Commit | Line | Data |
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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
14 | * through a control-dependency in io_get_cqring (smp_store_release to | |
15 | * store head will do). Failure to do so could lead to reading invalid | |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
58 | #include <linux/mmu_context.h> | |
59 | #include <linux/percpu.h> | |
60 | #include <linux/slab.h> | |
6c271ce2 | 61 | #include <linux/kthread.h> |
2b188cc1 | 62 | #include <linux/blkdev.h> |
edafccee | 63 | #include <linux/bvec.h> |
2b188cc1 JA |
64 | #include <linux/net.h> |
65 | #include <net/sock.h> | |
66 | #include <net/af_unix.h> | |
6b06314c | 67 | #include <net/scm.h> |
2b188cc1 JA |
68 | #include <linux/anon_inodes.h> |
69 | #include <linux/sched/mm.h> | |
70 | #include <linux/uaccess.h> | |
71 | #include <linux/nospec.h> | |
edafccee JA |
72 | #include <linux/sizes.h> |
73 | #include <linux/hugetlb.h> | |
aa4c3967 | 74 | #include <linux/highmem.h> |
15b71abe JA |
75 | #include <linux/namei.h> |
76 | #include <linux/fsnotify.h> | |
4840e418 | 77 | #include <linux/fadvise.h> |
3e4827b0 | 78 | #include <linux/eventpoll.h> |
ff002b30 | 79 | #include <linux/fs_struct.h> |
7d67af2c | 80 | #include <linux/splice.h> |
b41e9852 | 81 | #include <linux/task_work.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 RD |
229 | unsigned int compat: 1; |
230 | unsigned int account_mem: 1; | |
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; | |
507 | }; | |
508 | ||
1a6b74fc | 509 | struct io_async_ctx { |
f67676d1 JA |
510 | union { |
511 | struct io_async_rw rw; | |
03b1230c | 512 | struct io_async_msghdr msg; |
f499a021 | 513 | struct io_async_connect connect; |
2d28390a | 514 | struct io_timeout_data timeout; |
f67676d1 | 515 | }; |
1a6b74fc JA |
516 | }; |
517 | ||
6b47ee6e PB |
518 | enum { |
519 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
520 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
521 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
522 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
523 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 524 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 525 | |
dea3b49c | 526 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
527 | REQ_F_LINK_NEXT_BIT, |
528 | REQ_F_FAIL_LINK_BIT, | |
529 | REQ_F_INFLIGHT_BIT, | |
530 | REQ_F_CUR_POS_BIT, | |
531 | REQ_F_NOWAIT_BIT, | |
532 | REQ_F_IOPOLL_COMPLETED_BIT, | |
533 | REQ_F_LINK_TIMEOUT_BIT, | |
534 | REQ_F_TIMEOUT_BIT, | |
535 | REQ_F_ISREG_BIT, | |
536 | REQ_F_MUST_PUNT_BIT, | |
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, |
84557871 JA |
544 | |
545 | /* not a real bit, just to check we're not overflowing the space */ | |
546 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
547 | }; |
548 | ||
549 | enum { | |
550 | /* ctx owns file */ | |
551 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
552 | /* drain existing IO first */ | |
553 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
554 | /* linked sqes */ | |
555 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
556 | /* doesn't sever on completion < 0 */ | |
557 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
558 | /* IOSQE_ASYNC */ | |
559 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
560 | /* IOSQE_BUFFER_SELECT */ |
561 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 562 | |
dea3b49c PB |
563 | /* head of a link */ |
564 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
565 | /* already grabbed next link */ |
566 | REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), | |
567 | /* fail rest of links */ | |
568 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
569 | /* on inflight list */ | |
570 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
571 | /* read/write uses file position */ | |
572 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
573 | /* must not punt to workers */ | |
574 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
575 | /* polled IO has completed */ | |
576 | REQ_F_IOPOLL_COMPLETED = BIT(REQ_F_IOPOLL_COMPLETED_BIT), | |
577 | /* has linked timeout */ | |
578 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
579 | /* timeout request */ | |
580 | REQ_F_TIMEOUT = BIT(REQ_F_TIMEOUT_BIT), | |
581 | /* regular file */ | |
582 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
583 | /* must be punted even for NONBLOCK */ | |
584 | REQ_F_MUST_PUNT = BIT(REQ_F_MUST_PUNT_BIT), | |
585 | /* no timeout sequence */ | |
586 | REQ_F_TIMEOUT_NOSEQ = BIT(REQ_F_TIMEOUT_NOSEQ_BIT), | |
587 | /* completion under lock */ | |
588 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
589 | /* needs cleanup */ |
590 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
591 | /* in overflow list */ |
592 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
593 | /* already went through poll handler */ |
594 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
595 | /* buffer already selected */ |
596 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
597 | /* doesn't need file table for this request */ |
598 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
d7718a9d JA |
599 | }; |
600 | ||
601 | struct async_poll { | |
602 | struct io_poll_iocb poll; | |
603 | struct io_wq_work work; | |
6b47ee6e PB |
604 | }; |
605 | ||
09bb8394 JA |
606 | /* |
607 | * NOTE! Each of the iocb union members has the file pointer | |
608 | * as the first entry in their struct definition. So you can | |
609 | * access the file pointer through any of the sub-structs, | |
610 | * or directly as just 'ki_filp' in this struct. | |
611 | */ | |
2b188cc1 | 612 | struct io_kiocb { |
221c5eb2 | 613 | union { |
09bb8394 | 614 | struct file *file; |
9adbd45d | 615 | struct io_rw rw; |
221c5eb2 | 616 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
617 | struct io_accept accept; |
618 | struct io_sync sync; | |
fbf23849 | 619 | struct io_cancel cancel; |
b29472ee | 620 | struct io_timeout timeout; |
3fbb51c1 | 621 | struct io_connect connect; |
e47293fd | 622 | struct io_sr_msg sr_msg; |
15b71abe | 623 | struct io_open open; |
b5dba59e | 624 | struct io_close close; |
05f3fb3c | 625 | struct io_files_update files_update; |
4840e418 | 626 | struct io_fadvise fadvise; |
c1ca757b | 627 | struct io_madvise madvise; |
3e4827b0 | 628 | struct io_epoll epoll; |
7d67af2c | 629 | struct io_splice splice; |
ddf0322d | 630 | struct io_provide_buf pbuf; |
1d9e1288 | 631 | struct io_statx statx; |
221c5eb2 | 632 | }; |
2b188cc1 | 633 | |
1a6b74fc | 634 | struct io_async_ctx *io; |
c398ecb3 | 635 | int cflags; |
d625c6ee | 636 | u8 opcode; |
2b188cc1 | 637 | |
4f4eeba8 BM |
638 | u16 buf_index; |
639 | ||
2b188cc1 | 640 | struct io_ring_ctx *ctx; |
d7718a9d | 641 | struct list_head list; |
2b188cc1 | 642 | unsigned int flags; |
c16361c1 | 643 | refcount_t refs; |
3537b6a7 JA |
644 | struct task_struct *task; |
645 | unsigned long fsize; | |
2b188cc1 | 646 | u64 user_data; |
9e645e11 | 647 | u32 result; |
de0617e4 | 648 | u32 sequence; |
2b188cc1 | 649 | |
d7718a9d JA |
650 | struct list_head link_list; |
651 | ||
fcb323cc JA |
652 | struct list_head inflight_entry; |
653 | ||
05589553 XW |
654 | struct percpu_ref *fixed_file_refs; |
655 | ||
b41e9852 JA |
656 | union { |
657 | /* | |
658 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
659 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
660 | * async armed poll handlers for regular commands. The latter | |
661 | * restore the work, if needed. | |
b41e9852 JA |
662 | */ |
663 | struct { | |
b41e9852 | 664 | struct callback_head task_work; |
d7718a9d JA |
665 | struct hlist_node hash_node; |
666 | struct async_poll *apoll; | |
b41e9852 JA |
667 | }; |
668 | struct io_wq_work work; | |
669 | }; | |
2b188cc1 JA |
670 | }; |
671 | ||
672 | #define IO_PLUG_THRESHOLD 2 | |
def596e9 | 673 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 674 | |
9a56a232 JA |
675 | struct io_submit_state { |
676 | struct blk_plug plug; | |
677 | ||
2579f913 JA |
678 | /* |
679 | * io_kiocb alloc cache | |
680 | */ | |
681 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 682 | unsigned int free_reqs; |
2579f913 | 683 | |
9a56a232 JA |
684 | /* |
685 | * File reference cache | |
686 | */ | |
687 | struct file *file; | |
688 | unsigned int fd; | |
689 | unsigned int has_refs; | |
690 | unsigned int used_refs; | |
691 | unsigned int ios_left; | |
692 | }; | |
693 | ||
d3656344 JA |
694 | struct io_op_def { |
695 | /* needs req->io allocated for deferral/async */ | |
696 | unsigned async_ctx : 1; | |
697 | /* needs current->mm setup, does mm access */ | |
698 | unsigned needs_mm : 1; | |
699 | /* needs req->file assigned */ | |
700 | unsigned needs_file : 1; | |
fd2206e4 JA |
701 | /* don't fail if file grab fails */ |
702 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
703 | /* hash wq insertion if file is a regular file */ |
704 | unsigned hash_reg_file : 1; | |
705 | /* unbound wq insertion if file is a non-regular file */ | |
706 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
707 | /* opcode is not supported by this kernel */ |
708 | unsigned not_supported : 1; | |
f86cd20c JA |
709 | /* needs file table */ |
710 | unsigned file_table : 1; | |
ff002b30 JA |
711 | /* needs ->fs */ |
712 | unsigned needs_fs : 1; | |
8a72758c JA |
713 | /* set if opcode supports polled "wait" */ |
714 | unsigned pollin : 1; | |
715 | unsigned pollout : 1; | |
bcda7baa JA |
716 | /* op supports buffer selection */ |
717 | unsigned buffer_select : 1; | |
d3656344 JA |
718 | }; |
719 | ||
720 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
721 | [IORING_OP_NOP] = {}, |
722 | [IORING_OP_READV] = { | |
d3656344 JA |
723 | .async_ctx = 1, |
724 | .needs_mm = 1, | |
725 | .needs_file = 1, | |
726 | .unbound_nonreg_file = 1, | |
8a72758c | 727 | .pollin = 1, |
4d954c25 | 728 | .buffer_select = 1, |
d3656344 | 729 | }, |
0463b6c5 | 730 | [IORING_OP_WRITEV] = { |
d3656344 JA |
731 | .async_ctx = 1, |
732 | .needs_mm = 1, | |
733 | .needs_file = 1, | |
734 | .hash_reg_file = 1, | |
735 | .unbound_nonreg_file = 1, | |
8a72758c | 736 | .pollout = 1, |
d3656344 | 737 | }, |
0463b6c5 | 738 | [IORING_OP_FSYNC] = { |
d3656344 JA |
739 | .needs_file = 1, |
740 | }, | |
0463b6c5 | 741 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
742 | .needs_file = 1, |
743 | .unbound_nonreg_file = 1, | |
8a72758c | 744 | .pollin = 1, |
d3656344 | 745 | }, |
0463b6c5 | 746 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
747 | .needs_file = 1, |
748 | .hash_reg_file = 1, | |
749 | .unbound_nonreg_file = 1, | |
8a72758c | 750 | .pollout = 1, |
d3656344 | 751 | }, |
0463b6c5 | 752 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
753 | .needs_file = 1, |
754 | .unbound_nonreg_file = 1, | |
755 | }, | |
0463b6c5 PB |
756 | [IORING_OP_POLL_REMOVE] = {}, |
757 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
758 | .needs_file = 1, |
759 | }, | |
0463b6c5 | 760 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
761 | .async_ctx = 1, |
762 | .needs_mm = 1, | |
763 | .needs_file = 1, | |
764 | .unbound_nonreg_file = 1, | |
ff002b30 | 765 | .needs_fs = 1, |
8a72758c | 766 | .pollout = 1, |
d3656344 | 767 | }, |
0463b6c5 | 768 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
769 | .async_ctx = 1, |
770 | .needs_mm = 1, | |
771 | .needs_file = 1, | |
772 | .unbound_nonreg_file = 1, | |
ff002b30 | 773 | .needs_fs = 1, |
8a72758c | 774 | .pollin = 1, |
52de1fe1 | 775 | .buffer_select = 1, |
d3656344 | 776 | }, |
0463b6c5 | 777 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
778 | .async_ctx = 1, |
779 | .needs_mm = 1, | |
780 | }, | |
0463b6c5 PB |
781 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
782 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
783 | .needs_mm = 1, |
784 | .needs_file = 1, | |
785 | .unbound_nonreg_file = 1, | |
f86cd20c | 786 | .file_table = 1, |
8a72758c | 787 | .pollin = 1, |
d3656344 | 788 | }, |
0463b6c5 PB |
789 | [IORING_OP_ASYNC_CANCEL] = {}, |
790 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
791 | .async_ctx = 1, |
792 | .needs_mm = 1, | |
793 | }, | |
0463b6c5 | 794 | [IORING_OP_CONNECT] = { |
d3656344 JA |
795 | .async_ctx = 1, |
796 | .needs_mm = 1, | |
797 | .needs_file = 1, | |
798 | .unbound_nonreg_file = 1, | |
8a72758c | 799 | .pollout = 1, |
d3656344 | 800 | }, |
0463b6c5 | 801 | [IORING_OP_FALLOCATE] = { |
d3656344 JA |
802 | .needs_file = 1, |
803 | }, | |
0463b6c5 | 804 | [IORING_OP_OPENAT] = { |
f86cd20c | 805 | .file_table = 1, |
ff002b30 | 806 | .needs_fs = 1, |
d3656344 | 807 | }, |
0463b6c5 | 808 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
809 | .needs_file = 1, |
810 | .needs_file_no_error = 1, | |
f86cd20c | 811 | .file_table = 1, |
d3656344 | 812 | }, |
0463b6c5 | 813 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 814 | .needs_mm = 1, |
f86cd20c | 815 | .file_table = 1, |
d3656344 | 816 | }, |
0463b6c5 | 817 | [IORING_OP_STATX] = { |
d3656344 | 818 | .needs_mm = 1, |
ff002b30 | 819 | .needs_fs = 1, |
5b0bbee4 | 820 | .file_table = 1, |
d3656344 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_READ] = { |
3a6820f2 JA |
823 | .needs_mm = 1, |
824 | .needs_file = 1, | |
825 | .unbound_nonreg_file = 1, | |
8a72758c | 826 | .pollin = 1, |
bcda7baa | 827 | .buffer_select = 1, |
3a6820f2 | 828 | }, |
0463b6c5 | 829 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
830 | .needs_mm = 1, |
831 | .needs_file = 1, | |
832 | .unbound_nonreg_file = 1, | |
8a72758c | 833 | .pollout = 1, |
3a6820f2 | 834 | }, |
0463b6c5 | 835 | [IORING_OP_FADVISE] = { |
4840e418 JA |
836 | .needs_file = 1, |
837 | }, | |
0463b6c5 | 838 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
839 | .needs_mm = 1, |
840 | }, | |
0463b6c5 | 841 | [IORING_OP_SEND] = { |
fddaface JA |
842 | .needs_mm = 1, |
843 | .needs_file = 1, | |
844 | .unbound_nonreg_file = 1, | |
8a72758c | 845 | .pollout = 1, |
fddaface | 846 | }, |
0463b6c5 | 847 | [IORING_OP_RECV] = { |
fddaface JA |
848 | .needs_mm = 1, |
849 | .needs_file = 1, | |
850 | .unbound_nonreg_file = 1, | |
8a72758c | 851 | .pollin = 1, |
bcda7baa | 852 | .buffer_select = 1, |
fddaface | 853 | }, |
0463b6c5 | 854 | [IORING_OP_OPENAT2] = { |
f86cd20c | 855 | .file_table = 1, |
ff002b30 | 856 | .needs_fs = 1, |
cebdb986 | 857 | }, |
3e4827b0 JA |
858 | [IORING_OP_EPOLL_CTL] = { |
859 | .unbound_nonreg_file = 1, | |
860 | .file_table = 1, | |
861 | }, | |
7d67af2c PB |
862 | [IORING_OP_SPLICE] = { |
863 | .needs_file = 1, | |
864 | .hash_reg_file = 1, | |
865 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
866 | }, |
867 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 868 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
869 | [IORING_OP_TEE] = { |
870 | .needs_file = 1, | |
871 | .hash_reg_file = 1, | |
872 | .unbound_nonreg_file = 1, | |
873 | }, | |
d3656344 JA |
874 | }; |
875 | ||
561fb04a | 876 | static void io_wq_submit_work(struct io_wq_work **workptr); |
78e19bbe | 877 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 878 | static void io_put_req(struct io_kiocb *req); |
978db57e | 879 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
880 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
881 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
882 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
883 | struct io_uring_files_update *ip, | |
884 | unsigned nr_args); | |
f86cd20c | 885 | static int io_grab_files(struct io_kiocb *req); |
99bc4c38 | 886 | static void io_cleanup_req(struct io_kiocb *req); |
b41e9852 JA |
887 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
888 | int fd, struct file **out_file, bool fixed); | |
889 | static void __io_queue_sqe(struct io_kiocb *req, | |
890 | const struct io_uring_sqe *sqe); | |
de0617e4 | 891 | |
2b188cc1 JA |
892 | static struct kmem_cache *req_cachep; |
893 | ||
894 | static const struct file_operations io_uring_fops; | |
895 | ||
896 | struct sock *io_uring_get_socket(struct file *file) | |
897 | { | |
898 | #if defined(CONFIG_UNIX) | |
899 | if (file->f_op == &io_uring_fops) { | |
900 | struct io_ring_ctx *ctx = file->private_data; | |
901 | ||
902 | return ctx->ring_sock->sk; | |
903 | } | |
904 | #endif | |
905 | return NULL; | |
906 | } | |
907 | EXPORT_SYMBOL(io_uring_get_socket); | |
908 | ||
4a38aed2 JA |
909 | static void io_file_put_work(struct work_struct *work); |
910 | ||
0cdaf760 PB |
911 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
912 | { | |
913 | return ctx->flags & IORING_SETUP_SQPOLL; | |
914 | } | |
915 | ||
2b188cc1 JA |
916 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
917 | { | |
918 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
919 | ||
0f158b4c | 920 | complete(&ctx->ref_comp); |
2b188cc1 JA |
921 | } |
922 | ||
923 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) | |
924 | { | |
925 | struct io_ring_ctx *ctx; | |
78076bb6 | 926 | int hash_bits; |
2b188cc1 JA |
927 | |
928 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
929 | if (!ctx) | |
930 | return NULL; | |
931 | ||
0ddf92e8 JA |
932 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
933 | if (!ctx->fallback_req) | |
934 | goto err; | |
935 | ||
78076bb6 JA |
936 | /* |
937 | * Use 5 bits less than the max cq entries, that should give us around | |
938 | * 32 entries per hash list if totally full and uniformly spread. | |
939 | */ | |
940 | hash_bits = ilog2(p->cq_entries); | |
941 | hash_bits -= 5; | |
942 | if (hash_bits <= 0) | |
943 | hash_bits = 1; | |
944 | ctx->cancel_hash_bits = hash_bits; | |
945 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
946 | GFP_KERNEL); | |
947 | if (!ctx->cancel_hash) | |
948 | goto err; | |
949 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
950 | ||
21482896 | 951 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
952 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
953 | goto err; | |
2b188cc1 JA |
954 | |
955 | ctx->flags = p->flags; | |
583863ed | 956 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 957 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 958 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
959 | init_completion(&ctx->ref_comp); |
960 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 961 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 962 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
963 | mutex_init(&ctx->uring_lock); |
964 | init_waitqueue_head(&ctx->wait); | |
965 | spin_lock_init(&ctx->completion_lock); | |
def596e9 | 966 | INIT_LIST_HEAD(&ctx->poll_list); |
de0617e4 | 967 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 968 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
969 | init_waitqueue_head(&ctx->inflight_wait); |
970 | spin_lock_init(&ctx->inflight_lock); | |
971 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
972 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
973 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 974 | return ctx; |
206aefde | 975 | err: |
0ddf92e8 JA |
976 | if (ctx->fallback_req) |
977 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 978 | kfree(ctx->cancel_hash); |
206aefde JA |
979 | kfree(ctx); |
980 | return NULL; | |
2b188cc1 JA |
981 | } |
982 | ||
9d858b21 | 983 | static inline bool __req_need_defer(struct io_kiocb *req) |
7adf4eaf | 984 | { |
a197f664 JL |
985 | struct io_ring_ctx *ctx = req->ctx; |
986 | ||
31af27c7 PB |
987 | return req->sequence != ctx->cached_cq_tail |
988 | + atomic_read(&ctx->cached_cq_overflow); | |
7adf4eaf JA |
989 | } |
990 | ||
9d858b21 | 991 | static inline bool req_need_defer(struct io_kiocb *req) |
de0617e4 | 992 | { |
87987898 | 993 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) |
9d858b21 | 994 | return __req_need_defer(req); |
de0617e4 | 995 | |
9d858b21 | 996 | return false; |
de0617e4 JA |
997 | } |
998 | ||
de0617e4 | 999 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1000 | { |
75b28aff | 1001 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1002 | |
07910158 PB |
1003 | /* order cqe stores with ring update */ |
1004 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1005 | |
07910158 PB |
1006 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1007 | wake_up_interruptible(&ctx->cq_wait); | |
1008 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1009 | } |
1010 | } | |
1011 | ||
cccf0ee8 JA |
1012 | static inline void io_req_work_grab_env(struct io_kiocb *req, |
1013 | const struct io_op_def *def) | |
1014 | { | |
1015 | if (!req->work.mm && def->needs_mm) { | |
1016 | mmgrab(current->mm); | |
1017 | req->work.mm = current->mm; | |
2b188cc1 | 1018 | } |
cccf0ee8 JA |
1019 | if (!req->work.creds) |
1020 | req->work.creds = get_current_cred(); | |
ff002b30 JA |
1021 | if (!req->work.fs && def->needs_fs) { |
1022 | spin_lock(¤t->fs->lock); | |
1023 | if (!current->fs->in_exec) { | |
1024 | req->work.fs = current->fs; | |
1025 | req->work.fs->users++; | |
1026 | } else { | |
1027 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1028 | } | |
1029 | spin_unlock(¤t->fs->lock); | |
1030 | } | |
6ab23144 JA |
1031 | if (!req->work.task_pid) |
1032 | req->work.task_pid = task_pid_vnr(current); | |
2b188cc1 JA |
1033 | } |
1034 | ||
cccf0ee8 | 1035 | static inline void io_req_work_drop_env(struct io_kiocb *req) |
18d9be1a | 1036 | { |
cccf0ee8 JA |
1037 | if (req->work.mm) { |
1038 | mmdrop(req->work.mm); | |
1039 | req->work.mm = NULL; | |
1040 | } | |
1041 | if (req->work.creds) { | |
1042 | put_cred(req->work.creds); | |
1043 | req->work.creds = NULL; | |
1044 | } | |
ff002b30 JA |
1045 | if (req->work.fs) { |
1046 | struct fs_struct *fs = req->work.fs; | |
1047 | ||
1048 | spin_lock(&req->work.fs->lock); | |
1049 | if (--fs->users) | |
1050 | fs = NULL; | |
1051 | spin_unlock(&req->work.fs->lock); | |
1052 | if (fs) | |
1053 | free_fs_struct(fs); | |
1054 | } | |
561fb04a JA |
1055 | } |
1056 | ||
8766dd51 | 1057 | static inline void io_prep_async_work(struct io_kiocb *req, |
94ae5e77 | 1058 | struct io_kiocb **link) |
18d9be1a | 1059 | { |
d3656344 | 1060 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1061 | |
d3656344 JA |
1062 | if (req->flags & REQ_F_ISREG) { |
1063 | if (def->hash_reg_file) | |
8766dd51 | 1064 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1065 | } else { |
1066 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1067 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1068 | } |
cccf0ee8 JA |
1069 | |
1070 | io_req_work_grab_env(req, def); | |
54a91f3b | 1071 | |
94ae5e77 | 1072 | *link = io_prep_linked_timeout(req); |
561fb04a JA |
1073 | } |
1074 | ||
a197f664 | 1075 | static inline void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1076 | { |
a197f664 | 1077 | struct io_ring_ctx *ctx = req->ctx; |
94ae5e77 | 1078 | struct io_kiocb *link; |
94ae5e77 | 1079 | |
8766dd51 | 1080 | io_prep_async_work(req, &link); |
561fb04a | 1081 | |
8766dd51 PB |
1082 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1083 | &req->work, req->flags); | |
1084 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1085 | |
1086 | if (link) | |
1087 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1088 | } |
1089 | ||
5262f567 JA |
1090 | static void io_kill_timeout(struct io_kiocb *req) |
1091 | { | |
1092 | int ret; | |
1093 | ||
2d28390a | 1094 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1095 | if (ret != -1) { |
1096 | atomic_inc(&req->ctx->cq_timeouts); | |
842f9612 | 1097 | list_del_init(&req->list); |
f0e20b89 | 1098 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1099 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1100 | io_put_req(req); |
5262f567 JA |
1101 | } |
1102 | } | |
1103 | ||
1104 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1105 | { | |
1106 | struct io_kiocb *req, *tmp; | |
1107 | ||
1108 | spin_lock_irq(&ctx->completion_lock); | |
1109 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, list) | |
1110 | io_kill_timeout(req); | |
1111 | spin_unlock_irq(&ctx->completion_lock); | |
1112 | } | |
1113 | ||
04518945 | 1114 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1115 | { |
04518945 PB |
1116 | do { |
1117 | struct io_kiocb *req = list_first_entry(&ctx->defer_list, | |
1118 | struct io_kiocb, list); | |
de0617e4 | 1119 | |
04518945 PB |
1120 | if (req_need_defer(req)) |
1121 | break; | |
1122 | list_del_init(&req->list); | |
1123 | io_queue_async_work(req); | |
1124 | } while (!list_empty(&ctx->defer_list)); | |
1125 | } | |
1126 | ||
360428f8 | 1127 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1128 | { |
360428f8 PB |
1129 | while (!list_empty(&ctx->timeout_list)) { |
1130 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
1131 | struct io_kiocb, list); | |
de0617e4 | 1132 | |
360428f8 PB |
1133 | if (req->flags & REQ_F_TIMEOUT_NOSEQ) |
1134 | break; | |
bfe68a22 PB |
1135 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1136 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1137 | break; |
bfe68a22 | 1138 | |
360428f8 | 1139 | list_del_init(&req->list); |
5262f567 | 1140 | io_kill_timeout(req); |
360428f8 PB |
1141 | } |
1142 | } | |
5262f567 | 1143 | |
360428f8 PB |
1144 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1145 | { | |
1146 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1147 | __io_commit_cqring(ctx); |
1148 | ||
04518945 PB |
1149 | if (unlikely(!list_empty(&ctx->defer_list))) |
1150 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1151 | } |
1152 | ||
2b188cc1 JA |
1153 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1154 | { | |
75b28aff | 1155 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1156 | unsigned tail; |
1157 | ||
1158 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1159 | /* |
1160 | * writes to the cq entry need to come after reading head; the | |
1161 | * control dependency is enough as we're using WRITE_ONCE to | |
1162 | * fill the cq entry | |
1163 | */ | |
75b28aff | 1164 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1165 | return NULL; |
1166 | ||
1167 | ctx->cached_cq_tail++; | |
75b28aff | 1168 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1169 | } |
1170 | ||
f2842ab5 JA |
1171 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1172 | { | |
f0b493e6 JA |
1173 | if (!ctx->cq_ev_fd) |
1174 | return false; | |
7e55a19c SG |
1175 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1176 | return false; | |
f2842ab5 JA |
1177 | if (!ctx->eventfd_async) |
1178 | return true; | |
b41e9852 | 1179 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1180 | } |
1181 | ||
b41e9852 | 1182 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1183 | { |
1184 | if (waitqueue_active(&ctx->wait)) | |
1185 | wake_up(&ctx->wait); | |
1186 | if (waitqueue_active(&ctx->sqo_wait)) | |
1187 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1188 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1189 | eventfd_signal(ctx->cq_ev_fd, 1); |
1190 | } | |
1191 | ||
c4a2ed72 JA |
1192 | /* Returns true if there are no backlogged entries after the flush */ |
1193 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1194 | { |
1195 | struct io_rings *rings = ctx->rings; | |
1196 | struct io_uring_cqe *cqe; | |
1197 | struct io_kiocb *req; | |
1198 | unsigned long flags; | |
1199 | LIST_HEAD(list); | |
1200 | ||
1201 | if (!force) { | |
1202 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1203 | return true; |
1d7bb1d5 JA |
1204 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1205 | rings->cq_ring_entries)) | |
c4a2ed72 | 1206 | return false; |
1d7bb1d5 JA |
1207 | } |
1208 | ||
1209 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1210 | ||
1211 | /* if force is set, the ring is going away. always drop after that */ | |
1212 | if (force) | |
69b3e546 | 1213 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1214 | |
c4a2ed72 | 1215 | cqe = NULL; |
1d7bb1d5 JA |
1216 | while (!list_empty(&ctx->cq_overflow_list)) { |
1217 | cqe = io_get_cqring(ctx); | |
1218 | if (!cqe && !force) | |
1219 | break; | |
1220 | ||
1221 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
1222 | list); | |
1223 | list_move(&req->list, &list); | |
2ca10259 | 1224 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1225 | if (cqe) { |
1226 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1227 | WRITE_ONCE(cqe->res, req->result); | |
bcda7baa | 1228 | WRITE_ONCE(cqe->flags, req->cflags); |
1d7bb1d5 JA |
1229 | } else { |
1230 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1231 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1236 | if (cqe) { |
1237 | clear_bit(0, &ctx->sq_check_overflow); | |
1238 | clear_bit(0, &ctx->cq_check_overflow); | |
1239 | } | |
1d7bb1d5 JA |
1240 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1241 | io_cqring_ev_posted(ctx); | |
1242 | ||
1243 | while (!list_empty(&list)) { | |
1244 | req = list_first_entry(&list, struct io_kiocb, list); | |
1245 | list_del(&req->list); | |
ec9c02ad | 1246 | io_put_req(req); |
1d7bb1d5 | 1247 | } |
c4a2ed72 JA |
1248 | |
1249 | return cqe != NULL; | |
1d7bb1d5 JA |
1250 | } |
1251 | ||
bcda7baa | 1252 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1253 | { |
78e19bbe | 1254 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1255 | struct io_uring_cqe *cqe; |
1256 | ||
78e19bbe | 1257 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1258 | |
2b188cc1 JA |
1259 | /* |
1260 | * If we can't get a cq entry, userspace overflowed the | |
1261 | * submission (by quite a lot). Increment the overflow count in | |
1262 | * the ring. | |
1263 | */ | |
1264 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1265 | if (likely(cqe)) { |
78e19bbe | 1266 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1267 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1268 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1269 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1270 | WRITE_ONCE(ctx->rings->cq_overflow, |
1271 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1272 | } else { |
ad3eb2c8 JA |
1273 | if (list_empty(&ctx->cq_overflow_list)) { |
1274 | set_bit(0, &ctx->sq_check_overflow); | |
1275 | set_bit(0, &ctx->cq_check_overflow); | |
1276 | } | |
2ca10259 | 1277 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1278 | refcount_inc(&req->refs); |
1279 | req->result = res; | |
bcda7baa | 1280 | req->cflags = cflags; |
1d7bb1d5 | 1281 | list_add_tail(&req->list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1282 | } |
1283 | } | |
1284 | ||
bcda7baa JA |
1285 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1286 | { | |
1287 | __io_cqring_fill_event(req, res, 0); | |
1288 | } | |
1289 | ||
1290 | static void __io_cqring_add_event(struct io_kiocb *req, long res, long cflags) | |
2b188cc1 | 1291 | { |
78e19bbe | 1292 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1293 | unsigned long flags; |
1294 | ||
1295 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1296 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1297 | io_commit_cqring(ctx); |
1298 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1299 | ||
8c838788 | 1300 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1301 | } |
1302 | ||
bcda7baa JA |
1303 | static void io_cqring_add_event(struct io_kiocb *req, long res) |
1304 | { | |
1305 | __io_cqring_add_event(req, res, 0); | |
1306 | } | |
1307 | ||
0ddf92e8 JA |
1308 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1309 | { | |
1310 | return req == (struct io_kiocb *) | |
1311 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1312 | } | |
1313 | ||
1314 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1315 | { | |
1316 | struct io_kiocb *req; | |
1317 | ||
1318 | req = ctx->fallback_req; | |
dd461af6 | 1319 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1320 | return req; |
1321 | ||
1322 | return NULL; | |
1323 | } | |
1324 | ||
0553b8bd PB |
1325 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1326 | struct io_submit_state *state) | |
2b188cc1 | 1327 | { |
fd6fab2c | 1328 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1329 | struct io_kiocb *req; |
1330 | ||
2579f913 | 1331 | if (!state) { |
fd6fab2c | 1332 | req = kmem_cache_alloc(req_cachep, gfp); |
2579f913 | 1333 | if (unlikely(!req)) |
0ddf92e8 | 1334 | goto fallback; |
2579f913 JA |
1335 | } else if (!state->free_reqs) { |
1336 | size_t sz; | |
1337 | int ret; | |
1338 | ||
1339 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1340 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1341 | ||
1342 | /* | |
1343 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1344 | * retry single alloc to be on the safe side. | |
1345 | */ | |
1346 | if (unlikely(ret <= 0)) { | |
1347 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1348 | if (!state->reqs[0]) | |
0ddf92e8 | 1349 | goto fallback; |
fd6fab2c JA |
1350 | ret = 1; |
1351 | } | |
2579f913 | 1352 | state->free_reqs = ret - 1; |
6c8a3134 | 1353 | req = state->reqs[ret - 1]; |
2579f913 | 1354 | } else { |
2579f913 | 1355 | state->free_reqs--; |
6c8a3134 | 1356 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1357 | } |
1358 | ||
2579f913 | 1359 | return req; |
0ddf92e8 | 1360 | fallback: |
0553b8bd | 1361 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1362 | } |
1363 | ||
8da11c19 PB |
1364 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1365 | bool fixed) | |
1366 | { | |
1367 | if (fixed) | |
05589553 | 1368 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1369 | else |
1370 | fput(file); | |
1371 | } | |
1372 | ||
c6ca97b3 | 1373 | static void __io_req_aux_free(struct io_kiocb *req) |
2b188cc1 | 1374 | { |
929a3af9 PB |
1375 | if (req->flags & REQ_F_NEED_CLEANUP) |
1376 | io_cleanup_req(req); | |
1377 | ||
96fd84d8 | 1378 | kfree(req->io); |
8da11c19 PB |
1379 | if (req->file) |
1380 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
3537b6a7 JA |
1381 | if (req->task) |
1382 | put_task_struct(req->task); | |
cccf0ee8 JA |
1383 | |
1384 | io_req_work_drop_env(req); | |
def596e9 JA |
1385 | } |
1386 | ||
9e645e11 | 1387 | static void __io_free_req(struct io_kiocb *req) |
2b188cc1 | 1388 | { |
c6ca97b3 | 1389 | __io_req_aux_free(req); |
fcb323cc | 1390 | |
fcb323cc | 1391 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1392 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1393 | unsigned long flags; |
1394 | ||
1395 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1396 | list_del(&req->inflight_entry); | |
1397 | if (waitqueue_active(&ctx->inflight_wait)) | |
1398 | wake_up(&ctx->inflight_wait); | |
1399 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1400 | } | |
2b85edfc PB |
1401 | |
1402 | percpu_ref_put(&req->ctx->refs); | |
b1e50e54 PB |
1403 | if (likely(!io_is_fallback_req(req))) |
1404 | kmem_cache_free(req_cachep, req); | |
1405 | else | |
dd461af6 | 1406 | clear_bit_unlock(0, (unsigned long *) &req->ctx->fallback_req); |
e65ef56d JA |
1407 | } |
1408 | ||
c6ca97b3 JA |
1409 | struct req_batch { |
1410 | void *reqs[IO_IOPOLL_BATCH]; | |
1411 | int to_free; | |
1412 | int need_iter; | |
1413 | }; | |
1414 | ||
1415 | static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) | |
1416 | { | |
1417 | if (!rb->to_free) | |
1418 | return; | |
1419 | if (rb->need_iter) { | |
1420 | int i, inflight = 0; | |
1421 | unsigned long flags; | |
1422 | ||
1423 | for (i = 0; i < rb->to_free; i++) { | |
1424 | struct io_kiocb *req = rb->reqs[i]; | |
1425 | ||
c6ca97b3 JA |
1426 | if (req->flags & REQ_F_INFLIGHT) |
1427 | inflight++; | |
c6ca97b3 JA |
1428 | __io_req_aux_free(req); |
1429 | } | |
1430 | if (!inflight) | |
1431 | goto do_free; | |
1432 | ||
1433 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1434 | for (i = 0; i < rb->to_free; i++) { | |
1435 | struct io_kiocb *req = rb->reqs[i]; | |
1436 | ||
10fef4be | 1437 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 JA |
1438 | list_del(&req->inflight_entry); |
1439 | if (!--inflight) | |
1440 | break; | |
1441 | } | |
1442 | } | |
1443 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1444 | ||
1445 | if (waitqueue_active(&ctx->inflight_wait)) | |
1446 | wake_up(&ctx->inflight_wait); | |
1447 | } | |
1448 | do_free: | |
1449 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1450 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
c6ca97b3 | 1451 | rb->to_free = rb->need_iter = 0; |
e65ef56d JA |
1452 | } |
1453 | ||
a197f664 | 1454 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1455 | { |
a197f664 | 1456 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1457 | int ret; |
1458 | ||
2d28390a | 1459 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1460 | if (ret != -1) { |
78e19bbe | 1461 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1462 | io_commit_cqring(ctx); |
dea3b49c | 1463 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1464 | io_put_req(req); |
2665abfd JA |
1465 | return true; |
1466 | } | |
1467 | ||
1468 | return false; | |
e65ef56d JA |
1469 | } |
1470 | ||
ba816ad6 | 1471 | static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
9e645e11 | 1472 | { |
2665abfd | 1473 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1474 | bool wake_ev = false; |
9e645e11 | 1475 | |
4d7dd462 JA |
1476 | /* Already got next link */ |
1477 | if (req->flags & REQ_F_LINK_NEXT) | |
1478 | return; | |
1479 | ||
9e645e11 JA |
1480 | /* |
1481 | * The list should never be empty when we are called here. But could | |
1482 | * potentially happen if the chain is messed up, check to be on the | |
1483 | * safe side. | |
1484 | */ | |
4493233e PB |
1485 | while (!list_empty(&req->link_list)) { |
1486 | struct io_kiocb *nxt = list_first_entry(&req->link_list, | |
1487 | struct io_kiocb, link_list); | |
94ae5e77 | 1488 | |
4493233e PB |
1489 | if (unlikely((req->flags & REQ_F_LINK_TIMEOUT) && |
1490 | (nxt->flags & REQ_F_TIMEOUT))) { | |
1491 | list_del_init(&nxt->link_list); | |
94ae5e77 | 1492 | wake_ev |= io_link_cancel_timeout(nxt); |
94ae5e77 JA |
1493 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
1494 | continue; | |
1495 | } | |
9e645e11 | 1496 | |
4493233e PB |
1497 | list_del_init(&req->link_list); |
1498 | if (!list_empty(&nxt->link_list)) | |
dea3b49c | 1499 | nxt->flags |= REQ_F_LINK_HEAD; |
b18fdf71 | 1500 | *nxtptr = nxt; |
94ae5e77 | 1501 | break; |
9e645e11 | 1502 | } |
2665abfd | 1503 | |
4d7dd462 | 1504 | req->flags |= REQ_F_LINK_NEXT; |
2665abfd JA |
1505 | if (wake_ev) |
1506 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1507 | } |
1508 | ||
1509 | /* | |
dea3b49c | 1510 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 JA |
1511 | */ |
1512 | static void io_fail_links(struct io_kiocb *req) | |
1513 | { | |
2665abfd | 1514 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1515 | unsigned long flags; |
1516 | ||
1517 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
9e645e11 JA |
1518 | |
1519 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1520 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1521 | struct io_kiocb, link_list); | |
9e645e11 | 1522 | |
4493233e | 1523 | list_del_init(&link->link_list); |
c826bd7a | 1524 | trace_io_uring_fail_link(req, link); |
2665abfd JA |
1525 | |
1526 | if ((req->flags & REQ_F_LINK_TIMEOUT) && | |
d625c6ee | 1527 | link->opcode == IORING_OP_LINK_TIMEOUT) { |
a197f664 | 1528 | io_link_cancel_timeout(link); |
2665abfd | 1529 | } else { |
78e19bbe | 1530 | io_cqring_fill_event(link, -ECANCELED); |
978db57e | 1531 | __io_double_put_req(link); |
2665abfd | 1532 | } |
5d960724 | 1533 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1534 | } |
2665abfd JA |
1535 | |
1536 | io_commit_cqring(ctx); | |
1537 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1538 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1539 | } |
1540 | ||
4d7dd462 | 1541 | static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) |
9e645e11 | 1542 | { |
dea3b49c | 1543 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) |
2665abfd | 1544 | return; |
2665abfd | 1545 | |
9e645e11 JA |
1546 | /* |
1547 | * If LINK is set, we have dependent requests in this chain. If we | |
1548 | * didn't fail this request, queue the first one up, moving any other | |
1549 | * dependencies to the next request. In case of failure, fail the rest | |
1550 | * of the chain. | |
1551 | */ | |
2665abfd JA |
1552 | if (req->flags & REQ_F_FAIL_LINK) { |
1553 | io_fail_links(req); | |
7c9e7f0f JA |
1554 | } else if ((req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_COMP_LOCKED)) == |
1555 | REQ_F_LINK_TIMEOUT) { | |
2665abfd JA |
1556 | struct io_ring_ctx *ctx = req->ctx; |
1557 | unsigned long flags; | |
1558 | ||
1559 | /* | |
1560 | * If this is a timeout link, we could be racing with the | |
1561 | * timeout timer. Grab the completion lock for this case to | |
7c9e7f0f | 1562 | * protect against that. |
2665abfd JA |
1563 | */ |
1564 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1565 | io_req_link_next(req, nxt); | |
1566 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1567 | } else { | |
1568 | io_req_link_next(req, nxt); | |
9e645e11 | 1569 | } |
4d7dd462 | 1570 | } |
9e645e11 | 1571 | |
c69f8dbe JL |
1572 | static void io_free_req(struct io_kiocb *req) |
1573 | { | |
944e58bf PB |
1574 | struct io_kiocb *nxt = NULL; |
1575 | ||
1576 | io_req_find_next(req, &nxt); | |
70cf9f32 | 1577 | __io_free_req(req); |
944e58bf PB |
1578 | |
1579 | if (nxt) | |
1580 | io_queue_async_work(nxt); | |
c69f8dbe JL |
1581 | } |
1582 | ||
7a743e22 PB |
1583 | static void io_link_work_cb(struct io_wq_work **workptr) |
1584 | { | |
18a542ff PB |
1585 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
1586 | struct io_kiocb *link; | |
7a743e22 | 1587 | |
18a542ff | 1588 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
7a743e22 PB |
1589 | io_queue_linked_timeout(link); |
1590 | io_wq_submit_work(workptr); | |
1591 | } | |
1592 | ||
1593 | static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) | |
1594 | { | |
1595 | struct io_kiocb *link; | |
8766dd51 PB |
1596 | const struct io_op_def *def = &io_op_defs[nxt->opcode]; |
1597 | ||
1598 | if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file) | |
1599 | io_wq_hash_work(&nxt->work, file_inode(nxt->file)); | |
7a743e22 PB |
1600 | |
1601 | *workptr = &nxt->work; | |
1602 | link = io_prep_linked_timeout(nxt); | |
18a542ff | 1603 | if (link) |
7a743e22 | 1604 | nxt->work.func = io_link_work_cb; |
7a743e22 PB |
1605 | } |
1606 | ||
ba816ad6 JA |
1607 | /* |
1608 | * Drop reference to request, return next in chain (if there is one) if this | |
1609 | * was the last reference to this request. | |
1610 | */ | |
f9bd67f6 | 1611 | __attribute__((nonnull)) |
ec9c02ad | 1612 | static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
e65ef56d | 1613 | { |
2a44f467 JA |
1614 | if (refcount_dec_and_test(&req->refs)) { |
1615 | io_req_find_next(req, nxtptr); | |
4d7dd462 | 1616 | __io_free_req(req); |
2a44f467 | 1617 | } |
2b188cc1 JA |
1618 | } |
1619 | ||
e65ef56d JA |
1620 | static void io_put_req(struct io_kiocb *req) |
1621 | { | |
1622 | if (refcount_dec_and_test(&req->refs)) | |
1623 | io_free_req(req); | |
2b188cc1 JA |
1624 | } |
1625 | ||
e9fd9396 PB |
1626 | static void io_steal_work(struct io_kiocb *req, |
1627 | struct io_wq_work **workptr) | |
7a743e22 PB |
1628 | { |
1629 | /* | |
1630 | * It's in an io-wq worker, so there always should be at least | |
1631 | * one reference, which will be dropped in io_put_work() just | |
1632 | * after the current handler returns. | |
1633 | * | |
1634 | * It also means, that if the counter dropped to 1, then there is | |
1635 | * no asynchronous users left, so it's safe to steal the next work. | |
1636 | */ | |
7a743e22 PB |
1637 | if (refcount_read(&req->refs) == 1) { |
1638 | struct io_kiocb *nxt = NULL; | |
1639 | ||
1640 | io_req_find_next(req, &nxt); | |
1641 | if (nxt) | |
1642 | io_wq_assign_next(workptr, nxt); | |
1643 | } | |
1644 | } | |
1645 | ||
978db57e JA |
1646 | /* |
1647 | * Must only be used if we don't need to care about links, usually from | |
1648 | * within the completion handling itself. | |
1649 | */ | |
1650 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1651 | { |
1652 | /* drop both submit and complete references */ | |
1653 | if (refcount_sub_and_test(2, &req->refs)) | |
1654 | __io_free_req(req); | |
1655 | } | |
1656 | ||
978db57e JA |
1657 | static void io_double_put_req(struct io_kiocb *req) |
1658 | { | |
1659 | /* drop both submit and complete references */ | |
1660 | if (refcount_sub_and_test(2, &req->refs)) | |
1661 | io_free_req(req); | |
1662 | } | |
1663 | ||
1d7bb1d5 | 1664 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1665 | { |
84f97dc2 JA |
1666 | struct io_rings *rings = ctx->rings; |
1667 | ||
ad3eb2c8 JA |
1668 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1669 | /* | |
1670 | * noflush == true is from the waitqueue handler, just ensure | |
1671 | * we wake up the task, and the next invocation will flush the | |
1672 | * entries. We cannot safely to it from here. | |
1673 | */ | |
1674 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1675 | return -1U; | |
1d7bb1d5 | 1676 | |
ad3eb2c8 JA |
1677 | io_cqring_overflow_flush(ctx, false); |
1678 | } | |
1d7bb1d5 | 1679 | |
a3a0e43f JA |
1680 | /* See comment at the top of this file */ |
1681 | smp_rmb(); | |
ad3eb2c8 | 1682 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1683 | } |
1684 | ||
fb5ccc98 PB |
1685 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1686 | { | |
1687 | struct io_rings *rings = ctx->rings; | |
1688 | ||
1689 | /* make sure SQ entry isn't read before tail */ | |
1690 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1691 | } | |
1692 | ||
8237e045 | 1693 | static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) |
e94f141b | 1694 | { |
dea3b49c | 1695 | if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req)) |
c6ca97b3 | 1696 | return false; |
e94f141b | 1697 | |
9d9e88a2 | 1698 | if (req->file || req->io) |
c6ca97b3 JA |
1699 | rb->need_iter++; |
1700 | ||
1701 | rb->reqs[rb->to_free++] = req; | |
1702 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1703 | io_free_req_many(req->ctx, rb); | |
1704 | return true; | |
e94f141b JA |
1705 | } |
1706 | ||
bcda7baa JA |
1707 | static int io_put_kbuf(struct io_kiocb *req) |
1708 | { | |
4d954c25 | 1709 | struct io_buffer *kbuf; |
bcda7baa JA |
1710 | int cflags; |
1711 | ||
4d954c25 | 1712 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1713 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1714 | cflags |= IORING_CQE_F_BUFFER; | |
1715 | req->rw.addr = 0; | |
1716 | kfree(kbuf); | |
1717 | return cflags; | |
1718 | } | |
1719 | ||
def596e9 JA |
1720 | /* |
1721 | * Find and free completed poll iocbs | |
1722 | */ | |
1723 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1724 | struct list_head *done) | |
1725 | { | |
8237e045 | 1726 | struct req_batch rb; |
def596e9 | 1727 | struct io_kiocb *req; |
def596e9 | 1728 | |
c6ca97b3 | 1729 | rb.to_free = rb.need_iter = 0; |
def596e9 | 1730 | while (!list_empty(done)) { |
bcda7baa JA |
1731 | int cflags = 0; |
1732 | ||
def596e9 JA |
1733 | req = list_first_entry(done, struct io_kiocb, list); |
1734 | list_del(&req->list); | |
1735 | ||
bcda7baa JA |
1736 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1737 | cflags = io_put_kbuf(req); | |
1738 | ||
1739 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1740 | (*nr_events)++; |
1741 | ||
8237e045 JA |
1742 | if (refcount_dec_and_test(&req->refs) && |
1743 | !io_req_multi_free(&rb, req)) | |
1744 | io_free_req(req); | |
def596e9 | 1745 | } |
def596e9 | 1746 | |
09bb8394 | 1747 | io_commit_cqring(ctx); |
32b2244a XW |
1748 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1749 | io_cqring_ev_posted(ctx); | |
8237e045 | 1750 | io_free_req_many(ctx, &rb); |
def596e9 JA |
1751 | } |
1752 | ||
581f9810 BM |
1753 | static void io_iopoll_queue(struct list_head *again) |
1754 | { | |
1755 | struct io_kiocb *req; | |
1756 | ||
1757 | do { | |
1758 | req = list_first_entry(again, struct io_kiocb, list); | |
1759 | list_del(&req->list); | |
1760 | refcount_inc(&req->refs); | |
1761 | io_queue_async_work(req); | |
1762 | } while (!list_empty(again)); | |
1763 | } | |
1764 | ||
def596e9 JA |
1765 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
1766 | long min) | |
1767 | { | |
1768 | struct io_kiocb *req, *tmp; | |
1769 | LIST_HEAD(done); | |
581f9810 | 1770 | LIST_HEAD(again); |
def596e9 JA |
1771 | bool spin; |
1772 | int ret; | |
1773 | ||
1774 | /* | |
1775 | * Only spin for completions if we don't have multiple devices hanging | |
1776 | * off our complete list, and we're under the requested amount. | |
1777 | */ | |
1778 | spin = !ctx->poll_multi_file && *nr_events < min; | |
1779 | ||
1780 | ret = 0; | |
1781 | list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) { | |
9adbd45d | 1782 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
1783 | |
1784 | /* | |
581f9810 BM |
1785 | * Move completed and retryable entries to our local lists. |
1786 | * If we find a request that requires polling, break out | |
1787 | * and complete those lists first, if we have entries there. | |
def596e9 JA |
1788 | */ |
1789 | if (req->flags & REQ_F_IOPOLL_COMPLETED) { | |
1790 | list_move_tail(&req->list, &done); | |
1791 | continue; | |
1792 | } | |
1793 | if (!list_empty(&done)) | |
1794 | break; | |
1795 | ||
581f9810 BM |
1796 | if (req->result == -EAGAIN) { |
1797 | list_move_tail(&req->list, &again); | |
1798 | continue; | |
1799 | } | |
1800 | if (!list_empty(&again)) | |
1801 | break; | |
1802 | ||
def596e9 JA |
1803 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); |
1804 | if (ret < 0) | |
1805 | break; | |
1806 | ||
1807 | if (ret && spin) | |
1808 | spin = false; | |
1809 | ret = 0; | |
1810 | } | |
1811 | ||
1812 | if (!list_empty(&done)) | |
1813 | io_iopoll_complete(ctx, nr_events, &done); | |
1814 | ||
581f9810 BM |
1815 | if (!list_empty(&again)) |
1816 | io_iopoll_queue(&again); | |
1817 | ||
def596e9 JA |
1818 | return ret; |
1819 | } | |
1820 | ||
1821 | /* | |
d195a66e | 1822 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
1823 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
1824 | * as a non-spinning completion check. | |
1825 | */ | |
1826 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1827 | long min) | |
1828 | { | |
08f5439f | 1829 | while (!list_empty(&ctx->poll_list) && !need_resched()) { |
def596e9 JA |
1830 | int ret; |
1831 | ||
1832 | ret = io_do_iopoll(ctx, nr_events, min); | |
1833 | if (ret < 0) | |
1834 | return ret; | |
1835 | if (!min || *nr_events >= min) | |
1836 | return 0; | |
1837 | } | |
1838 | ||
1839 | return 1; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * We can't just wait for polled events to come to us, we have to actively | |
1844 | * find and complete them. | |
1845 | */ | |
1846 | static void io_iopoll_reap_events(struct io_ring_ctx *ctx) | |
1847 | { | |
1848 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
1849 | return; | |
1850 | ||
1851 | mutex_lock(&ctx->uring_lock); | |
1852 | while (!list_empty(&ctx->poll_list)) { | |
1853 | unsigned int nr_events = 0; | |
1854 | ||
1855 | io_iopoll_getevents(ctx, &nr_events, 1); | |
08f5439f JA |
1856 | |
1857 | /* | |
1858 | * Ensure we allow local-to-the-cpu processing to take place, | |
1859 | * in this case we need to ensure that we reap all events. | |
1860 | */ | |
1861 | cond_resched(); | |
def596e9 JA |
1862 | } |
1863 | mutex_unlock(&ctx->uring_lock); | |
1864 | } | |
1865 | ||
c7849be9 XW |
1866 | static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events, |
1867 | long min) | |
def596e9 | 1868 | { |
2b2ed975 | 1869 | int iters = 0, ret = 0; |
500f9fba | 1870 | |
c7849be9 XW |
1871 | /* |
1872 | * We disallow the app entering submit/complete with polling, but we | |
1873 | * still need to lock the ring to prevent racing with polled issue | |
1874 | * that got punted to a workqueue. | |
1875 | */ | |
1876 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
1877 | do { |
1878 | int tmin = 0; | |
1879 | ||
a3a0e43f JA |
1880 | /* |
1881 | * Don't enter poll loop if we already have events pending. | |
1882 | * If we do, we can potentially be spinning for commands that | |
1883 | * already triggered a CQE (eg in error). | |
1884 | */ | |
1d7bb1d5 | 1885 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
1886 | break; |
1887 | ||
500f9fba JA |
1888 | /* |
1889 | * If a submit got punted to a workqueue, we can have the | |
1890 | * application entering polling for a command before it gets | |
1891 | * issued. That app will hold the uring_lock for the duration | |
1892 | * of the poll right here, so we need to take a breather every | |
1893 | * now and then to ensure that the issue has a chance to add | |
1894 | * the poll to the issued list. Otherwise we can spin here | |
1895 | * forever, while the workqueue is stuck trying to acquire the | |
1896 | * very same mutex. | |
1897 | */ | |
1898 | if (!(++iters & 7)) { | |
1899 | mutex_unlock(&ctx->uring_lock); | |
1900 | mutex_lock(&ctx->uring_lock); | |
1901 | } | |
1902 | ||
def596e9 JA |
1903 | if (*nr_events < min) |
1904 | tmin = min - *nr_events; | |
1905 | ||
1906 | ret = io_iopoll_getevents(ctx, nr_events, tmin); | |
1907 | if (ret <= 0) | |
1908 | break; | |
1909 | ret = 0; | |
1910 | } while (min && !*nr_events && !need_resched()); | |
1911 | ||
500f9fba | 1912 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
1913 | return ret; |
1914 | } | |
1915 | ||
491381ce | 1916 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 1917 | { |
491381ce JA |
1918 | /* |
1919 | * Tell lockdep we inherited freeze protection from submission | |
1920 | * thread. | |
1921 | */ | |
1922 | if (req->flags & REQ_F_ISREG) { | |
1923 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 1924 | |
491381ce | 1925 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 1926 | } |
491381ce | 1927 | file_end_write(req->file); |
2b188cc1 JA |
1928 | } |
1929 | ||
4e88d6e7 JA |
1930 | static inline void req_set_fail_links(struct io_kiocb *req) |
1931 | { | |
1932 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1933 | req->flags |= REQ_F_FAIL_LINK; | |
1934 | } | |
1935 | ||
ba816ad6 | 1936 | static void io_complete_rw_common(struct kiocb *kiocb, long res) |
2b188cc1 | 1937 | { |
9adbd45d | 1938 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 1939 | int cflags = 0; |
2b188cc1 | 1940 | |
491381ce JA |
1941 | if (kiocb->ki_flags & IOCB_WRITE) |
1942 | kiocb_end_write(req); | |
2b188cc1 | 1943 | |
4e88d6e7 JA |
1944 | if (res != req->result) |
1945 | req_set_fail_links(req); | |
bcda7baa JA |
1946 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1947 | cflags = io_put_kbuf(req); | |
1948 | __io_cqring_add_event(req, res, cflags); | |
ba816ad6 JA |
1949 | } |
1950 | ||
1951 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
1952 | { | |
9adbd45d | 1953 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 JA |
1954 | |
1955 | io_complete_rw_common(kiocb, res); | |
e65ef56d | 1956 | io_put_req(req); |
2b188cc1 JA |
1957 | } |
1958 | ||
def596e9 JA |
1959 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
1960 | { | |
9adbd45d | 1961 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 1962 | |
491381ce JA |
1963 | if (kiocb->ki_flags & IOCB_WRITE) |
1964 | kiocb_end_write(req); | |
def596e9 | 1965 | |
4e88d6e7 JA |
1966 | if (res != req->result) |
1967 | req_set_fail_links(req); | |
9e645e11 | 1968 | req->result = res; |
def596e9 JA |
1969 | if (res != -EAGAIN) |
1970 | req->flags |= REQ_F_IOPOLL_COMPLETED; | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * After the iocb has been issued, it's safe to be found on the poll list. | |
1975 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
1976 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
1977 | * accessing the kiocb cookie. | |
1978 | */ | |
1979 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
1980 | { | |
1981 | struct io_ring_ctx *ctx = req->ctx; | |
1982 | ||
1983 | /* | |
1984 | * Track whether we have multiple files in our lists. This will impact | |
1985 | * how we do polling eventually, not spinning if we're on potentially | |
1986 | * different devices. | |
1987 | */ | |
1988 | if (list_empty(&ctx->poll_list)) { | |
1989 | ctx->poll_multi_file = false; | |
1990 | } else if (!ctx->poll_multi_file) { | |
1991 | struct io_kiocb *list_req; | |
1992 | ||
1993 | list_req = list_first_entry(&ctx->poll_list, struct io_kiocb, | |
1994 | list); | |
9adbd45d | 1995 | if (list_req->file != req->file) |
def596e9 JA |
1996 | ctx->poll_multi_file = true; |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * For fast devices, IO may have already completed. If it has, add | |
2001 | * it to the front so we find it first. | |
2002 | */ | |
2003 | if (req->flags & REQ_F_IOPOLL_COMPLETED) | |
2004 | list_add(&req->list, &ctx->poll_list); | |
2005 | else | |
2006 | list_add_tail(&req->list, &ctx->poll_list); | |
bdcd3eab XW |
2007 | |
2008 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2009 | wq_has_sleeper(&ctx->sqo_wait)) | |
2010 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2011 | } |
2012 | ||
9f13c35b | 2013 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2014 | { |
9f13c35b | 2015 | int diff = state->has_refs - state->used_refs; |
9a56a232 | 2016 | |
9f13c35b PB |
2017 | if (diff) |
2018 | fput_many(state->file, diff); | |
2019 | state->file = NULL; | |
2020 | } | |
2021 | ||
2022 | static inline void io_state_file_put(struct io_submit_state *state) | |
2023 | { | |
2024 | if (state->file) | |
2025 | __io_state_file_put(state); | |
9a56a232 JA |
2026 | } |
2027 | ||
2028 | /* | |
2029 | * Get as many references to a file as we have IOs left in this submission, | |
2030 | * assuming most submissions are for one file, or at least that each file | |
2031 | * has more than one submission. | |
2032 | */ | |
8da11c19 | 2033 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2034 | { |
2035 | if (!state) | |
2036 | return fget(fd); | |
2037 | ||
2038 | if (state->file) { | |
2039 | if (state->fd == fd) { | |
2040 | state->used_refs++; | |
2041 | state->ios_left--; | |
2042 | return state->file; | |
2043 | } | |
9f13c35b | 2044 | __io_state_file_put(state); |
9a56a232 JA |
2045 | } |
2046 | state->file = fget_many(fd, state->ios_left); | |
2047 | if (!state->file) | |
2048 | return NULL; | |
2049 | ||
2050 | state->fd = fd; | |
2051 | state->has_refs = state->ios_left; | |
2052 | state->used_refs = 1; | |
2053 | state->ios_left--; | |
2054 | return state->file; | |
2055 | } | |
2056 | ||
2b188cc1 JA |
2057 | /* |
2058 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2059 | * any file. For now, just ensure that anything potentially problematic is done | |
2060 | * inline. | |
2061 | */ | |
af197f50 | 2062 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2063 | { |
2064 | umode_t mode = file_inode(file)->i_mode; | |
2065 | ||
10d59345 | 2066 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISSOCK(mode)) |
2b188cc1 JA |
2067 | return true; |
2068 | if (S_ISREG(mode) && file->f_op != &io_uring_fops) | |
2069 | return true; | |
2070 | ||
af197f50 JA |
2071 | if (!(file->f_mode & FMODE_NOWAIT)) |
2072 | return false; | |
2073 | ||
2074 | if (rw == READ) | |
2075 | return file->f_op->read_iter != NULL; | |
2076 | ||
2077 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2078 | } |
2079 | ||
3529d8c2 JA |
2080 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2081 | bool force_nonblock) | |
2b188cc1 | 2082 | { |
def596e9 | 2083 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2084 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2085 | unsigned ioprio; |
2086 | int ret; | |
2b188cc1 | 2087 | |
491381ce JA |
2088 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2089 | req->flags |= REQ_F_ISREG; | |
2090 | ||
2b188cc1 | 2091 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2092 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2093 | req->flags |= REQ_F_CUR_POS; | |
2094 | kiocb->ki_pos = req->file->f_pos; | |
2095 | } | |
2b188cc1 | 2096 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2097 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2098 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2099 | if (unlikely(ret)) | |
2100 | return ret; | |
2b188cc1 JA |
2101 | |
2102 | ioprio = READ_ONCE(sqe->ioprio); | |
2103 | if (ioprio) { | |
2104 | ret = ioprio_check_cap(ioprio); | |
2105 | if (ret) | |
09bb8394 | 2106 | return ret; |
2b188cc1 JA |
2107 | |
2108 | kiocb->ki_ioprio = ioprio; | |
2109 | } else | |
2110 | kiocb->ki_ioprio = get_current_ioprio(); | |
2111 | ||
8449eeda | 2112 | /* don't allow async punt if RWF_NOWAIT was requested */ |
491381ce JA |
2113 | if ((kiocb->ki_flags & IOCB_NOWAIT) || |
2114 | (req->file->f_flags & O_NONBLOCK)) | |
8449eeda SB |
2115 | req->flags |= REQ_F_NOWAIT; |
2116 | ||
2117 | if (force_nonblock) | |
2b188cc1 | 2118 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2119 | |
def596e9 | 2120 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2121 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2122 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2123 | return -EOPNOTSUPP; |
2b188cc1 | 2124 | |
def596e9 JA |
2125 | kiocb->ki_flags |= IOCB_HIPRI; |
2126 | kiocb->ki_complete = io_complete_rw_iopoll; | |
6873e0bd | 2127 | req->result = 0; |
def596e9 | 2128 | } else { |
09bb8394 JA |
2129 | if (kiocb->ki_flags & IOCB_HIPRI) |
2130 | return -EINVAL; | |
def596e9 JA |
2131 | kiocb->ki_complete = io_complete_rw; |
2132 | } | |
9adbd45d | 2133 | |
3529d8c2 JA |
2134 | req->rw.addr = READ_ONCE(sqe->addr); |
2135 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2136 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2137 | return 0; |
2b188cc1 JA |
2138 | } |
2139 | ||
2140 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2141 | { | |
2142 | switch (ret) { | |
2143 | case -EIOCBQUEUED: | |
2144 | break; | |
2145 | case -ERESTARTSYS: | |
2146 | case -ERESTARTNOINTR: | |
2147 | case -ERESTARTNOHAND: | |
2148 | case -ERESTART_RESTARTBLOCK: | |
2149 | /* | |
2150 | * We can't just restart the syscall, since previously | |
2151 | * submitted sqes may already be in progress. Just fail this | |
2152 | * IO with EINTR. | |
2153 | */ | |
2154 | ret = -EINTR; | |
2155 | /* fall through */ | |
2156 | default: | |
2157 | kiocb->ki_complete(kiocb, ret, 0); | |
2158 | } | |
2159 | } | |
2160 | ||
014db007 | 2161 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret) |
ba816ad6 | 2162 | { |
ba04291e JA |
2163 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2164 | ||
2165 | if (req->flags & REQ_F_CUR_POS) | |
2166 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2167 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
014db007 | 2168 | io_complete_rw(kiocb, ret, 0); |
ba816ad6 JA |
2169 | else |
2170 | io_rw_done(kiocb, ret); | |
2171 | } | |
2172 | ||
9adbd45d | 2173 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2174 | struct iov_iter *iter) |
edafccee | 2175 | { |
9adbd45d JA |
2176 | struct io_ring_ctx *ctx = req->ctx; |
2177 | size_t len = req->rw.len; | |
edafccee | 2178 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2179 | u16 index, buf_index; |
edafccee JA |
2180 | size_t offset; |
2181 | u64 buf_addr; | |
2182 | ||
2183 | /* attempt to use fixed buffers without having provided iovecs */ | |
2184 | if (unlikely(!ctx->user_bufs)) | |
2185 | return -EFAULT; | |
2186 | ||
4f4eeba8 | 2187 | buf_index = req->buf_index; |
edafccee JA |
2188 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2189 | return -EFAULT; | |
2190 | ||
2191 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2192 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2193 | buf_addr = req->rw.addr; |
edafccee JA |
2194 | |
2195 | /* overflow */ | |
2196 | if (buf_addr + len < buf_addr) | |
2197 | return -EFAULT; | |
2198 | /* not inside the mapped region */ | |
2199 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2200 | return -EFAULT; | |
2201 | ||
2202 | /* | |
2203 | * May not be a start of buffer, set size appropriately | |
2204 | * and advance us to the beginning. | |
2205 | */ | |
2206 | offset = buf_addr - imu->ubuf; | |
2207 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2208 | |
2209 | if (offset) { | |
2210 | /* | |
2211 | * Don't use iov_iter_advance() here, as it's really slow for | |
2212 | * using the latter parts of a big fixed buffer - it iterates | |
2213 | * over each segment manually. We can cheat a bit here, because | |
2214 | * we know that: | |
2215 | * | |
2216 | * 1) it's a BVEC iter, we set it up | |
2217 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2218 | * first and last bvec | |
2219 | * | |
2220 | * So just find our index, and adjust the iterator afterwards. | |
2221 | * If the offset is within the first bvec (or the whole first | |
2222 | * bvec, just use iov_iter_advance(). This makes it easier | |
2223 | * since we can just skip the first segment, which may not | |
2224 | * be PAGE_SIZE aligned. | |
2225 | */ | |
2226 | const struct bio_vec *bvec = imu->bvec; | |
2227 | ||
2228 | if (offset <= bvec->bv_len) { | |
2229 | iov_iter_advance(iter, offset); | |
2230 | } else { | |
2231 | unsigned long seg_skip; | |
2232 | ||
2233 | /* skip first vec */ | |
2234 | offset -= bvec->bv_len; | |
2235 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2236 | ||
2237 | iter->bvec = bvec + seg_skip; | |
2238 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2239 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2240 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2241 | } |
2242 | } | |
2243 | ||
5e559561 | 2244 | return len; |
edafccee JA |
2245 | } |
2246 | ||
bcda7baa JA |
2247 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2248 | { | |
2249 | if (needs_lock) | |
2250 | mutex_unlock(&ctx->uring_lock); | |
2251 | } | |
2252 | ||
2253 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2254 | { | |
2255 | /* | |
2256 | * "Normal" inline submissions always hold the uring_lock, since we | |
2257 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2258 | * The only exception is when we've detached the request and issue it | |
2259 | * from an async worker thread, grab the lock for that case. | |
2260 | */ | |
2261 | if (needs_lock) | |
2262 | mutex_lock(&ctx->uring_lock); | |
2263 | } | |
2264 | ||
2265 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2266 | int bgid, struct io_buffer *kbuf, | |
2267 | bool needs_lock) | |
2268 | { | |
2269 | struct io_buffer *head; | |
2270 | ||
2271 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2272 | return kbuf; | |
2273 | ||
2274 | io_ring_submit_lock(req->ctx, needs_lock); | |
2275 | ||
2276 | lockdep_assert_held(&req->ctx->uring_lock); | |
2277 | ||
2278 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2279 | if (head) { | |
2280 | if (!list_empty(&head->list)) { | |
2281 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2282 | list); | |
2283 | list_del(&kbuf->list); | |
2284 | } else { | |
2285 | kbuf = head; | |
2286 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2287 | } | |
2288 | if (*len > kbuf->len) | |
2289 | *len = kbuf->len; | |
2290 | } else { | |
2291 | kbuf = ERR_PTR(-ENOBUFS); | |
2292 | } | |
2293 | ||
2294 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2295 | ||
2296 | return kbuf; | |
2297 | } | |
2298 | ||
4d954c25 JA |
2299 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2300 | bool needs_lock) | |
2301 | { | |
2302 | struct io_buffer *kbuf; | |
4f4eeba8 | 2303 | u16 bgid; |
4d954c25 JA |
2304 | |
2305 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2306 | bgid = req->buf_index; |
4d954c25 JA |
2307 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2308 | if (IS_ERR(kbuf)) | |
2309 | return kbuf; | |
2310 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2311 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2312 | return u64_to_user_ptr(kbuf->addr); | |
2313 | } | |
2314 | ||
2315 | #ifdef CONFIG_COMPAT | |
2316 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2317 | bool needs_lock) | |
2318 | { | |
2319 | struct compat_iovec __user *uiov; | |
2320 | compat_ssize_t clen; | |
2321 | void __user *buf; | |
2322 | ssize_t len; | |
2323 | ||
2324 | uiov = u64_to_user_ptr(req->rw.addr); | |
2325 | if (!access_ok(uiov, sizeof(*uiov))) | |
2326 | return -EFAULT; | |
2327 | if (__get_user(clen, &uiov->iov_len)) | |
2328 | return -EFAULT; | |
2329 | if (clen < 0) | |
2330 | return -EINVAL; | |
2331 | ||
2332 | len = clen; | |
2333 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2334 | if (IS_ERR(buf)) | |
2335 | return PTR_ERR(buf); | |
2336 | iov[0].iov_base = buf; | |
2337 | iov[0].iov_len = (compat_size_t) len; | |
2338 | return 0; | |
2339 | } | |
2340 | #endif | |
2341 | ||
2342 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2343 | bool needs_lock) | |
2344 | { | |
2345 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2346 | void __user *buf; | |
2347 | ssize_t len; | |
2348 | ||
2349 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2350 | return -EFAULT; | |
2351 | ||
2352 | len = iov[0].iov_len; | |
2353 | if (len < 0) | |
2354 | return -EINVAL; | |
2355 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2356 | if (IS_ERR(buf)) | |
2357 | return PTR_ERR(buf); | |
2358 | iov[0].iov_base = buf; | |
2359 | iov[0].iov_len = len; | |
2360 | return 0; | |
2361 | } | |
2362 | ||
2363 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2364 | bool needs_lock) | |
2365 | { | |
dddb3e26 JA |
2366 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2367 | struct io_buffer *kbuf; | |
2368 | ||
2369 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2370 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2371 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2372 | return 0; |
dddb3e26 | 2373 | } |
4d954c25 JA |
2374 | if (!req->rw.len) |
2375 | return 0; | |
2376 | else if (req->rw.len > 1) | |
2377 | return -EINVAL; | |
2378 | ||
2379 | #ifdef CONFIG_COMPAT | |
2380 | if (req->ctx->compat) | |
2381 | return io_compat_import(req, iov, needs_lock); | |
2382 | #endif | |
2383 | ||
2384 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2385 | } | |
2386 | ||
cf6fd4bd | 2387 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2388 | struct iovec **iovec, struct iov_iter *iter, |
2389 | bool needs_lock) | |
2b188cc1 | 2390 | { |
9adbd45d JA |
2391 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2392 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2393 | ssize_t ret; |
edafccee JA |
2394 | u8 opcode; |
2395 | ||
d625c6ee | 2396 | opcode = req->opcode; |
7d009165 | 2397 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2398 | *iovec = NULL; |
9adbd45d | 2399 | return io_import_fixed(req, rw, iter); |
edafccee | 2400 | } |
2b188cc1 | 2401 | |
bcda7baa | 2402 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2403 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2404 | return -EINVAL; |
2405 | ||
3a6820f2 | 2406 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2407 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2408 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2409 | if (IS_ERR(buf)) { | |
bcda7baa | 2410 | *iovec = NULL; |
4d954c25 | 2411 | return PTR_ERR(buf); |
bcda7baa | 2412 | } |
3f9d6441 | 2413 | req->rw.len = sqe_len; |
bcda7baa JA |
2414 | } |
2415 | ||
3a6820f2 JA |
2416 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2417 | *iovec = NULL; | |
3a901598 | 2418 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2419 | } |
2420 | ||
f67676d1 JA |
2421 | if (req->io) { |
2422 | struct io_async_rw *iorw = &req->io->rw; | |
2423 | ||
2424 | *iovec = iorw->iov; | |
2425 | iov_iter_init(iter, rw, *iovec, iorw->nr_segs, iorw->size); | |
2426 | if (iorw->iov == iorw->fast_iov) | |
2427 | *iovec = NULL; | |
2428 | return iorw->size; | |
2429 | } | |
2430 | ||
4d954c25 JA |
2431 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2432 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2433 | if (!ret) { |
2434 | ret = (*iovec)->iov_len; | |
2435 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2436 | } | |
4d954c25 JA |
2437 | *iovec = NULL; |
2438 | return ret; | |
2439 | } | |
2440 | ||
2b188cc1 | 2441 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2442 | if (req->ctx->compat) |
2b188cc1 JA |
2443 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2444 | iovec, iter); | |
2445 | #endif | |
2446 | ||
2447 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2448 | } | |
2449 | ||
31b51510 | 2450 | /* |
32960613 JA |
2451 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2452 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2453 | */ |
32960613 JA |
2454 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2455 | struct iov_iter *iter) | |
2456 | { | |
2457 | ssize_t ret = 0; | |
2458 | ||
2459 | /* | |
2460 | * Don't support polled IO through this interface, and we can't | |
2461 | * support non-blocking either. For the latter, this just causes | |
2462 | * the kiocb to be handled from an async context. | |
2463 | */ | |
2464 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2465 | return -EOPNOTSUPP; | |
2466 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2467 | return -EAGAIN; | |
2468 | ||
2469 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2470 | struct iovec iovec; |
32960613 JA |
2471 | ssize_t nr; |
2472 | ||
311ae9e1 PB |
2473 | if (!iov_iter_is_bvec(iter)) { |
2474 | iovec = iov_iter_iovec(iter); | |
2475 | } else { | |
2476 | /* fixed buffers import bvec */ | |
2477 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2478 | + iter->iov_offset; | |
2479 | iovec.iov_len = min(iter->count, | |
2480 | iter->bvec->bv_len - iter->iov_offset); | |
2481 | } | |
2482 | ||
32960613 JA |
2483 | if (rw == READ) { |
2484 | nr = file->f_op->read(file, iovec.iov_base, | |
2485 | iovec.iov_len, &kiocb->ki_pos); | |
2486 | } else { | |
2487 | nr = file->f_op->write(file, iovec.iov_base, | |
2488 | iovec.iov_len, &kiocb->ki_pos); | |
2489 | } | |
2490 | ||
311ae9e1 PB |
2491 | if (iov_iter_is_bvec(iter)) |
2492 | kunmap(iter->bvec->bv_page); | |
2493 | ||
32960613 JA |
2494 | if (nr < 0) { |
2495 | if (!ret) | |
2496 | ret = nr; | |
2497 | break; | |
2498 | } | |
2499 | ret += nr; | |
2500 | if (nr != iovec.iov_len) | |
2501 | break; | |
2502 | iov_iter_advance(iter, nr); | |
2503 | } | |
2504 | ||
2505 | return ret; | |
2506 | } | |
2507 | ||
b7bb4f7d | 2508 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2509 | struct iovec *iovec, struct iovec *fast_iov, |
2510 | struct iov_iter *iter) | |
2511 | { | |
2512 | req->io->rw.nr_segs = iter->nr_segs; | |
2513 | req->io->rw.size = io_size; | |
2514 | req->io->rw.iov = iovec; | |
2515 | if (!req->io->rw.iov) { | |
2516 | req->io->rw.iov = req->io->rw.fast_iov; | |
45097dae XW |
2517 | if (req->io->rw.iov != fast_iov) |
2518 | memcpy(req->io->rw.iov, fast_iov, | |
2519 | sizeof(struct iovec) * iter->nr_segs); | |
99bc4c38 PB |
2520 | } else { |
2521 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
2522 | } |
2523 | } | |
2524 | ||
3d9932a8 XW |
2525 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2526 | { | |
2527 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2528 | return req->io == NULL; | |
2529 | } | |
2530 | ||
b7bb4f7d | 2531 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2532 | { |
d3656344 JA |
2533 | if (!io_op_defs[req->opcode].async_ctx) |
2534 | return 0; | |
3d9932a8 XW |
2535 | |
2536 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2537 | } |
2538 | ||
b7bb4f7d JA |
2539 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2540 | struct iovec *iovec, struct iovec *fast_iov, | |
2541 | struct iov_iter *iter) | |
2542 | { | |
980ad263 | 2543 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2544 | return 0; |
5d204bcf | 2545 | if (!req->io) { |
3d9932a8 | 2546 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2547 | return -ENOMEM; |
b7bb4f7d | 2548 | |
5d204bcf JA |
2549 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2550 | } | |
b7bb4f7d | 2551 | return 0; |
f67676d1 JA |
2552 | } |
2553 | ||
3529d8c2 JA |
2554 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2555 | bool force_nonblock) | |
f67676d1 | 2556 | { |
3529d8c2 JA |
2557 | struct io_async_ctx *io; |
2558 | struct iov_iter iter; | |
f67676d1 JA |
2559 | ssize_t ret; |
2560 | ||
3529d8c2 JA |
2561 | ret = io_prep_rw(req, sqe, force_nonblock); |
2562 | if (ret) | |
2563 | return ret; | |
f67676d1 | 2564 | |
3529d8c2 JA |
2565 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2566 | return -EBADF; | |
f67676d1 | 2567 | |
5f798bea PB |
2568 | /* either don't need iovec imported or already have it */ |
2569 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2570 | return 0; |
2571 | ||
2572 | io = req->io; | |
2573 | io->rw.iov = io->rw.fast_iov; | |
2574 | req->io = NULL; | |
bcda7baa | 2575 | ret = io_import_iovec(READ, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2576 | req->io = io; |
2577 | if (ret < 0) | |
2578 | return ret; | |
2579 | ||
2580 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2581 | return 0; | |
f67676d1 JA |
2582 | } |
2583 | ||
014db007 | 2584 | static int io_read(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2585 | { |
2586 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2587 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2588 | struct iov_iter iter; |
31b51510 | 2589 | size_t iov_count; |
f67676d1 | 2590 | ssize_t io_size, ret; |
2b188cc1 | 2591 | |
bcda7baa | 2592 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2593 | if (ret < 0) |
2594 | return ret; | |
2b188cc1 | 2595 | |
fd6c2e4c JA |
2596 | /* Ensure we clear previously set non-block flag */ |
2597 | if (!force_nonblock) | |
29de5f6a | 2598 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2599 | |
797f3f53 | 2600 | req->result = 0; |
f67676d1 | 2601 | io_size = ret; |
dea3b49c | 2602 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 JA |
2603 | req->result = io_size; |
2604 | ||
2605 | /* | |
2606 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2607 | * we know to async punt it even if it was opened O_NONBLOCK | |
2608 | */ | |
af197f50 | 2609 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 2610 | goto copy_iov; |
9e645e11 | 2611 | |
31b51510 | 2612 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2613 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 JA |
2614 | if (!ret) { |
2615 | ssize_t ret2; | |
2616 | ||
9adbd45d JA |
2617 | if (req->file->f_op->read_iter) |
2618 | ret2 = call_read_iter(req->file, kiocb, &iter); | |
32960613 | 2619 | else |
9adbd45d | 2620 | ret2 = loop_rw_iter(READ, req->file, kiocb, &iter); |
32960613 | 2621 | |
9d93a3f5 | 2622 | /* Catch -EAGAIN return for forced non-blocking submission */ |
f67676d1 | 2623 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2624 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2625 | } else { |
2626 | copy_iov: | |
b7bb4f7d | 2627 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2628 | inline_vecs, &iter); |
2629 | if (ret) | |
2630 | goto out_free; | |
29de5f6a | 2631 | /* any defer here is final, must blocking retry */ |
490e8967 JA |
2632 | if (!(req->flags & REQ_F_NOWAIT) && |
2633 | !file_can_poll(req->file)) | |
29de5f6a | 2634 | req->flags |= REQ_F_MUST_PUNT; |
f67676d1 JA |
2635 | return -EAGAIN; |
2636 | } | |
2b188cc1 | 2637 | } |
f67676d1 | 2638 | out_free: |
1e95081c | 2639 | kfree(iovec); |
99bc4c38 | 2640 | req->flags &= ~REQ_F_NEED_CLEANUP; |
2b188cc1 JA |
2641 | return ret; |
2642 | } | |
2643 | ||
3529d8c2 JA |
2644 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2645 | bool force_nonblock) | |
f67676d1 | 2646 | { |
3529d8c2 JA |
2647 | struct io_async_ctx *io; |
2648 | struct iov_iter iter; | |
f67676d1 JA |
2649 | ssize_t ret; |
2650 | ||
3529d8c2 JA |
2651 | ret = io_prep_rw(req, sqe, force_nonblock); |
2652 | if (ret) | |
2653 | return ret; | |
f67676d1 | 2654 | |
3529d8c2 JA |
2655 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
2656 | return -EBADF; | |
f67676d1 | 2657 | |
4ed734b0 JA |
2658 | req->fsize = rlimit(RLIMIT_FSIZE); |
2659 | ||
5f798bea PB |
2660 | /* either don't need iovec imported or already have it */ |
2661 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2662 | return 0; |
2663 | ||
2664 | io = req->io; | |
2665 | io->rw.iov = io->rw.fast_iov; | |
2666 | req->io = NULL; | |
bcda7baa | 2667 | ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2668 | req->io = io; |
2669 | if (ret < 0) | |
2670 | return ret; | |
2671 | ||
2672 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2673 | return 0; | |
f67676d1 JA |
2674 | } |
2675 | ||
014db007 | 2676 | static int io_write(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2677 | { |
2678 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2679 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2680 | struct iov_iter iter; |
31b51510 | 2681 | size_t iov_count; |
f67676d1 | 2682 | ssize_t ret, io_size; |
2b188cc1 | 2683 | |
bcda7baa | 2684 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2685 | if (ret < 0) |
2686 | return ret; | |
2b188cc1 | 2687 | |
fd6c2e4c JA |
2688 | /* Ensure we clear previously set non-block flag */ |
2689 | if (!force_nonblock) | |
9adbd45d | 2690 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2691 | |
797f3f53 | 2692 | req->result = 0; |
f67676d1 | 2693 | io_size = ret; |
dea3b49c | 2694 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 | 2695 | req->result = io_size; |
9e645e11 | 2696 | |
f67676d1 JA |
2697 | /* |
2698 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2699 | * we know to async punt it even if it was opened O_NONBLOCK | |
2700 | */ | |
af197f50 | 2701 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 2702 | goto copy_iov; |
31b51510 | 2703 | |
10d59345 JA |
2704 | /* file path doesn't support NOWAIT for non-direct_IO */ |
2705 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
2706 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 2707 | goto copy_iov; |
31b51510 | 2708 | |
f67676d1 | 2709 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2710 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 2711 | if (!ret) { |
9bf7933f RP |
2712 | ssize_t ret2; |
2713 | ||
2b188cc1 JA |
2714 | /* |
2715 | * Open-code file_start_write here to grab freeze protection, | |
2716 | * which will be released by another thread in | |
2717 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
2718 | * released so that it doesn't complain about the held lock when | |
2719 | * we return to userspace. | |
2720 | */ | |
491381ce | 2721 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 2722 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 2723 | SB_FREEZE_WRITE, true); |
9adbd45d | 2724 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
2725 | SB_FREEZE_WRITE); |
2726 | } | |
2727 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 2728 | |
4ed734b0 JA |
2729 | if (!force_nonblock) |
2730 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; | |
2731 | ||
9adbd45d JA |
2732 | if (req->file->f_op->write_iter) |
2733 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 2734 | else |
9adbd45d | 2735 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 JA |
2736 | |
2737 | if (!force_nonblock) | |
2738 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
2739 | ||
faac996c | 2740 | /* |
bff6035d | 2741 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
2742 | * retry them without IOCB_NOWAIT. |
2743 | */ | |
2744 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
2745 | ret2 = -EAGAIN; | |
f67676d1 | 2746 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2747 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2748 | } else { |
2749 | copy_iov: | |
b7bb4f7d | 2750 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2751 | inline_vecs, &iter); |
2752 | if (ret) | |
2753 | goto out_free; | |
29de5f6a | 2754 | /* any defer here is final, must blocking retry */ |
490e8967 JA |
2755 | if (!file_can_poll(req->file)) |
2756 | req->flags |= REQ_F_MUST_PUNT; | |
f67676d1 JA |
2757 | return -EAGAIN; |
2758 | } | |
2b188cc1 | 2759 | } |
31b51510 | 2760 | out_free: |
99bc4c38 | 2761 | req->flags &= ~REQ_F_NEED_CLEANUP; |
1e95081c | 2762 | kfree(iovec); |
2b188cc1 JA |
2763 | return ret; |
2764 | } | |
2765 | ||
f2a8d5c7 PB |
2766 | static int __io_splice_prep(struct io_kiocb *req, |
2767 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
2768 | { |
2769 | struct io_splice* sp = &req->splice; | |
2770 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
2771 | int ret; | |
2772 | ||
2773 | if (req->flags & REQ_F_NEED_CLEANUP) | |
2774 | return 0; | |
3232dd02 PB |
2775 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
2776 | return -EINVAL; | |
7d67af2c PB |
2777 | |
2778 | sp->file_in = NULL; | |
7d67af2c PB |
2779 | sp->len = READ_ONCE(sqe->len); |
2780 | sp->flags = READ_ONCE(sqe->splice_flags); | |
2781 | ||
2782 | if (unlikely(sp->flags & ~valid_flags)) | |
2783 | return -EINVAL; | |
2784 | ||
2785 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
2786 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2787 | if (ret) | |
2788 | return ret; | |
2789 | req->flags |= REQ_F_NEED_CLEANUP; | |
2790 | ||
2791 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) | |
2792 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
2793 | ||
2794 | return 0; | |
2795 | } | |
2796 | ||
f2a8d5c7 PB |
2797 | static int io_tee_prep(struct io_kiocb *req, |
2798 | const struct io_uring_sqe *sqe) | |
2799 | { | |
2800 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
2801 | return -EINVAL; | |
2802 | return __io_splice_prep(req, sqe); | |
2803 | } | |
2804 | ||
2805 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
2806 | { | |
2807 | struct io_splice *sp = &req->splice; | |
2808 | struct file *in = sp->file_in; | |
2809 | struct file *out = sp->file_out; | |
2810 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2811 | long ret = 0; | |
2812 | ||
2813 | if (force_nonblock) | |
2814 | return -EAGAIN; | |
2815 | if (sp->len) | |
2816 | ret = do_tee(in, out, sp->len, flags); | |
2817 | ||
2818 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2819 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2820 | ||
2821 | io_cqring_add_event(req, ret); | |
2822 | if (ret != sp->len) | |
2823 | req_set_fail_links(req); | |
2824 | io_put_req(req); | |
2825 | return 0; | |
2826 | } | |
2827 | ||
2828 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
2829 | { | |
2830 | struct io_splice* sp = &req->splice; | |
2831 | ||
2832 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
2833 | sp->off_out = READ_ONCE(sqe->off); | |
2834 | return __io_splice_prep(req, sqe); | |
2835 | } | |
2836 | ||
014db007 | 2837 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
2838 | { |
2839 | struct io_splice *sp = &req->splice; | |
2840 | struct file *in = sp->file_in; | |
2841 | struct file *out = sp->file_out; | |
2842 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2843 | loff_t *poff_in, *poff_out; | |
c9687426 | 2844 | long ret = 0; |
7d67af2c | 2845 | |
2fb3e822 PB |
2846 | if (force_nonblock) |
2847 | return -EAGAIN; | |
7d67af2c PB |
2848 | |
2849 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
2850 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 2851 | |
948a7749 | 2852 | if (sp->len) |
c9687426 | 2853 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
2854 | |
2855 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2856 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2857 | ||
2858 | io_cqring_add_event(req, ret); | |
2859 | if (ret != sp->len) | |
2860 | req_set_fail_links(req); | |
014db007 | 2861 | io_put_req(req); |
7d67af2c PB |
2862 | return 0; |
2863 | } | |
2864 | ||
2b188cc1 JA |
2865 | /* |
2866 | * IORING_OP_NOP just posts a completion event, nothing else. | |
2867 | */ | |
78e19bbe | 2868 | static int io_nop(struct io_kiocb *req) |
2b188cc1 JA |
2869 | { |
2870 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 2871 | |
def596e9 JA |
2872 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
2873 | return -EINVAL; | |
2874 | ||
78e19bbe | 2875 | io_cqring_add_event(req, 0); |
e65ef56d | 2876 | io_put_req(req); |
2b188cc1 JA |
2877 | return 0; |
2878 | } | |
2879 | ||
3529d8c2 | 2880 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 2881 | { |
6b06314c | 2882 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 2883 | |
09bb8394 JA |
2884 | if (!req->file) |
2885 | return -EBADF; | |
c992fe29 | 2886 | |
6b06314c | 2887 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 2888 | return -EINVAL; |
edafccee | 2889 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
2890 | return -EINVAL; |
2891 | ||
8ed8d3c3 JA |
2892 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
2893 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
2894 | return -EINVAL; | |
2895 | ||
2896 | req->sync.off = READ_ONCE(sqe->off); | |
2897 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
2898 | return 0; |
2899 | } | |
2900 | ||
8ed8d3c3 JA |
2901 | static bool io_req_cancelled(struct io_kiocb *req) |
2902 | { | |
2903 | if (req->work.flags & IO_WQ_WORK_CANCEL) { | |
2904 | req_set_fail_links(req); | |
2905 | io_cqring_add_event(req, -ECANCELED); | |
2906 | io_put_req(req); | |
2907 | return true; | |
2908 | } | |
2909 | ||
2910 | return false; | |
2911 | } | |
2912 | ||
014db007 | 2913 | static void __io_fsync(struct io_kiocb *req) |
8ed8d3c3 | 2914 | { |
8ed8d3c3 | 2915 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
2916 | int ret; |
2917 | ||
9adbd45d | 2918 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
2919 | end > 0 ? end : LLONG_MAX, |
2920 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
2921 | if (ret < 0) | |
2922 | req_set_fail_links(req); | |
2923 | io_cqring_add_event(req, ret); | |
014db007 | 2924 | io_put_req(req); |
8ed8d3c3 JA |
2925 | } |
2926 | ||
5ea62161 | 2927 | static void io_fsync_finish(struct io_wq_work **workptr) |
c992fe29 | 2928 | { |
5ea62161 | 2929 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
5ea62161 PB |
2930 | |
2931 | if (io_req_cancelled(req)) | |
2932 | return; | |
014db007 | 2933 | __io_fsync(req); |
e9fd9396 | 2934 | io_steal_work(req, workptr); |
8ed8d3c3 | 2935 | } |
c992fe29 | 2936 | |
014db007 | 2937 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
c992fe29 | 2938 | { |
c992fe29 | 2939 | /* fsync always requires a blocking context */ |
8ed8d3c3 | 2940 | if (force_nonblock) { |
8ed8d3c3 | 2941 | req->work.func = io_fsync_finish; |
c992fe29 | 2942 | return -EAGAIN; |
8ed8d3c3 | 2943 | } |
014db007 | 2944 | __io_fsync(req); |
c992fe29 CH |
2945 | return 0; |
2946 | } | |
2947 | ||
014db007 | 2948 | static void __io_fallocate(struct io_kiocb *req) |
8ed8d3c3 | 2949 | { |
8ed8d3c3 JA |
2950 | int ret; |
2951 | ||
4ed734b0 | 2952 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; |
d63d1b5e JA |
2953 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
2954 | req->sync.len); | |
4ed734b0 | 2955 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
8ed8d3c3 JA |
2956 | if (ret < 0) |
2957 | req_set_fail_links(req); | |
2958 | io_cqring_add_event(req, ret); | |
014db007 | 2959 | io_put_req(req); |
5ea62161 PB |
2960 | } |
2961 | ||
2962 | static void io_fallocate_finish(struct io_wq_work **workptr) | |
2963 | { | |
2964 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
5ea62161 | 2965 | |
594506fe PB |
2966 | if (io_req_cancelled(req)) |
2967 | return; | |
014db007 | 2968 | __io_fallocate(req); |
e9fd9396 | 2969 | io_steal_work(req, workptr); |
5d17b4a4 JA |
2970 | } |
2971 | ||
d63d1b5e JA |
2972 | static int io_fallocate_prep(struct io_kiocb *req, |
2973 | const struct io_uring_sqe *sqe) | |
2974 | { | |
2975 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
2976 | return -EINVAL; | |
3232dd02 PB |
2977 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
2978 | return -EINVAL; | |
d63d1b5e JA |
2979 | |
2980 | req->sync.off = READ_ONCE(sqe->off); | |
2981 | req->sync.len = READ_ONCE(sqe->addr); | |
2982 | req->sync.mode = READ_ONCE(sqe->len); | |
4ed734b0 | 2983 | req->fsize = rlimit(RLIMIT_FSIZE); |
d63d1b5e JA |
2984 | return 0; |
2985 | } | |
2986 | ||
014db007 | 2987 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 2988 | { |
d63d1b5e | 2989 | /* fallocate always requiring blocking context */ |
8ed8d3c3 | 2990 | if (force_nonblock) { |
d63d1b5e | 2991 | req->work.func = io_fallocate_finish; |
5d17b4a4 | 2992 | return -EAGAIN; |
8ed8d3c3 | 2993 | } |
5d17b4a4 | 2994 | |
014db007 | 2995 | __io_fallocate(req); |
5d17b4a4 JA |
2996 | return 0; |
2997 | } | |
2998 | ||
ec65fea5 | 2999 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3000 | { |
f8748881 | 3001 | const char __user *fname; |
15b71abe | 3002 | int ret; |
b7bb4f7d | 3003 | |
3232dd02 PB |
3004 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3005 | return -EINVAL; | |
ec65fea5 | 3006 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3007 | return -EINVAL; |
ec65fea5 | 3008 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3009 | return -EBADF; |
03b1230c | 3010 | |
ec65fea5 PB |
3011 | /* open.how should be already initialised */ |
3012 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
3013 | req->open.how.flags |= O_LARGEFILE; | |
3529d8c2 | 3014 | |
25e72d10 PB |
3015 | req->open.dfd = READ_ONCE(sqe->fd); |
3016 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3017 | req->open.filename = getname(fname); |
15b71abe JA |
3018 | if (IS_ERR(req->open.filename)) { |
3019 | ret = PTR_ERR(req->open.filename); | |
3020 | req->open.filename = NULL; | |
3021 | return ret; | |
3022 | } | |
4022e7af | 3023 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3024 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3025 | return 0; |
03b1230c JA |
3026 | } |
3027 | ||
ec65fea5 PB |
3028 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3029 | { | |
3030 | u64 flags, mode; | |
3031 | ||
3032 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3033 | return 0; | |
3034 | mode = READ_ONCE(sqe->len); | |
3035 | flags = READ_ONCE(sqe->open_flags); | |
3036 | req->open.how = build_open_how(flags, mode); | |
3037 | return __io_openat_prep(req, sqe); | |
3038 | } | |
3039 | ||
cebdb986 | 3040 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3041 | { |
cebdb986 | 3042 | struct open_how __user *how; |
cebdb986 | 3043 | size_t len; |
0fa03c62 JA |
3044 | int ret; |
3045 | ||
0bdbdd08 PB |
3046 | if (req->flags & REQ_F_NEED_CLEANUP) |
3047 | return 0; | |
cebdb986 JA |
3048 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3049 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3050 | if (len < OPEN_HOW_SIZE_VER0) |
3051 | return -EINVAL; | |
3529d8c2 | 3052 | |
cebdb986 JA |
3053 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3054 | len); | |
3055 | if (ret) | |
3056 | return ret; | |
3529d8c2 | 3057 | |
ec65fea5 | 3058 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3059 | } |
3060 | ||
014db007 | 3061 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3062 | { |
3063 | struct open_flags op; | |
15b71abe JA |
3064 | struct file *file; |
3065 | int ret; | |
3066 | ||
f86cd20c | 3067 | if (force_nonblock) |
15b71abe | 3068 | return -EAGAIN; |
15b71abe | 3069 | |
cebdb986 | 3070 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3071 | if (ret) |
3072 | goto err; | |
3073 | ||
4022e7af | 3074 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3075 | if (ret < 0) |
3076 | goto err; | |
3077 | ||
3078 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3079 | if (IS_ERR(file)) { | |
3080 | put_unused_fd(ret); | |
3081 | ret = PTR_ERR(file); | |
3082 | } else { | |
3083 | fsnotify_open(file); | |
3084 | fd_install(ret, file); | |
3085 | } | |
3086 | err: | |
3087 | putname(req->open.filename); | |
8fef80bf | 3088 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3089 | if (ret < 0) |
3090 | req_set_fail_links(req); | |
3091 | io_cqring_add_event(req, ret); | |
014db007 | 3092 | io_put_req(req); |
15b71abe JA |
3093 | return 0; |
3094 | } | |
3095 | ||
014db007 | 3096 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3097 | { |
014db007 | 3098 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3099 | } |
3100 | ||
067524e9 JA |
3101 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3102 | const struct io_uring_sqe *sqe) | |
3103 | { | |
3104 | struct io_provide_buf *p = &req->pbuf; | |
3105 | u64 tmp; | |
3106 | ||
3107 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3108 | return -EINVAL; | |
3109 | ||
3110 | tmp = READ_ONCE(sqe->fd); | |
3111 | if (!tmp || tmp > USHRT_MAX) | |
3112 | return -EINVAL; | |
3113 | ||
3114 | memset(p, 0, sizeof(*p)); | |
3115 | p->nbufs = tmp; | |
3116 | p->bgid = READ_ONCE(sqe->buf_group); | |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3121 | int bgid, unsigned nbufs) | |
3122 | { | |
3123 | unsigned i = 0; | |
3124 | ||
3125 | /* shouldn't happen */ | |
3126 | if (!nbufs) | |
3127 | return 0; | |
3128 | ||
3129 | /* the head kbuf is the list itself */ | |
3130 | while (!list_empty(&buf->list)) { | |
3131 | struct io_buffer *nxt; | |
3132 | ||
3133 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3134 | list_del(&nxt->list); | |
3135 | kfree(nxt); | |
3136 | if (++i == nbufs) | |
3137 | return i; | |
3138 | } | |
3139 | i++; | |
3140 | kfree(buf); | |
3141 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3142 | ||
3143 | return i; | |
3144 | } | |
3145 | ||
3146 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock) | |
3147 | { | |
3148 | struct io_provide_buf *p = &req->pbuf; | |
3149 | struct io_ring_ctx *ctx = req->ctx; | |
3150 | struct io_buffer *head; | |
3151 | int ret = 0; | |
3152 | ||
3153 | io_ring_submit_lock(ctx, !force_nonblock); | |
3154 | ||
3155 | lockdep_assert_held(&ctx->uring_lock); | |
3156 | ||
3157 | ret = -ENOENT; | |
3158 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3159 | if (head) | |
3160 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3161 | ||
3162 | io_ring_submit_lock(ctx, !force_nonblock); | |
3163 | if (ret < 0) | |
3164 | req_set_fail_links(req); | |
3165 | io_cqring_add_event(req, ret); | |
3166 | io_put_req(req); | |
3167 | return 0; | |
3168 | } | |
3169 | ||
ddf0322d JA |
3170 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3171 | const struct io_uring_sqe *sqe) | |
3172 | { | |
3173 | struct io_provide_buf *p = &req->pbuf; | |
3174 | u64 tmp; | |
3175 | ||
3176 | if (sqe->ioprio || sqe->rw_flags) | |
3177 | return -EINVAL; | |
3178 | ||
3179 | tmp = READ_ONCE(sqe->fd); | |
3180 | if (!tmp || tmp > USHRT_MAX) | |
3181 | return -E2BIG; | |
3182 | p->nbufs = tmp; | |
3183 | p->addr = READ_ONCE(sqe->addr); | |
3184 | p->len = READ_ONCE(sqe->len); | |
3185 | ||
3186 | if (!access_ok(u64_to_user_ptr(p->addr), p->len)) | |
3187 | return -EFAULT; | |
3188 | ||
3189 | p->bgid = READ_ONCE(sqe->buf_group); | |
3190 | tmp = READ_ONCE(sqe->off); | |
3191 | if (tmp > USHRT_MAX) | |
3192 | return -E2BIG; | |
3193 | p->bid = tmp; | |
3194 | return 0; | |
3195 | } | |
3196 | ||
3197 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3198 | { | |
3199 | struct io_buffer *buf; | |
3200 | u64 addr = pbuf->addr; | |
3201 | int i, bid = pbuf->bid; | |
3202 | ||
3203 | for (i = 0; i < pbuf->nbufs; i++) { | |
3204 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3205 | if (!buf) | |
3206 | break; | |
3207 | ||
3208 | buf->addr = addr; | |
3209 | buf->len = pbuf->len; | |
3210 | buf->bid = bid; | |
3211 | addr += pbuf->len; | |
3212 | bid++; | |
3213 | if (!*head) { | |
3214 | INIT_LIST_HEAD(&buf->list); | |
3215 | *head = buf; | |
3216 | } else { | |
3217 | list_add_tail(&buf->list, &(*head)->list); | |
3218 | } | |
3219 | } | |
3220 | ||
3221 | return i ? i : -ENOMEM; | |
3222 | } | |
3223 | ||
ddf0322d JA |
3224 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock) |
3225 | { | |
3226 | struct io_provide_buf *p = &req->pbuf; | |
3227 | struct io_ring_ctx *ctx = req->ctx; | |
3228 | struct io_buffer *head, *list; | |
3229 | int ret = 0; | |
3230 | ||
3231 | io_ring_submit_lock(ctx, !force_nonblock); | |
3232 | ||
3233 | lockdep_assert_held(&ctx->uring_lock); | |
3234 | ||
3235 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3236 | ||
3237 | ret = io_add_buffers(p, &head); | |
3238 | if (ret < 0) | |
3239 | goto out; | |
3240 | ||
3241 | if (!list) { | |
3242 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3243 | GFP_KERNEL); | |
3244 | if (ret < 0) { | |
067524e9 | 3245 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3246 | goto out; |
3247 | } | |
3248 | } | |
3249 | out: | |
3250 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3251 | if (ret < 0) | |
3252 | req_set_fail_links(req); | |
3253 | io_cqring_add_event(req, ret); | |
3254 | io_put_req(req); | |
3255 | return 0; | |
cebdb986 JA |
3256 | } |
3257 | ||
3e4827b0 JA |
3258 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3259 | const struct io_uring_sqe *sqe) | |
3260 | { | |
3261 | #if defined(CONFIG_EPOLL) | |
3262 | if (sqe->ioprio || sqe->buf_index) | |
3263 | return -EINVAL; | |
3232dd02 PB |
3264 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3265 | return -EINVAL; | |
3e4827b0 JA |
3266 | |
3267 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3268 | req->epoll.op = READ_ONCE(sqe->len); | |
3269 | req->epoll.fd = READ_ONCE(sqe->off); | |
3270 | ||
3271 | if (ep_op_has_event(req->epoll.op)) { | |
3272 | struct epoll_event __user *ev; | |
3273 | ||
3274 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3275 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3276 | return -EFAULT; | |
3277 | } | |
3278 | ||
3279 | return 0; | |
3280 | #else | |
3281 | return -EOPNOTSUPP; | |
3282 | #endif | |
3283 | } | |
3284 | ||
014db007 | 3285 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock) |
3e4827b0 JA |
3286 | { |
3287 | #if defined(CONFIG_EPOLL) | |
3288 | struct io_epoll *ie = &req->epoll; | |
3289 | int ret; | |
3290 | ||
3291 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3292 | if (force_nonblock && ret == -EAGAIN) | |
3293 | return -EAGAIN; | |
3294 | ||
3295 | if (ret < 0) | |
3296 | req_set_fail_links(req); | |
3297 | io_cqring_add_event(req, ret); | |
014db007 | 3298 | io_put_req(req); |
3e4827b0 JA |
3299 | return 0; |
3300 | #else | |
3301 | return -EOPNOTSUPP; | |
3302 | #endif | |
3303 | } | |
3304 | ||
c1ca757b JA |
3305 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3306 | { | |
3307 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3308 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3309 | return -EINVAL; | |
3232dd02 PB |
3310 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3311 | return -EINVAL; | |
c1ca757b JA |
3312 | |
3313 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3314 | req->madvise.len = READ_ONCE(sqe->len); | |
3315 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3316 | return 0; | |
3317 | #else | |
3318 | return -EOPNOTSUPP; | |
3319 | #endif | |
3320 | } | |
3321 | ||
014db007 | 3322 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3323 | { |
3324 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3325 | struct io_madvise *ma = &req->madvise; | |
3326 | int ret; | |
3327 | ||
3328 | if (force_nonblock) | |
3329 | return -EAGAIN; | |
3330 | ||
3331 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3332 | if (ret < 0) | |
3333 | req_set_fail_links(req); | |
3334 | io_cqring_add_event(req, ret); | |
014db007 | 3335 | io_put_req(req); |
c1ca757b JA |
3336 | return 0; |
3337 | #else | |
3338 | return -EOPNOTSUPP; | |
3339 | #endif | |
3340 | } | |
3341 | ||
4840e418 JA |
3342 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3343 | { | |
3344 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3345 | return -EINVAL; | |
3232dd02 PB |
3346 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3347 | return -EINVAL; | |
4840e418 JA |
3348 | |
3349 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3350 | req->fadvise.len = READ_ONCE(sqe->len); | |
3351 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3352 | return 0; | |
3353 | } | |
3354 | ||
014db007 | 3355 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3356 | { |
3357 | struct io_fadvise *fa = &req->fadvise; | |
3358 | int ret; | |
3359 | ||
3e69426d JA |
3360 | if (force_nonblock) { |
3361 | switch (fa->advice) { | |
3362 | case POSIX_FADV_NORMAL: | |
3363 | case POSIX_FADV_RANDOM: | |
3364 | case POSIX_FADV_SEQUENTIAL: | |
3365 | break; | |
3366 | default: | |
3367 | return -EAGAIN; | |
3368 | } | |
3369 | } | |
4840e418 JA |
3370 | |
3371 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3372 | if (ret < 0) | |
3373 | req_set_fail_links(req); | |
3374 | io_cqring_add_event(req, ret); | |
014db007 | 3375 | io_put_req(req); |
4840e418 JA |
3376 | return 0; |
3377 | } | |
3378 | ||
eddc7ef5 JA |
3379 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3380 | { | |
3232dd02 PB |
3381 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3382 | return -EINVAL; | |
eddc7ef5 JA |
3383 | if (sqe->ioprio || sqe->buf_index) |
3384 | return -EINVAL; | |
9c280f90 | 3385 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3386 | return -EBADF; |
eddc7ef5 | 3387 | |
1d9e1288 BM |
3388 | req->statx.dfd = READ_ONCE(sqe->fd); |
3389 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3390 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3391 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3392 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3393 | |
3394 | return 0; | |
3395 | } | |
3396 | ||
014db007 | 3397 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3398 | { |
1d9e1288 | 3399 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3400 | int ret; |
3401 | ||
5b0bbee4 JA |
3402 | if (force_nonblock) { |
3403 | /* only need file table for an actual valid fd */ | |
3404 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3405 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3406 | return -EAGAIN; |
5b0bbee4 | 3407 | } |
eddc7ef5 | 3408 | |
e62753e4 BM |
3409 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3410 | ctx->buffer); | |
eddc7ef5 | 3411 | |
eddc7ef5 JA |
3412 | if (ret < 0) |
3413 | req_set_fail_links(req); | |
3414 | io_cqring_add_event(req, ret); | |
014db007 | 3415 | io_put_req(req); |
eddc7ef5 JA |
3416 | return 0; |
3417 | } | |
3418 | ||
b5dba59e JA |
3419 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3420 | { | |
3421 | /* | |
3422 | * If we queue this for async, it must not be cancellable. That would | |
3423 | * leave the 'file' in an undeterminate state. | |
3424 | */ | |
3425 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | |
3426 | ||
3232dd02 PB |
3427 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3428 | return -EINVAL; | |
b5dba59e JA |
3429 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3430 | sqe->rw_flags || sqe->buf_index) | |
3431 | return -EINVAL; | |
9c280f90 | 3432 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3433 | return -EBADF; |
b5dba59e JA |
3434 | |
3435 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3436 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3437 | req->close.fd == req->ctx->ring_fd) | |
3438 | return -EBADF; | |
3439 | ||
b5dba59e JA |
3440 | return 0; |
3441 | } | |
3442 | ||
a93b3331 | 3443 | /* only called when __close_fd_get_file() is done */ |
014db007 | 3444 | static void __io_close_finish(struct io_kiocb *req) |
a93b3331 PB |
3445 | { |
3446 | int ret; | |
3447 | ||
3448 | ret = filp_close(req->close.put_file, req->work.files); | |
3449 | if (ret < 0) | |
3450 | req_set_fail_links(req); | |
3451 | io_cqring_add_event(req, ret); | |
3452 | fput(req->close.put_file); | |
014db007 | 3453 | io_put_req(req); |
a93b3331 PB |
3454 | } |
3455 | ||
b5dba59e JA |
3456 | static void io_close_finish(struct io_wq_work **workptr) |
3457 | { | |
3458 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
b5dba59e | 3459 | |
7fbeb95d | 3460 | /* not cancellable, don't do io_req_cancelled() */ |
014db007 | 3461 | __io_close_finish(req); |
e9fd9396 | 3462 | io_steal_work(req, workptr); |
b5dba59e JA |
3463 | } |
3464 | ||
014db007 | 3465 | static int io_close(struct io_kiocb *req, bool force_nonblock) |
b5dba59e JA |
3466 | { |
3467 | int ret; | |
3468 | ||
3469 | req->close.put_file = NULL; | |
3470 | ret = __close_fd_get_file(req->close.fd, &req->close.put_file); | |
3471 | if (ret < 0) | |
0bf0eefd | 3472 | return (ret == -ENOENT) ? -EBADF : ret; |
b5dba59e JA |
3473 | |
3474 | /* if the file has a flush method, be safe and punt to async */ | |
a2100672 | 3475 | if (req->close.put_file->f_op->flush && force_nonblock) { |
0bf0eefd PB |
3476 | /* avoid grabbing files - we don't need the files */ |
3477 | req->flags |= REQ_F_NO_FILE_TABLE | REQ_F_MUST_PUNT; | |
a2100672 | 3478 | req->work.func = io_close_finish; |
0bf0eefd | 3479 | return -EAGAIN; |
a2100672 | 3480 | } |
b5dba59e JA |
3481 | |
3482 | /* | |
3483 | * No ->flush(), safely close from here and just punt the | |
3484 | * fput() to async context. | |
3485 | */ | |
014db007 | 3486 | __io_close_finish(req); |
1a417f4e | 3487 | return 0; |
b5dba59e JA |
3488 | } |
3489 | ||
3529d8c2 | 3490 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3491 | { |
3492 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3493 | |
3494 | if (!req->file) | |
3495 | return -EBADF; | |
5d17b4a4 JA |
3496 | |
3497 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3498 | return -EINVAL; | |
3499 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3500 | return -EINVAL; | |
3501 | ||
8ed8d3c3 JA |
3502 | req->sync.off = READ_ONCE(sqe->off); |
3503 | req->sync.len = READ_ONCE(sqe->len); | |
3504 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3505 | return 0; |
3506 | } | |
3507 | ||
014db007 | 3508 | static void __io_sync_file_range(struct io_kiocb *req) |
8ed8d3c3 | 3509 | { |
8ed8d3c3 JA |
3510 | int ret; |
3511 | ||
9adbd45d | 3512 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3513 | req->sync.flags); |
3514 | if (ret < 0) | |
3515 | req_set_fail_links(req); | |
3516 | io_cqring_add_event(req, ret); | |
014db007 | 3517 | io_put_req(req); |
5ea62161 PB |
3518 | } |
3519 | ||
3520 | ||
3521 | static void io_sync_file_range_finish(struct io_wq_work **workptr) | |
3522 | { | |
3523 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
5ea62161 PB |
3524 | |
3525 | if (io_req_cancelled(req)) | |
3526 | return; | |
014db007 | 3527 | __io_sync_file_range(req); |
7759a0bf | 3528 | io_steal_work(req, workptr); |
5d17b4a4 JA |
3529 | } |
3530 | ||
014db007 | 3531 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3532 | { |
5d17b4a4 | 3533 | /* sync_file_range always requires a blocking context */ |
8ed8d3c3 | 3534 | if (force_nonblock) { |
8ed8d3c3 | 3535 | req->work.func = io_sync_file_range_finish; |
5d17b4a4 | 3536 | return -EAGAIN; |
8ed8d3c3 | 3537 | } |
5d17b4a4 | 3538 | |
014db007 | 3539 | __io_sync_file_range(req); |
5d17b4a4 JA |
3540 | return 0; |
3541 | } | |
3542 | ||
469956e8 | 3543 | #if defined(CONFIG_NET) |
02d27d89 PB |
3544 | static int io_setup_async_msg(struct io_kiocb *req, |
3545 | struct io_async_msghdr *kmsg) | |
3546 | { | |
3547 | if (req->io) | |
3548 | return -EAGAIN; | |
3549 | if (io_alloc_async_ctx(req)) { | |
3550 | if (kmsg->iov != kmsg->fast_iov) | |
3551 | kfree(kmsg->iov); | |
3552 | return -ENOMEM; | |
3553 | } | |
3554 | req->flags |= REQ_F_NEED_CLEANUP; | |
3555 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3556 | return -EAGAIN; | |
3557 | } | |
3558 | ||
3529d8c2 | 3559 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3560 | { |
e47293fd | 3561 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3562 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3563 | int ret; |
03b1230c | 3564 | |
d2b6f48b PB |
3565 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3566 | return -EINVAL; | |
3567 | ||
e47293fd JA |
3568 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3569 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
fddaface | 3570 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3571 | |
d8768362 JA |
3572 | #ifdef CONFIG_COMPAT |
3573 | if (req->ctx->compat) | |
3574 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3575 | #endif | |
3576 | ||
fddaface | 3577 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3578 | return 0; |
5f798bea PB |
3579 | /* iovec is already imported */ |
3580 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3581 | return 0; | |
3529d8c2 | 3582 | |
d9688565 | 3583 | io->msg.iov = io->msg.fast_iov; |
99bc4c38 | 3584 | ret = sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags, |
e47293fd | 3585 | &io->msg.iov); |
99bc4c38 PB |
3586 | if (!ret) |
3587 | req->flags |= REQ_F_NEED_CLEANUP; | |
3588 | return ret; | |
03b1230c JA |
3589 | } |
3590 | ||
014db007 | 3591 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3592 | { |
0b416c3e | 3593 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3594 | struct socket *sock; |
3595 | int ret; | |
3596 | ||
0fa03c62 JA |
3597 | sock = sock_from_file(req->file, &ret); |
3598 | if (sock) { | |
b7bb4f7d | 3599 | struct io_async_ctx io; |
0fa03c62 JA |
3600 | unsigned flags; |
3601 | ||
03b1230c | 3602 | if (req->io) { |
0b416c3e | 3603 | kmsg = &req->io->msg; |
b537916c | 3604 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3605 | /* if iov is set, it's allocated already */ |
3606 | if (!kmsg->iov) | |
3607 | kmsg->iov = kmsg->fast_iov; | |
3608 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3609 | } else { |
3529d8c2 JA |
3610 | struct io_sr_msg *sr = &req->sr_msg; |
3611 | ||
0b416c3e | 3612 | kmsg = &io.msg; |
b537916c | 3613 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 JA |
3614 | |
3615 | io.msg.iov = io.msg.fast_iov; | |
3616 | ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, | |
3617 | sr->msg_flags, &io.msg.iov); | |
03b1230c | 3618 | if (ret) |
3529d8c2 | 3619 | return ret; |
03b1230c | 3620 | } |
0fa03c62 | 3621 | |
e47293fd JA |
3622 | flags = req->sr_msg.msg_flags; |
3623 | if (flags & MSG_DONTWAIT) | |
3624 | req->flags |= REQ_F_NOWAIT; | |
3625 | else if (force_nonblock) | |
3626 | flags |= MSG_DONTWAIT; | |
3627 | ||
0b416c3e | 3628 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3629 | if (force_nonblock && ret == -EAGAIN) |
3630 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3631 | if (ret == -ERESTARTSYS) |
3632 | ret = -EINTR; | |
0fa03c62 JA |
3633 | } |
3634 | ||
1e95081c | 3635 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3636 | kfree(kmsg->iov); |
99bc4c38 | 3637 | req->flags &= ~REQ_F_NEED_CLEANUP; |
78e19bbe | 3638 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
3639 | if (ret < 0) |
3640 | req_set_fail_links(req); | |
014db007 | 3641 | io_put_req(req); |
5d17b4a4 | 3642 | return 0; |
03b1230c | 3643 | } |
aa1fa28f | 3644 | |
014db007 | 3645 | static int io_send(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3646 | { |
fddaface JA |
3647 | struct socket *sock; |
3648 | int ret; | |
3649 | ||
fddaface JA |
3650 | sock = sock_from_file(req->file, &ret); |
3651 | if (sock) { | |
3652 | struct io_sr_msg *sr = &req->sr_msg; | |
3653 | struct msghdr msg; | |
3654 | struct iovec iov; | |
3655 | unsigned flags; | |
3656 | ||
3657 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3658 | &msg.msg_iter); | |
3659 | if (ret) | |
3660 | return ret; | |
3661 | ||
3662 | msg.msg_name = NULL; | |
3663 | msg.msg_control = NULL; | |
3664 | msg.msg_controllen = 0; | |
3665 | msg.msg_namelen = 0; | |
3666 | ||
3667 | flags = req->sr_msg.msg_flags; | |
3668 | if (flags & MSG_DONTWAIT) | |
3669 | req->flags |= REQ_F_NOWAIT; | |
3670 | else if (force_nonblock) | |
3671 | flags |= MSG_DONTWAIT; | |
3672 | ||
0b7b21e4 JA |
3673 | msg.msg_flags = flags; |
3674 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3675 | if (force_nonblock && ret == -EAGAIN) |
3676 | return -EAGAIN; | |
3677 | if (ret == -ERESTARTSYS) | |
3678 | ret = -EINTR; | |
3679 | } | |
3680 | ||
3681 | io_cqring_add_event(req, ret); | |
3682 | if (ret < 0) | |
3683 | req_set_fail_links(req); | |
014db007 | 3684 | io_put_req(req); |
fddaface | 3685 | return 0; |
fddaface JA |
3686 | } |
3687 | ||
52de1fe1 JA |
3688 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) |
3689 | { | |
3690 | struct io_sr_msg *sr = &req->sr_msg; | |
3691 | struct iovec __user *uiov; | |
3692 | size_t iov_len; | |
3693 | int ret; | |
3694 | ||
3695 | ret = __copy_msghdr_from_user(&io->msg.msg, sr->msg, &io->msg.uaddr, | |
3696 | &uiov, &iov_len); | |
3697 | if (ret) | |
3698 | return ret; | |
3699 | ||
3700 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3701 | if (iov_len > 1) | |
3702 | return -EINVAL; | |
3703 | if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov))) | |
3704 | return -EFAULT; | |
3705 | sr->len = io->msg.iov[0].iov_len; | |
3706 | iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1, | |
3707 | sr->len); | |
3708 | io->msg.iov = NULL; | |
3709 | } else { | |
3710 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
3711 | &io->msg.iov, &io->msg.msg.msg_iter); | |
3712 | if (ret > 0) | |
3713 | ret = 0; | |
3714 | } | |
3715 | ||
3716 | return ret; | |
3717 | } | |
3718 | ||
3719 | #ifdef CONFIG_COMPAT | |
3720 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
3721 | struct io_async_ctx *io) | |
3722 | { | |
3723 | struct compat_msghdr __user *msg_compat; | |
3724 | struct io_sr_msg *sr = &req->sr_msg; | |
3725 | struct compat_iovec __user *uiov; | |
3726 | compat_uptr_t ptr; | |
3727 | compat_size_t len; | |
3728 | int ret; | |
3729 | ||
3730 | msg_compat = (struct compat_msghdr __user *) sr->msg; | |
3731 | ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr, | |
3732 | &ptr, &len); | |
3733 | if (ret) | |
3734 | return ret; | |
3735 | ||
3736 | uiov = compat_ptr(ptr); | |
3737 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3738 | compat_ssize_t clen; | |
3739 | ||
3740 | if (len > 1) | |
3741 | return -EINVAL; | |
3742 | if (!access_ok(uiov, sizeof(*uiov))) | |
3743 | return -EFAULT; | |
3744 | if (__get_user(clen, &uiov->iov_len)) | |
3745 | return -EFAULT; | |
3746 | if (clen < 0) | |
3747 | return -EINVAL; | |
3748 | sr->len = io->msg.iov[0].iov_len; | |
3749 | io->msg.iov = NULL; | |
3750 | } else { | |
3751 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
3752 | &io->msg.iov, | |
3753 | &io->msg.msg.msg_iter); | |
3754 | if (ret < 0) | |
3755 | return ret; | |
3756 | } | |
3757 | ||
3758 | return 0; | |
3759 | } | |
3760 | #endif | |
3761 | ||
3762 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) | |
3763 | { | |
3764 | io->msg.iov = io->msg.fast_iov; | |
3765 | ||
3766 | #ifdef CONFIG_COMPAT | |
3767 | if (req->ctx->compat) | |
3768 | return __io_compat_recvmsg_copy_hdr(req, io); | |
fddaface | 3769 | #endif |
52de1fe1 JA |
3770 | |
3771 | return __io_recvmsg_copy_hdr(req, io); | |
3772 | } | |
3773 | ||
bcda7baa JA |
3774 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
3775 | int *cflags, bool needs_lock) | |
3776 | { | |
3777 | struct io_sr_msg *sr = &req->sr_msg; | |
3778 | struct io_buffer *kbuf; | |
3779 | ||
3780 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
3781 | return NULL; | |
3782 | ||
3783 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
3784 | if (IS_ERR(kbuf)) | |
3785 | return kbuf; | |
3786 | ||
3787 | sr->kbuf = kbuf; | |
3788 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3789 | ||
3790 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
3791 | *cflags |= IORING_CQE_F_BUFFER; | |
3792 | return kbuf; | |
fddaface JA |
3793 | } |
3794 | ||
3529d8c2 JA |
3795 | static int io_recvmsg_prep(struct io_kiocb *req, |
3796 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 3797 | { |
e47293fd | 3798 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3799 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3800 | int ret; |
3529d8c2 | 3801 | |
d2b6f48b PB |
3802 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3803 | return -EINVAL; | |
3804 | ||
3529d8c2 JA |
3805 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3806 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
0b7b21e4 | 3807 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 3808 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 3809 | |
d8768362 JA |
3810 | #ifdef CONFIG_COMPAT |
3811 | if (req->ctx->compat) | |
3812 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3813 | #endif | |
3814 | ||
fddaface | 3815 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 3816 | return 0; |
5f798bea PB |
3817 | /* iovec is already imported */ |
3818 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3819 | return 0; | |
03b1230c | 3820 | |
52de1fe1 | 3821 | ret = io_recvmsg_copy_hdr(req, io); |
99bc4c38 PB |
3822 | if (!ret) |
3823 | req->flags |= REQ_F_NEED_CLEANUP; | |
3824 | return ret; | |
aa1fa28f JA |
3825 | } |
3826 | ||
014db007 | 3827 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3828 | { |
0b416c3e | 3829 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 3830 | struct socket *sock; |
52de1fe1 | 3831 | int ret, cflags = 0; |
03b1230c | 3832 | |
03b1230c JA |
3833 | sock = sock_from_file(req->file, &ret); |
3834 | if (sock) { | |
52de1fe1 | 3835 | struct io_buffer *kbuf; |
b7bb4f7d | 3836 | struct io_async_ctx io; |
03b1230c JA |
3837 | unsigned flags; |
3838 | ||
03b1230c | 3839 | if (req->io) { |
0b416c3e | 3840 | kmsg = &req->io->msg; |
b537916c | 3841 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3842 | /* if iov is set, it's allocated already */ |
3843 | if (!kmsg->iov) | |
3844 | kmsg->iov = kmsg->fast_iov; | |
3845 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3846 | } else { |
0b416c3e | 3847 | kmsg = &io.msg; |
b537916c | 3848 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 | 3849 | |
52de1fe1 | 3850 | ret = io_recvmsg_copy_hdr(req, &io); |
03b1230c | 3851 | if (ret) |
3529d8c2 | 3852 | return ret; |
03b1230c JA |
3853 | } |
3854 | ||
52de1fe1 JA |
3855 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3856 | if (IS_ERR(kbuf)) { | |
3857 | return PTR_ERR(kbuf); | |
3858 | } else if (kbuf) { | |
3859 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3860 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
3861 | 1, req->sr_msg.len); | |
3862 | } | |
3863 | ||
e47293fd JA |
3864 | flags = req->sr_msg.msg_flags; |
3865 | if (flags & MSG_DONTWAIT) | |
3866 | req->flags |= REQ_F_NOWAIT; | |
3867 | else if (force_nonblock) | |
3868 | flags |= MSG_DONTWAIT; | |
3869 | ||
3870 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, | |
3871 | kmsg->uaddr, flags); | |
02d27d89 PB |
3872 | if (force_nonblock && ret == -EAGAIN) |
3873 | return io_setup_async_msg(req, kmsg); | |
03b1230c JA |
3874 | if (ret == -ERESTARTSYS) |
3875 | ret = -EINTR; | |
3876 | } | |
3877 | ||
1e95081c | 3878 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3879 | kfree(kmsg->iov); |
99bc4c38 | 3880 | req->flags &= ~REQ_F_NEED_CLEANUP; |
52de1fe1 | 3881 | __io_cqring_add_event(req, ret, cflags); |
4e88d6e7 JA |
3882 | if (ret < 0) |
3883 | req_set_fail_links(req); | |
014db007 | 3884 | io_put_req(req); |
03b1230c | 3885 | return 0; |
0fa03c62 | 3886 | } |
5d17b4a4 | 3887 | |
014db007 | 3888 | static int io_recv(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3889 | { |
bcda7baa | 3890 | struct io_buffer *kbuf = NULL; |
fddaface | 3891 | struct socket *sock; |
bcda7baa | 3892 | int ret, cflags = 0; |
fddaface | 3893 | |
fddaface JA |
3894 | sock = sock_from_file(req->file, &ret); |
3895 | if (sock) { | |
3896 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 3897 | void __user *buf = sr->buf; |
fddaface JA |
3898 | struct msghdr msg; |
3899 | struct iovec iov; | |
3900 | unsigned flags; | |
3901 | ||
bcda7baa JA |
3902 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3903 | if (IS_ERR(kbuf)) | |
3904 | return PTR_ERR(kbuf); | |
3905 | else if (kbuf) | |
3906 | buf = u64_to_user_ptr(kbuf->addr); | |
3907 | ||
3908 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 3909 | &msg.msg_iter); |
bcda7baa JA |
3910 | if (ret) { |
3911 | kfree(kbuf); | |
fddaface | 3912 | return ret; |
bcda7baa | 3913 | } |
fddaface | 3914 | |
bcda7baa | 3915 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
3916 | msg.msg_name = NULL; |
3917 | msg.msg_control = NULL; | |
3918 | msg.msg_controllen = 0; | |
3919 | msg.msg_namelen = 0; | |
3920 | msg.msg_iocb = NULL; | |
3921 | msg.msg_flags = 0; | |
3922 | ||
3923 | flags = req->sr_msg.msg_flags; | |
3924 | if (flags & MSG_DONTWAIT) | |
3925 | req->flags |= REQ_F_NOWAIT; | |
3926 | else if (force_nonblock) | |
3927 | flags |= MSG_DONTWAIT; | |
3928 | ||
0b7b21e4 | 3929 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
3930 | if (force_nonblock && ret == -EAGAIN) |
3931 | return -EAGAIN; | |
3932 | if (ret == -ERESTARTSYS) | |
3933 | ret = -EINTR; | |
3934 | } | |
3935 | ||
bcda7baa JA |
3936 | kfree(kbuf); |
3937 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3938 | __io_cqring_add_event(req, ret, cflags); | |
fddaface JA |
3939 | if (ret < 0) |
3940 | req_set_fail_links(req); | |
014db007 | 3941 | io_put_req(req); |
fddaface | 3942 | return 0; |
fddaface JA |
3943 | } |
3944 | ||
3529d8c2 | 3945 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 3946 | { |
8ed8d3c3 JA |
3947 | struct io_accept *accept = &req->accept; |
3948 | ||
17f2fe35 JA |
3949 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3950 | return -EINVAL; | |
8042d6ce | 3951 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
3952 | return -EINVAL; |
3953 | ||
d55e5f5b JA |
3954 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3955 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 3956 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 3957 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 3958 | return 0; |
8ed8d3c3 | 3959 | } |
17f2fe35 | 3960 | |
014db007 | 3961 | static int __io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 JA |
3962 | { |
3963 | struct io_accept *accept = &req->accept; | |
3964 | unsigned file_flags; | |
3965 | int ret; | |
3966 | ||
3967 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
3968 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, | |
09952e3e JA |
3969 | accept->addr_len, accept->flags, |
3970 | accept->nofile); | |
8ed8d3c3 | 3971 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 3972 | return -EAGAIN; |
8e3cca12 JA |
3973 | if (ret == -ERESTARTSYS) |
3974 | ret = -EINTR; | |
4e88d6e7 JA |
3975 | if (ret < 0) |
3976 | req_set_fail_links(req); | |
78e19bbe | 3977 | io_cqring_add_event(req, ret); |
014db007 | 3978 | io_put_req(req); |
17f2fe35 | 3979 | return 0; |
8ed8d3c3 JA |
3980 | } |
3981 | ||
3982 | static void io_accept_finish(struct io_wq_work **workptr) | |
3983 | { | |
3984 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
8ed8d3c3 JA |
3985 | |
3986 | if (io_req_cancelled(req)) | |
3987 | return; | |
014db007 | 3988 | __io_accept(req, false); |
e9fd9396 | 3989 | io_steal_work(req, workptr); |
8ed8d3c3 | 3990 | } |
8ed8d3c3 | 3991 | |
014db007 | 3992 | static int io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3993 | { |
8ed8d3c3 JA |
3994 | int ret; |
3995 | ||
014db007 | 3996 | ret = __io_accept(req, force_nonblock); |
8ed8d3c3 JA |
3997 | if (ret == -EAGAIN && force_nonblock) { |
3998 | req->work.func = io_accept_finish; | |
8ed8d3c3 JA |
3999 | return -EAGAIN; |
4000 | } | |
4001 | return 0; | |
0fa03c62 | 4002 | } |
5d17b4a4 | 4003 | |
3529d8c2 | 4004 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4005 | { |
3529d8c2 JA |
4006 | struct io_connect *conn = &req->connect; |
4007 | struct io_async_ctx *io = req->io; | |
f499a021 | 4008 | |
3fbb51c1 JA |
4009 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4010 | return -EINVAL; | |
4011 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4012 | return -EINVAL; | |
4013 | ||
3529d8c2 JA |
4014 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4015 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4016 | ||
4017 | if (!io) | |
4018 | return 0; | |
4019 | ||
4020 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4021 | &io->connect.address); |
f499a021 JA |
4022 | } |
4023 | ||
014db007 | 4024 | static int io_connect(struct io_kiocb *req, bool force_nonblock) |
f8e85cf2 | 4025 | { |
f499a021 | 4026 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4027 | unsigned file_flags; |
3fbb51c1 | 4028 | int ret; |
f8e85cf2 | 4029 | |
f499a021 JA |
4030 | if (req->io) { |
4031 | io = req->io; | |
4032 | } else { | |
3529d8c2 JA |
4033 | ret = move_addr_to_kernel(req->connect.addr, |
4034 | req->connect.addr_len, | |
4035 | &__io.connect.address); | |
f499a021 JA |
4036 | if (ret) |
4037 | goto out; | |
4038 | io = &__io; | |
4039 | } | |
4040 | ||
3fbb51c1 JA |
4041 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4042 | ||
4043 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4044 | req->connect.addr_len, file_flags); | |
87f80d62 | 4045 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4046 | if (req->io) |
4047 | return -EAGAIN; | |
4048 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4049 | ret = -ENOMEM; |
4050 | goto out; | |
4051 | } | |
b7bb4f7d | 4052 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4053 | return -EAGAIN; |
f499a021 | 4054 | } |
f8e85cf2 JA |
4055 | if (ret == -ERESTARTSYS) |
4056 | ret = -EINTR; | |
f499a021 | 4057 | out: |
4e88d6e7 JA |
4058 | if (ret < 0) |
4059 | req_set_fail_links(req); | |
f8e85cf2 | 4060 | io_cqring_add_event(req, ret); |
014db007 | 4061 | io_put_req(req); |
f8e85cf2 | 4062 | return 0; |
469956e8 Y |
4063 | } |
4064 | #else /* !CONFIG_NET */ | |
4065 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4066 | { | |
f8e85cf2 | 4067 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4068 | } |
4069 | ||
469956e8 Y |
4070 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
4071 | { | |
4072 | return -EOPNOTSUPP; | |
4073 | } | |
4074 | ||
4075 | static int io_send(struct io_kiocb *req, bool force_nonblock) | |
4076 | { | |
4077 | return -EOPNOTSUPP; | |
4078 | } | |
4079 | ||
4080 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4081 | const struct io_uring_sqe *sqe) | |
4082 | { | |
4083 | return -EOPNOTSUPP; | |
4084 | } | |
4085 | ||
4086 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) | |
4087 | { | |
4088 | return -EOPNOTSUPP; | |
4089 | } | |
4090 | ||
4091 | static int io_recv(struct io_kiocb *req, bool force_nonblock) | |
4092 | { | |
4093 | return -EOPNOTSUPP; | |
4094 | } | |
4095 | ||
4096 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4097 | { | |
4098 | return -EOPNOTSUPP; | |
4099 | } | |
4100 | ||
4101 | static int io_accept(struct io_kiocb *req, bool force_nonblock) | |
4102 | { | |
4103 | return -EOPNOTSUPP; | |
4104 | } | |
4105 | ||
4106 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4107 | { | |
4108 | return -EOPNOTSUPP; | |
4109 | } | |
4110 | ||
4111 | static int io_connect(struct io_kiocb *req, bool force_nonblock) | |
4112 | { | |
f8e85cf2 | 4113 | return -EOPNOTSUPP; |
f8e85cf2 | 4114 | } |
469956e8 | 4115 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4116 | |
d7718a9d JA |
4117 | struct io_poll_table { |
4118 | struct poll_table_struct pt; | |
4119 | struct io_kiocb *req; | |
4120 | int error; | |
4121 | }; | |
4122 | ||
d7718a9d JA |
4123 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4124 | __poll_t mask, task_work_func_t func) | |
4125 | { | |
4126 | struct task_struct *tsk; | |
aa96bf8a | 4127 | int ret; |
d7718a9d JA |
4128 | |
4129 | /* for instances that support it check for an event match first: */ | |
4130 | if (mask && !(mask & poll->events)) | |
4131 | return 0; | |
4132 | ||
4133 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4134 | ||
4135 | list_del_init(&poll->wait.entry); | |
4136 | ||
4137 | tsk = req->task; | |
4138 | req->result = mask; | |
4139 | init_task_work(&req->task_work, func); | |
4140 | /* | |
e3aabf95 JA |
4141 | * If this fails, then the task is exiting. When a task exits, the |
4142 | * work gets canceled, so just cancel this request as well instead | |
4143 | * of executing it. We can't safely execute it anyway, as we may not | |
4144 | * have the needed state needed for it anyway. | |
d7718a9d | 4145 | */ |
aa96bf8a JA |
4146 | ret = task_work_add(tsk, &req->task_work, true); |
4147 | if (unlikely(ret)) { | |
e3aabf95 | 4148 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a JA |
4149 | tsk = io_wq_get_task(req->ctx->io_wq); |
4150 | task_work_add(tsk, &req->task_work, true); | |
4151 | } | |
d7718a9d JA |
4152 | wake_up_process(tsk); |
4153 | return 1; | |
4154 | } | |
4155 | ||
74ce6ce4 JA |
4156 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4157 | __acquires(&req->ctx->completion_lock) | |
4158 | { | |
4159 | struct io_ring_ctx *ctx = req->ctx; | |
4160 | ||
4161 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4162 | struct poll_table_struct pt = { ._key = poll->events }; | |
4163 | ||
4164 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4165 | } | |
4166 | ||
4167 | spin_lock_irq(&ctx->completion_lock); | |
4168 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4169 | add_wait_queue(poll->head, &poll->wait); | |
4170 | return true; | |
4171 | } | |
4172 | ||
4173 | return false; | |
4174 | } | |
4175 | ||
18bceab1 JA |
4176 | static void io_poll_remove_double(struct io_kiocb *req) |
4177 | { | |
4178 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4179 | ||
4180 | lockdep_assert_held(&req->ctx->completion_lock); | |
4181 | ||
4182 | if (poll && poll->head) { | |
4183 | struct wait_queue_head *head = poll->head; | |
4184 | ||
4185 | spin_lock(&head->lock); | |
4186 | list_del_init(&poll->wait.entry); | |
4187 | if (poll->wait.private) | |
4188 | refcount_dec(&req->refs); | |
4189 | poll->head = NULL; | |
4190 | spin_unlock(&head->lock); | |
4191 | } | |
4192 | } | |
4193 | ||
4194 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4195 | { | |
4196 | struct io_ring_ctx *ctx = req->ctx; | |
4197 | ||
4198 | io_poll_remove_double(req); | |
4199 | req->poll.done = true; | |
4200 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4201 | io_commit_cqring(ctx); | |
4202 | } | |
4203 | ||
4204 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4205 | { | |
4206 | struct io_ring_ctx *ctx = req->ctx; | |
4207 | ||
4208 | if (io_poll_rewait(req, &req->poll)) { | |
4209 | spin_unlock_irq(&ctx->completion_lock); | |
4210 | return; | |
4211 | } | |
4212 | ||
4213 | hash_del(&req->hash_node); | |
4214 | io_poll_complete(req, req->result, 0); | |
4215 | req->flags |= REQ_F_COMP_LOCKED; | |
4216 | io_put_req_find_next(req, nxt); | |
4217 | spin_unlock_irq(&ctx->completion_lock); | |
4218 | ||
4219 | io_cqring_ev_posted(ctx); | |
4220 | } | |
4221 | ||
4222 | static void io_poll_task_func(struct callback_head *cb) | |
4223 | { | |
4224 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4225 | struct io_kiocb *nxt = NULL; | |
4226 | ||
4227 | io_poll_task_handler(req, &nxt); | |
4228 | if (nxt) { | |
4229 | struct io_ring_ctx *ctx = nxt->ctx; | |
4230 | ||
4231 | mutex_lock(&ctx->uring_lock); | |
4232 | __io_queue_sqe(nxt, NULL); | |
4233 | mutex_unlock(&ctx->uring_lock); | |
4234 | } | |
4235 | } | |
4236 | ||
4237 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4238 | int sync, void *key) | |
4239 | { | |
4240 | struct io_kiocb *req = wait->private; | |
4241 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4242 | __poll_t mask = key_to_poll(key); | |
4243 | ||
4244 | /* for instances that support it check for an event match first: */ | |
4245 | if (mask && !(mask & poll->events)) | |
4246 | return 0; | |
4247 | ||
4248 | if (req->poll.head) { | |
4249 | bool done; | |
4250 | ||
4251 | spin_lock(&req->poll.head->lock); | |
4252 | done = list_empty(&req->poll.wait.entry); | |
4253 | if (!done) | |
4254 | list_del_init(&req->poll.wait.entry); | |
4255 | spin_unlock(&req->poll.head->lock); | |
4256 | if (!done) | |
4257 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4258 | } | |
4259 | refcount_dec(&req->refs); | |
4260 | return 1; | |
4261 | } | |
4262 | ||
4263 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4264 | wait_queue_func_t wake_func) | |
4265 | { | |
4266 | poll->head = NULL; | |
4267 | poll->done = false; | |
4268 | poll->canceled = false; | |
4269 | poll->events = events; | |
4270 | INIT_LIST_HEAD(&poll->wait.entry); | |
4271 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4272 | } | |
4273 | ||
4274 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
4275 | struct wait_queue_head *head) | |
4276 | { | |
4277 | struct io_kiocb *req = pt->req; | |
4278 | ||
4279 | /* | |
4280 | * If poll->head is already set, it's because the file being polled | |
4281 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4282 | * for write). Setup a separate io_poll_iocb if this happens. | |
4283 | */ | |
4284 | if (unlikely(poll->head)) { | |
4285 | /* already have a 2nd entry, fail a third attempt */ | |
4286 | if (req->io) { | |
4287 | pt->error = -EINVAL; | |
4288 | return; | |
4289 | } | |
4290 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4291 | if (!poll) { | |
4292 | pt->error = -ENOMEM; | |
4293 | return; | |
4294 | } | |
4295 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4296 | refcount_inc(&req->refs); | |
4297 | poll->wait.private = req; | |
4298 | req->io = (void *) poll; | |
4299 | } | |
4300 | ||
4301 | pt->error = 0; | |
4302 | poll->head = head; | |
4303 | add_wait_queue(head, &poll->wait); | |
4304 | } | |
4305 | ||
4306 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4307 | struct poll_table_struct *p) | |
4308 | { | |
4309 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4310 | ||
4311 | __io_queue_proc(&pt->req->apoll->poll, pt, head); | |
4312 | } | |
4313 | ||
d7718a9d JA |
4314 | static void io_async_task_func(struct callback_head *cb) |
4315 | { | |
4316 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4317 | struct async_poll *apoll = req->apoll; | |
4318 | struct io_ring_ctx *ctx = req->ctx; | |
31067255 | 4319 | bool canceled = false; |
d7718a9d JA |
4320 | |
4321 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4322 | ||
74ce6ce4 | 4323 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4324 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4325 | return; |
d7718a9d JA |
4326 | } |
4327 | ||
31067255 JA |
4328 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
4329 | if (hash_hashed(&req->hash_node)) { | |
74ce6ce4 | 4330 | hash_del(&req->hash_node); |
31067255 JA |
4331 | } else { |
4332 | canceled = READ_ONCE(apoll->poll.canceled); | |
4333 | if (canceled) { | |
4334 | io_cqring_fill_event(req, -ECANCELED); | |
4335 | io_commit_cqring(ctx); | |
4336 | } | |
2bae047e JA |
4337 | } |
4338 | ||
74ce6ce4 JA |
4339 | spin_unlock_irq(&ctx->completion_lock); |
4340 | ||
44575a67 XW |
4341 | /* restore ->work in case we need to retry again */ |
4342 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
31067255 | 4343 | kfree(apoll); |
44575a67 | 4344 | |
31067255 JA |
4345 | if (!canceled) { |
4346 | __set_current_state(TASK_RUNNING); | |
4347 | mutex_lock(&ctx->uring_lock); | |
4348 | __io_queue_sqe(req, NULL); | |
4349 | mutex_unlock(&ctx->uring_lock); | |
4350 | } else { | |
2bae047e JA |
4351 | io_cqring_ev_posted(ctx); |
4352 | req_set_fail_links(req); | |
44575a67 | 4353 | io_double_put_req(req); |
2bae047e | 4354 | } |
d7718a9d JA |
4355 | } |
4356 | ||
4357 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4358 | void *key) | |
4359 | { | |
4360 | struct io_kiocb *req = wait->private; | |
4361 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4362 | ||
4363 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4364 | key_to_poll(key)); | |
4365 | ||
4366 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4367 | } | |
4368 | ||
4369 | static void io_poll_req_insert(struct io_kiocb *req) | |
4370 | { | |
4371 | struct io_ring_ctx *ctx = req->ctx; | |
4372 | struct hlist_head *list; | |
4373 | ||
4374 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4375 | hlist_add_head(&req->hash_node, list); | |
4376 | } | |
4377 | ||
4378 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4379 | struct io_poll_iocb *poll, | |
4380 | struct io_poll_table *ipt, __poll_t mask, | |
4381 | wait_queue_func_t wake_func) | |
4382 | __acquires(&ctx->completion_lock) | |
4383 | { | |
4384 | struct io_ring_ctx *ctx = req->ctx; | |
4385 | bool cancel = false; | |
4386 | ||
4387 | poll->file = req->file; | |
18bceab1 JA |
4388 | io_init_poll_iocb(poll, mask, wake_func); |
4389 | poll->wait.private = req; | |
d7718a9d JA |
4390 | |
4391 | ipt->pt._key = mask; | |
4392 | ipt->req = req; | |
4393 | ipt->error = -EINVAL; | |
4394 | ||
d7718a9d JA |
4395 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4396 | ||
4397 | spin_lock_irq(&ctx->completion_lock); | |
4398 | if (likely(poll->head)) { | |
4399 | spin_lock(&poll->head->lock); | |
4400 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4401 | if (ipt->error) | |
4402 | cancel = true; | |
4403 | ipt->error = 0; | |
4404 | mask = 0; | |
4405 | } | |
4406 | if (mask || ipt->error) | |
4407 | list_del_init(&poll->wait.entry); | |
4408 | else if (cancel) | |
4409 | WRITE_ONCE(poll->canceled, true); | |
4410 | else if (!poll->done) /* actually waiting for an event */ | |
4411 | io_poll_req_insert(req); | |
4412 | spin_unlock(&poll->head->lock); | |
4413 | } | |
4414 | ||
4415 | return mask; | |
4416 | } | |
4417 | ||
4418 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4419 | { | |
4420 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4421 | struct io_ring_ctx *ctx = req->ctx; | |
4422 | struct async_poll *apoll; | |
4423 | struct io_poll_table ipt; | |
4424 | __poll_t mask, ret; | |
18bceab1 | 4425 | bool had_io; |
d7718a9d JA |
4426 | |
4427 | if (!req->file || !file_can_poll(req->file)) | |
4428 | return false; | |
4429 | if (req->flags & (REQ_F_MUST_PUNT | REQ_F_POLLED)) | |
4430 | return false; | |
4431 | if (!def->pollin && !def->pollout) | |
4432 | return false; | |
4433 | ||
4434 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4435 | if (unlikely(!apoll)) | |
4436 | return false; | |
4437 | ||
4438 | req->flags |= REQ_F_POLLED; | |
4439 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
18bceab1 | 4440 | had_io = req->io != NULL; |
d7718a9d | 4441 | |
3537b6a7 | 4442 | get_task_struct(current); |
d7718a9d JA |
4443 | req->task = current; |
4444 | req->apoll = apoll; | |
4445 | INIT_HLIST_NODE(&req->hash_node); | |
4446 | ||
8755d97a | 4447 | mask = 0; |
d7718a9d | 4448 | if (def->pollin) |
8755d97a | 4449 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4450 | if (def->pollout) |
4451 | mask |= POLLOUT | POLLWRNORM; | |
4452 | mask |= POLLERR | POLLPRI; | |
4453 | ||
4454 | ipt.pt._qproc = io_async_queue_proc; | |
4455 | ||
4456 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4457 | io_async_wake); | |
4458 | if (ret) { | |
4459 | ipt.error = 0; | |
18bceab1 JA |
4460 | /* only remove double add if we did it here */ |
4461 | if (!had_io) | |
4462 | io_poll_remove_double(req); | |
d7718a9d JA |
4463 | spin_unlock_irq(&ctx->completion_lock); |
4464 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4465 | kfree(apoll); | |
4466 | return false; | |
4467 | } | |
4468 | spin_unlock_irq(&ctx->completion_lock); | |
4469 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4470 | apoll->poll.events); | |
4471 | return true; | |
4472 | } | |
4473 | ||
4474 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4475 | struct io_poll_iocb *poll) | |
221c5eb2 | 4476 | { |
b41e9852 | 4477 | bool do_complete = false; |
221c5eb2 JA |
4478 | |
4479 | spin_lock(&poll->head->lock); | |
4480 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4481 | if (!list_empty(&poll->wait.entry)) { |
4482 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4483 | do_complete = true; |
221c5eb2 JA |
4484 | } |
4485 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4486 | hash_del(&req->hash_node); |
d7718a9d JA |
4487 | return do_complete; |
4488 | } | |
4489 | ||
4490 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4491 | { | |
4492 | bool do_complete; | |
4493 | ||
4494 | if (req->opcode == IORING_OP_POLL_ADD) { | |
18bceab1 | 4495 | io_poll_remove_double(req); |
d7718a9d JA |
4496 | do_complete = __io_poll_remove_one(req, &req->poll); |
4497 | } else { | |
3bfa5bcb JA |
4498 | struct async_poll *apoll = req->apoll; |
4499 | ||
d7718a9d | 4500 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4501 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4502 | if (do_complete) { | |
d7718a9d | 4503 | io_put_req(req); |
3bfa5bcb JA |
4504 | /* |
4505 | * restore ->work because we will call | |
4506 | * io_req_work_drop_env below when dropping the | |
4507 | * final reference. | |
4508 | */ | |
4509 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4510 | kfree(apoll); | |
4511 | } | |
b1f573bd XW |
4512 | } |
4513 | ||
b41e9852 JA |
4514 | if (do_complete) { |
4515 | io_cqring_fill_event(req, -ECANCELED); | |
4516 | io_commit_cqring(req->ctx); | |
4517 | req->flags |= REQ_F_COMP_LOCKED; | |
4518 | io_put_req(req); | |
4519 | } | |
4520 | ||
4521 | return do_complete; | |
221c5eb2 JA |
4522 | } |
4523 | ||
4524 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4525 | { | |
78076bb6 | 4526 | struct hlist_node *tmp; |
221c5eb2 | 4527 | struct io_kiocb *req; |
8e2e1faf | 4528 | int posted = 0, i; |
221c5eb2 JA |
4529 | |
4530 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4531 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4532 | struct hlist_head *list; | |
4533 | ||
4534 | list = &ctx->cancel_hash[i]; | |
4535 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4536 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4537 | } |
4538 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4539 | |
8e2e1faf JA |
4540 | if (posted) |
4541 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4542 | } |
4543 | ||
47f46768 JA |
4544 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4545 | { | |
78076bb6 | 4546 | struct hlist_head *list; |
47f46768 JA |
4547 | struct io_kiocb *req; |
4548 | ||
78076bb6 JA |
4549 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4550 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4551 | if (sqe_addr != req->user_data) |
4552 | continue; | |
4553 | if (io_poll_remove_one(req)) | |
eac406c6 | 4554 | return 0; |
b41e9852 | 4555 | return -EALREADY; |
47f46768 JA |
4556 | } |
4557 | ||
4558 | return -ENOENT; | |
4559 | } | |
4560 | ||
3529d8c2 JA |
4561 | static int io_poll_remove_prep(struct io_kiocb *req, |
4562 | const struct io_uring_sqe *sqe) | |
0969e783 | 4563 | { |
0969e783 JA |
4564 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4565 | return -EINVAL; | |
4566 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4567 | sqe->poll_events) | |
4568 | return -EINVAL; | |
4569 | ||
4570 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4571 | return 0; |
4572 | } | |
4573 | ||
221c5eb2 JA |
4574 | /* |
4575 | * Find a running poll command that matches one specified in sqe->addr, | |
4576 | * and remove it if found. | |
4577 | */ | |
fc4df999 | 4578 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4579 | { |
4580 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4581 | u64 addr; |
47f46768 | 4582 | int ret; |
221c5eb2 | 4583 | |
0969e783 | 4584 | addr = req->poll.addr; |
221c5eb2 | 4585 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4586 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4587 | spin_unlock_irq(&ctx->completion_lock); |
4588 | ||
78e19bbe | 4589 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
4590 | if (ret < 0) |
4591 | req_set_fail_links(req); | |
e65ef56d | 4592 | io_put_req(req); |
221c5eb2 JA |
4593 | return 0; |
4594 | } | |
4595 | ||
221c5eb2 JA |
4596 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4597 | void *key) | |
4598 | { | |
c2f2eb7d JA |
4599 | struct io_kiocb *req = wait->private; |
4600 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4601 | |
d7718a9d | 4602 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4603 | } |
4604 | ||
221c5eb2 JA |
4605 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4606 | struct poll_table_struct *p) | |
4607 | { | |
4608 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4609 | ||
d7718a9d | 4610 | __io_queue_proc(&pt->req->poll, pt, head); |
eac406c6 JA |
4611 | } |
4612 | ||
3529d8c2 | 4613 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4614 | { |
4615 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4616 | u16 events; |
221c5eb2 JA |
4617 | |
4618 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4619 | return -EINVAL; | |
4620 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4621 | return -EINVAL; | |
09bb8394 JA |
4622 | if (!poll->file) |
4623 | return -EBADF; | |
221c5eb2 | 4624 | |
221c5eb2 JA |
4625 | events = READ_ONCE(sqe->poll_events); |
4626 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP; | |
b41e9852 | 4627 | |
3537b6a7 | 4628 | get_task_struct(current); |
b41e9852 | 4629 | req->task = current; |
0969e783 JA |
4630 | return 0; |
4631 | } | |
4632 | ||
014db007 | 4633 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4634 | { |
4635 | struct io_poll_iocb *poll = &req->poll; | |
4636 | struct io_ring_ctx *ctx = req->ctx; | |
4637 | struct io_poll_table ipt; | |
0969e783 | 4638 | __poll_t mask; |
0969e783 | 4639 | |
78076bb6 | 4640 | INIT_HLIST_NODE(&req->hash_node); |
36703247 | 4641 | INIT_LIST_HEAD(&req->list); |
d7718a9d | 4642 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4643 | |
d7718a9d JA |
4644 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4645 | io_poll_wake); | |
221c5eb2 | 4646 | |
8c838788 | 4647 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4648 | ipt.error = 0; |
b0dd8a41 | 4649 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4650 | } |
221c5eb2 JA |
4651 | spin_unlock_irq(&ctx->completion_lock); |
4652 | ||
8c838788 JA |
4653 | if (mask) { |
4654 | io_cqring_ev_posted(ctx); | |
014db007 | 4655 | io_put_req(req); |
221c5eb2 | 4656 | } |
8c838788 | 4657 | return ipt.error; |
221c5eb2 JA |
4658 | } |
4659 | ||
5262f567 JA |
4660 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4661 | { | |
ad8a48ac JA |
4662 | struct io_timeout_data *data = container_of(timer, |
4663 | struct io_timeout_data, timer); | |
4664 | struct io_kiocb *req = data->req; | |
4665 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4666 | unsigned long flags; |
4667 | ||
5262f567 JA |
4668 | atomic_inc(&ctx->cq_timeouts); |
4669 | ||
4670 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4671 | /* |
11365043 JA |
4672 | * We could be racing with timeout deletion. If the list is empty, |
4673 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4674 | */ |
bfe68a22 | 4675 | if (!list_empty(&req->list)) |
11365043 | 4676 | list_del_init(&req->list); |
5262f567 | 4677 | |
78e19bbe | 4678 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4679 | io_commit_cqring(ctx); |
4680 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4681 | ||
4682 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4683 | req_set_fail_links(req); |
5262f567 JA |
4684 | io_put_req(req); |
4685 | return HRTIMER_NORESTART; | |
4686 | } | |
4687 | ||
47f46768 JA |
4688 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
4689 | { | |
4690 | struct io_kiocb *req; | |
4691 | int ret = -ENOENT; | |
4692 | ||
4693 | list_for_each_entry(req, &ctx->timeout_list, list) { | |
4694 | if (user_data == req->user_data) { | |
4695 | list_del_init(&req->list); | |
4696 | ret = 0; | |
4697 | break; | |
4698 | } | |
4699 | } | |
4700 | ||
4701 | if (ret == -ENOENT) | |
4702 | return ret; | |
4703 | ||
2d28390a | 4704 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
4705 | if (ret == -1) |
4706 | return -EALREADY; | |
4707 | ||
4e88d6e7 | 4708 | req_set_fail_links(req); |
47f46768 JA |
4709 | io_cqring_fill_event(req, -ECANCELED); |
4710 | io_put_req(req); | |
4711 | return 0; | |
4712 | } | |
4713 | ||
3529d8c2 JA |
4714 | static int io_timeout_remove_prep(struct io_kiocb *req, |
4715 | const struct io_uring_sqe *sqe) | |
b29472ee | 4716 | { |
b29472ee JA |
4717 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4718 | return -EINVAL; | |
4719 | if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len) | |
4720 | return -EINVAL; | |
4721 | ||
4722 | req->timeout.addr = READ_ONCE(sqe->addr); | |
4723 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
4724 | if (req->timeout.flags) | |
4725 | return -EINVAL; | |
4726 | ||
b29472ee JA |
4727 | return 0; |
4728 | } | |
4729 | ||
11365043 JA |
4730 | /* |
4731 | * Remove or update an existing timeout command | |
4732 | */ | |
fc4df999 | 4733 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
4734 | { |
4735 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 4736 | int ret; |
11365043 | 4737 | |
11365043 | 4738 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 4739 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 4740 | |
47f46768 | 4741 | io_cqring_fill_event(req, ret); |
11365043 JA |
4742 | io_commit_cqring(ctx); |
4743 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 4744 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
4745 | if (ret < 0) |
4746 | req_set_fail_links(req); | |
ec9c02ad | 4747 | io_put_req(req); |
11365043 | 4748 | return 0; |
5262f567 JA |
4749 | } |
4750 | ||
3529d8c2 | 4751 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 4752 | bool is_timeout_link) |
5262f567 | 4753 | { |
ad8a48ac | 4754 | struct io_timeout_data *data; |
a41525ab | 4755 | unsigned flags; |
56080b02 | 4756 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 4757 | |
ad8a48ac | 4758 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 4759 | return -EINVAL; |
ad8a48ac | 4760 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 4761 | return -EINVAL; |
56080b02 | 4762 | if (off && is_timeout_link) |
2d28390a | 4763 | return -EINVAL; |
a41525ab JA |
4764 | flags = READ_ONCE(sqe->timeout_flags); |
4765 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 4766 | return -EINVAL; |
bdf20073 | 4767 | |
bfe68a22 | 4768 | req->timeout.off = off; |
26a61679 | 4769 | |
3529d8c2 | 4770 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
4771 | return -ENOMEM; |
4772 | ||
4773 | data = &req->io->timeout; | |
ad8a48ac | 4774 | data->req = req; |
ad8a48ac JA |
4775 | req->flags |= REQ_F_TIMEOUT; |
4776 | ||
4777 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
4778 | return -EFAULT; |
4779 | ||
11365043 | 4780 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 4781 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 4782 | else |
ad8a48ac | 4783 | data->mode = HRTIMER_MODE_REL; |
11365043 | 4784 | |
ad8a48ac JA |
4785 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
4786 | return 0; | |
4787 | } | |
4788 | ||
fc4df999 | 4789 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 4790 | { |
ad8a48ac | 4791 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 4792 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 4793 | struct list_head *entry; |
bfe68a22 | 4794 | u32 tail, off = req->timeout.off; |
ad8a48ac | 4795 | |
733f5c95 | 4796 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 4797 | |
5262f567 JA |
4798 | /* |
4799 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
4800 | * timeout event to be satisfied. If it isn't set, then this is |
4801 | * a pure timeout request, sequence isn't used. | |
5262f567 | 4802 | */ |
bfe68a22 | 4803 | if (!off) { |
93bd25bb | 4804 | req->flags |= REQ_F_TIMEOUT_NOSEQ; |
93bd25bb JA |
4805 | entry = ctx->timeout_list.prev; |
4806 | goto add; | |
4807 | } | |
5262f567 | 4808 | |
bfe68a22 PB |
4809 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
4810 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
4811 | |
4812 | /* | |
4813 | * Insertion sort, ensuring the first entry in the list is always | |
4814 | * the one we need first. | |
4815 | */ | |
5262f567 JA |
4816 | list_for_each_prev(entry, &ctx->timeout_list) { |
4817 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); | |
5262f567 | 4818 | |
93bd25bb JA |
4819 | if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) |
4820 | continue; | |
bfe68a22 PB |
4821 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
4822 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
4823 | break; |
4824 | } | |
93bd25bb | 4825 | add: |
5262f567 | 4826 | list_add(&req->list, entry); |
ad8a48ac JA |
4827 | data->timer.function = io_timeout_fn; |
4828 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 4829 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
4830 | return 0; |
4831 | } | |
5262f567 | 4832 | |
62755e35 JA |
4833 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
4834 | { | |
4835 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
4836 | ||
4837 | return req->user_data == (unsigned long) data; | |
4838 | } | |
4839 | ||
e977d6d3 | 4840 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 4841 | { |
62755e35 | 4842 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
4843 | int ret = 0; |
4844 | ||
62755e35 JA |
4845 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr); |
4846 | switch (cancel_ret) { | |
4847 | case IO_WQ_CANCEL_OK: | |
4848 | ret = 0; | |
4849 | break; | |
4850 | case IO_WQ_CANCEL_RUNNING: | |
4851 | ret = -EALREADY; | |
4852 | break; | |
4853 | case IO_WQ_CANCEL_NOTFOUND: | |
4854 | ret = -ENOENT; | |
4855 | break; | |
4856 | } | |
4857 | ||
e977d6d3 JA |
4858 | return ret; |
4859 | } | |
4860 | ||
47f46768 JA |
4861 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
4862 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 4863 | int success_ret) |
47f46768 JA |
4864 | { |
4865 | unsigned long flags; | |
4866 | int ret; | |
4867 | ||
4868 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
4869 | if (ret != -ENOENT) { | |
4870 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4871 | goto done; | |
4872 | } | |
4873 | ||
4874 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4875 | ret = io_timeout_cancel(ctx, sqe_addr); | |
4876 | if (ret != -ENOENT) | |
4877 | goto done; | |
4878 | ret = io_poll_cancel(ctx, sqe_addr); | |
4879 | done: | |
b0dd8a41 JA |
4880 | if (!ret) |
4881 | ret = success_ret; | |
47f46768 JA |
4882 | io_cqring_fill_event(req, ret); |
4883 | io_commit_cqring(ctx); | |
4884 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4885 | io_cqring_ev_posted(ctx); | |
4886 | ||
4e88d6e7 JA |
4887 | if (ret < 0) |
4888 | req_set_fail_links(req); | |
014db007 | 4889 | io_put_req(req); |
47f46768 JA |
4890 | } |
4891 | ||
3529d8c2 JA |
4892 | static int io_async_cancel_prep(struct io_kiocb *req, |
4893 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 4894 | { |
fbf23849 | 4895 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 JA |
4896 | return -EINVAL; |
4897 | if (sqe->flags || sqe->ioprio || sqe->off || sqe->len || | |
4898 | sqe->cancel_flags) | |
4899 | return -EINVAL; | |
4900 | ||
fbf23849 JA |
4901 | req->cancel.addr = READ_ONCE(sqe->addr); |
4902 | return 0; | |
4903 | } | |
4904 | ||
014db007 | 4905 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
4906 | { |
4907 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 4908 | |
014db007 | 4909 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
4910 | return 0; |
4911 | } | |
4912 | ||
05f3fb3c JA |
4913 | static int io_files_update_prep(struct io_kiocb *req, |
4914 | const struct io_uring_sqe *sqe) | |
4915 | { | |
4916 | if (sqe->flags || sqe->ioprio || sqe->rw_flags) | |
4917 | return -EINVAL; | |
4918 | ||
4919 | req->files_update.offset = READ_ONCE(sqe->off); | |
4920 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
4921 | if (!req->files_update.nr_args) | |
4922 | return -EINVAL; | |
4923 | req->files_update.arg = READ_ONCE(sqe->addr); | |
4924 | return 0; | |
4925 | } | |
4926 | ||
4927 | static int io_files_update(struct io_kiocb *req, bool force_nonblock) | |
fbf23849 JA |
4928 | { |
4929 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
4930 | struct io_uring_files_update up; |
4931 | int ret; | |
fbf23849 | 4932 | |
f86cd20c | 4933 | if (force_nonblock) |
05f3fb3c | 4934 | return -EAGAIN; |
05f3fb3c JA |
4935 | |
4936 | up.offset = req->files_update.offset; | |
4937 | up.fds = req->files_update.arg; | |
4938 | ||
4939 | mutex_lock(&ctx->uring_lock); | |
4940 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
4941 | mutex_unlock(&ctx->uring_lock); | |
4942 | ||
4943 | if (ret < 0) | |
4944 | req_set_fail_links(req); | |
4945 | io_cqring_add_event(req, ret); | |
4946 | io_put_req(req); | |
5262f567 JA |
4947 | return 0; |
4948 | } | |
4949 | ||
3529d8c2 JA |
4950 | static int io_req_defer_prep(struct io_kiocb *req, |
4951 | const struct io_uring_sqe *sqe) | |
f67676d1 | 4952 | { |
e781573e | 4953 | ssize_t ret = 0; |
f67676d1 | 4954 | |
f1d96a8f PB |
4955 | if (!sqe) |
4956 | return 0; | |
4957 | ||
f86cd20c JA |
4958 | if (io_op_defs[req->opcode].file_table) { |
4959 | ret = io_grab_files(req); | |
4960 | if (unlikely(ret)) | |
4961 | return ret; | |
4962 | } | |
4963 | ||
cccf0ee8 JA |
4964 | io_req_work_grab_env(req, &io_op_defs[req->opcode]); |
4965 | ||
d625c6ee | 4966 | switch (req->opcode) { |
e781573e JA |
4967 | case IORING_OP_NOP: |
4968 | break; | |
f67676d1 JA |
4969 | case IORING_OP_READV: |
4970 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 4971 | case IORING_OP_READ: |
3529d8c2 | 4972 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
4973 | break; |
4974 | case IORING_OP_WRITEV: | |
4975 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 4976 | case IORING_OP_WRITE: |
3529d8c2 | 4977 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 4978 | break; |
0969e783 | 4979 | case IORING_OP_POLL_ADD: |
3529d8c2 | 4980 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
4981 | break; |
4982 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 4983 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 4984 | break; |
8ed8d3c3 | 4985 | case IORING_OP_FSYNC: |
3529d8c2 | 4986 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
4987 | break; |
4988 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 4989 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 4990 | break; |
03b1230c | 4991 | case IORING_OP_SENDMSG: |
fddaface | 4992 | case IORING_OP_SEND: |
3529d8c2 | 4993 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
4994 | break; |
4995 | case IORING_OP_RECVMSG: | |
fddaface | 4996 | case IORING_OP_RECV: |
3529d8c2 | 4997 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 4998 | break; |
f499a021 | 4999 | case IORING_OP_CONNECT: |
3529d8c2 | 5000 | ret = io_connect_prep(req, sqe); |
f499a021 | 5001 | break; |
2d28390a | 5002 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5003 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5004 | break; |
b29472ee | 5005 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5006 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5007 | break; |
fbf23849 | 5008 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5009 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5010 | break; |
2d28390a | 5011 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5012 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5013 | break; |
8ed8d3c3 | 5014 | case IORING_OP_ACCEPT: |
3529d8c2 | 5015 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5016 | break; |
d63d1b5e JA |
5017 | case IORING_OP_FALLOCATE: |
5018 | ret = io_fallocate_prep(req, sqe); | |
5019 | break; | |
15b71abe JA |
5020 | case IORING_OP_OPENAT: |
5021 | ret = io_openat_prep(req, sqe); | |
5022 | break; | |
b5dba59e JA |
5023 | case IORING_OP_CLOSE: |
5024 | ret = io_close_prep(req, sqe); | |
5025 | break; | |
05f3fb3c JA |
5026 | case IORING_OP_FILES_UPDATE: |
5027 | ret = io_files_update_prep(req, sqe); | |
5028 | break; | |
eddc7ef5 JA |
5029 | case IORING_OP_STATX: |
5030 | ret = io_statx_prep(req, sqe); | |
5031 | break; | |
4840e418 JA |
5032 | case IORING_OP_FADVISE: |
5033 | ret = io_fadvise_prep(req, sqe); | |
5034 | break; | |
c1ca757b JA |
5035 | case IORING_OP_MADVISE: |
5036 | ret = io_madvise_prep(req, sqe); | |
5037 | break; | |
cebdb986 JA |
5038 | case IORING_OP_OPENAT2: |
5039 | ret = io_openat2_prep(req, sqe); | |
5040 | break; | |
3e4827b0 JA |
5041 | case IORING_OP_EPOLL_CTL: |
5042 | ret = io_epoll_ctl_prep(req, sqe); | |
5043 | break; | |
7d67af2c PB |
5044 | case IORING_OP_SPLICE: |
5045 | ret = io_splice_prep(req, sqe); | |
5046 | break; | |
ddf0322d JA |
5047 | case IORING_OP_PROVIDE_BUFFERS: |
5048 | ret = io_provide_buffers_prep(req, sqe); | |
5049 | break; | |
067524e9 JA |
5050 | case IORING_OP_REMOVE_BUFFERS: |
5051 | ret = io_remove_buffers_prep(req, sqe); | |
5052 | break; | |
f2a8d5c7 PB |
5053 | case IORING_OP_TEE: |
5054 | ret = io_tee_prep(req, sqe); | |
5055 | break; | |
f67676d1 | 5056 | default: |
e781573e JA |
5057 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5058 | req->opcode); | |
5059 | ret = -EINVAL; | |
b7bb4f7d | 5060 | break; |
f67676d1 JA |
5061 | } |
5062 | ||
b7bb4f7d | 5063 | return ret; |
f67676d1 JA |
5064 | } |
5065 | ||
3529d8c2 | 5066 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5067 | { |
a197f664 | 5068 | struct io_ring_ctx *ctx = req->ctx; |
f67676d1 | 5069 | int ret; |
de0617e4 | 5070 | |
9d858b21 | 5071 | /* Still need defer if there is pending req in defer list. */ |
4ee36314 | 5072 | if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list)) |
de0617e4 JA |
5073 | return 0; |
5074 | ||
650b5481 PB |
5075 | if (!req->io) { |
5076 | if (io_alloc_async_ctx(req)) | |
5077 | return -EAGAIN; | |
5078 | ret = io_req_defer_prep(req, sqe); | |
5079 | if (ret < 0) | |
5080 | return ret; | |
5081 | } | |
2d28390a | 5082 | |
de0617e4 | 5083 | spin_lock_irq(&ctx->completion_lock); |
9d858b21 | 5084 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5085 | spin_unlock_irq(&ctx->completion_lock); |
de0617e4 JA |
5086 | return 0; |
5087 | } | |
5088 | ||
915967f6 | 5089 | trace_io_uring_defer(ctx, req, req->user_data); |
de0617e4 JA |
5090 | list_add_tail(&req->list, &ctx->defer_list); |
5091 | spin_unlock_irq(&ctx->completion_lock); | |
5092 | return -EIOCBQUEUED; | |
5093 | } | |
5094 | ||
99bc4c38 PB |
5095 | static void io_cleanup_req(struct io_kiocb *req) |
5096 | { | |
5097 | struct io_async_ctx *io = req->io; | |
5098 | ||
5099 | switch (req->opcode) { | |
5100 | case IORING_OP_READV: | |
5101 | case IORING_OP_READ_FIXED: | |
5102 | case IORING_OP_READ: | |
bcda7baa JA |
5103 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5104 | kfree((void *)(unsigned long)req->rw.addr); | |
5105 | /* fallthrough */ | |
99bc4c38 PB |
5106 | case IORING_OP_WRITEV: |
5107 | case IORING_OP_WRITE_FIXED: | |
5108 | case IORING_OP_WRITE: | |
5109 | if (io->rw.iov != io->rw.fast_iov) | |
5110 | kfree(io->rw.iov); | |
5111 | break; | |
99bc4c38 | 5112 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5113 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5114 | kfree(req->sr_msg.kbuf); | |
5115 | /* fallthrough */ | |
5116 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5117 | if (io->msg.iov != io->msg.fast_iov) |
5118 | kfree(io->msg.iov); | |
5119 | break; | |
bcda7baa JA |
5120 | case IORING_OP_RECV: |
5121 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5122 | kfree(req->sr_msg.kbuf); | |
5123 | break; | |
8fef80bf PB |
5124 | case IORING_OP_OPENAT: |
5125 | case IORING_OP_OPENAT2: | |
8fef80bf | 5126 | break; |
7d67af2c | 5127 | case IORING_OP_SPLICE: |
f2a8d5c7 | 5128 | case IORING_OP_TEE: |
7d67af2c PB |
5129 | io_put_file(req, req->splice.file_in, |
5130 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5131 | break; | |
99bc4c38 PB |
5132 | } |
5133 | ||
5134 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5135 | } | |
5136 | ||
3529d8c2 | 5137 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
014db007 | 5138 | bool force_nonblock) |
2b188cc1 | 5139 | { |
a197f664 | 5140 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5141 | int ret; |
2b188cc1 | 5142 | |
d625c6ee | 5143 | switch (req->opcode) { |
2b188cc1 | 5144 | case IORING_OP_NOP: |
78e19bbe | 5145 | ret = io_nop(req); |
2b188cc1 JA |
5146 | break; |
5147 | case IORING_OP_READV: | |
edafccee | 5148 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5149 | case IORING_OP_READ: |
3529d8c2 JA |
5150 | if (sqe) { |
5151 | ret = io_read_prep(req, sqe, force_nonblock); | |
5152 | if (ret < 0) | |
5153 | break; | |
5154 | } | |
014db007 | 5155 | ret = io_read(req, force_nonblock); |
edafccee | 5156 | break; |
3529d8c2 | 5157 | case IORING_OP_WRITEV: |
edafccee | 5158 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5159 | case IORING_OP_WRITE: |
3529d8c2 JA |
5160 | if (sqe) { |
5161 | ret = io_write_prep(req, sqe, force_nonblock); | |
5162 | if (ret < 0) | |
5163 | break; | |
5164 | } | |
014db007 | 5165 | ret = io_write(req, force_nonblock); |
2b188cc1 | 5166 | break; |
c992fe29 | 5167 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5168 | if (sqe) { |
5169 | ret = io_prep_fsync(req, sqe); | |
5170 | if (ret < 0) | |
5171 | break; | |
5172 | } | |
014db007 | 5173 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5174 | break; |
221c5eb2 | 5175 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5176 | if (sqe) { |
5177 | ret = io_poll_add_prep(req, sqe); | |
5178 | if (ret) | |
5179 | break; | |
5180 | } | |
014db007 | 5181 | ret = io_poll_add(req); |
221c5eb2 JA |
5182 | break; |
5183 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5184 | if (sqe) { |
5185 | ret = io_poll_remove_prep(req, sqe); | |
5186 | if (ret < 0) | |
5187 | break; | |
5188 | } | |
fc4df999 | 5189 | ret = io_poll_remove(req); |
221c5eb2 | 5190 | break; |
5d17b4a4 | 5191 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5192 | if (sqe) { |
5193 | ret = io_prep_sfr(req, sqe); | |
5194 | if (ret < 0) | |
5195 | break; | |
5196 | } | |
014db007 | 5197 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5198 | break; |
0fa03c62 | 5199 | case IORING_OP_SENDMSG: |
fddaface | 5200 | case IORING_OP_SEND: |
3529d8c2 JA |
5201 | if (sqe) { |
5202 | ret = io_sendmsg_prep(req, sqe); | |
5203 | if (ret < 0) | |
5204 | break; | |
5205 | } | |
fddaface | 5206 | if (req->opcode == IORING_OP_SENDMSG) |
014db007 | 5207 | ret = io_sendmsg(req, force_nonblock); |
fddaface | 5208 | else |
014db007 | 5209 | ret = io_send(req, force_nonblock); |
0fa03c62 | 5210 | break; |
aa1fa28f | 5211 | case IORING_OP_RECVMSG: |
fddaface | 5212 | case IORING_OP_RECV: |
3529d8c2 JA |
5213 | if (sqe) { |
5214 | ret = io_recvmsg_prep(req, sqe); | |
5215 | if (ret) | |
5216 | break; | |
5217 | } | |
fddaface | 5218 | if (req->opcode == IORING_OP_RECVMSG) |
014db007 | 5219 | ret = io_recvmsg(req, force_nonblock); |
fddaface | 5220 | else |
014db007 | 5221 | ret = io_recv(req, force_nonblock); |
aa1fa28f | 5222 | break; |
5262f567 | 5223 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5224 | if (sqe) { |
5225 | ret = io_timeout_prep(req, sqe, false); | |
5226 | if (ret) | |
5227 | break; | |
5228 | } | |
fc4df999 | 5229 | ret = io_timeout(req); |
5262f567 | 5230 | break; |
11365043 | 5231 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5232 | if (sqe) { |
5233 | ret = io_timeout_remove_prep(req, sqe); | |
5234 | if (ret) | |
5235 | break; | |
5236 | } | |
fc4df999 | 5237 | ret = io_timeout_remove(req); |
11365043 | 5238 | break; |
17f2fe35 | 5239 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5240 | if (sqe) { |
5241 | ret = io_accept_prep(req, sqe); | |
5242 | if (ret) | |
5243 | break; | |
5244 | } | |
014db007 | 5245 | ret = io_accept(req, force_nonblock); |
17f2fe35 | 5246 | break; |
f8e85cf2 | 5247 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5248 | if (sqe) { |
5249 | ret = io_connect_prep(req, sqe); | |
5250 | if (ret) | |
5251 | break; | |
5252 | } | |
014db007 | 5253 | ret = io_connect(req, force_nonblock); |
f8e85cf2 | 5254 | break; |
62755e35 | 5255 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5256 | if (sqe) { |
5257 | ret = io_async_cancel_prep(req, sqe); | |
5258 | if (ret) | |
5259 | break; | |
5260 | } | |
014db007 | 5261 | ret = io_async_cancel(req); |
62755e35 | 5262 | break; |
d63d1b5e JA |
5263 | case IORING_OP_FALLOCATE: |
5264 | if (sqe) { | |
5265 | ret = io_fallocate_prep(req, sqe); | |
5266 | if (ret) | |
5267 | break; | |
5268 | } | |
014db007 | 5269 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5270 | break; |
15b71abe JA |
5271 | case IORING_OP_OPENAT: |
5272 | if (sqe) { | |
5273 | ret = io_openat_prep(req, sqe); | |
5274 | if (ret) | |
5275 | break; | |
5276 | } | |
014db007 | 5277 | ret = io_openat(req, force_nonblock); |
15b71abe | 5278 | break; |
b5dba59e JA |
5279 | case IORING_OP_CLOSE: |
5280 | if (sqe) { | |
5281 | ret = io_close_prep(req, sqe); | |
5282 | if (ret) | |
5283 | break; | |
5284 | } | |
014db007 | 5285 | ret = io_close(req, force_nonblock); |
b5dba59e | 5286 | break; |
05f3fb3c JA |
5287 | case IORING_OP_FILES_UPDATE: |
5288 | if (sqe) { | |
5289 | ret = io_files_update_prep(req, sqe); | |
5290 | if (ret) | |
5291 | break; | |
5292 | } | |
5293 | ret = io_files_update(req, force_nonblock); | |
5294 | break; | |
eddc7ef5 JA |
5295 | case IORING_OP_STATX: |
5296 | if (sqe) { | |
5297 | ret = io_statx_prep(req, sqe); | |
5298 | if (ret) | |
5299 | break; | |
5300 | } | |
014db007 | 5301 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5302 | break; |
4840e418 JA |
5303 | case IORING_OP_FADVISE: |
5304 | if (sqe) { | |
5305 | ret = io_fadvise_prep(req, sqe); | |
5306 | if (ret) | |
5307 | break; | |
5308 | } | |
014db007 | 5309 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5310 | break; |
c1ca757b JA |
5311 | case IORING_OP_MADVISE: |
5312 | if (sqe) { | |
5313 | ret = io_madvise_prep(req, sqe); | |
5314 | if (ret) | |
5315 | break; | |
5316 | } | |
014db007 | 5317 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5318 | break; |
cebdb986 JA |
5319 | case IORING_OP_OPENAT2: |
5320 | if (sqe) { | |
5321 | ret = io_openat2_prep(req, sqe); | |
5322 | if (ret) | |
5323 | break; | |
5324 | } | |
014db007 | 5325 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5326 | break; |
3e4827b0 JA |
5327 | case IORING_OP_EPOLL_CTL: |
5328 | if (sqe) { | |
5329 | ret = io_epoll_ctl_prep(req, sqe); | |
5330 | if (ret) | |
5331 | break; | |
5332 | } | |
014db007 | 5333 | ret = io_epoll_ctl(req, force_nonblock); |
3e4827b0 | 5334 | break; |
7d67af2c PB |
5335 | case IORING_OP_SPLICE: |
5336 | if (sqe) { | |
5337 | ret = io_splice_prep(req, sqe); | |
5338 | if (ret < 0) | |
5339 | break; | |
5340 | } | |
014db007 | 5341 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5342 | break; |
ddf0322d JA |
5343 | case IORING_OP_PROVIDE_BUFFERS: |
5344 | if (sqe) { | |
5345 | ret = io_provide_buffers_prep(req, sqe); | |
5346 | if (ret) | |
5347 | break; | |
5348 | } | |
5349 | ret = io_provide_buffers(req, force_nonblock); | |
5350 | break; | |
067524e9 JA |
5351 | case IORING_OP_REMOVE_BUFFERS: |
5352 | if (sqe) { | |
5353 | ret = io_remove_buffers_prep(req, sqe); | |
5354 | if (ret) | |
5355 | break; | |
5356 | } | |
5357 | ret = io_remove_buffers(req, force_nonblock); | |
3e4827b0 | 5358 | break; |
f2a8d5c7 PB |
5359 | case IORING_OP_TEE: |
5360 | if (sqe) { | |
5361 | ret = io_tee_prep(req, sqe); | |
5362 | if (ret < 0) | |
5363 | break; | |
5364 | } | |
5365 | ret = io_tee(req, force_nonblock); | |
5366 | break; | |
2b188cc1 JA |
5367 | default: |
5368 | ret = -EINVAL; | |
5369 | break; | |
5370 | } | |
5371 | ||
def596e9 JA |
5372 | if (ret) |
5373 | return ret; | |
5374 | ||
b532576e JA |
5375 | /* If the op doesn't have a file, we're not polling for it */ |
5376 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5377 | const bool in_async = io_wq_current_is_worker(); |
5378 | ||
9e645e11 | 5379 | if (req->result == -EAGAIN) |
def596e9 JA |
5380 | return -EAGAIN; |
5381 | ||
11ba820b JA |
5382 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5383 | if (in_async) | |
5384 | mutex_lock(&ctx->uring_lock); | |
5385 | ||
def596e9 | 5386 | io_iopoll_req_issued(req); |
11ba820b JA |
5387 | |
5388 | if (in_async) | |
5389 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5390 | } |
5391 | ||
5392 | return 0; | |
2b188cc1 JA |
5393 | } |
5394 | ||
561fb04a | 5395 | static void io_wq_submit_work(struct io_wq_work **workptr) |
2b188cc1 | 5396 | { |
561fb04a | 5397 | struct io_wq_work *work = *workptr; |
2b188cc1 | 5398 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
561fb04a | 5399 | int ret = 0; |
2b188cc1 | 5400 | |
0c9d5ccd JA |
5401 | /* if NO_CANCEL is set, we must still run the work */ |
5402 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5403 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5404 | ret = -ECANCELED; |
0c9d5ccd | 5405 | } |
31b51510 | 5406 | |
561fb04a | 5407 | if (!ret) { |
561fb04a | 5408 | do { |
014db007 | 5409 | ret = io_issue_sqe(req, NULL, false); |
561fb04a JA |
5410 | /* |
5411 | * We can get EAGAIN for polled IO even though we're | |
5412 | * forcing a sync submission from here, since we can't | |
5413 | * wait for request slots on the block side. | |
5414 | */ | |
5415 | if (ret != -EAGAIN) | |
5416 | break; | |
5417 | cond_resched(); | |
5418 | } while (1); | |
5419 | } | |
31b51510 | 5420 | |
561fb04a | 5421 | if (ret) { |
4e88d6e7 | 5422 | req_set_fail_links(req); |
78e19bbe | 5423 | io_cqring_add_event(req, ret); |
817869d2 | 5424 | io_put_req(req); |
edafccee | 5425 | } |
2b188cc1 | 5426 | |
e9fd9396 | 5427 | io_steal_work(req, workptr); |
2b188cc1 JA |
5428 | } |
5429 | ||
65e19f54 JA |
5430 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5431 | int index) | |
5432 | { | |
5433 | struct fixed_file_table *table; | |
5434 | ||
05f3fb3c | 5435 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5436 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5437 | } |
5438 | ||
8da11c19 PB |
5439 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5440 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5441 | { |
a197f664 | 5442 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5443 | struct file *file; |
09bb8394 | 5444 | |
8da11c19 | 5445 | if (fixed) { |
05f3fb3c | 5446 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5447 | (unsigned) fd >= ctx->nr_user_files)) |
5448 | return -EBADF; | |
b7620121 | 5449 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5450 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5451 | if (file) { |
5452 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5453 | percpu_ref_get(req->fixed_file_refs); | |
5454 | } | |
09bb8394 | 5455 | } else { |
c826bd7a | 5456 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5457 | file = __io_file_get(state, fd); |
09bb8394 JA |
5458 | } |
5459 | ||
fd2206e4 JA |
5460 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5461 | *out_file = file; | |
5462 | return 0; | |
5463 | } | |
5464 | return -EBADF; | |
09bb8394 JA |
5465 | } |
5466 | ||
8da11c19 | 5467 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5468 | int fd) |
8da11c19 | 5469 | { |
8da11c19 PB |
5470 | bool fixed; |
5471 | ||
63ff8223 | 5472 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5473 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5474 | return -EBADF; |
5475 | ||
5476 | return io_file_get(state, req, fd, &req->file, fixed); | |
5477 | } | |
5478 | ||
a197f664 | 5479 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5480 | { |
5481 | int ret = -EBADF; | |
a197f664 | 5482 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5483 | |
5b0bbee4 | 5484 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5485 | return 0; |
b14cca0c | 5486 | if (!ctx->ring_file) |
b5dba59e JA |
5487 | return -EBADF; |
5488 | ||
fcb323cc JA |
5489 | rcu_read_lock(); |
5490 | spin_lock_irq(&ctx->inflight_lock); | |
5491 | /* | |
5492 | * We use the f_ops->flush() handler to ensure that we can flush | |
5493 | * out work accessing these files if the fd is closed. Check if | |
5494 | * the fd has changed since we started down this path, and disallow | |
5495 | * this operation if it has. | |
5496 | */ | |
b14cca0c | 5497 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5498 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5499 | req->flags |= REQ_F_INFLIGHT; | |
5500 | req->work.files = current->files; | |
5501 | ret = 0; | |
5502 | } | |
5503 | spin_unlock_irq(&ctx->inflight_lock); | |
5504 | rcu_read_unlock(); | |
5505 | ||
5506 | return ret; | |
5507 | } | |
5508 | ||
2665abfd | 5509 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5510 | { |
ad8a48ac JA |
5511 | struct io_timeout_data *data = container_of(timer, |
5512 | struct io_timeout_data, timer); | |
5513 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5514 | struct io_ring_ctx *ctx = req->ctx; |
5515 | struct io_kiocb *prev = NULL; | |
5516 | unsigned long flags; | |
2665abfd JA |
5517 | |
5518 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5519 | ||
5520 | /* | |
5521 | * We don't expect the list to be empty, that will only happen if we | |
5522 | * race with the completion of the linked work. | |
5523 | */ | |
4493233e PB |
5524 | if (!list_empty(&req->link_list)) { |
5525 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5526 | link_list); | |
5d960724 | 5527 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5528 | list_del_init(&req->link_list); |
5d960724 JA |
5529 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5530 | } else | |
76a46e06 | 5531 | prev = NULL; |
2665abfd JA |
5532 | } |
5533 | ||
5534 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5535 | ||
5536 | if (prev) { | |
4e88d6e7 | 5537 | req_set_fail_links(prev); |
014db007 | 5538 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5539 | io_put_req(prev); |
47f46768 JA |
5540 | } else { |
5541 | io_cqring_add_event(req, -ETIME); | |
5542 | io_put_req(req); | |
2665abfd | 5543 | } |
2665abfd JA |
5544 | return HRTIMER_NORESTART; |
5545 | } | |
5546 | ||
ad8a48ac | 5547 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5548 | { |
76a46e06 | 5549 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5550 | |
76a46e06 JA |
5551 | /* |
5552 | * If the list is now empty, then our linked request finished before | |
5553 | * we got a chance to setup the timer | |
5554 | */ | |
5555 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5556 | if (!list_empty(&req->link_list)) { |
2d28390a | 5557 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5558 | |
ad8a48ac JA |
5559 | data->timer.function = io_link_timeout_fn; |
5560 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5561 | data->mode); | |
2665abfd | 5562 | } |
76a46e06 | 5563 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5564 | |
2665abfd | 5565 | /* drop submission reference */ |
76a46e06 JA |
5566 | io_put_req(req); |
5567 | } | |
2665abfd | 5568 | |
ad8a48ac | 5569 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5570 | { |
5571 | struct io_kiocb *nxt; | |
5572 | ||
dea3b49c | 5573 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 5574 | return NULL; |
d7718a9d JA |
5575 | /* for polled retry, if flag is set, we already went through here */ |
5576 | if (req->flags & REQ_F_POLLED) | |
5577 | return NULL; | |
2665abfd | 5578 | |
4493233e PB |
5579 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5580 | link_list); | |
d625c6ee | 5581 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5582 | return NULL; |
2665abfd | 5583 | |
76a46e06 | 5584 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5585 | return nxt; |
2665abfd JA |
5586 | } |
5587 | ||
3529d8c2 | 5588 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 5589 | { |
4a0a7a18 | 5590 | struct io_kiocb *linked_timeout; |
4bc4494e | 5591 | struct io_kiocb *nxt; |
193155c8 | 5592 | const struct cred *old_creds = NULL; |
e0c5c576 | 5593 | int ret; |
2b188cc1 | 5594 | |
4a0a7a18 JA |
5595 | again: |
5596 | linked_timeout = io_prep_linked_timeout(req); | |
5597 | ||
193155c8 JA |
5598 | if (req->work.creds && req->work.creds != current_cred()) { |
5599 | if (old_creds) | |
5600 | revert_creds(old_creds); | |
5601 | if (old_creds == req->work.creds) | |
5602 | old_creds = NULL; /* restored original creds */ | |
5603 | else | |
5604 | old_creds = override_creds(req->work.creds); | |
5605 | } | |
5606 | ||
014db007 | 5607 | ret = io_issue_sqe(req, sqe, true); |
491381ce JA |
5608 | |
5609 | /* | |
5610 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5611 | * doesn't support non-blocking read/write attempts | |
5612 | */ | |
5613 | if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) || | |
5614 | (req->flags & REQ_F_MUST_PUNT))) { | |
d7718a9d JA |
5615 | if (io_arm_poll_handler(req)) { |
5616 | if (linked_timeout) | |
5617 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5618 | goto exit; |
d7718a9d | 5619 | } |
86a761f8 | 5620 | punt: |
f86cd20c | 5621 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5622 | ret = io_grab_files(req); |
5623 | if (ret) | |
5624 | goto err; | |
2b188cc1 | 5625 | } |
bbad27b2 PB |
5626 | |
5627 | /* | |
5628 | * Queued up for async execution, worker will release | |
5629 | * submit reference when the iocb is actually submitted. | |
5630 | */ | |
5631 | io_queue_async_work(req); | |
4bc4494e | 5632 | goto exit; |
2b188cc1 | 5633 | } |
e65ef56d | 5634 | |
fcb323cc | 5635 | err: |
4bc4494e | 5636 | nxt = NULL; |
76a46e06 | 5637 | /* drop submission reference */ |
2a44f467 | 5638 | io_put_req_find_next(req, &nxt); |
e65ef56d | 5639 | |
f9bd67f6 | 5640 | if (linked_timeout) { |
76a46e06 | 5641 | if (!ret) |
f9bd67f6 | 5642 | io_queue_linked_timeout(linked_timeout); |
76a46e06 | 5643 | else |
f9bd67f6 | 5644 | io_put_req(linked_timeout); |
76a46e06 JA |
5645 | } |
5646 | ||
e65ef56d | 5647 | /* and drop final reference, if we failed */ |
9e645e11 | 5648 | if (ret) { |
78e19bbe | 5649 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5650 | req_set_fail_links(req); |
e65ef56d | 5651 | io_put_req(req); |
9e645e11 | 5652 | } |
4a0a7a18 JA |
5653 | if (nxt) { |
5654 | req = nxt; | |
86a761f8 PB |
5655 | |
5656 | if (req->flags & REQ_F_FORCE_ASYNC) | |
5657 | goto punt; | |
4a0a7a18 JA |
5658 | goto again; |
5659 | } | |
4bc4494e | 5660 | exit: |
193155c8 JA |
5661 | if (old_creds) |
5662 | revert_creds(old_creds); | |
2b188cc1 JA |
5663 | } |
5664 | ||
3529d8c2 | 5665 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
5666 | { |
5667 | int ret; | |
5668 | ||
3529d8c2 | 5669 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
5670 | if (ret) { |
5671 | if (ret != -EIOCBQUEUED) { | |
1118591a | 5672 | fail_req: |
78e19bbe | 5673 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5674 | req_set_fail_links(req); |
78e19bbe | 5675 | io_double_put_req(req); |
4fe2c963 | 5676 | } |
2550878f | 5677 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a PB |
5678 | if (!req->io) { |
5679 | ret = -EAGAIN; | |
5680 | if (io_alloc_async_ctx(req)) | |
5681 | goto fail_req; | |
5682 | ret = io_req_defer_prep(req, sqe); | |
5683 | if (unlikely(ret < 0)) | |
5684 | goto fail_req; | |
5685 | } | |
5686 | ||
ce35a47a JA |
5687 | /* |
5688 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
5689 | * to async execution. | |
5690 | */ | |
5691 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
5692 | io_queue_async_work(req); | |
5693 | } else { | |
3529d8c2 | 5694 | __io_queue_sqe(req, sqe); |
ce35a47a | 5695 | } |
4fe2c963 JL |
5696 | } |
5697 | ||
1b4a51b6 | 5698 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 5699 | { |
94ae5e77 | 5700 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
1b4a51b6 PB |
5701 | io_cqring_add_event(req, -ECANCELED); |
5702 | io_double_put_req(req); | |
5703 | } else | |
3529d8c2 | 5704 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
5705 | } |
5706 | ||
1d4240cc | 5707 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
7d01bd74 | 5708 | struct io_kiocb **link) |
9e645e11 | 5709 | { |
a197f664 | 5710 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 5711 | int ret; |
9e645e11 | 5712 | |
9e645e11 JA |
5713 | /* |
5714 | * If we already have a head request, queue this one for async | |
5715 | * submittal once the head completes. If we don't have a head but | |
5716 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
5717 | * submitted sync once the chain is complete. If none of those | |
5718 | * conditions are true (normal request), then just queue it. | |
5719 | */ | |
5720 | if (*link) { | |
9d76377f | 5721 | struct io_kiocb *head = *link; |
4e88d6e7 | 5722 | |
8cdf2193 PB |
5723 | /* |
5724 | * Taking sequential execution of a link, draining both sides | |
5725 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
5726 | * requests in the link. So, it drains the head and the | |
5727 | * next after the link request. The last one is done via | |
5728 | * drain_next flag to persist the effect across calls. | |
5729 | */ | |
ef4ff581 | 5730 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
5731 | head->flags |= REQ_F_IO_DRAIN; |
5732 | ctx->drain_next = 1; | |
5733 | } | |
1d4240cc PB |
5734 | if (io_alloc_async_ctx(req)) |
5735 | return -EAGAIN; | |
9e645e11 | 5736 | |
3529d8c2 | 5737 | ret = io_req_defer_prep(req, sqe); |
2d28390a | 5738 | if (ret) { |
4e88d6e7 | 5739 | /* fail even hard links since we don't submit */ |
9d76377f | 5740 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 5741 | return ret; |
2d28390a | 5742 | } |
9d76377f PB |
5743 | trace_io_uring_link(ctx, req, head); |
5744 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
5745 | |
5746 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 5747 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
32fe525b PB |
5748 | io_queue_link_head(head); |
5749 | *link = NULL; | |
5750 | } | |
9e645e11 | 5751 | } else { |
711be031 PB |
5752 | if (unlikely(ctx->drain_next)) { |
5753 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 5754 | ctx->drain_next = 0; |
711be031 | 5755 | } |
ef4ff581 | 5756 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 5757 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 5758 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 5759 | |
1d4240cc PB |
5760 | if (io_alloc_async_ctx(req)) |
5761 | return -EAGAIN; | |
5762 | ||
711be031 PB |
5763 | ret = io_req_defer_prep(req, sqe); |
5764 | if (ret) | |
5765 | req->flags |= REQ_F_FAIL_LINK; | |
5766 | *link = req; | |
5767 | } else { | |
5768 | io_queue_sqe(req, sqe); | |
5769 | } | |
9e645e11 | 5770 | } |
2e6e1fde | 5771 | |
1d4240cc | 5772 | return 0; |
9e645e11 JA |
5773 | } |
5774 | ||
9a56a232 JA |
5775 | /* |
5776 | * Batched submission is done, ensure local IO is flushed out. | |
5777 | */ | |
5778 | static void io_submit_state_end(struct io_submit_state *state) | |
5779 | { | |
5780 | blk_finish_plug(&state->plug); | |
9f13c35b | 5781 | io_state_file_put(state); |
2579f913 | 5782 | if (state->free_reqs) |
6c8a3134 | 5783 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
5784 | } |
5785 | ||
5786 | /* | |
5787 | * Start submission side cache. | |
5788 | */ | |
5789 | static void io_submit_state_start(struct io_submit_state *state, | |
22efde59 | 5790 | unsigned int max_ios) |
9a56a232 JA |
5791 | { |
5792 | blk_start_plug(&state->plug); | |
2579f913 | 5793 | state->free_reqs = 0; |
9a56a232 JA |
5794 | state->file = NULL; |
5795 | state->ios_left = max_ios; | |
5796 | } | |
5797 | ||
2b188cc1 JA |
5798 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
5799 | { | |
75b28aff | 5800 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 5801 | |
caf582c6 PB |
5802 | /* |
5803 | * Ensure any loads from the SQEs are done at this point, | |
5804 | * since once we write the new head, the application could | |
5805 | * write new data to them. | |
5806 | */ | |
5807 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
5808 | } |
5809 | ||
2b188cc1 | 5810 | /* |
3529d8c2 | 5811 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
5812 | * that is mapped by userspace. This means that care needs to be taken to |
5813 | * ensure that reads are stable, as we cannot rely on userspace always | |
5814 | * being a good citizen. If members of the sqe are validated and then later | |
5815 | * used, it's important that those reads are done through READ_ONCE() to | |
5816 | * prevent a re-load down the line. | |
5817 | */ | |
709b302f | 5818 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 5819 | { |
75b28aff | 5820 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
5821 | unsigned head; |
5822 | ||
5823 | /* | |
5824 | * The cached sq head (or cq tail) serves two purposes: | |
5825 | * | |
5826 | * 1) allows us to batch the cost of updating the user visible | |
5827 | * head updates. | |
5828 | * 2) allows the kernel side to track the head on its own, even | |
5829 | * though the application is the one updating it. | |
5830 | */ | |
ee7d46d9 | 5831 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
5832 | if (likely(head < ctx->sq_entries)) |
5833 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
5834 | |
5835 | /* drop invalid entries */ | |
498ccd9e | 5836 | ctx->cached_sq_dropped++; |
ee7d46d9 | 5837 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
5838 | return NULL; |
5839 | } | |
5840 | ||
5841 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
5842 | { | |
5843 | ctx->cached_sq_head++; | |
2b188cc1 JA |
5844 | } |
5845 | ||
ef4ff581 PB |
5846 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
5847 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
5848 | IOSQE_BUFFER_SELECT) | |
5849 | ||
5850 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
5851 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 5852 | struct io_submit_state *state) |
0553b8bd | 5853 | { |
ef4ff581 | 5854 | unsigned int sqe_flags; |
63ff8223 | 5855 | int id; |
ef4ff581 | 5856 | |
0553b8bd PB |
5857 | /* |
5858 | * All io need record the previous position, if LINK vs DARIN, | |
5859 | * it can be used to mark the position of the first IO in the | |
5860 | * link list. | |
5861 | */ | |
31af27c7 | 5862 | req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped; |
0553b8bd PB |
5863 | req->opcode = READ_ONCE(sqe->opcode); |
5864 | req->user_data = READ_ONCE(sqe->user_data); | |
5865 | req->io = NULL; | |
5866 | req->file = NULL; | |
5867 | req->ctx = ctx; | |
5868 | req->flags = 0; | |
5869 | /* one is dropped after submission, the other at completion */ | |
5870 | refcount_set(&req->refs, 2); | |
5871 | req->task = NULL; | |
5872 | req->result = 0; | |
5873 | INIT_IO_WORK(&req->work, io_wq_submit_work); | |
ef4ff581 PB |
5874 | |
5875 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
5876 | return -EINVAL; | |
5877 | ||
5878 | if (io_op_defs[req->opcode].needs_mm && !current->mm) { | |
5879 | if (unlikely(!mmget_not_zero(ctx->sqo_mm))) | |
5880 | return -EFAULT; | |
5881 | use_mm(ctx->sqo_mm); | |
5882 | } | |
5883 | ||
5884 | sqe_flags = READ_ONCE(sqe->flags); | |
5885 | /* enforce forwards compatibility on users */ | |
5886 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
5887 | return -EINVAL; | |
5888 | ||
5889 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
5890 | !io_op_defs[req->opcode].buffer_select) | |
5891 | return -EOPNOTSUPP; | |
5892 | ||
5893 | id = READ_ONCE(sqe->personality); | |
5894 | if (id) { | |
5895 | req->work.creds = idr_find(&ctx->personality_idr, id); | |
5896 | if (unlikely(!req->work.creds)) | |
5897 | return -EINVAL; | |
5898 | get_cred(req->work.creds); | |
5899 | } | |
5900 | ||
5901 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 5902 | req->flags |= sqe_flags; |
ef4ff581 | 5903 | |
63ff8223 JA |
5904 | if (!io_op_defs[req->opcode].needs_file) |
5905 | return 0; | |
5906 | ||
5907 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
5908 | } |
5909 | ||
fb5ccc98 | 5910 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 5911 | struct file *ring_file, int ring_fd) |
6c271ce2 JA |
5912 | { |
5913 | struct io_submit_state state, *statep = NULL; | |
9e645e11 | 5914 | struct io_kiocb *link = NULL; |
9e645e11 | 5915 | int i, submitted = 0; |
6c271ce2 | 5916 | |
c4a2ed72 | 5917 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
5918 | if (test_bit(0, &ctx->sq_check_overflow)) { |
5919 | if (!list_empty(&ctx->cq_overflow_list) && | |
5920 | !io_cqring_overflow_flush(ctx, false)) | |
5921 | return -EBUSY; | |
5922 | } | |
6c271ce2 | 5923 | |
ee7d46d9 PB |
5924 | /* make sure SQ entry isn't read before tail */ |
5925 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 5926 | |
2b85edfc PB |
5927 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
5928 | return -EAGAIN; | |
6c271ce2 JA |
5929 | |
5930 | if (nr > IO_PLUG_THRESHOLD) { | |
22efde59 | 5931 | io_submit_state_start(&state, nr); |
6c271ce2 JA |
5932 | statep = &state; |
5933 | } | |
5934 | ||
b14cca0c PB |
5935 | ctx->ring_fd = ring_fd; |
5936 | ctx->ring_file = ring_file; | |
5937 | ||
6c271ce2 | 5938 | for (i = 0; i < nr; i++) { |
3529d8c2 | 5939 | const struct io_uring_sqe *sqe; |
196be95c | 5940 | struct io_kiocb *req; |
1cb1edb2 | 5941 | int err; |
fb5ccc98 | 5942 | |
b1e50e54 PB |
5943 | sqe = io_get_sqe(ctx); |
5944 | if (unlikely(!sqe)) { | |
5945 | io_consume_sqe(ctx); | |
5946 | break; | |
5947 | } | |
0553b8bd | 5948 | req = io_alloc_req(ctx, statep); |
196be95c PB |
5949 | if (unlikely(!req)) { |
5950 | if (!submitted) | |
5951 | submitted = -EAGAIN; | |
fb5ccc98 | 5952 | break; |
196be95c | 5953 | } |
fb5ccc98 | 5954 | |
0cdaf760 | 5955 | err = io_init_req(ctx, req, sqe, statep); |
709b302f | 5956 | io_consume_sqe(ctx); |
d3656344 JA |
5957 | /* will complete beyond this point, count as submitted */ |
5958 | submitted++; | |
5959 | ||
ef4ff581 | 5960 | if (unlikely(err)) { |
1cb1edb2 PB |
5961 | fail_req: |
5962 | io_cqring_add_event(req, err); | |
d3656344 | 5963 | io_double_put_req(req); |
196be95c PB |
5964 | break; |
5965 | } | |
fb5ccc98 | 5966 | |
354420f7 | 5967 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 5968 | true, io_async_submit(ctx)); |
7d01bd74 | 5969 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
5970 | if (err) |
5971 | goto fail_req; | |
6c271ce2 JA |
5972 | } |
5973 | ||
9466f437 PB |
5974 | if (unlikely(submitted != nr)) { |
5975 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
5976 | ||
5977 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
5978 | } | |
9e645e11 | 5979 | if (link) |
1b4a51b6 | 5980 | io_queue_link_head(link); |
6c271ce2 JA |
5981 | if (statep) |
5982 | io_submit_state_end(&state); | |
5983 | ||
ae9428ca PB |
5984 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
5985 | io_commit_sqring(ctx); | |
5986 | ||
6c271ce2 JA |
5987 | return submitted; |
5988 | } | |
5989 | ||
bf9c2f1c PB |
5990 | static inline void io_sq_thread_drop_mm(struct io_ring_ctx *ctx) |
5991 | { | |
5992 | struct mm_struct *mm = current->mm; | |
5993 | ||
5994 | if (mm) { | |
5995 | unuse_mm(mm); | |
5996 | mmput(mm); | |
5997 | } | |
5998 | } | |
5999 | ||
6c271ce2 JA |
6000 | static int io_sq_thread(void *data) |
6001 | { | |
6c271ce2 | 6002 | struct io_ring_ctx *ctx = data; |
181e448d | 6003 | const struct cred *old_cred; |
6c271ce2 JA |
6004 | mm_segment_t old_fs; |
6005 | DEFINE_WAIT(wait); | |
6c271ce2 | 6006 | unsigned long timeout; |
bdcd3eab | 6007 | int ret = 0; |
6c271ce2 | 6008 | |
0f158b4c | 6009 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6010 | |
6c271ce2 JA |
6011 | old_fs = get_fs(); |
6012 | set_fs(USER_DS); | |
181e448d | 6013 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6014 | |
bdcd3eab | 6015 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6016 | while (!kthread_should_park()) { |
fb5ccc98 | 6017 | unsigned int to_submit; |
6c271ce2 | 6018 | |
bdcd3eab | 6019 | if (!list_empty(&ctx->poll_list)) { |
6c271ce2 JA |
6020 | unsigned nr_events = 0; |
6021 | ||
bdcd3eab XW |
6022 | mutex_lock(&ctx->uring_lock); |
6023 | if (!list_empty(&ctx->poll_list)) | |
6024 | io_iopoll_getevents(ctx, &nr_events, 0); | |
6025 | else | |
6c271ce2 | 6026 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6027 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6028 | } |
6029 | ||
fb5ccc98 | 6030 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6031 | |
6032 | /* | |
6033 | * If submit got -EBUSY, flag us as needing the application | |
6034 | * to enter the kernel to reap and flush events. | |
6035 | */ | |
6036 | if (!to_submit || ret == -EBUSY) { | |
7143b5ac SG |
6037 | /* |
6038 | * Drop cur_mm before scheduling, we can't hold it for | |
6039 | * long periods (or over schedule()). Do this before | |
6040 | * adding ourselves to the waitqueue, as the unuse/drop | |
6041 | * may sleep. | |
6042 | */ | |
bf9c2f1c | 6043 | io_sq_thread_drop_mm(ctx); |
7143b5ac | 6044 | |
6c271ce2 JA |
6045 | /* |
6046 | * We're polling. If we're within the defined idle | |
6047 | * period, then let us spin without work before going | |
c1edbf5f JA |
6048 | * to sleep. The exception is if we got EBUSY doing |
6049 | * more IO, we should wait for the application to | |
6050 | * reap events and wake us up. | |
6c271ce2 | 6051 | */ |
bdcd3eab | 6052 | if (!list_empty(&ctx->poll_list) || |
df069d80 JA |
6053 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6054 | !percpu_ref_is_dying(&ctx->refs))) { | |
b41e9852 JA |
6055 | if (current->task_works) |
6056 | task_work_run(); | |
9831a90c | 6057 | cond_resched(); |
6c271ce2 JA |
6058 | continue; |
6059 | } | |
6060 | ||
6c271ce2 JA |
6061 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6062 | TASK_INTERRUPTIBLE); | |
6063 | ||
bdcd3eab XW |
6064 | /* |
6065 | * While doing polled IO, before going to sleep, we need | |
6066 | * to check if there are new reqs added to poll_list, it | |
6067 | * is because reqs may have been punted to io worker and | |
6068 | * will be added to poll_list later, hence check the | |
6069 | * poll_list again. | |
6070 | */ | |
6071 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6072 | !list_empty_careful(&ctx->poll_list)) { | |
6073 | finish_wait(&ctx->sqo_wait, &wait); | |
6074 | continue; | |
6075 | } | |
6076 | ||
6c271ce2 | 6077 | /* Tell userspace we may need a wakeup call */ |
75b28aff | 6078 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
0d7bae69 SB |
6079 | /* make sure to read SQ tail after writing flags */ |
6080 | smp_mb(); | |
6c271ce2 | 6081 | |
fb5ccc98 | 6082 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6083 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6084 | if (kthread_should_park()) { |
6c271ce2 JA |
6085 | finish_wait(&ctx->sqo_wait, &wait); |
6086 | break; | |
6087 | } | |
b41e9852 JA |
6088 | if (current->task_works) { |
6089 | task_work_run(); | |
10bea96d | 6090 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
6091 | continue; |
6092 | } | |
6c271ce2 JA |
6093 | if (signal_pending(current)) |
6094 | flush_signals(current); | |
6095 | schedule(); | |
6096 | finish_wait(&ctx->sqo_wait, &wait); | |
6097 | ||
75b28aff | 6098 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
d4ae271d | 6099 | ret = 0; |
6c271ce2 JA |
6100 | continue; |
6101 | } | |
6102 | finish_wait(&ctx->sqo_wait, &wait); | |
6103 | ||
75b28aff | 6104 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
6105 | } |
6106 | ||
8a4955ff | 6107 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6108 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6109 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6110 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6111 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6112 | } |
6113 | ||
b41e9852 JA |
6114 | if (current->task_works) |
6115 | task_work_run(); | |
6116 | ||
6c271ce2 | 6117 | set_fs(old_fs); |
bf9c2f1c | 6118 | io_sq_thread_drop_mm(ctx); |
181e448d | 6119 | revert_creds(old_cred); |
06058632 | 6120 | |
2bbcd6d3 | 6121 | kthread_parkme(); |
06058632 | 6122 | |
6c271ce2 JA |
6123 | return 0; |
6124 | } | |
6125 | ||
bda52162 JA |
6126 | struct io_wait_queue { |
6127 | struct wait_queue_entry wq; | |
6128 | struct io_ring_ctx *ctx; | |
6129 | unsigned to_wait; | |
6130 | unsigned nr_timeouts; | |
6131 | }; | |
6132 | ||
1d7bb1d5 | 6133 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6134 | { |
6135 | struct io_ring_ctx *ctx = iowq->ctx; | |
6136 | ||
6137 | /* | |
d195a66e | 6138 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6139 | * started waiting. For timeouts, we always want to return to userspace, |
6140 | * regardless of event count. | |
6141 | */ | |
1d7bb1d5 | 6142 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6143 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6144 | } | |
6145 | ||
6146 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6147 | int wake_flags, void *key) | |
6148 | { | |
6149 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6150 | wq); | |
6151 | ||
1d7bb1d5 JA |
6152 | /* use noflush == true, as we can't safely rely on locking context */ |
6153 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6154 | return -1; |
6155 | ||
6156 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6157 | } | |
6158 | ||
2b188cc1 JA |
6159 | /* |
6160 | * Wait until events become available, if we don't already have some. The | |
6161 | * application must reap them itself, as they reside on the shared cq ring. | |
6162 | */ | |
6163 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6164 | const sigset_t __user *sig, size_t sigsz) | |
6165 | { | |
bda52162 JA |
6166 | struct io_wait_queue iowq = { |
6167 | .wq = { | |
6168 | .private = current, | |
6169 | .func = io_wake_function, | |
6170 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6171 | }, | |
6172 | .ctx = ctx, | |
6173 | .to_wait = min_events, | |
6174 | }; | |
75b28aff | 6175 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6176 | int ret = 0; |
2b188cc1 | 6177 | |
b41e9852 JA |
6178 | do { |
6179 | if (io_cqring_events(ctx, false) >= min_events) | |
6180 | return 0; | |
6181 | if (!current->task_works) | |
6182 | break; | |
6183 | task_work_run(); | |
6184 | } while (1); | |
2b188cc1 JA |
6185 | |
6186 | if (sig) { | |
9e75ad5d AB |
6187 | #ifdef CONFIG_COMPAT |
6188 | if (in_compat_syscall()) | |
6189 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6190 | sigsz); |
9e75ad5d AB |
6191 | else |
6192 | #endif | |
b772434b | 6193 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6194 | |
2b188cc1 JA |
6195 | if (ret) |
6196 | return ret; | |
6197 | } | |
6198 | ||
bda52162 | 6199 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6200 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6201 | do { |
6202 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6203 | TASK_INTERRUPTIBLE); | |
b41e9852 JA |
6204 | if (current->task_works) |
6205 | task_work_run(); | |
1d7bb1d5 | 6206 | if (io_should_wake(&iowq, false)) |
bda52162 JA |
6207 | break; |
6208 | schedule(); | |
6209 | if (signal_pending(current)) { | |
e9ffa5c2 | 6210 | ret = -EINTR; |
bda52162 JA |
6211 | break; |
6212 | } | |
6213 | } while (1); | |
6214 | finish_wait(&ctx->wait, &iowq.wq); | |
6215 | ||
e9ffa5c2 | 6216 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6217 | |
75b28aff | 6218 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6219 | } |
6220 | ||
6b06314c JA |
6221 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6222 | { | |
6223 | #if defined(CONFIG_UNIX) | |
6224 | if (ctx->ring_sock) { | |
6225 | struct sock *sock = ctx->ring_sock->sk; | |
6226 | struct sk_buff *skb; | |
6227 | ||
6228 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6229 | kfree_skb(skb); | |
6230 | } | |
6231 | #else | |
6232 | int i; | |
6233 | ||
65e19f54 JA |
6234 | for (i = 0; i < ctx->nr_user_files; i++) { |
6235 | struct file *file; | |
6236 | ||
6237 | file = io_file_from_index(ctx, i); | |
6238 | if (file) | |
6239 | fput(file); | |
6240 | } | |
6b06314c JA |
6241 | #endif |
6242 | } | |
6243 | ||
05f3fb3c JA |
6244 | static void io_file_ref_kill(struct percpu_ref *ref) |
6245 | { | |
6246 | struct fixed_file_data *data; | |
6247 | ||
6248 | data = container_of(ref, struct fixed_file_data, refs); | |
6249 | complete(&data->done); | |
6250 | } | |
6251 | ||
6b06314c JA |
6252 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6253 | { | |
05f3fb3c | 6254 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6255 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6256 | unsigned nr_tables, i; |
6257 | ||
05f3fb3c | 6258 | if (!data) |
6b06314c JA |
6259 | return -ENXIO; |
6260 | ||
6a4d07cd | 6261 | spin_lock(&data->lock); |
05589553 XW |
6262 | if (!list_empty(&data->ref_list)) |
6263 | ref_node = list_first_entry(&data->ref_list, | |
6264 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6265 | spin_unlock(&data->lock); |
05589553 XW |
6266 | if (ref_node) |
6267 | percpu_ref_kill(&ref_node->refs); | |
6268 | ||
6269 | percpu_ref_kill(&data->refs); | |
6270 | ||
6271 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6272 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6273 | wait_for_completion(&data->done); |
05f3fb3c | 6274 | |
6b06314c | 6275 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6276 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6277 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6278 | kfree(data->table[i].files); |
6279 | kfree(data->table); | |
05589553 XW |
6280 | percpu_ref_exit(&data->refs); |
6281 | kfree(data); | |
05f3fb3c | 6282 | ctx->file_data = NULL; |
6b06314c JA |
6283 | ctx->nr_user_files = 0; |
6284 | return 0; | |
6285 | } | |
6286 | ||
6c271ce2 JA |
6287 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6288 | { | |
6289 | if (ctx->sqo_thread) { | |
0f158b4c | 6290 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6291 | /* |
6292 | * The park is a bit of a work-around, without it we get | |
6293 | * warning spews on shutdown with SQPOLL set and affinity | |
6294 | * set to a single CPU. | |
6295 | */ | |
06058632 | 6296 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6297 | kthread_stop(ctx->sqo_thread); |
6298 | ctx->sqo_thread = NULL; | |
6299 | } | |
6300 | } | |
6301 | ||
6b06314c JA |
6302 | static void io_finish_async(struct io_ring_ctx *ctx) |
6303 | { | |
6c271ce2 JA |
6304 | io_sq_thread_stop(ctx); |
6305 | ||
561fb04a JA |
6306 | if (ctx->io_wq) { |
6307 | io_wq_destroy(ctx->io_wq); | |
6308 | ctx->io_wq = NULL; | |
6b06314c JA |
6309 | } |
6310 | } | |
6311 | ||
6312 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6313 | /* |
6314 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6315 | * the io_uring can be safely unregistered on process exit, even if we have | |
6316 | * loops in the file referencing. | |
6317 | */ | |
6318 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6319 | { | |
6320 | struct sock *sk = ctx->ring_sock->sk; | |
6321 | struct scm_fp_list *fpl; | |
6322 | struct sk_buff *skb; | |
08a45173 | 6323 | int i, nr_files; |
6b06314c | 6324 | |
6b06314c JA |
6325 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6326 | if (!fpl) | |
6327 | return -ENOMEM; | |
6328 | ||
6329 | skb = alloc_skb(0, GFP_KERNEL); | |
6330 | if (!skb) { | |
6331 | kfree(fpl); | |
6332 | return -ENOMEM; | |
6333 | } | |
6334 | ||
6335 | skb->sk = sk; | |
6b06314c | 6336 | |
08a45173 | 6337 | nr_files = 0; |
6b06314c JA |
6338 | fpl->user = get_uid(ctx->user); |
6339 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6340 | struct file *file = io_file_from_index(ctx, i + offset); |
6341 | ||
6342 | if (!file) | |
08a45173 | 6343 | continue; |
65e19f54 | 6344 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6345 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6346 | nr_files++; | |
6b06314c JA |
6347 | } |
6348 | ||
08a45173 JA |
6349 | if (nr_files) { |
6350 | fpl->max = SCM_MAX_FD; | |
6351 | fpl->count = nr_files; | |
6352 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6353 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6354 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6355 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6356 | |
08a45173 JA |
6357 | for (i = 0; i < nr_files; i++) |
6358 | fput(fpl->fp[i]); | |
6359 | } else { | |
6360 | kfree_skb(skb); | |
6361 | kfree(fpl); | |
6362 | } | |
6b06314c JA |
6363 | |
6364 | return 0; | |
6365 | } | |
6366 | ||
6367 | /* | |
6368 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6369 | * causes regular reference counting to break down. We rely on the UNIX | |
6370 | * garbage collection to take care of this problem for us. | |
6371 | */ | |
6372 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6373 | { | |
6374 | unsigned left, total; | |
6375 | int ret = 0; | |
6376 | ||
6377 | total = 0; | |
6378 | left = ctx->nr_user_files; | |
6379 | while (left) { | |
6380 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6381 | |
6382 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6383 | if (ret) | |
6384 | break; | |
6385 | left -= this_files; | |
6386 | total += this_files; | |
6387 | } | |
6388 | ||
6389 | if (!ret) | |
6390 | return 0; | |
6391 | ||
6392 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6393 | struct file *file = io_file_from_index(ctx, total); |
6394 | ||
6395 | if (file) | |
6396 | fput(file); | |
6b06314c JA |
6397 | total++; |
6398 | } | |
6399 | ||
6400 | return ret; | |
6401 | } | |
6402 | #else | |
6403 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6404 | { | |
6405 | return 0; | |
6406 | } | |
6407 | #endif | |
6408 | ||
65e19f54 JA |
6409 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6410 | unsigned nr_files) | |
6411 | { | |
6412 | int i; | |
6413 | ||
6414 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6415 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6416 | unsigned this_files; |
6417 | ||
6418 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6419 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6420 | GFP_KERNEL); | |
6421 | if (!table->files) | |
6422 | break; | |
6423 | nr_files -= this_files; | |
6424 | } | |
6425 | ||
6426 | if (i == nr_tables) | |
6427 | return 0; | |
6428 | ||
6429 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6430 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6431 | kfree(table->files); |
6432 | } | |
6433 | return 1; | |
6434 | } | |
6435 | ||
05f3fb3c JA |
6436 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6437 | { | |
6438 | #if defined(CONFIG_UNIX) | |
6439 | struct sock *sock = ctx->ring_sock->sk; | |
6440 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6441 | struct sk_buff *skb; | |
6442 | int i; | |
6443 | ||
6444 | __skb_queue_head_init(&list); | |
6445 | ||
6446 | /* | |
6447 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6448 | * remove this entry and rearrange the file array. | |
6449 | */ | |
6450 | skb = skb_dequeue(head); | |
6451 | while (skb) { | |
6452 | struct scm_fp_list *fp; | |
6453 | ||
6454 | fp = UNIXCB(skb).fp; | |
6455 | for (i = 0; i < fp->count; i++) { | |
6456 | int left; | |
6457 | ||
6458 | if (fp->fp[i] != file) | |
6459 | continue; | |
6460 | ||
6461 | unix_notinflight(fp->user, fp->fp[i]); | |
6462 | left = fp->count - 1 - i; | |
6463 | if (left) { | |
6464 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6465 | left * sizeof(struct file *)); | |
6466 | } | |
6467 | fp->count--; | |
6468 | if (!fp->count) { | |
6469 | kfree_skb(skb); | |
6470 | skb = NULL; | |
6471 | } else { | |
6472 | __skb_queue_tail(&list, skb); | |
6473 | } | |
6474 | fput(file); | |
6475 | file = NULL; | |
6476 | break; | |
6477 | } | |
6478 | ||
6479 | if (!file) | |
6480 | break; | |
6481 | ||
6482 | __skb_queue_tail(&list, skb); | |
6483 | ||
6484 | skb = skb_dequeue(head); | |
6485 | } | |
6486 | ||
6487 | if (skb_peek(&list)) { | |
6488 | spin_lock_irq(&head->lock); | |
6489 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6490 | __skb_queue_tail(head, skb); | |
6491 | spin_unlock_irq(&head->lock); | |
6492 | } | |
6493 | #else | |
6494 | fput(file); | |
6495 | #endif | |
6496 | } | |
6497 | ||
6498 | struct io_file_put { | |
05589553 | 6499 | struct list_head list; |
05f3fb3c | 6500 | struct file *file; |
05f3fb3c JA |
6501 | }; |
6502 | ||
4a38aed2 | 6503 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6504 | { |
4a38aed2 JA |
6505 | struct fixed_file_data *file_data = ref_node->file_data; |
6506 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6507 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6508 | |
6509 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6510 | list_del(&pfile->list); |
05589553 XW |
6511 | io_ring_file_put(ctx, pfile->file); |
6512 | kfree(pfile); | |
65e19f54 | 6513 | } |
05589553 | 6514 | |
6a4d07cd JA |
6515 | spin_lock(&file_data->lock); |
6516 | list_del(&ref_node->node); | |
6517 | spin_unlock(&file_data->lock); | |
05589553 XW |
6518 | |
6519 | percpu_ref_exit(&ref_node->refs); | |
6520 | kfree(ref_node); | |
6521 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6522 | } |
65e19f54 | 6523 | |
4a38aed2 JA |
6524 | static void io_file_put_work(struct work_struct *work) |
6525 | { | |
6526 | struct io_ring_ctx *ctx; | |
6527 | struct llist_node *node; | |
6528 | ||
6529 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6530 | node = llist_del_all(&ctx->file_put_llist); | |
6531 | ||
6532 | while (node) { | |
6533 | struct fixed_file_ref_node *ref_node; | |
6534 | struct llist_node *next = node->next; | |
6535 | ||
6536 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6537 | __io_file_put_work(ref_node); | |
6538 | node = next; | |
6539 | } | |
6540 | } | |
6541 | ||
05589553 | 6542 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6543 | { |
05589553 | 6544 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6545 | struct io_ring_ctx *ctx; |
6546 | bool first_add; | |
6547 | int delay = HZ; | |
65e19f54 | 6548 | |
05589553 | 6549 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6550 | ctx = ref_node->file_data->ctx; |
05589553 | 6551 | |
4a38aed2 JA |
6552 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6553 | delay = 0; | |
05589553 | 6554 | |
4a38aed2 JA |
6555 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
6556 | if (!delay) | |
6557 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
6558 | else if (first_add) | |
6559 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 6560 | } |
65e19f54 | 6561 | |
05589553 XW |
6562 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6563 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6564 | { |
05589553 | 6565 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6566 | |
05589553 XW |
6567 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6568 | if (!ref_node) | |
6569 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6570 | |
05589553 XW |
6571 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6572 | 0, GFP_KERNEL)) { | |
6573 | kfree(ref_node); | |
6574 | return ERR_PTR(-ENOMEM); | |
6575 | } | |
6576 | INIT_LIST_HEAD(&ref_node->node); | |
6577 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
6578 | ref_node->file_data = ctx->file_data; |
6579 | return ref_node; | |
05589553 XW |
6580 | } |
6581 | ||
6582 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6583 | { | |
6584 | percpu_ref_exit(&ref_node->refs); | |
6585 | kfree(ref_node); | |
65e19f54 JA |
6586 | } |
6587 | ||
6b06314c JA |
6588 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6589 | unsigned nr_args) | |
6590 | { | |
6591 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6592 | unsigned nr_tables; |
05f3fb3c | 6593 | struct file *file; |
6b06314c JA |
6594 | int fd, ret = 0; |
6595 | unsigned i; | |
05589553 | 6596 | struct fixed_file_ref_node *ref_node; |
6b06314c | 6597 | |
05f3fb3c | 6598 | if (ctx->file_data) |
6b06314c JA |
6599 | return -EBUSY; |
6600 | if (!nr_args) | |
6601 | return -EINVAL; | |
6602 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6603 | return -EMFILE; | |
6604 | ||
05f3fb3c JA |
6605 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6606 | if (!ctx->file_data) | |
6607 | return -ENOMEM; | |
6608 | ctx->file_data->ctx = ctx; | |
6609 | init_completion(&ctx->file_data->done); | |
05589553 | 6610 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 6611 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 6612 | |
65e19f54 | 6613 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6614 | ctx->file_data->table = kcalloc(nr_tables, |
6615 | sizeof(struct fixed_file_table), | |
65e19f54 | 6616 | GFP_KERNEL); |
05f3fb3c JA |
6617 | if (!ctx->file_data->table) { |
6618 | kfree(ctx->file_data); | |
6619 | ctx->file_data = NULL; | |
6b06314c | 6620 | return -ENOMEM; |
05f3fb3c JA |
6621 | } |
6622 | ||
05589553 | 6623 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6624 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6625 | kfree(ctx->file_data->table); | |
6626 | kfree(ctx->file_data); | |
6627 | ctx->file_data = NULL; | |
6b06314c | 6628 | return -ENOMEM; |
05f3fb3c | 6629 | } |
6b06314c | 6630 | |
65e19f54 | 6631 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6632 | percpu_ref_exit(&ctx->file_data->refs); |
6633 | kfree(ctx->file_data->table); | |
6634 | kfree(ctx->file_data); | |
6635 | ctx->file_data = NULL; | |
65e19f54 JA |
6636 | return -ENOMEM; |
6637 | } | |
6638 | ||
08a45173 | 6639 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6640 | struct fixed_file_table *table; |
6641 | unsigned index; | |
6642 | ||
6b06314c JA |
6643 | ret = -EFAULT; |
6644 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6645 | break; | |
08a45173 JA |
6646 | /* allow sparse sets */ |
6647 | if (fd == -1) { | |
6648 | ret = 0; | |
6649 | continue; | |
6650 | } | |
6b06314c | 6651 | |
05f3fb3c | 6652 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6653 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6654 | file = fget(fd); |
6b06314c JA |
6655 | |
6656 | ret = -EBADF; | |
05f3fb3c | 6657 | if (!file) |
6b06314c | 6658 | break; |
05f3fb3c | 6659 | |
6b06314c JA |
6660 | /* |
6661 | * Don't allow io_uring instances to be registered. If UNIX | |
6662 | * isn't enabled, then this causes a reference cycle and this | |
6663 | * instance can never get freed. If UNIX is enabled we'll | |
6664 | * handle it just fine, but there's still no point in allowing | |
6665 | * a ring fd as it doesn't support regular read/write anyway. | |
6666 | */ | |
05f3fb3c JA |
6667 | if (file->f_op == &io_uring_fops) { |
6668 | fput(file); | |
6b06314c JA |
6669 | break; |
6670 | } | |
6b06314c | 6671 | ret = 0; |
05f3fb3c | 6672 | table->files[index] = file; |
6b06314c JA |
6673 | } |
6674 | ||
6675 | if (ret) { | |
65e19f54 | 6676 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
6677 | file = io_file_from_index(ctx, i); |
6678 | if (file) | |
6679 | fput(file); | |
6680 | } | |
6681 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 6682 | kfree(ctx->file_data->table[i].files); |
6b06314c | 6683 | |
05f3fb3c JA |
6684 | kfree(ctx->file_data->table); |
6685 | kfree(ctx->file_data); | |
6686 | ctx->file_data = NULL; | |
6b06314c JA |
6687 | ctx->nr_user_files = 0; |
6688 | return ret; | |
6689 | } | |
6690 | ||
6691 | ret = io_sqe_files_scm(ctx); | |
05589553 | 6692 | if (ret) { |
6b06314c | 6693 | io_sqe_files_unregister(ctx); |
05589553 XW |
6694 | return ret; |
6695 | } | |
6b06314c | 6696 | |
05589553 XW |
6697 | ref_node = alloc_fixed_file_ref_node(ctx); |
6698 | if (IS_ERR(ref_node)) { | |
6699 | io_sqe_files_unregister(ctx); | |
6700 | return PTR_ERR(ref_node); | |
6701 | } | |
6702 | ||
6703 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6704 | spin_lock(&ctx->file_data->lock); |
05589553 | 6705 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 6706 | spin_unlock(&ctx->file_data->lock); |
05589553 | 6707 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
6708 | return ret; |
6709 | } | |
6710 | ||
c3a31e60 JA |
6711 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
6712 | int index) | |
6713 | { | |
6714 | #if defined(CONFIG_UNIX) | |
6715 | struct sock *sock = ctx->ring_sock->sk; | |
6716 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
6717 | struct sk_buff *skb; | |
6718 | ||
6719 | /* | |
6720 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
6721 | * file set. If there's no room, fall back to allocating a new skb | |
6722 | * and filling it in. | |
6723 | */ | |
6724 | spin_lock_irq(&head->lock); | |
6725 | skb = skb_peek(head); | |
6726 | if (skb) { | |
6727 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
6728 | ||
6729 | if (fpl->count < SCM_MAX_FD) { | |
6730 | __skb_unlink(skb, head); | |
6731 | spin_unlock_irq(&head->lock); | |
6732 | fpl->fp[fpl->count] = get_file(file); | |
6733 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
6734 | fpl->count++; | |
6735 | spin_lock_irq(&head->lock); | |
6736 | __skb_queue_head(head, skb); | |
6737 | } else { | |
6738 | skb = NULL; | |
6739 | } | |
6740 | } | |
6741 | spin_unlock_irq(&head->lock); | |
6742 | ||
6743 | if (skb) { | |
6744 | fput(file); | |
6745 | return 0; | |
6746 | } | |
6747 | ||
6748 | return __io_sqe_files_scm(ctx, 1, index); | |
6749 | #else | |
6750 | return 0; | |
6751 | #endif | |
6752 | } | |
6753 | ||
a5318d3c | 6754 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 6755 | struct file *file) |
05f3fb3c | 6756 | { |
a5318d3c | 6757 | struct io_file_put *pfile; |
05589553 XW |
6758 | struct percpu_ref *refs = data->cur_refs; |
6759 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 6760 | |
05f3fb3c | 6761 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
6762 | if (!pfile) |
6763 | return -ENOMEM; | |
05f3fb3c | 6764 | |
05589553 | 6765 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 6766 | pfile->file = file; |
05589553 XW |
6767 | list_add(&pfile->list, &ref_node->file_list); |
6768 | ||
a5318d3c | 6769 | return 0; |
05f3fb3c JA |
6770 | } |
6771 | ||
6772 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
6773 | struct io_uring_files_update *up, | |
6774 | unsigned nr_args) | |
6775 | { | |
6776 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 6777 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6778 | struct file *file; |
c3a31e60 JA |
6779 | __s32 __user *fds; |
6780 | int fd, i, err; | |
6781 | __u32 done; | |
05589553 | 6782 | bool needs_switch = false; |
c3a31e60 | 6783 | |
05f3fb3c | 6784 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
6785 | return -EOVERFLOW; |
6786 | if (done > ctx->nr_user_files) | |
6787 | return -EINVAL; | |
6788 | ||
05589553 XW |
6789 | ref_node = alloc_fixed_file_ref_node(ctx); |
6790 | if (IS_ERR(ref_node)) | |
6791 | return PTR_ERR(ref_node); | |
6792 | ||
c3a31e60 | 6793 | done = 0; |
05f3fb3c | 6794 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 6795 | while (nr_args) { |
65e19f54 JA |
6796 | struct fixed_file_table *table; |
6797 | unsigned index; | |
6798 | ||
c3a31e60 JA |
6799 | err = 0; |
6800 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
6801 | err = -EFAULT; | |
6802 | break; | |
6803 | } | |
05f3fb3c JA |
6804 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
6805 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
6806 | index = i & IORING_FILE_TABLE_MASK; |
6807 | if (table->files[index]) { | |
05f3fb3c | 6808 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
6809 | err = io_queue_file_removal(data, file); |
6810 | if (err) | |
6811 | break; | |
65e19f54 | 6812 | table->files[index] = NULL; |
05589553 | 6813 | needs_switch = true; |
c3a31e60 JA |
6814 | } |
6815 | if (fd != -1) { | |
c3a31e60 JA |
6816 | file = fget(fd); |
6817 | if (!file) { | |
6818 | err = -EBADF; | |
6819 | break; | |
6820 | } | |
6821 | /* | |
6822 | * Don't allow io_uring instances to be registered. If | |
6823 | * UNIX isn't enabled, then this causes a reference | |
6824 | * cycle and this instance can never get freed. If UNIX | |
6825 | * is enabled we'll handle it just fine, but there's | |
6826 | * still no point in allowing a ring fd as it doesn't | |
6827 | * support regular read/write anyway. | |
6828 | */ | |
6829 | if (file->f_op == &io_uring_fops) { | |
6830 | fput(file); | |
6831 | err = -EBADF; | |
6832 | break; | |
6833 | } | |
65e19f54 | 6834 | table->files[index] = file; |
c3a31e60 JA |
6835 | err = io_sqe_file_register(ctx, file, i); |
6836 | if (err) | |
6837 | break; | |
6838 | } | |
6839 | nr_args--; | |
6840 | done++; | |
05f3fb3c JA |
6841 | up->offset++; |
6842 | } | |
6843 | ||
05589553 XW |
6844 | if (needs_switch) { |
6845 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 6846 | spin_lock(&data->lock); |
05589553 XW |
6847 | list_add(&ref_node->node, &data->ref_list); |
6848 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6849 | spin_unlock(&data->lock); |
05589553 XW |
6850 | percpu_ref_get(&ctx->file_data->refs); |
6851 | } else | |
6852 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
6853 | |
6854 | return done ? done : err; | |
6855 | } | |
05589553 | 6856 | |
05f3fb3c JA |
6857 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
6858 | unsigned nr_args) | |
6859 | { | |
6860 | struct io_uring_files_update up; | |
6861 | ||
6862 | if (!ctx->file_data) | |
6863 | return -ENXIO; | |
6864 | if (!nr_args) | |
6865 | return -EINVAL; | |
6866 | if (copy_from_user(&up, arg, sizeof(up))) | |
6867 | return -EFAULT; | |
6868 | if (up.resv) | |
6869 | return -EINVAL; | |
6870 | ||
6871 | return __io_sqe_files_update(ctx, &up, nr_args); | |
6872 | } | |
c3a31e60 | 6873 | |
e9fd9396 | 6874 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
6875 | { |
6876 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6877 | ||
e9fd9396 | 6878 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
6879 | io_put_req(req); |
6880 | } | |
6881 | ||
24369c2e PB |
6882 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
6883 | struct io_uring_params *p) | |
6884 | { | |
6885 | struct io_wq_data data; | |
6886 | struct fd f; | |
6887 | struct io_ring_ctx *ctx_attach; | |
6888 | unsigned int concurrency; | |
6889 | int ret = 0; | |
6890 | ||
6891 | data.user = ctx->user; | |
e9fd9396 | 6892 | data.free_work = io_free_work; |
24369c2e PB |
6893 | |
6894 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
6895 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
6896 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
6897 | ||
6898 | ctx->io_wq = io_wq_create(concurrency, &data); | |
6899 | if (IS_ERR(ctx->io_wq)) { | |
6900 | ret = PTR_ERR(ctx->io_wq); | |
6901 | ctx->io_wq = NULL; | |
6902 | } | |
6903 | return ret; | |
6904 | } | |
6905 | ||
6906 | f = fdget(p->wq_fd); | |
6907 | if (!f.file) | |
6908 | return -EBADF; | |
6909 | ||
6910 | if (f.file->f_op != &io_uring_fops) { | |
6911 | ret = -EINVAL; | |
6912 | goto out_fput; | |
6913 | } | |
6914 | ||
6915 | ctx_attach = f.file->private_data; | |
6916 | /* @io_wq is protected by holding the fd */ | |
6917 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
6918 | ret = -EINVAL; | |
6919 | goto out_fput; | |
6920 | } | |
6921 | ||
6922 | ctx->io_wq = ctx_attach->io_wq; | |
6923 | out_fput: | |
6924 | fdput(f); | |
6925 | return ret; | |
6926 | } | |
6927 | ||
6c271ce2 JA |
6928 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
6929 | struct io_uring_params *p) | |
2b188cc1 JA |
6930 | { |
6931 | int ret; | |
6932 | ||
6933 | mmgrab(current->mm); | |
6934 | ctx->sqo_mm = current->mm; | |
6935 | ||
6c271ce2 | 6936 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
6937 | ret = -EPERM; |
6938 | if (!capable(CAP_SYS_ADMIN)) | |
6939 | goto err; | |
6940 | ||
917257da JA |
6941 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
6942 | if (!ctx->sq_thread_idle) | |
6943 | ctx->sq_thread_idle = HZ; | |
6944 | ||
6c271ce2 | 6945 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 6946 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 6947 | |
917257da | 6948 | ret = -EINVAL; |
44a9bd18 JA |
6949 | if (cpu >= nr_cpu_ids) |
6950 | goto err; | |
7889f44d | 6951 | if (!cpu_online(cpu)) |
917257da JA |
6952 | goto err; |
6953 | ||
6c271ce2 JA |
6954 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
6955 | ctx, cpu, | |
6956 | "io_uring-sq"); | |
6957 | } else { | |
6958 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
6959 | "io_uring-sq"); | |
6960 | } | |
6961 | if (IS_ERR(ctx->sqo_thread)) { | |
6962 | ret = PTR_ERR(ctx->sqo_thread); | |
6963 | ctx->sqo_thread = NULL; | |
6964 | goto err; | |
6965 | } | |
6966 | wake_up_process(ctx->sqo_thread); | |
6967 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
6968 | /* Can't have SQ_AFF without SQPOLL */ | |
6969 | ret = -EINVAL; | |
6970 | goto err; | |
6971 | } | |
6972 | ||
24369c2e PB |
6973 | ret = io_init_wq_offload(ctx, p); |
6974 | if (ret) | |
2b188cc1 | 6975 | goto err; |
2b188cc1 JA |
6976 | |
6977 | return 0; | |
6978 | err: | |
54a91f3b | 6979 | io_finish_async(ctx); |
2b188cc1 JA |
6980 | mmdrop(ctx->sqo_mm); |
6981 | ctx->sqo_mm = NULL; | |
6982 | return ret; | |
6983 | } | |
6984 | ||
6985 | static void io_unaccount_mem(struct user_struct *user, unsigned long nr_pages) | |
6986 | { | |
6987 | atomic_long_sub(nr_pages, &user->locked_vm); | |
6988 | } | |
6989 | ||
6990 | static int io_account_mem(struct user_struct *user, unsigned long nr_pages) | |
6991 | { | |
6992 | unsigned long page_limit, cur_pages, new_pages; | |
6993 | ||
6994 | /* Don't allow more pages than we can safely lock */ | |
6995 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
6996 | ||
6997 | do { | |
6998 | cur_pages = atomic_long_read(&user->locked_vm); | |
6999 | new_pages = cur_pages + nr_pages; | |
7000 | if (new_pages > page_limit) | |
7001 | return -ENOMEM; | |
7002 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7003 | new_pages) != cur_pages); | |
7004 | ||
7005 | return 0; | |
7006 | } | |
7007 | ||
7008 | static void io_mem_free(void *ptr) | |
7009 | { | |
52e04ef4 MR |
7010 | struct page *page; |
7011 | ||
7012 | if (!ptr) | |
7013 | return; | |
2b188cc1 | 7014 | |
52e04ef4 | 7015 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7016 | if (put_page_testzero(page)) |
7017 | free_compound_page(page); | |
7018 | } | |
7019 | ||
7020 | static void *io_mem_alloc(size_t size) | |
7021 | { | |
7022 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7023 | __GFP_NORETRY; | |
7024 | ||
7025 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7026 | } | |
7027 | ||
75b28aff HV |
7028 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7029 | size_t *sq_offset) | |
7030 | { | |
7031 | struct io_rings *rings; | |
7032 | size_t off, sq_array_size; | |
7033 | ||
7034 | off = struct_size(rings, cqes, cq_entries); | |
7035 | if (off == SIZE_MAX) | |
7036 | return SIZE_MAX; | |
7037 | ||
7038 | #ifdef CONFIG_SMP | |
7039 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7040 | if (off == 0) | |
7041 | return SIZE_MAX; | |
7042 | #endif | |
7043 | ||
7044 | sq_array_size = array_size(sizeof(u32), sq_entries); | |
7045 | if (sq_array_size == SIZE_MAX) | |
7046 | return SIZE_MAX; | |
7047 | ||
7048 | if (check_add_overflow(off, sq_array_size, &off)) | |
7049 | return SIZE_MAX; | |
7050 | ||
7051 | if (sq_offset) | |
7052 | *sq_offset = off; | |
7053 | ||
7054 | return off; | |
7055 | } | |
7056 | ||
2b188cc1 JA |
7057 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7058 | { | |
75b28aff | 7059 | size_t pages; |
2b188cc1 | 7060 | |
75b28aff HV |
7061 | pages = (size_t)1 << get_order( |
7062 | rings_size(sq_entries, cq_entries, NULL)); | |
7063 | pages += (size_t)1 << get_order( | |
7064 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7065 | |
75b28aff | 7066 | return pages; |
2b188cc1 JA |
7067 | } |
7068 | ||
edafccee JA |
7069 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7070 | { | |
7071 | int i, j; | |
7072 | ||
7073 | if (!ctx->user_bufs) | |
7074 | return -ENXIO; | |
7075 | ||
7076 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7077 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7078 | ||
7079 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7080 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee JA |
7081 | |
7082 | if (ctx->account_mem) | |
7083 | io_unaccount_mem(ctx->user, imu->nr_bvecs); | |
d4ef6475 | 7084 | kvfree(imu->bvec); |
edafccee JA |
7085 | imu->nr_bvecs = 0; |
7086 | } | |
7087 | ||
7088 | kfree(ctx->user_bufs); | |
7089 | ctx->user_bufs = NULL; | |
7090 | ctx->nr_user_bufs = 0; | |
7091 | return 0; | |
7092 | } | |
7093 | ||
7094 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7095 | void __user *arg, unsigned index) | |
7096 | { | |
7097 | struct iovec __user *src; | |
7098 | ||
7099 | #ifdef CONFIG_COMPAT | |
7100 | if (ctx->compat) { | |
7101 | struct compat_iovec __user *ciovs; | |
7102 | struct compat_iovec ciov; | |
7103 | ||
7104 | ciovs = (struct compat_iovec __user *) arg; | |
7105 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7106 | return -EFAULT; | |
7107 | ||
d55e5f5b | 7108 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7109 | dst->iov_len = ciov.iov_len; |
7110 | return 0; | |
7111 | } | |
7112 | #endif | |
7113 | src = (struct iovec __user *) arg; | |
7114 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7115 | return -EFAULT; | |
7116 | return 0; | |
7117 | } | |
7118 | ||
7119 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7120 | unsigned nr_args) | |
7121 | { | |
7122 | struct vm_area_struct **vmas = NULL; | |
7123 | struct page **pages = NULL; | |
7124 | int i, j, got_pages = 0; | |
7125 | int ret = -EINVAL; | |
7126 | ||
7127 | if (ctx->user_bufs) | |
7128 | return -EBUSY; | |
7129 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7130 | return -EINVAL; | |
7131 | ||
7132 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7133 | GFP_KERNEL); | |
7134 | if (!ctx->user_bufs) | |
7135 | return -ENOMEM; | |
7136 | ||
7137 | for (i = 0; i < nr_args; i++) { | |
7138 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7139 | unsigned long off, start, end, ubuf; | |
7140 | int pret, nr_pages; | |
7141 | struct iovec iov; | |
7142 | size_t size; | |
7143 | ||
7144 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7145 | if (ret) | |
a278682d | 7146 | goto err; |
edafccee JA |
7147 | |
7148 | /* | |
7149 | * Don't impose further limits on the size and buffer | |
7150 | * constraints here, we'll -EINVAL later when IO is | |
7151 | * submitted if they are wrong. | |
7152 | */ | |
7153 | ret = -EFAULT; | |
7154 | if (!iov.iov_base || !iov.iov_len) | |
7155 | goto err; | |
7156 | ||
7157 | /* arbitrary limit, but we need something */ | |
7158 | if (iov.iov_len > SZ_1G) | |
7159 | goto err; | |
7160 | ||
7161 | ubuf = (unsigned long) iov.iov_base; | |
7162 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7163 | start = ubuf >> PAGE_SHIFT; | |
7164 | nr_pages = end - start; | |
7165 | ||
7166 | if (ctx->account_mem) { | |
7167 | ret = io_account_mem(ctx->user, nr_pages); | |
7168 | if (ret) | |
7169 | goto err; | |
7170 | } | |
7171 | ||
7172 | ret = 0; | |
7173 | if (!pages || nr_pages > got_pages) { | |
7174 | kfree(vmas); | |
7175 | kfree(pages); | |
d4ef6475 | 7176 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7177 | GFP_KERNEL); |
d4ef6475 | 7178 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7179 | sizeof(struct vm_area_struct *), |
7180 | GFP_KERNEL); | |
7181 | if (!pages || !vmas) { | |
7182 | ret = -ENOMEM; | |
7183 | if (ctx->account_mem) | |
7184 | io_unaccount_mem(ctx->user, nr_pages); | |
7185 | goto err; | |
7186 | } | |
7187 | got_pages = nr_pages; | |
7188 | } | |
7189 | ||
d4ef6475 | 7190 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7191 | GFP_KERNEL); |
7192 | ret = -ENOMEM; | |
7193 | if (!imu->bvec) { | |
7194 | if (ctx->account_mem) | |
7195 | io_unaccount_mem(ctx->user, nr_pages); | |
7196 | goto err; | |
7197 | } | |
7198 | ||
7199 | ret = 0; | |
7200 | down_read(¤t->mm->mmap_sem); | |
2113b05d | 7201 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7202 | FOLL_WRITE | FOLL_LONGTERM, |
7203 | pages, vmas); | |
edafccee JA |
7204 | if (pret == nr_pages) { |
7205 | /* don't support file backed memory */ | |
7206 | for (j = 0; j < nr_pages; j++) { | |
7207 | struct vm_area_struct *vma = vmas[j]; | |
7208 | ||
7209 | if (vma->vm_file && | |
7210 | !is_file_hugepages(vma->vm_file)) { | |
7211 | ret = -EOPNOTSUPP; | |
7212 | break; | |
7213 | } | |
7214 | } | |
7215 | } else { | |
7216 | ret = pret < 0 ? pret : -EFAULT; | |
7217 | } | |
7218 | up_read(¤t->mm->mmap_sem); | |
7219 | if (ret) { | |
7220 | /* | |
7221 | * if we did partial map, or found file backed vmas, | |
7222 | * release any pages we did get | |
7223 | */ | |
27c4d3a3 | 7224 | if (pret > 0) |
f1f6a7dd | 7225 | unpin_user_pages(pages, pret); |
edafccee JA |
7226 | if (ctx->account_mem) |
7227 | io_unaccount_mem(ctx->user, nr_pages); | |
d4ef6475 | 7228 | kvfree(imu->bvec); |
edafccee JA |
7229 | goto err; |
7230 | } | |
7231 | ||
7232 | off = ubuf & ~PAGE_MASK; | |
7233 | size = iov.iov_len; | |
7234 | for (j = 0; j < nr_pages; j++) { | |
7235 | size_t vec_len; | |
7236 | ||
7237 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7238 | imu->bvec[j].bv_page = pages[j]; | |
7239 | imu->bvec[j].bv_len = vec_len; | |
7240 | imu->bvec[j].bv_offset = off; | |
7241 | off = 0; | |
7242 | size -= vec_len; | |
7243 | } | |
7244 | /* store original address for later verification */ | |
7245 | imu->ubuf = ubuf; | |
7246 | imu->len = iov.iov_len; | |
7247 | imu->nr_bvecs = nr_pages; | |
7248 | ||
7249 | ctx->nr_user_bufs++; | |
7250 | } | |
d4ef6475 MR |
7251 | kvfree(pages); |
7252 | kvfree(vmas); | |
edafccee JA |
7253 | return 0; |
7254 | err: | |
d4ef6475 MR |
7255 | kvfree(pages); |
7256 | kvfree(vmas); | |
edafccee JA |
7257 | io_sqe_buffer_unregister(ctx); |
7258 | return ret; | |
7259 | } | |
7260 | ||
9b402849 JA |
7261 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7262 | { | |
7263 | __s32 __user *fds = arg; | |
7264 | int fd; | |
7265 | ||
7266 | if (ctx->cq_ev_fd) | |
7267 | return -EBUSY; | |
7268 | ||
7269 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7270 | return -EFAULT; | |
7271 | ||
7272 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7273 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7274 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7275 | ctx->cq_ev_fd = NULL; | |
7276 | return ret; | |
7277 | } | |
7278 | ||
7279 | return 0; | |
7280 | } | |
7281 | ||
7282 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7283 | { | |
7284 | if (ctx->cq_ev_fd) { | |
7285 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7286 | ctx->cq_ev_fd = NULL; | |
7287 | return 0; | |
7288 | } | |
7289 | ||
7290 | return -ENXIO; | |
7291 | } | |
7292 | ||
5a2e745d JA |
7293 | static int __io_destroy_buffers(int id, void *p, void *data) |
7294 | { | |
7295 | struct io_ring_ctx *ctx = data; | |
7296 | struct io_buffer *buf = p; | |
7297 | ||
067524e9 | 7298 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7299 | return 0; |
7300 | } | |
7301 | ||
7302 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7303 | { | |
7304 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7305 | idr_destroy(&ctx->io_buffer_idr); | |
7306 | } | |
7307 | ||
2b188cc1 JA |
7308 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7309 | { | |
6b06314c | 7310 | io_finish_async(ctx); |
2b188cc1 JA |
7311 | if (ctx->sqo_mm) |
7312 | mmdrop(ctx->sqo_mm); | |
def596e9 JA |
7313 | |
7314 | io_iopoll_reap_events(ctx); | |
edafccee | 7315 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7316 | io_sqe_files_unregister(ctx); |
9b402849 | 7317 | io_eventfd_unregister(ctx); |
5a2e745d | 7318 | io_destroy_buffers(ctx); |
41726c9a | 7319 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7320 | |
2b188cc1 | 7321 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7322 | if (ctx->ring_sock) { |
7323 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7324 | sock_release(ctx->ring_sock); |
355e8d26 | 7325 | } |
2b188cc1 JA |
7326 | #endif |
7327 | ||
75b28aff | 7328 | io_mem_free(ctx->rings); |
2b188cc1 | 7329 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7330 | |
7331 | percpu_ref_exit(&ctx->refs); | |
7332 | if (ctx->account_mem) | |
7333 | io_unaccount_mem(ctx->user, | |
7334 | ring_pages(ctx->sq_entries, ctx->cq_entries)); | |
7335 | free_uid(ctx->user); | |
181e448d | 7336 | put_cred(ctx->creds); |
78076bb6 | 7337 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7338 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7339 | kfree(ctx); |
7340 | } | |
7341 | ||
7342 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7343 | { | |
7344 | struct io_ring_ctx *ctx = file->private_data; | |
7345 | __poll_t mask = 0; | |
7346 | ||
7347 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7348 | /* |
7349 | * synchronizes with barrier from wq_has_sleeper call in | |
7350 | * io_commit_cqring | |
7351 | */ | |
2b188cc1 | 7352 | smp_rmb(); |
75b28aff HV |
7353 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7354 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7355 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7356 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7357 | mask |= EPOLLIN | EPOLLRDNORM; |
7358 | ||
7359 | return mask; | |
7360 | } | |
7361 | ||
7362 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7363 | { | |
7364 | struct io_ring_ctx *ctx = file->private_data; | |
7365 | ||
7366 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7367 | } | |
7368 | ||
071698e1 JA |
7369 | static int io_remove_personalities(int id, void *p, void *data) |
7370 | { | |
7371 | struct io_ring_ctx *ctx = data; | |
7372 | const struct cred *cred; | |
7373 | ||
7374 | cred = idr_remove(&ctx->personality_idr, id); | |
7375 | if (cred) | |
7376 | put_cred(cred); | |
7377 | return 0; | |
7378 | } | |
7379 | ||
85faa7b8 JA |
7380 | static void io_ring_exit_work(struct work_struct *work) |
7381 | { | |
7382 | struct io_ring_ctx *ctx; | |
7383 | ||
7384 | ctx = container_of(work, struct io_ring_ctx, exit_work); | |
7385 | if (ctx->rings) | |
7386 | io_cqring_overflow_flush(ctx, true); | |
7387 | ||
0f158b4c | 7388 | wait_for_completion(&ctx->ref_comp); |
85faa7b8 JA |
7389 | io_ring_ctx_free(ctx); |
7390 | } | |
7391 | ||
2b188cc1 JA |
7392 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7393 | { | |
7394 | mutex_lock(&ctx->uring_lock); | |
7395 | percpu_ref_kill(&ctx->refs); | |
7396 | mutex_unlock(&ctx->uring_lock); | |
7397 | ||
5262f567 | 7398 | io_kill_timeouts(ctx); |
221c5eb2 | 7399 | io_poll_remove_all(ctx); |
561fb04a JA |
7400 | |
7401 | if (ctx->io_wq) | |
7402 | io_wq_cancel_all(ctx->io_wq); | |
7403 | ||
def596e9 | 7404 | io_iopoll_reap_events(ctx); |
15dff286 JA |
7405 | /* if we failed setting up the ctx, we might not have any rings */ |
7406 | if (ctx->rings) | |
7407 | io_cqring_overflow_flush(ctx, true); | |
071698e1 | 7408 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
85faa7b8 JA |
7409 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7410 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7411 | } |
7412 | ||
7413 | static int io_uring_release(struct inode *inode, struct file *file) | |
7414 | { | |
7415 | struct io_ring_ctx *ctx = file->private_data; | |
7416 | ||
7417 | file->private_data = NULL; | |
7418 | io_ring_ctx_wait_and_kill(ctx); | |
7419 | return 0; | |
7420 | } | |
7421 | ||
fcb323cc JA |
7422 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7423 | struct files_struct *files) | |
7424 | { | |
fcb323cc | 7425 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7426 | struct io_kiocb *cancel_req = NULL, *req; |
7427 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7428 | |
7429 | spin_lock_irq(&ctx->inflight_lock); | |
7430 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7431 | if (req->work.files != files) |
7432 | continue; | |
7433 | /* req is being completed, ignore */ | |
7434 | if (!refcount_inc_not_zero(&req->refs)) | |
7435 | continue; | |
7436 | cancel_req = req; | |
7437 | break; | |
fcb323cc | 7438 | } |
768134d4 | 7439 | if (cancel_req) |
fcb323cc | 7440 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7441 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7442 | spin_unlock_irq(&ctx->inflight_lock); |
7443 | ||
768134d4 JA |
7444 | /* We need to keep going until we don't find a matching req */ |
7445 | if (!cancel_req) | |
fcb323cc | 7446 | break; |
2f6d9b9d | 7447 | |
2ca10259 JA |
7448 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7449 | spin_lock_irq(&ctx->completion_lock); | |
7450 | list_del(&cancel_req->list); | |
7451 | cancel_req->flags &= ~REQ_F_OVERFLOW; | |
7452 | if (list_empty(&ctx->cq_overflow_list)) { | |
7453 | clear_bit(0, &ctx->sq_check_overflow); | |
7454 | clear_bit(0, &ctx->cq_check_overflow); | |
7455 | } | |
7456 | spin_unlock_irq(&ctx->completion_lock); | |
7457 | ||
7458 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7459 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7460 | ||
7461 | /* | |
7462 | * Put inflight ref and overflow ref. If that's | |
7463 | * all we had, then we're done with this request. | |
7464 | */ | |
7465 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7466 | io_free_req(cancel_req); |
d8f1b971 | 7467 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7468 | continue; |
7469 | } | |
7b53d598 PB |
7470 | } else { |
7471 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7472 | io_put_req(cancel_req); | |
2ca10259 JA |
7473 | } |
7474 | ||
fcb323cc | 7475 | schedule(); |
d8f1b971 | 7476 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7477 | } |
7478 | } | |
7479 | ||
7480 | static int io_uring_flush(struct file *file, void *data) | |
7481 | { | |
7482 | struct io_ring_ctx *ctx = file->private_data; | |
7483 | ||
7484 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7485 | |
7486 | /* | |
7487 | * If the task is going away, cancel work it may have pending | |
7488 | */ | |
7489 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) | |
7490 | io_wq_cancel_pid(ctx->io_wq, task_pid_vnr(current)); | |
7491 | ||
fcb323cc JA |
7492 | return 0; |
7493 | } | |
7494 | ||
6c5c240e RP |
7495 | static void *io_uring_validate_mmap_request(struct file *file, |
7496 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7497 | { |
2b188cc1 | 7498 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7499 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7500 | struct page *page; |
7501 | void *ptr; | |
7502 | ||
7503 | switch (offset) { | |
7504 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7505 | case IORING_OFF_CQ_RING: |
7506 | ptr = ctx->rings; | |
2b188cc1 JA |
7507 | break; |
7508 | case IORING_OFF_SQES: | |
7509 | ptr = ctx->sq_sqes; | |
7510 | break; | |
2b188cc1 | 7511 | default: |
6c5c240e | 7512 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7513 | } |
7514 | ||
7515 | page = virt_to_head_page(ptr); | |
a50b854e | 7516 | if (sz > page_size(page)) |
6c5c240e RP |
7517 | return ERR_PTR(-EINVAL); |
7518 | ||
7519 | return ptr; | |
7520 | } | |
7521 | ||
7522 | #ifdef CONFIG_MMU | |
7523 | ||
7524 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7525 | { | |
7526 | size_t sz = vma->vm_end - vma->vm_start; | |
7527 | unsigned long pfn; | |
7528 | void *ptr; | |
7529 | ||
7530 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7531 | if (IS_ERR(ptr)) | |
7532 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7533 | |
7534 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7535 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7536 | } | |
7537 | ||
6c5c240e RP |
7538 | #else /* !CONFIG_MMU */ |
7539 | ||
7540 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7541 | { | |
7542 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7543 | } | |
7544 | ||
7545 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7546 | { | |
7547 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7548 | } | |
7549 | ||
7550 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7551 | unsigned long addr, unsigned long len, | |
7552 | unsigned long pgoff, unsigned long flags) | |
7553 | { | |
7554 | void *ptr; | |
7555 | ||
7556 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7557 | if (IS_ERR(ptr)) | |
7558 | return PTR_ERR(ptr); | |
7559 | ||
7560 | return (unsigned long) ptr; | |
7561 | } | |
7562 | ||
7563 | #endif /* !CONFIG_MMU */ | |
7564 | ||
2b188cc1 JA |
7565 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7566 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7567 | size_t, sigsz) | |
7568 | { | |
7569 | struct io_ring_ctx *ctx; | |
7570 | long ret = -EBADF; | |
7571 | int submitted = 0; | |
7572 | struct fd f; | |
7573 | ||
b41e9852 JA |
7574 | if (current->task_works) |
7575 | task_work_run(); | |
7576 | ||
6c271ce2 | 7577 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7578 | return -EINVAL; |
7579 | ||
7580 | f = fdget(fd); | |
7581 | if (!f.file) | |
7582 | return -EBADF; | |
7583 | ||
7584 | ret = -EOPNOTSUPP; | |
7585 | if (f.file->f_op != &io_uring_fops) | |
7586 | goto out_fput; | |
7587 | ||
7588 | ret = -ENXIO; | |
7589 | ctx = f.file->private_data; | |
7590 | if (!percpu_ref_tryget(&ctx->refs)) | |
7591 | goto out_fput; | |
7592 | ||
6c271ce2 JA |
7593 | /* |
7594 | * For SQ polling, the thread will do all submissions and completions. | |
7595 | * Just return the requested submit count, and wake the thread if | |
7596 | * we were asked to. | |
7597 | */ | |
b2a9eada | 7598 | ret = 0; |
6c271ce2 | 7599 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
7600 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
7601 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
7602 | if (flags & IORING_ENTER_SQ_WAKEUP) |
7603 | wake_up(&ctx->sqo_wait); | |
7604 | submitted = to_submit; | |
b2a9eada | 7605 | } else if (to_submit) { |
2b188cc1 | 7606 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 7607 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 7608 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
7609 | |
7610 | if (submitted != to_submit) | |
7611 | goto out; | |
2b188cc1 JA |
7612 | } |
7613 | if (flags & IORING_ENTER_GETEVENTS) { | |
def596e9 JA |
7614 | unsigned nr_events = 0; |
7615 | ||
2b188cc1 JA |
7616 | min_complete = min(min_complete, ctx->cq_entries); |
7617 | ||
32b2244a XW |
7618 | /* |
7619 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
7620 | * space applications don't need to do io completion events | |
7621 | * polling again, they can rely on io_sq_thread to do polling | |
7622 | * work, which can reduce cpu usage and uring_lock contention. | |
7623 | */ | |
7624 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
7625 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
def596e9 | 7626 | ret = io_iopoll_check(ctx, &nr_events, min_complete); |
def596e9 JA |
7627 | } else { |
7628 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
7629 | } | |
2b188cc1 JA |
7630 | } |
7631 | ||
7c504e65 | 7632 | out: |
6805b32e | 7633 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
7634 | out_fput: |
7635 | fdput(f); | |
7636 | return submitted ? submitted : ret; | |
7637 | } | |
7638 | ||
bebdb65e | 7639 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
7640 | static int io_uring_show_cred(int id, void *p, void *data) |
7641 | { | |
7642 | const struct cred *cred = p; | |
7643 | struct seq_file *m = data; | |
7644 | struct user_namespace *uns = seq_user_ns(m); | |
7645 | struct group_info *gi; | |
7646 | kernel_cap_t cap; | |
7647 | unsigned __capi; | |
7648 | int g; | |
7649 | ||
7650 | seq_printf(m, "%5d\n", id); | |
7651 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
7652 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
7653 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
7654 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
7655 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
7656 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
7657 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
7658 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
7659 | seq_puts(m, "\n\tGroups:\t"); | |
7660 | gi = cred->group_info; | |
7661 | for (g = 0; g < gi->ngroups; g++) { | |
7662 | seq_put_decimal_ull(m, g ? " " : "", | |
7663 | from_kgid_munged(uns, gi->gid[g])); | |
7664 | } | |
7665 | seq_puts(m, "\n\tCapEff:\t"); | |
7666 | cap = cred->cap_effective; | |
7667 | CAP_FOR_EACH_U32(__capi) | |
7668 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
7669 | seq_putc(m, '\n'); | |
7670 | return 0; | |
7671 | } | |
7672 | ||
7673 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
7674 | { | |
7675 | int i; | |
7676 | ||
7677 | mutex_lock(&ctx->uring_lock); | |
7678 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
7679 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7680 | struct fixed_file_table *table; | |
7681 | struct file *f; | |
7682 | ||
7683 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7684 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
7685 | if (f) | |
7686 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
7687 | else | |
7688 | seq_printf(m, "%5u: <none>\n", i); | |
7689 | } | |
7690 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
7691 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7692 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
7693 | ||
7694 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
7695 | (unsigned int) buf->len); | |
7696 | } | |
7697 | if (!idr_is_empty(&ctx->personality_idr)) { | |
7698 | seq_printf(m, "Personalities:\n"); | |
7699 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
7700 | } | |
d7718a9d JA |
7701 | seq_printf(m, "PollList:\n"); |
7702 | spin_lock_irq(&ctx->completion_lock); | |
7703 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7704 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
7705 | struct io_kiocb *req; | |
7706 | ||
7707 | hlist_for_each_entry(req, list, hash_node) | |
7708 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7709 | req->task->task_works != NULL); | |
7710 | } | |
7711 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
7712 | mutex_unlock(&ctx->uring_lock); |
7713 | } | |
7714 | ||
7715 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
7716 | { | |
7717 | struct io_ring_ctx *ctx = f->private_data; | |
7718 | ||
7719 | if (percpu_ref_tryget(&ctx->refs)) { | |
7720 | __io_uring_show_fdinfo(ctx, m); | |
7721 | percpu_ref_put(&ctx->refs); | |
7722 | } | |
7723 | } | |
bebdb65e | 7724 | #endif |
87ce955b | 7725 | |
2b188cc1 JA |
7726 | static const struct file_operations io_uring_fops = { |
7727 | .release = io_uring_release, | |
fcb323cc | 7728 | .flush = io_uring_flush, |
2b188cc1 | 7729 | .mmap = io_uring_mmap, |
6c5c240e RP |
7730 | #ifndef CONFIG_MMU |
7731 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
7732 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
7733 | #endif | |
2b188cc1 JA |
7734 | .poll = io_uring_poll, |
7735 | .fasync = io_uring_fasync, | |
bebdb65e | 7736 | #ifdef CONFIG_PROC_FS |
87ce955b | 7737 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 7738 | #endif |
2b188cc1 JA |
7739 | }; |
7740 | ||
7741 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
7742 | struct io_uring_params *p) | |
7743 | { | |
75b28aff HV |
7744 | struct io_rings *rings; |
7745 | size_t size, sq_array_offset; | |
2b188cc1 | 7746 | |
75b28aff HV |
7747 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
7748 | if (size == SIZE_MAX) | |
7749 | return -EOVERFLOW; | |
7750 | ||
7751 | rings = io_mem_alloc(size); | |
7752 | if (!rings) | |
2b188cc1 JA |
7753 | return -ENOMEM; |
7754 | ||
75b28aff HV |
7755 | ctx->rings = rings; |
7756 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
7757 | rings->sq_ring_mask = p->sq_entries - 1; | |
7758 | rings->cq_ring_mask = p->cq_entries - 1; | |
7759 | rings->sq_ring_entries = p->sq_entries; | |
7760 | rings->cq_ring_entries = p->cq_entries; | |
7761 | ctx->sq_mask = rings->sq_ring_mask; | |
7762 | ctx->cq_mask = rings->cq_ring_mask; | |
7763 | ctx->sq_entries = rings->sq_ring_entries; | |
7764 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
7765 | |
7766 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
7767 | if (size == SIZE_MAX) { |
7768 | io_mem_free(ctx->rings); | |
7769 | ctx->rings = NULL; | |
2b188cc1 | 7770 | return -EOVERFLOW; |
eb065d30 | 7771 | } |
2b188cc1 JA |
7772 | |
7773 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
7774 | if (!ctx->sq_sqes) { |
7775 | io_mem_free(ctx->rings); | |
7776 | ctx->rings = NULL; | |
2b188cc1 | 7777 | return -ENOMEM; |
eb065d30 | 7778 | } |
2b188cc1 | 7779 | |
2b188cc1 JA |
7780 | return 0; |
7781 | } | |
7782 | ||
7783 | /* | |
7784 | * Allocate an anonymous fd, this is what constitutes the application | |
7785 | * visible backing of an io_uring instance. The application mmaps this | |
7786 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
7787 | * we have to tie this fd to a socket for file garbage collection purposes. | |
7788 | */ | |
7789 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
7790 | { | |
7791 | struct file *file; | |
7792 | int ret; | |
7793 | ||
7794 | #if defined(CONFIG_UNIX) | |
7795 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
7796 | &ctx->ring_sock); | |
7797 | if (ret) | |
7798 | return ret; | |
7799 | #endif | |
7800 | ||
7801 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
7802 | if (ret < 0) | |
7803 | goto err; | |
7804 | ||
7805 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
7806 | O_RDWR | O_CLOEXEC); | |
7807 | if (IS_ERR(file)) { | |
7808 | put_unused_fd(ret); | |
7809 | ret = PTR_ERR(file); | |
7810 | goto err; | |
7811 | } | |
7812 | ||
7813 | #if defined(CONFIG_UNIX) | |
7814 | ctx->ring_sock->file = file; | |
7815 | #endif | |
7816 | fd_install(ret, file); | |
7817 | return ret; | |
7818 | err: | |
7819 | #if defined(CONFIG_UNIX) | |
7820 | sock_release(ctx->ring_sock); | |
7821 | ctx->ring_sock = NULL; | |
7822 | #endif | |
7823 | return ret; | |
7824 | } | |
7825 | ||
7f13657d XW |
7826 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
7827 | struct io_uring_params __user *params) | |
2b188cc1 JA |
7828 | { |
7829 | struct user_struct *user = NULL; | |
7830 | struct io_ring_ctx *ctx; | |
7831 | bool account_mem; | |
7832 | int ret; | |
7833 | ||
8110c1a6 | 7834 | if (!entries) |
2b188cc1 | 7835 | return -EINVAL; |
8110c1a6 JA |
7836 | if (entries > IORING_MAX_ENTRIES) { |
7837 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7838 | return -EINVAL; | |
7839 | entries = IORING_MAX_ENTRIES; | |
7840 | } | |
2b188cc1 JA |
7841 | |
7842 | /* | |
7843 | * Use twice as many entries for the CQ ring. It's possible for the | |
7844 | * application to drive a higher depth than the size of the SQ ring, | |
7845 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
7846 | * some flexibility in overcommitting a bit. If the application has |
7847 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
7848 | * of CQ ring entries manually. | |
2b188cc1 JA |
7849 | */ |
7850 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
7851 | if (p->flags & IORING_SETUP_CQSIZE) { |
7852 | /* | |
7853 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
7854 | * to a power-of-two, if it isn't already. We do NOT impose | |
7855 | * any cq vs sq ring sizing. | |
7856 | */ | |
8110c1a6 | 7857 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 7858 | return -EINVAL; |
8110c1a6 JA |
7859 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
7860 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7861 | return -EINVAL; | |
7862 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
7863 | } | |
33a107f0 JA |
7864 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
7865 | } else { | |
7866 | p->cq_entries = 2 * p->sq_entries; | |
7867 | } | |
2b188cc1 JA |
7868 | |
7869 | user = get_uid(current_user()); | |
7870 | account_mem = !capable(CAP_IPC_LOCK); | |
7871 | ||
7872 | if (account_mem) { | |
7873 | ret = io_account_mem(user, | |
7874 | ring_pages(p->sq_entries, p->cq_entries)); | |
7875 | if (ret) { | |
7876 | free_uid(user); | |
7877 | return ret; | |
7878 | } | |
7879 | } | |
7880 | ||
7881 | ctx = io_ring_ctx_alloc(p); | |
7882 | if (!ctx) { | |
7883 | if (account_mem) | |
7884 | io_unaccount_mem(user, ring_pages(p->sq_entries, | |
7885 | p->cq_entries)); | |
7886 | free_uid(user); | |
7887 | return -ENOMEM; | |
7888 | } | |
7889 | ctx->compat = in_compat_syscall(); | |
7890 | ctx->account_mem = account_mem; | |
7891 | ctx->user = user; | |
0b8c0ec7 | 7892 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
7893 | |
7894 | ret = io_allocate_scq_urings(ctx, p); | |
7895 | if (ret) | |
7896 | goto err; | |
7897 | ||
6c271ce2 | 7898 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
7899 | if (ret) |
7900 | goto err; | |
7901 | ||
2b188cc1 | 7902 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
7903 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
7904 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
7905 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
7906 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
7907 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
7908 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
7909 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
7910 | |
7911 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
7912 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
7913 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
7914 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
7915 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
7916 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
7917 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 7918 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 7919 | |
7f13657d XW |
7920 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
7921 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
7922 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; | |
7923 | ||
7924 | if (copy_to_user(params, p, sizeof(*p))) { | |
7925 | ret = -EFAULT; | |
7926 | goto err; | |
7927 | } | |
044c1ab3 JA |
7928 | /* |
7929 | * Install ring fd as the very last thing, so we don't risk someone | |
7930 | * having closed it before we finish setup | |
7931 | */ | |
7932 | ret = io_uring_get_fd(ctx); | |
7933 | if (ret < 0) | |
7934 | goto err; | |
7935 | ||
c826bd7a | 7936 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
7937 | return ret; |
7938 | err: | |
7939 | io_ring_ctx_wait_and_kill(ctx); | |
7940 | return ret; | |
7941 | } | |
7942 | ||
7943 | /* | |
7944 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
7945 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
7946 | * params structure passed in. | |
7947 | */ | |
7948 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
7949 | { | |
7950 | struct io_uring_params p; | |
2b188cc1 JA |
7951 | int i; |
7952 | ||
7953 | if (copy_from_user(&p, params, sizeof(p))) | |
7954 | return -EFAULT; | |
7955 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
7956 | if (p.resv[i]) | |
7957 | return -EINVAL; | |
7958 | } | |
7959 | ||
6c271ce2 | 7960 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 7961 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 7962 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
7963 | return -EINVAL; |
7964 | ||
7f13657d | 7965 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
7966 | } |
7967 | ||
7968 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
7969 | struct io_uring_params __user *, params) | |
7970 | { | |
7971 | return io_uring_setup(entries, params); | |
7972 | } | |
7973 | ||
66f4af93 JA |
7974 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
7975 | { | |
7976 | struct io_uring_probe *p; | |
7977 | size_t size; | |
7978 | int i, ret; | |
7979 | ||
7980 | size = struct_size(p, ops, nr_args); | |
7981 | if (size == SIZE_MAX) | |
7982 | return -EOVERFLOW; | |
7983 | p = kzalloc(size, GFP_KERNEL); | |
7984 | if (!p) | |
7985 | return -ENOMEM; | |
7986 | ||
7987 | ret = -EFAULT; | |
7988 | if (copy_from_user(p, arg, size)) | |
7989 | goto out; | |
7990 | ret = -EINVAL; | |
7991 | if (memchr_inv(p, 0, size)) | |
7992 | goto out; | |
7993 | ||
7994 | p->last_op = IORING_OP_LAST - 1; | |
7995 | if (nr_args > IORING_OP_LAST) | |
7996 | nr_args = IORING_OP_LAST; | |
7997 | ||
7998 | for (i = 0; i < nr_args; i++) { | |
7999 | p->ops[i].op = i; | |
8000 | if (!io_op_defs[i].not_supported) | |
8001 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8002 | } | |
8003 | p->ops_len = i; | |
8004 | ||
8005 | ret = 0; | |
8006 | if (copy_to_user(arg, p, size)) | |
8007 | ret = -EFAULT; | |
8008 | out: | |
8009 | kfree(p); | |
8010 | return ret; | |
8011 | } | |
8012 | ||
071698e1 JA |
8013 | static int io_register_personality(struct io_ring_ctx *ctx) |
8014 | { | |
8015 | const struct cred *creds = get_current_cred(); | |
8016 | int id; | |
8017 | ||
8018 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8019 | USHRT_MAX, GFP_KERNEL); | |
8020 | if (id < 0) | |
8021 | put_cred(creds); | |
8022 | return id; | |
8023 | } | |
8024 | ||
8025 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8026 | { | |
8027 | const struct cred *old_creds; | |
8028 | ||
8029 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8030 | if (old_creds) { | |
8031 | put_cred(old_creds); | |
8032 | return 0; | |
8033 | } | |
8034 | ||
8035 | return -EINVAL; | |
8036 | } | |
8037 | ||
8038 | static bool io_register_op_must_quiesce(int op) | |
8039 | { | |
8040 | switch (op) { | |
8041 | case IORING_UNREGISTER_FILES: | |
8042 | case IORING_REGISTER_FILES_UPDATE: | |
8043 | case IORING_REGISTER_PROBE: | |
8044 | case IORING_REGISTER_PERSONALITY: | |
8045 | case IORING_UNREGISTER_PERSONALITY: | |
8046 | return false; | |
8047 | default: | |
8048 | return true; | |
8049 | } | |
8050 | } | |
8051 | ||
edafccee JA |
8052 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8053 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8054 | __releases(ctx->uring_lock) |
8055 | __acquires(ctx->uring_lock) | |
edafccee JA |
8056 | { |
8057 | int ret; | |
8058 | ||
35fa71a0 JA |
8059 | /* |
8060 | * We're inside the ring mutex, if the ref is already dying, then | |
8061 | * someone else killed the ctx or is already going through | |
8062 | * io_uring_register(). | |
8063 | */ | |
8064 | if (percpu_ref_is_dying(&ctx->refs)) | |
8065 | return -ENXIO; | |
8066 | ||
071698e1 | 8067 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8068 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8069 | |
05f3fb3c JA |
8070 | /* |
8071 | * Drop uring mutex before waiting for references to exit. If | |
8072 | * another thread is currently inside io_uring_enter() it might | |
8073 | * need to grab the uring_lock to make progress. If we hold it | |
8074 | * here across the drain wait, then we can deadlock. It's safe | |
8075 | * to drop the mutex here, since no new references will come in | |
8076 | * after we've killed the percpu ref. | |
8077 | */ | |
8078 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8079 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8080 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8081 | if (ret) { |
8082 | percpu_ref_resurrect(&ctx->refs); | |
8083 | ret = -EINTR; | |
8084 | goto out; | |
8085 | } | |
05f3fb3c | 8086 | } |
edafccee JA |
8087 | |
8088 | switch (opcode) { | |
8089 | case IORING_REGISTER_BUFFERS: | |
8090 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8091 | break; | |
8092 | case IORING_UNREGISTER_BUFFERS: | |
8093 | ret = -EINVAL; | |
8094 | if (arg || nr_args) | |
8095 | break; | |
8096 | ret = io_sqe_buffer_unregister(ctx); | |
8097 | break; | |
6b06314c JA |
8098 | case IORING_REGISTER_FILES: |
8099 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8100 | break; | |
8101 | case IORING_UNREGISTER_FILES: | |
8102 | ret = -EINVAL; | |
8103 | if (arg || nr_args) | |
8104 | break; | |
8105 | ret = io_sqe_files_unregister(ctx); | |
8106 | break; | |
c3a31e60 JA |
8107 | case IORING_REGISTER_FILES_UPDATE: |
8108 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8109 | break; | |
9b402849 | 8110 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8111 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8112 | ret = -EINVAL; |
8113 | if (nr_args != 1) | |
8114 | break; | |
8115 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8116 | if (ret) |
8117 | break; | |
8118 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8119 | ctx->eventfd_async = 1; | |
8120 | else | |
8121 | ctx->eventfd_async = 0; | |
9b402849 JA |
8122 | break; |
8123 | case IORING_UNREGISTER_EVENTFD: | |
8124 | ret = -EINVAL; | |
8125 | if (arg || nr_args) | |
8126 | break; | |
8127 | ret = io_eventfd_unregister(ctx); | |
8128 | break; | |
66f4af93 JA |
8129 | case IORING_REGISTER_PROBE: |
8130 | ret = -EINVAL; | |
8131 | if (!arg || nr_args > 256) | |
8132 | break; | |
8133 | ret = io_probe(ctx, arg, nr_args); | |
8134 | break; | |
071698e1 JA |
8135 | case IORING_REGISTER_PERSONALITY: |
8136 | ret = -EINVAL; | |
8137 | if (arg || nr_args) | |
8138 | break; | |
8139 | ret = io_register_personality(ctx); | |
8140 | break; | |
8141 | case IORING_UNREGISTER_PERSONALITY: | |
8142 | ret = -EINVAL; | |
8143 | if (arg) | |
8144 | break; | |
8145 | ret = io_unregister_personality(ctx, nr_args); | |
8146 | break; | |
edafccee JA |
8147 | default: |
8148 | ret = -EINVAL; | |
8149 | break; | |
8150 | } | |
8151 | ||
071698e1 | 8152 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8153 | /* bring the ctx back to life */ |
05f3fb3c | 8154 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8155 | out: |
0f158b4c | 8156 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8157 | } |
edafccee JA |
8158 | return ret; |
8159 | } | |
8160 | ||
8161 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8162 | void __user *, arg, unsigned int, nr_args) | |
8163 | { | |
8164 | struct io_ring_ctx *ctx; | |
8165 | long ret = -EBADF; | |
8166 | struct fd f; | |
8167 | ||
8168 | f = fdget(fd); | |
8169 | if (!f.file) | |
8170 | return -EBADF; | |
8171 | ||
8172 | ret = -EOPNOTSUPP; | |
8173 | if (f.file->f_op != &io_uring_fops) | |
8174 | goto out_fput; | |
8175 | ||
8176 | ctx = f.file->private_data; | |
8177 | ||
8178 | mutex_lock(&ctx->uring_lock); | |
8179 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8180 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8181 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8182 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8183 | out_fput: |
8184 | fdput(f); | |
8185 | return ret; | |
8186 | } | |
8187 | ||
2b188cc1 JA |
8188 | static int __init io_uring_init(void) |
8189 | { | |
d7f62e82 SM |
8190 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8191 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8192 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8193 | } while (0) | |
8194 | ||
8195 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8196 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8197 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8198 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8199 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8200 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8201 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8202 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8203 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8204 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8205 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8206 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8207 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8208 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8209 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8210 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
8211 | BUILD_BUG_SQE_ELEM(28, __u16, poll_events); | |
8212 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); | |
8213 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8214 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8215 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8216 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8217 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8218 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8219 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8220 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8221 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8222 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8223 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8224 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8225 | |
d3656344 | 8226 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8227 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8228 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8229 | return 0; | |
8230 | }; | |
8231 | __initcall(io_uring_init); |