fs_old_postbloff
sblock->fs_old_postbloff =
n->fs_old_postbloff = bswap32(o->fs_old_postbloff);
n->fs_old_postbloff = bswap32(o->fs_old_postbloff);
((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \
(fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos))
(bswap32(fs->fs_old_postbloff) == offsetof(struct fs, fs_old_postbl_start)))) {
(fs->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start)))) {