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io_uring: prioritise read success path over fails

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Rearrange io_read return handling so first we expect it completing
successfully and only then checking for errors, which is a colder path.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c91c7c2da11815ec8b04b5d872f60dc4cde662c5.1634144845.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-14 16:10:13 +01:00 committed by Jens Axboe
parent 04f34081c5
commit f80a50a632
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -3487,7 +3487,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
ret = 0;
} else if (ret == -EIOCBQUEUED) {
goto out_free;
} else if (ret <= 0 || ret == req->result || !force_nonblock ||
} else if (ret == req->result || ret <= 0 || !force_nonblock ||
(req->flags & REQ_F_NOWAIT) || !need_read_all(req)) {
/* read all, failed, already did sync or don't want to retry */
goto done;