add metrics to cinder

cd -> r

fix

pkg/volume/cinder/cinder.go

@@ -79,6 +79,10 @@ const (
 	cinderVolumePluginName = "kubernetes.io/cinder"
 )
 
+func getPath(uid types.UID, volName string, host volume.VolumeHost) string {
+	return host.GetPodVolumeDir(uid, kstrings.EscapeQualifiedNameForDisk(cinderVolumePluginName), volName)
+}
+
 func (plugin *cinderPlugin) Init(host volume.VolumeHost) error {
 	plugin.host = host
 	plugin.volumeLocks = keymutex.NewKeyMutex()
@@ -141,6 +145,7 @@ func (plugin *cinderPlugin) newMounterInternal(spec *volume.Spec, podUID types.U
 			mounter:         mounter,
 			manager:         manager,
 			plugin:          plugin,
+			MetricsProvider: volume.NewMetricsStatFS(getPath(podUID, spec.Name(), plugin.host)),
 		},
 		fsType:             fsType,
 		readOnly:           readOnly,
@@ -159,6 +164,7 @@ func (plugin *cinderPlugin) newUnmounterInternal(volName string, podUID types.UI
 			manager:         manager,
 			mounter:         mounter,
 			plugin:          plugin,
+			MetricsProvider: volume.NewMetricsStatFS(getPath(podUID, volName, plugin.host)),
 		}}, nil
 }
 
@@ -303,7 +309,7 @@ type cinderVolume struct {
 	// diskMounter provides the interface that is used to mount the actual block device.
 	blockDeviceMounter mount.Interface
 	plugin             *cinderPlugin
-	volume.MetricsNil
+	volume.MetricsProvider
 }
 
 func (b *cinderVolumeMounter) GetAttributes() volume.Attributes {
@@ -397,8 +403,7 @@ func makeGlobalPDName(host volume.VolumeHost, devName string) string {
 }
 
 func (cd *cinderVolume) GetPath() string {
-	name := cinderVolumePluginName
-	return cd.plugin.host.GetPodVolumeDir(cd.podUID, kstrings.EscapeQualifiedNameForDisk(name), cd.volName)
+	return getPath(cd.podUID, cd.volName, cd.plugin.host)
 }
 
 type cinderVolumeUnmounter struct {
@@ -484,8 +489,7 @@ type cinderVolumeDeleter struct {
 var _ volume.Deleter = &cinderVolumeDeleter{}
 
 func (r *cinderVolumeDeleter) GetPath() string {
-	name := cinderVolumePluginName
-	return r.plugin.host.GetPodVolumeDir(r.podUID, kstrings.EscapeQualifiedNameForDisk(name), r.volName)
+	return getPath(r.podUID, r.volName, r.plugin.host)
 }
 
 func (r *cinderVolumeDeleter) Delete() error {