HPPA_LIF_DIRSTART
dbp->b_blkno = btodb(HPPA_LIF_DIRSTART);
dbp->b_cylinder = (HPPA_LIF_DIRSTART) / lp->d_secpercyl;
fp->f_ld = (struct hppa_lifdir *)(fp->f_buf + HPPA_LIF_DIRSTART);
struct hppa_lifdir *lifd = (struct hppa_lifdir *)(buf + HPPA_LIF_DIRSTART);
lifv->vol_addr = htobe32(hppa_btolifs(HPPA_LIF_DIRSTART));