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[Yang Shengming <yang.shengming@xxxxxxxxxxx>]

Public bug reported:

when using ceph as backend, instance can resize to a smaller flavor, and
vm_state become error in the end.

nova/virt/libvirt/driver.py:
    @staticmethod
    def _is_booted_from_volume(instance, disk_mapping):
        """Determines whether the VM is booting from volume

        Determines whether the disk mapping indicates that the VM
        is booting from a volume.
        """
        return ((not bool(instance.get('image_ref')))
                or 'disk' not in disk_mapping)

when using rbd as backend, the function cannot find 'disk' in
disk_mapping, and treat it as booted_from_volume

** Affects: nova
     Importance: Undecided
     Assignee: Yang Shengming (yang-shengming)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Yang Shengming (yang-shengming)

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https://bugs.launchpad.net/bugs/1587802

Title:
  libvirt resize down prevention is invalid when using rbd as backend

Status in OpenStack Compute (nova):
  New

Bug description:
  when using ceph as backend, instance can resize to a smaller flavor,
  and vm_state become error in the end.

  nova/virt/libvirt/driver.py:
      @staticmethod
      def _is_booted_from_volume(instance, disk_mapping):
          """Determines whether the VM is booting from volume

          Determines whether the disk mapping indicates that the VM
          is booting from a volume.
          """
          return ((not bool(instance.get('image_ref')))
                  or 'disk' not in disk_mapping)

  when using rbd as backend, the function cannot find 'disk' in
  disk_mapping, and treat it as booted_from_volume

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