block: remove the WRITE_BARRIER flag
It's unused now. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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It's unused now. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>