From: Chuck Lever <chuck.lever@oracle.com>
Date: Sat, 24 Oct 2015 21:26:29 +0000 (-0400)
Subject: xprtrdma: Enable swap-on-NFS/RDMA
X-Git-Tag: firefly_0821_release~176^2~745^2~5^2~15
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a045178887ebafa9514d6b4cb840ac13a26c8365;p=firefly-linux-kernel-4.4.55.git

xprtrdma: Enable swap-on-NFS/RDMA

After adding a swapfile on an NFS/RDMA mount and removing the
normal swap partition, I was able to push the NFS client well
into swap without any issue.

I forgot to swapoff the NFS file before rebooting. This pinned
the NFS mount and the IB core and provider, causing shutdown to
hang. I think this is expected and safe behavior. Probably
shutdown scripts should "swapoff -a" before unmounting any
filesystems.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 41e452bc580c..e9e5ed7a57fe 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -676,7 +676,7 @@ static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
 static int
 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
 {
-	return -EINVAL;
+	return 0;
 }
 
 static void