351 lines
8.8 KiB
C
351 lines
8.8 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)nfs_srvcache.c 8.1 (Berkeley) 6/10/93
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*/
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/*
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* Reference: Chet Juszczak, "Improving the Performance and Correctness
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* of an NFS Server", in Proc. Winter 1989 USENIX Conference,
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* pages 53-63. San Diego, February 1989.
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*/
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#include <sys/param.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <netinet/in.h>
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#ifdef ISO
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#include <netiso/iso.h>
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#endif
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#include <nfs/nfsm_subs.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsv2.h>
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#include <nfs/nfs.h>
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#include <nfs/nfsrvcache.h>
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#include <nfs/nqnfs.h>
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long numnfsrvcache, desirednfsrvcache = NFSRVCACHESIZ;
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#define NFSRCHASH(xid) (((xid) + ((xid) >> 24)) & rheadhash)
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static struct nfsrvcache *nfsrvlruhead, **nfsrvlrutail = &nfsrvlruhead;
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static struct nfsrvcache **rheadhtbl;
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static u_long rheadhash;
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#define TRUE 1
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#define FALSE 0
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#define NETFAMILY(rp) \
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(((rp)->rc_flag & RC_INETADDR) ? AF_INET : AF_ISO)
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/*
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* Static array that defines which nfs rpc's are nonidempotent
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*/
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int nonidempotent[NFS_NPROCS] = {
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FALSE,
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FALSE,
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TRUE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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};
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/* True iff the rpc reply is an nfs status ONLY! */
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static int repliesstatus[NFS_NPROCS] = {
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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TRUE,
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TRUE,
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TRUE,
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TRUE,
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FALSE,
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TRUE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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FALSE,
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TRUE,
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};
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/*
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* Initialize the server request cache list
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*/
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void
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nfsrv_initcache()
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{
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rheadhtbl = hashinit(desirednfsrvcache, M_NFSD, &rheadhash);
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}
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/*
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* Look for the request in the cache
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* If found then
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* return action and optionally reply
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* else
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* insert it in the cache
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*
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* The rules are as follows:
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* - if in progress, return DROP request
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* - if completed within DELAY of the current time, return DROP it
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* - if completed a longer time ago return REPLY if the reply was cached or
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* return DOIT
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* Update/add new request at end of lru list
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*/
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int
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nfsrv_getcache(nam, nd, repp)
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struct mbuf *nam;
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register struct nfsd *nd;
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struct mbuf **repp;
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{
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register struct nfsrvcache *rp, *rq, **rpp;
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struct mbuf *mb;
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struct sockaddr_in *saddr;
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caddr_t bpos;
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int ret;
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if (nd->nd_nqlflag != NQL_NOVAL)
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return (RC_DOIT);
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rpp = &rheadhtbl[NFSRCHASH(nd->nd_retxid)];
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loop:
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for (rp = *rpp; rp; rp = rp->rc_forw) {
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if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
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netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nam)) {
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if ((rp->rc_flag & RC_LOCKED) != 0) {
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rp->rc_flag |= RC_WANTED;
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(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
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goto loop;
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}
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rp->rc_flag |= RC_LOCKED;
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/* If not at end of LRU chain, move it there */
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if (rp->rc_next) {
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/* remove from LRU chain */
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*rp->rc_prev = rp->rc_next;
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rp->rc_next->rc_prev = rp->rc_prev;
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/* and replace at end of it */
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rp->rc_next = NULL;
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rp->rc_prev = nfsrvlrutail;
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*nfsrvlrutail = rp;
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nfsrvlrutail = &rp->rc_next;
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}
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if (rp->rc_state == RC_UNUSED)
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panic("nfsrv cache");
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if (rp->rc_state == RC_INPROG) {
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nfsstats.srvcache_inproghits++;
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ret = RC_DROPIT;
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} else if (rp->rc_flag & RC_REPSTATUS) {
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nfsstats.srvcache_nonidemdonehits++;
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nfs_rephead(0, nd, rp->rc_status,
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0, (u_quad_t *)0, repp, &mb, &bpos);
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ret = RC_REPLY;
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} else if (rp->rc_flag & RC_REPMBUF) {
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nfsstats.srvcache_nonidemdonehits++;
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*repp = m_copym(rp->rc_reply, 0, M_COPYALL,
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M_WAIT);
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ret = RC_REPLY;
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} else {
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nfsstats.srvcache_idemdonehits++;
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rp->rc_state = RC_INPROG;
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ret = RC_DOIT;
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}
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rp->rc_flag &= ~RC_LOCKED;
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if (rp->rc_flag & RC_WANTED) {
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rp->rc_flag &= ~RC_WANTED;
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wakeup((caddr_t)rp);
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}
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return (ret);
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}
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}
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nfsstats.srvcache_misses++;
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if (numnfsrvcache < desirednfsrvcache) {
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rp = (struct nfsrvcache *)malloc((u_long)sizeof *rp,
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M_NFSD, M_WAITOK);
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bzero((char *)rp, sizeof *rp);
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numnfsrvcache++;
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rp->rc_flag = RC_LOCKED;
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} else {
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rp = nfsrvlruhead;
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while ((rp->rc_flag & RC_LOCKED) != 0) {
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rp->rc_flag |= RC_WANTED;
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(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
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rp = nfsrvlruhead;
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}
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rp->rc_flag |= RC_LOCKED;
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/* remove from hash chain */
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if (rq = rp->rc_forw)
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rq->rc_back = rp->rc_back;
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*rp->rc_back = rq;
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/* remove from LRU chain */
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*rp->rc_prev = rp->rc_next;
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rp->rc_next->rc_prev = rp->rc_prev;
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if (rp->rc_flag & RC_REPMBUF)
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m_freem(rp->rc_reply);
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if (rp->rc_flag & RC_NAM)
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MFREE(rp->rc_nam, mb);
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rp->rc_flag &= (RC_LOCKED | RC_WANTED);
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}
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/* place at end of LRU list */
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rp->rc_next = NULL;
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rp->rc_prev = nfsrvlrutail;
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*nfsrvlrutail = rp;
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nfsrvlrutail = &rp->rc_next;
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rp->rc_state = RC_INPROG;
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rp->rc_xid = nd->nd_retxid;
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saddr = mtod(nam, struct sockaddr_in *);
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switch (saddr->sin_family) {
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case AF_INET:
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rp->rc_flag |= RC_INETADDR;
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rp->rc_inetaddr = saddr->sin_addr.s_addr;
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break;
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case AF_ISO:
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default:
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rp->rc_flag |= RC_NAM;
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rp->rc_nam = m_copym(nam, 0, M_COPYALL, M_WAIT);
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break;
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};
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rp->rc_proc = nd->nd_procnum;
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/* insert into hash chain */
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if (rq = *rpp)
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rq->rc_back = &rp->rc_forw;
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rp->rc_forw = rq;
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rp->rc_back = rpp;
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*rpp = rp;
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rp->rc_flag &= ~RC_LOCKED;
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if (rp->rc_flag & RC_WANTED) {
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rp->rc_flag &= ~RC_WANTED;
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wakeup((caddr_t)rp);
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}
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return (RC_DOIT);
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}
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/*
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* Update a request cache entry after the rpc has been done
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*/
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void
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nfsrv_updatecache(nam, nd, repvalid, repmbuf)
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struct mbuf *nam;
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register struct nfsd *nd;
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int repvalid;
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struct mbuf *repmbuf;
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{
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register struct nfsrvcache *rp;
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if (nd->nd_nqlflag != NQL_NOVAL)
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return;
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loop:
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for (rp = rheadhtbl[NFSRCHASH(nd->nd_retxid)]; rp; rp = rp->rc_forw) {
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if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
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netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nam)) {
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if ((rp->rc_flag & RC_LOCKED) != 0) {
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rp->rc_flag |= RC_WANTED;
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(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
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goto loop;
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}
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rp->rc_flag |= RC_LOCKED;
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rp->rc_state = RC_DONE;
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/*
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* If we have a valid reply update status and save
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* the reply for non-idempotent rpc's.
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*/
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if (repvalid && nonidempotent[nd->nd_procnum]) {
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if (repliesstatus[nd->nd_procnum]) {
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rp->rc_status = nd->nd_repstat;
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rp->rc_flag |= RC_REPSTATUS;
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} else {
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rp->rc_reply = m_copym(repmbuf,
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0, M_COPYALL, M_WAIT);
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rp->rc_flag |= RC_REPMBUF;
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}
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}
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rp->rc_flag &= ~RC_LOCKED;
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if (rp->rc_flag & RC_WANTED) {
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rp->rc_flag &= ~RC_WANTED;
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wakeup((caddr_t)rp);
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}
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return;
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}
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}
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}
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/*
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* Clean out the cache. Called when the last nfsd terminates.
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*/
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void
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nfsrv_cleancache()
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{
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register struct nfsrvcache *rp, *nextrp;
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for (rp = nfsrvlruhead; rp; rp = nextrp) {
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nextrp = rp->rc_next;
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free(rp, M_NFSD);
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}
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bzero((char *)rheadhtbl, (rheadhash + 1) * sizeof(void *));
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nfsrvlruhead = NULL;
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nfsrvlrutail = &nfsrvlruhead;
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numnfsrvcache = 0;
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}
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