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 * Copyright (C) 2005 Tobias Klauser <tklauser@access.unizh.ch>
   6 *
   7 *      This library is free software; you can redistribute it and/or
   8 *      modify it under the terms of the GNU Lesser General Public
   9 *      License as published by the Free Software Foundation; either
  10 *      version 2.1 of the License, or (at your option) any later version.
  11 *
  12 *      This library is distributed in the hope that it will be useful,
  13 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15 *      Lesser General Public License for more details.
  16 *
  17 *      You should have received a copy of the GNU Lesser General Public
  18 *      License along with this library; if not, write to the Free Software
  19 *      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20 */
  21
  22#include "volume_id_internal.h"
  23
  24struct reiserfs_super_block {
  25        uint32_t        blocks_count;
  26        uint32_t        free_blocks;
  27        uint32_t        root_block;
  28        uint32_t        journal_block;
  29        uint32_t        journal_dev;
  30        uint32_t        orig_journal_size;
  31        uint32_t        dummy2[5];
  32        uint16_t        blocksize;
  33        uint16_t        dummy3[3];
  34        uint8_t         magic[12];
  35        uint32_t        dummy4[5];
  36        uint8_t         uuid[16];
  37        uint8_t         label[16];
  38} PACKED;
  39
  40struct reiser4_super_block {
  41        uint8_t         magic[16];
  42        uint16_t        dummy[2];
  43        uint8_t         uuid[16];
  44        uint8_t         label[16];
  45        uint64_t        dummy2;
  46} PACKED;
  47
  48#define REISERFS1_SUPERBLOCK_OFFSET             0x2000
  49#define REISERFS_SUPERBLOCK_OFFSET              0x10000
  50
  51int FAST_FUNC volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/)
  52{
  53#define off ((uint64_t)0)
  54        struct reiserfs_super_block *rs;
  55        struct reiser4_super_block *rs4;
  56
  57        dbg("reiserfs: probing at offset 0x%llx", (unsigned long long) off);
  58
  59        rs = volume_id_get_buffer(id, off + REISERFS_SUPERBLOCK_OFFSET, 0x200);
  60        if (rs == NULL)
  61                return -1;
  62
  63        if (memcmp(rs->magic, "ReIsErFs", 8) == 0) {
  64                dbg("reiserfs: ReIsErFs, no label");
  65//              strcpy(id->type_version, "3.5");
  66                goto found;
  67        }
  68        if (memcmp(rs->magic, "ReIsEr2Fs", 9) == 0) {
  69                dbg("reiserfs: ReIsEr2Fs");
  70//              strcpy(id->type_version, "3.6");
  71                goto found_label;
  72        }
  73        if (memcmp(rs->magic, "ReIsEr3Fs", 9) == 0) {
  74                dbg("reiserfs: ReIsEr3Fs");
  75//              strcpy(id->type_version, "JR");
  76                goto found_label;
  77        }
  78
  79        rs4 = (struct reiser4_super_block *) rs;
  80        if (memcmp(rs4->magic, "ReIsEr4", 7) == 0) {
  81//              strcpy(id->type_version, "4");
  82//              volume_id_set_label_raw(id, rs4->label, 16);
  83                volume_id_set_label_string(id, rs4->label, 16);
  84                volume_id_set_uuid(id, rs4->uuid, UUID_DCE);
  85                dbg("reiserfs: ReIsEr4, label '%s' uuid '%s'", id->label, id->uuid);
  86                goto found;
  87        }
  88
  89        rs = volume_id_get_buffer(id, off + REISERFS1_SUPERBLOCK_OFFSET, 0x200);
  90        if (rs == NULL)
  91                return -1;
  92
  93        if (memcmp(rs->magic, "ReIsErFs", 8) == 0) {
  94                dbg("reiserfs: ReIsErFs, no label");
  95//              strcpy(id->type_version, "3.5");
  96                goto found;
  97        }
  98
  99        dbg("reiserfs: no signature found");
 100        return -1;
 101
 102 found_label:
 103//      volume_id_set_label_raw(id, rs->label, 16);
 104        volume_id_set_label_string(id, rs->label, 16);
 105        volume_id_set_uuid(id, rs->uuid, UUID_DCE);
 106        dbg("reiserfs: label '%s' uuid '%s'", id->label, id->uuid);
 107
 108 found:
 109//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 110//      id->type = "reiserfs";
 111
 112        return 0;
 113}
 114