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Remove now unused REQ_HARDBARRIER support. virtio_blk already supports REQ_FLUSH and the usefulness of REQ_FUA for virtio_blk is questionable at this point, so there's nothing else to do to support new REQ_FLUSH/FUA interface. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>