busybox

/* vi: set sw=4 ts=4: */

/*

 * closefs.c --- close an ext2 filesystem

 *

 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Public

 * License.

 * %End-Header%

 */

​

#include <stdio.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

#include <time.h>

#include <string.h>

​

#include "ext2_fs.h"

#include "ext2fsP.h"

​

static int test_root(int a, int b)

{

    if (a == 0)

        return 1;

    while (1) {

        if (a == 1)

            return 1;

        if (a % b)

            return 0;

        a = a / b;

    }

}

​

int ext2fs_bg_has_super(ext2_filsys fs, int group_block)

{

    if (!(fs->super->s_feature_ro_compat &

          EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER))

        return 1;

​

    if (test_root(group_block, 3) || (test_root(group_block, 5)) ||

        test_root(group_block, 7))

        return 1;

​

    return 0;

}

​

int ext2fs_super_and_bgd_loc(ext2_filsys fs,

                 dgrp_t group,

                 blk_t *ret_super_blk,

                 blk_t *ret_old_desc_blk,

                 blk_t *ret_new_desc_blk,

                 int *ret_meta_bg)

{

    blk_t   group_block, super_blk = 0, old_desc_blk = 0, new_desc_blk = 0;

    unsigned int meta_bg, meta_bg_size;

    int numblocks, has_super;

    int old_desc_blocks;

​

    group_block = fs->super->s_first_data_block +

        (group * fs->super->s_blocks_per_group);

​