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SUNRPC: new interface to force an RPC rebind

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We'd like to hide fields in rpc_xprt and rpc_clnt from upper layer protocols.
 Start by creating an API to force RPC rebind, replacing logic that simply
 sets cl_port to zero.

 Test-plan:
 Destructive testing (unplugging the network temporarily).  Connectathon
 with UDP and TCP.  NFSv2/3 and NFSv4 mounting should be carefully checked.
 Probably need to rig a server where certain services aren't running, or
 that returns an error for some typical operation.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2006-01-03 09:55:50 +01:00
committed by Trond Myklebust
parent 0210714834
commit 35f5a422ce
3 changed files with 18 additions and 8 deletions
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21
net/sunrpc/clnt.c
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@@ -538,6 +538,18 @@ size_t rpc_max_payload(struct rpc_clnt *clnt)
}
EXPORT_SYMBOL(rpc_max_payload);
/**
* rpc_force_rebind - force transport to check that remote port is unchanged
* @clnt: client to rebind
*
*/
void rpc_force_rebind(struct rpc_clnt *clnt)
{
if (clnt->cl_autobind)
clnt->cl_port = 0;
}
EXPORT_SYMBOL(rpc_force_rebind);
/*
* Restart an (async) RPC call. Usually called from within the
* exit handler.
@@ -853,8 +865,7 @@ call_connect_status(struct rpc_task *task)
}
/* Something failed: remote service port may have changed */
if (clnt->cl_autobind)
clnt->cl_port = 0;
rpc_force_rebind(clnt);
switch (status) {
case -ENOTCONN:
@@ -935,8 +946,7 @@ call_status(struct rpc_task *task)
break;
case -ECONNREFUSED:
case -ENOTCONN:
if (clnt->cl_autobind)
clnt->cl_port = 0;
rpc_force_rebind(clnt);
task->tk_action = call_bind;
break;
case -EAGAIN:
@@ -995,8 +1005,7 @@ call_timeout(struct rpc_task *task)
printk(KERN_NOTICE "%s: server %s not responding, still trying\n",
clnt->cl_protname, clnt->cl_server);
}
if (clnt->cl_autobind)
clnt->cl_port = 0;
rpc_force_rebind(clnt);
retry:
clnt->cl_stats->rpcretrans++;