I am trying to add snapshots feature introduced in 4.14 to addon-iscsi. But maybe I missed something from its concept.
As I studied other TM backends, snapshots are copies of currently used disk. Snapshots are never used directly. Last “created” or “reverted to” snapshot is marked as “active”. Active snapshot cannot be deleted. It means that I can never delete snapshot that was made as the first, because every time there have to be some active snapshot. Is there anything wrong?