LXR busybox/util-linux/volume

   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
  23struct 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
  46int 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}
  75