SUNRPC: Retry rpcbind requests if the server's portmapper isn't up

 After a server crash/reboot, rebinding should always retry, otherwise
 requests on "hard" mounts will fail when they shouldn't.

 Test plan:
 Run a lock-intensive workload against a server while rebooting the server
 repeatedly.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 5a8f01d726e9..a5f7029b1daa 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -759,7 +759,8 @@ call_bind_status(struct rpc_task *task)
         case -EACCES:
                 dprintk("RPC: %4d remote rpcbind: RPC program/version unavailable\n",
                                 task->tk_pid);
-                break;
+                rpc_delay(task, 3*HZ);
+                goto retry_bind;
         case -ETIMEDOUT:
                 dprintk("RPC: %4d rpcbind request timed out\n",
                                 task->tk_pid);