dm snapshot: permit only one merge at once
Merging more than one snapshot is not supported, so prevent this happening. Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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