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fix a race case of nfsrv_getcache.

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This commit is contained in:
yamt 2003-11-20 16:17:25 +00:00
parent 91f5ee90a4
commit 0b47e1b287
1 changed files with 6 additions and 4 deletions
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10
sys/nfs/nfs_srvcache.c
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@ -1,4 +1,4 @@
/* $NetBSD: nfs_srvcache.c,v 1.28 2003/08/07 16:33:52 agc Exp $ */
/* $NetBSD: nfs_srvcache.c,v 1.29 2003/11/20 16:17:25 yamt Exp $ */
/*
* Copyright (c) 1989, 1993
@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_srvcache.c,v 1.28 2003/08/07 16:33:52 agc Exp $");
__KERNEL_RCSID(0, "$NetBSD: nfs_srvcache.c,v 1.29 2003/11/20 16:17:25 yamt Exp $");
#include "opt_iso.h"
@ -223,7 +223,7 @@ nfsrv_getcache(nd, slp, repp)
struct nfssvc_sock *slp;
struct mbuf **repp;
{
struct nfsrvcache *rp;
struct nfsrvcache *rp, *rpdup;
struct mbuf *mb;
struct sockaddr_in *saddr;
caddr_t bpos;
@ -313,12 +313,14 @@ found:
};
rp->rc_proc = nd->nd_procnum;
simple_lock(&nfsrv_reqcache_lock);
if (nfsrv_lookupcache(nd)) {
rpdup = nfsrv_lookupcache(nd);
if (rpdup != NULL) {
/*
* other thread made duplicate cache entry.
*/
simple_unlock(&nfsrv_reqcache_lock);
pool_put(&nfs_reqcache_pool, rp);
rp = rpdup;
goto found;
}
TAILQ_INSERT_TAIL(&nfsrvlruhead, rp, rc_lru);