nfsd: Remove callback_cred

Clean up: The global callback_cred is no longer used, so it can be
removed.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4callback.c

@@ -746,26 +746,6 @@ static int max_cb_time(struct net *net)
 	return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
 }
 
-static struct rpc_cred *callback_cred;
-
-int set_callback_cred(void)
-{
-	if (callback_cred)
-		return 0;
-	callback_cred = rpc_lookup_machine_cred("nfs");
-	if (!callback_cred)
-		return -ENOMEM;
-	return 0;
-}
-
-void cleanup_callback_cred(void)
-{
-	if (callback_cred) {
-		put_rpccred(callback_cred);
-		callback_cred = NULL;
-	}
-}
-
 static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
 {
 	if (clp->cl_minorversion == 0) {

fs/nfsd/nfs4state.c

@@ -7231,14 +7231,10 @@ nfs4_state_start(void)
 {
 	int ret;
 
-	ret = set_callback_cred();
-	if (ret)
-		return ret;
-
 	laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
 	if (laundry_wq == NULL) {
 		ret = -ENOMEM;
-		goto out_cleanup_cred;
+		goto out;
 	}
 	ret = nfsd4_create_callback_queue();
 	if (ret)
@@ -7249,8 +7245,7 @@ nfs4_state_start(void)
 
 out_free_laundry:
 	destroy_workqueue(laundry_wq);
-out_cleanup_cred:
-	cleanup_callback_cred();
+out:
 	return ret;
 }
 
@@ -7287,7 +7282,6 @@ nfs4_state_shutdown(void)
 {
 	destroy_workqueue(laundry_wq);
 	nfsd4_destroy_callback_queue();
-	cleanup_callback_cred();
 }
 
 static void

fs/nfsd/state.h

@@ -617,8 +617,6 @@ extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
 							struct nfsd_net *nn);
 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
 		struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
-extern int set_callback_cred(void);
-extern void cleanup_callback_cred(void);
 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);