80 lines
2.2 KiB
C
80 lines
2.2 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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#include "volume_id_internal.h"
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struct mdp_super_block {
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uint32_t md_magic;
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uint32_t major_version;
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uint32_t minor_version;
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uint32_t patch_version;
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uint32_t gvalid_words;
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uint32_t set_uuid0;
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uint32_t ctime;
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uint32_t level;
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uint32_t size;
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uint32_t nr_disks;
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uint32_t raid_disks;
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uint32_t md_minor;
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uint32_t not_persistent;
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uint32_t set_uuid1;
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uint32_t set_uuid2;
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uint32_t set_uuid3;
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} __attribute__((packed));
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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, uint64_t off, uint64_t size)
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{
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uint64_t sboff;
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uint8_t uuid[16];
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struct mdp_super_block *mdp;
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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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mdp = volume_id_get_buffer(id, off + sboff, 0x800);
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if (mdp == NULL)
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return -1;
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if (mdp->md_magic != cpu_to_le32(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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