change GetFullQualifiedPluginNameForVolume to distinuish different drivers

pkg/volume/util/BUILD

@@ -22,6 +22,7 @@ go_library(
         "//pkg/api/legacyscheme:go_default_library",
         "//pkg/api/v1/pod:go_default_library",
         "//pkg/apis/core/v1/helper:go_default_library",
+        "//pkg/features:go_default_library",
         "//pkg/securitycontext:go_default_library",
         "//pkg/util/resizefs:go_default_library",
         "//pkg/volume:go_default_library",
@@ -38,6 +39,7 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/strategicpatch:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/component-base/metrics:go_default_library",
         "//staging/src/k8s.io/component-base/metrics/legacyregistry:go_default_library",
@@ -54,6 +56,7 @@ go_test(
         "atomic_writer_test.go",
         "attach_limit_test.go",
         "device_util_linux_test.go",
+        "metrics_test.go",
         "nested_volumes_test.go",
         "resize_util_test.go",
         "util_test.go",

pkg/volume/util/metrics.go

@@ -20,8 +20,10 @@ import (
 	"fmt"
 	"time"
 
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/component-base/metrics"
 	"k8s.io/component-base/metrics/legacyregistry"
+	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/volume"
 )
 
@@ -115,8 +117,13 @@ func OperationCompleteHook(plugin, operationName string) func(*error) {
 // between metrics emitted for CSI volumes which may be handled by different
 // CSI plugin drivers.
 func GetFullQualifiedPluginNameForVolume(pluginName string, spec *volume.Spec) string {
-	if spec != nil && spec.PersistentVolume != nil && spec.PersistentVolume.Spec.CSI != nil {
-		return fmt.Sprintf("%s:%s", pluginName, spec.PersistentVolume.Spec.CSI.Driver)
+	if spec != nil {
+		if spec.Volume != nil && spec.Volume.CSI != nil && utilfeature.DefaultFeatureGate.Enabled(features.CSIInlineVolume) {
+			return fmt.Sprintf("%s:%s", pluginName, spec.Volume.CSI.Driver)
+		}
+		if spec.PersistentVolume != nil && spec.PersistentVolume.Spec.CSI != nil {
+			return fmt.Sprintf("%s:%s", pluginName, spec.PersistentVolume.Spec.CSI.Driver)
+		}
 	}
 	return pluginName
 }

pkg/volume/util/metrics_test.go

@@ -0,0 +1,91 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"fmt"
+	"testing"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/kubernetes/pkg/volume"
+)
+
+func TestGetFullQualifiedPluginNameForVolume(t *testing.T) {
+	var (
+		fakePluginName          = "kubernetes.io/fakePlugin"
+		fakeInlineCSIDriverName = "fake.inline.csi.driver"
+		fakeCSIDriverName       = "fake.csi.driver"
+	)
+
+	testCase := []struct {
+		name         string
+		pluginName   string
+		spec         *volume.Spec
+		wantFullName string
+	}{
+		{
+			name:         "get full qualified plugin name without volume spec",
+			pluginName:   fakePluginName,
+			spec:         nil,
+			wantFullName: fakePluginName,
+		},
+		{
+			name:         "get full qualified plugin name without using CSI plugin",
+			pluginName:   fakePluginName,
+			spec:         &volume.Spec{},
+			wantFullName: fakePluginName,
+		},
+		{
+			name:       "get full qualified plugin name with CSI ephemeral volume",
+			pluginName: fakePluginName,
+			spec: &volume.Spec{
+				Volume: &v1.Volume{
+					VolumeSource: v1.VolumeSource{
+						CSI: &v1.CSIVolumeSource{
+							Driver: fakeInlineCSIDriverName,
+						},
+					},
+				},
+			},
+			wantFullName: fmt.Sprintf("%s:%s", fakePluginName, fakeInlineCSIDriverName),
+		},
+		{
+			name:       "get full qualified plugin name with CSI PV",
+			pluginName: fakePluginName,
+			spec: &volume.Spec{
+				PersistentVolume: &v1.PersistentVolume{
+					Spec: v1.PersistentVolumeSpec{
+						PersistentVolumeSource: v1.PersistentVolumeSource{
+							CSI: &v1.CSIPersistentVolumeSource{
+								Driver: fakeCSIDriverName,
+							},
+						},
+					},
+				},
+			},
+			wantFullName: fmt.Sprintf("%s:%s", fakePluginName, fakeCSIDriverName),
+		},
+	}
+
+	for _, test := range testCase {
+		t.Run(test.name, func(t *testing.T) {
+			if fullPluginName := GetFullQualifiedPluginNameForVolume(test.pluginName, test.spec); fullPluginName != test.wantFullName {
+				t.Errorf("Case name: %s, GetFullQualifiedPluginNameForVolume, pluginName:%s, spec: %v, return:%s, want:%s", test.name, test.pluginName, test.spec, fullPluginName, test.wantFullName)
+			}
+		})
+	}
+}