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 "libvolume_id.h"
29 struct lvm1_super_block {
33 struct lvm2_super_block {
41 #define LVM1_SB_OFF 0x400
42 #define LVM1_MAGIC "HM"
44 int volume_id_probe_lvm1(struct volume_id *id, uint64_t off, uint64_t size)
47 struct lvm1_super_block *lvm;
49 info("probing at offset 0x%llx", (unsigned long long) off);
51 buf = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
55 lvm = (struct lvm1_super_block *) buf;
57 if (memcmp(lvm->id, LVM1_MAGIC, 2) != 0)
60 volume_id_set_usage(id, VOLUME_ID_RAID);
61 id->type = "LVM1_member";
66 #define LVM2_LABEL_ID "LABELONE"
67 #define LVM2LABEL_SCAN_SECTORS 4
69 int volume_id_probe_lvm2(struct volume_id *id, uint64_t off, uint64_t size)
73 struct lvm2_super_block *lvm;
75 dbg("probing at offset 0x%llx", (unsigned long long) off);
77 buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
82 for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
83 lvm = (struct lvm2_super_block *) &buf[soff];
85 if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
92 memcpy(id->type_version, lvm->type, 8);
93 volume_id_set_usage(id, VOLUME_ID_RAID);
94 id->type = "LVM2_member";