code: func (attacher *photonPersistentDiskAttacher) GetDeviceMountPath(spec *volume.Spec) (string, error) {
  	volumeSource, _, err := getVolumeSource(spec)
  	if err != nil {
  		klog.Errorf("Photon Controller attacher: GetDeviceMountPath failed to get volume source")
  		return "", err
  	}
  
  	return makeGlobalPDPath(attacher.host, volumeSource.PdID), nil
  }
docs: // GetDeviceMountPath returns a path where the device should
  // point which should be bind mounted for individual volumes.