nfsd: skip CB_NULL probes for 4.1 or later

With sessions in v4.1 or later we don't need to manually probe the backchannel
connection, so we can declare it up instantly after setting up the RPC client.

Note that we really should split nfsd4_run_cb_work in the long run, this is
just the least intrusive fix for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 4c993aaf1e6e54ef946434689bdcfa0613605e3c..5694cfb7a47b73a0d7128ed987cf1aaba6ea8859 100644 (file)
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -1066,6 +1066,15 @@ nfsd4_run_cb_work(struct work_struct *work)
                        cb->cb_ops->release(cb);
                return;
        }
+
+       /*
+        * Don't send probe messages for 4.1 or later.
+        */
+       if (!cb->cb_ops && clp->cl_minorversion) {
+               clp->cl_cb_state = NFSD4_CB_UP;
+               return;
+       }
+
        cb->cb_msg.rpc_cred = clp->cl_cb_cred;
        rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
                        cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);