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//config:config FEATURE_VOLUMEID_REISERFS
  22//config:       bool "Reiser filesystem"
  23//config:       default y
  24//config:       depends on VOLUMEID
  25
  26//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_REISERFS) += reiserfs.o
  27
  28#include "volume_id_internal.h"
  29
  30struct reiserfs_super_block {
  31        uint32_t        blocks_count;
  32        uint32_t        free_blocks;
  33        uint32_t        root_block;
  34        uint32_t        journal_block;
  35        uint32_t        journal_dev;
  36        uint32_t        orig_journal_size;
  37        uint32_t        dummy2[5];
  38        uint16_t        blocksize;
  39        uint16_t        dummy3[3];
  40        uint8_t         magic[12];
  41        uint32_t        dummy4[5];
  42        uint8_t         uuid[16];
  43        uint8_t         label[16];
  44} PACKED;
  45
  46struct reiser4_super_block {
  47        uint8_t         magic[16];
  48        uint16_t        dummy[2];
  49        uint8_t         uuid[16];
  50        uint8_t         label[16];
  51        uint64_t        dummy2;
  52} PACKED;
  53
  54#define REISERFS1_SUPERBLOCK_OFFSET             0x2000
  55#define REISERFS_SUPERBLOCK_OFFSET              0x10000
  56
  57int FAST_FUNC volume_id_probe_reiserfs(struct volume_id *id /*,uint64_t off*/)
  58{
  59#define off ((uint64_t)0)
  60        struct reiserfs_super_block *rs;
  61        struct reiser4_super_block *rs4;
  62
  63        dbg("reiserfs: probing at offset 0x%llx", (unsigned long long) off);
  64
  65        rs = volume_id_get_buffer(id, off + REISERFS_SUPERBLOCK_OFFSET, 0x200);
  66        if (rs == NULL)
  67                return -1;
  68
  69        if (memcmp(rs->magic, "ReIsErFs", 8) == 0) {
  70                dbg("reiserfs: ReIsErFs, no label");
  71//              strcpy(id->type_version, "3.5");
  72                goto found;
  73        }
  74        if (memcmp(rs->magic, "ReIsEr2Fs", 9) == 0) {
  75                dbg("reiserfs: ReIsEr2Fs");
  76//              strcpy(id->type_version, "3.6");
  77                goto found_label;
  78        }
  79        if (memcmp(rs->magic, "ReIsEr3Fs", 9) == 0) {
  80                dbg("reiserfs: ReIsEr3Fs");
  81//              strcpy(id->type_version, "JR");
  82                goto found_label;
  83        }
  84
  85        rs4 = (struct reiser4_super_block *) rs;
  86        if (memcmp(rs4->magic, "ReIsEr4", 7) == 0) {
  87//              strcpy(id->type_version, "4");
  88//              volume_id_set_label_raw(id, rs4->label, 16);
  89                volume_id_set_label_string(id, rs4->label, 16);
  90                volume_id_set_uuid(id, rs4->uuid, UUID_DCE);
  91                dbg("reiserfs: ReIsEr4, label '%s' uuid '%s'", id->label, id->uuid);
  92                goto found;
  93        }
  94
  95        rs = volume_id_get_buffer(id, off + REISERFS1_SUPERBLOCK_OFFSET, 0x200);
  96        if (rs == NULL)
  97                return -1;
  98
  99        if (memcmp(rs->magic, "ReIsErFs", 8) == 0) {
 100                dbg("reiserfs: ReIsErFs, no label");
 101//              strcpy(id->type_version, "3.5");
 102                goto found;
 103        }
 104
 105        dbg("reiserfs: no signature found");
 106        return -1;
 107
 108 found_label:
 109//      volume_id_set_label_raw(id, rs->label, 16);
 110        volume_id_set_label_string(id, rs->label, 16);
 111        volume_id_set_uuid(id, rs->uuid, UUID_DCE);
 112        dbg("reiserfs: label '%s' uuid '%s'", id->label, id->uuid);
 113
 114 found:
 115//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
 116        IF_FEATURE_BLKID_TYPE(id->type = "reiserfs";)
 117
 118        return 0;
 119}
 120