source: branches/3.2/mindi-busybox/util-linux/volume_id/linux_raid.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: 2.3 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 mdp_super_block {
24    uint32_t    md_magic;
25    uint32_t    major_version;
26    uint32_t    minor_version;
27    uint32_t    patch_version;
28    uint32_t    gvalid_words;
29    uint32_t    set_uuid0;
30    uint32_t    ctime;
31    uint32_t    level;
32    uint32_t    size;
33    uint32_t    nr_disks;
34    uint32_t    raid_disks;
35    uint32_t    md_minor;
36    uint32_t    not_persistent;
37    uint32_t    set_uuid1;
38    uint32_t    set_uuid2;
39    uint32_t    set_uuid3;
40} PACKED;
41
42#define MD_RESERVED_BYTES       0x10000
43#define MD_MAGIC            0xa92b4efc
44
45int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
46{
47    typedef uint32_t aliased_uint32_t FIX_ALIASING;
48#define off ((uint64_t)0)
49    uint64_t sboff;
50    uint8_t uuid[16];
51    struct mdp_super_block *mdp;
52
53    dbg("probing at offset 0x%llx, size 0x%llx",
54        (unsigned long long) off, (unsigned long long) size);
55
56    if (size < 0x10000)
57        return -1;
58
59    sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
60    mdp = volume_id_get_buffer(id, off + sboff, 0x800);
61    if (mdp == NULL)
62        return -1;
63
64    if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
65        return -1;
66
67    *(aliased_uint32_t*)uuid = mdp->set_uuid0;
68    memcpy(&uuid[4], &mdp->set_uuid1, 12);
69    volume_id_set_uuid(id, uuid, UUID_DCE);
70
71//  snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
72//      le32_to_cpu(mdp->major_version),
73//      le32_to_cpu(mdp->minor_version),
74//      le32_to_cpu(mdp->patch_version));
75
76    dbg("found raid signature");
77//  volume_id_set_usage(id, VOLUME_ID_RAID);
78    IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
79
80    return 0;
81}
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