NetBSD/sys/nfs/nfsrvcache.h

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1993-03-21 12:45:37 +03:00
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)nfsrvcache.h 7.3 (Berkeley) 6/28/90
* $Id: nfsrvcache.h,v 1.3 1993/05/20 03:19:12 cgd Exp $
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*/
#ifndef _NFS_NFSRVCACHE_H_
#define _NFS_NFSRVCACHE_H_
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/*
* Definitions for the server recent request cache
*/
#define NFSRVCACHESIZ 128
#define NFSRCHSZ 32
struct nfsrvcache {
struct nfsrvcache *rc_chain[2]; /* Hash chain links */
struct nfsrvcache *rc_next; /* Lru list */
struct nfsrvcache *rc_prev;
int rc_state; /* Current state of request */
int rc_flag; /* Flag bits */
struct mbuf rc_nam; /* Sockaddr of requestor */
u_long rc_xid; /* rpc id number */
int rc_proc; /* rpc proc number */
long rc_timestamp; /* Time stamp */
union {
struct mbuf *rc_repmb; /* Reply mbuf list OR */
int rc_repstat; /* Reply status */
} rc_un;
};
#define rc_forw rc_chain[0]
#define rc_back rc_chain[1]
#define rc_status rc_un.rc_repstat
#define rc_reply rc_un.rc_repmb
#define put_at_head(rp) \
(rp)->rc_prev->rc_next = (rp)->rc_next; \
(rp)->rc_next->rc_prev = (rp)->rc_prev; \
(rp)->rc_next = nfsrvcachehead.rc_next; \
(rp)->rc_next->rc_prev = (rp); \
nfsrvcachehead.rc_next = (rp); \
(rp)->rc_prev = &nfsrvcachehead
/* Cache entry states */
#define RC_UNUSED 0
#define RC_INPROG 1
#define RC_DONE 2
/* Return values */
#define RC_DROPIT 0
#define RC_REPLY 1
#define RC_DOIT 2
/* Flag bits */
#define RC_LOCKED 0x1
#define RC_WANTED 0x2
#define RC_REPSTATUS 0x4
#define RC_REPMBUF 0x8
/* Delay time after completion that request is dropped */
#define RC_DELAY 2 /* seconds */
#endif /* !_NFS_NFSRVCACHE_H_ */