io_uring: fail io-wq submission from a task_work

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In case of failure io_wq_submit_work() needs to post an CQE and so
potentially take uring_lock. The safest way to deal with it is to do
that from under task_work where we can safely take the lock.

Also, as io_iopoll_check() holds the lock tight and releases it
reluctantly, it will play nicer in the furuter with notifying an
iopolling task about new such pending failed requests.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2021-02-18 22:32:52 +00:00 • committed by Jens Axboe

parent 792bb6eb86

commit a3df769899

1 changed files with 18 additions and 30 deletions

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fs/io_uring.c

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