R_OFFSET
fnp->name_off = R_OFFSET(dblp, namep);
off = BUCKET(dbmp->mp, R_OFFSET(dbmp, mfp), bhp->pgno);
mf_offset = R_OFFSET(dbmp, mfp);
mf_offset = R_OFFSET(dbmp, mfp);
fmap[cnt] = R_OFFSET(dbmp, mfp);
fmap[cnt] = R_OFFSET(dbmp, mfp);
(u_long)bhp->ref, (u_long)R_OFFSET(dbmp, bhp));
(u_long)bhp->ref, (u_long)R_OFFSET(dbmp, bhp));
*offsetp = R_OFFSET(dbmp, bhp);
mp->htab = R_OFFSET(dbmp, dbmp->htab);
*offsetp = R_OFFSET(dbmp, p);
*offsetp = R_OFFSET(dbmp, bhp);
mf_offset = R_OFFSET(dbmp, dbmfp->mfp);