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Allow RAID scrubbing on cache origin sub-LV
This patch adds the ability to perform RAID scrubbing on the cache
origin sub-LV (https://bugzilla.redhat.com/1169495). Cache origin
operations are restricted to non-clustered RAID LVs until there can
be further testing in a cluster (even for exclusive activation).
User can either specify directly _corig LV
or he can specify cache LV and operation --syncation is
passed ONLY to _corig LV.
If users wants to manipulation with cache-pool devices - he
needs to specify this object name.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
When directly corrupting RAID images for the purpose of testing,
we must use direct I/O (or a 'sync' after the 'dd') to ensure that
the writes are not caught in the buffer cache in a way that is not
reachable by the top-level RAID device.