code: func (m *csiBlockMapper) getStagingPath() string {
  	sanitizedSpecVolID := utilstrings.EscapeQualifiedName(m.specName)
  	return filepath.Join(m.plugin.host.GetVolumeDevicePluginDir(CSIPluginName), "staging", sanitizedSpecVolID)
  }
docs: // getStagingPath returns a staging path for a directory (on the node) that should be used on NodeStageVolume/NodeUnstageVolume
  // Example: plugins/kubernetes.io/csi/volumeDevices/staging/{pvname}