nfs: nfs4xdr: introduce print_overflow_msg

Part fo the nfs4xdr cleanup.  READ_BUF will go away.
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4xdr.c

@@ -2441,14 +2441,18 @@ static int nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req, uint32_t *p,
 #define READ_BUF(nbytes)  do { \
 	p = xdr_inline_decode(xdr, nbytes); \
 	if (unlikely(!p)) { \
-		dprintk("nfs: %s: prematurely hit end of receive" \
-				" buffer\n", __func__); \
-		dprintk("nfs: %s: xdr->p=%p, bytes=%u, xdr->end=%p\n", \
-				__func__, xdr->p, nbytes, xdr->end); \
+		print_overflow_msg(__func__, xdr); \
 		return -EIO; \
 	} \
 } while (0)
 
+static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
+{
+	dprintk("nfs: %s: prematurely hit end of receive buffer. "
+		"Remaining buffer length is %tu words.\n",
+		func, xdr->end - xdr->p);
+}
+
 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
 {
 	__be32 *p;