nfsd4: introduce nfs4_client.cl_refcount

Currently just initialize the cl_refcount to 1
and decrement in expire_client(), conditionally freeing the
client when the refcount reaches 0.

To be used later by nfsv4.1 compounds to keep the client from
timing out while in use.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 98836fd87f69..ee42a0beecfa 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -233,6 +233,8 @@ struct nfs4_client {
         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
         u32                     cl_exchange_flags;
         struct nfs4_sessionid   cl_sessionid;
+        /* number of rpc's in progress over an associated session: */
+        atomic_t                cl_refcount;
 
         /* for nfs41 callbacks */
         /* We currently support a single back channel with a single slot */