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_XFS
  21//config:       bool "xfs filesystem"
  22//config:       default y
  23//config:       depends on VOLUMEID
  24
  25//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_XFS) += xfs.o
  26
  27#include "volume_id_internal.h"
  28
  29struct xfs_super_block {
  30        uint8_t magic[4];
  31        uint32_t        blocksize;
  32        uint64_t        dblocks;
  33        uint64_t        rblocks;
  34        uint32_t        dummy1[2];
  35        uint8_t uuid[16];
  36        uint32_t        dummy2[15];
  37        uint8_t fname[12];
  38        uint32_t        dummy3[2];
  39        uint64_t        icount;
  40        uint64_t        ifree;
  41        uint64_t        fdblocks;
  42} PACKED;
  43
  44int FAST_FUNC volume_id_probe_xfs(struct volume_id *id /*,uint64_t off*/)
  45{
  46#define off ((uint64_t)0)
  47        struct xfs_super_block *xs;
  48
  49        dbg("probing at offset 0x%llx", (unsigned long long) off);
  50
  51        xs = volume_id_get_buffer(id, off, 0x200);
  52        if (xs == NULL)
  53                return -1;
  54
  55        if (memcmp(xs->magic, "XFSB", 4) != 0)
  56                return -1;
  57
  58//      volume_id_set_label_raw(id, xs->fname, 12);
  59        volume_id_set_label_string(id, xs->fname, 12);
  60        volume_id_set_uuid(id, xs->uuid, UUID_DCE);
  61
  62//      volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
  63        IF_FEATURE_BLKID_TYPE(id->type = "xfs";)
  64
  65        return 0;
  66}
  67