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SUNRPC: Simplify identification of when the message send/receive is complete

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Add states to indicate that the message send and receive are not yet
complete.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2018-08-28 09:00:27 -04:00
parent 3021a5bbbf
commit 7ebbbc6e7b
3 changed files with 25 additions and 17 deletions
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17
net/sunrpc/xprt.c
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@ -936,10 +936,18 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
/* req->rq_reply_bytes_recvd */
smp_wmb();
req->rq_reply_bytes_recvd = copied;
clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate);
rpc_wake_up_queued_task(&xprt->pending, task);
}
EXPORT_SYMBOL_GPL(xprt_complete_rqst);
static bool
xprt_request_data_received(struct rpc_task *task)
{
return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) &&
task->tk_rqstp->rq_reply_bytes_recvd != 0;
}
static void xprt_timer(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
@ -1031,12 +1039,13 @@ void xprt_transmit(struct rpc_task *task)
/* Add request to the receive list */
spin_lock(&xprt->recv_lock);
list_add_tail(&req->rq_list, &xprt->recv);
set_bit(RPC_TASK_NEED_RECV, &task->tk_runstate);
spin_unlock(&xprt->recv_lock);
xprt_reset_majortimeo(req);
/* Turn off autodisconnect */
del_singleshot_timer_sync(&xprt->timer);
}
} else if (!req->rq_bytes_sent)
} else if (xprt_request_data_received(task) && !req->rq_bytes_sent)
return;
connect_cookie = xprt->connect_cookie;
@ -1046,9 +1055,11 @@ void xprt_transmit(struct rpc_task *task)
task->tk_status = status;
return;
}
xprt_inject_disconnect(xprt);
dprintk("RPC: %5u xmit complete\n", task->tk_pid);
clear_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
task->tk_flags |= RPC_TASK_SENT;
spin_lock_bh(&xprt->transport_lock);
@ -1062,14 +1073,14 @@ void xprt_transmit(struct rpc_task *task)
spin_unlock_bh(&xprt->transport_lock);
req->rq_connect_cookie = connect_cookie;
if (rpc_reply_expected(task) && !READ_ONCE(req->rq_reply_bytes_recvd)) {
if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) {
/*
* Sleep on the pending queue if we're expecting a reply.
* The spinlock ensures atomicity between the test of
* req->rq_reply_bytes_recvd, and the call to rpc_sleep_on().
*/
spin_lock(&xprt->recv_lock);
if (!req->rq_reply_bytes_recvd) {
if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) {
rpc_sleep_on(&xprt->pending, task, xprt_timer);
/*
* Send an extra queue wakeup call if the