SUNRPC: new interface to force an RPC rebind

 We'd like to hide fields in rpc_xprt and rpc_clnt from upper layer protocols.
 Start by creating an API to force RPC rebind, replacing logic that simply
 sets cl_port to zero.

 Test-plan:
 Destructive testing (unplugging the network temporarily).  Connectathon
 with UDP and TCP.  NFSv2/3 and NFSv4 mounting should be carefully checked.
 Probably need to rig a server where certain services aren't running, or
 that returns an error for some typical operation.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index c4c8601096e0..82f7a0b1d8ae 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -177,7 +177,7 @@ nlm_bind_host(struct nlm_host *host)
         if ((clnt = host->h_rpcclnt) != NULL) {
                 xprt = clnt->cl_xprt;
                 if (time_after_eq(jiffies, host->h_nextrebind)) {
-                        clnt->cl_port = 0;
+                        rpc_force_rebind(clnt);
                         host->h_nextrebind = jiffies + NLM_HOST_REBIND;
                         dprintk("lockd: next rebind in %ld jiffies\n",
                                         host->h_nextrebind - jiffies);
@@ -217,7 +217,7 @@ nlm_rebind_host(struct nlm_host *host)
 {
         dprintk("lockd: rebind host %s\n", host->h_name);
         if (host->h_rpcclnt && time_after_eq(jiffies, host->h_nextrebind)) {
-                host->h_rpcclnt->cl_port = 0;
+                rpc_force_rebind(host->h_rpcclnt);
                 host->h_nextrebind = jiffies + NLM_HOST_REBIND;
         }
 }