extern int do_mount_ro (const char *device, const char *mountpoint);
extern int do_mount_options (const char *options, const char *device, const char *mountpoint);
extern int do_mount_vfs (const char *options, const char *vfstype, const char *device, const char *mountpoint);
+extern char *do_debug (const char *subcmd, char * const* const extraargs);