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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 | ||
45d189c6 PB |
190 | enum io_uring_cmd_flags { |
191 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 192 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
193 | }; |
194 | ||
edafccee JA |
195 | struct io_mapped_ubuf { |
196 | u64 ubuf; | |
197 | size_t len; | |
198 | struct bio_vec *bvec; | |
199 | unsigned int nr_bvecs; | |
de293938 | 200 | unsigned long acct_pages; |
edafccee JA |
201 | }; |
202 | ||
50238531 BM |
203 | struct io_ring_ctx; |
204 | ||
269bbe5f BM |
205 | struct io_rsrc_put { |
206 | struct list_head list; | |
50238531 BM |
207 | union { |
208 | void *rsrc; | |
209 | struct file *file; | |
210 | }; | |
269bbe5f BM |
211 | }; |
212 | ||
213 | struct fixed_rsrc_table { | |
65e19f54 | 214 | struct file **files; |
31b51510 JA |
215 | }; |
216 | ||
269bbe5f | 217 | struct fixed_rsrc_ref_node { |
05589553 XW |
218 | struct percpu_ref refs; |
219 | struct list_head node; | |
269bbe5f BM |
220 | struct list_head rsrc_list; |
221 | struct fixed_rsrc_data *rsrc_data; | |
50238531 BM |
222 | void (*rsrc_put)(struct io_ring_ctx *ctx, |
223 | struct io_rsrc_put *prsrc); | |
4a38aed2 | 224 | struct llist_node llist; |
e297822b | 225 | bool done; |
05589553 XW |
226 | }; |
227 | ||
269bbe5f BM |
228 | struct fixed_rsrc_data { |
229 | struct fixed_rsrc_table *table; | |
05f3fb3c JA |
230 | struct io_ring_ctx *ctx; |
231 | ||
269bbe5f | 232 | struct fixed_rsrc_ref_node *node; |
05f3fb3c | 233 | struct percpu_ref refs; |
05f3fb3c JA |
234 | struct completion done; |
235 | }; | |
236 | ||
5a2e745d JA |
237 | struct io_buffer { |
238 | struct list_head list; | |
239 | __u64 addr; | |
240 | __s32 len; | |
241 | __u16 bid; | |
242 | }; | |
243 | ||
21b55dbc SG |
244 | struct io_restriction { |
245 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
246 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
247 | u8 sqe_flags_allowed; | |
248 | u8 sqe_flags_required; | |
7e84e1c7 | 249 | bool registered; |
21b55dbc SG |
250 | }; |
251 | ||
534ca6d6 JA |
252 | struct io_sq_data { |
253 | refcount_t refs; | |
69fb2131 JA |
254 | struct mutex lock; |
255 | ||
256 | /* ctx's that are using this sqd */ | |
257 | struct list_head ctx_list; | |
258 | struct list_head ctx_new_list; | |
259 | struct mutex ctx_lock; | |
260 | ||
534ca6d6 JA |
261 | struct task_struct *thread; |
262 | struct wait_queue_head wait; | |
08369246 XW |
263 | |
264 | unsigned sq_thread_idle; | |
534ca6d6 JA |
265 | }; |
266 | ||
258b29a9 | 267 | #define IO_IOPOLL_BATCH 8 |
6dd0be1e | 268 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 269 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 270 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
271 | |
272 | struct io_comp_state { | |
6dd0be1e | 273 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 274 | unsigned int nr; |
c7dae4ba JA |
275 | unsigned int locked_free_nr; |
276 | /* inline/task_work completion list, under ->uring_lock */ | |
1b4c351f | 277 | struct list_head free_list; |
c7dae4ba JA |
278 | /* IRQ completion list, under ->completion_lock */ |
279 | struct list_head locked_free_list; | |
258b29a9 PB |
280 | }; |
281 | ||
282 | struct io_submit_state { | |
283 | struct blk_plug plug; | |
284 | ||
285 | /* | |
286 | * io_kiocb alloc cache | |
287 | */ | |
bf019da7 | 288 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
289 | unsigned int free_reqs; |
290 | ||
291 | bool plug_started; | |
292 | ||
293 | /* | |
294 | * Batch completion logic | |
295 | */ | |
296 | struct io_comp_state comp; | |
297 | ||
298 | /* | |
299 | * File reference cache | |
300 | */ | |
301 | struct file *file; | |
302 | unsigned int fd; | |
303 | unsigned int file_refs; | |
304 | unsigned int ios_left; | |
305 | }; | |
306 | ||
2b188cc1 JA |
307 | struct io_ring_ctx { |
308 | struct { | |
309 | struct percpu_ref refs; | |
310 | } ____cacheline_aligned_in_smp; | |
311 | ||
312 | struct { | |
313 | unsigned int flags; | |
e1d85334 | 314 | unsigned int compat: 1; |
aad5d8da | 315 | unsigned int limit_mem: 1; |
e1d85334 RD |
316 | unsigned int cq_overflow_flushed: 1; |
317 | unsigned int drain_next: 1; | |
318 | unsigned int eventfd_async: 1; | |
21b55dbc | 319 | unsigned int restricted: 1; |
d9d05217 | 320 | unsigned int sqo_dead: 1; |
2b188cc1 | 321 | |
75b28aff HV |
322 | /* |
323 | * Ring buffer of indices into array of io_uring_sqe, which is | |
324 | * mmapped by the application using the IORING_OFF_SQES offset. | |
325 | * | |
326 | * This indirection could e.g. be used to assign fixed | |
327 | * io_uring_sqe entries to operations and only submit them to | |
328 | * the queue when needed. | |
329 | * | |
330 | * The kernel modifies neither the indices array nor the entries | |
331 | * array. | |
332 | */ | |
333 | u32 *sq_array; | |
2b188cc1 JA |
334 | unsigned cached_sq_head; |
335 | unsigned sq_entries; | |
336 | unsigned sq_mask; | |
6c271ce2 | 337 | unsigned sq_thread_idle; |
498ccd9e | 338 | unsigned cached_sq_dropped; |
2c3bac6d | 339 | unsigned cached_cq_overflow; |
ad3eb2c8 | 340 | unsigned long sq_check_overflow; |
de0617e4 JA |
341 | |
342 | struct list_head defer_list; | |
5262f567 | 343 | struct list_head timeout_list; |
1d7bb1d5 | 344 | struct list_head cq_overflow_list; |
fcb323cc | 345 | |
ad3eb2c8 | 346 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
347 | } ____cacheline_aligned_in_smp; |
348 | ||
3c1a2ead JA |
349 | struct { |
350 | struct mutex uring_lock; | |
351 | wait_queue_head_t wait; | |
352 | } ____cacheline_aligned_in_smp; | |
353 | ||
354 | struct io_submit_state submit_state; | |
355 | ||
206aefde JA |
356 | struct io_rings *rings; |
357 | ||
2b188cc1 | 358 | /* IO offload */ |
561fb04a | 359 | struct io_wq *io_wq; |
2aede0e4 JA |
360 | |
361 | /* | |
362 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
363 | * have access to the ->files | |
364 | */ | |
365 | struct task_struct *sqo_task; | |
366 | ||
367 | /* Only used for accounting purposes */ | |
368 | struct mm_struct *mm_account; | |
369 | ||
91d8f519 DZ |
370 | #ifdef CONFIG_BLK_CGROUP |
371 | struct cgroup_subsys_state *sqo_blkcg_css; | |
372 | #endif | |
373 | ||
534ca6d6 JA |
374 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
375 | ||
90554200 | 376 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 377 | struct list_head sqd_list; |
75b28aff | 378 | |
6b06314c JA |
379 | /* |
380 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
381 | * readers must ensure that ->refs is alive as long as the file* is | |
382 | * used. Only updated through io_uring_register(2). | |
383 | */ | |
269bbe5f | 384 | struct fixed_rsrc_data *file_data; |
6b06314c JA |
385 | unsigned nr_user_files; |
386 | ||
edafccee JA |
387 | /* if used, fixed mapped user buffers */ |
388 | unsigned nr_user_bufs; | |
389 | struct io_mapped_ubuf *user_bufs; | |
390 | ||
2b188cc1 JA |
391 | struct user_struct *user; |
392 | ||
0b8c0ec7 | 393 | const struct cred *creds; |
181e448d | 394 | |
4ea33a97 JA |
395 | #ifdef CONFIG_AUDIT |
396 | kuid_t loginuid; | |
397 | unsigned int sessionid; | |
398 | #endif | |
399 | ||
0f158b4c JA |
400 | struct completion ref_comp; |
401 | struct completion sq_thread_comp; | |
206aefde JA |
402 | |
403 | #if defined(CONFIG_UNIX) | |
404 | struct socket *ring_sock; | |
405 | #endif | |
406 | ||
5a2e745d JA |
407 | struct idr io_buffer_idr; |
408 | ||
071698e1 JA |
409 | struct idr personality_idr; |
410 | ||
206aefde JA |
411 | struct { |
412 | unsigned cached_cq_tail; | |
413 | unsigned cq_entries; | |
414 | unsigned cq_mask; | |
415 | atomic_t cq_timeouts; | |
f010505b | 416 | unsigned cq_last_tm_flush; |
ad3eb2c8 | 417 | unsigned long cq_check_overflow; |
206aefde JA |
418 | struct wait_queue_head cq_wait; |
419 | struct fasync_struct *cq_fasync; | |
420 | struct eventfd_ctx *cq_ev_fd; | |
421 | } ____cacheline_aligned_in_smp; | |
2b188cc1 | 422 | |
2b188cc1 JA |
423 | struct { |
424 | spinlock_t completion_lock; | |
e94f141b | 425 | |
def596e9 | 426 | /* |
540e32a0 | 427 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
428 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
429 | * For SQPOLL, only the single threaded io_sq_thread() will | |
430 | * manipulate the list, hence no extra locking is needed there. | |
431 | */ | |
540e32a0 | 432 | struct list_head iopoll_list; |
78076bb6 JA |
433 | struct hlist_head *cancel_hash; |
434 | unsigned cancel_hash_bits; | |
e94f141b | 435 | bool poll_multi_file; |
31b51510 | 436 | |
fcb323cc JA |
437 | spinlock_t inflight_lock; |
438 | struct list_head inflight_list; | |
2b188cc1 | 439 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 440 | |
269bbe5f BM |
441 | struct delayed_work rsrc_put_work; |
442 | struct llist_head rsrc_put_llist; | |
d67d2263 BM |
443 | struct list_head rsrc_ref_list; |
444 | spinlock_t rsrc_ref_lock; | |
4a38aed2 | 445 | |
21b55dbc | 446 | struct io_restriction restrictions; |
3c1a2ead JA |
447 | |
448 | /* Keep this last, we don't need it for the fast path */ | |
449 | struct work_struct exit_work; | |
2b188cc1 JA |
450 | }; |
451 | ||
09bb8394 JA |
452 | /* |
453 | * First field must be the file pointer in all the | |
454 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
455 | */ | |
221c5eb2 JA |
456 | struct io_poll_iocb { |
457 | struct file *file; | |
018043be | 458 | struct wait_queue_head *head; |
221c5eb2 | 459 | __poll_t events; |
8c838788 | 460 | bool done; |
221c5eb2 | 461 | bool canceled; |
392edb45 | 462 | struct wait_queue_entry wait; |
221c5eb2 JA |
463 | }; |
464 | ||
018043be PB |
465 | struct io_poll_remove { |
466 | struct file *file; | |
467 | u64 addr; | |
468 | }; | |
469 | ||
b5dba59e JA |
470 | struct io_close { |
471 | struct file *file; | |
b5dba59e JA |
472 | int fd; |
473 | }; | |
474 | ||
ad8a48ac JA |
475 | struct io_timeout_data { |
476 | struct io_kiocb *req; | |
477 | struct hrtimer timer; | |
478 | struct timespec64 ts; | |
479 | enum hrtimer_mode mode; | |
480 | }; | |
481 | ||
8ed8d3c3 JA |
482 | struct io_accept { |
483 | struct file *file; | |
484 | struct sockaddr __user *addr; | |
485 | int __user *addr_len; | |
486 | int flags; | |
09952e3e | 487 | unsigned long nofile; |
8ed8d3c3 JA |
488 | }; |
489 | ||
490 | struct io_sync { | |
491 | struct file *file; | |
492 | loff_t len; | |
493 | loff_t off; | |
494 | int flags; | |
d63d1b5e | 495 | int mode; |
8ed8d3c3 JA |
496 | }; |
497 | ||
fbf23849 JA |
498 | struct io_cancel { |
499 | struct file *file; | |
500 | u64 addr; | |
501 | }; | |
502 | ||
b29472ee JA |
503 | struct io_timeout { |
504 | struct file *file; | |
bfe68a22 PB |
505 | u32 off; |
506 | u32 target_seq; | |
135fcde8 | 507 | struct list_head list; |
90cd7e42 PB |
508 | /* head of the link, used by linked timeouts only */ |
509 | struct io_kiocb *head; | |
b29472ee JA |
510 | }; |
511 | ||
0bdf7a2d PB |
512 | struct io_timeout_rem { |
513 | struct file *file; | |
514 | u64 addr; | |
9c8e11b3 PB |
515 | |
516 | /* timeout update */ | |
517 | struct timespec64 ts; | |
518 | u32 flags; | |
0bdf7a2d PB |
519 | }; |
520 | ||
9adbd45d JA |
521 | struct io_rw { |
522 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
523 | struct kiocb kiocb; | |
524 | u64 addr; | |
525 | u64 len; | |
526 | }; | |
527 | ||
3fbb51c1 JA |
528 | struct io_connect { |
529 | struct file *file; | |
530 | struct sockaddr __user *addr; | |
531 | int addr_len; | |
532 | }; | |
533 | ||
e47293fd JA |
534 | struct io_sr_msg { |
535 | struct file *file; | |
fddaface | 536 | union { |
270a5940 | 537 | struct user_msghdr __user *umsg; |
fddaface JA |
538 | void __user *buf; |
539 | }; | |
e47293fd | 540 | int msg_flags; |
bcda7baa | 541 | int bgid; |
fddaface | 542 | size_t len; |
bcda7baa | 543 | struct io_buffer *kbuf; |
e47293fd JA |
544 | }; |
545 | ||
15b71abe JA |
546 | struct io_open { |
547 | struct file *file; | |
548 | int dfd; | |
15b71abe | 549 | struct filename *filename; |
c12cedf2 | 550 | struct open_how how; |
4022e7af | 551 | unsigned long nofile; |
15b71abe JA |
552 | }; |
553 | ||
269bbe5f | 554 | struct io_rsrc_update { |
05f3fb3c JA |
555 | struct file *file; |
556 | u64 arg; | |
557 | u32 nr_args; | |
558 | u32 offset; | |
559 | }; | |
560 | ||
4840e418 JA |
561 | struct io_fadvise { |
562 | struct file *file; | |
563 | u64 offset; | |
564 | u32 len; | |
565 | u32 advice; | |
566 | }; | |
567 | ||
c1ca757b JA |
568 | struct io_madvise { |
569 | struct file *file; | |
570 | u64 addr; | |
571 | u32 len; | |
572 | u32 advice; | |
573 | }; | |
574 | ||
3e4827b0 JA |
575 | struct io_epoll { |
576 | struct file *file; | |
577 | int epfd; | |
578 | int op; | |
579 | int fd; | |
580 | struct epoll_event event; | |
e47293fd JA |
581 | }; |
582 | ||
7d67af2c PB |
583 | struct io_splice { |
584 | struct file *file_out; | |
585 | struct file *file_in; | |
586 | loff_t off_out; | |
587 | loff_t off_in; | |
588 | u64 len; | |
589 | unsigned int flags; | |
590 | }; | |
591 | ||
ddf0322d JA |
592 | struct io_provide_buf { |
593 | struct file *file; | |
594 | __u64 addr; | |
595 | __s32 len; | |
596 | __u32 bgid; | |
597 | __u16 nbufs; | |
598 | __u16 bid; | |
599 | }; | |
600 | ||
1d9e1288 BM |
601 | struct io_statx { |
602 | struct file *file; | |
603 | int dfd; | |
604 | unsigned int mask; | |
605 | unsigned int flags; | |
e62753e4 | 606 | const char __user *filename; |
1d9e1288 BM |
607 | struct statx __user *buffer; |
608 | }; | |
609 | ||
36f4fa68 JA |
610 | struct io_shutdown { |
611 | struct file *file; | |
612 | int how; | |
613 | }; | |
614 | ||
80a261fd JA |
615 | struct io_rename { |
616 | struct file *file; | |
617 | int old_dfd; | |
618 | int new_dfd; | |
619 | struct filename *oldpath; | |
620 | struct filename *newpath; | |
621 | int flags; | |
622 | }; | |
623 | ||
14a1143b JA |
624 | struct io_unlink { |
625 | struct file *file; | |
626 | int dfd; | |
627 | int flags; | |
628 | struct filename *filename; | |
629 | }; | |
630 | ||
3ca405eb PB |
631 | struct io_completion { |
632 | struct file *file; | |
633 | struct list_head list; | |
0f7e466b | 634 | int cflags; |
3ca405eb PB |
635 | }; |
636 | ||
f499a021 JA |
637 | struct io_async_connect { |
638 | struct sockaddr_storage address; | |
639 | }; | |
640 | ||
03b1230c JA |
641 | struct io_async_msghdr { |
642 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
643 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
644 | struct iovec *free_iov; | |
03b1230c JA |
645 | struct sockaddr __user *uaddr; |
646 | struct msghdr msg; | |
b537916c | 647 | struct sockaddr_storage addr; |
03b1230c JA |
648 | }; |
649 | ||
f67676d1 JA |
650 | struct io_async_rw { |
651 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
652 | const struct iovec *free_iovec; |
653 | struct iov_iter iter; | |
227c0c96 | 654 | size_t bytes_done; |
bcf5a063 | 655 | struct wait_page_queue wpq; |
f67676d1 JA |
656 | }; |
657 | ||
6b47ee6e PB |
658 | enum { |
659 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
660 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
661 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
662 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
663 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 664 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 665 | |
6b47ee6e PB |
666 | REQ_F_FAIL_LINK_BIT, |
667 | REQ_F_INFLIGHT_BIT, | |
668 | REQ_F_CUR_POS_BIT, | |
669 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 670 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 671 | REQ_F_ISREG_BIT, |
99bc4c38 | 672 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 673 | REQ_F_POLLED_BIT, |
bcda7baa | 674 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 675 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 676 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 677 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 678 | REQ_F_COMPLETE_INLINE_BIT, |
84557871 JA |
679 | |
680 | /* not a real bit, just to check we're not overflowing the space */ | |
681 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
682 | }; |
683 | ||
684 | enum { | |
685 | /* ctx owns file */ | |
686 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
687 | /* drain existing IO first */ | |
688 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
689 | /* linked sqes */ | |
690 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
691 | /* doesn't sever on completion < 0 */ | |
692 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
693 | /* IOSQE_ASYNC */ | |
694 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
695 | /* IOSQE_BUFFER_SELECT */ |
696 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 697 | |
6b47ee6e PB |
698 | /* fail rest of links */ |
699 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
700 | /* on inflight list */ | |
701 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
702 | /* read/write uses file position */ | |
703 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
704 | /* must not punt to workers */ | |
705 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 706 | /* has or had linked timeout */ |
6b47ee6e | 707 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
708 | /* regular file */ |
709 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
710 | /* needs cleanup */ |
711 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
712 | /* already went through poll handler */ |
713 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
714 | /* buffer already selected */ |
715 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
716 | /* doesn't need file table for this request */ |
717 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
718 | /* io_wq_work is initialized */ |
719 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
720 | /* linked timeout is active, i.e. prepared by link's head */ |
721 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
722 | /* completion is deferred through io_comp_state */ |
723 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
d7718a9d JA |
724 | }; |
725 | ||
726 | struct async_poll { | |
727 | struct io_poll_iocb poll; | |
807abcb0 | 728 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
729 | }; |
730 | ||
7cbf1722 JA |
731 | struct io_task_work { |
732 | struct io_wq_work_node node; | |
733 | task_work_func_t func; | |
734 | }; | |
735 | ||
09bb8394 JA |
736 | /* |
737 | * NOTE! Each of the iocb union members has the file pointer | |
738 | * as the first entry in their struct definition. So you can | |
739 | * access the file pointer through any of the sub-structs, | |
740 | * or directly as just 'ki_filp' in this struct. | |
741 | */ | |
2b188cc1 | 742 | struct io_kiocb { |
221c5eb2 | 743 | union { |
09bb8394 | 744 | struct file *file; |
9adbd45d | 745 | struct io_rw rw; |
221c5eb2 | 746 | struct io_poll_iocb poll; |
018043be | 747 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
748 | struct io_accept accept; |
749 | struct io_sync sync; | |
fbf23849 | 750 | struct io_cancel cancel; |
b29472ee | 751 | struct io_timeout timeout; |
0bdf7a2d | 752 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 753 | struct io_connect connect; |
e47293fd | 754 | struct io_sr_msg sr_msg; |
15b71abe | 755 | struct io_open open; |
b5dba59e | 756 | struct io_close close; |
269bbe5f | 757 | struct io_rsrc_update rsrc_update; |
4840e418 | 758 | struct io_fadvise fadvise; |
c1ca757b | 759 | struct io_madvise madvise; |
3e4827b0 | 760 | struct io_epoll epoll; |
7d67af2c | 761 | struct io_splice splice; |
ddf0322d | 762 | struct io_provide_buf pbuf; |
1d9e1288 | 763 | struct io_statx statx; |
36f4fa68 | 764 | struct io_shutdown shutdown; |
80a261fd | 765 | struct io_rename rename; |
14a1143b | 766 | struct io_unlink unlink; |
3ca405eb PB |
767 | /* use only after cleaning per-op data, see io_clean_op() */ |
768 | struct io_completion compl; | |
221c5eb2 | 769 | }; |
2b188cc1 | 770 | |
e8c2bc1f JA |
771 | /* opcode allocated if it needs to store data for async defer */ |
772 | void *async_data; | |
d625c6ee | 773 | u8 opcode; |
65a6543d XW |
774 | /* polled IO has completed */ |
775 | u8 iopoll_completed; | |
2b188cc1 | 776 | |
4f4eeba8 | 777 | u16 buf_index; |
9cf7c104 | 778 | u32 result; |
4f4eeba8 | 779 | |
010e8e6b PB |
780 | struct io_ring_ctx *ctx; |
781 | unsigned int flags; | |
782 | refcount_t refs; | |
783 | struct task_struct *task; | |
784 | u64 user_data; | |
d7718a9d | 785 | |
f2f87370 | 786 | struct io_kiocb *link; |
269bbe5f | 787 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 788 | |
d21ffe7e PB |
789 | /* |
790 | * 1. used with ctx->iopoll_list with reads/writes | |
791 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
792 | */ | |
010e8e6b | 793 | struct list_head inflight_entry; |
7cbf1722 JA |
794 | union { |
795 | struct io_task_work io_task_work; | |
796 | struct callback_head task_work; | |
797 | }; | |
010e8e6b PB |
798 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
799 | struct hlist_node hash_node; | |
800 | struct async_poll *apoll; | |
801 | struct io_wq_work work; | |
2b188cc1 | 802 | }; |
05589553 | 803 | |
27dc8338 PB |
804 | struct io_defer_entry { |
805 | struct list_head list; | |
806 | struct io_kiocb *req; | |
9cf7c104 | 807 | u32 seq; |
2b188cc1 JA |
808 | }; |
809 | ||
d3656344 | 810 | struct io_op_def { |
d3656344 JA |
811 | /* needs req->file assigned */ |
812 | unsigned needs_file : 1; | |
d3656344 JA |
813 | /* hash wq insertion if file is a regular file */ |
814 | unsigned hash_reg_file : 1; | |
815 | /* unbound wq insertion if file is a non-regular file */ | |
816 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
817 | /* opcode is not supported by this kernel */ |
818 | unsigned not_supported : 1; | |
8a72758c JA |
819 | /* set if opcode supports polled "wait" */ |
820 | unsigned pollin : 1; | |
821 | unsigned pollout : 1; | |
bcda7baa JA |
822 | /* op supports buffer selection */ |
823 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
824 | /* must always have async data allocated */ |
825 | unsigned needs_async_data : 1; | |
27926b68 JA |
826 | /* should block plug */ |
827 | unsigned plug : 1; | |
e8c2bc1f JA |
828 | /* size of async data needed, if any */ |
829 | unsigned short async_size; | |
0f203765 | 830 | unsigned work_flags; |
d3656344 JA |
831 | }; |
832 | ||
0918682b | 833 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
834 | [IORING_OP_NOP] = {}, |
835 | [IORING_OP_READV] = { | |
d3656344 JA |
836 | .needs_file = 1, |
837 | .unbound_nonreg_file = 1, | |
8a72758c | 838 | .pollin = 1, |
4d954c25 | 839 | .buffer_select = 1, |
e8c2bc1f | 840 | .needs_async_data = 1, |
27926b68 | 841 | .plug = 1, |
e8c2bc1f | 842 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 843 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 844 | }, |
0463b6c5 | 845 | [IORING_OP_WRITEV] = { |
d3656344 JA |
846 | .needs_file = 1, |
847 | .hash_reg_file = 1, | |
848 | .unbound_nonreg_file = 1, | |
8a72758c | 849 | .pollout = 1, |
e8c2bc1f | 850 | .needs_async_data = 1, |
27926b68 | 851 | .plug = 1, |
e8c2bc1f | 852 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
853 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
854 | IO_WQ_WORK_FSIZE, | |
d3656344 | 855 | }, |
0463b6c5 | 856 | [IORING_OP_FSYNC] = { |
d3656344 | 857 | .needs_file = 1, |
0f203765 | 858 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 859 | }, |
0463b6c5 | 860 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
861 | .needs_file = 1, |
862 | .unbound_nonreg_file = 1, | |
8a72758c | 863 | .pollin = 1, |
27926b68 | 864 | .plug = 1, |
e8c2bc1f | 865 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 866 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 867 | }, |
0463b6c5 | 868 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
869 | .needs_file = 1, |
870 | .hash_reg_file = 1, | |
871 | .unbound_nonreg_file = 1, | |
8a72758c | 872 | .pollout = 1, |
27926b68 | 873 | .plug = 1, |
e8c2bc1f | 874 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
875 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
876 | IO_WQ_WORK_MM, | |
d3656344 | 877 | }, |
0463b6c5 | 878 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
879 | .needs_file = 1, |
880 | .unbound_nonreg_file = 1, | |
881 | }, | |
0463b6c5 PB |
882 | [IORING_OP_POLL_REMOVE] = {}, |
883 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 884 | .needs_file = 1, |
0f203765 | 885 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 886 | }, |
0463b6c5 | 887 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
888 | .needs_file = 1, |
889 | .unbound_nonreg_file = 1, | |
8a72758c | 890 | .pollout = 1, |
e8c2bc1f JA |
891 | .needs_async_data = 1, |
892 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 893 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 894 | }, |
0463b6c5 | 895 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
896 | .needs_file = 1, |
897 | .unbound_nonreg_file = 1, | |
8a72758c | 898 | .pollin = 1, |
52de1fe1 | 899 | .buffer_select = 1, |
e8c2bc1f JA |
900 | .needs_async_data = 1, |
901 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 902 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 903 | }, |
0463b6c5 | 904 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
905 | .needs_async_data = 1, |
906 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 907 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 908 | }, |
9c8e11b3 PB |
909 | [IORING_OP_TIMEOUT_REMOVE] = { |
910 | /* used by timeout updates' prep() */ | |
911 | .work_flags = IO_WQ_WORK_MM, | |
912 | }, | |
0463b6c5 | 913 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
914 | .needs_file = 1, |
915 | .unbound_nonreg_file = 1, | |
8a72758c | 916 | .pollin = 1, |
0f203765 | 917 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 918 | }, |
0463b6c5 PB |
919 | [IORING_OP_ASYNC_CANCEL] = {}, |
920 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
921 | .needs_async_data = 1, |
922 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 923 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 924 | }, |
0463b6c5 | 925 | [IORING_OP_CONNECT] = { |
d3656344 JA |
926 | .needs_file = 1, |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollout = 1, |
e8c2bc1f JA |
929 | .needs_async_data = 1, |
930 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 931 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 932 | }, |
0463b6c5 | 933 | [IORING_OP_FALLOCATE] = { |
d3656344 | 934 | .needs_file = 1, |
69228338 | 935 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 936 | }, |
0463b6c5 | 937 | [IORING_OP_OPENAT] = { |
0f203765 | 938 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 939 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 940 | }, |
0463b6c5 | 941 | [IORING_OP_CLOSE] = { |
0f203765 | 942 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 943 | }, |
0463b6c5 | 944 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 945 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 946 | }, |
0463b6c5 | 947 | [IORING_OP_STATX] = { |
0f203765 JA |
948 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
949 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 950 | }, |
0463b6c5 | 951 | [IORING_OP_READ] = { |
3a6820f2 JA |
952 | .needs_file = 1, |
953 | .unbound_nonreg_file = 1, | |
8a72758c | 954 | .pollin = 1, |
bcda7baa | 955 | .buffer_select = 1, |
27926b68 | 956 | .plug = 1, |
e8c2bc1f | 957 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 958 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 959 | }, |
0463b6c5 | 960 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
961 | .needs_file = 1, |
962 | .unbound_nonreg_file = 1, | |
8a72758c | 963 | .pollout = 1, |
27926b68 | 964 | .plug = 1, |
e8c2bc1f | 965 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
966 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
967 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 968 | }, |
0463b6c5 | 969 | [IORING_OP_FADVISE] = { |
4840e418 | 970 | .needs_file = 1, |
0f203765 | 971 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 972 | }, |
0463b6c5 | 973 | [IORING_OP_MADVISE] = { |
0f203765 | 974 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 975 | }, |
0463b6c5 | 976 | [IORING_OP_SEND] = { |
fddaface JA |
977 | .needs_file = 1, |
978 | .unbound_nonreg_file = 1, | |
8a72758c | 979 | .pollout = 1, |
0f203765 | 980 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 981 | }, |
0463b6c5 | 982 | [IORING_OP_RECV] = { |
fddaface JA |
983 | .needs_file = 1, |
984 | .unbound_nonreg_file = 1, | |
8a72758c | 985 | .pollin = 1, |
bcda7baa | 986 | .buffer_select = 1, |
0f203765 | 987 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 988 | }, |
0463b6c5 | 989 | [IORING_OP_OPENAT2] = { |
0f203765 | 990 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 991 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 992 | }, |
3e4827b0 JA |
993 | [IORING_OP_EPOLL_CTL] = { |
994 | .unbound_nonreg_file = 1, | |
0f203765 | 995 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 996 | }, |
7d67af2c PB |
997 | [IORING_OP_SPLICE] = { |
998 | .needs_file = 1, | |
999 | .hash_reg_file = 1, | |
1000 | .unbound_nonreg_file = 1, | |
0f203765 | 1001 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
1002 | }, |
1003 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1004 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1005 | [IORING_OP_TEE] = { |
1006 | .needs_file = 1, | |
1007 | .hash_reg_file = 1, | |
1008 | .unbound_nonreg_file = 1, | |
1009 | }, | |
36f4fa68 JA |
1010 | [IORING_OP_SHUTDOWN] = { |
1011 | .needs_file = 1, | |
1012 | }, | |
80a261fd JA |
1013 | [IORING_OP_RENAMEAT] = { |
1014 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
1015 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
1016 | }, | |
14a1143b JA |
1017 | [IORING_OP_UNLINKAT] = { |
1018 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
1019 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
1020 | }, | |
d3656344 JA |
1021 | }; |
1022 | ||
9936c7c2 PB |
1023 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1024 | struct task_struct *task, | |
1025 | struct files_struct *files); | |
269bbe5f | 1026 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node); |
bc9744cd | 1027 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
1ffc5422 | 1028 | struct io_ring_ctx *ctx); |
bc9744cd PB |
1029 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
1030 | struct fixed_rsrc_ref_node *ref_node); | |
1ffc5422 | 1031 | |
81b68a5c | 1032 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 1033 | unsigned int issue_flags); |
78e19bbe | 1034 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 1035 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1036 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 1037 | static void io_double_put_req(struct io_kiocb *req); |
c7dae4ba JA |
1038 | static void io_dismantle_req(struct io_kiocb *req); |
1039 | static void io_put_task(struct task_struct *task, int nr); | |
1040 | static void io_queue_next(struct io_kiocb *req); | |
94ae5e77 | 1041 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 1042 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 1043 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c | 1044 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 1045 | struct io_uring_rsrc_update *ip, |
05f3fb3c | 1046 | unsigned nr_args); |
3ca405eb | 1047 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1048 | static struct file *io_file_get(struct io_submit_state *state, |
1049 | struct io_kiocb *req, int fd, bool fixed); | |
c5eef2b9 | 1050 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1051 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1052 | |
847595de PB |
1053 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
1054 | struct iov_iter *iter, bool needs_lock); | |
ff6165b2 JA |
1055 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1056 | const struct iovec *fast_iov, | |
227c0c96 | 1057 | struct iov_iter *iter, bool force); |
907d1df3 | 1058 | static void io_req_task_queue(struct io_kiocb *req); |
65453d1e JA |
1059 | static void io_submit_flush_completions(struct io_comp_state *cs, |
1060 | struct io_ring_ctx *ctx); | |
de0617e4 | 1061 | |
2b188cc1 JA |
1062 | static struct kmem_cache *req_cachep; |
1063 | ||
0918682b | 1064 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1065 | |
1066 | struct sock *io_uring_get_socket(struct file *file) | |
1067 | { | |
1068 | #if defined(CONFIG_UNIX) | |
1069 | if (file->f_op == &io_uring_fops) { | |
1070 | struct io_ring_ctx *ctx = file->private_data; | |
1071 | ||
1072 | return ctx->ring_sock->sk; | |
1073 | } | |
1074 | #endif | |
1075 | return NULL; | |
1076 | } | |
1077 | EXPORT_SYMBOL(io_uring_get_socket); | |
1078 | ||
f2f87370 PB |
1079 | #define io_for_each_link(pos, head) \ |
1080 | for (pos = (head); pos; pos = pos->link) | |
1081 | ||
3ca405eb PB |
1082 | static inline void io_clean_op(struct io_kiocb *req) |
1083 | { | |
9d5c8190 | 1084 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
3ca405eb PB |
1085 | __io_clean_op(req); |
1086 | } | |
1087 | ||
36f72fe2 PB |
1088 | static inline void io_set_resource_node(struct io_kiocb *req) |
1089 | { | |
1090 | struct io_ring_ctx *ctx = req->ctx; | |
1091 | ||
269bbe5f BM |
1092 | if (!req->fixed_rsrc_refs) { |
1093 | req->fixed_rsrc_refs = &ctx->file_data->node->refs; | |
1094 | percpu_ref_get(req->fixed_rsrc_refs); | |
36f72fe2 PB |
1095 | } |
1096 | } | |
1097 | ||
08d23634 PB |
1098 | static bool io_match_task(struct io_kiocb *head, |
1099 | struct task_struct *task, | |
1100 | struct files_struct *files) | |
1101 | { | |
1102 | struct io_kiocb *req; | |
1103 | ||
84965ff8 JA |
1104 | if (task && head->task != task) { |
1105 | /* in terms of cancelation, always match if req task is dead */ | |
1106 | if (head->task->flags & PF_EXITING) | |
1107 | return true; | |
08d23634 | 1108 | return false; |
84965ff8 | 1109 | } |
08d23634 PB |
1110 | if (!files) |
1111 | return true; | |
1112 | ||
1113 | io_for_each_link(req, head) { | |
02a13674 JA |
1114 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1115 | continue; | |
1116 | if (req->file && req->file->f_op == &io_uring_fops) | |
1117 | return true; | |
1118 | if ((req->work.flags & IO_WQ_WORK_FILES) && | |
08d23634 PB |
1119 | req->work.identity->files == files) |
1120 | return true; | |
1121 | } | |
1122 | return false; | |
1123 | } | |
1124 | ||
28cea78a | 1125 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1126 | { |
28cea78a | 1127 | struct files_struct *files = current->files; |
c40f6379 JA |
1128 | struct mm_struct *mm = current->mm; |
1129 | ||
1130 | if (mm) { | |
1131 | kthread_unuse_mm(mm); | |
1132 | mmput(mm); | |
4b70cf9d | 1133 | current->mm = NULL; |
c40f6379 | 1134 | } |
28cea78a JA |
1135 | if (files) { |
1136 | struct nsproxy *nsproxy = current->nsproxy; | |
1137 | ||
1138 | task_lock(current); | |
1139 | current->files = NULL; | |
1140 | current->nsproxy = NULL; | |
1141 | task_unlock(current); | |
1142 | put_files_struct(files); | |
1143 | put_nsproxy(nsproxy); | |
1144 | } | |
1145 | } | |
1146 | ||
1a38ffc9 | 1147 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a | 1148 | { |
621fadc2 PB |
1149 | if (current->flags & PF_EXITING) |
1150 | return -EFAULT; | |
1151 | ||
28cea78a JA |
1152 | if (!current->files) { |
1153 | struct files_struct *files; | |
1154 | struct nsproxy *nsproxy; | |
1155 | ||
1156 | task_lock(ctx->sqo_task); | |
1157 | files = ctx->sqo_task->files; | |
1158 | if (!files) { | |
1159 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1160 | return -EOWNERDEAD; |
28cea78a JA |
1161 | } |
1162 | atomic_inc(&files->count); | |
1163 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1164 | nsproxy = ctx->sqo_task->nsproxy; | |
1165 | task_unlock(ctx->sqo_task); | |
1166 | ||
1167 | task_lock(current); | |
1168 | current->files = files; | |
1169 | current->nsproxy = nsproxy; | |
1170 | task_unlock(current); | |
1171 | } | |
1a38ffc9 | 1172 | return 0; |
c40f6379 JA |
1173 | } |
1174 | ||
1175 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1176 | { | |
4b70cf9d JA |
1177 | struct mm_struct *mm; |
1178 | ||
621fadc2 PB |
1179 | if (current->flags & PF_EXITING) |
1180 | return -EFAULT; | |
4b70cf9d JA |
1181 | if (current->mm) |
1182 | return 0; | |
1183 | ||
1184 | /* Should never happen */ | |
1185 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1186 | return -EFAULT; | |
1187 | ||
1188 | task_lock(ctx->sqo_task); | |
1189 | mm = ctx->sqo_task->mm; | |
1190 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1191 | mm = NULL; | |
1192 | task_unlock(ctx->sqo_task); | |
1193 | ||
1194 | if (mm) { | |
1195 | kthread_use_mm(mm); | |
1196 | return 0; | |
c40f6379 JA |
1197 | } |
1198 | ||
4b70cf9d | 1199 | return -EFAULT; |
c40f6379 JA |
1200 | } |
1201 | ||
28cea78a JA |
1202 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1203 | struct io_kiocb *req) | |
c40f6379 | 1204 | { |
28cea78a | 1205 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1206 | int ret; |
28cea78a JA |
1207 | |
1208 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1209 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1210 | if (unlikely(ret)) |
1211 | return ret; | |
1212 | } | |
1213 | ||
1a38ffc9 PB |
1214 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1215 | ret = __io_sq_thread_acquire_files(ctx); | |
1216 | if (unlikely(ret)) | |
1217 | return ret; | |
1218 | } | |
28cea78a JA |
1219 | |
1220 | return 0; | |
c40f6379 JA |
1221 | } |
1222 | ||
91d8f519 DZ |
1223 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1224 | struct cgroup_subsys_state **cur_css) | |
1225 | ||
1226 | { | |
1227 | #ifdef CONFIG_BLK_CGROUP | |
1228 | /* puts the old one when swapping */ | |
1229 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1230 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1231 | *cur_css = ctx->sqo_blkcg_css; | |
1232 | } | |
1233 | #endif | |
1234 | } | |
1235 | ||
1236 | static void io_sq_thread_unassociate_blkcg(void) | |
1237 | { | |
1238 | #ifdef CONFIG_BLK_CGROUP | |
1239 | kthread_associate_blkcg(NULL); | |
1240 | #endif | |
1241 | } | |
1242 | ||
c40f6379 JA |
1243 | static inline void req_set_fail_links(struct io_kiocb *req) |
1244 | { | |
1245 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1246 | req->flags |= REQ_F_FAIL_LINK; | |
1247 | } | |
4a38aed2 | 1248 | |
1e6fa521 JA |
1249 | /* |
1250 | * None of these are dereferenced, they are simply used to check if any of | |
1251 | * them have changed. If we're under current and check they are still the | |
1252 | * same, we're fine to grab references to them for actual out-of-line use. | |
1253 | */ | |
1254 | static void io_init_identity(struct io_identity *id) | |
1255 | { | |
1256 | id->files = current->files; | |
1257 | id->mm = current->mm; | |
1258 | #ifdef CONFIG_BLK_CGROUP | |
1259 | rcu_read_lock(); | |
1260 | id->blkcg_css = blkcg_css(); | |
1261 | rcu_read_unlock(); | |
1262 | #endif | |
1263 | id->creds = current_cred(); | |
1264 | id->nsproxy = current->nsproxy; | |
1265 | id->fs = current->fs; | |
1266 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1267 | #ifdef CONFIG_AUDIT |
1268 | id->loginuid = current->loginuid; | |
1269 | id->sessionid = current->sessionid; | |
1270 | #endif | |
1e6fa521 JA |
1271 | refcount_set(&id->count, 1); |
1272 | } | |
1273 | ||
ec99ca6c PB |
1274 | static inline void __io_req_init_async(struct io_kiocb *req) |
1275 | { | |
1276 | memset(&req->work, 0, sizeof(req->work)); | |
1277 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1278 | } | |
1279 | ||
7cdaf587 XW |
1280 | /* |
1281 | * Note: must call io_req_init_async() for the first time you | |
1282 | * touch any members of io_wq_work. | |
1283 | */ | |
1284 | static inline void io_req_init_async(struct io_kiocb *req) | |
1285 | { | |
500a373d JA |
1286 | struct io_uring_task *tctx = current->io_uring; |
1287 | ||
7cdaf587 XW |
1288 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1289 | return; | |
1290 | ||
ec99ca6c | 1291 | __io_req_init_async(req); |
500a373d JA |
1292 | |
1293 | /* Grab a ref if this isn't our static identity */ | |
1294 | req->work.identity = tctx->identity; | |
1295 | if (tctx->identity != &tctx->__identity) | |
1296 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1297 | } |
1298 | ||
2b188cc1 JA |
1299 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1300 | { | |
1301 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1302 | ||
0f158b4c | 1303 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1304 | } |
1305 | ||
8eb7e2d0 PB |
1306 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1307 | { | |
1308 | return !req->timeout.off; | |
1309 | } | |
1310 | ||
2b188cc1 JA |
1311 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1312 | { | |
1313 | struct io_ring_ctx *ctx; | |
78076bb6 | 1314 | int hash_bits; |
2b188cc1 JA |
1315 | |
1316 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1317 | if (!ctx) | |
1318 | return NULL; | |
1319 | ||
78076bb6 JA |
1320 | /* |
1321 | * Use 5 bits less than the max cq entries, that should give us around | |
1322 | * 32 entries per hash list if totally full and uniformly spread. | |
1323 | */ | |
1324 | hash_bits = ilog2(p->cq_entries); | |
1325 | hash_bits -= 5; | |
1326 | if (hash_bits <= 0) | |
1327 | hash_bits = 1; | |
1328 | ctx->cancel_hash_bits = hash_bits; | |
1329 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1330 | GFP_KERNEL); | |
1331 | if (!ctx->cancel_hash) | |
1332 | goto err; | |
1333 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1334 | ||
21482896 | 1335 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1336 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1337 | goto err; | |
2b188cc1 JA |
1338 | |
1339 | ctx->flags = p->flags; | |
90554200 | 1340 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1341 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1342 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1343 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1344 | init_completion(&ctx->ref_comp); |
1345 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1346 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1347 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1348 | mutex_init(&ctx->uring_lock); |
1349 | init_waitqueue_head(&ctx->wait); | |
1350 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1351 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1352 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1353 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1354 | spin_lock_init(&ctx->inflight_lock); |
1355 | INIT_LIST_HEAD(&ctx->inflight_list); | |
d67d2263 BM |
1356 | spin_lock_init(&ctx->rsrc_ref_lock); |
1357 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1358 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1359 | init_llist_head(&ctx->rsrc_put_llist); | |
1b4c351f | 1360 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
c7dae4ba | 1361 | INIT_LIST_HEAD(&ctx->submit_state.comp.locked_free_list); |
2b188cc1 | 1362 | return ctx; |
206aefde | 1363 | err: |
78076bb6 | 1364 | kfree(ctx->cancel_hash); |
206aefde JA |
1365 | kfree(ctx); |
1366 | return NULL; | |
2b188cc1 JA |
1367 | } |
1368 | ||
9cf7c104 | 1369 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1370 | { |
2bc9930e JA |
1371 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1372 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1373 | |
9cf7c104 | 1374 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1375 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1376 | } |
de0617e4 | 1377 | |
9d858b21 | 1378 | return false; |
de0617e4 JA |
1379 | } |
1380 | ||
5c3462cf | 1381 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1382 | { |
500a373d | 1383 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1384 | return; |
1385 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1386 | kfree(req->work.identity); | |
1387 | } | |
1388 | ||
4edf20f9 | 1389 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1390 | { |
7cdaf587 | 1391 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1392 | return; |
51a4cc11 | 1393 | |
e86d0047 | 1394 | if (req->work.flags & IO_WQ_WORK_MM) |
98447d65 | 1395 | mmdrop(req->work.identity->mm); |
91d8f519 | 1396 | #ifdef CONFIG_BLK_CGROUP |
e86d0047 | 1397 | if (req->work.flags & IO_WQ_WORK_BLKCG) |
98447d65 | 1398 | css_put(req->work.identity->blkcg_css); |
91d8f519 | 1399 | #endif |
e86d0047 | 1400 | if (req->work.flags & IO_WQ_WORK_CREDS) |
98447d65 | 1401 | put_cred(req->work.identity->creds); |
dfead8a8 | 1402 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1403 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1404 | |
98447d65 | 1405 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1406 | if (--fs->users) |
1407 | fs = NULL; | |
98447d65 | 1408 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1409 | if (fs) |
1410 | free_fs_struct(fs); | |
1411 | } | |
34e08fed PB |
1412 | if (req->work.flags & IO_WQ_WORK_FILES) { |
1413 | put_files_struct(req->work.identity->files); | |
1414 | put_nsproxy(req->work.identity->nsproxy); | |
34e08fed PB |
1415 | } |
1416 | if (req->flags & REQ_F_INFLIGHT) { | |
1417 | struct io_ring_ctx *ctx = req->ctx; | |
1418 | struct io_uring_task *tctx = req->task->io_uring; | |
1419 | unsigned long flags; | |
1420 | ||
1421 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1422 | list_del(&req->inflight_entry); | |
1423 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1424 | req->flags &= ~REQ_F_INFLIGHT; | |
1425 | if (atomic_read(&tctx->in_idle)) | |
1426 | wake_up(&tctx->wait); | |
1427 | } | |
51a4cc11 | 1428 | |
e86d0047 PB |
1429 | req->flags &= ~REQ_F_WORK_INITIALIZED; |
1430 | req->work.flags &= ~(IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | IO_WQ_WORK_FS | | |
1431 | IO_WQ_WORK_CREDS | IO_WQ_WORK_FILES); | |
5c3462cf | 1432 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1433 | } |
1434 | ||
1e6fa521 JA |
1435 | /* |
1436 | * Create a private copy of io_identity, since some fields don't match | |
1437 | * the current context. | |
1438 | */ | |
1439 | static bool io_identity_cow(struct io_kiocb *req) | |
1440 | { | |
5c3462cf | 1441 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1442 | const struct cred *creds = NULL; |
1443 | struct io_identity *id; | |
1444 | ||
1445 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1446 | creds = req->work.identity->creds; | |
1447 | ||
1448 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1449 | if (unlikely(!id)) { | |
1450 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1451 | return false; | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * We can safely just re-init the creds we copied Either the field | |
1456 | * matches the current one, or we haven't grabbed it yet. The only | |
1457 | * exception is ->creds, through registered personalities, so handle | |
1458 | * that one separately. | |
1459 | */ | |
1460 | io_init_identity(id); | |
1461 | if (creds) | |
e8c954df | 1462 | id->creds = creds; |
1e6fa521 JA |
1463 | |
1464 | /* add one for this request */ | |
1465 | refcount_inc(&id->count); | |
1466 | ||
cb8a8ae3 JA |
1467 | /* drop tctx and req identity references, if needed */ |
1468 | if (tctx->identity != &tctx->__identity && | |
1469 | refcount_dec_and_test(&tctx->identity->count)) | |
1470 | kfree(tctx->identity); | |
1471 | if (req->work.identity != &tctx->__identity && | |
1472 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1473 | kfree(req->work.identity); |
1474 | ||
1475 | req->work.identity = id; | |
500a373d | 1476 | tctx->identity = id; |
1e6fa521 JA |
1477 | return true; |
1478 | } | |
1479 | ||
ce3d5aae PB |
1480 | static void io_req_track_inflight(struct io_kiocb *req) |
1481 | { | |
1482 | struct io_ring_ctx *ctx = req->ctx; | |
1483 | ||
1484 | if (!(req->flags & REQ_F_INFLIGHT)) { | |
1485 | io_req_init_async(req); | |
1486 | req->flags |= REQ_F_INFLIGHT; | |
1487 | ||
1488 | spin_lock_irq(&ctx->inflight_lock); | |
1489 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1490 | spin_unlock_irq(&ctx->inflight_lock); | |
1491 | } | |
1492 | } | |
1493 | ||
1e6fa521 | 1494 | static bool io_grab_identity(struct io_kiocb *req) |
18d9be1a | 1495 | { |
d3656344 | 1496 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1497 | struct io_identity *id = req->work.identity; |
54a91f3b | 1498 | |
69228338 JA |
1499 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1500 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1501 | return false; | |
1502 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1503 | } | |
91d8f519 | 1504 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1505 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1506 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1507 | rcu_read_lock(); |
1e6fa521 JA |
1508 | if (id->blkcg_css != blkcg_css()) { |
1509 | rcu_read_unlock(); | |
1510 | return false; | |
1511 | } | |
91d8f519 DZ |
1512 | /* |
1513 | * This should be rare, either the cgroup is dying or the task | |
1514 | * is moving cgroups. Just punt to root for the handful of ios. | |
1515 | */ | |
1e6fa521 | 1516 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1517 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1518 | rcu_read_unlock(); |
1519 | } | |
1520 | #endif | |
dfead8a8 | 1521 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1522 | if (id->creds != current_cred()) |
1523 | return false; | |
1524 | get_cred(id->creds); | |
dfead8a8 JA |
1525 | req->work.flags |= IO_WQ_WORK_CREDS; |
1526 | } | |
4ea33a97 JA |
1527 | #ifdef CONFIG_AUDIT |
1528 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1529 | current->sessionid != id->sessionid) | |
1530 | return false; | |
1531 | #endif | |
dfead8a8 JA |
1532 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1533 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1534 | if (current->fs != id->fs) |
1535 | return false; | |
1536 | spin_lock(&id->fs->lock); | |
1537 | if (!id->fs->in_exec) { | |
1538 | id->fs->users++; | |
dfead8a8 | 1539 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1540 | } else { |
1541 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1542 | } | |
1543 | spin_unlock(¤t->fs->lock); | |
1544 | } | |
af604703 PB |
1545 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1546 | (def->work_flags & IO_WQ_WORK_FILES) && | |
1547 | !(req->flags & REQ_F_NO_FILE_TABLE)) { | |
1548 | if (id->files != current->files || | |
1549 | id->nsproxy != current->nsproxy) | |
1550 | return false; | |
1551 | atomic_inc(&id->files->count); | |
1552 | get_nsproxy(id->nsproxy); | |
af604703 | 1553 | req->work.flags |= IO_WQ_WORK_FILES; |
ce3d5aae | 1554 | io_req_track_inflight(req); |
af604703 | 1555 | } |
77788775 JA |
1556 | if (!(req->work.flags & IO_WQ_WORK_MM) && |
1557 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1558 | if (id->mm != current->mm) | |
1559 | return false; | |
1560 | mmgrab(id->mm); | |
1561 | req->work.flags |= IO_WQ_WORK_MM; | |
1562 | } | |
1e6fa521 JA |
1563 | |
1564 | return true; | |
1565 | } | |
1566 | ||
1567 | static void io_prep_async_work(struct io_kiocb *req) | |
1568 | { | |
1569 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1570 | struct io_ring_ctx *ctx = req->ctx; |
1571 | ||
1572 | io_req_init_async(req); | |
1573 | ||
feaadc4f PB |
1574 | if (req->flags & REQ_F_FORCE_ASYNC) |
1575 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1576 | ||
1e6fa521 JA |
1577 | if (req->flags & REQ_F_ISREG) { |
1578 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1579 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1580 | } else { | |
1581 | if (def->unbound_nonreg_file) | |
1582 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1583 | } | |
1584 | ||
1e6fa521 JA |
1585 | /* if we fail grabbing identity, we must COW, regrab, and retry */ |
1586 | if (io_grab_identity(req)) | |
1587 | return; | |
1588 | ||
1589 | if (!io_identity_cow(req)) | |
1590 | return; | |
1591 | ||
1592 | /* can't fail at this point */ | |
1593 | if (!io_grab_identity(req)) | |
1594 | WARN_ON(1); | |
561fb04a | 1595 | } |
cccf0ee8 | 1596 | |
cbdcb435 | 1597 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1598 | { |
cbdcb435 | 1599 | struct io_kiocb *cur; |
54a91f3b | 1600 | |
f2f87370 PB |
1601 | io_for_each_link(cur, req) |
1602 | io_prep_async_work(cur); | |
561fb04a JA |
1603 | } |
1604 | ||
7271ef3a | 1605 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1606 | { |
a197f664 | 1607 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1608 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1609 | |
8766dd51 PB |
1610 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1611 | &req->work, req->flags); | |
1612 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1613 | return link; |
18d9be1a JA |
1614 | } |
1615 | ||
cbdcb435 PB |
1616 | static void io_queue_async_work(struct io_kiocb *req) |
1617 | { | |
7271ef3a JA |
1618 | struct io_kiocb *link; |
1619 | ||
cbdcb435 PB |
1620 | /* init ->work of the whole link before punting */ |
1621 | io_prep_async_link(req); | |
7271ef3a JA |
1622 | link = __io_queue_async_work(req); |
1623 | ||
1624 | if (link) | |
1625 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1626 | } |
1627 | ||
5262f567 JA |
1628 | static void io_kill_timeout(struct io_kiocb *req) |
1629 | { | |
e8c2bc1f | 1630 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1631 | int ret; |
1632 | ||
e8c2bc1f | 1633 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1634 | if (ret != -1) { |
01cec8c1 PB |
1635 | atomic_set(&req->ctx->cq_timeouts, |
1636 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1637 | list_del_init(&req->timeout.list); |
78e19bbe | 1638 | io_cqring_fill_event(req, 0); |
216578e5 | 1639 | io_put_req_deferred(req, 1); |
5262f567 JA |
1640 | } |
1641 | } | |
1642 | ||
76e1b642 JA |
1643 | /* |
1644 | * Returns true if we found and killed one or more timeouts | |
1645 | */ | |
6b81928d PB |
1646 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1647 | struct files_struct *files) | |
5262f567 JA |
1648 | { |
1649 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1650 | int canceled = 0; |
5262f567 JA |
1651 | |
1652 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1653 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1654 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1655 | io_kill_timeout(req); |
76e1b642 JA |
1656 | canceled++; |
1657 | } | |
f3606e3a | 1658 | } |
5262f567 | 1659 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1660 | return canceled != 0; |
5262f567 JA |
1661 | } |
1662 | ||
04518945 | 1663 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1664 | { |
04518945 | 1665 | do { |
27dc8338 PB |
1666 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1667 | struct io_defer_entry, list); | |
de0617e4 | 1668 | |
9cf7c104 | 1669 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1670 | break; |
27dc8338 | 1671 | list_del_init(&de->list); |
907d1df3 | 1672 | io_req_task_queue(de->req); |
27dc8338 | 1673 | kfree(de); |
04518945 PB |
1674 | } while (!list_empty(&ctx->defer_list)); |
1675 | } | |
1676 | ||
360428f8 | 1677 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1678 | { |
f010505b MDG |
1679 | u32 seq; |
1680 | ||
1681 | if (list_empty(&ctx->timeout_list)) | |
1682 | return; | |
1683 | ||
1684 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
1685 | ||
1686 | do { | |
1687 | u32 events_needed, events_got; | |
360428f8 | 1688 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1689 | struct io_kiocb, timeout.list); |
de0617e4 | 1690 | |
8eb7e2d0 | 1691 | if (io_is_timeout_noseq(req)) |
360428f8 | 1692 | break; |
f010505b MDG |
1693 | |
1694 | /* | |
1695 | * Since seq can easily wrap around over time, subtract | |
1696 | * the last seq at which timeouts were flushed before comparing. | |
1697 | * Assuming not more than 2^31-1 events have happened since, | |
1698 | * these subtractions won't have wrapped, so we can check if | |
1699 | * target is in [last_seq, current_seq] by comparing the two. | |
1700 | */ | |
1701 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1702 | events_got = seq - ctx->cq_last_tm_flush; | |
1703 | if (events_got < events_needed) | |
360428f8 | 1704 | break; |
bfe68a22 | 1705 | |
135fcde8 | 1706 | list_del_init(&req->timeout.list); |
5262f567 | 1707 | io_kill_timeout(req); |
f010505b MDG |
1708 | } while (!list_empty(&ctx->timeout_list)); |
1709 | ||
1710 | ctx->cq_last_tm_flush = seq; | |
360428f8 | 1711 | } |
5262f567 | 1712 | |
360428f8 PB |
1713 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1714 | { | |
1715 | io_flush_timeouts(ctx); | |
ec30e04b PB |
1716 | |
1717 | /* order cqe stores with ring update */ | |
1718 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 | 1719 | |
04518945 PB |
1720 | if (unlikely(!list_empty(&ctx->defer_list))) |
1721 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1722 | } |
1723 | ||
90554200 JA |
1724 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1725 | { | |
1726 | struct io_rings *r = ctx->rings; | |
1727 | ||
1728 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1729 | } | |
1730 | ||
888aae2e PB |
1731 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1732 | { | |
1733 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1734 | } | |
1735 | ||
2b188cc1 JA |
1736 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1737 | { | |
75b28aff | 1738 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1739 | unsigned tail; |
1740 | ||
115e12e5 SB |
1741 | /* |
1742 | * writes to the cq entry need to come after reading head; the | |
1743 | * control dependency is enough as we're using WRITE_ONCE to | |
1744 | * fill the cq entry | |
1745 | */ | |
888aae2e | 1746 | if (__io_cqring_events(ctx) == rings->cq_ring_entries) |
2b188cc1 JA |
1747 | return NULL; |
1748 | ||
888aae2e | 1749 | tail = ctx->cached_cq_tail++; |
75b28aff | 1750 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1751 | } |
1752 | ||
f2842ab5 JA |
1753 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1754 | { | |
f0b493e6 JA |
1755 | if (!ctx->cq_ev_fd) |
1756 | return false; | |
7e55a19c SG |
1757 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1758 | return false; | |
f2842ab5 JA |
1759 | if (!ctx->eventfd_async) |
1760 | return true; | |
b41e9852 | 1761 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1762 | } |
1763 | ||
b41e9852 | 1764 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1765 | { |
b1445e59 PB |
1766 | /* see waitqueue_active() comment */ |
1767 | smp_mb(); | |
1768 | ||
1d7bb1d5 JA |
1769 | if (waitqueue_active(&ctx->wait)) |
1770 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1771 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1772 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1773 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1774 | eventfd_signal(ctx->cq_ev_fd, 1); |
b1445e59 | 1775 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1776 | wake_up_interruptible(&ctx->cq_wait); |
1777 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1778 | } | |
1d7bb1d5 JA |
1779 | } |
1780 | ||
80c18e4a PB |
1781 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1782 | { | |
b1445e59 PB |
1783 | /* see waitqueue_active() comment */ |
1784 | smp_mb(); | |
1785 | ||
80c18e4a PB |
1786 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1787 | if (waitqueue_active(&ctx->wait)) | |
1788 | wake_up(&ctx->wait); | |
1789 | } | |
1790 | if (io_should_trigger_evfd(ctx)) | |
1791 | eventfd_signal(ctx->cq_ev_fd, 1); | |
b1445e59 | 1792 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1793 | wake_up_interruptible(&ctx->cq_wait); |
1794 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1795 | } | |
80c18e4a PB |
1796 | } |
1797 | ||
c4a2ed72 | 1798 | /* Returns true if there are no backlogged entries after the flush */ |
6c503150 PB |
1799 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1800 | struct task_struct *tsk, | |
1801 | struct files_struct *files) | |
1d7bb1d5 JA |
1802 | { |
1803 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1804 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1805 | struct io_uring_cqe *cqe; |
1d7bb1d5 | 1806 | unsigned long flags; |
b18032bb | 1807 | bool all_flushed, posted; |
1d7bb1d5 JA |
1808 | LIST_HEAD(list); |
1809 | ||
e23de15f PB |
1810 | if (!force && __io_cqring_events(ctx) == rings->cq_ring_entries) |
1811 | return false; | |
1d7bb1d5 | 1812 | |
b18032bb | 1813 | posted = false; |
1d7bb1d5 | 1814 | spin_lock_irqsave(&ctx->completion_lock, flags); |
e6c8aa9a | 1815 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1816 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1817 | continue; |
1818 | ||
1d7bb1d5 JA |
1819 | cqe = io_get_cqring(ctx); |
1820 | if (!cqe && !force) | |
1821 | break; | |
1822 | ||
40d8ddd4 | 1823 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1824 | if (cqe) { |
1825 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1826 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1827 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1828 | } else { |
2c3bac6d | 1829 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1830 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1831 | ctx->cached_cq_overflow); |
1d7bb1d5 | 1832 | } |
b18032bb | 1833 | posted = true; |
1d7bb1d5 JA |
1834 | } |
1835 | ||
09e88404 PB |
1836 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1837 | if (all_flushed) { | |
1838 | clear_bit(0, &ctx->sq_check_overflow); | |
1839 | clear_bit(0, &ctx->cq_check_overflow); | |
1840 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1841 | } | |
46930143 | 1842 | |
b18032bb JA |
1843 | if (posted) |
1844 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1845 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1846 | if (posted) |
1847 | io_cqring_ev_posted(ctx); | |
1d7bb1d5 JA |
1848 | |
1849 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1850 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1851 | list_del(&req->compl.list); | |
ec9c02ad | 1852 | io_put_req(req); |
1d7bb1d5 | 1853 | } |
c4a2ed72 | 1854 | |
09e88404 | 1855 | return all_flushed; |
1d7bb1d5 JA |
1856 | } |
1857 | ||
6c503150 PB |
1858 | static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1859 | struct task_struct *tsk, | |
1860 | struct files_struct *files) | |
1861 | { | |
1862 | if (test_bit(0, &ctx->cq_check_overflow)) { | |
1863 | /* iopoll syncs against uring_lock, not completion_lock */ | |
1864 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1865 | mutex_lock(&ctx->uring_lock); | |
1866 | __io_cqring_overflow_flush(ctx, force, tsk, files); | |
1867 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1868 | mutex_unlock(&ctx->uring_lock); | |
1869 | } | |
1870 | } | |
1871 | ||
bcda7baa | 1872 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1873 | { |
78e19bbe | 1874 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1875 | struct io_uring_cqe *cqe; |
1876 | ||
78e19bbe | 1877 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1878 | |
2b188cc1 JA |
1879 | /* |
1880 | * If we can't get a cq entry, userspace overflowed the | |
1881 | * submission (by quite a lot). Increment the overflow count in | |
1882 | * the ring. | |
1883 | */ | |
1884 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1885 | if (likely(cqe)) { |
78e19bbe | 1886 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1887 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1888 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1889 | } else if (ctx->cq_overflow_flushed || |
1890 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1891 | /* |
1892 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1893 | * then we cannot store the request for later flushing, we need | |
1894 | * to drop it on the floor. | |
1895 | */ | |
2c3bac6d PB |
1896 | ctx->cached_cq_overflow++; |
1897 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1898 | } else { |
ad3eb2c8 JA |
1899 | if (list_empty(&ctx->cq_overflow_list)) { |
1900 | set_bit(0, &ctx->sq_check_overflow); | |
1901 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1902 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1903 | } |
40d8ddd4 | 1904 | io_clean_op(req); |
1d7bb1d5 | 1905 | req->result = res; |
0f7e466b | 1906 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1907 | refcount_inc(&req->refs); |
1908 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1909 | } |
1910 | } | |
1911 | ||
bcda7baa JA |
1912 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1913 | { | |
1914 | __io_cqring_fill_event(req, res, 0); | |
1915 | } | |
1916 | ||
c7dae4ba JA |
1917 | static inline void io_req_complete_post(struct io_kiocb *req, long res, |
1918 | unsigned int cflags) | |
2b188cc1 | 1919 | { |
78e19bbe | 1920 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1921 | unsigned long flags; |
1922 | ||
1923 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1924 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 | 1925 | io_commit_cqring(ctx); |
c7dae4ba JA |
1926 | /* |
1927 | * If we're the last reference to this request, add to our locked | |
1928 | * free_list cache. | |
1929 | */ | |
1930 | if (refcount_dec_and_test(&req->refs)) { | |
1931 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
1932 | ||
1933 | io_dismantle_req(req); | |
1934 | io_put_task(req->task, 1); | |
1935 | list_add(&req->compl.list, &cs->locked_free_list); | |
1936 | cs->locked_free_nr++; | |
1937 | } else | |
1938 | req = NULL; | |
2b188cc1 JA |
1939 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1940 | ||
8c838788 | 1941 | io_cqring_ev_posted(ctx); |
c7dae4ba JA |
1942 | if (req) { |
1943 | io_queue_next(req); | |
1944 | percpu_ref_put(&ctx->refs); | |
1945 | } | |
2b188cc1 JA |
1946 | } |
1947 | ||
a38d68db | 1948 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1949 | unsigned int cflags) |
229a7b63 | 1950 | { |
a38d68db PB |
1951 | io_clean_op(req); |
1952 | req->result = res; | |
1953 | req->compl.cflags = cflags; | |
e342c807 | 1954 | req->flags |= REQ_F_COMPLETE_INLINE; |
a38d68db PB |
1955 | } |
1956 | ||
889fca73 PB |
1957 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1958 | long res, unsigned cflags) | |
a38d68db | 1959 | { |
889fca73 PB |
1960 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1961 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1962 | else |
c7dae4ba | 1963 | io_req_complete_post(req, res, cflags); |
e1e16097 JA |
1964 | } |
1965 | ||
a38d68db | 1966 | static inline void io_req_complete(struct io_kiocb *req, long res) |
bcda7baa | 1967 | { |
889fca73 | 1968 | __io_req_complete(req, 0, res, 0); |
bcda7baa JA |
1969 | } |
1970 | ||
c7dae4ba | 1971 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
2b188cc1 | 1972 | { |
c7dae4ba JA |
1973 | struct io_submit_state *state = &ctx->submit_state; |
1974 | struct io_comp_state *cs = &state->comp; | |
e5d1bc0a | 1975 | struct io_kiocb *req = NULL; |
1b4c351f | 1976 | |
c7dae4ba JA |
1977 | /* |
1978 | * If we have more than a batch's worth of requests in our IRQ side | |
1979 | * locked cache, grab the lock and move them over to our submission | |
1980 | * side cache. | |
1981 | */ | |
1982 | if (READ_ONCE(cs->locked_free_nr) > IO_COMPL_BATCH) { | |
1983 | spin_lock_irq(&ctx->completion_lock); | |
1984 | list_splice_init(&cs->locked_free_list, &cs->free_list); | |
1985 | cs->locked_free_nr = 0; | |
1986 | spin_unlock_irq(&ctx->completion_lock); | |
1987 | } | |
1988 | ||
1989 | while (!list_empty(&cs->free_list)) { | |
1990 | req = list_first_entry(&cs->free_list, struct io_kiocb, | |
1b4c351f JA |
1991 | compl.list); |
1992 | list_del(&req->compl.list); | |
e5d1bc0a PB |
1993 | state->reqs[state->free_reqs++] = req; |
1994 | if (state->free_reqs == ARRAY_SIZE(state->reqs)) | |
1995 | break; | |
1b4c351f JA |
1996 | } |
1997 | ||
e5d1bc0a PB |
1998 | return req != NULL; |
1999 | } | |
2000 | ||
2001 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2002 | { | |
2003 | struct io_submit_state *state = &ctx->submit_state; | |
2004 | ||
2005 | BUILD_BUG_ON(IO_REQ_ALLOC_BATCH > ARRAY_SIZE(state->reqs)); | |
2006 | ||
f6b6c7d6 | 2007 | if (!state->free_reqs) { |
291b2821 | 2008 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
2009 | int ret; |
2010 | ||
c7dae4ba | 2011 | if (io_flush_cached_reqs(ctx)) |
e5d1bc0a PB |
2012 | goto got_req; |
2013 | ||
bf019da7 PB |
2014 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
2015 | state->reqs); | |
fd6fab2c JA |
2016 | |
2017 | /* | |
2018 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2019 | * retry single alloc to be on the safe side. | |
2020 | */ | |
2021 | if (unlikely(ret <= 0)) { | |
2022 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
2023 | if (!state->reqs[0]) | |
3893f39f | 2024 | return NULL; |
fd6fab2c JA |
2025 | ret = 1; |
2026 | } | |
291b2821 | 2027 | state->free_reqs = ret; |
2b188cc1 | 2028 | } |
e5d1bc0a | 2029 | got_req: |
291b2821 PB |
2030 | state->free_reqs--; |
2031 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
2032 | } |
2033 | ||
8da11c19 PB |
2034 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
2035 | bool fixed) | |
2036 | { | |
36f72fe2 | 2037 | if (!fixed) |
8da11c19 PB |
2038 | fput(file); |
2039 | } | |
2040 | ||
4edf20f9 | 2041 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2042 | { |
3ca405eb | 2043 | io_clean_op(req); |
929a3af9 | 2044 | |
e8c2bc1f JA |
2045 | if (req->async_data) |
2046 | kfree(req->async_data); | |
8da11c19 PB |
2047 | if (req->file) |
2048 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
269bbe5f BM |
2049 | if (req->fixed_rsrc_refs) |
2050 | percpu_ref_put(req->fixed_rsrc_refs); | |
4edf20f9 | 2051 | io_req_clean_work(req); |
e65ef56d JA |
2052 | } |
2053 | ||
7c660731 PB |
2054 | static inline void io_put_task(struct task_struct *task, int nr) |
2055 | { | |
2056 | struct io_uring_task *tctx = task->io_uring; | |
2057 | ||
2058 | percpu_counter_sub(&tctx->inflight, nr); | |
2059 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2060 | wake_up(&tctx->wait); | |
2061 | put_task_struct_many(task, nr); | |
2062 | } | |
2063 | ||
216578e5 | 2064 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2065 | { |
51a4cc11 | 2066 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2067 | |
216578e5 | 2068 | io_dismantle_req(req); |
7c660731 | 2069 | io_put_task(req->task, 1); |
e3bc8e9d | 2070 | |
3893f39f | 2071 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 2072 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
2073 | } |
2074 | ||
f2f87370 PB |
2075 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2076 | { | |
2077 | struct io_kiocb *nxt = req->link; | |
2078 | ||
2079 | req->link = nxt->link; | |
2080 | nxt->link = NULL; | |
2081 | } | |
2082 | ||
c9abd7ad | 2083 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 2084 | { |
a197f664 | 2085 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 2086 | struct io_kiocb *link; |
c9abd7ad PB |
2087 | bool cancelled = false; |
2088 | unsigned long flags; | |
7c86ffee | 2089 | |
c9abd7ad | 2090 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2091 | link = req->link; |
2092 | ||
900fad45 PB |
2093 | /* |
2094 | * Can happen if a linked timeout fired and link had been like | |
2095 | * req -> link t-out -> link t-out [-> ...] | |
2096 | */ | |
c9abd7ad PB |
2097 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
2098 | struct io_timeout_data *io = link->async_data; | |
2099 | int ret; | |
7c86ffee | 2100 | |
f2f87370 | 2101 | io_remove_next_linked(req); |
90cd7e42 | 2102 | link->timeout.head = NULL; |
c9abd7ad PB |
2103 | ret = hrtimer_try_to_cancel(&io->timer); |
2104 | if (ret != -1) { | |
2105 | io_cqring_fill_event(link, -ECANCELED); | |
2106 | io_commit_cqring(ctx); | |
2107 | cancelled = true; | |
2108 | } | |
2109 | } | |
7c86ffee | 2110 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 2111 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 2112 | |
c9abd7ad | 2113 | if (cancelled) { |
7c86ffee | 2114 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2115 | io_put_req(link); |
2116 | } | |
7c86ffee PB |
2117 | } |
2118 | ||
9e645e11 | 2119 | |
d148ca4b | 2120 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2121 | { |
f2f87370 | 2122 | struct io_kiocb *link, *nxt; |
2665abfd | 2123 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2124 | unsigned long flags; |
9e645e11 | 2125 | |
d148ca4b | 2126 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2127 | link = req->link; |
2128 | req->link = NULL; | |
9e645e11 | 2129 | |
f2f87370 PB |
2130 | while (link) { |
2131 | nxt = link->link; | |
2132 | link->link = NULL; | |
2665abfd | 2133 | |
f2f87370 | 2134 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2135 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2136 | |
2137 | /* | |
2138 | * It's ok to free under spinlock as they're not linked anymore, | |
2139 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2140 | * work.fs->lock. | |
2141 | */ | |
2142 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2143 | io_put_req_deferred(link, 2); | |
2144 | else | |
2145 | io_double_put_req(link); | |
f2f87370 | 2146 | link = nxt; |
9e645e11 | 2147 | } |
2665abfd | 2148 | io_commit_cqring(ctx); |
216578e5 | 2149 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2150 | |
2665abfd | 2151 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2152 | } |
2153 | ||
3fa5e0f3 | 2154 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2155 | { |
7c86ffee PB |
2156 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2157 | io_kill_linked_timeout(req); | |
944e58bf | 2158 | |
9e645e11 JA |
2159 | /* |
2160 | * If LINK is set, we have dependent requests in this chain. If we | |
2161 | * didn't fail this request, queue the first one up, moving any other | |
2162 | * dependencies to the next request. In case of failure, fail the rest | |
2163 | * of the chain. | |
2164 | */ | |
f2f87370 PB |
2165 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2166 | struct io_kiocb *nxt = req->link; | |
2167 | ||
2168 | req->link = NULL; | |
2169 | return nxt; | |
2170 | } | |
9b5f7bd9 PB |
2171 | io_fail_links(req); |
2172 | return NULL; | |
4d7dd462 | 2173 | } |
9e645e11 | 2174 | |
f2f87370 | 2175 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2176 | { |
f2f87370 | 2177 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2178 | return NULL; |
2179 | return __io_req_find_next(req); | |
2180 | } | |
2181 | ||
7cbf1722 JA |
2182 | static bool __tctx_task_work(struct io_uring_task *tctx) |
2183 | { | |
65453d1e | 2184 | struct io_ring_ctx *ctx = NULL; |
7cbf1722 JA |
2185 | struct io_wq_work_list list; |
2186 | struct io_wq_work_node *node; | |
2187 | ||
2188 | if (wq_list_empty(&tctx->task_list)) | |
2189 | return false; | |
2190 | ||
2191 | spin_lock(&tctx->task_lock); | |
2192 | list = tctx->task_list; | |
2193 | INIT_WQ_LIST(&tctx->task_list); | |
2194 | spin_unlock(&tctx->task_lock); | |
2195 | ||
2196 | node = list.first; | |
2197 | while (node) { | |
2198 | struct io_wq_work_node *next = node->next; | |
65453d1e | 2199 | struct io_ring_ctx *this_ctx; |
7cbf1722 JA |
2200 | struct io_kiocb *req; |
2201 | ||
2202 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
65453d1e | 2203 | this_ctx = req->ctx; |
7cbf1722 JA |
2204 | req->task_work.func(&req->task_work); |
2205 | node = next; | |
65453d1e JA |
2206 | |
2207 | if (!ctx) { | |
2208 | ctx = this_ctx; | |
2209 | } else if (ctx != this_ctx) { | |
2210 | mutex_lock(&ctx->uring_lock); | |
2211 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2212 | mutex_unlock(&ctx->uring_lock); | |
2213 | ctx = this_ctx; | |
2214 | } | |
2215 | } | |
2216 | ||
2217 | if (ctx && ctx->submit_state.comp.nr) { | |
2218 | mutex_lock(&ctx->uring_lock); | |
2219 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2220 | mutex_unlock(&ctx->uring_lock); | |
7cbf1722 JA |
2221 | } |
2222 | ||
2223 | return list.first != NULL; | |
2224 | } | |
2225 | ||
2226 | static void tctx_task_work(struct callback_head *cb) | |
2227 | { | |
2228 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, task_work); | |
2229 | ||
2230 | while (__tctx_task_work(tctx)) | |
2231 | cond_resched(); | |
2232 | ||
2233 | clear_bit(0, &tctx->task_state); | |
2234 | } | |
2235 | ||
2236 | static int io_task_work_add(struct task_struct *tsk, struct io_kiocb *req, | |
2237 | enum task_work_notify_mode notify) | |
2238 | { | |
2239 | struct io_uring_task *tctx = tsk->io_uring; | |
2240 | struct io_wq_work_node *node, *prev; | |
2241 | int ret; | |
2242 | ||
2243 | WARN_ON_ONCE(!tctx); | |
2244 | ||
2245 | spin_lock(&tctx->task_lock); | |
2246 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
2247 | spin_unlock(&tctx->task_lock); | |
2248 | ||
2249 | /* task_work already pending, we're done */ | |
2250 | if (test_bit(0, &tctx->task_state) || | |
2251 | test_and_set_bit(0, &tctx->task_state)) | |
2252 | return 0; | |
2253 | ||
2254 | if (!task_work_add(tsk, &tctx->task_work, notify)) | |
2255 | return 0; | |
2256 | ||
2257 | /* | |
2258 | * Slow path - we failed, find and delete work. if the work is not | |
2259 | * in the list, it got run and we're fine. | |
2260 | */ | |
2261 | ret = 0; | |
2262 | spin_lock(&tctx->task_lock); | |
2263 | wq_list_for_each(node, prev, &tctx->task_list) { | |
2264 | if (&req->io_task_work.node == node) { | |
2265 | wq_list_del(&tctx->task_list, node, prev); | |
2266 | ret = 1; | |
2267 | break; | |
2268 | } | |
2269 | } | |
2270 | spin_unlock(&tctx->task_lock); | |
2271 | clear_bit(0, &tctx->task_state); | |
2272 | return ret; | |
2273 | } | |
2274 | ||
355fb9e2 | 2275 | static int io_req_task_work_add(struct io_kiocb *req) |
c2c4c83c JA |
2276 | { |
2277 | struct task_struct *tsk = req->task; | |
2278 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2279 | enum task_work_notify_mode notify; |
2280 | int ret; | |
c2c4c83c | 2281 | |
6200b0ae JA |
2282 | if (tsk->flags & PF_EXITING) |
2283 | return -ESRCH; | |
2284 | ||
c2c4c83c | 2285 | /* |
0ba9c9ed JA |
2286 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2287 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2288 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2289 | * will do the job. | |
c2c4c83c | 2290 | */ |
91989c70 | 2291 | notify = TWA_NONE; |
355fb9e2 | 2292 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) |
c2c4c83c JA |
2293 | notify = TWA_SIGNAL; |
2294 | ||
7cbf1722 | 2295 | ret = io_task_work_add(tsk, req, notify); |
c2c4c83c JA |
2296 | if (!ret) |
2297 | wake_up_process(tsk); | |
0ba9c9ed | 2298 | |
c2c4c83c JA |
2299 | return ret; |
2300 | } | |
2301 | ||
eab30c4d | 2302 | static void io_req_task_work_add_fallback(struct io_kiocb *req, |
7cbf1722 | 2303 | task_work_func_t cb) |
eab30c4d PB |
2304 | { |
2305 | struct task_struct *tsk = io_wq_get_task(req->ctx->io_wq); | |
2306 | ||
2307 | init_task_work(&req->task_work, cb); | |
2308 | task_work_add(tsk, &req->task_work, TWA_NONE); | |
2309 | wake_up_process(tsk); | |
2310 | } | |
2311 | ||
c40f6379 JA |
2312 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2313 | { | |
2314 | struct io_ring_ctx *ctx = req->ctx; | |
2315 | ||
2316 | spin_lock_irq(&ctx->completion_lock); | |
2317 | io_cqring_fill_event(req, error); | |
2318 | io_commit_cqring(ctx); | |
2319 | spin_unlock_irq(&ctx->completion_lock); | |
2320 | ||
2321 | io_cqring_ev_posted(ctx); | |
2322 | req_set_fail_links(req); | |
2323 | io_double_put_req(req); | |
2324 | } | |
2325 | ||
2326 | static void io_req_task_cancel(struct callback_head *cb) | |
2327 | { | |
2328 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2329 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2330 | |
2331 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2332 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2333 | } |
2334 | ||
2335 | static void __io_req_task_submit(struct io_kiocb *req) | |
2336 | { | |
2337 | struct io_ring_ctx *ctx = req->ctx; | |
2338 | ||
81b6d05c | 2339 | mutex_lock(&ctx->uring_lock); |
d9d05217 PB |
2340 | if (!ctx->sqo_dead && |
2341 | !__io_sq_thread_acquire_mm(ctx) && | |
2342 | !__io_sq_thread_acquire_files(ctx)) | |
c5eef2b9 | 2343 | __io_queue_sqe(req); |
81b6d05c | 2344 | else |
c40f6379 | 2345 | __io_req_task_cancel(req, -EFAULT); |
81b6d05c | 2346 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2347 | } |
2348 | ||
2349 | static void io_req_task_submit(struct callback_head *cb) | |
2350 | { | |
2351 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2352 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2353 | |
2354 | __io_req_task_submit(req); | |
6d816e08 | 2355 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2356 | } |
2357 | ||
2358 | static void io_req_task_queue(struct io_kiocb *req) | |
2359 | { | |
c40f6379 JA |
2360 | int ret; |
2361 | ||
7cbf1722 | 2362 | req->task_work.func = io_req_task_submit; |
6d816e08 | 2363 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2364 | |
355fb9e2 | 2365 | ret = io_req_task_work_add(req); |
eab30c4d PB |
2366 | if (unlikely(ret)) |
2367 | io_req_task_work_add_fallback(req, io_req_task_cancel); | |
c40f6379 JA |
2368 | } |
2369 | ||
f2f87370 | 2370 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2371 | { |
9b5f7bd9 | 2372 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2373 | |
2374 | if (nxt) | |
906a8c3f | 2375 | io_req_task_queue(nxt); |
c69f8dbe JL |
2376 | } |
2377 | ||
c3524383 | 2378 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2379 | { |
c3524383 PB |
2380 | io_queue_next(req); |
2381 | __io_free_req(req); | |
2382 | } | |
8766dd51 | 2383 | |
2d6500d4 | 2384 | struct req_batch { |
5af1d13e PB |
2385 | struct task_struct *task; |
2386 | int task_refs; | |
1b4c351f | 2387 | int ctx_refs; |
2d6500d4 PB |
2388 | }; |
2389 | ||
5af1d13e PB |
2390 | static inline void io_init_req_batch(struct req_batch *rb) |
2391 | { | |
5af1d13e | 2392 | rb->task_refs = 0; |
9ae72463 | 2393 | rb->ctx_refs = 0; |
5af1d13e PB |
2394 | rb->task = NULL; |
2395 | } | |
2396 | ||
2d6500d4 PB |
2397 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2398 | struct req_batch *rb) | |
2399 | { | |
6e833d53 | 2400 | if (rb->task) |
7c660731 | 2401 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2402 | if (rb->ctx_refs) |
2403 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2404 | } |
2405 | ||
6ff119a6 PB |
2406 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2407 | struct io_submit_state *state) | |
2d6500d4 | 2408 | { |
f2f87370 | 2409 | io_queue_next(req); |
2d6500d4 | 2410 | |
e3bc8e9d | 2411 | if (req->task != rb->task) { |
7c660731 PB |
2412 | if (rb->task) |
2413 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2414 | rb->task = req->task; |
2415 | rb->task_refs = 0; | |
5af1d13e | 2416 | } |
e3bc8e9d | 2417 | rb->task_refs++; |
9ae72463 | 2418 | rb->ctx_refs++; |
5af1d13e | 2419 | |
4edf20f9 | 2420 | io_dismantle_req(req); |
6ff119a6 PB |
2421 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) { |
2422 | state->reqs[state->free_reqs++] = req; | |
2423 | } else { | |
1b4c351f JA |
2424 | struct io_comp_state *cs = &req->ctx->submit_state.comp; |
2425 | ||
2426 | list_add(&req->compl.list, &cs->free_list); | |
6ff119a6 | 2427 | } |
7a743e22 PB |
2428 | } |
2429 | ||
905c172f PB |
2430 | static void io_submit_flush_completions(struct io_comp_state *cs, |
2431 | struct io_ring_ctx *ctx) | |
2432 | { | |
2433 | int i, nr = cs->nr; | |
2434 | struct io_kiocb *req; | |
2435 | struct req_batch rb; | |
2436 | ||
2437 | io_init_req_batch(&rb); | |
2438 | spin_lock_irq(&ctx->completion_lock); | |
2439 | for (i = 0; i < nr; i++) { | |
2440 | req = cs->reqs[i]; | |
2441 | __io_cqring_fill_event(req, req->result, req->compl.cflags); | |
2442 | } | |
2443 | io_commit_cqring(ctx); | |
2444 | spin_unlock_irq(&ctx->completion_lock); | |
2445 | ||
2446 | io_cqring_ev_posted(ctx); | |
2447 | for (i = 0; i < nr; i++) { | |
2448 | req = cs->reqs[i]; | |
2449 | ||
2450 | /* submission and completion refs */ | |
2451 | if (refcount_sub_and_test(2, &req->refs)) | |
6ff119a6 | 2452 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2453 | } |
2454 | ||
2455 | io_req_free_batch_finish(ctx, &rb); | |
2456 | cs->nr = 0; | |
2457 | } | |
2458 | ||
ba816ad6 JA |
2459 | /* |
2460 | * Drop reference to request, return next in chain (if there is one) if this | |
2461 | * was the last reference to this request. | |
2462 | */ | |
9b5f7bd9 | 2463 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2464 | { |
9b5f7bd9 PB |
2465 | struct io_kiocb *nxt = NULL; |
2466 | ||
2a44f467 | 2467 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2468 | nxt = io_req_find_next(req); |
4d7dd462 | 2469 | __io_free_req(req); |
2a44f467 | 2470 | } |
9b5f7bd9 | 2471 | return nxt; |
2b188cc1 JA |
2472 | } |
2473 | ||
e65ef56d JA |
2474 | static void io_put_req(struct io_kiocb *req) |
2475 | { | |
2476 | if (refcount_dec_and_test(&req->refs)) | |
2477 | io_free_req(req); | |
2b188cc1 JA |
2478 | } |
2479 | ||
216578e5 PB |
2480 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2481 | { | |
2482 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2483 | ||
2484 | io_free_req(req); | |
2485 | } | |
2486 | ||
2487 | static void io_free_req_deferred(struct io_kiocb *req) | |
2488 | { | |
2489 | int ret; | |
2490 | ||
7cbf1722 | 2491 | req->task_work.func = io_put_req_deferred_cb; |
355fb9e2 | 2492 | ret = io_req_task_work_add(req); |
eab30c4d PB |
2493 | if (unlikely(ret)) |
2494 | io_req_task_work_add_fallback(req, io_put_req_deferred_cb); | |
216578e5 PB |
2495 | } |
2496 | ||
2497 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2498 | { | |
2499 | if (refcount_sub_and_test(refs, &req->refs)) | |
2500 | io_free_req_deferred(req); | |
2501 | } | |
2502 | ||
978db57e JA |
2503 | static void io_double_put_req(struct io_kiocb *req) |
2504 | { | |
2505 | /* drop both submit and complete references */ | |
2506 | if (refcount_sub_and_test(2, &req->refs)) | |
2507 | io_free_req(req); | |
2508 | } | |
2509 | ||
6c503150 | 2510 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2511 | { |
2512 | /* See comment at the top of this file */ | |
2513 | smp_rmb(); | |
e23de15f | 2514 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2515 | } |
2516 | ||
fb5ccc98 PB |
2517 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2518 | { | |
2519 | struct io_rings *rings = ctx->rings; | |
2520 | ||
2521 | /* make sure SQ entry isn't read before tail */ | |
2522 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2523 | } | |
2524 | ||
8ff069bf | 2525 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2526 | { |
8ff069bf | 2527 | unsigned int cflags; |
e94f141b | 2528 | |
bcda7baa JA |
2529 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2530 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2531 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2532 | kfree(kbuf); |
2533 | return cflags; | |
e94f141b JA |
2534 | } |
2535 | ||
8ff069bf | 2536 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2537 | { |
4d954c25 | 2538 | struct io_buffer *kbuf; |
bcda7baa | 2539 | |
4d954c25 | 2540 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2541 | return io_put_kbuf(req, kbuf); |
2542 | } | |
2543 | ||
4c6e277c JA |
2544 | static inline bool io_run_task_work(void) |
2545 | { | |
6200b0ae JA |
2546 | /* |
2547 | * Not safe to run on exiting task, and the task_work handling will | |
2548 | * not add work to such a task. | |
2549 | */ | |
2550 | if (unlikely(current->flags & PF_EXITING)) | |
2551 | return false; | |
4c6e277c JA |
2552 | if (current->task_works) { |
2553 | __set_current_state(TASK_RUNNING); | |
2554 | task_work_run(); | |
2555 | return true; | |
2556 | } | |
2557 | ||
2558 | return false; | |
bcda7baa JA |
2559 | } |
2560 | ||
bbde017a XW |
2561 | static void io_iopoll_queue(struct list_head *again) |
2562 | { | |
2563 | struct io_kiocb *req; | |
2564 | ||
2565 | do { | |
d21ffe7e PB |
2566 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2567 | list_del(&req->inflight_entry); | |
889fca73 | 2568 | __io_complete_rw(req, -EAGAIN, 0, 0); |
bbde017a XW |
2569 | } while (!list_empty(again)); |
2570 | } | |
2571 | ||
def596e9 JA |
2572 | /* |
2573 | * Find and free completed poll iocbs | |
2574 | */ | |
2575 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2576 | struct list_head *done) | |
2577 | { | |
8237e045 | 2578 | struct req_batch rb; |
def596e9 | 2579 | struct io_kiocb *req; |
bbde017a XW |
2580 | LIST_HEAD(again); |
2581 | ||
2582 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2583 | smp_rmb(); | |
def596e9 | 2584 | |
5af1d13e | 2585 | io_init_req_batch(&rb); |
def596e9 | 2586 | while (!list_empty(done)) { |
bcda7baa JA |
2587 | int cflags = 0; |
2588 | ||
d21ffe7e | 2589 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2590 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2591 | req->result = 0; |
bbde017a | 2592 | req->iopoll_completed = 0; |
d21ffe7e | 2593 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2594 | continue; |
2595 | } | |
d21ffe7e | 2596 | list_del(&req->inflight_entry); |
def596e9 | 2597 | |
bcda7baa | 2598 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2599 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2600 | |
2601 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2602 | (*nr_events)++; |
2603 | ||
c3524383 | 2604 | if (refcount_dec_and_test(&req->refs)) |
6ff119a6 | 2605 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2606 | } |
def596e9 | 2607 | |
09bb8394 | 2608 | io_commit_cqring(ctx); |
80c18e4a | 2609 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2610 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2611 | |
bbde017a XW |
2612 | if (!list_empty(&again)) |
2613 | io_iopoll_queue(&again); | |
581f9810 BM |
2614 | } |
2615 | ||
def596e9 JA |
2616 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2617 | long min) | |
2618 | { | |
2619 | struct io_kiocb *req, *tmp; | |
2620 | LIST_HEAD(done); | |
2621 | bool spin; | |
2622 | int ret; | |
2623 | ||
2624 | /* | |
2625 | * Only spin for completions if we don't have multiple devices hanging | |
2626 | * off our complete list, and we're under the requested amount. | |
2627 | */ | |
2628 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2629 | ||
2630 | ret = 0; | |
d21ffe7e | 2631 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2632 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2633 | |
2634 | /* | |
581f9810 BM |
2635 | * Move completed and retryable entries to our local lists. |
2636 | * If we find a request that requires polling, break out | |
2637 | * and complete those lists first, if we have entries there. | |
def596e9 | 2638 | */ |
65a6543d | 2639 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2640 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2641 | continue; |
2642 | } | |
2643 | if (!list_empty(&done)) | |
2644 | break; | |
2645 | ||
2646 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2647 | if (ret < 0) | |
2648 | break; | |
2649 | ||
3aadc23e PB |
2650 | /* iopoll may have completed current req */ |
2651 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2652 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2653 | |
def596e9 JA |
2654 | if (ret && spin) |
2655 | spin = false; | |
2656 | ret = 0; | |
2657 | } | |
2658 | ||
2659 | if (!list_empty(&done)) | |
2660 | io_iopoll_complete(ctx, nr_events, &done); | |
2661 | ||
2662 | return ret; | |
2663 | } | |
2664 | ||
2665 | /* | |
d195a66e | 2666 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2667 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2668 | * as a non-spinning completion check. | |
2669 | */ | |
2670 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2671 | long min) | |
2672 | { | |
540e32a0 | 2673 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2674 | int ret; |
2675 | ||
2676 | ret = io_do_iopoll(ctx, nr_events, min); | |
2677 | if (ret < 0) | |
2678 | return ret; | |
eba0a4dd | 2679 | if (*nr_events >= min) |
def596e9 JA |
2680 | return 0; |
2681 | } | |
2682 | ||
2683 | return 1; | |
2684 | } | |
2685 | ||
2686 | /* | |
2687 | * We can't just wait for polled events to come to us, we have to actively | |
2688 | * find and complete them. | |
2689 | */ | |
b2edc0a7 | 2690 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2691 | { |
2692 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2693 | return; | |
2694 | ||
2695 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2696 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2697 | unsigned int nr_events = 0; |
2698 | ||
b2edc0a7 | 2699 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2700 | |
b2edc0a7 PB |
2701 | /* let it sleep and repeat later if can't complete a request */ |
2702 | if (nr_events == 0) | |
2703 | break; | |
08f5439f JA |
2704 | /* |
2705 | * Ensure we allow local-to-the-cpu processing to take place, | |
2706 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2707 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2708 | */ |
3fcee5a6 PB |
2709 | if (need_resched()) { |
2710 | mutex_unlock(&ctx->uring_lock); | |
2711 | cond_resched(); | |
2712 | mutex_lock(&ctx->uring_lock); | |
2713 | } | |
def596e9 JA |
2714 | } |
2715 | mutex_unlock(&ctx->uring_lock); | |
2716 | } | |
2717 | ||
7668b92a | 2718 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2719 | { |
7668b92a | 2720 | unsigned int nr_events = 0; |
2b2ed975 | 2721 | int iters = 0, ret = 0; |
500f9fba | 2722 | |
c7849be9 XW |
2723 | /* |
2724 | * We disallow the app entering submit/complete with polling, but we | |
2725 | * still need to lock the ring to prevent racing with polled issue | |
2726 | * that got punted to a workqueue. | |
2727 | */ | |
2728 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2729 | do { |
a3a0e43f JA |
2730 | /* |
2731 | * Don't enter poll loop if we already have events pending. | |
2732 | * If we do, we can potentially be spinning for commands that | |
2733 | * already triggered a CQE (eg in error). | |
2734 | */ | |
6c503150 PB |
2735 | if (test_bit(0, &ctx->cq_check_overflow)) |
2736 | __io_cqring_overflow_flush(ctx, false, NULL, NULL); | |
2737 | if (io_cqring_events(ctx)) | |
a3a0e43f JA |
2738 | break; |
2739 | ||
500f9fba JA |
2740 | /* |
2741 | * If a submit got punted to a workqueue, we can have the | |
2742 | * application entering polling for a command before it gets | |
2743 | * issued. That app will hold the uring_lock for the duration | |
2744 | * of the poll right here, so we need to take a breather every | |
2745 | * now and then to ensure that the issue has a chance to add | |
2746 | * the poll to the issued list. Otherwise we can spin here | |
2747 | * forever, while the workqueue is stuck trying to acquire the | |
2748 | * very same mutex. | |
2749 | */ | |
2750 | if (!(++iters & 7)) { | |
2751 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2752 | io_run_task_work(); |
500f9fba JA |
2753 | mutex_lock(&ctx->uring_lock); |
2754 | } | |
2755 | ||
7668b92a | 2756 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2757 | if (ret <= 0) |
2758 | break; | |
2759 | ret = 0; | |
7668b92a | 2760 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2761 | |
500f9fba | 2762 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2763 | return ret; |
2764 | } | |
2765 | ||
491381ce | 2766 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2767 | { |
491381ce JA |
2768 | /* |
2769 | * Tell lockdep we inherited freeze protection from submission | |
2770 | * thread. | |
2771 | */ | |
2772 | if (req->flags & REQ_F_ISREG) { | |
2773 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2774 | |
491381ce | 2775 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2776 | } |
491381ce | 2777 | file_end_write(req->file); |
2b188cc1 JA |
2778 | } |
2779 | ||
a1d7c393 | 2780 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
889fca73 | 2781 | unsigned int issue_flags) |
2b188cc1 | 2782 | { |
9adbd45d | 2783 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2784 | int cflags = 0; |
2b188cc1 | 2785 | |
491381ce JA |
2786 | if (kiocb->ki_flags & IOCB_WRITE) |
2787 | kiocb_end_write(req); | |
2b188cc1 | 2788 | |
4e88d6e7 JA |
2789 | if (res != req->result) |
2790 | req_set_fail_links(req); | |
bcda7baa | 2791 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2792 | cflags = io_put_rw_kbuf(req); |
889fca73 | 2793 | __io_req_complete(req, issue_flags, res, cflags); |
ba816ad6 JA |
2794 | } |
2795 | ||
b63534c4 | 2796 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2797 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 JA |
2798 | { |
2799 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
4a245479 | 2800 | int rw, ret; |
b63534c4 | 2801 | struct iov_iter iter; |
b63534c4 | 2802 | |
dc2a6e9a PB |
2803 | /* already prepared */ |
2804 | if (req->async_data) | |
2805 | return true; | |
b63534c4 JA |
2806 | |
2807 | switch (req->opcode) { | |
2808 | case IORING_OP_READV: | |
2809 | case IORING_OP_READ_FIXED: | |
2810 | case IORING_OP_READ: | |
2811 | rw = READ; | |
2812 | break; | |
2813 | case IORING_OP_WRITEV: | |
2814 | case IORING_OP_WRITE_FIXED: | |
2815 | case IORING_OP_WRITE: | |
2816 | rw = WRITE; | |
2817 | break; | |
2818 | default: | |
2819 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2820 | req->opcode); | |
dc2a6e9a | 2821 | return false; |
b63534c4 JA |
2822 | } |
2823 | ||
dc2a6e9a PB |
2824 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2825 | if (ret < 0) | |
2826 | return false; | |
6bf985dc | 2827 | return !io_setup_async_rw(req, iovec, inline_vecs, &iter, false); |
b63534c4 | 2828 | } |
b63534c4 JA |
2829 | #endif |
2830 | ||
2831 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2832 | { | |
2833 | #ifdef CONFIG_BLOCK | |
bf6182b6 | 2834 | umode_t mode; |
b63534c4 JA |
2835 | int ret; |
2836 | ||
bf6182b6 | 2837 | if (res != -EAGAIN && res != -EOPNOTSUPP) |
355afaeb | 2838 | return false; |
bf6182b6 | 2839 | mode = file_inode(req->file)->i_mode; |
75c668cd PB |
2840 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2841 | return false; | |
2842 | if ((req->flags & REQ_F_NOWAIT) || io_wq_current_is_worker()) | |
b63534c4 JA |
2843 | return false; |
2844 | ||
55e6ac1e PB |
2845 | lockdep_assert_held(&req->ctx->uring_lock); |
2846 | ||
28cea78a | 2847 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2848 | |
dc2a6e9a | 2849 | if (!ret && io_resubmit_prep(req)) { |
fdee946d JA |
2850 | refcount_inc(&req->refs); |
2851 | io_queue_async_work(req); | |
b63534c4 | 2852 | return true; |
fdee946d | 2853 | } |
dc2a6e9a | 2854 | req_set_fail_links(req); |
b63534c4 JA |
2855 | #endif |
2856 | return false; | |
2857 | } | |
2858 | ||
a1d7c393 | 2859 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2860 | unsigned int issue_flags) |
a1d7c393 JA |
2861 | { |
2862 | if (!io_rw_reissue(req, res)) | |
889fca73 | 2863 | io_complete_rw_common(&req->rw.kiocb, res, issue_flags); |
ba816ad6 JA |
2864 | } |
2865 | ||
2866 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2867 | { | |
9adbd45d | 2868 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2869 | |
889fca73 | 2870 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2871 | } |
2872 | ||
def596e9 JA |
2873 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2874 | { | |
9adbd45d | 2875 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2876 | |
491381ce JA |
2877 | if (kiocb->ki_flags & IOCB_WRITE) |
2878 | kiocb_end_write(req); | |
def596e9 | 2879 | |
2d7d6792 | 2880 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2881 | req_set_fail_links(req); |
bbde017a XW |
2882 | |
2883 | WRITE_ONCE(req->result, res); | |
2884 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2885 | smp_wmb(); |
2886 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2887 | } |
2888 | ||
2889 | /* | |
2890 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2891 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2892 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2893 | * accessing the kiocb cookie. | |
2894 | */ | |
2e9dbe90 | 2895 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2896 | { |
2897 | struct io_ring_ctx *ctx = req->ctx; | |
2898 | ||
2899 | /* | |
2900 | * Track whether we have multiple files in our lists. This will impact | |
2901 | * how we do polling eventually, not spinning if we're on potentially | |
2902 | * different devices. | |
2903 | */ | |
540e32a0 | 2904 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2905 | ctx->poll_multi_file = false; |
2906 | } else if (!ctx->poll_multi_file) { | |
2907 | struct io_kiocb *list_req; | |
2908 | ||
540e32a0 | 2909 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2910 | inflight_entry); |
9adbd45d | 2911 | if (list_req->file != req->file) |
def596e9 JA |
2912 | ctx->poll_multi_file = true; |
2913 | } | |
2914 | ||
2915 | /* | |
2916 | * For fast devices, IO may have already completed. If it has, add | |
2917 | * it to the front so we find it first. | |
2918 | */ | |
65a6543d | 2919 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2920 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2921 | else |
d21ffe7e | 2922 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2923 | |
2e9dbe90 XW |
2924 | /* |
2925 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2926 | * task context or in io worker task context. If current task context is | |
2927 | * sq thread, we don't need to check whether should wake up sq thread. | |
2928 | */ | |
2929 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2930 | wq_has_sleeper(&ctx->sq_data->wait)) |
2931 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2932 | } |
2933 | ||
9f13c35b PB |
2934 | static inline void io_state_file_put(struct io_submit_state *state) |
2935 | { | |
02b23a9a PB |
2936 | if (state->file_refs) { |
2937 | fput_many(state->file, state->file_refs); | |
2938 | state->file_refs = 0; | |
2939 | } | |
9a56a232 JA |
2940 | } |
2941 | ||
2942 | /* | |
2943 | * Get as many references to a file as we have IOs left in this submission, | |
2944 | * assuming most submissions are for one file, or at least that each file | |
2945 | * has more than one submission. | |
2946 | */ | |
8da11c19 | 2947 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2948 | { |
2949 | if (!state) | |
2950 | return fget(fd); | |
2951 | ||
6e1271e6 | 2952 | if (state->file_refs) { |
9a56a232 | 2953 | if (state->fd == fd) { |
6e1271e6 | 2954 | state->file_refs--; |
9a56a232 JA |
2955 | return state->file; |
2956 | } | |
02b23a9a | 2957 | io_state_file_put(state); |
9a56a232 JA |
2958 | } |
2959 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2960 | if (unlikely(!state->file)) |
9a56a232 JA |
2961 | return NULL; |
2962 | ||
2963 | state->fd = fd; | |
6e1271e6 | 2964 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2965 | return state->file; |
2966 | } | |
2967 | ||
4503b767 JA |
2968 | static bool io_bdev_nowait(struct block_device *bdev) |
2969 | { | |
9ba0d0c8 | 2970 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2971 | } |
2972 | ||
2b188cc1 JA |
2973 | /* |
2974 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2975 | * any file. For now, just ensure that anything potentially problematic is done | |
2976 | * inline. | |
2977 | */ | |
af197f50 | 2978 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2979 | { |
2980 | umode_t mode = file_inode(file)->i_mode; | |
2981 | ||
4503b767 | 2982 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2983 | if (IS_ENABLED(CONFIG_BLOCK) && |
2984 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2985 | return true; |
2986 | return false; | |
2987 | } | |
2988 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2989 | return true; |
4503b767 | 2990 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2991 | if (IS_ENABLED(CONFIG_BLOCK) && |
2992 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2993 | file->f_op != &io_uring_fops) |
2994 | return true; | |
2995 | return false; | |
2996 | } | |
2b188cc1 | 2997 | |
c5b85625 JA |
2998 | /* any ->read/write should understand O_NONBLOCK */ |
2999 | if (file->f_flags & O_NONBLOCK) | |
3000 | return true; | |
3001 | ||
af197f50 JA |
3002 | if (!(file->f_mode & FMODE_NOWAIT)) |
3003 | return false; | |
3004 | ||
3005 | if (rw == READ) | |
3006 | return file->f_op->read_iter != NULL; | |
3007 | ||
3008 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
3009 | } |
3010 | ||
a88fc400 | 3011 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 3012 | { |
def596e9 | 3013 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 3014 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 3015 | struct file *file = req->file; |
09bb8394 JA |
3016 | unsigned ioprio; |
3017 | int ret; | |
2b188cc1 | 3018 | |
75c668cd | 3019 | if (S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
3020 | req->flags |= REQ_F_ISREG; |
3021 | ||
2b188cc1 | 3022 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 3023 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 3024 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 3025 | kiocb->ki_pos = file->f_pos; |
ba04291e | 3026 | } |
2b188cc1 | 3027 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
3028 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
3029 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
3030 | if (unlikely(ret)) | |
3031 | return ret; | |
2b188cc1 | 3032 | |
75c668cd PB |
3033 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
3034 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
3035 | req->flags |= REQ_F_NOWAIT; | |
3036 | ||
2b188cc1 JA |
3037 | ioprio = READ_ONCE(sqe->ioprio); |
3038 | if (ioprio) { | |
3039 | ret = ioprio_check_cap(ioprio); | |
3040 | if (ret) | |
09bb8394 | 3041 | return ret; |
2b188cc1 JA |
3042 | |
3043 | kiocb->ki_ioprio = ioprio; | |
3044 | } else | |
3045 | kiocb->ki_ioprio = get_current_ioprio(); | |
3046 | ||
def596e9 | 3047 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
3048 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
3049 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 3050 | return -EOPNOTSUPP; |
2b188cc1 | 3051 | |
def596e9 JA |
3052 | kiocb->ki_flags |= IOCB_HIPRI; |
3053 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 3054 | req->iopoll_completed = 0; |
def596e9 | 3055 | } else { |
09bb8394 JA |
3056 | if (kiocb->ki_flags & IOCB_HIPRI) |
3057 | return -EINVAL; | |
def596e9 JA |
3058 | kiocb->ki_complete = io_complete_rw; |
3059 | } | |
9adbd45d | 3060 | |
3529d8c2 JA |
3061 | req->rw.addr = READ_ONCE(sqe->addr); |
3062 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 3063 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3064 | return 0; |
2b188cc1 JA |
3065 | } |
3066 | ||
3067 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3068 | { | |
3069 | switch (ret) { | |
3070 | case -EIOCBQUEUED: | |
3071 | break; | |
3072 | case -ERESTARTSYS: | |
3073 | case -ERESTARTNOINTR: | |
3074 | case -ERESTARTNOHAND: | |
3075 | case -ERESTART_RESTARTBLOCK: | |
3076 | /* | |
3077 | * We can't just restart the syscall, since previously | |
3078 | * submitted sqes may already be in progress. Just fail this | |
3079 | * IO with EINTR. | |
3080 | */ | |
3081 | ret = -EINTR; | |
df561f66 | 3082 | fallthrough; |
2b188cc1 JA |
3083 | default: |
3084 | kiocb->ki_complete(kiocb, ret, 0); | |
3085 | } | |
3086 | } | |
3087 | ||
a1d7c393 | 3088 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 3089 | unsigned int issue_flags) |
ba816ad6 | 3090 | { |
ba04291e | 3091 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 3092 | struct io_async_rw *io = req->async_data; |
ba04291e | 3093 | |
227c0c96 | 3094 | /* add previously done IO, if any */ |
e8c2bc1f | 3095 | if (io && io->bytes_done > 0) { |
227c0c96 | 3096 | if (ret < 0) |
e8c2bc1f | 3097 | ret = io->bytes_done; |
227c0c96 | 3098 | else |
e8c2bc1f | 3099 | ret += io->bytes_done; |
227c0c96 JA |
3100 | } |
3101 | ||
ba04291e JA |
3102 | if (req->flags & REQ_F_CUR_POS) |
3103 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 3104 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
889fca73 | 3105 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
3106 | else |
3107 | io_rw_done(kiocb, ret); | |
3108 | } | |
3109 | ||
847595de | 3110 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
edafccee | 3111 | { |
9adbd45d JA |
3112 | struct io_ring_ctx *ctx = req->ctx; |
3113 | size_t len = req->rw.len; | |
edafccee | 3114 | struct io_mapped_ubuf *imu; |
4be1c615 | 3115 | u16 index, buf_index = req->buf_index; |
edafccee JA |
3116 | size_t offset; |
3117 | u64 buf_addr; | |
3118 | ||
edafccee JA |
3119 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3120 | return -EFAULT; | |
edafccee JA |
3121 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3122 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 3123 | buf_addr = req->rw.addr; |
edafccee JA |
3124 | |
3125 | /* overflow */ | |
3126 | if (buf_addr + len < buf_addr) | |
3127 | return -EFAULT; | |
3128 | /* not inside the mapped region */ | |
3129 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
3130 | return -EFAULT; | |
3131 | ||
3132 | /* | |
3133 | * May not be a start of buffer, set size appropriately | |
3134 | * and advance us to the beginning. | |
3135 | */ | |
3136 | offset = buf_addr - imu->ubuf; | |
3137 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3138 | |
3139 | if (offset) { | |
3140 | /* | |
3141 | * Don't use iov_iter_advance() here, as it's really slow for | |
3142 | * using the latter parts of a big fixed buffer - it iterates | |
3143 | * over each segment manually. We can cheat a bit here, because | |
3144 | * we know that: | |
3145 | * | |
3146 | * 1) it's a BVEC iter, we set it up | |
3147 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3148 | * first and last bvec | |
3149 | * | |
3150 | * So just find our index, and adjust the iterator afterwards. | |
3151 | * If the offset is within the first bvec (or the whole first | |
3152 | * bvec, just use iov_iter_advance(). This makes it easier | |
3153 | * since we can just skip the first segment, which may not | |
3154 | * be PAGE_SIZE aligned. | |
3155 | */ | |
3156 | const struct bio_vec *bvec = imu->bvec; | |
3157 | ||
3158 | if (offset <= bvec->bv_len) { | |
3159 | iov_iter_advance(iter, offset); | |
3160 | } else { | |
3161 | unsigned long seg_skip; | |
3162 | ||
3163 | /* skip first vec */ | |
3164 | offset -= bvec->bv_len; | |
3165 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3166 | ||
3167 | iter->bvec = bvec + seg_skip; | |
3168 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3169 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3170 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3171 | } |
3172 | } | |
3173 | ||
847595de | 3174 | return 0; |
edafccee JA |
3175 | } |
3176 | ||
bcda7baa JA |
3177 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3178 | { | |
3179 | if (needs_lock) | |
3180 | mutex_unlock(&ctx->uring_lock); | |
3181 | } | |
3182 | ||
3183 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3184 | { | |
3185 | /* | |
3186 | * "Normal" inline submissions always hold the uring_lock, since we | |
3187 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3188 | * The only exception is when we've detached the request and issue it | |
3189 | * from an async worker thread, grab the lock for that case. | |
3190 | */ | |
3191 | if (needs_lock) | |
3192 | mutex_lock(&ctx->uring_lock); | |
3193 | } | |
3194 | ||
3195 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3196 | int bgid, struct io_buffer *kbuf, | |
3197 | bool needs_lock) | |
3198 | { | |
3199 | struct io_buffer *head; | |
3200 | ||
3201 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3202 | return kbuf; | |
3203 | ||
3204 | io_ring_submit_lock(req->ctx, needs_lock); | |
3205 | ||
3206 | lockdep_assert_held(&req->ctx->uring_lock); | |
3207 | ||
3208 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3209 | if (head) { | |
3210 | if (!list_empty(&head->list)) { | |
3211 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3212 | list); | |
3213 | list_del(&kbuf->list); | |
3214 | } else { | |
3215 | kbuf = head; | |
3216 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3217 | } | |
3218 | if (*len > kbuf->len) | |
3219 | *len = kbuf->len; | |
3220 | } else { | |
3221 | kbuf = ERR_PTR(-ENOBUFS); | |
3222 | } | |
3223 | ||
3224 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3225 | ||
3226 | return kbuf; | |
3227 | } | |
3228 | ||
4d954c25 JA |
3229 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3230 | bool needs_lock) | |
3231 | { | |
3232 | struct io_buffer *kbuf; | |
4f4eeba8 | 3233 | u16 bgid; |
4d954c25 JA |
3234 | |
3235 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3236 | bgid = req->buf_index; |
4d954c25 JA |
3237 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3238 | if (IS_ERR(kbuf)) | |
3239 | return kbuf; | |
3240 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3241 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3242 | return u64_to_user_ptr(kbuf->addr); | |
3243 | } | |
3244 | ||
3245 | #ifdef CONFIG_COMPAT | |
3246 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3247 | bool needs_lock) | |
3248 | { | |
3249 | struct compat_iovec __user *uiov; | |
3250 | compat_ssize_t clen; | |
3251 | void __user *buf; | |
3252 | ssize_t len; | |
3253 | ||
3254 | uiov = u64_to_user_ptr(req->rw.addr); | |
3255 | if (!access_ok(uiov, sizeof(*uiov))) | |
3256 | return -EFAULT; | |
3257 | if (__get_user(clen, &uiov->iov_len)) | |
3258 | return -EFAULT; | |
3259 | if (clen < 0) | |
3260 | return -EINVAL; | |
3261 | ||
3262 | len = clen; | |
3263 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3264 | if (IS_ERR(buf)) | |
3265 | return PTR_ERR(buf); | |
3266 | iov[0].iov_base = buf; | |
3267 | iov[0].iov_len = (compat_size_t) len; | |
3268 | return 0; | |
3269 | } | |
3270 | #endif | |
3271 | ||
3272 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3273 | bool needs_lock) | |
3274 | { | |
3275 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3276 | void __user *buf; | |
3277 | ssize_t len; | |
3278 | ||
3279 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3280 | return -EFAULT; | |
3281 | ||
3282 | len = iov[0].iov_len; | |
3283 | if (len < 0) | |
3284 | return -EINVAL; | |
3285 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3286 | if (IS_ERR(buf)) | |
3287 | return PTR_ERR(buf); | |
3288 | iov[0].iov_base = buf; | |
3289 | iov[0].iov_len = len; | |
3290 | return 0; | |
3291 | } | |
3292 | ||
3293 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3294 | bool needs_lock) | |
3295 | { | |
dddb3e26 JA |
3296 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3297 | struct io_buffer *kbuf; | |
3298 | ||
3299 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3300 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3301 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3302 | return 0; |
dddb3e26 | 3303 | } |
dd201662 | 3304 | if (req->rw.len != 1) |
4d954c25 JA |
3305 | return -EINVAL; |
3306 | ||
3307 | #ifdef CONFIG_COMPAT | |
3308 | if (req->ctx->compat) | |
3309 | return io_compat_import(req, iov, needs_lock); | |
3310 | #endif | |
3311 | ||
3312 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3313 | } | |
3314 | ||
847595de PB |
3315 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3316 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3317 | { |
9adbd45d JA |
3318 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3319 | size_t sqe_len = req->rw.len; | |
847595de | 3320 | u8 opcode = req->opcode; |
4d954c25 | 3321 | ssize_t ret; |
edafccee | 3322 | |
7d009165 | 3323 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3324 | *iovec = NULL; |
9adbd45d | 3325 | return io_import_fixed(req, rw, iter); |
edafccee | 3326 | } |
2b188cc1 | 3327 | |
bcda7baa | 3328 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3329 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3330 | return -EINVAL; |
3331 | ||
3a6820f2 | 3332 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3333 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3334 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3335 | if (IS_ERR(buf)) |
4d954c25 | 3336 | return PTR_ERR(buf); |
3f9d6441 | 3337 | req->rw.len = sqe_len; |
bcda7baa JA |
3338 | } |
3339 | ||
3a6820f2 JA |
3340 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3341 | *iovec = NULL; | |
10fc72e4 | 3342 | return ret; |
3a6820f2 JA |
3343 | } |
3344 | ||
4d954c25 JA |
3345 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3346 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3347 | if (!ret) |
3348 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3349 | *iovec = NULL; |
3350 | return ret; | |
3351 | } | |
3352 | ||
89cd35c5 CH |
3353 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3354 | req->ctx->compat); | |
2b188cc1 JA |
3355 | } |
3356 | ||
0fef9483 JA |
3357 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3358 | { | |
5b09e37e | 3359 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3360 | } |
3361 | ||
31b51510 | 3362 | /* |
32960613 JA |
3363 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3364 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3365 | */ |
4017eb91 | 3366 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3367 | { |
4017eb91 JA |
3368 | struct kiocb *kiocb = &req->rw.kiocb; |
3369 | struct file *file = req->file; | |
32960613 JA |
3370 | ssize_t ret = 0; |
3371 | ||
3372 | /* | |
3373 | * Don't support polled IO through this interface, and we can't | |
3374 | * support non-blocking either. For the latter, this just causes | |
3375 | * the kiocb to be handled from an async context. | |
3376 | */ | |
3377 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3378 | return -EOPNOTSUPP; | |
3379 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3380 | return -EAGAIN; | |
3381 | ||
3382 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3383 | struct iovec iovec; |
32960613 JA |
3384 | ssize_t nr; |
3385 | ||
311ae9e1 PB |
3386 | if (!iov_iter_is_bvec(iter)) { |
3387 | iovec = iov_iter_iovec(iter); | |
3388 | } else { | |
4017eb91 JA |
3389 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3390 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3391 | } |
3392 | ||
32960613 JA |
3393 | if (rw == READ) { |
3394 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3395 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3396 | } else { |
3397 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3398 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3399 | } |
3400 | ||
3401 | if (nr < 0) { | |
3402 | if (!ret) | |
3403 | ret = nr; | |
3404 | break; | |
3405 | } | |
3406 | ret += nr; | |
3407 | if (nr != iovec.iov_len) | |
3408 | break; | |
4017eb91 JA |
3409 | req->rw.len -= nr; |
3410 | req->rw.addr += nr; | |
32960613 JA |
3411 | iov_iter_advance(iter, nr); |
3412 | } | |
3413 | ||
3414 | return ret; | |
3415 | } | |
3416 | ||
ff6165b2 JA |
3417 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3418 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3419 | { |
e8c2bc1f | 3420 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3421 | |
ff6165b2 | 3422 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3423 | rw->free_iovec = iovec; |
227c0c96 | 3424 | rw->bytes_done = 0; |
ff6165b2 | 3425 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3426 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3427 | return; |
b64e3444 | 3428 | if (!iovec) { |
ff6165b2 JA |
3429 | unsigned iov_off = 0; |
3430 | ||
3431 | rw->iter.iov = rw->fast_iov; | |
3432 | if (iter->iov != fast_iov) { | |
3433 | iov_off = iter->iov - fast_iov; | |
3434 | rw->iter.iov += iov_off; | |
3435 | } | |
3436 | if (rw->fast_iov != fast_iov) | |
3437 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3438 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3439 | } else { |
3440 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3441 | } |
3442 | } | |
3443 | ||
e8c2bc1f | 3444 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3445 | { |
e8c2bc1f JA |
3446 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3447 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3448 | return req->async_data == NULL; | |
3d9932a8 XW |
3449 | } |
3450 | ||
e8c2bc1f | 3451 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3452 | { |
e8c2bc1f | 3453 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3454 | return 0; |
3d9932a8 | 3455 | |
e8c2bc1f | 3456 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3457 | } |
3458 | ||
ff6165b2 JA |
3459 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3460 | const struct iovec *fast_iov, | |
227c0c96 | 3461 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3462 | { |
e8c2bc1f | 3463 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3464 | return 0; |
e8c2bc1f | 3465 | if (!req->async_data) { |
6bf985dc PB |
3466 | if (__io_alloc_async_data(req)) { |
3467 | kfree(iovec); | |
5d204bcf | 3468 | return -ENOMEM; |
6bf985dc | 3469 | } |
b7bb4f7d | 3470 | |
ff6165b2 | 3471 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3472 | } |
b7bb4f7d | 3473 | return 0; |
f67676d1 JA |
3474 | } |
3475 | ||
73debe68 | 3476 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3477 | { |
e8c2bc1f | 3478 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3479 | struct iovec *iov = iorw->fast_iov; |
847595de | 3480 | int ret; |
c3e330a4 | 3481 | |
2846c481 | 3482 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3483 | if (unlikely(ret < 0)) |
3484 | return ret; | |
3485 | ||
ab0b196c PB |
3486 | iorw->bytes_done = 0; |
3487 | iorw->free_iovec = iov; | |
3488 | if (iov) | |
3489 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3490 | return 0; |
3491 | } | |
3492 | ||
73debe68 | 3493 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3494 | { |
3495 | ssize_t ret; | |
3496 | ||
a88fc400 | 3497 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3498 | if (ret) |
3499 | return ret; | |
f67676d1 | 3500 | |
3529d8c2 JA |
3501 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3502 | return -EBADF; | |
f67676d1 | 3503 | |
5f798bea | 3504 | /* either don't need iovec imported or already have it */ |
2d199895 | 3505 | if (!req->async_data) |
3529d8c2 | 3506 | return 0; |
73debe68 | 3507 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3508 | } |
3509 | ||
c1dd91d1 JA |
3510 | /* |
3511 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3512 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3513 | * This gets called when the page is unlocked, and we generally expect that to | |
3514 | * happen when the page IO is completed and the page is now uptodate. This will | |
3515 | * queue a task_work based retry of the operation, attempting to copy the data | |
3516 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3517 | * do a thread based blocking retry of the operation. That's the unexpected | |
3518 | * slow path. | |
3519 | */ | |
bcf5a063 JA |
3520 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3521 | int sync, void *arg) | |
3522 | { | |
3523 | struct wait_page_queue *wpq; | |
3524 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3525 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3526 | int ret; |
3527 | ||
3528 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3529 | ||
cdc8fcb4 LT |
3530 | if (!wake_page_match(wpq, key)) |
3531 | return 0; | |
3532 | ||
c8d317aa | 3533 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3534 | list_del_init(&wait->entry); |
3535 | ||
7cbf1722 | 3536 | req->task_work.func = io_req_task_submit; |
6d816e08 JA |
3537 | percpu_ref_get(&req->ctx->refs); |
3538 | ||
bcf5a063 JA |
3539 | /* submit ref gets dropped, acquire a new one */ |
3540 | refcount_inc(&req->refs); | |
355fb9e2 | 3541 | ret = io_req_task_work_add(req); |
eab30c4d PB |
3542 | if (unlikely(ret)) |
3543 | io_req_task_work_add_fallback(req, io_req_task_cancel); | |
bcf5a063 JA |
3544 | return 1; |
3545 | } | |
3546 | ||
c1dd91d1 JA |
3547 | /* |
3548 | * This controls whether a given IO request should be armed for async page | |
3549 | * based retry. If we return false here, the request is handed to the async | |
3550 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3551 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3552 | * will either succeed because the page is now uptodate and unlocked, or it | |
3553 | * will register a callback when the page is unlocked at IO completion. Through | |
3554 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3555 | * That retry will attempt the buffered read again. The retry will generally | |
3556 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3557 | * async worker threads for a blocking retry. | |
3558 | */ | |
227c0c96 | 3559 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3560 | { |
e8c2bc1f JA |
3561 | struct io_async_rw *rw = req->async_data; |
3562 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3563 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3564 | |
bcf5a063 JA |
3565 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3566 | if (req->flags & REQ_F_NOWAIT) | |
3567 | return false; | |
f67676d1 | 3568 | |
227c0c96 | 3569 | /* Only for buffered IO */ |
3b2a4439 | 3570 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3571 | return false; |
3b2a4439 | 3572 | |
bcf5a063 JA |
3573 | /* |
3574 | * just use poll if we can, and don't attempt if the fs doesn't | |
3575 | * support callback based unlocks | |
3576 | */ | |
3577 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3578 | return false; | |
f67676d1 | 3579 | |
3b2a4439 JA |
3580 | wait->wait.func = io_async_buf_func; |
3581 | wait->wait.private = req; | |
3582 | wait->wait.flags = 0; | |
3583 | INIT_LIST_HEAD(&wait->wait.entry); | |
3584 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3585 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3586 | kiocb->ki_waitq = wait; |
3b2a4439 | 3587 | return true; |
bcf5a063 JA |
3588 | } |
3589 | ||
3590 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3591 | { | |
3592 | if (req->file->f_op->read_iter) | |
3593 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3594 | else if (req->file->f_op->read) |
4017eb91 | 3595 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3596 | else |
3597 | return -EINVAL; | |
f67676d1 JA |
3598 | } |
3599 | ||
889fca73 | 3600 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3601 | { |
3602 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3603 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3604 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3605 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3606 | ssize_t io_size, ret, ret2; |
45d189c6 | 3607 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3608 | |
2846c481 | 3609 | if (rw) { |
e8c2bc1f | 3610 | iter = &rw->iter; |
2846c481 PB |
3611 | iovec = NULL; |
3612 | } else { | |
3613 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3614 | if (ret < 0) | |
3615 | return ret; | |
3616 | } | |
632546c4 | 3617 | io_size = iov_iter_count(iter); |
fa15bafb | 3618 | req->result = io_size; |
2b188cc1 | 3619 | |
fd6c2e4c JA |
3620 | /* Ensure we clear previously set non-block flag */ |
3621 | if (!force_nonblock) | |
29de5f6a | 3622 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3623 | else |
3624 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3625 | ||
24c74678 | 3626 | /* If the file doesn't support async, just async punt */ |
6713e7a6 PB |
3627 | if (force_nonblock && !io_file_supports_async(req->file, READ)) { |
3628 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
6bf985dc | 3629 | return ret ?: -EAGAIN; |
6713e7a6 | 3630 | } |
9e645e11 | 3631 | |
632546c4 | 3632 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3633 | if (unlikely(ret)) { |
3634 | kfree(iovec); | |
3635 | return ret; | |
3636 | } | |
2b188cc1 | 3637 | |
227c0c96 | 3638 | ret = io_iter_do_read(req, iter); |
32960613 | 3639 | |
57cd657b | 3640 | if (ret == -EIOCBQUEUED) { |
5ea5dd45 PB |
3641 | /* it's faster to check here then delegate to kfree */ |
3642 | if (iovec) | |
3643 | kfree(iovec); | |
3644 | return 0; | |
227c0c96 | 3645 | } else if (ret == -EAGAIN) { |
eefdf30f JA |
3646 | /* IOPOLL retry should happen for io-wq threads */ |
3647 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3648 | goto done; |
75c668cd PB |
3649 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3650 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3651 | goto done; |
84216315 | 3652 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3653 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3654 | ret = 0; |
7335e3bf | 3655 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3656 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3657 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3658 | goto done; |
1a2cc0ce | 3659 | } |
227c0c96 | 3660 | |
227c0c96 | 3661 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3662 | if (ret2) |
3663 | return ret2; | |
3664 | ||
e8c2bc1f | 3665 | rw = req->async_data; |
227c0c96 | 3666 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3667 | iter = &rw->iter; |
227c0c96 | 3668 | |
b23df91b PB |
3669 | do { |
3670 | io_size -= ret; | |
3671 | rw->bytes_done += ret; | |
3672 | /* if we can retry, do so with the callbacks armed */ | |
3673 | if (!io_rw_should_retry(req)) { | |
3674 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3675 | return -EAGAIN; | |
3676 | } | |
3677 | ||
3678 | /* | |
3679 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3680 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3681 | * desired page gets unlocked. We can also get a partial read | |
3682 | * here, and if we do, then just retry at the new offset. | |
3683 | */ | |
3684 | ret = io_iter_do_read(req, iter); | |
3685 | if (ret == -EIOCBQUEUED) | |
3686 | return 0; | |
3687 | /* we got some bytes, but not all. retry. */ | |
3688 | } while (ret > 0 && ret < io_size); | |
227c0c96 | 3689 | done: |
889fca73 | 3690 | kiocb_done(kiocb, ret, issue_flags); |
5ea5dd45 | 3691 | return 0; |
2b188cc1 JA |
3692 | } |
3693 | ||
73debe68 | 3694 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3695 | { |
3696 | ssize_t ret; | |
3697 | ||
a88fc400 | 3698 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3699 | if (ret) |
3700 | return ret; | |
f67676d1 | 3701 | |
3529d8c2 JA |
3702 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3703 | return -EBADF; | |
f67676d1 | 3704 | |
5f798bea | 3705 | /* either don't need iovec imported or already have it */ |
2d199895 | 3706 | if (!req->async_data) |
3529d8c2 | 3707 | return 0; |
73debe68 | 3708 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3709 | } |
3710 | ||
889fca73 | 3711 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3712 | { |
3713 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3714 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3715 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3716 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3717 | ssize_t ret, ret2, io_size; |
45d189c6 | 3718 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3719 | |
2846c481 | 3720 | if (rw) { |
e8c2bc1f | 3721 | iter = &rw->iter; |
2846c481 PB |
3722 | iovec = NULL; |
3723 | } else { | |
3724 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3725 | if (ret < 0) | |
3726 | return ret; | |
3727 | } | |
632546c4 | 3728 | io_size = iov_iter_count(iter); |
fa15bafb | 3729 | req->result = io_size; |
2b188cc1 | 3730 | |
fd6c2e4c JA |
3731 | /* Ensure we clear previously set non-block flag */ |
3732 | if (!force_nonblock) | |
a88fc400 PB |
3733 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3734 | else | |
3735 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3736 | |
24c74678 | 3737 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3738 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3739 | goto copy_iov; |
31b51510 | 3740 | |
10d59345 JA |
3741 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3742 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3743 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3744 | goto copy_iov; |
31b51510 | 3745 | |
632546c4 | 3746 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3747 | if (unlikely(ret)) |
3748 | goto out_free; | |
4ed734b0 | 3749 | |
fa15bafb PB |
3750 | /* |
3751 | * Open-code file_start_write here to grab freeze protection, | |
3752 | * which will be released by another thread in | |
3753 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3754 | * released so that it doesn't complain about the held lock when | |
3755 | * we return to userspace. | |
3756 | */ | |
3757 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3758 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3759 | __sb_writers_release(file_inode(req->file)->i_sb, |
3760 | SB_FREEZE_WRITE); | |
3761 | } | |
3762 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3763 | |
fa15bafb | 3764 | if (req->file->f_op->write_iter) |
ff6165b2 | 3765 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3766 | else if (req->file->f_op->write) |
4017eb91 | 3767 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3768 | else |
3769 | ret2 = -EINVAL; | |
4ed734b0 | 3770 | |
fa15bafb PB |
3771 | /* |
3772 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3773 | * retry them without IOCB_NOWAIT. | |
3774 | */ | |
3775 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3776 | ret2 = -EAGAIN; | |
75c668cd PB |
3777 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3778 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3779 | goto done; |
fa15bafb | 3780 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3781 | /* IOPOLL retry should happen for io-wq threads */ |
3782 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3783 | goto copy_iov; | |
355afaeb | 3784 | done: |
889fca73 | 3785 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3786 | } else { |
f67676d1 | 3787 | copy_iov: |
84216315 | 3788 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3789 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3790 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3791 | return ret ?: -EAGAIN; |
2b188cc1 | 3792 | } |
31b51510 | 3793 | out_free: |
f261c168 | 3794 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3795 | if (iovec) |
6f2cc166 | 3796 | kfree(iovec); |
2b188cc1 JA |
3797 | return ret; |
3798 | } | |
3799 | ||
80a261fd JA |
3800 | static int io_renameat_prep(struct io_kiocb *req, |
3801 | const struct io_uring_sqe *sqe) | |
3802 | { | |
3803 | struct io_rename *ren = &req->rename; | |
3804 | const char __user *oldf, *newf; | |
3805 | ||
3806 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3807 | return -EBADF; | |
3808 | ||
3809 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3810 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3811 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3812 | ren->new_dfd = READ_ONCE(sqe->len); | |
3813 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3814 | ||
3815 | ren->oldpath = getname(oldf); | |
3816 | if (IS_ERR(ren->oldpath)) | |
3817 | return PTR_ERR(ren->oldpath); | |
3818 | ||
3819 | ren->newpath = getname(newf); | |
3820 | if (IS_ERR(ren->newpath)) { | |
3821 | putname(ren->oldpath); | |
3822 | return PTR_ERR(ren->newpath); | |
3823 | } | |
3824 | ||
3825 | req->flags |= REQ_F_NEED_CLEANUP; | |
3826 | return 0; | |
3827 | } | |
3828 | ||
45d189c6 | 3829 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3830 | { |
3831 | struct io_rename *ren = &req->rename; | |
3832 | int ret; | |
3833 | ||
45d189c6 | 3834 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3835 | return -EAGAIN; |
3836 | ||
3837 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3838 | ren->newpath, ren->flags); | |
3839 | ||
3840 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3841 | if (ret < 0) | |
3842 | req_set_fail_links(req); | |
3843 | io_req_complete(req, ret); | |
3844 | return 0; | |
3845 | } | |
3846 | ||
14a1143b JA |
3847 | static int io_unlinkat_prep(struct io_kiocb *req, |
3848 | const struct io_uring_sqe *sqe) | |
3849 | { | |
3850 | struct io_unlink *un = &req->unlink; | |
3851 | const char __user *fname; | |
3852 | ||
3853 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3854 | return -EBADF; | |
3855 | ||
3856 | un->dfd = READ_ONCE(sqe->fd); | |
3857 | ||
3858 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3859 | if (un->flags & ~AT_REMOVEDIR) | |
3860 | return -EINVAL; | |
3861 | ||
3862 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3863 | un->filename = getname(fname); | |
3864 | if (IS_ERR(un->filename)) | |
3865 | return PTR_ERR(un->filename); | |
3866 | ||
3867 | req->flags |= REQ_F_NEED_CLEANUP; | |
3868 | return 0; | |
3869 | } | |
3870 | ||
45d189c6 | 3871 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3872 | { |
3873 | struct io_unlink *un = &req->unlink; | |
3874 | int ret; | |
3875 | ||
45d189c6 | 3876 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3877 | return -EAGAIN; |
3878 | ||
3879 | if (un->flags & AT_REMOVEDIR) | |
3880 | ret = do_rmdir(un->dfd, un->filename); | |
3881 | else | |
3882 | ret = do_unlinkat(un->dfd, un->filename); | |
3883 | ||
3884 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3885 | if (ret < 0) | |
3886 | req_set_fail_links(req); | |
3887 | io_req_complete(req, ret); | |
3888 | return 0; | |
3889 | } | |
3890 | ||
36f4fa68 JA |
3891 | static int io_shutdown_prep(struct io_kiocb *req, |
3892 | const struct io_uring_sqe *sqe) | |
3893 | { | |
3894 | #if defined(CONFIG_NET) | |
3895 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3896 | return -EINVAL; | |
3897 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3898 | sqe->buf_index) | |
3899 | return -EINVAL; | |
3900 | ||
3901 | req->shutdown.how = READ_ONCE(sqe->len); | |
3902 | return 0; | |
3903 | #else | |
3904 | return -EOPNOTSUPP; | |
3905 | #endif | |
3906 | } | |
3907 | ||
45d189c6 | 3908 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3909 | { |
3910 | #if defined(CONFIG_NET) | |
3911 | struct socket *sock; | |
3912 | int ret; | |
3913 | ||
45d189c6 | 3914 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3915 | return -EAGAIN; |
3916 | ||
48aba79b | 3917 | sock = sock_from_file(req->file); |
36f4fa68 | 3918 | if (unlikely(!sock)) |
48aba79b | 3919 | return -ENOTSOCK; |
36f4fa68 JA |
3920 | |
3921 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d JA |
3922 | if (ret < 0) |
3923 | req_set_fail_links(req); | |
36f4fa68 JA |
3924 | io_req_complete(req, ret); |
3925 | return 0; | |
3926 | #else | |
3927 | return -EOPNOTSUPP; | |
3928 | #endif | |
3929 | } | |
3930 | ||
f2a8d5c7 PB |
3931 | static int __io_splice_prep(struct io_kiocb *req, |
3932 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3933 | { |
3934 | struct io_splice* sp = &req->splice; | |
3935 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3936 | |
3232dd02 PB |
3937 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3938 | return -EINVAL; | |
7d67af2c PB |
3939 | |
3940 | sp->file_in = NULL; | |
7d67af2c PB |
3941 | sp->len = READ_ONCE(sqe->len); |
3942 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3943 | ||
3944 | if (unlikely(sp->flags & ~valid_flags)) | |
3945 | return -EINVAL; | |
3946 | ||
8371adf5 PB |
3947 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3948 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3949 | if (!sp->file_in) | |
3950 | return -EBADF; | |
7d67af2c PB |
3951 | req->flags |= REQ_F_NEED_CLEANUP; |
3952 | ||
7cdaf587 XW |
3953 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3954 | /* | |
3955 | * Splice operation will be punted aync, and here need to | |
3956 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3957 | */ | |
3958 | io_req_init_async(req); | |
7d67af2c | 3959 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3960 | } |
7d67af2c PB |
3961 | |
3962 | return 0; | |
3963 | } | |
3964 | ||
f2a8d5c7 PB |
3965 | static int io_tee_prep(struct io_kiocb *req, |
3966 | const struct io_uring_sqe *sqe) | |
3967 | { | |
3968 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3969 | return -EINVAL; | |
3970 | return __io_splice_prep(req, sqe); | |
3971 | } | |
3972 | ||
45d189c6 | 3973 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3974 | { |
3975 | struct io_splice *sp = &req->splice; | |
3976 | struct file *in = sp->file_in; | |
3977 | struct file *out = sp->file_out; | |
3978 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3979 | long ret = 0; | |
3980 | ||
45d189c6 | 3981 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3982 | return -EAGAIN; |
3983 | if (sp->len) | |
3984 | ret = do_tee(in, out, sp->len, flags); | |
3985 | ||
3986 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3987 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3988 | ||
f2a8d5c7 PB |
3989 | if (ret != sp->len) |
3990 | req_set_fail_links(req); | |
e1e16097 | 3991 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3992 | return 0; |
3993 | } | |
3994 | ||
3995 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3996 | { | |
3997 | struct io_splice* sp = &req->splice; | |
3998 | ||
3999 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4000 | sp->off_out = READ_ONCE(sqe->off); | |
4001 | return __io_splice_prep(req, sqe); | |
4002 | } | |
4003 | ||
45d189c6 | 4004 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4005 | { |
4006 | struct io_splice *sp = &req->splice; | |
4007 | struct file *in = sp->file_in; | |
4008 | struct file *out = sp->file_out; | |
4009 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4010 | loff_t *poff_in, *poff_out; | |
c9687426 | 4011 | long ret = 0; |
7d67af2c | 4012 | |
45d189c6 | 4013 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4014 | return -EAGAIN; |
7d67af2c PB |
4015 | |
4016 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4017 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4018 | |
948a7749 | 4019 | if (sp->len) |
c9687426 | 4020 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
4021 | |
4022 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
4023 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4024 | ||
7d67af2c PB |
4025 | if (ret != sp->len) |
4026 | req_set_fail_links(req); | |
e1e16097 | 4027 | io_req_complete(req, ret); |
7d67af2c PB |
4028 | return 0; |
4029 | } | |
4030 | ||
2b188cc1 JA |
4031 | /* |
4032 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4033 | */ | |
889fca73 | 4034 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4035 | { |
4036 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4037 | |
def596e9 JA |
4038 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4039 | return -EINVAL; | |
4040 | ||
889fca73 | 4041 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4042 | return 0; |
4043 | } | |
4044 | ||
3529d8c2 | 4045 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4046 | { |
6b06314c | 4047 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4048 | |
09bb8394 JA |
4049 | if (!req->file) |
4050 | return -EBADF; | |
c992fe29 | 4051 | |
6b06314c | 4052 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4053 | return -EINVAL; |
edafccee | 4054 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
4055 | return -EINVAL; |
4056 | ||
8ed8d3c3 JA |
4057 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4058 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4059 | return -EINVAL; | |
4060 | ||
4061 | req->sync.off = READ_ONCE(sqe->off); | |
4062 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4063 | return 0; |
4064 | } | |
4065 | ||
45d189c6 | 4066 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4067 | { |
8ed8d3c3 | 4068 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4069 | int ret; |
4070 | ||
ac45abc0 | 4071 | /* fsync always requires a blocking context */ |
45d189c6 | 4072 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4073 | return -EAGAIN; |
4074 | ||
9adbd45d | 4075 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4076 | end > 0 ? end : LLONG_MAX, |
4077 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4078 | if (ret < 0) | |
4079 | req_set_fail_links(req); | |
e1e16097 | 4080 | io_req_complete(req, ret); |
c992fe29 CH |
4081 | return 0; |
4082 | } | |
4083 | ||
d63d1b5e JA |
4084 | static int io_fallocate_prep(struct io_kiocb *req, |
4085 | const struct io_uring_sqe *sqe) | |
4086 | { | |
4087 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
4088 | return -EINVAL; | |
3232dd02 PB |
4089 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4090 | return -EINVAL; | |
d63d1b5e JA |
4091 | |
4092 | req->sync.off = READ_ONCE(sqe->off); | |
4093 | req->sync.len = READ_ONCE(sqe->addr); | |
4094 | req->sync.mode = READ_ONCE(sqe->len); | |
4095 | return 0; | |
4096 | } | |
4097 | ||
45d189c6 | 4098 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4099 | { |
ac45abc0 PB |
4100 | int ret; |
4101 | ||
d63d1b5e | 4102 | /* fallocate always requiring blocking context */ |
45d189c6 | 4103 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4104 | return -EAGAIN; |
ac45abc0 PB |
4105 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4106 | req->sync.len); | |
ac45abc0 PB |
4107 | if (ret < 0) |
4108 | req_set_fail_links(req); | |
e1e16097 | 4109 | io_req_complete(req, ret); |
5d17b4a4 JA |
4110 | return 0; |
4111 | } | |
4112 | ||
ec65fea5 | 4113 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4114 | { |
f8748881 | 4115 | const char __user *fname; |
15b71abe | 4116 | int ret; |
b7bb4f7d | 4117 | |
ec65fea5 | 4118 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4119 | return -EINVAL; |
ec65fea5 | 4120 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4121 | return -EBADF; |
03b1230c | 4122 | |
ec65fea5 PB |
4123 | /* open.how should be already initialised */ |
4124 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4125 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4126 | |
25e72d10 PB |
4127 | req->open.dfd = READ_ONCE(sqe->fd); |
4128 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4129 | req->open.filename = getname(fname); |
15b71abe JA |
4130 | if (IS_ERR(req->open.filename)) { |
4131 | ret = PTR_ERR(req->open.filename); | |
4132 | req->open.filename = NULL; | |
4133 | return ret; | |
4134 | } | |
4022e7af | 4135 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4136 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4137 | return 0; |
03b1230c JA |
4138 | } |
4139 | ||
ec65fea5 PB |
4140 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4141 | { | |
4142 | u64 flags, mode; | |
4143 | ||
14587a46 | 4144 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4145 | return -EINVAL; |
ec65fea5 PB |
4146 | mode = READ_ONCE(sqe->len); |
4147 | flags = READ_ONCE(sqe->open_flags); | |
4148 | req->open.how = build_open_how(flags, mode); | |
4149 | return __io_openat_prep(req, sqe); | |
4150 | } | |
4151 | ||
cebdb986 | 4152 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4153 | { |
cebdb986 | 4154 | struct open_how __user *how; |
cebdb986 | 4155 | size_t len; |
0fa03c62 JA |
4156 | int ret; |
4157 | ||
14587a46 | 4158 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4159 | return -EINVAL; |
cebdb986 JA |
4160 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4161 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4162 | if (len < OPEN_HOW_SIZE_VER0) |
4163 | return -EINVAL; | |
3529d8c2 | 4164 | |
cebdb986 JA |
4165 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4166 | len); | |
4167 | if (ret) | |
4168 | return ret; | |
3529d8c2 | 4169 | |
ec65fea5 | 4170 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4171 | } |
4172 | ||
45d189c6 | 4173 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4174 | { |
4175 | struct open_flags op; | |
15b71abe | 4176 | struct file *file; |
3a81fd02 JA |
4177 | bool nonblock_set; |
4178 | bool resolve_nonblock; | |
15b71abe JA |
4179 | int ret; |
4180 | ||
cebdb986 | 4181 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4182 | if (ret) |
4183 | goto err; | |
3a81fd02 JA |
4184 | nonblock_set = op.open_flag & O_NONBLOCK; |
4185 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4186 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4187 | /* |
4188 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4189 | * it'll always -EAGAIN | |
4190 | */ | |
4191 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4192 | return -EAGAIN; | |
4193 | op.lookup_flags |= LOOKUP_CACHED; | |
4194 | op.open_flag |= O_NONBLOCK; | |
4195 | } | |
15b71abe | 4196 | |
4022e7af | 4197 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4198 | if (ret < 0) |
4199 | goto err; | |
4200 | ||
4201 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3a81fd02 | 4202 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
45d189c6 PB |
4203 | if ((!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK)) && |
4204 | file == ERR_PTR(-EAGAIN)) { | |
3a81fd02 JA |
4205 | /* |
4206 | * We could hang on to this 'fd', but seems like marginal | |
4207 | * gain for something that is now known to be a slower path. | |
4208 | * So just put it, and we'll get a new one when we retry. | |
4209 | */ | |
4210 | put_unused_fd(ret); | |
4211 | return -EAGAIN; | |
4212 | } | |
4213 | ||
15b71abe JA |
4214 | if (IS_ERR(file)) { |
4215 | put_unused_fd(ret); | |
4216 | ret = PTR_ERR(file); | |
4217 | } else { | |
45d189c6 | 4218 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) |
3a81fd02 | 4219 | file->f_flags &= ~O_NONBLOCK; |
15b71abe JA |
4220 | fsnotify_open(file); |
4221 | fd_install(ret, file); | |
4222 | } | |
4223 | err: | |
4224 | putname(req->open.filename); | |
8fef80bf | 4225 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4226 | if (ret < 0) |
4227 | req_set_fail_links(req); | |
e1e16097 | 4228 | io_req_complete(req, ret); |
15b71abe JA |
4229 | return 0; |
4230 | } | |
4231 | ||
45d189c6 | 4232 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4233 | { |
45d189c6 | 4234 | return io_openat2(req, issue_flags & IO_URING_F_NONBLOCK); |
cebdb986 JA |
4235 | } |
4236 | ||
067524e9 JA |
4237 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4238 | const struct io_uring_sqe *sqe) | |
4239 | { | |
4240 | struct io_provide_buf *p = &req->pbuf; | |
4241 | u64 tmp; | |
4242 | ||
4243 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4244 | return -EINVAL; | |
4245 | ||
4246 | tmp = READ_ONCE(sqe->fd); | |
4247 | if (!tmp || tmp > USHRT_MAX) | |
4248 | return -EINVAL; | |
4249 | ||
4250 | memset(p, 0, sizeof(*p)); | |
4251 | p->nbufs = tmp; | |
4252 | p->bgid = READ_ONCE(sqe->buf_group); | |
4253 | return 0; | |
4254 | } | |
4255 | ||
4256 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4257 | int bgid, unsigned nbufs) | |
4258 | { | |
4259 | unsigned i = 0; | |
4260 | ||
4261 | /* shouldn't happen */ | |
4262 | if (!nbufs) | |
4263 | return 0; | |
4264 | ||
4265 | /* the head kbuf is the list itself */ | |
4266 | while (!list_empty(&buf->list)) { | |
4267 | struct io_buffer *nxt; | |
4268 | ||
4269 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4270 | list_del(&nxt->list); | |
4271 | kfree(nxt); | |
4272 | if (++i == nbufs) | |
4273 | return i; | |
4274 | } | |
4275 | i++; | |
4276 | kfree(buf); | |
4277 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4278 | ||
4279 | return i; | |
4280 | } | |
4281 | ||
889fca73 | 4282 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4283 | { |
4284 | struct io_provide_buf *p = &req->pbuf; | |
4285 | struct io_ring_ctx *ctx = req->ctx; | |
4286 | struct io_buffer *head; | |
4287 | int ret = 0; | |
45d189c6 | 4288 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4289 | |
4290 | io_ring_submit_lock(ctx, !force_nonblock); | |
4291 | ||
4292 | lockdep_assert_held(&ctx->uring_lock); | |
4293 | ||
4294 | ret = -ENOENT; | |
4295 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4296 | if (head) | |
4297 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 JA |
4298 | if (ret < 0) |
4299 | req_set_fail_links(req); | |
067524e9 | 4300 | |
31bff9a5 PB |
4301 | /* need to hold the lock to complete IOPOLL requests */ |
4302 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4303 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4304 | io_ring_submit_unlock(ctx, !force_nonblock); |
4305 | } else { | |
4306 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4307 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4308 | } |
067524e9 JA |
4309 | return 0; |
4310 | } | |
4311 | ||
ddf0322d JA |
4312 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4313 | const struct io_uring_sqe *sqe) | |
4314 | { | |
4315 | struct io_provide_buf *p = &req->pbuf; | |
4316 | u64 tmp; | |
4317 | ||
4318 | if (sqe->ioprio || sqe->rw_flags) | |
4319 | return -EINVAL; | |
4320 | ||
4321 | tmp = READ_ONCE(sqe->fd); | |
4322 | if (!tmp || tmp > USHRT_MAX) | |
4323 | return -E2BIG; | |
4324 | p->nbufs = tmp; | |
4325 | p->addr = READ_ONCE(sqe->addr); | |
4326 | p->len = READ_ONCE(sqe->len); | |
4327 | ||
efe68c1c | 4328 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4329 | return -EFAULT; |
4330 | ||
4331 | p->bgid = READ_ONCE(sqe->buf_group); | |
4332 | tmp = READ_ONCE(sqe->off); | |
4333 | if (tmp > USHRT_MAX) | |
4334 | return -E2BIG; | |
4335 | p->bid = tmp; | |
4336 | return 0; | |
4337 | } | |
4338 | ||
4339 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4340 | { | |
4341 | struct io_buffer *buf; | |
4342 | u64 addr = pbuf->addr; | |
4343 | int i, bid = pbuf->bid; | |
4344 | ||
4345 | for (i = 0; i < pbuf->nbufs; i++) { | |
4346 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4347 | if (!buf) | |
4348 | break; | |
4349 | ||
4350 | buf->addr = addr; | |
4351 | buf->len = pbuf->len; | |
4352 | buf->bid = bid; | |
4353 | addr += pbuf->len; | |
4354 | bid++; | |
4355 | if (!*head) { | |
4356 | INIT_LIST_HEAD(&buf->list); | |
4357 | *head = buf; | |
4358 | } else { | |
4359 | list_add_tail(&buf->list, &(*head)->list); | |
4360 | } | |
4361 | } | |
4362 | ||
4363 | return i ? i : -ENOMEM; | |
4364 | } | |
4365 | ||
889fca73 | 4366 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4367 | { |
4368 | struct io_provide_buf *p = &req->pbuf; | |
4369 | struct io_ring_ctx *ctx = req->ctx; | |
4370 | struct io_buffer *head, *list; | |
4371 | int ret = 0; | |
45d189c6 | 4372 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4373 | |
4374 | io_ring_submit_lock(ctx, !force_nonblock); | |
4375 | ||
4376 | lockdep_assert_held(&ctx->uring_lock); | |
4377 | ||
4378 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4379 | ||
4380 | ret = io_add_buffers(p, &head); | |
4381 | if (ret < 0) | |
4382 | goto out; | |
4383 | ||
4384 | if (!list) { | |
4385 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4386 | GFP_KERNEL); | |
4387 | if (ret < 0) { | |
067524e9 | 4388 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4389 | goto out; |
4390 | } | |
4391 | } | |
4392 | out: | |
ddf0322d JA |
4393 | if (ret < 0) |
4394 | req_set_fail_links(req); | |
31bff9a5 PB |
4395 | |
4396 | /* need to hold the lock to complete IOPOLL requests */ | |
4397 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4398 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4399 | io_ring_submit_unlock(ctx, !force_nonblock); |
4400 | } else { | |
4401 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4402 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4403 | } |
ddf0322d | 4404 | return 0; |
cebdb986 JA |
4405 | } |
4406 | ||
3e4827b0 JA |
4407 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4408 | const struct io_uring_sqe *sqe) | |
4409 | { | |
4410 | #if defined(CONFIG_EPOLL) | |
4411 | if (sqe->ioprio || sqe->buf_index) | |
4412 | return -EINVAL; | |
6ca56f84 | 4413 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4414 | return -EINVAL; |
3e4827b0 JA |
4415 | |
4416 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4417 | req->epoll.op = READ_ONCE(sqe->len); | |
4418 | req->epoll.fd = READ_ONCE(sqe->off); | |
4419 | ||
4420 | if (ep_op_has_event(req->epoll.op)) { | |
4421 | struct epoll_event __user *ev; | |
4422 | ||
4423 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4424 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4425 | return -EFAULT; | |
4426 | } | |
4427 | ||
4428 | return 0; | |
4429 | #else | |
4430 | return -EOPNOTSUPP; | |
4431 | #endif | |
4432 | } | |
4433 | ||
889fca73 | 4434 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4435 | { |
4436 | #if defined(CONFIG_EPOLL) | |
4437 | struct io_epoll *ie = &req->epoll; | |
4438 | int ret; | |
45d189c6 | 4439 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4440 | |
4441 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4442 | if (force_nonblock && ret == -EAGAIN) | |
4443 | return -EAGAIN; | |
4444 | ||
4445 | if (ret < 0) | |
4446 | req_set_fail_links(req); | |
889fca73 | 4447 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4448 | return 0; |
4449 | #else | |
4450 | return -EOPNOTSUPP; | |
4451 | #endif | |
4452 | } | |
4453 | ||
c1ca757b JA |
4454 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4455 | { | |
4456 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4457 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4458 | return -EINVAL; | |
3232dd02 PB |
4459 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4460 | return -EINVAL; | |
c1ca757b JA |
4461 | |
4462 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4463 | req->madvise.len = READ_ONCE(sqe->len); | |
4464 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4465 | return 0; | |
4466 | #else | |
4467 | return -EOPNOTSUPP; | |
4468 | #endif | |
4469 | } | |
4470 | ||
45d189c6 | 4471 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4472 | { |
4473 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4474 | struct io_madvise *ma = &req->madvise; | |
4475 | int ret; | |
4476 | ||
45d189c6 | 4477 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4478 | return -EAGAIN; |
4479 | ||
0726b01e | 4480 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4481 | if (ret < 0) |
4482 | req_set_fail_links(req); | |
e1e16097 | 4483 | io_req_complete(req, ret); |
c1ca757b JA |
4484 | return 0; |
4485 | #else | |
4486 | return -EOPNOTSUPP; | |
4487 | #endif | |
4488 | } | |
4489 | ||
4840e418 JA |
4490 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4491 | { | |
4492 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4493 | return -EINVAL; | |
3232dd02 PB |
4494 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4495 | return -EINVAL; | |
4840e418 JA |
4496 | |
4497 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4498 | req->fadvise.len = READ_ONCE(sqe->len); | |
4499 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4500 | return 0; | |
4501 | } | |
4502 | ||
45d189c6 | 4503 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4504 | { |
4505 | struct io_fadvise *fa = &req->fadvise; | |
4506 | int ret; | |
4507 | ||
45d189c6 | 4508 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4509 | switch (fa->advice) { |
4510 | case POSIX_FADV_NORMAL: | |
4511 | case POSIX_FADV_RANDOM: | |
4512 | case POSIX_FADV_SEQUENTIAL: | |
4513 | break; | |
4514 | default: | |
4515 | return -EAGAIN; | |
4516 | } | |
4517 | } | |
4840e418 JA |
4518 | |
4519 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4520 | if (ret < 0) | |
4521 | req_set_fail_links(req); | |
e1e16097 | 4522 | io_req_complete(req, ret); |
4840e418 JA |
4523 | return 0; |
4524 | } | |
4525 | ||
eddc7ef5 JA |
4526 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4527 | { | |
6ca56f84 | 4528 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4529 | return -EINVAL; |
eddc7ef5 JA |
4530 | if (sqe->ioprio || sqe->buf_index) |
4531 | return -EINVAL; | |
9c280f90 | 4532 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4533 | return -EBADF; |
eddc7ef5 | 4534 | |
1d9e1288 BM |
4535 | req->statx.dfd = READ_ONCE(sqe->fd); |
4536 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4537 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4538 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4539 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4540 | |
4541 | return 0; | |
4542 | } | |
4543 | ||
45d189c6 | 4544 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4545 | { |
1d9e1288 | 4546 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4547 | int ret; |
4548 | ||
45d189c6 | 4549 | if (issue_flags & IO_URING_F_NONBLOCK) { |
5b0bbee4 JA |
4550 | /* only need file table for an actual valid fd */ |
4551 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4552 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4553 | return -EAGAIN; |
5b0bbee4 | 4554 | } |
eddc7ef5 | 4555 | |
e62753e4 BM |
4556 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4557 | ctx->buffer); | |
eddc7ef5 | 4558 | |
eddc7ef5 JA |
4559 | if (ret < 0) |
4560 | req_set_fail_links(req); | |
e1e16097 | 4561 | io_req_complete(req, ret); |
eddc7ef5 JA |
4562 | return 0; |
4563 | } | |
4564 | ||
b5dba59e JA |
4565 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4566 | { | |
14587a46 | 4567 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4568 | return -EINVAL; |
b5dba59e JA |
4569 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4570 | sqe->rw_flags || sqe->buf_index) | |
4571 | return -EINVAL; | |
9c280f90 | 4572 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4573 | return -EBADF; |
b5dba59e JA |
4574 | |
4575 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4576 | return 0; |
b5dba59e JA |
4577 | } |
4578 | ||
889fca73 | 4579 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4580 | { |
9eac1904 | 4581 | struct files_struct *files = current->files; |
3af73b28 | 4582 | struct io_close *close = &req->close; |
9eac1904 JA |
4583 | struct fdtable *fdt; |
4584 | struct file *file; | |
b5dba59e JA |
4585 | int ret; |
4586 | ||
9eac1904 JA |
4587 | file = NULL; |
4588 | ret = -EBADF; | |
4589 | spin_lock(&files->file_lock); | |
4590 | fdt = files_fdtable(files); | |
4591 | if (close->fd >= fdt->max_fds) { | |
4592 | spin_unlock(&files->file_lock); | |
4593 | goto err; | |
4594 | } | |
4595 | file = fdt->fd[close->fd]; | |
4596 | if (!file) { | |
4597 | spin_unlock(&files->file_lock); | |
4598 | goto err; | |
4599 | } | |
4600 | ||
4601 | if (file->f_op == &io_uring_fops) { | |
4602 | spin_unlock(&files->file_lock); | |
4603 | file = NULL; | |
4604 | goto err; | |
3af73b28 | 4605 | } |
b5dba59e JA |
4606 | |
4607 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4608 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4609 | spin_unlock(&files->file_lock); |
0bf0eefd | 4610 | return -EAGAIN; |
a2100672 | 4611 | } |
b5dba59e | 4612 | |
9eac1904 JA |
4613 | ret = __close_fd_get_file(close->fd, &file); |
4614 | spin_unlock(&files->file_lock); | |
4615 | if (ret < 0) { | |
4616 | if (ret == -ENOENT) | |
4617 | ret = -EBADF; | |
4618 | goto err; | |
4619 | } | |
4620 | ||
3af73b28 | 4621 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4622 | ret = filp_close(file, current->files); |
4623 | err: | |
3af73b28 PB |
4624 | if (ret < 0) |
4625 | req_set_fail_links(req); | |
9eac1904 JA |
4626 | if (file) |
4627 | fput(file); | |
889fca73 | 4628 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4629 | return 0; |
b5dba59e JA |
4630 | } |
4631 | ||
3529d8c2 | 4632 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4633 | { |
4634 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4635 | |
4636 | if (!req->file) | |
4637 | return -EBADF; | |
5d17b4a4 JA |
4638 | |
4639 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4640 | return -EINVAL; | |
4641 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4642 | return -EINVAL; | |
4643 | ||
8ed8d3c3 JA |
4644 | req->sync.off = READ_ONCE(sqe->off); |
4645 | req->sync.len = READ_ONCE(sqe->len); | |
4646 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4647 | return 0; |
4648 | } | |
4649 | ||
45d189c6 | 4650 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4651 | { |
8ed8d3c3 JA |
4652 | int ret; |
4653 | ||
ac45abc0 | 4654 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4655 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4656 | return -EAGAIN; |
4657 | ||
9adbd45d | 4658 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4659 | req->sync.flags); |
4660 | if (ret < 0) | |
4661 | req_set_fail_links(req); | |
e1e16097 | 4662 | io_req_complete(req, ret); |
5d17b4a4 JA |
4663 | return 0; |
4664 | } | |
4665 | ||
469956e8 | 4666 | #if defined(CONFIG_NET) |
02d27d89 PB |
4667 | static int io_setup_async_msg(struct io_kiocb *req, |
4668 | struct io_async_msghdr *kmsg) | |
4669 | { | |
e8c2bc1f JA |
4670 | struct io_async_msghdr *async_msg = req->async_data; |
4671 | ||
4672 | if (async_msg) | |
02d27d89 | 4673 | return -EAGAIN; |
e8c2bc1f | 4674 | if (io_alloc_async_data(req)) { |
257e84a5 | 4675 | kfree(kmsg->free_iov); |
02d27d89 PB |
4676 | return -ENOMEM; |
4677 | } | |
e8c2bc1f | 4678 | async_msg = req->async_data; |
02d27d89 | 4679 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4680 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4681 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4682 | /* if were using fast_iov, set it to the new one */ |
4683 | if (!async_msg->free_iov) | |
4684 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4685 | ||
02d27d89 PB |
4686 | return -EAGAIN; |
4687 | } | |
4688 | ||
2ae523ed PB |
4689 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4690 | struct io_async_msghdr *iomsg) | |
4691 | { | |
2ae523ed | 4692 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4693 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4694 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4695 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4696 | } |
4697 | ||
3529d8c2 | 4698 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4699 | { |
e8c2bc1f | 4700 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4701 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4702 | int ret; |
03b1230c | 4703 | |
d2b6f48b PB |
4704 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4705 | return -EINVAL; | |
4706 | ||
e47293fd | 4707 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4708 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4709 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4710 | |
d8768362 JA |
4711 | #ifdef CONFIG_COMPAT |
4712 | if (req->ctx->compat) | |
4713 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4714 | #endif | |
4715 | ||
e8c2bc1f | 4716 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4717 | return 0; |
e8c2bc1f | 4718 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4719 | if (!ret) |
4720 | req->flags |= REQ_F_NEED_CLEANUP; | |
4721 | return ret; | |
03b1230c JA |
4722 | } |
4723 | ||
889fca73 | 4724 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4725 | { |
6b754c8b | 4726 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4727 | struct socket *sock; |
7a7cacba | 4728 | unsigned flags; |
0fa03c62 JA |
4729 | int ret; |
4730 | ||
dba4a925 | 4731 | sock = sock_from_file(req->file); |
7a7cacba | 4732 | if (unlikely(!sock)) |
dba4a925 | 4733 | return -ENOTSOCK; |
3529d8c2 | 4734 | |
257e84a5 PB |
4735 | kmsg = req->async_data; |
4736 | if (!kmsg) { | |
7a7cacba PB |
4737 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4738 | if (ret) | |
4739 | return ret; | |
4740 | kmsg = &iomsg; | |
0fa03c62 | 4741 | } |
0fa03c62 | 4742 | |
7a7cacba PB |
4743 | flags = req->sr_msg.msg_flags; |
4744 | if (flags & MSG_DONTWAIT) | |
4745 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4746 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4747 | flags |= MSG_DONTWAIT; |
e47293fd | 4748 | |
7a7cacba | 4749 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4750 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4751 | return io_setup_async_msg(req, kmsg); |
4752 | if (ret == -ERESTARTSYS) | |
4753 | ret = -EINTR; | |
0fa03c62 | 4754 | |
257e84a5 PB |
4755 | /* fast path, check for non-NULL to avoid function call */ |
4756 | if (kmsg->free_iov) | |
4757 | kfree(kmsg->free_iov); | |
99bc4c38 | 4758 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4759 | if (ret < 0) |
4760 | req_set_fail_links(req); | |
889fca73 | 4761 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4762 | return 0; |
03b1230c | 4763 | } |
aa1fa28f | 4764 | |
889fca73 | 4765 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4766 | { |
7a7cacba PB |
4767 | struct io_sr_msg *sr = &req->sr_msg; |
4768 | struct msghdr msg; | |
4769 | struct iovec iov; | |
fddaface | 4770 | struct socket *sock; |
7a7cacba | 4771 | unsigned flags; |
fddaface JA |
4772 | int ret; |
4773 | ||
dba4a925 | 4774 | sock = sock_from_file(req->file); |
7a7cacba | 4775 | if (unlikely(!sock)) |
dba4a925 | 4776 | return -ENOTSOCK; |
fddaface | 4777 | |
7a7cacba PB |
4778 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4779 | if (unlikely(ret)) | |
14db8411 | 4780 | return ret; |
fddaface | 4781 | |
7a7cacba PB |
4782 | msg.msg_name = NULL; |
4783 | msg.msg_control = NULL; | |
4784 | msg.msg_controllen = 0; | |
4785 | msg.msg_namelen = 0; | |
fddaface | 4786 | |
7a7cacba PB |
4787 | flags = req->sr_msg.msg_flags; |
4788 | if (flags & MSG_DONTWAIT) | |
4789 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4790 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4791 | flags |= MSG_DONTWAIT; |
fddaface | 4792 | |
7a7cacba PB |
4793 | msg.msg_flags = flags; |
4794 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4795 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4796 | return -EAGAIN; |
4797 | if (ret == -ERESTARTSYS) | |
4798 | ret = -EINTR; | |
fddaface | 4799 | |
fddaface JA |
4800 | if (ret < 0) |
4801 | req_set_fail_links(req); | |
889fca73 | 4802 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4803 | return 0; |
fddaface JA |
4804 | } |
4805 | ||
1400e697 PB |
4806 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4807 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4808 | { |
4809 | struct io_sr_msg *sr = &req->sr_msg; | |
4810 | struct iovec __user *uiov; | |
4811 | size_t iov_len; | |
4812 | int ret; | |
4813 | ||
1400e697 PB |
4814 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4815 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4816 | if (ret) |
4817 | return ret; | |
4818 | ||
4819 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4820 | if (iov_len > 1) | |
4821 | return -EINVAL; | |
5476dfed | 4822 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4823 | return -EFAULT; |
5476dfed | 4824 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4825 | iomsg->free_iov = NULL; |
52de1fe1 | 4826 | } else { |
257e84a5 | 4827 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4828 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4829 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4830 | false); |
52de1fe1 JA |
4831 | if (ret > 0) |
4832 | ret = 0; | |
4833 | } | |
4834 | ||
4835 | return ret; | |
4836 | } | |
4837 | ||
4838 | #ifdef CONFIG_COMPAT | |
4839 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4840 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4841 | { |
4842 | struct compat_msghdr __user *msg_compat; | |
4843 | struct io_sr_msg *sr = &req->sr_msg; | |
4844 | struct compat_iovec __user *uiov; | |
4845 | compat_uptr_t ptr; | |
4846 | compat_size_t len; | |
4847 | int ret; | |
4848 | ||
270a5940 | 4849 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4850 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4851 | &ptr, &len); |
4852 | if (ret) | |
4853 | return ret; | |
4854 | ||
4855 | uiov = compat_ptr(ptr); | |
4856 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4857 | compat_ssize_t clen; | |
4858 | ||
4859 | if (len > 1) | |
4860 | return -EINVAL; | |
4861 | if (!access_ok(uiov, sizeof(*uiov))) | |
4862 | return -EFAULT; | |
4863 | if (__get_user(clen, &uiov->iov_len)) | |
4864 | return -EFAULT; | |
4865 | if (clen < 0) | |
4866 | return -EINVAL; | |
2d280bc8 | 4867 | sr->len = clen; |
257e84a5 | 4868 | iomsg->free_iov = NULL; |
52de1fe1 | 4869 | } else { |
257e84a5 | 4870 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4871 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4872 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4873 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4874 | if (ret < 0) |
4875 | return ret; | |
4876 | } | |
4877 | ||
4878 | return 0; | |
4879 | } | |
4880 | #endif | |
4881 | ||
1400e697 PB |
4882 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4883 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4884 | { |
1400e697 | 4885 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4886 | |
4887 | #ifdef CONFIG_COMPAT | |
4888 | if (req->ctx->compat) | |
1400e697 | 4889 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4890 | #endif |
52de1fe1 | 4891 | |
1400e697 | 4892 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4893 | } |
4894 | ||
bcda7baa | 4895 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4896 | bool needs_lock) |
bcda7baa JA |
4897 | { |
4898 | struct io_sr_msg *sr = &req->sr_msg; | |
4899 | struct io_buffer *kbuf; | |
4900 | ||
bcda7baa JA |
4901 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4902 | if (IS_ERR(kbuf)) | |
4903 | return kbuf; | |
4904 | ||
4905 | sr->kbuf = kbuf; | |
4906 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4907 | return kbuf; |
fddaface JA |
4908 | } |
4909 | ||
7fbb1b54 PB |
4910 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4911 | { | |
4912 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4913 | } | |
4914 | ||
3529d8c2 JA |
4915 | static int io_recvmsg_prep(struct io_kiocb *req, |
4916 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4917 | { |
e8c2bc1f | 4918 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4919 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4920 | int ret; |
3529d8c2 | 4921 | |
d2b6f48b PB |
4922 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4923 | return -EINVAL; | |
4924 | ||
3529d8c2 | 4925 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4926 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4927 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4928 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4929 | |
d8768362 JA |
4930 | #ifdef CONFIG_COMPAT |
4931 | if (req->ctx->compat) | |
4932 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4933 | #endif | |
4934 | ||
e8c2bc1f | 4935 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4936 | return 0; |
e8c2bc1f | 4937 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4938 | if (!ret) |
4939 | req->flags |= REQ_F_NEED_CLEANUP; | |
4940 | return ret; | |
aa1fa28f JA |
4941 | } |
4942 | ||
889fca73 | 4943 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4944 | { |
6b754c8b | 4945 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4946 | struct socket *sock; |
7fbb1b54 | 4947 | struct io_buffer *kbuf; |
7a7cacba | 4948 | unsigned flags; |
52de1fe1 | 4949 | int ret, cflags = 0; |
45d189c6 | 4950 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4951 | |
dba4a925 | 4952 | sock = sock_from_file(req->file); |
7a7cacba | 4953 | if (unlikely(!sock)) |
dba4a925 | 4954 | return -ENOTSOCK; |
3529d8c2 | 4955 | |
257e84a5 PB |
4956 | kmsg = req->async_data; |
4957 | if (!kmsg) { | |
7a7cacba PB |
4958 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4959 | if (ret) | |
681fda8d | 4960 | return ret; |
7a7cacba PB |
4961 | kmsg = &iomsg; |
4962 | } | |
03b1230c | 4963 | |
bc02ef33 | 4964 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4965 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4966 | if (IS_ERR(kbuf)) |
52de1fe1 | 4967 | return PTR_ERR(kbuf); |
7a7cacba | 4968 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4969 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4970 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4971 | 1, req->sr_msg.len); |
4972 | } | |
52de1fe1 | 4973 | |
7a7cacba PB |
4974 | flags = req->sr_msg.msg_flags; |
4975 | if (flags & MSG_DONTWAIT) | |
4976 | req->flags |= REQ_F_NOWAIT; | |
4977 | else if (force_nonblock) | |
4978 | flags |= MSG_DONTWAIT; | |
e47293fd | 4979 | |
7a7cacba PB |
4980 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4981 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4982 | if (force_nonblock && ret == -EAGAIN) |
4983 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4984 | if (ret == -ERESTARTSYS) |
4985 | ret = -EINTR; | |
03b1230c | 4986 | |
7fbb1b54 PB |
4987 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4988 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4989 | /* fast path, check for non-NULL to avoid function call */ |
4990 | if (kmsg->free_iov) | |
4991 | kfree(kmsg->free_iov); | |
99bc4c38 | 4992 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4993 | if (ret < 0) |
4994 | req_set_fail_links(req); | |
889fca73 | 4995 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4996 | return 0; |
0fa03c62 | 4997 | } |
5d17b4a4 | 4998 | |
889fca73 | 4999 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5000 | { |
6b754c8b | 5001 | struct io_buffer *kbuf; |
7a7cacba PB |
5002 | struct io_sr_msg *sr = &req->sr_msg; |
5003 | struct msghdr msg; | |
5004 | void __user *buf = sr->buf; | |
fddaface | 5005 | struct socket *sock; |
7a7cacba PB |
5006 | struct iovec iov; |
5007 | unsigned flags; | |
bcda7baa | 5008 | int ret, cflags = 0; |
45d189c6 | 5009 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5010 | |
dba4a925 | 5011 | sock = sock_from_file(req->file); |
7a7cacba | 5012 | if (unlikely(!sock)) |
dba4a925 | 5013 | return -ENOTSOCK; |
fddaface | 5014 | |
bc02ef33 | 5015 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5016 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
5017 | if (IS_ERR(kbuf)) |
5018 | return PTR_ERR(kbuf); | |
7a7cacba | 5019 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5020 | } |
bcda7baa | 5021 | |
7a7cacba | 5022 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5023 | if (unlikely(ret)) |
5024 | goto out_free; | |
fddaface | 5025 | |
7a7cacba PB |
5026 | msg.msg_name = NULL; |
5027 | msg.msg_control = NULL; | |
5028 | msg.msg_controllen = 0; | |
5029 | msg.msg_namelen = 0; | |
5030 | msg.msg_iocb = NULL; | |
5031 | msg.msg_flags = 0; | |
fddaface | 5032 | |
7a7cacba PB |
5033 | flags = req->sr_msg.msg_flags; |
5034 | if (flags & MSG_DONTWAIT) | |
5035 | req->flags |= REQ_F_NOWAIT; | |
5036 | else if (force_nonblock) | |
5037 | flags |= MSG_DONTWAIT; | |
5038 | ||
5039 | ret = sock_recvmsg(sock, &msg, flags); | |
5040 | if (force_nonblock && ret == -EAGAIN) | |
5041 | return -EAGAIN; | |
5042 | if (ret == -ERESTARTSYS) | |
5043 | ret = -EINTR; | |
14c32eee | 5044 | out_free: |
7fbb1b54 PB |
5045 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5046 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
5047 | if (ret < 0) |
5048 | req_set_fail_links(req); | |
889fca73 | 5049 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5050 | return 0; |
fddaface JA |
5051 | } |
5052 | ||
3529d8c2 | 5053 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5054 | { |
8ed8d3c3 JA |
5055 | struct io_accept *accept = &req->accept; |
5056 | ||
14587a46 | 5057 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5058 | return -EINVAL; |
8042d6ce | 5059 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5060 | return -EINVAL; |
5061 | ||
d55e5f5b JA |
5062 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5063 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5064 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5065 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 5066 | return 0; |
8ed8d3c3 | 5067 | } |
17f2fe35 | 5068 | |
889fca73 | 5069 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5070 | { |
5071 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5072 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5073 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
5074 | int ret; |
5075 | ||
e697deed JX |
5076 | if (req->file->f_flags & O_NONBLOCK) |
5077 | req->flags |= REQ_F_NOWAIT; | |
5078 | ||
8ed8d3c3 | 5079 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
5080 | accept->addr_len, accept->flags, |
5081 | accept->nofile); | |
8ed8d3c3 | 5082 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 5083 | return -EAGAIN; |
ac45abc0 PB |
5084 | if (ret < 0) { |
5085 | if (ret == -ERESTARTSYS) | |
5086 | ret = -EINTR; | |
4e88d6e7 | 5087 | req_set_fail_links(req); |
ac45abc0 | 5088 | } |
889fca73 | 5089 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5090 | return 0; |
8ed8d3c3 JA |
5091 | } |
5092 | ||
3529d8c2 | 5093 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5094 | { |
3529d8c2 | 5095 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 5096 | struct io_async_connect *io = req->async_data; |
f499a021 | 5097 | |
14587a46 | 5098 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
5099 | return -EINVAL; |
5100 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
5101 | return -EINVAL; | |
5102 | ||
3529d8c2 JA |
5103 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5104 | conn->addr_len = READ_ONCE(sqe->addr2); | |
5105 | ||
5106 | if (!io) | |
5107 | return 0; | |
5108 | ||
5109 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 5110 | &io->address); |
f499a021 JA |
5111 | } |
5112 | ||
889fca73 | 5113 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5114 | { |
e8c2bc1f | 5115 | struct io_async_connect __io, *io; |
f8e85cf2 | 5116 | unsigned file_flags; |
3fbb51c1 | 5117 | int ret; |
45d189c6 | 5118 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5119 | |
e8c2bc1f JA |
5120 | if (req->async_data) { |
5121 | io = req->async_data; | |
f499a021 | 5122 | } else { |
3529d8c2 JA |
5123 | ret = move_addr_to_kernel(req->connect.addr, |
5124 | req->connect.addr_len, | |
e8c2bc1f | 5125 | &__io.address); |
f499a021 JA |
5126 | if (ret) |
5127 | goto out; | |
5128 | io = &__io; | |
5129 | } | |
5130 | ||
3fbb51c1 JA |
5131 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5132 | ||
e8c2bc1f | 5133 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5134 | req->connect.addr_len, file_flags); |
87f80d62 | 5135 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5136 | if (req->async_data) |
b7bb4f7d | 5137 | return -EAGAIN; |
e8c2bc1f | 5138 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5139 | ret = -ENOMEM; |
5140 | goto out; | |
5141 | } | |
e8c2bc1f JA |
5142 | io = req->async_data; |
5143 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 5144 | return -EAGAIN; |
f499a021 | 5145 | } |
f8e85cf2 JA |
5146 | if (ret == -ERESTARTSYS) |
5147 | ret = -EINTR; | |
f499a021 | 5148 | out: |
4e88d6e7 JA |
5149 | if (ret < 0) |
5150 | req_set_fail_links(req); | |
889fca73 | 5151 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5152 | return 0; |
469956e8 Y |
5153 | } |
5154 | #else /* !CONFIG_NET */ | |
5155 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5156 | { | |
f8e85cf2 | 5157 | return -EOPNOTSUPP; |
f8e85cf2 JA |
5158 | } |
5159 | ||
889fca73 | 5160 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5161 | { |
5162 | return -EOPNOTSUPP; | |
5163 | } | |
5164 | ||
889fca73 | 5165 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5166 | { |
5167 | return -EOPNOTSUPP; | |
5168 | } | |
5169 | ||
5170 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5171 | const struct io_uring_sqe *sqe) | |
5172 | { | |
5173 | return -EOPNOTSUPP; | |
5174 | } | |
5175 | ||
889fca73 | 5176 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5177 | { |
5178 | return -EOPNOTSUPP; | |
5179 | } | |
5180 | ||
889fca73 | 5181 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5182 | { |
5183 | return -EOPNOTSUPP; | |
5184 | } | |
5185 | ||
5186 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5187 | { | |
5188 | return -EOPNOTSUPP; | |
5189 | } | |
5190 | ||
889fca73 | 5191 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5192 | { |
5193 | return -EOPNOTSUPP; | |
5194 | } | |
ce593a6c | 5195 | |
469956e8 Y |
5196 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5197 | { | |
5198 | return -EOPNOTSUPP; | |
5199 | } | |
5200 | ||
889fca73 | 5201 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 | 5202 | { |
f8e85cf2 | 5203 | return -EOPNOTSUPP; |
ce593a6c | 5204 | } |
469956e8 | 5205 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5206 | |
d7718a9d JA |
5207 | struct io_poll_table { |
5208 | struct poll_table_struct pt; | |
5209 | struct io_kiocb *req; | |
5210 | int error; | |
5211 | }; | |
ce593a6c | 5212 | |
d7718a9d JA |
5213 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5214 | __poll_t mask, task_work_func_t func) | |
5215 | { | |
aa96bf8a | 5216 | int ret; |
d7718a9d JA |
5217 | |
5218 | /* for instances that support it check for an event match first: */ | |
5219 | if (mask && !(mask & poll->events)) | |
5220 | return 0; | |
5221 | ||
5222 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5223 | ||
5224 | list_del_init(&poll->wait.entry); | |
5225 | ||
d7718a9d | 5226 | req->result = mask; |
7cbf1722 | 5227 | req->task_work.func = func; |
6d816e08 JA |
5228 | percpu_ref_get(&req->ctx->refs); |
5229 | ||
d7718a9d | 5230 | /* |
e3aabf95 JA |
5231 | * If this fails, then the task is exiting. When a task exits, the |
5232 | * work gets canceled, so just cancel this request as well instead | |
5233 | * of executing it. We can't safely execute it anyway, as we may not | |
5234 | * have the needed state needed for it anyway. | |
d7718a9d | 5235 | */ |
355fb9e2 | 5236 | ret = io_req_task_work_add(req); |
aa96bf8a | 5237 | if (unlikely(ret)) { |
e3aabf95 | 5238 | WRITE_ONCE(poll->canceled, true); |
eab30c4d | 5239 | io_req_task_work_add_fallback(req, func); |
aa96bf8a | 5240 | } |
d7718a9d JA |
5241 | return 1; |
5242 | } | |
5243 | ||
74ce6ce4 JA |
5244 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5245 | __acquires(&req->ctx->completion_lock) | |
5246 | { | |
5247 | struct io_ring_ctx *ctx = req->ctx; | |
5248 | ||
5249 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5250 | struct poll_table_struct pt = { ._key = poll->events }; | |
5251 | ||
5252 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5253 | } | |
5254 | ||
5255 | spin_lock_irq(&ctx->completion_lock); | |
5256 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5257 | add_wait_queue(poll->head, &poll->wait); | |
5258 | return true; | |
5259 | } | |
5260 | ||
5261 | return false; | |
5262 | } | |
5263 | ||
d4e7cd36 | 5264 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5265 | { |
e8c2bc1f | 5266 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5267 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5268 | return req->async_data; |
d4e7cd36 JA |
5269 | return req->apoll->double_poll; |
5270 | } | |
5271 | ||
5272 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5273 | { | |
5274 | if (req->opcode == IORING_OP_POLL_ADD) | |
5275 | return &req->poll; | |
5276 | return &req->apoll->poll; | |
5277 | } | |
5278 | ||
5279 | static void io_poll_remove_double(struct io_kiocb *req) | |
5280 | { | |
5281 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5282 | |
5283 | lockdep_assert_held(&req->ctx->completion_lock); | |
5284 | ||
5285 | if (poll && poll->head) { | |
5286 | struct wait_queue_head *head = poll->head; | |
5287 | ||
5288 | spin_lock(&head->lock); | |
5289 | list_del_init(&poll->wait.entry); | |
5290 | if (poll->wait.private) | |
5291 | refcount_dec(&req->refs); | |
5292 | poll->head = NULL; | |
5293 | spin_unlock(&head->lock); | |
5294 | } | |
5295 | } | |
5296 | ||
5297 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5298 | { | |
5299 | struct io_ring_ctx *ctx = req->ctx; | |
5300 | ||
d4e7cd36 | 5301 | io_poll_remove_double(req); |
18bceab1 JA |
5302 | req->poll.done = true; |
5303 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5304 | io_commit_cqring(ctx); | |
5305 | } | |
5306 | ||
dd221f46 | 5307 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5308 | { |
dd221f46 | 5309 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5310 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5311 | struct io_kiocb *nxt; |
18bceab1 JA |
5312 | |
5313 | if (io_poll_rewait(req, &req->poll)) { | |
5314 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5315 | } else { |
5316 | hash_del(&req->hash_node); | |
5317 | io_poll_complete(req, req->result, 0); | |
5318 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5319 | |
dd221f46 PB |
5320 | nxt = io_put_req_find_next(req); |
5321 | io_cqring_ev_posted(ctx); | |
5322 | if (nxt) | |
5323 | __io_req_task_submit(nxt); | |
5324 | } | |
18bceab1 | 5325 | |
6d816e08 | 5326 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5327 | } |
5328 | ||
5329 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5330 | int sync, void *key) | |
5331 | { | |
5332 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5333 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5334 | __poll_t mask = key_to_poll(key); |
5335 | ||
5336 | /* for instances that support it check for an event match first: */ | |
5337 | if (mask && !(mask & poll->events)) | |
5338 | return 0; | |
5339 | ||
8706e04e JA |
5340 | list_del_init(&wait->entry); |
5341 | ||
807abcb0 | 5342 | if (poll && poll->head) { |
18bceab1 JA |
5343 | bool done; |
5344 | ||
807abcb0 JA |
5345 | spin_lock(&poll->head->lock); |
5346 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5347 | if (!done) |
807abcb0 | 5348 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5349 | /* make sure double remove sees this as being gone */ |
5350 | wait->private = NULL; | |
807abcb0 | 5351 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5352 | if (!done) { |
5353 | /* use wait func handler, so it matches the rq type */ | |
5354 | poll->wait.func(&poll->wait, mode, sync, key); | |
5355 | } | |
18bceab1 JA |
5356 | } |
5357 | refcount_dec(&req->refs); | |
5358 | return 1; | |
5359 | } | |
5360 | ||
5361 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5362 | wait_queue_func_t wake_func) | |
5363 | { | |
5364 | poll->head = NULL; | |
5365 | poll->done = false; | |
5366 | poll->canceled = false; | |
5367 | poll->events = events; | |
5368 | INIT_LIST_HEAD(&poll->wait.entry); | |
5369 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5370 | } | |
5371 | ||
5372 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5373 | struct wait_queue_head *head, |
5374 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5375 | { |
5376 | struct io_kiocb *req = pt->req; | |
5377 | ||
5378 | /* | |
5379 | * If poll->head is already set, it's because the file being polled | |
5380 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5381 | * for write). Setup a separate io_poll_iocb if this happens. | |
5382 | */ | |
5383 | if (unlikely(poll->head)) { | |
58852d4d PB |
5384 | struct io_poll_iocb *poll_one = poll; |
5385 | ||
18bceab1 | 5386 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5387 | if (*poll_ptr) { |
18bceab1 JA |
5388 | pt->error = -EINVAL; |
5389 | return; | |
5390 | } | |
5391 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5392 | if (!poll) { | |
5393 | pt->error = -ENOMEM; | |
5394 | return; | |
5395 | } | |
58852d4d | 5396 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5397 | refcount_inc(&req->refs); |
5398 | poll->wait.private = req; | |
807abcb0 | 5399 | *poll_ptr = poll; |
18bceab1 JA |
5400 | } |
5401 | ||
5402 | pt->error = 0; | |
5403 | poll->head = head; | |
a31eb4a2 JX |
5404 | |
5405 | if (poll->events & EPOLLEXCLUSIVE) | |
5406 | add_wait_queue_exclusive(head, &poll->wait); | |
5407 | else | |
5408 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5409 | } |
5410 | ||
5411 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5412 | struct poll_table_struct *p) | |
5413 | { | |
5414 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5415 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5416 | |
807abcb0 | 5417 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5418 | } |
5419 | ||
d7718a9d JA |
5420 | static void io_async_task_func(struct callback_head *cb) |
5421 | { | |
5422 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5423 | struct async_poll *apoll = req->apoll; | |
5424 | struct io_ring_ctx *ctx = req->ctx; | |
5425 | ||
5426 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5427 | ||
74ce6ce4 | 5428 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5429 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5430 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5431 | return; |
d7718a9d JA |
5432 | } |
5433 | ||
31067255 | 5434 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5435 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5436 | hash_del(&req->hash_node); |
2bae047e | 5437 | |
d4e7cd36 | 5438 | io_poll_remove_double(req); |
74ce6ce4 JA |
5439 | spin_unlock_irq(&ctx->completion_lock); |
5440 | ||
0be0b0e3 PB |
5441 | if (!READ_ONCE(apoll->poll.canceled)) |
5442 | __io_req_task_submit(req); | |
5443 | else | |
5444 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5445 | |
6d816e08 | 5446 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5447 | kfree(apoll->double_poll); |
31067255 | 5448 | kfree(apoll); |
d7718a9d JA |
5449 | } |
5450 | ||
5451 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5452 | void *key) | |
5453 | { | |
5454 | struct io_kiocb *req = wait->private; | |
5455 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5456 | ||
5457 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5458 | key_to_poll(key)); | |
5459 | ||
5460 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5461 | } | |
5462 | ||
5463 | static void io_poll_req_insert(struct io_kiocb *req) | |
5464 | { | |
5465 | struct io_ring_ctx *ctx = req->ctx; | |
5466 | struct hlist_head *list; | |
5467 | ||
5468 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5469 | hlist_add_head(&req->hash_node, list); | |
5470 | } | |
5471 | ||
5472 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5473 | struct io_poll_iocb *poll, | |
5474 | struct io_poll_table *ipt, __poll_t mask, | |
5475 | wait_queue_func_t wake_func) | |
5476 | __acquires(&ctx->completion_lock) | |
5477 | { | |
5478 | struct io_ring_ctx *ctx = req->ctx; | |
5479 | bool cancel = false; | |
5480 | ||
4d52f338 | 5481 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5482 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5483 | poll->file = req->file; |
18bceab1 | 5484 | poll->wait.private = req; |
d7718a9d JA |
5485 | |
5486 | ipt->pt._key = mask; | |
5487 | ipt->req = req; | |
5488 | ipt->error = -EINVAL; | |
5489 | ||
d7718a9d JA |
5490 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5491 | ||
5492 | spin_lock_irq(&ctx->completion_lock); | |
5493 | if (likely(poll->head)) { | |
5494 | spin_lock(&poll->head->lock); | |
5495 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5496 | if (ipt->error) | |
5497 | cancel = true; | |
5498 | ipt->error = 0; | |
5499 | mask = 0; | |
5500 | } | |
5501 | if (mask || ipt->error) | |
5502 | list_del_init(&poll->wait.entry); | |
5503 | else if (cancel) | |
5504 | WRITE_ONCE(poll->canceled, true); | |
5505 | else if (!poll->done) /* actually waiting for an event */ | |
5506 | io_poll_req_insert(req); | |
5507 | spin_unlock(&poll->head->lock); | |
5508 | } | |
5509 | ||
5510 | return mask; | |
5511 | } | |
5512 | ||
5513 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5514 | { | |
5515 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5516 | struct io_ring_ctx *ctx = req->ctx; | |
5517 | struct async_poll *apoll; | |
5518 | struct io_poll_table ipt; | |
5519 | __poll_t mask, ret; | |
9dab14b8 | 5520 | int rw; |
d7718a9d JA |
5521 | |
5522 | if (!req->file || !file_can_poll(req->file)) | |
5523 | return false; | |
24c74678 | 5524 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5525 | return false; |
9dab14b8 JA |
5526 | if (def->pollin) |
5527 | rw = READ; | |
5528 | else if (def->pollout) | |
5529 | rw = WRITE; | |
5530 | else | |
5531 | return false; | |
5532 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5533 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5534 | return false; |
5535 | ||
5536 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5537 | if (unlikely(!apoll)) | |
5538 | return false; | |
807abcb0 | 5539 | apoll->double_poll = NULL; |
d7718a9d JA |
5540 | |
5541 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5542 | req->apoll = apoll; |
d7718a9d | 5543 | |
8755d97a | 5544 | mask = 0; |
d7718a9d | 5545 | if (def->pollin) |
8755d97a | 5546 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5547 | if (def->pollout) |
5548 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5549 | |
5550 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5551 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5552 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5553 | mask &= ~POLLIN; | |
5554 | ||
d7718a9d JA |
5555 | mask |= POLLERR | POLLPRI; |
5556 | ||
5557 | ipt.pt._qproc = io_async_queue_proc; | |
5558 | ||
5559 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5560 | io_async_wake); | |
a36da65c | 5561 | if (ret || ipt.error) { |
d4e7cd36 | 5562 | io_poll_remove_double(req); |
d7718a9d | 5563 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5564 | kfree(apoll->double_poll); |
d7718a9d JA |
5565 | kfree(apoll); |
5566 | return false; | |
5567 | } | |
5568 | spin_unlock_irq(&ctx->completion_lock); | |
5569 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5570 | apoll->poll.events); | |
5571 | return true; | |
5572 | } | |
5573 | ||
5574 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5575 | struct io_poll_iocb *poll) | |
221c5eb2 | 5576 | { |
b41e9852 | 5577 | bool do_complete = false; |
221c5eb2 JA |
5578 | |
5579 | spin_lock(&poll->head->lock); | |
5580 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5581 | if (!list_empty(&poll->wait.entry)) { |
5582 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5583 | do_complete = true; |
221c5eb2 JA |
5584 | } |
5585 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5586 | hash_del(&req->hash_node); |
d7718a9d JA |
5587 | return do_complete; |
5588 | } | |
5589 | ||
5590 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5591 | { | |
5592 | bool do_complete; | |
5593 | ||
d4e7cd36 JA |
5594 | io_poll_remove_double(req); |
5595 | ||
d7718a9d JA |
5596 | if (req->opcode == IORING_OP_POLL_ADD) { |
5597 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5598 | } else { | |
3bfa5bcb JA |
5599 | struct async_poll *apoll = req->apoll; |
5600 | ||
d7718a9d | 5601 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5602 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5603 | if (do_complete) { | |
d7718a9d | 5604 | io_put_req(req); |
807abcb0 | 5605 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5606 | kfree(apoll); |
5607 | } | |
b1f573bd XW |
5608 | } |
5609 | ||
b41e9852 JA |
5610 | if (do_complete) { |
5611 | io_cqring_fill_event(req, -ECANCELED); | |
5612 | io_commit_cqring(req->ctx); | |
f254ac04 | 5613 | req_set_fail_links(req); |
216578e5 | 5614 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5615 | } |
5616 | ||
5617 | return do_complete; | |
221c5eb2 JA |
5618 | } |
5619 | ||
76e1b642 JA |
5620 | /* |
5621 | * Returns true if we found and killed one or more poll requests | |
5622 | */ | |
6b81928d PB |
5623 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5624 | struct files_struct *files) | |
221c5eb2 | 5625 | { |
78076bb6 | 5626 | struct hlist_node *tmp; |
221c5eb2 | 5627 | struct io_kiocb *req; |
8e2e1faf | 5628 | int posted = 0, i; |
221c5eb2 JA |
5629 | |
5630 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5631 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5632 | struct hlist_head *list; | |
5633 | ||
5634 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5635 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5636 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5637 | posted += io_poll_remove_one(req); |
5638 | } | |
221c5eb2 JA |
5639 | } |
5640 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5641 | |
8e2e1faf JA |
5642 | if (posted) |
5643 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5644 | |
5645 | return posted != 0; | |
221c5eb2 JA |
5646 | } |
5647 | ||
47f46768 JA |
5648 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5649 | { | |
78076bb6 | 5650 | struct hlist_head *list; |
47f46768 JA |
5651 | struct io_kiocb *req; |
5652 | ||
78076bb6 JA |
5653 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5654 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5655 | if (sqe_addr != req->user_data) |
5656 | continue; | |
5657 | if (io_poll_remove_one(req)) | |
eac406c6 | 5658 | return 0; |
b41e9852 | 5659 | return -EALREADY; |
47f46768 JA |
5660 | } |
5661 | ||
5662 | return -ENOENT; | |
5663 | } | |
5664 | ||
3529d8c2 JA |
5665 | static int io_poll_remove_prep(struct io_kiocb *req, |
5666 | const struct io_uring_sqe *sqe) | |
0969e783 | 5667 | { |
0969e783 JA |
5668 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5669 | return -EINVAL; | |
5670 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5671 | sqe->poll_events) | |
5672 | return -EINVAL; | |
5673 | ||
018043be | 5674 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5675 | return 0; |
5676 | } | |
5677 | ||
221c5eb2 JA |
5678 | /* |
5679 | * Find a running poll command that matches one specified in sqe->addr, | |
5680 | * and remove it if found. | |
5681 | */ | |
61e98203 | 5682 | static int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) |
221c5eb2 JA |
5683 | { |
5684 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5685 | int ret; |
221c5eb2 | 5686 | |
221c5eb2 | 5687 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5688 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5689 | spin_unlock_irq(&ctx->completion_lock); |
5690 | ||
4e88d6e7 JA |
5691 | if (ret < 0) |
5692 | req_set_fail_links(req); | |
e1e16097 | 5693 | io_req_complete(req, ret); |
221c5eb2 JA |
5694 | return 0; |
5695 | } | |
5696 | ||
221c5eb2 JA |
5697 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5698 | void *key) | |
5699 | { | |
c2f2eb7d JA |
5700 | struct io_kiocb *req = wait->private; |
5701 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5702 | |
d7718a9d | 5703 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5704 | } |
5705 | ||
221c5eb2 JA |
5706 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5707 | struct poll_table_struct *p) | |
5708 | { | |
5709 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5710 | ||
e8c2bc1f | 5711 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5712 | } |
5713 | ||
3529d8c2 | 5714 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5715 | { |
5716 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5717 | u32 events; |
221c5eb2 JA |
5718 | |
5719 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5720 | return -EINVAL; | |
5721 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5722 | return -EINVAL; | |
5723 | ||
5769a351 JX |
5724 | events = READ_ONCE(sqe->poll32_events); |
5725 | #ifdef __BIG_ENDIAN | |
5726 | events = swahw32(events); | |
5727 | #endif | |
a31eb4a2 JX |
5728 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5729 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5730 | return 0; |
5731 | } | |
5732 | ||
61e98203 | 5733 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5734 | { |
5735 | struct io_poll_iocb *poll = &req->poll; | |
5736 | struct io_ring_ctx *ctx = req->ctx; | |
5737 | struct io_poll_table ipt; | |
0969e783 | 5738 | __poll_t mask; |
0969e783 | 5739 | |
d7718a9d | 5740 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5741 | |
d7718a9d JA |
5742 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5743 | io_poll_wake); | |
221c5eb2 | 5744 | |
8c838788 | 5745 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5746 | ipt.error = 0; |
b0dd8a41 | 5747 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5748 | } |
221c5eb2 JA |
5749 | spin_unlock_irq(&ctx->completion_lock); |
5750 | ||
8c838788 JA |
5751 | if (mask) { |
5752 | io_cqring_ev_posted(ctx); | |
014db007 | 5753 | io_put_req(req); |
221c5eb2 | 5754 | } |
8c838788 | 5755 | return ipt.error; |
221c5eb2 JA |
5756 | } |
5757 | ||
5262f567 JA |
5758 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5759 | { | |
ad8a48ac JA |
5760 | struct io_timeout_data *data = container_of(timer, |
5761 | struct io_timeout_data, timer); | |
5762 | struct io_kiocb *req = data->req; | |
5763 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5764 | unsigned long flags; |
5765 | ||
5262f567 | 5766 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5767 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5768 | atomic_set(&req->ctx->cq_timeouts, |
5769 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5770 | ||
78e19bbe | 5771 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5772 | io_commit_cqring(ctx); |
5773 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5774 | ||
5775 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5776 | req_set_fail_links(req); |
5262f567 JA |
5777 | io_put_req(req); |
5778 | return HRTIMER_NORESTART; | |
5779 | } | |
5780 | ||
fbd15848 PB |
5781 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5782 | __u64 user_data) | |
f254ac04 | 5783 | { |
fbd15848 | 5784 | struct io_timeout_data *io; |
47f46768 JA |
5785 | struct io_kiocb *req; |
5786 | int ret = -ENOENT; | |
f254ac04 | 5787 | |
135fcde8 | 5788 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5789 | if (user_data == req->user_data) { |
47f46768 JA |
5790 | ret = 0; |
5791 | break; | |
5792 | } | |
5793 | } | |
5794 | ||
5795 | if (ret == -ENOENT) | |
fbd15848 PB |
5796 | return ERR_PTR(ret); |
5797 | ||
5798 | io = req->async_data; | |
e8c2bc1f | 5799 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 | 5800 | if (ret == -1) |
fbd15848 | 5801 | return ERR_PTR(-EALREADY); |
a71976f3 | 5802 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5803 | return req; |
5804 | } | |
47f46768 | 5805 | |
fbd15848 PB |
5806 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5807 | { | |
5808 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5809 | ||
5810 | if (IS_ERR(req)) | |
5811 | return PTR_ERR(req); | |
f254ac04 JA |
5812 | |
5813 | req_set_fail_links(req); | |
f254ac04 | 5814 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5815 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5816 | return 0; |
5817 | } | |
5818 | ||
9c8e11b3 PB |
5819 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5820 | struct timespec64 *ts, enum hrtimer_mode mode) | |
47f46768 | 5821 | { |
9c8e11b3 PB |
5822 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5823 | struct io_timeout_data *data; | |
47f46768 | 5824 | |
9c8e11b3 PB |
5825 | if (IS_ERR(req)) |
5826 | return PTR_ERR(req); | |
47f46768 | 5827 | |
9c8e11b3 PB |
5828 | req->timeout.off = 0; /* noseq */ |
5829 | data = req->async_data; | |
5830 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5831 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5832 | data->timer.function = io_timeout_fn; | |
5833 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5834 | return 0; | |
47f46768 JA |
5835 | } |
5836 | ||
3529d8c2 JA |
5837 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5838 | const struct io_uring_sqe *sqe) | |
b29472ee | 5839 | { |
9c8e11b3 PB |
5840 | struct io_timeout_rem *tr = &req->timeout_rem; |
5841 | ||
b29472ee JA |
5842 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5843 | return -EINVAL; | |
61710e43 DA |
5844 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5845 | return -EINVAL; | |
9c8e11b3 | 5846 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5847 | return -EINVAL; |
5848 | ||
9c8e11b3 PB |
5849 | tr->addr = READ_ONCE(sqe->addr); |
5850 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5851 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5852 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5853 | return -EINVAL; | |
5854 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5855 | return -EFAULT; | |
5856 | } else if (tr->flags) { | |
5857 | /* timeout removal doesn't support flags */ | |
b29472ee | 5858 | return -EINVAL; |
9c8e11b3 | 5859 | } |
b29472ee | 5860 | |
b29472ee JA |
5861 | return 0; |
5862 | } | |
5863 | ||
8662daec PB |
5864 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5865 | { | |
5866 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5867 | : HRTIMER_MODE_REL; | |
5868 | } | |
5869 | ||
11365043 JA |
5870 | /* |
5871 | * Remove or update an existing timeout command | |
5872 | */ | |
61e98203 | 5873 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5874 | { |
9c8e11b3 | 5875 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5876 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5877 | int ret; |
11365043 | 5878 | |
11365043 | 5879 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5880 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5881 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5882 | else |
5883 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5884 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5885 | |
47f46768 | 5886 | io_cqring_fill_event(req, ret); |
11365043 JA |
5887 | io_commit_cqring(ctx); |
5888 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5889 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5890 | if (ret < 0) |
5891 | req_set_fail_links(req); | |
ec9c02ad | 5892 | io_put_req(req); |
11365043 | 5893 | return 0; |
5262f567 JA |
5894 | } |
5895 | ||
3529d8c2 | 5896 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5897 | bool is_timeout_link) |
5262f567 | 5898 | { |
ad8a48ac | 5899 | struct io_timeout_data *data; |
a41525ab | 5900 | unsigned flags; |
56080b02 | 5901 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5902 | |
ad8a48ac | 5903 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5904 | return -EINVAL; |
ad8a48ac | 5905 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5906 | return -EINVAL; |
56080b02 | 5907 | if (off && is_timeout_link) |
2d28390a | 5908 | return -EINVAL; |
a41525ab JA |
5909 | flags = READ_ONCE(sqe->timeout_flags); |
5910 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5911 | return -EINVAL; |
bdf20073 | 5912 | |
bfe68a22 | 5913 | req->timeout.off = off; |
26a61679 | 5914 | |
e8c2bc1f | 5915 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5916 | return -ENOMEM; |
5917 | ||
e8c2bc1f | 5918 | data = req->async_data; |
ad8a48ac | 5919 | data->req = req; |
ad8a48ac JA |
5920 | |
5921 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5922 | return -EFAULT; |
5923 | ||
8662daec | 5924 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac JA |
5925 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5926 | return 0; | |
5927 | } | |
5928 | ||
61e98203 | 5929 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5930 | { |
ad8a48ac | 5931 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5932 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5933 | struct list_head *entry; |
bfe68a22 | 5934 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5935 | |
733f5c95 | 5936 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5937 | |
5262f567 JA |
5938 | /* |
5939 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5940 | * timeout event to be satisfied. If it isn't set, then this is |
5941 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5942 | */ |
8eb7e2d0 | 5943 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5944 | entry = ctx->timeout_list.prev; |
5945 | goto add; | |
5946 | } | |
5262f567 | 5947 | |
bfe68a22 PB |
5948 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5949 | req->timeout.target_seq = tail + off; | |
5262f567 | 5950 | |
f010505b MDG |
5951 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5952 | * This is safe because ->completion_lock is held, and submissions | |
5953 | * and completions are never mixed in the same ->completion_lock section. | |
5954 | */ | |
5955 | ctx->cq_last_tm_flush = tail; | |
5956 | ||
5262f567 JA |
5957 | /* |
5958 | * Insertion sort, ensuring the first entry in the list is always | |
5959 | * the one we need first. | |
5960 | */ | |
5262f567 | 5961 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5962 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5963 | timeout.list); | |
5262f567 | 5964 | |
8eb7e2d0 | 5965 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5966 | continue; |
bfe68a22 PB |
5967 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5968 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5969 | break; |
5970 | } | |
93bd25bb | 5971 | add: |
135fcde8 | 5972 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5973 | data->timer.function = io_timeout_fn; |
5974 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5975 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5976 | return 0; |
5977 | } | |
5262f567 | 5978 | |
62755e35 JA |
5979 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5980 | { | |
5981 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5982 | ||
5983 | return req->user_data == (unsigned long) data; | |
5984 | } | |
5985 | ||
e977d6d3 | 5986 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5987 | { |
62755e35 | 5988 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5989 | int ret = 0; |
5990 | ||
4f26bda1 | 5991 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5992 | switch (cancel_ret) { |
5993 | case IO_WQ_CANCEL_OK: | |
5994 | ret = 0; | |
5995 | break; | |
5996 | case IO_WQ_CANCEL_RUNNING: | |
5997 | ret = -EALREADY; | |
5998 | break; | |
5999 | case IO_WQ_CANCEL_NOTFOUND: | |
6000 | ret = -ENOENT; | |
6001 | break; | |
6002 | } | |
6003 | ||
e977d6d3 JA |
6004 | return ret; |
6005 | } | |
6006 | ||
47f46768 JA |
6007 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
6008 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 6009 | int success_ret) |
47f46768 JA |
6010 | { |
6011 | unsigned long flags; | |
6012 | int ret; | |
6013 | ||
6014 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
6015 | if (ret != -ENOENT) { | |
6016 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6017 | goto done; | |
6018 | } | |
6019 | ||
6020 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6021 | ret = io_timeout_cancel(ctx, sqe_addr); | |
6022 | if (ret != -ENOENT) | |
6023 | goto done; | |
6024 | ret = io_poll_cancel(ctx, sqe_addr); | |
6025 | done: | |
b0dd8a41 JA |
6026 | if (!ret) |
6027 | ret = success_ret; | |
47f46768 JA |
6028 | io_cqring_fill_event(req, ret); |
6029 | io_commit_cqring(ctx); | |
6030 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6031 | io_cqring_ev_posted(ctx); | |
6032 | ||
4e88d6e7 JA |
6033 | if (ret < 0) |
6034 | req_set_fail_links(req); | |
014db007 | 6035 | io_put_req(req); |
47f46768 JA |
6036 | } |
6037 | ||
3529d8c2 JA |
6038 | static int io_async_cancel_prep(struct io_kiocb *req, |
6039 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6040 | { |
fbf23849 | 6041 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6042 | return -EINVAL; |
61710e43 DA |
6043 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6044 | return -EINVAL; | |
6045 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
6046 | return -EINVAL; |
6047 | ||
fbf23849 JA |
6048 | req->cancel.addr = READ_ONCE(sqe->addr); |
6049 | return 0; | |
6050 | } | |
6051 | ||
61e98203 | 6052 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6053 | { |
6054 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 6055 | |
014db007 | 6056 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
6057 | return 0; |
6058 | } | |
6059 | ||
269bbe5f | 6060 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6061 | const struct io_uring_sqe *sqe) |
6062 | { | |
6ca56f84 JA |
6063 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
6064 | return -EINVAL; | |
61710e43 DA |
6065 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6066 | return -EINVAL; | |
6067 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
6068 | return -EINVAL; |
6069 | ||
269bbe5f BM |
6070 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6071 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6072 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6073 | return -EINVAL; |
269bbe5f | 6074 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6075 | return 0; |
6076 | } | |
6077 | ||
889fca73 | 6078 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6079 | { |
6080 | struct io_ring_ctx *ctx = req->ctx; | |
269bbe5f | 6081 | struct io_uring_rsrc_update up; |
05f3fb3c | 6082 | int ret; |
fbf23849 | 6083 | |
45d189c6 | 6084 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 6085 | return -EAGAIN; |
05f3fb3c | 6086 | |
269bbe5f BM |
6087 | up.offset = req->rsrc_update.offset; |
6088 | up.data = req->rsrc_update.arg; | |
05f3fb3c JA |
6089 | |
6090 | mutex_lock(&ctx->uring_lock); | |
269bbe5f | 6091 | ret = __io_sqe_files_update(ctx, &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
6092 | mutex_unlock(&ctx->uring_lock); |
6093 | ||
6094 | if (ret < 0) | |
6095 | req_set_fail_links(req); | |
889fca73 | 6096 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6097 | return 0; |
6098 | } | |
6099 | ||
bfe76559 | 6100 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6101 | { |
d625c6ee | 6102 | switch (req->opcode) { |
e781573e | 6103 | case IORING_OP_NOP: |
bfe76559 | 6104 | return 0; |
f67676d1 JA |
6105 | case IORING_OP_READV: |
6106 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6107 | case IORING_OP_READ: |
bfe76559 | 6108 | return io_read_prep(req, sqe); |
f67676d1 JA |
6109 | case IORING_OP_WRITEV: |
6110 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6111 | case IORING_OP_WRITE: |
bfe76559 | 6112 | return io_write_prep(req, sqe); |
0969e783 | 6113 | case IORING_OP_POLL_ADD: |
bfe76559 | 6114 | return io_poll_add_prep(req, sqe); |
0969e783 | 6115 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 6116 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 6117 | case IORING_OP_FSYNC: |
bfe76559 | 6118 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 6119 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 6120 | return io_prep_sfr(req, sqe); |
03b1230c | 6121 | case IORING_OP_SENDMSG: |
fddaface | 6122 | case IORING_OP_SEND: |
bfe76559 | 6123 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6124 | case IORING_OP_RECVMSG: |
fddaface | 6125 | case IORING_OP_RECV: |
bfe76559 | 6126 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6127 | case IORING_OP_CONNECT: |
bfe76559 | 6128 | return io_connect_prep(req, sqe); |
2d28390a | 6129 | case IORING_OP_TIMEOUT: |
bfe76559 | 6130 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6131 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6132 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6133 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6134 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6135 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6136 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6137 | case IORING_OP_ACCEPT: |
bfe76559 | 6138 | return io_accept_prep(req, sqe); |
d63d1b5e | 6139 | case IORING_OP_FALLOCATE: |
bfe76559 | 6140 | return io_fallocate_prep(req, sqe); |
15b71abe | 6141 | case IORING_OP_OPENAT: |
bfe76559 | 6142 | return io_openat_prep(req, sqe); |
b5dba59e | 6143 | case IORING_OP_CLOSE: |
bfe76559 | 6144 | return io_close_prep(req, sqe); |
05f3fb3c | 6145 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6146 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6147 | case IORING_OP_STATX: |
bfe76559 | 6148 | return io_statx_prep(req, sqe); |
4840e418 | 6149 | case IORING_OP_FADVISE: |
bfe76559 | 6150 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6151 | case IORING_OP_MADVISE: |
bfe76559 | 6152 | return io_madvise_prep(req, sqe); |
cebdb986 | 6153 | case IORING_OP_OPENAT2: |
bfe76559 | 6154 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6155 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6156 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6157 | case IORING_OP_SPLICE: |
bfe76559 | 6158 | return io_splice_prep(req, sqe); |
ddf0322d | 6159 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6160 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6161 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6162 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6163 | case IORING_OP_TEE: |
bfe76559 | 6164 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6165 | case IORING_OP_SHUTDOWN: |
6166 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6167 | case IORING_OP_RENAMEAT: |
6168 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6169 | case IORING_OP_UNLINKAT: |
6170 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
6171 | } |
6172 | ||
bfe76559 PB |
6173 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6174 | req->opcode); | |
6175 | return-EINVAL; | |
6176 | } | |
6177 | ||
6178 | static int io_req_defer_prep(struct io_kiocb *req, | |
6179 | const struct io_uring_sqe *sqe) | |
6180 | { | |
bfe76559 PB |
6181 | if (!sqe) |
6182 | return 0; | |
6183 | if (io_alloc_async_data(req)) | |
6184 | return -EAGAIN; | |
bfe76559 | 6185 | return io_req_prep(req, sqe); |
f67676d1 JA |
6186 | } |
6187 | ||
9cf7c104 PB |
6188 | static u32 io_get_sequence(struct io_kiocb *req) |
6189 | { | |
6190 | struct io_kiocb *pos; | |
6191 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 6192 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 6193 | |
f2f87370 PB |
6194 | io_for_each_link(pos, req) |
6195 | nr_reqs++; | |
9cf7c104 PB |
6196 | |
6197 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
6198 | return total_submitted - nr_reqs; | |
6199 | } | |
6200 | ||
3529d8c2 | 6201 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6202 | { |
a197f664 | 6203 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6204 | struct io_defer_entry *de; |
f67676d1 | 6205 | int ret; |
9cf7c104 | 6206 | u32 seq; |
de0617e4 | 6207 | |
9d858b21 | 6208 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6209 | if (likely(list_empty_careful(&ctx->defer_list) && |
6210 | !(req->flags & REQ_F_IO_DRAIN))) | |
6211 | return 0; | |
6212 | ||
6213 | seq = io_get_sequence(req); | |
6214 | /* Still a chance to pass the sequence check */ | |
6215 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6216 | return 0; |
6217 | ||
e8c2bc1f | 6218 | if (!req->async_data) { |
650b5481 | 6219 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6220 | if (ret) |
650b5481 PB |
6221 | return ret; |
6222 | } | |
cbdcb435 | 6223 | io_prep_async_link(req); |
27dc8338 PB |
6224 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6225 | if (!de) | |
6226 | return -ENOMEM; | |
2d28390a | 6227 | |
de0617e4 | 6228 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6229 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6230 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6231 | kfree(de); |
ae34817b PB |
6232 | io_queue_async_work(req); |
6233 | return -EIOCBQUEUED; | |
de0617e4 JA |
6234 | } |
6235 | ||
915967f6 | 6236 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6237 | de->req = req; |
9cf7c104 | 6238 | de->seq = seq; |
27dc8338 | 6239 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6240 | spin_unlock_irq(&ctx->completion_lock); |
6241 | return -EIOCBQUEUED; | |
6242 | } | |
6243 | ||
3ca405eb | 6244 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6245 | { |
0e1b6fe3 PB |
6246 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6247 | switch (req->opcode) { | |
6248 | case IORING_OP_READV: | |
6249 | case IORING_OP_READ_FIXED: | |
6250 | case IORING_OP_READ: | |
bcda7baa | 6251 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6252 | break; |
6253 | case IORING_OP_RECVMSG: | |
6254 | case IORING_OP_RECV: | |
bcda7baa | 6255 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6256 | break; |
6257 | } | |
6258 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6259 | } |
6260 | ||
0e1b6fe3 PB |
6261 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6262 | switch (req->opcode) { | |
6263 | case IORING_OP_READV: | |
6264 | case IORING_OP_READ_FIXED: | |
6265 | case IORING_OP_READ: | |
6266 | case IORING_OP_WRITEV: | |
6267 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6268 | case IORING_OP_WRITE: { |
6269 | struct io_async_rw *io = req->async_data; | |
6270 | if (io->free_iovec) | |
6271 | kfree(io->free_iovec); | |
0e1b6fe3 | 6272 | break; |
e8c2bc1f | 6273 | } |
0e1b6fe3 | 6274 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6275 | case IORING_OP_SENDMSG: { |
6276 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6277 | |
6278 | kfree(io->free_iov); | |
0e1b6fe3 | 6279 | break; |
e8c2bc1f | 6280 | } |
0e1b6fe3 PB |
6281 | case IORING_OP_SPLICE: |
6282 | case IORING_OP_TEE: | |
6283 | io_put_file(req, req->splice.file_in, | |
6284 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6285 | break; | |
f3cd4850 JA |
6286 | case IORING_OP_OPENAT: |
6287 | case IORING_OP_OPENAT2: | |
6288 | if (req->open.filename) | |
6289 | putname(req->open.filename); | |
6290 | break; | |
80a261fd JA |
6291 | case IORING_OP_RENAMEAT: |
6292 | putname(req->rename.oldpath); | |
6293 | putname(req->rename.newpath); | |
6294 | break; | |
14a1143b JA |
6295 | case IORING_OP_UNLINKAT: |
6296 | putname(req->unlink.filename); | |
6297 | break; | |
0e1b6fe3 PB |
6298 | } |
6299 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6300 | } |
99bc4c38 PB |
6301 | } |
6302 | ||
889fca73 | 6303 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6304 | { |
a197f664 | 6305 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6306 | int ret; |
2b188cc1 | 6307 | |
d625c6ee | 6308 | switch (req->opcode) { |
2b188cc1 | 6309 | case IORING_OP_NOP: |
889fca73 | 6310 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6311 | break; |
6312 | case IORING_OP_READV: | |
edafccee | 6313 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6314 | case IORING_OP_READ: |
889fca73 | 6315 | ret = io_read(req, issue_flags); |
edafccee | 6316 | break; |
3529d8c2 | 6317 | case IORING_OP_WRITEV: |
edafccee | 6318 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6319 | case IORING_OP_WRITE: |
889fca73 | 6320 | ret = io_write(req, issue_flags); |
2b188cc1 | 6321 | break; |
c992fe29 | 6322 | case IORING_OP_FSYNC: |
45d189c6 | 6323 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6324 | break; |
221c5eb2 | 6325 | case IORING_OP_POLL_ADD: |
61e98203 | 6326 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6327 | break; |
6328 | case IORING_OP_POLL_REMOVE: | |
61e98203 | 6329 | ret = io_poll_remove(req, issue_flags); |
221c5eb2 | 6330 | break; |
5d17b4a4 | 6331 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6332 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6333 | break; |
0fa03c62 | 6334 | case IORING_OP_SENDMSG: |
889fca73 | 6335 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6336 | break; |
fddaface | 6337 | case IORING_OP_SEND: |
889fca73 | 6338 | ret = io_send(req, issue_flags); |
0fa03c62 | 6339 | break; |
aa1fa28f | 6340 | case IORING_OP_RECVMSG: |
889fca73 | 6341 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6342 | break; |
fddaface | 6343 | case IORING_OP_RECV: |
889fca73 | 6344 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6345 | break; |
5262f567 | 6346 | case IORING_OP_TIMEOUT: |
61e98203 | 6347 | ret = io_timeout(req, issue_flags); |
5262f567 | 6348 | break; |
11365043 | 6349 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6350 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6351 | break; |
17f2fe35 | 6352 | case IORING_OP_ACCEPT: |
889fca73 | 6353 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6354 | break; |
f8e85cf2 | 6355 | case IORING_OP_CONNECT: |
889fca73 | 6356 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6357 | break; |
62755e35 | 6358 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6359 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6360 | break; |
d63d1b5e | 6361 | case IORING_OP_FALLOCATE: |
45d189c6 | 6362 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6363 | break; |
15b71abe | 6364 | case IORING_OP_OPENAT: |
45d189c6 | 6365 | ret = io_openat(req, issue_flags); |
15b71abe | 6366 | break; |
b5dba59e | 6367 | case IORING_OP_CLOSE: |
889fca73 | 6368 | ret = io_close(req, issue_flags); |
b5dba59e | 6369 | break; |
05f3fb3c | 6370 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6371 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6372 | break; |
eddc7ef5 | 6373 | case IORING_OP_STATX: |
45d189c6 | 6374 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6375 | break; |
4840e418 | 6376 | case IORING_OP_FADVISE: |
45d189c6 | 6377 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6378 | break; |
c1ca757b | 6379 | case IORING_OP_MADVISE: |
45d189c6 | 6380 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6381 | break; |
cebdb986 | 6382 | case IORING_OP_OPENAT2: |
45d189c6 | 6383 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6384 | break; |
3e4827b0 | 6385 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6386 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6387 | break; |
7d67af2c | 6388 | case IORING_OP_SPLICE: |
45d189c6 | 6389 | ret = io_splice(req, issue_flags); |
7d67af2c | 6390 | break; |
ddf0322d | 6391 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6392 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6393 | break; |
067524e9 | 6394 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6395 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6396 | break; |
f2a8d5c7 | 6397 | case IORING_OP_TEE: |
45d189c6 | 6398 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6399 | break; |
36f4fa68 | 6400 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6401 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6402 | break; |
80a261fd | 6403 | case IORING_OP_RENAMEAT: |
45d189c6 | 6404 | ret = io_renameat(req, issue_flags); |
80a261fd | 6405 | break; |
14a1143b | 6406 | case IORING_OP_UNLINKAT: |
45d189c6 | 6407 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6408 | break; |
2b188cc1 JA |
6409 | default: |
6410 | ret = -EINVAL; | |
6411 | break; | |
6412 | } | |
6413 | ||
def596e9 JA |
6414 | if (ret) |
6415 | return ret; | |
6416 | ||
b532576e JA |
6417 | /* If the op doesn't have a file, we're not polling for it */ |
6418 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6419 | const bool in_async = io_wq_current_is_worker(); |
6420 | ||
11ba820b JA |
6421 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6422 | if (in_async) | |
6423 | mutex_lock(&ctx->uring_lock); | |
6424 | ||
2e9dbe90 | 6425 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6426 | |
6427 | if (in_async) | |
6428 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6429 | } |
6430 | ||
6431 | return 0; | |
2b188cc1 JA |
6432 | } |
6433 | ||
5280f7e5 | 6434 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6435 | { |
6436 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6437 | struct io_kiocb *timeout; |
561fb04a | 6438 | int ret = 0; |
2b188cc1 | 6439 | |
6df1db6b PB |
6440 | timeout = io_prep_linked_timeout(req); |
6441 | if (timeout) | |
6442 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6443 | |
4014d943 | 6444 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6445 | ret = -ECANCELED; |
31b51510 | 6446 | |
561fb04a | 6447 | if (!ret) { |
561fb04a | 6448 | do { |
889fca73 | 6449 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6450 | /* |
6451 | * We can get EAGAIN for polled IO even though we're | |
6452 | * forcing a sync submission from here, since we can't | |
6453 | * wait for request slots on the block side. | |
6454 | */ | |
6455 | if (ret != -EAGAIN) | |
6456 | break; | |
6457 | cond_resched(); | |
6458 | } while (1); | |
6459 | } | |
31b51510 | 6460 | |
561fb04a | 6461 | if (ret) { |
c07e6719 XW |
6462 | struct io_ring_ctx *lock_ctx = NULL; |
6463 | ||
6464 | if (req->ctx->flags & IORING_SETUP_IOPOLL) | |
6465 | lock_ctx = req->ctx; | |
6466 | ||
dad1b124 | 6467 | /* |
c07e6719 XW |
6468 | * io_iopoll_complete() does not hold completion_lock to |
6469 | * complete polled io, so here for polled io, we can not call | |
6470 | * io_req_complete() directly, otherwise there maybe concurrent | |
6471 | * access to cqring, defer_list, etc, which is not safe. Given | |
6472 | * that io_iopoll_complete() is always called under uring_lock, | |
6473 | * so here for polled io, we also get uring_lock to complete | |
6474 | * it. | |
dad1b124 | 6475 | */ |
c07e6719 XW |
6476 | if (lock_ctx) |
6477 | mutex_lock(&lock_ctx->uring_lock); | |
dad1b124 | 6478 | |
c07e6719 XW |
6479 | req_set_fail_links(req); |
6480 | io_req_complete(req, ret); | |
6481 | ||
6482 | if (lock_ctx) | |
6483 | mutex_unlock(&lock_ctx->uring_lock); | |
edafccee | 6484 | } |
2b188cc1 JA |
6485 | } |
6486 | ||
65e19f54 JA |
6487 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6488 | int index) | |
6489 | { | |
269bbe5f | 6490 | struct fixed_rsrc_table *table; |
65e19f54 | 6491 | |
05f3fb3c | 6492 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6493 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6494 | } |
6495 | ||
8371adf5 PB |
6496 | static struct file *io_file_get(struct io_submit_state *state, |
6497 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6498 | { |
a197f664 | 6499 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6500 | struct file *file; |
09bb8394 | 6501 | |
8da11c19 | 6502 | if (fixed) { |
479f517b | 6503 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6504 | return NULL; |
b7620121 | 6505 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6506 | file = io_file_from_index(ctx, fd); |
36f72fe2 | 6507 | io_set_resource_node(req); |
09bb8394 | 6508 | } else { |
c826bd7a | 6509 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6510 | file = __io_file_get(state, fd); |
09bb8394 JA |
6511 | } |
6512 | ||
ce3d5aae PB |
6513 | if (file && unlikely(file->f_op == &io_uring_fops)) |
6514 | io_req_track_inflight(req); | |
8371adf5 | 6515 | return file; |
09bb8394 JA |
6516 | } |
6517 | ||
2665abfd | 6518 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6519 | { |
ad8a48ac JA |
6520 | struct io_timeout_data *data = container_of(timer, |
6521 | struct io_timeout_data, timer); | |
90cd7e42 | 6522 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6523 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6524 | unsigned long flags; |
2665abfd JA |
6525 | |
6526 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6527 | prev = req->timeout.head; |
6528 | req->timeout.head = NULL; | |
2665abfd JA |
6529 | |
6530 | /* | |
6531 | * We don't expect the list to be empty, that will only happen if we | |
6532 | * race with the completion of the linked work. | |
6533 | */ | |
90cd7e42 | 6534 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6535 | io_remove_next_linked(prev); |
90cd7e42 PB |
6536 | else |
6537 | prev = NULL; | |
2665abfd JA |
6538 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6539 | ||
6540 | if (prev) { | |
4e88d6e7 | 6541 | req_set_fail_links(prev); |
014db007 | 6542 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6543 | io_put_req_deferred(prev, 1); |
47f46768 | 6544 | } else { |
9ae1f8dd PB |
6545 | io_req_complete_post(req, -ETIME, 0); |
6546 | io_put_req_deferred(req, 1); | |
2665abfd | 6547 | } |
2665abfd JA |
6548 | return HRTIMER_NORESTART; |
6549 | } | |
6550 | ||
7271ef3a | 6551 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6552 | { |
76a46e06 | 6553 | /* |
f2f87370 PB |
6554 | * If the back reference is NULL, then our linked request finished |
6555 | * before we got a chance to setup the timer | |
76a46e06 | 6556 | */ |
90cd7e42 | 6557 | if (req->timeout.head) { |
e8c2bc1f | 6558 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6559 | |
ad8a48ac JA |
6560 | data->timer.function = io_link_timeout_fn; |
6561 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6562 | data->mode); | |
2665abfd | 6563 | } |
7271ef3a JA |
6564 | } |
6565 | ||
6566 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6567 | { | |
6568 | struct io_ring_ctx *ctx = req->ctx; | |
6569 | ||
6570 | spin_lock_irq(&ctx->completion_lock); | |
6571 | __io_queue_linked_timeout(req); | |
76a46e06 | 6572 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6573 | |
2665abfd | 6574 | /* drop submission reference */ |
76a46e06 JA |
6575 | io_put_req(req); |
6576 | } | |
2665abfd | 6577 | |
ad8a48ac | 6578 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6579 | { |
f2f87370 | 6580 | struct io_kiocb *nxt = req->link; |
2665abfd | 6581 | |
f2f87370 PB |
6582 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6583 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6584 | return NULL; |
2665abfd | 6585 | |
90cd7e42 | 6586 | nxt->timeout.head = req; |
900fad45 | 6587 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6588 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6589 | return nxt; |
2665abfd JA |
6590 | } |
6591 | ||
c5eef2b9 | 6592 | static void __io_queue_sqe(struct io_kiocb *req) |
2b188cc1 | 6593 | { |
4a0a7a18 | 6594 | struct io_kiocb *linked_timeout; |
193155c8 | 6595 | const struct cred *old_creds = NULL; |
c5eef2b9 | 6596 | int ret; |
2b188cc1 | 6597 | |
4a0a7a18 JA |
6598 | again: |
6599 | linked_timeout = io_prep_linked_timeout(req); | |
6600 | ||
2e5aa6cb PB |
6601 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6602 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6603 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6604 | if (old_creds) |
6605 | revert_creds(old_creds); | |
98447d65 | 6606 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6607 | old_creds = NULL; /* restored original creds */ |
6608 | else | |
98447d65 | 6609 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6610 | } |
6611 | ||
c5eef2b9 | 6612 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
491381ce JA |
6613 | |
6614 | /* | |
6615 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6616 | * doesn't support non-blocking read/write attempts | |
6617 | */ | |
24c74678 | 6618 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6619 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6620 | /* |
6621 | * Queued up for async execution, worker will release | |
6622 | * submit reference when the iocb is actually submitted. | |
6623 | */ | |
6624 | io_queue_async_work(req); | |
2b188cc1 | 6625 | } |
bbad27b2 | 6626 | |
f063c547 PB |
6627 | if (linked_timeout) |
6628 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6629 | } else if (likely(!ret)) { |
6630 | /* drop submission reference */ | |
e342c807 | 6631 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6632 | struct io_ring_ctx *ctx = req->ctx; |
6633 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
6634 | ||
6dd0be1e PB |
6635 | cs->reqs[cs->nr++] = req; |
6636 | if (cs->nr == IO_COMPL_BATCH) | |
c5eef2b9 | 6637 | io_submit_flush_completions(cs, ctx); |
9affd664 PB |
6638 | req = NULL; |
6639 | } else { | |
6640 | req = io_put_req_find_next(req); | |
6641 | } | |
6642 | ||
0d63c148 PB |
6643 | if (linked_timeout) |
6644 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6645 | |
0d63c148 PB |
6646 | if (req) { |
6647 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6648 | goto again; | |
6649 | io_queue_async_work(req); | |
6650 | } | |
6651 | } else { | |
652532ad PB |
6652 | /* un-prep timeout, so it'll be killed as any other linked */ |
6653 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6654 | req_set_fail_links(req); |
e65ef56d | 6655 | io_put_req(req); |
e1e16097 | 6656 | io_req_complete(req, ret); |
9e645e11 | 6657 | } |
652532ad | 6658 | |
193155c8 JA |
6659 | if (old_creds) |
6660 | revert_creds(old_creds); | |
2b188cc1 JA |
6661 | } |
6662 | ||
c5eef2b9 | 6663 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
6664 | { |
6665 | int ret; | |
6666 | ||
3529d8c2 | 6667 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6668 | if (ret) { |
6669 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6670 | fail_req: |
4e88d6e7 | 6671 | req_set_fail_links(req); |
e1e16097 JA |
6672 | io_put_req(req); |
6673 | io_req_complete(req, ret); | |
4fe2c963 | 6674 | } |
2550878f | 6675 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6676 | if (!req->async_data) { |
bd2ab18a | 6677 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6678 | if (unlikely(ret)) |
bd2ab18a PB |
6679 | goto fail_req; |
6680 | } | |
ce35a47a JA |
6681 | io_queue_async_work(req); |
6682 | } else { | |
c1379e24 PB |
6683 | if (sqe) { |
6684 | ret = io_req_prep(req, sqe); | |
6685 | if (unlikely(ret)) | |
6686 | goto fail_req; | |
6687 | } | |
c5eef2b9 | 6688 | __io_queue_sqe(req); |
ce35a47a | 6689 | } |
4fe2c963 JL |
6690 | } |
6691 | ||
c5eef2b9 | 6692 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 6693 | { |
94ae5e77 | 6694 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6695 | io_put_req(req); |
6696 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6697 | } else |
c5eef2b9 | 6698 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
6699 | } |
6700 | ||
863e0560 PB |
6701 | struct io_submit_link { |
6702 | struct io_kiocb *head; | |
6703 | struct io_kiocb *last; | |
6704 | }; | |
6705 | ||
1d4240cc | 6706 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
c5eef2b9 | 6707 | struct io_submit_link *link) |
9e645e11 | 6708 | { |
a197f664 | 6709 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6710 | int ret; |
9e645e11 | 6711 | |
9e645e11 JA |
6712 | /* |
6713 | * If we already have a head request, queue this one for async | |
6714 | * submittal once the head completes. If we don't have a head but | |
6715 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6716 | * submitted sync once the chain is complete. If none of those | |
6717 | * conditions are true (normal request), then just queue it. | |
6718 | */ | |
863e0560 PB |
6719 | if (link->head) { |
6720 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6721 | |
8cdf2193 PB |
6722 | /* |
6723 | * Taking sequential execution of a link, draining both sides | |
6724 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6725 | * requests in the link. So, it drains the head and the | |
6726 | * next after the link request. The last one is done via | |
6727 | * drain_next flag to persist the effect across calls. | |
6728 | */ | |
ef4ff581 | 6729 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6730 | head->flags |= REQ_F_IO_DRAIN; |
6731 | ctx->drain_next = 1; | |
6732 | } | |
3529d8c2 | 6733 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6734 | if (unlikely(ret)) { |
4e88d6e7 | 6735 | /* fail even hard links since we don't submit */ |
9d76377f | 6736 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6737 | return ret; |
2d28390a | 6738 | } |
9d76377f | 6739 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6740 | link->last->link = req; |
863e0560 | 6741 | link->last = req; |
32fe525b PB |
6742 | |
6743 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6744 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
c5eef2b9 | 6745 | io_queue_link_head(head); |
863e0560 | 6746 | link->head = NULL; |
32fe525b | 6747 | } |
9e645e11 | 6748 | } else { |
711be031 PB |
6749 | if (unlikely(ctx->drain_next)) { |
6750 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6751 | ctx->drain_next = 0; |
711be031 | 6752 | } |
ef4ff581 | 6753 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6754 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6755 | if (unlikely(ret)) |
711be031 | 6756 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6757 | link->head = req; |
6758 | link->last = req; | |
711be031 | 6759 | } else { |
c5eef2b9 | 6760 | io_queue_sqe(req, sqe); |
711be031 | 6761 | } |
9e645e11 | 6762 | } |
2e6e1fde | 6763 | |
1d4240cc | 6764 | return 0; |
9e645e11 JA |
6765 | } |
6766 | ||
9a56a232 JA |
6767 | /* |
6768 | * Batched submission is done, ensure local IO is flushed out. | |
6769 | */ | |
ba88ff11 PB |
6770 | static void io_submit_state_end(struct io_submit_state *state, |
6771 | struct io_ring_ctx *ctx) | |
9a56a232 | 6772 | { |
6dd0be1e | 6773 | if (state->comp.nr) |
ba88ff11 | 6774 | io_submit_flush_completions(&state->comp, ctx); |
27926b68 JA |
6775 | if (state->plug_started) |
6776 | blk_finish_plug(&state->plug); | |
9f13c35b | 6777 | io_state_file_put(state); |
9a56a232 JA |
6778 | } |
6779 | ||
6780 | /* | |
6781 | * Start submission side cache. | |
6782 | */ | |
6783 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6784 | unsigned int max_ios) |
9a56a232 | 6785 | { |
27926b68 | 6786 | state->plug_started = false; |
9a56a232 JA |
6787 | state->ios_left = max_ios; |
6788 | } | |
6789 | ||
2b188cc1 JA |
6790 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6791 | { | |
75b28aff | 6792 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6793 | |
caf582c6 PB |
6794 | /* |
6795 | * Ensure any loads from the SQEs are done at this point, | |
6796 | * since once we write the new head, the application could | |
6797 | * write new data to them. | |
6798 | */ | |
6799 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6800 | } |
6801 | ||
2b188cc1 | 6802 | /* |
3529d8c2 | 6803 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6804 | * that is mapped by userspace. This means that care needs to be taken to |
6805 | * ensure that reads are stable, as we cannot rely on userspace always | |
6806 | * being a good citizen. If members of the sqe are validated and then later | |
6807 | * used, it's important that those reads are done through READ_ONCE() to | |
6808 | * prevent a re-load down the line. | |
6809 | */ | |
709b302f | 6810 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6811 | { |
75b28aff | 6812 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6813 | unsigned head; |
6814 | ||
6815 | /* | |
6816 | * The cached sq head (or cq tail) serves two purposes: | |
6817 | * | |
6818 | * 1) allows us to batch the cost of updating the user visible | |
6819 | * head updates. | |
6820 | * 2) allows the kernel side to track the head on its own, even | |
6821 | * though the application is the one updating it. | |
6822 | */ | |
ee7d46d9 | 6823 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6824 | if (likely(head < ctx->sq_entries)) |
6825 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6826 | |
6827 | /* drop invalid entries */ | |
498ccd9e | 6828 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6829 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6830 | return NULL; |
6831 | } | |
6832 | ||
6833 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6834 | { | |
6835 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6836 | } |
6837 | ||
21b55dbc SG |
6838 | /* |
6839 | * Check SQE restrictions (opcode and flags). | |
6840 | * | |
6841 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6842 | */ | |
6843 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6844 | struct io_kiocb *req, | |
6845 | unsigned int sqe_flags) | |
6846 | { | |
6847 | if (!ctx->restricted) | |
6848 | return true; | |
6849 | ||
6850 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6851 | return false; | |
6852 | ||
6853 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6854 | ctx->restrictions.sqe_flags_required) | |
6855 | return false; | |
6856 | ||
6857 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6858 | ctx->restrictions.sqe_flags_required)) | |
6859 | return false; | |
6860 | ||
6861 | return true; | |
6862 | } | |
6863 | ||
ef4ff581 PB |
6864 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6865 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6866 | IOSQE_BUFFER_SELECT) | |
6867 | ||
6868 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
258b29a9 | 6869 | const struct io_uring_sqe *sqe) |
0553b8bd | 6870 | { |
258b29a9 | 6871 | struct io_submit_state *state; |
ef4ff581 | 6872 | unsigned int sqe_flags; |
71b547c0 | 6873 | int id, ret; |
ef4ff581 | 6874 | |
0553b8bd PB |
6875 | req->opcode = READ_ONCE(sqe->opcode); |
6876 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6877 | req->async_data = NULL; |
0553b8bd PB |
6878 | req->file = NULL; |
6879 | req->ctx = ctx; | |
6880 | req->flags = 0; | |
f2f87370 | 6881 | req->link = NULL; |
269bbe5f | 6882 | req->fixed_rsrc_refs = NULL; |
0553b8bd PB |
6883 | /* one is dropped after submission, the other at completion */ |
6884 | refcount_set(&req->refs, 2); | |
4dd2824d | 6885 | req->task = current; |
0553b8bd | 6886 | req->result = 0; |
ef4ff581 PB |
6887 | |
6888 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6889 | return -EINVAL; | |
6890 | ||
28cea78a | 6891 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6892 | return -EFAULT; |
ef4ff581 PB |
6893 | |
6894 | sqe_flags = READ_ONCE(sqe->flags); | |
6895 | /* enforce forwards compatibility on users */ | |
6896 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6897 | return -EINVAL; | |
6898 | ||
21b55dbc SG |
6899 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6900 | return -EACCES; | |
6901 | ||
ef4ff581 PB |
6902 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6903 | !io_op_defs[req->opcode].buffer_select) | |
6904 | return -EOPNOTSUPP; | |
6905 | ||
6906 | id = READ_ONCE(sqe->personality); | |
6907 | if (id) { | |
1e6fa521 JA |
6908 | struct io_identity *iod; |
6909 | ||
1e6fa521 JA |
6910 | iod = idr_find(&ctx->personality_idr, id); |
6911 | if (unlikely(!iod)) | |
ef4ff581 | 6912 | return -EINVAL; |
1e6fa521 | 6913 | refcount_inc(&iod->count); |
ec99ca6c PB |
6914 | |
6915 | __io_req_init_async(req); | |
1e6fa521 JA |
6916 | get_cred(iod->creds); |
6917 | req->work.identity = iod; | |
dfead8a8 | 6918 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6919 | } |
6920 | ||
6921 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6922 | req->flags |= sqe_flags; |
258b29a9 | 6923 | state = &ctx->submit_state; |
ef4ff581 | 6924 | |
27926b68 JA |
6925 | /* |
6926 | * Plug now if we have more than 1 IO left after this, and the target | |
6927 | * is potentially a read/write to block based storage. | |
6928 | */ | |
6929 | if (!state->plug_started && state->ios_left > 1 && | |
6930 | io_op_defs[req->opcode].plug) { | |
6931 | blk_start_plug(&state->plug); | |
6932 | state->plug_started = true; | |
6933 | } | |
6934 | ||
bd5bbda7 PB |
6935 | ret = 0; |
6936 | if (io_op_defs[req->opcode].needs_file) { | |
6937 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6938 | ||
6939 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
ba13e23f | 6940 | if (unlikely(!req->file)) |
bd5bbda7 PB |
6941 | ret = -EBADF; |
6942 | } | |
63ff8223 | 6943 | |
71b547c0 PB |
6944 | state->ios_left--; |
6945 | return ret; | |
0553b8bd PB |
6946 | } |
6947 | ||
0f212204 | 6948 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6949 | { |
863e0560 | 6950 | struct io_submit_link link; |
9e645e11 | 6951 | int i, submitted = 0; |
6c271ce2 | 6952 | |
c4a2ed72 | 6953 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 | 6954 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6c503150 | 6955 | if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6956 | return -EBUSY; |
6957 | } | |
6c271ce2 | 6958 | |
ee7d46d9 PB |
6959 | /* make sure SQ entry isn't read before tail */ |
6960 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6961 | |
2b85edfc PB |
6962 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6963 | return -EAGAIN; | |
6c271ce2 | 6964 | |
d8a6df10 | 6965 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6966 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6967 | |
ba88ff11 | 6968 | io_submit_state_start(&ctx->submit_state, nr); |
863e0560 | 6969 | link.head = NULL; |
b14cca0c | 6970 | |
6c271ce2 | 6971 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6972 | const struct io_uring_sqe *sqe; |
196be95c | 6973 | struct io_kiocb *req; |
1cb1edb2 | 6974 | int err; |
fb5ccc98 | 6975 | |
b1e50e54 PB |
6976 | sqe = io_get_sqe(ctx); |
6977 | if (unlikely(!sqe)) { | |
6978 | io_consume_sqe(ctx); | |
6979 | break; | |
6980 | } | |
258b29a9 | 6981 | req = io_alloc_req(ctx); |
196be95c PB |
6982 | if (unlikely(!req)) { |
6983 | if (!submitted) | |
6984 | submitted = -EAGAIN; | |
fb5ccc98 | 6985 | break; |
196be95c | 6986 | } |
709b302f | 6987 | io_consume_sqe(ctx); |
d3656344 JA |
6988 | /* will complete beyond this point, count as submitted */ |
6989 | submitted++; | |
6990 | ||
258b29a9 | 6991 | err = io_init_req(ctx, req, sqe); |
ef4ff581 | 6992 | if (unlikely(err)) { |
1cb1edb2 | 6993 | fail_req: |
e1e16097 JA |
6994 | io_put_req(req); |
6995 | io_req_complete(req, err); | |
196be95c PB |
6996 | break; |
6997 | } | |
fb5ccc98 | 6998 | |
354420f7 | 6999 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
2d7e9358 | 7000 | true, ctx->flags & IORING_SETUP_SQPOLL); |
c5eef2b9 | 7001 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
7002 | if (err) |
7003 | goto fail_req; | |
6c271ce2 JA |
7004 | } |
7005 | ||
9466f437 PB |
7006 | if (unlikely(submitted != nr)) { |
7007 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
7008 | struct io_uring_task *tctx = current->io_uring; |
7009 | int unused = nr - ref_used; | |
9466f437 | 7010 | |
d8a6df10 JA |
7011 | percpu_ref_put_many(&ctx->refs, unused); |
7012 | percpu_counter_sub(&tctx->inflight, unused); | |
7013 | put_task_struct_many(current, unused); | |
9466f437 | 7014 | } |
863e0560 | 7015 | if (link.head) |
c5eef2b9 | 7016 | io_queue_link_head(link.head); |
ba88ff11 | 7017 | io_submit_state_end(&ctx->submit_state, ctx); |
6c271ce2 | 7018 | |
ae9428ca PB |
7019 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7020 | io_commit_sqring(ctx); | |
7021 | ||
6c271ce2 JA |
7022 | return submitted; |
7023 | } | |
7024 | ||
23b3628e XW |
7025 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7026 | { | |
7027 | /* Tell userspace we may need a wakeup call */ | |
7028 | spin_lock_irq(&ctx->completion_lock); | |
7029 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
7030 | spin_unlock_irq(&ctx->completion_lock); | |
7031 | } | |
7032 | ||
7033 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7034 | { | |
7035 | spin_lock_irq(&ctx->completion_lock); | |
7036 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
7037 | spin_unlock_irq(&ctx->completion_lock); | |
7038 | } | |
7039 | ||
08369246 | 7040 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7041 | { |
c8d1ba58 | 7042 | unsigned int to_submit; |
bdcd3eab | 7043 | int ret = 0; |
6c271ce2 | 7044 | |
c8d1ba58 | 7045 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
7046 | /* if we're handling multiple rings, cap submit size for fairness */ |
7047 | if (cap_entries && to_submit > 8) | |
7048 | to_submit = 8; | |
7049 | ||
906a3c6f | 7050 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7051 | unsigned nr_events = 0; |
a4c0b3de | 7052 | |
c8d1ba58 | 7053 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7054 | if (!list_empty(&ctx->iopoll_list)) |
c8d1ba58 | 7055 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7056 | |
d9d05217 PB |
7057 | if (to_submit && !ctx->sqo_dead && |
7058 | likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 | 7059 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 JA |
7060 | mutex_unlock(&ctx->uring_lock); |
7061 | } | |
6c271ce2 | 7062 | |
90554200 JA |
7063 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7064 | wake_up(&ctx->sqo_sq_wait); | |
6c271ce2 | 7065 | |
08369246 XW |
7066 | return ret; |
7067 | } | |
6c271ce2 | 7068 | |
08369246 XW |
7069 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7070 | { | |
7071 | struct io_ring_ctx *ctx; | |
7072 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7073 | |
08369246 XW |
7074 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7075 | if (sq_thread_idle < ctx->sq_thread_idle) | |
7076 | sq_thread_idle = ctx->sq_thread_idle; | |
c8d1ba58 | 7077 | } |
c1edbf5f | 7078 | |
08369246 | 7079 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7080 | } |
6c271ce2 | 7081 | |
69fb2131 JA |
7082 | static void io_sqd_init_new(struct io_sq_data *sqd) |
7083 | { | |
7084 | struct io_ring_ctx *ctx; | |
7085 | ||
7086 | while (!list_empty(&sqd->ctx_new_list)) { | |
7087 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
7088 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
7089 | complete(&ctx->sq_thread_comp); | |
7090 | } | |
08369246 XW |
7091 | |
7092 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
7093 | } |
7094 | ||
c8d1ba58 JA |
7095 | static int io_sq_thread(void *data) |
7096 | { | |
91d8f519 | 7097 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
7098 | struct files_struct *old_files = current->files; |
7099 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
7100 | const struct cred *old_cred = NULL; |
7101 | struct io_sq_data *sqd = data; | |
7102 | struct io_ring_ctx *ctx; | |
a0d9205f | 7103 | unsigned long timeout = 0; |
08369246 | 7104 | DEFINE_WAIT(wait); |
6c271ce2 | 7105 | |
28cea78a JA |
7106 | task_lock(current); |
7107 | current->files = NULL; | |
7108 | current->nsproxy = NULL; | |
7109 | task_unlock(current); | |
6c271ce2 | 7110 | |
69fb2131 | 7111 | while (!kthread_should_stop()) { |
08369246 XW |
7112 | int ret; |
7113 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
7114 | |
7115 | /* | |
69fb2131 JA |
7116 | * Any changes to the sqd lists are synchronized through the |
7117 | * kthread parking. This synchronizes the thread vs users, | |
7118 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 7119 | */ |
65b2b213 | 7120 | if (kthread_should_park()) { |
69fb2131 | 7121 | kthread_parkme(); |
65b2b213 XW |
7122 | /* |
7123 | * When sq thread is unparked, in case the previous park operation | |
7124 | * comes from io_put_sq_data(), which means that sq thread is going | |
7125 | * to be stopped, so here needs to have a check. | |
7126 | */ | |
7127 | if (kthread_should_stop()) | |
7128 | break; | |
7129 | } | |
7143b5ac | 7130 | |
08369246 | 7131 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 7132 | io_sqd_init_new(sqd); |
08369246 XW |
7133 | timeout = jiffies + sqd->sq_thread_idle; |
7134 | } | |
6c271ce2 | 7135 | |
08369246 | 7136 | sqt_spin = false; |
e95eee2d | 7137 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
7138 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7139 | if (current->cred != ctx->creds) { | |
7140 | if (old_cred) | |
7141 | revert_creds(old_cred); | |
7142 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7143 | } |
91d8f519 | 7144 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7145 | #ifdef CONFIG_AUDIT |
7146 | current->loginuid = ctx->loginuid; | |
7147 | current->sessionid = ctx->sessionid; | |
7148 | #endif | |
bdcd3eab | 7149 | |
08369246 XW |
7150 | ret = __io_sq_thread(ctx, cap_entries); |
7151 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
7152 | sqt_spin = true; | |
6c271ce2 | 7153 | |
28cea78a | 7154 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7155 | } |
6c271ce2 | 7156 | |
08369246 | 7157 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7158 | io_run_task_work(); |
d434ab6d | 7159 | io_sq_thread_drop_mm_files(); |
c8d1ba58 | 7160 | cond_resched(); |
08369246 XW |
7161 | if (sqt_spin) |
7162 | timeout = jiffies + sqd->sq_thread_idle; | |
7163 | continue; | |
7164 | } | |
7165 | ||
08369246 XW |
7166 | needs_sched = true; |
7167 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
7168 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
7169 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
7170 | !list_empty_careful(&ctx->iopoll_list)) { | |
7171 | needs_sched = false; | |
7172 | break; | |
7173 | } | |
7174 | if (io_sqring_entries(ctx)) { | |
7175 | needs_sched = false; | |
7176 | break; | |
7177 | } | |
7178 | } | |
7179 | ||
8b28fdf2 | 7180 | if (needs_sched && !kthread_should_park()) { |
69fb2131 JA |
7181 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7182 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 7183 | |
69fb2131 | 7184 | schedule(); |
69fb2131 JA |
7185 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7186 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7187 | } |
08369246 XW |
7188 | |
7189 | finish_wait(&sqd->wait, &wait); | |
7190 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
7191 | } |
7192 | ||
4c6e277c | 7193 | io_run_task_work(); |
d434ab6d | 7194 | io_sq_thread_drop_mm_files(); |
b41e9852 | 7195 | |
91d8f519 DZ |
7196 | if (cur_css) |
7197 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7198 | if (old_cred) |
7199 | revert_creds(old_cred); | |
06058632 | 7200 | |
28cea78a JA |
7201 | task_lock(current); |
7202 | current->files = old_files; | |
7203 | current->nsproxy = old_nsproxy; | |
7204 | task_unlock(current); | |
7205 | ||
2bbcd6d3 | 7206 | kthread_parkme(); |
06058632 | 7207 | |
6c271ce2 JA |
7208 | return 0; |
7209 | } | |
7210 | ||
bda52162 JA |
7211 | struct io_wait_queue { |
7212 | struct wait_queue_entry wq; | |
7213 | struct io_ring_ctx *ctx; | |
7214 | unsigned to_wait; | |
7215 | unsigned nr_timeouts; | |
7216 | }; | |
7217 | ||
6c503150 | 7218 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7219 | { |
7220 | struct io_ring_ctx *ctx = iowq->ctx; | |
7221 | ||
7222 | /* | |
d195a66e | 7223 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7224 | * started waiting. For timeouts, we always want to return to userspace, |
7225 | * regardless of event count. | |
7226 | */ | |
6c503150 | 7227 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
7228 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7229 | } | |
7230 | ||
7231 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7232 | int wake_flags, void *key) | |
7233 | { | |
7234 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7235 | wq); | |
7236 | ||
6c503150 PB |
7237 | /* |
7238 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7239 | * the task, and the next invocation will do it. | |
7240 | */ | |
7241 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow)) | |
7242 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7243 | return -1; | |
bda52162 JA |
7244 | } |
7245 | ||
af9c1a44 JA |
7246 | static int io_run_task_work_sig(void) |
7247 | { | |
7248 | if (io_run_task_work()) | |
7249 | return 1; | |
7250 | if (!signal_pending(current)) | |
7251 | return 0; | |
792ee0f6 JA |
7252 | if (test_tsk_thread_flag(current, TIF_NOTIFY_SIGNAL)) |
7253 | return -ERESTARTSYS; | |
af9c1a44 JA |
7254 | return -EINTR; |
7255 | } | |
7256 | ||
eeb60b9a PB |
7257 | /* when returns >0, the caller should retry */ |
7258 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7259 | struct io_wait_queue *iowq, | |
7260 | signed long *timeout) | |
7261 | { | |
7262 | int ret; | |
7263 | ||
7264 | /* make sure we run task_work before checking for signals */ | |
7265 | ret = io_run_task_work_sig(); | |
7266 | if (ret || io_should_wake(iowq)) | |
7267 | return ret; | |
7268 | /* let the caller flush overflows, retry */ | |
7269 | if (test_bit(0, &ctx->cq_check_overflow)) | |
7270 | return 1; | |
7271 | ||
7272 | *timeout = schedule_timeout(*timeout); | |
7273 | return !*timeout ? -ETIME : 1; | |
7274 | } | |
7275 | ||
2b188cc1 JA |
7276 | /* |
7277 | * Wait until events become available, if we don't already have some. The | |
7278 | * application must reap them itself, as they reside on the shared cq ring. | |
7279 | */ | |
7280 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7281 | const sigset_t __user *sig, size_t sigsz, |
7282 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7283 | { |
bda52162 JA |
7284 | struct io_wait_queue iowq = { |
7285 | .wq = { | |
7286 | .private = current, | |
7287 | .func = io_wake_function, | |
7288 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7289 | }, | |
7290 | .ctx = ctx, | |
7291 | .to_wait = min_events, | |
7292 | }; | |
75b28aff | 7293 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7294 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7295 | int ret; | |
2b188cc1 | 7296 | |
b41e9852 | 7297 | do { |
6c503150 PB |
7298 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
7299 | if (io_cqring_events(ctx) >= min_events) | |
b41e9852 | 7300 | return 0; |
4c6e277c | 7301 | if (!io_run_task_work()) |
b41e9852 | 7302 | break; |
b41e9852 | 7303 | } while (1); |
2b188cc1 JA |
7304 | |
7305 | if (sig) { | |
9e75ad5d AB |
7306 | #ifdef CONFIG_COMPAT |
7307 | if (in_compat_syscall()) | |
7308 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7309 | sigsz); |
9e75ad5d AB |
7310 | else |
7311 | #endif | |
b772434b | 7312 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7313 | |
2b188cc1 JA |
7314 | if (ret) |
7315 | return ret; | |
7316 | } | |
7317 | ||
c73ebb68 | 7318 | if (uts) { |
c1d5a224 PB |
7319 | struct timespec64 ts; |
7320 | ||
c73ebb68 HX |
7321 | if (get_timespec64(&ts, uts)) |
7322 | return -EFAULT; | |
7323 | timeout = timespec64_to_jiffies(&ts); | |
7324 | } | |
7325 | ||
bda52162 | 7326 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7327 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7328 | do { |
6c503150 | 7329 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
bda52162 JA |
7330 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, |
7331 | TASK_INTERRUPTIBLE); | |
eeb60b9a PB |
7332 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
7333 | finish_wait(&ctx->wait, &iowq.wq); | |
7334 | } while (ret > 0); | |
bda52162 | 7335 | |
b7db41c9 | 7336 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7337 | |
75b28aff | 7338 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7339 | } |
7340 | ||
6b06314c JA |
7341 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7342 | { | |
7343 | #if defined(CONFIG_UNIX) | |
7344 | if (ctx->ring_sock) { | |
7345 | struct sock *sock = ctx->ring_sock->sk; | |
7346 | struct sk_buff *skb; | |
7347 | ||
7348 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7349 | kfree_skb(skb); | |
7350 | } | |
7351 | #else | |
7352 | int i; | |
7353 | ||
65e19f54 JA |
7354 | for (i = 0; i < ctx->nr_user_files; i++) { |
7355 | struct file *file; | |
7356 | ||
7357 | file = io_file_from_index(ctx, i); | |
7358 | if (file) | |
7359 | fput(file); | |
7360 | } | |
6b06314c JA |
7361 | #endif |
7362 | } | |
7363 | ||
00835dce | 7364 | static void io_rsrc_data_ref_zero(struct percpu_ref *ref) |
05f3fb3c | 7365 | { |
269bbe5f | 7366 | struct fixed_rsrc_data *data; |
05f3fb3c | 7367 | |
269bbe5f | 7368 | data = container_of(ref, struct fixed_rsrc_data, refs); |
05f3fb3c JA |
7369 | complete(&data->done); |
7370 | } | |
7371 | ||
2a63b2d9 BM |
7372 | static inline void io_rsrc_ref_lock(struct io_ring_ctx *ctx) |
7373 | { | |
7374 | spin_lock_bh(&ctx->rsrc_ref_lock); | |
7375 | } | |
7376 | ||
7377 | static inline void io_rsrc_ref_unlock(struct io_ring_ctx *ctx) | |
7378 | { | |
7379 | spin_unlock_bh(&ctx->rsrc_ref_lock); | |
7380 | } | |
7381 | ||
d67d2263 BM |
7382 | static void io_sqe_rsrc_set_node(struct io_ring_ctx *ctx, |
7383 | struct fixed_rsrc_data *rsrc_data, | |
269bbe5f | 7384 | struct fixed_rsrc_ref_node *ref_node) |
1642b445 | 7385 | { |
2a63b2d9 | 7386 | io_rsrc_ref_lock(ctx); |
269bbe5f | 7387 | rsrc_data->node = ref_node; |
d67d2263 | 7388 | list_add_tail(&ref_node->node, &ctx->rsrc_ref_list); |
2a63b2d9 | 7389 | io_rsrc_ref_unlock(ctx); |
269bbe5f | 7390 | percpu_ref_get(&rsrc_data->refs); |
1642b445 PB |
7391 | } |
7392 | ||
d7954b2b BM |
7393 | static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data, |
7394 | struct io_ring_ctx *ctx, | |
7395 | struct fixed_rsrc_ref_node *backup_node) | |
6b06314c | 7396 | { |
d7954b2b | 7397 | struct fixed_rsrc_ref_node *ref_node; |
1ffc5422 | 7398 | int ret; |
65e19f54 | 7399 | |
2a63b2d9 | 7400 | io_rsrc_ref_lock(ctx); |
1e5d770b | 7401 | ref_node = data->node; |
2a63b2d9 | 7402 | io_rsrc_ref_unlock(ctx); |
05589553 XW |
7403 | if (ref_node) |
7404 | percpu_ref_kill(&ref_node->refs); | |
7405 | ||
7406 | percpu_ref_kill(&data->refs); | |
7407 | ||
7408 | /* wait for all refs nodes to complete */ | |
269bbe5f | 7409 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 PB |
7410 | do { |
7411 | ret = wait_for_completion_interruptible(&data->done); | |
7412 | if (!ret) | |
7413 | break; | |
7414 | ret = io_run_task_work_sig(); | |
7415 | if (ret < 0) { | |
7416 | percpu_ref_resurrect(&data->refs); | |
7417 | reinit_completion(&data->done); | |
d67d2263 | 7418 | io_sqe_rsrc_set_node(ctx, data, backup_node); |
1ffc5422 PB |
7419 | return ret; |
7420 | } | |
7421 | } while (1); | |
05f3fb3c | 7422 | |
d7954b2b BM |
7423 | destroy_fixed_rsrc_ref_node(backup_node); |
7424 | return 0; | |
7425 | } | |
7426 | ||
1ad555c6 BM |
7427 | static struct fixed_rsrc_data *alloc_fixed_rsrc_data(struct io_ring_ctx *ctx) |
7428 | { | |
7429 | struct fixed_rsrc_data *data; | |
7430 | ||
7431 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7432 | if (!data) | |
7433 | return NULL; | |
7434 | ||
00835dce | 7435 | if (percpu_ref_init(&data->refs, io_rsrc_data_ref_zero, |
1ad555c6 BM |
7436 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7437 | kfree(data); | |
7438 | return NULL; | |
7439 | } | |
7440 | data->ctx = ctx; | |
7441 | init_completion(&data->done); | |
7442 | return data; | |
7443 | } | |
7444 | ||
7445 | static void free_fixed_rsrc_data(struct fixed_rsrc_data *data) | |
7446 | { | |
7447 | percpu_ref_exit(&data->refs); | |
7448 | kfree(data->table); | |
7449 | kfree(data); | |
7450 | } | |
7451 | ||
d7954b2b BM |
7452 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7453 | { | |
7454 | struct fixed_rsrc_data *data = ctx->file_data; | |
7455 | struct fixed_rsrc_ref_node *backup_node; | |
7456 | unsigned nr_tables, i; | |
7457 | int ret; | |
7458 | ||
7459 | if (!data) | |
7460 | return -ENXIO; | |
7461 | backup_node = alloc_fixed_rsrc_ref_node(ctx); | |
7462 | if (!backup_node) | |
7463 | return -ENOMEM; | |
7464 | init_fixed_file_ref_node(ctx, backup_node); | |
7465 | ||
7466 | ret = io_rsrc_ref_quiesce(data, ctx, backup_node); | |
7467 | if (ret) | |
7468 | return ret; | |
7469 | ||
6b06314c | 7470 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7471 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7472 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7473 | kfree(data->table[i].files); |
1ad555c6 | 7474 | free_fixed_rsrc_data(data); |
05f3fb3c | 7475 | ctx->file_data = NULL; |
6b06314c JA |
7476 | ctx->nr_user_files = 0; |
7477 | return 0; | |
7478 | } | |
7479 | ||
534ca6d6 | 7480 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7481 | { |
534ca6d6 | 7482 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7483 | /* |
7484 | * The park is a bit of a work-around, without it we get | |
7485 | * warning spews on shutdown with SQPOLL set and affinity | |
7486 | * set to a single CPU. | |
7487 | */ | |
534ca6d6 JA |
7488 | if (sqd->thread) { |
7489 | kthread_park(sqd->thread); | |
7490 | kthread_stop(sqd->thread); | |
7491 | } | |
7492 | ||
7493 | kfree(sqd); | |
7494 | } | |
7495 | } | |
7496 | ||
aa06165d JA |
7497 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7498 | { | |
7499 | struct io_ring_ctx *ctx_attach; | |
7500 | struct io_sq_data *sqd; | |
7501 | struct fd f; | |
7502 | ||
7503 | f = fdget(p->wq_fd); | |
7504 | if (!f.file) | |
7505 | return ERR_PTR(-ENXIO); | |
7506 | if (f.file->f_op != &io_uring_fops) { | |
7507 | fdput(f); | |
7508 | return ERR_PTR(-EINVAL); | |
7509 | } | |
7510 | ||
7511 | ctx_attach = f.file->private_data; | |
7512 | sqd = ctx_attach->sq_data; | |
7513 | if (!sqd) { | |
7514 | fdput(f); | |
7515 | return ERR_PTR(-EINVAL); | |
7516 | } | |
7517 | ||
7518 | refcount_inc(&sqd->refs); | |
7519 | fdput(f); | |
7520 | return sqd; | |
7521 | } | |
7522 | ||
534ca6d6 JA |
7523 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7524 | { | |
7525 | struct io_sq_data *sqd; | |
7526 | ||
aa06165d JA |
7527 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7528 | return io_attach_sq_data(p); | |
7529 | ||
534ca6d6 JA |
7530 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7531 | if (!sqd) | |
7532 | return ERR_PTR(-ENOMEM); | |
7533 | ||
7534 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7535 | INIT_LIST_HEAD(&sqd->ctx_list); |
7536 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7537 | mutex_init(&sqd->ctx_lock); | |
7538 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7539 | init_waitqueue_head(&sqd->wait); |
7540 | return sqd; | |
7541 | } | |
7542 | ||
69fb2131 JA |
7543 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7544 | __releases(&sqd->lock) | |
7545 | { | |
7546 | if (!sqd->thread) | |
7547 | return; | |
7548 | kthread_unpark(sqd->thread); | |
7549 | mutex_unlock(&sqd->lock); | |
7550 | } | |
7551 | ||
7552 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7553 | __acquires(&sqd->lock) | |
7554 | { | |
7555 | if (!sqd->thread) | |
7556 | return; | |
7557 | mutex_lock(&sqd->lock); | |
7558 | kthread_park(sqd->thread); | |
7559 | } | |
7560 | ||
534ca6d6 JA |
7561 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7562 | { | |
7563 | struct io_sq_data *sqd = ctx->sq_data; | |
7564 | ||
7565 | if (sqd) { | |
7566 | if (sqd->thread) { | |
7567 | /* | |
7568 | * We may arrive here from the error branch in | |
7569 | * io_sq_offload_create() where the kthread is created | |
7570 | * without being waked up, thus wake it up now to make | |
7571 | * sure the wait will complete. | |
7572 | */ | |
7573 | wake_up_process(sqd->thread); | |
7574 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7575 | |
7576 | io_sq_thread_park(sqd); | |
7577 | } | |
7578 | ||
7579 | mutex_lock(&sqd->ctx_lock); | |
7580 | list_del(&ctx->sqd_list); | |
08369246 | 7581 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7582 | mutex_unlock(&sqd->ctx_lock); |
7583 | ||
08369246 | 7584 | if (sqd->thread) |
69fb2131 | 7585 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7586 | |
7587 | io_put_sq_data(sqd); | |
7588 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7589 | } |
7590 | } | |
7591 | ||
6b06314c JA |
7592 | static void io_finish_async(struct io_ring_ctx *ctx) |
7593 | { | |
6c271ce2 JA |
7594 | io_sq_thread_stop(ctx); |
7595 | ||
561fb04a JA |
7596 | if (ctx->io_wq) { |
7597 | io_wq_destroy(ctx->io_wq); | |
7598 | ctx->io_wq = NULL; | |
6b06314c JA |
7599 | } |
7600 | } | |
7601 | ||
7602 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7603 | /* |
7604 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7605 | * the io_uring can be safely unregistered on process exit, even if we have | |
7606 | * loops in the file referencing. | |
7607 | */ | |
7608 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7609 | { | |
7610 | struct sock *sk = ctx->ring_sock->sk; | |
7611 | struct scm_fp_list *fpl; | |
7612 | struct sk_buff *skb; | |
08a45173 | 7613 | int i, nr_files; |
6b06314c | 7614 | |
6b06314c JA |
7615 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7616 | if (!fpl) | |
7617 | return -ENOMEM; | |
7618 | ||
7619 | skb = alloc_skb(0, GFP_KERNEL); | |
7620 | if (!skb) { | |
7621 | kfree(fpl); | |
7622 | return -ENOMEM; | |
7623 | } | |
7624 | ||
7625 | skb->sk = sk; | |
6b06314c | 7626 | |
08a45173 | 7627 | nr_files = 0; |
6b06314c JA |
7628 | fpl->user = get_uid(ctx->user); |
7629 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7630 | struct file *file = io_file_from_index(ctx, i + offset); |
7631 | ||
7632 | if (!file) | |
08a45173 | 7633 | continue; |
65e19f54 | 7634 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7635 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7636 | nr_files++; | |
6b06314c JA |
7637 | } |
7638 | ||
08a45173 JA |
7639 | if (nr_files) { |
7640 | fpl->max = SCM_MAX_FD; | |
7641 | fpl->count = nr_files; | |
7642 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7643 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7644 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7645 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7646 | |
08a45173 JA |
7647 | for (i = 0; i < nr_files; i++) |
7648 | fput(fpl->fp[i]); | |
7649 | } else { | |
7650 | kfree_skb(skb); | |
7651 | kfree(fpl); | |
7652 | } | |
6b06314c JA |
7653 | |
7654 | return 0; | |
7655 | } | |
7656 | ||
7657 | /* | |
7658 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7659 | * causes regular reference counting to break down. We rely on the UNIX | |
7660 | * garbage collection to take care of this problem for us. | |
7661 | */ | |
7662 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7663 | { | |
7664 | unsigned left, total; | |
7665 | int ret = 0; | |
7666 | ||
7667 | total = 0; | |
7668 | left = ctx->nr_user_files; | |
7669 | while (left) { | |
7670 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7671 | |
7672 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7673 | if (ret) | |
7674 | break; | |
7675 | left -= this_files; | |
7676 | total += this_files; | |
7677 | } | |
7678 | ||
7679 | if (!ret) | |
7680 | return 0; | |
7681 | ||
7682 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7683 | struct file *file = io_file_from_index(ctx, total); |
7684 | ||
7685 | if (file) | |
7686 | fput(file); | |
6b06314c JA |
7687 | total++; |
7688 | } | |
7689 | ||
7690 | return ret; | |
7691 | } | |
7692 | #else | |
7693 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7694 | { | |
7695 | return 0; | |
7696 | } | |
7697 | #endif | |
7698 | ||
269bbe5f | 7699 | static int io_sqe_alloc_file_tables(struct fixed_rsrc_data *file_data, |
5398ae69 | 7700 | unsigned nr_tables, unsigned nr_files) |
65e19f54 JA |
7701 | { |
7702 | int i; | |
7703 | ||
7704 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7705 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7706 | unsigned this_files; |
7707 | ||
7708 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7709 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7710 | GFP_KERNEL); | |
7711 | if (!table->files) | |
7712 | break; | |
7713 | nr_files -= this_files; | |
7714 | } | |
7715 | ||
7716 | if (i == nr_tables) | |
7717 | return 0; | |
7718 | ||
7719 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7720 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7721 | kfree(table->files); |
7722 | } | |
7723 | return 1; | |
7724 | } | |
7725 | ||
50238531 | 7726 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7727 | { |
50238531 | 7728 | struct file *file = prsrc->file; |
05f3fb3c JA |
7729 | #if defined(CONFIG_UNIX) |
7730 | struct sock *sock = ctx->ring_sock->sk; | |
7731 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7732 | struct sk_buff *skb; | |
7733 | int i; | |
7734 | ||
7735 | __skb_queue_head_init(&list); | |
7736 | ||
7737 | /* | |
7738 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7739 | * remove this entry and rearrange the file array. | |
7740 | */ | |
7741 | skb = skb_dequeue(head); | |
7742 | while (skb) { | |
7743 | struct scm_fp_list *fp; | |
7744 | ||
7745 | fp = UNIXCB(skb).fp; | |
7746 | for (i = 0; i < fp->count; i++) { | |
7747 | int left; | |
7748 | ||
7749 | if (fp->fp[i] != file) | |
7750 | continue; | |
7751 | ||
7752 | unix_notinflight(fp->user, fp->fp[i]); | |
7753 | left = fp->count - 1 - i; | |
7754 | if (left) { | |
7755 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7756 | left * sizeof(struct file *)); | |
7757 | } | |
7758 | fp->count--; | |
7759 | if (!fp->count) { | |
7760 | kfree_skb(skb); | |
7761 | skb = NULL; | |
7762 | } else { | |
7763 | __skb_queue_tail(&list, skb); | |
7764 | } | |
7765 | fput(file); | |
7766 | file = NULL; | |
7767 | break; | |
7768 | } | |
7769 | ||
7770 | if (!file) | |
7771 | break; | |
7772 | ||
7773 | __skb_queue_tail(&list, skb); | |
7774 | ||
7775 | skb = skb_dequeue(head); | |
7776 | } | |
7777 | ||
7778 | if (skb_peek(&list)) { | |
7779 | spin_lock_irq(&head->lock); | |
7780 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7781 | __skb_queue_tail(head, skb); | |
7782 | spin_unlock_irq(&head->lock); | |
7783 | } | |
7784 | #else | |
7785 | fput(file); | |
7786 | #endif | |
7787 | } | |
7788 | ||
269bbe5f | 7789 | static void __io_rsrc_put_work(struct fixed_rsrc_ref_node *ref_node) |
65e19f54 | 7790 | { |
269bbe5f BM |
7791 | struct fixed_rsrc_data *rsrc_data = ref_node->rsrc_data; |
7792 | struct io_ring_ctx *ctx = rsrc_data->ctx; | |
7793 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7794 | |
269bbe5f BM |
7795 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7796 | list_del(&prsrc->list); | |
50238531 | 7797 | ref_node->rsrc_put(ctx, prsrc); |
269bbe5f | 7798 | kfree(prsrc); |
65e19f54 | 7799 | } |
05589553 | 7800 | |
05589553 XW |
7801 | percpu_ref_exit(&ref_node->refs); |
7802 | kfree(ref_node); | |
269bbe5f | 7803 | percpu_ref_put(&rsrc_data->refs); |
2faf852d | 7804 | } |
65e19f54 | 7805 | |
269bbe5f | 7806 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7807 | { |
7808 | struct io_ring_ctx *ctx; | |
7809 | struct llist_node *node; | |
7810 | ||
269bbe5f BM |
7811 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7812 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7813 | |
7814 | while (node) { | |
269bbe5f | 7815 | struct fixed_rsrc_ref_node *ref_node; |
4a38aed2 JA |
7816 | struct llist_node *next = node->next; |
7817 | ||
269bbe5f BM |
7818 | ref_node = llist_entry(node, struct fixed_rsrc_ref_node, llist); |
7819 | __io_rsrc_put_work(ref_node); | |
4a38aed2 JA |
7820 | node = next; |
7821 | } | |
7822 | } | |
7823 | ||
ea64ec02 PB |
7824 | static struct file **io_fixed_file_slot(struct fixed_rsrc_data *file_data, |
7825 | unsigned i) | |
7826 | { | |
7827 | struct fixed_rsrc_table *table; | |
7828 | ||
7829 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7830 | return &table->files[i & IORING_FILE_TABLE_MASK]; | |
7831 | } | |
7832 | ||
00835dce | 7833 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
2faf852d | 7834 | { |
269bbe5f BM |
7835 | struct fixed_rsrc_ref_node *ref_node; |
7836 | struct fixed_rsrc_data *data; | |
4a38aed2 | 7837 | struct io_ring_ctx *ctx; |
e297822b | 7838 | bool first_add = false; |
4a38aed2 | 7839 | int delay = HZ; |
65e19f54 | 7840 | |
269bbe5f BM |
7841 | ref_node = container_of(ref, struct fixed_rsrc_ref_node, refs); |
7842 | data = ref_node->rsrc_data; | |
e297822b PB |
7843 | ctx = data->ctx; |
7844 | ||
2a63b2d9 | 7845 | io_rsrc_ref_lock(ctx); |
e297822b PB |
7846 | ref_node->done = true; |
7847 | ||
d67d2263 BM |
7848 | while (!list_empty(&ctx->rsrc_ref_list)) { |
7849 | ref_node = list_first_entry(&ctx->rsrc_ref_list, | |
269bbe5f | 7850 | struct fixed_rsrc_ref_node, node); |
e297822b PB |
7851 | /* recycle ref nodes in order */ |
7852 | if (!ref_node->done) | |
7853 | break; | |
7854 | list_del(&ref_node->node); | |
269bbe5f | 7855 | first_add |= llist_add(&ref_node->llist, &ctx->rsrc_put_llist); |
e297822b | 7856 | } |
2a63b2d9 | 7857 | io_rsrc_ref_unlock(ctx); |
05589553 | 7858 | |
e297822b | 7859 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7860 | delay = 0; |
05589553 | 7861 | |
4a38aed2 | 7862 | if (!delay) |
269bbe5f | 7863 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, 0); |
4a38aed2 | 7864 | else if (first_add) |
269bbe5f | 7865 | queue_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
05f3fb3c | 7866 | } |
65e19f54 | 7867 | |
6802535d | 7868 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
05589553 | 7869 | struct io_ring_ctx *ctx) |
05f3fb3c | 7870 | { |
269bbe5f | 7871 | struct fixed_rsrc_ref_node *ref_node; |
05f3fb3c | 7872 | |
05589553 XW |
7873 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7874 | if (!ref_node) | |
3e2224c5 | 7875 | return NULL; |
05f3fb3c | 7876 | |
00835dce | 7877 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
05589553 XW |
7878 | 0, GFP_KERNEL)) { |
7879 | kfree(ref_node); | |
3e2224c5 | 7880 | return NULL; |
05589553 XW |
7881 | } |
7882 | INIT_LIST_HEAD(&ref_node->node); | |
269bbe5f | 7883 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
6802535d BM |
7884 | ref_node->done = false; |
7885 | return ref_node; | |
7886 | } | |
7887 | ||
bc9744cd PB |
7888 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
7889 | struct fixed_rsrc_ref_node *ref_node) | |
6802535d | 7890 | { |
269bbe5f | 7891 | ref_node->rsrc_data = ctx->file_data; |
50238531 | 7892 | ref_node->rsrc_put = io_ring_file_put; |
05589553 XW |
7893 | } |
7894 | ||
269bbe5f | 7895 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node) |
05589553 XW |
7896 | { |
7897 | percpu_ref_exit(&ref_node->refs); | |
7898 | kfree(ref_node); | |
65e19f54 JA |
7899 | } |
7900 | ||
ea64ec02 | 7901 | |
6b06314c JA |
7902 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7903 | unsigned nr_args) | |
7904 | { | |
7905 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7906 | unsigned nr_tables, i; |
05f3fb3c | 7907 | struct file *file; |
600cf3f8 | 7908 | int fd, ret = -ENOMEM; |
269bbe5f BM |
7909 | struct fixed_rsrc_ref_node *ref_node; |
7910 | struct fixed_rsrc_data *file_data; | |
6b06314c | 7911 | |
05f3fb3c | 7912 | if (ctx->file_data) |
6b06314c JA |
7913 | return -EBUSY; |
7914 | if (!nr_args) | |
7915 | return -EINVAL; | |
7916 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7917 | return -EMFILE; | |
7918 | ||
1ad555c6 | 7919 | file_data = alloc_fixed_rsrc_data(ctx); |
5398ae69 | 7920 | if (!file_data) |
05f3fb3c | 7921 | return -ENOMEM; |
13770a71 | 7922 | ctx->file_data = file_data; |
05f3fb3c | 7923 | |
65e19f54 | 7924 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7925 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7926 | GFP_KERNEL); |
600cf3f8 PB |
7927 | if (!file_data->table) |
7928 | goto out_free; | |
05f3fb3c | 7929 | |
600cf3f8 | 7930 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
1ad555c6 | 7931 | goto out_free; |
65e19f54 | 7932 | |
08a45173 | 7933 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
600cf3f8 PB |
7934 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7935 | ret = -EFAULT; | |
7936 | goto out_fput; | |
7937 | } | |
08a45173 | 7938 | /* allow sparse sets */ |
600cf3f8 | 7939 | if (fd == -1) |
08a45173 | 7940 | continue; |
6b06314c | 7941 | |
05f3fb3c | 7942 | file = fget(fd); |
6b06314c | 7943 | ret = -EBADF; |
05f3fb3c | 7944 | if (!file) |
600cf3f8 | 7945 | goto out_fput; |
05f3fb3c | 7946 | |
6b06314c JA |
7947 | /* |
7948 | * Don't allow io_uring instances to be registered. If UNIX | |
7949 | * isn't enabled, then this causes a reference cycle and this | |
7950 | * instance can never get freed. If UNIX is enabled we'll | |
7951 | * handle it just fine, but there's still no point in allowing | |
7952 | * a ring fd as it doesn't support regular read/write anyway. | |
7953 | */ | |
05f3fb3c JA |
7954 | if (file->f_op == &io_uring_fops) { |
7955 | fput(file); | |
600cf3f8 | 7956 | goto out_fput; |
6b06314c | 7957 | } |
ea64ec02 | 7958 | *io_fixed_file_slot(file_data, i) = file; |
6b06314c JA |
7959 | } |
7960 | ||
6b06314c | 7961 | ret = io_sqe_files_scm(ctx); |
05589553 | 7962 | if (ret) { |
6b06314c | 7963 | io_sqe_files_unregister(ctx); |
05589553 XW |
7964 | return ret; |
7965 | } | |
6b06314c | 7966 | |
bc9744cd | 7967 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 | 7968 | if (!ref_node) { |
05589553 | 7969 | io_sqe_files_unregister(ctx); |
3e2224c5 | 7970 | return -ENOMEM; |
05589553 | 7971 | } |
bc9744cd | 7972 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 7973 | |
d67d2263 | 7974 | io_sqe_rsrc_set_node(ctx, file_data, ref_node); |
6b06314c | 7975 | return ret; |
600cf3f8 PB |
7976 | out_fput: |
7977 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7978 | file = io_file_from_index(ctx, i); | |
7979 | if (file) | |
7980 | fput(file); | |
7981 | } | |
7982 | for (i = 0; i < nr_tables; i++) | |
7983 | kfree(file_data->table[i].files); | |
7984 | ctx->nr_user_files = 0; | |
600cf3f8 | 7985 | out_free: |
1ad555c6 | 7986 | free_fixed_rsrc_data(ctx->file_data); |
55cbc256 | 7987 | ctx->file_data = NULL; |
6b06314c JA |
7988 | return ret; |
7989 | } | |
7990 | ||
c3a31e60 JA |
7991 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7992 | int index) | |
7993 | { | |
7994 | #if defined(CONFIG_UNIX) | |
7995 | struct sock *sock = ctx->ring_sock->sk; | |
7996 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7997 | struct sk_buff *skb; | |
7998 | ||
7999 | /* | |
8000 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8001 | * file set. If there's no room, fall back to allocating a new skb | |
8002 | * and filling it in. | |
8003 | */ | |
8004 | spin_lock_irq(&head->lock); | |
8005 | skb = skb_peek(head); | |
8006 | if (skb) { | |
8007 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8008 | ||
8009 | if (fpl->count < SCM_MAX_FD) { | |
8010 | __skb_unlink(skb, head); | |
8011 | spin_unlock_irq(&head->lock); | |
8012 | fpl->fp[fpl->count] = get_file(file); | |
8013 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8014 | fpl->count++; | |
8015 | spin_lock_irq(&head->lock); | |
8016 | __skb_queue_head(head, skb); | |
8017 | } else { | |
8018 | skb = NULL; | |
8019 | } | |
8020 | } | |
8021 | spin_unlock_irq(&head->lock); | |
8022 | ||
8023 | if (skb) { | |
8024 | fput(file); | |
8025 | return 0; | |
8026 | } | |
8027 | ||
8028 | return __io_sqe_files_scm(ctx, 1, index); | |
8029 | #else | |
8030 | return 0; | |
8031 | #endif | |
8032 | } | |
8033 | ||
50238531 | 8034 | static int io_queue_rsrc_removal(struct fixed_rsrc_data *data, void *rsrc) |
05f3fb3c | 8035 | { |
269bbe5f BM |
8036 | struct io_rsrc_put *prsrc; |
8037 | struct fixed_rsrc_ref_node *ref_node = data->node; | |
05f3fb3c | 8038 | |
269bbe5f BM |
8039 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
8040 | if (!prsrc) | |
a5318d3c | 8041 | return -ENOMEM; |
05f3fb3c | 8042 | |
50238531 | 8043 | prsrc->rsrc = rsrc; |
269bbe5f | 8044 | list_add(&prsrc->list, &ref_node->rsrc_list); |
05589553 | 8045 | |
a5318d3c | 8046 | return 0; |
05f3fb3c JA |
8047 | } |
8048 | ||
269bbe5f BM |
8049 | static inline int io_queue_file_removal(struct fixed_rsrc_data *data, |
8050 | struct file *file) | |
8051 | { | |
50238531 | 8052 | return io_queue_rsrc_removal(data, (void *)file); |
269bbe5f BM |
8053 | } |
8054 | ||
05f3fb3c | 8055 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 8056 | struct io_uring_rsrc_update *up, |
05f3fb3c JA |
8057 | unsigned nr_args) |
8058 | { | |
269bbe5f BM |
8059 | struct fixed_rsrc_data *data = ctx->file_data; |
8060 | struct fixed_rsrc_ref_node *ref_node; | |
ea64ec02 | 8061 | struct file *file, **file_slot; |
c3a31e60 JA |
8062 | __s32 __user *fds; |
8063 | int fd, i, err; | |
8064 | __u32 done; | |
05589553 | 8065 | bool needs_switch = false; |
c3a31e60 | 8066 | |
05f3fb3c | 8067 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
8068 | return -EOVERFLOW; |
8069 | if (done > ctx->nr_user_files) | |
8070 | return -EINVAL; | |
8071 | ||
bc9744cd | 8072 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 MWO |
8073 | if (!ref_node) |
8074 | return -ENOMEM; | |
bc9744cd | 8075 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 8076 | |
269bbe5f | 8077 | fds = u64_to_user_ptr(up->data); |
67973b93 | 8078 | for (done = 0; done < nr_args; done++) { |
c3a31e60 JA |
8079 | err = 0; |
8080 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
8081 | err = -EFAULT; | |
8082 | break; | |
8083 | } | |
4e0377a1 | 8084 | if (fd == IORING_REGISTER_FILES_SKIP) |
8085 | continue; | |
8086 | ||
67973b93 | 8087 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
ea64ec02 PB |
8088 | file_slot = io_fixed_file_slot(ctx->file_data, i); |
8089 | ||
8090 | if (*file_slot) { | |
8091 | err = io_queue_file_removal(data, *file_slot); | |
a5318d3c HD |
8092 | if (err) |
8093 | break; | |
ea64ec02 | 8094 | *file_slot = NULL; |
05589553 | 8095 | needs_switch = true; |
c3a31e60 JA |
8096 | } |
8097 | if (fd != -1) { | |
c3a31e60 JA |
8098 | file = fget(fd); |
8099 | if (!file) { | |
8100 | err = -EBADF; | |
8101 | break; | |
8102 | } | |
8103 | /* | |
8104 | * Don't allow io_uring instances to be registered. If | |
8105 | * UNIX isn't enabled, then this causes a reference | |
8106 | * cycle and this instance can never get freed. If UNIX | |
8107 | * is enabled we'll handle it just fine, but there's | |
8108 | * still no point in allowing a ring fd as it doesn't | |
8109 | * support regular read/write anyway. | |
8110 | */ | |
8111 | if (file->f_op == &io_uring_fops) { | |
8112 | fput(file); | |
8113 | err = -EBADF; | |
8114 | break; | |
8115 | } | |
e68a3ff8 | 8116 | *file_slot = file; |
c3a31e60 | 8117 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8118 | if (err) { |
e68a3ff8 | 8119 | *file_slot = NULL; |
f3bd9dae | 8120 | fput(file); |
c3a31e60 | 8121 | break; |
f3bd9dae | 8122 | } |
c3a31e60 | 8123 | } |
05f3fb3c JA |
8124 | } |
8125 | ||
05589553 | 8126 | if (needs_switch) { |
b2e96852 | 8127 | percpu_ref_kill(&data->node->refs); |
d67d2263 | 8128 | io_sqe_rsrc_set_node(ctx, data, ref_node); |
05589553 | 8129 | } else |
269bbe5f | 8130 | destroy_fixed_rsrc_ref_node(ref_node); |
c3a31e60 JA |
8131 | |
8132 | return done ? done : err; | |
8133 | } | |
05589553 | 8134 | |
05f3fb3c JA |
8135 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
8136 | unsigned nr_args) | |
8137 | { | |
269bbe5f | 8138 | struct io_uring_rsrc_update up; |
05f3fb3c JA |
8139 | |
8140 | if (!ctx->file_data) | |
8141 | return -ENXIO; | |
8142 | if (!nr_args) | |
8143 | return -EINVAL; | |
8144 | if (copy_from_user(&up, arg, sizeof(up))) | |
8145 | return -EFAULT; | |
8146 | if (up.resv) | |
8147 | return -EINVAL; | |
8148 | ||
8149 | return __io_sqe_files_update(ctx, &up, nr_args); | |
8150 | } | |
c3a31e60 | 8151 | |
5280f7e5 | 8152 | static struct io_wq_work *io_free_work(struct io_wq_work *work) |
7d723065 JA |
8153 | { |
8154 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8155 | ||
5280f7e5 PB |
8156 | req = io_put_req_find_next(req); |
8157 | return req ? &req->work : NULL; | |
7d723065 JA |
8158 | } |
8159 | ||
24369c2e PB |
8160 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
8161 | struct io_uring_params *p) | |
8162 | { | |
8163 | struct io_wq_data data; | |
8164 | struct fd f; | |
8165 | struct io_ring_ctx *ctx_attach; | |
8166 | unsigned int concurrency; | |
8167 | int ret = 0; | |
8168 | ||
8169 | data.user = ctx->user; | |
e9fd9396 | 8170 | data.free_work = io_free_work; |
f5fa38c5 | 8171 | data.do_work = io_wq_submit_work; |
24369c2e PB |
8172 | |
8173 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
8174 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
8175 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
8176 | ||
8177 | ctx->io_wq = io_wq_create(concurrency, &data); | |
8178 | if (IS_ERR(ctx->io_wq)) { | |
8179 | ret = PTR_ERR(ctx->io_wq); | |
8180 | ctx->io_wq = NULL; | |
8181 | } | |
8182 | return ret; | |
8183 | } | |
8184 | ||
8185 | f = fdget(p->wq_fd); | |
8186 | if (!f.file) | |
8187 | return -EBADF; | |
8188 | ||
8189 | if (f.file->f_op != &io_uring_fops) { | |
8190 | ret = -EINVAL; | |
8191 | goto out_fput; | |
8192 | } | |
8193 | ||
8194 | ctx_attach = f.file->private_data; | |
8195 | /* @io_wq is protected by holding the fd */ | |
8196 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
8197 | ret = -EINVAL; | |
8198 | goto out_fput; | |
8199 | } | |
8200 | ||
8201 | ctx->io_wq = ctx_attach->io_wq; | |
8202 | out_fput: | |
8203 | fdput(f); | |
8204 | return ret; | |
8205 | } | |
8206 | ||
0f212204 JA |
8207 | static int io_uring_alloc_task_context(struct task_struct *task) |
8208 | { | |
8209 | struct io_uring_task *tctx; | |
d8a6df10 | 8210 | int ret; |
0f212204 JA |
8211 | |
8212 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
8213 | if (unlikely(!tctx)) | |
8214 | return -ENOMEM; | |
8215 | ||
d8a6df10 JA |
8216 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8217 | if (unlikely(ret)) { | |
8218 | kfree(tctx); | |
8219 | return ret; | |
8220 | } | |
8221 | ||
0f212204 JA |
8222 | xa_init(&tctx->xa); |
8223 | init_waitqueue_head(&tctx->wait); | |
8224 | tctx->last = NULL; | |
fdaf083c JA |
8225 | atomic_set(&tctx->in_idle, 0); |
8226 | tctx->sqpoll = false; | |
500a373d JA |
8227 | io_init_identity(&tctx->__identity); |
8228 | tctx->identity = &tctx->__identity; | |
0f212204 | 8229 | task->io_uring = tctx; |
7cbf1722 JA |
8230 | spin_lock_init(&tctx->task_lock); |
8231 | INIT_WQ_LIST(&tctx->task_list); | |
8232 | tctx->task_state = 0; | |
8233 | init_task_work(&tctx->task_work, tctx_task_work); | |
0f212204 JA |
8234 | return 0; |
8235 | } | |
8236 | ||
8237 | void __io_uring_free(struct task_struct *tsk) | |
8238 | { | |
8239 | struct io_uring_task *tctx = tsk->io_uring; | |
8240 | ||
8241 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8242 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8243 | if (tctx->identity != &tctx->__identity) | |
8244 | kfree(tctx->identity); | |
d8a6df10 | 8245 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8246 | kfree(tctx); |
8247 | tsk->io_uring = NULL; | |
8248 | } | |
8249 | ||
7e84e1c7 SG |
8250 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8251 | struct io_uring_params *p) | |
2b188cc1 JA |
8252 | { |
8253 | int ret; | |
8254 | ||
6c271ce2 | 8255 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8256 | struct io_sq_data *sqd; |
8257 | ||
3ec482d1 | 8258 | ret = -EPERM; |
ce59fc69 | 8259 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8260 | goto err; |
8261 | ||
534ca6d6 JA |
8262 | sqd = io_get_sq_data(p); |
8263 | if (IS_ERR(sqd)) { | |
8264 | ret = PTR_ERR(sqd); | |
8265 | goto err; | |
8266 | } | |
69fb2131 | 8267 | |
534ca6d6 | 8268 | ctx->sq_data = sqd; |
69fb2131 JA |
8269 | io_sq_thread_park(sqd); |
8270 | mutex_lock(&sqd->ctx_lock); | |
8271 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8272 | mutex_unlock(&sqd->ctx_lock); | |
8273 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8274 | |
917257da JA |
8275 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8276 | if (!ctx->sq_thread_idle) | |
8277 | ctx->sq_thread_idle = HZ; | |
8278 | ||
aa06165d JA |
8279 | if (sqd->thread) |
8280 | goto done; | |
8281 | ||
6c271ce2 | 8282 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8283 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8284 | |
917257da | 8285 | ret = -EINVAL; |
44a9bd18 JA |
8286 | if (cpu >= nr_cpu_ids) |
8287 | goto err; | |
7889f44d | 8288 | if (!cpu_online(cpu)) |
917257da JA |
8289 | goto err; |
8290 | ||
69fb2131 | 8291 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8292 | cpu, "io_uring-sq"); |
6c271ce2 | 8293 | } else { |
69fb2131 | 8294 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8295 | "io_uring-sq"); |
8296 | } | |
534ca6d6 JA |
8297 | if (IS_ERR(sqd->thread)) { |
8298 | ret = PTR_ERR(sqd->thread); | |
8299 | sqd->thread = NULL; | |
6c271ce2 JA |
8300 | goto err; |
8301 | } | |
534ca6d6 | 8302 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8303 | if (ret) |
8304 | goto err; | |
6c271ce2 JA |
8305 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8306 | /* Can't have SQ_AFF without SQPOLL */ | |
8307 | ret = -EINVAL; | |
8308 | goto err; | |
8309 | } | |
8310 | ||
aa06165d | 8311 | done: |
24369c2e PB |
8312 | ret = io_init_wq_offload(ctx, p); |
8313 | if (ret) | |
2b188cc1 | 8314 | goto err; |
2b188cc1 JA |
8315 | |
8316 | return 0; | |
8317 | err: | |
54a91f3b | 8318 | io_finish_async(ctx); |
2b188cc1 JA |
8319 | return ret; |
8320 | } | |
8321 | ||
7e84e1c7 SG |
8322 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8323 | { | |
534ca6d6 JA |
8324 | struct io_sq_data *sqd = ctx->sq_data; |
8325 | ||
8326 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8327 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8328 | } |
8329 | ||
a087e2b5 BM |
8330 | static inline void __io_unaccount_mem(struct user_struct *user, |
8331 | unsigned long nr_pages) | |
2b188cc1 JA |
8332 | { |
8333 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8334 | } | |
8335 | ||
a087e2b5 BM |
8336 | static inline int __io_account_mem(struct user_struct *user, |
8337 | unsigned long nr_pages) | |
2b188cc1 JA |
8338 | { |
8339 | unsigned long page_limit, cur_pages, new_pages; | |
8340 | ||
8341 | /* Don't allow more pages than we can safely lock */ | |
8342 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8343 | ||
8344 | do { | |
8345 | cur_pages = atomic_long_read(&user->locked_vm); | |
8346 | new_pages = cur_pages + nr_pages; | |
8347 | if (new_pages > page_limit) | |
8348 | return -ENOMEM; | |
8349 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8350 | new_pages) != cur_pages); | |
8351 | ||
8352 | return 0; | |
8353 | } | |
8354 | ||
26bfa89e | 8355 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8356 | { |
aad5d8da | 8357 | if (ctx->limit_mem) |
a087e2b5 | 8358 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8359 | |
26bfa89e JA |
8360 | if (ctx->mm_account) |
8361 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8362 | } |
8363 | ||
26bfa89e | 8364 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8365 | { |
30975825 BM |
8366 | int ret; |
8367 | ||
8368 | if (ctx->limit_mem) { | |
8369 | ret = __io_account_mem(ctx->user, nr_pages); | |
8370 | if (ret) | |
8371 | return ret; | |
8372 | } | |
8373 | ||
26bfa89e JA |
8374 | if (ctx->mm_account) |
8375 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8376 | |
8377 | return 0; | |
8378 | } | |
8379 | ||
2b188cc1 JA |
8380 | static void io_mem_free(void *ptr) |
8381 | { | |
52e04ef4 MR |
8382 | struct page *page; |
8383 | ||
8384 | if (!ptr) | |
8385 | return; | |
2b188cc1 | 8386 | |
52e04ef4 | 8387 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8388 | if (put_page_testzero(page)) |
8389 | free_compound_page(page); | |
8390 | } | |
8391 | ||
8392 | static void *io_mem_alloc(size_t size) | |
8393 | { | |
8394 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8395 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8396 | |
8397 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8398 | } | |
8399 | ||
75b28aff HV |
8400 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8401 | size_t *sq_offset) | |
8402 | { | |
8403 | struct io_rings *rings; | |
8404 | size_t off, sq_array_size; | |
8405 | ||
8406 | off = struct_size(rings, cqes, cq_entries); | |
8407 | if (off == SIZE_MAX) | |
8408 | return SIZE_MAX; | |
8409 | ||
8410 | #ifdef CONFIG_SMP | |
8411 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8412 | if (off == 0) | |
8413 | return SIZE_MAX; | |
8414 | #endif | |
8415 | ||
b36200f5 DV |
8416 | if (sq_offset) |
8417 | *sq_offset = off; | |
8418 | ||
75b28aff HV |
8419 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8420 | if (sq_array_size == SIZE_MAX) | |
8421 | return SIZE_MAX; | |
8422 | ||
8423 | if (check_add_overflow(off, sq_array_size, &off)) | |
8424 | return SIZE_MAX; | |
8425 | ||
75b28aff HV |
8426 | return off; |
8427 | } | |
8428 | ||
0a96bbe4 | 8429 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee JA |
8430 | { |
8431 | int i, j; | |
8432 | ||
8433 | if (!ctx->user_bufs) | |
8434 | return -ENXIO; | |
8435 | ||
8436 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8437 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8438 | ||
8439 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8440 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8441 | |
de293938 | 8442 | if (imu->acct_pages) |
26bfa89e | 8443 | io_unaccount_mem(ctx, imu->acct_pages); |
d4ef6475 | 8444 | kvfree(imu->bvec); |
edafccee JA |
8445 | imu->nr_bvecs = 0; |
8446 | } | |
8447 | ||
8448 | kfree(ctx->user_bufs); | |
8449 | ctx->user_bufs = NULL; | |
8450 | ctx->nr_user_bufs = 0; | |
8451 | return 0; | |
8452 | } | |
8453 | ||
8454 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8455 | void __user *arg, unsigned index) | |
8456 | { | |
8457 | struct iovec __user *src; | |
8458 | ||
8459 | #ifdef CONFIG_COMPAT | |
8460 | if (ctx->compat) { | |
8461 | struct compat_iovec __user *ciovs; | |
8462 | struct compat_iovec ciov; | |
8463 | ||
8464 | ciovs = (struct compat_iovec __user *) arg; | |
8465 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8466 | return -EFAULT; | |
8467 | ||
d55e5f5b | 8468 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8469 | dst->iov_len = ciov.iov_len; |
8470 | return 0; | |
8471 | } | |
8472 | #endif | |
8473 | src = (struct iovec __user *) arg; | |
8474 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8475 | return -EFAULT; | |
8476 | return 0; | |
8477 | } | |
8478 | ||
de293938 JA |
8479 | /* |
8480 | * Not super efficient, but this is just a registration time. And we do cache | |
8481 | * the last compound head, so generally we'll only do a full search if we don't | |
8482 | * match that one. | |
8483 | * | |
8484 | * We check if the given compound head page has already been accounted, to | |
8485 | * avoid double accounting it. This allows us to account the full size of the | |
8486 | * page, not just the constituent pages of a huge page. | |
8487 | */ | |
8488 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8489 | int nr_pages, struct page *hpage) | |
8490 | { | |
8491 | int i, j; | |
8492 | ||
8493 | /* check current page array */ | |
8494 | for (i = 0; i < nr_pages; i++) { | |
8495 | if (!PageCompound(pages[i])) | |
8496 | continue; | |
8497 | if (compound_head(pages[i]) == hpage) | |
8498 | return true; | |
8499 | } | |
8500 | ||
8501 | /* check previously registered pages */ | |
8502 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8503 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8504 | ||
8505 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8506 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8507 | continue; | |
8508 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8509 | return true; | |
8510 | } | |
8511 | } | |
8512 | ||
8513 | return false; | |
8514 | } | |
8515 | ||
8516 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8517 | int nr_pages, struct io_mapped_ubuf *imu, | |
8518 | struct page **last_hpage) | |
8519 | { | |
8520 | int i, ret; | |
8521 | ||
8522 | for (i = 0; i < nr_pages; i++) { | |
8523 | if (!PageCompound(pages[i])) { | |
8524 | imu->acct_pages++; | |
8525 | } else { | |
8526 | struct page *hpage; | |
8527 | ||
8528 | hpage = compound_head(pages[i]); | |
8529 | if (hpage == *last_hpage) | |
8530 | continue; | |
8531 | *last_hpage = hpage; | |
8532 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8533 | continue; | |
8534 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8535 | } | |
8536 | } | |
8537 | ||
8538 | if (!imu->acct_pages) | |
8539 | return 0; | |
8540 | ||
26bfa89e | 8541 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8542 | if (ret) |
8543 | imu->acct_pages = 0; | |
8544 | return ret; | |
8545 | } | |
8546 | ||
0a96bbe4 BM |
8547 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
8548 | struct io_mapped_ubuf *imu, | |
8549 | struct page **last_hpage) | |
edafccee JA |
8550 | { |
8551 | struct vm_area_struct **vmas = NULL; | |
8552 | struct page **pages = NULL; | |
0a96bbe4 BM |
8553 | unsigned long off, start, end, ubuf; |
8554 | size_t size; | |
8555 | int ret, pret, nr_pages, i; | |
8556 | ||
8557 | ubuf = (unsigned long) iov->iov_base; | |
8558 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8559 | start = ubuf >> PAGE_SHIFT; | |
8560 | nr_pages = end - start; | |
8561 | ||
8562 | ret = -ENOMEM; | |
8563 | ||
8564 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8565 | if (!pages) | |
8566 | goto done; | |
8567 | ||
8568 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8569 | GFP_KERNEL); | |
8570 | if (!vmas) | |
8571 | goto done; | |
8572 | ||
8573 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), | |
8574 | GFP_KERNEL); | |
8575 | if (!imu->bvec) | |
8576 | goto done; | |
8577 | ||
8578 | ret = 0; | |
8579 | mmap_read_lock(current->mm); | |
8580 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8581 | pages, vmas); | |
8582 | if (pret == nr_pages) { | |
8583 | /* don't support file backed memory */ | |
8584 | for (i = 0; i < nr_pages; i++) { | |
8585 | struct vm_area_struct *vma = vmas[i]; | |
8586 | ||
8587 | if (vma->vm_file && | |
8588 | !is_file_hugepages(vma->vm_file)) { | |
8589 | ret = -EOPNOTSUPP; | |
8590 | break; | |
8591 | } | |
8592 | } | |
8593 | } else { | |
8594 | ret = pret < 0 ? pret : -EFAULT; | |
8595 | } | |
8596 | mmap_read_unlock(current->mm); | |
8597 | if (ret) { | |
8598 | /* | |
8599 | * if we did partial map, or found file backed vmas, | |
8600 | * release any pages we did get | |
8601 | */ | |
8602 | if (pret > 0) | |
8603 | unpin_user_pages(pages, pret); | |
8604 | kvfree(imu->bvec); | |
8605 | goto done; | |
8606 | } | |
8607 | ||
8608 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8609 | if (ret) { | |
8610 | unpin_user_pages(pages, pret); | |
8611 | kvfree(imu->bvec); | |
8612 | goto done; | |
8613 | } | |
8614 | ||
8615 | off = ubuf & ~PAGE_MASK; | |
8616 | size = iov->iov_len; | |
8617 | for (i = 0; i < nr_pages; i++) { | |
8618 | size_t vec_len; | |
8619 | ||
8620 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8621 | imu->bvec[i].bv_page = pages[i]; | |
8622 | imu->bvec[i].bv_len = vec_len; | |
8623 | imu->bvec[i].bv_offset = off; | |
8624 | off = 0; | |
8625 | size -= vec_len; | |
8626 | } | |
8627 | /* store original address for later verification */ | |
8628 | imu->ubuf = ubuf; | |
8629 | imu->len = iov->iov_len; | |
8630 | imu->nr_bvecs = nr_pages; | |
8631 | ret = 0; | |
8632 | done: | |
8633 | kvfree(pages); | |
8634 | kvfree(vmas); | |
8635 | return ret; | |
8636 | } | |
8637 | ||
2b358604 | 8638 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8639 | { |
edafccee JA |
8640 | if (ctx->user_bufs) |
8641 | return -EBUSY; | |
8642 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8643 | return -EINVAL; | |
8644 | ||
8645 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8646 | GFP_KERNEL); | |
8647 | if (!ctx->user_bufs) | |
8648 | return -ENOMEM; | |
8649 | ||
2b358604 BM |
8650 | return 0; |
8651 | } | |
8652 | ||
8653 | static int io_buffer_validate(struct iovec *iov) | |
8654 | { | |
8655 | /* | |
8656 | * Don't impose further limits on the size and buffer | |
8657 | * constraints here, we'll -EINVAL later when IO is | |
8658 | * submitted if they are wrong. | |
8659 | */ | |
8660 | if (!iov->iov_base || !iov->iov_len) | |
8661 | return -EFAULT; | |
8662 | ||
8663 | /* arbitrary limit, but we need something */ | |
8664 | if (iov->iov_len > SZ_1G) | |
8665 | return -EFAULT; | |
8666 | ||
8667 | return 0; | |
8668 | } | |
8669 | ||
8670 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
8671 | unsigned int nr_args) | |
8672 | { | |
8673 | int i, ret; | |
8674 | struct iovec iov; | |
8675 | struct page *last_hpage = NULL; | |
8676 | ||
8677 | ret = io_buffers_map_alloc(ctx, nr_args); | |
8678 | if (ret) | |
8679 | return ret; | |
8680 | ||
edafccee JA |
8681 | for (i = 0; i < nr_args; i++) { |
8682 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
edafccee JA |
8683 | |
8684 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8685 | if (ret) | |
0a96bbe4 | 8686 | break; |
edafccee | 8687 | |
2b358604 BM |
8688 | ret = io_buffer_validate(&iov); |
8689 | if (ret) | |
0a96bbe4 | 8690 | break; |
edafccee | 8691 | |
0a96bbe4 BM |
8692 | ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage); |
8693 | if (ret) | |
8694 | break; | |
edafccee JA |
8695 | |
8696 | ctx->nr_user_bufs++; | |
8697 | } | |
0a96bbe4 BM |
8698 | |
8699 | if (ret) | |
8700 | io_sqe_buffers_unregister(ctx); | |
8701 | ||
edafccee JA |
8702 | return ret; |
8703 | } | |
8704 | ||
9b402849 JA |
8705 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8706 | { | |
8707 | __s32 __user *fds = arg; | |
8708 | int fd; | |
8709 | ||
8710 | if (ctx->cq_ev_fd) | |
8711 | return -EBUSY; | |
8712 | ||
8713 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8714 | return -EFAULT; | |
8715 | ||
8716 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8717 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8718 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8719 | ctx->cq_ev_fd = NULL; | |
8720 | return ret; | |
8721 | } | |
8722 | ||
8723 | return 0; | |
8724 | } | |
8725 | ||
8726 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8727 | { | |
8728 | if (ctx->cq_ev_fd) { | |
8729 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8730 | ctx->cq_ev_fd = NULL; | |
8731 | return 0; | |
8732 | } | |
8733 | ||
8734 | return -ENXIO; | |
8735 | } | |
8736 | ||
5a2e745d JA |
8737 | static int __io_destroy_buffers(int id, void *p, void *data) |
8738 | { | |
8739 | struct io_ring_ctx *ctx = data; | |
8740 | struct io_buffer *buf = p; | |
8741 | ||
067524e9 | 8742 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8743 | return 0; |
8744 | } | |
8745 | ||
8746 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8747 | { | |
8748 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8749 | idr_destroy(&ctx->io_buffer_idr); | |
8750 | } | |
8751 | ||
c7dae4ba | 8752 | static void io_req_cache_free(struct list_head *list) |
1b4c351f | 8753 | { |
c7dae4ba | 8754 | while (!list_empty(list)) { |
1b4c351f JA |
8755 | struct io_kiocb *req; |
8756 | ||
c7dae4ba | 8757 | req = list_first_entry(list, struct io_kiocb, compl.list); |
1b4c351f JA |
8758 | list_del(&req->compl.list); |
8759 | kmem_cache_free(req_cachep, req); | |
8760 | } | |
8761 | } | |
8762 | ||
2b188cc1 JA |
8763 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8764 | { | |
bf019da7 PB |
8765 | struct io_submit_state *submit_state = &ctx->submit_state; |
8766 | ||
6b06314c | 8767 | io_finish_async(ctx); |
0a96bbe4 | 8768 | io_sqe_buffers_unregister(ctx); |
2aede0e4 JA |
8769 | |
8770 | if (ctx->sqo_task) { | |
8771 | put_task_struct(ctx->sqo_task); | |
8772 | ctx->sqo_task = NULL; | |
8773 | mmdrop(ctx->mm_account); | |
8774 | ctx->mm_account = NULL; | |
30975825 | 8775 | } |
def596e9 | 8776 | |
bf019da7 PB |
8777 | if (submit_state->free_reqs) |
8778 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, | |
8779 | submit_state->reqs); | |
8780 | ||
91d8f519 DZ |
8781 | #ifdef CONFIG_BLK_CGROUP |
8782 | if (ctx->sqo_blkcg_css) | |
8783 | css_put(ctx->sqo_blkcg_css); | |
8784 | #endif | |
8785 | ||
6b06314c | 8786 | io_sqe_files_unregister(ctx); |
9b402849 | 8787 | io_eventfd_unregister(ctx); |
5a2e745d | 8788 | io_destroy_buffers(ctx); |
41726c9a | 8789 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8790 | |
2b188cc1 | 8791 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8792 | if (ctx->ring_sock) { |
8793 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8794 | sock_release(ctx->ring_sock); |
355e8d26 | 8795 | } |
2b188cc1 JA |
8796 | #endif |
8797 | ||
75b28aff | 8798 | io_mem_free(ctx->rings); |
2b188cc1 | 8799 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8800 | |
8801 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8802 | free_uid(ctx->user); |
181e448d | 8803 | put_cred(ctx->creds); |
78076bb6 | 8804 | kfree(ctx->cancel_hash); |
c7dae4ba JA |
8805 | io_req_cache_free(&ctx->submit_state.comp.free_list); |
8806 | io_req_cache_free(&ctx->submit_state.comp.locked_free_list); | |
2b188cc1 JA |
8807 | kfree(ctx); |
8808 | } | |
8809 | ||
8810 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8811 | { | |
8812 | struct io_ring_ctx *ctx = file->private_data; | |
8813 | __poll_t mask = 0; | |
8814 | ||
8815 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8816 | /* |
8817 | * synchronizes with barrier from wq_has_sleeper call in | |
8818 | * io_commit_cqring | |
8819 | */ | |
2b188cc1 | 8820 | smp_rmb(); |
90554200 | 8821 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8822 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8823 | |
8824 | /* | |
8825 | * Don't flush cqring overflow list here, just do a simple check. | |
8826 | * Otherwise there could possible be ABBA deadlock: | |
8827 | * CPU0 CPU1 | |
8828 | * ---- ---- | |
8829 | * lock(&ctx->uring_lock); | |
8830 | * lock(&ep->mtx); | |
8831 | * lock(&ctx->uring_lock); | |
8832 | * lock(&ep->mtx); | |
8833 | * | |
8834 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8835 | * pushs them to do the flush. | |
8836 | */ | |
8837 | if (io_cqring_events(ctx) || test_bit(0, &ctx->cq_check_overflow)) | |
2b188cc1 JA |
8838 | mask |= EPOLLIN | EPOLLRDNORM; |
8839 | ||
8840 | return mask; | |
8841 | } | |
8842 | ||
8843 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8844 | { | |
8845 | struct io_ring_ctx *ctx = file->private_data; | |
8846 | ||
8847 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8848 | } | |
8849 | ||
0bead8cd | 8850 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8851 | { |
1e6fa521 | 8852 | struct io_identity *iod; |
071698e1 | 8853 | |
1e6fa521 JA |
8854 | iod = idr_remove(&ctx->personality_idr, id); |
8855 | if (iod) { | |
8856 | put_cred(iod->creds); | |
8857 | if (refcount_dec_and_test(&iod->count)) | |
8858 | kfree(iod); | |
0bead8cd | 8859 | return 0; |
1e6fa521 | 8860 | } |
0bead8cd YD |
8861 | |
8862 | return -EINVAL; | |
8863 | } | |
8864 | ||
8865 | static int io_remove_personalities(int id, void *p, void *data) | |
8866 | { | |
8867 | struct io_ring_ctx *ctx = data; | |
8868 | ||
8869 | io_unregister_personality(ctx, id); | |
071698e1 JA |
8870 | return 0; |
8871 | } | |
8872 | ||
85faa7b8 JA |
8873 | static void io_ring_exit_work(struct work_struct *work) |
8874 | { | |
b2edc0a7 PB |
8875 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8876 | exit_work); | |
85faa7b8 | 8877 | |
56952e91 JA |
8878 | /* |
8879 | * If we're doing polled IO and end up having requests being | |
8880 | * submitted async (out-of-line), then completions can come in while | |
8881 | * we're waiting for refs to drop. We need to reap these manually, | |
8882 | * as nobody else will be looking for them. | |
8883 | */ | |
b2edc0a7 | 8884 | do { |
9936c7c2 | 8885 | io_uring_try_cancel_requests(ctx, NULL, NULL); |
b2edc0a7 | 8886 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
85faa7b8 JA |
8887 | io_ring_ctx_free(ctx); |
8888 | } | |
8889 | ||
00c18640 JA |
8890 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8891 | { | |
8892 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8893 | ||
8894 | return req->ctx == data; | |
8895 | } | |
8896 | ||
2b188cc1 JA |
8897 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8898 | { | |
8899 | mutex_lock(&ctx->uring_lock); | |
8900 | percpu_ref_kill(&ctx->refs); | |
d9d05217 PB |
8901 | |
8902 | if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead)) | |
8903 | ctx->sqo_dead = 1; | |
8904 | ||
cda286f0 PB |
8905 | /* if force is set, the ring is going away. always drop after that */ |
8906 | ctx->cq_overflow_flushed = 1; | |
634578f8 | 8907 | if (ctx->rings) |
6c503150 | 8908 | __io_cqring_overflow_flush(ctx, true, NULL, NULL); |
5c766a90 | 8909 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
2b188cc1 JA |
8910 | mutex_unlock(&ctx->uring_lock); |
8911 | ||
6b81928d PB |
8912 | io_kill_timeouts(ctx, NULL, NULL); |
8913 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8914 | |
8915 | if (ctx->io_wq) | |
00c18640 | 8916 | io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true); |
561fb04a | 8917 | |
15dff286 | 8918 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8919 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8920 | |
85faa7b8 | 8921 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8922 | /* |
8923 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8924 | * if we're exiting a ton of rings at the same time. It just adds | |
8925 | * noise and overhead, there's no discernable change in runtime | |
8926 | * over using system_wq. | |
8927 | */ | |
8928 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8929 | } |
8930 | ||
8931 | static int io_uring_release(struct inode *inode, struct file *file) | |
8932 | { | |
8933 | struct io_ring_ctx *ctx = file->private_data; | |
8934 | ||
8935 | file->private_data = NULL; | |
8936 | io_ring_ctx_wait_and_kill(ctx); | |
8937 | return 0; | |
8938 | } | |
8939 | ||
f6edbabb PB |
8940 | struct io_task_cancel { |
8941 | struct task_struct *task; | |
8942 | struct files_struct *files; | |
8943 | }; | |
f254ac04 | 8944 | |
f6edbabb | 8945 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8946 | { |
9a472ef7 | 8947 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8948 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8949 | bool ret; |
8950 | ||
f6edbabb | 8951 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8952 | unsigned long flags; |
8953 | struct io_ring_ctx *ctx = req->ctx; | |
8954 | ||
8955 | /* protect against races with linked timeouts */ | |
8956 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8957 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8958 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8959 | } else { | |
f6edbabb | 8960 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8961 | } |
8962 | return ret; | |
b711d4ea JA |
8963 | } |
8964 | ||
b7ddce3c | 8965 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8966 | struct task_struct *task, |
b7ddce3c PB |
8967 | struct files_struct *files) |
8968 | { | |
8969 | struct io_defer_entry *de = NULL; | |
8970 | LIST_HEAD(list); | |
8971 | ||
8972 | spin_lock_irq(&ctx->completion_lock); | |
8973 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8974 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8975 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8976 | break; | |
8977 | } | |
8978 | } | |
8979 | spin_unlock_irq(&ctx->completion_lock); | |
8980 | ||
8981 | while (!list_empty(&list)) { | |
8982 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8983 | list_del_init(&de->list); | |
8984 | req_set_fail_links(de->req); | |
8985 | io_put_req(de->req); | |
8986 | io_req_complete(de->req, -ECANCELED); | |
8987 | kfree(de); | |
8988 | } | |
8989 | } | |
8990 | ||
9936c7c2 PB |
8991 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
8992 | struct task_struct *task, | |
8993 | struct files_struct *files) | |
8994 | { | |
8995 | struct io_task_cancel cancel = { .task = task, .files = files, }; | |
8996 | ||
8997 | while (1) { | |
8998 | enum io_wq_cancel cret; | |
8999 | bool ret = false; | |
9000 | ||
9001 | if (ctx->io_wq) { | |
9002 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, | |
9003 | &cancel, true); | |
9004 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9005 | } | |
9006 | ||
9007 | /* SQPOLL thread does its own polling */ | |
9008 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && !files) { | |
9009 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
9010 | io_iopoll_try_reap_events(ctx); | |
9011 | ret = true; | |
9012 | } | |
9013 | } | |
9014 | ||
9015 | ret |= io_poll_remove_all(ctx, task, files); | |
9016 | ret |= io_kill_timeouts(ctx, task, files); | |
9017 | ret |= io_run_task_work(); | |
9018 | io_cqring_overflow_flush(ctx, true, task, files); | |
9019 | if (!ret) | |
9020 | break; | |
9021 | cond_resched(); | |
9022 | } | |
9023 | } | |
9024 | ||
ca70f00b PB |
9025 | static int io_uring_count_inflight(struct io_ring_ctx *ctx, |
9026 | struct task_struct *task, | |
9027 | struct files_struct *files) | |
9028 | { | |
9029 | struct io_kiocb *req; | |
9030 | int cnt = 0; | |
9031 | ||
9032 | spin_lock_irq(&ctx->inflight_lock); | |
9033 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) | |
9034 | cnt += io_match_task(req, task, files); | |
9035 | spin_unlock_irq(&ctx->inflight_lock); | |
9036 | return cnt; | |
9037 | } | |
9038 | ||
b52fda00 | 9039 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 9040 | struct task_struct *task, |
fcb323cc JA |
9041 | struct files_struct *files) |
9042 | { | |
fcb323cc | 9043 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 | 9044 | DEFINE_WAIT(wait); |
ca70f00b | 9045 | int inflight; |
fcb323cc | 9046 | |
ca70f00b PB |
9047 | inflight = io_uring_count_inflight(ctx, task, files); |
9048 | if (!inflight) | |
fcb323cc | 9049 | break; |
f6edbabb | 9050 | |
9936c7c2 | 9051 | io_uring_try_cancel_requests(ctx, task, files); |
34343786 PB |
9052 | |
9053 | if (ctx->sq_data) | |
9054 | io_sq_thread_unpark(ctx->sq_data); | |
ca70f00b PB |
9055 | prepare_to_wait(&task->io_uring->wait, &wait, |
9056 | TASK_UNINTERRUPTIBLE); | |
9057 | if (inflight == io_uring_count_inflight(ctx, task, files)) | |
9058 | schedule(); | |
c98de08c | 9059 | finish_wait(&task->io_uring->wait, &wait); |
34343786 PB |
9060 | if (ctx->sq_data) |
9061 | io_sq_thread_park(ctx->sq_data); | |
fcb323cc | 9062 | } |
44e728b8 PB |
9063 | } |
9064 | ||
d9d05217 PB |
9065 | static void io_disable_sqo_submit(struct io_ring_ctx *ctx) |
9066 | { | |
d9d05217 PB |
9067 | mutex_lock(&ctx->uring_lock); |
9068 | ctx->sqo_dead = 1; | |
9069 | mutex_unlock(&ctx->uring_lock); | |
9070 | ||
9071 | /* make sure callers enter the ring to get error */ | |
b4411616 PB |
9072 | if (ctx->rings) |
9073 | io_ring_set_wakeup_flag(ctx); | |
d9d05217 PB |
9074 | } |
9075 | ||
0f212204 JA |
9076 | /* |
9077 | * We need to iteratively cancel requests, in case a request has dependent | |
9078 | * hard links. These persist even for failure of cancelations, hence keep | |
9079 | * looping until none are found. | |
9080 | */ | |
9081 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
9082 | struct files_struct *files) | |
9083 | { | |
9084 | struct task_struct *task = current; | |
9085 | ||
fdaf083c | 9086 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
d9d05217 | 9087 | io_disable_sqo_submit(ctx); |
534ca6d6 | 9088 | task = ctx->sq_data->thread; |
fdaf083c JA |
9089 | atomic_inc(&task->io_uring->in_idle); |
9090 | io_sq_thread_park(ctx->sq_data); | |
9091 | } | |
0f212204 | 9092 | |
df9923f9 | 9093 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 9094 | |
3a7efd1a | 9095 | io_uring_cancel_files(ctx, task, files); |
b52fda00 | 9096 | if (!files) |
9936c7c2 | 9097 | io_uring_try_cancel_requests(ctx, task, NULL); |
fdaf083c JA |
9098 | |
9099 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
9100 | atomic_dec(&task->io_uring->in_idle); | |
9101 | /* | |
9102 | * If the files that are going away are the ones in the thread | |
9103 | * identity, clear them out. | |
9104 | */ | |
9105 | if (task->io_uring->identity->files == files) | |
9106 | task->io_uring->identity->files = NULL; | |
9107 | io_sq_thread_unpark(ctx->sq_data); | |
9108 | } | |
0f212204 JA |
9109 | } |
9110 | ||
9111 | /* | |
9112 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9113 | */ | |
fdaf083c | 9114 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 9115 | { |
236434c3 | 9116 | struct io_uring_task *tctx = current->io_uring; |
a528b04e | 9117 | int ret; |
236434c3 MWO |
9118 | |
9119 | if (unlikely(!tctx)) { | |
0f212204 JA |
9120 | ret = io_uring_alloc_task_context(current); |
9121 | if (unlikely(ret)) | |
9122 | return ret; | |
236434c3 | 9123 | tctx = current->io_uring; |
0f212204 | 9124 | } |
236434c3 MWO |
9125 | if (tctx->last != file) { |
9126 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 9127 | |
236434c3 | 9128 | if (!old) { |
0f212204 | 9129 | get_file(file); |
a528b04e PB |
9130 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)file, |
9131 | file, GFP_KERNEL)); | |
9132 | if (ret) { | |
9133 | fput(file); | |
9134 | return ret; | |
9135 | } | |
ecfc8492 PB |
9136 | |
9137 | /* one and only SQPOLL file note, held by sqo_task */ | |
9138 | WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && | |
9139 | current != ctx->sqo_task); | |
0f212204 | 9140 | } |
236434c3 | 9141 | tctx->last = file; |
0f212204 JA |
9142 | } |
9143 | ||
fdaf083c JA |
9144 | /* |
9145 | * This is race safe in that the task itself is doing this, hence it | |
9146 | * cannot be going through the exit/cancel paths at the same time. | |
9147 | * This cannot be modified while exit/cancel is running. | |
9148 | */ | |
9149 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
9150 | tctx->sqpoll = true; | |
9151 | ||
0f212204 JA |
9152 | return 0; |
9153 | } | |
9154 | ||
9155 | /* | |
9156 | * Remove this io_uring_file -> task mapping. | |
9157 | */ | |
9158 | static void io_uring_del_task_file(struct file *file) | |
9159 | { | |
9160 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
9161 | |
9162 | if (tctx->last == file) | |
9163 | tctx->last = NULL; | |
5e2ed8c4 | 9164 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
9165 | if (file) |
9166 | fput(file); | |
9167 | } | |
9168 | ||
de7f1d9e PB |
9169 | static void io_uring_remove_task_files(struct io_uring_task *tctx) |
9170 | { | |
9171 | struct file *file; | |
9172 | unsigned long index; | |
9173 | ||
9174 | xa_for_each(&tctx->xa, index, file) | |
9175 | io_uring_del_task_file(file); | |
9176 | } | |
9177 | ||
0f212204 JA |
9178 | void __io_uring_files_cancel(struct files_struct *files) |
9179 | { | |
9180 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
9181 | struct file *file; |
9182 | unsigned long index; | |
0f212204 JA |
9183 | |
9184 | /* make sure overflow events are dropped */ | |
fdaf083c | 9185 | atomic_inc(&tctx->in_idle); |
de7f1d9e PB |
9186 | xa_for_each(&tctx->xa, index, file) |
9187 | io_uring_cancel_task_requests(file->private_data, files); | |
fdaf083c | 9188 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9189 | |
9190 | if (files) | |
9191 | io_uring_remove_task_files(tctx); | |
fdaf083c JA |
9192 | } |
9193 | ||
9194 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
9195 | { | |
0e9ddb39 PB |
9196 | return percpu_counter_sum(&tctx->inflight); |
9197 | } | |
fdaf083c | 9198 | |
0e9ddb39 PB |
9199 | static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx) |
9200 | { | |
9201 | struct io_uring_task *tctx; | |
9202 | s64 inflight; | |
9203 | DEFINE_WAIT(wait); | |
fdaf083c | 9204 | |
0e9ddb39 PB |
9205 | if (!ctx->sq_data) |
9206 | return; | |
9207 | tctx = ctx->sq_data->thread->io_uring; | |
9208 | io_disable_sqo_submit(ctx); | |
fdaf083c | 9209 | |
0e9ddb39 PB |
9210 | atomic_inc(&tctx->in_idle); |
9211 | do { | |
9212 | /* read completions before cancelations */ | |
9213 | inflight = tctx_inflight(tctx); | |
9214 | if (!inflight) | |
9215 | break; | |
9216 | io_uring_cancel_task_requests(ctx, NULL); | |
fdaf083c | 9217 | |
0e9ddb39 PB |
9218 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
9219 | /* | |
9220 | * If we've seen completions, retry without waiting. This | |
9221 | * avoids a race where a completion comes in before we did | |
9222 | * prepare_to_wait(). | |
9223 | */ | |
9224 | if (inflight == tctx_inflight(tctx)) | |
9225 | schedule(); | |
9226 | finish_wait(&tctx->wait, &wait); | |
9227 | } while (1); | |
9228 | atomic_dec(&tctx->in_idle); | |
0f212204 JA |
9229 | } |
9230 | ||
0f212204 JA |
9231 | /* |
9232 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
9233 | * requests. | |
9234 | */ | |
9235 | void __io_uring_task_cancel(void) | |
9236 | { | |
9237 | struct io_uring_task *tctx = current->io_uring; | |
9238 | DEFINE_WAIT(wait); | |
d8a6df10 | 9239 | s64 inflight; |
0f212204 JA |
9240 | |
9241 | /* make sure overflow events are dropped */ | |
fdaf083c | 9242 | atomic_inc(&tctx->in_idle); |
0f212204 | 9243 | |
0b5cd6c3 | 9244 | /* trigger io_disable_sqo_submit() */ |
0e9ddb39 PB |
9245 | if (tctx->sqpoll) { |
9246 | struct file *file; | |
9247 | unsigned long index; | |
9248 | ||
9249 | xa_for_each(&tctx->xa, index, file) | |
9250 | io_uring_cancel_sqpoll(file->private_data); | |
9251 | } | |
0b5cd6c3 | 9252 | |
d8a6df10 | 9253 | do { |
0f212204 | 9254 | /* read completions before cancelations */ |
fdaf083c | 9255 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9256 | if (!inflight) |
9257 | break; | |
0f212204 JA |
9258 | __io_uring_files_cancel(NULL); |
9259 | ||
9260 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9261 | ||
9262 | /* | |
a1bb3cd5 PB |
9263 | * If we've seen completions, retry without waiting. This |
9264 | * avoids a race where a completion comes in before we did | |
9265 | * prepare_to_wait(). | |
0f212204 | 9266 | */ |
a1bb3cd5 PB |
9267 | if (inflight == tctx_inflight(tctx)) |
9268 | schedule(); | |
f57555ed | 9269 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9270 | } while (1); |
0f212204 | 9271 | |
fdaf083c | 9272 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9273 | |
9274 | io_uring_remove_task_files(tctx); | |
44e728b8 PB |
9275 | } |
9276 | ||
fcb323cc JA |
9277 | static int io_uring_flush(struct file *file, void *data) |
9278 | { | |
6b5733eb | 9279 | struct io_uring_task *tctx = current->io_uring; |
d9d05217 | 9280 | struct io_ring_ctx *ctx = file->private_data; |
6b5733eb | 9281 | |
84965ff8 JA |
9282 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
9283 | io_uring_cancel_task_requests(ctx, NULL); | |
9284 | ||
6b5733eb | 9285 | if (!tctx) |
4f793dc4 PB |
9286 | return 0; |
9287 | ||
6b5733eb PB |
9288 | /* we should have cancelled and erased it before PF_EXITING */ |
9289 | WARN_ON_ONCE((current->flags & PF_EXITING) && | |
9290 | xa_load(&tctx->xa, (unsigned long)file)); | |
9291 | ||
4f793dc4 PB |
9292 | /* |
9293 | * fput() is pending, will be 2 if the only other ref is our potential | |
9294 | * task file note. If the task is exiting, drop regardless of count. | |
9295 | */ | |
6b5733eb PB |
9296 | if (atomic_long_read(&file->f_count) != 2) |
9297 | return 0; | |
4f793dc4 | 9298 | |
d9d05217 PB |
9299 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
9300 | /* there is only one file note, which is owned by sqo_task */ | |
4325cb49 PB |
9301 | WARN_ON_ONCE(ctx->sqo_task != current && |
9302 | xa_load(&tctx->xa, (unsigned long)file)); | |
9303 | /* sqo_dead check is for when this happens after cancellation */ | |
9304 | WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead && | |
d9d05217 PB |
9305 | !xa_load(&tctx->xa, (unsigned long)file)); |
9306 | ||
9307 | io_disable_sqo_submit(ctx); | |
9308 | } | |
9309 | ||
9310 | if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current) | |
9311 | io_uring_del_task_file(file); | |
fcb323cc JA |
9312 | return 0; |
9313 | } | |
9314 | ||
6c5c240e RP |
9315 | static void *io_uring_validate_mmap_request(struct file *file, |
9316 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9317 | { |
2b188cc1 | 9318 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9319 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9320 | struct page *page; |
9321 | void *ptr; | |
9322 | ||
9323 | switch (offset) { | |
9324 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9325 | case IORING_OFF_CQ_RING: |
9326 | ptr = ctx->rings; | |
2b188cc1 JA |
9327 | break; |
9328 | case IORING_OFF_SQES: | |
9329 | ptr = ctx->sq_sqes; | |
9330 | break; | |
2b188cc1 | 9331 | default: |
6c5c240e | 9332 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9333 | } |
9334 | ||
9335 | page = virt_to_head_page(ptr); | |
a50b854e | 9336 | if (sz > page_size(page)) |
6c5c240e RP |
9337 | return ERR_PTR(-EINVAL); |
9338 | ||
9339 | return ptr; | |
9340 | } | |
9341 | ||
9342 | #ifdef CONFIG_MMU | |
9343 | ||
9344 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9345 | { | |
9346 | size_t sz = vma->vm_end - vma->vm_start; | |
9347 | unsigned long pfn; | |
9348 | void *ptr; | |
9349 | ||
9350 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9351 | if (IS_ERR(ptr)) | |
9352 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9353 | |
9354 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9355 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9356 | } | |
9357 | ||
6c5c240e RP |
9358 | #else /* !CONFIG_MMU */ |
9359 | ||
9360 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9361 | { | |
9362 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9363 | } | |
9364 | ||
9365 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9366 | { | |
9367 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9368 | } | |
9369 | ||
9370 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9371 | unsigned long addr, unsigned long len, | |
9372 | unsigned long pgoff, unsigned long flags) | |
9373 | { | |
9374 | void *ptr; | |
9375 | ||
9376 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9377 | if (IS_ERR(ptr)) | |
9378 | return PTR_ERR(ptr); | |
9379 | ||
9380 | return (unsigned long) ptr; | |
9381 | } | |
9382 | ||
9383 | #endif /* !CONFIG_MMU */ | |
9384 | ||
d9d05217 | 9385 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 | 9386 | { |
d9d05217 | 9387 | int ret = 0; |
90554200 JA |
9388 | DEFINE_WAIT(wait); |
9389 | ||
9390 | do { | |
9391 | if (!io_sqring_full(ctx)) | |
9392 | break; | |
9393 | ||
9394 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9395 | ||
d9d05217 PB |
9396 | if (unlikely(ctx->sqo_dead)) { |
9397 | ret = -EOWNERDEAD; | |
9398 | goto out; | |
9399 | } | |
9400 | ||
90554200 JA |
9401 | if (!io_sqring_full(ctx)) |
9402 | break; | |
9403 | ||
9404 | schedule(); | |
9405 | } while (!signal_pending(current)); | |
9406 | ||
9407 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
d9d05217 PB |
9408 | out: |
9409 | return ret; | |
90554200 JA |
9410 | } |
9411 | ||
c73ebb68 HX |
9412 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9413 | struct __kernel_timespec __user **ts, | |
9414 | const sigset_t __user **sig) | |
9415 | { | |
9416 | struct io_uring_getevents_arg arg; | |
9417 | ||
9418 | /* | |
9419 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9420 | * is just a pointer to the sigset_t. | |
9421 | */ | |
9422 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9423 | *sig = (const sigset_t __user *) argp; | |
9424 | *ts = NULL; | |
9425 | return 0; | |
9426 | } | |
9427 | ||
9428 | /* | |
9429 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9430 | * timespec and sigset_t pointers if good. | |
9431 | */ | |
9432 | if (*argsz != sizeof(arg)) | |
9433 | return -EINVAL; | |
9434 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9435 | return -EFAULT; | |
9436 | *sig = u64_to_user_ptr(arg.sigmask); | |
9437 | *argsz = arg.sigmask_sz; | |
9438 | *ts = u64_to_user_ptr(arg.ts); | |
9439 | return 0; | |
9440 | } | |
9441 | ||
2b188cc1 | 9442 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9443 | u32, min_complete, u32, flags, const void __user *, argp, |
9444 | size_t, argsz) | |
2b188cc1 JA |
9445 | { |
9446 | struct io_ring_ctx *ctx; | |
9447 | long ret = -EBADF; | |
9448 | int submitted = 0; | |
9449 | struct fd f; | |
9450 | ||
4c6e277c | 9451 | io_run_task_work(); |
b41e9852 | 9452 | |
90554200 | 9453 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9454 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9455 | return -EINVAL; |
9456 | ||
9457 | f = fdget(fd); | |
9458 | if (!f.file) | |
9459 | return -EBADF; | |
9460 | ||
9461 | ret = -EOPNOTSUPP; | |
9462 | if (f.file->f_op != &io_uring_fops) | |
9463 | goto out_fput; | |
9464 | ||
9465 | ret = -ENXIO; | |
9466 | ctx = f.file->private_data; | |
9467 | if (!percpu_ref_tryget(&ctx->refs)) | |
9468 | goto out_fput; | |
9469 | ||
7e84e1c7 SG |
9470 | ret = -EBADFD; |
9471 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9472 | goto out; | |
9473 | ||
6c271ce2 JA |
9474 | /* |
9475 | * For SQ polling, the thread will do all submissions and completions. | |
9476 | * Just return the requested submit count, and wake the thread if | |
9477 | * we were asked to. | |
9478 | */ | |
b2a9eada | 9479 | ret = 0; |
6c271ce2 | 9480 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c503150 | 9481 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
89448c47 | 9482 | |
d9d05217 PB |
9483 | ret = -EOWNERDEAD; |
9484 | if (unlikely(ctx->sqo_dead)) | |
9485 | goto out; | |
6c271ce2 | 9486 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9487 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9488 | if (flags & IORING_ENTER_SQ_WAIT) { |
9489 | ret = io_sqpoll_wait_sq(ctx); | |
9490 | if (ret) | |
9491 | goto out; | |
9492 | } | |
6c271ce2 | 9493 | submitted = to_submit; |
b2a9eada | 9494 | } else if (to_submit) { |
fdaf083c | 9495 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9496 | if (unlikely(ret)) |
9497 | goto out; | |
2b188cc1 | 9498 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9499 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9500 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9501 | |
9502 | if (submitted != to_submit) | |
9503 | goto out; | |
2b188cc1 JA |
9504 | } |
9505 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9506 | const sigset_t __user *sig; |
9507 | struct __kernel_timespec __user *ts; | |
9508 | ||
9509 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9510 | if (unlikely(ret)) | |
9511 | goto out; | |
9512 | ||
2b188cc1 JA |
9513 | min_complete = min(min_complete, ctx->cq_entries); |
9514 | ||
32b2244a XW |
9515 | /* |
9516 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9517 | * space applications don't need to do io completion events | |
9518 | * polling again, they can rely on io_sq_thread to do polling | |
9519 | * work, which can reduce cpu usage and uring_lock contention. | |
9520 | */ | |
9521 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9522 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9523 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9524 | } else { |
c73ebb68 | 9525 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9526 | } |
2b188cc1 JA |
9527 | } |
9528 | ||
7c504e65 | 9529 | out: |
6805b32e | 9530 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9531 | out_fput: |
9532 | fdput(f); | |
9533 | return submitted ? submitted : ret; | |
9534 | } | |
9535 | ||
bebdb65e | 9536 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9537 | static int io_uring_show_cred(int id, void *p, void *data) |
9538 | { | |
6b47ab81 JA |
9539 | struct io_identity *iod = p; |
9540 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9541 | struct seq_file *m = data; |
9542 | struct user_namespace *uns = seq_user_ns(m); | |
9543 | struct group_info *gi; | |
9544 | kernel_cap_t cap; | |
9545 | unsigned __capi; | |
9546 | int g; | |
9547 | ||
9548 | seq_printf(m, "%5d\n", id); | |
9549 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9550 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9551 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9552 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9553 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9554 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9555 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9556 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9557 | seq_puts(m, "\n\tGroups:\t"); | |
9558 | gi = cred->group_info; | |
9559 | for (g = 0; g < gi->ngroups; g++) { | |
9560 | seq_put_decimal_ull(m, g ? " " : "", | |
9561 | from_kgid_munged(uns, gi->gid[g])); | |
9562 | } | |
9563 | seq_puts(m, "\n\tCapEff:\t"); | |
9564 | cap = cred->cap_effective; | |
9565 | CAP_FOR_EACH_U32(__capi) | |
9566 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9567 | seq_putc(m, '\n'); | |
9568 | return 0; | |
9569 | } | |
9570 | ||
9571 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9572 | { | |
dbbe9c64 | 9573 | struct io_sq_data *sq = NULL; |
fad8e0de | 9574 | bool has_lock; |
87ce955b JA |
9575 | int i; |
9576 | ||
fad8e0de JA |
9577 | /* |
9578 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9579 | * since fdinfo case grabs it in the opposite direction of normal use | |
9580 | * cases. If we fail to get the lock, we just don't iterate any | |
9581 | * structures that could be going away outside the io_uring mutex. | |
9582 | */ | |
9583 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9584 | ||
dbbe9c64 JQ |
9585 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9586 | sq = ctx->sq_data; | |
9587 | ||
9588 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9589 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9590 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9591 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
ea64ec02 | 9592 | struct file *f = *io_fixed_file_slot(ctx->file_data, i); |
87ce955b | 9593 | |
87ce955b JA |
9594 | if (f) |
9595 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9596 | else | |
9597 | seq_printf(m, "%5u: <none>\n", i); | |
9598 | } | |
9599 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9600 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9601 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9602 | ||
9603 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9604 | (unsigned int) buf->len); | |
9605 | } | |
fad8e0de | 9606 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9607 | seq_printf(m, "Personalities:\n"); |
9608 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9609 | } | |
d7718a9d JA |
9610 | seq_printf(m, "PollList:\n"); |
9611 | spin_lock_irq(&ctx->completion_lock); | |
9612 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9613 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9614 | struct io_kiocb *req; | |
9615 | ||
9616 | hlist_for_each_entry(req, list, hash_node) | |
9617 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9618 | req->task->task_works != NULL); | |
9619 | } | |
9620 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9621 | if (has_lock) |
9622 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9623 | } |
9624 | ||
9625 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9626 | { | |
9627 | struct io_ring_ctx *ctx = f->private_data; | |
9628 | ||
9629 | if (percpu_ref_tryget(&ctx->refs)) { | |
9630 | __io_uring_show_fdinfo(ctx, m); | |
9631 | percpu_ref_put(&ctx->refs); | |
9632 | } | |
9633 | } | |
bebdb65e | 9634 | #endif |
87ce955b | 9635 | |
2b188cc1 JA |
9636 | static const struct file_operations io_uring_fops = { |
9637 | .release = io_uring_release, | |
fcb323cc | 9638 | .flush = io_uring_flush, |
2b188cc1 | 9639 | .mmap = io_uring_mmap, |
6c5c240e RP |
9640 | #ifndef CONFIG_MMU |
9641 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9642 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9643 | #endif | |
2b188cc1 JA |
9644 | .poll = io_uring_poll, |
9645 | .fasync = io_uring_fasync, | |
bebdb65e | 9646 | #ifdef CONFIG_PROC_FS |
87ce955b | 9647 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9648 | #endif |
2b188cc1 JA |
9649 | }; |
9650 | ||
9651 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9652 | struct io_uring_params *p) | |
9653 | { | |
75b28aff HV |
9654 | struct io_rings *rings; |
9655 | size_t size, sq_array_offset; | |
2b188cc1 | 9656 | |
bd740481 JA |
9657 | /* make sure these are sane, as we already accounted them */ |
9658 | ctx->sq_entries = p->sq_entries; | |
9659 | ctx->cq_entries = p->cq_entries; | |
9660 | ||
75b28aff HV |
9661 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9662 | if (size == SIZE_MAX) | |
9663 | return -EOVERFLOW; | |
9664 | ||
9665 | rings = io_mem_alloc(size); | |
9666 | if (!rings) | |
2b188cc1 JA |
9667 | return -ENOMEM; |
9668 | ||
75b28aff HV |
9669 | ctx->rings = rings; |
9670 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9671 | rings->sq_ring_mask = p->sq_entries - 1; | |
9672 | rings->cq_ring_mask = p->cq_entries - 1; | |
9673 | rings->sq_ring_entries = p->sq_entries; | |
9674 | rings->cq_ring_entries = p->cq_entries; | |
9675 | ctx->sq_mask = rings->sq_ring_mask; | |
9676 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9677 | |
9678 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9679 | if (size == SIZE_MAX) { |
9680 | io_mem_free(ctx->rings); | |
9681 | ctx->rings = NULL; | |
2b188cc1 | 9682 | return -EOVERFLOW; |
eb065d30 | 9683 | } |
2b188cc1 JA |
9684 | |
9685 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9686 | if (!ctx->sq_sqes) { |
9687 | io_mem_free(ctx->rings); | |
9688 | ctx->rings = NULL; | |
2b188cc1 | 9689 | return -ENOMEM; |
eb065d30 | 9690 | } |
2b188cc1 | 9691 | |
2b188cc1 JA |
9692 | return 0; |
9693 | } | |
9694 | ||
9faadcc8 PB |
9695 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9696 | { | |
9697 | int ret, fd; | |
9698 | ||
9699 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9700 | if (fd < 0) | |
9701 | return fd; | |
9702 | ||
9703 | ret = io_uring_add_task_file(ctx, file); | |
9704 | if (ret) { | |
9705 | put_unused_fd(fd); | |
9706 | return ret; | |
9707 | } | |
9708 | fd_install(fd, file); | |
9709 | return fd; | |
9710 | } | |
9711 | ||
2b188cc1 JA |
9712 | /* |
9713 | * Allocate an anonymous fd, this is what constitutes the application | |
9714 | * visible backing of an io_uring instance. The application mmaps this | |
9715 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9716 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9717 | */ | |
9faadcc8 | 9718 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9719 | { |
9720 | struct file *file; | |
9faadcc8 | 9721 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9722 | int ret; |
9723 | ||
2b188cc1 JA |
9724 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9725 | &ctx->ring_sock); | |
9726 | if (ret) | |
9faadcc8 | 9727 | return ERR_PTR(ret); |
2b188cc1 JA |
9728 | #endif |
9729 | ||
2b188cc1 JA |
9730 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9731 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9732 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9733 | if (IS_ERR(file)) { |
9734 | sock_release(ctx->ring_sock); | |
9735 | ctx->ring_sock = NULL; | |
9736 | } else { | |
9737 | ctx->ring_sock->file = file; | |
0f212204 | 9738 | } |
2b188cc1 | 9739 | #endif |
9faadcc8 | 9740 | return file; |
2b188cc1 JA |
9741 | } |
9742 | ||
7f13657d XW |
9743 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9744 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9745 | { |
9746 | struct user_struct *user = NULL; | |
9747 | struct io_ring_ctx *ctx; | |
9faadcc8 | 9748 | struct file *file; |
2b188cc1 JA |
9749 | int ret; |
9750 | ||
8110c1a6 | 9751 | if (!entries) |
2b188cc1 | 9752 | return -EINVAL; |
8110c1a6 JA |
9753 | if (entries > IORING_MAX_ENTRIES) { |
9754 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9755 | return -EINVAL; | |
9756 | entries = IORING_MAX_ENTRIES; | |
9757 | } | |
2b188cc1 JA |
9758 | |
9759 | /* | |
9760 | * Use twice as many entries for the CQ ring. It's possible for the | |
9761 | * application to drive a higher depth than the size of the SQ ring, | |
9762 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9763 | * some flexibility in overcommitting a bit. If the application has |
9764 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9765 | * of CQ ring entries manually. | |
2b188cc1 JA |
9766 | */ |
9767 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9768 | if (p->flags & IORING_SETUP_CQSIZE) { |
9769 | /* | |
9770 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9771 | * to a power-of-two, if it isn't already. We do NOT impose | |
9772 | * any cq vs sq ring sizing. | |
9773 | */ | |
eb2667b3 | 9774 | if (!p->cq_entries) |
33a107f0 | 9775 | return -EINVAL; |
8110c1a6 JA |
9776 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9777 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9778 | return -EINVAL; | |
9779 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9780 | } | |
eb2667b3 JQ |
9781 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9782 | if (p->cq_entries < p->sq_entries) | |
9783 | return -EINVAL; | |
33a107f0 JA |
9784 | } else { |
9785 | p->cq_entries = 2 * p->sq_entries; | |
9786 | } | |
2b188cc1 JA |
9787 | |
9788 | user = get_uid(current_user()); | |
2b188cc1 JA |
9789 | |
9790 | ctx = io_ring_ctx_alloc(p); | |
9791 | if (!ctx) { | |
2b188cc1 JA |
9792 | free_uid(user); |
9793 | return -ENOMEM; | |
9794 | } | |
9795 | ctx->compat = in_compat_syscall(); | |
26bfa89e | 9796 | ctx->limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9797 | ctx->user = user; |
0b8c0ec7 | 9798 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9799 | #ifdef CONFIG_AUDIT |
9800 | ctx->loginuid = current->loginuid; | |
9801 | ctx->sessionid = current->sessionid; | |
9802 | #endif | |
2aede0e4 JA |
9803 | ctx->sqo_task = get_task_struct(current); |
9804 | ||
9805 | /* | |
9806 | * This is just grabbed for accounting purposes. When a process exits, | |
9807 | * the mm is exited and dropped before the files, hence we need to hang | |
9808 | * on to this mm purely for the purposes of being able to unaccount | |
9809 | * memory (locked/pinned vm). It's not used for anything else. | |
9810 | */ | |
6b7898eb | 9811 | mmgrab(current->mm); |
2aede0e4 | 9812 | ctx->mm_account = current->mm; |
6b7898eb | 9813 | |
91d8f519 DZ |
9814 | #ifdef CONFIG_BLK_CGROUP |
9815 | /* | |
9816 | * The sq thread will belong to the original cgroup it was inited in. | |
9817 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9818 | * issued bios will be associated with the closest cgroup later in the | |
9819 | * block layer. | |
9820 | */ | |
9821 | rcu_read_lock(); | |
9822 | ctx->sqo_blkcg_css = blkcg_css(); | |
9823 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9824 | rcu_read_unlock(); | |
9825 | if (!ret) { | |
9826 | /* don't init against a dying cgroup, have the user try again */ | |
9827 | ctx->sqo_blkcg_css = NULL; | |
9828 | ret = -ENODEV; | |
9829 | goto err; | |
9830 | } | |
9831 | #endif | |
2b188cc1 JA |
9832 | ret = io_allocate_scq_urings(ctx, p); |
9833 | if (ret) | |
9834 | goto err; | |
9835 | ||
7e84e1c7 | 9836 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9837 | if (ret) |
9838 | goto err; | |
9839 | ||
7e84e1c7 SG |
9840 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9841 | io_sq_offload_start(ctx); | |
9842 | ||
2b188cc1 | 9843 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9844 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9845 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9846 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9847 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9848 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9849 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9850 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9851 | |
9852 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9853 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9854 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9855 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9856 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9857 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9858 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9859 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9860 | |
7f13657d XW |
9861 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9862 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9863 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9864 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9865 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9866 | |
9867 | if (copy_to_user(params, p, sizeof(*p))) { | |
9868 | ret = -EFAULT; | |
9869 | goto err; | |
9870 | } | |
d1719f70 | 9871 | |
9faadcc8 PB |
9872 | file = io_uring_get_file(ctx); |
9873 | if (IS_ERR(file)) { | |
9874 | ret = PTR_ERR(file); | |
9875 | goto err; | |
9876 | } | |
9877 | ||
044c1ab3 JA |
9878 | /* |
9879 | * Install ring fd as the very last thing, so we don't risk someone | |
9880 | * having closed it before we finish setup | |
9881 | */ | |
9faadcc8 PB |
9882 | ret = io_uring_install_fd(ctx, file); |
9883 | if (ret < 0) { | |
06585c49 | 9884 | io_disable_sqo_submit(ctx); |
9faadcc8 PB |
9885 | /* fput will clean it up */ |
9886 | fput(file); | |
9887 | return ret; | |
9888 | } | |
044c1ab3 | 9889 | |
c826bd7a | 9890 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9891 | return ret; |
9892 | err: | |
d9d05217 | 9893 | io_disable_sqo_submit(ctx); |
2b188cc1 JA |
9894 | io_ring_ctx_wait_and_kill(ctx); |
9895 | return ret; | |
9896 | } | |
9897 | ||
9898 | /* | |
9899 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9900 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9901 | * params structure passed in. | |
9902 | */ | |
9903 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9904 | { | |
9905 | struct io_uring_params p; | |
2b188cc1 JA |
9906 | int i; |
9907 | ||
9908 | if (copy_from_user(&p, params, sizeof(p))) | |
9909 | return -EFAULT; | |
9910 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9911 | if (p.resv[i]) | |
9912 | return -EINVAL; | |
9913 | } | |
9914 | ||
6c271ce2 | 9915 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9916 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9917 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9918 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9919 | return -EINVAL; |
9920 | ||
7f13657d | 9921 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9922 | } |
9923 | ||
9924 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9925 | struct io_uring_params __user *, params) | |
9926 | { | |
9927 | return io_uring_setup(entries, params); | |
9928 | } | |
9929 | ||
66f4af93 JA |
9930 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9931 | { | |
9932 | struct io_uring_probe *p; | |
9933 | size_t size; | |
9934 | int i, ret; | |
9935 | ||
9936 | size = struct_size(p, ops, nr_args); | |
9937 | if (size == SIZE_MAX) | |
9938 | return -EOVERFLOW; | |
9939 | p = kzalloc(size, GFP_KERNEL); | |
9940 | if (!p) | |
9941 | return -ENOMEM; | |
9942 | ||
9943 | ret = -EFAULT; | |
9944 | if (copy_from_user(p, arg, size)) | |
9945 | goto out; | |
9946 | ret = -EINVAL; | |
9947 | if (memchr_inv(p, 0, size)) | |
9948 | goto out; | |
9949 | ||
9950 | p->last_op = IORING_OP_LAST - 1; | |
9951 | if (nr_args > IORING_OP_LAST) | |
9952 | nr_args = IORING_OP_LAST; | |
9953 | ||
9954 | for (i = 0; i < nr_args; i++) { | |
9955 | p->ops[i].op = i; | |
9956 | if (!io_op_defs[i].not_supported) | |
9957 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9958 | } | |
9959 | p->ops_len = i; | |
9960 | ||
9961 | ret = 0; | |
9962 | if (copy_to_user(arg, p, size)) | |
9963 | ret = -EFAULT; | |
9964 | out: | |
9965 | kfree(p); | |
9966 | return ret; | |
9967 | } | |
9968 | ||
071698e1 JA |
9969 | static int io_register_personality(struct io_ring_ctx *ctx) |
9970 | { | |
1e6fa521 JA |
9971 | struct io_identity *id; |
9972 | int ret; | |
071698e1 | 9973 | |
1e6fa521 JA |
9974 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9975 | if (unlikely(!id)) | |
9976 | return -ENOMEM; | |
9977 | ||
9978 | io_init_identity(id); | |
9979 | id->creds = get_current_cred(); | |
9980 | ||
9981 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9982 | if (ret < 0) { | |
9983 | put_cred(id->creds); | |
9984 | kfree(id); | |
9985 | } | |
9986 | return ret; | |
071698e1 JA |
9987 | } |
9988 | ||
21b55dbc SG |
9989 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9990 | unsigned int nr_args) | |
9991 | { | |
9992 | struct io_uring_restriction *res; | |
9993 | size_t size; | |
9994 | int i, ret; | |
9995 | ||
7e84e1c7 SG |
9996 | /* Restrictions allowed only if rings started disabled */ |
9997 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9998 | return -EBADFD; | |
9999 | ||
21b55dbc | 10000 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10001 | if (ctx->restrictions.registered) |
21b55dbc SG |
10002 | return -EBUSY; |
10003 | ||
10004 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10005 | return -EINVAL; | |
10006 | ||
10007 | size = array_size(nr_args, sizeof(*res)); | |
10008 | if (size == SIZE_MAX) | |
10009 | return -EOVERFLOW; | |
10010 | ||
10011 | res = memdup_user(arg, size); | |
10012 | if (IS_ERR(res)) | |
10013 | return PTR_ERR(res); | |
10014 | ||
10015 | ret = 0; | |
10016 | ||
10017 | for (i = 0; i < nr_args; i++) { | |
10018 | switch (res[i].opcode) { | |
10019 | case IORING_RESTRICTION_REGISTER_OP: | |
10020 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10021 | ret = -EINVAL; | |
10022 | goto out; | |
10023 | } | |
10024 | ||
10025 | __set_bit(res[i].register_op, | |
10026 | ctx->restrictions.register_op); | |
10027 | break; | |
10028 | case IORING_RESTRICTION_SQE_OP: | |
10029 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10030 | ret = -EINVAL; | |
10031 | goto out; | |
10032 | } | |
10033 | ||
10034 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10035 | break; | |
10036 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10037 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10038 | break; | |
10039 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10040 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10041 | break; | |
10042 | default: | |
10043 | ret = -EINVAL; | |
10044 | goto out; | |
10045 | } | |
10046 | } | |
10047 | ||
10048 | out: | |
10049 | /* Reset all restrictions if an error happened */ | |
10050 | if (ret != 0) | |
10051 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10052 | else | |
7e84e1c7 | 10053 | ctx->restrictions.registered = true; |
21b55dbc SG |
10054 | |
10055 | kfree(res); | |
10056 | return ret; | |
10057 | } | |
10058 | ||
7e84e1c7 SG |
10059 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10060 | { | |
10061 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10062 | return -EBADFD; | |
10063 | ||
10064 | if (ctx->restrictions.registered) | |
10065 | ctx->restricted = 1; | |
10066 | ||
10067 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
10068 | ||
10069 | io_sq_offload_start(ctx); | |
10070 | ||
10071 | return 0; | |
10072 | } | |
10073 | ||
071698e1 JA |
10074 | static bool io_register_op_must_quiesce(int op) |
10075 | { | |
10076 | switch (op) { | |
10077 | case IORING_UNREGISTER_FILES: | |
10078 | case IORING_REGISTER_FILES_UPDATE: | |
10079 | case IORING_REGISTER_PROBE: | |
10080 | case IORING_REGISTER_PERSONALITY: | |
10081 | case IORING_UNREGISTER_PERSONALITY: | |
10082 | return false; | |
10083 | default: | |
10084 | return true; | |
10085 | } | |
10086 | } | |
10087 | ||
edafccee JA |
10088 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10089 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10090 | __releases(ctx->uring_lock) |
10091 | __acquires(ctx->uring_lock) | |
edafccee JA |
10092 | { |
10093 | int ret; | |
10094 | ||
35fa71a0 JA |
10095 | /* |
10096 | * We're inside the ring mutex, if the ref is already dying, then | |
10097 | * someone else killed the ctx or is already going through | |
10098 | * io_uring_register(). | |
10099 | */ | |
10100 | if (percpu_ref_is_dying(&ctx->refs)) | |
10101 | return -ENXIO; | |
10102 | ||
071698e1 | 10103 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10104 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 10105 | |
05f3fb3c JA |
10106 | /* |
10107 | * Drop uring mutex before waiting for references to exit. If | |
10108 | * another thread is currently inside io_uring_enter() it might | |
10109 | * need to grab the uring_lock to make progress. If we hold it | |
10110 | * here across the drain wait, then we can deadlock. It's safe | |
10111 | * to drop the mutex here, since no new references will come in | |
10112 | * after we've killed the percpu ref. | |
10113 | */ | |
10114 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
10115 | do { |
10116 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10117 | if (!ret) | |
10118 | break; | |
ed6930c9 JA |
10119 | ret = io_run_task_work_sig(); |
10120 | if (ret < 0) | |
10121 | break; | |
af9c1a44 JA |
10122 | } while (1); |
10123 | ||
05f3fb3c | 10124 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 10125 | |
c150368b JA |
10126 | if (ret) { |
10127 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
10128 | goto out_quiesce; |
10129 | } | |
10130 | } | |
10131 | ||
10132 | if (ctx->restricted) { | |
10133 | if (opcode >= IORING_REGISTER_LAST) { | |
10134 | ret = -EINVAL; | |
10135 | goto out; | |
10136 | } | |
10137 | ||
10138 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
10139 | ret = -EACCES; | |
c150368b JA |
10140 | goto out; |
10141 | } | |
05f3fb3c | 10142 | } |
edafccee JA |
10143 | |
10144 | switch (opcode) { | |
10145 | case IORING_REGISTER_BUFFERS: | |
0a96bbe4 | 10146 | ret = io_sqe_buffers_register(ctx, arg, nr_args); |
edafccee JA |
10147 | break; |
10148 | case IORING_UNREGISTER_BUFFERS: | |
10149 | ret = -EINVAL; | |
10150 | if (arg || nr_args) | |
10151 | break; | |
0a96bbe4 | 10152 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10153 | break; |
6b06314c JA |
10154 | case IORING_REGISTER_FILES: |
10155 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
10156 | break; | |
10157 | case IORING_UNREGISTER_FILES: | |
10158 | ret = -EINVAL; | |
10159 | if (arg || nr_args) | |
10160 | break; | |
10161 | ret = io_sqe_files_unregister(ctx); | |
10162 | break; | |
c3a31e60 JA |
10163 | case IORING_REGISTER_FILES_UPDATE: |
10164 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
10165 | break; | |
9b402849 | 10166 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10167 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10168 | ret = -EINVAL; |
10169 | if (nr_args != 1) | |
10170 | break; | |
10171 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10172 | if (ret) |
10173 | break; | |
10174 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10175 | ctx->eventfd_async = 1; | |
10176 | else | |
10177 | ctx->eventfd_async = 0; | |
9b402849 JA |
10178 | break; |
10179 | case IORING_UNREGISTER_EVENTFD: | |
10180 | ret = -EINVAL; | |
10181 | if (arg || nr_args) | |
10182 | break; | |
10183 | ret = io_eventfd_unregister(ctx); | |
10184 | break; | |
66f4af93 JA |
10185 | case IORING_REGISTER_PROBE: |
10186 | ret = -EINVAL; | |
10187 | if (!arg || nr_args > 256) | |
10188 | break; | |
10189 | ret = io_probe(ctx, arg, nr_args); | |
10190 | break; | |
071698e1 JA |
10191 | case IORING_REGISTER_PERSONALITY: |
10192 | ret = -EINVAL; | |
10193 | if (arg || nr_args) | |
10194 | break; | |
10195 | ret = io_register_personality(ctx); | |
10196 | break; | |
10197 | case IORING_UNREGISTER_PERSONALITY: | |
10198 | ret = -EINVAL; | |
10199 | if (arg) | |
10200 | break; | |
10201 | ret = io_unregister_personality(ctx, nr_args); | |
10202 | break; | |
7e84e1c7 SG |
10203 | case IORING_REGISTER_ENABLE_RINGS: |
10204 | ret = -EINVAL; | |
10205 | if (arg || nr_args) | |
10206 | break; | |
10207 | ret = io_register_enable_rings(ctx); | |
10208 | break; | |
21b55dbc SG |
10209 | case IORING_REGISTER_RESTRICTIONS: |
10210 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10211 | break; | |
edafccee JA |
10212 | default: |
10213 | ret = -EINVAL; | |
10214 | break; | |
10215 | } | |
10216 | ||
21b55dbc | 10217 | out: |
071698e1 | 10218 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10219 | /* bring the ctx back to life */ |
05f3fb3c | 10220 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 10221 | out_quiesce: |
0f158b4c | 10222 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10223 | } |
edafccee JA |
10224 | return ret; |
10225 | } | |
10226 | ||
10227 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10228 | void __user *, arg, unsigned int, nr_args) | |
10229 | { | |
10230 | struct io_ring_ctx *ctx; | |
10231 | long ret = -EBADF; | |
10232 | struct fd f; | |
10233 | ||
10234 | f = fdget(fd); | |
10235 | if (!f.file) | |
10236 | return -EBADF; | |
10237 | ||
10238 | ret = -EOPNOTSUPP; | |
10239 | if (f.file->f_op != &io_uring_fops) | |
10240 | goto out_fput; | |
10241 | ||
10242 | ctx = f.file->private_data; | |
10243 | ||
10244 | mutex_lock(&ctx->uring_lock); | |
10245 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10246 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10247 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10248 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10249 | out_fput: |
10250 | fdput(f); | |
10251 | return ret; | |
10252 | } | |
10253 | ||
2b188cc1 JA |
10254 | static int __init io_uring_init(void) |
10255 | { | |
d7f62e82 SM |
10256 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10257 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10258 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10259 | } while (0) | |
10260 | ||
10261 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10262 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10263 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10264 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10265 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10266 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10267 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10268 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10269 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10270 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10271 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10272 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10273 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10274 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10275 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10276 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10277 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10278 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10279 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10280 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10281 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10282 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10283 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10284 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10285 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10286 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10287 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10288 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10289 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
10290 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 10291 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10292 | |
d3656344 | 10293 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10294 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
91f245d5 JA |
10295 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10296 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10297 | return 0; |
10298 | }; | |
10299 | __initcall(io_uring_init); |