Merge pull request kubernetes#38421 from jingxu97/automated-cherry-pi…

…ck-of-#38411-upstream-release-1.5

Automatic merge from submit-queue

Automated cherry pick of kubernetes#38411

Cherry pick of kubernetes#38411 on release-1.5.

kubernetes#38411: Fix unmountDevice issue caused by shared mount in GCI

pkg/util/mount/mount.go

@@ -130,21 +130,13 @@ func GetMountRefs(mounter Interface, mountPath string) ([]string, error) {
 		}
 	}
 
-	// TODO: this is a workaround for the unmount device issue caused by gci mounter.
-	// In GCI cluster, if gci mounter is used for mounting, the container started by mounter
-	// script will cause additional mounts created in the container. Since these mounts are
-	// irrelavant to the original mounts, they should be not considered when checking the
-	// mount references. Current solution is to filter out those mount paths that contain
-	// the string of original mount path.
-	// Plan to work on better approach to solve this issue.
-
 	// Find all references to the device.
 	var refs []string
 	if deviceName == "" {
 		glog.Warningf("could not determine device for path: %q", mountPath)
 	} else {
 		for i := range mps {
-			if mps[i].Device == deviceName && !strings.Contains(mps[i].Path, slTarget) {
+			if mps[i].Device == deviceName && mps[i].Path != slTarget {
 				refs = append(refs, mps[i].Path)
 			}
 		}

pkg/volume/util/operationexecutor/operation_executor.go

@@ -22,6 +22,7 @@ package operationexecutor
 
 import (
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/golang/glog"
@@ -1053,7 +1054,8 @@ func (oe *operationExecutor) generateUnmountDeviceFunc(
 				err)
 		}
 		refs, err := attachableVolumePlugin.GetDeviceMountRefs(deviceMountPath)
-		if err != nil || len(refs) > 0 {
+
+		if err != nil || hasMountRefs(deviceMountPath, refs) {
 			if err == nil {
 				err = fmt.Errorf("The device mount path %q is still mounted by other references %v", deviceMountPath, refs)
 			}
@@ -1124,6 +1126,24 @@ func (oe *operationExecutor) generateUnmountDeviceFunc(
 	}, nil
 }
 
+// TODO: this is a workaround for the unmount device issue caused by gci mounter.
+// In GCI cluster, if gci mounter is used for mounting, the container started by mounter
+// script will cause additional mounts created in the container. Since these mounts are
+// irrelavant to the original mounts, they should be not considered when checking the
+// mount references. Current solution is to filter out those mount paths that contain
+// the string of original mount path.
+// Plan to work on better approach to solve this issue.
+
+func hasMountRefs(mountPath string, mountRefs []string) bool {
+	count := 0
+	for _, ref := range mountRefs {
+		if !strings.Contains(ref, mountPath) {
+			count = count + 1
+		}
+	}
+	return count > 0
+}
+
 func (oe *operationExecutor) generateVerifyControllerAttachedVolumeFunc(
 	volumeToMount VolumeToMount,
 	nodeName types.NodeName,