release/src/router/busybox/util-linux/volume_id/ext.c

   1 /*
   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
  21 #include "volume_id_internal.h"
  22 #include "bb_e2fs_defs.h"
  23
  24 #define EXT_SUPERBLOCK_OFFSET                   0x400
  25
  26 int FAST_FUNC volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
  27 {
  28 #define off ((uint64_t)0)
  29         struct ext2_super_block *es;
  30
  31         dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
  32
  33         es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
  34         if (es == NULL)
  35                 return -1;
  36
  37         if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
  38                 dbg("ext: no magic found");
  39                 return -1;
  40         }
  41
  42 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  43 //      volume_id_set_label_raw(id, es->volume_name, 16);
  44         volume_id_set_label_string(id, (void*)es->s_volume_name, 16);
  45         volume_id_set_uuid(id, es->s_uuid, UUID_DCE);
  46         dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
  47
  48 #if ENABLE_FEATURE_BLKID_TYPE
  49         if ((es->s_feature_ro_compat & cpu_to_le32(EXT4_FEATURE_RO_COMPAT_HUGE_FILE | EXT4_FEATURE_RO_COMPAT_DIR_NLINK))
  50          || (es->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_EXTENTS | EXT4_FEATURE_INCOMPAT_64BIT))
  51         ) {
  52                 id->type = "ext4";
  53         }
  54         else if (es->s_feature_compat & cpu_to_le32(EXT3_FEATURE_COMPAT_HAS_JOURNAL))
  55                 id->type = "ext3";
  56         else
  57                 id->type = "ext2";
  58 #endif
  59         return 0;
  60 }