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/nfsserver/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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95
   37  * $FreeBSD: releng/5.0/sys/nfsserver/nfsm_subs.h 106264 2002-10-31 22:35:03Z jeff $
   38  */
   39 
   40 #ifndef _NFSSERVER_NFSM_SUBS_H_
   41 #define _NFSSERVER_NFSM_SUBS_H_
   42 
   43 #include <nfs/nfs_common.h>
   44 
   45 #define nfstov_mode(a)  (fxdr_unsigned(u_int32_t, (a)) & ALLPERMS)
   46 
   47 /*
   48  * These macros do strange and peculiar things to mbuf chains for
   49  * the assistance of the nfs code. To attempt to use them for any
   50  * other purpose will be dangerous. (they make weird assumptions)
   51  */
   52 
   53 /*
   54  * First define what the actual subs. return
   55  */
   56 
   57 #define M_HASCL(m)      ((m)->m_flags & M_EXT)
   58 #define NFSMSIZ(m)      ((M_HASCL(m))?MCLBYTES: \
   59                                 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
   60 
   61 /*
   62  * Now for the macros that do the simple stuff and call the functions
   63  * for the hard stuff.
   64  * These macros use several vars. declared in nfsm_reqhead and these
   65  * vars. must not be used elsewhere unless you are careful not to corrupt
   66  * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
   67  * that may be used so long as the value is not expected to retained
   68  * after a macro.
   69  * I know, this is kind of dorkey, but it makes the actual op functions
   70  * fairly clean and deals with the mess caused by the xdr discriminating
   71  * unions.
   72  */
   73 
   74 
   75 
   76 /* ************************************* */
   77 /* Dissection phase macros */
   78 
   79 int     nfsm_srvstrsiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
   80 int     nfsm_srvnamesiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
   81 int     nfsm_srvmtofh_xx(fhandle_t *f, struct nfsrv_descript *nfsd,
   82             struct mbuf **md, caddr_t *dpos);
   83 int     nfsm_srvsattr_xx(struct vattr *a, struct mbuf **md, caddr_t *dpos);
   84 
   85 #define nfsm_srvstrsiz(s, m) \
   86 do { \
   87         int t1; \
   88         t1 = nfsm_srvstrsiz_xx(&(s), (m), &md, &dpos); \
   89         if (t1) { \
   90                 error = t1; \
   91                 nfsm_reply(0); \
   92         } \
   93 } while (0)
   94 
   95 #define nfsm_srvnamesiz(s) \
   96 do { \
   97         int t1; \
   98         t1 = nfsm_srvnamesiz_xx(&(s), NFS_MAXNAMLEN, &md, &dpos); \
   99         if (t1) { \
  100                 error = t1; \
  101                 nfsm_reply(0); \
  102         } \
  103 } while (0)
  104 
  105 #define nfsm_srvpathsiz(s) \
  106 do { \
  107         int t1; \
  108         t1 = nfsm_srvnamesiz_xx(&(s), NFS_MAXPATHLEN, &md, &dpos); \
  109         if (t1) { \
  110                 error = t1; \
  111                 nfsm_reply(0); \
  112         } \
  113 } while (0)
  114 
  115 #define nfsm_srvmtofh(f) \
  116 do { \
  117         int t1; \
  118         t1 = nfsm_srvmtofh_xx((f), nfsd, &md, &dpos); \
  119         if (t1) { \
  120                 error = t1; \
  121                 nfsm_reply(0); \
  122         } \
  123 } while (0)
  124 
  125 /* XXX why is this different? */
  126 #define nfsm_srvsattr(a) \
  127 do { \
  128         int t1; \
  129         t1 = nfsm_srvsattr_xx((a), &md, &dpos); \
  130         if (t1) { \
  131                 error = t1; \
  132                 m_freem(mrep); \
  133                 mrep = NULL; \
  134                 goto nfsmout; \
  135         } \
  136 } while (0)
  137 
  138 /* ************************************* */
  139 /* Prepare the reply */
  140 
  141 #define nfsm_reply(s) \
  142 do { \
  143         if (mrep != NULL) { \
  144                 m_freem(mrep); \
  145                 mrep = NULL; \
  146         } \
  147         mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
  148         *mrq = mreq; \
  149         if (error == EBADRPC) { \
  150                 error = 0; \
  151                 goto nfsmout; \
  152         } \
  153 } while (0)
  154 
  155 #define nfsm_writereply(s) \
  156 do { \
  157         mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
  158 } while(0)
  159 
  160 /* ************************************* */
  161 /* Reply phase macros - add additional reply info */
  162 
  163 void    nfsm_srvfhtom_xx(fhandle_t *f, int v3, struct mbuf **mb,
  164             caddr_t *bpos);
  165 void    nfsm_srvpostop_fh_xx(fhandle_t *f, struct mbuf **mb, caddr_t *bpos);
  166 void    nfsm_clget_xx(u_int32_t **tl, struct mbuf *mb, struct mbuf **mp,
  167             char **bp, char **be, caddr_t bpos);
  168 
  169 #define nfsm_srvfhtom(f, v3) \
  170         nfsm_srvfhtom_xx((f), (v3), &mb, &bpos)
  171 
  172 #define nfsm_srvpostop_fh(f) \
  173         nfsm_srvpostop_fh_xx((f), &mb, &bpos)
  174 
  175 #define nfsm_srvwcc_data(br, b, ar, a) \
  176         nfsm_srvwcc(nfsd, (br), (b), (ar), (a), &mb, &bpos)
  177 
  178 #define nfsm_srvpostop_attr(r, a) \
  179         nfsm_srvpostopattr(nfsd, (r), (a), &mb, &bpos)
  180 
  181 #define nfsm_srvfillattr(a, f) \
  182         nfsm_srvfattr(nfsd, (a), (f))
  183 
  184 #define nfsm_clget \
  185         nfsm_clget_xx(&tl, mb, &mp, &bp, &be, bpos)
  186 
  187 #endif

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