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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I'm going to close this since it's not a bug, it's just required for
this blueprint:

https://blueprints.launchpad.net/nova/+spec/extend-in-use-rbd-volumes

We can track the changes with the blueprint.

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1786189

Title:
  Unable to get device_path from network mounted volume in extend in use

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  While implementing support for extending in-use volumes for RBD, I've
  hit a bug as the code relies on the server having access to the
  devices that are visible in its filesystem through the device path. On
  network attached volumes in which the qemu process directly access the
  device over the network, this device_path attribute does not exist
  that leads to an exception.

  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L1636

  ...
              state = guest.get_power_state(self._host)
              active_state = state in (power_state.RUNNING, power_state.PAUSED)
              if active_state:
                  disk_path = connection_info['data']['device_path']              <=====
                  LOG.debug('resizing block device %(dev)s to %(size)u kb',
                            {'dev': disk_path, 'size': new_size})
                  dev = guest.get_block_device(disk_path)
  ...

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