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nfsrvcache.h revision 1.1 
      1 /*
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * 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	7.3 (Berkeley) 6/28/90
     37  */
     38 
     39 /*
     40  * Definitions for the server recent request cache
     41  */
     42 
     43 #define	NFSRVCACHESIZ	128
     44 #define	NFSRCHSZ	32
     45 
     46 struct nfsrvcache {
     47 	struct	nfsrvcache *rc_chain[2];	/* Hash chain links */
     48 	struct	nfsrvcache *rc_next;	/* Lru list */
     49 	struct	nfsrvcache *rc_prev;
     50 	int	rc_state;		/* Current state of request */
     51 	int	rc_flag;		/* Flag bits */
     52 	struct	mbuf rc_nam;		/* Sockaddr of requestor */
     53 	u_long	rc_xid;			/* rpc id number */
     54 	int	rc_proc;		/* rpc proc number */
     55 	long	rc_timestamp;		/* Time stamp */
     56 	union {
     57 		struct mbuf *rc_repmb;	/* Reply mbuf list OR */
     58 		int rc_repstat;		/* Reply status */
     59 	} rc_un;
     60 };
     61 
     62 #define	rc_forw		rc_chain[0]
     63 #define	rc_back		rc_chain[1]
     64 #define	rc_status	rc_un.rc_repstat
     65 #define	rc_reply	rc_un.rc_repmb
     66 
     67 #define	put_at_head(rp) \
     68 		(rp)->rc_prev->rc_next = (rp)->rc_next; \
     69 		(rp)->rc_next->rc_prev = (rp)->rc_prev; \
     70 		(rp)->rc_next = nfsrvcachehead.rc_next; \
     71 		(rp)->rc_next->rc_prev = (rp); \
     72 		nfsrvcachehead.rc_next = (rp); \
     73 		(rp)->rc_prev = &nfsrvcachehead
     74 
     75 /* Cache entry states */
     76 #define	RC_UNUSED	0
     77 #define	RC_INPROG	1
     78 #define	RC_DONE		2
     79 
     80 /* Return values */
     81 #define	RC_DROPIT	0
     82 #define	RC_REPLY	1
     83 #define	RC_DOIT		2
     84 
     85 /* Flag bits */
     86 #define	RC_LOCKED	0x1
     87 #define	RC_WANTED	0x2
     88 #define	RC_REPSTATUS	0x4
     89 #define	RC_REPMBUF	0x8
     90 
     91 /* Delay time after completion that request is dropped */
     92 #define	RC_DELAY	2		/* seconds */
     93 
     94