nfsm_subs.h

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    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  * $FreeBSD$
   35  */
   36 
   37 #ifndef _NFS_NFSM_SUBS_H_
   38 #define _NFS_NFSM_SUBS_H_
   39 
   40 /*
   41  * These macros do strange and peculiar things to mbuf chains for
   42  * the assistance of the nfs code. To attempt to use them for any
   43  * other purpose will be dangerous. (they make weird assumptions)
   44  */
   45 
   46 /*
   47  * First define what the actual subs. return
   48  */
   49 #define NFSM_DATAP(m, s)        (m)->m_data += (s)
   50 
   51 /*
   52  * Now for the macros that do the simple stuff and call the functions
   53  * for the hard stuff.
   54  * They use fields in struct nfsrv_descript to handle the mbuf queues.
   55  * Replace most of the macro with an inline function, to minimize
   56  * the machine code. The inline functions in lower case can be called
   57  * directly, bypassing the macro.
   58  */
   59 static __inline void *
   60 nfsm_build(struct nfsrv_descript *nd, int siz)
   61 {
   62         void *retp;
   63         struct mbuf *mb2;
   64 
   65         if ((nd->nd_flag & ND_EXTPG) == 0 &&
   66             siz > M_TRAILINGSPACE(nd->nd_mb)) {
   67                 NFSMCLGET(mb2, M_NOWAIT);
   68                 if (siz > MLEN)
   69                         panic("build > MLEN");
   70                 mb2->m_len = 0;
   71                 nd->nd_bpos = mtod(mb2, char *);
   72                 nd->nd_mb->m_next = mb2;
   73                 nd->nd_mb = mb2;
   74         } else if ((nd->nd_flag & ND_EXTPG) != 0) {
   75                 if (siz > nd->nd_bextpgsiz) {
   76                         mb2 = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
   77                         nd->nd_bpos = (char *)(void *)
   78                             PHYS_TO_DMAP(mb2->m_epg_pa[0]);
   79                         nd->nd_bextpg = 0;
   80                         nd->nd_bextpgsiz = PAGE_SIZE - siz;
   81                         nd->nd_mb->m_next = mb2;
   82                         nd->nd_mb = mb2;
   83                 } else
   84                         nd->nd_bextpgsiz -= siz;
   85                 nd->nd_mb->m_epg_last_len += siz;
   86         }
   87         retp = (void *)(nd->nd_bpos);
   88         nd->nd_mb->m_len += siz;
   89         nd->nd_bpos += siz;
   90         return (retp);
   91 }
   92 
   93 #define NFSM_BUILD(a, c, s)     ((a) = (c)nfsm_build(nd, (s)))
   94 
   95 static __inline void *
   96 nfsm_dissect(struct nfsrv_descript *nd, int siz)
   97 {
   98         int tt1; 
   99         void *retp;
  100 
  101         tt1 = mtod(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 
  102         if (tt1 >= siz) { 
  103                 retp = (void *)nd->nd_dpos; 
  104                 nd->nd_dpos += siz; 
  105         } else { 
  106                 retp = nfsm_dissct(nd, siz, M_WAITOK); 
  107         }
  108         return (retp);
  109 }
  110 
  111 static __inline void *
  112 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
  113 {
  114         int tt1; 
  115         void *retp;
  116 
  117         tt1 = mtod(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 
  118         if (tt1 >= siz) { 
  119                 retp = (void *)nd->nd_dpos; 
  120                 nd->nd_dpos += siz; 
  121         } else { 
  122                 retp = nfsm_dissct(nd, siz, M_NOWAIT); 
  123         }
  124         return (retp);
  125 }
  126 
  127 #define NFSM_DISSECT(a, c, s)                                           \
  128         do {                                                            \
  129                 (a) = (c)nfsm_dissect(nd, (s));                         \
  130                 if ((a) == NULL) {                                      \
  131                         error = EBADRPC;                                \
  132                         goto nfsmout;                                   \
  133                 }                                                       \
  134         } while (0)
  135 
  136 #define NFSM_DISSECT_NONBLOCK(a, c, s)                                  \
  137         do {                                                            \
  138                 (a) = (c)nfsm_dissect_nonblock(nd, (s));                \
  139                 if ((a) == NULL) {                                      \
  140                         error = EBADRPC;                                \
  141                         goto nfsmout;                                   \
  142                 }                                                       \
  143         } while (0)
  144 
  145 #define NFSM_STRSIZ(s, m)                                               \
  146         do {                                                            \
  147                 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED);      \
  148                 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
  149                         error = EBADRPC;                                \
  150                         goto nfsmout;                                   \
  151                 }                                                       \
  152         } while (0)
  153 
  154 #define NFSM_RNDUP(a)   (((a)+3)&(~0x3))
  155 
  156 #endif  /* _NFS_NFSM_SUBS_H_ */

Cache object: 4d29d29403f35b62a285f7038d888ab7

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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