5943f1a781
with low nmbclusters, we tie up too many mbclusters in the NFS duplicate request cache. This change limits the size of the dupreq cache to 1/2 the nmbclusters (and flaots in a range of [64, 2048]). MFC after 2 weeks. Reported by: Steve Kargl, David O'Brien Tested by: Steve Kargl
375 lines
9.8 KiB
C
375 lines
9.8 KiB
C
/*-
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Rick Macklem at The University of Guelph.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)nfs_srvcache.c 8.3 (Berkeley) 3/30/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Reference: Chet Juszczak, "Improving the Performance and Correctness
|
|
* of an NFS Server", in Proc. Winter 1989 USENIX Conference,
|
|
* pages 53-63. San Diego, February 1989.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h> /* for sodupsockaddr */
|
|
#include <sys/eventhandler.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <nfs/rpcv2.h>
|
|
#include <nfs/nfsproto.h>
|
|
#include <nfsserver/nfs.h>
|
|
#include <nfsserver/nfsrvcache.h>
|
|
|
|
static long numnfsrvcache;
|
|
static long desirednfsrvcache;
|
|
|
|
#define NFSRCHASH(xid) \
|
|
(&nfsrvhashtbl[((xid) + ((xid) >> 24)) & nfsrvhash])
|
|
static LIST_HEAD(nfsrvhash, nfsrvcache) *nfsrvhashtbl;
|
|
static TAILQ_HEAD(nfsrvlru, nfsrvcache) nfsrvlruhead;
|
|
static u_long nfsrvhash;
|
|
|
|
#define TRUE 1
|
|
#define FALSE 0
|
|
|
|
#define NETFAMILY(rp) \
|
|
(((rp)->rc_flag & RC_NAM) ? (rp)->rc_nam->sa_family : AF_INET)
|
|
|
|
/*
|
|
* Static array that defines which nfs rpc's are nonidempotent
|
|
*/
|
|
static const int nonidempotent[NFS_NPROCS] = {
|
|
FALSE,
|
|
FALSE,
|
|
TRUE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
};
|
|
|
|
/* True iff the rpc reply is an nfs status ONLY! */
|
|
static const int nfsv2_repstat[NFS_NPROCS] = {
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
FALSE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
TRUE,
|
|
FALSE,
|
|
TRUE,
|
|
FALSE,
|
|
FALSE,
|
|
};
|
|
|
|
/*
|
|
* Size the NFS server's duplicate request cache at 1/2 the nmbclsters, floating
|
|
* within a (64, 2048) range. This is to prevent all mbuf clusters being tied up
|
|
* in the NFS dupreq cache for small values of nmbclusters.
|
|
*/
|
|
static void
|
|
nfsrvcache_size_change(void *tag)
|
|
{
|
|
desirednfsrvcache = nmbclusters /2;
|
|
if (desirednfsrvcache > NFSRVCACHE_MAX_SIZE)
|
|
desirednfsrvcache = NFSRVCACHE_MAX_SIZE;
|
|
if (desirednfsrvcache < NFSRVCACHE_MIN_SIZE)
|
|
desirednfsrvcache = NFSRVCACHE_MIN_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Initialize the server request cache list
|
|
*/
|
|
void
|
|
nfsrv_initcache(void)
|
|
{
|
|
nfsrvcache_size_change(NULL);
|
|
nfsrvhashtbl = hashinit(desirednfsrvcache, M_NFSD, &nfsrvhash);
|
|
TAILQ_INIT(&nfsrvlruhead);
|
|
EVENTHANDLER_REGISTER(nmbclusters_change, nfsrvcache_size_change, NULL,
|
|
EVENTHANDLER_PRI_FIRST);
|
|
}
|
|
|
|
/*
|
|
* Look for the request in the cache
|
|
* If found then
|
|
* return action and optionally reply
|
|
* else
|
|
* insert it in the cache
|
|
*
|
|
* The rules are as follows:
|
|
* - if in progress, return DROP request
|
|
* - if completed within DELAY of the current time, return DROP it
|
|
* - if completed a longer time ago return REPLY if the reply was cached or
|
|
* return DOIT
|
|
* Update/add new request at end of lru list
|
|
*/
|
|
int
|
|
nfsrv_getcache(struct nfsrv_descript *nd, struct mbuf **repp)
|
|
{
|
|
struct nfsrvcache *rp;
|
|
struct mbuf *mb;
|
|
struct sockaddr_in *saddr;
|
|
caddr_t bpos;
|
|
int ret;
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
/*
|
|
* Don't cache recent requests for reliable transport protocols.
|
|
* (Maybe we should for the case of a reconnect, but..)
|
|
*/
|
|
if (!nd->nd_nam2)
|
|
return (RC_DOIT);
|
|
loop:
|
|
LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
|
|
if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
|
|
netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
|
|
NFS_DPF(RC, ("H%03x", rp->rc_xid & 0xfff));
|
|
if ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
rp->rc_flag |= RC_WANTED;
|
|
(void) msleep(rp, &nfsd_mtx, PZERO-1,
|
|
"nfsrc", 0);
|
|
goto loop;
|
|
}
|
|
rp->rc_flag |= RC_LOCKED;
|
|
/* If not at end of LRU chain, move it there */
|
|
if (TAILQ_NEXT(rp, rc_lru)) {
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
|
TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
|
|
}
|
|
if (rp->rc_state == RC_UNUSED)
|
|
panic("nfsrv cache");
|
|
if (rp->rc_state == RC_INPROG) {
|
|
nfsrvstats.srvcache_inproghits++;
|
|
ret = RC_DROPIT;
|
|
} else if (rp->rc_flag & RC_REPSTATUS) {
|
|
nfsrvstats.srvcache_nonidemdonehits++;
|
|
*repp = nfs_rephead(0, nd, rp->rc_status,
|
|
&mb, &bpos);
|
|
ret = RC_REPLY;
|
|
} else if (rp->rc_flag & RC_REPMBUF) {
|
|
nfsrvstats.srvcache_nonidemdonehits++;
|
|
NFSD_UNLOCK();
|
|
*repp = m_copym(rp->rc_reply, 0, M_COPYALL,
|
|
M_TRYWAIT);
|
|
NFSD_LOCK();
|
|
ret = RC_REPLY;
|
|
} else {
|
|
nfsrvstats.srvcache_idemdonehits++;
|
|
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(rp);
|
|
}
|
|
return (ret);
|
|
}
|
|
}
|
|
nfsrvstats.srvcache_misses++;
|
|
NFS_DPF(RC, ("M%03x", nd->nd_retxid & 0xfff));
|
|
if (numnfsrvcache < desirednfsrvcache) {
|
|
NFSD_UNLOCK();
|
|
rp = (struct nfsrvcache *)malloc((u_long)sizeof *rp,
|
|
M_NFSD, M_WAITOK | M_ZERO);
|
|
NFSD_LOCK();
|
|
numnfsrvcache++;
|
|
rp->rc_flag = RC_LOCKED;
|
|
} else {
|
|
rp = TAILQ_FIRST(&nfsrvlruhead);
|
|
while ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
rp->rc_flag |= RC_WANTED;
|
|
(void) msleep(rp, &nfsd_mtx, PZERO-1, "nfsrc", 0);
|
|
rp = TAILQ_FIRST(&nfsrvlruhead);
|
|
}
|
|
rp->rc_flag |= RC_LOCKED;
|
|
LIST_REMOVE(rp, rc_hash);
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
|
if (rp->rc_flag & RC_REPMBUF)
|
|
m_freem(rp->rc_reply);
|
|
if (rp->rc_flag & RC_NAM)
|
|
FREE(rp->rc_nam, M_SONAME);
|
|
rp->rc_flag &= (RC_LOCKED | RC_WANTED);
|
|
}
|
|
TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);
|
|
rp->rc_state = RC_INPROG;
|
|
rp->rc_xid = nd->nd_retxid;
|
|
saddr = (struct sockaddr_in *)nd->nd_nam;
|
|
switch (saddr->sin_family) {
|
|
case AF_INET:
|
|
rp->rc_flag |= RC_INETADDR;
|
|
rp->rc_inetaddr = saddr->sin_addr.s_addr;
|
|
break;
|
|
/* case AF_INET6: */
|
|
/* case AF_ISO: */
|
|
default:
|
|
/*
|
|
* XXXRW: Seems like we should only set RC_NAM if we
|
|
* actually manage to set rc_nam to something non-NULL.
|
|
*/
|
|
rp->rc_flag |= RC_NAM;
|
|
rp->rc_nam = sodupsockaddr(nd->nd_nam, M_NOWAIT);
|
|
break;
|
|
};
|
|
rp->rc_proc = nd->nd_procnum;
|
|
LIST_INSERT_HEAD(NFSRCHASH(nd->nd_retxid), rp, rc_hash);
|
|
rp->rc_flag &= ~RC_LOCKED;
|
|
if (rp->rc_flag & RC_WANTED) {
|
|
rp->rc_flag &= ~RC_WANTED;
|
|
wakeup(rp);
|
|
}
|
|
return (RC_DOIT);
|
|
}
|
|
|
|
/*
|
|
* Update a request cache entry after the rpc has been done
|
|
*/
|
|
void
|
|
nfsrv_updatecache(struct nfsrv_descript *nd, int repvalid, struct mbuf *repmbuf)
|
|
{
|
|
struct nfsrvcache *rp;
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (!nd->nd_nam2)
|
|
return;
|
|
loop:
|
|
LIST_FOREACH(rp, NFSRCHASH(nd->nd_retxid), rc_hash) {
|
|
if (nd->nd_retxid == rp->rc_xid && nd->nd_procnum == rp->rc_proc &&
|
|
netaddr_match(NETFAMILY(rp), &rp->rc_haddr, nd->nd_nam)) {
|
|
NFS_DPF(RC, ("U%03x", rp->rc_xid & 0xfff));
|
|
if ((rp->rc_flag & RC_LOCKED) != 0) {
|
|
rp->rc_flag |= RC_WANTED;
|
|
(void) msleep(rp, &nfsd_mtx, PZERO-1,
|
|
"nfsrc", 0);
|
|
goto loop;
|
|
}
|
|
rp->rc_flag |= RC_LOCKED;
|
|
if (rp->rc_state == RC_DONE) {
|
|
/*
|
|
* This can occur if the cache is too small.
|
|
* Retransmits of the same request aren't
|
|
* dropped so we may see the operation
|
|
* complete more then once.
|
|
*/
|
|
if (rp->rc_flag & RC_REPMBUF) {
|
|
m_freem(rp->rc_reply);
|
|
rp->rc_flag &= ~RC_REPMBUF;
|
|
}
|
|
}
|
|
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]) {
|
|
if ((nd->nd_flag & ND_NFSV3) == 0 &&
|
|
nfsv2_repstat[
|
|
nfsrvv2_procid[nd->nd_procnum]]) {
|
|
rp->rc_status = nd->nd_repstat;
|
|
rp->rc_flag |= RC_REPSTATUS;
|
|
} else {
|
|
NFSD_UNLOCK();
|
|
rp->rc_reply = m_copym(repmbuf,
|
|
0, M_COPYALL, M_TRYWAIT);
|
|
NFSD_LOCK();
|
|
rp->rc_flag |= RC_REPMBUF;
|
|
}
|
|
}
|
|
rp->rc_flag &= ~RC_LOCKED;
|
|
if (rp->rc_flag & RC_WANTED) {
|
|
rp->rc_flag &= ~RC_WANTED;
|
|
wakeup(rp);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
NFS_DPF(RC, ("L%03x", nd->nd_retxid & 0xfff));
|
|
}
|
|
|
|
/*
|
|
* Clean out the cache. Called when the last nfsd terminates.
|
|
*/
|
|
void
|
|
nfsrv_cleancache(void)
|
|
{
|
|
struct nfsrvcache *rp, *nextrp;
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
for (rp = TAILQ_FIRST(&nfsrvlruhead); rp != 0; rp = nextrp) {
|
|
nextrp = TAILQ_NEXT(rp, rc_lru);
|
|
LIST_REMOVE(rp, rc_hash);
|
|
TAILQ_REMOVE(&nfsrvlruhead, rp, rc_lru);
|
|
if (rp->rc_flag & RC_REPMBUF)
|
|
m_freem(rp->rc_reply);
|
|
if (rp->rc_flag & RC_NAM)
|
|
free(rp->rc_nam, M_SONAME);
|
|
free(rp, M_NFSD);
|
|
}
|
|
numnfsrvcache = 0;
|
|
}
|