SUNRPC: Fix up xprt_write_space()

The rest of the networking layer uses SOCK_ASYNC_NOSPACE to signal whether
or not we have someone waiting for buffer memory. Convert the SUNRPC layer
to use the same idiom.
Remove the unlikely()s in xs_udp_write_space and xs_tcp_write_space. In
fact, the most common case will be that there is nobody waiting for buffer
space.

SOCK_NOSPACE is there to tell the TCP layer whether or not the cwnd was
limited by the application window. Ensure that we follow the same idiom as
the rest of the networking layer here too.

Finally, ensure that we clear SOCK_ASYNC_NOSPACE once we wake up, so that
write_space() doesn't keep waking things up on xprt->pending.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index b3ff9a815e6f..8a0629abb86a 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -232,7 +232,7 @@ int			xprt_unregister_transport(struct xprt_class *type);
 void                    xprt_set_retrans_timeout_def(struct rpc_task *task);
 void                    xprt_set_retrans_timeout_rtt(struct rpc_task *task);
 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
-void                    xprt_wait_for_buffer_space(struct rpc_task *task);
+void                    xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
 void                    xprt_write_space(struct rpc_xprt *xprt);
 void                    xprt_update_rtt(struct rpc_task *task);
 void                    xprt_adjust_cwnd(struct rpc_task *task, int result);