release/src/router/busybox/util-linux/volume_id/jfs.c

   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
  23 struct 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 } __attribute__((__packed__));
  35
  36 #define JFS_SUPERBLOCK_OFFSET                   0x8000
  37
  38 int 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 }