STABLEHASH
st = stable[STABLEHASH(dev)];
sp->s_next = stable[STABLEHASH(sp->s_dev)];
stable[STABLEHASH(sp->s_dev)] = sp;
st = stable[STABLEHASH(sp->s_dev)];
stable[STABLEHASH(sp->s_dev)] = st->s_next;
st = stable[STABLEHASH(dev)];