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io-wq: fix IO_WQ_WORK_NO_CANCEL cancellation 

To cancel a work, io-wq sets IO_WQ_WORK_CANCEL and executes the
callback. However, IO_WQ_WORK_NO_CANCEL works will just execute and may
return next work, which will be ignored and lost.

Cancel the whole link.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-03-01 19:18:19 +03:00 committed by Jens Axboe
parent 98d54f81e3
commit fc04c39bae
1 changed files with 14 additions and 6 deletions
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20
fs/io-wq.c
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@ -747,6 +747,17 @@ static bool io_wq_can_queue(struct io_wqe *wqe, struct io_wqe_acct *acct,
return true;
}
static void io_run_cancel(struct io_wq_work *work)
{
do {
struct io_wq_work *old_work = work;
work->flags |= IO_WQ_WORK_CANCEL;
work->func(&work);
work = (work == old_work) ? NULL : work;
} while (work);
}
static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
{
struct io_wqe_acct *acct = io_work_get_acct(wqe, work);
@ -760,8 +771,7 @@ static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
* It's close enough to not be an issue, fork() has the same delay.
*/
if (unlikely(!io_wq_can_queue(wqe, acct, work))) {
work->flags |= IO_WQ_WORK_CANCEL;
work->func(&work);
io_run_cancel(work);
return;
}
@ -900,8 +910,7 @@ static enum io_wq_cancel io_wqe_cancel_cb_work(struct io_wqe *wqe,
spin_unlock_irqrestore(&wqe->lock, flags);
if (found) {
work->flags |= IO_WQ_WORK_CANCEL;
work->func(&work);
io_run_cancel(work);
return IO_WQ_CANCEL_OK;
}
@ -976,8 +985,7 @@ static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
spin_unlock_irqrestore(&wqe->lock, flags);
if (found) {
work->flags |= IO_WQ_WORK_CANCEL;
work->func(&work);
io_run_cancel(work);
return IO_WQ_CANCEL_OK;
}