RDBTOS
sc->sc_ioc.c_addr = RDBTOS(bp->b_rawblkno);
hwbn = RDBTOS(pbn + bp->b_blkno);
sc->sc_ioc.c_addr = RDBTOS(blkno);
rd_ioc.c_addr = RDBTOS(blk);
sc->sc_ioc.c_addr = RDBTOS(blkno);
sc->sc_ioc.c_addr = htobe32(RDBTOS(bp->b_rawblkno));
hwbn = RDBTOS(pbn + bp->b_blkno);