dm snapshot: use merge origin if snapshot invalid
If the snapshot we are merging became invalid (e.g. it ran out of space) redirect all I/O directly to the origin device. Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Reviewed-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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