72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
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/*
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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 ext2_super_block {
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uint32_t inodes_count;
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uint32_t blocks_count;
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uint32_t r_blocks_count;
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uint32_t free_blocks_count;
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uint32_t free_inodes_count;
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uint32_t first_data_block;
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uint32_t log_block_size;
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uint32_t dummy3[7];
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uint8_t magic[2];
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uint16_t state;
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uint32_t dummy5[8];
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uint32_t feature_compat;
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uint32_t feature_incompat;
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uint32_t feature_ro_compat;
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uint8_t uuid[16];
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uint8_t volume_name[16];
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} __attribute__((__packed__));
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#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004
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#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
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#define EXT_SUPERBLOCK_OFFSET 0x400
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int volume_id_probe_ext(struct volume_id *id, uint64_t off)
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{
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struct ext2_super_block *es;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
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if (es == NULL)
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return -1;
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if (es->magic[0] != 0123 ||
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es->magic[1] != 0357)
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return -1;
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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volume_id_set_label_raw(id, es->volume_name, 16);
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volume_id_set_label_string(id, es->volume_name, 16);
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volume_id_set_uuid(id, es->uuid, UUID_DCE);
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if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
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id->type = "ext3";
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else
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id->type = "ext2";
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return 0;
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}
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