1 files changed, 811 insertions, 0 deletions

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
new file mode 100644
index 000000000..346ed1617
--- /dev/null
+++ b/fs/lockd/svc.c
@@ -0,0 +1,811 @@
+/*
+ * linux/fs/lockd/svc.c
+ *
+ * This is the central lockd service.
+ *
+ * FIXME: Separate the lockd NFS server functionality from the lockd NFS
+ * 	  client functionality. Oh why didn't Sun create two separate
+ *	  services in the first place?
+ *
+ * Authors:	Olaf Kirch (okir@monad.swb.de)
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched/signal.h>
+#include <linux/errno.h>
+#include <linux/in.h>
+#include <linux/uio.h>
+#include <linux/smp.h>
+#include <linux/mutex.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/inetdevice.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/svc_xprt.h>
+#include <net/ip.h>
+#include <net/addrconf.h>
+#include <net/ipv6.h>
+#include <linux/lockd/lockd.h>
+#include <linux/nfs.h>
+
+#include "netns.h"
+#include "procfs.h"
+
+#define NLMDBG_FACILITY		NLMDBG_SVC
+#define LOCKD_BUFSIZE		(1024 + NLMSVC_XDRSIZE)
+#define ALLOWED_SIGS		(sigmask(SIGKILL))
+
+static struct svc_program	nlmsvc_program;
+
+const struct nlmsvc_binding	*nlmsvc_ops;
+EXPORT_SYMBOL_GPL(nlmsvc_ops);
+
+static DEFINE_MUTEX(nlmsvc_mutex);
+static unsigned int		nlmsvc_users;
+static struct task_struct	*nlmsvc_task;
+static struct svc_rqst		*nlmsvc_rqst;
+unsigned long			nlmsvc_timeout;
+
+static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
+
+unsigned int lockd_net_id;
+
+/*
+ * These can be set at insmod time (useful for NFS as root filesystem),
+ * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
+ */
+static unsigned long		nlm_grace_period;
+static unsigned long		nlm_timeout = LOCKD_DFLT_TIMEO;
+static int			nlm_udpport, nlm_tcpport;
+
+/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
+static unsigned int		nlm_max_connections = 1024;
+
+/*
+ * Constants needed for the sysctl interface.
+ */
+static const unsigned long	nlm_grace_period_min = 0;
+static const unsigned long	nlm_grace_period_max = 240;
+static const unsigned long	nlm_timeout_min = 3;
+static const unsigned long	nlm_timeout_max = 20;
+static const int		nlm_port_min = 0, nlm_port_max = 65535;
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table_header * nlm_sysctl_table;
+#endif
+
+static unsigned long get_lockd_grace_period(void)
+{
+	/* Note: nlm_timeout should always be nonzero */
+	if (nlm_grace_period)
+		return roundup(nlm_grace_period, nlm_timeout) * HZ;
+	else
+		return nlm_timeout * 5 * HZ;
+}
+
+static void grace_ender(struct work_struct *grace)
+{
+	struct delayed_work *dwork = to_delayed_work(grace);
+	struct lockd_net *ln = container_of(dwork, struct lockd_net,
+					    grace_period_end);
+
+	locks_end_grace(&ln->lockd_manager);
+}
+
+static void set_grace_period(struct net *net)
+{
+	unsigned long grace_period = get_lockd_grace_period();
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+	locks_start_grace(net, &ln->lockd_manager);
+	cancel_delayed_work_sync(&ln->grace_period_end);
+	schedule_delayed_work(&ln->grace_period_end, grace_period);
+}
+
+static void restart_grace(void)
+{
+	if (nlmsvc_ops) {
+		struct net *net = &init_net;
+		struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+		cancel_delayed_work_sync(&ln->grace_period_end);
+		locks_end_grace(&ln->lockd_manager);
+		nlmsvc_invalidate_all();
+		set_grace_period(net);
+	}
+}
+
+/*
+ * This is the lockd kernel thread
+ */
+static int
+lockd(void *vrqstp)
+{
+	int		err = 0;
+	struct svc_rqst *rqstp = vrqstp;
+	struct net *net = &init_net;
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+	/* try_to_freeze() is called from svc_recv() */
+	set_freezable();
+
+	/* Allow SIGKILL to tell lockd to drop all of its locks */
+	allow_signal(SIGKILL);
+
+	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
+
+	/*
+	 * The main request loop. We don't terminate until the last
+	 * NFS mount or NFS daemon has gone away.
+	 */
+	while (!kthread_should_stop()) {
+		long timeout = MAX_SCHEDULE_TIMEOUT;
+		RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+		/* update sv_maxconn if it has changed */
+		rqstp->rq_server->sv_maxconn = nlm_max_connections;
+
+		if (signalled()) {
+			flush_signals(current);
+			restart_grace();
+			continue;
+		}
+
+		timeout = nlmsvc_retry_blocked();
+
+		/*
+		 * Find a socket with data available and call its
+		 * recvfrom routine.
+		 */
+		err = svc_recv(rqstp, timeout);
+		if (err == -EAGAIN || err == -EINTR)
+			continue;
+		dprintk("lockd: request from %s\n",
+				svc_print_addr(rqstp, buf, sizeof(buf)));
+
+		svc_process(rqstp);
+	}
+	flush_signals(current);
+	if (nlmsvc_ops)
+		nlmsvc_invalidate_all();
+	nlm_shutdown_hosts();
+	cancel_delayed_work_sync(&ln->grace_period_end);
+	locks_end_grace(&ln->lockd_manager);
+	return 0;
+}
+
+static int create_lockd_listener(struct svc_serv *serv, const char *name,
+				 struct net *net, const int family,
+				 const unsigned short port)
+{
+	struct svc_xprt *xprt;
+
+	xprt = svc_find_xprt(serv, name, net, family, 0);
+	if (xprt == NULL)
+		return svc_create_xprt(serv, name, net, family, port,
+						SVC_SOCK_DEFAULTS);
+	svc_xprt_put(xprt);
+	return 0;
+}
+
+static int create_lockd_family(struct svc_serv *serv, struct net *net,
+			       const int family)
+{
+	int err;
+
+	err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
+	if (err < 0)
+		return err;
+
+	return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
+}
+
+/*
+ * Ensure there are active UDP and TCP listeners for lockd.
+ *
+ * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
+ * local services (such as rpc.statd) still require UDP, and
+ * some NFS servers do not yet support NLM over TCP.
+ *
+ * Returns zero if all listeners are available; otherwise a
+ * negative errno value is returned.
+ */
+static int make_socks(struct svc_serv *serv, struct net *net)
+{
+	static int warned;
+	int err;
+
+	err = create_lockd_family(serv, net, PF_INET);
+	if (err < 0)
+		goto out_err;
+
+	err = create_lockd_family(serv, net, PF_INET6);
+	if (err < 0 && err != -EAFNOSUPPORT)
+		goto out_err;
+
+	warned = 0;
+	return 0;
+
+out_err:
+	if (warned++ == 0)
+		printk(KERN_WARNING
+			"lockd_up: makesock failed, error=%d\n", err);
+	svc_shutdown_net(serv, net);
+	return err;
+}
+
+static int lockd_up_net(struct svc_serv *serv, struct net *net)
+{
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+	int error;
+
+	if (ln->nlmsvc_users++)
+		return 0;
+
+	error = svc_bind(serv, net);
+	if (error)
+		goto err_bind;
+
+	error = make_socks(serv, net);
+	if (error < 0)
+		goto err_bind;
+	set_grace_period(net);
+	dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
+	return 0;
+
+err_bind:
+	ln->nlmsvc_users--;
+	return error;
+}
+
+static void lockd_down_net(struct svc_serv *serv, struct net *net)
+{
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+	if (ln->nlmsvc_users) {
+		if (--ln->nlmsvc_users == 0) {
+			nlm_shutdown_hosts_net(net);
+			cancel_delayed_work_sync(&ln->grace_period_end);
+			locks_end_grace(&ln->lockd_manager);
+			svc_shutdown_net(serv, net);
+			dprintk("%s: per-net data destroyed; net=%x\n",
+				__func__, net->ns.inum);
+		}
+	} else {
+		pr_err("%s: no users! task=%p, net=%x\n",
+			__func__, nlmsvc_task, net->ns.inum);
+		BUG();
+	}
+}
+
+static int lockd_inetaddr_event(struct notifier_block *this,
+	unsigned long event, void *ptr)
+{
+	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
+	struct sockaddr_in sin;
+
+	if ((event != NETDEV_DOWN) ||
+	    !atomic_inc_not_zero(&nlm_ntf_refcnt))
+		goto out;
+
+	if (nlmsvc_rqst) {
+		dprintk("lockd_inetaddr_event: removed %pI4\n",
+			&ifa->ifa_local);
+		sin.sin_family = AF_INET;
+		sin.sin_addr.s_addr = ifa->ifa_local;
+		svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
+			(struct sockaddr *)&sin);
+	}
+	atomic_dec(&nlm_ntf_refcnt);
+	wake_up(&nlm_ntf_wq);
+
+out:
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block lockd_inetaddr_notifier = {
+	.notifier_call = lockd_inetaddr_event,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int lockd_inet6addr_event(struct notifier_block *this,
+	unsigned long event, void *ptr)
+{
+	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
+	struct sockaddr_in6 sin6;
+
+	if ((event != NETDEV_DOWN) ||
+	    !atomic_inc_not_zero(&nlm_ntf_refcnt))
+		goto out;
+
+	if (nlmsvc_rqst) {
+		dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
+		sin6.sin6_family = AF_INET6;
+		sin6.sin6_addr = ifa->addr;
+		if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+			sin6.sin6_scope_id = ifa->idev->dev->ifindex;
+		svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
+			(struct sockaddr *)&sin6);
+	}
+	atomic_dec(&nlm_ntf_refcnt);
+	wake_up(&nlm_ntf_wq);
+
+out:
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block lockd_inet6addr_notifier = {
+	.notifier_call = lockd_inet6addr_event,
+};
+#endif
+
+static void lockd_unregister_notifiers(void)
+{
+	unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
+#if IS_ENABLED(CONFIG_IPV6)
+	unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
+#endif
+	wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
+}
+
+static void lockd_svc_exit_thread(void)
+{
+	atomic_dec(&nlm_ntf_refcnt);
+	lockd_unregister_notifiers();
+	svc_exit_thread(nlmsvc_rqst);
+}
+
+static int lockd_start_svc(struct svc_serv *serv)
+{
+	int error;
+
+	if (nlmsvc_rqst)
+		return 0;
+
+	/*
+	 * Create the kernel thread and wait for it to start.
+	 */
+	nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
+	if (IS_ERR(nlmsvc_rqst)) {
+		error = PTR_ERR(nlmsvc_rqst);
+		printk(KERN_WARNING
+			"lockd_up: svc_rqst allocation failed, error=%d\n",
+			error);
+		lockd_unregister_notifiers();
+		goto out_rqst;
+	}
+
+	atomic_inc(&nlm_ntf_refcnt);
+	svc_sock_update_bufs(serv);
+	serv->sv_maxconn = nlm_max_connections;
+
+	nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
+	if (IS_ERR(nlmsvc_task)) {
+		error = PTR_ERR(nlmsvc_task);
+		printk(KERN_WARNING
+			"lockd_up: kthread_run failed, error=%d\n", error);
+		goto out_task;
+	}
+	nlmsvc_rqst->rq_task = nlmsvc_task;
+	wake_up_process(nlmsvc_task);
+
+	dprintk("lockd_up: service started\n");
+	return 0;
+
+out_task:
+	lockd_svc_exit_thread();
+	nlmsvc_task = NULL;
+out_rqst:
+	nlmsvc_rqst = NULL;
+	return error;
+}
+
+static const struct svc_serv_ops lockd_sv_ops = {
+	.svo_shutdown		= svc_rpcb_cleanup,
+	.svo_enqueue_xprt	= svc_xprt_do_enqueue,
+};
+
+static struct svc_serv *lockd_create_svc(void)
+{
+	struct svc_serv *serv;
+
+	/*
+	 * Check whether we're already up and running.
+	 */
+	if (nlmsvc_rqst) {
+		/*
+		 * Note: increase service usage, because later in case of error
+		 * svc_destroy() will be called.
+		 */
+		svc_get(nlmsvc_rqst->rq_server);
+		return nlmsvc_rqst->rq_server;
+	}
+
+	/*
+	 * Sanity check: if there's no pid,
+	 * we should be the first user ...
+	 */
+	if (nlmsvc_users)
+		printk(KERN_WARNING
+			"lockd_up: no pid, %d users??\n", nlmsvc_users);
+
+	if (!nlm_timeout)
+		nlm_timeout = LOCKD_DFLT_TIMEO;
+	nlmsvc_timeout = nlm_timeout * HZ;
+
+	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
+	if (!serv) {
+		printk(KERN_WARNING "lockd_up: create service failed\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	register_inetaddr_notifier(&lockd_inetaddr_notifier);
+#if IS_ENABLED(CONFIG_IPV6)
+	register_inet6addr_notifier(&lockd_inet6addr_notifier);
+#endif
+	dprintk("lockd_up: service created\n");
+	return serv;
+}
+
+/*
+ * Bring up the lockd process if it's not already up.
+ */
+int lockd_up(struct net *net)
+{
+	struct svc_serv *serv;
+	int error;
+
+	mutex_lock(&nlmsvc_mutex);
+
+	serv = lockd_create_svc();
+	if (IS_ERR(serv)) {
+		error = PTR_ERR(serv);
+		goto err_create;
+	}
+
+	error = lockd_up_net(serv, net);
+	if (error < 0) {
+		lockd_unregister_notifiers();
+		goto err_put;
+	}
+
+	error = lockd_start_svc(serv);
+	if (error < 0) {
+		lockd_down_net(serv, net);
+		goto err_put;
+	}
+	nlmsvc_users++;
+	/*
+	 * Note: svc_serv structures have an initial use count of 1,
+	 * so we exit through here on both success and failure.
+	 */
+err_put:
+	svc_destroy(serv);
+err_create:
+	mutex_unlock(&nlmsvc_mutex);
+	return error;
+}
+EXPORT_SYMBOL_GPL(lockd_up);
+
+/*
+ * Decrement the user count and bring down lockd if we're the last.
+ */
+void
+lockd_down(struct net *net)
+{
+	mutex_lock(&nlmsvc_mutex);
+	lockd_down_net(nlmsvc_rqst->rq_server, net);
+	if (nlmsvc_users) {
+		if (--nlmsvc_users)
+			goto out;
+	} else {
+		printk(KERN_ERR "lockd_down: no users! task=%p\n",
+			nlmsvc_task);
+		BUG();
+	}
+
+	if (!nlmsvc_task) {
+		printk(KERN_ERR "lockd_down: no lockd running.\n");
+		BUG();
+	}
+	kthread_stop(nlmsvc_task);
+	dprintk("lockd_down: service stopped\n");
+	lockd_svc_exit_thread();
+	dprintk("lockd_down: service destroyed\n");
+	nlmsvc_task = NULL;
+	nlmsvc_rqst = NULL;
+out:
+	mutex_unlock(&nlmsvc_mutex);
+}
+EXPORT_SYMBOL_GPL(lockd_down);
+
+#ifdef CONFIG_SYSCTL
+
+/*
+ * Sysctl parameters (same as module parameters, different interface).
+ */
+
+static struct ctl_table nlm_sysctls[] = {
+	{
+		.procname	= "nlm_grace_period",
+		.data		= &nlm_grace_period,
+		.maxlen		= sizeof(unsigned long),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+		.extra1		= (unsigned long *) &nlm_grace_period_min,
+		.extra2		= (unsigned long *) &nlm_grace_period_max,
+	},
+	{
+		.procname	= "nlm_timeout",
+		.data		= &nlm_timeout,
+		.maxlen		= sizeof(unsigned long),
+		.mode		= 0644,
+		.proc_handler	= proc_doulongvec_minmax,
+		.extra1		= (unsigned long *) &nlm_timeout_min,
+		.extra2		= (unsigned long *) &nlm_timeout_max,
+	},
+	{
+		.procname	= "nlm_udpport",
+		.data		= &nlm_udpport,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= (int *) &nlm_port_min,
+		.extra2		= (int *) &nlm_port_max,
+	},
+	{
+		.procname	= "nlm_tcpport",
+		.data		= &nlm_tcpport,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= (int *) &nlm_port_min,
+		.extra2		= (int *) &nlm_port_max,
+	},
+	{
+		.procname	= "nsm_use_hostnames",
+		.data		= &nsm_use_hostnames,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "nsm_local_state",
+		.data		= &nsm_local_state,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{ }
+};
+
+static struct ctl_table nlm_sysctl_dir[] = {
+	{
+		.procname	= "nfs",
+		.mode		= 0555,
+		.child		= nlm_sysctls,
+	},
+	{ }
+};
+
+static struct ctl_table nlm_sysctl_root[] = {
+	{
+		.procname	= "fs",
+		.mode		= 0555,
+		.child		= nlm_sysctl_dir,
+	},
+	{ }
+};
+
+#endif	/* CONFIG_SYSCTL */
+
+/*
+ * Module (and sysfs) parameters.
+ */
+
+#define param_set_min_max(name, type, which_strtol, min, max)		\
+static int param_set_##name(const char *val, const struct kernel_param *kp) \
+{									\
+	char *endp;							\
+	__typeof__(type) num = which_strtol(val, &endp, 0);		\
+	if (endp == val || *endp || num < (min) || num > (max))		\
+		return -EINVAL;						\
+	*((type *) kp->arg) = num;					\
+	return 0;							\
+}
+
+static inline int is_callback(u32 proc)
+{
+	return proc == NLMPROC_GRANTED
+		|| proc == NLMPROC_GRANTED_MSG
+		|| proc == NLMPROC_TEST_RES
+		|| proc == NLMPROC_LOCK_RES
+		|| proc == NLMPROC_CANCEL_RES
+		|| proc == NLMPROC_UNLOCK_RES
+		|| proc == NLMPROC_NSM_NOTIFY;
+}
+
+
+static int lockd_authenticate(struct svc_rqst *rqstp)
+{
+	rqstp->rq_client = NULL;
+	switch (rqstp->rq_authop->flavour) {
+		case RPC_AUTH_NULL:
+		case RPC_AUTH_UNIX:
+			if (rqstp->rq_proc == 0)
+				return SVC_OK;
+			if (is_callback(rqstp->rq_proc)) {
+				/* Leave it to individual procedures to
+				 * call nlmsvc_lookup_host(rqstp)
+				 */
+				return SVC_OK;
+			}
+			return svc_set_client(rqstp);
+	}
+	return SVC_DENIED;
+}
+
+
+param_set_min_max(port, int, simple_strtol, 0, 65535)
+param_set_min_max(grace_period, unsigned long, simple_strtoul,
+		  nlm_grace_period_min, nlm_grace_period_max)
+param_set_min_max(timeout, unsigned long, simple_strtoul,
+		  nlm_timeout_min, nlm_timeout_max)
+
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
+MODULE_LICENSE("GPL");
+
+module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
+		  &nlm_grace_period, 0644);
+module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
+		  &nlm_timeout, 0644);
+module_param_call(nlm_udpport, param_set_port, param_get_int,
+		  &nlm_udpport, 0644);
+module_param_call(nlm_tcpport, param_set_port, param_get_int,
+		  &nlm_tcpport, 0644);
+module_param(nsm_use_hostnames, bool, 0644);
+module_param(nlm_max_connections, uint, 0644);
+
+static int lockd_init_net(struct net *net)
+{
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+	INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
+	INIT_LIST_HEAD(&ln->lockd_manager.list);
+	ln->lockd_manager.block_opens = false;
+	INIT_LIST_HEAD(&ln->nsm_handles);
+	return 0;
+}
+
+static void lockd_exit_net(struct net *net)
+{
+	struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+	WARN_ONCE(!list_empty(&ln->lockd_manager.list),
+		  "net %x %s: lockd_manager.list is not empty\n",
+		  net->ns.inum, __func__);
+	WARN_ONCE(!list_empty(&ln->nsm_handles),
+		  "net %x %s: nsm_handles list is not empty\n",
+		  net->ns.inum, __func__);
+	WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
+		  "net %x %s: grace_period_end was not cancelled\n",
+		  net->ns.inum, __func__);
+}
+
+static struct pernet_operations lockd_net_ops = {
+	.init = lockd_init_net,
+	.exit = lockd_exit_net,
+	.id = &lockd_net_id,
+	.size = sizeof(struct lockd_net),
+};
+
+
+/*
+ * Initialising and terminating the module.
+ */
+
+static int __init init_nlm(void)
+{
+	int err;
+
+#ifdef CONFIG_SYSCTL
+	err = -ENOMEM;
+	nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
+	if (nlm_sysctl_table == NULL)
+		goto err_sysctl;
+#endif
+	err = register_pernet_subsys(&lockd_net_ops);
+	if (err)
+		goto err_pernet;
+
+	err = lockd_create_procfs();
+	if (err)
+		goto err_procfs;
+
+	return 0;
+
+err_procfs:
+	unregister_pernet_subsys(&lockd_net_ops);
+err_pernet:
+#ifdef CONFIG_SYSCTL
+	unregister_sysctl_table(nlm_sysctl_table);
+err_sysctl:
+#endif
+	return err;
+}
+
+static void __exit exit_nlm(void)
+{
+	/* FIXME: delete all NLM clients */
+	nlm_shutdown_hosts();
+	lockd_remove_procfs();
+	unregister_pernet_subsys(&lockd_net_ops);
+#ifdef CONFIG_SYSCTL
+	unregister_sysctl_table(nlm_sysctl_table);
+#endif
+}
+
+module_init(init_nlm);
+module_exit(exit_nlm);
+
+/*
+ * Define NLM program and procedures
+ */
+static unsigned int nlmsvc_version1_count[17];
+static const struct svc_version	nlmsvc_version1 = {
+	.vs_vers	= 1,
+	.vs_nproc	= 17,
+	.vs_proc	= nlmsvc_procedures,
+	.vs_count	= nlmsvc_version1_count,
+	.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+static unsigned int nlmsvc_version3_count[24];
+static const struct svc_version	nlmsvc_version3 = {
+	.vs_vers	= 3,
+	.vs_nproc	= 24,
+	.vs_proc	= nlmsvc_procedures,
+	.vs_count	= nlmsvc_version3_count,
+	.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+#ifdef CONFIG_LOCKD_V4
+static unsigned int nlmsvc_version4_count[24];
+static const struct svc_version	nlmsvc_version4 = {
+	.vs_vers	= 4,
+	.vs_nproc	= 24,
+	.vs_proc	= nlmsvc_procedures4,
+	.vs_count	= nlmsvc_version4_count,
+	.vs_xdrsize	= NLMSVC_XDRSIZE,
+};
+#endif
+static const struct svc_version *nlmsvc_version[] = {
+	[1] = &nlmsvc_version1,
+	[3] = &nlmsvc_version3,
+#ifdef CONFIG_LOCKD_V4
+	[4] = &nlmsvc_version4,
+#endif
+};
+
+static struct svc_stat		nlmsvc_stats;
+
+#define NLM_NRVERS	ARRAY_SIZE(nlmsvc_version)
+static struct svc_program	nlmsvc_program = {
+	.pg_prog		= NLM_PROGRAM,		/* program number */
+	.pg_nvers		= NLM_NRVERS,		/* number of entries in nlmsvc_version */
+	.pg_vers		= nlmsvc_version,	/* version table */
+	.pg_name		= "lockd",		/* service name */
+	.pg_class		= "nfsd",		/* share authentication with nfsd */
+	.pg_stats		= &nlmsvc_stats,	/* stats table */
+	.pg_authenticate = &lockd_authenticate	/* export authentication */
+};