The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfs/xdr_subs.h

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    1 /*      $NetBSD: xdr_subs.h,v 1.15 2005/12/11 12:25:17 christos Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)xdr_subs.h  8.3 (Berkeley) 3/30/95
   35  */
   36 
   37 
   38 #ifndef _NFS_XDR_SUBS_H_
   39 #define _NFS_XDR_SUBS_H_
   40 
   41 /*
   42  * Macros used for conversion to/from xdr representation by nfs...
   43  * These use the MACHINE DEPENDENT routines ntohl, htonl
   44  * As defined by "XDR: External Data Representation Standard" RFC1014
   45  *
   46  * To simplify the implementation, we use ntohl/htonl even on big-endian
   47  * machines, and count on them being `#define'd away.  Some of these
   48  * might be slightly more efficient as quad_t copies on a big-endian,
   49  * but we cannot count on their alignment anyway.
   50  */
   51 
   52 #define fxdr_unsigned(t, v)     ((t)ntohl((int32_t)(v)))
   53 #define txdr_unsigned(v)        (htonl((int32_t)(v)))
   54 
   55 /*
   56  * Directory cookies shouldn't really be XDR-ed, these functions
   57  * are just here to attempt to keep information within 32 bits. And
   58  * make things look better. See nfs_cookieheuristic.
   59  */
   60 #define fxdr_cookie3(v) (((off_t)((v)[0]) << 32) | ((off_t) (v)[1]))
   61 #define fxdr_swapcookie3(v) (((off_t)((v)[1]) << 32) | ((off_t) (v)[0]))
   62 
   63 #define txdr_cookie3(f, v) { \
   64         (v)[1] = (u_int32_t)((f) & 0xffffffffLL); \
   65         (v)[0] = (u_int32_t)((f) >> 32); \
   66 }
   67 #define txdr_swapcookie3(f, v) { \
   68         (v)[0] = (u_int32_t)((f) & 0xffffffffLL); \
   69         (v)[1] = (u_int32_t)((f) >> 32); \
   70 }
   71 
   72 #define fxdr_nfsv2time(f, t) { \
   73         (t)->tv_sec = ntohl(((struct nfsv2_time *)(f))->nfsv2_sec); \
   74         if (((struct nfsv2_time *)(f))->nfsv2_usec != 0xffffffff) \
   75                 (t)->tv_nsec = 1000 * ntohl(((struct nfsv2_time *)(f))->nfsv2_usec); \
   76         else \
   77                 (t)->tv_nsec = 0; \
   78 }
   79 #define txdr_nfsv2time(f, t) { \
   80         ((struct nfsv2_time *)(t))->nfsv2_sec = htonl((f)->tv_sec); \
   81         if ((f)->tv_nsec != -1) \
   82                 ((struct nfsv2_time *)(t))->nfsv2_usec = htonl((f)->tv_nsec / 1000); \
   83         else \
   84                 ((struct nfsv2_time *)(t))->nfsv2_usec = 0xffffffff; \
   85 }
   86 
   87 #define fxdr_nfsv3time(f, t) { \
   88         (t)->tv_sec = ntohl(((struct nfsv3_time *)(f))->nfsv3_sec); \
   89         (t)->tv_nsec = ntohl(((struct nfsv3_time *)(f))->nfsv3_nsec); \
   90 }
   91 #define txdr_nfsv3time(f, t) { \
   92         ((struct nfsv3_time *)(t))->nfsv3_sec = htonl((f)->tv_sec); \
   93         ((struct nfsv3_time *)(t))->nfsv3_nsec = htonl((f)->tv_nsec); \
   94 }
   95 
   96 #define fxdr_hyper(f)                                           \
   97         ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) |     \
   98          (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
   99 
  100 
  101 #define txdr_hyper(f, t) {                                              \
  102         ((u_int32_t *)(t))[0] = htonl((u_int32_t)((f) >> 32));          \
  103         ((u_int32_t *)(t))[1] = htonl((u_int32_t)((f) & 0xffffffff));   \
  104 }
  105 
  106 #endif

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