3b1bf8c2e9
Removed dead code that assumed that M_TRYWAIT can return NULL; it's not true since the advent of MBUMA. Reviewed by: arch There are ongoing disputes as to whether we want to switch to directly using UMA flags M_WAITOK/M_NOWAIT for mbuf(9) allocation.
388 lines
10 KiB
C
388 lines
10 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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* @(#)nfs_srvcache.c 8.3 (Berkeley) 3/30/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/malloc.h>
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#include <sys/mount.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h> /* for sodupsockaddr */
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#include <sys/eventhandler.h>
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#include <netinet/in.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfsserver/nfs.h>
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#include <nfsserver/nfsrvcache.h>
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static long numnfsrvcache;
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static long desirednfsrvcache;
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#define NFSRCHASH(xid) \
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(&nfsrvhashtbl[((xid) + ((xid) >> 24)) & nfsrvhash])
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static LIST_HEAD(nfsrvhash, nfsrvcache) *nfsrvhashtbl;
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static TAILQ_HEAD(nfsrvlru, nfsrvcache) nfsrvlruhead;
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static u_long nfsrvhash;
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static eventhandler_tag nfsrv_nmbclusters_tag;
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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_NAM) ? (rp)->rc_nam->sa_family : AF_INET)
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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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static const 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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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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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 const int nfsv2_repstat[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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};
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/*
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* Size the NFS server's duplicate request cache at 1/2 the nmbclsters, floating
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* within a (64, 2048) range. This is to prevent all mbuf clusters being tied up
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* in the NFS dupreq cache for small values of nmbclusters.
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*/
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static void
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nfsrvcache_size_change(void *tag)
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{
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desirednfsrvcache = nmbclusters /2;
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if (desirednfsrvcache > NFSRVCACHE_MAX_SIZE)
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desirednfsrvcache = NFSRVCACHE_MAX_SIZE;
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if (desirednfsrvcache < NFSRVCACHE_MIN_SIZE)
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desirednfsrvcache = NFSRVCACHE_MIN_SIZE;
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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(void)
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{
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nfsrvcache_size_change(NULL);
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nfsrvhashtbl = hashinit(desirednfsrvcache, M_NFSD, &nfsrvhash);
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TAILQ_INIT(&nfsrvlruhead);
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nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
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nfsrvcache_size_change, NULL, EVENTHANDLER_PRI_FIRST);
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}
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/*
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* Teardown the server request cache list
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*/
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void
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nfsrv_destroycache(void)
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{
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KASSERT(TAILQ_EMPTY(&nfsrvlruhead), ("%s: pending requests", __func__));
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EVENTHANDLER_DEREGISTER(nmbclusters_change, nfsrv_nmbclusters_tag);
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hashdestroy(nfsrvhashtbl, M_NFSD, nfsrvhash);
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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(struct nfsrv_descript *nd, struct mbuf **repp)
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{
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struct nfsrvcache *rp;
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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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NFSD_LOCK_ASSERT();
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/*
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* Don't cache recent requests for reliable transport protocols.
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* (Maybe we should for the case of a reconnect, but..)
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*/
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if (!nd->nd_nam2)
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return (RC_DOIT);
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loop:
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LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
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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, nd->nd_nam)) {
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NFS_DPF(RC, ("H%03x", rp->rc_xid & 0xfff));
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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) msleep(rp, &nfsd_mtx, PZERO-1,
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"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 (TAILQ_NEXT(rp, rc_lru)) {
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TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
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TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
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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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nfsrvstats.srvcache_inproghits++;
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ret = RC_DROPIT;
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} else if (rp->rc_flag & RC_REPSTATUS) {
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nfsrvstats.srvcache_nonidemdonehits++;
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NFSD_UNLOCK();
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*repp = nfs_rephead(0, nd, rp->rc_status,
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&mb, &bpos);
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ret = RC_REPLY;
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NFSD_LOCK();
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} else if (rp->rc_flag & RC_REPMBUF) {
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nfsrvstats.srvcache_nonidemdonehits++;
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NFSD_UNLOCK();
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*repp = m_copym(rp->rc_reply, 0, M_COPYALL,
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M_WAIT);
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NFSD_LOCK();
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ret = RC_REPLY;
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} else {
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nfsrvstats.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(rp);
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}
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return (ret);
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}
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}
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nfsrvstats.srvcache_misses++;
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NFS_DPF(RC, ("M%03x", nd->nd_retxid & 0xfff));
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if (numnfsrvcache < desirednfsrvcache) {
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NFSD_UNLOCK();
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rp = (struct nfsrvcache *)malloc((u_long)sizeof *rp,
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M_NFSD, M_WAITOK | M_ZERO);
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NFSD_LOCK();
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numnfsrvcache++;
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rp->rc_flag = RC_LOCKED;
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} else {
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rp = TAILQ_FIRST(&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) msleep(rp, &nfsd_mtx, PZERO-1, "nfsrc", 0);
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rp = TAILQ_FIRST(&nfsrvlruhead);
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}
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rp->rc_flag |= RC_LOCKED;
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LIST_REMOVE(rp, rc_hash);
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TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
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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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FREE(rp->rc_nam, M_SONAME);
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rp->rc_flag &= (RC_LOCKED | RC_WANTED);
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}
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TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
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rp->rc_state = RC_INPROG;
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rp->rc_xid = nd->nd_retxid;
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saddr = (struct sockaddr_in *)nd->nd_nam;
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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_INET6: */
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/* case AF_ISO: */
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default:
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/*
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* XXXRW: Seems like we should only set RC_NAM if we
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* actually manage to set rc_nam to something non-NULL.
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*/
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rp->rc_flag |= RC_NAM;
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rp->rc_nam = sodupsockaddr(nd->nd_nam, M_NOWAIT);
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break;
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};
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rp->rc_proc = nd->nd_procnum;
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LIST_INSERT_HEAD(NFSRCHASH(nd->nd_retxid), rp, rc_hash);
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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(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(struct nfsrv_descript *nd, int repvalid, struct mbuf *repmbuf)
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{
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struct nfsrvcache *rp;
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NFSD_LOCK_ASSERT();
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if (!nd->nd_nam2)
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return;
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loop:
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LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
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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, nd->nd_nam)) {
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NFS_DPF(RC, ("U%03x", rp->rc_xid & 0xfff));
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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) msleep(rp, &nfsd_mtx, PZERO-1,
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"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 (rp->rc_state == RC_DONE) {
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/*
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* This can occur if the cache is too small.
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* Retransmits of the same request aren't
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* dropped so we may see the operation
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* complete more then once.
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*/
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if (rp->rc_flag & RC_REPMBUF) {
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m_freem(rp->rc_reply);
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rp->rc_flag &= ~RC_REPMBUF;
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}
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}
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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 ((nd->nd_flag & ND_NFSV3) == 0 &&
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nfsv2_repstat[
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nfsrvv2_procid[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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NFSD_UNLOCK();
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rp->rc_reply = m_copym(repmbuf,
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0, M_COPYALL, M_WAIT);
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NFSD_LOCK();
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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(rp);
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}
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return;
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}
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}
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NFS_DPF(RC, ("L%03x", nd->nd_retxid & 0xfff));
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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(void)
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{
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struct nfsrvcache *rp, *nextrp;
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NFSD_LOCK_ASSERT();
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TAILQ_FOREACH_SAFE(rp, &nfsrvlruhead, rc_lru, nextrp) {
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LIST_REMOVE(rp, rc_hash);
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TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
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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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free(rp->rc_nam, M_SONAME);
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free(rp, M_NFSD);
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}
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numnfsrvcache = 0;
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}
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