release/src/router/busybox/util-linux/volume_id/romfs.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_ROMFS) += romfs.o
  22
  23 //config:
  24 //config:config FEATURE_VOLUMEID_ROMFS
  25 //config:       bool "romfs 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 romfs_super {
  35         uint8_t magic[8];
  36         uint32_t size;
  37         uint32_t checksum;
  38         uint8_t name[];
  39 } PACKED;
  40
  41 int FAST_FUNC volume_id_probe_romfs(struct volume_id *id /*,uint64_t off*/)
  42 {
  43 #define off ((uint64_t)0)
  44         struct romfs_super *rfs;
  45
  46         dbg("probing at offset 0x%llx", (unsigned long long) off);
  47
  48         rfs = volume_id_get_buffer(id, off, 0x200);
  49         if (rfs == NULL)
  50                 return -1;
  51
  52         if (memcmp(rfs->magic, "-rom1fs-", 4) == 0) {
  53                 size_t len = strlen((char *)rfs->name);
  54
  55                 if (len) {
  56 //                      volume_id_set_label_raw(id, rfs->name, len);
  57                         volume_id_set_label_string(id, rfs->name, len);
  58                 }
  59
  60 //              volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  61                 IF_FEATURE_BLKID_TYPE(id->type = "romfs";)
  62                 return 0;
  63         }
  64
  65         return -1;
  66 }