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 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXRAID) += linux_raid.o
22
23 //config:
24 //config:config FEATURE_VOLUMEID_LINUXRAID
25 //config: bool "linuxraid"
26 //config: default y
27 //config: depends on VOLUMEID
28 //config: help
29 //config: TODO
30 //config:
31
32 #include "volume_id_internal.h"
33
34 struct mdp_super_block {
35 uint32_t md_magic;
36 uint32_t major_version;
37 uint32_t minor_version;
38 uint32_t patch_version;
39 uint32_t gvalid_words;
40 uint32_t set_uuid0;
41 uint32_t ctime;
42 uint32_t level;
43 uint32_t size;
44 uint32_t nr_disks;
45 uint32_t raid_disks;
46 uint32_t md_minor;
47 uint32_t not_persistent;
48 uint32_t set_uuid1;
49 uint32_t set_uuid2;
50 uint32_t set_uuid3;
51 } PACKED;
52
53 #define MD_RESERVED_BYTES 0x10000
54 #define MD_MAGIC 0xa92b4efc
55
volume_id_probe_linux_raid(struct volume_id * id,uint64_t size)56 int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
57 {
58 typedef uint32_t aliased_uint32_t FIX_ALIASING;
59 #define off ((uint64_t)0)
60 uint64_t sboff;
61 uint8_t uuid[16];
62 struct mdp_super_block *mdp;
63
64 dbg("probing at offset 0x%llx, size 0x%llx",
65 (unsigned long long) off, (unsigned long long) size);
66
67 if (size < 0x10000)
68 return -1;
69
70 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
71 mdp = volume_id_get_buffer(id, off + sboff, 0x800);
72 if (mdp == NULL)
73 return -1;
74
75 if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
76 return -1;
77
78 *(aliased_uint32_t*)uuid = mdp->set_uuid0;
79 memcpy(&uuid[4], &mdp->set_uuid1, 12);
80 volume_id_set_uuid(id, uuid, UUID_DCE);
81
82 // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
83 // le32_to_cpu(mdp->major_version),
84 // le32_to_cpu(mdp->minor_version),
85 // le32_to_cpu(mdp->patch_version));
86
87 dbg("found raid signature");
88 // volume_id_set_usage(id, VOLUME_ID_RAID);
89 IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
90
91 return 0;
92 }
93