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 11#include "io_uring.h" 12#include "refs.h" 13#include "cancel.h" 14#include "timeout.h" 15 16struct io_timeout { 17 struct file *file; 18 u32 off; 19 u32 target_seq; 20 u32 repeats; 21 struct list_head list; 22 /* head of the link, used by linked timeouts only */ 23 struct io_kiocb *head; 24 /* for linked completions */ 25 struct io_kiocb *prev; 26}; 27 28struct io_timeout_rem { 29 struct file *file; 30 u64 addr; 31 32 /* timeout update */ 33 struct timespec64 ts; 34 u32 flags; 35 bool ltimeout; 36}; 37 38static inline bool io_is_timeout_noseq(struct io_kiocb *req) 39{ 40 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 41 struct io_timeout_data *data = req->async_data; 42 43 return !timeout->off || data->flags & IORING_TIMEOUT_MULTISHOT; 44} 45 46static inline void io_put_req(struct io_kiocb *req) 47{ 48 if (req_ref_put_and_test(req)) { 49 io_queue_next(req); 50 io_free_req(req); 51 } 52} 53 54static inline bool io_timeout_finish(struct io_timeout *timeout, 55 struct io_timeout_data *data) 56{ 57 if (!(data->flags & IORING_TIMEOUT_MULTISHOT)) 58 return true; 59 60 if (!timeout->off || (timeout->repeats && --timeout->repeats)) 61 return false; 62 63 return true; 64} 65 66static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer); 67 68static void io_timeout_complete(struct io_kiocb *req, struct io_tw_state *ts) 69{ 70 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 71 struct io_timeout_data *data = req->async_data; 72 struct io_ring_ctx *ctx = req->ctx; 73 74 if (!io_timeout_finish(timeout, data)) { 75 if (io_req_post_cqe(req, -ETIME, IORING_CQE_F_MORE)) { 76 /* re-arm timer */ 77 spin_lock_irq(&ctx->timeout_lock); 78 list_add(&timeout->list, ctx->timeout_list.prev); 79 data->timer.function = io_timeout_fn; 80 hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); 81 spin_unlock_irq(&ctx->timeout_lock); 82 return; 83 } 84 } 85 86 io_req_task_complete(req, ts); 87} 88 89static bool io_kill_timeout(struct io_kiocb *req, int status) 90 __must_hold(&req->ctx->timeout_lock) 91{ 92 struct io_timeout_data *io = req->async_data; 93 94 if (hrtimer_try_to_cancel(&io->timer) != -1) { 95 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 96 97 if (status) 98 req_set_fail(req); 99 atomic_set(&req->ctx->cq_timeouts, 100 atomic_read(&req->ctx->cq_timeouts) + 1); 101 list_del_init(&timeout->list); 102 io_req_queue_tw_complete(req, status); 103 return true; 104 } 105 return false; 106} 107 108__cold void io_flush_timeouts(struct io_ring_ctx *ctx) 109{ 110 u32 seq; 111 struct io_timeout *timeout, *tmp; 112 113 spin_lock_irq(&ctx->timeout_lock); 114 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); 115 116 list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) { 117 struct io_kiocb *req = cmd_to_io_kiocb(timeout); 118 u32 events_needed, events_got; 119 120 if (io_is_timeout_noseq(req)) 121 break; 122 123 /* 124 * Since seq can easily wrap around over time, subtract 125 * the last seq at which timeouts were flushed before comparing. 126 * Assuming not more than 2^31-1 events have happened since, 127 * these subtractions won't have wrapped, so we can check if 128 * target is in [last_seq, current_seq] by comparing the two. 129 */ 130 events_needed = timeout->target_seq - ctx->cq_last_tm_flush; 131 events_got = seq - ctx->cq_last_tm_flush; 132 if (events_got < events_needed) 133 break; 134 135 io_kill_timeout(req, 0); 136 } 137 ctx->cq_last_tm_flush = seq; 138 spin_unlock_irq(&ctx->timeout_lock); 139} 140 141static void io_req_tw_fail_links(struct io_kiocb *link, struct io_tw_state *ts) 142{ 143 io_tw_lock(link->ctx, ts); 144 while (link) { 145 struct io_kiocb *nxt = link->link; 146 long res = -ECANCELED; 147 148 if (link->flags & REQ_F_FAIL) 149 res = link->cqe.res; 150 link->link = NULL; 151 io_req_set_res(link, res, 0); 152 io_req_task_complete(link, ts); 153 link = nxt; 154 } 155} 156 157static void io_fail_links(struct io_kiocb *req) 158 __must_hold(&req->ctx->completion_lock) 159{ 160 struct io_kiocb *link = req->link; 161 bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; 162 163 if (!link) 164 return; 165 166 while (link) { 167 if (ignore_cqes) 168 link->flags |= REQ_F_CQE_SKIP; 169 else 170 link->flags &= ~REQ_F_CQE_SKIP; 171 trace_io_uring_fail_link(req, link); 172 link = link->link; 173 } 174 175 link = req->link; 176 link->io_task_work.func = io_req_tw_fail_links; 177 io_req_task_work_add(link); 178 req->link = NULL; 179} 180 181static inline void io_remove_next_linked(struct io_kiocb *req) 182{ 183 struct io_kiocb *nxt = req->link; 184 185 req->link = nxt->link; 186 nxt->link = NULL; 187} 188 189void io_disarm_next(struct io_kiocb *req) 190 __must_hold(&req->ctx->completion_lock) 191{ 192 struct io_kiocb *link = NULL; 193 194 if (req->flags & REQ_F_ARM_LTIMEOUT) { 195 link = req->link; 196 req->flags &= ~REQ_F_ARM_LTIMEOUT; 197 if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { 198 io_remove_next_linked(req); 199 io_req_queue_tw_complete(link, -ECANCELED); 200 } 201 } else if (req->flags & REQ_F_LINK_TIMEOUT) { 202 struct io_ring_ctx *ctx = req->ctx; 203 204 spin_lock_irq(&ctx->timeout_lock); 205 link = io_disarm_linked_timeout(req); 206 spin_unlock_irq(&ctx->timeout_lock); 207 if (link) 208 io_req_queue_tw_complete(link, -ECANCELED); 209 } 210 if (unlikely((req->flags & REQ_F_FAIL) && 211 !(req->flags & REQ_F_HARDLINK))) 212 io_fail_links(req); 213} 214 215struct io_kiocb *__io_disarm_linked_timeout(struct io_kiocb *req, 216 struct io_kiocb *link) 217 __must_hold(&req->ctx->completion_lock) 218 __must_hold(&req->ctx->timeout_lock) 219{ 220 struct io_timeout_data *io = link->async_data; 221 struct io_timeout *timeout = io_kiocb_to_cmd(link, struct io_timeout); 222 223 io_remove_next_linked(req); 224 timeout->head = NULL; 225 if (hrtimer_try_to_cancel(&io->timer) != -1) { 226 list_del(&timeout->list); 227 return link; 228 } 229 230 return NULL; 231} 232 233static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) 234{ 235 struct io_timeout_data *data = container_of(timer, 236 struct io_timeout_data, timer); 237 struct io_kiocb *req = data->req; 238 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 239 struct io_ring_ctx *ctx = req->ctx; 240 unsigned long flags; 241 242 spin_lock_irqsave(&ctx->timeout_lock, flags); 243 list_del_init(&timeout->list); 244 atomic_set(&req->ctx->cq_timeouts, 245 atomic_read(&req->ctx->cq_timeouts) + 1); 246 spin_unlock_irqrestore(&ctx->timeout_lock, flags); 247 248 if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) 249 req_set_fail(req); 250 251 io_req_set_res(req, -ETIME, 0); 252 req->io_task_work.func = io_timeout_complete; 253 io_req_task_work_add(req); 254 return HRTIMER_NORESTART; 255} 256 257static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, 258 struct io_cancel_data *cd) 259 __must_hold(&ctx->timeout_lock) 260{ 261 struct io_timeout *timeout; 262 struct io_timeout_data *io; 263 struct io_kiocb *req = NULL; 264 265 list_for_each_entry(timeout, &ctx->timeout_list, list) { 266 struct io_kiocb *tmp = cmd_to_io_kiocb(timeout); 267 268 if (io_cancel_req_match(tmp, cd)) { 269 req = tmp; 270 break; 271 } 272 } 273 if (!req) 274 return ERR_PTR(-ENOENT); 275 276 io = req->async_data; 277 if (hrtimer_try_to_cancel(&io->timer) == -1) 278 return ERR_PTR(-EALREADY); 279 timeout = io_kiocb_to_cmd(req, struct io_timeout); 280 list_del_init(&timeout->list); 281 return req; 282} 283 284int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) 285 __must_hold(&ctx->completion_lock) 286{ 287 struct io_kiocb *req; 288 289 spin_lock_irq(&ctx->timeout_lock); 290 req = io_timeout_extract(ctx, cd); 291 spin_unlock_irq(&ctx->timeout_lock); 292 293 if (IS_ERR(req)) 294 return PTR_ERR(req); 295 io_req_task_queue_fail(req, -ECANCELED); 296 return 0; 297} 298 299static void io_req_task_link_timeout(struct io_kiocb *req, struct io_tw_state *ts) 300{ 301 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 302 struct io_kiocb *prev = timeout->prev; 303 int ret = -ENOENT; 304 305 if (prev) { 306 if (!(req->task->flags & PF_EXITING)) { 307 struct io_cancel_data cd = { 308 .ctx = req->ctx, 309 .data = prev->cqe.user_data, 310 }; 311 312 ret = io_try_cancel(req->task->io_uring, &cd, 0); 313 } 314 io_req_set_res(req, ret ?: -ETIME, 0); 315 io_req_task_complete(req, ts); 316 io_put_req(prev); 317 } else { 318 io_req_set_res(req, -ETIME, 0); 319 io_req_task_complete(req, ts); 320 } 321} 322 323static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) 324{ 325 struct io_timeout_data *data = container_of(timer, 326 struct io_timeout_data, timer); 327 struct io_kiocb *prev, *req = data->req; 328 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 329 struct io_ring_ctx *ctx = req->ctx; 330 unsigned long flags; 331 332 spin_lock_irqsave(&ctx->timeout_lock, flags); 333 prev = timeout->head; 334 timeout->head = NULL; 335 336 /* 337 * We don't expect the list to be empty, that will only happen if we 338 * race with the completion of the linked work. 339 */ 340 if (prev) { 341 io_remove_next_linked(prev); 342 if (!req_ref_inc_not_zero(prev)) 343 prev = NULL; 344 } 345 list_del(&timeout->list); 346 timeout->prev = prev; 347 spin_unlock_irqrestore(&ctx->timeout_lock, flags); 348 349 req->io_task_work.func = io_req_task_link_timeout; 350 io_req_task_work_add(req); 351 return HRTIMER_NORESTART; 352} 353 354static clockid_t io_timeout_get_clock(struct io_timeout_data *data) 355{ 356 switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { 357 case IORING_TIMEOUT_BOOTTIME: 358 return CLOCK_BOOTTIME; 359 case IORING_TIMEOUT_REALTIME: 360 return CLOCK_REALTIME; 361 default: 362 /* can't happen, vetted at prep time */ 363 WARN_ON_ONCE(1); 364 fallthrough; 365 case 0: 366 return CLOCK_MONOTONIC; 367 } 368} 369 370static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, 371 struct timespec64 *ts, enum hrtimer_mode mode) 372 __must_hold(&ctx->timeout_lock) 373{ 374 struct io_timeout_data *io; 375 struct io_timeout *timeout; 376 struct io_kiocb *req = NULL; 377 378 list_for_each_entry(timeout, &ctx->ltimeout_list, list) { 379 struct io_kiocb *tmp = cmd_to_io_kiocb(timeout); 380 381 if (user_data == tmp->cqe.user_data) { 382 req = tmp; 383 break; 384 } 385 } 386 if (!req) 387 return -ENOENT; 388 389 io = req->async_data; 390 if (hrtimer_try_to_cancel(&io->timer) == -1) 391 return -EALREADY; 392 hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); 393 io->timer.function = io_link_timeout_fn; 394 hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); 395 return 0; 396} 397 398static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, 399 struct timespec64 *ts, enum hrtimer_mode mode) 400 __must_hold(&ctx->timeout_lock) 401{ 402 struct io_cancel_data cd = { .ctx = ctx, .data = user_data, }; 403 struct io_kiocb *req = io_timeout_extract(ctx, &cd); 404 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 405 struct io_timeout_data *data; 406 407 if (IS_ERR(req)) 408 return PTR_ERR(req); 409 410 timeout->off = 0; /* noseq */ 411 data = req->async_data; 412 list_add_tail(&timeout->list, &ctx->timeout_list); 413 hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); 414 data->timer.function = io_timeout_fn; 415 hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); 416 return 0; 417} 418 419int io_timeout_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 420{ 421 struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem); 422 423 if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) 424 return -EINVAL; 425 if (sqe->buf_index || sqe->len || sqe->splice_fd_in) 426 return -EINVAL; 427 428 tr->ltimeout = false; 429 tr->addr = READ_ONCE(sqe->addr); 430 tr->flags = READ_ONCE(sqe->timeout_flags); 431 if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { 432 if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) 433 return -EINVAL; 434 if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) 435 tr->ltimeout = true; 436 if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) 437 return -EINVAL; 438 if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) 439 return -EFAULT; 440 if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) 441 return -EINVAL; 442 } else if (tr->flags) { 443 /* timeout removal doesn't support flags */ 444 return -EINVAL; 445 } 446 447 return 0; 448} 449 450static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) 451{ 452 return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS 453 : HRTIMER_MODE_REL; 454} 455 456/* 457 * Remove or update an existing timeout command 458 */ 459int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) 460{ 461 struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem); 462 struct io_ring_ctx *ctx = req->ctx; 463 int ret; 464 465 if (!(tr->flags & IORING_TIMEOUT_UPDATE)) { 466 struct io_cancel_data cd = { .ctx = ctx, .data = tr->addr, }; 467 468 spin_lock(&ctx->completion_lock); 469 ret = io_timeout_cancel(ctx, &cd); 470 spin_unlock(&ctx->completion_lock); 471 } else { 472 enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); 473 474 spin_lock_irq(&ctx->timeout_lock); 475 if (tr->ltimeout) 476 ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); 477 else 478 ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); 479 spin_unlock_irq(&ctx->timeout_lock); 480 } 481 482 if (ret < 0) 483 req_set_fail(req); 484 io_req_set_res(req, ret, 0); 485 return IOU_OK; 486} 487 488static int __io_timeout_prep(struct io_kiocb *req, 489 const struct io_uring_sqe *sqe, 490 bool is_timeout_link) 491{ 492 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 493 struct io_timeout_data *data; 494 unsigned flags; 495 u32 off = READ_ONCE(sqe->off); 496 497 if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in) 498 return -EINVAL; 499 if (off && is_timeout_link) 500 return -EINVAL; 501 flags = READ_ONCE(sqe->timeout_flags); 502 if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | 503 IORING_TIMEOUT_ETIME_SUCCESS | 504 IORING_TIMEOUT_MULTISHOT)) 505 return -EINVAL; 506 /* more than one clock specified is invalid, obviously */ 507 if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) 508 return -EINVAL; 509 /* multishot requests only make sense with rel values */ 510 if (!(~flags & (IORING_TIMEOUT_MULTISHOT | IORING_TIMEOUT_ABS))) 511 return -EINVAL; 512 513 INIT_LIST_HEAD(&timeout->list); 514 timeout->off = off; 515 if (unlikely(off && !req->ctx->off_timeout_used)) 516 req->ctx->off_timeout_used = true; 517 /* 518 * for multishot reqs w/ fixed nr of repeats, repeats tracks the 519 * remaining nr 520 */ 521 timeout->repeats = 0; 522 if ((flags & IORING_TIMEOUT_MULTISHOT) && off > 0) 523 timeout->repeats = off; 524 525 if (WARN_ON_ONCE(req_has_async_data(req))) 526 return -EFAULT; 527 if (io_alloc_async_data(req)) 528 return -ENOMEM; 529 530 data = req->async_data; 531 data->req = req; 532 data->flags = flags; 533 534 if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) 535 return -EFAULT; 536 537 if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) 538 return -EINVAL; 539 540 data->mode = io_translate_timeout_mode(flags); 541 hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); 542 543 if (is_timeout_link) { 544 struct io_submit_link *link = &req->ctx->submit_state.link; 545 546 if (!link->head) 547 return -EINVAL; 548 if (link->last->opcode == IORING_OP_LINK_TIMEOUT) 549 return -EINVAL; 550 timeout->head = link->last; 551 link->last->flags |= REQ_F_ARM_LTIMEOUT; 552 } 553 return 0; 554} 555 556int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 557{ 558 return __io_timeout_prep(req, sqe, false); 559} 560 561int io_link_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 562{ 563 return __io_timeout_prep(req, sqe, true); 564} 565 566int io_timeout(struct io_kiocb *req, unsigned int issue_flags) 567{ 568 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 569 struct io_ring_ctx *ctx = req->ctx; 570 struct io_timeout_data *data = req->async_data; 571 struct list_head *entry; 572 u32 tail, off = timeout->off; 573 574 spin_lock_irq(&ctx->timeout_lock); 575 576 /* 577 * sqe->off holds how many events that need to occur for this 578 * timeout event to be satisfied. If it isn't set, then this is 579 * a pure timeout request, sequence isn't used. 580 */ 581 if (io_is_timeout_noseq(req)) { 582 entry = ctx->timeout_list.prev; 583 goto add; 584 } 585 586 tail = data_race(ctx->cached_cq_tail) - atomic_read(&ctx->cq_timeouts); 587 timeout->target_seq = tail + off; 588 589 /* Update the last seq here in case io_flush_timeouts() hasn't. 590 * This is safe because ->completion_lock is held, and submissions 591 * and completions are never mixed in the same ->completion_lock section. 592 */ 593 ctx->cq_last_tm_flush = tail; 594 595 /* 596 * Insertion sort, ensuring the first entry in the list is always 597 * the one we need first. 598 */ 599 list_for_each_prev(entry, &ctx->timeout_list) { 600 struct io_timeout *nextt = list_entry(entry, struct io_timeout, list); 601 struct io_kiocb *nxt = cmd_to_io_kiocb(nextt); 602 603 if (io_is_timeout_noseq(nxt)) 604 continue; 605 /* nxt.seq is behind @tail, otherwise would've been completed */ 606 if (off >= nextt->target_seq - tail) 607 break; 608 } 609add: 610 list_add(&timeout->list, entry); 611 data->timer.function = io_timeout_fn; 612 hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); 613 spin_unlock_irq(&ctx->timeout_lock); 614 return IOU_ISSUE_SKIP_COMPLETE; 615} 616 617void io_queue_linked_timeout(struct io_kiocb *req) 618{ 619 struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout); 620 struct io_ring_ctx *ctx = req->ctx; 621 622 spin_lock_irq(&ctx->timeout_lock); 623 /* 624 * If the back reference is NULL, then our linked request finished 625 * before we got a chance to setup the timer 626 */ 627 if (timeout->head) { 628 struct io_timeout_data *data = req->async_data; 629 630 data->timer.function = io_link_timeout_fn; 631 hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), 632 data->mode); 633 list_add_tail(&timeout->list, &ctx->ltimeout_list); 634 } 635 spin_unlock_irq(&ctx->timeout_lock); 636 /* drop submission reference */ 637 io_put_req(req); 638} 639 640static bool io_match_task(struct io_kiocb *head, struct task_struct *task, 641 bool cancel_all) 642 __must_hold(&req->ctx->timeout_lock) 643{ 644 struct io_kiocb *req; 645 646 if (task && head->task != task) 647 return false; 648 if (cancel_all) 649 return true; 650 651 io_for_each_link(req, head) { 652 if (req->flags & REQ_F_INFLIGHT) 653 return true; 654 } 655 return false; 656} 657 658/* Returns true if we found and killed one or more timeouts */ 659__cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, 660 bool cancel_all) 661{ 662 struct io_timeout *timeout, *tmp; 663 int canceled = 0; 664 665 /* 666 * completion_lock is needed for io_match_task(). Take it before 667 * timeout_lockfirst to keep locking ordering. 668 */ 669 spin_lock(&ctx->completion_lock); 670 spin_lock_irq(&ctx->timeout_lock); 671 list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) { 672 struct io_kiocb *req = cmd_to_io_kiocb(timeout); 673 674 if (io_match_task(req, tsk, cancel_all) && 675 io_kill_timeout(req, -ECANCELED)) 676 canceled++; 677 } 678 spin_unlock_irq(&ctx->timeout_lock); 679 spin_unlock(&ctx->completion_lock); 680 return canceled != 0; 681} 682