vold: Add support for xwarp

Signed-off-by: San Mehat <san@google.com>
diff --git a/Xwarp.h b/Xwarp.h
new file mode 100644
index 0000000..918a843
--- /dev/null
+++ b/Xwarp.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2008 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 _XWARP_H
+#define _XWARP_H
+
+#include <unistd.h>
+
+class Xwarp {
+    static const char *XWARP_BACKINGFILE;
+    static const char *XWARP_CFG;
+    static const char *XWARP_READY;
+    static const char *XWARP_MIRROR_STATUS;
+
+public:
+    static int enable();
+    static int disable();
+    static int status(bool *ready, unsigned *mirrorPos, unsigned *maxSize);
+
+private:
+    static int doEnableDisable(bool enable);
+};
+
+#endif