tree 175577ce2c8ae0918e6f38a2a27ad2b124bb2466
parent 4454a6216f75a9ef8c4bd0a65e34b101f725ef1e
author Mikulas Patocka <mpatocka@redhat.com> 1260489150 +0000
committer Alasdair G Kergon <agk@redhat.com> 1260489150 +0000

dm snapshot: add merge target

The snapshot-merge target allows a snapshot to be merged back into the
snapshot's origin device.

One anticipated use of snapshot merging is the rollback of filesystems
to back out problematic system upgrades.

This patch adds snapshot-merge target management to both
dm_snapshot_init() and dm_snapshot_exit().  As an initial place-holder,
snapshot-merge is identical to the snapshot target.  Documentation is
provided.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>