fs_old_cgoffset
fs->fs_old_cgoffset = roundup(
sblock.fs_old_cgoffset = 0;
fsi_ffs.old_cgoffset = buf.sblk.fs_old_cgoffset;
fsi_ffs.old_cgoffset = buf.sblk.fs_old_cgoffset;
int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
(cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))
fs->fs_old_cgoffset, fs->fs_old_cgmask);
sblock.fs_old_cgoffset = 0;