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SUNRPC: Make "no retrans timeout" soft tasks behave like softconn for timeouts 

If a soft NFSv4 request is sent, then we don't need it to time out unless
the connection breaks. The reason is that as long as the connection is
unbroken, the protocol states that the server is not allowed to drop the
request.  IOW: as long as the connection remains unbroken, the client may
assume that all transmitted RPC requests are being processed by the server,
and that retransmissions and timeouts of those requests are unwarranted.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-07 13:58:55 -04:00 committed by Anna Schumaker
parent 5ad64b36dd
commit e4ec48d3cc
1 changed files with 9 additions and 0 deletions
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9
net/sunrpc/clnt.c
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@ -2318,6 +2318,15 @@ rpc_check_timeout(struct rpc_task *task)
}
if (RPC_IS_SOFT(task)) {
/*
* Once a "no retrans timeout" soft tasks (a.k.a NFSv4) has
* been sent, it should time out only if the transport
* connection gets terminally broken.
*/
if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) &&
rpc_check_connected(task->tk_rqstp))
return;
if (clnt->cl_chatty) {
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
clnt->cl_program->name,