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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
14 | * through a control-dependency in io_get_cqring (smp_store_release to | |
15 | * store head will do). Failure to do so could lead to reading invalid | |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
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; | |
08369246 XW |
248 | |
249 | unsigned sq_thread_idle; | |
534ca6d6 JA |
250 | }; |
251 | ||
2b188cc1 JA |
252 | struct io_ring_ctx { |
253 | struct { | |
254 | struct percpu_ref refs; | |
255 | } ____cacheline_aligned_in_smp; | |
256 | ||
257 | struct { | |
258 | unsigned int flags; | |
e1d85334 | 259 | unsigned int compat: 1; |
aad5d8da | 260 | unsigned int limit_mem: 1; |
e1d85334 RD |
261 | unsigned int cq_overflow_flushed: 1; |
262 | unsigned int drain_next: 1; | |
263 | unsigned int eventfd_async: 1; | |
21b55dbc | 264 | unsigned int restricted: 1; |
d9d05217 | 265 | unsigned int sqo_dead: 1; |
2b188cc1 | 266 | |
75b28aff HV |
267 | /* |
268 | * Ring buffer of indices into array of io_uring_sqe, which is | |
269 | * mmapped by the application using the IORING_OFF_SQES offset. | |
270 | * | |
271 | * This indirection could e.g. be used to assign fixed | |
272 | * io_uring_sqe entries to operations and only submit them to | |
273 | * the queue when needed. | |
274 | * | |
275 | * The kernel modifies neither the indices array nor the entries | |
276 | * array. | |
277 | */ | |
278 | u32 *sq_array; | |
2b188cc1 JA |
279 | unsigned cached_sq_head; |
280 | unsigned sq_entries; | |
281 | unsigned sq_mask; | |
6c271ce2 | 282 | unsigned sq_thread_idle; |
498ccd9e | 283 | unsigned cached_sq_dropped; |
2c3bac6d | 284 | unsigned cached_cq_overflow; |
ad3eb2c8 | 285 | unsigned long sq_check_overflow; |
de0617e4 JA |
286 | |
287 | struct list_head defer_list; | |
5262f567 | 288 | struct list_head timeout_list; |
1d7bb1d5 | 289 | struct list_head cq_overflow_list; |
fcb323cc | 290 | |
ad3eb2c8 | 291 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
292 | } ____cacheline_aligned_in_smp; |
293 | ||
206aefde JA |
294 | struct io_rings *rings; |
295 | ||
2b188cc1 | 296 | /* IO offload */ |
561fb04a | 297 | struct io_wq *io_wq; |
2aede0e4 JA |
298 | |
299 | /* | |
300 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
301 | * have access to the ->files | |
302 | */ | |
303 | struct task_struct *sqo_task; | |
304 | ||
305 | /* Only used for accounting purposes */ | |
306 | struct mm_struct *mm_account; | |
307 | ||
91d8f519 DZ |
308 | #ifdef CONFIG_BLK_CGROUP |
309 | struct cgroup_subsys_state *sqo_blkcg_css; | |
310 | #endif | |
311 | ||
534ca6d6 JA |
312 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
313 | ||
90554200 | 314 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 315 | struct list_head sqd_list; |
75b28aff | 316 | |
6b06314c JA |
317 | /* |
318 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
319 | * readers must ensure that ->refs is alive as long as the file* is | |
320 | * used. Only updated through io_uring_register(2). | |
321 | */ | |
05f3fb3c | 322 | struct fixed_file_data *file_data; |
6b06314c JA |
323 | unsigned nr_user_files; |
324 | ||
edafccee JA |
325 | /* if used, fixed mapped user buffers */ |
326 | unsigned nr_user_bufs; | |
327 | struct io_mapped_ubuf *user_bufs; | |
328 | ||
2b188cc1 JA |
329 | struct user_struct *user; |
330 | ||
0b8c0ec7 | 331 | const struct cred *creds; |
181e448d | 332 | |
4ea33a97 JA |
333 | #ifdef CONFIG_AUDIT |
334 | kuid_t loginuid; | |
335 | unsigned int sessionid; | |
336 | #endif | |
337 | ||
0f158b4c JA |
338 | struct completion ref_comp; |
339 | struct completion sq_thread_comp; | |
206aefde | 340 | |
0ddf92e8 JA |
341 | /* if all else fails... */ |
342 | struct io_kiocb *fallback_req; | |
343 | ||
206aefde JA |
344 | #if defined(CONFIG_UNIX) |
345 | struct socket *ring_sock; | |
346 | #endif | |
347 | ||
5a2e745d JA |
348 | struct idr io_buffer_idr; |
349 | ||
071698e1 JA |
350 | struct idr personality_idr; |
351 | ||
206aefde JA |
352 | struct { |
353 | unsigned cached_cq_tail; | |
354 | unsigned cq_entries; | |
355 | unsigned cq_mask; | |
356 | atomic_t cq_timeouts; | |
f010505b | 357 | unsigned cq_last_tm_flush; |
ad3eb2c8 | 358 | unsigned long cq_check_overflow; |
206aefde JA |
359 | struct wait_queue_head cq_wait; |
360 | struct fasync_struct *cq_fasync; | |
361 | struct eventfd_ctx *cq_ev_fd; | |
362 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
363 | |
364 | struct { | |
365 | struct mutex uring_lock; | |
366 | wait_queue_head_t wait; | |
367 | } ____cacheline_aligned_in_smp; | |
368 | ||
369 | struct { | |
370 | spinlock_t completion_lock; | |
e94f141b | 371 | |
def596e9 | 372 | /* |
540e32a0 | 373 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
374 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
375 | * For SQPOLL, only the single threaded io_sq_thread() will | |
376 | * manipulate the list, hence no extra locking is needed there. | |
377 | */ | |
540e32a0 | 378 | struct list_head iopoll_list; |
78076bb6 JA |
379 | struct hlist_head *cancel_hash; |
380 | unsigned cancel_hash_bits; | |
e94f141b | 381 | bool poll_multi_file; |
31b51510 | 382 | |
fcb323cc JA |
383 | spinlock_t inflight_lock; |
384 | struct list_head inflight_list; | |
2b188cc1 | 385 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 386 | |
4a38aed2 JA |
387 | struct delayed_work file_put_work; |
388 | struct llist_head file_put_llist; | |
389 | ||
85faa7b8 | 390 | struct work_struct exit_work; |
21b55dbc | 391 | struct io_restriction restrictions; |
2b188cc1 JA |
392 | }; |
393 | ||
09bb8394 JA |
394 | /* |
395 | * First field must be the file pointer in all the | |
396 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
397 | */ | |
221c5eb2 JA |
398 | struct io_poll_iocb { |
399 | struct file *file; | |
018043be | 400 | struct wait_queue_head *head; |
221c5eb2 | 401 | __poll_t events; |
8c838788 | 402 | bool done; |
221c5eb2 | 403 | bool canceled; |
392edb45 | 404 | struct wait_queue_entry wait; |
221c5eb2 JA |
405 | }; |
406 | ||
018043be PB |
407 | struct io_poll_remove { |
408 | struct file *file; | |
409 | u64 addr; | |
410 | }; | |
411 | ||
b5dba59e JA |
412 | struct io_close { |
413 | struct file *file; | |
414 | struct file *put_file; | |
415 | int fd; | |
416 | }; | |
417 | ||
ad8a48ac JA |
418 | struct io_timeout_data { |
419 | struct io_kiocb *req; | |
420 | struct hrtimer timer; | |
421 | struct timespec64 ts; | |
422 | enum hrtimer_mode mode; | |
423 | }; | |
424 | ||
8ed8d3c3 JA |
425 | struct io_accept { |
426 | struct file *file; | |
427 | struct sockaddr __user *addr; | |
428 | int __user *addr_len; | |
429 | int flags; | |
09952e3e | 430 | unsigned long nofile; |
8ed8d3c3 JA |
431 | }; |
432 | ||
433 | struct io_sync { | |
434 | struct file *file; | |
435 | loff_t len; | |
436 | loff_t off; | |
437 | int flags; | |
d63d1b5e | 438 | int mode; |
8ed8d3c3 JA |
439 | }; |
440 | ||
fbf23849 JA |
441 | struct io_cancel { |
442 | struct file *file; | |
443 | u64 addr; | |
444 | }; | |
445 | ||
b29472ee JA |
446 | struct io_timeout { |
447 | struct file *file; | |
bfe68a22 PB |
448 | u32 off; |
449 | u32 target_seq; | |
135fcde8 | 450 | struct list_head list; |
90cd7e42 PB |
451 | /* head of the link, used by linked timeouts only */ |
452 | struct io_kiocb *head; | |
b29472ee JA |
453 | }; |
454 | ||
0bdf7a2d PB |
455 | struct io_timeout_rem { |
456 | struct file *file; | |
457 | u64 addr; | |
9c8e11b3 PB |
458 | |
459 | /* timeout update */ | |
460 | struct timespec64 ts; | |
461 | u32 flags; | |
0bdf7a2d PB |
462 | }; |
463 | ||
9adbd45d JA |
464 | struct io_rw { |
465 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
466 | struct kiocb kiocb; | |
467 | u64 addr; | |
468 | u64 len; | |
469 | }; | |
470 | ||
3fbb51c1 JA |
471 | struct io_connect { |
472 | struct file *file; | |
473 | struct sockaddr __user *addr; | |
474 | int addr_len; | |
475 | }; | |
476 | ||
e47293fd JA |
477 | struct io_sr_msg { |
478 | struct file *file; | |
fddaface | 479 | union { |
270a5940 | 480 | struct user_msghdr __user *umsg; |
fddaface JA |
481 | void __user *buf; |
482 | }; | |
e47293fd | 483 | int msg_flags; |
bcda7baa | 484 | int bgid; |
fddaface | 485 | size_t len; |
bcda7baa | 486 | struct io_buffer *kbuf; |
e47293fd JA |
487 | }; |
488 | ||
15b71abe JA |
489 | struct io_open { |
490 | struct file *file; | |
491 | int dfd; | |
15b71abe | 492 | struct filename *filename; |
c12cedf2 | 493 | struct open_how how; |
4022e7af | 494 | unsigned long nofile; |
15b71abe JA |
495 | }; |
496 | ||
05f3fb3c JA |
497 | struct io_files_update { |
498 | struct file *file; | |
499 | u64 arg; | |
500 | u32 nr_args; | |
501 | u32 offset; | |
502 | }; | |
503 | ||
4840e418 JA |
504 | struct io_fadvise { |
505 | struct file *file; | |
506 | u64 offset; | |
507 | u32 len; | |
508 | u32 advice; | |
509 | }; | |
510 | ||
c1ca757b JA |
511 | struct io_madvise { |
512 | struct file *file; | |
513 | u64 addr; | |
514 | u32 len; | |
515 | u32 advice; | |
516 | }; | |
517 | ||
3e4827b0 JA |
518 | struct io_epoll { |
519 | struct file *file; | |
520 | int epfd; | |
521 | int op; | |
522 | int fd; | |
523 | struct epoll_event event; | |
e47293fd JA |
524 | }; |
525 | ||
7d67af2c PB |
526 | struct io_splice { |
527 | struct file *file_out; | |
528 | struct file *file_in; | |
529 | loff_t off_out; | |
530 | loff_t off_in; | |
531 | u64 len; | |
532 | unsigned int flags; | |
533 | }; | |
534 | ||
ddf0322d JA |
535 | struct io_provide_buf { |
536 | struct file *file; | |
537 | __u64 addr; | |
538 | __s32 len; | |
539 | __u32 bgid; | |
540 | __u16 nbufs; | |
541 | __u16 bid; | |
542 | }; | |
543 | ||
1d9e1288 BM |
544 | struct io_statx { |
545 | struct file *file; | |
546 | int dfd; | |
547 | unsigned int mask; | |
548 | unsigned int flags; | |
e62753e4 | 549 | const char __user *filename; |
1d9e1288 BM |
550 | struct statx __user *buffer; |
551 | }; | |
552 | ||
36f4fa68 JA |
553 | struct io_shutdown { |
554 | struct file *file; | |
555 | int how; | |
556 | }; | |
557 | ||
80a261fd JA |
558 | struct io_rename { |
559 | struct file *file; | |
560 | int old_dfd; | |
561 | int new_dfd; | |
562 | struct filename *oldpath; | |
563 | struct filename *newpath; | |
564 | int flags; | |
565 | }; | |
566 | ||
14a1143b JA |
567 | struct io_unlink { |
568 | struct file *file; | |
569 | int dfd; | |
570 | int flags; | |
571 | struct filename *filename; | |
572 | }; | |
573 | ||
3ca405eb PB |
574 | struct io_completion { |
575 | struct file *file; | |
576 | struct list_head list; | |
0f7e466b | 577 | int cflags; |
3ca405eb PB |
578 | }; |
579 | ||
f499a021 JA |
580 | struct io_async_connect { |
581 | struct sockaddr_storage address; | |
582 | }; | |
583 | ||
03b1230c JA |
584 | struct io_async_msghdr { |
585 | struct iovec fast_iov[UIO_FASTIOV]; | |
586 | struct iovec *iov; | |
587 | struct sockaddr __user *uaddr; | |
588 | struct msghdr msg; | |
b537916c | 589 | struct sockaddr_storage addr; |
03b1230c JA |
590 | }; |
591 | ||
f67676d1 JA |
592 | struct io_async_rw { |
593 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
594 | const struct iovec *free_iovec; |
595 | struct iov_iter iter; | |
227c0c96 | 596 | size_t bytes_done; |
bcf5a063 | 597 | struct wait_page_queue wpq; |
f67676d1 JA |
598 | }; |
599 | ||
6b47ee6e PB |
600 | enum { |
601 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
602 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
603 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
604 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
605 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 606 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 607 | |
6b47ee6e PB |
608 | REQ_F_FAIL_LINK_BIT, |
609 | REQ_F_INFLIGHT_BIT, | |
610 | REQ_F_CUR_POS_BIT, | |
611 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 612 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 613 | REQ_F_ISREG_BIT, |
99bc4c38 | 614 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 615 | REQ_F_POLLED_BIT, |
bcda7baa | 616 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 617 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 618 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 619 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
620 | |
621 | /* not a real bit, just to check we're not overflowing the space */ | |
622 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
623 | }; |
624 | ||
625 | enum { | |
626 | /* ctx owns file */ | |
627 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
628 | /* drain existing IO first */ | |
629 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
630 | /* linked sqes */ | |
631 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
632 | /* doesn't sever on completion < 0 */ | |
633 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
634 | /* IOSQE_ASYNC */ | |
635 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
636 | /* IOSQE_BUFFER_SELECT */ |
637 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 638 | |
6b47ee6e PB |
639 | /* fail rest of links */ |
640 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
641 | /* on inflight list */ | |
642 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
643 | /* read/write uses file position */ | |
644 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
645 | /* must not punt to workers */ | |
646 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 647 | /* has or had linked timeout */ |
6b47ee6e | 648 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
649 | /* regular file */ |
650 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
651 | /* needs cleanup */ |
652 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
653 | /* already went through poll handler */ |
654 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
655 | /* buffer already selected */ |
656 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
657 | /* doesn't need file table for this request */ |
658 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
659 | /* io_wq_work is initialized */ |
660 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
661 | /* linked timeout is active, i.e. prepared by link's head */ |
662 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
663 | }; |
664 | ||
665 | struct async_poll { | |
666 | struct io_poll_iocb poll; | |
807abcb0 | 667 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
668 | }; |
669 | ||
09bb8394 JA |
670 | /* |
671 | * NOTE! Each of the iocb union members has the file pointer | |
672 | * as the first entry in their struct definition. So you can | |
673 | * access the file pointer through any of the sub-structs, | |
674 | * or directly as just 'ki_filp' in this struct. | |
675 | */ | |
2b188cc1 | 676 | struct io_kiocb { |
221c5eb2 | 677 | union { |
09bb8394 | 678 | struct file *file; |
9adbd45d | 679 | struct io_rw rw; |
221c5eb2 | 680 | struct io_poll_iocb poll; |
018043be | 681 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
682 | struct io_accept accept; |
683 | struct io_sync sync; | |
fbf23849 | 684 | struct io_cancel cancel; |
b29472ee | 685 | struct io_timeout timeout; |
0bdf7a2d | 686 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 687 | struct io_connect connect; |
e47293fd | 688 | struct io_sr_msg sr_msg; |
15b71abe | 689 | struct io_open open; |
b5dba59e | 690 | struct io_close close; |
05f3fb3c | 691 | struct io_files_update files_update; |
4840e418 | 692 | struct io_fadvise fadvise; |
c1ca757b | 693 | struct io_madvise madvise; |
3e4827b0 | 694 | struct io_epoll epoll; |
7d67af2c | 695 | struct io_splice splice; |
ddf0322d | 696 | struct io_provide_buf pbuf; |
1d9e1288 | 697 | struct io_statx statx; |
36f4fa68 | 698 | struct io_shutdown shutdown; |
80a261fd | 699 | struct io_rename rename; |
14a1143b | 700 | struct io_unlink unlink; |
3ca405eb PB |
701 | /* use only after cleaning per-op data, see io_clean_op() */ |
702 | struct io_completion compl; | |
221c5eb2 | 703 | }; |
2b188cc1 | 704 | |
e8c2bc1f JA |
705 | /* opcode allocated if it needs to store data for async defer */ |
706 | void *async_data; | |
d625c6ee | 707 | u8 opcode; |
65a6543d XW |
708 | /* polled IO has completed */ |
709 | u8 iopoll_completed; | |
2b188cc1 | 710 | |
4f4eeba8 | 711 | u16 buf_index; |
9cf7c104 | 712 | u32 result; |
4f4eeba8 | 713 | |
010e8e6b PB |
714 | struct io_ring_ctx *ctx; |
715 | unsigned int flags; | |
716 | refcount_t refs; | |
717 | struct task_struct *task; | |
718 | u64 user_data; | |
d7718a9d | 719 | |
f2f87370 | 720 | struct io_kiocb *link; |
0415767e | 721 | struct percpu_ref *fixed_file_refs; |
fcb323cc | 722 | |
d21ffe7e PB |
723 | /* |
724 | * 1. used with ctx->iopoll_list with reads/writes | |
725 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
726 | */ | |
010e8e6b | 727 | struct list_head inflight_entry; |
010e8e6b PB |
728 | struct callback_head task_work; |
729 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
730 | struct hlist_node hash_node; | |
731 | struct async_poll *apoll; | |
732 | struct io_wq_work work; | |
2b188cc1 | 733 | }; |
05589553 | 734 | |
27dc8338 PB |
735 | struct io_defer_entry { |
736 | struct list_head list; | |
737 | struct io_kiocb *req; | |
9cf7c104 | 738 | u32 seq; |
2b188cc1 JA |
739 | }; |
740 | ||
def596e9 | 741 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 742 | |
013538bd JA |
743 | struct io_comp_state { |
744 | unsigned int nr; | |
745 | struct list_head list; | |
746 | struct io_ring_ctx *ctx; | |
747 | }; | |
748 | ||
9a56a232 JA |
749 | struct io_submit_state { |
750 | struct blk_plug plug; | |
751 | ||
2579f913 JA |
752 | /* |
753 | * io_kiocb alloc cache | |
754 | */ | |
755 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 756 | unsigned int free_reqs; |
2579f913 | 757 | |
27926b68 JA |
758 | bool plug_started; |
759 | ||
013538bd JA |
760 | /* |
761 | * Batch completion logic | |
762 | */ | |
763 | struct io_comp_state comp; | |
764 | ||
9a56a232 JA |
765 | /* |
766 | * File reference cache | |
767 | */ | |
768 | struct file *file; | |
769 | unsigned int fd; | |
6e1271e6 | 770 | unsigned int file_refs; |
9a56a232 JA |
771 | unsigned int ios_left; |
772 | }; | |
773 | ||
d3656344 | 774 | struct io_op_def { |
d3656344 JA |
775 | /* needs req->file assigned */ |
776 | unsigned needs_file : 1; | |
fd2206e4 JA |
777 | /* don't fail if file grab fails */ |
778 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
779 | /* hash wq insertion if file is a regular file */ |
780 | unsigned hash_reg_file : 1; | |
781 | /* unbound wq insertion if file is a non-regular file */ | |
782 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
783 | /* opcode is not supported by this kernel */ |
784 | unsigned not_supported : 1; | |
8a72758c JA |
785 | /* set if opcode supports polled "wait" */ |
786 | unsigned pollin : 1; | |
787 | unsigned pollout : 1; | |
bcda7baa JA |
788 | /* op supports buffer selection */ |
789 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
790 | /* must always have async data allocated */ |
791 | unsigned needs_async_data : 1; | |
27926b68 JA |
792 | /* should block plug */ |
793 | unsigned plug : 1; | |
e8c2bc1f JA |
794 | /* size of async data needed, if any */ |
795 | unsigned short async_size; | |
0f203765 | 796 | unsigned work_flags; |
d3656344 JA |
797 | }; |
798 | ||
0918682b | 799 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
800 | [IORING_OP_NOP] = {}, |
801 | [IORING_OP_READV] = { | |
d3656344 JA |
802 | .needs_file = 1, |
803 | .unbound_nonreg_file = 1, | |
8a72758c | 804 | .pollin = 1, |
4d954c25 | 805 | .buffer_select = 1, |
e8c2bc1f | 806 | .needs_async_data = 1, |
27926b68 | 807 | .plug = 1, |
e8c2bc1f | 808 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 809 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 810 | }, |
0463b6c5 | 811 | [IORING_OP_WRITEV] = { |
d3656344 JA |
812 | .needs_file = 1, |
813 | .hash_reg_file = 1, | |
814 | .unbound_nonreg_file = 1, | |
8a72758c | 815 | .pollout = 1, |
e8c2bc1f | 816 | .needs_async_data = 1, |
27926b68 | 817 | .plug = 1, |
e8c2bc1f | 818 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
819 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
820 | IO_WQ_WORK_FSIZE, | |
d3656344 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_FSYNC] = { |
d3656344 | 823 | .needs_file = 1, |
0f203765 | 824 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 825 | }, |
0463b6c5 | 826 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
827 | .needs_file = 1, |
828 | .unbound_nonreg_file = 1, | |
8a72758c | 829 | .pollin = 1, |
27926b68 | 830 | .plug = 1, |
e8c2bc1f | 831 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 832 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 833 | }, |
0463b6c5 | 834 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
835 | .needs_file = 1, |
836 | .hash_reg_file = 1, | |
837 | .unbound_nonreg_file = 1, | |
8a72758c | 838 | .pollout = 1, |
27926b68 | 839 | .plug = 1, |
e8c2bc1f | 840 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
841 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
842 | IO_WQ_WORK_MM, | |
d3656344 | 843 | }, |
0463b6c5 | 844 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
845 | .needs_file = 1, |
846 | .unbound_nonreg_file = 1, | |
847 | }, | |
0463b6c5 PB |
848 | [IORING_OP_POLL_REMOVE] = {}, |
849 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 850 | .needs_file = 1, |
0f203765 | 851 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 852 | }, |
0463b6c5 | 853 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
854 | .needs_file = 1, |
855 | .unbound_nonreg_file = 1, | |
8a72758c | 856 | .pollout = 1, |
e8c2bc1f JA |
857 | .needs_async_data = 1, |
858 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 859 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 860 | }, |
0463b6c5 | 861 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
862 | .needs_file = 1, |
863 | .unbound_nonreg_file = 1, | |
8a72758c | 864 | .pollin = 1, |
52de1fe1 | 865 | .buffer_select = 1, |
e8c2bc1f JA |
866 | .needs_async_data = 1, |
867 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 868 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 869 | }, |
0463b6c5 | 870 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
871 | .needs_async_data = 1, |
872 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 873 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 874 | }, |
9c8e11b3 PB |
875 | [IORING_OP_TIMEOUT_REMOVE] = { |
876 | /* used by timeout updates' prep() */ | |
877 | .work_flags = IO_WQ_WORK_MM, | |
878 | }, | |
0463b6c5 | 879 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
880 | .needs_file = 1, |
881 | .unbound_nonreg_file = 1, | |
8a72758c | 882 | .pollin = 1, |
0f203765 | 883 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 884 | }, |
0463b6c5 PB |
885 | [IORING_OP_ASYNC_CANCEL] = {}, |
886 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
887 | .needs_async_data = 1, |
888 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 889 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 890 | }, |
0463b6c5 | 891 | [IORING_OP_CONNECT] = { |
d3656344 JA |
892 | .needs_file = 1, |
893 | .unbound_nonreg_file = 1, | |
8a72758c | 894 | .pollout = 1, |
e8c2bc1f JA |
895 | .needs_async_data = 1, |
896 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 897 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 898 | }, |
0463b6c5 | 899 | [IORING_OP_FALLOCATE] = { |
d3656344 | 900 | .needs_file = 1, |
69228338 | 901 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 902 | }, |
0463b6c5 | 903 | [IORING_OP_OPENAT] = { |
0f203765 | 904 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 905 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 906 | }, |
0463b6c5 | 907 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
908 | .needs_file = 1, |
909 | .needs_file_no_error = 1, | |
0f203765 | 910 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 911 | }, |
0463b6c5 | 912 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 913 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 914 | }, |
0463b6c5 | 915 | [IORING_OP_STATX] = { |
0f203765 JA |
916 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
917 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 918 | }, |
0463b6c5 | 919 | [IORING_OP_READ] = { |
3a6820f2 JA |
920 | .needs_file = 1, |
921 | .unbound_nonreg_file = 1, | |
8a72758c | 922 | .pollin = 1, |
bcda7baa | 923 | .buffer_select = 1, |
27926b68 | 924 | .plug = 1, |
e8c2bc1f | 925 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 926 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 927 | }, |
0463b6c5 | 928 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
929 | .needs_file = 1, |
930 | .unbound_nonreg_file = 1, | |
8a72758c | 931 | .pollout = 1, |
27926b68 | 932 | .plug = 1, |
e8c2bc1f | 933 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
934 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
935 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 936 | }, |
0463b6c5 | 937 | [IORING_OP_FADVISE] = { |
4840e418 | 938 | .needs_file = 1, |
0f203765 | 939 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 940 | }, |
0463b6c5 | 941 | [IORING_OP_MADVISE] = { |
0f203765 | 942 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 943 | }, |
0463b6c5 | 944 | [IORING_OP_SEND] = { |
fddaface JA |
945 | .needs_file = 1, |
946 | .unbound_nonreg_file = 1, | |
8a72758c | 947 | .pollout = 1, |
0f203765 | 948 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 949 | }, |
0463b6c5 | 950 | [IORING_OP_RECV] = { |
fddaface JA |
951 | .needs_file = 1, |
952 | .unbound_nonreg_file = 1, | |
8a72758c | 953 | .pollin = 1, |
bcda7baa | 954 | .buffer_select = 1, |
0f203765 | 955 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 956 | }, |
0463b6c5 | 957 | [IORING_OP_OPENAT2] = { |
0f203765 | 958 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 959 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 960 | }, |
3e4827b0 JA |
961 | [IORING_OP_EPOLL_CTL] = { |
962 | .unbound_nonreg_file = 1, | |
0f203765 | 963 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 964 | }, |
7d67af2c PB |
965 | [IORING_OP_SPLICE] = { |
966 | .needs_file = 1, | |
967 | .hash_reg_file = 1, | |
968 | .unbound_nonreg_file = 1, | |
0f203765 | 969 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
970 | }, |
971 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 972 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
973 | [IORING_OP_TEE] = { |
974 | .needs_file = 1, | |
975 | .hash_reg_file = 1, | |
976 | .unbound_nonreg_file = 1, | |
977 | }, | |
36f4fa68 JA |
978 | [IORING_OP_SHUTDOWN] = { |
979 | .needs_file = 1, | |
980 | }, | |
80a261fd JA |
981 | [IORING_OP_RENAMEAT] = { |
982 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
983 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
984 | }, | |
14a1143b JA |
985 | [IORING_OP_UNLINKAT] = { |
986 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
987 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
988 | }, | |
d3656344 JA |
989 | }; |
990 | ||
2e0464d4 BM |
991 | enum io_mem_account { |
992 | ACCT_LOCKED, | |
993 | ACCT_PINNED, | |
994 | }; | |
995 | ||
90df0853 PB |
996 | static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
997 | struct task_struct *task); | |
998 | ||
1ffc5422 PB |
999 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node); |
1000 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( | |
1001 | struct io_ring_ctx *ctx); | |
1002 | ||
81b68a5c PB |
1003 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
1004 | struct io_comp_state *cs); | |
78e19bbe | 1005 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 1006 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1007 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 1008 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 1009 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 1010 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 1011 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
1012 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
1013 | struct io_uring_files_update *ip, | |
1014 | unsigned nr_args); | |
3ca405eb | 1015 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1016 | static struct file *io_file_get(struct io_submit_state *state, |
1017 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 1018 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 1019 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 1020 | |
b63534c4 JA |
1021 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
1022 | struct iovec **iovec, struct iov_iter *iter, | |
1023 | bool needs_lock); | |
ff6165b2 JA |
1024 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1025 | const struct iovec *fast_iov, | |
227c0c96 | 1026 | struct iov_iter *iter, bool force); |
9d5c8190 | 1027 | static void io_req_drop_files(struct io_kiocb *req); |
907d1df3 | 1028 | static void io_req_task_queue(struct io_kiocb *req); |
de0617e4 | 1029 | |
2b188cc1 JA |
1030 | static struct kmem_cache *req_cachep; |
1031 | ||
0918682b | 1032 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1033 | |
1034 | struct sock *io_uring_get_socket(struct file *file) | |
1035 | { | |
1036 | #if defined(CONFIG_UNIX) | |
1037 | if (file->f_op == &io_uring_fops) { | |
1038 | struct io_ring_ctx *ctx = file->private_data; | |
1039 | ||
1040 | return ctx->ring_sock->sk; | |
1041 | } | |
1042 | #endif | |
1043 | return NULL; | |
1044 | } | |
1045 | EXPORT_SYMBOL(io_uring_get_socket); | |
1046 | ||
f2f87370 PB |
1047 | #define io_for_each_link(pos, head) \ |
1048 | for (pos = (head); pos; pos = pos->link) | |
1049 | ||
3ca405eb PB |
1050 | static inline void io_clean_op(struct io_kiocb *req) |
1051 | { | |
9d5c8190 | 1052 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
3ca405eb PB |
1053 | __io_clean_op(req); |
1054 | } | |
1055 | ||
36f72fe2 PB |
1056 | static inline void io_set_resource_node(struct io_kiocb *req) |
1057 | { | |
1058 | struct io_ring_ctx *ctx = req->ctx; | |
1059 | ||
1060 | if (!req->fixed_file_refs) { | |
1061 | req->fixed_file_refs = &ctx->file_data->node->refs; | |
1062 | percpu_ref_get(req->fixed_file_refs); | |
1063 | } | |
1064 | } | |
1065 | ||
08d23634 PB |
1066 | static bool io_match_task(struct io_kiocb *head, |
1067 | struct task_struct *task, | |
1068 | struct files_struct *files) | |
1069 | { | |
1070 | struct io_kiocb *req; | |
1071 | ||
84965ff8 JA |
1072 | if (task && head->task != task) { |
1073 | /* in terms of cancelation, always match if req task is dead */ | |
1074 | if (head->task->flags & PF_EXITING) | |
1075 | return true; | |
08d23634 | 1076 | return false; |
84965ff8 | 1077 | } |
08d23634 PB |
1078 | if (!files) |
1079 | return true; | |
1080 | ||
1081 | io_for_each_link(req, head) { | |
02a13674 JA |
1082 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1083 | continue; | |
1084 | if (req->file && req->file->f_op == &io_uring_fops) | |
1085 | return true; | |
1086 | if ((req->work.flags & IO_WQ_WORK_FILES) && | |
08d23634 PB |
1087 | req->work.identity->files == files) |
1088 | return true; | |
1089 | } | |
1090 | return false; | |
1091 | } | |
1092 | ||
28cea78a | 1093 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1094 | { |
28cea78a | 1095 | struct files_struct *files = current->files; |
c40f6379 JA |
1096 | struct mm_struct *mm = current->mm; |
1097 | ||
1098 | if (mm) { | |
1099 | kthread_unuse_mm(mm); | |
1100 | mmput(mm); | |
4b70cf9d | 1101 | current->mm = NULL; |
c40f6379 | 1102 | } |
28cea78a JA |
1103 | if (files) { |
1104 | struct nsproxy *nsproxy = current->nsproxy; | |
1105 | ||
1106 | task_lock(current); | |
1107 | current->files = NULL; | |
1108 | current->nsproxy = NULL; | |
1109 | task_unlock(current); | |
1110 | put_files_struct(files); | |
1111 | put_nsproxy(nsproxy); | |
1112 | } | |
1113 | } | |
1114 | ||
1a38ffc9 | 1115 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a | 1116 | { |
621fadc2 PB |
1117 | if (current->flags & PF_EXITING) |
1118 | return -EFAULT; | |
1119 | ||
28cea78a JA |
1120 | if (!current->files) { |
1121 | struct files_struct *files; | |
1122 | struct nsproxy *nsproxy; | |
1123 | ||
1124 | task_lock(ctx->sqo_task); | |
1125 | files = ctx->sqo_task->files; | |
1126 | if (!files) { | |
1127 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1128 | return -EOWNERDEAD; |
28cea78a JA |
1129 | } |
1130 | atomic_inc(&files->count); | |
1131 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1132 | nsproxy = ctx->sqo_task->nsproxy; | |
1133 | task_unlock(ctx->sqo_task); | |
1134 | ||
1135 | task_lock(current); | |
1136 | current->files = files; | |
1137 | current->nsproxy = nsproxy; | |
1138 | task_unlock(current); | |
1139 | } | |
1a38ffc9 | 1140 | return 0; |
c40f6379 JA |
1141 | } |
1142 | ||
1143 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1144 | { | |
4b70cf9d JA |
1145 | struct mm_struct *mm; |
1146 | ||
621fadc2 PB |
1147 | if (current->flags & PF_EXITING) |
1148 | return -EFAULT; | |
4b70cf9d JA |
1149 | if (current->mm) |
1150 | return 0; | |
1151 | ||
1152 | /* Should never happen */ | |
1153 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1154 | return -EFAULT; | |
1155 | ||
1156 | task_lock(ctx->sqo_task); | |
1157 | mm = ctx->sqo_task->mm; | |
1158 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1159 | mm = NULL; | |
1160 | task_unlock(ctx->sqo_task); | |
1161 | ||
1162 | if (mm) { | |
1163 | kthread_use_mm(mm); | |
1164 | return 0; | |
c40f6379 JA |
1165 | } |
1166 | ||
4b70cf9d | 1167 | return -EFAULT; |
c40f6379 JA |
1168 | } |
1169 | ||
28cea78a JA |
1170 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1171 | struct io_kiocb *req) | |
c40f6379 | 1172 | { |
28cea78a | 1173 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1174 | int ret; |
28cea78a JA |
1175 | |
1176 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1177 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1178 | if (unlikely(ret)) |
1179 | return ret; | |
1180 | } | |
1181 | ||
1a38ffc9 PB |
1182 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1183 | ret = __io_sq_thread_acquire_files(ctx); | |
1184 | if (unlikely(ret)) | |
1185 | return ret; | |
1186 | } | |
28cea78a JA |
1187 | |
1188 | return 0; | |
c40f6379 JA |
1189 | } |
1190 | ||
91d8f519 DZ |
1191 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1192 | struct cgroup_subsys_state **cur_css) | |
1193 | ||
1194 | { | |
1195 | #ifdef CONFIG_BLK_CGROUP | |
1196 | /* puts the old one when swapping */ | |
1197 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1198 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1199 | *cur_css = ctx->sqo_blkcg_css; | |
1200 | } | |
1201 | #endif | |
1202 | } | |
1203 | ||
1204 | static void io_sq_thread_unassociate_blkcg(void) | |
1205 | { | |
1206 | #ifdef CONFIG_BLK_CGROUP | |
1207 | kthread_associate_blkcg(NULL); | |
1208 | #endif | |
1209 | } | |
1210 | ||
c40f6379 JA |
1211 | static inline void req_set_fail_links(struct io_kiocb *req) |
1212 | { | |
1213 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1214 | req->flags |= REQ_F_FAIL_LINK; | |
1215 | } | |
4a38aed2 | 1216 | |
1e6fa521 JA |
1217 | /* |
1218 | * None of these are dereferenced, they are simply used to check if any of | |
1219 | * them have changed. If we're under current and check they are still the | |
1220 | * same, we're fine to grab references to them for actual out-of-line use. | |
1221 | */ | |
1222 | static void io_init_identity(struct io_identity *id) | |
1223 | { | |
1224 | id->files = current->files; | |
1225 | id->mm = current->mm; | |
1226 | #ifdef CONFIG_BLK_CGROUP | |
1227 | rcu_read_lock(); | |
1228 | id->blkcg_css = blkcg_css(); | |
1229 | rcu_read_unlock(); | |
1230 | #endif | |
1231 | id->creds = current_cred(); | |
1232 | id->nsproxy = current->nsproxy; | |
1233 | id->fs = current->fs; | |
1234 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1235 | #ifdef CONFIG_AUDIT |
1236 | id->loginuid = current->loginuid; | |
1237 | id->sessionid = current->sessionid; | |
1238 | #endif | |
1e6fa521 JA |
1239 | refcount_set(&id->count, 1); |
1240 | } | |
1241 | ||
ec99ca6c PB |
1242 | static inline void __io_req_init_async(struct io_kiocb *req) |
1243 | { | |
1244 | memset(&req->work, 0, sizeof(req->work)); | |
1245 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1246 | } | |
1247 | ||
7cdaf587 XW |
1248 | /* |
1249 | * Note: must call io_req_init_async() for the first time you | |
1250 | * touch any members of io_wq_work. | |
1251 | */ | |
1252 | static inline void io_req_init_async(struct io_kiocb *req) | |
1253 | { | |
500a373d JA |
1254 | struct io_uring_task *tctx = current->io_uring; |
1255 | ||
7cdaf587 XW |
1256 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1257 | return; | |
1258 | ||
ec99ca6c | 1259 | __io_req_init_async(req); |
500a373d JA |
1260 | |
1261 | /* Grab a ref if this isn't our static identity */ | |
1262 | req->work.identity = tctx->identity; | |
1263 | if (tctx->identity != &tctx->__identity) | |
1264 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1265 | } |
1266 | ||
0cdaf760 PB |
1267 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1268 | { | |
1269 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1270 | } | |
1271 | ||
2b188cc1 JA |
1272 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1273 | { | |
1274 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1275 | ||
0f158b4c | 1276 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1277 | } |
1278 | ||
8eb7e2d0 PB |
1279 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1280 | { | |
1281 | return !req->timeout.off; | |
1282 | } | |
1283 | ||
2b188cc1 JA |
1284 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1285 | { | |
1286 | struct io_ring_ctx *ctx; | |
78076bb6 | 1287 | int hash_bits; |
2b188cc1 JA |
1288 | |
1289 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1290 | if (!ctx) | |
1291 | return NULL; | |
1292 | ||
0ddf92e8 JA |
1293 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1294 | if (!ctx->fallback_req) | |
1295 | goto err; | |
1296 | ||
78076bb6 JA |
1297 | /* |
1298 | * Use 5 bits less than the max cq entries, that should give us around | |
1299 | * 32 entries per hash list if totally full and uniformly spread. | |
1300 | */ | |
1301 | hash_bits = ilog2(p->cq_entries); | |
1302 | hash_bits -= 5; | |
1303 | if (hash_bits <= 0) | |
1304 | hash_bits = 1; | |
1305 | ctx->cancel_hash_bits = hash_bits; | |
1306 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1307 | GFP_KERNEL); | |
1308 | if (!ctx->cancel_hash) | |
1309 | goto err; | |
1310 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1311 | ||
21482896 | 1312 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1313 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1314 | goto err; | |
2b188cc1 JA |
1315 | |
1316 | ctx->flags = p->flags; | |
90554200 | 1317 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1318 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1319 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1320 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1321 | init_completion(&ctx->ref_comp); |
1322 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1323 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1324 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1325 | mutex_init(&ctx->uring_lock); |
1326 | init_waitqueue_head(&ctx->wait); | |
1327 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1328 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1329 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1330 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1331 | spin_lock_init(&ctx->inflight_lock); |
1332 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1333 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1334 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1335 | return ctx; |
206aefde | 1336 | err: |
0ddf92e8 JA |
1337 | if (ctx->fallback_req) |
1338 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1339 | kfree(ctx->cancel_hash); |
206aefde JA |
1340 | kfree(ctx); |
1341 | return NULL; | |
2b188cc1 JA |
1342 | } |
1343 | ||
9cf7c104 | 1344 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1345 | { |
2bc9930e JA |
1346 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1347 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1348 | |
9cf7c104 | 1349 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1350 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1351 | } |
de0617e4 | 1352 | |
9d858b21 | 1353 | return false; |
de0617e4 JA |
1354 | } |
1355 | ||
de0617e4 | 1356 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1357 | { |
75b28aff | 1358 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1359 | |
07910158 PB |
1360 | /* order cqe stores with ring update */ |
1361 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 JA |
1362 | } |
1363 | ||
5c3462cf | 1364 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1365 | { |
500a373d | 1366 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1367 | return; |
1368 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1369 | kfree(req->work.identity); | |
1370 | } | |
1371 | ||
4edf20f9 | 1372 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1373 | { |
7cdaf587 | 1374 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1375 | return; |
51a4cc11 JA |
1376 | |
1377 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1378 | |
dfead8a8 | 1379 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1380 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1381 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1382 | } |
91d8f519 | 1383 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1384 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1385 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1386 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1387 | } | |
91d8f519 | 1388 | #endif |
dfead8a8 | 1389 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1390 | put_cred(req->work.identity->creds); |
dfead8a8 | 1391 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1392 | } |
dfead8a8 | 1393 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1394 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1395 | |
98447d65 | 1396 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1397 | if (--fs->users) |
1398 | fs = NULL; | |
98447d65 | 1399 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1400 | if (fs) |
1401 | free_fs_struct(fs); | |
dfead8a8 | 1402 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1403 | } |
9d5c8190 PB |
1404 | if (req->flags & REQ_F_INFLIGHT) |
1405 | io_req_drop_files(req); | |
51a4cc11 | 1406 | |
5c3462cf | 1407 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1408 | } |
1409 | ||
1e6fa521 JA |
1410 | /* |
1411 | * Create a private copy of io_identity, since some fields don't match | |
1412 | * the current context. | |
1413 | */ | |
1414 | static bool io_identity_cow(struct io_kiocb *req) | |
1415 | { | |
5c3462cf | 1416 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1417 | const struct cred *creds = NULL; |
1418 | struct io_identity *id; | |
1419 | ||
1420 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1421 | creds = req->work.identity->creds; | |
1422 | ||
1423 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1424 | if (unlikely(!id)) { | |
1425 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1426 | return false; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * We can safely just re-init the creds we copied Either the field | |
1431 | * matches the current one, or we haven't grabbed it yet. The only | |
1432 | * exception is ->creds, through registered personalities, so handle | |
1433 | * that one separately. | |
1434 | */ | |
1435 | io_init_identity(id); | |
1436 | if (creds) | |
e8c954df | 1437 | id->creds = creds; |
1e6fa521 JA |
1438 | |
1439 | /* add one for this request */ | |
1440 | refcount_inc(&id->count); | |
1441 | ||
cb8a8ae3 JA |
1442 | /* drop tctx and req identity references, if needed */ |
1443 | if (tctx->identity != &tctx->__identity && | |
1444 | refcount_dec_and_test(&tctx->identity->count)) | |
1445 | kfree(tctx->identity); | |
1446 | if (req->work.identity != &tctx->__identity && | |
1447 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1448 | kfree(req->work.identity); |
1449 | ||
1450 | req->work.identity = id; | |
500a373d | 1451 | tctx->identity = id; |
1e6fa521 JA |
1452 | return true; |
1453 | } | |
1454 | ||
1455 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1456 | { |
d3656344 | 1457 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1458 | struct io_identity *id = req->work.identity; |
23329513 | 1459 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1460 | |
69228338 JA |
1461 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1462 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1463 | return false; | |
1464 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1465 | } | |
91d8f519 | 1466 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1467 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1468 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1469 | rcu_read_lock(); |
1e6fa521 JA |
1470 | if (id->blkcg_css != blkcg_css()) { |
1471 | rcu_read_unlock(); | |
1472 | return false; | |
1473 | } | |
91d8f519 DZ |
1474 | /* |
1475 | * This should be rare, either the cgroup is dying or the task | |
1476 | * is moving cgroups. Just punt to root for the handful of ios. | |
1477 | */ | |
1e6fa521 | 1478 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1479 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1480 | rcu_read_unlock(); |
1481 | } | |
1482 | #endif | |
dfead8a8 | 1483 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1484 | if (id->creds != current_cred()) |
1485 | return false; | |
1486 | get_cred(id->creds); | |
dfead8a8 JA |
1487 | req->work.flags |= IO_WQ_WORK_CREDS; |
1488 | } | |
4ea33a97 JA |
1489 | #ifdef CONFIG_AUDIT |
1490 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1491 | current->sessionid != id->sessionid) | |
1492 | return false; | |
1493 | #endif | |
dfead8a8 JA |
1494 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1495 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1496 | if (current->fs != id->fs) |
1497 | return false; | |
1498 | spin_lock(&id->fs->lock); | |
1499 | if (!id->fs->in_exec) { | |
1500 | id->fs->users++; | |
dfead8a8 | 1501 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1502 | } else { |
1503 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1504 | } | |
1505 | spin_unlock(¤t->fs->lock); | |
1506 | } | |
af604703 PB |
1507 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1508 | (def->work_flags & IO_WQ_WORK_FILES) && | |
1509 | !(req->flags & REQ_F_NO_FILE_TABLE)) { | |
1510 | if (id->files != current->files || | |
1511 | id->nsproxy != current->nsproxy) | |
1512 | return false; | |
1513 | atomic_inc(&id->files->count); | |
1514 | get_nsproxy(id->nsproxy); | |
af604703 | 1515 | |
02a13674 JA |
1516 | if (!(req->flags & REQ_F_INFLIGHT)) { |
1517 | req->flags |= REQ_F_INFLIGHT; | |
1518 | ||
1519 | spin_lock_irq(&ctx->inflight_lock); | |
1520 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1521 | spin_unlock_irq(&ctx->inflight_lock); | |
1522 | } | |
af604703 PB |
1523 | req->work.flags |= IO_WQ_WORK_FILES; |
1524 | } | |
77788775 JA |
1525 | if (!(req->work.flags & IO_WQ_WORK_MM) && |
1526 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1527 | if (id->mm != current->mm) | |
1528 | return false; | |
1529 | mmgrab(id->mm); | |
1530 | req->work.flags |= IO_WQ_WORK_MM; | |
1531 | } | |
1e6fa521 JA |
1532 | |
1533 | return true; | |
1534 | } | |
1535 | ||
1536 | static void io_prep_async_work(struct io_kiocb *req) | |
1537 | { | |
1538 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1539 | struct io_ring_ctx *ctx = req->ctx; |
1540 | ||
1541 | io_req_init_async(req); | |
1542 | ||
feaadc4f PB |
1543 | if (req->flags & REQ_F_FORCE_ASYNC) |
1544 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1545 | ||
1e6fa521 JA |
1546 | if (req->flags & REQ_F_ISREG) { |
1547 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1548 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1549 | } else { | |
1550 | if (def->unbound_nonreg_file) | |
1551 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1552 | } | |
1553 | ||
1e6fa521 JA |
1554 | /* if we fail grabbing identity, we must COW, regrab, and retry */ |
1555 | if (io_grab_identity(req)) | |
1556 | return; | |
1557 | ||
1558 | if (!io_identity_cow(req)) | |
1559 | return; | |
1560 | ||
1561 | /* can't fail at this point */ | |
1562 | if (!io_grab_identity(req)) | |
1563 | WARN_ON(1); | |
561fb04a | 1564 | } |
cccf0ee8 | 1565 | |
cbdcb435 | 1566 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1567 | { |
cbdcb435 | 1568 | struct io_kiocb *cur; |
54a91f3b | 1569 | |
f2f87370 PB |
1570 | io_for_each_link(cur, req) |
1571 | io_prep_async_work(cur); | |
561fb04a JA |
1572 | } |
1573 | ||
7271ef3a | 1574 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1575 | { |
a197f664 | 1576 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1577 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1578 | |
8766dd51 PB |
1579 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1580 | &req->work, req->flags); | |
1581 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1582 | return link; |
18d9be1a JA |
1583 | } |
1584 | ||
cbdcb435 PB |
1585 | static void io_queue_async_work(struct io_kiocb *req) |
1586 | { | |
7271ef3a JA |
1587 | struct io_kiocb *link; |
1588 | ||
cbdcb435 PB |
1589 | /* init ->work of the whole link before punting */ |
1590 | io_prep_async_link(req); | |
7271ef3a JA |
1591 | link = __io_queue_async_work(req); |
1592 | ||
1593 | if (link) | |
1594 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1595 | } |
1596 | ||
5262f567 JA |
1597 | static void io_kill_timeout(struct io_kiocb *req) |
1598 | { | |
e8c2bc1f | 1599 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1600 | int ret; |
1601 | ||
e8c2bc1f | 1602 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1603 | if (ret != -1) { |
01cec8c1 PB |
1604 | atomic_set(&req->ctx->cq_timeouts, |
1605 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1606 | list_del_init(&req->timeout.list); |
78e19bbe | 1607 | io_cqring_fill_event(req, 0); |
216578e5 | 1608 | io_put_req_deferred(req, 1); |
5262f567 JA |
1609 | } |
1610 | } | |
1611 | ||
76e1b642 JA |
1612 | /* |
1613 | * Returns true if we found and killed one or more timeouts | |
1614 | */ | |
6b81928d PB |
1615 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1616 | struct files_struct *files) | |
5262f567 JA |
1617 | { |
1618 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1619 | int canceled = 0; |
5262f567 JA |
1620 | |
1621 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1622 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1623 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1624 | io_kill_timeout(req); |
76e1b642 JA |
1625 | canceled++; |
1626 | } | |
f3606e3a | 1627 | } |
5262f567 | 1628 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1629 | return canceled != 0; |
5262f567 JA |
1630 | } |
1631 | ||
04518945 | 1632 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1633 | { |
04518945 | 1634 | do { |
27dc8338 PB |
1635 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1636 | struct io_defer_entry, list); | |
de0617e4 | 1637 | |
9cf7c104 | 1638 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1639 | break; |
27dc8338 | 1640 | list_del_init(&de->list); |
907d1df3 | 1641 | io_req_task_queue(de->req); |
27dc8338 | 1642 | kfree(de); |
04518945 PB |
1643 | } while (!list_empty(&ctx->defer_list)); |
1644 | } | |
1645 | ||
360428f8 | 1646 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1647 | { |
f010505b MDG |
1648 | u32 seq; |
1649 | ||
1650 | if (list_empty(&ctx->timeout_list)) | |
1651 | return; | |
1652 | ||
1653 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
1654 | ||
1655 | do { | |
1656 | u32 events_needed, events_got; | |
360428f8 | 1657 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1658 | struct io_kiocb, timeout.list); |
de0617e4 | 1659 | |
8eb7e2d0 | 1660 | if (io_is_timeout_noseq(req)) |
360428f8 | 1661 | break; |
f010505b MDG |
1662 | |
1663 | /* | |
1664 | * Since seq can easily wrap around over time, subtract | |
1665 | * the last seq at which timeouts were flushed before comparing. | |
1666 | * Assuming not more than 2^31-1 events have happened since, | |
1667 | * these subtractions won't have wrapped, so we can check if | |
1668 | * target is in [last_seq, current_seq] by comparing the two. | |
1669 | */ | |
1670 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1671 | events_got = seq - ctx->cq_last_tm_flush; | |
1672 | if (events_got < events_needed) | |
360428f8 | 1673 | break; |
bfe68a22 | 1674 | |
135fcde8 | 1675 | list_del_init(&req->timeout.list); |
5262f567 | 1676 | io_kill_timeout(req); |
f010505b MDG |
1677 | } while (!list_empty(&ctx->timeout_list)); |
1678 | ||
1679 | ctx->cq_last_tm_flush = seq; | |
360428f8 | 1680 | } |
5262f567 | 1681 | |
360428f8 PB |
1682 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1683 | { | |
1684 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1685 | __io_commit_cqring(ctx); |
1686 | ||
04518945 PB |
1687 | if (unlikely(!list_empty(&ctx->defer_list))) |
1688 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1689 | } |
1690 | ||
90554200 JA |
1691 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1692 | { | |
1693 | struct io_rings *r = ctx->rings; | |
1694 | ||
1695 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1696 | } | |
1697 | ||
2b188cc1 JA |
1698 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1699 | { | |
75b28aff | 1700 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1701 | unsigned tail; |
1702 | ||
1703 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1704 | /* |
1705 | * writes to the cq entry need to come after reading head; the | |
1706 | * control dependency is enough as we're using WRITE_ONCE to | |
1707 | * fill the cq entry | |
1708 | */ | |
75b28aff | 1709 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1710 | return NULL; |
1711 | ||
1712 | ctx->cached_cq_tail++; | |
75b28aff | 1713 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1714 | } |
1715 | ||
f2842ab5 JA |
1716 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1717 | { | |
f0b493e6 JA |
1718 | if (!ctx->cq_ev_fd) |
1719 | return false; | |
7e55a19c SG |
1720 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1721 | return false; | |
f2842ab5 JA |
1722 | if (!ctx->eventfd_async) |
1723 | return true; | |
b41e9852 | 1724 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1725 | } |
1726 | ||
e23de15f PB |
1727 | static inline unsigned __io_cqring_events(struct io_ring_ctx *ctx) |
1728 | { | |
1729 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1730 | } | |
1731 | ||
b41e9852 | 1732 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1733 | { |
b1445e59 PB |
1734 | /* see waitqueue_active() comment */ |
1735 | smp_mb(); | |
1736 | ||
1d7bb1d5 JA |
1737 | if (waitqueue_active(&ctx->wait)) |
1738 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1739 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1740 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1741 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1742 | eventfd_signal(ctx->cq_ev_fd, 1); |
b1445e59 | 1743 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1744 | wake_up_interruptible(&ctx->cq_wait); |
1745 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1746 | } | |
1d7bb1d5 JA |
1747 | } |
1748 | ||
80c18e4a PB |
1749 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1750 | { | |
b1445e59 PB |
1751 | /* see waitqueue_active() comment */ |
1752 | smp_mb(); | |
1753 | ||
80c18e4a PB |
1754 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1755 | if (waitqueue_active(&ctx->wait)) | |
1756 | wake_up(&ctx->wait); | |
1757 | } | |
1758 | if (io_should_trigger_evfd(ctx)) | |
1759 | eventfd_signal(ctx->cq_ev_fd, 1); | |
b1445e59 | 1760 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1761 | wake_up_interruptible(&ctx->cq_wait); |
1762 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1763 | } | |
80c18e4a PB |
1764 | } |
1765 | ||
c4a2ed72 | 1766 | /* Returns true if there are no backlogged entries after the flush */ |
6c503150 PB |
1767 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1768 | struct task_struct *tsk, | |
1769 | struct files_struct *files) | |
1d7bb1d5 JA |
1770 | { |
1771 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1772 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1773 | struct io_uring_cqe *cqe; |
1d7bb1d5 | 1774 | unsigned long flags; |
b18032bb | 1775 | bool all_flushed, posted; |
1d7bb1d5 JA |
1776 | LIST_HEAD(list); |
1777 | ||
e23de15f PB |
1778 | if (!force && __io_cqring_events(ctx) == rings->cq_ring_entries) |
1779 | return false; | |
1d7bb1d5 | 1780 | |
b18032bb | 1781 | posted = false; |
1d7bb1d5 | 1782 | spin_lock_irqsave(&ctx->completion_lock, flags); |
e6c8aa9a | 1783 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1784 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1785 | continue; |
1786 | ||
1d7bb1d5 JA |
1787 | cqe = io_get_cqring(ctx); |
1788 | if (!cqe && !force) | |
1789 | break; | |
1790 | ||
40d8ddd4 | 1791 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1792 | if (cqe) { |
1793 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1794 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1795 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1796 | } else { |
2c3bac6d | 1797 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1798 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1799 | ctx->cached_cq_overflow); |
1d7bb1d5 | 1800 | } |
b18032bb | 1801 | posted = true; |
1d7bb1d5 JA |
1802 | } |
1803 | ||
09e88404 PB |
1804 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1805 | if (all_flushed) { | |
1806 | clear_bit(0, &ctx->sq_check_overflow); | |
1807 | clear_bit(0, &ctx->cq_check_overflow); | |
1808 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1809 | } | |
46930143 | 1810 | |
b18032bb JA |
1811 | if (posted) |
1812 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1813 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1814 | if (posted) |
1815 | io_cqring_ev_posted(ctx); | |
1d7bb1d5 JA |
1816 | |
1817 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1818 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1819 | list_del(&req->compl.list); | |
ec9c02ad | 1820 | io_put_req(req); |
1d7bb1d5 | 1821 | } |
c4a2ed72 | 1822 | |
09e88404 | 1823 | return all_flushed; |
1d7bb1d5 JA |
1824 | } |
1825 | ||
6c503150 PB |
1826 | static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1827 | struct task_struct *tsk, | |
1828 | struct files_struct *files) | |
1829 | { | |
1830 | if (test_bit(0, &ctx->cq_check_overflow)) { | |
1831 | /* iopoll syncs against uring_lock, not completion_lock */ | |
1832 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1833 | mutex_lock(&ctx->uring_lock); | |
1834 | __io_cqring_overflow_flush(ctx, force, tsk, files); | |
1835 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1836 | mutex_unlock(&ctx->uring_lock); | |
1837 | } | |
1838 | } | |
1839 | ||
bcda7baa | 1840 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1841 | { |
78e19bbe | 1842 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1843 | struct io_uring_cqe *cqe; |
1844 | ||
78e19bbe | 1845 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1846 | |
2b188cc1 JA |
1847 | /* |
1848 | * If we can't get a cq entry, userspace overflowed the | |
1849 | * submission (by quite a lot). Increment the overflow count in | |
1850 | * the ring. | |
1851 | */ | |
1852 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1853 | if (likely(cqe)) { |
78e19bbe | 1854 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1855 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1856 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1857 | } else if (ctx->cq_overflow_flushed || |
1858 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1859 | /* |
1860 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1861 | * then we cannot store the request for later flushing, we need | |
1862 | * to drop it on the floor. | |
1863 | */ | |
2c3bac6d PB |
1864 | ctx->cached_cq_overflow++; |
1865 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1866 | } else { |
ad3eb2c8 JA |
1867 | if (list_empty(&ctx->cq_overflow_list)) { |
1868 | set_bit(0, &ctx->sq_check_overflow); | |
1869 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1870 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1871 | } |
40d8ddd4 | 1872 | io_clean_op(req); |
1d7bb1d5 | 1873 | req->result = res; |
0f7e466b | 1874 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1875 | refcount_inc(&req->refs); |
1876 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1877 | } |
1878 | } | |
1879 | ||
bcda7baa JA |
1880 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1881 | { | |
1882 | __io_cqring_fill_event(req, res, 0); | |
1883 | } | |
1884 | ||
e1e16097 | 1885 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1886 | { |
78e19bbe | 1887 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1888 | unsigned long flags; |
1889 | ||
1890 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1891 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1892 | io_commit_cqring(ctx); |
1893 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1894 | ||
8c838788 | 1895 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1896 | } |
1897 | ||
229a7b63 | 1898 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1899 | { |
229a7b63 JA |
1900 | struct io_ring_ctx *ctx = cs->ctx; |
1901 | ||
1902 | spin_lock_irq(&ctx->completion_lock); | |
1903 | while (!list_empty(&cs->list)) { | |
1904 | struct io_kiocb *req; | |
1905 | ||
3ca405eb PB |
1906 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1907 | list_del(&req->compl.list); | |
0f7e466b | 1908 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1909 | |
1910 | /* | |
1911 | * io_free_req() doesn't care about completion_lock unless one | |
1912 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1913 | * because of a potential deadlock with req->work.fs->lock | |
1914 | */ | |
1915 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1916 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1917 | spin_unlock_irq(&ctx->completion_lock); |
1918 | io_put_req(req); | |
1919 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1920 | } else { |
1921 | io_put_req(req); | |
229a7b63 JA |
1922 | } |
1923 | } | |
1924 | io_commit_cqring(ctx); | |
1925 | spin_unlock_irq(&ctx->completion_lock); | |
1926 | ||
1927 | io_cqring_ev_posted(ctx); | |
1928 | cs->nr = 0; | |
1929 | } | |
1930 | ||
1931 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1932 | struct io_comp_state *cs) | |
1933 | { | |
1934 | if (!cs) { | |
1935 | io_cqring_add_event(req, res, cflags); | |
1936 | io_put_req(req); | |
1937 | } else { | |
3ca405eb | 1938 | io_clean_op(req); |
229a7b63 | 1939 | req->result = res; |
0f7e466b | 1940 | req->compl.cflags = cflags; |
3ca405eb | 1941 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1942 | if (++cs->nr >= 32) |
1943 | io_submit_flush_completions(cs); | |
1944 | } | |
e1e16097 JA |
1945 | } |
1946 | ||
1947 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1948 | { |
229a7b63 | 1949 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1950 | } |
1951 | ||
0ddf92e8 JA |
1952 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1953 | { | |
1954 | return req == (struct io_kiocb *) | |
1955 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1956 | } | |
1957 | ||
1958 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1959 | { | |
1960 | struct io_kiocb *req; | |
1961 | ||
1962 | req = ctx->fallback_req; | |
dd461af6 | 1963 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1964 | return req; |
1965 | ||
1966 | return NULL; | |
1967 | } | |
1968 | ||
0553b8bd PB |
1969 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1970 | struct io_submit_state *state) | |
2b188cc1 | 1971 | { |
f6b6c7d6 | 1972 | if (!state->free_reqs) { |
291b2821 | 1973 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1974 | size_t sz; |
1975 | int ret; | |
1976 | ||
1977 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1978 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1979 | ||
1980 | /* | |
1981 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1982 | * retry single alloc to be on the safe side. | |
1983 | */ | |
1984 | if (unlikely(ret <= 0)) { | |
1985 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1986 | if (!state->reqs[0]) | |
0ddf92e8 | 1987 | goto fallback; |
fd6fab2c JA |
1988 | ret = 1; |
1989 | } | |
291b2821 | 1990 | state->free_reqs = ret; |
2b188cc1 JA |
1991 | } |
1992 | ||
291b2821 PB |
1993 | state->free_reqs--; |
1994 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1995 | fallback: |
0553b8bd | 1996 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1997 | } |
1998 | ||
8da11c19 PB |
1999 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
2000 | bool fixed) | |
2001 | { | |
36f72fe2 | 2002 | if (!fixed) |
8da11c19 PB |
2003 | fput(file); |
2004 | } | |
2005 | ||
4edf20f9 | 2006 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2007 | { |
3ca405eb | 2008 | io_clean_op(req); |
929a3af9 | 2009 | |
e8c2bc1f JA |
2010 | if (req->async_data) |
2011 | kfree(req->async_data); | |
8da11c19 PB |
2012 | if (req->file) |
2013 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
36f72fe2 PB |
2014 | if (req->fixed_file_refs) |
2015 | percpu_ref_put(req->fixed_file_refs); | |
4edf20f9 | 2016 | io_req_clean_work(req); |
e65ef56d JA |
2017 | } |
2018 | ||
216578e5 | 2019 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2020 | { |
0f212204 | 2021 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 2022 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2023 | |
216578e5 | 2024 | io_dismantle_req(req); |
c6ca97b3 | 2025 | |
d8a6df10 | 2026 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 2027 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 2028 | wake_up(&tctx->wait); |
e3bc8e9d JA |
2029 | put_task_struct(req->task); |
2030 | ||
b1e50e54 PB |
2031 | if (likely(!io_is_fallback_req(req))) |
2032 | kmem_cache_free(req_cachep, req); | |
2033 | else | |
ecfc5177 PB |
2034 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
2035 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
2036 | } |
2037 | ||
f2f87370 PB |
2038 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2039 | { | |
2040 | struct io_kiocb *nxt = req->link; | |
2041 | ||
2042 | req->link = nxt->link; | |
2043 | nxt->link = NULL; | |
2044 | } | |
2045 | ||
c9abd7ad | 2046 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 2047 | { |
a197f664 | 2048 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 2049 | struct io_kiocb *link; |
c9abd7ad PB |
2050 | bool cancelled = false; |
2051 | unsigned long flags; | |
7c86ffee | 2052 | |
c9abd7ad | 2053 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2054 | link = req->link; |
2055 | ||
900fad45 PB |
2056 | /* |
2057 | * Can happen if a linked timeout fired and link had been like | |
2058 | * req -> link t-out -> link t-out [-> ...] | |
2059 | */ | |
c9abd7ad PB |
2060 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
2061 | struct io_timeout_data *io = link->async_data; | |
2062 | int ret; | |
7c86ffee | 2063 | |
f2f87370 | 2064 | io_remove_next_linked(req); |
90cd7e42 | 2065 | link->timeout.head = NULL; |
c9abd7ad PB |
2066 | ret = hrtimer_try_to_cancel(&io->timer); |
2067 | if (ret != -1) { | |
2068 | io_cqring_fill_event(link, -ECANCELED); | |
2069 | io_commit_cqring(ctx); | |
2070 | cancelled = true; | |
2071 | } | |
2072 | } | |
7c86ffee | 2073 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 2074 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 2075 | |
c9abd7ad | 2076 | if (cancelled) { |
7c86ffee | 2077 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2078 | io_put_req(link); |
2079 | } | |
7c86ffee PB |
2080 | } |
2081 | ||
9e645e11 | 2082 | |
d148ca4b | 2083 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2084 | { |
f2f87370 | 2085 | struct io_kiocb *link, *nxt; |
2665abfd | 2086 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2087 | unsigned long flags; |
9e645e11 | 2088 | |
d148ca4b | 2089 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2090 | link = req->link; |
2091 | req->link = NULL; | |
9e645e11 | 2092 | |
f2f87370 PB |
2093 | while (link) { |
2094 | nxt = link->link; | |
2095 | link->link = NULL; | |
2665abfd | 2096 | |
f2f87370 | 2097 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2098 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2099 | |
2100 | /* | |
2101 | * It's ok to free under spinlock as they're not linked anymore, | |
2102 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2103 | * work.fs->lock. | |
2104 | */ | |
2105 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2106 | io_put_req_deferred(link, 2); | |
2107 | else | |
2108 | io_double_put_req(link); | |
f2f87370 | 2109 | link = nxt; |
9e645e11 | 2110 | } |
2665abfd | 2111 | io_commit_cqring(ctx); |
216578e5 | 2112 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2113 | |
2665abfd | 2114 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2115 | } |
2116 | ||
3fa5e0f3 | 2117 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2118 | { |
7c86ffee PB |
2119 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2120 | io_kill_linked_timeout(req); | |
944e58bf | 2121 | |
9e645e11 JA |
2122 | /* |
2123 | * If LINK is set, we have dependent requests in this chain. If we | |
2124 | * didn't fail this request, queue the first one up, moving any other | |
2125 | * dependencies to the next request. In case of failure, fail the rest | |
2126 | * of the chain. | |
2127 | */ | |
f2f87370 PB |
2128 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2129 | struct io_kiocb *nxt = req->link; | |
2130 | ||
2131 | req->link = NULL; | |
2132 | return nxt; | |
2133 | } | |
9b5f7bd9 PB |
2134 | io_fail_links(req); |
2135 | return NULL; | |
4d7dd462 | 2136 | } |
9e645e11 | 2137 | |
f2f87370 | 2138 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2139 | { |
f2f87370 | 2140 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2141 | return NULL; |
2142 | return __io_req_find_next(req); | |
2143 | } | |
2144 | ||
355fb9e2 | 2145 | static int io_req_task_work_add(struct io_kiocb *req) |
c2c4c83c JA |
2146 | { |
2147 | struct task_struct *tsk = req->task; | |
2148 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2149 | enum task_work_notify_mode notify; |
2150 | int ret; | |
c2c4c83c | 2151 | |
6200b0ae JA |
2152 | if (tsk->flags & PF_EXITING) |
2153 | return -ESRCH; | |
2154 | ||
c2c4c83c | 2155 | /* |
0ba9c9ed JA |
2156 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2157 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2158 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2159 | * will do the job. | |
c2c4c83c | 2160 | */ |
91989c70 | 2161 | notify = TWA_NONE; |
355fb9e2 | 2162 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) |
c2c4c83c JA |
2163 | notify = TWA_SIGNAL; |
2164 | ||
87c4311f | 2165 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2166 | if (!ret) |
2167 | wake_up_process(tsk); | |
0ba9c9ed | 2168 | |
c2c4c83c JA |
2169 | return ret; |
2170 | } | |
2171 | ||
c40f6379 JA |
2172 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2173 | { | |
2174 | struct io_ring_ctx *ctx = req->ctx; | |
2175 | ||
2176 | spin_lock_irq(&ctx->completion_lock); | |
2177 | io_cqring_fill_event(req, error); | |
2178 | io_commit_cqring(ctx); | |
2179 | spin_unlock_irq(&ctx->completion_lock); | |
2180 | ||
2181 | io_cqring_ev_posted(ctx); | |
2182 | req_set_fail_links(req); | |
2183 | io_double_put_req(req); | |
2184 | } | |
2185 | ||
2186 | static void io_req_task_cancel(struct callback_head *cb) | |
2187 | { | |
2188 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2189 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2190 | |
2191 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2192 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2193 | } |
2194 | ||
2195 | static void __io_req_task_submit(struct io_kiocb *req) | |
2196 | { | |
2197 | struct io_ring_ctx *ctx = req->ctx; | |
2198 | ||
81b6d05c | 2199 | mutex_lock(&ctx->uring_lock); |
d9d05217 PB |
2200 | if (!ctx->sqo_dead && |
2201 | !__io_sq_thread_acquire_mm(ctx) && | |
2202 | !__io_sq_thread_acquire_files(ctx)) | |
c1379e24 | 2203 | __io_queue_sqe(req, NULL); |
81b6d05c | 2204 | else |
c40f6379 | 2205 | __io_req_task_cancel(req, -EFAULT); |
81b6d05c | 2206 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2207 | } |
2208 | ||
2209 | static void io_req_task_submit(struct callback_head *cb) | |
2210 | { | |
2211 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2212 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2213 | |
2214 | __io_req_task_submit(req); | |
6d816e08 | 2215 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2216 | } |
2217 | ||
2218 | static void io_req_task_queue(struct io_kiocb *req) | |
2219 | { | |
c40f6379 JA |
2220 | int ret; |
2221 | ||
2222 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2223 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2224 | |
355fb9e2 | 2225 | ret = io_req_task_work_add(req); |
c40f6379 | 2226 | if (unlikely(ret)) { |
c2c4c83c JA |
2227 | struct task_struct *tsk; |
2228 | ||
c40f6379 JA |
2229 | init_task_work(&req->task_work, io_req_task_cancel); |
2230 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2231 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2232 | wake_up_process(tsk); |
c40f6379 | 2233 | } |
c40f6379 JA |
2234 | } |
2235 | ||
f2f87370 | 2236 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2237 | { |
9b5f7bd9 | 2238 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2239 | |
2240 | if (nxt) | |
906a8c3f | 2241 | io_req_task_queue(nxt); |
c69f8dbe JL |
2242 | } |
2243 | ||
c3524383 | 2244 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2245 | { |
c3524383 PB |
2246 | io_queue_next(req); |
2247 | __io_free_req(req); | |
2248 | } | |
8766dd51 | 2249 | |
2d6500d4 PB |
2250 | struct req_batch { |
2251 | void *reqs[IO_IOPOLL_BATCH]; | |
2252 | int to_free; | |
7a743e22 | 2253 | |
5af1d13e PB |
2254 | struct task_struct *task; |
2255 | int task_refs; | |
2d6500d4 PB |
2256 | }; |
2257 | ||
5af1d13e PB |
2258 | static inline void io_init_req_batch(struct req_batch *rb) |
2259 | { | |
2260 | rb->to_free = 0; | |
2261 | rb->task_refs = 0; | |
2262 | rb->task = NULL; | |
2263 | } | |
2264 | ||
2d6500d4 PB |
2265 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2266 | struct req_batch *rb) | |
2267 | { | |
2268 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2269 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2270 | rb->to_free = 0; | |
2271 | } | |
2272 | ||
2273 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2274 | struct req_batch *rb) | |
2275 | { | |
2276 | if (rb->to_free) | |
2277 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2278 | if (rb->task) { |
d8a6df10 JA |
2279 | struct io_uring_task *tctx = rb->task->io_uring; |
2280 | ||
2281 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
c93cc9e1 JA |
2282 | if (atomic_read(&tctx->in_idle)) |
2283 | wake_up(&tctx->wait); | |
5af1d13e PB |
2284 | put_task_struct_many(rb->task, rb->task_refs); |
2285 | rb->task = NULL; | |
2286 | } | |
2d6500d4 PB |
2287 | } |
2288 | ||
2289 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2290 | { | |
2291 | if (unlikely(io_is_fallback_req(req))) { | |
2292 | io_free_req(req); | |
2293 | return; | |
2294 | } | |
f2f87370 | 2295 | io_queue_next(req); |
2d6500d4 | 2296 | |
e3bc8e9d | 2297 | if (req->task != rb->task) { |
0f212204 | 2298 | if (rb->task) { |
d8a6df10 JA |
2299 | struct io_uring_task *tctx = rb->task->io_uring; |
2300 | ||
2301 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
c93cc9e1 JA |
2302 | if (atomic_read(&tctx->in_idle)) |
2303 | wake_up(&tctx->wait); | |
e3bc8e9d | 2304 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2305 | } |
e3bc8e9d JA |
2306 | rb->task = req->task; |
2307 | rb->task_refs = 0; | |
5af1d13e | 2308 | } |
e3bc8e9d | 2309 | rb->task_refs++; |
5af1d13e | 2310 | |
4edf20f9 | 2311 | io_dismantle_req(req); |
2d6500d4 PB |
2312 | rb->reqs[rb->to_free++] = req; |
2313 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2314 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2315 | } |
2316 | ||
ba816ad6 JA |
2317 | /* |
2318 | * Drop reference to request, return next in chain (if there is one) if this | |
2319 | * was the last reference to this request. | |
2320 | */ | |
9b5f7bd9 | 2321 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2322 | { |
9b5f7bd9 PB |
2323 | struct io_kiocb *nxt = NULL; |
2324 | ||
2a44f467 | 2325 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2326 | nxt = io_req_find_next(req); |
4d7dd462 | 2327 | __io_free_req(req); |
2a44f467 | 2328 | } |
9b5f7bd9 | 2329 | return nxt; |
2b188cc1 JA |
2330 | } |
2331 | ||
e65ef56d JA |
2332 | static void io_put_req(struct io_kiocb *req) |
2333 | { | |
2334 | if (refcount_dec_and_test(&req->refs)) | |
2335 | io_free_req(req); | |
2b188cc1 JA |
2336 | } |
2337 | ||
216578e5 PB |
2338 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2339 | { | |
2340 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2341 | ||
2342 | io_free_req(req); | |
2343 | } | |
2344 | ||
2345 | static void io_free_req_deferred(struct io_kiocb *req) | |
2346 | { | |
2347 | int ret; | |
2348 | ||
2349 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
355fb9e2 | 2350 | ret = io_req_task_work_add(req); |
216578e5 PB |
2351 | if (unlikely(ret)) { |
2352 | struct task_struct *tsk; | |
2353 | ||
2354 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2355 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2356 | wake_up_process(tsk); |
2357 | } | |
2358 | } | |
2359 | ||
2360 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2361 | { | |
2362 | if (refcount_sub_and_test(refs, &req->refs)) | |
2363 | io_free_req_deferred(req); | |
2364 | } | |
2365 | ||
f4db7182 | 2366 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2367 | { |
6df1db6b | 2368 | struct io_kiocb *nxt; |
f4db7182 | 2369 | |
7a743e22 | 2370 | /* |
f4db7182 PB |
2371 | * A ref is owned by io-wq in which context we're. So, if that's the |
2372 | * last one, it's safe to steal next work. False negatives are Ok, | |
2373 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2374 | */ |
f4db7182 PB |
2375 | if (refcount_read(&req->refs) != 1) |
2376 | return NULL; | |
7a743e22 | 2377 | |
9b5f7bd9 | 2378 | nxt = io_req_find_next(req); |
6df1db6b | 2379 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2380 | } |
2381 | ||
978db57e JA |
2382 | static void io_double_put_req(struct io_kiocb *req) |
2383 | { | |
2384 | /* drop both submit and complete references */ | |
2385 | if (refcount_sub_and_test(2, &req->refs)) | |
2386 | io_free_req(req); | |
2387 | } | |
2388 | ||
6c503150 | 2389 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2390 | { |
2391 | /* See comment at the top of this file */ | |
2392 | smp_rmb(); | |
e23de15f | 2393 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2394 | } |
2395 | ||
fb5ccc98 PB |
2396 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2397 | { | |
2398 | struct io_rings *rings = ctx->rings; | |
2399 | ||
2400 | /* make sure SQ entry isn't read before tail */ | |
2401 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2402 | } | |
2403 | ||
8ff069bf | 2404 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2405 | { |
8ff069bf | 2406 | unsigned int cflags; |
e94f141b | 2407 | |
bcda7baa JA |
2408 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2409 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2410 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2411 | kfree(kbuf); |
2412 | return cflags; | |
e94f141b JA |
2413 | } |
2414 | ||
8ff069bf | 2415 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2416 | { |
4d954c25 | 2417 | struct io_buffer *kbuf; |
bcda7baa | 2418 | |
4d954c25 | 2419 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2420 | return io_put_kbuf(req, kbuf); |
2421 | } | |
2422 | ||
4c6e277c JA |
2423 | static inline bool io_run_task_work(void) |
2424 | { | |
6200b0ae JA |
2425 | /* |
2426 | * Not safe to run on exiting task, and the task_work handling will | |
2427 | * not add work to such a task. | |
2428 | */ | |
2429 | if (unlikely(current->flags & PF_EXITING)) | |
2430 | return false; | |
4c6e277c JA |
2431 | if (current->task_works) { |
2432 | __set_current_state(TASK_RUNNING); | |
2433 | task_work_run(); | |
2434 | return true; | |
2435 | } | |
2436 | ||
2437 | return false; | |
bcda7baa JA |
2438 | } |
2439 | ||
bbde017a XW |
2440 | static void io_iopoll_queue(struct list_head *again) |
2441 | { | |
2442 | struct io_kiocb *req; | |
2443 | ||
2444 | do { | |
d21ffe7e PB |
2445 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2446 | list_del(&req->inflight_entry); | |
81b68a5c | 2447 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2448 | } while (!list_empty(again)); |
2449 | } | |
2450 | ||
def596e9 JA |
2451 | /* |
2452 | * Find and free completed poll iocbs | |
2453 | */ | |
2454 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2455 | struct list_head *done) | |
2456 | { | |
8237e045 | 2457 | struct req_batch rb; |
def596e9 | 2458 | struct io_kiocb *req; |
bbde017a XW |
2459 | LIST_HEAD(again); |
2460 | ||
2461 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2462 | smp_rmb(); | |
def596e9 | 2463 | |
5af1d13e | 2464 | io_init_req_batch(&rb); |
def596e9 | 2465 | while (!list_empty(done)) { |
bcda7baa JA |
2466 | int cflags = 0; |
2467 | ||
d21ffe7e | 2468 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2469 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2470 | req->result = 0; |
bbde017a | 2471 | req->iopoll_completed = 0; |
d21ffe7e | 2472 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2473 | continue; |
2474 | } | |
d21ffe7e | 2475 | list_del(&req->inflight_entry); |
def596e9 | 2476 | |
bcda7baa | 2477 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2478 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2479 | |
2480 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2481 | (*nr_events)++; |
2482 | ||
c3524383 | 2483 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2484 | io_req_free_batch(&rb, req); |
def596e9 | 2485 | } |
def596e9 | 2486 | |
09bb8394 | 2487 | io_commit_cqring(ctx); |
80c18e4a | 2488 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2489 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2490 | |
bbde017a XW |
2491 | if (!list_empty(&again)) |
2492 | io_iopoll_queue(&again); | |
581f9810 BM |
2493 | } |
2494 | ||
def596e9 JA |
2495 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2496 | long min) | |
2497 | { | |
2498 | struct io_kiocb *req, *tmp; | |
2499 | LIST_HEAD(done); | |
2500 | bool spin; | |
2501 | int ret; | |
2502 | ||
2503 | /* | |
2504 | * Only spin for completions if we don't have multiple devices hanging | |
2505 | * off our complete list, and we're under the requested amount. | |
2506 | */ | |
2507 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2508 | ||
2509 | ret = 0; | |
d21ffe7e | 2510 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2511 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2512 | |
2513 | /* | |
581f9810 BM |
2514 | * Move completed and retryable entries to our local lists. |
2515 | * If we find a request that requires polling, break out | |
2516 | * and complete those lists first, if we have entries there. | |
def596e9 | 2517 | */ |
65a6543d | 2518 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2519 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2520 | continue; |
2521 | } | |
2522 | if (!list_empty(&done)) | |
2523 | break; | |
2524 | ||
2525 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2526 | if (ret < 0) | |
2527 | break; | |
2528 | ||
3aadc23e PB |
2529 | /* iopoll may have completed current req */ |
2530 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2531 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2532 | |
def596e9 JA |
2533 | if (ret && spin) |
2534 | spin = false; | |
2535 | ret = 0; | |
2536 | } | |
2537 | ||
2538 | if (!list_empty(&done)) | |
2539 | io_iopoll_complete(ctx, nr_events, &done); | |
2540 | ||
2541 | return ret; | |
2542 | } | |
2543 | ||
2544 | /* | |
d195a66e | 2545 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2546 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2547 | * as a non-spinning completion check. | |
2548 | */ | |
2549 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2550 | long min) | |
2551 | { | |
540e32a0 | 2552 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2553 | int ret; |
2554 | ||
2555 | ret = io_do_iopoll(ctx, nr_events, min); | |
2556 | if (ret < 0) | |
2557 | return ret; | |
eba0a4dd | 2558 | if (*nr_events >= min) |
def596e9 JA |
2559 | return 0; |
2560 | } | |
2561 | ||
2562 | return 1; | |
2563 | } | |
2564 | ||
2565 | /* | |
2566 | * We can't just wait for polled events to come to us, we have to actively | |
2567 | * find and complete them. | |
2568 | */ | |
b2edc0a7 | 2569 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2570 | { |
2571 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2572 | return; | |
2573 | ||
2574 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2575 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2576 | unsigned int nr_events = 0; |
2577 | ||
b2edc0a7 | 2578 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2579 | |
b2edc0a7 PB |
2580 | /* let it sleep and repeat later if can't complete a request */ |
2581 | if (nr_events == 0) | |
2582 | break; | |
08f5439f JA |
2583 | /* |
2584 | * Ensure we allow local-to-the-cpu processing to take place, | |
2585 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2586 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2587 | */ |
3fcee5a6 PB |
2588 | if (need_resched()) { |
2589 | mutex_unlock(&ctx->uring_lock); | |
2590 | cond_resched(); | |
2591 | mutex_lock(&ctx->uring_lock); | |
2592 | } | |
def596e9 JA |
2593 | } |
2594 | mutex_unlock(&ctx->uring_lock); | |
2595 | } | |
2596 | ||
7668b92a | 2597 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2598 | { |
7668b92a | 2599 | unsigned int nr_events = 0; |
2b2ed975 | 2600 | int iters = 0, ret = 0; |
500f9fba | 2601 | |
c7849be9 XW |
2602 | /* |
2603 | * We disallow the app entering submit/complete with polling, but we | |
2604 | * still need to lock the ring to prevent racing with polled issue | |
2605 | * that got punted to a workqueue. | |
2606 | */ | |
2607 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2608 | do { |
a3a0e43f JA |
2609 | /* |
2610 | * Don't enter poll loop if we already have events pending. | |
2611 | * If we do, we can potentially be spinning for commands that | |
2612 | * already triggered a CQE (eg in error). | |
2613 | */ | |
6c503150 PB |
2614 | if (test_bit(0, &ctx->cq_check_overflow)) |
2615 | __io_cqring_overflow_flush(ctx, false, NULL, NULL); | |
2616 | if (io_cqring_events(ctx)) | |
a3a0e43f JA |
2617 | break; |
2618 | ||
500f9fba JA |
2619 | /* |
2620 | * If a submit got punted to a workqueue, we can have the | |
2621 | * application entering polling for a command before it gets | |
2622 | * issued. That app will hold the uring_lock for the duration | |
2623 | * of the poll right here, so we need to take a breather every | |
2624 | * now and then to ensure that the issue has a chance to add | |
2625 | * the poll to the issued list. Otherwise we can spin here | |
2626 | * forever, while the workqueue is stuck trying to acquire the | |
2627 | * very same mutex. | |
2628 | */ | |
2629 | if (!(++iters & 7)) { | |
2630 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2631 | io_run_task_work(); |
500f9fba JA |
2632 | mutex_lock(&ctx->uring_lock); |
2633 | } | |
2634 | ||
7668b92a | 2635 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2636 | if (ret <= 0) |
2637 | break; | |
2638 | ret = 0; | |
7668b92a | 2639 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2640 | |
500f9fba | 2641 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2642 | return ret; |
2643 | } | |
2644 | ||
491381ce | 2645 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2646 | { |
491381ce JA |
2647 | /* |
2648 | * Tell lockdep we inherited freeze protection from submission | |
2649 | * thread. | |
2650 | */ | |
2651 | if (req->flags & REQ_F_ISREG) { | |
2652 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2653 | |
491381ce | 2654 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2655 | } |
491381ce | 2656 | file_end_write(req->file); |
2b188cc1 JA |
2657 | } |
2658 | ||
a1d7c393 JA |
2659 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2660 | struct io_comp_state *cs) | |
2b188cc1 | 2661 | { |
9adbd45d | 2662 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2663 | int cflags = 0; |
2b188cc1 | 2664 | |
491381ce JA |
2665 | if (kiocb->ki_flags & IOCB_WRITE) |
2666 | kiocb_end_write(req); | |
2b188cc1 | 2667 | |
4e88d6e7 JA |
2668 | if (res != req->result) |
2669 | req_set_fail_links(req); | |
bcda7baa | 2670 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2671 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2672 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2673 | } |
2674 | ||
b63534c4 JA |
2675 | #ifdef CONFIG_BLOCK |
2676 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2677 | { | |
2678 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2679 | ssize_t ret = -ECANCELED; | |
2680 | struct iov_iter iter; | |
2681 | int rw; | |
2682 | ||
2683 | if (error) { | |
2684 | ret = error; | |
2685 | goto end_req; | |
2686 | } | |
2687 | ||
2688 | switch (req->opcode) { | |
2689 | case IORING_OP_READV: | |
2690 | case IORING_OP_READ_FIXED: | |
2691 | case IORING_OP_READ: | |
2692 | rw = READ; | |
2693 | break; | |
2694 | case IORING_OP_WRITEV: | |
2695 | case IORING_OP_WRITE_FIXED: | |
2696 | case IORING_OP_WRITE: | |
2697 | rw = WRITE; | |
2698 | break; | |
2699 | default: | |
2700 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2701 | req->opcode); | |
2702 | goto end_req; | |
2703 | } | |
2704 | ||
e8c2bc1f | 2705 | if (!req->async_data) { |
8f3d7496 JA |
2706 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2707 | if (ret < 0) | |
2708 | goto end_req; | |
2709 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2710 | if (!ret) | |
2711 | return true; | |
2712 | kfree(iovec); | |
2713 | } else { | |
b63534c4 | 2714 | return true; |
8f3d7496 | 2715 | } |
b63534c4 | 2716 | end_req: |
b63534c4 | 2717 | req_set_fail_links(req); |
b63534c4 JA |
2718 | return false; |
2719 | } | |
b63534c4 JA |
2720 | #endif |
2721 | ||
2722 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2723 | { | |
2724 | #ifdef CONFIG_BLOCK | |
355afaeb | 2725 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2726 | int ret; |
2727 | ||
355afaeb JA |
2728 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2729 | return false; | |
b63534c4 JA |
2730 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2731 | return false; | |
2732 | ||
55e6ac1e PB |
2733 | lockdep_assert_held(&req->ctx->uring_lock); |
2734 | ||
28cea78a | 2735 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2736 | |
fdee946d JA |
2737 | if (io_resubmit_prep(req, ret)) { |
2738 | refcount_inc(&req->refs); | |
2739 | io_queue_async_work(req); | |
b63534c4 | 2740 | return true; |
fdee946d JA |
2741 | } |
2742 | ||
b63534c4 JA |
2743 | #endif |
2744 | return false; | |
2745 | } | |
2746 | ||
a1d7c393 JA |
2747 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2748 | struct io_comp_state *cs) | |
2749 | { | |
2750 | if (!io_rw_reissue(req, res)) | |
2751 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2752 | } |
2753 | ||
2754 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2755 | { | |
9adbd45d | 2756 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2757 | |
a1d7c393 | 2758 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2759 | } |
2760 | ||
def596e9 JA |
2761 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2762 | { | |
9adbd45d | 2763 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2764 | |
491381ce JA |
2765 | if (kiocb->ki_flags & IOCB_WRITE) |
2766 | kiocb_end_write(req); | |
def596e9 | 2767 | |
2d7d6792 | 2768 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2769 | req_set_fail_links(req); |
bbde017a XW |
2770 | |
2771 | WRITE_ONCE(req->result, res); | |
2772 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2773 | smp_wmb(); |
2774 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2775 | } |
2776 | ||
2777 | /* | |
2778 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2779 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2780 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2781 | * accessing the kiocb cookie. | |
2782 | */ | |
2e9dbe90 | 2783 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2784 | { |
2785 | struct io_ring_ctx *ctx = req->ctx; | |
2786 | ||
2787 | /* | |
2788 | * Track whether we have multiple files in our lists. This will impact | |
2789 | * how we do polling eventually, not spinning if we're on potentially | |
2790 | * different devices. | |
2791 | */ | |
540e32a0 | 2792 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2793 | ctx->poll_multi_file = false; |
2794 | } else if (!ctx->poll_multi_file) { | |
2795 | struct io_kiocb *list_req; | |
2796 | ||
540e32a0 | 2797 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2798 | inflight_entry); |
9adbd45d | 2799 | if (list_req->file != req->file) |
def596e9 JA |
2800 | ctx->poll_multi_file = true; |
2801 | } | |
2802 | ||
2803 | /* | |
2804 | * For fast devices, IO may have already completed. If it has, add | |
2805 | * it to the front so we find it first. | |
2806 | */ | |
65a6543d | 2807 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2808 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2809 | else |
d21ffe7e | 2810 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2811 | |
2e9dbe90 XW |
2812 | /* |
2813 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2814 | * task context or in io worker task context. If current task context is | |
2815 | * sq thread, we don't need to check whether should wake up sq thread. | |
2816 | */ | |
2817 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2818 | wq_has_sleeper(&ctx->sq_data->wait)) |
2819 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2820 | } |
2821 | ||
6e1271e6 | 2822 | static inline void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2823 | { |
6e1271e6 PB |
2824 | fput_many(state->file, state->file_refs); |
2825 | state->file_refs = 0; | |
9f13c35b PB |
2826 | } |
2827 | ||
2828 | static inline void io_state_file_put(struct io_submit_state *state) | |
2829 | { | |
6e1271e6 | 2830 | if (state->file_refs) |
9f13c35b | 2831 | __io_state_file_put(state); |
9a56a232 JA |
2832 | } |
2833 | ||
2834 | /* | |
2835 | * Get as many references to a file as we have IOs left in this submission, | |
2836 | * assuming most submissions are for one file, or at least that each file | |
2837 | * has more than one submission. | |
2838 | */ | |
8da11c19 | 2839 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2840 | { |
2841 | if (!state) | |
2842 | return fget(fd); | |
2843 | ||
6e1271e6 | 2844 | if (state->file_refs) { |
9a56a232 | 2845 | if (state->fd == fd) { |
6e1271e6 | 2846 | state->file_refs--; |
9a56a232 JA |
2847 | return state->file; |
2848 | } | |
9f13c35b | 2849 | __io_state_file_put(state); |
9a56a232 JA |
2850 | } |
2851 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2852 | if (unlikely(!state->file)) |
9a56a232 JA |
2853 | return NULL; |
2854 | ||
2855 | state->fd = fd; | |
6e1271e6 | 2856 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2857 | return state->file; |
2858 | } | |
2859 | ||
4503b767 JA |
2860 | static bool io_bdev_nowait(struct block_device *bdev) |
2861 | { | |
9ba0d0c8 | 2862 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2863 | } |
2864 | ||
2b188cc1 JA |
2865 | /* |
2866 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2867 | * any file. For now, just ensure that anything potentially problematic is done | |
2868 | * inline. | |
2869 | */ | |
af197f50 | 2870 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2871 | { |
2872 | umode_t mode = file_inode(file)->i_mode; | |
2873 | ||
4503b767 | 2874 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2875 | if (IS_ENABLED(CONFIG_BLOCK) && |
2876 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2877 | return true; |
2878 | return false; | |
2879 | } | |
2880 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2881 | return true; |
4503b767 | 2882 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2883 | if (IS_ENABLED(CONFIG_BLOCK) && |
2884 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2885 | file->f_op != &io_uring_fops) |
2886 | return true; | |
2887 | return false; | |
2888 | } | |
2b188cc1 | 2889 | |
c5b85625 JA |
2890 | /* any ->read/write should understand O_NONBLOCK */ |
2891 | if (file->f_flags & O_NONBLOCK) | |
2892 | return true; | |
2893 | ||
af197f50 JA |
2894 | if (!(file->f_mode & FMODE_NOWAIT)) |
2895 | return false; | |
2896 | ||
2897 | if (rw == READ) | |
2898 | return file->f_op->read_iter != NULL; | |
2899 | ||
2900 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2901 | } |
2902 | ||
a88fc400 | 2903 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2904 | { |
def596e9 | 2905 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2906 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2907 | unsigned ioprio; |
2908 | int ret; | |
2b188cc1 | 2909 | |
491381ce JA |
2910 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2911 | req->flags |= REQ_F_ISREG; | |
2912 | ||
2b188cc1 | 2913 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2914 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2915 | req->flags |= REQ_F_CUR_POS; | |
2916 | kiocb->ki_pos = req->file->f_pos; | |
2917 | } | |
2b188cc1 | 2918 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2919 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2920 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2921 | if (unlikely(ret)) | |
2922 | return ret; | |
2b188cc1 JA |
2923 | |
2924 | ioprio = READ_ONCE(sqe->ioprio); | |
2925 | if (ioprio) { | |
2926 | ret = ioprio_check_cap(ioprio); | |
2927 | if (ret) | |
09bb8394 | 2928 | return ret; |
2b188cc1 JA |
2929 | |
2930 | kiocb->ki_ioprio = ioprio; | |
2931 | } else | |
2932 | kiocb->ki_ioprio = get_current_ioprio(); | |
2933 | ||
8449eeda | 2934 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2935 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2936 | req->flags |= REQ_F_NOWAIT; |
2937 | ||
def596e9 | 2938 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2939 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2940 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2941 | return -EOPNOTSUPP; |
2b188cc1 | 2942 | |
def596e9 JA |
2943 | kiocb->ki_flags |= IOCB_HIPRI; |
2944 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2945 | req->iopoll_completed = 0; |
def596e9 | 2946 | } else { |
09bb8394 JA |
2947 | if (kiocb->ki_flags & IOCB_HIPRI) |
2948 | return -EINVAL; | |
def596e9 JA |
2949 | kiocb->ki_complete = io_complete_rw; |
2950 | } | |
9adbd45d | 2951 | |
3529d8c2 JA |
2952 | req->rw.addr = READ_ONCE(sqe->addr); |
2953 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2954 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2955 | return 0; |
2b188cc1 JA |
2956 | } |
2957 | ||
2958 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2959 | { | |
2960 | switch (ret) { | |
2961 | case -EIOCBQUEUED: | |
2962 | break; | |
2963 | case -ERESTARTSYS: | |
2964 | case -ERESTARTNOINTR: | |
2965 | case -ERESTARTNOHAND: | |
2966 | case -ERESTART_RESTARTBLOCK: | |
2967 | /* | |
2968 | * We can't just restart the syscall, since previously | |
2969 | * submitted sqes may already be in progress. Just fail this | |
2970 | * IO with EINTR. | |
2971 | */ | |
2972 | ret = -EINTR; | |
df561f66 | 2973 | fallthrough; |
2b188cc1 JA |
2974 | default: |
2975 | kiocb->ki_complete(kiocb, ret, 0); | |
2976 | } | |
2977 | } | |
2978 | ||
a1d7c393 JA |
2979 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2980 | struct io_comp_state *cs) | |
ba816ad6 | 2981 | { |
ba04291e | 2982 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2983 | struct io_async_rw *io = req->async_data; |
ba04291e | 2984 | |
227c0c96 | 2985 | /* add previously done IO, if any */ |
e8c2bc1f | 2986 | if (io && io->bytes_done > 0) { |
227c0c96 | 2987 | if (ret < 0) |
e8c2bc1f | 2988 | ret = io->bytes_done; |
227c0c96 | 2989 | else |
e8c2bc1f | 2990 | ret += io->bytes_done; |
227c0c96 JA |
2991 | } |
2992 | ||
ba04291e JA |
2993 | if (req->flags & REQ_F_CUR_POS) |
2994 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2995 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2996 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2997 | else |
2998 | io_rw_done(kiocb, ret); | |
2999 | } | |
3000 | ||
9adbd45d | 3001 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 3002 | struct iov_iter *iter) |
edafccee | 3003 | { |
9adbd45d JA |
3004 | struct io_ring_ctx *ctx = req->ctx; |
3005 | size_t len = req->rw.len; | |
edafccee | 3006 | struct io_mapped_ubuf *imu; |
4be1c615 | 3007 | u16 index, buf_index = req->buf_index; |
edafccee JA |
3008 | size_t offset; |
3009 | u64 buf_addr; | |
3010 | ||
edafccee JA |
3011 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3012 | return -EFAULT; | |
edafccee JA |
3013 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3014 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 3015 | buf_addr = req->rw.addr; |
edafccee JA |
3016 | |
3017 | /* overflow */ | |
3018 | if (buf_addr + len < buf_addr) | |
3019 | return -EFAULT; | |
3020 | /* not inside the mapped region */ | |
3021 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
3022 | return -EFAULT; | |
3023 | ||
3024 | /* | |
3025 | * May not be a start of buffer, set size appropriately | |
3026 | * and advance us to the beginning. | |
3027 | */ | |
3028 | offset = buf_addr - imu->ubuf; | |
3029 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3030 | |
3031 | if (offset) { | |
3032 | /* | |
3033 | * Don't use iov_iter_advance() here, as it's really slow for | |
3034 | * using the latter parts of a big fixed buffer - it iterates | |
3035 | * over each segment manually. We can cheat a bit here, because | |
3036 | * we know that: | |
3037 | * | |
3038 | * 1) it's a BVEC iter, we set it up | |
3039 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3040 | * first and last bvec | |
3041 | * | |
3042 | * So just find our index, and adjust the iterator afterwards. | |
3043 | * If the offset is within the first bvec (or the whole first | |
3044 | * bvec, just use iov_iter_advance(). This makes it easier | |
3045 | * since we can just skip the first segment, which may not | |
3046 | * be PAGE_SIZE aligned. | |
3047 | */ | |
3048 | const struct bio_vec *bvec = imu->bvec; | |
3049 | ||
3050 | if (offset <= bvec->bv_len) { | |
3051 | iov_iter_advance(iter, offset); | |
3052 | } else { | |
3053 | unsigned long seg_skip; | |
3054 | ||
3055 | /* skip first vec */ | |
3056 | offset -= bvec->bv_len; | |
3057 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3058 | ||
3059 | iter->bvec = bvec + seg_skip; | |
3060 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3061 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3062 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3063 | } |
3064 | } | |
3065 | ||
5e559561 | 3066 | return len; |
edafccee JA |
3067 | } |
3068 | ||
bcda7baa JA |
3069 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3070 | { | |
3071 | if (needs_lock) | |
3072 | mutex_unlock(&ctx->uring_lock); | |
3073 | } | |
3074 | ||
3075 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3076 | { | |
3077 | /* | |
3078 | * "Normal" inline submissions always hold the uring_lock, since we | |
3079 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3080 | * The only exception is when we've detached the request and issue it | |
3081 | * from an async worker thread, grab the lock for that case. | |
3082 | */ | |
3083 | if (needs_lock) | |
3084 | mutex_lock(&ctx->uring_lock); | |
3085 | } | |
3086 | ||
3087 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3088 | int bgid, struct io_buffer *kbuf, | |
3089 | bool needs_lock) | |
3090 | { | |
3091 | struct io_buffer *head; | |
3092 | ||
3093 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3094 | return kbuf; | |
3095 | ||
3096 | io_ring_submit_lock(req->ctx, needs_lock); | |
3097 | ||
3098 | lockdep_assert_held(&req->ctx->uring_lock); | |
3099 | ||
3100 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3101 | if (head) { | |
3102 | if (!list_empty(&head->list)) { | |
3103 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3104 | list); | |
3105 | list_del(&kbuf->list); | |
3106 | } else { | |
3107 | kbuf = head; | |
3108 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3109 | } | |
3110 | if (*len > kbuf->len) | |
3111 | *len = kbuf->len; | |
3112 | } else { | |
3113 | kbuf = ERR_PTR(-ENOBUFS); | |
3114 | } | |
3115 | ||
3116 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3117 | ||
3118 | return kbuf; | |
3119 | } | |
3120 | ||
4d954c25 JA |
3121 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3122 | bool needs_lock) | |
3123 | { | |
3124 | struct io_buffer *kbuf; | |
4f4eeba8 | 3125 | u16 bgid; |
4d954c25 JA |
3126 | |
3127 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3128 | bgid = req->buf_index; |
4d954c25 JA |
3129 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3130 | if (IS_ERR(kbuf)) | |
3131 | return kbuf; | |
3132 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3133 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3134 | return u64_to_user_ptr(kbuf->addr); | |
3135 | } | |
3136 | ||
3137 | #ifdef CONFIG_COMPAT | |
3138 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3139 | bool needs_lock) | |
3140 | { | |
3141 | struct compat_iovec __user *uiov; | |
3142 | compat_ssize_t clen; | |
3143 | void __user *buf; | |
3144 | ssize_t len; | |
3145 | ||
3146 | uiov = u64_to_user_ptr(req->rw.addr); | |
3147 | if (!access_ok(uiov, sizeof(*uiov))) | |
3148 | return -EFAULT; | |
3149 | if (__get_user(clen, &uiov->iov_len)) | |
3150 | return -EFAULT; | |
3151 | if (clen < 0) | |
3152 | return -EINVAL; | |
3153 | ||
3154 | len = clen; | |
3155 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3156 | if (IS_ERR(buf)) | |
3157 | return PTR_ERR(buf); | |
3158 | iov[0].iov_base = buf; | |
3159 | iov[0].iov_len = (compat_size_t) len; | |
3160 | return 0; | |
3161 | } | |
3162 | #endif | |
3163 | ||
3164 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3165 | bool needs_lock) | |
3166 | { | |
3167 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3168 | void __user *buf; | |
3169 | ssize_t len; | |
3170 | ||
3171 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3172 | return -EFAULT; | |
3173 | ||
3174 | len = iov[0].iov_len; | |
3175 | if (len < 0) | |
3176 | return -EINVAL; | |
3177 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3178 | if (IS_ERR(buf)) | |
3179 | return PTR_ERR(buf); | |
3180 | iov[0].iov_base = buf; | |
3181 | iov[0].iov_len = len; | |
3182 | return 0; | |
3183 | } | |
3184 | ||
3185 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3186 | bool needs_lock) | |
3187 | { | |
dddb3e26 JA |
3188 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3189 | struct io_buffer *kbuf; | |
3190 | ||
3191 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3192 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3193 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3194 | return 0; |
dddb3e26 | 3195 | } |
dd201662 | 3196 | if (req->rw.len != 1) |
4d954c25 JA |
3197 | return -EINVAL; |
3198 | ||
3199 | #ifdef CONFIG_COMPAT | |
3200 | if (req->ctx->compat) | |
3201 | return io_compat_import(req, iov, needs_lock); | |
3202 | #endif | |
3203 | ||
3204 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3205 | } | |
3206 | ||
2846c481 | 3207 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
8452fd0c JA |
3208 | struct iovec **iovec, struct iov_iter *iter, |
3209 | bool needs_lock) | |
2b188cc1 | 3210 | { |
9adbd45d JA |
3211 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3212 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3213 | ssize_t ret; |
edafccee JA |
3214 | u8 opcode; |
3215 | ||
d625c6ee | 3216 | opcode = req->opcode; |
7d009165 | 3217 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3218 | *iovec = NULL; |
9adbd45d | 3219 | return io_import_fixed(req, rw, iter); |
edafccee | 3220 | } |
2b188cc1 | 3221 | |
bcda7baa | 3222 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3223 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3224 | return -EINVAL; |
3225 | ||
3a6820f2 | 3226 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3227 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3228 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3229 | if (IS_ERR(buf)) |
4d954c25 | 3230 | return PTR_ERR(buf); |
3f9d6441 | 3231 | req->rw.len = sqe_len; |
bcda7baa JA |
3232 | } |
3233 | ||
3a6820f2 JA |
3234 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3235 | *iovec = NULL; | |
10fc72e4 | 3236 | return ret; |
3a6820f2 JA |
3237 | } |
3238 | ||
4d954c25 JA |
3239 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3240 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3241 | if (!ret) { |
3242 | ret = (*iovec)->iov_len; | |
3243 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3244 | } | |
4d954c25 JA |
3245 | *iovec = NULL; |
3246 | return ret; | |
3247 | } | |
3248 | ||
89cd35c5 CH |
3249 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3250 | req->ctx->compat); | |
2b188cc1 JA |
3251 | } |
3252 | ||
0fef9483 JA |
3253 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3254 | { | |
5b09e37e | 3255 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3256 | } |
3257 | ||
31b51510 | 3258 | /* |
32960613 JA |
3259 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3260 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3261 | */ |
4017eb91 | 3262 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3263 | { |
4017eb91 JA |
3264 | struct kiocb *kiocb = &req->rw.kiocb; |
3265 | struct file *file = req->file; | |
32960613 JA |
3266 | ssize_t ret = 0; |
3267 | ||
3268 | /* | |
3269 | * Don't support polled IO through this interface, and we can't | |
3270 | * support non-blocking either. For the latter, this just causes | |
3271 | * the kiocb to be handled from an async context. | |
3272 | */ | |
3273 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3274 | return -EOPNOTSUPP; | |
3275 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3276 | return -EAGAIN; | |
3277 | ||
3278 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3279 | struct iovec iovec; |
32960613 JA |
3280 | ssize_t nr; |
3281 | ||
311ae9e1 PB |
3282 | if (!iov_iter_is_bvec(iter)) { |
3283 | iovec = iov_iter_iovec(iter); | |
3284 | } else { | |
4017eb91 JA |
3285 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3286 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3287 | } |
3288 | ||
32960613 JA |
3289 | if (rw == READ) { |
3290 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3291 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3292 | } else { |
3293 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3294 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3295 | } |
3296 | ||
3297 | if (nr < 0) { | |
3298 | if (!ret) | |
3299 | ret = nr; | |
3300 | break; | |
3301 | } | |
3302 | ret += nr; | |
3303 | if (nr != iovec.iov_len) | |
3304 | break; | |
4017eb91 JA |
3305 | req->rw.len -= nr; |
3306 | req->rw.addr += nr; | |
32960613 JA |
3307 | iov_iter_advance(iter, nr); |
3308 | } | |
3309 | ||
3310 | return ret; | |
3311 | } | |
3312 | ||
ff6165b2 JA |
3313 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3314 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3315 | { |
e8c2bc1f | 3316 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3317 | |
ff6165b2 | 3318 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3319 | rw->free_iovec = iovec; |
227c0c96 | 3320 | rw->bytes_done = 0; |
ff6165b2 | 3321 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3322 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3323 | return; |
b64e3444 | 3324 | if (!iovec) { |
ff6165b2 JA |
3325 | unsigned iov_off = 0; |
3326 | ||
3327 | rw->iter.iov = rw->fast_iov; | |
3328 | if (iter->iov != fast_iov) { | |
3329 | iov_off = iter->iov - fast_iov; | |
3330 | rw->iter.iov += iov_off; | |
3331 | } | |
3332 | if (rw->fast_iov != fast_iov) | |
3333 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3334 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3335 | } else { |
3336 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3337 | } |
3338 | } | |
3339 | ||
e8c2bc1f | 3340 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3341 | { |
e8c2bc1f JA |
3342 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3343 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3344 | return req->async_data == NULL; | |
3d9932a8 XW |
3345 | } |
3346 | ||
e8c2bc1f | 3347 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3348 | { |
e8c2bc1f | 3349 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3350 | return 0; |
3d9932a8 | 3351 | |
e8c2bc1f | 3352 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3353 | } |
3354 | ||
ff6165b2 JA |
3355 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3356 | const struct iovec *fast_iov, | |
227c0c96 | 3357 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3358 | { |
e8c2bc1f | 3359 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3360 | return 0; |
e8c2bc1f JA |
3361 | if (!req->async_data) { |
3362 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3363 | return -ENOMEM; |
b7bb4f7d | 3364 | |
ff6165b2 | 3365 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3366 | } |
b7bb4f7d | 3367 | return 0; |
f67676d1 JA |
3368 | } |
3369 | ||
73debe68 | 3370 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3371 | { |
e8c2bc1f | 3372 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3373 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3374 | ssize_t ret; |
3375 | ||
2846c481 | 3376 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3377 | if (unlikely(ret < 0)) |
3378 | return ret; | |
3379 | ||
ab0b196c PB |
3380 | iorw->bytes_done = 0; |
3381 | iorw->free_iovec = iov; | |
3382 | if (iov) | |
3383 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3384 | return 0; |
3385 | } | |
3386 | ||
73debe68 | 3387 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3388 | { |
3389 | ssize_t ret; | |
3390 | ||
a88fc400 | 3391 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3392 | if (ret) |
3393 | return ret; | |
f67676d1 | 3394 | |
3529d8c2 JA |
3395 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3396 | return -EBADF; | |
f67676d1 | 3397 | |
5f798bea | 3398 | /* either don't need iovec imported or already have it */ |
2d199895 | 3399 | if (!req->async_data) |
3529d8c2 | 3400 | return 0; |
73debe68 | 3401 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3402 | } |
3403 | ||
c1dd91d1 JA |
3404 | /* |
3405 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3406 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3407 | * This gets called when the page is unlocked, and we generally expect that to | |
3408 | * happen when the page IO is completed and the page is now uptodate. This will | |
3409 | * queue a task_work based retry of the operation, attempting to copy the data | |
3410 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3411 | * do a thread based blocking retry of the operation. That's the unexpected | |
3412 | * slow path. | |
3413 | */ | |
bcf5a063 JA |
3414 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3415 | int sync, void *arg) | |
3416 | { | |
3417 | struct wait_page_queue *wpq; | |
3418 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3419 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3420 | int ret; |
3421 | ||
3422 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3423 | ||
cdc8fcb4 LT |
3424 | if (!wake_page_match(wpq, key)) |
3425 | return 0; | |
3426 | ||
c8d317aa | 3427 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3428 | list_del_init(&wait->entry); |
3429 | ||
e7375122 | 3430 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3431 | percpu_ref_get(&req->ctx->refs); |
3432 | ||
bcf5a063 JA |
3433 | /* submit ref gets dropped, acquire a new one */ |
3434 | refcount_inc(&req->refs); | |
355fb9e2 | 3435 | ret = io_req_task_work_add(req); |
bcf5a063 | 3436 | if (unlikely(ret)) { |
c2c4c83c JA |
3437 | struct task_struct *tsk; |
3438 | ||
bcf5a063 | 3439 | /* queue just for cancelation */ |
e7375122 | 3440 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3441 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3442 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3443 | wake_up_process(tsk); |
bcf5a063 | 3444 | } |
bcf5a063 JA |
3445 | return 1; |
3446 | } | |
3447 | ||
c1dd91d1 JA |
3448 | /* |
3449 | * This controls whether a given IO request should be armed for async page | |
3450 | * based retry. If we return false here, the request is handed to the async | |
3451 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3452 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3453 | * will either succeed because the page is now uptodate and unlocked, or it | |
3454 | * will register a callback when the page is unlocked at IO completion. Through | |
3455 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3456 | * That retry will attempt the buffered read again. The retry will generally | |
3457 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3458 | * async worker threads for a blocking retry. | |
3459 | */ | |
227c0c96 | 3460 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3461 | { |
e8c2bc1f JA |
3462 | struct io_async_rw *rw = req->async_data; |
3463 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3464 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3465 | |
bcf5a063 JA |
3466 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3467 | if (req->flags & REQ_F_NOWAIT) | |
3468 | return false; | |
f67676d1 | 3469 | |
227c0c96 | 3470 | /* Only for buffered IO */ |
3b2a4439 | 3471 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3472 | return false; |
3b2a4439 | 3473 | |
bcf5a063 JA |
3474 | /* |
3475 | * just use poll if we can, and don't attempt if the fs doesn't | |
3476 | * support callback based unlocks | |
3477 | */ | |
3478 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3479 | return false; | |
f67676d1 | 3480 | |
3b2a4439 JA |
3481 | wait->wait.func = io_async_buf_func; |
3482 | wait->wait.private = req; | |
3483 | wait->wait.flags = 0; | |
3484 | INIT_LIST_HEAD(&wait->wait.entry); | |
3485 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3486 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3487 | kiocb->ki_waitq = wait; |
3b2a4439 | 3488 | return true; |
bcf5a063 JA |
3489 | } |
3490 | ||
3491 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3492 | { | |
3493 | if (req->file->f_op->read_iter) | |
3494 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3495 | else if (req->file->f_op->read) |
4017eb91 | 3496 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3497 | else |
3498 | return -EINVAL; | |
f67676d1 JA |
3499 | } |
3500 | ||
a1d7c393 JA |
3501 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3502 | struct io_comp_state *cs) | |
2b188cc1 JA |
3503 | { |
3504 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3505 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3506 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3507 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3508 | ssize_t io_size, ret, ret2; |
f5cac8b1 | 3509 | bool no_async; |
ff6165b2 | 3510 | |
2846c481 | 3511 | if (rw) { |
e8c2bc1f | 3512 | iter = &rw->iter; |
2846c481 PB |
3513 | iovec = NULL; |
3514 | } else { | |
3515 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3516 | if (ret < 0) | |
3517 | return ret; | |
3518 | } | |
632546c4 | 3519 | io_size = iov_iter_count(iter); |
fa15bafb | 3520 | req->result = io_size; |
227c0c96 | 3521 | ret = 0; |
2b188cc1 | 3522 | |
fd6c2e4c JA |
3523 | /* Ensure we clear previously set non-block flag */ |
3524 | if (!force_nonblock) | |
29de5f6a | 3525 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3526 | else |
3527 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3528 | ||
fd6c2e4c | 3529 | |
24c74678 | 3530 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3531 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3532 | if (no_async) | |
f67676d1 | 3533 | goto copy_iov; |
9e645e11 | 3534 | |
632546c4 | 3535 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3536 | if (unlikely(ret)) |
3537 | goto out_free; | |
2b188cc1 | 3538 | |
227c0c96 | 3539 | ret = io_iter_do_read(req, iter); |
32960613 | 3540 | |
227c0c96 JA |
3541 | if (!ret) { |
3542 | goto done; | |
3543 | } else if (ret == -EIOCBQUEUED) { | |
3544 | ret = 0; | |
3545 | goto out_free; | |
3546 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3547 | /* IOPOLL retry should happen for io-wq threads */ |
3548 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3549 | goto done; |
355afaeb JA |
3550 | /* no retry on NONBLOCK marked file */ |
3551 | if (req->file->f_flags & O_NONBLOCK) | |
3552 | goto done; | |
84216315 | 3553 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3554 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a JA |
3555 | ret = 0; |
3556 | goto copy_iov; | |
227c0c96 | 3557 | } else if (ret < 0) { |
00d23d51 JA |
3558 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3559 | goto done; | |
227c0c96 JA |
3560 | } |
3561 | ||
3562 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 | 3563 | if (!iov_iter_count(iter) || !force_nonblock || |
9a173346 | 3564 | (req->file->f_flags & O_NONBLOCK) || !(req->flags & REQ_F_ISREG)) |
227c0c96 JA |
3565 | goto done; |
3566 | ||
3567 | io_size -= ret; | |
3568 | copy_iov: | |
3569 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3570 | if (ret2) { | |
3571 | ret = ret2; | |
3572 | goto out_free; | |
3573 | } | |
f5cac8b1 JA |
3574 | if (no_async) |
3575 | return -EAGAIN; | |
e8c2bc1f | 3576 | rw = req->async_data; |
227c0c96 JA |
3577 | /* it's copied and will be cleaned with ->io */ |
3578 | iovec = NULL; | |
3579 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3580 | iter = &rw->iter; |
227c0c96 | 3581 | retry: |
e8c2bc1f | 3582 | rw->bytes_done += ret; |
227c0c96 JA |
3583 | /* if we can retry, do so with the callbacks armed */ |
3584 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3585 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3586 | return -EAGAIN; | |
2b188cc1 | 3587 | } |
227c0c96 JA |
3588 | |
3589 | /* | |
3590 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3591 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3592 | * page gets unlocked. We can also get a partial read here, and if we | |
3593 | * do, then just retry at the new offset. | |
3594 | */ | |
3595 | ret = io_iter_do_read(req, iter); | |
3596 | if (ret == -EIOCBQUEUED) { | |
3597 | ret = 0; | |
3598 | goto out_free; | |
3599 | } else if (ret > 0 && ret < io_size) { | |
3600 | /* we got some bytes, but not all. retry. */ | |
3601 | goto retry; | |
3602 | } | |
3603 | done: | |
3604 | kiocb_done(kiocb, ret, cs); | |
3605 | ret = 0; | |
f67676d1 | 3606 | out_free: |
f261c168 | 3607 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3608 | if (iovec) |
6f2cc166 | 3609 | kfree(iovec); |
2b188cc1 JA |
3610 | return ret; |
3611 | } | |
3612 | ||
73debe68 | 3613 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3614 | { |
3615 | ssize_t ret; | |
3616 | ||
a88fc400 | 3617 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3618 | if (ret) |
3619 | return ret; | |
f67676d1 | 3620 | |
3529d8c2 JA |
3621 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3622 | return -EBADF; | |
f67676d1 | 3623 | |
5f798bea | 3624 | /* either don't need iovec imported or already have it */ |
2d199895 | 3625 | if (!req->async_data) |
3529d8c2 | 3626 | return 0; |
73debe68 | 3627 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3628 | } |
3629 | ||
a1d7c393 JA |
3630 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3631 | struct io_comp_state *cs) | |
2b188cc1 JA |
3632 | { |
3633 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3634 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3635 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3636 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3637 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3638 | |
2846c481 | 3639 | if (rw) { |
e8c2bc1f | 3640 | iter = &rw->iter; |
2846c481 PB |
3641 | iovec = NULL; |
3642 | } else { | |
3643 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3644 | if (ret < 0) | |
3645 | return ret; | |
3646 | } | |
632546c4 | 3647 | io_size = iov_iter_count(iter); |
fa15bafb | 3648 | req->result = io_size; |
2b188cc1 | 3649 | |
fd6c2e4c JA |
3650 | /* Ensure we clear previously set non-block flag */ |
3651 | if (!force_nonblock) | |
a88fc400 PB |
3652 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3653 | else | |
3654 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3655 | |
24c74678 | 3656 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3657 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3658 | goto copy_iov; |
31b51510 | 3659 | |
10d59345 JA |
3660 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3661 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3662 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3663 | goto copy_iov; |
31b51510 | 3664 | |
632546c4 | 3665 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3666 | if (unlikely(ret)) |
3667 | goto out_free; | |
4ed734b0 | 3668 | |
fa15bafb PB |
3669 | /* |
3670 | * Open-code file_start_write here to grab freeze protection, | |
3671 | * which will be released by another thread in | |
3672 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3673 | * released so that it doesn't complain about the held lock when | |
3674 | * we return to userspace. | |
3675 | */ | |
3676 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3677 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3678 | __sb_writers_release(file_inode(req->file)->i_sb, |
3679 | SB_FREEZE_WRITE); | |
3680 | } | |
3681 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3682 | |
fa15bafb | 3683 | if (req->file->f_op->write_iter) |
ff6165b2 | 3684 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3685 | else if (req->file->f_op->write) |
4017eb91 | 3686 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3687 | else |
3688 | ret2 = -EINVAL; | |
4ed734b0 | 3689 | |
fa15bafb PB |
3690 | /* |
3691 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3692 | * retry them without IOCB_NOWAIT. | |
3693 | */ | |
3694 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3695 | ret2 = -EAGAIN; | |
355afaeb JA |
3696 | /* no retry on NONBLOCK marked file */ |
3697 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3698 | goto done; | |
fa15bafb | 3699 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3700 | /* IOPOLL retry should happen for io-wq threads */ |
3701 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3702 | goto copy_iov; | |
355afaeb | 3703 | done: |
fa15bafb PB |
3704 | kiocb_done(kiocb, ret2, cs); |
3705 | } else { | |
f67676d1 | 3706 | copy_iov: |
84216315 | 3707 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3708 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3709 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3710 | if (!ret) |
3711 | return -EAGAIN; | |
2b188cc1 | 3712 | } |
31b51510 | 3713 | out_free: |
f261c168 | 3714 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3715 | if (iovec) |
6f2cc166 | 3716 | kfree(iovec); |
2b188cc1 JA |
3717 | return ret; |
3718 | } | |
3719 | ||
80a261fd JA |
3720 | static int io_renameat_prep(struct io_kiocb *req, |
3721 | const struct io_uring_sqe *sqe) | |
3722 | { | |
3723 | struct io_rename *ren = &req->rename; | |
3724 | const char __user *oldf, *newf; | |
3725 | ||
3726 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3727 | return -EBADF; | |
3728 | ||
3729 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3730 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3731 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3732 | ren->new_dfd = READ_ONCE(sqe->len); | |
3733 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3734 | ||
3735 | ren->oldpath = getname(oldf); | |
3736 | if (IS_ERR(ren->oldpath)) | |
3737 | return PTR_ERR(ren->oldpath); | |
3738 | ||
3739 | ren->newpath = getname(newf); | |
3740 | if (IS_ERR(ren->newpath)) { | |
3741 | putname(ren->oldpath); | |
3742 | return PTR_ERR(ren->newpath); | |
3743 | } | |
3744 | ||
3745 | req->flags |= REQ_F_NEED_CLEANUP; | |
3746 | return 0; | |
3747 | } | |
3748 | ||
3749 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3750 | { | |
3751 | struct io_rename *ren = &req->rename; | |
3752 | int ret; | |
3753 | ||
3754 | if (force_nonblock) | |
3755 | return -EAGAIN; | |
3756 | ||
3757 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3758 | ren->newpath, ren->flags); | |
3759 | ||
3760 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3761 | if (ret < 0) | |
3762 | req_set_fail_links(req); | |
3763 | io_req_complete(req, ret); | |
3764 | return 0; | |
3765 | } | |
3766 | ||
14a1143b JA |
3767 | static int io_unlinkat_prep(struct io_kiocb *req, |
3768 | const struct io_uring_sqe *sqe) | |
3769 | { | |
3770 | struct io_unlink *un = &req->unlink; | |
3771 | const char __user *fname; | |
3772 | ||
3773 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3774 | return -EBADF; | |
3775 | ||
3776 | un->dfd = READ_ONCE(sqe->fd); | |
3777 | ||
3778 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3779 | if (un->flags & ~AT_REMOVEDIR) | |
3780 | return -EINVAL; | |
3781 | ||
3782 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3783 | un->filename = getname(fname); | |
3784 | if (IS_ERR(un->filename)) | |
3785 | return PTR_ERR(un->filename); | |
3786 | ||
3787 | req->flags |= REQ_F_NEED_CLEANUP; | |
3788 | return 0; | |
3789 | } | |
3790 | ||
3791 | static int io_unlinkat(struct io_kiocb *req, bool force_nonblock) | |
3792 | { | |
3793 | struct io_unlink *un = &req->unlink; | |
3794 | int ret; | |
3795 | ||
3796 | if (force_nonblock) | |
3797 | return -EAGAIN; | |
3798 | ||
3799 | if (un->flags & AT_REMOVEDIR) | |
3800 | ret = do_rmdir(un->dfd, un->filename); | |
3801 | else | |
3802 | ret = do_unlinkat(un->dfd, un->filename); | |
3803 | ||
3804 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3805 | if (ret < 0) | |
3806 | req_set_fail_links(req); | |
3807 | io_req_complete(req, ret); | |
3808 | return 0; | |
3809 | } | |
3810 | ||
36f4fa68 JA |
3811 | static int io_shutdown_prep(struct io_kiocb *req, |
3812 | const struct io_uring_sqe *sqe) | |
3813 | { | |
3814 | #if defined(CONFIG_NET) | |
3815 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3816 | return -EINVAL; | |
3817 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3818 | sqe->buf_index) | |
3819 | return -EINVAL; | |
3820 | ||
3821 | req->shutdown.how = READ_ONCE(sqe->len); | |
3822 | return 0; | |
3823 | #else | |
3824 | return -EOPNOTSUPP; | |
3825 | #endif | |
3826 | } | |
3827 | ||
3828 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3829 | { | |
3830 | #if defined(CONFIG_NET) | |
3831 | struct socket *sock; | |
3832 | int ret; | |
3833 | ||
3834 | if (force_nonblock) | |
3835 | return -EAGAIN; | |
3836 | ||
48aba79b | 3837 | sock = sock_from_file(req->file); |
36f4fa68 | 3838 | if (unlikely(!sock)) |
48aba79b | 3839 | return -ENOTSOCK; |
36f4fa68 JA |
3840 | |
3841 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d JA |
3842 | if (ret < 0) |
3843 | req_set_fail_links(req); | |
36f4fa68 JA |
3844 | io_req_complete(req, ret); |
3845 | return 0; | |
3846 | #else | |
3847 | return -EOPNOTSUPP; | |
3848 | #endif | |
3849 | } | |
3850 | ||
f2a8d5c7 PB |
3851 | static int __io_splice_prep(struct io_kiocb *req, |
3852 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3853 | { |
3854 | struct io_splice* sp = &req->splice; | |
3855 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3856 | |
3232dd02 PB |
3857 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3858 | return -EINVAL; | |
7d67af2c PB |
3859 | |
3860 | sp->file_in = NULL; | |
7d67af2c PB |
3861 | sp->len = READ_ONCE(sqe->len); |
3862 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3863 | ||
3864 | if (unlikely(sp->flags & ~valid_flags)) | |
3865 | return -EINVAL; | |
3866 | ||
8371adf5 PB |
3867 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3868 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3869 | if (!sp->file_in) | |
3870 | return -EBADF; | |
7d67af2c PB |
3871 | req->flags |= REQ_F_NEED_CLEANUP; |
3872 | ||
7cdaf587 XW |
3873 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3874 | /* | |
3875 | * Splice operation will be punted aync, and here need to | |
3876 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3877 | */ | |
3878 | io_req_init_async(req); | |
7d67af2c | 3879 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3880 | } |
7d67af2c PB |
3881 | |
3882 | return 0; | |
3883 | } | |
3884 | ||
f2a8d5c7 PB |
3885 | static int io_tee_prep(struct io_kiocb *req, |
3886 | const struct io_uring_sqe *sqe) | |
3887 | { | |
3888 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3889 | return -EINVAL; | |
3890 | return __io_splice_prep(req, sqe); | |
3891 | } | |
3892 | ||
3893 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3894 | { | |
3895 | struct io_splice *sp = &req->splice; | |
3896 | struct file *in = sp->file_in; | |
3897 | struct file *out = sp->file_out; | |
3898 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3899 | long ret = 0; | |
3900 | ||
3901 | if (force_nonblock) | |
3902 | return -EAGAIN; | |
3903 | if (sp->len) | |
3904 | ret = do_tee(in, out, sp->len, flags); | |
3905 | ||
3906 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3907 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3908 | ||
f2a8d5c7 PB |
3909 | if (ret != sp->len) |
3910 | req_set_fail_links(req); | |
e1e16097 | 3911 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3912 | return 0; |
3913 | } | |
3914 | ||
3915 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3916 | { | |
3917 | struct io_splice* sp = &req->splice; | |
3918 | ||
3919 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3920 | sp->off_out = READ_ONCE(sqe->off); | |
3921 | return __io_splice_prep(req, sqe); | |
3922 | } | |
3923 | ||
014db007 | 3924 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3925 | { |
3926 | struct io_splice *sp = &req->splice; | |
3927 | struct file *in = sp->file_in; | |
3928 | struct file *out = sp->file_out; | |
3929 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3930 | loff_t *poff_in, *poff_out; | |
c9687426 | 3931 | long ret = 0; |
7d67af2c | 3932 | |
2fb3e822 PB |
3933 | if (force_nonblock) |
3934 | return -EAGAIN; | |
7d67af2c PB |
3935 | |
3936 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3937 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3938 | |
948a7749 | 3939 | if (sp->len) |
c9687426 | 3940 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3941 | |
3942 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3943 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3944 | ||
7d67af2c PB |
3945 | if (ret != sp->len) |
3946 | req_set_fail_links(req); | |
e1e16097 | 3947 | io_req_complete(req, ret); |
7d67af2c PB |
3948 | return 0; |
3949 | } | |
3950 | ||
2b188cc1 JA |
3951 | /* |
3952 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3953 | */ | |
229a7b63 | 3954 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3955 | { |
3956 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3957 | |
def596e9 JA |
3958 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3959 | return -EINVAL; | |
3960 | ||
229a7b63 | 3961 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3962 | return 0; |
3963 | } | |
3964 | ||
3529d8c2 | 3965 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3966 | { |
6b06314c | 3967 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3968 | |
09bb8394 JA |
3969 | if (!req->file) |
3970 | return -EBADF; | |
c992fe29 | 3971 | |
6b06314c | 3972 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3973 | return -EINVAL; |
edafccee | 3974 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3975 | return -EINVAL; |
3976 | ||
8ed8d3c3 JA |
3977 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3978 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3979 | return -EINVAL; | |
3980 | ||
3981 | req->sync.off = READ_ONCE(sqe->off); | |
3982 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3983 | return 0; |
3984 | } | |
3985 | ||
ac45abc0 | 3986 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3987 | { |
8ed8d3c3 | 3988 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3989 | int ret; |
3990 | ||
ac45abc0 PB |
3991 | /* fsync always requires a blocking context */ |
3992 | if (force_nonblock) | |
3993 | return -EAGAIN; | |
3994 | ||
9adbd45d | 3995 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3996 | end > 0 ? end : LLONG_MAX, |
3997 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3998 | if (ret < 0) | |
3999 | req_set_fail_links(req); | |
e1e16097 | 4000 | io_req_complete(req, ret); |
c992fe29 CH |
4001 | return 0; |
4002 | } | |
4003 | ||
d63d1b5e JA |
4004 | static int io_fallocate_prep(struct io_kiocb *req, |
4005 | const struct io_uring_sqe *sqe) | |
4006 | { | |
4007 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
4008 | return -EINVAL; | |
3232dd02 PB |
4009 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4010 | return -EINVAL; | |
d63d1b5e JA |
4011 | |
4012 | req->sync.off = READ_ONCE(sqe->off); | |
4013 | req->sync.len = READ_ONCE(sqe->addr); | |
4014 | req->sync.mode = READ_ONCE(sqe->len); | |
4015 | return 0; | |
4016 | } | |
4017 | ||
014db007 | 4018 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 4019 | { |
ac45abc0 PB |
4020 | int ret; |
4021 | ||
d63d1b5e | 4022 | /* fallocate always requiring blocking context */ |
ac45abc0 | 4023 | if (force_nonblock) |
5d17b4a4 | 4024 | return -EAGAIN; |
ac45abc0 PB |
4025 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4026 | req->sync.len); | |
ac45abc0 PB |
4027 | if (ret < 0) |
4028 | req_set_fail_links(req); | |
e1e16097 | 4029 | io_req_complete(req, ret); |
5d17b4a4 JA |
4030 | return 0; |
4031 | } | |
4032 | ||
ec65fea5 | 4033 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4034 | { |
f8748881 | 4035 | const char __user *fname; |
15b71abe | 4036 | int ret; |
b7bb4f7d | 4037 | |
ec65fea5 | 4038 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4039 | return -EINVAL; |
ec65fea5 | 4040 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4041 | return -EBADF; |
03b1230c | 4042 | |
ec65fea5 PB |
4043 | /* open.how should be already initialised */ |
4044 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4045 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4046 | |
25e72d10 PB |
4047 | req->open.dfd = READ_ONCE(sqe->fd); |
4048 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4049 | req->open.filename = getname(fname); |
15b71abe JA |
4050 | if (IS_ERR(req->open.filename)) { |
4051 | ret = PTR_ERR(req->open.filename); | |
4052 | req->open.filename = NULL; | |
4053 | return ret; | |
4054 | } | |
4022e7af | 4055 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4056 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4057 | return 0; |
03b1230c JA |
4058 | } |
4059 | ||
ec65fea5 PB |
4060 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4061 | { | |
4062 | u64 flags, mode; | |
4063 | ||
14587a46 | 4064 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4065 | return -EINVAL; |
ec65fea5 PB |
4066 | mode = READ_ONCE(sqe->len); |
4067 | flags = READ_ONCE(sqe->open_flags); | |
4068 | req->open.how = build_open_how(flags, mode); | |
4069 | return __io_openat_prep(req, sqe); | |
4070 | } | |
4071 | ||
cebdb986 | 4072 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4073 | { |
cebdb986 | 4074 | struct open_how __user *how; |
cebdb986 | 4075 | size_t len; |
0fa03c62 JA |
4076 | int ret; |
4077 | ||
14587a46 | 4078 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4079 | return -EINVAL; |
cebdb986 JA |
4080 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4081 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4082 | if (len < OPEN_HOW_SIZE_VER0) |
4083 | return -EINVAL; | |
3529d8c2 | 4084 | |
cebdb986 JA |
4085 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4086 | len); | |
4087 | if (ret) | |
4088 | return ret; | |
3529d8c2 | 4089 | |
ec65fea5 | 4090 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4091 | } |
4092 | ||
014db007 | 4093 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
4094 | { |
4095 | struct open_flags op; | |
15b71abe | 4096 | struct file *file; |
3a81fd02 JA |
4097 | bool nonblock_set; |
4098 | bool resolve_nonblock; | |
15b71abe JA |
4099 | int ret; |
4100 | ||
cebdb986 | 4101 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4102 | if (ret) |
4103 | goto err; | |
3a81fd02 JA |
4104 | nonblock_set = op.open_flag & O_NONBLOCK; |
4105 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
4106 | if (force_nonblock) { | |
4107 | /* | |
4108 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4109 | * it'll always -EAGAIN | |
4110 | */ | |
4111 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4112 | return -EAGAIN; | |
4113 | op.lookup_flags |= LOOKUP_CACHED; | |
4114 | op.open_flag |= O_NONBLOCK; | |
4115 | } | |
15b71abe | 4116 | |
4022e7af | 4117 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4118 | if (ret < 0) |
4119 | goto err; | |
4120 | ||
4121 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3a81fd02 JA |
4122 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4123 | if ((!resolve_nonblock && force_nonblock) && file == ERR_PTR(-EAGAIN)) { | |
4124 | /* | |
4125 | * We could hang on to this 'fd', but seems like marginal | |
4126 | * gain for something that is now known to be a slower path. | |
4127 | * So just put it, and we'll get a new one when we retry. | |
4128 | */ | |
4129 | put_unused_fd(ret); | |
4130 | return -EAGAIN; | |
4131 | } | |
4132 | ||
15b71abe JA |
4133 | if (IS_ERR(file)) { |
4134 | put_unused_fd(ret); | |
4135 | ret = PTR_ERR(file); | |
4136 | } else { | |
3a81fd02 JA |
4137 | if (force_nonblock && !nonblock_set) |
4138 | file->f_flags &= ~O_NONBLOCK; | |
15b71abe JA |
4139 | fsnotify_open(file); |
4140 | fd_install(ret, file); | |
4141 | } | |
4142 | err: | |
4143 | putname(req->open.filename); | |
8fef80bf | 4144 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4145 | if (ret < 0) |
4146 | req_set_fail_links(req); | |
e1e16097 | 4147 | io_req_complete(req, ret); |
15b71abe JA |
4148 | return 0; |
4149 | } | |
4150 | ||
014db007 | 4151 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4152 | { |
014db007 | 4153 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4154 | } |
4155 | ||
067524e9 JA |
4156 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4157 | const struct io_uring_sqe *sqe) | |
4158 | { | |
4159 | struct io_provide_buf *p = &req->pbuf; | |
4160 | u64 tmp; | |
4161 | ||
4162 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4163 | return -EINVAL; | |
4164 | ||
4165 | tmp = READ_ONCE(sqe->fd); | |
4166 | if (!tmp || tmp > USHRT_MAX) | |
4167 | return -EINVAL; | |
4168 | ||
4169 | memset(p, 0, sizeof(*p)); | |
4170 | p->nbufs = tmp; | |
4171 | p->bgid = READ_ONCE(sqe->buf_group); | |
4172 | return 0; | |
4173 | } | |
4174 | ||
4175 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4176 | int bgid, unsigned nbufs) | |
4177 | { | |
4178 | unsigned i = 0; | |
4179 | ||
4180 | /* shouldn't happen */ | |
4181 | if (!nbufs) | |
4182 | return 0; | |
4183 | ||
4184 | /* the head kbuf is the list itself */ | |
4185 | while (!list_empty(&buf->list)) { | |
4186 | struct io_buffer *nxt; | |
4187 | ||
4188 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4189 | list_del(&nxt->list); | |
4190 | kfree(nxt); | |
4191 | if (++i == nbufs) | |
4192 | return i; | |
4193 | } | |
4194 | i++; | |
4195 | kfree(buf); | |
4196 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4197 | ||
4198 | return i; | |
4199 | } | |
4200 | ||
229a7b63 JA |
4201 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4202 | struct io_comp_state *cs) | |
067524e9 JA |
4203 | { |
4204 | struct io_provide_buf *p = &req->pbuf; | |
4205 | struct io_ring_ctx *ctx = req->ctx; | |
4206 | struct io_buffer *head; | |
4207 | int ret = 0; | |
4208 | ||
4209 | io_ring_submit_lock(ctx, !force_nonblock); | |
4210 | ||
4211 | lockdep_assert_held(&ctx->uring_lock); | |
4212 | ||
4213 | ret = -ENOENT; | |
4214 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4215 | if (head) | |
4216 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 JA |
4217 | if (ret < 0) |
4218 | req_set_fail_links(req); | |
067524e9 | 4219 | |
31bff9a5 PB |
4220 | /* need to hold the lock to complete IOPOLL requests */ |
4221 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
4222 | __io_req_complete(req, ret, 0, cs); | |
4223 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4224 | } else { | |
4225 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4226 | __io_req_complete(req, ret, 0, cs); | |
4227 | } | |
067524e9 JA |
4228 | return 0; |
4229 | } | |
4230 | ||
ddf0322d JA |
4231 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4232 | const struct io_uring_sqe *sqe) | |
4233 | { | |
4234 | struct io_provide_buf *p = &req->pbuf; | |
4235 | u64 tmp; | |
4236 | ||
4237 | if (sqe->ioprio || sqe->rw_flags) | |
4238 | return -EINVAL; | |
4239 | ||
4240 | tmp = READ_ONCE(sqe->fd); | |
4241 | if (!tmp || tmp > USHRT_MAX) | |
4242 | return -E2BIG; | |
4243 | p->nbufs = tmp; | |
4244 | p->addr = READ_ONCE(sqe->addr); | |
4245 | p->len = READ_ONCE(sqe->len); | |
4246 | ||
efe68c1c | 4247 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4248 | return -EFAULT; |
4249 | ||
4250 | p->bgid = READ_ONCE(sqe->buf_group); | |
4251 | tmp = READ_ONCE(sqe->off); | |
4252 | if (tmp > USHRT_MAX) | |
4253 | return -E2BIG; | |
4254 | p->bid = tmp; | |
4255 | return 0; | |
4256 | } | |
4257 | ||
4258 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4259 | { | |
4260 | struct io_buffer *buf; | |
4261 | u64 addr = pbuf->addr; | |
4262 | int i, bid = pbuf->bid; | |
4263 | ||
4264 | for (i = 0; i < pbuf->nbufs; i++) { | |
4265 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4266 | if (!buf) | |
4267 | break; | |
4268 | ||
4269 | buf->addr = addr; | |
4270 | buf->len = pbuf->len; | |
4271 | buf->bid = bid; | |
4272 | addr += pbuf->len; | |
4273 | bid++; | |
4274 | if (!*head) { | |
4275 | INIT_LIST_HEAD(&buf->list); | |
4276 | *head = buf; | |
4277 | } else { | |
4278 | list_add_tail(&buf->list, &(*head)->list); | |
4279 | } | |
4280 | } | |
4281 | ||
4282 | return i ? i : -ENOMEM; | |
4283 | } | |
4284 | ||
229a7b63 JA |
4285 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4286 | struct io_comp_state *cs) | |
ddf0322d JA |
4287 | { |
4288 | struct io_provide_buf *p = &req->pbuf; | |
4289 | struct io_ring_ctx *ctx = req->ctx; | |
4290 | struct io_buffer *head, *list; | |
4291 | int ret = 0; | |
4292 | ||
4293 | io_ring_submit_lock(ctx, !force_nonblock); | |
4294 | ||
4295 | lockdep_assert_held(&ctx->uring_lock); | |
4296 | ||
4297 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4298 | ||
4299 | ret = io_add_buffers(p, &head); | |
4300 | if (ret < 0) | |
4301 | goto out; | |
4302 | ||
4303 | if (!list) { | |
4304 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4305 | GFP_KERNEL); | |
4306 | if (ret < 0) { | |
067524e9 | 4307 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4308 | goto out; |
4309 | } | |
4310 | } | |
4311 | out: | |
ddf0322d JA |
4312 | if (ret < 0) |
4313 | req_set_fail_links(req); | |
31bff9a5 PB |
4314 | |
4315 | /* need to hold the lock to complete IOPOLL requests */ | |
4316 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
4317 | __io_req_complete(req, ret, 0, cs); | |
4318 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4319 | } else { | |
4320 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4321 | __io_req_complete(req, ret, 0, cs); | |
4322 | } | |
ddf0322d | 4323 | return 0; |
cebdb986 JA |
4324 | } |
4325 | ||
3e4827b0 JA |
4326 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4327 | const struct io_uring_sqe *sqe) | |
4328 | { | |
4329 | #if defined(CONFIG_EPOLL) | |
4330 | if (sqe->ioprio || sqe->buf_index) | |
4331 | return -EINVAL; | |
6ca56f84 | 4332 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4333 | return -EINVAL; |
3e4827b0 JA |
4334 | |
4335 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4336 | req->epoll.op = READ_ONCE(sqe->len); | |
4337 | req->epoll.fd = READ_ONCE(sqe->off); | |
4338 | ||
4339 | if (ep_op_has_event(req->epoll.op)) { | |
4340 | struct epoll_event __user *ev; | |
4341 | ||
4342 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4343 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4344 | return -EFAULT; | |
4345 | } | |
4346 | ||
4347 | return 0; | |
4348 | #else | |
4349 | return -EOPNOTSUPP; | |
4350 | #endif | |
4351 | } | |
4352 | ||
229a7b63 JA |
4353 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4354 | struct io_comp_state *cs) | |
3e4827b0 JA |
4355 | { |
4356 | #if defined(CONFIG_EPOLL) | |
4357 | struct io_epoll *ie = &req->epoll; | |
4358 | int ret; | |
4359 | ||
4360 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4361 | if (force_nonblock && ret == -EAGAIN) | |
4362 | return -EAGAIN; | |
4363 | ||
4364 | if (ret < 0) | |
4365 | req_set_fail_links(req); | |
229a7b63 | 4366 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4367 | return 0; |
4368 | #else | |
4369 | return -EOPNOTSUPP; | |
4370 | #endif | |
4371 | } | |
4372 | ||
c1ca757b JA |
4373 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4374 | { | |
4375 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4376 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4377 | return -EINVAL; | |
3232dd02 PB |
4378 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4379 | return -EINVAL; | |
c1ca757b JA |
4380 | |
4381 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4382 | req->madvise.len = READ_ONCE(sqe->len); | |
4383 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4384 | return 0; | |
4385 | #else | |
4386 | return -EOPNOTSUPP; | |
4387 | #endif | |
4388 | } | |
4389 | ||
014db007 | 4390 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4391 | { |
4392 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4393 | struct io_madvise *ma = &req->madvise; | |
4394 | int ret; | |
4395 | ||
4396 | if (force_nonblock) | |
4397 | return -EAGAIN; | |
4398 | ||
0726b01e | 4399 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4400 | if (ret < 0) |
4401 | req_set_fail_links(req); | |
e1e16097 | 4402 | io_req_complete(req, ret); |
c1ca757b JA |
4403 | return 0; |
4404 | #else | |
4405 | return -EOPNOTSUPP; | |
4406 | #endif | |
4407 | } | |
4408 | ||
4840e418 JA |
4409 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4410 | { | |
4411 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4412 | return -EINVAL; | |
3232dd02 PB |
4413 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4414 | return -EINVAL; | |
4840e418 JA |
4415 | |
4416 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4417 | req->fadvise.len = READ_ONCE(sqe->len); | |
4418 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4419 | return 0; | |
4420 | } | |
4421 | ||
014db007 | 4422 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4423 | { |
4424 | struct io_fadvise *fa = &req->fadvise; | |
4425 | int ret; | |
4426 | ||
3e69426d JA |
4427 | if (force_nonblock) { |
4428 | switch (fa->advice) { | |
4429 | case POSIX_FADV_NORMAL: | |
4430 | case POSIX_FADV_RANDOM: | |
4431 | case POSIX_FADV_SEQUENTIAL: | |
4432 | break; | |
4433 | default: | |
4434 | return -EAGAIN; | |
4435 | } | |
4436 | } | |
4840e418 JA |
4437 | |
4438 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4439 | if (ret < 0) | |
4440 | req_set_fail_links(req); | |
e1e16097 | 4441 | io_req_complete(req, ret); |
4840e418 JA |
4442 | return 0; |
4443 | } | |
4444 | ||
eddc7ef5 JA |
4445 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4446 | { | |
6ca56f84 | 4447 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4448 | return -EINVAL; |
eddc7ef5 JA |
4449 | if (sqe->ioprio || sqe->buf_index) |
4450 | return -EINVAL; | |
9c280f90 | 4451 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4452 | return -EBADF; |
eddc7ef5 | 4453 | |
1d9e1288 BM |
4454 | req->statx.dfd = READ_ONCE(sqe->fd); |
4455 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4456 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4457 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4458 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4459 | |
4460 | return 0; | |
4461 | } | |
4462 | ||
014db007 | 4463 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4464 | { |
1d9e1288 | 4465 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4466 | int ret; |
4467 | ||
5b0bbee4 JA |
4468 | if (force_nonblock) { |
4469 | /* only need file table for an actual valid fd */ | |
4470 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4471 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4472 | return -EAGAIN; |
5b0bbee4 | 4473 | } |
eddc7ef5 | 4474 | |
e62753e4 BM |
4475 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4476 | ctx->buffer); | |
eddc7ef5 | 4477 | |
eddc7ef5 JA |
4478 | if (ret < 0) |
4479 | req_set_fail_links(req); | |
e1e16097 | 4480 | io_req_complete(req, ret); |
eddc7ef5 JA |
4481 | return 0; |
4482 | } | |
4483 | ||
b5dba59e JA |
4484 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4485 | { | |
4486 | /* | |
4487 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4488 | * leave the 'file' in an undeterminate state, and here need to modify |
4489 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4490 | */ |
7cdaf587 | 4491 | io_req_init_async(req); |
b5dba59e | 4492 | |
14587a46 | 4493 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4494 | return -EINVAL; |
b5dba59e JA |
4495 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4496 | sqe->rw_flags || sqe->buf_index) | |
4497 | return -EINVAL; | |
9c280f90 | 4498 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4499 | return -EBADF; |
b5dba59e JA |
4500 | |
4501 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4502 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4503 | return -EBADF; |
b5dba59e | 4504 | |
3af73b28 | 4505 | req->close.put_file = NULL; |
b5dba59e | 4506 | return 0; |
b5dba59e JA |
4507 | } |
4508 | ||
229a7b63 JA |
4509 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4510 | struct io_comp_state *cs) | |
b5dba59e | 4511 | { |
3af73b28 | 4512 | struct io_close *close = &req->close; |
b5dba59e JA |
4513 | int ret; |
4514 | ||
3af73b28 PB |
4515 | /* might be already done during nonblock submission */ |
4516 | if (!close->put_file) { | |
9fe83c43 | 4517 | ret = close_fd_get_file(close->fd, &close->put_file); |
3af73b28 PB |
4518 | if (ret < 0) |
4519 | return (ret == -ENOENT) ? -EBADF : ret; | |
4520 | } | |
b5dba59e JA |
4521 | |
4522 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4523 | if (close->put_file->f_op->flush && force_nonblock) { |
607ec89e JA |
4524 | /* not safe to cancel at this point */ |
4525 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | |
24c74678 PB |
4526 | /* was never set, but play safe */ |
4527 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4528 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4529 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4530 | return -EAGAIN; |
a2100672 | 4531 | } |
b5dba59e | 4532 | |
3af73b28 | 4533 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4534 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4535 | if (ret < 0) |
4536 | req_set_fail_links(req); | |
3af73b28 PB |
4537 | fput(close->put_file); |
4538 | close->put_file = NULL; | |
229a7b63 | 4539 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4540 | return 0; |
b5dba59e JA |
4541 | } |
4542 | ||
3529d8c2 | 4543 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4544 | { |
4545 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4546 | |
4547 | if (!req->file) | |
4548 | return -EBADF; | |
5d17b4a4 JA |
4549 | |
4550 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4551 | return -EINVAL; | |
4552 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4553 | return -EINVAL; | |
4554 | ||
8ed8d3c3 JA |
4555 | req->sync.off = READ_ONCE(sqe->off); |
4556 | req->sync.len = READ_ONCE(sqe->len); | |
4557 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4558 | return 0; |
4559 | } | |
4560 | ||
ac45abc0 | 4561 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4562 | { |
8ed8d3c3 JA |
4563 | int ret; |
4564 | ||
ac45abc0 PB |
4565 | /* sync_file_range always requires a blocking context */ |
4566 | if (force_nonblock) | |
4567 | return -EAGAIN; | |
4568 | ||
9adbd45d | 4569 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4570 | req->sync.flags); |
4571 | if (ret < 0) | |
4572 | req_set_fail_links(req); | |
e1e16097 | 4573 | io_req_complete(req, ret); |
5d17b4a4 JA |
4574 | return 0; |
4575 | } | |
4576 | ||
469956e8 | 4577 | #if defined(CONFIG_NET) |
02d27d89 PB |
4578 | static int io_setup_async_msg(struct io_kiocb *req, |
4579 | struct io_async_msghdr *kmsg) | |
4580 | { | |
e8c2bc1f JA |
4581 | struct io_async_msghdr *async_msg = req->async_data; |
4582 | ||
4583 | if (async_msg) | |
02d27d89 | 4584 | return -EAGAIN; |
e8c2bc1f | 4585 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4586 | if (kmsg->iov != kmsg->fast_iov) |
4587 | kfree(kmsg->iov); | |
4588 | return -ENOMEM; | |
4589 | } | |
e8c2bc1f | 4590 | async_msg = req->async_data; |
02d27d89 | 4591 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4592 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4593 | return -EAGAIN; |
4594 | } | |
4595 | ||
2ae523ed PB |
4596 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4597 | struct io_async_msghdr *iomsg) | |
4598 | { | |
4599 | iomsg->iov = iomsg->fast_iov; | |
4600 | iomsg->msg.msg_name = &iomsg->addr; | |
4601 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4602 | req->sr_msg.msg_flags, &iomsg->iov); | |
4603 | } | |
4604 | ||
3529d8c2 | 4605 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4606 | { |
e8c2bc1f | 4607 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4608 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4609 | int ret; |
03b1230c | 4610 | |
d2b6f48b PB |
4611 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4612 | return -EINVAL; | |
4613 | ||
e47293fd | 4614 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4615 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4616 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4617 | |
d8768362 JA |
4618 | #ifdef CONFIG_COMPAT |
4619 | if (req->ctx->compat) | |
4620 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4621 | #endif | |
4622 | ||
e8c2bc1f | 4623 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4624 | return 0; |
e8c2bc1f | 4625 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4626 | if (!ret) |
4627 | req->flags |= REQ_F_NEED_CLEANUP; | |
4628 | return ret; | |
03b1230c JA |
4629 | } |
4630 | ||
229a7b63 JA |
4631 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4632 | struct io_comp_state *cs) | |
aa1fa28f | 4633 | { |
6b754c8b | 4634 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4635 | struct socket *sock; |
7a7cacba | 4636 | unsigned flags; |
0fa03c62 JA |
4637 | int ret; |
4638 | ||
dba4a925 | 4639 | sock = sock_from_file(req->file); |
7a7cacba | 4640 | if (unlikely(!sock)) |
dba4a925 | 4641 | return -ENOTSOCK; |
3529d8c2 | 4642 | |
e8c2bc1f JA |
4643 | if (req->async_data) { |
4644 | kmsg = req->async_data; | |
4645 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4646 | /* if iov is set, it's allocated already */ |
4647 | if (!kmsg->iov) | |
4648 | kmsg->iov = kmsg->fast_iov; | |
4649 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4650 | } else { | |
4651 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4652 | if (ret) | |
4653 | return ret; | |
4654 | kmsg = &iomsg; | |
0fa03c62 | 4655 | } |
0fa03c62 | 4656 | |
7a7cacba PB |
4657 | flags = req->sr_msg.msg_flags; |
4658 | if (flags & MSG_DONTWAIT) | |
4659 | req->flags |= REQ_F_NOWAIT; | |
4660 | else if (force_nonblock) | |
4661 | flags |= MSG_DONTWAIT; | |
e47293fd | 4662 | |
7a7cacba PB |
4663 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4664 | if (force_nonblock && ret == -EAGAIN) | |
4665 | return io_setup_async_msg(req, kmsg); | |
4666 | if (ret == -ERESTARTSYS) | |
4667 | ret = -EINTR; | |
0fa03c62 | 4668 | |
6b754c8b | 4669 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4670 | kfree(kmsg->iov); |
99bc4c38 | 4671 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4672 | if (ret < 0) |
4673 | req_set_fail_links(req); | |
229a7b63 | 4674 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4675 | return 0; |
03b1230c | 4676 | } |
aa1fa28f | 4677 | |
229a7b63 JA |
4678 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4679 | struct io_comp_state *cs) | |
fddaface | 4680 | { |
7a7cacba PB |
4681 | struct io_sr_msg *sr = &req->sr_msg; |
4682 | struct msghdr msg; | |
4683 | struct iovec iov; | |
fddaface | 4684 | struct socket *sock; |
7a7cacba | 4685 | unsigned flags; |
fddaface JA |
4686 | int ret; |
4687 | ||
dba4a925 | 4688 | sock = sock_from_file(req->file); |
7a7cacba | 4689 | if (unlikely(!sock)) |
dba4a925 | 4690 | return -ENOTSOCK; |
fddaface | 4691 | |
7a7cacba PB |
4692 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4693 | if (unlikely(ret)) | |
14db8411 | 4694 | return ret; |
fddaface | 4695 | |
7a7cacba PB |
4696 | msg.msg_name = NULL; |
4697 | msg.msg_control = NULL; | |
4698 | msg.msg_controllen = 0; | |
4699 | msg.msg_namelen = 0; | |
fddaface | 4700 | |
7a7cacba PB |
4701 | flags = req->sr_msg.msg_flags; |
4702 | if (flags & MSG_DONTWAIT) | |
4703 | req->flags |= REQ_F_NOWAIT; | |
4704 | else if (force_nonblock) | |
4705 | flags |= MSG_DONTWAIT; | |
fddaface | 4706 | |
7a7cacba PB |
4707 | msg.msg_flags = flags; |
4708 | ret = sock_sendmsg(sock, &msg); | |
4709 | if (force_nonblock && ret == -EAGAIN) | |
4710 | return -EAGAIN; | |
4711 | if (ret == -ERESTARTSYS) | |
4712 | ret = -EINTR; | |
fddaface | 4713 | |
fddaface JA |
4714 | if (ret < 0) |
4715 | req_set_fail_links(req); | |
229a7b63 | 4716 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4717 | return 0; |
fddaface JA |
4718 | } |
4719 | ||
1400e697 PB |
4720 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4721 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4722 | { |
4723 | struct io_sr_msg *sr = &req->sr_msg; | |
4724 | struct iovec __user *uiov; | |
4725 | size_t iov_len; | |
4726 | int ret; | |
4727 | ||
1400e697 PB |
4728 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4729 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4730 | if (ret) |
4731 | return ret; | |
4732 | ||
4733 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4734 | if (iov_len > 1) | |
4735 | return -EINVAL; | |
1400e697 | 4736 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4737 | return -EFAULT; |
1400e697 PB |
4738 | sr->len = iomsg->iov[0].iov_len; |
4739 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4740 | sr->len); |
1400e697 | 4741 | iomsg->iov = NULL; |
52de1fe1 | 4742 | } else { |
89cd35c5 CH |
4743 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4744 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4745 | false); | |
52de1fe1 JA |
4746 | if (ret > 0) |
4747 | ret = 0; | |
4748 | } | |
4749 | ||
4750 | return ret; | |
4751 | } | |
4752 | ||
4753 | #ifdef CONFIG_COMPAT | |
4754 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4755 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4756 | { |
4757 | struct compat_msghdr __user *msg_compat; | |
4758 | struct io_sr_msg *sr = &req->sr_msg; | |
4759 | struct compat_iovec __user *uiov; | |
4760 | compat_uptr_t ptr; | |
4761 | compat_size_t len; | |
4762 | int ret; | |
4763 | ||
270a5940 | 4764 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4765 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4766 | &ptr, &len); |
4767 | if (ret) | |
4768 | return ret; | |
4769 | ||
4770 | uiov = compat_ptr(ptr); | |
4771 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4772 | compat_ssize_t clen; | |
4773 | ||
4774 | if (len > 1) | |
4775 | return -EINVAL; | |
4776 | if (!access_ok(uiov, sizeof(*uiov))) | |
4777 | return -EFAULT; | |
4778 | if (__get_user(clen, &uiov->iov_len)) | |
4779 | return -EFAULT; | |
4780 | if (clen < 0) | |
4781 | return -EINVAL; | |
2d280bc8 PB |
4782 | sr->len = clen; |
4783 | iomsg->iov[0].iov_len = clen; | |
1400e697 | 4784 | iomsg->iov = NULL; |
52de1fe1 | 4785 | } else { |
89cd35c5 CH |
4786 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4787 | UIO_FASTIOV, &iomsg->iov, | |
4788 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4789 | if (ret < 0) |
4790 | return ret; | |
4791 | } | |
4792 | ||
4793 | return 0; | |
4794 | } | |
4795 | #endif | |
4796 | ||
1400e697 PB |
4797 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4798 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4799 | { |
1400e697 PB |
4800 | iomsg->msg.msg_name = &iomsg->addr; |
4801 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4802 | |
4803 | #ifdef CONFIG_COMPAT | |
4804 | if (req->ctx->compat) | |
1400e697 | 4805 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4806 | #endif |
52de1fe1 | 4807 | |
1400e697 | 4808 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4809 | } |
4810 | ||
bcda7baa | 4811 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4812 | bool needs_lock) |
bcda7baa JA |
4813 | { |
4814 | struct io_sr_msg *sr = &req->sr_msg; | |
4815 | struct io_buffer *kbuf; | |
4816 | ||
bcda7baa JA |
4817 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4818 | if (IS_ERR(kbuf)) | |
4819 | return kbuf; | |
4820 | ||
4821 | sr->kbuf = kbuf; | |
4822 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4823 | return kbuf; |
fddaface JA |
4824 | } |
4825 | ||
7fbb1b54 PB |
4826 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4827 | { | |
4828 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4829 | } | |
4830 | ||
3529d8c2 JA |
4831 | static int io_recvmsg_prep(struct io_kiocb *req, |
4832 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4833 | { |
e8c2bc1f | 4834 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4835 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4836 | int ret; |
3529d8c2 | 4837 | |
d2b6f48b PB |
4838 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4839 | return -EINVAL; | |
4840 | ||
3529d8c2 | 4841 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4842 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4843 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4844 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4845 | |
d8768362 JA |
4846 | #ifdef CONFIG_COMPAT |
4847 | if (req->ctx->compat) | |
4848 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4849 | #endif | |
4850 | ||
e8c2bc1f | 4851 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4852 | return 0; |
e8c2bc1f | 4853 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4854 | if (!ret) |
4855 | req->flags |= REQ_F_NEED_CLEANUP; | |
4856 | return ret; | |
aa1fa28f JA |
4857 | } |
4858 | ||
229a7b63 JA |
4859 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4860 | struct io_comp_state *cs) | |
aa1fa28f | 4861 | { |
6b754c8b | 4862 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4863 | struct socket *sock; |
7fbb1b54 | 4864 | struct io_buffer *kbuf; |
7a7cacba | 4865 | unsigned flags; |
52de1fe1 | 4866 | int ret, cflags = 0; |
03b1230c | 4867 | |
dba4a925 | 4868 | sock = sock_from_file(req->file); |
7a7cacba | 4869 | if (unlikely(!sock)) |
dba4a925 | 4870 | return -ENOTSOCK; |
3529d8c2 | 4871 | |
e8c2bc1f JA |
4872 | if (req->async_data) { |
4873 | kmsg = req->async_data; | |
4874 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4875 | /* if iov is set, it's allocated already */ |
4876 | if (!kmsg->iov) | |
4877 | kmsg->iov = kmsg->fast_iov; | |
4878 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4879 | } else { | |
4880 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4881 | if (ret) | |
681fda8d | 4882 | return ret; |
7a7cacba PB |
4883 | kmsg = &iomsg; |
4884 | } | |
03b1230c | 4885 | |
bc02ef33 | 4886 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4887 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4888 | if (IS_ERR(kbuf)) |
52de1fe1 | 4889 | return PTR_ERR(kbuf); |
7a7cacba PB |
4890 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4891 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4892 | 1, req->sr_msg.len); | |
4893 | } | |
52de1fe1 | 4894 | |
7a7cacba PB |
4895 | flags = req->sr_msg.msg_flags; |
4896 | if (flags & MSG_DONTWAIT) | |
4897 | req->flags |= REQ_F_NOWAIT; | |
4898 | else if (force_nonblock) | |
4899 | flags |= MSG_DONTWAIT; | |
e47293fd | 4900 | |
7a7cacba PB |
4901 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4902 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4903 | if (force_nonblock && ret == -EAGAIN) |
4904 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4905 | if (ret == -ERESTARTSYS) |
4906 | ret = -EINTR; | |
03b1230c | 4907 | |
7fbb1b54 PB |
4908 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4909 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4910 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4911 | kfree(kmsg->iov); |
99bc4c38 | 4912 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4913 | if (ret < 0) |
4914 | req_set_fail_links(req); | |
229a7b63 | 4915 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4916 | return 0; |
0fa03c62 | 4917 | } |
5d17b4a4 | 4918 | |
229a7b63 JA |
4919 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4920 | struct io_comp_state *cs) | |
fddaface | 4921 | { |
6b754c8b | 4922 | struct io_buffer *kbuf; |
7a7cacba PB |
4923 | struct io_sr_msg *sr = &req->sr_msg; |
4924 | struct msghdr msg; | |
4925 | void __user *buf = sr->buf; | |
fddaface | 4926 | struct socket *sock; |
7a7cacba PB |
4927 | struct iovec iov; |
4928 | unsigned flags; | |
bcda7baa | 4929 | int ret, cflags = 0; |
fddaface | 4930 | |
dba4a925 | 4931 | sock = sock_from_file(req->file); |
7a7cacba | 4932 | if (unlikely(!sock)) |
dba4a925 | 4933 | return -ENOTSOCK; |
fddaface | 4934 | |
bc02ef33 | 4935 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4936 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4937 | if (IS_ERR(kbuf)) |
4938 | return PTR_ERR(kbuf); | |
7a7cacba | 4939 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4940 | } |
bcda7baa | 4941 | |
7a7cacba | 4942 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4943 | if (unlikely(ret)) |
4944 | goto out_free; | |
fddaface | 4945 | |
7a7cacba PB |
4946 | msg.msg_name = NULL; |
4947 | msg.msg_control = NULL; | |
4948 | msg.msg_controllen = 0; | |
4949 | msg.msg_namelen = 0; | |
4950 | msg.msg_iocb = NULL; | |
4951 | msg.msg_flags = 0; | |
fddaface | 4952 | |
7a7cacba PB |
4953 | flags = req->sr_msg.msg_flags; |
4954 | if (flags & MSG_DONTWAIT) | |
4955 | req->flags |= REQ_F_NOWAIT; | |
4956 | else if (force_nonblock) | |
4957 | flags |= MSG_DONTWAIT; | |
4958 | ||
4959 | ret = sock_recvmsg(sock, &msg, flags); | |
4960 | if (force_nonblock && ret == -EAGAIN) | |
4961 | return -EAGAIN; | |
4962 | if (ret == -ERESTARTSYS) | |
4963 | ret = -EINTR; | |
14c32eee | 4964 | out_free: |
7fbb1b54 PB |
4965 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4966 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4967 | if (ret < 0) |
4968 | req_set_fail_links(req); | |
229a7b63 | 4969 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4970 | return 0; |
fddaface JA |
4971 | } |
4972 | ||
3529d8c2 | 4973 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4974 | { |
8ed8d3c3 JA |
4975 | struct io_accept *accept = &req->accept; |
4976 | ||
14587a46 | 4977 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4978 | return -EINVAL; |
8042d6ce | 4979 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4980 | return -EINVAL; |
4981 | ||
d55e5f5b JA |
4982 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4983 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4984 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4985 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4986 | return 0; |
8ed8d3c3 | 4987 | } |
17f2fe35 | 4988 | |
229a7b63 JA |
4989 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4990 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4991 | { |
4992 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4993 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4994 | int ret; |
4995 | ||
e697deed JX |
4996 | if (req->file->f_flags & O_NONBLOCK) |
4997 | req->flags |= REQ_F_NOWAIT; | |
4998 | ||
8ed8d3c3 | 4999 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
5000 | accept->addr_len, accept->flags, |
5001 | accept->nofile); | |
8ed8d3c3 | 5002 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 5003 | return -EAGAIN; |
ac45abc0 PB |
5004 | if (ret < 0) { |
5005 | if (ret == -ERESTARTSYS) | |
5006 | ret = -EINTR; | |
4e88d6e7 | 5007 | req_set_fail_links(req); |
ac45abc0 | 5008 | } |
229a7b63 | 5009 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 5010 | return 0; |
8ed8d3c3 JA |
5011 | } |
5012 | ||
3529d8c2 | 5013 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5014 | { |
3529d8c2 | 5015 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 5016 | struct io_async_connect *io = req->async_data; |
f499a021 | 5017 | |
14587a46 | 5018 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
5019 | return -EINVAL; |
5020 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
5021 | return -EINVAL; | |
5022 | ||
3529d8c2 JA |
5023 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5024 | conn->addr_len = READ_ONCE(sqe->addr2); | |
5025 | ||
5026 | if (!io) | |
5027 | return 0; | |
5028 | ||
5029 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 5030 | &io->address); |
f499a021 JA |
5031 | } |
5032 | ||
229a7b63 JA |
5033 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5034 | struct io_comp_state *cs) | |
f8e85cf2 | 5035 | { |
e8c2bc1f | 5036 | struct io_async_connect __io, *io; |
f8e85cf2 | 5037 | unsigned file_flags; |
3fbb51c1 | 5038 | int ret; |
f8e85cf2 | 5039 | |
e8c2bc1f JA |
5040 | if (req->async_data) { |
5041 | io = req->async_data; | |
f499a021 | 5042 | } else { |
3529d8c2 JA |
5043 | ret = move_addr_to_kernel(req->connect.addr, |
5044 | req->connect.addr_len, | |
e8c2bc1f | 5045 | &__io.address); |
f499a021 JA |
5046 | if (ret) |
5047 | goto out; | |
5048 | io = &__io; | |
5049 | } | |
5050 | ||
3fbb51c1 JA |
5051 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5052 | ||
e8c2bc1f | 5053 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5054 | req->connect.addr_len, file_flags); |
87f80d62 | 5055 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5056 | if (req->async_data) |
b7bb4f7d | 5057 | return -EAGAIN; |
e8c2bc1f | 5058 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5059 | ret = -ENOMEM; |
5060 | goto out; | |
5061 | } | |
e8c2bc1f JA |
5062 | io = req->async_data; |
5063 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 5064 | return -EAGAIN; |
f499a021 | 5065 | } |
f8e85cf2 JA |
5066 | if (ret == -ERESTARTSYS) |
5067 | ret = -EINTR; | |
f499a021 | 5068 | out: |
4e88d6e7 JA |
5069 | if (ret < 0) |
5070 | req_set_fail_links(req); | |
229a7b63 | 5071 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 5072 | return 0; |
469956e8 Y |
5073 | } |
5074 | #else /* !CONFIG_NET */ | |
5075 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5076 | { | |
f8e85cf2 | 5077 | return -EOPNOTSUPP; |
f8e85cf2 JA |
5078 | } |
5079 | ||
1e16c2f9 RD |
5080 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
5081 | struct io_comp_state *cs) | |
469956e8 Y |
5082 | { |
5083 | return -EOPNOTSUPP; | |
5084 | } | |
5085 | ||
1e16c2f9 RD |
5086 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
5087 | struct io_comp_state *cs) | |
469956e8 Y |
5088 | { |
5089 | return -EOPNOTSUPP; | |
5090 | } | |
5091 | ||
5092 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5093 | const struct io_uring_sqe *sqe) | |
5094 | { | |
5095 | return -EOPNOTSUPP; | |
5096 | } | |
5097 | ||
1e16c2f9 RD |
5098 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
5099 | struct io_comp_state *cs) | |
469956e8 Y |
5100 | { |
5101 | return -EOPNOTSUPP; | |
5102 | } | |
5103 | ||
1e16c2f9 RD |
5104 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
5105 | struct io_comp_state *cs) | |
469956e8 Y |
5106 | { |
5107 | return -EOPNOTSUPP; | |
5108 | } | |
5109 | ||
5110 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5111 | { | |
5112 | return -EOPNOTSUPP; | |
5113 | } | |
5114 | ||
1e16c2f9 RD |
5115 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
5116 | struct io_comp_state *cs) | |
469956e8 Y |
5117 | { |
5118 | return -EOPNOTSUPP; | |
5119 | } | |
ce593a6c | 5120 | |
469956e8 Y |
5121 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5122 | { | |
5123 | return -EOPNOTSUPP; | |
5124 | } | |
5125 | ||
1e16c2f9 RD |
5126 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5127 | struct io_comp_state *cs) | |
469956e8 | 5128 | { |
f8e85cf2 | 5129 | return -EOPNOTSUPP; |
ce593a6c | 5130 | } |
469956e8 | 5131 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5132 | |
d7718a9d JA |
5133 | struct io_poll_table { |
5134 | struct poll_table_struct pt; | |
5135 | struct io_kiocb *req; | |
5136 | int error; | |
5137 | }; | |
ce593a6c | 5138 | |
d7718a9d JA |
5139 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5140 | __poll_t mask, task_work_func_t func) | |
5141 | { | |
aa96bf8a | 5142 | int ret; |
d7718a9d JA |
5143 | |
5144 | /* for instances that support it check for an event match first: */ | |
5145 | if (mask && !(mask & poll->events)) | |
5146 | return 0; | |
5147 | ||
5148 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5149 | ||
5150 | list_del_init(&poll->wait.entry); | |
5151 | ||
d7718a9d JA |
5152 | req->result = mask; |
5153 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5154 | percpu_ref_get(&req->ctx->refs); |
5155 | ||
d7718a9d | 5156 | /* |
e3aabf95 JA |
5157 | * If this fails, then the task is exiting. When a task exits, the |
5158 | * work gets canceled, so just cancel this request as well instead | |
5159 | * of executing it. We can't safely execute it anyway, as we may not | |
5160 | * have the needed state needed for it anyway. | |
d7718a9d | 5161 | */ |
355fb9e2 | 5162 | ret = io_req_task_work_add(req); |
aa96bf8a | 5163 | if (unlikely(ret)) { |
c2c4c83c JA |
5164 | struct task_struct *tsk; |
5165 | ||
e3aabf95 | 5166 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5167 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5168 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5169 | wake_up_process(tsk); |
aa96bf8a | 5170 | } |
d7718a9d JA |
5171 | return 1; |
5172 | } | |
5173 | ||
74ce6ce4 JA |
5174 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5175 | __acquires(&req->ctx->completion_lock) | |
5176 | { | |
5177 | struct io_ring_ctx *ctx = req->ctx; | |
5178 | ||
5179 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5180 | struct poll_table_struct pt = { ._key = poll->events }; | |
5181 | ||
5182 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5183 | } | |
5184 | ||
5185 | spin_lock_irq(&ctx->completion_lock); | |
5186 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5187 | add_wait_queue(poll->head, &poll->wait); | |
5188 | return true; | |
5189 | } | |
5190 | ||
5191 | return false; | |
5192 | } | |
5193 | ||
d4e7cd36 | 5194 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5195 | { |
e8c2bc1f | 5196 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5197 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5198 | return req->async_data; |
d4e7cd36 JA |
5199 | return req->apoll->double_poll; |
5200 | } | |
5201 | ||
5202 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5203 | { | |
5204 | if (req->opcode == IORING_OP_POLL_ADD) | |
5205 | return &req->poll; | |
5206 | return &req->apoll->poll; | |
5207 | } | |
5208 | ||
5209 | static void io_poll_remove_double(struct io_kiocb *req) | |
5210 | { | |
5211 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5212 | |
5213 | lockdep_assert_held(&req->ctx->completion_lock); | |
5214 | ||
5215 | if (poll && poll->head) { | |
5216 | struct wait_queue_head *head = poll->head; | |
5217 | ||
5218 | spin_lock(&head->lock); | |
5219 | list_del_init(&poll->wait.entry); | |
5220 | if (poll->wait.private) | |
5221 | refcount_dec(&req->refs); | |
5222 | poll->head = NULL; | |
5223 | spin_unlock(&head->lock); | |
5224 | } | |
5225 | } | |
5226 | ||
5227 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5228 | { | |
5229 | struct io_ring_ctx *ctx = req->ctx; | |
5230 | ||
d4e7cd36 | 5231 | io_poll_remove_double(req); |
18bceab1 JA |
5232 | req->poll.done = true; |
5233 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5234 | io_commit_cqring(ctx); | |
5235 | } | |
5236 | ||
dd221f46 | 5237 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5238 | { |
dd221f46 | 5239 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5240 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5241 | struct io_kiocb *nxt; |
18bceab1 JA |
5242 | |
5243 | if (io_poll_rewait(req, &req->poll)) { | |
5244 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5245 | } else { |
5246 | hash_del(&req->hash_node); | |
5247 | io_poll_complete(req, req->result, 0); | |
5248 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5249 | |
dd221f46 PB |
5250 | nxt = io_put_req_find_next(req); |
5251 | io_cqring_ev_posted(ctx); | |
5252 | if (nxt) | |
5253 | __io_req_task_submit(nxt); | |
5254 | } | |
18bceab1 | 5255 | |
6d816e08 | 5256 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5257 | } |
5258 | ||
5259 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5260 | int sync, void *key) | |
5261 | { | |
5262 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5263 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5264 | __poll_t mask = key_to_poll(key); |
5265 | ||
5266 | /* for instances that support it check for an event match first: */ | |
5267 | if (mask && !(mask & poll->events)) | |
5268 | return 0; | |
5269 | ||
8706e04e JA |
5270 | list_del_init(&wait->entry); |
5271 | ||
807abcb0 | 5272 | if (poll && poll->head) { |
18bceab1 JA |
5273 | bool done; |
5274 | ||
807abcb0 JA |
5275 | spin_lock(&poll->head->lock); |
5276 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5277 | if (!done) |
807abcb0 | 5278 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5279 | /* make sure double remove sees this as being gone */ |
5280 | wait->private = NULL; | |
807abcb0 | 5281 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5282 | if (!done) { |
5283 | /* use wait func handler, so it matches the rq type */ | |
5284 | poll->wait.func(&poll->wait, mode, sync, key); | |
5285 | } | |
18bceab1 JA |
5286 | } |
5287 | refcount_dec(&req->refs); | |
5288 | return 1; | |
5289 | } | |
5290 | ||
5291 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5292 | wait_queue_func_t wake_func) | |
5293 | { | |
5294 | poll->head = NULL; | |
5295 | poll->done = false; | |
5296 | poll->canceled = false; | |
5297 | poll->events = events; | |
5298 | INIT_LIST_HEAD(&poll->wait.entry); | |
5299 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5300 | } | |
5301 | ||
5302 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5303 | struct wait_queue_head *head, |
5304 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5305 | { |
5306 | struct io_kiocb *req = pt->req; | |
5307 | ||
5308 | /* | |
5309 | * If poll->head is already set, it's because the file being polled | |
5310 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5311 | * for write). Setup a separate io_poll_iocb if this happens. | |
5312 | */ | |
5313 | if (unlikely(poll->head)) { | |
58852d4d PB |
5314 | struct io_poll_iocb *poll_one = poll; |
5315 | ||
18bceab1 | 5316 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5317 | if (*poll_ptr) { |
18bceab1 JA |
5318 | pt->error = -EINVAL; |
5319 | return; | |
5320 | } | |
5321 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5322 | if (!poll) { | |
5323 | pt->error = -ENOMEM; | |
5324 | return; | |
5325 | } | |
58852d4d | 5326 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5327 | refcount_inc(&req->refs); |
5328 | poll->wait.private = req; | |
807abcb0 | 5329 | *poll_ptr = poll; |
18bceab1 JA |
5330 | } |
5331 | ||
5332 | pt->error = 0; | |
5333 | poll->head = head; | |
a31eb4a2 JX |
5334 | |
5335 | if (poll->events & EPOLLEXCLUSIVE) | |
5336 | add_wait_queue_exclusive(head, &poll->wait); | |
5337 | else | |
5338 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5339 | } |
5340 | ||
5341 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5342 | struct poll_table_struct *p) | |
5343 | { | |
5344 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5345 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5346 | |
807abcb0 | 5347 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5348 | } |
5349 | ||
d7718a9d JA |
5350 | static void io_async_task_func(struct callback_head *cb) |
5351 | { | |
5352 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5353 | struct async_poll *apoll = req->apoll; | |
5354 | struct io_ring_ctx *ctx = req->ctx; | |
5355 | ||
5356 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5357 | ||
74ce6ce4 | 5358 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5359 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5360 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5361 | return; |
d7718a9d JA |
5362 | } |
5363 | ||
31067255 | 5364 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5365 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5366 | hash_del(&req->hash_node); |
2bae047e | 5367 | |
d4e7cd36 | 5368 | io_poll_remove_double(req); |
74ce6ce4 JA |
5369 | spin_unlock_irq(&ctx->completion_lock); |
5370 | ||
0be0b0e3 PB |
5371 | if (!READ_ONCE(apoll->poll.canceled)) |
5372 | __io_req_task_submit(req); | |
5373 | else | |
5374 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5375 | |
6d816e08 | 5376 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5377 | kfree(apoll->double_poll); |
31067255 | 5378 | kfree(apoll); |
d7718a9d JA |
5379 | } |
5380 | ||
5381 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5382 | void *key) | |
5383 | { | |
5384 | struct io_kiocb *req = wait->private; | |
5385 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5386 | ||
5387 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5388 | key_to_poll(key)); | |
5389 | ||
5390 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5391 | } | |
5392 | ||
5393 | static void io_poll_req_insert(struct io_kiocb *req) | |
5394 | { | |
5395 | struct io_ring_ctx *ctx = req->ctx; | |
5396 | struct hlist_head *list; | |
5397 | ||
5398 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5399 | hlist_add_head(&req->hash_node, list); | |
5400 | } | |
5401 | ||
5402 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5403 | struct io_poll_iocb *poll, | |
5404 | struct io_poll_table *ipt, __poll_t mask, | |
5405 | wait_queue_func_t wake_func) | |
5406 | __acquires(&ctx->completion_lock) | |
5407 | { | |
5408 | struct io_ring_ctx *ctx = req->ctx; | |
5409 | bool cancel = false; | |
5410 | ||
4d52f338 | 5411 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5412 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5413 | poll->file = req->file; |
18bceab1 | 5414 | poll->wait.private = req; |
d7718a9d JA |
5415 | |
5416 | ipt->pt._key = mask; | |
5417 | ipt->req = req; | |
5418 | ipt->error = -EINVAL; | |
5419 | ||
d7718a9d JA |
5420 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5421 | ||
5422 | spin_lock_irq(&ctx->completion_lock); | |
5423 | if (likely(poll->head)) { | |
5424 | spin_lock(&poll->head->lock); | |
5425 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5426 | if (ipt->error) | |
5427 | cancel = true; | |
5428 | ipt->error = 0; | |
5429 | mask = 0; | |
5430 | } | |
5431 | if (mask || ipt->error) | |
5432 | list_del_init(&poll->wait.entry); | |
5433 | else if (cancel) | |
5434 | WRITE_ONCE(poll->canceled, true); | |
5435 | else if (!poll->done) /* actually waiting for an event */ | |
5436 | io_poll_req_insert(req); | |
5437 | spin_unlock(&poll->head->lock); | |
5438 | } | |
5439 | ||
5440 | return mask; | |
5441 | } | |
5442 | ||
5443 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5444 | { | |
5445 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5446 | struct io_ring_ctx *ctx = req->ctx; | |
5447 | struct async_poll *apoll; | |
5448 | struct io_poll_table ipt; | |
5449 | __poll_t mask, ret; | |
9dab14b8 | 5450 | int rw; |
d7718a9d JA |
5451 | |
5452 | if (!req->file || !file_can_poll(req->file)) | |
5453 | return false; | |
24c74678 | 5454 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5455 | return false; |
9dab14b8 JA |
5456 | if (def->pollin) |
5457 | rw = READ; | |
5458 | else if (def->pollout) | |
5459 | rw = WRITE; | |
5460 | else | |
5461 | return false; | |
5462 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5463 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5464 | return false; |
5465 | ||
5466 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5467 | if (unlikely(!apoll)) | |
5468 | return false; | |
807abcb0 | 5469 | apoll->double_poll = NULL; |
d7718a9d JA |
5470 | |
5471 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5472 | req->apoll = apoll; |
d7718a9d | 5473 | |
8755d97a | 5474 | mask = 0; |
d7718a9d | 5475 | if (def->pollin) |
8755d97a | 5476 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5477 | if (def->pollout) |
5478 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5479 | |
5480 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5481 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5482 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5483 | mask &= ~POLLIN; | |
5484 | ||
d7718a9d JA |
5485 | mask |= POLLERR | POLLPRI; |
5486 | ||
5487 | ipt.pt._qproc = io_async_queue_proc; | |
5488 | ||
5489 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5490 | io_async_wake); | |
a36da65c | 5491 | if (ret || ipt.error) { |
d4e7cd36 | 5492 | io_poll_remove_double(req); |
d7718a9d | 5493 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5494 | kfree(apoll->double_poll); |
d7718a9d JA |
5495 | kfree(apoll); |
5496 | return false; | |
5497 | } | |
5498 | spin_unlock_irq(&ctx->completion_lock); | |
5499 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5500 | apoll->poll.events); | |
5501 | return true; | |
5502 | } | |
5503 | ||
5504 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5505 | struct io_poll_iocb *poll) | |
221c5eb2 | 5506 | { |
b41e9852 | 5507 | bool do_complete = false; |
221c5eb2 JA |
5508 | |
5509 | spin_lock(&poll->head->lock); | |
5510 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5511 | if (!list_empty(&poll->wait.entry)) { |
5512 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5513 | do_complete = true; |
221c5eb2 JA |
5514 | } |
5515 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5516 | hash_del(&req->hash_node); |
d7718a9d JA |
5517 | return do_complete; |
5518 | } | |
5519 | ||
5520 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5521 | { | |
5522 | bool do_complete; | |
5523 | ||
d4e7cd36 JA |
5524 | io_poll_remove_double(req); |
5525 | ||
d7718a9d JA |
5526 | if (req->opcode == IORING_OP_POLL_ADD) { |
5527 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5528 | } else { | |
3bfa5bcb JA |
5529 | struct async_poll *apoll = req->apoll; |
5530 | ||
d7718a9d | 5531 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5532 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5533 | if (do_complete) { | |
d7718a9d | 5534 | io_put_req(req); |
807abcb0 | 5535 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5536 | kfree(apoll); |
5537 | } | |
b1f573bd XW |
5538 | } |
5539 | ||
b41e9852 JA |
5540 | if (do_complete) { |
5541 | io_cqring_fill_event(req, -ECANCELED); | |
5542 | io_commit_cqring(req->ctx); | |
f254ac04 | 5543 | req_set_fail_links(req); |
216578e5 | 5544 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5545 | } |
5546 | ||
5547 | return do_complete; | |
221c5eb2 JA |
5548 | } |
5549 | ||
76e1b642 JA |
5550 | /* |
5551 | * Returns true if we found and killed one or more poll requests | |
5552 | */ | |
6b81928d PB |
5553 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5554 | struct files_struct *files) | |
221c5eb2 | 5555 | { |
78076bb6 | 5556 | struct hlist_node *tmp; |
221c5eb2 | 5557 | struct io_kiocb *req; |
8e2e1faf | 5558 | int posted = 0, i; |
221c5eb2 JA |
5559 | |
5560 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5561 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5562 | struct hlist_head *list; | |
5563 | ||
5564 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5565 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5566 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5567 | posted += io_poll_remove_one(req); |
5568 | } | |
221c5eb2 JA |
5569 | } |
5570 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5571 | |
8e2e1faf JA |
5572 | if (posted) |
5573 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5574 | |
5575 | return posted != 0; | |
221c5eb2 JA |
5576 | } |
5577 | ||
47f46768 JA |
5578 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5579 | { | |
78076bb6 | 5580 | struct hlist_head *list; |
47f46768 JA |
5581 | struct io_kiocb *req; |
5582 | ||
78076bb6 JA |
5583 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5584 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5585 | if (sqe_addr != req->user_data) |
5586 | continue; | |
5587 | if (io_poll_remove_one(req)) | |
eac406c6 | 5588 | return 0; |
b41e9852 | 5589 | return -EALREADY; |
47f46768 JA |
5590 | } |
5591 | ||
5592 | return -ENOENT; | |
5593 | } | |
5594 | ||
3529d8c2 JA |
5595 | static int io_poll_remove_prep(struct io_kiocb *req, |
5596 | const struct io_uring_sqe *sqe) | |
0969e783 | 5597 | { |
0969e783 JA |
5598 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5599 | return -EINVAL; | |
5600 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5601 | sqe->poll_events) | |
5602 | return -EINVAL; | |
5603 | ||
018043be | 5604 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5605 | return 0; |
5606 | } | |
5607 | ||
221c5eb2 JA |
5608 | /* |
5609 | * Find a running poll command that matches one specified in sqe->addr, | |
5610 | * and remove it if found. | |
5611 | */ | |
fc4df999 | 5612 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5613 | { |
5614 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5615 | int ret; |
221c5eb2 | 5616 | |
221c5eb2 | 5617 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5618 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5619 | spin_unlock_irq(&ctx->completion_lock); |
5620 | ||
4e88d6e7 JA |
5621 | if (ret < 0) |
5622 | req_set_fail_links(req); | |
e1e16097 | 5623 | io_req_complete(req, ret); |
221c5eb2 JA |
5624 | return 0; |
5625 | } | |
5626 | ||
221c5eb2 JA |
5627 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5628 | void *key) | |
5629 | { | |
c2f2eb7d JA |
5630 | struct io_kiocb *req = wait->private; |
5631 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5632 | |
d7718a9d | 5633 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5634 | } |
5635 | ||
221c5eb2 JA |
5636 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5637 | struct poll_table_struct *p) | |
5638 | { | |
5639 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5640 | ||
e8c2bc1f | 5641 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5642 | } |
5643 | ||
3529d8c2 | 5644 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5645 | { |
5646 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5647 | u32 events; |
221c5eb2 JA |
5648 | |
5649 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5650 | return -EINVAL; | |
5651 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5652 | return -EINVAL; | |
5653 | ||
5769a351 JX |
5654 | events = READ_ONCE(sqe->poll32_events); |
5655 | #ifdef __BIG_ENDIAN | |
5656 | events = swahw32(events); | |
5657 | #endif | |
a31eb4a2 JX |
5658 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5659 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5660 | return 0; |
5661 | } | |
5662 | ||
014db007 | 5663 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5664 | { |
5665 | struct io_poll_iocb *poll = &req->poll; | |
5666 | struct io_ring_ctx *ctx = req->ctx; | |
5667 | struct io_poll_table ipt; | |
0969e783 | 5668 | __poll_t mask; |
0969e783 | 5669 | |
d7718a9d | 5670 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5671 | |
d7718a9d JA |
5672 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5673 | io_poll_wake); | |
221c5eb2 | 5674 | |
8c838788 | 5675 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5676 | ipt.error = 0; |
b0dd8a41 | 5677 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5678 | } |
221c5eb2 JA |
5679 | spin_unlock_irq(&ctx->completion_lock); |
5680 | ||
8c838788 JA |
5681 | if (mask) { |
5682 | io_cqring_ev_posted(ctx); | |
014db007 | 5683 | io_put_req(req); |
221c5eb2 | 5684 | } |
8c838788 | 5685 | return ipt.error; |
221c5eb2 JA |
5686 | } |
5687 | ||
5262f567 JA |
5688 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5689 | { | |
ad8a48ac JA |
5690 | struct io_timeout_data *data = container_of(timer, |
5691 | struct io_timeout_data, timer); | |
5692 | struct io_kiocb *req = data->req; | |
5693 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5694 | unsigned long flags; |
5695 | ||
5262f567 | 5696 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5697 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5698 | atomic_set(&req->ctx->cq_timeouts, |
5699 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5700 | ||
78e19bbe | 5701 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5702 | io_commit_cqring(ctx); |
5703 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5704 | ||
5705 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5706 | req_set_fail_links(req); |
5262f567 JA |
5707 | io_put_req(req); |
5708 | return HRTIMER_NORESTART; | |
5709 | } | |
5710 | ||
fbd15848 PB |
5711 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5712 | __u64 user_data) | |
f254ac04 | 5713 | { |
fbd15848 | 5714 | struct io_timeout_data *io; |
47f46768 JA |
5715 | struct io_kiocb *req; |
5716 | int ret = -ENOENT; | |
f254ac04 | 5717 | |
135fcde8 | 5718 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5719 | if (user_data == req->user_data) { |
47f46768 JA |
5720 | ret = 0; |
5721 | break; | |
5722 | } | |
5723 | } | |
5724 | ||
5725 | if (ret == -ENOENT) | |
fbd15848 PB |
5726 | return ERR_PTR(ret); |
5727 | ||
5728 | io = req->async_data; | |
e8c2bc1f | 5729 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 | 5730 | if (ret == -1) |
fbd15848 | 5731 | return ERR_PTR(-EALREADY); |
a71976f3 | 5732 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5733 | return req; |
5734 | } | |
47f46768 | 5735 | |
fbd15848 PB |
5736 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5737 | { | |
5738 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5739 | ||
5740 | if (IS_ERR(req)) | |
5741 | return PTR_ERR(req); | |
f254ac04 JA |
5742 | |
5743 | req_set_fail_links(req); | |
f254ac04 | 5744 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5745 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5746 | return 0; |
5747 | } | |
5748 | ||
9c8e11b3 PB |
5749 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5750 | struct timespec64 *ts, enum hrtimer_mode mode) | |
47f46768 | 5751 | { |
9c8e11b3 PB |
5752 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5753 | struct io_timeout_data *data; | |
47f46768 | 5754 | |
9c8e11b3 PB |
5755 | if (IS_ERR(req)) |
5756 | return PTR_ERR(req); | |
47f46768 | 5757 | |
9c8e11b3 PB |
5758 | req->timeout.off = 0; /* noseq */ |
5759 | data = req->async_data; | |
5760 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5761 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5762 | data->timer.function = io_timeout_fn; | |
5763 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5764 | return 0; | |
47f46768 JA |
5765 | } |
5766 | ||
3529d8c2 JA |
5767 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5768 | const struct io_uring_sqe *sqe) | |
b29472ee | 5769 | { |
9c8e11b3 PB |
5770 | struct io_timeout_rem *tr = &req->timeout_rem; |
5771 | ||
b29472ee JA |
5772 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5773 | return -EINVAL; | |
61710e43 DA |
5774 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5775 | return -EINVAL; | |
9c8e11b3 | 5776 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5777 | return -EINVAL; |
5778 | ||
9c8e11b3 PB |
5779 | tr->addr = READ_ONCE(sqe->addr); |
5780 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5781 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5782 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5783 | return -EINVAL; | |
5784 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5785 | return -EFAULT; | |
5786 | } else if (tr->flags) { | |
5787 | /* timeout removal doesn't support flags */ | |
b29472ee | 5788 | return -EINVAL; |
9c8e11b3 | 5789 | } |
b29472ee | 5790 | |
b29472ee JA |
5791 | return 0; |
5792 | } | |
5793 | ||
11365043 JA |
5794 | /* |
5795 | * Remove or update an existing timeout command | |
5796 | */ | |
fc4df999 | 5797 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 | 5798 | { |
9c8e11b3 | 5799 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5800 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5801 | int ret; |
11365043 | 5802 | |
11365043 | 5803 | spin_lock_irq(&ctx->completion_lock); |
9c8e11b3 PB |
5804 | if (req->timeout_rem.flags & IORING_TIMEOUT_UPDATE) { |
5805 | enum hrtimer_mode mode = (tr->flags & IORING_TIMEOUT_ABS) | |
5806 | ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; | |
5807 | ||
5808 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
5809 | } else { | |
5810 | ret = io_timeout_cancel(ctx, tr->addr); | |
5811 | } | |
11365043 | 5812 | |
47f46768 | 5813 | io_cqring_fill_event(req, ret); |
11365043 JA |
5814 | io_commit_cqring(ctx); |
5815 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5816 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5817 | if (ret < 0) |
5818 | req_set_fail_links(req); | |
ec9c02ad | 5819 | io_put_req(req); |
11365043 | 5820 | return 0; |
5262f567 JA |
5821 | } |
5822 | ||
3529d8c2 | 5823 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5824 | bool is_timeout_link) |
5262f567 | 5825 | { |
ad8a48ac | 5826 | struct io_timeout_data *data; |
a41525ab | 5827 | unsigned flags; |
56080b02 | 5828 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5829 | |
ad8a48ac | 5830 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5831 | return -EINVAL; |
ad8a48ac | 5832 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5833 | return -EINVAL; |
56080b02 | 5834 | if (off && is_timeout_link) |
2d28390a | 5835 | return -EINVAL; |
a41525ab JA |
5836 | flags = READ_ONCE(sqe->timeout_flags); |
5837 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5838 | return -EINVAL; |
bdf20073 | 5839 | |
bfe68a22 | 5840 | req->timeout.off = off; |
26a61679 | 5841 | |
e8c2bc1f | 5842 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5843 | return -ENOMEM; |
5844 | ||
e8c2bc1f | 5845 | data = req->async_data; |
ad8a48ac | 5846 | data->req = req; |
ad8a48ac JA |
5847 | |
5848 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5849 | return -EFAULT; |
5850 | ||
11365043 | 5851 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5852 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5853 | else |
ad8a48ac | 5854 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5855 | |
ad8a48ac JA |
5856 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5857 | return 0; | |
5858 | } | |
5859 | ||
fc4df999 | 5860 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5861 | { |
ad8a48ac | 5862 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5863 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5864 | struct list_head *entry; |
bfe68a22 | 5865 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5866 | |
733f5c95 | 5867 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5868 | |
5262f567 JA |
5869 | /* |
5870 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5871 | * timeout event to be satisfied. If it isn't set, then this is |
5872 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5873 | */ |
8eb7e2d0 | 5874 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5875 | entry = ctx->timeout_list.prev; |
5876 | goto add; | |
5877 | } | |
5262f567 | 5878 | |
bfe68a22 PB |
5879 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5880 | req->timeout.target_seq = tail + off; | |
5262f567 | 5881 | |
f010505b MDG |
5882 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5883 | * This is safe because ->completion_lock is held, and submissions | |
5884 | * and completions are never mixed in the same ->completion_lock section. | |
5885 | */ | |
5886 | ctx->cq_last_tm_flush = tail; | |
5887 | ||
5262f567 JA |
5888 | /* |
5889 | * Insertion sort, ensuring the first entry in the list is always | |
5890 | * the one we need first. | |
5891 | */ | |
5262f567 | 5892 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5893 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5894 | timeout.list); | |
5262f567 | 5895 | |
8eb7e2d0 | 5896 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5897 | continue; |
bfe68a22 PB |
5898 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5899 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5900 | break; |
5901 | } | |
93bd25bb | 5902 | add: |
135fcde8 | 5903 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5904 | data->timer.function = io_timeout_fn; |
5905 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5906 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5907 | return 0; |
5908 | } | |
5262f567 | 5909 | |
62755e35 JA |
5910 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5911 | { | |
5912 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5913 | ||
5914 | return req->user_data == (unsigned long) data; | |
5915 | } | |
5916 | ||
e977d6d3 | 5917 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5918 | { |
62755e35 | 5919 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5920 | int ret = 0; |
5921 | ||
4f26bda1 | 5922 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5923 | switch (cancel_ret) { |
5924 | case IO_WQ_CANCEL_OK: | |
5925 | ret = 0; | |
5926 | break; | |
5927 | case IO_WQ_CANCEL_RUNNING: | |
5928 | ret = -EALREADY; | |
5929 | break; | |
5930 | case IO_WQ_CANCEL_NOTFOUND: | |
5931 | ret = -ENOENT; | |
5932 | break; | |
5933 | } | |
5934 | ||
e977d6d3 JA |
5935 | return ret; |
5936 | } | |
5937 | ||
47f46768 JA |
5938 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5939 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5940 | int success_ret) |
47f46768 JA |
5941 | { |
5942 | unsigned long flags; | |
5943 | int ret; | |
5944 | ||
5945 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5946 | if (ret != -ENOENT) { | |
5947 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5948 | goto done; | |
5949 | } | |
5950 | ||
5951 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5952 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5953 | if (ret != -ENOENT) | |
5954 | goto done; | |
5955 | ret = io_poll_cancel(ctx, sqe_addr); | |
5956 | done: | |
b0dd8a41 JA |
5957 | if (!ret) |
5958 | ret = success_ret; | |
47f46768 JA |
5959 | io_cqring_fill_event(req, ret); |
5960 | io_commit_cqring(ctx); | |
5961 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5962 | io_cqring_ev_posted(ctx); | |
5963 | ||
4e88d6e7 JA |
5964 | if (ret < 0) |
5965 | req_set_fail_links(req); | |
014db007 | 5966 | io_put_req(req); |
47f46768 JA |
5967 | } |
5968 | ||
3529d8c2 JA |
5969 | static int io_async_cancel_prep(struct io_kiocb *req, |
5970 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5971 | { |
fbf23849 | 5972 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5973 | return -EINVAL; |
61710e43 DA |
5974 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5975 | return -EINVAL; | |
5976 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5977 | return -EINVAL; |
5978 | ||
fbf23849 JA |
5979 | req->cancel.addr = READ_ONCE(sqe->addr); |
5980 | return 0; | |
5981 | } | |
5982 | ||
014db007 | 5983 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5984 | { |
5985 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5986 | |
014db007 | 5987 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5988 | return 0; |
5989 | } | |
5990 | ||
05f3fb3c JA |
5991 | static int io_files_update_prep(struct io_kiocb *req, |
5992 | const struct io_uring_sqe *sqe) | |
5993 | { | |
6ca56f84 JA |
5994 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5995 | return -EINVAL; | |
61710e43 DA |
5996 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5997 | return -EINVAL; | |
5998 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5999 | return -EINVAL; |
6000 | ||
6001 | req->files_update.offset = READ_ONCE(sqe->off); | |
6002 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
6003 | if (!req->files_update.nr_args) | |
6004 | return -EINVAL; | |
6005 | req->files_update.arg = READ_ONCE(sqe->addr); | |
6006 | return 0; | |
6007 | } | |
6008 | ||
229a7b63 JA |
6009 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
6010 | struct io_comp_state *cs) | |
fbf23849 JA |
6011 | { |
6012 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
6013 | struct io_uring_files_update up; |
6014 | int ret; | |
fbf23849 | 6015 | |
f86cd20c | 6016 | if (force_nonblock) |
05f3fb3c | 6017 | return -EAGAIN; |
05f3fb3c JA |
6018 | |
6019 | up.offset = req->files_update.offset; | |
6020 | up.fds = req->files_update.arg; | |
6021 | ||
6022 | mutex_lock(&ctx->uring_lock); | |
6023 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
6024 | mutex_unlock(&ctx->uring_lock); | |
6025 | ||
6026 | if (ret < 0) | |
6027 | req_set_fail_links(req); | |
229a7b63 | 6028 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
6029 | return 0; |
6030 | } | |
6031 | ||
bfe76559 | 6032 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6033 | { |
d625c6ee | 6034 | switch (req->opcode) { |
e781573e | 6035 | case IORING_OP_NOP: |
bfe76559 | 6036 | return 0; |
f67676d1 JA |
6037 | case IORING_OP_READV: |
6038 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6039 | case IORING_OP_READ: |
bfe76559 | 6040 | return io_read_prep(req, sqe); |
f67676d1 JA |
6041 | case IORING_OP_WRITEV: |
6042 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6043 | case IORING_OP_WRITE: |
bfe76559 | 6044 | return io_write_prep(req, sqe); |
0969e783 | 6045 | case IORING_OP_POLL_ADD: |
bfe76559 | 6046 | return io_poll_add_prep(req, sqe); |
0969e783 | 6047 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 6048 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 6049 | case IORING_OP_FSYNC: |
bfe76559 | 6050 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 6051 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 6052 | return io_prep_sfr(req, sqe); |
03b1230c | 6053 | case IORING_OP_SENDMSG: |
fddaface | 6054 | case IORING_OP_SEND: |
bfe76559 | 6055 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6056 | case IORING_OP_RECVMSG: |
fddaface | 6057 | case IORING_OP_RECV: |
bfe76559 | 6058 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6059 | case IORING_OP_CONNECT: |
bfe76559 | 6060 | return io_connect_prep(req, sqe); |
2d28390a | 6061 | case IORING_OP_TIMEOUT: |
bfe76559 | 6062 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6063 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6064 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6065 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6066 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6067 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6068 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6069 | case IORING_OP_ACCEPT: |
bfe76559 | 6070 | return io_accept_prep(req, sqe); |
d63d1b5e | 6071 | case IORING_OP_FALLOCATE: |
bfe76559 | 6072 | return io_fallocate_prep(req, sqe); |
15b71abe | 6073 | case IORING_OP_OPENAT: |
bfe76559 | 6074 | return io_openat_prep(req, sqe); |
b5dba59e | 6075 | case IORING_OP_CLOSE: |
bfe76559 | 6076 | return io_close_prep(req, sqe); |
05f3fb3c | 6077 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 6078 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 6079 | case IORING_OP_STATX: |
bfe76559 | 6080 | return io_statx_prep(req, sqe); |
4840e418 | 6081 | case IORING_OP_FADVISE: |
bfe76559 | 6082 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6083 | case IORING_OP_MADVISE: |
bfe76559 | 6084 | return io_madvise_prep(req, sqe); |
cebdb986 | 6085 | case IORING_OP_OPENAT2: |
bfe76559 | 6086 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6087 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6088 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6089 | case IORING_OP_SPLICE: |
bfe76559 | 6090 | return io_splice_prep(req, sqe); |
ddf0322d | 6091 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6092 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6093 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6094 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6095 | case IORING_OP_TEE: |
bfe76559 | 6096 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6097 | case IORING_OP_SHUTDOWN: |
6098 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6099 | case IORING_OP_RENAMEAT: |
6100 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6101 | case IORING_OP_UNLINKAT: |
6102 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
6103 | } |
6104 | ||
bfe76559 PB |
6105 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6106 | req->opcode); | |
6107 | return-EINVAL; | |
6108 | } | |
6109 | ||
6110 | static int io_req_defer_prep(struct io_kiocb *req, | |
6111 | const struct io_uring_sqe *sqe) | |
6112 | { | |
bfe76559 PB |
6113 | if (!sqe) |
6114 | return 0; | |
6115 | if (io_alloc_async_data(req)) | |
6116 | return -EAGAIN; | |
bfe76559 | 6117 | return io_req_prep(req, sqe); |
f67676d1 JA |
6118 | } |
6119 | ||
9cf7c104 PB |
6120 | static u32 io_get_sequence(struct io_kiocb *req) |
6121 | { | |
6122 | struct io_kiocb *pos; | |
6123 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 6124 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 6125 | |
f2f87370 PB |
6126 | io_for_each_link(pos, req) |
6127 | nr_reqs++; | |
9cf7c104 PB |
6128 | |
6129 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
6130 | return total_submitted - nr_reqs; | |
6131 | } | |
6132 | ||
3529d8c2 | 6133 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6134 | { |
a197f664 | 6135 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6136 | struct io_defer_entry *de; |
f67676d1 | 6137 | int ret; |
9cf7c104 | 6138 | u32 seq; |
de0617e4 | 6139 | |
9d858b21 | 6140 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6141 | if (likely(list_empty_careful(&ctx->defer_list) && |
6142 | !(req->flags & REQ_F_IO_DRAIN))) | |
6143 | return 0; | |
6144 | ||
6145 | seq = io_get_sequence(req); | |
6146 | /* Still a chance to pass the sequence check */ | |
6147 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6148 | return 0; |
6149 | ||
e8c2bc1f | 6150 | if (!req->async_data) { |
650b5481 | 6151 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6152 | if (ret) |
650b5481 PB |
6153 | return ret; |
6154 | } | |
cbdcb435 | 6155 | io_prep_async_link(req); |
27dc8338 PB |
6156 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6157 | if (!de) | |
6158 | return -ENOMEM; | |
2d28390a | 6159 | |
de0617e4 | 6160 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6161 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6162 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6163 | kfree(de); |
ae34817b PB |
6164 | io_queue_async_work(req); |
6165 | return -EIOCBQUEUED; | |
de0617e4 JA |
6166 | } |
6167 | ||
915967f6 | 6168 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6169 | de->req = req; |
9cf7c104 | 6170 | de->seq = seq; |
27dc8338 | 6171 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6172 | spin_unlock_irq(&ctx->completion_lock); |
6173 | return -EIOCBQUEUED; | |
6174 | } | |
6175 | ||
f573d384 | 6176 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6177 | { |
f573d384 | 6178 | struct io_ring_ctx *ctx = req->ctx; |
c98de08c | 6179 | struct io_uring_task *tctx = req->task->io_uring; |
f573d384 JA |
6180 | unsigned long flags; |
6181 | ||
02a13674 JA |
6182 | if (req->work.flags & IO_WQ_WORK_FILES) { |
6183 | put_files_struct(req->work.identity->files); | |
6184 | put_nsproxy(req->work.identity->nsproxy); | |
6185 | } | |
f573d384 JA |
6186 | spin_lock_irqsave(&ctx->inflight_lock, flags); |
6187 | list_del(&req->inflight_entry); | |
f573d384 JA |
6188 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); |
6189 | req->flags &= ~REQ_F_INFLIGHT; | |
dfead8a8 | 6190 | req->work.flags &= ~IO_WQ_WORK_FILES; |
dfea9fce PB |
6191 | if (atomic_read(&tctx->in_idle)) |
6192 | wake_up(&tctx->wait); | |
f573d384 | 6193 | } |
99bc4c38 | 6194 | |
3ca405eb | 6195 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6196 | { |
0e1b6fe3 PB |
6197 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6198 | switch (req->opcode) { | |
6199 | case IORING_OP_READV: | |
6200 | case IORING_OP_READ_FIXED: | |
6201 | case IORING_OP_READ: | |
bcda7baa | 6202 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6203 | break; |
6204 | case IORING_OP_RECVMSG: | |
6205 | case IORING_OP_RECV: | |
bcda7baa | 6206 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6207 | break; |
6208 | } | |
6209 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6210 | } |
6211 | ||
0e1b6fe3 PB |
6212 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6213 | switch (req->opcode) { | |
6214 | case IORING_OP_READV: | |
6215 | case IORING_OP_READ_FIXED: | |
6216 | case IORING_OP_READ: | |
6217 | case IORING_OP_WRITEV: | |
6218 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6219 | case IORING_OP_WRITE: { |
6220 | struct io_async_rw *io = req->async_data; | |
6221 | if (io->free_iovec) | |
6222 | kfree(io->free_iovec); | |
0e1b6fe3 | 6223 | break; |
e8c2bc1f | 6224 | } |
0e1b6fe3 | 6225 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6226 | case IORING_OP_SENDMSG: { |
6227 | struct io_async_msghdr *io = req->async_data; | |
6228 | if (io->iov != io->fast_iov) | |
6229 | kfree(io->iov); | |
0e1b6fe3 | 6230 | break; |
e8c2bc1f | 6231 | } |
0e1b6fe3 PB |
6232 | case IORING_OP_SPLICE: |
6233 | case IORING_OP_TEE: | |
6234 | io_put_file(req, req->splice.file_in, | |
6235 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6236 | break; | |
f3cd4850 JA |
6237 | case IORING_OP_OPENAT: |
6238 | case IORING_OP_OPENAT2: | |
6239 | if (req->open.filename) | |
6240 | putname(req->open.filename); | |
6241 | break; | |
80a261fd JA |
6242 | case IORING_OP_RENAMEAT: |
6243 | putname(req->rename.oldpath); | |
6244 | putname(req->rename.newpath); | |
6245 | break; | |
14a1143b JA |
6246 | case IORING_OP_UNLINKAT: |
6247 | putname(req->unlink.filename); | |
6248 | break; | |
0e1b6fe3 PB |
6249 | } |
6250 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6251 | } |
99bc4c38 PB |
6252 | } |
6253 | ||
c1379e24 PB |
6254 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6255 | struct io_comp_state *cs) | |
2b188cc1 | 6256 | { |
a197f664 | 6257 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6258 | int ret; |
2b188cc1 | 6259 | |
d625c6ee | 6260 | switch (req->opcode) { |
2b188cc1 | 6261 | case IORING_OP_NOP: |
229a7b63 | 6262 | ret = io_nop(req, cs); |
2b188cc1 JA |
6263 | break; |
6264 | case IORING_OP_READV: | |
edafccee | 6265 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6266 | case IORING_OP_READ: |
a1d7c393 | 6267 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6268 | break; |
3529d8c2 | 6269 | case IORING_OP_WRITEV: |
edafccee | 6270 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6271 | case IORING_OP_WRITE: |
a1d7c393 | 6272 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6273 | break; |
c992fe29 | 6274 | case IORING_OP_FSYNC: |
014db007 | 6275 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6276 | break; |
221c5eb2 | 6277 | case IORING_OP_POLL_ADD: |
014db007 | 6278 | ret = io_poll_add(req); |
221c5eb2 JA |
6279 | break; |
6280 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6281 | ret = io_poll_remove(req); |
221c5eb2 | 6282 | break; |
5d17b4a4 | 6283 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6284 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6285 | break; |
0fa03c62 | 6286 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6287 | ret = io_sendmsg(req, force_nonblock, cs); |
6288 | break; | |
fddaface | 6289 | case IORING_OP_SEND: |
062d04d7 | 6290 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6291 | break; |
aa1fa28f | 6292 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6293 | ret = io_recvmsg(req, force_nonblock, cs); |
6294 | break; | |
fddaface | 6295 | case IORING_OP_RECV: |
062d04d7 | 6296 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6297 | break; |
5262f567 | 6298 | case IORING_OP_TIMEOUT: |
fc4df999 | 6299 | ret = io_timeout(req); |
5262f567 | 6300 | break; |
11365043 | 6301 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6302 | ret = io_timeout_remove(req); |
11365043 | 6303 | break; |
17f2fe35 | 6304 | case IORING_OP_ACCEPT: |
229a7b63 | 6305 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6306 | break; |
f8e85cf2 | 6307 | case IORING_OP_CONNECT: |
229a7b63 | 6308 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6309 | break; |
62755e35 | 6310 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6311 | ret = io_async_cancel(req); |
62755e35 | 6312 | break; |
d63d1b5e | 6313 | case IORING_OP_FALLOCATE: |
014db007 | 6314 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6315 | break; |
15b71abe | 6316 | case IORING_OP_OPENAT: |
014db007 | 6317 | ret = io_openat(req, force_nonblock); |
15b71abe | 6318 | break; |
b5dba59e | 6319 | case IORING_OP_CLOSE: |
229a7b63 | 6320 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6321 | break; |
05f3fb3c | 6322 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6323 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6324 | break; |
eddc7ef5 | 6325 | case IORING_OP_STATX: |
014db007 | 6326 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6327 | break; |
4840e418 | 6328 | case IORING_OP_FADVISE: |
014db007 | 6329 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6330 | break; |
c1ca757b | 6331 | case IORING_OP_MADVISE: |
014db007 | 6332 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6333 | break; |
cebdb986 | 6334 | case IORING_OP_OPENAT2: |
014db007 | 6335 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6336 | break; |
3e4827b0 | 6337 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6338 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6339 | break; |
7d67af2c | 6340 | case IORING_OP_SPLICE: |
014db007 | 6341 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6342 | break; |
ddf0322d | 6343 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6344 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6345 | break; |
067524e9 | 6346 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6347 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6348 | break; |
f2a8d5c7 | 6349 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6350 | ret = io_tee(req, force_nonblock); |
6351 | break; | |
36f4fa68 JA |
6352 | case IORING_OP_SHUTDOWN: |
6353 | ret = io_shutdown(req, force_nonblock); | |
6354 | break; | |
80a261fd JA |
6355 | case IORING_OP_RENAMEAT: |
6356 | ret = io_renameat(req, force_nonblock); | |
6357 | break; | |
14a1143b JA |
6358 | case IORING_OP_UNLINKAT: |
6359 | ret = io_unlinkat(req, force_nonblock); | |
6360 | break; | |
2b188cc1 JA |
6361 | default: |
6362 | ret = -EINVAL; | |
6363 | break; | |
6364 | } | |
6365 | ||
def596e9 JA |
6366 | if (ret) |
6367 | return ret; | |
6368 | ||
b532576e JA |
6369 | /* If the op doesn't have a file, we're not polling for it */ |
6370 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6371 | const bool in_async = io_wq_current_is_worker(); |
6372 | ||
11ba820b JA |
6373 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6374 | if (in_async) | |
6375 | mutex_lock(&ctx->uring_lock); | |
6376 | ||
2e9dbe90 | 6377 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6378 | |
6379 | if (in_async) | |
6380 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6381 | } |
6382 | ||
6383 | return 0; | |
2b188cc1 JA |
6384 | } |
6385 | ||
f4db7182 | 6386 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6387 | { |
6388 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6389 | struct io_kiocb *timeout; |
561fb04a | 6390 | int ret = 0; |
2b188cc1 | 6391 | |
6df1db6b PB |
6392 | timeout = io_prep_linked_timeout(req); |
6393 | if (timeout) | |
6394 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6395 | |
0c9d5ccd JA |
6396 | /* if NO_CANCEL is set, we must still run the work */ |
6397 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6398 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6399 | ret = -ECANCELED; |
0c9d5ccd | 6400 | } |
31b51510 | 6401 | |
561fb04a | 6402 | if (!ret) { |
561fb04a | 6403 | do { |
c1379e24 | 6404 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6405 | /* |
6406 | * We can get EAGAIN for polled IO even though we're | |
6407 | * forcing a sync submission from here, since we can't | |
6408 | * wait for request slots on the block side. | |
6409 | */ | |
6410 | if (ret != -EAGAIN) | |
6411 | break; | |
6412 | cond_resched(); | |
6413 | } while (1); | |
6414 | } | |
31b51510 | 6415 | |
561fb04a | 6416 | if (ret) { |
c07e6719 XW |
6417 | struct io_ring_ctx *lock_ctx = NULL; |
6418 | ||
6419 | if (req->ctx->flags & IORING_SETUP_IOPOLL) | |
6420 | lock_ctx = req->ctx; | |
6421 | ||
dad1b124 | 6422 | /* |
c07e6719 XW |
6423 | * io_iopoll_complete() does not hold completion_lock to |
6424 | * complete polled io, so here for polled io, we can not call | |
6425 | * io_req_complete() directly, otherwise there maybe concurrent | |
6426 | * access to cqring, defer_list, etc, which is not safe. Given | |
6427 | * that io_iopoll_complete() is always called under uring_lock, | |
6428 | * so here for polled io, we also get uring_lock to complete | |
6429 | * it. | |
dad1b124 | 6430 | */ |
c07e6719 XW |
6431 | if (lock_ctx) |
6432 | mutex_lock(&lock_ctx->uring_lock); | |
dad1b124 | 6433 | |
c07e6719 XW |
6434 | req_set_fail_links(req); |
6435 | io_req_complete(req, ret); | |
6436 | ||
6437 | if (lock_ctx) | |
6438 | mutex_unlock(&lock_ctx->uring_lock); | |
edafccee | 6439 | } |
2b188cc1 | 6440 | |
f4db7182 | 6441 | return io_steal_work(req); |
2b188cc1 JA |
6442 | } |
6443 | ||
65e19f54 JA |
6444 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6445 | int index) | |
6446 | { | |
6447 | struct fixed_file_table *table; | |
6448 | ||
05f3fb3c | 6449 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6450 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6451 | } |
6452 | ||
8371adf5 PB |
6453 | static struct file *io_file_get(struct io_submit_state *state, |
6454 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6455 | { |
a197f664 | 6456 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6457 | struct file *file; |
09bb8394 | 6458 | |
8da11c19 | 6459 | if (fixed) { |
479f517b | 6460 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6461 | return NULL; |
b7620121 | 6462 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6463 | file = io_file_from_index(ctx, fd); |
36f72fe2 | 6464 | io_set_resource_node(req); |
09bb8394 | 6465 | } else { |
c826bd7a | 6466 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6467 | file = __io_file_get(state, fd); |
09bb8394 JA |
6468 | } |
6469 | ||
f609cbb8 PB |
6470 | if (file && file->f_op == &io_uring_fops && |
6471 | !(req->flags & REQ_F_INFLIGHT)) { | |
02a13674 JA |
6472 | io_req_init_async(req); |
6473 | req->flags |= REQ_F_INFLIGHT; | |
6474 | ||
6475 | spin_lock_irq(&ctx->inflight_lock); | |
6476 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
6477 | spin_unlock_irq(&ctx->inflight_lock); | |
6478 | } | |
6479 | ||
8371adf5 | 6480 | return file; |
09bb8394 JA |
6481 | } |
6482 | ||
2665abfd | 6483 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6484 | { |
ad8a48ac JA |
6485 | struct io_timeout_data *data = container_of(timer, |
6486 | struct io_timeout_data, timer); | |
90cd7e42 | 6487 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6488 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6489 | unsigned long flags; |
2665abfd JA |
6490 | |
6491 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6492 | prev = req->timeout.head; |
6493 | req->timeout.head = NULL; | |
2665abfd JA |
6494 | |
6495 | /* | |
6496 | * We don't expect the list to be empty, that will only happen if we | |
6497 | * race with the completion of the linked work. | |
6498 | */ | |
90cd7e42 | 6499 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6500 | io_remove_next_linked(prev); |
90cd7e42 PB |
6501 | else |
6502 | prev = NULL; | |
2665abfd JA |
6503 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6504 | ||
6505 | if (prev) { | |
4e88d6e7 | 6506 | req_set_fail_links(prev); |
014db007 | 6507 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6508 | io_put_req(prev); |
47f46768 | 6509 | } else { |
e1e16097 | 6510 | io_req_complete(req, -ETIME); |
2665abfd | 6511 | } |
2665abfd JA |
6512 | return HRTIMER_NORESTART; |
6513 | } | |
6514 | ||
7271ef3a | 6515 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6516 | { |
76a46e06 | 6517 | /* |
f2f87370 PB |
6518 | * If the back reference is NULL, then our linked request finished |
6519 | * before we got a chance to setup the timer | |
76a46e06 | 6520 | */ |
90cd7e42 | 6521 | if (req->timeout.head) { |
e8c2bc1f | 6522 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6523 | |
ad8a48ac JA |
6524 | data->timer.function = io_link_timeout_fn; |
6525 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6526 | data->mode); | |
2665abfd | 6527 | } |
7271ef3a JA |
6528 | } |
6529 | ||
6530 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6531 | { | |
6532 | struct io_ring_ctx *ctx = req->ctx; | |
6533 | ||
6534 | spin_lock_irq(&ctx->completion_lock); | |
6535 | __io_queue_linked_timeout(req); | |
76a46e06 | 6536 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6537 | |
2665abfd | 6538 | /* drop submission reference */ |
76a46e06 JA |
6539 | io_put_req(req); |
6540 | } | |
2665abfd | 6541 | |
ad8a48ac | 6542 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6543 | { |
f2f87370 | 6544 | struct io_kiocb *nxt = req->link; |
2665abfd | 6545 | |
f2f87370 PB |
6546 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6547 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6548 | return NULL; |
2665abfd | 6549 | |
90cd7e42 | 6550 | nxt->timeout.head = req; |
900fad45 | 6551 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6552 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6553 | return nxt; |
2665abfd JA |
6554 | } |
6555 | ||
c1379e24 | 6556 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6557 | { |
4a0a7a18 | 6558 | struct io_kiocb *linked_timeout; |
193155c8 | 6559 | const struct cred *old_creds = NULL; |
e0c5c576 | 6560 | int ret; |
2b188cc1 | 6561 | |
4a0a7a18 JA |
6562 | again: |
6563 | linked_timeout = io_prep_linked_timeout(req); | |
6564 | ||
2e5aa6cb PB |
6565 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6566 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6567 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6568 | if (old_creds) |
6569 | revert_creds(old_creds); | |
98447d65 | 6570 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6571 | old_creds = NULL; /* restored original creds */ |
6572 | else | |
98447d65 | 6573 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6574 | } |
6575 | ||
c1379e24 | 6576 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6577 | |
6578 | /* | |
6579 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6580 | * doesn't support non-blocking read/write attempts | |
6581 | */ | |
24c74678 | 6582 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6583 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6584 | /* |
6585 | * Queued up for async execution, worker will release | |
6586 | * submit reference when the iocb is actually submitted. | |
6587 | */ | |
6588 | io_queue_async_work(req); | |
2b188cc1 | 6589 | } |
bbad27b2 | 6590 | |
f063c547 PB |
6591 | if (linked_timeout) |
6592 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6593 | } else if (likely(!ret)) { |
6594 | /* drop submission reference */ | |
6595 | req = io_put_req_find_next(req); | |
6596 | if (linked_timeout) | |
6597 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6598 | |
0d63c148 PB |
6599 | if (req) { |
6600 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6601 | goto again; | |
6602 | io_queue_async_work(req); | |
6603 | } | |
6604 | } else { | |
652532ad PB |
6605 | /* un-prep timeout, so it'll be killed as any other linked */ |
6606 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6607 | req_set_fail_links(req); |
e65ef56d | 6608 | io_put_req(req); |
e1e16097 | 6609 | io_req_complete(req, ret); |
9e645e11 | 6610 | } |
652532ad | 6611 | |
193155c8 JA |
6612 | if (old_creds) |
6613 | revert_creds(old_creds); | |
2b188cc1 JA |
6614 | } |
6615 | ||
f13fad7b JA |
6616 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6617 | struct io_comp_state *cs) | |
4fe2c963 JL |
6618 | { |
6619 | int ret; | |
6620 | ||
3529d8c2 | 6621 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6622 | if (ret) { |
6623 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6624 | fail_req: |
4e88d6e7 | 6625 | req_set_fail_links(req); |
e1e16097 JA |
6626 | io_put_req(req); |
6627 | io_req_complete(req, ret); | |
4fe2c963 | 6628 | } |
2550878f | 6629 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6630 | if (!req->async_data) { |
bd2ab18a | 6631 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6632 | if (unlikely(ret)) |
bd2ab18a PB |
6633 | goto fail_req; |
6634 | } | |
ce35a47a JA |
6635 | io_queue_async_work(req); |
6636 | } else { | |
c1379e24 PB |
6637 | if (sqe) { |
6638 | ret = io_req_prep(req, sqe); | |
6639 | if (unlikely(ret)) | |
6640 | goto fail_req; | |
6641 | } | |
6642 | __io_queue_sqe(req, cs); | |
ce35a47a | 6643 | } |
4fe2c963 JL |
6644 | } |
6645 | ||
f13fad7b JA |
6646 | static inline void io_queue_link_head(struct io_kiocb *req, |
6647 | struct io_comp_state *cs) | |
4fe2c963 | 6648 | { |
94ae5e77 | 6649 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6650 | io_put_req(req); |
6651 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6652 | } else |
f13fad7b | 6653 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6654 | } |
6655 | ||
863e0560 PB |
6656 | struct io_submit_link { |
6657 | struct io_kiocb *head; | |
6658 | struct io_kiocb *last; | |
6659 | }; | |
6660 | ||
1d4240cc | 6661 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
863e0560 | 6662 | struct io_submit_link *link, struct io_comp_state *cs) |
9e645e11 | 6663 | { |
a197f664 | 6664 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6665 | int ret; |
9e645e11 | 6666 | |
9e645e11 JA |
6667 | /* |
6668 | * If we already have a head request, queue this one for async | |
6669 | * submittal once the head completes. If we don't have a head but | |
6670 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6671 | * submitted sync once the chain is complete. If none of those | |
6672 | * conditions are true (normal request), then just queue it. | |
6673 | */ | |
863e0560 PB |
6674 | if (link->head) { |
6675 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6676 | |
8cdf2193 PB |
6677 | /* |
6678 | * Taking sequential execution of a link, draining both sides | |
6679 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6680 | * requests in the link. So, it drains the head and the | |
6681 | * next after the link request. The last one is done via | |
6682 | * drain_next flag to persist the effect across calls. | |
6683 | */ | |
ef4ff581 | 6684 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6685 | head->flags |= REQ_F_IO_DRAIN; |
6686 | ctx->drain_next = 1; | |
6687 | } | |
3529d8c2 | 6688 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6689 | if (unlikely(ret)) { |
4e88d6e7 | 6690 | /* fail even hard links since we don't submit */ |
9d76377f | 6691 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6692 | return ret; |
2d28390a | 6693 | } |
9d76377f | 6694 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6695 | link->last->link = req; |
863e0560 | 6696 | link->last = req; |
32fe525b PB |
6697 | |
6698 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6699 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6700 | io_queue_link_head(head, cs); |
863e0560 | 6701 | link->head = NULL; |
32fe525b | 6702 | } |
9e645e11 | 6703 | } else { |
711be031 PB |
6704 | if (unlikely(ctx->drain_next)) { |
6705 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6706 | ctx->drain_next = 0; |
711be031 | 6707 | } |
ef4ff581 | 6708 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6709 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6710 | if (unlikely(ret)) |
711be031 | 6711 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6712 | link->head = req; |
6713 | link->last = req; | |
711be031 | 6714 | } else { |
f13fad7b | 6715 | io_queue_sqe(req, sqe, cs); |
711be031 | 6716 | } |
9e645e11 | 6717 | } |
2e6e1fde | 6718 | |
1d4240cc | 6719 | return 0; |
9e645e11 JA |
6720 | } |
6721 | ||
9a56a232 JA |
6722 | /* |
6723 | * Batched submission is done, ensure local IO is flushed out. | |
6724 | */ | |
6725 | static void io_submit_state_end(struct io_submit_state *state) | |
6726 | { | |
f13fad7b JA |
6727 | if (!list_empty(&state->comp.list)) |
6728 | io_submit_flush_completions(&state->comp); | |
27926b68 JA |
6729 | if (state->plug_started) |
6730 | blk_finish_plug(&state->plug); | |
9f13c35b | 6731 | io_state_file_put(state); |
2579f913 | 6732 | if (state->free_reqs) |
6c8a3134 | 6733 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6734 | } |
6735 | ||
6736 | /* | |
6737 | * Start submission side cache. | |
6738 | */ | |
6739 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6740 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 | 6741 | { |
27926b68 | 6742 | state->plug_started = false; |
013538bd JA |
6743 | state->comp.nr = 0; |
6744 | INIT_LIST_HEAD(&state->comp.list); | |
6745 | state->comp.ctx = ctx; | |
2579f913 | 6746 | state->free_reqs = 0; |
6e1271e6 | 6747 | state->file_refs = 0; |
9a56a232 JA |
6748 | state->ios_left = max_ios; |
6749 | } | |
6750 | ||
2b188cc1 JA |
6751 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6752 | { | |
75b28aff | 6753 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6754 | |
caf582c6 PB |
6755 | /* |
6756 | * Ensure any loads from the SQEs are done at this point, | |
6757 | * since once we write the new head, the application could | |
6758 | * write new data to them. | |
6759 | */ | |
6760 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6761 | } |
6762 | ||
2b188cc1 | 6763 | /* |
3529d8c2 | 6764 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6765 | * that is mapped by userspace. This means that care needs to be taken to |
6766 | * ensure that reads are stable, as we cannot rely on userspace always | |
6767 | * being a good citizen. If members of the sqe are validated and then later | |
6768 | * used, it's important that those reads are done through READ_ONCE() to | |
6769 | * prevent a re-load down the line. | |
6770 | */ | |
709b302f | 6771 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6772 | { |
75b28aff | 6773 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6774 | unsigned head; |
6775 | ||
6776 | /* | |
6777 | * The cached sq head (or cq tail) serves two purposes: | |
6778 | * | |
6779 | * 1) allows us to batch the cost of updating the user visible | |
6780 | * head updates. | |
6781 | * 2) allows the kernel side to track the head on its own, even | |
6782 | * though the application is the one updating it. | |
6783 | */ | |
ee7d46d9 | 6784 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6785 | if (likely(head < ctx->sq_entries)) |
6786 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6787 | |
6788 | /* drop invalid entries */ | |
498ccd9e | 6789 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6790 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6791 | return NULL; |
6792 | } | |
6793 | ||
6794 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6795 | { | |
6796 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6797 | } |
6798 | ||
21b55dbc SG |
6799 | /* |
6800 | * Check SQE restrictions (opcode and flags). | |
6801 | * | |
6802 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6803 | */ | |
6804 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6805 | struct io_kiocb *req, | |
6806 | unsigned int sqe_flags) | |
6807 | { | |
6808 | if (!ctx->restricted) | |
6809 | return true; | |
6810 | ||
6811 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6812 | return false; | |
6813 | ||
6814 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6815 | ctx->restrictions.sqe_flags_required) | |
6816 | return false; | |
6817 | ||
6818 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6819 | ctx->restrictions.sqe_flags_required)) | |
6820 | return false; | |
6821 | ||
6822 | return true; | |
6823 | } | |
6824 | ||
ef4ff581 PB |
6825 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6826 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6827 | IOSQE_BUFFER_SELECT) | |
6828 | ||
6829 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6830 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6831 | struct io_submit_state *state) |
0553b8bd | 6832 | { |
ef4ff581 | 6833 | unsigned int sqe_flags; |
71b547c0 | 6834 | int id, ret; |
ef4ff581 | 6835 | |
0553b8bd PB |
6836 | req->opcode = READ_ONCE(sqe->opcode); |
6837 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6838 | req->async_data = NULL; |
0553b8bd PB |
6839 | req->file = NULL; |
6840 | req->ctx = ctx; | |
6841 | req->flags = 0; | |
f2f87370 | 6842 | req->link = NULL; |
36f72fe2 | 6843 | req->fixed_file_refs = NULL; |
0553b8bd PB |
6844 | /* one is dropped after submission, the other at completion */ |
6845 | refcount_set(&req->refs, 2); | |
4dd2824d | 6846 | req->task = current; |
0553b8bd | 6847 | req->result = 0; |
ef4ff581 PB |
6848 | |
6849 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6850 | return -EINVAL; | |
6851 | ||
28cea78a | 6852 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6853 | return -EFAULT; |
ef4ff581 PB |
6854 | |
6855 | sqe_flags = READ_ONCE(sqe->flags); | |
6856 | /* enforce forwards compatibility on users */ | |
6857 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6858 | return -EINVAL; | |
6859 | ||
21b55dbc SG |
6860 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6861 | return -EACCES; | |
6862 | ||
ef4ff581 PB |
6863 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6864 | !io_op_defs[req->opcode].buffer_select) | |
6865 | return -EOPNOTSUPP; | |
6866 | ||
6867 | id = READ_ONCE(sqe->personality); | |
6868 | if (id) { | |
1e6fa521 JA |
6869 | struct io_identity *iod; |
6870 | ||
1e6fa521 JA |
6871 | iod = idr_find(&ctx->personality_idr, id); |
6872 | if (unlikely(!iod)) | |
ef4ff581 | 6873 | return -EINVAL; |
1e6fa521 | 6874 | refcount_inc(&iod->count); |
ec99ca6c PB |
6875 | |
6876 | __io_req_init_async(req); | |
1e6fa521 JA |
6877 | get_cred(iod->creds); |
6878 | req->work.identity = iod; | |
dfead8a8 | 6879 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6880 | } |
6881 | ||
6882 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6883 | req->flags |= sqe_flags; |
ef4ff581 | 6884 | |
27926b68 JA |
6885 | /* |
6886 | * Plug now if we have more than 1 IO left after this, and the target | |
6887 | * is potentially a read/write to block based storage. | |
6888 | */ | |
6889 | if (!state->plug_started && state->ios_left > 1 && | |
6890 | io_op_defs[req->opcode].plug) { | |
6891 | blk_start_plug(&state->plug); | |
6892 | state->plug_started = true; | |
6893 | } | |
6894 | ||
bd5bbda7 PB |
6895 | ret = 0; |
6896 | if (io_op_defs[req->opcode].needs_file) { | |
6897 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6898 | ||
6899 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
6900 | if (unlikely(!req->file && | |
6901 | !io_op_defs[req->opcode].needs_file_no_error)) | |
6902 | ret = -EBADF; | |
6903 | } | |
63ff8223 | 6904 | |
71b547c0 PB |
6905 | state->ios_left--; |
6906 | return ret; | |
0553b8bd PB |
6907 | } |
6908 | ||
0f212204 | 6909 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6910 | { |
ac8691c4 | 6911 | struct io_submit_state state; |
863e0560 | 6912 | struct io_submit_link link; |
9e645e11 | 6913 | int i, submitted = 0; |
6c271ce2 | 6914 | |
c4a2ed72 | 6915 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 | 6916 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6c503150 | 6917 | if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6918 | return -EBUSY; |
6919 | } | |
6c271ce2 | 6920 | |
ee7d46d9 PB |
6921 | /* make sure SQ entry isn't read before tail */ |
6922 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6923 | |
2b85edfc PB |
6924 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6925 | return -EAGAIN; | |
6c271ce2 | 6926 | |
d8a6df10 | 6927 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6928 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6929 | |
013538bd | 6930 | io_submit_state_start(&state, ctx, nr); |
863e0560 | 6931 | link.head = NULL; |
b14cca0c | 6932 | |
6c271ce2 | 6933 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6934 | const struct io_uring_sqe *sqe; |
196be95c | 6935 | struct io_kiocb *req; |
1cb1edb2 | 6936 | int err; |
fb5ccc98 | 6937 | |
b1e50e54 PB |
6938 | sqe = io_get_sqe(ctx); |
6939 | if (unlikely(!sqe)) { | |
6940 | io_consume_sqe(ctx); | |
6941 | break; | |
6942 | } | |
ac8691c4 | 6943 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6944 | if (unlikely(!req)) { |
6945 | if (!submitted) | |
6946 | submitted = -EAGAIN; | |
fb5ccc98 | 6947 | break; |
196be95c | 6948 | } |
709b302f | 6949 | io_consume_sqe(ctx); |
d3656344 JA |
6950 | /* will complete beyond this point, count as submitted */ |
6951 | submitted++; | |
6952 | ||
692d8363 | 6953 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6954 | if (unlikely(err)) { |
1cb1edb2 | 6955 | fail_req: |
e1e16097 JA |
6956 | io_put_req(req); |
6957 | io_req_complete(req, err); | |
196be95c PB |
6958 | break; |
6959 | } | |
fb5ccc98 | 6960 | |
354420f7 | 6961 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6962 | true, io_async_submit(ctx)); |
f13fad7b | 6963 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6964 | if (err) |
6965 | goto fail_req; | |
6c271ce2 JA |
6966 | } |
6967 | ||
9466f437 PB |
6968 | if (unlikely(submitted != nr)) { |
6969 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6970 | struct io_uring_task *tctx = current->io_uring; |
6971 | int unused = nr - ref_used; | |
9466f437 | 6972 | |
d8a6df10 JA |
6973 | percpu_ref_put_many(&ctx->refs, unused); |
6974 | percpu_counter_sub(&tctx->inflight, unused); | |
6975 | put_task_struct_many(current, unused); | |
9466f437 | 6976 | } |
863e0560 PB |
6977 | if (link.head) |
6978 | io_queue_link_head(link.head, &state.comp); | |
ac8691c4 | 6979 | io_submit_state_end(&state); |
6c271ce2 | 6980 | |
ae9428ca PB |
6981 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6982 | io_commit_sqring(ctx); | |
6983 | ||
6c271ce2 JA |
6984 | return submitted; |
6985 | } | |
6986 | ||
23b3628e XW |
6987 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6988 | { | |
6989 | /* Tell userspace we may need a wakeup call */ | |
6990 | spin_lock_irq(&ctx->completion_lock); | |
6991 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6992 | spin_unlock_irq(&ctx->completion_lock); | |
6993 | } | |
6994 | ||
6995 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6996 | { | |
6997 | spin_lock_irq(&ctx->completion_lock); | |
6998 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6999 | spin_unlock_irq(&ctx->completion_lock); | |
7000 | } | |
7001 | ||
08369246 | 7002 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7003 | { |
c8d1ba58 | 7004 | unsigned int to_submit; |
bdcd3eab | 7005 | int ret = 0; |
6c271ce2 | 7006 | |
c8d1ba58 | 7007 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
7008 | /* if we're handling multiple rings, cap submit size for fairness */ |
7009 | if (cap_entries && to_submit > 8) | |
7010 | to_submit = 8; | |
7011 | ||
906a3c6f | 7012 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7013 | unsigned nr_events = 0; |
a4c0b3de | 7014 | |
c8d1ba58 | 7015 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7016 | if (!list_empty(&ctx->iopoll_list)) |
c8d1ba58 | 7017 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7018 | |
d9d05217 PB |
7019 | if (to_submit && !ctx->sqo_dead && |
7020 | likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 | 7021 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 JA |
7022 | mutex_unlock(&ctx->uring_lock); |
7023 | } | |
6c271ce2 | 7024 | |
90554200 JA |
7025 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7026 | wake_up(&ctx->sqo_sq_wait); | |
6c271ce2 | 7027 | |
08369246 XW |
7028 | return ret; |
7029 | } | |
6c271ce2 | 7030 | |
08369246 XW |
7031 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7032 | { | |
7033 | struct io_ring_ctx *ctx; | |
7034 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7035 | |
08369246 XW |
7036 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7037 | if (sq_thread_idle < ctx->sq_thread_idle) | |
7038 | sq_thread_idle = ctx->sq_thread_idle; | |
c8d1ba58 | 7039 | } |
c1edbf5f | 7040 | |
08369246 | 7041 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7042 | } |
6c271ce2 | 7043 | |
69fb2131 JA |
7044 | static void io_sqd_init_new(struct io_sq_data *sqd) |
7045 | { | |
7046 | struct io_ring_ctx *ctx; | |
7047 | ||
7048 | while (!list_empty(&sqd->ctx_new_list)) { | |
7049 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
7050 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
7051 | complete(&ctx->sq_thread_comp); | |
7052 | } | |
08369246 XW |
7053 | |
7054 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
7055 | } |
7056 | ||
c8d1ba58 JA |
7057 | static int io_sq_thread(void *data) |
7058 | { | |
91d8f519 | 7059 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
7060 | struct files_struct *old_files = current->files; |
7061 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
7062 | const struct cred *old_cred = NULL; |
7063 | struct io_sq_data *sqd = data; | |
7064 | struct io_ring_ctx *ctx; | |
a0d9205f | 7065 | unsigned long timeout = 0; |
08369246 | 7066 | DEFINE_WAIT(wait); |
6c271ce2 | 7067 | |
28cea78a JA |
7068 | task_lock(current); |
7069 | current->files = NULL; | |
7070 | current->nsproxy = NULL; | |
7071 | task_unlock(current); | |
6c271ce2 | 7072 | |
69fb2131 | 7073 | while (!kthread_should_stop()) { |
08369246 XW |
7074 | int ret; |
7075 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
7076 | |
7077 | /* | |
69fb2131 JA |
7078 | * Any changes to the sqd lists are synchronized through the |
7079 | * kthread parking. This synchronizes the thread vs users, | |
7080 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 7081 | */ |
65b2b213 | 7082 | if (kthread_should_park()) { |
69fb2131 | 7083 | kthread_parkme(); |
65b2b213 XW |
7084 | /* |
7085 | * When sq thread is unparked, in case the previous park operation | |
7086 | * comes from io_put_sq_data(), which means that sq thread is going | |
7087 | * to be stopped, so here needs to have a check. | |
7088 | */ | |
7089 | if (kthread_should_stop()) | |
7090 | break; | |
7091 | } | |
7143b5ac | 7092 | |
08369246 | 7093 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 7094 | io_sqd_init_new(sqd); |
08369246 XW |
7095 | timeout = jiffies + sqd->sq_thread_idle; |
7096 | } | |
6c271ce2 | 7097 | |
08369246 | 7098 | sqt_spin = false; |
e95eee2d | 7099 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
7100 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7101 | if (current->cred != ctx->creds) { | |
7102 | if (old_cred) | |
7103 | revert_creds(old_cred); | |
7104 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7105 | } |
91d8f519 | 7106 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7107 | #ifdef CONFIG_AUDIT |
7108 | current->loginuid = ctx->loginuid; | |
7109 | current->sessionid = ctx->sessionid; | |
7110 | #endif | |
bdcd3eab | 7111 | |
08369246 XW |
7112 | ret = __io_sq_thread(ctx, cap_entries); |
7113 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
7114 | sqt_spin = true; | |
6c271ce2 | 7115 | |
28cea78a | 7116 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7117 | } |
6c271ce2 | 7118 | |
08369246 | 7119 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7120 | io_run_task_work(); |
d434ab6d | 7121 | io_sq_thread_drop_mm_files(); |
c8d1ba58 | 7122 | cond_resched(); |
08369246 XW |
7123 | if (sqt_spin) |
7124 | timeout = jiffies + sqd->sq_thread_idle; | |
7125 | continue; | |
7126 | } | |
7127 | ||
7128 | if (kthread_should_park()) | |
7129 | continue; | |
7130 | ||
7131 | needs_sched = true; | |
7132 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
7133 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
7134 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
7135 | !list_empty_careful(&ctx->iopoll_list)) { | |
7136 | needs_sched = false; | |
7137 | break; | |
7138 | } | |
7139 | if (io_sqring_entries(ctx)) { | |
7140 | needs_sched = false; | |
7141 | break; | |
7142 | } | |
7143 | } | |
7144 | ||
7145 | if (needs_sched) { | |
69fb2131 JA |
7146 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7147 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 7148 | |
69fb2131 | 7149 | schedule(); |
69fb2131 JA |
7150 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7151 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7152 | } |
08369246 XW |
7153 | |
7154 | finish_wait(&sqd->wait, &wait); | |
7155 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
7156 | } |
7157 | ||
4c6e277c | 7158 | io_run_task_work(); |
d434ab6d | 7159 | io_sq_thread_drop_mm_files(); |
b41e9852 | 7160 | |
91d8f519 DZ |
7161 | if (cur_css) |
7162 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7163 | if (old_cred) |
7164 | revert_creds(old_cred); | |
06058632 | 7165 | |
28cea78a JA |
7166 | task_lock(current); |
7167 | current->files = old_files; | |
7168 | current->nsproxy = old_nsproxy; | |
7169 | task_unlock(current); | |
7170 | ||
2bbcd6d3 | 7171 | kthread_parkme(); |
06058632 | 7172 | |
6c271ce2 JA |
7173 | return 0; |
7174 | } | |
7175 | ||
bda52162 JA |
7176 | struct io_wait_queue { |
7177 | struct wait_queue_entry wq; | |
7178 | struct io_ring_ctx *ctx; | |
7179 | unsigned to_wait; | |
7180 | unsigned nr_timeouts; | |
7181 | }; | |
7182 | ||
6c503150 | 7183 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7184 | { |
7185 | struct io_ring_ctx *ctx = iowq->ctx; | |
7186 | ||
7187 | /* | |
d195a66e | 7188 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7189 | * started waiting. For timeouts, we always want to return to userspace, |
7190 | * regardless of event count. | |
7191 | */ | |
6c503150 | 7192 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
7193 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7194 | } | |
7195 | ||
7196 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7197 | int wake_flags, void *key) | |
7198 | { | |
7199 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7200 | wq); | |
7201 | ||
6c503150 PB |
7202 | /* |
7203 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7204 | * the task, and the next invocation will do it. | |
7205 | */ | |
7206 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow)) | |
7207 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7208 | return -1; | |
bda52162 JA |
7209 | } |
7210 | ||
af9c1a44 JA |
7211 | static int io_run_task_work_sig(void) |
7212 | { | |
7213 | if (io_run_task_work()) | |
7214 | return 1; | |
7215 | if (!signal_pending(current)) | |
7216 | return 0; | |
792ee0f6 JA |
7217 | if (test_tsk_thread_flag(current, TIF_NOTIFY_SIGNAL)) |
7218 | return -ERESTARTSYS; | |
af9c1a44 JA |
7219 | return -EINTR; |
7220 | } | |
7221 | ||
2b188cc1 JA |
7222 | /* |
7223 | * Wait until events become available, if we don't already have some. The | |
7224 | * application must reap them itself, as they reside on the shared cq ring. | |
7225 | */ | |
7226 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7227 | const sigset_t __user *sig, size_t sigsz, |
7228 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7229 | { |
bda52162 JA |
7230 | struct io_wait_queue iowq = { |
7231 | .wq = { | |
7232 | .private = current, | |
7233 | .func = io_wake_function, | |
7234 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7235 | }, | |
7236 | .ctx = ctx, | |
7237 | .to_wait = min_events, | |
7238 | }; | |
75b28aff | 7239 | struct io_rings *rings = ctx->rings; |
c73ebb68 HX |
7240 | struct timespec64 ts; |
7241 | signed long timeout = 0; | |
e9ffa5c2 | 7242 | int ret = 0; |
2b188cc1 | 7243 | |
b41e9852 | 7244 | do { |
6c503150 PB |
7245 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
7246 | if (io_cqring_events(ctx) >= min_events) | |
b41e9852 | 7247 | return 0; |
4c6e277c | 7248 | if (!io_run_task_work()) |
b41e9852 | 7249 | break; |
b41e9852 | 7250 | } while (1); |
2b188cc1 JA |
7251 | |
7252 | if (sig) { | |
9e75ad5d AB |
7253 | #ifdef CONFIG_COMPAT |
7254 | if (in_compat_syscall()) | |
7255 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7256 | sigsz); |
9e75ad5d AB |
7257 | else |
7258 | #endif | |
b772434b | 7259 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7260 | |
2b188cc1 JA |
7261 | if (ret) |
7262 | return ret; | |
7263 | } | |
7264 | ||
c73ebb68 HX |
7265 | if (uts) { |
7266 | if (get_timespec64(&ts, uts)) | |
7267 | return -EFAULT; | |
7268 | timeout = timespec64_to_jiffies(&ts); | |
7269 | } | |
7270 | ||
bda52162 | 7271 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7272 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7273 | do { |
6c503150 | 7274 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
bda52162 JA |
7275 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, |
7276 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7277 | /* make sure we run task_work before checking for signals */ |
af9c1a44 | 7278 | ret = io_run_task_work_sig(); |
6195ba09 HX |
7279 | if (ret > 0) { |
7280 | finish_wait(&ctx->wait, &iowq.wq); | |
4c6e277c | 7281 | continue; |
6195ba09 | 7282 | } |
af9c1a44 | 7283 | else if (ret < 0) |
bda52162 | 7284 | break; |
6c503150 | 7285 | if (io_should_wake(&iowq)) |
ce593a6c | 7286 | break; |
6195ba09 HX |
7287 | if (test_bit(0, &ctx->cq_check_overflow)) { |
7288 | finish_wait(&ctx->wait, &iowq.wq); | |
6c503150 | 7289 | continue; |
6195ba09 | 7290 | } |
c73ebb68 HX |
7291 | if (uts) { |
7292 | timeout = schedule_timeout(timeout); | |
7293 | if (timeout == 0) { | |
7294 | ret = -ETIME; | |
7295 | break; | |
7296 | } | |
7297 | } else { | |
7298 | schedule(); | |
7299 | } | |
bda52162 JA |
7300 | } while (1); |
7301 | finish_wait(&ctx->wait, &iowq.wq); | |
7302 | ||
b7db41c9 | 7303 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7304 | |
75b28aff | 7305 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7306 | } |
7307 | ||
6b06314c JA |
7308 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7309 | { | |
7310 | #if defined(CONFIG_UNIX) | |
7311 | if (ctx->ring_sock) { | |
7312 | struct sock *sock = ctx->ring_sock->sk; | |
7313 | struct sk_buff *skb; | |
7314 | ||
7315 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7316 | kfree_skb(skb); | |
7317 | } | |
7318 | #else | |
7319 | int i; | |
7320 | ||
65e19f54 JA |
7321 | for (i = 0; i < ctx->nr_user_files; i++) { |
7322 | struct file *file; | |
7323 | ||
7324 | file = io_file_from_index(ctx, i); | |
7325 | if (file) | |
7326 | fput(file); | |
7327 | } | |
6b06314c JA |
7328 | #endif |
7329 | } | |
7330 | ||
05f3fb3c JA |
7331 | static void io_file_ref_kill(struct percpu_ref *ref) |
7332 | { | |
7333 | struct fixed_file_data *data; | |
7334 | ||
7335 | data = container_of(ref, struct fixed_file_data, refs); | |
7336 | complete(&data->done); | |
7337 | } | |
7338 | ||
1642b445 PB |
7339 | static void io_sqe_files_set_node(struct fixed_file_data *file_data, |
7340 | struct fixed_file_ref_node *ref_node) | |
7341 | { | |
7342 | spin_lock_bh(&file_data->lock); | |
7343 | file_data->node = ref_node; | |
7344 | list_add_tail(&ref_node->node, &file_data->ref_list); | |
7345 | spin_unlock_bh(&file_data->lock); | |
7346 | percpu_ref_get(&file_data->refs); | |
7347 | } | |
7348 | ||
6b06314c JA |
7349 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7350 | { | |
05f3fb3c | 7351 | struct fixed_file_data *data = ctx->file_data; |
1ffc5422 | 7352 | struct fixed_file_ref_node *backup_node, *ref_node = NULL; |
65e19f54 | 7353 | unsigned nr_tables, i; |
1ffc5422 | 7354 | int ret; |
65e19f54 | 7355 | |
05f3fb3c | 7356 | if (!data) |
6b06314c | 7357 | return -ENXIO; |
1ffc5422 PB |
7358 | backup_node = alloc_fixed_file_ref_node(ctx); |
7359 | if (!backup_node) | |
7360 | return -ENOMEM; | |
6b06314c | 7361 | |
ac0648a5 | 7362 | spin_lock_bh(&data->lock); |
1e5d770b | 7363 | ref_node = data->node; |
ac0648a5 | 7364 | spin_unlock_bh(&data->lock); |
05589553 XW |
7365 | if (ref_node) |
7366 | percpu_ref_kill(&ref_node->refs); | |
7367 | ||
7368 | percpu_ref_kill(&data->refs); | |
7369 | ||
7370 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7371 | flush_delayed_work(&ctx->file_put_work); |
1ffc5422 PB |
7372 | do { |
7373 | ret = wait_for_completion_interruptible(&data->done); | |
7374 | if (!ret) | |
7375 | break; | |
7376 | ret = io_run_task_work_sig(); | |
7377 | if (ret < 0) { | |
7378 | percpu_ref_resurrect(&data->refs); | |
7379 | reinit_completion(&data->done); | |
7380 | io_sqe_files_set_node(data, backup_node); | |
7381 | return ret; | |
7382 | } | |
7383 | } while (1); | |
05f3fb3c | 7384 | |
6b06314c | 7385 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7386 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7387 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7388 | kfree(data->table[i].files); |
7389 | kfree(data->table); | |
05589553 XW |
7390 | percpu_ref_exit(&data->refs); |
7391 | kfree(data); | |
05f3fb3c | 7392 | ctx->file_data = NULL; |
6b06314c | 7393 | ctx->nr_user_files = 0; |
1ffc5422 | 7394 | destroy_fixed_file_ref_node(backup_node); |
6b06314c JA |
7395 | return 0; |
7396 | } | |
7397 | ||
534ca6d6 | 7398 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7399 | { |
534ca6d6 | 7400 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7401 | /* |
7402 | * The park is a bit of a work-around, without it we get | |
7403 | * warning spews on shutdown with SQPOLL set and affinity | |
7404 | * set to a single CPU. | |
7405 | */ | |
534ca6d6 JA |
7406 | if (sqd->thread) { |
7407 | kthread_park(sqd->thread); | |
7408 | kthread_stop(sqd->thread); | |
7409 | } | |
7410 | ||
7411 | kfree(sqd); | |
7412 | } | |
7413 | } | |
7414 | ||
aa06165d JA |
7415 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7416 | { | |
7417 | struct io_ring_ctx *ctx_attach; | |
7418 | struct io_sq_data *sqd; | |
7419 | struct fd f; | |
7420 | ||
7421 | f = fdget(p->wq_fd); | |
7422 | if (!f.file) | |
7423 | return ERR_PTR(-ENXIO); | |
7424 | if (f.file->f_op != &io_uring_fops) { | |
7425 | fdput(f); | |
7426 | return ERR_PTR(-EINVAL); | |
7427 | } | |
7428 | ||
7429 | ctx_attach = f.file->private_data; | |
7430 | sqd = ctx_attach->sq_data; | |
7431 | if (!sqd) { | |
7432 | fdput(f); | |
7433 | return ERR_PTR(-EINVAL); | |
7434 | } | |
7435 | ||
7436 | refcount_inc(&sqd->refs); | |
7437 | fdput(f); | |
7438 | return sqd; | |
7439 | } | |
7440 | ||
534ca6d6 JA |
7441 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7442 | { | |
7443 | struct io_sq_data *sqd; | |
7444 | ||
aa06165d JA |
7445 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7446 | return io_attach_sq_data(p); | |
7447 | ||
534ca6d6 JA |
7448 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7449 | if (!sqd) | |
7450 | return ERR_PTR(-ENOMEM); | |
7451 | ||
7452 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7453 | INIT_LIST_HEAD(&sqd->ctx_list); |
7454 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7455 | mutex_init(&sqd->ctx_lock); | |
7456 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7457 | init_waitqueue_head(&sqd->wait); |
7458 | return sqd; | |
7459 | } | |
7460 | ||
69fb2131 JA |
7461 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7462 | __releases(&sqd->lock) | |
7463 | { | |
7464 | if (!sqd->thread) | |
7465 | return; | |
7466 | kthread_unpark(sqd->thread); | |
7467 | mutex_unlock(&sqd->lock); | |
7468 | } | |
7469 | ||
7470 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7471 | __acquires(&sqd->lock) | |
7472 | { | |
7473 | if (!sqd->thread) | |
7474 | return; | |
7475 | mutex_lock(&sqd->lock); | |
7476 | kthread_park(sqd->thread); | |
7477 | } | |
7478 | ||
534ca6d6 JA |
7479 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7480 | { | |
7481 | struct io_sq_data *sqd = ctx->sq_data; | |
7482 | ||
7483 | if (sqd) { | |
7484 | if (sqd->thread) { | |
7485 | /* | |
7486 | * We may arrive here from the error branch in | |
7487 | * io_sq_offload_create() where the kthread is created | |
7488 | * without being waked up, thus wake it up now to make | |
7489 | * sure the wait will complete. | |
7490 | */ | |
7491 | wake_up_process(sqd->thread); | |
7492 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7493 | |
7494 | io_sq_thread_park(sqd); | |
7495 | } | |
7496 | ||
7497 | mutex_lock(&sqd->ctx_lock); | |
7498 | list_del(&ctx->sqd_list); | |
08369246 | 7499 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7500 | mutex_unlock(&sqd->ctx_lock); |
7501 | ||
08369246 | 7502 | if (sqd->thread) |
69fb2131 | 7503 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7504 | |
7505 | io_put_sq_data(sqd); | |
7506 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7507 | } |
7508 | } | |
7509 | ||
6b06314c JA |
7510 | static void io_finish_async(struct io_ring_ctx *ctx) |
7511 | { | |
6c271ce2 JA |
7512 | io_sq_thread_stop(ctx); |
7513 | ||
561fb04a JA |
7514 | if (ctx->io_wq) { |
7515 | io_wq_destroy(ctx->io_wq); | |
7516 | ctx->io_wq = NULL; | |
6b06314c JA |
7517 | } |
7518 | } | |
7519 | ||
7520 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7521 | /* |
7522 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7523 | * the io_uring can be safely unregistered on process exit, even if we have | |
7524 | * loops in the file referencing. | |
7525 | */ | |
7526 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7527 | { | |
7528 | struct sock *sk = ctx->ring_sock->sk; | |
7529 | struct scm_fp_list *fpl; | |
7530 | struct sk_buff *skb; | |
08a45173 | 7531 | int i, nr_files; |
6b06314c | 7532 | |
6b06314c JA |
7533 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7534 | if (!fpl) | |
7535 | return -ENOMEM; | |
7536 | ||
7537 | skb = alloc_skb(0, GFP_KERNEL); | |
7538 | if (!skb) { | |
7539 | kfree(fpl); | |
7540 | return -ENOMEM; | |
7541 | } | |
7542 | ||
7543 | skb->sk = sk; | |
6b06314c | 7544 | |
08a45173 | 7545 | nr_files = 0; |
6b06314c JA |
7546 | fpl->user = get_uid(ctx->user); |
7547 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7548 | struct file *file = io_file_from_index(ctx, i + offset); |
7549 | ||
7550 | if (!file) | |
08a45173 | 7551 | continue; |
65e19f54 | 7552 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7553 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7554 | nr_files++; | |
6b06314c JA |
7555 | } |
7556 | ||
08a45173 JA |
7557 | if (nr_files) { |
7558 | fpl->max = SCM_MAX_FD; | |
7559 | fpl->count = nr_files; | |
7560 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7561 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7562 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7563 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7564 | |
08a45173 JA |
7565 | for (i = 0; i < nr_files; i++) |
7566 | fput(fpl->fp[i]); | |
7567 | } else { | |
7568 | kfree_skb(skb); | |
7569 | kfree(fpl); | |
7570 | } | |
6b06314c JA |
7571 | |
7572 | return 0; | |
7573 | } | |
7574 | ||
7575 | /* | |
7576 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7577 | * causes regular reference counting to break down. We rely on the UNIX | |
7578 | * garbage collection to take care of this problem for us. | |
7579 | */ | |
7580 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7581 | { | |
7582 | unsigned left, total; | |
7583 | int ret = 0; | |
7584 | ||
7585 | total = 0; | |
7586 | left = ctx->nr_user_files; | |
7587 | while (left) { | |
7588 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7589 | |
7590 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7591 | if (ret) | |
7592 | break; | |
7593 | left -= this_files; | |
7594 | total += this_files; | |
7595 | } | |
7596 | ||
7597 | if (!ret) | |
7598 | return 0; | |
7599 | ||
7600 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7601 | struct file *file = io_file_from_index(ctx, total); |
7602 | ||
7603 | if (file) | |
7604 | fput(file); | |
6b06314c JA |
7605 | total++; |
7606 | } | |
7607 | ||
7608 | return ret; | |
7609 | } | |
7610 | #else | |
7611 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7612 | { | |
7613 | return 0; | |
7614 | } | |
7615 | #endif | |
7616 | ||
5398ae69 PB |
7617 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7618 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7619 | { |
7620 | int i; | |
7621 | ||
7622 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7623 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7624 | unsigned this_files; |
7625 | ||
7626 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7627 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7628 | GFP_KERNEL); | |
7629 | if (!table->files) | |
7630 | break; | |
7631 | nr_files -= this_files; | |
7632 | } | |
7633 | ||
7634 | if (i == nr_tables) | |
7635 | return 0; | |
7636 | ||
7637 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7638 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7639 | kfree(table->files); |
7640 | } | |
7641 | return 1; | |
7642 | } | |
7643 | ||
05f3fb3c JA |
7644 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7645 | { | |
7646 | #if defined(CONFIG_UNIX) | |
7647 | struct sock *sock = ctx->ring_sock->sk; | |
7648 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7649 | struct sk_buff *skb; | |
7650 | int i; | |
7651 | ||
7652 | __skb_queue_head_init(&list); | |
7653 | ||
7654 | /* | |
7655 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7656 | * remove this entry and rearrange the file array. | |
7657 | */ | |
7658 | skb = skb_dequeue(head); | |
7659 | while (skb) { | |
7660 | struct scm_fp_list *fp; | |
7661 | ||
7662 | fp = UNIXCB(skb).fp; | |
7663 | for (i = 0; i < fp->count; i++) { | |
7664 | int left; | |
7665 | ||
7666 | if (fp->fp[i] != file) | |
7667 | continue; | |
7668 | ||
7669 | unix_notinflight(fp->user, fp->fp[i]); | |
7670 | left = fp->count - 1 - i; | |
7671 | if (left) { | |
7672 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7673 | left * sizeof(struct file *)); | |
7674 | } | |
7675 | fp->count--; | |
7676 | if (!fp->count) { | |
7677 | kfree_skb(skb); | |
7678 | skb = NULL; | |
7679 | } else { | |
7680 | __skb_queue_tail(&list, skb); | |
7681 | } | |
7682 | fput(file); | |
7683 | file = NULL; | |
7684 | break; | |
7685 | } | |
7686 | ||
7687 | if (!file) | |
7688 | break; | |
7689 | ||
7690 | __skb_queue_tail(&list, skb); | |
7691 | ||
7692 | skb = skb_dequeue(head); | |
7693 | } | |
7694 | ||
7695 | if (skb_peek(&list)) { | |
7696 | spin_lock_irq(&head->lock); | |
7697 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7698 | __skb_queue_tail(head, skb); | |
7699 | spin_unlock_irq(&head->lock); | |
7700 | } | |
7701 | #else | |
7702 | fput(file); | |
7703 | #endif | |
7704 | } | |
7705 | ||
7706 | struct io_file_put { | |
05589553 | 7707 | struct list_head list; |
05f3fb3c | 7708 | struct file *file; |
05f3fb3c JA |
7709 | }; |
7710 | ||
4a38aed2 | 7711 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7712 | { |
4a38aed2 JA |
7713 | struct fixed_file_data *file_data = ref_node->file_data; |
7714 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7715 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7716 | |
7717 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7718 | list_del(&pfile->list); |
05589553 XW |
7719 | io_ring_file_put(ctx, pfile->file); |
7720 | kfree(pfile); | |
65e19f54 | 7721 | } |
05589553 | 7722 | |
05589553 XW |
7723 | percpu_ref_exit(&ref_node->refs); |
7724 | kfree(ref_node); | |
7725 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7726 | } |
65e19f54 | 7727 | |
4a38aed2 JA |
7728 | static void io_file_put_work(struct work_struct *work) |
7729 | { | |
7730 | struct io_ring_ctx *ctx; | |
7731 | struct llist_node *node; | |
7732 | ||
7733 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7734 | node = llist_del_all(&ctx->file_put_llist); | |
7735 | ||
7736 | while (node) { | |
7737 | struct fixed_file_ref_node *ref_node; | |
7738 | struct llist_node *next = node->next; | |
7739 | ||
7740 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7741 | __io_file_put_work(ref_node); | |
7742 | node = next; | |
7743 | } | |
7744 | } | |
7745 | ||
05589553 | 7746 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7747 | { |
05589553 | 7748 | struct fixed_file_ref_node *ref_node; |
e297822b | 7749 | struct fixed_file_data *data; |
4a38aed2 | 7750 | struct io_ring_ctx *ctx; |
e297822b | 7751 | bool first_add = false; |
4a38aed2 | 7752 | int delay = HZ; |
65e19f54 | 7753 | |
05589553 | 7754 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7755 | data = ref_node->file_data; |
7756 | ctx = data->ctx; | |
7757 | ||
ac0648a5 | 7758 | spin_lock_bh(&data->lock); |
e297822b PB |
7759 | ref_node->done = true; |
7760 | ||
7761 | while (!list_empty(&data->ref_list)) { | |
7762 | ref_node = list_first_entry(&data->ref_list, | |
7763 | struct fixed_file_ref_node, node); | |
7764 | /* recycle ref nodes in order */ | |
7765 | if (!ref_node->done) | |
7766 | break; | |
7767 | list_del(&ref_node->node); | |
7768 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7769 | } | |
ac0648a5 | 7770 | spin_unlock_bh(&data->lock); |
05589553 | 7771 | |
e297822b | 7772 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7773 | delay = 0; |
05589553 | 7774 | |
4a38aed2 JA |
7775 | if (!delay) |
7776 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7777 | else if (first_add) | |
7778 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7779 | } |
65e19f54 | 7780 | |
05589553 XW |
7781 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7782 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7783 | { |
05589553 | 7784 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7785 | |
05589553 XW |
7786 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7787 | if (!ref_node) | |
3e2224c5 | 7788 | return NULL; |
05f3fb3c | 7789 | |
05589553 XW |
7790 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7791 | 0, GFP_KERNEL)) { | |
7792 | kfree(ref_node); | |
3e2224c5 | 7793 | return NULL; |
05589553 XW |
7794 | } |
7795 | INIT_LIST_HEAD(&ref_node->node); | |
7796 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7797 | ref_node->file_data = ctx->file_data; |
e297822b | 7798 | ref_node->done = false; |
05589553 | 7799 | return ref_node; |
05589553 XW |
7800 | } |
7801 | ||
7802 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7803 | { | |
7804 | percpu_ref_exit(&ref_node->refs); | |
7805 | kfree(ref_node); | |
65e19f54 JA |
7806 | } |
7807 | ||
6b06314c JA |
7808 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7809 | unsigned nr_args) | |
7810 | { | |
7811 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7812 | unsigned nr_tables, i; |
05f3fb3c | 7813 | struct file *file; |
600cf3f8 | 7814 | int fd, ret = -ENOMEM; |
05589553 | 7815 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7816 | struct fixed_file_data *file_data; |
6b06314c | 7817 | |
05f3fb3c | 7818 | if (ctx->file_data) |
6b06314c JA |
7819 | return -EBUSY; |
7820 | if (!nr_args) | |
7821 | return -EINVAL; | |
7822 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7823 | return -EMFILE; | |
7824 | ||
5398ae69 PB |
7825 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7826 | if (!file_data) | |
05f3fb3c | 7827 | return -ENOMEM; |
5398ae69 PB |
7828 | file_data->ctx = ctx; |
7829 | init_completion(&file_data->done); | |
7830 | INIT_LIST_HEAD(&file_data->ref_list); | |
7831 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7832 | |
65e19f54 | 7833 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7834 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7835 | GFP_KERNEL); |
600cf3f8 PB |
7836 | if (!file_data->table) |
7837 | goto out_free; | |
05f3fb3c | 7838 | |
5398ae69 | 7839 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7840 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7841 | goto out_free; | |
6b06314c | 7842 | |
600cf3f8 PB |
7843 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7844 | goto out_ref; | |
55cbc256 | 7845 | ctx->file_data = file_data; |
65e19f54 | 7846 | |
08a45173 | 7847 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7848 | struct fixed_file_table *table; |
7849 | unsigned index; | |
7850 | ||
600cf3f8 PB |
7851 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7852 | ret = -EFAULT; | |
7853 | goto out_fput; | |
7854 | } | |
08a45173 | 7855 | /* allow sparse sets */ |
600cf3f8 | 7856 | if (fd == -1) |
08a45173 | 7857 | continue; |
6b06314c | 7858 | |
05f3fb3c | 7859 | file = fget(fd); |
6b06314c | 7860 | ret = -EBADF; |
05f3fb3c | 7861 | if (!file) |
600cf3f8 | 7862 | goto out_fput; |
05f3fb3c | 7863 | |
6b06314c JA |
7864 | /* |
7865 | * Don't allow io_uring instances to be registered. If UNIX | |
7866 | * isn't enabled, then this causes a reference cycle and this | |
7867 | * instance can never get freed. If UNIX is enabled we'll | |
7868 | * handle it just fine, but there's still no point in allowing | |
7869 | * a ring fd as it doesn't support regular read/write anyway. | |
7870 | */ | |
05f3fb3c JA |
7871 | if (file->f_op == &io_uring_fops) { |
7872 | fput(file); | |
600cf3f8 | 7873 | goto out_fput; |
6b06314c | 7874 | } |
600cf3f8 PB |
7875 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7876 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7877 | table->files[index] = file; |
6b06314c JA |
7878 | } |
7879 | ||
6b06314c | 7880 | ret = io_sqe_files_scm(ctx); |
05589553 | 7881 | if (ret) { |
6b06314c | 7882 | io_sqe_files_unregister(ctx); |
05589553 XW |
7883 | return ret; |
7884 | } | |
6b06314c | 7885 | |
05589553 | 7886 | ref_node = alloc_fixed_file_ref_node(ctx); |
3e2224c5 | 7887 | if (!ref_node) { |
05589553 | 7888 | io_sqe_files_unregister(ctx); |
3e2224c5 | 7889 | return -ENOMEM; |
05589553 XW |
7890 | } |
7891 | ||
1642b445 | 7892 | io_sqe_files_set_node(file_data, ref_node); |
6b06314c | 7893 | return ret; |
600cf3f8 PB |
7894 | out_fput: |
7895 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7896 | file = io_file_from_index(ctx, i); | |
7897 | if (file) | |
7898 | fput(file); | |
7899 | } | |
7900 | for (i = 0; i < nr_tables; i++) | |
7901 | kfree(file_data->table[i].files); | |
7902 | ctx->nr_user_files = 0; | |
7903 | out_ref: | |
7904 | percpu_ref_exit(&file_data->refs); | |
7905 | out_free: | |
7906 | kfree(file_data->table); | |
7907 | kfree(file_data); | |
55cbc256 | 7908 | ctx->file_data = NULL; |
6b06314c JA |
7909 | return ret; |
7910 | } | |
7911 | ||
c3a31e60 JA |
7912 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7913 | int index) | |
7914 | { | |
7915 | #if defined(CONFIG_UNIX) | |
7916 | struct sock *sock = ctx->ring_sock->sk; | |
7917 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7918 | struct sk_buff *skb; | |
7919 | ||
7920 | /* | |
7921 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7922 | * file set. If there's no room, fall back to allocating a new skb | |
7923 | * and filling it in. | |
7924 | */ | |
7925 | spin_lock_irq(&head->lock); | |
7926 | skb = skb_peek(head); | |
7927 | if (skb) { | |
7928 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7929 | ||
7930 | if (fpl->count < SCM_MAX_FD) { | |
7931 | __skb_unlink(skb, head); | |
7932 | spin_unlock_irq(&head->lock); | |
7933 | fpl->fp[fpl->count] = get_file(file); | |
7934 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7935 | fpl->count++; | |
7936 | spin_lock_irq(&head->lock); | |
7937 | __skb_queue_head(head, skb); | |
7938 | } else { | |
7939 | skb = NULL; | |
7940 | } | |
7941 | } | |
7942 | spin_unlock_irq(&head->lock); | |
7943 | ||
7944 | if (skb) { | |
7945 | fput(file); | |
7946 | return 0; | |
7947 | } | |
7948 | ||
7949 | return __io_sqe_files_scm(ctx, 1, index); | |
7950 | #else | |
7951 | return 0; | |
7952 | #endif | |
7953 | } | |
7954 | ||
a5318d3c | 7955 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7956 | struct file *file) |
05f3fb3c | 7957 | { |
a5318d3c | 7958 | struct io_file_put *pfile; |
b2e96852 | 7959 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7960 | |
05f3fb3c | 7961 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7962 | if (!pfile) |
7963 | return -ENOMEM; | |
05f3fb3c JA |
7964 | |
7965 | pfile->file = file; | |
05589553 XW |
7966 | list_add(&pfile->list, &ref_node->file_list); |
7967 | ||
a5318d3c | 7968 | return 0; |
05f3fb3c JA |
7969 | } |
7970 | ||
7971 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7972 | struct io_uring_files_update *up, | |
7973 | unsigned nr_args) | |
7974 | { | |
7975 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7976 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7977 | struct file *file; |
c3a31e60 JA |
7978 | __s32 __user *fds; |
7979 | int fd, i, err; | |
7980 | __u32 done; | |
05589553 | 7981 | bool needs_switch = false; |
c3a31e60 | 7982 | |
05f3fb3c | 7983 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7984 | return -EOVERFLOW; |
7985 | if (done > ctx->nr_user_files) | |
7986 | return -EINVAL; | |
7987 | ||
05589553 | 7988 | ref_node = alloc_fixed_file_ref_node(ctx); |
3e2224c5 MWO |
7989 | if (!ref_node) |
7990 | return -ENOMEM; | |
05589553 | 7991 | |
c3a31e60 | 7992 | done = 0; |
05f3fb3c | 7993 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7994 | while (nr_args) { |
65e19f54 JA |
7995 | struct fixed_file_table *table; |
7996 | unsigned index; | |
7997 | ||
c3a31e60 JA |
7998 | err = 0; |
7999 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
8000 | err = -EFAULT; | |
8001 | break; | |
8002 | } | |
05f3fb3c JA |
8003 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
8004 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
8005 | index = i & IORING_FILE_TABLE_MASK; |
8006 | if (table->files[index]) { | |
98dfd502 | 8007 | file = table->files[index]; |
a5318d3c HD |
8008 | err = io_queue_file_removal(data, file); |
8009 | if (err) | |
8010 | break; | |
65e19f54 | 8011 | table->files[index] = NULL; |
05589553 | 8012 | needs_switch = true; |
c3a31e60 JA |
8013 | } |
8014 | if (fd != -1) { | |
c3a31e60 JA |
8015 | file = fget(fd); |
8016 | if (!file) { | |
8017 | err = -EBADF; | |
8018 | break; | |
8019 | } | |
8020 | /* | |
8021 | * Don't allow io_uring instances to be registered. If | |
8022 | * UNIX isn't enabled, then this causes a reference | |
8023 | * cycle and this instance can never get freed. If UNIX | |
8024 | * is enabled we'll handle it just fine, but there's | |
8025 | * still no point in allowing a ring fd as it doesn't | |
8026 | * support regular read/write anyway. | |
8027 | */ | |
8028 | if (file->f_op == &io_uring_fops) { | |
8029 | fput(file); | |
8030 | err = -EBADF; | |
8031 | break; | |
8032 | } | |
65e19f54 | 8033 | table->files[index] = file; |
c3a31e60 | 8034 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8035 | if (err) { |
95d1c8e5 | 8036 | table->files[index] = NULL; |
f3bd9dae | 8037 | fput(file); |
c3a31e60 | 8038 | break; |
f3bd9dae | 8039 | } |
c3a31e60 JA |
8040 | } |
8041 | nr_args--; | |
8042 | done++; | |
05f3fb3c JA |
8043 | up->offset++; |
8044 | } | |
8045 | ||
05589553 | 8046 | if (needs_switch) { |
b2e96852 | 8047 | percpu_ref_kill(&data->node->refs); |
1642b445 | 8048 | io_sqe_files_set_node(data, ref_node); |
05589553 XW |
8049 | } else |
8050 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
8051 | |
8052 | return done ? done : err; | |
8053 | } | |
05589553 | 8054 | |
05f3fb3c JA |
8055 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
8056 | unsigned nr_args) | |
8057 | { | |
8058 | struct io_uring_files_update up; | |
8059 | ||
8060 | if (!ctx->file_data) | |
8061 | return -ENXIO; | |
8062 | if (!nr_args) | |
8063 | return -EINVAL; | |
8064 | if (copy_from_user(&up, arg, sizeof(up))) | |
8065 | return -EFAULT; | |
8066 | if (up.resv) | |
8067 | return -EINVAL; | |
8068 | ||
8069 | return __io_sqe_files_update(ctx, &up, nr_args); | |
8070 | } | |
c3a31e60 | 8071 | |
e9fd9396 | 8072 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
8073 | { |
8074 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8075 | ||
e9fd9396 | 8076 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
8077 | io_put_req(req); |
8078 | } | |
8079 | ||
24369c2e PB |
8080 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
8081 | struct io_uring_params *p) | |
8082 | { | |
8083 | struct io_wq_data data; | |
8084 | struct fd f; | |
8085 | struct io_ring_ctx *ctx_attach; | |
8086 | unsigned int concurrency; | |
8087 | int ret = 0; | |
8088 | ||
8089 | data.user = ctx->user; | |
e9fd9396 | 8090 | data.free_work = io_free_work; |
f5fa38c5 | 8091 | data.do_work = io_wq_submit_work; |
24369c2e PB |
8092 | |
8093 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
8094 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
8095 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
8096 | ||
8097 | ctx->io_wq = io_wq_create(concurrency, &data); | |
8098 | if (IS_ERR(ctx->io_wq)) { | |
8099 | ret = PTR_ERR(ctx->io_wq); | |
8100 | ctx->io_wq = NULL; | |
8101 | } | |
8102 | return ret; | |
8103 | } | |
8104 | ||
8105 | f = fdget(p->wq_fd); | |
8106 | if (!f.file) | |
8107 | return -EBADF; | |
8108 | ||
8109 | if (f.file->f_op != &io_uring_fops) { | |
8110 | ret = -EINVAL; | |
8111 | goto out_fput; | |
8112 | } | |
8113 | ||
8114 | ctx_attach = f.file->private_data; | |
8115 | /* @io_wq is protected by holding the fd */ | |
8116 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
8117 | ret = -EINVAL; | |
8118 | goto out_fput; | |
8119 | } | |
8120 | ||
8121 | ctx->io_wq = ctx_attach->io_wq; | |
8122 | out_fput: | |
8123 | fdput(f); | |
8124 | return ret; | |
8125 | } | |
8126 | ||
0f212204 JA |
8127 | static int io_uring_alloc_task_context(struct task_struct *task) |
8128 | { | |
8129 | struct io_uring_task *tctx; | |
d8a6df10 | 8130 | int ret; |
0f212204 JA |
8131 | |
8132 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
8133 | if (unlikely(!tctx)) | |
8134 | return -ENOMEM; | |
8135 | ||
d8a6df10 JA |
8136 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8137 | if (unlikely(ret)) { | |
8138 | kfree(tctx); | |
8139 | return ret; | |
8140 | } | |
8141 | ||
0f212204 JA |
8142 | xa_init(&tctx->xa); |
8143 | init_waitqueue_head(&tctx->wait); | |
8144 | tctx->last = NULL; | |
fdaf083c JA |
8145 | atomic_set(&tctx->in_idle, 0); |
8146 | tctx->sqpoll = false; | |
500a373d JA |
8147 | io_init_identity(&tctx->__identity); |
8148 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
8149 | task->io_uring = tctx; |
8150 | return 0; | |
8151 | } | |
8152 | ||
8153 | void __io_uring_free(struct task_struct *tsk) | |
8154 | { | |
8155 | struct io_uring_task *tctx = tsk->io_uring; | |
8156 | ||
8157 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8158 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8159 | if (tctx->identity != &tctx->__identity) | |
8160 | kfree(tctx->identity); | |
d8a6df10 | 8161 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8162 | kfree(tctx); |
8163 | tsk->io_uring = NULL; | |
8164 | } | |
8165 | ||
7e84e1c7 SG |
8166 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8167 | struct io_uring_params *p) | |
2b188cc1 JA |
8168 | { |
8169 | int ret; | |
8170 | ||
6c271ce2 | 8171 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8172 | struct io_sq_data *sqd; |
8173 | ||
3ec482d1 | 8174 | ret = -EPERM; |
ce59fc69 | 8175 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8176 | goto err; |
8177 | ||
534ca6d6 JA |
8178 | sqd = io_get_sq_data(p); |
8179 | if (IS_ERR(sqd)) { | |
8180 | ret = PTR_ERR(sqd); | |
8181 | goto err; | |
8182 | } | |
69fb2131 | 8183 | |
534ca6d6 | 8184 | ctx->sq_data = sqd; |
69fb2131 JA |
8185 | io_sq_thread_park(sqd); |
8186 | mutex_lock(&sqd->ctx_lock); | |
8187 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8188 | mutex_unlock(&sqd->ctx_lock); | |
8189 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8190 | |
917257da JA |
8191 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8192 | if (!ctx->sq_thread_idle) | |
8193 | ctx->sq_thread_idle = HZ; | |
8194 | ||
aa06165d JA |
8195 | if (sqd->thread) |
8196 | goto done; | |
8197 | ||
6c271ce2 | 8198 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8199 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8200 | |
917257da | 8201 | ret = -EINVAL; |
44a9bd18 JA |
8202 | if (cpu >= nr_cpu_ids) |
8203 | goto err; | |
7889f44d | 8204 | if (!cpu_online(cpu)) |
917257da JA |
8205 | goto err; |
8206 | ||
69fb2131 | 8207 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8208 | cpu, "io_uring-sq"); |
6c271ce2 | 8209 | } else { |
69fb2131 | 8210 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8211 | "io_uring-sq"); |
8212 | } | |
534ca6d6 JA |
8213 | if (IS_ERR(sqd->thread)) { |
8214 | ret = PTR_ERR(sqd->thread); | |
8215 | sqd->thread = NULL; | |
6c271ce2 JA |
8216 | goto err; |
8217 | } | |
534ca6d6 | 8218 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8219 | if (ret) |
8220 | goto err; | |
6c271ce2 JA |
8221 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8222 | /* Can't have SQ_AFF without SQPOLL */ | |
8223 | ret = -EINVAL; | |
8224 | goto err; | |
8225 | } | |
8226 | ||
aa06165d | 8227 | done: |
24369c2e PB |
8228 | ret = io_init_wq_offload(ctx, p); |
8229 | if (ret) | |
2b188cc1 | 8230 | goto err; |
2b188cc1 JA |
8231 | |
8232 | return 0; | |
8233 | err: | |
54a91f3b | 8234 | io_finish_async(ctx); |
2b188cc1 JA |
8235 | return ret; |
8236 | } | |
8237 | ||
7e84e1c7 SG |
8238 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8239 | { | |
534ca6d6 JA |
8240 | struct io_sq_data *sqd = ctx->sq_data; |
8241 | ||
8242 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8243 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8244 | } |
8245 | ||
a087e2b5 BM |
8246 | static inline void __io_unaccount_mem(struct user_struct *user, |
8247 | unsigned long nr_pages) | |
2b188cc1 JA |
8248 | { |
8249 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8250 | } | |
8251 | ||
a087e2b5 BM |
8252 | static inline int __io_account_mem(struct user_struct *user, |
8253 | unsigned long nr_pages) | |
2b188cc1 JA |
8254 | { |
8255 | unsigned long page_limit, cur_pages, new_pages; | |
8256 | ||
8257 | /* Don't allow more pages than we can safely lock */ | |
8258 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8259 | ||
8260 | do { | |
8261 | cur_pages = atomic_long_read(&user->locked_vm); | |
8262 | new_pages = cur_pages + nr_pages; | |
8263 | if (new_pages > page_limit) | |
8264 | return -ENOMEM; | |
8265 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8266 | new_pages) != cur_pages); | |
8267 | ||
8268 | return 0; | |
8269 | } | |
8270 | ||
2e0464d4 BM |
8271 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8272 | enum io_mem_account acct) | |
a087e2b5 | 8273 | { |
aad5d8da | 8274 | if (ctx->limit_mem) |
a087e2b5 | 8275 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8276 | |
2aede0e4 | 8277 | if (ctx->mm_account) { |
4bc4a912 JA |
8278 | if (acct == ACCT_LOCKED) { |
8279 | mmap_write_lock(ctx->mm_account); | |
2aede0e4 | 8280 | ctx->mm_account->locked_vm -= nr_pages; |
4bc4a912 JA |
8281 | mmap_write_unlock(ctx->mm_account); |
8282 | }else if (acct == ACCT_PINNED) { | |
2aede0e4 | 8283 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
4bc4a912 | 8284 | } |
2e0464d4 | 8285 | } |
a087e2b5 BM |
8286 | } |
8287 | ||
2e0464d4 BM |
8288 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8289 | enum io_mem_account acct) | |
a087e2b5 | 8290 | { |
30975825 BM |
8291 | int ret; |
8292 | ||
8293 | if (ctx->limit_mem) { | |
8294 | ret = __io_account_mem(ctx->user, nr_pages); | |
8295 | if (ret) | |
8296 | return ret; | |
8297 | } | |
8298 | ||
2aede0e4 | 8299 | if (ctx->mm_account) { |
4bc4a912 JA |
8300 | if (acct == ACCT_LOCKED) { |
8301 | mmap_write_lock(ctx->mm_account); | |
2aede0e4 | 8302 | ctx->mm_account->locked_vm += nr_pages; |
4bc4a912 JA |
8303 | mmap_write_unlock(ctx->mm_account); |
8304 | } else if (acct == ACCT_PINNED) { | |
2aede0e4 | 8305 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
4bc4a912 | 8306 | } |
2e0464d4 | 8307 | } |
a087e2b5 BM |
8308 | |
8309 | return 0; | |
8310 | } | |
8311 | ||
2b188cc1 JA |
8312 | static void io_mem_free(void *ptr) |
8313 | { | |
52e04ef4 MR |
8314 | struct page *page; |
8315 | ||
8316 | if (!ptr) | |
8317 | return; | |
2b188cc1 | 8318 | |
52e04ef4 | 8319 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8320 | if (put_page_testzero(page)) |
8321 | free_compound_page(page); | |
8322 | } | |
8323 | ||
8324 | static void *io_mem_alloc(size_t size) | |
8325 | { | |
8326 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8327 | __GFP_NORETRY; | |
8328 | ||
8329 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8330 | } | |
8331 | ||
75b28aff HV |
8332 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8333 | size_t *sq_offset) | |
8334 | { | |
8335 | struct io_rings *rings; | |
8336 | size_t off, sq_array_size; | |
8337 | ||
8338 | off = struct_size(rings, cqes, cq_entries); | |
8339 | if (off == SIZE_MAX) | |
8340 | return SIZE_MAX; | |
8341 | ||
8342 | #ifdef CONFIG_SMP | |
8343 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8344 | if (off == 0) | |
8345 | return SIZE_MAX; | |
8346 | #endif | |
8347 | ||
b36200f5 DV |
8348 | if (sq_offset) |
8349 | *sq_offset = off; | |
8350 | ||
75b28aff HV |
8351 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8352 | if (sq_array_size == SIZE_MAX) | |
8353 | return SIZE_MAX; | |
8354 | ||
8355 | if (check_add_overflow(off, sq_array_size, &off)) | |
8356 | return SIZE_MAX; | |
8357 | ||
75b28aff HV |
8358 | return off; |
8359 | } | |
8360 | ||
2b188cc1 JA |
8361 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8362 | { | |
75b28aff | 8363 | size_t pages; |
2b188cc1 | 8364 | |
75b28aff HV |
8365 | pages = (size_t)1 << get_order( |
8366 | rings_size(sq_entries, cq_entries, NULL)); | |
8367 | pages += (size_t)1 << get_order( | |
8368 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8369 | |
75b28aff | 8370 | return pages; |
2b188cc1 JA |
8371 | } |
8372 | ||
0a96bbe4 | 8373 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee JA |
8374 | { |
8375 | int i, j; | |
8376 | ||
8377 | if (!ctx->user_bufs) | |
8378 | return -ENXIO; | |
8379 | ||
8380 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8381 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8382 | ||
8383 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8384 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8385 | |
de293938 JA |
8386 | if (imu->acct_pages) |
8387 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8388 | kvfree(imu->bvec); |
edafccee JA |
8389 | imu->nr_bvecs = 0; |
8390 | } | |
8391 | ||
8392 | kfree(ctx->user_bufs); | |
8393 | ctx->user_bufs = NULL; | |
8394 | ctx->nr_user_bufs = 0; | |
8395 | return 0; | |
8396 | } | |
8397 | ||
8398 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8399 | void __user *arg, unsigned index) | |
8400 | { | |
8401 | struct iovec __user *src; | |
8402 | ||
8403 | #ifdef CONFIG_COMPAT | |
8404 | if (ctx->compat) { | |
8405 | struct compat_iovec __user *ciovs; | |
8406 | struct compat_iovec ciov; | |
8407 | ||
8408 | ciovs = (struct compat_iovec __user *) arg; | |
8409 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8410 | return -EFAULT; | |
8411 | ||
d55e5f5b | 8412 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8413 | dst->iov_len = ciov.iov_len; |
8414 | return 0; | |
8415 | } | |
8416 | #endif | |
8417 | src = (struct iovec __user *) arg; | |
8418 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8419 | return -EFAULT; | |
8420 | return 0; | |
8421 | } | |
8422 | ||
de293938 JA |
8423 | /* |
8424 | * Not super efficient, but this is just a registration time. And we do cache | |
8425 | * the last compound head, so generally we'll only do a full search if we don't | |
8426 | * match that one. | |
8427 | * | |
8428 | * We check if the given compound head page has already been accounted, to | |
8429 | * avoid double accounting it. This allows us to account the full size of the | |
8430 | * page, not just the constituent pages of a huge page. | |
8431 | */ | |
8432 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8433 | int nr_pages, struct page *hpage) | |
8434 | { | |
8435 | int i, j; | |
8436 | ||
8437 | /* check current page array */ | |
8438 | for (i = 0; i < nr_pages; i++) { | |
8439 | if (!PageCompound(pages[i])) | |
8440 | continue; | |
8441 | if (compound_head(pages[i]) == hpage) | |
8442 | return true; | |
8443 | } | |
8444 | ||
8445 | /* check previously registered pages */ | |
8446 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8447 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8448 | ||
8449 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8450 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8451 | continue; | |
8452 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8453 | return true; | |
8454 | } | |
8455 | } | |
8456 | ||
8457 | return false; | |
8458 | } | |
8459 | ||
8460 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8461 | int nr_pages, struct io_mapped_ubuf *imu, | |
8462 | struct page **last_hpage) | |
8463 | { | |
8464 | int i, ret; | |
8465 | ||
8466 | for (i = 0; i < nr_pages; i++) { | |
8467 | if (!PageCompound(pages[i])) { | |
8468 | imu->acct_pages++; | |
8469 | } else { | |
8470 | struct page *hpage; | |
8471 | ||
8472 | hpage = compound_head(pages[i]); | |
8473 | if (hpage == *last_hpage) | |
8474 | continue; | |
8475 | *last_hpage = hpage; | |
8476 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8477 | continue; | |
8478 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8479 | } | |
8480 | } | |
8481 | ||
8482 | if (!imu->acct_pages) | |
8483 | return 0; | |
8484 | ||
8485 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8486 | if (ret) | |
8487 | imu->acct_pages = 0; | |
8488 | return ret; | |
8489 | } | |
8490 | ||
0a96bbe4 BM |
8491 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
8492 | struct io_mapped_ubuf *imu, | |
8493 | struct page **last_hpage) | |
edafccee JA |
8494 | { |
8495 | struct vm_area_struct **vmas = NULL; | |
8496 | struct page **pages = NULL; | |
0a96bbe4 BM |
8497 | unsigned long off, start, end, ubuf; |
8498 | size_t size; | |
8499 | int ret, pret, nr_pages, i; | |
8500 | ||
8501 | ubuf = (unsigned long) iov->iov_base; | |
8502 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8503 | start = ubuf >> PAGE_SHIFT; | |
8504 | nr_pages = end - start; | |
8505 | ||
8506 | ret = -ENOMEM; | |
8507 | ||
8508 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8509 | if (!pages) | |
8510 | goto done; | |
8511 | ||
8512 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8513 | GFP_KERNEL); | |
8514 | if (!vmas) | |
8515 | goto done; | |
8516 | ||
8517 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), | |
8518 | GFP_KERNEL); | |
8519 | if (!imu->bvec) | |
8520 | goto done; | |
8521 | ||
8522 | ret = 0; | |
8523 | mmap_read_lock(current->mm); | |
8524 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8525 | pages, vmas); | |
8526 | if (pret == nr_pages) { | |
8527 | /* don't support file backed memory */ | |
8528 | for (i = 0; i < nr_pages; i++) { | |
8529 | struct vm_area_struct *vma = vmas[i]; | |
8530 | ||
8531 | if (vma->vm_file && | |
8532 | !is_file_hugepages(vma->vm_file)) { | |
8533 | ret = -EOPNOTSUPP; | |
8534 | break; | |
8535 | } | |
8536 | } | |
8537 | } else { | |
8538 | ret = pret < 0 ? pret : -EFAULT; | |
8539 | } | |
8540 | mmap_read_unlock(current->mm); | |
8541 | if (ret) { | |
8542 | /* | |
8543 | * if we did partial map, or found file backed vmas, | |
8544 | * release any pages we did get | |
8545 | */ | |
8546 | if (pret > 0) | |
8547 | unpin_user_pages(pages, pret); | |
8548 | kvfree(imu->bvec); | |
8549 | goto done; | |
8550 | } | |
8551 | ||
8552 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8553 | if (ret) { | |
8554 | unpin_user_pages(pages, pret); | |
8555 | kvfree(imu->bvec); | |
8556 | goto done; | |
8557 | } | |
8558 | ||
8559 | off = ubuf & ~PAGE_MASK; | |
8560 | size = iov->iov_len; | |
8561 | for (i = 0; i < nr_pages; i++) { | |
8562 | size_t vec_len; | |
8563 | ||
8564 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8565 | imu->bvec[i].bv_page = pages[i]; | |
8566 | imu->bvec[i].bv_len = vec_len; | |
8567 | imu->bvec[i].bv_offset = off; | |
8568 | off = 0; | |
8569 | size -= vec_len; | |
8570 | } | |
8571 | /* store original address for later verification */ | |
8572 | imu->ubuf = ubuf; | |
8573 | imu->len = iov->iov_len; | |
8574 | imu->nr_bvecs = nr_pages; | |
8575 | ret = 0; | |
8576 | done: | |
8577 | kvfree(pages); | |
8578 | kvfree(vmas); | |
8579 | return ret; | |
8580 | } | |
8581 | ||
8582 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
8583 | unsigned int nr_args) | |
8584 | { | |
8585 | int i, ret; | |
8586 | struct iovec iov; | |
de293938 | 8587 | struct page *last_hpage = NULL; |
edafccee JA |
8588 | |
8589 | if (ctx->user_bufs) | |
8590 | return -EBUSY; | |
8591 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8592 | return -EINVAL; | |
8593 | ||
8594 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8595 | GFP_KERNEL); | |
8596 | if (!ctx->user_bufs) | |
8597 | return -ENOMEM; | |
8598 | ||
8599 | for (i = 0; i < nr_args; i++) { | |
8600 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
edafccee JA |
8601 | |
8602 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8603 | if (ret) | |
0a96bbe4 | 8604 | break; |
edafccee JA |
8605 | |
8606 | /* | |
8607 | * Don't impose further limits on the size and buffer | |
8608 | * constraints here, we'll -EINVAL later when IO is | |
8609 | * submitted if they are wrong. | |
8610 | */ | |
8611 | ret = -EFAULT; | |
8612 | if (!iov.iov_base || !iov.iov_len) | |
0a96bbe4 | 8613 | break; |
edafccee JA |
8614 | |
8615 | /* arbitrary limit, but we need something */ | |
8616 | if (iov.iov_len > SZ_1G) | |
0a96bbe4 | 8617 | break; |
edafccee | 8618 | |
0a96bbe4 BM |
8619 | ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage); |
8620 | if (ret) | |
8621 | break; | |
edafccee JA |
8622 | |
8623 | ctx->nr_user_bufs++; | |
8624 | } | |
0a96bbe4 BM |
8625 | |
8626 | if (ret) | |
8627 | io_sqe_buffers_unregister(ctx); | |
8628 | ||
edafccee JA |
8629 | return ret; |
8630 | } | |
8631 | ||
9b402849 JA |
8632 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8633 | { | |
8634 | __s32 __user *fds = arg; | |
8635 | int fd; | |
8636 | ||
8637 | if (ctx->cq_ev_fd) | |
8638 | return -EBUSY; | |
8639 | ||
8640 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8641 | return -EFAULT; | |
8642 | ||
8643 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8644 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8645 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8646 | ctx->cq_ev_fd = NULL; | |
8647 | return ret; | |
8648 | } | |
8649 | ||
8650 | return 0; | |
8651 | } | |
8652 | ||
8653 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8654 | { | |
8655 | if (ctx->cq_ev_fd) { | |
8656 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8657 | ctx->cq_ev_fd = NULL; | |
8658 | return 0; | |
8659 | } | |
8660 | ||
8661 | return -ENXIO; | |
8662 | } | |
8663 | ||
5a2e745d JA |
8664 | static int __io_destroy_buffers(int id, void *p, void *data) |
8665 | { | |
8666 | struct io_ring_ctx *ctx = data; | |
8667 | struct io_buffer *buf = p; | |
8668 | ||
067524e9 | 8669 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8670 | return 0; |
8671 | } | |
8672 | ||
8673 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8674 | { | |
8675 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8676 | idr_destroy(&ctx->io_buffer_idr); | |
8677 | } | |
8678 | ||
2b188cc1 JA |
8679 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8680 | { | |
6b06314c | 8681 | io_finish_async(ctx); |
0a96bbe4 | 8682 | io_sqe_buffers_unregister(ctx); |
2aede0e4 JA |
8683 | |
8684 | if (ctx->sqo_task) { | |
8685 | put_task_struct(ctx->sqo_task); | |
8686 | ctx->sqo_task = NULL; | |
8687 | mmdrop(ctx->mm_account); | |
8688 | ctx->mm_account = NULL; | |
30975825 | 8689 | } |
def596e9 | 8690 | |
91d8f519 DZ |
8691 | #ifdef CONFIG_BLK_CGROUP |
8692 | if (ctx->sqo_blkcg_css) | |
8693 | css_put(ctx->sqo_blkcg_css); | |
8694 | #endif | |
8695 | ||
6b06314c | 8696 | io_sqe_files_unregister(ctx); |
9b402849 | 8697 | io_eventfd_unregister(ctx); |
5a2e745d | 8698 | io_destroy_buffers(ctx); |
41726c9a | 8699 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8700 | |
2b188cc1 | 8701 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8702 | if (ctx->ring_sock) { |
8703 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8704 | sock_release(ctx->ring_sock); |
355e8d26 | 8705 | } |
2b188cc1 JA |
8706 | #endif |
8707 | ||
75b28aff | 8708 | io_mem_free(ctx->rings); |
2b188cc1 | 8709 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8710 | |
8711 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8712 | free_uid(ctx->user); |
181e448d | 8713 | put_cred(ctx->creds); |
78076bb6 | 8714 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8715 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8716 | kfree(ctx); |
8717 | } | |
8718 | ||
8719 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8720 | { | |
8721 | struct io_ring_ctx *ctx = file->private_data; | |
8722 | __poll_t mask = 0; | |
8723 | ||
8724 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8725 | /* |
8726 | * synchronizes with barrier from wq_has_sleeper call in | |
8727 | * io_commit_cqring | |
8728 | */ | |
2b188cc1 | 8729 | smp_rmb(); |
90554200 | 8730 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8731 | mask |= EPOLLOUT | EPOLLWRNORM; |
6c503150 PB |
8732 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
8733 | if (io_cqring_events(ctx)) | |
2b188cc1 JA |
8734 | mask |= EPOLLIN | EPOLLRDNORM; |
8735 | ||
8736 | return mask; | |
8737 | } | |
8738 | ||
8739 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8740 | { | |
8741 | struct io_ring_ctx *ctx = file->private_data; | |
8742 | ||
8743 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8744 | } | |
8745 | ||
071698e1 JA |
8746 | static int io_remove_personalities(int id, void *p, void *data) |
8747 | { | |
8748 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8749 | struct io_identity *iod; |
071698e1 | 8750 | |
1e6fa521 JA |
8751 | iod = idr_remove(&ctx->personality_idr, id); |
8752 | if (iod) { | |
8753 | put_cred(iod->creds); | |
8754 | if (refcount_dec_and_test(&iod->count)) | |
8755 | kfree(iod); | |
8756 | } | |
071698e1 JA |
8757 | return 0; |
8758 | } | |
8759 | ||
85faa7b8 JA |
8760 | static void io_ring_exit_work(struct work_struct *work) |
8761 | { | |
b2edc0a7 PB |
8762 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8763 | exit_work); | |
85faa7b8 | 8764 | |
56952e91 JA |
8765 | /* |
8766 | * If we're doing polled IO and end up having requests being | |
8767 | * submitted async (out-of-line), then completions can come in while | |
8768 | * we're waiting for refs to drop. We need to reap these manually, | |
8769 | * as nobody else will be looking for them. | |
8770 | */ | |
b2edc0a7 | 8771 | do { |
90df0853 | 8772 | __io_uring_cancel_task_requests(ctx, NULL); |
b2edc0a7 | 8773 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
85faa7b8 JA |
8774 | io_ring_ctx_free(ctx); |
8775 | } | |
8776 | ||
00c18640 JA |
8777 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8778 | { | |
8779 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8780 | ||
8781 | return req->ctx == data; | |
8782 | } | |
8783 | ||
2b188cc1 JA |
8784 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8785 | { | |
8786 | mutex_lock(&ctx->uring_lock); | |
8787 | percpu_ref_kill(&ctx->refs); | |
d9d05217 PB |
8788 | |
8789 | if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead)) | |
8790 | ctx->sqo_dead = 1; | |
8791 | ||
cda286f0 PB |
8792 | /* if force is set, the ring is going away. always drop after that */ |
8793 | ctx->cq_overflow_flushed = 1; | |
634578f8 | 8794 | if (ctx->rings) |
6c503150 | 8795 | __io_cqring_overflow_flush(ctx, true, NULL, NULL); |
2b188cc1 JA |
8796 | mutex_unlock(&ctx->uring_lock); |
8797 | ||
6b81928d PB |
8798 | io_kill_timeouts(ctx, NULL, NULL); |
8799 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8800 | |
8801 | if (ctx->io_wq) | |
00c18640 | 8802 | io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true); |
561fb04a | 8803 | |
15dff286 | 8804 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8805 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8806 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8807 | |
8808 | /* | |
8809 | * Do this upfront, so we won't have a grace period where the ring | |
8810 | * is closed but resources aren't reaped yet. This can cause | |
8811 | * spurious failure in setting up a new ring. | |
8812 | */ | |
760618f7 JA |
8813 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8814 | ACCT_LOCKED); | |
309fc03a | 8815 | |
85faa7b8 | 8816 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8817 | /* |
8818 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8819 | * if we're exiting a ton of rings at the same time. It just adds | |
8820 | * noise and overhead, there's no discernable change in runtime | |
8821 | * over using system_wq. | |
8822 | */ | |
8823 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8824 | } |
8825 | ||
8826 | static int io_uring_release(struct inode *inode, struct file *file) | |
8827 | { | |
8828 | struct io_ring_ctx *ctx = file->private_data; | |
8829 | ||
8830 | file->private_data = NULL; | |
8831 | io_ring_ctx_wait_and_kill(ctx); | |
8832 | return 0; | |
8833 | } | |
8834 | ||
f6edbabb PB |
8835 | struct io_task_cancel { |
8836 | struct task_struct *task; | |
8837 | struct files_struct *files; | |
8838 | }; | |
f254ac04 | 8839 | |
f6edbabb | 8840 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8841 | { |
9a472ef7 | 8842 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8843 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8844 | bool ret; |
8845 | ||
f6edbabb | 8846 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8847 | unsigned long flags; |
8848 | struct io_ring_ctx *ctx = req->ctx; | |
8849 | ||
8850 | /* protect against races with linked timeouts */ | |
8851 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8852 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8853 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8854 | } else { | |
f6edbabb | 8855 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8856 | } |
8857 | return ret; | |
b711d4ea JA |
8858 | } |
8859 | ||
b7ddce3c | 8860 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8861 | struct task_struct *task, |
b7ddce3c PB |
8862 | struct files_struct *files) |
8863 | { | |
8864 | struct io_defer_entry *de = NULL; | |
8865 | LIST_HEAD(list); | |
8866 | ||
8867 | spin_lock_irq(&ctx->completion_lock); | |
8868 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8869 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8870 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8871 | break; | |
8872 | } | |
8873 | } | |
8874 | spin_unlock_irq(&ctx->completion_lock); | |
8875 | ||
8876 | while (!list_empty(&list)) { | |
8877 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8878 | list_del_init(&de->list); | |
8879 | req_set_fail_links(de->req); | |
8880 | io_put_req(de->req); | |
8881 | io_req_complete(de->req, -ECANCELED); | |
8882 | kfree(de); | |
8883 | } | |
8884 | } | |
8885 | ||
ca70f00b PB |
8886 | static int io_uring_count_inflight(struct io_ring_ctx *ctx, |
8887 | struct task_struct *task, | |
8888 | struct files_struct *files) | |
8889 | { | |
8890 | struct io_kiocb *req; | |
8891 | int cnt = 0; | |
8892 | ||
8893 | spin_lock_irq(&ctx->inflight_lock); | |
8894 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) | |
8895 | cnt += io_match_task(req, task, files); | |
8896 | spin_unlock_irq(&ctx->inflight_lock); | |
8897 | return cnt; | |
8898 | } | |
8899 | ||
b52fda00 | 8900 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8901 | struct task_struct *task, |
fcb323cc JA |
8902 | struct files_struct *files) |
8903 | { | |
fcb323cc | 8904 | while (!list_empty_careful(&ctx->inflight_list)) { |
bee749b1 | 8905 | struct io_task_cancel cancel = { .task = task, .files = files }; |
d8f1b971 | 8906 | DEFINE_WAIT(wait); |
ca70f00b | 8907 | int inflight; |
fcb323cc | 8908 | |
ca70f00b PB |
8909 | inflight = io_uring_count_inflight(ctx, task, files); |
8910 | if (!inflight) | |
fcb323cc | 8911 | break; |
f6edbabb PB |
8912 | |
8913 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); | |
8914 | io_poll_remove_all(ctx, task, files); | |
8915 | io_kill_timeouts(ctx, task, files); | |
9d5c8190 | 8916 | io_cqring_overflow_flush(ctx, true, task, files); |
6200b0ae JA |
8917 | /* cancellations _may_ trigger task work */ |
8918 | io_run_task_work(); | |
ca70f00b PB |
8919 | |
8920 | prepare_to_wait(&task->io_uring->wait, &wait, | |
8921 | TASK_UNINTERRUPTIBLE); | |
8922 | if (inflight == io_uring_count_inflight(ctx, task, files)) | |
8923 | schedule(); | |
c98de08c | 8924 | finish_wait(&task->io_uring->wait, &wait); |
fcb323cc | 8925 | } |
44e728b8 PB |
8926 | } |
8927 | ||
b52fda00 PB |
8928 | static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8929 | struct task_struct *task) | |
0f212204 | 8930 | { |
b52fda00 | 8931 | while (1) { |
f6edbabb | 8932 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
0f212204 | 8933 | enum io_wq_cancel cret; |
b52fda00 | 8934 | bool ret = false; |
0f212204 | 8935 | |
90df0853 PB |
8936 | if (ctx->io_wq) { |
8937 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, | |
8938 | &cancel, true); | |
8939 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8940 | } | |
0f212204 JA |
8941 | |
8942 | /* SQPOLL thread does its own polling */ | |
8943 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8944 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8945 | io_iopoll_try_reap_events(ctx); | |
8946 | ret = true; | |
8947 | } | |
8948 | } | |
8949 | ||
6b81928d PB |
8950 | ret |= io_poll_remove_all(ctx, task, NULL); |
8951 | ret |= io_kill_timeouts(ctx, task, NULL); | |
55583d72 | 8952 | ret |= io_run_task_work(); |
b52fda00 PB |
8953 | if (!ret) |
8954 | break; | |
b52fda00 | 8955 | cond_resched(); |
0f212204 | 8956 | } |
0f212204 JA |
8957 | } |
8958 | ||
d9d05217 PB |
8959 | static void io_disable_sqo_submit(struct io_ring_ctx *ctx) |
8960 | { | |
d9d05217 PB |
8961 | mutex_lock(&ctx->uring_lock); |
8962 | ctx->sqo_dead = 1; | |
8963 | mutex_unlock(&ctx->uring_lock); | |
8964 | ||
8965 | /* make sure callers enter the ring to get error */ | |
b4411616 PB |
8966 | if (ctx->rings) |
8967 | io_ring_set_wakeup_flag(ctx); | |
d9d05217 PB |
8968 | } |
8969 | ||
0f212204 JA |
8970 | /* |
8971 | * We need to iteratively cancel requests, in case a request has dependent | |
8972 | * hard links. These persist even for failure of cancelations, hence keep | |
8973 | * looping until none are found. | |
8974 | */ | |
8975 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8976 | struct files_struct *files) | |
8977 | { | |
8978 | struct task_struct *task = current; | |
8979 | ||
fdaf083c | 8980 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
d9d05217 | 8981 | io_disable_sqo_submit(ctx); |
534ca6d6 | 8982 | task = ctx->sq_data->thread; |
fdaf083c JA |
8983 | atomic_inc(&task->io_uring->in_idle); |
8984 | io_sq_thread_park(ctx->sq_data); | |
8985 | } | |
0f212204 | 8986 | |
df9923f9 | 8987 | io_cancel_defer_files(ctx, task, files); |
0f212204 JA |
8988 | io_cqring_overflow_flush(ctx, true, task, files); |
8989 | ||
3a7efd1a | 8990 | io_uring_cancel_files(ctx, task, files); |
b52fda00 PB |
8991 | if (!files) |
8992 | __io_uring_cancel_task_requests(ctx, task); | |
fdaf083c JA |
8993 | |
8994 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8995 | atomic_dec(&task->io_uring->in_idle); | |
8996 | /* | |
8997 | * If the files that are going away are the ones in the thread | |
8998 | * identity, clear them out. | |
8999 | */ | |
9000 | if (task->io_uring->identity->files == files) | |
9001 | task->io_uring->identity->files = NULL; | |
9002 | io_sq_thread_unpark(ctx->sq_data); | |
9003 | } | |
0f212204 JA |
9004 | } |
9005 | ||
9006 | /* | |
9007 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9008 | */ | |
fdaf083c | 9009 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 9010 | { |
236434c3 | 9011 | struct io_uring_task *tctx = current->io_uring; |
a528b04e | 9012 | int ret; |
236434c3 MWO |
9013 | |
9014 | if (unlikely(!tctx)) { | |
0f212204 JA |
9015 | ret = io_uring_alloc_task_context(current); |
9016 | if (unlikely(ret)) | |
9017 | return ret; | |
236434c3 | 9018 | tctx = current->io_uring; |
0f212204 | 9019 | } |
236434c3 MWO |
9020 | if (tctx->last != file) { |
9021 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 9022 | |
236434c3 | 9023 | if (!old) { |
0f212204 | 9024 | get_file(file); |
a528b04e PB |
9025 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)file, |
9026 | file, GFP_KERNEL)); | |
9027 | if (ret) { | |
9028 | fput(file); | |
9029 | return ret; | |
9030 | } | |
0f212204 | 9031 | } |
236434c3 | 9032 | tctx->last = file; |
0f212204 JA |
9033 | } |
9034 | ||
fdaf083c JA |
9035 | /* |
9036 | * This is race safe in that the task itself is doing this, hence it | |
9037 | * cannot be going through the exit/cancel paths at the same time. | |
9038 | * This cannot be modified while exit/cancel is running. | |
9039 | */ | |
9040 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
9041 | tctx->sqpoll = true; | |
9042 | ||
0f212204 JA |
9043 | return 0; |
9044 | } | |
9045 | ||
9046 | /* | |
9047 | * Remove this io_uring_file -> task mapping. | |
9048 | */ | |
9049 | static void io_uring_del_task_file(struct file *file) | |
9050 | { | |
9051 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
9052 | |
9053 | if (tctx->last == file) | |
9054 | tctx->last = NULL; | |
5e2ed8c4 | 9055 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
9056 | if (file) |
9057 | fput(file); | |
9058 | } | |
9059 | ||
de7f1d9e PB |
9060 | static void io_uring_remove_task_files(struct io_uring_task *tctx) |
9061 | { | |
9062 | struct file *file; | |
9063 | unsigned long index; | |
9064 | ||
9065 | xa_for_each(&tctx->xa, index, file) | |
9066 | io_uring_del_task_file(file); | |
9067 | } | |
9068 | ||
0f212204 JA |
9069 | void __io_uring_files_cancel(struct files_struct *files) |
9070 | { | |
9071 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
9072 | struct file *file; |
9073 | unsigned long index; | |
0f212204 JA |
9074 | |
9075 | /* make sure overflow events are dropped */ | |
fdaf083c | 9076 | atomic_inc(&tctx->in_idle); |
de7f1d9e PB |
9077 | xa_for_each(&tctx->xa, index, file) |
9078 | io_uring_cancel_task_requests(file->private_data, files); | |
fdaf083c | 9079 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9080 | |
9081 | if (files) | |
9082 | io_uring_remove_task_files(tctx); | |
fdaf083c JA |
9083 | } |
9084 | ||
9085 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
9086 | { | |
9087 | unsigned long index; | |
9088 | struct file *file; | |
9089 | s64 inflight; | |
9090 | ||
9091 | inflight = percpu_counter_sum(&tctx->inflight); | |
9092 | if (!tctx->sqpoll) | |
9093 | return inflight; | |
9094 | ||
9095 | /* | |
9096 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
9097 | * add the pending count for those. | |
9098 | */ | |
9099 | xa_for_each(&tctx->xa, index, file) { | |
9100 | struct io_ring_ctx *ctx = file->private_data; | |
9101 | ||
9102 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
9103 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
9104 | ||
9105 | inflight += percpu_counter_sum(&__tctx->inflight); | |
9106 | } | |
9107 | } | |
9108 | ||
9109 | return inflight; | |
0f212204 JA |
9110 | } |
9111 | ||
0f212204 JA |
9112 | /* |
9113 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
9114 | * requests. | |
9115 | */ | |
9116 | void __io_uring_task_cancel(void) | |
9117 | { | |
9118 | struct io_uring_task *tctx = current->io_uring; | |
9119 | DEFINE_WAIT(wait); | |
d8a6df10 | 9120 | s64 inflight; |
0f212204 JA |
9121 | |
9122 | /* make sure overflow events are dropped */ | |
fdaf083c | 9123 | atomic_inc(&tctx->in_idle); |
0f212204 | 9124 | |
0b5cd6c3 PB |
9125 | /* trigger io_disable_sqo_submit() */ |
9126 | if (tctx->sqpoll) | |
9127 | __io_uring_files_cancel(NULL); | |
9128 | ||
d8a6df10 | 9129 | do { |
0f212204 | 9130 | /* read completions before cancelations */ |
fdaf083c | 9131 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9132 | if (!inflight) |
9133 | break; | |
0f212204 JA |
9134 | __io_uring_files_cancel(NULL); |
9135 | ||
9136 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9137 | ||
9138 | /* | |
a1bb3cd5 PB |
9139 | * If we've seen completions, retry without waiting. This |
9140 | * avoids a race where a completion comes in before we did | |
9141 | * prepare_to_wait(). | |
0f212204 | 9142 | */ |
a1bb3cd5 PB |
9143 | if (inflight == tctx_inflight(tctx)) |
9144 | schedule(); | |
f57555ed | 9145 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9146 | } while (1); |
0f212204 | 9147 | |
fdaf083c | 9148 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9149 | |
9150 | io_uring_remove_task_files(tctx); | |
44e728b8 PB |
9151 | } |
9152 | ||
fcb323cc JA |
9153 | static int io_uring_flush(struct file *file, void *data) |
9154 | { | |
6b5733eb | 9155 | struct io_uring_task *tctx = current->io_uring; |
d9d05217 | 9156 | struct io_ring_ctx *ctx = file->private_data; |
6b5733eb | 9157 | |
84965ff8 JA |
9158 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
9159 | io_uring_cancel_task_requests(ctx, NULL); | |
9160 | ||
6b5733eb | 9161 | if (!tctx) |
4f793dc4 PB |
9162 | return 0; |
9163 | ||
6b5733eb PB |
9164 | /* we should have cancelled and erased it before PF_EXITING */ |
9165 | WARN_ON_ONCE((current->flags & PF_EXITING) && | |
9166 | xa_load(&tctx->xa, (unsigned long)file)); | |
9167 | ||
4f793dc4 PB |
9168 | /* |
9169 | * fput() is pending, will be 2 if the only other ref is our potential | |
9170 | * task file note. If the task is exiting, drop regardless of count. | |
9171 | */ | |
6b5733eb PB |
9172 | if (atomic_long_read(&file->f_count) != 2) |
9173 | return 0; | |
4f793dc4 | 9174 | |
d9d05217 PB |
9175 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
9176 | /* there is only one file note, which is owned by sqo_task */ | |
4325cb49 PB |
9177 | WARN_ON_ONCE(ctx->sqo_task != current && |
9178 | xa_load(&tctx->xa, (unsigned long)file)); | |
9179 | /* sqo_dead check is for when this happens after cancellation */ | |
9180 | WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead && | |
d9d05217 PB |
9181 | !xa_load(&tctx->xa, (unsigned long)file)); |
9182 | ||
9183 | io_disable_sqo_submit(ctx); | |
9184 | } | |
9185 | ||
9186 | if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current) | |
9187 | io_uring_del_task_file(file); | |
fcb323cc JA |
9188 | return 0; |
9189 | } | |
9190 | ||
6c5c240e RP |
9191 | static void *io_uring_validate_mmap_request(struct file *file, |
9192 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9193 | { |
2b188cc1 | 9194 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9195 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9196 | struct page *page; |
9197 | void *ptr; | |
9198 | ||
9199 | switch (offset) { | |
9200 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9201 | case IORING_OFF_CQ_RING: |
9202 | ptr = ctx->rings; | |
2b188cc1 JA |
9203 | break; |
9204 | case IORING_OFF_SQES: | |
9205 | ptr = ctx->sq_sqes; | |
9206 | break; | |
2b188cc1 | 9207 | default: |
6c5c240e | 9208 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9209 | } |
9210 | ||
9211 | page = virt_to_head_page(ptr); | |
a50b854e | 9212 | if (sz > page_size(page)) |
6c5c240e RP |
9213 | return ERR_PTR(-EINVAL); |
9214 | ||
9215 | return ptr; | |
9216 | } | |
9217 | ||
9218 | #ifdef CONFIG_MMU | |
9219 | ||
9220 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9221 | { | |
9222 | size_t sz = vma->vm_end - vma->vm_start; | |
9223 | unsigned long pfn; | |
9224 | void *ptr; | |
9225 | ||
9226 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9227 | if (IS_ERR(ptr)) | |
9228 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9229 | |
9230 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9231 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9232 | } | |
9233 | ||
6c5c240e RP |
9234 | #else /* !CONFIG_MMU */ |
9235 | ||
9236 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9237 | { | |
9238 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9239 | } | |
9240 | ||
9241 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9242 | { | |
9243 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9244 | } | |
9245 | ||
9246 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9247 | unsigned long addr, unsigned long len, | |
9248 | unsigned long pgoff, unsigned long flags) | |
9249 | { | |
9250 | void *ptr; | |
9251 | ||
9252 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9253 | if (IS_ERR(ptr)) | |
9254 | return PTR_ERR(ptr); | |
9255 | ||
9256 | return (unsigned long) ptr; | |
9257 | } | |
9258 | ||
9259 | #endif /* !CONFIG_MMU */ | |
9260 | ||
d9d05217 | 9261 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 | 9262 | { |
d9d05217 | 9263 | int ret = 0; |
90554200 JA |
9264 | DEFINE_WAIT(wait); |
9265 | ||
9266 | do { | |
9267 | if (!io_sqring_full(ctx)) | |
9268 | break; | |
9269 | ||
9270 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9271 | ||
d9d05217 PB |
9272 | if (unlikely(ctx->sqo_dead)) { |
9273 | ret = -EOWNERDEAD; | |
9274 | goto out; | |
9275 | } | |
9276 | ||
90554200 JA |
9277 | if (!io_sqring_full(ctx)) |
9278 | break; | |
9279 | ||
9280 | schedule(); | |
9281 | } while (!signal_pending(current)); | |
9282 | ||
9283 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
d9d05217 PB |
9284 | out: |
9285 | return ret; | |
90554200 JA |
9286 | } |
9287 | ||
c73ebb68 HX |
9288 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9289 | struct __kernel_timespec __user **ts, | |
9290 | const sigset_t __user **sig) | |
9291 | { | |
9292 | struct io_uring_getevents_arg arg; | |
9293 | ||
9294 | /* | |
9295 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9296 | * is just a pointer to the sigset_t. | |
9297 | */ | |
9298 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9299 | *sig = (const sigset_t __user *) argp; | |
9300 | *ts = NULL; | |
9301 | return 0; | |
9302 | } | |
9303 | ||
9304 | /* | |
9305 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9306 | * timespec and sigset_t pointers if good. | |
9307 | */ | |
9308 | if (*argsz != sizeof(arg)) | |
9309 | return -EINVAL; | |
9310 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9311 | return -EFAULT; | |
9312 | *sig = u64_to_user_ptr(arg.sigmask); | |
9313 | *argsz = arg.sigmask_sz; | |
9314 | *ts = u64_to_user_ptr(arg.ts); | |
9315 | return 0; | |
9316 | } | |
9317 | ||
2b188cc1 | 9318 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9319 | u32, min_complete, u32, flags, const void __user *, argp, |
9320 | size_t, argsz) | |
2b188cc1 JA |
9321 | { |
9322 | struct io_ring_ctx *ctx; | |
9323 | long ret = -EBADF; | |
9324 | int submitted = 0; | |
9325 | struct fd f; | |
9326 | ||
4c6e277c | 9327 | io_run_task_work(); |
b41e9852 | 9328 | |
90554200 | 9329 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9330 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9331 | return -EINVAL; |
9332 | ||
9333 | f = fdget(fd); | |
9334 | if (!f.file) | |
9335 | return -EBADF; | |
9336 | ||
9337 | ret = -EOPNOTSUPP; | |
9338 | if (f.file->f_op != &io_uring_fops) | |
9339 | goto out_fput; | |
9340 | ||
9341 | ret = -ENXIO; | |
9342 | ctx = f.file->private_data; | |
9343 | if (!percpu_ref_tryget(&ctx->refs)) | |
9344 | goto out_fput; | |
9345 | ||
7e84e1c7 SG |
9346 | ret = -EBADFD; |
9347 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9348 | goto out; | |
9349 | ||
6c271ce2 JA |
9350 | /* |
9351 | * For SQ polling, the thread will do all submissions and completions. | |
9352 | * Just return the requested submit count, and wake the thread if | |
9353 | * we were asked to. | |
9354 | */ | |
b2a9eada | 9355 | ret = 0; |
6c271ce2 | 9356 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c503150 | 9357 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
89448c47 | 9358 | |
d9d05217 PB |
9359 | ret = -EOWNERDEAD; |
9360 | if (unlikely(ctx->sqo_dead)) | |
9361 | goto out; | |
6c271ce2 | 9362 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9363 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9364 | if (flags & IORING_ENTER_SQ_WAIT) { |
9365 | ret = io_sqpoll_wait_sq(ctx); | |
9366 | if (ret) | |
9367 | goto out; | |
9368 | } | |
6c271ce2 | 9369 | submitted = to_submit; |
b2a9eada | 9370 | } else if (to_submit) { |
fdaf083c | 9371 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9372 | if (unlikely(ret)) |
9373 | goto out; | |
2b188cc1 | 9374 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9375 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9376 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9377 | |
9378 | if (submitted != to_submit) | |
9379 | goto out; | |
2b188cc1 JA |
9380 | } |
9381 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9382 | const sigset_t __user *sig; |
9383 | struct __kernel_timespec __user *ts; | |
9384 | ||
9385 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9386 | if (unlikely(ret)) | |
9387 | goto out; | |
9388 | ||
2b188cc1 JA |
9389 | min_complete = min(min_complete, ctx->cq_entries); |
9390 | ||
32b2244a XW |
9391 | /* |
9392 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9393 | * space applications don't need to do io completion events | |
9394 | * polling again, they can rely on io_sq_thread to do polling | |
9395 | * work, which can reduce cpu usage and uring_lock contention. | |
9396 | */ | |
9397 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9398 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9399 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9400 | } else { |
c73ebb68 | 9401 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9402 | } |
2b188cc1 JA |
9403 | } |
9404 | ||
7c504e65 | 9405 | out: |
6805b32e | 9406 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9407 | out_fput: |
9408 | fdput(f); | |
9409 | return submitted ? submitted : ret; | |
9410 | } | |
9411 | ||
bebdb65e | 9412 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9413 | static int io_uring_show_cred(int id, void *p, void *data) |
9414 | { | |
6b47ab81 JA |
9415 | struct io_identity *iod = p; |
9416 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9417 | struct seq_file *m = data; |
9418 | struct user_namespace *uns = seq_user_ns(m); | |
9419 | struct group_info *gi; | |
9420 | kernel_cap_t cap; | |
9421 | unsigned __capi; | |
9422 | int g; | |
9423 | ||
9424 | seq_printf(m, "%5d\n", id); | |
9425 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9426 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9427 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9428 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9429 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9430 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9431 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9432 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9433 | seq_puts(m, "\n\tGroups:\t"); | |
9434 | gi = cred->group_info; | |
9435 | for (g = 0; g < gi->ngroups; g++) { | |
9436 | seq_put_decimal_ull(m, g ? " " : "", | |
9437 | from_kgid_munged(uns, gi->gid[g])); | |
9438 | } | |
9439 | seq_puts(m, "\n\tCapEff:\t"); | |
9440 | cap = cred->cap_effective; | |
9441 | CAP_FOR_EACH_U32(__capi) | |
9442 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9443 | seq_putc(m, '\n'); | |
9444 | return 0; | |
9445 | } | |
9446 | ||
9447 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9448 | { | |
dbbe9c64 | 9449 | struct io_sq_data *sq = NULL; |
fad8e0de | 9450 | bool has_lock; |
87ce955b JA |
9451 | int i; |
9452 | ||
fad8e0de JA |
9453 | /* |
9454 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9455 | * since fdinfo case grabs it in the opposite direction of normal use | |
9456 | * cases. If we fail to get the lock, we just don't iterate any | |
9457 | * structures that could be going away outside the io_uring mutex. | |
9458 | */ | |
9459 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9460 | ||
dbbe9c64 JQ |
9461 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9462 | sq = ctx->sq_data; | |
9463 | ||
9464 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9465 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9466 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9467 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9468 | struct fixed_file_table *table; |
9469 | struct file *f; | |
9470 | ||
9471 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9472 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9473 | if (f) | |
9474 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9475 | else | |
9476 | seq_printf(m, "%5u: <none>\n", i); | |
9477 | } | |
9478 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9479 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9480 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9481 | ||
9482 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9483 | (unsigned int) buf->len); | |
9484 | } | |
fad8e0de | 9485 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9486 | seq_printf(m, "Personalities:\n"); |
9487 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9488 | } | |
d7718a9d JA |
9489 | seq_printf(m, "PollList:\n"); |
9490 | spin_lock_irq(&ctx->completion_lock); | |
9491 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9492 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9493 | struct io_kiocb *req; | |
9494 | ||
9495 | hlist_for_each_entry(req, list, hash_node) | |
9496 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9497 | req->task->task_works != NULL); | |
9498 | } | |
9499 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9500 | if (has_lock) |
9501 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9502 | } |
9503 | ||
9504 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9505 | { | |
9506 | struct io_ring_ctx *ctx = f->private_data; | |
9507 | ||
9508 | if (percpu_ref_tryget(&ctx->refs)) { | |
9509 | __io_uring_show_fdinfo(ctx, m); | |
9510 | percpu_ref_put(&ctx->refs); | |
9511 | } | |
9512 | } | |
bebdb65e | 9513 | #endif |
87ce955b | 9514 | |
2b188cc1 JA |
9515 | static const struct file_operations io_uring_fops = { |
9516 | .release = io_uring_release, | |
fcb323cc | 9517 | .flush = io_uring_flush, |
2b188cc1 | 9518 | .mmap = io_uring_mmap, |
6c5c240e RP |
9519 | #ifndef CONFIG_MMU |
9520 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9521 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9522 | #endif | |
2b188cc1 JA |
9523 | .poll = io_uring_poll, |
9524 | .fasync = io_uring_fasync, | |
bebdb65e | 9525 | #ifdef CONFIG_PROC_FS |
87ce955b | 9526 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9527 | #endif |
2b188cc1 JA |
9528 | }; |
9529 | ||
9530 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9531 | struct io_uring_params *p) | |
9532 | { | |
75b28aff HV |
9533 | struct io_rings *rings; |
9534 | size_t size, sq_array_offset; | |
2b188cc1 | 9535 | |
bd740481 JA |
9536 | /* make sure these are sane, as we already accounted them */ |
9537 | ctx->sq_entries = p->sq_entries; | |
9538 | ctx->cq_entries = p->cq_entries; | |
9539 | ||
75b28aff HV |
9540 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9541 | if (size == SIZE_MAX) | |
9542 | return -EOVERFLOW; | |
9543 | ||
9544 | rings = io_mem_alloc(size); | |
9545 | if (!rings) | |
2b188cc1 JA |
9546 | return -ENOMEM; |
9547 | ||
75b28aff HV |
9548 | ctx->rings = rings; |
9549 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9550 | rings->sq_ring_mask = p->sq_entries - 1; | |
9551 | rings->cq_ring_mask = p->cq_entries - 1; | |
9552 | rings->sq_ring_entries = p->sq_entries; | |
9553 | rings->cq_ring_entries = p->cq_entries; | |
9554 | ctx->sq_mask = rings->sq_ring_mask; | |
9555 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9556 | |
9557 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9558 | if (size == SIZE_MAX) { |
9559 | io_mem_free(ctx->rings); | |
9560 | ctx->rings = NULL; | |
2b188cc1 | 9561 | return -EOVERFLOW; |
eb065d30 | 9562 | } |
2b188cc1 JA |
9563 | |
9564 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9565 | if (!ctx->sq_sqes) { |
9566 | io_mem_free(ctx->rings); | |
9567 | ctx->rings = NULL; | |
2b188cc1 | 9568 | return -ENOMEM; |
eb065d30 | 9569 | } |
2b188cc1 | 9570 | |
2b188cc1 JA |
9571 | return 0; |
9572 | } | |
9573 | ||
9faadcc8 PB |
9574 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9575 | { | |
9576 | int ret, fd; | |
9577 | ||
9578 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9579 | if (fd < 0) | |
9580 | return fd; | |
9581 | ||
9582 | ret = io_uring_add_task_file(ctx, file); | |
9583 | if (ret) { | |
9584 | put_unused_fd(fd); | |
9585 | return ret; | |
9586 | } | |
9587 | fd_install(fd, file); | |
9588 | return fd; | |
9589 | } | |
9590 | ||
2b188cc1 JA |
9591 | /* |
9592 | * Allocate an anonymous fd, this is what constitutes the application | |
9593 | * visible backing of an io_uring instance. The application mmaps this | |
9594 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9595 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9596 | */ | |
9faadcc8 | 9597 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9598 | { |
9599 | struct file *file; | |
9faadcc8 | 9600 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9601 | int ret; |
9602 | ||
2b188cc1 JA |
9603 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9604 | &ctx->ring_sock); | |
9605 | if (ret) | |
9faadcc8 | 9606 | return ERR_PTR(ret); |
2b188cc1 JA |
9607 | #endif |
9608 | ||
2b188cc1 JA |
9609 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9610 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9611 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9612 | if (IS_ERR(file)) { |
9613 | sock_release(ctx->ring_sock); | |
9614 | ctx->ring_sock = NULL; | |
9615 | } else { | |
9616 | ctx->ring_sock->file = file; | |
0f212204 | 9617 | } |
2b188cc1 | 9618 | #endif |
9faadcc8 | 9619 | return file; |
2b188cc1 JA |
9620 | } |
9621 | ||
7f13657d XW |
9622 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9623 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9624 | { |
9625 | struct user_struct *user = NULL; | |
9626 | struct io_ring_ctx *ctx; | |
9faadcc8 | 9627 | struct file *file; |
aad5d8da | 9628 | bool limit_mem; |
2b188cc1 JA |
9629 | int ret; |
9630 | ||
8110c1a6 | 9631 | if (!entries) |
2b188cc1 | 9632 | return -EINVAL; |
8110c1a6 JA |
9633 | if (entries > IORING_MAX_ENTRIES) { |
9634 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9635 | return -EINVAL; | |
9636 | entries = IORING_MAX_ENTRIES; | |
9637 | } | |
2b188cc1 JA |
9638 | |
9639 | /* | |
9640 | * Use twice as many entries for the CQ ring. It's possible for the | |
9641 | * application to drive a higher depth than the size of the SQ ring, | |
9642 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9643 | * some flexibility in overcommitting a bit. If the application has |
9644 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9645 | * of CQ ring entries manually. | |
2b188cc1 JA |
9646 | */ |
9647 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9648 | if (p->flags & IORING_SETUP_CQSIZE) { |
9649 | /* | |
9650 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9651 | * to a power-of-two, if it isn't already. We do NOT impose | |
9652 | * any cq vs sq ring sizing. | |
9653 | */ | |
eb2667b3 | 9654 | if (!p->cq_entries) |
33a107f0 | 9655 | return -EINVAL; |
8110c1a6 JA |
9656 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9657 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9658 | return -EINVAL; | |
9659 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9660 | } | |
eb2667b3 JQ |
9661 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9662 | if (p->cq_entries < p->sq_entries) | |
9663 | return -EINVAL; | |
33a107f0 JA |
9664 | } else { |
9665 | p->cq_entries = 2 * p->sq_entries; | |
9666 | } | |
2b188cc1 JA |
9667 | |
9668 | user = get_uid(current_user()); | |
aad5d8da | 9669 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9670 | |
aad5d8da | 9671 | if (limit_mem) { |
a087e2b5 | 9672 | ret = __io_account_mem(user, |
2b188cc1 JA |
9673 | ring_pages(p->sq_entries, p->cq_entries)); |
9674 | if (ret) { | |
9675 | free_uid(user); | |
9676 | return ret; | |
9677 | } | |
9678 | } | |
9679 | ||
9680 | ctx = io_ring_ctx_alloc(p); | |
9681 | if (!ctx) { | |
aad5d8da | 9682 | if (limit_mem) |
a087e2b5 | 9683 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9684 | p->cq_entries)); |
9685 | free_uid(user); | |
9686 | return -ENOMEM; | |
9687 | } | |
9688 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9689 | ctx->user = user; |
0b8c0ec7 | 9690 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9691 | #ifdef CONFIG_AUDIT |
9692 | ctx->loginuid = current->loginuid; | |
9693 | ctx->sessionid = current->sessionid; | |
9694 | #endif | |
2aede0e4 JA |
9695 | ctx->sqo_task = get_task_struct(current); |
9696 | ||
9697 | /* | |
9698 | * This is just grabbed for accounting purposes. When a process exits, | |
9699 | * the mm is exited and dropped before the files, hence we need to hang | |
9700 | * on to this mm purely for the purposes of being able to unaccount | |
9701 | * memory (locked/pinned vm). It's not used for anything else. | |
9702 | */ | |
6b7898eb | 9703 | mmgrab(current->mm); |
2aede0e4 | 9704 | ctx->mm_account = current->mm; |
6b7898eb | 9705 | |
91d8f519 DZ |
9706 | #ifdef CONFIG_BLK_CGROUP |
9707 | /* | |
9708 | * The sq thread will belong to the original cgroup it was inited in. | |
9709 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9710 | * issued bios will be associated with the closest cgroup later in the | |
9711 | * block layer. | |
9712 | */ | |
9713 | rcu_read_lock(); | |
9714 | ctx->sqo_blkcg_css = blkcg_css(); | |
9715 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9716 | rcu_read_unlock(); | |
9717 | if (!ret) { | |
9718 | /* don't init against a dying cgroup, have the user try again */ | |
9719 | ctx->sqo_blkcg_css = NULL; | |
9720 | ret = -ENODEV; | |
9721 | goto err; | |
9722 | } | |
9723 | #endif | |
6b7898eb | 9724 | |
f74441e6 JA |
9725 | /* |
9726 | * Account memory _before_ installing the file descriptor. Once | |
9727 | * the descriptor is installed, it can get closed at any time. Also | |
9728 | * do this before hitting the general error path, as ring freeing | |
9729 | * will un-account as well. | |
9730 | */ | |
9731 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9732 | ACCT_LOCKED); | |
9733 | ctx->limit_mem = limit_mem; | |
9734 | ||
2b188cc1 JA |
9735 | ret = io_allocate_scq_urings(ctx, p); |
9736 | if (ret) | |
9737 | goto err; | |
9738 | ||
7e84e1c7 | 9739 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9740 | if (ret) |
9741 | goto err; | |
9742 | ||
7e84e1c7 SG |
9743 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9744 | io_sq_offload_start(ctx); | |
9745 | ||
2b188cc1 | 9746 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9747 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9748 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9749 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9750 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9751 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9752 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9753 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9754 | |
9755 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9756 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9757 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9758 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9759 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9760 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9761 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9762 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9763 | |
7f13657d XW |
9764 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9765 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9766 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9767 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9768 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9769 | |
9770 | if (copy_to_user(params, p, sizeof(*p))) { | |
9771 | ret = -EFAULT; | |
9772 | goto err; | |
9773 | } | |
d1719f70 | 9774 | |
9faadcc8 PB |
9775 | file = io_uring_get_file(ctx); |
9776 | if (IS_ERR(file)) { | |
9777 | ret = PTR_ERR(file); | |
9778 | goto err; | |
9779 | } | |
9780 | ||
044c1ab3 JA |
9781 | /* |
9782 | * Install ring fd as the very last thing, so we don't risk someone | |
9783 | * having closed it before we finish setup | |
9784 | */ | |
9faadcc8 PB |
9785 | ret = io_uring_install_fd(ctx, file); |
9786 | if (ret < 0) { | |
06585c49 | 9787 | io_disable_sqo_submit(ctx); |
9faadcc8 PB |
9788 | /* fput will clean it up */ |
9789 | fput(file); | |
9790 | return ret; | |
9791 | } | |
044c1ab3 | 9792 | |
c826bd7a | 9793 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9794 | return ret; |
9795 | err: | |
d9d05217 | 9796 | io_disable_sqo_submit(ctx); |
2b188cc1 JA |
9797 | io_ring_ctx_wait_and_kill(ctx); |
9798 | return ret; | |
9799 | } | |
9800 | ||
9801 | /* | |
9802 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9803 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9804 | * params structure passed in. | |
9805 | */ | |
9806 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9807 | { | |
9808 | struct io_uring_params p; | |
2b188cc1 JA |
9809 | int i; |
9810 | ||
9811 | if (copy_from_user(&p, params, sizeof(p))) | |
9812 | return -EFAULT; | |
9813 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9814 | if (p.resv[i]) | |
9815 | return -EINVAL; | |
9816 | } | |
9817 | ||
6c271ce2 | 9818 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9819 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9820 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9821 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9822 | return -EINVAL; |
9823 | ||
7f13657d | 9824 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9825 | } |
9826 | ||
9827 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9828 | struct io_uring_params __user *, params) | |
9829 | { | |
9830 | return io_uring_setup(entries, params); | |
9831 | } | |
9832 | ||
66f4af93 JA |
9833 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9834 | { | |
9835 | struct io_uring_probe *p; | |
9836 | size_t size; | |
9837 | int i, ret; | |
9838 | ||
9839 | size = struct_size(p, ops, nr_args); | |
9840 | if (size == SIZE_MAX) | |
9841 | return -EOVERFLOW; | |
9842 | p = kzalloc(size, GFP_KERNEL); | |
9843 | if (!p) | |
9844 | return -ENOMEM; | |
9845 | ||
9846 | ret = -EFAULT; | |
9847 | if (copy_from_user(p, arg, size)) | |
9848 | goto out; | |
9849 | ret = -EINVAL; | |
9850 | if (memchr_inv(p, 0, size)) | |
9851 | goto out; | |
9852 | ||
9853 | p->last_op = IORING_OP_LAST - 1; | |
9854 | if (nr_args > IORING_OP_LAST) | |
9855 | nr_args = IORING_OP_LAST; | |
9856 | ||
9857 | for (i = 0; i < nr_args; i++) { | |
9858 | p->ops[i].op = i; | |
9859 | if (!io_op_defs[i].not_supported) | |
9860 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9861 | } | |
9862 | p->ops_len = i; | |
9863 | ||
9864 | ret = 0; | |
9865 | if (copy_to_user(arg, p, size)) | |
9866 | ret = -EFAULT; | |
9867 | out: | |
9868 | kfree(p); | |
9869 | return ret; | |
9870 | } | |
9871 | ||
071698e1 JA |
9872 | static int io_register_personality(struct io_ring_ctx *ctx) |
9873 | { | |
1e6fa521 JA |
9874 | struct io_identity *id; |
9875 | int ret; | |
071698e1 | 9876 | |
1e6fa521 JA |
9877 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9878 | if (unlikely(!id)) | |
9879 | return -ENOMEM; | |
9880 | ||
9881 | io_init_identity(id); | |
9882 | id->creds = get_current_cred(); | |
9883 | ||
9884 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9885 | if (ret < 0) { | |
9886 | put_cred(id->creds); | |
9887 | kfree(id); | |
9888 | } | |
9889 | return ret; | |
071698e1 JA |
9890 | } |
9891 | ||
9892 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9893 | { | |
1e6fa521 | 9894 | struct io_identity *iod; |
071698e1 | 9895 | |
1e6fa521 JA |
9896 | iod = idr_remove(&ctx->personality_idr, id); |
9897 | if (iod) { | |
9898 | put_cred(iod->creds); | |
9899 | if (refcount_dec_and_test(&iod->count)) | |
9900 | kfree(iod); | |
071698e1 JA |
9901 | return 0; |
9902 | } | |
9903 | ||
9904 | return -EINVAL; | |
9905 | } | |
9906 | ||
21b55dbc SG |
9907 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9908 | unsigned int nr_args) | |
9909 | { | |
9910 | struct io_uring_restriction *res; | |
9911 | size_t size; | |
9912 | int i, ret; | |
9913 | ||
7e84e1c7 SG |
9914 | /* Restrictions allowed only if rings started disabled */ |
9915 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9916 | return -EBADFD; | |
9917 | ||
21b55dbc | 9918 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9919 | if (ctx->restrictions.registered) |
21b55dbc SG |
9920 | return -EBUSY; |
9921 | ||
9922 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9923 | return -EINVAL; | |
9924 | ||
9925 | size = array_size(nr_args, sizeof(*res)); | |
9926 | if (size == SIZE_MAX) | |
9927 | return -EOVERFLOW; | |
9928 | ||
9929 | res = memdup_user(arg, size); | |
9930 | if (IS_ERR(res)) | |
9931 | return PTR_ERR(res); | |
9932 | ||
9933 | ret = 0; | |
9934 | ||
9935 | for (i = 0; i < nr_args; i++) { | |
9936 | switch (res[i].opcode) { | |
9937 | case IORING_RESTRICTION_REGISTER_OP: | |
9938 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9939 | ret = -EINVAL; | |
9940 | goto out; | |
9941 | } | |
9942 | ||
9943 | __set_bit(res[i].register_op, | |
9944 | ctx->restrictions.register_op); | |
9945 | break; | |
9946 | case IORING_RESTRICTION_SQE_OP: | |
9947 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9948 | ret = -EINVAL; | |
9949 | goto out; | |
9950 | } | |
9951 | ||
9952 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9953 | break; | |
9954 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9955 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9956 | break; | |
9957 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9958 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9959 | break; | |
9960 | default: | |
9961 | ret = -EINVAL; | |
9962 | goto out; | |
9963 | } | |
9964 | } | |
9965 | ||
9966 | out: | |
9967 | /* Reset all restrictions if an error happened */ | |
9968 | if (ret != 0) | |
9969 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9970 | else | |
7e84e1c7 | 9971 | ctx->restrictions.registered = true; |
21b55dbc SG |
9972 | |
9973 | kfree(res); | |
9974 | return ret; | |
9975 | } | |
9976 | ||
7e84e1c7 SG |
9977 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9978 | { | |
9979 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9980 | return -EBADFD; | |
9981 | ||
9982 | if (ctx->restrictions.registered) | |
9983 | ctx->restricted = 1; | |
9984 | ||
9985 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9986 | ||
9987 | io_sq_offload_start(ctx); | |
9988 | ||
9989 | return 0; | |
9990 | } | |
9991 | ||
071698e1 JA |
9992 | static bool io_register_op_must_quiesce(int op) |
9993 | { | |
9994 | switch (op) { | |
9995 | case IORING_UNREGISTER_FILES: | |
9996 | case IORING_REGISTER_FILES_UPDATE: | |
9997 | case IORING_REGISTER_PROBE: | |
9998 | case IORING_REGISTER_PERSONALITY: | |
9999 | case IORING_UNREGISTER_PERSONALITY: | |
10000 | return false; | |
10001 | default: | |
10002 | return true; | |
10003 | } | |
10004 | } | |
10005 | ||
edafccee JA |
10006 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10007 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10008 | __releases(ctx->uring_lock) |
10009 | __acquires(ctx->uring_lock) | |
edafccee JA |
10010 | { |
10011 | int ret; | |
10012 | ||
35fa71a0 JA |
10013 | /* |
10014 | * We're inside the ring mutex, if the ref is already dying, then | |
10015 | * someone else killed the ctx or is already going through | |
10016 | * io_uring_register(). | |
10017 | */ | |
10018 | if (percpu_ref_is_dying(&ctx->refs)) | |
10019 | return -ENXIO; | |
10020 | ||
071698e1 | 10021 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10022 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 10023 | |
05f3fb3c JA |
10024 | /* |
10025 | * Drop uring mutex before waiting for references to exit. If | |
10026 | * another thread is currently inside io_uring_enter() it might | |
10027 | * need to grab the uring_lock to make progress. If we hold it | |
10028 | * here across the drain wait, then we can deadlock. It's safe | |
10029 | * to drop the mutex here, since no new references will come in | |
10030 | * after we've killed the percpu ref. | |
10031 | */ | |
10032 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
10033 | do { |
10034 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10035 | if (!ret) | |
10036 | break; | |
ed6930c9 JA |
10037 | ret = io_run_task_work_sig(); |
10038 | if (ret < 0) | |
10039 | break; | |
af9c1a44 JA |
10040 | } while (1); |
10041 | ||
05f3fb3c | 10042 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 10043 | |
c150368b JA |
10044 | if (ret) { |
10045 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
10046 | goto out_quiesce; |
10047 | } | |
10048 | } | |
10049 | ||
10050 | if (ctx->restricted) { | |
10051 | if (opcode >= IORING_REGISTER_LAST) { | |
10052 | ret = -EINVAL; | |
10053 | goto out; | |
10054 | } | |
10055 | ||
10056 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
10057 | ret = -EACCES; | |
c150368b JA |
10058 | goto out; |
10059 | } | |
05f3fb3c | 10060 | } |
edafccee JA |
10061 | |
10062 | switch (opcode) { | |
10063 | case IORING_REGISTER_BUFFERS: | |
0a96bbe4 | 10064 | ret = io_sqe_buffers_register(ctx, arg, nr_args); |
edafccee JA |
10065 | break; |
10066 | case IORING_UNREGISTER_BUFFERS: | |
10067 | ret = -EINVAL; | |
10068 | if (arg || nr_args) | |
10069 | break; | |
0a96bbe4 | 10070 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10071 | break; |
6b06314c JA |
10072 | case IORING_REGISTER_FILES: |
10073 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
10074 | break; | |
10075 | case IORING_UNREGISTER_FILES: | |
10076 | ret = -EINVAL; | |
10077 | if (arg || nr_args) | |
10078 | break; | |
10079 | ret = io_sqe_files_unregister(ctx); | |
10080 | break; | |
c3a31e60 JA |
10081 | case IORING_REGISTER_FILES_UPDATE: |
10082 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
10083 | break; | |
9b402849 | 10084 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10085 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10086 | ret = -EINVAL; |
10087 | if (nr_args != 1) | |
10088 | break; | |
10089 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10090 | if (ret) |
10091 | break; | |
10092 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10093 | ctx->eventfd_async = 1; | |
10094 | else | |
10095 | ctx->eventfd_async = 0; | |
9b402849 JA |
10096 | break; |
10097 | case IORING_UNREGISTER_EVENTFD: | |
10098 | ret = -EINVAL; | |
10099 | if (arg || nr_args) | |
10100 | break; | |
10101 | ret = io_eventfd_unregister(ctx); | |
10102 | break; | |
66f4af93 JA |
10103 | case IORING_REGISTER_PROBE: |
10104 | ret = -EINVAL; | |
10105 | if (!arg || nr_args > 256) | |
10106 | break; | |
10107 | ret = io_probe(ctx, arg, nr_args); | |
10108 | break; | |
071698e1 JA |
10109 | case IORING_REGISTER_PERSONALITY: |
10110 | ret = -EINVAL; | |
10111 | if (arg || nr_args) | |
10112 | break; | |
10113 | ret = io_register_personality(ctx); | |
10114 | break; | |
10115 | case IORING_UNREGISTER_PERSONALITY: | |
10116 | ret = -EINVAL; | |
10117 | if (arg) | |
10118 | break; | |
10119 | ret = io_unregister_personality(ctx, nr_args); | |
10120 | break; | |
7e84e1c7 SG |
10121 | case IORING_REGISTER_ENABLE_RINGS: |
10122 | ret = -EINVAL; | |
10123 | if (arg || nr_args) | |
10124 | break; | |
10125 | ret = io_register_enable_rings(ctx); | |
10126 | break; | |
21b55dbc SG |
10127 | case IORING_REGISTER_RESTRICTIONS: |
10128 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10129 | break; | |
edafccee JA |
10130 | default: |
10131 | ret = -EINVAL; | |
10132 | break; | |
10133 | } | |
10134 | ||
21b55dbc | 10135 | out: |
071698e1 | 10136 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10137 | /* bring the ctx back to life */ |
05f3fb3c | 10138 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 10139 | out_quiesce: |
0f158b4c | 10140 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10141 | } |
edafccee JA |
10142 | return ret; |
10143 | } | |
10144 | ||
10145 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10146 | void __user *, arg, unsigned int, nr_args) | |
10147 | { | |
10148 | struct io_ring_ctx *ctx; | |
10149 | long ret = -EBADF; | |
10150 | struct fd f; | |
10151 | ||
10152 | f = fdget(fd); | |
10153 | if (!f.file) | |
10154 | return -EBADF; | |
10155 | ||
10156 | ret = -EOPNOTSUPP; | |
10157 | if (f.file->f_op != &io_uring_fops) | |
10158 | goto out_fput; | |
10159 | ||
10160 | ctx = f.file->private_data; | |
10161 | ||
10162 | mutex_lock(&ctx->uring_lock); | |
10163 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10164 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10165 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10166 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10167 | out_fput: |
10168 | fdput(f); | |
10169 | return ret; | |
10170 | } | |
10171 | ||
2b188cc1 JA |
10172 | static int __init io_uring_init(void) |
10173 | { | |
d7f62e82 SM |
10174 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10175 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10176 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10177 | } while (0) | |
10178 | ||
10179 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10180 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10181 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10182 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10183 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10184 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10185 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10186 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10187 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10188 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10189 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10190 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10191 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10192 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10193 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10194 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10195 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10196 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10197 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10198 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10199 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10200 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10201 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10202 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10203 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10204 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10205 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10206 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10207 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
10208 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 10209 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10210 | |
d3656344 | 10211 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10212 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
10213 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
10214 | return 0; | |
10215 | }; | |
10216 | __initcall(io_uring_init); |