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Annotation of kernel/bsd/nfs/nfs_srvcache.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1989, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software contributed to Berkeley by
        !            31:  * Rick Macklem at The University of Guelph.
        !            32:  *
        !            33:  * Redistribution and use in source and binary forms, with or without
        !            34:  * modification, are permitted provided that the following conditions
        !            35:  * are met:
        !            36:  * 1. Redistributions of source code must retain the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer.
        !            38:  * 2. Redistributions in binary form must reproduce the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer in the
        !            40:  *    documentation and/or other materials provided with the distribution.
        !            41:  * 3. All advertising materials mentioning features or use of this software
        !            42:  *    must display the following acknowledgement:
        !            43:  *     This product includes software developed by the University of
        !            44:  *     California, Berkeley and its contributors.
        !            45:  * 4. Neither the name of the University nor the names of its contributors
        !            46:  *    may be used to endorse or promote products derived from this software
        !            47:  *    without specific prior written permission.
        !            48:  *
        !            49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            59:  * SUCH DAMAGE.
        !            60:  *
        !            61:  *     @(#)nfs_srvcache.c      8.3 (Berkeley) 3/30/95
        !            62:  * FreeBSD-Id: nfs_srvcache.c,v 1.15 1997/10/12 20:25:46 phk Exp $
        !            63:  */
        !            64: 
        !            65: #ifndef NFS_NOSERVER 
        !            66: /*
        !            67:  * Reference: Chet Juszczak, "Improving the Performance and Correctness
        !            68:  *             of an NFS Server", in Proc. Winter 1989 USENIX Conference,
        !            69:  *             pages 53-63. San Diego, February 1989.
        !            70:  */
        !            71: #include <sys/param.h>
        !            72: #include <sys/vnode.h>
        !            73: #include <sys/mount.h>
        !            74: #include <sys/kernel.h>
        !            75: #include <sys/systm.h>
        !            76: #include <sys/proc.h>
        !            77: #include <sys/mbuf.h>
        !            78: #include <sys/malloc.h>
        !            79: #include <sys/socket.h>
        !            80: #include <sys/socketvar.h>     /* for dup_sockaddr */
        !            81: 
        !            82: #include <netinet/in.h>
        !            83: #if ISO
        !            84: #include <netiso/iso.h>
        !            85: #endif
        !            86: #include <nfs/rpcv2.h>
        !            87: #include <nfs/nfsproto.h>
        !            88: #include <nfs/nfs.h>
        !            89: #include <nfs/nfsrvcache.h>
        !            90: 
        !            91: extern struct nfsstats nfsstats;
        !            92: extern int nfsv2_procid[NFS_NPROCS];
        !            93: long numnfsrvcache;
        !            94: static long desirednfsrvcache = NFSRVCACHESIZ;
        !            95: 
        !            96: #define        NFSRCHASH(xid) \
        !            97:        (&nfsrvhashtbl[((xid) + ((xid) >> 24)) & nfsrvhash])
        !            98: LIST_HEAD(nfsrvhash, nfsrvcache) *nfsrvhashtbl;
        !            99: TAILQ_HEAD(nfsrvlru, nfsrvcache) nfsrvlruhead;
        !           100: u_long nfsrvhash;
        !           101: 
        !           102: #define TRUE   1
        !           103: #define        FALSE   0
        !           104: 
        !           105: #define        NETFAMILY(rp) \
        !           106:                (((rp)->rc_flag & RC_INETADDR) ? AF_INET : AF_ISO)
        !           107: 
        !           108: /*
        !           109:  * Static array that defines which nfs rpc's are nonidempotent
        !           110:  */
        !           111: static int nonidempotent[NFS_NPROCS] = {
        !           112:        FALSE,
        !           113:        FALSE,
        !           114:        TRUE,
        !           115:        FALSE,
        !           116:        FALSE,
        !           117:        FALSE,
        !           118:        FALSE,
        !           119:        TRUE,
        !           120:        TRUE,
        !           121:        TRUE,
        !           122:        TRUE,
        !           123:        TRUE,
        !           124:        TRUE,
        !           125:        TRUE,
        !           126:        TRUE,
        !           127:        TRUE,
        !           128:        FALSE,
        !           129:        FALSE,
        !           130:        FALSE,
        !           131:        FALSE,
        !           132:        FALSE,
        !           133:        FALSE,
        !           134:        FALSE,
        !           135:        FALSE,
        !           136:        FALSE,
        !           137:        FALSE,
        !           138: };
        !           139: 
        !           140: /* True iff the rpc reply is an nfs status ONLY! */
        !           141: static int nfsv2_repstat[NFS_NPROCS] = {
        !           142:        FALSE,
        !           143:        FALSE,
        !           144:        FALSE,
        !           145:        FALSE,
        !           146:        FALSE,
        !           147:        FALSE,
        !           148:        FALSE,
        !           149:        FALSE,
        !           150:        FALSE,
        !           151:        FALSE,
        !           152:        TRUE,
        !           153:        TRUE,
        !           154:        TRUE,
        !           155:        TRUE,
        !           156:        FALSE,
        !           157:        TRUE,
        !           158:        FALSE,
        !           159:        FALSE,
        !           160: };
        !           161: 
        !           162: /*
        !           163:  * Initialize the server request cache list
        !           164:  */
        !           165: void
        !           166: nfsrv_initcache()
        !           167: {
        !           168: 
        !           169:        nfsrvhashtbl = hashinit(desirednfsrvcache, M_NFSD, &nfsrvhash);
        !           170:        TAILQ_INIT(&nfsrvlruhead);
        !           171: }
        !           172: 
        !           173: /*
        !           174:  * Look for the request in the cache
        !           175:  * If found then
        !           176:  *    return action and optionally reply
        !           177:  * else
        !           178:  *    insert it in the cache
        !           179:  *
        !           180:  * The rules are as follows:
        !           181:  * - if in progress, return DROP request
        !           182:  * - if completed within DELAY of the current time, return DROP it
        !           183:  * - if completed a longer time ago return REPLY if the reply was cached or
        !           184:  *   return DOIT
        !           185:  * Update/add new request at end of lru list
        !           186:  */
        !           187: int
        !           188: nfsrv_getcache(nd, slp, repp)
        !           189:        register struct nfsrv_descript *nd;
        !           190:        struct nfssvc_sock *slp;
        !           191:        struct mbuf **repp;
        !           192: {
        !           193:        register struct nfsrvcache *rp;
        !           194:        struct mbuf *mb;
        !           195:        struct sockaddr_in *saddr;
        !           196:        caddr_t bpos;
        !           197:        int ret;
        !           198: 
        !           199:        /*
        !           200:         * Don't cache recent requests for reliable transport protocols.
        !           201:         * (Maybe we should for the case of a reconnect, but..)
        !           202:         */
        !           203:        if (!nd->nd_nam2)
        !           204:                return (RC_DOIT);
        !           205: loop:
        !           206:        for (rp = NFSRCHASH(nd->nd_retxid)->lh_first; rp != 0;
        !           207:            rp = rp->rc_hash.le_next) {
        !           208:            if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
        !           209:                netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
        !           210:                        NFS_DPF(RC, ("H%03x", rp->rc_xid & 0xfff));
        !           211:                        if ((rp->rc_flag & RC_LOCKED) != 0) {
        !           212:                                rp->rc_flag |= RC_WANTED;
        !           213:                                (void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
        !           214:                                goto loop;
        !           215:                        }
        !           216:                        rp->rc_flag |= RC_LOCKED;
        !           217:                        /* If not at end of LRU chain, move it there */
        !           218:                        if (rp->rc_lru.tqe_next) {
        !           219:                                TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
        !           220:                                TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
        !           221:                        }
        !           222:                        if (rp->rc_state == RC_UNUSED)
        !           223:                                panic("nfsrv cache");
        !           224:                        if (rp->rc_state == RC_INPROG) {
        !           225:                                nfsstats.srvcache_inproghits++;
        !           226:                                ret = RC_DROPIT;
        !           227:                        } else if (rp->rc_flag & RC_REPSTATUS) {
        !           228:                                nfsstats.srvcache_nonidemdonehits++;
        !           229:                                nfs_rephead(0, nd, slp, rp->rc_status,
        !           230:                                   0, (u_quad_t *)0, repp, &mb, &bpos);
        !           231:                                ret = RC_REPLY;
        !           232:                        } else if (rp->rc_flag & RC_REPMBUF) {
        !           233:                                nfsstats.srvcache_nonidemdonehits++;
        !           234:                                *repp = m_copym(rp->rc_reply, 0, M_COPYALL,
        !           235:                                                M_WAIT);
        !           236:                                ret = RC_REPLY;
        !           237:                        } else {
        !           238:                                nfsstats.srvcache_idemdonehits++;
        !           239:                                rp->rc_state = RC_INPROG;
        !           240:                                ret = RC_DOIT;
        !           241:                        }
        !           242:                        rp->rc_flag &= ~RC_LOCKED;
        !           243:                        if (rp->rc_flag & RC_WANTED) {
        !           244:                                rp->rc_flag &= ~RC_WANTED;
        !           245:                                wakeup((caddr_t)rp);
        !           246:                        }
        !           247:                        return (ret);
        !           248:                }
        !           249:        }
        !           250:        nfsstats.srvcache_misses++;
        !           251:        NFS_DPF(RC, ("M%03x", nd->nd_retxid & 0xfff));
        !           252:        if (numnfsrvcache < desirednfsrvcache) {
        !           253:                MALLOC(rp, struct nfsrvcache *, sizeof *rp, M_NFSD, M_WAITOK);
        !           254:                bzero((char *)rp, sizeof *rp);
        !           255:                numnfsrvcache++;
        !           256:                rp->rc_flag = RC_LOCKED;
        !           257:        } else {
        !           258:                rp = nfsrvlruhead.tqh_first;
        !           259:                while ((rp->rc_flag & RC_LOCKED) != 0) {
        !           260:                        rp->rc_flag |= RC_WANTED;
        !           261:                        (void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
        !           262:                        rp = nfsrvlruhead.tqh_first;
        !           263:                }
        !           264:                rp->rc_flag |= RC_LOCKED;
        !           265:                LIST_REMOVE(rp, rc_hash);
        !           266:                TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
        !           267:                if (rp->rc_flag & RC_REPMBUF)
        !           268:                        m_freem(rp->rc_reply);
        !           269:                if (rp->rc_flag & RC_NAM)
        !           270:                        MFREE(rp->rc_nam, mb);
        !           271:                rp->rc_flag &= (RC_LOCKED | RC_WANTED);
        !           272:        }
        !           273:        TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
        !           274:        rp->rc_state = RC_INPROG;
        !           275:        rp->rc_xid = nd->nd_retxid;
        !           276:        saddr = mtod(nd->nd_nam, struct sockaddr_in *);
        !           277:        switch (saddr->sin_family) {
        !           278:        case AF_INET:
        !           279:                rp->rc_flag |= RC_INETADDR;
        !           280:                rp->rc_inetaddr = saddr->sin_addr.s_addr;
        !           281:                break;
        !           282:        case AF_ISO:
        !           283:        default:
        !           284:                rp->rc_flag |= RC_NAM;
        !           285:                rp->rc_nam = m_copym(nd->nd_nam, 0, M_COPYALL, M_WAIT);
        !           286:                break;
        !           287:        };
        !           288:        rp->rc_proc = nd->nd_procnum;
        !           289:        LIST_INSERT_HEAD(NFSRCHASH(nd->nd_retxid), rp, rc_hash);
        !           290:        rp->rc_flag &= ~RC_LOCKED;
        !           291:        if (rp->rc_flag & RC_WANTED) {
        !           292:                rp->rc_flag &= ~RC_WANTED;
        !           293:                wakeup((caddr_t)rp);
        !           294:        }
        !           295:        return (RC_DOIT);
        !           296: }
        !           297: 
        !           298: /*
        !           299:  * Update a request cache entry after the rpc has been done
        !           300:  */
        !           301: void
        !           302: nfsrv_updatecache(nd, repvalid, repmbuf)
        !           303:        register struct nfsrv_descript *nd;
        !           304:        int repvalid;
        !           305:        struct mbuf *repmbuf;
        !           306: {
        !           307:        register struct nfsrvcache *rp;
        !           308: 
        !           309:        if (!nd->nd_nam2)
        !           310:                return;
        !           311: loop:
        !           312:        for (rp = NFSRCHASH(nd->nd_retxid)->lh_first; rp != 0;
        !           313:            rp = rp->rc_hash.le_next) {
        !           314:            if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
        !           315:                netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
        !           316:                        NFS_DPF(RC, ("U%03x", rp->rc_xid & 0xfff));
        !           317:                        if ((rp->rc_flag & RC_LOCKED) != 0) {
        !           318:                                rp->rc_flag |= RC_WANTED;
        !           319:                                (void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
        !           320:                                goto loop;
        !           321:                        }
        !           322:                        rp->rc_flag |= RC_LOCKED;
        !           323:                        rp->rc_state = RC_DONE;
        !           324:                        /*
        !           325:                         * If we have a valid reply update status and save
        !           326:                         * the reply for non-idempotent rpc's.
        !           327:                         */
        !           328:                        if (repvalid && nonidempotent[nd->nd_procnum]) {
        !           329:                                if ((nd->nd_flag & ND_NFSV3) == 0 &&
        !           330:                                  nfsv2_repstat[nfsv2_procid[nd->nd_procnum]]) {
        !           331:                                        rp->rc_status = nd->nd_repstat;
        !           332:                                        rp->rc_flag |= RC_REPSTATUS;
        !           333:                                } else {
        !           334:                                        rp->rc_reply = m_copym(repmbuf,
        !           335:                                                0, M_COPYALL, M_WAIT);
        !           336:                                        rp->rc_flag |= RC_REPMBUF;
        !           337:                                }
        !           338:                        }
        !           339:                        rp->rc_flag &= ~RC_LOCKED;
        !           340:                        if (rp->rc_flag & RC_WANTED) {
        !           341:                                rp->rc_flag &= ~RC_WANTED;
        !           342:                                wakeup((caddr_t)rp);
        !           343:                        }
        !           344:                        return;
        !           345:                }
        !           346:        }
        !           347:        NFS_DPF(RC, ("L%03x", nd->nd_retxid & 0xfff));
        !           348: }
        !           349: 
        !           350: /*
        !           351:  * Clean out the cache. Called when the last nfsd terminates.
        !           352:  */
        !           353: void
        !           354: nfsrv_cleancache()
        !           355: {
        !           356:        register struct nfsrvcache *rp, *nextrp;
        !           357: 
        !           358:        for (rp = nfsrvlruhead.tqh_first; rp != 0; rp = nextrp) {
        !           359:                nextrp = rp->rc_lru.tqe_next;
        !           360:                LIST_REMOVE(rp, rc_hash);
        !           361:                TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
        !           362:                _FREE(rp, M_NFSD);
        !           363:        }
        !           364:        numnfsrvcache = 0;
        !           365: }
        !           366: 
        !           367: #endif /* NFS_NOSERVER */

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