nfsm_subs.h

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _NFS_NFSM_SUBS_H_
   36 #define _NFS_NFSM_SUBS_H_
   37 
   38 
   39 /*
   40  * These macros do strange and peculiar things to mbuf chains for
   41  * the assistance of the nfs code. To attempt to use them for any
   42  * other purpose will be dangerous. (they make weird assumptions)
   43  */
   44 
   45 #ifndef APPLE
   46 /*
   47  * First define what the actual subs. return
   48  */
   49 #define M_HASCL(m)      ((m)->m_flags & M_EXT)
   50 #define NFSMINOFF(m)                                                    \
   51                 if (M_HASCL(m))                                         \
   52                         (m)->m_data = (m)->m_ext.ext_buf;               \
   53                 else if ((m)->m_flags & M_PKTHDR)                       \
   54                         (m)->m_data = (m)->m_pktdat;                    \
   55                                 else                                    \
   56                         (m)->m_data = (m)->m_dat
   57 #define NFSMSIZ(m)      ((M_HASCL(m))?MCLBYTES:                         \
   58                                 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
   59 #define NFSM_DATAP(m, s)        (m)->m_data += (s)
   60 
   61 /*
   62  * Now for the macros that do the simple stuff and call the functions
   63  * for the hard stuff.
   64  * They use fields in struct nfsrv_descript to handle the mbuf queues.
   65  * Replace most of the macro with an inline function, to minimize
   66  * the machine code. The inline functions in lower case can be called
   67  * directly, bypassing the macro.
   68  */
   69 static __inline void *
   70 nfsm_build(struct nfsrv_descript *nd, int siz)
   71 {
   72         void *retp;
   73         struct mbuf *mb2;
   74 
   75         if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
   76                 NFSMCLGET(mb2, M_DONTWAIT);
   77                 if (siz > MLEN)
   78                         panic("build > MLEN");
   79                 mbuf_setlen(mb2, 0);
   80                 nd->nd_bpos = NFSMTOD(mb2, caddr_t);
   81                 nd->nd_mb->m_next = mb2;
   82                 nd->nd_mb = mb2;
   83         }
   84         retp = (void *)(nd->nd_bpos);
   85         nd->nd_mb->m_len += siz;
   86         nd->nd_bpos += siz;
   87         return (retp);
   88 }
   89 
   90 #define NFSM_BUILD(a, c, s)     ((a) = (c)nfsm_build(nd, (s)))
   91 
   92 static __inline void *
   93 nfsm_dissect(struct nfsrv_descript *nd, int siz)
   94 {
   95         int tt1; 
   96         void *retp;
   97 
   98         tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 
   99         if (tt1 >= siz) { 
  100                 retp = (void *)nd->nd_dpos; 
  101                 nd->nd_dpos += siz; 
  102         } else { 
  103                 retp = nfsm_dissct(nd, siz, M_WAITOK); 
  104         }
  105         return (retp);
  106 }
  107 
  108 static __inline void *
  109 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
  110 {
  111         int tt1; 
  112         void *retp;
  113 
  114         tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 
  115         if (tt1 >= siz) { 
  116                 retp = (void *)nd->nd_dpos; 
  117                 nd->nd_dpos += siz; 
  118         } else { 
  119                 retp = nfsm_dissct(nd, siz, M_NOWAIT); 
  120         }
  121         return (retp);
  122 }
  123 
  124 #define NFSM_DISSECT(a, c, s)                                           \
  125         do {                                                            \
  126                 (a) = (c)nfsm_dissect(nd, (s));                         \
  127                 if ((a) == NULL) {                                      \
  128                         error = EBADRPC;                                \
  129                         goto nfsmout;                                   \
  130                 }                                                       \
  131         } while (0)
  132 
  133 #define NFSM_DISSECT_NONBLOCK(a, c, s)                                  \
  134         do {                                                            \
  135                 (a) = (c)nfsm_dissect_nonblock(nd, (s));                \
  136                 if ((a) == NULL) {                                      \
  137                         error = EBADRPC;                                \
  138                         goto nfsmout;                                   \
  139                 }                                                       \
  140         } while (0)
  141 #endif  /* !APPLE */
  142 
  143 #define NFSM_STRSIZ(s, m)                                               \
  144         do {                                                            \
  145                 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED);      \
  146                 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
  147                         error = EBADRPC;                                \
  148                         goto nfsmout;                                   \
  149                 }                                                       \
  150         } while (0)
  151 
  152 #define NFSM_RNDUP(a)   (((a)+3)&(~0x3))
  153 
  154 #endif  /* _NFS_NFSM_SUBS_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/fs/nfs/nfsm_subs.h

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/nfsm_subs.h