 | } | |
3650 | ||
80a261fd JA |
3651 | static int io_renameat_prep(struct io_kiocb *req, |
3652 | const struct io_uring_sqe *sqe) | |
3653 | { | |
3654 | struct io_rename *ren = &req->rename; | |
3655 | const char __user *oldf, *newf; | |
3656 | ||
3657 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3658 | return -EBADF; | |
3659 | ||
3660 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3661 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3662 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3663 | ren->new_dfd = READ_ONCE(sqe->len); | |
3664 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3665 | ||
3666 | ren->oldpath = getname(oldf); | |
3667 | if (IS_ERR(ren->oldpath)) | |
3668 | return PTR_ERR(ren->oldpath); | |
3669 | ||
3670 | ren->newpath = getname(newf); | |
3671 | if (IS_ERR(ren->newpath)) { | |
3672 | putname(ren->oldpath); | |
3673 | return PTR_ERR(ren->newpath); | |
3674 | } | |
3675 | ||
3676 | req->flags |= REQ_F_NEED_CLEANUP; | |
3677 | return 0; | |
3678 | } | |
3679 | ||
3680 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3681 | { | |
3682 | struct io_rename *ren = &req->rename; | |
3683 | int ret; | |
3684 | ||
3685 | if (force_nonblock) | |
3686 | return -EAGAIN; | |
3687 | ||
3688 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3689 | ren->newpath, ren->flags); | |
3690 | ||
3691 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3692 | if (ret < 0) | |
3693 | req_set_fail_links(req); | |
3694 | io_req_complete(req, ret); | |
3695 | return 0; | |
3696 | } | |
3697 | ||
14a1143b JA |
3698 | static int io_unlinkat_prep(struct io_kiocb *req, |
3699 | const struct io_uring_sqe *sqe) | |
3700 | { | |
3701 | struct io_unlink *un = &req->unlink; | |
3702 | const char __user *fname; | |
3703 | ||
3704 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3705 | return -EBADF; | |
3706 | ||
3707 | un->dfd = READ_ONCE(sqe->fd); | |
3708 | ||
3709 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3710 | if (un->flags & ~AT_REMOVEDIR) | |
3711 | return -EINVAL; | |
3712 | ||
3713 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3714 | un->filename = getname(fname); | |
3715 | if (IS_ERR(un->filename)) | |
3716 | return PTR_ERR(un->filename); | |
3717 | ||
3718 | req->flags |= REQ_F_NEED_CLEANUP; | |
3719 | return 0; | |
3720 | } | |
3721 | ||
3722 | static int io_unlinkat(struct io_kiocb *req, bool force_nonblock) | |
3723 | { | |
3724 | struct io_unlink *un = &req->unlink; | |
3725 | int ret; | |
3726 | ||
3727 | if (force_nonblock) | |
3728 | return -EAGAIN; | |
3729 | ||
3730 | if (un->flags & AT_REMOVEDIR) | |
3731 | ret = do_rmdir(un->dfd, un->filename); | |
3732 | else | |
3733 | ret = do_unlinkat(un->dfd, un->filename); | |
3734 | ||
3735 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3736 | if (ret < 0) | |
3737 | req_set_fail_links(req); | |
3738 | io_req_complete(req, ret); | |
3739 | return 0; | |
3740 | } | |
3741 | ||
36f4fa68 JA |
3742 | static int io_shutdown_prep(struct io_kiocb *req, |
3743 | const struct io_uring_sqe *sqe) | |
3744 | { | |
3745 | #if defined(CONFIG_NET) | |
3746 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3747 | return -EINVAL; | |
3748 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3749 | sqe->buf_index) | |
3750 | return -EINVAL; | |
3751 | ||
3752 | req->shutdown.how = READ_ONCE(sqe->len); | |
3753 | return 0; | |
3754 | #else | |
3755 | return -EOPNOTSUPP; | |
3756 | #endif | |
3757 | } | |
3758 | ||
3759 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3760 | { | |
3761 | #if defined(CONFIG_NET) | |
3762 | struct socket *sock; | |
3763 | int ret; | |
3764 | ||
3765 | if (force_nonblock) | |
3766 | return -EAGAIN; | |
3767 | ||
3768 | sock = sock_from_file(req->file, &ret); | |
3769 | if (unlikely(!sock)) | |
3770 | return ret; | |
3771 | ||
3772 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
3773 | io_req_complete(req, ret); | |
3774 | return 0; | |
3775 | #else | |
3776 | return -EOPNOTSUPP; | |
3777 | #endif | |
3778 | } | |
3779 | ||
f2a8d5c7 PB |
3780 | static int __io_splice_prep(struct io_kiocb *req, |
3781 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3782 | { |
3783 | struct io_splice* sp = &req->splice; | |
3784 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3785 | |
3232dd02 PB |
3786 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3787 | return -EINVAL; | |
7d67af2c PB |
3788 | |
3789 | sp->file_in = NULL; | |
7d67af2c PB |
3790 | sp->len = READ_ONCE(sqe->len); |
3791 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3792 | ||
3793 | if (unlikely(sp->flags & ~valid_flags)) | |
3794 | return -EINVAL; | |
3795 | ||
8371adf5 PB |
3796 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3797 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3798 | if (!sp->file_in) | |
3799 | return -EBADF; | |
7d67af2c PB |
3800 | req->flags |= REQ_F_NEED_CLEANUP; |
3801 | ||
7cdaf587 XW |
3802 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3803 | /* | |
3804 | * Splice operation will be punted aync, and here need to | |
3805 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3806 | */ | |
3807 | io_req_init_async(req); | |
7d67af2c | 3808 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3809 | } |
7d67af2c PB |
3810 | |
3811 | return 0; | |
3812 | } | |
3813 | ||
f2a8d5c7 PB |
3814 | static int io_tee_prep(struct io_kiocb *req, |
3815 | const struct io_uring_sqe *sqe) | |
3816 | { | |
3817 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3818 | return -EINVAL; | |
3819 | return __io_splice_prep(req, sqe); | |
3820 | } | |
3821 | ||
3822 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3823 | { | |
3824 | struct io_splice *sp = &req->splice; | |
3825 | struct file *in = sp->file_in; | |
3826 | struct file *out = sp->file_out; | |
3827 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3828 | long ret = 0; | |
3829 | ||
3830 | if (force_nonblock) | |
3831 | return -EAGAIN; | |
3832 | if (sp->len) | |
3833 | ret = do_tee(in, out, sp->len, flags); | |
3834 | ||
3835 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3836 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3837 | ||
f2a8d5c7 PB |
3838 | if (ret != sp->len) |
3839 | req_set_fail_links(req); | |
e1e16097 | 3840 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3841 | return 0; |
3842 | } | |
3843 | ||
3844 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3845 | { | |
3846 | struct io_splice* sp = &req->splice; | |
3847 | ||
3848 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3849 | sp->off_out = READ_ONCE(sqe->off); | |
3850 | return __io_splice_prep(req, sqe); | |
3851 | } | |
3852 | ||
014db007 | 3853 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3854 | { |
3855 | struct io_splice *sp = &req->splice; | |
3856 | struct file *in = sp->file_in; | |
3857 | struct file *out = sp->file_out; | |
3858 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3859 | loff_t *poff_in, *poff_out; | |
c9687426 | 3860 | long ret = 0; |
7d67af2c | 3861 | |
2fb3e822 PB |
3862 | if (force_nonblock) |
3863 | return -EAGAIN; | |
7d67af2c PB |
3864 | |
3865 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3866 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3867 | |
948a7749 | 3868 | if (sp->len) |
c9687426 | 3869 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3870 | |
3871 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3872 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3873 | ||
7d67af2c PB |
3874 | if (ret != sp->len) |
3875 | req_set_fail_links(req); | |
e1e16097 | 3876 | io_req_complete(req, ret); |
7d67af2c PB |
3877 | return 0; |
3878 | } | |
3879 | ||
2b188cc1 JA |
3880 | /* |
3881 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3882 | */ | |
229a7b63 | 3883 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3884 | { |
3885 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3886 | |
def596e9 JA |
3887 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3888 | return -EINVAL; | |
3889 | ||
229a7b63 | 3890 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3891 | return 0; |
3892 | } | |
3893 | ||
3529d8c2 | 3894 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3895 | { |
6b06314c | 3896 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3897 | |
09bb8394 JA |
3898 | if (!req->file) |
3899 | return -EBADF; | |
c992fe29 | 3900 | |
6b06314c | 3901 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3902 | return -EINVAL; |
edafccee | 3903 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3904 | return -EINVAL; |
3905 | ||
8ed8d3c3 JA |
3906 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3907 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3908 | return -EINVAL; | |
3909 | ||
3910 | req->sync.off = READ_ONCE(sqe->off); | |
3911 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3912 | return 0; |
3913 | } | |
3914 | ||
ac45abc0 | 3915 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3916 | { |
8ed8d3c3 | 3917 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3918 | int ret; |
3919 | ||
ac45abc0 PB |
3920 | /* fsync always requires a blocking context */ |
3921 | if (force_nonblock) | |
3922 | return -EAGAIN; | |
3923 | ||
9adbd45d | 3924 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3925 | end > 0 ? end : LLONG_MAX, |
3926 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3927 | if (ret < 0) | |
3928 | req_set_fail_links(req); | |
e1e16097 | 3929 | io_req_complete(req, ret); |
c992fe29 CH |
3930 | return 0; |
3931 | } | |
3932 | ||
d63d1b5e JA |
3933 | static int io_fallocate_prep(struct io_kiocb *req, |
3934 | const struct io_uring_sqe *sqe) | |
3935 | { | |
3936 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3937 | return -EINVAL; | |
3232dd02 PB |
3938 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3939 | return -EINVAL; | |
d63d1b5e JA |
3940 | |
3941 | req->sync.off = READ_ONCE(sqe->off); | |
3942 | req->sync.len = READ_ONCE(sqe->addr); | |
3943 | req->sync.mode = READ_ONCE(sqe->len); | |
3944 | return 0; | |
3945 | } | |
3946 | ||
014db007 | 3947 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3948 | { |
ac45abc0 PB |
3949 | int ret; |
3950 | ||
d63d1b5e | 3951 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3952 | if (force_nonblock) |
5d17b4a4 | 3953 | return -EAGAIN; |
ac45abc0 PB |
3954 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3955 | req->sync.len); | |
ac45abc0 PB |
3956 | if (ret < 0) |
3957 | req_set_fail_links(req); | |
e1e16097 | 3958 | io_req_complete(req, ret); |
5d17b4a4 JA |
3959 | return 0; |
3960 | } | |
3961 | ||
ec65fea5 | 3962 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3963 | { |
f8748881 | 3964 | const char __user *fname; |
15b71abe | 3965 | int ret; |
b7bb4f7d | 3966 | |
ec65fea5 | 3967 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3968 | return -EINVAL; |
ec65fea5 | 3969 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3970 | return -EBADF; |
03b1230c | 3971 | |
ec65fea5 PB |
3972 | /* open.how should be already initialised */ |
3973 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3974 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3975 | |
25e72d10 PB |
3976 | req->open.dfd = READ_ONCE(sqe->fd); |
3977 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3978 | req->open.filename = getname(fname); |
15b71abe JA |
3979 | if (IS_ERR(req->open.filename)) { |
3980 | ret = PTR_ERR(req->open.filename); | |
3981 | req->open.filename = NULL; | |
3982 | return ret; | |
3983 | } | |
4022e7af | 3984 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
944d1444 | 3985 | req->open.ignore_nonblock = false; |
8fef80bf | 3986 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3987 | return 0; |
03b1230c JA |
3988 | } |
3989 | ||
ec65fea5 PB |
3990 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3991 | { | |
3992 | u64 flags, mode; | |
3993 | ||
14587a46 | 3994 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3995 | return -EINVAL; |
ec65fea5 PB |
3996 | mode = READ_ONCE(sqe->len); |
3997 | flags = READ_ONCE(sqe->open_flags); | |
3998 | req->open.how = build_open_how(flags, mode); | |
3999 | return __io_openat_prep(req, sqe); | |
4000 | } | |
4001 | ||
cebdb986 | 4002 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4003 | { |
cebdb986 | 4004 | struct open_how __user *how; |
cebdb986 | 4005 | size_t len; |
0fa03c62 JA |
4006 | int ret; |
4007 | ||
14587a46 | 4008 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4009 | return -EINVAL; |
cebdb986 JA |
4010 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4011 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4012 | if (len < OPEN_HOW_SIZE_VER0) |
4013 | return -EINVAL; | |
3529d8c2 | 4014 | |
cebdb986 JA |
4015 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4016 | len); | |
4017 | if (ret) | |
4018 | return ret; | |
3529d8c2 | 4019 | |
ec65fea5 | 4020 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4021 | } |
4022 | ||
014db007 | 4023 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
4024 | { |
4025 | struct open_flags op; | |
15b71abe JA |
4026 | struct file *file; |
4027 | int ret; | |
4028 | ||
944d1444 | 4029 | if (force_nonblock && !req->open.ignore_nonblock) |
15b71abe | 4030 | return -EAGAIN; |
15b71abe | 4031 | |
cebdb986 | 4032 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4033 | if (ret) |
4034 | goto err; | |
4035 | ||
4022e7af | 4036 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4037 | if (ret < 0) |
4038 | goto err; | |
4039 | ||
4040 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
4041 | if (IS_ERR(file)) { | |
4042 | put_unused_fd(ret); | |
4043 | ret = PTR_ERR(file); | |
944d1444 JA |
4044 | /* |
4045 | * A work-around to ensure that /proc/self works that way | |
4046 | * that it should - if we get -EOPNOTSUPP back, then assume | |
4047 | * that proc_self_get_link() failed us because we're in async | |
4048 | * context. We should be safe to retry this from the task | |
4049 | * itself with force_nonblock == false set, as it should not | |
4050 | * block on lookup. Would be nice to know this upfront and | |
4051 | * avoid the async dance, but doesn't seem feasible. | |
4052 | */ | |
4053 | if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) { | |
4054 | req->open.ignore_nonblock = true; | |
4055 | refcount_inc(&req->refs); | |
4056 | io_req_task_queue(req); | |
4057 | return 0; | |
4058 | } | |
15b71abe JA |
4059 | } else { |
4060 | fsnotify_open(file); | |
4061 | fd_install(ret, file); | |
4062 | } | |
4063 | err: | |
4064 | putname(req->open.filename); | |
8fef80bf | 4065 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4066 | if (ret < 0) |
4067 | req_set_fail_links(req); | |
e1e16097 | 4068 | io_req_complete(req, ret); |
15b71abe JA |
4069 | return 0; |
4070 | } | |
4071 | ||
014db007 | 4072 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4073 | { |
014db007 | 4074 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4075 | } |
4076 | ||
067524e9 JA |
4077 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4078 | const struct io_uring_sqe *sqe) | |
4079 | { | |
4080 | struct io_provide_buf *p = &req->pbuf; | |
4081 | u64 tmp; | |
4082 | ||
4083 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4084 | return -EINVAL; | |
4085 | ||
4086 | tmp = READ_ONCE(sqe->fd); | |
4087 | if (!tmp || tmp > USHRT_MAX) | |
4088 | return -EINVAL; | |
4089 | ||
4090 | memset(p, 0, sizeof(*p)); | |
4091 | p->nbufs = tmp; | |
4092 | p->bgid = READ_ONCE(sqe->buf_group); | |
4093 | return 0; | |
4094 | } | |
4095 | ||
4096 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4097 | int bgid, unsigned nbufs) | |
4098 | { | |
4099 | unsigned i = 0; | |
4100 | ||
4101 | /* shouldn't happen */ | |
4102 | if (!nbufs) | |
4103 | return 0; | |
4104 | ||
4105 | /* the head kbuf is the list itself */ | |
4106 | while (!list_empty(&buf->list)) { | |
4107 | struct io_buffer *nxt; | |
4108 | ||
4109 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4110 | list_del(&nxt->list); | |
4111 | kfree(nxt); | |
4112 | if (++i == nbufs) | |
4113 | return i; | |
4114 | } | |
4115 | i++; | |
4116 | kfree(buf); | |
4117 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4118 | ||
4119 | return i; | |
4120 | } | |
4121 | ||
229a7b63 JA |
4122 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4123 | struct io_comp_state *cs) | |
067524e9 JA |
4124 | { |
4125 | struct io_provide_buf *p = &req->pbuf; | |
4126 | struct io_ring_ctx *ctx = req->ctx; | |
4127 | struct io_buffer *head; | |
4128 | int ret = 0; | |
4129 | ||
4130 | io_ring_submit_lock(ctx, !force_nonblock); | |
4131 | ||
4132 | lockdep_assert_held(&ctx->uring_lock); | |
4133 | ||
4134 | ret = -ENOENT; | |
4135 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4136 | if (head) | |
4137 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
4138 | ||
4139 | io_ring_submit_lock(ctx, !force_nonblock); | |
4140 | if (ret < 0) | |
4141 | req_set_fail_links(req); | |
229a7b63 | 4142 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
4143 | return 0; |
4144 | } | |
4145 | ||
ddf0322d JA |
4146 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4147 | const struct io_uring_sqe *sqe) | |
4148 | { | |
4149 | struct io_provide_buf *p = &req->pbuf; | |
4150 | u64 tmp; | |
4151 | ||
4152 | if (sqe->ioprio || sqe->rw_flags) | |
4153 | return -EINVAL; | |
4154 | ||
4155 | tmp = READ_ONCE(sqe->fd); | |
4156 | if (!tmp || tmp > USHRT_MAX) | |
4157 | return -E2BIG; | |
4158 | p->nbufs = tmp; | |
4159 | p->addr = READ_ONCE(sqe->addr); | |
4160 | p->len = READ_ONCE(sqe->len); | |
4161 | ||
efe68c1c | 4162 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4163 | return -EFAULT; |
4164 | ||
4165 | p->bgid = READ_ONCE(sqe->buf_group); | |
4166 | tmp = READ_ONCE(sqe->off); | |
4167 | if (tmp > USHRT_MAX) | |
4168 | return -E2BIG; | |
4169 | p->bid = tmp; | |
4170 | return 0; | |
4171 | } | |
4172 | ||
4173 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4174 | { | |
4175 | struct io_buffer *buf; | |
4176 | u64 addr = pbuf->addr; | |
4177 | int i, bid = pbuf->bid; | |
4178 | ||
4179 | for (i = 0; i < pbuf->nbufs; i++) { | |
4180 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4181 | if (!buf) | |
4182 | break; | |
4183 | ||
4184 | buf->addr = addr; | |
4185 | buf->len = pbuf->len; | |
4186 | buf->bid = bid; | |
4187 | addr += pbuf->len; | |
4188 | bid++; | |
4189 | if (!*head) { | |
4190 | INIT_LIST_HEAD(&buf->list); | |
4191 | *head = buf; | |
4192 | } else { | |
4193 | list_add_tail(&buf->list, &(*head)->list); | |
4194 | } | |
4195 | } | |
4196 | ||
4197 | return i ? i : -ENOMEM; | |
4198 | } | |
4199 | ||
229a7b63 JA |
4200 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4201 | struct io_comp_state *cs) | |
ddf0322d JA |
4202 | { |
4203 | struct io_provide_buf *p = &req->pbuf; | |
4204 | struct io_ring_ctx *ctx = req->ctx; | |
4205 | struct io_buffer *head, *list; | |
4206 | int ret = 0; | |
4207 | ||
4208 | io_ring_submit_lock(ctx, !force_nonblock); | |
4209 | ||
4210 | lockdep_assert_held(&ctx->uring_lock); | |
4211 | ||
4212 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4213 | ||
4214 | ret = io_add_buffers(p, &head); | |
4215 | if (ret < 0) | |
4216 | goto out; | |
4217 | ||
4218 | if (!list) { | |
4219 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4220 | GFP_KERNEL); | |
4221 | if (ret < 0) { | |
067524e9 | 4222 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4223 | goto out; |
4224 | } | |
4225 | } | |
4226 | out: | |
4227 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4228 | if (ret < 0) | |
4229 | req_set_fail_links(req); | |
229a7b63 | 4230 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4231 | return 0; |
cebdb986 JA |
4232 | } |
4233 | ||
3e4827b0 JA |
4234 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4235 | const struct io_uring_sqe *sqe) | |
4236 | { | |
4237 | #if defined(CONFIG_EPOLL) | |
4238 | if (sqe->ioprio || sqe->buf_index) | |
4239 | return -EINVAL; | |
6ca56f84 | 4240 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4241 | return -EINVAL; |
3e4827b0 JA |
4242 | |
4243 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4244 | req->epoll.op = READ_ONCE(sqe->len); | |
4245 | req->epoll.fd = READ_ONCE(sqe->off); | |
4246 | ||
4247 | if (ep_op_has_event(req->epoll.op)) { | |
4248 | struct epoll_event __user *ev; | |
4249 | ||
4250 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4251 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4252 | return -EFAULT; | |
4253 | } | |
4254 | ||
4255 | return 0; | |
4256 | #else | |
4257 | return -EOPNOTSUPP; | |
4258 | #endif | |
4259 | } | |
4260 | ||
229a7b63 JA |
4261 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4262 | struct io_comp_state *cs) | |
3e4827b0 JA |
4263 | { |
4264 | #if defined(CONFIG_EPOLL) | |
4265 | struct io_epoll *ie = &req->epoll; | |
4266 | int ret; | |
4267 | ||
4268 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4269 | if (force_nonblock && ret == -EAGAIN) | |
4270 | return -EAGAIN; | |
4271 | ||
4272 | if (ret < 0) | |
4273 | req_set_fail_links(req); | |
229a7b63 | 4274 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4275 | return 0; |
4276 | #else | |
4277 | return -EOPNOTSUPP; | |
4278 | #endif | |
4279 | } | |
4280 | ||
c1ca757b JA |
4281 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4282 | { | |
4283 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4284 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4285 | return -EINVAL; | |
3232dd02 PB |
4286 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4287 | return -EINVAL; | |
c1ca757b JA |
4288 | |
4289 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4290 | req->madvise.len = READ_ONCE(sqe->len); | |
4291 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4292 | return 0; | |
4293 | #else | |
4294 | return -EOPNOTSUPP; | |
4295 | #endif | |
4296 | } | |
4297 | ||
014db007 | 4298 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4299 | { |
4300 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4301 | struct io_madvise *ma = &req->madvise; | |
4302 | int ret; | |
4303 | ||
4304 | if (force_nonblock) | |
4305 | return -EAGAIN; | |
4306 | ||
0726b01e | 4307 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4308 | if (ret < 0) |
4309 | req_set_fail_links(req); | |
e1e16097 | 4310 | io_req_complete(req, ret); |
c1ca757b JA |
4311 | return 0; |
4312 | #else | |
4313 | return -EOPNOTSUPP; | |
4314 | #endif | |
4315 | } | |
4316 | ||
4840e418 JA |
4317 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4318 | { | |
4319 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4320 | return -EINVAL; | |
3232dd02 PB |
4321 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4322 | return -EINVAL; | |
4840e418 JA |
4323 | |
4324 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4325 | req->fadvise.len = READ_ONCE(sqe->len); | |
4326 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4327 | return 0; | |
4328 | } | |
4329 | ||
014db007 | 4330 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4331 | { |
4332 | struct io_fadvise *fa = &req->fadvise; | |
4333 | int ret; | |
4334 | ||
3e69426d JA |
4335 | if (force_nonblock) { |
4336 | switch (fa->advice) { | |
4337 | case POSIX_FADV_NORMAL: | |
4338 | case POSIX_FADV_RANDOM: | |
4339 | case POSIX_FADV_SEQUENTIAL: | |
4340 | break; | |
4341 | default: | |
4342 | return -EAGAIN; | |
4343 | } | |
4344 | } | |
4840e418 JA |
4345 | |
4346 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4347 | if (ret < 0) | |
4348 | req_set_fail_links(req); | |
e1e16097 | 4349 | io_req_complete(req, ret); |
4840e418 JA |
4350 | return 0; |
4351 | } | |
4352 | ||
eddc7ef5 JA |
4353 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4354 | { | |
6ca56f84 | 4355 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4356 | return -EINVAL; |
eddc7ef5 JA |
4357 | if (sqe->ioprio || sqe->buf_index) |
4358 | return -EINVAL; | |
9c280f90 | 4359 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4360 | return -EBADF; |
eddc7ef5 | 4361 | |
1d9e1288 BM |
4362 | req->statx.dfd = READ_ONCE(sqe->fd); |
4363 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4364 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4365 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4366 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4367 | |
4368 | return 0; | |
4369 | } | |
4370 | ||
014db007 | 4371 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4372 | { |
1d9e1288 | 4373 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4374 | int ret; |
4375 | ||
5b0bbee4 JA |
4376 | if (force_nonblock) { |
4377 | /* only need file table for an actual valid fd */ | |
4378 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4379 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4380 | return -EAGAIN; |
5b0bbee4 | 4381 | } |
eddc7ef5 | 4382 | |
e62753e4 BM |
4383 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4384 | ctx->buffer); | |
eddc7ef5 | 4385 | |
eddc7ef5 JA |
4386 | if (ret < 0) |
4387 | req_set_fail_links(req); | |
e1e16097 | 4388 | io_req_complete(req, ret); |
eddc7ef5 JA |
4389 | return 0; |
4390 | } | |
4391 | ||
b5dba59e JA |
4392 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4393 | { | |
4394 | /* | |
4395 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4396 | * leave the 'file' in an undeterminate state, and here need to modify |
4397 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4398 | */ |
7cdaf587 | 4399 | io_req_init_async(req); |
b5dba59e JA |
4400 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4401 | ||
14587a46 | 4402 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4403 | return -EINVAL; |
b5dba59e JA |
4404 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4405 | sqe->rw_flags || sqe->buf_index) | |
4406 | return -EINVAL; | |
9c280f90 | 4407 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4408 | return -EBADF; |
b5dba59e JA |
4409 | |
4410 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4411 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4412 | return -EBADF; |
b5dba59e | 4413 | |
3af73b28 | 4414 | req->close.put_file = NULL; |
b5dba59e | 4415 | return 0; |
b5dba59e JA |
4416 | } |
4417 | ||
229a7b63 JA |
4418 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4419 | struct io_comp_state *cs) | |
b5dba59e | 4420 | { |
3af73b28 | 4421 | struct io_close *close = &req->close; |
b5dba59e JA |
4422 | int ret; |
4423 | ||
3af73b28 PB |
4424 | /* might be already done during nonblock submission */ |
4425 | if (!close->put_file) { | |
4426 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4427 | if (ret < 0) | |
4428 | return (ret == -ENOENT) ? -EBADF : ret; | |
4429 | } | |
b5dba59e JA |
4430 | |
4431 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4432 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4433 | /* was never set, but play safe */ |
4434 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4435 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4436 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4437 | return -EAGAIN; |
a2100672 | 4438 | } |
b5dba59e | 4439 | |
3af73b28 | 4440 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4441 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4442 | if (ret < 0) |
4443 | req_set_fail_links(req); | |
3af73b28 PB |
4444 | fput(close->put_file); |
4445 | close->put_file = NULL; | |
229a7b63 | 4446 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4447 | return 0; |
b5dba59e JA |
4448 | } |
4449 | ||
3529d8c2 | 4450 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4451 | { |
4452 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4453 | |
4454 | if (!req->file) | |
4455 | return -EBADF; | |
5d17b4a4 JA |
4456 | |
4457 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4458 | return -EINVAL; | |
4459 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4460 | return -EINVAL; | |
4461 | ||
8ed8d3c3 JA |
4462 | req->sync.off = READ_ONCE(sqe->off); |
4463 | req->sync.len = READ_ONCE(sqe->len); | |
4464 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4465 | return 0; |
4466 | } | |
4467 | ||
ac45abc0 | 4468 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4469 | { |
8ed8d3c3 JA |
4470 | int ret; |
4471 | ||
ac45abc0 PB |
4472 | /* sync_file_range always requires a blocking context */ |
4473 | if (force_nonblock) | |
4474 | return -EAGAIN; | |
4475 | ||
9adbd45d | 4476 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4477 | req->sync.flags); |
4478 | if (ret < 0) | |
4479 | req_set_fail_links(req); | |
e1e16097 | 4480 | io_req_complete(req, ret); |
5d17b4a4 JA |
4481 | return 0; |
4482 | } | |
4483 | ||
469956e8 | 4484 | #if defined(CONFIG_NET) |
02d27d89 PB |
4485 | static int io_setup_async_msg(struct io_kiocb *req, |
4486 | struct io_async_msghdr *kmsg) | |
4487 | { | |
e8c2bc1f JA |
4488 | struct io_async_msghdr *async_msg = req->async_data; |
4489 | ||
4490 | if (async_msg) | |
02d27d89 | 4491 | return -EAGAIN; |
e8c2bc1f | 4492 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4493 | if (kmsg->iov != kmsg->fast_iov) |
4494 | kfree(kmsg->iov); | |
4495 | return -ENOMEM; | |
4496 | } | |
e8c2bc1f | 4497 | async_msg = req->async_data; |
02d27d89 | 4498 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4499 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4500 | return -EAGAIN; |
4501 | } | |
4502 | ||
2ae523ed PB |
4503 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4504 | struct io_async_msghdr *iomsg) | |
4505 | { | |
4506 | iomsg->iov = iomsg->fast_iov; | |
4507 | iomsg->msg.msg_name = &iomsg->addr; | |
4508 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4509 | req->sr_msg.msg_flags, &iomsg->iov); | |
4510 | } | |
4511 | ||
3529d8c2 | 4512 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4513 | { |
e8c2bc1f | 4514 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4515 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4516 | int ret; |
03b1230c | 4517 | |
d2b6f48b PB |
4518 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4519 | return -EINVAL; | |
4520 | ||
e47293fd | 4521 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4522 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4523 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4524 | |
d8768362 JA |
4525 | #ifdef CONFIG_COMPAT |
4526 | if (req->ctx->compat) | |
4527 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4528 | #endif | |
4529 | ||
e8c2bc1f | 4530 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4531 | return 0; |
e8c2bc1f | 4532 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4533 | if (!ret) |
4534 | req->flags |= REQ_F_NEED_CLEANUP; | |
4535 | return ret; | |
03b1230c JA |
4536 | } |
4537 | ||
229a7b63 JA |
4538 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4539 | struct io_comp_state *cs) | |
aa1fa28f | 4540 | { |
6b754c8b | 4541 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4542 | struct socket *sock; |
7a7cacba | 4543 | unsigned flags; |
0fa03c62 JA |
4544 | int ret; |
4545 | ||
0fa03c62 | 4546 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4547 | if (unlikely(!sock)) |
4548 | return ret; | |
3529d8c2 | 4549 | |
e8c2bc1f JA |
4550 | if (req->async_data) { |
4551 | kmsg = req->async_data; | |
4552 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4553 | /* if iov is set, it's allocated already */ |
4554 | if (!kmsg->iov) | |
4555 | kmsg->iov = kmsg->fast_iov; | |
4556 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4557 | } else { | |
4558 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4559 | if (ret) | |
4560 | return ret; | |
4561 | kmsg = &iomsg; | |
0fa03c62 | 4562 | } |
0fa03c62 | 4563 | |
7a7cacba PB |
4564 | flags = req->sr_msg.msg_flags; |
4565 | if (flags & MSG_DONTWAIT) | |
4566 | req->flags |= REQ_F_NOWAIT; | |
4567 | else if (force_nonblock) | |
4568 | flags |= MSG_DONTWAIT; | |
e47293fd | 4569 | |
7a7cacba PB |
4570 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4571 | if (force_nonblock && ret == -EAGAIN) | |
4572 | return io_setup_async_msg(req, kmsg); | |
4573 | if (ret == -ERESTARTSYS) | |
4574 | ret = -EINTR; | |
0fa03c62 | 4575 | |
6b754c8b | 4576 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4577 | kfree(kmsg->iov); |
99bc4c38 | 4578 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4579 | if (ret < 0) |
4580 | req_set_fail_links(req); | |
229a7b63 | 4581 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4582 | return 0; |
03b1230c | 4583 | } |
aa1fa28f | 4584 | |
229a7b63 JA |
4585 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4586 | struct io_comp_state *cs) | |
fddaface | 4587 | { |
7a7cacba PB |
4588 | struct io_sr_msg *sr = &req->sr_msg; |
4589 | struct msghdr msg; | |
4590 | struct iovec iov; | |
fddaface | 4591 | struct socket *sock; |
7a7cacba | 4592 | unsigned flags; |
fddaface JA |
4593 | int ret; |
4594 | ||
fddaface | 4595 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4596 | if (unlikely(!sock)) |
4597 | return ret; | |
fddaface | 4598 | |
7a7cacba PB |
4599 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4600 | if (unlikely(ret)) | |
14db8411 | 4601 | return ret; |
fddaface | 4602 | |
7a7cacba PB |
4603 | msg.msg_name = NULL; |
4604 | msg.msg_control = NULL; | |
4605 | msg.msg_controllen = 0; | |
4606 | msg.msg_namelen = 0; | |
fddaface | 4607 | |
7a7cacba PB |
4608 | flags = req->sr_msg.msg_flags; |
4609 | if (flags & MSG_DONTWAIT) | |
4610 | req->flags |= REQ_F_NOWAIT; | |
4611 | else if (force_nonblock) | |
4612 | flags |= MSG_DONTWAIT; | |
fddaface | 4613 | |
7a7cacba PB |
4614 | msg.msg_flags = flags; |
4615 | ret = sock_sendmsg(sock, &msg); | |
4616 | if (force_nonblock && ret == -EAGAIN) | |
4617 | return -EAGAIN; | |
4618 | if (ret == -ERESTARTSYS) | |
4619 | ret = -EINTR; | |
fddaface | 4620 | |
fddaface JA |
4621 | if (ret < 0) |
4622 | req_set_fail_links(req); | |
229a7b63 | 4623 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4624 | return 0; |
fddaface JA |
4625 | } |
4626 | ||
1400e697 PB |
4627 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4628 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4629 | { |
4630 | struct io_sr_msg *sr = &req->sr_msg; | |
4631 | struct iovec __user *uiov; | |
4632 | size_t iov_len; | |
4633 | int ret; | |
4634 | ||
1400e697 PB |
4635 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4636 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4637 | if (ret) |
4638 | return ret; | |
4639 | ||
4640 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4641 | if (iov_len > 1) | |
4642 | return -EINVAL; | |
1400e697 | 4643 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4644 | return -EFAULT; |
1400e697 PB |
4645 | sr->len = iomsg->iov[0].iov_len; |
4646 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4647 | sr->len); |
1400e697 | 4648 | iomsg->iov = NULL; |
52de1fe1 | 4649 | } else { |
89cd35c5 CH |
4650 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4651 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4652 | false); | |
52de1fe1 JA |
4653 | if (ret > 0) |
4654 | ret = 0; | |
4655 | } | |
4656 | ||
4657 | return ret; | |
4658 | } | |
4659 | ||
4660 | #ifdef CONFIG_COMPAT | |
4661 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4662 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4663 | { |
4664 | struct compat_msghdr __user *msg_compat; | |
4665 | struct io_sr_msg *sr = &req->sr_msg; | |
4666 | struct compat_iovec __user *uiov; | |
4667 | compat_uptr_t ptr; | |
4668 | compat_size_t len; | |
4669 | int ret; | |
4670 | ||
270a5940 | 4671 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4672 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4673 | &ptr, &len); |
4674 | if (ret) | |
4675 | return ret; | |
4676 | ||
4677 | uiov = compat_ptr(ptr); | |
4678 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4679 | compat_ssize_t clen; | |
4680 | ||
4681 | if (len > 1) | |
4682 | return -EINVAL; | |
4683 | if (!access_ok(uiov, sizeof(*uiov))) | |
4684 | return -EFAULT; | |
4685 | if (__get_user(clen, &uiov->iov_len)) | |
4686 | return -EFAULT; | |
4687 | if (clen < 0) | |
4688 | return -EINVAL; | |
1400e697 PB |
4689 | sr->len = iomsg->iov[0].iov_len; |
4690 | iomsg->iov = NULL; | |
52de1fe1 | 4691 | } else { |
89cd35c5 CH |
4692 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4693 | UIO_FASTIOV, &iomsg->iov, | |
4694 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4695 | if (ret < 0) |
4696 | return ret; | |
4697 | } | |
4698 | ||
4699 | return 0; | |
4700 | } | |
4701 | #endif | |
4702 | ||
1400e697 PB |
4703 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4704 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4705 | { |
1400e697 PB |
4706 | iomsg->msg.msg_name = &iomsg->addr; |
4707 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4708 | |
4709 | #ifdef CONFIG_COMPAT | |
4710 | if (req->ctx->compat) | |
1400e697 | 4711 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4712 | #endif |
52de1fe1 | 4713 | |
1400e697 | 4714 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4715 | } |
4716 | ||
bcda7baa | 4717 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4718 | bool needs_lock) |
bcda7baa JA |
4719 | { |
4720 | struct io_sr_msg *sr = &req->sr_msg; | |
4721 | struct io_buffer *kbuf; | |
4722 | ||
bcda7baa JA |
4723 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4724 | if (IS_ERR(kbuf)) | |
4725 | return kbuf; | |
4726 | ||
4727 | sr->kbuf = kbuf; | |
4728 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4729 | return kbuf; |
fddaface JA |
4730 | } |
4731 | ||
7fbb1b54 PB |
4732 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4733 | { | |
4734 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4735 | } | |
4736 | ||
3529d8c2 JA |
4737 | static int io_recvmsg_prep(struct io_kiocb *req, |
4738 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4739 | { |
e8c2bc1f | 4740 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4741 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4742 | int ret; |
3529d8c2 | 4743 | |
d2b6f48b PB |
4744 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4745 | return -EINVAL; | |
4746 | ||
3529d8c2 | 4747 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4748 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4749 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4750 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4751 | |
d8768362 JA |
4752 | #ifdef CONFIG_COMPAT |
4753 | if (req->ctx->compat) | |
4754 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4755 | #endif | |
4756 | ||
e8c2bc1f | 4757 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4758 | return 0; |
e8c2bc1f | 4759 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4760 | if (!ret) |
4761 | req->flags |= REQ_F_NEED_CLEANUP; | |
4762 | return ret; | |
aa1fa28f JA |
4763 | } |
4764 | ||
229a7b63 JA |
4765 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4766 | struct io_comp_state *cs) | |
aa1fa28f | 4767 | { |
6b754c8b | 4768 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4769 | struct socket *sock; |
7fbb1b54 | 4770 | struct io_buffer *kbuf; |
7a7cacba | 4771 | unsigned flags; |
52de1fe1 | 4772 | int ret, cflags = 0; |
03b1230c | 4773 | |
03b1230c | 4774 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4775 | if (unlikely(!sock)) |
4776 | return ret; | |
3529d8c2 | 4777 | |
e8c2bc1f JA |
4778 | if (req->async_data) { |
4779 | kmsg = req->async_data; | |
4780 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4781 | /* if iov is set, it's allocated already */ |
4782 | if (!kmsg->iov) | |
4783 | kmsg->iov = kmsg->fast_iov; | |
4784 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4785 | } else { | |
4786 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4787 | if (ret) | |
681fda8d | 4788 | return ret; |
7a7cacba PB |
4789 | kmsg = &iomsg; |
4790 | } | |
03b1230c | 4791 | |
bc02ef33 | 4792 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4793 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4794 | if (IS_ERR(kbuf)) |
52de1fe1 | 4795 | return PTR_ERR(kbuf); |
7a7cacba PB |
4796 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4797 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4798 | 1, req->sr_msg.len); | |
4799 | } | |
52de1fe1 | 4800 | |
7a7cacba PB |
4801 | flags = req->sr_msg.msg_flags; |
4802 | if (flags & MSG_DONTWAIT) | |
4803 | req->flags |= REQ_F_NOWAIT; | |
4804 | else if (force_nonblock) | |
4805 | flags |= MSG_DONTWAIT; | |
e47293fd | 4806 | |
7a7cacba PB |
4807 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4808 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4809 | if (force_nonblock && ret == -EAGAIN) |
4810 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4811 | if (ret == -ERESTARTSYS) |
4812 | ret = -EINTR; | |
03b1230c | 4813 | |
7fbb1b54 PB |
4814 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4815 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4816 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4817 | kfree(kmsg->iov); |
99bc4c38 | 4818 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4819 | if (ret < 0) |
4820 | req_set_fail_links(req); | |
229a7b63 | 4821 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4822 | return 0; |
0fa03c62 | 4823 | } |
5d17b4a4 | 4824 | |
229a7b63 JA |
4825 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4826 | struct io_comp_state *cs) | |
fddaface | 4827 | { |
6b754c8b | 4828 | struct io_buffer *kbuf; |
7a7cacba PB |
4829 | struct io_sr_msg *sr = &req->sr_msg; |
4830 | struct msghdr msg; | |
4831 | void __user *buf = sr->buf; | |
fddaface | 4832 | struct socket *sock; |
7a7cacba PB |
4833 | struct iovec iov; |
4834 | unsigned flags; | |
bcda7baa | 4835 | int ret, cflags = 0; |
fddaface | 4836 | |
fddaface | 4837 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4838 | if (unlikely(!sock)) |
4839 | return ret; | |
fddaface | 4840 | |
bc02ef33 | 4841 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4842 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4843 | if (IS_ERR(kbuf)) |
4844 | return PTR_ERR(kbuf); | |
7a7cacba | 4845 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4846 | } |
bcda7baa | 4847 | |
7a7cacba | 4848 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4849 | if (unlikely(ret)) |
4850 | goto out_free; | |
fddaface | 4851 | |
7a7cacba PB |
4852 | msg.msg_name = NULL; |
4853 | msg.msg_control = NULL; | |
4854 | msg.msg_controllen = 0; | |
4855 | msg.msg_namelen = 0; | |
4856 | msg.msg_iocb = NULL; | |
4857 | msg.msg_flags = 0; | |
fddaface | 4858 | |
7a7cacba PB |
4859 | flags = req->sr_msg.msg_flags; |
4860 | if (flags & MSG_DONTWAIT) | |
4861 | req->flags |= REQ_F_NOWAIT; | |
4862 | else if (force_nonblock) | |
4863 | flags |= MSG_DONTWAIT; | |
4864 | ||
4865 | ret = sock_recvmsg(sock, &msg, flags); | |
4866 | if (force_nonblock && ret == -EAGAIN) | |
4867 | return -EAGAIN; | |
4868 | if (ret == -ERESTARTSYS) | |
4869 | ret = -EINTR; | |
14c32eee | 4870 | out_free: |
7fbb1b54 PB |
4871 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4872 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4873 | if (ret < 0) |
4874 | req_set_fail_links(req); | |
229a7b63 | 4875 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4876 | return 0; |
fddaface JA |
4877 | } |
4878 | ||
3529d8c2 | 4879 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4880 | { |
8ed8d3c3 JA |
4881 | struct io_accept *accept = &req->accept; |
4882 | ||
14587a46 | 4883 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4884 | return -EINVAL; |
8042d6ce | 4885 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4886 | return -EINVAL; |
4887 | ||
d55e5f5b JA |
4888 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4889 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4890 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4891 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4892 | return 0; |
8ed8d3c3 | 4893 | } |
17f2fe35 | 4894 | |
229a7b63 JA |
4895 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4896 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4897 | { |
4898 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4899 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4900 | int ret; |
4901 | ||
e697deed JX |
4902 | if (req->file->f_flags & O_NONBLOCK) |
4903 | req->flags |= REQ_F_NOWAIT; | |
4904 | ||
8ed8d3c3 | 4905 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4906 | accept->addr_len, accept->flags, |
4907 | accept->nofile); | |
8ed8d3c3 | 4908 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4909 | return -EAGAIN; |
ac45abc0 PB |
4910 | if (ret < 0) { |
4911 | if (ret == -ERESTARTSYS) | |
4912 | ret = -EINTR; | |
4e88d6e7 | 4913 | req_set_fail_links(req); |
ac45abc0 | 4914 | } |
229a7b63 | 4915 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4916 | return 0; |
8ed8d3c3 JA |
4917 | } |
4918 | ||
3529d8c2 | 4919 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4920 | { |
3529d8c2 | 4921 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4922 | struct io_async_connect *io = req->async_data; |
f499a021 | 4923 | |
14587a46 | 4924 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4925 | return -EINVAL; |
4926 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4927 | return -EINVAL; | |
4928 | ||
3529d8c2 JA |
4929 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4930 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4931 | ||
4932 | if (!io) | |
4933 | return 0; | |
4934 | ||
4935 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4936 | &io->address); |
f499a021 JA |
4937 | } |
4938 | ||
229a7b63 JA |
4939 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4940 | struct io_comp_state *cs) | |
f8e85cf2 | 4941 | { |
e8c2bc1f | 4942 | struct io_async_connect __io, *io; |
f8e85cf2 | 4943 | unsigned file_flags; |
3fbb51c1 | 4944 | int ret; |
f8e85cf2 | 4945 | |
e8c2bc1f JA |
4946 | if (req->async_data) { |
4947 | io = req->async_data; | |
f499a021 | 4948 | } else { |
3529d8c2 JA |
4949 | ret = move_addr_to_kernel(req->connect.addr, |
4950 | req->connect.addr_len, | |
e8c2bc1f | 4951 | &__io.address); |
f499a021 JA |
4952 | if (ret) |
4953 | goto out; | |
4954 | io = &__io; | |
4955 | } | |
4956 | ||
3fbb51c1 JA |
4957 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4958 | ||
e8c2bc1f | 4959 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4960 | req->connect.addr_len, file_flags); |
87f80d62 | 4961 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4962 | if (req->async_data) |
b7bb4f7d | 4963 | return -EAGAIN; |
e8c2bc1f | 4964 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4965 | ret = -ENOMEM; |
4966 | goto out; | |
4967 | } | |
e8c2bc1f JA |
4968 | io = req->async_data; |
4969 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4970 | return -EAGAIN; |
f499a021 | 4971 | } |
f8e85cf2 JA |
4972 | if (ret == -ERESTARTSYS) |
4973 | ret = -EINTR; | |
f499a021 | 4974 | out: |
4e88d6e7 JA |
4975 | if (ret < 0) |
4976 | req_set_fail_links(req); | |
229a7b63 | 4977 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4978 | return 0; |
469956e8 Y |
4979 | } |
4980 | #else /* !CONFIG_NET */ | |
4981 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4982 | { | |
f8e85cf2 | 4983 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4984 | } |
4985 | ||
1e16c2f9 RD |
4986 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4987 | struct io_comp_state *cs) | |
469956e8 Y |
4988 | { |
4989 | return -EOPNOTSUPP; | |
4990 | } | |
4991 | ||
1e16c2f9 RD |
4992 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4993 | struct io_comp_state *cs) | |
469956e8 Y |
4994 | { |
4995 | return -EOPNOTSUPP; | |
4996 | } | |
4997 | ||
4998 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4999 | const struct io_uring_sqe *sqe) | |
5000 | { | |
5001 | return -EOPNOTSUPP; | |
5002 | } | |
5003 | ||
1e16c2f9 RD |
5004 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
5005 | struct io_comp_state *cs) | |
469956e8 Y |
5006 | { |
5007 | return -EOPNOTSUPP; | |
5008 | } | |
5009 | ||
1e16c2f9 RD |
5010 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
5011 | struct io_comp_state *cs) | |
469956e8 Y |
5012 | { |
5013 | return -EOPNOTSUPP; | |
5014 | } | |
5015 | ||
5016 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5017 | { | |
5018 | return -EOPNOTSUPP; | |
5019 | } | |
5020 | ||
1e16c2f9 RD |
5021 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
5022 | struct io_comp_state *cs) | |
469956e8 Y |
5023 | { |
5024 | return -EOPNOTSUPP; | |
5025 | } | |
ce593a6c | 5026 | |
469956e8 Y |
5027 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5028 | { | |
5029 | return -EOPNOTSUPP; | |
5030 | } | |
5031 | ||
1e16c2f9 RD |
5032 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5033 | struct io_comp_state *cs) | |
469956e8 | 5034 | { |
f8e85cf2 | 5035 | return -EOPNOTSUPP; |
ce593a6c | 5036 | } |
469956e8 | 5037 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5038 | |
d7718a9d JA |
5039 | struct io_poll_table { |
5040 | struct poll_table_struct pt; | |
5041 | struct io_kiocb *req; | |
5042 | int error; | |
5043 | }; | |
ce593a6c | 5044 | |
d7718a9d JA |
5045 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5046 | __poll_t mask, task_work_func_t func) | |
5047 | { | |
fd7d6de2 | 5048 | bool twa_signal_ok; |
aa96bf8a | 5049 | int ret; |
d7718a9d JA |
5050 | |
5051 | /* for instances that support it check for an event match first: */ | |
5052 | if (mask && !(mask & poll->events)) | |
5053 | return 0; | |
5054 | ||
5055 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5056 | ||
5057 | list_del_init(&poll->wait.entry); | |
5058 | ||
d7718a9d JA |
5059 | req->result = mask; |
5060 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5061 | percpu_ref_get(&req->ctx->refs); |
5062 | ||
fd7d6de2 JA |
5063 | /* |
5064 | * If we using the signalfd wait_queue_head for this wakeup, then | |
5065 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
5066 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
5067 | * either, as the normal wakeup will suffice. | |
5068 | */ | |
5069 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
5070 | ||
d7718a9d | 5071 | /* |
e3aabf95 JA |
5072 | * If this fails, then the task is exiting. When a task exits, the |
5073 | * work gets canceled, so just cancel this request as well instead | |
5074 | * of executing it. We can't safely execute it anyway, as we may not | |
5075 | * have the needed state needed for it anyway. | |
d7718a9d | 5076 | */ |
87c4311f | 5077 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 5078 | if (unlikely(ret)) { |
c2c4c83c JA |
5079 | struct task_struct *tsk; |
5080 | ||
e3aabf95 | 5081 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5082 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5083 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5084 | wake_up_process(tsk); |
aa96bf8a | 5085 | } |
d7718a9d JA |
5086 | return 1; |
5087 | } | |
5088 | ||
74ce6ce4 JA |
5089 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5090 | __acquires(&req->ctx->completion_lock) | |
5091 | { | |
5092 | struct io_ring_ctx *ctx = req->ctx; | |
5093 | ||
5094 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5095 | struct poll_table_struct pt = { ._key = poll->events }; | |
5096 | ||
5097 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5098 | } | |
5099 | ||
5100 | spin_lock_irq(&ctx->completion_lock); | |
5101 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5102 | add_wait_queue(poll->head, &poll->wait); | |
5103 | return true; | |
5104 | } | |
5105 | ||
5106 | return false; | |
5107 | } | |
5108 | ||
d4e7cd36 | 5109 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5110 | { |
e8c2bc1f | 5111 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5112 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5113 | return req->async_data; |
d4e7cd36 JA |
5114 | return req->apoll->double_poll; |
5115 | } | |
5116 | ||
5117 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5118 | { | |
5119 | if (req->opcode == IORING_OP_POLL_ADD) | |
5120 | return &req->poll; | |
5121 | return &req->apoll->poll; | |
5122 | } | |
5123 | ||
5124 | static void io_poll_remove_double(struct io_kiocb *req) | |
5125 | { | |
5126 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5127 | |
5128 | lockdep_assert_held(&req->ctx->completion_lock); | |
5129 | ||
5130 | if (poll && poll->head) { | |
5131 | struct wait_queue_head *head = poll->head; | |
5132 | ||
5133 | spin_lock(&head->lock); | |
5134 | list_del_init(&poll->wait.entry); | |
5135 | if (poll->wait.private) | |
5136 | refcount_dec(&req->refs); | |
5137 | poll->head = NULL; | |
5138 | spin_unlock(&head->lock); | |
5139 | } | |
5140 | } | |
5141 | ||
5142 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5143 | { | |
5144 | struct io_ring_ctx *ctx = req->ctx; | |
5145 | ||
d4e7cd36 | 5146 | io_poll_remove_double(req); |
18bceab1 JA |
5147 | req->poll.done = true; |
5148 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5149 | io_commit_cqring(ctx); | |
5150 | } | |
5151 | ||
dd221f46 | 5152 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5153 | { |
dd221f46 | 5154 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5155 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5156 | struct io_kiocb *nxt; |
18bceab1 JA |
5157 | |
5158 | if (io_poll_rewait(req, &req->poll)) { | |
5159 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5160 | } else { |
5161 | hash_del(&req->hash_node); | |
5162 | io_poll_complete(req, req->result, 0); | |
5163 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5164 | |
dd221f46 PB |
5165 | nxt = io_put_req_find_next(req); |
5166 | io_cqring_ev_posted(ctx); | |
5167 | if (nxt) | |
5168 | __io_req_task_submit(nxt); | |
5169 | } | |
18bceab1 | 5170 | |
6d816e08 | 5171 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5172 | } |
5173 | ||
5174 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5175 | int sync, void *key) | |
5176 | { | |
5177 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5178 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5179 | __poll_t mask = key_to_poll(key); |
5180 | ||
5181 | /* for instances that support it check for an event match first: */ | |
5182 | if (mask && !(mask & poll->events)) | |
5183 | return 0; | |
5184 | ||
8706e04e JA |
5185 | list_del_init(&wait->entry); |
5186 | ||
807abcb0 | 5187 | if (poll && poll->head) { |
18bceab1 JA |
5188 | bool done; |
5189 | ||
807abcb0 JA |
5190 | spin_lock(&poll->head->lock); |
5191 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5192 | if (!done) |
807abcb0 | 5193 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5194 | /* make sure double remove sees this as being gone */ |
5195 | wait->private = NULL; | |
807abcb0 | 5196 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5197 | if (!done) { |
5198 | /* use wait func handler, so it matches the rq type */ | |
5199 | poll->wait.func(&poll->wait, mode, sync, key); | |
5200 | } | |
18bceab1 JA |
5201 | } |
5202 | refcount_dec(&req->refs); | |
5203 | return 1; | |
5204 | } | |
5205 | ||
5206 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5207 | wait_queue_func_t wake_func) | |
5208 | { | |
5209 | poll->head = NULL; | |
5210 | poll->done = false; | |
5211 | poll->canceled = false; | |
5212 | poll->events = events; | |
5213 | INIT_LIST_HEAD(&poll->wait.entry); | |
5214 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5215 | } | |
5216 | ||
5217 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5218 | struct wait_queue_head *head, |
5219 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5220 | { |
5221 | struct io_kiocb *req = pt->req; | |
5222 | ||
5223 | /* | |
5224 | * If poll->head is already set, it's because the file being polled | |
5225 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5226 | * for write). Setup a separate io_poll_iocb if this happens. | |
5227 | */ | |
5228 | if (unlikely(poll->head)) { | |
58852d4d PB |
5229 | struct io_poll_iocb *poll_one = poll; |
5230 | ||
18bceab1 | 5231 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5232 | if (*poll_ptr) { |
18bceab1 JA |
5233 | pt->error = -EINVAL; |
5234 | return; | |
5235 | } | |
5236 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5237 | if (!poll) { | |
5238 | pt->error = -ENOMEM; | |
5239 | return; | |
5240 | } | |
58852d4d | 5241 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5242 | refcount_inc(&req->refs); |
5243 | poll->wait.private = req; | |
807abcb0 | 5244 | *poll_ptr = poll; |
18bceab1 JA |
5245 | } |
5246 | ||
5247 | pt->error = 0; | |
5248 | poll->head = head; | |
a31eb4a2 JX |
5249 | |
5250 | if (poll->events & EPOLLEXCLUSIVE) | |
5251 | add_wait_queue_exclusive(head, &poll->wait); | |
5252 | else | |
5253 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5254 | } |
5255 | ||
5256 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5257 | struct poll_table_struct *p) | |
5258 | { | |
5259 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5260 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5261 | |
807abcb0 | 5262 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5263 | } |
5264 | ||
d7718a9d JA |
5265 | static void io_async_task_func(struct callback_head *cb) |
5266 | { | |
5267 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5268 | struct async_poll *apoll = req->apoll; | |
5269 | struct io_ring_ctx *ctx = req->ctx; | |
5270 | ||
5271 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5272 | ||
74ce6ce4 | 5273 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5274 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5275 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5276 | return; |
d7718a9d JA |
5277 | } |
5278 | ||
31067255 | 5279 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5280 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5281 | hash_del(&req->hash_node); |
2bae047e | 5282 | |
d4e7cd36 | 5283 | io_poll_remove_double(req); |
74ce6ce4 JA |
5284 | spin_unlock_irq(&ctx->completion_lock); |
5285 | ||
0be0b0e3 PB |
5286 | if (!READ_ONCE(apoll->poll.canceled)) |
5287 | __io_req_task_submit(req); | |
5288 | else | |
5289 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5290 | |
6d816e08 | 5291 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5292 | kfree(apoll->double_poll); |
31067255 | 5293 | kfree(apoll); |
d7718a9d JA |
5294 | } |
5295 | ||
5296 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5297 | void *key) | |
5298 | { | |
5299 | struct io_kiocb *req = wait->private; | |
5300 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5301 | ||
5302 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5303 | key_to_poll(key)); | |
5304 | ||
5305 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5306 | } | |
5307 | ||
5308 | static void io_poll_req_insert(struct io_kiocb *req) | |
5309 | { | |
5310 | struct io_ring_ctx *ctx = req->ctx; | |
5311 | struct hlist_head *list; | |
5312 | ||
5313 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5314 | hlist_add_head(&req->hash_node, list); | |
5315 | } | |
5316 | ||
5317 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5318 | struct io_poll_iocb *poll, | |
5319 | struct io_poll_table *ipt, __poll_t mask, | |
5320 | wait_queue_func_t wake_func) | |
5321 | __acquires(&ctx->completion_lock) | |
5322 | { | |
5323 | struct io_ring_ctx *ctx = req->ctx; | |
5324 | bool cancel = false; | |
5325 | ||
4d52f338 | 5326 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5327 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5328 | poll->file = req->file; |
18bceab1 | 5329 | poll->wait.private = req; |
d7718a9d JA |
5330 | |
5331 | ipt->pt._key = mask; | |
5332 | ipt->req = req; | |
5333 | ipt->error = -EINVAL; | |
5334 | ||
d7718a9d JA |
5335 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5336 | ||
5337 | spin_lock_irq(&ctx->completion_lock); | |
5338 | if (likely(poll->head)) { | |
5339 | spin_lock(&poll->head->lock); | |
5340 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5341 | if (ipt->error) | |
5342 | cancel = true; | |
5343 | ipt->error = 0; | |
5344 | mask = 0; | |
5345 | } | |
5346 | if (mask || ipt->error) | |
5347 | list_del_init(&poll->wait.entry); | |
5348 | else if (cancel) | |
5349 | WRITE_ONCE(poll->canceled, true); | |
5350 | else if (!poll->done) /* actually waiting for an event */ | |
5351 | io_poll_req_insert(req); | |
5352 | spin_unlock(&poll->head->lock); | |
5353 | } | |
5354 | ||
5355 | return mask; | |
5356 | } | |
5357 | ||
5358 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5359 | { | |
5360 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5361 | struct io_ring_ctx *ctx = req->ctx; | |
5362 | struct async_poll *apoll; | |
5363 | struct io_poll_table ipt; | |
5364 | __poll_t mask, ret; | |
9dab14b8 | 5365 | int rw; |
d7718a9d JA |
5366 | |
5367 | if (!req->file || !file_can_poll(req->file)) | |
5368 | return false; | |
24c74678 | 5369 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5370 | return false; |
9dab14b8 JA |
5371 | if (def->pollin) |
5372 | rw = READ; | |
5373 | else if (def->pollout) | |
5374 | rw = WRITE; | |
5375 | else | |
5376 | return false; | |
5377 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5378 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5379 | return false; |
5380 | ||
5381 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5382 | if (unlikely(!apoll)) | |
5383 | return false; | |
807abcb0 | 5384 | apoll->double_poll = NULL; |
d7718a9d JA |
5385 | |
5386 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5387 | req->apoll = apoll; |
d7718a9d | 5388 | |
8755d97a | 5389 | mask = 0; |
d7718a9d | 5390 | if (def->pollin) |
8755d97a | 5391 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5392 | if (def->pollout) |
5393 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5394 | |
5395 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5396 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5397 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5398 | mask &= ~POLLIN; | |
5399 | ||
d7718a9d JA |
5400 | mask |= POLLERR | POLLPRI; |
5401 | ||
5402 | ipt.pt._qproc = io_async_queue_proc; | |
5403 | ||
5404 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5405 | io_async_wake); | |
a36da65c | 5406 | if (ret || ipt.error) { |
d4e7cd36 | 5407 | io_poll_remove_double(req); |
d7718a9d | 5408 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5409 | kfree(apoll->double_poll); |
d7718a9d JA |
5410 | kfree(apoll); |
5411 | return false; | |
5412 | } | |
5413 | spin_unlock_irq(&ctx->completion_lock); | |
5414 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5415 | apoll->poll.events); | |
5416 | return true; | |
5417 | } | |
5418 | ||
5419 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5420 | struct io_poll_iocb *poll) | |
221c5eb2 | 5421 | { |
b41e9852 | 5422 | bool do_complete = false; |
221c5eb2 JA |
5423 | |
5424 | spin_lock(&poll->head->lock); | |
5425 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5426 | if (!list_empty(&poll->wait.entry)) { |
5427 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5428 | do_complete = true; |
221c5eb2 JA |
5429 | } |
5430 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5431 | hash_del(&req->hash_node); |
d7718a9d JA |
5432 | return do_complete; |
5433 | } | |
5434 | ||
5435 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5436 | { | |
5437 | bool do_complete; | |
5438 | ||
d4e7cd36 JA |
5439 | io_poll_remove_double(req); |
5440 | ||
d7718a9d JA |
5441 | if (req->opcode == IORING_OP_POLL_ADD) { |
5442 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5443 | } else { | |
3bfa5bcb JA |
5444 | struct async_poll *apoll = req->apoll; |
5445 | ||
d7718a9d | 5446 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5447 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5448 | if (do_complete) { | |
d7718a9d | 5449 | io_put_req(req); |
807abcb0 | 5450 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5451 | kfree(apoll); |
5452 | } | |
b1f573bd XW |
5453 | } |
5454 | ||
b41e9852 JA |
5455 | if (do_complete) { |
5456 | io_cqring_fill_event(req, -ECANCELED); | |
5457 | io_commit_cqring(req->ctx); | |
f254ac04 | 5458 | req_set_fail_links(req); |
216578e5 | 5459 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5460 | } |
5461 | ||
5462 | return do_complete; | |
221c5eb2 JA |
5463 | } |
5464 | ||
76e1b642 JA |
5465 | /* |
5466 | * Returns true if we found and killed one or more poll requests | |
5467 | */ | |
6b81928d PB |
5468 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5469 | struct files_struct *files) | |
221c5eb2 | 5470 | { |
78076bb6 | 5471 | struct hlist_node *tmp; |
221c5eb2 | 5472 | struct io_kiocb *req; |
8e2e1faf | 5473 | int posted = 0, i; |
221c5eb2 JA |
5474 | |
5475 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5476 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5477 | struct hlist_head *list; | |
5478 | ||
5479 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5480 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5481 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5482 | posted += io_poll_remove_one(req); |
5483 | } | |
221c5eb2 JA |
5484 | } |
5485 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5486 | |
8e2e1faf JA |
5487 | if (posted) |
5488 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5489 | |
5490 | return posted != 0; | |
221c5eb2 JA |
5491 | } |
5492 | ||
47f46768 JA |
5493 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5494 | { | |
78076bb6 | 5495 | struct hlist_head *list; |
47f46768 JA |
5496 | struct io_kiocb *req; |
5497 | ||
78076bb6 JA |
5498 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5499 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5500 | if (sqe_addr != req->user_data) |
5501 | continue; | |
5502 | if (io_poll_remove_one(req)) | |
eac406c6 | 5503 | return 0; |
b41e9852 | 5504 | return -EALREADY; |
47f46768 JA |
5505 | } |
5506 | ||
5507 | return -ENOENT; | |
5508 | } | |
5509 | ||
3529d8c2 JA |
5510 | static int io_poll_remove_prep(struct io_kiocb *req, |
5511 | const struct io_uring_sqe *sqe) | |
0969e783 | 5512 | { |
0969e783 JA |
5513 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5514 | return -EINVAL; | |
5515 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5516 | sqe->poll_events) | |
5517 | return -EINVAL; | |
5518 | ||
018043be | 5519 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5520 | return 0; |
5521 | } | |
5522 | ||
221c5eb2 JA |
5523 | /* |
5524 | * Find a running poll command that matches one specified in sqe->addr, | |
5525 | * and remove it if found. | |
5526 | */ | |
fc4df999 | 5527 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5528 | { |
5529 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5530 | int ret; |
221c5eb2 | 5531 | |
221c5eb2 | 5532 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5533 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5534 | spin_unlock_irq(&ctx->completion_lock); |
5535 | ||
4e88d6e7 JA |
5536 | if (ret < 0) |
5537 | req_set_fail_links(req); | |
e1e16097 | 5538 | io_req_complete(req, ret); |
221c5eb2 JA |
5539 | return 0; |
5540 | } | |
5541 | ||
221c5eb2 JA |
5542 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5543 | void *key) | |
5544 | { | |
c2f2eb7d JA |
5545 | struct io_kiocb *req = wait->private; |
5546 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5547 | |
d7718a9d | 5548 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5549 | } |
5550 | ||
221c5eb2 JA |
5551 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5552 | struct poll_table_struct *p) | |
5553 | { | |
5554 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5555 | ||
e8c2bc1f | 5556 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5557 | } |
5558 | ||
3529d8c2 | 5559 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5560 | { |
5561 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5562 | u32 events; |
221c5eb2 JA |
5563 | |
5564 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5565 | return -EINVAL; | |
5566 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5567 | return -EINVAL; | |
5568 | ||
5769a351 JX |
5569 | events = READ_ONCE(sqe->poll32_events); |
5570 | #ifdef __BIG_ENDIAN | |
5571 | events = swahw32(events); | |
5572 | #endif | |
a31eb4a2 JX |
5573 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5574 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5575 | return 0; |
5576 | } | |
5577 | ||
014db007 | 5578 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5579 | { |
5580 | struct io_poll_iocb *poll = &req->poll; | |
5581 | struct io_ring_ctx *ctx = req->ctx; | |
5582 | struct io_poll_table ipt; | |
0969e783 | 5583 | __poll_t mask; |
0969e783 | 5584 | |
d7718a9d | 5585 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5586 | |
d7718a9d JA |
5587 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5588 | io_poll_wake); | |
221c5eb2 | 5589 | |
8c838788 | 5590 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5591 | ipt.error = 0; |
b0dd8a41 | 5592 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5593 | } |
221c5eb2 JA |
5594 | spin_unlock_irq(&ctx->completion_lock); |
5595 | ||
8c838788 JA |
5596 | if (mask) { |
5597 | io_cqring_ev_posted(ctx); | |
014db007 | 5598 | io_put_req(req); |
221c5eb2 | 5599 | } |
8c838788 | 5600 | return ipt.error; |
221c5eb2 JA |
5601 | } |
5602 | ||
5262f567 JA |
5603 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5604 | { | |
ad8a48ac JA |
5605 | struct io_timeout_data *data = container_of(timer, |
5606 | struct io_timeout_data, timer); | |
5607 | struct io_kiocb *req = data->req; | |
5608 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5609 | unsigned long flags; |
5610 | ||
5262f567 | 5611 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5612 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5613 | atomic_set(&req->ctx->cq_timeouts, |
5614 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5615 | ||
78e19bbe | 5616 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5617 | io_commit_cqring(ctx); |
5618 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5619 | ||
5620 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5621 | req_set_fail_links(req); |
5262f567 JA |
5622 | io_put_req(req); |
5623 | return HRTIMER_NORESTART; | |
5624 | } | |
5625 | ||
f254ac04 JA |
5626 | static int __io_timeout_cancel(struct io_kiocb *req) |
5627 | { | |
e8c2bc1f | 5628 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5629 | int ret; |
5630 | ||
e8c2bc1f | 5631 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5632 | if (ret == -1) |
5633 | return -EALREADY; | |
a71976f3 | 5634 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5635 | |
5636 | req_set_fail_links(req); | |
f254ac04 | 5637 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5638 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5639 | return 0; |
5640 | } | |
5641 | ||
47f46768 JA |
5642 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5643 | { | |
5644 | struct io_kiocb *req; | |
5645 | int ret = -ENOENT; | |
5646 | ||
135fcde8 | 5647 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5648 | if (user_data == req->user_data) { |
47f46768 JA |
5649 | ret = 0; |
5650 | break; | |
5651 | } | |
5652 | } | |
5653 | ||
5654 | if (ret == -ENOENT) | |
5655 | return ret; | |
5656 | ||
f254ac04 | 5657 | return __io_timeout_cancel(req); |
47f46768 JA |
5658 | } |
5659 | ||
3529d8c2 JA |
5660 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5661 | const struct io_uring_sqe *sqe) | |
b29472ee | 5662 | { |
b29472ee JA |
5663 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5664 | return -EINVAL; | |
61710e43 DA |
5665 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5666 | return -EINVAL; | |
0bdf7a2d | 5667 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5668 | return -EINVAL; |
5669 | ||
0bdf7a2d | 5670 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5671 | return 0; |
5672 | } | |
5673 | ||
11365043 JA |
5674 | /* |
5675 | * Remove or update an existing timeout command | |
5676 | */ | |
fc4df999 | 5677 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5678 | { |
5679 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5680 | int ret; |
11365043 | 5681 | |
11365043 | 5682 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5683 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5684 | |
47f46768 | 5685 | io_cqring_fill_event(req, ret); |
11365043 JA |
5686 | io_commit_cqring(ctx); |
5687 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5688 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5689 | if (ret < 0) |
5690 | req_set_fail_links(req); | |
ec9c02ad | 5691 | io_put_req(req); |
11365043 | 5692 | return 0; |
5262f567 JA |
5693 | } |
5694 | ||
3529d8c2 | 5695 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5696 | bool is_timeout_link) |
5262f567 | 5697 | { |
ad8a48ac | 5698 | struct io_timeout_data *data; |
a41525ab | 5699 | unsigned flags; |
56080b02 | 5700 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5701 | |
ad8a48ac | 5702 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5703 | return -EINVAL; |
ad8a48ac | 5704 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5705 | return -EINVAL; |
56080b02 | 5706 | if (off && is_timeout_link) |
2d28390a | 5707 | return -EINVAL; |
a41525ab JA |
5708 | flags = READ_ONCE(sqe->timeout_flags); |
5709 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5710 | return -EINVAL; |
bdf20073 | 5711 | |
bfe68a22 | 5712 | req->timeout.off = off; |
26a61679 | 5713 | |
e8c2bc1f | 5714 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5715 | return -ENOMEM; |
5716 | ||
e8c2bc1f | 5717 | data = req->async_data; |
ad8a48ac | 5718 | data->req = req; |
ad8a48ac JA |
5719 | |
5720 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5721 | return -EFAULT; |
5722 | ||
11365043 | 5723 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5724 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5725 | else |
ad8a48ac | 5726 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5727 | |
ad8a48ac JA |
5728 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5729 | return 0; | |
5730 | } | |
5731 | ||
fc4df999 | 5732 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5733 | { |
ad8a48ac | 5734 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5735 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5736 | struct list_head *entry; |
bfe68a22 | 5737 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5738 | |
733f5c95 | 5739 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5740 | |
5262f567 JA |
5741 | /* |
5742 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5743 | * timeout event to be satisfied. If it isn't set, then this is |
5744 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5745 | */ |
8eb7e2d0 | 5746 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5747 | entry = ctx->timeout_list.prev; |
5748 | goto add; | |
5749 | } | |
5262f567 | 5750 | |
bfe68a22 PB |
5751 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5752 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5753 | |
5754 | /* | |
5755 | * Insertion sort, ensuring the first entry in the list is always | |
5756 | * the one we need first. | |
5757 | */ | |
5262f567 | 5758 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5759 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5760 | timeout.list); | |
5262f567 | 5761 | |
8eb7e2d0 | 5762 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5763 | continue; |
bfe68a22 PB |
5764 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5765 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5766 | break; |
5767 | } | |
93bd25bb | 5768 | add: |
135fcde8 | 5769 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5770 | data->timer.function = io_timeout_fn; |
5771 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5772 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5773 | return 0; |
5774 | } | |
5262f567 | 5775 | |
62755e35 JA |
5776 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5777 | { | |
5778 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5779 | ||
5780 | return req->user_data == (unsigned long) data; | |
5781 | } | |
5782 | ||
e977d6d3 | 5783 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5784 | { |
62755e35 | 5785 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5786 | int ret = 0; |
5787 | ||
4f26bda1 | 5788 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5789 | switch (cancel_ret) { |
5790 | case IO_WQ_CANCEL_OK: | |
5791 | ret = 0; | |
5792 | break; | |
5793 | case IO_WQ_CANCEL_RUNNING: | |
5794 | ret = -EALREADY; | |
5795 | break; | |
5796 | case IO_WQ_CANCEL_NOTFOUND: | |
5797 | ret = -ENOENT; | |
5798 | break; | |
5799 | } | |
5800 | ||
e977d6d3 JA |
5801 | return ret; |
5802 | } | |
5803 | ||
47f46768 JA |
5804 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5805 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5806 | int success_ret) |
47f46768 JA |
5807 | { |
5808 | unsigned long flags; | |
5809 | int ret; | |
5810 | ||
5811 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5812 | if (ret != -ENOENT) { | |
5813 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5814 | goto done; | |
5815 | } | |
5816 | ||
5817 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5818 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5819 | if (ret != -ENOENT) | |
5820 | goto done; | |
5821 | ret = io_poll_cancel(ctx, sqe_addr); | |
5822 | done: | |
b0dd8a41 JA |
5823 | if (!ret) |
5824 | ret = success_ret; | |
47f46768 JA |
5825 | io_cqring_fill_event(req, ret); |
5826 | io_commit_cqring(ctx); | |
5827 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5828 | io_cqring_ev_posted(ctx); | |
5829 | ||
4e88d6e7 JA |
5830 | if (ret < 0) |
5831 | req_set_fail_links(req); | |
014db007 | 5832 | io_put_req(req); |
47f46768 JA |
5833 | } |
5834 | ||
3529d8c2 JA |
5835 | static int io_async_cancel_prep(struct io_kiocb *req, |
5836 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5837 | { |
fbf23849 | 5838 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5839 | return -EINVAL; |
61710e43 DA |
5840 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5841 | return -EINVAL; | |
5842 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5843 | return -EINVAL; |
5844 | ||
fbf23849 JA |
5845 | req->cancel.addr = READ_ONCE(sqe->addr); |
5846 | return 0; | |
5847 | } | |
5848 | ||
014db007 | 5849 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5850 | { |
5851 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5852 | |
014db007 | 5853 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5854 | return 0; |
5855 | } | |
5856 | ||
05f3fb3c JA |
5857 | static int io_files_update_prep(struct io_kiocb *req, |
5858 | const struct io_uring_sqe *sqe) | |
5859 | { | |
6ca56f84 JA |
5860 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5861 | return -EINVAL; | |
61710e43 DA |
5862 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5863 | return -EINVAL; | |
5864 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5865 | return -EINVAL; |
5866 | ||
5867 | req->files_update.offset = READ_ONCE(sqe->off); | |
5868 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5869 | if (!req->files_update.nr_args) | |
5870 | return -EINVAL; | |
5871 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5872 | return 0; | |
5873 | } | |
5874 | ||
229a7b63 JA |
5875 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5876 | struct io_comp_state *cs) | |
fbf23849 JA |
5877 | { |
5878 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5879 | struct io_uring_files_update up; |
5880 | int ret; | |
fbf23849 | 5881 | |
f86cd20c | 5882 | if (force_nonblock) |
05f3fb3c | 5883 | return -EAGAIN; |
05f3fb3c JA |
5884 | |
5885 | up.offset = req->files_update.offset; | |
5886 | up.fds = req->files_update.arg; | |
5887 | ||
5888 | mutex_lock(&ctx->uring_lock); | |
5889 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5890 | mutex_unlock(&ctx->uring_lock); | |
5891 | ||
5892 | if (ret < 0) | |
5893 | req_set_fail_links(req); | |
229a7b63 | 5894 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5895 | return 0; |
5896 | } | |
5897 | ||
bfe76559 | 5898 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5899 | { |
d625c6ee | 5900 | switch (req->opcode) { |
e781573e | 5901 | case IORING_OP_NOP: |
bfe76559 | 5902 | return 0; |
f67676d1 JA |
5903 | case IORING_OP_READV: |
5904 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5905 | case IORING_OP_READ: |
bfe76559 | 5906 | return io_read_prep(req, sqe); |
f67676d1 JA |
5907 | case IORING_OP_WRITEV: |
5908 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5909 | case IORING_OP_WRITE: |
bfe76559 | 5910 | return io_write_prep(req, sqe); |
0969e783 | 5911 | case IORING_OP_POLL_ADD: |
bfe76559 | 5912 | return io_poll_add_prep(req, sqe); |
0969e783 | 5913 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5914 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5915 | case IORING_OP_FSYNC: |
bfe76559 | 5916 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5917 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5918 | return io_prep_sfr(req, sqe); |
03b1230c | 5919 | case IORING_OP_SENDMSG: |
fddaface | 5920 | case IORING_OP_SEND: |
bfe76559 | 5921 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5922 | case IORING_OP_RECVMSG: |
fddaface | 5923 | case IORING_OP_RECV: |
bfe76559 | 5924 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5925 | case IORING_OP_CONNECT: |
bfe76559 | 5926 | return io_connect_prep(req, sqe); |
2d28390a | 5927 | case IORING_OP_TIMEOUT: |
bfe76559 | 5928 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5929 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5930 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5931 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5932 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5933 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5934 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5935 | case IORING_OP_ACCEPT: |
bfe76559 | 5936 | return io_accept_prep(req, sqe); |
d63d1b5e | 5937 | case IORING_OP_FALLOCATE: |
bfe76559 | 5938 | return io_fallocate_prep(req, sqe); |
15b71abe | 5939 | case IORING_OP_OPENAT: |
bfe76559 | 5940 | return io_openat_prep(req, sqe); |
b5dba59e | 5941 | case IORING_OP_CLOSE: |
bfe76559 | 5942 | return io_close_prep(req, sqe); |
05f3fb3c | 5943 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5944 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5945 | case IORING_OP_STATX: |
bfe76559 | 5946 | return io_statx_prep(req, sqe); |
4840e418 | 5947 | case IORING_OP_FADVISE: |
bfe76559 | 5948 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5949 | case IORING_OP_MADVISE: |
bfe76559 | 5950 | return io_madvise_prep(req, sqe); |
cebdb986 | 5951 | case IORING_OP_OPENAT2: |
bfe76559 | 5952 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5953 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5954 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5955 | case IORING_OP_SPLICE: |
bfe76559 | 5956 | return io_splice_prep(req, sqe); |
ddf0322d | 5957 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5958 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5959 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5960 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5961 | case IORING_OP_TEE: |
bfe76559 | 5962 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5963 | case IORING_OP_SHUTDOWN: |
5964 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5965 | case IORING_OP_RENAMEAT: |
5966 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5967 | case IORING_OP_UNLINKAT: |
5968 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5969 | } |
5970 | ||
bfe76559 PB |
5971 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5972 | req->opcode); | |
5973 | return-EINVAL; | |
5974 | } | |
5975 | ||
5976 | static int io_req_defer_prep(struct io_kiocb *req, | |
5977 | const struct io_uring_sqe *sqe) | |
5978 | { | |
bfe76559 PB |
5979 | if (!sqe) |
5980 | return 0; | |
5981 | if (io_alloc_async_data(req)) | |
5982 | return -EAGAIN; | |
bfe76559 | 5983 | return io_req_prep(req, sqe); |
f67676d1 JA |
5984 | } |
5985 | ||
9cf7c104 PB |
5986 | static u32 io_get_sequence(struct io_kiocb *req) |
5987 | { | |
5988 | struct io_kiocb *pos; | |
5989 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 5990 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 5991 | |
f2f87370 PB |
5992 | io_for_each_link(pos, req) |
5993 | nr_reqs++; | |
9cf7c104 PB |
5994 | |
5995 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5996 | return total_submitted - nr_reqs; | |
5997 | } | |
5998 | ||
3529d8c2 | 5999 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6000 | { |
a197f664 | 6001 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6002 | struct io_defer_entry *de; |
f67676d1 | 6003 | int ret; |
9cf7c104 | 6004 | u32 seq; |
de0617e4 | 6005 | |
9d858b21 | 6006 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6007 | if (likely(list_empty_careful(&ctx->defer_list) && |
6008 | !(req->flags & REQ_F_IO_DRAIN))) | |
6009 | return 0; | |
6010 | ||
6011 | seq = io_get_sequence(req); | |
6012 | /* Still a chance to pass the sequence check */ | |
6013 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6014 | return 0; |
6015 | ||
e8c2bc1f | 6016 | if (!req->async_data) { |
650b5481 | 6017 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6018 | if (ret) |
650b5481 PB |
6019 | return ret; |
6020 | } | |
cbdcb435 | 6021 | io_prep_async_link(req); |
27dc8338 PB |
6022 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6023 | if (!de) | |
6024 | return -ENOMEM; | |
2d28390a | 6025 | |
de0617e4 | 6026 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6027 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6028 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6029 | kfree(de); |
ae34817b PB |
6030 | io_queue_async_work(req); |
6031 | return -EIOCBQUEUED; | |
de0617e4 JA |
6032 | } |
6033 | ||
915967f6 | 6034 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6035 | de->req = req; |
9cf7c104 | 6036 | de->seq = seq; |
27dc8338 | 6037 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6038 | spin_unlock_irq(&ctx->completion_lock); |
6039 | return -EIOCBQUEUED; | |
6040 | } | |
6041 | ||
f573d384 | 6042 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6043 | { |
f573d384 JA |
6044 | struct io_ring_ctx *ctx = req->ctx; |
6045 | unsigned long flags; | |
6046 | ||
6047 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
6048 | list_del(&req->inflight_entry); | |
6049 | if (waitqueue_active(&ctx->inflight_wait)) | |
6050 | wake_up(&ctx->inflight_wait); | |
6051 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
6052 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
6053 | put_files_struct(req->work.identity->files); |
6054 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 6055 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 6056 | } |
99bc4c38 | 6057 | |
3ca405eb | 6058 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6059 | { |
0e1b6fe3 PB |
6060 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6061 | switch (req->opcode) { | |
6062 | case IORING_OP_READV: | |
6063 | case IORING_OP_READ_FIXED: | |
6064 | case IORING_OP_READ: | |
bcda7baa | 6065 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6066 | break; |
6067 | case IORING_OP_RECVMSG: | |
6068 | case IORING_OP_RECV: | |
bcda7baa | 6069 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6070 | break; |
6071 | } | |
6072 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6073 | } |
6074 | ||
0e1b6fe3 PB |
6075 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6076 | switch (req->opcode) { | |
6077 | case IORING_OP_READV: | |
6078 | case IORING_OP_READ_FIXED: | |
6079 | case IORING_OP_READ: | |
6080 | case IORING_OP_WRITEV: | |
6081 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6082 | case IORING_OP_WRITE: { |
6083 | struct io_async_rw *io = req->async_data; | |
6084 | if (io->free_iovec) | |
6085 | kfree(io->free_iovec); | |
0e1b6fe3 | 6086 | break; |
e8c2bc1f | 6087 | } |
0e1b6fe3 | 6088 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6089 | case IORING_OP_SENDMSG: { |
6090 | struct io_async_msghdr *io = req->async_data; | |
6091 | if (io->iov != io->fast_iov) | |
6092 | kfree(io->iov); | |
0e1b6fe3 | 6093 | break; |
e8c2bc1f | 6094 | } |
0e1b6fe3 PB |
6095 | case IORING_OP_SPLICE: |
6096 | case IORING_OP_TEE: | |
6097 | io_put_file(req, req->splice.file_in, | |
6098 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6099 | break; | |
f3cd4850 JA |
6100 | case IORING_OP_OPENAT: |
6101 | case IORING_OP_OPENAT2: | |
6102 | if (req->open.filename) | |
6103 | putname(req->open.filename); | |
6104 | break; | |
80a261fd JA |
6105 | case IORING_OP_RENAMEAT: |
6106 | putname(req->rename.oldpath); | |
6107 | putname(req->rename.newpath); | |
6108 | break; | |
14a1143b JA |
6109 | case IORING_OP_UNLINKAT: |
6110 | putname(req->unlink.filename); | |
6111 | break; | |
0e1b6fe3 PB |
6112 | } |
6113 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6114 | } |
bb175342 | 6115 | |
f573d384 JA |
6116 | if (req->flags & REQ_F_INFLIGHT) |
6117 | io_req_drop_files(req); | |
99bc4c38 PB |
6118 | } |
6119 | ||
c1379e24 PB |
6120 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6121 | struct io_comp_state *cs) | |
2b188cc1 | 6122 | { |
a197f664 | 6123 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6124 | int ret; |
2b188cc1 | 6125 | |
d625c6ee | 6126 | switch (req->opcode) { |
2b188cc1 | 6127 | case IORING_OP_NOP: |
229a7b63 | 6128 | ret = io_nop(req, cs); |
2b188cc1 JA |
6129 | break; |
6130 | case IORING_OP_READV: | |
edafccee | 6131 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6132 | case IORING_OP_READ: |
a1d7c393 | 6133 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6134 | break; |
3529d8c2 | 6135 | case IORING_OP_WRITEV: |
edafccee | 6136 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6137 | case IORING_OP_WRITE: |
a1d7c393 | 6138 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6139 | break; |
c992fe29 | 6140 | case IORING_OP_FSYNC: |
014db007 | 6141 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6142 | break; |
221c5eb2 | 6143 | case IORING_OP_POLL_ADD: |
014db007 | 6144 | ret = io_poll_add(req); |
221c5eb2 JA |
6145 | break; |
6146 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6147 | ret = io_poll_remove(req); |
221c5eb2 | 6148 | break; |
5d17b4a4 | 6149 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6150 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6151 | break; |
0fa03c62 | 6152 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6153 | ret = io_sendmsg(req, force_nonblock, cs); |
6154 | break; | |
fddaface | 6155 | case IORING_OP_SEND: |
062d04d7 | 6156 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6157 | break; |
aa1fa28f | 6158 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6159 | ret = io_recvmsg(req, force_nonblock, cs); |
6160 | break; | |
fddaface | 6161 | case IORING_OP_RECV: |
062d04d7 | 6162 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6163 | break; |
5262f567 | 6164 | case IORING_OP_TIMEOUT: |
fc4df999 | 6165 | ret = io_timeout(req); |
5262f567 | 6166 | break; |
11365043 | 6167 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6168 | ret = io_timeout_remove(req); |
11365043 | 6169 | break; |
17f2fe35 | 6170 | case IORING_OP_ACCEPT: |
229a7b63 | 6171 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6172 | break; |
f8e85cf2 | 6173 | case IORING_OP_CONNECT: |
229a7b63 | 6174 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6175 | break; |
62755e35 | 6176 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6177 | ret = io_async_cancel(req); |
62755e35 | 6178 | break; |
d63d1b5e | 6179 | case IORING_OP_FALLOCATE: |
014db007 | 6180 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6181 | break; |
15b71abe | 6182 | case IORING_OP_OPENAT: |
014db007 | 6183 | ret = io_openat(req, force_nonblock); |
15b71abe | 6184 | break; |
b5dba59e | 6185 | case IORING_OP_CLOSE: |
229a7b63 | 6186 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6187 | break; |
05f3fb3c | 6188 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6189 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6190 | break; |
eddc7ef5 | 6191 | case IORING_OP_STATX: |
014db007 | 6192 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6193 | break; |
4840e418 | 6194 | case IORING_OP_FADVISE: |
014db007 | 6195 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6196 | break; |
c1ca757b | 6197 | case IORING_OP_MADVISE: |
014db007 | 6198 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6199 | break; |
cebdb986 | 6200 | case IORING_OP_OPENAT2: |
014db007 | 6201 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6202 | break; |
3e4827b0 | 6203 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6204 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6205 | break; |
7d67af2c | 6206 | case IORING_OP_SPLICE: |
014db007 | 6207 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6208 | break; |
ddf0322d | 6209 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6210 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6211 | break; |
067524e9 | 6212 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6213 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6214 | break; |
f2a8d5c7 | 6215 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6216 | ret = io_tee(req, force_nonblock); |
6217 | break; | |
36f4fa68 JA |
6218 | case IORING_OP_SHUTDOWN: |
6219 | ret = io_shutdown(req, force_nonblock); | |
6220 | break; | |
80a261fd JA |
6221 | case IORING_OP_RENAMEAT: |
6222 | ret = io_renameat(req, force_nonblock); | |
6223 | break; | |
14a1143b JA |
6224 | case IORING_OP_UNLINKAT: |
6225 | ret = io_unlinkat(req, force_nonblock); | |
6226 | break; | |
2b188cc1 JA |
6227 | default: |
6228 | ret = -EINVAL; | |
6229 | break; | |
6230 | } | |
6231 | ||
def596e9 JA |
6232 | if (ret) |
6233 | return ret; | |
6234 | ||
b532576e JA |
6235 | /* If the op doesn't have a file, we're not polling for it */ |
6236 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6237 | const bool in_async = io_wq_current_is_worker(); |
6238 | ||
11ba820b JA |
6239 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6240 | if (in_async) | |
6241 | mutex_lock(&ctx->uring_lock); | |
6242 | ||
def596e9 | 6243 | io_iopoll_req_issued(req); |
11ba820b JA |
6244 | |
6245 | if (in_async) | |
6246 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6247 | } |
6248 | ||
6249 | return 0; | |
2b188cc1 JA |
6250 | } |
6251 | ||
f4db7182 | 6252 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6253 | { |
6254 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6255 | struct io_kiocb *timeout; |
561fb04a | 6256 | int ret = 0; |
2b188cc1 | 6257 | |
6df1db6b PB |
6258 | timeout = io_prep_linked_timeout(req); |
6259 | if (timeout) | |
6260 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6261 | |
0c9d5ccd JA |
6262 | /* if NO_CANCEL is set, we must still run the work */ |
6263 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6264 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6265 | ret = -ECANCELED; |
0c9d5ccd | 6266 | } |
31b51510 | 6267 | |
561fb04a | 6268 | if (!ret) { |
561fb04a | 6269 | do { |
c1379e24 | 6270 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6271 | /* |
6272 | * We can get EAGAIN for polled IO even though we're | |
6273 | * forcing a sync submission from here, since we can't | |
6274 | * wait for request slots on the block side. | |
6275 | */ | |
6276 | if (ret != -EAGAIN) | |
6277 | break; | |
6278 | cond_resched(); | |
6279 | } while (1); | |
6280 | } | |
31b51510 | 6281 | |
561fb04a | 6282 | if (ret) { |
4e88d6e7 | 6283 | req_set_fail_links(req); |
e1e16097 | 6284 | io_req_complete(req, ret); |
edafccee | 6285 | } |
2b188cc1 | 6286 | |
f4db7182 | 6287 | return io_steal_work(req); |
2b188cc1 JA |
6288 | } |
6289 | ||
65e19f54 JA |
6290 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6291 | int index) | |
6292 | { | |
6293 | struct fixed_file_table *table; | |
6294 | ||
05f3fb3c | 6295 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6296 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6297 | } |
6298 | ||
8371adf5 PB |
6299 | static struct file *io_file_get(struct io_submit_state *state, |
6300 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6301 | { |
a197f664 | 6302 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6303 | struct file *file; |
09bb8394 | 6304 | |
8da11c19 | 6305 | if (fixed) { |
479f517b | 6306 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6307 | return NULL; |
b7620121 | 6308 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6309 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6310 | if (file) { |
b2e96852 | 6311 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6312 | percpu_ref_get(req->fixed_file_refs); |
6313 | } | |
09bb8394 | 6314 | } else { |
c826bd7a | 6315 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6316 | file = __io_file_get(state, fd); |
09bb8394 JA |
6317 | } |
6318 | ||
8371adf5 | 6319 | return file; |
09bb8394 JA |
6320 | } |
6321 | ||
8da11c19 | 6322 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6323 | int fd) |
8da11c19 | 6324 | { |
28cea78a | 6325 | req->file = io_file_get(state, req, fd, req->flags & REQ_F_FIXED_FILE); |
8371adf5 | 6326 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) |
f86cd20c | 6327 | return 0; |
8371adf5 | 6328 | return -EBADF; |
f56040b8 PB |
6329 | } |
6330 | ||
2665abfd | 6331 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6332 | { |
ad8a48ac JA |
6333 | struct io_timeout_data *data = container_of(timer, |
6334 | struct io_timeout_data, timer); | |
90cd7e42 | 6335 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6336 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6337 | unsigned long flags; |
2665abfd JA |
6338 | |
6339 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6340 | prev = req->timeout.head; |
6341 | req->timeout.head = NULL; | |
2665abfd JA |
6342 | |
6343 | /* | |
6344 | * We don't expect the list to be empty, that will only happen if we | |
6345 | * race with the completion of the linked work. | |
6346 | */ | |
90cd7e42 | 6347 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6348 | io_remove_next_linked(prev); |
90cd7e42 PB |
6349 | else |
6350 | prev = NULL; | |
2665abfd JA |
6351 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6352 | ||
6353 | if (prev) { | |
4e88d6e7 | 6354 | req_set_fail_links(prev); |
014db007 | 6355 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6356 | io_put_req(prev); |
47f46768 | 6357 | } else { |
e1e16097 | 6358 | io_req_complete(req, -ETIME); |
2665abfd | 6359 | } |
2665abfd JA |
6360 | return HRTIMER_NORESTART; |
6361 | } | |
6362 | ||
7271ef3a | 6363 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6364 | { |
76a46e06 | 6365 | /* |
f2f87370 PB |
6366 | * If the back reference is NULL, then our linked request finished |
6367 | * before we got a chance to setup the timer | |
76a46e06 | 6368 | */ |
90cd7e42 | 6369 | if (req->timeout.head) { |
e8c2bc1f | 6370 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6371 | |
ad8a48ac JA |
6372 | data->timer.function = io_link_timeout_fn; |
6373 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6374 | data->mode); | |
2665abfd | 6375 | } |
7271ef3a JA |
6376 | } |
6377 | ||
6378 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6379 | { | |
6380 | struct io_ring_ctx *ctx = req->ctx; | |
6381 | ||
6382 | spin_lock_irq(&ctx->completion_lock); | |
6383 | __io_queue_linked_timeout(req); | |
76a46e06 | 6384 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6385 | |
2665abfd | 6386 | /* drop submission reference */ |
76a46e06 JA |
6387 | io_put_req(req); |
6388 | } | |
2665abfd | 6389 | |
ad8a48ac | 6390 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6391 | { |
f2f87370 | 6392 | struct io_kiocb *nxt = req->link; |
2665abfd | 6393 | |
f2f87370 PB |
6394 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6395 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6396 | return NULL; |
2665abfd | 6397 | |
90cd7e42 | 6398 | nxt->timeout.head = req; |
900fad45 | 6399 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6400 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6401 | return nxt; |
2665abfd JA |
6402 | } |
6403 | ||
c1379e24 | 6404 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6405 | { |
4a0a7a18 | 6406 | struct io_kiocb *linked_timeout; |
193155c8 | 6407 | const struct cred *old_creds = NULL; |
e0c5c576 | 6408 | int ret; |
2b188cc1 | 6409 | |
4a0a7a18 JA |
6410 | again: |
6411 | linked_timeout = io_prep_linked_timeout(req); | |
6412 | ||
2e5aa6cb PB |
6413 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6414 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6415 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6416 | if (old_creds) |
6417 | revert_creds(old_creds); | |
98447d65 | 6418 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6419 | old_creds = NULL; /* restored original creds */ |
6420 | else | |
98447d65 | 6421 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6422 | } |
6423 | ||
c1379e24 | 6424 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6425 | |
6426 | /* | |
6427 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6428 | * doesn't support non-blocking read/write attempts | |
6429 | */ | |
24c74678 | 6430 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6431 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6432 | /* |
6433 | * Queued up for async execution, worker will release | |
6434 | * submit reference when the iocb is actually submitted. | |
6435 | */ | |
6436 | io_queue_async_work(req); | |
2b188cc1 | 6437 | } |
bbad27b2 | 6438 | |
f063c547 PB |
6439 | if (linked_timeout) |
6440 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6441 | } else if (likely(!ret)) { |
6442 | /* drop submission reference */ | |
6443 | req = io_put_req_find_next(req); | |
6444 | if (linked_timeout) | |
6445 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6446 | |
0d63c148 PB |
6447 | if (req) { |
6448 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6449 | goto again; | |
6450 | io_queue_async_work(req); | |
6451 | } | |
6452 | } else { | |
652532ad PB |
6453 | /* un-prep timeout, so it'll be killed as any other linked */ |
6454 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6455 | req_set_fail_links(req); |
e65ef56d | 6456 | io_put_req(req); |
e1e16097 | 6457 | io_req_complete(req, ret); |
9e645e11 | 6458 | } |
652532ad | 6459 | |
193155c8 JA |
6460 | if (old_creds) |
6461 | revert_creds(old_creds); | |
2b188cc1 JA |
6462 | } |
6463 | ||
f13fad7b JA |
6464 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6465 | struct io_comp_state *cs) | |
4fe2c963 JL |
6466 | { |
6467 | int ret; | |
6468 | ||
3529d8c2 | 6469 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6470 | if (ret) { |
6471 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6472 | fail_req: |
4e88d6e7 | 6473 | req_set_fail_links(req); |
e1e16097 JA |
6474 | io_put_req(req); |
6475 | io_req_complete(req, ret); | |
4fe2c963 | 6476 | } |
2550878f | 6477 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6478 | if (!req->async_data) { |
bd2ab18a | 6479 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6480 | if (unlikely(ret)) |
bd2ab18a PB |
6481 | goto fail_req; |
6482 | } | |
ce35a47a JA |
6483 | io_queue_async_work(req); |
6484 | } else { | |
c1379e24 PB |
6485 | if (sqe) { |
6486 | ret = io_req_prep(req, sqe); | |
6487 | if (unlikely(ret)) | |
6488 | goto fail_req; | |
6489 | } | |
6490 | __io_queue_sqe(req, cs); | |
ce35a47a | 6491 | } |
4fe2c963 JL |
6492 | } |
6493 | ||
f13fad7b JA |
6494 | static inline void io_queue_link_head(struct io_kiocb *req, |
6495 | struct io_comp_state *cs) | |
4fe2c963 | 6496 | { |
94ae5e77 | 6497 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6498 | io_put_req(req); |
6499 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6500 | } else |
f13fad7b | 6501 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6502 | } |
6503 | ||
863e0560 PB |
6504 | struct io_submit_link { |
6505 | struct io_kiocb *head; | |
6506 | struct io_kiocb *last; | |
6507 | }; | |
6508 | ||
1d4240cc | 6509 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
863e0560 | 6510 | struct io_submit_link *link, struct io_comp_state *cs) |
9e645e11 | 6511 | { |
a197f664 | 6512 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6513 | int ret; |
9e645e11 | 6514 | |
9e645e11 JA |
6515 | /* |
6516 | * If we already have a head request, queue this one for async | |
6517 | * submittal once the head completes. If we don't have a head but | |
6518 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6519 | * submitted sync once the chain is complete. If none of those | |
6520 | * conditions are true (normal request), then just queue it. | |
6521 | */ | |
863e0560 PB |
6522 | if (link->head) { |
6523 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6524 | |
8cdf2193 PB |
6525 | /* |
6526 | * Taking sequential execution of a link, draining both sides | |
6527 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6528 | * requests in the link. So, it drains the head and the | |
6529 | * next after the link request. The last one is done via | |
6530 | * drain_next flag to persist the effect across calls. | |
6531 | */ | |
ef4ff581 | 6532 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6533 | head->flags |= REQ_F_IO_DRAIN; |
6534 | ctx->drain_next = 1; | |
6535 | } | |
3529d8c2 | 6536 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6537 | if (unlikely(ret)) { |
4e88d6e7 | 6538 | /* fail even hard links since we don't submit */ |
9d76377f | 6539 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6540 | return ret; |
2d28390a | 6541 | } |
9d76377f | 6542 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6543 | link->last->link = req; |
863e0560 | 6544 | link->last = req; |
32fe525b PB |
6545 | |
6546 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6547 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6548 | io_queue_link_head(head, cs); |
863e0560 | 6549 | link->head = NULL; |
32fe525b | 6550 | } |
9e645e11 | 6551 | } else { |
711be031 PB |
6552 | if (unlikely(ctx->drain_next)) { |
6553 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6554 | ctx->drain_next = 0; |
711be031 | 6555 | } |
ef4ff581 | 6556 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6557 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6558 | if (unlikely(ret)) |
711be031 | 6559 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6560 | link->head = req; |
6561 | link->last = req; | |
711be031 | 6562 | } else { |
f13fad7b | 6563 | io_queue_sqe(req, sqe, cs); |
711be031 | 6564 | } |
9e645e11 | 6565 | } |
2e6e1fde | 6566 | |
1d4240cc | 6567 | return 0; |
9e645e11 JA |
6568 | } |
6569 | ||
9a56a232 JA |
6570 | /* |
6571 | * Batched submission is done, ensure local IO is flushed out. | |
6572 | */ | |
6573 | static void io_submit_state_end(struct io_submit_state *state) | |
6574 | { | |
f13fad7b JA |
6575 | if (!list_empty(&state->comp.list)) |
6576 | io_submit_flush_completions(&state->comp); | |
27926b68 JA |
6577 | if (state->plug_started) |
6578 | blk_finish_plug(&state->plug); | |
9f13c35b | 6579 | io_state_file_put(state); |
2579f913 | 6580 | if (state->free_reqs) |
6c8a3134 | 6581 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6582 | } |
6583 | ||
6584 | /* | |
6585 | * Start submission side cache. | |
6586 | */ | |
6587 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6588 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 | 6589 | { |
27926b68 | 6590 | state->plug_started = false; |
013538bd JA |
6591 | state->comp.nr = 0; |
6592 | INIT_LIST_HEAD(&state->comp.list); | |
6593 | state->comp.ctx = ctx; | |
2579f913 | 6594 | state->free_reqs = 0; |
9a56a232 JA |
6595 | state->file = NULL; |
6596 | state->ios_left = max_ios; | |
6597 | } | |
6598 | ||
2b188cc1 JA |
6599 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6600 | { | |
75b28aff | 6601 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6602 | |
caf582c6 PB |
6603 | /* |
6604 | * Ensure any loads from the SQEs are done at this point, | |
6605 | * since once we write the new head, the application could | |
6606 | * write new data to them. | |
6607 | */ | |
6608 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6609 | } |
6610 | ||
2b188cc1 | 6611 | /* |
3529d8c2 | 6612 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6613 | * that is mapped by userspace. This means that care needs to be taken to |
6614 | * ensure that reads are stable, as we cannot rely on userspace always | |
6615 | * being a good citizen. If members of the sqe are validated and then later | |
6616 | * used, it's important that those reads are done through READ_ONCE() to | |
6617 | * prevent a re-load down the line. | |
6618 | */ | |
709b302f | 6619 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6620 | { |
75b28aff | 6621 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6622 | unsigned head; |
6623 | ||
6624 | /* | |
6625 | * The cached sq head (or cq tail) serves two purposes: | |
6626 | * | |
6627 | * 1) allows us to batch the cost of updating the user visible | |
6628 | * head updates. | |
6629 | * 2) allows the kernel side to track the head on its own, even | |
6630 | * though the application is the one updating it. | |
6631 | */ | |
ee7d46d9 | 6632 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6633 | if (likely(head < ctx->sq_entries)) |
6634 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6635 | |
6636 | /* drop invalid entries */ | |
498ccd9e | 6637 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6638 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6639 | return NULL; |
6640 | } | |
6641 | ||
6642 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6643 | { | |
6644 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6645 | } |
6646 | ||
21b55dbc SG |
6647 | /* |
6648 | * Check SQE restrictions (opcode and flags). | |
6649 | * | |
6650 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6651 | */ | |
6652 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6653 | struct io_kiocb *req, | |
6654 | unsigned int sqe_flags) | |
6655 | { | |
6656 | if (!ctx->restricted) | |
6657 | return true; | |
6658 | ||
6659 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6660 | return false; | |
6661 | ||
6662 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6663 | ctx->restrictions.sqe_flags_required) | |
6664 | return false; | |
6665 | ||
6666 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6667 | ctx->restrictions.sqe_flags_required)) | |
6668 | return false; | |
6669 | ||
6670 | return true; | |
6671 | } | |
6672 | ||
ef4ff581 PB |
6673 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6674 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6675 | IOSQE_BUFFER_SELECT) | |
6676 | ||
6677 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6678 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6679 | struct io_submit_state *state) |
0553b8bd | 6680 | { |
ef4ff581 | 6681 | unsigned int sqe_flags; |
71b547c0 | 6682 | int id, ret; |
ef4ff581 | 6683 | |
0553b8bd PB |
6684 | req->opcode = READ_ONCE(sqe->opcode); |
6685 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6686 | req->async_data = NULL; |
0553b8bd PB |
6687 | req->file = NULL; |
6688 | req->ctx = ctx; | |
6689 | req->flags = 0; | |
f2f87370 | 6690 | req->link = NULL; |
0553b8bd PB |
6691 | /* one is dropped after submission, the other at completion */ |
6692 | refcount_set(&req->refs, 2); | |
4dd2824d | 6693 | req->task = current; |
0553b8bd | 6694 | req->result = 0; |
ef4ff581 PB |
6695 | |
6696 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6697 | return -EINVAL; | |
6698 | ||
28cea78a | 6699 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6700 | return -EFAULT; |
ef4ff581 PB |
6701 | |
6702 | sqe_flags = READ_ONCE(sqe->flags); | |
6703 | /* enforce forwards compatibility on users */ | |
6704 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6705 | return -EINVAL; | |
6706 | ||
21b55dbc SG |
6707 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6708 | return -EACCES; | |
6709 | ||
ef4ff581 PB |
6710 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6711 | !io_op_defs[req->opcode].buffer_select) | |
6712 | return -EOPNOTSUPP; | |
6713 | ||
6714 | id = READ_ONCE(sqe->personality); | |
6715 | if (id) { | |
1e6fa521 JA |
6716 | struct io_identity *iod; |
6717 | ||
1e6fa521 JA |
6718 | iod = idr_find(&ctx->personality_idr, id); |
6719 | if (unlikely(!iod)) | |
ef4ff581 | 6720 | return -EINVAL; |
1e6fa521 | 6721 | refcount_inc(&iod->count); |
ec99ca6c PB |
6722 | |
6723 | __io_req_init_async(req); | |
1e6fa521 JA |
6724 | get_cred(iod->creds); |
6725 | req->work.identity = iod; | |
dfead8a8 | 6726 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6727 | } |
6728 | ||
6729 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6730 | req->flags |= sqe_flags; |
ef4ff581 | 6731 | |
27926b68 JA |
6732 | /* |
6733 | * Plug now if we have more than 1 IO left after this, and the target | |
6734 | * is potentially a read/write to block based storage. | |
6735 | */ | |
6736 | if (!state->plug_started && state->ios_left > 1 && | |
6737 | io_op_defs[req->opcode].plug) { | |
6738 | blk_start_plug(&state->plug); | |
6739 | state->plug_started = true; | |
6740 | } | |
6741 | ||
63ff8223 JA |
6742 | if (!io_op_defs[req->opcode].needs_file) |
6743 | return 0; | |
6744 | ||
71b547c0 PB |
6745 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6746 | state->ios_left--; | |
6747 | return ret; | |
0553b8bd PB |
6748 | } |
6749 | ||
0f212204 | 6750 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6751 | { |
ac8691c4 | 6752 | struct io_submit_state state; |
863e0560 | 6753 | struct io_submit_link link; |
9e645e11 | 6754 | int i, submitted = 0; |
6c271ce2 | 6755 | |
c4a2ed72 | 6756 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6757 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6758 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6759 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6760 | return -EBUSY; |
6761 | } | |
6c271ce2 | 6762 | |
ee7d46d9 PB |
6763 | /* make sure SQ entry isn't read before tail */ |
6764 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6765 | |
2b85edfc PB |
6766 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6767 | return -EAGAIN; | |
6c271ce2 | 6768 | |
d8a6df10 | 6769 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6770 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6771 | |
013538bd | 6772 | io_submit_state_start(&state, ctx, nr); |
863e0560 | 6773 | link.head = NULL; |
b14cca0c | 6774 | |
6c271ce2 | 6775 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6776 | const struct io_uring_sqe *sqe; |
196be95c | 6777 | struct io_kiocb *req; |
1cb1edb2 | 6778 | int err; |
fb5ccc98 | 6779 | |
b1e50e54 PB |
6780 | sqe = io_get_sqe(ctx); |
6781 | if (unlikely(!sqe)) { | |
6782 | io_consume_sqe(ctx); | |
6783 | break; | |
6784 | } | |
ac8691c4 | 6785 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6786 | if (unlikely(!req)) { |
6787 | if (!submitted) | |
6788 | submitted = -EAGAIN; | |
fb5ccc98 | 6789 | break; |
196be95c | 6790 | } |
709b302f | 6791 | io_consume_sqe(ctx); |
d3656344 JA |
6792 | /* will complete beyond this point, count as submitted */ |
6793 | submitted++; | |
6794 | ||
692d8363 | 6795 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6796 | if (unlikely(err)) { |
1cb1edb2 | 6797 | fail_req: |
e1e16097 JA |
6798 | io_put_req(req); |
6799 | io_req_complete(req, err); | |
196be95c PB |
6800 | break; |
6801 | } | |
fb5ccc98 | 6802 | |
354420f7 | 6803 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6804 | true, io_async_submit(ctx)); |
f13fad7b | 6805 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6806 | if (err) |
6807 | goto fail_req; | |
6c271ce2 JA |
6808 | } |
6809 | ||
9466f437 PB |
6810 | if (unlikely(submitted != nr)) { |
6811 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6812 | struct io_uring_task *tctx = current->io_uring; |
6813 | int unused = nr - ref_used; | |
9466f437 | 6814 | |
d8a6df10 JA |
6815 | percpu_ref_put_many(&ctx->refs, unused); |
6816 | percpu_counter_sub(&tctx->inflight, unused); | |
6817 | put_task_struct_many(current, unused); | |
9466f437 | 6818 | } |
863e0560 PB |
6819 | if (link.head) |
6820 | io_queue_link_head(link.head, &state.comp); | |
ac8691c4 | 6821 | io_submit_state_end(&state); |
6c271ce2 | 6822 | |
ae9428ca PB |
6823 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6824 | io_commit_sqring(ctx); | |
6825 | ||
6c271ce2 JA |
6826 | return submitted; |
6827 | } | |
6828 | ||
23b3628e XW |
6829 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6830 | { | |
6831 | /* Tell userspace we may need a wakeup call */ | |
6832 | spin_lock_irq(&ctx->completion_lock); | |
6833 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6834 | spin_unlock_irq(&ctx->completion_lock); | |
6835 | } | |
6836 | ||
6837 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6838 | { | |
6839 | spin_lock_irq(&ctx->completion_lock); | |
6840 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6841 | spin_unlock_irq(&ctx->completion_lock); | |
6842 | } | |
6843 | ||
3f0e64d0 JA |
6844 | static int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode, |
6845 | int sync, void *key) | |
6c271ce2 | 6846 | { |
3f0e64d0 JA |
6847 | struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry); |
6848 | int ret; | |
6849 | ||
6850 | ret = autoremove_wake_function(wqe, mode, sync, key); | |
6851 | if (ret) { | |
6852 | unsigned long flags; | |
6853 | ||
6854 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6855 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6856 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6857 | } | |
6858 | return ret; | |
6859 | } | |
6860 | ||
c8d1ba58 JA |
6861 | enum sq_ret { |
6862 | SQT_IDLE = 1, | |
6863 | SQT_SPIN = 2, | |
6864 | SQT_DID_WORK = 4, | |
6865 | }; | |
6866 | ||
6867 | static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx, | |
e95eee2d | 6868 | unsigned long start_jiffies, bool cap_entries) |
6c271ce2 | 6869 | { |
c8d1ba58 | 6870 | unsigned long timeout = start_jiffies + ctx->sq_thread_idle; |
534ca6d6 | 6871 | struct io_sq_data *sqd = ctx->sq_data; |
c8d1ba58 | 6872 | unsigned int to_submit; |
bdcd3eab | 6873 | int ret = 0; |
6c271ce2 | 6874 | |
c8d1ba58 JA |
6875 | again: |
6876 | if (!list_empty(&ctx->iopoll_list)) { | |
6877 | unsigned nr_events = 0; | |
a4c0b3de | 6878 | |
c8d1ba58 JA |
6879 | mutex_lock(&ctx->uring_lock); |
6880 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) | |
6881 | io_do_iopoll(ctx, &nr_events, 0); | |
6882 | mutex_unlock(&ctx->uring_lock); | |
6883 | } | |
6c271ce2 | 6884 | |
c8d1ba58 | 6885 | to_submit = io_sqring_entries(ctx); |
6c271ce2 | 6886 | |
c8d1ba58 JA |
6887 | /* |
6888 | * If submit got -EBUSY, flag us as needing the application | |
6889 | * to enter the kernel to reap and flush events. | |
6890 | */ | |
6891 | if (!to_submit || ret == -EBUSY || need_resched()) { | |
6892 | /* | |
6893 | * Drop cur_mm before scheduling, we can't hold it for | |
6894 | * long periods (or over schedule()). Do this before | |
6895 | * adding ourselves to the waitqueue, as the unuse/drop | |
6896 | * may sleep. | |
6897 | */ | |
28cea78a | 6898 | io_sq_thread_drop_mm_files(); |
6c271ce2 | 6899 | |
c8d1ba58 JA |
6900 | /* |
6901 | * We're polling. If we're within the defined idle | |
6902 | * period, then let us spin without work before going | |
6903 | * to sleep. The exception is if we got EBUSY doing | |
6904 | * more IO, we should wait for the application to | |
6905 | * reap events and wake us up. | |
6906 | */ | |
6907 | if (!list_empty(&ctx->iopoll_list) || need_resched() || | |
6908 | (!time_after(jiffies, timeout) && ret != -EBUSY && | |
6909 | !percpu_ref_is_dying(&ctx->refs))) | |
6910 | return SQT_SPIN; | |
6c271ce2 | 6911 | |
534ca6d6 | 6912 | prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry, |
c8d1ba58 | 6913 | TASK_INTERRUPTIBLE); |
6c271ce2 | 6914 | |
c8d1ba58 JA |
6915 | /* |
6916 | * While doing polled IO, before going to sleep, we need | |
6917 | * to check if there are new reqs added to iopoll_list, | |
6918 | * it is because reqs may have been punted to io worker | |
6919 | * and will be added to iopoll_list later, hence check | |
6920 | * the iopoll_list again. | |
6921 | */ | |
6922 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6923 | !list_empty_careful(&ctx->iopoll_list)) { | |
534ca6d6 | 6924 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6925 | goto again; |
6c271ce2 JA |
6926 | } |
6927 | ||
fb5ccc98 | 6928 | to_submit = io_sqring_entries(ctx); |
c8d1ba58 JA |
6929 | if (!to_submit || ret == -EBUSY) |
6930 | return SQT_IDLE; | |
6931 | } | |
c1edbf5f | 6932 | |
534ca6d6 | 6933 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6934 | io_ring_clear_wakeup_flag(ctx); |
7143b5ac | 6935 | |
e95eee2d JA |
6936 | /* if we're handling multiple rings, cap submit size for fairness */ |
6937 | if (cap_entries && to_submit > 8) | |
6938 | to_submit = 8; | |
6939 | ||
c8d1ba58 JA |
6940 | mutex_lock(&ctx->uring_lock); |
6941 | if (likely(!percpu_ref_is_dying(&ctx->refs))) | |
6942 | ret = io_submit_sqes(ctx, to_submit); | |
6943 | mutex_unlock(&ctx->uring_lock); | |
90554200 JA |
6944 | |
6945 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6946 | wake_up(&ctx->sqo_sq_wait); | |
6947 | ||
c8d1ba58 JA |
6948 | return SQT_DID_WORK; |
6949 | } | |
6c271ce2 | 6950 | |
69fb2131 JA |
6951 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6952 | { | |
6953 | struct io_ring_ctx *ctx; | |
6954 | ||
6955 | while (!list_empty(&sqd->ctx_new_list)) { | |
6956 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
6957 | init_wait(&ctx->sqo_wait_entry); | |
6958 | ctx->sqo_wait_entry.func = io_sq_wake_function; | |
6959 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); | |
6960 | complete(&ctx->sq_thread_comp); | |
6961 | } | |
6962 | } | |
6963 | ||
c8d1ba58 JA |
6964 | static int io_sq_thread(void *data) |
6965 | { | |
91d8f519 | 6966 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
6967 | struct files_struct *old_files = current->files; |
6968 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
6969 | const struct cred *old_cred = NULL; |
6970 | struct io_sq_data *sqd = data; | |
6971 | struct io_ring_ctx *ctx; | |
c8d1ba58 | 6972 | unsigned long start_jiffies; |
6c271ce2 | 6973 | |
28cea78a JA |
6974 | task_lock(current); |
6975 | current->files = NULL; | |
6976 | current->nsproxy = NULL; | |
6977 | task_unlock(current); | |
6978 | ||
69fb2131 JA |
6979 | start_jiffies = jiffies; |
6980 | while (!kthread_should_stop()) { | |
6981 | enum sq_ret ret = 0; | |
e95eee2d | 6982 | bool cap_entries; |
c1edbf5f JA |
6983 | |
6984 | /* | |
69fb2131 JA |
6985 | * Any changes to the sqd lists are synchronized through the |
6986 | * kthread parking. This synchronizes the thread vs users, | |
6987 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 6988 | */ |
69fb2131 JA |
6989 | if (kthread_should_park()) |
6990 | kthread_parkme(); | |
7143b5ac | 6991 | |
69fb2131 JA |
6992 | if (unlikely(!list_empty(&sqd->ctx_new_list))) |
6993 | io_sqd_init_new(sqd); | |
6c271ce2 | 6994 | |
e95eee2d | 6995 | cap_entries = !list_is_singular(&sqd->ctx_list); |
6c271ce2 | 6996 | |
69fb2131 JA |
6997 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
6998 | if (current->cred != ctx->creds) { | |
6999 | if (old_cred) | |
7000 | revert_creds(old_cred); | |
7001 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7002 | } |
91d8f519 | 7003 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7004 | #ifdef CONFIG_AUDIT |
7005 | current->loginuid = ctx->loginuid; | |
7006 | current->sessionid = ctx->sessionid; | |
7007 | #endif | |
bdcd3eab | 7008 | |
e95eee2d | 7009 | ret |= __io_sq_thread(ctx, start_jiffies, cap_entries); |
6c271ce2 | 7010 | |
28cea78a | 7011 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7012 | } |
6c271ce2 | 7013 | |
69fb2131 | 7014 | if (ret & SQT_SPIN) { |
c8d1ba58 JA |
7015 | io_run_task_work(); |
7016 | cond_resched(); | |
69fb2131 JA |
7017 | } else if (ret == SQT_IDLE) { |
7018 | if (kthread_should_park()) | |
6c271ce2 | 7019 | continue; |
69fb2131 JA |
7020 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7021 | io_ring_set_wakeup_flag(ctx); | |
7022 | schedule(); | |
7023 | start_jiffies = jiffies; | |
7024 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
7025 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7026 | } |
6c271ce2 JA |
7027 | } |
7028 | ||
4c6e277c | 7029 | io_run_task_work(); |
b41e9852 | 7030 | |
91d8f519 DZ |
7031 | if (cur_css) |
7032 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7033 | if (old_cred) |
7034 | revert_creds(old_cred); | |
06058632 | 7035 | |
28cea78a JA |
7036 | task_lock(current); |
7037 | current->files = old_files; | |
7038 | current->nsproxy = old_nsproxy; | |
7039 | task_unlock(current); | |
7040 | ||
2bbcd6d3 | 7041 | kthread_parkme(); |
06058632 | 7042 | |
6c271ce2 JA |
7043 | return 0; |
7044 | } | |
7045 | ||
bda52162 JA |
7046 | struct io_wait_queue { |
7047 | struct wait_queue_entry wq; | |
7048 | struct io_ring_ctx *ctx; | |
7049 | unsigned to_wait; | |
7050 | unsigned nr_timeouts; | |
7051 | }; | |
7052 | ||
1d7bb1d5 | 7053 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
7054 | { |
7055 | struct io_ring_ctx *ctx = iowq->ctx; | |
7056 | ||
7057 | /* | |
d195a66e | 7058 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7059 | * started waiting. For timeouts, we always want to return to userspace, |
7060 | * regardless of event count. | |
7061 | */ | |
1d7bb1d5 | 7062 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
7063 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7064 | } | |
7065 | ||
7066 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7067 | int wake_flags, void *key) | |
7068 | { | |
7069 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7070 | wq); | |
7071 | ||
1d7bb1d5 JA |
7072 | /* use noflush == true, as we can't safely rely on locking context */ |
7073 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
7074 | return -1; |
7075 | ||
7076 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7077 | } | |
7078 | ||
af9c1a44 JA |
7079 | static int io_run_task_work_sig(void) |
7080 | { | |
7081 | if (io_run_task_work()) | |
7082 | return 1; | |
7083 | if (!signal_pending(current)) | |
7084 | return 0; | |
7085 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
7086 | spin_lock_irq(¤t->sighand->siglock); | |
7087 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
7088 | recalc_sigpending(); | |
7089 | spin_unlock_irq(¤t->sighand->siglock); | |
7090 | return 1; | |
7091 | } | |
7092 | return -EINTR; | |
7093 | } | |
7094 | ||
2b188cc1 JA |
7095 | /* |
7096 | * Wait until events become available, if we don't already have some. The | |
7097 | * application must reap them itself, as they reside on the shared cq ring. | |
7098 | */ | |
7099 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7100 | const sigset_t __user *sig, size_t sigsz, |
7101 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7102 | { |
bda52162 JA |
7103 | struct io_wait_queue iowq = { |
7104 | .wq = { | |
7105 | .private = current, | |
7106 | .func = io_wake_function, | |
7107 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7108 | }, | |
7109 | .ctx = ctx, | |
7110 | .to_wait = min_events, | |
7111 | }; | |
75b28aff | 7112 | struct io_rings *rings = ctx->rings; |
c73ebb68 HX |
7113 | struct timespec64 ts; |
7114 | signed long timeout = 0; | |
e9ffa5c2 | 7115 | int ret = 0; |
2b188cc1 | 7116 | |
b41e9852 JA |
7117 | do { |
7118 | if (io_cqring_events(ctx, false) >= min_events) | |
7119 | return 0; | |
4c6e277c | 7120 | if (!io_run_task_work()) |
b41e9852 | 7121 | break; |
b41e9852 | 7122 | } while (1); |
2b188cc1 JA |
7123 | |
7124 | if (sig) { | |
9e75ad5d AB |
7125 | #ifdef CONFIG_COMPAT |
7126 | if (in_compat_syscall()) | |
7127 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7128 | sigsz); |
9e75ad5d AB |
7129 | else |
7130 | #endif | |
b772434b | 7131 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7132 | |
2b188cc1 JA |
7133 | if (ret) |
7134 | return ret; | |
7135 | } | |
7136 | ||
c73ebb68 HX |
7137 | if (uts) { |
7138 | if (get_timespec64(&ts, uts)) | |
7139 | return -EFAULT; | |
7140 | timeout = timespec64_to_jiffies(&ts); | |
7141 | } | |
7142 | ||
bda52162 | 7143 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7144 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
7145 | do { |
7146 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
7147 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7148 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
7149 | ret = io_run_task_work_sig(); |
7150 | if (ret > 0) | |
4c6e277c | 7151 | continue; |
af9c1a44 | 7152 | else if (ret < 0) |
bda52162 | 7153 | break; |
ce593a6c JA |
7154 | if (io_should_wake(&iowq, false)) |
7155 | break; | |
c73ebb68 HX |
7156 | if (uts) { |
7157 | timeout = schedule_timeout(timeout); | |
7158 | if (timeout == 0) { | |
7159 | ret = -ETIME; | |
7160 | break; | |
7161 | } | |
7162 | } else { | |
7163 | schedule(); | |
7164 | } | |
bda52162 JA |
7165 | } while (1); |
7166 | finish_wait(&ctx->wait, &iowq.wq); | |
7167 | ||
b7db41c9 | 7168 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7169 | |
75b28aff | 7170 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7171 | } |
7172 | ||
6b06314c JA |
7173 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7174 | { | |
7175 | #if defined(CONFIG_UNIX) | |
7176 | if (ctx->ring_sock) { | |
7177 | struct sock *sock = ctx->ring_sock->sk; | |
7178 | struct sk_buff *skb; | |
7179 | ||
7180 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7181 | kfree_skb(skb); | |
7182 | } | |
7183 | #else | |
7184 | int i; | |
7185 | ||
65e19f54 JA |
7186 | for (i = 0; i < ctx->nr_user_files; i++) { |
7187 | struct file *file; | |
7188 | ||
7189 | file = io_file_from_index(ctx, i); | |
7190 | if (file) | |
7191 | fput(file); | |
7192 | } | |
6b06314c JA |
7193 | #endif |
7194 | } | |
7195 | ||
05f3fb3c JA |
7196 | static void io_file_ref_kill(struct percpu_ref *ref) |
7197 | { | |
7198 | struct fixed_file_data *data; | |
7199 | ||
7200 | data = container_of(ref, struct fixed_file_data, refs); | |
7201 | complete(&data->done); | |
7202 | } | |
7203 | ||
6b06314c JA |
7204 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7205 | { | |
05f3fb3c | 7206 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 7207 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
7208 | unsigned nr_tables, i; |
7209 | ||
05f3fb3c | 7210 | if (!data) |
6b06314c JA |
7211 | return -ENXIO; |
7212 | ||
6a4d07cd | 7213 | spin_lock(&data->lock); |
1e5d770b | 7214 | ref_node = data->node; |
6a4d07cd | 7215 | spin_unlock(&data->lock); |
05589553 XW |
7216 | if (ref_node) |
7217 | percpu_ref_kill(&ref_node->refs); | |
7218 | ||
7219 | percpu_ref_kill(&data->refs); | |
7220 | ||
7221 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7222 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 7223 | wait_for_completion(&data->done); |
05f3fb3c | 7224 | |
6b06314c | 7225 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7226 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7227 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7228 | kfree(data->table[i].files); |
7229 | kfree(data->table); | |
05589553 XW |
7230 | percpu_ref_exit(&data->refs); |
7231 | kfree(data); | |
05f3fb3c | 7232 | ctx->file_data = NULL; |
6b06314c JA |
7233 | ctx->nr_user_files = 0; |
7234 | return 0; | |
7235 | } | |
7236 | ||
534ca6d6 | 7237 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7238 | { |
534ca6d6 | 7239 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7240 | /* |
7241 | * The park is a bit of a work-around, without it we get | |
7242 | * warning spews on shutdown with SQPOLL set and affinity | |
7243 | * set to a single CPU. | |
7244 | */ | |
534ca6d6 JA |
7245 | if (sqd->thread) { |
7246 | kthread_park(sqd->thread); | |
7247 | kthread_stop(sqd->thread); | |
7248 | } | |
7249 | ||
7250 | kfree(sqd); | |
7251 | } | |
7252 | } | |
7253 | ||
aa06165d JA |
7254 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7255 | { | |
7256 | struct io_ring_ctx *ctx_attach; | |
7257 | struct io_sq_data *sqd; | |
7258 | struct fd f; | |
7259 | ||
7260 | f = fdget(p->wq_fd); | |
7261 | if (!f.file) | |
7262 | return ERR_PTR(-ENXIO); | |
7263 | if (f.file->f_op != &io_uring_fops) { | |
7264 | fdput(f); | |
7265 | return ERR_PTR(-EINVAL); | |
7266 | } | |
7267 | ||
7268 | ctx_attach = f.file->private_data; | |
7269 | sqd = ctx_attach->sq_data; | |
7270 | if (!sqd) { | |
7271 | fdput(f); | |
7272 | return ERR_PTR(-EINVAL); | |
7273 | } | |
7274 | ||
7275 | refcount_inc(&sqd->refs); | |
7276 | fdput(f); | |
7277 | return sqd; | |
7278 | } | |
7279 | ||
534ca6d6 JA |
7280 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7281 | { | |
7282 | struct io_sq_data *sqd; | |
7283 | ||
aa06165d JA |
7284 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7285 | return io_attach_sq_data(p); | |
7286 | ||
534ca6d6 JA |
7287 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7288 | if (!sqd) | |
7289 | return ERR_PTR(-ENOMEM); | |
7290 | ||
7291 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7292 | INIT_LIST_HEAD(&sqd->ctx_list); |
7293 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7294 | mutex_init(&sqd->ctx_lock); | |
7295 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7296 | init_waitqueue_head(&sqd->wait); |
7297 | return sqd; | |
7298 | } | |
7299 | ||
69fb2131 JA |
7300 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7301 | __releases(&sqd->lock) | |
7302 | { | |
7303 | if (!sqd->thread) | |
7304 | return; | |
7305 | kthread_unpark(sqd->thread); | |
7306 | mutex_unlock(&sqd->lock); | |
7307 | } | |
7308 | ||
7309 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7310 | __acquires(&sqd->lock) | |
7311 | { | |
7312 | if (!sqd->thread) | |
7313 | return; | |
7314 | mutex_lock(&sqd->lock); | |
7315 | kthread_park(sqd->thread); | |
7316 | } | |
7317 | ||
534ca6d6 JA |
7318 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7319 | { | |
7320 | struct io_sq_data *sqd = ctx->sq_data; | |
7321 | ||
7322 | if (sqd) { | |
7323 | if (sqd->thread) { | |
7324 | /* | |
7325 | * We may arrive here from the error branch in | |
7326 | * io_sq_offload_create() where the kthread is created | |
7327 | * without being waked up, thus wake it up now to make | |
7328 | * sure the wait will complete. | |
7329 | */ | |
7330 | wake_up_process(sqd->thread); | |
7331 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7332 | |
7333 | io_sq_thread_park(sqd); | |
7334 | } | |
7335 | ||
7336 | mutex_lock(&sqd->ctx_lock); | |
7337 | list_del(&ctx->sqd_list); | |
7338 | mutex_unlock(&sqd->ctx_lock); | |
7339 | ||
7340 | if (sqd->thread) { | |
7341 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); | |
7342 | io_sq_thread_unpark(sqd); | |
534ca6d6 JA |
7343 | } |
7344 | ||
7345 | io_put_sq_data(sqd); | |
7346 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7347 | } |
7348 | } | |
7349 | ||
6b06314c JA |
7350 | static void io_finish_async(struct io_ring_ctx *ctx) |
7351 | { | |
6c271ce2 JA |
7352 | io_sq_thread_stop(ctx); |
7353 | ||
561fb04a JA |
7354 | if (ctx->io_wq) { |
7355 | io_wq_destroy(ctx->io_wq); | |
7356 | ctx->io_wq = NULL; | |
6b06314c JA |
7357 | } |
7358 | } | |
7359 | ||
7360 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7361 | /* |
7362 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7363 | * the io_uring can be safely unregistered on process exit, even if we have | |
7364 | * loops in the file referencing. | |
7365 | */ | |
7366 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7367 | { | |
7368 | struct sock *sk = ctx->ring_sock->sk; | |
7369 | struct scm_fp_list *fpl; | |
7370 | struct sk_buff *skb; | |
08a45173 | 7371 | int i, nr_files; |
6b06314c | 7372 | |
6b06314c JA |
7373 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7374 | if (!fpl) | |
7375 | return -ENOMEM; | |
7376 | ||
7377 | skb = alloc_skb(0, GFP_KERNEL); | |
7378 | if (!skb) { | |
7379 | kfree(fpl); | |
7380 | return -ENOMEM; | |
7381 | } | |
7382 | ||
7383 | skb->sk = sk; | |
6b06314c | 7384 | |
08a45173 | 7385 | nr_files = 0; |
6b06314c JA |
7386 | fpl->user = get_uid(ctx->user); |
7387 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7388 | struct file *file = io_file_from_index(ctx, i + offset); |
7389 | ||
7390 | if (!file) | |
08a45173 | 7391 | continue; |
65e19f54 | 7392 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7393 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7394 | nr_files++; | |
6b06314c JA |
7395 | } |
7396 | ||
08a45173 JA |
7397 | if (nr_files) { |
7398 | fpl->max = SCM_MAX_FD; | |
7399 | fpl->count = nr_files; | |
7400 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7401 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7402 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7403 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7404 | |
08a45173 JA |
7405 | for (i = 0; i < nr_files; i++) |
7406 | fput(fpl->fp[i]); | |
7407 | } else { | |
7408 | kfree_skb(skb); | |
7409 | kfree(fpl); | |
7410 | } | |
6b06314c JA |
7411 | |
7412 | return 0; | |
7413 | } | |
7414 | ||
7415 | /* | |
7416 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7417 | * causes regular reference counting to break down. We rely on the UNIX | |
7418 | * garbage collection to take care of this problem for us. | |
7419 | */ | |
7420 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7421 | { | |
7422 | unsigned left, total; | |
7423 | int ret = 0; | |
7424 | ||
7425 | total = 0; | |
7426 | left = ctx->nr_user_files; | |
7427 | while (left) { | |
7428 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7429 | |
7430 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7431 | if (ret) | |
7432 | break; | |
7433 | left -= this_files; | |
7434 | total += this_files; | |
7435 | } | |
7436 | ||
7437 | if (!ret) | |
7438 | return 0; | |
7439 | ||
7440 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7441 | struct file *file = io_file_from_index(ctx, total); |
7442 | ||
7443 | if (file) | |
7444 | fput(file); | |
6b06314c JA |
7445 | total++; |
7446 | } | |
7447 | ||
7448 | return ret; | |
7449 | } | |
7450 | #else | |
7451 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7452 | { | |
7453 | return 0; | |
7454 | } | |
7455 | #endif | |
7456 | ||
5398ae69 PB |
7457 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7458 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7459 | { |
7460 | int i; | |
7461 | ||
7462 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7463 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7464 | unsigned this_files; |
7465 | ||
7466 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7467 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7468 | GFP_KERNEL); | |
7469 | if (!table->files) | |
7470 | break; | |
7471 | nr_files -= this_files; | |
7472 | } | |
7473 | ||
7474 | if (i == nr_tables) | |
7475 | return 0; | |
7476 | ||
7477 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7478 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7479 | kfree(table->files); |
7480 | } | |
7481 | return 1; | |
7482 | } | |
7483 | ||
05f3fb3c JA |
7484 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7485 | { | |
7486 | #if defined(CONFIG_UNIX) | |
7487 | struct sock *sock = ctx->ring_sock->sk; | |
7488 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7489 | struct sk_buff *skb; | |
7490 | int i; | |
7491 | ||
7492 | __skb_queue_head_init(&list); | |
7493 | ||
7494 | /* | |
7495 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7496 | * remove this entry and rearrange the file array. | |
7497 | */ | |
7498 | skb = skb_dequeue(head); | |
7499 | while (skb) { | |
7500 | struct scm_fp_list *fp; | |
7501 | ||
7502 | fp = UNIXCB(skb).fp; | |
7503 | for (i = 0; i < fp->count; i++) { | |
7504 | int left; | |
7505 | ||
7506 | if (fp->fp[i] != file) | |
7507 | continue; | |
7508 | ||
7509 | unix_notinflight(fp->user, fp->fp[i]); | |
7510 | left = fp->count - 1 - i; | |
7511 | if (left) { | |
7512 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7513 | left * sizeof(struct file *)); | |
7514 | } | |
7515 | fp->count--; | |
7516 | if (!fp->count) { | |
7517 | kfree_skb(skb); | |
7518 | skb = NULL; | |
7519 | } else { | |
7520 | __skb_queue_tail(&list, skb); | |
7521 | } | |
7522 | fput(file); | |
7523 | file = NULL; | |
7524 | break; | |
7525 | } | |
7526 | ||
7527 | if (!file) | |
7528 | break; | |
7529 | ||
7530 | __skb_queue_tail(&list, skb); | |
7531 | ||
7532 | skb = skb_dequeue(head); | |
7533 | } | |
7534 | ||
7535 | if (skb_peek(&list)) { | |
7536 | spin_lock_irq(&head->lock); | |
7537 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7538 | __skb_queue_tail(head, skb); | |
7539 | spin_unlock_irq(&head->lock); | |
7540 | } | |
7541 | #else | |
7542 | fput(file); | |
7543 | #endif | |
7544 | } | |
7545 | ||
7546 | struct io_file_put { | |
05589553 | 7547 | struct list_head list; |
05f3fb3c | 7548 | struct file *file; |
05f3fb3c JA |
7549 | }; |
7550 | ||
4a38aed2 | 7551 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7552 | { |
4a38aed2 JA |
7553 | struct fixed_file_data *file_data = ref_node->file_data; |
7554 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7555 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7556 | |
7557 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7558 | list_del(&pfile->list); |
05589553 XW |
7559 | io_ring_file_put(ctx, pfile->file); |
7560 | kfree(pfile); | |
65e19f54 | 7561 | } |
05589553 | 7562 | |
05589553 XW |
7563 | percpu_ref_exit(&ref_node->refs); |
7564 | kfree(ref_node); | |
7565 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7566 | } |
65e19f54 | 7567 | |
4a38aed2 JA |
7568 | static void io_file_put_work(struct work_struct *work) |
7569 | { | |
7570 | struct io_ring_ctx *ctx; | |
7571 | struct llist_node *node; | |
7572 | ||
7573 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7574 | node = llist_del_all(&ctx->file_put_llist); | |
7575 | ||
7576 | while (node) { | |
7577 | struct fixed_file_ref_node *ref_node; | |
7578 | struct llist_node *next = node->next; | |
7579 | ||
7580 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7581 | __io_file_put_work(ref_node); | |
7582 | node = next; | |
7583 | } | |
7584 | } | |
7585 | ||
05589553 | 7586 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7587 | { |
05589553 | 7588 | struct fixed_file_ref_node *ref_node; |
e297822b | 7589 | struct fixed_file_data *data; |
4a38aed2 | 7590 | struct io_ring_ctx *ctx; |
e297822b | 7591 | bool first_add = false; |
4a38aed2 | 7592 | int delay = HZ; |
65e19f54 | 7593 | |
05589553 | 7594 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7595 | data = ref_node->file_data; |
7596 | ctx = data->ctx; | |
7597 | ||
7598 | spin_lock(&data->lock); | |
7599 | ref_node->done = true; | |
7600 | ||
7601 | while (!list_empty(&data->ref_list)) { | |
7602 | ref_node = list_first_entry(&data->ref_list, | |
7603 | struct fixed_file_ref_node, node); | |
7604 | /* recycle ref nodes in order */ | |
7605 | if (!ref_node->done) | |
7606 | break; | |
7607 | list_del(&ref_node->node); | |
7608 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7609 | } | |
7610 | spin_unlock(&data->lock); | |
05589553 | 7611 | |
e297822b | 7612 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7613 | delay = 0; |
05589553 | 7614 | |
4a38aed2 JA |
7615 | if (!delay) |
7616 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7617 | else if (first_add) | |
7618 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7619 | } |
65e19f54 | 7620 | |
05589553 XW |
7621 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7622 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7623 | { |
05589553 | 7624 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7625 | |
05589553 XW |
7626 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7627 | if (!ref_node) | |
7628 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7629 | |
05589553 XW |
7630 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7631 | 0, GFP_KERNEL)) { | |
7632 | kfree(ref_node); | |
7633 | return ERR_PTR(-ENOMEM); | |
7634 | } | |
7635 | INIT_LIST_HEAD(&ref_node->node); | |
7636 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7637 | ref_node->file_data = ctx->file_data; |
e297822b | 7638 | ref_node->done = false; |
05589553 | 7639 | return ref_node; |
05589553 XW |
7640 | } |
7641 | ||
7642 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7643 | { | |
7644 | percpu_ref_exit(&ref_node->refs); | |
7645 | kfree(ref_node); | |
65e19f54 JA |
7646 | } |
7647 | ||
6b06314c JA |
7648 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7649 | unsigned nr_args) | |
7650 | { | |
7651 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7652 | unsigned nr_tables, i; |
05f3fb3c | 7653 | struct file *file; |
600cf3f8 | 7654 | int fd, ret = -ENOMEM; |
05589553 | 7655 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7656 | struct fixed_file_data *file_data; |
6b06314c | 7657 | |
05f3fb3c | 7658 | if (ctx->file_data) |
6b06314c JA |
7659 | return -EBUSY; |
7660 | if (!nr_args) | |
7661 | return -EINVAL; | |
7662 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7663 | return -EMFILE; | |
7664 | ||
5398ae69 PB |
7665 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7666 | if (!file_data) | |
05f3fb3c | 7667 | return -ENOMEM; |
5398ae69 PB |
7668 | file_data->ctx = ctx; |
7669 | init_completion(&file_data->done); | |
7670 | INIT_LIST_HEAD(&file_data->ref_list); | |
7671 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7672 | |
65e19f54 | 7673 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7674 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7675 | GFP_KERNEL); |
600cf3f8 PB |
7676 | if (!file_data->table) |
7677 | goto out_free; | |
05f3fb3c | 7678 | |
5398ae69 | 7679 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7680 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7681 | goto out_free; | |
6b06314c | 7682 | |
600cf3f8 PB |
7683 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7684 | goto out_ref; | |
55cbc256 | 7685 | ctx->file_data = file_data; |
65e19f54 | 7686 | |
08a45173 | 7687 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7688 | struct fixed_file_table *table; |
7689 | unsigned index; | |
7690 | ||
600cf3f8 PB |
7691 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7692 | ret = -EFAULT; | |
7693 | goto out_fput; | |
7694 | } | |
08a45173 | 7695 | /* allow sparse sets */ |
600cf3f8 | 7696 | if (fd == -1) |
08a45173 | 7697 | continue; |
6b06314c | 7698 | |
05f3fb3c | 7699 | file = fget(fd); |
6b06314c | 7700 | ret = -EBADF; |
05f3fb3c | 7701 | if (!file) |
600cf3f8 | 7702 | goto out_fput; |
05f3fb3c | 7703 | |
6b06314c JA |
7704 | /* |
7705 | * Don't allow io_uring instances to be registered. If UNIX | |
7706 | * isn't enabled, then this causes a reference cycle and this | |
7707 | * instance can never get freed. If UNIX is enabled we'll | |
7708 | * handle it just fine, but there's still no point in allowing | |
7709 | * a ring fd as it doesn't support regular read/write anyway. | |
7710 | */ | |
05f3fb3c JA |
7711 | if (file->f_op == &io_uring_fops) { |
7712 | fput(file); | |
600cf3f8 | 7713 | goto out_fput; |
6b06314c | 7714 | } |
600cf3f8 PB |
7715 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7716 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7717 | table->files[index] = file; |
6b06314c JA |
7718 | } |
7719 | ||
6b06314c | 7720 | ret = io_sqe_files_scm(ctx); |
05589553 | 7721 | if (ret) { |
6b06314c | 7722 | io_sqe_files_unregister(ctx); |
05589553 XW |
7723 | return ret; |
7724 | } | |
6b06314c | 7725 | |
05589553 XW |
7726 | ref_node = alloc_fixed_file_ref_node(ctx); |
7727 | if (IS_ERR(ref_node)) { | |
7728 | io_sqe_files_unregister(ctx); | |
7729 | return PTR_ERR(ref_node); | |
7730 | } | |
7731 | ||
b2e96852 | 7732 | file_data->node = ref_node; |
5398ae69 | 7733 | spin_lock(&file_data->lock); |
e297822b | 7734 | list_add_tail(&ref_node->node, &file_data->ref_list); |
5398ae69 PB |
7735 | spin_unlock(&file_data->lock); |
7736 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7737 | return ret; |
600cf3f8 PB |
7738 | out_fput: |
7739 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7740 | file = io_file_from_index(ctx, i); | |
7741 | if (file) | |
7742 | fput(file); | |
7743 | } | |
7744 | for (i = 0; i < nr_tables; i++) | |
7745 | kfree(file_data->table[i].files); | |
7746 | ctx->nr_user_files = 0; | |
7747 | out_ref: | |
7748 | percpu_ref_exit(&file_data->refs); | |
7749 | out_free: | |
7750 | kfree(file_data->table); | |
7751 | kfree(file_data); | |
55cbc256 | 7752 | ctx->file_data = NULL; |
6b06314c JA |
7753 | return ret; |
7754 | } | |
7755 | ||
c3a31e60 JA |
7756 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7757 | int index) | |
7758 | { | |
7759 | #if defined(CONFIG_UNIX) | |
7760 | struct sock *sock = ctx->ring_sock->sk; | |
7761 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7762 | struct sk_buff *skb; | |
7763 | ||
7764 | /* | |
7765 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7766 | * file set. If there's no room, fall back to allocating a new skb | |
7767 | * and filling it in. | |
7768 | */ | |
7769 | spin_lock_irq(&head->lock); | |
7770 | skb = skb_peek(head); | |
7771 | if (skb) { | |
7772 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7773 | ||
7774 | if (fpl->count < SCM_MAX_FD) { | |
7775 | __skb_unlink(skb, head); | |
7776 | spin_unlock_irq(&head->lock); | |
7777 | fpl->fp[fpl->count] = get_file(file); | |
7778 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7779 | fpl->count++; | |
7780 | spin_lock_irq(&head->lock); | |
7781 | __skb_queue_head(head, skb); | |
7782 | } else { | |
7783 | skb = NULL; | |
7784 | } | |
7785 | } | |
7786 | spin_unlock_irq(&head->lock); | |
7787 | ||
7788 | if (skb) { | |
7789 | fput(file); | |
7790 | return 0; | |
7791 | } | |
7792 | ||
7793 | return __io_sqe_files_scm(ctx, 1, index); | |
7794 | #else | |
7795 | return 0; | |
7796 | #endif | |
7797 | } | |
7798 | ||
a5318d3c | 7799 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7800 | struct file *file) |
05f3fb3c | 7801 | { |
a5318d3c | 7802 | struct io_file_put *pfile; |
b2e96852 | 7803 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7804 | |
05f3fb3c | 7805 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7806 | if (!pfile) |
7807 | return -ENOMEM; | |
05f3fb3c JA |
7808 | |
7809 | pfile->file = file; | |
05589553 XW |
7810 | list_add(&pfile->list, &ref_node->file_list); |
7811 | ||
a5318d3c | 7812 | return 0; |
05f3fb3c JA |
7813 | } |
7814 | ||
7815 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7816 | struct io_uring_files_update *up, | |
7817 | unsigned nr_args) | |
7818 | { | |
7819 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7820 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7821 | struct file *file; |
c3a31e60 JA |
7822 | __s32 __user *fds; |
7823 | int fd, i, err; | |
7824 | __u32 done; | |
05589553 | 7825 | bool needs_switch = false; |
c3a31e60 | 7826 | |
05f3fb3c | 7827 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7828 | return -EOVERFLOW; |
7829 | if (done > ctx->nr_user_files) | |
7830 | return -EINVAL; | |
7831 | ||
05589553 XW |
7832 | ref_node = alloc_fixed_file_ref_node(ctx); |
7833 | if (IS_ERR(ref_node)) | |
7834 | return PTR_ERR(ref_node); | |
7835 | ||
c3a31e60 | 7836 | done = 0; |
05f3fb3c | 7837 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7838 | while (nr_args) { |
65e19f54 JA |
7839 | struct fixed_file_table *table; |
7840 | unsigned index; | |
7841 | ||
c3a31e60 JA |
7842 | err = 0; |
7843 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7844 | err = -EFAULT; | |
7845 | break; | |
7846 | } | |
05f3fb3c JA |
7847 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7848 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7849 | index = i & IORING_FILE_TABLE_MASK; |
7850 | if (table->files[index]) { | |
98dfd502 | 7851 | file = table->files[index]; |
a5318d3c HD |
7852 | err = io_queue_file_removal(data, file); |
7853 | if (err) | |
7854 | break; | |
65e19f54 | 7855 | table->files[index] = NULL; |
05589553 | 7856 | needs_switch = true; |
c3a31e60 JA |
7857 | } |
7858 | if (fd != -1) { | |
c3a31e60 JA |
7859 | file = fget(fd); |
7860 | if (!file) { | |
7861 | err = -EBADF; | |
7862 | break; | |
7863 | } | |
7864 | /* | |
7865 | * Don't allow io_uring instances to be registered. If | |
7866 | * UNIX isn't enabled, then this causes a reference | |
7867 | * cycle and this instance can never get freed. If UNIX | |
7868 | * is enabled we'll handle it just fine, but there's | |
7869 | * still no point in allowing a ring fd as it doesn't | |
7870 | * support regular read/write anyway. | |
7871 | */ | |
7872 | if (file->f_op == &io_uring_fops) { | |
7873 | fput(file); | |
7874 | err = -EBADF; | |
7875 | break; | |
7876 | } | |
65e19f54 | 7877 | table->files[index] = file; |
c3a31e60 | 7878 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7879 | if (err) { |
95d1c8e5 | 7880 | table->files[index] = NULL; |
f3bd9dae | 7881 | fput(file); |
c3a31e60 | 7882 | break; |
f3bd9dae | 7883 | } |
c3a31e60 JA |
7884 | } |
7885 | nr_args--; | |
7886 | done++; | |
05f3fb3c JA |
7887 | up->offset++; |
7888 | } | |
7889 | ||
05589553 | 7890 | if (needs_switch) { |
b2e96852 | 7891 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7892 | spin_lock(&data->lock); |
e297822b | 7893 | list_add_tail(&ref_node->node, &data->ref_list); |
b2e96852 | 7894 | data->node = ref_node; |
6a4d07cd | 7895 | spin_unlock(&data->lock); |
05589553 XW |
7896 | percpu_ref_get(&ctx->file_data->refs); |
7897 | } else | |
7898 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7899 | |
7900 | return done ? done : err; | |
7901 | } | |
05589553 | 7902 | |
05f3fb3c JA |
7903 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7904 | unsigned nr_args) | |
7905 | { | |
7906 | struct io_uring_files_update up; | |
7907 | ||
7908 | if (!ctx->file_data) | |
7909 | return -ENXIO; | |
7910 | if (!nr_args) | |
7911 | return -EINVAL; | |
7912 | if (copy_from_user(&up, arg, sizeof(up))) | |
7913 | return -EFAULT; | |
7914 | if (up.resv) | |
7915 | return -EINVAL; | |
7916 | ||
7917 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7918 | } | |
c3a31e60 | 7919 | |
e9fd9396 | 7920 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7921 | { |
7922 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7923 | ||
e9fd9396 | 7924 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7925 | io_put_req(req); |
7926 | } | |
7927 | ||
24369c2e PB |
7928 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7929 | struct io_uring_params *p) | |
7930 | { | |
7931 | struct io_wq_data data; | |
7932 | struct fd f; | |
7933 | struct io_ring_ctx *ctx_attach; | |
7934 | unsigned int concurrency; | |
7935 | int ret = 0; | |
7936 | ||
7937 | data.user = ctx->user; | |
e9fd9396 | 7938 | data.free_work = io_free_work; |
f5fa38c5 | 7939 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7940 | |
7941 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7942 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7943 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7944 | ||
7945 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7946 | if (IS_ERR(ctx->io_wq)) { | |
7947 | ret = PTR_ERR(ctx->io_wq); | |
7948 | ctx->io_wq = NULL; | |
7949 | } | |
7950 | return ret; | |
7951 | } | |
7952 | ||
7953 | f = fdget(p->wq_fd); | |
7954 | if (!f.file) | |
7955 | return -EBADF; | |
7956 | ||
7957 | if (f.file->f_op != &io_uring_fops) { | |
7958 | ret = -EINVAL; | |
7959 | goto out_fput; | |
7960 | } | |
7961 | ||
7962 | ctx_attach = f.file->private_data; | |
7963 | /* @io_wq is protected by holding the fd */ | |
7964 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7965 | ret = -EINVAL; | |
7966 | goto out_fput; | |
7967 | } | |
7968 | ||
7969 | ctx->io_wq = ctx_attach->io_wq; | |
7970 | out_fput: | |
7971 | fdput(f); | |
7972 | return ret; | |
7973 | } | |
7974 | ||
0f212204 JA |
7975 | static int io_uring_alloc_task_context(struct task_struct *task) |
7976 | { | |
7977 | struct io_uring_task *tctx; | |
d8a6df10 | 7978 | int ret; |
0f212204 JA |
7979 | |
7980 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7981 | if (unlikely(!tctx)) | |
7982 | return -ENOMEM; | |
7983 | ||
d8a6df10 JA |
7984 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7985 | if (unlikely(ret)) { | |
7986 | kfree(tctx); | |
7987 | return ret; | |
7988 | } | |
7989 | ||
0f212204 JA |
7990 | xa_init(&tctx->xa); |
7991 | init_waitqueue_head(&tctx->wait); | |
7992 | tctx->last = NULL; | |
fdaf083c JA |
7993 | atomic_set(&tctx->in_idle, 0); |
7994 | tctx->sqpoll = false; | |
500a373d JA |
7995 | io_init_identity(&tctx->__identity); |
7996 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7997 | task->io_uring = tctx; |
7998 | return 0; | |
7999 | } | |
8000 | ||
8001 | void __io_uring_free(struct task_struct *tsk) | |
8002 | { | |
8003 | struct io_uring_task *tctx = tsk->io_uring; | |
8004 | ||
8005 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8006 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8007 | if (tctx->identity != &tctx->__identity) | |
8008 | kfree(tctx->identity); | |
d8a6df10 | 8009 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8010 | kfree(tctx); |
8011 | tsk->io_uring = NULL; | |
8012 | } | |
8013 | ||
7e84e1c7 SG |
8014 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8015 | struct io_uring_params *p) | |
2b188cc1 JA |
8016 | { |
8017 | int ret; | |
8018 | ||
6c271ce2 | 8019 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8020 | struct io_sq_data *sqd; |
8021 | ||
3ec482d1 | 8022 | ret = -EPERM; |
ce59fc69 | 8023 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8024 | goto err; |
8025 | ||
534ca6d6 JA |
8026 | sqd = io_get_sq_data(p); |
8027 | if (IS_ERR(sqd)) { | |
8028 | ret = PTR_ERR(sqd); | |
8029 | goto err; | |
8030 | } | |
69fb2131 | 8031 | |
534ca6d6 | 8032 | ctx->sq_data = sqd; |
69fb2131 JA |
8033 | io_sq_thread_park(sqd); |
8034 | mutex_lock(&sqd->ctx_lock); | |
8035 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8036 | mutex_unlock(&sqd->ctx_lock); | |
8037 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8038 | |
917257da JA |
8039 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8040 | if (!ctx->sq_thread_idle) | |
8041 | ctx->sq_thread_idle = HZ; | |
8042 | ||
aa06165d JA |
8043 | if (sqd->thread) |
8044 | goto done; | |
8045 | ||
6c271ce2 | 8046 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8047 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8048 | |
917257da | 8049 | ret = -EINVAL; |
44a9bd18 JA |
8050 | if (cpu >= nr_cpu_ids) |
8051 | goto err; | |
7889f44d | 8052 | if (!cpu_online(cpu)) |
917257da JA |
8053 | goto err; |
8054 | ||
69fb2131 | 8055 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8056 | cpu, "io_uring-sq"); |
6c271ce2 | 8057 | } else { |
69fb2131 | 8058 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8059 | "io_uring-sq"); |
8060 | } | |
534ca6d6 JA |
8061 | if (IS_ERR(sqd->thread)) { |
8062 | ret = PTR_ERR(sqd->thread); | |
8063 | sqd->thread = NULL; | |
6c271ce2 JA |
8064 | goto err; |
8065 | } | |
534ca6d6 | 8066 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8067 | if (ret) |
8068 | goto err; | |
6c271ce2 JA |
8069 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8070 | /* Can't have SQ_AFF without SQPOLL */ | |
8071 | ret = -EINVAL; | |
8072 | goto err; | |
8073 | } | |
8074 | ||
aa06165d | 8075 | done: |
24369c2e PB |
8076 | ret = io_init_wq_offload(ctx, p); |
8077 | if (ret) | |
2b188cc1 | 8078 | goto err; |
2b188cc1 JA |
8079 | |
8080 | return 0; | |
8081 | err: | |
54a91f3b | 8082 | io_finish_async(ctx); |
2b188cc1 JA |
8083 | return ret; |
8084 | } | |
8085 | ||
7e84e1c7 SG |
8086 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8087 | { | |
534ca6d6 JA |
8088 | struct io_sq_data *sqd = ctx->sq_data; |
8089 | ||
8090 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8091 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8092 | } |
8093 | ||
a087e2b5 BM |
8094 | static inline void __io_unaccount_mem(struct user_struct *user, |
8095 | unsigned long nr_pages) | |
2b188cc1 JA |
8096 | { |
8097 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8098 | } | |
8099 | ||
a087e2b5 BM |
8100 | static inline int __io_account_mem(struct user_struct *user, |
8101 | unsigned long nr_pages) | |
2b188cc1 JA |
8102 | { |
8103 | unsigned long page_limit, cur_pages, new_pages; | |
8104 | ||
8105 | /* Don't allow more pages than we can safely lock */ | |
8106 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8107 | ||
8108 | do { | |
8109 | cur_pages = atomic_long_read(&user->locked_vm); | |
8110 | new_pages = cur_pages + nr_pages; | |
8111 | if (new_pages > page_limit) | |
8112 | return -ENOMEM; | |
8113 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8114 | new_pages) != cur_pages); | |
8115 | ||
8116 | return 0; | |
8117 | } | |
8118 | ||
2e0464d4 BM |
8119 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8120 | enum io_mem_account acct) | |
a087e2b5 | 8121 | { |
aad5d8da | 8122 | if (ctx->limit_mem) |
a087e2b5 | 8123 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8124 | |
2aede0e4 | 8125 | if (ctx->mm_account) { |
2e0464d4 | 8126 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8127 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 8128 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8129 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8130 | } |
a087e2b5 BM |
8131 | } |
8132 | ||
2e0464d4 BM |
8133 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8134 | enum io_mem_account acct) | |
a087e2b5 | 8135 | { |
30975825 BM |
8136 | int ret; |
8137 | ||
8138 | if (ctx->limit_mem) { | |
8139 | ret = __io_account_mem(ctx->user, nr_pages); | |
8140 | if (ret) | |
8141 | return ret; | |
8142 | } | |
8143 | ||
2aede0e4 | 8144 | if (ctx->mm_account) { |
2e0464d4 | 8145 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8146 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 8147 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8148 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8149 | } |
a087e2b5 BM |
8150 | |
8151 | return 0; | |
8152 | } | |
8153 | ||
2b188cc1 JA |
8154 | static void io_mem_free(void *ptr) |
8155 | { | |
52e04ef4 MR |
8156 | struct page *page; |
8157 | ||
8158 | if (!ptr) | |
8159 | return; | |
2b188cc1 | 8160 | |
52e04ef4 | 8161 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8162 | if (put_page_testzero(page)) |
8163 | free_compound_page(page); | |
8164 | } | |
8165 | ||
8166 | static void *io_mem_alloc(size_t size) | |
8167 | { | |
8168 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8169 | __GFP_NORETRY; | |
8170 | ||
8171 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8172 | } | |
8173 | ||
75b28aff HV |
8174 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8175 | size_t *sq_offset) | |
8176 | { | |
8177 | struct io_rings *rings; | |
8178 | size_t off, sq_array_size; | |
8179 | ||
8180 | off = struct_size(rings, cqes, cq_entries); | |
8181 | if (off == SIZE_MAX) | |
8182 | return SIZE_MAX; | |
8183 | ||
8184 | #ifdef CONFIG_SMP | |
8185 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8186 | if (off == 0) | |
8187 | return SIZE_MAX; | |
8188 | #endif | |
8189 | ||
b36200f5 DV |
8190 | if (sq_offset) |
8191 | *sq_offset = off; | |
8192 | ||
75b28aff HV |
8193 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8194 | if (sq_array_size == SIZE_MAX) | |
8195 | return SIZE_MAX; | |
8196 | ||
8197 | if (check_add_overflow(off, sq_array_size, &off)) | |
8198 | return SIZE_MAX; | |
8199 | ||
75b28aff HV |
8200 | return off; |
8201 | } | |
8202 | ||
2b188cc1 JA |
8203 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8204 | { | |
75b28aff | 8205 | size_t pages; |
2b188cc1 | 8206 | |
75b28aff HV |
8207 | pages = (size_t)1 << get_order( |
8208 | rings_size(sq_entries, cq_entries, NULL)); | |
8209 | pages += (size_t)1 << get_order( | |
8210 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8211 | |
75b28aff | 8212 | return pages; |
2b188cc1 JA |
8213 | } |
8214 | ||
edafccee JA |
8215 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
8216 | { | |
8217 | int i, j; | |
8218 | ||
8219 | if (!ctx->user_bufs) | |
8220 | return -ENXIO; | |
8221 | ||
8222 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8223 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8224 | ||
8225 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8226 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8227 | |
de293938 JA |
8228 | if (imu->acct_pages) |
8229 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8230 | kvfree(imu->bvec); |
edafccee JA |
8231 | imu->nr_bvecs = 0; |
8232 | } | |
8233 | ||
8234 | kfree(ctx->user_bufs); | |
8235 | ctx->user_bufs = NULL; | |
8236 | ctx->nr_user_bufs = 0; | |
8237 | return 0; | |
8238 | } | |
8239 | ||
8240 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8241 | void __user *arg, unsigned index) | |
8242 | { | |
8243 | struct iovec __user *src; | |
8244 | ||
8245 | #ifdef CONFIG_COMPAT | |
8246 | if (ctx->compat) { | |
8247 | struct compat_iovec __user *ciovs; | |
8248 | struct compat_iovec ciov; | |
8249 | ||
8250 | ciovs = (struct compat_iovec __user *) arg; | |
8251 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8252 | return -EFAULT; | |
8253 | ||
d55e5f5b | 8254 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8255 | dst->iov_len = ciov.iov_len; |
8256 | return 0; | |
8257 | } | |
8258 | #endif | |
8259 | src = (struct iovec __user *) arg; | |
8260 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8261 | return -EFAULT; | |
8262 | return 0; | |
8263 | } | |
8264 | ||
de293938 JA |
8265 | /* |
8266 | * Not super efficient, but this is just a registration time. And we do cache | |
8267 | * the last compound head, so generally we'll only do a full search if we don't | |
8268 | * match that one. | |
8269 | * | |
8270 | * We check if the given compound head page has already been accounted, to | |
8271 | * avoid double accounting it. This allows us to account the full size of the | |
8272 | * page, not just the constituent pages of a huge page. | |
8273 | */ | |
8274 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8275 | int nr_pages, struct page *hpage) | |
8276 | { | |
8277 | int i, j; | |
8278 | ||
8279 | /* check current page array */ | |
8280 | for (i = 0; i < nr_pages; i++) { | |
8281 | if (!PageCompound(pages[i])) | |
8282 | continue; | |
8283 | if (compound_head(pages[i]) == hpage) | |
8284 | return true; | |
8285 | } | |
8286 | ||
8287 | /* check previously registered pages */ | |
8288 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8289 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8290 | ||
8291 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8292 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8293 | continue; | |
8294 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8295 | return true; | |
8296 | } | |
8297 | } | |
8298 | ||
8299 | return false; | |
8300 | } | |
8301 | ||
8302 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8303 | int nr_pages, struct io_mapped_ubuf *imu, | |
8304 | struct page **last_hpage) | |
8305 | { | |
8306 | int i, ret; | |
8307 | ||
8308 | for (i = 0; i < nr_pages; i++) { | |
8309 | if (!PageCompound(pages[i])) { | |
8310 | imu->acct_pages++; | |
8311 | } else { | |
8312 | struct page *hpage; | |
8313 | ||
8314 | hpage = compound_head(pages[i]); | |
8315 | if (hpage == *last_hpage) | |
8316 | continue; | |
8317 | *last_hpage = hpage; | |
8318 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8319 | continue; | |
8320 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8321 | } | |
8322 | } | |
8323 | ||
8324 | if (!imu->acct_pages) | |
8325 | return 0; | |
8326 | ||
8327 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8328 | if (ret) | |
8329 | imu->acct_pages = 0; | |
8330 | return ret; | |
8331 | } | |
8332 | ||
edafccee JA |
8333 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8334 | unsigned nr_args) | |
8335 | { | |
8336 | struct vm_area_struct **vmas = NULL; | |
8337 | struct page **pages = NULL; | |
de293938 | 8338 | struct page *last_hpage = NULL; |
edafccee JA |
8339 | int i, j, got_pages = 0; |
8340 | int ret = -EINVAL; | |
8341 | ||
8342 | if (ctx->user_bufs) | |
8343 | return -EBUSY; | |
8344 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8345 | return -EINVAL; | |
8346 | ||
8347 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8348 | GFP_KERNEL); | |
8349 | if (!ctx->user_bufs) | |
8350 | return -ENOMEM; | |
8351 | ||
8352 | for (i = 0; i < nr_args; i++) { | |
8353 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8354 | unsigned long off, start, end, ubuf; | |
8355 | int pret, nr_pages; | |
8356 | struct iovec iov; | |
8357 | size_t size; | |
8358 | ||
8359 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8360 | if (ret) | |
a278682d | 8361 | goto err; |
edafccee JA |
8362 | |
8363 | /* | |
8364 | * Don't impose further limits on the size and buffer | |
8365 | * constraints here, we'll -EINVAL later when IO is | |
8366 | * submitted if they are wrong. | |
8367 | */ | |
8368 | ret = -EFAULT; | |
8369 | if (!iov.iov_base || !iov.iov_len) | |
8370 | goto err; | |
8371 | ||
8372 | /* arbitrary limit, but we need something */ | |
8373 | if (iov.iov_len > SZ_1G) | |
8374 | goto err; | |
8375 | ||
8376 | ubuf = (unsigned long) iov.iov_base; | |
8377 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8378 | start = ubuf >> PAGE_SHIFT; | |
8379 | nr_pages = end - start; | |
8380 | ||
edafccee JA |
8381 | ret = 0; |
8382 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8383 | kvfree(vmas); |
8384 | kvfree(pages); | |
d4ef6475 | 8385 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8386 | GFP_KERNEL); |
d4ef6475 | 8387 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8388 | sizeof(struct vm_area_struct *), |
8389 | GFP_KERNEL); | |
8390 | if (!pages || !vmas) { | |
8391 | ret = -ENOMEM; | |
edafccee JA |
8392 | goto err; |
8393 | } | |
8394 | got_pages = nr_pages; | |
8395 | } | |
8396 | ||
d4ef6475 | 8397 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8398 | GFP_KERNEL); |
8399 | ret = -ENOMEM; | |
de293938 | 8400 | if (!imu->bvec) |
edafccee | 8401 | goto err; |
edafccee JA |
8402 | |
8403 | ret = 0; | |
d8ed45c5 | 8404 | mmap_read_lock(current->mm); |
2113b05d | 8405 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8406 | FOLL_WRITE | FOLL_LONGTERM, |
8407 | pages, vmas); | |
edafccee JA |
8408 | if (pret == nr_pages) { |
8409 | /* don't support file backed memory */ | |
8410 | for (j = 0; j < nr_pages; j++) { | |
8411 | struct vm_area_struct *vma = vmas[j]; | |
8412 | ||
8413 | if (vma->vm_file && | |
8414 | !is_file_hugepages(vma->vm_file)) { | |
8415 | ret = -EOPNOTSUPP; | |
8416 | break; | |
8417 | } | |
8418 | } | |
8419 | } else { | |
8420 | ret = pret < 0 ? pret : -EFAULT; | |
8421 | } | |
d8ed45c5 | 8422 | mmap_read_unlock(current->mm); |
edafccee JA |
8423 | if (ret) { |
8424 | /* | |
8425 | * if we did partial map, or found file backed vmas, | |
8426 | * release any pages we did get | |
8427 | */ | |
27c4d3a3 | 8428 | if (pret > 0) |
f1f6a7dd | 8429 | unpin_user_pages(pages, pret); |
de293938 JA |
8430 | kvfree(imu->bvec); |
8431 | goto err; | |
8432 | } | |
8433 | ||
8434 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8435 | if (ret) { | |
8436 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8437 | kvfree(imu->bvec); |
edafccee JA |
8438 | goto err; |
8439 | } | |
8440 | ||
8441 | off = ubuf & ~PAGE_MASK; | |
8442 | size = iov.iov_len; | |
8443 | for (j = 0; j < nr_pages; j++) { | |
8444 | size_t vec_len; | |
8445 | ||
8446 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8447 | imu->bvec[j].bv_page = pages[j]; | |
8448 | imu->bvec[j].bv_len = vec_len; | |
8449 | imu->bvec[j].bv_offset = off; | |
8450 | off = 0; | |
8451 | size -= vec_len; | |
8452 | } | |
8453 | /* store original address for later verification */ | |
8454 | imu->ubuf = ubuf; | |
8455 | imu->len = iov.iov_len; | |
8456 | imu->nr_bvecs = nr_pages; | |
8457 | ||
8458 | ctx->nr_user_bufs++; | |
8459 | } | |
d4ef6475 MR |
8460 | kvfree(pages); |
8461 | kvfree(vmas); | |
edafccee JA |
8462 | return 0; |
8463 | err: | |
d4ef6475 MR |
8464 | kvfree(pages); |
8465 | kvfree(vmas); | |
edafccee JA |
8466 | io_sqe_buffer_unregister(ctx); |
8467 | return ret; | |
8468 | } | |
8469 | ||
9b402849 JA |
8470 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8471 | { | |
8472 | __s32 __user *fds = arg; | |
8473 | int fd; | |
8474 | ||
8475 | if (ctx->cq_ev_fd) | |
8476 | return -EBUSY; | |
8477 | ||
8478 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8479 | return -EFAULT; | |
8480 | ||
8481 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8482 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8483 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8484 | ctx->cq_ev_fd = NULL; | |
8485 | return ret; | |
8486 | } | |
8487 | ||
8488 | return 0; | |
8489 | } | |
8490 | ||
8491 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8492 | { | |
8493 | if (ctx->cq_ev_fd) { | |
8494 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8495 | ctx->cq_ev_fd = NULL; | |
8496 | return 0; | |
8497 | } | |
8498 | ||
8499 | return -ENXIO; | |
8500 | } | |
8501 | ||
5a2e745d JA |
8502 | static int __io_destroy_buffers(int id, void *p, void *data) |
8503 | { | |
8504 | struct io_ring_ctx *ctx = data; | |
8505 | struct io_buffer *buf = p; | |
8506 | ||
067524e9 | 8507 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8508 | return 0; |
8509 | } | |
8510 | ||
8511 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8512 | { | |
8513 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8514 | idr_destroy(&ctx->io_buffer_idr); | |
8515 | } | |
8516 | ||
2b188cc1 JA |
8517 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8518 | { | |
6b06314c | 8519 | io_finish_async(ctx); |
5dbcad51 | 8520 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8521 | |
8522 | if (ctx->sqo_task) { | |
8523 | put_task_struct(ctx->sqo_task); | |
8524 | ctx->sqo_task = NULL; | |
8525 | mmdrop(ctx->mm_account); | |
8526 | ctx->mm_account = NULL; | |
30975825 | 8527 | } |
def596e9 | 8528 | |
91d8f519 DZ |
8529 | #ifdef CONFIG_BLK_CGROUP |
8530 | if (ctx->sqo_blkcg_css) | |
8531 | css_put(ctx->sqo_blkcg_css); | |
8532 | #endif | |
8533 | ||
6b06314c | 8534 | io_sqe_files_unregister(ctx); |
9b402849 | 8535 | io_eventfd_unregister(ctx); |
5a2e745d | 8536 | io_destroy_buffers(ctx); |
41726c9a | 8537 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8538 | |
2b188cc1 | 8539 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8540 | if (ctx->ring_sock) { |
8541 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8542 | sock_release(ctx->ring_sock); |
355e8d26 | 8543 | } |
2b188cc1 JA |
8544 | #endif |
8545 | ||
75b28aff | 8546 | io_mem_free(ctx->rings); |
2b188cc1 | 8547 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8548 | |
8549 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8550 | free_uid(ctx->user); |
181e448d | 8551 | put_cred(ctx->creds); |
78076bb6 | 8552 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8553 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8554 | kfree(ctx); |
8555 | } | |
8556 | ||
8557 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8558 | { | |
8559 | struct io_ring_ctx *ctx = file->private_data; | |
8560 | __poll_t mask = 0; | |
8561 | ||
8562 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8563 | /* |
8564 | * synchronizes with barrier from wq_has_sleeper call in | |
8565 | * io_commit_cqring | |
8566 | */ | |
2b188cc1 | 8567 | smp_rmb(); |
90554200 | 8568 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8569 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8570 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8571 | mask |= EPOLLIN | EPOLLRDNORM; |
8572 | ||
8573 | return mask; | |
8574 | } | |
8575 | ||
8576 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8577 | { | |
8578 | struct io_ring_ctx *ctx = file->private_data; | |
8579 | ||
8580 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8581 | } | |
8582 | ||
071698e1 JA |
8583 | static int io_remove_personalities(int id, void *p, void *data) |
8584 | { | |
8585 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8586 | struct io_identity *iod; |
071698e1 | 8587 | |
1e6fa521 JA |
8588 | iod = idr_remove(&ctx->personality_idr, id); |
8589 | if (iod) { | |
8590 | put_cred(iod->creds); | |
8591 | if (refcount_dec_and_test(&iod->count)) | |
8592 | kfree(iod); | |
8593 | } | |
071698e1 JA |
8594 | return 0; |
8595 | } | |
8596 | ||
85faa7b8 JA |
8597 | static void io_ring_exit_work(struct work_struct *work) |
8598 | { | |
b2edc0a7 PB |
8599 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8600 | exit_work); | |
85faa7b8 | 8601 | |
56952e91 JA |
8602 | /* |
8603 | * If we're doing polled IO and end up having requests being | |
8604 | * submitted async (out-of-line), then completions can come in while | |
8605 | * we're waiting for refs to drop. We need to reap these manually, | |
8606 | * as nobody else will be looking for them. | |
8607 | */ | |
b2edc0a7 | 8608 | do { |
56952e91 | 8609 | if (ctx->rings) |
e6c8aa9a | 8610 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8611 | io_iopoll_try_reap_events(ctx); |
8612 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8613 | io_ring_ctx_free(ctx); |
8614 | } | |
8615 | ||
2b188cc1 JA |
8616 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8617 | { | |
8618 | mutex_lock(&ctx->uring_lock); | |
8619 | percpu_ref_kill(&ctx->refs); | |
8620 | mutex_unlock(&ctx->uring_lock); | |
8621 | ||
6b81928d PB |
8622 | io_kill_timeouts(ctx, NULL, NULL); |
8623 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8624 | |
8625 | if (ctx->io_wq) | |
8626 | io_wq_cancel_all(ctx->io_wq); | |
8627 | ||
15dff286 JA |
8628 | /* if we failed setting up the ctx, we might not have any rings */ |
8629 | if (ctx->rings) | |
e6c8aa9a | 8630 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8631 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8632 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8633 | |
8634 | /* | |
8635 | * Do this upfront, so we won't have a grace period where the ring | |
8636 | * is closed but resources aren't reaped yet. This can cause | |
8637 | * spurious failure in setting up a new ring. | |
8638 | */ | |
760618f7 JA |
8639 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8640 | ACCT_LOCKED); | |
309fc03a | 8641 | |
85faa7b8 | 8642 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8643 | /* |
8644 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8645 | * if we're exiting a ton of rings at the same time. It just adds | |
8646 | * noise and overhead, there's no discernable change in runtime | |
8647 | * over using system_wq. | |
8648 | */ | |
8649 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8650 | } |
8651 | ||
8652 | static int io_uring_release(struct inode *inode, struct file *file) | |
8653 | { | |
8654 | struct io_ring_ctx *ctx = file->private_data; | |
8655 | ||
8656 | file->private_data = NULL; | |
8657 | io_ring_ctx_wait_and_kill(ctx); | |
8658 | return 0; | |
8659 | } | |
8660 | ||
f6edbabb PB |
8661 | struct io_task_cancel { |
8662 | struct task_struct *task; | |
8663 | struct files_struct *files; | |
8664 | }; | |
f254ac04 | 8665 | |
f6edbabb | 8666 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8667 | { |
9a472ef7 | 8668 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8669 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8670 | bool ret; |
8671 | ||
f6edbabb | 8672 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8673 | unsigned long flags; |
8674 | struct io_ring_ctx *ctx = req->ctx; | |
8675 | ||
8676 | /* protect against races with linked timeouts */ | |
8677 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8678 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8679 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8680 | } else { | |
f6edbabb | 8681 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8682 | } |
8683 | return ret; | |
b711d4ea JA |
8684 | } |
8685 | ||
b7ddce3c | 8686 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8687 | struct task_struct *task, |
b7ddce3c PB |
8688 | struct files_struct *files) |
8689 | { | |
8690 | struct io_defer_entry *de = NULL; | |
8691 | LIST_HEAD(list); | |
8692 | ||
8693 | spin_lock_irq(&ctx->completion_lock); | |
8694 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8695 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8696 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8697 | break; | |
8698 | } | |
8699 | } | |
8700 | spin_unlock_irq(&ctx->completion_lock); | |
8701 | ||
8702 | while (!list_empty(&list)) { | |
8703 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8704 | list_del_init(&de->list); | |
8705 | req_set_fail_links(de->req); | |
8706 | io_put_req(de->req); | |
8707 | io_req_complete(de->req, -ECANCELED); | |
8708 | kfree(de); | |
8709 | } | |
8710 | } | |
8711 | ||
b52fda00 | 8712 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8713 | struct task_struct *task, |
fcb323cc JA |
8714 | struct files_struct *files) |
8715 | { | |
fcb323cc | 8716 | while (!list_empty_careful(&ctx->inflight_list)) { |
f6edbabb PB |
8717 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
8718 | struct io_kiocb *req; | |
d8f1b971 | 8719 | DEFINE_WAIT(wait); |
f6edbabb | 8720 | bool found = false; |
fcb323cc JA |
8721 | |
8722 | spin_lock_irq(&ctx->inflight_lock); | |
8723 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
df9923f9 PB |
8724 | if (req->task == task && |
8725 | (req->work.flags & IO_WQ_WORK_FILES) && | |
98447d65 | 8726 | req->work.identity->files != files) |
768134d4 | 8727 | continue; |
f6edbabb | 8728 | found = true; |
768134d4 | 8729 | break; |
fcb323cc | 8730 | } |
f6edbabb | 8731 | if (found) |
fcb323cc | 8732 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8733 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8734 | spin_unlock_irq(&ctx->inflight_lock); |
8735 | ||
768134d4 | 8736 | /* We need to keep going until we don't find a matching req */ |
f6edbabb | 8737 | if (!found) |
fcb323cc | 8738 | break; |
f6edbabb PB |
8739 | |
8740 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); | |
8741 | io_poll_remove_all(ctx, task, files); | |
8742 | io_kill_timeouts(ctx, task, files); | |
6200b0ae JA |
8743 | /* cancellations _may_ trigger task work */ |
8744 | io_run_task_work(); | |
fcb323cc | 8745 | schedule(); |
d8f1b971 | 8746 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
8747 | } |
8748 | } | |
8749 | ||
b52fda00 PB |
8750 | static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8751 | struct task_struct *task) | |
0f212204 | 8752 | { |
b52fda00 | 8753 | while (1) { |
f6edbabb | 8754 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
0f212204 | 8755 | enum io_wq_cancel cret; |
b52fda00 | 8756 | bool ret = false; |
0f212204 | 8757 | |
f6edbabb | 8758 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); |
0f212204 JA |
8759 | if (cret != IO_WQ_CANCEL_NOTFOUND) |
8760 | ret = true; | |
8761 | ||
8762 | /* SQPOLL thread does its own polling */ | |
8763 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8764 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8765 | io_iopoll_try_reap_events(ctx); | |
8766 | ret = true; | |
8767 | } | |
8768 | } | |
8769 | ||
6b81928d PB |
8770 | ret |= io_poll_remove_all(ctx, task, NULL); |
8771 | ret |= io_kill_timeouts(ctx, task, NULL); | |
b52fda00 PB |
8772 | if (!ret) |
8773 | break; | |
8774 | io_run_task_work(); | |
8775 | cond_resched(); | |
0f212204 | 8776 | } |
0f212204 JA |
8777 | } |
8778 | ||
8779 | /* | |
8780 | * We need to iteratively cancel requests, in case a request has dependent | |
8781 | * hard links. These persist even for failure of cancelations, hence keep | |
8782 | * looping until none are found. | |
8783 | */ | |
8784 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8785 | struct files_struct *files) | |
8786 | { | |
8787 | struct task_struct *task = current; | |
8788 | ||
fdaf083c | 8789 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
534ca6d6 | 8790 | task = ctx->sq_data->thread; |
fdaf083c JA |
8791 | atomic_inc(&task->io_uring->in_idle); |
8792 | io_sq_thread_park(ctx->sq_data); | |
8793 | } | |
0f212204 | 8794 | |
df9923f9 | 8795 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 8796 | io_cqring_overflow_flush(ctx, true, task, files); |
b52fda00 | 8797 | io_uring_cancel_files(ctx, task, files); |
0f212204 | 8798 | |
b52fda00 PB |
8799 | if (!files) |
8800 | __io_uring_cancel_task_requests(ctx, task); | |
fdaf083c JA |
8801 | |
8802 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8803 | atomic_dec(&task->io_uring->in_idle); | |
8804 | /* | |
8805 | * If the files that are going away are the ones in the thread | |
8806 | * identity, clear them out. | |
8807 | */ | |
8808 | if (task->io_uring->identity->files == files) | |
8809 | task->io_uring->identity->files = NULL; | |
8810 | io_sq_thread_unpark(ctx->sq_data); | |
8811 | } | |
0f212204 JA |
8812 | } |
8813 | ||
8814 | /* | |
8815 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8816 | */ | |
fdaf083c | 8817 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 8818 | { |
236434c3 MWO |
8819 | struct io_uring_task *tctx = current->io_uring; |
8820 | ||
8821 | if (unlikely(!tctx)) { | |
0f212204 JA |
8822 | int ret; |
8823 | ||
8824 | ret = io_uring_alloc_task_context(current); | |
8825 | if (unlikely(ret)) | |
8826 | return ret; | |
236434c3 | 8827 | tctx = current->io_uring; |
0f212204 | 8828 | } |
236434c3 MWO |
8829 | if (tctx->last != file) { |
8830 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8831 | |
236434c3 | 8832 | if (!old) { |
0f212204 | 8833 | get_file(file); |
236434c3 | 8834 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8835 | } |
236434c3 | 8836 | tctx->last = file; |
0f212204 JA |
8837 | } |
8838 | ||
fdaf083c JA |
8839 | /* |
8840 | * This is race safe in that the task itself is doing this, hence it | |
8841 | * cannot be going through the exit/cancel paths at the same time. | |
8842 | * This cannot be modified while exit/cancel is running. | |
8843 | */ | |
8844 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
8845 | tctx->sqpoll = true; | |
8846 | ||
0f212204 JA |
8847 | return 0; |
8848 | } | |
8849 | ||
8850 | /* | |
8851 | * Remove this io_uring_file -> task mapping. | |
8852 | */ | |
8853 | static void io_uring_del_task_file(struct file *file) | |
8854 | { | |
8855 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8856 | |
8857 | if (tctx->last == file) | |
8858 | tctx->last = NULL; | |
5e2ed8c4 | 8859 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8860 | if (file) |
8861 | fput(file); | |
8862 | } | |
8863 | ||
0f212204 JA |
8864 | /* |
8865 | * Drop task note for this file if we're the only ones that hold it after | |
8866 | * pending fput() | |
8867 | */ | |
c8fb20b5 | 8868 | static void io_uring_attempt_task_drop(struct file *file) |
0f212204 JA |
8869 | { |
8870 | if (!current->io_uring) | |
8871 | return; | |
8872 | /* | |
8873 | * fput() is pending, will be 2 if the only other ref is our potential | |
8874 | * task file note. If the task is exiting, drop regardless of count. | |
8875 | */ | |
c8fb20b5 PB |
8876 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING) || |
8877 | atomic_long_read(&file->f_count) == 2) | |
8878 | io_uring_del_task_file(file); | |
0f212204 JA |
8879 | } |
8880 | ||
8881 | void __io_uring_files_cancel(struct files_struct *files) | |
8882 | { | |
8883 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8884 | struct file *file; |
8885 | unsigned long index; | |
0f212204 JA |
8886 | |
8887 | /* make sure overflow events are dropped */ | |
fdaf083c | 8888 | atomic_inc(&tctx->in_idle); |
0f212204 | 8889 | |
ce765372 MWO |
8890 | xa_for_each(&tctx->xa, index, file) { |
8891 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
8892 | |
8893 | io_uring_cancel_task_requests(ctx, files); | |
8894 | if (files) | |
8895 | io_uring_del_task_file(file); | |
ce765372 | 8896 | } |
fdaf083c JA |
8897 | |
8898 | atomic_dec(&tctx->in_idle); | |
8899 | } | |
8900 | ||
8901 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
8902 | { | |
8903 | unsigned long index; | |
8904 | struct file *file; | |
8905 | s64 inflight; | |
8906 | ||
8907 | inflight = percpu_counter_sum(&tctx->inflight); | |
8908 | if (!tctx->sqpoll) | |
8909 | return inflight; | |
8910 | ||
8911 | /* | |
8912 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
8913 | * add the pending count for those. | |
8914 | */ | |
8915 | xa_for_each(&tctx->xa, index, file) { | |
8916 | struct io_ring_ctx *ctx = file->private_data; | |
8917 | ||
8918 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
8919 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
8920 | ||
8921 | inflight += percpu_counter_sum(&__tctx->inflight); | |
8922 | } | |
8923 | } | |
8924 | ||
8925 | return inflight; | |
0f212204 JA |
8926 | } |
8927 | ||
0f212204 JA |
8928 | /* |
8929 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8930 | * requests. | |
8931 | */ | |
8932 | void __io_uring_task_cancel(void) | |
8933 | { | |
8934 | struct io_uring_task *tctx = current->io_uring; | |
8935 | DEFINE_WAIT(wait); | |
d8a6df10 | 8936 | s64 inflight; |
0f212204 JA |
8937 | |
8938 | /* make sure overflow events are dropped */ | |
fdaf083c | 8939 | atomic_inc(&tctx->in_idle); |
0f212204 | 8940 | |
d8a6df10 | 8941 | do { |
0f212204 | 8942 | /* read completions before cancelations */ |
fdaf083c | 8943 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
8944 | if (!inflight) |
8945 | break; | |
0f212204 JA |
8946 | __io_uring_files_cancel(NULL); |
8947 | ||
8948 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8949 | ||
8950 | /* | |
8951 | * If we've seen completions, retry. This avoids a race where | |
8952 | * a completion comes in before we did prepare_to_wait(). | |
8953 | */ | |
fdaf083c | 8954 | if (inflight != tctx_inflight(tctx)) |
0f212204 | 8955 | continue; |
0f212204 | 8956 | schedule(); |
d8a6df10 | 8957 | } while (1); |
0f212204 JA |
8958 | |
8959 | finish_wait(&tctx->wait, &wait); | |
fdaf083c | 8960 | atomic_dec(&tctx->in_idle); |
44e728b8 PB |
8961 | } |
8962 | ||
fcb323cc JA |
8963 | static int io_uring_flush(struct file *file, void *data) |
8964 | { | |
c8fb20b5 | 8965 | io_uring_attempt_task_drop(file); |
fcb323cc JA |
8966 | return 0; |
8967 | } | |
8968 | ||
6c5c240e RP |
8969 | static void *io_uring_validate_mmap_request(struct file *file, |
8970 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8971 | { |
2b188cc1 | 8972 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8973 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8974 | struct page *page; |
8975 | void *ptr; | |
8976 | ||
8977 | switch (offset) { | |
8978 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8979 | case IORING_OFF_CQ_RING: |
8980 | ptr = ctx->rings; | |
2b188cc1 JA |
8981 | break; |
8982 | case IORING_OFF_SQES: | |
8983 | ptr = ctx->sq_sqes; | |
8984 | break; | |
2b188cc1 | 8985 | default: |
6c5c240e | 8986 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8987 | } |
8988 | ||
8989 | page = virt_to_head_page(ptr); | |
a50b854e | 8990 | if (sz > page_size(page)) |
6c5c240e RP |
8991 | return ERR_PTR(-EINVAL); |
8992 | ||
8993 | return ptr; | |
8994 | } | |
8995 | ||
8996 | #ifdef CONFIG_MMU | |
8997 | ||
8998 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8999 | { | |
9000 | size_t sz = vma->vm_end - vma->vm_start; | |
9001 | unsigned long pfn; | |
9002 | void *ptr; | |
9003 | ||
9004 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9005 | if (IS_ERR(ptr)) | |
9006 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9007 | |
9008 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9009 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9010 | } | |
9011 | ||
6c5c240e RP |
9012 | #else /* !CONFIG_MMU */ |
9013 | ||
9014 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9015 | { | |
9016 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9017 | } | |
9018 | ||
9019 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9020 | { | |
9021 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9022 | } | |
9023 | ||
9024 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9025 | unsigned long addr, unsigned long len, | |
9026 | unsigned long pgoff, unsigned long flags) | |
9027 | { | |
9028 | void *ptr; | |
9029 | ||
9030 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9031 | if (IS_ERR(ptr)) | |
9032 | return PTR_ERR(ptr); | |
9033 | ||
9034 | return (unsigned long) ptr; | |
9035 | } | |
9036 | ||
9037 | #endif /* !CONFIG_MMU */ | |
9038 | ||
90554200 JA |
9039 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
9040 | { | |
9041 | DEFINE_WAIT(wait); | |
9042 | ||
9043 | do { | |
9044 | if (!io_sqring_full(ctx)) | |
9045 | break; | |
9046 | ||
9047 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9048 | ||
9049 | if (!io_sqring_full(ctx)) | |
9050 | break; | |
9051 | ||
9052 | schedule(); | |
9053 | } while (!signal_pending(current)); | |
9054 | ||
9055 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
9056 | } | |
9057 | ||
c73ebb68 HX |
9058 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9059 | struct __kernel_timespec __user **ts, | |
9060 | const sigset_t __user **sig) | |
9061 | { | |
9062 | struct io_uring_getevents_arg arg; | |
9063 | ||
9064 | /* | |
9065 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9066 | * is just a pointer to the sigset_t. | |
9067 | */ | |
9068 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9069 | *sig = (const sigset_t __user *) argp; | |
9070 | *ts = NULL; | |
9071 | return 0; | |
9072 | } | |
9073 | ||
9074 | /* | |
9075 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9076 | * timespec and sigset_t pointers if good. | |
9077 | */ | |
9078 | if (*argsz != sizeof(arg)) | |
9079 | return -EINVAL; | |
9080 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9081 | return -EFAULT; | |
9082 | *sig = u64_to_user_ptr(arg.sigmask); | |
9083 | *argsz = arg.sigmask_sz; | |
9084 | *ts = u64_to_user_ptr(arg.ts); | |
9085 | return 0; | |
9086 | } | |
9087 | ||
2b188cc1 | 9088 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9089 | u32, min_complete, u32, flags, const void __user *, argp, |
9090 | size_t, argsz) | |
2b188cc1 JA |
9091 | { |
9092 | struct io_ring_ctx *ctx; | |
9093 | long ret = -EBADF; | |
9094 | int submitted = 0; | |
9095 | struct fd f; | |
9096 | ||
4c6e277c | 9097 | io_run_task_work(); |
b41e9852 | 9098 | |
90554200 | 9099 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9100 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9101 | return -EINVAL; |
9102 | ||
9103 | f = fdget(fd); | |
9104 | if (!f.file) | |
9105 | return -EBADF; | |
9106 | ||
9107 | ret = -EOPNOTSUPP; | |
9108 | if (f.file->f_op != &io_uring_fops) | |
9109 | goto out_fput; | |
9110 | ||
9111 | ret = -ENXIO; | |
9112 | ctx = f.file->private_data; | |
9113 | if (!percpu_ref_tryget(&ctx->refs)) | |
9114 | goto out_fput; | |
9115 | ||
7e84e1c7 SG |
9116 | ret = -EBADFD; |
9117 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9118 | goto out; | |
9119 | ||
6c271ce2 JA |
9120 | /* |
9121 | * For SQ polling, the thread will do all submissions and completions. | |
9122 | * Just return the requested submit count, and wake the thread if | |
9123 | * we were asked to. | |
9124 | */ | |
b2a9eada | 9125 | ret = 0; |
6c271ce2 | 9126 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 9127 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 9128 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 9129 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9130 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
9131 | if (flags & IORING_ENTER_SQ_WAIT) |
9132 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 9133 | submitted = to_submit; |
b2a9eada | 9134 | } else if (to_submit) { |
fdaf083c | 9135 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9136 | if (unlikely(ret)) |
9137 | goto out; | |
2b188cc1 | 9138 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9139 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9140 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9141 | |
9142 | if (submitted != to_submit) | |
9143 | goto out; | |
2b188cc1 JA |
9144 | } |
9145 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9146 | const sigset_t __user *sig; |
9147 | struct __kernel_timespec __user *ts; | |
9148 | ||
9149 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9150 | if (unlikely(ret)) | |
9151 | goto out; | |
9152 | ||
2b188cc1 JA |
9153 | min_complete = min(min_complete, ctx->cq_entries); |
9154 | ||
32b2244a XW |
9155 | /* |
9156 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9157 | * space applications don't need to do io completion events | |
9158 | * polling again, they can rely on io_sq_thread to do polling | |
9159 | * work, which can reduce cpu usage and uring_lock contention. | |
9160 | */ | |
9161 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9162 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9163 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9164 | } else { |
c73ebb68 | 9165 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9166 | } |
2b188cc1 JA |
9167 | } |
9168 | ||
7c504e65 | 9169 | out: |
6805b32e | 9170 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9171 | out_fput: |
9172 | fdput(f); | |
9173 | return submitted ? submitted : ret; | |
9174 | } | |
9175 | ||
bebdb65e | 9176 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9177 | static int io_uring_show_cred(int id, void *p, void *data) |
9178 | { | |
6b47ab81 JA |
9179 | struct io_identity *iod = p; |
9180 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9181 | struct seq_file *m = data; |
9182 | struct user_namespace *uns = seq_user_ns(m); | |
9183 | struct group_info *gi; | |
9184 | kernel_cap_t cap; | |
9185 | unsigned __capi; | |
9186 | int g; | |
9187 | ||
9188 | seq_printf(m, "%5d\n", id); | |
9189 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9190 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9191 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9192 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9193 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9194 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9195 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9196 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9197 | seq_puts(m, "\n\tGroups:\t"); | |
9198 | gi = cred->group_info; | |
9199 | for (g = 0; g < gi->ngroups; g++) { | |
9200 | seq_put_decimal_ull(m, g ? " " : "", | |
9201 | from_kgid_munged(uns, gi->gid[g])); | |
9202 | } | |
9203 | seq_puts(m, "\n\tCapEff:\t"); | |
9204 | cap = cred->cap_effective; | |
9205 | CAP_FOR_EACH_U32(__capi) | |
9206 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9207 | seq_putc(m, '\n'); | |
9208 | return 0; | |
9209 | } | |
9210 | ||
9211 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9212 | { | |
dbbe9c64 | 9213 | struct io_sq_data *sq = NULL; |
fad8e0de | 9214 | bool has_lock; |
87ce955b JA |
9215 | int i; |
9216 | ||
fad8e0de JA |
9217 | /* |
9218 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9219 | * since fdinfo case grabs it in the opposite direction of normal use | |
9220 | * cases. If we fail to get the lock, we just don't iterate any | |
9221 | * structures that could be going away outside the io_uring mutex. | |
9222 | */ | |
9223 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9224 | ||
dbbe9c64 JQ |
9225 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9226 | sq = ctx->sq_data; | |
9227 | ||
9228 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9229 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9230 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9231 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9232 | struct fixed_file_table *table; |
9233 | struct file *f; | |
9234 | ||
9235 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9236 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9237 | if (f) | |
9238 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9239 | else | |
9240 | seq_printf(m, "%5u: <none>\n", i); | |
9241 | } | |
9242 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9243 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9244 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9245 | ||
9246 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9247 | (unsigned int) buf->len); | |
9248 | } | |
fad8e0de | 9249 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9250 | seq_printf(m, "Personalities:\n"); |
9251 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9252 | } | |
d7718a9d JA |
9253 | seq_printf(m, "PollList:\n"); |
9254 | spin_lock_irq(&ctx->completion_lock); | |
9255 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9256 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9257 | struct io_kiocb *req; | |
9258 | ||
9259 | hlist_for_each_entry(req, list, hash_node) | |
9260 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9261 | req->task->task_works != NULL); | |
9262 | } | |
9263 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9264 | if (has_lock) |
9265 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9266 | } |
9267 | ||
9268 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9269 | { | |
9270 | struct io_ring_ctx *ctx = f->private_data; | |
9271 | ||
9272 | if (percpu_ref_tryget(&ctx->refs)) { | |
9273 | __io_uring_show_fdinfo(ctx, m); | |
9274 | percpu_ref_put(&ctx->refs); | |
9275 | } | |
9276 | } | |
bebdb65e | 9277 | #endif |
87ce955b | 9278 | |
2b188cc1 JA |
9279 | static const struct file_operations io_uring_fops = { |
9280 | .release = io_uring_release, | |
fcb323cc | 9281 | .flush = io_uring_flush, |
2b188cc1 | 9282 | .mmap = io_uring_mmap, |
6c5c240e RP |
9283 | #ifndef CONFIG_MMU |
9284 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9285 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9286 | #endif | |
2b188cc1 JA |
9287 | .poll = io_uring_poll, |
9288 | .fasync = io_uring_fasync, | |
bebdb65e | 9289 | #ifdef CONFIG_PROC_FS |
87ce955b | 9290 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9291 | #endif |
2b188cc1 JA |
9292 | }; |
9293 | ||
9294 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9295 | struct io_uring_params *p) | |
9296 | { | |
75b28aff HV |
9297 | struct io_rings *rings; |
9298 | size_t size, sq_array_offset; | |
2b188cc1 | 9299 | |
bd740481 JA |
9300 | /* make sure these are sane, as we already accounted them */ |
9301 | ctx->sq_entries = p->sq_entries; | |
9302 | ctx->cq_entries = p->cq_entries; | |
9303 | ||
75b28aff HV |
9304 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9305 | if (size == SIZE_MAX) | |
9306 | return -EOVERFLOW; | |
9307 | ||
9308 | rings = io_mem_alloc(size); | |
9309 | if (!rings) | |
2b188cc1 JA |
9310 | return -ENOMEM; |
9311 | ||
75b28aff HV |
9312 | ctx->rings = rings; |
9313 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9314 | rings->sq_ring_mask = p->sq_entries - 1; | |
9315 | rings->cq_ring_mask = p->cq_entries - 1; | |
9316 | rings->sq_ring_entries = p->sq_entries; | |
9317 | rings->cq_ring_entries = p->cq_entries; | |
9318 | ctx->sq_mask = rings->sq_ring_mask; | |
9319 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9320 | |
9321 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9322 | if (size == SIZE_MAX) { |
9323 | io_mem_free(ctx->rings); | |
9324 | ctx->rings = NULL; | |
2b188cc1 | 9325 | return -EOVERFLOW; |
eb065d30 | 9326 | } |
2b188cc1 JA |
9327 | |
9328 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9329 | if (!ctx->sq_sqes) { |
9330 | io_mem_free(ctx->rings); | |
9331 | ctx->rings = NULL; | |
2b188cc1 | 9332 | return -ENOMEM; |
eb065d30 | 9333 | } |
2b188cc1 | 9334 | |
2b188cc1 JA |
9335 | return 0; |
9336 | } | |
9337 | ||
9338 | /* | |
9339 | * Allocate an anonymous fd, this is what constitutes the application | |
9340 | * visible backing of an io_uring instance. The application mmaps this | |
9341 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9342 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9343 | */ | |
9344 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9345 | { | |
9346 | struct file *file; | |
9347 | int ret; | |
9348 | ||
9349 | #if defined(CONFIG_UNIX) | |
9350 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9351 | &ctx->ring_sock); | |
9352 | if (ret) | |
9353 | return ret; | |
9354 | #endif | |
9355 | ||
9356 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9357 | if (ret < 0) | |
9358 | goto err; | |
9359 | ||
9360 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9361 | O_RDWR | O_CLOEXEC); | |
9362 | if (IS_ERR(file)) { | |
0f212204 | 9363 | err_fd: |
2b188cc1 JA |
9364 | put_unused_fd(ret); |
9365 | ret = PTR_ERR(file); | |
9366 | goto err; | |
9367 | } | |
9368 | ||
9369 | #if defined(CONFIG_UNIX) | |
9370 | ctx->ring_sock->file = file; | |
9371 | #endif | |
fdaf083c | 9372 | if (unlikely(io_uring_add_task_file(ctx, file))) { |
0f212204 JA |
9373 | file = ERR_PTR(-ENOMEM); |
9374 | goto err_fd; | |
9375 | } | |
2b188cc1 JA |
9376 | fd_install(ret, file); |
9377 | return ret; | |
9378 | err: | |
9379 | #if defined(CONFIG_UNIX) | |
9380 | sock_release(ctx->ring_sock); | |
9381 | ctx->ring_sock = NULL; | |
9382 | #endif | |
9383 | return ret; | |
9384 | } | |
9385 | ||
7f13657d XW |
9386 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9387 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9388 | { |
9389 | struct user_struct *user = NULL; | |
9390 | struct io_ring_ctx *ctx; | |
aad5d8da | 9391 | bool limit_mem; |
2b188cc1 JA |
9392 | int ret; |
9393 | ||
8110c1a6 | 9394 | if (!entries) |
2b188cc1 | 9395 | return -EINVAL; |
8110c1a6 JA |
9396 | if (entries > IORING_MAX_ENTRIES) { |
9397 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9398 | return -EINVAL; | |
9399 | entries = IORING_MAX_ENTRIES; | |
9400 | } | |
2b188cc1 JA |
9401 | |
9402 | /* | |
9403 | * Use twice as many entries for the CQ ring. It's possible for the | |
9404 | * application to drive a higher depth than the size of the SQ ring, | |
9405 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9406 | * some flexibility in overcommitting a bit. If the application has |
9407 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9408 | * of CQ ring entries manually. | |
2b188cc1 JA |
9409 | */ |
9410 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9411 | if (p->flags & IORING_SETUP_CQSIZE) { |
9412 | /* | |
9413 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9414 | * to a power-of-two, if it isn't already. We do NOT impose | |
9415 | * any cq vs sq ring sizing. | |
9416 | */ | |
88ec3211 | 9417 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8110c1a6 | 9418 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9419 | return -EINVAL; |
8110c1a6 JA |
9420 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9421 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9422 | return -EINVAL; | |
9423 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9424 | } | |
33a107f0 JA |
9425 | } else { |
9426 | p->cq_entries = 2 * p->sq_entries; | |
9427 | } | |
2b188cc1 JA |
9428 | |
9429 | user = get_uid(current_user()); | |
aad5d8da | 9430 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9431 | |
aad5d8da | 9432 | if (limit_mem) { |
a087e2b5 | 9433 | ret = __io_account_mem(user, |
2b188cc1 JA |
9434 | ring_pages(p->sq_entries, p->cq_entries)); |
9435 | if (ret) { | |
9436 | free_uid(user); | |
9437 | return ret; | |
9438 | } | |
9439 | } | |
9440 | ||
9441 | ctx = io_ring_ctx_alloc(p); | |
9442 | if (!ctx) { | |
aad5d8da | 9443 | if (limit_mem) |
a087e2b5 | 9444 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9445 | p->cq_entries)); |
9446 | free_uid(user); | |
9447 | return -ENOMEM; | |
9448 | } | |
9449 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9450 | ctx->user = user; |
0b8c0ec7 | 9451 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9452 | #ifdef CONFIG_AUDIT |
9453 | ctx->loginuid = current->loginuid; | |
9454 | ctx->sessionid = current->sessionid; | |
9455 | #endif | |
2aede0e4 JA |
9456 | ctx->sqo_task = get_task_struct(current); |
9457 | ||
9458 | /* | |
9459 | * This is just grabbed for accounting purposes. When a process exits, | |
9460 | * the mm is exited and dropped before the files, hence we need to hang | |
9461 | * on to this mm purely for the purposes of being able to unaccount | |
9462 | * memory (locked/pinned vm). It's not used for anything else. | |
9463 | */ | |
6b7898eb | 9464 | mmgrab(current->mm); |
2aede0e4 | 9465 | ctx->mm_account = current->mm; |
6b7898eb | 9466 | |
91d8f519 DZ |
9467 | #ifdef CONFIG_BLK_CGROUP |
9468 | /* | |
9469 | * The sq thread will belong to the original cgroup it was inited in. | |
9470 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9471 | * issued bios will be associated with the closest cgroup later in the | |
9472 | * block layer. | |
9473 | */ | |
9474 | rcu_read_lock(); | |
9475 | ctx->sqo_blkcg_css = blkcg_css(); | |
9476 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9477 | rcu_read_unlock(); | |
9478 | if (!ret) { | |
9479 | /* don't init against a dying cgroup, have the user try again */ | |
9480 | ctx->sqo_blkcg_css = NULL; | |
9481 | ret = -ENODEV; | |
9482 | goto err; | |
9483 | } | |
9484 | #endif | |
6b7898eb | 9485 | |
f74441e6 JA |
9486 | /* |
9487 | * Account memory _before_ installing the file descriptor. Once | |
9488 | * the descriptor is installed, it can get closed at any time. Also | |
9489 | * do this before hitting the general error path, as ring freeing | |
9490 | * will un-account as well. | |
9491 | */ | |
9492 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9493 | ACCT_LOCKED); | |
9494 | ctx->limit_mem = limit_mem; | |
9495 | ||
2b188cc1 JA |
9496 | ret = io_allocate_scq_urings(ctx, p); |
9497 | if (ret) | |
9498 | goto err; | |
9499 | ||
7e84e1c7 | 9500 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9501 | if (ret) |
9502 | goto err; | |
9503 | ||
7e84e1c7 SG |
9504 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9505 | io_sq_offload_start(ctx); | |
9506 | ||
2b188cc1 | 9507 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9508 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9509 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9510 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9511 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9512 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9513 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9514 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9515 | |
9516 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9517 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9518 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9519 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9520 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9521 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9522 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9523 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9524 | |
7f13657d XW |
9525 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9526 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9527 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9528 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9529 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9530 | |
9531 | if (copy_to_user(params, p, sizeof(*p))) { | |
9532 | ret = -EFAULT; | |
9533 | goto err; | |
9534 | } | |
d1719f70 | 9535 | |
044c1ab3 JA |
9536 | /* |
9537 | * Install ring fd as the very last thing, so we don't risk someone | |
9538 | * having closed it before we finish setup | |
9539 | */ | |
9540 | ret = io_uring_get_fd(ctx); | |
9541 | if (ret < 0) | |
9542 | goto err; | |
9543 | ||
c826bd7a | 9544 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9545 | return ret; |
9546 | err: | |
9547 | io_ring_ctx_wait_and_kill(ctx); | |
9548 | return ret; | |
9549 | } | |
9550 | ||
9551 | /* | |
9552 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9553 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9554 | * params structure passed in. | |
9555 | */ | |
9556 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9557 | { | |
9558 | struct io_uring_params p; | |
2b188cc1 JA |
9559 | int i; |
9560 | ||
9561 | if (copy_from_user(&p, params, sizeof(p))) | |
9562 | return -EFAULT; | |
9563 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9564 | if (p.resv[i]) | |
9565 | return -EINVAL; | |
9566 | } | |
9567 | ||
6c271ce2 | 9568 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9569 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9570 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9571 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9572 | return -EINVAL; |
9573 | ||
7f13657d | 9574 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9575 | } |
9576 | ||
9577 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9578 | struct io_uring_params __user *, params) | |
9579 | { | |
9580 | return io_uring_setup(entries, params); | |
9581 | } | |
9582 | ||
66f4af93 JA |
9583 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9584 | { | |
9585 | struct io_uring_probe *p; | |
9586 | size_t size; | |
9587 | int i, ret; | |
9588 | ||
9589 | size = struct_size(p, ops, nr_args); | |
9590 | if (size == SIZE_MAX) | |
9591 | return -EOVERFLOW; | |
9592 | p = kzalloc(size, GFP_KERNEL); | |
9593 | if (!p) | |
9594 | return -ENOMEM; | |
9595 | ||
9596 | ret = -EFAULT; | |
9597 | if (copy_from_user(p, arg, size)) | |
9598 | goto out; | |
9599 | ret = -EINVAL; | |
9600 | if (memchr_inv(p, 0, size)) | |
9601 | goto out; | |
9602 | ||
9603 | p->last_op = IORING_OP_LAST - 1; | |
9604 | if (nr_args > IORING_OP_LAST) | |
9605 | nr_args = IORING_OP_LAST; | |
9606 | ||
9607 | for (i = 0; i < nr_args; i++) { | |
9608 | p->ops[i].op = i; | |
9609 | if (!io_op_defs[i].not_supported) | |
9610 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9611 | } | |
9612 | p->ops_len = i; | |
9613 | ||
9614 | ret = 0; | |
9615 | if (copy_to_user(arg, p, size)) | |
9616 | ret = -EFAULT; | |
9617 | out: | |
9618 | kfree(p); | |
9619 | return ret; | |
9620 | } | |
9621 | ||
071698e1 JA |
9622 | static int io_register_personality(struct io_ring_ctx *ctx) |
9623 | { | |
1e6fa521 JA |
9624 | struct io_identity *id; |
9625 | int ret; | |
071698e1 | 9626 | |
1e6fa521 JA |
9627 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9628 | if (unlikely(!id)) | |
9629 | return -ENOMEM; | |
9630 | ||
9631 | io_init_identity(id); | |
9632 | id->creds = get_current_cred(); | |
9633 | ||
9634 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9635 | if (ret < 0) { | |
9636 | put_cred(id->creds); | |
9637 | kfree(id); | |
9638 | } | |
9639 | return ret; | |
071698e1 JA |
9640 | } |
9641 | ||
9642 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9643 | { | |
1e6fa521 | 9644 | struct io_identity *iod; |
071698e1 | 9645 | |
1e6fa521 JA |
9646 | iod = idr_remove(&ctx->personality_idr, id); |
9647 | if (iod) { | |
9648 | put_cred(iod->creds); | |
9649 | if (refcount_dec_and_test(&iod->count)) | |
9650 | kfree(iod); | |
071698e1 JA |
9651 | return 0; |
9652 | } | |
9653 | ||
9654 | return -EINVAL; | |
9655 | } | |
9656 | ||
21b55dbc SG |
9657 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9658 | unsigned int nr_args) | |
9659 | { | |
9660 | struct io_uring_restriction *res; | |
9661 | size_t size; | |
9662 | int i, ret; | |
9663 | ||
7e84e1c7 SG |
9664 | /* Restrictions allowed only if rings started disabled */ |
9665 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9666 | return -EBADFD; | |
9667 | ||
21b55dbc | 9668 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9669 | if (ctx->restrictions.registered) |
21b55dbc SG |
9670 | return -EBUSY; |
9671 | ||
9672 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9673 | return -EINVAL; | |
9674 | ||
9675 | size = array_size(nr_args, sizeof(*res)); | |
9676 | if (size == SIZE_MAX) | |
9677 | return -EOVERFLOW; | |
9678 | ||
9679 | res = memdup_user(arg, size); | |
9680 | if (IS_ERR(res)) | |
9681 | return PTR_ERR(res); | |
9682 | ||
9683 | ret = 0; | |
9684 | ||
9685 | for (i = 0; i < nr_args; i++) { | |
9686 | switch (res[i].opcode) { | |
9687 | case IORING_RESTRICTION_REGISTER_OP: | |
9688 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9689 | ret = -EINVAL; | |
9690 | goto out; | |
9691 | } | |
9692 | ||
9693 | __set_bit(res[i].register_op, | |
9694 | ctx->restrictions.register_op); | |
9695 | break; | |
9696 | case IORING_RESTRICTION_SQE_OP: | |
9697 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9698 | ret = -EINVAL; | |
9699 | goto out; | |
9700 | } | |
9701 | ||
9702 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9703 | break; | |
9704 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9705 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9706 | break; | |
9707 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9708 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9709 | break; | |
9710 | default: | |
9711 | ret = -EINVAL; | |
9712 | goto out; | |
9713 | } | |
9714 | } | |
9715 | ||
9716 | out: | |
9717 | /* Reset all restrictions if an error happened */ | |
9718 | if (ret != 0) | |
9719 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9720 | else | |
7e84e1c7 | 9721 | ctx->restrictions.registered = true; |
21b55dbc SG |
9722 | |
9723 | kfree(res); | |
9724 | return ret; | |
9725 | } | |
9726 | ||
7e84e1c7 SG |
9727 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9728 | { | |
9729 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9730 | return -EBADFD; | |
9731 | ||
9732 | if (ctx->restrictions.registered) | |
9733 | ctx->restricted = 1; | |
9734 | ||
9735 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9736 | ||
9737 | io_sq_offload_start(ctx); | |
9738 | ||
9739 | return 0; | |
9740 | } | |
9741 | ||
071698e1 JA |
9742 | static bool io_register_op_must_quiesce(int op) |
9743 | { | |
9744 | switch (op) { | |
9745 | case IORING_UNREGISTER_FILES: | |
9746 | case IORING_REGISTER_FILES_UPDATE: | |
9747 | case IORING_REGISTER_PROBE: | |
9748 | case IORING_REGISTER_PERSONALITY: | |
9749 | case IORING_UNREGISTER_PERSONALITY: | |
9750 | return false; | |
9751 | default: | |
9752 | return true; | |
9753 | } | |
9754 | } | |
9755 | ||
edafccee JA |
9756 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9757 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9758 | __releases(ctx->uring_lock) |
9759 | __acquires(ctx->uring_lock) | |
edafccee JA |
9760 | { |
9761 | int ret; | |
9762 | ||
35fa71a0 JA |
9763 | /* |
9764 | * We're inside the ring mutex, if the ref is already dying, then | |
9765 | * someone else killed the ctx or is already going through | |
9766 | * io_uring_register(). | |
9767 | */ | |
9768 | if (percpu_ref_is_dying(&ctx->refs)) | |
9769 | return -ENXIO; | |
9770 | ||
071698e1 | 9771 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9772 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9773 | |
05f3fb3c JA |
9774 | /* |
9775 | * Drop uring mutex before waiting for references to exit. If | |
9776 | * another thread is currently inside io_uring_enter() it might | |
9777 | * need to grab the uring_lock to make progress. If we hold it | |
9778 | * here across the drain wait, then we can deadlock. It's safe | |
9779 | * to drop the mutex here, since no new references will come in | |
9780 | * after we've killed the percpu ref. | |
9781 | */ | |
9782 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9783 | do { |
9784 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9785 | if (!ret) | |
9786 | break; | |
ed6930c9 JA |
9787 | ret = io_run_task_work_sig(); |
9788 | if (ret < 0) | |
9789 | break; | |
af9c1a44 JA |
9790 | } while (1); |
9791 | ||
05f3fb3c | 9792 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9793 | |
c150368b JA |
9794 | if (ret) { |
9795 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9796 | goto out_quiesce; |
9797 | } | |
9798 | } | |
9799 | ||
9800 | if (ctx->restricted) { | |
9801 | if (opcode >= IORING_REGISTER_LAST) { | |
9802 | ret = -EINVAL; | |
9803 | goto out; | |
9804 | } | |
9805 | ||
9806 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9807 | ret = -EACCES; | |
c150368b JA |
9808 | goto out; |
9809 | } | |
05f3fb3c | 9810 | } |
edafccee JA |
9811 | |
9812 | switch (opcode) { | |
9813 | case IORING_REGISTER_BUFFERS: | |
9814 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9815 | break; | |
9816 | case IORING_UNREGISTER_BUFFERS: | |
9817 | ret = -EINVAL; | |
9818 | if (arg || nr_args) | |
9819 | break; | |
9820 | ret = io_sqe_buffer_unregister(ctx); | |
9821 | break; | |
6b06314c JA |
9822 | case IORING_REGISTER_FILES: |
9823 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9824 | break; | |
9825 | case IORING_UNREGISTER_FILES: | |
9826 | ret = -EINVAL; | |
9827 | if (arg || nr_args) | |
9828 | break; | |
9829 | ret = io_sqe_files_unregister(ctx); | |
9830 | break; | |
c3a31e60 JA |
9831 | case IORING_REGISTER_FILES_UPDATE: |
9832 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9833 | break; | |
9b402849 | 9834 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9835 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9836 | ret = -EINVAL; |
9837 | if (nr_args != 1) | |
9838 | break; | |
9839 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9840 | if (ret) |
9841 | break; | |
9842 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9843 | ctx->eventfd_async = 1; | |
9844 | else | |
9845 | ctx->eventfd_async = 0; | |
9b402849 JA |
9846 | break; |
9847 | case IORING_UNREGISTER_EVENTFD: | |
9848 | ret = -EINVAL; | |
9849 | if (arg || nr_args) | |
9850 | break; | |
9851 | ret = io_eventfd_unregister(ctx); | |
9852 | break; | |
66f4af93 JA |
9853 | case IORING_REGISTER_PROBE: |
9854 | ret = -EINVAL; | |
9855 | if (!arg || nr_args > 256) | |
9856 | break; | |
9857 | ret = io_probe(ctx, arg, nr_args); | |
9858 | break; | |
071698e1 JA |
9859 | case IORING_REGISTER_PERSONALITY: |
9860 | ret = -EINVAL; | |
9861 | if (arg || nr_args) | |
9862 | break; | |
9863 | ret = io_register_personality(ctx); | |
9864 | break; | |
9865 | case IORING_UNREGISTER_PERSONALITY: | |
9866 | ret = -EINVAL; | |
9867 | if (arg) | |
9868 | break; | |
9869 | ret = io_unregister_personality(ctx, nr_args); | |
9870 | break; | |
7e84e1c7 SG |
9871 | case IORING_REGISTER_ENABLE_RINGS: |
9872 | ret = -EINVAL; | |
9873 | if (arg || nr_args) | |
9874 | break; | |
9875 | ret = io_register_enable_rings(ctx); | |
9876 | break; | |
21b55dbc SG |
9877 | case IORING_REGISTER_RESTRICTIONS: |
9878 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9879 | break; | |
edafccee JA |
9880 | default: |
9881 | ret = -EINVAL; | |
9882 | break; | |
9883 | } | |
9884 | ||
21b55dbc | 9885 | out: |
071698e1 | 9886 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9887 | /* bring the ctx back to life */ |
05f3fb3c | 9888 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9889 | out_quiesce: |
0f158b4c | 9890 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9891 | } |
edafccee JA |
9892 | return ret; |
9893 | } | |
9894 | ||
9895 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9896 | void __user *, arg, unsigned int, nr_args) | |
9897 | { | |
9898 | struct io_ring_ctx *ctx; | |
9899 | long ret = -EBADF; | |
9900 | struct fd f; | |
9901 | ||
9902 | f = fdget(fd); | |
9903 | if (!f.file) | |
9904 | return -EBADF; | |
9905 | ||
9906 | ret = -EOPNOTSUPP; | |
9907 | if (f.file->f_op != &io_uring_fops) | |
9908 | goto out_fput; | |
9909 | ||
9910 | ctx = f.file->private_data; | |
9911 | ||
9912 | mutex_lock(&ctx->uring_lock); | |
9913 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9914 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9915 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9916 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9917 | out_fput: |
9918 | fdput(f); | |
9919 | return ret; | |
9920 | } | |
9921 | ||
2b188cc1 JA |
9922 | static int __init io_uring_init(void) |
9923 | { | |
d7f62e82 SM |
9924 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9925 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9926 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9927 | } while (0) | |
9928 | ||
9929 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9930 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9931 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9932 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9933 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9934 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9935 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9936 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9937 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9938 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9939 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9940 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9941 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9942 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9943 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9944 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9945 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9946 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9947 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9948 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9949 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9950 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9951 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9952 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9953 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9954 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9955 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9956 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9957 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9958 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9959 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9960 | |
d3656344 | 9961 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9962 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9963 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9964 | return 0; | |
9965 | }; | |
9966 | __initcall(io_uring_init); |