[cinder] how cinder gets the volume name when restore from a backup?

Hi, Here is what I do. * Create a volume. * Create a backup of this volume. * Delete the volume. * Restore the volume from backup. The restored volume has different UUID, but the same name. I don't see volume name is stored in backup metadata. How does Cinder know the volume name when restore it from backup, given the volume is already deleted? Thanks! Tony