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nfsrvcache.h revision 1.4 
      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  *	from: @(#)nfsrvcache.h	8.1 (Berkeley) 6/10/93
     37  *	$Id: nfsrvcache.h,v 1.4 1994/06/08 11:37:15 mycroft Exp $
     38  */
     39 
     40 /*
     41  * Definitions for the server recent request cache
     42  */
     43 
     44 #define	NFSRVCACHESIZ	256
     45 
     46 struct nfsrvcache {
     47 	struct	nfsrvcache *rc_forw;		/* Hash chain links */
     48 	struct	nfsrvcache **rc_back;		/* Hash chain links */
     49 	struct	nfsrvcache *rc_next;		/* Lru list */
     50 	struct	nfsrvcache **rc_prev;		/* Lru list */
     51 	u_long	rc_xid;				/* rpc id number */
     52 	union {
     53 		struct mbuf *ru_repmb;		/* Reply mbuf list OR */
     54 		int ru_repstat;			/* Reply status */
     55 	} rc_un;
     56 	union nethostaddr rc_haddr;		/* Host address */
     57 	short	rc_proc;			/* rpc proc number */
     58 	u_char	rc_state;		/* Current state of request */
     59 	u_char	rc_flag;		/* Flag bits */
     60 };
     61 
     62 #define	rc_reply	rc_un.ru_repmb
     63 #define	rc_status	rc_un.ru_repstat
     64 #define	rc_inetaddr	rc_haddr.had_inetaddr
     65 #define	rc_nam		rc_haddr.had_nam
     66 
     67 /* Cache entry states */
     68 #define	RC_UNUSED	0
     69 #define	RC_INPROG	1
     70 #define	RC_DONE		2
     71 
     72 /* Return values */
     73 #define	RC_DROPIT	0
     74 #define	RC_REPLY	1
     75 #define	RC_DOIT		2
     76 #define	RC_CHECKIT	3
     77 
     78 /* Flag bits */
     79 #define	RC_LOCKED	0x01
     80 #define	RC_WANTED	0x02
     81 #define	RC_REPSTATUS	0x04
     82 #define	RC_REPMBUF	0x08
     83 #define	RC_NQNFS	0x10
     84 #define	RC_INETADDR	0x20
     85 #define	RC_NAM		0x40
     86