--- /dev/null
+#ifndef _DEVMAPPER_H
+#define _DEVMAPPER_H
+
+#include "device-handler.h"
+
+int devmapper_init_snapshot(struct device_handler *handler,
+ struct discover_device *device);
+int devmapper_destroy_snapshot(struct discover_device *device);
+int devmapper_merge_snapshot(struct discover_device *device);
+
+#endif /* _DEVMAPPER_H */