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
35 #include <asm/types.h>
37 #include "../volume_id.h"
38 #include "../logging.h"
40 #include "linux_raid.h"
42 #define MD_RESERVED_BYTES 0x10000
43 #define MD_MAGIC 0xa92b4efc
45 int volume_id_probe_linux_raid(struct volume_id *id, __u64 off, __u64 size)
47 struct mdp_super_block {
64 } __attribute__((packed)) *mdp;
73 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
74 buf = volume_id_get_buffer(id, off + sboff, 0x800);
78 mdp = (struct mdp_super_block *) buf;
80 if (le32_to_cpu(mdp->md_magic) != MD_MAGIC)
83 memcpy(uuid, &mdp->set_uuid0, 4);
84 memcpy(&uuid[4], &mdp->set_uuid1, 12);
85 volume_id_set_uuid(id, uuid, UUID_DCE);
87 snprintf(id->type_version, VOLUME_ID_FORMAT_SIZE-1, "%u.%u.%u",
88 le32_to_cpu(mdp->major_version),
89 le32_to_cpu(mdp->minor_version),
90 le32_to_cpu(mdp->patch_version));
92 dbg("found raid signature");
93 volume_id_set_usage(id, VOLUME_ID_RAID);
94 id->type = "linux_raid_member";