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    SubjectRe: [PATCH 2/5] virtio_blk: implement REQ_FLUSH/FUA support
    On Mon, Aug 16, 2010 at 06:52:00PM +0200, Tejun Heo wrote:
    > From: Tejun Heo <tj@kernle.org>
    >
    > Remove now unused REQ_HARDBARRIER support and implement REQ_FLUSH/FUA
    > support instead. A new feature flag VIRTIO_BLK_F_FUA is added to
    > indicate the support for FUA.

    I'm not sure it's worth it. The pure REQ_FLUSH path works not and is
    well tested with kvm/qemu. We can still easily add a FUA bit, and
    even a pre-flush bit if the protocol roundtrips matter in real life
    benchmarking.



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