Add e2e test to check for filesystem volume device mount cleanup

test/e2e/storage/utils/utils_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2019 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 utils
+
+import (
+	"testing"
+
+	"github.com/onsi/gomega"
+)
+
+func TestFindGlobalVolumeMountPaths(t *testing.T) {
+	tests := []struct {
+		name      string
+		mountInfo string
+		podUID    string
+		expected  []string
+	}{
+		{
+			name: "pod uses local filesystem pv with block source",
+			mountInfo: `1045 245 0:385 / /var/lib/kubelet/pods/ff5e9fa2-7111-486d-854c-848bcc6b3819/volumes/kubernetes.io~secret/default-token-djlt2 rw,relatime shared:199 - tmpfs tmpfs rw
+1047 245 7:6 / /var/lib/kubelet/plugins/kubernetes.io/local-volume/mounts/local-wdx8b rw,relatime shared:200 - ext4 /dev/loop6 rw,data=ordered
+1048 245 7:6 / /var/lib/kubelet/pods/ff5e9fa2-7111-486d-854c-848bcc6b3819/volumes/kubernetes.io~local-volume/local-wdx8b rw,relatime shared:200 - ext4 /dev/loop6 rw,data=ordered
+1054 245 7:6 /provisioning-9823 /var/lib/kubelet/pods/ff5e9fa2-7111-486d-854c-848bcc6b3819/volume-subpaths/local-wdx8b/test-container-subpath-local-preprovisionedpv-d72p/0 rw,relatime shared:200 - ext4 /dev/loop6 rw,data=ordered
+`,
+			podUID: "ff5e9fa2-7111-486d-854c-848bcc6b3819",
+			expected: []string{
+				"/var/lib/kubelet/plugins/kubernetes.io/local-volume/mounts/local-wdx8b",
+			},
+		},
+	}
+
+	g := gomega.NewWithT(t)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			mountPaths, err := findGlobalVolumeMountPaths(tt.mountInfo, tt.podUID)
+			if err != nil {
+				t.Fatal(err)
+			}
+			g.Expect(mountPaths).To(gomega.ConsistOf(tt.expected))
+		})
+	}
+}