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/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  * 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  *      @(#)nfsrvcache.h        8.3 (Berkeley) 3/30/95
   33  * $FreeBSD: src/sys/nfsserver/nfsrvcache.h,v 1.16 2004/04/07 04:59:58 imp Exp $
   34  */
   35 
   36 #ifndef _NFSSERVER_NFSRVCACHE_H_
   37 #define _NFSSERVER_NFSRVCACHE_H_
   38 
   39 #include <sys/queue.h>
   40 
   41 /*
   42  * Definitions for the server recent request cache
   43  */
   44 
   45 #define NFSRVCACHESIZ   64
   46 
   47 struct nfsrvcache {
   48         TAILQ_ENTRY(nfsrvcache) rc_lru;         /* LRU chain */
   49         LIST_ENTRY(nfsrvcache) rc_hash;         /* Hash chain */
   50         u_int32_t rc_xid;                       /* rpc id number */
   51         union {
   52                 struct mbuf *ru_repmb;          /* Reply mbuf list OR */
   53                 int ru_repstat;                 /* Reply status */
   54         } rc_un;
   55         union nethostaddr rc_haddr;             /* Host address */
   56         u_int32_t rc_proc;                      /* rpc proc number */
   57         u_char  rc_state;               /* Current state of request */
   58         u_char  rc_flag;                /* Flag bits */
   59 };
   60 
   61 #define rc_reply        rc_un.ru_repmb
   62 #define rc_status       rc_un.ru_repstat
   63 #define rc_inetaddr     rc_haddr.had_inetaddr
   64 #define rc_nam          rc_haddr.had_nam
   65 
   66 /* Cache entry states */
   67 #define RC_UNUSED       0
   68 #define RC_INPROG       1
   69 #define RC_DONE         2
   70 
   71 /* Return values */
   72 #define RC_DROPIT       0
   73 #define RC_REPLY        1
   74 #define RC_DOIT         2
   75 
   76 /* Flag bits */
   77 #define RC_LOCKED       0x01
   78 #define RC_WANTED       0x02
   79 #define RC_REPSTATUS    0x04
   80 #define RC_REPMBUF      0x08
   81 /* free 0x10 */
   82 #define RC_INETADDR     0x20
   83 #define RC_NAM          0x40
   84 
   85 #endif

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