fix unablility of mounting ext disk read-only

Author: leiyiz

pkg/gce-pd-csi-driver/node.go

@@ -60,6 +60,7 @@ const (
 	volumeLimitBig       int64 = 127
 	defaultLinuxFsType         = "ext4"
 	defaultWindowsFsType       = "ntfs"
+	fsTypeExt3                 = "ext3"
 )
 
 func getDefaultFsType() string {
@@ -311,6 +312,15 @@ func (ns *GCENodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStage
 		return &csi.NodeStageVolumeResponse{}, nil
 	}
 
+	if readonly, _ := getReadOnlyFromCapability(volumeCapability); readonly {
+		options = append(options, "ro")
+
+		// ext4 and ext3 replays the journal which needs write permission. So noload option stops that
+		if fstype == defaultLinuxFsType || fstype == fsTypeExt3 {
+			options = append(options, "noload")
+		}
+	}
+
 	err = formatAndMount(devicePath, stagingTargetPath, fstype, options, ns.Mounter)
 	if err != nil {
 		return nil, status.Error(codes.Internal,