[v3,12/29] SUNRPC: Make "no retrans timeout" soft tasks behave like softconn for timeouts
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Message ID 20190407175912.23528-13-trond.myklebust@hammerspace.com
State New
Headers show
Series
  • Fix up soft mounts for NFSv4.x
Related show

Commit Message

Trond Myklebust April 7, 2019, 5:58 p.m. UTC
If a soft NFSv4 request is sent, then we don't need it to time out unless
the connection breaks. The reason is that as long as the connection is
unbroken, the protocol states that the server is not allowed to drop the
request.  IOW: as long as the connection remains unbroken, the client may
assume that all transmitted RPC requests are being processed by the server,
and that retransmissions and timeouts of those requests are unwarranted.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 net/sunrpc/clnt.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch
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diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index a9e5e81c67be..c921a5aff790 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2344,6 +2344,15 @@  rpc_check_timeout(struct rpc_task *task)
 	}
 
 	if (RPC_IS_SOFT(task)) {
+		/*
+		 * Once a "no retrans timeout" soft tasks (a.k.a NFSv4) has
+		 * been sent, it should time out only if the transport
+		 * connection gets terminally broken.
+		 */
+		if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) &&
+		    rpc_check_connected(task->tk_rqstp))
+			return;
+
 		if (clnt->cl_chatty) {
 			printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
 				clnt->cl_program->name,