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(S)WRITE_SYNC always unplugs the device right after IO submission. Sometimes we want to build up a queue before doing so, so add variants that explicitly DON'T unplug the queue. The caller must then do that after submitting all the IO. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>