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.
27 #include "libvolume_id.h"
30 static struct mdp0_super_block {
32 uint32_t major_version;
33 uint32_t minor_version;
34 uint32_t patch_version;
35 uint32_t gvalid_words;
43 uint32_t not_persistent;
49 struct mdp1_super_block {
51 uint32_t major_version;
58 #define MD_RESERVED_BYTES 0x10000
59 #define MD_SB_MAGIC 0xa92b4efc
61 static int volume_id_probe_linux_raid0(struct volume_id *id, uint64_t off, uint64_t size)
69 info("probing at offset 0x%llx, size 0x%llx",
70 (unsigned long long) off, (unsigned long long) size);
74 buf = volume_id_get_buffer(id, off, 0x800);
77 mdp0 = (struct mdp0_super_block *) buf;
79 if (le32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
80 uuid.ints[0] = bswap_32(mdp0->set_uuid0);
81 if (le32_to_cpu(mdp0->minor_version >= 90)) {
82 uuid.ints[1] = bswap_32(mdp0->set_uuid1);
83 uuid.ints[2] = bswap_32(mdp0->set_uuid2);
84 uuid.ints[3] = bswap_32(mdp0->set_uuid3);
90 volume_id_set_uuid(id, uuid.bytes, 0, UUID_MD);
91 snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
92 le32_to_cpu(mdp0->major_version),
93 le32_to_cpu(mdp0->minor_version),
94 le32_to_cpu(mdp0->patch_version));
95 } else if (be32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
96 uuid.ints[0] = mdp0->set_uuid0;
97 if (be32_to_cpu(mdp0->minor_version >= 90)) {
98 uuid.ints[1] = mdp0->set_uuid1;
99 uuid.ints[2] = mdp0->set_uuid2;
100 uuid.ints[3] = mdp0->set_uuid3;
106 volume_id_set_uuid(id, uuid.bytes, 0, UUID_MD);
107 snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
108 be32_to_cpu(mdp0->major_version),
109 be32_to_cpu(mdp0->minor_version),
110 be32_to_cpu(mdp0->patch_version));
114 volume_id_set_usage(id, VOLUME_ID_RAID);
115 id->type = "linux_raid_member";
119 static int volume_id_probe_linux_raid1(struct volume_id *id, uint64_t off, uint64_t size)
123 info("probing at offset 0x%llx, size 0x%llx",
124 (unsigned long long) off, (unsigned long long) size);
126 buf = volume_id_get_buffer(id, off, 0x800);
129 mdp1 = (struct mdp1_super_block *) buf;
131 if (le32_to_cpu(mdp1->magic) != MD_SB_MAGIC)
134 if (le32_to_cpu(mdp1->major_version) != 1)
137 volume_id_set_uuid(id, mdp1->set_uuid, 0, UUID_MD);
138 volume_id_set_label_raw(id, mdp1->set_name, 32);
139 volume_id_set_label_string(id, mdp1->set_name, 32);
140 volume_id_set_usage(id, VOLUME_ID_RAID);
141 id->type = "linux_raid_member";
145 int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
149 /* version 0 at the end of the device */
150 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
151 if (volume_id_probe_linux_raid0(id, off + sboff, size) == 0)
154 /* version 1.0 at the end of the device */
155 sboff = (size & ~(0x1000 - 1)) - 0x2000;
156 if (volume_id_probe_linux_raid1(id, off + sboff, size) == 0) {
157 strcpy(id->type_version, "1.0");
161 /* version 1.1 at the start of the device */
162 if (volume_id_probe_linux_raid1(id, off, size) == 0) {
163 strcpy(id->type_version, "1.1");
167 /* version 1.2 at 4k offset from the start */
168 if (volume_id_probe_linux_raid1(id, off + 0x1000, size) == 0) {
169 strcpy(id->type_version, "1.2");