code: func (a *attacherDefaults) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
  	klog.Warning(logPrefix(a.plugin.flexVolumePlugin), "using default WaitForAttach for volume ", spec.Name(), ", device ", devicePath)
  	return devicePath, nil
  }
docs: // WaitForAttach is part of the volume.Attacher interface