diff --git a/IdleMaint.h b/IdleMaint.h
new file mode 100644
index 0000000..38dadfb
--- /dev/null
+++ b/IdleMaint.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_VOLD_IDLE_MAINT_H
+#define ANDROID_VOLD_IDLE_MAINT_H
+
+#include "android/os/IVoldTaskListener.h"
+
+namespace android {
+namespace vold {
+
+void Trim(const android::sp<android::os::IVoldTaskListener>& listener);
+
+}  // namespace vold
+}  // namespace android
+
+#endif