VTBLK_MTX
if (mtx_sleep(&sc->vtblk_vq, VTBLK_MTX(sc), PRIBIO, "vtblkq",
mtx_init(VTBLK_MTX((_sc)), (_name), \
#define VTBLK_LOCK(_sc) mtx_lock(VTBLK_MTX((_sc)))
#define VTBLK_UNLOCK(_sc) mtx_unlock(VTBLK_MTX((_sc)))
#define VTBLK_LOCK_DESTROY(_sc) mtx_destroy(VTBLK_MTX((_sc)))
#define VTBLK_LOCK_ASSERT(_sc) mtx_assert(VTBLK_MTX((_sc)), MA_OWNED)
mtx_assert(VTBLK_MTX((_sc)), MA_NOTOWNED)