4 * This is the central lockd service.
6 * FIXME: Separate the lockd NFS server functionality from the lockd NFS
7 * client functionality. Oh why didn't Sun create two separate
8 * services in the first place?
10 * Authors: Olaf Kirch (okir@monad.swb.de)
12 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/sysctl.h>
18 #include <linux/moduleparam.h>
20 #include <linux/sched.h>
21 #include <linux/errno.h>
23 #include <linux/uio.h>
24 #include <linux/slab.h>
25 #include <linux/smp.h>
26 #include <linux/smp_lock.h>
27 #include <linux/mutex.h>
28 #include <linux/kthread.h>
29 #include <linux/freezer.h>
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>
37 #include <linux/lockd/lockd.h>
38 #include <linux/nfs.h>
40 #define NLMDBG_FACILITY NLMDBG_SVC
41 #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
42 #define ALLOWED_SIGS (sigmask(SIGKILL))
44 static struct svc_program nlmsvc_program;
46 struct nlmsvc_binding * nlmsvc_ops;
47 EXPORT_SYMBOL_GPL(nlmsvc_ops);
49 static DEFINE_MUTEX(nlmsvc_mutex);
50 static unsigned int nlmsvc_users;
51 static struct task_struct *nlmsvc_task;
52 static struct svc_rqst *nlmsvc_rqst;
53 unsigned long nlmsvc_timeout;
56 * These can be set at insmod time (useful for NFS as root filesystem),
57 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
59 static unsigned long nlm_grace_period;
60 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
61 static int nlm_udpport, nlm_tcpport;
62 int nsm_use_hostnames = 0;
64 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
65 static unsigned int nlm_max_connections = 1024;
68 * Constants needed for the sysctl interface.
70 static const unsigned long nlm_grace_period_min = 0;
71 static const unsigned long nlm_grace_period_max = 240;
72 static const unsigned long nlm_timeout_min = 3;
73 static const unsigned long nlm_timeout_max = 20;
74 static const int nlm_port_min = 0, nlm_port_max = 65535;
77 static struct ctl_table_header * nlm_sysctl_table;
80 static unsigned long get_lockd_grace_period(void)
82 /* Note: nlm_timeout should always be nonzero */
84 return roundup(nlm_grace_period, nlm_timeout) * HZ;
86 return nlm_timeout * 5 * HZ;
89 static struct lock_manager lockd_manager = {
92 static void grace_ender(struct work_struct *not_used)
94 locks_end_grace(&lockd_manager);
97 static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
99 static void set_grace_period(void)
101 unsigned long grace_period = get_lockd_grace_period();
103 locks_start_grace(&lockd_manager);
104 cancel_delayed_work_sync(&grace_period_end);
105 schedule_delayed_work(&grace_period_end, grace_period);
109 * This is the lockd kernel thread
114 int err = 0, preverr = 0;
115 struct svc_rqst *rqstp = vrqstp;
117 /* try_to_freeze() is called from svc_recv() */
120 /* Allow SIGKILL to tell lockd to drop all of its locks */
121 allow_signal(SIGKILL);
123 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
126 * FIXME: it would be nice if lockd didn't spend its entire life
127 * running under the BKL. At the very least, it would be good to
128 * have someone clarify what it's intended to protect here. I've
129 * seen some handwavy posts about posix locking needing to be
130 * done under the BKL, but it's far from clear.
135 nlm_timeout = LOCKD_DFLT_TIMEO;
136 nlmsvc_timeout = nlm_timeout * HZ;
141 * The main request loop. We don't terminate until the last
142 * NFS mount or NFS daemon has gone away.
144 while (!kthread_should_stop()) {
145 long timeout = MAX_SCHEDULE_TIMEOUT;
146 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
148 /* update sv_maxconn if it has changed */
149 rqstp->rq_server->sv_maxconn = nlm_max_connections;
152 flush_signals(current);
154 nlmsvc_invalidate_all();
160 timeout = nlmsvc_retry_blocked();
163 * Find a socket with data available and call its
166 err = svc_recv(rqstp, timeout);
167 if (err == -EAGAIN || err == -EINTR) {
172 if (err != preverr) {
173 printk(KERN_WARNING "%s: unexpected error "
174 "from svc_recv (%d)\n", __func__, err);
177 schedule_timeout_interruptible(HZ);
182 dprintk("lockd: request from %s\n",
183 svc_print_addr(rqstp, buf, sizeof(buf)));
187 flush_signals(current);
188 cancel_delayed_work_sync(&grace_period_end);
189 locks_end_grace(&lockd_manager);
191 nlmsvc_invalidate_all();
192 nlm_shutdown_hosts();
198 * Ensure there are active UDP and TCP listeners for lockd.
200 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
201 * local services (such as rpc.statd) still require UDP, and
202 * some NFS servers do not yet support NLM over TCP.
204 * Returns zero if all listeners are available; otherwise a
205 * negative errno value is returned.
207 static int make_socks(struct svc_serv *serv)
210 struct svc_xprt *xprt;
213 xprt = svc_find_xprt(serv, "udp", 0, 0);
215 err = svc_create_xprt(serv, "udp", nlm_udpport,
220 xprt = svc_find_xprt(serv, "tcp", 0, 0);
222 err = svc_create_xprt(serv, "tcp", nlm_tcpport,
230 } else if (warned++ == 0)
232 "lockd_up: makesock failed, error=%d\n", err);
237 * Bring up the lockd process if it's not already up.
241 struct svc_serv *serv;
244 mutex_lock(&nlmsvc_mutex);
246 * Check whether we're already up and running.
252 * Sanity check: if there's no pid,
253 * we should be the first user ...
257 "lockd_up: no pid, %d users??\n", nlmsvc_users);
260 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, AF_INET, NULL);
262 printk(KERN_WARNING "lockd_up: create service failed\n");
266 error = make_socks(serv);
268 goto destroy_and_out;
271 * Create the kernel thread and wait for it to start.
273 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
274 if (IS_ERR(nlmsvc_rqst)) {
275 error = PTR_ERR(nlmsvc_rqst);
278 "lockd_up: svc_rqst allocation failed, error=%d\n",
280 goto destroy_and_out;
283 svc_sock_update_bufs(serv);
284 serv->sv_maxconn = nlm_max_connections;
286 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
287 if (IS_ERR(nlmsvc_task)) {
288 error = PTR_ERR(nlmsvc_task);
289 svc_exit_thread(nlmsvc_rqst);
293 "lockd_up: kthread_run failed, error=%d\n", error);
294 goto destroy_and_out;
298 * Note: svc_serv structures have an initial use count of 1,
299 * so we exit through here on both success and failure.
306 mutex_unlock(&nlmsvc_mutex);
309 EXPORT_SYMBOL_GPL(lockd_up);
312 * Decrement the user count and bring down lockd if we're the last.
317 mutex_lock(&nlmsvc_mutex);
322 printk(KERN_ERR "lockd_down: no users! task=%p\n",
328 printk(KERN_ERR "lockd_down: no lockd running.\n");
331 kthread_stop(nlmsvc_task);
332 svc_exit_thread(nlmsvc_rqst);
336 mutex_unlock(&nlmsvc_mutex);
338 EXPORT_SYMBOL_GPL(lockd_down);
343 * Sysctl parameters (same as module parameters, different interface).
346 static ctl_table nlm_sysctls[] = {
348 .ctl_name = CTL_UNNUMBERED,
349 .procname = "nlm_grace_period",
350 .data = &nlm_grace_period,
351 .maxlen = sizeof(unsigned long),
353 .proc_handler = &proc_doulongvec_minmax,
354 .extra1 = (unsigned long *) &nlm_grace_period_min,
355 .extra2 = (unsigned long *) &nlm_grace_period_max,
358 .ctl_name = CTL_UNNUMBERED,
359 .procname = "nlm_timeout",
360 .data = &nlm_timeout,
361 .maxlen = sizeof(unsigned long),
363 .proc_handler = &proc_doulongvec_minmax,
364 .extra1 = (unsigned long *) &nlm_timeout_min,
365 .extra2 = (unsigned long *) &nlm_timeout_max,
368 .ctl_name = CTL_UNNUMBERED,
369 .procname = "nlm_udpport",
370 .data = &nlm_udpport,
371 .maxlen = sizeof(int),
373 .proc_handler = &proc_dointvec_minmax,
374 .extra1 = (int *) &nlm_port_min,
375 .extra2 = (int *) &nlm_port_max,
378 .ctl_name = CTL_UNNUMBERED,
379 .procname = "nlm_tcpport",
380 .data = &nlm_tcpport,
381 .maxlen = sizeof(int),
383 .proc_handler = &proc_dointvec_minmax,
384 .extra1 = (int *) &nlm_port_min,
385 .extra2 = (int *) &nlm_port_max,
388 .ctl_name = CTL_UNNUMBERED,
389 .procname = "nsm_use_hostnames",
390 .data = &nsm_use_hostnames,
391 .maxlen = sizeof(int),
393 .proc_handler = &proc_dointvec,
396 .ctl_name = CTL_UNNUMBERED,
397 .procname = "nsm_local_state",
398 .data = &nsm_local_state,
399 .maxlen = sizeof(int),
401 .proc_handler = &proc_dointvec,
406 static ctl_table nlm_sysctl_dir[] = {
408 .ctl_name = CTL_UNNUMBERED,
411 .child = nlm_sysctls,
416 static ctl_table nlm_sysctl_root[] = {
421 .child = nlm_sysctl_dir,
426 #endif /* CONFIG_SYSCTL */
429 * Module (and sysfs) parameters.
432 #define param_set_min_max(name, type, which_strtol, min, max) \
433 static int param_set_##name(const char *val, struct kernel_param *kp) \
436 __typeof__(type) num = which_strtol(val, &endp, 0); \
437 if (endp == val || *endp || num < (min) || num > (max)) \
439 *((int *) kp->arg) = num; \
443 static inline int is_callback(u32 proc)
445 return proc == NLMPROC_GRANTED
446 || proc == NLMPROC_GRANTED_MSG
447 || proc == NLMPROC_TEST_RES
448 || proc == NLMPROC_LOCK_RES
449 || proc == NLMPROC_CANCEL_RES
450 || proc == NLMPROC_UNLOCK_RES
451 || proc == NLMPROC_NSM_NOTIFY;
455 static int lockd_authenticate(struct svc_rqst *rqstp)
457 rqstp->rq_client = NULL;
458 switch (rqstp->rq_authop->flavour) {
461 if (rqstp->rq_proc == 0)
463 if (is_callback(rqstp->rq_proc)) {
464 /* Leave it to individual procedures to
465 * call nlmsvc_lookup_host(rqstp)
469 return svc_set_client(rqstp);
475 param_set_min_max(port, int, simple_strtol, 0, 65535)
476 param_set_min_max(grace_period, unsigned long, simple_strtoul,
477 nlm_grace_period_min, nlm_grace_period_max)
478 param_set_min_max(timeout, unsigned long, simple_strtoul,
479 nlm_timeout_min, nlm_timeout_max)
481 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
482 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
483 MODULE_LICENSE("GPL");
485 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
486 &nlm_grace_period, 0644);
487 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
489 module_param_call(nlm_udpport, param_set_port, param_get_int,
491 module_param_call(nlm_tcpport, param_set_port, param_get_int,
493 module_param(nsm_use_hostnames, bool, 0644);
494 module_param(nlm_max_connections, uint, 0644);
497 * Initialising and terminating the module.
500 static int __init init_nlm(void)
503 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
504 return nlm_sysctl_table ? 0 : -ENOMEM;
510 static void __exit exit_nlm(void)
512 /* FIXME: delete all NLM clients */
513 nlm_shutdown_hosts();
515 unregister_sysctl_table(nlm_sysctl_table);
519 module_init(init_nlm);
520 module_exit(exit_nlm);
523 * Define NLM program and procedures
525 static struct svc_version nlmsvc_version1 = {
528 .vs_proc = nlmsvc_procedures,
529 .vs_xdrsize = NLMSVC_XDRSIZE,
531 static struct svc_version nlmsvc_version3 = {
534 .vs_proc = nlmsvc_procedures,
535 .vs_xdrsize = NLMSVC_XDRSIZE,
537 #ifdef CONFIG_LOCKD_V4
538 static struct svc_version nlmsvc_version4 = {
541 .vs_proc = nlmsvc_procedures4,
542 .vs_xdrsize = NLMSVC_XDRSIZE,
545 static struct svc_version * nlmsvc_version[] = {
546 [1] = &nlmsvc_version1,
547 [3] = &nlmsvc_version3,
548 #ifdef CONFIG_LOCKD_V4
549 [4] = &nlmsvc_version4,
553 static struct svc_stat nlmsvc_stats;
555 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
556 static struct svc_program nlmsvc_program = {
557 .pg_prog = NLM_PROGRAM, /* program number */
558 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
559 .pg_vers = nlmsvc_version, /* version table */
560 .pg_name = "lockd", /* service name */
561 .pg_class = "nfsd", /* share authentication with nfsd */
562 .pg_stats = &nlmsvc_stats, /* stats table */
563 .pg_authenticate = &lockd_authenticate /* export authentication */