diff --git a/pkg/volume/metrics_du.go b/pkg/volume/metrics_du.go
index 88a985d5ac2..1cae99c1073 100644
--- a/pkg/volume/metrics_du.go
+++ b/pkg/volume/metrics_du.go
@@ -25,7 +25,7 @@ import (
 var _ MetricsProvider = &metricsDu{}
 
 // metricsDu represents a MetricsProvider that calculates the used and
-// available Volume space by executing the "du" command and gathering
+// available Volume space by calling fs.DiskUsage() and gathering
 // filesystem info for the Volume path.
 type metricsDu struct {
 	// the directory path the volume is mounted to.
@@ -46,7 +46,7 @@ func (md *metricsDu) GetMetrics() (*Metrics, error) {
 		return metrics, NewNoPathDefinedError()
 	}
 
-	err := md.runDu(metrics)
+	err := md.runDiskUsage(metrics)
 	if err != nil {
 		return metrics, err
 	}
@@ -64,9 +64,9 @@ func (md *metricsDu) GetMetrics() (*Metrics, error) {
 	return metrics, nil
 }
 
-// runDu executes the "du" command and writes the results to metrics.Used
-func (md *metricsDu) runDu(metrics *Metrics) error {
-	used, err := fs.Du(md.path)
+// runDiskUsage gets disk usage of md.path and writes the results to metrics.Used
+func (md *metricsDu) runDiskUsage(metrics *Metrics) error {
+	used, err := fs.DiskUsage(md.path)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/volume/util/fs/fs.go b/pkg/volume/util/fs/fs.go
index bbb4b0105c5..a80a167eea7 100644
--- a/pkg/volume/util/fs/fs.go
+++ b/pkg/volume/util/fs/fs.go
@@ -54,7 +54,8 @@ func FsInfo(path string) (int64, int64, int64, int64, int64, int64, error) {
 	return available, capacity, usage, inodes, inodesFree, inodesUsed, nil
 }
 
-func Du(path string) (*resource.Quantity, error) {
+// DiskUsage gets disk usage of specified path.
+func DiskUsage(path string) (*resource.Quantity, error) {
 	// Uses the same niceness level as cadvisor.fs does when running du
 	// Uses -B 1 to always scale to a blocksize of 1 byte
 	out, err := exec.Command("nice", "-n", "19", "du", "-s", "-B", "1", path).CombinedOutput()
diff --git a/pkg/volume/util/fs/fs_unsupported.go b/pkg/volume/util/fs/fs_unsupported.go
index b48e4fd20cb..340b4fdc225 100644
--- a/pkg/volume/util/fs/fs_unsupported.go
+++ b/pkg/volume/util/fs/fs_unsupported.go
@@ -29,7 +29,8 @@ func FsInfo(path string) (int64, int64, int64, int64, int64, int64, error) {
 	return 0, 0, 0, 0, 0, 0, fmt.Errorf("FsInfo not supported for this build.")
 }
 
-func Du(path string) (*resource.Quantity, error) {
+// DiskUsage gets disk usage of specified path.
+func DiskUsage(path string) (*resource.Quantity, error) {
 	return nil, fmt.Errorf("Du not supported for this build.")
 }
 
diff --git a/pkg/volume/util/fs/fs_windows.go b/pkg/volume/util/fs/fs_windows.go
index 534604d2b2e..ea8c4784ae9 100644
--- a/pkg/volume/util/fs/fs_windows.go
+++ b/pkg/volume/util/fs/fs_windows.go
@@ -56,7 +56,8 @@ func FsInfo(path string) (int64, int64, int64, int64, int64, int64, error) {
 	return freeBytesAvailable, totalNumberOfBytes, totalNumberOfBytes - freeBytesAvailable, 0, 0, 0, nil
 }
 
-func Du(path string) (*resource.Quantity, error) {
+// DiskUsage gets disk usage of specified path.
+func DiskUsage(path string) (*resource.Quantity, error) {
 	_, _, usage, _, _, _, err := FsInfo(path)
 	if err != nil {
 		return nil, err