SUNRPC: Add the helper function 'rpc_call_null()'

Does a NULL RPC call and returns a pointer to the resulting rpc_task. The
call may be either synchronous or asynchronous.

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

2 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index a0e51e193284..097984b03857 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -130,6 +130,8 @@ int		rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg,
                                void *calldata);
 int             rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg,
                               int flags);
+struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
+                               int flags);
 void            rpc_restart_call(struct rpc_task *);
 void            rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset);
 void            rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset);
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 4e91f3110938..5a28ffac99ea 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1455,6 +1455,16 @@ static int rpc_ping(struct rpc_clnt *clnt, int flags)
         return err;
 }
 
+struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int flags)
+{
+        struct rpc_message msg = {
+                .rpc_proc = &rpcproc_null,
+                .rpc_cred = cred,
+        };
+        return rpc_do_run_task(clnt, &msg, flags, &rpc_default_ops, NULL);
+}
+EXPORT_SYMBOL(rpc_call_null);
+
 #ifdef RPC_DEBUG
 void rpc_show_tasks(void)
 {