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//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_JFS) += jfs.o
  22
  23//config:
  24//config:config FEATURE_VOLUMEID_JFS
  25//config:       bool "jfs filesystem"
  26//config:       default y
  27//config:       depends on VOLUMEID
  28//config:       help
  29//config:         TODO
  30//config:
  31
  32#include "volume_id_internal.h"
  33
  34struct jfs_super_block {
  35        uint8_t         magic[4];
  36        uint32_t        version;
  37        uint64_t        size;
  38        uint32_t        bsize;
  39        uint32_t        dummy1;
  40        uint32_t        pbsize;
  41        uint32_t        dummy2[27];
  42        uint8_t         uuid[16];
  43        uint8_t         label[16];
  44        uint8_t         loguuid[16];
  45} PACKED;
  46
  47#define JFS_SUPERBLOCK_OFFSET                   0x8000
  48
  49int FAST_FUNC volume_id_probe_jfs(struct volume_id *id /*,uint64_t off*/)
  50{
  51#define off ((uint64_t)0)
  52        struct jfs_super_block *js;
  53
  54        dbg("probing at offset 0x%llx", (unsigned long long) off);
  55
  56        js = volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
  57        if (js == NULL)
  58                return -1;
  59
  60        if (memcmp(js->magic, "JFS1", 4) != 0)
  61                return -1;
  62
  63//      volume_id_set_label_raw(id, js->label, 16);
  64        volume_id_set_label_string(id, js->label, 16);
  65        volume_id_set_uuid(id, js->uuid, UUID_DCE);
  66
  67//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  68        IF_FEATURE_BLKID_TYPE(id->type = "jfs";)
  69
  70        return 0;
  71}
  72