SUNRPC: dynamically load RPC transport modules on-demand

Provide an api to attempt to load any necessary kernel RPC
client transport module automatically. By convention, the
desired module name is "xprt"+"transport name". For example,
when NFS mounting with "-o proto=rdma", attempt to load the
"xprtrdma" module.

Signed-off-by: Tom Talpey <tmtalpey@gmail.com>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 11fc71d..2b0d960 100644 (file)
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -235,6 +235,7 @@ static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *
  */
 int                    xprt_register_transport(struct xprt_class *type);
 int                    xprt_unregister_transport(struct xprt_class *type);
+int                    xprt_load_transport(const char *);
 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);

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
@@ -151,6 +151,37 @@ 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