2eafb39b67
duplicate request cache, under heavy load a lot of non-idempotent requests were getting served again, resulting in errors. Found by : Kris Kennaway.
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfsrvcache.h 8.3 (Berkeley) 3/30/95
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* $FreeBSD$
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*/
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#ifndef _NFSSERVER_NFSRVCACHE_H_
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#define _NFSSERVER_NFSRVCACHE_H_
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#include <sys/queue.h>
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/*
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* Definitions for the server recent request cache
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*/
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#define NFSRVCACHESIZ 2048
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struct nfsrvcache {
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TAILQ_ENTRY(nfsrvcache) rc_lru; /* LRU chain */
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LIST_ENTRY(nfsrvcache) rc_hash; /* Hash chain */
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u_int32_t rc_xid; /* rpc id number */
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union {
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struct mbuf *ru_repmb; /* Reply mbuf list OR */
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int ru_repstat; /* Reply status */
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} rc_un;
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union nethostaddr rc_haddr; /* Host address */
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u_int32_t rc_proc; /* rpc proc number */
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u_char rc_state; /* Current state of request */
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u_char rc_flag; /* Flag bits */
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};
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#define rc_reply rc_un.ru_repmb
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#define rc_status rc_un.ru_repstat
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#define rc_inetaddr rc_haddr.had_inetaddr
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#define rc_nam rc_haddr.had_nam
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/* Cache entry states */
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#define RC_UNUSED 0
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#define RC_INPROG 1
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#define RC_DONE 2
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/* Return values */
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#define RC_DROPIT 0
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#define RC_REPLY 1
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#define RC_DOIT 2
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/* Flag bits */
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#define RC_LOCKED 0x01
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#define RC_WANTED 0x02
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#define RC_REPSTATUS 0x04
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#define RC_REPMBUF 0x08
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/* free 0x10 */
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#define RC_INETADDR 0x20
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#define RC_NAM 0x40
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#endif
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