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
  23 struct ext2_super_block {
  24         uint32_t        inodes_count;
  25         uint32_t        blocks_count;
  26         uint32_t        r_blocks_count;
  27         uint32_t        free_blocks_count;
  28         uint32_t        free_inodes_count;
  29         uint32_t        first_data_block;
  30         uint32_t        log_block_size;
  31         uint32_t        dummy3[7];
  32         uint8_t magic[2];
  33         uint16_t        state;
  34         uint32_t        dummy5[8];
  35         uint32_t        feature_compat;
  36         uint32_t        feature_incompat;
  37         uint32_t        feature_ro_compat;
  38         uint8_t uuid[16];
  39         uint8_t volume_name[16];
  40 } __attribute__((__packed__));
  41
  42 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x00000004
  43 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x00000008
  44 #define EXT_SUPERBLOCK_OFFSET                   0x400
  45
  46 int volume_id_probe_ext(struct volume_id *id /*,uint64_t off*/)
  47 {
  48 #define off ((uint64_t)0)
  49         struct ext2_super_block *es;
  50
  51         dbg("ext: probing at offset 0x%llx", (unsigned long long) off);
  52
  53         es = volume_id_get_buffer(id, off + EXT_SUPERBLOCK_OFFSET, 0x200);
  54         if (es == NULL)
  55                 return -1;
  56
  57         if (es->magic[0] != 0123 || es->magic[1] != 0357) {
  58                 dbg("ext: no magic found");
  59                 return -1;
  60         }
  61
  62 //      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  63 //      volume_id_set_label_raw(id, es->volume_name, 16);
  64         volume_id_set_label_string(id, es->volume_name, 16);
  65         volume_id_set_uuid(id, es->uuid, UUID_DCE);
  66         dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
  67
  68 //      if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
  69 //              id->type = "ext3";
  70 //      else
  71 //              id->type = "ext2";
  72
  73         return 0;
  74 }