specify a type on the mount.

Change-Id: I610330e2971aaf235e0420fa7d4387e4f55b0015
diff --git a/roots.c b/roots.c
index fae7faa..8320061 100644
--- a/roots.c
+++ b/roots.c
@@ -126,7 +126,7 @@
     }
     else {
         char mount_cmd[PATH_MAX];
-        sprintf(mount_cmd, "mount -o%s %s %s", fs_options, device, mount_point);
+        sprintf(mount_cmd, "mount -t %s -o%s %s %s", fs_type, fs_options, device, mount_point);
         ret = __system(mount_cmd);
     }
     if (ret == 0)