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Fix a regression introduced by 7eaceac ("block: remove per-queue plugging"). In that patch, Jens removed the whole mm_unplug_device() function, which used to be the trigger to make umem start to work. We need to implement unplugging to make umem start to work, or I/O will never be triggered. Signed-off-by: Tao Guo <[email protected]> Cc: Neil Brown <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Shaohua Li <[email protected]> Cc: <[email protected]> Acked-by: NeilBrown <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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