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/nfsrvcache.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  *      @(#)nfsrvcache.h        8.1 (Berkeley) 6/10/93
   37  * $FreeBSD: src/sys/nfs/nfsrvcache.h,v 1.5.4.1 1999/09/05 08:19:53 peter Exp $
   38  */
   39 
   40 #ifndef _NFS_NFSRVCACHE_H_
   41 #define _NFS_NFSRVCACHE_H_
   42 
   43 /*
   44  * Definitions for the server recent request cache
   45  */
   46 
   47 #define NFSRVCACHESIZ   64
   48 
   49 struct nfsrvcache {
   50         TAILQ_ENTRY(nfsrvcache) rc_lru;         /* LRU chain */
   51         LIST_ENTRY(nfsrvcache) rc_hash;         /* Hash chain */
   52         u_long  rc_xid;                         /* rpc id number */
   53         union {
   54                 struct mbuf *ru_repmb;          /* Reply mbuf list OR */
   55                 int ru_repstat;                 /* Reply status */
   56         } rc_un;
   57         union nethostaddr rc_haddr;             /* Host address */
   58         short   rc_proc;                        /* rpc proc number */
   59         u_char  rc_state;               /* Current state of request */
   60         u_char  rc_flag;                /* Flag bits */
   61 };
   62 
   63 #define rc_reply        rc_un.ru_repmb
   64 #define rc_status       rc_un.ru_repstat
   65 #define rc_inetaddr     rc_haddr.had_inetaddr
   66 #define rc_nam          rc_haddr.had_nam
   67 
   68 /* Cache entry states */
   69 #define RC_UNUSED       0
   70 #define RC_INPROG       1
   71 #define RC_DONE         2
   72 
   73 /* Return values */
   74 #define RC_DROPIT       0
   75 #define RC_REPLY        1
   76 #define RC_DOIT         2
   77 #define RC_CHECKIT      3
   78 
   79 /* Flag bits */
   80 #define RC_LOCKED       0x01
   81 #define RC_WANTED       0x02
   82 #define RC_REPSTATUS    0x04
   83 #define RC_REPMBUF      0x08
   84 #define RC_NQNFS        0x10
   85 #define RC_INETADDR     0x20
   86 #define RC_NAM          0x40
   87 
   88 #endif

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