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freebsd/sys/nfsserver/nfsrvcache.h
Mohan Srinivasan 5943f1a781 Size the NFS server dupreq cache on the basis of nmbclusters. On servers
with low nmbclusters, we tie up too many mbclusters in the NFS duplicate
request cache. This change limits the size of the dupreq cache to 1/2
the nmbclusters (and flaots in a range of [64, 2048]).

MFC after 2 weeks.

Reported by: Steve Kargl, David O'Brien
Tested by:   Steve Kargl
2006-06-23 00:42:26 +00:00

86 lines
2.9 KiB
C

/*-
* Copyright (c) 1989, 1993
* 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.
* 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.
*
* @(#)nfsrvcache.h 8.3 (Berkeley) 3/30/95
* $FreeBSD$
*/
#ifndef _NFSSERVER_NFSRVCACHE_H_
#define _NFSSERVER_NFSRVCACHE_H_
#include <sys/queue.h>
/*
* Definitions for the server recent request cache
*/
#define NFSRVCACHE_MAX_SIZE 2048
#define NFSRVCACHE_MIN_SIZE 64
struct nfsrvcache {
TAILQ_ENTRY(nfsrvcache) rc_lru; /* LRU chain */
LIST_ENTRY(nfsrvcache) rc_hash; /* Hash chain */
u_int32_t rc_xid; /* rpc id number */
union {
struct mbuf *ru_repmb; /* Reply mbuf list OR */
int ru_repstat; /* Reply status */
} rc_un;
union nethostaddr rc_haddr; /* Host address */
u_int32_t rc_proc; /* rpc proc number */
u_char rc_state; /* Current state of request */
u_char rc_flag; /* Flag bits */
};
#define rc_reply rc_un.ru_repmb
#define rc_status rc_un.ru_repstat
#define rc_inetaddr rc_haddr.had_inetaddr
#define rc_nam rc_haddr.had_nam
/* 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 0x01
#define RC_WANTED 0x02
#define RC_REPSTATUS 0x04
#define RC_REPMBUF 0x08
/* free 0x10 */
#define RC_INETADDR 0x20
#define RC_NAM 0x40
#endif