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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 SB |
144 | /* |
145 | * Runtime flags | |
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; |
1e84b97b SB |
154 | /* |
155 | * Number of completion events lost because the queue was full; | |
156 | * this should be avoided by the application by making sure | |
0b4295b5 | 157 | * there are not more requests pending than there is space in |
1e84b97b SB |
158 | * the completion queue. |
159 | * | |
160 | * Written by the kernel, shouldn't be modified by the | |
161 | * application (i.e. get number of "new events" by comparing to | |
162 | * cached value). | |
163 | * | |
164 | * As completion events come in out of order this counter is not | |
165 | * ordered with any other data. | |
166 | */ | |
75b28aff | 167 | u32 cq_overflow; |
1e84b97b SB |
168 | /* |
169 | * Ring buffer of completion events. | |
170 | * | |
171 | * The kernel writes completion events fresh every time they are | |
172 | * produced, so the application is allowed to modify pending | |
173 | * entries. | |
174 | */ | |
75b28aff | 175 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
176 | }; |
177 | ||
edafccee JA |
178 | struct io_mapped_ubuf { |
179 | u64 ubuf; | |
180 | size_t len; | |
181 | struct bio_vec *bvec; | |
182 | unsigned int nr_bvecs; | |
183 | }; | |
184 | ||
65e19f54 JA |
185 | struct fixed_file_table { |
186 | struct file **files; | |
31b51510 JA |
187 | }; |
188 | ||
05589553 XW |
189 | struct fixed_file_ref_node { |
190 | struct percpu_ref refs; | |
191 | struct list_head node; | |
192 | struct list_head file_list; | |
193 | struct fixed_file_data *file_data; | |
194 | struct work_struct work; | |
195 | }; | |
196 | ||
05f3fb3c JA |
197 | struct fixed_file_data { |
198 | struct fixed_file_table *table; | |
199 | struct io_ring_ctx *ctx; | |
200 | ||
05589553 | 201 | struct percpu_ref *cur_refs; |
05f3fb3c | 202 | struct percpu_ref refs; |
05f3fb3c | 203 | struct completion done; |
05589553 XW |
204 | struct list_head ref_list; |
205 | spinlock_t lock; | |
05f3fb3c JA |
206 | }; |
207 | ||
5a2e745d JA |
208 | struct io_buffer { |
209 | struct list_head list; | |
210 | __u64 addr; | |
211 | __s32 len; | |
212 | __u16 bid; | |
213 | }; | |
214 | ||
2b188cc1 JA |
215 | struct io_ring_ctx { |
216 | struct { | |
217 | struct percpu_ref refs; | |
218 | } ____cacheline_aligned_in_smp; | |
219 | ||
220 | struct { | |
221 | unsigned int flags; | |
e1d85334 RD |
222 | unsigned int compat: 1; |
223 | unsigned int account_mem: 1; | |
224 | unsigned int cq_overflow_flushed: 1; | |
225 | unsigned int drain_next: 1; | |
226 | unsigned int eventfd_async: 1; | |
2b188cc1 | 227 | |
75b28aff HV |
228 | /* |
229 | * Ring buffer of indices into array of io_uring_sqe, which is | |
230 | * mmapped by the application using the IORING_OFF_SQES offset. | |
231 | * | |
232 | * This indirection could e.g. be used to assign fixed | |
233 | * io_uring_sqe entries to operations and only submit them to | |
234 | * the queue when needed. | |
235 | * | |
236 | * The kernel modifies neither the indices array nor the entries | |
237 | * array. | |
238 | */ | |
239 | u32 *sq_array; | |
2b188cc1 JA |
240 | unsigned cached_sq_head; |
241 | unsigned sq_entries; | |
242 | unsigned sq_mask; | |
6c271ce2 | 243 | unsigned sq_thread_idle; |
498ccd9e | 244 | unsigned cached_sq_dropped; |
206aefde | 245 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 246 | unsigned long sq_check_overflow; |
de0617e4 JA |
247 | |
248 | struct list_head defer_list; | |
5262f567 | 249 | struct list_head timeout_list; |
1d7bb1d5 | 250 | struct list_head cq_overflow_list; |
fcb323cc JA |
251 | |
252 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 253 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
254 | } ____cacheline_aligned_in_smp; |
255 | ||
206aefde JA |
256 | struct io_rings *rings; |
257 | ||
2b188cc1 | 258 | /* IO offload */ |
561fb04a | 259 | struct io_wq *io_wq; |
6c271ce2 | 260 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2b188cc1 | 261 | struct mm_struct *sqo_mm; |
6c271ce2 | 262 | wait_queue_head_t sqo_wait; |
75b28aff | 263 | |
6b06314c JA |
264 | /* |
265 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
266 | * readers must ensure that ->refs is alive as long as the file* is | |
267 | * used. Only updated through io_uring_register(2). | |
268 | */ | |
05f3fb3c | 269 | struct fixed_file_data *file_data; |
6b06314c | 270 | unsigned nr_user_files; |
b14cca0c PB |
271 | int ring_fd; |
272 | struct file *ring_file; | |
6b06314c | 273 | |
edafccee JA |
274 | /* if used, fixed mapped user buffers */ |
275 | unsigned nr_user_bufs; | |
276 | struct io_mapped_ubuf *user_bufs; | |
277 | ||
2b188cc1 JA |
278 | struct user_struct *user; |
279 | ||
0b8c0ec7 | 280 | const struct cred *creds; |
181e448d | 281 | |
206aefde JA |
282 | /* 0 is for ctx quiesce/reinit/free, 1 is for sqo_thread started */ |
283 | struct completion *completions; | |
284 | ||
0ddf92e8 JA |
285 | /* if all else fails... */ |
286 | struct io_kiocb *fallback_req; | |
287 | ||
206aefde JA |
288 | #if defined(CONFIG_UNIX) |
289 | struct socket *ring_sock; | |
290 | #endif | |
291 | ||
5a2e745d JA |
292 | struct idr io_buffer_idr; |
293 | ||
071698e1 JA |
294 | struct idr personality_idr; |
295 | ||
206aefde JA |
296 | struct { |
297 | unsigned cached_cq_tail; | |
298 | unsigned cq_entries; | |
299 | unsigned cq_mask; | |
300 | atomic_t cq_timeouts; | |
ad3eb2c8 | 301 | unsigned long cq_check_overflow; |
206aefde JA |
302 | struct wait_queue_head cq_wait; |
303 | struct fasync_struct *cq_fasync; | |
304 | struct eventfd_ctx *cq_ev_fd; | |
305 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
306 | |
307 | struct { | |
308 | struct mutex uring_lock; | |
309 | wait_queue_head_t wait; | |
310 | } ____cacheline_aligned_in_smp; | |
311 | ||
312 | struct { | |
313 | spinlock_t completion_lock; | |
e94f141b | 314 | |
def596e9 JA |
315 | /* |
316 | * ->poll_list is protected by the ctx->uring_lock for | |
317 | * io_uring instances that don't use IORING_SETUP_SQPOLL. | |
318 | * For SQPOLL, only the single threaded io_sq_thread() will | |
319 | * manipulate the list, hence no extra locking is needed there. | |
320 | */ | |
321 | struct list_head poll_list; | |
78076bb6 JA |
322 | struct hlist_head *cancel_hash; |
323 | unsigned cancel_hash_bits; | |
e94f141b | 324 | bool poll_multi_file; |
31b51510 | 325 | |
fcb323cc JA |
326 | spinlock_t inflight_lock; |
327 | struct list_head inflight_list; | |
2b188cc1 | 328 | } ____cacheline_aligned_in_smp; |
2b188cc1 JA |
329 | }; |
330 | ||
09bb8394 JA |
331 | /* |
332 | * First field must be the file pointer in all the | |
333 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
334 | */ | |
221c5eb2 JA |
335 | struct io_poll_iocb { |
336 | struct file *file; | |
0969e783 JA |
337 | union { |
338 | struct wait_queue_head *head; | |
339 | u64 addr; | |
340 | }; | |
221c5eb2 | 341 | __poll_t events; |
8c838788 | 342 | bool done; |
221c5eb2 | 343 | bool canceled; |
392edb45 | 344 | struct wait_queue_entry wait; |
221c5eb2 JA |
345 | }; |
346 | ||
b5dba59e JA |
347 | struct io_close { |
348 | struct file *file; | |
349 | struct file *put_file; | |
350 | int fd; | |
351 | }; | |
352 | ||
ad8a48ac JA |
353 | struct io_timeout_data { |
354 | struct io_kiocb *req; | |
355 | struct hrtimer timer; | |
356 | struct timespec64 ts; | |
357 | enum hrtimer_mode mode; | |
cc42e0ac | 358 | u32 seq_offset; |
ad8a48ac JA |
359 | }; |
360 | ||
8ed8d3c3 JA |
361 | struct io_accept { |
362 | struct file *file; | |
363 | struct sockaddr __user *addr; | |
364 | int __user *addr_len; | |
365 | int flags; | |
09952e3e | 366 | unsigned long nofile; |
8ed8d3c3 JA |
367 | }; |
368 | ||
369 | struct io_sync { | |
370 | struct file *file; | |
371 | loff_t len; | |
372 | loff_t off; | |
373 | int flags; | |
d63d1b5e | 374 | int mode; |
8ed8d3c3 JA |
375 | }; |
376 | ||
fbf23849 JA |
377 | struct io_cancel { |
378 | struct file *file; | |
379 | u64 addr; | |
380 | }; | |
381 | ||
b29472ee JA |
382 | struct io_timeout { |
383 | struct file *file; | |
384 | u64 addr; | |
385 | int flags; | |
26a61679 | 386 | unsigned count; |
b29472ee JA |
387 | }; |
388 | ||
9adbd45d JA |
389 | struct io_rw { |
390 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
391 | struct kiocb kiocb; | |
392 | u64 addr; | |
393 | u64 len; | |
394 | }; | |
395 | ||
3fbb51c1 JA |
396 | struct io_connect { |
397 | struct file *file; | |
398 | struct sockaddr __user *addr; | |
399 | int addr_len; | |
400 | }; | |
401 | ||
e47293fd JA |
402 | struct io_sr_msg { |
403 | struct file *file; | |
fddaface JA |
404 | union { |
405 | struct user_msghdr __user *msg; | |
406 | void __user *buf; | |
407 | }; | |
e47293fd | 408 | int msg_flags; |
bcda7baa | 409 | int bgid; |
fddaface | 410 | size_t len; |
bcda7baa | 411 | struct io_buffer *kbuf; |
e47293fd JA |
412 | }; |
413 | ||
15b71abe JA |
414 | struct io_open { |
415 | struct file *file; | |
416 | int dfd; | |
eddc7ef5 | 417 | union { |
eddc7ef5 JA |
418 | unsigned mask; |
419 | }; | |
15b71abe | 420 | struct filename *filename; |
eddc7ef5 | 421 | struct statx __user *buffer; |
c12cedf2 | 422 | struct open_how how; |
4022e7af | 423 | unsigned long nofile; |
15b71abe JA |
424 | }; |
425 | ||
05f3fb3c JA |
426 | struct io_files_update { |
427 | struct file *file; | |
428 | u64 arg; | |
429 | u32 nr_args; | |
430 | u32 offset; | |
431 | }; | |
432 | ||
4840e418 JA |
433 | struct io_fadvise { |
434 | struct file *file; | |
435 | u64 offset; | |
436 | u32 len; | |
437 | u32 advice; | |
438 | }; | |
439 | ||
c1ca757b JA |
440 | struct io_madvise { |
441 | struct file *file; | |
442 | u64 addr; | |
443 | u32 len; | |
444 | u32 advice; | |
445 | }; | |
446 | ||
3e4827b0 JA |
447 | struct io_epoll { |
448 | struct file *file; | |
449 | int epfd; | |
450 | int op; | |
451 | int fd; | |
452 | struct epoll_event event; | |
e47293fd JA |
453 | }; |
454 | ||
7d67af2c PB |
455 | struct io_splice { |
456 | struct file *file_out; | |
457 | struct file *file_in; | |
458 | loff_t off_out; | |
459 | loff_t off_in; | |
460 | u64 len; | |
461 | unsigned int flags; | |
462 | }; | |
463 | ||
ddf0322d JA |
464 | struct io_provide_buf { |
465 | struct file *file; | |
466 | __u64 addr; | |
467 | __s32 len; | |
468 | __u32 bgid; | |
469 | __u16 nbufs; | |
470 | __u16 bid; | |
471 | }; | |
472 | ||
f499a021 JA |
473 | struct io_async_connect { |
474 | struct sockaddr_storage address; | |
475 | }; | |
476 | ||
03b1230c JA |
477 | struct io_async_msghdr { |
478 | struct iovec fast_iov[UIO_FASTIOV]; | |
479 | struct iovec *iov; | |
480 | struct sockaddr __user *uaddr; | |
481 | struct msghdr msg; | |
b537916c | 482 | struct sockaddr_storage addr; |
03b1230c JA |
483 | }; |
484 | ||
f67676d1 JA |
485 | struct io_async_rw { |
486 | struct iovec fast_iov[UIO_FASTIOV]; | |
487 | struct iovec *iov; | |
488 | ssize_t nr_segs; | |
489 | ssize_t size; | |
490 | }; | |
491 | ||
1a6b74fc | 492 | struct io_async_ctx { |
f67676d1 JA |
493 | union { |
494 | struct io_async_rw rw; | |
03b1230c | 495 | struct io_async_msghdr msg; |
f499a021 | 496 | struct io_async_connect connect; |
2d28390a | 497 | struct io_timeout_data timeout; |
f67676d1 | 498 | }; |
1a6b74fc JA |
499 | }; |
500 | ||
6b47ee6e PB |
501 | enum { |
502 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
503 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
504 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
505 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
506 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 507 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e PB |
508 | |
509 | REQ_F_LINK_NEXT_BIT, | |
510 | REQ_F_FAIL_LINK_BIT, | |
511 | REQ_F_INFLIGHT_BIT, | |
512 | REQ_F_CUR_POS_BIT, | |
513 | REQ_F_NOWAIT_BIT, | |
514 | REQ_F_IOPOLL_COMPLETED_BIT, | |
515 | REQ_F_LINK_TIMEOUT_BIT, | |
516 | REQ_F_TIMEOUT_BIT, | |
517 | REQ_F_ISREG_BIT, | |
518 | REQ_F_MUST_PUNT_BIT, | |
519 | REQ_F_TIMEOUT_NOSEQ_BIT, | |
520 | REQ_F_COMP_LOCKED_BIT, | |
99bc4c38 | 521 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 522 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 523 | REQ_F_POLLED_BIT, |
bcda7baa | 524 | REQ_F_BUFFER_SELECTED_BIT, |
84557871 JA |
525 | |
526 | /* not a real bit, just to check we're not overflowing the space */ | |
527 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
528 | }; |
529 | ||
530 | enum { | |
531 | /* ctx owns file */ | |
532 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
533 | /* drain existing IO first */ | |
534 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
535 | /* linked sqes */ | |
536 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
537 | /* doesn't sever on completion < 0 */ | |
538 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
539 | /* IOSQE_ASYNC */ | |
540 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
541 | /* IOSQE_BUFFER_SELECT */ |
542 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e PB |
543 | |
544 | /* already grabbed next link */ | |
545 | REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), | |
546 | /* fail rest of links */ | |
547 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
548 | /* on inflight list */ | |
549 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
550 | /* read/write uses file position */ | |
551 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
552 | /* must not punt to workers */ | |
553 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
554 | /* polled IO has completed */ | |
555 | REQ_F_IOPOLL_COMPLETED = BIT(REQ_F_IOPOLL_COMPLETED_BIT), | |
556 | /* has linked timeout */ | |
557 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
558 | /* timeout request */ | |
559 | REQ_F_TIMEOUT = BIT(REQ_F_TIMEOUT_BIT), | |
560 | /* regular file */ | |
561 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
562 | /* must be punted even for NONBLOCK */ | |
563 | REQ_F_MUST_PUNT = BIT(REQ_F_MUST_PUNT_BIT), | |
564 | /* no timeout sequence */ | |
565 | REQ_F_TIMEOUT_NOSEQ = BIT(REQ_F_TIMEOUT_NOSEQ_BIT), | |
566 | /* completion under lock */ | |
567 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
568 | /* needs cleanup */ |
569 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
570 | /* in overflow list */ |
571 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
572 | /* already went through poll handler */ |
573 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
574 | /* buffer already selected */ |
575 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
d7718a9d JA |
576 | }; |
577 | ||
578 | struct async_poll { | |
579 | struct io_poll_iocb poll; | |
580 | struct io_wq_work work; | |
6b47ee6e PB |
581 | }; |
582 | ||
09bb8394 JA |
583 | /* |
584 | * NOTE! Each of the iocb union members has the file pointer | |
585 | * as the first entry in their struct definition. So you can | |
586 | * access the file pointer through any of the sub-structs, | |
587 | * or directly as just 'ki_filp' in this struct. | |
588 | */ | |
2b188cc1 | 589 | struct io_kiocb { |
221c5eb2 | 590 | union { |
09bb8394 | 591 | struct file *file; |
9adbd45d | 592 | struct io_rw rw; |
221c5eb2 | 593 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
594 | struct io_accept accept; |
595 | struct io_sync sync; | |
fbf23849 | 596 | struct io_cancel cancel; |
b29472ee | 597 | struct io_timeout timeout; |
3fbb51c1 | 598 | struct io_connect connect; |
e47293fd | 599 | struct io_sr_msg sr_msg; |
15b71abe | 600 | struct io_open open; |
b5dba59e | 601 | struct io_close close; |
05f3fb3c | 602 | struct io_files_update files_update; |
4840e418 | 603 | struct io_fadvise fadvise; |
c1ca757b | 604 | struct io_madvise madvise; |
3e4827b0 | 605 | struct io_epoll epoll; |
7d67af2c | 606 | struct io_splice splice; |
ddf0322d | 607 | struct io_provide_buf pbuf; |
221c5eb2 | 608 | }; |
2b188cc1 | 609 | |
1a6b74fc | 610 | struct io_async_ctx *io; |
cf6fd4bd | 611 | bool needs_fixed_file; |
d625c6ee | 612 | u8 opcode; |
2b188cc1 JA |
613 | |
614 | struct io_ring_ctx *ctx; | |
d7718a9d | 615 | struct list_head list; |
2b188cc1 | 616 | unsigned int flags; |
c16361c1 | 617 | refcount_t refs; |
4ed734b0 JA |
618 | union { |
619 | struct task_struct *task; | |
620 | unsigned long fsize; | |
621 | }; | |
2b188cc1 | 622 | u64 user_data; |
9e645e11 | 623 | u32 result; |
de0617e4 | 624 | u32 sequence; |
2b188cc1 | 625 | |
d7718a9d JA |
626 | struct list_head link_list; |
627 | ||
fcb323cc JA |
628 | struct list_head inflight_entry; |
629 | ||
05589553 XW |
630 | struct percpu_ref *fixed_file_refs; |
631 | ||
b41e9852 JA |
632 | union { |
633 | /* | |
634 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
635 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
636 | * async armed poll handlers for regular commands. The latter | |
637 | * restore the work, if needed. | |
b41e9852 JA |
638 | */ |
639 | struct { | |
b41e9852 | 640 | struct callback_head task_work; |
d7718a9d JA |
641 | struct hlist_node hash_node; |
642 | struct async_poll *apoll; | |
bcda7baa | 643 | int cflags; |
b41e9852 JA |
644 | }; |
645 | struct io_wq_work work; | |
646 | }; | |
2b188cc1 JA |
647 | }; |
648 | ||
649 | #define IO_PLUG_THRESHOLD 2 | |
def596e9 | 650 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 651 | |
9a56a232 JA |
652 | struct io_submit_state { |
653 | struct blk_plug plug; | |
654 | ||
2579f913 JA |
655 | /* |
656 | * io_kiocb alloc cache | |
657 | */ | |
658 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 659 | unsigned int free_reqs; |
2579f913 | 660 | |
9a56a232 JA |
661 | /* |
662 | * File reference cache | |
663 | */ | |
664 | struct file *file; | |
665 | unsigned int fd; | |
666 | unsigned int has_refs; | |
667 | unsigned int used_refs; | |
668 | unsigned int ios_left; | |
669 | }; | |
670 | ||
d3656344 JA |
671 | struct io_op_def { |
672 | /* needs req->io allocated for deferral/async */ | |
673 | unsigned async_ctx : 1; | |
674 | /* needs current->mm setup, does mm access */ | |
675 | unsigned needs_mm : 1; | |
676 | /* needs req->file assigned */ | |
677 | unsigned needs_file : 1; | |
678 | /* needs req->file assigned IFF fd is >= 0 */ | |
679 | unsigned fd_non_neg : 1; | |
680 | /* hash wq insertion if file is a regular file */ | |
681 | unsigned hash_reg_file : 1; | |
682 | /* unbound wq insertion if file is a non-regular file */ | |
683 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
684 | /* opcode is not supported by this kernel */ |
685 | unsigned not_supported : 1; | |
f86cd20c JA |
686 | /* needs file table */ |
687 | unsigned file_table : 1; | |
ff002b30 JA |
688 | /* needs ->fs */ |
689 | unsigned needs_fs : 1; | |
8a72758c JA |
690 | /* set if opcode supports polled "wait" */ |
691 | unsigned pollin : 1; | |
692 | unsigned pollout : 1; | |
bcda7baa JA |
693 | /* op supports buffer selection */ |
694 | unsigned buffer_select : 1; | |
d3656344 JA |
695 | }; |
696 | ||
697 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
698 | [IORING_OP_NOP] = {}, |
699 | [IORING_OP_READV] = { | |
d3656344 JA |
700 | .async_ctx = 1, |
701 | .needs_mm = 1, | |
702 | .needs_file = 1, | |
703 | .unbound_nonreg_file = 1, | |
8a72758c | 704 | .pollin = 1, |
4d954c25 | 705 | .buffer_select = 1, |
d3656344 | 706 | }, |
0463b6c5 | 707 | [IORING_OP_WRITEV] = { |
d3656344 JA |
708 | .async_ctx = 1, |
709 | .needs_mm = 1, | |
710 | .needs_file = 1, | |
711 | .hash_reg_file = 1, | |
712 | .unbound_nonreg_file = 1, | |
8a72758c | 713 | .pollout = 1, |
d3656344 | 714 | }, |
0463b6c5 | 715 | [IORING_OP_FSYNC] = { |
d3656344 JA |
716 | .needs_file = 1, |
717 | }, | |
0463b6c5 | 718 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
719 | .needs_file = 1, |
720 | .unbound_nonreg_file = 1, | |
8a72758c | 721 | .pollin = 1, |
d3656344 | 722 | }, |
0463b6c5 | 723 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
724 | .needs_file = 1, |
725 | .hash_reg_file = 1, | |
726 | .unbound_nonreg_file = 1, | |
8a72758c | 727 | .pollout = 1, |
d3656344 | 728 | }, |
0463b6c5 | 729 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
730 | .needs_file = 1, |
731 | .unbound_nonreg_file = 1, | |
732 | }, | |
0463b6c5 PB |
733 | [IORING_OP_POLL_REMOVE] = {}, |
734 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
735 | .needs_file = 1, |
736 | }, | |
0463b6c5 | 737 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
738 | .async_ctx = 1, |
739 | .needs_mm = 1, | |
740 | .needs_file = 1, | |
741 | .unbound_nonreg_file = 1, | |
ff002b30 | 742 | .needs_fs = 1, |
8a72758c | 743 | .pollout = 1, |
d3656344 | 744 | }, |
0463b6c5 | 745 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
746 | .async_ctx = 1, |
747 | .needs_mm = 1, | |
748 | .needs_file = 1, | |
749 | .unbound_nonreg_file = 1, | |
ff002b30 | 750 | .needs_fs = 1, |
8a72758c | 751 | .pollin = 1, |
52de1fe1 | 752 | .buffer_select = 1, |
d3656344 | 753 | }, |
0463b6c5 | 754 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
755 | .async_ctx = 1, |
756 | .needs_mm = 1, | |
757 | }, | |
0463b6c5 PB |
758 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
759 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
760 | .needs_mm = 1, |
761 | .needs_file = 1, | |
762 | .unbound_nonreg_file = 1, | |
f86cd20c | 763 | .file_table = 1, |
8a72758c | 764 | .pollin = 1, |
d3656344 | 765 | }, |
0463b6c5 PB |
766 | [IORING_OP_ASYNC_CANCEL] = {}, |
767 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
768 | .async_ctx = 1, |
769 | .needs_mm = 1, | |
770 | }, | |
0463b6c5 | 771 | [IORING_OP_CONNECT] = { |
d3656344 JA |
772 | .async_ctx = 1, |
773 | .needs_mm = 1, | |
774 | .needs_file = 1, | |
775 | .unbound_nonreg_file = 1, | |
8a72758c | 776 | .pollout = 1, |
d3656344 | 777 | }, |
0463b6c5 | 778 | [IORING_OP_FALLOCATE] = { |
d3656344 JA |
779 | .needs_file = 1, |
780 | }, | |
0463b6c5 | 781 | [IORING_OP_OPENAT] = { |
d3656344 JA |
782 | .needs_file = 1, |
783 | .fd_non_neg = 1, | |
f86cd20c | 784 | .file_table = 1, |
ff002b30 | 785 | .needs_fs = 1, |
d3656344 | 786 | }, |
0463b6c5 | 787 | [IORING_OP_CLOSE] = { |
d3656344 | 788 | .needs_file = 1, |
f86cd20c | 789 | .file_table = 1, |
d3656344 | 790 | }, |
0463b6c5 | 791 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 792 | .needs_mm = 1, |
f86cd20c | 793 | .file_table = 1, |
d3656344 | 794 | }, |
0463b6c5 | 795 | [IORING_OP_STATX] = { |
d3656344 JA |
796 | .needs_mm = 1, |
797 | .needs_file = 1, | |
798 | .fd_non_neg = 1, | |
ff002b30 | 799 | .needs_fs = 1, |
d3656344 | 800 | }, |
0463b6c5 | 801 | [IORING_OP_READ] = { |
3a6820f2 JA |
802 | .needs_mm = 1, |
803 | .needs_file = 1, | |
804 | .unbound_nonreg_file = 1, | |
8a72758c | 805 | .pollin = 1, |
bcda7baa | 806 | .buffer_select = 1, |
3a6820f2 | 807 | }, |
0463b6c5 | 808 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
809 | .needs_mm = 1, |
810 | .needs_file = 1, | |
811 | .unbound_nonreg_file = 1, | |
8a72758c | 812 | .pollout = 1, |
3a6820f2 | 813 | }, |
0463b6c5 | 814 | [IORING_OP_FADVISE] = { |
4840e418 JA |
815 | .needs_file = 1, |
816 | }, | |
0463b6c5 | 817 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
818 | .needs_mm = 1, |
819 | }, | |
0463b6c5 | 820 | [IORING_OP_SEND] = { |
fddaface JA |
821 | .needs_mm = 1, |
822 | .needs_file = 1, | |
823 | .unbound_nonreg_file = 1, | |
8a72758c | 824 | .pollout = 1, |
fddaface | 825 | }, |
0463b6c5 | 826 | [IORING_OP_RECV] = { |
fddaface JA |
827 | .needs_mm = 1, |
828 | .needs_file = 1, | |
829 | .unbound_nonreg_file = 1, | |
8a72758c | 830 | .pollin = 1, |
bcda7baa | 831 | .buffer_select = 1, |
fddaface | 832 | }, |
0463b6c5 | 833 | [IORING_OP_OPENAT2] = { |
cebdb986 JA |
834 | .needs_file = 1, |
835 | .fd_non_neg = 1, | |
f86cd20c | 836 | .file_table = 1, |
ff002b30 | 837 | .needs_fs = 1, |
cebdb986 | 838 | }, |
3e4827b0 JA |
839 | [IORING_OP_EPOLL_CTL] = { |
840 | .unbound_nonreg_file = 1, | |
841 | .file_table = 1, | |
842 | }, | |
7d67af2c PB |
843 | [IORING_OP_SPLICE] = { |
844 | .needs_file = 1, | |
845 | .hash_reg_file = 1, | |
846 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
847 | }, |
848 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 849 | [IORING_OP_REMOVE_BUFFERS] = {}, |
d3656344 JA |
850 | }; |
851 | ||
561fb04a | 852 | static void io_wq_submit_work(struct io_wq_work **workptr); |
78e19bbe | 853 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 854 | static void io_put_req(struct io_kiocb *req); |
978db57e | 855 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
856 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
857 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
858 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
859 | struct io_uring_files_update *ip, | |
860 | unsigned nr_args); | |
f86cd20c | 861 | static int io_grab_files(struct io_kiocb *req); |
99bc4c38 | 862 | static void io_cleanup_req(struct io_kiocb *req); |
b41e9852 JA |
863 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
864 | int fd, struct file **out_file, bool fixed); | |
865 | static void __io_queue_sqe(struct io_kiocb *req, | |
866 | const struct io_uring_sqe *sqe); | |
de0617e4 | 867 | |
2b188cc1 JA |
868 | static struct kmem_cache *req_cachep; |
869 | ||
870 | static const struct file_operations io_uring_fops; | |
871 | ||
872 | struct sock *io_uring_get_socket(struct file *file) | |
873 | { | |
874 | #if defined(CONFIG_UNIX) | |
875 | if (file->f_op == &io_uring_fops) { | |
876 | struct io_ring_ctx *ctx = file->private_data; | |
877 | ||
878 | return ctx->ring_sock->sk; | |
879 | } | |
880 | #endif | |
881 | return NULL; | |
882 | } | |
883 | EXPORT_SYMBOL(io_uring_get_socket); | |
884 | ||
885 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) | |
886 | { | |
887 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
888 | ||
206aefde | 889 | complete(&ctx->completions[0]); |
2b188cc1 JA |
890 | } |
891 | ||
892 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) | |
893 | { | |
894 | struct io_ring_ctx *ctx; | |
78076bb6 | 895 | int hash_bits; |
2b188cc1 JA |
896 | |
897 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
898 | if (!ctx) | |
899 | return NULL; | |
900 | ||
0ddf92e8 JA |
901 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
902 | if (!ctx->fallback_req) | |
903 | goto err; | |
904 | ||
206aefde JA |
905 | ctx->completions = kmalloc(2 * sizeof(struct completion), GFP_KERNEL); |
906 | if (!ctx->completions) | |
907 | goto err; | |
908 | ||
78076bb6 JA |
909 | /* |
910 | * Use 5 bits less than the max cq entries, that should give us around | |
911 | * 32 entries per hash list if totally full and uniformly spread. | |
912 | */ | |
913 | hash_bits = ilog2(p->cq_entries); | |
914 | hash_bits -= 5; | |
915 | if (hash_bits <= 0) | |
916 | hash_bits = 1; | |
917 | ctx->cancel_hash_bits = hash_bits; | |
918 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
919 | GFP_KERNEL); | |
920 | if (!ctx->cancel_hash) | |
921 | goto err; | |
922 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
923 | ||
21482896 | 924 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
925 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
926 | goto err; | |
2b188cc1 JA |
927 | |
928 | ctx->flags = p->flags; | |
929 | init_waitqueue_head(&ctx->cq_wait); | |
1d7bb1d5 | 930 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
206aefde JA |
931 | init_completion(&ctx->completions[0]); |
932 | init_completion(&ctx->completions[1]); | |
5a2e745d | 933 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 934 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
935 | mutex_init(&ctx->uring_lock); |
936 | init_waitqueue_head(&ctx->wait); | |
937 | spin_lock_init(&ctx->completion_lock); | |
def596e9 | 938 | INIT_LIST_HEAD(&ctx->poll_list); |
de0617e4 | 939 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 940 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
941 | init_waitqueue_head(&ctx->inflight_wait); |
942 | spin_lock_init(&ctx->inflight_lock); | |
943 | INIT_LIST_HEAD(&ctx->inflight_list); | |
2b188cc1 | 944 | return ctx; |
206aefde | 945 | err: |
0ddf92e8 JA |
946 | if (ctx->fallback_req) |
947 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
206aefde | 948 | kfree(ctx->completions); |
78076bb6 | 949 | kfree(ctx->cancel_hash); |
206aefde JA |
950 | kfree(ctx); |
951 | return NULL; | |
2b188cc1 JA |
952 | } |
953 | ||
9d858b21 | 954 | static inline bool __req_need_defer(struct io_kiocb *req) |
7adf4eaf | 955 | { |
a197f664 JL |
956 | struct io_ring_ctx *ctx = req->ctx; |
957 | ||
498ccd9e JA |
958 | return req->sequence != ctx->cached_cq_tail + ctx->cached_sq_dropped |
959 | + atomic_read(&ctx->cached_cq_overflow); | |
7adf4eaf JA |
960 | } |
961 | ||
9d858b21 | 962 | static inline bool req_need_defer(struct io_kiocb *req) |
de0617e4 | 963 | { |
87987898 | 964 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) |
9d858b21 | 965 | return __req_need_defer(req); |
de0617e4 | 966 | |
9d858b21 | 967 | return false; |
de0617e4 JA |
968 | } |
969 | ||
7adf4eaf | 970 | static struct io_kiocb *io_get_deferred_req(struct io_ring_ctx *ctx) |
de0617e4 JA |
971 | { |
972 | struct io_kiocb *req; | |
973 | ||
7adf4eaf | 974 | req = list_first_entry_or_null(&ctx->defer_list, struct io_kiocb, list); |
9d858b21 | 975 | if (req && !req_need_defer(req)) { |
de0617e4 JA |
976 | list_del_init(&req->list); |
977 | return req; | |
978 | } | |
979 | ||
980 | return NULL; | |
981 | } | |
982 | ||
5262f567 JA |
983 | static struct io_kiocb *io_get_timeout_req(struct io_ring_ctx *ctx) |
984 | { | |
7adf4eaf JA |
985 | struct io_kiocb *req; |
986 | ||
987 | req = list_first_entry_or_null(&ctx->timeout_list, struct io_kiocb, list); | |
93bd25bb JA |
988 | if (req) { |
989 | if (req->flags & REQ_F_TIMEOUT_NOSEQ) | |
990 | return NULL; | |
fb4b3d3f | 991 | if (!__req_need_defer(req)) { |
93bd25bb JA |
992 | list_del_init(&req->list); |
993 | return req; | |
994 | } | |
7adf4eaf JA |
995 | } |
996 | ||
997 | return NULL; | |
5262f567 JA |
998 | } |
999 | ||
de0617e4 | 1000 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1001 | { |
75b28aff | 1002 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1003 | |
07910158 PB |
1004 | /* order cqe stores with ring update */ |
1005 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1006 | |
07910158 PB |
1007 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1008 | wake_up_interruptible(&ctx->cq_wait); | |
1009 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1010 | } |
1011 | } | |
1012 | ||
cccf0ee8 JA |
1013 | static inline void io_req_work_grab_env(struct io_kiocb *req, |
1014 | const struct io_op_def *def) | |
1015 | { | |
1016 | if (!req->work.mm && def->needs_mm) { | |
1017 | mmgrab(current->mm); | |
1018 | req->work.mm = current->mm; | |
2b188cc1 | 1019 | } |
cccf0ee8 JA |
1020 | if (!req->work.creds) |
1021 | req->work.creds = get_current_cred(); | |
ff002b30 JA |
1022 | if (!req->work.fs && def->needs_fs) { |
1023 | spin_lock(¤t->fs->lock); | |
1024 | if (!current->fs->in_exec) { | |
1025 | req->work.fs = current->fs; | |
1026 | req->work.fs->users++; | |
1027 | } else { | |
1028 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1029 | } | |
1030 | spin_unlock(¤t->fs->lock); | |
1031 | } | |
6ab23144 JA |
1032 | if (!req->work.task_pid) |
1033 | req->work.task_pid = task_pid_vnr(current); | |
2b188cc1 JA |
1034 | } |
1035 | ||
cccf0ee8 | 1036 | static inline void io_req_work_drop_env(struct io_kiocb *req) |
18d9be1a | 1037 | { |
cccf0ee8 JA |
1038 | if (req->work.mm) { |
1039 | mmdrop(req->work.mm); | |
1040 | req->work.mm = NULL; | |
1041 | } | |
1042 | if (req->work.creds) { | |
1043 | put_cred(req->work.creds); | |
1044 | req->work.creds = NULL; | |
1045 | } | |
ff002b30 JA |
1046 | if (req->work.fs) { |
1047 | struct fs_struct *fs = req->work.fs; | |
1048 | ||
1049 | spin_lock(&req->work.fs->lock); | |
1050 | if (--fs->users) | |
1051 | fs = NULL; | |
1052 | spin_unlock(&req->work.fs->lock); | |
1053 | if (fs) | |
1054 | free_fs_struct(fs); | |
1055 | } | |
561fb04a JA |
1056 | } |
1057 | ||
8766dd51 | 1058 | static inline void io_prep_async_work(struct io_kiocb *req, |
94ae5e77 | 1059 | struct io_kiocb **link) |
18d9be1a | 1060 | { |
d3656344 | 1061 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1062 | |
d3656344 JA |
1063 | if (req->flags & REQ_F_ISREG) { |
1064 | if (def->hash_reg_file) | |
8766dd51 | 1065 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1066 | } else { |
1067 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1068 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1069 | } |
cccf0ee8 JA |
1070 | |
1071 | io_req_work_grab_env(req, def); | |
54a91f3b | 1072 | |
94ae5e77 | 1073 | *link = io_prep_linked_timeout(req); |
561fb04a JA |
1074 | } |
1075 | ||
a197f664 | 1076 | static inline void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1077 | { |
a197f664 | 1078 | struct io_ring_ctx *ctx = req->ctx; |
94ae5e77 | 1079 | struct io_kiocb *link; |
94ae5e77 | 1080 | |
8766dd51 | 1081 | io_prep_async_work(req, &link); |
561fb04a | 1082 | |
8766dd51 PB |
1083 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1084 | &req->work, req->flags); | |
1085 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1086 | |
1087 | if (link) | |
1088 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1089 | } |
1090 | ||
5262f567 JA |
1091 | static void io_kill_timeout(struct io_kiocb *req) |
1092 | { | |
1093 | int ret; | |
1094 | ||
2d28390a | 1095 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1096 | if (ret != -1) { |
1097 | atomic_inc(&req->ctx->cq_timeouts); | |
842f9612 | 1098 | list_del_init(&req->list); |
f0e20b89 | 1099 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1100 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1101 | io_put_req(req); |
5262f567 JA |
1102 | } |
1103 | } | |
1104 | ||
1105 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1106 | { | |
1107 | struct io_kiocb *req, *tmp; | |
1108 | ||
1109 | spin_lock_irq(&ctx->completion_lock); | |
1110 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, list) | |
1111 | io_kill_timeout(req); | |
1112 | spin_unlock_irq(&ctx->completion_lock); | |
1113 | } | |
1114 | ||
de0617e4 JA |
1115 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1116 | { | |
1117 | struct io_kiocb *req; | |
1118 | ||
5262f567 JA |
1119 | while ((req = io_get_timeout_req(ctx)) != NULL) |
1120 | io_kill_timeout(req); | |
1121 | ||
de0617e4 JA |
1122 | __io_commit_cqring(ctx); |
1123 | ||
87987898 | 1124 | while ((req = io_get_deferred_req(ctx)) != NULL) |
a197f664 | 1125 | io_queue_async_work(req); |
de0617e4 JA |
1126 | } |
1127 | ||
2b188cc1 JA |
1128 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1129 | { | |
75b28aff | 1130 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1131 | unsigned tail; |
1132 | ||
1133 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1134 | /* |
1135 | * writes to the cq entry need to come after reading head; the | |
1136 | * control dependency is enough as we're using WRITE_ONCE to | |
1137 | * fill the cq entry | |
1138 | */ | |
75b28aff | 1139 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1140 | return NULL; |
1141 | ||
1142 | ctx->cached_cq_tail++; | |
75b28aff | 1143 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1144 | } |
1145 | ||
f2842ab5 JA |
1146 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1147 | { | |
f0b493e6 JA |
1148 | if (!ctx->cq_ev_fd) |
1149 | return false; | |
f2842ab5 JA |
1150 | if (!ctx->eventfd_async) |
1151 | return true; | |
b41e9852 | 1152 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1153 | } |
1154 | ||
b41e9852 | 1155 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1156 | { |
1157 | if (waitqueue_active(&ctx->wait)) | |
1158 | wake_up(&ctx->wait); | |
1159 | if (waitqueue_active(&ctx->sqo_wait)) | |
1160 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1161 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1162 | eventfd_signal(ctx->cq_ev_fd, 1); |
1163 | } | |
1164 | ||
c4a2ed72 JA |
1165 | /* Returns true if there are no backlogged entries after the flush */ |
1166 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1167 | { |
1168 | struct io_rings *rings = ctx->rings; | |
1169 | struct io_uring_cqe *cqe; | |
1170 | struct io_kiocb *req; | |
1171 | unsigned long flags; | |
1172 | LIST_HEAD(list); | |
1173 | ||
1174 | if (!force) { | |
1175 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1176 | return true; |
1d7bb1d5 JA |
1177 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1178 | rings->cq_ring_entries)) | |
c4a2ed72 | 1179 | return false; |
1d7bb1d5 JA |
1180 | } |
1181 | ||
1182 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1183 | ||
1184 | /* if force is set, the ring is going away. always drop after that */ | |
1185 | if (force) | |
69b3e546 | 1186 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1187 | |
c4a2ed72 | 1188 | cqe = NULL; |
1d7bb1d5 JA |
1189 | while (!list_empty(&ctx->cq_overflow_list)) { |
1190 | cqe = io_get_cqring(ctx); | |
1191 | if (!cqe && !force) | |
1192 | break; | |
1193 | ||
1194 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
1195 | list); | |
1196 | list_move(&req->list, &list); | |
2ca10259 | 1197 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1198 | if (cqe) { |
1199 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1200 | WRITE_ONCE(cqe->res, req->result); | |
bcda7baa | 1201 | WRITE_ONCE(cqe->flags, req->cflags); |
1d7bb1d5 JA |
1202 | } else { |
1203 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1204 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1209 | if (cqe) { |
1210 | clear_bit(0, &ctx->sq_check_overflow); | |
1211 | clear_bit(0, &ctx->cq_check_overflow); | |
1212 | } | |
1d7bb1d5 JA |
1213 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1214 | io_cqring_ev_posted(ctx); | |
1215 | ||
1216 | while (!list_empty(&list)) { | |
1217 | req = list_first_entry(&list, struct io_kiocb, list); | |
1218 | list_del(&req->list); | |
ec9c02ad | 1219 | io_put_req(req); |
1d7bb1d5 | 1220 | } |
c4a2ed72 JA |
1221 | |
1222 | return cqe != NULL; | |
1d7bb1d5 JA |
1223 | } |
1224 | ||
bcda7baa | 1225 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1226 | { |
78e19bbe | 1227 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1228 | struct io_uring_cqe *cqe; |
1229 | ||
78e19bbe | 1230 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1231 | |
2b188cc1 JA |
1232 | /* |
1233 | * If we can't get a cq entry, userspace overflowed the | |
1234 | * submission (by quite a lot). Increment the overflow count in | |
1235 | * the ring. | |
1236 | */ | |
1237 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1238 | if (likely(cqe)) { |
78e19bbe | 1239 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1240 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1241 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1242 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1243 | WRITE_ONCE(ctx->rings->cq_overflow, |
1244 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1245 | } else { |
ad3eb2c8 JA |
1246 | if (list_empty(&ctx->cq_overflow_list)) { |
1247 | set_bit(0, &ctx->sq_check_overflow); | |
1248 | set_bit(0, &ctx->cq_check_overflow); | |
1249 | } | |
2ca10259 | 1250 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1251 | refcount_inc(&req->refs); |
1252 | req->result = res; | |
bcda7baa | 1253 | req->cflags = cflags; |
1d7bb1d5 | 1254 | list_add_tail(&req->list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1255 | } |
1256 | } | |
1257 | ||
bcda7baa JA |
1258 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1259 | { | |
1260 | __io_cqring_fill_event(req, res, 0); | |
1261 | } | |
1262 | ||
1263 | static void __io_cqring_add_event(struct io_kiocb *req, long res, long cflags) | |
2b188cc1 | 1264 | { |
78e19bbe | 1265 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1266 | unsigned long flags; |
1267 | ||
1268 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1269 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1270 | io_commit_cqring(ctx); |
1271 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1272 | ||
8c838788 | 1273 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1274 | } |
1275 | ||
bcda7baa JA |
1276 | static void io_cqring_add_event(struct io_kiocb *req, long res) |
1277 | { | |
1278 | __io_cqring_add_event(req, res, 0); | |
1279 | } | |
1280 | ||
0ddf92e8 JA |
1281 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1282 | { | |
1283 | return req == (struct io_kiocb *) | |
1284 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1285 | } | |
1286 | ||
1287 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1288 | { | |
1289 | struct io_kiocb *req; | |
1290 | ||
1291 | req = ctx->fallback_req; | |
1292 | if (!test_and_set_bit_lock(0, (unsigned long *) ctx->fallback_req)) | |
1293 | return req; | |
1294 | ||
1295 | return NULL; | |
1296 | } | |
1297 | ||
2579f913 JA |
1298 | static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx, |
1299 | struct io_submit_state *state) | |
2b188cc1 | 1300 | { |
fd6fab2c | 1301 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1302 | struct io_kiocb *req; |
1303 | ||
2579f913 | 1304 | if (!state) { |
fd6fab2c | 1305 | req = kmem_cache_alloc(req_cachep, gfp); |
2579f913 | 1306 | if (unlikely(!req)) |
0ddf92e8 | 1307 | goto fallback; |
2579f913 JA |
1308 | } else if (!state->free_reqs) { |
1309 | size_t sz; | |
1310 | int ret; | |
1311 | ||
1312 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1313 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1314 | ||
1315 | /* | |
1316 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1317 | * retry single alloc to be on the safe side. | |
1318 | */ | |
1319 | if (unlikely(ret <= 0)) { | |
1320 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1321 | if (!state->reqs[0]) | |
0ddf92e8 | 1322 | goto fallback; |
fd6fab2c JA |
1323 | ret = 1; |
1324 | } | |
2579f913 | 1325 | state->free_reqs = ret - 1; |
6c8a3134 | 1326 | req = state->reqs[ret - 1]; |
2579f913 | 1327 | } else { |
2579f913 | 1328 | state->free_reqs--; |
6c8a3134 | 1329 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1330 | } |
1331 | ||
0ddf92e8 | 1332 | got_it: |
1a6b74fc | 1333 | req->io = NULL; |
60c112b0 | 1334 | req->file = NULL; |
2579f913 JA |
1335 | req->ctx = ctx; |
1336 | req->flags = 0; | |
e65ef56d JA |
1337 | /* one is dropped after submission, the other at completion */ |
1338 | refcount_set(&req->refs, 2); | |
9e645e11 | 1339 | req->result = 0; |
561fb04a | 1340 | INIT_IO_WORK(&req->work, io_wq_submit_work); |
2579f913 | 1341 | return req; |
0ddf92e8 JA |
1342 | fallback: |
1343 | req = io_get_fallback_req(ctx); | |
1344 | if (req) | |
1345 | goto got_it; | |
6805b32e | 1346 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
1347 | return NULL; |
1348 | } | |
1349 | ||
8da11c19 PB |
1350 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1351 | bool fixed) | |
1352 | { | |
1353 | if (fixed) | |
05589553 | 1354 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1355 | else |
1356 | fput(file); | |
1357 | } | |
1358 | ||
2b85edfc | 1359 | static void __io_req_do_free(struct io_kiocb *req) |
def596e9 | 1360 | { |
2b85edfc PB |
1361 | if (likely(!io_is_fallback_req(req))) |
1362 | kmem_cache_free(req_cachep, req); | |
1363 | else | |
1364 | clear_bit_unlock(0, (unsigned long *) req->ctx->fallback_req); | |
1365 | } | |
1366 | ||
c6ca97b3 | 1367 | static void __io_req_aux_free(struct io_kiocb *req) |
2b188cc1 | 1368 | { |
929a3af9 PB |
1369 | if (req->flags & REQ_F_NEED_CLEANUP) |
1370 | io_cleanup_req(req); | |
1371 | ||
96fd84d8 | 1372 | kfree(req->io); |
8da11c19 PB |
1373 | if (req->file) |
1374 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
cccf0ee8 JA |
1375 | |
1376 | io_req_work_drop_env(req); | |
def596e9 JA |
1377 | } |
1378 | ||
9e645e11 | 1379 | static void __io_free_req(struct io_kiocb *req) |
2b188cc1 | 1380 | { |
c6ca97b3 | 1381 | __io_req_aux_free(req); |
fcb323cc | 1382 | |
fcb323cc | 1383 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1384 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1385 | unsigned long flags; |
1386 | ||
1387 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1388 | list_del(&req->inflight_entry); | |
1389 | if (waitqueue_active(&ctx->inflight_wait)) | |
1390 | wake_up(&ctx->inflight_wait); | |
1391 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1392 | } | |
2b85edfc PB |
1393 | |
1394 | percpu_ref_put(&req->ctx->refs); | |
1395 | __io_req_do_free(req); | |
e65ef56d JA |
1396 | } |
1397 | ||
c6ca97b3 JA |
1398 | struct req_batch { |
1399 | void *reqs[IO_IOPOLL_BATCH]; | |
1400 | int to_free; | |
1401 | int need_iter; | |
1402 | }; | |
1403 | ||
1404 | static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) | |
1405 | { | |
1406 | if (!rb->to_free) | |
1407 | return; | |
1408 | if (rb->need_iter) { | |
1409 | int i, inflight = 0; | |
1410 | unsigned long flags; | |
1411 | ||
1412 | for (i = 0; i < rb->to_free; i++) { | |
1413 | struct io_kiocb *req = rb->reqs[i]; | |
1414 | ||
10fef4be | 1415 | if (req->flags & REQ_F_FIXED_FILE) { |
c6ca97b3 | 1416 | req->file = NULL; |
05589553 | 1417 | percpu_ref_put(req->fixed_file_refs); |
10fef4be | 1418 | } |
c6ca97b3 JA |
1419 | if (req->flags & REQ_F_INFLIGHT) |
1420 | inflight++; | |
c6ca97b3 JA |
1421 | __io_req_aux_free(req); |
1422 | } | |
1423 | if (!inflight) | |
1424 | goto do_free; | |
1425 | ||
1426 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1427 | for (i = 0; i < rb->to_free; i++) { | |
1428 | struct io_kiocb *req = rb->reqs[i]; | |
1429 | ||
10fef4be | 1430 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 JA |
1431 | list_del(&req->inflight_entry); |
1432 | if (!--inflight) | |
1433 | break; | |
1434 | } | |
1435 | } | |
1436 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1437 | ||
1438 | if (waitqueue_active(&ctx->inflight_wait)) | |
1439 | wake_up(&ctx->inflight_wait); | |
1440 | } | |
1441 | do_free: | |
1442 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1443 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
c6ca97b3 | 1444 | rb->to_free = rb->need_iter = 0; |
e65ef56d JA |
1445 | } |
1446 | ||
a197f664 | 1447 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1448 | { |
a197f664 | 1449 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1450 | int ret; |
1451 | ||
2d28390a | 1452 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1453 | if (ret != -1) { |
78e19bbe | 1454 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd JA |
1455 | io_commit_cqring(ctx); |
1456 | req->flags &= ~REQ_F_LINK; | |
ec9c02ad | 1457 | io_put_req(req); |
2665abfd JA |
1458 | return true; |
1459 | } | |
1460 | ||
1461 | return false; | |
e65ef56d JA |
1462 | } |
1463 | ||
ba816ad6 | 1464 | static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
9e645e11 | 1465 | { |
2665abfd | 1466 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1467 | bool wake_ev = false; |
9e645e11 | 1468 | |
4d7dd462 JA |
1469 | /* Already got next link */ |
1470 | if (req->flags & REQ_F_LINK_NEXT) | |
1471 | return; | |
1472 | ||
9e645e11 JA |
1473 | /* |
1474 | * The list should never be empty when we are called here. But could | |
1475 | * potentially happen if the chain is messed up, check to be on the | |
1476 | * safe side. | |
1477 | */ | |
4493233e PB |
1478 | while (!list_empty(&req->link_list)) { |
1479 | struct io_kiocb *nxt = list_first_entry(&req->link_list, | |
1480 | struct io_kiocb, link_list); | |
94ae5e77 | 1481 | |
4493233e PB |
1482 | if (unlikely((req->flags & REQ_F_LINK_TIMEOUT) && |
1483 | (nxt->flags & REQ_F_TIMEOUT))) { | |
1484 | list_del_init(&nxt->link_list); | |
94ae5e77 | 1485 | wake_ev |= io_link_cancel_timeout(nxt); |
94ae5e77 JA |
1486 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
1487 | continue; | |
1488 | } | |
9e645e11 | 1489 | |
4493233e PB |
1490 | list_del_init(&req->link_list); |
1491 | if (!list_empty(&nxt->link_list)) | |
1492 | nxt->flags |= REQ_F_LINK; | |
b18fdf71 | 1493 | *nxtptr = nxt; |
94ae5e77 | 1494 | break; |
9e645e11 | 1495 | } |
2665abfd | 1496 | |
4d7dd462 | 1497 | req->flags |= REQ_F_LINK_NEXT; |
2665abfd JA |
1498 | if (wake_ev) |
1499 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1500 | } |
1501 | ||
1502 | /* | |
1503 | * Called if REQ_F_LINK is set, and we fail the head request | |
1504 | */ | |
1505 | static void io_fail_links(struct io_kiocb *req) | |
1506 | { | |
2665abfd | 1507 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1508 | unsigned long flags; |
1509 | ||
1510 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
9e645e11 JA |
1511 | |
1512 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1513 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1514 | struct io_kiocb, link_list); | |
9e645e11 | 1515 | |
4493233e | 1516 | list_del_init(&link->link_list); |
c826bd7a | 1517 | trace_io_uring_fail_link(req, link); |
2665abfd JA |
1518 | |
1519 | if ((req->flags & REQ_F_LINK_TIMEOUT) && | |
d625c6ee | 1520 | link->opcode == IORING_OP_LINK_TIMEOUT) { |
a197f664 | 1521 | io_link_cancel_timeout(link); |
2665abfd | 1522 | } else { |
78e19bbe | 1523 | io_cqring_fill_event(link, -ECANCELED); |
978db57e | 1524 | __io_double_put_req(link); |
2665abfd | 1525 | } |
5d960724 | 1526 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1527 | } |
2665abfd JA |
1528 | |
1529 | io_commit_cqring(ctx); | |
1530 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1531 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1532 | } |
1533 | ||
4d7dd462 | 1534 | static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) |
9e645e11 | 1535 | { |
4d7dd462 | 1536 | if (likely(!(req->flags & REQ_F_LINK))) |
2665abfd | 1537 | return; |
2665abfd | 1538 | |
9e645e11 JA |
1539 | /* |
1540 | * If LINK is set, we have dependent requests in this chain. If we | |
1541 | * didn't fail this request, queue the first one up, moving any other | |
1542 | * dependencies to the next request. In case of failure, fail the rest | |
1543 | * of the chain. | |
1544 | */ | |
2665abfd JA |
1545 | if (req->flags & REQ_F_FAIL_LINK) { |
1546 | io_fail_links(req); | |
7c9e7f0f JA |
1547 | } else if ((req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_COMP_LOCKED)) == |
1548 | REQ_F_LINK_TIMEOUT) { | |
2665abfd JA |
1549 | struct io_ring_ctx *ctx = req->ctx; |
1550 | unsigned long flags; | |
1551 | ||
1552 | /* | |
1553 | * If this is a timeout link, we could be racing with the | |
1554 | * timeout timer. Grab the completion lock for this case to | |
7c9e7f0f | 1555 | * protect against that. |
2665abfd JA |
1556 | */ |
1557 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1558 | io_req_link_next(req, nxt); | |
1559 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1560 | } else { | |
1561 | io_req_link_next(req, nxt); | |
9e645e11 | 1562 | } |
4d7dd462 | 1563 | } |
9e645e11 | 1564 | |
c69f8dbe JL |
1565 | static void io_free_req(struct io_kiocb *req) |
1566 | { | |
944e58bf PB |
1567 | struct io_kiocb *nxt = NULL; |
1568 | ||
1569 | io_req_find_next(req, &nxt); | |
70cf9f32 | 1570 | __io_free_req(req); |
944e58bf PB |
1571 | |
1572 | if (nxt) | |
1573 | io_queue_async_work(nxt); | |
c69f8dbe JL |
1574 | } |
1575 | ||
7a743e22 PB |
1576 | static void io_link_work_cb(struct io_wq_work **workptr) |
1577 | { | |
18a542ff PB |
1578 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
1579 | struct io_kiocb *link; | |
7a743e22 | 1580 | |
18a542ff | 1581 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
7a743e22 PB |
1582 | io_queue_linked_timeout(link); |
1583 | io_wq_submit_work(workptr); | |
1584 | } | |
1585 | ||
1586 | static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) | |
1587 | { | |
1588 | struct io_kiocb *link; | |
8766dd51 PB |
1589 | const struct io_op_def *def = &io_op_defs[nxt->opcode]; |
1590 | ||
1591 | if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file) | |
1592 | io_wq_hash_work(&nxt->work, file_inode(nxt->file)); | |
7a743e22 PB |
1593 | |
1594 | *workptr = &nxt->work; | |
1595 | link = io_prep_linked_timeout(nxt); | |
18a542ff | 1596 | if (link) |
7a743e22 | 1597 | nxt->work.func = io_link_work_cb; |
7a743e22 PB |
1598 | } |
1599 | ||
ba816ad6 JA |
1600 | /* |
1601 | * Drop reference to request, return next in chain (if there is one) if this | |
1602 | * was the last reference to this request. | |
1603 | */ | |
f9bd67f6 | 1604 | __attribute__((nonnull)) |
ec9c02ad | 1605 | static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
e65ef56d | 1606 | { |
2a44f467 JA |
1607 | if (refcount_dec_and_test(&req->refs)) { |
1608 | io_req_find_next(req, nxtptr); | |
4d7dd462 | 1609 | __io_free_req(req); |
2a44f467 | 1610 | } |
2b188cc1 JA |
1611 | } |
1612 | ||
e65ef56d JA |
1613 | static void io_put_req(struct io_kiocb *req) |
1614 | { | |
1615 | if (refcount_dec_and_test(&req->refs)) | |
1616 | io_free_req(req); | |
2b188cc1 JA |
1617 | } |
1618 | ||
e9fd9396 PB |
1619 | static void io_steal_work(struct io_kiocb *req, |
1620 | struct io_wq_work **workptr) | |
7a743e22 PB |
1621 | { |
1622 | /* | |
1623 | * It's in an io-wq worker, so there always should be at least | |
1624 | * one reference, which will be dropped in io_put_work() just | |
1625 | * after the current handler returns. | |
1626 | * | |
1627 | * It also means, that if the counter dropped to 1, then there is | |
1628 | * no asynchronous users left, so it's safe to steal the next work. | |
1629 | */ | |
7a743e22 PB |
1630 | if (refcount_read(&req->refs) == 1) { |
1631 | struct io_kiocb *nxt = NULL; | |
1632 | ||
1633 | io_req_find_next(req, &nxt); | |
1634 | if (nxt) | |
1635 | io_wq_assign_next(workptr, nxt); | |
1636 | } | |
1637 | } | |
1638 | ||
978db57e JA |
1639 | /* |
1640 | * Must only be used if we don't need to care about links, usually from | |
1641 | * within the completion handling itself. | |
1642 | */ | |
1643 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1644 | { |
1645 | /* drop both submit and complete references */ | |
1646 | if (refcount_sub_and_test(2, &req->refs)) | |
1647 | __io_free_req(req); | |
1648 | } | |
1649 | ||
978db57e JA |
1650 | static void io_double_put_req(struct io_kiocb *req) |
1651 | { | |
1652 | /* drop both submit and complete references */ | |
1653 | if (refcount_sub_and_test(2, &req->refs)) | |
1654 | io_free_req(req); | |
1655 | } | |
1656 | ||
1d7bb1d5 | 1657 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1658 | { |
84f97dc2 JA |
1659 | struct io_rings *rings = ctx->rings; |
1660 | ||
ad3eb2c8 JA |
1661 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1662 | /* | |
1663 | * noflush == true is from the waitqueue handler, just ensure | |
1664 | * we wake up the task, and the next invocation will flush the | |
1665 | * entries. We cannot safely to it from here. | |
1666 | */ | |
1667 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1668 | return -1U; | |
1d7bb1d5 | 1669 | |
ad3eb2c8 JA |
1670 | io_cqring_overflow_flush(ctx, false); |
1671 | } | |
1d7bb1d5 | 1672 | |
a3a0e43f JA |
1673 | /* See comment at the top of this file */ |
1674 | smp_rmb(); | |
ad3eb2c8 | 1675 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1676 | } |
1677 | ||
fb5ccc98 PB |
1678 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1679 | { | |
1680 | struct io_rings *rings = ctx->rings; | |
1681 | ||
1682 | /* make sure SQ entry isn't read before tail */ | |
1683 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1684 | } | |
1685 | ||
8237e045 | 1686 | static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) |
e94f141b | 1687 | { |
c6ca97b3 JA |
1688 | if ((req->flags & REQ_F_LINK) || io_is_fallback_req(req)) |
1689 | return false; | |
e94f141b | 1690 | |
c6ca97b3 JA |
1691 | if (!(req->flags & REQ_F_FIXED_FILE) || req->io) |
1692 | rb->need_iter++; | |
1693 | ||
1694 | rb->reqs[rb->to_free++] = req; | |
1695 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1696 | io_free_req_many(req->ctx, rb); | |
1697 | return true; | |
e94f141b JA |
1698 | } |
1699 | ||
bcda7baa JA |
1700 | static int io_put_kbuf(struct io_kiocb *req) |
1701 | { | |
4d954c25 | 1702 | struct io_buffer *kbuf; |
bcda7baa JA |
1703 | int cflags; |
1704 | ||
4d954c25 | 1705 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1706 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1707 | cflags |= IORING_CQE_F_BUFFER; | |
1708 | req->rw.addr = 0; | |
1709 | kfree(kbuf); | |
1710 | return cflags; | |
1711 | } | |
1712 | ||
def596e9 JA |
1713 | /* |
1714 | * Find and free completed poll iocbs | |
1715 | */ | |
1716 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1717 | struct list_head *done) | |
1718 | { | |
8237e045 | 1719 | struct req_batch rb; |
def596e9 | 1720 | struct io_kiocb *req; |
def596e9 | 1721 | |
c6ca97b3 | 1722 | rb.to_free = rb.need_iter = 0; |
def596e9 | 1723 | while (!list_empty(done)) { |
bcda7baa JA |
1724 | int cflags = 0; |
1725 | ||
def596e9 JA |
1726 | req = list_first_entry(done, struct io_kiocb, list); |
1727 | list_del(&req->list); | |
1728 | ||
bcda7baa JA |
1729 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1730 | cflags = io_put_kbuf(req); | |
1731 | ||
1732 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1733 | (*nr_events)++; |
1734 | ||
8237e045 JA |
1735 | if (refcount_dec_and_test(&req->refs) && |
1736 | !io_req_multi_free(&rb, req)) | |
1737 | io_free_req(req); | |
def596e9 | 1738 | } |
def596e9 | 1739 | |
09bb8394 | 1740 | io_commit_cqring(ctx); |
32b2244a XW |
1741 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1742 | io_cqring_ev_posted(ctx); | |
8237e045 | 1743 | io_free_req_many(ctx, &rb); |
def596e9 JA |
1744 | } |
1745 | ||
1746 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1747 | long min) | |
1748 | { | |
1749 | struct io_kiocb *req, *tmp; | |
1750 | LIST_HEAD(done); | |
1751 | bool spin; | |
1752 | int ret; | |
1753 | ||
1754 | /* | |
1755 | * Only spin for completions if we don't have multiple devices hanging | |
1756 | * off our complete list, and we're under the requested amount. | |
1757 | */ | |
1758 | spin = !ctx->poll_multi_file && *nr_events < min; | |
1759 | ||
1760 | ret = 0; | |
1761 | list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) { | |
9adbd45d | 1762 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
1763 | |
1764 | /* | |
1765 | * Move completed entries to our local list. If we find a | |
1766 | * request that requires polling, break out and complete | |
1767 | * the done list first, if we have entries there. | |
1768 | */ | |
1769 | if (req->flags & REQ_F_IOPOLL_COMPLETED) { | |
1770 | list_move_tail(&req->list, &done); | |
1771 | continue; | |
1772 | } | |
1773 | if (!list_empty(&done)) | |
1774 | break; | |
1775 | ||
1776 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
1777 | if (ret < 0) | |
1778 | break; | |
1779 | ||
1780 | if (ret && spin) | |
1781 | spin = false; | |
1782 | ret = 0; | |
1783 | } | |
1784 | ||
1785 | if (!list_empty(&done)) | |
1786 | io_iopoll_complete(ctx, nr_events, &done); | |
1787 | ||
1788 | return ret; | |
1789 | } | |
1790 | ||
1791 | /* | |
d195a66e | 1792 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
1793 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
1794 | * as a non-spinning completion check. | |
1795 | */ | |
1796 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1797 | long min) | |
1798 | { | |
08f5439f | 1799 | while (!list_empty(&ctx->poll_list) && !need_resched()) { |
def596e9 JA |
1800 | int ret; |
1801 | ||
1802 | ret = io_do_iopoll(ctx, nr_events, min); | |
1803 | if (ret < 0) | |
1804 | return ret; | |
1805 | if (!min || *nr_events >= min) | |
1806 | return 0; | |
1807 | } | |
1808 | ||
1809 | return 1; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * We can't just wait for polled events to come to us, we have to actively | |
1814 | * find and complete them. | |
1815 | */ | |
1816 | static void io_iopoll_reap_events(struct io_ring_ctx *ctx) | |
1817 | { | |
1818 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
1819 | return; | |
1820 | ||
1821 | mutex_lock(&ctx->uring_lock); | |
1822 | while (!list_empty(&ctx->poll_list)) { | |
1823 | unsigned int nr_events = 0; | |
1824 | ||
1825 | io_iopoll_getevents(ctx, &nr_events, 1); | |
08f5439f JA |
1826 | |
1827 | /* | |
1828 | * Ensure we allow local-to-the-cpu processing to take place, | |
1829 | * in this case we need to ensure that we reap all events. | |
1830 | */ | |
1831 | cond_resched(); | |
def596e9 JA |
1832 | } |
1833 | mutex_unlock(&ctx->uring_lock); | |
1834 | } | |
1835 | ||
c7849be9 XW |
1836 | static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events, |
1837 | long min) | |
def596e9 | 1838 | { |
2b2ed975 | 1839 | int iters = 0, ret = 0; |
500f9fba | 1840 | |
c7849be9 XW |
1841 | /* |
1842 | * We disallow the app entering submit/complete with polling, but we | |
1843 | * still need to lock the ring to prevent racing with polled issue | |
1844 | * that got punted to a workqueue. | |
1845 | */ | |
1846 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
1847 | do { |
1848 | int tmin = 0; | |
1849 | ||
a3a0e43f JA |
1850 | /* |
1851 | * Don't enter poll loop if we already have events pending. | |
1852 | * If we do, we can potentially be spinning for commands that | |
1853 | * already triggered a CQE (eg in error). | |
1854 | */ | |
1d7bb1d5 | 1855 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
1856 | break; |
1857 | ||
500f9fba JA |
1858 | /* |
1859 | * If a submit got punted to a workqueue, we can have the | |
1860 | * application entering polling for a command before it gets | |
1861 | * issued. That app will hold the uring_lock for the duration | |
1862 | * of the poll right here, so we need to take a breather every | |
1863 | * now and then to ensure that the issue has a chance to add | |
1864 | * the poll to the issued list. Otherwise we can spin here | |
1865 | * forever, while the workqueue is stuck trying to acquire the | |
1866 | * very same mutex. | |
1867 | */ | |
1868 | if (!(++iters & 7)) { | |
1869 | mutex_unlock(&ctx->uring_lock); | |
1870 | mutex_lock(&ctx->uring_lock); | |
1871 | } | |
1872 | ||
def596e9 JA |
1873 | if (*nr_events < min) |
1874 | tmin = min - *nr_events; | |
1875 | ||
1876 | ret = io_iopoll_getevents(ctx, nr_events, tmin); | |
1877 | if (ret <= 0) | |
1878 | break; | |
1879 | ret = 0; | |
1880 | } while (min && !*nr_events && !need_resched()); | |
1881 | ||
500f9fba | 1882 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
1883 | return ret; |
1884 | } | |
1885 | ||
491381ce | 1886 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 1887 | { |
491381ce JA |
1888 | /* |
1889 | * Tell lockdep we inherited freeze protection from submission | |
1890 | * thread. | |
1891 | */ | |
1892 | if (req->flags & REQ_F_ISREG) { | |
1893 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 1894 | |
491381ce | 1895 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 1896 | } |
491381ce | 1897 | file_end_write(req->file); |
2b188cc1 JA |
1898 | } |
1899 | ||
4e88d6e7 JA |
1900 | static inline void req_set_fail_links(struct io_kiocb *req) |
1901 | { | |
1902 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1903 | req->flags |= REQ_F_FAIL_LINK; | |
1904 | } | |
1905 | ||
ba816ad6 | 1906 | static void io_complete_rw_common(struct kiocb *kiocb, long res) |
2b188cc1 | 1907 | { |
9adbd45d | 1908 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 1909 | int cflags = 0; |
2b188cc1 | 1910 | |
491381ce JA |
1911 | if (kiocb->ki_flags & IOCB_WRITE) |
1912 | kiocb_end_write(req); | |
2b188cc1 | 1913 | |
4e88d6e7 JA |
1914 | if (res != req->result) |
1915 | req_set_fail_links(req); | |
bcda7baa JA |
1916 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1917 | cflags = io_put_kbuf(req); | |
1918 | __io_cqring_add_event(req, res, cflags); | |
ba816ad6 JA |
1919 | } |
1920 | ||
1921 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
1922 | { | |
9adbd45d | 1923 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 JA |
1924 | |
1925 | io_complete_rw_common(kiocb, res); | |
e65ef56d | 1926 | io_put_req(req); |
2b188cc1 JA |
1927 | } |
1928 | ||
def596e9 JA |
1929 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
1930 | { | |
9adbd45d | 1931 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 1932 | |
491381ce JA |
1933 | if (kiocb->ki_flags & IOCB_WRITE) |
1934 | kiocb_end_write(req); | |
def596e9 | 1935 | |
4e88d6e7 JA |
1936 | if (res != req->result) |
1937 | req_set_fail_links(req); | |
9e645e11 | 1938 | req->result = res; |
def596e9 JA |
1939 | if (res != -EAGAIN) |
1940 | req->flags |= REQ_F_IOPOLL_COMPLETED; | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * After the iocb has been issued, it's safe to be found on the poll list. | |
1945 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
1946 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
1947 | * accessing the kiocb cookie. | |
1948 | */ | |
1949 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
1950 | { | |
1951 | struct io_ring_ctx *ctx = req->ctx; | |
1952 | ||
1953 | /* | |
1954 | * Track whether we have multiple files in our lists. This will impact | |
1955 | * how we do polling eventually, not spinning if we're on potentially | |
1956 | * different devices. | |
1957 | */ | |
1958 | if (list_empty(&ctx->poll_list)) { | |
1959 | ctx->poll_multi_file = false; | |
1960 | } else if (!ctx->poll_multi_file) { | |
1961 | struct io_kiocb *list_req; | |
1962 | ||
1963 | list_req = list_first_entry(&ctx->poll_list, struct io_kiocb, | |
1964 | list); | |
9adbd45d | 1965 | if (list_req->file != req->file) |
def596e9 JA |
1966 | ctx->poll_multi_file = true; |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * For fast devices, IO may have already completed. If it has, add | |
1971 | * it to the front so we find it first. | |
1972 | */ | |
1973 | if (req->flags & REQ_F_IOPOLL_COMPLETED) | |
1974 | list_add(&req->list, &ctx->poll_list); | |
1975 | else | |
1976 | list_add_tail(&req->list, &ctx->poll_list); | |
bdcd3eab XW |
1977 | |
1978 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
1979 | wq_has_sleeper(&ctx->sqo_wait)) | |
1980 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
1981 | } |
1982 | ||
3d6770fb | 1983 | static void io_file_put(struct io_submit_state *state) |
9a56a232 | 1984 | { |
3d6770fb | 1985 | if (state->file) { |
9a56a232 JA |
1986 | int diff = state->has_refs - state->used_refs; |
1987 | ||
1988 | if (diff) | |
1989 | fput_many(state->file, diff); | |
1990 | state->file = NULL; | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * Get as many references to a file as we have IOs left in this submission, | |
1996 | * assuming most submissions are for one file, or at least that each file | |
1997 | * has more than one submission. | |
1998 | */ | |
8da11c19 | 1999 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2000 | { |
2001 | if (!state) | |
2002 | return fget(fd); | |
2003 | ||
2004 | if (state->file) { | |
2005 | if (state->fd == fd) { | |
2006 | state->used_refs++; | |
2007 | state->ios_left--; | |
2008 | return state->file; | |
2009 | } | |
3d6770fb | 2010 | io_file_put(state); |
9a56a232 JA |
2011 | } |
2012 | state->file = fget_many(fd, state->ios_left); | |
2013 | if (!state->file) | |
2014 | return NULL; | |
2015 | ||
2016 | state->fd = fd; | |
2017 | state->has_refs = state->ios_left; | |
2018 | state->used_refs = 1; | |
2019 | state->ios_left--; | |
2020 | return state->file; | |
2021 | } | |
2022 | ||
2b188cc1 JA |
2023 | /* |
2024 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2025 | * any file. For now, just ensure that anything potentially problematic is done | |
2026 | * inline. | |
2027 | */ | |
2028 | static bool io_file_supports_async(struct file *file) | |
2029 | { | |
2030 | umode_t mode = file_inode(file)->i_mode; | |
2031 | ||
10d59345 | 2032 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISSOCK(mode)) |
2b188cc1 JA |
2033 | return true; |
2034 | if (S_ISREG(mode) && file->f_op != &io_uring_fops) | |
2035 | return true; | |
2036 | ||
2037 | return false; | |
2038 | } | |
2039 | ||
3529d8c2 JA |
2040 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2041 | bool force_nonblock) | |
2b188cc1 | 2042 | { |
def596e9 | 2043 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2044 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2045 | unsigned ioprio; |
2046 | int ret; | |
2b188cc1 | 2047 | |
491381ce JA |
2048 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2049 | req->flags |= REQ_F_ISREG; | |
2050 | ||
2b188cc1 | 2051 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2052 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2053 | req->flags |= REQ_F_CUR_POS; | |
2054 | kiocb->ki_pos = req->file->f_pos; | |
2055 | } | |
2b188cc1 | 2056 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2057 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2058 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2059 | if (unlikely(ret)) | |
2060 | return ret; | |
2b188cc1 JA |
2061 | |
2062 | ioprio = READ_ONCE(sqe->ioprio); | |
2063 | if (ioprio) { | |
2064 | ret = ioprio_check_cap(ioprio); | |
2065 | if (ret) | |
09bb8394 | 2066 | return ret; |
2b188cc1 JA |
2067 | |
2068 | kiocb->ki_ioprio = ioprio; | |
2069 | } else | |
2070 | kiocb->ki_ioprio = get_current_ioprio(); | |
2071 | ||
8449eeda | 2072 | /* don't allow async punt if RWF_NOWAIT was requested */ |
491381ce JA |
2073 | if ((kiocb->ki_flags & IOCB_NOWAIT) || |
2074 | (req->file->f_flags & O_NONBLOCK)) | |
8449eeda SB |
2075 | req->flags |= REQ_F_NOWAIT; |
2076 | ||
2077 | if (force_nonblock) | |
2b188cc1 | 2078 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2079 | |
def596e9 | 2080 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2081 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2082 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2083 | return -EOPNOTSUPP; |
2b188cc1 | 2084 | |
def596e9 JA |
2085 | kiocb->ki_flags |= IOCB_HIPRI; |
2086 | kiocb->ki_complete = io_complete_rw_iopoll; | |
6873e0bd | 2087 | req->result = 0; |
def596e9 | 2088 | } else { |
09bb8394 JA |
2089 | if (kiocb->ki_flags & IOCB_HIPRI) |
2090 | return -EINVAL; | |
def596e9 JA |
2091 | kiocb->ki_complete = io_complete_rw; |
2092 | } | |
9adbd45d | 2093 | |
3529d8c2 JA |
2094 | req->rw.addr = READ_ONCE(sqe->addr); |
2095 | req->rw.len = READ_ONCE(sqe->len); | |
bcda7baa | 2096 | /* we own ->private, reuse it for the buffer index / buffer ID */ |
9adbd45d | 2097 | req->rw.kiocb.private = (void *) (unsigned long) |
3529d8c2 | 2098 | READ_ONCE(sqe->buf_index); |
2b188cc1 | 2099 | return 0; |
2b188cc1 JA |
2100 | } |
2101 | ||
2102 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2103 | { | |
2104 | switch (ret) { | |
2105 | case -EIOCBQUEUED: | |
2106 | break; | |
2107 | case -ERESTARTSYS: | |
2108 | case -ERESTARTNOINTR: | |
2109 | case -ERESTARTNOHAND: | |
2110 | case -ERESTART_RESTARTBLOCK: | |
2111 | /* | |
2112 | * We can't just restart the syscall, since previously | |
2113 | * submitted sqes may already be in progress. Just fail this | |
2114 | * IO with EINTR. | |
2115 | */ | |
2116 | ret = -EINTR; | |
2117 | /* fall through */ | |
2118 | default: | |
2119 | kiocb->ki_complete(kiocb, ret, 0); | |
2120 | } | |
2121 | } | |
2122 | ||
014db007 | 2123 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret) |
ba816ad6 | 2124 | { |
ba04291e JA |
2125 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2126 | ||
2127 | if (req->flags & REQ_F_CUR_POS) | |
2128 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2129 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
014db007 | 2130 | io_complete_rw(kiocb, ret, 0); |
ba816ad6 JA |
2131 | else |
2132 | io_rw_done(kiocb, ret); | |
2133 | } | |
2134 | ||
9adbd45d | 2135 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2136 | struct iov_iter *iter) |
edafccee | 2137 | { |
9adbd45d JA |
2138 | struct io_ring_ctx *ctx = req->ctx; |
2139 | size_t len = req->rw.len; | |
edafccee JA |
2140 | struct io_mapped_ubuf *imu; |
2141 | unsigned index, buf_index; | |
2142 | size_t offset; | |
2143 | u64 buf_addr; | |
2144 | ||
2145 | /* attempt to use fixed buffers without having provided iovecs */ | |
2146 | if (unlikely(!ctx->user_bufs)) | |
2147 | return -EFAULT; | |
2148 | ||
9adbd45d | 2149 | buf_index = (unsigned long) req->rw.kiocb.private; |
edafccee JA |
2150 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2151 | return -EFAULT; | |
2152 | ||
2153 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2154 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2155 | buf_addr = req->rw.addr; |
edafccee JA |
2156 | |
2157 | /* overflow */ | |
2158 | if (buf_addr + len < buf_addr) | |
2159 | return -EFAULT; | |
2160 | /* not inside the mapped region */ | |
2161 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2162 | return -EFAULT; | |
2163 | ||
2164 | /* | |
2165 | * May not be a start of buffer, set size appropriately | |
2166 | * and advance us to the beginning. | |
2167 | */ | |
2168 | offset = buf_addr - imu->ubuf; | |
2169 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2170 | |
2171 | if (offset) { | |
2172 | /* | |
2173 | * Don't use iov_iter_advance() here, as it's really slow for | |
2174 | * using the latter parts of a big fixed buffer - it iterates | |
2175 | * over each segment manually. We can cheat a bit here, because | |
2176 | * we know that: | |
2177 | * | |
2178 | * 1) it's a BVEC iter, we set it up | |
2179 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2180 | * first and last bvec | |
2181 | * | |
2182 | * So just find our index, and adjust the iterator afterwards. | |
2183 | * If the offset is within the first bvec (or the whole first | |
2184 | * bvec, just use iov_iter_advance(). This makes it easier | |
2185 | * since we can just skip the first segment, which may not | |
2186 | * be PAGE_SIZE aligned. | |
2187 | */ | |
2188 | const struct bio_vec *bvec = imu->bvec; | |
2189 | ||
2190 | if (offset <= bvec->bv_len) { | |
2191 | iov_iter_advance(iter, offset); | |
2192 | } else { | |
2193 | unsigned long seg_skip; | |
2194 | ||
2195 | /* skip first vec */ | |
2196 | offset -= bvec->bv_len; | |
2197 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2198 | ||
2199 | iter->bvec = bvec + seg_skip; | |
2200 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2201 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2202 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2203 | } |
2204 | } | |
2205 | ||
5e559561 | 2206 | return len; |
edafccee JA |
2207 | } |
2208 | ||
bcda7baa JA |
2209 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2210 | { | |
2211 | if (needs_lock) | |
2212 | mutex_unlock(&ctx->uring_lock); | |
2213 | } | |
2214 | ||
2215 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2216 | { | |
2217 | /* | |
2218 | * "Normal" inline submissions always hold the uring_lock, since we | |
2219 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2220 | * The only exception is when we've detached the request and issue it | |
2221 | * from an async worker thread, grab the lock for that case. | |
2222 | */ | |
2223 | if (needs_lock) | |
2224 | mutex_lock(&ctx->uring_lock); | |
2225 | } | |
2226 | ||
2227 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2228 | int bgid, struct io_buffer *kbuf, | |
2229 | bool needs_lock) | |
2230 | { | |
2231 | struct io_buffer *head; | |
2232 | ||
2233 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2234 | return kbuf; | |
2235 | ||
2236 | io_ring_submit_lock(req->ctx, needs_lock); | |
2237 | ||
2238 | lockdep_assert_held(&req->ctx->uring_lock); | |
2239 | ||
2240 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2241 | if (head) { | |
2242 | if (!list_empty(&head->list)) { | |
2243 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2244 | list); | |
2245 | list_del(&kbuf->list); | |
2246 | } else { | |
2247 | kbuf = head; | |
2248 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2249 | } | |
2250 | if (*len > kbuf->len) | |
2251 | *len = kbuf->len; | |
2252 | } else { | |
2253 | kbuf = ERR_PTR(-ENOBUFS); | |
2254 | } | |
2255 | ||
2256 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2257 | ||
2258 | return kbuf; | |
2259 | } | |
2260 | ||
4d954c25 JA |
2261 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2262 | bool needs_lock) | |
2263 | { | |
2264 | struct io_buffer *kbuf; | |
2265 | int bgid; | |
2266 | ||
2267 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2268 | bgid = (int) (unsigned long) req->rw.kiocb.private; | |
2269 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); | |
2270 | if (IS_ERR(kbuf)) | |
2271 | return kbuf; | |
2272 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2273 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2274 | return u64_to_user_ptr(kbuf->addr); | |
2275 | } | |
2276 | ||
2277 | #ifdef CONFIG_COMPAT | |
2278 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2279 | bool needs_lock) | |
2280 | { | |
2281 | struct compat_iovec __user *uiov; | |
2282 | compat_ssize_t clen; | |
2283 | void __user *buf; | |
2284 | ssize_t len; | |
2285 | ||
2286 | uiov = u64_to_user_ptr(req->rw.addr); | |
2287 | if (!access_ok(uiov, sizeof(*uiov))) | |
2288 | return -EFAULT; | |
2289 | if (__get_user(clen, &uiov->iov_len)) | |
2290 | return -EFAULT; | |
2291 | if (clen < 0) | |
2292 | return -EINVAL; | |
2293 | ||
2294 | len = clen; | |
2295 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2296 | if (IS_ERR(buf)) | |
2297 | return PTR_ERR(buf); | |
2298 | iov[0].iov_base = buf; | |
2299 | iov[0].iov_len = (compat_size_t) len; | |
2300 | return 0; | |
2301 | } | |
2302 | #endif | |
2303 | ||
2304 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2305 | bool needs_lock) | |
2306 | { | |
2307 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2308 | void __user *buf; | |
2309 | ssize_t len; | |
2310 | ||
2311 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2312 | return -EFAULT; | |
2313 | ||
2314 | len = iov[0].iov_len; | |
2315 | if (len < 0) | |
2316 | return -EINVAL; | |
2317 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2318 | if (IS_ERR(buf)) | |
2319 | return PTR_ERR(buf); | |
2320 | iov[0].iov_base = buf; | |
2321 | iov[0].iov_len = len; | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2326 | bool needs_lock) | |
2327 | { | |
2328 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2329 | return 0; | |
2330 | if (!req->rw.len) | |
2331 | return 0; | |
2332 | else if (req->rw.len > 1) | |
2333 | return -EINVAL; | |
2334 | ||
2335 | #ifdef CONFIG_COMPAT | |
2336 | if (req->ctx->compat) | |
2337 | return io_compat_import(req, iov, needs_lock); | |
2338 | #endif | |
2339 | ||
2340 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2341 | } | |
2342 | ||
cf6fd4bd | 2343 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2344 | struct iovec **iovec, struct iov_iter *iter, |
2345 | bool needs_lock) | |
2b188cc1 | 2346 | { |
9adbd45d JA |
2347 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2348 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2349 | ssize_t ret; |
edafccee JA |
2350 | u8 opcode; |
2351 | ||
d625c6ee | 2352 | opcode = req->opcode; |
7d009165 | 2353 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2354 | *iovec = NULL; |
9adbd45d | 2355 | return io_import_fixed(req, rw, iter); |
edafccee | 2356 | } |
2b188cc1 | 2357 | |
bcda7baa JA |
2358 | /* buffer index only valid with fixed read/write, or buffer select */ |
2359 | if (req->rw.kiocb.private && !(req->flags & REQ_F_BUFFER_SELECT)) | |
9adbd45d JA |
2360 | return -EINVAL; |
2361 | ||
3a6820f2 | 2362 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2363 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2364 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2365 | if (IS_ERR(buf)) { | |
bcda7baa | 2366 | *iovec = NULL; |
4d954c25 | 2367 | return PTR_ERR(buf); |
bcda7baa | 2368 | } |
3f9d6441 | 2369 | req->rw.len = sqe_len; |
bcda7baa JA |
2370 | } |
2371 | ||
3a6820f2 JA |
2372 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2373 | *iovec = NULL; | |
3a901598 | 2374 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2375 | } |
2376 | ||
f67676d1 JA |
2377 | if (req->io) { |
2378 | struct io_async_rw *iorw = &req->io->rw; | |
2379 | ||
2380 | *iovec = iorw->iov; | |
2381 | iov_iter_init(iter, rw, *iovec, iorw->nr_segs, iorw->size); | |
2382 | if (iorw->iov == iorw->fast_iov) | |
2383 | *iovec = NULL; | |
2384 | return iorw->size; | |
2385 | } | |
2386 | ||
4d954c25 JA |
2387 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2388 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2389 | if (!ret) { |
2390 | ret = (*iovec)->iov_len; | |
2391 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2392 | } | |
4d954c25 JA |
2393 | *iovec = NULL; |
2394 | return ret; | |
2395 | } | |
2396 | ||
2b188cc1 | 2397 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2398 | if (req->ctx->compat) |
2b188cc1 JA |
2399 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2400 | iovec, iter); | |
2401 | #endif | |
2402 | ||
2403 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2404 | } | |
2405 | ||
31b51510 | 2406 | /* |
32960613 JA |
2407 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2408 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2409 | */ |
32960613 JA |
2410 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2411 | struct iov_iter *iter) | |
2412 | { | |
2413 | ssize_t ret = 0; | |
2414 | ||
2415 | /* | |
2416 | * Don't support polled IO through this interface, and we can't | |
2417 | * support non-blocking either. For the latter, this just causes | |
2418 | * the kiocb to be handled from an async context. | |
2419 | */ | |
2420 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2421 | return -EOPNOTSUPP; | |
2422 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2423 | return -EAGAIN; | |
2424 | ||
2425 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2426 | struct iovec iovec; |
32960613 JA |
2427 | ssize_t nr; |
2428 | ||
311ae9e1 PB |
2429 | if (!iov_iter_is_bvec(iter)) { |
2430 | iovec = iov_iter_iovec(iter); | |
2431 | } else { | |
2432 | /* fixed buffers import bvec */ | |
2433 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2434 | + iter->iov_offset; | |
2435 | iovec.iov_len = min(iter->count, | |
2436 | iter->bvec->bv_len - iter->iov_offset); | |
2437 | } | |
2438 | ||
32960613 JA |
2439 | if (rw == READ) { |
2440 | nr = file->f_op->read(file, iovec.iov_base, | |
2441 | iovec.iov_len, &kiocb->ki_pos); | |
2442 | } else { | |
2443 | nr = file->f_op->write(file, iovec.iov_base, | |
2444 | iovec.iov_len, &kiocb->ki_pos); | |
2445 | } | |
2446 | ||
311ae9e1 PB |
2447 | if (iov_iter_is_bvec(iter)) |
2448 | kunmap(iter->bvec->bv_page); | |
2449 | ||
32960613 JA |
2450 | if (nr < 0) { |
2451 | if (!ret) | |
2452 | ret = nr; | |
2453 | break; | |
2454 | } | |
2455 | ret += nr; | |
2456 | if (nr != iovec.iov_len) | |
2457 | break; | |
2458 | iov_iter_advance(iter, nr); | |
2459 | } | |
2460 | ||
2461 | return ret; | |
2462 | } | |
2463 | ||
b7bb4f7d | 2464 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2465 | struct iovec *iovec, struct iovec *fast_iov, |
2466 | struct iov_iter *iter) | |
2467 | { | |
2468 | req->io->rw.nr_segs = iter->nr_segs; | |
2469 | req->io->rw.size = io_size; | |
2470 | req->io->rw.iov = iovec; | |
2471 | if (!req->io->rw.iov) { | |
2472 | req->io->rw.iov = req->io->rw.fast_iov; | |
2473 | memcpy(req->io->rw.iov, fast_iov, | |
2474 | sizeof(struct iovec) * iter->nr_segs); | |
99bc4c38 PB |
2475 | } else { |
2476 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
2477 | } |
2478 | } | |
2479 | ||
3d9932a8 XW |
2480 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2481 | { | |
2482 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2483 | return req->io == NULL; | |
2484 | } | |
2485 | ||
b7bb4f7d | 2486 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2487 | { |
d3656344 JA |
2488 | if (!io_op_defs[req->opcode].async_ctx) |
2489 | return 0; | |
3d9932a8 XW |
2490 | |
2491 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2492 | } |
2493 | ||
b7bb4f7d JA |
2494 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2495 | struct iovec *iovec, struct iovec *fast_iov, | |
2496 | struct iov_iter *iter) | |
2497 | { | |
980ad263 | 2498 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2499 | return 0; |
5d204bcf | 2500 | if (!req->io) { |
3d9932a8 | 2501 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2502 | return -ENOMEM; |
b7bb4f7d | 2503 | |
5d204bcf JA |
2504 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2505 | } | |
b7bb4f7d | 2506 | return 0; |
f67676d1 JA |
2507 | } |
2508 | ||
3529d8c2 JA |
2509 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2510 | bool force_nonblock) | |
f67676d1 | 2511 | { |
3529d8c2 JA |
2512 | struct io_async_ctx *io; |
2513 | struct iov_iter iter; | |
f67676d1 JA |
2514 | ssize_t ret; |
2515 | ||
3529d8c2 JA |
2516 | ret = io_prep_rw(req, sqe, force_nonblock); |
2517 | if (ret) | |
2518 | return ret; | |
f67676d1 | 2519 | |
3529d8c2 JA |
2520 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2521 | return -EBADF; | |
f67676d1 | 2522 | |
5f798bea PB |
2523 | /* either don't need iovec imported or already have it */ |
2524 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2525 | return 0; |
2526 | ||
2527 | io = req->io; | |
2528 | io->rw.iov = io->rw.fast_iov; | |
2529 | req->io = NULL; | |
bcda7baa | 2530 | ret = io_import_iovec(READ, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2531 | req->io = io; |
2532 | if (ret < 0) | |
2533 | return ret; | |
2534 | ||
2535 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2536 | return 0; | |
f67676d1 JA |
2537 | } |
2538 | ||
014db007 | 2539 | static int io_read(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2540 | { |
2541 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2542 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2543 | struct iov_iter iter; |
31b51510 | 2544 | size_t iov_count; |
f67676d1 | 2545 | ssize_t io_size, ret; |
2b188cc1 | 2546 | |
bcda7baa | 2547 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2548 | if (ret < 0) |
2549 | return ret; | |
2b188cc1 | 2550 | |
fd6c2e4c JA |
2551 | /* Ensure we clear previously set non-block flag */ |
2552 | if (!force_nonblock) | |
29de5f6a | 2553 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2554 | |
797f3f53 | 2555 | req->result = 0; |
f67676d1 | 2556 | io_size = ret; |
9e645e11 | 2557 | if (req->flags & REQ_F_LINK) |
f67676d1 JA |
2558 | req->result = io_size; |
2559 | ||
2560 | /* | |
2561 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2562 | * we know to async punt it even if it was opened O_NONBLOCK | |
2563 | */ | |
29de5f6a | 2564 | if (force_nonblock && !io_file_supports_async(req->file)) |
f67676d1 | 2565 | goto copy_iov; |
9e645e11 | 2566 | |
31b51510 | 2567 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2568 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 JA |
2569 | if (!ret) { |
2570 | ssize_t ret2; | |
2571 | ||
9adbd45d JA |
2572 | if (req->file->f_op->read_iter) |
2573 | ret2 = call_read_iter(req->file, kiocb, &iter); | |
32960613 | 2574 | else |
9adbd45d | 2575 | ret2 = loop_rw_iter(READ, req->file, kiocb, &iter); |
32960613 | 2576 | |
9d93a3f5 | 2577 | /* Catch -EAGAIN return for forced non-blocking submission */ |
f67676d1 | 2578 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2579 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2580 | } else { |
2581 | copy_iov: | |
b7bb4f7d | 2582 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2583 | inline_vecs, &iter); |
2584 | if (ret) | |
2585 | goto out_free; | |
29de5f6a JA |
2586 | /* any defer here is final, must blocking retry */ |
2587 | if (!(req->flags & REQ_F_NOWAIT)) | |
2588 | req->flags |= REQ_F_MUST_PUNT; | |
f67676d1 JA |
2589 | return -EAGAIN; |
2590 | } | |
2b188cc1 | 2591 | } |
f67676d1 | 2592 | out_free: |
1e95081c | 2593 | kfree(iovec); |
99bc4c38 | 2594 | req->flags &= ~REQ_F_NEED_CLEANUP; |
2b188cc1 JA |
2595 | return ret; |
2596 | } | |
2597 | ||
3529d8c2 JA |
2598 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2599 | bool force_nonblock) | |
f67676d1 | 2600 | { |
3529d8c2 JA |
2601 | struct io_async_ctx *io; |
2602 | struct iov_iter iter; | |
f67676d1 JA |
2603 | ssize_t ret; |
2604 | ||
3529d8c2 JA |
2605 | ret = io_prep_rw(req, sqe, force_nonblock); |
2606 | if (ret) | |
2607 | return ret; | |
f67676d1 | 2608 | |
3529d8c2 JA |
2609 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
2610 | return -EBADF; | |
f67676d1 | 2611 | |
4ed734b0 JA |
2612 | req->fsize = rlimit(RLIMIT_FSIZE); |
2613 | ||
5f798bea PB |
2614 | /* either don't need iovec imported or already have it */ |
2615 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2616 | return 0; |
2617 | ||
2618 | io = req->io; | |
2619 | io->rw.iov = io->rw.fast_iov; | |
2620 | req->io = NULL; | |
bcda7baa | 2621 | ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2622 | req->io = io; |
2623 | if (ret < 0) | |
2624 | return ret; | |
2625 | ||
2626 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2627 | return 0; | |
f67676d1 JA |
2628 | } |
2629 | ||
014db007 | 2630 | static int io_write(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2631 | { |
2632 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2633 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2634 | struct iov_iter iter; |
31b51510 | 2635 | size_t iov_count; |
f67676d1 | 2636 | ssize_t ret, io_size; |
2b188cc1 | 2637 | |
bcda7baa | 2638 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2639 | if (ret < 0) |
2640 | return ret; | |
2b188cc1 | 2641 | |
fd6c2e4c JA |
2642 | /* Ensure we clear previously set non-block flag */ |
2643 | if (!force_nonblock) | |
9adbd45d | 2644 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2645 | |
797f3f53 | 2646 | req->result = 0; |
f67676d1 | 2647 | io_size = ret; |
9e645e11 | 2648 | if (req->flags & REQ_F_LINK) |
f67676d1 | 2649 | req->result = io_size; |
9e645e11 | 2650 | |
f67676d1 JA |
2651 | /* |
2652 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2653 | * we know to async punt it even if it was opened O_NONBLOCK | |
2654 | */ | |
29de5f6a | 2655 | if (force_nonblock && !io_file_supports_async(req->file)) |
f67676d1 | 2656 | goto copy_iov; |
31b51510 | 2657 | |
10d59345 JA |
2658 | /* file path doesn't support NOWAIT for non-direct_IO */ |
2659 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
2660 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 2661 | goto copy_iov; |
31b51510 | 2662 | |
f67676d1 | 2663 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2664 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 2665 | if (!ret) { |
9bf7933f RP |
2666 | ssize_t ret2; |
2667 | ||
2b188cc1 JA |
2668 | /* |
2669 | * Open-code file_start_write here to grab freeze protection, | |
2670 | * which will be released by another thread in | |
2671 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
2672 | * released so that it doesn't complain about the held lock when | |
2673 | * we return to userspace. | |
2674 | */ | |
491381ce | 2675 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 2676 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 2677 | SB_FREEZE_WRITE, true); |
9adbd45d | 2678 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
2679 | SB_FREEZE_WRITE); |
2680 | } | |
2681 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 2682 | |
4ed734b0 JA |
2683 | if (!force_nonblock) |
2684 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; | |
2685 | ||
9adbd45d JA |
2686 | if (req->file->f_op->write_iter) |
2687 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 2688 | else |
9adbd45d | 2689 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 JA |
2690 | |
2691 | if (!force_nonblock) | |
2692 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
2693 | ||
faac996c | 2694 | /* |
bff6035d | 2695 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
2696 | * retry them without IOCB_NOWAIT. |
2697 | */ | |
2698 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
2699 | ret2 = -EAGAIN; | |
f67676d1 | 2700 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2701 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2702 | } else { |
2703 | copy_iov: | |
b7bb4f7d | 2704 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2705 | inline_vecs, &iter); |
2706 | if (ret) | |
2707 | goto out_free; | |
29de5f6a JA |
2708 | /* any defer here is final, must blocking retry */ |
2709 | req->flags |= REQ_F_MUST_PUNT; | |
f67676d1 JA |
2710 | return -EAGAIN; |
2711 | } | |
2b188cc1 | 2712 | } |
31b51510 | 2713 | out_free: |
99bc4c38 | 2714 | req->flags &= ~REQ_F_NEED_CLEANUP; |
1e95081c | 2715 | kfree(iovec); |
2b188cc1 JA |
2716 | return ret; |
2717 | } | |
2718 | ||
7d67af2c PB |
2719 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2720 | { | |
2721 | struct io_splice* sp = &req->splice; | |
2722 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
2723 | int ret; | |
2724 | ||
2725 | if (req->flags & REQ_F_NEED_CLEANUP) | |
2726 | return 0; | |
2727 | ||
2728 | sp->file_in = NULL; | |
2729 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
2730 | sp->off_out = READ_ONCE(sqe->off); | |
2731 | sp->len = READ_ONCE(sqe->len); | |
2732 | sp->flags = READ_ONCE(sqe->splice_flags); | |
2733 | ||
2734 | if (unlikely(sp->flags & ~valid_flags)) | |
2735 | return -EINVAL; | |
2736 | ||
2737 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
2738 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2739 | if (ret) | |
2740 | return ret; | |
2741 | req->flags |= REQ_F_NEED_CLEANUP; | |
2742 | ||
2743 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) | |
2744 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
2745 | ||
2746 | return 0; | |
2747 | } | |
2748 | ||
2749 | static bool io_splice_punt(struct file *file) | |
2750 | { | |
2751 | if (get_pipe_info(file)) | |
2752 | return false; | |
2753 | if (!io_file_supports_async(file)) | |
2754 | return true; | |
2755 | return !(file->f_mode & O_NONBLOCK); | |
2756 | } | |
2757 | ||
014db007 | 2758 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
2759 | { |
2760 | struct io_splice *sp = &req->splice; | |
2761 | struct file *in = sp->file_in; | |
2762 | struct file *out = sp->file_out; | |
2763 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2764 | loff_t *poff_in, *poff_out; | |
2765 | long ret; | |
2766 | ||
2767 | if (force_nonblock) { | |
2768 | if (io_splice_punt(in) || io_splice_punt(out)) | |
2769 | return -EAGAIN; | |
2770 | flags |= SPLICE_F_NONBLOCK; | |
2771 | } | |
2772 | ||
2773 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
2774 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
2775 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); | |
2776 | if (force_nonblock && ret == -EAGAIN) | |
2777 | return -EAGAIN; | |
2778 | ||
2779 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2780 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2781 | ||
2782 | io_cqring_add_event(req, ret); | |
2783 | if (ret != sp->len) | |
2784 | req_set_fail_links(req); | |
014db007 | 2785 | io_put_req(req); |
7d67af2c PB |
2786 | return 0; |
2787 | } | |
2788 | ||
2b188cc1 JA |
2789 | /* |
2790 | * IORING_OP_NOP just posts a completion event, nothing else. | |
2791 | */ | |
78e19bbe | 2792 | static int io_nop(struct io_kiocb *req) |
2b188cc1 JA |
2793 | { |
2794 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 2795 | |
def596e9 JA |
2796 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
2797 | return -EINVAL; | |
2798 | ||
78e19bbe | 2799 | io_cqring_add_event(req, 0); |
e65ef56d | 2800 | io_put_req(req); |
2b188cc1 JA |
2801 | return 0; |
2802 | } | |
2803 | ||
3529d8c2 | 2804 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 2805 | { |
6b06314c | 2806 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 2807 | |
09bb8394 JA |
2808 | if (!req->file) |
2809 | return -EBADF; | |
c992fe29 | 2810 | |
6b06314c | 2811 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 2812 | return -EINVAL; |
edafccee | 2813 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
2814 | return -EINVAL; |
2815 | ||
8ed8d3c3 JA |
2816 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
2817 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
2818 | return -EINVAL; | |
2819 | ||
2820 | req->sync.off = READ_ONCE(sqe->off); | |
2821 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
2822 | return 0; |
2823 | } | |
2824 | ||
8ed8d3c3 JA |
2825 | static bool io_req_cancelled(struct io_kiocb *req) |
2826 | { | |
2827 | if (req->work.flags & IO_WQ_WORK_CANCEL) { | |
2828 | req_set_fail_links(req); | |
2829 | io_cqring_add_event(req, -ECANCELED); | |
2830 | io_put_req(req); | |
2831 | return true; | |
2832 | } | |
2833 | ||
2834 | return false; | |
2835 | } | |
2836 | ||
014db007 | 2837 | static void __io_fsync(struct io_kiocb *req) |
8ed8d3c3 | 2838 | { |
8ed8d3c3 | 2839 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
2840 | int ret; |
2841 | ||
9adbd45d | 2842 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
2843 | end > 0 ? end : LLONG_MAX, |
2844 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
2845 | if (ret < 0) | |
2846 | req_set_fail_links(req); | |
2847 | io_cqring_add_event(req, ret); | |
014db007 | 2848 | io_put_req(req); |
8ed8d3c3 JA |
2849 | } |
2850 | ||
5ea62161 | 2851 | static void io_fsync_finish(struct io_wq_work **workptr) |
c992fe29 | 2852 | { |
5ea62161 | 2853 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); |
5ea62161 PB |
2854 | |
2855 | if (io_req_cancelled(req)) | |
2856 | return; | |
014db007 | 2857 | __io_fsync(req); |
e9fd9396 | 2858 | io_steal_work(req, workptr); |
8ed8d3c3 | 2859 | } |
c992fe29 | 2860 | |
014db007 | 2861 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
c992fe29 | 2862 | { |
c992fe29 | 2863 | /* fsync always requires a blocking context */ |
8ed8d3c3 | 2864 | if (force_nonblock) { |
8ed8d3c3 | 2865 | req->work.func = io_fsync_finish; |
c992fe29 | 2866 | return -EAGAIN; |
8ed8d3c3 | 2867 | } |
014db007 | 2868 | __io_fsync(req); |
c992fe29 CH |
2869 | return 0; |
2870 | } | |
2871 | ||
014db007 | 2872 | static void __io_fallocate(struct io_kiocb *req) |
8ed8d3c3 | 2873 | { |
8ed8d3c3 JA |
2874 | int ret; |
2875 | ||
4ed734b0 | 2876 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; |
d63d1b5e JA |
2877 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
2878 | req->sync.len); | |
4ed734b0 | 2879 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; |
8ed8d3c3 JA |
2880 | if (ret < 0) |
2881 | req_set_fail_links(req); | |
2882 | io_cqring_add_event(req, ret); | |
014db007 | 2883 | io_put_req(req); |
5ea62161 PB |
2884 | } |
2885 | ||
2886 | static void io_fallocate_finish(struct io_wq_work **workptr) | |
2887 | { | |
2888 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
5ea62161 | 2889 | |
594506fe PB |
2890 | if (io_req_cancelled(req)) |
2891 | return; | |
014db007 | 2892 | __io_fallocate(req); |
e9fd9396 | 2893 | io_steal_work(req, workptr); |
5d17b4a4 JA |
2894 | } |
2895 | ||
d63d1b5e JA |
2896 | static int io_fallocate_prep(struct io_kiocb *req, |
2897 | const struct io_uring_sqe *sqe) | |
2898 | { | |
2899 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
2900 | return -EINVAL; | |
2901 | ||
2902 | req->sync.off = READ_ONCE(sqe->off); | |
2903 | req->sync.len = READ_ONCE(sqe->addr); | |
2904 | req->sync.mode = READ_ONCE(sqe->len); | |
4ed734b0 | 2905 | req->fsize = rlimit(RLIMIT_FSIZE); |
d63d1b5e JA |
2906 | return 0; |
2907 | } | |
2908 | ||
014db007 | 2909 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 2910 | { |
d63d1b5e | 2911 | /* fallocate always requiring blocking context */ |
8ed8d3c3 | 2912 | if (force_nonblock) { |
d63d1b5e | 2913 | req->work.func = io_fallocate_finish; |
5d17b4a4 | 2914 | return -EAGAIN; |
8ed8d3c3 | 2915 | } |
5d17b4a4 | 2916 | |
014db007 | 2917 | __io_fallocate(req); |
5d17b4a4 JA |
2918 | return 0; |
2919 | } | |
2920 | ||
15b71abe | 2921 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 2922 | { |
f8748881 | 2923 | const char __user *fname; |
15b71abe | 2924 | int ret; |
b7bb4f7d | 2925 | |
15b71abe JA |
2926 | if (sqe->ioprio || sqe->buf_index) |
2927 | return -EINVAL; | |
cf3040ca JA |
2928 | if (sqe->flags & IOSQE_FIXED_FILE) |
2929 | return -EBADF; | |
0bdbdd08 PB |
2930 | if (req->flags & REQ_F_NEED_CLEANUP) |
2931 | return 0; | |
03b1230c | 2932 | |
15b71abe | 2933 | req->open.dfd = READ_ONCE(sqe->fd); |
c12cedf2 | 2934 | req->open.how.mode = READ_ONCE(sqe->len); |
f8748881 | 2935 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
c12cedf2 | 2936 | req->open.how.flags = READ_ONCE(sqe->open_flags); |
3529d8c2 | 2937 | |
f8748881 | 2938 | req->open.filename = getname(fname); |
15b71abe JA |
2939 | if (IS_ERR(req->open.filename)) { |
2940 | ret = PTR_ERR(req->open.filename); | |
2941 | req->open.filename = NULL; | |
2942 | return ret; | |
2943 | } | |
3529d8c2 | 2944 | |
4022e7af | 2945 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 2946 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 2947 | return 0; |
03b1230c JA |
2948 | } |
2949 | ||
cebdb986 | 2950 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 2951 | { |
cebdb986 JA |
2952 | struct open_how __user *how; |
2953 | const char __user *fname; | |
2954 | size_t len; | |
0fa03c62 JA |
2955 | int ret; |
2956 | ||
cebdb986 | 2957 | if (sqe->ioprio || sqe->buf_index) |
0fa03c62 | 2958 | return -EINVAL; |
cf3040ca JA |
2959 | if (sqe->flags & IOSQE_FIXED_FILE) |
2960 | return -EBADF; | |
0bdbdd08 PB |
2961 | if (req->flags & REQ_F_NEED_CLEANUP) |
2962 | return 0; | |
0fa03c62 | 2963 | |
cebdb986 JA |
2964 | req->open.dfd = READ_ONCE(sqe->fd); |
2965 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
2966 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
2967 | len = READ_ONCE(sqe->len); | |
0fa03c62 | 2968 | |
cebdb986 JA |
2969 | if (len < OPEN_HOW_SIZE_VER0) |
2970 | return -EINVAL; | |
3529d8c2 | 2971 | |
cebdb986 JA |
2972 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
2973 | len); | |
2974 | if (ret) | |
2975 | return ret; | |
3529d8c2 | 2976 | |
cebdb986 JA |
2977 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) |
2978 | req->open.how.flags |= O_LARGEFILE; | |
0fa03c62 | 2979 | |
cebdb986 JA |
2980 | req->open.filename = getname(fname); |
2981 | if (IS_ERR(req->open.filename)) { | |
2982 | ret = PTR_ERR(req->open.filename); | |
2983 | req->open.filename = NULL; | |
2984 | return ret; | |
2985 | } | |
2986 | ||
4022e7af | 2987 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 2988 | req->flags |= REQ_F_NEED_CLEANUP; |
cebdb986 JA |
2989 | return 0; |
2990 | } | |
2991 | ||
014db007 | 2992 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
2993 | { |
2994 | struct open_flags op; | |
15b71abe JA |
2995 | struct file *file; |
2996 | int ret; | |
2997 | ||
f86cd20c | 2998 | if (force_nonblock) |
15b71abe | 2999 | return -EAGAIN; |
15b71abe | 3000 | |
cebdb986 | 3001 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3002 | if (ret) |
3003 | goto err; | |
3004 | ||
4022e7af | 3005 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3006 | if (ret < 0) |
3007 | goto err; | |
3008 | ||
3009 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3010 | if (IS_ERR(file)) { | |
3011 | put_unused_fd(ret); | |
3012 | ret = PTR_ERR(file); | |
3013 | } else { | |
3014 | fsnotify_open(file); | |
3015 | fd_install(ret, file); | |
3016 | } | |
3017 | err: | |
3018 | putname(req->open.filename); | |
8fef80bf | 3019 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3020 | if (ret < 0) |
3021 | req_set_fail_links(req); | |
3022 | io_cqring_add_event(req, ret); | |
014db007 | 3023 | io_put_req(req); |
15b71abe JA |
3024 | return 0; |
3025 | } | |
3026 | ||
014db007 | 3027 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 JA |
3028 | { |
3029 | req->open.how = build_open_how(req->open.how.flags, req->open.how.mode); | |
014db007 | 3030 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3031 | } |
3032 | ||
067524e9 JA |
3033 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3034 | const struct io_uring_sqe *sqe) | |
3035 | { | |
3036 | struct io_provide_buf *p = &req->pbuf; | |
3037 | u64 tmp; | |
3038 | ||
3039 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3040 | return -EINVAL; | |
3041 | ||
3042 | tmp = READ_ONCE(sqe->fd); | |
3043 | if (!tmp || tmp > USHRT_MAX) | |
3044 | return -EINVAL; | |
3045 | ||
3046 | memset(p, 0, sizeof(*p)); | |
3047 | p->nbufs = tmp; | |
3048 | p->bgid = READ_ONCE(sqe->buf_group); | |
3049 | return 0; | |
3050 | } | |
3051 | ||
3052 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3053 | int bgid, unsigned nbufs) | |
3054 | { | |
3055 | unsigned i = 0; | |
3056 | ||
3057 | /* shouldn't happen */ | |
3058 | if (!nbufs) | |
3059 | return 0; | |
3060 | ||
3061 | /* the head kbuf is the list itself */ | |
3062 | while (!list_empty(&buf->list)) { | |
3063 | struct io_buffer *nxt; | |
3064 | ||
3065 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3066 | list_del(&nxt->list); | |
3067 | kfree(nxt); | |
3068 | if (++i == nbufs) | |
3069 | return i; | |
3070 | } | |
3071 | i++; | |
3072 | kfree(buf); | |
3073 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3074 | ||
3075 | return i; | |
3076 | } | |
3077 | ||
3078 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock) | |
3079 | { | |
3080 | struct io_provide_buf *p = &req->pbuf; | |
3081 | struct io_ring_ctx *ctx = req->ctx; | |
3082 | struct io_buffer *head; | |
3083 | int ret = 0; | |
3084 | ||
3085 | io_ring_submit_lock(ctx, !force_nonblock); | |
3086 | ||
3087 | lockdep_assert_held(&ctx->uring_lock); | |
3088 | ||
3089 | ret = -ENOENT; | |
3090 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3091 | if (head) | |
3092 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3093 | ||
3094 | io_ring_submit_lock(ctx, !force_nonblock); | |
3095 | if (ret < 0) | |
3096 | req_set_fail_links(req); | |
3097 | io_cqring_add_event(req, ret); | |
3098 | io_put_req(req); | |
3099 | return 0; | |
3100 | } | |
3101 | ||
ddf0322d JA |
3102 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3103 | const struct io_uring_sqe *sqe) | |
3104 | { | |
3105 | struct io_provide_buf *p = &req->pbuf; | |
3106 | u64 tmp; | |
3107 | ||
3108 | if (sqe->ioprio || sqe->rw_flags) | |
3109 | return -EINVAL; | |
3110 | ||
3111 | tmp = READ_ONCE(sqe->fd); | |
3112 | if (!tmp || tmp > USHRT_MAX) | |
3113 | return -E2BIG; | |
3114 | p->nbufs = tmp; | |
3115 | p->addr = READ_ONCE(sqe->addr); | |
3116 | p->len = READ_ONCE(sqe->len); | |
3117 | ||
3118 | if (!access_ok(u64_to_user_ptr(p->addr), p->len)) | |
3119 | return -EFAULT; | |
3120 | ||
3121 | p->bgid = READ_ONCE(sqe->buf_group); | |
3122 | tmp = READ_ONCE(sqe->off); | |
3123 | if (tmp > USHRT_MAX) | |
3124 | return -E2BIG; | |
3125 | p->bid = tmp; | |
3126 | return 0; | |
3127 | } | |
3128 | ||
3129 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3130 | { | |
3131 | struct io_buffer *buf; | |
3132 | u64 addr = pbuf->addr; | |
3133 | int i, bid = pbuf->bid; | |
3134 | ||
3135 | for (i = 0; i < pbuf->nbufs; i++) { | |
3136 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3137 | if (!buf) | |
3138 | break; | |
3139 | ||
3140 | buf->addr = addr; | |
3141 | buf->len = pbuf->len; | |
3142 | buf->bid = bid; | |
3143 | addr += pbuf->len; | |
3144 | bid++; | |
3145 | if (!*head) { | |
3146 | INIT_LIST_HEAD(&buf->list); | |
3147 | *head = buf; | |
3148 | } else { | |
3149 | list_add_tail(&buf->list, &(*head)->list); | |
3150 | } | |
3151 | } | |
3152 | ||
3153 | return i ? i : -ENOMEM; | |
3154 | } | |
3155 | ||
ddf0322d JA |
3156 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock) |
3157 | { | |
3158 | struct io_provide_buf *p = &req->pbuf; | |
3159 | struct io_ring_ctx *ctx = req->ctx; | |
3160 | struct io_buffer *head, *list; | |
3161 | int ret = 0; | |
3162 | ||
3163 | io_ring_submit_lock(ctx, !force_nonblock); | |
3164 | ||
3165 | lockdep_assert_held(&ctx->uring_lock); | |
3166 | ||
3167 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3168 | ||
3169 | ret = io_add_buffers(p, &head); | |
3170 | if (ret < 0) | |
3171 | goto out; | |
3172 | ||
3173 | if (!list) { | |
3174 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3175 | GFP_KERNEL); | |
3176 | if (ret < 0) { | |
067524e9 | 3177 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3178 | goto out; |
3179 | } | |
3180 | } | |
3181 | out: | |
3182 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3183 | if (ret < 0) | |
3184 | req_set_fail_links(req); | |
3185 | io_cqring_add_event(req, ret); | |
3186 | io_put_req(req); | |
3187 | return 0; | |
cebdb986 JA |
3188 | } |
3189 | ||
3e4827b0 JA |
3190 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3191 | const struct io_uring_sqe *sqe) | |
3192 | { | |
3193 | #if defined(CONFIG_EPOLL) | |
3194 | if (sqe->ioprio || sqe->buf_index) | |
3195 | return -EINVAL; | |
3196 | ||
3197 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3198 | req->epoll.op = READ_ONCE(sqe->len); | |
3199 | req->epoll.fd = READ_ONCE(sqe->off); | |
3200 | ||
3201 | if (ep_op_has_event(req->epoll.op)) { | |
3202 | struct epoll_event __user *ev; | |
3203 | ||
3204 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3205 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3206 | return -EFAULT; | |
3207 | } | |
3208 | ||
3209 | return 0; | |
3210 | #else | |
3211 | return -EOPNOTSUPP; | |
3212 | #endif | |
3213 | } | |
3214 | ||
014db007 | 3215 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock) |
3e4827b0 JA |
3216 | { |
3217 | #if defined(CONFIG_EPOLL) | |
3218 | struct io_epoll *ie = &req->epoll; | |
3219 | int ret; | |
3220 | ||
3221 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3222 | if (force_nonblock && ret == -EAGAIN) | |
3223 | return -EAGAIN; | |
3224 | ||
3225 | if (ret < 0) | |
3226 | req_set_fail_links(req); | |
3227 | io_cqring_add_event(req, ret); | |
014db007 | 3228 | io_put_req(req); |
3e4827b0 JA |
3229 | return 0; |
3230 | #else | |
3231 | return -EOPNOTSUPP; | |
3232 | #endif | |
3233 | } | |
3234 | ||
c1ca757b JA |
3235 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3236 | { | |
3237 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3238 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3239 | return -EINVAL; | |
3240 | ||
3241 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3242 | req->madvise.len = READ_ONCE(sqe->len); | |
3243 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3244 | return 0; | |
3245 | #else | |
3246 | return -EOPNOTSUPP; | |
3247 | #endif | |
3248 | } | |
3249 | ||
014db007 | 3250 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3251 | { |
3252 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3253 | struct io_madvise *ma = &req->madvise; | |
3254 | int ret; | |
3255 | ||
3256 | if (force_nonblock) | |
3257 | return -EAGAIN; | |
3258 | ||
3259 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3260 | if (ret < 0) | |
3261 | req_set_fail_links(req); | |
3262 | io_cqring_add_event(req, ret); | |
014db007 | 3263 | io_put_req(req); |
c1ca757b JA |
3264 | return 0; |
3265 | #else | |
3266 | return -EOPNOTSUPP; | |
3267 | #endif | |
3268 | } | |
3269 | ||
4840e418 JA |
3270 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3271 | { | |
3272 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3273 | return -EINVAL; | |
3274 | ||
3275 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3276 | req->fadvise.len = READ_ONCE(sqe->len); | |
3277 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3278 | return 0; | |
3279 | } | |
3280 | ||
014db007 | 3281 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3282 | { |
3283 | struct io_fadvise *fa = &req->fadvise; | |
3284 | int ret; | |
3285 | ||
3e69426d JA |
3286 | if (force_nonblock) { |
3287 | switch (fa->advice) { | |
3288 | case POSIX_FADV_NORMAL: | |
3289 | case POSIX_FADV_RANDOM: | |
3290 | case POSIX_FADV_SEQUENTIAL: | |
3291 | break; | |
3292 | default: | |
3293 | return -EAGAIN; | |
3294 | } | |
3295 | } | |
4840e418 JA |
3296 | |
3297 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3298 | if (ret < 0) | |
3299 | req_set_fail_links(req); | |
3300 | io_cqring_add_event(req, ret); | |
014db007 | 3301 | io_put_req(req); |
4840e418 JA |
3302 | return 0; |
3303 | } | |
3304 | ||
eddc7ef5 JA |
3305 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3306 | { | |
f8748881 | 3307 | const char __user *fname; |
eddc7ef5 JA |
3308 | unsigned lookup_flags; |
3309 | int ret; | |
3310 | ||
3311 | if (sqe->ioprio || sqe->buf_index) | |
3312 | return -EINVAL; | |
cf3040ca JA |
3313 | if (sqe->flags & IOSQE_FIXED_FILE) |
3314 | return -EBADF; | |
0bdbdd08 PB |
3315 | if (req->flags & REQ_F_NEED_CLEANUP) |
3316 | return 0; | |
eddc7ef5 JA |
3317 | |
3318 | req->open.dfd = READ_ONCE(sqe->fd); | |
3319 | req->open.mask = READ_ONCE(sqe->len); | |
f8748881 | 3320 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
eddc7ef5 | 3321 | req->open.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
c12cedf2 | 3322 | req->open.how.flags = READ_ONCE(sqe->statx_flags); |
eddc7ef5 | 3323 | |
c12cedf2 | 3324 | if (vfs_stat_set_lookup_flags(&lookup_flags, req->open.how.flags)) |
eddc7ef5 JA |
3325 | return -EINVAL; |
3326 | ||
f8748881 | 3327 | req->open.filename = getname_flags(fname, lookup_flags, NULL); |
eddc7ef5 JA |
3328 | if (IS_ERR(req->open.filename)) { |
3329 | ret = PTR_ERR(req->open.filename); | |
3330 | req->open.filename = NULL; | |
3331 | return ret; | |
3332 | } | |
3333 | ||
8fef80bf | 3334 | req->flags |= REQ_F_NEED_CLEANUP; |
eddc7ef5 JA |
3335 | return 0; |
3336 | } | |
3337 | ||
014db007 | 3338 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 JA |
3339 | { |
3340 | struct io_open *ctx = &req->open; | |
3341 | unsigned lookup_flags; | |
3342 | struct path path; | |
3343 | struct kstat stat; | |
3344 | int ret; | |
3345 | ||
3346 | if (force_nonblock) | |
3347 | return -EAGAIN; | |
3348 | ||
c12cedf2 | 3349 | if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->how.flags)) |
eddc7ef5 JA |
3350 | return -EINVAL; |
3351 | ||
3352 | retry: | |
3353 | /* filename_lookup() drops it, keep a reference */ | |
3354 | ctx->filename->refcnt++; | |
3355 | ||
3356 | ret = filename_lookup(ctx->dfd, ctx->filename, lookup_flags, &path, | |
3357 | NULL); | |
3358 | if (ret) | |
3359 | goto err; | |
3360 | ||
c12cedf2 | 3361 | ret = vfs_getattr(&path, &stat, ctx->mask, ctx->how.flags); |
eddc7ef5 JA |
3362 | path_put(&path); |
3363 | if (retry_estale(ret, lookup_flags)) { | |
3364 | lookup_flags |= LOOKUP_REVAL; | |
3365 | goto retry; | |
3366 | } | |
3367 | if (!ret) | |
3368 | ret = cp_statx(&stat, ctx->buffer); | |
3369 | err: | |
3370 | putname(ctx->filename); | |
8fef80bf | 3371 | req->flags &= ~REQ_F_NEED_CLEANUP; |
eddc7ef5 JA |
3372 | if (ret < 0) |
3373 | req_set_fail_links(req); | |
3374 | io_cqring_add_event(req, ret); | |
014db007 | 3375 | io_put_req(req); |
eddc7ef5 JA |
3376 | return 0; |
3377 | } | |
3378 | ||
b5dba59e JA |
3379 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3380 | { | |
3381 | /* | |
3382 | * If we queue this for async, it must not be cancellable. That would | |
3383 | * leave the 'file' in an undeterminate state. | |
3384 | */ | |
3385 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; | |
3386 | ||
3387 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || | |
3388 | sqe->rw_flags || sqe->buf_index) | |
3389 | return -EINVAL; | |
3390 | if (sqe->flags & IOSQE_FIXED_FILE) | |
cf3040ca | 3391 | return -EBADF; |
b5dba59e JA |
3392 | |
3393 | req->close.fd = READ_ONCE(sqe->fd); | |
3394 | if (req->file->f_op == &io_uring_fops || | |
b14cca0c | 3395 | req->close.fd == req->ctx->ring_fd) |
b5dba59e JA |
3396 | return -EBADF; |
3397 | ||
3398 | return 0; | |
3399 | } | |
3400 | ||
a93b3331 | 3401 | /* only called when __close_fd_get_file() is done */ |
014db007 | 3402 | static void __io_close_finish(struct io_kiocb *req) |
a93b3331 PB |
3403 | { |
3404 | int ret; | |
3405 | ||
3406 | ret = filp_close(req->close.put_file, req->work.files); | |
3407 | if (ret < 0) | |
3408 | req_set_fail_links(req); | |
3409 | io_cqring_add_event(req, ret); | |
3410 | fput(req->close.put_file); | |
014db007 | 3411 | io_put_req(req); |
a93b3331 PB |
3412 | } |
3413 | ||
b5dba59e JA |
3414 | static void io_close_finish(struct io_wq_work **workptr) |
3415 | { | |
3416 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
b5dba59e | 3417 | |
7fbeb95d | 3418 | /* not cancellable, don't do io_req_cancelled() */ |
014db007 | 3419 | __io_close_finish(req); |
e9fd9396 | 3420 | io_steal_work(req, workptr); |
b5dba59e JA |
3421 | } |
3422 | ||
014db007 | 3423 | static int io_close(struct io_kiocb *req, bool force_nonblock) |
b5dba59e JA |
3424 | { |
3425 | int ret; | |
3426 | ||
3427 | req->close.put_file = NULL; | |
3428 | ret = __close_fd_get_file(req->close.fd, &req->close.put_file); | |
3429 | if (ret < 0) | |
3430 | return ret; | |
3431 | ||
3432 | /* if the file has a flush method, be safe and punt to async */ | |
a2100672 | 3433 | if (req->close.put_file->f_op->flush && force_nonblock) { |
594506fe PB |
3434 | /* submission ref will be dropped, take it for async */ |
3435 | refcount_inc(&req->refs); | |
3436 | ||
a2100672 PB |
3437 | req->work.func = io_close_finish; |
3438 | /* | |
3439 | * Do manual async queue here to avoid grabbing files - we don't | |
3440 | * need the files, and it'll cause io_close_finish() to close | |
3441 | * the file again and cause a double CQE entry for this request | |
3442 | */ | |
3443 | io_queue_async_work(req); | |
3444 | return 0; | |
3445 | } | |
b5dba59e JA |
3446 | |
3447 | /* | |
3448 | * No ->flush(), safely close from here and just punt the | |
3449 | * fput() to async context. | |
3450 | */ | |
014db007 | 3451 | __io_close_finish(req); |
1a417f4e | 3452 | return 0; |
b5dba59e JA |
3453 | } |
3454 | ||
3529d8c2 | 3455 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3456 | { |
3457 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3458 | |
3459 | if (!req->file) | |
3460 | return -EBADF; | |
5d17b4a4 JA |
3461 | |
3462 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3463 | return -EINVAL; | |
3464 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3465 | return -EINVAL; | |
3466 | ||
8ed8d3c3 JA |
3467 | req->sync.off = READ_ONCE(sqe->off); |
3468 | req->sync.len = READ_ONCE(sqe->len); | |
3469 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3470 | return 0; |
3471 | } | |
3472 | ||
014db007 | 3473 | static void __io_sync_file_range(struct io_kiocb *req) |
8ed8d3c3 | 3474 | { |
8ed8d3c3 JA |
3475 | int ret; |
3476 | ||
9adbd45d | 3477 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3478 | req->sync.flags); |
3479 | if (ret < 0) | |
3480 | req_set_fail_links(req); | |
3481 | io_cqring_add_event(req, ret); | |
014db007 | 3482 | io_put_req(req); |
5ea62161 PB |
3483 | } |
3484 | ||
3485 | ||
3486 | static void io_sync_file_range_finish(struct io_wq_work **workptr) | |
3487 | { | |
3488 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
3489 | struct io_kiocb *nxt = NULL; | |
3490 | ||
3491 | if (io_req_cancelled(req)) | |
3492 | return; | |
014db007 | 3493 | __io_sync_file_range(req); |
594506fe | 3494 | io_put_req(req); /* put submission ref */ |
8ed8d3c3 | 3495 | if (nxt) |
78912934 | 3496 | io_wq_assign_next(workptr, nxt); |
5d17b4a4 JA |
3497 | } |
3498 | ||
014db007 | 3499 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3500 | { |
5d17b4a4 | 3501 | /* sync_file_range always requires a blocking context */ |
8ed8d3c3 | 3502 | if (force_nonblock) { |
8ed8d3c3 | 3503 | req->work.func = io_sync_file_range_finish; |
5d17b4a4 | 3504 | return -EAGAIN; |
8ed8d3c3 | 3505 | } |
5d17b4a4 | 3506 | |
014db007 | 3507 | __io_sync_file_range(req); |
5d17b4a4 JA |
3508 | return 0; |
3509 | } | |
3510 | ||
469956e8 | 3511 | #if defined(CONFIG_NET) |
02d27d89 PB |
3512 | static int io_setup_async_msg(struct io_kiocb *req, |
3513 | struct io_async_msghdr *kmsg) | |
3514 | { | |
3515 | if (req->io) | |
3516 | return -EAGAIN; | |
3517 | if (io_alloc_async_ctx(req)) { | |
3518 | if (kmsg->iov != kmsg->fast_iov) | |
3519 | kfree(kmsg->iov); | |
3520 | return -ENOMEM; | |
3521 | } | |
3522 | req->flags |= REQ_F_NEED_CLEANUP; | |
3523 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3524 | return -EAGAIN; | |
3525 | } | |
3526 | ||
3529d8c2 | 3527 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3528 | { |
e47293fd | 3529 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3530 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3531 | int ret; |
03b1230c | 3532 | |
e47293fd JA |
3533 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3534 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
fddaface | 3535 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3536 | |
d8768362 JA |
3537 | #ifdef CONFIG_COMPAT |
3538 | if (req->ctx->compat) | |
3539 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3540 | #endif | |
3541 | ||
fddaface | 3542 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3543 | return 0; |
5f798bea PB |
3544 | /* iovec is already imported */ |
3545 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3546 | return 0; | |
3529d8c2 | 3547 | |
d9688565 | 3548 | io->msg.iov = io->msg.fast_iov; |
99bc4c38 | 3549 | ret = sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags, |
e47293fd | 3550 | &io->msg.iov); |
99bc4c38 PB |
3551 | if (!ret) |
3552 | req->flags |= REQ_F_NEED_CLEANUP; | |
3553 | return ret; | |
03b1230c JA |
3554 | } |
3555 | ||
014db007 | 3556 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3557 | { |
0b416c3e | 3558 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3559 | struct socket *sock; |
3560 | int ret; | |
3561 | ||
3562 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3563 | return -EINVAL; | |
3564 | ||
3565 | sock = sock_from_file(req->file, &ret); | |
3566 | if (sock) { | |
b7bb4f7d | 3567 | struct io_async_ctx io; |
0fa03c62 JA |
3568 | unsigned flags; |
3569 | ||
03b1230c | 3570 | if (req->io) { |
0b416c3e | 3571 | kmsg = &req->io->msg; |
b537916c | 3572 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3573 | /* if iov is set, it's allocated already */ |
3574 | if (!kmsg->iov) | |
3575 | kmsg->iov = kmsg->fast_iov; | |
3576 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3577 | } else { |
3529d8c2 JA |
3578 | struct io_sr_msg *sr = &req->sr_msg; |
3579 | ||
0b416c3e | 3580 | kmsg = &io.msg; |
b537916c | 3581 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 JA |
3582 | |
3583 | io.msg.iov = io.msg.fast_iov; | |
3584 | ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, | |
3585 | sr->msg_flags, &io.msg.iov); | |
03b1230c | 3586 | if (ret) |
3529d8c2 | 3587 | return ret; |
03b1230c | 3588 | } |
0fa03c62 | 3589 | |
e47293fd JA |
3590 | flags = req->sr_msg.msg_flags; |
3591 | if (flags & MSG_DONTWAIT) | |
3592 | req->flags |= REQ_F_NOWAIT; | |
3593 | else if (force_nonblock) | |
3594 | flags |= MSG_DONTWAIT; | |
3595 | ||
0b416c3e | 3596 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3597 | if (force_nonblock && ret == -EAGAIN) |
3598 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3599 | if (ret == -ERESTARTSYS) |
3600 | ret = -EINTR; | |
0fa03c62 JA |
3601 | } |
3602 | ||
1e95081c | 3603 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3604 | kfree(kmsg->iov); |
99bc4c38 | 3605 | req->flags &= ~REQ_F_NEED_CLEANUP; |
78e19bbe | 3606 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
3607 | if (ret < 0) |
3608 | req_set_fail_links(req); | |
014db007 | 3609 | io_put_req(req); |
5d17b4a4 | 3610 | return 0; |
03b1230c | 3611 | } |
aa1fa28f | 3612 | |
014db007 | 3613 | static int io_send(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3614 | { |
fddaface JA |
3615 | struct socket *sock; |
3616 | int ret; | |
3617 | ||
3618 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3619 | return -EINVAL; | |
3620 | ||
3621 | sock = sock_from_file(req->file, &ret); | |
3622 | if (sock) { | |
3623 | struct io_sr_msg *sr = &req->sr_msg; | |
3624 | struct msghdr msg; | |
3625 | struct iovec iov; | |
3626 | unsigned flags; | |
3627 | ||
3628 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3629 | &msg.msg_iter); | |
3630 | if (ret) | |
3631 | return ret; | |
3632 | ||
3633 | msg.msg_name = NULL; | |
3634 | msg.msg_control = NULL; | |
3635 | msg.msg_controllen = 0; | |
3636 | msg.msg_namelen = 0; | |
3637 | ||
3638 | flags = req->sr_msg.msg_flags; | |
3639 | if (flags & MSG_DONTWAIT) | |
3640 | req->flags |= REQ_F_NOWAIT; | |
3641 | else if (force_nonblock) | |
3642 | flags |= MSG_DONTWAIT; | |
3643 | ||
0b7b21e4 JA |
3644 | msg.msg_flags = flags; |
3645 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3646 | if (force_nonblock && ret == -EAGAIN) |
3647 | return -EAGAIN; | |
3648 | if (ret == -ERESTARTSYS) | |
3649 | ret = -EINTR; | |
3650 | } | |
3651 | ||
3652 | io_cqring_add_event(req, ret); | |
3653 | if (ret < 0) | |
3654 | req_set_fail_links(req); | |
014db007 | 3655 | io_put_req(req); |
fddaface | 3656 | return 0; |
fddaface JA |
3657 | } |
3658 | ||
52de1fe1 JA |
3659 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) |
3660 | { | |
3661 | struct io_sr_msg *sr = &req->sr_msg; | |
3662 | struct iovec __user *uiov; | |
3663 | size_t iov_len; | |
3664 | int ret; | |
3665 | ||
3666 | ret = __copy_msghdr_from_user(&io->msg.msg, sr->msg, &io->msg.uaddr, | |
3667 | &uiov, &iov_len); | |
3668 | if (ret) | |
3669 | return ret; | |
3670 | ||
3671 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3672 | if (iov_len > 1) | |
3673 | return -EINVAL; | |
3674 | if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov))) | |
3675 | return -EFAULT; | |
3676 | sr->len = io->msg.iov[0].iov_len; | |
3677 | iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1, | |
3678 | sr->len); | |
3679 | io->msg.iov = NULL; | |
3680 | } else { | |
3681 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
3682 | &io->msg.iov, &io->msg.msg.msg_iter); | |
3683 | if (ret > 0) | |
3684 | ret = 0; | |
3685 | } | |
3686 | ||
3687 | return ret; | |
3688 | } | |
3689 | ||
3690 | #ifdef CONFIG_COMPAT | |
3691 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
3692 | struct io_async_ctx *io) | |
3693 | { | |
3694 | struct compat_msghdr __user *msg_compat; | |
3695 | struct io_sr_msg *sr = &req->sr_msg; | |
3696 | struct compat_iovec __user *uiov; | |
3697 | compat_uptr_t ptr; | |
3698 | compat_size_t len; | |
3699 | int ret; | |
3700 | ||
3701 | msg_compat = (struct compat_msghdr __user *) sr->msg; | |
3702 | ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr, | |
3703 | &ptr, &len); | |
3704 | if (ret) | |
3705 | return ret; | |
3706 | ||
3707 | uiov = compat_ptr(ptr); | |
3708 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3709 | compat_ssize_t clen; | |
3710 | ||
3711 | if (len > 1) | |
3712 | return -EINVAL; | |
3713 | if (!access_ok(uiov, sizeof(*uiov))) | |
3714 | return -EFAULT; | |
3715 | if (__get_user(clen, &uiov->iov_len)) | |
3716 | return -EFAULT; | |
3717 | if (clen < 0) | |
3718 | return -EINVAL; | |
3719 | sr->len = io->msg.iov[0].iov_len; | |
3720 | io->msg.iov = NULL; | |
3721 | } else { | |
3722 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
3723 | &io->msg.iov, | |
3724 | &io->msg.msg.msg_iter); | |
3725 | if (ret < 0) | |
3726 | return ret; | |
3727 | } | |
3728 | ||
3729 | return 0; | |
3730 | } | |
3731 | #endif | |
3732 | ||
3733 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) | |
3734 | { | |
3735 | io->msg.iov = io->msg.fast_iov; | |
3736 | ||
3737 | #ifdef CONFIG_COMPAT | |
3738 | if (req->ctx->compat) | |
3739 | return __io_compat_recvmsg_copy_hdr(req, io); | |
fddaface | 3740 | #endif |
52de1fe1 JA |
3741 | |
3742 | return __io_recvmsg_copy_hdr(req, io); | |
3743 | } | |
3744 | ||
bcda7baa JA |
3745 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
3746 | int *cflags, bool needs_lock) | |
3747 | { | |
3748 | struct io_sr_msg *sr = &req->sr_msg; | |
3749 | struct io_buffer *kbuf; | |
3750 | ||
3751 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
3752 | return NULL; | |
3753 | ||
3754 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
3755 | if (IS_ERR(kbuf)) | |
3756 | return kbuf; | |
3757 | ||
3758 | sr->kbuf = kbuf; | |
3759 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3760 | ||
3761 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
3762 | *cflags |= IORING_CQE_F_BUFFER; | |
3763 | return kbuf; | |
fddaface JA |
3764 | } |
3765 | ||
3529d8c2 JA |
3766 | static int io_recvmsg_prep(struct io_kiocb *req, |
3767 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 3768 | { |
e47293fd | 3769 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3770 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3771 | int ret; |
3529d8c2 JA |
3772 | |
3773 | sr->msg_flags = READ_ONCE(sqe->msg_flags); | |
3774 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
0b7b21e4 | 3775 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 3776 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 3777 | |
d8768362 JA |
3778 | #ifdef CONFIG_COMPAT |
3779 | if (req->ctx->compat) | |
3780 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3781 | #endif | |
3782 | ||
fddaface | 3783 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 3784 | return 0; |
5f798bea PB |
3785 | /* iovec is already imported */ |
3786 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3787 | return 0; | |
03b1230c | 3788 | |
52de1fe1 | 3789 | ret = io_recvmsg_copy_hdr(req, io); |
99bc4c38 PB |
3790 | if (!ret) |
3791 | req->flags |= REQ_F_NEED_CLEANUP; | |
3792 | return ret; | |
aa1fa28f JA |
3793 | } |
3794 | ||
014db007 | 3795 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3796 | { |
0b416c3e | 3797 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 3798 | struct socket *sock; |
52de1fe1 | 3799 | int ret, cflags = 0; |
03b1230c JA |
3800 | |
3801 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3802 | return -EINVAL; | |
3803 | ||
3804 | sock = sock_from_file(req->file, &ret); | |
3805 | if (sock) { | |
52de1fe1 | 3806 | struct io_buffer *kbuf; |
b7bb4f7d | 3807 | struct io_async_ctx io; |
03b1230c JA |
3808 | unsigned flags; |
3809 | ||
03b1230c | 3810 | if (req->io) { |
0b416c3e | 3811 | kmsg = &req->io->msg; |
b537916c | 3812 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3813 | /* if iov is set, it's allocated already */ |
3814 | if (!kmsg->iov) | |
3815 | kmsg->iov = kmsg->fast_iov; | |
3816 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3817 | } else { |
0b416c3e | 3818 | kmsg = &io.msg; |
b537916c | 3819 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 | 3820 | |
52de1fe1 | 3821 | ret = io_recvmsg_copy_hdr(req, &io); |
03b1230c | 3822 | if (ret) |
3529d8c2 | 3823 | return ret; |
03b1230c JA |
3824 | } |
3825 | ||
52de1fe1 JA |
3826 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3827 | if (IS_ERR(kbuf)) { | |
3828 | return PTR_ERR(kbuf); | |
3829 | } else if (kbuf) { | |
3830 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3831 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
3832 | 1, req->sr_msg.len); | |
3833 | } | |
3834 | ||
e47293fd JA |
3835 | flags = req->sr_msg.msg_flags; |
3836 | if (flags & MSG_DONTWAIT) | |
3837 | req->flags |= REQ_F_NOWAIT; | |
3838 | else if (force_nonblock) | |
3839 | flags |= MSG_DONTWAIT; | |
3840 | ||
3841 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, | |
3842 | kmsg->uaddr, flags); | |
02d27d89 PB |
3843 | if (force_nonblock && ret == -EAGAIN) |
3844 | return io_setup_async_msg(req, kmsg); | |
03b1230c JA |
3845 | if (ret == -ERESTARTSYS) |
3846 | ret = -EINTR; | |
3847 | } | |
3848 | ||
1e95081c | 3849 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3850 | kfree(kmsg->iov); |
99bc4c38 | 3851 | req->flags &= ~REQ_F_NEED_CLEANUP; |
52de1fe1 | 3852 | __io_cqring_add_event(req, ret, cflags); |
4e88d6e7 JA |
3853 | if (ret < 0) |
3854 | req_set_fail_links(req); | |
014db007 | 3855 | io_put_req(req); |
03b1230c | 3856 | return 0; |
0fa03c62 | 3857 | } |
5d17b4a4 | 3858 | |
014db007 | 3859 | static int io_recv(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3860 | { |
bcda7baa | 3861 | struct io_buffer *kbuf = NULL; |
fddaface | 3862 | struct socket *sock; |
bcda7baa | 3863 | int ret, cflags = 0; |
fddaface JA |
3864 | |
3865 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3866 | return -EINVAL; | |
3867 | ||
3868 | sock = sock_from_file(req->file, &ret); | |
3869 | if (sock) { | |
3870 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 3871 | void __user *buf = sr->buf; |
fddaface JA |
3872 | struct msghdr msg; |
3873 | struct iovec iov; | |
3874 | unsigned flags; | |
3875 | ||
bcda7baa JA |
3876 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3877 | if (IS_ERR(kbuf)) | |
3878 | return PTR_ERR(kbuf); | |
3879 | else if (kbuf) | |
3880 | buf = u64_to_user_ptr(kbuf->addr); | |
3881 | ||
3882 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 3883 | &msg.msg_iter); |
bcda7baa JA |
3884 | if (ret) { |
3885 | kfree(kbuf); | |
fddaface | 3886 | return ret; |
bcda7baa | 3887 | } |
fddaface | 3888 | |
bcda7baa | 3889 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
3890 | msg.msg_name = NULL; |
3891 | msg.msg_control = NULL; | |
3892 | msg.msg_controllen = 0; | |
3893 | msg.msg_namelen = 0; | |
3894 | msg.msg_iocb = NULL; | |
3895 | msg.msg_flags = 0; | |
3896 | ||
3897 | flags = req->sr_msg.msg_flags; | |
3898 | if (flags & MSG_DONTWAIT) | |
3899 | req->flags |= REQ_F_NOWAIT; | |
3900 | else if (force_nonblock) | |
3901 | flags |= MSG_DONTWAIT; | |
3902 | ||
0b7b21e4 | 3903 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
3904 | if (force_nonblock && ret == -EAGAIN) |
3905 | return -EAGAIN; | |
3906 | if (ret == -ERESTARTSYS) | |
3907 | ret = -EINTR; | |
3908 | } | |
3909 | ||
bcda7baa JA |
3910 | kfree(kbuf); |
3911 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3912 | __io_cqring_add_event(req, ret, cflags); | |
fddaface JA |
3913 | if (ret < 0) |
3914 | req_set_fail_links(req); | |
014db007 | 3915 | io_put_req(req); |
fddaface | 3916 | return 0; |
fddaface JA |
3917 | } |
3918 | ||
3529d8c2 | 3919 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 3920 | { |
8ed8d3c3 JA |
3921 | struct io_accept *accept = &req->accept; |
3922 | ||
17f2fe35 JA |
3923 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3924 | return -EINVAL; | |
8042d6ce | 3925 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
3926 | return -EINVAL; |
3927 | ||
d55e5f5b JA |
3928 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3929 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 3930 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 3931 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 3932 | return 0; |
8ed8d3c3 | 3933 | } |
17f2fe35 | 3934 | |
014db007 | 3935 | static int __io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 JA |
3936 | { |
3937 | struct io_accept *accept = &req->accept; | |
3938 | unsigned file_flags; | |
3939 | int ret; | |
3940 | ||
3941 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
3942 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, | |
09952e3e JA |
3943 | accept->addr_len, accept->flags, |
3944 | accept->nofile); | |
8ed8d3c3 | 3945 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 3946 | return -EAGAIN; |
8e3cca12 JA |
3947 | if (ret == -ERESTARTSYS) |
3948 | ret = -EINTR; | |
4e88d6e7 JA |
3949 | if (ret < 0) |
3950 | req_set_fail_links(req); | |
78e19bbe | 3951 | io_cqring_add_event(req, ret); |
014db007 | 3952 | io_put_req(req); |
17f2fe35 | 3953 | return 0; |
8ed8d3c3 JA |
3954 | } |
3955 | ||
3956 | static void io_accept_finish(struct io_wq_work **workptr) | |
3957 | { | |
3958 | struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work); | |
8ed8d3c3 JA |
3959 | |
3960 | if (io_req_cancelled(req)) | |
3961 | return; | |
014db007 | 3962 | __io_accept(req, false); |
e9fd9396 | 3963 | io_steal_work(req, workptr); |
8ed8d3c3 | 3964 | } |
8ed8d3c3 | 3965 | |
014db007 | 3966 | static int io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3967 | { |
8ed8d3c3 JA |
3968 | int ret; |
3969 | ||
014db007 | 3970 | ret = __io_accept(req, force_nonblock); |
8ed8d3c3 JA |
3971 | if (ret == -EAGAIN && force_nonblock) { |
3972 | req->work.func = io_accept_finish; | |
8ed8d3c3 JA |
3973 | return -EAGAIN; |
3974 | } | |
3975 | return 0; | |
0fa03c62 | 3976 | } |
5d17b4a4 | 3977 | |
3529d8c2 | 3978 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 3979 | { |
3529d8c2 JA |
3980 | struct io_connect *conn = &req->connect; |
3981 | struct io_async_ctx *io = req->io; | |
f499a021 | 3982 | |
3fbb51c1 JA |
3983 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3984 | return -EINVAL; | |
3985 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
3986 | return -EINVAL; | |
3987 | ||
3529d8c2 JA |
3988 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3989 | conn->addr_len = READ_ONCE(sqe->addr2); | |
3990 | ||
3991 | if (!io) | |
3992 | return 0; | |
3993 | ||
3994 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 3995 | &io->connect.address); |
f499a021 JA |
3996 | } |
3997 | ||
014db007 | 3998 | static int io_connect(struct io_kiocb *req, bool force_nonblock) |
f8e85cf2 | 3999 | { |
f499a021 | 4000 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4001 | unsigned file_flags; |
3fbb51c1 | 4002 | int ret; |
f8e85cf2 | 4003 | |
f499a021 JA |
4004 | if (req->io) { |
4005 | io = req->io; | |
4006 | } else { | |
3529d8c2 JA |
4007 | ret = move_addr_to_kernel(req->connect.addr, |
4008 | req->connect.addr_len, | |
4009 | &__io.connect.address); | |
f499a021 JA |
4010 | if (ret) |
4011 | goto out; | |
4012 | io = &__io; | |
4013 | } | |
4014 | ||
3fbb51c1 JA |
4015 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4016 | ||
4017 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4018 | req->connect.addr_len, file_flags); | |
87f80d62 | 4019 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4020 | if (req->io) |
4021 | return -EAGAIN; | |
4022 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4023 | ret = -ENOMEM; |
4024 | goto out; | |
4025 | } | |
b7bb4f7d | 4026 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4027 | return -EAGAIN; |
f499a021 | 4028 | } |
f8e85cf2 JA |
4029 | if (ret == -ERESTARTSYS) |
4030 | ret = -EINTR; | |
f499a021 | 4031 | out: |
4e88d6e7 JA |
4032 | if (ret < 0) |
4033 | req_set_fail_links(req); | |
f8e85cf2 | 4034 | io_cqring_add_event(req, ret); |
014db007 | 4035 | io_put_req(req); |
f8e85cf2 | 4036 | return 0; |
469956e8 Y |
4037 | } |
4038 | #else /* !CONFIG_NET */ | |
4039 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4040 | { | |
f8e85cf2 | 4041 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4042 | } |
4043 | ||
469956e8 Y |
4044 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
4045 | { | |
4046 | return -EOPNOTSUPP; | |
4047 | } | |
4048 | ||
4049 | static int io_send(struct io_kiocb *req, bool force_nonblock) | |
4050 | { | |
4051 | return -EOPNOTSUPP; | |
4052 | } | |
4053 | ||
4054 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4055 | const struct io_uring_sqe *sqe) | |
4056 | { | |
4057 | return -EOPNOTSUPP; | |
4058 | } | |
4059 | ||
4060 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) | |
4061 | { | |
4062 | return -EOPNOTSUPP; | |
4063 | } | |
4064 | ||
4065 | static int io_recv(struct io_kiocb *req, bool force_nonblock) | |
4066 | { | |
4067 | return -EOPNOTSUPP; | |
4068 | } | |
4069 | ||
4070 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4071 | { | |
4072 | return -EOPNOTSUPP; | |
4073 | } | |
4074 | ||
4075 | static int io_accept(struct io_kiocb *req, bool force_nonblock) | |
4076 | { | |
4077 | return -EOPNOTSUPP; | |
4078 | } | |
4079 | ||
4080 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4081 | { | |
4082 | return -EOPNOTSUPP; | |
4083 | } | |
4084 | ||
4085 | static int io_connect(struct io_kiocb *req, bool force_nonblock) | |
4086 | { | |
f8e85cf2 | 4087 | return -EOPNOTSUPP; |
f8e85cf2 | 4088 | } |
469956e8 | 4089 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4090 | |
d7718a9d JA |
4091 | struct io_poll_table { |
4092 | struct poll_table_struct pt; | |
4093 | struct io_kiocb *req; | |
4094 | int error; | |
4095 | }; | |
4096 | ||
4097 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
4098 | struct wait_queue_head *head) | |
4099 | { | |
4100 | if (unlikely(poll->head)) { | |
4101 | pt->error = -EINVAL; | |
4102 | return; | |
4103 | } | |
4104 | ||
4105 | pt->error = 0; | |
4106 | poll->head = head; | |
4107 | add_wait_queue(head, &poll->wait); | |
4108 | } | |
4109 | ||
4110 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4111 | struct poll_table_struct *p) | |
4112 | { | |
4113 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4114 | ||
4115 | __io_queue_proc(&pt->req->apoll->poll, pt, head); | |
4116 | } | |
4117 | ||
4118 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, | |
4119 | __poll_t mask, task_work_func_t func) | |
4120 | { | |
4121 | struct task_struct *tsk; | |
4122 | ||
4123 | /* for instances that support it check for an event match first: */ | |
4124 | if (mask && !(mask & poll->events)) | |
4125 | return 0; | |
4126 | ||
4127 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4128 | ||
4129 | list_del_init(&poll->wait.entry); | |
4130 | ||
4131 | tsk = req->task; | |
4132 | req->result = mask; | |
4133 | init_task_work(&req->task_work, func); | |
4134 | /* | |
4135 | * If this fails, then the task is exiting. If that is the case, then | |
4136 | * the exit check will ultimately cancel these work items. Hence we | |
4137 | * don't need to check here and handle it specifically. | |
4138 | */ | |
4139 | task_work_add(tsk, &req->task_work, true); | |
4140 | wake_up_process(tsk); | |
4141 | return 1; | |
4142 | } | |
4143 | ||
4144 | static void io_async_task_func(struct callback_head *cb) | |
4145 | { | |
4146 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4147 | struct async_poll *apoll = req->apoll; | |
4148 | struct io_ring_ctx *ctx = req->ctx; | |
4149 | ||
4150 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4151 | ||
4152 | WARN_ON_ONCE(!list_empty(&req->apoll->poll.wait.entry)); | |
4153 | ||
4154 | if (hash_hashed(&req->hash_node)) { | |
4155 | spin_lock_irq(&ctx->completion_lock); | |
4156 | hash_del(&req->hash_node); | |
4157 | spin_unlock_irq(&ctx->completion_lock); | |
4158 | } | |
4159 | ||
4160 | /* restore ->work in case we need to retry again */ | |
4161 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4162 | ||
4163 | __set_current_state(TASK_RUNNING); | |
4164 | mutex_lock(&ctx->uring_lock); | |
4165 | __io_queue_sqe(req, NULL); | |
4166 | mutex_unlock(&ctx->uring_lock); | |
4167 | ||
4168 | kfree(apoll); | |
4169 | } | |
4170 | ||
4171 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4172 | void *key) | |
4173 | { | |
4174 | struct io_kiocb *req = wait->private; | |
4175 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4176 | ||
4177 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4178 | key_to_poll(key)); | |
4179 | ||
4180 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4181 | } | |
4182 | ||
4183 | static void io_poll_req_insert(struct io_kiocb *req) | |
4184 | { | |
4185 | struct io_ring_ctx *ctx = req->ctx; | |
4186 | struct hlist_head *list; | |
4187 | ||
4188 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4189 | hlist_add_head(&req->hash_node, list); | |
4190 | } | |
4191 | ||
4192 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4193 | struct io_poll_iocb *poll, | |
4194 | struct io_poll_table *ipt, __poll_t mask, | |
4195 | wait_queue_func_t wake_func) | |
4196 | __acquires(&ctx->completion_lock) | |
4197 | { | |
4198 | struct io_ring_ctx *ctx = req->ctx; | |
4199 | bool cancel = false; | |
4200 | ||
4201 | poll->file = req->file; | |
4202 | poll->head = NULL; | |
4203 | poll->done = poll->canceled = false; | |
4204 | poll->events = mask; | |
4205 | ||
4206 | ipt->pt._key = mask; | |
4207 | ipt->req = req; | |
4208 | ipt->error = -EINVAL; | |
4209 | ||
4210 | INIT_LIST_HEAD(&poll->wait.entry); | |
4211 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4212 | poll->wait.private = req; | |
4213 | ||
4214 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; | |
4215 | ||
4216 | spin_lock_irq(&ctx->completion_lock); | |
4217 | if (likely(poll->head)) { | |
4218 | spin_lock(&poll->head->lock); | |
4219 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4220 | if (ipt->error) | |
4221 | cancel = true; | |
4222 | ipt->error = 0; | |
4223 | mask = 0; | |
4224 | } | |
4225 | if (mask || ipt->error) | |
4226 | list_del_init(&poll->wait.entry); | |
4227 | else if (cancel) | |
4228 | WRITE_ONCE(poll->canceled, true); | |
4229 | else if (!poll->done) /* actually waiting for an event */ | |
4230 | io_poll_req_insert(req); | |
4231 | spin_unlock(&poll->head->lock); | |
4232 | } | |
4233 | ||
4234 | return mask; | |
4235 | } | |
4236 | ||
4237 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4238 | { | |
4239 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4240 | struct io_ring_ctx *ctx = req->ctx; | |
4241 | struct async_poll *apoll; | |
4242 | struct io_poll_table ipt; | |
4243 | __poll_t mask, ret; | |
4244 | ||
4245 | if (!req->file || !file_can_poll(req->file)) | |
4246 | return false; | |
4247 | if (req->flags & (REQ_F_MUST_PUNT | REQ_F_POLLED)) | |
4248 | return false; | |
4249 | if (!def->pollin && !def->pollout) | |
4250 | return false; | |
4251 | ||
4252 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4253 | if (unlikely(!apoll)) | |
4254 | return false; | |
4255 | ||
4256 | req->flags |= REQ_F_POLLED; | |
4257 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
4258 | ||
4259 | /* | |
4260 | * Don't need a reference here, as we're adding it to the task | |
4261 | * task_works list. If the task exits, the list is pruned. | |
4262 | */ | |
4263 | req->task = current; | |
4264 | req->apoll = apoll; | |
4265 | INIT_HLIST_NODE(&req->hash_node); | |
4266 | ||
8755d97a | 4267 | mask = 0; |
d7718a9d | 4268 | if (def->pollin) |
8755d97a | 4269 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4270 | if (def->pollout) |
4271 | mask |= POLLOUT | POLLWRNORM; | |
4272 | mask |= POLLERR | POLLPRI; | |
4273 | ||
4274 | ipt.pt._qproc = io_async_queue_proc; | |
4275 | ||
4276 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4277 | io_async_wake); | |
4278 | if (ret) { | |
4279 | ipt.error = 0; | |
4280 | apoll->poll.done = true; | |
4281 | spin_unlock_irq(&ctx->completion_lock); | |
4282 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
4283 | kfree(apoll); | |
4284 | return false; | |
4285 | } | |
4286 | spin_unlock_irq(&ctx->completion_lock); | |
4287 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4288 | apoll->poll.events); | |
4289 | return true; | |
4290 | } | |
4291 | ||
4292 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4293 | struct io_poll_iocb *poll) | |
221c5eb2 | 4294 | { |
b41e9852 | 4295 | bool do_complete = false; |
221c5eb2 JA |
4296 | |
4297 | spin_lock(&poll->head->lock); | |
4298 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4299 | if (!list_empty(&poll->wait.entry)) { |
4300 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4301 | do_complete = true; |
221c5eb2 JA |
4302 | } |
4303 | spin_unlock(&poll->head->lock); | |
d7718a9d JA |
4304 | return do_complete; |
4305 | } | |
4306 | ||
4307 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4308 | { | |
4309 | bool do_complete; | |
4310 | ||
4311 | if (req->opcode == IORING_OP_POLL_ADD) { | |
4312 | do_complete = __io_poll_remove_one(req, &req->poll); | |
4313 | } else { | |
4314 | /* non-poll requests have submit ref still */ | |
4315 | do_complete = __io_poll_remove_one(req, &req->apoll->poll); | |
4316 | if (do_complete) | |
4317 | io_put_req(req); | |
4318 | } | |
4319 | ||
78076bb6 | 4320 | hash_del(&req->hash_node); |
d7718a9d | 4321 | |
b41e9852 JA |
4322 | if (do_complete) { |
4323 | io_cqring_fill_event(req, -ECANCELED); | |
4324 | io_commit_cqring(req->ctx); | |
4325 | req->flags |= REQ_F_COMP_LOCKED; | |
4326 | io_put_req(req); | |
4327 | } | |
4328 | ||
4329 | return do_complete; | |
221c5eb2 JA |
4330 | } |
4331 | ||
4332 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4333 | { | |
78076bb6 | 4334 | struct hlist_node *tmp; |
221c5eb2 | 4335 | struct io_kiocb *req; |
78076bb6 | 4336 | int i; |
221c5eb2 JA |
4337 | |
4338 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4339 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4340 | struct hlist_head *list; | |
4341 | ||
4342 | list = &ctx->cancel_hash[i]; | |
4343 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
4344 | io_poll_remove_one(req); | |
221c5eb2 JA |
4345 | } |
4346 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 JA |
4347 | |
4348 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4349 | } |
4350 | ||
47f46768 JA |
4351 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4352 | { | |
78076bb6 | 4353 | struct hlist_head *list; |
47f46768 JA |
4354 | struct io_kiocb *req; |
4355 | ||
78076bb6 JA |
4356 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4357 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4358 | if (sqe_addr != req->user_data) |
4359 | continue; | |
4360 | if (io_poll_remove_one(req)) | |
eac406c6 | 4361 | return 0; |
b41e9852 | 4362 | return -EALREADY; |
47f46768 JA |
4363 | } |
4364 | ||
4365 | return -ENOENT; | |
4366 | } | |
4367 | ||
3529d8c2 JA |
4368 | static int io_poll_remove_prep(struct io_kiocb *req, |
4369 | const struct io_uring_sqe *sqe) | |
0969e783 | 4370 | { |
0969e783 JA |
4371 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4372 | return -EINVAL; | |
4373 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4374 | sqe->poll_events) | |
4375 | return -EINVAL; | |
4376 | ||
4377 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4378 | return 0; |
4379 | } | |
4380 | ||
221c5eb2 JA |
4381 | /* |
4382 | * Find a running poll command that matches one specified in sqe->addr, | |
4383 | * and remove it if found. | |
4384 | */ | |
fc4df999 | 4385 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4386 | { |
4387 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4388 | u64 addr; |
47f46768 | 4389 | int ret; |
221c5eb2 | 4390 | |
0969e783 | 4391 | addr = req->poll.addr; |
221c5eb2 | 4392 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4393 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4394 | spin_unlock_irq(&ctx->completion_lock); |
4395 | ||
78e19bbe | 4396 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
4397 | if (ret < 0) |
4398 | req_set_fail_links(req); | |
e65ef56d | 4399 | io_put_req(req); |
221c5eb2 JA |
4400 | return 0; |
4401 | } | |
4402 | ||
b0dd8a41 | 4403 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) |
221c5eb2 | 4404 | { |
a197f664 JL |
4405 | struct io_ring_ctx *ctx = req->ctx; |
4406 | ||
8c838788 | 4407 | req->poll.done = true; |
b0a20349 | 4408 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); |
8c838788 | 4409 | io_commit_cqring(ctx); |
221c5eb2 JA |
4410 | } |
4411 | ||
b41e9852 | 4412 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) |
221c5eb2 | 4413 | { |
221c5eb2 | 4414 | struct io_ring_ctx *ctx = req->ctx; |
a6ba632d JA |
4415 | struct io_poll_iocb *poll = &req->poll; |
4416 | ||
4417 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4418 | struct poll_table_struct pt = { ._key = poll->events }; | |
4419 | ||
4420 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4421 | } | |
221c5eb2 | 4422 | |
221c5eb2 | 4423 | spin_lock_irq(&ctx->completion_lock); |
a6ba632d JA |
4424 | if (!req->result && !READ_ONCE(poll->canceled)) { |
4425 | add_wait_queue(poll->head, &poll->wait); | |
4426 | spin_unlock_irq(&ctx->completion_lock); | |
4427 | return; | |
4428 | } | |
78076bb6 | 4429 | hash_del(&req->hash_node); |
b41e9852 JA |
4430 | io_poll_complete(req, req->result, 0); |
4431 | req->flags |= REQ_F_COMP_LOCKED; | |
4432 | io_put_req_find_next(req, nxt); | |
221c5eb2 JA |
4433 | spin_unlock_irq(&ctx->completion_lock); |
4434 | ||
8c838788 | 4435 | io_cqring_ev_posted(ctx); |
221c5eb2 JA |
4436 | } |
4437 | ||
b41e9852 | 4438 | static void io_poll_task_func(struct callback_head *cb) |
e94f141b | 4439 | { |
b41e9852 JA |
4440 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
4441 | struct io_kiocb *nxt = NULL; | |
e94f141b | 4442 | |
b41e9852 | 4443 | io_poll_task_handler(req, &nxt); |
d7718a9d JA |
4444 | if (nxt) { |
4445 | struct io_ring_ctx *ctx = nxt->ctx; | |
e94f141b | 4446 | |
d7718a9d | 4447 | mutex_lock(&ctx->uring_lock); |
b41e9852 | 4448 | __io_queue_sqe(nxt, NULL); |
d7718a9d | 4449 | mutex_unlock(&ctx->uring_lock); |
e94f141b | 4450 | } |
f0b493e6 JA |
4451 | } |
4452 | ||
221c5eb2 JA |
4453 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4454 | void *key) | |
4455 | { | |
c2f2eb7d JA |
4456 | struct io_kiocb *req = wait->private; |
4457 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4458 | |
d7718a9d | 4459 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4460 | } |
4461 | ||
221c5eb2 JA |
4462 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4463 | struct poll_table_struct *p) | |
4464 | { | |
4465 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4466 | ||
d7718a9d | 4467 | __io_queue_proc(&pt->req->poll, pt, head); |
eac406c6 JA |
4468 | } |
4469 | ||
3529d8c2 | 4470 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4471 | { |
4472 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4473 | u16 events; |
221c5eb2 JA |
4474 | |
4475 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4476 | return -EINVAL; | |
4477 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4478 | return -EINVAL; | |
09bb8394 JA |
4479 | if (!poll->file) |
4480 | return -EBADF; | |
221c5eb2 | 4481 | |
221c5eb2 JA |
4482 | events = READ_ONCE(sqe->poll_events); |
4483 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP; | |
b41e9852 | 4484 | |
d7718a9d JA |
4485 | /* |
4486 | * Don't need a reference here, as we're adding it to the task | |
4487 | * task_works list. If the task exits, the list is pruned. | |
4488 | */ | |
b41e9852 | 4489 | req->task = current; |
0969e783 JA |
4490 | return 0; |
4491 | } | |
4492 | ||
014db007 | 4493 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4494 | { |
4495 | struct io_poll_iocb *poll = &req->poll; | |
4496 | struct io_ring_ctx *ctx = req->ctx; | |
4497 | struct io_poll_table ipt; | |
0969e783 | 4498 | __poll_t mask; |
0969e783 | 4499 | |
78076bb6 | 4500 | INIT_HLIST_NODE(&req->hash_node); |
36703247 | 4501 | INIT_LIST_HEAD(&req->list); |
d7718a9d | 4502 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4503 | |
d7718a9d JA |
4504 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4505 | io_poll_wake); | |
221c5eb2 | 4506 | |
8c838788 | 4507 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4508 | ipt.error = 0; |
b0dd8a41 | 4509 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4510 | } |
221c5eb2 JA |
4511 | spin_unlock_irq(&ctx->completion_lock); |
4512 | ||
8c838788 JA |
4513 | if (mask) { |
4514 | io_cqring_ev_posted(ctx); | |
014db007 | 4515 | io_put_req(req); |
221c5eb2 | 4516 | } |
8c838788 | 4517 | return ipt.error; |
221c5eb2 JA |
4518 | } |
4519 | ||
5262f567 JA |
4520 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4521 | { | |
ad8a48ac JA |
4522 | struct io_timeout_data *data = container_of(timer, |
4523 | struct io_timeout_data, timer); | |
4524 | struct io_kiocb *req = data->req; | |
4525 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4526 | unsigned long flags; |
4527 | ||
5262f567 JA |
4528 | atomic_inc(&ctx->cq_timeouts); |
4529 | ||
4530 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4531 | /* |
11365043 JA |
4532 | * We could be racing with timeout deletion. If the list is empty, |
4533 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4534 | */ |
842f9612 | 4535 | if (!list_empty(&req->list)) { |
11365043 | 4536 | struct io_kiocb *prev; |
5262f567 | 4537 | |
11365043 JA |
4538 | /* |
4539 | * Adjust the reqs sequence before the current one because it | |
d195a66e | 4540 | * will consume a slot in the cq_ring and the cq_tail |
11365043 JA |
4541 | * pointer will be increased, otherwise other timeout reqs may |
4542 | * return in advance without waiting for enough wait_nr. | |
4543 | */ | |
4544 | prev = req; | |
4545 | list_for_each_entry_continue_reverse(prev, &ctx->timeout_list, list) | |
4546 | prev->sequence++; | |
11365043 | 4547 | list_del_init(&req->list); |
11365043 | 4548 | } |
5262f567 | 4549 | |
78e19bbe | 4550 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4551 | io_commit_cqring(ctx); |
4552 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4553 | ||
4554 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4555 | req_set_fail_links(req); |
5262f567 JA |
4556 | io_put_req(req); |
4557 | return HRTIMER_NORESTART; | |
4558 | } | |
4559 | ||
47f46768 JA |
4560 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
4561 | { | |
4562 | struct io_kiocb *req; | |
4563 | int ret = -ENOENT; | |
4564 | ||
4565 | list_for_each_entry(req, &ctx->timeout_list, list) { | |
4566 | if (user_data == req->user_data) { | |
4567 | list_del_init(&req->list); | |
4568 | ret = 0; | |
4569 | break; | |
4570 | } | |
4571 | } | |
4572 | ||
4573 | if (ret == -ENOENT) | |
4574 | return ret; | |
4575 | ||
2d28390a | 4576 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
4577 | if (ret == -1) |
4578 | return -EALREADY; | |
4579 | ||
4e88d6e7 | 4580 | req_set_fail_links(req); |
47f46768 JA |
4581 | io_cqring_fill_event(req, -ECANCELED); |
4582 | io_put_req(req); | |
4583 | return 0; | |
4584 | } | |
4585 | ||
3529d8c2 JA |
4586 | static int io_timeout_remove_prep(struct io_kiocb *req, |
4587 | const struct io_uring_sqe *sqe) | |
b29472ee | 4588 | { |
b29472ee JA |
4589 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4590 | return -EINVAL; | |
4591 | if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len) | |
4592 | return -EINVAL; | |
4593 | ||
4594 | req->timeout.addr = READ_ONCE(sqe->addr); | |
4595 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
4596 | if (req->timeout.flags) | |
4597 | return -EINVAL; | |
4598 | ||
b29472ee JA |
4599 | return 0; |
4600 | } | |
4601 | ||
11365043 JA |
4602 | /* |
4603 | * Remove or update an existing timeout command | |
4604 | */ | |
fc4df999 | 4605 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
4606 | { |
4607 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 4608 | int ret; |
11365043 | 4609 | |
11365043 | 4610 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 4611 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 4612 | |
47f46768 | 4613 | io_cqring_fill_event(req, ret); |
11365043 JA |
4614 | io_commit_cqring(ctx); |
4615 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 4616 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
4617 | if (ret < 0) |
4618 | req_set_fail_links(req); | |
ec9c02ad | 4619 | io_put_req(req); |
11365043 | 4620 | return 0; |
5262f567 JA |
4621 | } |
4622 | ||
3529d8c2 | 4623 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 4624 | bool is_timeout_link) |
5262f567 | 4625 | { |
ad8a48ac | 4626 | struct io_timeout_data *data; |
a41525ab | 4627 | unsigned flags; |
5262f567 | 4628 | |
ad8a48ac | 4629 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 4630 | return -EINVAL; |
ad8a48ac | 4631 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 4632 | return -EINVAL; |
2d28390a JA |
4633 | if (sqe->off && is_timeout_link) |
4634 | return -EINVAL; | |
a41525ab JA |
4635 | flags = READ_ONCE(sqe->timeout_flags); |
4636 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 4637 | return -EINVAL; |
bdf20073 | 4638 | |
26a61679 JA |
4639 | req->timeout.count = READ_ONCE(sqe->off); |
4640 | ||
3529d8c2 | 4641 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
4642 | return -ENOMEM; |
4643 | ||
4644 | data = &req->io->timeout; | |
ad8a48ac | 4645 | data->req = req; |
ad8a48ac JA |
4646 | req->flags |= REQ_F_TIMEOUT; |
4647 | ||
4648 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
4649 | return -EFAULT; |
4650 | ||
11365043 | 4651 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 4652 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 4653 | else |
ad8a48ac | 4654 | data->mode = HRTIMER_MODE_REL; |
11365043 | 4655 | |
ad8a48ac JA |
4656 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
4657 | return 0; | |
4658 | } | |
4659 | ||
fc4df999 | 4660 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac JA |
4661 | { |
4662 | unsigned count; | |
4663 | struct io_ring_ctx *ctx = req->ctx; | |
4664 | struct io_timeout_data *data; | |
4665 | struct list_head *entry; | |
4666 | unsigned span = 0; | |
ad8a48ac | 4667 | |
2d28390a | 4668 | data = &req->io->timeout; |
93bd25bb | 4669 | |
5262f567 JA |
4670 | /* |
4671 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
4672 | * timeout event to be satisfied. If it isn't set, then this is |
4673 | * a pure timeout request, sequence isn't used. | |
5262f567 | 4674 | */ |
26a61679 | 4675 | count = req->timeout.count; |
93bd25bb JA |
4676 | if (!count) { |
4677 | req->flags |= REQ_F_TIMEOUT_NOSEQ; | |
4678 | spin_lock_irq(&ctx->completion_lock); | |
4679 | entry = ctx->timeout_list.prev; | |
4680 | goto add; | |
4681 | } | |
5262f567 JA |
4682 | |
4683 | req->sequence = ctx->cached_sq_head + count - 1; | |
2d28390a | 4684 | data->seq_offset = count; |
5262f567 JA |
4685 | |
4686 | /* | |
4687 | * Insertion sort, ensuring the first entry in the list is always | |
4688 | * the one we need first. | |
4689 | */ | |
5262f567 JA |
4690 | spin_lock_irq(&ctx->completion_lock); |
4691 | list_for_each_prev(entry, &ctx->timeout_list) { | |
4692 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); | |
5da0fb1a | 4693 | unsigned nxt_sq_head; |
4694 | long long tmp, tmp_nxt; | |
2d28390a | 4695 | u32 nxt_offset = nxt->io->timeout.seq_offset; |
5262f567 | 4696 | |
93bd25bb JA |
4697 | if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) |
4698 | continue; | |
4699 | ||
5da0fb1a | 4700 | /* |
4701 | * Since cached_sq_head + count - 1 can overflow, use type long | |
4702 | * long to store it. | |
4703 | */ | |
4704 | tmp = (long long)ctx->cached_sq_head + count - 1; | |
cc42e0ac PB |
4705 | nxt_sq_head = nxt->sequence - nxt_offset + 1; |
4706 | tmp_nxt = (long long)nxt_sq_head + nxt_offset - 1; | |
5da0fb1a | 4707 | |
4708 | /* | |
4709 | * cached_sq_head may overflow, and it will never overflow twice | |
4710 | * once there is some timeout req still be valid. | |
4711 | */ | |
4712 | if (ctx->cached_sq_head < nxt_sq_head) | |
8b07a65a | 4713 | tmp += UINT_MAX; |
5da0fb1a | 4714 | |
a1f58ba4 | 4715 | if (tmp > tmp_nxt) |
5262f567 | 4716 | break; |
a1f58ba4 | 4717 | |
4718 | /* | |
4719 | * Sequence of reqs after the insert one and itself should | |
4720 | * be adjusted because each timeout req consumes a slot. | |
4721 | */ | |
4722 | span++; | |
4723 | nxt->sequence++; | |
5262f567 | 4724 | } |
a1f58ba4 | 4725 | req->sequence -= span; |
93bd25bb | 4726 | add: |
5262f567 | 4727 | list_add(&req->list, entry); |
ad8a48ac JA |
4728 | data->timer.function = io_timeout_fn; |
4729 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 4730 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
4731 | return 0; |
4732 | } | |
5262f567 | 4733 | |
62755e35 JA |
4734 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
4735 | { | |
4736 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
4737 | ||
4738 | return req->user_data == (unsigned long) data; | |
4739 | } | |
4740 | ||
e977d6d3 | 4741 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 4742 | { |
62755e35 | 4743 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
4744 | int ret = 0; |
4745 | ||
62755e35 JA |
4746 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr); |
4747 | switch (cancel_ret) { | |
4748 | case IO_WQ_CANCEL_OK: | |
4749 | ret = 0; | |
4750 | break; | |
4751 | case IO_WQ_CANCEL_RUNNING: | |
4752 | ret = -EALREADY; | |
4753 | break; | |
4754 | case IO_WQ_CANCEL_NOTFOUND: | |
4755 | ret = -ENOENT; | |
4756 | break; | |
4757 | } | |
4758 | ||
e977d6d3 JA |
4759 | return ret; |
4760 | } | |
4761 | ||
47f46768 JA |
4762 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
4763 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 4764 | int success_ret) |
47f46768 JA |
4765 | { |
4766 | unsigned long flags; | |
4767 | int ret; | |
4768 | ||
4769 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
4770 | if (ret != -ENOENT) { | |
4771 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4772 | goto done; | |
4773 | } | |
4774 | ||
4775 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4776 | ret = io_timeout_cancel(ctx, sqe_addr); | |
4777 | if (ret != -ENOENT) | |
4778 | goto done; | |
4779 | ret = io_poll_cancel(ctx, sqe_addr); | |
4780 | done: | |
b0dd8a41 JA |
4781 | if (!ret) |
4782 | ret = success_ret; | |
47f46768 JA |
4783 | io_cqring_fill_event(req, ret); |
4784 | io_commit_cqring(ctx); | |
4785 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4786 | io_cqring_ev_posted(ctx); | |
4787 | ||
4e88d6e7 JA |
4788 | if (ret < 0) |
4789 | req_set_fail_links(req); | |
014db007 | 4790 | io_put_req(req); |
47f46768 JA |
4791 | } |
4792 | ||
3529d8c2 JA |
4793 | static int io_async_cancel_prep(struct io_kiocb *req, |
4794 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 4795 | { |
fbf23849 | 4796 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 JA |
4797 | return -EINVAL; |
4798 | if (sqe->flags || sqe->ioprio || sqe->off || sqe->len || | |
4799 | sqe->cancel_flags) | |
4800 | return -EINVAL; | |
4801 | ||
fbf23849 JA |
4802 | req->cancel.addr = READ_ONCE(sqe->addr); |
4803 | return 0; | |
4804 | } | |
4805 | ||
014db007 | 4806 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
4807 | { |
4808 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 4809 | |
014db007 | 4810 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
4811 | return 0; |
4812 | } | |
4813 | ||
05f3fb3c JA |
4814 | static int io_files_update_prep(struct io_kiocb *req, |
4815 | const struct io_uring_sqe *sqe) | |
4816 | { | |
4817 | if (sqe->flags || sqe->ioprio || sqe->rw_flags) | |
4818 | return -EINVAL; | |
4819 | ||
4820 | req->files_update.offset = READ_ONCE(sqe->off); | |
4821 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
4822 | if (!req->files_update.nr_args) | |
4823 | return -EINVAL; | |
4824 | req->files_update.arg = READ_ONCE(sqe->addr); | |
4825 | return 0; | |
4826 | } | |
4827 | ||
4828 | static int io_files_update(struct io_kiocb *req, bool force_nonblock) | |
fbf23849 JA |
4829 | { |
4830 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
4831 | struct io_uring_files_update up; |
4832 | int ret; | |
fbf23849 | 4833 | |
f86cd20c | 4834 | if (force_nonblock) |
05f3fb3c | 4835 | return -EAGAIN; |
05f3fb3c JA |
4836 | |
4837 | up.offset = req->files_update.offset; | |
4838 | up.fds = req->files_update.arg; | |
4839 | ||
4840 | mutex_lock(&ctx->uring_lock); | |
4841 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
4842 | mutex_unlock(&ctx->uring_lock); | |
4843 | ||
4844 | if (ret < 0) | |
4845 | req_set_fail_links(req); | |
4846 | io_cqring_add_event(req, ret); | |
4847 | io_put_req(req); | |
5262f567 JA |
4848 | return 0; |
4849 | } | |
4850 | ||
3529d8c2 JA |
4851 | static int io_req_defer_prep(struct io_kiocb *req, |
4852 | const struct io_uring_sqe *sqe) | |
f67676d1 | 4853 | { |
e781573e | 4854 | ssize_t ret = 0; |
f67676d1 | 4855 | |
f1d96a8f PB |
4856 | if (!sqe) |
4857 | return 0; | |
4858 | ||
f86cd20c JA |
4859 | if (io_op_defs[req->opcode].file_table) { |
4860 | ret = io_grab_files(req); | |
4861 | if (unlikely(ret)) | |
4862 | return ret; | |
4863 | } | |
4864 | ||
cccf0ee8 JA |
4865 | io_req_work_grab_env(req, &io_op_defs[req->opcode]); |
4866 | ||
d625c6ee | 4867 | switch (req->opcode) { |
e781573e JA |
4868 | case IORING_OP_NOP: |
4869 | break; | |
f67676d1 JA |
4870 | case IORING_OP_READV: |
4871 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 4872 | case IORING_OP_READ: |
3529d8c2 | 4873 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
4874 | break; |
4875 | case IORING_OP_WRITEV: | |
4876 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 4877 | case IORING_OP_WRITE: |
3529d8c2 | 4878 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 4879 | break; |
0969e783 | 4880 | case IORING_OP_POLL_ADD: |
3529d8c2 | 4881 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
4882 | break; |
4883 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 4884 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 4885 | break; |
8ed8d3c3 | 4886 | case IORING_OP_FSYNC: |
3529d8c2 | 4887 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
4888 | break; |
4889 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 4890 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 4891 | break; |
03b1230c | 4892 | case IORING_OP_SENDMSG: |
fddaface | 4893 | case IORING_OP_SEND: |
3529d8c2 | 4894 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
4895 | break; |
4896 | case IORING_OP_RECVMSG: | |
fddaface | 4897 | case IORING_OP_RECV: |
3529d8c2 | 4898 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 4899 | break; |
f499a021 | 4900 | case IORING_OP_CONNECT: |
3529d8c2 | 4901 | ret = io_connect_prep(req, sqe); |
f499a021 | 4902 | break; |
2d28390a | 4903 | case IORING_OP_TIMEOUT: |
3529d8c2 | 4904 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 4905 | break; |
b29472ee | 4906 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 4907 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 4908 | break; |
fbf23849 | 4909 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 4910 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 4911 | break; |
2d28390a | 4912 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 4913 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 4914 | break; |
8ed8d3c3 | 4915 | case IORING_OP_ACCEPT: |
3529d8c2 | 4916 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 4917 | break; |
d63d1b5e JA |
4918 | case IORING_OP_FALLOCATE: |
4919 | ret = io_fallocate_prep(req, sqe); | |
4920 | break; | |
15b71abe JA |
4921 | case IORING_OP_OPENAT: |
4922 | ret = io_openat_prep(req, sqe); | |
4923 | break; | |
b5dba59e JA |
4924 | case IORING_OP_CLOSE: |
4925 | ret = io_close_prep(req, sqe); | |
4926 | break; | |
05f3fb3c JA |
4927 | case IORING_OP_FILES_UPDATE: |
4928 | ret = io_files_update_prep(req, sqe); | |
4929 | break; | |
eddc7ef5 JA |
4930 | case IORING_OP_STATX: |
4931 | ret = io_statx_prep(req, sqe); | |
4932 | break; | |
4840e418 JA |
4933 | case IORING_OP_FADVISE: |
4934 | ret = io_fadvise_prep(req, sqe); | |
4935 | break; | |
c1ca757b JA |
4936 | case IORING_OP_MADVISE: |
4937 | ret = io_madvise_prep(req, sqe); | |
4938 | break; | |
cebdb986 JA |
4939 | case IORING_OP_OPENAT2: |
4940 | ret = io_openat2_prep(req, sqe); | |
4941 | break; | |
3e4827b0 JA |
4942 | case IORING_OP_EPOLL_CTL: |
4943 | ret = io_epoll_ctl_prep(req, sqe); | |
4944 | break; | |
7d67af2c PB |
4945 | case IORING_OP_SPLICE: |
4946 | ret = io_splice_prep(req, sqe); | |
4947 | break; | |
ddf0322d JA |
4948 | case IORING_OP_PROVIDE_BUFFERS: |
4949 | ret = io_provide_buffers_prep(req, sqe); | |
4950 | break; | |
067524e9 JA |
4951 | case IORING_OP_REMOVE_BUFFERS: |
4952 | ret = io_remove_buffers_prep(req, sqe); | |
4953 | break; | |
f67676d1 | 4954 | default: |
e781573e JA |
4955 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
4956 | req->opcode); | |
4957 | ret = -EINVAL; | |
b7bb4f7d | 4958 | break; |
f67676d1 JA |
4959 | } |
4960 | ||
b7bb4f7d | 4961 | return ret; |
f67676d1 JA |
4962 | } |
4963 | ||
3529d8c2 | 4964 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 4965 | { |
a197f664 | 4966 | struct io_ring_ctx *ctx = req->ctx; |
f67676d1 | 4967 | int ret; |
de0617e4 | 4968 | |
9d858b21 BL |
4969 | /* Still need defer if there is pending req in defer list. */ |
4970 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) | |
de0617e4 JA |
4971 | return 0; |
4972 | ||
3529d8c2 | 4973 | if (!req->io && io_alloc_async_ctx(req)) |
de0617e4 JA |
4974 | return -EAGAIN; |
4975 | ||
3529d8c2 | 4976 | ret = io_req_defer_prep(req, sqe); |
b7bb4f7d | 4977 | if (ret < 0) |
2d28390a | 4978 | return ret; |
2d28390a | 4979 | |
de0617e4 | 4980 | spin_lock_irq(&ctx->completion_lock); |
9d858b21 | 4981 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { |
de0617e4 | 4982 | spin_unlock_irq(&ctx->completion_lock); |
de0617e4 JA |
4983 | return 0; |
4984 | } | |
4985 | ||
915967f6 | 4986 | trace_io_uring_defer(ctx, req, req->user_data); |
de0617e4 JA |
4987 | list_add_tail(&req->list, &ctx->defer_list); |
4988 | spin_unlock_irq(&ctx->completion_lock); | |
4989 | return -EIOCBQUEUED; | |
4990 | } | |
4991 | ||
99bc4c38 PB |
4992 | static void io_cleanup_req(struct io_kiocb *req) |
4993 | { | |
4994 | struct io_async_ctx *io = req->io; | |
4995 | ||
4996 | switch (req->opcode) { | |
4997 | case IORING_OP_READV: | |
4998 | case IORING_OP_READ_FIXED: | |
4999 | case IORING_OP_READ: | |
bcda7baa JA |
5000 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5001 | kfree((void *)(unsigned long)req->rw.addr); | |
5002 | /* fallthrough */ | |
99bc4c38 PB |
5003 | case IORING_OP_WRITEV: |
5004 | case IORING_OP_WRITE_FIXED: | |
5005 | case IORING_OP_WRITE: | |
5006 | if (io->rw.iov != io->rw.fast_iov) | |
5007 | kfree(io->rw.iov); | |
5008 | break; | |
99bc4c38 | 5009 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5010 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5011 | kfree(req->sr_msg.kbuf); | |
5012 | /* fallthrough */ | |
5013 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5014 | if (io->msg.iov != io->msg.fast_iov) |
5015 | kfree(io->msg.iov); | |
5016 | break; | |
bcda7baa JA |
5017 | case IORING_OP_RECV: |
5018 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5019 | kfree(req->sr_msg.kbuf); | |
5020 | break; | |
8fef80bf PB |
5021 | case IORING_OP_OPENAT: |
5022 | case IORING_OP_OPENAT2: | |
5023 | case IORING_OP_STATX: | |
5024 | putname(req->open.filename); | |
5025 | break; | |
7d67af2c PB |
5026 | case IORING_OP_SPLICE: |
5027 | io_put_file(req, req->splice.file_in, | |
5028 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5029 | break; | |
99bc4c38 PB |
5030 | } |
5031 | ||
5032 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5033 | } | |
5034 | ||
3529d8c2 | 5035 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
014db007 | 5036 | bool force_nonblock) |
2b188cc1 | 5037 | { |
a197f664 | 5038 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5039 | int ret; |
2b188cc1 | 5040 | |
d625c6ee | 5041 | switch (req->opcode) { |
2b188cc1 | 5042 | case IORING_OP_NOP: |
78e19bbe | 5043 | ret = io_nop(req); |
2b188cc1 JA |
5044 | break; |
5045 | case IORING_OP_READV: | |
edafccee | 5046 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5047 | case IORING_OP_READ: |
3529d8c2 JA |
5048 | if (sqe) { |
5049 | ret = io_read_prep(req, sqe, force_nonblock); | |
5050 | if (ret < 0) | |
5051 | break; | |
5052 | } | |
014db007 | 5053 | ret = io_read(req, force_nonblock); |
edafccee | 5054 | break; |
3529d8c2 | 5055 | case IORING_OP_WRITEV: |
edafccee | 5056 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5057 | case IORING_OP_WRITE: |
3529d8c2 JA |
5058 | if (sqe) { |
5059 | ret = io_write_prep(req, sqe, force_nonblock); | |
5060 | if (ret < 0) | |
5061 | break; | |
5062 | } | |
014db007 | 5063 | ret = io_write(req, force_nonblock); |
2b188cc1 | 5064 | break; |
c992fe29 | 5065 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5066 | if (sqe) { |
5067 | ret = io_prep_fsync(req, sqe); | |
5068 | if (ret < 0) | |
5069 | break; | |
5070 | } | |
014db007 | 5071 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5072 | break; |
221c5eb2 | 5073 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5074 | if (sqe) { |
5075 | ret = io_poll_add_prep(req, sqe); | |
5076 | if (ret) | |
5077 | break; | |
5078 | } | |
014db007 | 5079 | ret = io_poll_add(req); |
221c5eb2 JA |
5080 | break; |
5081 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5082 | if (sqe) { |
5083 | ret = io_poll_remove_prep(req, sqe); | |
5084 | if (ret < 0) | |
5085 | break; | |
5086 | } | |
fc4df999 | 5087 | ret = io_poll_remove(req); |
221c5eb2 | 5088 | break; |
5d17b4a4 | 5089 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5090 | if (sqe) { |
5091 | ret = io_prep_sfr(req, sqe); | |
5092 | if (ret < 0) | |
5093 | break; | |
5094 | } | |
014db007 | 5095 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5096 | break; |
0fa03c62 | 5097 | case IORING_OP_SENDMSG: |
fddaface | 5098 | case IORING_OP_SEND: |
3529d8c2 JA |
5099 | if (sqe) { |
5100 | ret = io_sendmsg_prep(req, sqe); | |
5101 | if (ret < 0) | |
5102 | break; | |
5103 | } | |
fddaface | 5104 | if (req->opcode == IORING_OP_SENDMSG) |
014db007 | 5105 | ret = io_sendmsg(req, force_nonblock); |
fddaface | 5106 | else |
014db007 | 5107 | ret = io_send(req, force_nonblock); |
0fa03c62 | 5108 | break; |
aa1fa28f | 5109 | case IORING_OP_RECVMSG: |
fddaface | 5110 | case IORING_OP_RECV: |
3529d8c2 JA |
5111 | if (sqe) { |
5112 | ret = io_recvmsg_prep(req, sqe); | |
5113 | if (ret) | |
5114 | break; | |
5115 | } | |
fddaface | 5116 | if (req->opcode == IORING_OP_RECVMSG) |
014db007 | 5117 | ret = io_recvmsg(req, force_nonblock); |
fddaface | 5118 | else |
014db007 | 5119 | ret = io_recv(req, force_nonblock); |
aa1fa28f | 5120 | break; |
5262f567 | 5121 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5122 | if (sqe) { |
5123 | ret = io_timeout_prep(req, sqe, false); | |
5124 | if (ret) | |
5125 | break; | |
5126 | } | |
fc4df999 | 5127 | ret = io_timeout(req); |
5262f567 | 5128 | break; |
11365043 | 5129 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5130 | if (sqe) { |
5131 | ret = io_timeout_remove_prep(req, sqe); | |
5132 | if (ret) | |
5133 | break; | |
5134 | } | |
fc4df999 | 5135 | ret = io_timeout_remove(req); |
11365043 | 5136 | break; |
17f2fe35 | 5137 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5138 | if (sqe) { |
5139 | ret = io_accept_prep(req, sqe); | |
5140 | if (ret) | |
5141 | break; | |
5142 | } | |
014db007 | 5143 | ret = io_accept(req, force_nonblock); |
17f2fe35 | 5144 | break; |
f8e85cf2 | 5145 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5146 | if (sqe) { |
5147 | ret = io_connect_prep(req, sqe); | |
5148 | if (ret) | |
5149 | break; | |
5150 | } | |
014db007 | 5151 | ret = io_connect(req, force_nonblock); |
f8e85cf2 | 5152 | break; |
62755e35 | 5153 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5154 | if (sqe) { |
5155 | ret = io_async_cancel_prep(req, sqe); | |
5156 | if (ret) | |
5157 | break; | |
5158 | } | |
014db007 | 5159 | ret = io_async_cancel(req); |
62755e35 | 5160 | break; |
d63d1b5e JA |
5161 | case IORING_OP_FALLOCATE: |
5162 | if (sqe) { | |
5163 | ret = io_fallocate_prep(req, sqe); | |
5164 | if (ret) | |
5165 | break; | |
5166 | } | |
014db007 | 5167 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5168 | break; |
15b71abe JA |
5169 | case IORING_OP_OPENAT: |
5170 | if (sqe) { | |
5171 | ret = io_openat_prep(req, sqe); | |
5172 | if (ret) | |
5173 | break; | |
5174 | } | |
014db007 | 5175 | ret = io_openat(req, force_nonblock); |
15b71abe | 5176 | break; |
b5dba59e JA |
5177 | case IORING_OP_CLOSE: |
5178 | if (sqe) { | |
5179 | ret = io_close_prep(req, sqe); | |
5180 | if (ret) | |
5181 | break; | |
5182 | } | |
014db007 | 5183 | ret = io_close(req, force_nonblock); |
b5dba59e | 5184 | break; |
05f3fb3c JA |
5185 | case IORING_OP_FILES_UPDATE: |
5186 | if (sqe) { | |
5187 | ret = io_files_update_prep(req, sqe); | |
5188 | if (ret) | |
5189 | break; | |
5190 | } | |
5191 | ret = io_files_update(req, force_nonblock); | |
5192 | break; | |
eddc7ef5 JA |
5193 | case IORING_OP_STATX: |
5194 | if (sqe) { | |
5195 | ret = io_statx_prep(req, sqe); | |
5196 | if (ret) | |
5197 | break; | |
5198 | } | |
014db007 | 5199 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5200 | break; |
4840e418 JA |
5201 | case IORING_OP_FADVISE: |
5202 | if (sqe) { | |
5203 | ret = io_fadvise_prep(req, sqe); | |
5204 | if (ret) | |
5205 | break; | |
5206 | } | |
014db007 | 5207 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5208 | break; |
c1ca757b JA |
5209 | case IORING_OP_MADVISE: |
5210 | if (sqe) { | |
5211 | ret = io_madvise_prep(req, sqe); | |
5212 | if (ret) | |
5213 | break; | |
5214 | } | |
014db007 | 5215 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5216 | break; |
cebdb986 JA |
5217 | case IORING_OP_OPENAT2: |
5218 | if (sqe) { | |
5219 | ret = io_openat2_prep(req, sqe); | |
5220 | if (ret) | |
5221 | break; | |
5222 | } | |
014db007 | 5223 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5224 | break; |
3e4827b0 JA |
5225 | case IORING_OP_EPOLL_CTL: |
5226 | if (sqe) { | |
5227 | ret = io_epoll_ctl_prep(req, sqe); | |
5228 | if (ret) | |
5229 | break; | |
5230 | } | |
014db007 | 5231 | ret = io_epoll_ctl(req, force_nonblock); |
3e4827b0 | 5232 | break; |
7d67af2c PB |
5233 | case IORING_OP_SPLICE: |
5234 | if (sqe) { | |
5235 | ret = io_splice_prep(req, sqe); | |
5236 | if (ret < 0) | |
5237 | break; | |
5238 | } | |
014db007 | 5239 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5240 | break; |
ddf0322d JA |
5241 | case IORING_OP_PROVIDE_BUFFERS: |
5242 | if (sqe) { | |
5243 | ret = io_provide_buffers_prep(req, sqe); | |
5244 | if (ret) | |
5245 | break; | |
5246 | } | |
5247 | ret = io_provide_buffers(req, force_nonblock); | |
5248 | break; | |
067524e9 JA |
5249 | case IORING_OP_REMOVE_BUFFERS: |
5250 | if (sqe) { | |
5251 | ret = io_remove_buffers_prep(req, sqe); | |
5252 | if (ret) | |
5253 | break; | |
5254 | } | |
5255 | ret = io_remove_buffers(req, force_nonblock); | |
3e4827b0 | 5256 | break; |
2b188cc1 JA |
5257 | default: |
5258 | ret = -EINVAL; | |
5259 | break; | |
5260 | } | |
5261 | ||
def596e9 JA |
5262 | if (ret) |
5263 | return ret; | |
5264 | ||
5265 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
11ba820b JA |
5266 | const bool in_async = io_wq_current_is_worker(); |
5267 | ||
9e645e11 | 5268 | if (req->result == -EAGAIN) |
def596e9 JA |
5269 | return -EAGAIN; |
5270 | ||
11ba820b JA |
5271 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5272 | if (in_async) | |
5273 | mutex_lock(&ctx->uring_lock); | |
5274 | ||
def596e9 | 5275 | io_iopoll_req_issued(req); |
11ba820b JA |
5276 | |
5277 | if (in_async) | |
5278 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5279 | } |
5280 | ||
5281 | return 0; | |
2b188cc1 JA |
5282 | } |
5283 | ||
561fb04a | 5284 | static void io_wq_submit_work(struct io_wq_work **workptr) |
2b188cc1 | 5285 | { |
561fb04a | 5286 | struct io_wq_work *work = *workptr; |
2b188cc1 | 5287 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
561fb04a | 5288 | int ret = 0; |
2b188cc1 | 5289 | |
0c9d5ccd JA |
5290 | /* if NO_CANCEL is set, we must still run the work */ |
5291 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5292 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5293 | ret = -ECANCELED; |
0c9d5ccd | 5294 | } |
31b51510 | 5295 | |
561fb04a | 5296 | if (!ret) { |
561fb04a | 5297 | do { |
014db007 | 5298 | ret = io_issue_sqe(req, NULL, false); |
561fb04a JA |
5299 | /* |
5300 | * We can get EAGAIN for polled IO even though we're | |
5301 | * forcing a sync submission from here, since we can't | |
5302 | * wait for request slots on the block side. | |
5303 | */ | |
5304 | if (ret != -EAGAIN) | |
5305 | break; | |
5306 | cond_resched(); | |
5307 | } while (1); | |
5308 | } | |
31b51510 | 5309 | |
561fb04a | 5310 | if (ret) { |
4e88d6e7 | 5311 | req_set_fail_links(req); |
78e19bbe | 5312 | io_cqring_add_event(req, ret); |
817869d2 | 5313 | io_put_req(req); |
edafccee | 5314 | } |
2b188cc1 | 5315 | |
e9fd9396 | 5316 | io_steal_work(req, workptr); |
2b188cc1 JA |
5317 | } |
5318 | ||
15b71abe | 5319 | static int io_req_needs_file(struct io_kiocb *req, int fd) |
9e3aa61a | 5320 | { |
d3656344 | 5321 | if (!io_op_defs[req->opcode].needs_file) |
9e3aa61a | 5322 | return 0; |
0b5faf6b | 5323 | if ((fd == -1 || fd == AT_FDCWD) && io_op_defs[req->opcode].fd_non_neg) |
d3656344 JA |
5324 | return 0; |
5325 | return 1; | |
09bb8394 JA |
5326 | } |
5327 | ||
65e19f54 JA |
5328 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5329 | int index) | |
5330 | { | |
5331 | struct fixed_file_table *table; | |
5332 | ||
05f3fb3c JA |
5333 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
5334 | return table->files[index & IORING_FILE_TABLE_MASK];; | |
65e19f54 JA |
5335 | } |
5336 | ||
8da11c19 PB |
5337 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5338 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5339 | { |
a197f664 | 5340 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5341 | struct file *file; |
09bb8394 | 5342 | |
8da11c19 | 5343 | if (fixed) { |
05f3fb3c | 5344 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5345 | (unsigned) fd >= ctx->nr_user_files)) |
5346 | return -EBADF; | |
b7620121 | 5347 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 PB |
5348 | file = io_file_from_index(ctx, fd); |
5349 | if (!file) | |
08a45173 | 5350 | return -EBADF; |
05589553 XW |
5351 | req->fixed_file_refs = ctx->file_data->cur_refs; |
5352 | percpu_ref_get(req->fixed_file_refs); | |
09bb8394 | 5353 | } else { |
c826bd7a | 5354 | trace_io_uring_file_get(ctx, fd); |
8da11c19 PB |
5355 | file = __io_file_get(state, fd); |
5356 | if (unlikely(!file)) | |
09bb8394 JA |
5357 | return -EBADF; |
5358 | } | |
5359 | ||
8da11c19 | 5360 | *out_file = file; |
09bb8394 JA |
5361 | return 0; |
5362 | } | |
5363 | ||
8da11c19 PB |
5364 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
5365 | const struct io_uring_sqe *sqe) | |
5366 | { | |
5367 | unsigned flags; | |
5368 | int fd; | |
5369 | bool fixed; | |
5370 | ||
5371 | flags = READ_ONCE(sqe->flags); | |
5372 | fd = READ_ONCE(sqe->fd); | |
5373 | ||
5374 | if (!io_req_needs_file(req, fd)) | |
5375 | return 0; | |
5376 | ||
5377 | fixed = (flags & IOSQE_FIXED_FILE); | |
5378 | if (unlikely(!fixed && req->needs_fixed_file)) | |
5379 | return -EBADF; | |
5380 | ||
5381 | return io_file_get(state, req, fd, &req->file, fixed); | |
5382 | } | |
5383 | ||
a197f664 | 5384 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5385 | { |
5386 | int ret = -EBADF; | |
a197f664 | 5387 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5388 | |
f86cd20c JA |
5389 | if (req->work.files) |
5390 | return 0; | |
b14cca0c | 5391 | if (!ctx->ring_file) |
b5dba59e JA |
5392 | return -EBADF; |
5393 | ||
fcb323cc JA |
5394 | rcu_read_lock(); |
5395 | spin_lock_irq(&ctx->inflight_lock); | |
5396 | /* | |
5397 | * We use the f_ops->flush() handler to ensure that we can flush | |
5398 | * out work accessing these files if the fd is closed. Check if | |
5399 | * the fd has changed since we started down this path, and disallow | |
5400 | * this operation if it has. | |
5401 | */ | |
b14cca0c | 5402 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5403 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5404 | req->flags |= REQ_F_INFLIGHT; | |
5405 | req->work.files = current->files; | |
5406 | ret = 0; | |
5407 | } | |
5408 | spin_unlock_irq(&ctx->inflight_lock); | |
5409 | rcu_read_unlock(); | |
5410 | ||
5411 | return ret; | |
5412 | } | |
5413 | ||
2665abfd | 5414 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5415 | { |
ad8a48ac JA |
5416 | struct io_timeout_data *data = container_of(timer, |
5417 | struct io_timeout_data, timer); | |
5418 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5419 | struct io_ring_ctx *ctx = req->ctx; |
5420 | struct io_kiocb *prev = NULL; | |
5421 | unsigned long flags; | |
2665abfd JA |
5422 | |
5423 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5424 | ||
5425 | /* | |
5426 | * We don't expect the list to be empty, that will only happen if we | |
5427 | * race with the completion of the linked work. | |
5428 | */ | |
4493233e PB |
5429 | if (!list_empty(&req->link_list)) { |
5430 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5431 | link_list); | |
5d960724 | 5432 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5433 | list_del_init(&req->link_list); |
5d960724 JA |
5434 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5435 | } else | |
76a46e06 | 5436 | prev = NULL; |
2665abfd JA |
5437 | } |
5438 | ||
5439 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5440 | ||
5441 | if (prev) { | |
4e88d6e7 | 5442 | req_set_fail_links(prev); |
014db007 | 5443 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5444 | io_put_req(prev); |
47f46768 JA |
5445 | } else { |
5446 | io_cqring_add_event(req, -ETIME); | |
5447 | io_put_req(req); | |
2665abfd | 5448 | } |
2665abfd JA |
5449 | return HRTIMER_NORESTART; |
5450 | } | |
5451 | ||
ad8a48ac | 5452 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5453 | { |
76a46e06 | 5454 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5455 | |
76a46e06 JA |
5456 | /* |
5457 | * If the list is now empty, then our linked request finished before | |
5458 | * we got a chance to setup the timer | |
5459 | */ | |
5460 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5461 | if (!list_empty(&req->link_list)) { |
2d28390a | 5462 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5463 | |
ad8a48ac JA |
5464 | data->timer.function = io_link_timeout_fn; |
5465 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5466 | data->mode); | |
2665abfd | 5467 | } |
76a46e06 | 5468 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5469 | |
2665abfd | 5470 | /* drop submission reference */ |
76a46e06 JA |
5471 | io_put_req(req); |
5472 | } | |
2665abfd | 5473 | |
ad8a48ac | 5474 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5475 | { |
5476 | struct io_kiocb *nxt; | |
5477 | ||
5478 | if (!(req->flags & REQ_F_LINK)) | |
5479 | return NULL; | |
d7718a9d JA |
5480 | /* for polled retry, if flag is set, we already went through here */ |
5481 | if (req->flags & REQ_F_POLLED) | |
5482 | return NULL; | |
2665abfd | 5483 | |
4493233e PB |
5484 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5485 | link_list); | |
d625c6ee | 5486 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5487 | return NULL; |
2665abfd | 5488 | |
76a46e06 | 5489 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5490 | return nxt; |
2665abfd JA |
5491 | } |
5492 | ||
3529d8c2 | 5493 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 5494 | { |
4a0a7a18 | 5495 | struct io_kiocb *linked_timeout; |
4bc4494e | 5496 | struct io_kiocb *nxt; |
193155c8 | 5497 | const struct cred *old_creds = NULL; |
e0c5c576 | 5498 | int ret; |
2b188cc1 | 5499 | |
4a0a7a18 JA |
5500 | again: |
5501 | linked_timeout = io_prep_linked_timeout(req); | |
5502 | ||
193155c8 JA |
5503 | if (req->work.creds && req->work.creds != current_cred()) { |
5504 | if (old_creds) | |
5505 | revert_creds(old_creds); | |
5506 | if (old_creds == req->work.creds) | |
5507 | old_creds = NULL; /* restored original creds */ | |
5508 | else | |
5509 | old_creds = override_creds(req->work.creds); | |
5510 | } | |
5511 | ||
014db007 | 5512 | ret = io_issue_sqe(req, sqe, true); |
491381ce JA |
5513 | |
5514 | /* | |
5515 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5516 | * doesn't support non-blocking read/write attempts | |
5517 | */ | |
5518 | if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) || | |
5519 | (req->flags & REQ_F_MUST_PUNT))) { | |
d7718a9d JA |
5520 | if (io_arm_poll_handler(req)) { |
5521 | if (linked_timeout) | |
5522 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5523 | goto exit; |
d7718a9d | 5524 | } |
86a761f8 | 5525 | punt: |
f86cd20c | 5526 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5527 | ret = io_grab_files(req); |
5528 | if (ret) | |
5529 | goto err; | |
2b188cc1 | 5530 | } |
bbad27b2 PB |
5531 | |
5532 | /* | |
5533 | * Queued up for async execution, worker will release | |
5534 | * submit reference when the iocb is actually submitted. | |
5535 | */ | |
5536 | io_queue_async_work(req); | |
4bc4494e | 5537 | goto exit; |
2b188cc1 | 5538 | } |
e65ef56d | 5539 | |
fcb323cc | 5540 | err: |
4bc4494e | 5541 | nxt = NULL; |
76a46e06 | 5542 | /* drop submission reference */ |
2a44f467 | 5543 | io_put_req_find_next(req, &nxt); |
e65ef56d | 5544 | |
f9bd67f6 | 5545 | if (linked_timeout) { |
76a46e06 | 5546 | if (!ret) |
f9bd67f6 | 5547 | io_queue_linked_timeout(linked_timeout); |
76a46e06 | 5548 | else |
f9bd67f6 | 5549 | io_put_req(linked_timeout); |
76a46e06 JA |
5550 | } |
5551 | ||
e65ef56d | 5552 | /* and drop final reference, if we failed */ |
9e645e11 | 5553 | if (ret) { |
78e19bbe | 5554 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5555 | req_set_fail_links(req); |
e65ef56d | 5556 | io_put_req(req); |
9e645e11 | 5557 | } |
4a0a7a18 JA |
5558 | if (nxt) { |
5559 | req = nxt; | |
86a761f8 PB |
5560 | |
5561 | if (req->flags & REQ_F_FORCE_ASYNC) | |
5562 | goto punt; | |
4a0a7a18 JA |
5563 | goto again; |
5564 | } | |
4bc4494e | 5565 | exit: |
193155c8 JA |
5566 | if (old_creds) |
5567 | revert_creds(old_creds); | |
2b188cc1 JA |
5568 | } |
5569 | ||
3529d8c2 | 5570 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
5571 | { |
5572 | int ret; | |
5573 | ||
3529d8c2 | 5574 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
5575 | if (ret) { |
5576 | if (ret != -EIOCBQUEUED) { | |
1118591a | 5577 | fail_req: |
78e19bbe | 5578 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5579 | req_set_fail_links(req); |
78e19bbe | 5580 | io_double_put_req(req); |
4fe2c963 | 5581 | } |
2550878f | 5582 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
1118591a PB |
5583 | ret = io_req_defer_prep(req, sqe); |
5584 | if (unlikely(ret < 0)) | |
5585 | goto fail_req; | |
ce35a47a JA |
5586 | /* |
5587 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
5588 | * to async execution. | |
5589 | */ | |
5590 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
5591 | io_queue_async_work(req); | |
5592 | } else { | |
3529d8c2 | 5593 | __io_queue_sqe(req, sqe); |
ce35a47a | 5594 | } |
4fe2c963 JL |
5595 | } |
5596 | ||
1b4a51b6 | 5597 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 5598 | { |
94ae5e77 | 5599 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
1b4a51b6 PB |
5600 | io_cqring_add_event(req, -ECANCELED); |
5601 | io_double_put_req(req); | |
5602 | } else | |
3529d8c2 | 5603 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
5604 | } |
5605 | ||
4e88d6e7 | 5606 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
bcda7baa JA |
5607 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ |
5608 | IOSQE_BUFFER_SELECT) | |
9e645e11 | 5609 | |
3529d8c2 JA |
5610 | static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
5611 | struct io_submit_state *state, struct io_kiocb **link) | |
9e645e11 | 5612 | { |
a197f664 | 5613 | struct io_ring_ctx *ctx = req->ctx; |
32fe525b | 5614 | unsigned int sqe_flags; |
75c6a039 | 5615 | int ret, id; |
9e645e11 | 5616 | |
32fe525b | 5617 | sqe_flags = READ_ONCE(sqe->flags); |
9e645e11 JA |
5618 | |
5619 | /* enforce forwards compatibility on users */ | |
32fe525b | 5620 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) { |
9e645e11 | 5621 | ret = -EINVAL; |
196be95c | 5622 | goto err_req; |
9e645e11 JA |
5623 | } |
5624 | ||
bcda7baa JA |
5625 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
5626 | !io_op_defs[req->opcode].buffer_select) { | |
5627 | ret = -EOPNOTSUPP; | |
5628 | goto err_req; | |
5629 | } | |
5630 | ||
75c6a039 JA |
5631 | id = READ_ONCE(sqe->personality); |
5632 | if (id) { | |
193155c8 JA |
5633 | req->work.creds = idr_find(&ctx->personality_idr, id); |
5634 | if (unlikely(!req->work.creds)) { | |
75c6a039 JA |
5635 | ret = -EINVAL; |
5636 | goto err_req; | |
5637 | } | |
193155c8 | 5638 | get_cred(req->work.creds); |
75c6a039 JA |
5639 | } |
5640 | ||
6b47ee6e | 5641 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
8da11c19 | 5642 | req->flags |= sqe_flags & (IOSQE_IO_DRAIN | IOSQE_IO_HARDLINK | |
bcda7baa JA |
5643 | IOSQE_ASYNC | IOSQE_FIXED_FILE | |
5644 | IOSQE_BUFFER_SELECT); | |
9e645e11 | 5645 | |
3529d8c2 | 5646 | ret = io_req_set_file(state, req, sqe); |
9e645e11 JA |
5647 | if (unlikely(ret)) { |
5648 | err_req: | |
78e19bbe JA |
5649 | io_cqring_add_event(req, ret); |
5650 | io_double_put_req(req); | |
2e6e1fde | 5651 | return false; |
9e645e11 JA |
5652 | } |
5653 | ||
9e645e11 JA |
5654 | /* |
5655 | * If we already have a head request, queue this one for async | |
5656 | * submittal once the head completes. If we don't have a head but | |
5657 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
5658 | * submitted sync once the chain is complete. If none of those | |
5659 | * conditions are true (normal request), then just queue it. | |
5660 | */ | |
5661 | if (*link) { | |
9d76377f | 5662 | struct io_kiocb *head = *link; |
4e88d6e7 | 5663 | |
8cdf2193 PB |
5664 | /* |
5665 | * Taking sequential execution of a link, draining both sides | |
5666 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
5667 | * requests in the link. So, it drains the head and the | |
5668 | * next after the link request. The last one is done via | |
5669 | * drain_next flag to persist the effect across calls. | |
5670 | */ | |
711be031 PB |
5671 | if (sqe_flags & IOSQE_IO_DRAIN) { |
5672 | head->flags |= REQ_F_IO_DRAIN; | |
5673 | ctx->drain_next = 1; | |
5674 | } | |
b7bb4f7d | 5675 | if (io_alloc_async_ctx(req)) { |
9e645e11 JA |
5676 | ret = -EAGAIN; |
5677 | goto err_req; | |
5678 | } | |
5679 | ||
3529d8c2 | 5680 | ret = io_req_defer_prep(req, sqe); |
2d28390a | 5681 | if (ret) { |
4e88d6e7 | 5682 | /* fail even hard links since we don't submit */ |
9d76377f | 5683 | head->flags |= REQ_F_FAIL_LINK; |
f67676d1 | 5684 | goto err_req; |
2d28390a | 5685 | } |
9d76377f PB |
5686 | trace_io_uring_link(ctx, req, head); |
5687 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
5688 | |
5689 | /* last request of a link, enqueue the link */ | |
5690 | if (!(sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK))) { | |
5691 | io_queue_link_head(head); | |
5692 | *link = NULL; | |
5693 | } | |
9e645e11 | 5694 | } else { |
711be031 PB |
5695 | if (unlikely(ctx->drain_next)) { |
5696 | req->flags |= REQ_F_IO_DRAIN; | |
5697 | req->ctx->drain_next = 0; | |
5698 | } | |
5699 | if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) { | |
5700 | req->flags |= REQ_F_LINK; | |
711be031 | 5701 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f PB |
5702 | |
5703 | if (io_alloc_async_ctx(req)) { | |
5704 | ret = -EAGAIN; | |
5705 | goto err_req; | |
5706 | } | |
711be031 PB |
5707 | ret = io_req_defer_prep(req, sqe); |
5708 | if (ret) | |
5709 | req->flags |= REQ_F_FAIL_LINK; | |
5710 | *link = req; | |
5711 | } else { | |
5712 | io_queue_sqe(req, sqe); | |
5713 | } | |
9e645e11 | 5714 | } |
2e6e1fde PB |
5715 | |
5716 | return true; | |
9e645e11 JA |
5717 | } |
5718 | ||
9a56a232 JA |
5719 | /* |
5720 | * Batched submission is done, ensure local IO is flushed out. | |
5721 | */ | |
5722 | static void io_submit_state_end(struct io_submit_state *state) | |
5723 | { | |
5724 | blk_finish_plug(&state->plug); | |
3d6770fb | 5725 | io_file_put(state); |
2579f913 | 5726 | if (state->free_reqs) |
6c8a3134 | 5727 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
5728 | } |
5729 | ||
5730 | /* | |
5731 | * Start submission side cache. | |
5732 | */ | |
5733 | static void io_submit_state_start(struct io_submit_state *state, | |
22efde59 | 5734 | unsigned int max_ios) |
9a56a232 JA |
5735 | { |
5736 | blk_start_plug(&state->plug); | |
2579f913 | 5737 | state->free_reqs = 0; |
9a56a232 JA |
5738 | state->file = NULL; |
5739 | state->ios_left = max_ios; | |
5740 | } | |
5741 | ||
2b188cc1 JA |
5742 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
5743 | { | |
75b28aff | 5744 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 5745 | |
caf582c6 PB |
5746 | /* |
5747 | * Ensure any loads from the SQEs are done at this point, | |
5748 | * since once we write the new head, the application could | |
5749 | * write new data to them. | |
5750 | */ | |
5751 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
5752 | } |
5753 | ||
2b188cc1 | 5754 | /* |
3529d8c2 | 5755 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
5756 | * that is mapped by userspace. This means that care needs to be taken to |
5757 | * ensure that reads are stable, as we cannot rely on userspace always | |
5758 | * being a good citizen. If members of the sqe are validated and then later | |
5759 | * used, it's important that those reads are done through READ_ONCE() to | |
5760 | * prevent a re-load down the line. | |
5761 | */ | |
3529d8c2 JA |
5762 | static bool io_get_sqring(struct io_ring_ctx *ctx, struct io_kiocb *req, |
5763 | const struct io_uring_sqe **sqe_ptr) | |
2b188cc1 | 5764 | { |
75b28aff | 5765 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
5766 | unsigned head; |
5767 | ||
5768 | /* | |
5769 | * The cached sq head (or cq tail) serves two purposes: | |
5770 | * | |
5771 | * 1) allows us to batch the cost of updating the user visible | |
5772 | * head updates. | |
5773 | * 2) allows the kernel side to track the head on its own, even | |
5774 | * though the application is the one updating it. | |
5775 | */ | |
ee7d46d9 | 5776 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
9835d6fa | 5777 | if (likely(head < ctx->sq_entries)) { |
cf6fd4bd PB |
5778 | /* |
5779 | * All io need record the previous position, if LINK vs DARIN, | |
5780 | * it can be used to mark the position of the first IO in the | |
5781 | * link list. | |
5782 | */ | |
5783 | req->sequence = ctx->cached_sq_head; | |
3529d8c2 JA |
5784 | *sqe_ptr = &ctx->sq_sqes[head]; |
5785 | req->opcode = READ_ONCE((*sqe_ptr)->opcode); | |
5786 | req->user_data = READ_ONCE((*sqe_ptr)->user_data); | |
2b188cc1 JA |
5787 | ctx->cached_sq_head++; |
5788 | return true; | |
5789 | } | |
5790 | ||
5791 | /* drop invalid entries */ | |
5792 | ctx->cached_sq_head++; | |
498ccd9e | 5793 | ctx->cached_sq_dropped++; |
ee7d46d9 | 5794 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
2b188cc1 JA |
5795 | return false; |
5796 | } | |
5797 | ||
fb5ccc98 | 5798 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
ae9428ca PB |
5799 | struct file *ring_file, int ring_fd, |
5800 | struct mm_struct **mm, bool async) | |
6c271ce2 JA |
5801 | { |
5802 | struct io_submit_state state, *statep = NULL; | |
9e645e11 | 5803 | struct io_kiocb *link = NULL; |
9e645e11 | 5804 | int i, submitted = 0; |
95a1b3ff | 5805 | bool mm_fault = false; |
6c271ce2 | 5806 | |
c4a2ed72 | 5807 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
5808 | if (test_bit(0, &ctx->sq_check_overflow)) { |
5809 | if (!list_empty(&ctx->cq_overflow_list) && | |
5810 | !io_cqring_overflow_flush(ctx, false)) | |
5811 | return -EBUSY; | |
5812 | } | |
6c271ce2 | 5813 | |
ee7d46d9 PB |
5814 | /* make sure SQ entry isn't read before tail */ |
5815 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 5816 | |
2b85edfc PB |
5817 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
5818 | return -EAGAIN; | |
6c271ce2 JA |
5819 | |
5820 | if (nr > IO_PLUG_THRESHOLD) { | |
22efde59 | 5821 | io_submit_state_start(&state, nr); |
6c271ce2 JA |
5822 | statep = &state; |
5823 | } | |
5824 | ||
b14cca0c PB |
5825 | ctx->ring_fd = ring_fd; |
5826 | ctx->ring_file = ring_file; | |
5827 | ||
6c271ce2 | 5828 | for (i = 0; i < nr; i++) { |
3529d8c2 | 5829 | const struct io_uring_sqe *sqe; |
196be95c | 5830 | struct io_kiocb *req; |
1cb1edb2 | 5831 | int err; |
fb5ccc98 | 5832 | |
196be95c PB |
5833 | req = io_get_req(ctx, statep); |
5834 | if (unlikely(!req)) { | |
5835 | if (!submitted) | |
5836 | submitted = -EAGAIN; | |
fb5ccc98 | 5837 | break; |
196be95c | 5838 | } |
3529d8c2 | 5839 | if (!io_get_sqring(ctx, req, &sqe)) { |
2b85edfc | 5840 | __io_req_do_free(req); |
196be95c PB |
5841 | break; |
5842 | } | |
fb5ccc98 | 5843 | |
d3656344 JA |
5844 | /* will complete beyond this point, count as submitted */ |
5845 | submitted++; | |
5846 | ||
5847 | if (unlikely(req->opcode >= IORING_OP_LAST)) { | |
1cb1edb2 PB |
5848 | err = -EINVAL; |
5849 | fail_req: | |
5850 | io_cqring_add_event(req, err); | |
d3656344 | 5851 | io_double_put_req(req); |
196be95c PB |
5852 | break; |
5853 | } | |
fb5ccc98 | 5854 | |
d3656344 | 5855 | if (io_op_defs[req->opcode].needs_mm && !*mm) { |
95a1b3ff | 5856 | mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm); |
1cb1edb2 PB |
5857 | if (unlikely(mm_fault)) { |
5858 | err = -EFAULT; | |
5859 | goto fail_req; | |
95a1b3ff | 5860 | } |
1cb1edb2 PB |
5861 | use_mm(ctx->sqo_mm); |
5862 | *mm = ctx->sqo_mm; | |
9e645e11 | 5863 | } |
9e645e11 | 5864 | |
cf6fd4bd | 5865 | req->needs_fixed_file = async; |
354420f7 JA |
5866 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
5867 | true, async); | |
3529d8c2 | 5868 | if (!io_submit_sqe(req, sqe, statep, &link)) |
2e6e1fde | 5869 | break; |
6c271ce2 JA |
5870 | } |
5871 | ||
9466f437 PB |
5872 | if (unlikely(submitted != nr)) { |
5873 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
5874 | ||
5875 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
5876 | } | |
9e645e11 | 5877 | if (link) |
1b4a51b6 | 5878 | io_queue_link_head(link); |
6c271ce2 JA |
5879 | if (statep) |
5880 | io_submit_state_end(&state); | |
5881 | ||
ae9428ca PB |
5882 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
5883 | io_commit_sqring(ctx); | |
5884 | ||
6c271ce2 JA |
5885 | return submitted; |
5886 | } | |
5887 | ||
5888 | static int io_sq_thread(void *data) | |
5889 | { | |
6c271ce2 JA |
5890 | struct io_ring_ctx *ctx = data; |
5891 | struct mm_struct *cur_mm = NULL; | |
181e448d | 5892 | const struct cred *old_cred; |
6c271ce2 JA |
5893 | mm_segment_t old_fs; |
5894 | DEFINE_WAIT(wait); | |
6c271ce2 | 5895 | unsigned long timeout; |
bdcd3eab | 5896 | int ret = 0; |
6c271ce2 | 5897 | |
206aefde | 5898 | complete(&ctx->completions[1]); |
a4c0b3de | 5899 | |
6c271ce2 JA |
5900 | old_fs = get_fs(); |
5901 | set_fs(USER_DS); | |
181e448d | 5902 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 5903 | |
bdcd3eab | 5904 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 5905 | while (!kthread_should_park()) { |
fb5ccc98 | 5906 | unsigned int to_submit; |
6c271ce2 | 5907 | |
bdcd3eab | 5908 | if (!list_empty(&ctx->poll_list)) { |
6c271ce2 JA |
5909 | unsigned nr_events = 0; |
5910 | ||
bdcd3eab XW |
5911 | mutex_lock(&ctx->uring_lock); |
5912 | if (!list_empty(&ctx->poll_list)) | |
5913 | io_iopoll_getevents(ctx, &nr_events, 0); | |
5914 | else | |
6c271ce2 | 5915 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 5916 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
5917 | } |
5918 | ||
fb5ccc98 | 5919 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
5920 | |
5921 | /* | |
5922 | * If submit got -EBUSY, flag us as needing the application | |
5923 | * to enter the kernel to reap and flush events. | |
5924 | */ | |
5925 | if (!to_submit || ret == -EBUSY) { | |
7143b5ac SG |
5926 | /* |
5927 | * Drop cur_mm before scheduling, we can't hold it for | |
5928 | * long periods (or over schedule()). Do this before | |
5929 | * adding ourselves to the waitqueue, as the unuse/drop | |
5930 | * may sleep. | |
5931 | */ | |
5932 | if (cur_mm) { | |
5933 | unuse_mm(cur_mm); | |
5934 | mmput(cur_mm); | |
5935 | cur_mm = NULL; | |
5936 | } | |
5937 | ||
6c271ce2 JA |
5938 | /* |
5939 | * We're polling. If we're within the defined idle | |
5940 | * period, then let us spin without work before going | |
c1edbf5f JA |
5941 | * to sleep. The exception is if we got EBUSY doing |
5942 | * more IO, we should wait for the application to | |
5943 | * reap events and wake us up. | |
6c271ce2 | 5944 | */ |
bdcd3eab | 5945 | if (!list_empty(&ctx->poll_list) || |
df069d80 JA |
5946 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
5947 | !percpu_ref_is_dying(&ctx->refs))) { | |
b41e9852 JA |
5948 | if (current->task_works) |
5949 | task_work_run(); | |
9831a90c | 5950 | cond_resched(); |
6c271ce2 JA |
5951 | continue; |
5952 | } | |
5953 | ||
6c271ce2 JA |
5954 | prepare_to_wait(&ctx->sqo_wait, &wait, |
5955 | TASK_INTERRUPTIBLE); | |
5956 | ||
bdcd3eab XW |
5957 | /* |
5958 | * While doing polled IO, before going to sleep, we need | |
5959 | * to check if there are new reqs added to poll_list, it | |
5960 | * is because reqs may have been punted to io worker and | |
5961 | * will be added to poll_list later, hence check the | |
5962 | * poll_list again. | |
5963 | */ | |
5964 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
5965 | !list_empty_careful(&ctx->poll_list)) { | |
5966 | finish_wait(&ctx->sqo_wait, &wait); | |
5967 | continue; | |
5968 | } | |
5969 | ||
6c271ce2 | 5970 | /* Tell userspace we may need a wakeup call */ |
75b28aff | 5971 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
0d7bae69 SB |
5972 | /* make sure to read SQ tail after writing flags */ |
5973 | smp_mb(); | |
6c271ce2 | 5974 | |
fb5ccc98 | 5975 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 5976 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 5977 | if (kthread_should_park()) { |
6c271ce2 JA |
5978 | finish_wait(&ctx->sqo_wait, &wait); |
5979 | break; | |
5980 | } | |
b41e9852 JA |
5981 | if (current->task_works) { |
5982 | task_work_run(); | |
10bea96d | 5983 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
5984 | continue; |
5985 | } | |
6c271ce2 JA |
5986 | if (signal_pending(current)) |
5987 | flush_signals(current); | |
5988 | schedule(); | |
5989 | finish_wait(&ctx->sqo_wait, &wait); | |
5990 | ||
75b28aff | 5991 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
5992 | continue; |
5993 | } | |
5994 | finish_wait(&ctx->sqo_wait, &wait); | |
5995 | ||
75b28aff | 5996 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
5997 | } |
5998 | ||
8a4955ff | 5999 | mutex_lock(&ctx->uring_lock); |
1d7bb1d5 | 6000 | ret = io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm, true); |
8a4955ff | 6001 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6002 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6003 | } |
6004 | ||
b41e9852 JA |
6005 | if (current->task_works) |
6006 | task_work_run(); | |
6007 | ||
6c271ce2 JA |
6008 | set_fs(old_fs); |
6009 | if (cur_mm) { | |
6010 | unuse_mm(cur_mm); | |
6011 | mmput(cur_mm); | |
6012 | } | |
181e448d | 6013 | revert_creds(old_cred); |
06058632 | 6014 | |
2bbcd6d3 | 6015 | kthread_parkme(); |
06058632 | 6016 | |
6c271ce2 JA |
6017 | return 0; |
6018 | } | |
6019 | ||
bda52162 JA |
6020 | struct io_wait_queue { |
6021 | struct wait_queue_entry wq; | |
6022 | struct io_ring_ctx *ctx; | |
6023 | unsigned to_wait; | |
6024 | unsigned nr_timeouts; | |
6025 | }; | |
6026 | ||
1d7bb1d5 | 6027 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6028 | { |
6029 | struct io_ring_ctx *ctx = iowq->ctx; | |
6030 | ||
6031 | /* | |
d195a66e | 6032 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6033 | * started waiting. For timeouts, we always want to return to userspace, |
6034 | * regardless of event count. | |
6035 | */ | |
1d7bb1d5 | 6036 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6037 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6038 | } | |
6039 | ||
6040 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6041 | int wake_flags, void *key) | |
6042 | { | |
6043 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6044 | wq); | |
6045 | ||
1d7bb1d5 JA |
6046 | /* use noflush == true, as we can't safely rely on locking context */ |
6047 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6048 | return -1; |
6049 | ||
6050 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6051 | } | |
6052 | ||
2b188cc1 JA |
6053 | /* |
6054 | * Wait until events become available, if we don't already have some. The | |
6055 | * application must reap them itself, as they reside on the shared cq ring. | |
6056 | */ | |
6057 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6058 | const sigset_t __user *sig, size_t sigsz) | |
6059 | { | |
bda52162 JA |
6060 | struct io_wait_queue iowq = { |
6061 | .wq = { | |
6062 | .private = current, | |
6063 | .func = io_wake_function, | |
6064 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6065 | }, | |
6066 | .ctx = ctx, | |
6067 | .to_wait = min_events, | |
6068 | }; | |
75b28aff | 6069 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6070 | int ret = 0; |
2b188cc1 | 6071 | |
b41e9852 JA |
6072 | do { |
6073 | if (io_cqring_events(ctx, false) >= min_events) | |
6074 | return 0; | |
6075 | if (!current->task_works) | |
6076 | break; | |
6077 | task_work_run(); | |
6078 | } while (1); | |
2b188cc1 JA |
6079 | |
6080 | if (sig) { | |
9e75ad5d AB |
6081 | #ifdef CONFIG_COMPAT |
6082 | if (in_compat_syscall()) | |
6083 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6084 | sigsz); |
9e75ad5d AB |
6085 | else |
6086 | #endif | |
b772434b | 6087 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6088 | |
2b188cc1 JA |
6089 | if (ret) |
6090 | return ret; | |
6091 | } | |
6092 | ||
bda52162 | 6093 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6094 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6095 | do { |
6096 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6097 | TASK_INTERRUPTIBLE); | |
b41e9852 JA |
6098 | if (current->task_works) |
6099 | task_work_run(); | |
1d7bb1d5 | 6100 | if (io_should_wake(&iowq, false)) |
bda52162 JA |
6101 | break; |
6102 | schedule(); | |
6103 | if (signal_pending(current)) { | |
e9ffa5c2 | 6104 | ret = -EINTR; |
bda52162 JA |
6105 | break; |
6106 | } | |
6107 | } while (1); | |
6108 | finish_wait(&ctx->wait, &iowq.wq); | |
6109 | ||
e9ffa5c2 | 6110 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6111 | |
75b28aff | 6112 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6113 | } |
6114 | ||
6b06314c JA |
6115 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6116 | { | |
6117 | #if defined(CONFIG_UNIX) | |
6118 | if (ctx->ring_sock) { | |
6119 | struct sock *sock = ctx->ring_sock->sk; | |
6120 | struct sk_buff *skb; | |
6121 | ||
6122 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6123 | kfree_skb(skb); | |
6124 | } | |
6125 | #else | |
6126 | int i; | |
6127 | ||
65e19f54 JA |
6128 | for (i = 0; i < ctx->nr_user_files; i++) { |
6129 | struct file *file; | |
6130 | ||
6131 | file = io_file_from_index(ctx, i); | |
6132 | if (file) | |
6133 | fput(file); | |
6134 | } | |
6b06314c JA |
6135 | #endif |
6136 | } | |
6137 | ||
05f3fb3c JA |
6138 | static void io_file_ref_kill(struct percpu_ref *ref) |
6139 | { | |
6140 | struct fixed_file_data *data; | |
6141 | ||
6142 | data = container_of(ref, struct fixed_file_data, refs); | |
6143 | complete(&data->done); | |
6144 | } | |
6145 | ||
6b06314c JA |
6146 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6147 | { | |
05f3fb3c | 6148 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6149 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 | 6150 | unsigned nr_tables, i; |
05589553 | 6151 | unsigned long flags; |
65e19f54 | 6152 | |
05f3fb3c | 6153 | if (!data) |
6b06314c JA |
6154 | return -ENXIO; |
6155 | ||
05589553 XW |
6156 | spin_lock_irqsave(&data->lock, flags); |
6157 | if (!list_empty(&data->ref_list)) | |
6158 | ref_node = list_first_entry(&data->ref_list, | |
6159 | struct fixed_file_ref_node, node); | |
6160 | spin_unlock_irqrestore(&data->lock, flags); | |
6161 | if (ref_node) | |
6162 | percpu_ref_kill(&ref_node->refs); | |
6163 | ||
6164 | percpu_ref_kill(&data->refs); | |
6165 | ||
6166 | /* wait for all refs nodes to complete */ | |
2faf852d | 6167 | wait_for_completion(&data->done); |
05f3fb3c | 6168 | |
6b06314c | 6169 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6170 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6171 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6172 | kfree(data->table[i].files); |
6173 | kfree(data->table); | |
05589553 XW |
6174 | percpu_ref_exit(&data->refs); |
6175 | kfree(data); | |
05f3fb3c | 6176 | ctx->file_data = NULL; |
6b06314c JA |
6177 | ctx->nr_user_files = 0; |
6178 | return 0; | |
6179 | } | |
6180 | ||
6c271ce2 JA |
6181 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6182 | { | |
6183 | if (ctx->sqo_thread) { | |
206aefde | 6184 | wait_for_completion(&ctx->completions[1]); |
2bbcd6d3 RP |
6185 | /* |
6186 | * The park is a bit of a work-around, without it we get | |
6187 | * warning spews on shutdown with SQPOLL set and affinity | |
6188 | * set to a single CPU. | |
6189 | */ | |
06058632 | 6190 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6191 | kthread_stop(ctx->sqo_thread); |
6192 | ctx->sqo_thread = NULL; | |
6193 | } | |
6194 | } | |
6195 | ||
6b06314c JA |
6196 | static void io_finish_async(struct io_ring_ctx *ctx) |
6197 | { | |
6c271ce2 JA |
6198 | io_sq_thread_stop(ctx); |
6199 | ||
561fb04a JA |
6200 | if (ctx->io_wq) { |
6201 | io_wq_destroy(ctx->io_wq); | |
6202 | ctx->io_wq = NULL; | |
6b06314c JA |
6203 | } |
6204 | } | |
6205 | ||
6206 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6207 | /* |
6208 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6209 | * the io_uring can be safely unregistered on process exit, even if we have | |
6210 | * loops in the file referencing. | |
6211 | */ | |
6212 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6213 | { | |
6214 | struct sock *sk = ctx->ring_sock->sk; | |
6215 | struct scm_fp_list *fpl; | |
6216 | struct sk_buff *skb; | |
08a45173 | 6217 | int i, nr_files; |
6b06314c JA |
6218 | |
6219 | if (!capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) { | |
6220 | unsigned long inflight = ctx->user->unix_inflight + nr; | |
6221 | ||
6222 | if (inflight > task_rlimit(current, RLIMIT_NOFILE)) | |
6223 | return -EMFILE; | |
6224 | } | |
6225 | ||
6226 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); | |
6227 | if (!fpl) | |
6228 | return -ENOMEM; | |
6229 | ||
6230 | skb = alloc_skb(0, GFP_KERNEL); | |
6231 | if (!skb) { | |
6232 | kfree(fpl); | |
6233 | return -ENOMEM; | |
6234 | } | |
6235 | ||
6236 | skb->sk = sk; | |
6b06314c | 6237 | |
08a45173 | 6238 | nr_files = 0; |
6b06314c JA |
6239 | fpl->user = get_uid(ctx->user); |
6240 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6241 | struct file *file = io_file_from_index(ctx, i + offset); |
6242 | ||
6243 | if (!file) | |
08a45173 | 6244 | continue; |
65e19f54 | 6245 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6246 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6247 | nr_files++; | |
6b06314c JA |
6248 | } |
6249 | ||
08a45173 JA |
6250 | if (nr_files) { |
6251 | fpl->max = SCM_MAX_FD; | |
6252 | fpl->count = nr_files; | |
6253 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6254 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6255 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6256 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6257 | |
08a45173 JA |
6258 | for (i = 0; i < nr_files; i++) |
6259 | fput(fpl->fp[i]); | |
6260 | } else { | |
6261 | kfree_skb(skb); | |
6262 | kfree(fpl); | |
6263 | } | |
6b06314c JA |
6264 | |
6265 | return 0; | |
6266 | } | |
6267 | ||
6268 | /* | |
6269 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6270 | * causes regular reference counting to break down. We rely on the UNIX | |
6271 | * garbage collection to take care of this problem for us. | |
6272 | */ | |
6273 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6274 | { | |
6275 | unsigned left, total; | |
6276 | int ret = 0; | |
6277 | ||
6278 | total = 0; | |
6279 | left = ctx->nr_user_files; | |
6280 | while (left) { | |
6281 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6282 | |
6283 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6284 | if (ret) | |
6285 | break; | |
6286 | left -= this_files; | |
6287 | total += this_files; | |
6288 | } | |
6289 | ||
6290 | if (!ret) | |
6291 | return 0; | |
6292 | ||
6293 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6294 | struct file *file = io_file_from_index(ctx, total); |
6295 | ||
6296 | if (file) | |
6297 | fput(file); | |
6b06314c JA |
6298 | total++; |
6299 | } | |
6300 | ||
6301 | return ret; | |
6302 | } | |
6303 | #else | |
6304 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6305 | { | |
6306 | return 0; | |
6307 | } | |
6308 | #endif | |
6309 | ||
65e19f54 JA |
6310 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6311 | unsigned nr_files) | |
6312 | { | |
6313 | int i; | |
6314 | ||
6315 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6316 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6317 | unsigned this_files; |
6318 | ||
6319 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6320 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6321 | GFP_KERNEL); | |
6322 | if (!table->files) | |
6323 | break; | |
6324 | nr_files -= this_files; | |
6325 | } | |
6326 | ||
6327 | if (i == nr_tables) | |
6328 | return 0; | |
6329 | ||
6330 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6331 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6332 | kfree(table->files); |
6333 | } | |
6334 | return 1; | |
6335 | } | |
6336 | ||
05f3fb3c JA |
6337 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6338 | { | |
6339 | #if defined(CONFIG_UNIX) | |
6340 | struct sock *sock = ctx->ring_sock->sk; | |
6341 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6342 | struct sk_buff *skb; | |
6343 | int i; | |
6344 | ||
6345 | __skb_queue_head_init(&list); | |
6346 | ||
6347 | /* | |
6348 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6349 | * remove this entry and rearrange the file array. | |
6350 | */ | |
6351 | skb = skb_dequeue(head); | |
6352 | while (skb) { | |
6353 | struct scm_fp_list *fp; | |
6354 | ||
6355 | fp = UNIXCB(skb).fp; | |
6356 | for (i = 0; i < fp->count; i++) { | |
6357 | int left; | |
6358 | ||
6359 | if (fp->fp[i] != file) | |
6360 | continue; | |
6361 | ||
6362 | unix_notinflight(fp->user, fp->fp[i]); | |
6363 | left = fp->count - 1 - i; | |
6364 | if (left) { | |
6365 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6366 | left * sizeof(struct file *)); | |
6367 | } | |
6368 | fp->count--; | |
6369 | if (!fp->count) { | |
6370 | kfree_skb(skb); | |
6371 | skb = NULL; | |
6372 | } else { | |
6373 | __skb_queue_tail(&list, skb); | |
6374 | } | |
6375 | fput(file); | |
6376 | file = NULL; | |
6377 | break; | |
6378 | } | |
6379 | ||
6380 | if (!file) | |
6381 | break; | |
6382 | ||
6383 | __skb_queue_tail(&list, skb); | |
6384 | ||
6385 | skb = skb_dequeue(head); | |
6386 | } | |
6387 | ||
6388 | if (skb_peek(&list)) { | |
6389 | spin_lock_irq(&head->lock); | |
6390 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6391 | __skb_queue_tail(head, skb); | |
6392 | spin_unlock_irq(&head->lock); | |
6393 | } | |
6394 | #else | |
6395 | fput(file); | |
6396 | #endif | |
6397 | } | |
6398 | ||
6399 | struct io_file_put { | |
05589553 | 6400 | struct list_head list; |
05f3fb3c | 6401 | struct file *file; |
05f3fb3c JA |
6402 | }; |
6403 | ||
05589553 | 6404 | static void io_file_put_work(struct work_struct *work) |
65e19f54 | 6405 | { |
05589553 XW |
6406 | struct fixed_file_ref_node *ref_node; |
6407 | struct fixed_file_data *file_data; | |
6408 | struct io_ring_ctx *ctx; | |
05f3fb3c | 6409 | struct io_file_put *pfile, *tmp; |
05589553 | 6410 | unsigned long flags; |
65e19f54 | 6411 | |
05589553 XW |
6412 | ref_node = container_of(work, struct fixed_file_ref_node, work); |
6413 | file_data = ref_node->file_data; | |
6414 | ctx = file_data->ctx; | |
6415 | ||
6416 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6417 | list_del_init(&pfile->list); | |
6418 | io_ring_file_put(ctx, pfile->file); | |
6419 | kfree(pfile); | |
65e19f54 | 6420 | } |
05589553 XW |
6421 | |
6422 | spin_lock_irqsave(&file_data->lock, flags); | |
6423 | list_del_init(&ref_node->node); | |
6424 | spin_unlock_irqrestore(&file_data->lock, flags); | |
6425 | ||
6426 | percpu_ref_exit(&ref_node->refs); | |
6427 | kfree(ref_node); | |
6428 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6429 | } |
65e19f54 | 6430 | |
05589553 | 6431 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6432 | { |
05589553 | 6433 | struct fixed_file_ref_node *ref_node; |
65e19f54 | 6434 | |
05589553 XW |
6435 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
6436 | ||
6437 | queue_work(system_wq, &ref_node->work); | |
05f3fb3c | 6438 | } |
65e19f54 | 6439 | |
05589553 XW |
6440 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6441 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6442 | { |
05589553 | 6443 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6444 | |
05589553 XW |
6445 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6446 | if (!ref_node) | |
6447 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6448 | |
05589553 XW |
6449 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6450 | 0, GFP_KERNEL)) { | |
6451 | kfree(ref_node); | |
6452 | return ERR_PTR(-ENOMEM); | |
6453 | } | |
6454 | INIT_LIST_HEAD(&ref_node->node); | |
6455 | INIT_LIST_HEAD(&ref_node->file_list); | |
6456 | INIT_WORK(&ref_node->work, io_file_put_work); | |
6457 | ref_node->file_data = ctx->file_data; | |
6458 | return ref_node; | |
6459 | ||
6460 | } | |
6461 | ||
6462 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6463 | { | |
6464 | percpu_ref_exit(&ref_node->refs); | |
6465 | kfree(ref_node); | |
65e19f54 JA |
6466 | } |
6467 | ||
6b06314c JA |
6468 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6469 | unsigned nr_args) | |
6470 | { | |
6471 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6472 | unsigned nr_tables; |
05f3fb3c | 6473 | struct file *file; |
6b06314c JA |
6474 | int fd, ret = 0; |
6475 | unsigned i; | |
05589553 XW |
6476 | struct fixed_file_ref_node *ref_node; |
6477 | unsigned long flags; | |
6b06314c | 6478 | |
05f3fb3c | 6479 | if (ctx->file_data) |
6b06314c JA |
6480 | return -EBUSY; |
6481 | if (!nr_args) | |
6482 | return -EINVAL; | |
6483 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6484 | return -EMFILE; | |
6485 | ||
05f3fb3c JA |
6486 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6487 | if (!ctx->file_data) | |
6488 | return -ENOMEM; | |
6489 | ctx->file_data->ctx = ctx; | |
6490 | init_completion(&ctx->file_data->done); | |
05589553 | 6491 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
05f3fb3c | 6492 | |
65e19f54 | 6493 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6494 | ctx->file_data->table = kcalloc(nr_tables, |
6495 | sizeof(struct fixed_file_table), | |
65e19f54 | 6496 | GFP_KERNEL); |
05f3fb3c JA |
6497 | if (!ctx->file_data->table) { |
6498 | kfree(ctx->file_data); | |
6499 | ctx->file_data = NULL; | |
6b06314c | 6500 | return -ENOMEM; |
05f3fb3c JA |
6501 | } |
6502 | ||
05589553 | 6503 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6504 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6505 | kfree(ctx->file_data->table); | |
6506 | kfree(ctx->file_data); | |
6507 | ctx->file_data = NULL; | |
6b06314c | 6508 | return -ENOMEM; |
05f3fb3c | 6509 | } |
6b06314c | 6510 | |
65e19f54 | 6511 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6512 | percpu_ref_exit(&ctx->file_data->refs); |
6513 | kfree(ctx->file_data->table); | |
6514 | kfree(ctx->file_data); | |
6515 | ctx->file_data = NULL; | |
65e19f54 JA |
6516 | return -ENOMEM; |
6517 | } | |
6518 | ||
08a45173 | 6519 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6520 | struct fixed_file_table *table; |
6521 | unsigned index; | |
6522 | ||
6b06314c JA |
6523 | ret = -EFAULT; |
6524 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6525 | break; | |
08a45173 JA |
6526 | /* allow sparse sets */ |
6527 | if (fd == -1) { | |
6528 | ret = 0; | |
6529 | continue; | |
6530 | } | |
6b06314c | 6531 | |
05f3fb3c | 6532 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6533 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6534 | file = fget(fd); |
6b06314c JA |
6535 | |
6536 | ret = -EBADF; | |
05f3fb3c | 6537 | if (!file) |
6b06314c | 6538 | break; |
05f3fb3c | 6539 | |
6b06314c JA |
6540 | /* |
6541 | * Don't allow io_uring instances to be registered. If UNIX | |
6542 | * isn't enabled, then this causes a reference cycle and this | |
6543 | * instance can never get freed. If UNIX is enabled we'll | |
6544 | * handle it just fine, but there's still no point in allowing | |
6545 | * a ring fd as it doesn't support regular read/write anyway. | |
6546 | */ | |
05f3fb3c JA |
6547 | if (file->f_op == &io_uring_fops) { |
6548 | fput(file); | |
6b06314c JA |
6549 | break; |
6550 | } | |
6b06314c | 6551 | ret = 0; |
05f3fb3c | 6552 | table->files[index] = file; |
6b06314c JA |
6553 | } |
6554 | ||
6555 | if (ret) { | |
65e19f54 | 6556 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
6557 | file = io_file_from_index(ctx, i); |
6558 | if (file) | |
6559 | fput(file); | |
6560 | } | |
6561 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 6562 | kfree(ctx->file_data->table[i].files); |
6b06314c | 6563 | |
05f3fb3c JA |
6564 | kfree(ctx->file_data->table); |
6565 | kfree(ctx->file_data); | |
6566 | ctx->file_data = NULL; | |
6b06314c JA |
6567 | ctx->nr_user_files = 0; |
6568 | return ret; | |
6569 | } | |
6570 | ||
6571 | ret = io_sqe_files_scm(ctx); | |
05589553 | 6572 | if (ret) { |
6b06314c | 6573 | io_sqe_files_unregister(ctx); |
05589553 XW |
6574 | return ret; |
6575 | } | |
6b06314c | 6576 | |
05589553 XW |
6577 | ref_node = alloc_fixed_file_ref_node(ctx); |
6578 | if (IS_ERR(ref_node)) { | |
6579 | io_sqe_files_unregister(ctx); | |
6580 | return PTR_ERR(ref_node); | |
6581 | } | |
6582 | ||
6583 | ctx->file_data->cur_refs = &ref_node->refs; | |
6584 | spin_lock_irqsave(&ctx->file_data->lock, flags); | |
6585 | list_add(&ref_node->node, &ctx->file_data->ref_list); | |
6586 | spin_unlock_irqrestore(&ctx->file_data->lock, flags); | |
6587 | percpu_ref_get(&ctx->file_data->refs); | |
6b06314c JA |
6588 | return ret; |
6589 | } | |
6590 | ||
c3a31e60 JA |
6591 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
6592 | int index) | |
6593 | { | |
6594 | #if defined(CONFIG_UNIX) | |
6595 | struct sock *sock = ctx->ring_sock->sk; | |
6596 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
6597 | struct sk_buff *skb; | |
6598 | ||
6599 | /* | |
6600 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
6601 | * file set. If there's no room, fall back to allocating a new skb | |
6602 | * and filling it in. | |
6603 | */ | |
6604 | spin_lock_irq(&head->lock); | |
6605 | skb = skb_peek(head); | |
6606 | if (skb) { | |
6607 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
6608 | ||
6609 | if (fpl->count < SCM_MAX_FD) { | |
6610 | __skb_unlink(skb, head); | |
6611 | spin_unlock_irq(&head->lock); | |
6612 | fpl->fp[fpl->count] = get_file(file); | |
6613 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
6614 | fpl->count++; | |
6615 | spin_lock_irq(&head->lock); | |
6616 | __skb_queue_head(head, skb); | |
6617 | } else { | |
6618 | skb = NULL; | |
6619 | } | |
6620 | } | |
6621 | spin_unlock_irq(&head->lock); | |
6622 | ||
6623 | if (skb) { | |
6624 | fput(file); | |
6625 | return 0; | |
6626 | } | |
6627 | ||
6628 | return __io_sqe_files_scm(ctx, 1, index); | |
6629 | #else | |
6630 | return 0; | |
6631 | #endif | |
6632 | } | |
6633 | ||
a5318d3c | 6634 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 6635 | struct file *file) |
05f3fb3c | 6636 | { |
a5318d3c | 6637 | struct io_file_put *pfile; |
05589553 XW |
6638 | struct percpu_ref *refs = data->cur_refs; |
6639 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 6640 | |
05f3fb3c | 6641 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
6642 | if (!pfile) |
6643 | return -ENOMEM; | |
05f3fb3c | 6644 | |
05589553 | 6645 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 6646 | pfile->file = file; |
05589553 XW |
6647 | list_add(&pfile->list, &ref_node->file_list); |
6648 | ||
a5318d3c | 6649 | return 0; |
05f3fb3c JA |
6650 | } |
6651 | ||
6652 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
6653 | struct io_uring_files_update *up, | |
6654 | unsigned nr_args) | |
6655 | { | |
6656 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 6657 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6658 | struct file *file; |
c3a31e60 JA |
6659 | __s32 __user *fds; |
6660 | int fd, i, err; | |
6661 | __u32 done; | |
05589553 XW |
6662 | unsigned long flags; |
6663 | bool needs_switch = false; | |
c3a31e60 | 6664 | |
05f3fb3c | 6665 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
6666 | return -EOVERFLOW; |
6667 | if (done > ctx->nr_user_files) | |
6668 | return -EINVAL; | |
6669 | ||
05589553 XW |
6670 | ref_node = alloc_fixed_file_ref_node(ctx); |
6671 | if (IS_ERR(ref_node)) | |
6672 | return PTR_ERR(ref_node); | |
6673 | ||
c3a31e60 | 6674 | done = 0; |
05f3fb3c | 6675 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 6676 | while (nr_args) { |
65e19f54 JA |
6677 | struct fixed_file_table *table; |
6678 | unsigned index; | |
6679 | ||
c3a31e60 JA |
6680 | err = 0; |
6681 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
6682 | err = -EFAULT; | |
6683 | break; | |
6684 | } | |
05f3fb3c JA |
6685 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
6686 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
6687 | index = i & IORING_FILE_TABLE_MASK; |
6688 | if (table->files[index]) { | |
05f3fb3c | 6689 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
6690 | err = io_queue_file_removal(data, file); |
6691 | if (err) | |
6692 | break; | |
65e19f54 | 6693 | table->files[index] = NULL; |
05589553 | 6694 | needs_switch = true; |
c3a31e60 JA |
6695 | } |
6696 | if (fd != -1) { | |
c3a31e60 JA |
6697 | file = fget(fd); |
6698 | if (!file) { | |
6699 | err = -EBADF; | |
6700 | break; | |
6701 | } | |
6702 | /* | |
6703 | * Don't allow io_uring instances to be registered. If | |
6704 | * UNIX isn't enabled, then this causes a reference | |
6705 | * cycle and this instance can never get freed. If UNIX | |
6706 | * is enabled we'll handle it just fine, but there's | |
6707 | * still no point in allowing a ring fd as it doesn't | |
6708 | * support regular read/write anyway. | |
6709 | */ | |
6710 | if (file->f_op == &io_uring_fops) { | |
6711 | fput(file); | |
6712 | err = -EBADF; | |
6713 | break; | |
6714 | } | |
65e19f54 | 6715 | table->files[index] = file; |
c3a31e60 JA |
6716 | err = io_sqe_file_register(ctx, file, i); |
6717 | if (err) | |
6718 | break; | |
6719 | } | |
6720 | nr_args--; | |
6721 | done++; | |
05f3fb3c JA |
6722 | up->offset++; |
6723 | } | |
6724 | ||
05589553 XW |
6725 | if (needs_switch) { |
6726 | percpu_ref_kill(data->cur_refs); | |
6727 | spin_lock_irqsave(&data->lock, flags); | |
6728 | list_add(&ref_node->node, &data->ref_list); | |
6729 | data->cur_refs = &ref_node->refs; | |
6730 | spin_unlock_irqrestore(&data->lock, flags); | |
6731 | percpu_ref_get(&ctx->file_data->refs); | |
6732 | } else | |
6733 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
6734 | |
6735 | return done ? done : err; | |
6736 | } | |
05589553 | 6737 | |
05f3fb3c JA |
6738 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
6739 | unsigned nr_args) | |
6740 | { | |
6741 | struct io_uring_files_update up; | |
6742 | ||
6743 | if (!ctx->file_data) | |
6744 | return -ENXIO; | |
6745 | if (!nr_args) | |
6746 | return -EINVAL; | |
6747 | if (copy_from_user(&up, arg, sizeof(up))) | |
6748 | return -EFAULT; | |
6749 | if (up.resv) | |
6750 | return -EINVAL; | |
6751 | ||
6752 | return __io_sqe_files_update(ctx, &up, nr_args); | |
6753 | } | |
c3a31e60 | 6754 | |
e9fd9396 | 6755 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
6756 | { |
6757 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6758 | ||
e9fd9396 | 6759 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
6760 | io_put_req(req); |
6761 | } | |
6762 | ||
24369c2e PB |
6763 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
6764 | struct io_uring_params *p) | |
6765 | { | |
6766 | struct io_wq_data data; | |
6767 | struct fd f; | |
6768 | struct io_ring_ctx *ctx_attach; | |
6769 | unsigned int concurrency; | |
6770 | int ret = 0; | |
6771 | ||
6772 | data.user = ctx->user; | |
e9fd9396 | 6773 | data.free_work = io_free_work; |
24369c2e PB |
6774 | |
6775 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
6776 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
6777 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
6778 | ||
6779 | ctx->io_wq = io_wq_create(concurrency, &data); | |
6780 | if (IS_ERR(ctx->io_wq)) { | |
6781 | ret = PTR_ERR(ctx->io_wq); | |
6782 | ctx->io_wq = NULL; | |
6783 | } | |
6784 | return ret; | |
6785 | } | |
6786 | ||
6787 | f = fdget(p->wq_fd); | |
6788 | if (!f.file) | |
6789 | return -EBADF; | |
6790 | ||
6791 | if (f.file->f_op != &io_uring_fops) { | |
6792 | ret = -EINVAL; | |
6793 | goto out_fput; | |
6794 | } | |
6795 | ||
6796 | ctx_attach = f.file->private_data; | |
6797 | /* @io_wq is protected by holding the fd */ | |
6798 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
6799 | ret = -EINVAL; | |
6800 | goto out_fput; | |
6801 | } | |
6802 | ||
6803 | ctx->io_wq = ctx_attach->io_wq; | |
6804 | out_fput: | |
6805 | fdput(f); | |
6806 | return ret; | |
6807 | } | |
6808 | ||
6c271ce2 JA |
6809 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
6810 | struct io_uring_params *p) | |
2b188cc1 JA |
6811 | { |
6812 | int ret; | |
6813 | ||
6c271ce2 | 6814 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 JA |
6815 | mmgrab(current->mm); |
6816 | ctx->sqo_mm = current->mm; | |
6817 | ||
6c271ce2 | 6818 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
6819 | ret = -EPERM; |
6820 | if (!capable(CAP_SYS_ADMIN)) | |
6821 | goto err; | |
6822 | ||
917257da JA |
6823 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
6824 | if (!ctx->sq_thread_idle) | |
6825 | ctx->sq_thread_idle = HZ; | |
6826 | ||
6c271ce2 | 6827 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 6828 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 6829 | |
917257da | 6830 | ret = -EINVAL; |
44a9bd18 JA |
6831 | if (cpu >= nr_cpu_ids) |
6832 | goto err; | |
7889f44d | 6833 | if (!cpu_online(cpu)) |
917257da JA |
6834 | goto err; |
6835 | ||
6c271ce2 JA |
6836 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
6837 | ctx, cpu, | |
6838 | "io_uring-sq"); | |
6839 | } else { | |
6840 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
6841 | "io_uring-sq"); | |
6842 | } | |
6843 | if (IS_ERR(ctx->sqo_thread)) { | |
6844 | ret = PTR_ERR(ctx->sqo_thread); | |
6845 | ctx->sqo_thread = NULL; | |
6846 | goto err; | |
6847 | } | |
6848 | wake_up_process(ctx->sqo_thread); | |
6849 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
6850 | /* Can't have SQ_AFF without SQPOLL */ | |
6851 | ret = -EINVAL; | |
6852 | goto err; | |
6853 | } | |
6854 | ||
24369c2e PB |
6855 | ret = io_init_wq_offload(ctx, p); |
6856 | if (ret) | |
2b188cc1 | 6857 | goto err; |
2b188cc1 JA |
6858 | |
6859 | return 0; | |
6860 | err: | |
54a91f3b | 6861 | io_finish_async(ctx); |
2b188cc1 JA |
6862 | mmdrop(ctx->sqo_mm); |
6863 | ctx->sqo_mm = NULL; | |
6864 | return ret; | |
6865 | } | |
6866 | ||
6867 | static void io_unaccount_mem(struct user_struct *user, unsigned long nr_pages) | |
6868 | { | |
6869 | atomic_long_sub(nr_pages, &user->locked_vm); | |
6870 | } | |
6871 | ||
6872 | static int io_account_mem(struct user_struct *user, unsigned long nr_pages) | |
6873 | { | |
6874 | unsigned long page_limit, cur_pages, new_pages; | |
6875 | ||
6876 | /* Don't allow more pages than we can safely lock */ | |
6877 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
6878 | ||
6879 | do { | |
6880 | cur_pages = atomic_long_read(&user->locked_vm); | |
6881 | new_pages = cur_pages + nr_pages; | |
6882 | if (new_pages > page_limit) | |
6883 | return -ENOMEM; | |
6884 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
6885 | new_pages) != cur_pages); | |
6886 | ||
6887 | return 0; | |
6888 | } | |
6889 | ||
6890 | static void io_mem_free(void *ptr) | |
6891 | { | |
52e04ef4 MR |
6892 | struct page *page; |
6893 | ||
6894 | if (!ptr) | |
6895 | return; | |
2b188cc1 | 6896 | |
52e04ef4 | 6897 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
6898 | if (put_page_testzero(page)) |
6899 | free_compound_page(page); | |
6900 | } | |
6901 | ||
6902 | static void *io_mem_alloc(size_t size) | |
6903 | { | |
6904 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
6905 | __GFP_NORETRY; | |
6906 | ||
6907 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
6908 | } | |
6909 | ||
75b28aff HV |
6910 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
6911 | size_t *sq_offset) | |
6912 | { | |
6913 | struct io_rings *rings; | |
6914 | size_t off, sq_array_size; | |
6915 | ||
6916 | off = struct_size(rings, cqes, cq_entries); | |
6917 | if (off == SIZE_MAX) | |
6918 | return SIZE_MAX; | |
6919 | ||
6920 | #ifdef CONFIG_SMP | |
6921 | off = ALIGN(off, SMP_CACHE_BYTES); | |
6922 | if (off == 0) | |
6923 | return SIZE_MAX; | |
6924 | #endif | |
6925 | ||
6926 | sq_array_size = array_size(sizeof(u32), sq_entries); | |
6927 | if (sq_array_size == SIZE_MAX) | |
6928 | return SIZE_MAX; | |
6929 | ||
6930 | if (check_add_overflow(off, sq_array_size, &off)) | |
6931 | return SIZE_MAX; | |
6932 | ||
6933 | if (sq_offset) | |
6934 | *sq_offset = off; | |
6935 | ||
6936 | return off; | |
6937 | } | |
6938 | ||
2b188cc1 JA |
6939 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
6940 | { | |
75b28aff | 6941 | size_t pages; |
2b188cc1 | 6942 | |
75b28aff HV |
6943 | pages = (size_t)1 << get_order( |
6944 | rings_size(sq_entries, cq_entries, NULL)); | |
6945 | pages += (size_t)1 << get_order( | |
6946 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 6947 | |
75b28aff | 6948 | return pages; |
2b188cc1 JA |
6949 | } |
6950 | ||
edafccee JA |
6951 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
6952 | { | |
6953 | int i, j; | |
6954 | ||
6955 | if (!ctx->user_bufs) | |
6956 | return -ENXIO; | |
6957 | ||
6958 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
6959 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
6960 | ||
6961 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 6962 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee JA |
6963 | |
6964 | if (ctx->account_mem) | |
6965 | io_unaccount_mem(ctx->user, imu->nr_bvecs); | |
d4ef6475 | 6966 | kvfree(imu->bvec); |
edafccee JA |
6967 | imu->nr_bvecs = 0; |
6968 | } | |
6969 | ||
6970 | kfree(ctx->user_bufs); | |
6971 | ctx->user_bufs = NULL; | |
6972 | ctx->nr_user_bufs = 0; | |
6973 | return 0; | |
6974 | } | |
6975 | ||
6976 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
6977 | void __user *arg, unsigned index) | |
6978 | { | |
6979 | struct iovec __user *src; | |
6980 | ||
6981 | #ifdef CONFIG_COMPAT | |
6982 | if (ctx->compat) { | |
6983 | struct compat_iovec __user *ciovs; | |
6984 | struct compat_iovec ciov; | |
6985 | ||
6986 | ciovs = (struct compat_iovec __user *) arg; | |
6987 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
6988 | return -EFAULT; | |
6989 | ||
d55e5f5b | 6990 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
6991 | dst->iov_len = ciov.iov_len; |
6992 | return 0; | |
6993 | } | |
6994 | #endif | |
6995 | src = (struct iovec __user *) arg; | |
6996 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
6997 | return -EFAULT; | |
6998 | return 0; | |
6999 | } | |
7000 | ||
7001 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7002 | unsigned nr_args) | |
7003 | { | |
7004 | struct vm_area_struct **vmas = NULL; | |
7005 | struct page **pages = NULL; | |
7006 | int i, j, got_pages = 0; | |
7007 | int ret = -EINVAL; | |
7008 | ||
7009 | if (ctx->user_bufs) | |
7010 | return -EBUSY; | |
7011 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7012 | return -EINVAL; | |
7013 | ||
7014 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7015 | GFP_KERNEL); | |
7016 | if (!ctx->user_bufs) | |
7017 | return -ENOMEM; | |
7018 | ||
7019 | for (i = 0; i < nr_args; i++) { | |
7020 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7021 | unsigned long off, start, end, ubuf; | |
7022 | int pret, nr_pages; | |
7023 | struct iovec iov; | |
7024 | size_t size; | |
7025 | ||
7026 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7027 | if (ret) | |
a278682d | 7028 | goto err; |
edafccee JA |
7029 | |
7030 | /* | |
7031 | * Don't impose further limits on the size and buffer | |
7032 | * constraints here, we'll -EINVAL later when IO is | |
7033 | * submitted if they are wrong. | |
7034 | */ | |
7035 | ret = -EFAULT; | |
7036 | if (!iov.iov_base || !iov.iov_len) | |
7037 | goto err; | |
7038 | ||
7039 | /* arbitrary limit, but we need something */ | |
7040 | if (iov.iov_len > SZ_1G) | |
7041 | goto err; | |
7042 | ||
7043 | ubuf = (unsigned long) iov.iov_base; | |
7044 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7045 | start = ubuf >> PAGE_SHIFT; | |
7046 | nr_pages = end - start; | |
7047 | ||
7048 | if (ctx->account_mem) { | |
7049 | ret = io_account_mem(ctx->user, nr_pages); | |
7050 | if (ret) | |
7051 | goto err; | |
7052 | } | |
7053 | ||
7054 | ret = 0; | |
7055 | if (!pages || nr_pages > got_pages) { | |
7056 | kfree(vmas); | |
7057 | kfree(pages); | |
d4ef6475 | 7058 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7059 | GFP_KERNEL); |
d4ef6475 | 7060 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7061 | sizeof(struct vm_area_struct *), |
7062 | GFP_KERNEL); | |
7063 | if (!pages || !vmas) { | |
7064 | ret = -ENOMEM; | |
7065 | if (ctx->account_mem) | |
7066 | io_unaccount_mem(ctx->user, nr_pages); | |
7067 | goto err; | |
7068 | } | |
7069 | got_pages = nr_pages; | |
7070 | } | |
7071 | ||
d4ef6475 | 7072 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7073 | GFP_KERNEL); |
7074 | ret = -ENOMEM; | |
7075 | if (!imu->bvec) { | |
7076 | if (ctx->account_mem) | |
7077 | io_unaccount_mem(ctx->user, nr_pages); | |
7078 | goto err; | |
7079 | } | |
7080 | ||
7081 | ret = 0; | |
7082 | down_read(¤t->mm->mmap_sem); | |
2113b05d | 7083 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7084 | FOLL_WRITE | FOLL_LONGTERM, |
7085 | pages, vmas); | |
edafccee JA |
7086 | if (pret == nr_pages) { |
7087 | /* don't support file backed memory */ | |
7088 | for (j = 0; j < nr_pages; j++) { | |
7089 | struct vm_area_struct *vma = vmas[j]; | |
7090 | ||
7091 | if (vma->vm_file && | |
7092 | !is_file_hugepages(vma->vm_file)) { | |
7093 | ret = -EOPNOTSUPP; | |
7094 | break; | |
7095 | } | |
7096 | } | |
7097 | } else { | |
7098 | ret = pret < 0 ? pret : -EFAULT; | |
7099 | } | |
7100 | up_read(¤t->mm->mmap_sem); | |
7101 | if (ret) { | |
7102 | /* | |
7103 | * if we did partial map, or found file backed vmas, | |
7104 | * release any pages we did get | |
7105 | */ | |
27c4d3a3 | 7106 | if (pret > 0) |
f1f6a7dd | 7107 | unpin_user_pages(pages, pret); |
edafccee JA |
7108 | if (ctx->account_mem) |
7109 | io_unaccount_mem(ctx->user, nr_pages); | |
d4ef6475 | 7110 | kvfree(imu->bvec); |
edafccee JA |
7111 | goto err; |
7112 | } | |
7113 | ||
7114 | off = ubuf & ~PAGE_MASK; | |
7115 | size = iov.iov_len; | |
7116 | for (j = 0; j < nr_pages; j++) { | |
7117 | size_t vec_len; | |
7118 | ||
7119 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7120 | imu->bvec[j].bv_page = pages[j]; | |
7121 | imu->bvec[j].bv_len = vec_len; | |
7122 | imu->bvec[j].bv_offset = off; | |
7123 | off = 0; | |
7124 | size -= vec_len; | |
7125 | } | |
7126 | /* store original address for later verification */ | |
7127 | imu->ubuf = ubuf; | |
7128 | imu->len = iov.iov_len; | |
7129 | imu->nr_bvecs = nr_pages; | |
7130 | ||
7131 | ctx->nr_user_bufs++; | |
7132 | } | |
d4ef6475 MR |
7133 | kvfree(pages); |
7134 | kvfree(vmas); | |
edafccee JA |
7135 | return 0; |
7136 | err: | |
d4ef6475 MR |
7137 | kvfree(pages); |
7138 | kvfree(vmas); | |
edafccee JA |
7139 | io_sqe_buffer_unregister(ctx); |
7140 | return ret; | |
7141 | } | |
7142 | ||
9b402849 JA |
7143 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7144 | { | |
7145 | __s32 __user *fds = arg; | |
7146 | int fd; | |
7147 | ||
7148 | if (ctx->cq_ev_fd) | |
7149 | return -EBUSY; | |
7150 | ||
7151 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7152 | return -EFAULT; | |
7153 | ||
7154 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7155 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7156 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7157 | ctx->cq_ev_fd = NULL; | |
7158 | return ret; | |
7159 | } | |
7160 | ||
7161 | return 0; | |
7162 | } | |
7163 | ||
7164 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7165 | { | |
7166 | if (ctx->cq_ev_fd) { | |
7167 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7168 | ctx->cq_ev_fd = NULL; | |
7169 | return 0; | |
7170 | } | |
7171 | ||
7172 | return -ENXIO; | |
7173 | } | |
7174 | ||
5a2e745d JA |
7175 | static int __io_destroy_buffers(int id, void *p, void *data) |
7176 | { | |
7177 | struct io_ring_ctx *ctx = data; | |
7178 | struct io_buffer *buf = p; | |
7179 | ||
067524e9 | 7180 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7181 | return 0; |
7182 | } | |
7183 | ||
7184 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7185 | { | |
7186 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7187 | idr_destroy(&ctx->io_buffer_idr); | |
7188 | } | |
7189 | ||
2b188cc1 JA |
7190 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7191 | { | |
6b06314c | 7192 | io_finish_async(ctx); |
2b188cc1 JA |
7193 | if (ctx->sqo_mm) |
7194 | mmdrop(ctx->sqo_mm); | |
def596e9 JA |
7195 | |
7196 | io_iopoll_reap_events(ctx); | |
edafccee | 7197 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7198 | io_sqe_files_unregister(ctx); |
9b402849 | 7199 | io_eventfd_unregister(ctx); |
5a2e745d | 7200 | io_destroy_buffers(ctx); |
41726c9a | 7201 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7202 | |
2b188cc1 | 7203 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7204 | if (ctx->ring_sock) { |
7205 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7206 | sock_release(ctx->ring_sock); |
355e8d26 | 7207 | } |
2b188cc1 JA |
7208 | #endif |
7209 | ||
75b28aff | 7210 | io_mem_free(ctx->rings); |
2b188cc1 | 7211 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7212 | |
7213 | percpu_ref_exit(&ctx->refs); | |
7214 | if (ctx->account_mem) | |
7215 | io_unaccount_mem(ctx->user, | |
7216 | ring_pages(ctx->sq_entries, ctx->cq_entries)); | |
7217 | free_uid(ctx->user); | |
181e448d | 7218 | put_cred(ctx->creds); |
206aefde | 7219 | kfree(ctx->completions); |
78076bb6 | 7220 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7221 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7222 | kfree(ctx); |
7223 | } | |
7224 | ||
7225 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7226 | { | |
7227 | struct io_ring_ctx *ctx = file->private_data; | |
7228 | __poll_t mask = 0; | |
7229 | ||
7230 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7231 | /* |
7232 | * synchronizes with barrier from wq_has_sleeper call in | |
7233 | * io_commit_cqring | |
7234 | */ | |
2b188cc1 | 7235 | smp_rmb(); |
75b28aff HV |
7236 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7237 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7238 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7239 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7240 | mask |= EPOLLIN | EPOLLRDNORM; |
7241 | ||
7242 | return mask; | |
7243 | } | |
7244 | ||
7245 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7246 | { | |
7247 | struct io_ring_ctx *ctx = file->private_data; | |
7248 | ||
7249 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7250 | } | |
7251 | ||
071698e1 JA |
7252 | static int io_remove_personalities(int id, void *p, void *data) |
7253 | { | |
7254 | struct io_ring_ctx *ctx = data; | |
7255 | const struct cred *cred; | |
7256 | ||
7257 | cred = idr_remove(&ctx->personality_idr, id); | |
7258 | if (cred) | |
7259 | put_cred(cred); | |
7260 | return 0; | |
7261 | } | |
7262 | ||
2b188cc1 JA |
7263 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7264 | { | |
7265 | mutex_lock(&ctx->uring_lock); | |
7266 | percpu_ref_kill(&ctx->refs); | |
7267 | mutex_unlock(&ctx->uring_lock); | |
7268 | ||
df069d80 JA |
7269 | /* |
7270 | * Wait for sq thread to idle, if we have one. It won't spin on new | |
7271 | * work after we've killed the ctx ref above. This is important to do | |
7272 | * before we cancel existing commands, as the thread could otherwise | |
7273 | * be queueing new work post that. If that's work we need to cancel, | |
7274 | * it could cause shutdown to hang. | |
7275 | */ | |
7276 | while (ctx->sqo_thread && !wq_has_sleeper(&ctx->sqo_wait)) | |
7277 | cpu_relax(); | |
7278 | ||
5262f567 | 7279 | io_kill_timeouts(ctx); |
221c5eb2 | 7280 | io_poll_remove_all(ctx); |
561fb04a JA |
7281 | |
7282 | if (ctx->io_wq) | |
7283 | io_wq_cancel_all(ctx->io_wq); | |
7284 | ||
def596e9 | 7285 | io_iopoll_reap_events(ctx); |
15dff286 JA |
7286 | /* if we failed setting up the ctx, we might not have any rings */ |
7287 | if (ctx->rings) | |
7288 | io_cqring_overflow_flush(ctx, true); | |
071698e1 | 7289 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
206aefde | 7290 | wait_for_completion(&ctx->completions[0]); |
2b188cc1 JA |
7291 | io_ring_ctx_free(ctx); |
7292 | } | |
7293 | ||
7294 | static int io_uring_release(struct inode *inode, struct file *file) | |
7295 | { | |
7296 | struct io_ring_ctx *ctx = file->private_data; | |
7297 | ||
7298 | file->private_data = NULL; | |
7299 | io_ring_ctx_wait_and_kill(ctx); | |
7300 | return 0; | |
7301 | } | |
7302 | ||
fcb323cc JA |
7303 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7304 | struct files_struct *files) | |
7305 | { | |
7306 | struct io_kiocb *req; | |
7307 | DEFINE_WAIT(wait); | |
7308 | ||
7309 | while (!list_empty_careful(&ctx->inflight_list)) { | |
768134d4 | 7310 | struct io_kiocb *cancel_req = NULL; |
fcb323cc JA |
7311 | |
7312 | spin_lock_irq(&ctx->inflight_lock); | |
7313 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7314 | if (req->work.files != files) |
7315 | continue; | |
7316 | /* req is being completed, ignore */ | |
7317 | if (!refcount_inc_not_zero(&req->refs)) | |
7318 | continue; | |
7319 | cancel_req = req; | |
7320 | break; | |
fcb323cc | 7321 | } |
768134d4 | 7322 | if (cancel_req) |
fcb323cc | 7323 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7324 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7325 | spin_unlock_irq(&ctx->inflight_lock); |
7326 | ||
768134d4 JA |
7327 | /* We need to keep going until we don't find a matching req */ |
7328 | if (!cancel_req) | |
fcb323cc | 7329 | break; |
2f6d9b9d | 7330 | |
2ca10259 JA |
7331 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7332 | spin_lock_irq(&ctx->completion_lock); | |
7333 | list_del(&cancel_req->list); | |
7334 | cancel_req->flags &= ~REQ_F_OVERFLOW; | |
7335 | if (list_empty(&ctx->cq_overflow_list)) { | |
7336 | clear_bit(0, &ctx->sq_check_overflow); | |
7337 | clear_bit(0, &ctx->cq_check_overflow); | |
7338 | } | |
7339 | spin_unlock_irq(&ctx->completion_lock); | |
7340 | ||
7341 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7342 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7343 | ||
7344 | /* | |
7345 | * Put inflight ref and overflow ref. If that's | |
7346 | * all we had, then we're done with this request. | |
7347 | */ | |
7348 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
7349 | io_put_req(cancel_req); | |
7350 | continue; | |
7351 | } | |
7352 | } | |
7353 | ||
2f6d9b9d BL |
7354 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); |
7355 | io_put_req(cancel_req); | |
fcb323cc JA |
7356 | schedule(); |
7357 | } | |
768134d4 | 7358 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7359 | } |
7360 | ||
7361 | static int io_uring_flush(struct file *file, void *data) | |
7362 | { | |
7363 | struct io_ring_ctx *ctx = file->private_data; | |
7364 | ||
7365 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7366 | |
7367 | /* | |
7368 | * If the task is going away, cancel work it may have pending | |
7369 | */ | |
7370 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) | |
7371 | io_wq_cancel_pid(ctx->io_wq, task_pid_vnr(current)); | |
7372 | ||
fcb323cc JA |
7373 | return 0; |
7374 | } | |
7375 | ||
6c5c240e RP |
7376 | static void *io_uring_validate_mmap_request(struct file *file, |
7377 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7378 | { |
2b188cc1 | 7379 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7380 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7381 | struct page *page; |
7382 | void *ptr; | |
7383 | ||
7384 | switch (offset) { | |
7385 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7386 | case IORING_OFF_CQ_RING: |
7387 | ptr = ctx->rings; | |
2b188cc1 JA |
7388 | break; |
7389 | case IORING_OFF_SQES: | |
7390 | ptr = ctx->sq_sqes; | |
7391 | break; | |
2b188cc1 | 7392 | default: |
6c5c240e | 7393 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7394 | } |
7395 | ||
7396 | page = virt_to_head_page(ptr); | |
a50b854e | 7397 | if (sz > page_size(page)) |
6c5c240e RP |
7398 | return ERR_PTR(-EINVAL); |
7399 | ||
7400 | return ptr; | |
7401 | } | |
7402 | ||
7403 | #ifdef CONFIG_MMU | |
7404 | ||
7405 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7406 | { | |
7407 | size_t sz = vma->vm_end - vma->vm_start; | |
7408 | unsigned long pfn; | |
7409 | void *ptr; | |
7410 | ||
7411 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7412 | if (IS_ERR(ptr)) | |
7413 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7414 | |
7415 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7416 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7417 | } | |
7418 | ||
6c5c240e RP |
7419 | #else /* !CONFIG_MMU */ |
7420 | ||
7421 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7422 | { | |
7423 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7424 | } | |
7425 | ||
7426 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7427 | { | |
7428 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7429 | } | |
7430 | ||
7431 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7432 | unsigned long addr, unsigned long len, | |
7433 | unsigned long pgoff, unsigned long flags) | |
7434 | { | |
7435 | void *ptr; | |
7436 | ||
7437 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7438 | if (IS_ERR(ptr)) | |
7439 | return PTR_ERR(ptr); | |
7440 | ||
7441 | return (unsigned long) ptr; | |
7442 | } | |
7443 | ||
7444 | #endif /* !CONFIG_MMU */ | |
7445 | ||
2b188cc1 JA |
7446 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7447 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7448 | size_t, sigsz) | |
7449 | { | |
7450 | struct io_ring_ctx *ctx; | |
7451 | long ret = -EBADF; | |
7452 | int submitted = 0; | |
7453 | struct fd f; | |
7454 | ||
b41e9852 JA |
7455 | if (current->task_works) |
7456 | task_work_run(); | |
7457 | ||
6c271ce2 | 7458 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7459 | return -EINVAL; |
7460 | ||
7461 | f = fdget(fd); | |
7462 | if (!f.file) | |
7463 | return -EBADF; | |
7464 | ||
7465 | ret = -EOPNOTSUPP; | |
7466 | if (f.file->f_op != &io_uring_fops) | |
7467 | goto out_fput; | |
7468 | ||
7469 | ret = -ENXIO; | |
7470 | ctx = f.file->private_data; | |
7471 | if (!percpu_ref_tryget(&ctx->refs)) | |
7472 | goto out_fput; | |
7473 | ||
6c271ce2 JA |
7474 | /* |
7475 | * For SQ polling, the thread will do all submissions and completions. | |
7476 | * Just return the requested submit count, and wake the thread if | |
7477 | * we were asked to. | |
7478 | */ | |
b2a9eada | 7479 | ret = 0; |
6c271ce2 | 7480 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
7481 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
7482 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
7483 | if (flags & IORING_ENTER_SQ_WAKEUP) |
7484 | wake_up(&ctx->sqo_wait); | |
7485 | submitted = to_submit; | |
b2a9eada | 7486 | } else if (to_submit) { |
ae9428ca | 7487 | struct mm_struct *cur_mm; |
2b188cc1 JA |
7488 | |
7489 | mutex_lock(&ctx->uring_lock); | |
ae9428ca PB |
7490 | /* already have mm, so io_submit_sqes() won't try to grab it */ |
7491 | cur_mm = ctx->sqo_mm; | |
7492 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd, | |
7493 | &cur_mm, false); | |
2b188cc1 | 7494 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
7495 | |
7496 | if (submitted != to_submit) | |
7497 | goto out; | |
2b188cc1 JA |
7498 | } |
7499 | if (flags & IORING_ENTER_GETEVENTS) { | |
def596e9 JA |
7500 | unsigned nr_events = 0; |
7501 | ||
2b188cc1 JA |
7502 | min_complete = min(min_complete, ctx->cq_entries); |
7503 | ||
32b2244a XW |
7504 | /* |
7505 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
7506 | * space applications don't need to do io completion events | |
7507 | * polling again, they can rely on io_sq_thread to do polling | |
7508 | * work, which can reduce cpu usage and uring_lock contention. | |
7509 | */ | |
7510 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
7511 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
def596e9 | 7512 | ret = io_iopoll_check(ctx, &nr_events, min_complete); |
def596e9 JA |
7513 | } else { |
7514 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
7515 | } | |
2b188cc1 JA |
7516 | } |
7517 | ||
7c504e65 | 7518 | out: |
6805b32e | 7519 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
7520 | out_fput: |
7521 | fdput(f); | |
7522 | return submitted ? submitted : ret; | |
7523 | } | |
7524 | ||
bebdb65e | 7525 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
7526 | static int io_uring_show_cred(int id, void *p, void *data) |
7527 | { | |
7528 | const struct cred *cred = p; | |
7529 | struct seq_file *m = data; | |
7530 | struct user_namespace *uns = seq_user_ns(m); | |
7531 | struct group_info *gi; | |
7532 | kernel_cap_t cap; | |
7533 | unsigned __capi; | |
7534 | int g; | |
7535 | ||
7536 | seq_printf(m, "%5d\n", id); | |
7537 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
7538 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
7539 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
7540 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
7541 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
7542 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
7543 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
7544 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
7545 | seq_puts(m, "\n\tGroups:\t"); | |
7546 | gi = cred->group_info; | |
7547 | for (g = 0; g < gi->ngroups; g++) { | |
7548 | seq_put_decimal_ull(m, g ? " " : "", | |
7549 | from_kgid_munged(uns, gi->gid[g])); | |
7550 | } | |
7551 | seq_puts(m, "\n\tCapEff:\t"); | |
7552 | cap = cred->cap_effective; | |
7553 | CAP_FOR_EACH_U32(__capi) | |
7554 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
7555 | seq_putc(m, '\n'); | |
7556 | return 0; | |
7557 | } | |
7558 | ||
7559 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
7560 | { | |
7561 | int i; | |
7562 | ||
7563 | mutex_lock(&ctx->uring_lock); | |
7564 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
7565 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7566 | struct fixed_file_table *table; | |
7567 | struct file *f; | |
7568 | ||
7569 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7570 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
7571 | if (f) | |
7572 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
7573 | else | |
7574 | seq_printf(m, "%5u: <none>\n", i); | |
7575 | } | |
7576 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
7577 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7578 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
7579 | ||
7580 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
7581 | (unsigned int) buf->len); | |
7582 | } | |
7583 | if (!idr_is_empty(&ctx->personality_idr)) { | |
7584 | seq_printf(m, "Personalities:\n"); | |
7585 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
7586 | } | |
d7718a9d JA |
7587 | seq_printf(m, "PollList:\n"); |
7588 | spin_lock_irq(&ctx->completion_lock); | |
7589 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7590 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
7591 | struct io_kiocb *req; | |
7592 | ||
7593 | hlist_for_each_entry(req, list, hash_node) | |
7594 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7595 | req->task->task_works != NULL); | |
7596 | } | |
7597 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
7598 | mutex_unlock(&ctx->uring_lock); |
7599 | } | |
7600 | ||
7601 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
7602 | { | |
7603 | struct io_ring_ctx *ctx = f->private_data; | |
7604 | ||
7605 | if (percpu_ref_tryget(&ctx->refs)) { | |
7606 | __io_uring_show_fdinfo(ctx, m); | |
7607 | percpu_ref_put(&ctx->refs); | |
7608 | } | |
7609 | } | |
bebdb65e | 7610 | #endif |
87ce955b | 7611 | |
2b188cc1 JA |
7612 | static const struct file_operations io_uring_fops = { |
7613 | .release = io_uring_release, | |
fcb323cc | 7614 | .flush = io_uring_flush, |
2b188cc1 | 7615 | .mmap = io_uring_mmap, |
6c5c240e RP |
7616 | #ifndef CONFIG_MMU |
7617 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
7618 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
7619 | #endif | |
2b188cc1 JA |
7620 | .poll = io_uring_poll, |
7621 | .fasync = io_uring_fasync, | |
bebdb65e | 7622 | #ifdef CONFIG_PROC_FS |
87ce955b | 7623 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 7624 | #endif |
2b188cc1 JA |
7625 | }; |
7626 | ||
7627 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
7628 | struct io_uring_params *p) | |
7629 | { | |
75b28aff HV |
7630 | struct io_rings *rings; |
7631 | size_t size, sq_array_offset; | |
2b188cc1 | 7632 | |
75b28aff HV |
7633 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
7634 | if (size == SIZE_MAX) | |
7635 | return -EOVERFLOW; | |
7636 | ||
7637 | rings = io_mem_alloc(size); | |
7638 | if (!rings) | |
2b188cc1 JA |
7639 | return -ENOMEM; |
7640 | ||
75b28aff HV |
7641 | ctx->rings = rings; |
7642 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
7643 | rings->sq_ring_mask = p->sq_entries - 1; | |
7644 | rings->cq_ring_mask = p->cq_entries - 1; | |
7645 | rings->sq_ring_entries = p->sq_entries; | |
7646 | rings->cq_ring_entries = p->cq_entries; | |
7647 | ctx->sq_mask = rings->sq_ring_mask; | |
7648 | ctx->cq_mask = rings->cq_ring_mask; | |
7649 | ctx->sq_entries = rings->sq_ring_entries; | |
7650 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
7651 | |
7652 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
7653 | if (size == SIZE_MAX) { |
7654 | io_mem_free(ctx->rings); | |
7655 | ctx->rings = NULL; | |
2b188cc1 | 7656 | return -EOVERFLOW; |
eb065d30 | 7657 | } |
2b188cc1 JA |
7658 | |
7659 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
7660 | if (!ctx->sq_sqes) { |
7661 | io_mem_free(ctx->rings); | |
7662 | ctx->rings = NULL; | |
2b188cc1 | 7663 | return -ENOMEM; |
eb065d30 | 7664 | } |
2b188cc1 | 7665 | |
2b188cc1 JA |
7666 | return 0; |
7667 | } | |
7668 | ||
7669 | /* | |
7670 | * Allocate an anonymous fd, this is what constitutes the application | |
7671 | * visible backing of an io_uring instance. The application mmaps this | |
7672 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
7673 | * we have to tie this fd to a socket for file garbage collection purposes. | |
7674 | */ | |
7675 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
7676 | { | |
7677 | struct file *file; | |
7678 | int ret; | |
7679 | ||
7680 | #if defined(CONFIG_UNIX) | |
7681 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
7682 | &ctx->ring_sock); | |
7683 | if (ret) | |
7684 | return ret; | |
7685 | #endif | |
7686 | ||
7687 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
7688 | if (ret < 0) | |
7689 | goto err; | |
7690 | ||
7691 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
7692 | O_RDWR | O_CLOEXEC); | |
7693 | if (IS_ERR(file)) { | |
7694 | put_unused_fd(ret); | |
7695 | ret = PTR_ERR(file); | |
7696 | goto err; | |
7697 | } | |
7698 | ||
7699 | #if defined(CONFIG_UNIX) | |
7700 | ctx->ring_sock->file = file; | |
7701 | #endif | |
7702 | fd_install(ret, file); | |
7703 | return ret; | |
7704 | err: | |
7705 | #if defined(CONFIG_UNIX) | |
7706 | sock_release(ctx->ring_sock); | |
7707 | ctx->ring_sock = NULL; | |
7708 | #endif | |
7709 | return ret; | |
7710 | } | |
7711 | ||
7712 | static int io_uring_create(unsigned entries, struct io_uring_params *p) | |
7713 | { | |
7714 | struct user_struct *user = NULL; | |
7715 | struct io_ring_ctx *ctx; | |
7716 | bool account_mem; | |
7717 | int ret; | |
7718 | ||
8110c1a6 | 7719 | if (!entries) |
2b188cc1 | 7720 | return -EINVAL; |
8110c1a6 JA |
7721 | if (entries > IORING_MAX_ENTRIES) { |
7722 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7723 | return -EINVAL; | |
7724 | entries = IORING_MAX_ENTRIES; | |
7725 | } | |
2b188cc1 JA |
7726 | |
7727 | /* | |
7728 | * Use twice as many entries for the CQ ring. It's possible for the | |
7729 | * application to drive a higher depth than the size of the SQ ring, | |
7730 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
7731 | * some flexibility in overcommitting a bit. If the application has |
7732 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
7733 | * of CQ ring entries manually. | |
2b188cc1 JA |
7734 | */ |
7735 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
7736 | if (p->flags & IORING_SETUP_CQSIZE) { |
7737 | /* | |
7738 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
7739 | * to a power-of-two, if it isn't already. We do NOT impose | |
7740 | * any cq vs sq ring sizing. | |
7741 | */ | |
8110c1a6 | 7742 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 7743 | return -EINVAL; |
8110c1a6 JA |
7744 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
7745 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7746 | return -EINVAL; | |
7747 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
7748 | } | |
33a107f0 JA |
7749 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
7750 | } else { | |
7751 | p->cq_entries = 2 * p->sq_entries; | |
7752 | } | |
2b188cc1 JA |
7753 | |
7754 | user = get_uid(current_user()); | |
7755 | account_mem = !capable(CAP_IPC_LOCK); | |
7756 | ||
7757 | if (account_mem) { | |
7758 | ret = io_account_mem(user, | |
7759 | ring_pages(p->sq_entries, p->cq_entries)); | |
7760 | if (ret) { | |
7761 | free_uid(user); | |
7762 | return ret; | |
7763 | } | |
7764 | } | |
7765 | ||
7766 | ctx = io_ring_ctx_alloc(p); | |
7767 | if (!ctx) { | |
7768 | if (account_mem) | |
7769 | io_unaccount_mem(user, ring_pages(p->sq_entries, | |
7770 | p->cq_entries)); | |
7771 | free_uid(user); | |
7772 | return -ENOMEM; | |
7773 | } | |
7774 | ctx->compat = in_compat_syscall(); | |
7775 | ctx->account_mem = account_mem; | |
7776 | ctx->user = user; | |
0b8c0ec7 | 7777 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
7778 | |
7779 | ret = io_allocate_scq_urings(ctx, p); | |
7780 | if (ret) | |
7781 | goto err; | |
7782 | ||
6c271ce2 | 7783 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
7784 | if (ret) |
7785 | goto err; | |
7786 | ||
2b188cc1 | 7787 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
7788 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
7789 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
7790 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
7791 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
7792 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
7793 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
7794 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
7795 | |
7796 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
7797 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
7798 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
7799 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
7800 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
7801 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
7802 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
ac90f249 | 7803 | |
044c1ab3 JA |
7804 | /* |
7805 | * Install ring fd as the very last thing, so we don't risk someone | |
7806 | * having closed it before we finish setup | |
7807 | */ | |
7808 | ret = io_uring_get_fd(ctx); | |
7809 | if (ret < 0) | |
7810 | goto err; | |
7811 | ||
da8c9690 | 7812 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
cccf0ee8 | 7813 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | |
d7718a9d | 7814 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; |
c826bd7a | 7815 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
7816 | return ret; |
7817 | err: | |
7818 | io_ring_ctx_wait_and_kill(ctx); | |
7819 | return ret; | |
7820 | } | |
7821 | ||
7822 | /* | |
7823 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
7824 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
7825 | * params structure passed in. | |
7826 | */ | |
7827 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
7828 | { | |
7829 | struct io_uring_params p; | |
7830 | long ret; | |
7831 | int i; | |
7832 | ||
7833 | if (copy_from_user(&p, params, sizeof(p))) | |
7834 | return -EFAULT; | |
7835 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
7836 | if (p.resv[i]) | |
7837 | return -EINVAL; | |
7838 | } | |
7839 | ||
6c271ce2 | 7840 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 7841 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 7842 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
7843 | return -EINVAL; |
7844 | ||
7845 | ret = io_uring_create(entries, &p); | |
7846 | if (ret < 0) | |
7847 | return ret; | |
7848 | ||
7849 | if (copy_to_user(params, &p, sizeof(p))) | |
7850 | return -EFAULT; | |
7851 | ||
7852 | return ret; | |
7853 | } | |
7854 | ||
7855 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
7856 | struct io_uring_params __user *, params) | |
7857 | { | |
7858 | return io_uring_setup(entries, params); | |
7859 | } | |
7860 | ||
66f4af93 JA |
7861 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
7862 | { | |
7863 | struct io_uring_probe *p; | |
7864 | size_t size; | |
7865 | int i, ret; | |
7866 | ||
7867 | size = struct_size(p, ops, nr_args); | |
7868 | if (size == SIZE_MAX) | |
7869 | return -EOVERFLOW; | |
7870 | p = kzalloc(size, GFP_KERNEL); | |
7871 | if (!p) | |
7872 | return -ENOMEM; | |
7873 | ||
7874 | ret = -EFAULT; | |
7875 | if (copy_from_user(p, arg, size)) | |
7876 | goto out; | |
7877 | ret = -EINVAL; | |
7878 | if (memchr_inv(p, 0, size)) | |
7879 | goto out; | |
7880 | ||
7881 | p->last_op = IORING_OP_LAST - 1; | |
7882 | if (nr_args > IORING_OP_LAST) | |
7883 | nr_args = IORING_OP_LAST; | |
7884 | ||
7885 | for (i = 0; i < nr_args; i++) { | |
7886 | p->ops[i].op = i; | |
7887 | if (!io_op_defs[i].not_supported) | |
7888 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
7889 | } | |
7890 | p->ops_len = i; | |
7891 | ||
7892 | ret = 0; | |
7893 | if (copy_to_user(arg, p, size)) | |
7894 | ret = -EFAULT; | |
7895 | out: | |
7896 | kfree(p); | |
7897 | return ret; | |
7898 | } | |
7899 | ||
071698e1 JA |
7900 | static int io_register_personality(struct io_ring_ctx *ctx) |
7901 | { | |
7902 | const struct cred *creds = get_current_cred(); | |
7903 | int id; | |
7904 | ||
7905 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
7906 | USHRT_MAX, GFP_KERNEL); | |
7907 | if (id < 0) | |
7908 | put_cred(creds); | |
7909 | return id; | |
7910 | } | |
7911 | ||
7912 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
7913 | { | |
7914 | const struct cred *old_creds; | |
7915 | ||
7916 | old_creds = idr_remove(&ctx->personality_idr, id); | |
7917 | if (old_creds) { | |
7918 | put_cred(old_creds); | |
7919 | return 0; | |
7920 | } | |
7921 | ||
7922 | return -EINVAL; | |
7923 | } | |
7924 | ||
7925 | static bool io_register_op_must_quiesce(int op) | |
7926 | { | |
7927 | switch (op) { | |
7928 | case IORING_UNREGISTER_FILES: | |
7929 | case IORING_REGISTER_FILES_UPDATE: | |
7930 | case IORING_REGISTER_PROBE: | |
7931 | case IORING_REGISTER_PERSONALITY: | |
7932 | case IORING_UNREGISTER_PERSONALITY: | |
7933 | return false; | |
7934 | default: | |
7935 | return true; | |
7936 | } | |
7937 | } | |
7938 | ||
edafccee JA |
7939 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
7940 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
7941 | __releases(ctx->uring_lock) |
7942 | __acquires(ctx->uring_lock) | |
edafccee JA |
7943 | { |
7944 | int ret; | |
7945 | ||
35fa71a0 JA |
7946 | /* |
7947 | * We're inside the ring mutex, if the ref is already dying, then | |
7948 | * someone else killed the ctx or is already going through | |
7949 | * io_uring_register(). | |
7950 | */ | |
7951 | if (percpu_ref_is_dying(&ctx->refs)) | |
7952 | return -ENXIO; | |
7953 | ||
071698e1 | 7954 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 7955 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 7956 | |
05f3fb3c JA |
7957 | /* |
7958 | * Drop uring mutex before waiting for references to exit. If | |
7959 | * another thread is currently inside io_uring_enter() it might | |
7960 | * need to grab the uring_lock to make progress. If we hold it | |
7961 | * here across the drain wait, then we can deadlock. It's safe | |
7962 | * to drop the mutex here, since no new references will come in | |
7963 | * after we've killed the percpu ref. | |
7964 | */ | |
7965 | mutex_unlock(&ctx->uring_lock); | |
c150368b | 7966 | ret = wait_for_completion_interruptible(&ctx->completions[0]); |
05f3fb3c | 7967 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
7968 | if (ret) { |
7969 | percpu_ref_resurrect(&ctx->refs); | |
7970 | ret = -EINTR; | |
7971 | goto out; | |
7972 | } | |
05f3fb3c | 7973 | } |
edafccee JA |
7974 | |
7975 | switch (opcode) { | |
7976 | case IORING_REGISTER_BUFFERS: | |
7977 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
7978 | break; | |
7979 | case IORING_UNREGISTER_BUFFERS: | |
7980 | ret = -EINVAL; | |
7981 | if (arg || nr_args) | |
7982 | break; | |
7983 | ret = io_sqe_buffer_unregister(ctx); | |
7984 | break; | |
6b06314c JA |
7985 | case IORING_REGISTER_FILES: |
7986 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
7987 | break; | |
7988 | case IORING_UNREGISTER_FILES: | |
7989 | ret = -EINVAL; | |
7990 | if (arg || nr_args) | |
7991 | break; | |
7992 | ret = io_sqe_files_unregister(ctx); | |
7993 | break; | |
c3a31e60 JA |
7994 | case IORING_REGISTER_FILES_UPDATE: |
7995 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
7996 | break; | |
9b402849 | 7997 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 7998 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
7999 | ret = -EINVAL; |
8000 | if (nr_args != 1) | |
8001 | break; | |
8002 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8003 | if (ret) |
8004 | break; | |
8005 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8006 | ctx->eventfd_async = 1; | |
8007 | else | |
8008 | ctx->eventfd_async = 0; | |
9b402849 JA |
8009 | break; |
8010 | case IORING_UNREGISTER_EVENTFD: | |
8011 | ret = -EINVAL; | |
8012 | if (arg || nr_args) | |
8013 | break; | |
8014 | ret = io_eventfd_unregister(ctx); | |
8015 | break; | |
66f4af93 JA |
8016 | case IORING_REGISTER_PROBE: |
8017 | ret = -EINVAL; | |
8018 | if (!arg || nr_args > 256) | |
8019 | break; | |
8020 | ret = io_probe(ctx, arg, nr_args); | |
8021 | break; | |
071698e1 JA |
8022 | case IORING_REGISTER_PERSONALITY: |
8023 | ret = -EINVAL; | |
8024 | if (arg || nr_args) | |
8025 | break; | |
8026 | ret = io_register_personality(ctx); | |
8027 | break; | |
8028 | case IORING_UNREGISTER_PERSONALITY: | |
8029 | ret = -EINVAL; | |
8030 | if (arg) | |
8031 | break; | |
8032 | ret = io_unregister_personality(ctx, nr_args); | |
8033 | break; | |
edafccee JA |
8034 | default: |
8035 | ret = -EINVAL; | |
8036 | break; | |
8037 | } | |
8038 | ||
071698e1 | 8039 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8040 | /* bring the ctx back to life */ |
05f3fb3c | 8041 | percpu_ref_reinit(&ctx->refs); |
c150368b JA |
8042 | out: |
8043 | reinit_completion(&ctx->completions[0]); | |
05f3fb3c | 8044 | } |
edafccee JA |
8045 | return ret; |
8046 | } | |
8047 | ||
8048 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8049 | void __user *, arg, unsigned int, nr_args) | |
8050 | { | |
8051 | struct io_ring_ctx *ctx; | |
8052 | long ret = -EBADF; | |
8053 | struct fd f; | |
8054 | ||
8055 | f = fdget(fd); | |
8056 | if (!f.file) | |
8057 | return -EBADF; | |
8058 | ||
8059 | ret = -EOPNOTSUPP; | |
8060 | if (f.file->f_op != &io_uring_fops) | |
8061 | goto out_fput; | |
8062 | ||
8063 | ctx = f.file->private_data; | |
8064 | ||
8065 | mutex_lock(&ctx->uring_lock); | |
8066 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8067 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8068 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8069 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8070 | out_fput: |
8071 | fdput(f); | |
8072 | return ret; | |
8073 | } | |
8074 | ||
2b188cc1 JA |
8075 | static int __init io_uring_init(void) |
8076 | { | |
d7f62e82 SM |
8077 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8078 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8079 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8080 | } while (0) | |
8081 | ||
8082 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8083 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8084 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8085 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8086 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8087 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8088 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8089 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8090 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8091 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8092 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8093 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8094 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8095 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8096 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8097 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
8098 | BUILD_BUG_SQE_ELEM(28, __u16, poll_events); | |
8099 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); | |
8100 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8101 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8102 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8103 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8104 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8105 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8106 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8107 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8108 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8109 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8110 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8111 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8112 | |
d3656344 | 8113 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8114 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8115 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8116 | return 0; | |
8117 | }; | |
8118 | __initcall(io_uring_init); |