diff --git a/cephfs/admin/fsadmin.go b/cephfs/admin/fsadmin.go
index 688a808..54e05d6 100644
--- a/cephfs/admin/fsadmin.go
+++ b/cephfs/admin/fsadmin.go
@@ -79,14 +79,8 @@ type listNamedResult struct {
 }
 
 func parseListNames(res []byte, status string, err error) ([]string, error) {
-	if err != nil {
-		return nil, err
-	}
-	if status != "" {
-		return nil, fmt.Errorf("error status: %s", status)
-	}
 	var r []listNamedResult
-	if err := json.Unmarshal(res, &r); err != nil {
+	if err := unmarshalResponseJSON(res, status, err, &r); err != nil {
 		return nil, err
 	}
 	vl := make([]string, len(r))
@@ -111,6 +105,16 @@ func checkEmptyResponseExpected(res []byte, status string, err error) error {
 	return nil
 }
 
+func unmarshalResponseJSON(res []byte, status string, err error, v interface{}) error {
+	if err != nil {
+		return err
+	}
+	if status != "" {
+		return fmt.Errorf("error status: %s", status)
+	}
+	return json.Unmarshal(res, v)
+}
+
 // modeString converts a unix-style mode value to a string-ified version in an
 // octal representation (e.g. "777", "700", etc). This format is expected by
 // some of the ceph JSON command inputs.