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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_EXT) += ext.o
//config:config FEATURE_VOLUMEID_EXT
//config: bool "Ext filesystem"
//config: default y
//config: depends on VOLUMEID
#include "volume_id_internal.h"
#include "bb_e2fs_defs.h"
#define EXT_SUPERBLOCK_OFFSET 0x400
int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
{
#define off ((uint64_t)0)
struct ext2_super_block *es;
dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
if (es == NULL)
return -1;
if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
dbg("ext: no magic found");
return -1;
}
// volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
// volume_id_set_label_raw(id, es->volume_name, 16);
volume_id_set_label_string(id, (void*)es->s_volume_name, 16);
volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
#if ENABLE_FEATURE_BLKID_TYPE
if ((es->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK))
|| (es->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT))
) {
id->type = "ext4";
}
else if (es->s_feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL))
id->type = "ext3";
else
id->type = "ext2";
#endif
return 0;
}
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