Initial public busybox upstream commit
[busybox4maemo] / util-linux / volume_id / ext.c
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
23 struct 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 } __attribute__((__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
46 int volume_id_probe_ext(struct volume_id *id, uint64_t off)
47 {
48         struct ext2_super_block *es;
49
50         dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
51
52         es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
53         if (es == NULL)
54                 return -1;
55
56         if (es->magic[0] != 0123 || es->magic[1] != 0357) {
57                 dbg("ext: no magic found");
58                 return -1;
59         }
60
61 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
62 //      volume_id_set_label_raw(id, es->volume_name, 16);
63         volume_id_set_label_string(id, es->volume_name, 16);
64         volume_id_set_uuid(id, es->uuid, UUID_DCE);
65         dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
66
67 //      if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
68 //              id->type = "ext3";
69 //      else
70 //              id->type = "ext2";
71
72         return 0;
73 }