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    Subject[PATCH v4 00/13] snapshot-merge target
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    The snapshot-merge target allows a snapshot to be merged back into the
    snapshot's origin device.

    One expected use of snapshot merging is the rollback of a root
    filesystem after system upgrades (e.g.: yum update). snapshot-merge
    enables "system rollback" support for any filesystem that is using the
    associated DM/LVM devices.

    * "[PATCH v4 05/13] dm snapshot: add snapshot-merge target" adds further
    documentation to: Documentation/device-mapper/snapshot.txt

    * All patch headers have been revised/audited for added clarity.

    * Both the latest handover (v10) and origin-write patch have been
    included in this series.

    * Aside from snapshot-merge specific testing these patches have
    survived 75+ iterations of lvm2's testsuite without any failures.
    The test kernel was 2.6.32-rc8 and lvm2 was 2.0.55 (with udev_sync
    enabled and dmeventd disabled).

    The snapshot-merge quilt tree is maintained here:
    http://people.redhat.com/msnitzer/patches/snapshot-merge/kernel/2.6.33/

    For LVM2 support please see:
    http://people.redhat.com/msnitzer/patches/snapshot-merge/lvm2/LVM2-2.02.55/

    Mike Snitzer (3):
    dm snapshot: allow live exception store handover between tables
    dm exception store: snapshot-merge usage accounting
    dm snapshot: merge a linear region of chunks using one large IO

    Mikulas Patocka (10):
    dm snapshot: rework writing to snapshot origin
    dm exception store: add snapshot-merge specific methods
    dm snapshot: add snapshot-merge target
    dm snapshot: merge target should not allocate new exceptions
    dm snapshot: do not allow more than one merging snapshot.
    dm snapshot: the merge procedure
    dm snapshot: queue writes to an area that is actively being merged
    dm snapshot: do not merge a chunk until active writes to it finish
    dm snapshot: make exceptions in other snapshots when merging
    dm snapshot: redirect accesses to origin if merging snap invalidated

    Documentation/device-mapper/snapshot.txt | 52 ++-
    drivers/md/dm-exception-store.h | 27 +
    drivers/md/dm-snap-persistent.c | 91 ++++-
    drivers/md/dm-snap.c | 827 ++++++++++++++++++++++++------
    4 files changed, 839 insertions(+), 158 deletions(-)



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