UFS_BLKATOFF
if (UFS_BLKATOFF(vp, (off_t)pos, NULL, &bp) != 0)
if (UFS_BLKATOFF(vp, (off_t)blkoff, NULL, &bp) != 0) {
error = UFS_BLKATOFF(ip->i_vnode, (off_t)pos, (char **)&dp, &bp);
if ((error = UFS_BLKATOFF(dvp, offset, (char **)&ep, &bp)) != 0) {
error = UFS_BLKATOFF(vdp, (off_t)I_OFFSET(dp), (char **)&ep, &bp);
(error = UFS_BLKATOFF(vdp, (off_t)i_offset, NULL, &bp)))
UFS_BLKATOFF(vdp, (off_t)i_offset, NULL, &bp);
error = UFS_BLKATOFF(dvp, (off_t)I_OFFSET(dp), &dirbuf, &bp);
error = UFS_BLKATOFF(vp, uio->uio_offset, NULL, &bp);