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    SubjectRe: [PATCH 5/5] dm: implement REQ_FLUSH/FUA support
    On Tue, Aug 17, 2010 at 11:33:52AM +0200, Tejun Heo wrote:
    > > That logic wasn't just about retries (at least not in the latest
    > > kernel). With commit 708e929513502fb0 the -EOPNOTSUPP checking also
    > > serves to optimize the barrier+discard case (when discards aren't
    > > supported).
    > With the patch applied, there's no second flush. Those requests would
    > now be REQ_FLUSH + REQ_DISCARD. The first can't be avoided anyway and
    > there won't be the second flush to begin with, so I don't think this
    > worsens anything.

    In fact the pre-flush is completely superflous for discards, but that's a
    separate discussion and should not be changed as part of this patchset but
    rather explicitly.

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      Last update: 2010-08-17 15:17    [W:0.053 / U:0.040 seconds]
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