source: branches/3.2/mindi-busybox/util-linux/volume_id/ext.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 2.0 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#include "bb_e2fs_defs.h"
23
24#define EXT_SUPERBLOCK_OFFSET           0x400
25
26int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
27{
28#define off ((uint64_t)0)
29    struct ext2_super_block *es;
30
31    dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
32
33    es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
34    if (es == NULL)
35        return -1;
36
37    if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
38        dbg("ext: no magic found");
39        return -1;
40    }
41
42//  volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
43//  volume_id_set_label_raw(id, es->volume_name, 16);
44    volume_id_set_label_string(id, (void*)es->s_volume_name, 16);
45    volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
46    dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
47
48#if ENABLE_FEATURE_BLKID_TYPE
49    if ((es->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK))
50     || (es->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT))
51    ) {
52        id->type = "ext4";
53    }
54    else if (es->s_feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL))
55        id->type = "ext3";
56    else
57        id->type = "ext2";
58#endif
59    return 0;
60}
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