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59915143 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/kernel.h> | |
3 | #include <linux/errno.h> | |
4 | #include <linux/file.h> | |
5 | #include <linux/io_uring.h> | |
6 | ||
7 | #include <trace/events/io_uring.h> | |
8 | ||
9 | #include <uapi/linux/io_uring.h> | |
10 | ||
59915143 JA |
11 | #include "io_uring.h" |
12 | #include "refs.h" | |
7aaff708 | 13 | #include "cancel.h" |
59915143 JA |
14 | #include "timeout.h" |
15 | ||
16 | struct io_timeout { | |
17 | struct file *file; | |
18 | u32 off; | |
19 | u32 target_seq; | |
20 | struct list_head list; | |
21 | /* head of the link, used by linked timeouts only */ | |
22 | struct io_kiocb *head; | |
23 | /* for linked completions */ | |
24 | struct io_kiocb *prev; | |
25 | }; | |
26 | ||
27 | struct io_timeout_rem { | |
28 | struct file *file; | |
29 | u64 addr; | |
30 | ||
31 | /* timeout update */ | |
32 | struct timespec64 ts; | |
33 | u32 flags; | |
34 | bool ltimeout; | |
35 | }; | |
36 | ||
37 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) | |
38 | { | |
f2ccb5ae | 39 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
40 | |
41 | return !timeout->off; | |
42 | } | |
43 | ||
44 | static inline void io_put_req(struct io_kiocb *req) | |
45 | { | |
46 | if (req_ref_put_and_test(req)) { | |
47 | io_queue_next(req); | |
48 | io_free_req(req); | |
49 | } | |
50 | } | |
51 | ||
ba3cdb6f | 52 | static bool io_kill_timeout(struct io_kiocb *req, int status) |
59915143 JA |
53 | __must_hold(&req->ctx->timeout_lock) |
54 | { | |
55 | struct io_timeout_data *io = req->async_data; | |
56 | ||
57 | if (hrtimer_try_to_cancel(&io->timer) != -1) { | |
f2ccb5ae | 58 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
59 | |
60 | if (status) | |
61 | req_set_fail(req); | |
62 | atomic_set(&req->ctx->cq_timeouts, | |
63 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
64 | list_del_init(&timeout->list); | |
833b5dff | 65 | io_req_queue_tw_complete(req, status); |
ba3cdb6f | 66 | return true; |
59915143 | 67 | } |
ba3cdb6f | 68 | return false; |
59915143 JA |
69 | } |
70 | ||
71 | __cold void io_flush_timeouts(struct io_ring_ctx *ctx) | |
59915143 | 72 | { |
ea011ee1 | 73 | u32 seq; |
59915143 JA |
74 | struct io_timeout *timeout, *tmp; |
75 | ||
76 | spin_lock_irq(&ctx->timeout_lock); | |
ea011ee1 PB |
77 | seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
78 | ||
59915143 JA |
79 | list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) { |
80 | struct io_kiocb *req = cmd_to_io_kiocb(timeout); | |
81 | u32 events_needed, events_got; | |
82 | ||
83 | if (io_is_timeout_noseq(req)) | |
84 | break; | |
85 | ||
86 | /* | |
87 | * Since seq can easily wrap around over time, subtract | |
88 | * the last seq at which timeouts were flushed before comparing. | |
89 | * Assuming not more than 2^31-1 events have happened since, | |
90 | * these subtractions won't have wrapped, so we can check if | |
91 | * target is in [last_seq, current_seq] by comparing the two. | |
92 | */ | |
93 | events_needed = timeout->target_seq - ctx->cq_last_tm_flush; | |
94 | events_got = seq - ctx->cq_last_tm_flush; | |
95 | if (events_got < events_needed) | |
96 | break; | |
97 | ||
98 | io_kill_timeout(req, 0); | |
99 | } | |
100 | ctx->cq_last_tm_flush = seq; | |
101 | spin_unlock_irq(&ctx->timeout_lock); | |
102 | } | |
103 | ||
a282967c | 104 | static void io_req_tw_fail_links(struct io_kiocb *link, struct io_tw_state *ts) |
59915143 | 105 | { |
a282967c | 106 | io_tw_lock(link->ctx, ts); |
59915143 | 107 | while (link) { |
37c7bd31 | 108 | struct io_kiocb *nxt = link->link; |
59915143 JA |
109 | long res = -ECANCELED; |
110 | ||
111 | if (link->flags & REQ_F_FAIL) | |
112 | res = link->cqe.res; | |
59915143 | 113 | link->link = NULL; |
37c7bd31 | 114 | io_req_set_res(link, res, 0); |
a282967c | 115 | io_req_task_complete(link, ts); |
37c7bd31 PB |
116 | link = nxt; |
117 | } | |
118 | } | |
59915143 | 119 | |
37c7bd31 PB |
120 | static void io_fail_links(struct io_kiocb *req) |
121 | __must_hold(&req->ctx->completion_lock) | |
122 | { | |
123 | struct io_kiocb *link = req->link; | |
124 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; | |
125 | ||
126 | if (!link) | |
127 | return; | |
59915143 | 128 | |
37c7bd31 | 129 | while (link) { |
59915143 JA |
130 | if (ignore_cqes) |
131 | link->flags |= REQ_F_CQE_SKIP; | |
132 | else | |
133 | link->flags &= ~REQ_F_CQE_SKIP; | |
37c7bd31 PB |
134 | trace_io_uring_fail_link(req, link); |
135 | link = link->link; | |
59915143 | 136 | } |
37c7bd31 PB |
137 | |
138 | link = req->link; | |
139 | link->io_task_work.func = io_req_tw_fail_links; | |
140 | io_req_task_work_add(link); | |
141 | req->link = NULL; | |
59915143 JA |
142 | } |
143 | ||
144 | static inline void io_remove_next_linked(struct io_kiocb *req) | |
145 | { | |
146 | struct io_kiocb *nxt = req->link; | |
147 | ||
148 | req->link = nxt->link; | |
149 | nxt->link = NULL; | |
150 | } | |
151 | ||
c0dc995e | 152 | void io_disarm_next(struct io_kiocb *req) |
59915143 JA |
153 | __must_hold(&req->ctx->completion_lock) |
154 | { | |
155 | struct io_kiocb *link = NULL; | |
59915143 JA |
156 | |
157 | if (req->flags & REQ_F_ARM_LTIMEOUT) { | |
158 | link = req->link; | |
159 | req->flags &= ~REQ_F_ARM_LTIMEOUT; | |
160 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { | |
161 | io_remove_next_linked(req); | |
833b5dff | 162 | io_req_queue_tw_complete(link, -ECANCELED); |
59915143 JA |
163 | } |
164 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
165 | struct io_ring_ctx *ctx = req->ctx; | |
166 | ||
167 | spin_lock_irq(&ctx->timeout_lock); | |
168 | link = io_disarm_linked_timeout(req); | |
169 | spin_unlock_irq(&ctx->timeout_lock); | |
c0dc995e | 170 | if (link) |
833b5dff | 171 | io_req_queue_tw_complete(link, -ECANCELED); |
59915143 JA |
172 | } |
173 | if (unlikely((req->flags & REQ_F_FAIL) && | |
c0dc995e | 174 | !(req->flags & REQ_F_HARDLINK))) |
59915143 | 175 | io_fail_links(req); |
59915143 JA |
176 | } |
177 | ||
178 | struct io_kiocb *__io_disarm_linked_timeout(struct io_kiocb *req, | |
179 | struct io_kiocb *link) | |
180 | __must_hold(&req->ctx->completion_lock) | |
181 | __must_hold(&req->ctx->timeout_lock) | |
182 | { | |
183 | struct io_timeout_data *io = link->async_data; | |
f2ccb5ae | 184 | struct io_timeout *timeout = io_kiocb_to_cmd(link, struct io_timeout); |
59915143 JA |
185 | |
186 | io_remove_next_linked(req); | |
187 | timeout->head = NULL; | |
188 | if (hrtimer_try_to_cancel(&io->timer) != -1) { | |
189 | list_del(&timeout->list); | |
190 | return link; | |
191 | } | |
192 | ||
193 | return NULL; | |
194 | } | |
195 | ||
196 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) | |
197 | { | |
198 | struct io_timeout_data *data = container_of(timer, | |
199 | struct io_timeout_data, timer); | |
200 | struct io_kiocb *req = data->req; | |
f2ccb5ae | 201 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
202 | struct io_ring_ctx *ctx = req->ctx; |
203 | unsigned long flags; | |
204 | ||
205 | spin_lock_irqsave(&ctx->timeout_lock, flags); | |
206 | list_del_init(&timeout->list); | |
207 | atomic_set(&req->ctx->cq_timeouts, | |
208 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
209 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
210 | ||
211 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) | |
212 | req_set_fail(req); | |
213 | ||
214 | io_req_set_res(req, -ETIME, 0); | |
215 | req->io_task_work.func = io_req_task_complete; | |
216 | io_req_task_work_add(req); | |
217 | return HRTIMER_NORESTART; | |
218 | } | |
219 | ||
220 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, | |
221 | struct io_cancel_data *cd) | |
222 | __must_hold(&ctx->timeout_lock) | |
223 | { | |
224 | struct io_timeout *timeout; | |
225 | struct io_timeout_data *io; | |
226 | struct io_kiocb *req = NULL; | |
227 | ||
228 | list_for_each_entry(timeout, &ctx->timeout_list, list) { | |
229 | struct io_kiocb *tmp = cmd_to_io_kiocb(timeout); | |
230 | ||
231 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && | |
232 | cd->data != tmp->cqe.user_data) | |
233 | continue; | |
234 | if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) { | |
235 | if (cd->seq == tmp->work.cancel_seq) | |
236 | continue; | |
237 | tmp->work.cancel_seq = cd->seq; | |
238 | } | |
239 | req = tmp; | |
240 | break; | |
241 | } | |
242 | if (!req) | |
243 | return ERR_PTR(-ENOENT); | |
244 | ||
245 | io = req->async_data; | |
246 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
247 | return ERR_PTR(-EALREADY); | |
f2ccb5ae | 248 | timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
249 | list_del_init(&timeout->list); |
250 | return req; | |
251 | } | |
252 | ||
253 | int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) | |
254 | __must_hold(&ctx->completion_lock) | |
255 | { | |
256 | struct io_kiocb *req; | |
257 | ||
258 | spin_lock_irq(&ctx->timeout_lock); | |
259 | req = io_timeout_extract(ctx, cd); | |
260 | spin_unlock_irq(&ctx->timeout_lock); | |
261 | ||
262 | if (IS_ERR(req)) | |
263 | return PTR_ERR(req); | |
264 | io_req_task_queue_fail(req, -ECANCELED); | |
265 | return 0; | |
266 | } | |
267 | ||
a282967c | 268 | static void io_req_task_link_timeout(struct io_kiocb *req, struct io_tw_state *ts) |
59915143 | 269 | { |
a282967c | 270 | unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; |
f2ccb5ae | 271 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
272 | struct io_kiocb *prev = timeout->prev; |
273 | int ret = -ENOENT; | |
274 | ||
275 | if (prev) { | |
276 | if (!(req->task->flags & PF_EXITING)) { | |
277 | struct io_cancel_data cd = { | |
278 | .ctx = req->ctx, | |
279 | .data = prev->cqe.user_data, | |
280 | }; | |
281 | ||
88f52eaa | 282 | ret = io_try_cancel(req->task->io_uring, &cd, issue_flags); |
59915143 JA |
283 | } |
284 | io_req_set_res(req, ret ?: -ETIME, 0); | |
a282967c | 285 | io_req_task_complete(req, ts); |
59915143 JA |
286 | io_put_req(prev); |
287 | } else { | |
288 | io_req_set_res(req, -ETIME, 0); | |
a282967c | 289 | io_req_task_complete(req, ts); |
59915143 JA |
290 | } |
291 | } | |
292 | ||
293 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) | |
294 | { | |
295 | struct io_timeout_data *data = container_of(timer, | |
296 | struct io_timeout_data, timer); | |
297 | struct io_kiocb *prev, *req = data->req; | |
f2ccb5ae | 298 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
299 | struct io_ring_ctx *ctx = req->ctx; |
300 | unsigned long flags; | |
301 | ||
302 | spin_lock_irqsave(&ctx->timeout_lock, flags); | |
303 | prev = timeout->head; | |
304 | timeout->head = NULL; | |
305 | ||
306 | /* | |
307 | * We don't expect the list to be empty, that will only happen if we | |
308 | * race with the completion of the linked work. | |
309 | */ | |
310 | if (prev) { | |
311 | io_remove_next_linked(prev); | |
312 | if (!req_ref_inc_not_zero(prev)) | |
313 | prev = NULL; | |
314 | } | |
315 | list_del(&timeout->list); | |
316 | timeout->prev = prev; | |
317 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
318 | ||
319 | req->io_task_work.func = io_req_task_link_timeout; | |
320 | io_req_task_work_add(req); | |
321 | return HRTIMER_NORESTART; | |
322 | } | |
323 | ||
324 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) | |
325 | { | |
326 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
327 | case IORING_TIMEOUT_BOOTTIME: | |
328 | return CLOCK_BOOTTIME; | |
329 | case IORING_TIMEOUT_REALTIME: | |
330 | return CLOCK_REALTIME; | |
331 | default: | |
332 | /* can't happen, vetted at prep time */ | |
333 | WARN_ON_ONCE(1); | |
334 | fallthrough; | |
335 | case 0: | |
336 | return CLOCK_MONOTONIC; | |
337 | } | |
338 | } | |
339 | ||
340 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, | |
341 | struct timespec64 *ts, enum hrtimer_mode mode) | |
342 | __must_hold(&ctx->timeout_lock) | |
343 | { | |
344 | struct io_timeout_data *io; | |
345 | struct io_timeout *timeout; | |
346 | struct io_kiocb *req = NULL; | |
347 | ||
348 | list_for_each_entry(timeout, &ctx->ltimeout_list, list) { | |
349 | struct io_kiocb *tmp = cmd_to_io_kiocb(timeout); | |
350 | ||
351 | if (user_data == tmp->cqe.user_data) { | |
352 | req = tmp; | |
353 | break; | |
354 | } | |
355 | } | |
356 | if (!req) | |
357 | return -ENOENT; | |
358 | ||
359 | io = req->async_data; | |
360 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
361 | return -EALREADY; | |
362 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
363 | io->timer.function = io_link_timeout_fn; | |
364 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, | |
369 | struct timespec64 *ts, enum hrtimer_mode mode) | |
370 | __must_hold(&ctx->timeout_lock) | |
371 | { | |
372 | struct io_cancel_data cd = { .data = user_data, }; | |
373 | struct io_kiocb *req = io_timeout_extract(ctx, &cd); | |
f2ccb5ae | 374 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
375 | struct io_timeout_data *data; |
376 | ||
377 | if (IS_ERR(req)) | |
378 | return PTR_ERR(req); | |
379 | ||
380 | timeout->off = 0; /* noseq */ | |
381 | data = req->async_data; | |
382 | list_add_tail(&timeout->list, &ctx->timeout_list); | |
383 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); | |
384 | data->timer.function = io_timeout_fn; | |
385 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | int io_timeout_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
390 | { | |
f2ccb5ae | 391 | struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem); |
59915143 JA |
392 | |
393 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) | |
394 | return -EINVAL; | |
395 | if (sqe->buf_index || sqe->len || sqe->splice_fd_in) | |
396 | return -EINVAL; | |
397 | ||
398 | tr->ltimeout = false; | |
399 | tr->addr = READ_ONCE(sqe->addr); | |
400 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
401 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { | |
402 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
403 | return -EINVAL; | |
404 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
405 | tr->ltimeout = true; | |
406 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
407 | return -EINVAL; | |
408 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
409 | return -EFAULT; | |
410 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) | |
411 | return -EINVAL; | |
412 | } else if (tr->flags) { | |
413 | /* timeout removal doesn't support flags */ | |
414 | return -EINVAL; | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) | |
421 | { | |
422 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
423 | : HRTIMER_MODE_REL; | |
424 | } | |
425 | ||
426 | /* | |
427 | * Remove or update an existing timeout command | |
428 | */ | |
429 | int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) | |
430 | { | |
f2ccb5ae | 431 | struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem); |
59915143 JA |
432 | struct io_ring_ctx *ctx = req->ctx; |
433 | int ret; | |
434 | ||
435 | if (!(tr->flags & IORING_TIMEOUT_UPDATE)) { | |
436 | struct io_cancel_data cd = { .data = tr->addr, }; | |
437 | ||
438 | spin_lock(&ctx->completion_lock); | |
439 | ret = io_timeout_cancel(ctx, &cd); | |
440 | spin_unlock(&ctx->completion_lock); | |
441 | } else { | |
442 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); | |
443 | ||
444 | spin_lock_irq(&ctx->timeout_lock); | |
445 | if (tr->ltimeout) | |
446 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
447 | else | |
448 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
449 | spin_unlock_irq(&ctx->timeout_lock); | |
450 | } | |
451 | ||
452 | if (ret < 0) | |
453 | req_set_fail(req); | |
454 | io_req_set_res(req, ret, 0); | |
455 | return IOU_OK; | |
456 | } | |
457 | ||
458 | static int __io_timeout_prep(struct io_kiocb *req, | |
459 | const struct io_uring_sqe *sqe, | |
460 | bool is_timeout_link) | |
461 | { | |
f2ccb5ae | 462 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
463 | struct io_timeout_data *data; |
464 | unsigned flags; | |
465 | u32 off = READ_ONCE(sqe->off); | |
466 | ||
467 | if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in) | |
468 | return -EINVAL; | |
469 | if (off && is_timeout_link) | |
470 | return -EINVAL; | |
471 | flags = READ_ONCE(sqe->timeout_flags); | |
472 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | | |
473 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
474 | return -EINVAL; | |
475 | /* more than one clock specified is invalid, obviously */ | |
476 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
477 | return -EINVAL; | |
478 | ||
479 | INIT_LIST_HEAD(&timeout->list); | |
480 | timeout->off = off; | |
481 | if (unlikely(off && !req->ctx->off_timeout_used)) | |
482 | req->ctx->off_timeout_used = true; | |
483 | ||
484 | if (WARN_ON_ONCE(req_has_async_data(req))) | |
485 | return -EFAULT; | |
486 | if (io_alloc_async_data(req)) | |
487 | return -ENOMEM; | |
488 | ||
489 | data = req->async_data; | |
490 | data->req = req; | |
491 | data->flags = flags; | |
492 | ||
493 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
494 | return -EFAULT; | |
495 | ||
496 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) | |
497 | return -EINVAL; | |
498 | ||
499 | INIT_LIST_HEAD(&timeout->list); | |
500 | data->mode = io_translate_timeout_mode(flags); | |
501 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); | |
502 | ||
503 | if (is_timeout_link) { | |
504 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
505 | ||
506 | if (!link->head) | |
507 | return -EINVAL; | |
508 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
509 | return -EINVAL; | |
510 | timeout->head = link->last; | |
511 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
512 | } | |
513 | return 0; | |
514 | } | |
515 | ||
516 | int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
517 | { | |
518 | return __io_timeout_prep(req, sqe, false); | |
519 | } | |
520 | ||
521 | int io_link_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
522 | { | |
523 | return __io_timeout_prep(req, sqe, true); | |
524 | } | |
525 | ||
526 | int io_timeout(struct io_kiocb *req, unsigned int issue_flags) | |
527 | { | |
f2ccb5ae | 528 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
529 | struct io_ring_ctx *ctx = req->ctx; |
530 | struct io_timeout_data *data = req->async_data; | |
531 | struct list_head *entry; | |
532 | u32 tail, off = timeout->off; | |
533 | ||
534 | spin_lock_irq(&ctx->timeout_lock); | |
535 | ||
536 | /* | |
537 | * sqe->off holds how many events that need to occur for this | |
538 | * timeout event to be satisfied. If it isn't set, then this is | |
539 | * a pure timeout request, sequence isn't used. | |
540 | */ | |
541 | if (io_is_timeout_noseq(req)) { | |
542 | entry = ctx->timeout_list.prev; | |
543 | goto add; | |
544 | } | |
545 | ||
546 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); | |
547 | timeout->target_seq = tail + off; | |
548 | ||
549 | /* Update the last seq here in case io_flush_timeouts() hasn't. | |
550 | * This is safe because ->completion_lock is held, and submissions | |
551 | * and completions are never mixed in the same ->completion_lock section. | |
552 | */ | |
553 | ctx->cq_last_tm_flush = tail; | |
554 | ||
555 | /* | |
556 | * Insertion sort, ensuring the first entry in the list is always | |
557 | * the one we need first. | |
558 | */ | |
559 | list_for_each_prev(entry, &ctx->timeout_list) { | |
560 | struct io_timeout *nextt = list_entry(entry, struct io_timeout, list); | |
561 | struct io_kiocb *nxt = cmd_to_io_kiocb(nextt); | |
562 | ||
563 | if (io_is_timeout_noseq(nxt)) | |
564 | continue; | |
565 | /* nxt.seq is behind @tail, otherwise would've been completed */ | |
566 | if (off >= nextt->target_seq - tail) | |
567 | break; | |
568 | } | |
569 | add: | |
570 | list_add(&timeout->list, entry); | |
571 | data->timer.function = io_timeout_fn; | |
572 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
573 | spin_unlock_irq(&ctx->timeout_lock); | |
574 | return IOU_ISSUE_SKIP_COMPLETE; | |
575 | } | |
576 | ||
577 | void io_queue_linked_timeout(struct io_kiocb *req) | |
578 | { | |
f2ccb5ae | 579 | struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); |
59915143 JA |
580 | struct io_ring_ctx *ctx = req->ctx; |
581 | ||
582 | spin_lock_irq(&ctx->timeout_lock); | |
583 | /* | |
584 | * If the back reference is NULL, then our linked request finished | |
585 | * before we got a chance to setup the timer | |
586 | */ | |
587 | if (timeout->head) { | |
588 | struct io_timeout_data *data = req->async_data; | |
589 | ||
590 | data->timer.function = io_link_timeout_fn; | |
591 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
592 | data->mode); | |
593 | list_add_tail(&timeout->list, &ctx->ltimeout_list); | |
594 | } | |
595 | spin_unlock_irq(&ctx->timeout_lock); | |
596 | /* drop submission reference */ | |
597 | io_put_req(req); | |
598 | } | |
599 | ||
600 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, | |
601 | bool cancel_all) | |
602 | __must_hold(&req->ctx->timeout_lock) | |
603 | { | |
604 | struct io_kiocb *req; | |
605 | ||
606 | if (task && head->task != task) | |
607 | return false; | |
608 | if (cancel_all) | |
609 | return true; | |
610 | ||
611 | io_for_each_link(req, head) { | |
612 | if (req->flags & REQ_F_INFLIGHT) | |
613 | return true; | |
614 | } | |
615 | return false; | |
616 | } | |
617 | ||
618 | /* Returns true if we found and killed one or more timeouts */ | |
619 | __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
620 | bool cancel_all) | |
621 | { | |
622 | struct io_timeout *timeout, *tmp; | |
623 | int canceled = 0; | |
624 | ||
6971253f PB |
625 | /* |
626 | * completion_lock is needed for io_match_task(). Take it before | |
627 | * timeout_lockfirst to keep locking ordering. | |
628 | */ | |
629 | spin_lock(&ctx->completion_lock); | |
59915143 JA |
630 | spin_lock_irq(&ctx->timeout_lock); |
631 | list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) { | |
632 | struct io_kiocb *req = cmd_to_io_kiocb(timeout); | |
633 | ||
ba3cdb6f PB |
634 | if (io_match_task(req, tsk, cancel_all) && |
635 | io_kill_timeout(req, -ECANCELED)) | |
59915143 | 636 | canceled++; |
59915143 JA |
637 | } |
638 | spin_unlock_irq(&ctx->timeout_lock); | |
6971253f | 639 | spin_unlock(&ctx->completion_lock); |
59915143 JA |
640 | return canceled != 0; |
641 | } |