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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 JA |
322 | /* |
323 | * ->poll_list is protected by the ctx->uring_lock for | |
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 | */ | |
328 | struct list_head poll_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; | |
b29472ee JA |
399 | }; |
400 | ||
9adbd45d JA |
401 | struct io_rw { |
402 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
403 | struct kiocb kiocb; | |
404 | u64 addr; | |
405 | u64 len; | |
406 | }; | |
407 | ||
3fbb51c1 JA |
408 | struct io_connect { |
409 | struct file *file; | |
410 | struct sockaddr __user *addr; | |
411 | int addr_len; | |
412 | }; | |
413 | ||
e47293fd JA |
414 | struct io_sr_msg { |
415 | struct file *file; | |
fddaface JA |
416 | union { |
417 | struct user_msghdr __user *msg; | |
418 | void __user *buf; | |
419 | }; | |
e47293fd | 420 | int msg_flags; |
bcda7baa | 421 | int bgid; |
fddaface | 422 | size_t len; |
bcda7baa | 423 | struct io_buffer *kbuf; |
e47293fd JA |
424 | }; |
425 | ||
15b71abe JA |
426 | struct io_open { |
427 | struct file *file; | |
428 | int dfd; | |
15b71abe | 429 | struct filename *filename; |
c12cedf2 | 430 | struct open_how how; |
4022e7af | 431 | unsigned long nofile; |
15b71abe JA |
432 | }; |
433 | ||
05f3fb3c JA |
434 | struct io_files_update { |
435 | struct file *file; | |
436 | u64 arg; | |
437 | u32 nr_args; | |
438 | u32 offset; | |
439 | }; | |
440 | ||
4840e418 JA |
441 | struct io_fadvise { |
442 | struct file *file; | |
443 | u64 offset; | |
444 | u32 len; | |
445 | u32 advice; | |
446 | }; | |
447 | ||
c1ca757b JA |
448 | struct io_madvise { |
449 | struct file *file; | |
450 | u64 addr; | |
451 | u32 len; | |
452 | u32 advice; | |
453 | }; | |
454 | ||
3e4827b0 JA |
455 | struct io_epoll { |
456 | struct file *file; | |
457 | int epfd; | |
458 | int op; | |
459 | int fd; | |
460 | struct epoll_event event; | |
e47293fd JA |
461 | }; |
462 | ||
7d67af2c PB |
463 | struct io_splice { |
464 | struct file *file_out; | |
465 | struct file *file_in; | |
466 | loff_t off_out; | |
467 | loff_t off_in; | |
468 | u64 len; | |
469 | unsigned int flags; | |
470 | }; | |
471 | ||
ddf0322d JA |
472 | struct io_provide_buf { |
473 | struct file *file; | |
474 | __u64 addr; | |
475 | __s32 len; | |
476 | __u32 bgid; | |
477 | __u16 nbufs; | |
478 | __u16 bid; | |
479 | }; | |
480 | ||
1d9e1288 BM |
481 | struct io_statx { |
482 | struct file *file; | |
483 | int dfd; | |
484 | unsigned int mask; | |
485 | unsigned int flags; | |
e62753e4 | 486 | const char __user *filename; |
1d9e1288 BM |
487 | struct statx __user *buffer; |
488 | }; | |
489 | ||
f499a021 JA |
490 | struct io_async_connect { |
491 | struct sockaddr_storage address; | |
492 | }; | |
493 | ||
03b1230c JA |
494 | struct io_async_msghdr { |
495 | struct iovec fast_iov[UIO_FASTIOV]; | |
496 | struct iovec *iov; | |
497 | struct sockaddr __user *uaddr; | |
498 | struct msghdr msg; | |
b537916c | 499 | struct sockaddr_storage addr; |
03b1230c JA |
500 | }; |
501 | ||
f67676d1 JA |
502 | struct io_async_rw { |
503 | struct iovec fast_iov[UIO_FASTIOV]; | |
504 | struct iovec *iov; | |
505 | ssize_t nr_segs; | |
506 | ssize_t size; | |
bcf5a063 JA |
507 | struct wait_page_queue wpq; |
508 | struct callback_head task_work; | |
f67676d1 JA |
509 | }; |
510 | ||
1a6b74fc | 511 | struct io_async_ctx { |
f67676d1 JA |
512 | union { |
513 | struct io_async_rw rw; | |
03b1230c | 514 | struct io_async_msghdr msg; |
f499a021 | 515 | struct io_async_connect connect; |
2d28390a | 516 | struct io_timeout_data timeout; |
f67676d1 | 517 | }; |
1a6b74fc JA |
518 | }; |
519 | ||
6b47ee6e PB |
520 | enum { |
521 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
522 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
523 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
524 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
525 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 526 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 527 | |
dea3b49c | 528 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
529 | REQ_F_LINK_NEXT_BIT, |
530 | REQ_F_FAIL_LINK_BIT, | |
531 | REQ_F_INFLIGHT_BIT, | |
532 | REQ_F_CUR_POS_BIT, | |
533 | REQ_F_NOWAIT_BIT, | |
6b47ee6e PB |
534 | REQ_F_LINK_TIMEOUT_BIT, |
535 | REQ_F_TIMEOUT_BIT, | |
536 | REQ_F_ISREG_BIT, | |
6b47ee6e PB |
537 | REQ_F_TIMEOUT_NOSEQ_BIT, |
538 | REQ_F_COMP_LOCKED_BIT, | |
99bc4c38 | 539 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 540 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 541 | REQ_F_POLLED_BIT, |
bcda7baa | 542 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 543 | REQ_F_NO_FILE_TABLE_BIT, |
d4c81f38 | 544 | REQ_F_QUEUE_TIMEOUT_BIT, |
7cdaf587 | 545 | REQ_F_WORK_INITIALIZED_BIT, |
4dd2824d | 546 | REQ_F_TASK_PINNED_BIT, |
84557871 JA |
547 | |
548 | /* not a real bit, just to check we're not overflowing the space */ | |
549 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
550 | }; |
551 | ||
552 | enum { | |
553 | /* ctx owns file */ | |
554 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
555 | /* drain existing IO first */ | |
556 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
557 | /* linked sqes */ | |
558 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
559 | /* doesn't sever on completion < 0 */ | |
560 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
561 | /* IOSQE_ASYNC */ | |
562 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
563 | /* IOSQE_BUFFER_SELECT */ |
564 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 565 | |
dea3b49c PB |
566 | /* head of a link */ |
567 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
568 | /* already grabbed next link */ |
569 | REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), | |
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), | |
580 | /* timeout request */ | |
581 | REQ_F_TIMEOUT = BIT(REQ_F_TIMEOUT_BIT), | |
582 | /* regular file */ | |
583 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
6b47ee6e PB |
584 | /* no timeout sequence */ |
585 | REQ_F_TIMEOUT_NOSEQ = BIT(REQ_F_TIMEOUT_NOSEQ_BIT), | |
586 | /* completion under lock */ | |
587 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
588 | /* needs cleanup */ |
589 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
590 | /* in overflow list */ |
591 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
592 | /* already went through poll handler */ |
593 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
594 | /* buffer already selected */ |
595 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
596 | /* doesn't need file table for this request */ |
597 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
d4c81f38 PB |
598 | /* needs to queue linked timeout */ |
599 | REQ_F_QUEUE_TIMEOUT = BIT(REQ_F_QUEUE_TIMEOUT_BIT), | |
7cdaf587 XW |
600 | /* io_wq_work is initialized */ |
601 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
4dd2824d PB |
602 | /* req->task is refcounted */ |
603 | REQ_F_TASK_PINNED = BIT(REQ_F_TASK_PINNED_BIT), | |
d7718a9d JA |
604 | }; |
605 | ||
606 | struct async_poll { | |
607 | struct io_poll_iocb poll; | |
608 | struct io_wq_work work; | |
6b47ee6e PB |
609 | }; |
610 | ||
09bb8394 JA |
611 | /* |
612 | * NOTE! Each of the iocb union members has the file pointer | |
613 | * as the first entry in their struct definition. So you can | |
614 | * access the file pointer through any of the sub-structs, | |
615 | * or directly as just 'ki_filp' in this struct. | |
616 | */ | |
2b188cc1 | 617 | struct io_kiocb { |
221c5eb2 | 618 | union { |
09bb8394 | 619 | struct file *file; |
9adbd45d | 620 | struct io_rw rw; |
221c5eb2 | 621 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
622 | struct io_accept accept; |
623 | struct io_sync sync; | |
fbf23849 | 624 | struct io_cancel cancel; |
b29472ee | 625 | struct io_timeout timeout; |
3fbb51c1 | 626 | struct io_connect connect; |
e47293fd | 627 | struct io_sr_msg sr_msg; |
15b71abe | 628 | struct io_open open; |
b5dba59e | 629 | struct io_close close; |
05f3fb3c | 630 | struct io_files_update files_update; |
4840e418 | 631 | struct io_fadvise fadvise; |
c1ca757b | 632 | struct io_madvise madvise; |
3e4827b0 | 633 | struct io_epoll epoll; |
7d67af2c | 634 | struct io_splice splice; |
ddf0322d | 635 | struct io_provide_buf pbuf; |
1d9e1288 | 636 | struct io_statx statx; |
221c5eb2 | 637 | }; |
2b188cc1 | 638 | |
1a6b74fc | 639 | struct io_async_ctx *io; |
c398ecb3 | 640 | int cflags; |
d625c6ee | 641 | u8 opcode; |
65a6543d XW |
642 | /* polled IO has completed */ |
643 | u8 iopoll_completed; | |
2b188cc1 | 644 | |
4f4eeba8 BM |
645 | u16 buf_index; |
646 | ||
2b188cc1 | 647 | struct io_ring_ctx *ctx; |
d7718a9d | 648 | struct list_head list; |
2b188cc1 | 649 | unsigned int flags; |
c16361c1 | 650 | refcount_t refs; |
3537b6a7 JA |
651 | struct task_struct *task; |
652 | unsigned long fsize; | |
2b188cc1 | 653 | u64 user_data; |
9e645e11 | 654 | u32 result; |
de0617e4 | 655 | u32 sequence; |
2b188cc1 | 656 | |
d7718a9d JA |
657 | struct list_head link_list; |
658 | ||
fcb323cc JA |
659 | struct list_head inflight_entry; |
660 | ||
05589553 XW |
661 | struct percpu_ref *fixed_file_refs; |
662 | ||
b41e9852 JA |
663 | union { |
664 | /* | |
665 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
666 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
667 | * async armed poll handlers for regular commands. The latter | |
668 | * restore the work, if needed. | |
b41e9852 JA |
669 | */ |
670 | struct { | |
b41e9852 | 671 | struct callback_head task_work; |
d7718a9d JA |
672 | struct hlist_node hash_node; |
673 | struct async_poll *apoll; | |
b41e9852 JA |
674 | }; |
675 | struct io_wq_work work; | |
676 | }; | |
2b188cc1 JA |
677 | }; |
678 | ||
def596e9 | 679 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 680 | |
013538bd JA |
681 | struct io_comp_state { |
682 | unsigned int nr; | |
683 | struct list_head list; | |
684 | struct io_ring_ctx *ctx; | |
685 | }; | |
686 | ||
9a56a232 JA |
687 | struct io_submit_state { |
688 | struct blk_plug plug; | |
689 | ||
2579f913 JA |
690 | /* |
691 | * io_kiocb alloc cache | |
692 | */ | |
693 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 694 | unsigned int free_reqs; |
2579f913 | 695 | |
013538bd JA |
696 | /* |
697 | * Batch completion logic | |
698 | */ | |
699 | struct io_comp_state comp; | |
700 | ||
9a56a232 JA |
701 | /* |
702 | * File reference cache | |
703 | */ | |
704 | struct file *file; | |
705 | unsigned int fd; | |
706 | unsigned int has_refs; | |
707 | unsigned int used_refs; | |
708 | unsigned int ios_left; | |
709 | }; | |
710 | ||
d3656344 JA |
711 | struct io_op_def { |
712 | /* needs req->io allocated for deferral/async */ | |
713 | unsigned async_ctx : 1; | |
714 | /* needs current->mm setup, does mm access */ | |
715 | unsigned needs_mm : 1; | |
716 | /* needs req->file assigned */ | |
717 | unsigned needs_file : 1; | |
fd2206e4 JA |
718 | /* don't fail if file grab fails */ |
719 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
720 | /* hash wq insertion if file is a regular file */ |
721 | unsigned hash_reg_file : 1; | |
722 | /* unbound wq insertion if file is a non-regular file */ | |
723 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
724 | /* opcode is not supported by this kernel */ |
725 | unsigned not_supported : 1; | |
f86cd20c JA |
726 | /* needs file table */ |
727 | unsigned file_table : 1; | |
ff002b30 JA |
728 | /* needs ->fs */ |
729 | unsigned needs_fs : 1; | |
8a72758c JA |
730 | /* set if opcode supports polled "wait" */ |
731 | unsigned pollin : 1; | |
732 | unsigned pollout : 1; | |
bcda7baa JA |
733 | /* op supports buffer selection */ |
734 | unsigned buffer_select : 1; | |
d3656344 JA |
735 | }; |
736 | ||
737 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
738 | [IORING_OP_NOP] = {}, |
739 | [IORING_OP_READV] = { | |
d3656344 JA |
740 | .async_ctx = 1, |
741 | .needs_mm = 1, | |
742 | .needs_file = 1, | |
743 | .unbound_nonreg_file = 1, | |
8a72758c | 744 | .pollin = 1, |
4d954c25 | 745 | .buffer_select = 1, |
d3656344 | 746 | }, |
0463b6c5 | 747 | [IORING_OP_WRITEV] = { |
d3656344 JA |
748 | .async_ctx = 1, |
749 | .needs_mm = 1, | |
750 | .needs_file = 1, | |
751 | .hash_reg_file = 1, | |
752 | .unbound_nonreg_file = 1, | |
8a72758c | 753 | .pollout = 1, |
d3656344 | 754 | }, |
0463b6c5 | 755 | [IORING_OP_FSYNC] = { |
d3656344 JA |
756 | .needs_file = 1, |
757 | }, | |
0463b6c5 | 758 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
759 | .needs_file = 1, |
760 | .unbound_nonreg_file = 1, | |
8a72758c | 761 | .pollin = 1, |
d3656344 | 762 | }, |
0463b6c5 | 763 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
764 | .needs_file = 1, |
765 | .hash_reg_file = 1, | |
766 | .unbound_nonreg_file = 1, | |
8a72758c | 767 | .pollout = 1, |
d3656344 | 768 | }, |
0463b6c5 | 769 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
770 | .needs_file = 1, |
771 | .unbound_nonreg_file = 1, | |
772 | }, | |
0463b6c5 PB |
773 | [IORING_OP_POLL_REMOVE] = {}, |
774 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
775 | .needs_file = 1, |
776 | }, | |
0463b6c5 | 777 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
778 | .async_ctx = 1, |
779 | .needs_mm = 1, | |
780 | .needs_file = 1, | |
781 | .unbound_nonreg_file = 1, | |
ff002b30 | 782 | .needs_fs = 1, |
8a72758c | 783 | .pollout = 1, |
d3656344 | 784 | }, |
0463b6c5 | 785 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
786 | .async_ctx = 1, |
787 | .needs_mm = 1, | |
788 | .needs_file = 1, | |
789 | .unbound_nonreg_file = 1, | |
ff002b30 | 790 | .needs_fs = 1, |
8a72758c | 791 | .pollin = 1, |
52de1fe1 | 792 | .buffer_select = 1, |
d3656344 | 793 | }, |
0463b6c5 | 794 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
795 | .async_ctx = 1, |
796 | .needs_mm = 1, | |
797 | }, | |
0463b6c5 PB |
798 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
799 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
800 | .needs_mm = 1, |
801 | .needs_file = 1, | |
802 | .unbound_nonreg_file = 1, | |
f86cd20c | 803 | .file_table = 1, |
8a72758c | 804 | .pollin = 1, |
d3656344 | 805 | }, |
0463b6c5 PB |
806 | [IORING_OP_ASYNC_CANCEL] = {}, |
807 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
808 | .async_ctx = 1, |
809 | .needs_mm = 1, | |
810 | }, | |
0463b6c5 | 811 | [IORING_OP_CONNECT] = { |
d3656344 JA |
812 | .async_ctx = 1, |
813 | .needs_mm = 1, | |
814 | .needs_file = 1, | |
815 | .unbound_nonreg_file = 1, | |
8a72758c | 816 | .pollout = 1, |
d3656344 | 817 | }, |
0463b6c5 | 818 | [IORING_OP_FALLOCATE] = { |
d3656344 JA |
819 | .needs_file = 1, |
820 | }, | |
0463b6c5 | 821 | [IORING_OP_OPENAT] = { |
f86cd20c | 822 | .file_table = 1, |
ff002b30 | 823 | .needs_fs = 1, |
d3656344 | 824 | }, |
0463b6c5 | 825 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
826 | .needs_file = 1, |
827 | .needs_file_no_error = 1, | |
f86cd20c | 828 | .file_table = 1, |
d3656344 | 829 | }, |
0463b6c5 | 830 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 831 | .needs_mm = 1, |
f86cd20c | 832 | .file_table = 1, |
d3656344 | 833 | }, |
0463b6c5 | 834 | [IORING_OP_STATX] = { |
d3656344 | 835 | .needs_mm = 1, |
ff002b30 | 836 | .needs_fs = 1, |
5b0bbee4 | 837 | .file_table = 1, |
d3656344 | 838 | }, |
0463b6c5 | 839 | [IORING_OP_READ] = { |
3a6820f2 JA |
840 | .needs_mm = 1, |
841 | .needs_file = 1, | |
842 | .unbound_nonreg_file = 1, | |
8a72758c | 843 | .pollin = 1, |
bcda7baa | 844 | .buffer_select = 1, |
3a6820f2 | 845 | }, |
0463b6c5 | 846 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
847 | .needs_mm = 1, |
848 | .needs_file = 1, | |
849 | .unbound_nonreg_file = 1, | |
8a72758c | 850 | .pollout = 1, |
3a6820f2 | 851 | }, |
0463b6c5 | 852 | [IORING_OP_FADVISE] = { |
4840e418 JA |
853 | .needs_file = 1, |
854 | }, | |
0463b6c5 | 855 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
856 | .needs_mm = 1, |
857 | }, | |
0463b6c5 | 858 | [IORING_OP_SEND] = { |
fddaface JA |
859 | .needs_mm = 1, |
860 | .needs_file = 1, | |
861 | .unbound_nonreg_file = 1, | |
8a72758c | 862 | .pollout = 1, |
fddaface | 863 | }, |
0463b6c5 | 864 | [IORING_OP_RECV] = { |
fddaface JA |
865 | .needs_mm = 1, |
866 | .needs_file = 1, | |
867 | .unbound_nonreg_file = 1, | |
8a72758c | 868 | .pollin = 1, |
bcda7baa | 869 | .buffer_select = 1, |
fddaface | 870 | }, |
0463b6c5 | 871 | [IORING_OP_OPENAT2] = { |
f86cd20c | 872 | .file_table = 1, |
ff002b30 | 873 | .needs_fs = 1, |
cebdb986 | 874 | }, |
3e4827b0 JA |
875 | [IORING_OP_EPOLL_CTL] = { |
876 | .unbound_nonreg_file = 1, | |
877 | .file_table = 1, | |
878 | }, | |
7d67af2c PB |
879 | [IORING_OP_SPLICE] = { |
880 | .needs_file = 1, | |
881 | .hash_reg_file = 1, | |
882 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
883 | }, |
884 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 885 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
886 | [IORING_OP_TEE] = { |
887 | .needs_file = 1, | |
888 | .hash_reg_file = 1, | |
889 | .unbound_nonreg_file = 1, | |
890 | }, | |
d3656344 JA |
891 | }; |
892 | ||
2e0464d4 BM |
893 | enum io_mem_account { |
894 | ACCT_LOCKED, | |
895 | ACCT_PINNED, | |
896 | }; | |
897 | ||
561fb04a | 898 | static void io_wq_submit_work(struct io_wq_work **workptr); |
78e19bbe | 899 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 900 | static void io_put_req(struct io_kiocb *req); |
978db57e | 901 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
902 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
903 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
904 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
905 | struct io_uring_files_update *ip, | |
906 | unsigned nr_args); | |
f86cd20c | 907 | static int io_grab_files(struct io_kiocb *req); |
99bc4c38 | 908 | static void io_cleanup_req(struct io_kiocb *req); |
b41e9852 JA |
909 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
910 | int fd, struct file **out_file, bool fixed); | |
911 | static void __io_queue_sqe(struct io_kiocb *req, | |
f13fad7b JA |
912 | const struct io_uring_sqe *sqe, |
913 | struct io_comp_state *cs); | |
de0617e4 | 914 | |
b63534c4 JA |
915 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
916 | struct iovec **iovec, struct iov_iter *iter, | |
917 | bool needs_lock); | |
918 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, | |
919 | struct iovec *iovec, struct iovec *fast_iov, | |
920 | struct iov_iter *iter); | |
921 | ||
2b188cc1 JA |
922 | static struct kmem_cache *req_cachep; |
923 | ||
924 | static const struct file_operations io_uring_fops; | |
925 | ||
926 | struct sock *io_uring_get_socket(struct file *file) | |
927 | { | |
928 | #if defined(CONFIG_UNIX) | |
929 | if (file->f_op == &io_uring_fops) { | |
930 | struct io_ring_ctx *ctx = file->private_data; | |
931 | ||
932 | return ctx->ring_sock->sk; | |
933 | } | |
934 | #endif | |
935 | return NULL; | |
936 | } | |
937 | EXPORT_SYMBOL(io_uring_get_socket); | |
938 | ||
4dd2824d PB |
939 | static void io_get_req_task(struct io_kiocb *req) |
940 | { | |
941 | if (req->flags & REQ_F_TASK_PINNED) | |
942 | return; | |
943 | get_task_struct(req->task); | |
944 | req->flags |= REQ_F_TASK_PINNED; | |
945 | } | |
946 | ||
947 | /* not idempotent -- it doesn't clear REQ_F_TASK_PINNED */ | |
948 | static void __io_put_req_task(struct io_kiocb *req) | |
949 | { | |
950 | if (req->flags & REQ_F_TASK_PINNED) | |
951 | put_task_struct(req->task); | |
952 | } | |
953 | ||
4a38aed2 JA |
954 | static void io_file_put_work(struct work_struct *work); |
955 | ||
7cdaf587 XW |
956 | /* |
957 | * Note: must call io_req_init_async() for the first time you | |
958 | * touch any members of io_wq_work. | |
959 | */ | |
960 | static inline void io_req_init_async(struct io_kiocb *req) | |
961 | { | |
962 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
963 | return; | |
964 | ||
965 | memset(&req->work, 0, sizeof(req->work)); | |
966 | req->flags |= REQ_F_WORK_INITIALIZED; | |
967 | } | |
968 | ||
0cdaf760 PB |
969 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
970 | { | |
971 | return ctx->flags & IORING_SETUP_SQPOLL; | |
972 | } | |
973 | ||
2b188cc1 JA |
974 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
975 | { | |
976 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
977 | ||
0f158b4c | 978 | complete(&ctx->ref_comp); |
2b188cc1 JA |
979 | } |
980 | ||
981 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) | |
982 | { | |
983 | struct io_ring_ctx *ctx; | |
78076bb6 | 984 | int hash_bits; |
2b188cc1 JA |
985 | |
986 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
987 | if (!ctx) | |
988 | return NULL; | |
989 | ||
0ddf92e8 JA |
990 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
991 | if (!ctx->fallback_req) | |
992 | goto err; | |
993 | ||
78076bb6 JA |
994 | /* |
995 | * Use 5 bits less than the max cq entries, that should give us around | |
996 | * 32 entries per hash list if totally full and uniformly spread. | |
997 | */ | |
998 | hash_bits = ilog2(p->cq_entries); | |
999 | hash_bits -= 5; | |
1000 | if (hash_bits <= 0) | |
1001 | hash_bits = 1; | |
1002 | ctx->cancel_hash_bits = hash_bits; | |
1003 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1004 | GFP_KERNEL); | |
1005 | if (!ctx->cancel_hash) | |
1006 | goto err; | |
1007 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1008 | ||
21482896 | 1009 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1010 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1011 | goto err; | |
2b188cc1 JA |
1012 | |
1013 | ctx->flags = p->flags; | |
583863ed | 1014 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 1015 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1016 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1017 | init_completion(&ctx->ref_comp); |
1018 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1019 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1020 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1021 | mutex_init(&ctx->uring_lock); |
1022 | init_waitqueue_head(&ctx->wait); | |
1023 | spin_lock_init(&ctx->completion_lock); | |
def596e9 | 1024 | INIT_LIST_HEAD(&ctx->poll_list); |
de0617e4 | 1025 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1026 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1027 | init_waitqueue_head(&ctx->inflight_wait); |
1028 | spin_lock_init(&ctx->inflight_lock); | |
1029 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1030 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1031 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1032 | return ctx; |
206aefde | 1033 | err: |
0ddf92e8 JA |
1034 | if (ctx->fallback_req) |
1035 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1036 | kfree(ctx->cancel_hash); |
206aefde JA |
1037 | kfree(ctx); |
1038 | return NULL; | |
2b188cc1 JA |
1039 | } |
1040 | ||
9d858b21 | 1041 | static inline bool __req_need_defer(struct io_kiocb *req) |
7adf4eaf | 1042 | { |
a197f664 JL |
1043 | struct io_ring_ctx *ctx = req->ctx; |
1044 | ||
31af27c7 PB |
1045 | return req->sequence != ctx->cached_cq_tail |
1046 | + atomic_read(&ctx->cached_cq_overflow); | |
7adf4eaf JA |
1047 | } |
1048 | ||
9d858b21 | 1049 | static inline bool req_need_defer(struct io_kiocb *req) |
de0617e4 | 1050 | { |
87987898 | 1051 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) |
9d858b21 | 1052 | return __req_need_defer(req); |
de0617e4 | 1053 | |
9d858b21 | 1054 | return false; |
de0617e4 JA |
1055 | } |
1056 | ||
de0617e4 | 1057 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1058 | { |
75b28aff | 1059 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1060 | |
07910158 PB |
1061 | /* order cqe stores with ring update */ |
1062 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1063 | |
07910158 PB |
1064 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1065 | wake_up_interruptible(&ctx->cq_wait); | |
1066 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1067 | } |
1068 | } | |
1069 | ||
cccf0ee8 JA |
1070 | static inline void io_req_work_grab_env(struct io_kiocb *req, |
1071 | const struct io_op_def *def) | |
1072 | { | |
1073 | if (!req->work.mm && def->needs_mm) { | |
1074 | mmgrab(current->mm); | |
1075 | req->work.mm = current->mm; | |
2b188cc1 | 1076 | } |
cccf0ee8 JA |
1077 | if (!req->work.creds) |
1078 | req->work.creds = get_current_cred(); | |
ff002b30 JA |
1079 | if (!req->work.fs && def->needs_fs) { |
1080 | spin_lock(¤t->fs->lock); | |
1081 | if (!current->fs->in_exec) { | |
1082 | req->work.fs = current->fs; | |
1083 | req->work.fs->users++; | |
1084 | } else { | |
1085 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1086 | } | |
1087 | spin_unlock(¤t->fs->lock); | |
1088 | } | |
2b188cc1 JA |
1089 | } |
1090 | ||
cccf0ee8 | 1091 | static inline void io_req_work_drop_env(struct io_kiocb *req) |
18d9be1a | 1092 | { |
7cdaf587 XW |
1093 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1094 | return; | |
1095 | ||
cccf0ee8 JA |
1096 | if (req->work.mm) { |
1097 | mmdrop(req->work.mm); | |
1098 | req->work.mm = NULL; | |
1099 | } | |
1100 | if (req->work.creds) { | |
1101 | put_cred(req->work.creds); | |
1102 | req->work.creds = NULL; | |
1103 | } | |
ff002b30 JA |
1104 | if (req->work.fs) { |
1105 | struct fs_struct *fs = req->work.fs; | |
1106 | ||
1107 | spin_lock(&req->work.fs->lock); | |
1108 | if (--fs->users) | |
1109 | fs = NULL; | |
1110 | spin_unlock(&req->work.fs->lock); | |
1111 | if (fs) | |
1112 | free_fs_struct(fs); | |
1113 | } | |
561fb04a JA |
1114 | } |
1115 | ||
8766dd51 | 1116 | static inline void io_prep_async_work(struct io_kiocb *req, |
94ae5e77 | 1117 | struct io_kiocb **link) |
18d9be1a | 1118 | { |
d3656344 | 1119 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1120 | |
d3656344 JA |
1121 | if (req->flags & REQ_F_ISREG) { |
1122 | if (def->hash_reg_file) | |
8766dd51 | 1123 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1124 | } else { |
1125 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1126 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1127 | } |
cccf0ee8 | 1128 | |
59960b9d | 1129 | io_req_init_async(req); |
cccf0ee8 | 1130 | io_req_work_grab_env(req, def); |
54a91f3b | 1131 | |
94ae5e77 | 1132 | *link = io_prep_linked_timeout(req); |
561fb04a JA |
1133 | } |
1134 | ||
a197f664 | 1135 | static inline void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1136 | { |
a197f664 | 1137 | struct io_ring_ctx *ctx = req->ctx; |
94ae5e77 | 1138 | struct io_kiocb *link; |
94ae5e77 | 1139 | |
8766dd51 | 1140 | io_prep_async_work(req, &link); |
561fb04a | 1141 | |
8766dd51 PB |
1142 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1143 | &req->work, req->flags); | |
1144 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1145 | |
1146 | if (link) | |
1147 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1148 | } |
1149 | ||
5262f567 JA |
1150 | static void io_kill_timeout(struct io_kiocb *req) |
1151 | { | |
1152 | int ret; | |
1153 | ||
2d28390a | 1154 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1155 | if (ret != -1) { |
1156 | atomic_inc(&req->ctx->cq_timeouts); | |
842f9612 | 1157 | list_del_init(&req->list); |
f0e20b89 | 1158 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1159 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1160 | io_put_req(req); |
5262f567 JA |
1161 | } |
1162 | } | |
1163 | ||
1164 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1165 | { | |
1166 | struct io_kiocb *req, *tmp; | |
1167 | ||
1168 | spin_lock_irq(&ctx->completion_lock); | |
1169 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, list) | |
1170 | io_kill_timeout(req); | |
1171 | spin_unlock_irq(&ctx->completion_lock); | |
1172 | } | |
1173 | ||
04518945 | 1174 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1175 | { |
04518945 PB |
1176 | do { |
1177 | struct io_kiocb *req = list_first_entry(&ctx->defer_list, | |
1178 | struct io_kiocb, list); | |
de0617e4 | 1179 | |
04518945 PB |
1180 | if (req_need_defer(req)) |
1181 | break; | |
1182 | list_del_init(&req->list); | |
1183 | io_queue_async_work(req); | |
1184 | } while (!list_empty(&ctx->defer_list)); | |
1185 | } | |
1186 | ||
360428f8 | 1187 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1188 | { |
360428f8 PB |
1189 | while (!list_empty(&ctx->timeout_list)) { |
1190 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
1191 | struct io_kiocb, list); | |
de0617e4 | 1192 | |
360428f8 PB |
1193 | if (req->flags & REQ_F_TIMEOUT_NOSEQ) |
1194 | break; | |
bfe68a22 PB |
1195 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1196 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1197 | break; |
bfe68a22 | 1198 | |
360428f8 | 1199 | list_del_init(&req->list); |
5262f567 | 1200 | io_kill_timeout(req); |
360428f8 PB |
1201 | } |
1202 | } | |
5262f567 | 1203 | |
360428f8 PB |
1204 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1205 | { | |
1206 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1207 | __io_commit_cqring(ctx); |
1208 | ||
04518945 PB |
1209 | if (unlikely(!list_empty(&ctx->defer_list))) |
1210 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1211 | } |
1212 | ||
2b188cc1 JA |
1213 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1214 | { | |
75b28aff | 1215 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1216 | unsigned tail; |
1217 | ||
1218 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1219 | /* |
1220 | * writes to the cq entry need to come after reading head; the | |
1221 | * control dependency is enough as we're using WRITE_ONCE to | |
1222 | * fill the cq entry | |
1223 | */ | |
75b28aff | 1224 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1225 | return NULL; |
1226 | ||
1227 | ctx->cached_cq_tail++; | |
75b28aff | 1228 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1229 | } |
1230 | ||
f2842ab5 JA |
1231 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1232 | { | |
f0b493e6 JA |
1233 | if (!ctx->cq_ev_fd) |
1234 | return false; | |
7e55a19c SG |
1235 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1236 | return false; | |
f2842ab5 JA |
1237 | if (!ctx->eventfd_async) |
1238 | return true; | |
b41e9852 | 1239 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1240 | } |
1241 | ||
b41e9852 | 1242 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1243 | { |
1244 | if (waitqueue_active(&ctx->wait)) | |
1245 | wake_up(&ctx->wait); | |
1246 | if (waitqueue_active(&ctx->sqo_wait)) | |
1247 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1248 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1249 | eventfd_signal(ctx->cq_ev_fd, 1); |
1250 | } | |
1251 | ||
c4a2ed72 JA |
1252 | /* Returns true if there are no backlogged entries after the flush */ |
1253 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1254 | { |
1255 | struct io_rings *rings = ctx->rings; | |
1256 | struct io_uring_cqe *cqe; | |
1257 | struct io_kiocb *req; | |
1258 | unsigned long flags; | |
1259 | LIST_HEAD(list); | |
1260 | ||
1261 | if (!force) { | |
1262 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1263 | return true; |
1d7bb1d5 JA |
1264 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1265 | rings->cq_ring_entries)) | |
c4a2ed72 | 1266 | return false; |
1d7bb1d5 JA |
1267 | } |
1268 | ||
1269 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1270 | ||
1271 | /* if force is set, the ring is going away. always drop after that */ | |
1272 | if (force) | |
69b3e546 | 1273 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1274 | |
c4a2ed72 | 1275 | cqe = NULL; |
1d7bb1d5 JA |
1276 | while (!list_empty(&ctx->cq_overflow_list)) { |
1277 | cqe = io_get_cqring(ctx); | |
1278 | if (!cqe && !force) | |
1279 | break; | |
1280 | ||
1281 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
1282 | list); | |
1283 | list_move(&req->list, &list); | |
2ca10259 | 1284 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1285 | if (cqe) { |
1286 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1287 | WRITE_ONCE(cqe->res, req->result); | |
bcda7baa | 1288 | WRITE_ONCE(cqe->flags, req->cflags); |
1d7bb1d5 JA |
1289 | } else { |
1290 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1291 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1296 | if (cqe) { |
1297 | clear_bit(0, &ctx->sq_check_overflow); | |
1298 | clear_bit(0, &ctx->cq_check_overflow); | |
1299 | } | |
1d7bb1d5 JA |
1300 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1301 | io_cqring_ev_posted(ctx); | |
1302 | ||
1303 | while (!list_empty(&list)) { | |
1304 | req = list_first_entry(&list, struct io_kiocb, list); | |
1305 | list_del(&req->list); | |
ec9c02ad | 1306 | io_put_req(req); |
1d7bb1d5 | 1307 | } |
c4a2ed72 JA |
1308 | |
1309 | return cqe != NULL; | |
1d7bb1d5 JA |
1310 | } |
1311 | ||
bcda7baa | 1312 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1313 | { |
78e19bbe | 1314 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1315 | struct io_uring_cqe *cqe; |
1316 | ||
78e19bbe | 1317 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1318 | |
2b188cc1 JA |
1319 | /* |
1320 | * If we can't get a cq entry, userspace overflowed the | |
1321 | * submission (by quite a lot). Increment the overflow count in | |
1322 | * the ring. | |
1323 | */ | |
1324 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1325 | if (likely(cqe)) { |
78e19bbe | 1326 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1327 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1328 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1329 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1330 | WRITE_ONCE(ctx->rings->cq_overflow, |
1331 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1332 | } else { |
ad3eb2c8 JA |
1333 | if (list_empty(&ctx->cq_overflow_list)) { |
1334 | set_bit(0, &ctx->sq_check_overflow); | |
1335 | set_bit(0, &ctx->cq_check_overflow); | |
1336 | } | |
2ca10259 | 1337 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1338 | refcount_inc(&req->refs); |
1339 | req->result = res; | |
bcda7baa | 1340 | req->cflags = cflags; |
1d7bb1d5 | 1341 | list_add_tail(&req->list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1342 | } |
1343 | } | |
1344 | ||
bcda7baa JA |
1345 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1346 | { | |
1347 | __io_cqring_fill_event(req, res, 0); | |
1348 | } | |
1349 | ||
e1e16097 | 1350 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1351 | { |
78e19bbe | 1352 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1353 | unsigned long flags; |
1354 | ||
1355 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1356 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1357 | io_commit_cqring(ctx); |
1358 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1359 | ||
8c838788 | 1360 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1361 | } |
1362 | ||
229a7b63 | 1363 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1364 | { |
229a7b63 JA |
1365 | struct io_ring_ctx *ctx = cs->ctx; |
1366 | ||
1367 | spin_lock_irq(&ctx->completion_lock); | |
1368 | while (!list_empty(&cs->list)) { | |
1369 | struct io_kiocb *req; | |
1370 | ||
1371 | req = list_first_entry(&cs->list, struct io_kiocb, list); | |
1372 | list_del(&req->list); | |
1373 | io_cqring_fill_event(req, req->result); | |
1374 | if (!(req->flags & REQ_F_LINK_HEAD)) { | |
1375 | req->flags |= REQ_F_COMP_LOCKED; | |
1376 | io_put_req(req); | |
1377 | } else { | |
1378 | spin_unlock_irq(&ctx->completion_lock); | |
1379 | io_put_req(req); | |
1380 | spin_lock_irq(&ctx->completion_lock); | |
1381 | } | |
1382 | } | |
1383 | io_commit_cqring(ctx); | |
1384 | spin_unlock_irq(&ctx->completion_lock); | |
1385 | ||
1386 | io_cqring_ev_posted(ctx); | |
1387 | cs->nr = 0; | |
1388 | } | |
1389 | ||
1390 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1391 | struct io_comp_state *cs) | |
1392 | { | |
1393 | if (!cs) { | |
1394 | io_cqring_add_event(req, res, cflags); | |
1395 | io_put_req(req); | |
1396 | } else { | |
1397 | req->result = res; | |
1398 | list_add_tail(&req->list, &cs->list); | |
1399 | if (++cs->nr >= 32) | |
1400 | io_submit_flush_completions(cs); | |
1401 | } | |
e1e16097 JA |
1402 | } |
1403 | ||
1404 | static void io_req_complete(struct io_kiocb *req, long res) | |
1405 | { | |
229a7b63 | 1406 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1407 | } |
1408 | ||
0ddf92e8 JA |
1409 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1410 | { | |
1411 | return req == (struct io_kiocb *) | |
1412 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1413 | } | |
1414 | ||
1415 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1416 | { | |
1417 | struct io_kiocb *req; | |
1418 | ||
1419 | req = ctx->fallback_req; | |
dd461af6 | 1420 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1421 | return req; |
1422 | ||
1423 | return NULL; | |
1424 | } | |
1425 | ||
0553b8bd PB |
1426 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1427 | struct io_submit_state *state) | |
2b188cc1 | 1428 | { |
fd6fab2c | 1429 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1430 | struct io_kiocb *req; |
1431 | ||
f6b6c7d6 | 1432 | if (!state->free_reqs) { |
2579f913 JA |
1433 | size_t sz; |
1434 | int ret; | |
1435 | ||
1436 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1437 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1438 | ||
1439 | /* | |
1440 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1441 | * retry single alloc to be on the safe side. | |
1442 | */ | |
1443 | if (unlikely(ret <= 0)) { | |
1444 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1445 | if (!state->reqs[0]) | |
0ddf92e8 | 1446 | goto fallback; |
fd6fab2c JA |
1447 | ret = 1; |
1448 | } | |
2579f913 | 1449 | state->free_reqs = ret - 1; |
6c8a3134 | 1450 | req = state->reqs[ret - 1]; |
2579f913 | 1451 | } else { |
2579f913 | 1452 | state->free_reqs--; |
6c8a3134 | 1453 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1454 | } |
1455 | ||
2579f913 | 1456 | return req; |
0ddf92e8 | 1457 | fallback: |
0553b8bd | 1458 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1459 | } |
1460 | ||
8da11c19 PB |
1461 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1462 | bool fixed) | |
1463 | { | |
1464 | if (fixed) | |
05589553 | 1465 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1466 | else |
1467 | fput(file); | |
1468 | } | |
1469 | ||
c6ca97b3 | 1470 | static void __io_req_aux_free(struct io_kiocb *req) |
2b188cc1 | 1471 | { |
929a3af9 PB |
1472 | if (req->flags & REQ_F_NEED_CLEANUP) |
1473 | io_cleanup_req(req); | |
1474 | ||
96fd84d8 | 1475 | kfree(req->io); |
8da11c19 PB |
1476 | if (req->file) |
1477 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
4dd2824d | 1478 | __io_put_req_task(req); |
cccf0ee8 | 1479 | io_req_work_drop_env(req); |
def596e9 JA |
1480 | } |
1481 | ||
9e645e11 | 1482 | static void __io_free_req(struct io_kiocb *req) |
2b188cc1 | 1483 | { |
c6ca97b3 | 1484 | __io_req_aux_free(req); |
fcb323cc | 1485 | |
fcb323cc | 1486 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1487 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1488 | unsigned long flags; |
1489 | ||
1490 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1491 | list_del(&req->inflight_entry); | |
1492 | if (waitqueue_active(&ctx->inflight_wait)) | |
1493 | wake_up(&ctx->inflight_wait); | |
1494 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1495 | } | |
2b85edfc PB |
1496 | |
1497 | percpu_ref_put(&req->ctx->refs); | |
b1e50e54 PB |
1498 | if (likely(!io_is_fallback_req(req))) |
1499 | kmem_cache_free(req_cachep, req); | |
1500 | else | |
dd461af6 | 1501 | clear_bit_unlock(0, (unsigned long *) &req->ctx->fallback_req); |
e65ef56d JA |
1502 | } |
1503 | ||
c6ca97b3 JA |
1504 | struct req_batch { |
1505 | void *reqs[IO_IOPOLL_BATCH]; | |
1506 | int to_free; | |
1507 | int need_iter; | |
1508 | }; | |
1509 | ||
1510 | static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) | |
1511 | { | |
1512 | if (!rb->to_free) | |
1513 | return; | |
1514 | if (rb->need_iter) { | |
1515 | int i, inflight = 0; | |
1516 | unsigned long flags; | |
1517 | ||
1518 | for (i = 0; i < rb->to_free; i++) { | |
1519 | struct io_kiocb *req = rb->reqs[i]; | |
1520 | ||
c6ca97b3 JA |
1521 | if (req->flags & REQ_F_INFLIGHT) |
1522 | inflight++; | |
c6ca97b3 JA |
1523 | __io_req_aux_free(req); |
1524 | } | |
1525 | if (!inflight) | |
1526 | goto do_free; | |
1527 | ||
1528 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1529 | for (i = 0; i < rb->to_free; i++) { | |
1530 | struct io_kiocb *req = rb->reqs[i]; | |
1531 | ||
10fef4be | 1532 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 JA |
1533 | list_del(&req->inflight_entry); |
1534 | if (!--inflight) | |
1535 | break; | |
1536 | } | |
1537 | } | |
1538 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1539 | ||
1540 | if (waitqueue_active(&ctx->inflight_wait)) | |
1541 | wake_up(&ctx->inflight_wait); | |
1542 | } | |
1543 | do_free: | |
1544 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1545 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
c6ca97b3 | 1546 | rb->to_free = rb->need_iter = 0; |
e65ef56d JA |
1547 | } |
1548 | ||
a197f664 | 1549 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1550 | { |
a197f664 | 1551 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1552 | int ret; |
1553 | ||
2d28390a | 1554 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1555 | if (ret != -1) { |
78e19bbe | 1556 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1557 | io_commit_cqring(ctx); |
dea3b49c | 1558 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1559 | io_put_req(req); |
2665abfd JA |
1560 | return true; |
1561 | } | |
1562 | ||
1563 | return false; | |
e65ef56d JA |
1564 | } |
1565 | ||
ba816ad6 | 1566 | static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
9e645e11 | 1567 | { |
2665abfd | 1568 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1569 | bool wake_ev = false; |
9e645e11 | 1570 | |
4d7dd462 JA |
1571 | /* Already got next link */ |
1572 | if (req->flags & REQ_F_LINK_NEXT) | |
1573 | return; | |
1574 | ||
9e645e11 JA |
1575 | /* |
1576 | * The list should never be empty when we are called here. But could | |
1577 | * potentially happen if the chain is messed up, check to be on the | |
1578 | * safe side. | |
1579 | */ | |
4493233e PB |
1580 | while (!list_empty(&req->link_list)) { |
1581 | struct io_kiocb *nxt = list_first_entry(&req->link_list, | |
1582 | struct io_kiocb, link_list); | |
94ae5e77 | 1583 | |
4493233e PB |
1584 | if (unlikely((req->flags & REQ_F_LINK_TIMEOUT) && |
1585 | (nxt->flags & REQ_F_TIMEOUT))) { | |
1586 | list_del_init(&nxt->link_list); | |
94ae5e77 | 1587 | wake_ev |= io_link_cancel_timeout(nxt); |
94ae5e77 JA |
1588 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
1589 | continue; | |
1590 | } | |
9e645e11 | 1591 | |
4493233e PB |
1592 | list_del_init(&req->link_list); |
1593 | if (!list_empty(&nxt->link_list)) | |
dea3b49c | 1594 | nxt->flags |= REQ_F_LINK_HEAD; |
b18fdf71 | 1595 | *nxtptr = nxt; |
94ae5e77 | 1596 | break; |
9e645e11 | 1597 | } |
2665abfd | 1598 | |
4d7dd462 | 1599 | req->flags |= REQ_F_LINK_NEXT; |
2665abfd JA |
1600 | if (wake_ev) |
1601 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1602 | } |
1603 | ||
1604 | /* | |
dea3b49c | 1605 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 JA |
1606 | */ |
1607 | static void io_fail_links(struct io_kiocb *req) | |
1608 | { | |
2665abfd | 1609 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1610 | unsigned long flags; |
1611 | ||
1612 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
9e645e11 JA |
1613 | |
1614 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1615 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1616 | struct io_kiocb, link_list); | |
9e645e11 | 1617 | |
4493233e | 1618 | list_del_init(&link->link_list); |
c826bd7a | 1619 | trace_io_uring_fail_link(req, link); |
2665abfd JA |
1620 | |
1621 | if ((req->flags & REQ_F_LINK_TIMEOUT) && | |
d625c6ee | 1622 | link->opcode == IORING_OP_LINK_TIMEOUT) { |
a197f664 | 1623 | io_link_cancel_timeout(link); |
2665abfd | 1624 | } else { |
78e19bbe | 1625 | io_cqring_fill_event(link, -ECANCELED); |
978db57e | 1626 | __io_double_put_req(link); |
2665abfd | 1627 | } |
5d960724 | 1628 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1629 | } |
2665abfd JA |
1630 | |
1631 | io_commit_cqring(ctx); | |
1632 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1633 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1634 | } |
1635 | ||
4d7dd462 | 1636 | static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) |
9e645e11 | 1637 | { |
dea3b49c | 1638 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) |
2665abfd | 1639 | return; |
2665abfd | 1640 | |
9e645e11 JA |
1641 | /* |
1642 | * If LINK is set, we have dependent requests in this chain. If we | |
1643 | * didn't fail this request, queue the first one up, moving any other | |
1644 | * dependencies to the next request. In case of failure, fail the rest | |
1645 | * of the chain. | |
1646 | */ | |
2665abfd JA |
1647 | if (req->flags & REQ_F_FAIL_LINK) { |
1648 | io_fail_links(req); | |
7c9e7f0f JA |
1649 | } else if ((req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_COMP_LOCKED)) == |
1650 | REQ_F_LINK_TIMEOUT) { | |
2665abfd JA |
1651 | struct io_ring_ctx *ctx = req->ctx; |
1652 | unsigned long flags; | |
1653 | ||
1654 | /* | |
1655 | * If this is a timeout link, we could be racing with the | |
1656 | * timeout timer. Grab the completion lock for this case to | |
7c9e7f0f | 1657 | * protect against that. |
2665abfd JA |
1658 | */ |
1659 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1660 | io_req_link_next(req, nxt); | |
1661 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1662 | } else { | |
1663 | io_req_link_next(req, nxt); | |
9e645e11 | 1664 | } |
4d7dd462 | 1665 | } |
9e645e11 | 1666 | |
c69f8dbe JL |
1667 | static void io_free_req(struct io_kiocb *req) |
1668 | { | |
944e58bf PB |
1669 | struct io_kiocb *nxt = NULL; |
1670 | ||
1671 | io_req_find_next(req, &nxt); | |
70cf9f32 | 1672 | __io_free_req(req); |
944e58bf PB |
1673 | |
1674 | if (nxt) | |
1675 | io_queue_async_work(nxt); | |
c69f8dbe JL |
1676 | } |
1677 | ||
7a743e22 PB |
1678 | static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) |
1679 | { | |
1680 | struct io_kiocb *link; | |
8766dd51 PB |
1681 | const struct io_op_def *def = &io_op_defs[nxt->opcode]; |
1682 | ||
1683 | if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file) | |
1684 | io_wq_hash_work(&nxt->work, file_inode(nxt->file)); | |
7a743e22 PB |
1685 | |
1686 | *workptr = &nxt->work; | |
1687 | link = io_prep_linked_timeout(nxt); | |
18a542ff | 1688 | if (link) |
d4c81f38 | 1689 | nxt->flags |= REQ_F_QUEUE_TIMEOUT; |
7a743e22 PB |
1690 | } |
1691 | ||
ba816ad6 JA |
1692 | /* |
1693 | * Drop reference to request, return next in chain (if there is one) if this | |
1694 | * was the last reference to this request. | |
1695 | */ | |
f9bd67f6 | 1696 | __attribute__((nonnull)) |
ec9c02ad | 1697 | static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
e65ef56d | 1698 | { |
2a44f467 JA |
1699 | if (refcount_dec_and_test(&req->refs)) { |
1700 | io_req_find_next(req, nxtptr); | |
4d7dd462 | 1701 | __io_free_req(req); |
2a44f467 | 1702 | } |
2b188cc1 JA |
1703 | } |
1704 | ||
e65ef56d JA |
1705 | static void io_put_req(struct io_kiocb *req) |
1706 | { | |
1707 | if (refcount_dec_and_test(&req->refs)) | |
1708 | io_free_req(req); | |
2b188cc1 JA |
1709 | } |
1710 | ||
e9fd9396 PB |
1711 | static void io_steal_work(struct io_kiocb *req, |
1712 | struct io_wq_work **workptr) | |
7a743e22 PB |
1713 | { |
1714 | /* | |
1715 | * It's in an io-wq worker, so there always should be at least | |
1716 | * one reference, which will be dropped in io_put_work() just | |
1717 | * after the current handler returns. | |
1718 | * | |
1719 | * It also means, that if the counter dropped to 1, then there is | |
1720 | * no asynchronous users left, so it's safe to steal the next work. | |
1721 | */ | |
7a743e22 PB |
1722 | if (refcount_read(&req->refs) == 1) { |
1723 | struct io_kiocb *nxt = NULL; | |
1724 | ||
1725 | io_req_find_next(req, &nxt); | |
1726 | if (nxt) | |
1727 | io_wq_assign_next(workptr, nxt); | |
1728 | } | |
1729 | } | |
1730 | ||
978db57e JA |
1731 | /* |
1732 | * Must only be used if we don't need to care about links, usually from | |
1733 | * within the completion handling itself. | |
1734 | */ | |
1735 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1736 | { |
1737 | /* drop both submit and complete references */ | |
1738 | if (refcount_sub_and_test(2, &req->refs)) | |
1739 | __io_free_req(req); | |
1740 | } | |
1741 | ||
978db57e JA |
1742 | static void io_double_put_req(struct io_kiocb *req) |
1743 | { | |
1744 | /* drop both submit and complete references */ | |
1745 | if (refcount_sub_and_test(2, &req->refs)) | |
1746 | io_free_req(req); | |
1747 | } | |
1748 | ||
1d7bb1d5 | 1749 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1750 | { |
84f97dc2 JA |
1751 | struct io_rings *rings = ctx->rings; |
1752 | ||
ad3eb2c8 JA |
1753 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1754 | /* | |
1755 | * noflush == true is from the waitqueue handler, just ensure | |
1756 | * we wake up the task, and the next invocation will flush the | |
1757 | * entries. We cannot safely to it from here. | |
1758 | */ | |
1759 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1760 | return -1U; | |
1d7bb1d5 | 1761 | |
ad3eb2c8 JA |
1762 | io_cqring_overflow_flush(ctx, false); |
1763 | } | |
1d7bb1d5 | 1764 | |
a3a0e43f JA |
1765 | /* See comment at the top of this file */ |
1766 | smp_rmb(); | |
ad3eb2c8 | 1767 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1768 | } |
1769 | ||
fb5ccc98 PB |
1770 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1771 | { | |
1772 | struct io_rings *rings = ctx->rings; | |
1773 | ||
1774 | /* make sure SQ entry isn't read before tail */ | |
1775 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1776 | } | |
1777 | ||
8237e045 | 1778 | static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) |
e94f141b | 1779 | { |
dea3b49c | 1780 | if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req)) |
c6ca97b3 | 1781 | return false; |
e94f141b | 1782 | |
9d9e88a2 | 1783 | if (req->file || req->io) |
c6ca97b3 JA |
1784 | rb->need_iter++; |
1785 | ||
1786 | rb->reqs[rb->to_free++] = req; | |
1787 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1788 | io_free_req_many(req->ctx, rb); | |
1789 | return true; | |
e94f141b JA |
1790 | } |
1791 | ||
bcda7baa JA |
1792 | static int io_put_kbuf(struct io_kiocb *req) |
1793 | { | |
4d954c25 | 1794 | struct io_buffer *kbuf; |
bcda7baa JA |
1795 | int cflags; |
1796 | ||
4d954c25 | 1797 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1798 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1799 | cflags |= IORING_CQE_F_BUFFER; | |
1800 | req->rw.addr = 0; | |
1801 | kfree(kbuf); | |
1802 | return cflags; | |
1803 | } | |
1804 | ||
bbde017a XW |
1805 | static void io_iopoll_queue(struct list_head *again) |
1806 | { | |
1807 | struct io_kiocb *req; | |
1808 | ||
1809 | do { | |
1810 | req = list_first_entry(again, struct io_kiocb, list); | |
1811 | list_del(&req->list); | |
1812 | refcount_inc(&req->refs); | |
1813 | io_queue_async_work(req); | |
1814 | } while (!list_empty(again)); | |
1815 | } | |
1816 | ||
def596e9 JA |
1817 | /* |
1818 | * Find and free completed poll iocbs | |
1819 | */ | |
1820 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1821 | struct list_head *done) | |
1822 | { | |
8237e045 | 1823 | struct req_batch rb; |
def596e9 | 1824 | struct io_kiocb *req; |
bbde017a XW |
1825 | LIST_HEAD(again); |
1826 | ||
1827 | /* order with ->result store in io_complete_rw_iopoll() */ | |
1828 | smp_rmb(); | |
def596e9 | 1829 | |
c6ca97b3 | 1830 | rb.to_free = rb.need_iter = 0; |
def596e9 | 1831 | while (!list_empty(done)) { |
bcda7baa JA |
1832 | int cflags = 0; |
1833 | ||
def596e9 | 1834 | req = list_first_entry(done, struct io_kiocb, list); |
bbde017a XW |
1835 | if (READ_ONCE(req->result) == -EAGAIN) { |
1836 | req->iopoll_completed = 0; | |
1837 | list_move_tail(&req->list, &again); | |
1838 | continue; | |
1839 | } | |
def596e9 JA |
1840 | list_del(&req->list); |
1841 | ||
bcda7baa JA |
1842 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1843 | cflags = io_put_kbuf(req); | |
1844 | ||
1845 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1846 | (*nr_events)++; |
1847 | ||
8237e045 JA |
1848 | if (refcount_dec_and_test(&req->refs) && |
1849 | !io_req_multi_free(&rb, req)) | |
1850 | io_free_req(req); | |
def596e9 | 1851 | } |
def596e9 | 1852 | |
09bb8394 | 1853 | io_commit_cqring(ctx); |
32b2244a XW |
1854 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1855 | io_cqring_ev_posted(ctx); | |
8237e045 | 1856 | io_free_req_many(ctx, &rb); |
581f9810 | 1857 | |
bbde017a XW |
1858 | if (!list_empty(&again)) |
1859 | io_iopoll_queue(&again); | |
581f9810 BM |
1860 | } |
1861 | ||
def596e9 JA |
1862 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
1863 | long min) | |
1864 | { | |
1865 | struct io_kiocb *req, *tmp; | |
1866 | LIST_HEAD(done); | |
1867 | bool spin; | |
1868 | int ret; | |
1869 | ||
1870 | /* | |
1871 | * Only spin for completions if we don't have multiple devices hanging | |
1872 | * off our complete list, and we're under the requested amount. | |
1873 | */ | |
1874 | spin = !ctx->poll_multi_file && *nr_events < min; | |
1875 | ||
1876 | ret = 0; | |
1877 | list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) { | |
9adbd45d | 1878 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
1879 | |
1880 | /* | |
581f9810 BM |
1881 | * Move completed and retryable entries to our local lists. |
1882 | * If we find a request that requires polling, break out | |
1883 | * and complete those lists first, if we have entries there. | |
def596e9 | 1884 | */ |
65a6543d | 1885 | if (READ_ONCE(req->iopoll_completed)) { |
def596e9 JA |
1886 | list_move_tail(&req->list, &done); |
1887 | continue; | |
1888 | } | |
1889 | if (!list_empty(&done)) | |
1890 | break; | |
1891 | ||
1892 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
1893 | if (ret < 0) | |
1894 | break; | |
1895 | ||
1896 | if (ret && spin) | |
1897 | spin = false; | |
1898 | ret = 0; | |
1899 | } | |
1900 | ||
1901 | if (!list_empty(&done)) | |
1902 | io_iopoll_complete(ctx, nr_events, &done); | |
1903 | ||
1904 | return ret; | |
1905 | } | |
1906 | ||
1907 | /* | |
d195a66e | 1908 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
1909 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
1910 | * as a non-spinning completion check. | |
1911 | */ | |
1912 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1913 | long min) | |
1914 | { | |
08f5439f | 1915 | while (!list_empty(&ctx->poll_list) && !need_resched()) { |
def596e9 JA |
1916 | int ret; |
1917 | ||
1918 | ret = io_do_iopoll(ctx, nr_events, min); | |
1919 | if (ret < 0) | |
1920 | return ret; | |
1921 | if (!min || *nr_events >= min) | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | return 1; | |
1926 | } | |
1927 | ||
1928 | /* | |
1929 | * We can't just wait for polled events to come to us, we have to actively | |
1930 | * find and complete them. | |
1931 | */ | |
1932 | static void io_iopoll_reap_events(struct io_ring_ctx *ctx) | |
1933 | { | |
1934 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
1935 | return; | |
1936 | ||
1937 | mutex_lock(&ctx->uring_lock); | |
1938 | while (!list_empty(&ctx->poll_list)) { | |
1939 | unsigned int nr_events = 0; | |
1940 | ||
1941 | io_iopoll_getevents(ctx, &nr_events, 1); | |
08f5439f JA |
1942 | |
1943 | /* | |
1944 | * Ensure we allow local-to-the-cpu processing to take place, | |
1945 | * in this case we need to ensure that we reap all events. | |
1946 | */ | |
1947 | cond_resched(); | |
def596e9 JA |
1948 | } |
1949 | mutex_unlock(&ctx->uring_lock); | |
1950 | } | |
1951 | ||
c7849be9 XW |
1952 | static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events, |
1953 | long min) | |
def596e9 | 1954 | { |
2b2ed975 | 1955 | int iters = 0, ret = 0; |
500f9fba | 1956 | |
c7849be9 XW |
1957 | /* |
1958 | * We disallow the app entering submit/complete with polling, but we | |
1959 | * still need to lock the ring to prevent racing with polled issue | |
1960 | * that got punted to a workqueue. | |
1961 | */ | |
1962 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
1963 | do { |
1964 | int tmin = 0; | |
1965 | ||
a3a0e43f JA |
1966 | /* |
1967 | * Don't enter poll loop if we already have events pending. | |
1968 | * If we do, we can potentially be spinning for commands that | |
1969 | * already triggered a CQE (eg in error). | |
1970 | */ | |
1d7bb1d5 | 1971 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
1972 | break; |
1973 | ||
500f9fba JA |
1974 | /* |
1975 | * If a submit got punted to a workqueue, we can have the | |
1976 | * application entering polling for a command before it gets | |
1977 | * issued. That app will hold the uring_lock for the duration | |
1978 | * of the poll right here, so we need to take a breather every | |
1979 | * now and then to ensure that the issue has a chance to add | |
1980 | * the poll to the issued list. Otherwise we can spin here | |
1981 | * forever, while the workqueue is stuck trying to acquire the | |
1982 | * very same mutex. | |
1983 | */ | |
1984 | if (!(++iters & 7)) { | |
1985 | mutex_unlock(&ctx->uring_lock); | |
1986 | mutex_lock(&ctx->uring_lock); | |
1987 | } | |
1988 | ||
def596e9 JA |
1989 | if (*nr_events < min) |
1990 | tmin = min - *nr_events; | |
1991 | ||
1992 | ret = io_iopoll_getevents(ctx, nr_events, tmin); | |
1993 | if (ret <= 0) | |
1994 | break; | |
1995 | ret = 0; | |
1996 | } while (min && !*nr_events && !need_resched()); | |
1997 | ||
500f9fba | 1998 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
1999 | return ret; |
2000 | } | |
2001 | ||
491381ce | 2002 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2003 | { |
491381ce JA |
2004 | /* |
2005 | * Tell lockdep we inherited freeze protection from submission | |
2006 | * thread. | |
2007 | */ | |
2008 | if (req->flags & REQ_F_ISREG) { | |
2009 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2010 | |
491381ce | 2011 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2012 | } |
491381ce | 2013 | file_end_write(req->file); |
2b188cc1 JA |
2014 | } |
2015 | ||
4e88d6e7 JA |
2016 | static inline void req_set_fail_links(struct io_kiocb *req) |
2017 | { | |
2018 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
2019 | req->flags |= REQ_F_FAIL_LINK; | |
2020 | } | |
2021 | ||
ba816ad6 | 2022 | static void io_complete_rw_common(struct kiocb *kiocb, long res) |
2b188cc1 | 2023 | { |
9adbd45d | 2024 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2025 | int cflags = 0; |
2b188cc1 | 2026 | |
491381ce JA |
2027 | if (kiocb->ki_flags & IOCB_WRITE) |
2028 | kiocb_end_write(req); | |
2b188cc1 | 2029 | |
4e88d6e7 JA |
2030 | if (res != req->result) |
2031 | req_set_fail_links(req); | |
bcda7baa JA |
2032 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2033 | cflags = io_put_kbuf(req); | |
e1e16097 | 2034 | io_cqring_add_event(req, res, cflags); |
ba816ad6 JA |
2035 | } |
2036 | ||
b63534c4 JA |
2037 | static void io_sq_thread_drop_mm(struct io_ring_ctx *ctx) |
2038 | { | |
2039 | struct mm_struct *mm = current->mm; | |
2040 | ||
2041 | if (mm) { | |
2042 | kthread_unuse_mm(mm); | |
2043 | mmput(mm); | |
2044 | } | |
2045 | } | |
2046 | ||
d3cac64c | 2047 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) |
b63534c4 | 2048 | { |
d3cac64c | 2049 | if (!current->mm) { |
b63534c4 JA |
2050 | if (unlikely(!mmget_not_zero(ctx->sqo_mm))) |
2051 | return -EFAULT; | |
2052 | kthread_use_mm(ctx->sqo_mm); | |
2053 | } | |
2054 | ||
2055 | return 0; | |
2056 | } | |
2057 | ||
d3cac64c PB |
2058 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, |
2059 | struct io_kiocb *req) | |
2060 | { | |
2061 | if (!io_op_defs[req->opcode].needs_mm) | |
2062 | return 0; | |
2063 | return __io_sq_thread_acquire_mm(ctx); | |
2064 | } | |
2065 | ||
b63534c4 JA |
2066 | #ifdef CONFIG_BLOCK |
2067 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2068 | { | |
2069 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2070 | ssize_t ret = -ECANCELED; | |
2071 | struct iov_iter iter; | |
2072 | int rw; | |
2073 | ||
2074 | if (error) { | |
2075 | ret = error; | |
2076 | goto end_req; | |
2077 | } | |
2078 | ||
2079 | switch (req->opcode) { | |
2080 | case IORING_OP_READV: | |
2081 | case IORING_OP_READ_FIXED: | |
2082 | case IORING_OP_READ: | |
2083 | rw = READ; | |
2084 | break; | |
2085 | case IORING_OP_WRITEV: | |
2086 | case IORING_OP_WRITE_FIXED: | |
2087 | case IORING_OP_WRITE: | |
2088 | rw = WRITE; | |
2089 | break; | |
2090 | default: | |
2091 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2092 | req->opcode); | |
2093 | goto end_req; | |
2094 | } | |
2095 | ||
2096 | ret = io_import_iovec(rw, req, &iovec, &iter, false); | |
2097 | if (ret < 0) | |
2098 | goto end_req; | |
2099 | ret = io_setup_async_rw(req, ret, iovec, inline_vecs, &iter); | |
2100 | if (!ret) | |
2101 | return true; | |
2102 | kfree(iovec); | |
2103 | end_req: | |
b63534c4 | 2104 | req_set_fail_links(req); |
e1e16097 | 2105 | io_req_complete(req, ret); |
b63534c4 JA |
2106 | return false; |
2107 | } | |
2108 | ||
2109 | static void io_rw_resubmit(struct callback_head *cb) | |
2110 | { | |
2111 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2112 | struct io_ring_ctx *ctx = req->ctx; | |
2113 | int err; | |
2114 | ||
2115 | __set_current_state(TASK_RUNNING); | |
2116 | ||
2117 | err = io_sq_thread_acquire_mm(ctx, req); | |
2118 | ||
2119 | if (io_resubmit_prep(req, err)) { | |
2120 | refcount_inc(&req->refs); | |
2121 | io_queue_async_work(req); | |
2122 | } | |
2123 | } | |
2124 | #endif | |
2125 | ||
2126 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2127 | { | |
2128 | #ifdef CONFIG_BLOCK | |
2129 | struct task_struct *tsk; | |
2130 | int ret; | |
2131 | ||
2132 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) | |
2133 | return false; | |
2134 | ||
2135 | tsk = req->task; | |
2136 | init_task_work(&req->task_work, io_rw_resubmit); | |
2137 | ret = task_work_add(tsk, &req->task_work, true); | |
2138 | if (!ret) | |
2139 | return true; | |
2140 | #endif | |
2141 | return false; | |
2142 | } | |
2143 | ||
ba816ad6 JA |
2144 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) |
2145 | { | |
9adbd45d | 2146 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2147 | |
b63534c4 JA |
2148 | if (!io_rw_reissue(req, res)) { |
2149 | io_complete_rw_common(kiocb, res); | |
2150 | io_put_req(req); | |
2151 | } | |
2b188cc1 JA |
2152 | } |
2153 | ||
def596e9 JA |
2154 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2155 | { | |
9adbd45d | 2156 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2157 | |
491381ce JA |
2158 | if (kiocb->ki_flags & IOCB_WRITE) |
2159 | kiocb_end_write(req); | |
def596e9 | 2160 | |
2d7d6792 | 2161 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2162 | req_set_fail_links(req); |
bbde017a XW |
2163 | |
2164 | WRITE_ONCE(req->result, res); | |
2165 | /* order with io_poll_complete() checking ->result */ | |
2166 | if (res != -EAGAIN) { | |
2167 | smp_wmb(); | |
65a6543d | 2168 | WRITE_ONCE(req->iopoll_completed, 1); |
bbde017a | 2169 | } |
def596e9 JA |
2170 | } |
2171 | ||
2172 | /* | |
2173 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2174 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2175 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2176 | * accessing the kiocb cookie. | |
2177 | */ | |
2178 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2179 | { | |
2180 | struct io_ring_ctx *ctx = req->ctx; | |
2181 | ||
2182 | /* | |
2183 | * Track whether we have multiple files in our lists. This will impact | |
2184 | * how we do polling eventually, not spinning if we're on potentially | |
2185 | * different devices. | |
2186 | */ | |
2187 | if (list_empty(&ctx->poll_list)) { | |
2188 | ctx->poll_multi_file = false; | |
2189 | } else if (!ctx->poll_multi_file) { | |
2190 | struct io_kiocb *list_req; | |
2191 | ||
2192 | list_req = list_first_entry(&ctx->poll_list, struct io_kiocb, | |
2193 | list); | |
9adbd45d | 2194 | if (list_req->file != req->file) |
def596e9 JA |
2195 | ctx->poll_multi_file = true; |
2196 | } | |
2197 | ||
2198 | /* | |
2199 | * For fast devices, IO may have already completed. If it has, add | |
2200 | * it to the front so we find it first. | |
2201 | */ | |
65a6543d | 2202 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2203 | list_add(&req->list, &ctx->poll_list); |
2204 | else | |
2205 | list_add_tail(&req->list, &ctx->poll_list); | |
bdcd3eab XW |
2206 | |
2207 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2208 | wq_has_sleeper(&ctx->sqo_wait)) | |
2209 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2210 | } |
2211 | ||
9f13c35b | 2212 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2213 | { |
9f13c35b | 2214 | int diff = state->has_refs - state->used_refs; |
9a56a232 | 2215 | |
9f13c35b PB |
2216 | if (diff) |
2217 | fput_many(state->file, diff); | |
2218 | state->file = NULL; | |
2219 | } | |
2220 | ||
2221 | static inline void io_state_file_put(struct io_submit_state *state) | |
2222 | { | |
2223 | if (state->file) | |
2224 | __io_state_file_put(state); | |
9a56a232 JA |
2225 | } |
2226 | ||
2227 | /* | |
2228 | * Get as many references to a file as we have IOs left in this submission, | |
2229 | * assuming most submissions are for one file, or at least that each file | |
2230 | * has more than one submission. | |
2231 | */ | |
8da11c19 | 2232 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2233 | { |
2234 | if (!state) | |
2235 | return fget(fd); | |
2236 | ||
2237 | if (state->file) { | |
2238 | if (state->fd == fd) { | |
2239 | state->used_refs++; | |
2240 | state->ios_left--; | |
2241 | return state->file; | |
2242 | } | |
9f13c35b | 2243 | __io_state_file_put(state); |
9a56a232 JA |
2244 | } |
2245 | state->file = fget_many(fd, state->ios_left); | |
2246 | if (!state->file) | |
2247 | return NULL; | |
2248 | ||
2249 | state->fd = fd; | |
2250 | state->has_refs = state->ios_left; | |
2251 | state->used_refs = 1; | |
2252 | state->ios_left--; | |
2253 | return state->file; | |
2254 | } | |
2255 | ||
4503b767 JA |
2256 | static bool io_bdev_nowait(struct block_device *bdev) |
2257 | { | |
2258 | #ifdef CONFIG_BLOCK | |
2259 | return !bdev || queue_is_mq(bdev_get_queue(bdev)); | |
2260 | #else | |
2261 | return true; | |
2262 | #endif | |
2263 | } | |
2264 | ||
2b188cc1 JA |
2265 | /* |
2266 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2267 | * any file. For now, just ensure that anything potentially problematic is done | |
2268 | * inline. | |
2269 | */ | |
af197f50 | 2270 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2271 | { |
2272 | umode_t mode = file_inode(file)->i_mode; | |
2273 | ||
4503b767 JA |
2274 | if (S_ISBLK(mode)) { |
2275 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2276 | return true; | |
2277 | return false; | |
2278 | } | |
2279 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2280 | return true; |
4503b767 JA |
2281 | if (S_ISREG(mode)) { |
2282 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2283 | file->f_op != &io_uring_fops) | |
2284 | return true; | |
2285 | return false; | |
2286 | } | |
2b188cc1 | 2287 | |
c5b85625 JA |
2288 | /* any ->read/write should understand O_NONBLOCK */ |
2289 | if (file->f_flags & O_NONBLOCK) | |
2290 | return true; | |
2291 | ||
af197f50 JA |
2292 | if (!(file->f_mode & FMODE_NOWAIT)) |
2293 | return false; | |
2294 | ||
2295 | if (rw == READ) | |
2296 | return file->f_op->read_iter != NULL; | |
2297 | ||
2298 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2299 | } |
2300 | ||
3529d8c2 JA |
2301 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2302 | bool force_nonblock) | |
2b188cc1 | 2303 | { |
def596e9 | 2304 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2305 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2306 | unsigned ioprio; |
2307 | int ret; | |
2b188cc1 | 2308 | |
491381ce JA |
2309 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2310 | req->flags |= REQ_F_ISREG; | |
2311 | ||
2b188cc1 | 2312 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2313 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2314 | req->flags |= REQ_F_CUR_POS; | |
2315 | kiocb->ki_pos = req->file->f_pos; | |
2316 | } | |
2b188cc1 | 2317 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2318 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2319 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2320 | if (unlikely(ret)) | |
2321 | return ret; | |
2b188cc1 JA |
2322 | |
2323 | ioprio = READ_ONCE(sqe->ioprio); | |
2324 | if (ioprio) { | |
2325 | ret = ioprio_check_cap(ioprio); | |
2326 | if (ret) | |
09bb8394 | 2327 | return ret; |
2b188cc1 JA |
2328 | |
2329 | kiocb->ki_ioprio = ioprio; | |
2330 | } else | |
2331 | kiocb->ki_ioprio = get_current_ioprio(); | |
2332 | ||
8449eeda | 2333 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2334 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2335 | req->flags |= REQ_F_NOWAIT; |
2336 | ||
b63534c4 JA |
2337 | if (kiocb->ki_flags & IOCB_DIRECT) |
2338 | io_get_req_task(req); | |
2339 | ||
8449eeda | 2340 | if (force_nonblock) |
2b188cc1 | 2341 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2342 | |
def596e9 | 2343 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2344 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2345 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2346 | return -EOPNOTSUPP; |
2b188cc1 | 2347 | |
def596e9 JA |
2348 | kiocb->ki_flags |= IOCB_HIPRI; |
2349 | kiocb->ki_complete = io_complete_rw_iopoll; | |
6873e0bd | 2350 | req->result = 0; |
65a6543d | 2351 | req->iopoll_completed = 0; |
def596e9 | 2352 | } else { |
09bb8394 JA |
2353 | if (kiocb->ki_flags & IOCB_HIPRI) |
2354 | return -EINVAL; | |
def596e9 JA |
2355 | kiocb->ki_complete = io_complete_rw; |
2356 | } | |
9adbd45d | 2357 | |
3529d8c2 JA |
2358 | req->rw.addr = READ_ONCE(sqe->addr); |
2359 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2360 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2361 | return 0; |
2b188cc1 JA |
2362 | } |
2363 | ||
2364 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2365 | { | |
2366 | switch (ret) { | |
2367 | case -EIOCBQUEUED: | |
2368 | break; | |
2369 | case -ERESTARTSYS: | |
2370 | case -ERESTARTNOINTR: | |
2371 | case -ERESTARTNOHAND: | |
2372 | case -ERESTART_RESTARTBLOCK: | |
2373 | /* | |
2374 | * We can't just restart the syscall, since previously | |
2375 | * submitted sqes may already be in progress. Just fail this | |
2376 | * IO with EINTR. | |
2377 | */ | |
2378 | ret = -EINTR; | |
2379 | /* fall through */ | |
2380 | default: | |
2381 | kiocb->ki_complete(kiocb, ret, 0); | |
2382 | } | |
2383 | } | |
2384 | ||
014db007 | 2385 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret) |
ba816ad6 | 2386 | { |
ba04291e JA |
2387 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2388 | ||
2389 | if (req->flags & REQ_F_CUR_POS) | |
2390 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2391 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
014db007 | 2392 | io_complete_rw(kiocb, ret, 0); |
ba816ad6 JA |
2393 | else |
2394 | io_rw_done(kiocb, ret); | |
2395 | } | |
2396 | ||
9adbd45d | 2397 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2398 | struct iov_iter *iter) |
edafccee | 2399 | { |
9adbd45d JA |
2400 | struct io_ring_ctx *ctx = req->ctx; |
2401 | size_t len = req->rw.len; | |
edafccee | 2402 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2403 | u16 index, buf_index; |
edafccee JA |
2404 | size_t offset; |
2405 | u64 buf_addr; | |
2406 | ||
2407 | /* attempt to use fixed buffers without having provided iovecs */ | |
2408 | if (unlikely(!ctx->user_bufs)) | |
2409 | return -EFAULT; | |
2410 | ||
4f4eeba8 | 2411 | buf_index = req->buf_index; |
edafccee JA |
2412 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2413 | return -EFAULT; | |
2414 | ||
2415 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2416 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2417 | buf_addr = req->rw.addr; |
edafccee JA |
2418 | |
2419 | /* overflow */ | |
2420 | if (buf_addr + len < buf_addr) | |
2421 | return -EFAULT; | |
2422 | /* not inside the mapped region */ | |
2423 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2424 | return -EFAULT; | |
2425 | ||
2426 | /* | |
2427 | * May not be a start of buffer, set size appropriately | |
2428 | * and advance us to the beginning. | |
2429 | */ | |
2430 | offset = buf_addr - imu->ubuf; | |
2431 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2432 | |
2433 | if (offset) { | |
2434 | /* | |
2435 | * Don't use iov_iter_advance() here, as it's really slow for | |
2436 | * using the latter parts of a big fixed buffer - it iterates | |
2437 | * over each segment manually. We can cheat a bit here, because | |
2438 | * we know that: | |
2439 | * | |
2440 | * 1) it's a BVEC iter, we set it up | |
2441 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2442 | * first and last bvec | |
2443 | * | |
2444 | * So just find our index, and adjust the iterator afterwards. | |
2445 | * If the offset is within the first bvec (or the whole first | |
2446 | * bvec, just use iov_iter_advance(). This makes it easier | |
2447 | * since we can just skip the first segment, which may not | |
2448 | * be PAGE_SIZE aligned. | |
2449 | */ | |
2450 | const struct bio_vec *bvec = imu->bvec; | |
2451 | ||
2452 | if (offset <= bvec->bv_len) { | |
2453 | iov_iter_advance(iter, offset); | |
2454 | } else { | |
2455 | unsigned long seg_skip; | |
2456 | ||
2457 | /* skip first vec */ | |
2458 | offset -= bvec->bv_len; | |
2459 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2460 | ||
2461 | iter->bvec = bvec + seg_skip; | |
2462 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2463 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2464 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2465 | } |
2466 | } | |
2467 | ||
5e559561 | 2468 | return len; |
edafccee JA |
2469 | } |
2470 | ||
bcda7baa JA |
2471 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2472 | { | |
2473 | if (needs_lock) | |
2474 | mutex_unlock(&ctx->uring_lock); | |
2475 | } | |
2476 | ||
2477 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2478 | { | |
2479 | /* | |
2480 | * "Normal" inline submissions always hold the uring_lock, since we | |
2481 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2482 | * The only exception is when we've detached the request and issue it | |
2483 | * from an async worker thread, grab the lock for that case. | |
2484 | */ | |
2485 | if (needs_lock) | |
2486 | mutex_lock(&ctx->uring_lock); | |
2487 | } | |
2488 | ||
2489 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2490 | int bgid, struct io_buffer *kbuf, | |
2491 | bool needs_lock) | |
2492 | { | |
2493 | struct io_buffer *head; | |
2494 | ||
2495 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2496 | return kbuf; | |
2497 | ||
2498 | io_ring_submit_lock(req->ctx, needs_lock); | |
2499 | ||
2500 | lockdep_assert_held(&req->ctx->uring_lock); | |
2501 | ||
2502 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2503 | if (head) { | |
2504 | if (!list_empty(&head->list)) { | |
2505 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2506 | list); | |
2507 | list_del(&kbuf->list); | |
2508 | } else { | |
2509 | kbuf = head; | |
2510 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2511 | } | |
2512 | if (*len > kbuf->len) | |
2513 | *len = kbuf->len; | |
2514 | } else { | |
2515 | kbuf = ERR_PTR(-ENOBUFS); | |
2516 | } | |
2517 | ||
2518 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2519 | ||
2520 | return kbuf; | |
2521 | } | |
2522 | ||
4d954c25 JA |
2523 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2524 | bool needs_lock) | |
2525 | { | |
2526 | struct io_buffer *kbuf; | |
4f4eeba8 | 2527 | u16 bgid; |
4d954c25 JA |
2528 | |
2529 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2530 | bgid = req->buf_index; |
4d954c25 JA |
2531 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2532 | if (IS_ERR(kbuf)) | |
2533 | return kbuf; | |
2534 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2535 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2536 | return u64_to_user_ptr(kbuf->addr); | |
2537 | } | |
2538 | ||
2539 | #ifdef CONFIG_COMPAT | |
2540 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2541 | bool needs_lock) | |
2542 | { | |
2543 | struct compat_iovec __user *uiov; | |
2544 | compat_ssize_t clen; | |
2545 | void __user *buf; | |
2546 | ssize_t len; | |
2547 | ||
2548 | uiov = u64_to_user_ptr(req->rw.addr); | |
2549 | if (!access_ok(uiov, sizeof(*uiov))) | |
2550 | return -EFAULT; | |
2551 | if (__get_user(clen, &uiov->iov_len)) | |
2552 | return -EFAULT; | |
2553 | if (clen < 0) | |
2554 | return -EINVAL; | |
2555 | ||
2556 | len = clen; | |
2557 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2558 | if (IS_ERR(buf)) | |
2559 | return PTR_ERR(buf); | |
2560 | iov[0].iov_base = buf; | |
2561 | iov[0].iov_len = (compat_size_t) len; | |
2562 | return 0; | |
2563 | } | |
2564 | #endif | |
2565 | ||
2566 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2567 | bool needs_lock) | |
2568 | { | |
2569 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2570 | void __user *buf; | |
2571 | ssize_t len; | |
2572 | ||
2573 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2574 | return -EFAULT; | |
2575 | ||
2576 | len = iov[0].iov_len; | |
2577 | if (len < 0) | |
2578 | return -EINVAL; | |
2579 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2580 | if (IS_ERR(buf)) | |
2581 | return PTR_ERR(buf); | |
2582 | iov[0].iov_base = buf; | |
2583 | iov[0].iov_len = len; | |
2584 | return 0; | |
2585 | } | |
2586 | ||
2587 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2588 | bool needs_lock) | |
2589 | { | |
dddb3e26 JA |
2590 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2591 | struct io_buffer *kbuf; | |
2592 | ||
2593 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2594 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2595 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2596 | return 0; |
dddb3e26 | 2597 | } |
4d954c25 JA |
2598 | if (!req->rw.len) |
2599 | return 0; | |
2600 | else if (req->rw.len > 1) | |
2601 | return -EINVAL; | |
2602 | ||
2603 | #ifdef CONFIG_COMPAT | |
2604 | if (req->ctx->compat) | |
2605 | return io_compat_import(req, iov, needs_lock); | |
2606 | #endif | |
2607 | ||
2608 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2609 | } | |
2610 | ||
cf6fd4bd | 2611 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2612 | struct iovec **iovec, struct iov_iter *iter, |
2613 | bool needs_lock) | |
2b188cc1 | 2614 | { |
9adbd45d JA |
2615 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2616 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2617 | ssize_t ret; |
edafccee JA |
2618 | u8 opcode; |
2619 | ||
d625c6ee | 2620 | opcode = req->opcode; |
7d009165 | 2621 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2622 | *iovec = NULL; |
9adbd45d | 2623 | return io_import_fixed(req, rw, iter); |
edafccee | 2624 | } |
2b188cc1 | 2625 | |
bcda7baa | 2626 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2627 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2628 | return -EINVAL; |
2629 | ||
3a6820f2 | 2630 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2631 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2632 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2633 | if (IS_ERR(buf)) { | |
bcda7baa | 2634 | *iovec = NULL; |
4d954c25 | 2635 | return PTR_ERR(buf); |
bcda7baa | 2636 | } |
3f9d6441 | 2637 | req->rw.len = sqe_len; |
bcda7baa JA |
2638 | } |
2639 | ||
3a6820f2 JA |
2640 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2641 | *iovec = NULL; | |
3a901598 | 2642 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2643 | } |
2644 | ||
f67676d1 JA |
2645 | if (req->io) { |
2646 | struct io_async_rw *iorw = &req->io->rw; | |
2647 | ||
2648 | *iovec = iorw->iov; | |
2649 | iov_iter_init(iter, rw, *iovec, iorw->nr_segs, iorw->size); | |
2650 | if (iorw->iov == iorw->fast_iov) | |
2651 | *iovec = NULL; | |
2652 | return iorw->size; | |
2653 | } | |
2654 | ||
4d954c25 JA |
2655 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2656 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2657 | if (!ret) { |
2658 | ret = (*iovec)->iov_len; | |
2659 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2660 | } | |
4d954c25 JA |
2661 | *iovec = NULL; |
2662 | return ret; | |
2663 | } | |
2664 | ||
2b188cc1 | 2665 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2666 | if (req->ctx->compat) |
2b188cc1 JA |
2667 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2668 | iovec, iter); | |
2669 | #endif | |
2670 | ||
2671 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2672 | } | |
2673 | ||
31b51510 | 2674 | /* |
32960613 JA |
2675 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2676 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2677 | */ |
32960613 JA |
2678 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2679 | struct iov_iter *iter) | |
2680 | { | |
2681 | ssize_t ret = 0; | |
2682 | ||
2683 | /* | |
2684 | * Don't support polled IO through this interface, and we can't | |
2685 | * support non-blocking either. For the latter, this just causes | |
2686 | * the kiocb to be handled from an async context. | |
2687 | */ | |
2688 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2689 | return -EOPNOTSUPP; | |
2690 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2691 | return -EAGAIN; | |
2692 | ||
2693 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2694 | struct iovec iovec; |
32960613 JA |
2695 | ssize_t nr; |
2696 | ||
311ae9e1 PB |
2697 | if (!iov_iter_is_bvec(iter)) { |
2698 | iovec = iov_iter_iovec(iter); | |
2699 | } else { | |
2700 | /* fixed buffers import bvec */ | |
2701 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2702 | + iter->iov_offset; | |
2703 | iovec.iov_len = min(iter->count, | |
2704 | iter->bvec->bv_len - iter->iov_offset); | |
2705 | } | |
2706 | ||
32960613 JA |
2707 | if (rw == READ) { |
2708 | nr = file->f_op->read(file, iovec.iov_base, | |
2709 | iovec.iov_len, &kiocb->ki_pos); | |
2710 | } else { | |
2711 | nr = file->f_op->write(file, iovec.iov_base, | |
2712 | iovec.iov_len, &kiocb->ki_pos); | |
2713 | } | |
2714 | ||
311ae9e1 PB |
2715 | if (iov_iter_is_bvec(iter)) |
2716 | kunmap(iter->bvec->bv_page); | |
2717 | ||
32960613 JA |
2718 | if (nr < 0) { |
2719 | if (!ret) | |
2720 | ret = nr; | |
2721 | break; | |
2722 | } | |
2723 | ret += nr; | |
2724 | if (nr != iovec.iov_len) | |
2725 | break; | |
2726 | iov_iter_advance(iter, nr); | |
2727 | } | |
2728 | ||
2729 | return ret; | |
2730 | } | |
2731 | ||
b7bb4f7d | 2732 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2733 | struct iovec *iovec, struct iovec *fast_iov, |
2734 | struct iov_iter *iter) | |
2735 | { | |
2736 | req->io->rw.nr_segs = iter->nr_segs; | |
2737 | req->io->rw.size = io_size; | |
2738 | req->io->rw.iov = iovec; | |
2739 | if (!req->io->rw.iov) { | |
2740 | req->io->rw.iov = req->io->rw.fast_iov; | |
45097dae XW |
2741 | if (req->io->rw.iov != fast_iov) |
2742 | memcpy(req->io->rw.iov, fast_iov, | |
2743 | sizeof(struct iovec) * iter->nr_segs); | |
99bc4c38 PB |
2744 | } else { |
2745 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
2746 | } |
2747 | } | |
2748 | ||
3d9932a8 XW |
2749 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2750 | { | |
2751 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2752 | return req->io == NULL; | |
2753 | } | |
2754 | ||
b7bb4f7d | 2755 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2756 | { |
d3656344 JA |
2757 | if (!io_op_defs[req->opcode].async_ctx) |
2758 | return 0; | |
3d9932a8 XW |
2759 | |
2760 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2761 | } |
2762 | ||
b7bb4f7d JA |
2763 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2764 | struct iovec *iovec, struct iovec *fast_iov, | |
2765 | struct iov_iter *iter) | |
2766 | { | |
980ad263 | 2767 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2768 | return 0; |
5d204bcf | 2769 | if (!req->io) { |
3d9932a8 | 2770 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2771 | return -ENOMEM; |
b7bb4f7d | 2772 | |
5d204bcf JA |
2773 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2774 | } | |
b7bb4f7d | 2775 | return 0; |
f67676d1 JA |
2776 | } |
2777 | ||
3529d8c2 JA |
2778 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2779 | bool force_nonblock) | |
f67676d1 | 2780 | { |
3529d8c2 JA |
2781 | struct io_async_ctx *io; |
2782 | struct iov_iter iter; | |
f67676d1 JA |
2783 | ssize_t ret; |
2784 | ||
3529d8c2 JA |
2785 | ret = io_prep_rw(req, sqe, force_nonblock); |
2786 | if (ret) | |
2787 | return ret; | |
f67676d1 | 2788 | |
3529d8c2 JA |
2789 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2790 | return -EBADF; | |
f67676d1 | 2791 | |
5f798bea PB |
2792 | /* either don't need iovec imported or already have it */ |
2793 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2794 | return 0; |
2795 | ||
2796 | io = req->io; | |
2797 | io->rw.iov = io->rw.fast_iov; | |
2798 | req->io = NULL; | |
bcda7baa | 2799 | ret = io_import_iovec(READ, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2800 | req->io = io; |
2801 | if (ret < 0) | |
2802 | return ret; | |
2803 | ||
2804 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2805 | return 0; | |
f67676d1 JA |
2806 | } |
2807 | ||
bcf5a063 JA |
2808 | static void __io_async_buf_error(struct io_kiocb *req, int error) |
2809 | { | |
2810 | struct io_ring_ctx *ctx = req->ctx; | |
2811 | ||
2812 | spin_lock_irq(&ctx->completion_lock); | |
2813 | io_cqring_fill_event(req, error); | |
2814 | io_commit_cqring(ctx); | |
2815 | spin_unlock_irq(&ctx->completion_lock); | |
2816 | ||
2817 | io_cqring_ev_posted(ctx); | |
2818 | req_set_fail_links(req); | |
2819 | io_double_put_req(req); | |
2820 | } | |
2821 | ||
2822 | static void io_async_buf_cancel(struct callback_head *cb) | |
2823 | { | |
2824 | struct io_async_rw *rw; | |
2825 | struct io_kiocb *req; | |
2826 | ||
2827 | rw = container_of(cb, struct io_async_rw, task_work); | |
2828 | req = rw->wpq.wait.private; | |
2829 | __io_async_buf_error(req, -ECANCELED); | |
2830 | } | |
2831 | ||
2832 | static void io_async_buf_retry(struct callback_head *cb) | |
2833 | { | |
2834 | struct io_async_rw *rw; | |
2835 | struct io_ring_ctx *ctx; | |
2836 | struct io_kiocb *req; | |
2837 | ||
2838 | rw = container_of(cb, struct io_async_rw, task_work); | |
2839 | req = rw->wpq.wait.private; | |
2840 | ctx = req->ctx; | |
2841 | ||
2842 | __set_current_state(TASK_RUNNING); | |
d3cac64c | 2843 | if (!__io_sq_thread_acquire_mm(ctx)) { |
bcf5a063 | 2844 | mutex_lock(&ctx->uring_lock); |
f13fad7b | 2845 | __io_queue_sqe(req, NULL, NULL); |
bcf5a063 JA |
2846 | mutex_unlock(&ctx->uring_lock); |
2847 | } else { | |
2848 | __io_async_buf_error(req, -EFAULT); | |
2849 | } | |
2850 | } | |
2851 | ||
2852 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, | |
2853 | int sync, void *arg) | |
2854 | { | |
2855 | struct wait_page_queue *wpq; | |
2856 | struct io_kiocb *req = wait->private; | |
2857 | struct io_async_rw *rw = &req->io->rw; | |
2858 | struct wait_page_key *key = arg; | |
2859 | struct task_struct *tsk; | |
2860 | int ret; | |
2861 | ||
2862 | wpq = container_of(wait, struct wait_page_queue, wait); | |
2863 | ||
2864 | ret = wake_page_match(wpq, key); | |
2865 | if (ret != 1) | |
2866 | return ret; | |
2867 | ||
2868 | list_del_init(&wait->entry); | |
2869 | ||
2870 | init_task_work(&rw->task_work, io_async_buf_retry); | |
2871 | /* submit ref gets dropped, acquire a new one */ | |
2872 | refcount_inc(&req->refs); | |
2873 | tsk = req->task; | |
2874 | ret = task_work_add(tsk, &rw->task_work, true); | |
2875 | if (unlikely(ret)) { | |
2876 | /* queue just for cancelation */ | |
2877 | init_task_work(&rw->task_work, io_async_buf_cancel); | |
2878 | tsk = io_wq_get_task(req->ctx->io_wq); | |
2879 | task_work_add(tsk, &rw->task_work, true); | |
2880 | } | |
2881 | wake_up_process(tsk); | |
2882 | return 1; | |
2883 | } | |
2884 | ||
2885 | static bool io_rw_should_retry(struct io_kiocb *req) | |
2886 | { | |
2887 | struct kiocb *kiocb = &req->rw.kiocb; | |
2888 | int ret; | |
2889 | ||
2890 | /* never retry for NOWAIT, we just complete with -EAGAIN */ | |
2891 | if (req->flags & REQ_F_NOWAIT) | |
2892 | return false; | |
2893 | ||
2894 | /* already tried, or we're doing O_DIRECT */ | |
2895 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_WAITQ)) | |
2896 | return false; | |
2897 | /* | |
2898 | * just use poll if we can, and don't attempt if the fs doesn't | |
2899 | * support callback based unlocks | |
2900 | */ | |
2901 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
2902 | return false; | |
2903 | ||
2904 | /* | |
2905 | * If request type doesn't require req->io to defer in general, | |
2906 | * we need to allocate it here | |
2907 | */ | |
2908 | if (!req->io && __io_alloc_async_ctx(req)) | |
2909 | return false; | |
2910 | ||
2911 | ret = kiocb_wait_page_queue_init(kiocb, &req->io->rw.wpq, | |
2912 | io_async_buf_func, req); | |
2913 | if (!ret) { | |
2914 | io_get_req_task(req); | |
2915 | return true; | |
2916 | } | |
2917 | ||
2918 | return false; | |
2919 | } | |
2920 | ||
2921 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
2922 | { | |
2923 | if (req->file->f_op->read_iter) | |
2924 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2925 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
2926 | } | |
2927 | ||
014db007 | 2928 | static int io_read(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2929 | { |
2930 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2931 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2932 | struct iov_iter iter; |
31b51510 | 2933 | size_t iov_count; |
f67676d1 | 2934 | ssize_t io_size, ret; |
2b188cc1 | 2935 | |
bcda7baa | 2936 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2937 | if (ret < 0) |
2938 | return ret; | |
2b188cc1 | 2939 | |
fd6c2e4c JA |
2940 | /* Ensure we clear previously set non-block flag */ |
2941 | if (!force_nonblock) | |
29de5f6a | 2942 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2943 | |
797f3f53 | 2944 | req->result = 0; |
f67676d1 | 2945 | io_size = ret; |
dea3b49c | 2946 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 JA |
2947 | req->result = io_size; |
2948 | ||
24c74678 | 2949 | /* If the file doesn't support async, just async punt */ |
af197f50 | 2950 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 2951 | goto copy_iov; |
9e645e11 | 2952 | |
31b51510 | 2953 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2954 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 2955 | if (!ret) { |
b63534c4 | 2956 | unsigned long nr_segs = iter.nr_segs; |
4503b767 | 2957 | ssize_t ret2 = 0; |
2b188cc1 | 2958 | |
bcf5a063 | 2959 | ret2 = io_iter_do_read(req, &iter); |
32960613 | 2960 | |
9d93a3f5 | 2961 | /* Catch -EAGAIN return for forced non-blocking submission */ |
4503b767 | 2962 | if (!force_nonblock || (ret2 != -EAGAIN && ret2 != -EIO)) { |
014db007 | 2963 | kiocb_done(kiocb, ret2); |
f67676d1 | 2964 | } else { |
b63534c4 JA |
2965 | iter.count = iov_count; |
2966 | iter.nr_segs = nr_segs; | |
f67676d1 | 2967 | copy_iov: |
b7bb4f7d | 2968 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2969 | inline_vecs, &iter); |
2970 | if (ret) | |
2971 | goto out_free; | |
bcf5a063 JA |
2972 | /* if we can retry, do so with the callbacks armed */ |
2973 | if (io_rw_should_retry(req)) { | |
2974 | ret2 = io_iter_do_read(req, &iter); | |
2975 | if (ret2 == -EIOCBQUEUED) { | |
2976 | goto out_free; | |
2977 | } else if (ret2 != -EAGAIN) { | |
2978 | kiocb_done(kiocb, ret2); | |
2979 | goto out_free; | |
2980 | } | |
2981 | } | |
2982 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
f67676d1 JA |
2983 | return -EAGAIN; |
2984 | } | |
2b188cc1 | 2985 | } |
f67676d1 | 2986 | out_free: |
6f2cc166 XW |
2987 | if (!(req->flags & REQ_F_NEED_CLEANUP)) |
2988 | kfree(iovec); | |
2b188cc1 JA |
2989 | return ret; |
2990 | } | |
2991 | ||
3529d8c2 JA |
2992 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2993 | bool force_nonblock) | |
f67676d1 | 2994 | { |
3529d8c2 JA |
2995 | struct io_async_ctx *io; |
2996 | struct iov_iter iter; | |
f67676d1 JA |
2997 | ssize_t ret; |
2998 | ||
3529d8c2 JA |
2999 | ret = io_prep_rw(req, sqe, force_nonblock); |
3000 | if (ret) | |
3001 | return ret; | |
f67676d1 | 3002 | |
3529d8c2 JA |
3003 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3004 | return -EBADF; | |
f67676d1 | 3005 | |
4ed734b0 JA |
3006 | req->fsize = rlimit(RLIMIT_FSIZE); |
3007 | ||
5f798bea PB |
3008 | /* either don't need iovec imported or already have it */ |
3009 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
3010 | return 0; |
3011 | ||
3012 | io = req->io; | |
3013 | io->rw.iov = io->rw.fast_iov; | |
3014 | req->io = NULL; | |
bcda7baa | 3015 | ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
3016 | req->io = io; |
3017 | if (ret < 0) | |
3018 | return ret; | |
3019 | ||
3020 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
3021 | return 0; | |
f67676d1 JA |
3022 | } |
3023 | ||
014db007 | 3024 | static int io_write(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
3025 | { |
3026 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3027 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3028 | struct iov_iter iter; |
31b51510 | 3029 | size_t iov_count; |
f67676d1 | 3030 | ssize_t ret, io_size; |
2b188cc1 | 3031 | |
bcda7baa | 3032 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3033 | if (ret < 0) |
3034 | return ret; | |
2b188cc1 | 3035 | |
fd6c2e4c JA |
3036 | /* Ensure we clear previously set non-block flag */ |
3037 | if (!force_nonblock) | |
9adbd45d | 3038 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3039 | |
797f3f53 | 3040 | req->result = 0; |
f67676d1 | 3041 | io_size = ret; |
dea3b49c | 3042 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 | 3043 | req->result = io_size; |
9e645e11 | 3044 | |
24c74678 | 3045 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3046 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3047 | goto copy_iov; |
31b51510 | 3048 | |
10d59345 JA |
3049 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3050 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3051 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3052 | goto copy_iov; |
31b51510 | 3053 | |
f67676d1 | 3054 | iov_count = iov_iter_count(&iter); |
9adbd45d | 3055 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 3056 | if (!ret) { |
b63534c4 | 3057 | unsigned long nr_segs = iter.nr_segs; |
9bf7933f RP |
3058 | ssize_t ret2; |
3059 | ||
2b188cc1 JA |
3060 | /* |
3061 | * Open-code file_start_write here to grab freeze protection, | |
3062 | * which will be released by another thread in | |
3063 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3064 | * released so that it doesn't complain about the held lock when | |
3065 | * we return to userspace. | |
3066 | */ | |
491381ce | 3067 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 3068 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 3069 | SB_FREEZE_WRITE, true); |
9adbd45d | 3070 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
3071 | SB_FREEZE_WRITE); |
3072 | } | |
3073 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 3074 | |
4ed734b0 JA |
3075 | if (!force_nonblock) |
3076 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; | |
3077 | ||
9adbd45d JA |
3078 | if (req->file->f_op->write_iter) |
3079 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 3080 | else |
9adbd45d | 3081 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 JA |
3082 | |
3083 | if (!force_nonblock) | |
3084 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
3085 | ||
faac996c | 3086 | /* |
bff6035d | 3087 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
3088 | * retry them without IOCB_NOWAIT. |
3089 | */ | |
3090 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3091 | ret2 = -EAGAIN; | |
f67676d1 | 3092 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 3093 | kiocb_done(kiocb, ret2); |
f67676d1 | 3094 | } else { |
b63534c4 JA |
3095 | iter.count = iov_count; |
3096 | iter.nr_segs = nr_segs; | |
f67676d1 | 3097 | copy_iov: |
b7bb4f7d | 3098 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
3099 | inline_vecs, &iter); |
3100 | if (ret) | |
3101 | goto out_free; | |
3102 | return -EAGAIN; | |
3103 | } | |
2b188cc1 | 3104 | } |
31b51510 | 3105 | out_free: |
6f2cc166 XW |
3106 | if (!(req->flags & REQ_F_NEED_CLEANUP)) |
3107 | kfree(iovec); | |
2b188cc1 JA |
3108 | return ret; |
3109 | } | |
3110 | ||
f2a8d5c7 PB |
3111 | static int __io_splice_prep(struct io_kiocb *req, |
3112 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3113 | { |
3114 | struct io_splice* sp = &req->splice; | |
3115 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3116 | int ret; | |
3117 | ||
3118 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3119 | return 0; | |
3232dd02 PB |
3120 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3121 | return -EINVAL; | |
7d67af2c PB |
3122 | |
3123 | sp->file_in = NULL; | |
7d67af2c PB |
3124 | sp->len = READ_ONCE(sqe->len); |
3125 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3126 | ||
3127 | if (unlikely(sp->flags & ~valid_flags)) | |
3128 | return -EINVAL; | |
3129 | ||
3130 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3131 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3132 | if (ret) | |
3133 | return ret; | |
3134 | req->flags |= REQ_F_NEED_CLEANUP; | |
3135 | ||
7cdaf587 XW |
3136 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3137 | /* | |
3138 | * Splice operation will be punted aync, and here need to | |
3139 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3140 | */ | |
3141 | io_req_init_async(req); | |
7d67af2c | 3142 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3143 | } |
7d67af2c PB |
3144 | |
3145 | return 0; | |
3146 | } | |
3147 | ||
f2a8d5c7 PB |
3148 | static int io_tee_prep(struct io_kiocb *req, |
3149 | const struct io_uring_sqe *sqe) | |
3150 | { | |
3151 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3152 | return -EINVAL; | |
3153 | return __io_splice_prep(req, sqe); | |
3154 | } | |
3155 | ||
3156 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3157 | { | |
3158 | struct io_splice *sp = &req->splice; | |
3159 | struct file *in = sp->file_in; | |
3160 | struct file *out = sp->file_out; | |
3161 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3162 | long ret = 0; | |
3163 | ||
3164 | if (force_nonblock) | |
3165 | return -EAGAIN; | |
3166 | if (sp->len) | |
3167 | ret = do_tee(in, out, sp->len, flags); | |
3168 | ||
3169 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3170 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3171 | ||
f2a8d5c7 PB |
3172 | if (ret != sp->len) |
3173 | req_set_fail_links(req); | |
e1e16097 | 3174 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3175 | return 0; |
3176 | } | |
3177 | ||
3178 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3179 | { | |
3180 | struct io_splice* sp = &req->splice; | |
3181 | ||
3182 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3183 | sp->off_out = READ_ONCE(sqe->off); | |
3184 | return __io_splice_prep(req, sqe); | |
3185 | } | |
3186 | ||
014db007 | 3187 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3188 | { |
3189 | struct io_splice *sp = &req->splice; | |
3190 | struct file *in = sp->file_in; | |
3191 | struct file *out = sp->file_out; | |
3192 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3193 | loff_t *poff_in, *poff_out; | |
c9687426 | 3194 | long ret = 0; |
7d67af2c | 3195 | |
2fb3e822 PB |
3196 | if (force_nonblock) |
3197 | return -EAGAIN; | |
7d67af2c PB |
3198 | |
3199 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3200 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3201 | |
948a7749 | 3202 | if (sp->len) |
c9687426 | 3203 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3204 | |
3205 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3206 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3207 | ||
7d67af2c PB |
3208 | if (ret != sp->len) |
3209 | req_set_fail_links(req); | |
e1e16097 | 3210 | io_req_complete(req, ret); |
7d67af2c PB |
3211 | return 0; |
3212 | } | |
3213 | ||
2b188cc1 JA |
3214 | /* |
3215 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3216 | */ | |
229a7b63 | 3217 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3218 | { |
3219 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3220 | |
def596e9 JA |
3221 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3222 | return -EINVAL; | |
3223 | ||
229a7b63 | 3224 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3225 | return 0; |
3226 | } | |
3227 | ||
3529d8c2 | 3228 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3229 | { |
6b06314c | 3230 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3231 | |
09bb8394 JA |
3232 | if (!req->file) |
3233 | return -EBADF; | |
c992fe29 | 3234 | |
6b06314c | 3235 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3236 | return -EINVAL; |
edafccee | 3237 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3238 | return -EINVAL; |
3239 | ||
8ed8d3c3 JA |
3240 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3241 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3242 | return -EINVAL; | |
3243 | ||
3244 | req->sync.off = READ_ONCE(sqe->off); | |
3245 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3246 | return 0; |
3247 | } | |
3248 | ||
ac45abc0 | 3249 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3250 | { |
8ed8d3c3 | 3251 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3252 | int ret; |
3253 | ||
ac45abc0 PB |
3254 | /* fsync always requires a blocking context */ |
3255 | if (force_nonblock) | |
3256 | return -EAGAIN; | |
3257 | ||
9adbd45d | 3258 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3259 | end > 0 ? end : LLONG_MAX, |
3260 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3261 | if (ret < 0) | |
3262 | req_set_fail_links(req); | |
e1e16097 | 3263 | io_req_complete(req, ret); |
c992fe29 CH |
3264 | return 0; |
3265 | } | |
3266 | ||
d63d1b5e JA |
3267 | static int io_fallocate_prep(struct io_kiocb *req, |
3268 | const struct io_uring_sqe *sqe) | |
3269 | { | |
3270 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3271 | return -EINVAL; | |
3232dd02 PB |
3272 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3273 | return -EINVAL; | |
d63d1b5e JA |
3274 | |
3275 | req->sync.off = READ_ONCE(sqe->off); | |
3276 | req->sync.len = READ_ONCE(sqe->addr); | |
3277 | req->sync.mode = READ_ONCE(sqe->len); | |
4ed734b0 | 3278 | req->fsize = rlimit(RLIMIT_FSIZE); |
d63d1b5e JA |
3279 | return 0; |
3280 | } | |
3281 | ||
014db007 | 3282 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3283 | { |
ac45abc0 PB |
3284 | int ret; |
3285 | ||
d63d1b5e | 3286 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3287 | if (force_nonblock) |
5d17b4a4 JA |
3288 | return -EAGAIN; |
3289 | ||
ac45abc0 PB |
3290 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; |
3291 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, | |
3292 | req->sync.len); | |
3293 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
3294 | if (ret < 0) | |
3295 | req_set_fail_links(req); | |
e1e16097 | 3296 | io_req_complete(req, ret); |
5d17b4a4 JA |
3297 | return 0; |
3298 | } | |
3299 | ||
ec65fea5 | 3300 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3301 | { |
f8748881 | 3302 | const char __user *fname; |
15b71abe | 3303 | int ret; |
b7bb4f7d | 3304 | |
3232dd02 | 3305 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3306 | return -EINVAL; |
ec65fea5 | 3307 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3308 | return -EINVAL; |
ec65fea5 | 3309 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3310 | return -EBADF; |
03b1230c | 3311 | |
ec65fea5 PB |
3312 | /* open.how should be already initialised */ |
3313 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3314 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3315 | |
25e72d10 PB |
3316 | req->open.dfd = READ_ONCE(sqe->fd); |
3317 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3318 | req->open.filename = getname(fname); |
15b71abe JA |
3319 | if (IS_ERR(req->open.filename)) { |
3320 | ret = PTR_ERR(req->open.filename); | |
3321 | req->open.filename = NULL; | |
3322 | return ret; | |
3323 | } | |
4022e7af | 3324 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3325 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3326 | return 0; |
03b1230c JA |
3327 | } |
3328 | ||
ec65fea5 PB |
3329 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3330 | { | |
3331 | u64 flags, mode; | |
3332 | ||
3333 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3334 | return 0; | |
3335 | mode = READ_ONCE(sqe->len); | |
3336 | flags = READ_ONCE(sqe->open_flags); | |
3337 | req->open.how = build_open_how(flags, mode); | |
3338 | return __io_openat_prep(req, sqe); | |
3339 | } | |
3340 | ||
cebdb986 | 3341 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3342 | { |
cebdb986 | 3343 | struct open_how __user *how; |
cebdb986 | 3344 | size_t len; |
0fa03c62 JA |
3345 | int ret; |
3346 | ||
0bdbdd08 PB |
3347 | if (req->flags & REQ_F_NEED_CLEANUP) |
3348 | return 0; | |
cebdb986 JA |
3349 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3350 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3351 | if (len < OPEN_HOW_SIZE_VER0) |
3352 | return -EINVAL; | |
3529d8c2 | 3353 | |
cebdb986 JA |
3354 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3355 | len); | |
3356 | if (ret) | |
3357 | return ret; | |
3529d8c2 | 3358 | |
ec65fea5 | 3359 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3360 | } |
3361 | ||
014db007 | 3362 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3363 | { |
3364 | struct open_flags op; | |
15b71abe JA |
3365 | struct file *file; |
3366 | int ret; | |
3367 | ||
f86cd20c | 3368 | if (force_nonblock) |
15b71abe | 3369 | return -EAGAIN; |
15b71abe | 3370 | |
cebdb986 | 3371 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3372 | if (ret) |
3373 | goto err; | |
3374 | ||
4022e7af | 3375 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3376 | if (ret < 0) |
3377 | goto err; | |
3378 | ||
3379 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3380 | if (IS_ERR(file)) { | |
3381 | put_unused_fd(ret); | |
3382 | ret = PTR_ERR(file); | |
3383 | } else { | |
3384 | fsnotify_open(file); | |
3385 | fd_install(ret, file); | |
3386 | } | |
3387 | err: | |
3388 | putname(req->open.filename); | |
8fef80bf | 3389 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3390 | if (ret < 0) |
3391 | req_set_fail_links(req); | |
e1e16097 | 3392 | io_req_complete(req, ret); |
15b71abe JA |
3393 | return 0; |
3394 | } | |
3395 | ||
014db007 | 3396 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3397 | { |
014db007 | 3398 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3399 | } |
3400 | ||
067524e9 JA |
3401 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3402 | const struct io_uring_sqe *sqe) | |
3403 | { | |
3404 | struct io_provide_buf *p = &req->pbuf; | |
3405 | u64 tmp; | |
3406 | ||
3407 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3408 | return -EINVAL; | |
3409 | ||
3410 | tmp = READ_ONCE(sqe->fd); | |
3411 | if (!tmp || tmp > USHRT_MAX) | |
3412 | return -EINVAL; | |
3413 | ||
3414 | memset(p, 0, sizeof(*p)); | |
3415 | p->nbufs = tmp; | |
3416 | p->bgid = READ_ONCE(sqe->buf_group); | |
3417 | return 0; | |
3418 | } | |
3419 | ||
3420 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3421 | int bgid, unsigned nbufs) | |
3422 | { | |
3423 | unsigned i = 0; | |
3424 | ||
3425 | /* shouldn't happen */ | |
3426 | if (!nbufs) | |
3427 | return 0; | |
3428 | ||
3429 | /* the head kbuf is the list itself */ | |
3430 | while (!list_empty(&buf->list)) { | |
3431 | struct io_buffer *nxt; | |
3432 | ||
3433 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3434 | list_del(&nxt->list); | |
3435 | kfree(nxt); | |
3436 | if (++i == nbufs) | |
3437 | return i; | |
3438 | } | |
3439 | i++; | |
3440 | kfree(buf); | |
3441 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3442 | ||
3443 | return i; | |
3444 | } | |
3445 | ||
229a7b63 JA |
3446 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3447 | struct io_comp_state *cs) | |
067524e9 JA |
3448 | { |
3449 | struct io_provide_buf *p = &req->pbuf; | |
3450 | struct io_ring_ctx *ctx = req->ctx; | |
3451 | struct io_buffer *head; | |
3452 | int ret = 0; | |
3453 | ||
3454 | io_ring_submit_lock(ctx, !force_nonblock); | |
3455 | ||
3456 | lockdep_assert_held(&ctx->uring_lock); | |
3457 | ||
3458 | ret = -ENOENT; | |
3459 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3460 | if (head) | |
3461 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3462 | ||
3463 | io_ring_submit_lock(ctx, !force_nonblock); | |
3464 | if (ret < 0) | |
3465 | req_set_fail_links(req); | |
229a7b63 | 3466 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3467 | return 0; |
3468 | } | |
3469 | ||
ddf0322d JA |
3470 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3471 | const struct io_uring_sqe *sqe) | |
3472 | { | |
3473 | struct io_provide_buf *p = &req->pbuf; | |
3474 | u64 tmp; | |
3475 | ||
3476 | if (sqe->ioprio || sqe->rw_flags) | |
3477 | return -EINVAL; | |
3478 | ||
3479 | tmp = READ_ONCE(sqe->fd); | |
3480 | if (!tmp || tmp > USHRT_MAX) | |
3481 | return -E2BIG; | |
3482 | p->nbufs = tmp; | |
3483 | p->addr = READ_ONCE(sqe->addr); | |
3484 | p->len = READ_ONCE(sqe->len); | |
3485 | ||
efe68c1c | 3486 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3487 | return -EFAULT; |
3488 | ||
3489 | p->bgid = READ_ONCE(sqe->buf_group); | |
3490 | tmp = READ_ONCE(sqe->off); | |
3491 | if (tmp > USHRT_MAX) | |
3492 | return -E2BIG; | |
3493 | p->bid = tmp; | |
3494 | return 0; | |
3495 | } | |
3496 | ||
3497 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3498 | { | |
3499 | struct io_buffer *buf; | |
3500 | u64 addr = pbuf->addr; | |
3501 | int i, bid = pbuf->bid; | |
3502 | ||
3503 | for (i = 0; i < pbuf->nbufs; i++) { | |
3504 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3505 | if (!buf) | |
3506 | break; | |
3507 | ||
3508 | buf->addr = addr; | |
3509 | buf->len = pbuf->len; | |
3510 | buf->bid = bid; | |
3511 | addr += pbuf->len; | |
3512 | bid++; | |
3513 | if (!*head) { | |
3514 | INIT_LIST_HEAD(&buf->list); | |
3515 | *head = buf; | |
3516 | } else { | |
3517 | list_add_tail(&buf->list, &(*head)->list); | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | return i ? i : -ENOMEM; | |
3522 | } | |
3523 | ||
229a7b63 JA |
3524 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3525 | struct io_comp_state *cs) | |
ddf0322d JA |
3526 | { |
3527 | struct io_provide_buf *p = &req->pbuf; | |
3528 | struct io_ring_ctx *ctx = req->ctx; | |
3529 | struct io_buffer *head, *list; | |
3530 | int ret = 0; | |
3531 | ||
3532 | io_ring_submit_lock(ctx, !force_nonblock); | |
3533 | ||
3534 | lockdep_assert_held(&ctx->uring_lock); | |
3535 | ||
3536 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3537 | ||
3538 | ret = io_add_buffers(p, &head); | |
3539 | if (ret < 0) | |
3540 | goto out; | |
3541 | ||
3542 | if (!list) { | |
3543 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3544 | GFP_KERNEL); | |
3545 | if (ret < 0) { | |
067524e9 | 3546 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3547 | goto out; |
3548 | } | |
3549 | } | |
3550 | out: | |
3551 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3552 | if (ret < 0) | |
3553 | req_set_fail_links(req); | |
229a7b63 | 3554 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3555 | return 0; |
cebdb986 JA |
3556 | } |
3557 | ||
3e4827b0 JA |
3558 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3559 | const struct io_uring_sqe *sqe) | |
3560 | { | |
3561 | #if defined(CONFIG_EPOLL) | |
3562 | if (sqe->ioprio || sqe->buf_index) | |
3563 | return -EINVAL; | |
3232dd02 PB |
3564 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3565 | return -EINVAL; | |
3e4827b0 JA |
3566 | |
3567 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3568 | req->epoll.op = READ_ONCE(sqe->len); | |
3569 | req->epoll.fd = READ_ONCE(sqe->off); | |
3570 | ||
3571 | if (ep_op_has_event(req->epoll.op)) { | |
3572 | struct epoll_event __user *ev; | |
3573 | ||
3574 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3575 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3576 | return -EFAULT; | |
3577 | } | |
3578 | ||
3579 | return 0; | |
3580 | #else | |
3581 | return -EOPNOTSUPP; | |
3582 | #endif | |
3583 | } | |
3584 | ||
229a7b63 JA |
3585 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3586 | struct io_comp_state *cs) | |
3e4827b0 JA |
3587 | { |
3588 | #if defined(CONFIG_EPOLL) | |
3589 | struct io_epoll *ie = &req->epoll; | |
3590 | int ret; | |
3591 | ||
3592 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3593 | if (force_nonblock && ret == -EAGAIN) | |
3594 | return -EAGAIN; | |
3595 | ||
3596 | if (ret < 0) | |
3597 | req_set_fail_links(req); | |
229a7b63 | 3598 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3599 | return 0; |
3600 | #else | |
3601 | return -EOPNOTSUPP; | |
3602 | #endif | |
3603 | } | |
3604 | ||
c1ca757b JA |
3605 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3606 | { | |
3607 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3608 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3609 | return -EINVAL; | |
3232dd02 PB |
3610 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3611 | return -EINVAL; | |
c1ca757b JA |
3612 | |
3613 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3614 | req->madvise.len = READ_ONCE(sqe->len); | |
3615 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3616 | return 0; | |
3617 | #else | |
3618 | return -EOPNOTSUPP; | |
3619 | #endif | |
3620 | } | |
3621 | ||
014db007 | 3622 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3623 | { |
3624 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3625 | struct io_madvise *ma = &req->madvise; | |
3626 | int ret; | |
3627 | ||
3628 | if (force_nonblock) | |
3629 | return -EAGAIN; | |
3630 | ||
3631 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3632 | if (ret < 0) | |
3633 | req_set_fail_links(req); | |
e1e16097 | 3634 | io_req_complete(req, ret); |
c1ca757b JA |
3635 | return 0; |
3636 | #else | |
3637 | return -EOPNOTSUPP; | |
3638 | #endif | |
3639 | } | |
3640 | ||
4840e418 JA |
3641 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3642 | { | |
3643 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3644 | return -EINVAL; | |
3232dd02 PB |
3645 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3646 | return -EINVAL; | |
4840e418 JA |
3647 | |
3648 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3649 | req->fadvise.len = READ_ONCE(sqe->len); | |
3650 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3651 | return 0; | |
3652 | } | |
3653 | ||
014db007 | 3654 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3655 | { |
3656 | struct io_fadvise *fa = &req->fadvise; | |
3657 | int ret; | |
3658 | ||
3e69426d JA |
3659 | if (force_nonblock) { |
3660 | switch (fa->advice) { | |
3661 | case POSIX_FADV_NORMAL: | |
3662 | case POSIX_FADV_RANDOM: | |
3663 | case POSIX_FADV_SEQUENTIAL: | |
3664 | break; | |
3665 | default: | |
3666 | return -EAGAIN; | |
3667 | } | |
3668 | } | |
4840e418 JA |
3669 | |
3670 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3671 | if (ret < 0) | |
3672 | req_set_fail_links(req); | |
e1e16097 | 3673 | io_req_complete(req, ret); |
4840e418 JA |
3674 | return 0; |
3675 | } | |
3676 | ||
eddc7ef5 JA |
3677 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3678 | { | |
3232dd02 PB |
3679 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3680 | return -EINVAL; | |
eddc7ef5 JA |
3681 | if (sqe->ioprio || sqe->buf_index) |
3682 | return -EINVAL; | |
9c280f90 | 3683 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3684 | return -EBADF; |
eddc7ef5 | 3685 | |
1d9e1288 BM |
3686 | req->statx.dfd = READ_ONCE(sqe->fd); |
3687 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3688 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3689 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3690 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3691 | |
3692 | return 0; | |
3693 | } | |
3694 | ||
014db007 | 3695 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3696 | { |
1d9e1288 | 3697 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3698 | int ret; |
3699 | ||
5b0bbee4 JA |
3700 | if (force_nonblock) { |
3701 | /* only need file table for an actual valid fd */ | |
3702 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3703 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3704 | return -EAGAIN; |
5b0bbee4 | 3705 | } |
eddc7ef5 | 3706 | |
e62753e4 BM |
3707 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3708 | ctx->buffer); | |
eddc7ef5 | 3709 | |
eddc7ef5 JA |
3710 | if (ret < 0) |
3711 | req_set_fail_links(req); | |
e1e16097 | 3712 | io_req_complete(req, ret); |
eddc7ef5 JA |
3713 | return 0; |
3714 | } | |
3715 | ||
b5dba59e JA |
3716 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3717 | { | |
3718 | /* | |
3719 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3720 | * leave the 'file' in an undeterminate state, and here need to modify |
3721 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3722 | */ |
7cdaf587 | 3723 | io_req_init_async(req); |
b5dba59e JA |
3724 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3725 | ||
3232dd02 PB |
3726 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3727 | return -EINVAL; | |
b5dba59e JA |
3728 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3729 | sqe->rw_flags || sqe->buf_index) | |
3730 | return -EINVAL; | |
9c280f90 | 3731 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3732 | return -EBADF; |
b5dba59e JA |
3733 | |
3734 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3735 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3736 | req->close.fd == req->ctx->ring_fd) | |
3737 | return -EBADF; | |
b5dba59e | 3738 | |
3af73b28 | 3739 | req->close.put_file = NULL; |
b5dba59e | 3740 | return 0; |
b5dba59e JA |
3741 | } |
3742 | ||
229a7b63 JA |
3743 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
3744 | struct io_comp_state *cs) | |
b5dba59e | 3745 | { |
3af73b28 | 3746 | struct io_close *close = &req->close; |
b5dba59e JA |
3747 | int ret; |
3748 | ||
3af73b28 PB |
3749 | /* might be already done during nonblock submission */ |
3750 | if (!close->put_file) { | |
3751 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3752 | if (ret < 0) | |
3753 | return (ret == -ENOENT) ? -EBADF : ret; | |
3754 | } | |
b5dba59e JA |
3755 | |
3756 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3757 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
3758 | /* was never set, but play safe */ |
3759 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 3760 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 3761 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 3762 | return -EAGAIN; |
a2100672 | 3763 | } |
b5dba59e | 3764 | |
3af73b28 PB |
3765 | /* No ->flush() or already async, safely close from here */ |
3766 | ret = filp_close(close->put_file, req->work.files); | |
3767 | if (ret < 0) | |
3768 | req_set_fail_links(req); | |
3af73b28 PB |
3769 | fput(close->put_file); |
3770 | close->put_file = NULL; | |
229a7b63 | 3771 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 3772 | return 0; |
b5dba59e JA |
3773 | } |
3774 | ||
3529d8c2 | 3775 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3776 | { |
3777 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3778 | |
3779 | if (!req->file) | |
3780 | return -EBADF; | |
5d17b4a4 JA |
3781 | |
3782 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3783 | return -EINVAL; | |
3784 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3785 | return -EINVAL; | |
3786 | ||
8ed8d3c3 JA |
3787 | req->sync.off = READ_ONCE(sqe->off); |
3788 | req->sync.len = READ_ONCE(sqe->len); | |
3789 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3790 | return 0; |
3791 | } | |
3792 | ||
ac45abc0 | 3793 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3794 | { |
8ed8d3c3 JA |
3795 | int ret; |
3796 | ||
ac45abc0 PB |
3797 | /* sync_file_range always requires a blocking context */ |
3798 | if (force_nonblock) | |
3799 | return -EAGAIN; | |
3800 | ||
9adbd45d | 3801 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3802 | req->sync.flags); |
3803 | if (ret < 0) | |
3804 | req_set_fail_links(req); | |
e1e16097 | 3805 | io_req_complete(req, ret); |
5d17b4a4 JA |
3806 | return 0; |
3807 | } | |
3808 | ||
469956e8 | 3809 | #if defined(CONFIG_NET) |
02d27d89 PB |
3810 | static int io_setup_async_msg(struct io_kiocb *req, |
3811 | struct io_async_msghdr *kmsg) | |
3812 | { | |
3813 | if (req->io) | |
3814 | return -EAGAIN; | |
3815 | if (io_alloc_async_ctx(req)) { | |
3816 | if (kmsg->iov != kmsg->fast_iov) | |
3817 | kfree(kmsg->iov); | |
3818 | return -ENOMEM; | |
3819 | } | |
3820 | req->flags |= REQ_F_NEED_CLEANUP; | |
3821 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3822 | return -EAGAIN; | |
3823 | } | |
3824 | ||
3529d8c2 | 3825 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3826 | { |
e47293fd | 3827 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3828 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3829 | int ret; |
03b1230c | 3830 | |
d2b6f48b PB |
3831 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3832 | return -EINVAL; | |
3833 | ||
e47293fd JA |
3834 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3835 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
fddaface | 3836 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3837 | |
d8768362 JA |
3838 | #ifdef CONFIG_COMPAT |
3839 | if (req->ctx->compat) | |
3840 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3841 | #endif | |
3842 | ||
fddaface | 3843 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3844 | return 0; |
5f798bea PB |
3845 | /* iovec is already imported */ |
3846 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3847 | return 0; | |
3529d8c2 | 3848 | |
d9688565 | 3849 | io->msg.iov = io->msg.fast_iov; |
99bc4c38 | 3850 | ret = sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags, |
e47293fd | 3851 | &io->msg.iov); |
99bc4c38 PB |
3852 | if (!ret) |
3853 | req->flags |= REQ_F_NEED_CLEANUP; | |
3854 | return ret; | |
03b1230c JA |
3855 | } |
3856 | ||
229a7b63 JA |
3857 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
3858 | struct io_comp_state *cs) | |
aa1fa28f | 3859 | { |
0b416c3e | 3860 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3861 | struct socket *sock; |
3862 | int ret; | |
3863 | ||
0fa03c62 JA |
3864 | sock = sock_from_file(req->file, &ret); |
3865 | if (sock) { | |
b7bb4f7d | 3866 | struct io_async_ctx io; |
0fa03c62 JA |
3867 | unsigned flags; |
3868 | ||
03b1230c | 3869 | if (req->io) { |
0b416c3e | 3870 | kmsg = &req->io->msg; |
b537916c | 3871 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3872 | /* if iov is set, it's allocated already */ |
3873 | if (!kmsg->iov) | |
3874 | kmsg->iov = kmsg->fast_iov; | |
3875 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3876 | } else { |
3529d8c2 JA |
3877 | struct io_sr_msg *sr = &req->sr_msg; |
3878 | ||
0b416c3e | 3879 | kmsg = &io.msg; |
b537916c | 3880 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 JA |
3881 | |
3882 | io.msg.iov = io.msg.fast_iov; | |
3883 | ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, | |
3884 | sr->msg_flags, &io.msg.iov); | |
03b1230c | 3885 | if (ret) |
3529d8c2 | 3886 | return ret; |
03b1230c | 3887 | } |
0fa03c62 | 3888 | |
e47293fd JA |
3889 | flags = req->sr_msg.msg_flags; |
3890 | if (flags & MSG_DONTWAIT) | |
3891 | req->flags |= REQ_F_NOWAIT; | |
3892 | else if (force_nonblock) | |
3893 | flags |= MSG_DONTWAIT; | |
3894 | ||
0b416c3e | 3895 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3896 | if (force_nonblock && ret == -EAGAIN) |
3897 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3898 | if (ret == -ERESTARTSYS) |
3899 | ret = -EINTR; | |
0fa03c62 JA |
3900 | } |
3901 | ||
1e95081c | 3902 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3903 | kfree(kmsg->iov); |
99bc4c38 | 3904 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
3905 | if (ret < 0) |
3906 | req_set_fail_links(req); | |
229a7b63 | 3907 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 3908 | return 0; |
03b1230c | 3909 | } |
aa1fa28f | 3910 | |
229a7b63 JA |
3911 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
3912 | struct io_comp_state *cs) | |
fddaface | 3913 | { |
fddaface JA |
3914 | struct socket *sock; |
3915 | int ret; | |
3916 | ||
fddaface JA |
3917 | sock = sock_from_file(req->file, &ret); |
3918 | if (sock) { | |
3919 | struct io_sr_msg *sr = &req->sr_msg; | |
3920 | struct msghdr msg; | |
3921 | struct iovec iov; | |
3922 | unsigned flags; | |
3923 | ||
3924 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3925 | &msg.msg_iter); | |
3926 | if (ret) | |
3927 | return ret; | |
3928 | ||
3929 | msg.msg_name = NULL; | |
3930 | msg.msg_control = NULL; | |
3931 | msg.msg_controllen = 0; | |
3932 | msg.msg_namelen = 0; | |
3933 | ||
3934 | flags = req->sr_msg.msg_flags; | |
3935 | if (flags & MSG_DONTWAIT) | |
3936 | req->flags |= REQ_F_NOWAIT; | |
3937 | else if (force_nonblock) | |
3938 | flags |= MSG_DONTWAIT; | |
3939 | ||
0b7b21e4 JA |
3940 | msg.msg_flags = flags; |
3941 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3942 | if (force_nonblock && ret == -EAGAIN) |
3943 | return -EAGAIN; | |
3944 | if (ret == -ERESTARTSYS) | |
3945 | ret = -EINTR; | |
3946 | } | |
3947 | ||
fddaface JA |
3948 | if (ret < 0) |
3949 | req_set_fail_links(req); | |
229a7b63 | 3950 | __io_req_complete(req, ret, 0, cs); |
fddaface | 3951 | return 0; |
fddaface JA |
3952 | } |
3953 | ||
52de1fe1 JA |
3954 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) |
3955 | { | |
3956 | struct io_sr_msg *sr = &req->sr_msg; | |
3957 | struct iovec __user *uiov; | |
3958 | size_t iov_len; | |
3959 | int ret; | |
3960 | ||
3961 | ret = __copy_msghdr_from_user(&io->msg.msg, sr->msg, &io->msg.uaddr, | |
3962 | &uiov, &iov_len); | |
3963 | if (ret) | |
3964 | return ret; | |
3965 | ||
3966 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3967 | if (iov_len > 1) | |
3968 | return -EINVAL; | |
3969 | if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov))) | |
3970 | return -EFAULT; | |
3971 | sr->len = io->msg.iov[0].iov_len; | |
3972 | iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1, | |
3973 | sr->len); | |
3974 | io->msg.iov = NULL; | |
3975 | } else { | |
3976 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
3977 | &io->msg.iov, &io->msg.msg.msg_iter); | |
3978 | if (ret > 0) | |
3979 | ret = 0; | |
3980 | } | |
3981 | ||
3982 | return ret; | |
3983 | } | |
3984 | ||
3985 | #ifdef CONFIG_COMPAT | |
3986 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
3987 | struct io_async_ctx *io) | |
3988 | { | |
3989 | struct compat_msghdr __user *msg_compat; | |
3990 | struct io_sr_msg *sr = &req->sr_msg; | |
3991 | struct compat_iovec __user *uiov; | |
3992 | compat_uptr_t ptr; | |
3993 | compat_size_t len; | |
3994 | int ret; | |
3995 | ||
3996 | msg_compat = (struct compat_msghdr __user *) sr->msg; | |
3997 | ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr, | |
3998 | &ptr, &len); | |
3999 | if (ret) | |
4000 | return ret; | |
4001 | ||
4002 | uiov = compat_ptr(ptr); | |
4003 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4004 | compat_ssize_t clen; | |
4005 | ||
4006 | if (len > 1) | |
4007 | return -EINVAL; | |
4008 | if (!access_ok(uiov, sizeof(*uiov))) | |
4009 | return -EFAULT; | |
4010 | if (__get_user(clen, &uiov->iov_len)) | |
4011 | return -EFAULT; | |
4012 | if (clen < 0) | |
4013 | return -EINVAL; | |
4014 | sr->len = io->msg.iov[0].iov_len; | |
4015 | io->msg.iov = NULL; | |
4016 | } else { | |
4017 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
4018 | &io->msg.iov, | |
4019 | &io->msg.msg.msg_iter); | |
4020 | if (ret < 0) | |
4021 | return ret; | |
4022 | } | |
4023 | ||
4024 | return 0; | |
4025 | } | |
4026 | #endif | |
4027 | ||
4028 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) | |
4029 | { | |
4030 | io->msg.iov = io->msg.fast_iov; | |
4031 | ||
4032 | #ifdef CONFIG_COMPAT | |
4033 | if (req->ctx->compat) | |
4034 | return __io_compat_recvmsg_copy_hdr(req, io); | |
fddaface | 4035 | #endif |
52de1fe1 JA |
4036 | |
4037 | return __io_recvmsg_copy_hdr(req, io); | |
4038 | } | |
4039 | ||
bcda7baa JA |
4040 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
4041 | int *cflags, bool needs_lock) | |
4042 | { | |
4043 | struct io_sr_msg *sr = &req->sr_msg; | |
4044 | struct io_buffer *kbuf; | |
4045 | ||
4046 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
4047 | return NULL; | |
4048 | ||
4049 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
4050 | if (IS_ERR(kbuf)) | |
4051 | return kbuf; | |
4052 | ||
4053 | sr->kbuf = kbuf; | |
4054 | req->flags |= REQ_F_BUFFER_SELECTED; | |
4055 | ||
4056 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
4057 | *cflags |= IORING_CQE_F_BUFFER; | |
4058 | return kbuf; | |
fddaface JA |
4059 | } |
4060 | ||
3529d8c2 JA |
4061 | static int io_recvmsg_prep(struct io_kiocb *req, |
4062 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4063 | { |
e47293fd | 4064 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4065 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4066 | int ret; |
3529d8c2 | 4067 | |
d2b6f48b PB |
4068 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4069 | return -EINVAL; | |
4070 | ||
3529d8c2 JA |
4071 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
4072 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
0b7b21e4 | 4073 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4074 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4075 | |
d8768362 JA |
4076 | #ifdef CONFIG_COMPAT |
4077 | if (req->ctx->compat) | |
4078 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4079 | #endif | |
4080 | ||
fddaface | 4081 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4082 | return 0; |
5f798bea PB |
4083 | /* iovec is already imported */ |
4084 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4085 | return 0; | |
03b1230c | 4086 | |
52de1fe1 | 4087 | ret = io_recvmsg_copy_hdr(req, io); |
99bc4c38 PB |
4088 | if (!ret) |
4089 | req->flags |= REQ_F_NEED_CLEANUP; | |
4090 | return ret; | |
aa1fa28f JA |
4091 | } |
4092 | ||
229a7b63 JA |
4093 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4094 | struct io_comp_state *cs) | |
aa1fa28f | 4095 | { |
0b416c3e | 4096 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 4097 | struct socket *sock; |
52de1fe1 | 4098 | int ret, cflags = 0; |
03b1230c | 4099 | |
03b1230c JA |
4100 | sock = sock_from_file(req->file, &ret); |
4101 | if (sock) { | |
52de1fe1 | 4102 | struct io_buffer *kbuf; |
b7bb4f7d | 4103 | struct io_async_ctx io; |
03b1230c JA |
4104 | unsigned flags; |
4105 | ||
03b1230c | 4106 | if (req->io) { |
0b416c3e | 4107 | kmsg = &req->io->msg; |
b537916c | 4108 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
4109 | /* if iov is set, it's allocated already */ |
4110 | if (!kmsg->iov) | |
4111 | kmsg->iov = kmsg->fast_iov; | |
4112 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 4113 | } else { |
0b416c3e | 4114 | kmsg = &io.msg; |
b537916c | 4115 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 | 4116 | |
52de1fe1 | 4117 | ret = io_recvmsg_copy_hdr(req, &io); |
03b1230c | 4118 | if (ret) |
3529d8c2 | 4119 | return ret; |
03b1230c JA |
4120 | } |
4121 | ||
52de1fe1 JA |
4122 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
4123 | if (IS_ERR(kbuf)) { | |
4124 | return PTR_ERR(kbuf); | |
4125 | } else if (kbuf) { | |
4126 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
4127 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4128 | 1, req->sr_msg.len); | |
4129 | } | |
4130 | ||
e47293fd JA |
4131 | flags = req->sr_msg.msg_flags; |
4132 | if (flags & MSG_DONTWAIT) | |
4133 | req->flags |= REQ_F_NOWAIT; | |
4134 | else if (force_nonblock) | |
4135 | flags |= MSG_DONTWAIT; | |
4136 | ||
4137 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, | |
4138 | kmsg->uaddr, flags); | |
02d27d89 PB |
4139 | if (force_nonblock && ret == -EAGAIN) |
4140 | return io_setup_async_msg(req, kmsg); | |
03b1230c JA |
4141 | if (ret == -ERESTARTSYS) |
4142 | ret = -EINTR; | |
4143 | } | |
4144 | ||
1e95081c | 4145 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4146 | kfree(kmsg->iov); |
99bc4c38 | 4147 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4148 | if (ret < 0) |
4149 | req_set_fail_links(req); | |
229a7b63 | 4150 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4151 | return 0; |
0fa03c62 | 4152 | } |
5d17b4a4 | 4153 | |
229a7b63 JA |
4154 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4155 | struct io_comp_state *cs) | |
fddaface | 4156 | { |
bcda7baa | 4157 | struct io_buffer *kbuf = NULL; |
fddaface | 4158 | struct socket *sock; |
bcda7baa | 4159 | int ret, cflags = 0; |
fddaface | 4160 | |
fddaface JA |
4161 | sock = sock_from_file(req->file, &ret); |
4162 | if (sock) { | |
4163 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 4164 | void __user *buf = sr->buf; |
fddaface JA |
4165 | struct msghdr msg; |
4166 | struct iovec iov; | |
4167 | unsigned flags; | |
4168 | ||
bcda7baa JA |
4169 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
4170 | if (IS_ERR(kbuf)) | |
4171 | return PTR_ERR(kbuf); | |
4172 | else if (kbuf) | |
4173 | buf = u64_to_user_ptr(kbuf->addr); | |
4174 | ||
4175 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 4176 | &msg.msg_iter); |
bcda7baa JA |
4177 | if (ret) { |
4178 | kfree(kbuf); | |
fddaface | 4179 | return ret; |
bcda7baa | 4180 | } |
fddaface | 4181 | |
bcda7baa | 4182 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
4183 | msg.msg_name = NULL; |
4184 | msg.msg_control = NULL; | |
4185 | msg.msg_controllen = 0; | |
4186 | msg.msg_namelen = 0; | |
4187 | msg.msg_iocb = NULL; | |
4188 | msg.msg_flags = 0; | |
4189 | ||
4190 | flags = req->sr_msg.msg_flags; | |
4191 | if (flags & MSG_DONTWAIT) | |
4192 | req->flags |= REQ_F_NOWAIT; | |
4193 | else if (force_nonblock) | |
4194 | flags |= MSG_DONTWAIT; | |
4195 | ||
0b7b21e4 | 4196 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
4197 | if (force_nonblock && ret == -EAGAIN) |
4198 | return -EAGAIN; | |
4199 | if (ret == -ERESTARTSYS) | |
4200 | ret = -EINTR; | |
4201 | } | |
4202 | ||
bcda7baa JA |
4203 | kfree(kbuf); |
4204 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
fddaface JA |
4205 | if (ret < 0) |
4206 | req_set_fail_links(req); | |
229a7b63 | 4207 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4208 | return 0; |
fddaface JA |
4209 | } |
4210 | ||
3529d8c2 | 4211 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4212 | { |
8ed8d3c3 JA |
4213 | struct io_accept *accept = &req->accept; |
4214 | ||
17f2fe35 JA |
4215 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4216 | return -EINVAL; | |
8042d6ce | 4217 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4218 | return -EINVAL; |
4219 | ||
d55e5f5b JA |
4220 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4221 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4222 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4223 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4224 | return 0; |
8ed8d3c3 | 4225 | } |
17f2fe35 | 4226 | |
229a7b63 JA |
4227 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4228 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4229 | { |
4230 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4231 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4232 | int ret; |
4233 | ||
e697deed JX |
4234 | if (req->file->f_flags & O_NONBLOCK) |
4235 | req->flags |= REQ_F_NOWAIT; | |
4236 | ||
8ed8d3c3 | 4237 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4238 | accept->addr_len, accept->flags, |
4239 | accept->nofile); | |
8ed8d3c3 | 4240 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4241 | return -EAGAIN; |
ac45abc0 PB |
4242 | if (ret < 0) { |
4243 | if (ret == -ERESTARTSYS) | |
4244 | ret = -EINTR; | |
4e88d6e7 | 4245 | req_set_fail_links(req); |
ac45abc0 | 4246 | } |
229a7b63 | 4247 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4248 | return 0; |
8ed8d3c3 JA |
4249 | } |
4250 | ||
3529d8c2 | 4251 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4252 | { |
3529d8c2 JA |
4253 | struct io_connect *conn = &req->connect; |
4254 | struct io_async_ctx *io = req->io; | |
f499a021 | 4255 | |
3fbb51c1 JA |
4256 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4257 | return -EINVAL; | |
4258 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4259 | return -EINVAL; | |
4260 | ||
3529d8c2 JA |
4261 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4262 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4263 | ||
4264 | if (!io) | |
4265 | return 0; | |
4266 | ||
4267 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4268 | &io->connect.address); |
f499a021 JA |
4269 | } |
4270 | ||
229a7b63 JA |
4271 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4272 | struct io_comp_state *cs) | |
f8e85cf2 | 4273 | { |
f499a021 | 4274 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4275 | unsigned file_flags; |
3fbb51c1 | 4276 | int ret; |
f8e85cf2 | 4277 | |
f499a021 JA |
4278 | if (req->io) { |
4279 | io = req->io; | |
4280 | } else { | |
3529d8c2 JA |
4281 | ret = move_addr_to_kernel(req->connect.addr, |
4282 | req->connect.addr_len, | |
4283 | &__io.connect.address); | |
f499a021 JA |
4284 | if (ret) |
4285 | goto out; | |
4286 | io = &__io; | |
4287 | } | |
4288 | ||
3fbb51c1 JA |
4289 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4290 | ||
4291 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4292 | req->connect.addr_len, file_flags); | |
87f80d62 | 4293 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4294 | if (req->io) |
4295 | return -EAGAIN; | |
4296 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4297 | ret = -ENOMEM; |
4298 | goto out; | |
4299 | } | |
b7bb4f7d | 4300 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4301 | return -EAGAIN; |
f499a021 | 4302 | } |
f8e85cf2 JA |
4303 | if (ret == -ERESTARTSYS) |
4304 | ret = -EINTR; | |
f499a021 | 4305 | out: |
4e88d6e7 JA |
4306 | if (ret < 0) |
4307 | req_set_fail_links(req); | |
229a7b63 | 4308 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4309 | return 0; |
469956e8 Y |
4310 | } |
4311 | #else /* !CONFIG_NET */ | |
4312 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4313 | { | |
f8e85cf2 | 4314 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4315 | } |
4316 | ||
469956e8 Y |
4317 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
4318 | { | |
4319 | return -EOPNOTSUPP; | |
4320 | } | |
4321 | ||
4322 | static int io_send(struct io_kiocb *req, bool force_nonblock) | |
4323 | { | |
4324 | return -EOPNOTSUPP; | |
4325 | } | |
4326 | ||
4327 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4328 | const struct io_uring_sqe *sqe) | |
4329 | { | |
4330 | return -EOPNOTSUPP; | |
4331 | } | |
4332 | ||
4333 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) | |
4334 | { | |
4335 | return -EOPNOTSUPP; | |
4336 | } | |
4337 | ||
4338 | static int io_recv(struct io_kiocb *req, bool force_nonblock) | |
4339 | { | |
4340 | return -EOPNOTSUPP; | |
4341 | } | |
4342 | ||
4343 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4344 | { | |
4345 | return -EOPNOTSUPP; | |
4346 | } | |
4347 | ||
4348 | static int io_accept(struct io_kiocb *req, bool force_nonblock) | |
4349 | { | |
4350 | return -EOPNOTSUPP; | |
4351 | } | |
4352 | ||
4353 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4354 | { | |
4355 | return -EOPNOTSUPP; | |
4356 | } | |
4357 | ||
4358 | static int io_connect(struct io_kiocb *req, bool force_nonblock) | |
4359 | { | |
f8e85cf2 | 4360 | return -EOPNOTSUPP; |
f8e85cf2 | 4361 | } |
469956e8 | 4362 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4363 | |
d7718a9d JA |
4364 | struct io_poll_table { |
4365 | struct poll_table_struct pt; | |
4366 | struct io_kiocb *req; | |
4367 | int error; | |
4368 | }; | |
4369 | ||
d7718a9d JA |
4370 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4371 | __poll_t mask, task_work_func_t func) | |
4372 | { | |
4373 | struct task_struct *tsk; | |
aa96bf8a | 4374 | int ret; |
d7718a9d JA |
4375 | |
4376 | /* for instances that support it check for an event match first: */ | |
4377 | if (mask && !(mask & poll->events)) | |
4378 | return 0; | |
4379 | ||
4380 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4381 | ||
4382 | list_del_init(&poll->wait.entry); | |
4383 | ||
4384 | tsk = req->task; | |
4385 | req->result = mask; | |
4386 | init_task_work(&req->task_work, func); | |
4387 | /* | |
e3aabf95 JA |
4388 | * If this fails, then the task is exiting. When a task exits, the |
4389 | * work gets canceled, so just cancel this request as well instead | |
4390 | * of executing it. We can't safely execute it anyway, as we may not | |
4391 | * have the needed state needed for it anyway. | |
d7718a9d | 4392 | */ |
aa96bf8a JA |
4393 | ret = task_work_add(tsk, &req->task_work, true); |
4394 | if (unlikely(ret)) { | |
e3aabf95 | 4395 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a JA |
4396 | tsk = io_wq_get_task(req->ctx->io_wq); |
4397 | task_work_add(tsk, &req->task_work, true); | |
4398 | } | |
d7718a9d JA |
4399 | wake_up_process(tsk); |
4400 | return 1; | |
4401 | } | |
4402 | ||
74ce6ce4 JA |
4403 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4404 | __acquires(&req->ctx->completion_lock) | |
4405 | { | |
4406 | struct io_ring_ctx *ctx = req->ctx; | |
4407 | ||
4408 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4409 | struct poll_table_struct pt = { ._key = poll->events }; | |
4410 | ||
4411 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4412 | } | |
4413 | ||
4414 | spin_lock_irq(&ctx->completion_lock); | |
4415 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4416 | add_wait_queue(poll->head, &poll->wait); | |
4417 | return true; | |
4418 | } | |
4419 | ||
4420 | return false; | |
4421 | } | |
4422 | ||
18bceab1 JA |
4423 | static void io_poll_remove_double(struct io_kiocb *req) |
4424 | { | |
4425 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4426 | ||
4427 | lockdep_assert_held(&req->ctx->completion_lock); | |
4428 | ||
4429 | if (poll && poll->head) { | |
4430 | struct wait_queue_head *head = poll->head; | |
4431 | ||
4432 | spin_lock(&head->lock); | |
4433 | list_del_init(&poll->wait.entry); | |
4434 | if (poll->wait.private) | |
4435 | refcount_dec(&req->refs); | |
4436 | poll->head = NULL; | |
4437 | spin_unlock(&head->lock); | |
4438 | } | |
4439 | } | |
4440 | ||
4441 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4442 | { | |
4443 | struct io_ring_ctx *ctx = req->ctx; | |
4444 | ||
4445 | io_poll_remove_double(req); | |
4446 | req->poll.done = true; | |
4447 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4448 | io_commit_cqring(ctx); | |
4449 | } | |
4450 | ||
4451 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4452 | { | |
4453 | struct io_ring_ctx *ctx = req->ctx; | |
4454 | ||
4455 | if (io_poll_rewait(req, &req->poll)) { | |
4456 | spin_unlock_irq(&ctx->completion_lock); | |
4457 | return; | |
4458 | } | |
4459 | ||
4460 | hash_del(&req->hash_node); | |
4461 | io_poll_complete(req, req->result, 0); | |
4462 | req->flags |= REQ_F_COMP_LOCKED; | |
4463 | io_put_req_find_next(req, nxt); | |
4464 | spin_unlock_irq(&ctx->completion_lock); | |
4465 | ||
4466 | io_cqring_ev_posted(ctx); | |
4467 | } | |
4468 | ||
4469 | static void io_poll_task_func(struct callback_head *cb) | |
4470 | { | |
4471 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4472 | struct io_kiocb *nxt = NULL; | |
4473 | ||
4474 | io_poll_task_handler(req, &nxt); | |
4475 | if (nxt) { | |
4476 | struct io_ring_ctx *ctx = nxt->ctx; | |
4477 | ||
4478 | mutex_lock(&ctx->uring_lock); | |
f13fad7b | 4479 | __io_queue_sqe(nxt, NULL, NULL); |
18bceab1 JA |
4480 | mutex_unlock(&ctx->uring_lock); |
4481 | } | |
4482 | } | |
4483 | ||
4484 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4485 | int sync, void *key) | |
4486 | { | |
4487 | struct io_kiocb *req = wait->private; | |
4488 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4489 | __poll_t mask = key_to_poll(key); | |
4490 | ||
4491 | /* for instances that support it check for an event match first: */ | |
4492 | if (mask && !(mask & poll->events)) | |
4493 | return 0; | |
4494 | ||
4495 | if (req->poll.head) { | |
4496 | bool done; | |
4497 | ||
4498 | spin_lock(&req->poll.head->lock); | |
4499 | done = list_empty(&req->poll.wait.entry); | |
4500 | if (!done) | |
4501 | list_del_init(&req->poll.wait.entry); | |
4502 | spin_unlock(&req->poll.head->lock); | |
4503 | if (!done) | |
4504 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4505 | } | |
4506 | refcount_dec(&req->refs); | |
4507 | return 1; | |
4508 | } | |
4509 | ||
4510 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4511 | wait_queue_func_t wake_func) | |
4512 | { | |
4513 | poll->head = NULL; | |
4514 | poll->done = false; | |
4515 | poll->canceled = false; | |
4516 | poll->events = events; | |
4517 | INIT_LIST_HEAD(&poll->wait.entry); | |
4518 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4519 | } | |
4520 | ||
4521 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
4522 | struct wait_queue_head *head) | |
4523 | { | |
4524 | struct io_kiocb *req = pt->req; | |
4525 | ||
4526 | /* | |
4527 | * If poll->head is already set, it's because the file being polled | |
4528 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4529 | * for write). Setup a separate io_poll_iocb if this happens. | |
4530 | */ | |
4531 | if (unlikely(poll->head)) { | |
4532 | /* already have a 2nd entry, fail a third attempt */ | |
4533 | if (req->io) { | |
4534 | pt->error = -EINVAL; | |
4535 | return; | |
4536 | } | |
4537 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4538 | if (!poll) { | |
4539 | pt->error = -ENOMEM; | |
4540 | return; | |
4541 | } | |
4542 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4543 | refcount_inc(&req->refs); | |
4544 | poll->wait.private = req; | |
4545 | req->io = (void *) poll; | |
4546 | } | |
4547 | ||
4548 | pt->error = 0; | |
4549 | poll->head = head; | |
a31eb4a2 JX |
4550 | |
4551 | if (poll->events & EPOLLEXCLUSIVE) | |
4552 | add_wait_queue_exclusive(head, &poll->wait); | |
4553 | else | |
4554 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4555 | } |
4556 | ||
4557 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4558 | struct poll_table_struct *p) | |
4559 | { | |
4560 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4561 | ||
4562 | __io_queue_proc(&pt->req->apoll->poll, pt, head); | |
4563 | } | |
4564 | ||
d7718a9d JA |
4565 | static void io_async_task_func(struct callback_head *cb) |
4566 | { | |
4567 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4568 | struct async_poll *apoll = req->apoll; | |
4569 | struct io_ring_ctx *ctx = req->ctx; | |
31067255 | 4570 | bool canceled = false; |
d7718a9d JA |
4571 | |
4572 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4573 | ||
74ce6ce4 | 4574 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4575 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4576 | return; |
d7718a9d JA |
4577 | } |
4578 | ||
31067255 JA |
4579 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
4580 | if (hash_hashed(&req->hash_node)) { | |
74ce6ce4 | 4581 | hash_del(&req->hash_node); |
31067255 JA |
4582 | } else { |
4583 | canceled = READ_ONCE(apoll->poll.canceled); | |
4584 | if (canceled) { | |
4585 | io_cqring_fill_event(req, -ECANCELED); | |
4586 | io_commit_cqring(ctx); | |
4587 | } | |
2bae047e JA |
4588 | } |
4589 | ||
74ce6ce4 JA |
4590 | spin_unlock_irq(&ctx->completion_lock); |
4591 | ||
44575a67 | 4592 | /* restore ->work in case we need to retry again */ |
405a5d2b XW |
4593 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4594 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
31067255 | 4595 | kfree(apoll); |
44575a67 | 4596 | |
31067255 JA |
4597 | if (!canceled) { |
4598 | __set_current_state(TASK_RUNNING); | |
9d8426a0 | 4599 | if (io_sq_thread_acquire_mm(ctx, req)) { |
e1e16097 | 4600 | io_cqring_add_event(req, -EFAULT, 0); |
9d8426a0 JA |
4601 | goto end_req; |
4602 | } | |
31067255 | 4603 | mutex_lock(&ctx->uring_lock); |
f13fad7b | 4604 | __io_queue_sqe(req, NULL, NULL); |
31067255 JA |
4605 | mutex_unlock(&ctx->uring_lock); |
4606 | } else { | |
2bae047e | 4607 | io_cqring_ev_posted(ctx); |
9d8426a0 | 4608 | end_req: |
2bae047e | 4609 | req_set_fail_links(req); |
44575a67 | 4610 | io_double_put_req(req); |
2bae047e | 4611 | } |
d7718a9d JA |
4612 | } |
4613 | ||
4614 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4615 | void *key) | |
4616 | { | |
4617 | struct io_kiocb *req = wait->private; | |
4618 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4619 | ||
4620 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4621 | key_to_poll(key)); | |
4622 | ||
4623 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4624 | } | |
4625 | ||
4626 | static void io_poll_req_insert(struct io_kiocb *req) | |
4627 | { | |
4628 | struct io_ring_ctx *ctx = req->ctx; | |
4629 | struct hlist_head *list; | |
4630 | ||
4631 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4632 | hlist_add_head(&req->hash_node, list); | |
4633 | } | |
4634 | ||
4635 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4636 | struct io_poll_iocb *poll, | |
4637 | struct io_poll_table *ipt, __poll_t mask, | |
4638 | wait_queue_func_t wake_func) | |
4639 | __acquires(&ctx->completion_lock) | |
4640 | { | |
4641 | struct io_ring_ctx *ctx = req->ctx; | |
4642 | bool cancel = false; | |
4643 | ||
18bceab1 | 4644 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4645 | poll->file = req->file; |
18bceab1 | 4646 | poll->wait.private = req; |
d7718a9d JA |
4647 | |
4648 | ipt->pt._key = mask; | |
4649 | ipt->req = req; | |
4650 | ipt->error = -EINVAL; | |
4651 | ||
d7718a9d JA |
4652 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4653 | ||
4654 | spin_lock_irq(&ctx->completion_lock); | |
4655 | if (likely(poll->head)) { | |
4656 | spin_lock(&poll->head->lock); | |
4657 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4658 | if (ipt->error) | |
4659 | cancel = true; | |
4660 | ipt->error = 0; | |
4661 | mask = 0; | |
4662 | } | |
4663 | if (mask || ipt->error) | |
4664 | list_del_init(&poll->wait.entry); | |
4665 | else if (cancel) | |
4666 | WRITE_ONCE(poll->canceled, true); | |
4667 | else if (!poll->done) /* actually waiting for an event */ | |
4668 | io_poll_req_insert(req); | |
4669 | spin_unlock(&poll->head->lock); | |
4670 | } | |
4671 | ||
4672 | return mask; | |
4673 | } | |
4674 | ||
4675 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4676 | { | |
4677 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4678 | struct io_ring_ctx *ctx = req->ctx; | |
4679 | struct async_poll *apoll; | |
4680 | struct io_poll_table ipt; | |
4681 | __poll_t mask, ret; | |
18bceab1 | 4682 | bool had_io; |
d7718a9d JA |
4683 | |
4684 | if (!req->file || !file_can_poll(req->file)) | |
4685 | return false; | |
24c74678 | 4686 | if (req->flags & REQ_F_POLLED) |
d7718a9d JA |
4687 | return false; |
4688 | if (!def->pollin && !def->pollout) | |
4689 | return false; | |
4690 | ||
4691 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4692 | if (unlikely(!apoll)) | |
4693 | return false; | |
4694 | ||
4695 | req->flags |= REQ_F_POLLED; | |
405a5d2b XW |
4696 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4697 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
18bceab1 | 4698 | had_io = req->io != NULL; |
d7718a9d | 4699 | |
4dd2824d | 4700 | io_get_req_task(req); |
d7718a9d JA |
4701 | req->apoll = apoll; |
4702 | INIT_HLIST_NODE(&req->hash_node); | |
4703 | ||
8755d97a | 4704 | mask = 0; |
d7718a9d | 4705 | if (def->pollin) |
8755d97a | 4706 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4707 | if (def->pollout) |
4708 | mask |= POLLOUT | POLLWRNORM; | |
4709 | mask |= POLLERR | POLLPRI; | |
4710 | ||
4711 | ipt.pt._qproc = io_async_queue_proc; | |
4712 | ||
4713 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4714 | io_async_wake); | |
4715 | if (ret) { | |
4716 | ipt.error = 0; | |
18bceab1 JA |
4717 | /* only remove double add if we did it here */ |
4718 | if (!had_io) | |
4719 | io_poll_remove_double(req); | |
d7718a9d | 4720 | spin_unlock_irq(&ctx->completion_lock); |
405a5d2b XW |
4721 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4722 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
d7718a9d JA |
4723 | kfree(apoll); |
4724 | return false; | |
4725 | } | |
4726 | spin_unlock_irq(&ctx->completion_lock); | |
4727 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4728 | apoll->poll.events); | |
4729 | return true; | |
4730 | } | |
4731 | ||
4732 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4733 | struct io_poll_iocb *poll) | |
221c5eb2 | 4734 | { |
b41e9852 | 4735 | bool do_complete = false; |
221c5eb2 JA |
4736 | |
4737 | spin_lock(&poll->head->lock); | |
4738 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4739 | if (!list_empty(&poll->wait.entry)) { |
4740 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4741 | do_complete = true; |
221c5eb2 JA |
4742 | } |
4743 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4744 | hash_del(&req->hash_node); |
d7718a9d JA |
4745 | return do_complete; |
4746 | } | |
4747 | ||
4748 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4749 | { | |
4750 | bool do_complete; | |
4751 | ||
4752 | if (req->opcode == IORING_OP_POLL_ADD) { | |
18bceab1 | 4753 | io_poll_remove_double(req); |
d7718a9d JA |
4754 | do_complete = __io_poll_remove_one(req, &req->poll); |
4755 | } else { | |
3bfa5bcb JA |
4756 | struct async_poll *apoll = req->apoll; |
4757 | ||
d7718a9d | 4758 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4759 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4760 | if (do_complete) { | |
d7718a9d | 4761 | io_put_req(req); |
3bfa5bcb JA |
4762 | /* |
4763 | * restore ->work because we will call | |
4764 | * io_req_work_drop_env below when dropping the | |
4765 | * final reference. | |
4766 | */ | |
405a5d2b XW |
4767 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4768 | memcpy(&req->work, &apoll->work, | |
4769 | sizeof(req->work)); | |
3bfa5bcb JA |
4770 | kfree(apoll); |
4771 | } | |
b1f573bd XW |
4772 | } |
4773 | ||
b41e9852 JA |
4774 | if (do_complete) { |
4775 | io_cqring_fill_event(req, -ECANCELED); | |
4776 | io_commit_cqring(req->ctx); | |
4777 | req->flags |= REQ_F_COMP_LOCKED; | |
4778 | io_put_req(req); | |
4779 | } | |
4780 | ||
4781 | return do_complete; | |
221c5eb2 JA |
4782 | } |
4783 | ||
4784 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4785 | { | |
78076bb6 | 4786 | struct hlist_node *tmp; |
221c5eb2 | 4787 | struct io_kiocb *req; |
8e2e1faf | 4788 | int posted = 0, i; |
221c5eb2 JA |
4789 | |
4790 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4791 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4792 | struct hlist_head *list; | |
4793 | ||
4794 | list = &ctx->cancel_hash[i]; | |
4795 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4796 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4797 | } |
4798 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4799 | |
8e2e1faf JA |
4800 | if (posted) |
4801 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4802 | } |
4803 | ||
47f46768 JA |
4804 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4805 | { | |
78076bb6 | 4806 | struct hlist_head *list; |
47f46768 JA |
4807 | struct io_kiocb *req; |
4808 | ||
78076bb6 JA |
4809 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4810 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4811 | if (sqe_addr != req->user_data) |
4812 | continue; | |
4813 | if (io_poll_remove_one(req)) | |
eac406c6 | 4814 | return 0; |
b41e9852 | 4815 | return -EALREADY; |
47f46768 JA |
4816 | } |
4817 | ||
4818 | return -ENOENT; | |
4819 | } | |
4820 | ||
3529d8c2 JA |
4821 | static int io_poll_remove_prep(struct io_kiocb *req, |
4822 | const struct io_uring_sqe *sqe) | |
0969e783 | 4823 | { |
0969e783 JA |
4824 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4825 | return -EINVAL; | |
4826 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4827 | sqe->poll_events) | |
4828 | return -EINVAL; | |
4829 | ||
4830 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4831 | return 0; |
4832 | } | |
4833 | ||
221c5eb2 JA |
4834 | /* |
4835 | * Find a running poll command that matches one specified in sqe->addr, | |
4836 | * and remove it if found. | |
4837 | */ | |
fc4df999 | 4838 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4839 | { |
4840 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4841 | u64 addr; |
47f46768 | 4842 | int ret; |
221c5eb2 | 4843 | |
0969e783 | 4844 | addr = req->poll.addr; |
221c5eb2 | 4845 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4846 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4847 | spin_unlock_irq(&ctx->completion_lock); |
4848 | ||
4e88d6e7 JA |
4849 | if (ret < 0) |
4850 | req_set_fail_links(req); | |
e1e16097 | 4851 | io_req_complete(req, ret); |
221c5eb2 JA |
4852 | return 0; |
4853 | } | |
4854 | ||
221c5eb2 JA |
4855 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4856 | void *key) | |
4857 | { | |
c2f2eb7d JA |
4858 | struct io_kiocb *req = wait->private; |
4859 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4860 | |
d7718a9d | 4861 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4862 | } |
4863 | ||
221c5eb2 JA |
4864 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4865 | struct poll_table_struct *p) | |
4866 | { | |
4867 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4868 | ||
d7718a9d | 4869 | __io_queue_proc(&pt->req->poll, pt, head); |
eac406c6 JA |
4870 | } |
4871 | ||
3529d8c2 | 4872 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4873 | { |
4874 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 4875 | u32 events; |
221c5eb2 JA |
4876 | |
4877 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4878 | return -EINVAL; | |
4879 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4880 | return -EINVAL; | |
09bb8394 JA |
4881 | if (!poll->file) |
4882 | return -EBADF; | |
221c5eb2 | 4883 | |
5769a351 JX |
4884 | events = READ_ONCE(sqe->poll32_events); |
4885 | #ifdef __BIG_ENDIAN | |
4886 | events = swahw32(events); | |
4887 | #endif | |
a31eb4a2 JX |
4888 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
4889 | (events & EPOLLEXCLUSIVE); | |
b41e9852 | 4890 | |
4dd2824d | 4891 | io_get_req_task(req); |
0969e783 JA |
4892 | return 0; |
4893 | } | |
4894 | ||
014db007 | 4895 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4896 | { |
4897 | struct io_poll_iocb *poll = &req->poll; | |
4898 | struct io_ring_ctx *ctx = req->ctx; | |
4899 | struct io_poll_table ipt; | |
0969e783 | 4900 | __poll_t mask; |
0969e783 | 4901 | |
78076bb6 | 4902 | INIT_HLIST_NODE(&req->hash_node); |
36703247 | 4903 | INIT_LIST_HEAD(&req->list); |
d7718a9d | 4904 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4905 | |
d7718a9d JA |
4906 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4907 | io_poll_wake); | |
221c5eb2 | 4908 | |
8c838788 | 4909 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4910 | ipt.error = 0; |
b0dd8a41 | 4911 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4912 | } |
221c5eb2 JA |
4913 | spin_unlock_irq(&ctx->completion_lock); |
4914 | ||
8c838788 JA |
4915 | if (mask) { |
4916 | io_cqring_ev_posted(ctx); | |
014db007 | 4917 | io_put_req(req); |
221c5eb2 | 4918 | } |
8c838788 | 4919 | return ipt.error; |
221c5eb2 JA |
4920 | } |
4921 | ||
5262f567 JA |
4922 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4923 | { | |
ad8a48ac JA |
4924 | struct io_timeout_data *data = container_of(timer, |
4925 | struct io_timeout_data, timer); | |
4926 | struct io_kiocb *req = data->req; | |
4927 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4928 | unsigned long flags; |
4929 | ||
5262f567 JA |
4930 | atomic_inc(&ctx->cq_timeouts); |
4931 | ||
4932 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4933 | /* |
11365043 JA |
4934 | * We could be racing with timeout deletion. If the list is empty, |
4935 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4936 | */ |
bfe68a22 | 4937 | if (!list_empty(&req->list)) |
11365043 | 4938 | list_del_init(&req->list); |
5262f567 | 4939 | |
78e19bbe | 4940 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4941 | io_commit_cqring(ctx); |
4942 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4943 | ||
4944 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4945 | req_set_fail_links(req); |
5262f567 JA |
4946 | io_put_req(req); |
4947 | return HRTIMER_NORESTART; | |
4948 | } | |
4949 | ||
47f46768 JA |
4950 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
4951 | { | |
4952 | struct io_kiocb *req; | |
4953 | int ret = -ENOENT; | |
4954 | ||
4955 | list_for_each_entry(req, &ctx->timeout_list, list) { | |
4956 | if (user_data == req->user_data) { | |
4957 | list_del_init(&req->list); | |
4958 | ret = 0; | |
4959 | break; | |
4960 | } | |
4961 | } | |
4962 | ||
4963 | if (ret == -ENOENT) | |
4964 | return ret; | |
4965 | ||
2d28390a | 4966 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
4967 | if (ret == -1) |
4968 | return -EALREADY; | |
4969 | ||
4e88d6e7 | 4970 | req_set_fail_links(req); |
47f46768 JA |
4971 | io_cqring_fill_event(req, -ECANCELED); |
4972 | io_put_req(req); | |
4973 | return 0; | |
4974 | } | |
4975 | ||
3529d8c2 JA |
4976 | static int io_timeout_remove_prep(struct io_kiocb *req, |
4977 | const struct io_uring_sqe *sqe) | |
b29472ee | 4978 | { |
b29472ee JA |
4979 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4980 | return -EINVAL; | |
4981 | if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len) | |
4982 | return -EINVAL; | |
4983 | ||
4984 | req->timeout.addr = READ_ONCE(sqe->addr); | |
4985 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
4986 | if (req->timeout.flags) | |
4987 | return -EINVAL; | |
4988 | ||
b29472ee JA |
4989 | return 0; |
4990 | } | |
4991 | ||
11365043 JA |
4992 | /* |
4993 | * Remove or update an existing timeout command | |
4994 | */ | |
fc4df999 | 4995 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
4996 | { |
4997 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 4998 | int ret; |
11365043 | 4999 | |
11365043 | 5000 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5001 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5002 | |
47f46768 | 5003 | io_cqring_fill_event(req, ret); |
11365043 JA |
5004 | io_commit_cqring(ctx); |
5005 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5006 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5007 | if (ret < 0) |
5008 | req_set_fail_links(req); | |
ec9c02ad | 5009 | io_put_req(req); |
11365043 | 5010 | return 0; |
5262f567 JA |
5011 | } |
5012 | ||
3529d8c2 | 5013 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5014 | bool is_timeout_link) |
5262f567 | 5015 | { |
ad8a48ac | 5016 | struct io_timeout_data *data; |
a41525ab | 5017 | unsigned flags; |
56080b02 | 5018 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5019 | |
ad8a48ac | 5020 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5021 | return -EINVAL; |
ad8a48ac | 5022 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5023 | return -EINVAL; |
56080b02 | 5024 | if (off && is_timeout_link) |
2d28390a | 5025 | return -EINVAL; |
a41525ab JA |
5026 | flags = READ_ONCE(sqe->timeout_flags); |
5027 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5028 | return -EINVAL; |
bdf20073 | 5029 | |
bfe68a22 | 5030 | req->timeout.off = off; |
26a61679 | 5031 | |
3529d8c2 | 5032 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5033 | return -ENOMEM; |
5034 | ||
5035 | data = &req->io->timeout; | |
ad8a48ac | 5036 | data->req = req; |
ad8a48ac JA |
5037 | req->flags |= REQ_F_TIMEOUT; |
5038 | ||
5039 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5040 | return -EFAULT; |
5041 | ||
11365043 | 5042 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5043 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5044 | else |
ad8a48ac | 5045 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5046 | |
ad8a48ac JA |
5047 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5048 | return 0; | |
5049 | } | |
5050 | ||
fc4df999 | 5051 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5052 | { |
ad8a48ac | 5053 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5054 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5055 | struct list_head *entry; |
bfe68a22 | 5056 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5057 | |
733f5c95 | 5058 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5059 | |
5262f567 JA |
5060 | /* |
5061 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5062 | * timeout event to be satisfied. If it isn't set, then this is |
5063 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5064 | */ |
bfe68a22 | 5065 | if (!off) { |
93bd25bb | 5066 | req->flags |= REQ_F_TIMEOUT_NOSEQ; |
93bd25bb JA |
5067 | entry = ctx->timeout_list.prev; |
5068 | goto add; | |
5069 | } | |
5262f567 | 5070 | |
bfe68a22 PB |
5071 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5072 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5073 | |
5074 | /* | |
5075 | * Insertion sort, ensuring the first entry in the list is always | |
5076 | * the one we need first. | |
5077 | */ | |
5262f567 JA |
5078 | list_for_each_prev(entry, &ctx->timeout_list) { |
5079 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); | |
5262f567 | 5080 | |
93bd25bb JA |
5081 | if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) |
5082 | continue; | |
bfe68a22 PB |
5083 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5084 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5085 | break; |
5086 | } | |
93bd25bb | 5087 | add: |
5262f567 | 5088 | list_add(&req->list, entry); |
ad8a48ac JA |
5089 | data->timer.function = io_timeout_fn; |
5090 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5091 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5092 | return 0; |
5093 | } | |
5262f567 | 5094 | |
62755e35 JA |
5095 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5096 | { | |
5097 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5098 | ||
5099 | return req->user_data == (unsigned long) data; | |
5100 | } | |
5101 | ||
e977d6d3 | 5102 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5103 | { |
62755e35 | 5104 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5105 | int ret = 0; |
5106 | ||
4f26bda1 | 5107 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5108 | switch (cancel_ret) { |
5109 | case IO_WQ_CANCEL_OK: | |
5110 | ret = 0; | |
5111 | break; | |
5112 | case IO_WQ_CANCEL_RUNNING: | |
5113 | ret = -EALREADY; | |
5114 | break; | |
5115 | case IO_WQ_CANCEL_NOTFOUND: | |
5116 | ret = -ENOENT; | |
5117 | break; | |
5118 | } | |
5119 | ||
e977d6d3 JA |
5120 | return ret; |
5121 | } | |
5122 | ||
47f46768 JA |
5123 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5124 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5125 | int success_ret) |
47f46768 JA |
5126 | { |
5127 | unsigned long flags; | |
5128 | int ret; | |
5129 | ||
5130 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5131 | if (ret != -ENOENT) { | |
5132 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5133 | goto done; | |
5134 | } | |
5135 | ||
5136 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5137 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5138 | if (ret != -ENOENT) | |
5139 | goto done; | |
5140 | ret = io_poll_cancel(ctx, sqe_addr); | |
5141 | done: | |
b0dd8a41 JA |
5142 | if (!ret) |
5143 | ret = success_ret; | |
47f46768 JA |
5144 | io_cqring_fill_event(req, ret); |
5145 | io_commit_cqring(ctx); | |
5146 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5147 | io_cqring_ev_posted(ctx); | |
5148 | ||
4e88d6e7 JA |
5149 | if (ret < 0) |
5150 | req_set_fail_links(req); | |
014db007 | 5151 | io_put_req(req); |
47f46768 JA |
5152 | } |
5153 | ||
3529d8c2 JA |
5154 | static int io_async_cancel_prep(struct io_kiocb *req, |
5155 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5156 | { |
fbf23849 | 5157 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 JA |
5158 | return -EINVAL; |
5159 | if (sqe->flags || sqe->ioprio || sqe->off || sqe->len || | |
5160 | sqe->cancel_flags) | |
5161 | return -EINVAL; | |
5162 | ||
fbf23849 JA |
5163 | req->cancel.addr = READ_ONCE(sqe->addr); |
5164 | return 0; | |
5165 | } | |
5166 | ||
014db007 | 5167 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5168 | { |
5169 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5170 | |
014db007 | 5171 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5172 | return 0; |
5173 | } | |
5174 | ||
05f3fb3c JA |
5175 | static int io_files_update_prep(struct io_kiocb *req, |
5176 | const struct io_uring_sqe *sqe) | |
5177 | { | |
5178 | if (sqe->flags || sqe->ioprio || sqe->rw_flags) | |
5179 | return -EINVAL; | |
5180 | ||
5181 | req->files_update.offset = READ_ONCE(sqe->off); | |
5182 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5183 | if (!req->files_update.nr_args) | |
5184 | return -EINVAL; | |
5185 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5186 | return 0; | |
5187 | } | |
5188 | ||
229a7b63 JA |
5189 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5190 | struct io_comp_state *cs) | |
fbf23849 JA |
5191 | { |
5192 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5193 | struct io_uring_files_update up; |
5194 | int ret; | |
fbf23849 | 5195 | |
f86cd20c | 5196 | if (force_nonblock) |
05f3fb3c | 5197 | return -EAGAIN; |
05f3fb3c JA |
5198 | |
5199 | up.offset = req->files_update.offset; | |
5200 | up.fds = req->files_update.arg; | |
5201 | ||
5202 | mutex_lock(&ctx->uring_lock); | |
5203 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5204 | mutex_unlock(&ctx->uring_lock); | |
5205 | ||
5206 | if (ret < 0) | |
5207 | req_set_fail_links(req); | |
229a7b63 | 5208 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5209 | return 0; |
5210 | } | |
5211 | ||
3529d8c2 JA |
5212 | static int io_req_defer_prep(struct io_kiocb *req, |
5213 | const struct io_uring_sqe *sqe) | |
f67676d1 | 5214 | { |
e781573e | 5215 | ssize_t ret = 0; |
f67676d1 | 5216 | |
f1d96a8f PB |
5217 | if (!sqe) |
5218 | return 0; | |
5219 | ||
7cdaf587 XW |
5220 | io_req_init_async(req); |
5221 | ||
f86cd20c JA |
5222 | if (io_op_defs[req->opcode].file_table) { |
5223 | ret = io_grab_files(req); | |
5224 | if (unlikely(ret)) | |
5225 | return ret; | |
5226 | } | |
5227 | ||
cccf0ee8 JA |
5228 | io_req_work_grab_env(req, &io_op_defs[req->opcode]); |
5229 | ||
d625c6ee | 5230 | switch (req->opcode) { |
e781573e JA |
5231 | case IORING_OP_NOP: |
5232 | break; | |
f67676d1 JA |
5233 | case IORING_OP_READV: |
5234 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5235 | case IORING_OP_READ: |
3529d8c2 | 5236 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5237 | break; |
5238 | case IORING_OP_WRITEV: | |
5239 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5240 | case IORING_OP_WRITE: |
3529d8c2 | 5241 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5242 | break; |
0969e783 | 5243 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5244 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5245 | break; |
5246 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5247 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5248 | break; |
8ed8d3c3 | 5249 | case IORING_OP_FSYNC: |
3529d8c2 | 5250 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5251 | break; |
5252 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5253 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5254 | break; |
03b1230c | 5255 | case IORING_OP_SENDMSG: |
fddaface | 5256 | case IORING_OP_SEND: |
3529d8c2 | 5257 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5258 | break; |
5259 | case IORING_OP_RECVMSG: | |
fddaface | 5260 | case IORING_OP_RECV: |
3529d8c2 | 5261 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5262 | break; |
f499a021 | 5263 | case IORING_OP_CONNECT: |
3529d8c2 | 5264 | ret = io_connect_prep(req, sqe); |
f499a021 | 5265 | break; |
2d28390a | 5266 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5267 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5268 | break; |
b29472ee | 5269 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5270 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5271 | break; |
fbf23849 | 5272 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5273 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5274 | break; |
2d28390a | 5275 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5276 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5277 | break; |
8ed8d3c3 | 5278 | case IORING_OP_ACCEPT: |
3529d8c2 | 5279 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5280 | break; |
d63d1b5e JA |
5281 | case IORING_OP_FALLOCATE: |
5282 | ret = io_fallocate_prep(req, sqe); | |
5283 | break; | |
15b71abe JA |
5284 | case IORING_OP_OPENAT: |
5285 | ret = io_openat_prep(req, sqe); | |
5286 | break; | |
b5dba59e JA |
5287 | case IORING_OP_CLOSE: |
5288 | ret = io_close_prep(req, sqe); | |
5289 | break; | |
05f3fb3c JA |
5290 | case IORING_OP_FILES_UPDATE: |
5291 | ret = io_files_update_prep(req, sqe); | |
5292 | break; | |
eddc7ef5 JA |
5293 | case IORING_OP_STATX: |
5294 | ret = io_statx_prep(req, sqe); | |
5295 | break; | |
4840e418 JA |
5296 | case IORING_OP_FADVISE: |
5297 | ret = io_fadvise_prep(req, sqe); | |
5298 | break; | |
c1ca757b JA |
5299 | case IORING_OP_MADVISE: |
5300 | ret = io_madvise_prep(req, sqe); | |
5301 | break; | |
cebdb986 JA |
5302 | case IORING_OP_OPENAT2: |
5303 | ret = io_openat2_prep(req, sqe); | |
5304 | break; | |
3e4827b0 JA |
5305 | case IORING_OP_EPOLL_CTL: |
5306 | ret = io_epoll_ctl_prep(req, sqe); | |
5307 | break; | |
7d67af2c PB |
5308 | case IORING_OP_SPLICE: |
5309 | ret = io_splice_prep(req, sqe); | |
5310 | break; | |
ddf0322d JA |
5311 | case IORING_OP_PROVIDE_BUFFERS: |
5312 | ret = io_provide_buffers_prep(req, sqe); | |
5313 | break; | |
067524e9 JA |
5314 | case IORING_OP_REMOVE_BUFFERS: |
5315 | ret = io_remove_buffers_prep(req, sqe); | |
5316 | break; | |
f2a8d5c7 PB |
5317 | case IORING_OP_TEE: |
5318 | ret = io_tee_prep(req, sqe); | |
5319 | break; | |
f67676d1 | 5320 | default: |
e781573e JA |
5321 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5322 | req->opcode); | |
5323 | ret = -EINVAL; | |
b7bb4f7d | 5324 | break; |
f67676d1 JA |
5325 | } |
5326 | ||
b7bb4f7d | 5327 | return ret; |
f67676d1 JA |
5328 | } |
5329 | ||
3529d8c2 | 5330 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5331 | { |
a197f664 | 5332 | struct io_ring_ctx *ctx = req->ctx; |
f67676d1 | 5333 | int ret; |
de0617e4 | 5334 | |
9d858b21 | 5335 | /* Still need defer if there is pending req in defer list. */ |
4ee36314 | 5336 | if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list)) |
de0617e4 JA |
5337 | return 0; |
5338 | ||
650b5481 PB |
5339 | if (!req->io) { |
5340 | if (io_alloc_async_ctx(req)) | |
5341 | return -EAGAIN; | |
5342 | ret = io_req_defer_prep(req, sqe); | |
5343 | if (ret < 0) | |
5344 | return ret; | |
5345 | } | |
2d28390a | 5346 | |
de0617e4 | 5347 | spin_lock_irq(&ctx->completion_lock); |
9d858b21 | 5348 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5349 | spin_unlock_irq(&ctx->completion_lock); |
de0617e4 JA |
5350 | return 0; |
5351 | } | |
5352 | ||
915967f6 | 5353 | trace_io_uring_defer(ctx, req, req->user_data); |
de0617e4 JA |
5354 | list_add_tail(&req->list, &ctx->defer_list); |
5355 | spin_unlock_irq(&ctx->completion_lock); | |
5356 | return -EIOCBQUEUED; | |
5357 | } | |
5358 | ||
99bc4c38 PB |
5359 | static void io_cleanup_req(struct io_kiocb *req) |
5360 | { | |
5361 | struct io_async_ctx *io = req->io; | |
5362 | ||
5363 | switch (req->opcode) { | |
5364 | case IORING_OP_READV: | |
5365 | case IORING_OP_READ_FIXED: | |
5366 | case IORING_OP_READ: | |
bcda7baa JA |
5367 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5368 | kfree((void *)(unsigned long)req->rw.addr); | |
5369 | /* fallthrough */ | |
99bc4c38 PB |
5370 | case IORING_OP_WRITEV: |
5371 | case IORING_OP_WRITE_FIXED: | |
5372 | case IORING_OP_WRITE: | |
5373 | if (io->rw.iov != io->rw.fast_iov) | |
5374 | kfree(io->rw.iov); | |
5375 | break; | |
99bc4c38 | 5376 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5377 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5378 | kfree(req->sr_msg.kbuf); | |
5379 | /* fallthrough */ | |
5380 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5381 | if (io->msg.iov != io->msg.fast_iov) |
5382 | kfree(io->msg.iov); | |
5383 | break; | |
bcda7baa JA |
5384 | case IORING_OP_RECV: |
5385 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5386 | kfree(req->sr_msg.kbuf); | |
5387 | break; | |
8fef80bf PB |
5388 | case IORING_OP_OPENAT: |
5389 | case IORING_OP_OPENAT2: | |
8fef80bf | 5390 | break; |
7d67af2c | 5391 | case IORING_OP_SPLICE: |
f2a8d5c7 | 5392 | case IORING_OP_TEE: |
7d67af2c PB |
5393 | io_put_file(req, req->splice.file_in, |
5394 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5395 | break; | |
99bc4c38 PB |
5396 | } |
5397 | ||
5398 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5399 | } | |
5400 | ||
3529d8c2 | 5401 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5402 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5403 | { |
a197f664 | 5404 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5405 | int ret; |
2b188cc1 | 5406 | |
d625c6ee | 5407 | switch (req->opcode) { |
2b188cc1 | 5408 | case IORING_OP_NOP: |
229a7b63 | 5409 | ret = io_nop(req, cs); |
2b188cc1 JA |
5410 | break; |
5411 | case IORING_OP_READV: | |
edafccee | 5412 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5413 | case IORING_OP_READ: |
3529d8c2 JA |
5414 | if (sqe) { |
5415 | ret = io_read_prep(req, sqe, force_nonblock); | |
5416 | if (ret < 0) | |
5417 | break; | |
5418 | } | |
014db007 | 5419 | ret = io_read(req, force_nonblock); |
edafccee | 5420 | break; |
3529d8c2 | 5421 | case IORING_OP_WRITEV: |
edafccee | 5422 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5423 | case IORING_OP_WRITE: |
3529d8c2 JA |
5424 | if (sqe) { |
5425 | ret = io_write_prep(req, sqe, force_nonblock); | |
5426 | if (ret < 0) | |
5427 | break; | |
5428 | } | |
014db007 | 5429 | ret = io_write(req, force_nonblock); |
2b188cc1 | 5430 | break; |
c992fe29 | 5431 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5432 | if (sqe) { |
5433 | ret = io_prep_fsync(req, sqe); | |
5434 | if (ret < 0) | |
5435 | break; | |
5436 | } | |
014db007 | 5437 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5438 | break; |
221c5eb2 | 5439 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5440 | if (sqe) { |
5441 | ret = io_poll_add_prep(req, sqe); | |
5442 | if (ret) | |
5443 | break; | |
5444 | } | |
014db007 | 5445 | ret = io_poll_add(req); |
221c5eb2 JA |
5446 | break; |
5447 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5448 | if (sqe) { |
5449 | ret = io_poll_remove_prep(req, sqe); | |
5450 | if (ret < 0) | |
5451 | break; | |
5452 | } | |
fc4df999 | 5453 | ret = io_poll_remove(req); |
221c5eb2 | 5454 | break; |
5d17b4a4 | 5455 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5456 | if (sqe) { |
5457 | ret = io_prep_sfr(req, sqe); | |
5458 | if (ret < 0) | |
5459 | break; | |
5460 | } | |
014db007 | 5461 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5462 | break; |
0fa03c62 | 5463 | case IORING_OP_SENDMSG: |
fddaface | 5464 | case IORING_OP_SEND: |
3529d8c2 JA |
5465 | if (sqe) { |
5466 | ret = io_sendmsg_prep(req, sqe); | |
5467 | if (ret < 0) | |
5468 | break; | |
5469 | } | |
fddaface | 5470 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5471 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5472 | else |
229a7b63 | 5473 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5474 | break; |
aa1fa28f | 5475 | case IORING_OP_RECVMSG: |
fddaface | 5476 | case IORING_OP_RECV: |
3529d8c2 JA |
5477 | if (sqe) { |
5478 | ret = io_recvmsg_prep(req, sqe); | |
5479 | if (ret) | |
5480 | break; | |
5481 | } | |
fddaface | 5482 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5483 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5484 | else |
229a7b63 | 5485 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5486 | break; |
5262f567 | 5487 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5488 | if (sqe) { |
5489 | ret = io_timeout_prep(req, sqe, false); | |
5490 | if (ret) | |
5491 | break; | |
5492 | } | |
fc4df999 | 5493 | ret = io_timeout(req); |
5262f567 | 5494 | break; |
11365043 | 5495 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5496 | if (sqe) { |
5497 | ret = io_timeout_remove_prep(req, sqe); | |
5498 | if (ret) | |
5499 | break; | |
5500 | } | |
fc4df999 | 5501 | ret = io_timeout_remove(req); |
11365043 | 5502 | break; |
17f2fe35 | 5503 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5504 | if (sqe) { |
5505 | ret = io_accept_prep(req, sqe); | |
5506 | if (ret) | |
5507 | break; | |
5508 | } | |
229a7b63 | 5509 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5510 | break; |
f8e85cf2 | 5511 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5512 | if (sqe) { |
5513 | ret = io_connect_prep(req, sqe); | |
5514 | if (ret) | |
5515 | break; | |
5516 | } | |
229a7b63 | 5517 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5518 | break; |
62755e35 | 5519 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5520 | if (sqe) { |
5521 | ret = io_async_cancel_prep(req, sqe); | |
5522 | if (ret) | |
5523 | break; | |
5524 | } | |
014db007 | 5525 | ret = io_async_cancel(req); |
62755e35 | 5526 | break; |
d63d1b5e JA |
5527 | case IORING_OP_FALLOCATE: |
5528 | if (sqe) { | |
5529 | ret = io_fallocate_prep(req, sqe); | |
5530 | if (ret) | |
5531 | break; | |
5532 | } | |
014db007 | 5533 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5534 | break; |
15b71abe JA |
5535 | case IORING_OP_OPENAT: |
5536 | if (sqe) { | |
5537 | ret = io_openat_prep(req, sqe); | |
5538 | if (ret) | |
5539 | break; | |
5540 | } | |
014db007 | 5541 | ret = io_openat(req, force_nonblock); |
15b71abe | 5542 | break; |
b5dba59e JA |
5543 | case IORING_OP_CLOSE: |
5544 | if (sqe) { | |
5545 | ret = io_close_prep(req, sqe); | |
5546 | if (ret) | |
5547 | break; | |
5548 | } | |
229a7b63 | 5549 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5550 | break; |
05f3fb3c JA |
5551 | case IORING_OP_FILES_UPDATE: |
5552 | if (sqe) { | |
5553 | ret = io_files_update_prep(req, sqe); | |
5554 | if (ret) | |
5555 | break; | |
5556 | } | |
229a7b63 | 5557 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5558 | break; |
eddc7ef5 JA |
5559 | case IORING_OP_STATX: |
5560 | if (sqe) { | |
5561 | ret = io_statx_prep(req, sqe); | |
5562 | if (ret) | |
5563 | break; | |
5564 | } | |
014db007 | 5565 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5566 | break; |
4840e418 JA |
5567 | case IORING_OP_FADVISE: |
5568 | if (sqe) { | |
5569 | ret = io_fadvise_prep(req, sqe); | |
5570 | if (ret) | |
5571 | break; | |
5572 | } | |
014db007 | 5573 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5574 | break; |
c1ca757b JA |
5575 | case IORING_OP_MADVISE: |
5576 | if (sqe) { | |
5577 | ret = io_madvise_prep(req, sqe); | |
5578 | if (ret) | |
5579 | break; | |
5580 | } | |
014db007 | 5581 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5582 | break; |
cebdb986 JA |
5583 | case IORING_OP_OPENAT2: |
5584 | if (sqe) { | |
5585 | ret = io_openat2_prep(req, sqe); | |
5586 | if (ret) | |
5587 | break; | |
5588 | } | |
014db007 | 5589 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5590 | break; |
3e4827b0 JA |
5591 | case IORING_OP_EPOLL_CTL: |
5592 | if (sqe) { | |
5593 | ret = io_epoll_ctl_prep(req, sqe); | |
5594 | if (ret) | |
5595 | break; | |
5596 | } | |
229a7b63 | 5597 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5598 | break; |
7d67af2c PB |
5599 | case IORING_OP_SPLICE: |
5600 | if (sqe) { | |
5601 | ret = io_splice_prep(req, sqe); | |
5602 | if (ret < 0) | |
5603 | break; | |
5604 | } | |
014db007 | 5605 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5606 | break; |
ddf0322d JA |
5607 | case IORING_OP_PROVIDE_BUFFERS: |
5608 | if (sqe) { | |
5609 | ret = io_provide_buffers_prep(req, sqe); | |
5610 | if (ret) | |
5611 | break; | |
5612 | } | |
229a7b63 | 5613 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5614 | break; |
067524e9 JA |
5615 | case IORING_OP_REMOVE_BUFFERS: |
5616 | if (sqe) { | |
5617 | ret = io_remove_buffers_prep(req, sqe); | |
5618 | if (ret) | |
5619 | break; | |
5620 | } | |
229a7b63 | 5621 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5622 | break; |
f2a8d5c7 PB |
5623 | case IORING_OP_TEE: |
5624 | if (sqe) { | |
5625 | ret = io_tee_prep(req, sqe); | |
5626 | if (ret < 0) | |
5627 | break; | |
5628 | } | |
5629 | ret = io_tee(req, force_nonblock); | |
5630 | break; | |
2b188cc1 JA |
5631 | default: |
5632 | ret = -EINVAL; | |
5633 | break; | |
5634 | } | |
5635 | ||
def596e9 JA |
5636 | if (ret) |
5637 | return ret; | |
5638 | ||
b532576e JA |
5639 | /* If the op doesn't have a file, we're not polling for it */ |
5640 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5641 | const bool in_async = io_wq_current_is_worker(); |
5642 | ||
9e645e11 | 5643 | if (req->result == -EAGAIN) |
def596e9 JA |
5644 | return -EAGAIN; |
5645 | ||
11ba820b JA |
5646 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5647 | if (in_async) | |
5648 | mutex_lock(&ctx->uring_lock); | |
5649 | ||
def596e9 | 5650 | io_iopoll_req_issued(req); |
11ba820b JA |
5651 | |
5652 | if (in_async) | |
5653 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5654 | } |
5655 | ||
5656 | return 0; | |
2b188cc1 JA |
5657 | } |
5658 | ||
d4c81f38 PB |
5659 | static void io_arm_async_linked_timeout(struct io_kiocb *req) |
5660 | { | |
5661 | struct io_kiocb *link; | |
5662 | ||
5663 | /* link head's timeout is queued in io_queue_async_work() */ | |
5664 | if (!(req->flags & REQ_F_QUEUE_TIMEOUT)) | |
5665 | return; | |
5666 | ||
5667 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); | |
5668 | io_queue_linked_timeout(link); | |
5669 | } | |
5670 | ||
561fb04a | 5671 | static void io_wq_submit_work(struct io_wq_work **workptr) |
2b188cc1 | 5672 | { |
561fb04a | 5673 | struct io_wq_work *work = *workptr; |
2b188cc1 | 5674 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
561fb04a | 5675 | int ret = 0; |
2b188cc1 | 5676 | |
d4c81f38 PB |
5677 | io_arm_async_linked_timeout(req); |
5678 | ||
0c9d5ccd JA |
5679 | /* if NO_CANCEL is set, we must still run the work */ |
5680 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5681 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5682 | ret = -ECANCELED; |
0c9d5ccd | 5683 | } |
31b51510 | 5684 | |
561fb04a | 5685 | if (!ret) { |
561fb04a | 5686 | do { |
f13fad7b | 5687 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
5688 | /* |
5689 | * We can get EAGAIN for polled IO even though we're | |
5690 | * forcing a sync submission from here, since we can't | |
5691 | * wait for request slots on the block side. | |
5692 | */ | |
5693 | if (ret != -EAGAIN) | |
5694 | break; | |
5695 | cond_resched(); | |
5696 | } while (1); | |
5697 | } | |
31b51510 | 5698 | |
561fb04a | 5699 | if (ret) { |
4e88d6e7 | 5700 | req_set_fail_links(req); |
e1e16097 | 5701 | io_req_complete(req, ret); |
edafccee | 5702 | } |
2b188cc1 | 5703 | |
e9fd9396 | 5704 | io_steal_work(req, workptr); |
2b188cc1 JA |
5705 | } |
5706 | ||
65e19f54 JA |
5707 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5708 | int index) | |
5709 | { | |
5710 | struct fixed_file_table *table; | |
5711 | ||
05f3fb3c | 5712 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5713 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5714 | } |
5715 | ||
8da11c19 PB |
5716 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5717 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5718 | { |
a197f664 | 5719 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5720 | struct file *file; |
09bb8394 | 5721 | |
8da11c19 | 5722 | if (fixed) { |
05f3fb3c | 5723 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5724 | (unsigned) fd >= ctx->nr_user_files)) |
5725 | return -EBADF; | |
b7620121 | 5726 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5727 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5728 | if (file) { |
5729 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5730 | percpu_ref_get(req->fixed_file_refs); | |
5731 | } | |
09bb8394 | 5732 | } else { |
c826bd7a | 5733 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5734 | file = __io_file_get(state, fd); |
09bb8394 JA |
5735 | } |
5736 | ||
fd2206e4 JA |
5737 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5738 | *out_file = file; | |
5739 | return 0; | |
5740 | } | |
5741 | return -EBADF; | |
09bb8394 JA |
5742 | } |
5743 | ||
8da11c19 | 5744 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5745 | int fd) |
8da11c19 | 5746 | { |
8da11c19 PB |
5747 | bool fixed; |
5748 | ||
63ff8223 | 5749 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5750 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5751 | return -EBADF; |
5752 | ||
5753 | return io_file_get(state, req, fd, &req->file, fixed); | |
5754 | } | |
5755 | ||
a197f664 | 5756 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5757 | { |
5758 | int ret = -EBADF; | |
a197f664 | 5759 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5760 | |
5b0bbee4 | 5761 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5762 | return 0; |
b14cca0c | 5763 | if (!ctx->ring_file) |
b5dba59e JA |
5764 | return -EBADF; |
5765 | ||
fcb323cc JA |
5766 | rcu_read_lock(); |
5767 | spin_lock_irq(&ctx->inflight_lock); | |
5768 | /* | |
5769 | * We use the f_ops->flush() handler to ensure that we can flush | |
5770 | * out work accessing these files if the fd is closed. Check if | |
5771 | * the fd has changed since we started down this path, and disallow | |
5772 | * this operation if it has. | |
5773 | */ | |
b14cca0c | 5774 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5775 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5776 | req->flags |= REQ_F_INFLIGHT; | |
5777 | req->work.files = current->files; | |
5778 | ret = 0; | |
5779 | } | |
5780 | spin_unlock_irq(&ctx->inflight_lock); | |
5781 | rcu_read_unlock(); | |
5782 | ||
5783 | return ret; | |
5784 | } | |
5785 | ||
2665abfd | 5786 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5787 | { |
ad8a48ac JA |
5788 | struct io_timeout_data *data = container_of(timer, |
5789 | struct io_timeout_data, timer); | |
5790 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5791 | struct io_ring_ctx *ctx = req->ctx; |
5792 | struct io_kiocb *prev = NULL; | |
5793 | unsigned long flags; | |
2665abfd JA |
5794 | |
5795 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5796 | ||
5797 | /* | |
5798 | * We don't expect the list to be empty, that will only happen if we | |
5799 | * race with the completion of the linked work. | |
5800 | */ | |
4493233e PB |
5801 | if (!list_empty(&req->link_list)) { |
5802 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5803 | link_list); | |
5d960724 | 5804 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5805 | list_del_init(&req->link_list); |
5d960724 JA |
5806 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5807 | } else | |
76a46e06 | 5808 | prev = NULL; |
2665abfd JA |
5809 | } |
5810 | ||
5811 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5812 | ||
5813 | if (prev) { | |
4e88d6e7 | 5814 | req_set_fail_links(prev); |
014db007 | 5815 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5816 | io_put_req(prev); |
47f46768 | 5817 | } else { |
e1e16097 | 5818 | io_req_complete(req, -ETIME); |
2665abfd | 5819 | } |
2665abfd JA |
5820 | return HRTIMER_NORESTART; |
5821 | } | |
5822 | ||
ad8a48ac | 5823 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5824 | { |
76a46e06 | 5825 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5826 | |
76a46e06 JA |
5827 | /* |
5828 | * If the list is now empty, then our linked request finished before | |
5829 | * we got a chance to setup the timer | |
5830 | */ | |
5831 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5832 | if (!list_empty(&req->link_list)) { |
2d28390a | 5833 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5834 | |
ad8a48ac JA |
5835 | data->timer.function = io_link_timeout_fn; |
5836 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5837 | data->mode); | |
2665abfd | 5838 | } |
76a46e06 | 5839 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5840 | |
2665abfd | 5841 | /* drop submission reference */ |
76a46e06 JA |
5842 | io_put_req(req); |
5843 | } | |
2665abfd | 5844 | |
ad8a48ac | 5845 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5846 | { |
5847 | struct io_kiocb *nxt; | |
5848 | ||
dea3b49c | 5849 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 5850 | return NULL; |
d7718a9d JA |
5851 | /* for polled retry, if flag is set, we already went through here */ |
5852 | if (req->flags & REQ_F_POLLED) | |
5853 | return NULL; | |
2665abfd | 5854 | |
4493233e PB |
5855 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5856 | link_list); | |
d625c6ee | 5857 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5858 | return NULL; |
2665abfd | 5859 | |
76a46e06 | 5860 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5861 | return nxt; |
2665abfd JA |
5862 | } |
5863 | ||
f13fad7b JA |
5864 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
5865 | struct io_comp_state *cs) | |
2b188cc1 | 5866 | { |
4a0a7a18 | 5867 | struct io_kiocb *linked_timeout; |
4bc4494e | 5868 | struct io_kiocb *nxt; |
193155c8 | 5869 | const struct cred *old_creds = NULL; |
e0c5c576 | 5870 | int ret; |
2b188cc1 | 5871 | |
4a0a7a18 JA |
5872 | again: |
5873 | linked_timeout = io_prep_linked_timeout(req); | |
5874 | ||
7cdaf587 XW |
5875 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
5876 | req->work.creds != current_cred()) { | |
193155c8 JA |
5877 | if (old_creds) |
5878 | revert_creds(old_creds); | |
5879 | if (old_creds == req->work.creds) | |
5880 | old_creds = NULL; /* restored original creds */ | |
5881 | else | |
5882 | old_creds = override_creds(req->work.creds); | |
5883 | } | |
5884 | ||
f13fad7b | 5885 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
5886 | |
5887 | /* | |
5888 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5889 | * doesn't support non-blocking read/write attempts | |
5890 | */ | |
24c74678 | 5891 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d7718a9d JA |
5892 | if (io_arm_poll_handler(req)) { |
5893 | if (linked_timeout) | |
5894 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5895 | goto exit; |
d7718a9d | 5896 | } |
86a761f8 | 5897 | punt: |
7cdaf587 XW |
5898 | io_req_init_async(req); |
5899 | ||
f86cd20c | 5900 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5901 | ret = io_grab_files(req); |
5902 | if (ret) | |
5903 | goto err; | |
2b188cc1 | 5904 | } |
bbad27b2 PB |
5905 | |
5906 | /* | |
5907 | * Queued up for async execution, worker will release | |
5908 | * submit reference when the iocb is actually submitted. | |
5909 | */ | |
5910 | io_queue_async_work(req); | |
4bc4494e | 5911 | goto exit; |
2b188cc1 | 5912 | } |
e65ef56d | 5913 | |
fcb323cc | 5914 | err: |
4bc4494e | 5915 | nxt = NULL; |
76a46e06 | 5916 | /* drop submission reference */ |
2a44f467 | 5917 | io_put_req_find_next(req, &nxt); |
e65ef56d | 5918 | |
f9bd67f6 | 5919 | if (linked_timeout) { |
76a46e06 | 5920 | if (!ret) |
f9bd67f6 | 5921 | io_queue_linked_timeout(linked_timeout); |
76a46e06 | 5922 | else |
f9bd67f6 | 5923 | io_put_req(linked_timeout); |
76a46e06 JA |
5924 | } |
5925 | ||
e65ef56d | 5926 | /* and drop final reference, if we failed */ |
9e645e11 | 5927 | if (ret) { |
4e88d6e7 | 5928 | req_set_fail_links(req); |
e1e16097 | 5929 | io_req_complete(req, ret); |
9e645e11 | 5930 | } |
4a0a7a18 JA |
5931 | if (nxt) { |
5932 | req = nxt; | |
86a761f8 PB |
5933 | |
5934 | if (req->flags & REQ_F_FORCE_ASYNC) | |
5935 | goto punt; | |
4a0a7a18 JA |
5936 | goto again; |
5937 | } | |
4bc4494e | 5938 | exit: |
193155c8 JA |
5939 | if (old_creds) |
5940 | revert_creds(old_creds); | |
2b188cc1 JA |
5941 | } |
5942 | ||
f13fad7b JA |
5943 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
5944 | struct io_comp_state *cs) | |
4fe2c963 JL |
5945 | { |
5946 | int ret; | |
5947 | ||
3529d8c2 | 5948 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
5949 | if (ret) { |
5950 | if (ret != -EIOCBQUEUED) { | |
1118591a | 5951 | fail_req: |
4e88d6e7 | 5952 | req_set_fail_links(req); |
e1e16097 JA |
5953 | io_put_req(req); |
5954 | io_req_complete(req, ret); | |
4fe2c963 | 5955 | } |
2550878f | 5956 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a PB |
5957 | if (!req->io) { |
5958 | ret = -EAGAIN; | |
5959 | if (io_alloc_async_ctx(req)) | |
5960 | goto fail_req; | |
5961 | ret = io_req_defer_prep(req, sqe); | |
5962 | if (unlikely(ret < 0)) | |
5963 | goto fail_req; | |
5964 | } | |
5965 | ||
ce35a47a JA |
5966 | /* |
5967 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
5968 | * to async execution. | |
5969 | */ | |
5970 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
5971 | io_queue_async_work(req); | |
5972 | } else { | |
f13fad7b | 5973 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 5974 | } |
4fe2c963 JL |
5975 | } |
5976 | ||
f13fad7b JA |
5977 | static inline void io_queue_link_head(struct io_kiocb *req, |
5978 | struct io_comp_state *cs) | |
4fe2c963 | 5979 | { |
94ae5e77 | 5980 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
5981 | io_put_req(req); |
5982 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 5983 | } else |
f13fad7b | 5984 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
5985 | } |
5986 | ||
1d4240cc | 5987 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5988 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 5989 | { |
a197f664 | 5990 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 5991 | int ret; |
9e645e11 | 5992 | |
9e645e11 JA |
5993 | /* |
5994 | * If we already have a head request, queue this one for async | |
5995 | * submittal once the head completes. If we don't have a head but | |
5996 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
5997 | * submitted sync once the chain is complete. If none of those | |
5998 | * conditions are true (normal request), then just queue it. | |
5999 | */ | |
6000 | if (*link) { | |
9d76377f | 6001 | struct io_kiocb *head = *link; |
4e88d6e7 | 6002 | |
8cdf2193 PB |
6003 | /* |
6004 | * Taking sequential execution of a link, draining both sides | |
6005 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6006 | * requests in the link. So, it drains the head and the | |
6007 | * next after the link request. The last one is done via | |
6008 | * drain_next flag to persist the effect across calls. | |
6009 | */ | |
ef4ff581 | 6010 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6011 | head->flags |= REQ_F_IO_DRAIN; |
6012 | ctx->drain_next = 1; | |
6013 | } | |
1d4240cc PB |
6014 | if (io_alloc_async_ctx(req)) |
6015 | return -EAGAIN; | |
9e645e11 | 6016 | |
3529d8c2 | 6017 | ret = io_req_defer_prep(req, sqe); |
2d28390a | 6018 | if (ret) { |
4e88d6e7 | 6019 | /* fail even hard links since we don't submit */ |
9d76377f | 6020 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6021 | return ret; |
2d28390a | 6022 | } |
9d76377f PB |
6023 | trace_io_uring_link(ctx, req, head); |
6024 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
6025 | |
6026 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6027 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6028 | io_queue_link_head(head, cs); |
32fe525b PB |
6029 | *link = NULL; |
6030 | } | |
9e645e11 | 6031 | } else { |
711be031 PB |
6032 | if (unlikely(ctx->drain_next)) { |
6033 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6034 | ctx->drain_next = 0; |
711be031 | 6035 | } |
ef4ff581 | 6036 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6037 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6038 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6039 | |
1d4240cc PB |
6040 | if (io_alloc_async_ctx(req)) |
6041 | return -EAGAIN; | |
6042 | ||
711be031 PB |
6043 | ret = io_req_defer_prep(req, sqe); |
6044 | if (ret) | |
6045 | req->flags |= REQ_F_FAIL_LINK; | |
6046 | *link = req; | |
6047 | } else { | |
f13fad7b | 6048 | io_queue_sqe(req, sqe, cs); |
711be031 | 6049 | } |
9e645e11 | 6050 | } |
2e6e1fde | 6051 | |
1d4240cc | 6052 | return 0; |
9e645e11 JA |
6053 | } |
6054 | ||
9a56a232 JA |
6055 | /* |
6056 | * Batched submission is done, ensure local IO is flushed out. | |
6057 | */ | |
6058 | static void io_submit_state_end(struct io_submit_state *state) | |
6059 | { | |
f13fad7b JA |
6060 | if (!list_empty(&state->comp.list)) |
6061 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6062 | blk_finish_plug(&state->plug); |
9f13c35b | 6063 | io_state_file_put(state); |
2579f913 | 6064 | if (state->free_reqs) |
6c8a3134 | 6065 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6066 | } |
6067 | ||
6068 | /* | |
6069 | * Start submission side cache. | |
6070 | */ | |
6071 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6072 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6073 | { |
6074 | blk_start_plug(&state->plug); | |
b63534c4 JA |
6075 | #ifdef CONFIG_BLOCK |
6076 | state->plug.nowait = true; | |
6077 | #endif | |
013538bd JA |
6078 | state->comp.nr = 0; |
6079 | INIT_LIST_HEAD(&state->comp.list); | |
6080 | state->comp.ctx = ctx; | |
2579f913 | 6081 | state->free_reqs = 0; |
9a56a232 JA |
6082 | state->file = NULL; |
6083 | state->ios_left = max_ios; | |
6084 | } | |
6085 | ||
2b188cc1 JA |
6086 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6087 | { | |
75b28aff | 6088 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6089 | |
caf582c6 PB |
6090 | /* |
6091 | * Ensure any loads from the SQEs are done at this point, | |
6092 | * since once we write the new head, the application could | |
6093 | * write new data to them. | |
6094 | */ | |
6095 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6096 | } |
6097 | ||
2b188cc1 | 6098 | /* |
3529d8c2 | 6099 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6100 | * that is mapped by userspace. This means that care needs to be taken to |
6101 | * ensure that reads are stable, as we cannot rely on userspace always | |
6102 | * being a good citizen. If members of the sqe are validated and then later | |
6103 | * used, it's important that those reads are done through READ_ONCE() to | |
6104 | * prevent a re-load down the line. | |
6105 | */ | |
709b302f | 6106 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6107 | { |
75b28aff | 6108 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6109 | unsigned head; |
6110 | ||
6111 | /* | |
6112 | * The cached sq head (or cq tail) serves two purposes: | |
6113 | * | |
6114 | * 1) allows us to batch the cost of updating the user visible | |
6115 | * head updates. | |
6116 | * 2) allows the kernel side to track the head on its own, even | |
6117 | * though the application is the one updating it. | |
6118 | */ | |
ee7d46d9 | 6119 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6120 | if (likely(head < ctx->sq_entries)) |
6121 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6122 | |
6123 | /* drop invalid entries */ | |
498ccd9e | 6124 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6125 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6126 | return NULL; |
6127 | } | |
6128 | ||
6129 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6130 | { | |
6131 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6132 | } |
6133 | ||
ef4ff581 PB |
6134 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6135 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6136 | IOSQE_BUFFER_SELECT) | |
6137 | ||
6138 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6139 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6140 | struct io_submit_state *state) |
0553b8bd | 6141 | { |
ef4ff581 | 6142 | unsigned int sqe_flags; |
63ff8223 | 6143 | int id; |
ef4ff581 | 6144 | |
0553b8bd PB |
6145 | /* |
6146 | * All io need record the previous position, if LINK vs DARIN, | |
6147 | * it can be used to mark the position of the first IO in the | |
6148 | * link list. | |
6149 | */ | |
31af27c7 | 6150 | req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped; |
0553b8bd PB |
6151 | req->opcode = READ_ONCE(sqe->opcode); |
6152 | req->user_data = READ_ONCE(sqe->user_data); | |
6153 | req->io = NULL; | |
6154 | req->file = NULL; | |
6155 | req->ctx = ctx; | |
6156 | req->flags = 0; | |
6157 | /* one is dropped after submission, the other at completion */ | |
6158 | refcount_set(&req->refs, 2); | |
4dd2824d | 6159 | req->task = current; |
0553b8bd | 6160 | req->result = 0; |
ef4ff581 PB |
6161 | |
6162 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6163 | return -EINVAL; | |
6164 | ||
9d8426a0 JA |
6165 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6166 | return -EFAULT; | |
ef4ff581 PB |
6167 | |
6168 | sqe_flags = READ_ONCE(sqe->flags); | |
6169 | /* enforce forwards compatibility on users */ | |
6170 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6171 | return -EINVAL; | |
6172 | ||
6173 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6174 | !io_op_defs[req->opcode].buffer_select) | |
6175 | return -EOPNOTSUPP; | |
6176 | ||
6177 | id = READ_ONCE(sqe->personality); | |
6178 | if (id) { | |
7cdaf587 | 6179 | io_req_init_async(req); |
ef4ff581 PB |
6180 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6181 | if (unlikely(!req->work.creds)) | |
6182 | return -EINVAL; | |
6183 | get_cred(req->work.creds); | |
6184 | } | |
6185 | ||
6186 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6187 | req->flags |= sqe_flags; |
ef4ff581 | 6188 | |
63ff8223 JA |
6189 | if (!io_op_defs[req->opcode].needs_file) |
6190 | return 0; | |
6191 | ||
6192 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6193 | } |
6194 | ||
fb5ccc98 | 6195 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 6196 | struct file *ring_file, int ring_fd) |
6c271ce2 | 6197 | { |
ac8691c4 | 6198 | struct io_submit_state state; |
9e645e11 | 6199 | struct io_kiocb *link = NULL; |
9e645e11 | 6200 | int i, submitted = 0; |
6c271ce2 | 6201 | |
c4a2ed72 | 6202 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6203 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6204 | if (!list_empty(&ctx->cq_overflow_list) && | |
6205 | !io_cqring_overflow_flush(ctx, false)) | |
6206 | return -EBUSY; | |
6207 | } | |
6c271ce2 | 6208 | |
ee7d46d9 PB |
6209 | /* make sure SQ entry isn't read before tail */ |
6210 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6211 | |
2b85edfc PB |
6212 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6213 | return -EAGAIN; | |
6c271ce2 | 6214 | |
013538bd | 6215 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 | 6216 | |
b14cca0c PB |
6217 | ctx->ring_fd = ring_fd; |
6218 | ctx->ring_file = ring_file; | |
6219 | ||
6c271ce2 | 6220 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6221 | const struct io_uring_sqe *sqe; |
196be95c | 6222 | struct io_kiocb *req; |
1cb1edb2 | 6223 | int err; |
fb5ccc98 | 6224 | |
b1e50e54 PB |
6225 | sqe = io_get_sqe(ctx); |
6226 | if (unlikely(!sqe)) { | |
6227 | io_consume_sqe(ctx); | |
6228 | break; | |
6229 | } | |
ac8691c4 | 6230 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6231 | if (unlikely(!req)) { |
6232 | if (!submitted) | |
6233 | submitted = -EAGAIN; | |
fb5ccc98 | 6234 | break; |
196be95c | 6235 | } |
fb5ccc98 | 6236 | |
ac8691c4 | 6237 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6238 | io_consume_sqe(ctx); |
d3656344 JA |
6239 | /* will complete beyond this point, count as submitted */ |
6240 | submitted++; | |
6241 | ||
ef4ff581 | 6242 | if (unlikely(err)) { |
1cb1edb2 | 6243 | fail_req: |
e1e16097 JA |
6244 | io_put_req(req); |
6245 | io_req_complete(req, err); | |
196be95c PB |
6246 | break; |
6247 | } | |
fb5ccc98 | 6248 | |
354420f7 | 6249 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6250 | true, io_async_submit(ctx)); |
f13fad7b | 6251 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6252 | if (err) |
6253 | goto fail_req; | |
6c271ce2 JA |
6254 | } |
6255 | ||
9466f437 PB |
6256 | if (unlikely(submitted != nr)) { |
6257 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6258 | ||
6259 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6260 | } | |
9e645e11 | 6261 | if (link) |
f13fad7b | 6262 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6263 | io_submit_state_end(&state); |
6c271ce2 | 6264 | |
ae9428ca PB |
6265 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6266 | io_commit_sqring(ctx); | |
6267 | ||
6c271ce2 JA |
6268 | return submitted; |
6269 | } | |
6270 | ||
6271 | static int io_sq_thread(void *data) | |
6272 | { | |
6c271ce2 | 6273 | struct io_ring_ctx *ctx = data; |
181e448d | 6274 | const struct cred *old_cred; |
6c271ce2 | 6275 | DEFINE_WAIT(wait); |
6c271ce2 | 6276 | unsigned long timeout; |
bdcd3eab | 6277 | int ret = 0; |
6c271ce2 | 6278 | |
0f158b4c | 6279 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6280 | |
181e448d | 6281 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6282 | |
bdcd3eab | 6283 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6284 | while (!kthread_should_park()) { |
fb5ccc98 | 6285 | unsigned int to_submit; |
6c271ce2 | 6286 | |
bdcd3eab | 6287 | if (!list_empty(&ctx->poll_list)) { |
6c271ce2 JA |
6288 | unsigned nr_events = 0; |
6289 | ||
bdcd3eab XW |
6290 | mutex_lock(&ctx->uring_lock); |
6291 | if (!list_empty(&ctx->poll_list)) | |
6292 | io_iopoll_getevents(ctx, &nr_events, 0); | |
6293 | else | |
6c271ce2 | 6294 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6295 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6296 | } |
6297 | ||
fb5ccc98 | 6298 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6299 | |
6300 | /* | |
6301 | * If submit got -EBUSY, flag us as needing the application | |
6302 | * to enter the kernel to reap and flush events. | |
6303 | */ | |
6304 | if (!to_submit || ret == -EBUSY) { | |
7143b5ac SG |
6305 | /* |
6306 | * Drop cur_mm before scheduling, we can't hold it for | |
6307 | * long periods (or over schedule()). Do this before | |
6308 | * adding ourselves to the waitqueue, as the unuse/drop | |
6309 | * may sleep. | |
6310 | */ | |
bf9c2f1c | 6311 | io_sq_thread_drop_mm(ctx); |
7143b5ac | 6312 | |
6c271ce2 JA |
6313 | /* |
6314 | * We're polling. If we're within the defined idle | |
6315 | * period, then let us spin without work before going | |
c1edbf5f JA |
6316 | * to sleep. The exception is if we got EBUSY doing |
6317 | * more IO, we should wait for the application to | |
6318 | * reap events and wake us up. | |
6c271ce2 | 6319 | */ |
bdcd3eab | 6320 | if (!list_empty(&ctx->poll_list) || |
df069d80 JA |
6321 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6322 | !percpu_ref_is_dying(&ctx->refs))) { | |
b41e9852 JA |
6323 | if (current->task_works) |
6324 | task_work_run(); | |
9831a90c | 6325 | cond_resched(); |
6c271ce2 JA |
6326 | continue; |
6327 | } | |
6328 | ||
6c271ce2 JA |
6329 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6330 | TASK_INTERRUPTIBLE); | |
6331 | ||
bdcd3eab XW |
6332 | /* |
6333 | * While doing polled IO, before going to sleep, we need | |
6334 | * to check if there are new reqs added to poll_list, it | |
6335 | * is because reqs may have been punted to io worker and | |
6336 | * will be added to poll_list later, hence check the | |
6337 | * poll_list again. | |
6338 | */ | |
6339 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6340 | !list_empty_careful(&ctx->poll_list)) { | |
6341 | finish_wait(&ctx->sqo_wait, &wait); | |
6342 | continue; | |
6343 | } | |
6344 | ||
6c271ce2 | 6345 | /* Tell userspace we may need a wakeup call */ |
75b28aff | 6346 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
0d7bae69 SB |
6347 | /* make sure to read SQ tail after writing flags */ |
6348 | smp_mb(); | |
6c271ce2 | 6349 | |
fb5ccc98 | 6350 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6351 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6352 | if (kthread_should_park()) { |
6c271ce2 JA |
6353 | finish_wait(&ctx->sqo_wait, &wait); |
6354 | break; | |
6355 | } | |
b41e9852 JA |
6356 | if (current->task_works) { |
6357 | task_work_run(); | |
10bea96d | 6358 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
6359 | continue; |
6360 | } | |
6c271ce2 JA |
6361 | if (signal_pending(current)) |
6362 | flush_signals(current); | |
6363 | schedule(); | |
6364 | finish_wait(&ctx->sqo_wait, &wait); | |
6365 | ||
75b28aff | 6366 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
d4ae271d | 6367 | ret = 0; |
6c271ce2 JA |
6368 | continue; |
6369 | } | |
6370 | finish_wait(&ctx->sqo_wait, &wait); | |
6371 | ||
75b28aff | 6372 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
6373 | } |
6374 | ||
8a4955ff | 6375 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6376 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6377 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6378 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6379 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6380 | } |
6381 | ||
b41e9852 JA |
6382 | if (current->task_works) |
6383 | task_work_run(); | |
6384 | ||
bf9c2f1c | 6385 | io_sq_thread_drop_mm(ctx); |
181e448d | 6386 | revert_creds(old_cred); |
06058632 | 6387 | |
2bbcd6d3 | 6388 | kthread_parkme(); |
06058632 | 6389 | |
6c271ce2 JA |
6390 | return 0; |
6391 | } | |
6392 | ||
bda52162 JA |
6393 | struct io_wait_queue { |
6394 | struct wait_queue_entry wq; | |
6395 | struct io_ring_ctx *ctx; | |
6396 | unsigned to_wait; | |
6397 | unsigned nr_timeouts; | |
6398 | }; | |
6399 | ||
1d7bb1d5 | 6400 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6401 | { |
6402 | struct io_ring_ctx *ctx = iowq->ctx; | |
6403 | ||
6404 | /* | |
d195a66e | 6405 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6406 | * started waiting. For timeouts, we always want to return to userspace, |
6407 | * regardless of event count. | |
6408 | */ | |
1d7bb1d5 | 6409 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6410 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6411 | } | |
6412 | ||
6413 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6414 | int wake_flags, void *key) | |
6415 | { | |
6416 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6417 | wq); | |
6418 | ||
1d7bb1d5 JA |
6419 | /* use noflush == true, as we can't safely rely on locking context */ |
6420 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6421 | return -1; |
6422 | ||
6423 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6424 | } | |
6425 | ||
2b188cc1 JA |
6426 | /* |
6427 | * Wait until events become available, if we don't already have some. The | |
6428 | * application must reap them itself, as they reside on the shared cq ring. | |
6429 | */ | |
6430 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6431 | const sigset_t __user *sig, size_t sigsz) | |
6432 | { | |
bda52162 JA |
6433 | struct io_wait_queue iowq = { |
6434 | .wq = { | |
6435 | .private = current, | |
6436 | .func = io_wake_function, | |
6437 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6438 | }, | |
6439 | .ctx = ctx, | |
6440 | .to_wait = min_events, | |
6441 | }; | |
75b28aff | 6442 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6443 | int ret = 0; |
2b188cc1 | 6444 | |
b41e9852 JA |
6445 | do { |
6446 | if (io_cqring_events(ctx, false) >= min_events) | |
6447 | return 0; | |
6448 | if (!current->task_works) | |
6449 | break; | |
6450 | task_work_run(); | |
6451 | } while (1); | |
2b188cc1 JA |
6452 | |
6453 | if (sig) { | |
9e75ad5d AB |
6454 | #ifdef CONFIG_COMPAT |
6455 | if (in_compat_syscall()) | |
6456 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6457 | sigsz); |
9e75ad5d AB |
6458 | else |
6459 | #endif | |
b772434b | 6460 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6461 | |
2b188cc1 JA |
6462 | if (ret) |
6463 | return ret; | |
6464 | } | |
6465 | ||
bda52162 | 6466 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6467 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6468 | do { |
6469 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6470 | TASK_INTERRUPTIBLE); | |
b41e9852 JA |
6471 | if (current->task_works) |
6472 | task_work_run(); | |
1d7bb1d5 | 6473 | if (io_should_wake(&iowq, false)) |
bda52162 JA |
6474 | break; |
6475 | schedule(); | |
6476 | if (signal_pending(current)) { | |
e9ffa5c2 | 6477 | ret = -EINTR; |
bda52162 JA |
6478 | break; |
6479 | } | |
6480 | } while (1); | |
6481 | finish_wait(&ctx->wait, &iowq.wq); | |
6482 | ||
e9ffa5c2 | 6483 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6484 | |
75b28aff | 6485 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6486 | } |
6487 | ||
6b06314c JA |
6488 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6489 | { | |
6490 | #if defined(CONFIG_UNIX) | |
6491 | if (ctx->ring_sock) { | |
6492 | struct sock *sock = ctx->ring_sock->sk; | |
6493 | struct sk_buff *skb; | |
6494 | ||
6495 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6496 | kfree_skb(skb); | |
6497 | } | |
6498 | #else | |
6499 | int i; | |
6500 | ||
65e19f54 JA |
6501 | for (i = 0; i < ctx->nr_user_files; i++) { |
6502 | struct file *file; | |
6503 | ||
6504 | file = io_file_from_index(ctx, i); | |
6505 | if (file) | |
6506 | fput(file); | |
6507 | } | |
6b06314c JA |
6508 | #endif |
6509 | } | |
6510 | ||
05f3fb3c JA |
6511 | static void io_file_ref_kill(struct percpu_ref *ref) |
6512 | { | |
6513 | struct fixed_file_data *data; | |
6514 | ||
6515 | data = container_of(ref, struct fixed_file_data, refs); | |
6516 | complete(&data->done); | |
6517 | } | |
6518 | ||
6b06314c JA |
6519 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6520 | { | |
05f3fb3c | 6521 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6522 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6523 | unsigned nr_tables, i; |
6524 | ||
05f3fb3c | 6525 | if (!data) |
6b06314c JA |
6526 | return -ENXIO; |
6527 | ||
6a4d07cd | 6528 | spin_lock(&data->lock); |
05589553 XW |
6529 | if (!list_empty(&data->ref_list)) |
6530 | ref_node = list_first_entry(&data->ref_list, | |
6531 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6532 | spin_unlock(&data->lock); |
05589553 XW |
6533 | if (ref_node) |
6534 | percpu_ref_kill(&ref_node->refs); | |
6535 | ||
6536 | percpu_ref_kill(&data->refs); | |
6537 | ||
6538 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6539 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6540 | wait_for_completion(&data->done); |
05f3fb3c | 6541 | |
6b06314c | 6542 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6543 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6544 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6545 | kfree(data->table[i].files); |
6546 | kfree(data->table); | |
05589553 XW |
6547 | percpu_ref_exit(&data->refs); |
6548 | kfree(data); | |
05f3fb3c | 6549 | ctx->file_data = NULL; |
6b06314c JA |
6550 | ctx->nr_user_files = 0; |
6551 | return 0; | |
6552 | } | |
6553 | ||
6c271ce2 JA |
6554 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6555 | { | |
6556 | if (ctx->sqo_thread) { | |
0f158b4c | 6557 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6558 | /* |
6559 | * The park is a bit of a work-around, without it we get | |
6560 | * warning spews on shutdown with SQPOLL set and affinity | |
6561 | * set to a single CPU. | |
6562 | */ | |
06058632 | 6563 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6564 | kthread_stop(ctx->sqo_thread); |
6565 | ctx->sqo_thread = NULL; | |
6566 | } | |
6567 | } | |
6568 | ||
6b06314c JA |
6569 | static void io_finish_async(struct io_ring_ctx *ctx) |
6570 | { | |
6c271ce2 JA |
6571 | io_sq_thread_stop(ctx); |
6572 | ||
561fb04a JA |
6573 | if (ctx->io_wq) { |
6574 | io_wq_destroy(ctx->io_wq); | |
6575 | ctx->io_wq = NULL; | |
6b06314c JA |
6576 | } |
6577 | } | |
6578 | ||
6579 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6580 | /* |
6581 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6582 | * the io_uring can be safely unregistered on process exit, even if we have | |
6583 | * loops in the file referencing. | |
6584 | */ | |
6585 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6586 | { | |
6587 | struct sock *sk = ctx->ring_sock->sk; | |
6588 | struct scm_fp_list *fpl; | |
6589 | struct sk_buff *skb; | |
08a45173 | 6590 | int i, nr_files; |
6b06314c | 6591 | |
6b06314c JA |
6592 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6593 | if (!fpl) | |
6594 | return -ENOMEM; | |
6595 | ||
6596 | skb = alloc_skb(0, GFP_KERNEL); | |
6597 | if (!skb) { | |
6598 | kfree(fpl); | |
6599 | return -ENOMEM; | |
6600 | } | |
6601 | ||
6602 | skb->sk = sk; | |
6b06314c | 6603 | |
08a45173 | 6604 | nr_files = 0; |
6b06314c JA |
6605 | fpl->user = get_uid(ctx->user); |
6606 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6607 | struct file *file = io_file_from_index(ctx, i + offset); |
6608 | ||
6609 | if (!file) | |
08a45173 | 6610 | continue; |
65e19f54 | 6611 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6612 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6613 | nr_files++; | |
6b06314c JA |
6614 | } |
6615 | ||
08a45173 JA |
6616 | if (nr_files) { |
6617 | fpl->max = SCM_MAX_FD; | |
6618 | fpl->count = nr_files; | |
6619 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6620 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6621 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6622 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6623 | |
08a45173 JA |
6624 | for (i = 0; i < nr_files; i++) |
6625 | fput(fpl->fp[i]); | |
6626 | } else { | |
6627 | kfree_skb(skb); | |
6628 | kfree(fpl); | |
6629 | } | |
6b06314c JA |
6630 | |
6631 | return 0; | |
6632 | } | |
6633 | ||
6634 | /* | |
6635 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6636 | * causes regular reference counting to break down. We rely on the UNIX | |
6637 | * garbage collection to take care of this problem for us. | |
6638 | */ | |
6639 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6640 | { | |
6641 | unsigned left, total; | |
6642 | int ret = 0; | |
6643 | ||
6644 | total = 0; | |
6645 | left = ctx->nr_user_files; | |
6646 | while (left) { | |
6647 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6648 | |
6649 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6650 | if (ret) | |
6651 | break; | |
6652 | left -= this_files; | |
6653 | total += this_files; | |
6654 | } | |
6655 | ||
6656 | if (!ret) | |
6657 | return 0; | |
6658 | ||
6659 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6660 | struct file *file = io_file_from_index(ctx, total); |
6661 | ||
6662 | if (file) | |
6663 | fput(file); | |
6b06314c JA |
6664 | total++; |
6665 | } | |
6666 | ||
6667 | return ret; | |
6668 | } | |
6669 | #else | |
6670 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6671 | { | |
6672 | return 0; | |
6673 | } | |
6674 | #endif | |
6675 | ||
65e19f54 JA |
6676 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6677 | unsigned nr_files) | |
6678 | { | |
6679 | int i; | |
6680 | ||
6681 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6682 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6683 | unsigned this_files; |
6684 | ||
6685 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6686 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6687 | GFP_KERNEL); | |
6688 | if (!table->files) | |
6689 | break; | |
6690 | nr_files -= this_files; | |
6691 | } | |
6692 | ||
6693 | if (i == nr_tables) | |
6694 | return 0; | |
6695 | ||
6696 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6697 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6698 | kfree(table->files); |
6699 | } | |
6700 | return 1; | |
6701 | } | |
6702 | ||
05f3fb3c JA |
6703 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6704 | { | |
6705 | #if defined(CONFIG_UNIX) | |
6706 | struct sock *sock = ctx->ring_sock->sk; | |
6707 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6708 | struct sk_buff *skb; | |
6709 | int i; | |
6710 | ||
6711 | __skb_queue_head_init(&list); | |
6712 | ||
6713 | /* | |
6714 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6715 | * remove this entry and rearrange the file array. | |
6716 | */ | |
6717 | skb = skb_dequeue(head); | |
6718 | while (skb) { | |
6719 | struct scm_fp_list *fp; | |
6720 | ||
6721 | fp = UNIXCB(skb).fp; | |
6722 | for (i = 0; i < fp->count; i++) { | |
6723 | int left; | |
6724 | ||
6725 | if (fp->fp[i] != file) | |
6726 | continue; | |
6727 | ||
6728 | unix_notinflight(fp->user, fp->fp[i]); | |
6729 | left = fp->count - 1 - i; | |
6730 | if (left) { | |
6731 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6732 | left * sizeof(struct file *)); | |
6733 | } | |
6734 | fp->count--; | |
6735 | if (!fp->count) { | |
6736 | kfree_skb(skb); | |
6737 | skb = NULL; | |
6738 | } else { | |
6739 | __skb_queue_tail(&list, skb); | |
6740 | } | |
6741 | fput(file); | |
6742 | file = NULL; | |
6743 | break; | |
6744 | } | |
6745 | ||
6746 | if (!file) | |
6747 | break; | |
6748 | ||
6749 | __skb_queue_tail(&list, skb); | |
6750 | ||
6751 | skb = skb_dequeue(head); | |
6752 | } | |
6753 | ||
6754 | if (skb_peek(&list)) { | |
6755 | spin_lock_irq(&head->lock); | |
6756 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6757 | __skb_queue_tail(head, skb); | |
6758 | spin_unlock_irq(&head->lock); | |
6759 | } | |
6760 | #else | |
6761 | fput(file); | |
6762 | #endif | |
6763 | } | |
6764 | ||
6765 | struct io_file_put { | |
05589553 | 6766 | struct list_head list; |
05f3fb3c | 6767 | struct file *file; |
05f3fb3c JA |
6768 | }; |
6769 | ||
4a38aed2 | 6770 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6771 | { |
4a38aed2 JA |
6772 | struct fixed_file_data *file_data = ref_node->file_data; |
6773 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6774 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6775 | |
6776 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6777 | list_del(&pfile->list); |
05589553 XW |
6778 | io_ring_file_put(ctx, pfile->file); |
6779 | kfree(pfile); | |
65e19f54 | 6780 | } |
05589553 | 6781 | |
6a4d07cd JA |
6782 | spin_lock(&file_data->lock); |
6783 | list_del(&ref_node->node); | |
6784 | spin_unlock(&file_data->lock); | |
05589553 XW |
6785 | |
6786 | percpu_ref_exit(&ref_node->refs); | |
6787 | kfree(ref_node); | |
6788 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6789 | } |
65e19f54 | 6790 | |
4a38aed2 JA |
6791 | static void io_file_put_work(struct work_struct *work) |
6792 | { | |
6793 | struct io_ring_ctx *ctx; | |
6794 | struct llist_node *node; | |
6795 | ||
6796 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6797 | node = llist_del_all(&ctx->file_put_llist); | |
6798 | ||
6799 | while (node) { | |
6800 | struct fixed_file_ref_node *ref_node; | |
6801 | struct llist_node *next = node->next; | |
6802 | ||
6803 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6804 | __io_file_put_work(ref_node); | |
6805 | node = next; | |
6806 | } | |
6807 | } | |
6808 | ||
05589553 | 6809 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6810 | { |
05589553 | 6811 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6812 | struct io_ring_ctx *ctx; |
6813 | bool first_add; | |
6814 | int delay = HZ; | |
65e19f54 | 6815 | |
05589553 | 6816 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6817 | ctx = ref_node->file_data->ctx; |
05589553 | 6818 | |
4a38aed2 JA |
6819 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6820 | delay = 0; | |
05589553 | 6821 | |
4a38aed2 JA |
6822 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
6823 | if (!delay) | |
6824 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
6825 | else if (first_add) | |
6826 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 6827 | } |
65e19f54 | 6828 | |
05589553 XW |
6829 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6830 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6831 | { |
05589553 | 6832 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6833 | |
05589553 XW |
6834 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6835 | if (!ref_node) | |
6836 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6837 | |
05589553 XW |
6838 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6839 | 0, GFP_KERNEL)) { | |
6840 | kfree(ref_node); | |
6841 | return ERR_PTR(-ENOMEM); | |
6842 | } | |
6843 | INIT_LIST_HEAD(&ref_node->node); | |
6844 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
6845 | ref_node->file_data = ctx->file_data; |
6846 | return ref_node; | |
05589553 XW |
6847 | } |
6848 | ||
6849 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6850 | { | |
6851 | percpu_ref_exit(&ref_node->refs); | |
6852 | kfree(ref_node); | |
65e19f54 JA |
6853 | } |
6854 | ||
6b06314c JA |
6855 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6856 | unsigned nr_args) | |
6857 | { | |
6858 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6859 | unsigned nr_tables; |
05f3fb3c | 6860 | struct file *file; |
6b06314c JA |
6861 | int fd, ret = 0; |
6862 | unsigned i; | |
05589553 | 6863 | struct fixed_file_ref_node *ref_node; |
6b06314c | 6864 | |
05f3fb3c | 6865 | if (ctx->file_data) |
6b06314c JA |
6866 | return -EBUSY; |
6867 | if (!nr_args) | |
6868 | return -EINVAL; | |
6869 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6870 | return -EMFILE; | |
6871 | ||
05f3fb3c JA |
6872 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6873 | if (!ctx->file_data) | |
6874 | return -ENOMEM; | |
6875 | ctx->file_data->ctx = ctx; | |
6876 | init_completion(&ctx->file_data->done); | |
05589553 | 6877 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 6878 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 6879 | |
65e19f54 | 6880 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6881 | ctx->file_data->table = kcalloc(nr_tables, |
6882 | sizeof(struct fixed_file_table), | |
65e19f54 | 6883 | GFP_KERNEL); |
05f3fb3c JA |
6884 | if (!ctx->file_data->table) { |
6885 | kfree(ctx->file_data); | |
6886 | ctx->file_data = NULL; | |
6b06314c | 6887 | return -ENOMEM; |
05f3fb3c JA |
6888 | } |
6889 | ||
05589553 | 6890 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6891 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6892 | kfree(ctx->file_data->table); | |
6893 | kfree(ctx->file_data); | |
6894 | ctx->file_data = NULL; | |
6b06314c | 6895 | return -ENOMEM; |
05f3fb3c | 6896 | } |
6b06314c | 6897 | |
65e19f54 | 6898 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6899 | percpu_ref_exit(&ctx->file_data->refs); |
6900 | kfree(ctx->file_data->table); | |
6901 | kfree(ctx->file_data); | |
6902 | ctx->file_data = NULL; | |
65e19f54 JA |
6903 | return -ENOMEM; |
6904 | } | |
6905 | ||
08a45173 | 6906 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6907 | struct fixed_file_table *table; |
6908 | unsigned index; | |
6909 | ||
6b06314c JA |
6910 | ret = -EFAULT; |
6911 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6912 | break; | |
08a45173 JA |
6913 | /* allow sparse sets */ |
6914 | if (fd == -1) { | |
6915 | ret = 0; | |
6916 | continue; | |
6917 | } | |
6b06314c | 6918 | |
05f3fb3c | 6919 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6920 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6921 | file = fget(fd); |
6b06314c JA |
6922 | |
6923 | ret = -EBADF; | |
05f3fb3c | 6924 | if (!file) |
6b06314c | 6925 | break; |
05f3fb3c | 6926 | |
6b06314c JA |
6927 | /* |
6928 | * Don't allow io_uring instances to be registered. If UNIX | |
6929 | * isn't enabled, then this causes a reference cycle and this | |
6930 | * instance can never get freed. If UNIX is enabled we'll | |
6931 | * handle it just fine, but there's still no point in allowing | |
6932 | * a ring fd as it doesn't support regular read/write anyway. | |
6933 | */ | |
05f3fb3c JA |
6934 | if (file->f_op == &io_uring_fops) { |
6935 | fput(file); | |
6b06314c JA |
6936 | break; |
6937 | } | |
6b06314c | 6938 | ret = 0; |
05f3fb3c | 6939 | table->files[index] = file; |
6b06314c JA |
6940 | } |
6941 | ||
6942 | if (ret) { | |
65e19f54 | 6943 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
6944 | file = io_file_from_index(ctx, i); |
6945 | if (file) | |
6946 | fput(file); | |
6947 | } | |
6948 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 6949 | kfree(ctx->file_data->table[i].files); |
6b06314c | 6950 | |
05f3fb3c JA |
6951 | kfree(ctx->file_data->table); |
6952 | kfree(ctx->file_data); | |
6953 | ctx->file_data = NULL; | |
6b06314c JA |
6954 | ctx->nr_user_files = 0; |
6955 | return ret; | |
6956 | } | |
6957 | ||
6958 | ret = io_sqe_files_scm(ctx); | |
05589553 | 6959 | if (ret) { |
6b06314c | 6960 | io_sqe_files_unregister(ctx); |
05589553 XW |
6961 | return ret; |
6962 | } | |
6b06314c | 6963 | |
05589553 XW |
6964 | ref_node = alloc_fixed_file_ref_node(ctx); |
6965 | if (IS_ERR(ref_node)) { | |
6966 | io_sqe_files_unregister(ctx); | |
6967 | return PTR_ERR(ref_node); | |
6968 | } | |
6969 | ||
6970 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6971 | spin_lock(&ctx->file_data->lock); |
05589553 | 6972 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 6973 | spin_unlock(&ctx->file_data->lock); |
05589553 | 6974 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
6975 | return ret; |
6976 | } | |
6977 | ||
c3a31e60 JA |
6978 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
6979 | int index) | |
6980 | { | |
6981 | #if defined(CONFIG_UNIX) | |
6982 | struct sock *sock = ctx->ring_sock->sk; | |
6983 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
6984 | struct sk_buff *skb; | |
6985 | ||
6986 | /* | |
6987 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
6988 | * file set. If there's no room, fall back to allocating a new skb | |
6989 | * and filling it in. | |
6990 | */ | |
6991 | spin_lock_irq(&head->lock); | |
6992 | skb = skb_peek(head); | |
6993 | if (skb) { | |
6994 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
6995 | ||
6996 | if (fpl->count < SCM_MAX_FD) { | |
6997 | __skb_unlink(skb, head); | |
6998 | spin_unlock_irq(&head->lock); | |
6999 | fpl->fp[fpl->count] = get_file(file); | |
7000 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7001 | fpl->count++; | |
7002 | spin_lock_irq(&head->lock); | |
7003 | __skb_queue_head(head, skb); | |
7004 | } else { | |
7005 | skb = NULL; | |
7006 | } | |
7007 | } | |
7008 | spin_unlock_irq(&head->lock); | |
7009 | ||
7010 | if (skb) { | |
7011 | fput(file); | |
7012 | return 0; | |
7013 | } | |
7014 | ||
7015 | return __io_sqe_files_scm(ctx, 1, index); | |
7016 | #else | |
7017 | return 0; | |
7018 | #endif | |
7019 | } | |
7020 | ||
a5318d3c | 7021 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7022 | struct file *file) |
05f3fb3c | 7023 | { |
a5318d3c | 7024 | struct io_file_put *pfile; |
05589553 XW |
7025 | struct percpu_ref *refs = data->cur_refs; |
7026 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7027 | |
05f3fb3c | 7028 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7029 | if (!pfile) |
7030 | return -ENOMEM; | |
05f3fb3c | 7031 | |
05589553 | 7032 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7033 | pfile->file = file; |
05589553 XW |
7034 | list_add(&pfile->list, &ref_node->file_list); |
7035 | ||
a5318d3c | 7036 | return 0; |
05f3fb3c JA |
7037 | } |
7038 | ||
7039 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7040 | struct io_uring_files_update *up, | |
7041 | unsigned nr_args) | |
7042 | { | |
7043 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7044 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7045 | struct file *file; |
c3a31e60 JA |
7046 | __s32 __user *fds; |
7047 | int fd, i, err; | |
7048 | __u32 done; | |
05589553 | 7049 | bool needs_switch = false; |
c3a31e60 | 7050 | |
05f3fb3c | 7051 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7052 | return -EOVERFLOW; |
7053 | if (done > ctx->nr_user_files) | |
7054 | return -EINVAL; | |
7055 | ||
05589553 XW |
7056 | ref_node = alloc_fixed_file_ref_node(ctx); |
7057 | if (IS_ERR(ref_node)) | |
7058 | return PTR_ERR(ref_node); | |
7059 | ||
c3a31e60 | 7060 | done = 0; |
05f3fb3c | 7061 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7062 | while (nr_args) { |
65e19f54 JA |
7063 | struct fixed_file_table *table; |
7064 | unsigned index; | |
7065 | ||
c3a31e60 JA |
7066 | err = 0; |
7067 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7068 | err = -EFAULT; | |
7069 | break; | |
7070 | } | |
05f3fb3c JA |
7071 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7072 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7073 | index = i & IORING_FILE_TABLE_MASK; |
7074 | if (table->files[index]) { | |
05f3fb3c | 7075 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
7076 | err = io_queue_file_removal(data, file); |
7077 | if (err) | |
7078 | break; | |
65e19f54 | 7079 | table->files[index] = NULL; |
05589553 | 7080 | needs_switch = true; |
c3a31e60 JA |
7081 | } |
7082 | if (fd != -1) { | |
c3a31e60 JA |
7083 | file = fget(fd); |
7084 | if (!file) { | |
7085 | err = -EBADF; | |
7086 | break; | |
7087 | } | |
7088 | /* | |
7089 | * Don't allow io_uring instances to be registered. If | |
7090 | * UNIX isn't enabled, then this causes a reference | |
7091 | * cycle and this instance can never get freed. If UNIX | |
7092 | * is enabled we'll handle it just fine, but there's | |
7093 | * still no point in allowing a ring fd as it doesn't | |
7094 | * support regular read/write anyway. | |
7095 | */ | |
7096 | if (file->f_op == &io_uring_fops) { | |
7097 | fput(file); | |
7098 | err = -EBADF; | |
7099 | break; | |
7100 | } | |
65e19f54 | 7101 | table->files[index] = file; |
c3a31e60 JA |
7102 | err = io_sqe_file_register(ctx, file, i); |
7103 | if (err) | |
7104 | break; | |
7105 | } | |
7106 | nr_args--; | |
7107 | done++; | |
05f3fb3c JA |
7108 | up->offset++; |
7109 | } | |
7110 | ||
05589553 XW |
7111 | if (needs_switch) { |
7112 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7113 | spin_lock(&data->lock); |
05589553 XW |
7114 | list_add(&ref_node->node, &data->ref_list); |
7115 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7116 | spin_unlock(&data->lock); |
05589553 XW |
7117 | percpu_ref_get(&ctx->file_data->refs); |
7118 | } else | |
7119 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7120 | |
7121 | return done ? done : err; | |
7122 | } | |
05589553 | 7123 | |
05f3fb3c JA |
7124 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7125 | unsigned nr_args) | |
7126 | { | |
7127 | struct io_uring_files_update up; | |
7128 | ||
7129 | if (!ctx->file_data) | |
7130 | return -ENXIO; | |
7131 | if (!nr_args) | |
7132 | return -EINVAL; | |
7133 | if (copy_from_user(&up, arg, sizeof(up))) | |
7134 | return -EFAULT; | |
7135 | if (up.resv) | |
7136 | return -EINVAL; | |
7137 | ||
7138 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7139 | } | |
c3a31e60 | 7140 | |
e9fd9396 | 7141 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7142 | { |
7143 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7144 | ||
e9fd9396 | 7145 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7146 | io_put_req(req); |
7147 | } | |
7148 | ||
24369c2e PB |
7149 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7150 | struct io_uring_params *p) | |
7151 | { | |
7152 | struct io_wq_data data; | |
7153 | struct fd f; | |
7154 | struct io_ring_ctx *ctx_attach; | |
7155 | unsigned int concurrency; | |
7156 | int ret = 0; | |
7157 | ||
7158 | data.user = ctx->user; | |
e9fd9396 | 7159 | data.free_work = io_free_work; |
f5fa38c5 | 7160 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7161 | |
7162 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7163 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7164 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7165 | ||
7166 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7167 | if (IS_ERR(ctx->io_wq)) { | |
7168 | ret = PTR_ERR(ctx->io_wq); | |
7169 | ctx->io_wq = NULL; | |
7170 | } | |
7171 | return ret; | |
7172 | } | |
7173 | ||
7174 | f = fdget(p->wq_fd); | |
7175 | if (!f.file) | |
7176 | return -EBADF; | |
7177 | ||
7178 | if (f.file->f_op != &io_uring_fops) { | |
7179 | ret = -EINVAL; | |
7180 | goto out_fput; | |
7181 | } | |
7182 | ||
7183 | ctx_attach = f.file->private_data; | |
7184 | /* @io_wq is protected by holding the fd */ | |
7185 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7186 | ret = -EINVAL; | |
7187 | goto out_fput; | |
7188 | } | |
7189 | ||
7190 | ctx->io_wq = ctx_attach->io_wq; | |
7191 | out_fput: | |
7192 | fdput(f); | |
7193 | return ret; | |
7194 | } | |
7195 | ||
6c271ce2 JA |
7196 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7197 | struct io_uring_params *p) | |
2b188cc1 JA |
7198 | { |
7199 | int ret; | |
7200 | ||
7201 | mmgrab(current->mm); | |
7202 | ctx->sqo_mm = current->mm; | |
7203 | ||
6c271ce2 | 7204 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
7205 | ret = -EPERM; |
7206 | if (!capable(CAP_SYS_ADMIN)) | |
7207 | goto err; | |
7208 | ||
917257da JA |
7209 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7210 | if (!ctx->sq_thread_idle) | |
7211 | ctx->sq_thread_idle = HZ; | |
7212 | ||
6c271ce2 | 7213 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7214 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7215 | |
917257da | 7216 | ret = -EINVAL; |
44a9bd18 JA |
7217 | if (cpu >= nr_cpu_ids) |
7218 | goto err; | |
7889f44d | 7219 | if (!cpu_online(cpu)) |
917257da JA |
7220 | goto err; |
7221 | ||
6c271ce2 JA |
7222 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7223 | ctx, cpu, | |
7224 | "io_uring-sq"); | |
7225 | } else { | |
7226 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7227 | "io_uring-sq"); | |
7228 | } | |
7229 | if (IS_ERR(ctx->sqo_thread)) { | |
7230 | ret = PTR_ERR(ctx->sqo_thread); | |
7231 | ctx->sqo_thread = NULL; | |
7232 | goto err; | |
7233 | } | |
7234 | wake_up_process(ctx->sqo_thread); | |
7235 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7236 | /* Can't have SQ_AFF without SQPOLL */ | |
7237 | ret = -EINVAL; | |
7238 | goto err; | |
7239 | } | |
7240 | ||
24369c2e PB |
7241 | ret = io_init_wq_offload(ctx, p); |
7242 | if (ret) | |
2b188cc1 | 7243 | goto err; |
2b188cc1 JA |
7244 | |
7245 | return 0; | |
7246 | err: | |
54a91f3b | 7247 | io_finish_async(ctx); |
2b188cc1 JA |
7248 | mmdrop(ctx->sqo_mm); |
7249 | ctx->sqo_mm = NULL; | |
7250 | return ret; | |
7251 | } | |
7252 | ||
a087e2b5 BM |
7253 | static inline void __io_unaccount_mem(struct user_struct *user, |
7254 | unsigned long nr_pages) | |
2b188cc1 JA |
7255 | { |
7256 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7257 | } | |
7258 | ||
a087e2b5 BM |
7259 | static inline int __io_account_mem(struct user_struct *user, |
7260 | unsigned long nr_pages) | |
2b188cc1 JA |
7261 | { |
7262 | unsigned long page_limit, cur_pages, new_pages; | |
7263 | ||
7264 | /* Don't allow more pages than we can safely lock */ | |
7265 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7266 | ||
7267 | do { | |
7268 | cur_pages = atomic_long_read(&user->locked_vm); | |
7269 | new_pages = cur_pages + nr_pages; | |
7270 | if (new_pages > page_limit) | |
7271 | return -ENOMEM; | |
7272 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7273 | new_pages) != cur_pages); | |
7274 | ||
7275 | return 0; | |
7276 | } | |
7277 | ||
2e0464d4 BM |
7278 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7279 | enum io_mem_account acct) | |
a087e2b5 | 7280 | { |
aad5d8da | 7281 | if (ctx->limit_mem) |
a087e2b5 | 7282 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7283 | |
2e0464d4 BM |
7284 | if (ctx->sqo_mm) { |
7285 | if (acct == ACCT_LOCKED) | |
7286 | ctx->sqo_mm->locked_vm -= nr_pages; | |
7287 | else if (acct == ACCT_PINNED) | |
7288 | atomic64_sub(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7289 | } | |
a087e2b5 BM |
7290 | } |
7291 | ||
2e0464d4 BM |
7292 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7293 | enum io_mem_account acct) | |
a087e2b5 | 7294 | { |
30975825 BM |
7295 | int ret; |
7296 | ||
7297 | if (ctx->limit_mem) { | |
7298 | ret = __io_account_mem(ctx->user, nr_pages); | |
7299 | if (ret) | |
7300 | return ret; | |
7301 | } | |
7302 | ||
2e0464d4 BM |
7303 | if (ctx->sqo_mm) { |
7304 | if (acct == ACCT_LOCKED) | |
7305 | ctx->sqo_mm->locked_vm += nr_pages; | |
7306 | else if (acct == ACCT_PINNED) | |
7307 | atomic64_add(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7308 | } | |
a087e2b5 BM |
7309 | |
7310 | return 0; | |
7311 | } | |
7312 | ||
2b188cc1 JA |
7313 | static void io_mem_free(void *ptr) |
7314 | { | |
52e04ef4 MR |
7315 | struct page *page; |
7316 | ||
7317 | if (!ptr) | |
7318 | return; | |
2b188cc1 | 7319 | |
52e04ef4 | 7320 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7321 | if (put_page_testzero(page)) |
7322 | free_compound_page(page); | |
7323 | } | |
7324 | ||
7325 | static void *io_mem_alloc(size_t size) | |
7326 | { | |
7327 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7328 | __GFP_NORETRY; | |
7329 | ||
7330 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7331 | } | |
7332 | ||
75b28aff HV |
7333 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7334 | size_t *sq_offset) | |
7335 | { | |
7336 | struct io_rings *rings; | |
7337 | size_t off, sq_array_size; | |
7338 | ||
7339 | off = struct_size(rings, cqes, cq_entries); | |
7340 | if (off == SIZE_MAX) | |
7341 | return SIZE_MAX; | |
7342 | ||
7343 | #ifdef CONFIG_SMP | |
7344 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7345 | if (off == 0) | |
7346 | return SIZE_MAX; | |
7347 | #endif | |
7348 | ||
7349 | sq_array_size = array_size(sizeof(u32), sq_entries); | |
7350 | if (sq_array_size == SIZE_MAX) | |
7351 | return SIZE_MAX; | |
7352 | ||
7353 | if (check_add_overflow(off, sq_array_size, &off)) | |
7354 | return SIZE_MAX; | |
7355 | ||
7356 | if (sq_offset) | |
7357 | *sq_offset = off; | |
7358 | ||
7359 | return off; | |
7360 | } | |
7361 | ||
2b188cc1 JA |
7362 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7363 | { | |
75b28aff | 7364 | size_t pages; |
2b188cc1 | 7365 | |
75b28aff HV |
7366 | pages = (size_t)1 << get_order( |
7367 | rings_size(sq_entries, cq_entries, NULL)); | |
7368 | pages += (size_t)1 << get_order( | |
7369 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7370 | |
75b28aff | 7371 | return pages; |
2b188cc1 JA |
7372 | } |
7373 | ||
edafccee JA |
7374 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7375 | { | |
7376 | int i, j; | |
7377 | ||
7378 | if (!ctx->user_bufs) | |
7379 | return -ENXIO; | |
7380 | ||
7381 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7382 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7383 | ||
7384 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7385 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7386 | |
2e0464d4 | 7387 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7388 | kvfree(imu->bvec); |
edafccee JA |
7389 | imu->nr_bvecs = 0; |
7390 | } | |
7391 | ||
7392 | kfree(ctx->user_bufs); | |
7393 | ctx->user_bufs = NULL; | |
7394 | ctx->nr_user_bufs = 0; | |
7395 | return 0; | |
7396 | } | |
7397 | ||
7398 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7399 | void __user *arg, unsigned index) | |
7400 | { | |
7401 | struct iovec __user *src; | |
7402 | ||
7403 | #ifdef CONFIG_COMPAT | |
7404 | if (ctx->compat) { | |
7405 | struct compat_iovec __user *ciovs; | |
7406 | struct compat_iovec ciov; | |
7407 | ||
7408 | ciovs = (struct compat_iovec __user *) arg; | |
7409 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7410 | return -EFAULT; | |
7411 | ||
d55e5f5b | 7412 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7413 | dst->iov_len = ciov.iov_len; |
7414 | return 0; | |
7415 | } | |
7416 | #endif | |
7417 | src = (struct iovec __user *) arg; | |
7418 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7419 | return -EFAULT; | |
7420 | return 0; | |
7421 | } | |
7422 | ||
7423 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7424 | unsigned nr_args) | |
7425 | { | |
7426 | struct vm_area_struct **vmas = NULL; | |
7427 | struct page **pages = NULL; | |
7428 | int i, j, got_pages = 0; | |
7429 | int ret = -EINVAL; | |
7430 | ||
7431 | if (ctx->user_bufs) | |
7432 | return -EBUSY; | |
7433 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7434 | return -EINVAL; | |
7435 | ||
7436 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7437 | GFP_KERNEL); | |
7438 | if (!ctx->user_bufs) | |
7439 | return -ENOMEM; | |
7440 | ||
7441 | for (i = 0; i < nr_args; i++) { | |
7442 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7443 | unsigned long off, start, end, ubuf; | |
7444 | int pret, nr_pages; | |
7445 | struct iovec iov; | |
7446 | size_t size; | |
7447 | ||
7448 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7449 | if (ret) | |
a278682d | 7450 | goto err; |
edafccee JA |
7451 | |
7452 | /* | |
7453 | * Don't impose further limits on the size and buffer | |
7454 | * constraints here, we'll -EINVAL later when IO is | |
7455 | * submitted if they are wrong. | |
7456 | */ | |
7457 | ret = -EFAULT; | |
7458 | if (!iov.iov_base || !iov.iov_len) | |
7459 | goto err; | |
7460 | ||
7461 | /* arbitrary limit, but we need something */ | |
7462 | if (iov.iov_len > SZ_1G) | |
7463 | goto err; | |
7464 | ||
7465 | ubuf = (unsigned long) iov.iov_base; | |
7466 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7467 | start = ubuf >> PAGE_SHIFT; | |
7468 | nr_pages = end - start; | |
7469 | ||
2e0464d4 | 7470 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7471 | if (ret) |
7472 | goto err; | |
edafccee JA |
7473 | |
7474 | ret = 0; | |
7475 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7476 | kvfree(vmas); |
7477 | kvfree(pages); | |
d4ef6475 | 7478 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7479 | GFP_KERNEL); |
d4ef6475 | 7480 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7481 | sizeof(struct vm_area_struct *), |
7482 | GFP_KERNEL); | |
7483 | if (!pages || !vmas) { | |
7484 | ret = -ENOMEM; | |
2e0464d4 | 7485 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7486 | goto err; |
7487 | } | |
7488 | got_pages = nr_pages; | |
7489 | } | |
7490 | ||
d4ef6475 | 7491 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7492 | GFP_KERNEL); |
7493 | ret = -ENOMEM; | |
7494 | if (!imu->bvec) { | |
2e0464d4 | 7495 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7496 | goto err; |
7497 | } | |
7498 | ||
7499 | ret = 0; | |
d8ed45c5 | 7500 | mmap_read_lock(current->mm); |
2113b05d | 7501 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7502 | FOLL_WRITE | FOLL_LONGTERM, |
7503 | pages, vmas); | |
edafccee JA |
7504 | if (pret == nr_pages) { |
7505 | /* don't support file backed memory */ | |
7506 | for (j = 0; j < nr_pages; j++) { | |
7507 | struct vm_area_struct *vma = vmas[j]; | |
7508 | ||
7509 | if (vma->vm_file && | |
7510 | !is_file_hugepages(vma->vm_file)) { | |
7511 | ret = -EOPNOTSUPP; | |
7512 | break; | |
7513 | } | |
7514 | } | |
7515 | } else { | |
7516 | ret = pret < 0 ? pret : -EFAULT; | |
7517 | } | |
d8ed45c5 | 7518 | mmap_read_unlock(current->mm); |
edafccee JA |
7519 | if (ret) { |
7520 | /* | |
7521 | * if we did partial map, or found file backed vmas, | |
7522 | * release any pages we did get | |
7523 | */ | |
27c4d3a3 | 7524 | if (pret > 0) |
f1f6a7dd | 7525 | unpin_user_pages(pages, pret); |
2e0464d4 | 7526 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7527 | kvfree(imu->bvec); |
edafccee JA |
7528 | goto err; |
7529 | } | |
7530 | ||
7531 | off = ubuf & ~PAGE_MASK; | |
7532 | size = iov.iov_len; | |
7533 | for (j = 0; j < nr_pages; j++) { | |
7534 | size_t vec_len; | |
7535 | ||
7536 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7537 | imu->bvec[j].bv_page = pages[j]; | |
7538 | imu->bvec[j].bv_len = vec_len; | |
7539 | imu->bvec[j].bv_offset = off; | |
7540 | off = 0; | |
7541 | size -= vec_len; | |
7542 | } | |
7543 | /* store original address for later verification */ | |
7544 | imu->ubuf = ubuf; | |
7545 | imu->len = iov.iov_len; | |
7546 | imu->nr_bvecs = nr_pages; | |
7547 | ||
7548 | ctx->nr_user_bufs++; | |
7549 | } | |
d4ef6475 MR |
7550 | kvfree(pages); |
7551 | kvfree(vmas); | |
edafccee JA |
7552 | return 0; |
7553 | err: | |
d4ef6475 MR |
7554 | kvfree(pages); |
7555 | kvfree(vmas); | |
edafccee JA |
7556 | io_sqe_buffer_unregister(ctx); |
7557 | return ret; | |
7558 | } | |
7559 | ||
9b402849 JA |
7560 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7561 | { | |
7562 | __s32 __user *fds = arg; | |
7563 | int fd; | |
7564 | ||
7565 | if (ctx->cq_ev_fd) | |
7566 | return -EBUSY; | |
7567 | ||
7568 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7569 | return -EFAULT; | |
7570 | ||
7571 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7572 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7573 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7574 | ctx->cq_ev_fd = NULL; | |
7575 | return ret; | |
7576 | } | |
7577 | ||
7578 | return 0; | |
7579 | } | |
7580 | ||
7581 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7582 | { | |
7583 | if (ctx->cq_ev_fd) { | |
7584 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7585 | ctx->cq_ev_fd = NULL; | |
7586 | return 0; | |
7587 | } | |
7588 | ||
7589 | return -ENXIO; | |
7590 | } | |
7591 | ||
5a2e745d JA |
7592 | static int __io_destroy_buffers(int id, void *p, void *data) |
7593 | { | |
7594 | struct io_ring_ctx *ctx = data; | |
7595 | struct io_buffer *buf = p; | |
7596 | ||
067524e9 | 7597 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7598 | return 0; |
7599 | } | |
7600 | ||
7601 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7602 | { | |
7603 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7604 | idr_destroy(&ctx->io_buffer_idr); | |
7605 | } | |
7606 | ||
2b188cc1 JA |
7607 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7608 | { | |
6b06314c | 7609 | io_finish_async(ctx); |
30975825 | 7610 | if (ctx->sqo_mm) { |
2b188cc1 | 7611 | mmdrop(ctx->sqo_mm); |
30975825 BM |
7612 | ctx->sqo_mm = NULL; |
7613 | } | |
def596e9 JA |
7614 | |
7615 | io_iopoll_reap_events(ctx); | |
edafccee | 7616 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7617 | io_sqe_files_unregister(ctx); |
9b402849 | 7618 | io_eventfd_unregister(ctx); |
5a2e745d | 7619 | io_destroy_buffers(ctx); |
41726c9a | 7620 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7621 | |
2b188cc1 | 7622 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7623 | if (ctx->ring_sock) { |
7624 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7625 | sock_release(ctx->ring_sock); |
355e8d26 | 7626 | } |
2b188cc1 JA |
7627 | #endif |
7628 | ||
75b28aff | 7629 | io_mem_free(ctx->rings); |
2b188cc1 | 7630 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7631 | |
7632 | percpu_ref_exit(&ctx->refs); | |
2e0464d4 BM |
7633 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
7634 | ACCT_LOCKED); | |
2b188cc1 | 7635 | free_uid(ctx->user); |
181e448d | 7636 | put_cred(ctx->creds); |
78076bb6 | 7637 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7638 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7639 | kfree(ctx); |
7640 | } | |
7641 | ||
7642 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7643 | { | |
7644 | struct io_ring_ctx *ctx = file->private_data; | |
7645 | __poll_t mask = 0; | |
7646 | ||
7647 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7648 | /* |
7649 | * synchronizes with barrier from wq_has_sleeper call in | |
7650 | * io_commit_cqring | |
7651 | */ | |
2b188cc1 | 7652 | smp_rmb(); |
75b28aff HV |
7653 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7654 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7655 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7656 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7657 | mask |= EPOLLIN | EPOLLRDNORM; |
7658 | ||
7659 | return mask; | |
7660 | } | |
7661 | ||
7662 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7663 | { | |
7664 | struct io_ring_ctx *ctx = file->private_data; | |
7665 | ||
7666 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7667 | } | |
7668 | ||
071698e1 JA |
7669 | static int io_remove_personalities(int id, void *p, void *data) |
7670 | { | |
7671 | struct io_ring_ctx *ctx = data; | |
7672 | const struct cred *cred; | |
7673 | ||
7674 | cred = idr_remove(&ctx->personality_idr, id); | |
7675 | if (cred) | |
7676 | put_cred(cred); | |
7677 | return 0; | |
7678 | } | |
7679 | ||
85faa7b8 JA |
7680 | static void io_ring_exit_work(struct work_struct *work) |
7681 | { | |
7682 | struct io_ring_ctx *ctx; | |
7683 | ||
7684 | ctx = container_of(work, struct io_ring_ctx, exit_work); | |
7685 | if (ctx->rings) | |
7686 | io_cqring_overflow_flush(ctx, true); | |
7687 | ||
56952e91 JA |
7688 | /* |
7689 | * If we're doing polled IO and end up having requests being | |
7690 | * submitted async (out-of-line), then completions can come in while | |
7691 | * we're waiting for refs to drop. We need to reap these manually, | |
7692 | * as nobody else will be looking for them. | |
7693 | */ | |
7694 | while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)) { | |
7695 | io_iopoll_reap_events(ctx); | |
7696 | if (ctx->rings) | |
7697 | io_cqring_overflow_flush(ctx, true); | |
7698 | } | |
85faa7b8 JA |
7699 | io_ring_ctx_free(ctx); |
7700 | } | |
7701 | ||
2b188cc1 JA |
7702 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7703 | { | |
7704 | mutex_lock(&ctx->uring_lock); | |
7705 | percpu_ref_kill(&ctx->refs); | |
7706 | mutex_unlock(&ctx->uring_lock); | |
7707 | ||
5262f567 | 7708 | io_kill_timeouts(ctx); |
221c5eb2 | 7709 | io_poll_remove_all(ctx); |
561fb04a JA |
7710 | |
7711 | if (ctx->io_wq) | |
7712 | io_wq_cancel_all(ctx->io_wq); | |
7713 | ||
def596e9 | 7714 | io_iopoll_reap_events(ctx); |
15dff286 JA |
7715 | /* if we failed setting up the ctx, we might not have any rings */ |
7716 | if (ctx->rings) | |
7717 | io_cqring_overflow_flush(ctx, true); | |
071698e1 | 7718 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
85faa7b8 JA |
7719 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7720 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7721 | } |
7722 | ||
7723 | static int io_uring_release(struct inode *inode, struct file *file) | |
7724 | { | |
7725 | struct io_ring_ctx *ctx = file->private_data; | |
7726 | ||
7727 | file->private_data = NULL; | |
7728 | io_ring_ctx_wait_and_kill(ctx); | |
7729 | return 0; | |
7730 | } | |
7731 | ||
67c4d9e6 PB |
7732 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7733 | { | |
7734 | struct files_struct *files = data; | |
7735 | ||
7736 | return work->files == files; | |
7737 | } | |
7738 | ||
fcb323cc JA |
7739 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7740 | struct files_struct *files) | |
7741 | { | |
67c4d9e6 PB |
7742 | if (list_empty_careful(&ctx->inflight_list)) |
7743 | return; | |
7744 | ||
7745 | /* cancel all at once, should be faster than doing it one by one*/ | |
7746 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
7747 | ||
fcb323cc | 7748 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7749 | struct io_kiocb *cancel_req = NULL, *req; |
7750 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7751 | |
7752 | spin_lock_irq(&ctx->inflight_lock); | |
7753 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7754 | if (req->work.files != files) |
7755 | continue; | |
7756 | /* req is being completed, ignore */ | |
7757 | if (!refcount_inc_not_zero(&req->refs)) | |
7758 | continue; | |
7759 | cancel_req = req; | |
7760 | break; | |
fcb323cc | 7761 | } |
768134d4 | 7762 | if (cancel_req) |
fcb323cc | 7763 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7764 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7765 | spin_unlock_irq(&ctx->inflight_lock); |
7766 | ||
768134d4 JA |
7767 | /* We need to keep going until we don't find a matching req */ |
7768 | if (!cancel_req) | |
fcb323cc | 7769 | break; |
2f6d9b9d | 7770 | |
2ca10259 JA |
7771 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7772 | spin_lock_irq(&ctx->completion_lock); | |
7773 | list_del(&cancel_req->list); | |
7774 | cancel_req->flags &= ~REQ_F_OVERFLOW; | |
7775 | if (list_empty(&ctx->cq_overflow_list)) { | |
7776 | clear_bit(0, &ctx->sq_check_overflow); | |
7777 | clear_bit(0, &ctx->cq_check_overflow); | |
7778 | } | |
7779 | spin_unlock_irq(&ctx->completion_lock); | |
7780 | ||
7781 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7782 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7783 | ||
7784 | /* | |
7785 | * Put inflight ref and overflow ref. If that's | |
7786 | * all we had, then we're done with this request. | |
7787 | */ | |
7788 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7789 | io_free_req(cancel_req); |
d8f1b971 | 7790 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7791 | continue; |
7792 | } | |
7b53d598 PB |
7793 | } else { |
7794 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7795 | io_put_req(cancel_req); | |
2ca10259 JA |
7796 | } |
7797 | ||
fcb323cc | 7798 | schedule(); |
d8f1b971 | 7799 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7800 | } |
7801 | } | |
7802 | ||
801dd57b | 7803 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 7804 | { |
801dd57b PB |
7805 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
7806 | struct task_struct *task = data; | |
44e728b8 | 7807 | |
801dd57b | 7808 | return req->task == task; |
44e728b8 PB |
7809 | } |
7810 | ||
fcb323cc JA |
7811 | static int io_uring_flush(struct file *file, void *data) |
7812 | { | |
7813 | struct io_ring_ctx *ctx = file->private_data; | |
7814 | ||
7815 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7816 | |
7817 | /* | |
7818 | * If the task is going away, cancel work it may have pending | |
7819 | */ | |
801dd57b PB |
7820 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
7821 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 7822 | |
fcb323cc JA |
7823 | return 0; |
7824 | } | |
7825 | ||
6c5c240e RP |
7826 | static void *io_uring_validate_mmap_request(struct file *file, |
7827 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7828 | { |
2b188cc1 | 7829 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7830 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7831 | struct page *page; |
7832 | void *ptr; | |
7833 | ||
7834 | switch (offset) { | |
7835 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7836 | case IORING_OFF_CQ_RING: |
7837 | ptr = ctx->rings; | |
2b188cc1 JA |
7838 | break; |
7839 | case IORING_OFF_SQES: | |
7840 | ptr = ctx->sq_sqes; | |
7841 | break; | |
2b188cc1 | 7842 | default: |
6c5c240e | 7843 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7844 | } |
7845 | ||
7846 | page = virt_to_head_page(ptr); | |
a50b854e | 7847 | if (sz > page_size(page)) |
6c5c240e RP |
7848 | return ERR_PTR(-EINVAL); |
7849 | ||
7850 | return ptr; | |
7851 | } | |
7852 | ||
7853 | #ifdef CONFIG_MMU | |
7854 | ||
7855 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7856 | { | |
7857 | size_t sz = vma->vm_end - vma->vm_start; | |
7858 | unsigned long pfn; | |
7859 | void *ptr; | |
7860 | ||
7861 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7862 | if (IS_ERR(ptr)) | |
7863 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7864 | |
7865 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7866 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7867 | } | |
7868 | ||
6c5c240e RP |
7869 | #else /* !CONFIG_MMU */ |
7870 | ||
7871 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7872 | { | |
7873 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7874 | } | |
7875 | ||
7876 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7877 | { | |
7878 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7879 | } | |
7880 | ||
7881 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7882 | unsigned long addr, unsigned long len, | |
7883 | unsigned long pgoff, unsigned long flags) | |
7884 | { | |
7885 | void *ptr; | |
7886 | ||
7887 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7888 | if (IS_ERR(ptr)) | |
7889 | return PTR_ERR(ptr); | |
7890 | ||
7891 | return (unsigned long) ptr; | |
7892 | } | |
7893 | ||
7894 | #endif /* !CONFIG_MMU */ | |
7895 | ||
2b188cc1 JA |
7896 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7897 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7898 | size_t, sigsz) | |
7899 | { | |
7900 | struct io_ring_ctx *ctx; | |
7901 | long ret = -EBADF; | |
7902 | int submitted = 0; | |
7903 | struct fd f; | |
7904 | ||
b41e9852 JA |
7905 | if (current->task_works) |
7906 | task_work_run(); | |
7907 | ||
6c271ce2 | 7908 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7909 | return -EINVAL; |
7910 | ||
7911 | f = fdget(fd); | |
7912 | if (!f.file) | |
7913 | return -EBADF; | |
7914 | ||
7915 | ret = -EOPNOTSUPP; | |
7916 | if (f.file->f_op != &io_uring_fops) | |
7917 | goto out_fput; | |
7918 | ||
7919 | ret = -ENXIO; | |
7920 | ctx = f.file->private_data; | |
7921 | if (!percpu_ref_tryget(&ctx->refs)) | |
7922 | goto out_fput; | |
7923 | ||
6c271ce2 JA |
7924 | /* |
7925 | * For SQ polling, the thread will do all submissions and completions. | |
7926 | * Just return the requested submit count, and wake the thread if | |
7927 | * we were asked to. | |
7928 | */ | |
b2a9eada | 7929 | ret = 0; |
6c271ce2 | 7930 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
7931 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
7932 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
7933 | if (flags & IORING_ENTER_SQ_WAKEUP) |
7934 | wake_up(&ctx->sqo_wait); | |
7935 | submitted = to_submit; | |
b2a9eada | 7936 | } else if (to_submit) { |
2b188cc1 | 7937 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 7938 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 7939 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
7940 | |
7941 | if (submitted != to_submit) | |
7942 | goto out; | |
2b188cc1 JA |
7943 | } |
7944 | if (flags & IORING_ENTER_GETEVENTS) { | |
def596e9 JA |
7945 | unsigned nr_events = 0; |
7946 | ||
2b188cc1 JA |
7947 | min_complete = min(min_complete, ctx->cq_entries); |
7948 | ||
32b2244a XW |
7949 | /* |
7950 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
7951 | * space applications don't need to do io completion events | |
7952 | * polling again, they can rely on io_sq_thread to do polling | |
7953 | * work, which can reduce cpu usage and uring_lock contention. | |
7954 | */ | |
7955 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
7956 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
def596e9 | 7957 | ret = io_iopoll_check(ctx, &nr_events, min_complete); |
def596e9 JA |
7958 | } else { |
7959 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
7960 | } | |
2b188cc1 JA |
7961 | } |
7962 | ||
7c504e65 | 7963 | out: |
6805b32e | 7964 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
7965 | out_fput: |
7966 | fdput(f); | |
7967 | return submitted ? submitted : ret; | |
7968 | } | |
7969 | ||
bebdb65e | 7970 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
7971 | static int io_uring_show_cred(int id, void *p, void *data) |
7972 | { | |
7973 | const struct cred *cred = p; | |
7974 | struct seq_file *m = data; | |
7975 | struct user_namespace *uns = seq_user_ns(m); | |
7976 | struct group_info *gi; | |
7977 | kernel_cap_t cap; | |
7978 | unsigned __capi; | |
7979 | int g; | |
7980 | ||
7981 | seq_printf(m, "%5d\n", id); | |
7982 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
7983 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
7984 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
7985 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
7986 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
7987 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
7988 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
7989 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
7990 | seq_puts(m, "\n\tGroups:\t"); | |
7991 | gi = cred->group_info; | |
7992 | for (g = 0; g < gi->ngroups; g++) { | |
7993 | seq_put_decimal_ull(m, g ? " " : "", | |
7994 | from_kgid_munged(uns, gi->gid[g])); | |
7995 | } | |
7996 | seq_puts(m, "\n\tCapEff:\t"); | |
7997 | cap = cred->cap_effective; | |
7998 | CAP_FOR_EACH_U32(__capi) | |
7999 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8000 | seq_putc(m, '\n'); | |
8001 | return 0; | |
8002 | } | |
8003 | ||
8004 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8005 | { | |
8006 | int i; | |
8007 | ||
8008 | mutex_lock(&ctx->uring_lock); | |
8009 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
8010 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8011 | struct fixed_file_table *table; | |
8012 | struct file *f; | |
8013 | ||
8014 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8015 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8016 | if (f) | |
8017 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8018 | else | |
8019 | seq_printf(m, "%5u: <none>\n", i); | |
8020 | } | |
8021 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
8022 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8023 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
8024 | ||
8025 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8026 | (unsigned int) buf->len); | |
8027 | } | |
8028 | if (!idr_is_empty(&ctx->personality_idr)) { | |
8029 | seq_printf(m, "Personalities:\n"); | |
8030 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8031 | } | |
d7718a9d JA |
8032 | seq_printf(m, "PollList:\n"); |
8033 | spin_lock_irq(&ctx->completion_lock); | |
8034 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8035 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8036 | struct io_kiocb *req; | |
8037 | ||
8038 | hlist_for_each_entry(req, list, hash_node) | |
8039 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8040 | req->task->task_works != NULL); | |
8041 | } | |
8042 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
8043 | mutex_unlock(&ctx->uring_lock); |
8044 | } | |
8045 | ||
8046 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8047 | { | |
8048 | struct io_ring_ctx *ctx = f->private_data; | |
8049 | ||
8050 | if (percpu_ref_tryget(&ctx->refs)) { | |
8051 | __io_uring_show_fdinfo(ctx, m); | |
8052 | percpu_ref_put(&ctx->refs); | |
8053 | } | |
8054 | } | |
bebdb65e | 8055 | #endif |
87ce955b | 8056 | |
2b188cc1 JA |
8057 | static const struct file_operations io_uring_fops = { |
8058 | .release = io_uring_release, | |
fcb323cc | 8059 | .flush = io_uring_flush, |
2b188cc1 | 8060 | .mmap = io_uring_mmap, |
6c5c240e RP |
8061 | #ifndef CONFIG_MMU |
8062 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8063 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8064 | #endif | |
2b188cc1 JA |
8065 | .poll = io_uring_poll, |
8066 | .fasync = io_uring_fasync, | |
bebdb65e | 8067 | #ifdef CONFIG_PROC_FS |
87ce955b | 8068 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8069 | #endif |
2b188cc1 JA |
8070 | }; |
8071 | ||
8072 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8073 | struct io_uring_params *p) | |
8074 | { | |
75b28aff HV |
8075 | struct io_rings *rings; |
8076 | size_t size, sq_array_offset; | |
2b188cc1 | 8077 | |
75b28aff HV |
8078 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8079 | if (size == SIZE_MAX) | |
8080 | return -EOVERFLOW; | |
8081 | ||
8082 | rings = io_mem_alloc(size); | |
8083 | if (!rings) | |
2b188cc1 JA |
8084 | return -ENOMEM; |
8085 | ||
75b28aff HV |
8086 | ctx->rings = rings; |
8087 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8088 | rings->sq_ring_mask = p->sq_entries - 1; | |
8089 | rings->cq_ring_mask = p->cq_entries - 1; | |
8090 | rings->sq_ring_entries = p->sq_entries; | |
8091 | rings->cq_ring_entries = p->cq_entries; | |
8092 | ctx->sq_mask = rings->sq_ring_mask; | |
8093 | ctx->cq_mask = rings->cq_ring_mask; | |
8094 | ctx->sq_entries = rings->sq_ring_entries; | |
8095 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
8096 | |
8097 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8098 | if (size == SIZE_MAX) { |
8099 | io_mem_free(ctx->rings); | |
8100 | ctx->rings = NULL; | |
2b188cc1 | 8101 | return -EOVERFLOW; |
eb065d30 | 8102 | } |
2b188cc1 JA |
8103 | |
8104 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8105 | if (!ctx->sq_sqes) { |
8106 | io_mem_free(ctx->rings); | |
8107 | ctx->rings = NULL; | |
2b188cc1 | 8108 | return -ENOMEM; |
eb065d30 | 8109 | } |
2b188cc1 | 8110 | |
2b188cc1 JA |
8111 | return 0; |
8112 | } | |
8113 | ||
8114 | /* | |
8115 | * Allocate an anonymous fd, this is what constitutes the application | |
8116 | * visible backing of an io_uring instance. The application mmaps this | |
8117 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8118 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8119 | */ | |
8120 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8121 | { | |
8122 | struct file *file; | |
8123 | int ret; | |
8124 | ||
8125 | #if defined(CONFIG_UNIX) | |
8126 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8127 | &ctx->ring_sock); | |
8128 | if (ret) | |
8129 | return ret; | |
8130 | #endif | |
8131 | ||
8132 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8133 | if (ret < 0) | |
8134 | goto err; | |
8135 | ||
8136 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8137 | O_RDWR | O_CLOEXEC); | |
8138 | if (IS_ERR(file)) { | |
8139 | put_unused_fd(ret); | |
8140 | ret = PTR_ERR(file); | |
8141 | goto err; | |
8142 | } | |
8143 | ||
8144 | #if defined(CONFIG_UNIX) | |
8145 | ctx->ring_sock->file = file; | |
8146 | #endif | |
8147 | fd_install(ret, file); | |
8148 | return ret; | |
8149 | err: | |
8150 | #if defined(CONFIG_UNIX) | |
8151 | sock_release(ctx->ring_sock); | |
8152 | ctx->ring_sock = NULL; | |
8153 | #endif | |
8154 | return ret; | |
8155 | } | |
8156 | ||
7f13657d XW |
8157 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8158 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8159 | { |
8160 | struct user_struct *user = NULL; | |
8161 | struct io_ring_ctx *ctx; | |
aad5d8da | 8162 | bool limit_mem; |
2b188cc1 JA |
8163 | int ret; |
8164 | ||
8110c1a6 | 8165 | if (!entries) |
2b188cc1 | 8166 | return -EINVAL; |
8110c1a6 JA |
8167 | if (entries > IORING_MAX_ENTRIES) { |
8168 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8169 | return -EINVAL; | |
8170 | entries = IORING_MAX_ENTRIES; | |
8171 | } | |
2b188cc1 JA |
8172 | |
8173 | /* | |
8174 | * Use twice as many entries for the CQ ring. It's possible for the | |
8175 | * application to drive a higher depth than the size of the SQ ring, | |
8176 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8177 | * some flexibility in overcommitting a bit. If the application has |
8178 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8179 | * of CQ ring entries manually. | |
2b188cc1 JA |
8180 | */ |
8181 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8182 | if (p->flags & IORING_SETUP_CQSIZE) { |
8183 | /* | |
8184 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8185 | * to a power-of-two, if it isn't already. We do NOT impose | |
8186 | * any cq vs sq ring sizing. | |
8187 | */ | |
8110c1a6 | 8188 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8189 | return -EINVAL; |
8110c1a6 JA |
8190 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8191 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8192 | return -EINVAL; | |
8193 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8194 | } | |
33a107f0 JA |
8195 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8196 | } else { | |
8197 | p->cq_entries = 2 * p->sq_entries; | |
8198 | } | |
2b188cc1 JA |
8199 | |
8200 | user = get_uid(current_user()); | |
aad5d8da | 8201 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8202 | |
aad5d8da | 8203 | if (limit_mem) { |
a087e2b5 | 8204 | ret = __io_account_mem(user, |
2b188cc1 JA |
8205 | ring_pages(p->sq_entries, p->cq_entries)); |
8206 | if (ret) { | |
8207 | free_uid(user); | |
8208 | return ret; | |
8209 | } | |
8210 | } | |
8211 | ||
8212 | ctx = io_ring_ctx_alloc(p); | |
8213 | if (!ctx) { | |
aad5d8da | 8214 | if (limit_mem) |
a087e2b5 | 8215 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8216 | p->cq_entries)); |
8217 | free_uid(user); | |
8218 | return -ENOMEM; | |
8219 | } | |
8220 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8221 | ctx->user = user; |
0b8c0ec7 | 8222 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
8223 | |
8224 | ret = io_allocate_scq_urings(ctx, p); | |
8225 | if (ret) | |
8226 | goto err; | |
8227 | ||
6c271ce2 | 8228 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8229 | if (ret) |
8230 | goto err; | |
8231 | ||
2b188cc1 | 8232 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8233 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8234 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8235 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8236 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8237 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8238 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8239 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8240 | |
8241 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8242 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8243 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8244 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8245 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8246 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8247 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8248 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8249 | |
7f13657d XW |
8250 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8251 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8252 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8253 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8254 | |
8255 | if (copy_to_user(params, p, sizeof(*p))) { | |
8256 | ret = -EFAULT; | |
8257 | goto err; | |
8258 | } | |
044c1ab3 JA |
8259 | /* |
8260 | * Install ring fd as the very last thing, so we don't risk someone | |
8261 | * having closed it before we finish setup | |
8262 | */ | |
8263 | ret = io_uring_get_fd(ctx); | |
8264 | if (ret < 0) | |
8265 | goto err; | |
8266 | ||
c826bd7a | 8267 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2e0464d4 BM |
8268 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), |
8269 | ACCT_LOCKED); | |
30975825 | 8270 | ctx->limit_mem = limit_mem; |
2b188cc1 JA |
8271 | return ret; |
8272 | err: | |
8273 | io_ring_ctx_wait_and_kill(ctx); | |
8274 | return ret; | |
8275 | } | |
8276 | ||
8277 | /* | |
8278 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8279 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8280 | * params structure passed in. | |
8281 | */ | |
8282 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8283 | { | |
8284 | struct io_uring_params p; | |
2b188cc1 JA |
8285 | int i; |
8286 | ||
8287 | if (copy_from_user(&p, params, sizeof(p))) | |
8288 | return -EFAULT; | |
8289 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8290 | if (p.resv[i]) | |
8291 | return -EINVAL; | |
8292 | } | |
8293 | ||
6c271ce2 | 8294 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 8295 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 8296 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
8297 | return -EINVAL; |
8298 | ||
7f13657d | 8299 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
8300 | } |
8301 | ||
8302 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
8303 | struct io_uring_params __user *, params) | |
8304 | { | |
8305 | return io_uring_setup(entries, params); | |
8306 | } | |
8307 | ||
66f4af93 JA |
8308 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
8309 | { | |
8310 | struct io_uring_probe *p; | |
8311 | size_t size; | |
8312 | int i, ret; | |
8313 | ||
8314 | size = struct_size(p, ops, nr_args); | |
8315 | if (size == SIZE_MAX) | |
8316 | return -EOVERFLOW; | |
8317 | p = kzalloc(size, GFP_KERNEL); | |
8318 | if (!p) | |
8319 | return -ENOMEM; | |
8320 | ||
8321 | ret = -EFAULT; | |
8322 | if (copy_from_user(p, arg, size)) | |
8323 | goto out; | |
8324 | ret = -EINVAL; | |
8325 | if (memchr_inv(p, 0, size)) | |
8326 | goto out; | |
8327 | ||
8328 | p->last_op = IORING_OP_LAST - 1; | |
8329 | if (nr_args > IORING_OP_LAST) | |
8330 | nr_args = IORING_OP_LAST; | |
8331 | ||
8332 | for (i = 0; i < nr_args; i++) { | |
8333 | p->ops[i].op = i; | |
8334 | if (!io_op_defs[i].not_supported) | |
8335 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8336 | } | |
8337 | p->ops_len = i; | |
8338 | ||
8339 | ret = 0; | |
8340 | if (copy_to_user(arg, p, size)) | |
8341 | ret = -EFAULT; | |
8342 | out: | |
8343 | kfree(p); | |
8344 | return ret; | |
8345 | } | |
8346 | ||
071698e1 JA |
8347 | static int io_register_personality(struct io_ring_ctx *ctx) |
8348 | { | |
8349 | const struct cred *creds = get_current_cred(); | |
8350 | int id; | |
8351 | ||
8352 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8353 | USHRT_MAX, GFP_KERNEL); | |
8354 | if (id < 0) | |
8355 | put_cred(creds); | |
8356 | return id; | |
8357 | } | |
8358 | ||
8359 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8360 | { | |
8361 | const struct cred *old_creds; | |
8362 | ||
8363 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8364 | if (old_creds) { | |
8365 | put_cred(old_creds); | |
8366 | return 0; | |
8367 | } | |
8368 | ||
8369 | return -EINVAL; | |
8370 | } | |
8371 | ||
8372 | static bool io_register_op_must_quiesce(int op) | |
8373 | { | |
8374 | switch (op) { | |
8375 | case IORING_UNREGISTER_FILES: | |
8376 | case IORING_REGISTER_FILES_UPDATE: | |
8377 | case IORING_REGISTER_PROBE: | |
8378 | case IORING_REGISTER_PERSONALITY: | |
8379 | case IORING_UNREGISTER_PERSONALITY: | |
8380 | return false; | |
8381 | default: | |
8382 | return true; | |
8383 | } | |
8384 | } | |
8385 | ||
edafccee JA |
8386 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8387 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8388 | __releases(ctx->uring_lock) |
8389 | __acquires(ctx->uring_lock) | |
edafccee JA |
8390 | { |
8391 | int ret; | |
8392 | ||
35fa71a0 JA |
8393 | /* |
8394 | * We're inside the ring mutex, if the ref is already dying, then | |
8395 | * someone else killed the ctx or is already going through | |
8396 | * io_uring_register(). | |
8397 | */ | |
8398 | if (percpu_ref_is_dying(&ctx->refs)) | |
8399 | return -ENXIO; | |
8400 | ||
071698e1 | 8401 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8402 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8403 | |
05f3fb3c JA |
8404 | /* |
8405 | * Drop uring mutex before waiting for references to exit. If | |
8406 | * another thread is currently inside io_uring_enter() it might | |
8407 | * need to grab the uring_lock to make progress. If we hold it | |
8408 | * here across the drain wait, then we can deadlock. It's safe | |
8409 | * to drop the mutex here, since no new references will come in | |
8410 | * after we've killed the percpu ref. | |
8411 | */ | |
8412 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8413 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8414 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8415 | if (ret) { |
8416 | percpu_ref_resurrect(&ctx->refs); | |
8417 | ret = -EINTR; | |
8418 | goto out; | |
8419 | } | |
05f3fb3c | 8420 | } |
edafccee JA |
8421 | |
8422 | switch (opcode) { | |
8423 | case IORING_REGISTER_BUFFERS: | |
8424 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8425 | break; | |
8426 | case IORING_UNREGISTER_BUFFERS: | |
8427 | ret = -EINVAL; | |
8428 | if (arg || nr_args) | |
8429 | break; | |
8430 | ret = io_sqe_buffer_unregister(ctx); | |
8431 | break; | |
6b06314c JA |
8432 | case IORING_REGISTER_FILES: |
8433 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8434 | break; | |
8435 | case IORING_UNREGISTER_FILES: | |
8436 | ret = -EINVAL; | |
8437 | if (arg || nr_args) | |
8438 | break; | |
8439 | ret = io_sqe_files_unregister(ctx); | |
8440 | break; | |
c3a31e60 JA |
8441 | case IORING_REGISTER_FILES_UPDATE: |
8442 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8443 | break; | |
9b402849 | 8444 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8445 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8446 | ret = -EINVAL; |
8447 | if (nr_args != 1) | |
8448 | break; | |
8449 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8450 | if (ret) |
8451 | break; | |
8452 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8453 | ctx->eventfd_async = 1; | |
8454 | else | |
8455 | ctx->eventfd_async = 0; | |
9b402849 JA |
8456 | break; |
8457 | case IORING_UNREGISTER_EVENTFD: | |
8458 | ret = -EINVAL; | |
8459 | if (arg || nr_args) | |
8460 | break; | |
8461 | ret = io_eventfd_unregister(ctx); | |
8462 | break; | |
66f4af93 JA |
8463 | case IORING_REGISTER_PROBE: |
8464 | ret = -EINVAL; | |
8465 | if (!arg || nr_args > 256) | |
8466 | break; | |
8467 | ret = io_probe(ctx, arg, nr_args); | |
8468 | break; | |
071698e1 JA |
8469 | case IORING_REGISTER_PERSONALITY: |
8470 | ret = -EINVAL; | |
8471 | if (arg || nr_args) | |
8472 | break; | |
8473 | ret = io_register_personality(ctx); | |
8474 | break; | |
8475 | case IORING_UNREGISTER_PERSONALITY: | |
8476 | ret = -EINVAL; | |
8477 | if (arg) | |
8478 | break; | |
8479 | ret = io_unregister_personality(ctx, nr_args); | |
8480 | break; | |
edafccee JA |
8481 | default: |
8482 | ret = -EINVAL; | |
8483 | break; | |
8484 | } | |
8485 | ||
071698e1 | 8486 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8487 | /* bring the ctx back to life */ |
05f3fb3c | 8488 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8489 | out: |
0f158b4c | 8490 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8491 | } |
edafccee JA |
8492 | return ret; |
8493 | } | |
8494 | ||
8495 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8496 | void __user *, arg, unsigned int, nr_args) | |
8497 | { | |
8498 | struct io_ring_ctx *ctx; | |
8499 | long ret = -EBADF; | |
8500 | struct fd f; | |
8501 | ||
8502 | f = fdget(fd); | |
8503 | if (!f.file) | |
8504 | return -EBADF; | |
8505 | ||
8506 | ret = -EOPNOTSUPP; | |
8507 | if (f.file->f_op != &io_uring_fops) | |
8508 | goto out_fput; | |
8509 | ||
8510 | ctx = f.file->private_data; | |
8511 | ||
8512 | mutex_lock(&ctx->uring_lock); | |
8513 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8514 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8515 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8516 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8517 | out_fput: |
8518 | fdput(f); | |
8519 | return ret; | |
8520 | } | |
8521 | ||
2b188cc1 JA |
8522 | static int __init io_uring_init(void) |
8523 | { | |
d7f62e82 SM |
8524 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8525 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8526 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8527 | } while (0) | |
8528 | ||
8529 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8530 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8531 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8532 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8533 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8534 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8535 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8536 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8537 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8538 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8539 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8540 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8541 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8542 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8543 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8544 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
8545 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
8546 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
8547 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
8548 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8549 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8550 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8551 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8552 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8553 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8554 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8555 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8556 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8557 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8558 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8559 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8560 | |
d3656344 | 8561 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8562 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8563 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8564 | return 0; | |
8565 | }; | |
8566 | __initcall(io_uring_init); |