vold: Bugfixes & cleanups

  - Fix issue where container-names > 64 bytes were getting truncated in the
    kernel. lo_name is only 64 bytes in length, so we now hash the container
    id via md5
  - Add 'dump' command to dump loop and devicemapper status
  - Add 'debug' command to enable more detailed logging at runtime
  - Log vold IPC arguments (minus encryption keys)
  - Fix premature return from Loop::lookupActive() and friends

Change-Id: I0e833261a445ce9dc1a8187e5501d27daba1ca76
Signed-off-by: San Mehat <san@google.com>
diff --git a/Loop.h b/Loop.h
index f06f91d..e48536b 100644
--- a/Loop.h
+++ b/Loop.h
@@ -20,15 +20,19 @@
 #include <unistd.h>
 #include <linux/loop.h>
 
+class SocketClient;
+
 class Loop {
 public:
     static const int LOOP_MAX = 4096;
 public:
-    static int lookupActive(const char *loopFile, char *buffer, size_t len);
-    static int create(const char *loopFile, char *loopDeviceBuffer, size_t len);
+    static int lookupActive(const char *id, char *buffer, size_t len);
+    static int create(const char *id, const char *loopFile, char *loopDeviceBuffer, size_t len);
     static int destroyByDevice(const char *loopDevice);
     static int destroyByFile(const char *loopFile);
     static int createImageFile(const char *file, unsigned int numSectors);
+
+    static int dumpState(SocketClient *c);
 };
 
 #endif