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io_uring: reliably cancel linked timeouts 

Linked timeouts are fired asynchronously (i.e. soft-irq), and use
generic cancellation paths to do its stuff, including poking into io-wq.
The problem is that it's racy to access tctx->io_wq, as
io_uring_task_cancel() and others may be happening at this exact moment.
Mark linked timeouts with REQ_F_INLIFGHT for now, making sure there are
no timeouts before io-wq destraction.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
master
Pavel Begunkov 2021-03-04 13:59:25 +00:00 committed by Jens Axboe
parent b05a1bcd40
commit dd59a3d595
1 changed files with 1 additions and 0 deletions
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fs/io_uring.c
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@ -5500,6 +5500,7 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
data->mode = io_translate_timeout_mode(flags);
hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode);
io_req_track_inflight(req);
return 0;
}