diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index 0b0090d..5375020 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -83,11 +83,11 @@
 	rdsdebug("ic %p send %p rm %p\n", ic, send, rm);
 
 	ib_dma_unmap_sg(ic->i_cm_id->device,
-		     rm->m_sg, rm->m_nents,
-		     DMA_TO_DEVICE);
+			rm->data.m_sg, rm->data.m_nents,
+			DMA_TO_DEVICE);
 
-	if (rm->m_rdma_op) {
-		rds_ib_send_unmap_rdma(ic, rm->m_rdma_op);
+	if (rm->rdma.m_rdma_op) {
+		rds_ib_send_unmap_rdma(ic, rm->rdma.m_rdma_op);
 
 		/* If the user asked for a completion notification on this
 		 * message, we can implement three different semantics:
@@ -111,10 +111,10 @@
 		 */
 		rds_ib_send_rdma_complete(rm, wc_status);
 
-		if (rm->m_rdma_op->r_write)
-			rds_stats_add(s_send_rdma_bytes, rm->m_rdma_op->r_bytes);
+		if (rm->rdma.m_rdma_op->r_write)
+			rds_stats_add(s_send_rdma_bytes, rm->rdma.m_rdma_op->r_bytes);
 		else
-			rds_stats_add(s_recv_rdma_bytes, rm->m_rdma_op->r_bytes);
+			rds_stats_add(s_recv_rdma_bytes, rm->rdma.m_rdma_op->r_bytes);
 	}
 
 	/* If anyone waited for this message to get flushed out, wake
@@ -244,8 +244,8 @@
 
 				rm = rds_send_get_message(conn, send->s_op);
 				if (rm) {
-					if (rm->m_rdma_op)
-						rds_ib_send_unmap_rdma(ic, rm->m_rdma_op);
+					if (rm->rdma.m_rdma_op)
+						rds_ib_send_unmap_rdma(ic, rm->rdma.m_rdma_op);
 					rds_ib_send_rdma_complete(rm, wc.status);
 					rds_message_put(rm);
 				}
@@ -532,18 +532,20 @@
 				rm->m_inc.i_hdr.h_flags,
 				be32_to_cpu(rm->m_inc.i_hdr.h_len));
 		   */
-		if (rm->m_nents) {
-			rm->m_count = ib_dma_map_sg(dev,
-					 rm->m_sg, rm->m_nents, DMA_TO_DEVICE);
-			rdsdebug("ic %p mapping rm %p: %d\n", ic, rm, rm->m_count);
-			if (rm->m_count == 0) {
+		if (rm->data.m_nents) {
+			rm->data.m_count = ib_dma_map_sg(dev,
+							    rm->data.m_sg,
+							    rm->data.m_nents,
+							    DMA_TO_DEVICE);
+			rdsdebug("ic %p mapping rm %p: %d\n", ic, rm, rm->data.m_count);
+			if (rm->data.m_count == 0) {
 				rds_ib_stats_inc(s_ib_tx_sg_mapping_failure);
 				rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc);
 				ret = -ENOMEM; /* XXX ? */
 				goto out;
 			}
 		} else {
-			rm->m_count = 0;
+			rm->data.m_count = 0;
 		}
 
 		ic->i_unsignaled_wrs = rds_ib_sysctl_max_unsig_wrs;
@@ -559,10 +561,10 @@
 
 		/* If it has a RDMA op, tell the peer we did it. This is
 		 * used by the peer to release use-once RDMA MRs. */
-		if (rm->m_rdma_op) {
+		if (rm->rdma.m_rdma_op) {
 			struct rds_ext_header_rdma ext_hdr;
 
-			ext_hdr.h_rdma_rkey = cpu_to_be32(rm->m_rdma_op->r_key);
+			ext_hdr.h_rdma_rkey = cpu_to_be32(rm->rdma.m_rdma_op->r_key);
 			rds_message_add_extension(&rm->m_inc.i_hdr,
 					RDS_EXTHDR_RDMA, &ext_hdr, sizeof(ext_hdr));
 		}
@@ -590,7 +592,7 @@
 	send = &ic->i_sends[pos];
 	first = send;
 	prev = NULL;
-	scat = &rm->m_sg[sg];
+	scat = &rm->data.m_sg[sg];
 	sent = 0;
 	i = 0;
 
@@ -600,7 +602,7 @@
 	 * or when requested by the user. Right now, we let
 	 * the application choose.
 	 */
-	if (rm->m_rdma_op && rm->m_rdma_op->r_fence)
+	if (rm->rdma.m_rdma_op && rm->rdma.m_rdma_op->r_fence)
 		send_flags = IB_SEND_FENCE;
 
 	/*
@@ -619,7 +621,7 @@
 	}
 
 	/* if there's data reference it with a chain of work reqs */
-	for (; i < work_alloc && scat != &rm->m_sg[rm->m_count]; i++) {
+	for (; i < work_alloc && scat != &rm->data.m_sg[rm->data.m_count]; i++) {
 		unsigned int len;
 
 		send = &ic->i_sends[pos];
@@ -697,7 +699,7 @@
 		sent += sizeof(struct rds_header);
 
 	/* if we finished the message then send completion owns it */
-	if (scat == &rm->m_sg[rm->m_count]) {
+	if (scat == &rm->data.m_sg[rm->data.m_count]) {
 		prev->s_rm = ic->i_rm;
 		prev->s_wr.send_flags |= IB_SEND_SIGNALED | IB_SEND_SOLICITED;
 		ic->i_rm = NULL;
diff --git a/net/rds/iw_send.c b/net/rds/iw_send.c
index dced532..c187e8f 100644
--- a/net/rds/iw_send.c
+++ b/net/rds/iw_send.c
@@ -83,11 +83,11 @@
 	rdsdebug("ic %p send %p rm %p\n", ic, send, rm);
 
 	ib_dma_unmap_sg(ic->i_cm_id->device,
-		     rm->m_sg, rm->m_nents,
+		     rm->data.m_sg, rm->data.m_nents,
 		     DMA_TO_DEVICE);
 
-	if (rm->m_rdma_op) {
-		rds_iw_send_unmap_rdma(ic, rm->m_rdma_op);
+	if (rm->rdma.m_rdma_op) {
+		rds_iw_send_unmap_rdma(ic, rm->rdma.m_rdma_op);
 
 		/* If the user asked for a completion notification on this
 		 * message, we can implement three different semantics:
@@ -111,10 +111,10 @@
 		 */
 		rds_iw_send_rdma_complete(rm, wc_status);
 
-		if (rm->m_rdma_op->r_write)
-			rds_stats_add(s_send_rdma_bytes, rm->m_rdma_op->r_bytes);
+		if (rm->rdma.m_rdma_op->r_write)
+			rds_stats_add(s_send_rdma_bytes, rm->rdma.m_rdma_op->r_bytes);
 		else
-			rds_stats_add(s_recv_rdma_bytes, rm->m_rdma_op->r_bytes);
+			rds_stats_add(s_recv_rdma_bytes, rm->rdma.m_rdma_op->r_bytes);
 	}
 
 	/* If anyone waited for this message to get flushed out, wake
@@ -563,18 +563,20 @@
 				rm->m_inc.i_hdr.h_flags,
 				be32_to_cpu(rm->m_inc.i_hdr.h_len));
 		   */
-		if (rm->m_nents) {
-			rm->m_count = ib_dma_map_sg(dev,
-					 rm->m_sg, rm->m_nents, DMA_TO_DEVICE);
-			rdsdebug("ic %p mapping rm %p: %d\n", ic, rm, rm->m_count);
-			if (rm->m_count == 0) {
+		if (rm->data.m_nents) {
+			rm->data.m_count = ib_dma_map_sg(dev,
+						    rm->data.m_sg,
+						    rm->data.m_nents,
+						    DMA_TO_DEVICE);
+			rdsdebug("ic %p mapping rm %p: %d\n", ic, rm, rm->data.m_count);
+			if (rm->data.m_count == 0) {
 				rds_iw_stats_inc(s_iw_tx_sg_mapping_failure);
 				rds_iw_ring_unalloc(&ic->i_send_ring, work_alloc);
 				ret = -ENOMEM; /* XXX ? */
 				goto out;
 			}
 		} else {
-			rm->m_count = 0;
+			rm->data.m_count = 0;
 		}
 
 		ic->i_unsignaled_wrs = rds_iw_sysctl_max_unsig_wrs;
@@ -590,10 +592,10 @@
 
 		/* If it has a RDMA op, tell the peer we did it. This is
 		 * used by the peer to release use-once RDMA MRs. */
-		if (rm->m_rdma_op) {
+		if (rm->rdma.m_rdma_op) {
 			struct rds_ext_header_rdma ext_hdr;
 
-			ext_hdr.h_rdma_rkey = cpu_to_be32(rm->m_rdma_op->r_key);
+			ext_hdr.h_rdma_rkey = cpu_to_be32(rm->rdma.m_rdma_op->r_key);
 			rds_message_add_extension(&rm->m_inc.i_hdr,
 					RDS_EXTHDR_RDMA, &ext_hdr, sizeof(ext_hdr));
 		}
@@ -621,7 +623,7 @@
 	send = &ic->i_sends[pos];
 	first = send;
 	prev = NULL;
-	scat = &rm->m_sg[sg];
+	scat = &rm->data.m_sg[sg];
 	sent = 0;
 	i = 0;
 
@@ -631,7 +633,7 @@
 	 * or when requested by the user. Right now, we let
 	 * the application choose.
 	 */
-	if (rm->m_rdma_op && rm->m_rdma_op->r_fence)
+	if (rm->rdma.m_rdma_op && rm->rdma.m_rdma_op->r_fence)
 		send_flags = IB_SEND_FENCE;
 
 	/*
@@ -650,7 +652,7 @@
 	}
 
 	/* if there's data reference it with a chain of work reqs */
-	for (; i < work_alloc && scat != &rm->m_sg[rm->m_count]; i++) {
+	for (; i < work_alloc && scat != &rm->data.m_sg[rm->data.m_count]; i++) {
 		unsigned int len;
 
 		send = &ic->i_sends[pos];
@@ -728,7 +730,7 @@
 		sent += sizeof(struct rds_header);
 
 	/* if we finished the message then send completion owns it */
-	if (scat == &rm->m_sg[rm->m_count]) {
+	if (scat == &rm->data.m_sg[rm->data.m_count]) {
 		prev->s_rm = ic->i_rm;
 		prev->s_wr.send_flags |= IB_SEND_SIGNALED | IB_SEND_SOLICITED;
 		ic->i_rm = NULL;
diff --git a/net/rds/message.c b/net/rds/message.c
index 809656c..4421d16 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -63,17 +63,17 @@
 	if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
 		return;
 
-	for (i = 0; i < rm->m_nents; i++) {
-		rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i]));
+	for (i = 0; i < rm->data.m_nents; i++) {
+		rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.m_sg[i]));
 		/* XXX will have to put_page for page refs */
-		__free_page(sg_page(&rm->m_sg[i]));
+		__free_page(sg_page(&rm->data.m_sg[i]));
 	}
-	rm->m_nents = 0;
+	rm->data.m_nents = 0;
 
-	if (rm->m_rdma_op)
-		rds_rdma_free_op(rm->m_rdma_op);
-	if (rm->m_rdma_mr)
-		rds_mr_put(rm->m_rdma_mr);
+	if (rm->rdma.m_rdma_op)
+		rds_rdma_free_op(rm->rdma.m_rdma_op);
+	if (rm->rdma.m_rdma_mr)
+		rds_mr_put(rm->rdma.m_rdma_mr);
 }
 
 void rds_message_inc_purge(struct rds_incoming *inc)
@@ -224,7 +224,7 @@
 		goto out;
 
 	if (nents)
-		sg_init_table(rm->m_sg, nents);
+		sg_init_table(rm->data.m_sg, nents);
 	atomic_set(&rm->m_refcount, 1);
 	INIT_LIST_HEAD(&rm->m_sock_item);
 	INIT_LIST_HEAD(&rm->m_conn_item);
@@ -245,10 +245,10 @@
 
 	set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
 	rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
-	rm->m_nents = ceil(total_len, PAGE_SIZE);
+	rm->data.m_nents = ceil(total_len, PAGE_SIZE);
 
-	for (i = 0; i < rm->m_nents; ++i) {
-		sg_set_page(&rm->m_sg[i],
+	for (i = 0; i < rm->data.m_nents; ++i) {
+		sg_set_page(&rm->data.m_sg[i],
 				virt_to_page(page_addrs[i]),
 				PAGE_SIZE, 0);
 	}
@@ -278,7 +278,7 @@
 	/*
 	 * now allocate and copy in the data payload.
 	 */
-	sg = rm->m_sg;
+	sg = rm->data.m_sg;
 	iov = first_iov;
 	iov_off = 0;
 	sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
@@ -289,7 +289,7 @@
 						       GFP_HIGHUSER);
 			if (ret)
 				goto out;
-			rm->m_nents++;
+			rm->data.m_nents++;
 			sg_off = 0;
 		}
 
@@ -348,7 +348,7 @@
 
 	iov = first_iov;
 	iov_off = 0;
-	sg = rm->m_sg;
+	sg = rm->data.m_sg;
 	vec_off = 0;
 	copied = 0;
 
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index dee698b..24274bb 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -643,14 +643,14 @@
 	struct rds_rdma_op *op;
 
 	if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct rds_rdma_args)) ||
-	    rm->m_rdma_op)
+	    rm->rdma.m_rdma_op)
 		return -EINVAL;
 
 	op = rds_rdma_prepare(rs, CMSG_DATA(cmsg));
 	if (IS_ERR(op))
 		return PTR_ERR(op);
 	rds_stats_inc(s_send_rdma);
-	rm->m_rdma_op = op;
+	rm->rdma.m_rdma_op = op;
 	return 0;
 }
 
@@ -679,6 +679,7 @@
 	 */
 	r_key = rds_rdma_cookie_key(rm->m_rdma_cookie);
 
+
 	spin_lock_irqsave(&rs->rs_rdma_lock, flags);
 	mr = rds_mr_tree_walk(&rs->rs_rdma_keys, r_key, NULL);
 	if (!mr)
@@ -689,7 +690,7 @@
 
 	if (mr) {
 		mr->r_trans->sync_mr(mr->r_trans_private, DMA_TO_DEVICE);
-		rm->m_rdma_mr = mr;
+		rm->rdma.m_rdma_mr = mr;
 	}
 	return err;
 }
@@ -707,5 +708,5 @@
 	    rm->m_rdma_cookie != 0)
 		return -EINVAL;
 
-	return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie, &rm->m_rdma_mr);
+	return __rds_rdma_map(rs, CMSG_DATA(cmsg), &rm->m_rdma_cookie, &rm->rdma.m_rdma_mr);
 }
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 1d3eef6..07a750b 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -259,12 +259,18 @@
 	 */
 	spinlock_t		m_rs_lock;
 	struct rds_sock		*m_rs;
-	struct rds_rdma_op	*m_rdma_op;
 	rds_rdma_cookie_t	m_rdma_cookie;
-	struct rds_mr		*m_rdma_mr;
-	unsigned int		m_nents;
-	unsigned int		m_count;
-	struct scatterlist	m_sg[0];
+	struct {
+		struct {
+			struct rds_rdma_op	*m_rdma_op;
+			struct rds_mr		*m_rdma_mr;
+		} rdma;
+		struct {
+			unsigned int		m_nents;
+			unsigned int		m_count;
+			struct scatterlist	m_sg[0];
+		} data;
+	};
 };
 
 /*
diff --git a/net/rds/send.c b/net/rds/send.c
index 817997d..19dfd02 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -166,7 +166,7 @@
 		rm = conn->c_xmit_rm;
 		if (rm &&
 		    conn->c_xmit_hdr_off == sizeof(struct rds_header) &&
-		    conn->c_xmit_sg == rm->m_nents) {
+		    conn->c_xmit_sg == rm->data.m_nents) {
 			conn->c_xmit_rm = NULL;
 			conn->c_xmit_sg = 0;
 			conn->c_xmit_hdr_off = 0;
@@ -236,7 +236,7 @@
 			 * connection.
 			 * Therefore, we never retransmit messages with RDMA ops.
 			 */
-			if (rm->m_rdma_op &&
+			if (rm->rdma.m_rdma_op &&
 			    test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) {
 				spin_lock_irqsave(&conn->c_lock, flags);
 				if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags))
@@ -268,8 +268,8 @@
 		 * keep this simple and require that the transport either
 		 * send the whole rdma or none of it.
 		 */
-		if (rm->m_rdma_op && !conn->c_xmit_rdma_sent) {
-			ret = conn->c_trans->xmit_rdma(conn, rm->m_rdma_op);
+		if (rm->rdma.m_rdma_op && !conn->c_xmit_rdma_sent) {
+			ret = conn->c_trans->xmit_rdma(conn, rm->rdma.m_rdma_op);
 			if (ret)
 				break;
 			conn->c_xmit_rdma_sent = 1;
@@ -279,7 +279,7 @@
 		}
 
 		if (conn->c_xmit_hdr_off < sizeof(struct rds_header) ||
-		    conn->c_xmit_sg < rm->m_nents) {
+		    conn->c_xmit_sg < rm->data.m_nents) {
 			ret = conn->c_trans->xmit(conn, rm,
 						  conn->c_xmit_hdr_off,
 						  conn->c_xmit_sg,
@@ -295,7 +295,7 @@
 				ret -= tmp;
 			}
 
-			sg = &rm->m_sg[conn->c_xmit_sg];
+			sg = &rm->data.m_sg[conn->c_xmit_sg];
 			while (ret) {
 				tmp = min_t(int, ret, sg->length -
 						      conn->c_xmit_data_off);
@@ -306,7 +306,7 @@
 					sg++;
 					conn->c_xmit_sg++;
 					BUG_ON(ret != 0 &&
-					       conn->c_xmit_sg == rm->m_nents);
+					       conn->c_xmit_sg == rm->data.m_nents);
 				}
 			}
 		}
@@ -419,7 +419,7 @@
 
 	spin_lock_irqsave(&rm->m_rs_lock, flags);
 
-	ro = rm->m_rdma_op;
+	ro = rm->rdma.m_rdma_op;
 	if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
 	    ro && ro->r_notify && ro->r_notifier) {
 		notifier = ro->r_notifier;
@@ -453,7 +453,7 @@
 {
 	struct rds_rdma_op *ro;
 
-	ro = rm->m_rdma_op;
+	ro = rm->rdma.m_rdma_op;
 	if (ro && ro->r_notify && ro->r_notifier) {
 		ro->r_notifier->n_status = status;
 		list_add_tail(&ro->r_notifier->n_list, &rs->rs_notify_queue);
@@ -477,7 +477,7 @@
 	spin_lock_irqsave(&conn->c_lock, flags);
 
 	list_for_each_entry_safe(rm, tmp, &conn->c_retrans, m_conn_item) {
-		if (rm->m_rdma_op == op) {
+		if (rm->rdma.m_rdma_op == op) {
 			atomic_inc(&rm->m_refcount);
 			found = rm;
 			goto out;
@@ -485,7 +485,7 @@
 	}
 
 	list_for_each_entry_safe(rm, tmp, &conn->c_send_queue, m_conn_item) {
-		if (rm->m_rdma_op == op) {
+		if (rm->rdma.m_rdma_op == op) {
 			atomic_inc(&rm->m_refcount);
 			found = rm;
 			break;
@@ -545,7 +545,7 @@
 		spin_lock(&rs->rs_lock);
 
 		if (test_and_clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags)) {
-			struct rds_rdma_op *ro = rm->m_rdma_op;
+			struct rds_rdma_op *ro = rm->rdma.m_rdma_op;
 			struct rds_notifier *notifier;
 
 			list_del_init(&rm->m_sock_item);
@@ -557,7 +557,7 @@
 						&rs->rs_notify_queue);
 				if (!notifier->n_status)
 					notifier->n_status = status;
-				rm->m_rdma_op->r_notifier = NULL;
+				rm->rdma.m_rdma_op->r_notifier = NULL;
 			}
 			was_on_sock = 1;
 			rm->m_rs = NULL;
@@ -874,11 +874,11 @@
 	if (ret)
 		goto out;
 
-	if ((rm->m_rdma_cookie || rm->m_rdma_op) &&
+	if ((rm->m_rdma_cookie || rm->rdma.m_rdma_op) &&
 	    !conn->c_trans->xmit_rdma) {
 		if (printk_ratelimit())
 			printk(KERN_NOTICE "rdma_op %p conn xmit_rdma %p\n",
-				rm->m_rdma_op, conn->c_trans->xmit_rdma);
+				rm->rdma.m_rdma_op, conn->c_trans->xmit_rdma);
 		ret = -EOPNOTSUPP;
 		goto out;
 	}
diff --git a/net/rds/tcp_send.c b/net/rds/tcp_send.c
index e5f6cce..d63aa35 100644
--- a/net/rds/tcp_send.c
+++ b/net/rds/tcp_send.c
@@ -166,21 +166,21 @@
 			goto out;
 	}
 
-	while (sg < rm->m_nents) {
+	while (sg < rm->data.m_nents) {
 		ret = tc->t_sock->ops->sendpage(tc->t_sock,
-						sg_page(&rm->m_sg[sg]),
-						rm->m_sg[sg].offset + off,
-						rm->m_sg[sg].length - off,
+						sg_page(&rm->data.m_sg[sg]),
+						rm->data.m_sg[sg].offset + off,
+						rm->data.m_sg[sg].length - off,
 						MSG_DONTWAIT|MSG_NOSIGNAL);
-		rdsdebug("tcp sendpage %p:%u:%u ret %d\n", (void *)sg_page(&rm->m_sg[sg]),
-			 rm->m_sg[sg].offset + off, rm->m_sg[sg].length - off,
+		rdsdebug("tcp sendpage %p:%u:%u ret %d\n", (void *)sg_page(&rm->data.m_sg[sg]),
+			 rm->data.m_sg[sg].offset + off, rm->data.m_sg[sg].length - off,
 			 ret);
 		if (ret <= 0)
 			break;
 
 		off += ret;
 		done += ret;
-		if (off == rm->m_sg[sg].length) {
+		if (off == rm->data.m_sg[sg].length) {
 			off = 0;
 			sg++;
 		}