2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 #include <asm/types.h>
37 #include "volume_id.h"
42 struct ext2_super_block {
46 __u32 free_blocks_count;
47 __u32 free_inodes_count;
48 __u32 first_data_block;
55 __u32 feature_incompat;
56 __u32 feature_ro_compat;
59 } __attribute__((__packed__));
61 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x00000004
62 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x00000008
63 #define EXT_SUPERBLOCK_OFFSET 0x400
65 int volume_id_probe_ext(struct volume_id *id, __u64 off)
67 struct ext2_super_block *es;
69 dbg("probing at offset 0x%llx", (unsigned long long) off);
71 es = (struct ext2_super_block *) volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
75 if (es->magic[0] != 0123 ||
79 volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
80 volume_id_set_label_raw(id, es->volume_name, 16);
81 volume_id_set_label_string(id, es->volume_name, 16);
82 volume_id_set_uuid(id, es->uuid, UUID_DCE);
84 if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)