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, 3 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index dede43c37336..e439a882e0c2 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -740,8 +740,9 @@ expire_client(struct nfs4_client *clp)
         list_del(&clp->cl_strhash);
         spin_lock(&client_lock);
         unhash_client_locked(clp);
+        if (atomic_read(&clp->cl_refcount) == 0)
+                free_client(clp);
         spin_unlock(&client_lock);
-        free_client(clp);
 }
 
 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
@@ -827,6 +828,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
         }
 
         memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
+        atomic_set(&clp->cl_refcount, 0);
         atomic_set(&clp->cl_cb_set, 0);
         INIT_LIST_HEAD(&clp->cl_idhash);
         INIT_LIST_HEAD(&clp->cl_strhash);