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  • Committer: Bazaar Package Importer
  • Author(s): Yann Dirson
  • Date: 2002-03-21 23:58:48 UTC
  • Revision ID: james.westby@ubuntu.com-20020321235848-cmmy98hy0nihp922
Tags: upstream-1.27
Import upstream version 1.27

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lib/ext2fs/check_desc.c
 
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/*
 
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 * check_desc.c --- Check the group descriptors of an ext2 filesystem
 
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 * 
 
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 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 
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 *
 
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 * %Begin-Header%
 
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 * This file may be redistributed under the terms of the GNU Public
 
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 * License.
 
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 * %End-Header%
 
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 */
 
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#include <stdio.h>
 
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#include <string.h>
 
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#if HAVE_UNISTD_H
 
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#include <unistd.h>
 
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#endif
 
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#include <fcntl.h>
 
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#include <time.h>
 
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#if HAVE_SYS_STAT_H
 
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#include <sys/stat.h>
 
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#endif
 
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#if HAVE_SYS_TYPES_H
 
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#include <sys/types.h>
 
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#endif
 
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#include "ext2_fs.h"
 
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#include "ext2fs.h"
 
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/*
 
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 * This routine sanity checks the group descriptors
 
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 */
 
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errcode_t ext2fs_check_desc(ext2_filsys fs)
 
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{
 
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        int i;
 
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        blk_t block = fs->super->s_first_data_block;
 
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        blk_t next;
 
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        EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 
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        for (i = 0; i < fs->group_desc_count; i++) {
 
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                next = block + fs->super->s_blocks_per_group;
 
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                /*
 
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                 * Check to make sure block bitmap for group is
 
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                 * located within the group.
 
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                 */
 
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                if (fs->group_desc[i].bg_block_bitmap < block ||
 
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                    fs->group_desc[i].bg_block_bitmap >= next)
 
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                        return EXT2_ET_GDESC_BAD_BLOCK_MAP;
 
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                /*
 
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                 * Check to make sure inode bitmap for group is
 
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                 * located within the group
 
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                 */
 
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                if (fs->group_desc[i].bg_inode_bitmap < block ||
 
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                    fs->group_desc[i].bg_inode_bitmap >= next)
 
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                        return EXT2_ET_GDESC_BAD_INODE_MAP;
 
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                /*
 
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                 * Check to make sure inode table for group is located
 
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                 * within the group
 
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                 */
 
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                if (fs->group_desc[i].bg_inode_table < block ||
 
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                    ((fs->group_desc[i].bg_inode_table +
 
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                      fs->inode_blocks_per_group) >= next))
 
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                        return EXT2_ET_GDESC_BAD_INODE_TABLE;
 
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                block = next;
 
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        }
 
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        return 0;
 
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}