xfs: replace barriers with explicit flush / FUA usage
Switch to the WRITE_FLUSH_FUA flag for log writes and remove the EOPNOTSUPP detection for barriers. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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