code: func csiInUse(podSpec *api.PodSpec) bool {
  	if podSpec == nil {
  		return false
  	}
  	for i := range podSpec.Volumes {
  		if podSpec.Volumes[i].CSI != nil {
  			return true
  		}
  	}
  	return false
  }
docs: // csiInUse returns true if any pod's spec include inline CSI volumes.