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authorTom Talpey <tmtalpey@gmail.com>2009-03-11 21:37:56 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-03-11 21:37:56 +0300
commit441e3e242903f9b190d5764bed73edb58f977413 (patch)
tree3898c80feadee3cdeb3c99cb7d62861127f1b4ef /net/sunrpc/xprt.c
parentb38ab40ad58c1fc43ea590d6342f6a6763ac8fb6 (diff)
downloadlinux-441e3e242903f9b190d5764bed73edb58f977413.tar.xz
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>
Diffstat (limited to 'net/sunrpc/xprt.c')
-rw-r--r--net/sunrpc/xprt.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 62098d101a1f..d1afec640394 100644
--- 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
*