NFS: Don't revalidate dentries on directory size or ctime changes

We only need to look at the mtime changes...
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/inode.c

@@ -1015,10 +1015,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 			nfsi->cache_change_attribute = now;
 		}
 		/* If ctime has changed we should definitely clear access+acl caches */
-		if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
+		if (!timespec_equal(&inode->i_ctime, &fattr->ctime))
 			invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
-			nfsi->cache_change_attribute = now;
-		}
 	} else if (nfsi->change_attr != fattr->change_attr) {
 		dprintk("NFS: change_attr change on server for file %s/%ld\n",
 				inode->i_sb->s_id, inode->i_ino);
@@ -1036,7 +1034,6 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 			inode->i_size = new_isize;
 			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 		}
-		nfsi->cache_change_attribute = now;
 		dprintk("NFS: isize change on server for file %s/%ld\n",
 				inode->i_sb->s_id, inode->i_ino);
 	}