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114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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struct lvm1_super_block {
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uint8_t id[2];
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} PACKED;
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struct lvm2_super_block {
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uint8_t id[8];
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uint64_t sector_xl;
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uint32_t crc_xl;
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uint32_t offset_xl;
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uint8_t type[8];
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} PACKED;
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struct lvm2_pv_header {
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uint8_t id[32];
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uint64_t devsize_xl;
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} PACKED;
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#define LVM1_SB_OFF 0x400
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#define LVM1_MAGIC "HM"
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int volume_id_probe_lvm1(struct volume_id *id, uint64_t off, uint64_t size)
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{
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const uint8_t *buf;
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struct lvm1_super_block *lvm;
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info("probing at offset 0x%llx\n", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off + LVM1_SB_OFF, 0x800);
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if (buf == NULL)
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return -1;
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lvm = (struct lvm1_super_block *) buf;
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if (memcmp(lvm->id, LVM1_MAGIC, 2) != 0)
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return -1;
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volume_id_set_usage(id, VOLUME_ID_RAID);
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id->type = "LVM1_member";
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return 0;
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}
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#define LVM2_LABEL_ID "LABELONE"
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#define LVM2LABEL_SCAN_SECTORS 4
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int volume_id_probe_lvm2(struct volume_id *id, uint64_t off, uint64_t size)
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{
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const uint8_t *buf;
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unsigned int soff;
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struct lvm2_super_block *lvm;
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struct lvm2_pv_header *pvhdr;
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dbg("probing at offset 0x%llx\n", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off, LVM2LABEL_SCAN_SECTORS * 0x200);
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if (buf == NULL)
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return -1;
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for (soff = 0; soff < LVM2LABEL_SCAN_SECTORS * 0x200; soff += 0x200) {
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lvm = (struct lvm2_super_block *) &buf[soff];
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if (memcmp(lvm->id, LVM2_LABEL_ID, 8) == 0)
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goto found;
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}
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return -1;
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found:
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dbg("found at offset 0x%x (pv hdr offset 0x%x)\n",
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soff, cpu_to_le32(lvm->offset_xl));
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soff += cpu_to_le32(lvm->offset_xl);
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pvhdr = (struct lvm2_pv_header *) &buf[soff];
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memcpy(id->type_version, lvm->type, 8);
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volume_id_set_usage(id, VOLUME_ID_RAID);
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volume_id_set_uuid(id, pvhdr->id, 0, UUID_LVM);
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id->type = "LVM2_member";
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return 0;
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}
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