tree c69f639ecee342d78023fb3d0767bf54155be266
parent 0415767e7f0542b3cd1ab270c2e61e90e87aafa2
author Jens Axboe <axboe@kernel.dk> 1603899203 -0600
committer Jens Axboe <axboe@kernel.dk> 1607540639 -0700

io_uring: only plug when appropriate

We unconditionally call blk_start_plug() when starting the IO
submission, but we only really should do that if we have more than 1
request to submit AND we're potentially dealing with block based storage
underneath. For any other type of request, it's just a waste of time to
do so.

Add a ->plug bit to io_op_def and set it for read/write requests. We
could make this more precise and check the file itself as well, but it
doesn't matter that much and would quickly become more expensive.

Signed-off-by: Jens Axboe <axboe@kernel.dk>