Commit | Line | Data |
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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> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
93 | |
94 | /* | |
95 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
96 | */ | |
97 | #define IORING_FILE_TABLE_SHIFT 9 | |
98 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
99 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
100 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
2b188cc1 JA |
101 | |
102 | struct io_uring { | |
103 | u32 head ____cacheline_aligned_in_smp; | |
104 | u32 tail ____cacheline_aligned_in_smp; | |
105 | }; | |
106 | ||
1e84b97b | 107 | /* |
75b28aff HV |
108 | * This data is shared with the application through the mmap at offsets |
109 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
110 | * |
111 | * The offsets to the member fields are published through struct | |
112 | * io_sqring_offsets when calling io_uring_setup. | |
113 | */ | |
75b28aff | 114 | struct io_rings { |
1e84b97b SB |
115 | /* |
116 | * Head and tail offsets into the ring; the offsets need to be | |
117 | * masked to get valid indices. | |
118 | * | |
75b28aff HV |
119 | * The kernel controls head of the sq ring and the tail of the cq ring, |
120 | * and the application controls tail of the sq ring and the head of the | |
121 | * cq ring. | |
1e84b97b | 122 | */ |
75b28aff | 123 | struct io_uring sq, cq; |
1e84b97b | 124 | /* |
75b28aff | 125 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
126 | * ring_entries - 1) |
127 | */ | |
75b28aff HV |
128 | u32 sq_ring_mask, cq_ring_mask; |
129 | /* Ring sizes (constant, power of 2) */ | |
130 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
131 | /* |
132 | * Number of invalid entries dropped by the kernel due to | |
133 | * invalid index stored in array | |
134 | * | |
135 | * Written by the kernel, shouldn't be modified by the | |
136 | * application (i.e. get number of "new events" by comparing to | |
137 | * cached value). | |
138 | * | |
139 | * After a new SQ head value was read by the application this | |
140 | * counter includes all submissions that were dropped reaching | |
141 | * the new SQ head (and possibly more). | |
142 | */ | |
75b28aff | 143 | u32 sq_dropped; |
1e84b97b | 144 | /* |
0d9b5b3a | 145 | * Runtime SQ flags |
1e84b97b SB |
146 | * |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application. | |
149 | * | |
150 | * The application needs a full memory barrier before checking | |
151 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
152 | */ | |
75b28aff | 153 | u32 sq_flags; |
0d9b5b3a SG |
154 | /* |
155 | * Runtime CQ flags | |
156 | * | |
157 | * Written by the application, shouldn't be modified by the | |
158 | * kernel. | |
159 | */ | |
160 | u32 cq_flags; | |
1e84b97b SB |
161 | /* |
162 | * Number of completion events lost because the queue was full; | |
163 | * this should be avoided by the application by making sure | |
0b4295b5 | 164 | * there are not more requests pending than there is space in |
1e84b97b SB |
165 | * the completion queue. |
166 | * | |
167 | * Written by the kernel, shouldn't be modified by the | |
168 | * application (i.e. get number of "new events" by comparing to | |
169 | * cached value). | |
170 | * | |
171 | * As completion events come in out of order this counter is not | |
172 | * ordered with any other data. | |
173 | */ | |
75b28aff | 174 | u32 cq_overflow; |
1e84b97b SB |
175 | /* |
176 | * Ring buffer of completion events. | |
177 | * | |
178 | * The kernel writes completion events fresh every time they are | |
179 | * produced, so the application is allowed to modify pending | |
180 | * entries. | |
181 | */ | |
75b28aff | 182 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
183 | }; |
184 | ||
edafccee JA |
185 | struct io_mapped_ubuf { |
186 | u64 ubuf; | |
187 | size_t len; | |
188 | struct bio_vec *bvec; | |
189 | unsigned int nr_bvecs; | |
190 | }; | |
191 | ||
65e19f54 JA |
192 | struct fixed_file_table { |
193 | struct file **files; | |
31b51510 JA |
194 | }; |
195 | ||
05589553 XW |
196 | struct fixed_file_ref_node { |
197 | struct percpu_ref refs; | |
198 | struct list_head node; | |
199 | struct list_head file_list; | |
200 | struct fixed_file_data *file_data; | |
4a38aed2 | 201 | struct llist_node llist; |
05589553 XW |
202 | }; |
203 | ||
05f3fb3c JA |
204 | struct fixed_file_data { |
205 | struct fixed_file_table *table; | |
206 | struct io_ring_ctx *ctx; | |
207 | ||
05589553 | 208 | struct percpu_ref *cur_refs; |
05f3fb3c | 209 | struct percpu_ref refs; |
05f3fb3c | 210 | struct completion done; |
05589553 XW |
211 | struct list_head ref_list; |
212 | spinlock_t lock; | |
05f3fb3c JA |
213 | }; |
214 | ||
5a2e745d JA |
215 | struct io_buffer { |
216 | struct list_head list; | |
217 | __u64 addr; | |
218 | __s32 len; | |
219 | __u16 bid; | |
220 | }; | |
221 | ||
2b188cc1 JA |
222 | struct io_ring_ctx { |
223 | struct { | |
224 | struct percpu_ref refs; | |
225 | } ____cacheline_aligned_in_smp; | |
226 | ||
227 | struct { | |
228 | unsigned int flags; | |
e1d85334 | 229 | unsigned int compat: 1; |
aad5d8da | 230 | unsigned int limit_mem: 1; |
e1d85334 RD |
231 | unsigned int cq_overflow_flushed: 1; |
232 | unsigned int drain_next: 1; | |
233 | unsigned int eventfd_async: 1; | |
2b188cc1 | 234 | |
75b28aff HV |
235 | /* |
236 | * Ring buffer of indices into array of io_uring_sqe, which is | |
237 | * mmapped by the application using the IORING_OFF_SQES offset. | |
238 | * | |
239 | * This indirection could e.g. be used to assign fixed | |
240 | * io_uring_sqe entries to operations and only submit them to | |
241 | * the queue when needed. | |
242 | * | |
243 | * The kernel modifies neither the indices array nor the entries | |
244 | * array. | |
245 | */ | |
246 | u32 *sq_array; | |
2b188cc1 JA |
247 | unsigned cached_sq_head; |
248 | unsigned sq_entries; | |
249 | unsigned sq_mask; | |
6c271ce2 | 250 | unsigned sq_thread_idle; |
498ccd9e | 251 | unsigned cached_sq_dropped; |
206aefde | 252 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 253 | unsigned long sq_check_overflow; |
de0617e4 JA |
254 | |
255 | struct list_head defer_list; | |
5262f567 | 256 | struct list_head timeout_list; |
1d7bb1d5 | 257 | struct list_head cq_overflow_list; |
fcb323cc JA |
258 | |
259 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 260 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
261 | } ____cacheline_aligned_in_smp; |
262 | ||
206aefde JA |
263 | struct io_rings *rings; |
264 | ||
2b188cc1 | 265 | /* IO offload */ |
561fb04a | 266 | struct io_wq *io_wq; |
6c271ce2 | 267 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2b188cc1 | 268 | struct mm_struct *sqo_mm; |
6c271ce2 | 269 | wait_queue_head_t sqo_wait; |
75b28aff | 270 | |
6b06314c JA |
271 | /* |
272 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
273 | * readers must ensure that ->refs is alive as long as the file* is | |
274 | * used. Only updated through io_uring_register(2). | |
275 | */ | |
05f3fb3c | 276 | struct fixed_file_data *file_data; |
6b06314c | 277 | unsigned nr_user_files; |
b14cca0c PB |
278 | int ring_fd; |
279 | struct file *ring_file; | |
6b06314c | 280 | |
edafccee JA |
281 | /* if used, fixed mapped user buffers */ |
282 | unsigned nr_user_bufs; | |
283 | struct io_mapped_ubuf *user_bufs; | |
284 | ||
2b188cc1 JA |
285 | struct user_struct *user; |
286 | ||
0b8c0ec7 | 287 | const struct cred *creds; |
181e448d | 288 | |
0f158b4c JA |
289 | struct completion ref_comp; |
290 | struct completion sq_thread_comp; | |
206aefde | 291 | |
0ddf92e8 JA |
292 | /* if all else fails... */ |
293 | struct io_kiocb *fallback_req; | |
294 | ||
206aefde JA |
295 | #if defined(CONFIG_UNIX) |
296 | struct socket *ring_sock; | |
297 | #endif | |
298 | ||
5a2e745d JA |
299 | struct idr io_buffer_idr; |
300 | ||
071698e1 JA |
301 | struct idr personality_idr; |
302 | ||
206aefde JA |
303 | struct { |
304 | unsigned cached_cq_tail; | |
305 | unsigned cq_entries; | |
306 | unsigned cq_mask; | |
307 | atomic_t cq_timeouts; | |
ad3eb2c8 | 308 | unsigned long cq_check_overflow; |
206aefde JA |
309 | struct wait_queue_head cq_wait; |
310 | struct fasync_struct *cq_fasync; | |
311 | struct eventfd_ctx *cq_ev_fd; | |
312 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
313 | |
314 | struct { | |
315 | struct mutex uring_lock; | |
316 | wait_queue_head_t wait; | |
317 | } ____cacheline_aligned_in_smp; | |
318 | ||
319 | struct { | |
320 | spinlock_t completion_lock; | |
e94f141b | 321 | |
def596e9 | 322 | /* |
540e32a0 | 323 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
324 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
325 | * For SQPOLL, only the single threaded io_sq_thread() will | |
326 | * manipulate the list, hence no extra locking is needed there. | |
327 | */ | |
540e32a0 | 328 | struct list_head iopoll_list; |
78076bb6 JA |
329 | struct hlist_head *cancel_hash; |
330 | unsigned cancel_hash_bits; | |
e94f141b | 331 | bool poll_multi_file; |
31b51510 | 332 | |
fcb323cc JA |
333 | spinlock_t inflight_lock; |
334 | struct list_head inflight_list; | |
2b188cc1 | 335 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 336 | |
4a38aed2 JA |
337 | struct delayed_work file_put_work; |
338 | struct llist_head file_put_llist; | |
339 | ||
85faa7b8 | 340 | struct work_struct exit_work; |
2b188cc1 JA |
341 | }; |
342 | ||
09bb8394 JA |
343 | /* |
344 | * First field must be the file pointer in all the | |
345 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
346 | */ | |
221c5eb2 JA |
347 | struct io_poll_iocb { |
348 | struct file *file; | |
0969e783 JA |
349 | union { |
350 | struct wait_queue_head *head; | |
351 | u64 addr; | |
352 | }; | |
221c5eb2 | 353 | __poll_t events; |
8c838788 | 354 | bool done; |
221c5eb2 | 355 | bool canceled; |
392edb45 | 356 | struct wait_queue_entry wait; |
221c5eb2 JA |
357 | }; |
358 | ||
b5dba59e JA |
359 | struct io_close { |
360 | struct file *file; | |
361 | struct file *put_file; | |
362 | int fd; | |
363 | }; | |
364 | ||
ad8a48ac JA |
365 | struct io_timeout_data { |
366 | struct io_kiocb *req; | |
367 | struct hrtimer timer; | |
368 | struct timespec64 ts; | |
369 | enum hrtimer_mode mode; | |
370 | }; | |
371 | ||
8ed8d3c3 JA |
372 | struct io_accept { |
373 | struct file *file; | |
374 | struct sockaddr __user *addr; | |
375 | int __user *addr_len; | |
376 | int flags; | |
09952e3e | 377 | unsigned long nofile; |
8ed8d3c3 JA |
378 | }; |
379 | ||
380 | struct io_sync { | |
381 | struct file *file; | |
382 | loff_t len; | |
383 | loff_t off; | |
384 | int flags; | |
d63d1b5e | 385 | int mode; |
8ed8d3c3 JA |
386 | }; |
387 | ||
fbf23849 JA |
388 | struct io_cancel { |
389 | struct file *file; | |
390 | u64 addr; | |
391 | }; | |
392 | ||
b29472ee JA |
393 | struct io_timeout { |
394 | struct file *file; | |
395 | u64 addr; | |
396 | int flags; | |
bfe68a22 PB |
397 | u32 off; |
398 | u32 target_seq; | |
135fcde8 | 399 | struct list_head list; |
b29472ee JA |
400 | }; |
401 | ||
9adbd45d JA |
402 | struct io_rw { |
403 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
404 | struct kiocb kiocb; | |
405 | u64 addr; | |
406 | u64 len; | |
407 | }; | |
408 | ||
3fbb51c1 JA |
409 | struct io_connect { |
410 | struct file *file; | |
411 | struct sockaddr __user *addr; | |
412 | int addr_len; | |
413 | }; | |
414 | ||
e47293fd JA |
415 | struct io_sr_msg { |
416 | struct file *file; | |
fddaface | 417 | union { |
270a5940 | 418 | struct user_msghdr __user *umsg; |
fddaface JA |
419 | void __user *buf; |
420 | }; | |
e47293fd | 421 | int msg_flags; |
bcda7baa | 422 | int bgid; |
fddaface | 423 | size_t len; |
bcda7baa | 424 | struct io_buffer *kbuf; |
e47293fd JA |
425 | }; |
426 | ||
15b71abe JA |
427 | struct io_open { |
428 | struct file *file; | |
429 | int dfd; | |
15b71abe | 430 | struct filename *filename; |
c12cedf2 | 431 | struct open_how how; |
4022e7af | 432 | unsigned long nofile; |
15b71abe JA |
433 | }; |
434 | ||
05f3fb3c JA |
435 | struct io_files_update { |
436 | struct file *file; | |
437 | u64 arg; | |
438 | u32 nr_args; | |
439 | u32 offset; | |
440 | }; | |
441 | ||
4840e418 JA |
442 | struct io_fadvise { |
443 | struct file *file; | |
444 | u64 offset; | |
445 | u32 len; | |
446 | u32 advice; | |
447 | }; | |
448 | ||
c1ca757b JA |
449 | struct io_madvise { |
450 | struct file *file; | |
451 | u64 addr; | |
452 | u32 len; | |
453 | u32 advice; | |
454 | }; | |
455 | ||
3e4827b0 JA |
456 | struct io_epoll { |
457 | struct file *file; | |
458 | int epfd; | |
459 | int op; | |
460 | int fd; | |
461 | struct epoll_event event; | |
e47293fd JA |
462 | }; |
463 | ||
7d67af2c PB |
464 | struct io_splice { |
465 | struct file *file_out; | |
466 | struct file *file_in; | |
467 | loff_t off_out; | |
468 | loff_t off_in; | |
469 | u64 len; | |
470 | unsigned int flags; | |
471 | }; | |
472 | ||
ddf0322d JA |
473 | struct io_provide_buf { |
474 | struct file *file; | |
475 | __u64 addr; | |
476 | __s32 len; | |
477 | __u32 bgid; | |
478 | __u16 nbufs; | |
479 | __u16 bid; | |
480 | }; | |
481 | ||
1d9e1288 BM |
482 | struct io_statx { |
483 | struct file *file; | |
484 | int dfd; | |
485 | unsigned int mask; | |
486 | unsigned int flags; | |
e62753e4 | 487 | const char __user *filename; |
1d9e1288 BM |
488 | struct statx __user *buffer; |
489 | }; | |
490 | ||
3ca405eb PB |
491 | struct io_completion { |
492 | struct file *file; | |
493 | struct list_head list; | |
0f7e466b | 494 | int cflags; |
3ca405eb PB |
495 | }; |
496 | ||
f499a021 JA |
497 | struct io_async_connect { |
498 | struct sockaddr_storage address; | |
499 | }; | |
500 | ||
03b1230c JA |
501 | struct io_async_msghdr { |
502 | struct iovec fast_iov[UIO_FASTIOV]; | |
503 | struct iovec *iov; | |
504 | struct sockaddr __user *uaddr; | |
505 | struct msghdr msg; | |
b537916c | 506 | struct sockaddr_storage addr; |
03b1230c JA |
507 | }; |
508 | ||
f67676d1 JA |
509 | struct io_async_rw { |
510 | struct iovec fast_iov[UIO_FASTIOV]; | |
511 | struct iovec *iov; | |
512 | ssize_t nr_segs; | |
513 | ssize_t size; | |
bcf5a063 | 514 | struct wait_page_queue wpq; |
f67676d1 JA |
515 | }; |
516 | ||
1a6b74fc | 517 | struct io_async_ctx { |
f67676d1 JA |
518 | union { |
519 | struct io_async_rw rw; | |
03b1230c | 520 | struct io_async_msghdr msg; |
f499a021 | 521 | struct io_async_connect connect; |
2d28390a | 522 | struct io_timeout_data timeout; |
f67676d1 | 523 | }; |
1a6b74fc JA |
524 | }; |
525 | ||
6b47ee6e PB |
526 | enum { |
527 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
528 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
529 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
530 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
531 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 532 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 533 | |
dea3b49c | 534 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
535 | REQ_F_FAIL_LINK_BIT, |
536 | REQ_F_INFLIGHT_BIT, | |
537 | REQ_F_CUR_POS_BIT, | |
538 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 539 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 540 | REQ_F_ISREG_BIT, |
6b47ee6e | 541 | REQ_F_COMP_LOCKED_BIT, |
99bc4c38 | 542 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 543 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 544 | REQ_F_POLLED_BIT, |
bcda7baa | 545 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 546 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 547 | REQ_F_WORK_INITIALIZED_BIT, |
4dd2824d | 548 | REQ_F_TASK_PINNED_BIT, |
84557871 JA |
549 | |
550 | /* not a real bit, just to check we're not overflowing the space */ | |
551 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
552 | }; |
553 | ||
554 | enum { | |
555 | /* ctx owns file */ | |
556 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
557 | /* drain existing IO first */ | |
558 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
559 | /* linked sqes */ | |
560 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
561 | /* doesn't sever on completion < 0 */ | |
562 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
563 | /* IOSQE_ASYNC */ | |
564 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
565 | /* IOSQE_BUFFER_SELECT */ |
566 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 567 | |
dea3b49c PB |
568 | /* head of a link */ |
569 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
570 | /* fail rest of links */ |
571 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
572 | /* on inflight list */ | |
573 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
574 | /* read/write uses file position */ | |
575 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
576 | /* must not punt to workers */ | |
577 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
6b47ee6e PB |
578 | /* has linked timeout */ |
579 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
6b47ee6e PB |
580 | /* regular file */ |
581 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
6b47ee6e PB |
582 | /* completion under lock */ |
583 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
584 | /* needs cleanup */ |
585 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
586 | /* in overflow list */ |
587 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
588 | /* already went through poll handler */ |
589 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
590 | /* buffer already selected */ |
591 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
592 | /* doesn't need file table for this request */ |
593 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
594 | /* io_wq_work is initialized */ |
595 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
4dd2824d PB |
596 | /* req->task is refcounted */ |
597 | REQ_F_TASK_PINNED = BIT(REQ_F_TASK_PINNED_BIT), | |
d7718a9d JA |
598 | }; |
599 | ||
600 | struct async_poll { | |
601 | struct io_poll_iocb poll; | |
807abcb0 | 602 | struct io_poll_iocb *double_poll; |
d7718a9d | 603 | struct io_wq_work work; |
6b47ee6e PB |
604 | }; |
605 | ||
09bb8394 JA |
606 | /* |
607 | * NOTE! Each of the iocb union members has the file pointer | |
608 | * as the first entry in their struct definition. So you can | |
609 | * access the file pointer through any of the sub-structs, | |
610 | * or directly as just 'ki_filp' in this struct. | |
611 | */ | |
2b188cc1 | 612 | struct io_kiocb { |
221c5eb2 | 613 | union { |
09bb8394 | 614 | struct file *file; |
9adbd45d | 615 | struct io_rw rw; |
221c5eb2 | 616 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
617 | struct io_accept accept; |
618 | struct io_sync sync; | |
fbf23849 | 619 | struct io_cancel cancel; |
b29472ee | 620 | struct io_timeout timeout; |
3fbb51c1 | 621 | struct io_connect connect; |
e47293fd | 622 | struct io_sr_msg sr_msg; |
15b71abe | 623 | struct io_open open; |
b5dba59e | 624 | struct io_close close; |
05f3fb3c | 625 | struct io_files_update files_update; |
4840e418 | 626 | struct io_fadvise fadvise; |
c1ca757b | 627 | struct io_madvise madvise; |
3e4827b0 | 628 | struct io_epoll epoll; |
7d67af2c | 629 | struct io_splice splice; |
ddf0322d | 630 | struct io_provide_buf pbuf; |
1d9e1288 | 631 | struct io_statx statx; |
3ca405eb PB |
632 | /* use only after cleaning per-op data, see io_clean_op() */ |
633 | struct io_completion compl; | |
221c5eb2 | 634 | }; |
2b188cc1 | 635 | |
1a6b74fc | 636 | struct io_async_ctx *io; |
d625c6ee | 637 | u8 opcode; |
65a6543d XW |
638 | /* polled IO has completed */ |
639 | u8 iopoll_completed; | |
2b188cc1 | 640 | |
4f4eeba8 | 641 | u16 buf_index; |
9cf7c104 | 642 | u32 result; |
4f4eeba8 | 643 | |
2b188cc1 | 644 | struct io_ring_ctx *ctx; |
2b188cc1 | 645 | unsigned int flags; |
c16361c1 | 646 | refcount_t refs; |
3537b6a7 | 647 | struct task_struct *task; |
2b188cc1 JA |
648 | u64 user_data; |
649 | ||
d7718a9d JA |
650 | struct list_head link_list; |
651 | ||
d21ffe7e PB |
652 | /* |
653 | * 1. used with ctx->iopoll_list with reads/writes | |
654 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
655 | */ | |
fcb323cc JA |
656 | struct list_head inflight_entry; |
657 | ||
05589553 XW |
658 | struct percpu_ref *fixed_file_refs; |
659 | ||
b41e9852 JA |
660 | union { |
661 | /* | |
662 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
663 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
664 | * async armed poll handlers for regular commands. The latter | |
665 | * restore the work, if needed. | |
b41e9852 JA |
666 | */ |
667 | struct { | |
d7718a9d JA |
668 | struct hlist_node hash_node; |
669 | struct async_poll *apoll; | |
b41e9852 JA |
670 | }; |
671 | struct io_wq_work work; | |
672 | }; | |
8ef77766 | 673 | struct callback_head task_work; |
2b188cc1 JA |
674 | }; |
675 | ||
27dc8338 PB |
676 | struct io_defer_entry { |
677 | struct list_head list; | |
678 | struct io_kiocb *req; | |
9cf7c104 | 679 | u32 seq; |
27dc8338 PB |
680 | }; |
681 | ||
def596e9 | 682 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 683 | |
013538bd JA |
684 | struct io_comp_state { |
685 | unsigned int nr; | |
686 | struct list_head list; | |
687 | struct io_ring_ctx *ctx; | |
688 | }; | |
689 | ||
9a56a232 JA |
690 | struct io_submit_state { |
691 | struct blk_plug plug; | |
692 | ||
2579f913 JA |
693 | /* |
694 | * io_kiocb alloc cache | |
695 | */ | |
696 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 697 | unsigned int free_reqs; |
2579f913 | 698 | |
013538bd JA |
699 | /* |
700 | * Batch completion logic | |
701 | */ | |
702 | struct io_comp_state comp; | |
703 | ||
9a56a232 JA |
704 | /* |
705 | * File reference cache | |
706 | */ | |
707 | struct file *file; | |
708 | unsigned int fd; | |
709 | unsigned int has_refs; | |
710 | unsigned int used_refs; | |
711 | unsigned int ios_left; | |
712 | }; | |
713 | ||
d3656344 JA |
714 | struct io_op_def { |
715 | /* needs req->io allocated for deferral/async */ | |
716 | unsigned async_ctx : 1; | |
717 | /* needs current->mm setup, does mm access */ | |
718 | unsigned needs_mm : 1; | |
719 | /* needs req->file assigned */ | |
720 | unsigned needs_file : 1; | |
fd2206e4 JA |
721 | /* don't fail if file grab fails */ |
722 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
723 | /* hash wq insertion if file is a regular file */ |
724 | unsigned hash_reg_file : 1; | |
725 | /* unbound wq insertion if file is a non-regular file */ | |
726 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
727 | /* opcode is not supported by this kernel */ |
728 | unsigned not_supported : 1; | |
f86cd20c JA |
729 | /* needs file table */ |
730 | unsigned file_table : 1; | |
ff002b30 JA |
731 | /* needs ->fs */ |
732 | unsigned needs_fs : 1; | |
8a72758c JA |
733 | /* set if opcode supports polled "wait" */ |
734 | unsigned pollin : 1; | |
735 | unsigned pollout : 1; | |
bcda7baa JA |
736 | /* op supports buffer selection */ |
737 | unsigned buffer_select : 1; | |
57f1a649 | 738 | unsigned needs_fsize : 1; |
d3656344 JA |
739 | }; |
740 | ||
741 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
742 | [IORING_OP_NOP] = {}, |
743 | [IORING_OP_READV] = { | |
d3656344 JA |
744 | .async_ctx = 1, |
745 | .needs_mm = 1, | |
746 | .needs_file = 1, | |
747 | .unbound_nonreg_file = 1, | |
8a72758c | 748 | .pollin = 1, |
4d954c25 | 749 | .buffer_select = 1, |
d3656344 | 750 | }, |
0463b6c5 | 751 | [IORING_OP_WRITEV] = { |
d3656344 JA |
752 | .async_ctx = 1, |
753 | .needs_mm = 1, | |
754 | .needs_file = 1, | |
755 | .hash_reg_file = 1, | |
756 | .unbound_nonreg_file = 1, | |
8a72758c | 757 | .pollout = 1, |
57f1a649 | 758 | .needs_fsize = 1, |
d3656344 | 759 | }, |
0463b6c5 | 760 | [IORING_OP_FSYNC] = { |
d3656344 JA |
761 | .needs_file = 1, |
762 | }, | |
0463b6c5 | 763 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
764 | .needs_file = 1, |
765 | .unbound_nonreg_file = 1, | |
8a72758c | 766 | .pollin = 1, |
d3656344 | 767 | }, |
0463b6c5 | 768 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
769 | .needs_file = 1, |
770 | .hash_reg_file = 1, | |
771 | .unbound_nonreg_file = 1, | |
8a72758c | 772 | .pollout = 1, |
57f1a649 | 773 | .needs_fsize = 1, |
d3656344 | 774 | }, |
0463b6c5 | 775 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
776 | .needs_file = 1, |
777 | .unbound_nonreg_file = 1, | |
778 | }, | |
0463b6c5 PB |
779 | [IORING_OP_POLL_REMOVE] = {}, |
780 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
781 | .needs_file = 1, |
782 | }, | |
0463b6c5 | 783 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
784 | .async_ctx = 1, |
785 | .needs_mm = 1, | |
786 | .needs_file = 1, | |
787 | .unbound_nonreg_file = 1, | |
ff002b30 | 788 | .needs_fs = 1, |
8a72758c | 789 | .pollout = 1, |
d3656344 | 790 | }, |
0463b6c5 | 791 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
792 | .async_ctx = 1, |
793 | .needs_mm = 1, | |
794 | .needs_file = 1, | |
795 | .unbound_nonreg_file = 1, | |
ff002b30 | 796 | .needs_fs = 1, |
8a72758c | 797 | .pollin = 1, |
52de1fe1 | 798 | .buffer_select = 1, |
d3656344 | 799 | }, |
0463b6c5 | 800 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
801 | .async_ctx = 1, |
802 | .needs_mm = 1, | |
803 | }, | |
0463b6c5 PB |
804 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
805 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
806 | .needs_mm = 1, |
807 | .needs_file = 1, | |
808 | .unbound_nonreg_file = 1, | |
f86cd20c | 809 | .file_table = 1, |
8a72758c | 810 | .pollin = 1, |
d3656344 | 811 | }, |
0463b6c5 PB |
812 | [IORING_OP_ASYNC_CANCEL] = {}, |
813 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
814 | .async_ctx = 1, |
815 | .needs_mm = 1, | |
816 | }, | |
0463b6c5 | 817 | [IORING_OP_CONNECT] = { |
d3656344 JA |
818 | .async_ctx = 1, |
819 | .needs_mm = 1, | |
820 | .needs_file = 1, | |
821 | .unbound_nonreg_file = 1, | |
8a72758c | 822 | .pollout = 1, |
d3656344 | 823 | }, |
0463b6c5 | 824 | [IORING_OP_FALLOCATE] = { |
d3656344 | 825 | .needs_file = 1, |
57f1a649 | 826 | .needs_fsize = 1, |
d3656344 | 827 | }, |
0463b6c5 | 828 | [IORING_OP_OPENAT] = { |
f86cd20c | 829 | .file_table = 1, |
ff002b30 | 830 | .needs_fs = 1, |
d3656344 | 831 | }, |
0463b6c5 | 832 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
833 | .needs_file = 1, |
834 | .needs_file_no_error = 1, | |
f86cd20c | 835 | .file_table = 1, |
d3656344 | 836 | }, |
0463b6c5 | 837 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 838 | .needs_mm = 1, |
f86cd20c | 839 | .file_table = 1, |
d3656344 | 840 | }, |
0463b6c5 | 841 | [IORING_OP_STATX] = { |
d3656344 | 842 | .needs_mm = 1, |
ff002b30 | 843 | .needs_fs = 1, |
5b0bbee4 | 844 | .file_table = 1, |
d3656344 | 845 | }, |
0463b6c5 | 846 | [IORING_OP_READ] = { |
3a6820f2 JA |
847 | .needs_mm = 1, |
848 | .needs_file = 1, | |
849 | .unbound_nonreg_file = 1, | |
8a72758c | 850 | .pollin = 1, |
bcda7baa | 851 | .buffer_select = 1, |
3a6820f2 | 852 | }, |
0463b6c5 | 853 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
854 | .needs_mm = 1, |
855 | .needs_file = 1, | |
856 | .unbound_nonreg_file = 1, | |
8a72758c | 857 | .pollout = 1, |
57f1a649 | 858 | .needs_fsize = 1, |
3a6820f2 | 859 | }, |
0463b6c5 | 860 | [IORING_OP_FADVISE] = { |
4840e418 JA |
861 | .needs_file = 1, |
862 | }, | |
0463b6c5 | 863 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
864 | .needs_mm = 1, |
865 | }, | |
0463b6c5 | 866 | [IORING_OP_SEND] = { |
fddaface JA |
867 | .needs_mm = 1, |
868 | .needs_file = 1, | |
869 | .unbound_nonreg_file = 1, | |
8a72758c | 870 | .pollout = 1, |
fddaface | 871 | }, |
0463b6c5 | 872 | [IORING_OP_RECV] = { |
fddaface JA |
873 | .needs_mm = 1, |
874 | .needs_file = 1, | |
875 | .unbound_nonreg_file = 1, | |
8a72758c | 876 | .pollin = 1, |
bcda7baa | 877 | .buffer_select = 1, |
fddaface | 878 | }, |
0463b6c5 | 879 | [IORING_OP_OPENAT2] = { |
f86cd20c | 880 | .file_table = 1, |
ff002b30 | 881 | .needs_fs = 1, |
cebdb986 | 882 | }, |
3e4827b0 JA |
883 | [IORING_OP_EPOLL_CTL] = { |
884 | .unbound_nonreg_file = 1, | |
885 | .file_table = 1, | |
886 | }, | |
7d67af2c PB |
887 | [IORING_OP_SPLICE] = { |
888 | .needs_file = 1, | |
889 | .hash_reg_file = 1, | |
890 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
891 | }, |
892 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 893 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
894 | [IORING_OP_TEE] = { |
895 | .needs_file = 1, | |
896 | .hash_reg_file = 1, | |
897 | .unbound_nonreg_file = 1, | |
898 | }, | |
d3656344 JA |
899 | }; |
900 | ||
2e0464d4 BM |
901 | enum io_mem_account { |
902 | ACCT_LOCKED, | |
903 | ACCT_PINNED, | |
904 | }; | |
905 | ||
f3a6fa22 | 906 | static bool io_rw_reissue(struct io_kiocb *req, long res); |
78e19bbe | 907 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 908 | static void io_put_req(struct io_kiocb *req); |
c40f6379 | 909 | static void io_double_put_req(struct io_kiocb *req); |
978db57e | 910 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
911 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
912 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
913 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
914 | struct io_uring_files_update *ip, | |
915 | unsigned nr_args); | |
f86cd20c | 916 | static int io_grab_files(struct io_kiocb *req); |
2237d765 JA |
917 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
918 | struct io_comp_state *cs); | |
3ca405eb | 919 | static void __io_clean_op(struct io_kiocb *req); |
b41e9852 JA |
920 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
921 | int fd, struct file **out_file, bool fixed); | |
922 | static void __io_queue_sqe(struct io_kiocb *req, | |
f13fad7b JA |
923 | const struct io_uring_sqe *sqe, |
924 | struct io_comp_state *cs); | |
4349f30e | 925 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 926 | |
b63534c4 JA |
927 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
928 | struct iovec **iovec, struct iov_iter *iter, | |
929 | bool needs_lock); | |
930 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, | |
931 | struct iovec *iovec, struct iovec *fast_iov, | |
932 | struct iov_iter *iter); | |
933 | ||
2b188cc1 JA |
934 | static struct kmem_cache *req_cachep; |
935 | ||
936 | static const struct file_operations io_uring_fops; | |
937 | ||
938 | struct sock *io_uring_get_socket(struct file *file) | |
939 | { | |
940 | #if defined(CONFIG_UNIX) | |
941 | if (file->f_op == &io_uring_fops) { | |
942 | struct io_ring_ctx *ctx = file->private_data; | |
943 | ||
944 | return ctx->ring_sock->sk; | |
945 | } | |
946 | #endif | |
947 | return NULL; | |
948 | } | |
949 | EXPORT_SYMBOL(io_uring_get_socket); | |
950 | ||
4dd2824d PB |
951 | static void io_get_req_task(struct io_kiocb *req) |
952 | { | |
953 | if (req->flags & REQ_F_TASK_PINNED) | |
954 | return; | |
955 | get_task_struct(req->task); | |
956 | req->flags |= REQ_F_TASK_PINNED; | |
957 | } | |
958 | ||
3ca405eb PB |
959 | static inline void io_clean_op(struct io_kiocb *req) |
960 | { | |
961 | if (req->flags & REQ_F_NEED_CLEANUP) | |
962 | __io_clean_op(req); | |
963 | } | |
964 | ||
4dd2824d PB |
965 | /* not idempotent -- it doesn't clear REQ_F_TASK_PINNED */ |
966 | static void __io_put_req_task(struct io_kiocb *req) | |
967 | { | |
968 | if (req->flags & REQ_F_TASK_PINNED) | |
969 | put_task_struct(req->task); | |
970 | } | |
971 | ||
4349f30e | 972 | static void io_sq_thread_drop_mm(void) |
c40f6379 JA |
973 | { |
974 | struct mm_struct *mm = current->mm; | |
975 | ||
976 | if (mm) { | |
977 | kthread_unuse_mm(mm); | |
978 | mmput(mm); | |
979 | } | |
980 | } | |
981 | ||
982 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
983 | { | |
984 | if (!current->mm) { | |
8eb06d7e | 985 | if (unlikely(!ctx->sqo_mm || !mmget_not_zero(ctx->sqo_mm))) |
c40f6379 JA |
986 | return -EFAULT; |
987 | kthread_use_mm(ctx->sqo_mm); | |
988 | } | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, | |
994 | struct io_kiocb *req) | |
995 | { | |
996 | if (!io_op_defs[req->opcode].needs_mm) | |
997 | return 0; | |
998 | return __io_sq_thread_acquire_mm(ctx); | |
999 | } | |
1000 | ||
1001 | static inline void req_set_fail_links(struct io_kiocb *req) | |
1002 | { | |
1003 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1004 | req->flags |= REQ_F_FAIL_LINK; | |
1005 | } | |
1006 | ||
7cdaf587 XW |
1007 | /* |
1008 | * Note: must call io_req_init_async() for the first time you | |
1009 | * touch any members of io_wq_work. | |
1010 | */ | |
1011 | static inline void io_req_init_async(struct io_kiocb *req) | |
1012 | { | |
1013 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
1014 | return; | |
1015 | ||
1016 | memset(&req->work, 0, sizeof(req->work)); | |
1017 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1018 | } | |
1019 | ||
0cdaf760 PB |
1020 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1021 | { | |
1022 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1023 | } | |
1024 | ||
2b188cc1 JA |
1025 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1026 | { | |
1027 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1028 | ||
0f158b4c | 1029 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1030 | } |
1031 | ||
8eb7e2d0 PB |
1032 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1033 | { | |
1034 | return !req->timeout.off; | |
1035 | } | |
1036 | ||
2b188cc1 JA |
1037 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1038 | { | |
1039 | struct io_ring_ctx *ctx; | |
78076bb6 | 1040 | int hash_bits; |
2b188cc1 JA |
1041 | |
1042 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1043 | if (!ctx) | |
1044 | return NULL; | |
1045 | ||
0ddf92e8 JA |
1046 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1047 | if (!ctx->fallback_req) | |
1048 | goto err; | |
1049 | ||
78076bb6 JA |
1050 | /* |
1051 | * Use 5 bits less than the max cq entries, that should give us around | |
1052 | * 32 entries per hash list if totally full and uniformly spread. | |
1053 | */ | |
1054 | hash_bits = ilog2(p->cq_entries); | |
1055 | hash_bits -= 5; | |
1056 | if (hash_bits <= 0) | |
1057 | hash_bits = 1; | |
1058 | ctx->cancel_hash_bits = hash_bits; | |
1059 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1060 | GFP_KERNEL); | |
1061 | if (!ctx->cancel_hash) | |
1062 | goto err; | |
1063 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1064 | ||
21482896 | 1065 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1066 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1067 | goto err; | |
2b188cc1 JA |
1068 | |
1069 | ctx->flags = p->flags; | |
583863ed | 1070 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 1071 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1072 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1073 | init_completion(&ctx->ref_comp); |
1074 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1075 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1076 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1077 | mutex_init(&ctx->uring_lock); |
1078 | init_waitqueue_head(&ctx->wait); | |
1079 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1080 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1081 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1082 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1083 | init_waitqueue_head(&ctx->inflight_wait); |
1084 | spin_lock_init(&ctx->inflight_lock); | |
1085 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1086 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1087 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1088 | return ctx; |
206aefde | 1089 | err: |
0ddf92e8 JA |
1090 | if (ctx->fallback_req) |
1091 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1092 | kfree(ctx->cancel_hash); |
206aefde JA |
1093 | kfree(ctx); |
1094 | return NULL; | |
2b188cc1 JA |
1095 | } |
1096 | ||
9cf7c104 | 1097 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
de0617e4 | 1098 | { |
2bc9930e JA |
1099 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1100 | struct io_ring_ctx *ctx = req->ctx; | |
1101 | ||
9cf7c104 PB |
1102 | return seq != ctx->cached_cq_tail |
1103 | + atomic_read(&ctx->cached_cq_overflow); | |
2bc9930e | 1104 | } |
de0617e4 | 1105 | |
9d858b21 | 1106 | return false; |
de0617e4 JA |
1107 | } |
1108 | ||
de0617e4 | 1109 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1110 | { |
75b28aff | 1111 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1112 | |
07910158 PB |
1113 | /* order cqe stores with ring update */ |
1114 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1115 | |
07910158 PB |
1116 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1117 | wake_up_interruptible(&ctx->cq_wait); | |
1118 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1119 | } |
1120 | } | |
1121 | ||
dca9cf8b | 1122 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1123 | { |
7cdaf587 XW |
1124 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1125 | return; | |
1126 | ||
cccf0ee8 JA |
1127 | if (req->work.mm) { |
1128 | mmdrop(req->work.mm); | |
1129 | req->work.mm = NULL; | |
1130 | } | |
1131 | if (req->work.creds) { | |
1132 | put_cred(req->work.creds); | |
1133 | req->work.creds = NULL; | |
1134 | } | |
ff002b30 JA |
1135 | if (req->work.fs) { |
1136 | struct fs_struct *fs = req->work.fs; | |
1137 | ||
1138 | spin_lock(&req->work.fs->lock); | |
1139 | if (--fs->users) | |
1140 | fs = NULL; | |
1141 | spin_unlock(&req->work.fs->lock); | |
1142 | if (fs) | |
1143 | free_fs_struct(fs); | |
1144 | } | |
561fb04a JA |
1145 | } |
1146 | ||
cbdcb435 | 1147 | static void io_prep_async_work(struct io_kiocb *req) |
18d9be1a | 1148 | { |
d3656344 | 1149 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1150 | |
16d59803 PB |
1151 | io_req_init_async(req); |
1152 | ||
d3656344 JA |
1153 | if (req->flags & REQ_F_ISREG) { |
1154 | if (def->hash_reg_file) | |
8766dd51 | 1155 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1156 | } else { |
1157 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1158 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1159 | } |
dca9cf8b PB |
1160 | if (!req->work.mm && def->needs_mm) { |
1161 | mmgrab(current->mm); | |
1162 | req->work.mm = current->mm; | |
1163 | } | |
1164 | if (!req->work.creds) | |
1165 | req->work.creds = get_current_cred(); | |
1166 | if (!req->work.fs && def->needs_fs) { | |
1167 | spin_lock(¤t->fs->lock); | |
1168 | if (!current->fs->in_exec) { | |
1169 | req->work.fs = current->fs; | |
1170 | req->work.fs->users++; | |
1171 | } else { | |
1172 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1173 | } | |
1174 | spin_unlock(¤t->fs->lock); | |
1175 | } | |
57f1a649 PB |
1176 | if (def->needs_fsize) |
1177 | req->work.fsize = rlimit(RLIMIT_FSIZE); | |
1178 | else | |
1179 | req->work.fsize = RLIM_INFINITY; | |
561fb04a JA |
1180 | } |
1181 | ||
cbdcb435 | 1182 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1183 | { |
cbdcb435 | 1184 | struct io_kiocb *cur; |
94ae5e77 | 1185 | |
cbdcb435 PB |
1186 | io_prep_async_work(req); |
1187 | if (req->flags & REQ_F_LINK_HEAD) | |
1188 | list_for_each_entry(cur, &req->link_list, link_list) | |
1189 | io_prep_async_work(cur); | |
1190 | } | |
1191 | ||
1192 | static void __io_queue_async_work(struct io_kiocb *req) | |
1193 | { | |
1194 | struct io_ring_ctx *ctx = req->ctx; | |
1195 | struct io_kiocb *link = io_prep_linked_timeout(req); | |
561fb04a | 1196 | |
8766dd51 PB |
1197 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1198 | &req->work, req->flags); | |
1199 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1200 | |
1201 | if (link) | |
1202 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1203 | } |
1204 | ||
cbdcb435 PB |
1205 | static void io_queue_async_work(struct io_kiocb *req) |
1206 | { | |
1207 | /* init ->work of the whole link before punting */ | |
1208 | io_prep_async_link(req); | |
1209 | __io_queue_async_work(req); | |
1210 | } | |
1211 | ||
5262f567 JA |
1212 | static void io_kill_timeout(struct io_kiocb *req) |
1213 | { | |
1214 | int ret; | |
1215 | ||
2d28390a | 1216 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1217 | if (ret != -1) { |
1218 | atomic_inc(&req->ctx->cq_timeouts); | |
135fcde8 | 1219 | list_del_init(&req->timeout.list); |
f0e20b89 | 1220 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1221 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1222 | io_put_req(req); |
5262f567 JA |
1223 | } |
1224 | } | |
1225 | ||
1226 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1227 | { | |
1228 | struct io_kiocb *req, *tmp; | |
1229 | ||
1230 | spin_lock_irq(&ctx->completion_lock); | |
135fcde8 | 1231 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) |
5262f567 JA |
1232 | io_kill_timeout(req); |
1233 | spin_unlock_irq(&ctx->completion_lock); | |
1234 | } | |
1235 | ||
04518945 | 1236 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1237 | { |
04518945 | 1238 | do { |
27dc8338 PB |
1239 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1240 | struct io_defer_entry, list); | |
de0617e4 | 1241 | |
9cf7c104 | 1242 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1243 | break; |
27dc8338 | 1244 | list_del_init(&de->list); |
cbdcb435 | 1245 | /* punt-init is done before queueing for defer */ |
27dc8338 PB |
1246 | __io_queue_async_work(de->req); |
1247 | kfree(de); | |
04518945 PB |
1248 | } while (!list_empty(&ctx->defer_list)); |
1249 | } | |
1250 | ||
360428f8 | 1251 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1252 | { |
360428f8 PB |
1253 | while (!list_empty(&ctx->timeout_list)) { |
1254 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1255 | struct io_kiocb, timeout.list); |
de0617e4 | 1256 | |
8eb7e2d0 | 1257 | if (io_is_timeout_noseq(req)) |
360428f8 | 1258 | break; |
bfe68a22 PB |
1259 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1260 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1261 | break; |
bfe68a22 | 1262 | |
135fcde8 | 1263 | list_del_init(&req->timeout.list); |
5262f567 | 1264 | io_kill_timeout(req); |
360428f8 PB |
1265 | } |
1266 | } | |
5262f567 | 1267 | |
360428f8 PB |
1268 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1269 | { | |
1270 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1271 | __io_commit_cqring(ctx); |
1272 | ||
04518945 PB |
1273 | if (unlikely(!list_empty(&ctx->defer_list))) |
1274 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1275 | } |
1276 | ||
2b188cc1 JA |
1277 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1278 | { | |
75b28aff | 1279 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1280 | unsigned tail; |
1281 | ||
1282 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1283 | /* |
1284 | * writes to the cq entry need to come after reading head; the | |
1285 | * control dependency is enough as we're using WRITE_ONCE to | |
1286 | * fill the cq entry | |
1287 | */ | |
75b28aff | 1288 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1289 | return NULL; |
1290 | ||
1291 | ctx->cached_cq_tail++; | |
75b28aff | 1292 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1293 | } |
1294 | ||
f2842ab5 JA |
1295 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1296 | { | |
f0b493e6 JA |
1297 | if (!ctx->cq_ev_fd) |
1298 | return false; | |
7e55a19c SG |
1299 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1300 | return false; | |
f2842ab5 JA |
1301 | if (!ctx->eventfd_async) |
1302 | return true; | |
b41e9852 | 1303 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1304 | } |
1305 | ||
b41e9852 | 1306 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1307 | { |
1308 | if (waitqueue_active(&ctx->wait)) | |
1309 | wake_up(&ctx->wait); | |
1310 | if (waitqueue_active(&ctx->sqo_wait)) | |
1311 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1312 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1313 | eventfd_signal(ctx->cq_ev_fd, 1); |
1314 | } | |
1315 | ||
c4a2ed72 JA |
1316 | /* Returns true if there are no backlogged entries after the flush */ |
1317 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1318 | { |
1319 | struct io_rings *rings = ctx->rings; | |
1320 | struct io_uring_cqe *cqe; | |
1321 | struct io_kiocb *req; | |
1322 | unsigned long flags; | |
1323 | LIST_HEAD(list); | |
1324 | ||
1325 | if (!force) { | |
1326 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1327 | return true; |
1d7bb1d5 JA |
1328 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1329 | rings->cq_ring_entries)) | |
c4a2ed72 | 1330 | return false; |
1d7bb1d5 JA |
1331 | } |
1332 | ||
1333 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1334 | ||
1335 | /* if force is set, the ring is going away. always drop after that */ | |
1336 | if (force) | |
69b3e546 | 1337 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1338 | |
c4a2ed72 | 1339 | cqe = NULL; |
1d7bb1d5 JA |
1340 | while (!list_empty(&ctx->cq_overflow_list)) { |
1341 | cqe = io_get_cqring(ctx); | |
1342 | if (!cqe && !force) | |
1343 | break; | |
1344 | ||
1345 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
40d8ddd4 PB |
1346 | compl.list); |
1347 | list_move(&req->compl.list, &list); | |
2ca10259 | 1348 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1349 | if (cqe) { |
1350 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1351 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1352 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 JA |
1353 | } else { |
1354 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1355 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1360 | if (cqe) { |
1361 | clear_bit(0, &ctx->sq_check_overflow); | |
1362 | clear_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1363 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1364 | } |
1d7bb1d5 JA |
1365 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1366 | io_cqring_ev_posted(ctx); | |
1367 | ||
1368 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1369 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1370 | list_del(&req->compl.list); | |
ec9c02ad | 1371 | io_put_req(req); |
1d7bb1d5 | 1372 | } |
c4a2ed72 JA |
1373 | |
1374 | return cqe != NULL; | |
1d7bb1d5 JA |
1375 | } |
1376 | ||
bcda7baa | 1377 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1378 | { |
78e19bbe | 1379 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1380 | struct io_uring_cqe *cqe; |
1381 | ||
78e19bbe | 1382 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1383 | |
2b188cc1 JA |
1384 | /* |
1385 | * If we can't get a cq entry, userspace overflowed the | |
1386 | * submission (by quite a lot). Increment the overflow count in | |
1387 | * the ring. | |
1388 | */ | |
1389 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1390 | if (likely(cqe)) { |
78e19bbe | 1391 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1392 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1393 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1394 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1395 | WRITE_ONCE(ctx->rings->cq_overflow, |
1396 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1397 | } else { |
ad3eb2c8 JA |
1398 | if (list_empty(&ctx->cq_overflow_list)) { |
1399 | set_bit(0, &ctx->sq_check_overflow); | |
1400 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1401 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1402 | } |
40d8ddd4 | 1403 | io_clean_op(req); |
2ca10259 | 1404 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 | 1405 | req->result = res; |
0f7e466b | 1406 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1407 | refcount_inc(&req->refs); |
1408 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1409 | } |
1410 | } | |
1411 | ||
bcda7baa JA |
1412 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1413 | { | |
1414 | __io_cqring_fill_event(req, res, 0); | |
1415 | } | |
1416 | ||
e1e16097 | 1417 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1418 | { |
78e19bbe | 1419 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1420 | unsigned long flags; |
1421 | ||
1422 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1423 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1424 | io_commit_cqring(ctx); |
1425 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1426 | ||
8c838788 | 1427 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1428 | } |
1429 | ||
229a7b63 | 1430 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1431 | { |
229a7b63 JA |
1432 | struct io_ring_ctx *ctx = cs->ctx; |
1433 | ||
1434 | spin_lock_irq(&ctx->completion_lock); | |
1435 | while (!list_empty(&cs->list)) { | |
1436 | struct io_kiocb *req; | |
1437 | ||
3ca405eb PB |
1438 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1439 | list_del(&req->compl.list); | |
0f7e466b | 1440 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
229a7b63 JA |
1441 | if (!(req->flags & REQ_F_LINK_HEAD)) { |
1442 | req->flags |= REQ_F_COMP_LOCKED; | |
1443 | io_put_req(req); | |
1444 | } else { | |
1445 | spin_unlock_irq(&ctx->completion_lock); | |
1446 | io_put_req(req); | |
1447 | spin_lock_irq(&ctx->completion_lock); | |
1448 | } | |
1449 | } | |
1450 | io_commit_cqring(ctx); | |
1451 | spin_unlock_irq(&ctx->completion_lock); | |
1452 | ||
1453 | io_cqring_ev_posted(ctx); | |
1454 | cs->nr = 0; | |
1455 | } | |
1456 | ||
1457 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1458 | struct io_comp_state *cs) | |
1459 | { | |
1460 | if (!cs) { | |
1461 | io_cqring_add_event(req, res, cflags); | |
1462 | io_put_req(req); | |
1463 | } else { | |
3ca405eb | 1464 | io_clean_op(req); |
229a7b63 | 1465 | req->result = res; |
0f7e466b | 1466 | req->compl.cflags = cflags; |
3ca405eb | 1467 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1468 | if (++cs->nr >= 32) |
1469 | io_submit_flush_completions(cs); | |
1470 | } | |
e1e16097 JA |
1471 | } |
1472 | ||
1473 | static void io_req_complete(struct io_kiocb *req, long res) | |
1474 | { | |
229a7b63 | 1475 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1476 | } |
1477 | ||
0ddf92e8 JA |
1478 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1479 | { | |
1480 | return req == (struct io_kiocb *) | |
1481 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1482 | } | |
1483 | ||
1484 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1485 | { | |
1486 | struct io_kiocb *req; | |
1487 | ||
1488 | req = ctx->fallback_req; | |
dd461af6 | 1489 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1490 | return req; |
1491 | ||
1492 | return NULL; | |
1493 | } | |
1494 | ||
0553b8bd PB |
1495 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1496 | struct io_submit_state *state) | |
2b188cc1 | 1497 | { |
fd6fab2c | 1498 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1499 | struct io_kiocb *req; |
1500 | ||
f6b6c7d6 | 1501 | if (!state->free_reqs) { |
2579f913 JA |
1502 | size_t sz; |
1503 | int ret; | |
1504 | ||
1505 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1506 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1507 | ||
1508 | /* | |
1509 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1510 | * retry single alloc to be on the safe side. | |
1511 | */ | |
1512 | if (unlikely(ret <= 0)) { | |
1513 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1514 | if (!state->reqs[0]) | |
0ddf92e8 | 1515 | goto fallback; |
fd6fab2c JA |
1516 | ret = 1; |
1517 | } | |
2579f913 | 1518 | state->free_reqs = ret - 1; |
6c8a3134 | 1519 | req = state->reqs[ret - 1]; |
2579f913 | 1520 | } else { |
2579f913 | 1521 | state->free_reqs--; |
6c8a3134 | 1522 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1523 | } |
1524 | ||
2579f913 | 1525 | return req; |
0ddf92e8 | 1526 | fallback: |
0553b8bd | 1527 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1528 | } |
1529 | ||
8da11c19 PB |
1530 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1531 | bool fixed) | |
1532 | { | |
1533 | if (fixed) | |
05589553 | 1534 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1535 | else |
1536 | fput(file); | |
1537 | } | |
1538 | ||
e6543a81 | 1539 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1540 | { |
3ca405eb | 1541 | io_clean_op(req); |
929a3af9 | 1542 | |
5acbbc8e JA |
1543 | if (req->io) |
1544 | kfree(req->io); | |
8da11c19 PB |
1545 | if (req->file) |
1546 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
4dd2824d | 1547 | __io_put_req_task(req); |
dca9cf8b | 1548 | io_req_clean_work(req); |
fcb323cc | 1549 | |
fcb323cc | 1550 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1551 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1552 | unsigned long flags; |
1553 | ||
1554 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1555 | list_del(&req->inflight_entry); | |
1556 | if (waitqueue_active(&ctx->inflight_wait)) | |
1557 | wake_up(&ctx->inflight_wait); | |
1558 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1559 | } | |
e6543a81 | 1560 | } |
2b85edfc | 1561 | |
e6543a81 PB |
1562 | static void __io_free_req(struct io_kiocb *req) |
1563 | { | |
ecfc5177 PB |
1564 | struct io_ring_ctx *ctx; |
1565 | ||
e6543a81 | 1566 | io_dismantle_req(req); |
ecfc5177 | 1567 | ctx = req->ctx; |
b1e50e54 PB |
1568 | if (likely(!io_is_fallback_req(req))) |
1569 | kmem_cache_free(req_cachep, req); | |
1570 | else | |
ecfc5177 PB |
1571 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1572 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1573 | } |
1574 | ||
a197f664 | 1575 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1576 | { |
a197f664 | 1577 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1578 | int ret; |
1579 | ||
2d28390a | 1580 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1581 | if (ret != -1) { |
78e19bbe | 1582 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1583 | io_commit_cqring(ctx); |
dea3b49c | 1584 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1585 | io_put_req(req); |
2665abfd JA |
1586 | return true; |
1587 | } | |
1588 | ||
1589 | return false; | |
e65ef56d JA |
1590 | } |
1591 | ||
ab0b6451 | 1592 | static bool __io_kill_linked_timeout(struct io_kiocb *req) |
9e645e11 | 1593 | { |
7c86ffee | 1594 | struct io_kiocb *link; |
ab0b6451 | 1595 | bool wake_ev; |
7c86ffee PB |
1596 | |
1597 | if (list_empty(&req->link_list)) | |
ab0b6451 | 1598 | return false; |
7c86ffee PB |
1599 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1600 | if (link->opcode != IORING_OP_LINK_TIMEOUT) | |
ab0b6451 | 1601 | return false; |
7c86ffee PB |
1602 | |
1603 | list_del_init(&link->link_list); | |
1604 | wake_ev = io_link_cancel_timeout(link); | |
1605 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
ab0b6451 JA |
1606 | return wake_ev; |
1607 | } | |
1608 | ||
1609 | static void io_kill_linked_timeout(struct io_kiocb *req) | |
1610 | { | |
1611 | struct io_ring_ctx *ctx = req->ctx; | |
1612 | bool wake_ev; | |
1613 | ||
1614 | if (!(req->flags & REQ_F_COMP_LOCKED)) { | |
1615 | unsigned long flags; | |
1616 | ||
1617 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1618 | wake_ev = __io_kill_linked_timeout(req); | |
7c86ffee | 1619 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 JA |
1620 | } else { |
1621 | wake_ev = __io_kill_linked_timeout(req); | |
1622 | } | |
1623 | ||
7c86ffee PB |
1624 | if (wake_ev) |
1625 | io_cqring_ev_posted(ctx); | |
1626 | } | |
1627 | ||
9b5f7bd9 | 1628 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
1629 | { |
1630 | struct io_kiocb *nxt; | |
9e645e11 JA |
1631 | |
1632 | /* | |
1633 | * The list should never be empty when we are called here. But could | |
1634 | * potentially happen if the chain is messed up, check to be on the | |
1635 | * safe side. | |
1636 | */ | |
7c86ffee | 1637 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 1638 | return NULL; |
2665abfd | 1639 | |
7c86ffee PB |
1640 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1641 | list_del_init(&req->link_list); | |
1642 | if (!list_empty(&nxt->link_list)) | |
1643 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 1644 | return nxt; |
9e645e11 JA |
1645 | } |
1646 | ||
1647 | /* | |
dea3b49c | 1648 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 1649 | */ |
7c86ffee | 1650 | static void __io_fail_links(struct io_kiocb *req) |
9e645e11 | 1651 | { |
2665abfd | 1652 | struct io_ring_ctx *ctx = req->ctx; |
9e645e11 JA |
1653 | |
1654 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1655 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1656 | struct io_kiocb, link_list); | |
9e645e11 | 1657 | |
4493233e | 1658 | list_del_init(&link->link_list); |
c826bd7a | 1659 | trace_io_uring_fail_link(req, link); |
2665abfd | 1660 | |
7c86ffee PB |
1661 | io_cqring_fill_event(link, -ECANCELED); |
1662 | __io_double_put_req(link); | |
5d960724 | 1663 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1664 | } |
2665abfd JA |
1665 | |
1666 | io_commit_cqring(ctx); | |
7c86ffee PB |
1667 | io_cqring_ev_posted(ctx); |
1668 | } | |
1669 | ||
1670 | static void io_fail_links(struct io_kiocb *req) | |
1671 | { | |
1672 | struct io_ring_ctx *ctx = req->ctx; | |
1673 | ||
1674 | if (!(req->flags & REQ_F_COMP_LOCKED)) { | |
1675 | unsigned long flags; | |
1676 | ||
1677 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1678 | __io_fail_links(req); | |
1679 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1680 | } else { | |
1681 | __io_fail_links(req); | |
1682 | } | |
1683 | ||
2665abfd | 1684 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1685 | } |
1686 | ||
3fa5e0f3 | 1687 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
9e645e11 | 1688 | { |
9b0d911a | 1689 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
1690 | if (req->flags & REQ_F_LINK_TIMEOUT) |
1691 | io_kill_linked_timeout(req); | |
1692 | ||
9e645e11 JA |
1693 | /* |
1694 | * If LINK is set, we have dependent requests in this chain. If we | |
1695 | * didn't fail this request, queue the first one up, moving any other | |
1696 | * dependencies to the next request. In case of failure, fail the rest | |
1697 | * of the chain. | |
1698 | */ | |
9b5f7bd9 PB |
1699 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
1700 | return io_req_link_next(req); | |
1701 | io_fail_links(req); | |
1702 | return NULL; | |
4d7dd462 | 1703 | } |
9e645e11 | 1704 | |
3fa5e0f3 PB |
1705 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
1706 | { | |
1707 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
1708 | return NULL; | |
1709 | return __io_req_find_next(req); | |
1710 | } | |
1711 | ||
c2c4c83c JA |
1712 | static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb) |
1713 | { | |
1714 | struct task_struct *tsk = req->task; | |
1715 | struct io_ring_ctx *ctx = req->ctx; | |
1716 | int ret, notify = TWA_RESUME; | |
1717 | ||
1718 | /* | |
1719 | * SQPOLL kernel thread doesn't need notification, just a wakeup. | |
1720 | * If we're not using an eventfd, then TWA_RESUME is always fine, | |
1721 | * as we won't have dependencies between request completions for | |
1722 | * other kernel wait conditions. | |
1723 | */ | |
1724 | if (ctx->flags & IORING_SETUP_SQPOLL) | |
1725 | notify = 0; | |
1726 | else if (ctx->cq_ev_fd) | |
1727 | notify = TWA_SIGNAL; | |
1728 | ||
1729 | ret = task_work_add(tsk, cb, notify); | |
1730 | if (!ret) | |
1731 | wake_up_process(tsk); | |
1732 | return ret; | |
1733 | } | |
1734 | ||
c40f6379 JA |
1735 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
1736 | { | |
1737 | struct io_ring_ctx *ctx = req->ctx; | |
1738 | ||
1739 | spin_lock_irq(&ctx->completion_lock); | |
1740 | io_cqring_fill_event(req, error); | |
1741 | io_commit_cqring(ctx); | |
1742 | spin_unlock_irq(&ctx->completion_lock); | |
1743 | ||
1744 | io_cqring_ev_posted(ctx); | |
1745 | req_set_fail_links(req); | |
1746 | io_double_put_req(req); | |
1747 | } | |
1748 | ||
1749 | static void io_req_task_cancel(struct callback_head *cb) | |
1750 | { | |
1751 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1752 | ||
1753 | __io_req_task_cancel(req, -ECANCELED); | |
1754 | } | |
1755 | ||
1756 | static void __io_req_task_submit(struct io_kiocb *req) | |
1757 | { | |
1758 | struct io_ring_ctx *ctx = req->ctx; | |
1759 | ||
c40f6379 JA |
1760 | if (!__io_sq_thread_acquire_mm(ctx)) { |
1761 | mutex_lock(&ctx->uring_lock); | |
1762 | __io_queue_sqe(req, NULL, NULL); | |
1763 | mutex_unlock(&ctx->uring_lock); | |
1764 | } else { | |
1765 | __io_req_task_cancel(req, -EFAULT); | |
1766 | } | |
1767 | } | |
1768 | ||
1769 | static void io_req_task_submit(struct callback_head *cb) | |
1770 | { | |
1771 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1772 | ||
1773 | __io_req_task_submit(req); | |
1774 | } | |
1775 | ||
1776 | static void io_req_task_queue(struct io_kiocb *req) | |
1777 | { | |
c40f6379 JA |
1778 | int ret; |
1779 | ||
1780 | init_task_work(&req->task_work, io_req_task_submit); | |
1781 | ||
c2c4c83c | 1782 | ret = io_req_task_work_add(req, &req->task_work); |
c40f6379 | 1783 | if (unlikely(ret)) { |
c2c4c83c JA |
1784 | struct task_struct *tsk; |
1785 | ||
c40f6379 JA |
1786 | init_task_work(&req->task_work, io_req_task_cancel); |
1787 | tsk = io_wq_get_task(req->ctx->io_wq); | |
c2c4c83c JA |
1788 | task_work_add(tsk, &req->task_work, 0); |
1789 | wake_up_process(tsk); | |
c40f6379 | 1790 | } |
c40f6379 JA |
1791 | } |
1792 | ||
c3524383 | 1793 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 1794 | { |
9b5f7bd9 | 1795 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf | 1796 | |
906a8c3f PB |
1797 | if (nxt) |
1798 | io_req_task_queue(nxt); | |
c69f8dbe JL |
1799 | } |
1800 | ||
c3524383 PB |
1801 | static void io_free_req(struct io_kiocb *req) |
1802 | { | |
1803 | io_queue_next(req); | |
1804 | __io_free_req(req); | |
1805 | } | |
1806 | ||
2d6500d4 PB |
1807 | struct req_batch { |
1808 | void *reqs[IO_IOPOLL_BATCH]; | |
1809 | int to_free; | |
1810 | }; | |
1811 | ||
1812 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, | |
1813 | struct req_batch *rb) | |
1814 | { | |
1815 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1816 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
1817 | rb->to_free = 0; | |
1818 | } | |
1819 | ||
1820 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
1821 | struct req_batch *rb) | |
1822 | { | |
1823 | if (rb->to_free) | |
1824 | __io_req_free_batch_flush(ctx, rb); | |
1825 | } | |
1826 | ||
1827 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
1828 | { | |
1829 | if (unlikely(io_is_fallback_req(req))) { | |
1830 | io_free_req(req); | |
1831 | return; | |
1832 | } | |
1833 | if (req->flags & REQ_F_LINK_HEAD) | |
1834 | io_queue_next(req); | |
1835 | ||
1836 | io_dismantle_req(req); | |
1837 | rb->reqs[rb->to_free++] = req; | |
1838 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1839 | __io_req_free_batch_flush(req->ctx, rb); | |
1840 | } | |
1841 | ||
ba816ad6 JA |
1842 | /* |
1843 | * Drop reference to request, return next in chain (if there is one) if this | |
1844 | * was the last reference to this request. | |
1845 | */ | |
9b5f7bd9 | 1846 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 1847 | { |
9b5f7bd9 PB |
1848 | struct io_kiocb *nxt = NULL; |
1849 | ||
2a44f467 | 1850 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 1851 | nxt = io_req_find_next(req); |
4d7dd462 | 1852 | __io_free_req(req); |
2a44f467 | 1853 | } |
9b5f7bd9 | 1854 | return nxt; |
2b188cc1 JA |
1855 | } |
1856 | ||
e65ef56d JA |
1857 | static void io_put_req(struct io_kiocb *req) |
1858 | { | |
1859 | if (refcount_dec_and_test(&req->refs)) | |
1860 | io_free_req(req); | |
2b188cc1 JA |
1861 | } |
1862 | ||
f4db7182 | 1863 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 1864 | { |
6df1db6b | 1865 | struct io_kiocb *nxt; |
f4db7182 | 1866 | |
7a743e22 | 1867 | /* |
f4db7182 PB |
1868 | * A ref is owned by io-wq in which context we're. So, if that's the |
1869 | * last one, it's safe to steal next work. False negatives are Ok, | |
1870 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 1871 | */ |
f4db7182 PB |
1872 | if (refcount_read(&req->refs) != 1) |
1873 | return NULL; | |
7a743e22 | 1874 | |
9b5f7bd9 | 1875 | nxt = io_req_find_next(req); |
6df1db6b | 1876 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
1877 | } |
1878 | ||
978db57e JA |
1879 | /* |
1880 | * Must only be used if we don't need to care about links, usually from | |
1881 | * within the completion handling itself. | |
1882 | */ | |
1883 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1884 | { |
1885 | /* drop both submit and complete references */ | |
1886 | if (refcount_sub_and_test(2, &req->refs)) | |
1887 | __io_free_req(req); | |
1888 | } | |
1889 | ||
978db57e JA |
1890 | static void io_double_put_req(struct io_kiocb *req) |
1891 | { | |
1892 | /* drop both submit and complete references */ | |
1893 | if (refcount_sub_and_test(2, &req->refs)) | |
1894 | io_free_req(req); | |
1895 | } | |
1896 | ||
1d7bb1d5 | 1897 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1898 | { |
84f97dc2 JA |
1899 | struct io_rings *rings = ctx->rings; |
1900 | ||
ad3eb2c8 JA |
1901 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1902 | /* | |
1903 | * noflush == true is from the waitqueue handler, just ensure | |
1904 | * we wake up the task, and the next invocation will flush the | |
1905 | * entries. We cannot safely to it from here. | |
1906 | */ | |
1907 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1908 | return -1U; | |
1d7bb1d5 | 1909 | |
ad3eb2c8 JA |
1910 | io_cqring_overflow_flush(ctx, false); |
1911 | } | |
1d7bb1d5 | 1912 | |
a3a0e43f JA |
1913 | /* See comment at the top of this file */ |
1914 | smp_rmb(); | |
ad3eb2c8 | 1915 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1916 | } |
1917 | ||
fb5ccc98 PB |
1918 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1919 | { | |
1920 | struct io_rings *rings = ctx->rings; | |
1921 | ||
1922 | /* make sure SQ entry isn't read before tail */ | |
1923 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1924 | } | |
1925 | ||
bcda7baa JA |
1926 | static int io_put_kbuf(struct io_kiocb *req) |
1927 | { | |
4d954c25 | 1928 | struct io_buffer *kbuf; |
bcda7baa JA |
1929 | int cflags; |
1930 | ||
4d954c25 | 1931 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1932 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1933 | cflags |= IORING_CQE_F_BUFFER; | |
1934 | req->rw.addr = 0; | |
1935 | kfree(kbuf); | |
1936 | return cflags; | |
1937 | } | |
1938 | ||
4c6e277c JA |
1939 | static inline bool io_run_task_work(void) |
1940 | { | |
1941 | if (current->task_works) { | |
1942 | __set_current_state(TASK_RUNNING); | |
1943 | task_work_run(); | |
1944 | return true; | |
1945 | } | |
1946 | ||
1947 | return false; | |
1948 | } | |
1949 | ||
bbde017a XW |
1950 | static void io_iopoll_queue(struct list_head *again) |
1951 | { | |
1952 | struct io_kiocb *req; | |
1953 | ||
1954 | do { | |
d21ffe7e PB |
1955 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
1956 | list_del(&req->inflight_entry); | |
cf2f5425 | 1957 | if (!io_rw_reissue(req, -EAGAIN)) |
2237d765 | 1958 | io_complete_rw_common(&req->rw.kiocb, -EAGAIN, NULL); |
bbde017a XW |
1959 | } while (!list_empty(again)); |
1960 | } | |
1961 | ||
def596e9 JA |
1962 | /* |
1963 | * Find and free completed poll iocbs | |
1964 | */ | |
1965 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1966 | struct list_head *done) | |
1967 | { | |
8237e045 | 1968 | struct req_batch rb; |
def596e9 | 1969 | struct io_kiocb *req; |
bbde017a XW |
1970 | LIST_HEAD(again); |
1971 | ||
1972 | /* order with ->result store in io_complete_rw_iopoll() */ | |
1973 | smp_rmb(); | |
def596e9 | 1974 | |
2757a23e | 1975 | rb.to_free = 0; |
def596e9 | 1976 | while (!list_empty(done)) { |
bcda7baa JA |
1977 | int cflags = 0; |
1978 | ||
d21ffe7e | 1979 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a XW |
1980 | if (READ_ONCE(req->result) == -EAGAIN) { |
1981 | req->iopoll_completed = 0; | |
d21ffe7e | 1982 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
1983 | continue; |
1984 | } | |
d21ffe7e | 1985 | list_del(&req->inflight_entry); |
def596e9 | 1986 | |
bcda7baa JA |
1987 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1988 | cflags = io_put_kbuf(req); | |
1989 | ||
1990 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1991 | (*nr_events)++; |
1992 | ||
c3524383 | 1993 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 1994 | io_req_free_batch(&rb, req); |
def596e9 | 1995 | } |
def596e9 | 1996 | |
09bb8394 | 1997 | io_commit_cqring(ctx); |
32b2244a XW |
1998 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1999 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2000 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2001 | |
bbde017a XW |
2002 | if (!list_empty(&again)) |
2003 | io_iopoll_queue(&again); | |
581f9810 BM |
2004 | } |
2005 | ||
def596e9 JA |
2006 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2007 | long min) | |
2008 | { | |
2009 | struct io_kiocb *req, *tmp; | |
2010 | LIST_HEAD(done); | |
2011 | bool spin; | |
2012 | int ret; | |
2013 | ||
2014 | /* | |
2015 | * Only spin for completions if we don't have multiple devices hanging | |
2016 | * off our complete list, and we're under the requested amount. | |
2017 | */ | |
2018 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2019 | ||
2020 | ret = 0; | |
d21ffe7e | 2021 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2022 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2023 | |
2024 | /* | |
581f9810 BM |
2025 | * Move completed and retryable entries to our local lists. |
2026 | * If we find a request that requires polling, break out | |
2027 | * and complete those lists first, if we have entries there. | |
def596e9 | 2028 | */ |
65a6543d | 2029 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2030 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2031 | continue; |
2032 | } | |
2033 | if (!list_empty(&done)) | |
2034 | break; | |
2035 | ||
2036 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2037 | if (ret < 0) | |
2038 | break; | |
2039 | ||
3aadc23e PB |
2040 | /* iopoll may have completed current req */ |
2041 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2042 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2043 | |
def596e9 JA |
2044 | if (ret && spin) |
2045 | spin = false; | |
2046 | ret = 0; | |
2047 | } | |
2048 | ||
2049 | if (!list_empty(&done)) | |
2050 | io_iopoll_complete(ctx, nr_events, &done); | |
2051 | ||
2052 | return ret; | |
2053 | } | |
2054 | ||
2055 | /* | |
d195a66e | 2056 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2057 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2058 | * as a non-spinning completion check. | |
2059 | */ | |
2060 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2061 | long min) | |
2062 | { | |
540e32a0 | 2063 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2064 | int ret; |
2065 | ||
2066 | ret = io_do_iopoll(ctx, nr_events, min); | |
2067 | if (ret < 0) | |
2068 | return ret; | |
eba0a4dd | 2069 | if (*nr_events >= min) |
def596e9 JA |
2070 | return 0; |
2071 | } | |
2072 | ||
2073 | return 1; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * We can't just wait for polled events to come to us, we have to actively | |
2078 | * find and complete them. | |
2079 | */ | |
b2edc0a7 | 2080 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2081 | { |
2082 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2083 | return; | |
2084 | ||
2085 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2086 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2087 | unsigned int nr_events = 0; |
2088 | ||
b2edc0a7 | 2089 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2090 | |
b2edc0a7 PB |
2091 | /* let it sleep and repeat later if can't complete a request */ |
2092 | if (nr_events == 0) | |
2093 | break; | |
08f5439f JA |
2094 | /* |
2095 | * Ensure we allow local-to-the-cpu processing to take place, | |
2096 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2097 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2098 | */ |
3fcee5a6 PB |
2099 | if (need_resched()) { |
2100 | mutex_unlock(&ctx->uring_lock); | |
2101 | cond_resched(); | |
2102 | mutex_lock(&ctx->uring_lock); | |
2103 | } | |
def596e9 JA |
2104 | } |
2105 | mutex_unlock(&ctx->uring_lock); | |
2106 | } | |
2107 | ||
7668b92a | 2108 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2109 | { |
7668b92a | 2110 | unsigned int nr_events = 0; |
2b2ed975 | 2111 | int iters = 0, ret = 0; |
500f9fba | 2112 | |
c7849be9 XW |
2113 | /* |
2114 | * We disallow the app entering submit/complete with polling, but we | |
2115 | * still need to lock the ring to prevent racing with polled issue | |
2116 | * that got punted to a workqueue. | |
2117 | */ | |
2118 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2119 | do { |
a3a0e43f JA |
2120 | /* |
2121 | * Don't enter poll loop if we already have events pending. | |
2122 | * If we do, we can potentially be spinning for commands that | |
2123 | * already triggered a CQE (eg in error). | |
2124 | */ | |
1d7bb1d5 | 2125 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2126 | break; |
2127 | ||
500f9fba JA |
2128 | /* |
2129 | * If a submit got punted to a workqueue, we can have the | |
2130 | * application entering polling for a command before it gets | |
2131 | * issued. That app will hold the uring_lock for the duration | |
2132 | * of the poll right here, so we need to take a breather every | |
2133 | * now and then to ensure that the issue has a chance to add | |
2134 | * the poll to the issued list. Otherwise we can spin here | |
2135 | * forever, while the workqueue is stuck trying to acquire the | |
2136 | * very same mutex. | |
2137 | */ | |
2138 | if (!(++iters & 7)) { | |
2139 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2140 | io_run_task_work(); |
500f9fba JA |
2141 | mutex_lock(&ctx->uring_lock); |
2142 | } | |
2143 | ||
7668b92a | 2144 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2145 | if (ret <= 0) |
2146 | break; | |
2147 | ret = 0; | |
7668b92a | 2148 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2149 | |
500f9fba | 2150 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2151 | return ret; |
2152 | } | |
2153 | ||
491381ce | 2154 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2155 | { |
491381ce JA |
2156 | /* |
2157 | * Tell lockdep we inherited freeze protection from submission | |
2158 | * thread. | |
2159 | */ | |
2160 | if (req->flags & REQ_F_ISREG) { | |
2161 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2162 | |
491381ce | 2163 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2164 | } |
491381ce | 2165 | file_end_write(req->file); |
2b188cc1 JA |
2166 | } |
2167 | ||
a1d7c393 JA |
2168 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2169 | struct io_comp_state *cs) | |
2b188cc1 | 2170 | { |
9adbd45d | 2171 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2172 | int cflags = 0; |
2b188cc1 | 2173 | |
491381ce JA |
2174 | if (kiocb->ki_flags & IOCB_WRITE) |
2175 | kiocb_end_write(req); | |
2b188cc1 | 2176 | |
4e88d6e7 JA |
2177 | if (res != req->result) |
2178 | req_set_fail_links(req); | |
bcda7baa JA |
2179 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2180 | cflags = io_put_kbuf(req); | |
a1d7c393 | 2181 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2182 | } |
2183 | ||
b63534c4 JA |
2184 | #ifdef CONFIG_BLOCK |
2185 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2186 | { | |
2187 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2188 | ssize_t ret = -ECANCELED; | |
2189 | struct iov_iter iter; | |
2190 | int rw; | |
2191 | ||
2192 | if (error) { | |
2193 | ret = error; | |
2194 | goto end_req; | |
2195 | } | |
2196 | ||
2197 | switch (req->opcode) { | |
2198 | case IORING_OP_READV: | |
2199 | case IORING_OP_READ_FIXED: | |
2200 | case IORING_OP_READ: | |
2201 | rw = READ; | |
2202 | break; | |
2203 | case IORING_OP_WRITEV: | |
2204 | case IORING_OP_WRITE_FIXED: | |
2205 | case IORING_OP_WRITE: | |
2206 | rw = WRITE; | |
2207 | break; | |
2208 | default: | |
2209 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2210 | req->opcode); | |
2211 | goto end_req; | |
2212 | } | |
2213 | ||
2214 | ret = io_import_iovec(rw, req, &iovec, &iter, false); | |
2215 | if (ret < 0) | |
2216 | goto end_req; | |
2217 | ret = io_setup_async_rw(req, ret, iovec, inline_vecs, &iter); | |
2218 | if (!ret) | |
2219 | return true; | |
2220 | kfree(iovec); | |
2221 | end_req: | |
b63534c4 | 2222 | req_set_fail_links(req); |
e1e16097 | 2223 | io_req_complete(req, ret); |
b63534c4 JA |
2224 | return false; |
2225 | } | |
2226 | ||
2227 | static void io_rw_resubmit(struct callback_head *cb) | |
2228 | { | |
2229 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2230 | struct io_ring_ctx *ctx = req->ctx; | |
2231 | int err; | |
2232 | ||
b63534c4 JA |
2233 | err = io_sq_thread_acquire_mm(ctx, req); |
2234 | ||
2235 | if (io_resubmit_prep(req, err)) { | |
2236 | refcount_inc(&req->refs); | |
2237 | io_queue_async_work(req); | |
2238 | } | |
2239 | } | |
2240 | #endif | |
2241 | ||
2242 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2243 | { | |
2244 | #ifdef CONFIG_BLOCK | |
b63534c4 JA |
2245 | int ret; |
2246 | ||
2247 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) | |
2248 | return false; | |
2249 | ||
b63534c4 | 2250 | init_task_work(&req->task_work, io_rw_resubmit); |
c2c4c83c JA |
2251 | ret = io_req_task_work_add(req, &req->task_work); |
2252 | if (!ret) | |
b63534c4 JA |
2253 | return true; |
2254 | #endif | |
2255 | return false; | |
2256 | } | |
2257 | ||
a1d7c393 JA |
2258 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2259 | struct io_comp_state *cs) | |
2260 | { | |
2261 | if (!io_rw_reissue(req, res)) | |
2262 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
2263 | } | |
2264 | ||
ba816ad6 JA |
2265 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) |
2266 | { | |
9adbd45d | 2267 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2268 | |
a1d7c393 | 2269 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2270 | } |
2271 | ||
def596e9 JA |
2272 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2273 | { | |
9adbd45d | 2274 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2275 | |
491381ce JA |
2276 | if (kiocb->ki_flags & IOCB_WRITE) |
2277 | kiocb_end_write(req); | |
def596e9 | 2278 | |
2d7d6792 | 2279 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2280 | req_set_fail_links(req); |
bbde017a XW |
2281 | |
2282 | WRITE_ONCE(req->result, res); | |
2283 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2284 | smp_wmb(); |
2285 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2290 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2291 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2292 | * accessing the kiocb cookie. | |
2293 | */ | |
2294 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2295 | { | |
2296 | struct io_ring_ctx *ctx = req->ctx; | |
2297 | ||
2298 | /* | |
2299 | * Track whether we have multiple files in our lists. This will impact | |
2300 | * how we do polling eventually, not spinning if we're on potentially | |
2301 | * different devices. | |
2302 | */ | |
540e32a0 | 2303 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2304 | ctx->poll_multi_file = false; |
2305 | } else if (!ctx->poll_multi_file) { | |
2306 | struct io_kiocb *list_req; | |
2307 | ||
540e32a0 | 2308 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2309 | inflight_entry); |
9adbd45d | 2310 | if (list_req->file != req->file) |
def596e9 JA |
2311 | ctx->poll_multi_file = true; |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * For fast devices, IO may have already completed. If it has, add | |
2316 | * it to the front so we find it first. | |
2317 | */ | |
65a6543d | 2318 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2319 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2320 | else |
d21ffe7e | 2321 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2322 | |
2323 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2324 | wq_has_sleeper(&ctx->sqo_wait)) | |
2325 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2326 | } |
2327 | ||
9f13c35b | 2328 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2329 | { |
9f13c35b | 2330 | int diff = state->has_refs - state->used_refs; |
9a56a232 | 2331 | |
9f13c35b PB |
2332 | if (diff) |
2333 | fput_many(state->file, diff); | |
2334 | state->file = NULL; | |
2335 | } | |
2336 | ||
2337 | static inline void io_state_file_put(struct io_submit_state *state) | |
2338 | { | |
2339 | if (state->file) | |
2340 | __io_state_file_put(state); | |
9a56a232 JA |
2341 | } |
2342 | ||
2343 | /* | |
2344 | * Get as many references to a file as we have IOs left in this submission, | |
2345 | * assuming most submissions are for one file, or at least that each file | |
2346 | * has more than one submission. | |
2347 | */ | |
8da11c19 | 2348 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2349 | { |
2350 | if (!state) | |
2351 | return fget(fd); | |
2352 | ||
2353 | if (state->file) { | |
2354 | if (state->fd == fd) { | |
2355 | state->used_refs++; | |
2356 | state->ios_left--; | |
2357 | return state->file; | |
2358 | } | |
9f13c35b | 2359 | __io_state_file_put(state); |
9a56a232 JA |
2360 | } |
2361 | state->file = fget_many(fd, state->ios_left); | |
2362 | if (!state->file) | |
2363 | return NULL; | |
2364 | ||
2365 | state->fd = fd; | |
2366 | state->has_refs = state->ios_left; | |
2367 | state->used_refs = 1; | |
2368 | state->ios_left--; | |
2369 | return state->file; | |
2370 | } | |
2371 | ||
4503b767 JA |
2372 | static bool io_bdev_nowait(struct block_device *bdev) |
2373 | { | |
2374 | #ifdef CONFIG_BLOCK | |
2375 | return !bdev || queue_is_mq(bdev_get_queue(bdev)); | |
2376 | #else | |
2377 | return true; | |
2378 | #endif | |
2379 | } | |
2380 | ||
2b188cc1 JA |
2381 | /* |
2382 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2383 | * any file. For now, just ensure that anything potentially problematic is done | |
2384 | * inline. | |
2385 | */ | |
af197f50 | 2386 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2387 | { |
2388 | umode_t mode = file_inode(file)->i_mode; | |
2389 | ||
4503b767 JA |
2390 | if (S_ISBLK(mode)) { |
2391 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2392 | return true; | |
2393 | return false; | |
2394 | } | |
2395 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2396 | return true; |
4503b767 JA |
2397 | if (S_ISREG(mode)) { |
2398 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2399 | file->f_op != &io_uring_fops) | |
2400 | return true; | |
2401 | return false; | |
2402 | } | |
2b188cc1 | 2403 | |
c5b85625 JA |
2404 | /* any ->read/write should understand O_NONBLOCK */ |
2405 | if (file->f_flags & O_NONBLOCK) | |
2406 | return true; | |
2407 | ||
af197f50 JA |
2408 | if (!(file->f_mode & FMODE_NOWAIT)) |
2409 | return false; | |
2410 | ||
2411 | if (rw == READ) | |
2412 | return file->f_op->read_iter != NULL; | |
2413 | ||
2414 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2415 | } |
2416 | ||
3529d8c2 JA |
2417 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2418 | bool force_nonblock) | |
2b188cc1 | 2419 | { |
def596e9 | 2420 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2421 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2422 | unsigned ioprio; |
2423 | int ret; | |
2b188cc1 | 2424 | |
491381ce JA |
2425 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2426 | req->flags |= REQ_F_ISREG; | |
2427 | ||
2b188cc1 | 2428 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2429 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2430 | req->flags |= REQ_F_CUR_POS; | |
2431 | kiocb->ki_pos = req->file->f_pos; | |
2432 | } | |
2b188cc1 | 2433 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2434 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2435 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2436 | if (unlikely(ret)) | |
2437 | return ret; | |
2b188cc1 JA |
2438 | |
2439 | ioprio = READ_ONCE(sqe->ioprio); | |
2440 | if (ioprio) { | |
2441 | ret = ioprio_check_cap(ioprio); | |
2442 | if (ret) | |
09bb8394 | 2443 | return ret; |
2b188cc1 JA |
2444 | |
2445 | kiocb->ki_ioprio = ioprio; | |
2446 | } else | |
2447 | kiocb->ki_ioprio = get_current_ioprio(); | |
2448 | ||
8449eeda | 2449 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2450 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2451 | req->flags |= REQ_F_NOWAIT; |
2452 | ||
b63534c4 JA |
2453 | if (kiocb->ki_flags & IOCB_DIRECT) |
2454 | io_get_req_task(req); | |
2455 | ||
8449eeda | 2456 | if (force_nonblock) |
2b188cc1 | 2457 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2458 | |
def596e9 | 2459 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2460 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2461 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2462 | return -EOPNOTSUPP; |
2b188cc1 | 2463 | |
def596e9 JA |
2464 | kiocb->ki_flags |= IOCB_HIPRI; |
2465 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2466 | req->iopoll_completed = 0; |
f3a6fa22 | 2467 | io_get_req_task(req); |
def596e9 | 2468 | } else { |
09bb8394 JA |
2469 | if (kiocb->ki_flags & IOCB_HIPRI) |
2470 | return -EINVAL; | |
def596e9 JA |
2471 | kiocb->ki_complete = io_complete_rw; |
2472 | } | |
9adbd45d | 2473 | |
3529d8c2 JA |
2474 | req->rw.addr = READ_ONCE(sqe->addr); |
2475 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2476 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2477 | return 0; |
2b188cc1 JA |
2478 | } |
2479 | ||
2480 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2481 | { | |
2482 | switch (ret) { | |
2483 | case -EIOCBQUEUED: | |
2484 | break; | |
2485 | case -ERESTARTSYS: | |
2486 | case -ERESTARTNOINTR: | |
2487 | case -ERESTARTNOHAND: | |
2488 | case -ERESTART_RESTARTBLOCK: | |
2489 | /* | |
2490 | * We can't just restart the syscall, since previously | |
2491 | * submitted sqes may already be in progress. Just fail this | |
2492 | * IO with EINTR. | |
2493 | */ | |
2494 | ret = -EINTR; | |
2495 | /* fall through */ | |
2496 | default: | |
2497 | kiocb->ki_complete(kiocb, ret, 0); | |
2498 | } | |
2499 | } | |
2500 | ||
a1d7c393 JA |
2501 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2502 | struct io_comp_state *cs) | |
ba816ad6 | 2503 | { |
ba04291e JA |
2504 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2505 | ||
2506 | if (req->flags & REQ_F_CUR_POS) | |
2507 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2508 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2509 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2510 | else |
2511 | io_rw_done(kiocb, ret); | |
2512 | } | |
2513 | ||
9adbd45d | 2514 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2515 | struct iov_iter *iter) |
edafccee | 2516 | { |
9adbd45d JA |
2517 | struct io_ring_ctx *ctx = req->ctx; |
2518 | size_t len = req->rw.len; | |
edafccee | 2519 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2520 | u16 index, buf_index; |
edafccee JA |
2521 | size_t offset; |
2522 | u64 buf_addr; | |
2523 | ||
2524 | /* attempt to use fixed buffers without having provided iovecs */ | |
2525 | if (unlikely(!ctx->user_bufs)) | |
2526 | return -EFAULT; | |
2527 | ||
4f4eeba8 | 2528 | buf_index = req->buf_index; |
edafccee JA |
2529 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2530 | return -EFAULT; | |
2531 | ||
2532 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2533 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2534 | buf_addr = req->rw.addr; |
edafccee JA |
2535 | |
2536 | /* overflow */ | |
2537 | if (buf_addr + len < buf_addr) | |
2538 | return -EFAULT; | |
2539 | /* not inside the mapped region */ | |
2540 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2541 | return -EFAULT; | |
2542 | ||
2543 | /* | |
2544 | * May not be a start of buffer, set size appropriately | |
2545 | * and advance us to the beginning. | |
2546 | */ | |
2547 | offset = buf_addr - imu->ubuf; | |
2548 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2549 | |
2550 | if (offset) { | |
2551 | /* | |
2552 | * Don't use iov_iter_advance() here, as it's really slow for | |
2553 | * using the latter parts of a big fixed buffer - it iterates | |
2554 | * over each segment manually. We can cheat a bit here, because | |
2555 | * we know that: | |
2556 | * | |
2557 | * 1) it's a BVEC iter, we set it up | |
2558 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2559 | * first and last bvec | |
2560 | * | |
2561 | * So just find our index, and adjust the iterator afterwards. | |
2562 | * If the offset is within the first bvec (or the whole first | |
2563 | * bvec, just use iov_iter_advance(). This makes it easier | |
2564 | * since we can just skip the first segment, which may not | |
2565 | * be PAGE_SIZE aligned. | |
2566 | */ | |
2567 | const struct bio_vec *bvec = imu->bvec; | |
2568 | ||
2569 | if (offset <= bvec->bv_len) { | |
2570 | iov_iter_advance(iter, offset); | |
2571 | } else { | |
2572 | unsigned long seg_skip; | |
2573 | ||
2574 | /* skip first vec */ | |
2575 | offset -= bvec->bv_len; | |
2576 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2577 | ||
2578 | iter->bvec = bvec + seg_skip; | |
2579 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2580 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2581 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2582 | } |
2583 | } | |
2584 | ||
5e559561 | 2585 | return len; |
edafccee JA |
2586 | } |
2587 | ||
bcda7baa JA |
2588 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2589 | { | |
2590 | if (needs_lock) | |
2591 | mutex_unlock(&ctx->uring_lock); | |
2592 | } | |
2593 | ||
2594 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2595 | { | |
2596 | /* | |
2597 | * "Normal" inline submissions always hold the uring_lock, since we | |
2598 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2599 | * The only exception is when we've detached the request and issue it | |
2600 | * from an async worker thread, grab the lock for that case. | |
2601 | */ | |
2602 | if (needs_lock) | |
2603 | mutex_lock(&ctx->uring_lock); | |
2604 | } | |
2605 | ||
2606 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2607 | int bgid, struct io_buffer *kbuf, | |
2608 | bool needs_lock) | |
2609 | { | |
2610 | struct io_buffer *head; | |
2611 | ||
2612 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2613 | return kbuf; | |
2614 | ||
2615 | io_ring_submit_lock(req->ctx, needs_lock); | |
2616 | ||
2617 | lockdep_assert_held(&req->ctx->uring_lock); | |
2618 | ||
2619 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2620 | if (head) { | |
2621 | if (!list_empty(&head->list)) { | |
2622 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2623 | list); | |
2624 | list_del(&kbuf->list); | |
2625 | } else { | |
2626 | kbuf = head; | |
2627 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2628 | } | |
2629 | if (*len > kbuf->len) | |
2630 | *len = kbuf->len; | |
2631 | } else { | |
2632 | kbuf = ERR_PTR(-ENOBUFS); | |
2633 | } | |
2634 | ||
2635 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2636 | ||
2637 | return kbuf; | |
2638 | } | |
2639 | ||
4d954c25 JA |
2640 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2641 | bool needs_lock) | |
2642 | { | |
2643 | struct io_buffer *kbuf; | |
4f4eeba8 | 2644 | u16 bgid; |
4d954c25 JA |
2645 | |
2646 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2647 | bgid = req->buf_index; |
4d954c25 JA |
2648 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2649 | if (IS_ERR(kbuf)) | |
2650 | return kbuf; | |
2651 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2652 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2653 | return u64_to_user_ptr(kbuf->addr); | |
2654 | } | |
2655 | ||
2656 | #ifdef CONFIG_COMPAT | |
2657 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2658 | bool needs_lock) | |
2659 | { | |
2660 | struct compat_iovec __user *uiov; | |
2661 | compat_ssize_t clen; | |
2662 | void __user *buf; | |
2663 | ssize_t len; | |
2664 | ||
2665 | uiov = u64_to_user_ptr(req->rw.addr); | |
2666 | if (!access_ok(uiov, sizeof(*uiov))) | |
2667 | return -EFAULT; | |
2668 | if (__get_user(clen, &uiov->iov_len)) | |
2669 | return -EFAULT; | |
2670 | if (clen < 0) | |
2671 | return -EINVAL; | |
2672 | ||
2673 | len = clen; | |
2674 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2675 | if (IS_ERR(buf)) | |
2676 | return PTR_ERR(buf); | |
2677 | iov[0].iov_base = buf; | |
2678 | iov[0].iov_len = (compat_size_t) len; | |
2679 | return 0; | |
2680 | } | |
2681 | #endif | |
2682 | ||
2683 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2684 | bool needs_lock) | |
2685 | { | |
2686 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2687 | void __user *buf; | |
2688 | ssize_t len; | |
2689 | ||
2690 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2691 | return -EFAULT; | |
2692 | ||
2693 | len = iov[0].iov_len; | |
2694 | if (len < 0) | |
2695 | return -EINVAL; | |
2696 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2697 | if (IS_ERR(buf)) | |
2698 | return PTR_ERR(buf); | |
2699 | iov[0].iov_base = buf; | |
2700 | iov[0].iov_len = len; | |
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2705 | bool needs_lock) | |
2706 | { | |
dddb3e26 JA |
2707 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2708 | struct io_buffer *kbuf; | |
2709 | ||
2710 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2711 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2712 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2713 | return 0; |
dddb3e26 | 2714 | } |
4d954c25 JA |
2715 | if (!req->rw.len) |
2716 | return 0; | |
2717 | else if (req->rw.len > 1) | |
2718 | return -EINVAL; | |
2719 | ||
2720 | #ifdef CONFIG_COMPAT | |
2721 | if (req->ctx->compat) | |
2722 | return io_compat_import(req, iov, needs_lock); | |
2723 | #endif | |
2724 | ||
2725 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2726 | } | |
2727 | ||
cf6fd4bd | 2728 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2729 | struct iovec **iovec, struct iov_iter *iter, |
2730 | bool needs_lock) | |
2b188cc1 | 2731 | { |
9adbd45d JA |
2732 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2733 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2734 | ssize_t ret; |
edafccee JA |
2735 | u8 opcode; |
2736 | ||
d625c6ee | 2737 | opcode = req->opcode; |
7d009165 | 2738 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2739 | *iovec = NULL; |
9adbd45d | 2740 | return io_import_fixed(req, rw, iter); |
edafccee | 2741 | } |
2b188cc1 | 2742 | |
bcda7baa | 2743 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2744 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2745 | return -EINVAL; |
2746 | ||
3a6820f2 | 2747 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2748 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2749 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2750 | if (IS_ERR(buf)) { | |
bcda7baa | 2751 | *iovec = NULL; |
4d954c25 | 2752 | return PTR_ERR(buf); |
bcda7baa | 2753 | } |
3f9d6441 | 2754 | req->rw.len = sqe_len; |
bcda7baa JA |
2755 | } |
2756 | ||
3a6820f2 JA |
2757 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2758 | *iovec = NULL; | |
3a901598 | 2759 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2760 | } |
2761 | ||
f67676d1 JA |
2762 | if (req->io) { |
2763 | struct io_async_rw *iorw = &req->io->rw; | |
2764 | ||
252917c3 PB |
2765 | iov_iter_init(iter, rw, iorw->iov, iorw->nr_segs, iorw->size); |
2766 | *iovec = NULL; | |
f67676d1 JA |
2767 | return iorw->size; |
2768 | } | |
2769 | ||
4d954c25 JA |
2770 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2771 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2772 | if (!ret) { |
2773 | ret = (*iovec)->iov_len; | |
2774 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2775 | } | |
4d954c25 JA |
2776 | *iovec = NULL; |
2777 | return ret; | |
2778 | } | |
2779 | ||
2b188cc1 | 2780 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2781 | if (req->ctx->compat) |
2b188cc1 JA |
2782 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2783 | iovec, iter); | |
2784 | #endif | |
2785 | ||
2786 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2787 | } | |
2788 | ||
31b51510 | 2789 | /* |
32960613 JA |
2790 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2791 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2792 | */ |
32960613 JA |
2793 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2794 | struct iov_iter *iter) | |
2795 | { | |
2796 | ssize_t ret = 0; | |
2797 | ||
2798 | /* | |
2799 | * Don't support polled IO through this interface, and we can't | |
2800 | * support non-blocking either. For the latter, this just causes | |
2801 | * the kiocb to be handled from an async context. | |
2802 | */ | |
2803 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2804 | return -EOPNOTSUPP; | |
2805 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2806 | return -EAGAIN; | |
2807 | ||
2808 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2809 | struct iovec iovec; |
32960613 JA |
2810 | ssize_t nr; |
2811 | ||
311ae9e1 PB |
2812 | if (!iov_iter_is_bvec(iter)) { |
2813 | iovec = iov_iter_iovec(iter); | |
2814 | } else { | |
2815 | /* fixed buffers import bvec */ | |
2816 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2817 | + iter->iov_offset; | |
2818 | iovec.iov_len = min(iter->count, | |
2819 | iter->bvec->bv_len - iter->iov_offset); | |
2820 | } | |
2821 | ||
32960613 JA |
2822 | if (rw == READ) { |
2823 | nr = file->f_op->read(file, iovec.iov_base, | |
2824 | iovec.iov_len, &kiocb->ki_pos); | |
2825 | } else { | |
2826 | nr = file->f_op->write(file, iovec.iov_base, | |
2827 | iovec.iov_len, &kiocb->ki_pos); | |
2828 | } | |
2829 | ||
311ae9e1 PB |
2830 | if (iov_iter_is_bvec(iter)) |
2831 | kunmap(iter->bvec->bv_page); | |
2832 | ||
32960613 JA |
2833 | if (nr < 0) { |
2834 | if (!ret) | |
2835 | ret = nr; | |
2836 | break; | |
2837 | } | |
2838 | ret += nr; | |
2839 | if (nr != iovec.iov_len) | |
2840 | break; | |
2841 | iov_iter_advance(iter, nr); | |
2842 | } | |
2843 | ||
2844 | return ret; | |
2845 | } | |
2846 | ||
b7bb4f7d | 2847 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2848 | struct iovec *iovec, struct iovec *fast_iov, |
2849 | struct iov_iter *iter) | |
2850 | { | |
b64e3444 PB |
2851 | struct io_async_rw *rw = &req->io->rw; |
2852 | ||
2853 | rw->nr_segs = iter->nr_segs; | |
2854 | rw->size = io_size; | |
2855 | if (!iovec) { | |
2856 | rw->iov = rw->fast_iov; | |
2857 | if (rw->iov != fast_iov) | |
2858 | memcpy(rw->iov, fast_iov, | |
45097dae | 2859 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 | 2860 | } else { |
b64e3444 | 2861 | rw->iov = iovec; |
99bc4c38 | 2862 | req->flags |= REQ_F_NEED_CLEANUP; |
f67676d1 JA |
2863 | } |
2864 | } | |
2865 | ||
3d9932a8 XW |
2866 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2867 | { | |
2868 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2869 | return req->io == NULL; | |
2870 | } | |
2871 | ||
b7bb4f7d | 2872 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2873 | { |
d3656344 JA |
2874 | if (!io_op_defs[req->opcode].async_ctx) |
2875 | return 0; | |
3d9932a8 XW |
2876 | |
2877 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2878 | } |
2879 | ||
b7bb4f7d JA |
2880 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2881 | struct iovec *iovec, struct iovec *fast_iov, | |
2882 | struct iov_iter *iter) | |
2883 | { | |
980ad263 | 2884 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2885 | return 0; |
5d204bcf | 2886 | if (!req->io) { |
3d9932a8 | 2887 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2888 | return -ENOMEM; |
b7bb4f7d | 2889 | |
5d204bcf JA |
2890 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2891 | } | |
b7bb4f7d | 2892 | return 0; |
f67676d1 JA |
2893 | } |
2894 | ||
c3e330a4 PB |
2895 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw, |
2896 | bool force_nonblock) | |
2897 | { | |
2898 | struct io_async_ctx *io = req->io; | |
2899 | struct iov_iter iter; | |
2900 | ssize_t ret; | |
2901 | ||
2902 | io->rw.iov = io->rw.fast_iov; | |
2903 | req->io = NULL; | |
2904 | ret = io_import_iovec(rw, req, &io->rw.iov, &iter, !force_nonblock); | |
2905 | req->io = io; | |
2906 | if (unlikely(ret < 0)) | |
2907 | return ret; | |
2908 | ||
2909 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2910 | return 0; | |
2911 | } | |
2912 | ||
3529d8c2 JA |
2913 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2914 | bool force_nonblock) | |
f67676d1 JA |
2915 | { |
2916 | ssize_t ret; | |
2917 | ||
3529d8c2 JA |
2918 | ret = io_prep_rw(req, sqe, force_nonblock); |
2919 | if (ret) | |
2920 | return ret; | |
f67676d1 | 2921 | |
3529d8c2 JA |
2922 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2923 | return -EBADF; | |
f67676d1 | 2924 | |
5f798bea PB |
2925 | /* either don't need iovec imported or already have it */ |
2926 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 2927 | return 0; |
c3e330a4 | 2928 | return io_rw_prep_async(req, READ, force_nonblock); |
f67676d1 JA |
2929 | } |
2930 | ||
bcf5a063 JA |
2931 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
2932 | int sync, void *arg) | |
2933 | { | |
2934 | struct wait_page_queue *wpq; | |
2935 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 2936 | struct wait_page_key *key = arg; |
bcf5a063 JA |
2937 | int ret; |
2938 | ||
2939 | wpq = container_of(wait, struct wait_page_queue, wait); | |
2940 | ||
2941 | ret = wake_page_match(wpq, key); | |
2942 | if (ret != 1) | |
2943 | return ret; | |
2944 | ||
2945 | list_del_init(&wait->entry); | |
2946 | ||
e7375122 | 2947 | init_task_work(&req->task_work, io_req_task_submit); |
bcf5a063 JA |
2948 | /* submit ref gets dropped, acquire a new one */ |
2949 | refcount_inc(&req->refs); | |
e7375122 | 2950 | ret = io_req_task_work_add(req, &req->task_work); |
bcf5a063 | 2951 | if (unlikely(ret)) { |
c2c4c83c JA |
2952 | struct task_struct *tsk; |
2953 | ||
bcf5a063 | 2954 | /* queue just for cancelation */ |
e7375122 | 2955 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 2956 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 2957 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 2958 | wake_up_process(tsk); |
bcf5a063 | 2959 | } |
bcf5a063 JA |
2960 | return 1; |
2961 | } | |
2962 | ||
2963 | static bool io_rw_should_retry(struct io_kiocb *req) | |
2964 | { | |
2965 | struct kiocb *kiocb = &req->rw.kiocb; | |
2966 | int ret; | |
2967 | ||
2968 | /* never retry for NOWAIT, we just complete with -EAGAIN */ | |
2969 | if (req->flags & REQ_F_NOWAIT) | |
2970 | return false; | |
2971 | ||
2972 | /* already tried, or we're doing O_DIRECT */ | |
2973 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_WAITQ)) | |
2974 | return false; | |
2975 | /* | |
2976 | * just use poll if we can, and don't attempt if the fs doesn't | |
2977 | * support callback based unlocks | |
2978 | */ | |
2979 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
2980 | return false; | |
2981 | ||
2982 | /* | |
2983 | * If request type doesn't require req->io to defer in general, | |
2984 | * we need to allocate it here | |
2985 | */ | |
2986 | if (!req->io && __io_alloc_async_ctx(req)) | |
2987 | return false; | |
2988 | ||
2989 | ret = kiocb_wait_page_queue_init(kiocb, &req->io->rw.wpq, | |
2990 | io_async_buf_func, req); | |
2991 | if (!ret) { | |
2992 | io_get_req_task(req); | |
2993 | return true; | |
2994 | } | |
2995 | ||
2996 | return false; | |
2997 | } | |
2998 | ||
2999 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3000 | { | |
3001 | if (req->file->f_op->read_iter) | |
3002 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
3003 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3004 | } | |
3005 | ||
a1d7c393 JA |
3006 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3007 | struct io_comp_state *cs) | |
2b188cc1 JA |
3008 | { |
3009 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3010 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3011 | struct iov_iter iter; |
31b51510 | 3012 | size_t iov_count; |
f67676d1 | 3013 | ssize_t io_size, ret; |
2b188cc1 | 3014 | |
bcda7baa | 3015 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3016 | if (ret < 0) |
3017 | return ret; | |
2b188cc1 | 3018 | |
fd6c2e4c JA |
3019 | /* Ensure we clear previously set non-block flag */ |
3020 | if (!force_nonblock) | |
29de5f6a | 3021 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3022 | |
f67676d1 | 3023 | io_size = ret; |
6795c5ab | 3024 | req->result = io_size; |
f67676d1 | 3025 | |
24c74678 | 3026 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3027 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 3028 | goto copy_iov; |
9e645e11 | 3029 | |
31b51510 | 3030 | iov_count = iov_iter_count(&iter); |
9adbd45d | 3031 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 3032 | if (!ret) { |
b63534c4 | 3033 | unsigned long nr_segs = iter.nr_segs; |
4503b767 | 3034 | ssize_t ret2 = 0; |
2b188cc1 | 3035 | |
bcf5a063 | 3036 | ret2 = io_iter_do_read(req, &iter); |
32960613 | 3037 | |
9d93a3f5 | 3038 | /* Catch -EAGAIN return for forced non-blocking submission */ |
4503b767 | 3039 | if (!force_nonblock || (ret2 != -EAGAIN && ret2 != -EIO)) { |
a1d7c393 | 3040 | kiocb_done(kiocb, ret2, cs); |
f67676d1 | 3041 | } else { |
b63534c4 JA |
3042 | iter.count = iov_count; |
3043 | iter.nr_segs = nr_segs; | |
f67676d1 | 3044 | copy_iov: |
b7bb4f7d | 3045 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
3046 | inline_vecs, &iter); |
3047 | if (ret) | |
3048 | goto out_free; | |
252917c3 PB |
3049 | /* it's copied and will be cleaned with ->io */ |
3050 | iovec = NULL; | |
bcf5a063 JA |
3051 | /* if we can retry, do so with the callbacks armed */ |
3052 | if (io_rw_should_retry(req)) { | |
3053 | ret2 = io_iter_do_read(req, &iter); | |
3054 | if (ret2 == -EIOCBQUEUED) { | |
3055 | goto out_free; | |
3056 | } else if (ret2 != -EAGAIN) { | |
a1d7c393 | 3057 | kiocb_done(kiocb, ret2, cs); |
bcf5a063 JA |
3058 | goto out_free; |
3059 | } | |
3060 | } | |
3061 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
f67676d1 JA |
3062 | return -EAGAIN; |
3063 | } | |
2b188cc1 | 3064 | } |
f67676d1 | 3065 | out_free: |
252917c3 | 3066 | if (iovec) |
6f2cc166 | 3067 | kfree(iovec); |
2b188cc1 JA |
3068 | return ret; |
3069 | } | |
3070 | ||
3529d8c2 JA |
3071 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3072 | bool force_nonblock) | |
f67676d1 JA |
3073 | { |
3074 | ssize_t ret; | |
3075 | ||
3529d8c2 JA |
3076 | ret = io_prep_rw(req, sqe, force_nonblock); |
3077 | if (ret) | |
3078 | return ret; | |
f67676d1 | 3079 | |
3529d8c2 JA |
3080 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3081 | return -EBADF; | |
f67676d1 | 3082 | |
5f798bea PB |
3083 | /* either don't need iovec imported or already have it */ |
3084 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3085 | return 0; |
c3e330a4 | 3086 | return io_rw_prep_async(req, WRITE, force_nonblock); |
f67676d1 JA |
3087 | } |
3088 | ||
a1d7c393 JA |
3089 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3090 | struct io_comp_state *cs) | |
2b188cc1 JA |
3091 | { |
3092 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3093 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3094 | struct iov_iter iter; |
31b51510 | 3095 | size_t iov_count; |
f67676d1 | 3096 | ssize_t ret, io_size; |
2b188cc1 | 3097 | |
bcda7baa | 3098 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3099 | if (ret < 0) |
3100 | return ret; | |
2b188cc1 | 3101 | |
fd6c2e4c JA |
3102 | /* Ensure we clear previously set non-block flag */ |
3103 | if (!force_nonblock) | |
9adbd45d | 3104 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3105 | |
f67676d1 | 3106 | io_size = ret; |
6795c5ab | 3107 | req->result = io_size; |
9e645e11 | 3108 | |
24c74678 | 3109 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3110 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3111 | goto copy_iov; |
31b51510 | 3112 | |
10d59345 JA |
3113 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3114 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3115 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3116 | goto copy_iov; |
31b51510 | 3117 | |
f67676d1 | 3118 | iov_count = iov_iter_count(&iter); |
9adbd45d | 3119 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 3120 | if (!ret) { |
b63534c4 | 3121 | unsigned long nr_segs = iter.nr_segs; |
9bf7933f RP |
3122 | ssize_t ret2; |
3123 | ||
2b188cc1 JA |
3124 | /* |
3125 | * Open-code file_start_write here to grab freeze protection, | |
3126 | * which will be released by another thread in | |
3127 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3128 | * released so that it doesn't complain about the held lock when | |
3129 | * we return to userspace. | |
3130 | */ | |
491381ce | 3131 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 3132 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 3133 | SB_FREEZE_WRITE, true); |
9adbd45d | 3134 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
3135 | SB_FREEZE_WRITE); |
3136 | } | |
3137 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 3138 | |
9adbd45d JA |
3139 | if (req->file->f_op->write_iter) |
3140 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 3141 | else |
9adbd45d | 3142 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 | 3143 | |
faac996c | 3144 | /* |
bff6035d | 3145 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
3146 | * retry them without IOCB_NOWAIT. |
3147 | */ | |
3148 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3149 | ret2 = -EAGAIN; | |
f67676d1 | 3150 | if (!force_nonblock || ret2 != -EAGAIN) { |
a1d7c393 | 3151 | kiocb_done(kiocb, ret2, cs); |
f67676d1 | 3152 | } else { |
b63534c4 JA |
3153 | iter.count = iov_count; |
3154 | iter.nr_segs = nr_segs; | |
f67676d1 | 3155 | copy_iov: |
b7bb4f7d | 3156 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
3157 | inline_vecs, &iter); |
3158 | if (ret) | |
3159 | goto out_free; | |
252917c3 PB |
3160 | /* it's copied and will be cleaned with ->io */ |
3161 | iovec = NULL; | |
f67676d1 JA |
3162 | return -EAGAIN; |
3163 | } | |
2b188cc1 | 3164 | } |
31b51510 | 3165 | out_free: |
252917c3 | 3166 | if (iovec) |
6f2cc166 | 3167 | kfree(iovec); |
2b188cc1 JA |
3168 | return ret; |
3169 | } | |
3170 | ||
f2a8d5c7 PB |
3171 | static int __io_splice_prep(struct io_kiocb *req, |
3172 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3173 | { |
3174 | struct io_splice* sp = &req->splice; | |
3175 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3176 | int ret; | |
3177 | ||
3178 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3179 | return 0; | |
3232dd02 PB |
3180 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3181 | return -EINVAL; | |
7d67af2c PB |
3182 | |
3183 | sp->file_in = NULL; | |
7d67af2c PB |
3184 | sp->len = READ_ONCE(sqe->len); |
3185 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3186 | ||
3187 | if (unlikely(sp->flags & ~valid_flags)) | |
3188 | return -EINVAL; | |
3189 | ||
3190 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3191 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3192 | if (ret) | |
3193 | return ret; | |
3194 | req->flags |= REQ_F_NEED_CLEANUP; | |
3195 | ||
7cdaf587 XW |
3196 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3197 | /* | |
3198 | * Splice operation will be punted aync, and here need to | |
3199 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3200 | */ | |
3201 | io_req_init_async(req); | |
7d67af2c | 3202 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3203 | } |
7d67af2c PB |
3204 | |
3205 | return 0; | |
3206 | } | |
3207 | ||
f2a8d5c7 PB |
3208 | static int io_tee_prep(struct io_kiocb *req, |
3209 | const struct io_uring_sqe *sqe) | |
3210 | { | |
3211 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3212 | return -EINVAL; | |
3213 | return __io_splice_prep(req, sqe); | |
3214 | } | |
3215 | ||
3216 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3217 | { | |
3218 | struct io_splice *sp = &req->splice; | |
3219 | struct file *in = sp->file_in; | |
3220 | struct file *out = sp->file_out; | |
3221 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3222 | long ret = 0; | |
3223 | ||
3224 | if (force_nonblock) | |
3225 | return -EAGAIN; | |
3226 | if (sp->len) | |
3227 | ret = do_tee(in, out, sp->len, flags); | |
3228 | ||
3229 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3230 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3231 | ||
f2a8d5c7 PB |
3232 | if (ret != sp->len) |
3233 | req_set_fail_links(req); | |
e1e16097 | 3234 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3235 | return 0; |
3236 | } | |
3237 | ||
3238 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3239 | { | |
3240 | struct io_splice* sp = &req->splice; | |
3241 | ||
3242 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3243 | sp->off_out = READ_ONCE(sqe->off); | |
3244 | return __io_splice_prep(req, sqe); | |
3245 | } | |
3246 | ||
014db007 | 3247 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3248 | { |
3249 | struct io_splice *sp = &req->splice; | |
3250 | struct file *in = sp->file_in; | |
3251 | struct file *out = sp->file_out; | |
3252 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3253 | loff_t *poff_in, *poff_out; | |
c9687426 | 3254 | long ret = 0; |
7d67af2c | 3255 | |
2fb3e822 PB |
3256 | if (force_nonblock) |
3257 | return -EAGAIN; | |
7d67af2c PB |
3258 | |
3259 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3260 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3261 | |
948a7749 | 3262 | if (sp->len) |
c9687426 | 3263 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3264 | |
3265 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3266 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3267 | ||
7d67af2c PB |
3268 | if (ret != sp->len) |
3269 | req_set_fail_links(req); | |
e1e16097 | 3270 | io_req_complete(req, ret); |
7d67af2c PB |
3271 | return 0; |
3272 | } | |
3273 | ||
2b188cc1 JA |
3274 | /* |
3275 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3276 | */ | |
229a7b63 | 3277 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3278 | { |
3279 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3280 | |
def596e9 JA |
3281 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3282 | return -EINVAL; | |
3283 | ||
229a7b63 | 3284 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3285 | return 0; |
3286 | } | |
3287 | ||
3529d8c2 | 3288 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3289 | { |
6b06314c | 3290 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3291 | |
09bb8394 JA |
3292 | if (!req->file) |
3293 | return -EBADF; | |
c992fe29 | 3294 | |
6b06314c | 3295 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3296 | return -EINVAL; |
edafccee | 3297 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3298 | return -EINVAL; |
3299 | ||
8ed8d3c3 JA |
3300 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3301 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3302 | return -EINVAL; | |
3303 | ||
3304 | req->sync.off = READ_ONCE(sqe->off); | |
3305 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3306 | return 0; |
3307 | } | |
3308 | ||
ac45abc0 | 3309 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3310 | { |
8ed8d3c3 | 3311 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3312 | int ret; |
3313 | ||
ac45abc0 PB |
3314 | /* fsync always requires a blocking context */ |
3315 | if (force_nonblock) | |
3316 | return -EAGAIN; | |
3317 | ||
9adbd45d | 3318 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3319 | end > 0 ? end : LLONG_MAX, |
3320 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3321 | if (ret < 0) | |
3322 | req_set_fail_links(req); | |
e1e16097 | 3323 | io_req_complete(req, ret); |
c992fe29 CH |
3324 | return 0; |
3325 | } | |
3326 | ||
d63d1b5e JA |
3327 | static int io_fallocate_prep(struct io_kiocb *req, |
3328 | const struct io_uring_sqe *sqe) | |
3329 | { | |
3330 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3331 | return -EINVAL; | |
3232dd02 PB |
3332 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3333 | return -EINVAL; | |
d63d1b5e JA |
3334 | |
3335 | req->sync.off = READ_ONCE(sqe->off); | |
3336 | req->sync.len = READ_ONCE(sqe->addr); | |
3337 | req->sync.mode = READ_ONCE(sqe->len); | |
3338 | return 0; | |
3339 | } | |
3340 | ||
014db007 | 3341 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3342 | { |
ac45abc0 PB |
3343 | int ret; |
3344 | ||
d63d1b5e | 3345 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3346 | if (force_nonblock) |
5d17b4a4 | 3347 | return -EAGAIN; |
ac45abc0 PB |
3348 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3349 | req->sync.len); | |
ac45abc0 PB |
3350 | if (ret < 0) |
3351 | req_set_fail_links(req); | |
e1e16097 | 3352 | io_req_complete(req, ret); |
5d17b4a4 JA |
3353 | return 0; |
3354 | } | |
3355 | ||
ec65fea5 | 3356 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3357 | { |
f8748881 | 3358 | const char __user *fname; |
15b71abe | 3359 | int ret; |
b7bb4f7d | 3360 | |
3232dd02 | 3361 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3362 | return -EINVAL; |
ec65fea5 | 3363 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3364 | return -EINVAL; |
ec65fea5 | 3365 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3366 | return -EBADF; |
03b1230c | 3367 | |
ec65fea5 PB |
3368 | /* open.how should be already initialised */ |
3369 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3370 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3371 | |
25e72d10 PB |
3372 | req->open.dfd = READ_ONCE(sqe->fd); |
3373 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3374 | req->open.filename = getname(fname); |
15b71abe JA |
3375 | if (IS_ERR(req->open.filename)) { |
3376 | ret = PTR_ERR(req->open.filename); | |
3377 | req->open.filename = NULL; | |
3378 | return ret; | |
3379 | } | |
4022e7af | 3380 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3381 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3382 | return 0; |
03b1230c JA |
3383 | } |
3384 | ||
ec65fea5 PB |
3385 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3386 | { | |
3387 | u64 flags, mode; | |
3388 | ||
3389 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3390 | return 0; | |
3391 | mode = READ_ONCE(sqe->len); | |
3392 | flags = READ_ONCE(sqe->open_flags); | |
3393 | req->open.how = build_open_how(flags, mode); | |
3394 | return __io_openat_prep(req, sqe); | |
3395 | } | |
3396 | ||
cebdb986 | 3397 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3398 | { |
cebdb986 | 3399 | struct open_how __user *how; |
cebdb986 | 3400 | size_t len; |
0fa03c62 JA |
3401 | int ret; |
3402 | ||
0bdbdd08 PB |
3403 | if (req->flags & REQ_F_NEED_CLEANUP) |
3404 | return 0; | |
cebdb986 JA |
3405 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3406 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3407 | if (len < OPEN_HOW_SIZE_VER0) |
3408 | return -EINVAL; | |
3529d8c2 | 3409 | |
cebdb986 JA |
3410 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3411 | len); | |
3412 | if (ret) | |
3413 | return ret; | |
3529d8c2 | 3414 | |
ec65fea5 | 3415 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3416 | } |
3417 | ||
014db007 | 3418 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3419 | { |
3420 | struct open_flags op; | |
15b71abe JA |
3421 | struct file *file; |
3422 | int ret; | |
3423 | ||
f86cd20c | 3424 | if (force_nonblock) |
15b71abe | 3425 | return -EAGAIN; |
15b71abe | 3426 | |
cebdb986 | 3427 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3428 | if (ret) |
3429 | goto err; | |
3430 | ||
4022e7af | 3431 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3432 | if (ret < 0) |
3433 | goto err; | |
3434 | ||
3435 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3436 | if (IS_ERR(file)) { | |
3437 | put_unused_fd(ret); | |
3438 | ret = PTR_ERR(file); | |
3439 | } else { | |
3440 | fsnotify_open(file); | |
3441 | fd_install(ret, file); | |
3442 | } | |
3443 | err: | |
3444 | putname(req->open.filename); | |
8fef80bf | 3445 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3446 | if (ret < 0) |
3447 | req_set_fail_links(req); | |
e1e16097 | 3448 | io_req_complete(req, ret); |
15b71abe JA |
3449 | return 0; |
3450 | } | |
3451 | ||
014db007 | 3452 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3453 | { |
014db007 | 3454 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3455 | } |
3456 | ||
067524e9 JA |
3457 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3458 | const struct io_uring_sqe *sqe) | |
3459 | { | |
3460 | struct io_provide_buf *p = &req->pbuf; | |
3461 | u64 tmp; | |
3462 | ||
3463 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3464 | return -EINVAL; | |
3465 | ||
3466 | tmp = READ_ONCE(sqe->fd); | |
3467 | if (!tmp || tmp > USHRT_MAX) | |
3468 | return -EINVAL; | |
3469 | ||
3470 | memset(p, 0, sizeof(*p)); | |
3471 | p->nbufs = tmp; | |
3472 | p->bgid = READ_ONCE(sqe->buf_group); | |
3473 | return 0; | |
3474 | } | |
3475 | ||
3476 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3477 | int bgid, unsigned nbufs) | |
3478 | { | |
3479 | unsigned i = 0; | |
3480 | ||
3481 | /* shouldn't happen */ | |
3482 | if (!nbufs) | |
3483 | return 0; | |
3484 | ||
3485 | /* the head kbuf is the list itself */ | |
3486 | while (!list_empty(&buf->list)) { | |
3487 | struct io_buffer *nxt; | |
3488 | ||
3489 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3490 | list_del(&nxt->list); | |
3491 | kfree(nxt); | |
3492 | if (++i == nbufs) | |
3493 | return i; | |
3494 | } | |
3495 | i++; | |
3496 | kfree(buf); | |
3497 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3498 | ||
3499 | return i; | |
3500 | } | |
3501 | ||
229a7b63 JA |
3502 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3503 | struct io_comp_state *cs) | |
067524e9 JA |
3504 | { |
3505 | struct io_provide_buf *p = &req->pbuf; | |
3506 | struct io_ring_ctx *ctx = req->ctx; | |
3507 | struct io_buffer *head; | |
3508 | int ret = 0; | |
3509 | ||
3510 | io_ring_submit_lock(ctx, !force_nonblock); | |
3511 | ||
3512 | lockdep_assert_held(&ctx->uring_lock); | |
3513 | ||
3514 | ret = -ENOENT; | |
3515 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3516 | if (head) | |
3517 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3518 | ||
3519 | io_ring_submit_lock(ctx, !force_nonblock); | |
3520 | if (ret < 0) | |
3521 | req_set_fail_links(req); | |
229a7b63 | 3522 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3523 | return 0; |
3524 | } | |
3525 | ||
ddf0322d JA |
3526 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3527 | const struct io_uring_sqe *sqe) | |
3528 | { | |
3529 | struct io_provide_buf *p = &req->pbuf; | |
3530 | u64 tmp; | |
3531 | ||
3532 | if (sqe->ioprio || sqe->rw_flags) | |
3533 | return -EINVAL; | |
3534 | ||
3535 | tmp = READ_ONCE(sqe->fd); | |
3536 | if (!tmp || tmp > USHRT_MAX) | |
3537 | return -E2BIG; | |
3538 | p->nbufs = tmp; | |
3539 | p->addr = READ_ONCE(sqe->addr); | |
3540 | p->len = READ_ONCE(sqe->len); | |
3541 | ||
efe68c1c | 3542 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3543 | return -EFAULT; |
3544 | ||
3545 | p->bgid = READ_ONCE(sqe->buf_group); | |
3546 | tmp = READ_ONCE(sqe->off); | |
3547 | if (tmp > USHRT_MAX) | |
3548 | return -E2BIG; | |
3549 | p->bid = tmp; | |
3550 | return 0; | |
3551 | } | |
3552 | ||
3553 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3554 | { | |
3555 | struct io_buffer *buf; | |
3556 | u64 addr = pbuf->addr; | |
3557 | int i, bid = pbuf->bid; | |
3558 | ||
3559 | for (i = 0; i < pbuf->nbufs; i++) { | |
3560 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3561 | if (!buf) | |
3562 | break; | |
3563 | ||
3564 | buf->addr = addr; | |
3565 | buf->len = pbuf->len; | |
3566 | buf->bid = bid; | |
3567 | addr += pbuf->len; | |
3568 | bid++; | |
3569 | if (!*head) { | |
3570 | INIT_LIST_HEAD(&buf->list); | |
3571 | *head = buf; | |
3572 | } else { | |
3573 | list_add_tail(&buf->list, &(*head)->list); | |
3574 | } | |
3575 | } | |
3576 | ||
3577 | return i ? i : -ENOMEM; | |
3578 | } | |
3579 | ||
229a7b63 JA |
3580 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3581 | struct io_comp_state *cs) | |
ddf0322d JA |
3582 | { |
3583 | struct io_provide_buf *p = &req->pbuf; | |
3584 | struct io_ring_ctx *ctx = req->ctx; | |
3585 | struct io_buffer *head, *list; | |
3586 | int ret = 0; | |
3587 | ||
3588 | io_ring_submit_lock(ctx, !force_nonblock); | |
3589 | ||
3590 | lockdep_assert_held(&ctx->uring_lock); | |
3591 | ||
3592 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3593 | ||
3594 | ret = io_add_buffers(p, &head); | |
3595 | if (ret < 0) | |
3596 | goto out; | |
3597 | ||
3598 | if (!list) { | |
3599 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3600 | GFP_KERNEL); | |
3601 | if (ret < 0) { | |
067524e9 | 3602 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3603 | goto out; |
3604 | } | |
3605 | } | |
3606 | out: | |
3607 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3608 | if (ret < 0) | |
3609 | req_set_fail_links(req); | |
229a7b63 | 3610 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3611 | return 0; |
cebdb986 JA |
3612 | } |
3613 | ||
3e4827b0 JA |
3614 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3615 | const struct io_uring_sqe *sqe) | |
3616 | { | |
3617 | #if defined(CONFIG_EPOLL) | |
3618 | if (sqe->ioprio || sqe->buf_index) | |
3619 | return -EINVAL; | |
3232dd02 PB |
3620 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3621 | return -EINVAL; | |
3e4827b0 JA |
3622 | |
3623 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3624 | req->epoll.op = READ_ONCE(sqe->len); | |
3625 | req->epoll.fd = READ_ONCE(sqe->off); | |
3626 | ||
3627 | if (ep_op_has_event(req->epoll.op)) { | |
3628 | struct epoll_event __user *ev; | |
3629 | ||
3630 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3631 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3632 | return -EFAULT; | |
3633 | } | |
3634 | ||
3635 | return 0; | |
3636 | #else | |
3637 | return -EOPNOTSUPP; | |
3638 | #endif | |
3639 | } | |
3640 | ||
229a7b63 JA |
3641 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3642 | struct io_comp_state *cs) | |
3e4827b0 JA |
3643 | { |
3644 | #if defined(CONFIG_EPOLL) | |
3645 | struct io_epoll *ie = &req->epoll; | |
3646 | int ret; | |
3647 | ||
3648 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3649 | if (force_nonblock && ret == -EAGAIN) | |
3650 | return -EAGAIN; | |
3651 | ||
3652 | if (ret < 0) | |
3653 | req_set_fail_links(req); | |
229a7b63 | 3654 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3655 | return 0; |
3656 | #else | |
3657 | return -EOPNOTSUPP; | |
3658 | #endif | |
3659 | } | |
3660 | ||
c1ca757b JA |
3661 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3662 | { | |
3663 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3664 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3665 | return -EINVAL; | |
3232dd02 PB |
3666 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3667 | return -EINVAL; | |
c1ca757b JA |
3668 | |
3669 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3670 | req->madvise.len = READ_ONCE(sqe->len); | |
3671 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3672 | return 0; | |
3673 | #else | |
3674 | return -EOPNOTSUPP; | |
3675 | #endif | |
3676 | } | |
3677 | ||
014db007 | 3678 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3679 | { |
3680 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3681 | struct io_madvise *ma = &req->madvise; | |
3682 | int ret; | |
3683 | ||
3684 | if (force_nonblock) | |
3685 | return -EAGAIN; | |
3686 | ||
3687 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3688 | if (ret < 0) | |
3689 | req_set_fail_links(req); | |
e1e16097 | 3690 | io_req_complete(req, ret); |
c1ca757b JA |
3691 | return 0; |
3692 | #else | |
3693 | return -EOPNOTSUPP; | |
3694 | #endif | |
3695 | } | |
3696 | ||
4840e418 JA |
3697 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3698 | { | |
3699 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3700 | return -EINVAL; | |
3232dd02 PB |
3701 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3702 | return -EINVAL; | |
4840e418 JA |
3703 | |
3704 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3705 | req->fadvise.len = READ_ONCE(sqe->len); | |
3706 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3707 | return 0; | |
3708 | } | |
3709 | ||
014db007 | 3710 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3711 | { |
3712 | struct io_fadvise *fa = &req->fadvise; | |
3713 | int ret; | |
3714 | ||
3e69426d JA |
3715 | if (force_nonblock) { |
3716 | switch (fa->advice) { | |
3717 | case POSIX_FADV_NORMAL: | |
3718 | case POSIX_FADV_RANDOM: | |
3719 | case POSIX_FADV_SEQUENTIAL: | |
3720 | break; | |
3721 | default: | |
3722 | return -EAGAIN; | |
3723 | } | |
3724 | } | |
4840e418 JA |
3725 | |
3726 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3727 | if (ret < 0) | |
3728 | req_set_fail_links(req); | |
e1e16097 | 3729 | io_req_complete(req, ret); |
4840e418 JA |
3730 | return 0; |
3731 | } | |
3732 | ||
eddc7ef5 JA |
3733 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3734 | { | |
3232dd02 PB |
3735 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3736 | return -EINVAL; | |
eddc7ef5 JA |
3737 | if (sqe->ioprio || sqe->buf_index) |
3738 | return -EINVAL; | |
9c280f90 | 3739 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3740 | return -EBADF; |
eddc7ef5 | 3741 | |
1d9e1288 BM |
3742 | req->statx.dfd = READ_ONCE(sqe->fd); |
3743 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3744 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3745 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3746 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3747 | |
3748 | return 0; | |
3749 | } | |
3750 | ||
014db007 | 3751 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3752 | { |
1d9e1288 | 3753 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3754 | int ret; |
3755 | ||
5b0bbee4 JA |
3756 | if (force_nonblock) { |
3757 | /* only need file table for an actual valid fd */ | |
3758 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3759 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3760 | return -EAGAIN; |
5b0bbee4 | 3761 | } |
eddc7ef5 | 3762 | |
e62753e4 BM |
3763 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3764 | ctx->buffer); | |
eddc7ef5 | 3765 | |
eddc7ef5 JA |
3766 | if (ret < 0) |
3767 | req_set_fail_links(req); | |
e1e16097 | 3768 | io_req_complete(req, ret); |
eddc7ef5 JA |
3769 | return 0; |
3770 | } | |
3771 | ||
b5dba59e JA |
3772 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3773 | { | |
3774 | /* | |
3775 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3776 | * leave the 'file' in an undeterminate state, and here need to modify |
3777 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3778 | */ |
7cdaf587 | 3779 | io_req_init_async(req); |
b5dba59e JA |
3780 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3781 | ||
3232dd02 PB |
3782 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3783 | return -EINVAL; | |
b5dba59e JA |
3784 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3785 | sqe->rw_flags || sqe->buf_index) | |
3786 | return -EINVAL; | |
9c280f90 | 3787 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3788 | return -EBADF; |
b5dba59e JA |
3789 | |
3790 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3791 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3792 | req->close.fd == req->ctx->ring_fd) | |
3793 | return -EBADF; | |
b5dba59e | 3794 | |
3af73b28 | 3795 | req->close.put_file = NULL; |
b5dba59e | 3796 | return 0; |
b5dba59e JA |
3797 | } |
3798 | ||
229a7b63 JA |
3799 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
3800 | struct io_comp_state *cs) | |
b5dba59e | 3801 | { |
3af73b28 | 3802 | struct io_close *close = &req->close; |
b5dba59e JA |
3803 | int ret; |
3804 | ||
3af73b28 PB |
3805 | /* might be already done during nonblock submission */ |
3806 | if (!close->put_file) { | |
3807 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3808 | if (ret < 0) | |
3809 | return (ret == -ENOENT) ? -EBADF : ret; | |
3810 | } | |
b5dba59e JA |
3811 | |
3812 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3813 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
3814 | /* was never set, but play safe */ |
3815 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 3816 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 3817 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 3818 | return -EAGAIN; |
a2100672 | 3819 | } |
b5dba59e | 3820 | |
3af73b28 PB |
3821 | /* No ->flush() or already async, safely close from here */ |
3822 | ret = filp_close(close->put_file, req->work.files); | |
3823 | if (ret < 0) | |
3824 | req_set_fail_links(req); | |
3af73b28 PB |
3825 | fput(close->put_file); |
3826 | close->put_file = NULL; | |
229a7b63 | 3827 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 3828 | return 0; |
b5dba59e JA |
3829 | } |
3830 | ||
3529d8c2 | 3831 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3832 | { |
3833 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3834 | |
3835 | if (!req->file) | |
3836 | return -EBADF; | |
5d17b4a4 JA |
3837 | |
3838 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3839 | return -EINVAL; | |
3840 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3841 | return -EINVAL; | |
3842 | ||
8ed8d3c3 JA |
3843 | req->sync.off = READ_ONCE(sqe->off); |
3844 | req->sync.len = READ_ONCE(sqe->len); | |
3845 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3846 | return 0; |
3847 | } | |
3848 | ||
ac45abc0 | 3849 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3850 | { |
8ed8d3c3 JA |
3851 | int ret; |
3852 | ||
ac45abc0 PB |
3853 | /* sync_file_range always requires a blocking context */ |
3854 | if (force_nonblock) | |
3855 | return -EAGAIN; | |
3856 | ||
9adbd45d | 3857 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3858 | req->sync.flags); |
3859 | if (ret < 0) | |
3860 | req_set_fail_links(req); | |
e1e16097 | 3861 | io_req_complete(req, ret); |
5d17b4a4 JA |
3862 | return 0; |
3863 | } | |
3864 | ||
469956e8 | 3865 | #if defined(CONFIG_NET) |
02d27d89 PB |
3866 | static int io_setup_async_msg(struct io_kiocb *req, |
3867 | struct io_async_msghdr *kmsg) | |
3868 | { | |
3869 | if (req->io) | |
3870 | return -EAGAIN; | |
3871 | if (io_alloc_async_ctx(req)) { | |
3872 | if (kmsg->iov != kmsg->fast_iov) | |
3873 | kfree(kmsg->iov); | |
3874 | return -ENOMEM; | |
3875 | } | |
3876 | req->flags |= REQ_F_NEED_CLEANUP; | |
3877 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3878 | return -EAGAIN; | |
3879 | } | |
3880 | ||
2ae523ed PB |
3881 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
3882 | struct io_async_msghdr *iomsg) | |
3883 | { | |
3884 | iomsg->iov = iomsg->fast_iov; | |
3885 | iomsg->msg.msg_name = &iomsg->addr; | |
3886 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
3887 | req->sr_msg.msg_flags, &iomsg->iov); | |
3888 | } | |
3889 | ||
3529d8c2 | 3890 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3891 | { |
e47293fd | 3892 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3893 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3894 | int ret; |
03b1230c | 3895 | |
d2b6f48b PB |
3896 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3897 | return -EINVAL; | |
3898 | ||
e47293fd | 3899 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 3900 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 3901 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3902 | |
d8768362 JA |
3903 | #ifdef CONFIG_COMPAT |
3904 | if (req->ctx->compat) | |
3905 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3906 | #endif | |
3907 | ||
fddaface | 3908 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3909 | return 0; |
5f798bea PB |
3910 | /* iovec is already imported */ |
3911 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3912 | return 0; | |
3529d8c2 | 3913 | |
2ae523ed | 3914 | ret = io_sendmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
3915 | if (!ret) |
3916 | req->flags |= REQ_F_NEED_CLEANUP; | |
3917 | return ret; | |
03b1230c JA |
3918 | } |
3919 | ||
229a7b63 JA |
3920 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
3921 | struct io_comp_state *cs) | |
aa1fa28f | 3922 | { |
0b416c3e | 3923 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3924 | struct socket *sock; |
3925 | int ret; | |
3926 | ||
0fa03c62 JA |
3927 | sock = sock_from_file(req->file, &ret); |
3928 | if (sock) { | |
1400e697 | 3929 | struct io_async_msghdr iomsg; |
0fa03c62 JA |
3930 | unsigned flags; |
3931 | ||
03b1230c | 3932 | if (req->io) { |
0b416c3e | 3933 | kmsg = &req->io->msg; |
b537916c | 3934 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3935 | /* if iov is set, it's allocated already */ |
3936 | if (!kmsg->iov) | |
3937 | kmsg->iov = kmsg->fast_iov; | |
3938 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3939 | } else { |
2ae523ed | 3940 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
03b1230c | 3941 | if (ret) |
3529d8c2 | 3942 | return ret; |
1400e697 | 3943 | kmsg = &iomsg; |
03b1230c | 3944 | } |
0fa03c62 | 3945 | |
e47293fd JA |
3946 | flags = req->sr_msg.msg_flags; |
3947 | if (flags & MSG_DONTWAIT) | |
3948 | req->flags |= REQ_F_NOWAIT; | |
3949 | else if (force_nonblock) | |
3950 | flags |= MSG_DONTWAIT; | |
3951 | ||
0b416c3e | 3952 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3953 | if (force_nonblock && ret == -EAGAIN) |
3954 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3955 | if (ret == -ERESTARTSYS) |
3956 | ret = -EINTR; | |
0fa03c62 JA |
3957 | } |
3958 | ||
1e95081c | 3959 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3960 | kfree(kmsg->iov); |
99bc4c38 | 3961 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
3962 | if (ret < 0) |
3963 | req_set_fail_links(req); | |
229a7b63 | 3964 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 3965 | return 0; |
03b1230c | 3966 | } |
aa1fa28f | 3967 | |
229a7b63 JA |
3968 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
3969 | struct io_comp_state *cs) | |
fddaface | 3970 | { |
fddaface JA |
3971 | struct socket *sock; |
3972 | int ret; | |
3973 | ||
fddaface JA |
3974 | sock = sock_from_file(req->file, &ret); |
3975 | if (sock) { | |
3976 | struct io_sr_msg *sr = &req->sr_msg; | |
3977 | struct msghdr msg; | |
3978 | struct iovec iov; | |
3979 | unsigned flags; | |
3980 | ||
3981 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3982 | &msg.msg_iter); | |
3983 | if (ret) | |
3984 | return ret; | |
3985 | ||
3986 | msg.msg_name = NULL; | |
3987 | msg.msg_control = NULL; | |
3988 | msg.msg_controllen = 0; | |
3989 | msg.msg_namelen = 0; | |
3990 | ||
3991 | flags = req->sr_msg.msg_flags; | |
3992 | if (flags & MSG_DONTWAIT) | |
3993 | req->flags |= REQ_F_NOWAIT; | |
3994 | else if (force_nonblock) | |
3995 | flags |= MSG_DONTWAIT; | |
3996 | ||
0b7b21e4 JA |
3997 | msg.msg_flags = flags; |
3998 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3999 | if (force_nonblock && ret == -EAGAIN) |
4000 | return -EAGAIN; | |
4001 | if (ret == -ERESTARTSYS) | |
4002 | ret = -EINTR; | |
4003 | } | |
4004 | ||
fddaface JA |
4005 | if (ret < 0) |
4006 | req_set_fail_links(req); | |
229a7b63 | 4007 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4008 | return 0; |
fddaface JA |
4009 | } |
4010 | ||
1400e697 PB |
4011 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4012 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4013 | { |
4014 | struct io_sr_msg *sr = &req->sr_msg; | |
4015 | struct iovec __user *uiov; | |
4016 | size_t iov_len; | |
4017 | int ret; | |
4018 | ||
1400e697 PB |
4019 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4020 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4021 | if (ret) |
4022 | return ret; | |
4023 | ||
4024 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4025 | if (iov_len > 1) | |
4026 | return -EINVAL; | |
1400e697 | 4027 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4028 | return -EFAULT; |
1400e697 PB |
4029 | sr->len = iomsg->iov[0].iov_len; |
4030 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4031 | sr->len); |
1400e697 | 4032 | iomsg->iov = NULL; |
52de1fe1 JA |
4033 | } else { |
4034 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
1400e697 | 4035 | &iomsg->iov, &iomsg->msg.msg_iter); |
52de1fe1 JA |
4036 | if (ret > 0) |
4037 | ret = 0; | |
4038 | } | |
4039 | ||
4040 | return ret; | |
4041 | } | |
4042 | ||
4043 | #ifdef CONFIG_COMPAT | |
4044 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4045 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4046 | { |
4047 | struct compat_msghdr __user *msg_compat; | |
4048 | struct io_sr_msg *sr = &req->sr_msg; | |
4049 | struct compat_iovec __user *uiov; | |
4050 | compat_uptr_t ptr; | |
4051 | compat_size_t len; | |
4052 | int ret; | |
4053 | ||
270a5940 | 4054 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4055 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4056 | &ptr, &len); |
4057 | if (ret) | |
4058 | return ret; | |
4059 | ||
4060 | uiov = compat_ptr(ptr); | |
4061 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4062 | compat_ssize_t clen; | |
4063 | ||
4064 | if (len > 1) | |
4065 | return -EINVAL; | |
4066 | if (!access_ok(uiov, sizeof(*uiov))) | |
4067 | return -EFAULT; | |
4068 | if (__get_user(clen, &uiov->iov_len)) | |
4069 | return -EFAULT; | |
4070 | if (clen < 0) | |
4071 | return -EINVAL; | |
1400e697 PB |
4072 | sr->len = iomsg->iov[0].iov_len; |
4073 | iomsg->iov = NULL; | |
52de1fe1 JA |
4074 | } else { |
4075 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
1400e697 PB |
4076 | &iomsg->iov, |
4077 | &iomsg->msg.msg_iter); | |
52de1fe1 JA |
4078 | if (ret < 0) |
4079 | return ret; | |
4080 | } | |
4081 | ||
4082 | return 0; | |
4083 | } | |
4084 | #endif | |
4085 | ||
1400e697 PB |
4086 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4087 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4088 | { |
1400e697 PB |
4089 | iomsg->msg.msg_name = &iomsg->addr; |
4090 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4091 | |
4092 | #ifdef CONFIG_COMPAT | |
4093 | if (req->ctx->compat) | |
1400e697 | 4094 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4095 | #endif |
52de1fe1 | 4096 | |
1400e697 | 4097 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4098 | } |
4099 | ||
bcda7baa JA |
4100 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
4101 | int *cflags, bool needs_lock) | |
4102 | { | |
4103 | struct io_sr_msg *sr = &req->sr_msg; | |
4104 | struct io_buffer *kbuf; | |
4105 | ||
4106 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
4107 | return NULL; | |
4108 | ||
4109 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
4110 | if (IS_ERR(kbuf)) | |
4111 | return kbuf; | |
4112 | ||
4113 | sr->kbuf = kbuf; | |
4114 | req->flags |= REQ_F_BUFFER_SELECTED; | |
4115 | ||
4116 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
4117 | *cflags |= IORING_CQE_F_BUFFER; | |
4118 | return kbuf; | |
fddaface JA |
4119 | } |
4120 | ||
3529d8c2 JA |
4121 | static int io_recvmsg_prep(struct io_kiocb *req, |
4122 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4123 | { |
e47293fd | 4124 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4125 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4126 | int ret; |
3529d8c2 | 4127 | |
d2b6f48b PB |
4128 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4129 | return -EINVAL; | |
4130 | ||
3529d8c2 | 4131 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4132 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4133 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4134 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4135 | |
d8768362 JA |
4136 | #ifdef CONFIG_COMPAT |
4137 | if (req->ctx->compat) | |
4138 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4139 | #endif | |
4140 | ||
fddaface | 4141 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4142 | return 0; |
5f798bea PB |
4143 | /* iovec is already imported */ |
4144 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4145 | return 0; | |
03b1230c | 4146 | |
1400e697 | 4147 | ret = io_recvmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4148 | if (!ret) |
4149 | req->flags |= REQ_F_NEED_CLEANUP; | |
4150 | return ret; | |
aa1fa28f JA |
4151 | } |
4152 | ||
229a7b63 JA |
4153 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4154 | struct io_comp_state *cs) | |
aa1fa28f | 4155 | { |
0b416c3e | 4156 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 4157 | struct socket *sock; |
52de1fe1 | 4158 | int ret, cflags = 0; |
03b1230c | 4159 | |
03b1230c JA |
4160 | sock = sock_from_file(req->file, &ret); |
4161 | if (sock) { | |
52de1fe1 | 4162 | struct io_buffer *kbuf; |
1400e697 | 4163 | struct io_async_msghdr iomsg; |
03b1230c JA |
4164 | unsigned flags; |
4165 | ||
03b1230c | 4166 | if (req->io) { |
0b416c3e | 4167 | kmsg = &req->io->msg; |
b537916c | 4168 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
4169 | /* if iov is set, it's allocated already */ |
4170 | if (!kmsg->iov) | |
4171 | kmsg->iov = kmsg->fast_iov; | |
4172 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 4173 | } else { |
1400e697 | 4174 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
03b1230c | 4175 | if (ret) |
3529d8c2 | 4176 | return ret; |
1400e697 | 4177 | kmsg = &iomsg; |
03b1230c JA |
4178 | } |
4179 | ||
52de1fe1 JA |
4180 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
4181 | if (IS_ERR(kbuf)) { | |
4182 | return PTR_ERR(kbuf); | |
4183 | } else if (kbuf) { | |
4184 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
4185 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4186 | 1, req->sr_msg.len); | |
4187 | } | |
4188 | ||
e47293fd JA |
4189 | flags = req->sr_msg.msg_flags; |
4190 | if (flags & MSG_DONTWAIT) | |
4191 | req->flags |= REQ_F_NOWAIT; | |
4192 | else if (force_nonblock) | |
4193 | flags |= MSG_DONTWAIT; | |
4194 | ||
270a5940 | 4195 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
e47293fd | 4196 | kmsg->uaddr, flags); |
681fda8d PB |
4197 | if (force_nonblock && ret == -EAGAIN) { |
4198 | ret = io_setup_async_msg(req, kmsg); | |
4199 | if (ret != -EAGAIN) | |
4200 | kfree(kbuf); | |
4201 | return ret; | |
4202 | } | |
03b1230c JA |
4203 | if (ret == -ERESTARTSYS) |
4204 | ret = -EINTR; | |
681fda8d PB |
4205 | if (kbuf) |
4206 | kfree(kbuf); | |
03b1230c JA |
4207 | } |
4208 | ||
1e95081c | 4209 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4210 | kfree(kmsg->iov); |
99bc4c38 | 4211 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4212 | if (ret < 0) |
4213 | req_set_fail_links(req); | |
229a7b63 | 4214 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4215 | return 0; |
0fa03c62 | 4216 | } |
5d17b4a4 | 4217 | |
229a7b63 JA |
4218 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4219 | struct io_comp_state *cs) | |
fddaface | 4220 | { |
bcda7baa | 4221 | struct io_buffer *kbuf = NULL; |
fddaface | 4222 | struct socket *sock; |
bcda7baa | 4223 | int ret, cflags = 0; |
fddaface | 4224 | |
fddaface JA |
4225 | sock = sock_from_file(req->file, &ret); |
4226 | if (sock) { | |
4227 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 4228 | void __user *buf = sr->buf; |
fddaface JA |
4229 | struct msghdr msg; |
4230 | struct iovec iov; | |
4231 | unsigned flags; | |
4232 | ||
bcda7baa JA |
4233 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
4234 | if (IS_ERR(kbuf)) | |
4235 | return PTR_ERR(kbuf); | |
4236 | else if (kbuf) | |
4237 | buf = u64_to_user_ptr(kbuf->addr); | |
4238 | ||
4239 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 4240 | &msg.msg_iter); |
bcda7baa JA |
4241 | if (ret) { |
4242 | kfree(kbuf); | |
fddaface | 4243 | return ret; |
bcda7baa | 4244 | } |
fddaface | 4245 | |
bcda7baa | 4246 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
4247 | msg.msg_name = NULL; |
4248 | msg.msg_control = NULL; | |
4249 | msg.msg_controllen = 0; | |
4250 | msg.msg_namelen = 0; | |
4251 | msg.msg_iocb = NULL; | |
4252 | msg.msg_flags = 0; | |
4253 | ||
4254 | flags = req->sr_msg.msg_flags; | |
4255 | if (flags & MSG_DONTWAIT) | |
4256 | req->flags |= REQ_F_NOWAIT; | |
4257 | else if (force_nonblock) | |
4258 | flags |= MSG_DONTWAIT; | |
4259 | ||
0b7b21e4 | 4260 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
4261 | if (force_nonblock && ret == -EAGAIN) |
4262 | return -EAGAIN; | |
4263 | if (ret == -ERESTARTSYS) | |
4264 | ret = -EINTR; | |
4265 | } | |
4266 | ||
bcda7baa JA |
4267 | kfree(kbuf); |
4268 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
fddaface JA |
4269 | if (ret < 0) |
4270 | req_set_fail_links(req); | |
229a7b63 | 4271 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4272 | return 0; |
fddaface JA |
4273 | } |
4274 | ||
3529d8c2 | 4275 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4276 | { |
8ed8d3c3 JA |
4277 | struct io_accept *accept = &req->accept; |
4278 | ||
17f2fe35 JA |
4279 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4280 | return -EINVAL; | |
8042d6ce | 4281 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4282 | return -EINVAL; |
4283 | ||
d55e5f5b JA |
4284 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4285 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4286 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4287 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4288 | return 0; |
8ed8d3c3 | 4289 | } |
17f2fe35 | 4290 | |
229a7b63 JA |
4291 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4292 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4293 | { |
4294 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4295 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4296 | int ret; |
4297 | ||
e697deed JX |
4298 | if (req->file->f_flags & O_NONBLOCK) |
4299 | req->flags |= REQ_F_NOWAIT; | |
4300 | ||
8ed8d3c3 | 4301 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4302 | accept->addr_len, accept->flags, |
4303 | accept->nofile); | |
8ed8d3c3 | 4304 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4305 | return -EAGAIN; |
ac45abc0 PB |
4306 | if (ret < 0) { |
4307 | if (ret == -ERESTARTSYS) | |
4308 | ret = -EINTR; | |
4e88d6e7 | 4309 | req_set_fail_links(req); |
ac45abc0 | 4310 | } |
229a7b63 | 4311 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4312 | return 0; |
8ed8d3c3 JA |
4313 | } |
4314 | ||
3529d8c2 | 4315 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4316 | { |
3529d8c2 JA |
4317 | struct io_connect *conn = &req->connect; |
4318 | struct io_async_ctx *io = req->io; | |
f499a021 | 4319 | |
3fbb51c1 JA |
4320 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4321 | return -EINVAL; | |
4322 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4323 | return -EINVAL; | |
4324 | ||
3529d8c2 JA |
4325 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4326 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4327 | ||
4328 | if (!io) | |
4329 | return 0; | |
4330 | ||
4331 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4332 | &io->connect.address); |
f499a021 JA |
4333 | } |
4334 | ||
229a7b63 JA |
4335 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4336 | struct io_comp_state *cs) | |
f8e85cf2 | 4337 | { |
f499a021 | 4338 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4339 | unsigned file_flags; |
3fbb51c1 | 4340 | int ret; |
f8e85cf2 | 4341 | |
f499a021 JA |
4342 | if (req->io) { |
4343 | io = req->io; | |
4344 | } else { | |
3529d8c2 JA |
4345 | ret = move_addr_to_kernel(req->connect.addr, |
4346 | req->connect.addr_len, | |
4347 | &__io.connect.address); | |
f499a021 JA |
4348 | if (ret) |
4349 | goto out; | |
4350 | io = &__io; | |
4351 | } | |
4352 | ||
3fbb51c1 JA |
4353 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4354 | ||
4355 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4356 | req->connect.addr_len, file_flags); | |
87f80d62 | 4357 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4358 | if (req->io) |
4359 | return -EAGAIN; | |
4360 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4361 | ret = -ENOMEM; |
4362 | goto out; | |
4363 | } | |
b7bb4f7d | 4364 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4365 | return -EAGAIN; |
f499a021 | 4366 | } |
f8e85cf2 JA |
4367 | if (ret == -ERESTARTSYS) |
4368 | ret = -EINTR; | |
f499a021 | 4369 | out: |
4e88d6e7 JA |
4370 | if (ret < 0) |
4371 | req_set_fail_links(req); | |
229a7b63 | 4372 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4373 | return 0; |
469956e8 Y |
4374 | } |
4375 | #else /* !CONFIG_NET */ | |
4376 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4377 | { | |
f8e85cf2 | 4378 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4379 | } |
4380 | ||
1e16c2f9 RD |
4381 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4382 | struct io_comp_state *cs) | |
469956e8 Y |
4383 | { |
4384 | return -EOPNOTSUPP; | |
4385 | } | |
4386 | ||
1e16c2f9 RD |
4387 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4388 | struct io_comp_state *cs) | |
469956e8 Y |
4389 | { |
4390 | return -EOPNOTSUPP; | |
4391 | } | |
4392 | ||
4393 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4394 | const struct io_uring_sqe *sqe) | |
4395 | { | |
4396 | return -EOPNOTSUPP; | |
4397 | } | |
4398 | ||
1e16c2f9 RD |
4399 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4400 | struct io_comp_state *cs) | |
469956e8 Y |
4401 | { |
4402 | return -EOPNOTSUPP; | |
4403 | } | |
4404 | ||
1e16c2f9 RD |
4405 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4406 | struct io_comp_state *cs) | |
469956e8 Y |
4407 | { |
4408 | return -EOPNOTSUPP; | |
4409 | } | |
4410 | ||
4411 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4412 | { | |
4413 | return -EOPNOTSUPP; | |
4414 | } | |
4415 | ||
1e16c2f9 RD |
4416 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4417 | struct io_comp_state *cs) | |
469956e8 Y |
4418 | { |
4419 | return -EOPNOTSUPP; | |
4420 | } | |
4421 | ||
4422 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4423 | { | |
4424 | return -EOPNOTSUPP; | |
4425 | } | |
4426 | ||
1e16c2f9 RD |
4427 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4428 | struct io_comp_state *cs) | |
469956e8 | 4429 | { |
f8e85cf2 | 4430 | return -EOPNOTSUPP; |
f8e85cf2 | 4431 | } |
469956e8 | 4432 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4433 | |
d7718a9d JA |
4434 | struct io_poll_table { |
4435 | struct poll_table_struct pt; | |
4436 | struct io_kiocb *req; | |
4437 | int error; | |
4438 | }; | |
4439 | ||
d7718a9d JA |
4440 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4441 | __poll_t mask, task_work_func_t func) | |
4442 | { | |
aa96bf8a | 4443 | int ret; |
d7718a9d JA |
4444 | |
4445 | /* for instances that support it check for an event match first: */ | |
4446 | if (mask && !(mask & poll->events)) | |
4447 | return 0; | |
4448 | ||
4449 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4450 | ||
4451 | list_del_init(&poll->wait.entry); | |
4452 | ||
d7718a9d JA |
4453 | req->result = mask; |
4454 | init_task_work(&req->task_work, func); | |
4455 | /* | |
e3aabf95 JA |
4456 | * If this fails, then the task is exiting. When a task exits, the |
4457 | * work gets canceled, so just cancel this request as well instead | |
4458 | * of executing it. We can't safely execute it anyway, as we may not | |
4459 | * have the needed state needed for it anyway. | |
d7718a9d | 4460 | */ |
b7db41c9 | 4461 | ret = io_req_task_work_add(req, &req->task_work); |
aa96bf8a | 4462 | if (unlikely(ret)) { |
c2c4c83c JA |
4463 | struct task_struct *tsk; |
4464 | ||
e3aabf95 | 4465 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4466 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4467 | task_work_add(tsk, &req->task_work, 0); |
4468 | wake_up_process(tsk); | |
aa96bf8a | 4469 | } |
d7718a9d JA |
4470 | return 1; |
4471 | } | |
4472 | ||
74ce6ce4 JA |
4473 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4474 | __acquires(&req->ctx->completion_lock) | |
4475 | { | |
4476 | struct io_ring_ctx *ctx = req->ctx; | |
4477 | ||
4478 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4479 | struct poll_table_struct pt = { ._key = poll->events }; | |
4480 | ||
4481 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4482 | } | |
4483 | ||
4484 | spin_lock_irq(&ctx->completion_lock); | |
4485 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4486 | add_wait_queue(poll->head, &poll->wait); | |
4487 | return true; | |
4488 | } | |
4489 | ||
4490 | return false; | |
4491 | } | |
4492 | ||
807abcb0 | 4493 | static void io_poll_remove_double(struct io_kiocb *req, void *data) |
18bceab1 | 4494 | { |
807abcb0 | 4495 | struct io_poll_iocb *poll = data; |
18bceab1 JA |
4496 | |
4497 | lockdep_assert_held(&req->ctx->completion_lock); | |
4498 | ||
4499 | if (poll && poll->head) { | |
4500 | struct wait_queue_head *head = poll->head; | |
4501 | ||
4502 | spin_lock(&head->lock); | |
4503 | list_del_init(&poll->wait.entry); | |
4504 | if (poll->wait.private) | |
4505 | refcount_dec(&req->refs); | |
4506 | poll->head = NULL; | |
4507 | spin_unlock(&head->lock); | |
4508 | } | |
4509 | } | |
4510 | ||
4511 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4512 | { | |
4513 | struct io_ring_ctx *ctx = req->ctx; | |
4514 | ||
807abcb0 | 4515 | io_poll_remove_double(req, req->io); |
18bceab1 JA |
4516 | req->poll.done = true; |
4517 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4518 | io_commit_cqring(ctx); | |
4519 | } | |
4520 | ||
4521 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4522 | { | |
4523 | struct io_ring_ctx *ctx = req->ctx; | |
4524 | ||
4525 | if (io_poll_rewait(req, &req->poll)) { | |
4526 | spin_unlock_irq(&ctx->completion_lock); | |
4527 | return; | |
4528 | } | |
4529 | ||
4530 | hash_del(&req->hash_node); | |
4531 | io_poll_complete(req, req->result, 0); | |
4532 | req->flags |= REQ_F_COMP_LOCKED; | |
9b5f7bd9 | 4533 | *nxt = io_put_req_find_next(req); |
18bceab1 JA |
4534 | spin_unlock_irq(&ctx->completion_lock); |
4535 | ||
4536 | io_cqring_ev_posted(ctx); | |
4537 | } | |
4538 | ||
4539 | static void io_poll_task_func(struct callback_head *cb) | |
4540 | { | |
4541 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4542 | struct io_kiocb *nxt = NULL; | |
4543 | ||
4544 | io_poll_task_handler(req, &nxt); | |
ea1164e5 PB |
4545 | if (nxt) |
4546 | __io_req_task_submit(nxt); | |
18bceab1 JA |
4547 | } |
4548 | ||
4549 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4550 | int sync, void *key) | |
4551 | { | |
4552 | struct io_kiocb *req = wait->private; | |
807abcb0 | 4553 | struct io_poll_iocb *poll = req->apoll->double_poll; |
18bceab1 JA |
4554 | __poll_t mask = key_to_poll(key); |
4555 | ||
4556 | /* for instances that support it check for an event match first: */ | |
4557 | if (mask && !(mask & poll->events)) | |
4558 | return 0; | |
4559 | ||
807abcb0 | 4560 | if (poll && poll->head) { |
18bceab1 JA |
4561 | bool done; |
4562 | ||
807abcb0 JA |
4563 | spin_lock(&poll->head->lock); |
4564 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4565 | if (!done) |
807abcb0 JA |
4566 | list_del_init(&poll->wait.entry); |
4567 | spin_unlock(&poll->head->lock); | |
18bceab1 JA |
4568 | if (!done) |
4569 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4570 | } | |
4571 | refcount_dec(&req->refs); | |
4572 | return 1; | |
4573 | } | |
4574 | ||
4575 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4576 | wait_queue_func_t wake_func) | |
4577 | { | |
4578 | poll->head = NULL; | |
4579 | poll->done = false; | |
4580 | poll->canceled = false; | |
4581 | poll->events = events; | |
4582 | INIT_LIST_HEAD(&poll->wait.entry); | |
4583 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4584 | } | |
4585 | ||
4586 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4587 | struct wait_queue_head *head, |
4588 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4589 | { |
4590 | struct io_kiocb *req = pt->req; | |
4591 | ||
4592 | /* | |
4593 | * If poll->head is already set, it's because the file being polled | |
4594 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4595 | * for write). Setup a separate io_poll_iocb if this happens. | |
4596 | */ | |
4597 | if (unlikely(poll->head)) { | |
4598 | /* already have a 2nd entry, fail a third attempt */ | |
807abcb0 | 4599 | if (*poll_ptr) { |
18bceab1 JA |
4600 | pt->error = -EINVAL; |
4601 | return; | |
4602 | } | |
4603 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4604 | if (!poll) { | |
4605 | pt->error = -ENOMEM; | |
4606 | return; | |
4607 | } | |
4608 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4609 | refcount_inc(&req->refs); | |
4610 | poll->wait.private = req; | |
807abcb0 | 4611 | *poll_ptr = poll; |
18bceab1 JA |
4612 | } |
4613 | ||
4614 | pt->error = 0; | |
4615 | poll->head = head; | |
a31eb4a2 JX |
4616 | |
4617 | if (poll->events & EPOLLEXCLUSIVE) | |
4618 | add_wait_queue_exclusive(head, &poll->wait); | |
4619 | else | |
4620 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4621 | } |
4622 | ||
4623 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4624 | struct poll_table_struct *p) | |
4625 | { | |
4626 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 4627 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 4628 | |
807abcb0 | 4629 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
4630 | } |
4631 | ||
d7718a9d JA |
4632 | static void io_async_task_func(struct callback_head *cb) |
4633 | { | |
4634 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4635 | struct async_poll *apoll = req->apoll; | |
4636 | struct io_ring_ctx *ctx = req->ctx; | |
4637 | ||
4638 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4639 | ||
74ce6ce4 | 4640 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4641 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4642 | return; |
d7718a9d JA |
4643 | } |
4644 | ||
31067255 | 4645 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 4646 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 4647 | hash_del(&req->hash_node); |
2bae047e | 4648 | |
807abcb0 | 4649 | io_poll_remove_double(req, apoll->double_poll); |
74ce6ce4 JA |
4650 | spin_unlock_irq(&ctx->completion_lock); |
4651 | ||
44575a67 | 4652 | /* restore ->work in case we need to retry again */ |
405a5d2b XW |
4653 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4654 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
44575a67 | 4655 | |
0be0b0e3 PB |
4656 | if (!READ_ONCE(apoll->poll.canceled)) |
4657 | __io_req_task_submit(req); | |
4658 | else | |
4659 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 4660 | |
807abcb0 | 4661 | kfree(apoll->double_poll); |
aa340845 | 4662 | kfree(apoll); |
d7718a9d JA |
4663 | } |
4664 | ||
4665 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4666 | void *key) | |
4667 | { | |
4668 | struct io_kiocb *req = wait->private; | |
4669 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4670 | ||
4671 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4672 | key_to_poll(key)); | |
4673 | ||
4674 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4675 | } | |
4676 | ||
4677 | static void io_poll_req_insert(struct io_kiocb *req) | |
4678 | { | |
4679 | struct io_ring_ctx *ctx = req->ctx; | |
4680 | struct hlist_head *list; | |
4681 | ||
4682 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4683 | hlist_add_head(&req->hash_node, list); | |
4684 | } | |
4685 | ||
4686 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4687 | struct io_poll_iocb *poll, | |
4688 | struct io_poll_table *ipt, __poll_t mask, | |
4689 | wait_queue_func_t wake_func) | |
4690 | __acquires(&ctx->completion_lock) | |
4691 | { | |
4692 | struct io_ring_ctx *ctx = req->ctx; | |
4693 | bool cancel = false; | |
4694 | ||
18bceab1 | 4695 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4696 | poll->file = req->file; |
18bceab1 | 4697 | poll->wait.private = req; |
d7718a9d JA |
4698 | |
4699 | ipt->pt._key = mask; | |
4700 | ipt->req = req; | |
4701 | ipt->error = -EINVAL; | |
4702 | ||
d7718a9d JA |
4703 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4704 | ||
4705 | spin_lock_irq(&ctx->completion_lock); | |
4706 | if (likely(poll->head)) { | |
4707 | spin_lock(&poll->head->lock); | |
4708 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4709 | if (ipt->error) | |
4710 | cancel = true; | |
4711 | ipt->error = 0; | |
4712 | mask = 0; | |
4713 | } | |
4714 | if (mask || ipt->error) | |
4715 | list_del_init(&poll->wait.entry); | |
4716 | else if (cancel) | |
4717 | WRITE_ONCE(poll->canceled, true); | |
4718 | else if (!poll->done) /* actually waiting for an event */ | |
4719 | io_poll_req_insert(req); | |
4720 | spin_unlock(&poll->head->lock); | |
4721 | } | |
4722 | ||
4723 | return mask; | |
4724 | } | |
4725 | ||
4726 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4727 | { | |
4728 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4729 | struct io_ring_ctx *ctx = req->ctx; | |
4730 | struct async_poll *apoll; | |
4731 | struct io_poll_table ipt; | |
4732 | __poll_t mask, ret; | |
4733 | ||
4734 | if (!req->file || !file_can_poll(req->file)) | |
4735 | return false; | |
24c74678 | 4736 | if (req->flags & REQ_F_POLLED) |
d7718a9d JA |
4737 | return false; |
4738 | if (!def->pollin && !def->pollout) | |
4739 | return false; | |
4740 | ||
4741 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4742 | if (unlikely(!apoll)) | |
4743 | return false; | |
807abcb0 | 4744 | apoll->double_poll = NULL; |
d7718a9d JA |
4745 | |
4746 | req->flags |= REQ_F_POLLED; | |
405a5d2b XW |
4747 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4748 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
d7718a9d | 4749 | |
4dd2824d | 4750 | io_get_req_task(req); |
d7718a9d JA |
4751 | req->apoll = apoll; |
4752 | INIT_HLIST_NODE(&req->hash_node); | |
4753 | ||
8755d97a | 4754 | mask = 0; |
d7718a9d | 4755 | if (def->pollin) |
8755d97a | 4756 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4757 | if (def->pollout) |
4758 | mask |= POLLOUT | POLLWRNORM; | |
4759 | mask |= POLLERR | POLLPRI; | |
4760 | ||
4761 | ipt.pt._qproc = io_async_queue_proc; | |
4762 | ||
4763 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4764 | io_async_wake); | |
4765 | if (ret) { | |
807abcb0 | 4766 | io_poll_remove_double(req, apoll->double_poll); |
d7718a9d | 4767 | spin_unlock_irq(&ctx->completion_lock); |
405a5d2b XW |
4768 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4769 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
807abcb0 | 4770 | kfree(apoll->double_poll); |
d7718a9d JA |
4771 | kfree(apoll); |
4772 | return false; | |
4773 | } | |
4774 | spin_unlock_irq(&ctx->completion_lock); | |
4775 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4776 | apoll->poll.events); | |
4777 | return true; | |
4778 | } | |
4779 | ||
4780 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4781 | struct io_poll_iocb *poll) | |
221c5eb2 | 4782 | { |
b41e9852 | 4783 | bool do_complete = false; |
221c5eb2 JA |
4784 | |
4785 | spin_lock(&poll->head->lock); | |
4786 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4787 | if (!list_empty(&poll->wait.entry)) { |
4788 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4789 | do_complete = true; |
221c5eb2 JA |
4790 | } |
4791 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4792 | hash_del(&req->hash_node); |
d7718a9d JA |
4793 | return do_complete; |
4794 | } | |
4795 | ||
4796 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4797 | { | |
4798 | bool do_complete; | |
4799 | ||
4800 | if (req->opcode == IORING_OP_POLL_ADD) { | |
807abcb0 | 4801 | io_poll_remove_double(req, req->io); |
d7718a9d JA |
4802 | do_complete = __io_poll_remove_one(req, &req->poll); |
4803 | } else { | |
3bfa5bcb JA |
4804 | struct async_poll *apoll = req->apoll; |
4805 | ||
807abcb0 JA |
4806 | io_poll_remove_double(req, apoll->double_poll); |
4807 | ||
d7718a9d | 4808 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4809 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4810 | if (do_complete) { | |
d7718a9d | 4811 | io_put_req(req); |
3bfa5bcb JA |
4812 | /* |
4813 | * restore ->work because we will call | |
dca9cf8b | 4814 | * io_req_clean_work below when dropping the |
3bfa5bcb JA |
4815 | * final reference. |
4816 | */ | |
405a5d2b XW |
4817 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4818 | memcpy(&req->work, &apoll->work, | |
4819 | sizeof(req->work)); | |
807abcb0 | 4820 | kfree(apoll->double_poll); |
3bfa5bcb JA |
4821 | kfree(apoll); |
4822 | } | |
b1f573bd XW |
4823 | } |
4824 | ||
b41e9852 JA |
4825 | if (do_complete) { |
4826 | io_cqring_fill_event(req, -ECANCELED); | |
4827 | io_commit_cqring(req->ctx); | |
4828 | req->flags |= REQ_F_COMP_LOCKED; | |
4829 | io_put_req(req); | |
4830 | } | |
4831 | ||
4832 | return do_complete; | |
221c5eb2 JA |
4833 | } |
4834 | ||
4835 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4836 | { | |
78076bb6 | 4837 | struct hlist_node *tmp; |
221c5eb2 | 4838 | struct io_kiocb *req; |
8e2e1faf | 4839 | int posted = 0, i; |
221c5eb2 JA |
4840 | |
4841 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4842 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4843 | struct hlist_head *list; | |
4844 | ||
4845 | list = &ctx->cancel_hash[i]; | |
4846 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4847 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4848 | } |
4849 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4850 | |
8e2e1faf JA |
4851 | if (posted) |
4852 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4853 | } |
4854 | ||
47f46768 JA |
4855 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4856 | { | |
78076bb6 | 4857 | struct hlist_head *list; |
47f46768 JA |
4858 | struct io_kiocb *req; |
4859 | ||
78076bb6 JA |
4860 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4861 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4862 | if (sqe_addr != req->user_data) |
4863 | continue; | |
4864 | if (io_poll_remove_one(req)) | |
eac406c6 | 4865 | return 0; |
b41e9852 | 4866 | return -EALREADY; |
47f46768 JA |
4867 | } |
4868 | ||
4869 | return -ENOENT; | |
4870 | } | |
4871 | ||
3529d8c2 JA |
4872 | static int io_poll_remove_prep(struct io_kiocb *req, |
4873 | const struct io_uring_sqe *sqe) | |
0969e783 | 4874 | { |
0969e783 JA |
4875 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4876 | return -EINVAL; | |
4877 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4878 | sqe->poll_events) | |
4879 | return -EINVAL; | |
4880 | ||
4881 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4882 | return 0; |
4883 | } | |
4884 | ||
221c5eb2 JA |
4885 | /* |
4886 | * Find a running poll command that matches one specified in sqe->addr, | |
4887 | * and remove it if found. | |
4888 | */ | |
fc4df999 | 4889 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4890 | { |
4891 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4892 | u64 addr; |
47f46768 | 4893 | int ret; |
221c5eb2 | 4894 | |
0969e783 | 4895 | addr = req->poll.addr; |
221c5eb2 | 4896 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4897 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4898 | spin_unlock_irq(&ctx->completion_lock); |
4899 | ||
4e88d6e7 JA |
4900 | if (ret < 0) |
4901 | req_set_fail_links(req); | |
e1e16097 | 4902 | io_req_complete(req, ret); |
221c5eb2 JA |
4903 | return 0; |
4904 | } | |
4905 | ||
221c5eb2 JA |
4906 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4907 | void *key) | |
4908 | { | |
c2f2eb7d JA |
4909 | struct io_kiocb *req = wait->private; |
4910 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4911 | |
d7718a9d | 4912 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4913 | } |
4914 | ||
221c5eb2 JA |
4915 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4916 | struct poll_table_struct *p) | |
4917 | { | |
4918 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4919 | ||
807abcb0 | 4920 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io); |
eac406c6 JA |
4921 | } |
4922 | ||
3529d8c2 | 4923 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4924 | { |
4925 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 4926 | u32 events; |
221c5eb2 JA |
4927 | |
4928 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4929 | return -EINVAL; | |
4930 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4931 | return -EINVAL; | |
09bb8394 JA |
4932 | if (!poll->file) |
4933 | return -EBADF; | |
221c5eb2 | 4934 | |
5769a351 JX |
4935 | events = READ_ONCE(sqe->poll32_events); |
4936 | #ifdef __BIG_ENDIAN | |
4937 | events = swahw32(events); | |
4938 | #endif | |
a31eb4a2 JX |
4939 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
4940 | (events & EPOLLEXCLUSIVE); | |
b41e9852 | 4941 | |
4dd2824d | 4942 | io_get_req_task(req); |
0969e783 JA |
4943 | return 0; |
4944 | } | |
4945 | ||
014db007 | 4946 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4947 | { |
4948 | struct io_poll_iocb *poll = &req->poll; | |
4949 | struct io_ring_ctx *ctx = req->ctx; | |
4950 | struct io_poll_table ipt; | |
0969e783 | 4951 | __poll_t mask; |
0969e783 | 4952 | |
d5e16d8e | 4953 | /* ->work is in union with hash_node and others */ |
dca9cf8b | 4954 | io_req_clean_work(req); |
d5e16d8e PB |
4955 | req->flags &= ~REQ_F_WORK_INITIALIZED; |
4956 | ||
78076bb6 | 4957 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 4958 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4959 | |
d7718a9d JA |
4960 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4961 | io_poll_wake); | |
221c5eb2 | 4962 | |
8c838788 | 4963 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4964 | ipt.error = 0; |
b0dd8a41 | 4965 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4966 | } |
221c5eb2 JA |
4967 | spin_unlock_irq(&ctx->completion_lock); |
4968 | ||
8c838788 JA |
4969 | if (mask) { |
4970 | io_cqring_ev_posted(ctx); | |
014db007 | 4971 | io_put_req(req); |
221c5eb2 | 4972 | } |
8c838788 | 4973 | return ipt.error; |
221c5eb2 JA |
4974 | } |
4975 | ||
5262f567 JA |
4976 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4977 | { | |
ad8a48ac JA |
4978 | struct io_timeout_data *data = container_of(timer, |
4979 | struct io_timeout_data, timer); | |
4980 | struct io_kiocb *req = data->req; | |
4981 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4982 | unsigned long flags; |
4983 | ||
5262f567 JA |
4984 | atomic_inc(&ctx->cq_timeouts); |
4985 | ||
4986 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4987 | /* |
11365043 JA |
4988 | * We could be racing with timeout deletion. If the list is empty, |
4989 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4990 | */ |
135fcde8 PB |
4991 | if (!list_empty(&req->timeout.list)) |
4992 | list_del_init(&req->timeout.list); | |
5262f567 | 4993 | |
78e19bbe | 4994 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4995 | io_commit_cqring(ctx); |
4996 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4997 | ||
4998 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4999 | req_set_fail_links(req); |
5262f567 JA |
5000 | io_put_req(req); |
5001 | return HRTIMER_NORESTART; | |
5002 | } | |
5003 | ||
47f46768 JA |
5004 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5005 | { | |
5006 | struct io_kiocb *req; | |
5007 | int ret = -ENOENT; | |
5008 | ||
135fcde8 | 5009 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5010 | if (user_data == req->user_data) { |
135fcde8 | 5011 | list_del_init(&req->timeout.list); |
47f46768 JA |
5012 | ret = 0; |
5013 | break; | |
5014 | } | |
5015 | } | |
5016 | ||
5017 | if (ret == -ENOENT) | |
5018 | return ret; | |
5019 | ||
2d28390a | 5020 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
5021 | if (ret == -1) |
5022 | return -EALREADY; | |
5023 | ||
4e88d6e7 | 5024 | req_set_fail_links(req); |
47f46768 JA |
5025 | io_cqring_fill_event(req, -ECANCELED); |
5026 | io_put_req(req); | |
5027 | return 0; | |
5028 | } | |
5029 | ||
3529d8c2 JA |
5030 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5031 | const struct io_uring_sqe *sqe) | |
b29472ee | 5032 | { |
b29472ee JA |
5033 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5034 | return -EINVAL; | |
61710e43 DA |
5035 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5036 | return -EINVAL; | |
5037 | if (sqe->ioprio || sqe->buf_index || sqe->len) | |
b29472ee JA |
5038 | return -EINVAL; |
5039 | ||
5040 | req->timeout.addr = READ_ONCE(sqe->addr); | |
5041 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
5042 | if (req->timeout.flags) | |
5043 | return -EINVAL; | |
5044 | ||
b29472ee JA |
5045 | return 0; |
5046 | } | |
5047 | ||
11365043 JA |
5048 | /* |
5049 | * Remove or update an existing timeout command | |
5050 | */ | |
fc4df999 | 5051 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5052 | { |
5053 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5054 | int ret; |
11365043 | 5055 | |
11365043 | 5056 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5057 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5058 | |
47f46768 | 5059 | io_cqring_fill_event(req, ret); |
11365043 JA |
5060 | io_commit_cqring(ctx); |
5061 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5062 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5063 | if (ret < 0) |
5064 | req_set_fail_links(req); | |
ec9c02ad | 5065 | io_put_req(req); |
11365043 | 5066 | return 0; |
5262f567 JA |
5067 | } |
5068 | ||
3529d8c2 | 5069 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5070 | bool is_timeout_link) |
5262f567 | 5071 | { |
ad8a48ac | 5072 | struct io_timeout_data *data; |
a41525ab | 5073 | unsigned flags; |
56080b02 | 5074 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5075 | |
ad8a48ac | 5076 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5077 | return -EINVAL; |
ad8a48ac | 5078 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5079 | return -EINVAL; |
56080b02 | 5080 | if (off && is_timeout_link) |
2d28390a | 5081 | return -EINVAL; |
a41525ab JA |
5082 | flags = READ_ONCE(sqe->timeout_flags); |
5083 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5084 | return -EINVAL; |
bdf20073 | 5085 | |
bfe68a22 | 5086 | req->timeout.off = off; |
26a61679 | 5087 | |
3529d8c2 | 5088 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5089 | return -ENOMEM; |
5090 | ||
5091 | data = &req->io->timeout; | |
ad8a48ac | 5092 | data->req = req; |
ad8a48ac JA |
5093 | |
5094 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5095 | return -EFAULT; |
5096 | ||
11365043 | 5097 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5098 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5099 | else |
ad8a48ac | 5100 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5101 | |
ad8a48ac JA |
5102 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5103 | return 0; | |
5104 | } | |
5105 | ||
fc4df999 | 5106 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5107 | { |
ad8a48ac | 5108 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5109 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5110 | struct list_head *entry; |
bfe68a22 | 5111 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5112 | |
733f5c95 | 5113 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5114 | |
5262f567 JA |
5115 | /* |
5116 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5117 | * timeout event to be satisfied. If it isn't set, then this is |
5118 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5119 | */ |
8eb7e2d0 | 5120 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5121 | entry = ctx->timeout_list.prev; |
5122 | goto add; | |
5123 | } | |
5262f567 | 5124 | |
bfe68a22 PB |
5125 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5126 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5127 | |
5128 | /* | |
5129 | * Insertion sort, ensuring the first entry in the list is always | |
5130 | * the one we need first. | |
5131 | */ | |
5262f567 | 5132 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5133 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5134 | timeout.list); | |
5262f567 | 5135 | |
8eb7e2d0 | 5136 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5137 | continue; |
bfe68a22 PB |
5138 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5139 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5140 | break; |
5141 | } | |
93bd25bb | 5142 | add: |
135fcde8 | 5143 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5144 | data->timer.function = io_timeout_fn; |
5145 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5146 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5147 | return 0; |
5148 | } | |
5262f567 | 5149 | |
62755e35 JA |
5150 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5151 | { | |
5152 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5153 | ||
5154 | return req->user_data == (unsigned long) data; | |
5155 | } | |
5156 | ||
e977d6d3 | 5157 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5158 | { |
62755e35 | 5159 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5160 | int ret = 0; |
5161 | ||
4f26bda1 | 5162 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5163 | switch (cancel_ret) { |
5164 | case IO_WQ_CANCEL_OK: | |
5165 | ret = 0; | |
5166 | break; | |
5167 | case IO_WQ_CANCEL_RUNNING: | |
5168 | ret = -EALREADY; | |
5169 | break; | |
5170 | case IO_WQ_CANCEL_NOTFOUND: | |
5171 | ret = -ENOENT; | |
5172 | break; | |
5173 | } | |
5174 | ||
e977d6d3 JA |
5175 | return ret; |
5176 | } | |
5177 | ||
47f46768 JA |
5178 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5179 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5180 | int success_ret) |
47f46768 JA |
5181 | { |
5182 | unsigned long flags; | |
5183 | int ret; | |
5184 | ||
5185 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5186 | if (ret != -ENOENT) { | |
5187 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5188 | goto done; | |
5189 | } | |
5190 | ||
5191 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5192 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5193 | if (ret != -ENOENT) | |
5194 | goto done; | |
5195 | ret = io_poll_cancel(ctx, sqe_addr); | |
5196 | done: | |
b0dd8a41 JA |
5197 | if (!ret) |
5198 | ret = success_ret; | |
47f46768 JA |
5199 | io_cqring_fill_event(req, ret); |
5200 | io_commit_cqring(ctx); | |
5201 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5202 | io_cqring_ev_posted(ctx); | |
5203 | ||
4e88d6e7 JA |
5204 | if (ret < 0) |
5205 | req_set_fail_links(req); | |
014db007 | 5206 | io_put_req(req); |
47f46768 JA |
5207 | } |
5208 | ||
3529d8c2 JA |
5209 | static int io_async_cancel_prep(struct io_kiocb *req, |
5210 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5211 | { |
fbf23849 | 5212 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5213 | return -EINVAL; |
61710e43 DA |
5214 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5215 | return -EINVAL; | |
5216 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5217 | return -EINVAL; |
5218 | ||
fbf23849 JA |
5219 | req->cancel.addr = READ_ONCE(sqe->addr); |
5220 | return 0; | |
5221 | } | |
5222 | ||
014db007 | 5223 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5224 | { |
5225 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5226 | |
014db007 | 5227 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5228 | return 0; |
5229 | } | |
5230 | ||
05f3fb3c JA |
5231 | static int io_files_update_prep(struct io_kiocb *req, |
5232 | const struct io_uring_sqe *sqe) | |
5233 | { | |
61710e43 DA |
5234 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5235 | return -EINVAL; | |
5236 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5237 | return -EINVAL; |
5238 | ||
5239 | req->files_update.offset = READ_ONCE(sqe->off); | |
5240 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5241 | if (!req->files_update.nr_args) | |
5242 | return -EINVAL; | |
5243 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5244 | return 0; | |
5245 | } | |
5246 | ||
229a7b63 JA |
5247 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5248 | struct io_comp_state *cs) | |
fbf23849 JA |
5249 | { |
5250 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5251 | struct io_uring_files_update up; |
5252 | int ret; | |
fbf23849 | 5253 | |
f86cd20c | 5254 | if (force_nonblock) |
05f3fb3c | 5255 | return -EAGAIN; |
05f3fb3c JA |
5256 | |
5257 | up.offset = req->files_update.offset; | |
5258 | up.fds = req->files_update.arg; | |
5259 | ||
5260 | mutex_lock(&ctx->uring_lock); | |
5261 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5262 | mutex_unlock(&ctx->uring_lock); | |
5263 | ||
5264 | if (ret < 0) | |
5265 | req_set_fail_links(req); | |
229a7b63 | 5266 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5267 | return 0; |
5268 | } | |
5269 | ||
3529d8c2 | 5270 | static int io_req_defer_prep(struct io_kiocb *req, |
debb85f4 | 5271 | const struct io_uring_sqe *sqe) |
f67676d1 | 5272 | { |
e781573e | 5273 | ssize_t ret = 0; |
f67676d1 | 5274 | |
f1d96a8f PB |
5275 | if (!sqe) |
5276 | return 0; | |
5277 | ||
327d6d96 PB |
5278 | if (io_alloc_async_ctx(req)) |
5279 | return -EAGAIN; | |
5280 | ||
710c2bfb | 5281 | if (io_op_defs[req->opcode].file_table) { |
c40f6379 | 5282 | io_req_init_async(req); |
710c2bfb PB |
5283 | ret = io_grab_files(req); |
5284 | if (unlikely(ret)) | |
5285 | return ret; | |
5286 | } | |
7cdaf587 | 5287 | |
d625c6ee | 5288 | switch (req->opcode) { |
e781573e JA |
5289 | case IORING_OP_NOP: |
5290 | break; | |
f67676d1 JA |
5291 | case IORING_OP_READV: |
5292 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5293 | case IORING_OP_READ: |
3529d8c2 | 5294 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5295 | break; |
5296 | case IORING_OP_WRITEV: | |
5297 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5298 | case IORING_OP_WRITE: |
3529d8c2 | 5299 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5300 | break; |
0969e783 | 5301 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5302 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5303 | break; |
5304 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5305 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5306 | break; |
8ed8d3c3 | 5307 | case IORING_OP_FSYNC: |
3529d8c2 | 5308 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5309 | break; |
5310 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5311 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5312 | break; |
03b1230c | 5313 | case IORING_OP_SENDMSG: |
fddaface | 5314 | case IORING_OP_SEND: |
3529d8c2 | 5315 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5316 | break; |
5317 | case IORING_OP_RECVMSG: | |
fddaface | 5318 | case IORING_OP_RECV: |
3529d8c2 | 5319 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5320 | break; |
f499a021 | 5321 | case IORING_OP_CONNECT: |
3529d8c2 | 5322 | ret = io_connect_prep(req, sqe); |
f499a021 | 5323 | break; |
2d28390a | 5324 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5325 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5326 | break; |
b29472ee | 5327 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5328 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5329 | break; |
fbf23849 | 5330 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5331 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5332 | break; |
2d28390a | 5333 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5334 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5335 | break; |
8ed8d3c3 | 5336 | case IORING_OP_ACCEPT: |
3529d8c2 | 5337 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5338 | break; |
d63d1b5e JA |
5339 | case IORING_OP_FALLOCATE: |
5340 | ret = io_fallocate_prep(req, sqe); | |
5341 | break; | |
15b71abe JA |
5342 | case IORING_OP_OPENAT: |
5343 | ret = io_openat_prep(req, sqe); | |
5344 | break; | |
b5dba59e JA |
5345 | case IORING_OP_CLOSE: |
5346 | ret = io_close_prep(req, sqe); | |
5347 | break; | |
05f3fb3c JA |
5348 | case IORING_OP_FILES_UPDATE: |
5349 | ret = io_files_update_prep(req, sqe); | |
5350 | break; | |
eddc7ef5 JA |
5351 | case IORING_OP_STATX: |
5352 | ret = io_statx_prep(req, sqe); | |
5353 | break; | |
4840e418 JA |
5354 | case IORING_OP_FADVISE: |
5355 | ret = io_fadvise_prep(req, sqe); | |
5356 | break; | |
c1ca757b JA |
5357 | case IORING_OP_MADVISE: |
5358 | ret = io_madvise_prep(req, sqe); | |
5359 | break; | |
cebdb986 JA |
5360 | case IORING_OP_OPENAT2: |
5361 | ret = io_openat2_prep(req, sqe); | |
5362 | break; | |
3e4827b0 JA |
5363 | case IORING_OP_EPOLL_CTL: |
5364 | ret = io_epoll_ctl_prep(req, sqe); | |
5365 | break; | |
7d67af2c PB |
5366 | case IORING_OP_SPLICE: |
5367 | ret = io_splice_prep(req, sqe); | |
5368 | break; | |
ddf0322d JA |
5369 | case IORING_OP_PROVIDE_BUFFERS: |
5370 | ret = io_provide_buffers_prep(req, sqe); | |
5371 | break; | |
067524e9 JA |
5372 | case IORING_OP_REMOVE_BUFFERS: |
5373 | ret = io_remove_buffers_prep(req, sqe); | |
5374 | break; | |
f2a8d5c7 PB |
5375 | case IORING_OP_TEE: |
5376 | ret = io_tee_prep(req, sqe); | |
5377 | break; | |
f67676d1 | 5378 | default: |
e781573e JA |
5379 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5380 | req->opcode); | |
5381 | ret = -EINVAL; | |
b7bb4f7d | 5382 | break; |
f67676d1 JA |
5383 | } |
5384 | ||
b7bb4f7d | 5385 | return ret; |
f67676d1 JA |
5386 | } |
5387 | ||
9cf7c104 PB |
5388 | static u32 io_get_sequence(struct io_kiocb *req) |
5389 | { | |
5390 | struct io_kiocb *pos; | |
5391 | struct io_ring_ctx *ctx = req->ctx; | |
5392 | u32 total_submitted, nr_reqs = 1; | |
5393 | ||
5394 | if (req->flags & REQ_F_LINK_HEAD) | |
5395 | list_for_each_entry(pos, &req->link_list, link_list) | |
5396 | nr_reqs++; | |
5397 | ||
5398 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5399 | return total_submitted - nr_reqs; | |
5400 | } | |
5401 | ||
3529d8c2 | 5402 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5403 | { |
a197f664 | 5404 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5405 | struct io_defer_entry *de; |
f67676d1 | 5406 | int ret; |
9cf7c104 | 5407 | u32 seq; |
de0617e4 | 5408 | |
9d858b21 | 5409 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5410 | if (likely(list_empty_careful(&ctx->defer_list) && |
5411 | !(req->flags & REQ_F_IO_DRAIN))) | |
5412 | return 0; | |
5413 | ||
5414 | seq = io_get_sequence(req); | |
5415 | /* Still a chance to pass the sequence check */ | |
5416 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5417 | return 0; |
5418 | ||
650b5481 | 5419 | if (!req->io) { |
debb85f4 | 5420 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5421 | if (ret) |
650b5481 PB |
5422 | return ret; |
5423 | } | |
cbdcb435 | 5424 | io_prep_async_link(req); |
27dc8338 PB |
5425 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5426 | if (!de) | |
5427 | return -ENOMEM; | |
2d28390a | 5428 | |
de0617e4 | 5429 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5430 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5431 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5432 | kfree(de); |
de0617e4 JA |
5433 | return 0; |
5434 | } | |
5435 | ||
915967f6 | 5436 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5437 | de->req = req; |
9cf7c104 | 5438 | de->seq = seq; |
27dc8338 | 5439 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5440 | spin_unlock_irq(&ctx->completion_lock); |
5441 | return -EIOCBQUEUED; | |
5442 | } | |
5443 | ||
3ca405eb | 5444 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 PB |
5445 | { |
5446 | struct io_async_ctx *io = req->io; | |
5447 | ||
5448 | switch (req->opcode) { | |
5449 | case IORING_OP_READV: | |
5450 | case IORING_OP_READ_FIXED: | |
5451 | case IORING_OP_READ: | |
bcda7baa JA |
5452 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5453 | kfree((void *)(unsigned long)req->rw.addr); | |
5454 | /* fallthrough */ | |
99bc4c38 PB |
5455 | case IORING_OP_WRITEV: |
5456 | case IORING_OP_WRITE_FIXED: | |
5457 | case IORING_OP_WRITE: | |
5458 | if (io->rw.iov != io->rw.fast_iov) | |
5459 | kfree(io->rw.iov); | |
5460 | break; | |
99bc4c38 | 5461 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5462 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5463 | kfree(req->sr_msg.kbuf); | |
5464 | /* fallthrough */ | |
5465 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5466 | if (io->msg.iov != io->msg.fast_iov) |
5467 | kfree(io->msg.iov); | |
5468 | break; | |
bcda7baa JA |
5469 | case IORING_OP_RECV: |
5470 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5471 | kfree(req->sr_msg.kbuf); | |
5472 | break; | |
7d67af2c | 5473 | case IORING_OP_SPLICE: |
f2a8d5c7 | 5474 | case IORING_OP_TEE: |
7d67af2c PB |
5475 | io_put_file(req, req->splice.file_in, |
5476 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5477 | break; | |
99bc4c38 PB |
5478 | } |
5479 | ||
5480 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5481 | } | |
5482 | ||
3529d8c2 | 5483 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5484 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5485 | { |
a197f664 | 5486 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5487 | int ret; |
2b188cc1 | 5488 | |
d625c6ee | 5489 | switch (req->opcode) { |
2b188cc1 | 5490 | case IORING_OP_NOP: |
229a7b63 | 5491 | ret = io_nop(req, cs); |
2b188cc1 JA |
5492 | break; |
5493 | case IORING_OP_READV: | |
edafccee | 5494 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5495 | case IORING_OP_READ: |
3529d8c2 JA |
5496 | if (sqe) { |
5497 | ret = io_read_prep(req, sqe, force_nonblock); | |
5498 | if (ret < 0) | |
5499 | break; | |
5500 | } | |
a1d7c393 | 5501 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5502 | break; |
3529d8c2 | 5503 | case IORING_OP_WRITEV: |
edafccee | 5504 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5505 | case IORING_OP_WRITE: |
3529d8c2 JA |
5506 | if (sqe) { |
5507 | ret = io_write_prep(req, sqe, force_nonblock); | |
5508 | if (ret < 0) | |
5509 | break; | |
5510 | } | |
a1d7c393 | 5511 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5512 | break; |
c992fe29 | 5513 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5514 | if (sqe) { |
5515 | ret = io_prep_fsync(req, sqe); | |
5516 | if (ret < 0) | |
5517 | break; | |
5518 | } | |
014db007 | 5519 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5520 | break; |
221c5eb2 | 5521 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5522 | if (sqe) { |
5523 | ret = io_poll_add_prep(req, sqe); | |
5524 | if (ret) | |
5525 | break; | |
5526 | } | |
014db007 | 5527 | ret = io_poll_add(req); |
221c5eb2 JA |
5528 | break; |
5529 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5530 | if (sqe) { |
5531 | ret = io_poll_remove_prep(req, sqe); | |
5532 | if (ret < 0) | |
5533 | break; | |
5534 | } | |
fc4df999 | 5535 | ret = io_poll_remove(req); |
221c5eb2 | 5536 | break; |
5d17b4a4 | 5537 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5538 | if (sqe) { |
5539 | ret = io_prep_sfr(req, sqe); | |
5540 | if (ret < 0) | |
5541 | break; | |
5542 | } | |
014db007 | 5543 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5544 | break; |
0fa03c62 | 5545 | case IORING_OP_SENDMSG: |
fddaface | 5546 | case IORING_OP_SEND: |
3529d8c2 JA |
5547 | if (sqe) { |
5548 | ret = io_sendmsg_prep(req, sqe); | |
5549 | if (ret < 0) | |
5550 | break; | |
5551 | } | |
fddaface | 5552 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5553 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5554 | else |
229a7b63 | 5555 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5556 | break; |
aa1fa28f | 5557 | case IORING_OP_RECVMSG: |
fddaface | 5558 | case IORING_OP_RECV: |
3529d8c2 JA |
5559 | if (sqe) { |
5560 | ret = io_recvmsg_prep(req, sqe); | |
5561 | if (ret) | |
5562 | break; | |
5563 | } | |
fddaface | 5564 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5565 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5566 | else |
229a7b63 | 5567 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5568 | break; |
5262f567 | 5569 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5570 | if (sqe) { |
5571 | ret = io_timeout_prep(req, sqe, false); | |
5572 | if (ret) | |
5573 | break; | |
5574 | } | |
fc4df999 | 5575 | ret = io_timeout(req); |
5262f567 | 5576 | break; |
11365043 | 5577 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5578 | if (sqe) { |
5579 | ret = io_timeout_remove_prep(req, sqe); | |
5580 | if (ret) | |
5581 | break; | |
5582 | } | |
fc4df999 | 5583 | ret = io_timeout_remove(req); |
11365043 | 5584 | break; |
17f2fe35 | 5585 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5586 | if (sqe) { |
5587 | ret = io_accept_prep(req, sqe); | |
5588 | if (ret) | |
5589 | break; | |
5590 | } | |
229a7b63 | 5591 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5592 | break; |
f8e85cf2 | 5593 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5594 | if (sqe) { |
5595 | ret = io_connect_prep(req, sqe); | |
5596 | if (ret) | |
5597 | break; | |
5598 | } | |
229a7b63 | 5599 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5600 | break; |
62755e35 | 5601 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5602 | if (sqe) { |
5603 | ret = io_async_cancel_prep(req, sqe); | |
5604 | if (ret) | |
5605 | break; | |
5606 | } | |
014db007 | 5607 | ret = io_async_cancel(req); |
62755e35 | 5608 | break; |
d63d1b5e JA |
5609 | case IORING_OP_FALLOCATE: |
5610 | if (sqe) { | |
5611 | ret = io_fallocate_prep(req, sqe); | |
5612 | if (ret) | |
5613 | break; | |
5614 | } | |
014db007 | 5615 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5616 | break; |
15b71abe JA |
5617 | case IORING_OP_OPENAT: |
5618 | if (sqe) { | |
5619 | ret = io_openat_prep(req, sqe); | |
5620 | if (ret) | |
5621 | break; | |
5622 | } | |
014db007 | 5623 | ret = io_openat(req, force_nonblock); |
15b71abe | 5624 | break; |
b5dba59e JA |
5625 | case IORING_OP_CLOSE: |
5626 | if (sqe) { | |
5627 | ret = io_close_prep(req, sqe); | |
5628 | if (ret) | |
5629 | break; | |
5630 | } | |
229a7b63 | 5631 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5632 | break; |
05f3fb3c JA |
5633 | case IORING_OP_FILES_UPDATE: |
5634 | if (sqe) { | |
5635 | ret = io_files_update_prep(req, sqe); | |
5636 | if (ret) | |
5637 | break; | |
5638 | } | |
229a7b63 | 5639 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5640 | break; |
eddc7ef5 JA |
5641 | case IORING_OP_STATX: |
5642 | if (sqe) { | |
5643 | ret = io_statx_prep(req, sqe); | |
5644 | if (ret) | |
5645 | break; | |
5646 | } | |
014db007 | 5647 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5648 | break; |
4840e418 JA |
5649 | case IORING_OP_FADVISE: |
5650 | if (sqe) { | |
5651 | ret = io_fadvise_prep(req, sqe); | |
5652 | if (ret) | |
5653 | break; | |
5654 | } | |
014db007 | 5655 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5656 | break; |
c1ca757b JA |
5657 | case IORING_OP_MADVISE: |
5658 | if (sqe) { | |
5659 | ret = io_madvise_prep(req, sqe); | |
5660 | if (ret) | |
5661 | break; | |
5662 | } | |
014db007 | 5663 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5664 | break; |
cebdb986 JA |
5665 | case IORING_OP_OPENAT2: |
5666 | if (sqe) { | |
5667 | ret = io_openat2_prep(req, sqe); | |
5668 | if (ret) | |
5669 | break; | |
5670 | } | |
014db007 | 5671 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5672 | break; |
3e4827b0 JA |
5673 | case IORING_OP_EPOLL_CTL: |
5674 | if (sqe) { | |
5675 | ret = io_epoll_ctl_prep(req, sqe); | |
5676 | if (ret) | |
5677 | break; | |
5678 | } | |
229a7b63 | 5679 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5680 | break; |
7d67af2c PB |
5681 | case IORING_OP_SPLICE: |
5682 | if (sqe) { | |
5683 | ret = io_splice_prep(req, sqe); | |
5684 | if (ret < 0) | |
5685 | break; | |
5686 | } | |
014db007 | 5687 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5688 | break; |
ddf0322d JA |
5689 | case IORING_OP_PROVIDE_BUFFERS: |
5690 | if (sqe) { | |
5691 | ret = io_provide_buffers_prep(req, sqe); | |
5692 | if (ret) | |
5693 | break; | |
5694 | } | |
229a7b63 | 5695 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5696 | break; |
067524e9 JA |
5697 | case IORING_OP_REMOVE_BUFFERS: |
5698 | if (sqe) { | |
5699 | ret = io_remove_buffers_prep(req, sqe); | |
5700 | if (ret) | |
5701 | break; | |
5702 | } | |
229a7b63 | 5703 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5704 | break; |
f2a8d5c7 PB |
5705 | case IORING_OP_TEE: |
5706 | if (sqe) { | |
5707 | ret = io_tee_prep(req, sqe); | |
5708 | if (ret < 0) | |
5709 | break; | |
5710 | } | |
5711 | ret = io_tee(req, force_nonblock); | |
5712 | break; | |
2b188cc1 JA |
5713 | default: |
5714 | ret = -EINVAL; | |
5715 | break; | |
5716 | } | |
5717 | ||
def596e9 JA |
5718 | if (ret) |
5719 | return ret; | |
5720 | ||
b532576e JA |
5721 | /* If the op doesn't have a file, we're not polling for it */ |
5722 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5723 | const bool in_async = io_wq_current_is_worker(); |
5724 | ||
11ba820b JA |
5725 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5726 | if (in_async) | |
5727 | mutex_lock(&ctx->uring_lock); | |
5728 | ||
def596e9 | 5729 | io_iopoll_req_issued(req); |
11ba820b JA |
5730 | |
5731 | if (in_async) | |
5732 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5733 | } |
5734 | ||
5735 | return 0; | |
2b188cc1 JA |
5736 | } |
5737 | ||
f4db7182 | 5738 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
5739 | { |
5740 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 5741 | struct io_kiocb *timeout; |
561fb04a | 5742 | int ret = 0; |
2b188cc1 | 5743 | |
6df1db6b PB |
5744 | timeout = io_prep_linked_timeout(req); |
5745 | if (timeout) | |
5746 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 5747 | |
0c9d5ccd JA |
5748 | /* if NO_CANCEL is set, we must still run the work */ |
5749 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5750 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5751 | ret = -ECANCELED; |
0c9d5ccd | 5752 | } |
31b51510 | 5753 | |
561fb04a | 5754 | if (!ret) { |
561fb04a | 5755 | do { |
f13fad7b | 5756 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
5757 | /* |
5758 | * We can get EAGAIN for polled IO even though we're | |
5759 | * forcing a sync submission from here, since we can't | |
5760 | * wait for request slots on the block side. | |
5761 | */ | |
5762 | if (ret != -EAGAIN) | |
5763 | break; | |
5764 | cond_resched(); | |
5765 | } while (1); | |
5766 | } | |
31b51510 | 5767 | |
561fb04a | 5768 | if (ret) { |
4e88d6e7 | 5769 | req_set_fail_links(req); |
e1e16097 | 5770 | io_req_complete(req, ret); |
edafccee | 5771 | } |
2b188cc1 | 5772 | |
f4db7182 | 5773 | return io_steal_work(req); |
2b188cc1 JA |
5774 | } |
5775 | ||
65e19f54 JA |
5776 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5777 | int index) | |
5778 | { | |
5779 | struct fixed_file_table *table; | |
5780 | ||
05f3fb3c | 5781 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5782 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5783 | } |
5784 | ||
8da11c19 PB |
5785 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5786 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5787 | { |
a197f664 | 5788 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5789 | struct file *file; |
09bb8394 | 5790 | |
8da11c19 | 5791 | if (fixed) { |
05f3fb3c | 5792 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5793 | (unsigned) fd >= ctx->nr_user_files)) |
5794 | return -EBADF; | |
b7620121 | 5795 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5796 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5797 | if (file) { |
5798 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5799 | percpu_ref_get(req->fixed_file_refs); | |
5800 | } | |
09bb8394 | 5801 | } else { |
c826bd7a | 5802 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5803 | file = __io_file_get(state, fd); |
09bb8394 JA |
5804 | } |
5805 | ||
fd2206e4 JA |
5806 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5807 | *out_file = file; | |
5808 | return 0; | |
5809 | } | |
5810 | return -EBADF; | |
09bb8394 JA |
5811 | } |
5812 | ||
8da11c19 | 5813 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5814 | int fd) |
8da11c19 | 5815 | { |
8da11c19 PB |
5816 | bool fixed; |
5817 | ||
63ff8223 | 5818 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5819 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5820 | return -EBADF; |
5821 | ||
5822 | return io_file_get(state, req, fd, &req->file, fixed); | |
5823 | } | |
5824 | ||
a197f664 | 5825 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5826 | { |
5827 | int ret = -EBADF; | |
a197f664 | 5828 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5829 | |
5b0bbee4 | 5830 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5831 | return 0; |
b14cca0c | 5832 | if (!ctx->ring_file) |
b5dba59e JA |
5833 | return -EBADF; |
5834 | ||
fcb323cc JA |
5835 | rcu_read_lock(); |
5836 | spin_lock_irq(&ctx->inflight_lock); | |
5837 | /* | |
5838 | * We use the f_ops->flush() handler to ensure that we can flush | |
5839 | * out work accessing these files if the fd is closed. Check if | |
5840 | * the fd has changed since we started down this path, and disallow | |
5841 | * this operation if it has. | |
5842 | */ | |
b14cca0c | 5843 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5844 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5845 | req->flags |= REQ_F_INFLIGHT; | |
5846 | req->work.files = current->files; | |
5847 | ret = 0; | |
5848 | } | |
5849 | spin_unlock_irq(&ctx->inflight_lock); | |
5850 | rcu_read_unlock(); | |
5851 | ||
5852 | return ret; | |
5853 | } | |
5854 | ||
2665abfd | 5855 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5856 | { |
ad8a48ac JA |
5857 | struct io_timeout_data *data = container_of(timer, |
5858 | struct io_timeout_data, timer); | |
5859 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5860 | struct io_ring_ctx *ctx = req->ctx; |
5861 | struct io_kiocb *prev = NULL; | |
5862 | unsigned long flags; | |
2665abfd JA |
5863 | |
5864 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5865 | ||
5866 | /* | |
5867 | * We don't expect the list to be empty, that will only happen if we | |
5868 | * race with the completion of the linked work. | |
5869 | */ | |
4493233e PB |
5870 | if (!list_empty(&req->link_list)) { |
5871 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5872 | link_list); | |
5d960724 | 5873 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5874 | list_del_init(&req->link_list); |
5d960724 JA |
5875 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5876 | } else | |
76a46e06 | 5877 | prev = NULL; |
2665abfd JA |
5878 | } |
5879 | ||
5880 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5881 | ||
5882 | if (prev) { | |
4e88d6e7 | 5883 | req_set_fail_links(prev); |
014db007 | 5884 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5885 | io_put_req(prev); |
47f46768 | 5886 | } else { |
e1e16097 | 5887 | io_req_complete(req, -ETIME); |
2665abfd | 5888 | } |
2665abfd JA |
5889 | return HRTIMER_NORESTART; |
5890 | } | |
5891 | ||
ad8a48ac | 5892 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5893 | { |
76a46e06 | 5894 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5895 | |
76a46e06 JA |
5896 | /* |
5897 | * If the list is now empty, then our linked request finished before | |
5898 | * we got a chance to setup the timer | |
5899 | */ | |
5900 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5901 | if (!list_empty(&req->link_list)) { |
2d28390a | 5902 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5903 | |
ad8a48ac JA |
5904 | data->timer.function = io_link_timeout_fn; |
5905 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5906 | data->mode); | |
2665abfd | 5907 | } |
76a46e06 | 5908 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5909 | |
2665abfd | 5910 | /* drop submission reference */ |
76a46e06 JA |
5911 | io_put_req(req); |
5912 | } | |
2665abfd | 5913 | |
ad8a48ac | 5914 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5915 | { |
5916 | struct io_kiocb *nxt; | |
5917 | ||
dea3b49c | 5918 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 5919 | return NULL; |
6df1db6b | 5920 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 5921 | return NULL; |
2665abfd | 5922 | |
4493233e PB |
5923 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5924 | link_list); | |
d625c6ee | 5925 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5926 | return NULL; |
2665abfd | 5927 | |
76a46e06 | 5928 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5929 | return nxt; |
2665abfd JA |
5930 | } |
5931 | ||
f13fad7b JA |
5932 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
5933 | struct io_comp_state *cs) | |
2b188cc1 | 5934 | { |
4a0a7a18 | 5935 | struct io_kiocb *linked_timeout; |
4bc4494e | 5936 | struct io_kiocb *nxt; |
193155c8 | 5937 | const struct cred *old_creds = NULL; |
e0c5c576 | 5938 | int ret; |
2b188cc1 | 5939 | |
4a0a7a18 JA |
5940 | again: |
5941 | linked_timeout = io_prep_linked_timeout(req); | |
5942 | ||
7cdaf587 XW |
5943 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
5944 | req->work.creds != current_cred()) { | |
193155c8 JA |
5945 | if (old_creds) |
5946 | revert_creds(old_creds); | |
5947 | if (old_creds == req->work.creds) | |
5948 | old_creds = NULL; /* restored original creds */ | |
5949 | else | |
5950 | old_creds = override_creds(req->work.creds); | |
5951 | } | |
5952 | ||
f13fad7b | 5953 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
5954 | |
5955 | /* | |
5956 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5957 | * doesn't support non-blocking read/write attempts | |
5958 | */ | |
24c74678 | 5959 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d7718a9d JA |
5960 | if (io_arm_poll_handler(req)) { |
5961 | if (linked_timeout) | |
5962 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5963 | goto exit; |
d7718a9d | 5964 | } |
86a761f8 | 5965 | punt: |
7cdaf587 XW |
5966 | io_req_init_async(req); |
5967 | ||
f86cd20c | 5968 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5969 | ret = io_grab_files(req); |
5970 | if (ret) | |
5971 | goto err; | |
2b188cc1 | 5972 | } |
bbad27b2 PB |
5973 | |
5974 | /* | |
5975 | * Queued up for async execution, worker will release | |
5976 | * submit reference when the iocb is actually submitted. | |
5977 | */ | |
5978 | io_queue_async_work(req); | |
4bc4494e | 5979 | goto exit; |
2b188cc1 | 5980 | } |
e65ef56d | 5981 | |
652532ad | 5982 | if (unlikely(ret)) { |
fcb323cc | 5983 | err: |
652532ad PB |
5984 | /* un-prep timeout, so it'll be killed as any other linked */ |
5985 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 5986 | req_set_fail_links(req); |
652532ad | 5987 | io_put_req(req); |
e1e16097 | 5988 | io_req_complete(req, ret); |
652532ad | 5989 | goto exit; |
9e645e11 | 5990 | } |
652532ad PB |
5991 | |
5992 | /* drop submission reference */ | |
5993 | nxt = io_put_req_find_next(req); | |
5994 | if (linked_timeout) | |
5995 | io_queue_linked_timeout(linked_timeout); | |
5996 | ||
4a0a7a18 JA |
5997 | if (nxt) { |
5998 | req = nxt; | |
86a761f8 PB |
5999 | |
6000 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6001 | goto punt; | |
4a0a7a18 JA |
6002 | goto again; |
6003 | } | |
4bc4494e | 6004 | exit: |
193155c8 JA |
6005 | if (old_creds) |
6006 | revert_creds(old_creds); | |
2b188cc1 JA |
6007 | } |
6008 | ||
f13fad7b JA |
6009 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6010 | struct io_comp_state *cs) | |
4fe2c963 JL |
6011 | { |
6012 | int ret; | |
6013 | ||
3529d8c2 | 6014 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6015 | if (ret) { |
6016 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6017 | fail_req: |
4e88d6e7 | 6018 | req_set_fail_links(req); |
e1e16097 JA |
6019 | io_put_req(req); |
6020 | io_req_complete(req, ret); | |
4fe2c963 | 6021 | } |
2550878f | 6022 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a | 6023 | if (!req->io) { |
debb85f4 | 6024 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6025 | if (unlikely(ret)) |
bd2ab18a PB |
6026 | goto fail_req; |
6027 | } | |
6028 | ||
ce35a47a JA |
6029 | /* |
6030 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6031 | * to async execution. | |
6032 | */ | |
3e863ea3 | 6033 | io_req_init_async(req); |
ce35a47a JA |
6034 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6035 | io_queue_async_work(req); | |
6036 | } else { | |
f13fad7b | 6037 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 6038 | } |
4fe2c963 JL |
6039 | } |
6040 | ||
f13fad7b JA |
6041 | static inline void io_queue_link_head(struct io_kiocb *req, |
6042 | struct io_comp_state *cs) | |
4fe2c963 | 6043 | { |
94ae5e77 | 6044 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6045 | io_put_req(req); |
6046 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6047 | } else |
f13fad7b | 6048 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6049 | } |
6050 | ||
1d4240cc | 6051 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6052 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6053 | { |
a197f664 | 6054 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6055 | int ret; |
9e645e11 | 6056 | |
9e645e11 JA |
6057 | /* |
6058 | * If we already have a head request, queue this one for async | |
6059 | * submittal once the head completes. If we don't have a head but | |
6060 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6061 | * submitted sync once the chain is complete. If none of those | |
6062 | * conditions are true (normal request), then just queue it. | |
6063 | */ | |
6064 | if (*link) { | |
9d76377f | 6065 | struct io_kiocb *head = *link; |
4e88d6e7 | 6066 | |
8cdf2193 PB |
6067 | /* |
6068 | * Taking sequential execution of a link, draining both sides | |
6069 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6070 | * requests in the link. So, it drains the head and the | |
6071 | * next after the link request. The last one is done via | |
6072 | * drain_next flag to persist the effect across calls. | |
6073 | */ | |
ef4ff581 | 6074 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6075 | head->flags |= REQ_F_IO_DRAIN; |
6076 | ctx->drain_next = 1; | |
6077 | } | |
debb85f4 | 6078 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6079 | if (unlikely(ret)) { |
4e88d6e7 | 6080 | /* fail even hard links since we don't submit */ |
9d76377f | 6081 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6082 | return ret; |
2d28390a | 6083 | } |
9d76377f | 6084 | trace_io_uring_link(ctx, req, head); |
c40f6379 | 6085 | io_get_req_task(req); |
9d76377f | 6086 | list_add_tail(&req->link_list, &head->link_list); |
32fe525b PB |
6087 | |
6088 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6089 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6090 | io_queue_link_head(head, cs); |
32fe525b PB |
6091 | *link = NULL; |
6092 | } | |
9e645e11 | 6093 | } else { |
711be031 PB |
6094 | if (unlikely(ctx->drain_next)) { |
6095 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6096 | ctx->drain_next = 0; |
711be031 | 6097 | } |
ef4ff581 | 6098 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6099 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6100 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6101 | |
debb85f4 | 6102 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6103 | if (unlikely(ret)) |
711be031 PB |
6104 | req->flags |= REQ_F_FAIL_LINK; |
6105 | *link = req; | |
6106 | } else { | |
f13fad7b | 6107 | io_queue_sqe(req, sqe, cs); |
711be031 | 6108 | } |
9e645e11 | 6109 | } |
2e6e1fde | 6110 | |
1d4240cc | 6111 | return 0; |
9e645e11 JA |
6112 | } |
6113 | ||
9a56a232 JA |
6114 | /* |
6115 | * Batched submission is done, ensure local IO is flushed out. | |
6116 | */ | |
6117 | static void io_submit_state_end(struct io_submit_state *state) | |
6118 | { | |
f13fad7b JA |
6119 | if (!list_empty(&state->comp.list)) |
6120 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6121 | blk_finish_plug(&state->plug); |
9f13c35b | 6122 | io_state_file_put(state); |
2579f913 | 6123 | if (state->free_reqs) |
6c8a3134 | 6124 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6125 | } |
6126 | ||
6127 | /* | |
6128 | * Start submission side cache. | |
6129 | */ | |
6130 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6131 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6132 | { |
6133 | blk_start_plug(&state->plug); | |
b63534c4 JA |
6134 | #ifdef CONFIG_BLOCK |
6135 | state->plug.nowait = true; | |
6136 | #endif | |
013538bd JA |
6137 | state->comp.nr = 0; |
6138 | INIT_LIST_HEAD(&state->comp.list); | |
6139 | state->comp.ctx = ctx; | |
2579f913 | 6140 | state->free_reqs = 0; |
9a56a232 JA |
6141 | state->file = NULL; |
6142 | state->ios_left = max_ios; | |
6143 | } | |
6144 | ||
2b188cc1 JA |
6145 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6146 | { | |
75b28aff | 6147 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6148 | |
caf582c6 PB |
6149 | /* |
6150 | * Ensure any loads from the SQEs are done at this point, | |
6151 | * since once we write the new head, the application could | |
6152 | * write new data to them. | |
6153 | */ | |
6154 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6155 | } |
6156 | ||
2b188cc1 | 6157 | /* |
3529d8c2 | 6158 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6159 | * that is mapped by userspace. This means that care needs to be taken to |
6160 | * ensure that reads are stable, as we cannot rely on userspace always | |
6161 | * being a good citizen. If members of the sqe are validated and then later | |
6162 | * used, it's important that those reads are done through READ_ONCE() to | |
6163 | * prevent a re-load down the line. | |
6164 | */ | |
709b302f | 6165 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6166 | { |
75b28aff | 6167 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6168 | unsigned head; |
6169 | ||
6170 | /* | |
6171 | * The cached sq head (or cq tail) serves two purposes: | |
6172 | * | |
6173 | * 1) allows us to batch the cost of updating the user visible | |
6174 | * head updates. | |
6175 | * 2) allows the kernel side to track the head on its own, even | |
6176 | * though the application is the one updating it. | |
6177 | */ | |
ee7d46d9 | 6178 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6179 | if (likely(head < ctx->sq_entries)) |
6180 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6181 | |
6182 | /* drop invalid entries */ | |
498ccd9e | 6183 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6184 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6185 | return NULL; |
6186 | } | |
6187 | ||
6188 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6189 | { | |
6190 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6191 | } |
6192 | ||
ef4ff581 PB |
6193 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6194 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6195 | IOSQE_BUFFER_SELECT) | |
6196 | ||
6197 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6198 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6199 | struct io_submit_state *state) |
0553b8bd | 6200 | { |
ef4ff581 | 6201 | unsigned int sqe_flags; |
63ff8223 | 6202 | int id; |
ef4ff581 | 6203 | |
0553b8bd PB |
6204 | req->opcode = READ_ONCE(sqe->opcode); |
6205 | req->user_data = READ_ONCE(sqe->user_data); | |
6206 | req->io = NULL; | |
6207 | req->file = NULL; | |
6208 | req->ctx = ctx; | |
6209 | req->flags = 0; | |
6210 | /* one is dropped after submission, the other at completion */ | |
6211 | refcount_set(&req->refs, 2); | |
4dd2824d | 6212 | req->task = current; |
0553b8bd | 6213 | req->result = 0; |
ef4ff581 PB |
6214 | |
6215 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6216 | return -EINVAL; | |
6217 | ||
9d8426a0 JA |
6218 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6219 | return -EFAULT; | |
ef4ff581 PB |
6220 | |
6221 | sqe_flags = READ_ONCE(sqe->flags); | |
6222 | /* enforce forwards compatibility on users */ | |
6223 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6224 | return -EINVAL; | |
6225 | ||
6226 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6227 | !io_op_defs[req->opcode].buffer_select) | |
6228 | return -EOPNOTSUPP; | |
6229 | ||
6230 | id = READ_ONCE(sqe->personality); | |
6231 | if (id) { | |
7cdaf587 | 6232 | io_req_init_async(req); |
ef4ff581 PB |
6233 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6234 | if (unlikely(!req->work.creds)) | |
6235 | return -EINVAL; | |
6236 | get_cred(req->work.creds); | |
6237 | } | |
6238 | ||
6239 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6240 | req->flags |= sqe_flags; |
ef4ff581 | 6241 | |
63ff8223 JA |
6242 | if (!io_op_defs[req->opcode].needs_file) |
6243 | return 0; | |
6244 | ||
6245 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6246 | } |
6247 | ||
fb5ccc98 | 6248 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 6249 | struct file *ring_file, int ring_fd) |
6c271ce2 | 6250 | { |
ac8691c4 | 6251 | struct io_submit_state state; |
9e645e11 | 6252 | struct io_kiocb *link = NULL; |
9e645e11 | 6253 | int i, submitted = 0; |
6c271ce2 | 6254 | |
c4a2ed72 | 6255 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6256 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6257 | if (!list_empty(&ctx->cq_overflow_list) && | |
6258 | !io_cqring_overflow_flush(ctx, false)) | |
6259 | return -EBUSY; | |
6260 | } | |
6c271ce2 | 6261 | |
ee7d46d9 PB |
6262 | /* make sure SQ entry isn't read before tail */ |
6263 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6264 | |
2b85edfc PB |
6265 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6266 | return -EAGAIN; | |
6c271ce2 | 6267 | |
013538bd | 6268 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 | 6269 | |
b14cca0c PB |
6270 | ctx->ring_fd = ring_fd; |
6271 | ctx->ring_file = ring_file; | |
6272 | ||
6c271ce2 | 6273 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6274 | const struct io_uring_sqe *sqe; |
196be95c | 6275 | struct io_kiocb *req; |
1cb1edb2 | 6276 | int err; |
fb5ccc98 | 6277 | |
b1e50e54 PB |
6278 | sqe = io_get_sqe(ctx); |
6279 | if (unlikely(!sqe)) { | |
6280 | io_consume_sqe(ctx); | |
6281 | break; | |
6282 | } | |
ac8691c4 | 6283 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6284 | if (unlikely(!req)) { |
6285 | if (!submitted) | |
6286 | submitted = -EAGAIN; | |
fb5ccc98 | 6287 | break; |
196be95c | 6288 | } |
fb5ccc98 | 6289 | |
ac8691c4 | 6290 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6291 | io_consume_sqe(ctx); |
d3656344 JA |
6292 | /* will complete beyond this point, count as submitted */ |
6293 | submitted++; | |
6294 | ||
ef4ff581 | 6295 | if (unlikely(err)) { |
1cb1edb2 | 6296 | fail_req: |
e1e16097 JA |
6297 | io_put_req(req); |
6298 | io_req_complete(req, err); | |
196be95c PB |
6299 | break; |
6300 | } | |
fb5ccc98 | 6301 | |
354420f7 | 6302 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6303 | true, io_async_submit(ctx)); |
f13fad7b | 6304 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6305 | if (err) |
6306 | goto fail_req; | |
6c271ce2 JA |
6307 | } |
6308 | ||
9466f437 PB |
6309 | if (unlikely(submitted != nr)) { |
6310 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6311 | ||
6312 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6313 | } | |
9e645e11 | 6314 | if (link) |
f13fad7b | 6315 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6316 | io_submit_state_end(&state); |
6c271ce2 | 6317 | |
ae9428ca PB |
6318 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6319 | io_commit_sqring(ctx); | |
6320 | ||
6c271ce2 JA |
6321 | return submitted; |
6322 | } | |
6323 | ||
6324 | static int io_sq_thread(void *data) | |
6325 | { | |
6c271ce2 | 6326 | struct io_ring_ctx *ctx = data; |
181e448d | 6327 | const struct cred *old_cred; |
6c271ce2 | 6328 | DEFINE_WAIT(wait); |
6c271ce2 | 6329 | unsigned long timeout; |
bdcd3eab | 6330 | int ret = 0; |
6c271ce2 | 6331 | |
0f158b4c | 6332 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6333 | |
181e448d | 6334 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6335 | |
bdcd3eab | 6336 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6337 | while (!kthread_should_park()) { |
fb5ccc98 | 6338 | unsigned int to_submit; |
6c271ce2 | 6339 | |
540e32a0 | 6340 | if (!list_empty(&ctx->iopoll_list)) { |
6c271ce2 JA |
6341 | unsigned nr_events = 0; |
6342 | ||
bdcd3eab | 6343 | mutex_lock(&ctx->uring_lock); |
540e32a0 | 6344 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) |
9dedd563 | 6345 | io_do_iopoll(ctx, &nr_events, 0); |
bdcd3eab | 6346 | else |
6c271ce2 | 6347 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6348 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6349 | } |
6350 | ||
fb5ccc98 | 6351 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6352 | |
6353 | /* | |
6354 | * If submit got -EBUSY, flag us as needing the application | |
6355 | * to enter the kernel to reap and flush events. | |
6356 | */ | |
b772f07a | 6357 | if (!to_submit || ret == -EBUSY || need_resched()) { |
7143b5ac SG |
6358 | /* |
6359 | * Drop cur_mm before scheduling, we can't hold it for | |
6360 | * long periods (or over schedule()). Do this before | |
6361 | * adding ourselves to the waitqueue, as the unuse/drop | |
6362 | * may sleep. | |
6363 | */ | |
4349f30e | 6364 | io_sq_thread_drop_mm(); |
7143b5ac | 6365 | |
6c271ce2 JA |
6366 | /* |
6367 | * We're polling. If we're within the defined idle | |
6368 | * period, then let us spin without work before going | |
c1edbf5f JA |
6369 | * to sleep. The exception is if we got EBUSY doing |
6370 | * more IO, we should wait for the application to | |
6371 | * reap events and wake us up. | |
6c271ce2 | 6372 | */ |
540e32a0 | 6373 | if (!list_empty(&ctx->iopoll_list) || need_resched() || |
df069d80 JA |
6374 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6375 | !percpu_ref_is_dying(&ctx->refs))) { | |
4c6e277c | 6376 | io_run_task_work(); |
9831a90c | 6377 | cond_resched(); |
6c271ce2 JA |
6378 | continue; |
6379 | } | |
6380 | ||
6c271ce2 JA |
6381 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6382 | TASK_INTERRUPTIBLE); | |
6383 | ||
bdcd3eab XW |
6384 | /* |
6385 | * While doing polled IO, before going to sleep, we need | |
540e32a0 PB |
6386 | * to check if there are new reqs added to iopoll_list, |
6387 | * it is because reqs may have been punted to io worker | |
6388 | * and will be added to iopoll_list later, hence check | |
6389 | * the iopoll_list again. | |
bdcd3eab XW |
6390 | */ |
6391 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
540e32a0 | 6392 | !list_empty_careful(&ctx->iopoll_list)) { |
bdcd3eab XW |
6393 | finish_wait(&ctx->sqo_wait, &wait); |
6394 | continue; | |
6395 | } | |
6396 | ||
6c271ce2 | 6397 | /* Tell userspace we may need a wakeup call */ |
6d5f9049 | 6398 | spin_lock_irq(&ctx->completion_lock); |
75b28aff | 6399 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
6d5f9049 | 6400 | spin_unlock_irq(&ctx->completion_lock); |
6c271ce2 | 6401 | |
fb5ccc98 | 6402 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6403 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6404 | if (kthread_should_park()) { |
6c271ce2 JA |
6405 | finish_wait(&ctx->sqo_wait, &wait); |
6406 | break; | |
6407 | } | |
4c6e277c | 6408 | if (io_run_task_work()) { |
10bea96d | 6409 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
6410 | continue; |
6411 | } | |
6c271ce2 JA |
6412 | if (signal_pending(current)) |
6413 | flush_signals(current); | |
6414 | schedule(); | |
6415 | finish_wait(&ctx->sqo_wait, &wait); | |
6416 | ||
6d5f9049 | 6417 | spin_lock_irq(&ctx->completion_lock); |
75b28aff | 6418 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6d5f9049 | 6419 | spin_unlock_irq(&ctx->completion_lock); |
d4ae271d | 6420 | ret = 0; |
6c271ce2 JA |
6421 | continue; |
6422 | } | |
6423 | finish_wait(&ctx->sqo_wait, &wait); | |
6424 | ||
6d5f9049 | 6425 | spin_lock_irq(&ctx->completion_lock); |
75b28aff | 6426 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6d5f9049 | 6427 | spin_unlock_irq(&ctx->completion_lock); |
6c271ce2 JA |
6428 | } |
6429 | ||
8a4955ff | 6430 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6431 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6432 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6433 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6434 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6435 | } |
6436 | ||
4c6e277c | 6437 | io_run_task_work(); |
b41e9852 | 6438 | |
4349f30e | 6439 | io_sq_thread_drop_mm(); |
181e448d | 6440 | revert_creds(old_cred); |
06058632 | 6441 | |
2bbcd6d3 | 6442 | kthread_parkme(); |
06058632 | 6443 | |
6c271ce2 JA |
6444 | return 0; |
6445 | } | |
6446 | ||
bda52162 JA |
6447 | struct io_wait_queue { |
6448 | struct wait_queue_entry wq; | |
6449 | struct io_ring_ctx *ctx; | |
6450 | unsigned to_wait; | |
6451 | unsigned nr_timeouts; | |
6452 | }; | |
6453 | ||
1d7bb1d5 | 6454 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6455 | { |
6456 | struct io_ring_ctx *ctx = iowq->ctx; | |
6457 | ||
6458 | /* | |
d195a66e | 6459 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6460 | * started waiting. For timeouts, we always want to return to userspace, |
6461 | * regardless of event count. | |
6462 | */ | |
1d7bb1d5 | 6463 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6464 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6465 | } | |
6466 | ||
6467 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6468 | int wake_flags, void *key) | |
6469 | { | |
6470 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6471 | wq); | |
6472 | ||
1d7bb1d5 JA |
6473 | /* use noflush == true, as we can't safely rely on locking context */ |
6474 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6475 | return -1; |
6476 | ||
6477 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6478 | } | |
6479 | ||
2b188cc1 JA |
6480 | /* |
6481 | * Wait until events become available, if we don't already have some. The | |
6482 | * application must reap them itself, as they reside on the shared cq ring. | |
6483 | */ | |
6484 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6485 | const sigset_t __user *sig, size_t sigsz) | |
6486 | { | |
bda52162 JA |
6487 | struct io_wait_queue iowq = { |
6488 | .wq = { | |
6489 | .private = current, | |
6490 | .func = io_wake_function, | |
6491 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6492 | }, | |
6493 | .ctx = ctx, | |
6494 | .to_wait = min_events, | |
6495 | }; | |
75b28aff | 6496 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6497 | int ret = 0; |
2b188cc1 | 6498 | |
b41e9852 JA |
6499 | do { |
6500 | if (io_cqring_events(ctx, false) >= min_events) | |
6501 | return 0; | |
4c6e277c | 6502 | if (!io_run_task_work()) |
b41e9852 | 6503 | break; |
b41e9852 | 6504 | } while (1); |
2b188cc1 JA |
6505 | |
6506 | if (sig) { | |
9e75ad5d AB |
6507 | #ifdef CONFIG_COMPAT |
6508 | if (in_compat_syscall()) | |
6509 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6510 | sigsz); |
9e75ad5d AB |
6511 | else |
6512 | #endif | |
b772434b | 6513 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6514 | |
2b188cc1 JA |
6515 | if (ret) |
6516 | return ret; | |
6517 | } | |
6518 | ||
bda52162 | 6519 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6520 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6521 | do { |
6522 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6523 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6524 | /* make sure we run task_work before checking for signals */ |
4c6e277c JA |
6525 | if (io_run_task_work()) |
6526 | continue; | |
bda52162 | 6527 | if (signal_pending(current)) { |
b7db41c9 JA |
6528 | if (current->jobctl & JOBCTL_TASK_WORK) { |
6529 | spin_lock_irq(¤t->sighand->siglock); | |
6530 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6531 | recalc_sigpending(); | |
6532 | spin_unlock_irq(¤t->sighand->siglock); | |
6533 | continue; | |
6534 | } | |
e9ffa5c2 | 6535 | ret = -EINTR; |
bda52162 JA |
6536 | break; |
6537 | } | |
ce593a6c JA |
6538 | if (io_should_wake(&iowq, false)) |
6539 | break; | |
6540 | schedule(); | |
bda52162 JA |
6541 | } while (1); |
6542 | finish_wait(&ctx->wait, &iowq.wq); | |
6543 | ||
e9ffa5c2 | 6544 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6545 | |
75b28aff | 6546 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6547 | } |
6548 | ||
6b06314c JA |
6549 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6550 | { | |
6551 | #if defined(CONFIG_UNIX) | |
6552 | if (ctx->ring_sock) { | |
6553 | struct sock *sock = ctx->ring_sock->sk; | |
6554 | struct sk_buff *skb; | |
6555 | ||
6556 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6557 | kfree_skb(skb); | |
6558 | } | |
6559 | #else | |
6560 | int i; | |
6561 | ||
65e19f54 JA |
6562 | for (i = 0; i < ctx->nr_user_files; i++) { |
6563 | struct file *file; | |
6564 | ||
6565 | file = io_file_from_index(ctx, i); | |
6566 | if (file) | |
6567 | fput(file); | |
6568 | } | |
6b06314c JA |
6569 | #endif |
6570 | } | |
6571 | ||
05f3fb3c JA |
6572 | static void io_file_ref_kill(struct percpu_ref *ref) |
6573 | { | |
6574 | struct fixed_file_data *data; | |
6575 | ||
6576 | data = container_of(ref, struct fixed_file_data, refs); | |
6577 | complete(&data->done); | |
6578 | } | |
6579 | ||
6b06314c JA |
6580 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6581 | { | |
05f3fb3c | 6582 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6583 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6584 | unsigned nr_tables, i; |
6585 | ||
05f3fb3c | 6586 | if (!data) |
6b06314c JA |
6587 | return -ENXIO; |
6588 | ||
6a4d07cd | 6589 | spin_lock(&data->lock); |
05589553 XW |
6590 | if (!list_empty(&data->ref_list)) |
6591 | ref_node = list_first_entry(&data->ref_list, | |
6592 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6593 | spin_unlock(&data->lock); |
05589553 XW |
6594 | if (ref_node) |
6595 | percpu_ref_kill(&ref_node->refs); | |
6596 | ||
6597 | percpu_ref_kill(&data->refs); | |
6598 | ||
6599 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6600 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6601 | wait_for_completion(&data->done); |
05f3fb3c | 6602 | |
6b06314c | 6603 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6604 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6605 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6606 | kfree(data->table[i].files); |
6607 | kfree(data->table); | |
05589553 XW |
6608 | percpu_ref_exit(&data->refs); |
6609 | kfree(data); | |
05f3fb3c | 6610 | ctx->file_data = NULL; |
6b06314c JA |
6611 | ctx->nr_user_files = 0; |
6612 | return 0; | |
6613 | } | |
6614 | ||
6c271ce2 JA |
6615 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6616 | { | |
6617 | if (ctx->sqo_thread) { | |
0f158b4c | 6618 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6619 | /* |
6620 | * The park is a bit of a work-around, without it we get | |
6621 | * warning spews on shutdown with SQPOLL set and affinity | |
6622 | * set to a single CPU. | |
6623 | */ | |
06058632 | 6624 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6625 | kthread_stop(ctx->sqo_thread); |
6626 | ctx->sqo_thread = NULL; | |
6627 | } | |
6628 | } | |
6629 | ||
6b06314c JA |
6630 | static void io_finish_async(struct io_ring_ctx *ctx) |
6631 | { | |
6c271ce2 JA |
6632 | io_sq_thread_stop(ctx); |
6633 | ||
561fb04a JA |
6634 | if (ctx->io_wq) { |
6635 | io_wq_destroy(ctx->io_wq); | |
6636 | ctx->io_wq = NULL; | |
6b06314c JA |
6637 | } |
6638 | } | |
6639 | ||
6640 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6641 | /* |
6642 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6643 | * the io_uring can be safely unregistered on process exit, even if we have | |
6644 | * loops in the file referencing. | |
6645 | */ | |
6646 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6647 | { | |
6648 | struct sock *sk = ctx->ring_sock->sk; | |
6649 | struct scm_fp_list *fpl; | |
6650 | struct sk_buff *skb; | |
08a45173 | 6651 | int i, nr_files; |
6b06314c | 6652 | |
6b06314c JA |
6653 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6654 | if (!fpl) | |
6655 | return -ENOMEM; | |
6656 | ||
6657 | skb = alloc_skb(0, GFP_KERNEL); | |
6658 | if (!skb) { | |
6659 | kfree(fpl); | |
6660 | return -ENOMEM; | |
6661 | } | |
6662 | ||
6663 | skb->sk = sk; | |
6b06314c | 6664 | |
08a45173 | 6665 | nr_files = 0; |
6b06314c JA |
6666 | fpl->user = get_uid(ctx->user); |
6667 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6668 | struct file *file = io_file_from_index(ctx, i + offset); |
6669 | ||
6670 | if (!file) | |
08a45173 | 6671 | continue; |
65e19f54 | 6672 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6673 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6674 | nr_files++; | |
6b06314c JA |
6675 | } |
6676 | ||
08a45173 JA |
6677 | if (nr_files) { |
6678 | fpl->max = SCM_MAX_FD; | |
6679 | fpl->count = nr_files; | |
6680 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6681 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6682 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6683 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6684 | |
08a45173 JA |
6685 | for (i = 0; i < nr_files; i++) |
6686 | fput(fpl->fp[i]); | |
6687 | } else { | |
6688 | kfree_skb(skb); | |
6689 | kfree(fpl); | |
6690 | } | |
6b06314c JA |
6691 | |
6692 | return 0; | |
6693 | } | |
6694 | ||
6695 | /* | |
6696 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6697 | * causes regular reference counting to break down. We rely on the UNIX | |
6698 | * garbage collection to take care of this problem for us. | |
6699 | */ | |
6700 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6701 | { | |
6702 | unsigned left, total; | |
6703 | int ret = 0; | |
6704 | ||
6705 | total = 0; | |
6706 | left = ctx->nr_user_files; | |
6707 | while (left) { | |
6708 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6709 | |
6710 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6711 | if (ret) | |
6712 | break; | |
6713 | left -= this_files; | |
6714 | total += this_files; | |
6715 | } | |
6716 | ||
6717 | if (!ret) | |
6718 | return 0; | |
6719 | ||
6720 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6721 | struct file *file = io_file_from_index(ctx, total); |
6722 | ||
6723 | if (file) | |
6724 | fput(file); | |
6b06314c JA |
6725 | total++; |
6726 | } | |
6727 | ||
6728 | return ret; | |
6729 | } | |
6730 | #else | |
6731 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6732 | { | |
6733 | return 0; | |
6734 | } | |
6735 | #endif | |
6736 | ||
65e19f54 JA |
6737 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6738 | unsigned nr_files) | |
6739 | { | |
6740 | int i; | |
6741 | ||
6742 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6743 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6744 | unsigned this_files; |
6745 | ||
6746 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6747 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6748 | GFP_KERNEL); | |
6749 | if (!table->files) | |
6750 | break; | |
6751 | nr_files -= this_files; | |
6752 | } | |
6753 | ||
6754 | if (i == nr_tables) | |
6755 | return 0; | |
6756 | ||
6757 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6758 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6759 | kfree(table->files); |
6760 | } | |
6761 | return 1; | |
6762 | } | |
6763 | ||
05f3fb3c JA |
6764 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6765 | { | |
6766 | #if defined(CONFIG_UNIX) | |
6767 | struct sock *sock = ctx->ring_sock->sk; | |
6768 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6769 | struct sk_buff *skb; | |
6770 | int i; | |
6771 | ||
6772 | __skb_queue_head_init(&list); | |
6773 | ||
6774 | /* | |
6775 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6776 | * remove this entry and rearrange the file array. | |
6777 | */ | |
6778 | skb = skb_dequeue(head); | |
6779 | while (skb) { | |
6780 | struct scm_fp_list *fp; | |
6781 | ||
6782 | fp = UNIXCB(skb).fp; | |
6783 | for (i = 0; i < fp->count; i++) { | |
6784 | int left; | |
6785 | ||
6786 | if (fp->fp[i] != file) | |
6787 | continue; | |
6788 | ||
6789 | unix_notinflight(fp->user, fp->fp[i]); | |
6790 | left = fp->count - 1 - i; | |
6791 | if (left) { | |
6792 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6793 | left * sizeof(struct file *)); | |
6794 | } | |
6795 | fp->count--; | |
6796 | if (!fp->count) { | |
6797 | kfree_skb(skb); | |
6798 | skb = NULL; | |
6799 | } else { | |
6800 | __skb_queue_tail(&list, skb); | |
6801 | } | |
6802 | fput(file); | |
6803 | file = NULL; | |
6804 | break; | |
6805 | } | |
6806 | ||
6807 | if (!file) | |
6808 | break; | |
6809 | ||
6810 | __skb_queue_tail(&list, skb); | |
6811 | ||
6812 | skb = skb_dequeue(head); | |
6813 | } | |
6814 | ||
6815 | if (skb_peek(&list)) { | |
6816 | spin_lock_irq(&head->lock); | |
6817 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6818 | __skb_queue_tail(head, skb); | |
6819 | spin_unlock_irq(&head->lock); | |
6820 | } | |
6821 | #else | |
6822 | fput(file); | |
6823 | #endif | |
6824 | } | |
6825 | ||
6826 | struct io_file_put { | |
05589553 | 6827 | struct list_head list; |
05f3fb3c | 6828 | struct file *file; |
05f3fb3c JA |
6829 | }; |
6830 | ||
4a38aed2 | 6831 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6832 | { |
4a38aed2 JA |
6833 | struct fixed_file_data *file_data = ref_node->file_data; |
6834 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6835 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6836 | |
6837 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6838 | list_del(&pfile->list); |
05589553 XW |
6839 | io_ring_file_put(ctx, pfile->file); |
6840 | kfree(pfile); | |
65e19f54 | 6841 | } |
05589553 | 6842 | |
6a4d07cd JA |
6843 | spin_lock(&file_data->lock); |
6844 | list_del(&ref_node->node); | |
6845 | spin_unlock(&file_data->lock); | |
05589553 XW |
6846 | |
6847 | percpu_ref_exit(&ref_node->refs); | |
6848 | kfree(ref_node); | |
6849 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6850 | } |
65e19f54 | 6851 | |
4a38aed2 JA |
6852 | static void io_file_put_work(struct work_struct *work) |
6853 | { | |
6854 | struct io_ring_ctx *ctx; | |
6855 | struct llist_node *node; | |
6856 | ||
6857 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6858 | node = llist_del_all(&ctx->file_put_llist); | |
6859 | ||
6860 | while (node) { | |
6861 | struct fixed_file_ref_node *ref_node; | |
6862 | struct llist_node *next = node->next; | |
6863 | ||
6864 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6865 | __io_file_put_work(ref_node); | |
6866 | node = next; | |
6867 | } | |
6868 | } | |
6869 | ||
05589553 | 6870 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6871 | { |
05589553 | 6872 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6873 | struct io_ring_ctx *ctx; |
6874 | bool first_add; | |
6875 | int delay = HZ; | |
65e19f54 | 6876 | |
05589553 | 6877 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6878 | ctx = ref_node->file_data->ctx; |
05589553 | 6879 | |
4a38aed2 JA |
6880 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6881 | delay = 0; | |
05589553 | 6882 | |
4a38aed2 JA |
6883 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
6884 | if (!delay) | |
6885 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
6886 | else if (first_add) | |
6887 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 6888 | } |
65e19f54 | 6889 | |
05589553 XW |
6890 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6891 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6892 | { |
05589553 | 6893 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6894 | |
05589553 XW |
6895 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6896 | if (!ref_node) | |
6897 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6898 | |
05589553 XW |
6899 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6900 | 0, GFP_KERNEL)) { | |
6901 | kfree(ref_node); | |
6902 | return ERR_PTR(-ENOMEM); | |
6903 | } | |
6904 | INIT_LIST_HEAD(&ref_node->node); | |
6905 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
6906 | ref_node->file_data = ctx->file_data; |
6907 | return ref_node; | |
05589553 XW |
6908 | } |
6909 | ||
6910 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6911 | { | |
6912 | percpu_ref_exit(&ref_node->refs); | |
6913 | kfree(ref_node); | |
65e19f54 JA |
6914 | } |
6915 | ||
6b06314c JA |
6916 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6917 | unsigned nr_args) | |
6918 | { | |
6919 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6920 | unsigned nr_tables; |
05f3fb3c | 6921 | struct file *file; |
6b06314c JA |
6922 | int fd, ret = 0; |
6923 | unsigned i; | |
05589553 | 6924 | struct fixed_file_ref_node *ref_node; |
6b06314c | 6925 | |
05f3fb3c | 6926 | if (ctx->file_data) |
6b06314c JA |
6927 | return -EBUSY; |
6928 | if (!nr_args) | |
6929 | return -EINVAL; | |
6930 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6931 | return -EMFILE; | |
6932 | ||
05f3fb3c JA |
6933 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6934 | if (!ctx->file_data) | |
6935 | return -ENOMEM; | |
6936 | ctx->file_data->ctx = ctx; | |
6937 | init_completion(&ctx->file_data->done); | |
05589553 | 6938 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 6939 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 6940 | |
65e19f54 | 6941 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6942 | ctx->file_data->table = kcalloc(nr_tables, |
6943 | sizeof(struct fixed_file_table), | |
65e19f54 | 6944 | GFP_KERNEL); |
05f3fb3c JA |
6945 | if (!ctx->file_data->table) { |
6946 | kfree(ctx->file_data); | |
6947 | ctx->file_data = NULL; | |
6b06314c | 6948 | return -ENOMEM; |
05f3fb3c JA |
6949 | } |
6950 | ||
05589553 | 6951 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6952 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6953 | kfree(ctx->file_data->table); | |
6954 | kfree(ctx->file_data); | |
6955 | ctx->file_data = NULL; | |
6b06314c | 6956 | return -ENOMEM; |
05f3fb3c | 6957 | } |
6b06314c | 6958 | |
65e19f54 | 6959 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6960 | percpu_ref_exit(&ctx->file_data->refs); |
6961 | kfree(ctx->file_data->table); | |
6962 | kfree(ctx->file_data); | |
6963 | ctx->file_data = NULL; | |
65e19f54 JA |
6964 | return -ENOMEM; |
6965 | } | |
6966 | ||
08a45173 | 6967 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6968 | struct fixed_file_table *table; |
6969 | unsigned index; | |
6970 | ||
6b06314c JA |
6971 | ret = -EFAULT; |
6972 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6973 | break; | |
08a45173 JA |
6974 | /* allow sparse sets */ |
6975 | if (fd == -1) { | |
6976 | ret = 0; | |
6977 | continue; | |
6978 | } | |
6b06314c | 6979 | |
05f3fb3c | 6980 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6981 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6982 | file = fget(fd); |
6b06314c JA |
6983 | |
6984 | ret = -EBADF; | |
05f3fb3c | 6985 | if (!file) |
6b06314c | 6986 | break; |
05f3fb3c | 6987 | |
6b06314c JA |
6988 | /* |
6989 | * Don't allow io_uring instances to be registered. If UNIX | |
6990 | * isn't enabled, then this causes a reference cycle and this | |
6991 | * instance can never get freed. If UNIX is enabled we'll | |
6992 | * handle it just fine, but there's still no point in allowing | |
6993 | * a ring fd as it doesn't support regular read/write anyway. | |
6994 | */ | |
05f3fb3c JA |
6995 | if (file->f_op == &io_uring_fops) { |
6996 | fput(file); | |
6b06314c JA |
6997 | break; |
6998 | } | |
6b06314c | 6999 | ret = 0; |
05f3fb3c | 7000 | table->files[index] = file; |
6b06314c JA |
7001 | } |
7002 | ||
7003 | if (ret) { | |
65e19f54 | 7004 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
7005 | file = io_file_from_index(ctx, i); |
7006 | if (file) | |
7007 | fput(file); | |
7008 | } | |
7009 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7010 | kfree(ctx->file_data->table[i].files); |
6b06314c | 7011 | |
667e57da | 7012 | percpu_ref_exit(&ctx->file_data->refs); |
05f3fb3c JA |
7013 | kfree(ctx->file_data->table); |
7014 | kfree(ctx->file_data); | |
7015 | ctx->file_data = NULL; | |
6b06314c JA |
7016 | ctx->nr_user_files = 0; |
7017 | return ret; | |
7018 | } | |
7019 | ||
7020 | ret = io_sqe_files_scm(ctx); | |
05589553 | 7021 | if (ret) { |
6b06314c | 7022 | io_sqe_files_unregister(ctx); |
05589553 XW |
7023 | return ret; |
7024 | } | |
6b06314c | 7025 | |
05589553 XW |
7026 | ref_node = alloc_fixed_file_ref_node(ctx); |
7027 | if (IS_ERR(ref_node)) { | |
7028 | io_sqe_files_unregister(ctx); | |
7029 | return PTR_ERR(ref_node); | |
7030 | } | |
7031 | ||
7032 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7033 | spin_lock(&ctx->file_data->lock); |
05589553 | 7034 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 7035 | spin_unlock(&ctx->file_data->lock); |
05589553 | 7036 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
7037 | return ret; |
7038 | } | |
7039 | ||
c3a31e60 JA |
7040 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7041 | int index) | |
7042 | { | |
7043 | #if defined(CONFIG_UNIX) | |
7044 | struct sock *sock = ctx->ring_sock->sk; | |
7045 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7046 | struct sk_buff *skb; | |
7047 | ||
7048 | /* | |
7049 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7050 | * file set. If there's no room, fall back to allocating a new skb | |
7051 | * and filling it in. | |
7052 | */ | |
7053 | spin_lock_irq(&head->lock); | |
7054 | skb = skb_peek(head); | |
7055 | if (skb) { | |
7056 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7057 | ||
7058 | if (fpl->count < SCM_MAX_FD) { | |
7059 | __skb_unlink(skb, head); | |
7060 | spin_unlock_irq(&head->lock); | |
7061 | fpl->fp[fpl->count] = get_file(file); | |
7062 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7063 | fpl->count++; | |
7064 | spin_lock_irq(&head->lock); | |
7065 | __skb_queue_head(head, skb); | |
7066 | } else { | |
7067 | skb = NULL; | |
7068 | } | |
7069 | } | |
7070 | spin_unlock_irq(&head->lock); | |
7071 | ||
7072 | if (skb) { | |
7073 | fput(file); | |
7074 | return 0; | |
7075 | } | |
7076 | ||
7077 | return __io_sqe_files_scm(ctx, 1, index); | |
7078 | #else | |
7079 | return 0; | |
7080 | #endif | |
7081 | } | |
7082 | ||
a5318d3c | 7083 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7084 | struct file *file) |
05f3fb3c | 7085 | { |
a5318d3c | 7086 | struct io_file_put *pfile; |
05589553 XW |
7087 | struct percpu_ref *refs = data->cur_refs; |
7088 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7089 | |
05f3fb3c | 7090 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7091 | if (!pfile) |
7092 | return -ENOMEM; | |
05f3fb3c | 7093 | |
05589553 | 7094 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7095 | pfile->file = file; |
05589553 XW |
7096 | list_add(&pfile->list, &ref_node->file_list); |
7097 | ||
a5318d3c | 7098 | return 0; |
05f3fb3c JA |
7099 | } |
7100 | ||
7101 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7102 | struct io_uring_files_update *up, | |
7103 | unsigned nr_args) | |
7104 | { | |
7105 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7106 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7107 | struct file *file; |
c3a31e60 JA |
7108 | __s32 __user *fds; |
7109 | int fd, i, err; | |
7110 | __u32 done; | |
05589553 | 7111 | bool needs_switch = false; |
c3a31e60 | 7112 | |
05f3fb3c | 7113 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7114 | return -EOVERFLOW; |
7115 | if (done > ctx->nr_user_files) | |
7116 | return -EINVAL; | |
7117 | ||
05589553 XW |
7118 | ref_node = alloc_fixed_file_ref_node(ctx); |
7119 | if (IS_ERR(ref_node)) | |
7120 | return PTR_ERR(ref_node); | |
7121 | ||
c3a31e60 | 7122 | done = 0; |
05f3fb3c | 7123 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7124 | while (nr_args) { |
65e19f54 JA |
7125 | struct fixed_file_table *table; |
7126 | unsigned index; | |
7127 | ||
c3a31e60 JA |
7128 | err = 0; |
7129 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7130 | err = -EFAULT; | |
7131 | break; | |
7132 | } | |
05f3fb3c JA |
7133 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7134 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7135 | index = i & IORING_FILE_TABLE_MASK; |
7136 | if (table->files[index]) { | |
05f3fb3c | 7137 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
7138 | err = io_queue_file_removal(data, file); |
7139 | if (err) | |
7140 | break; | |
65e19f54 | 7141 | table->files[index] = NULL; |
05589553 | 7142 | needs_switch = true; |
c3a31e60 JA |
7143 | } |
7144 | if (fd != -1) { | |
c3a31e60 JA |
7145 | file = fget(fd); |
7146 | if (!file) { | |
7147 | err = -EBADF; | |
7148 | break; | |
7149 | } | |
7150 | /* | |
7151 | * Don't allow io_uring instances to be registered. If | |
7152 | * UNIX isn't enabled, then this causes a reference | |
7153 | * cycle and this instance can never get freed. If UNIX | |
7154 | * is enabled we'll handle it just fine, but there's | |
7155 | * still no point in allowing a ring fd as it doesn't | |
7156 | * support regular read/write anyway. | |
7157 | */ | |
7158 | if (file->f_op == &io_uring_fops) { | |
7159 | fput(file); | |
7160 | err = -EBADF; | |
7161 | break; | |
7162 | } | |
65e19f54 | 7163 | table->files[index] = file; |
c3a31e60 | 7164 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae YY |
7165 | if (err) { |
7166 | fput(file); | |
c3a31e60 | 7167 | break; |
f3bd9dae | 7168 | } |
c3a31e60 JA |
7169 | } |
7170 | nr_args--; | |
7171 | done++; | |
05f3fb3c JA |
7172 | up->offset++; |
7173 | } | |
7174 | ||
05589553 XW |
7175 | if (needs_switch) { |
7176 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7177 | spin_lock(&data->lock); |
05589553 XW |
7178 | list_add(&ref_node->node, &data->ref_list); |
7179 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7180 | spin_unlock(&data->lock); |
05589553 XW |
7181 | percpu_ref_get(&ctx->file_data->refs); |
7182 | } else | |
7183 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7184 | |
7185 | return done ? done : err; | |
7186 | } | |
05589553 | 7187 | |
05f3fb3c JA |
7188 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7189 | unsigned nr_args) | |
7190 | { | |
7191 | struct io_uring_files_update up; | |
7192 | ||
7193 | if (!ctx->file_data) | |
7194 | return -ENXIO; | |
7195 | if (!nr_args) | |
7196 | return -EINVAL; | |
7197 | if (copy_from_user(&up, arg, sizeof(up))) | |
7198 | return -EFAULT; | |
7199 | if (up.resv) | |
7200 | return -EINVAL; | |
7201 | ||
7202 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7203 | } | |
c3a31e60 | 7204 | |
e9fd9396 | 7205 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7206 | { |
7207 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7208 | ||
e9fd9396 | 7209 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7210 | io_put_req(req); |
7211 | } | |
7212 | ||
24369c2e PB |
7213 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7214 | struct io_uring_params *p) | |
7215 | { | |
7216 | struct io_wq_data data; | |
7217 | struct fd f; | |
7218 | struct io_ring_ctx *ctx_attach; | |
7219 | unsigned int concurrency; | |
7220 | int ret = 0; | |
7221 | ||
7222 | data.user = ctx->user; | |
e9fd9396 | 7223 | data.free_work = io_free_work; |
f5fa38c5 | 7224 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7225 | |
7226 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7227 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7228 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7229 | ||
7230 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7231 | if (IS_ERR(ctx->io_wq)) { | |
7232 | ret = PTR_ERR(ctx->io_wq); | |
7233 | ctx->io_wq = NULL; | |
7234 | } | |
7235 | return ret; | |
7236 | } | |
7237 | ||
7238 | f = fdget(p->wq_fd); | |
7239 | if (!f.file) | |
7240 | return -EBADF; | |
7241 | ||
7242 | if (f.file->f_op != &io_uring_fops) { | |
7243 | ret = -EINVAL; | |
7244 | goto out_fput; | |
7245 | } | |
7246 | ||
7247 | ctx_attach = f.file->private_data; | |
7248 | /* @io_wq is protected by holding the fd */ | |
7249 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7250 | ret = -EINVAL; | |
7251 | goto out_fput; | |
7252 | } | |
7253 | ||
7254 | ctx->io_wq = ctx_attach->io_wq; | |
7255 | out_fput: | |
7256 | fdput(f); | |
7257 | return ret; | |
7258 | } | |
7259 | ||
6c271ce2 JA |
7260 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7261 | struct io_uring_params *p) | |
2b188cc1 JA |
7262 | { |
7263 | int ret; | |
7264 | ||
6c271ce2 | 7265 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
8eb06d7e PB |
7266 | mmgrab(current->mm); |
7267 | ctx->sqo_mm = current->mm; | |
7268 | ||
3ec482d1 JA |
7269 | ret = -EPERM; |
7270 | if (!capable(CAP_SYS_ADMIN)) | |
7271 | goto err; | |
7272 | ||
917257da JA |
7273 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7274 | if (!ctx->sq_thread_idle) | |
7275 | ctx->sq_thread_idle = HZ; | |
7276 | ||
6c271ce2 | 7277 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7278 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7279 | |
917257da | 7280 | ret = -EINVAL; |
44a9bd18 JA |
7281 | if (cpu >= nr_cpu_ids) |
7282 | goto err; | |
7889f44d | 7283 | if (!cpu_online(cpu)) |
917257da JA |
7284 | goto err; |
7285 | ||
6c271ce2 JA |
7286 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7287 | ctx, cpu, | |
7288 | "io_uring-sq"); | |
7289 | } else { | |
7290 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7291 | "io_uring-sq"); | |
7292 | } | |
7293 | if (IS_ERR(ctx->sqo_thread)) { | |
7294 | ret = PTR_ERR(ctx->sqo_thread); | |
7295 | ctx->sqo_thread = NULL; | |
7296 | goto err; | |
7297 | } | |
7298 | wake_up_process(ctx->sqo_thread); | |
7299 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7300 | /* Can't have SQ_AFF without SQPOLL */ | |
7301 | ret = -EINVAL; | |
7302 | goto err; | |
7303 | } | |
7304 | ||
24369c2e PB |
7305 | ret = io_init_wq_offload(ctx, p); |
7306 | if (ret) | |
2b188cc1 | 7307 | goto err; |
2b188cc1 JA |
7308 | |
7309 | return 0; | |
7310 | err: | |
54a91f3b | 7311 | io_finish_async(ctx); |
8eb06d7e PB |
7312 | if (ctx->sqo_mm) { |
7313 | mmdrop(ctx->sqo_mm); | |
7314 | ctx->sqo_mm = NULL; | |
7315 | } | |
2b188cc1 JA |
7316 | return ret; |
7317 | } | |
7318 | ||
a087e2b5 BM |
7319 | static inline void __io_unaccount_mem(struct user_struct *user, |
7320 | unsigned long nr_pages) | |
2b188cc1 JA |
7321 | { |
7322 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7323 | } | |
7324 | ||
a087e2b5 BM |
7325 | static inline int __io_account_mem(struct user_struct *user, |
7326 | unsigned long nr_pages) | |
2b188cc1 JA |
7327 | { |
7328 | unsigned long page_limit, cur_pages, new_pages; | |
7329 | ||
7330 | /* Don't allow more pages than we can safely lock */ | |
7331 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7332 | ||
7333 | do { | |
7334 | cur_pages = atomic_long_read(&user->locked_vm); | |
7335 | new_pages = cur_pages + nr_pages; | |
7336 | if (new_pages > page_limit) | |
7337 | return -ENOMEM; | |
7338 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7339 | new_pages) != cur_pages); | |
7340 | ||
7341 | return 0; | |
7342 | } | |
7343 | ||
2e0464d4 BM |
7344 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7345 | enum io_mem_account acct) | |
a087e2b5 | 7346 | { |
aad5d8da | 7347 | if (ctx->limit_mem) |
a087e2b5 | 7348 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7349 | |
2e0464d4 BM |
7350 | if (ctx->sqo_mm) { |
7351 | if (acct == ACCT_LOCKED) | |
7352 | ctx->sqo_mm->locked_vm -= nr_pages; | |
7353 | else if (acct == ACCT_PINNED) | |
7354 | atomic64_sub(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7355 | } | |
a087e2b5 BM |
7356 | } |
7357 | ||
2e0464d4 BM |
7358 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7359 | enum io_mem_account acct) | |
a087e2b5 | 7360 | { |
30975825 BM |
7361 | int ret; |
7362 | ||
7363 | if (ctx->limit_mem) { | |
7364 | ret = __io_account_mem(ctx->user, nr_pages); | |
7365 | if (ret) | |
7366 | return ret; | |
7367 | } | |
7368 | ||
2e0464d4 BM |
7369 | if (ctx->sqo_mm) { |
7370 | if (acct == ACCT_LOCKED) | |
7371 | ctx->sqo_mm->locked_vm += nr_pages; | |
7372 | else if (acct == ACCT_PINNED) | |
7373 | atomic64_add(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7374 | } | |
a087e2b5 BM |
7375 | |
7376 | return 0; | |
7377 | } | |
7378 | ||
2b188cc1 JA |
7379 | static void io_mem_free(void *ptr) |
7380 | { | |
52e04ef4 MR |
7381 | struct page *page; |
7382 | ||
7383 | if (!ptr) | |
7384 | return; | |
2b188cc1 | 7385 | |
52e04ef4 | 7386 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7387 | if (put_page_testzero(page)) |
7388 | free_compound_page(page); | |
7389 | } | |
7390 | ||
7391 | static void *io_mem_alloc(size_t size) | |
7392 | { | |
7393 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7394 | __GFP_NORETRY; | |
7395 | ||
7396 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7397 | } | |
7398 | ||
75b28aff HV |
7399 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7400 | size_t *sq_offset) | |
7401 | { | |
7402 | struct io_rings *rings; | |
7403 | size_t off, sq_array_size; | |
7404 | ||
7405 | off = struct_size(rings, cqes, cq_entries); | |
7406 | if (off == SIZE_MAX) | |
7407 | return SIZE_MAX; | |
7408 | ||
7409 | #ifdef CONFIG_SMP | |
7410 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7411 | if (off == 0) | |
7412 | return SIZE_MAX; | |
7413 | #endif | |
7414 | ||
b36200f5 DV |
7415 | if (sq_offset) |
7416 | *sq_offset = off; | |
7417 | ||
75b28aff HV |
7418 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7419 | if (sq_array_size == SIZE_MAX) | |
7420 | return SIZE_MAX; | |
7421 | ||
7422 | if (check_add_overflow(off, sq_array_size, &off)) | |
7423 | return SIZE_MAX; | |
7424 | ||
75b28aff HV |
7425 | return off; |
7426 | } | |
7427 | ||
2b188cc1 JA |
7428 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7429 | { | |
75b28aff | 7430 | size_t pages; |
2b188cc1 | 7431 | |
75b28aff HV |
7432 | pages = (size_t)1 << get_order( |
7433 | rings_size(sq_entries, cq_entries, NULL)); | |
7434 | pages += (size_t)1 << get_order( | |
7435 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7436 | |
75b28aff | 7437 | return pages; |
2b188cc1 JA |
7438 | } |
7439 | ||
edafccee JA |
7440 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7441 | { | |
7442 | int i, j; | |
7443 | ||
7444 | if (!ctx->user_bufs) | |
7445 | return -ENXIO; | |
7446 | ||
7447 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7448 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7449 | ||
7450 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7451 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7452 | |
2e0464d4 | 7453 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7454 | kvfree(imu->bvec); |
edafccee JA |
7455 | imu->nr_bvecs = 0; |
7456 | } | |
7457 | ||
7458 | kfree(ctx->user_bufs); | |
7459 | ctx->user_bufs = NULL; | |
7460 | ctx->nr_user_bufs = 0; | |
7461 | return 0; | |
7462 | } | |
7463 | ||
7464 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7465 | void __user *arg, unsigned index) | |
7466 | { | |
7467 | struct iovec __user *src; | |
7468 | ||
7469 | #ifdef CONFIG_COMPAT | |
7470 | if (ctx->compat) { | |
7471 | struct compat_iovec __user *ciovs; | |
7472 | struct compat_iovec ciov; | |
7473 | ||
7474 | ciovs = (struct compat_iovec __user *) arg; | |
7475 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7476 | return -EFAULT; | |
7477 | ||
d55e5f5b | 7478 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7479 | dst->iov_len = ciov.iov_len; |
7480 | return 0; | |
7481 | } | |
7482 | #endif | |
7483 | src = (struct iovec __user *) arg; | |
7484 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7485 | return -EFAULT; | |
7486 | return 0; | |
7487 | } | |
7488 | ||
7489 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7490 | unsigned nr_args) | |
7491 | { | |
7492 | struct vm_area_struct **vmas = NULL; | |
7493 | struct page **pages = NULL; | |
7494 | int i, j, got_pages = 0; | |
7495 | int ret = -EINVAL; | |
7496 | ||
7497 | if (ctx->user_bufs) | |
7498 | return -EBUSY; | |
7499 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7500 | return -EINVAL; | |
7501 | ||
7502 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7503 | GFP_KERNEL); | |
7504 | if (!ctx->user_bufs) | |
7505 | return -ENOMEM; | |
7506 | ||
7507 | for (i = 0; i < nr_args; i++) { | |
7508 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7509 | unsigned long off, start, end, ubuf; | |
7510 | int pret, nr_pages; | |
7511 | struct iovec iov; | |
7512 | size_t size; | |
7513 | ||
7514 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7515 | if (ret) | |
a278682d | 7516 | goto err; |
edafccee JA |
7517 | |
7518 | /* | |
7519 | * Don't impose further limits on the size and buffer | |
7520 | * constraints here, we'll -EINVAL later when IO is | |
7521 | * submitted if they are wrong. | |
7522 | */ | |
7523 | ret = -EFAULT; | |
7524 | if (!iov.iov_base || !iov.iov_len) | |
7525 | goto err; | |
7526 | ||
7527 | /* arbitrary limit, but we need something */ | |
7528 | if (iov.iov_len > SZ_1G) | |
7529 | goto err; | |
7530 | ||
7531 | ubuf = (unsigned long) iov.iov_base; | |
7532 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7533 | start = ubuf >> PAGE_SHIFT; | |
7534 | nr_pages = end - start; | |
7535 | ||
2e0464d4 | 7536 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7537 | if (ret) |
7538 | goto err; | |
edafccee JA |
7539 | |
7540 | ret = 0; | |
7541 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7542 | kvfree(vmas); |
7543 | kvfree(pages); | |
d4ef6475 | 7544 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7545 | GFP_KERNEL); |
d4ef6475 | 7546 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7547 | sizeof(struct vm_area_struct *), |
7548 | GFP_KERNEL); | |
7549 | if (!pages || !vmas) { | |
7550 | ret = -ENOMEM; | |
2e0464d4 | 7551 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7552 | goto err; |
7553 | } | |
7554 | got_pages = nr_pages; | |
7555 | } | |
7556 | ||
d4ef6475 | 7557 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7558 | GFP_KERNEL); |
7559 | ret = -ENOMEM; | |
7560 | if (!imu->bvec) { | |
2e0464d4 | 7561 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7562 | goto err; |
7563 | } | |
7564 | ||
7565 | ret = 0; | |
d8ed45c5 | 7566 | mmap_read_lock(current->mm); |
2113b05d | 7567 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7568 | FOLL_WRITE | FOLL_LONGTERM, |
7569 | pages, vmas); | |
edafccee JA |
7570 | if (pret == nr_pages) { |
7571 | /* don't support file backed memory */ | |
7572 | for (j = 0; j < nr_pages; j++) { | |
7573 | struct vm_area_struct *vma = vmas[j]; | |
7574 | ||
7575 | if (vma->vm_file && | |
7576 | !is_file_hugepages(vma->vm_file)) { | |
7577 | ret = -EOPNOTSUPP; | |
7578 | break; | |
7579 | } | |
7580 | } | |
7581 | } else { | |
7582 | ret = pret < 0 ? pret : -EFAULT; | |
7583 | } | |
d8ed45c5 | 7584 | mmap_read_unlock(current->mm); |
edafccee JA |
7585 | if (ret) { |
7586 | /* | |
7587 | * if we did partial map, or found file backed vmas, | |
7588 | * release any pages we did get | |
7589 | */ | |
27c4d3a3 | 7590 | if (pret > 0) |
f1f6a7dd | 7591 | unpin_user_pages(pages, pret); |
2e0464d4 | 7592 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7593 | kvfree(imu->bvec); |
edafccee JA |
7594 | goto err; |
7595 | } | |
7596 | ||
7597 | off = ubuf & ~PAGE_MASK; | |
7598 | size = iov.iov_len; | |
7599 | for (j = 0; j < nr_pages; j++) { | |
7600 | size_t vec_len; | |
7601 | ||
7602 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7603 | imu->bvec[j].bv_page = pages[j]; | |
7604 | imu->bvec[j].bv_len = vec_len; | |
7605 | imu->bvec[j].bv_offset = off; | |
7606 | off = 0; | |
7607 | size -= vec_len; | |
7608 | } | |
7609 | /* store original address for later verification */ | |
7610 | imu->ubuf = ubuf; | |
7611 | imu->len = iov.iov_len; | |
7612 | imu->nr_bvecs = nr_pages; | |
7613 | ||
7614 | ctx->nr_user_bufs++; | |
7615 | } | |
d4ef6475 MR |
7616 | kvfree(pages); |
7617 | kvfree(vmas); | |
edafccee JA |
7618 | return 0; |
7619 | err: | |
d4ef6475 MR |
7620 | kvfree(pages); |
7621 | kvfree(vmas); | |
edafccee JA |
7622 | io_sqe_buffer_unregister(ctx); |
7623 | return ret; | |
7624 | } | |
7625 | ||
9b402849 JA |
7626 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7627 | { | |
7628 | __s32 __user *fds = arg; | |
7629 | int fd; | |
7630 | ||
7631 | if (ctx->cq_ev_fd) | |
7632 | return -EBUSY; | |
7633 | ||
7634 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7635 | return -EFAULT; | |
7636 | ||
7637 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7638 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7639 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7640 | ctx->cq_ev_fd = NULL; | |
7641 | return ret; | |
7642 | } | |
7643 | ||
7644 | return 0; | |
7645 | } | |
7646 | ||
7647 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7648 | { | |
7649 | if (ctx->cq_ev_fd) { | |
7650 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7651 | ctx->cq_ev_fd = NULL; | |
7652 | return 0; | |
7653 | } | |
7654 | ||
7655 | return -ENXIO; | |
7656 | } | |
7657 | ||
5a2e745d JA |
7658 | static int __io_destroy_buffers(int id, void *p, void *data) |
7659 | { | |
7660 | struct io_ring_ctx *ctx = data; | |
7661 | struct io_buffer *buf = p; | |
7662 | ||
067524e9 | 7663 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7664 | return 0; |
7665 | } | |
7666 | ||
7667 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7668 | { | |
7669 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7670 | idr_destroy(&ctx->io_buffer_idr); | |
7671 | } | |
7672 | ||
2b188cc1 JA |
7673 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7674 | { | |
6b06314c | 7675 | io_finish_async(ctx); |
30975825 | 7676 | if (ctx->sqo_mm) { |
2b188cc1 | 7677 | mmdrop(ctx->sqo_mm); |
30975825 BM |
7678 | ctx->sqo_mm = NULL; |
7679 | } | |
def596e9 | 7680 | |
edafccee | 7681 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7682 | io_sqe_files_unregister(ctx); |
9b402849 | 7683 | io_eventfd_unregister(ctx); |
5a2e745d | 7684 | io_destroy_buffers(ctx); |
41726c9a | 7685 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7686 | |
2b188cc1 | 7687 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7688 | if (ctx->ring_sock) { |
7689 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7690 | sock_release(ctx->ring_sock); |
355e8d26 | 7691 | } |
2b188cc1 JA |
7692 | #endif |
7693 | ||
75b28aff | 7694 | io_mem_free(ctx->rings); |
2b188cc1 | 7695 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7696 | |
7697 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 7698 | free_uid(ctx->user); |
181e448d | 7699 | put_cred(ctx->creds); |
78076bb6 | 7700 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7701 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7702 | kfree(ctx); |
7703 | } | |
7704 | ||
7705 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7706 | { | |
7707 | struct io_ring_ctx *ctx = file->private_data; | |
7708 | __poll_t mask = 0; | |
7709 | ||
7710 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7711 | /* |
7712 | * synchronizes with barrier from wq_has_sleeper call in | |
7713 | * io_commit_cqring | |
7714 | */ | |
2b188cc1 | 7715 | smp_rmb(); |
75b28aff HV |
7716 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7717 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7718 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7719 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7720 | mask |= EPOLLIN | EPOLLRDNORM; |
7721 | ||
7722 | return mask; | |
7723 | } | |
7724 | ||
7725 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7726 | { | |
7727 | struct io_ring_ctx *ctx = file->private_data; | |
7728 | ||
7729 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7730 | } | |
7731 | ||
071698e1 JA |
7732 | static int io_remove_personalities(int id, void *p, void *data) |
7733 | { | |
7734 | struct io_ring_ctx *ctx = data; | |
7735 | const struct cred *cred; | |
7736 | ||
7737 | cred = idr_remove(&ctx->personality_idr, id); | |
7738 | if (cred) | |
7739 | put_cred(cred); | |
7740 | return 0; | |
7741 | } | |
7742 | ||
85faa7b8 JA |
7743 | static void io_ring_exit_work(struct work_struct *work) |
7744 | { | |
b2edc0a7 PB |
7745 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
7746 | exit_work); | |
85faa7b8 | 7747 | |
56952e91 JA |
7748 | /* |
7749 | * If we're doing polled IO and end up having requests being | |
7750 | * submitted async (out-of-line), then completions can come in while | |
7751 | * we're waiting for refs to drop. We need to reap these manually, | |
7752 | * as nobody else will be looking for them. | |
7753 | */ | |
b2edc0a7 | 7754 | do { |
56952e91 JA |
7755 | if (ctx->rings) |
7756 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 PB |
7757 | io_iopoll_try_reap_events(ctx); |
7758 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
7759 | io_ring_ctx_free(ctx); |
7760 | } | |
7761 | ||
2b188cc1 JA |
7762 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7763 | { | |
7764 | mutex_lock(&ctx->uring_lock); | |
7765 | percpu_ref_kill(&ctx->refs); | |
7766 | mutex_unlock(&ctx->uring_lock); | |
7767 | ||
5262f567 | 7768 | io_kill_timeouts(ctx); |
221c5eb2 | 7769 | io_poll_remove_all(ctx); |
561fb04a JA |
7770 | |
7771 | if (ctx->io_wq) | |
7772 | io_wq_cancel_all(ctx->io_wq); | |
7773 | ||
15dff286 JA |
7774 | /* if we failed setting up the ctx, we might not have any rings */ |
7775 | if (ctx->rings) | |
7776 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 | 7777 | io_iopoll_try_reap_events(ctx); |
071698e1 | 7778 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
7779 | |
7780 | /* | |
7781 | * Do this upfront, so we won't have a grace period where the ring | |
7782 | * is closed but resources aren't reaped yet. This can cause | |
7783 | * spurious failure in setting up a new ring. | |
7784 | */ | |
760618f7 JA |
7785 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
7786 | ACCT_LOCKED); | |
309fc03a | 7787 | |
85faa7b8 JA |
7788 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7789 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7790 | } |
7791 | ||
7792 | static int io_uring_release(struct inode *inode, struct file *file) | |
7793 | { | |
7794 | struct io_ring_ctx *ctx = file->private_data; | |
7795 | ||
7796 | file->private_data = NULL; | |
7797 | io_ring_ctx_wait_and_kill(ctx); | |
7798 | return 0; | |
7799 | } | |
7800 | ||
67c4d9e6 PB |
7801 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7802 | { | |
7803 | struct files_struct *files = data; | |
7804 | ||
7805 | return work->files == files; | |
7806 | } | |
7807 | ||
fcb323cc JA |
7808 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7809 | struct files_struct *files) | |
7810 | { | |
67c4d9e6 PB |
7811 | if (list_empty_careful(&ctx->inflight_list)) |
7812 | return; | |
7813 | ||
7814 | /* cancel all at once, should be faster than doing it one by one*/ | |
7815 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
7816 | ||
fcb323cc | 7817 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7818 | struct io_kiocb *cancel_req = NULL, *req; |
7819 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7820 | |
7821 | spin_lock_irq(&ctx->inflight_lock); | |
7822 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7823 | if (req->work.files != files) |
7824 | continue; | |
7825 | /* req is being completed, ignore */ | |
7826 | if (!refcount_inc_not_zero(&req->refs)) | |
7827 | continue; | |
7828 | cancel_req = req; | |
7829 | break; | |
fcb323cc | 7830 | } |
768134d4 | 7831 | if (cancel_req) |
fcb323cc | 7832 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7833 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7834 | spin_unlock_irq(&ctx->inflight_lock); |
7835 | ||
768134d4 JA |
7836 | /* We need to keep going until we don't find a matching req */ |
7837 | if (!cancel_req) | |
fcb323cc | 7838 | break; |
2f6d9b9d | 7839 | |
2ca10259 JA |
7840 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7841 | spin_lock_irq(&ctx->completion_lock); | |
40d8ddd4 | 7842 | list_del(&cancel_req->compl.list); |
2ca10259 JA |
7843 | cancel_req->flags &= ~REQ_F_OVERFLOW; |
7844 | if (list_empty(&ctx->cq_overflow_list)) { | |
7845 | clear_bit(0, &ctx->sq_check_overflow); | |
7846 | clear_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 7847 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; |
2ca10259 JA |
7848 | } |
7849 | spin_unlock_irq(&ctx->completion_lock); | |
7850 | ||
7851 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7852 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7853 | ||
7854 | /* | |
7855 | * Put inflight ref and overflow ref. If that's | |
7856 | * all we had, then we're done with this request. | |
7857 | */ | |
7858 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7859 | io_free_req(cancel_req); |
d8f1b971 | 7860 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7861 | continue; |
7862 | } | |
7b53d598 PB |
7863 | } else { |
7864 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7865 | io_put_req(cancel_req); | |
2ca10259 JA |
7866 | } |
7867 | ||
fcb323cc | 7868 | schedule(); |
d8f1b971 | 7869 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7870 | } |
7871 | } | |
7872 | ||
801dd57b | 7873 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 7874 | { |
801dd57b PB |
7875 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
7876 | struct task_struct *task = data; | |
44e728b8 | 7877 | |
801dd57b | 7878 | return req->task == task; |
44e728b8 PB |
7879 | } |
7880 | ||
fcb323cc JA |
7881 | static int io_uring_flush(struct file *file, void *data) |
7882 | { | |
7883 | struct io_ring_ctx *ctx = file->private_data; | |
7884 | ||
7885 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7886 | |
7887 | /* | |
7888 | * If the task is going away, cancel work it may have pending | |
7889 | */ | |
801dd57b PB |
7890 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
7891 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 7892 | |
fcb323cc JA |
7893 | return 0; |
7894 | } | |
7895 | ||
6c5c240e RP |
7896 | static void *io_uring_validate_mmap_request(struct file *file, |
7897 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7898 | { |
2b188cc1 | 7899 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7900 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7901 | struct page *page; |
7902 | void *ptr; | |
7903 | ||
7904 | switch (offset) { | |
7905 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7906 | case IORING_OFF_CQ_RING: |
7907 | ptr = ctx->rings; | |
2b188cc1 JA |
7908 | break; |
7909 | case IORING_OFF_SQES: | |
7910 | ptr = ctx->sq_sqes; | |
7911 | break; | |
2b188cc1 | 7912 | default: |
6c5c240e | 7913 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7914 | } |
7915 | ||
7916 | page = virt_to_head_page(ptr); | |
a50b854e | 7917 | if (sz > page_size(page)) |
6c5c240e RP |
7918 | return ERR_PTR(-EINVAL); |
7919 | ||
7920 | return ptr; | |
7921 | } | |
7922 | ||
7923 | #ifdef CONFIG_MMU | |
7924 | ||
7925 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7926 | { | |
7927 | size_t sz = vma->vm_end - vma->vm_start; | |
7928 | unsigned long pfn; | |
7929 | void *ptr; | |
7930 | ||
7931 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7932 | if (IS_ERR(ptr)) | |
7933 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7934 | |
7935 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7936 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7937 | } | |
7938 | ||
6c5c240e RP |
7939 | #else /* !CONFIG_MMU */ |
7940 | ||
7941 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7942 | { | |
7943 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7944 | } | |
7945 | ||
7946 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7947 | { | |
7948 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7949 | } | |
7950 | ||
7951 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7952 | unsigned long addr, unsigned long len, | |
7953 | unsigned long pgoff, unsigned long flags) | |
7954 | { | |
7955 | void *ptr; | |
7956 | ||
7957 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7958 | if (IS_ERR(ptr)) | |
7959 | return PTR_ERR(ptr); | |
7960 | ||
7961 | return (unsigned long) ptr; | |
7962 | } | |
7963 | ||
7964 | #endif /* !CONFIG_MMU */ | |
7965 | ||
2b188cc1 JA |
7966 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7967 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7968 | size_t, sigsz) | |
7969 | { | |
7970 | struct io_ring_ctx *ctx; | |
7971 | long ret = -EBADF; | |
7972 | int submitted = 0; | |
7973 | struct fd f; | |
7974 | ||
4c6e277c | 7975 | io_run_task_work(); |
b41e9852 | 7976 | |
6c271ce2 | 7977 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7978 | return -EINVAL; |
7979 | ||
7980 | f = fdget(fd); | |
7981 | if (!f.file) | |
7982 | return -EBADF; | |
7983 | ||
7984 | ret = -EOPNOTSUPP; | |
7985 | if (f.file->f_op != &io_uring_fops) | |
7986 | goto out_fput; | |
7987 | ||
7988 | ret = -ENXIO; | |
7989 | ctx = f.file->private_data; | |
7990 | if (!percpu_ref_tryget(&ctx->refs)) | |
7991 | goto out_fput; | |
7992 | ||
6c271ce2 JA |
7993 | /* |
7994 | * For SQ polling, the thread will do all submissions and completions. | |
7995 | * Just return the requested submit count, and wake the thread if | |
7996 | * we were asked to. | |
7997 | */ | |
b2a9eada | 7998 | ret = 0; |
6c271ce2 | 7999 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
8000 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
8001 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
8002 | if (flags & IORING_ENTER_SQ_WAKEUP) |
8003 | wake_up(&ctx->sqo_wait); | |
8004 | submitted = to_submit; | |
b2a9eada | 8005 | } else if (to_submit) { |
2b188cc1 | 8006 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 8007 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 8008 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8009 | |
8010 | if (submitted != to_submit) | |
8011 | goto out; | |
2b188cc1 JA |
8012 | } |
8013 | if (flags & IORING_ENTER_GETEVENTS) { | |
8014 | min_complete = min(min_complete, ctx->cq_entries); | |
8015 | ||
32b2244a XW |
8016 | /* |
8017 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8018 | * space applications don't need to do io completion events | |
8019 | * polling again, they can rely on io_sq_thread to do polling | |
8020 | * work, which can reduce cpu usage and uring_lock contention. | |
8021 | */ | |
8022 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8023 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8024 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8025 | } else { |
8026 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8027 | } | |
2b188cc1 JA |
8028 | } |
8029 | ||
7c504e65 | 8030 | out: |
6805b32e | 8031 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8032 | out_fput: |
8033 | fdput(f); | |
8034 | return submitted ? submitted : ret; | |
8035 | } | |
8036 | ||
bebdb65e | 8037 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8038 | static int io_uring_show_cred(int id, void *p, void *data) |
8039 | { | |
8040 | const struct cred *cred = p; | |
8041 | struct seq_file *m = data; | |
8042 | struct user_namespace *uns = seq_user_ns(m); | |
8043 | struct group_info *gi; | |
8044 | kernel_cap_t cap; | |
8045 | unsigned __capi; | |
8046 | int g; | |
8047 | ||
8048 | seq_printf(m, "%5d\n", id); | |
8049 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8050 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8051 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8052 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8053 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8054 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8055 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8056 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8057 | seq_puts(m, "\n\tGroups:\t"); | |
8058 | gi = cred->group_info; | |
8059 | for (g = 0; g < gi->ngroups; g++) { | |
8060 | seq_put_decimal_ull(m, g ? " " : "", | |
8061 | from_kgid_munged(uns, gi->gid[g])); | |
8062 | } | |
8063 | seq_puts(m, "\n\tCapEff:\t"); | |
8064 | cap = cred->cap_effective; | |
8065 | CAP_FOR_EACH_U32(__capi) | |
8066 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8067 | seq_putc(m, '\n'); | |
8068 | return 0; | |
8069 | } | |
8070 | ||
8071 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8072 | { | |
8073 | int i; | |
8074 | ||
8075 | mutex_lock(&ctx->uring_lock); | |
8076 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
8077 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8078 | struct fixed_file_table *table; | |
8079 | struct file *f; | |
8080 | ||
8081 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8082 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8083 | if (f) | |
8084 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8085 | else | |
8086 | seq_printf(m, "%5u: <none>\n", i); | |
8087 | } | |
8088 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
8089 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8090 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
8091 | ||
8092 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8093 | (unsigned int) buf->len); | |
8094 | } | |
8095 | if (!idr_is_empty(&ctx->personality_idr)) { | |
8096 | seq_printf(m, "Personalities:\n"); | |
8097 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8098 | } | |
d7718a9d JA |
8099 | seq_printf(m, "PollList:\n"); |
8100 | spin_lock_irq(&ctx->completion_lock); | |
8101 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8102 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8103 | struct io_kiocb *req; | |
8104 | ||
8105 | hlist_for_each_entry(req, list, hash_node) | |
8106 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8107 | req->task->task_works != NULL); | |
8108 | } | |
8109 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
8110 | mutex_unlock(&ctx->uring_lock); |
8111 | } | |
8112 | ||
8113 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8114 | { | |
8115 | struct io_ring_ctx *ctx = f->private_data; | |
8116 | ||
8117 | if (percpu_ref_tryget(&ctx->refs)) { | |
8118 | __io_uring_show_fdinfo(ctx, m); | |
8119 | percpu_ref_put(&ctx->refs); | |
8120 | } | |
8121 | } | |
bebdb65e | 8122 | #endif |
87ce955b | 8123 | |
2b188cc1 JA |
8124 | static const struct file_operations io_uring_fops = { |
8125 | .release = io_uring_release, | |
fcb323cc | 8126 | .flush = io_uring_flush, |
2b188cc1 | 8127 | .mmap = io_uring_mmap, |
6c5c240e RP |
8128 | #ifndef CONFIG_MMU |
8129 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8130 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8131 | #endif | |
2b188cc1 JA |
8132 | .poll = io_uring_poll, |
8133 | .fasync = io_uring_fasync, | |
bebdb65e | 8134 | #ifdef CONFIG_PROC_FS |
87ce955b | 8135 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8136 | #endif |
2b188cc1 JA |
8137 | }; |
8138 | ||
8139 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8140 | struct io_uring_params *p) | |
8141 | { | |
75b28aff HV |
8142 | struct io_rings *rings; |
8143 | size_t size, sq_array_offset; | |
2b188cc1 | 8144 | |
75b28aff HV |
8145 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8146 | if (size == SIZE_MAX) | |
8147 | return -EOVERFLOW; | |
8148 | ||
8149 | rings = io_mem_alloc(size); | |
8150 | if (!rings) | |
2b188cc1 JA |
8151 | return -ENOMEM; |
8152 | ||
75b28aff HV |
8153 | ctx->rings = rings; |
8154 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8155 | rings->sq_ring_mask = p->sq_entries - 1; | |
8156 | rings->cq_ring_mask = p->cq_entries - 1; | |
8157 | rings->sq_ring_entries = p->sq_entries; | |
8158 | rings->cq_ring_entries = p->cq_entries; | |
8159 | ctx->sq_mask = rings->sq_ring_mask; | |
8160 | ctx->cq_mask = rings->cq_ring_mask; | |
8161 | ctx->sq_entries = rings->sq_ring_entries; | |
8162 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
8163 | |
8164 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8165 | if (size == SIZE_MAX) { |
8166 | io_mem_free(ctx->rings); | |
8167 | ctx->rings = NULL; | |
2b188cc1 | 8168 | return -EOVERFLOW; |
eb065d30 | 8169 | } |
2b188cc1 JA |
8170 | |
8171 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8172 | if (!ctx->sq_sqes) { |
8173 | io_mem_free(ctx->rings); | |
8174 | ctx->rings = NULL; | |
2b188cc1 | 8175 | return -ENOMEM; |
eb065d30 | 8176 | } |
2b188cc1 | 8177 | |
2b188cc1 JA |
8178 | return 0; |
8179 | } | |
8180 | ||
8181 | /* | |
8182 | * Allocate an anonymous fd, this is what constitutes the application | |
8183 | * visible backing of an io_uring instance. The application mmaps this | |
8184 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8185 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8186 | */ | |
8187 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8188 | { | |
8189 | struct file *file; | |
8190 | int ret; | |
8191 | ||
8192 | #if defined(CONFIG_UNIX) | |
8193 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8194 | &ctx->ring_sock); | |
8195 | if (ret) | |
8196 | return ret; | |
8197 | #endif | |
8198 | ||
8199 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8200 | if (ret < 0) | |
8201 | goto err; | |
8202 | ||
8203 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8204 | O_RDWR | O_CLOEXEC); | |
8205 | if (IS_ERR(file)) { | |
8206 | put_unused_fd(ret); | |
8207 | ret = PTR_ERR(file); | |
8208 | goto err; | |
8209 | } | |
8210 | ||
8211 | #if defined(CONFIG_UNIX) | |
8212 | ctx->ring_sock->file = file; | |
8213 | #endif | |
8214 | fd_install(ret, file); | |
8215 | return ret; | |
8216 | err: | |
8217 | #if defined(CONFIG_UNIX) | |
8218 | sock_release(ctx->ring_sock); | |
8219 | ctx->ring_sock = NULL; | |
8220 | #endif | |
8221 | return ret; | |
8222 | } | |
8223 | ||
7f13657d XW |
8224 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8225 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8226 | { |
8227 | struct user_struct *user = NULL; | |
8228 | struct io_ring_ctx *ctx; | |
aad5d8da | 8229 | bool limit_mem; |
2b188cc1 JA |
8230 | int ret; |
8231 | ||
8110c1a6 | 8232 | if (!entries) |
2b188cc1 | 8233 | return -EINVAL; |
8110c1a6 JA |
8234 | if (entries > IORING_MAX_ENTRIES) { |
8235 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8236 | return -EINVAL; | |
8237 | entries = IORING_MAX_ENTRIES; | |
8238 | } | |
2b188cc1 JA |
8239 | |
8240 | /* | |
8241 | * Use twice as many entries for the CQ ring. It's possible for the | |
8242 | * application to drive a higher depth than the size of the SQ ring, | |
8243 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8244 | * some flexibility in overcommitting a bit. If the application has |
8245 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8246 | * of CQ ring entries manually. | |
2b188cc1 JA |
8247 | */ |
8248 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8249 | if (p->flags & IORING_SETUP_CQSIZE) { |
8250 | /* | |
8251 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8252 | * to a power-of-two, if it isn't already. We do NOT impose | |
8253 | * any cq vs sq ring sizing. | |
8254 | */ | |
8110c1a6 | 8255 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8256 | return -EINVAL; |
8110c1a6 JA |
8257 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8258 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8259 | return -EINVAL; | |
8260 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8261 | } | |
33a107f0 JA |
8262 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8263 | } else { | |
8264 | p->cq_entries = 2 * p->sq_entries; | |
8265 | } | |
2b188cc1 JA |
8266 | |
8267 | user = get_uid(current_user()); | |
aad5d8da | 8268 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8269 | |
aad5d8da | 8270 | if (limit_mem) { |
a087e2b5 | 8271 | ret = __io_account_mem(user, |
2b188cc1 JA |
8272 | ring_pages(p->sq_entries, p->cq_entries)); |
8273 | if (ret) { | |
8274 | free_uid(user); | |
8275 | return ret; | |
8276 | } | |
8277 | } | |
8278 | ||
8279 | ctx = io_ring_ctx_alloc(p); | |
8280 | if (!ctx) { | |
aad5d8da | 8281 | if (limit_mem) |
a087e2b5 | 8282 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8283 | p->cq_entries)); |
8284 | free_uid(user); | |
8285 | return -ENOMEM; | |
8286 | } | |
8287 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8288 | ctx->user = user; |
0b8c0ec7 | 8289 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
8290 | |
8291 | ret = io_allocate_scq_urings(ctx, p); | |
8292 | if (ret) | |
8293 | goto err; | |
8294 | ||
6c271ce2 | 8295 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8296 | if (ret) |
8297 | goto err; | |
8298 | ||
2b188cc1 | 8299 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8300 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8301 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8302 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8303 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8304 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8305 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8306 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8307 | |
8308 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8309 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8310 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8311 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8312 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8313 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8314 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8315 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8316 | |
7f13657d XW |
8317 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8318 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8319 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8320 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8321 | |
8322 | if (copy_to_user(params, p, sizeof(*p))) { | |
8323 | ret = -EFAULT; | |
8324 | goto err; | |
8325 | } | |
044c1ab3 JA |
8326 | /* |
8327 | * Install ring fd as the very last thing, so we don't risk someone | |
8328 | * having closed it before we finish setup | |
8329 | */ | |
8330 | ret = io_uring_get_fd(ctx); | |
8331 | if (ret < 0) | |
8332 | goto err; | |
8333 | ||
c826bd7a | 8334 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2e0464d4 BM |
8335 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), |
8336 | ACCT_LOCKED); | |
30975825 | 8337 | ctx->limit_mem = limit_mem; |
2b188cc1 JA |
8338 | return ret; |
8339 | err: | |
8340 | io_ring_ctx_wait_and_kill(ctx); | |
8341 | return ret; | |
8342 | } | |
8343 | ||
8344 | /* | |
8345 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8346 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8347 | * params structure passed in. | |
8348 | */ | |
8349 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8350 | { | |
8351 | struct io_uring_params p; | |
2b188cc1 JA |
8352 | int i; |
8353 | ||
8354 | if (copy_from_user(&p, params, sizeof(p))) | |
8355 | return -EFAULT; | |
8356 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8357 | if (p.resv[i]) | |
8358 | return -EINVAL; | |
8359 | } | |
8360 | ||
6c271ce2 | 8361 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 8362 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 8363 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
8364 | return -EINVAL; |
8365 | ||
7f13657d | 8366 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
8367 | } |
8368 | ||
8369 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
8370 | struct io_uring_params __user *, params) | |
8371 | { | |
8372 | return io_uring_setup(entries, params); | |
8373 | } | |
8374 | ||
66f4af93 JA |
8375 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
8376 | { | |
8377 | struct io_uring_probe *p; | |
8378 | size_t size; | |
8379 | int i, ret; | |
8380 | ||
8381 | size = struct_size(p, ops, nr_args); | |
8382 | if (size == SIZE_MAX) | |
8383 | return -EOVERFLOW; | |
8384 | p = kzalloc(size, GFP_KERNEL); | |
8385 | if (!p) | |
8386 | return -ENOMEM; | |
8387 | ||
8388 | ret = -EFAULT; | |
8389 | if (copy_from_user(p, arg, size)) | |
8390 | goto out; | |
8391 | ret = -EINVAL; | |
8392 | if (memchr_inv(p, 0, size)) | |
8393 | goto out; | |
8394 | ||
8395 | p->last_op = IORING_OP_LAST - 1; | |
8396 | if (nr_args > IORING_OP_LAST) | |
8397 | nr_args = IORING_OP_LAST; | |
8398 | ||
8399 | for (i = 0; i < nr_args; i++) { | |
8400 | p->ops[i].op = i; | |
8401 | if (!io_op_defs[i].not_supported) | |
8402 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8403 | } | |
8404 | p->ops_len = i; | |
8405 | ||
8406 | ret = 0; | |
8407 | if (copy_to_user(arg, p, size)) | |
8408 | ret = -EFAULT; | |
8409 | out: | |
8410 | kfree(p); | |
8411 | return ret; | |
8412 | } | |
8413 | ||
071698e1 JA |
8414 | static int io_register_personality(struct io_ring_ctx *ctx) |
8415 | { | |
8416 | const struct cred *creds = get_current_cred(); | |
8417 | int id; | |
8418 | ||
8419 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8420 | USHRT_MAX, GFP_KERNEL); | |
8421 | if (id < 0) | |
8422 | put_cred(creds); | |
8423 | return id; | |
8424 | } | |
8425 | ||
8426 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8427 | { | |
8428 | const struct cred *old_creds; | |
8429 | ||
8430 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8431 | if (old_creds) { | |
8432 | put_cred(old_creds); | |
8433 | return 0; | |
8434 | } | |
8435 | ||
8436 | return -EINVAL; | |
8437 | } | |
8438 | ||
8439 | static bool io_register_op_must_quiesce(int op) | |
8440 | { | |
8441 | switch (op) { | |
8442 | case IORING_UNREGISTER_FILES: | |
8443 | case IORING_REGISTER_FILES_UPDATE: | |
8444 | case IORING_REGISTER_PROBE: | |
8445 | case IORING_REGISTER_PERSONALITY: | |
8446 | case IORING_UNREGISTER_PERSONALITY: | |
8447 | return false; | |
8448 | default: | |
8449 | return true; | |
8450 | } | |
8451 | } | |
8452 | ||
edafccee JA |
8453 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8454 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8455 | __releases(ctx->uring_lock) |
8456 | __acquires(ctx->uring_lock) | |
edafccee JA |
8457 | { |
8458 | int ret; | |
8459 | ||
35fa71a0 JA |
8460 | /* |
8461 | * We're inside the ring mutex, if the ref is already dying, then | |
8462 | * someone else killed the ctx or is already going through | |
8463 | * io_uring_register(). | |
8464 | */ | |
8465 | if (percpu_ref_is_dying(&ctx->refs)) | |
8466 | return -ENXIO; | |
8467 | ||
071698e1 | 8468 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8469 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8470 | |
05f3fb3c JA |
8471 | /* |
8472 | * Drop uring mutex before waiting for references to exit. If | |
8473 | * another thread is currently inside io_uring_enter() it might | |
8474 | * need to grab the uring_lock to make progress. If we hold it | |
8475 | * here across the drain wait, then we can deadlock. It's safe | |
8476 | * to drop the mutex here, since no new references will come in | |
8477 | * after we've killed the percpu ref. | |
8478 | */ | |
8479 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8480 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8481 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8482 | if (ret) { |
8483 | percpu_ref_resurrect(&ctx->refs); | |
8484 | ret = -EINTR; | |
8485 | goto out; | |
8486 | } | |
05f3fb3c | 8487 | } |
edafccee JA |
8488 | |
8489 | switch (opcode) { | |
8490 | case IORING_REGISTER_BUFFERS: | |
8491 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8492 | break; | |
8493 | case IORING_UNREGISTER_BUFFERS: | |
8494 | ret = -EINVAL; | |
8495 | if (arg || nr_args) | |
8496 | break; | |
8497 | ret = io_sqe_buffer_unregister(ctx); | |
8498 | break; | |
6b06314c JA |
8499 | case IORING_REGISTER_FILES: |
8500 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8501 | break; | |
8502 | case IORING_UNREGISTER_FILES: | |
8503 | ret = -EINVAL; | |
8504 | if (arg || nr_args) | |
8505 | break; | |
8506 | ret = io_sqe_files_unregister(ctx); | |
8507 | break; | |
c3a31e60 JA |
8508 | case IORING_REGISTER_FILES_UPDATE: |
8509 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8510 | break; | |
9b402849 | 8511 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8512 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8513 | ret = -EINVAL; |
8514 | if (nr_args != 1) | |
8515 | break; | |
8516 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8517 | if (ret) |
8518 | break; | |
8519 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8520 | ctx->eventfd_async = 1; | |
8521 | else | |
8522 | ctx->eventfd_async = 0; | |
9b402849 JA |
8523 | break; |
8524 | case IORING_UNREGISTER_EVENTFD: | |
8525 | ret = -EINVAL; | |
8526 | if (arg || nr_args) | |
8527 | break; | |
8528 | ret = io_eventfd_unregister(ctx); | |
8529 | break; | |
66f4af93 JA |
8530 | case IORING_REGISTER_PROBE: |
8531 | ret = -EINVAL; | |
8532 | if (!arg || nr_args > 256) | |
8533 | break; | |
8534 | ret = io_probe(ctx, arg, nr_args); | |
8535 | break; | |
071698e1 JA |
8536 | case IORING_REGISTER_PERSONALITY: |
8537 | ret = -EINVAL; | |
8538 | if (arg || nr_args) | |
8539 | break; | |
8540 | ret = io_register_personality(ctx); | |
8541 | break; | |
8542 | case IORING_UNREGISTER_PERSONALITY: | |
8543 | ret = -EINVAL; | |
8544 | if (arg) | |
8545 | break; | |
8546 | ret = io_unregister_personality(ctx, nr_args); | |
8547 | break; | |
edafccee JA |
8548 | default: |
8549 | ret = -EINVAL; | |
8550 | break; | |
8551 | } | |
8552 | ||
071698e1 | 8553 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8554 | /* bring the ctx back to life */ |
05f3fb3c | 8555 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8556 | out: |
0f158b4c | 8557 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8558 | } |
edafccee JA |
8559 | return ret; |
8560 | } | |
8561 | ||
8562 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8563 | void __user *, arg, unsigned int, nr_args) | |
8564 | { | |
8565 | struct io_ring_ctx *ctx; | |
8566 | long ret = -EBADF; | |
8567 | struct fd f; | |
8568 | ||
8569 | f = fdget(fd); | |
8570 | if (!f.file) | |
8571 | return -EBADF; | |
8572 | ||
8573 | ret = -EOPNOTSUPP; | |
8574 | if (f.file->f_op != &io_uring_fops) | |
8575 | goto out_fput; | |
8576 | ||
8577 | ctx = f.file->private_data; | |
8578 | ||
8579 | mutex_lock(&ctx->uring_lock); | |
8580 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8581 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8582 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8583 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8584 | out_fput: |
8585 | fdput(f); | |
8586 | return ret; | |
8587 | } | |
8588 | ||
2b188cc1 JA |
8589 | static int __init io_uring_init(void) |
8590 | { | |
d7f62e82 SM |
8591 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8592 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8593 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8594 | } while (0) | |
8595 | ||
8596 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8597 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8598 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8599 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8600 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8601 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8602 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8603 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8604 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8605 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8606 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8607 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8608 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8609 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8610 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8611 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
8612 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
8613 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
8614 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
8615 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8616 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8617 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8618 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8619 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8620 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8621 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8622 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8623 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8624 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8625 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8626 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8627 | |
d3656344 | 8628 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8629 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8630 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8631 | return 0; | |
8632 | }; | |
8633 | __initcall(io_uring_init); |