fsdummy
if (fsdummy.fs_magic == FS_UFS1_MAGIC) {
fsdummy.fs_magic = 0;
for (cg = 0; cg < fsdummy.fs_ncg; cg++) {
if (fsbtodb(&fsdummy, cgsblock(&fsdummy, cg)) >
bwrite(&disk, part_ofs + fsbtodb(&fsdummy,
cgsblock(&fsdummy, cg)), chdummy, SBLOCKSIZE);