block: rename blk-barrier.c to blk-flush.c
Without ordering requirements, barrier and ordering are minomers. Rename block/blk-barrier.c to block/blk-flush.c. Rename of symbols will follow. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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