Only count mounts that are from other pods

pkg/controller/volume/attachdetach/attach_detach_controller.go

@@ -522,6 +522,10 @@ func (adc *attachDetachController) GetVolumeDevicePluginDir(podUID string) strin
 	return ""
 }
 
+func (adc *attachDetachController) GetPodsDir() string {
+	return ""
+}
+
 func (adc *attachDetachController) GetPodVolumeDir(podUID types.UID, pluginName, volumeName string) string {
 	return ""
 }

pkg/controller/volume/expand/expand_controller.go

@@ -227,6 +227,10 @@ func (expc *expandController) GetVolumeDevicePluginDir(pluginName string) string
 	return ""
 }
 
+func (expc *expandController) GetPodsDir() string {
+	return ""
+}
+
 func (expc *expandController) GetPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string {
 	return ""
 }

pkg/controller/volume/persistentvolume/volume_host.go

@@ -42,6 +42,10 @@ func (ctrl *PersistentVolumeController) GetVolumeDevicePluginDir(pluginName stri
 	return ""
 }
 
+func (ctrl *PersistentVolumeController) GetPodsDir() string {
+	return ""
+}
+
 func (ctrl *PersistentVolumeController) GetPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string {
 	return ""
 }

pkg/kubelet/volume_host.go

@@ -93,6 +93,10 @@ func (kvh *kubeletVolumeHost) GetVolumeDevicePluginDir(pluginName string) string
 	return kvh.kubelet.getVolumeDevicePluginDir(pluginName)
 }
 
+func (kvh *kubeletVolumeHost) GetPodsDir() string {
+	return kvh.kubelet.getPodsDir()
+}
+
 func (kvh *kubeletVolumeHost) GetPodVolumeDir(podUID types.UID, pluginName string, volumeName string) string {
 	dir := kvh.kubelet.getPodVolumeDir(podUID, pluginName, volumeName)
 	if runtime.GOOS == "windows" {

pkg/volume/local/local.go

@@ -19,8 +19,9 @@ package local
 import (
 	"fmt"
 	"os"
-	"path"
+	"path/filepath"
 	"runtime"
+	"strings"
 
 	"github.com/golang/glog"
 
@@ -31,7 +32,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/events"
 	"k8s.io/kubernetes/pkg/util/keymutex"
 	"k8s.io/kubernetes/pkg/util/mount"
-	"k8s.io/kubernetes/pkg/util/strings"
+	stringsutil "k8s.io/kubernetes/pkg/util/strings"
 	"k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/util"
 	"k8s.io/kubernetes/pkg/volume/validation"
@@ -219,7 +220,7 @@ type localVolume struct {
 }
 
 func (l *localVolume) GetPath() string {
-	return l.plugin.host.GetPodVolumeDir(l.podUID, strings.EscapeQualifiedNameForDisk(localVolumePluginName), l.volName)
+	return l.plugin.host.GetPodVolumeDir(l.podUID, stringsutil.EscapeQualifiedNameForDisk(localVolumePluginName), l.volName)
 }
 
 type localVolumeMounter struct {
@@ -280,6 +281,8 @@ func (m *localVolumeMounter) SetUpAt(dir string, fsGroup *int64) error {
 			return err
 		}
 
+		// Only count mounts from other pods
+		refs = m.filterPodMounts(refs)
 		if len(refs) > 0 {
 			fsGroupNew := int64(*fsGroup)
 			fsGroupSame, fsGroupOld, err := volume.IsSameFSGroup(m.globalPath, fsGroupNew)
@@ -344,6 +347,17 @@ func (m *localVolumeMounter) SetUpAt(dir string, fsGroup *int64) error {
 	return nil
 }
 
+// filterPodMounts only returns mount paths inside the kubelet pod directory
+func (m *localVolumeMounter) filterPodMounts(refs []string) []string {
+	filtered := []string{}
+	for _, r := range refs {
+		if strings.HasPrefix(r, m.plugin.host.GetPodsDir()+string(os.PathSeparator)) {
+			filtered = append(filtered, r)
+		}
+	}
+	return filtered
+}
+
 type localVolumeUnmounter struct {
 	*localVolume
 }
@@ -392,7 +406,7 @@ func (u *localVolumeUnmapper) TearDownDevice(mapPath, devicePath string) error {
 // GetGlobalMapPath returns global map path and error.
 // path: plugins/kubernetes.io/kubernetes.io/local-volume/volumeDevices/{volumeName}
 func (lv *localVolume) GetGlobalMapPath(spec *volume.Spec) (string, error) {
-	return path.Join(lv.plugin.host.GetVolumeDevicePluginDir(strings.EscapeQualifiedNameForDisk(localVolumePluginName)),
+	return filepath.Join(lv.plugin.host.GetVolumeDevicePluginDir(stringsutil.EscapeQualifiedNameForDisk(localVolumePluginName)),
 		lv.volName), nil
 }
 
@@ -401,5 +415,5 @@ func (lv *localVolume) GetGlobalMapPath(spec *volume.Spec) (string, error) {
 // volName: local-pv-ff0d6d4
 func (lv *localVolume) GetPodDeviceMapPath() (string, string) {
 	return lv.plugin.host.GetPodVolumeDeviceDir(lv.podUID,
-		strings.EscapeQualifiedNameForDisk(localVolumePluginName)), lv.volName
+		stringsutil.EscapeQualifiedNameForDisk(localVolumePluginName)), lv.volName
 }

pkg/volume/local/local_test.go

@@ -22,6 +22,8 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"path/filepath"
+	"reflect"
 	"runtime"
 	"testing"
 
@@ -447,3 +449,57 @@ func TestUnsupportedPlugins(t *testing.T) {
 		t.Errorf("Provisionable plugin found, expected none")
 	}
 }
+
+func TestFilterPodMounts(t *testing.T) {
+	tmpDir, plug := getPlugin(t)
+	defer os.RemoveAll(tmpDir)
+
+	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{UID: types.UID("poduid")}}
+	mounter, err := plug.NewMounter(getTestVolume(false, tmpDir, false), pod, volume.VolumeOptions{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	lvMounter, ok := mounter.(*localVolumeMounter)
+	if !ok {
+		t.Fatal("mounter is not localVolumeMounter")
+	}
+
+	host := volumetest.NewFakeVolumeHost(tmpDir, nil, nil)
+	podsDir := host.GetPodsDir()
+
+	cases := map[string]struct {
+		input    []string
+		expected []string
+	}{
+		"empty": {
+			[]string{},
+			[]string{},
+		},
+		"not-pod-mount": {
+			[]string{"/mnt/outside"},
+			[]string{},
+		},
+		"pod-mount": {
+			[]string{filepath.Join(podsDir, "pod-mount")},
+			[]string{filepath.Join(podsDir, "pod-mount")},
+		},
+		"not-directory-prefix": {
+			[]string{podsDir + "pod-mount"},
+			[]string{},
+		},
+		"mix": {
+			[]string{"/mnt/outside",
+				filepath.Join(podsDir, "pod-mount"),
+				"/another/outside",
+				filepath.Join(podsDir, "pod-mount2")},
+			[]string{filepath.Join(podsDir, "pod-mount"),
+				filepath.Join(podsDir, "pod-mount2")},
+		},
+	}
+	for name, test := range cases {
+		output := lvMounter.filterPodMounts(test.input)
+		if !reflect.DeepEqual(output, test.expected) {
+			t.Errorf("%v failed: output %+v doesn't equal expected %+v", name, output, test.expected)
+		}
+	}
+}

pkg/volume/plugins.go

@@ -249,6 +249,10 @@ type VolumeHost interface {
 	// ex. plugins/kubernetes.io/{PluginName}/{DefaultKubeletVolumeDevicesDirName}/{volumePluginDependentPath}/
 	GetVolumeDevicePluginDir(pluginName string) string
 
+	// GetPodsDir returns the absolute path to a directory where all the pods
+	// information is stored
+	GetPodsDir() string
+
 	// GetPodVolumeDir returns the absolute path a directory which
 	// represents the named volume under the named plugin for the given
 	// pod.  If the specified pod does not exist, the result of this call

pkg/volume/testing/testing.go

@@ -95,6 +95,10 @@ func (f *fakeVolumeHost) GetVolumeDevicePluginDir(pluginName string) string {
 	return path.Join(f.rootDir, "plugins", pluginName, "volumeDevices")
 }
 
+func (f *fakeVolumeHost) GetPodsDir() string {
+	return path.Join(f.rootDir, "pods")
+}
+
 func (f *fakeVolumeHost) GetPodVolumeDir(podUID types.UID, pluginName, volumeName string) string {
 	return path.Join(f.rootDir, "pods", string(podUID), "volumes", pluginName, volumeName)
 }