NFS: Use the inode->i_version to cache NFSv4 change attribute information

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

fs/nfs/nfs4proc.c

@@ -753,9 +753,9 @@ static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 
 	spin_lock(&dir->i_lock);
 	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
-	if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
+	if (!cinfo->atomic || cinfo->before != dir->i_version)
 		nfs_force_lookup_revalidate(dir);
-	nfsi->change_attr = cinfo->after;
+	dir->i_version = cinfo->after;
 	spin_unlock(&dir->i_lock);
 }