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SUNRPC: Don't disconnect more than once if retransmitting NFSv4 requests

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NFSv4 requires us to ensure that we break the TCP connection before we're
allowed to retransmit a request. However in the case where we're
retransmitting several requests that have been sent on the same
connection, we need to ensure that we don't interfere with the attempt to
reconnect and/or break the connection again once it has been established.

We therefore introduce a 'connection' cookie that is bumped every time a
connection is broken. This allows requests to track if they need to force a
disconnection.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-04-17 16:52:57 -04:00
parent 636ac43318
commit 7c1d71cf56
4 changed files with 43 additions and 2 deletions
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8
include/linux/sunrpc/xprt.h
View File

@ -86,6 +86,10 @@ struct rpc_rqst {
unsigned long rq_majortimeo; /* major timeout alarm */
unsigned long rq_timeout; /* Current timeout value */
unsigned int rq_retries; /* # of retries */
unsigned int rq_connect_cookie;
/* A cookie used to track the
state of the transport
connection */
/*
* Partial send handling
@ -152,6 +156,9 @@ struct rpc_xprt {
unsigned long connect_timeout,
bind_timeout,
reestablish_timeout;
unsigned int connect_cookie; /* A cookie that gets bumped
every time the transport
is reconnected */
/*
* Disconnection of idle transports
@ -241,6 +248,7 @@ void xprt_complete_rqst(struct rpc_task *task, int copied);
void xprt_release_rqst_cong(struct rpc_task *task);
void xprt_disconnect_done(struct rpc_xprt *xprt);
void xprt_force_disconnect(struct rpc_xprt *xprt);
void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
/*
* Reserved bit positions in xprt->state

6
net/sunrpc/clnt.c
View File

@ -1120,7 +1120,8 @@ call_status(struct rpc_task *task)
case -ETIMEDOUT:
task->tk_action = call_timeout;
if (task->tk_client->cl_discrtry)
xprt_force_disconnect(task->tk_xprt);
xprt_conditional_disconnect(task->tk_xprt,
req->rq_connect_cookie);
break;
case -ECONNREFUSED:
case -ENOTCONN:
@ -1245,7 +1246,8 @@ out_retry:
if (task->tk_rqstp == req) {
req->rq_received = req->rq_rcv_buf.len = 0;
if (task->tk_client->cl_discrtry)
xprt_force_disconnect(task->tk_xprt);
xprt_conditional_disconnect(task->tk_xprt,
req->rq_connect_cookie);
}
}

29
net/sunrpc/xprt.c
View File

@ -606,6 +606,34 @@ void xprt_force_disconnect(struct rpc_xprt *xprt)
spin_unlock_bh(&xprt->transport_lock);
}
/**
* xprt_conditional_disconnect - force a transport to disconnect
* @xprt: transport to disconnect
* @cookie: 'connection cookie'
*
* This attempts to break the connection if and only if 'cookie' matches
* the current transport 'connection cookie'. It ensures that we don't
* try to break the connection more than once when we need to retransmit
* a batch of RPC requests.
*
*/
void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie)
{
/* Don't race with the test_bit() in xprt_clear_locked() */
spin_lock_bh(&xprt->transport_lock);
if (cookie != xprt->connect_cookie)
goto out;
if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt))
goto out;
set_bit(XPRT_CLOSE_WAIT, &xprt->state);
/* Try to schedule an autoclose RPC call */
if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
queue_work(rpciod_workqueue, &xprt->task_cleanup);
xprt_wake_pending_tasks(xprt, -ENOTCONN);
out:
spin_unlock_bh(&xprt->transport_lock);
}
static void
xprt_init_autodisconnect(unsigned long data)
{
@ -849,6 +877,7 @@ void xprt_transmit(struct rpc_task *task)
} else if (!req->rq_bytes_sent)
return;
req->rq_connect_cookie = xprt->connect_cookie;
status = xprt->ops->send_request(task);
if (status == 0) {
dprintk("RPC: %5u xmit complete\n", task->tk_pid);

2
net/sunrpc/xprtsock.c
View File

@ -1142,6 +1142,7 @@ static void xs_tcp_state_change(struct sock *sk)
break;
case TCP_FIN_WAIT1:
/* The client initiated a shutdown of the socket */
xprt->connect_cookie++;
xprt->reestablish_timeout = 0;
set_bit(XPRT_CLOSING, &xprt->state);
smp_mb__before_clear_bit();
@ -1154,6 +1155,7 @@ static void xs_tcp_state_change(struct sock *sk)
set_bit(XPRT_CLOSING, &xprt->state);
xprt_force_disconnect(xprt);
case TCP_SYN_SENT:
xprt->connect_cookie++;
case TCP_CLOSING:
/*
* If the server closed down the connection, make sure that