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lvm2/lib/snapshot
Mike Snitzer 5b7f6ad698 Use snapshot metadata usage to determine if snapshot is empty
Version >= 1.8.0 of the DM snapshot target appends metadata sectors used
to a snapshot's status.  This patch allows LVM2 to accurately determine
if the snapshot store is empty.  Knowing when a snapshot store is empty
is important in the context of snapshot-merge (means merge is complete).

Also update LVM2 to be aware of the possibility for "Merge failed" in
the snapshot-merge target's status.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2010-01-05 21:14:04 +00:00
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