ubh_setbit
ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, i);
ubh_setbit (UCPI_UBH(ucpi), ucpi->c_freeoff, goal + i);
ubh_setbit(UCPI_UBH(ucpi), ucpi->c_clusteroff, blkno);
ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);