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    Subject[RFC PATCHSET block#for-2.6.36-post] block: convert to REQ_FLUSH/FUA
    Date
    Hello,

    This patchset contains five patches to convert block drivers
    implementing REQ_HARDBARRIER to support REQ_FLUSH/FUA.

    0001-block-loop-implement-REQ_FLUSH-FUA-support.patch
    0002-virtio_blk-implement-REQ_FLUSH-FUA-support.patch
    0003-lguest-replace-VIRTIO_F_BARRIER-support-with-VIRTIO_.patch
    0004-md-implment-REQ_FLUSH-FUA-support.patch
    0005-dm-implement-REQ_FLUSH-FUA-support.patch

    I'm fairly sure about conversions 0001-0003. 0004 should be okay
    although multipath wasn't tested. 0005, I'm not quite sure about. It
    works fine for the tests I've done but there are many other targets
    and code paths that I didn't test. So, please be careful with the
    last patch. I think it would be best to route the last two through
    the respective md/dm trees after the core part is merged and pulled
    into those trees.

    The nice thing about the conversion is that in many cases it replaces
    postflush with FUA writes which can be handled by request queues lower
    in the chain. For md/dm, this replaces an array wide cacheflush with
    FUA writes to only affected member devices.

    After this patchset, the followings remain to be converted.

    * blktrace

    * scsi_error.c for some reason tests REQ_HARDBARRIER. I think this
    part can be dropped altogether but am not sure.

    * drbd and xen. I have no idea.

    These patches are on top of

    block#for-2.6.36-post (c047ab2dddeeafbd6f7c00e45a13a5c4da53ea0b)
    + block-replace-barrier-with-sequenced-flush patchset[1]
    + block-fix-incorrect-bio-request-flag-conversion-in-md patch[2]

    and available in the following git tree.

    git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git flush-fua

    and contain the following changes.

    Documentation/lguest/lguest.c | 36 +++-----
    drivers/block/loop.c | 18 ++--
    drivers/block/virtio_blk.c | 26 ++---
    drivers/md/dm-crypt.c | 2
    drivers/md/dm-io.c | 20 ----
    drivers/md/dm-log.c | 2
    drivers/md/dm-raid1.c | 8 -
    drivers/md/dm-region-hash.c | 16 +--
    drivers/md/dm-snap-persistent.c | 2
    drivers/md/dm-snap.c | 6 -
    drivers/md/dm-stripe.c | 2
    drivers/md/dm.c | 180 ++++++++++++++++++++--------------------
    drivers/md/linear.c | 4
    drivers/md/md.c | 117 +++++---------------------
    drivers/md/md.h | 23 +----
    drivers/md/multipath.c | 4
    drivers/md/raid0.c | 4
    drivers/md/raid1.c | 175 +++++++++++++-------------------------
    drivers/md/raid1.h | 2
    drivers/md/raid10.c | 7 -
    drivers/md/raid5.c | 38 ++++----
    drivers/md/raid5.h | 1
    include/linux/virtio_blk.h | 6 +
    23 files changed, 278 insertions(+), 421 deletions(-)

    --
    tejun

    [1] http://thread.gmane.org/gmane.linux.kernel/1022363
    [2] http://thread.gmane.org/gmane.linux.kernel/1023435


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