FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfsm_subs.h

     /*-
      * Copyright (c) 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95
     * $FreeBSD: releng/10.0/sys/nfsserver/nfsm_subs.h 184588 2008-11-03 10:38:00Z dfr $
     */
    
    #ifndef _NFSSERVER_NFSM_SUBS_H_
    #define _NFSSERVER_NFSM_SUBS_H_
    
    #include <nfs/nfs_common.h>
    
    #define nfstov_mode(a)  (fxdr_unsigned(u_int32_t, (a)) & ALLPERMS)
    
    /*
     * These macros do strange and peculiar things to mbuf chains for
     * the assistance of the nfs code. To attempt to use them for any
     * other purpose will be dangerous. (they make weird assumptions)
     */
    
    /*
     * First define what the actual subs. return
     */
    
    #define M_HASCL(m)      ((m)->m_flags & M_EXT)
    #define NFSMSIZ(m)      ((M_HASCL(m))?MCLBYTES: \
                                    (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))
    
    /*
     * Now for the macros that do the simple stuff and call the functions
     * for the hard stuff.
     * These macros use several vars. declared in nfsm_reqhead and these
     * vars. must not be used elsewhere unless you are careful not to corrupt
     * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
     * that may be used so long as the value is not expected to retained
     * after a macro.
     * I know, this is kind of dorkey, but it makes the actual op functions
     * fairly clean and deals with the mess caused by the xdr discriminating
     * unions.
     */
    
    
    
    /* ************************************* */
    /* Dissection phase macros */
    
    int     nfsm_srvstrsiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
    int     nfsm_srvnamesiz_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
    int     nfsm_srvnamesiz0_xx(int *s, int m, struct mbuf **md, caddr_t *dpos);
    int     nfsm_srvmtofh_xx(fhandle_t *f, int v3, struct mbuf **md, caddr_t *dpos);
    int     nfsm_srvsattr_xx(struct vattr *a, struct mbuf **md, caddr_t *dpos);
    
    #define nfsm_srvstrsiz(s, m) \
    do { \
            int t1; \
            t1 = nfsm_srvstrsiz_xx(&(s), (m), &md, &dpos); \
            if (t1) { \
                    error = t1; \
                    nfsm_reply(0); \
            } \
    } while (0)
    
    #define nfsm_srvnamesiz(s) \
    do { \
            int t1; \
            t1 = nfsm_srvnamesiz_xx(&(s), NFS_MAXNAMLEN, &md, &dpos); \
            if (t1) { \
                    error = t1; \
                    nfsm_reply(0); \
            } \
    } while (0)
   
   #define nfsm_srvpathsiz(s) \
   do { \
           int t1; \
           t1 = nfsm_srvnamesiz0_xx(&(s), NFS_MAXPATHLEN, &md, &dpos); \
           if (t1) { \
                   error = t1; \
                   nfsm_reply(0); \
           } \
   } while (0)
   
   #define nfsm_srvmtofh(f) \
   do { \
           int t1; \
           t1 = nfsm_srvmtofh_xx((f), nfsd->nd_flag & ND_NFSV3, &md, &dpos); \
           if (t1) { \
                   error = t1; \
                   nfsm_reply(0); \
           } \
   } while (0)
   
   /* XXX why is this different? */
   #define nfsm_srvsattr(a) \
   do { \
           int t1; \
           t1 = nfsm_srvsattr_xx((a), &md, &dpos); \
           if (t1) { \
                   error = t1; \
                   m_freem(mrep); \
                   mrep = NULL; \
                   goto nfsmout; \
           } \
   } while (0)
   
   /* ************************************* */
   /* Prepare the reply */
   
   #define nfsm_reply(s) \
   do { \
           if (mrep != NULL) { \
                   m_freem(mrep); \
                   mrep = NULL; \
           } \
           mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
           *mrq = mreq; \
           if (error == EBADRPC) { \
                   error = 0; \
                   goto nfsmout; \
           } \
   } while (0)
   
   #define nfsm_writereply(s) \
   do { \
           mreq = nfs_rephead((s), nfsd, error, &mb, &bpos); \
   } while(0)
   
   /* ************************************* */
   /* Reply phase macros - add additional reply info */
   
   void    nfsm_srvfhtom_xx(fhandle_t *f, int v3, struct mbuf **mb,
               caddr_t *bpos);
   void    nfsm_srvpostop_fh_xx(fhandle_t *f, struct mbuf **mb, caddr_t *bpos);
   void    nfsm_clget_xx(u_int32_t **tl, struct mbuf *mb, struct mbuf **mp,
               char **bp, char **be, caddr_t bpos);
   
   #define nfsm_srvfhtom(f, v3) \
           nfsm_srvfhtom_xx((f), (v3), &mb, &bpos)
   
   #define nfsm_srvpostop_fh(f) \
           nfsm_srvpostop_fh_xx((f), &mb, &bpos)
   
   #define nfsm_srvwcc_data(br, b, ar, a) \
           nfsm_srvwcc(nfsd, (br), (b), (ar), (a), &mb, &bpos)
   
   #define nfsm_srvpostop_attr(r, a) \
           nfsm_srvpostopattr(nfsd, (r), (a), &mb, &bpos)
   
   #define nfsm_srvfillattr(a, f) \
           nfsm_srvfattr(nfsd, (a), (f))
   
   #define nfsm_clget \
           nfsm_clget_xx(&tl, mb, &mp, &bp, &be, bpos)
   
   #endif

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