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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Pavel Begunkov](/assets/img/avatar_default.png)
We removed conditional io_commit_cqring_flush() guarding against spurious eventfd and the io_disarm_next()'s return value is not used anymore, just void it. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/9a441c9a32a58bcc586076fa9a7d0dc33f1fb3cb.1662652536.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
637 lines
17 KiB
C
637 lines
17 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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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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return !timeout->off;
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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 bool io_kill_timeout(struct io_kiocb *req, int status)
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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 = 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_tw_post_queue(req, status, 0);
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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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__must_hold(&ctx->completion_lock)
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{
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u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
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struct io_timeout *timeout, *tmp;
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spin_lock_irq(&ctx->timeout_lock);
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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, bool *locked)
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{
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io_tw_lock(link->ctx, locked);
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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, locked);
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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_tw_post_queue(link, -ECANCELED, 0);
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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_tw_post_queue(link, -ECANCELED, 0);
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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_req_task_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 (!(cd->flags & IORING_ASYNC_CANCEL_ANY) &&
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cd->data != tmp->cqe.user_data)
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continue;
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if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) {
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if (cd->seq == tmp->work.cancel_seq)
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continue;
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tmp->work.cancel_seq = cd->seq;
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}
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req = tmp;
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break;
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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, bool *locked)
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{
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unsigned issue_flags = *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_complete_post(req);
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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_complete_post(req);
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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 = { .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 = { .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);
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spin_lock_irq(&ctx->timeout_lock);
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if (tr->ltimeout)
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ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode);
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else
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ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode);
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spin_unlock_irq(&ctx->timeout_lock);
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}
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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}
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static int __io_timeout_prep(struct io_kiocb *req,
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const struct io_uring_sqe *sqe,
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bool is_timeout_link)
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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;
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unsigned flags;
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u32 off = READ_ONCE(sqe->off);
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if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in)
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return -EINVAL;
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if (off && is_timeout_link)
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return -EINVAL;
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flags = READ_ONCE(sqe->timeout_flags);
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if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK |
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IORING_TIMEOUT_ETIME_SUCCESS))
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return -EINVAL;
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/* more than one clock specified is invalid, obviously */
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if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
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return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&timeout->list);
|
|
timeout->off = off;
|
|
if (unlikely(off && !req->ctx->off_timeout_used))
|
|
req->ctx->off_timeout_used = true;
|
|
|
|
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 = 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;
|
|
|
|
io_cq_lock(ctx);
|
|
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);
|
|
io_cq_unlock_post(ctx);
|
|
return canceled != 0;
|
|
}
|