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Denis Vlasenkode7684a2008-02-18 21:08:49 +00001/*
2 * volume_id - reads filesystem label and uuid
3 *
4 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
5 *
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.
10 *
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.
15 *
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
19 */
20
Sven-Göran Bergh3b458012013-07-31 15:45:20 +020021//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_EXT) += ext.o
22
Denis Vlasenkode7684a2008-02-18 21:08:49 +000023#include "volume_id_internal.h"
Denys Vlasenkoac164dd2012-06-12 15:00:35 +020024#include "bb_e2fs_defs.h"
Denis Vlasenkode7684a2008-02-18 21:08:49 +000025
Denis Vlasenkode7684a2008-02-18 21:08:49 +000026#define EXT_SUPERBLOCK_OFFSET 0x400
27
Denys Vlasenko89300962009-11-01 23:07:18 +010028int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
Denis Vlasenkode7684a2008-02-18 21:08:49 +000029{
Denis Vlasenko28ea4292009-02-15 05:51:19 +000030#define off ((uint64_t)0)
Denis Vlasenkode7684a2008-02-18 21:08:49 +000031 struct ext2_super_block *es;
32
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000033 dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
Denis Vlasenkode7684a2008-02-18 21:08:49 +000034
35 es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
36 if (es == NULL)
37 return -1;
38
Denys Vlasenkoac164dd2012-06-12 15:00:35 +020039 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000040 dbg("ext: no magic found");
Denis Vlasenkode7684a2008-02-18 21:08:49 +000041 return -1;
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000042 }
Denis Vlasenkode7684a2008-02-18 21:08:49 +000043
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000044// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
45// volume_id_set_label_raw(id, es->volume_name, 16);
Denys Vlasenkoac164dd2012-06-12 15:00:35 +020046 volume_id_set_label_string(id, (void*)es->s_volume_name, 16);
47 volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
Denis Vlasenkoc5b73722008-03-17 09:21:26 +000048 dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
Denis Vlasenkode7684a2008-02-18 21:08:49 +000049
Denys Vlasenko90615a02010-12-30 00:40:11 +010050#if ENABLE_FEATURE_BLKID_TYPE
Denys Vlasenkoac164dd2012-06-12 15:00:35 +020051 if ((es->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK))
52 || (es->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT))
Denys Vlasenko01339212012-05-18 02:51:27 +020053 ) {
54 id->type = "ext4";
55 }
Denys Vlasenkoac164dd2012-06-12 15:00:35 +020056 else if (es->s_feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL))
Denys Vlasenko90615a02010-12-30 00:40:11 +010057 id->type = "ext3";
58 else
59 id->type = "ext2";
60#endif
Denis Vlasenkode7684a2008-02-18 21:08:49 +000061 return 0;
62}