nfs41: Setup the backchannel

The NFS v4.1 callback service has already been setup, and
rpc_xprt->serv points to the svc_serv structure describing it.
Invoke the xprt_setup_backchannel() initialization to pre-
allocate the necessary backchannel structures.

Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: change nfs4_put_session(nfs4_session**) to nfs4_destroy_session(nfs_session*)]
Signed-off-by: Alexandros Batsakis <Alexandros.Batsakis@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[moved xprt_setup_backchannel from nfs4_init_session to nfs4_init_backchannel]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index ac6575c4da31..4f75ec593be8 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -37,6 +37,7 @@
 #include <linux/in6.h>
 #include <net/ipv6.h>
 #include <linux/nfs_xdr.h>
+#include <linux/sunrpc/bc_xprt.h>
 
 #include <asm/system.h>
 
@@ -1096,6 +1097,14 @@ static int nfs4_init_callback(struct nfs_client *clp)
         int error;
 
         if (clp->rpc_ops->version == 4) {
+                if (nfs4_has_session(clp)) {
+                        error = xprt_setup_backchannel(
+                                                clp->cl_rpcclient->cl_xprt,
+                                                NFS41_BC_MIN_CALLBACKS);
+                        if (error < 0)
+                                return error;
+                }
+
                 error = nfs_callback_up(clp->cl_minorversion,
                                         clp->cl_rpcclient->cl_xprt);
                 if (error < 0) {