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"
28 #include "libvolume_id-private.h"
31 struct mdp0_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;
50 struct mdp1_super_block {
52 uint32_t major_version;
59 #define MD_RESERVED_BYTES 0x10000
60 #define MD_SB_MAGIC 0xa92b4efc
62 static int volume_id_probe_linux_raid0(struct volume_id *id, uint64_t off, uint64_t size)
65 struct mdp0_super_block *mdp0;
71 info("probing at offset 0x%llx, size 0x%llx\n",
72 (unsigned long long) off, (unsigned long long) size);
76 buf = volume_id_get_buffer(id, off, 0x800);
79 mdp0 = (struct mdp0_super_block *) buf;
81 if (le32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
82 uuid.ints[0] = bswap_32(mdp0->set_uuid0);
83 if (le32_to_cpu(mdp0->minor_version >= 90)) {
84 uuid.ints[1] = bswap_32(mdp0->set_uuid1);
85 uuid.ints[2] = bswap_32(mdp0->set_uuid2);
86 uuid.ints[3] = bswap_32(mdp0->set_uuid3);
92 volume_id_set_uuid(id, uuid.bytes, 0, UUID_MD);
93 snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
94 le32_to_cpu(mdp0->major_version),
95 le32_to_cpu(mdp0->minor_version),
96 le32_to_cpu(mdp0->patch_version));
97 } else if (be32_to_cpu(mdp0->md_magic) == MD_SB_MAGIC) {
98 uuid.ints[0] = mdp0->set_uuid0;
99 if (be32_to_cpu(mdp0->minor_version >= 90)) {
100 uuid.ints[1] = mdp0->set_uuid1;
101 uuid.ints[2] = mdp0->set_uuid2;
102 uuid.ints[3] = mdp0->set_uuid3;
108 volume_id_set_uuid(id, uuid.bytes, 0, UUID_MD);
109 snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
110 be32_to_cpu(mdp0->major_version),
111 be32_to_cpu(mdp0->minor_version),
112 be32_to_cpu(mdp0->patch_version));
116 volume_id_set_usage(id, VOLUME_ID_RAID);
117 id->type = "linux_raid_member";
121 static int volume_id_probe_linux_raid1(struct volume_id *id, uint64_t off, uint64_t size)
124 struct mdp1_super_block *mdp1;
126 info("probing at offset 0x%llx, size 0x%llx\n",
127 (unsigned long long) off, (unsigned long long) size);
129 buf = volume_id_get_buffer(id, off, 0x800);
132 mdp1 = (struct mdp1_super_block *) buf;
134 if (le32_to_cpu(mdp1->magic) != MD_SB_MAGIC)
137 if (le32_to_cpu(mdp1->major_version) != 1)
140 volume_id_set_uuid(id, mdp1->set_uuid, 0, UUID_MD);
141 volume_id_set_label_raw(id, mdp1->set_name, 32);
142 volume_id_set_label_string(id, mdp1->set_name, 32);
143 volume_id_set_usage(id, VOLUME_ID_RAID);
144 id->type = "linux_raid_member";
148 int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
152 /* version 0 at the end of the device */
153 sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
154 if (volume_id_probe_linux_raid0(id, off + sboff, size) == 0)
157 /* version 1.0 at the end of the device */
158 sboff = (size & ~(0x1000 - 1)) - 0x2000;
159 if (volume_id_probe_linux_raid1(id, off + sboff, size) == 0)
160 strcpy(id->type_version, "1.0");
162 /* version 1.1 at the start of the device */
163 else if (volume_id_probe_linux_raid1(id, off, size) == 0)
164 strcpy(id->type_version, "1.1");
166 /* version 1.2 at 4k offset from the start */
167 else if (volume_id_probe_linux_raid1(id, off + 0x1000, size) == 0)
168 strcpy(id->type_version, "1.2");