ffs_blknum
dmax = ffs_blknum(fs, fs->fs_size + fs->fs_frag - 1);
cgsize = ffs_blknum(newsb, cgs[cgn]->cg_ndblk);
cgsize = ffs_blknum(newsb, cgs[cgn]->cg_ndblk);
bpref = ffs_blknum(fs, bpref);
bpref = ffs_blknum(fs, bpref);