source: branches/3.2/mindi-busybox/util-linux/volume_id/ext.c @ 3186

Last change on this file since 3186 was 2725, checked in by bruno, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 2.2 KB
Line 
1/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
6 *  This library is free software; you can redistribute it and/or
7 *  modify it under the terms of the GNU Lesser General Public
8 *  License as published by the Free Software Foundation; either
9 *  version 2.1 of the License, or (at your option) any later version.
10 *
11 *  This library is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 *  Lesser General Public License for more details.
15 *
16 *  You should have received a copy of the GNU Lesser General Public
17 *  License along with this library; if not, write to the Free Software
18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include "volume_id_internal.h"
22
23struct ext2_super_block {
24    uint32_t    inodes_count;
25    uint32_t    blocks_count;
26    uint32_t    r_blocks_count;
27    uint32_t    free_blocks_count;
28    uint32_t    free_inodes_count;
29    uint32_t    first_data_block;
30    uint32_t    log_block_size;
31    uint32_t    dummy3[7];
32    uint8_t magic[2];
33    uint16_t    state;
34    uint32_t    dummy5[8];
35    uint32_t    feature_compat;
36    uint32_t    feature_incompat;
37    uint32_t    feature_ro_compat;
38    uint8_t uuid[16];
39    uint8_t volume_name[16];
40} PACKED;
41
42#define EXT3_FEATURE_COMPAT_HAS_JOURNAL     0x00000004
43#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV   0x00000008
44#define EXT_SUPERBLOCK_OFFSET           0x400
45
46int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
47{
48#define off ((uint64_t)0)
49    struct ext2_super_block *es;
50
51    dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
52
53    es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
54    if (es == NULL)
55        return -1;
56
57    if (es->magic[0] != 0123 || es->magic[1] != 0357) {
58        dbg("ext: no magic found");
59        return -1;
60    }
61
62//  volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
63//  volume_id_set_label_raw(id, es->volume_name, 16);
64    volume_id_set_label_string(id, es->volume_name, 16);
65    volume_id_set_uuid(id, es->uuid, UUID_DCE);
66    dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
67
68//  if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
69//      id->type = "ext3";
70//  else
71//      id->type = "ext2";
72
73    return 0;
74}
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