blk: centralize non-request unplug handling.
Both md and umem has similar code for getting notified on an blk_finish_plug event. Centralize this code in block/ and allow each driver to provide its distinctive difference. Signed-off-by: NNeilBrown <neilb@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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