st_queued_strategy
rval = physio(st_queued_strategy, (struct buf *)NULL,
aphysio(st_queued_strategy, anocancel, dev, flag, st_minphys, aio);
ST_ENTR(ST_DEVINFO, st_queued_strategy);
static int st_queued_strategy(buf_t *bp);
st_queued_strategy, /* strategy Not Block device but async checks */