SUNRPC: Add a new error code for retry waiting for another binder
Add new error code processing to the kernel's rpcbind client and to
call_bind_status() to distinguish two cases:
Case 1: the remote has replied that the program/version tuple is not
registered (returns -EACCES)
Case 2: another process is already in the middle of binding on this
transport (now returns -EAGAIN)
This change allows more specific retry processing for each of these two
cases.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 7a7cd3b..e53d718 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -950,6 +950,12 @@
}
switch (task->tk_status) {
+ case -EAGAIN:
+ dprintk("RPC: %5u rpcbind waiting for another request "
+ "to finish\n", task->tk_pid);
+ /* avoid busy-waiting here -- could be a network outage. */
+ rpc_delay(task, 5*HZ);
+ goto retry_timeout;
case -EACCES:
dprintk("RPC: %5u remote rpcbind: RPC program/version "
"unavailable\n", task->tk_pid);