diff --git a/Devmapper.h b/Devmapper.h
index 52e2bed..54f808f 100644
--- a/Devmapper.h
+++ b/Devmapper.h
@@ -20,12 +20,16 @@
 #include <unistd.h>
 #include <linux/dm-ioctl.h>
 
+class SocketClient;
+
 class Devmapper {
 public:
     static int create(const char *name, const char *loopFile, const char *key,
                       unsigned int numSectors, char *buffer, size_t len);
     static int destroy(const char *name);
     static int lookupActive(const char *name, char *buffer, size_t len);
+    static int dumpState(SocketClient *c);
+
 private:
     static void *_align(void *ptr, unsigned int a);
     static void ioctlInit(struct dm_ioctl *io, size_t data_size,