btodt
bp->b_blkno = bn + btodt(xferoffset - lbnoff);
bp->b_blkno = bn + btodt(xferoffset - lbnoff);
bp->b_blkno = btodt(io_off);
bp->b_lblkno = btodt(offset);
brkp->brkblk = btodt(xap->xa_brksize);
bp->b_lblkno = btodt(uio->uio_loffset);
bp->b_lblkno = btodt(uio->uio_loffset);