SUNRPC: dynamically load RPC transport modules on-demand

[safe/jmp/linux-2.6] / net / sunrpc / xprt.c

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 62098d1..d1afec6 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -152,6 +152,37 @@ out:
 EXPORT_SYMBOL_GPL(xprt_unregister_transport);
 
 /**
+ * xprt_load_transport - load a transport implementation
+ * @transport_name: transport to load
+ *
+ * Returns:
+ * 0:          transport successfully loaded
+ * -ENOENT:    transport module not available
+ */
+int xprt_load_transport(const char *transport_name)
+{
+       struct xprt_class *t;
+       char module_name[sizeof t->name + 5];
+       int result;
+
+       result = 0;
+       spin_lock(&xprt_list_lock);
+       list_for_each_entry(t, &xprt_list, list) {
+               if (strcmp(t->name, transport_name) == 0) {
+                       spin_unlock(&xprt_list_lock);
+                       goto out;
+               }
+       }
+       spin_unlock(&xprt_list_lock);
+       strcpy(module_name, "xprt");
+       strncat(module_name, transport_name, sizeof t->name);
+       result = request_module(module_name);
+out:
+       return result;
+}
+EXPORT_SYMBOL_GPL(xprt_load_transport);
+
+/**
  * xprt_reserve_xprt - serialize write access to transports
  * @task: task that is requesting access to the transport
  *