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
20 //config:config FEATURE_VOLUMEID_LINUXRAID
21 //config: bool "linuxraid"
23 //config: depends on VOLUMEID
25 //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_LINUXRAID) += linux_raid.o
27 #include "volume_id_internal.h"
29 struct mdp_super_block {
31 uint32_t major_version;
32 uint32_t minor_version;
33 uint32_t patch_version;
34 uint32_t gvalid_words;
42 uint32_t not_persistent;
48 #define MD_RESERVED_BYTES 0x10000
49 #define MD_MAGIC 0xa92b4efc
51 int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
53 typedef uint32_t aliased_uint32_t FIX_ALIASING;
54 #define off ((uint64_t)0)
57 struct mdp_super_block *mdp;
59 dbg("probing at offset 0x%llx, size 0x%llx",
60 (unsigned long long) off, (unsigned long long) size);
65 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
66 mdp = volume_id_get_buffer(id, off + sboff, 0x800);
70 if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
73 *(aliased_uint32_t*)uuid = mdp->set_uuid0;
74 memcpy(&uuid[4], &mdp->set_uuid1, 12);
75 volume_id_set_uuid(id, uuid, UUID_DCE);
77 // snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
78 // le32_to_cpu(mdp->major_version),
79 // le32_to_cpu(mdp->minor_version),
80 // le32_to_cpu(mdp->patch_version));
82 dbg("found raid signature");
83 // volume_id_set_usage(id, VOLUME_ID_RAID);
84 IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)