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//config:config FEATURE_VOLUMEID_JFS
  21//config:       bool "jfs filesystem"
  22//config:       default y
  23//config:       depends on VOLUMEID
  24
  25//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_JFS) += jfs.o
  26
  27#include "volume_id_internal.h"
  28
  29struct jfs_super_block {
  30        uint8_t         magic[4];
  31        uint32_t        version;
  32        uint64_t        size;
  33        uint32_t        bsize;
  34        uint32_t        dummy1;
  35        uint32_t        pbsize;
  36        uint32_t        dummy2[27];
  37        uint8_t         uuid[16];
  38        uint8_t         label[16];
  39        uint8_t         loguuid[16];
  40} PACKED;
  41
  42#define JFS_SUPERBLOCK_OFFSET                   0x8000
  43
  44int FAST_FUNC volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/)
  45{
  46#define off ((uint64_t)0)
  47        struct jfs_super_block *js;
  48
  49        dbg("probing at offset 0x%llx", (unsigned long long) off);
  50
  51        js = volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
  52        if (js == NULL)
  53                return -1;
  54
  55        if (memcmp(js->magic, "JFS1", 4) != 0)
  56                return -1;
  57
  58//      volume_id_set_label_raw(id, js->label, 16);
  59        volume_id_set_label_string(id, js->label, 16);
  60        volume_id_set_uuid(id, js->uuid, UUID_DCE);
  61
  62//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  63        IF_FEATURE_BLKID_TYPE(id->type = "jfs";)
  64
  65        return 0;
  66}
  67