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[Cyril Roelandt <1959186@xxxxxxxxxxxxxxxxxx>]

** Changed in: glance
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1959186

Title:
  [rbd] VM created from snapshot becomes a child of that RBD image

Status in Glance:
  Fix Released
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  When I create an instance from a snapshot, the underlying RBD image of the new instance is actually a child of the snapshot in RBD.
  Then I can't delete that snapshot because in Ceph it has children and is protected, thus Glance will throw this error: "Image <ID> could not be deleted because it is in use: The image cannot be deleted because it is in use through the backend store outside of Glance."

  Steps to reproduce:
  1. Create a server
      $ openstack server create server-1

  2. Create a snapshot from that server
      $ openstack server image create $SERVER_1_ID

  3. Create a new server from the snapshot
      $ openstack server create --image $SNAPSHOT_ID server-2

  4. Try to delete the snapshot, it will throw the above error from Glance (it is in use through the backend store outside of Glance.)
      $ openstack image delete $SNAPSHOT_ID

  5. Check the snapshot image in RBD, it will have the new instance's disk as children.
      $ rbd children images/$SNAPSHOT_ID
      > vms/<server-2>_disk

  This doesn't happen when creating instances from images uploaded
  through glance, but only when using images created with `openstack
  server image create`

  Environment
  - Openstack Xena (Nova 17.6.0)
  - Libvirt with KVM virt_type
  - RBD for ephemeral storage
  - Ceph pacific

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