io_uring: don't forget to adjust io_size

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We have invariant in io_read() of how much we're trying to read spilled
into an iter and io_size variable. The last one controls decision making
about whether to do read-retries. However, io_size is modified only
after the first read attempt, so if we happen to go for a third retry in
a single call to io_read(), we will get io_size greater than in the
iterator, so may lead to various side effects up to live-locking.

Modify io_size each time.

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

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Pavel Begunkov 2021-02-04 13:52:02 +00:00 • committed by Jens Axboe

parent 6bf985dc50

commit 7335e3bf9d

1 changed files with 5 additions and 9 deletions

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fs/io_uring.c

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