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dm snapshot: move cow ref from exception store to snap core

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Store the reference to the snapshot cow device in the core snapshot
code instead of each exception store.  It can be accessed through the
new function dm_snap_cow().  Exception stores should each now maintain a
reference to their parent snapshot struct.

This is cleaner and makes part of the forthcoming snapshot merge code simpler.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Mike Snitzer 2009-12-10 23:52:12 +00:00 • committed by Alasdair G Kergon
commit fc56f6fbcc
5 changed files with 78 additions and 57 deletions
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