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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Pavel Begunkov](/assets/img/avatar_default.png)
Now all callers of io_aux_cqe() set allow_overflow to false, remove the parameter and not allow overflowing auxilary multishot cqes. When CQ is full the function callers and all multishot requests in general are expected to complete the request. That prevents indefinite in-background grows of the overflow list and let's the userspace to handle the backlog at its own pace. Resubmitting a request should also be faster than accounting a bunch of overflows, so it should be better for perf when it happens, but a well behaving userspace should be trying to avoid overflows in any case. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/bb20d14d708ea174721e58bb53786b0521e4dd6d.1691757663.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
686 lines
18 KiB
C
686 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/io_uring.h>
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#include <trace/events/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "refs.h"
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#include "cancel.h"
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#include "timeout.h"
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struct io_timeout {
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struct file *file;
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u32 off;
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u32 target_seq;
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u32 repeats;
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struct list_head list;
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/* head of the link, used by linked timeouts only */
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struct io_kiocb *head;
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/* for linked completions */
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struct io_kiocb *prev;
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};
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struct io_timeout_rem {
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struct file *file;
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u64 addr;
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/* timeout update */
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struct timespec64 ts;
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u32 flags;
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bool ltimeout;
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};
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static inline bool io_is_timeout_noseq(struct io_kiocb *req)
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{
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_timeout_data *data = req->async_data;
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return !timeout->off || data->flags & IORING_TIMEOUT_MULTISHOT;
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}
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static inline void io_put_req(struct io_kiocb *req)
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{
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if (req_ref_put_and_test(req)) {
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io_queue_next(req);
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io_free_req(req);
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}
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}
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static inline bool io_timeout_finish(struct io_timeout *timeout,
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struct io_timeout_data *data)
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{
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if (!(data->flags & IORING_TIMEOUT_MULTISHOT))
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return true;
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if (!timeout->off || (timeout->repeats && --timeout->repeats))
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return false;
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return true;
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}
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static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer);
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static void io_timeout_complete(struct io_kiocb *req, struct io_tw_state *ts)
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{
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_timeout_data *data = req->async_data;
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struct io_ring_ctx *ctx = req->ctx;
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if (!io_timeout_finish(timeout, data)) {
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bool filled;
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filled = io_fill_cqe_req_aux(req, ts->locked, -ETIME,
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IORING_CQE_F_MORE);
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if (filled) {
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/* re-arm timer */
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spin_lock_irq(&ctx->timeout_lock);
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list_add(&timeout->list, ctx->timeout_list.prev);
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data->timer.function = io_timeout_fn;
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hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode);
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spin_unlock_irq(&ctx->timeout_lock);
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return;
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}
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}
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io_req_task_complete(req, ts);
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}
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static bool io_kill_timeout(struct io_kiocb *req, int status)
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__must_hold(&req->ctx->timeout_lock)
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{
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struct io_timeout_data *io = req->async_data;
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if (hrtimer_try_to_cancel(&io->timer) != -1) {
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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if (status)
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req_set_fail(req);
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atomic_set(&req->ctx->cq_timeouts,
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atomic_read(&req->ctx->cq_timeouts) + 1);
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list_del_init(&timeout->list);
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io_req_queue_tw_complete(req, status);
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return true;
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}
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return false;
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}
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__cold void io_flush_timeouts(struct io_ring_ctx *ctx)
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{
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u32 seq;
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struct io_timeout *timeout, *tmp;
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spin_lock_irq(&ctx->timeout_lock);
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seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
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list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) {
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struct io_kiocb *req = cmd_to_io_kiocb(timeout);
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u32 events_needed, events_got;
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if (io_is_timeout_noseq(req))
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break;
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/*
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* Since seq can easily wrap around over time, subtract
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* the last seq at which timeouts were flushed before comparing.
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* Assuming not more than 2^31-1 events have happened since,
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* these subtractions won't have wrapped, so we can check if
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* target is in [last_seq, current_seq] by comparing the two.
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*/
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events_needed = timeout->target_seq - ctx->cq_last_tm_flush;
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events_got = seq - ctx->cq_last_tm_flush;
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if (events_got < events_needed)
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break;
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io_kill_timeout(req, 0);
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}
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ctx->cq_last_tm_flush = seq;
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spin_unlock_irq(&ctx->timeout_lock);
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}
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static void io_req_tw_fail_links(struct io_kiocb *link, struct io_tw_state *ts)
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{
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io_tw_lock(link->ctx, ts);
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while (link) {
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struct io_kiocb *nxt = link->link;
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long res = -ECANCELED;
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if (link->flags & REQ_F_FAIL)
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res = link->cqe.res;
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link->link = NULL;
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io_req_set_res(link, res, 0);
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io_req_task_complete(link, ts);
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link = nxt;
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}
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}
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static void io_fail_links(struct io_kiocb *req)
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__must_hold(&req->ctx->completion_lock)
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{
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struct io_kiocb *link = req->link;
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bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES;
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if (!link)
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return;
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while (link) {
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if (ignore_cqes)
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link->flags |= REQ_F_CQE_SKIP;
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else
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link->flags &= ~REQ_F_CQE_SKIP;
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trace_io_uring_fail_link(req, link);
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link = link->link;
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}
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link = req->link;
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link->io_task_work.func = io_req_tw_fail_links;
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io_req_task_work_add(link);
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req->link = NULL;
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}
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static inline void io_remove_next_linked(struct io_kiocb *req)
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{
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struct io_kiocb *nxt = req->link;
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req->link = nxt->link;
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nxt->link = NULL;
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}
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void io_disarm_next(struct io_kiocb *req)
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__must_hold(&req->ctx->completion_lock)
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{
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struct io_kiocb *link = NULL;
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if (req->flags & REQ_F_ARM_LTIMEOUT) {
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link = req->link;
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req->flags &= ~REQ_F_ARM_LTIMEOUT;
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if (link && link->opcode == IORING_OP_LINK_TIMEOUT) {
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io_remove_next_linked(req);
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io_req_queue_tw_complete(link, -ECANCELED);
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}
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} else if (req->flags & REQ_F_LINK_TIMEOUT) {
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struct io_ring_ctx *ctx = req->ctx;
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spin_lock_irq(&ctx->timeout_lock);
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link = io_disarm_linked_timeout(req);
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spin_unlock_irq(&ctx->timeout_lock);
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if (link)
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io_req_queue_tw_complete(link, -ECANCELED);
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}
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if (unlikely((req->flags & REQ_F_FAIL) &&
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!(req->flags & REQ_F_HARDLINK)))
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io_fail_links(req);
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}
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struct io_kiocb *__io_disarm_linked_timeout(struct io_kiocb *req,
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struct io_kiocb *link)
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__must_hold(&req->ctx->completion_lock)
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__must_hold(&req->ctx->timeout_lock)
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{
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struct io_timeout_data *io = link->async_data;
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struct io_timeout *timeout = io_kiocb_to_cmd(link, struct io_timeout);
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io_remove_next_linked(req);
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timeout->head = NULL;
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if (hrtimer_try_to_cancel(&io->timer) != -1) {
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list_del(&timeout->list);
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return link;
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}
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return NULL;
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}
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static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
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{
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struct io_timeout_data *data = container_of(timer,
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struct io_timeout_data, timer);
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struct io_kiocb *req = data->req;
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_ring_ctx *ctx = req->ctx;
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unsigned long flags;
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spin_lock_irqsave(&ctx->timeout_lock, flags);
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list_del_init(&timeout->list);
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atomic_set(&req->ctx->cq_timeouts,
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atomic_read(&req->ctx->cq_timeouts) + 1);
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spin_unlock_irqrestore(&ctx->timeout_lock, flags);
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if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS))
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req_set_fail(req);
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io_req_set_res(req, -ETIME, 0);
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req->io_task_work.func = io_timeout_complete;
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io_req_task_work_add(req);
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return HRTIMER_NORESTART;
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}
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static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx,
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struct io_cancel_data *cd)
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__must_hold(&ctx->timeout_lock)
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{
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struct io_timeout *timeout;
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struct io_timeout_data *io;
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struct io_kiocb *req = NULL;
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list_for_each_entry(timeout, &ctx->timeout_list, list) {
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struct io_kiocb *tmp = cmd_to_io_kiocb(timeout);
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if (io_cancel_req_match(tmp, cd)) {
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req = tmp;
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break;
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}
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}
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if (!req)
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return ERR_PTR(-ENOENT);
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io = req->async_data;
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if (hrtimer_try_to_cancel(&io->timer) == -1)
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return ERR_PTR(-EALREADY);
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timeout = io_kiocb_to_cmd(req, struct io_timeout);
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list_del_init(&timeout->list);
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return req;
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}
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int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
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__must_hold(&ctx->completion_lock)
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{
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struct io_kiocb *req;
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spin_lock_irq(&ctx->timeout_lock);
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req = io_timeout_extract(ctx, cd);
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spin_unlock_irq(&ctx->timeout_lock);
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if (IS_ERR(req))
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return PTR_ERR(req);
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io_req_task_queue_fail(req, -ECANCELED);
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return 0;
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}
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static void io_req_task_link_timeout(struct io_kiocb *req, struct io_tw_state *ts)
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{
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unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED;
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_kiocb *prev = timeout->prev;
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int ret = -ENOENT;
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if (prev) {
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if (!(req->task->flags & PF_EXITING)) {
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struct io_cancel_data cd = {
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.ctx = req->ctx,
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.data = prev->cqe.user_data,
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};
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ret = io_try_cancel(req->task->io_uring, &cd, issue_flags);
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}
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io_req_set_res(req, ret ?: -ETIME, 0);
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io_req_task_complete(req, ts);
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io_put_req(prev);
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} else {
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io_req_set_res(req, -ETIME, 0);
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io_req_task_complete(req, ts);
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}
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}
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static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
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{
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struct io_timeout_data *data = container_of(timer,
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struct io_timeout_data, timer);
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struct io_kiocb *prev, *req = data->req;
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_ring_ctx *ctx = req->ctx;
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unsigned long flags;
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spin_lock_irqsave(&ctx->timeout_lock, flags);
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prev = timeout->head;
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timeout->head = NULL;
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/*
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* We don't expect the list to be empty, that will only happen if we
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* race with the completion of the linked work.
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*/
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if (prev) {
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io_remove_next_linked(prev);
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if (!req_ref_inc_not_zero(prev))
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prev = NULL;
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}
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list_del(&timeout->list);
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timeout->prev = prev;
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spin_unlock_irqrestore(&ctx->timeout_lock, flags);
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req->io_task_work.func = io_req_task_link_timeout;
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io_req_task_work_add(req);
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return HRTIMER_NORESTART;
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}
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static clockid_t io_timeout_get_clock(struct io_timeout_data *data)
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{
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switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) {
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case IORING_TIMEOUT_BOOTTIME:
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return CLOCK_BOOTTIME;
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case IORING_TIMEOUT_REALTIME:
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return CLOCK_REALTIME;
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default:
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/* can't happen, vetted at prep time */
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WARN_ON_ONCE(1);
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fallthrough;
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case 0:
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return CLOCK_MONOTONIC;
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}
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}
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static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
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struct timespec64 *ts, enum hrtimer_mode mode)
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__must_hold(&ctx->timeout_lock)
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{
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struct io_timeout_data *io;
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struct io_timeout *timeout;
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struct io_kiocb *req = NULL;
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list_for_each_entry(timeout, &ctx->ltimeout_list, list) {
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struct io_kiocb *tmp = cmd_to_io_kiocb(timeout);
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if (user_data == tmp->cqe.user_data) {
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req = tmp;
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break;
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}
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}
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if (!req)
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return -ENOENT;
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io = req->async_data;
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if (hrtimer_try_to_cancel(&io->timer) == -1)
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return -EALREADY;
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hrtimer_init(&io->timer, io_timeout_get_clock(io), mode);
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io->timer.function = io_link_timeout_fn;
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hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode);
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return 0;
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}
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static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
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struct timespec64 *ts, enum hrtimer_mode mode)
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__must_hold(&ctx->timeout_lock)
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{
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struct io_cancel_data cd = { .ctx = ctx, .data = user_data, };
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struct io_kiocb *req = io_timeout_extract(ctx, &cd);
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struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
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struct io_timeout_data *data;
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if (IS_ERR(req))
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return PTR_ERR(req);
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timeout->off = 0; /* noseq */
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data = req->async_data;
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list_add_tail(&timeout->list, &ctx->timeout_list);
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hrtimer_init(&data->timer, io_timeout_get_clock(data), mode);
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data->timer.function = io_timeout_fn;
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hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode);
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return 0;
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}
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int io_timeout_remove_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem);
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if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
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return -EINVAL;
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if (sqe->buf_index || sqe->len || sqe->splice_fd_in)
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return -EINVAL;
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tr->ltimeout = false;
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tr->addr = READ_ONCE(sqe->addr);
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tr->flags = READ_ONCE(sqe->timeout_flags);
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if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) {
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if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
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return -EINVAL;
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if (tr->flags & IORING_LINK_TIMEOUT_UPDATE)
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tr->ltimeout = true;
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if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS))
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return -EINVAL;
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if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2)))
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return -EFAULT;
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if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0)
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return -EINVAL;
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} else if (tr->flags) {
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/* timeout removal doesn't support flags */
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return -EINVAL;
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}
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return 0;
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}
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static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags)
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{
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return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS
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: HRTIMER_MODE_REL;
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}
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/*
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* Remove or update an existing timeout command
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*/
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int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_timeout_rem *tr = io_kiocb_to_cmd(req, struct io_timeout_rem);
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struct io_ring_ctx *ctx = req->ctx;
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int ret;
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if (!(tr->flags & IORING_TIMEOUT_UPDATE)) {
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struct io_cancel_data cd = { .ctx = ctx, .data = tr->addr, };
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spin_lock(&ctx->completion_lock);
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ret = io_timeout_cancel(ctx, &cd);
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spin_unlock(&ctx->completion_lock);
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} else {
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enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags);
|
|
|
|
spin_lock_irq(&ctx->timeout_lock);
|
|
if (tr->ltimeout)
|
|
ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode);
|
|
else
|
|
ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode);
|
|
spin_unlock_irq(&ctx->timeout_lock);
|
|
}
|
|
|
|
if (ret < 0)
|
|
req_set_fail(req);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
static int __io_timeout_prep(struct io_kiocb *req,
|
|
const struct io_uring_sqe *sqe,
|
|
bool is_timeout_link)
|
|
{
|
|
struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
|
|
struct io_timeout_data *data;
|
|
unsigned flags;
|
|
u32 off = READ_ONCE(sqe->off);
|
|
|
|
if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in)
|
|
return -EINVAL;
|
|
if (off && is_timeout_link)
|
|
return -EINVAL;
|
|
flags = READ_ONCE(sqe->timeout_flags);
|
|
if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK |
|
|
IORING_TIMEOUT_ETIME_SUCCESS |
|
|
IORING_TIMEOUT_MULTISHOT))
|
|
return -EINVAL;
|
|
/* more than one clock specified is invalid, obviously */
|
|
if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
|
|
return -EINVAL;
|
|
/* multishot requests only make sense with rel values */
|
|
if (!(~flags & (IORING_TIMEOUT_MULTISHOT | IORING_TIMEOUT_ABS)))
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&timeout->list);
|
|
timeout->off = off;
|
|
if (unlikely(off && !req->ctx->off_timeout_used))
|
|
req->ctx->off_timeout_used = true;
|
|
/*
|
|
* for multishot reqs w/ fixed nr of repeats, repeats tracks the
|
|
* remaining nr
|
|
*/
|
|
timeout->repeats = 0;
|
|
if ((flags & IORING_TIMEOUT_MULTISHOT) && off > 0)
|
|
timeout->repeats = off;
|
|
|
|
if (WARN_ON_ONCE(req_has_async_data(req)))
|
|
return -EFAULT;
|
|
if (io_alloc_async_data(req))
|
|
return -ENOMEM;
|
|
|
|
data = req->async_data;
|
|
data->req = req;
|
|
data->flags = flags;
|
|
|
|
if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr)))
|
|
return -EFAULT;
|
|
|
|
if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0)
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&timeout->list);
|
|
data->mode = io_translate_timeout_mode(flags);
|
|
hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode);
|
|
|
|
if (is_timeout_link) {
|
|
struct io_submit_link *link = &req->ctx->submit_state.link;
|
|
|
|
if (!link->head)
|
|
return -EINVAL;
|
|
if (link->last->opcode == IORING_OP_LINK_TIMEOUT)
|
|
return -EINVAL;
|
|
timeout->head = link->last;
|
|
link->last->flags |= REQ_F_ARM_LTIMEOUT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
return __io_timeout_prep(req, sqe, false);
|
|
}
|
|
|
|
int io_link_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
return __io_timeout_prep(req, sqe, true);
|
|
}
|
|
|
|
int io_timeout(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
struct io_timeout_data *data = req->async_data;
|
|
struct list_head *entry;
|
|
u32 tail, off = timeout->off;
|
|
|
|
spin_lock_irq(&ctx->timeout_lock);
|
|
|
|
/*
|
|
* sqe->off holds how many events that need to occur for this
|
|
* timeout event to be satisfied. If it isn't set, then this is
|
|
* a pure timeout request, sequence isn't used.
|
|
*/
|
|
if (io_is_timeout_noseq(req)) {
|
|
entry = ctx->timeout_list.prev;
|
|
goto add;
|
|
}
|
|
|
|
tail = data_race(ctx->cached_cq_tail) - atomic_read(&ctx->cq_timeouts);
|
|
timeout->target_seq = tail + off;
|
|
|
|
/* Update the last seq here in case io_flush_timeouts() hasn't.
|
|
* This is safe because ->completion_lock is held, and submissions
|
|
* and completions are never mixed in the same ->completion_lock section.
|
|
*/
|
|
ctx->cq_last_tm_flush = tail;
|
|
|
|
/*
|
|
* Insertion sort, ensuring the first entry in the list is always
|
|
* the one we need first.
|
|
*/
|
|
list_for_each_prev(entry, &ctx->timeout_list) {
|
|
struct io_timeout *nextt = list_entry(entry, struct io_timeout, list);
|
|
struct io_kiocb *nxt = cmd_to_io_kiocb(nextt);
|
|
|
|
if (io_is_timeout_noseq(nxt))
|
|
continue;
|
|
/* nxt.seq is behind @tail, otherwise would've been completed */
|
|
if (off >= nextt->target_seq - tail)
|
|
break;
|
|
}
|
|
add:
|
|
list_add(&timeout->list, entry);
|
|
data->timer.function = io_timeout_fn;
|
|
hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode);
|
|
spin_unlock_irq(&ctx->timeout_lock);
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
}
|
|
|
|
void io_queue_linked_timeout(struct io_kiocb *req)
|
|
{
|
|
struct io_timeout *timeout = io_kiocb_to_cmd(req, struct io_timeout);
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
|
|
spin_lock_irq(&ctx->timeout_lock);
|
|
/*
|
|
* If the back reference is NULL, then our linked request finished
|
|
* before we got a chance to setup the timer
|
|
*/
|
|
if (timeout->head) {
|
|
struct io_timeout_data *data = req->async_data;
|
|
|
|
data->timer.function = io_link_timeout_fn;
|
|
hrtimer_start(&data->timer, timespec64_to_ktime(data->ts),
|
|
data->mode);
|
|
list_add_tail(&timeout->list, &ctx->ltimeout_list);
|
|
}
|
|
spin_unlock_irq(&ctx->timeout_lock);
|
|
/* drop submission reference */
|
|
io_put_req(req);
|
|
}
|
|
|
|
static bool io_match_task(struct io_kiocb *head, struct task_struct *task,
|
|
bool cancel_all)
|
|
__must_hold(&req->ctx->timeout_lock)
|
|
{
|
|
struct io_kiocb *req;
|
|
|
|
if (task && head->task != task)
|
|
return false;
|
|
if (cancel_all)
|
|
return true;
|
|
|
|
io_for_each_link(req, head) {
|
|
if (req->flags & REQ_F_INFLIGHT)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Returns true if we found and killed one or more timeouts */
|
|
__cold bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
|
|
bool cancel_all)
|
|
{
|
|
struct io_timeout *timeout, *tmp;
|
|
int canceled = 0;
|
|
|
|
/*
|
|
* completion_lock is needed for io_match_task(). Take it before
|
|
* timeout_lockfirst to keep locking ordering.
|
|
*/
|
|
spin_lock(&ctx->completion_lock);
|
|
spin_lock_irq(&ctx->timeout_lock);
|
|
list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) {
|
|
struct io_kiocb *req = cmd_to_io_kiocb(timeout);
|
|
|
|
if (io_match_task(req, tsk, cancel_all) &&
|
|
io_kill_timeout(req, -ECANCELED))
|
|
canceled++;
|
|
}
|
|
spin_unlock_irq(&ctx->timeout_lock);
|
|
spin_unlock(&ctx->completion_lock);
|
|
return canceled != 0;
|
|
}
|