svc: Add a generic transport svc_create_xprt function

The svc_create_xprt function is a transport independent version
of the svc_makesock function.

Since transport instance creation contains transport dependent and
independent components, add an xpo_create transport function. The
transport implementation of this function allocates the memory for the
endpoint, implements the transport dependent initialization logic, and
calls svc_xprt_init to initialize the transport independent field (svc_xprt)
in it's data structure.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 37 insertions, 0 deletions

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index fe5270fae336..6ff5ca71602f 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -81,3 +81,40 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt)
         xprt->xpt_ops = xcl->xcl_ops;
 }
 EXPORT_SYMBOL_GPL(svc_xprt_init);
+
+int svc_create_xprt(struct svc_serv *serv, char *xprt_name, unsigned short port,
+                    int flags)
+{
+        struct svc_xprt_class *xcl;
+        int ret = -ENOENT;
+        struct sockaddr_in sin = {
+                .sin_family             = AF_INET,
+                .sin_addr.s_addr        = INADDR_ANY,
+                .sin_port               = htons(port),
+        };
+        dprintk("svc: creating transport %s[%d]\n", xprt_name, port);
+        spin_lock(&svc_xprt_class_lock);
+        list_for_each_entry(xcl, &svc_xprt_class_list, xcl_list) {
+                if (strcmp(xprt_name, xcl->xcl_name) == 0) {
+                        spin_unlock(&svc_xprt_class_lock);
+                        if (try_module_get(xcl->xcl_owner)) {
+                                struct svc_xprt *newxprt;
+                                ret = 0;
+                                newxprt = xcl->xcl_ops->xpo_create
+                                        (serv,
+                                         (struct sockaddr *)&sin, sizeof(sin),
+                                         flags);
+                                if (IS_ERR(newxprt)) {
+                                        module_put(xcl->xcl_owner);
+                                        ret = PTR_ERR(newxprt);
+                                }
+                        }
+                        goto out;
+                }
+        }
+        spin_unlock(&svc_xprt_class_lock);
+        dprintk("svc: transport %s not found\n", xprt_name);
+ out:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(svc_create_xprt);