[PATCH] RPC: expose API for serializing access to RPC transports

 The next method we abstract is the one that releases a transport,
 allowing another task to have access to the transport.

 Again, one generic version of this is provided for transports that
 don't need the RPC client to perform congestion control, and one
 version is for transports that can use the original Van Jacobson
 implementation in xprt.c.

 Test-plan:
 Use WAN simulation to cause sporadic bursty packet loss.  Look for
 significant regression in performance or client stability.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index eee1c6877851..86833b725bb5 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -133,6 +133,7 @@ struct rpc_xprt;
 struct rpc_xprt_ops {
         void            (*set_buffer_size)(struct rpc_xprt *xprt);
         int             (*reserve_xprt)(struct rpc_task *task);
+        void            (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
         void            (*connect)(struct rpc_task *task);
         int             (*send_request)(struct rpc_task *task);
         void            (*set_retrans_timeout)(struct rpc_task *task);
@@ -238,6 +239,8 @@ int			xprt_reserve_xprt_cong(struct rpc_task *task);
 int                     xprt_prepare_transmit(struct rpc_task *task);
 void                    xprt_transmit(struct rpc_task *task);
 int                     xprt_adjust_timeout(struct rpc_rqst *req);
+void                    xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
+void                    xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 void                    xprt_release(struct rpc_task *task);
 int                     xprt_destroy(struct rpc_xprt *xprt);