mirror of
https://github.com/systemd/systemd.git
synced 2024-11-06 08:26:52 +03:00
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
|
|
* volume_id - reads filesystem label and uuid
|
|
*
|
|
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation version 2 of the License.
|
|
*/
|
|
|
|
#ifndef _GNU_SOURCE
|
|
#define _GNU_SOURCE 1
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <ctype.h>
|
|
|
|
#include "volume_id.h"
|
|
#include "logging.h"
|
|
#include "util.h"
|
|
|
|
struct mdp_super_block {
|
|
uint32_t md_magic;
|
|
uint32_t major_version;
|
|
uint32_t minor_version;
|
|
uint32_t patch_version;
|
|
uint32_t gvalid_words;
|
|
uint32_t set_uuid0;
|
|
uint32_t ctime;
|
|
uint32_t level;
|
|
uint32_t size;
|
|
uint32_t nr_disks;
|
|
uint32_t raid_disks;
|
|
uint32_t md_minor;
|
|
uint32_t not_persistent;
|
|
uint32_t set_uuid1;
|
|
uint32_t set_uuid2;
|
|
uint32_t set_uuid3;
|
|
} PACKED *mdp;
|
|
|
|
#define MD_RESERVED_BYTES 0x10000
|
|
#define MD_MAGIC 0xa92b4efc
|
|
|
|
int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
|
|
{
|
|
const uint8_t *buf;
|
|
uint64_t sboff;
|
|
uint8_t uuid[16];
|
|
|
|
dbg("probing at offset 0x%llx, size 0x%llx",
|
|
(unsigned long long) off, (unsigned long long) size);
|
|
|
|
if (size < 0x10000)
|
|
return -1;
|
|
|
|
sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
|
|
buf = volume_id_get_buffer(id, off + sboff, 0x800);
|
|
if (buf == NULL)
|
|
return -1;
|
|
|
|
mdp = (struct mdp_super_block *) buf;
|
|
|
|
if (le32_to_cpu(mdp->md_magic) != MD_MAGIC)
|
|
return -1;
|
|
|
|
memcpy(uuid, &mdp->set_uuid0, 4);
|
|
memcpy(&uuid[4], &mdp->set_uuid1, 12);
|
|
volume_id_set_uuid(id, uuid, UUID_DCE);
|
|
|
|
snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
|
|
le32_to_cpu(mdp->major_version),
|
|
le32_to_cpu(mdp->minor_version),
|
|
le32_to_cpu(mdp->patch_version));
|
|
|
|
dbg("found raid signature");
|
|
volume_id_set_usage(id, VOLUME_ID_RAID);
|
|
id->type = "linux_raid_member";
|
|
|
|
return 0;
|
|
}
|