code: func CheckPersistentVolumeClaimModeBlock(pvc *v1.PersistentVolumeClaim) bool {
  	return utilfeature.DefaultFeatureGate.Enabled(features.BlockVolume) && pvc.Spec.VolumeMode != nil && *pvc.Spec.VolumeMode == v1.PersistentVolumeBlock
  }
docs: // CheckPersistentVolumeClaimModeBlock checks VolumeMode.
  // If the mode is Block, return true otherwise return false.