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
21 //kbuild:### lib-$(CONFIG_FEATURE_VOLUMEID_LVM) += lvm.o
22
23 //config:
24 //config:### config FEATURE_VOLUMEID_LVM
25 //config:### bool "lvm"
26 //config:### default y
27 //config:### depends on VOLUMEID
28 //config:### help
29 //config:### TODO
30 //config:
31
32 #include "volume_id_internal.h"
33
34 struct lvm1_super_block {
35 uint8_t id[2];
36 } PACKED;
37
38 struct lvm2_super_block {
39 uint8_t id[8];
40 uint64_t sector_xl;
41 uint32_t crc_xl;
42 uint32_t offset_xl;
43 uint8_t type[8];
44 } PACKED;
45
46 #define LVM1_SB_OFF 0x400
47
volume_id_probe_lvm1(struct volume_id * id,uint64_t off)48 int FAST_FUNC volume_id_probe_lvm1(struct volume_id *id, uint64_t off)
49 {
50 struct lvm1_super_block *lvm;
51
52 dbg("probing at offset 0x%llx", (unsigned long long) off);
53
54 lvm = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
55 if (lvm == NULL)
56 return -1;
57
58 if (lvm->id[0] != 'H' || lvm->id[1] != 'M')
59 return -1;
60
61 // volume_id_set_usage(id, VOLUME_ID_RAID);
62 // id->type = "LVM1_member";
63
64 return 0;
65 }
66
67 #define LVM2_LABEL_ID "LABELONE"
68 #define LVM2LABEL_SCAN_SECTORS 4
69
volume_id_probe_lvm2(struct volume_id * id,uint64_t off)70 int FAST_FUNC volume_id_probe_lvm2(struct volume_id *id, uint64_t off)
71 {
72 const uint8_t *buf;
73 unsigned soff;
74 struct lvm2_super_block *lvm;
75
76 dbg("probing at offset 0x%llx", (unsigned long long) off);
77
78 buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
79 if (buf == NULL)
80 return -1;
81
82
83 for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
84 lvm = (struct lvm2_super_block *) &buf[soff];
85
86 if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
87 goto found;
88 }
89
90 return -1;
91
92 found:
93 // memcpy(id->type_version, lvm->type, 8);
94 // volume_id_set_usage(id, VOLUME_ID_RAID);
95 // id->type = "LVM2_member";
96
97 return 0;
98 }
99