use libblkid to get filesystem type
we can now use libblkid to detect exfat
diff --git a/libblkid/ismounted.h b/libblkid/ismounted.h
new file mode 100644
index 0000000..57918cb
--- /dev/null
+++ b/libblkid/ismounted.h
@@ -0,0 +1,14 @@
+#ifndef IS_MOUNTED_H
+#define IS_MOUNTED_H
+
+#define MF_MOUNTED 1
+#define MF_ISROOT 2
+#define MF_READONLY 4
+#define MF_SWAP 8
+#define MF_BUSY 16
+
+extern int is_mounted(const char *file);
+extern int check_mount_point(const char *device, int *mount_flags,
+ char *mtpt, int mtlen);
+
+#endif /* IS_MOUNTED_H */