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 //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
  34 struct 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
  49 int 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 }