2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "volume_id.h"
29 #include "linux_raid.h"
31 struct mdp_super_block {
33 uint32_t major_version;
34 uint32_t minor_version;
35 uint32_t patch_version;
36 uint32_t gvalid_words;
44 uint32_t not_persistent;
48 } __attribute__((packed)) *mdp;
50 #define MD_RESERVED_BYTES 0x10000
51 #define MD_MAGIC 0xa92b4efc
53 int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
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 buf = volume_id_get_buffer(id, off + sboff, 0x800);
70 mdp = (struct mdp_super_block *) buf;
72 if (le32_to_cpu(mdp->md_magic) != MD_MAGIC)
75 memcpy(uuid, &mdp->set_uuid0, 4);
76 memcpy(&uuid[4], &mdp->set_uuid1, 12);
77 volume_id_set_uuid(id, uuid, UUID_DCE);
79 snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
80 le32_to_cpu(mdp->major_version),
81 le32_to_cpu(mdp->minor_version),
82 le32_to_cpu(mdp->patch_version));
84 dbg("found raid signature");
85 volume_id_set_usage(id, VOLUME_ID_RAID);
86 id->type = "linux_raid_member";