LXR linux/drivers/staging/lustre/lustre/obdclass/uuid.c

   1/*
   2 * GPL HEADER START
   3 *
   4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 only,
   8 * as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License version 2 for more details (a copy is included
  14 * in the LICENSE file that accompanied this code).
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * version 2 along with this program; If not, see
  18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19 *
  20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21 * CA 95054 USA or visit www.sun.com if you need additional information or
  22 * have any questions.
  23 *
  24 * GPL HEADER END
  25 */
  26/*
  27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28 * Use is subject to license terms.
  29 */
  30/*
  31 * This file is part of Lustre, http://www.lustre.org/
  32 * Lustre is a trademark of Sun Microsystems, Inc.
  33 *
  34 * lustre/obdclass/uuid.c
  35 *
  36 * Public include file for the UUID library
  37 */
  38
  39#define DEBUG_SUBSYSTEM S_CLASS
  40
  41# include <linux/libcfs/libcfs.h>
  42
  43#include <obd_support.h>
  44#include <obd_class.h>
  45
  46
  47static inline __u32 consume(int nob, __u8 **ptr)
  48{
  49        __u32 value;
  50
  51        LASSERT(nob <= sizeof(value));
  52
  53        for (value = 0; nob > 0; --nob)
  54                value = (value << 8) | *((*ptr)++);
  55        return value;
  56}
  57
  58#define CONSUME(val, ptr) (val) = consume(sizeof(val), (ptr))
  59
  60static void uuid_unpack(class_uuid_t in, __u16 *uu, int nr)
  61{
  62        __u8 *ptr = in;
  63
  64        LASSERT(nr * sizeof(*uu) == sizeof(class_uuid_t));
  65
  66        while (nr-- > 0)
  67                CONSUME(uu[nr], &ptr);
  68}
  69
  70void class_uuid_unparse(class_uuid_t uu, struct obd_uuid *out)
  71{
  72        /* uu as an array of __u16's */
  73        __u16 uuid[sizeof(class_uuid_t) / sizeof(__u16)];
  74
  75        CLASSERT(ARRAY_SIZE(uuid) == 8);
  76
  77        uuid_unpack(uu, uuid, ARRAY_SIZE(uuid));
  78        sprintf(out->uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
  79                uuid[0], uuid[1], uuid[2], uuid[3],
  80                uuid[4], uuid[5], uuid[6], uuid[7]);
  81}
  82EXPORT_SYMBOL(class_uuid_unparse);
  83