source: branches/stable/mindi-busybox/e2fsprogs/ext2fs/check_desc.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.6 KB
Line 
1/*
2 * check_desc.c --- Check the group descriptors of an ext2 filesystem
3 *
4 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#include <fcntl.h>
18#include <time.h>
19#if HAVE_SYS_STAT_H
20#include <sys/stat.h>
21#endif
22#if HAVE_SYS_TYPES_H
23#include <sys/types.h>
24#endif
25
26#include "ext2_fs.h"
27#include "ext2fs.h"
28
29/*
30 * This routine sanity checks the group descriptors
31 */
32errcode_t ext2fs_check_desc(ext2_filsys fs)
33{
34    dgrp_t i;
35    blk_t block = fs->super->s_first_data_block;
36    blk_t next;
37
38    EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
39
40    for (i = 0; i < fs->group_desc_count; i++) {
41        next = block + fs->super->s_blocks_per_group;
42        /*
43         * Check to make sure block bitmap for group is
44         * located within the group.
45         */
46        if (fs->group_desc[i].bg_block_bitmap < block ||
47            fs->group_desc[i].bg_block_bitmap >= next)
48            return EXT2_ET_GDESC_BAD_BLOCK_MAP;
49        /*
50         * Check to make sure inode bitmap for group is
51         * located within the group
52         */
53        if (fs->group_desc[i].bg_inode_bitmap < block ||
54            fs->group_desc[i].bg_inode_bitmap >= next)
55            return EXT2_ET_GDESC_BAD_INODE_MAP;
56        /*
57         * Check to make sure inode table for group is located
58         * within the group
59         */
60        if (fs->group_desc[i].bg_inode_table < block ||
61            ((fs->group_desc[i].bg_inode_table +
62              fs->inode_blocks_per_group) >= next))
63            return EXT2_ET_GDESC_BAD_INODE_TABLE;
64
65        block = next;
66    }
67    return 0;
68}
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