/* * 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; }