nfsd41: Backchannel: Server backchannel RPC wait queue

RPC callback requests will wait on this wait queue if the backchannel
is out of slots.

Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 0e5b5aecde03..9cc40a137c34 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -219,7 +219,11 @@ struct nfs4_client {
         struct nfs4_sessionid   cl_sessionid;
 
         /* for nfs41 callbacks */
+        /* We currently support a single back channel with a single slot */
+        unsigned long           cl_cb_slot_busy;
         struct svc_xprt         *cl_cb_xprt;    /* 4.1 callback transport */
+        struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
+                                                /* wait here for slots */
 };
 
 /* struct nfs4_client_reset