io_uring: replace sqd rw_semaphore with mutex

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The only user of read-locking of sqd->rw_lock is sq_thread itself, which
is by definition alone, so we don't really need rw_semaphore, but mutex
will do. Replace it with a mutex, and kill read-to-write upgrading and
extra task_work handling in io_sq_thread().

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

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Pavel Begunkov 2021-03-14 20:57:10 +00:00 • committed by Jens Axboe

parent 180f829fe4

commit 09a6f4efaa

1 changed files with 14 additions and 22 deletions

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fs/io_uring.c

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