code: func (u *storageosUtil) DeviceDir(b *storageosMounter) string {
  
  	ctrl, err := u.api.Node(b.plugin.host.GetHostName())
  	if err != nil {
  		klog.Warningf("node device path lookup failed: %v", err)
  		return defaultDeviceDir
  	}
  	if ctrl == nil || ctrl.DeviceDir == "" {
  		klog.Warningf("node device path not set, using default: %s", defaultDeviceDir)
  		return defaultDeviceDir
  	}
  	return ctrl.DeviceDir
  }
docs: // Get the node's device path from the API, falling back to the default if not
  // specified.