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RPC: Fix the TCP resend semantics for NFSv4

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Fix a regression due to the patch "NFS: disconnect before retrying NFSv4
requests over TCP"

The assumption made in xprt_transmit() that the condition
	"req->rq_bytes_sent == 0 and request is on the receive list"
should imply that we're dealing with a retransmission is false.
Firstly, it may simply happen that the socket send queue was full
at the time the request was initially sent through xprt_transmit().
Secondly, doing this for each request that was retransmitted implies
that we disconnect and reconnect for _every_ request that happened to
be retransmitted irrespective of whether or not a disconnection has
already occurred.

Fix is to move this logic into the call_status request timeout handler.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Trond Myklebust 2007-04-20 16:12:55 -04:00 committed by Linus Torvalds
parent 2b82f190c8
commit 241c39b9ac
2 changed files with 4 additions and 10 deletions
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4
net/sunrpc/clnt.c
View file

@ -1046,6 +1046,8 @@ call_status(struct rpc_task *task)
rpc_delay(task, 3*HZ);
case -ETIMEDOUT:
task->tk_action = call_timeout;
if (task->tk_client->cl_discrtry)
xprt_disconnect(task->tk_xprt);
break;
case -ECONNREFUSED:
case -ENOTCONN:
@ -1169,6 +1171,8 @@ call_decode(struct rpc_task *task)
out_retry:
req->rq_received = req->rq_private_buf.len = 0;
task->tk_status = 0;
if (task->tk_client->cl_discrtry)
xprt_disconnect(task->tk_xprt);
}
/*

10
net/sunrpc/xprt.c
View file

@ -735,16 +735,6 @@ void xprt_transmit(struct rpc_task *task)
xprt_reset_majortimeo(req);
/* Turn off autodisconnect */
del_singleshot_timer_sync(&xprt->timer);
} else {
/* If all request bytes have been sent,
* then we must be retransmitting this one */
if (!req->rq_bytes_sent) {
if (task->tk_client->cl_discrtry) {
xprt_disconnect(xprt);
task->tk_status = -ENOTCONN;
return;
}
}
}
} else if (!req->rq_bytes_sent)
return;