1 /*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
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.
10 *
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.
15 *
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
19 */
20 //config:### config FEATURE_VOLUMEID_LVM
21 //config:### bool "lvm"
22 //config:### default y
23 //config:### depends on VOLUMEID
24
25 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_LVM) += lvm.o
26
27 #include "volume_id_internal.h"
28
29 struct lvm1_super_block {
30 uint8_t id[2];
31 } PACKED;
32
33 struct lvm2_super_block {
34 uint8_t id[8];
35 uint64_t sector_xl;
36 uint32_t crc_xl;
37 uint32_t offset_xl;
38 uint8_t type[8];
39 } PACKED;
40
41 #define LVM1_SB_OFF 0x400
42
volume_id_probe_lvm1(struct volume_id * id,uint64_t off)43 int FAST_FUNC volume_id_probe_lvm1(struct volume_id *id, uint64_t off)
44 {
45 struct lvm1_super_block *lvm;
46
47 dbg("probing at offset 0x%llx", (unsigned long long) off);
48
49 lvm = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
50 if (lvm == NULL)
51 return -1;
52
53 if (lvm->id[0] != 'H' || lvm->id[1] != 'M')
54 return -1;
55
56 // volume_id_set_usage(id, VOLUME_ID_RAID);
57 // id->type = "LVM1_member";
58
59 return 0;
60 }
61
62 #define LVM2_LABEL_ID "LABELONE"
63 #define LVM2LABEL_SCAN_SECTORS 4
64
volume_id_probe_lvm2(struct volume_id * id,uint64_t off)65 int FAST_FUNC volume_id_probe_lvm2(struct volume_id *id, uint64_t off)
66 {
67 const uint8_t *buf;
68 unsigned soff;
69 struct lvm2_super_block *lvm;
70
71 dbg("probing at offset 0x%llx", (unsigned long long) off);
72
73 buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
74 if (buf == NULL)
75 return -1;
76
77
78 for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
79 lvm = (struct lvm2_super_block *) &buf[soff];
80
81 if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
82 goto found;
83 }
84
85 return -1;
86
87 found:
88 // memcpy(id->type_version, lvm->type, 8);
89 // volume_id_set_usage(id, VOLUME_ID_RAID);
90 // id->type = "LVM2_member";
91
92 return 0;
93 }
94