nfsd4: cl_count is unused

Now that the shutdown sequence guarantees callbacks are shut down before
the client is destroyed, we no longer have a use for cl_count.

We'll probably reinstate a reference count on the client some day, but
it will be held by users other than callbacks.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfs4callback.c

@@ -681,10 +681,8 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
 static void nfsd4_cb_recall_release(void *calldata)
 {
 	struct nfs4_delegation *dp = calldata;
-	struct nfs4_client *clp = dp->dl_client;
 
 	nfs4_put_delegation(dp);
-	put_nfs4_client(clp);
 }
 
 static const struct rpc_call_ops nfsd4_cb_recall_ops = {
@@ -746,10 +744,8 @@ static void _nfsd4_cb_recall(struct nfs4_delegation *dp)
 	dp->dl_retries = 1;
 	status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
 				&nfsd4_cb_recall_ops, dp);
-	if (status) {
-		put_nfs4_client(clp);
+	if (status)
 		nfs4_put_delegation(dp);
-	}
 }
 
 void nfsd4_do_callback_rpc(struct work_struct *w)

fs/nfsd/nfs4state.c

@@ -690,13 +690,6 @@ free_client(struct nfs4_client *clp)
 	kfree(clp);
 }
 
-void
-put_nfs4_client(struct nfs4_client *clp)
-{
-	if (atomic_dec_and_test(&clp->cl_count))
-		free_client(clp);
-}
-
 static void
 expire_client(struct nfs4_client *clp)
 {
@@ -735,7 +728,7 @@ expire_client(struct nfs4_client *clp)
 	nfsd4_set_callback_client(clp, NULL);
 	if (clp->cl_cb_xprt)
 		svc_xprt_put(clp->cl_cb_xprt);
-	put_nfs4_client(clp);
+	free_client(clp);
 }
 
 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
@@ -821,7 +814,6 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
 	}
 
 	memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
-	atomic_set(&clp->cl_count, 1);
 	atomic_set(&clp->cl_cb_conn.cb_set, 0);
 	INIT_LIST_HEAD(&clp->cl_idhash);
 	INIT_LIST_HEAD(&clp->cl_strhash);
@@ -2010,7 +2002,6 @@ void nfsd_break_deleg_cb(struct file_lock *fl)
 	 * lock) we know the server hasn't removed the lease yet, we know
 	 * it's safe to take a reference: */
 	atomic_inc(&dp->dl_count);
-	atomic_inc(&dp->dl_client->cl_count);
 
 	spin_lock(&recall_lock);
 	list_add_tail(&dp->dl_recall_lru, &del_recall_lru);

fs/nfsd/state.h

@@ -224,7 +224,6 @@ struct nfs4_client {
 	clientid_t		cl_clientid;	/* generated by server */
 	nfs4_verifier		cl_confirm;	/* generated by server */
 	struct nfs4_cb_conn	cl_cb_conn;     /* callback info */
-	atomic_t		cl_count;	/* ref count */
 	u32			cl_firststate;	/* recovery dir creation */
 
 	/* for nfs41 */
@@ -388,7 +387,6 @@ extern void nfs4_lock_state(void);
 extern void nfs4_unlock_state(void);
 extern int nfs4_in_grace(void);
 extern __be32 nfs4_check_open_reclaim(clientid_t *clid);
-extern void put_nfs4_client(struct nfs4_client *clp);
 extern void nfs4_free_stateowner(struct kref *kref);
 extern int set_callback_cred(void);
 extern void nfsd4_probe_callback(struct nfs4_client *clp);