NFSv4.1: Use the more efficient open_noattr call for open-by-filehandle

When we're doing open-by-filehandle in NFSv4.1, we shouldn't need to
do the cache consistency revalidation on the directory. It is
therefore more efficient to just use open_noattr, which returns the
file attributes, but not the directory attributes.

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

fs/nfs/nfs4proc.c

@@ -1549,9 +1549,13 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 	}
 	/* Update client id. */
 	data->o_arg.clientid = clp->cl_clientid;
-	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
-		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
+	switch (data->o_arg.claim) {
+	case NFS4_OPEN_CLAIM_PREVIOUS:
+	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
+	case NFS4_OPEN_CLAIM_FH:
+		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 		nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 	}
 	data->timestamp = jiffies;