pub unsafe extern "C" fn ext2fs_read_bb_FILE2(
    fs: ext2_filsys,
    f: *mut FILE,
    bb_list: *mut ext2_badblocks_list,
    priv_data: *mut c_void,
    invalid: Option<unsafe extern "C" fn(fs: ext2_filsys, blk: blk_t, badstr: *mut c_char, priv_data: *mut c_void)>
) -> errcode_t