adfs_fplus_offset
offset = adfs_fplus_offset(h, dir->pos);
offset = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries));
offset = adfs_fplus_offset(h, 0) - sizeof(bde);
end = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries));
end = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries)) +