1994-05-24 10:09:53 +00:00
|
|
|
/*
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|
|
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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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*
|
1997-02-10 02:22:35 +00:00
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* @(#)nfs_srvcache.c 8.3 (Berkeley) 3/30/95
|
1994-05-24 10:09:53 +00:00
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|
*/
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2001-09-18 23:32:09 +00:00
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#include <sys/cdefs.h>
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|
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__FBSDID("$FreeBSD$");
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1994-05-24 10:09:53 +00:00
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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>
|
1997-10-12 20:26:33 +00:00
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#include <sys/malloc.h>
|
1994-05-24 10:09:53 +00:00
|
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#include <sys/mount.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
|
1997-08-16 19:16:27 +00:00
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#include <sys/socketvar.h> /* for dup_sockaddr */
|
1994-05-24 10:09:53 +00:00
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#include <netinet/in.h>
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#include <nfs/rpcv2.h>
|
1995-06-27 11:07:30 +00:00
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#include <nfs/nfsproto.h>
|
2001-09-18 23:32:09 +00:00
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#include <nfsserver/nfs.h>
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#include <nfsserver/nfsrvcache.h>
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1994-05-24 10:09:53 +00:00
|
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|
|
1998-02-09 06:11:36 +00:00
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static long numnfsrvcache;
|
1995-12-17 21:14:36 +00:00
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static long desirednfsrvcache = NFSRVCACHESIZ;
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1994-05-24 10:09:53 +00:00
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1994-10-17 17:47:45 +00:00
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#define NFSRCHASH(xid) \
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(&nfsrvhashtbl[((xid) + ((xid) >> 24)) & nfsrvhash])
|
2000-05-26 02:09:24 +00:00
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|
static LIST_HEAD(nfsrvhash, nfsrvcache) *nfsrvhashtbl;
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static TAILQ_HEAD(nfsrvlru, nfsrvcache) nfsrvlruhead;
|
1998-02-09 06:11:36 +00:00
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static u_long nfsrvhash;
|
1994-05-24 10:09:53 +00:00
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#define TRUE 1
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#define FALSE 0
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#define NETFAMILY(rp) \
|
2002-07-15 19:40:23 +00:00
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(((rp)->rc_flag & RC_NAM) ? (rp)->rc_nam->sa_family : AF_INET)
|
1994-05-24 10:09:53 +00:00
|
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|
|
|
|
/*
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|
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* Static array that defines which nfs rpc's are nonidempotent
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|
|
*/
|
1995-12-17 21:14:36 +00:00
|
|
|
static int nonidempotent[NFS_NPROCS] = {
|
1994-05-24 10:09:53 +00:00
|
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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,
|
1995-06-27 11:07:30 +00:00
|
|
|
TRUE,
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|
FALSE,
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|
FALSE,
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|
FALSE,
|
1994-05-24 10:09:53 +00:00
|
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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! */
|
1995-06-27 11:07:30 +00:00
|
|
|
static int nfsv2_repstat[NFS_NPROCS] = {
|
1994-05-24 10:09:53 +00:00
|
|
|
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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|
|
|
/*
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|
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* Initialize the server request cache list
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|
|
*/
|
1994-05-25 09:21:21 +00:00
|
|
|
void
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrv_initcache(void)
|
1994-05-24 10:09:53 +00:00
|
|
|
{
|
|
|
|
|
1994-10-17 17:47:45 +00:00
|
|
|
nfsrvhashtbl = hashinit(desirednfsrvcache, M_NFSD, &nfsrvhash);
|
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|
|
TAILQ_INIT(&nfsrvlruhead);
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
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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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|
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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
|
|
|
|
*/
|
1994-05-25 09:21:21 +00:00
|
|
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int
|
2001-09-28 04:37:08 +00:00
|
|
|
nfsrv_getcache(struct nfsrv_descript *nd, struct mbuf **repp)
|
1994-05-24 10:09:53 +00:00
|
|
|
{
|
2001-09-18 23:32:09 +00:00
|
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struct nfsrvcache *rp;
|
1994-05-24 10:09:53 +00:00
|
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|
struct mbuf *mb;
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|
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struct sockaddr_in *saddr;
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|
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caddr_t bpos;
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|
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int ret;
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|
|
|
1995-06-27 11:07:30 +00:00
|
|
|
/*
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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)
|
1994-05-24 10:09:53 +00:00
|
|
|
return (RC_DOIT);
|
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|
|
loop:
|
2001-09-18 23:32:09 +00:00
|
|
|
LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
|
1994-05-24 10:09:53 +00:00
|
|
|
if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
|
1995-06-27 11:07:30 +00:00
|
|
|
netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
|
1997-05-10 16:12:03 +00:00
|
|
|
NFS_DPF(RC, ("H%03x", rp->rc_xid & 0xfff));
|
1994-05-24 10:09:53 +00:00
|
|
|
if ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
|
|
rp->rc_flag |= RC_WANTED;
|
|
|
|
(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
|
|
|
|
goto loop;
|
|
|
|
}
|
|
|
|
rp->rc_flag |= RC_LOCKED;
|
|
|
|
/* If not at end of LRU chain, move it there */
|
2001-09-18 23:32:09 +00:00
|
|
|
if (TAILQ_NEXT(rp, rc_lru)) {
|
1994-10-17 17:47:45 +00:00
|
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
|
|
|
TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
if (rp->rc_state == RC_UNUSED)
|
|
|
|
panic("nfsrv cache");
|
|
|
|
if (rp->rc_state == RC_INPROG) {
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrvstats.srvcache_inproghits++;
|
1994-05-24 10:09:53 +00:00
|
|
|
ret = RC_DROPIT;
|
|
|
|
} else if (rp->rc_flag & RC_REPSTATUS) {
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrvstats.srvcache_nonidemdonehits++;
|
2001-09-28 04:37:08 +00:00
|
|
|
*repp = nfs_rephead(0, nd, rp->rc_status,
|
|
|
|
&mb, &bpos);
|
1994-05-24 10:09:53 +00:00
|
|
|
ret = RC_REPLY;
|
|
|
|
} else if (rp->rc_flag & RC_REPMBUF) {
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrvstats.srvcache_nonidemdonehits++;
|
1994-05-24 10:09:53 +00:00
|
|
|
*repp = m_copym(rp->rc_reply, 0, M_COPYALL,
|
2003-01-21 08:56:16 +00:00
|
|
|
0);
|
1994-05-24 10:09:53 +00:00
|
|
|
ret = RC_REPLY;
|
|
|
|
} else {
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrvstats.srvcache_idemdonehits++;
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_state = RC_INPROG;
|
|
|
|
ret = RC_DOIT;
|
|
|
|
}
|
|
|
|
rp->rc_flag &= ~RC_LOCKED;
|
|
|
|
if (rp->rc_flag & RC_WANTED) {
|
|
|
|
rp->rc_flag &= ~RC_WANTED;
|
|
|
|
wakeup((caddr_t)rp);
|
|
|
|
}
|
|
|
|
return (ret);
|
|
|
|
}
|
|
|
|
}
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrvstats.srvcache_misses++;
|
1997-05-10 16:12:03 +00:00
|
|
|
NFS_DPF(RC, ("M%03x", nd->nd_retxid & 0xfff));
|
1994-05-24 10:09:53 +00:00
|
|
|
if (numnfsrvcache < desirednfsrvcache) {
|
|
|
|
rp = (struct nfsrvcache *)malloc((u_long)sizeof *rp,
|
2003-01-21 08:56:16 +00:00
|
|
|
M_NFSD, M_ZERO);
|
1994-05-24 10:09:53 +00:00
|
|
|
numnfsrvcache++;
|
|
|
|
rp->rc_flag = RC_LOCKED;
|
|
|
|
} else {
|
2001-09-18 23:32:09 +00:00
|
|
|
rp = TAILQ_FIRST(&nfsrvlruhead);
|
1994-05-24 10:09:53 +00:00
|
|
|
while ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
|
|
rp->rc_flag |= RC_WANTED;
|
|
|
|
(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
|
2001-09-18 23:32:09 +00:00
|
|
|
rp = TAILQ_FIRST(&nfsrvlruhead);
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
rp->rc_flag |= RC_LOCKED;
|
1994-10-17 17:47:45 +00:00
|
|
|
LIST_REMOVE(rp, rc_hash);
|
|
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
1994-05-24 10:09:53 +00:00
|
|
|
if (rp->rc_flag & RC_REPMBUF)
|
|
|
|
m_freem(rp->rc_reply);
|
|
|
|
if (rp->rc_flag & RC_NAM)
|
1997-08-16 19:16:27 +00:00
|
|
|
FREE(rp->rc_nam, M_SONAME);
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_flag &= (RC_LOCKED | RC_WANTED);
|
|
|
|
}
|
1994-10-17 17:47:45 +00:00
|
|
|
TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_state = RC_INPROG;
|
|
|
|
rp->rc_xid = nd->nd_retxid;
|
1997-08-16 19:16:27 +00:00
|
|
|
saddr = (struct sockaddr_in *)nd->nd_nam;
|
1994-05-24 10:09:53 +00:00
|
|
|
switch (saddr->sin_family) {
|
|
|
|
case AF_INET:
|
|
|
|
rp->rc_flag |= RC_INETADDR;
|
|
|
|
rp->rc_inetaddr = saddr->sin_addr.s_addr;
|
|
|
|
break;
|
2002-07-15 19:40:23 +00:00
|
|
|
/* case AF_INET6: */
|
|
|
|
/* case AF_ISO: */
|
1994-05-24 10:09:53 +00:00
|
|
|
default:
|
|
|
|
rp->rc_flag |= RC_NAM;
|
1997-08-16 19:16:27 +00:00
|
|
|
rp->rc_nam = dup_sockaddr(nd->nd_nam, 1);
|
1994-05-24 10:09:53 +00:00
|
|
|
break;
|
|
|
|
};
|
|
|
|
rp->rc_proc = nd->nd_procnum;
|
1994-10-17 17:47:45 +00:00
|
|
|
LIST_INSERT_HEAD(NFSRCHASH(nd->nd_retxid), rp, rc_hash);
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_flag &= ~RC_LOCKED;
|
|
|
|
if (rp->rc_flag & RC_WANTED) {
|
|
|
|
rp->rc_flag &= ~RC_WANTED;
|
|
|
|
wakeup((caddr_t)rp);
|
|
|
|
}
|
|
|
|
return (RC_DOIT);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Update a request cache entry after the rpc has been done
|
|
|
|
*/
|
|
|
|
void
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrv_updatecache(struct nfsrv_descript *nd, int repvalid, struct mbuf *repmbuf)
|
1994-05-24 10:09:53 +00:00
|
|
|
{
|
2001-09-18 23:32:09 +00:00
|
|
|
struct nfsrvcache *rp;
|
1994-05-24 10:09:53 +00:00
|
|
|
|
1995-06-27 11:07:30 +00:00
|
|
|
if (!nd->nd_nam2)
|
1994-05-24 10:09:53 +00:00
|
|
|
return;
|
|
|
|
loop:
|
2001-09-18 23:32:09 +00:00
|
|
|
LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
|
1994-05-24 10:09:53 +00:00
|
|
|
if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
|
1995-06-27 11:07:30 +00:00
|
|
|
netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
|
1997-05-10 16:12:03 +00:00
|
|
|
NFS_DPF(RC, ("U%03x", rp->rc_xid & 0xfff));
|
1994-05-24 10:09:53 +00:00
|
|
|
if ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
|
|
rp->rc_flag |= RC_WANTED;
|
|
|
|
(void) tsleep((caddr_t)rp, PZERO-1, "nfsrc", 0);
|
|
|
|
goto loop;
|
|
|
|
}
|
|
|
|
rp->rc_flag |= RC_LOCKED;
|
1999-12-13 17:07:03 +00:00
|
|
|
if (rp->rc_state == RC_DONE) {
|
|
|
|
/*
|
|
|
|
* This can occur if the cache is too small.
|
2001-09-18 23:32:09 +00:00
|
|
|
* Retransmits of the same request aren't
|
|
|
|
* dropped so we may see the operation
|
1999-12-13 17:07:03 +00:00
|
|
|
* complete more then once.
|
|
|
|
*/
|
|
|
|
if (rp->rc_flag & RC_REPMBUF) {
|
|
|
|
m_freem(rp->rc_reply);
|
|
|
|
rp->rc_flag &= ~RC_REPMBUF;
|
|
|
|
}
|
|
|
|
}
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_state = RC_DONE;
|
|
|
|
/*
|
|
|
|
* If we have a valid reply update status and save
|
|
|
|
* the reply for non-idempotent rpc's.
|
|
|
|
*/
|
|
|
|
if (repvalid && nonidempotent[nd->nd_procnum]) {
|
1995-06-27 11:07:30 +00:00
|
|
|
if ((nd->nd_flag & ND_NFSV3) == 0 &&
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsv2_repstat[
|
|
|
|
nfsrvv2_procid[nd->nd_procnum]]) {
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_status = nd->nd_repstat;
|
|
|
|
rp->rc_flag |= RC_REPSTATUS;
|
|
|
|
} else {
|
|
|
|
rp->rc_reply = m_copym(repmbuf,
|
2003-01-21 08:56:16 +00:00
|
|
|
0, M_COPYALL, 0);
|
1994-05-24 10:09:53 +00:00
|
|
|
rp->rc_flag |= RC_REPMBUF;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
rp->rc_flag &= ~RC_LOCKED;
|
|
|
|
if (rp->rc_flag & RC_WANTED) {
|
|
|
|
rp->rc_flag &= ~RC_WANTED;
|
|
|
|
wakeup((caddr_t)rp);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
1997-05-10 16:12:03 +00:00
|
|
|
NFS_DPF(RC, ("L%03x", nd->nd_retxid & 0xfff));
|
1994-05-24 10:09:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clean out the cache. Called when the last nfsd terminates.
|
|
|
|
*/
|
|
|
|
void
|
2001-09-18 23:32:09 +00:00
|
|
|
nfsrv_cleancache(void)
|
1994-05-24 10:09:53 +00:00
|
|
|
{
|
2001-09-18 23:32:09 +00:00
|
|
|
struct nfsrvcache *rp, *nextrp;
|
1994-05-24 10:09:53 +00:00
|
|
|
|
2001-09-18 23:32:09 +00:00
|
|
|
for (rp = TAILQ_FIRST(&nfsrvlruhead); rp != 0; rp = nextrp) {
|
|
|
|
nextrp = TAILQ_NEXT(rp, rc_lru);
|
1994-10-17 17:47:45 +00:00
|
|
|
LIST_REMOVE(rp, rc_hash);
|
|
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
1999-12-13 17:07:03 +00:00
|
|
|
if (rp->rc_flag & RC_REPMBUF)
|
|
|
|
m_freem(rp->rc_reply);
|
|
|
|
if (rp->rc_flag & RC_NAM)
|
|
|
|
free(rp->rc_nam, M_SONAME);
|
1994-05-24 10:09:53 +00:00
|
|
|
free(rp, M_NFSD);
|
|
|
|
}
|
|
|
|
numnfsrvcache = 0;
|
|
|
|
}
|