When a stale file handle is encountered, purge all cached information about

an NFS node including the access and attribute caches.  Previously the NFS
client only purged any name cache entries associated with the file.

PR:		kern/123755
Submitted by:	Jaakko Heinonen  jh of saunalahti fi
Reported by:	Timo Sirainen  tss of iki fi
Reviewed by:	rwatson, rmacklem
MFC after:	1 month

5 files changed, 27 insertions, 3 deletions

diff --git a/sys/nfs4client/nfs4_socket.c b/sys/nfs4client/nfs4_socket.c
index 754ba47..c1fe154 100644
--- a/sys/nfs4client/nfs4_socket.c
+++ b/sys/nfs4client/nfs4_socket.c
@@ -259,7 +259,7 @@ nfs4_request(struct vnode *vp, struct mbuf *mrest, int procnum,
 	 ** lookup cache, just in case.
 	 **/
 	if (error == ESTALE)
-		cache_purge(vp);
+		nfs_purgecache(vp);
 
 	return (error);
 }
diff --git a/sys/nfsclient/nfs.h b/sys/nfsclient/nfs.h
index df93952..4dce2fe 100644
--- a/sys/nfsclient/nfs.h
+++ b/sys/nfsclient/nfs.h
@@ -322,6 +322,7 @@ void	nfs_down(struct nfsreq *, struct nfsmount *, struct thread *,
 #endif /* ! NFS4_USE_RPCCLNT */
 #endif
 
+void	nfs_purgecache(struct vnode *);
 int	nfs_vinvalbuf(struct vnode *, int, struct thread *, int);
 int	nfs_readrpc(struct vnode *, struct uio *, struct ucred *);
 int	nfs_writerpc(struct vnode *, struct uio *, struct ucred *, int *,
diff --git a/sys/nfsclient/nfs_krpc.c b/sys/nfsclient/nfs_krpc.c
index 8f3f124..767dc0f 100644
--- a/sys/nfsclient/nfs_krpc.c
+++ b/sys/nfsclient/nfs_krpc.c
@@ -557,7 +557,7 @@ tryagain:
 		 * cache, just in case.
 		 */
 		if (error == ESTALE)
-			cache_purge(vp);
+			nfs_purgecache(vp);
 		/*
 		 * Skip wcc data on NFS errors for now. NetApp filers
 		 * return corrupt postop attrs in the wcc data for NFS
diff --git a/sys/nfsclient/nfs_socket.c b/sys/nfsclient/nfs_socket.c
index a61962f..8057604 100644
--- a/sys/nfsclient/nfs_socket.c
+++ b/sys/nfsclient/nfs_socket.c
@@ -1364,7 +1364,7 @@ wait_for_pinned_req:
 			 * lookup cache, just in case.
 			 */
 			if (error == ESTALE)
-				cache_purge(vp);
+				nfs_purgecache(vp);
 			/*
 			 * Skip wcc data on NFS errors for now. NetApp filers return corrupt
 			 * postop attrs in the wcc data for NFS err EROFS. Not sure if they 
diff --git a/sys/nfsclient/nfs_subs.c b/sys/nfsclient/nfs_subs.c
index e9b7f35..1453dbf 100644
--- a/sys/nfsclient/nfs_subs.c
+++ b/sys/nfsclient/nfs_subs.c
@@ -865,6 +865,29 @@ nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
 	return (0);
 }
 
+/*
+ * Purge all cached information about an NFS vnode including name
+ * cache entries, the attribute cache, and the access cache.  This is
+ * called when an NFS request for a node fails with a stale
+ * filehandle.
+ */
+void
+nfs_purgecache(struct vnode *vp)
+{
+	struct nfsnode *np;
+	int i;
+
+	np = VTONFS(vp);
+	cache_purge(vp);
+	mtx_lock(&np->n_mtx);
+	np->n_attrstamp = 0;
+	KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
+	for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
+		np->n_accesscache[i].stamp = 0;
+	KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
+	mtx_unlock(&np->n_mtx);
+}
+
 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
 /*
  * This function finds the directory cookie that corresponds to the