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101 lines
2.5 KiB
C
101 lines
2.5 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 library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#ifdef HAVE_CONFIG_H
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# include <config.h>
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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 <asm/types.h>
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#include "volume_id.h"
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#include "logging.h"
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#include "util.h"
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#include "linux_raid.h"
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struct mdp_super_block {
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__u32 md_magic;
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__u32 major_version;
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__u32 minor_version;
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__u32 patch_version;
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__u32 gvalid_words;
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__u32 set_uuid0;
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__u32 ctime;
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__u32 level;
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__u32 size;
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__u32 nr_disks;
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__u32 raid_disks;
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__u32 md_minor;
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__u32 not_persistent;
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__u32 set_uuid1;
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__u32 set_uuid2;
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__u32 set_uuid3;
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} __attribute__((packed)) *mdp;
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#define MD_RESERVED_BYTES 0x10000
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#define MD_MAGIC 0xa92b4efc
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int volume_id_probe_linux_raid(struct volume_id *id, __u64 off, __u64 size)
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{
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const __u8 *buf;
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__u64 sboff;
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__u8 uuid[16];
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dbg("probing at offset 0x%llx, size 0x%llx",
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(unsigned long long) off, (unsigned long long) size);
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if (size < 0x10000)
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return -1;
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sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
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buf = volume_id_get_buffer(id, off + sboff, 0x800);
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if (buf == NULL)
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return -1;
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mdp = (struct mdp_super_block *) buf;
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if (le32_to_cpu(mdp->md_magic) != MD_MAGIC)
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return -1;
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memcpy(uuid, &mdp->set_uuid0, 4);
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memcpy(&uuid[4], &mdp->set_uuid1, 12);
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volume_id_set_uuid(id, uuid, UUID_DCE);
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snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
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le32_to_cpu(mdp->major_version),
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le32_to_cpu(mdp->minor_version),
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le32_to_cpu(mdp->patch_version));
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dbg("found raid signature");
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volume_id_set_usage(id, VOLUME_ID_RAID);
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id->type = "linux_raid_member";
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return 0;
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}
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