SUNRPC: setup rpcbind clients if service requires it

New function ("svc_uses_rpcbind") will be used to detect, that new service will
send portmapper register calls. For such services we will create rpcbind
clients and remove all stale portmap registrations.
Also, svc_rpcb_cleanup() will be set as sv_shutdown callback for such services
in case of this field wasn't initialized earlier. This will allow to destroy
rpcbind clients when no other users of them left.

Note: Currently, any creating service will be detected as portmap user.
Probably, this is wrong. But now it depends on program versions "vs_hidden"
flag.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index d2d61bfa3306..918edc310fd1 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -454,8 +454,15 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
                 spin_lock_init(&pool->sp_lock);
         }
 
-        /* Remove any stale portmap registrations */
-        svc_unregister(serv);
+        if (svc_uses_rpcbind(serv)) {
+                if (svc_rpcb_setup(serv) < 0) {
+                        kfree(serv->sv_pools);
+                        kfree(serv);
+                        return NULL;
+                }
+                if (!serv->sv_shutdown)
+                        serv->sv_shutdown = svc_rpcb_cleanup;
+        }
 
         return serv;
 }