VTBALLOON_MTX
#define VTBALLOON_LOCK_INIT(_sc, _name) mtx_init(VTBALLOON_MTX((_sc)), _name, \
#define VTBALLOON_LOCK(_sc) mtx_lock(VTBALLOON_MTX((_sc)))
#define VTBALLOON_UNLOCK(_sc) mtx_unlock(VTBALLOON_MTX((_sc)))
#define VTBALLOON_LOCK_DESTROY(_sc) mtx_destroy(VTBALLOON_MTX((_sc)))
msleep(sc->vtballoon_td, VTBALLOON_MTX(sc), 0, "vtbdth", 0);
msleep(sc, VTBALLOON_MTX(sc), 0, "vtbspf", 0);
msleep(sc, VTBALLOON_MTX(sc), 0, "vtbslp", timeout);