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_CRAMFS
  21//config:       bool "cramfs filesystem"
  22//config:       default y
  23//config:       depends on VOLUMEID
  24
  25//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_CRAMFS) += cramfs.o
  26
  27#include "volume_id_internal.h"
  28
  29struct cramfs_super {
  30        uint32_t        magic;
  31        uint32_t        size;
  32        uint32_t        flags;
  33        uint32_t        future;
  34        uint8_t         signature[16];
  35        struct cramfs_info {
  36                uint32_t        crc;
  37                uint32_t        edition;
  38                uint32_t        blocks;
  39                uint32_t        files;
  40        } PACKED info;
  41        uint8_t         name[16];
  42} PACKED;
  43
  44int FAST_FUNC volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/)
  45{
  46#define off ((uint64_t)0)
  47        struct cramfs_super *cs;
  48
  49        dbg("probing at offset 0x%llx", (unsigned long long) off);
  50
  51        cs = volume_id_get_buffer(id, off, 0x200);
  52        if (cs == NULL)
  53                return -1;
  54
  55        if (cs->magic == cpu_to_be32(0x453dcd28)) {
  56//              volume_id_set_label_raw(id, cs->name, 16);
  57                volume_id_set_label_string(id, cs->name, 16);
  58
  59//              volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  60                IF_FEATURE_BLKID_TYPE(id->type = "cramfs";)
  61                return 0;
  62        }
  63
  64        return -1;
  65}
  66