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      1 /*	$NetBSD: nfsrvcache.h,v 1.17 2024/12/07 02:05:55 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Rick Macklem at The University of Guelph.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)nfsrvcache.h	8.3 (Berkeley) 3/30/95
     35  */
     36 
     37 #ifndef _NFS_NFSRVCACHE_H_
     38 #define _NFS_NFSRVCACHE_H_
     39 
     40 #include <sys/types.h>
     41 
     42 #include <sys/condvar.h>
     43 #include <sys/queue.h>
     44 
     45 #include <nfs/nfs.h>
     46 
     47 /*
     48  * Definitions for the server recent request cache
     49  */
     50 
     51 #define	NFSRVCACHESIZ	64
     52 
     53 struct nfsrvcache {
     54 	kcondvar_t rc_cv;
     55 	TAILQ_ENTRY(nfsrvcache) rc_lru;		/* LRU chain */
     56 	LIST_ENTRY(nfsrvcache) rc_hash;		/* Hash chain */
     57 	u_int32_t	rc_xid;				/* rpc id number */
     58 	union {
     59 		struct mbuf *ru_repmb;		/* Reply mbuf list OR */
     60 		int ru_repstat;			/* Reply status */
     61 	} rc_un;
     62 	union nethostaddr rc_haddr;		/* Host address */
     63 	u_int32_t rc_proc;			/* rpc proc number */
     64 	int rc_state;		/* Current state of request */
     65 	int rc_gflags;		/* Flag bits */
     66 	int rc_flags;		/* Flag bits */
     67 };
     68 
     69 #define	rc_reply	rc_un.ru_repmb
     70 #define	rc_status	rc_un.ru_repstat
     71 #define	rc_inetaddr	rc_haddr.had_inetaddr
     72 #define	rc_nam		rc_haddr.had_nam
     73 
     74 /* Cache entry states */
     75 #define	RC_UNUSED	0
     76 #define	RC_INPROG	1
     77 #define	RC_DONE		2
     78 
     79 /* Return values */
     80 #define	RC_DROPIT	0
     81 #define	RC_REPLY	1
     82 #define	RC_DOIT		2
     83 #define	RC_CHECKIT	3
     84 
     85 /* rc_gflags */
     86 #define	RC_G_LOCKED	0x01
     87 
     88 /* rc_flags */
     89 #define	RC_REPSTATUS	0x04
     90 #define	RC_REPMBUF	0x08
     91 #define	RC_INETADDR	0x20
     92 #define	RC_NAM		0x40
     93 
     94 #endif	/* _NFS_NFSRVCACHE_H_ */
     95