io_uring: update kiocb->ki_pos at execution time

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commit d34e1e5b39 upstream.

Update kiocb->ki_pos at execution time rather than in io_prep_rw().
io_prep_rw() happens before the job is enqueued to a worker and so the
offset might be read multiple times before being executed once.

Ensures that the file position in a set of _linked_ SQEs will be only
obtained after earlier SQEs have completed, and so will include their
incremented file position.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Dylan Yudaken 2022-02-22 02:55:02 -08:00 • committed by Greg Kroah-Hartman

parent b7958caf41

commit ff8a070253

1 changed files with 18 additions and 8 deletions

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io_uring/io_uring.c

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