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27#include "volume_id_internal.h"
28
29struct lvm1_super_block {
30 uint8_t id[2];
31} PACKED;
32
33struct 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
43int 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
57
58
59 return 0;
60}
61
62#define LVM2_LABEL_ID "LABELONE"
63#define LVM2LABEL_SCAN_SECTORS 4
64
65int 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:
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89
90
91
92 return 0;
93}
94