code: func (g *Cloud) GetLabelsForVolume(ctx context.Context, pv *v1.PersistentVolume) (map[string]string, error) {
  	// Ignore any volumes that are being provisioned
  	if pv.Spec.GCEPersistentDisk.PDName == cloudvolume.ProvisionedVolumeName {
  		return nil, nil
  	}
  
  	// If the zone is already labeled, honor the hint
  	zone := pv.Labels[v1.LabelZoneFailureDomain]
  
  	labels, err := g.GetAutoLabelsForPD(pv.Spec.GCEPersistentDisk.PDName, zone)
  	if err != nil {
  		return nil, err
  	}
  
  	return labels, nil
  }
docs: // GetLabelsForVolume retrieved the label info for the provided volume