Back out some congestion control changes that were causing trouble,

among other things, for the "soft" mount option.

include/linux/sunrpc/timer.h

@@ -15,7 +15,6 @@ struct rpc_rtt {
 	unsigned long timeo;	/* default timeout value */
 	unsigned long srtt[5];	/* smoothed round trip time << 3 */
 	unsigned long sdrtt[5];	/* smoothed medium deviation of RTT */
-	atomic_t  ntimeouts;	/* Global count of the number of timeouts */
 };
 
 
@@ -23,19 +22,4 @@ extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
 extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
 extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);
 
-static inline void rpc_inc_timeo(struct rpc_rtt *rt)
-{
-	atomic_inc(&rt->ntimeouts);
-}
-
-static inline void rpc_clear_timeo(struct rpc_rtt *rt)
-{
-	atomic_set(&rt->ntimeouts, 0);
-}
-
-static inline int rpc_ntimeo(struct rpc_rtt *rt)
-{
-	return atomic_read(&rt->ntimeouts);
-}
-
 #endif /* _LINUX_SUNRPC_TIMER_H */

net/sunrpc/clnt.c

@@ -744,14 +744,14 @@ call_timeout(struct rpc_task *task)
 
 	dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
 	if (clnt->cl_softrtry) {
-		if (clnt->cl_chatty && !task->tk_exit)
+		if (clnt->cl_chatty)
 			printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
 				clnt->cl_protname, clnt->cl_server);
 		rpc_exit(task, -EIO);
 		return;
 	}
 
-	if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN) && rpc_ntimeo(&clnt->cl_rtt) > 7) {
+	if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) {
 		task->tk_flags |= RPC_CALL_MAJORSEEN;
 		printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
 			clnt->cl_protname, clnt->cl_server);

net/sunrpc/timer.c

@@ -41,8 +41,6 @@ rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo)
 		rt->srtt[i] = init;
 		rt->sdrtt[i] = RPC_RTO_INIT;
 	}
-
-	atomic_set(&rt->ntimeouts, 0);
 }
 
 /*

net/sunrpc/xprt.c

@@ -585,7 +585,6 @@ xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied)
 				rpc_update_rtt(&clnt->cl_rtt, timer,
 						(long)jiffies - req->rq_xtime);
 		}
-		rpc_clear_timeo(&clnt->cl_rtt);
 	}
 
 #ifdef RPC_PROFILE
@@ -1051,21 +1050,6 @@ xprt_write_space(struct sock *sk)
 	read_unlock(&sk->sk_callback_lock);
 }
 
-/*
- * Exponential backoff for UDP retries
- */
-static inline int
-xprt_expbackoff(struct rpc_task *task, struct rpc_rqst *req)
-{
-	int backoff;
-
-	req->rq_ntimeo++;
-	backoff = min(rpc_ntimeo(&task->tk_client->cl_rtt), XPRT_MAX_BACKOFF);
-	if (req->rq_ntimeo < (1 << backoff))
-		return 1;
-	return 0;
-}
-
 /*
  * RPC receive timeout handler.
  */
@@ -1079,14 +1063,7 @@ xprt_timer(struct rpc_task *task)
 	if (req->rq_received)
 		goto out;
 
-	if (!xprt->nocong) {
-		if (xprt_expbackoff(task, req)) {
-			rpc_add_timer(task, xprt_timer);
-			goto out_unlock;
-		}
-		rpc_inc_timeo(&task->tk_client->cl_rtt);
 	xprt_adjust_cwnd(req->rq_xprt, -ETIMEDOUT);
-	}
 	req->rq_nresend++;
 
 	dprintk("RPC: %4d xprt_timer (%s request)\n",
@@ -1096,7 +1073,6 @@ xprt_timer(struct rpc_task *task)
 out:
 	task->tk_timeout = 0;
 	rpc_wake_up_task(task);
-out_unlock:
 	spin_unlock(&xprt->sock_lock);
 }
 
@@ -1246,7 +1222,8 @@ xprt_transmit(struct rpc_task *task)
 	if (!xprt->nocong) {
 		task->tk_timeout = rpc_calc_rto(&clnt->cl_rtt,
 				task->tk_msg.rpc_proc->p_timer);
-		req->rq_ntimeo = 0;
+		task->tk_timeout <<= clnt->cl_timeout.to_retries
+			- req->rq_timeout.to_retries;
 		if (task->tk_timeout > req->rq_timeout.to_maxval)
 			task->tk_timeout = req->rq_timeout.to_maxval;
 	} else