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 struct lvm2_pv_header {
46 #define LVM1_SB_OFF 0x400
47 #define LVM1_MAGIC "HM"
49 int volume_id_probe_lvm1(struct volume_id *id, uint64_t off, uint64_t size)
52 struct lvm1_super_block *lvm;
54 info("probing at offset 0x%llx\n", (unsigned long long) off);
56 buf = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
60 lvm = (struct lvm1_super_block *) buf;
62 if (memcmp(lvm->id, LVM1_MAGIC, 2) != 0)
65 volume_id_set_usage(id, VOLUME_ID_RAID);
66 id->type = "LVM1_member";
71 #define LVM2_LABEL_ID "LABELONE"
72 #define LVM2LABEL_SCAN_SECTORS 4
74 int volume_id_probe_lvm2(struct volume_id *id, uint64_t off, uint64_t size)
78 struct lvm2_super_block *lvm;
79 struct lvm2_pv_header *pvhdr;
81 dbg("probing at offset 0x%llx\n", (unsigned long long) off);
83 buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
88 for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
89 lvm = (struct lvm2_super_block *) &buf[soff];
91 if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
98 dbg("found at offset 0x%x (pv hdr offset 0x%x)\n",
99 soff, cpu_to_le32(lvm->offset_xl));
100 soff += cpu_to_le32(lvm->offset_xl);
101 pvhdr = (struct lvm2_pv_header *) &buf[soff];
102 memcpy(id->type_version, lvm->type, 8);
103 volume_id_set_usage(id, VOLUME_ID_RAID);
104 volume_id_set_uuid(id, pvhdr->id, 0, UUID_LVM);
105 id->type = "LVM2_member";