io_uring/timeout.c

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