writeback: provide a wakeup_flusher_threads_bdi()
Similar to wakeup_flusher_threads(), except that we only wake up the flusher threads on the specified backing device. No functional changes in this patch. Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Tested-by: NChris Mason <clm@fb.com> Reviewed-by: NJan Kara <jack@suse.cz> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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