FSS_BTOCL
cl = FSS_BTOCL(sc, dbtob(bp->b_blkno));
ch = FSS_BTOCL(sc, dbtob(bp->b_blkno)+bp->b_bcount-1);
cl = FSS_BTOCL(sc, dbtob(bp->b_blkno));
ch = FSS_BTOCL(sc, dbtob(bp->b_blkno)+bp->b_bcount-1);
sc->sc_clcount = FSS_BTOCL(sc, bsize-1)+1;
sc->sc_indir_size = FSS_BTOCL(sc, len)+1;