ino_blkatoff
ufs2_daddr_t ino_blkatoff(union dinode *, ino_t, ufs_lbn_t, int *,
blkno = ino_blkatoff(dp, ip.i_number, lbn, &frags, &snapbp);
blkno = ino_blkatoff(dp, inum != 0 ? inum : ip.i_number,
bn = ino_blkatoff(dp, ino, visitlbn, &frags, NULL);
nblk = ino_blkatoff(dp, ino, lbn, frags, NULL);
blk = ino_blkatoff(dip, parent, lbn, &frags, NULL);
blk = ino_blkatoff(dip, parent, lbn, &frags, NULL);