NFS: Enable client side NFSv4.1 backchannel to use other transports

Forechannel transports get their own "bc_up" method to create an
endpoint for the backchannel service.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
[Anna Schumaker: Add forward declaration of struct net to xprt.h]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 44a81e4c6783..dc4706711224 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1306,6 +1306,17 @@ static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
                 xs_tcp_read_reply(xprt, desc) :
                 xs_tcp_read_callback(xprt, desc);
 }
+
+static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
+{
+        int ret;
+
+        ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
+                              SVC_SOCK_ANONYMOUS);
+        if (ret < 0)
+                return ret;
+        return 0;
+}
 #else
 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
                                         struct xdr_skb_reader *desc)
@@ -2582,6 +2593,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
         .inject_disconnect      = xs_inject_disconnect,
 #ifdef CONFIG_SUNRPC_BACKCHANNEL
         .bc_setup               = xprt_setup_bc,
+        .bc_up                  = xs_tcp_bc_up,
         .bc_free_rqst           = xprt_free_bc_rqst,
         .bc_destroy             = xprt_destroy_bc,
 #endif