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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 | |
23faba36 | 1032 | static bool io_rw_reissue(struct io_kiocb *req); |
78e19bbe | 1033 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 1034 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1035 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 1036 | static void io_double_put_req(struct io_kiocb *req); |
c7dae4ba JA |
1037 | static void io_dismantle_req(struct io_kiocb *req); |
1038 | static void io_put_task(struct task_struct *task, int nr); | |
1039 | static void io_queue_next(struct io_kiocb *req); | |
94ae5e77 | 1040 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 1041 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 1042 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c | 1043 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 1044 | struct io_uring_rsrc_update *ip, |
05f3fb3c | 1045 | unsigned nr_args); |
3ca405eb | 1046 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1047 | static struct file *io_file_get(struct io_submit_state *state, |
1048 | struct io_kiocb *req, int fd, bool fixed); | |
c5eef2b9 | 1049 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1050 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1051 | |
847595de PB |
1052 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
1053 | struct iov_iter *iter, bool needs_lock); | |
ff6165b2 JA |
1054 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1055 | const struct iovec *fast_iov, | |
227c0c96 | 1056 | struct iov_iter *iter, bool force); |
907d1df3 | 1057 | static void io_req_task_queue(struct io_kiocb *req); |
65453d1e JA |
1058 | static void io_submit_flush_completions(struct io_comp_state *cs, |
1059 | struct io_ring_ctx *ctx); | |
de0617e4 | 1060 | |
2b188cc1 JA |
1061 | static struct kmem_cache *req_cachep; |
1062 | ||
0918682b | 1063 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1064 | |
1065 | struct sock *io_uring_get_socket(struct file *file) | |
1066 | { | |
1067 | #if defined(CONFIG_UNIX) | |
1068 | if (file->f_op == &io_uring_fops) { | |
1069 | struct io_ring_ctx *ctx = file->private_data; | |
1070 | ||
1071 | return ctx->ring_sock->sk; | |
1072 | } | |
1073 | #endif | |
1074 | return NULL; | |
1075 | } | |
1076 | EXPORT_SYMBOL(io_uring_get_socket); | |
1077 | ||
f2f87370 PB |
1078 | #define io_for_each_link(pos, head) \ |
1079 | for (pos = (head); pos; pos = pos->link) | |
1080 | ||
3ca405eb PB |
1081 | static inline void io_clean_op(struct io_kiocb *req) |
1082 | { | |
9d5c8190 | 1083 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
3ca405eb PB |
1084 | __io_clean_op(req); |
1085 | } | |
1086 | ||
36f72fe2 PB |
1087 | static inline void io_set_resource_node(struct io_kiocb *req) |
1088 | { | |
1089 | struct io_ring_ctx *ctx = req->ctx; | |
1090 | ||
269bbe5f BM |
1091 | if (!req->fixed_rsrc_refs) { |
1092 | req->fixed_rsrc_refs = &ctx->file_data->node->refs; | |
1093 | percpu_ref_get(req->fixed_rsrc_refs); | |
36f72fe2 PB |
1094 | } |
1095 | } | |
1096 | ||
08d23634 PB |
1097 | static bool io_match_task(struct io_kiocb *head, |
1098 | struct task_struct *task, | |
1099 | struct files_struct *files) | |
1100 | { | |
1101 | struct io_kiocb *req; | |
1102 | ||
84965ff8 JA |
1103 | if (task && head->task != task) { |
1104 | /* in terms of cancelation, always match if req task is dead */ | |
1105 | if (head->task->flags & PF_EXITING) | |
1106 | return true; | |
08d23634 | 1107 | return false; |
84965ff8 | 1108 | } |
08d23634 PB |
1109 | if (!files) |
1110 | return true; | |
1111 | ||
1112 | io_for_each_link(req, head) { | |
02a13674 JA |
1113 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1114 | continue; | |
1115 | if (req->file && req->file->f_op == &io_uring_fops) | |
1116 | return true; | |
1117 | if ((req->work.flags & IO_WQ_WORK_FILES) && | |
08d23634 PB |
1118 | req->work.identity->files == files) |
1119 | return true; | |
1120 | } | |
1121 | return false; | |
1122 | } | |
1123 | ||
28cea78a | 1124 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1125 | { |
28cea78a | 1126 | struct files_struct *files = current->files; |
c40f6379 JA |
1127 | struct mm_struct *mm = current->mm; |
1128 | ||
1129 | if (mm) { | |
1130 | kthread_unuse_mm(mm); | |
1131 | mmput(mm); | |
4b70cf9d | 1132 | current->mm = NULL; |
c40f6379 | 1133 | } |
28cea78a JA |
1134 | if (files) { |
1135 | struct nsproxy *nsproxy = current->nsproxy; | |
1136 | ||
1137 | task_lock(current); | |
1138 | current->files = NULL; | |
1139 | current->nsproxy = NULL; | |
1140 | task_unlock(current); | |
1141 | put_files_struct(files); | |
1142 | put_nsproxy(nsproxy); | |
1143 | } | |
1144 | } | |
1145 | ||
1a38ffc9 | 1146 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a JA |
1147 | { |
1148 | if (!current->files) { | |
1149 | struct files_struct *files; | |
1150 | struct nsproxy *nsproxy; | |
1151 | ||
1152 | task_lock(ctx->sqo_task); | |
1153 | files = ctx->sqo_task->files; | |
1154 | if (!files) { | |
1155 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1156 | return -EOWNERDEAD; |
28cea78a JA |
1157 | } |
1158 | atomic_inc(&files->count); | |
1159 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1160 | nsproxy = ctx->sqo_task->nsproxy; | |
1161 | task_unlock(ctx->sqo_task); | |
1162 | ||
1163 | task_lock(current); | |
1164 | current->files = files; | |
1165 | current->nsproxy = nsproxy; | |
1166 | task_unlock(current); | |
1167 | } | |
1a38ffc9 | 1168 | return 0; |
c40f6379 JA |
1169 | } |
1170 | ||
1171 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1172 | { | |
4b70cf9d JA |
1173 | struct mm_struct *mm; |
1174 | ||
1175 | if (current->mm) | |
1176 | return 0; | |
1177 | ||
4b70cf9d JA |
1178 | task_lock(ctx->sqo_task); |
1179 | mm = ctx->sqo_task->mm; | |
1180 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1181 | mm = NULL; | |
1182 | task_unlock(ctx->sqo_task); | |
1183 | ||
1184 | if (mm) { | |
1185 | kthread_use_mm(mm); | |
1186 | return 0; | |
c40f6379 JA |
1187 | } |
1188 | ||
4b70cf9d | 1189 | return -EFAULT; |
c40f6379 JA |
1190 | } |
1191 | ||
4e326358 PB |
1192 | static int __io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1193 | struct io_kiocb *req) | |
c40f6379 | 1194 | { |
28cea78a | 1195 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1196 | int ret; |
28cea78a JA |
1197 | |
1198 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1199 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1200 | if (unlikely(ret)) |
1201 | return ret; | |
1202 | } | |
1203 | ||
1a38ffc9 PB |
1204 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1205 | ret = __io_sq_thread_acquire_files(ctx); | |
1206 | if (unlikely(ret)) | |
1207 | return ret; | |
1208 | } | |
28cea78a JA |
1209 | |
1210 | return 0; | |
c40f6379 JA |
1211 | } |
1212 | ||
4e326358 PB |
1213 | static inline int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1214 | struct io_kiocb *req) | |
1215 | { | |
4e326358 PB |
1216 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) |
1217 | return 0; | |
1218 | return __io_sq_thread_acquire_mm_files(ctx, req); | |
1219 | } | |
1220 | ||
91d8f519 DZ |
1221 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1222 | struct cgroup_subsys_state **cur_css) | |
1223 | ||
1224 | { | |
1225 | #ifdef CONFIG_BLK_CGROUP | |
1226 | /* puts the old one when swapping */ | |
1227 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1228 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1229 | *cur_css = ctx->sqo_blkcg_css; | |
1230 | } | |
1231 | #endif | |
1232 | } | |
1233 | ||
1234 | static void io_sq_thread_unassociate_blkcg(void) | |
1235 | { | |
1236 | #ifdef CONFIG_BLK_CGROUP | |
1237 | kthread_associate_blkcg(NULL); | |
1238 | #endif | |
1239 | } | |
1240 | ||
c40f6379 JA |
1241 | static inline void req_set_fail_links(struct io_kiocb *req) |
1242 | { | |
1243 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1244 | req->flags |= REQ_F_FAIL_LINK; | |
1245 | } | |
4a38aed2 | 1246 | |
1e6fa521 JA |
1247 | /* |
1248 | * None of these are dereferenced, they are simply used to check if any of | |
1249 | * them have changed. If we're under current and check they are still the | |
1250 | * same, we're fine to grab references to them for actual out-of-line use. | |
1251 | */ | |
1252 | static void io_init_identity(struct io_identity *id) | |
1253 | { | |
1254 | id->files = current->files; | |
1255 | id->mm = current->mm; | |
1256 | #ifdef CONFIG_BLK_CGROUP | |
1257 | rcu_read_lock(); | |
1258 | id->blkcg_css = blkcg_css(); | |
1259 | rcu_read_unlock(); | |
1260 | #endif | |
1261 | id->creds = current_cred(); | |
1262 | id->nsproxy = current->nsproxy; | |
1263 | id->fs = current->fs; | |
1264 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1265 | #ifdef CONFIG_AUDIT |
1266 | id->loginuid = current->loginuid; | |
1267 | id->sessionid = current->sessionid; | |
1268 | #endif | |
1e6fa521 JA |
1269 | refcount_set(&id->count, 1); |
1270 | } | |
1271 | ||
ec99ca6c PB |
1272 | static inline void __io_req_init_async(struct io_kiocb *req) |
1273 | { | |
1274 | memset(&req->work, 0, sizeof(req->work)); | |
1275 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1276 | } | |
1277 | ||
7cdaf587 XW |
1278 | /* |
1279 | * Note: must call io_req_init_async() for the first time you | |
1280 | * touch any members of io_wq_work. | |
1281 | */ | |
1282 | static inline void io_req_init_async(struct io_kiocb *req) | |
1283 | { | |
500a373d JA |
1284 | struct io_uring_task *tctx = current->io_uring; |
1285 | ||
7cdaf587 XW |
1286 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1287 | return; | |
1288 | ||
ec99ca6c | 1289 | __io_req_init_async(req); |
500a373d JA |
1290 | |
1291 | /* Grab a ref if this isn't our static identity */ | |
1292 | req->work.identity = tctx->identity; | |
1293 | if (tctx->identity != &tctx->__identity) | |
1294 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1295 | } |
1296 | ||
2b188cc1 JA |
1297 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1298 | { | |
1299 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1300 | ||
0f158b4c | 1301 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1302 | } |
1303 | ||
8eb7e2d0 PB |
1304 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1305 | { | |
1306 | return !req->timeout.off; | |
1307 | } | |
1308 | ||
2b188cc1 JA |
1309 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1310 | { | |
1311 | struct io_ring_ctx *ctx; | |
78076bb6 | 1312 | int hash_bits; |
2b188cc1 JA |
1313 | |
1314 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1315 | if (!ctx) | |
1316 | return NULL; | |
1317 | ||
78076bb6 JA |
1318 | /* |
1319 | * Use 5 bits less than the max cq entries, that should give us around | |
1320 | * 32 entries per hash list if totally full and uniformly spread. | |
1321 | */ | |
1322 | hash_bits = ilog2(p->cq_entries); | |
1323 | hash_bits -= 5; | |
1324 | if (hash_bits <= 0) | |
1325 | hash_bits = 1; | |
1326 | ctx->cancel_hash_bits = hash_bits; | |
1327 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1328 | GFP_KERNEL); | |
1329 | if (!ctx->cancel_hash) | |
1330 | goto err; | |
1331 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1332 | ||
21482896 | 1333 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1334 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1335 | goto err; | |
2b188cc1 JA |
1336 | |
1337 | ctx->flags = p->flags; | |
90554200 | 1338 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1339 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1340 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1341 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1342 | init_completion(&ctx->ref_comp); |
1343 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1344 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1345 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1346 | mutex_init(&ctx->uring_lock); |
1347 | init_waitqueue_head(&ctx->wait); | |
1348 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1349 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1350 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1351 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1352 | spin_lock_init(&ctx->inflight_lock); |
1353 | INIT_LIST_HEAD(&ctx->inflight_list); | |
d67d2263 BM |
1354 | spin_lock_init(&ctx->rsrc_ref_lock); |
1355 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1356 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1357 | init_llist_head(&ctx->rsrc_put_llist); | |
1b4c351f | 1358 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
c7dae4ba | 1359 | INIT_LIST_HEAD(&ctx->submit_state.comp.locked_free_list); |
2b188cc1 | 1360 | return ctx; |
206aefde | 1361 | err: |
78076bb6 | 1362 | kfree(ctx->cancel_hash); |
206aefde JA |
1363 | kfree(ctx); |
1364 | return NULL; | |
2b188cc1 JA |
1365 | } |
1366 | ||
9cf7c104 | 1367 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1368 | { |
2bc9930e JA |
1369 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1370 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1371 | |
9cf7c104 | 1372 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1373 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1374 | } |
de0617e4 | 1375 | |
9d858b21 | 1376 | return false; |
de0617e4 JA |
1377 | } |
1378 | ||
5c3462cf | 1379 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1380 | { |
500a373d | 1381 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1382 | return; |
1383 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1384 | kfree(req->work.identity); | |
1385 | } | |
1386 | ||
4edf20f9 | 1387 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1388 | { |
7cdaf587 | 1389 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1390 | return; |
51a4cc11 | 1391 | |
e86d0047 | 1392 | if (req->work.flags & IO_WQ_WORK_MM) |
98447d65 | 1393 | mmdrop(req->work.identity->mm); |
91d8f519 | 1394 | #ifdef CONFIG_BLK_CGROUP |
e86d0047 | 1395 | if (req->work.flags & IO_WQ_WORK_BLKCG) |
98447d65 | 1396 | css_put(req->work.identity->blkcg_css); |
91d8f519 | 1397 | #endif |
e86d0047 | 1398 | if (req->work.flags & IO_WQ_WORK_CREDS) |
98447d65 | 1399 | put_cred(req->work.identity->creds); |
dfead8a8 | 1400 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1401 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1402 | |
98447d65 | 1403 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1404 | if (--fs->users) |
1405 | fs = NULL; | |
98447d65 | 1406 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1407 | if (fs) |
1408 | free_fs_struct(fs); | |
1409 | } | |
34e08fed PB |
1410 | if (req->work.flags & IO_WQ_WORK_FILES) { |
1411 | put_files_struct(req->work.identity->files); | |
1412 | put_nsproxy(req->work.identity->nsproxy); | |
34e08fed PB |
1413 | } |
1414 | if (req->flags & REQ_F_INFLIGHT) { | |
1415 | struct io_ring_ctx *ctx = req->ctx; | |
1416 | struct io_uring_task *tctx = req->task->io_uring; | |
1417 | unsigned long flags; | |
1418 | ||
1419 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1420 | list_del(&req->inflight_entry); | |
1421 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1422 | req->flags &= ~REQ_F_INFLIGHT; | |
1423 | if (atomic_read(&tctx->in_idle)) | |
1424 | wake_up(&tctx->wait); | |
1425 | } | |
51a4cc11 | 1426 | |
e86d0047 PB |
1427 | req->flags &= ~REQ_F_WORK_INITIALIZED; |
1428 | req->work.flags &= ~(IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | IO_WQ_WORK_FS | | |
1429 | IO_WQ_WORK_CREDS | IO_WQ_WORK_FILES); | |
5c3462cf | 1430 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1431 | } |
1432 | ||
1e6fa521 JA |
1433 | /* |
1434 | * Create a private copy of io_identity, since some fields don't match | |
1435 | * the current context. | |
1436 | */ | |
1437 | static bool io_identity_cow(struct io_kiocb *req) | |
1438 | { | |
5c3462cf | 1439 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1440 | const struct cred *creds = NULL; |
1441 | struct io_identity *id; | |
1442 | ||
1443 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1444 | creds = req->work.identity->creds; | |
1445 | ||
1446 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1447 | if (unlikely(!id)) { | |
1448 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1449 | return false; | |
1450 | } | |
1451 | ||
1452 | /* | |
1453 | * We can safely just re-init the creds we copied Either the field | |
1454 | * matches the current one, or we haven't grabbed it yet. The only | |
1455 | * exception is ->creds, through registered personalities, so handle | |
1456 | * that one separately. | |
1457 | */ | |
1458 | io_init_identity(id); | |
1459 | if (creds) | |
e8c954df | 1460 | id->creds = creds; |
1e6fa521 JA |
1461 | |
1462 | /* add one for this request */ | |
1463 | refcount_inc(&id->count); | |
1464 | ||
cb8a8ae3 JA |
1465 | /* drop tctx and req identity references, if needed */ |
1466 | if (tctx->identity != &tctx->__identity && | |
1467 | refcount_dec_and_test(&tctx->identity->count)) | |
1468 | kfree(tctx->identity); | |
1469 | if (req->work.identity != &tctx->__identity && | |
1470 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1471 | kfree(req->work.identity); |
1472 | ||
1473 | req->work.identity = id; | |
500a373d | 1474 | tctx->identity = id; |
1e6fa521 JA |
1475 | return true; |
1476 | } | |
1477 | ||
ce3d5aae PB |
1478 | static void io_req_track_inflight(struct io_kiocb *req) |
1479 | { | |
1480 | struct io_ring_ctx *ctx = req->ctx; | |
1481 | ||
1482 | if (!(req->flags & REQ_F_INFLIGHT)) { | |
1483 | io_req_init_async(req); | |
1484 | req->flags |= REQ_F_INFLIGHT; | |
1485 | ||
1486 | spin_lock_irq(&ctx->inflight_lock); | |
1487 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1488 | spin_unlock_irq(&ctx->inflight_lock); | |
1489 | } | |
1490 | } | |
1491 | ||
1e6fa521 | 1492 | static bool io_grab_identity(struct io_kiocb *req) |
18d9be1a | 1493 | { |
d3656344 | 1494 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1495 | struct io_identity *id = req->work.identity; |
54a91f3b | 1496 | |
69228338 JA |
1497 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1498 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1499 | return false; | |
1500 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1501 | } | |
91d8f519 | 1502 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1503 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1504 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1505 | rcu_read_lock(); |
1e6fa521 JA |
1506 | if (id->blkcg_css != blkcg_css()) { |
1507 | rcu_read_unlock(); | |
1508 | return false; | |
1509 | } | |
91d8f519 DZ |
1510 | /* |
1511 | * This should be rare, either the cgroup is dying or the task | |
1512 | * is moving cgroups. Just punt to root for the handful of ios. | |
1513 | */ | |
1e6fa521 | 1514 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1515 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1516 | rcu_read_unlock(); |
1517 | } | |
1518 | #endif | |
dfead8a8 | 1519 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1520 | if (id->creds != current_cred()) |
1521 | return false; | |
1522 | get_cred(id->creds); | |
dfead8a8 JA |
1523 | req->work.flags |= IO_WQ_WORK_CREDS; |
1524 | } | |
4ea33a97 JA |
1525 | #ifdef CONFIG_AUDIT |
1526 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1527 | current->sessionid != id->sessionid) | |
1528 | return false; | |
1529 | #endif | |
dfead8a8 JA |
1530 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1531 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1532 | if (current->fs != id->fs) |
1533 | return false; | |
1534 | spin_lock(&id->fs->lock); | |
1535 | if (!id->fs->in_exec) { | |
1536 | id->fs->users++; | |
dfead8a8 | 1537 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1538 | } else { |
1539 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1540 | } | |
1541 | spin_unlock(¤t->fs->lock); | |
1542 | } | |
af604703 PB |
1543 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1544 | (def->work_flags & IO_WQ_WORK_FILES) && | |
1545 | !(req->flags & REQ_F_NO_FILE_TABLE)) { | |
1546 | if (id->files != current->files || | |
1547 | id->nsproxy != current->nsproxy) | |
1548 | return false; | |
1549 | atomic_inc(&id->files->count); | |
1550 | get_nsproxy(id->nsproxy); | |
af604703 | 1551 | req->work.flags |= IO_WQ_WORK_FILES; |
ce3d5aae | 1552 | io_req_track_inflight(req); |
af604703 | 1553 | } |
77788775 JA |
1554 | if (!(req->work.flags & IO_WQ_WORK_MM) && |
1555 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1556 | if (id->mm != current->mm) | |
1557 | return false; | |
1558 | mmgrab(id->mm); | |
1559 | req->work.flags |= IO_WQ_WORK_MM; | |
1560 | } | |
1e6fa521 JA |
1561 | |
1562 | return true; | |
1563 | } | |
1564 | ||
1565 | static void io_prep_async_work(struct io_kiocb *req) | |
1566 | { | |
1567 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1568 | struct io_ring_ctx *ctx = req->ctx; |
1569 | ||
1570 | io_req_init_async(req); | |
1571 | ||
feaadc4f PB |
1572 | if (req->flags & REQ_F_FORCE_ASYNC) |
1573 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1574 | ||
1e6fa521 JA |
1575 | if (req->flags & REQ_F_ISREG) { |
1576 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1577 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1578 | } else { | |
1579 | if (def->unbound_nonreg_file) | |
1580 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1581 | } | |
1582 | ||
1e6fa521 JA |
1583 | /* if we fail grabbing identity, we must COW, regrab, and retry */ |
1584 | if (io_grab_identity(req)) | |
1585 | return; | |
1586 | ||
1587 | if (!io_identity_cow(req)) | |
1588 | return; | |
1589 | ||
1590 | /* can't fail at this point */ | |
1591 | if (!io_grab_identity(req)) | |
1592 | WARN_ON(1); | |
561fb04a | 1593 | } |
cccf0ee8 | 1594 | |
cbdcb435 | 1595 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1596 | { |
cbdcb435 | 1597 | struct io_kiocb *cur; |
54a91f3b | 1598 | |
f2f87370 PB |
1599 | io_for_each_link(cur, req) |
1600 | io_prep_async_work(cur); | |
561fb04a JA |
1601 | } |
1602 | ||
7271ef3a | 1603 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1604 | { |
a197f664 | 1605 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1606 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1607 | |
8766dd51 PB |
1608 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1609 | &req->work, req->flags); | |
1610 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1611 | return link; |
18d9be1a JA |
1612 | } |
1613 | ||
cbdcb435 PB |
1614 | static void io_queue_async_work(struct io_kiocb *req) |
1615 | { | |
7271ef3a JA |
1616 | struct io_kiocb *link; |
1617 | ||
cbdcb435 PB |
1618 | /* init ->work of the whole link before punting */ |
1619 | io_prep_async_link(req); | |
7271ef3a JA |
1620 | link = __io_queue_async_work(req); |
1621 | ||
1622 | if (link) | |
1623 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1624 | } |
1625 | ||
5262f567 JA |
1626 | static void io_kill_timeout(struct io_kiocb *req) |
1627 | { | |
e8c2bc1f | 1628 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1629 | int ret; |
1630 | ||
e8c2bc1f | 1631 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1632 | if (ret != -1) { |
01cec8c1 PB |
1633 | atomic_set(&req->ctx->cq_timeouts, |
1634 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1635 | list_del_init(&req->timeout.list); |
78e19bbe | 1636 | io_cqring_fill_event(req, 0); |
216578e5 | 1637 | io_put_req_deferred(req, 1); |
5262f567 JA |
1638 | } |
1639 | } | |
1640 | ||
76e1b642 JA |
1641 | /* |
1642 | * Returns true if we found and killed one or more timeouts | |
1643 | */ | |
6b81928d PB |
1644 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1645 | struct files_struct *files) | |
5262f567 JA |
1646 | { |
1647 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1648 | int canceled = 0; |
5262f567 JA |
1649 | |
1650 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1651 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1652 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1653 | io_kill_timeout(req); |
76e1b642 JA |
1654 | canceled++; |
1655 | } | |
f3606e3a | 1656 | } |
5262f567 | 1657 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1658 | return canceled != 0; |
5262f567 JA |
1659 | } |
1660 | ||
04518945 | 1661 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1662 | { |
04518945 | 1663 | do { |
27dc8338 PB |
1664 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1665 | struct io_defer_entry, list); | |
de0617e4 | 1666 | |
9cf7c104 | 1667 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1668 | break; |
27dc8338 | 1669 | list_del_init(&de->list); |
907d1df3 | 1670 | io_req_task_queue(de->req); |
27dc8338 | 1671 | kfree(de); |
04518945 PB |
1672 | } while (!list_empty(&ctx->defer_list)); |
1673 | } | |
1674 | ||
360428f8 | 1675 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1676 | { |
f010505b MDG |
1677 | u32 seq; |
1678 | ||
1679 | if (list_empty(&ctx->timeout_list)) | |
1680 | return; | |
1681 | ||
1682 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
1683 | ||
1684 | do { | |
1685 | u32 events_needed, events_got; | |
360428f8 | 1686 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1687 | struct io_kiocb, timeout.list); |
de0617e4 | 1688 | |
8eb7e2d0 | 1689 | if (io_is_timeout_noseq(req)) |
360428f8 | 1690 | break; |
f010505b MDG |
1691 | |
1692 | /* | |
1693 | * Since seq can easily wrap around over time, subtract | |
1694 | * the last seq at which timeouts were flushed before comparing. | |
1695 | * Assuming not more than 2^31-1 events have happened since, | |
1696 | * these subtractions won't have wrapped, so we can check if | |
1697 | * target is in [last_seq, current_seq] by comparing the two. | |
1698 | */ | |
1699 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1700 | events_got = seq - ctx->cq_last_tm_flush; | |
1701 | if (events_got < events_needed) | |
360428f8 | 1702 | break; |
bfe68a22 | 1703 | |
135fcde8 | 1704 | list_del_init(&req->timeout.list); |
5262f567 | 1705 | io_kill_timeout(req); |
f010505b MDG |
1706 | } while (!list_empty(&ctx->timeout_list)); |
1707 | ||
1708 | ctx->cq_last_tm_flush = seq; | |
360428f8 | 1709 | } |
5262f567 | 1710 | |
360428f8 PB |
1711 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1712 | { | |
1713 | io_flush_timeouts(ctx); | |
ec30e04b PB |
1714 | |
1715 | /* order cqe stores with ring update */ | |
1716 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 | 1717 | |
04518945 PB |
1718 | if (unlikely(!list_empty(&ctx->defer_list))) |
1719 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1720 | } |
1721 | ||
90554200 JA |
1722 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1723 | { | |
1724 | struct io_rings *r = ctx->rings; | |
1725 | ||
1726 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1727 | } | |
1728 | ||
888aae2e PB |
1729 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1730 | { | |
1731 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1732 | } | |
1733 | ||
2b188cc1 JA |
1734 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1735 | { | |
75b28aff | 1736 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1737 | unsigned tail; |
1738 | ||
115e12e5 SB |
1739 | /* |
1740 | * writes to the cq entry need to come after reading head; the | |
1741 | * control dependency is enough as we're using WRITE_ONCE to | |
1742 | * fill the cq entry | |
1743 | */ | |
888aae2e | 1744 | if (__io_cqring_events(ctx) == rings->cq_ring_entries) |
2b188cc1 JA |
1745 | return NULL; |
1746 | ||
888aae2e | 1747 | tail = ctx->cached_cq_tail++; |
75b28aff | 1748 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1749 | } |
1750 | ||
f2842ab5 JA |
1751 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1752 | { | |
f0b493e6 JA |
1753 | if (!ctx->cq_ev_fd) |
1754 | return false; | |
7e55a19c SG |
1755 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1756 | return false; | |
f2842ab5 JA |
1757 | if (!ctx->eventfd_async) |
1758 | return true; | |
b41e9852 | 1759 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1760 | } |
1761 | ||
b41e9852 | 1762 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1763 | { |
b1445e59 PB |
1764 | /* see waitqueue_active() comment */ |
1765 | smp_mb(); | |
1766 | ||
1d7bb1d5 JA |
1767 | if (waitqueue_active(&ctx->wait)) |
1768 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1769 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1770 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1771 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1772 | eventfd_signal(ctx->cq_ev_fd, 1); |
b1445e59 | 1773 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1774 | wake_up_interruptible(&ctx->cq_wait); |
1775 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1776 | } | |
1d7bb1d5 JA |
1777 | } |
1778 | ||
80c18e4a PB |
1779 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1780 | { | |
b1445e59 PB |
1781 | /* see waitqueue_active() comment */ |
1782 | smp_mb(); | |
1783 | ||
80c18e4a PB |
1784 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1785 | if (waitqueue_active(&ctx->wait)) | |
1786 | wake_up(&ctx->wait); | |
1787 | } | |
1788 | if (io_should_trigger_evfd(ctx)) | |
1789 | eventfd_signal(ctx->cq_ev_fd, 1); | |
b1445e59 | 1790 | if (waitqueue_active(&ctx->cq_wait)) { |
4aa84f2f PB |
1791 | wake_up_interruptible(&ctx->cq_wait); |
1792 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
1793 | } | |
80c18e4a PB |
1794 | } |
1795 | ||
c4a2ed72 | 1796 | /* Returns true if there are no backlogged entries after the flush */ |
6c503150 PB |
1797 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1798 | struct task_struct *tsk, | |
1799 | struct files_struct *files) | |
1d7bb1d5 JA |
1800 | { |
1801 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1802 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1803 | struct io_uring_cqe *cqe; |
1d7bb1d5 | 1804 | unsigned long flags; |
b18032bb | 1805 | bool all_flushed, posted; |
1d7bb1d5 JA |
1806 | LIST_HEAD(list); |
1807 | ||
e23de15f PB |
1808 | if (!force && __io_cqring_events(ctx) == rings->cq_ring_entries) |
1809 | return false; | |
1d7bb1d5 | 1810 | |
b18032bb | 1811 | posted = false; |
1d7bb1d5 | 1812 | spin_lock_irqsave(&ctx->completion_lock, flags); |
e6c8aa9a | 1813 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1814 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1815 | continue; |
1816 | ||
1d7bb1d5 JA |
1817 | cqe = io_get_cqring(ctx); |
1818 | if (!cqe && !force) | |
1819 | break; | |
1820 | ||
40d8ddd4 | 1821 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1822 | if (cqe) { |
1823 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1824 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1825 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1826 | } else { |
2c3bac6d | 1827 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1828 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1829 | ctx->cached_cq_overflow); |
1d7bb1d5 | 1830 | } |
b18032bb | 1831 | posted = true; |
1d7bb1d5 JA |
1832 | } |
1833 | ||
09e88404 PB |
1834 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1835 | if (all_flushed) { | |
1836 | clear_bit(0, &ctx->sq_check_overflow); | |
1837 | clear_bit(0, &ctx->cq_check_overflow); | |
1838 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1839 | } | |
46930143 | 1840 | |
b18032bb JA |
1841 | if (posted) |
1842 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1843 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1844 | if (posted) |
1845 | io_cqring_ev_posted(ctx); | |
1d7bb1d5 JA |
1846 | |
1847 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1848 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1849 | list_del(&req->compl.list); | |
ec9c02ad | 1850 | io_put_req(req); |
1d7bb1d5 | 1851 | } |
c4a2ed72 | 1852 | |
09e88404 | 1853 | return all_flushed; |
1d7bb1d5 JA |
1854 | } |
1855 | ||
6c503150 PB |
1856 | static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1857 | struct task_struct *tsk, | |
1858 | struct files_struct *files) | |
1859 | { | |
1860 | if (test_bit(0, &ctx->cq_check_overflow)) { | |
1861 | /* iopoll syncs against uring_lock, not completion_lock */ | |
1862 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1863 | mutex_lock(&ctx->uring_lock); | |
1864 | __io_cqring_overflow_flush(ctx, force, tsk, files); | |
1865 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1866 | mutex_unlock(&ctx->uring_lock); | |
1867 | } | |
1868 | } | |
1869 | ||
bcda7baa | 1870 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1871 | { |
78e19bbe | 1872 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1873 | struct io_uring_cqe *cqe; |
1874 | ||
78e19bbe | 1875 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1876 | |
2b188cc1 JA |
1877 | /* |
1878 | * If we can't get a cq entry, userspace overflowed the | |
1879 | * submission (by quite a lot). Increment the overflow count in | |
1880 | * the ring. | |
1881 | */ | |
1882 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1883 | if (likely(cqe)) { |
78e19bbe | 1884 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1885 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1886 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1887 | } else if (ctx->cq_overflow_flushed || |
1888 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1889 | /* |
1890 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1891 | * then we cannot store the request for later flushing, we need | |
1892 | * to drop it on the floor. | |
1893 | */ | |
2c3bac6d PB |
1894 | ctx->cached_cq_overflow++; |
1895 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1896 | } else { |
ad3eb2c8 JA |
1897 | if (list_empty(&ctx->cq_overflow_list)) { |
1898 | set_bit(0, &ctx->sq_check_overflow); | |
1899 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1900 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1901 | } |
40d8ddd4 | 1902 | io_clean_op(req); |
1d7bb1d5 | 1903 | req->result = res; |
0f7e466b | 1904 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1905 | refcount_inc(&req->refs); |
1906 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1907 | } |
1908 | } | |
1909 | ||
bcda7baa JA |
1910 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1911 | { | |
1912 | __io_cqring_fill_event(req, res, 0); | |
1913 | } | |
1914 | ||
c7dae4ba JA |
1915 | static inline void io_req_complete_post(struct io_kiocb *req, long res, |
1916 | unsigned int cflags) | |
2b188cc1 | 1917 | { |
78e19bbe | 1918 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1919 | unsigned long flags; |
1920 | ||
1921 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1922 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 | 1923 | io_commit_cqring(ctx); |
c7dae4ba JA |
1924 | /* |
1925 | * If we're the last reference to this request, add to our locked | |
1926 | * free_list cache. | |
1927 | */ | |
1928 | if (refcount_dec_and_test(&req->refs)) { | |
1929 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
1930 | ||
1931 | io_dismantle_req(req); | |
1932 | io_put_task(req->task, 1); | |
1933 | list_add(&req->compl.list, &cs->locked_free_list); | |
1934 | cs->locked_free_nr++; | |
1935 | } else | |
1936 | req = NULL; | |
2b188cc1 JA |
1937 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1938 | ||
8c838788 | 1939 | io_cqring_ev_posted(ctx); |
c7dae4ba JA |
1940 | if (req) { |
1941 | io_queue_next(req); | |
1942 | percpu_ref_put(&ctx->refs); | |
1943 | } | |
2b188cc1 JA |
1944 | } |
1945 | ||
a38d68db | 1946 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1947 | unsigned int cflags) |
229a7b63 | 1948 | { |
a38d68db PB |
1949 | io_clean_op(req); |
1950 | req->result = res; | |
1951 | req->compl.cflags = cflags; | |
e342c807 | 1952 | req->flags |= REQ_F_COMPLETE_INLINE; |
a38d68db PB |
1953 | } |
1954 | ||
889fca73 PB |
1955 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1956 | long res, unsigned cflags) | |
a38d68db | 1957 | { |
889fca73 PB |
1958 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1959 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1960 | else |
c7dae4ba | 1961 | io_req_complete_post(req, res, cflags); |
e1e16097 JA |
1962 | } |
1963 | ||
a38d68db | 1964 | static inline void io_req_complete(struct io_kiocb *req, long res) |
bcda7baa | 1965 | { |
889fca73 | 1966 | __io_req_complete(req, 0, res, 0); |
bcda7baa JA |
1967 | } |
1968 | ||
c7dae4ba | 1969 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
2b188cc1 | 1970 | { |
c7dae4ba JA |
1971 | struct io_submit_state *state = &ctx->submit_state; |
1972 | struct io_comp_state *cs = &state->comp; | |
e5d1bc0a | 1973 | struct io_kiocb *req = NULL; |
1b4c351f | 1974 | |
c7dae4ba JA |
1975 | /* |
1976 | * If we have more than a batch's worth of requests in our IRQ side | |
1977 | * locked cache, grab the lock and move them over to our submission | |
1978 | * side cache. | |
1979 | */ | |
1980 | if (READ_ONCE(cs->locked_free_nr) > IO_COMPL_BATCH) { | |
1981 | spin_lock_irq(&ctx->completion_lock); | |
1982 | list_splice_init(&cs->locked_free_list, &cs->free_list); | |
1983 | cs->locked_free_nr = 0; | |
1984 | spin_unlock_irq(&ctx->completion_lock); | |
1985 | } | |
1986 | ||
1987 | while (!list_empty(&cs->free_list)) { | |
1988 | req = list_first_entry(&cs->free_list, struct io_kiocb, | |
1b4c351f JA |
1989 | compl.list); |
1990 | list_del(&req->compl.list); | |
e5d1bc0a PB |
1991 | state->reqs[state->free_reqs++] = req; |
1992 | if (state->free_reqs == ARRAY_SIZE(state->reqs)) | |
1993 | break; | |
1b4c351f JA |
1994 | } |
1995 | ||
e5d1bc0a PB |
1996 | return req != NULL; |
1997 | } | |
1998 | ||
1999 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2000 | { | |
2001 | struct io_submit_state *state = &ctx->submit_state; | |
2002 | ||
2003 | BUILD_BUG_ON(IO_REQ_ALLOC_BATCH > ARRAY_SIZE(state->reqs)); | |
2004 | ||
f6b6c7d6 | 2005 | if (!state->free_reqs) { |
291b2821 | 2006 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
2007 | int ret; |
2008 | ||
c7dae4ba | 2009 | if (io_flush_cached_reqs(ctx)) |
e5d1bc0a PB |
2010 | goto got_req; |
2011 | ||
bf019da7 PB |
2012 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
2013 | state->reqs); | |
fd6fab2c JA |
2014 | |
2015 | /* | |
2016 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2017 | * retry single alloc to be on the safe side. | |
2018 | */ | |
2019 | if (unlikely(ret <= 0)) { | |
2020 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
2021 | if (!state->reqs[0]) | |
3893f39f | 2022 | return NULL; |
fd6fab2c JA |
2023 | ret = 1; |
2024 | } | |
291b2821 | 2025 | state->free_reqs = ret; |
2b188cc1 | 2026 | } |
e5d1bc0a | 2027 | got_req: |
291b2821 PB |
2028 | state->free_reqs--; |
2029 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
2030 | } |
2031 | ||
8da11c19 PB |
2032 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
2033 | bool fixed) | |
2034 | { | |
36f72fe2 | 2035 | if (!fixed) |
8da11c19 PB |
2036 | fput(file); |
2037 | } | |
2038 | ||
4edf20f9 | 2039 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2040 | { |
3ca405eb | 2041 | io_clean_op(req); |
929a3af9 | 2042 | |
e8c2bc1f JA |
2043 | if (req->async_data) |
2044 | kfree(req->async_data); | |
8da11c19 PB |
2045 | if (req->file) |
2046 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
269bbe5f BM |
2047 | if (req->fixed_rsrc_refs) |
2048 | percpu_ref_put(req->fixed_rsrc_refs); | |
4edf20f9 | 2049 | io_req_clean_work(req); |
e65ef56d JA |
2050 | } |
2051 | ||
7c660731 PB |
2052 | static inline void io_put_task(struct task_struct *task, int nr) |
2053 | { | |
2054 | struct io_uring_task *tctx = task->io_uring; | |
2055 | ||
2056 | percpu_counter_sub(&tctx->inflight, nr); | |
2057 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2058 | wake_up(&tctx->wait); | |
2059 | put_task_struct_many(task, nr); | |
2060 | } | |
2061 | ||
216578e5 | 2062 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2063 | { |
51a4cc11 | 2064 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2065 | |
216578e5 | 2066 | io_dismantle_req(req); |
7c660731 | 2067 | io_put_task(req->task, 1); |
e3bc8e9d | 2068 | |
3893f39f | 2069 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 2070 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
2071 | } |
2072 | ||
f2f87370 PB |
2073 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2074 | { | |
2075 | struct io_kiocb *nxt = req->link; | |
2076 | ||
2077 | req->link = nxt->link; | |
2078 | nxt->link = NULL; | |
2079 | } | |
2080 | ||
c9abd7ad | 2081 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 2082 | { |
a197f664 | 2083 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 2084 | struct io_kiocb *link; |
c9abd7ad PB |
2085 | bool cancelled = false; |
2086 | unsigned long flags; | |
7c86ffee | 2087 | |
c9abd7ad | 2088 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2089 | link = req->link; |
2090 | ||
900fad45 PB |
2091 | /* |
2092 | * Can happen if a linked timeout fired and link had been like | |
2093 | * req -> link t-out -> link t-out [-> ...] | |
2094 | */ | |
c9abd7ad PB |
2095 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
2096 | struct io_timeout_data *io = link->async_data; | |
2097 | int ret; | |
7c86ffee | 2098 | |
f2f87370 | 2099 | io_remove_next_linked(req); |
90cd7e42 | 2100 | link->timeout.head = NULL; |
c9abd7ad PB |
2101 | ret = hrtimer_try_to_cancel(&io->timer); |
2102 | if (ret != -1) { | |
2103 | io_cqring_fill_event(link, -ECANCELED); | |
2104 | io_commit_cqring(ctx); | |
2105 | cancelled = true; | |
2106 | } | |
2107 | } | |
7c86ffee | 2108 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 2109 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 2110 | |
c9abd7ad | 2111 | if (cancelled) { |
7c86ffee | 2112 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2113 | io_put_req(link); |
2114 | } | |
7c86ffee PB |
2115 | } |
2116 | ||
9e645e11 | 2117 | |
d148ca4b | 2118 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2119 | { |
f2f87370 | 2120 | struct io_kiocb *link, *nxt; |
2665abfd | 2121 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2122 | unsigned long flags; |
9e645e11 | 2123 | |
d148ca4b | 2124 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2125 | link = req->link; |
2126 | req->link = NULL; | |
9e645e11 | 2127 | |
f2f87370 PB |
2128 | while (link) { |
2129 | nxt = link->link; | |
2130 | link->link = NULL; | |
2665abfd | 2131 | |
f2f87370 | 2132 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2133 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2134 | |
2135 | /* | |
2136 | * It's ok to free under spinlock as they're not linked anymore, | |
2137 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2138 | * work.fs->lock. | |
2139 | */ | |
2140 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2141 | io_put_req_deferred(link, 2); | |
2142 | else | |
2143 | io_double_put_req(link); | |
f2f87370 | 2144 | link = nxt; |
9e645e11 | 2145 | } |
2665abfd | 2146 | io_commit_cqring(ctx); |
216578e5 | 2147 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2148 | |
2665abfd | 2149 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2150 | } |
2151 | ||
3fa5e0f3 | 2152 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2153 | { |
7c86ffee PB |
2154 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2155 | io_kill_linked_timeout(req); | |
944e58bf | 2156 | |
9e645e11 JA |
2157 | /* |
2158 | * If LINK is set, we have dependent requests in this chain. If we | |
2159 | * didn't fail this request, queue the first one up, moving any other | |
2160 | * dependencies to the next request. In case of failure, fail the rest | |
2161 | * of the chain. | |
2162 | */ | |
f2f87370 PB |
2163 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2164 | struct io_kiocb *nxt = req->link; | |
2165 | ||
2166 | req->link = NULL; | |
2167 | return nxt; | |
2168 | } | |
9b5f7bd9 PB |
2169 | io_fail_links(req); |
2170 | return NULL; | |
4d7dd462 | 2171 | } |
9e645e11 | 2172 | |
f2f87370 | 2173 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2174 | { |
cdbff982 | 2175 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
2176 | return NULL; |
2177 | return __io_req_find_next(req); | |
2178 | } | |
2179 | ||
7cbf1722 JA |
2180 | static bool __tctx_task_work(struct io_uring_task *tctx) |
2181 | { | |
65453d1e | 2182 | struct io_ring_ctx *ctx = NULL; |
7cbf1722 JA |
2183 | struct io_wq_work_list list; |
2184 | struct io_wq_work_node *node; | |
2185 | ||
2186 | if (wq_list_empty(&tctx->task_list)) | |
2187 | return false; | |
2188 | ||
0b81e80c | 2189 | spin_lock_irq(&tctx->task_lock); |
7cbf1722 JA |
2190 | list = tctx->task_list; |
2191 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2192 | spin_unlock_irq(&tctx->task_lock); |
7cbf1722 JA |
2193 | |
2194 | node = list.first; | |
2195 | while (node) { | |
2196 | struct io_wq_work_node *next = node->next; | |
65453d1e | 2197 | struct io_ring_ctx *this_ctx; |
7cbf1722 JA |
2198 | struct io_kiocb *req; |
2199 | ||
2200 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
65453d1e | 2201 | this_ctx = req->ctx; |
7cbf1722 JA |
2202 | req->task_work.func(&req->task_work); |
2203 | node = next; | |
65453d1e JA |
2204 | |
2205 | if (!ctx) { | |
2206 | ctx = this_ctx; | |
2207 | } else if (ctx != this_ctx) { | |
2208 | mutex_lock(&ctx->uring_lock); | |
2209 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2210 | mutex_unlock(&ctx->uring_lock); | |
2211 | ctx = this_ctx; | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | if (ctx && ctx->submit_state.comp.nr) { | |
2216 | mutex_lock(&ctx->uring_lock); | |
2217 | io_submit_flush_completions(&ctx->submit_state.comp, ctx); | |
2218 | mutex_unlock(&ctx->uring_lock); | |
7cbf1722 JA |
2219 | } |
2220 | ||
2221 | return list.first != NULL; | |
2222 | } | |
2223 | ||
2224 | static void tctx_task_work(struct callback_head *cb) | |
2225 | { | |
2226 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, task_work); | |
2227 | ||
2228 | while (__tctx_task_work(tctx)) | |
2229 | cond_resched(); | |
2230 | ||
2231 | clear_bit(0, &tctx->task_state); | |
2232 | } | |
2233 | ||
2234 | static int io_task_work_add(struct task_struct *tsk, struct io_kiocb *req, | |
2235 | enum task_work_notify_mode notify) | |
2236 | { | |
2237 | struct io_uring_task *tctx = tsk->io_uring; | |
2238 | struct io_wq_work_node *node, *prev; | |
0b81e80c | 2239 | unsigned long flags; |
7cbf1722 JA |
2240 | int ret; |
2241 | ||
2242 | WARN_ON_ONCE(!tctx); | |
2243 | ||
0b81e80c | 2244 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2245 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
0b81e80c | 2246 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2247 | |
2248 | /* task_work already pending, we're done */ | |
2249 | if (test_bit(0, &tctx->task_state) || | |
2250 | test_and_set_bit(0, &tctx->task_state)) | |
2251 | return 0; | |
2252 | ||
2253 | if (!task_work_add(tsk, &tctx->task_work, notify)) | |
2254 | return 0; | |
2255 | ||
2256 | /* | |
2257 | * Slow path - we failed, find and delete work. if the work is not | |
2258 | * in the list, it got run and we're fine. | |
2259 | */ | |
2260 | ret = 0; | |
0b81e80c | 2261 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 JA |
2262 | wq_list_for_each(node, prev, &tctx->task_list) { |
2263 | if (&req->io_task_work.node == node) { | |
2264 | wq_list_del(&tctx->task_list, node, prev); | |
2265 | ret = 1; | |
2266 | break; | |
2267 | } | |
2268 | } | |
0b81e80c | 2269 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2270 | clear_bit(0, &tctx->task_state); |
2271 | return ret; | |
2272 | } | |
2273 | ||
355fb9e2 | 2274 | static int io_req_task_work_add(struct io_kiocb *req) |
c2c4c83c JA |
2275 | { |
2276 | struct task_struct *tsk = req->task; | |
2277 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2278 | enum task_work_notify_mode notify; |
2279 | int ret; | |
c2c4c83c | 2280 | |
6200b0ae JA |
2281 | if (tsk->flags & PF_EXITING) |
2282 | return -ESRCH; | |
2283 | ||
c2c4c83c | 2284 | /* |
0ba9c9ed JA |
2285 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2286 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2287 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2288 | * will do the job. | |
c2c4c83c | 2289 | */ |
91989c70 | 2290 | notify = TWA_NONE; |
355fb9e2 | 2291 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) |
c2c4c83c JA |
2292 | notify = TWA_SIGNAL; |
2293 | ||
7cbf1722 | 2294 | ret = io_task_work_add(tsk, req, notify); |
c2c4c83c JA |
2295 | if (!ret) |
2296 | wake_up_process(tsk); | |
0ba9c9ed | 2297 | |
c2c4c83c JA |
2298 | return ret; |
2299 | } | |
2300 | ||
eab30c4d | 2301 | static void io_req_task_work_add_fallback(struct io_kiocb *req, |
7cbf1722 | 2302 | task_work_func_t cb) |
eab30c4d PB |
2303 | { |
2304 | struct task_struct *tsk = io_wq_get_task(req->ctx->io_wq); | |
2305 | ||
2306 | init_task_work(&req->task_work, cb); | |
2307 | task_work_add(tsk, &req->task_work, TWA_NONE); | |
2308 | wake_up_process(tsk); | |
2309 | } | |
2310 | ||
c40f6379 JA |
2311 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2312 | { | |
2313 | struct io_ring_ctx *ctx = req->ctx; | |
2314 | ||
2315 | spin_lock_irq(&ctx->completion_lock); | |
2316 | io_cqring_fill_event(req, error); | |
2317 | io_commit_cqring(ctx); | |
2318 | spin_unlock_irq(&ctx->completion_lock); | |
2319 | ||
2320 | io_cqring_ev_posted(ctx); | |
2321 | req_set_fail_links(req); | |
2322 | io_double_put_req(req); | |
2323 | } | |
2324 | ||
2325 | static void io_req_task_cancel(struct callback_head *cb) | |
2326 | { | |
2327 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2328 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2329 | |
2330 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2331 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2332 | } |
2333 | ||
2334 | static void __io_req_task_submit(struct io_kiocb *req) | |
2335 | { | |
2336 | struct io_ring_ctx *ctx = req->ctx; | |
2337 | ||
04fc6c80 | 2338 | /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ |
81b6d05c | 2339 | mutex_lock(&ctx->uring_lock); |
dc0eced5 PB |
2340 | if (!ctx->sqo_dead && !(current->flags & PF_EXITING) && |
2341 | !io_sq_thread_acquire_mm_files(ctx, req)) | |
c5eef2b9 | 2342 | __io_queue_sqe(req); |
81b6d05c | 2343 | else |
c40f6379 | 2344 | __io_req_task_cancel(req, -EFAULT); |
81b6d05c | 2345 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2346 | } |
2347 | ||
2348 | static void io_req_task_submit(struct callback_head *cb) | |
2349 | { | |
2350 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2351 | ||
2352 | __io_req_task_submit(req); | |
2353 | } | |
2354 | ||
2355 | static void io_req_task_queue(struct io_kiocb *req) | |
2356 | { | |
c40f6379 JA |
2357 | int ret; |
2358 | ||
7cbf1722 | 2359 | req->task_work.func = io_req_task_submit; |
355fb9e2 | 2360 | ret = io_req_task_work_add(req); |
04fc6c80 PB |
2361 | if (unlikely(ret)) { |
2362 | percpu_ref_get(&req->ctx->refs); | |
eab30c4d | 2363 | io_req_task_work_add_fallback(req, io_req_task_cancel); |
04fc6c80 | 2364 | } |
c40f6379 JA |
2365 | } |
2366 | ||
f2f87370 | 2367 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2368 | { |
9b5f7bd9 | 2369 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2370 | |
2371 | if (nxt) | |
906a8c3f | 2372 | io_req_task_queue(nxt); |
c69f8dbe JL |
2373 | } |
2374 | ||
c3524383 | 2375 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2376 | { |
c3524383 PB |
2377 | io_queue_next(req); |
2378 | __io_free_req(req); | |
2379 | } | |
8766dd51 | 2380 | |
2d6500d4 | 2381 | struct req_batch { |
5af1d13e PB |
2382 | struct task_struct *task; |
2383 | int task_refs; | |
1b4c351f | 2384 | int ctx_refs; |
2d6500d4 PB |
2385 | }; |
2386 | ||
5af1d13e PB |
2387 | static inline void io_init_req_batch(struct req_batch *rb) |
2388 | { | |
5af1d13e | 2389 | rb->task_refs = 0; |
9ae72463 | 2390 | rb->ctx_refs = 0; |
5af1d13e PB |
2391 | rb->task = NULL; |
2392 | } | |
2393 | ||
2d6500d4 PB |
2394 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2395 | struct req_batch *rb) | |
2396 | { | |
6e833d53 | 2397 | if (rb->task) |
7c660731 | 2398 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2399 | if (rb->ctx_refs) |
2400 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2401 | } |
2402 | ||
6ff119a6 PB |
2403 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2404 | struct io_submit_state *state) | |
2d6500d4 | 2405 | { |
f2f87370 | 2406 | io_queue_next(req); |
2d6500d4 | 2407 | |
e3bc8e9d | 2408 | if (req->task != rb->task) { |
7c660731 PB |
2409 | if (rb->task) |
2410 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2411 | rb->task = req->task; |
2412 | rb->task_refs = 0; | |
5af1d13e | 2413 | } |
e3bc8e9d | 2414 | rb->task_refs++; |
9ae72463 | 2415 | rb->ctx_refs++; |
5af1d13e | 2416 | |
4edf20f9 | 2417 | io_dismantle_req(req); |
bd759045 | 2418 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2419 | state->reqs[state->free_reqs++] = req; |
bd759045 PB |
2420 | else |
2421 | list_add(&req->compl.list, &state->comp.free_list); | |
7a743e22 PB |
2422 | } |
2423 | ||
905c172f PB |
2424 | static void io_submit_flush_completions(struct io_comp_state *cs, |
2425 | struct io_ring_ctx *ctx) | |
2426 | { | |
2427 | int i, nr = cs->nr; | |
2428 | struct io_kiocb *req; | |
2429 | struct req_batch rb; | |
2430 | ||
2431 | io_init_req_batch(&rb); | |
2432 | spin_lock_irq(&ctx->completion_lock); | |
2433 | for (i = 0; i < nr; i++) { | |
2434 | req = cs->reqs[i]; | |
2435 | __io_cqring_fill_event(req, req->result, req->compl.cflags); | |
2436 | } | |
2437 | io_commit_cqring(ctx); | |
2438 | spin_unlock_irq(&ctx->completion_lock); | |
2439 | ||
2440 | io_cqring_ev_posted(ctx); | |
2441 | for (i = 0; i < nr; i++) { | |
2442 | req = cs->reqs[i]; | |
2443 | ||
2444 | /* submission and completion refs */ | |
2445 | if (refcount_sub_and_test(2, &req->refs)) | |
6ff119a6 | 2446 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2447 | } |
2448 | ||
2449 | io_req_free_batch_finish(ctx, &rb); | |
2450 | cs->nr = 0; | |
2451 | } | |
2452 | ||
ba816ad6 JA |
2453 | /* |
2454 | * Drop reference to request, return next in chain (if there is one) if this | |
2455 | * was the last reference to this request. | |
2456 | */ | |
9b5f7bd9 | 2457 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2458 | { |
9b5f7bd9 PB |
2459 | struct io_kiocb *nxt = NULL; |
2460 | ||
2a44f467 | 2461 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2462 | nxt = io_req_find_next(req); |
4d7dd462 | 2463 | __io_free_req(req); |
2a44f467 | 2464 | } |
9b5f7bd9 | 2465 | return nxt; |
2b188cc1 JA |
2466 | } |
2467 | ||
e65ef56d JA |
2468 | static void io_put_req(struct io_kiocb *req) |
2469 | { | |
2470 | if (refcount_dec_and_test(&req->refs)) | |
2471 | io_free_req(req); | |
2b188cc1 JA |
2472 | } |
2473 | ||
216578e5 PB |
2474 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2475 | { | |
2476 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2477 | ||
2478 | io_free_req(req); | |
2479 | } | |
2480 | ||
2481 | static void io_free_req_deferred(struct io_kiocb *req) | |
2482 | { | |
2483 | int ret; | |
2484 | ||
7cbf1722 | 2485 | req->task_work.func = io_put_req_deferred_cb; |
355fb9e2 | 2486 | ret = io_req_task_work_add(req); |
eab30c4d PB |
2487 | if (unlikely(ret)) |
2488 | io_req_task_work_add_fallback(req, io_put_req_deferred_cb); | |
216578e5 PB |
2489 | } |
2490 | ||
2491 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2492 | { | |
2493 | if (refcount_sub_and_test(refs, &req->refs)) | |
2494 | io_free_req_deferred(req); | |
2495 | } | |
2496 | ||
978db57e JA |
2497 | static void io_double_put_req(struct io_kiocb *req) |
2498 | { | |
2499 | /* drop both submit and complete references */ | |
2500 | if (refcount_sub_and_test(2, &req->refs)) | |
2501 | io_free_req(req); | |
2502 | } | |
2503 | ||
6c503150 | 2504 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2505 | { |
2506 | /* See comment at the top of this file */ | |
2507 | smp_rmb(); | |
e23de15f | 2508 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2509 | } |
2510 | ||
fb5ccc98 PB |
2511 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2512 | { | |
2513 | struct io_rings *rings = ctx->rings; | |
2514 | ||
2515 | /* make sure SQ entry isn't read before tail */ | |
2516 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2517 | } | |
2518 | ||
8ff069bf | 2519 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2520 | { |
8ff069bf | 2521 | unsigned int cflags; |
e94f141b | 2522 | |
bcda7baa JA |
2523 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2524 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2525 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2526 | kfree(kbuf); |
2527 | return cflags; | |
e94f141b JA |
2528 | } |
2529 | ||
8ff069bf | 2530 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2531 | { |
4d954c25 | 2532 | struct io_buffer *kbuf; |
bcda7baa | 2533 | |
4d954c25 | 2534 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2535 | return io_put_kbuf(req, kbuf); |
2536 | } | |
2537 | ||
4c6e277c JA |
2538 | static inline bool io_run_task_work(void) |
2539 | { | |
6200b0ae JA |
2540 | /* |
2541 | * Not safe to run on exiting task, and the task_work handling will | |
2542 | * not add work to such a task. | |
2543 | */ | |
2544 | if (unlikely(current->flags & PF_EXITING)) | |
2545 | return false; | |
4c6e277c JA |
2546 | if (current->task_works) { |
2547 | __set_current_state(TASK_RUNNING); | |
2548 | task_work_run(); | |
2549 | return true; | |
2550 | } | |
2551 | ||
2552 | return false; | |
bcda7baa JA |
2553 | } |
2554 | ||
def596e9 JA |
2555 | /* |
2556 | * Find and free completed poll iocbs | |
2557 | */ | |
2558 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2559 | struct list_head *done) | |
2560 | { | |
8237e045 | 2561 | struct req_batch rb; |
def596e9 | 2562 | struct io_kiocb *req; |
bbde017a XW |
2563 | |
2564 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2565 | smp_rmb(); | |
def596e9 | 2566 | |
5af1d13e | 2567 | io_init_req_batch(&rb); |
def596e9 | 2568 | while (!list_empty(done)) { |
bcda7baa JA |
2569 | int cflags = 0; |
2570 | ||
d21ffe7e | 2571 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2572 | list_del(&req->inflight_entry); |
2573 | ||
bbde017a XW |
2574 | if (READ_ONCE(req->result) == -EAGAIN) { |
2575 | req->iopoll_completed = 0; | |
23faba36 | 2576 | if (io_rw_reissue(req)) |
f161340d | 2577 | continue; |
bbde017a | 2578 | } |
def596e9 | 2579 | |
bcda7baa | 2580 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2581 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2582 | |
2583 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2584 | (*nr_events)++; |
2585 | ||
c3524383 | 2586 | if (refcount_dec_and_test(&req->refs)) |
6ff119a6 | 2587 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2588 | } |
def596e9 | 2589 | |
09bb8394 | 2590 | io_commit_cqring(ctx); |
80c18e4a | 2591 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2592 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2593 | } |
2594 | ||
def596e9 JA |
2595 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2596 | long min) | |
2597 | { | |
2598 | struct io_kiocb *req, *tmp; | |
2599 | LIST_HEAD(done); | |
2600 | bool spin; | |
2601 | int ret; | |
2602 | ||
2603 | /* | |
2604 | * Only spin for completions if we don't have multiple devices hanging | |
2605 | * off our complete list, and we're under the requested amount. | |
2606 | */ | |
2607 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2608 | ||
2609 | ret = 0; | |
d21ffe7e | 2610 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2611 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2612 | |
2613 | /* | |
581f9810 BM |
2614 | * Move completed and retryable entries to our local lists. |
2615 | * If we find a request that requires polling, break out | |
2616 | * and complete those lists first, if we have entries there. | |
def596e9 | 2617 | */ |
65a6543d | 2618 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2619 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2620 | continue; |
2621 | } | |
2622 | if (!list_empty(&done)) | |
2623 | break; | |
2624 | ||
2625 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2626 | if (ret < 0) | |
2627 | break; | |
2628 | ||
3aadc23e PB |
2629 | /* iopoll may have completed current req */ |
2630 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2631 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2632 | |
def596e9 JA |
2633 | if (ret && spin) |
2634 | spin = false; | |
2635 | ret = 0; | |
2636 | } | |
2637 | ||
2638 | if (!list_empty(&done)) | |
2639 | io_iopoll_complete(ctx, nr_events, &done); | |
2640 | ||
2641 | return ret; | |
2642 | } | |
2643 | ||
2644 | /* | |
d195a66e | 2645 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2646 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2647 | * as a non-spinning completion check. | |
2648 | */ | |
2649 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2650 | long min) | |
2651 | { | |
540e32a0 | 2652 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2653 | int ret; |
2654 | ||
2655 | ret = io_do_iopoll(ctx, nr_events, min); | |
2656 | if (ret < 0) | |
2657 | return ret; | |
eba0a4dd | 2658 | if (*nr_events >= min) |
def596e9 JA |
2659 | return 0; |
2660 | } | |
2661 | ||
2662 | return 1; | |
2663 | } | |
2664 | ||
2665 | /* | |
2666 | * We can't just wait for polled events to come to us, we have to actively | |
2667 | * find and complete them. | |
2668 | */ | |
b2edc0a7 | 2669 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2670 | { |
2671 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2672 | return; | |
2673 | ||
2674 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2675 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2676 | unsigned int nr_events = 0; |
2677 | ||
b2edc0a7 | 2678 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2679 | |
b2edc0a7 PB |
2680 | /* let it sleep and repeat later if can't complete a request */ |
2681 | if (nr_events == 0) | |
2682 | break; | |
08f5439f JA |
2683 | /* |
2684 | * Ensure we allow local-to-the-cpu processing to take place, | |
2685 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2686 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2687 | */ |
3fcee5a6 PB |
2688 | if (need_resched()) { |
2689 | mutex_unlock(&ctx->uring_lock); | |
2690 | cond_resched(); | |
2691 | mutex_lock(&ctx->uring_lock); | |
2692 | } | |
def596e9 JA |
2693 | } |
2694 | mutex_unlock(&ctx->uring_lock); | |
2695 | } | |
2696 | ||
7668b92a | 2697 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2698 | { |
7668b92a | 2699 | unsigned int nr_events = 0; |
2b2ed975 | 2700 | int iters = 0, ret = 0; |
500f9fba | 2701 | |
c7849be9 XW |
2702 | /* |
2703 | * We disallow the app entering submit/complete with polling, but we | |
2704 | * still need to lock the ring to prevent racing with polled issue | |
2705 | * that got punted to a workqueue. | |
2706 | */ | |
2707 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2708 | do { |
a3a0e43f JA |
2709 | /* |
2710 | * Don't enter poll loop if we already have events pending. | |
2711 | * If we do, we can potentially be spinning for commands that | |
2712 | * already triggered a CQE (eg in error). | |
2713 | */ | |
6c503150 PB |
2714 | if (test_bit(0, &ctx->cq_check_overflow)) |
2715 | __io_cqring_overflow_flush(ctx, false, NULL, NULL); | |
2716 | if (io_cqring_events(ctx)) | |
a3a0e43f JA |
2717 | break; |
2718 | ||
500f9fba JA |
2719 | /* |
2720 | * If a submit got punted to a workqueue, we can have the | |
2721 | * application entering polling for a command before it gets | |
2722 | * issued. That app will hold the uring_lock for the duration | |
2723 | * of the poll right here, so we need to take a breather every | |
2724 | * now and then to ensure that the issue has a chance to add | |
2725 | * the poll to the issued list. Otherwise we can spin here | |
2726 | * forever, while the workqueue is stuck trying to acquire the | |
2727 | * very same mutex. | |
2728 | */ | |
2729 | if (!(++iters & 7)) { | |
2730 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2731 | io_run_task_work(); |
500f9fba JA |
2732 | mutex_lock(&ctx->uring_lock); |
2733 | } | |
2734 | ||
7668b92a | 2735 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2736 | if (ret <= 0) |
2737 | break; | |
2738 | ret = 0; | |
7668b92a | 2739 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2740 | |
500f9fba | 2741 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2742 | return ret; |
2743 | } | |
2744 | ||
491381ce | 2745 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2746 | { |
491381ce JA |
2747 | /* |
2748 | * Tell lockdep we inherited freeze protection from submission | |
2749 | * thread. | |
2750 | */ | |
2751 | if (req->flags & REQ_F_ISREG) { | |
2752 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2753 | |
491381ce | 2754 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2755 | } |
491381ce | 2756 | file_end_write(req->file); |
2b188cc1 JA |
2757 | } |
2758 | ||
b63534c4 | 2759 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2760 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 JA |
2761 | { |
2762 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
4a245479 | 2763 | int rw, ret; |
b63534c4 | 2764 | struct iov_iter iter; |
b63534c4 | 2765 | |
dc2a6e9a PB |
2766 | /* already prepared */ |
2767 | if (req->async_data) | |
2768 | return true; | |
b63534c4 JA |
2769 | |
2770 | switch (req->opcode) { | |
2771 | case IORING_OP_READV: | |
2772 | case IORING_OP_READ_FIXED: | |
2773 | case IORING_OP_READ: | |
2774 | rw = READ; | |
2775 | break; | |
2776 | case IORING_OP_WRITEV: | |
2777 | case IORING_OP_WRITE_FIXED: | |
2778 | case IORING_OP_WRITE: | |
2779 | rw = WRITE; | |
2780 | break; | |
2781 | default: | |
2782 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2783 | req->opcode); | |
dc2a6e9a | 2784 | return false; |
b63534c4 JA |
2785 | } |
2786 | ||
dc2a6e9a PB |
2787 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2788 | if (ret < 0) | |
2789 | return false; | |
6bf985dc | 2790 | return !io_setup_async_rw(req, iovec, inline_vecs, &iter, false); |
b63534c4 | 2791 | } |
b63534c4 JA |
2792 | #endif |
2793 | ||
23faba36 | 2794 | static bool io_rw_reissue(struct io_kiocb *req) |
b63534c4 JA |
2795 | { |
2796 | #ifdef CONFIG_BLOCK | |
23faba36 | 2797 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2798 | int ret; |
2799 | ||
75c668cd PB |
2800 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2801 | return false; | |
2802 | if ((req->flags & REQ_F_NOWAIT) || io_wq_current_is_worker()) | |
b63534c4 JA |
2803 | return false; |
2804 | ||
55e6ac1e PB |
2805 | lockdep_assert_held(&req->ctx->uring_lock); |
2806 | ||
28cea78a | 2807 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2808 | |
dc2a6e9a | 2809 | if (!ret && io_resubmit_prep(req)) { |
fdee946d JA |
2810 | refcount_inc(&req->refs); |
2811 | io_queue_async_work(req); | |
b63534c4 | 2812 | return true; |
fdee946d | 2813 | } |
dc2a6e9a | 2814 | req_set_fail_links(req); |
b63534c4 JA |
2815 | #endif |
2816 | return false; | |
2817 | } | |
2818 | ||
a1d7c393 | 2819 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2820 | unsigned int issue_flags) |
a1d7c393 | 2821 | { |
2f8e45f1 PB |
2822 | int cflags = 0; |
2823 | ||
23faba36 PB |
2824 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && io_rw_reissue(req)) |
2825 | return; | |
2f8e45f1 PB |
2826 | if (res != req->result) |
2827 | req_set_fail_links(req); | |
23faba36 | 2828 | |
2f8e45f1 PB |
2829 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2830 | kiocb_end_write(req); | |
2831 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2832 | cflags = io_put_rw_kbuf(req); | |
2833 | __io_req_complete(req, issue_flags, res, cflags); | |
ba816ad6 JA |
2834 | } |
2835 | ||
2836 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2837 | { | |
9adbd45d | 2838 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2839 | |
889fca73 | 2840 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2841 | } |
2842 | ||
def596e9 JA |
2843 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2844 | { | |
9adbd45d | 2845 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2846 | |
491381ce JA |
2847 | if (kiocb->ki_flags & IOCB_WRITE) |
2848 | kiocb_end_write(req); | |
def596e9 | 2849 | |
2d7d6792 | 2850 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2851 | req_set_fail_links(req); |
bbde017a XW |
2852 | |
2853 | WRITE_ONCE(req->result, res); | |
2854 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2855 | smp_wmb(); |
2856 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2857 | } |
2858 | ||
2859 | /* | |
2860 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2861 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2862 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2863 | * accessing the kiocb cookie. | |
2864 | */ | |
2e9dbe90 | 2865 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2866 | { |
2867 | struct io_ring_ctx *ctx = req->ctx; | |
2868 | ||
2869 | /* | |
2870 | * Track whether we have multiple files in our lists. This will impact | |
2871 | * how we do polling eventually, not spinning if we're on potentially | |
2872 | * different devices. | |
2873 | */ | |
540e32a0 | 2874 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2875 | ctx->poll_multi_file = false; |
2876 | } else if (!ctx->poll_multi_file) { | |
2877 | struct io_kiocb *list_req; | |
2878 | ||
540e32a0 | 2879 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2880 | inflight_entry); |
9adbd45d | 2881 | if (list_req->file != req->file) |
def596e9 JA |
2882 | ctx->poll_multi_file = true; |
2883 | } | |
2884 | ||
2885 | /* | |
2886 | * For fast devices, IO may have already completed. If it has, add | |
2887 | * it to the front so we find it first. | |
2888 | */ | |
65a6543d | 2889 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2890 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2891 | else |
d21ffe7e | 2892 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2893 | |
2e9dbe90 XW |
2894 | /* |
2895 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2896 | * task context or in io worker task context. If current task context is | |
2897 | * sq thread, we don't need to check whether should wake up sq thread. | |
2898 | */ | |
2899 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2900 | wq_has_sleeper(&ctx->sq_data->wait)) |
2901 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2902 | } |
2903 | ||
9f13c35b PB |
2904 | static inline void io_state_file_put(struct io_submit_state *state) |
2905 | { | |
02b23a9a PB |
2906 | if (state->file_refs) { |
2907 | fput_many(state->file, state->file_refs); | |
2908 | state->file_refs = 0; | |
2909 | } | |
9a56a232 JA |
2910 | } |
2911 | ||
2912 | /* | |
2913 | * Get as many references to a file as we have IOs left in this submission, | |
2914 | * assuming most submissions are for one file, or at least that each file | |
2915 | * has more than one submission. | |
2916 | */ | |
8da11c19 | 2917 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2918 | { |
2919 | if (!state) | |
2920 | return fget(fd); | |
2921 | ||
6e1271e6 | 2922 | if (state->file_refs) { |
9a56a232 | 2923 | if (state->fd == fd) { |
6e1271e6 | 2924 | state->file_refs--; |
9a56a232 JA |
2925 | return state->file; |
2926 | } | |
02b23a9a | 2927 | io_state_file_put(state); |
9a56a232 JA |
2928 | } |
2929 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2930 | if (unlikely(!state->file)) |
9a56a232 JA |
2931 | return NULL; |
2932 | ||
2933 | state->fd = fd; | |
6e1271e6 | 2934 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2935 | return state->file; |
2936 | } | |
2937 | ||
4503b767 JA |
2938 | static bool io_bdev_nowait(struct block_device *bdev) |
2939 | { | |
9ba0d0c8 | 2940 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2941 | } |
2942 | ||
2b188cc1 JA |
2943 | /* |
2944 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2945 | * any file. For now, just ensure that anything potentially problematic is done | |
2946 | * inline. | |
2947 | */ | |
af197f50 | 2948 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2949 | { |
2950 | umode_t mode = file_inode(file)->i_mode; | |
2951 | ||
4503b767 | 2952 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2953 | if (IS_ENABLED(CONFIG_BLOCK) && |
2954 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2955 | return true; |
2956 | return false; | |
2957 | } | |
2958 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2959 | return true; |
4503b767 | 2960 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2961 | if (IS_ENABLED(CONFIG_BLOCK) && |
2962 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2963 | file->f_op != &io_uring_fops) |
2964 | return true; | |
2965 | return false; | |
2966 | } | |
2b188cc1 | 2967 | |
c5b85625 JA |
2968 | /* any ->read/write should understand O_NONBLOCK */ |
2969 | if (file->f_flags & O_NONBLOCK) | |
2970 | return true; | |
2971 | ||
af197f50 JA |
2972 | if (!(file->f_mode & FMODE_NOWAIT)) |
2973 | return false; | |
2974 | ||
2975 | if (rw == READ) | |
2976 | return file->f_op->read_iter != NULL; | |
2977 | ||
2978 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2979 | } |
2980 | ||
a88fc400 | 2981 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2982 | { |
def596e9 | 2983 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2984 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2985 | struct file *file = req->file; |
09bb8394 JA |
2986 | unsigned ioprio; |
2987 | int ret; | |
2b188cc1 | 2988 | |
75c668cd | 2989 | if (S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2990 | req->flags |= REQ_F_ISREG; |
2991 | ||
2b188cc1 | 2992 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2993 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2994 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2995 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2996 | } |
2b188cc1 | 2997 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2998 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2999 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
3000 | if (unlikely(ret)) | |
3001 | return ret; | |
2b188cc1 | 3002 | |
75c668cd PB |
3003 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
3004 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
3005 | req->flags |= REQ_F_NOWAIT; | |
3006 | ||
2b188cc1 JA |
3007 | ioprio = READ_ONCE(sqe->ioprio); |
3008 | if (ioprio) { | |
3009 | ret = ioprio_check_cap(ioprio); | |
3010 | if (ret) | |
09bb8394 | 3011 | return ret; |
2b188cc1 JA |
3012 | |
3013 | kiocb->ki_ioprio = ioprio; | |
3014 | } else | |
3015 | kiocb->ki_ioprio = get_current_ioprio(); | |
3016 | ||
def596e9 | 3017 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
3018 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
3019 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 3020 | return -EOPNOTSUPP; |
2b188cc1 | 3021 | |
def596e9 JA |
3022 | kiocb->ki_flags |= IOCB_HIPRI; |
3023 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 3024 | req->iopoll_completed = 0; |
def596e9 | 3025 | } else { |
09bb8394 JA |
3026 | if (kiocb->ki_flags & IOCB_HIPRI) |
3027 | return -EINVAL; | |
def596e9 JA |
3028 | kiocb->ki_complete = io_complete_rw; |
3029 | } | |
9adbd45d | 3030 | |
3529d8c2 JA |
3031 | req->rw.addr = READ_ONCE(sqe->addr); |
3032 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 3033 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3034 | return 0; |
2b188cc1 JA |
3035 | } |
3036 | ||
3037 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3038 | { | |
3039 | switch (ret) { | |
3040 | case -EIOCBQUEUED: | |
3041 | break; | |
3042 | case -ERESTARTSYS: | |
3043 | case -ERESTARTNOINTR: | |
3044 | case -ERESTARTNOHAND: | |
3045 | case -ERESTART_RESTARTBLOCK: | |
3046 | /* | |
3047 | * We can't just restart the syscall, since previously | |
3048 | * submitted sqes may already be in progress. Just fail this | |
3049 | * IO with EINTR. | |
3050 | */ | |
3051 | ret = -EINTR; | |
df561f66 | 3052 | fallthrough; |
2b188cc1 JA |
3053 | default: |
3054 | kiocb->ki_complete(kiocb, ret, 0); | |
3055 | } | |
3056 | } | |
3057 | ||
a1d7c393 | 3058 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 3059 | unsigned int issue_flags) |
ba816ad6 | 3060 | { |
ba04291e | 3061 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 3062 | struct io_async_rw *io = req->async_data; |
ba04291e | 3063 | |
227c0c96 | 3064 | /* add previously done IO, if any */ |
e8c2bc1f | 3065 | if (io && io->bytes_done > 0) { |
227c0c96 | 3066 | if (ret < 0) |
e8c2bc1f | 3067 | ret = io->bytes_done; |
227c0c96 | 3068 | else |
e8c2bc1f | 3069 | ret += io->bytes_done; |
227c0c96 JA |
3070 | } |
3071 | ||
ba04291e JA |
3072 | if (req->flags & REQ_F_CUR_POS) |
3073 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 3074 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
889fca73 | 3075 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
3076 | else |
3077 | io_rw_done(kiocb, ret); | |
3078 | } | |
3079 | ||
847595de | 3080 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
edafccee | 3081 | { |
9adbd45d JA |
3082 | struct io_ring_ctx *ctx = req->ctx; |
3083 | size_t len = req->rw.len; | |
edafccee | 3084 | struct io_mapped_ubuf *imu; |
4be1c615 | 3085 | u16 index, buf_index = req->buf_index; |
edafccee JA |
3086 | size_t offset; |
3087 | u64 buf_addr; | |
3088 | ||
edafccee JA |
3089 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3090 | return -EFAULT; | |
edafccee JA |
3091 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3092 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 3093 | buf_addr = req->rw.addr; |
edafccee JA |
3094 | |
3095 | /* overflow */ | |
3096 | if (buf_addr + len < buf_addr) | |
3097 | return -EFAULT; | |
3098 | /* not inside the mapped region */ | |
3099 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
3100 | return -EFAULT; | |
3101 | ||
3102 | /* | |
3103 | * May not be a start of buffer, set size appropriately | |
3104 | * and advance us to the beginning. | |
3105 | */ | |
3106 | offset = buf_addr - imu->ubuf; | |
3107 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3108 | |
3109 | if (offset) { | |
3110 | /* | |
3111 | * Don't use iov_iter_advance() here, as it's really slow for | |
3112 | * using the latter parts of a big fixed buffer - it iterates | |
3113 | * over each segment manually. We can cheat a bit here, because | |
3114 | * we know that: | |
3115 | * | |
3116 | * 1) it's a BVEC iter, we set it up | |
3117 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3118 | * first and last bvec | |
3119 | * | |
3120 | * So just find our index, and adjust the iterator afterwards. | |
3121 | * If the offset is within the first bvec (or the whole first | |
3122 | * bvec, just use iov_iter_advance(). This makes it easier | |
3123 | * since we can just skip the first segment, which may not | |
3124 | * be PAGE_SIZE aligned. | |
3125 | */ | |
3126 | const struct bio_vec *bvec = imu->bvec; | |
3127 | ||
3128 | if (offset <= bvec->bv_len) { | |
3129 | iov_iter_advance(iter, offset); | |
3130 | } else { | |
3131 | unsigned long seg_skip; | |
3132 | ||
3133 | /* skip first vec */ | |
3134 | offset -= bvec->bv_len; | |
3135 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3136 | ||
3137 | iter->bvec = bvec + seg_skip; | |
3138 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3139 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3140 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3141 | } |
3142 | } | |
3143 | ||
847595de | 3144 | return 0; |
edafccee JA |
3145 | } |
3146 | ||
bcda7baa JA |
3147 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3148 | { | |
3149 | if (needs_lock) | |
3150 | mutex_unlock(&ctx->uring_lock); | |
3151 | } | |
3152 | ||
3153 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3154 | { | |
3155 | /* | |
3156 | * "Normal" inline submissions always hold the uring_lock, since we | |
3157 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3158 | * The only exception is when we've detached the request and issue it | |
3159 | * from an async worker thread, grab the lock for that case. | |
3160 | */ | |
3161 | if (needs_lock) | |
3162 | mutex_lock(&ctx->uring_lock); | |
3163 | } | |
3164 | ||
3165 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3166 | int bgid, struct io_buffer *kbuf, | |
3167 | bool needs_lock) | |
3168 | { | |
3169 | struct io_buffer *head; | |
3170 | ||
3171 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3172 | return kbuf; | |
3173 | ||
3174 | io_ring_submit_lock(req->ctx, needs_lock); | |
3175 | ||
3176 | lockdep_assert_held(&req->ctx->uring_lock); | |
3177 | ||
3178 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3179 | if (head) { | |
3180 | if (!list_empty(&head->list)) { | |
3181 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3182 | list); | |
3183 | list_del(&kbuf->list); | |
3184 | } else { | |
3185 | kbuf = head; | |
3186 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3187 | } | |
3188 | if (*len > kbuf->len) | |
3189 | *len = kbuf->len; | |
3190 | } else { | |
3191 | kbuf = ERR_PTR(-ENOBUFS); | |
3192 | } | |
3193 | ||
3194 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3195 | ||
3196 | return kbuf; | |
3197 | } | |
3198 | ||
4d954c25 JA |
3199 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3200 | bool needs_lock) | |
3201 | { | |
3202 | struct io_buffer *kbuf; | |
4f4eeba8 | 3203 | u16 bgid; |
4d954c25 JA |
3204 | |
3205 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3206 | bgid = req->buf_index; |
4d954c25 JA |
3207 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3208 | if (IS_ERR(kbuf)) | |
3209 | return kbuf; | |
3210 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3211 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3212 | return u64_to_user_ptr(kbuf->addr); | |
3213 | } | |
3214 | ||
3215 | #ifdef CONFIG_COMPAT | |
3216 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3217 | bool needs_lock) | |
3218 | { | |
3219 | struct compat_iovec __user *uiov; | |
3220 | compat_ssize_t clen; | |
3221 | void __user *buf; | |
3222 | ssize_t len; | |
3223 | ||
3224 | uiov = u64_to_user_ptr(req->rw.addr); | |
3225 | if (!access_ok(uiov, sizeof(*uiov))) | |
3226 | return -EFAULT; | |
3227 | if (__get_user(clen, &uiov->iov_len)) | |
3228 | return -EFAULT; | |
3229 | if (clen < 0) | |
3230 | return -EINVAL; | |
3231 | ||
3232 | len = clen; | |
3233 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3234 | if (IS_ERR(buf)) | |
3235 | return PTR_ERR(buf); | |
3236 | iov[0].iov_base = buf; | |
3237 | iov[0].iov_len = (compat_size_t) len; | |
3238 | return 0; | |
3239 | } | |
3240 | #endif | |
3241 | ||
3242 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3243 | bool needs_lock) | |
3244 | { | |
3245 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3246 | void __user *buf; | |
3247 | ssize_t len; | |
3248 | ||
3249 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3250 | return -EFAULT; | |
3251 | ||
3252 | len = iov[0].iov_len; | |
3253 | if (len < 0) | |
3254 | return -EINVAL; | |
3255 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3256 | if (IS_ERR(buf)) | |
3257 | return PTR_ERR(buf); | |
3258 | iov[0].iov_base = buf; | |
3259 | iov[0].iov_len = len; | |
3260 | return 0; | |
3261 | } | |
3262 | ||
3263 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3264 | bool needs_lock) | |
3265 | { | |
dddb3e26 JA |
3266 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3267 | struct io_buffer *kbuf; | |
3268 | ||
3269 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3270 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3271 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3272 | return 0; |
dddb3e26 | 3273 | } |
dd201662 | 3274 | if (req->rw.len != 1) |
4d954c25 JA |
3275 | return -EINVAL; |
3276 | ||
3277 | #ifdef CONFIG_COMPAT | |
3278 | if (req->ctx->compat) | |
3279 | return io_compat_import(req, iov, needs_lock); | |
3280 | #endif | |
3281 | ||
3282 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3283 | } | |
3284 | ||
847595de PB |
3285 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3286 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3287 | { |
9adbd45d JA |
3288 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3289 | size_t sqe_len = req->rw.len; | |
847595de | 3290 | u8 opcode = req->opcode; |
4d954c25 | 3291 | ssize_t ret; |
edafccee | 3292 | |
7d009165 | 3293 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3294 | *iovec = NULL; |
9adbd45d | 3295 | return io_import_fixed(req, rw, iter); |
edafccee | 3296 | } |
2b188cc1 | 3297 | |
bcda7baa | 3298 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3299 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3300 | return -EINVAL; |
3301 | ||
3a6820f2 | 3302 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3303 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3304 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3305 | if (IS_ERR(buf)) |
4d954c25 | 3306 | return PTR_ERR(buf); |
3f9d6441 | 3307 | req->rw.len = sqe_len; |
bcda7baa JA |
3308 | } |
3309 | ||
3a6820f2 JA |
3310 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3311 | *iovec = NULL; | |
10fc72e4 | 3312 | return ret; |
3a6820f2 JA |
3313 | } |
3314 | ||
4d954c25 JA |
3315 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3316 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3317 | if (!ret) |
3318 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3319 | *iovec = NULL; |
3320 | return ret; | |
3321 | } | |
3322 | ||
89cd35c5 CH |
3323 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3324 | req->ctx->compat); | |
2b188cc1 JA |
3325 | } |
3326 | ||
0fef9483 JA |
3327 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3328 | { | |
5b09e37e | 3329 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3330 | } |
3331 | ||
31b51510 | 3332 | /* |
32960613 JA |
3333 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3334 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3335 | */ |
4017eb91 | 3336 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3337 | { |
4017eb91 JA |
3338 | struct kiocb *kiocb = &req->rw.kiocb; |
3339 | struct file *file = req->file; | |
32960613 JA |
3340 | ssize_t ret = 0; |
3341 | ||
3342 | /* | |
3343 | * Don't support polled IO through this interface, and we can't | |
3344 | * support non-blocking either. For the latter, this just causes | |
3345 | * the kiocb to be handled from an async context. | |
3346 | */ | |
3347 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3348 | return -EOPNOTSUPP; | |
3349 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3350 | return -EAGAIN; | |
3351 | ||
3352 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3353 | struct iovec iovec; |
32960613 JA |
3354 | ssize_t nr; |
3355 | ||
311ae9e1 PB |
3356 | if (!iov_iter_is_bvec(iter)) { |
3357 | iovec = iov_iter_iovec(iter); | |
3358 | } else { | |
4017eb91 JA |
3359 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3360 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3361 | } |
3362 | ||
32960613 JA |
3363 | if (rw == READ) { |
3364 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3365 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3366 | } else { |
3367 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3368 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3369 | } |
3370 | ||
3371 | if (nr < 0) { | |
3372 | if (!ret) | |
3373 | ret = nr; | |
3374 | break; | |
3375 | } | |
3376 | ret += nr; | |
3377 | if (nr != iovec.iov_len) | |
3378 | break; | |
4017eb91 JA |
3379 | req->rw.len -= nr; |
3380 | req->rw.addr += nr; | |
32960613 JA |
3381 | iov_iter_advance(iter, nr); |
3382 | } | |
3383 | ||
3384 | return ret; | |
3385 | } | |
3386 | ||
ff6165b2 JA |
3387 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3388 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3389 | { |
e8c2bc1f | 3390 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3391 | |
ff6165b2 | 3392 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3393 | rw->free_iovec = iovec; |
227c0c96 | 3394 | rw->bytes_done = 0; |
ff6165b2 | 3395 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3396 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3397 | return; |
b64e3444 | 3398 | if (!iovec) { |
ff6165b2 JA |
3399 | unsigned iov_off = 0; |
3400 | ||
3401 | rw->iter.iov = rw->fast_iov; | |
3402 | if (iter->iov != fast_iov) { | |
3403 | iov_off = iter->iov - fast_iov; | |
3404 | rw->iter.iov += iov_off; | |
3405 | } | |
3406 | if (rw->fast_iov != fast_iov) | |
3407 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3408 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3409 | } else { |
3410 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3411 | } |
3412 | } | |
3413 | ||
e8c2bc1f | 3414 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3415 | { |
e8c2bc1f JA |
3416 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3417 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3418 | return req->async_data == NULL; | |
3d9932a8 XW |
3419 | } |
3420 | ||
e8c2bc1f | 3421 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3422 | { |
e8c2bc1f | 3423 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3424 | return 0; |
3d9932a8 | 3425 | |
e8c2bc1f | 3426 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3427 | } |
3428 | ||
ff6165b2 JA |
3429 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3430 | const struct iovec *fast_iov, | |
227c0c96 | 3431 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3432 | { |
e8c2bc1f | 3433 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3434 | return 0; |
e8c2bc1f | 3435 | if (!req->async_data) { |
6bf985dc PB |
3436 | if (__io_alloc_async_data(req)) { |
3437 | kfree(iovec); | |
5d204bcf | 3438 | return -ENOMEM; |
6bf985dc | 3439 | } |
b7bb4f7d | 3440 | |
ff6165b2 | 3441 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3442 | } |
b7bb4f7d | 3443 | return 0; |
f67676d1 JA |
3444 | } |
3445 | ||
73debe68 | 3446 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3447 | { |
e8c2bc1f | 3448 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3449 | struct iovec *iov = iorw->fast_iov; |
847595de | 3450 | int ret; |
c3e330a4 | 3451 | |
2846c481 | 3452 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3453 | if (unlikely(ret < 0)) |
3454 | return ret; | |
3455 | ||
ab0b196c PB |
3456 | iorw->bytes_done = 0; |
3457 | iorw->free_iovec = iov; | |
3458 | if (iov) | |
3459 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3460 | return 0; |
3461 | } | |
3462 | ||
73debe68 | 3463 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3464 | { |
3465 | ssize_t ret; | |
3466 | ||
a88fc400 | 3467 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3468 | if (ret) |
3469 | return ret; | |
f67676d1 | 3470 | |
3529d8c2 JA |
3471 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3472 | return -EBADF; | |
f67676d1 | 3473 | |
5f798bea | 3474 | /* either don't need iovec imported or already have it */ |
2d199895 | 3475 | if (!req->async_data) |
3529d8c2 | 3476 | return 0; |
73debe68 | 3477 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3478 | } |
3479 | ||
c1dd91d1 JA |
3480 | /* |
3481 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3482 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3483 | * This gets called when the page is unlocked, and we generally expect that to | |
3484 | * happen when the page IO is completed and the page is now uptodate. This will | |
3485 | * queue a task_work based retry of the operation, attempting to copy the data | |
3486 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3487 | * do a thread based blocking retry of the operation. That's the unexpected | |
3488 | * slow path. | |
3489 | */ | |
bcf5a063 JA |
3490 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3491 | int sync, void *arg) | |
3492 | { | |
3493 | struct wait_page_queue *wpq; | |
3494 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3495 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3496 | |
3497 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3498 | ||
cdc8fcb4 LT |
3499 | if (!wake_page_match(wpq, key)) |
3500 | return 0; | |
3501 | ||
c8d317aa | 3502 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3503 | list_del_init(&wait->entry); |
3504 | ||
bcf5a063 JA |
3505 | /* submit ref gets dropped, acquire a new one */ |
3506 | refcount_inc(&req->refs); | |
921b9054 | 3507 | io_req_task_queue(req); |
bcf5a063 JA |
3508 | return 1; |
3509 | } | |
3510 | ||
c1dd91d1 JA |
3511 | /* |
3512 | * This controls whether a given IO request should be armed for async page | |
3513 | * based retry. If we return false here, the request is handed to the async | |
3514 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3515 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3516 | * will either succeed because the page is now uptodate and unlocked, or it | |
3517 | * will register a callback when the page is unlocked at IO completion. Through | |
3518 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3519 | * That retry will attempt the buffered read again. The retry will generally | |
3520 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3521 | * async worker threads for a blocking retry. | |
3522 | */ | |
227c0c96 | 3523 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3524 | { |
e8c2bc1f JA |
3525 | struct io_async_rw *rw = req->async_data; |
3526 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3527 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3528 | |
bcf5a063 JA |
3529 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3530 | if (req->flags & REQ_F_NOWAIT) | |
3531 | return false; | |
f67676d1 | 3532 | |
227c0c96 | 3533 | /* Only for buffered IO */ |
3b2a4439 | 3534 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3535 | return false; |
3b2a4439 | 3536 | |
bcf5a063 JA |
3537 | /* |
3538 | * just use poll if we can, and don't attempt if the fs doesn't | |
3539 | * support callback based unlocks | |
3540 | */ | |
3541 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3542 | return false; | |
f67676d1 | 3543 | |
3b2a4439 JA |
3544 | wait->wait.func = io_async_buf_func; |
3545 | wait->wait.private = req; | |
3546 | wait->wait.flags = 0; | |
3547 | INIT_LIST_HEAD(&wait->wait.entry); | |
3548 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3549 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3550 | kiocb->ki_waitq = wait; |
3b2a4439 | 3551 | return true; |
bcf5a063 JA |
3552 | } |
3553 | ||
3554 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3555 | { | |
3556 | if (req->file->f_op->read_iter) | |
3557 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3558 | else if (req->file->f_op->read) |
4017eb91 | 3559 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3560 | else |
3561 | return -EINVAL; | |
f67676d1 JA |
3562 | } |
3563 | ||
889fca73 | 3564 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3565 | { |
3566 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3567 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3568 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3569 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3570 | ssize_t io_size, ret, ret2; |
45d189c6 | 3571 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3572 | |
2846c481 | 3573 | if (rw) { |
e8c2bc1f | 3574 | iter = &rw->iter; |
2846c481 PB |
3575 | iovec = NULL; |
3576 | } else { | |
3577 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3578 | if (ret < 0) | |
3579 | return ret; | |
3580 | } | |
632546c4 | 3581 | io_size = iov_iter_count(iter); |
fa15bafb | 3582 | req->result = io_size; |
2b188cc1 | 3583 | |
fd6c2e4c JA |
3584 | /* Ensure we clear previously set non-block flag */ |
3585 | if (!force_nonblock) | |
29de5f6a | 3586 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3587 | else |
3588 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3589 | ||
24c74678 | 3590 | /* If the file doesn't support async, just async punt */ |
6713e7a6 PB |
3591 | if (force_nonblock && !io_file_supports_async(req->file, READ)) { |
3592 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
6bf985dc | 3593 | return ret ?: -EAGAIN; |
6713e7a6 | 3594 | } |
9e645e11 | 3595 | |
632546c4 | 3596 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3597 | if (unlikely(ret)) { |
3598 | kfree(iovec); | |
3599 | return ret; | |
3600 | } | |
2b188cc1 | 3601 | |
227c0c96 | 3602 | ret = io_iter_do_read(req, iter); |
32960613 | 3603 | |
57cd657b | 3604 | if (ret == -EIOCBQUEUED) { |
fe1cdd55 | 3605 | goto out_free; |
227c0c96 | 3606 | } else if (ret == -EAGAIN) { |
eefdf30f JA |
3607 | /* IOPOLL retry should happen for io-wq threads */ |
3608 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3609 | goto done; |
75c668cd PB |
3610 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3611 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3612 | goto done; |
84216315 | 3613 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3614 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3615 | ret = 0; |
7335e3bf | 3616 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3617 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3618 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3619 | goto done; |
1a2cc0ce | 3620 | } |
227c0c96 | 3621 | |
227c0c96 | 3622 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3623 | if (ret2) |
3624 | return ret2; | |
3625 | ||
fe1cdd55 | 3626 | iovec = NULL; |
e8c2bc1f | 3627 | rw = req->async_data; |
227c0c96 | 3628 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3629 | iter = &rw->iter; |
227c0c96 | 3630 | |
b23df91b PB |
3631 | do { |
3632 | io_size -= ret; | |
3633 | rw->bytes_done += ret; | |
3634 | /* if we can retry, do so with the callbacks armed */ | |
3635 | if (!io_rw_should_retry(req)) { | |
3636 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3637 | return -EAGAIN; | |
3638 | } | |
3639 | ||
3640 | /* | |
3641 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3642 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3643 | * desired page gets unlocked. We can also get a partial read | |
3644 | * here, and if we do, then just retry at the new offset. | |
3645 | */ | |
3646 | ret = io_iter_do_read(req, iter); | |
3647 | if (ret == -EIOCBQUEUED) | |
3648 | return 0; | |
3649 | /* we got some bytes, but not all. retry. */ | |
3650 | } while (ret > 0 && ret < io_size); | |
227c0c96 | 3651 | done: |
889fca73 | 3652 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3653 | out_free: |
3654 | /* it's faster to check here then delegate to kfree */ | |
3655 | if (iovec) | |
3656 | kfree(iovec); | |
5ea5dd45 | 3657 | return 0; |
2b188cc1 JA |
3658 | } |
3659 | ||
73debe68 | 3660 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3661 | { |
3662 | ssize_t ret; | |
3663 | ||
a88fc400 | 3664 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3665 | if (ret) |
3666 | return ret; | |
f67676d1 | 3667 | |
3529d8c2 JA |
3668 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3669 | return -EBADF; | |
f67676d1 | 3670 | |
5f798bea | 3671 | /* either don't need iovec imported or already have it */ |
2d199895 | 3672 | if (!req->async_data) |
3529d8c2 | 3673 | return 0; |
73debe68 | 3674 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3675 | } |
3676 | ||
889fca73 | 3677 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3678 | { |
3679 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3680 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3681 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3682 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3683 | ssize_t ret, ret2, io_size; |
45d189c6 | 3684 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3685 | |
2846c481 | 3686 | if (rw) { |
e8c2bc1f | 3687 | iter = &rw->iter; |
2846c481 PB |
3688 | iovec = NULL; |
3689 | } else { | |
3690 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3691 | if (ret < 0) | |
3692 | return ret; | |
3693 | } | |
632546c4 | 3694 | io_size = iov_iter_count(iter); |
fa15bafb | 3695 | req->result = io_size; |
2b188cc1 | 3696 | |
fd6c2e4c JA |
3697 | /* Ensure we clear previously set non-block flag */ |
3698 | if (!force_nonblock) | |
a88fc400 PB |
3699 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3700 | else | |
3701 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3702 | |
24c74678 | 3703 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3704 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3705 | goto copy_iov; |
31b51510 | 3706 | |
10d59345 JA |
3707 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3708 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3709 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3710 | goto copy_iov; |
31b51510 | 3711 | |
632546c4 | 3712 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3713 | if (unlikely(ret)) |
3714 | goto out_free; | |
4ed734b0 | 3715 | |
fa15bafb PB |
3716 | /* |
3717 | * Open-code file_start_write here to grab freeze protection, | |
3718 | * which will be released by another thread in | |
3719 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3720 | * released so that it doesn't complain about the held lock when | |
3721 | * we return to userspace. | |
3722 | */ | |
3723 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3724 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3725 | __sb_writers_release(file_inode(req->file)->i_sb, |
3726 | SB_FREEZE_WRITE); | |
3727 | } | |
3728 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3729 | |
fa15bafb | 3730 | if (req->file->f_op->write_iter) |
ff6165b2 | 3731 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3732 | else if (req->file->f_op->write) |
4017eb91 | 3733 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3734 | else |
3735 | ret2 = -EINVAL; | |
4ed734b0 | 3736 | |
fa15bafb PB |
3737 | /* |
3738 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3739 | * retry them without IOCB_NOWAIT. | |
3740 | */ | |
3741 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3742 | ret2 = -EAGAIN; | |
75c668cd PB |
3743 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3744 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3745 | goto done; |
fa15bafb | 3746 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3747 | /* IOPOLL retry should happen for io-wq threads */ |
3748 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3749 | goto copy_iov; | |
355afaeb | 3750 | done: |
889fca73 | 3751 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3752 | } else { |
f67676d1 | 3753 | copy_iov: |
84216315 | 3754 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3755 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3756 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3757 | return ret ?: -EAGAIN; |
2b188cc1 | 3758 | } |
31b51510 | 3759 | out_free: |
f261c168 | 3760 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3761 | if (iovec) |
6f2cc166 | 3762 | kfree(iovec); |
2b188cc1 JA |
3763 | return ret; |
3764 | } | |
3765 | ||
80a261fd JA |
3766 | static int io_renameat_prep(struct io_kiocb *req, |
3767 | const struct io_uring_sqe *sqe) | |
3768 | { | |
3769 | struct io_rename *ren = &req->rename; | |
3770 | const char __user *oldf, *newf; | |
3771 | ||
3772 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3773 | return -EBADF; | |
3774 | ||
3775 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3776 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3777 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3778 | ren->new_dfd = READ_ONCE(sqe->len); | |
3779 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3780 | ||
3781 | ren->oldpath = getname(oldf); | |
3782 | if (IS_ERR(ren->oldpath)) | |
3783 | return PTR_ERR(ren->oldpath); | |
3784 | ||
3785 | ren->newpath = getname(newf); | |
3786 | if (IS_ERR(ren->newpath)) { | |
3787 | putname(ren->oldpath); | |
3788 | return PTR_ERR(ren->newpath); | |
3789 | } | |
3790 | ||
3791 | req->flags |= REQ_F_NEED_CLEANUP; | |
3792 | return 0; | |
3793 | } | |
3794 | ||
45d189c6 | 3795 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3796 | { |
3797 | struct io_rename *ren = &req->rename; | |
3798 | int ret; | |
3799 | ||
45d189c6 | 3800 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3801 | return -EAGAIN; |
3802 | ||
3803 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3804 | ren->newpath, ren->flags); | |
3805 | ||
3806 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3807 | if (ret < 0) | |
3808 | req_set_fail_links(req); | |
3809 | io_req_complete(req, ret); | |
3810 | return 0; | |
3811 | } | |
3812 | ||
14a1143b JA |
3813 | static int io_unlinkat_prep(struct io_kiocb *req, |
3814 | const struct io_uring_sqe *sqe) | |
3815 | { | |
3816 | struct io_unlink *un = &req->unlink; | |
3817 | const char __user *fname; | |
3818 | ||
3819 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3820 | return -EBADF; | |
3821 | ||
3822 | un->dfd = READ_ONCE(sqe->fd); | |
3823 | ||
3824 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3825 | if (un->flags & ~AT_REMOVEDIR) | |
3826 | return -EINVAL; | |
3827 | ||
3828 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3829 | un->filename = getname(fname); | |
3830 | if (IS_ERR(un->filename)) | |
3831 | return PTR_ERR(un->filename); | |
3832 | ||
3833 | req->flags |= REQ_F_NEED_CLEANUP; | |
3834 | return 0; | |
3835 | } | |
3836 | ||
45d189c6 | 3837 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3838 | { |
3839 | struct io_unlink *un = &req->unlink; | |
3840 | int ret; | |
3841 | ||
45d189c6 | 3842 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3843 | return -EAGAIN; |
3844 | ||
3845 | if (un->flags & AT_REMOVEDIR) | |
3846 | ret = do_rmdir(un->dfd, un->filename); | |
3847 | else | |
3848 | ret = do_unlinkat(un->dfd, un->filename); | |
3849 | ||
3850 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3851 | if (ret < 0) | |
3852 | req_set_fail_links(req); | |
3853 | io_req_complete(req, ret); | |
3854 | return 0; | |
3855 | } | |
3856 | ||
36f4fa68 JA |
3857 | static int io_shutdown_prep(struct io_kiocb *req, |
3858 | const struct io_uring_sqe *sqe) | |
3859 | { | |
3860 | #if defined(CONFIG_NET) | |
3861 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3862 | return -EINVAL; | |
3863 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3864 | sqe->buf_index) | |
3865 | return -EINVAL; | |
3866 | ||
3867 | req->shutdown.how = READ_ONCE(sqe->len); | |
3868 | return 0; | |
3869 | #else | |
3870 | return -EOPNOTSUPP; | |
3871 | #endif | |
3872 | } | |
3873 | ||
45d189c6 | 3874 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3875 | { |
3876 | #if defined(CONFIG_NET) | |
3877 | struct socket *sock; | |
3878 | int ret; | |
3879 | ||
45d189c6 | 3880 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3881 | return -EAGAIN; |
3882 | ||
48aba79b | 3883 | sock = sock_from_file(req->file); |
36f4fa68 | 3884 | if (unlikely(!sock)) |
48aba79b | 3885 | return -ENOTSOCK; |
36f4fa68 JA |
3886 | |
3887 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d JA |
3888 | if (ret < 0) |
3889 | req_set_fail_links(req); | |
36f4fa68 JA |
3890 | io_req_complete(req, ret); |
3891 | return 0; | |
3892 | #else | |
3893 | return -EOPNOTSUPP; | |
3894 | #endif | |
3895 | } | |
3896 | ||
f2a8d5c7 PB |
3897 | static int __io_splice_prep(struct io_kiocb *req, |
3898 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3899 | { |
3900 | struct io_splice* sp = &req->splice; | |
3901 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3902 | |
3232dd02 PB |
3903 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3904 | return -EINVAL; | |
7d67af2c PB |
3905 | |
3906 | sp->file_in = NULL; | |
7d67af2c PB |
3907 | sp->len = READ_ONCE(sqe->len); |
3908 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3909 | ||
3910 | if (unlikely(sp->flags & ~valid_flags)) | |
3911 | return -EINVAL; | |
3912 | ||
8371adf5 PB |
3913 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3914 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3915 | if (!sp->file_in) | |
3916 | return -EBADF; | |
7d67af2c PB |
3917 | req->flags |= REQ_F_NEED_CLEANUP; |
3918 | ||
7cdaf587 XW |
3919 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3920 | /* | |
3921 | * Splice operation will be punted aync, and here need to | |
3922 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3923 | */ | |
3924 | io_req_init_async(req); | |
7d67af2c | 3925 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3926 | } |
7d67af2c PB |
3927 | |
3928 | return 0; | |
3929 | } | |
3930 | ||
f2a8d5c7 PB |
3931 | static int io_tee_prep(struct io_kiocb *req, |
3932 | const struct io_uring_sqe *sqe) | |
3933 | { | |
3934 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3935 | return -EINVAL; | |
3936 | return __io_splice_prep(req, sqe); | |
3937 | } | |
3938 | ||
45d189c6 | 3939 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3940 | { |
3941 | struct io_splice *sp = &req->splice; | |
3942 | struct file *in = sp->file_in; | |
3943 | struct file *out = sp->file_out; | |
3944 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3945 | long ret = 0; | |
3946 | ||
45d189c6 | 3947 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3948 | return -EAGAIN; |
3949 | if (sp->len) | |
3950 | ret = do_tee(in, out, sp->len, flags); | |
3951 | ||
3952 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3953 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3954 | ||
f2a8d5c7 PB |
3955 | if (ret != sp->len) |
3956 | req_set_fail_links(req); | |
e1e16097 | 3957 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3958 | return 0; |
3959 | } | |
3960 | ||
3961 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3962 | { | |
3963 | struct io_splice* sp = &req->splice; | |
3964 | ||
3965 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3966 | sp->off_out = READ_ONCE(sqe->off); | |
3967 | return __io_splice_prep(req, sqe); | |
3968 | } | |
3969 | ||
45d189c6 | 3970 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3971 | { |
3972 | struct io_splice *sp = &req->splice; | |
3973 | struct file *in = sp->file_in; | |
3974 | struct file *out = sp->file_out; | |
3975 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3976 | loff_t *poff_in, *poff_out; | |
c9687426 | 3977 | long ret = 0; |
7d67af2c | 3978 | |
45d189c6 | 3979 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3980 | return -EAGAIN; |
7d67af2c PB |
3981 | |
3982 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3983 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3984 | |
948a7749 | 3985 | if (sp->len) |
c9687426 | 3986 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3987 | |
3988 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3989 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3990 | ||
7d67af2c PB |
3991 | if (ret != sp->len) |
3992 | req_set_fail_links(req); | |
e1e16097 | 3993 | io_req_complete(req, ret); |
7d67af2c PB |
3994 | return 0; |
3995 | } | |
3996 | ||
2b188cc1 JA |
3997 | /* |
3998 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3999 | */ | |
889fca73 | 4000 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4001 | { |
4002 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4003 | |
def596e9 JA |
4004 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4005 | return -EINVAL; | |
4006 | ||
889fca73 | 4007 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4008 | return 0; |
4009 | } | |
4010 | ||
3529d8c2 | 4011 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4012 | { |
6b06314c | 4013 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4014 | |
09bb8394 JA |
4015 | if (!req->file) |
4016 | return -EBADF; | |
c992fe29 | 4017 | |
6b06314c | 4018 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4019 | return -EINVAL; |
edafccee | 4020 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
4021 | return -EINVAL; |
4022 | ||
8ed8d3c3 JA |
4023 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4024 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4025 | return -EINVAL; | |
4026 | ||
4027 | req->sync.off = READ_ONCE(sqe->off); | |
4028 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4029 | return 0; |
4030 | } | |
4031 | ||
45d189c6 | 4032 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4033 | { |
8ed8d3c3 | 4034 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4035 | int ret; |
4036 | ||
ac45abc0 | 4037 | /* fsync always requires a blocking context */ |
45d189c6 | 4038 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4039 | return -EAGAIN; |
4040 | ||
9adbd45d | 4041 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4042 | end > 0 ? end : LLONG_MAX, |
4043 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4044 | if (ret < 0) | |
4045 | req_set_fail_links(req); | |
e1e16097 | 4046 | io_req_complete(req, ret); |
c992fe29 CH |
4047 | return 0; |
4048 | } | |
4049 | ||
d63d1b5e JA |
4050 | static int io_fallocate_prep(struct io_kiocb *req, |
4051 | const struct io_uring_sqe *sqe) | |
4052 | { | |
4053 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
4054 | return -EINVAL; | |
3232dd02 PB |
4055 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4056 | return -EINVAL; | |
d63d1b5e JA |
4057 | |
4058 | req->sync.off = READ_ONCE(sqe->off); | |
4059 | req->sync.len = READ_ONCE(sqe->addr); | |
4060 | req->sync.mode = READ_ONCE(sqe->len); | |
4061 | return 0; | |
4062 | } | |
4063 | ||
45d189c6 | 4064 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4065 | { |
ac45abc0 PB |
4066 | int ret; |
4067 | ||
d63d1b5e | 4068 | /* fallocate always requiring blocking context */ |
45d189c6 | 4069 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4070 | return -EAGAIN; |
ac45abc0 PB |
4071 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4072 | req->sync.len); | |
ac45abc0 PB |
4073 | if (ret < 0) |
4074 | req_set_fail_links(req); | |
e1e16097 | 4075 | io_req_complete(req, ret); |
5d17b4a4 JA |
4076 | return 0; |
4077 | } | |
4078 | ||
ec65fea5 | 4079 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4080 | { |
f8748881 | 4081 | const char __user *fname; |
15b71abe | 4082 | int ret; |
b7bb4f7d | 4083 | |
ec65fea5 | 4084 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4085 | return -EINVAL; |
ec65fea5 | 4086 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4087 | return -EBADF; |
03b1230c | 4088 | |
ec65fea5 PB |
4089 | /* open.how should be already initialised */ |
4090 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4091 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4092 | |
25e72d10 PB |
4093 | req->open.dfd = READ_ONCE(sqe->fd); |
4094 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4095 | req->open.filename = getname(fname); |
15b71abe JA |
4096 | if (IS_ERR(req->open.filename)) { |
4097 | ret = PTR_ERR(req->open.filename); | |
4098 | req->open.filename = NULL; | |
4099 | return ret; | |
4100 | } | |
4022e7af | 4101 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4102 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4103 | return 0; |
03b1230c JA |
4104 | } |
4105 | ||
ec65fea5 PB |
4106 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4107 | { | |
4108 | u64 flags, mode; | |
4109 | ||
14587a46 | 4110 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4111 | return -EINVAL; |
ec65fea5 PB |
4112 | mode = READ_ONCE(sqe->len); |
4113 | flags = READ_ONCE(sqe->open_flags); | |
4114 | req->open.how = build_open_how(flags, mode); | |
4115 | return __io_openat_prep(req, sqe); | |
4116 | } | |
4117 | ||
cebdb986 | 4118 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4119 | { |
cebdb986 | 4120 | struct open_how __user *how; |
cebdb986 | 4121 | size_t len; |
0fa03c62 JA |
4122 | int ret; |
4123 | ||
14587a46 | 4124 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4125 | return -EINVAL; |
cebdb986 JA |
4126 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4127 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4128 | if (len < OPEN_HOW_SIZE_VER0) |
4129 | return -EINVAL; | |
3529d8c2 | 4130 | |
cebdb986 JA |
4131 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4132 | len); | |
4133 | if (ret) | |
4134 | return ret; | |
3529d8c2 | 4135 | |
ec65fea5 | 4136 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4137 | } |
4138 | ||
45d189c6 | 4139 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4140 | { |
4141 | struct open_flags op; | |
15b71abe | 4142 | struct file *file; |
3a81fd02 JA |
4143 | bool nonblock_set; |
4144 | bool resolve_nonblock; | |
15b71abe JA |
4145 | int ret; |
4146 | ||
cebdb986 | 4147 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4148 | if (ret) |
4149 | goto err; | |
3a81fd02 JA |
4150 | nonblock_set = op.open_flag & O_NONBLOCK; |
4151 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4152 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4153 | /* |
4154 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4155 | * it'll always -EAGAIN | |
4156 | */ | |
4157 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4158 | return -EAGAIN; | |
4159 | op.lookup_flags |= LOOKUP_CACHED; | |
4160 | op.open_flag |= O_NONBLOCK; | |
4161 | } | |
15b71abe | 4162 | |
4022e7af | 4163 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4164 | if (ret < 0) |
4165 | goto err; | |
4166 | ||
4167 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3a81fd02 | 4168 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
45d189c6 PB |
4169 | if ((!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK)) && |
4170 | file == ERR_PTR(-EAGAIN)) { | |
3a81fd02 JA |
4171 | /* |
4172 | * We could hang on to this 'fd', but seems like marginal | |
4173 | * gain for something that is now known to be a slower path. | |
4174 | * So just put it, and we'll get a new one when we retry. | |
4175 | */ | |
4176 | put_unused_fd(ret); | |
4177 | return -EAGAIN; | |
4178 | } | |
4179 | ||
15b71abe JA |
4180 | if (IS_ERR(file)) { |
4181 | put_unused_fd(ret); | |
4182 | ret = PTR_ERR(file); | |
4183 | } else { | |
45d189c6 | 4184 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) |
3a81fd02 | 4185 | file->f_flags &= ~O_NONBLOCK; |
15b71abe JA |
4186 | fsnotify_open(file); |
4187 | fd_install(ret, file); | |
4188 | } | |
4189 | err: | |
4190 | putname(req->open.filename); | |
8fef80bf | 4191 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4192 | if (ret < 0) |
4193 | req_set_fail_links(req); | |
e1e16097 | 4194 | io_req_complete(req, ret); |
15b71abe JA |
4195 | return 0; |
4196 | } | |
4197 | ||
45d189c6 | 4198 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4199 | { |
45d189c6 | 4200 | return io_openat2(req, issue_flags & IO_URING_F_NONBLOCK); |
cebdb986 JA |
4201 | } |
4202 | ||
067524e9 JA |
4203 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4204 | const struct io_uring_sqe *sqe) | |
4205 | { | |
4206 | struct io_provide_buf *p = &req->pbuf; | |
4207 | u64 tmp; | |
4208 | ||
4209 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4210 | return -EINVAL; | |
4211 | ||
4212 | tmp = READ_ONCE(sqe->fd); | |
4213 | if (!tmp || tmp > USHRT_MAX) | |
4214 | return -EINVAL; | |
4215 | ||
4216 | memset(p, 0, sizeof(*p)); | |
4217 | p->nbufs = tmp; | |
4218 | p->bgid = READ_ONCE(sqe->buf_group); | |
4219 | return 0; | |
4220 | } | |
4221 | ||
4222 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4223 | int bgid, unsigned nbufs) | |
4224 | { | |
4225 | unsigned i = 0; | |
4226 | ||
4227 | /* shouldn't happen */ | |
4228 | if (!nbufs) | |
4229 | return 0; | |
4230 | ||
4231 | /* the head kbuf is the list itself */ | |
4232 | while (!list_empty(&buf->list)) { | |
4233 | struct io_buffer *nxt; | |
4234 | ||
4235 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4236 | list_del(&nxt->list); | |
4237 | kfree(nxt); | |
4238 | if (++i == nbufs) | |
4239 | return i; | |
4240 | } | |
4241 | i++; | |
4242 | kfree(buf); | |
4243 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4244 | ||
4245 | return i; | |
4246 | } | |
4247 | ||
889fca73 | 4248 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4249 | { |
4250 | struct io_provide_buf *p = &req->pbuf; | |
4251 | struct io_ring_ctx *ctx = req->ctx; | |
4252 | struct io_buffer *head; | |
4253 | int ret = 0; | |
45d189c6 | 4254 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4255 | |
4256 | io_ring_submit_lock(ctx, !force_nonblock); | |
4257 | ||
4258 | lockdep_assert_held(&ctx->uring_lock); | |
4259 | ||
4260 | ret = -ENOENT; | |
4261 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4262 | if (head) | |
4263 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 JA |
4264 | if (ret < 0) |
4265 | req_set_fail_links(req); | |
067524e9 | 4266 | |
31bff9a5 PB |
4267 | /* need to hold the lock to complete IOPOLL requests */ |
4268 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4269 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4270 | io_ring_submit_unlock(ctx, !force_nonblock); |
4271 | } else { | |
4272 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4273 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4274 | } |
067524e9 JA |
4275 | return 0; |
4276 | } | |
4277 | ||
ddf0322d JA |
4278 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4279 | const struct io_uring_sqe *sqe) | |
4280 | { | |
4281 | struct io_provide_buf *p = &req->pbuf; | |
4282 | u64 tmp; | |
4283 | ||
4284 | if (sqe->ioprio || sqe->rw_flags) | |
4285 | return -EINVAL; | |
4286 | ||
4287 | tmp = READ_ONCE(sqe->fd); | |
4288 | if (!tmp || tmp > USHRT_MAX) | |
4289 | return -E2BIG; | |
4290 | p->nbufs = tmp; | |
4291 | p->addr = READ_ONCE(sqe->addr); | |
4292 | p->len = READ_ONCE(sqe->len); | |
4293 | ||
efe68c1c | 4294 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4295 | return -EFAULT; |
4296 | ||
4297 | p->bgid = READ_ONCE(sqe->buf_group); | |
4298 | tmp = READ_ONCE(sqe->off); | |
4299 | if (tmp > USHRT_MAX) | |
4300 | return -E2BIG; | |
4301 | p->bid = tmp; | |
4302 | return 0; | |
4303 | } | |
4304 | ||
4305 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4306 | { | |
4307 | struct io_buffer *buf; | |
4308 | u64 addr = pbuf->addr; | |
4309 | int i, bid = pbuf->bid; | |
4310 | ||
4311 | for (i = 0; i < pbuf->nbufs; i++) { | |
4312 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4313 | if (!buf) | |
4314 | break; | |
4315 | ||
4316 | buf->addr = addr; | |
4317 | buf->len = pbuf->len; | |
4318 | buf->bid = bid; | |
4319 | addr += pbuf->len; | |
4320 | bid++; | |
4321 | if (!*head) { | |
4322 | INIT_LIST_HEAD(&buf->list); | |
4323 | *head = buf; | |
4324 | } else { | |
4325 | list_add_tail(&buf->list, &(*head)->list); | |
4326 | } | |
4327 | } | |
4328 | ||
4329 | return i ? i : -ENOMEM; | |
4330 | } | |
4331 | ||
889fca73 | 4332 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4333 | { |
4334 | struct io_provide_buf *p = &req->pbuf; | |
4335 | struct io_ring_ctx *ctx = req->ctx; | |
4336 | struct io_buffer *head, *list; | |
4337 | int ret = 0; | |
45d189c6 | 4338 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4339 | |
4340 | io_ring_submit_lock(ctx, !force_nonblock); | |
4341 | ||
4342 | lockdep_assert_held(&ctx->uring_lock); | |
4343 | ||
4344 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4345 | ||
4346 | ret = io_add_buffers(p, &head); | |
4347 | if (ret < 0) | |
4348 | goto out; | |
4349 | ||
4350 | if (!list) { | |
4351 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4352 | GFP_KERNEL); | |
4353 | if (ret < 0) { | |
067524e9 | 4354 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4355 | goto out; |
4356 | } | |
4357 | } | |
4358 | out: | |
ddf0322d JA |
4359 | if (ret < 0) |
4360 | req_set_fail_links(req); | |
31bff9a5 PB |
4361 | |
4362 | /* need to hold the lock to complete IOPOLL requests */ | |
4363 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
889fca73 | 4364 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 PB |
4365 | io_ring_submit_unlock(ctx, !force_nonblock); |
4366 | } else { | |
4367 | io_ring_submit_unlock(ctx, !force_nonblock); | |
889fca73 | 4368 | __io_req_complete(req, issue_flags, ret, 0); |
31bff9a5 | 4369 | } |
ddf0322d | 4370 | return 0; |
cebdb986 JA |
4371 | } |
4372 | ||
3e4827b0 JA |
4373 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4374 | const struct io_uring_sqe *sqe) | |
4375 | { | |
4376 | #if defined(CONFIG_EPOLL) | |
4377 | if (sqe->ioprio || sqe->buf_index) | |
4378 | return -EINVAL; | |
6ca56f84 | 4379 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4380 | return -EINVAL; |
3e4827b0 JA |
4381 | |
4382 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4383 | req->epoll.op = READ_ONCE(sqe->len); | |
4384 | req->epoll.fd = READ_ONCE(sqe->off); | |
4385 | ||
4386 | if (ep_op_has_event(req->epoll.op)) { | |
4387 | struct epoll_event __user *ev; | |
4388 | ||
4389 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4390 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4391 | return -EFAULT; | |
4392 | } | |
4393 | ||
4394 | return 0; | |
4395 | #else | |
4396 | return -EOPNOTSUPP; | |
4397 | #endif | |
4398 | } | |
4399 | ||
889fca73 | 4400 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4401 | { |
4402 | #if defined(CONFIG_EPOLL) | |
4403 | struct io_epoll *ie = &req->epoll; | |
4404 | int ret; | |
45d189c6 | 4405 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4406 | |
4407 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4408 | if (force_nonblock && ret == -EAGAIN) | |
4409 | return -EAGAIN; | |
4410 | ||
4411 | if (ret < 0) | |
4412 | req_set_fail_links(req); | |
889fca73 | 4413 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4414 | return 0; |
4415 | #else | |
4416 | return -EOPNOTSUPP; | |
4417 | #endif | |
4418 | } | |
4419 | ||
c1ca757b JA |
4420 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4421 | { | |
4422 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4423 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4424 | return -EINVAL; | |
3232dd02 PB |
4425 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4426 | return -EINVAL; | |
c1ca757b JA |
4427 | |
4428 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4429 | req->madvise.len = READ_ONCE(sqe->len); | |
4430 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4431 | return 0; | |
4432 | #else | |
4433 | return -EOPNOTSUPP; | |
4434 | #endif | |
4435 | } | |
4436 | ||
45d189c6 | 4437 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4438 | { |
4439 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4440 | struct io_madvise *ma = &req->madvise; | |
4441 | int ret; | |
4442 | ||
45d189c6 | 4443 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4444 | return -EAGAIN; |
4445 | ||
0726b01e | 4446 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4447 | if (ret < 0) |
4448 | req_set_fail_links(req); | |
e1e16097 | 4449 | io_req_complete(req, ret); |
c1ca757b JA |
4450 | return 0; |
4451 | #else | |
4452 | return -EOPNOTSUPP; | |
4453 | #endif | |
4454 | } | |
4455 | ||
4840e418 JA |
4456 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4457 | { | |
4458 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4459 | return -EINVAL; | |
3232dd02 PB |
4460 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4461 | return -EINVAL; | |
4840e418 JA |
4462 | |
4463 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4464 | req->fadvise.len = READ_ONCE(sqe->len); | |
4465 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4466 | return 0; | |
4467 | } | |
4468 | ||
45d189c6 | 4469 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4470 | { |
4471 | struct io_fadvise *fa = &req->fadvise; | |
4472 | int ret; | |
4473 | ||
45d189c6 | 4474 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4475 | switch (fa->advice) { |
4476 | case POSIX_FADV_NORMAL: | |
4477 | case POSIX_FADV_RANDOM: | |
4478 | case POSIX_FADV_SEQUENTIAL: | |
4479 | break; | |
4480 | default: | |
4481 | return -EAGAIN; | |
4482 | } | |
4483 | } | |
4840e418 JA |
4484 | |
4485 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4486 | if (ret < 0) | |
4487 | req_set_fail_links(req); | |
e1e16097 | 4488 | io_req_complete(req, ret); |
4840e418 JA |
4489 | return 0; |
4490 | } | |
4491 | ||
eddc7ef5 JA |
4492 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4493 | { | |
6ca56f84 | 4494 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4495 | return -EINVAL; |
eddc7ef5 JA |
4496 | if (sqe->ioprio || sqe->buf_index) |
4497 | return -EINVAL; | |
9c280f90 | 4498 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4499 | return -EBADF; |
eddc7ef5 | 4500 | |
1d9e1288 BM |
4501 | req->statx.dfd = READ_ONCE(sqe->fd); |
4502 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4503 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4504 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4505 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4506 | |
4507 | return 0; | |
4508 | } | |
4509 | ||
45d189c6 | 4510 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4511 | { |
1d9e1288 | 4512 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4513 | int ret; |
4514 | ||
45d189c6 | 4515 | if (issue_flags & IO_URING_F_NONBLOCK) { |
5b0bbee4 JA |
4516 | /* only need file table for an actual valid fd */ |
4517 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4518 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4519 | return -EAGAIN; |
5b0bbee4 | 4520 | } |
eddc7ef5 | 4521 | |
e62753e4 BM |
4522 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4523 | ctx->buffer); | |
eddc7ef5 | 4524 | |
eddc7ef5 JA |
4525 | if (ret < 0) |
4526 | req_set_fail_links(req); | |
e1e16097 | 4527 | io_req_complete(req, ret); |
eddc7ef5 JA |
4528 | return 0; |
4529 | } | |
4530 | ||
b5dba59e JA |
4531 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4532 | { | |
14587a46 | 4533 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4534 | return -EINVAL; |
b5dba59e JA |
4535 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4536 | sqe->rw_flags || sqe->buf_index) | |
4537 | return -EINVAL; | |
9c280f90 | 4538 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4539 | return -EBADF; |
b5dba59e JA |
4540 | |
4541 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4542 | return 0; |
b5dba59e JA |
4543 | } |
4544 | ||
889fca73 | 4545 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4546 | { |
9eac1904 | 4547 | struct files_struct *files = current->files; |
3af73b28 | 4548 | struct io_close *close = &req->close; |
9eac1904 JA |
4549 | struct fdtable *fdt; |
4550 | struct file *file; | |
b5dba59e JA |
4551 | int ret; |
4552 | ||
9eac1904 JA |
4553 | file = NULL; |
4554 | ret = -EBADF; | |
4555 | spin_lock(&files->file_lock); | |
4556 | fdt = files_fdtable(files); | |
4557 | if (close->fd >= fdt->max_fds) { | |
4558 | spin_unlock(&files->file_lock); | |
4559 | goto err; | |
4560 | } | |
4561 | file = fdt->fd[close->fd]; | |
4562 | if (!file) { | |
4563 | spin_unlock(&files->file_lock); | |
4564 | goto err; | |
4565 | } | |
4566 | ||
4567 | if (file->f_op == &io_uring_fops) { | |
4568 | spin_unlock(&files->file_lock); | |
4569 | file = NULL; | |
4570 | goto err; | |
3af73b28 | 4571 | } |
b5dba59e JA |
4572 | |
4573 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4574 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4575 | spin_unlock(&files->file_lock); |
0bf0eefd | 4576 | return -EAGAIN; |
a2100672 | 4577 | } |
b5dba59e | 4578 | |
9eac1904 JA |
4579 | ret = __close_fd_get_file(close->fd, &file); |
4580 | spin_unlock(&files->file_lock); | |
4581 | if (ret < 0) { | |
4582 | if (ret == -ENOENT) | |
4583 | ret = -EBADF; | |
4584 | goto err; | |
4585 | } | |
4586 | ||
3af73b28 | 4587 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4588 | ret = filp_close(file, current->files); |
4589 | err: | |
3af73b28 PB |
4590 | if (ret < 0) |
4591 | req_set_fail_links(req); | |
9eac1904 JA |
4592 | if (file) |
4593 | fput(file); | |
889fca73 | 4594 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4595 | return 0; |
b5dba59e JA |
4596 | } |
4597 | ||
3529d8c2 | 4598 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4599 | { |
4600 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4601 | |
4602 | if (!req->file) | |
4603 | return -EBADF; | |
5d17b4a4 JA |
4604 | |
4605 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4606 | return -EINVAL; | |
4607 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4608 | return -EINVAL; | |
4609 | ||
8ed8d3c3 JA |
4610 | req->sync.off = READ_ONCE(sqe->off); |
4611 | req->sync.len = READ_ONCE(sqe->len); | |
4612 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4613 | return 0; |
4614 | } | |
4615 | ||
45d189c6 | 4616 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4617 | { |
8ed8d3c3 JA |
4618 | int ret; |
4619 | ||
ac45abc0 | 4620 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4621 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4622 | return -EAGAIN; |
4623 | ||
9adbd45d | 4624 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4625 | req->sync.flags); |
4626 | if (ret < 0) | |
4627 | req_set_fail_links(req); | |
e1e16097 | 4628 | io_req_complete(req, ret); |
5d17b4a4 JA |
4629 | return 0; |
4630 | } | |
4631 | ||
469956e8 | 4632 | #if defined(CONFIG_NET) |
02d27d89 PB |
4633 | static int io_setup_async_msg(struct io_kiocb *req, |
4634 | struct io_async_msghdr *kmsg) | |
4635 | { | |
e8c2bc1f JA |
4636 | struct io_async_msghdr *async_msg = req->async_data; |
4637 | ||
4638 | if (async_msg) | |
02d27d89 | 4639 | return -EAGAIN; |
e8c2bc1f | 4640 | if (io_alloc_async_data(req)) { |
257e84a5 | 4641 | kfree(kmsg->free_iov); |
02d27d89 PB |
4642 | return -ENOMEM; |
4643 | } | |
e8c2bc1f | 4644 | async_msg = req->async_data; |
02d27d89 | 4645 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4646 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4647 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4648 | /* if were using fast_iov, set it to the new one */ |
4649 | if (!async_msg->free_iov) | |
4650 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4651 | ||
02d27d89 PB |
4652 | return -EAGAIN; |
4653 | } | |
4654 | ||
2ae523ed PB |
4655 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4656 | struct io_async_msghdr *iomsg) | |
4657 | { | |
2ae523ed | 4658 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4659 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4660 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4661 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4662 | } |
4663 | ||
3529d8c2 | 4664 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4665 | { |
e8c2bc1f | 4666 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4667 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4668 | int ret; |
03b1230c | 4669 | |
d2b6f48b PB |
4670 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4671 | return -EINVAL; | |
4672 | ||
e47293fd | 4673 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4674 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4675 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4676 | |
d8768362 JA |
4677 | #ifdef CONFIG_COMPAT |
4678 | if (req->ctx->compat) | |
4679 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4680 | #endif | |
4681 | ||
e8c2bc1f | 4682 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4683 | return 0; |
e8c2bc1f | 4684 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4685 | if (!ret) |
4686 | req->flags |= REQ_F_NEED_CLEANUP; | |
4687 | return ret; | |
03b1230c JA |
4688 | } |
4689 | ||
889fca73 | 4690 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4691 | { |
6b754c8b | 4692 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4693 | struct socket *sock; |
7a7cacba | 4694 | unsigned flags; |
0fa03c62 JA |
4695 | int ret; |
4696 | ||
dba4a925 | 4697 | sock = sock_from_file(req->file); |
7a7cacba | 4698 | if (unlikely(!sock)) |
dba4a925 | 4699 | return -ENOTSOCK; |
3529d8c2 | 4700 | |
257e84a5 PB |
4701 | kmsg = req->async_data; |
4702 | if (!kmsg) { | |
7a7cacba PB |
4703 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4704 | if (ret) | |
4705 | return ret; | |
4706 | kmsg = &iomsg; | |
0fa03c62 | 4707 | } |
0fa03c62 | 4708 | |
7a7cacba PB |
4709 | flags = req->sr_msg.msg_flags; |
4710 | if (flags & MSG_DONTWAIT) | |
4711 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4712 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4713 | flags |= MSG_DONTWAIT; |
e47293fd | 4714 | |
7a7cacba | 4715 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4716 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4717 | return io_setup_async_msg(req, kmsg); |
4718 | if (ret == -ERESTARTSYS) | |
4719 | ret = -EINTR; | |
0fa03c62 | 4720 | |
257e84a5 PB |
4721 | /* fast path, check for non-NULL to avoid function call */ |
4722 | if (kmsg->free_iov) | |
4723 | kfree(kmsg->free_iov); | |
99bc4c38 | 4724 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4725 | if (ret < 0) |
4726 | req_set_fail_links(req); | |
889fca73 | 4727 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4728 | return 0; |
03b1230c | 4729 | } |
aa1fa28f | 4730 | |
889fca73 | 4731 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4732 | { |
7a7cacba PB |
4733 | struct io_sr_msg *sr = &req->sr_msg; |
4734 | struct msghdr msg; | |
4735 | struct iovec iov; | |
fddaface | 4736 | struct socket *sock; |
7a7cacba | 4737 | unsigned flags; |
fddaface JA |
4738 | int ret; |
4739 | ||
dba4a925 | 4740 | sock = sock_from_file(req->file); |
7a7cacba | 4741 | if (unlikely(!sock)) |
dba4a925 | 4742 | return -ENOTSOCK; |
fddaface | 4743 | |
7a7cacba PB |
4744 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4745 | if (unlikely(ret)) | |
14db8411 | 4746 | return ret; |
fddaface | 4747 | |
7a7cacba PB |
4748 | msg.msg_name = NULL; |
4749 | msg.msg_control = NULL; | |
4750 | msg.msg_controllen = 0; | |
4751 | msg.msg_namelen = 0; | |
fddaface | 4752 | |
7a7cacba PB |
4753 | flags = req->sr_msg.msg_flags; |
4754 | if (flags & MSG_DONTWAIT) | |
4755 | req->flags |= REQ_F_NOWAIT; | |
45d189c6 | 4756 | else if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 4757 | flags |= MSG_DONTWAIT; |
fddaface | 4758 | |
7a7cacba PB |
4759 | msg.msg_flags = flags; |
4760 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4761 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4762 | return -EAGAIN; |
4763 | if (ret == -ERESTARTSYS) | |
4764 | ret = -EINTR; | |
fddaface | 4765 | |
fddaface JA |
4766 | if (ret < 0) |
4767 | req_set_fail_links(req); | |
889fca73 | 4768 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4769 | return 0; |
fddaface JA |
4770 | } |
4771 | ||
1400e697 PB |
4772 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4773 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4774 | { |
4775 | struct io_sr_msg *sr = &req->sr_msg; | |
4776 | struct iovec __user *uiov; | |
4777 | size_t iov_len; | |
4778 | int ret; | |
4779 | ||
1400e697 PB |
4780 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4781 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4782 | if (ret) |
4783 | return ret; | |
4784 | ||
4785 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4786 | if (iov_len > 1) | |
4787 | return -EINVAL; | |
5476dfed | 4788 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4789 | return -EFAULT; |
5476dfed | 4790 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4791 | iomsg->free_iov = NULL; |
52de1fe1 | 4792 | } else { |
257e84a5 | 4793 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4794 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4795 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4796 | false); |
52de1fe1 JA |
4797 | if (ret > 0) |
4798 | ret = 0; | |
4799 | } | |
4800 | ||
4801 | return ret; | |
4802 | } | |
4803 | ||
4804 | #ifdef CONFIG_COMPAT | |
4805 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4806 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4807 | { |
4808 | struct compat_msghdr __user *msg_compat; | |
4809 | struct io_sr_msg *sr = &req->sr_msg; | |
4810 | struct compat_iovec __user *uiov; | |
4811 | compat_uptr_t ptr; | |
4812 | compat_size_t len; | |
4813 | int ret; | |
4814 | ||
270a5940 | 4815 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4816 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4817 | &ptr, &len); |
4818 | if (ret) | |
4819 | return ret; | |
4820 | ||
4821 | uiov = compat_ptr(ptr); | |
4822 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4823 | compat_ssize_t clen; | |
4824 | ||
4825 | if (len > 1) | |
4826 | return -EINVAL; | |
4827 | if (!access_ok(uiov, sizeof(*uiov))) | |
4828 | return -EFAULT; | |
4829 | if (__get_user(clen, &uiov->iov_len)) | |
4830 | return -EFAULT; | |
4831 | if (clen < 0) | |
4832 | return -EINVAL; | |
2d280bc8 | 4833 | sr->len = clen; |
257e84a5 | 4834 | iomsg->free_iov = NULL; |
52de1fe1 | 4835 | } else { |
257e84a5 | 4836 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4837 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4838 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4839 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4840 | if (ret < 0) |
4841 | return ret; | |
4842 | } | |
4843 | ||
4844 | return 0; | |
4845 | } | |
4846 | #endif | |
4847 | ||
1400e697 PB |
4848 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4849 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4850 | { |
1400e697 | 4851 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4852 | |
4853 | #ifdef CONFIG_COMPAT | |
4854 | if (req->ctx->compat) | |
1400e697 | 4855 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4856 | #endif |
52de1fe1 | 4857 | |
1400e697 | 4858 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4859 | } |
4860 | ||
bcda7baa | 4861 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4862 | bool needs_lock) |
bcda7baa JA |
4863 | { |
4864 | struct io_sr_msg *sr = &req->sr_msg; | |
4865 | struct io_buffer *kbuf; | |
4866 | ||
bcda7baa JA |
4867 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4868 | if (IS_ERR(kbuf)) | |
4869 | return kbuf; | |
4870 | ||
4871 | sr->kbuf = kbuf; | |
4872 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4873 | return kbuf; |
fddaface JA |
4874 | } |
4875 | ||
7fbb1b54 PB |
4876 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4877 | { | |
4878 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4879 | } | |
4880 | ||
3529d8c2 JA |
4881 | static int io_recvmsg_prep(struct io_kiocb *req, |
4882 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4883 | { |
e8c2bc1f | 4884 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4885 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4886 | int ret; |
3529d8c2 | 4887 | |
d2b6f48b PB |
4888 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4889 | return -EINVAL; | |
4890 | ||
3529d8c2 | 4891 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4892 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4893 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4894 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4895 | |
d8768362 JA |
4896 | #ifdef CONFIG_COMPAT |
4897 | if (req->ctx->compat) | |
4898 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4899 | #endif | |
4900 | ||
e8c2bc1f | 4901 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4902 | return 0; |
e8c2bc1f | 4903 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4904 | if (!ret) |
4905 | req->flags |= REQ_F_NEED_CLEANUP; | |
4906 | return ret; | |
aa1fa28f JA |
4907 | } |
4908 | ||
889fca73 | 4909 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4910 | { |
6b754c8b | 4911 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4912 | struct socket *sock; |
7fbb1b54 | 4913 | struct io_buffer *kbuf; |
7a7cacba | 4914 | unsigned flags; |
52de1fe1 | 4915 | int ret, cflags = 0; |
45d189c6 | 4916 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4917 | |
dba4a925 | 4918 | sock = sock_from_file(req->file); |
7a7cacba | 4919 | if (unlikely(!sock)) |
dba4a925 | 4920 | return -ENOTSOCK; |
3529d8c2 | 4921 | |
257e84a5 PB |
4922 | kmsg = req->async_data; |
4923 | if (!kmsg) { | |
7a7cacba PB |
4924 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4925 | if (ret) | |
681fda8d | 4926 | return ret; |
7a7cacba PB |
4927 | kmsg = &iomsg; |
4928 | } | |
03b1230c | 4929 | |
bc02ef33 | 4930 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4931 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4932 | if (IS_ERR(kbuf)) |
52de1fe1 | 4933 | return PTR_ERR(kbuf); |
7a7cacba | 4934 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4935 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4936 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4937 | 1, req->sr_msg.len); |
4938 | } | |
52de1fe1 | 4939 | |
7a7cacba PB |
4940 | flags = req->sr_msg.msg_flags; |
4941 | if (flags & MSG_DONTWAIT) | |
4942 | req->flags |= REQ_F_NOWAIT; | |
4943 | else if (force_nonblock) | |
4944 | flags |= MSG_DONTWAIT; | |
e47293fd | 4945 | |
7a7cacba PB |
4946 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4947 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4948 | if (force_nonblock && ret == -EAGAIN) |
4949 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4950 | if (ret == -ERESTARTSYS) |
4951 | ret = -EINTR; | |
03b1230c | 4952 | |
7fbb1b54 PB |
4953 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4954 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4955 | /* fast path, check for non-NULL to avoid function call */ |
4956 | if (kmsg->free_iov) | |
4957 | kfree(kmsg->free_iov); | |
99bc4c38 | 4958 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4959 | if (ret < 0) |
4960 | req_set_fail_links(req); | |
889fca73 | 4961 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4962 | return 0; |
0fa03c62 | 4963 | } |
5d17b4a4 | 4964 | |
889fca73 | 4965 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4966 | { |
6b754c8b | 4967 | struct io_buffer *kbuf; |
7a7cacba PB |
4968 | struct io_sr_msg *sr = &req->sr_msg; |
4969 | struct msghdr msg; | |
4970 | void __user *buf = sr->buf; | |
fddaface | 4971 | struct socket *sock; |
7a7cacba PB |
4972 | struct iovec iov; |
4973 | unsigned flags; | |
bcda7baa | 4974 | int ret, cflags = 0; |
45d189c6 | 4975 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4976 | |
dba4a925 | 4977 | sock = sock_from_file(req->file); |
7a7cacba | 4978 | if (unlikely(!sock)) |
dba4a925 | 4979 | return -ENOTSOCK; |
fddaface | 4980 | |
bc02ef33 | 4981 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4982 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4983 | if (IS_ERR(kbuf)) |
4984 | return PTR_ERR(kbuf); | |
7a7cacba | 4985 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4986 | } |
bcda7baa | 4987 | |
7a7cacba | 4988 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4989 | if (unlikely(ret)) |
4990 | goto out_free; | |
fddaface | 4991 | |
7a7cacba PB |
4992 | msg.msg_name = NULL; |
4993 | msg.msg_control = NULL; | |
4994 | msg.msg_controllen = 0; | |
4995 | msg.msg_namelen = 0; | |
4996 | msg.msg_iocb = NULL; | |
4997 | msg.msg_flags = 0; | |
fddaface | 4998 | |
7a7cacba PB |
4999 | flags = req->sr_msg.msg_flags; |
5000 | if (flags & MSG_DONTWAIT) | |
5001 | req->flags |= REQ_F_NOWAIT; | |
5002 | else if (force_nonblock) | |
5003 | flags |= MSG_DONTWAIT; | |
5004 | ||
5005 | ret = sock_recvmsg(sock, &msg, flags); | |
5006 | if (force_nonblock && ret == -EAGAIN) | |
5007 | return -EAGAIN; | |
5008 | if (ret == -ERESTARTSYS) | |
5009 | ret = -EINTR; | |
14c32eee | 5010 | out_free: |
7fbb1b54 PB |
5011 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5012 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
5013 | if (ret < 0) |
5014 | req_set_fail_links(req); | |
889fca73 | 5015 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5016 | return 0; |
fddaface JA |
5017 | } |
5018 | ||
3529d8c2 | 5019 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5020 | { |
8ed8d3c3 JA |
5021 | struct io_accept *accept = &req->accept; |
5022 | ||
14587a46 | 5023 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5024 | return -EINVAL; |
8042d6ce | 5025 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5026 | return -EINVAL; |
5027 | ||
d55e5f5b JA |
5028 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5029 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5030 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5031 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 5032 | return 0; |
8ed8d3c3 | 5033 | } |
17f2fe35 | 5034 | |
889fca73 | 5035 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5036 | { |
5037 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5038 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5039 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
5040 | int ret; |
5041 | ||
e697deed JX |
5042 | if (req->file->f_flags & O_NONBLOCK) |
5043 | req->flags |= REQ_F_NOWAIT; | |
5044 | ||
8ed8d3c3 | 5045 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
5046 | accept->addr_len, accept->flags, |
5047 | accept->nofile); | |
8ed8d3c3 | 5048 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 5049 | return -EAGAIN; |
ac45abc0 PB |
5050 | if (ret < 0) { |
5051 | if (ret == -ERESTARTSYS) | |
5052 | ret = -EINTR; | |
4e88d6e7 | 5053 | req_set_fail_links(req); |
ac45abc0 | 5054 | } |
889fca73 | 5055 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5056 | return 0; |
8ed8d3c3 JA |
5057 | } |
5058 | ||
3529d8c2 | 5059 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5060 | { |
3529d8c2 | 5061 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 5062 | struct io_async_connect *io = req->async_data; |
f499a021 | 5063 | |
14587a46 | 5064 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
5065 | return -EINVAL; |
5066 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
5067 | return -EINVAL; | |
5068 | ||
3529d8c2 JA |
5069 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5070 | conn->addr_len = READ_ONCE(sqe->addr2); | |
5071 | ||
5072 | if (!io) | |
5073 | return 0; | |
5074 | ||
5075 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 5076 | &io->address); |
f499a021 JA |
5077 | } |
5078 | ||
889fca73 | 5079 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5080 | { |
e8c2bc1f | 5081 | struct io_async_connect __io, *io; |
f8e85cf2 | 5082 | unsigned file_flags; |
3fbb51c1 | 5083 | int ret; |
45d189c6 | 5084 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5085 | |
e8c2bc1f JA |
5086 | if (req->async_data) { |
5087 | io = req->async_data; | |
f499a021 | 5088 | } else { |
3529d8c2 JA |
5089 | ret = move_addr_to_kernel(req->connect.addr, |
5090 | req->connect.addr_len, | |
e8c2bc1f | 5091 | &__io.address); |
f499a021 JA |
5092 | if (ret) |
5093 | goto out; | |
5094 | io = &__io; | |
5095 | } | |
5096 | ||
3fbb51c1 JA |
5097 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5098 | ||
e8c2bc1f | 5099 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5100 | req->connect.addr_len, file_flags); |
87f80d62 | 5101 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5102 | if (req->async_data) |
b7bb4f7d | 5103 | return -EAGAIN; |
e8c2bc1f | 5104 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5105 | ret = -ENOMEM; |
5106 | goto out; | |
5107 | } | |
e8c2bc1f JA |
5108 | io = req->async_data; |
5109 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 5110 | return -EAGAIN; |
f499a021 | 5111 | } |
f8e85cf2 JA |
5112 | if (ret == -ERESTARTSYS) |
5113 | ret = -EINTR; | |
f499a021 | 5114 | out: |
4e88d6e7 JA |
5115 | if (ret < 0) |
5116 | req_set_fail_links(req); | |
889fca73 | 5117 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5118 | return 0; |
469956e8 Y |
5119 | } |
5120 | #else /* !CONFIG_NET */ | |
5121 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5122 | { | |
f8e85cf2 | 5123 | return -EOPNOTSUPP; |
f8e85cf2 JA |
5124 | } |
5125 | ||
889fca73 | 5126 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5127 | { |
5128 | return -EOPNOTSUPP; | |
5129 | } | |
5130 | ||
889fca73 | 5131 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5132 | { |
5133 | return -EOPNOTSUPP; | |
5134 | } | |
5135 | ||
5136 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5137 | const struct io_uring_sqe *sqe) | |
5138 | { | |
5139 | return -EOPNOTSUPP; | |
5140 | } | |
5141 | ||
889fca73 | 5142 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5143 | { |
5144 | return -EOPNOTSUPP; | |
5145 | } | |
5146 | ||
889fca73 | 5147 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5148 | { |
5149 | return -EOPNOTSUPP; | |
5150 | } | |
5151 | ||
5152 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5153 | { | |
5154 | return -EOPNOTSUPP; | |
5155 | } | |
5156 | ||
889fca73 | 5157 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 Y |
5158 | { |
5159 | return -EOPNOTSUPP; | |
5160 | } | |
ce593a6c | 5161 | |
469956e8 Y |
5162 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5163 | { | |
5164 | return -EOPNOTSUPP; | |
5165 | } | |
5166 | ||
889fca73 | 5167 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
469956e8 | 5168 | { |
f8e85cf2 | 5169 | return -EOPNOTSUPP; |
ce593a6c | 5170 | } |
469956e8 | 5171 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5172 | |
d7718a9d JA |
5173 | struct io_poll_table { |
5174 | struct poll_table_struct pt; | |
5175 | struct io_kiocb *req; | |
5176 | int error; | |
5177 | }; | |
ce593a6c | 5178 | |
d7718a9d JA |
5179 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5180 | __poll_t mask, task_work_func_t func) | |
5181 | { | |
aa96bf8a | 5182 | int ret; |
d7718a9d JA |
5183 | |
5184 | /* for instances that support it check for an event match first: */ | |
5185 | if (mask && !(mask & poll->events)) | |
5186 | return 0; | |
5187 | ||
5188 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5189 | ||
5190 | list_del_init(&poll->wait.entry); | |
5191 | ||
d7718a9d | 5192 | req->result = mask; |
7cbf1722 | 5193 | req->task_work.func = func; |
6d816e08 JA |
5194 | percpu_ref_get(&req->ctx->refs); |
5195 | ||
d7718a9d | 5196 | /* |
e3aabf95 JA |
5197 | * If this fails, then the task is exiting. When a task exits, the |
5198 | * work gets canceled, so just cancel this request as well instead | |
5199 | * of executing it. We can't safely execute it anyway, as we may not | |
5200 | * have the needed state needed for it anyway. | |
d7718a9d | 5201 | */ |
355fb9e2 | 5202 | ret = io_req_task_work_add(req); |
aa96bf8a | 5203 | if (unlikely(ret)) { |
e3aabf95 | 5204 | WRITE_ONCE(poll->canceled, true); |
eab30c4d | 5205 | io_req_task_work_add_fallback(req, func); |
aa96bf8a | 5206 | } |
d7718a9d JA |
5207 | return 1; |
5208 | } | |
5209 | ||
74ce6ce4 JA |
5210 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5211 | __acquires(&req->ctx->completion_lock) | |
5212 | { | |
5213 | struct io_ring_ctx *ctx = req->ctx; | |
5214 | ||
5215 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5216 | struct poll_table_struct pt = { ._key = poll->events }; | |
5217 | ||
5218 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5219 | } | |
5220 | ||
5221 | spin_lock_irq(&ctx->completion_lock); | |
5222 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5223 | add_wait_queue(poll->head, &poll->wait); | |
5224 | return true; | |
5225 | } | |
5226 | ||
5227 | return false; | |
5228 | } | |
5229 | ||
d4e7cd36 | 5230 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5231 | { |
e8c2bc1f | 5232 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5233 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5234 | return req->async_data; |
d4e7cd36 JA |
5235 | return req->apoll->double_poll; |
5236 | } | |
5237 | ||
5238 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5239 | { | |
5240 | if (req->opcode == IORING_OP_POLL_ADD) | |
5241 | return &req->poll; | |
5242 | return &req->apoll->poll; | |
5243 | } | |
5244 | ||
5245 | static void io_poll_remove_double(struct io_kiocb *req) | |
5246 | { | |
5247 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5248 | |
5249 | lockdep_assert_held(&req->ctx->completion_lock); | |
5250 | ||
5251 | if (poll && poll->head) { | |
5252 | struct wait_queue_head *head = poll->head; | |
5253 | ||
5254 | spin_lock(&head->lock); | |
5255 | list_del_init(&poll->wait.entry); | |
5256 | if (poll->wait.private) | |
5257 | refcount_dec(&req->refs); | |
5258 | poll->head = NULL; | |
5259 | spin_unlock(&head->lock); | |
5260 | } | |
5261 | } | |
5262 | ||
5263 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5264 | { | |
5265 | struct io_ring_ctx *ctx = req->ctx; | |
5266 | ||
d4e7cd36 | 5267 | io_poll_remove_double(req); |
18bceab1 JA |
5268 | req->poll.done = true; |
5269 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5270 | io_commit_cqring(ctx); | |
5271 | } | |
5272 | ||
dd221f46 | 5273 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5274 | { |
dd221f46 | 5275 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5276 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5277 | struct io_kiocb *nxt; |
18bceab1 JA |
5278 | |
5279 | if (io_poll_rewait(req, &req->poll)) { | |
5280 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5281 | } else { |
5282 | hash_del(&req->hash_node); | |
5283 | io_poll_complete(req, req->result, 0); | |
5284 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5285 | |
dd221f46 PB |
5286 | nxt = io_put_req_find_next(req); |
5287 | io_cqring_ev_posted(ctx); | |
5288 | if (nxt) | |
5289 | __io_req_task_submit(nxt); | |
5290 | } | |
18bceab1 | 5291 | |
6d816e08 | 5292 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5293 | } |
5294 | ||
5295 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5296 | int sync, void *key) | |
5297 | { | |
5298 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5299 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5300 | __poll_t mask = key_to_poll(key); |
5301 | ||
5302 | /* for instances that support it check for an event match first: */ | |
5303 | if (mask && !(mask & poll->events)) | |
5304 | return 0; | |
5305 | ||
8706e04e JA |
5306 | list_del_init(&wait->entry); |
5307 | ||
807abcb0 | 5308 | if (poll && poll->head) { |
18bceab1 JA |
5309 | bool done; |
5310 | ||
807abcb0 JA |
5311 | spin_lock(&poll->head->lock); |
5312 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5313 | if (!done) |
807abcb0 | 5314 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5315 | /* make sure double remove sees this as being gone */ |
5316 | wait->private = NULL; | |
807abcb0 | 5317 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5318 | if (!done) { |
5319 | /* use wait func handler, so it matches the rq type */ | |
5320 | poll->wait.func(&poll->wait, mode, sync, key); | |
5321 | } | |
18bceab1 JA |
5322 | } |
5323 | refcount_dec(&req->refs); | |
5324 | return 1; | |
5325 | } | |
5326 | ||
5327 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5328 | wait_queue_func_t wake_func) | |
5329 | { | |
5330 | poll->head = NULL; | |
5331 | poll->done = false; | |
5332 | poll->canceled = false; | |
5333 | poll->events = events; | |
5334 | INIT_LIST_HEAD(&poll->wait.entry); | |
5335 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5336 | } | |
5337 | ||
5338 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5339 | struct wait_queue_head *head, |
5340 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5341 | { |
5342 | struct io_kiocb *req = pt->req; | |
5343 | ||
5344 | /* | |
5345 | * If poll->head is already set, it's because the file being polled | |
5346 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5347 | * for write). Setup a separate io_poll_iocb if this happens. | |
5348 | */ | |
5349 | if (unlikely(poll->head)) { | |
58852d4d PB |
5350 | struct io_poll_iocb *poll_one = poll; |
5351 | ||
18bceab1 | 5352 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5353 | if (*poll_ptr) { |
18bceab1 JA |
5354 | pt->error = -EINVAL; |
5355 | return; | |
5356 | } | |
5357 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5358 | if (!poll) { | |
5359 | pt->error = -ENOMEM; | |
5360 | return; | |
5361 | } | |
58852d4d | 5362 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5363 | refcount_inc(&req->refs); |
5364 | poll->wait.private = req; | |
807abcb0 | 5365 | *poll_ptr = poll; |
18bceab1 JA |
5366 | } |
5367 | ||
5368 | pt->error = 0; | |
5369 | poll->head = head; | |
a31eb4a2 JX |
5370 | |
5371 | if (poll->events & EPOLLEXCLUSIVE) | |
5372 | add_wait_queue_exclusive(head, &poll->wait); | |
5373 | else | |
5374 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5375 | } |
5376 | ||
5377 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5378 | struct poll_table_struct *p) | |
5379 | { | |
5380 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5381 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5382 | |
807abcb0 | 5383 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5384 | } |
5385 | ||
d7718a9d JA |
5386 | static void io_async_task_func(struct callback_head *cb) |
5387 | { | |
5388 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5389 | struct async_poll *apoll = req->apoll; | |
5390 | struct io_ring_ctx *ctx = req->ctx; | |
5391 | ||
5392 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5393 | ||
74ce6ce4 | 5394 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5395 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5396 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5397 | return; |
d7718a9d JA |
5398 | } |
5399 | ||
31067255 | 5400 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5401 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5402 | hash_del(&req->hash_node); |
2bae047e | 5403 | |
d4e7cd36 | 5404 | io_poll_remove_double(req); |
74ce6ce4 JA |
5405 | spin_unlock_irq(&ctx->completion_lock); |
5406 | ||
0be0b0e3 PB |
5407 | if (!READ_ONCE(apoll->poll.canceled)) |
5408 | __io_req_task_submit(req); | |
5409 | else | |
5410 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5411 | |
6d816e08 | 5412 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5413 | kfree(apoll->double_poll); |
31067255 | 5414 | kfree(apoll); |
d7718a9d JA |
5415 | } |
5416 | ||
5417 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5418 | void *key) | |
5419 | { | |
5420 | struct io_kiocb *req = wait->private; | |
5421 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5422 | ||
5423 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5424 | key_to_poll(key)); | |
5425 | ||
5426 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5427 | } | |
5428 | ||
5429 | static void io_poll_req_insert(struct io_kiocb *req) | |
5430 | { | |
5431 | struct io_ring_ctx *ctx = req->ctx; | |
5432 | struct hlist_head *list; | |
5433 | ||
5434 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5435 | hlist_add_head(&req->hash_node, list); | |
5436 | } | |
5437 | ||
5438 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5439 | struct io_poll_iocb *poll, | |
5440 | struct io_poll_table *ipt, __poll_t mask, | |
5441 | wait_queue_func_t wake_func) | |
5442 | __acquires(&ctx->completion_lock) | |
5443 | { | |
5444 | struct io_ring_ctx *ctx = req->ctx; | |
5445 | bool cancel = false; | |
5446 | ||
4d52f338 | 5447 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5448 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5449 | poll->file = req->file; |
18bceab1 | 5450 | poll->wait.private = req; |
d7718a9d JA |
5451 | |
5452 | ipt->pt._key = mask; | |
5453 | ipt->req = req; | |
5454 | ipt->error = -EINVAL; | |
5455 | ||
d7718a9d JA |
5456 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5457 | ||
5458 | spin_lock_irq(&ctx->completion_lock); | |
5459 | if (likely(poll->head)) { | |
5460 | spin_lock(&poll->head->lock); | |
5461 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5462 | if (ipt->error) | |
5463 | cancel = true; | |
5464 | ipt->error = 0; | |
5465 | mask = 0; | |
5466 | } | |
5467 | if (mask || ipt->error) | |
5468 | list_del_init(&poll->wait.entry); | |
5469 | else if (cancel) | |
5470 | WRITE_ONCE(poll->canceled, true); | |
5471 | else if (!poll->done) /* actually waiting for an event */ | |
5472 | io_poll_req_insert(req); | |
5473 | spin_unlock(&poll->head->lock); | |
5474 | } | |
5475 | ||
5476 | return mask; | |
5477 | } | |
5478 | ||
5479 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5480 | { | |
5481 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5482 | struct io_ring_ctx *ctx = req->ctx; | |
5483 | struct async_poll *apoll; | |
5484 | struct io_poll_table ipt; | |
5485 | __poll_t mask, ret; | |
9dab14b8 | 5486 | int rw; |
d7718a9d JA |
5487 | |
5488 | if (!req->file || !file_can_poll(req->file)) | |
5489 | return false; | |
24c74678 | 5490 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5491 | return false; |
9dab14b8 JA |
5492 | if (def->pollin) |
5493 | rw = READ; | |
5494 | else if (def->pollout) | |
5495 | rw = WRITE; | |
5496 | else | |
5497 | return false; | |
5498 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5499 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5500 | return false; |
5501 | ||
5502 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5503 | if (unlikely(!apoll)) | |
5504 | return false; | |
807abcb0 | 5505 | apoll->double_poll = NULL; |
d7718a9d JA |
5506 | |
5507 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5508 | req->apoll = apoll; |
d7718a9d | 5509 | |
8755d97a | 5510 | mask = 0; |
d7718a9d | 5511 | if (def->pollin) |
8755d97a | 5512 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5513 | if (def->pollout) |
5514 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5515 | |
5516 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5517 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5518 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5519 | mask &= ~POLLIN; | |
5520 | ||
d7718a9d JA |
5521 | mask |= POLLERR | POLLPRI; |
5522 | ||
5523 | ipt.pt._qproc = io_async_queue_proc; | |
5524 | ||
5525 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5526 | io_async_wake); | |
a36da65c | 5527 | if (ret || ipt.error) { |
d4e7cd36 | 5528 | io_poll_remove_double(req); |
d7718a9d | 5529 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5530 | kfree(apoll->double_poll); |
d7718a9d JA |
5531 | kfree(apoll); |
5532 | return false; | |
5533 | } | |
5534 | spin_unlock_irq(&ctx->completion_lock); | |
5535 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5536 | apoll->poll.events); | |
5537 | return true; | |
5538 | } | |
5539 | ||
5540 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5541 | struct io_poll_iocb *poll) | |
221c5eb2 | 5542 | { |
b41e9852 | 5543 | bool do_complete = false; |
221c5eb2 JA |
5544 | |
5545 | spin_lock(&poll->head->lock); | |
5546 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5547 | if (!list_empty(&poll->wait.entry)) { |
5548 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5549 | do_complete = true; |
221c5eb2 JA |
5550 | } |
5551 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5552 | hash_del(&req->hash_node); |
d7718a9d JA |
5553 | return do_complete; |
5554 | } | |
5555 | ||
5556 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5557 | { | |
5558 | bool do_complete; | |
5559 | ||
d4e7cd36 JA |
5560 | io_poll_remove_double(req); |
5561 | ||
d7718a9d JA |
5562 | if (req->opcode == IORING_OP_POLL_ADD) { |
5563 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5564 | } else { | |
3bfa5bcb JA |
5565 | struct async_poll *apoll = req->apoll; |
5566 | ||
d7718a9d | 5567 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5568 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5569 | if (do_complete) { | |
d7718a9d | 5570 | io_put_req(req); |
807abcb0 | 5571 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5572 | kfree(apoll); |
5573 | } | |
b1f573bd XW |
5574 | } |
5575 | ||
b41e9852 JA |
5576 | if (do_complete) { |
5577 | io_cqring_fill_event(req, -ECANCELED); | |
5578 | io_commit_cqring(req->ctx); | |
f254ac04 | 5579 | req_set_fail_links(req); |
216578e5 | 5580 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5581 | } |
5582 | ||
5583 | return do_complete; | |
221c5eb2 JA |
5584 | } |
5585 | ||
76e1b642 JA |
5586 | /* |
5587 | * Returns true if we found and killed one or more poll requests | |
5588 | */ | |
6b81928d PB |
5589 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5590 | struct files_struct *files) | |
221c5eb2 | 5591 | { |
78076bb6 | 5592 | struct hlist_node *tmp; |
221c5eb2 | 5593 | struct io_kiocb *req; |
8e2e1faf | 5594 | int posted = 0, i; |
221c5eb2 JA |
5595 | |
5596 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5597 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5598 | struct hlist_head *list; | |
5599 | ||
5600 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5601 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5602 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5603 | posted += io_poll_remove_one(req); |
5604 | } | |
221c5eb2 JA |
5605 | } |
5606 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5607 | |
8e2e1faf JA |
5608 | if (posted) |
5609 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5610 | |
5611 | return posted != 0; | |
221c5eb2 JA |
5612 | } |
5613 | ||
47f46768 JA |
5614 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5615 | { | |
78076bb6 | 5616 | struct hlist_head *list; |
47f46768 JA |
5617 | struct io_kiocb *req; |
5618 | ||
78076bb6 JA |
5619 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5620 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5621 | if (sqe_addr != req->user_data) |
5622 | continue; | |
5623 | if (io_poll_remove_one(req)) | |
eac406c6 | 5624 | return 0; |
b41e9852 | 5625 | return -EALREADY; |
47f46768 JA |
5626 | } |
5627 | ||
5628 | return -ENOENT; | |
5629 | } | |
5630 | ||
3529d8c2 JA |
5631 | static int io_poll_remove_prep(struct io_kiocb *req, |
5632 | const struct io_uring_sqe *sqe) | |
0969e783 | 5633 | { |
0969e783 JA |
5634 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5635 | return -EINVAL; | |
5636 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5637 | sqe->poll_events) | |
5638 | return -EINVAL; | |
5639 | ||
018043be | 5640 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5641 | return 0; |
5642 | } | |
5643 | ||
221c5eb2 JA |
5644 | /* |
5645 | * Find a running poll command that matches one specified in sqe->addr, | |
5646 | * and remove it if found. | |
5647 | */ | |
61e98203 | 5648 | static int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) |
221c5eb2 JA |
5649 | { |
5650 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5651 | int ret; |
221c5eb2 | 5652 | |
221c5eb2 | 5653 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5654 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5655 | spin_unlock_irq(&ctx->completion_lock); |
5656 | ||
4e88d6e7 JA |
5657 | if (ret < 0) |
5658 | req_set_fail_links(req); | |
e1e16097 | 5659 | io_req_complete(req, ret); |
221c5eb2 JA |
5660 | return 0; |
5661 | } | |
5662 | ||
221c5eb2 JA |
5663 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5664 | void *key) | |
5665 | { | |
c2f2eb7d JA |
5666 | struct io_kiocb *req = wait->private; |
5667 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5668 | |
d7718a9d | 5669 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5670 | } |
5671 | ||
221c5eb2 JA |
5672 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5673 | struct poll_table_struct *p) | |
5674 | { | |
5675 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5676 | ||
e8c2bc1f | 5677 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5678 | } |
5679 | ||
3529d8c2 | 5680 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5681 | { |
5682 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5683 | u32 events; |
221c5eb2 JA |
5684 | |
5685 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5686 | return -EINVAL; | |
5687 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5688 | return -EINVAL; | |
5689 | ||
5769a351 JX |
5690 | events = READ_ONCE(sqe->poll32_events); |
5691 | #ifdef __BIG_ENDIAN | |
5692 | events = swahw32(events); | |
5693 | #endif | |
a31eb4a2 JX |
5694 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5695 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5696 | return 0; |
5697 | } | |
5698 | ||
61e98203 | 5699 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5700 | { |
5701 | struct io_poll_iocb *poll = &req->poll; | |
5702 | struct io_ring_ctx *ctx = req->ctx; | |
5703 | struct io_poll_table ipt; | |
0969e783 | 5704 | __poll_t mask; |
0969e783 | 5705 | |
d7718a9d | 5706 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5707 | |
d7718a9d JA |
5708 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5709 | io_poll_wake); | |
221c5eb2 | 5710 | |
8c838788 | 5711 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5712 | ipt.error = 0; |
b0dd8a41 | 5713 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5714 | } |
221c5eb2 JA |
5715 | spin_unlock_irq(&ctx->completion_lock); |
5716 | ||
8c838788 JA |
5717 | if (mask) { |
5718 | io_cqring_ev_posted(ctx); | |
014db007 | 5719 | io_put_req(req); |
221c5eb2 | 5720 | } |
8c838788 | 5721 | return ipt.error; |
221c5eb2 JA |
5722 | } |
5723 | ||
5262f567 JA |
5724 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5725 | { | |
ad8a48ac JA |
5726 | struct io_timeout_data *data = container_of(timer, |
5727 | struct io_timeout_data, timer); | |
5728 | struct io_kiocb *req = data->req; | |
5729 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5730 | unsigned long flags; |
5731 | ||
5262f567 | 5732 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5733 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5734 | atomic_set(&req->ctx->cq_timeouts, |
5735 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5736 | ||
78e19bbe | 5737 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5738 | io_commit_cqring(ctx); |
5739 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5740 | ||
5741 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5742 | req_set_fail_links(req); |
5262f567 JA |
5743 | io_put_req(req); |
5744 | return HRTIMER_NORESTART; | |
5745 | } | |
5746 | ||
fbd15848 PB |
5747 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5748 | __u64 user_data) | |
f254ac04 | 5749 | { |
fbd15848 | 5750 | struct io_timeout_data *io; |
47f46768 JA |
5751 | struct io_kiocb *req; |
5752 | int ret = -ENOENT; | |
f254ac04 | 5753 | |
135fcde8 | 5754 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5755 | if (user_data == req->user_data) { |
47f46768 JA |
5756 | ret = 0; |
5757 | break; | |
5758 | } | |
5759 | } | |
5760 | ||
5761 | if (ret == -ENOENT) | |
fbd15848 PB |
5762 | return ERR_PTR(ret); |
5763 | ||
5764 | io = req->async_data; | |
e8c2bc1f | 5765 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 | 5766 | if (ret == -1) |
fbd15848 | 5767 | return ERR_PTR(-EALREADY); |
a71976f3 | 5768 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5769 | return req; |
5770 | } | |
47f46768 | 5771 | |
fbd15848 PB |
5772 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5773 | { | |
5774 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5775 | ||
5776 | if (IS_ERR(req)) | |
5777 | return PTR_ERR(req); | |
f254ac04 JA |
5778 | |
5779 | req_set_fail_links(req); | |
f254ac04 | 5780 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5781 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5782 | return 0; |
5783 | } | |
5784 | ||
9c8e11b3 PB |
5785 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5786 | struct timespec64 *ts, enum hrtimer_mode mode) | |
47f46768 | 5787 | { |
9c8e11b3 PB |
5788 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5789 | struct io_timeout_data *data; | |
47f46768 | 5790 | |
9c8e11b3 PB |
5791 | if (IS_ERR(req)) |
5792 | return PTR_ERR(req); | |
47f46768 | 5793 | |
9c8e11b3 PB |
5794 | req->timeout.off = 0; /* noseq */ |
5795 | data = req->async_data; | |
5796 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5797 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5798 | data->timer.function = io_timeout_fn; | |
5799 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5800 | return 0; | |
47f46768 JA |
5801 | } |
5802 | ||
3529d8c2 JA |
5803 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5804 | const struct io_uring_sqe *sqe) | |
b29472ee | 5805 | { |
9c8e11b3 PB |
5806 | struct io_timeout_rem *tr = &req->timeout_rem; |
5807 | ||
b29472ee JA |
5808 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5809 | return -EINVAL; | |
61710e43 DA |
5810 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5811 | return -EINVAL; | |
9c8e11b3 | 5812 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5813 | return -EINVAL; |
5814 | ||
9c8e11b3 PB |
5815 | tr->addr = READ_ONCE(sqe->addr); |
5816 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5817 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5818 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5819 | return -EINVAL; | |
5820 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5821 | return -EFAULT; | |
5822 | } else if (tr->flags) { | |
5823 | /* timeout removal doesn't support flags */ | |
b29472ee | 5824 | return -EINVAL; |
9c8e11b3 | 5825 | } |
b29472ee | 5826 | |
b29472ee JA |
5827 | return 0; |
5828 | } | |
5829 | ||
8662daec PB |
5830 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5831 | { | |
5832 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5833 | : HRTIMER_MODE_REL; | |
5834 | } | |
5835 | ||
11365043 JA |
5836 | /* |
5837 | * Remove or update an existing timeout command | |
5838 | */ | |
61e98203 | 5839 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5840 | { |
9c8e11b3 | 5841 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5842 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5843 | int ret; |
11365043 | 5844 | |
11365043 | 5845 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5846 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5847 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5848 | else |
5849 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5850 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5851 | |
47f46768 | 5852 | io_cqring_fill_event(req, ret); |
11365043 JA |
5853 | io_commit_cqring(ctx); |
5854 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5855 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5856 | if (ret < 0) |
5857 | req_set_fail_links(req); | |
ec9c02ad | 5858 | io_put_req(req); |
11365043 | 5859 | return 0; |
5262f567 JA |
5860 | } |
5861 | ||
3529d8c2 | 5862 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5863 | bool is_timeout_link) |
5262f567 | 5864 | { |
ad8a48ac | 5865 | struct io_timeout_data *data; |
a41525ab | 5866 | unsigned flags; |
56080b02 | 5867 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5868 | |
ad8a48ac | 5869 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5870 | return -EINVAL; |
ad8a48ac | 5871 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5872 | return -EINVAL; |
56080b02 | 5873 | if (off && is_timeout_link) |
2d28390a | 5874 | return -EINVAL; |
a41525ab JA |
5875 | flags = READ_ONCE(sqe->timeout_flags); |
5876 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5877 | return -EINVAL; |
bdf20073 | 5878 | |
bfe68a22 | 5879 | req->timeout.off = off; |
26a61679 | 5880 | |
e8c2bc1f | 5881 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5882 | return -ENOMEM; |
5883 | ||
e8c2bc1f | 5884 | data = req->async_data; |
ad8a48ac | 5885 | data->req = req; |
ad8a48ac JA |
5886 | |
5887 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5888 | return -EFAULT; |
5889 | ||
8662daec | 5890 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac JA |
5891 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5892 | return 0; | |
5893 | } | |
5894 | ||
61e98203 | 5895 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5896 | { |
ad8a48ac | 5897 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5898 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5899 | struct list_head *entry; |
bfe68a22 | 5900 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5901 | |
733f5c95 | 5902 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5903 | |
5262f567 JA |
5904 | /* |
5905 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5906 | * timeout event to be satisfied. If it isn't set, then this is |
5907 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5908 | */ |
8eb7e2d0 | 5909 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5910 | entry = ctx->timeout_list.prev; |
5911 | goto add; | |
5912 | } | |
5262f567 | 5913 | |
bfe68a22 PB |
5914 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5915 | req->timeout.target_seq = tail + off; | |
5262f567 | 5916 | |
f010505b MDG |
5917 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5918 | * This is safe because ->completion_lock is held, and submissions | |
5919 | * and completions are never mixed in the same ->completion_lock section. | |
5920 | */ | |
5921 | ctx->cq_last_tm_flush = tail; | |
5922 | ||
5262f567 JA |
5923 | /* |
5924 | * Insertion sort, ensuring the first entry in the list is always | |
5925 | * the one we need first. | |
5926 | */ | |
5262f567 | 5927 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5928 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5929 | timeout.list); | |
5262f567 | 5930 | |
8eb7e2d0 | 5931 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5932 | continue; |
bfe68a22 PB |
5933 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5934 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5935 | break; |
5936 | } | |
93bd25bb | 5937 | add: |
135fcde8 | 5938 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5939 | data->timer.function = io_timeout_fn; |
5940 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5941 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5942 | return 0; |
5943 | } | |
5262f567 | 5944 | |
62755e35 JA |
5945 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5946 | { | |
5947 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5948 | ||
5949 | return req->user_data == (unsigned long) data; | |
5950 | } | |
5951 | ||
e977d6d3 | 5952 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5953 | { |
62755e35 | 5954 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5955 | int ret = 0; |
5956 | ||
4f26bda1 | 5957 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5958 | switch (cancel_ret) { |
5959 | case IO_WQ_CANCEL_OK: | |
5960 | ret = 0; | |
5961 | break; | |
5962 | case IO_WQ_CANCEL_RUNNING: | |
5963 | ret = -EALREADY; | |
5964 | break; | |
5965 | case IO_WQ_CANCEL_NOTFOUND: | |
5966 | ret = -ENOENT; | |
5967 | break; | |
5968 | } | |
5969 | ||
e977d6d3 JA |
5970 | return ret; |
5971 | } | |
5972 | ||
47f46768 JA |
5973 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5974 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5975 | int success_ret) |
47f46768 JA |
5976 | { |
5977 | unsigned long flags; | |
5978 | int ret; | |
5979 | ||
5980 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5981 | if (ret != -ENOENT) { | |
5982 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5983 | goto done; | |
5984 | } | |
5985 | ||
5986 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5987 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5988 | if (ret != -ENOENT) | |
5989 | goto done; | |
5990 | ret = io_poll_cancel(ctx, sqe_addr); | |
5991 | done: | |
b0dd8a41 JA |
5992 | if (!ret) |
5993 | ret = success_ret; | |
47f46768 JA |
5994 | io_cqring_fill_event(req, ret); |
5995 | io_commit_cqring(ctx); | |
5996 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5997 | io_cqring_ev_posted(ctx); | |
5998 | ||
4e88d6e7 JA |
5999 | if (ret < 0) |
6000 | req_set_fail_links(req); | |
014db007 | 6001 | io_put_req(req); |
47f46768 JA |
6002 | } |
6003 | ||
3529d8c2 JA |
6004 | static int io_async_cancel_prep(struct io_kiocb *req, |
6005 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6006 | { |
fbf23849 | 6007 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6008 | return -EINVAL; |
61710e43 DA |
6009 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6010 | return -EINVAL; | |
6011 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
6012 | return -EINVAL; |
6013 | ||
fbf23849 JA |
6014 | req->cancel.addr = READ_ONCE(sqe->addr); |
6015 | return 0; | |
6016 | } | |
6017 | ||
61e98203 | 6018 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6019 | { |
6020 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 6021 | |
014db007 | 6022 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
6023 | return 0; |
6024 | } | |
6025 | ||
269bbe5f | 6026 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6027 | const struct io_uring_sqe *sqe) |
6028 | { | |
6ca56f84 JA |
6029 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
6030 | return -EINVAL; | |
61710e43 DA |
6031 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6032 | return -EINVAL; | |
6033 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
6034 | return -EINVAL; |
6035 | ||
269bbe5f BM |
6036 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6037 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6038 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6039 | return -EINVAL; |
269bbe5f | 6040 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6041 | return 0; |
6042 | } | |
6043 | ||
889fca73 | 6044 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6045 | { |
6046 | struct io_ring_ctx *ctx = req->ctx; | |
269bbe5f | 6047 | struct io_uring_rsrc_update up; |
05f3fb3c | 6048 | int ret; |
fbf23849 | 6049 | |
45d189c6 | 6050 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 6051 | return -EAGAIN; |
05f3fb3c | 6052 | |
269bbe5f BM |
6053 | up.offset = req->rsrc_update.offset; |
6054 | up.data = req->rsrc_update.arg; | |
05f3fb3c JA |
6055 | |
6056 | mutex_lock(&ctx->uring_lock); | |
269bbe5f | 6057 | ret = __io_sqe_files_update(ctx, &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
6058 | mutex_unlock(&ctx->uring_lock); |
6059 | ||
6060 | if (ret < 0) | |
6061 | req_set_fail_links(req); | |
889fca73 | 6062 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6063 | return 0; |
6064 | } | |
6065 | ||
bfe76559 | 6066 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6067 | { |
d625c6ee | 6068 | switch (req->opcode) { |
e781573e | 6069 | case IORING_OP_NOP: |
bfe76559 | 6070 | return 0; |
f67676d1 JA |
6071 | case IORING_OP_READV: |
6072 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6073 | case IORING_OP_READ: |
bfe76559 | 6074 | return io_read_prep(req, sqe); |
f67676d1 JA |
6075 | case IORING_OP_WRITEV: |
6076 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6077 | case IORING_OP_WRITE: |
bfe76559 | 6078 | return io_write_prep(req, sqe); |
0969e783 | 6079 | case IORING_OP_POLL_ADD: |
bfe76559 | 6080 | return io_poll_add_prep(req, sqe); |
0969e783 | 6081 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 6082 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 6083 | case IORING_OP_FSYNC: |
bfe76559 | 6084 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 6085 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 6086 | return io_prep_sfr(req, sqe); |
03b1230c | 6087 | case IORING_OP_SENDMSG: |
fddaface | 6088 | case IORING_OP_SEND: |
bfe76559 | 6089 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6090 | case IORING_OP_RECVMSG: |
fddaface | 6091 | case IORING_OP_RECV: |
bfe76559 | 6092 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6093 | case IORING_OP_CONNECT: |
bfe76559 | 6094 | return io_connect_prep(req, sqe); |
2d28390a | 6095 | case IORING_OP_TIMEOUT: |
bfe76559 | 6096 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6097 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6098 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6099 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6100 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6101 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6102 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6103 | case IORING_OP_ACCEPT: |
bfe76559 | 6104 | return io_accept_prep(req, sqe); |
d63d1b5e | 6105 | case IORING_OP_FALLOCATE: |
bfe76559 | 6106 | return io_fallocate_prep(req, sqe); |
15b71abe | 6107 | case IORING_OP_OPENAT: |
bfe76559 | 6108 | return io_openat_prep(req, sqe); |
b5dba59e | 6109 | case IORING_OP_CLOSE: |
bfe76559 | 6110 | return io_close_prep(req, sqe); |
05f3fb3c | 6111 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6112 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6113 | case IORING_OP_STATX: |
bfe76559 | 6114 | return io_statx_prep(req, sqe); |
4840e418 | 6115 | case IORING_OP_FADVISE: |
bfe76559 | 6116 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6117 | case IORING_OP_MADVISE: |
bfe76559 | 6118 | return io_madvise_prep(req, sqe); |
cebdb986 | 6119 | case IORING_OP_OPENAT2: |
bfe76559 | 6120 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6121 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6122 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6123 | case IORING_OP_SPLICE: |
bfe76559 | 6124 | return io_splice_prep(req, sqe); |
ddf0322d | 6125 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6126 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6127 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6128 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6129 | case IORING_OP_TEE: |
bfe76559 | 6130 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6131 | case IORING_OP_SHUTDOWN: |
6132 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6133 | case IORING_OP_RENAMEAT: |
6134 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6135 | case IORING_OP_UNLINKAT: |
6136 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
6137 | } |
6138 | ||
bfe76559 PB |
6139 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6140 | req->opcode); | |
6141 | return-EINVAL; | |
6142 | } | |
6143 | ||
6144 | static int io_req_defer_prep(struct io_kiocb *req, | |
6145 | const struct io_uring_sqe *sqe) | |
6146 | { | |
bfe76559 PB |
6147 | if (!sqe) |
6148 | return 0; | |
6149 | if (io_alloc_async_data(req)) | |
6150 | return -EAGAIN; | |
bfe76559 | 6151 | return io_req_prep(req, sqe); |
f67676d1 JA |
6152 | } |
6153 | ||
9cf7c104 PB |
6154 | static u32 io_get_sequence(struct io_kiocb *req) |
6155 | { | |
6156 | struct io_kiocb *pos; | |
6157 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 6158 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 6159 | |
f2f87370 PB |
6160 | io_for_each_link(pos, req) |
6161 | nr_reqs++; | |
9cf7c104 PB |
6162 | |
6163 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
6164 | return total_submitted - nr_reqs; | |
6165 | } | |
6166 | ||
3529d8c2 | 6167 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6168 | { |
a197f664 | 6169 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6170 | struct io_defer_entry *de; |
f67676d1 | 6171 | int ret; |
9cf7c104 | 6172 | u32 seq; |
de0617e4 | 6173 | |
9d858b21 | 6174 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6175 | if (likely(list_empty_careful(&ctx->defer_list) && |
6176 | !(req->flags & REQ_F_IO_DRAIN))) | |
6177 | return 0; | |
6178 | ||
6179 | seq = io_get_sequence(req); | |
6180 | /* Still a chance to pass the sequence check */ | |
6181 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6182 | return 0; |
6183 | ||
e8c2bc1f | 6184 | if (!req->async_data) { |
650b5481 | 6185 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6186 | if (ret) |
650b5481 PB |
6187 | return ret; |
6188 | } | |
cbdcb435 | 6189 | io_prep_async_link(req); |
27dc8338 PB |
6190 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6191 | if (!de) | |
6192 | return -ENOMEM; | |
2d28390a | 6193 | |
de0617e4 | 6194 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6195 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6196 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6197 | kfree(de); |
ae34817b PB |
6198 | io_queue_async_work(req); |
6199 | return -EIOCBQUEUED; | |
de0617e4 JA |
6200 | } |
6201 | ||
915967f6 | 6202 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6203 | de->req = req; |
9cf7c104 | 6204 | de->seq = seq; |
27dc8338 | 6205 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6206 | spin_unlock_irq(&ctx->completion_lock); |
6207 | return -EIOCBQUEUED; | |
6208 | } | |
6209 | ||
3ca405eb | 6210 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6211 | { |
0e1b6fe3 PB |
6212 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6213 | switch (req->opcode) { | |
6214 | case IORING_OP_READV: | |
6215 | case IORING_OP_READ_FIXED: | |
6216 | case IORING_OP_READ: | |
bcda7baa | 6217 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6218 | break; |
6219 | case IORING_OP_RECVMSG: | |
6220 | case IORING_OP_RECV: | |
bcda7baa | 6221 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6222 | break; |
6223 | } | |
6224 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6225 | } |
6226 | ||
0e1b6fe3 PB |
6227 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6228 | switch (req->opcode) { | |
6229 | case IORING_OP_READV: | |
6230 | case IORING_OP_READ_FIXED: | |
6231 | case IORING_OP_READ: | |
6232 | case IORING_OP_WRITEV: | |
6233 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6234 | case IORING_OP_WRITE: { |
6235 | struct io_async_rw *io = req->async_data; | |
6236 | if (io->free_iovec) | |
6237 | kfree(io->free_iovec); | |
0e1b6fe3 | 6238 | break; |
e8c2bc1f | 6239 | } |
0e1b6fe3 | 6240 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6241 | case IORING_OP_SENDMSG: { |
6242 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6243 | |
6244 | kfree(io->free_iov); | |
0e1b6fe3 | 6245 | break; |
e8c2bc1f | 6246 | } |
0e1b6fe3 PB |
6247 | case IORING_OP_SPLICE: |
6248 | case IORING_OP_TEE: | |
6249 | io_put_file(req, req->splice.file_in, | |
6250 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6251 | break; | |
f3cd4850 JA |
6252 | case IORING_OP_OPENAT: |
6253 | case IORING_OP_OPENAT2: | |
6254 | if (req->open.filename) | |
6255 | putname(req->open.filename); | |
6256 | break; | |
80a261fd JA |
6257 | case IORING_OP_RENAMEAT: |
6258 | putname(req->rename.oldpath); | |
6259 | putname(req->rename.newpath); | |
6260 | break; | |
14a1143b JA |
6261 | case IORING_OP_UNLINKAT: |
6262 | putname(req->unlink.filename); | |
6263 | break; | |
0e1b6fe3 PB |
6264 | } |
6265 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6266 | } |
99bc4c38 PB |
6267 | } |
6268 | ||
889fca73 | 6269 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6270 | { |
a197f664 | 6271 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6272 | int ret; |
2b188cc1 | 6273 | |
d625c6ee | 6274 | switch (req->opcode) { |
2b188cc1 | 6275 | case IORING_OP_NOP: |
889fca73 | 6276 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6277 | break; |
6278 | case IORING_OP_READV: | |
edafccee | 6279 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6280 | case IORING_OP_READ: |
889fca73 | 6281 | ret = io_read(req, issue_flags); |
edafccee | 6282 | break; |
3529d8c2 | 6283 | case IORING_OP_WRITEV: |
edafccee | 6284 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6285 | case IORING_OP_WRITE: |
889fca73 | 6286 | ret = io_write(req, issue_flags); |
2b188cc1 | 6287 | break; |
c992fe29 | 6288 | case IORING_OP_FSYNC: |
45d189c6 | 6289 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6290 | break; |
221c5eb2 | 6291 | case IORING_OP_POLL_ADD: |
61e98203 | 6292 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6293 | break; |
6294 | case IORING_OP_POLL_REMOVE: | |
61e98203 | 6295 | ret = io_poll_remove(req, issue_flags); |
221c5eb2 | 6296 | break; |
5d17b4a4 | 6297 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6298 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6299 | break; |
0fa03c62 | 6300 | case IORING_OP_SENDMSG: |
889fca73 | 6301 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6302 | break; |
fddaface | 6303 | case IORING_OP_SEND: |
889fca73 | 6304 | ret = io_send(req, issue_flags); |
0fa03c62 | 6305 | break; |
aa1fa28f | 6306 | case IORING_OP_RECVMSG: |
889fca73 | 6307 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6308 | break; |
fddaface | 6309 | case IORING_OP_RECV: |
889fca73 | 6310 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6311 | break; |
5262f567 | 6312 | case IORING_OP_TIMEOUT: |
61e98203 | 6313 | ret = io_timeout(req, issue_flags); |
5262f567 | 6314 | break; |
11365043 | 6315 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6316 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6317 | break; |
17f2fe35 | 6318 | case IORING_OP_ACCEPT: |
889fca73 | 6319 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6320 | break; |
f8e85cf2 | 6321 | case IORING_OP_CONNECT: |
889fca73 | 6322 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6323 | break; |
62755e35 | 6324 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6325 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6326 | break; |
d63d1b5e | 6327 | case IORING_OP_FALLOCATE: |
45d189c6 | 6328 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6329 | break; |
15b71abe | 6330 | case IORING_OP_OPENAT: |
45d189c6 | 6331 | ret = io_openat(req, issue_flags); |
15b71abe | 6332 | break; |
b5dba59e | 6333 | case IORING_OP_CLOSE: |
889fca73 | 6334 | ret = io_close(req, issue_flags); |
b5dba59e | 6335 | break; |
05f3fb3c | 6336 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6337 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6338 | break; |
eddc7ef5 | 6339 | case IORING_OP_STATX: |
45d189c6 | 6340 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6341 | break; |
4840e418 | 6342 | case IORING_OP_FADVISE: |
45d189c6 | 6343 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6344 | break; |
c1ca757b | 6345 | case IORING_OP_MADVISE: |
45d189c6 | 6346 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6347 | break; |
cebdb986 | 6348 | case IORING_OP_OPENAT2: |
45d189c6 | 6349 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6350 | break; |
3e4827b0 | 6351 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6352 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6353 | break; |
7d67af2c | 6354 | case IORING_OP_SPLICE: |
45d189c6 | 6355 | ret = io_splice(req, issue_flags); |
7d67af2c | 6356 | break; |
ddf0322d | 6357 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6358 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6359 | break; |
067524e9 | 6360 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6361 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6362 | break; |
f2a8d5c7 | 6363 | case IORING_OP_TEE: |
45d189c6 | 6364 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6365 | break; |
36f4fa68 | 6366 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6367 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6368 | break; |
80a261fd | 6369 | case IORING_OP_RENAMEAT: |
45d189c6 | 6370 | ret = io_renameat(req, issue_flags); |
80a261fd | 6371 | break; |
14a1143b | 6372 | case IORING_OP_UNLINKAT: |
45d189c6 | 6373 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6374 | break; |
2b188cc1 JA |
6375 | default: |
6376 | ret = -EINVAL; | |
6377 | break; | |
6378 | } | |
6379 | ||
def596e9 JA |
6380 | if (ret) |
6381 | return ret; | |
6382 | ||
b532576e JA |
6383 | /* If the op doesn't have a file, we're not polling for it */ |
6384 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6385 | const bool in_async = io_wq_current_is_worker(); |
6386 | ||
11ba820b JA |
6387 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6388 | if (in_async) | |
6389 | mutex_lock(&ctx->uring_lock); | |
6390 | ||
2e9dbe90 | 6391 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6392 | |
6393 | if (in_async) | |
6394 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6395 | } |
6396 | ||
6397 | return 0; | |
2b188cc1 JA |
6398 | } |
6399 | ||
5280f7e5 | 6400 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6401 | { |
6402 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6403 | struct io_kiocb *timeout; |
561fb04a | 6404 | int ret = 0; |
2b188cc1 | 6405 | |
6df1db6b PB |
6406 | timeout = io_prep_linked_timeout(req); |
6407 | if (timeout) | |
6408 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6409 | |
4014d943 | 6410 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6411 | ret = -ECANCELED; |
31b51510 | 6412 | |
561fb04a | 6413 | if (!ret) { |
561fb04a | 6414 | do { |
889fca73 | 6415 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6416 | /* |
6417 | * We can get EAGAIN for polled IO even though we're | |
6418 | * forcing a sync submission from here, since we can't | |
6419 | * wait for request slots on the block side. | |
6420 | */ | |
6421 | if (ret != -EAGAIN) | |
6422 | break; | |
6423 | cond_resched(); | |
6424 | } while (1); | |
6425 | } | |
31b51510 | 6426 | |
561fb04a | 6427 | if (ret) { |
c07e6719 XW |
6428 | struct io_ring_ctx *lock_ctx = NULL; |
6429 | ||
6430 | if (req->ctx->flags & IORING_SETUP_IOPOLL) | |
6431 | lock_ctx = req->ctx; | |
6432 | ||
dad1b124 | 6433 | /* |
c07e6719 XW |
6434 | * io_iopoll_complete() does not hold completion_lock to |
6435 | * complete polled io, so here for polled io, we can not call | |
6436 | * io_req_complete() directly, otherwise there maybe concurrent | |
6437 | * access to cqring, defer_list, etc, which is not safe. Given | |
6438 | * that io_iopoll_complete() is always called under uring_lock, | |
6439 | * so here for polled io, we also get uring_lock to complete | |
6440 | * it. | |
dad1b124 | 6441 | */ |
c07e6719 XW |
6442 | if (lock_ctx) |
6443 | mutex_lock(&lock_ctx->uring_lock); | |
dad1b124 | 6444 | |
c07e6719 XW |
6445 | req_set_fail_links(req); |
6446 | io_req_complete(req, ret); | |
6447 | ||
6448 | if (lock_ctx) | |
6449 | mutex_unlock(&lock_ctx->uring_lock); | |
edafccee | 6450 | } |
2b188cc1 JA |
6451 | } |
6452 | ||
65e19f54 JA |
6453 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6454 | int index) | |
6455 | { | |
269bbe5f | 6456 | struct fixed_rsrc_table *table; |
65e19f54 | 6457 | |
05f3fb3c | 6458 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6459 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6460 | } |
6461 | ||
8371adf5 PB |
6462 | static struct file *io_file_get(struct io_submit_state *state, |
6463 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6464 | { |
a197f664 | 6465 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6466 | struct file *file; |
09bb8394 | 6467 | |
8da11c19 | 6468 | if (fixed) { |
479f517b | 6469 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6470 | return NULL; |
b7620121 | 6471 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6472 | file = io_file_from_index(ctx, fd); |
36f72fe2 | 6473 | io_set_resource_node(req); |
09bb8394 | 6474 | } else { |
c826bd7a | 6475 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6476 | file = __io_file_get(state, fd); |
09bb8394 JA |
6477 | } |
6478 | ||
ce3d5aae PB |
6479 | if (file && unlikely(file->f_op == &io_uring_fops)) |
6480 | io_req_track_inflight(req); | |
8371adf5 | 6481 | return file; |
09bb8394 JA |
6482 | } |
6483 | ||
2665abfd | 6484 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6485 | { |
ad8a48ac JA |
6486 | struct io_timeout_data *data = container_of(timer, |
6487 | struct io_timeout_data, timer); | |
90cd7e42 | 6488 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6489 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6490 | unsigned long flags; |
2665abfd JA |
6491 | |
6492 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6493 | prev = req->timeout.head; |
6494 | req->timeout.head = NULL; | |
2665abfd JA |
6495 | |
6496 | /* | |
6497 | * We don't expect the list to be empty, that will only happen if we | |
6498 | * race with the completion of the linked work. | |
6499 | */ | |
90cd7e42 | 6500 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6501 | io_remove_next_linked(prev); |
90cd7e42 PB |
6502 | else |
6503 | prev = NULL; | |
2665abfd JA |
6504 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6505 | ||
6506 | if (prev) { | |
4e88d6e7 | 6507 | req_set_fail_links(prev); |
014db007 | 6508 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6509 | io_put_req_deferred(prev, 1); |
47f46768 | 6510 | } else { |
9ae1f8dd PB |
6511 | io_req_complete_post(req, -ETIME, 0); |
6512 | io_put_req_deferred(req, 1); | |
2665abfd | 6513 | } |
2665abfd JA |
6514 | return HRTIMER_NORESTART; |
6515 | } | |
6516 | ||
7271ef3a | 6517 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6518 | { |
76a46e06 | 6519 | /* |
f2f87370 PB |
6520 | * If the back reference is NULL, then our linked request finished |
6521 | * before we got a chance to setup the timer | |
76a46e06 | 6522 | */ |
90cd7e42 | 6523 | if (req->timeout.head) { |
e8c2bc1f | 6524 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6525 | |
ad8a48ac JA |
6526 | data->timer.function = io_link_timeout_fn; |
6527 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6528 | data->mode); | |
2665abfd | 6529 | } |
7271ef3a JA |
6530 | } |
6531 | ||
6532 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6533 | { | |
6534 | struct io_ring_ctx *ctx = req->ctx; | |
6535 | ||
6536 | spin_lock_irq(&ctx->completion_lock); | |
6537 | __io_queue_linked_timeout(req); | |
76a46e06 | 6538 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6539 | |
2665abfd | 6540 | /* drop submission reference */ |
76a46e06 JA |
6541 | io_put_req(req); |
6542 | } | |
2665abfd | 6543 | |
ad8a48ac | 6544 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6545 | { |
f2f87370 | 6546 | struct io_kiocb *nxt = req->link; |
2665abfd | 6547 | |
f2f87370 PB |
6548 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6549 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6550 | return NULL; |
2665abfd | 6551 | |
90cd7e42 | 6552 | nxt->timeout.head = req; |
900fad45 | 6553 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6554 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6555 | return nxt; |
2665abfd JA |
6556 | } |
6557 | ||
c5eef2b9 | 6558 | static void __io_queue_sqe(struct io_kiocb *req) |
2b188cc1 | 6559 | { |
d3d7298d | 6560 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); |
193155c8 | 6561 | const struct cred *old_creds = NULL; |
c5eef2b9 | 6562 | int ret; |
2b188cc1 | 6563 | |
2e5aa6cb PB |
6564 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6565 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
d3d7298d PB |
6566 | req->work.identity->creds != current_cred()) |
6567 | old_creds = override_creds(req->work.identity->creds); | |
193155c8 | 6568 | |
c5eef2b9 | 6569 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
491381ce | 6570 | |
d3d7298d PB |
6571 | if (old_creds) |
6572 | revert_creds(old_creds); | |
6573 | ||
491381ce JA |
6574 | /* |
6575 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6576 | * doesn't support non-blocking read/write attempts | |
6577 | */ | |
24c74678 | 6578 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6579 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6580 | /* |
6581 | * Queued up for async execution, worker will release | |
6582 | * submit reference when the iocb is actually submitted. | |
6583 | */ | |
6584 | io_queue_async_work(req); | |
2b188cc1 | 6585 | } |
0d63c148 PB |
6586 | } else if (likely(!ret)) { |
6587 | /* drop submission reference */ | |
e342c807 | 6588 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6589 | struct io_ring_ctx *ctx = req->ctx; |
6590 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
6591 | ||
6dd0be1e | 6592 | cs->reqs[cs->nr++] = req; |
d3d7298d | 6593 | if (cs->nr == ARRAY_SIZE(cs->reqs)) |
c5eef2b9 | 6594 | io_submit_flush_completions(cs, ctx); |
9affd664 | 6595 | } else { |
d3d7298d | 6596 | io_put_req(req); |
0d63c148 PB |
6597 | } |
6598 | } else { | |
4e88d6e7 | 6599 | req_set_fail_links(req); |
e65ef56d | 6600 | io_put_req(req); |
e1e16097 | 6601 | io_req_complete(req, ret); |
9e645e11 | 6602 | } |
d3d7298d PB |
6603 | if (linked_timeout) |
6604 | io_queue_linked_timeout(linked_timeout); | |
2b188cc1 JA |
6605 | } |
6606 | ||
c5eef2b9 | 6607 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
6608 | { |
6609 | int ret; | |
6610 | ||
3529d8c2 | 6611 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6612 | if (ret) { |
6613 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6614 | fail_req: |
4e88d6e7 | 6615 | req_set_fail_links(req); |
e1e16097 JA |
6616 | io_put_req(req); |
6617 | io_req_complete(req, ret); | |
4fe2c963 | 6618 | } |
2550878f | 6619 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6620 | if (!req->async_data) { |
bd2ab18a | 6621 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6622 | if (unlikely(ret)) |
bd2ab18a PB |
6623 | goto fail_req; |
6624 | } | |
ce35a47a JA |
6625 | io_queue_async_work(req); |
6626 | } else { | |
c1379e24 PB |
6627 | if (sqe) { |
6628 | ret = io_req_prep(req, sqe); | |
6629 | if (unlikely(ret)) | |
6630 | goto fail_req; | |
6631 | } | |
c5eef2b9 | 6632 | __io_queue_sqe(req); |
ce35a47a | 6633 | } |
4fe2c963 JL |
6634 | } |
6635 | ||
c5eef2b9 | 6636 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 6637 | { |
94ae5e77 | 6638 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6639 | io_put_req(req); |
6640 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6641 | } else |
c5eef2b9 | 6642 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
6643 | } |
6644 | ||
863e0560 PB |
6645 | struct io_submit_link { |
6646 | struct io_kiocb *head; | |
6647 | struct io_kiocb *last; | |
6648 | }; | |
6649 | ||
1d4240cc | 6650 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
c5eef2b9 | 6651 | struct io_submit_link *link) |
9e645e11 | 6652 | { |
a197f664 | 6653 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6654 | int ret; |
9e645e11 | 6655 | |
9e645e11 JA |
6656 | /* |
6657 | * If we already have a head request, queue this one for async | |
6658 | * submittal once the head completes. If we don't have a head but | |
6659 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6660 | * submitted sync once the chain is complete. If none of those | |
6661 | * conditions are true (normal request), then just queue it. | |
6662 | */ | |
863e0560 PB |
6663 | if (link->head) { |
6664 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6665 | |
8cdf2193 PB |
6666 | /* |
6667 | * Taking sequential execution of a link, draining both sides | |
6668 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6669 | * requests in the link. So, it drains the head and the | |
6670 | * next after the link request. The last one is done via | |
6671 | * drain_next flag to persist the effect across calls. | |
6672 | */ | |
ef4ff581 | 6673 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6674 | head->flags |= REQ_F_IO_DRAIN; |
6675 | ctx->drain_next = 1; | |
6676 | } | |
3529d8c2 | 6677 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6678 | if (unlikely(ret)) { |
4e88d6e7 | 6679 | /* fail even hard links since we don't submit */ |
9d76377f | 6680 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6681 | return ret; |
2d28390a | 6682 | } |
9d76377f | 6683 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6684 | link->last->link = req; |
863e0560 | 6685 | link->last = req; |
32fe525b PB |
6686 | |
6687 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6688 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
c5eef2b9 | 6689 | io_queue_link_head(head); |
863e0560 | 6690 | link->head = NULL; |
32fe525b | 6691 | } |
9e645e11 | 6692 | } else { |
711be031 PB |
6693 | if (unlikely(ctx->drain_next)) { |
6694 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6695 | ctx->drain_next = 0; |
711be031 | 6696 | } |
ef4ff581 | 6697 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6698 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6699 | if (unlikely(ret)) |
711be031 | 6700 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6701 | link->head = req; |
6702 | link->last = req; | |
711be031 | 6703 | } else { |
c5eef2b9 | 6704 | io_queue_sqe(req, sqe); |
711be031 | 6705 | } |
9e645e11 | 6706 | } |
2e6e1fde | 6707 | |
1d4240cc | 6708 | return 0; |
9e645e11 JA |
6709 | } |
6710 | ||
9a56a232 JA |
6711 | /* |
6712 | * Batched submission is done, ensure local IO is flushed out. | |
6713 | */ | |
ba88ff11 PB |
6714 | static void io_submit_state_end(struct io_submit_state *state, |
6715 | struct io_ring_ctx *ctx) | |
9a56a232 | 6716 | { |
6dd0be1e | 6717 | if (state->comp.nr) |
ba88ff11 | 6718 | io_submit_flush_completions(&state->comp, ctx); |
27926b68 JA |
6719 | if (state->plug_started) |
6720 | blk_finish_plug(&state->plug); | |
9f13c35b | 6721 | io_state_file_put(state); |
9a56a232 JA |
6722 | } |
6723 | ||
6724 | /* | |
6725 | * Start submission side cache. | |
6726 | */ | |
6727 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6728 | unsigned int max_ios) |
9a56a232 | 6729 | { |
27926b68 | 6730 | state->plug_started = false; |
9a56a232 JA |
6731 | state->ios_left = max_ios; |
6732 | } | |
6733 | ||
2b188cc1 JA |
6734 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6735 | { | |
75b28aff | 6736 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6737 | |
caf582c6 PB |
6738 | /* |
6739 | * Ensure any loads from the SQEs are done at this point, | |
6740 | * since once we write the new head, the application could | |
6741 | * write new data to them. | |
6742 | */ | |
6743 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6744 | } |
6745 | ||
2b188cc1 | 6746 | /* |
3529d8c2 | 6747 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6748 | * that is mapped by userspace. This means that care needs to be taken to |
6749 | * ensure that reads are stable, as we cannot rely on userspace always | |
6750 | * being a good citizen. If members of the sqe are validated and then later | |
6751 | * used, it's important that those reads are done through READ_ONCE() to | |
6752 | * prevent a re-load down the line. | |
6753 | */ | |
709b302f | 6754 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6755 | { |
75b28aff | 6756 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6757 | unsigned head; |
6758 | ||
6759 | /* | |
6760 | * The cached sq head (or cq tail) serves two purposes: | |
6761 | * | |
6762 | * 1) allows us to batch the cost of updating the user visible | |
6763 | * head updates. | |
6764 | * 2) allows the kernel side to track the head on its own, even | |
6765 | * though the application is the one updating it. | |
6766 | */ | |
4fccfcbb | 6767 | head = READ_ONCE(sq_array[ctx->cached_sq_head++ & ctx->sq_mask]); |
709b302f PB |
6768 | if (likely(head < ctx->sq_entries)) |
6769 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6770 | |
6771 | /* drop invalid entries */ | |
498ccd9e | 6772 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6773 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6774 | return NULL; |
6775 | } | |
6776 | ||
21b55dbc SG |
6777 | /* |
6778 | * Check SQE restrictions (opcode and flags). | |
6779 | * | |
6780 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6781 | */ | |
6782 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6783 | struct io_kiocb *req, | |
6784 | unsigned int sqe_flags) | |
6785 | { | |
6786 | if (!ctx->restricted) | |
6787 | return true; | |
6788 | ||
6789 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6790 | return false; | |
6791 | ||
6792 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6793 | ctx->restrictions.sqe_flags_required) | |
6794 | return false; | |
6795 | ||
6796 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6797 | ctx->restrictions.sqe_flags_required)) | |
6798 | return false; | |
6799 | ||
6800 | return true; | |
6801 | } | |
6802 | ||
ef4ff581 PB |
6803 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6804 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6805 | IOSQE_BUFFER_SELECT) | |
6806 | ||
6807 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
258b29a9 | 6808 | const struct io_uring_sqe *sqe) |
0553b8bd | 6809 | { |
258b29a9 | 6810 | struct io_submit_state *state; |
ef4ff581 | 6811 | unsigned int sqe_flags; |
5be9ad1e | 6812 | int id, ret = 0; |
ef4ff581 | 6813 | |
0553b8bd | 6814 | req->opcode = READ_ONCE(sqe->opcode); |
5be9ad1e PB |
6815 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
6816 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
0553b8bd | 6817 | req->user_data = READ_ONCE(sqe->user_data); |
e8c2bc1f | 6818 | req->async_data = NULL; |
0553b8bd PB |
6819 | req->file = NULL; |
6820 | req->ctx = ctx; | |
f2f87370 | 6821 | req->link = NULL; |
269bbe5f | 6822 | req->fixed_rsrc_refs = NULL; |
0553b8bd PB |
6823 | /* one is dropped after submission, the other at completion */ |
6824 | refcount_set(&req->refs, 2); | |
4dd2824d | 6825 | req->task = current; |
0553b8bd | 6826 | req->result = 0; |
ef4ff581 | 6827 | |
5be9ad1e PB |
6828 | /* enforce forwards compatibility on users */ |
6829 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6830 | return -EINVAL; | |
6831 | ||
ef4ff581 PB |
6832 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
6833 | return -EINVAL; | |
6834 | ||
28cea78a | 6835 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6836 | return -EFAULT; |
ef4ff581 | 6837 | |
21b55dbc SG |
6838 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6839 | return -EACCES; | |
6840 | ||
ef4ff581 PB |
6841 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6842 | !io_op_defs[req->opcode].buffer_select) | |
6843 | return -EOPNOTSUPP; | |
6844 | ||
6845 | id = READ_ONCE(sqe->personality); | |
6846 | if (id) { | |
1e6fa521 JA |
6847 | struct io_identity *iod; |
6848 | ||
1e6fa521 JA |
6849 | iod = idr_find(&ctx->personality_idr, id); |
6850 | if (unlikely(!iod)) | |
ef4ff581 | 6851 | return -EINVAL; |
1e6fa521 | 6852 | refcount_inc(&iod->count); |
ec99ca6c PB |
6853 | |
6854 | __io_req_init_async(req); | |
1e6fa521 JA |
6855 | get_cred(iod->creds); |
6856 | req->work.identity = iod; | |
dfead8a8 | 6857 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6858 | } |
6859 | ||
258b29a9 | 6860 | state = &ctx->submit_state; |
ef4ff581 | 6861 | |
27926b68 JA |
6862 | /* |
6863 | * Plug now if we have more than 1 IO left after this, and the target | |
6864 | * is potentially a read/write to block based storage. | |
6865 | */ | |
6866 | if (!state->plug_started && state->ios_left > 1 && | |
6867 | io_op_defs[req->opcode].plug) { | |
6868 | blk_start_plug(&state->plug); | |
6869 | state->plug_started = true; | |
6870 | } | |
6871 | ||
bd5bbda7 PB |
6872 | if (io_op_defs[req->opcode].needs_file) { |
6873 | bool fixed = req->flags & REQ_F_FIXED_FILE; | |
6874 | ||
6875 | req->file = io_file_get(state, req, READ_ONCE(sqe->fd), fixed); | |
ba13e23f | 6876 | if (unlikely(!req->file)) |
bd5bbda7 PB |
6877 | ret = -EBADF; |
6878 | } | |
63ff8223 | 6879 | |
71b547c0 PB |
6880 | state->ios_left--; |
6881 | return ret; | |
0553b8bd PB |
6882 | } |
6883 | ||
0f212204 | 6884 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6885 | { |
863e0560 | 6886 | struct io_submit_link link; |
46c4e16a | 6887 | int submitted = 0; |
6c271ce2 | 6888 | |
c4a2ed72 | 6889 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 | 6890 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6c503150 | 6891 | if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6892 | return -EBUSY; |
6893 | } | |
6c271ce2 | 6894 | |
ee7d46d9 PB |
6895 | /* make sure SQ entry isn't read before tail */ |
6896 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6897 | |
2b85edfc PB |
6898 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6899 | return -EAGAIN; | |
6c271ce2 | 6900 | |
d8a6df10 | 6901 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6902 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6903 | |
ba88ff11 | 6904 | io_submit_state_start(&ctx->submit_state, nr); |
863e0560 | 6905 | link.head = NULL; |
b14cca0c | 6906 | |
46c4e16a | 6907 | while (submitted < nr) { |
3529d8c2 | 6908 | const struct io_uring_sqe *sqe; |
196be95c | 6909 | struct io_kiocb *req; |
1cb1edb2 | 6910 | int err; |
fb5ccc98 | 6911 | |
258b29a9 | 6912 | req = io_alloc_req(ctx); |
196be95c PB |
6913 | if (unlikely(!req)) { |
6914 | if (!submitted) | |
6915 | submitted = -EAGAIN; | |
fb5ccc98 | 6916 | break; |
196be95c | 6917 | } |
4fccfcbb PB |
6918 | sqe = io_get_sqe(ctx); |
6919 | if (unlikely(!sqe)) { | |
6920 | kmem_cache_free(req_cachep, req); | |
6921 | break; | |
6922 | } | |
d3656344 JA |
6923 | /* will complete beyond this point, count as submitted */ |
6924 | submitted++; | |
6925 | ||
258b29a9 | 6926 | err = io_init_req(ctx, req, sqe); |
ef4ff581 | 6927 | if (unlikely(err)) { |
1cb1edb2 | 6928 | fail_req: |
e1e16097 JA |
6929 | io_put_req(req); |
6930 | io_req_complete(req, err); | |
196be95c PB |
6931 | break; |
6932 | } | |
fb5ccc98 | 6933 | |
354420f7 | 6934 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
2d7e9358 | 6935 | true, ctx->flags & IORING_SETUP_SQPOLL); |
c5eef2b9 | 6936 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
6937 | if (err) |
6938 | goto fail_req; | |
6c271ce2 JA |
6939 | } |
6940 | ||
9466f437 PB |
6941 | if (unlikely(submitted != nr)) { |
6942 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6943 | struct io_uring_task *tctx = current->io_uring; |
6944 | int unused = nr - ref_used; | |
9466f437 | 6945 | |
d8a6df10 JA |
6946 | percpu_ref_put_many(&ctx->refs, unused); |
6947 | percpu_counter_sub(&tctx->inflight, unused); | |
6948 | put_task_struct_many(current, unused); | |
9466f437 | 6949 | } |
863e0560 | 6950 | if (link.head) |
c5eef2b9 | 6951 | io_queue_link_head(link.head); |
ba88ff11 | 6952 | io_submit_state_end(&ctx->submit_state, ctx); |
6c271ce2 | 6953 | |
ae9428ca PB |
6954 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6955 | io_commit_sqring(ctx); | |
6956 | ||
6c271ce2 JA |
6957 | return submitted; |
6958 | } | |
6959 | ||
23b3628e XW |
6960 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6961 | { | |
6962 | /* Tell userspace we may need a wakeup call */ | |
6963 | spin_lock_irq(&ctx->completion_lock); | |
6964 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6965 | spin_unlock_irq(&ctx->completion_lock); | |
6966 | } | |
6967 | ||
6968 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6969 | { | |
6970 | spin_lock_irq(&ctx->completion_lock); | |
6971 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6972 | spin_unlock_irq(&ctx->completion_lock); | |
6973 | } | |
6974 | ||
08369246 | 6975 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6976 | { |
c8d1ba58 | 6977 | unsigned int to_submit; |
bdcd3eab | 6978 | int ret = 0; |
6c271ce2 | 6979 | |
c8d1ba58 | 6980 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
6981 | /* if we're handling multiple rings, cap submit size for fairness */ |
6982 | if (cap_entries && to_submit > 8) | |
6983 | to_submit = 8; | |
6984 | ||
906a3c6f | 6985 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 6986 | unsigned nr_events = 0; |
a4c0b3de | 6987 | |
c8d1ba58 | 6988 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 6989 | if (!list_empty(&ctx->iopoll_list)) |
c8d1ba58 | 6990 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 6991 | |
d9d05217 PB |
6992 | if (to_submit && !ctx->sqo_dead && |
6993 | likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 | 6994 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 JA |
6995 | mutex_unlock(&ctx->uring_lock); |
6996 | } | |
6c271ce2 | 6997 | |
90554200 JA |
6998 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) |
6999 | wake_up(&ctx->sqo_sq_wait); | |
6c271ce2 | 7000 | |
08369246 XW |
7001 | return ret; |
7002 | } | |
6c271ce2 | 7003 | |
08369246 XW |
7004 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7005 | { | |
7006 | struct io_ring_ctx *ctx; | |
7007 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7008 | |
08369246 XW |
7009 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7010 | if (sq_thread_idle < ctx->sq_thread_idle) | |
7011 | sq_thread_idle = ctx->sq_thread_idle; | |
c8d1ba58 | 7012 | } |
c1edbf5f | 7013 | |
08369246 | 7014 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7015 | } |
6c271ce2 | 7016 | |
69fb2131 JA |
7017 | static void io_sqd_init_new(struct io_sq_data *sqd) |
7018 | { | |
7019 | struct io_ring_ctx *ctx; | |
7020 | ||
7021 | while (!list_empty(&sqd->ctx_new_list)) { | |
7022 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
7023 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
7024 | complete(&ctx->sq_thread_comp); | |
7025 | } | |
08369246 XW |
7026 | |
7027 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
7028 | } |
7029 | ||
c8d1ba58 JA |
7030 | static int io_sq_thread(void *data) |
7031 | { | |
91d8f519 | 7032 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
7033 | struct files_struct *old_files = current->files; |
7034 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
7035 | const struct cred *old_cred = NULL; |
7036 | struct io_sq_data *sqd = data; | |
7037 | struct io_ring_ctx *ctx; | |
a0d9205f | 7038 | unsigned long timeout = 0; |
08369246 | 7039 | DEFINE_WAIT(wait); |
6c271ce2 | 7040 | |
28cea78a JA |
7041 | task_lock(current); |
7042 | current->files = NULL; | |
7043 | current->nsproxy = NULL; | |
7044 | task_unlock(current); | |
6c271ce2 | 7045 | |
69fb2131 | 7046 | while (!kthread_should_stop()) { |
08369246 XW |
7047 | int ret; |
7048 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
7049 | |
7050 | /* | |
69fb2131 JA |
7051 | * Any changes to the sqd lists are synchronized through the |
7052 | * kthread parking. This synchronizes the thread vs users, | |
7053 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 7054 | */ |
65b2b213 | 7055 | if (kthread_should_park()) { |
69fb2131 | 7056 | kthread_parkme(); |
65b2b213 XW |
7057 | /* |
7058 | * When sq thread is unparked, in case the previous park operation | |
7059 | * comes from io_put_sq_data(), which means that sq thread is going | |
7060 | * to be stopped, so here needs to have a check. | |
7061 | */ | |
7062 | if (kthread_should_stop()) | |
7063 | break; | |
7064 | } | |
7143b5ac | 7065 | |
08369246 | 7066 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 7067 | io_sqd_init_new(sqd); |
08369246 XW |
7068 | timeout = jiffies + sqd->sq_thread_idle; |
7069 | } | |
6c271ce2 | 7070 | |
08369246 | 7071 | sqt_spin = false; |
e95eee2d | 7072 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
7073 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7074 | if (current->cred != ctx->creds) { | |
7075 | if (old_cred) | |
7076 | revert_creds(old_cred); | |
7077 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7078 | } |
91d8f519 | 7079 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7080 | #ifdef CONFIG_AUDIT |
7081 | current->loginuid = ctx->loginuid; | |
7082 | current->sessionid = ctx->sessionid; | |
7083 | #endif | |
bdcd3eab | 7084 | |
08369246 XW |
7085 | ret = __io_sq_thread(ctx, cap_entries); |
7086 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
7087 | sqt_spin = true; | |
6c271ce2 | 7088 | |
28cea78a | 7089 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7090 | } |
6c271ce2 | 7091 | |
08369246 | 7092 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7093 | io_run_task_work(); |
d434ab6d | 7094 | io_sq_thread_drop_mm_files(); |
c8d1ba58 | 7095 | cond_resched(); |
08369246 XW |
7096 | if (sqt_spin) |
7097 | timeout = jiffies + sqd->sq_thread_idle; | |
7098 | continue; | |
7099 | } | |
7100 | ||
08369246 XW |
7101 | needs_sched = true; |
7102 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
7103 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
7104 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
7105 | !list_empty_careful(&ctx->iopoll_list)) { | |
7106 | needs_sched = false; | |
7107 | break; | |
7108 | } | |
7109 | if (io_sqring_entries(ctx)) { | |
7110 | needs_sched = false; | |
7111 | break; | |
7112 | } | |
7113 | } | |
7114 | ||
8b28fdf2 | 7115 | if (needs_sched && !kthread_should_park()) { |
69fb2131 JA |
7116 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7117 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 7118 | |
69fb2131 | 7119 | schedule(); |
69fb2131 JA |
7120 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7121 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7122 | } |
08369246 XW |
7123 | |
7124 | finish_wait(&sqd->wait, &wait); | |
7125 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
7126 | } |
7127 | ||
4c6e277c | 7128 | io_run_task_work(); |
d434ab6d | 7129 | io_sq_thread_drop_mm_files(); |
b41e9852 | 7130 | |
91d8f519 DZ |
7131 | if (cur_css) |
7132 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7133 | if (old_cred) |
7134 | revert_creds(old_cred); | |
06058632 | 7135 | |
28cea78a JA |
7136 | task_lock(current); |
7137 | current->files = old_files; | |
7138 | current->nsproxy = old_nsproxy; | |
7139 | task_unlock(current); | |
7140 | ||
2bbcd6d3 | 7141 | kthread_parkme(); |
06058632 | 7142 | |
6c271ce2 JA |
7143 | return 0; |
7144 | } | |
7145 | ||
bda52162 JA |
7146 | struct io_wait_queue { |
7147 | struct wait_queue_entry wq; | |
7148 | struct io_ring_ctx *ctx; | |
7149 | unsigned to_wait; | |
7150 | unsigned nr_timeouts; | |
7151 | }; | |
7152 | ||
6c503150 | 7153 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7154 | { |
7155 | struct io_ring_ctx *ctx = iowq->ctx; | |
7156 | ||
7157 | /* | |
d195a66e | 7158 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7159 | * started waiting. For timeouts, we always want to return to userspace, |
7160 | * regardless of event count. | |
7161 | */ | |
6c503150 | 7162 | return io_cqring_events(ctx) >= iowq->to_wait || |
bda52162 JA |
7163 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7164 | } | |
7165 | ||
7166 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7167 | int wake_flags, void *key) | |
7168 | { | |
7169 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7170 | wq); | |
7171 | ||
6c503150 PB |
7172 | /* |
7173 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7174 | * the task, and the next invocation will do it. | |
7175 | */ | |
7176 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow)) | |
7177 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7178 | return -1; | |
bda52162 JA |
7179 | } |
7180 | ||
af9c1a44 JA |
7181 | static int io_run_task_work_sig(void) |
7182 | { | |
7183 | if (io_run_task_work()) | |
7184 | return 1; | |
7185 | if (!signal_pending(current)) | |
7186 | return 0; | |
792ee0f6 JA |
7187 | if (test_tsk_thread_flag(current, TIF_NOTIFY_SIGNAL)) |
7188 | return -ERESTARTSYS; | |
af9c1a44 JA |
7189 | return -EINTR; |
7190 | } | |
7191 | ||
eeb60b9a PB |
7192 | /* when returns >0, the caller should retry */ |
7193 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7194 | struct io_wait_queue *iowq, | |
7195 | signed long *timeout) | |
7196 | { | |
7197 | int ret; | |
7198 | ||
7199 | /* make sure we run task_work before checking for signals */ | |
7200 | ret = io_run_task_work_sig(); | |
7201 | if (ret || io_should_wake(iowq)) | |
7202 | return ret; | |
7203 | /* let the caller flush overflows, retry */ | |
7204 | if (test_bit(0, &ctx->cq_check_overflow)) | |
7205 | return 1; | |
7206 | ||
7207 | *timeout = schedule_timeout(*timeout); | |
7208 | return !*timeout ? -ETIME : 1; | |
7209 | } | |
7210 | ||
2b188cc1 JA |
7211 | /* |
7212 | * Wait until events become available, if we don't already have some. The | |
7213 | * application must reap them itself, as they reside on the shared cq ring. | |
7214 | */ | |
7215 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7216 | const sigset_t __user *sig, size_t sigsz, |
7217 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7218 | { |
bda52162 JA |
7219 | struct io_wait_queue iowq = { |
7220 | .wq = { | |
7221 | .private = current, | |
7222 | .func = io_wake_function, | |
7223 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7224 | }, | |
7225 | .ctx = ctx, | |
7226 | .to_wait = min_events, | |
7227 | }; | |
75b28aff | 7228 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7229 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7230 | int ret; | |
2b188cc1 | 7231 | |
b41e9852 | 7232 | do { |
6c503150 PB |
7233 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
7234 | if (io_cqring_events(ctx) >= min_events) | |
b41e9852 | 7235 | return 0; |
4c6e277c | 7236 | if (!io_run_task_work()) |
b41e9852 | 7237 | break; |
b41e9852 | 7238 | } while (1); |
2b188cc1 JA |
7239 | |
7240 | if (sig) { | |
9e75ad5d AB |
7241 | #ifdef CONFIG_COMPAT |
7242 | if (in_compat_syscall()) | |
7243 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7244 | sigsz); |
9e75ad5d AB |
7245 | else |
7246 | #endif | |
b772434b | 7247 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7248 | |
2b188cc1 JA |
7249 | if (ret) |
7250 | return ret; | |
7251 | } | |
7252 | ||
c73ebb68 | 7253 | if (uts) { |
c1d5a224 PB |
7254 | struct timespec64 ts; |
7255 | ||
c73ebb68 HX |
7256 | if (get_timespec64(&ts, uts)) |
7257 | return -EFAULT; | |
7258 | timeout = timespec64_to_jiffies(&ts); | |
7259 | } | |
7260 | ||
bda52162 | 7261 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7262 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7263 | do { |
6c503150 | 7264 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
bda52162 JA |
7265 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, |
7266 | TASK_INTERRUPTIBLE); | |
eeb60b9a PB |
7267 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
7268 | finish_wait(&ctx->wait, &iowq.wq); | |
7269 | } while (ret > 0); | |
bda52162 | 7270 | |
b7db41c9 | 7271 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7272 | |
75b28aff | 7273 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7274 | } |
7275 | ||
6b06314c JA |
7276 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7277 | { | |
7278 | #if defined(CONFIG_UNIX) | |
7279 | if (ctx->ring_sock) { | |
7280 | struct sock *sock = ctx->ring_sock->sk; | |
7281 | struct sk_buff *skb; | |
7282 | ||
7283 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7284 | kfree_skb(skb); | |
7285 | } | |
7286 | #else | |
7287 | int i; | |
7288 | ||
65e19f54 JA |
7289 | for (i = 0; i < ctx->nr_user_files; i++) { |
7290 | struct file *file; | |
7291 | ||
7292 | file = io_file_from_index(ctx, i); | |
7293 | if (file) | |
7294 | fput(file); | |
7295 | } | |
6b06314c JA |
7296 | #endif |
7297 | } | |
7298 | ||
00835dce | 7299 | static void io_rsrc_data_ref_zero(struct percpu_ref *ref) |
05f3fb3c | 7300 | { |
269bbe5f | 7301 | struct fixed_rsrc_data *data; |
05f3fb3c | 7302 | |
269bbe5f | 7303 | data = container_of(ref, struct fixed_rsrc_data, refs); |
05f3fb3c JA |
7304 | complete(&data->done); |
7305 | } | |
7306 | ||
2a63b2d9 BM |
7307 | static inline void io_rsrc_ref_lock(struct io_ring_ctx *ctx) |
7308 | { | |
7309 | spin_lock_bh(&ctx->rsrc_ref_lock); | |
7310 | } | |
7311 | ||
7312 | static inline void io_rsrc_ref_unlock(struct io_ring_ctx *ctx) | |
7313 | { | |
7314 | spin_unlock_bh(&ctx->rsrc_ref_lock); | |
7315 | } | |
7316 | ||
d67d2263 BM |
7317 | static void io_sqe_rsrc_set_node(struct io_ring_ctx *ctx, |
7318 | struct fixed_rsrc_data *rsrc_data, | |
269bbe5f | 7319 | struct fixed_rsrc_ref_node *ref_node) |
1642b445 | 7320 | { |
2a63b2d9 | 7321 | io_rsrc_ref_lock(ctx); |
269bbe5f | 7322 | rsrc_data->node = ref_node; |
d67d2263 | 7323 | list_add_tail(&ref_node->node, &ctx->rsrc_ref_list); |
2a63b2d9 | 7324 | io_rsrc_ref_unlock(ctx); |
269bbe5f | 7325 | percpu_ref_get(&rsrc_data->refs); |
1642b445 PB |
7326 | } |
7327 | ||
d7954b2b BM |
7328 | static int io_rsrc_ref_quiesce(struct fixed_rsrc_data *data, |
7329 | struct io_ring_ctx *ctx, | |
7330 | struct fixed_rsrc_ref_node *backup_node) | |
6b06314c | 7331 | { |
d7954b2b | 7332 | struct fixed_rsrc_ref_node *ref_node; |
1ffc5422 | 7333 | int ret; |
65e19f54 | 7334 | |
2a63b2d9 | 7335 | io_rsrc_ref_lock(ctx); |
1e5d770b | 7336 | ref_node = data->node; |
2a63b2d9 | 7337 | io_rsrc_ref_unlock(ctx); |
05589553 XW |
7338 | if (ref_node) |
7339 | percpu_ref_kill(&ref_node->refs); | |
7340 | ||
7341 | percpu_ref_kill(&data->refs); | |
7342 | ||
7343 | /* wait for all refs nodes to complete */ | |
269bbe5f | 7344 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 PB |
7345 | do { |
7346 | ret = wait_for_completion_interruptible(&data->done); | |
7347 | if (!ret) | |
7348 | break; | |
7349 | ret = io_run_task_work_sig(); | |
7350 | if (ret < 0) { | |
7351 | percpu_ref_resurrect(&data->refs); | |
7352 | reinit_completion(&data->done); | |
d67d2263 | 7353 | io_sqe_rsrc_set_node(ctx, data, backup_node); |
1ffc5422 PB |
7354 | return ret; |
7355 | } | |
7356 | } while (1); | |
05f3fb3c | 7357 | |
d7954b2b BM |
7358 | destroy_fixed_rsrc_ref_node(backup_node); |
7359 | return 0; | |
7360 | } | |
7361 | ||
1ad555c6 BM |
7362 | static struct fixed_rsrc_data *alloc_fixed_rsrc_data(struct io_ring_ctx *ctx) |
7363 | { | |
7364 | struct fixed_rsrc_data *data; | |
7365 | ||
7366 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7367 | if (!data) | |
7368 | return NULL; | |
7369 | ||
00835dce | 7370 | if (percpu_ref_init(&data->refs, io_rsrc_data_ref_zero, |
1ad555c6 BM |
7371 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7372 | kfree(data); | |
7373 | return NULL; | |
7374 | } | |
7375 | data->ctx = ctx; | |
7376 | init_completion(&data->done); | |
7377 | return data; | |
7378 | } | |
7379 | ||
7380 | static void free_fixed_rsrc_data(struct fixed_rsrc_data *data) | |
7381 | { | |
7382 | percpu_ref_exit(&data->refs); | |
7383 | kfree(data->table); | |
7384 | kfree(data); | |
7385 | } | |
7386 | ||
d7954b2b BM |
7387 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7388 | { | |
7389 | struct fixed_rsrc_data *data = ctx->file_data; | |
7390 | struct fixed_rsrc_ref_node *backup_node; | |
7391 | unsigned nr_tables, i; | |
7392 | int ret; | |
7393 | ||
7394 | if (!data) | |
7395 | return -ENXIO; | |
7396 | backup_node = alloc_fixed_rsrc_ref_node(ctx); | |
7397 | if (!backup_node) | |
7398 | return -ENOMEM; | |
7399 | init_fixed_file_ref_node(ctx, backup_node); | |
7400 | ||
7401 | ret = io_rsrc_ref_quiesce(data, ctx, backup_node); | |
7402 | if (ret) | |
7403 | return ret; | |
7404 | ||
6b06314c | 7405 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7406 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7407 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7408 | kfree(data->table[i].files); |
1ad555c6 | 7409 | free_fixed_rsrc_data(data); |
05f3fb3c | 7410 | ctx->file_data = NULL; |
6b06314c JA |
7411 | ctx->nr_user_files = 0; |
7412 | return 0; | |
7413 | } | |
7414 | ||
534ca6d6 | 7415 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7416 | { |
534ca6d6 | 7417 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7418 | /* |
7419 | * The park is a bit of a work-around, without it we get | |
7420 | * warning spews on shutdown with SQPOLL set and affinity | |
7421 | * set to a single CPU. | |
7422 | */ | |
534ca6d6 JA |
7423 | if (sqd->thread) { |
7424 | kthread_park(sqd->thread); | |
7425 | kthread_stop(sqd->thread); | |
7426 | } | |
7427 | ||
7428 | kfree(sqd); | |
7429 | } | |
7430 | } | |
7431 | ||
aa06165d JA |
7432 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7433 | { | |
7434 | struct io_ring_ctx *ctx_attach; | |
7435 | struct io_sq_data *sqd; | |
7436 | struct fd f; | |
7437 | ||
7438 | f = fdget(p->wq_fd); | |
7439 | if (!f.file) | |
7440 | return ERR_PTR(-ENXIO); | |
7441 | if (f.file->f_op != &io_uring_fops) { | |
7442 | fdput(f); | |
7443 | return ERR_PTR(-EINVAL); | |
7444 | } | |
7445 | ||
7446 | ctx_attach = f.file->private_data; | |
7447 | sqd = ctx_attach->sq_data; | |
7448 | if (!sqd) { | |
7449 | fdput(f); | |
7450 | return ERR_PTR(-EINVAL); | |
7451 | } | |
7452 | ||
7453 | refcount_inc(&sqd->refs); | |
7454 | fdput(f); | |
7455 | return sqd; | |
7456 | } | |
7457 | ||
534ca6d6 JA |
7458 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7459 | { | |
7460 | struct io_sq_data *sqd; | |
7461 | ||
aa06165d JA |
7462 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7463 | return io_attach_sq_data(p); | |
7464 | ||
534ca6d6 JA |
7465 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7466 | if (!sqd) | |
7467 | return ERR_PTR(-ENOMEM); | |
7468 | ||
7469 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7470 | INIT_LIST_HEAD(&sqd->ctx_list); |
7471 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7472 | mutex_init(&sqd->ctx_lock); | |
7473 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7474 | init_waitqueue_head(&sqd->wait); |
7475 | return sqd; | |
7476 | } | |
7477 | ||
69fb2131 JA |
7478 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7479 | __releases(&sqd->lock) | |
7480 | { | |
7481 | if (!sqd->thread) | |
7482 | return; | |
7483 | kthread_unpark(sqd->thread); | |
7484 | mutex_unlock(&sqd->lock); | |
7485 | } | |
7486 | ||
7487 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7488 | __acquires(&sqd->lock) | |
7489 | { | |
7490 | if (!sqd->thread) | |
7491 | return; | |
7492 | mutex_lock(&sqd->lock); | |
7493 | kthread_park(sqd->thread); | |
7494 | } | |
7495 | ||
534ca6d6 JA |
7496 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7497 | { | |
7498 | struct io_sq_data *sqd = ctx->sq_data; | |
7499 | ||
7500 | if (sqd) { | |
7501 | if (sqd->thread) { | |
7502 | /* | |
7503 | * We may arrive here from the error branch in | |
7504 | * io_sq_offload_create() where the kthread is created | |
7505 | * without being waked up, thus wake it up now to make | |
7506 | * sure the wait will complete. | |
7507 | */ | |
7508 | wake_up_process(sqd->thread); | |
7509 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7510 | |
7511 | io_sq_thread_park(sqd); | |
7512 | } | |
7513 | ||
7514 | mutex_lock(&sqd->ctx_lock); | |
7515 | list_del(&ctx->sqd_list); | |
08369246 | 7516 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7517 | mutex_unlock(&sqd->ctx_lock); |
7518 | ||
08369246 | 7519 | if (sqd->thread) |
69fb2131 | 7520 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7521 | |
7522 | io_put_sq_data(sqd); | |
7523 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7524 | } |
7525 | } | |
7526 | ||
6b06314c JA |
7527 | static void io_finish_async(struct io_ring_ctx *ctx) |
7528 | { | |
6c271ce2 JA |
7529 | io_sq_thread_stop(ctx); |
7530 | ||
561fb04a JA |
7531 | if (ctx->io_wq) { |
7532 | io_wq_destroy(ctx->io_wq); | |
7533 | ctx->io_wq = NULL; | |
6b06314c JA |
7534 | } |
7535 | } | |
7536 | ||
7537 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7538 | /* |
7539 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7540 | * the io_uring can be safely unregistered on process exit, even if we have | |
7541 | * loops in the file referencing. | |
7542 | */ | |
7543 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7544 | { | |
7545 | struct sock *sk = ctx->ring_sock->sk; | |
7546 | struct scm_fp_list *fpl; | |
7547 | struct sk_buff *skb; | |
08a45173 | 7548 | int i, nr_files; |
6b06314c | 7549 | |
6b06314c JA |
7550 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7551 | if (!fpl) | |
7552 | return -ENOMEM; | |
7553 | ||
7554 | skb = alloc_skb(0, GFP_KERNEL); | |
7555 | if (!skb) { | |
7556 | kfree(fpl); | |
7557 | return -ENOMEM; | |
7558 | } | |
7559 | ||
7560 | skb->sk = sk; | |
6b06314c | 7561 | |
08a45173 | 7562 | nr_files = 0; |
6b06314c JA |
7563 | fpl->user = get_uid(ctx->user); |
7564 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7565 | struct file *file = io_file_from_index(ctx, i + offset); |
7566 | ||
7567 | if (!file) | |
08a45173 | 7568 | continue; |
65e19f54 | 7569 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7570 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7571 | nr_files++; | |
6b06314c JA |
7572 | } |
7573 | ||
08a45173 JA |
7574 | if (nr_files) { |
7575 | fpl->max = SCM_MAX_FD; | |
7576 | fpl->count = nr_files; | |
7577 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7578 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7579 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7580 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7581 | |
08a45173 JA |
7582 | for (i = 0; i < nr_files; i++) |
7583 | fput(fpl->fp[i]); | |
7584 | } else { | |
7585 | kfree_skb(skb); | |
7586 | kfree(fpl); | |
7587 | } | |
6b06314c JA |
7588 | |
7589 | return 0; | |
7590 | } | |
7591 | ||
7592 | /* | |
7593 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7594 | * causes regular reference counting to break down. We rely on the UNIX | |
7595 | * garbage collection to take care of this problem for us. | |
7596 | */ | |
7597 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7598 | { | |
7599 | unsigned left, total; | |
7600 | int ret = 0; | |
7601 | ||
7602 | total = 0; | |
7603 | left = ctx->nr_user_files; | |
7604 | while (left) { | |
7605 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7606 | |
7607 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7608 | if (ret) | |
7609 | break; | |
7610 | left -= this_files; | |
7611 | total += this_files; | |
7612 | } | |
7613 | ||
7614 | if (!ret) | |
7615 | return 0; | |
7616 | ||
7617 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7618 | struct file *file = io_file_from_index(ctx, total); |
7619 | ||
7620 | if (file) | |
7621 | fput(file); | |
6b06314c JA |
7622 | total++; |
7623 | } | |
7624 | ||
7625 | return ret; | |
7626 | } | |
7627 | #else | |
7628 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7629 | { | |
7630 | return 0; | |
7631 | } | |
7632 | #endif | |
7633 | ||
269bbe5f | 7634 | static int io_sqe_alloc_file_tables(struct fixed_rsrc_data *file_data, |
5398ae69 | 7635 | unsigned nr_tables, unsigned nr_files) |
65e19f54 JA |
7636 | { |
7637 | int i; | |
7638 | ||
7639 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7640 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7641 | unsigned this_files; |
7642 | ||
7643 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7644 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7645 | GFP_KERNEL); | |
7646 | if (!table->files) | |
7647 | break; | |
7648 | nr_files -= this_files; | |
7649 | } | |
7650 | ||
7651 | if (i == nr_tables) | |
7652 | return 0; | |
7653 | ||
7654 | for (i = 0; i < nr_tables; i++) { | |
269bbe5f | 7655 | struct fixed_rsrc_table *table = &file_data->table[i]; |
65e19f54 JA |
7656 | kfree(table->files); |
7657 | } | |
7658 | return 1; | |
7659 | } | |
7660 | ||
50238531 | 7661 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7662 | { |
50238531 | 7663 | struct file *file = prsrc->file; |
05f3fb3c JA |
7664 | #if defined(CONFIG_UNIX) |
7665 | struct sock *sock = ctx->ring_sock->sk; | |
7666 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7667 | struct sk_buff *skb; | |
7668 | int i; | |
7669 | ||
7670 | __skb_queue_head_init(&list); | |
7671 | ||
7672 | /* | |
7673 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7674 | * remove this entry and rearrange the file array. | |
7675 | */ | |
7676 | skb = skb_dequeue(head); | |
7677 | while (skb) { | |
7678 | struct scm_fp_list *fp; | |
7679 | ||
7680 | fp = UNIXCB(skb).fp; | |
7681 | for (i = 0; i < fp->count; i++) { | |
7682 | int left; | |
7683 | ||
7684 | if (fp->fp[i] != file) | |
7685 | continue; | |
7686 | ||
7687 | unix_notinflight(fp->user, fp->fp[i]); | |
7688 | left = fp->count - 1 - i; | |
7689 | if (left) { | |
7690 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7691 | left * sizeof(struct file *)); | |
7692 | } | |
7693 | fp->count--; | |
7694 | if (!fp->count) { | |
7695 | kfree_skb(skb); | |
7696 | skb = NULL; | |
7697 | } else { | |
7698 | __skb_queue_tail(&list, skb); | |
7699 | } | |
7700 | fput(file); | |
7701 | file = NULL; | |
7702 | break; | |
7703 | } | |
7704 | ||
7705 | if (!file) | |
7706 | break; | |
7707 | ||
7708 | __skb_queue_tail(&list, skb); | |
7709 | ||
7710 | skb = skb_dequeue(head); | |
7711 | } | |
7712 | ||
7713 | if (skb_peek(&list)) { | |
7714 | spin_lock_irq(&head->lock); | |
7715 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7716 | __skb_queue_tail(head, skb); | |
7717 | spin_unlock_irq(&head->lock); | |
7718 | } | |
7719 | #else | |
7720 | fput(file); | |
7721 | #endif | |
7722 | } | |
7723 | ||
269bbe5f | 7724 | static void __io_rsrc_put_work(struct fixed_rsrc_ref_node *ref_node) |
65e19f54 | 7725 | { |
269bbe5f BM |
7726 | struct fixed_rsrc_data *rsrc_data = ref_node->rsrc_data; |
7727 | struct io_ring_ctx *ctx = rsrc_data->ctx; | |
7728 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7729 | |
269bbe5f BM |
7730 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7731 | list_del(&prsrc->list); | |
50238531 | 7732 | ref_node->rsrc_put(ctx, prsrc); |
269bbe5f | 7733 | kfree(prsrc); |
65e19f54 | 7734 | } |
05589553 | 7735 | |
05589553 XW |
7736 | percpu_ref_exit(&ref_node->refs); |
7737 | kfree(ref_node); | |
269bbe5f | 7738 | percpu_ref_put(&rsrc_data->refs); |
2faf852d | 7739 | } |
65e19f54 | 7740 | |
269bbe5f | 7741 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7742 | { |
7743 | struct io_ring_ctx *ctx; | |
7744 | struct llist_node *node; | |
7745 | ||
269bbe5f BM |
7746 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7747 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7748 | |
7749 | while (node) { | |
269bbe5f | 7750 | struct fixed_rsrc_ref_node *ref_node; |
4a38aed2 JA |
7751 | struct llist_node *next = node->next; |
7752 | ||
269bbe5f BM |
7753 | ref_node = llist_entry(node, struct fixed_rsrc_ref_node, llist); |
7754 | __io_rsrc_put_work(ref_node); | |
4a38aed2 JA |
7755 | node = next; |
7756 | } | |
7757 | } | |
7758 | ||
ea64ec02 PB |
7759 | static struct file **io_fixed_file_slot(struct fixed_rsrc_data *file_data, |
7760 | unsigned i) | |
7761 | { | |
7762 | struct fixed_rsrc_table *table; | |
7763 | ||
7764 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7765 | return &table->files[i & IORING_FILE_TABLE_MASK]; | |
7766 | } | |
7767 | ||
00835dce | 7768 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
2faf852d | 7769 | { |
269bbe5f BM |
7770 | struct fixed_rsrc_ref_node *ref_node; |
7771 | struct fixed_rsrc_data *data; | |
4a38aed2 | 7772 | struct io_ring_ctx *ctx; |
e297822b | 7773 | bool first_add = false; |
4a38aed2 | 7774 | int delay = HZ; |
65e19f54 | 7775 | |
269bbe5f BM |
7776 | ref_node = container_of(ref, struct fixed_rsrc_ref_node, refs); |
7777 | data = ref_node->rsrc_data; | |
e297822b PB |
7778 | ctx = data->ctx; |
7779 | ||
2a63b2d9 | 7780 | io_rsrc_ref_lock(ctx); |
e297822b PB |
7781 | ref_node->done = true; |
7782 | ||
d67d2263 BM |
7783 | while (!list_empty(&ctx->rsrc_ref_list)) { |
7784 | ref_node = list_first_entry(&ctx->rsrc_ref_list, | |
269bbe5f | 7785 | struct fixed_rsrc_ref_node, node); |
e297822b PB |
7786 | /* recycle ref nodes in order */ |
7787 | if (!ref_node->done) | |
7788 | break; | |
7789 | list_del(&ref_node->node); | |
269bbe5f | 7790 | first_add |= llist_add(&ref_node->llist, &ctx->rsrc_put_llist); |
e297822b | 7791 | } |
2a63b2d9 | 7792 | io_rsrc_ref_unlock(ctx); |
05589553 | 7793 | |
e297822b | 7794 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7795 | delay = 0; |
05589553 | 7796 | |
4a38aed2 | 7797 | if (!delay) |
269bbe5f | 7798 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, 0); |
4a38aed2 | 7799 | else if (first_add) |
269bbe5f | 7800 | queue_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
05f3fb3c | 7801 | } |
65e19f54 | 7802 | |
6802535d | 7803 | static struct fixed_rsrc_ref_node *alloc_fixed_rsrc_ref_node( |
05589553 | 7804 | struct io_ring_ctx *ctx) |
05f3fb3c | 7805 | { |
269bbe5f | 7806 | struct fixed_rsrc_ref_node *ref_node; |
05f3fb3c | 7807 | |
05589553 XW |
7808 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7809 | if (!ref_node) | |
3e2224c5 | 7810 | return NULL; |
05f3fb3c | 7811 | |
00835dce | 7812 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, |
05589553 XW |
7813 | 0, GFP_KERNEL)) { |
7814 | kfree(ref_node); | |
3e2224c5 | 7815 | return NULL; |
05589553 XW |
7816 | } |
7817 | INIT_LIST_HEAD(&ref_node->node); | |
269bbe5f | 7818 | INIT_LIST_HEAD(&ref_node->rsrc_list); |
6802535d BM |
7819 | ref_node->done = false; |
7820 | return ref_node; | |
7821 | } | |
7822 | ||
bc9744cd PB |
7823 | static void init_fixed_file_ref_node(struct io_ring_ctx *ctx, |
7824 | struct fixed_rsrc_ref_node *ref_node) | |
6802535d | 7825 | { |
269bbe5f | 7826 | ref_node->rsrc_data = ctx->file_data; |
50238531 | 7827 | ref_node->rsrc_put = io_ring_file_put; |
05589553 XW |
7828 | } |
7829 | ||
269bbe5f | 7830 | static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node) |
05589553 XW |
7831 | { |
7832 | percpu_ref_exit(&ref_node->refs); | |
7833 | kfree(ref_node); | |
65e19f54 JA |
7834 | } |
7835 | ||
ea64ec02 | 7836 | |
6b06314c JA |
7837 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7838 | unsigned nr_args) | |
7839 | { | |
7840 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7841 | unsigned nr_tables, i; |
05f3fb3c | 7842 | struct file *file; |
600cf3f8 | 7843 | int fd, ret = -ENOMEM; |
269bbe5f BM |
7844 | struct fixed_rsrc_ref_node *ref_node; |
7845 | struct fixed_rsrc_data *file_data; | |
6b06314c | 7846 | |
05f3fb3c | 7847 | if (ctx->file_data) |
6b06314c JA |
7848 | return -EBUSY; |
7849 | if (!nr_args) | |
7850 | return -EINVAL; | |
7851 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7852 | return -EMFILE; | |
7853 | ||
1ad555c6 | 7854 | file_data = alloc_fixed_rsrc_data(ctx); |
5398ae69 | 7855 | if (!file_data) |
05f3fb3c | 7856 | return -ENOMEM; |
13770a71 | 7857 | ctx->file_data = file_data; |
05f3fb3c | 7858 | |
65e19f54 | 7859 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7860 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7861 | GFP_KERNEL); |
600cf3f8 PB |
7862 | if (!file_data->table) |
7863 | goto out_free; | |
05f3fb3c | 7864 | |
600cf3f8 | 7865 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
1ad555c6 | 7866 | goto out_free; |
65e19f54 | 7867 | |
08a45173 | 7868 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
600cf3f8 PB |
7869 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7870 | ret = -EFAULT; | |
7871 | goto out_fput; | |
7872 | } | |
08a45173 | 7873 | /* allow sparse sets */ |
600cf3f8 | 7874 | if (fd == -1) |
08a45173 | 7875 | continue; |
6b06314c | 7876 | |
05f3fb3c | 7877 | file = fget(fd); |
6b06314c | 7878 | ret = -EBADF; |
05f3fb3c | 7879 | if (!file) |
600cf3f8 | 7880 | goto out_fput; |
05f3fb3c | 7881 | |
6b06314c JA |
7882 | /* |
7883 | * Don't allow io_uring instances to be registered. If UNIX | |
7884 | * isn't enabled, then this causes a reference cycle and this | |
7885 | * instance can never get freed. If UNIX is enabled we'll | |
7886 | * handle it just fine, but there's still no point in allowing | |
7887 | * a ring fd as it doesn't support regular read/write anyway. | |
7888 | */ | |
05f3fb3c JA |
7889 | if (file->f_op == &io_uring_fops) { |
7890 | fput(file); | |
600cf3f8 | 7891 | goto out_fput; |
6b06314c | 7892 | } |
ea64ec02 | 7893 | *io_fixed_file_slot(file_data, i) = file; |
6b06314c JA |
7894 | } |
7895 | ||
6b06314c | 7896 | ret = io_sqe_files_scm(ctx); |
05589553 | 7897 | if (ret) { |
6b06314c | 7898 | io_sqe_files_unregister(ctx); |
05589553 XW |
7899 | return ret; |
7900 | } | |
6b06314c | 7901 | |
bc9744cd | 7902 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 | 7903 | if (!ref_node) { |
05589553 | 7904 | io_sqe_files_unregister(ctx); |
3e2224c5 | 7905 | return -ENOMEM; |
05589553 | 7906 | } |
bc9744cd | 7907 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 7908 | |
d67d2263 | 7909 | io_sqe_rsrc_set_node(ctx, file_data, ref_node); |
6b06314c | 7910 | return ret; |
600cf3f8 PB |
7911 | out_fput: |
7912 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7913 | file = io_file_from_index(ctx, i); | |
7914 | if (file) | |
7915 | fput(file); | |
7916 | } | |
7917 | for (i = 0; i < nr_tables; i++) | |
7918 | kfree(file_data->table[i].files); | |
7919 | ctx->nr_user_files = 0; | |
600cf3f8 | 7920 | out_free: |
1ad555c6 | 7921 | free_fixed_rsrc_data(ctx->file_data); |
55cbc256 | 7922 | ctx->file_data = NULL; |
6b06314c JA |
7923 | return ret; |
7924 | } | |
7925 | ||
c3a31e60 JA |
7926 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7927 | int index) | |
7928 | { | |
7929 | #if defined(CONFIG_UNIX) | |
7930 | struct sock *sock = ctx->ring_sock->sk; | |
7931 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7932 | struct sk_buff *skb; | |
7933 | ||
7934 | /* | |
7935 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7936 | * file set. If there's no room, fall back to allocating a new skb | |
7937 | * and filling it in. | |
7938 | */ | |
7939 | spin_lock_irq(&head->lock); | |
7940 | skb = skb_peek(head); | |
7941 | if (skb) { | |
7942 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7943 | ||
7944 | if (fpl->count < SCM_MAX_FD) { | |
7945 | __skb_unlink(skb, head); | |
7946 | spin_unlock_irq(&head->lock); | |
7947 | fpl->fp[fpl->count] = get_file(file); | |
7948 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7949 | fpl->count++; | |
7950 | spin_lock_irq(&head->lock); | |
7951 | __skb_queue_head(head, skb); | |
7952 | } else { | |
7953 | skb = NULL; | |
7954 | } | |
7955 | } | |
7956 | spin_unlock_irq(&head->lock); | |
7957 | ||
7958 | if (skb) { | |
7959 | fput(file); | |
7960 | return 0; | |
7961 | } | |
7962 | ||
7963 | return __io_sqe_files_scm(ctx, 1, index); | |
7964 | #else | |
7965 | return 0; | |
7966 | #endif | |
7967 | } | |
7968 | ||
50238531 | 7969 | static int io_queue_rsrc_removal(struct fixed_rsrc_data *data, void *rsrc) |
05f3fb3c | 7970 | { |
269bbe5f BM |
7971 | struct io_rsrc_put *prsrc; |
7972 | struct fixed_rsrc_ref_node *ref_node = data->node; | |
05f3fb3c | 7973 | |
269bbe5f BM |
7974 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
7975 | if (!prsrc) | |
a5318d3c | 7976 | return -ENOMEM; |
05f3fb3c | 7977 | |
50238531 | 7978 | prsrc->rsrc = rsrc; |
269bbe5f | 7979 | list_add(&prsrc->list, &ref_node->rsrc_list); |
05589553 | 7980 | |
a5318d3c | 7981 | return 0; |
05f3fb3c JA |
7982 | } |
7983 | ||
269bbe5f BM |
7984 | static inline int io_queue_file_removal(struct fixed_rsrc_data *data, |
7985 | struct file *file) | |
7986 | { | |
50238531 | 7987 | return io_queue_rsrc_removal(data, (void *)file); |
269bbe5f BM |
7988 | } |
7989 | ||
05f3fb3c | 7990 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
269bbe5f | 7991 | struct io_uring_rsrc_update *up, |
05f3fb3c JA |
7992 | unsigned nr_args) |
7993 | { | |
269bbe5f BM |
7994 | struct fixed_rsrc_data *data = ctx->file_data; |
7995 | struct fixed_rsrc_ref_node *ref_node; | |
ea64ec02 | 7996 | struct file *file, **file_slot; |
c3a31e60 JA |
7997 | __s32 __user *fds; |
7998 | int fd, i, err; | |
7999 | __u32 done; | |
05589553 | 8000 | bool needs_switch = false; |
c3a31e60 | 8001 | |
05f3fb3c | 8002 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
8003 | return -EOVERFLOW; |
8004 | if (done > ctx->nr_user_files) | |
8005 | return -EINVAL; | |
8006 | ||
bc9744cd | 8007 | ref_node = alloc_fixed_rsrc_ref_node(ctx); |
3e2224c5 MWO |
8008 | if (!ref_node) |
8009 | return -ENOMEM; | |
bc9744cd | 8010 | init_fixed_file_ref_node(ctx, ref_node); |
05589553 | 8011 | |
269bbe5f | 8012 | fds = u64_to_user_ptr(up->data); |
67973b93 | 8013 | for (done = 0; done < nr_args; done++) { |
c3a31e60 JA |
8014 | err = 0; |
8015 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
8016 | err = -EFAULT; | |
8017 | break; | |
8018 | } | |
4e0377a1 | 8019 | if (fd == IORING_REGISTER_FILES_SKIP) |
8020 | continue; | |
8021 | ||
67973b93 | 8022 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
ea64ec02 PB |
8023 | file_slot = io_fixed_file_slot(ctx->file_data, i); |
8024 | ||
8025 | if (*file_slot) { | |
8026 | err = io_queue_file_removal(data, *file_slot); | |
a5318d3c HD |
8027 | if (err) |
8028 | break; | |
ea64ec02 | 8029 | *file_slot = NULL; |
05589553 | 8030 | needs_switch = true; |
c3a31e60 JA |
8031 | } |
8032 | if (fd != -1) { | |
c3a31e60 JA |
8033 | file = fget(fd); |
8034 | if (!file) { | |
8035 | err = -EBADF; | |
8036 | break; | |
8037 | } | |
8038 | /* | |
8039 | * Don't allow io_uring instances to be registered. If | |
8040 | * UNIX isn't enabled, then this causes a reference | |
8041 | * cycle and this instance can never get freed. If UNIX | |
8042 | * is enabled we'll handle it just fine, but there's | |
8043 | * still no point in allowing a ring fd as it doesn't | |
8044 | * support regular read/write anyway. | |
8045 | */ | |
8046 | if (file->f_op == &io_uring_fops) { | |
8047 | fput(file); | |
8048 | err = -EBADF; | |
8049 | break; | |
8050 | } | |
e68a3ff8 | 8051 | *file_slot = file; |
c3a31e60 | 8052 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8053 | if (err) { |
e68a3ff8 | 8054 | *file_slot = NULL; |
f3bd9dae | 8055 | fput(file); |
c3a31e60 | 8056 | break; |
f3bd9dae | 8057 | } |
c3a31e60 | 8058 | } |
05f3fb3c JA |
8059 | } |
8060 | ||
05589553 | 8061 | if (needs_switch) { |
b2e96852 | 8062 | percpu_ref_kill(&data->node->refs); |
d67d2263 | 8063 | io_sqe_rsrc_set_node(ctx, data, ref_node); |
05589553 | 8064 | } else |
269bbe5f | 8065 | destroy_fixed_rsrc_ref_node(ref_node); |
c3a31e60 JA |
8066 | |
8067 | return done ? done : err; | |
8068 | } | |
05589553 | 8069 | |
05f3fb3c JA |
8070 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
8071 | unsigned nr_args) | |
8072 | { | |
269bbe5f | 8073 | struct io_uring_rsrc_update up; |
05f3fb3c JA |
8074 | |
8075 | if (!ctx->file_data) | |
8076 | return -ENXIO; | |
8077 | if (!nr_args) | |
8078 | return -EINVAL; | |
8079 | if (copy_from_user(&up, arg, sizeof(up))) | |
8080 | return -EFAULT; | |
8081 | if (up.resv) | |
8082 | return -EINVAL; | |
8083 | ||
8084 | return __io_sqe_files_update(ctx, &up, nr_args); | |
8085 | } | |
c3a31e60 | 8086 | |
5280f7e5 | 8087 | static struct io_wq_work *io_free_work(struct io_wq_work *work) |
7d723065 JA |
8088 | { |
8089 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8090 | ||
5280f7e5 PB |
8091 | req = io_put_req_find_next(req); |
8092 | return req ? &req->work : NULL; | |
7d723065 JA |
8093 | } |
8094 | ||
24369c2e PB |
8095 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
8096 | struct io_uring_params *p) | |
8097 | { | |
8098 | struct io_wq_data data; | |
8099 | struct fd f; | |
8100 | struct io_ring_ctx *ctx_attach; | |
8101 | unsigned int concurrency; | |
8102 | int ret = 0; | |
8103 | ||
8104 | data.user = ctx->user; | |
e9fd9396 | 8105 | data.free_work = io_free_work; |
f5fa38c5 | 8106 | data.do_work = io_wq_submit_work; |
24369c2e PB |
8107 | |
8108 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
8109 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
8110 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
8111 | ||
8112 | ctx->io_wq = io_wq_create(concurrency, &data); | |
8113 | if (IS_ERR(ctx->io_wq)) { | |
8114 | ret = PTR_ERR(ctx->io_wq); | |
8115 | ctx->io_wq = NULL; | |
8116 | } | |
8117 | return ret; | |
8118 | } | |
8119 | ||
8120 | f = fdget(p->wq_fd); | |
8121 | if (!f.file) | |
8122 | return -EBADF; | |
8123 | ||
8124 | if (f.file->f_op != &io_uring_fops) { | |
8125 | ret = -EINVAL; | |
8126 | goto out_fput; | |
8127 | } | |
8128 | ||
8129 | ctx_attach = f.file->private_data; | |
8130 | /* @io_wq is protected by holding the fd */ | |
8131 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
8132 | ret = -EINVAL; | |
8133 | goto out_fput; | |
8134 | } | |
8135 | ||
8136 | ctx->io_wq = ctx_attach->io_wq; | |
8137 | out_fput: | |
8138 | fdput(f); | |
8139 | return ret; | |
8140 | } | |
8141 | ||
0f212204 JA |
8142 | static int io_uring_alloc_task_context(struct task_struct *task) |
8143 | { | |
8144 | struct io_uring_task *tctx; | |
d8a6df10 | 8145 | int ret; |
0f212204 JA |
8146 | |
8147 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
8148 | if (unlikely(!tctx)) | |
8149 | return -ENOMEM; | |
8150 | ||
d8a6df10 JA |
8151 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8152 | if (unlikely(ret)) { | |
8153 | kfree(tctx); | |
8154 | return ret; | |
8155 | } | |
8156 | ||
0f212204 JA |
8157 | xa_init(&tctx->xa); |
8158 | init_waitqueue_head(&tctx->wait); | |
8159 | tctx->last = NULL; | |
fdaf083c JA |
8160 | atomic_set(&tctx->in_idle, 0); |
8161 | tctx->sqpoll = false; | |
500a373d JA |
8162 | io_init_identity(&tctx->__identity); |
8163 | tctx->identity = &tctx->__identity; | |
0f212204 | 8164 | task->io_uring = tctx; |
7cbf1722 JA |
8165 | spin_lock_init(&tctx->task_lock); |
8166 | INIT_WQ_LIST(&tctx->task_list); | |
8167 | tctx->task_state = 0; | |
8168 | init_task_work(&tctx->task_work, tctx_task_work); | |
0f212204 JA |
8169 | return 0; |
8170 | } | |
8171 | ||
8172 | void __io_uring_free(struct task_struct *tsk) | |
8173 | { | |
8174 | struct io_uring_task *tctx = tsk->io_uring; | |
8175 | ||
8176 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8177 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8178 | if (tctx->identity != &tctx->__identity) | |
8179 | kfree(tctx->identity); | |
d8a6df10 | 8180 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8181 | kfree(tctx); |
8182 | tsk->io_uring = NULL; | |
8183 | } | |
8184 | ||
7e84e1c7 SG |
8185 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8186 | struct io_uring_params *p) | |
2b188cc1 JA |
8187 | { |
8188 | int ret; | |
8189 | ||
6c271ce2 | 8190 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8191 | struct io_sq_data *sqd; |
8192 | ||
3ec482d1 | 8193 | ret = -EPERM; |
ce59fc69 | 8194 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8195 | goto err; |
8196 | ||
534ca6d6 JA |
8197 | sqd = io_get_sq_data(p); |
8198 | if (IS_ERR(sqd)) { | |
8199 | ret = PTR_ERR(sqd); | |
8200 | goto err; | |
8201 | } | |
69fb2131 | 8202 | |
534ca6d6 | 8203 | ctx->sq_data = sqd; |
69fb2131 JA |
8204 | io_sq_thread_park(sqd); |
8205 | mutex_lock(&sqd->ctx_lock); | |
8206 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8207 | mutex_unlock(&sqd->ctx_lock); | |
8208 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8209 | |
917257da JA |
8210 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8211 | if (!ctx->sq_thread_idle) | |
8212 | ctx->sq_thread_idle = HZ; | |
8213 | ||
aa06165d JA |
8214 | if (sqd->thread) |
8215 | goto done; | |
8216 | ||
6c271ce2 | 8217 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8218 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8219 | |
917257da | 8220 | ret = -EINVAL; |
44a9bd18 JA |
8221 | if (cpu >= nr_cpu_ids) |
8222 | goto err; | |
7889f44d | 8223 | if (!cpu_online(cpu)) |
917257da JA |
8224 | goto err; |
8225 | ||
69fb2131 | 8226 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8227 | cpu, "io_uring-sq"); |
6c271ce2 | 8228 | } else { |
69fb2131 | 8229 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8230 | "io_uring-sq"); |
8231 | } | |
534ca6d6 JA |
8232 | if (IS_ERR(sqd->thread)) { |
8233 | ret = PTR_ERR(sqd->thread); | |
8234 | sqd->thread = NULL; | |
6c271ce2 JA |
8235 | goto err; |
8236 | } | |
534ca6d6 | 8237 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8238 | if (ret) |
8239 | goto err; | |
6c271ce2 JA |
8240 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8241 | /* Can't have SQ_AFF without SQPOLL */ | |
8242 | ret = -EINVAL; | |
8243 | goto err; | |
8244 | } | |
8245 | ||
aa06165d | 8246 | done: |
24369c2e PB |
8247 | ret = io_init_wq_offload(ctx, p); |
8248 | if (ret) | |
2b188cc1 | 8249 | goto err; |
2b188cc1 JA |
8250 | |
8251 | return 0; | |
8252 | err: | |
54a91f3b | 8253 | io_finish_async(ctx); |
2b188cc1 JA |
8254 | return ret; |
8255 | } | |
8256 | ||
7e84e1c7 SG |
8257 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8258 | { | |
534ca6d6 JA |
8259 | struct io_sq_data *sqd = ctx->sq_data; |
8260 | ||
8261 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8262 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8263 | } |
8264 | ||
a087e2b5 BM |
8265 | static inline void __io_unaccount_mem(struct user_struct *user, |
8266 | unsigned long nr_pages) | |
2b188cc1 JA |
8267 | { |
8268 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8269 | } | |
8270 | ||
a087e2b5 BM |
8271 | static inline int __io_account_mem(struct user_struct *user, |
8272 | unsigned long nr_pages) | |
2b188cc1 JA |
8273 | { |
8274 | unsigned long page_limit, cur_pages, new_pages; | |
8275 | ||
8276 | /* Don't allow more pages than we can safely lock */ | |
8277 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8278 | ||
8279 | do { | |
8280 | cur_pages = atomic_long_read(&user->locked_vm); | |
8281 | new_pages = cur_pages + nr_pages; | |
8282 | if (new_pages > page_limit) | |
8283 | return -ENOMEM; | |
8284 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8285 | new_pages) != cur_pages); | |
8286 | ||
8287 | return 0; | |
8288 | } | |
8289 | ||
26bfa89e | 8290 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8291 | { |
aad5d8da | 8292 | if (ctx->limit_mem) |
a087e2b5 | 8293 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8294 | |
26bfa89e JA |
8295 | if (ctx->mm_account) |
8296 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8297 | } |
8298 | ||
26bfa89e | 8299 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8300 | { |
30975825 BM |
8301 | int ret; |
8302 | ||
8303 | if (ctx->limit_mem) { | |
8304 | ret = __io_account_mem(ctx->user, nr_pages); | |
8305 | if (ret) | |
8306 | return ret; | |
8307 | } | |
8308 | ||
26bfa89e JA |
8309 | if (ctx->mm_account) |
8310 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8311 | |
8312 | return 0; | |
8313 | } | |
8314 | ||
2b188cc1 JA |
8315 | static void io_mem_free(void *ptr) |
8316 | { | |
52e04ef4 MR |
8317 | struct page *page; |
8318 | ||
8319 | if (!ptr) | |
8320 | return; | |
2b188cc1 | 8321 | |
52e04ef4 | 8322 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8323 | if (put_page_testzero(page)) |
8324 | free_compound_page(page); | |
8325 | } | |
8326 | ||
8327 | static void *io_mem_alloc(size_t size) | |
8328 | { | |
8329 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8330 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8331 | |
8332 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8333 | } | |
8334 | ||
75b28aff HV |
8335 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8336 | size_t *sq_offset) | |
8337 | { | |
8338 | struct io_rings *rings; | |
8339 | size_t off, sq_array_size; | |
8340 | ||
8341 | off = struct_size(rings, cqes, cq_entries); | |
8342 | if (off == SIZE_MAX) | |
8343 | return SIZE_MAX; | |
8344 | ||
8345 | #ifdef CONFIG_SMP | |
8346 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8347 | if (off == 0) | |
8348 | return SIZE_MAX; | |
8349 | #endif | |
8350 | ||
b36200f5 DV |
8351 | if (sq_offset) |
8352 | *sq_offset = off; | |
8353 | ||
75b28aff HV |
8354 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8355 | if (sq_array_size == SIZE_MAX) | |
8356 | return SIZE_MAX; | |
8357 | ||
8358 | if (check_add_overflow(off, sq_array_size, &off)) | |
8359 | return SIZE_MAX; | |
8360 | ||
75b28aff HV |
8361 | return off; |
8362 | } | |
8363 | ||
0a96bbe4 | 8364 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee JA |
8365 | { |
8366 | int i, j; | |
8367 | ||
8368 | if (!ctx->user_bufs) | |
8369 | return -ENXIO; | |
8370 | ||
8371 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8372 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8373 | ||
8374 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8375 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8376 | |
de293938 | 8377 | if (imu->acct_pages) |
26bfa89e | 8378 | io_unaccount_mem(ctx, imu->acct_pages); |
d4ef6475 | 8379 | kvfree(imu->bvec); |
edafccee JA |
8380 | imu->nr_bvecs = 0; |
8381 | } | |
8382 | ||
8383 | kfree(ctx->user_bufs); | |
8384 | ctx->user_bufs = NULL; | |
8385 | ctx->nr_user_bufs = 0; | |
8386 | return 0; | |
8387 | } | |
8388 | ||
8389 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8390 | void __user *arg, unsigned index) | |
8391 | { | |
8392 | struct iovec __user *src; | |
8393 | ||
8394 | #ifdef CONFIG_COMPAT | |
8395 | if (ctx->compat) { | |
8396 | struct compat_iovec __user *ciovs; | |
8397 | struct compat_iovec ciov; | |
8398 | ||
8399 | ciovs = (struct compat_iovec __user *) arg; | |
8400 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8401 | return -EFAULT; | |
8402 | ||
d55e5f5b | 8403 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8404 | dst->iov_len = ciov.iov_len; |
8405 | return 0; | |
8406 | } | |
8407 | #endif | |
8408 | src = (struct iovec __user *) arg; | |
8409 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8410 | return -EFAULT; | |
8411 | return 0; | |
8412 | } | |
8413 | ||
de293938 JA |
8414 | /* |
8415 | * Not super efficient, but this is just a registration time. And we do cache | |
8416 | * the last compound head, so generally we'll only do a full search if we don't | |
8417 | * match that one. | |
8418 | * | |
8419 | * We check if the given compound head page has already been accounted, to | |
8420 | * avoid double accounting it. This allows us to account the full size of the | |
8421 | * page, not just the constituent pages of a huge page. | |
8422 | */ | |
8423 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8424 | int nr_pages, struct page *hpage) | |
8425 | { | |
8426 | int i, j; | |
8427 | ||
8428 | /* check current page array */ | |
8429 | for (i = 0; i < nr_pages; i++) { | |
8430 | if (!PageCompound(pages[i])) | |
8431 | continue; | |
8432 | if (compound_head(pages[i]) == hpage) | |
8433 | return true; | |
8434 | } | |
8435 | ||
8436 | /* check previously registered pages */ | |
8437 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8438 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8439 | ||
8440 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8441 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8442 | continue; | |
8443 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8444 | return true; | |
8445 | } | |
8446 | } | |
8447 | ||
8448 | return false; | |
8449 | } | |
8450 | ||
8451 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8452 | int nr_pages, struct io_mapped_ubuf *imu, | |
8453 | struct page **last_hpage) | |
8454 | { | |
8455 | int i, ret; | |
8456 | ||
8457 | for (i = 0; i < nr_pages; i++) { | |
8458 | if (!PageCompound(pages[i])) { | |
8459 | imu->acct_pages++; | |
8460 | } else { | |
8461 | struct page *hpage; | |
8462 | ||
8463 | hpage = compound_head(pages[i]); | |
8464 | if (hpage == *last_hpage) | |
8465 | continue; | |
8466 | *last_hpage = hpage; | |
8467 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8468 | continue; | |
8469 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8470 | } | |
8471 | } | |
8472 | ||
8473 | if (!imu->acct_pages) | |
8474 | return 0; | |
8475 | ||
26bfa89e | 8476 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8477 | if (ret) |
8478 | imu->acct_pages = 0; | |
8479 | return ret; | |
8480 | } | |
8481 | ||
0a96bbe4 BM |
8482 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
8483 | struct io_mapped_ubuf *imu, | |
8484 | struct page **last_hpage) | |
edafccee JA |
8485 | { |
8486 | struct vm_area_struct **vmas = NULL; | |
8487 | struct page **pages = NULL; | |
0a96bbe4 BM |
8488 | unsigned long off, start, end, ubuf; |
8489 | size_t size; | |
8490 | int ret, pret, nr_pages, i; | |
8491 | ||
8492 | ubuf = (unsigned long) iov->iov_base; | |
8493 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8494 | start = ubuf >> PAGE_SHIFT; | |
8495 | nr_pages = end - start; | |
8496 | ||
8497 | ret = -ENOMEM; | |
8498 | ||
8499 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8500 | if (!pages) | |
8501 | goto done; | |
8502 | ||
8503 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8504 | GFP_KERNEL); | |
8505 | if (!vmas) | |
8506 | goto done; | |
8507 | ||
8508 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), | |
8509 | GFP_KERNEL); | |
8510 | if (!imu->bvec) | |
8511 | goto done; | |
8512 | ||
8513 | ret = 0; | |
8514 | mmap_read_lock(current->mm); | |
8515 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8516 | pages, vmas); | |
8517 | if (pret == nr_pages) { | |
8518 | /* don't support file backed memory */ | |
8519 | for (i = 0; i < nr_pages; i++) { | |
8520 | struct vm_area_struct *vma = vmas[i]; | |
8521 | ||
8522 | if (vma->vm_file && | |
8523 | !is_file_hugepages(vma->vm_file)) { | |
8524 | ret = -EOPNOTSUPP; | |
8525 | break; | |
8526 | } | |
8527 | } | |
8528 | } else { | |
8529 | ret = pret < 0 ? pret : -EFAULT; | |
8530 | } | |
8531 | mmap_read_unlock(current->mm); | |
8532 | if (ret) { | |
8533 | /* | |
8534 | * if we did partial map, or found file backed vmas, | |
8535 | * release any pages we did get | |
8536 | */ | |
8537 | if (pret > 0) | |
8538 | unpin_user_pages(pages, pret); | |
8539 | kvfree(imu->bvec); | |
8540 | goto done; | |
8541 | } | |
8542 | ||
8543 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8544 | if (ret) { | |
8545 | unpin_user_pages(pages, pret); | |
8546 | kvfree(imu->bvec); | |
8547 | goto done; | |
8548 | } | |
8549 | ||
8550 | off = ubuf & ~PAGE_MASK; | |
8551 | size = iov->iov_len; | |
8552 | for (i = 0; i < nr_pages; i++) { | |
8553 | size_t vec_len; | |
8554 | ||
8555 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8556 | imu->bvec[i].bv_page = pages[i]; | |
8557 | imu->bvec[i].bv_len = vec_len; | |
8558 | imu->bvec[i].bv_offset = off; | |
8559 | off = 0; | |
8560 | size -= vec_len; | |
8561 | } | |
8562 | /* store original address for later verification */ | |
8563 | imu->ubuf = ubuf; | |
8564 | imu->len = iov->iov_len; | |
8565 | imu->nr_bvecs = nr_pages; | |
8566 | ret = 0; | |
8567 | done: | |
8568 | kvfree(pages); | |
8569 | kvfree(vmas); | |
8570 | return ret; | |
8571 | } | |
8572 | ||
2b358604 | 8573 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8574 | { |
edafccee JA |
8575 | if (ctx->user_bufs) |
8576 | return -EBUSY; | |
8577 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8578 | return -EINVAL; | |
8579 | ||
8580 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8581 | GFP_KERNEL); | |
8582 | if (!ctx->user_bufs) | |
8583 | return -ENOMEM; | |
8584 | ||
2b358604 BM |
8585 | return 0; |
8586 | } | |
8587 | ||
8588 | static int io_buffer_validate(struct iovec *iov) | |
8589 | { | |
8590 | /* | |
8591 | * Don't impose further limits on the size and buffer | |
8592 | * constraints here, we'll -EINVAL later when IO is | |
8593 | * submitted if they are wrong. | |
8594 | */ | |
8595 | if (!iov->iov_base || !iov->iov_len) | |
8596 | return -EFAULT; | |
8597 | ||
8598 | /* arbitrary limit, but we need something */ | |
8599 | if (iov->iov_len > SZ_1G) | |
8600 | return -EFAULT; | |
8601 | ||
8602 | return 0; | |
8603 | } | |
8604 | ||
8605 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, | |
8606 | unsigned int nr_args) | |
8607 | { | |
8608 | int i, ret; | |
8609 | struct iovec iov; | |
8610 | struct page *last_hpage = NULL; | |
8611 | ||
8612 | ret = io_buffers_map_alloc(ctx, nr_args); | |
8613 | if (ret) | |
8614 | return ret; | |
8615 | ||
edafccee JA |
8616 | for (i = 0; i < nr_args; i++) { |
8617 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
edafccee JA |
8618 | |
8619 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8620 | if (ret) | |
0a96bbe4 | 8621 | break; |
edafccee | 8622 | |
2b358604 BM |
8623 | ret = io_buffer_validate(&iov); |
8624 | if (ret) | |
0a96bbe4 | 8625 | break; |
edafccee | 8626 | |
0a96bbe4 BM |
8627 | ret = io_sqe_buffer_register(ctx, &iov, imu, &last_hpage); |
8628 | if (ret) | |
8629 | break; | |
edafccee JA |
8630 | |
8631 | ctx->nr_user_bufs++; | |
8632 | } | |
0a96bbe4 BM |
8633 | |
8634 | if (ret) | |
8635 | io_sqe_buffers_unregister(ctx); | |
8636 | ||
edafccee JA |
8637 | return ret; |
8638 | } | |
8639 | ||
9b402849 JA |
8640 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8641 | { | |
8642 | __s32 __user *fds = arg; | |
8643 | int fd; | |
8644 | ||
8645 | if (ctx->cq_ev_fd) | |
8646 | return -EBUSY; | |
8647 | ||
8648 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8649 | return -EFAULT; | |
8650 | ||
8651 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8652 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8653 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8654 | ctx->cq_ev_fd = NULL; | |
8655 | return ret; | |
8656 | } | |
8657 | ||
8658 | return 0; | |
8659 | } | |
8660 | ||
8661 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8662 | { | |
8663 | if (ctx->cq_ev_fd) { | |
8664 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8665 | ctx->cq_ev_fd = NULL; | |
8666 | return 0; | |
8667 | } | |
8668 | ||
8669 | return -ENXIO; | |
8670 | } | |
8671 | ||
5a2e745d JA |
8672 | static int __io_destroy_buffers(int id, void *p, void *data) |
8673 | { | |
8674 | struct io_ring_ctx *ctx = data; | |
8675 | struct io_buffer *buf = p; | |
8676 | ||
067524e9 | 8677 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8678 | return 0; |
8679 | } | |
8680 | ||
8681 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8682 | { | |
8683 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8684 | idr_destroy(&ctx->io_buffer_idr); | |
8685 | } | |
8686 | ||
68e68ee6 | 8687 | static void io_req_cache_free(struct list_head *list, struct task_struct *tsk) |
1b4c351f | 8688 | { |
68e68ee6 | 8689 | struct io_kiocb *req, *nxt; |
1b4c351f | 8690 | |
68e68ee6 JA |
8691 | list_for_each_entry_safe(req, nxt, list, compl.list) { |
8692 | if (tsk && req->task != tsk) | |
8693 | continue; | |
1b4c351f JA |
8694 | list_del(&req->compl.list); |
8695 | kmem_cache_free(req_cachep, req); | |
8696 | } | |
8697 | } | |
8698 | ||
9a4fdbd8 | 8699 | static void io_req_caches_free(struct io_ring_ctx *ctx, struct task_struct *tsk) |
2b188cc1 | 8700 | { |
bf019da7 PB |
8701 | struct io_submit_state *submit_state = &ctx->submit_state; |
8702 | ||
9a4fdbd8 JA |
8703 | mutex_lock(&ctx->uring_lock); |
8704 | ||
8705 | if (submit_state->free_reqs) | |
8706 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, | |
8707 | submit_state->reqs); | |
8708 | ||
8709 | io_req_cache_free(&submit_state->comp.free_list, NULL); | |
8710 | ||
8711 | spin_lock_irq(&ctx->completion_lock); | |
8712 | io_req_cache_free(&submit_state->comp.locked_free_list, NULL); | |
8713 | spin_unlock_irq(&ctx->completion_lock); | |
8714 | ||
8715 | mutex_unlock(&ctx->uring_lock); | |
8716 | } | |
8717 | ||
8718 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) | |
8719 | { | |
04fc6c80 PB |
8720 | /* |
8721 | * Some may use context even when all refs and requests have been put, | |
8722 | * and they are free to do so while still holding uring_lock, see | |
8723 | * __io_req_task_submit(). Wait for them to finish. | |
8724 | */ | |
8725 | mutex_lock(&ctx->uring_lock); | |
8726 | mutex_unlock(&ctx->uring_lock); | |
8727 | ||
6b06314c | 8728 | io_finish_async(ctx); |
0a96bbe4 | 8729 | io_sqe_buffers_unregister(ctx); |
2aede0e4 JA |
8730 | |
8731 | if (ctx->sqo_task) { | |
8732 | put_task_struct(ctx->sqo_task); | |
8733 | ctx->sqo_task = NULL; | |
8734 | mmdrop(ctx->mm_account); | |
8735 | ctx->mm_account = NULL; | |
30975825 | 8736 | } |
def596e9 | 8737 | |
91d8f519 DZ |
8738 | #ifdef CONFIG_BLK_CGROUP |
8739 | if (ctx->sqo_blkcg_css) | |
8740 | css_put(ctx->sqo_blkcg_css); | |
8741 | #endif | |
8742 | ||
6b06314c | 8743 | io_sqe_files_unregister(ctx); |
9b402849 | 8744 | io_eventfd_unregister(ctx); |
5a2e745d | 8745 | io_destroy_buffers(ctx); |
41726c9a | 8746 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8747 | |
2b188cc1 | 8748 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8749 | if (ctx->ring_sock) { |
8750 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8751 | sock_release(ctx->ring_sock); |
355e8d26 | 8752 | } |
2b188cc1 JA |
8753 | #endif |
8754 | ||
75b28aff | 8755 | io_mem_free(ctx->rings); |
2b188cc1 | 8756 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8757 | |
8758 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8759 | free_uid(ctx->user); |
181e448d | 8760 | put_cred(ctx->creds); |
9a4fdbd8 | 8761 | io_req_caches_free(ctx, NULL); |
78076bb6 | 8762 | kfree(ctx->cancel_hash); |
2b188cc1 JA |
8763 | kfree(ctx); |
8764 | } | |
8765 | ||
8766 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8767 | { | |
8768 | struct io_ring_ctx *ctx = file->private_data; | |
8769 | __poll_t mask = 0; | |
8770 | ||
8771 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8772 | /* |
8773 | * synchronizes with barrier from wq_has_sleeper call in | |
8774 | * io_commit_cqring | |
8775 | */ | |
2b188cc1 | 8776 | smp_rmb(); |
90554200 | 8777 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8778 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8779 | |
8780 | /* | |
8781 | * Don't flush cqring overflow list here, just do a simple check. | |
8782 | * Otherwise there could possible be ABBA deadlock: | |
8783 | * CPU0 CPU1 | |
8784 | * ---- ---- | |
8785 | * lock(&ctx->uring_lock); | |
8786 | * lock(&ep->mtx); | |
8787 | * lock(&ctx->uring_lock); | |
8788 | * lock(&ep->mtx); | |
8789 | * | |
8790 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8791 | * pushs them to do the flush. | |
8792 | */ | |
8793 | if (io_cqring_events(ctx) || test_bit(0, &ctx->cq_check_overflow)) | |
2b188cc1 JA |
8794 | mask |= EPOLLIN | EPOLLRDNORM; |
8795 | ||
8796 | return mask; | |
8797 | } | |
8798 | ||
8799 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8800 | { | |
8801 | struct io_ring_ctx *ctx = file->private_data; | |
8802 | ||
8803 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8804 | } | |
8805 | ||
0bead8cd | 8806 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8807 | { |
1e6fa521 | 8808 | struct io_identity *iod; |
071698e1 | 8809 | |
1e6fa521 JA |
8810 | iod = idr_remove(&ctx->personality_idr, id); |
8811 | if (iod) { | |
8812 | put_cred(iod->creds); | |
8813 | if (refcount_dec_and_test(&iod->count)) | |
8814 | kfree(iod); | |
0bead8cd | 8815 | return 0; |
1e6fa521 | 8816 | } |
0bead8cd YD |
8817 | |
8818 | return -EINVAL; | |
8819 | } | |
8820 | ||
8821 | static int io_remove_personalities(int id, void *p, void *data) | |
8822 | { | |
8823 | struct io_ring_ctx *ctx = data; | |
8824 | ||
8825 | io_unregister_personality(ctx, id); | |
071698e1 JA |
8826 | return 0; |
8827 | } | |
8828 | ||
85faa7b8 JA |
8829 | static void io_ring_exit_work(struct work_struct *work) |
8830 | { | |
b2edc0a7 PB |
8831 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8832 | exit_work); | |
85faa7b8 | 8833 | |
56952e91 JA |
8834 | /* |
8835 | * If we're doing polled IO and end up having requests being | |
8836 | * submitted async (out-of-line), then completions can come in while | |
8837 | * we're waiting for refs to drop. We need to reap these manually, | |
8838 | * as nobody else will be looking for them. | |
8839 | */ | |
b2edc0a7 | 8840 | do { |
9936c7c2 | 8841 | io_uring_try_cancel_requests(ctx, NULL, NULL); |
b2edc0a7 | 8842 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
85faa7b8 JA |
8843 | io_ring_ctx_free(ctx); |
8844 | } | |
8845 | ||
00c18640 JA |
8846 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8847 | { | |
8848 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8849 | ||
8850 | return req->ctx == data; | |
8851 | } | |
8852 | ||
2b188cc1 JA |
8853 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8854 | { | |
8855 | mutex_lock(&ctx->uring_lock); | |
8856 | percpu_ref_kill(&ctx->refs); | |
d9d05217 PB |
8857 | |
8858 | if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead)) | |
8859 | ctx->sqo_dead = 1; | |
8860 | ||
cda286f0 PB |
8861 | /* if force is set, the ring is going away. always drop after that */ |
8862 | ctx->cq_overflow_flushed = 1; | |
634578f8 | 8863 | if (ctx->rings) |
6c503150 | 8864 | __io_cqring_overflow_flush(ctx, true, NULL, NULL); |
5c766a90 | 8865 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
2b188cc1 JA |
8866 | mutex_unlock(&ctx->uring_lock); |
8867 | ||
6b81928d PB |
8868 | io_kill_timeouts(ctx, NULL, NULL); |
8869 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8870 | |
8871 | if (ctx->io_wq) | |
00c18640 | 8872 | io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true); |
561fb04a | 8873 | |
15dff286 | 8874 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8875 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8876 | |
85faa7b8 | 8877 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8878 | /* |
8879 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8880 | * if we're exiting a ton of rings at the same time. It just adds | |
8881 | * noise and overhead, there's no discernable change in runtime | |
8882 | * over using system_wq. | |
8883 | */ | |
8884 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8885 | } |
8886 | ||
8887 | static int io_uring_release(struct inode *inode, struct file *file) | |
8888 | { | |
8889 | struct io_ring_ctx *ctx = file->private_data; | |
8890 | ||
8891 | file->private_data = NULL; | |
8892 | io_ring_ctx_wait_and_kill(ctx); | |
8893 | return 0; | |
8894 | } | |
8895 | ||
f6edbabb PB |
8896 | struct io_task_cancel { |
8897 | struct task_struct *task; | |
8898 | struct files_struct *files; | |
8899 | }; | |
f254ac04 | 8900 | |
f6edbabb | 8901 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8902 | { |
9a472ef7 | 8903 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8904 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8905 | bool ret; |
8906 | ||
f6edbabb | 8907 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8908 | unsigned long flags; |
8909 | struct io_ring_ctx *ctx = req->ctx; | |
8910 | ||
8911 | /* protect against races with linked timeouts */ | |
8912 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8913 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8914 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8915 | } else { | |
f6edbabb | 8916 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8917 | } |
8918 | return ret; | |
b711d4ea JA |
8919 | } |
8920 | ||
b7ddce3c | 8921 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8922 | struct task_struct *task, |
b7ddce3c PB |
8923 | struct files_struct *files) |
8924 | { | |
8925 | struct io_defer_entry *de = NULL; | |
8926 | LIST_HEAD(list); | |
8927 | ||
8928 | spin_lock_irq(&ctx->completion_lock); | |
8929 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8930 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8931 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8932 | break; | |
8933 | } | |
8934 | } | |
8935 | spin_unlock_irq(&ctx->completion_lock); | |
8936 | ||
8937 | while (!list_empty(&list)) { | |
8938 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8939 | list_del_init(&de->list); | |
8940 | req_set_fail_links(de->req); | |
8941 | io_put_req(de->req); | |
8942 | io_req_complete(de->req, -ECANCELED); | |
8943 | kfree(de); | |
8944 | } | |
8945 | } | |
8946 | ||
9936c7c2 PB |
8947 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
8948 | struct task_struct *task, | |
8949 | struct files_struct *files) | |
8950 | { | |
8951 | struct io_task_cancel cancel = { .task = task, .files = files, }; | |
8952 | ||
8953 | while (1) { | |
8954 | enum io_wq_cancel cret; | |
8955 | bool ret = false; | |
8956 | ||
8957 | if (ctx->io_wq) { | |
8958 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, | |
8959 | &cancel, true); | |
8960 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8961 | } | |
8962 | ||
8963 | /* SQPOLL thread does its own polling */ | |
8964 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && !files) { | |
8965 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8966 | io_iopoll_try_reap_events(ctx); | |
8967 | ret = true; | |
8968 | } | |
8969 | } | |
8970 | ||
8971 | ret |= io_poll_remove_all(ctx, task, files); | |
8972 | ret |= io_kill_timeouts(ctx, task, files); | |
8973 | ret |= io_run_task_work(); | |
8974 | io_cqring_overflow_flush(ctx, true, task, files); | |
8975 | if (!ret) | |
8976 | break; | |
8977 | cond_resched(); | |
8978 | } | |
8979 | } | |
8980 | ||
ca70f00b PB |
8981 | static int io_uring_count_inflight(struct io_ring_ctx *ctx, |
8982 | struct task_struct *task, | |
8983 | struct files_struct *files) | |
8984 | { | |
8985 | struct io_kiocb *req; | |
8986 | int cnt = 0; | |
8987 | ||
8988 | spin_lock_irq(&ctx->inflight_lock); | |
8989 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) | |
8990 | cnt += io_match_task(req, task, files); | |
8991 | spin_unlock_irq(&ctx->inflight_lock); | |
8992 | return cnt; | |
8993 | } | |
8994 | ||
b52fda00 | 8995 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8996 | struct task_struct *task, |
fcb323cc JA |
8997 | struct files_struct *files) |
8998 | { | |
fcb323cc | 8999 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 | 9000 | DEFINE_WAIT(wait); |
ca70f00b | 9001 | int inflight; |
fcb323cc | 9002 | |
ca70f00b PB |
9003 | inflight = io_uring_count_inflight(ctx, task, files); |
9004 | if (!inflight) | |
fcb323cc | 9005 | break; |
f6edbabb | 9006 | |
9936c7c2 | 9007 | io_uring_try_cancel_requests(ctx, task, files); |
34343786 PB |
9008 | |
9009 | if (ctx->sq_data) | |
9010 | io_sq_thread_unpark(ctx->sq_data); | |
ca70f00b PB |
9011 | prepare_to_wait(&task->io_uring->wait, &wait, |
9012 | TASK_UNINTERRUPTIBLE); | |
9013 | if (inflight == io_uring_count_inflight(ctx, task, files)) | |
9014 | schedule(); | |
c98de08c | 9015 | finish_wait(&task->io_uring->wait, &wait); |
34343786 PB |
9016 | if (ctx->sq_data) |
9017 | io_sq_thread_park(ctx->sq_data); | |
fcb323cc | 9018 | } |
44e728b8 PB |
9019 | } |
9020 | ||
d9d05217 PB |
9021 | static void io_disable_sqo_submit(struct io_ring_ctx *ctx) |
9022 | { | |
d9d05217 PB |
9023 | mutex_lock(&ctx->uring_lock); |
9024 | ctx->sqo_dead = 1; | |
9025 | mutex_unlock(&ctx->uring_lock); | |
9026 | ||
9027 | /* make sure callers enter the ring to get error */ | |
b4411616 PB |
9028 | if (ctx->rings) |
9029 | io_ring_set_wakeup_flag(ctx); | |
d9d05217 PB |
9030 | } |
9031 | ||
0f212204 JA |
9032 | /* |
9033 | * We need to iteratively cancel requests, in case a request has dependent | |
9034 | * hard links. These persist even for failure of cancelations, hence keep | |
9035 | * looping until none are found. | |
9036 | */ | |
9037 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
9038 | struct files_struct *files) | |
9039 | { | |
9040 | struct task_struct *task = current; | |
9041 | ||
fdaf083c | 9042 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
d9d05217 | 9043 | io_disable_sqo_submit(ctx); |
534ca6d6 | 9044 | task = ctx->sq_data->thread; |
fdaf083c JA |
9045 | atomic_inc(&task->io_uring->in_idle); |
9046 | io_sq_thread_park(ctx->sq_data); | |
9047 | } | |
0f212204 | 9048 | |
df9923f9 | 9049 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 9050 | |
3a7efd1a | 9051 | io_uring_cancel_files(ctx, task, files); |
b52fda00 | 9052 | if (!files) |
9936c7c2 | 9053 | io_uring_try_cancel_requests(ctx, task, NULL); |
fdaf083c JA |
9054 | |
9055 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
9056 | atomic_dec(&task->io_uring->in_idle); | |
9057 | /* | |
9058 | * If the files that are going away are the ones in the thread | |
9059 | * identity, clear them out. | |
9060 | */ | |
9061 | if (task->io_uring->identity->files == files) | |
9062 | task->io_uring->identity->files = NULL; | |
9063 | io_sq_thread_unpark(ctx->sq_data); | |
9064 | } | |
0f212204 JA |
9065 | } |
9066 | ||
9067 | /* | |
9068 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9069 | */ | |
fdaf083c | 9070 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 9071 | { |
236434c3 | 9072 | struct io_uring_task *tctx = current->io_uring; |
a528b04e | 9073 | int ret; |
236434c3 MWO |
9074 | |
9075 | if (unlikely(!tctx)) { | |
0f212204 JA |
9076 | ret = io_uring_alloc_task_context(current); |
9077 | if (unlikely(ret)) | |
9078 | return ret; | |
236434c3 | 9079 | tctx = current->io_uring; |
0f212204 | 9080 | } |
236434c3 MWO |
9081 | if (tctx->last != file) { |
9082 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 9083 | |
236434c3 | 9084 | if (!old) { |
0f212204 | 9085 | get_file(file); |
a528b04e PB |
9086 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)file, |
9087 | file, GFP_KERNEL)); | |
9088 | if (ret) { | |
9089 | fput(file); | |
9090 | return ret; | |
9091 | } | |
ecfc8492 PB |
9092 | |
9093 | /* one and only SQPOLL file note, held by sqo_task */ | |
9094 | WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && | |
9095 | current != ctx->sqo_task); | |
0f212204 | 9096 | } |
236434c3 | 9097 | tctx->last = file; |
0f212204 JA |
9098 | } |
9099 | ||
fdaf083c JA |
9100 | /* |
9101 | * This is race safe in that the task itself is doing this, hence it | |
9102 | * cannot be going through the exit/cancel paths at the same time. | |
9103 | * This cannot be modified while exit/cancel is running. | |
9104 | */ | |
9105 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
9106 | tctx->sqpoll = true; | |
9107 | ||
0f212204 JA |
9108 | return 0; |
9109 | } | |
9110 | ||
9111 | /* | |
9112 | * Remove this io_uring_file -> task mapping. | |
9113 | */ | |
9114 | static void io_uring_del_task_file(struct file *file) | |
9115 | { | |
9116 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
9117 | |
9118 | if (tctx->last == file) | |
9119 | tctx->last = NULL; | |
5e2ed8c4 | 9120 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
9121 | if (file) |
9122 | fput(file); | |
9123 | } | |
9124 | ||
de7f1d9e PB |
9125 | static void io_uring_remove_task_files(struct io_uring_task *tctx) |
9126 | { | |
9127 | struct file *file; | |
9128 | unsigned long index; | |
9129 | ||
9130 | xa_for_each(&tctx->xa, index, file) | |
9131 | io_uring_del_task_file(file); | |
9132 | } | |
9133 | ||
0f212204 JA |
9134 | void __io_uring_files_cancel(struct files_struct *files) |
9135 | { | |
9136 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
9137 | struct file *file; |
9138 | unsigned long index; | |
0f212204 JA |
9139 | |
9140 | /* make sure overflow events are dropped */ | |
fdaf083c | 9141 | atomic_inc(&tctx->in_idle); |
de7f1d9e PB |
9142 | xa_for_each(&tctx->xa, index, file) |
9143 | io_uring_cancel_task_requests(file->private_data, files); | |
fdaf083c | 9144 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9145 | |
9146 | if (files) | |
9147 | io_uring_remove_task_files(tctx); | |
fdaf083c JA |
9148 | } |
9149 | ||
9150 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
9151 | { | |
0e9ddb39 PB |
9152 | return percpu_counter_sum(&tctx->inflight); |
9153 | } | |
fdaf083c | 9154 | |
0e9ddb39 PB |
9155 | static void io_uring_cancel_sqpoll(struct io_ring_ctx *ctx) |
9156 | { | |
9157 | struct io_uring_task *tctx; | |
9158 | s64 inflight; | |
9159 | DEFINE_WAIT(wait); | |
fdaf083c | 9160 | |
0e9ddb39 PB |
9161 | if (!ctx->sq_data) |
9162 | return; | |
9163 | tctx = ctx->sq_data->thread->io_uring; | |
9164 | io_disable_sqo_submit(ctx); | |
fdaf083c | 9165 | |
0e9ddb39 PB |
9166 | atomic_inc(&tctx->in_idle); |
9167 | do { | |
9168 | /* read completions before cancelations */ | |
9169 | inflight = tctx_inflight(tctx); | |
9170 | if (!inflight) | |
9171 | break; | |
9172 | io_uring_cancel_task_requests(ctx, NULL); | |
fdaf083c | 9173 | |
0e9ddb39 PB |
9174 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
9175 | /* | |
9176 | * If we've seen completions, retry without waiting. This | |
9177 | * avoids a race where a completion comes in before we did | |
9178 | * prepare_to_wait(). | |
9179 | */ | |
9180 | if (inflight == tctx_inflight(tctx)) | |
9181 | schedule(); | |
9182 | finish_wait(&tctx->wait, &wait); | |
9183 | } while (1); | |
9184 | atomic_dec(&tctx->in_idle); | |
0f212204 JA |
9185 | } |
9186 | ||
0f212204 JA |
9187 | /* |
9188 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
9189 | * requests. | |
9190 | */ | |
9191 | void __io_uring_task_cancel(void) | |
9192 | { | |
9193 | struct io_uring_task *tctx = current->io_uring; | |
9194 | DEFINE_WAIT(wait); | |
d8a6df10 | 9195 | s64 inflight; |
0f212204 JA |
9196 | |
9197 | /* make sure overflow events are dropped */ | |
fdaf083c | 9198 | atomic_inc(&tctx->in_idle); |
0f212204 | 9199 | |
0b5cd6c3 | 9200 | /* trigger io_disable_sqo_submit() */ |
0e9ddb39 PB |
9201 | if (tctx->sqpoll) { |
9202 | struct file *file; | |
9203 | unsigned long index; | |
9204 | ||
9205 | xa_for_each(&tctx->xa, index, file) | |
9206 | io_uring_cancel_sqpoll(file->private_data); | |
9207 | } | |
0b5cd6c3 | 9208 | |
d8a6df10 | 9209 | do { |
0f212204 | 9210 | /* read completions before cancelations */ |
fdaf083c | 9211 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9212 | if (!inflight) |
9213 | break; | |
0f212204 JA |
9214 | __io_uring_files_cancel(NULL); |
9215 | ||
9216 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9217 | ||
9218 | /* | |
a1bb3cd5 PB |
9219 | * If we've seen completions, retry without waiting. This |
9220 | * avoids a race where a completion comes in before we did | |
9221 | * prepare_to_wait(). | |
0f212204 | 9222 | */ |
a1bb3cd5 PB |
9223 | if (inflight == tctx_inflight(tctx)) |
9224 | schedule(); | |
f57555ed | 9225 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9226 | } while (1); |
0f212204 | 9227 | |
fdaf083c | 9228 | atomic_dec(&tctx->in_idle); |
de7f1d9e PB |
9229 | |
9230 | io_uring_remove_task_files(tctx); | |
44e728b8 PB |
9231 | } |
9232 | ||
fcb323cc JA |
9233 | static int io_uring_flush(struct file *file, void *data) |
9234 | { | |
6b5733eb | 9235 | struct io_uring_task *tctx = current->io_uring; |
d9d05217 | 9236 | struct io_ring_ctx *ctx = file->private_data; |
6b5733eb | 9237 | |
41be53e9 | 9238 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) { |
84965ff8 | 9239 | io_uring_cancel_task_requests(ctx, NULL); |
41be53e9 JA |
9240 | io_req_caches_free(ctx, current); |
9241 | } | |
84965ff8 | 9242 | |
6b5733eb | 9243 | if (!tctx) |
4f793dc4 PB |
9244 | return 0; |
9245 | ||
6b5733eb PB |
9246 | /* we should have cancelled and erased it before PF_EXITING */ |
9247 | WARN_ON_ONCE((current->flags & PF_EXITING) && | |
9248 | xa_load(&tctx->xa, (unsigned long)file)); | |
9249 | ||
4f793dc4 PB |
9250 | /* |
9251 | * fput() is pending, will be 2 if the only other ref is our potential | |
9252 | * task file note. If the task is exiting, drop regardless of count. | |
9253 | */ | |
6b5733eb PB |
9254 | if (atomic_long_read(&file->f_count) != 2) |
9255 | return 0; | |
4f793dc4 | 9256 | |
d9d05217 PB |
9257 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
9258 | /* there is only one file note, which is owned by sqo_task */ | |
4325cb49 PB |
9259 | WARN_ON_ONCE(ctx->sqo_task != current && |
9260 | xa_load(&tctx->xa, (unsigned long)file)); | |
9261 | /* sqo_dead check is for when this happens after cancellation */ | |
9262 | WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead && | |
d9d05217 PB |
9263 | !xa_load(&tctx->xa, (unsigned long)file)); |
9264 | ||
9265 | io_disable_sqo_submit(ctx); | |
9266 | } | |
9267 | ||
9268 | if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current) | |
9269 | io_uring_del_task_file(file); | |
fcb323cc JA |
9270 | return 0; |
9271 | } | |
9272 | ||
6c5c240e RP |
9273 | static void *io_uring_validate_mmap_request(struct file *file, |
9274 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9275 | { |
2b188cc1 | 9276 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9277 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9278 | struct page *page; |
9279 | void *ptr; | |
9280 | ||
9281 | switch (offset) { | |
9282 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9283 | case IORING_OFF_CQ_RING: |
9284 | ptr = ctx->rings; | |
2b188cc1 JA |
9285 | break; |
9286 | case IORING_OFF_SQES: | |
9287 | ptr = ctx->sq_sqes; | |
9288 | break; | |
2b188cc1 | 9289 | default: |
6c5c240e | 9290 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9291 | } |
9292 | ||
9293 | page = virt_to_head_page(ptr); | |
a50b854e | 9294 | if (sz > page_size(page)) |
6c5c240e RP |
9295 | return ERR_PTR(-EINVAL); |
9296 | ||
9297 | return ptr; | |
9298 | } | |
9299 | ||
9300 | #ifdef CONFIG_MMU | |
9301 | ||
9302 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9303 | { | |
9304 | size_t sz = vma->vm_end - vma->vm_start; | |
9305 | unsigned long pfn; | |
9306 | void *ptr; | |
9307 | ||
9308 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9309 | if (IS_ERR(ptr)) | |
9310 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9311 | |
9312 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9313 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9314 | } | |
9315 | ||
6c5c240e RP |
9316 | #else /* !CONFIG_MMU */ |
9317 | ||
9318 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9319 | { | |
9320 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9321 | } | |
9322 | ||
9323 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9324 | { | |
9325 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9326 | } | |
9327 | ||
9328 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9329 | unsigned long addr, unsigned long len, | |
9330 | unsigned long pgoff, unsigned long flags) | |
9331 | { | |
9332 | void *ptr; | |
9333 | ||
9334 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9335 | if (IS_ERR(ptr)) | |
9336 | return PTR_ERR(ptr); | |
9337 | ||
9338 | return (unsigned long) ptr; | |
9339 | } | |
9340 | ||
9341 | #endif /* !CONFIG_MMU */ | |
9342 | ||
d9d05217 | 9343 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 | 9344 | { |
d9d05217 | 9345 | int ret = 0; |
90554200 JA |
9346 | DEFINE_WAIT(wait); |
9347 | ||
9348 | do { | |
9349 | if (!io_sqring_full(ctx)) | |
9350 | break; | |
9351 | ||
9352 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9353 | ||
d9d05217 PB |
9354 | if (unlikely(ctx->sqo_dead)) { |
9355 | ret = -EOWNERDEAD; | |
9356 | goto out; | |
9357 | } | |
9358 | ||
90554200 JA |
9359 | if (!io_sqring_full(ctx)) |
9360 | break; | |
9361 | ||
9362 | schedule(); | |
9363 | } while (!signal_pending(current)); | |
9364 | ||
9365 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
d9d05217 PB |
9366 | out: |
9367 | return ret; | |
90554200 JA |
9368 | } |
9369 | ||
c73ebb68 HX |
9370 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9371 | struct __kernel_timespec __user **ts, | |
9372 | const sigset_t __user **sig) | |
9373 | { | |
9374 | struct io_uring_getevents_arg arg; | |
9375 | ||
9376 | /* | |
9377 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9378 | * is just a pointer to the sigset_t. | |
9379 | */ | |
9380 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9381 | *sig = (const sigset_t __user *) argp; | |
9382 | *ts = NULL; | |
9383 | return 0; | |
9384 | } | |
9385 | ||
9386 | /* | |
9387 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9388 | * timespec and sigset_t pointers if good. | |
9389 | */ | |
9390 | if (*argsz != sizeof(arg)) | |
9391 | return -EINVAL; | |
9392 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9393 | return -EFAULT; | |
9394 | *sig = u64_to_user_ptr(arg.sigmask); | |
9395 | *argsz = arg.sigmask_sz; | |
9396 | *ts = u64_to_user_ptr(arg.ts); | |
9397 | return 0; | |
9398 | } | |
9399 | ||
2b188cc1 | 9400 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9401 | u32, min_complete, u32, flags, const void __user *, argp, |
9402 | size_t, argsz) | |
2b188cc1 JA |
9403 | { |
9404 | struct io_ring_ctx *ctx; | |
9405 | long ret = -EBADF; | |
9406 | int submitted = 0; | |
9407 | struct fd f; | |
9408 | ||
4c6e277c | 9409 | io_run_task_work(); |
b41e9852 | 9410 | |
90554200 | 9411 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9412 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9413 | return -EINVAL; |
9414 | ||
9415 | f = fdget(fd); | |
9416 | if (!f.file) | |
9417 | return -EBADF; | |
9418 | ||
9419 | ret = -EOPNOTSUPP; | |
9420 | if (f.file->f_op != &io_uring_fops) | |
9421 | goto out_fput; | |
9422 | ||
9423 | ret = -ENXIO; | |
9424 | ctx = f.file->private_data; | |
9425 | if (!percpu_ref_tryget(&ctx->refs)) | |
9426 | goto out_fput; | |
9427 | ||
7e84e1c7 SG |
9428 | ret = -EBADFD; |
9429 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9430 | goto out; | |
9431 | ||
6c271ce2 JA |
9432 | /* |
9433 | * For SQ polling, the thread will do all submissions and completions. | |
9434 | * Just return the requested submit count, and wake the thread if | |
9435 | * we were asked to. | |
9436 | */ | |
b2a9eada | 9437 | ret = 0; |
6c271ce2 | 9438 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c503150 | 9439 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
89448c47 | 9440 | |
d9d05217 PB |
9441 | ret = -EOWNERDEAD; |
9442 | if (unlikely(ctx->sqo_dead)) | |
9443 | goto out; | |
6c271ce2 | 9444 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9445 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9446 | if (flags & IORING_ENTER_SQ_WAIT) { |
9447 | ret = io_sqpoll_wait_sq(ctx); | |
9448 | if (ret) | |
9449 | goto out; | |
9450 | } | |
6c271ce2 | 9451 | submitted = to_submit; |
b2a9eada | 9452 | } else if (to_submit) { |
fdaf083c | 9453 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9454 | if (unlikely(ret)) |
9455 | goto out; | |
2b188cc1 | 9456 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9457 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9458 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9459 | |
9460 | if (submitted != to_submit) | |
9461 | goto out; | |
2b188cc1 JA |
9462 | } |
9463 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9464 | const sigset_t __user *sig; |
9465 | struct __kernel_timespec __user *ts; | |
9466 | ||
9467 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9468 | if (unlikely(ret)) | |
9469 | goto out; | |
9470 | ||
2b188cc1 JA |
9471 | min_complete = min(min_complete, ctx->cq_entries); |
9472 | ||
32b2244a XW |
9473 | /* |
9474 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9475 | * space applications don't need to do io completion events | |
9476 | * polling again, they can rely on io_sq_thread to do polling | |
9477 | * work, which can reduce cpu usage and uring_lock contention. | |
9478 | */ | |
9479 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9480 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9481 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9482 | } else { |
c73ebb68 | 9483 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9484 | } |
2b188cc1 JA |
9485 | } |
9486 | ||
7c504e65 | 9487 | out: |
6805b32e | 9488 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9489 | out_fput: |
9490 | fdput(f); | |
9491 | return submitted ? submitted : ret; | |
9492 | } | |
9493 | ||
bebdb65e | 9494 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9495 | static int io_uring_show_cred(int id, void *p, void *data) |
9496 | { | |
6b47ab81 JA |
9497 | struct io_identity *iod = p; |
9498 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9499 | struct seq_file *m = data; |
9500 | struct user_namespace *uns = seq_user_ns(m); | |
9501 | struct group_info *gi; | |
9502 | kernel_cap_t cap; | |
9503 | unsigned __capi; | |
9504 | int g; | |
9505 | ||
9506 | seq_printf(m, "%5d\n", id); | |
9507 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9508 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9509 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9510 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9511 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9512 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9513 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9514 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9515 | seq_puts(m, "\n\tGroups:\t"); | |
9516 | gi = cred->group_info; | |
9517 | for (g = 0; g < gi->ngroups; g++) { | |
9518 | seq_put_decimal_ull(m, g ? " " : "", | |
9519 | from_kgid_munged(uns, gi->gid[g])); | |
9520 | } | |
9521 | seq_puts(m, "\n\tCapEff:\t"); | |
9522 | cap = cred->cap_effective; | |
9523 | CAP_FOR_EACH_U32(__capi) | |
9524 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9525 | seq_putc(m, '\n'); | |
9526 | return 0; | |
9527 | } | |
9528 | ||
9529 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9530 | { | |
dbbe9c64 | 9531 | struct io_sq_data *sq = NULL; |
fad8e0de | 9532 | bool has_lock; |
87ce955b JA |
9533 | int i; |
9534 | ||
fad8e0de JA |
9535 | /* |
9536 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9537 | * since fdinfo case grabs it in the opposite direction of normal use | |
9538 | * cases. If we fail to get the lock, we just don't iterate any | |
9539 | * structures that could be going away outside the io_uring mutex. | |
9540 | */ | |
9541 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9542 | ||
dbbe9c64 JQ |
9543 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9544 | sq = ctx->sq_data; | |
9545 | ||
9546 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9547 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9548 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9549 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
ea64ec02 | 9550 | struct file *f = *io_fixed_file_slot(ctx->file_data, i); |
87ce955b | 9551 | |
87ce955b JA |
9552 | if (f) |
9553 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9554 | else | |
9555 | seq_printf(m, "%5u: <none>\n", i); | |
9556 | } | |
9557 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9558 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9559 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9560 | ||
9561 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9562 | (unsigned int) buf->len); | |
9563 | } | |
fad8e0de | 9564 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9565 | seq_printf(m, "Personalities:\n"); |
9566 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9567 | } | |
d7718a9d JA |
9568 | seq_printf(m, "PollList:\n"); |
9569 | spin_lock_irq(&ctx->completion_lock); | |
9570 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9571 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9572 | struct io_kiocb *req; | |
9573 | ||
9574 | hlist_for_each_entry(req, list, hash_node) | |
9575 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9576 | req->task->task_works != NULL); | |
9577 | } | |
9578 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9579 | if (has_lock) |
9580 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9581 | } |
9582 | ||
9583 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9584 | { | |
9585 | struct io_ring_ctx *ctx = f->private_data; | |
9586 | ||
9587 | if (percpu_ref_tryget(&ctx->refs)) { | |
9588 | __io_uring_show_fdinfo(ctx, m); | |
9589 | percpu_ref_put(&ctx->refs); | |
9590 | } | |
9591 | } | |
bebdb65e | 9592 | #endif |
87ce955b | 9593 | |
2b188cc1 JA |
9594 | static const struct file_operations io_uring_fops = { |
9595 | .release = io_uring_release, | |
fcb323cc | 9596 | .flush = io_uring_flush, |
2b188cc1 | 9597 | .mmap = io_uring_mmap, |
6c5c240e RP |
9598 | #ifndef CONFIG_MMU |
9599 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9600 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9601 | #endif | |
2b188cc1 JA |
9602 | .poll = io_uring_poll, |
9603 | .fasync = io_uring_fasync, | |
bebdb65e | 9604 | #ifdef CONFIG_PROC_FS |
87ce955b | 9605 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9606 | #endif |
2b188cc1 JA |
9607 | }; |
9608 | ||
9609 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9610 | struct io_uring_params *p) | |
9611 | { | |
75b28aff HV |
9612 | struct io_rings *rings; |
9613 | size_t size, sq_array_offset; | |
2b188cc1 | 9614 | |
bd740481 JA |
9615 | /* make sure these are sane, as we already accounted them */ |
9616 | ctx->sq_entries = p->sq_entries; | |
9617 | ctx->cq_entries = p->cq_entries; | |
9618 | ||
75b28aff HV |
9619 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9620 | if (size == SIZE_MAX) | |
9621 | return -EOVERFLOW; | |
9622 | ||
9623 | rings = io_mem_alloc(size); | |
9624 | if (!rings) | |
2b188cc1 JA |
9625 | return -ENOMEM; |
9626 | ||
75b28aff HV |
9627 | ctx->rings = rings; |
9628 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9629 | rings->sq_ring_mask = p->sq_entries - 1; | |
9630 | rings->cq_ring_mask = p->cq_entries - 1; | |
9631 | rings->sq_ring_entries = p->sq_entries; | |
9632 | rings->cq_ring_entries = p->cq_entries; | |
9633 | ctx->sq_mask = rings->sq_ring_mask; | |
9634 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9635 | |
9636 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9637 | if (size == SIZE_MAX) { |
9638 | io_mem_free(ctx->rings); | |
9639 | ctx->rings = NULL; | |
2b188cc1 | 9640 | return -EOVERFLOW; |
eb065d30 | 9641 | } |
2b188cc1 JA |
9642 | |
9643 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9644 | if (!ctx->sq_sqes) { |
9645 | io_mem_free(ctx->rings); | |
9646 | ctx->rings = NULL; | |
2b188cc1 | 9647 | return -ENOMEM; |
eb065d30 | 9648 | } |
2b188cc1 | 9649 | |
2b188cc1 JA |
9650 | return 0; |
9651 | } | |
9652 | ||
9faadcc8 PB |
9653 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9654 | { | |
9655 | int ret, fd; | |
9656 | ||
9657 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9658 | if (fd < 0) | |
9659 | return fd; | |
9660 | ||
9661 | ret = io_uring_add_task_file(ctx, file); | |
9662 | if (ret) { | |
9663 | put_unused_fd(fd); | |
9664 | return ret; | |
9665 | } | |
9666 | fd_install(fd, file); | |
9667 | return fd; | |
9668 | } | |
9669 | ||
2b188cc1 JA |
9670 | /* |
9671 | * Allocate an anonymous fd, this is what constitutes the application | |
9672 | * visible backing of an io_uring instance. The application mmaps this | |
9673 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9674 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9675 | */ | |
9faadcc8 | 9676 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9677 | { |
9678 | struct file *file; | |
9faadcc8 | 9679 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9680 | int ret; |
9681 | ||
2b188cc1 JA |
9682 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9683 | &ctx->ring_sock); | |
9684 | if (ret) | |
9faadcc8 | 9685 | return ERR_PTR(ret); |
2b188cc1 JA |
9686 | #endif |
9687 | ||
2b188cc1 JA |
9688 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9689 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9690 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9691 | if (IS_ERR(file)) { |
9692 | sock_release(ctx->ring_sock); | |
9693 | ctx->ring_sock = NULL; | |
9694 | } else { | |
9695 | ctx->ring_sock->file = file; | |
0f212204 | 9696 | } |
2b188cc1 | 9697 | #endif |
9faadcc8 | 9698 | return file; |
2b188cc1 JA |
9699 | } |
9700 | ||
7f13657d XW |
9701 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9702 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9703 | { |
9704 | struct user_struct *user = NULL; | |
9705 | struct io_ring_ctx *ctx; | |
9faadcc8 | 9706 | struct file *file; |
2b188cc1 JA |
9707 | int ret; |
9708 | ||
8110c1a6 | 9709 | if (!entries) |
2b188cc1 | 9710 | return -EINVAL; |
8110c1a6 JA |
9711 | if (entries > IORING_MAX_ENTRIES) { |
9712 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9713 | return -EINVAL; | |
9714 | entries = IORING_MAX_ENTRIES; | |
9715 | } | |
2b188cc1 JA |
9716 | |
9717 | /* | |
9718 | * Use twice as many entries for the CQ ring. It's possible for the | |
9719 | * application to drive a higher depth than the size of the SQ ring, | |
9720 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9721 | * some flexibility in overcommitting a bit. If the application has |
9722 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9723 | * of CQ ring entries manually. | |
2b188cc1 JA |
9724 | */ |
9725 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9726 | if (p->flags & IORING_SETUP_CQSIZE) { |
9727 | /* | |
9728 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9729 | * to a power-of-two, if it isn't already. We do NOT impose | |
9730 | * any cq vs sq ring sizing. | |
9731 | */ | |
eb2667b3 | 9732 | if (!p->cq_entries) |
33a107f0 | 9733 | return -EINVAL; |
8110c1a6 JA |
9734 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9735 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9736 | return -EINVAL; | |
9737 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9738 | } | |
eb2667b3 JQ |
9739 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9740 | if (p->cq_entries < p->sq_entries) | |
9741 | return -EINVAL; | |
33a107f0 JA |
9742 | } else { |
9743 | p->cq_entries = 2 * p->sq_entries; | |
9744 | } | |
2b188cc1 JA |
9745 | |
9746 | user = get_uid(current_user()); | |
2b188cc1 JA |
9747 | |
9748 | ctx = io_ring_ctx_alloc(p); | |
9749 | if (!ctx) { | |
2b188cc1 JA |
9750 | free_uid(user); |
9751 | return -ENOMEM; | |
9752 | } | |
9753 | ctx->compat = in_compat_syscall(); | |
26bfa89e | 9754 | ctx->limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9755 | ctx->user = user; |
0b8c0ec7 | 9756 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9757 | #ifdef CONFIG_AUDIT |
9758 | ctx->loginuid = current->loginuid; | |
9759 | ctx->sessionid = current->sessionid; | |
9760 | #endif | |
2aede0e4 JA |
9761 | ctx->sqo_task = get_task_struct(current); |
9762 | ||
9763 | /* | |
9764 | * This is just grabbed for accounting purposes. When a process exits, | |
9765 | * the mm is exited and dropped before the files, hence we need to hang | |
9766 | * on to this mm purely for the purposes of being able to unaccount | |
9767 | * memory (locked/pinned vm). It's not used for anything else. | |
9768 | */ | |
6b7898eb | 9769 | mmgrab(current->mm); |
2aede0e4 | 9770 | ctx->mm_account = current->mm; |
6b7898eb | 9771 | |
91d8f519 DZ |
9772 | #ifdef CONFIG_BLK_CGROUP |
9773 | /* | |
9774 | * The sq thread will belong to the original cgroup it was inited in. | |
9775 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9776 | * issued bios will be associated with the closest cgroup later in the | |
9777 | * block layer. | |
9778 | */ | |
9779 | rcu_read_lock(); | |
9780 | ctx->sqo_blkcg_css = blkcg_css(); | |
9781 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9782 | rcu_read_unlock(); | |
9783 | if (!ret) { | |
9784 | /* don't init against a dying cgroup, have the user try again */ | |
9785 | ctx->sqo_blkcg_css = NULL; | |
9786 | ret = -ENODEV; | |
9787 | goto err; | |
9788 | } | |
9789 | #endif | |
2b188cc1 JA |
9790 | ret = io_allocate_scq_urings(ctx, p); |
9791 | if (ret) | |
9792 | goto err; | |
9793 | ||
7e84e1c7 | 9794 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9795 | if (ret) |
9796 | goto err; | |
9797 | ||
7e84e1c7 SG |
9798 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9799 | io_sq_offload_start(ctx); | |
9800 | ||
2b188cc1 | 9801 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9802 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9803 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9804 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9805 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9806 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9807 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9808 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9809 | |
9810 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9811 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9812 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9813 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9814 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9815 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9816 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9817 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9818 | |
7f13657d XW |
9819 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9820 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9821 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9822 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9823 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9824 | |
9825 | if (copy_to_user(params, p, sizeof(*p))) { | |
9826 | ret = -EFAULT; | |
9827 | goto err; | |
9828 | } | |
d1719f70 | 9829 | |
9faadcc8 PB |
9830 | file = io_uring_get_file(ctx); |
9831 | if (IS_ERR(file)) { | |
9832 | ret = PTR_ERR(file); | |
9833 | goto err; | |
9834 | } | |
9835 | ||
044c1ab3 JA |
9836 | /* |
9837 | * Install ring fd as the very last thing, so we don't risk someone | |
9838 | * having closed it before we finish setup | |
9839 | */ | |
9faadcc8 PB |
9840 | ret = io_uring_install_fd(ctx, file); |
9841 | if (ret < 0) { | |
06585c49 | 9842 | io_disable_sqo_submit(ctx); |
9faadcc8 PB |
9843 | /* fput will clean it up */ |
9844 | fput(file); | |
9845 | return ret; | |
9846 | } | |
044c1ab3 | 9847 | |
c826bd7a | 9848 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9849 | return ret; |
9850 | err: | |
d9d05217 | 9851 | io_disable_sqo_submit(ctx); |
2b188cc1 JA |
9852 | io_ring_ctx_wait_and_kill(ctx); |
9853 | return ret; | |
9854 | } | |
9855 | ||
9856 | /* | |
9857 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9858 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9859 | * params structure passed in. | |
9860 | */ | |
9861 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9862 | { | |
9863 | struct io_uring_params p; | |
2b188cc1 JA |
9864 | int i; |
9865 | ||
9866 | if (copy_from_user(&p, params, sizeof(p))) | |
9867 | return -EFAULT; | |
9868 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9869 | if (p.resv[i]) | |
9870 | return -EINVAL; | |
9871 | } | |
9872 | ||
6c271ce2 | 9873 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9874 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9875 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9876 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9877 | return -EINVAL; |
9878 | ||
7f13657d | 9879 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9880 | } |
9881 | ||
9882 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9883 | struct io_uring_params __user *, params) | |
9884 | { | |
9885 | return io_uring_setup(entries, params); | |
9886 | } | |
9887 | ||
66f4af93 JA |
9888 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9889 | { | |
9890 | struct io_uring_probe *p; | |
9891 | size_t size; | |
9892 | int i, ret; | |
9893 | ||
9894 | size = struct_size(p, ops, nr_args); | |
9895 | if (size == SIZE_MAX) | |
9896 | return -EOVERFLOW; | |
9897 | p = kzalloc(size, GFP_KERNEL); | |
9898 | if (!p) | |
9899 | return -ENOMEM; | |
9900 | ||
9901 | ret = -EFAULT; | |
9902 | if (copy_from_user(p, arg, size)) | |
9903 | goto out; | |
9904 | ret = -EINVAL; | |
9905 | if (memchr_inv(p, 0, size)) | |
9906 | goto out; | |
9907 | ||
9908 | p->last_op = IORING_OP_LAST - 1; | |
9909 | if (nr_args > IORING_OP_LAST) | |
9910 | nr_args = IORING_OP_LAST; | |
9911 | ||
9912 | for (i = 0; i < nr_args; i++) { | |
9913 | p->ops[i].op = i; | |
9914 | if (!io_op_defs[i].not_supported) | |
9915 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9916 | } | |
9917 | p->ops_len = i; | |
9918 | ||
9919 | ret = 0; | |
9920 | if (copy_to_user(arg, p, size)) | |
9921 | ret = -EFAULT; | |
9922 | out: | |
9923 | kfree(p); | |
9924 | return ret; | |
9925 | } | |
9926 | ||
071698e1 JA |
9927 | static int io_register_personality(struct io_ring_ctx *ctx) |
9928 | { | |
1e6fa521 JA |
9929 | struct io_identity *id; |
9930 | int ret; | |
071698e1 | 9931 | |
1e6fa521 JA |
9932 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9933 | if (unlikely(!id)) | |
9934 | return -ENOMEM; | |
9935 | ||
9936 | io_init_identity(id); | |
9937 | id->creds = get_current_cred(); | |
9938 | ||
9939 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9940 | if (ret < 0) { | |
9941 | put_cred(id->creds); | |
9942 | kfree(id); | |
9943 | } | |
9944 | return ret; | |
071698e1 JA |
9945 | } |
9946 | ||
21b55dbc SG |
9947 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9948 | unsigned int nr_args) | |
9949 | { | |
9950 | struct io_uring_restriction *res; | |
9951 | size_t size; | |
9952 | int i, ret; | |
9953 | ||
7e84e1c7 SG |
9954 | /* Restrictions allowed only if rings started disabled */ |
9955 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9956 | return -EBADFD; | |
9957 | ||
21b55dbc | 9958 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9959 | if (ctx->restrictions.registered) |
21b55dbc SG |
9960 | return -EBUSY; |
9961 | ||
9962 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9963 | return -EINVAL; | |
9964 | ||
9965 | size = array_size(nr_args, sizeof(*res)); | |
9966 | if (size == SIZE_MAX) | |
9967 | return -EOVERFLOW; | |
9968 | ||
9969 | res = memdup_user(arg, size); | |
9970 | if (IS_ERR(res)) | |
9971 | return PTR_ERR(res); | |
9972 | ||
9973 | ret = 0; | |
9974 | ||
9975 | for (i = 0; i < nr_args; i++) { | |
9976 | switch (res[i].opcode) { | |
9977 | case IORING_RESTRICTION_REGISTER_OP: | |
9978 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9979 | ret = -EINVAL; | |
9980 | goto out; | |
9981 | } | |
9982 | ||
9983 | __set_bit(res[i].register_op, | |
9984 | ctx->restrictions.register_op); | |
9985 | break; | |
9986 | case IORING_RESTRICTION_SQE_OP: | |
9987 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9988 | ret = -EINVAL; | |
9989 | goto out; | |
9990 | } | |
9991 | ||
9992 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9993 | break; | |
9994 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9995 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9996 | break; | |
9997 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9998 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9999 | break; | |
10000 | default: | |
10001 | ret = -EINVAL; | |
10002 | goto out; | |
10003 | } | |
10004 | } | |
10005 | ||
10006 | out: | |
10007 | /* Reset all restrictions if an error happened */ | |
10008 | if (ret != 0) | |
10009 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10010 | else | |
7e84e1c7 | 10011 | ctx->restrictions.registered = true; |
21b55dbc SG |
10012 | |
10013 | kfree(res); | |
10014 | return ret; | |
10015 | } | |
10016 | ||
7e84e1c7 SG |
10017 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10018 | { | |
10019 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10020 | return -EBADFD; | |
10021 | ||
10022 | if (ctx->restrictions.registered) | |
10023 | ctx->restricted = 1; | |
10024 | ||
10025 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
10026 | ||
10027 | io_sq_offload_start(ctx); | |
10028 | ||
10029 | return 0; | |
10030 | } | |
10031 | ||
071698e1 JA |
10032 | static bool io_register_op_must_quiesce(int op) |
10033 | { | |
10034 | switch (op) { | |
10035 | case IORING_UNREGISTER_FILES: | |
10036 | case IORING_REGISTER_FILES_UPDATE: | |
10037 | case IORING_REGISTER_PROBE: | |
10038 | case IORING_REGISTER_PERSONALITY: | |
10039 | case IORING_UNREGISTER_PERSONALITY: | |
10040 | return false; | |
10041 | default: | |
10042 | return true; | |
10043 | } | |
10044 | } | |
10045 | ||
edafccee JA |
10046 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10047 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10048 | __releases(ctx->uring_lock) |
10049 | __acquires(ctx->uring_lock) | |
edafccee JA |
10050 | { |
10051 | int ret; | |
10052 | ||
35fa71a0 JA |
10053 | /* |
10054 | * We're inside the ring mutex, if the ref is already dying, then | |
10055 | * someone else killed the ctx or is already going through | |
10056 | * io_uring_register(). | |
10057 | */ | |
10058 | if (percpu_ref_is_dying(&ctx->refs)) | |
10059 | return -ENXIO; | |
10060 | ||
071698e1 | 10061 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10062 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 10063 | |
05f3fb3c JA |
10064 | /* |
10065 | * Drop uring mutex before waiting for references to exit. If | |
10066 | * another thread is currently inside io_uring_enter() it might | |
10067 | * need to grab the uring_lock to make progress. If we hold it | |
10068 | * here across the drain wait, then we can deadlock. It's safe | |
10069 | * to drop the mutex here, since no new references will come in | |
10070 | * after we've killed the percpu ref. | |
10071 | */ | |
10072 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
10073 | do { |
10074 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10075 | if (!ret) | |
10076 | break; | |
ed6930c9 JA |
10077 | ret = io_run_task_work_sig(); |
10078 | if (ret < 0) | |
10079 | break; | |
af9c1a44 JA |
10080 | } while (1); |
10081 | ||
05f3fb3c | 10082 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 10083 | |
c150368b JA |
10084 | if (ret) { |
10085 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
10086 | goto out_quiesce; |
10087 | } | |
10088 | } | |
10089 | ||
10090 | if (ctx->restricted) { | |
10091 | if (opcode >= IORING_REGISTER_LAST) { | |
10092 | ret = -EINVAL; | |
10093 | goto out; | |
10094 | } | |
10095 | ||
10096 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
10097 | ret = -EACCES; | |
c150368b JA |
10098 | goto out; |
10099 | } | |
05f3fb3c | 10100 | } |
edafccee JA |
10101 | |
10102 | switch (opcode) { | |
10103 | case IORING_REGISTER_BUFFERS: | |
0a96bbe4 | 10104 | ret = io_sqe_buffers_register(ctx, arg, nr_args); |
edafccee JA |
10105 | break; |
10106 | case IORING_UNREGISTER_BUFFERS: | |
10107 | ret = -EINVAL; | |
10108 | if (arg || nr_args) | |
10109 | break; | |
0a96bbe4 | 10110 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10111 | break; |
6b06314c JA |
10112 | case IORING_REGISTER_FILES: |
10113 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
10114 | break; | |
10115 | case IORING_UNREGISTER_FILES: | |
10116 | ret = -EINVAL; | |
10117 | if (arg || nr_args) | |
10118 | break; | |
10119 | ret = io_sqe_files_unregister(ctx); | |
10120 | break; | |
c3a31e60 JA |
10121 | case IORING_REGISTER_FILES_UPDATE: |
10122 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
10123 | break; | |
9b402849 | 10124 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10125 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10126 | ret = -EINVAL; |
10127 | if (nr_args != 1) | |
10128 | break; | |
10129 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10130 | if (ret) |
10131 | break; | |
10132 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10133 | ctx->eventfd_async = 1; | |
10134 | else | |
10135 | ctx->eventfd_async = 0; | |
9b402849 JA |
10136 | break; |
10137 | case IORING_UNREGISTER_EVENTFD: | |
10138 | ret = -EINVAL; | |
10139 | if (arg || nr_args) | |
10140 | break; | |
10141 | ret = io_eventfd_unregister(ctx); | |
10142 | break; | |
66f4af93 JA |
10143 | case IORING_REGISTER_PROBE: |
10144 | ret = -EINVAL; | |
10145 | if (!arg || nr_args > 256) | |
10146 | break; | |
10147 | ret = io_probe(ctx, arg, nr_args); | |
10148 | break; | |
071698e1 JA |
10149 | case IORING_REGISTER_PERSONALITY: |
10150 | ret = -EINVAL; | |
10151 | if (arg || nr_args) | |
10152 | break; | |
10153 | ret = io_register_personality(ctx); | |
10154 | break; | |
10155 | case IORING_UNREGISTER_PERSONALITY: | |
10156 | ret = -EINVAL; | |
10157 | if (arg) | |
10158 | break; | |
10159 | ret = io_unregister_personality(ctx, nr_args); | |
10160 | break; | |
7e84e1c7 SG |
10161 | case IORING_REGISTER_ENABLE_RINGS: |
10162 | ret = -EINVAL; | |
10163 | if (arg || nr_args) | |
10164 | break; | |
10165 | ret = io_register_enable_rings(ctx); | |
10166 | break; | |
21b55dbc SG |
10167 | case IORING_REGISTER_RESTRICTIONS: |
10168 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10169 | break; | |
edafccee JA |
10170 | default: |
10171 | ret = -EINVAL; | |
10172 | break; | |
10173 | } | |
10174 | ||
21b55dbc | 10175 | out: |
071698e1 | 10176 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10177 | /* bring the ctx back to life */ |
05f3fb3c | 10178 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 10179 | out_quiesce: |
0f158b4c | 10180 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10181 | } |
edafccee JA |
10182 | return ret; |
10183 | } | |
10184 | ||
10185 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10186 | void __user *, arg, unsigned int, nr_args) | |
10187 | { | |
10188 | struct io_ring_ctx *ctx; | |
10189 | long ret = -EBADF; | |
10190 | struct fd f; | |
10191 | ||
10192 | f = fdget(fd); | |
10193 | if (!f.file) | |
10194 | return -EBADF; | |
10195 | ||
10196 | ret = -EOPNOTSUPP; | |
10197 | if (f.file->f_op != &io_uring_fops) | |
10198 | goto out_fput; | |
10199 | ||
10200 | ctx = f.file->private_data; | |
10201 | ||
10202 | mutex_lock(&ctx->uring_lock); | |
10203 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10204 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10205 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10206 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10207 | out_fput: |
10208 | fdput(f); | |
10209 | return ret; | |
10210 | } | |
10211 | ||
2b188cc1 JA |
10212 | static int __init io_uring_init(void) |
10213 | { | |
d7f62e82 SM |
10214 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10215 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10216 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10217 | } while (0) | |
10218 | ||
10219 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10220 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10221 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10222 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10223 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10224 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10225 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10226 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10227 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10228 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10229 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10230 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10231 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10232 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10233 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10234 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10235 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10236 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10237 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10238 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10239 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10240 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10241 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10242 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10243 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10244 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10245 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10246 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10247 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
10248 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 10249 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10250 | |
d3656344 | 10251 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10252 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
91f245d5 JA |
10253 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10254 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10255 | return 0; |
10256 | }; | |
10257 | __initcall(io_uring_init); |