source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/read_bb.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: 2.0 KB
Line 
1/*
2 * read_bb --- read the bad blocks inode
3 *
4 * Copyright (C) 1994 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
29struct read_bb_record {
30    ext2_badblocks_list bb_list;
31    errcode_t   err;
32};
33
34/*
35 * Helper function for ext2fs_read_bb_inode()
36 */
37#ifdef __TURBOC__
38# pragma argsused
39#endif
40static int mark_bad_block(ext2_filsys fs, blk_t *block_nr,
41              e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
42              blk_t ref_block EXT2FS_ATTR((unused)),
43              int ref_offset EXT2FS_ATTR((unused)),
44              void *priv_data)
45{
46    struct read_bb_record *rb = (struct read_bb_record *) priv_data;
47
48    if (blockcnt < 0)
49        return 0;
50
51    if ((*block_nr < fs->super->s_first_data_block) ||
52        (*block_nr >= fs->super->s_blocks_count))
53        return 0;   /* Ignore illegal blocks */
54
55    rb->err = ext2fs_badblocks_list_add(rb->bb_list, *block_nr);
56    if (rb->err)
57        return BLOCK_ABORT;
58    return 0;
59}
60
61/*
62 * Reads the current bad blocks from the bad blocks inode.
63 */
64errcode_t ext2fs_read_bb_inode(ext2_filsys fs, ext2_badblocks_list *bb_list)
65{
66    errcode_t   retval;
67    struct read_bb_record rb;
68    struct ext2_inode inode;
69    blk_t   numblocks;
70
71    EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
72
73    if (!*bb_list) {
74        retval = ext2fs_read_inode(fs, EXT2_BAD_INO, &inode);
75        if (retval)
76            return retval;
77        if (inode.i_blocks < 500)
78            numblocks = (inode.i_blocks /
79                     (fs->blocksize / 512)) + 20;
80        else
81            numblocks = 500;
82        retval = ext2fs_badblocks_list_create(bb_list, numblocks);
83        if (retval)
84            return retval;
85    }
86
87    rb.bb_list = *bb_list;
88    rb.err = 0;
89    retval = ext2fs_block_iterate2(fs, EXT2_BAD_INO, 0, 0,
90                      mark_bad_block, &rb);
91    if (retval)
92        return retval;
93
94    return rb.err;
95}
96
97
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