2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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
21 #include "volume_id_internal.h"
23 struct mdp_super_block
{
25 uint32_t major_version
;
26 uint32_t minor_version
;
27 uint32_t patch_version
;
28 uint32_t gvalid_words
;
36 uint32_t not_persistent
;
42 #define MD_RESERVED_BYTES 0x10000
43 #define MD_MAGIC 0xa92b4efc
45 int FAST_FUNC
volume_id_probe_linux_raid(struct volume_id
*id
/*,uint64_t off*/, uint64_t size
)
47 typedef uint32_t aliased_uint32_t FIX_ALIASING
;
48 #define off ((uint64_t)0)
51 struct mdp_super_block
*mdp
;
53 dbg("probing at offset 0x%llx, size 0x%llx",
54 (unsigned long long) off
, (unsigned long long) size
);
59 sboff
= (size
& ~(MD_RESERVED_BYTES
- 1)) - MD_RESERVED_BYTES
;
60 mdp
= volume_id_get_buffer(id
, off
+ sboff
, 0x800);
64 if (mdp
->md_magic
!= cpu_to_le32(MD_MAGIC
))
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
);
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));
76 dbg("found raid signature");
77 // volume_id_set_usage(id, VOLUME_ID_RAID);
78 IF_FEATURE_BLKID_TYPE(id
->type
= "linux_raid_member";)