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_CRAMFS) += cramfs.o
  22
  23//config:
  24//config:config FEATURE_VOLUMEID_CRAMFS
  25//config:       bool "cramfs 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 cramfs_super {
  35        uint32_t        magic;
  36        uint32_t        size;
  37        uint32_t        flags;
  38        uint32_t        future;
  39        uint8_t         signature[16];
  40        struct cramfs_info {
  41                uint32_t        crc;
  42                uint32_t        edition;
  43                uint32_t        blocks;
  44                uint32_t        files;
  45        } PACKED info;
  46        uint8_t         name[16];
  47} PACKED;
  48
  49int FAST_FUNC volume_id_probe_cramfs(struct volume_id *id /*,uint64_t off*/)
  50{
  51#define off ((uint64_t)0)
  52        struct cramfs_super *cs;
  53
  54        dbg("probing at offset 0x%llx", (unsigned long long) off);
  55
  56        cs = volume_id_get_buffer(id, off, 0x200);
  57        if (cs == NULL)
  58                return -1;
  59
  60        if (cs->magic == cpu_to_be32(0x453dcd28)) {
  61//              volume_id_set_label_raw(id, cs->name, 16);
  62                volume_id_set_label_string(id, cs->name, 16);
  63
  64//              volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  65                IF_FEATURE_BLKID_TYPE(id->type = "cramfs";)
  66                return 0;
  67        }
  68
  69        return -1;
  70}
  71