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"
42 struct lvm1_super_block {
44 } __attribute__((packed));
46 struct lvm2_super_block {
52 } __attribute__((packed));
54 #define LVM1_SB_OFF 0x400
55 #define LVM1_MAGIC "HM"
57 int volume_id_probe_lvm1(struct volume_id *id, __u64 off)
60 struct lvm1_super_block *lvm;
62 dbg("probing at offset 0x%llx", (unsigned long long) off);
64 buf = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
68 lvm = (struct lvm1_super_block *) buf;
70 if (memcmp(lvm->id, LVM1_MAGIC, 2) != 0)
73 volume_id_set_usage(id, VOLUME_ID_RAID);
74 id->type = "LVM1_member";
79 #define LVM2_LABEL_ID "LABELONE"
80 #define LVM2LABEL_SCAN_SECTORS 4
82 int volume_id_probe_lvm2(struct volume_id *id, __u64 off)
86 struct lvm2_super_block *lvm;
88 dbg("probing at offset 0x%llx", (unsigned long long) off);
90 buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
95 for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
96 lvm = (struct lvm2_super_block *) &buf[soff];
98 if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
105 strncpy(id->type_version, lvm->type, 8);
106 volume_id_set_usage(id, VOLUME_ID_RAID);
107 id->type = "LVM2_member";