xref: /openbmc/linux/fs/lockd/svc.c (revision 032ed4c6)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/fs/lockd/svc.c
4  *
5  * This is the central lockd service.
6  *
7  * FIXME: Separate the lockd NFS server functionality from the lockd NFS
8  * 	  client functionality. Oh why didn't Sun create two separate
9  *	  services in the first place?
10  *
11  * Authors:	Olaf Kirch (okir@monad.swb.de)
12  *
13  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
14  */
15 
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sysctl.h>
19 #include <linux/moduleparam.h>
20 
21 #include <linux/sched/signal.h>
22 #include <linux/errno.h>
23 #include <linux/in.h>
24 #include <linux/uio.h>
25 #include <linux/smp.h>
26 #include <linux/mutex.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/inetdevice.h>
30 
31 #include <linux/sunrpc/types.h>
32 #include <linux/sunrpc/stats.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/svc.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/sunrpc/svc_xprt.h>
37 #include <net/ip.h>
38 #include <net/addrconf.h>
39 #include <net/ipv6.h>
40 #include <linux/lockd/lockd.h>
41 #include <linux/nfs.h>
42 
43 #include "netns.h"
44 #include "procfs.h"
45 
46 #define NLMDBG_FACILITY		NLMDBG_SVC
47 #define LOCKD_BUFSIZE		(1024 + NLMSVC_XDRSIZE)
48 
49 static struct svc_program	nlmsvc_program;
50 
51 const struct nlmsvc_binding	*nlmsvc_ops;
52 EXPORT_SYMBOL_GPL(nlmsvc_ops);
53 
54 static DEFINE_MUTEX(nlmsvc_mutex);
55 static unsigned int		nlmsvc_users;
56 static struct svc_serv		*nlmsvc_serv;
57 unsigned long			nlmsvc_timeout;
58 
nlmsvc_request_retry(struct timer_list * tl)59 static void nlmsvc_request_retry(struct timer_list *tl)
60 {
61 	svc_wake_up(nlmsvc_serv);
62 }
63 DEFINE_TIMER(nlmsvc_retry, nlmsvc_request_retry);
64 
65 unsigned int lockd_net_id;
66 
67 /*
68  * These can be set at insmod time (useful for NFS as root filesystem),
69  * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
70  */
71 static unsigned long		nlm_grace_period;
72 static unsigned long		nlm_timeout = LOCKD_DFLT_TIMEO;
73 static int			nlm_udpport, nlm_tcpport;
74 
75 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
76 static unsigned int		nlm_max_connections = 1024;
77 
78 /*
79  * Constants needed for the sysctl interface.
80  */
81 static const unsigned long	nlm_grace_period_min = 0;
82 static const unsigned long	nlm_grace_period_max = 240;
83 static const unsigned long	nlm_timeout_min = 3;
84 static const unsigned long	nlm_timeout_max = 20;
85 
86 #ifdef CONFIG_SYSCTL
87 static const int		nlm_port_min = 0, nlm_port_max = 65535;
88 static struct ctl_table_header * nlm_sysctl_table;
89 #endif
90 
get_lockd_grace_period(void)91 static unsigned long get_lockd_grace_period(void)
92 {
93 	/* Note: nlm_timeout should always be nonzero */
94 	if (nlm_grace_period)
95 		return roundup(nlm_grace_period, nlm_timeout) * HZ;
96 	else
97 		return nlm_timeout * 5 * HZ;
98 }
99 
grace_ender(struct work_struct * grace)100 static void grace_ender(struct work_struct *grace)
101 {
102 	struct delayed_work *dwork = to_delayed_work(grace);
103 	struct lockd_net *ln = container_of(dwork, struct lockd_net,
104 					    grace_period_end);
105 
106 	locks_end_grace(&ln->lockd_manager);
107 }
108 
set_grace_period(struct net * net)109 static void set_grace_period(struct net *net)
110 {
111 	unsigned long grace_period = get_lockd_grace_period();
112 	struct lockd_net *ln = net_generic(net, lockd_net_id);
113 
114 	locks_start_grace(net, &ln->lockd_manager);
115 	cancel_delayed_work_sync(&ln->grace_period_end);
116 	schedule_delayed_work(&ln->grace_period_end, grace_period);
117 }
118 
119 /*
120  * This is the lockd kernel thread
121  */
122 static int
lockd(void * vrqstp)123 lockd(void *vrqstp)
124 {
125 	struct svc_rqst *rqstp = vrqstp;
126 	struct net *net = &init_net;
127 	struct lockd_net *ln = net_generic(net, lockd_net_id);
128 
129 	/* try_to_freeze() is called from svc_recv() */
130 	set_freezable();
131 
132 	dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
133 
134 	/*
135 	 * The main request loop. We don't terminate until the last
136 	 * NFS mount or NFS daemon has gone away.
137 	 */
138 	while (!kthread_should_stop()) {
139 		/* update sv_maxconn if it has changed */
140 		rqstp->rq_server->sv_maxconn = nlm_max_connections;
141 
142 		nlmsvc_retry_blocked();
143 		svc_recv(rqstp);
144 	}
145 	if (nlmsvc_ops)
146 		nlmsvc_invalidate_all();
147 	nlm_shutdown_hosts();
148 	cancel_delayed_work_sync(&ln->grace_period_end);
149 	locks_end_grace(&ln->lockd_manager);
150 
151 	dprintk("lockd_down: service stopped\n");
152 
153 	svc_exit_thread(rqstp);
154 	return 0;
155 }
156 
create_lockd_listener(struct svc_serv * serv,const char * name,struct net * net,const int family,const unsigned short port,const struct cred * cred)157 static int create_lockd_listener(struct svc_serv *serv, const char *name,
158 				 struct net *net, const int family,
159 				 const unsigned short port,
160 				 const struct cred *cred)
161 {
162 	struct svc_xprt *xprt;
163 
164 	xprt = svc_find_xprt(serv, name, net, family, 0);
165 	if (xprt == NULL)
166 		return svc_xprt_create(serv, name, net, family, port,
167 				       SVC_SOCK_DEFAULTS, cred);
168 	svc_xprt_put(xprt);
169 	return 0;
170 }
171 
create_lockd_family(struct svc_serv * serv,struct net * net,const int family,const struct cred * cred)172 static int create_lockd_family(struct svc_serv *serv, struct net *net,
173 			       const int family, const struct cred *cred)
174 {
175 	int err;
176 
177 	err = create_lockd_listener(serv, "udp", net, family, nlm_udpport,
178 			cred);
179 	if (err < 0)
180 		return err;
181 
182 	return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport,
183 			cred);
184 }
185 
186 /*
187  * Ensure there are active UDP and TCP listeners for lockd.
188  *
189  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
190  * local services (such as rpc.statd) still require UDP, and
191  * some NFS servers do not yet support NLM over TCP.
192  *
193  * Returns zero if all listeners are available; otherwise a
194  * negative errno value is returned.
195  */
make_socks(struct svc_serv * serv,struct net * net,const struct cred * cred)196 static int make_socks(struct svc_serv *serv, struct net *net,
197 		const struct cred *cred)
198 {
199 	static int warned;
200 	int err;
201 
202 	err = create_lockd_family(serv, net, PF_INET, cred);
203 	if (err < 0)
204 		goto out_err;
205 
206 	err = create_lockd_family(serv, net, PF_INET6, cred);
207 	if (err < 0 && err != -EAFNOSUPPORT)
208 		goto out_err;
209 
210 	warned = 0;
211 	return 0;
212 
213 out_err:
214 	if (warned++ == 0)
215 		printk(KERN_WARNING
216 			"lockd_up: makesock failed, error=%d\n", err);
217 	svc_xprt_destroy_all(serv, net);
218 	svc_rpcb_cleanup(serv, net);
219 	return err;
220 }
221 
lockd_up_net(struct svc_serv * serv,struct net * net,const struct cred * cred)222 static int lockd_up_net(struct svc_serv *serv, struct net *net,
223 		const struct cred *cred)
224 {
225 	struct lockd_net *ln = net_generic(net, lockd_net_id);
226 	int error;
227 
228 	if (ln->nlmsvc_users++)
229 		return 0;
230 
231 	error = svc_bind(serv, net);
232 	if (error)
233 		goto err_bind;
234 
235 	error = make_socks(serv, net, cred);
236 	if (error < 0)
237 		goto err_bind;
238 	set_grace_period(net);
239 	dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
240 	return 0;
241 
242 err_bind:
243 	ln->nlmsvc_users--;
244 	return error;
245 }
246 
lockd_down_net(struct svc_serv * serv,struct net * net)247 static void lockd_down_net(struct svc_serv *serv, struct net *net)
248 {
249 	struct lockd_net *ln = net_generic(net, lockd_net_id);
250 
251 	if (ln->nlmsvc_users) {
252 		if (--ln->nlmsvc_users == 0) {
253 			nlm_shutdown_hosts_net(net);
254 			cancel_delayed_work_sync(&ln->grace_period_end);
255 			locks_end_grace(&ln->lockd_manager);
256 			svc_xprt_destroy_all(serv, net);
257 			svc_rpcb_cleanup(serv, net);
258 		}
259 	} else {
260 		pr_err("%s: no users! net=%x\n",
261 			__func__, net->ns.inum);
262 		BUG();
263 	}
264 }
265 
lockd_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)266 static int lockd_inetaddr_event(struct notifier_block *this,
267 	unsigned long event, void *ptr)
268 {
269 	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
270 	struct sockaddr_in sin;
271 
272 	if (event != NETDEV_DOWN)
273 		goto out;
274 
275 	if (nlmsvc_serv) {
276 		dprintk("lockd_inetaddr_event: removed %pI4\n",
277 			&ifa->ifa_local);
278 		sin.sin_family = AF_INET;
279 		sin.sin_addr.s_addr = ifa->ifa_local;
280 		svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin);
281 	}
282 
283 out:
284 	return NOTIFY_DONE;
285 }
286 
287 static struct notifier_block lockd_inetaddr_notifier = {
288 	.notifier_call = lockd_inetaddr_event,
289 };
290 
291 #if IS_ENABLED(CONFIG_IPV6)
lockd_inet6addr_event(struct notifier_block * this,unsigned long event,void * ptr)292 static int lockd_inet6addr_event(struct notifier_block *this,
293 	unsigned long event, void *ptr)
294 {
295 	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
296 	struct sockaddr_in6 sin6;
297 
298 	if (event != NETDEV_DOWN)
299 		goto out;
300 
301 	if (nlmsvc_serv) {
302 		dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
303 		sin6.sin6_family = AF_INET6;
304 		sin6.sin6_addr = ifa->addr;
305 		if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
306 			sin6.sin6_scope_id = ifa->idev->dev->ifindex;
307 		svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6);
308 	}
309 
310 out:
311 	return NOTIFY_DONE;
312 }
313 
314 static struct notifier_block lockd_inet6addr_notifier = {
315 	.notifier_call = lockd_inet6addr_event,
316 };
317 #endif
318 
lockd_get(void)319 static int lockd_get(void)
320 {
321 	struct svc_serv *serv;
322 	int error;
323 
324 	if (nlmsvc_serv) {
325 		nlmsvc_users++;
326 		return 0;
327 	}
328 
329 	/*
330 	 * Sanity check: if there's no pid,
331 	 * we should be the first user ...
332 	 */
333 	if (nlmsvc_users)
334 		printk(KERN_WARNING
335 			"lockd_up: no pid, %d users??\n", nlmsvc_users);
336 
337 	if (!nlm_timeout)
338 		nlm_timeout = LOCKD_DFLT_TIMEO;
339 	nlmsvc_timeout = nlm_timeout * HZ;
340 
341 	serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd);
342 	if (!serv) {
343 		printk(KERN_WARNING "lockd_up: create service failed\n");
344 		return -ENOMEM;
345 	}
346 
347 	serv->sv_maxconn = nlm_max_connections;
348 	error = svc_set_num_threads(serv, NULL, 1);
349 	/* The thread now holds the only reference */
350 	svc_put(serv);
351 	if (error < 0)
352 		return error;
353 
354 	nlmsvc_serv = serv;
355 	register_inetaddr_notifier(&lockd_inetaddr_notifier);
356 #if IS_ENABLED(CONFIG_IPV6)
357 	register_inet6addr_notifier(&lockd_inet6addr_notifier);
358 #endif
359 	dprintk("lockd_up: service created\n");
360 	nlmsvc_users++;
361 	return 0;
362 }
363 
lockd_put(void)364 static void lockd_put(void)
365 {
366 	if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n"))
367 		return;
368 	if (--nlmsvc_users)
369 		return;
370 
371 	unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
372 #if IS_ENABLED(CONFIG_IPV6)
373 	unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
374 #endif
375 
376 	svc_set_num_threads(nlmsvc_serv, NULL, 0);
377 	timer_delete_sync(&nlmsvc_retry);
378 	nlmsvc_serv = NULL;
379 	dprintk("lockd_down: service destroyed\n");
380 }
381 
382 /*
383  * Bring up the lockd process if it's not already up.
384  */
lockd_up(struct net * net,const struct cred * cred)385 int lockd_up(struct net *net, const struct cred *cred)
386 {
387 	int error;
388 
389 	mutex_lock(&nlmsvc_mutex);
390 
391 	error = lockd_get();
392 	if (error)
393 		goto err;
394 
395 	error = lockd_up_net(nlmsvc_serv, net, cred);
396 	if (error < 0) {
397 		lockd_put();
398 		goto err;
399 	}
400 
401 err:
402 	mutex_unlock(&nlmsvc_mutex);
403 	return error;
404 }
405 EXPORT_SYMBOL_GPL(lockd_up);
406 
407 /*
408  * Decrement the user count and bring down lockd if we're the last.
409  */
410 void
lockd_down(struct net * net)411 lockd_down(struct net *net)
412 {
413 	mutex_lock(&nlmsvc_mutex);
414 	lockd_down_net(nlmsvc_serv, net);
415 	lockd_put();
416 	mutex_unlock(&nlmsvc_mutex);
417 }
418 EXPORT_SYMBOL_GPL(lockd_down);
419 
420 #ifdef CONFIG_SYSCTL
421 
422 /*
423  * Sysctl parameters (same as module parameters, different interface).
424  */
425 
426 static struct ctl_table nlm_sysctls[] = {
427 	{
428 		.procname	= "nlm_grace_period",
429 		.data		= &nlm_grace_period,
430 		.maxlen		= sizeof(unsigned long),
431 		.mode		= 0644,
432 		.proc_handler	= proc_doulongvec_minmax,
433 		.extra1		= (unsigned long *) &nlm_grace_period_min,
434 		.extra2		= (unsigned long *) &nlm_grace_period_max,
435 	},
436 	{
437 		.procname	= "nlm_timeout",
438 		.data		= &nlm_timeout,
439 		.maxlen		= sizeof(unsigned long),
440 		.mode		= 0644,
441 		.proc_handler	= proc_doulongvec_minmax,
442 		.extra1		= (unsigned long *) &nlm_timeout_min,
443 		.extra2		= (unsigned long *) &nlm_timeout_max,
444 	},
445 	{
446 		.procname	= "nlm_udpport",
447 		.data		= &nlm_udpport,
448 		.maxlen		= sizeof(int),
449 		.mode		= 0644,
450 		.proc_handler	= proc_dointvec_minmax,
451 		.extra1		= (int *) &nlm_port_min,
452 		.extra2		= (int *) &nlm_port_max,
453 	},
454 	{
455 		.procname	= "nlm_tcpport",
456 		.data		= &nlm_tcpport,
457 		.maxlen		= sizeof(int),
458 		.mode		= 0644,
459 		.proc_handler	= proc_dointvec_minmax,
460 		.extra1		= (int *) &nlm_port_min,
461 		.extra2		= (int *) &nlm_port_max,
462 	},
463 	{
464 		.procname	= "nsm_use_hostnames",
465 		.data		= &nsm_use_hostnames,
466 		.maxlen		= sizeof(bool),
467 		.mode		= 0644,
468 		.proc_handler	= proc_dobool,
469 	},
470 	{
471 		.procname	= "nsm_local_state",
472 		.data		= &nsm_local_state,
473 		.maxlen		= sizeof(int),
474 		.mode		= 0644,
475 		.proc_handler	= proc_dointvec,
476 	},
477 	{ }
478 };
479 
480 #endif	/* CONFIG_SYSCTL */
481 
482 /*
483  * Module (and sysfs) parameters.
484  */
485 
486 #define param_set_min_max(name, type, which_strtol, min, max)		\
487 static int param_set_##name(const char *val, const struct kernel_param *kp) \
488 {									\
489 	char *endp;							\
490 	__typeof__(type) num = which_strtol(val, &endp, 0);		\
491 	if (endp == val || *endp || num < (min) || num > (max))		\
492 		return -EINVAL;						\
493 	*((type *) kp->arg) = num;					\
494 	return 0;							\
495 }
496 
is_callback(u32 proc)497 static inline int is_callback(u32 proc)
498 {
499 	return proc == NLMPROC_GRANTED
500 		|| proc == NLMPROC_GRANTED_MSG
501 		|| proc == NLMPROC_TEST_RES
502 		|| proc == NLMPROC_LOCK_RES
503 		|| proc == NLMPROC_CANCEL_RES
504 		|| proc == NLMPROC_UNLOCK_RES
505 		|| proc == NLMPROC_NSM_NOTIFY;
506 }
507 
508 
lockd_authenticate(struct svc_rqst * rqstp)509 static enum svc_auth_status lockd_authenticate(struct svc_rqst *rqstp)
510 {
511 	rqstp->rq_client = NULL;
512 	switch (rqstp->rq_authop->flavour) {
513 		case RPC_AUTH_NULL:
514 		case RPC_AUTH_UNIX:
515 			rqstp->rq_auth_stat = rpc_auth_ok;
516 			if (rqstp->rq_proc == 0)
517 				return SVC_OK;
518 			if (is_callback(rqstp->rq_proc)) {
519 				/* Leave it to individual procedures to
520 				 * call nlmsvc_lookup_host(rqstp)
521 				 */
522 				return SVC_OK;
523 			}
524 			return svc_set_client(rqstp);
525 	}
526 	rqstp->rq_auth_stat = rpc_autherr_badcred;
527 	return SVC_DENIED;
528 }
529 
530 
531 param_set_min_max(port, int, simple_strtol, 0, 65535)
532 param_set_min_max(grace_period, unsigned long, simple_strtoul,
533 		  nlm_grace_period_min, nlm_grace_period_max)
534 param_set_min_max(timeout, unsigned long, simple_strtoul,
535 		  nlm_timeout_min, nlm_timeout_max)
536 
537 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
538 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
539 MODULE_LICENSE("GPL");
540 
541 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
542 		  &nlm_grace_period, 0644);
543 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
544 		  &nlm_timeout, 0644);
545 module_param_call(nlm_udpport, param_set_port, param_get_int,
546 		  &nlm_udpport, 0644);
547 module_param_call(nlm_tcpport, param_set_port, param_get_int,
548 		  &nlm_tcpport, 0644);
549 module_param(nsm_use_hostnames, bool, 0644);
550 module_param(nlm_max_connections, uint, 0644);
551 
lockd_init_net(struct net * net)552 static int lockd_init_net(struct net *net)
553 {
554 	struct lockd_net *ln = net_generic(net, lockd_net_id);
555 
556 	INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
557 	INIT_LIST_HEAD(&ln->lockd_manager.list);
558 	ln->lockd_manager.block_opens = false;
559 	INIT_LIST_HEAD(&ln->nsm_handles);
560 	return 0;
561 }
562 
lockd_exit_net(struct net * net)563 static void lockd_exit_net(struct net *net)
564 {
565 	struct lockd_net *ln = net_generic(net, lockd_net_id);
566 
567 	WARN_ONCE(!list_empty(&ln->lockd_manager.list),
568 		  "net %x %s: lockd_manager.list is not empty\n",
569 		  net->ns.inum, __func__);
570 	WARN_ONCE(!list_empty(&ln->nsm_handles),
571 		  "net %x %s: nsm_handles list is not empty\n",
572 		  net->ns.inum, __func__);
573 	WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
574 		  "net %x %s: grace_period_end was not cancelled\n",
575 		  net->ns.inum, __func__);
576 }
577 
578 static struct pernet_operations lockd_net_ops = {
579 	.init = lockd_init_net,
580 	.exit = lockd_exit_net,
581 	.id = &lockd_net_id,
582 	.size = sizeof(struct lockd_net),
583 };
584 
585 
586 /*
587  * Initialising and terminating the module.
588  */
589 
init_nlm(void)590 static int __init init_nlm(void)
591 {
592 	int err;
593 
594 #ifdef CONFIG_SYSCTL
595 	err = -ENOMEM;
596 	nlm_sysctl_table = register_sysctl("fs/nfs", nlm_sysctls);
597 	if (nlm_sysctl_table == NULL)
598 		goto err_sysctl;
599 #endif
600 	err = register_pernet_subsys(&lockd_net_ops);
601 	if (err)
602 		goto err_pernet;
603 
604 	err = lockd_create_procfs();
605 	if (err)
606 		goto err_procfs;
607 
608 	return 0;
609 
610 err_procfs:
611 	unregister_pernet_subsys(&lockd_net_ops);
612 err_pernet:
613 #ifdef CONFIG_SYSCTL
614 	unregister_sysctl_table(nlm_sysctl_table);
615 err_sysctl:
616 #endif
617 	return err;
618 }
619 
exit_nlm(void)620 static void __exit exit_nlm(void)
621 {
622 	/* FIXME: delete all NLM clients */
623 	nlm_shutdown_hosts();
624 	lockd_remove_procfs();
625 	unregister_pernet_subsys(&lockd_net_ops);
626 #ifdef CONFIG_SYSCTL
627 	unregister_sysctl_table(nlm_sysctl_table);
628 #endif
629 }
630 
631 module_init(init_nlm);
632 module_exit(exit_nlm);
633 
634 /**
635  * nlmsvc_dispatch - Process an NLM Request
636  * @rqstp: incoming request
637  *
638  * Return values:
639  *  %0: Processing complete; do not send a Reply
640  *  %1: Processing complete; send Reply in rqstp->rq_res
641  */
nlmsvc_dispatch(struct svc_rqst * rqstp)642 static int nlmsvc_dispatch(struct svc_rqst *rqstp)
643 {
644 	const struct svc_procedure *procp = rqstp->rq_procinfo;
645 	__be32 *statp = rqstp->rq_accept_statp;
646 
647 	if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream))
648 		goto out_decode_err;
649 
650 	*statp = procp->pc_func(rqstp);
651 	if (*statp == rpc_drop_reply)
652 		return 0;
653 	if (*statp != rpc_success)
654 		return 1;
655 
656 	if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream))
657 		goto out_encode_err;
658 
659 	return 1;
660 
661 out_decode_err:
662 	*statp = rpc_garbage_args;
663 	return 1;
664 
665 out_encode_err:
666 	*statp = rpc_system_err;
667 	return 1;
668 }
669 
670 /*
671  * Define NLM program and procedures
672  */
673 static DEFINE_PER_CPU_ALIGNED(unsigned long, nlmsvc_version1_count[17]);
674 static const struct svc_version	nlmsvc_version1 = {
675 	.vs_vers	= 1,
676 	.vs_nproc	= 17,
677 	.vs_proc	= nlmsvc_procedures,
678 	.vs_count	= nlmsvc_version1_count,
679 	.vs_dispatch	= nlmsvc_dispatch,
680 	.vs_xdrsize	= NLMSVC_XDRSIZE,
681 };
682 
683 static DEFINE_PER_CPU_ALIGNED(unsigned long,
684 			      nlmsvc_version3_count[ARRAY_SIZE(nlmsvc_procedures)]);
685 static const struct svc_version	nlmsvc_version3 = {
686 	.vs_vers	= 3,
687 	.vs_nproc	= ARRAY_SIZE(nlmsvc_procedures),
688 	.vs_proc	= nlmsvc_procedures,
689 	.vs_count	= nlmsvc_version3_count,
690 	.vs_dispatch	= nlmsvc_dispatch,
691 	.vs_xdrsize	= NLMSVC_XDRSIZE,
692 };
693 
694 #ifdef CONFIG_LOCKD_V4
695 static DEFINE_PER_CPU_ALIGNED(unsigned long,
696 			      nlmsvc_version4_count[ARRAY_SIZE(nlmsvc_procedures4)]);
697 static const struct svc_version	nlmsvc_version4 = {
698 	.vs_vers	= 4,
699 	.vs_nproc	= ARRAY_SIZE(nlmsvc_procedures4),
700 	.vs_proc	= nlmsvc_procedures4,
701 	.vs_count	= nlmsvc_version4_count,
702 	.vs_dispatch	= nlmsvc_dispatch,
703 	.vs_xdrsize	= NLMSVC_XDRSIZE,
704 };
705 #endif
706 
707 static const struct svc_version *nlmsvc_version[] = {
708 	[1] = &nlmsvc_version1,
709 	[3] = &nlmsvc_version3,
710 #ifdef CONFIG_LOCKD_V4
711 	[4] = &nlmsvc_version4,
712 #endif
713 };
714 
715 #define NLM_NRVERS	ARRAY_SIZE(nlmsvc_version)
716 static struct svc_program	nlmsvc_program = {
717 	.pg_prog		= NLM_PROGRAM,		/* program number */
718 	.pg_nvers		= NLM_NRVERS,		/* number of entries in nlmsvc_version */
719 	.pg_vers		= nlmsvc_version,	/* version table */
720 	.pg_name		= "lockd",		/* service name */
721 	.pg_class		= "nfsd",		/* share authentication with nfsd */
722 	.pg_authenticate	= &lockd_authenticate,	/* export authentication */
723 	.pg_init_request	= svc_generic_init_request,
724 	.pg_rpcbind_set		= svc_generic_rpcbind_set,
725 };
726