From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 2 Oct 2007 16:54:39 +0000 (-0400)
Subject: NFS: Optimise nfs_lookup_revalidate()
X-Git-Tag: v2.6.24-rc1~1285^2~23
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=f2c77f4e62a2290ae46b5b0449eb72d72afe691e;p=linux.git

NFS: Optimise nfs_lookup_revalidate()

We don't need to call nfs_revalidate_inode() on the directory if we already
know that the verifiers don't match.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 34da48586829..cf80cf234e27 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -646,9 +646,14 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry)
 {
 	if (IS_ROOT(dentry))
 		return 1;
-	if (nfs_verify_change_attribute(dir, dentry->d_time))
-		return 1;
-	return 0;
+	if (!nfs_verify_change_attribute(dir, dentry->d_time))
+		return 0;
+	/* Revalidate nfsi->cache_change_attribute before we declare a match */
+	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
+		return 0;
+	if (!nfs_verify_change_attribute(dir, dentry->d_time))
+		return 0;
+	return 1;
 }
 
 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
@@ -742,10 +747,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
 	nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
 	inode = dentry->d_inode;
 
-	/* Revalidate parent directory attribute cache */
-	if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
-		goto out_zap_parent;
-
 	if (!inode) {
 		if (nfs_neg_need_reval(dir, dentry, nd))
 			goto out_bad;