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 jfs_super_block {
  24        uint8_t         magic[4];
  25        uint32_t        version;
  26        uint64_t        size;
  27        uint32_t        bsize;
  28        uint32_t        dummy1;
  29        uint32_t        pbsize;
  30        uint32_t        dummy2[27];
  31        uint8_t         uuid[16];
  32        uint8_t         label[16];
  33        uint8_t         loguuid[16];
  34} PACKED;
  35
  36#define JFS_SUPERBLOCK_OFFSET                   0x8000
  37
  38int FAST_FUNC volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/)
  39{
  40#define off ((uint64_t)0)
  41        struct jfs_super_block *js;
  42
  43        dbg("probing at offset 0x%llx", (unsigned long long) off);
  44
  45        js = volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
  46        if (js == NULL)
  47                return -1;
  48
  49        if (memcmp(js->magic, "JFS1", 4) != 0)
  50                return -1;
  51
  52//      volume_id_set_label_raw(id, js->label, 16);
  53        volume_id_set_label_string(id, js->label, 16);
  54        volume_id_set_uuid(id, js->uuid, UUID_DCE);
  55
  56//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  57//      id->type = "jfs";
  58
  59        return 0;
  60}
  61