'Return model update for migrated volume.'

def update_migrated_volume(self, context, volume, new_volume, original_volume_status):

    LOG.debug('volume:    %s', volume.__dict__)
    LOG.debug('new_volume:    %s', new_volume.__dict__)
    LOG.debug('original_volume_status:    %s', original_volume_status)
    _metadata = self._get_volume_metadata(new_volume)
    if (not hasattr(new_volume, '_orig_metadata')):
        model_update = {'metadata': _metadata}
        return model_update
