io_uring: lazy get task

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There will be multiple places where req->task is used, so refcount-pin
it lazily with introduced *io_{get,put}_req_task(). We need to always
have valid ->task for cancellation reasons, but don't care about pinning
it in some cases. That's why it sets req->task in io_req_init() and
implements get/put laziness with a flag.

This also removes using @current from polling io_arm_poll_handler(),
etc., but doesn't change observable behaviour.

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

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Pavel Begunkov 2020-06-15 10:33:13 +03:00 • committed by Jens Axboe

parent 67c4d9e693

commit 4dd2824d6d

1 changed files with 22 additions and 8 deletions

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fs/io_uring.c

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