tree 4766e7bd78b91da01ead6e717d095f98eed9bfa1
parent d986fefa3b13a7f63793404c7b5ce64519cb3a8e
author David Anderson <dvander@google.com> 1565218350 -0700
committer David Anderson <dvander@google.com> 1565228542 -0700

libsnapshot: Unmap COW devices when deleting snapshots.

When we stopped unmapping snapshots in DeleteSnapshot, this also stopped
unmapping the COW device. Of course, the caller has no way to unmap this
since it's an implementation detail. Therefore unmap it in
DeleteSnapshot.

This scenario can arise after rewriting or removing a snapshot-merge
device.

Bug: 136678799
Test: manual test
Change-Id: I9d4c8bcfbb95b4454edd1cf0853d51b441e895fa