dtogd
bn = dtogd(fs, fsbn);
baseblk = dtogd(&sblock, i + j);
bpref = dtogd(fs, bpref);
start = dtogd(fs, bpref) / NBBY;
bpref = dtogd(fs, bpref);
bno = dtogd(fs, bno);
start = dtogd(fs, bpref) / NBBY;
bpref = dtogd(fs, bno);
bpref = dtogd(fs, bpref);
bpref = fragstoblks(fs, dtogd(fs, blknum(fs, bpref)));
bno = dtogd(fs, bno);
bno = dtogd(fs, bno);
start = dtogd(fs, bpref) / NBBY;
bno = dtogd(fs, bprev);
bpref = dtogd(fs, bno);
bno = dtogd(fs, bpref);
cgbno = dtogd(fs, bno);
start = dtogd(fs, bpref) / NBBY;