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 * If the kernel has IPv6 support available, always listen for
57 * both AF_INET and AF_INET6 requests.
59 #if (defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)) && \
60 defined(CONFIG_SUNRPC_REGISTER_V4)
61 static const sa_family_t nlmsvc_family = AF_INET6;
62 #else /* (CONFIG_IPV6 || CONFIG_IPV6_MODULE) && CONFIG_SUNRPC_REGISTER_V4 */
63 static const sa_family_t nlmsvc_family = AF_INET;
64 #endif /* (CONFIG_IPV6 || CONFIG_IPV6_MODULE) && CONFIG_SUNRPC_REGISTER_V4 */
67 * These can be set at insmod time (useful for NFS as root filesystem),
68 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
70 static unsigned long nlm_grace_period;
71 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
72 static int nlm_udpport, nlm_tcpport;
74 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
75 static unsigned int nlm_max_connections = 1024;
78 * Constants needed for the sysctl interface.
80 static const unsigned long nlm_grace_period_min = 0;
81 static const unsigned long nlm_grace_period_max = 240;
82 static const unsigned long nlm_timeout_min = 3;
83 static const unsigned long nlm_timeout_max = 20;
84 static const int nlm_port_min = 0, nlm_port_max = 65535;
87 static struct ctl_table_header * nlm_sysctl_table;
90 static unsigned long get_lockd_grace_period(void)
92 /* Note: nlm_timeout should always be nonzero */
94 return roundup(nlm_grace_period, nlm_timeout) * HZ;
96 return nlm_timeout * 5 * HZ;
99 static struct lock_manager lockd_manager = {
102 static void grace_ender(struct work_struct *not_used)
104 locks_end_grace(&lockd_manager);
107 static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
109 static void set_grace_period(void)
111 unsigned long grace_period = get_lockd_grace_period();
113 locks_start_grace(&lockd_manager);
114 cancel_delayed_work_sync(&grace_period_end);
115 schedule_delayed_work(&grace_period_end, grace_period);
119 * This is the lockd kernel thread
124 int err = 0, preverr = 0;
125 struct svc_rqst *rqstp = vrqstp;
127 /* try_to_freeze() is called from svc_recv() */
130 /* Allow SIGKILL to tell lockd to drop all of its locks */
131 allow_signal(SIGKILL);
133 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
136 * FIXME: it would be nice if lockd didn't spend its entire life
137 * running under the BKL. At the very least, it would be good to
138 * have someone clarify what it's intended to protect here. I've
139 * seen some handwavy posts about posix locking needing to be
140 * done under the BKL, but it's far from clear.
145 nlm_timeout = LOCKD_DFLT_TIMEO;
146 nlmsvc_timeout = nlm_timeout * HZ;
151 * The main request loop. We don't terminate until the last
152 * NFS mount or NFS daemon has gone away.
154 while (!kthread_should_stop()) {
155 long timeout = MAX_SCHEDULE_TIMEOUT;
156 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
158 /* update sv_maxconn if it has changed */
159 rqstp->rq_server->sv_maxconn = nlm_max_connections;
162 flush_signals(current);
164 nlmsvc_invalidate_all();
170 timeout = nlmsvc_retry_blocked();
173 * Find a socket with data available and call its
176 err = svc_recv(rqstp, timeout);
177 if (err == -EAGAIN || err == -EINTR) {
182 if (err != preverr) {
183 printk(KERN_WARNING "%s: unexpected error "
184 "from svc_recv (%d)\n", __func__, err);
187 schedule_timeout_interruptible(HZ);
192 dprintk("lockd: request from %s\n",
193 svc_print_addr(rqstp, buf, sizeof(buf)));
197 flush_signals(current);
198 cancel_delayed_work_sync(&grace_period_end);
199 locks_end_grace(&lockd_manager);
201 nlmsvc_invalidate_all();
202 nlm_shutdown_hosts();
208 * Ensure there are active UDP and TCP listeners for lockd.
210 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
211 * local services (such as rpc.statd) still require UDP, and
212 * some NFS servers do not yet support NLM over TCP.
214 * Returns zero if all listeners are available; otherwise a
215 * negative errno value is returned.
217 static int make_socks(struct svc_serv *serv)
220 struct svc_xprt *xprt;
223 xprt = svc_find_xprt(serv, "udp", 0, 0);
225 err = svc_create_xprt(serv, "udp", nlm_udpport,
230 xprt = svc_find_xprt(serv, "tcp", 0, 0);
232 err = svc_create_xprt(serv, "tcp", nlm_tcpport,
240 } else if (warned++ == 0)
242 "lockd_up: makesock failed, error=%d\n", err);
247 * Bring up the lockd process if it's not already up.
251 struct svc_serv *serv;
254 mutex_lock(&nlmsvc_mutex);
256 * Check whether we're already up and running.
262 * Sanity check: if there's no pid,
263 * we should be the first user ...
267 "lockd_up: no pid, %d users??\n", nlmsvc_users);
270 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, nlmsvc_family, NULL);
272 printk(KERN_WARNING "lockd_up: create service failed\n");
276 error = make_socks(serv);
278 goto destroy_and_out;
281 * Create the kernel thread and wait for it to start.
283 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
284 if (IS_ERR(nlmsvc_rqst)) {
285 error = PTR_ERR(nlmsvc_rqst);
288 "lockd_up: svc_rqst allocation failed, error=%d\n",
290 goto destroy_and_out;
293 svc_sock_update_bufs(serv);
294 serv->sv_maxconn = nlm_max_connections;
296 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
297 if (IS_ERR(nlmsvc_task)) {
298 error = PTR_ERR(nlmsvc_task);
299 svc_exit_thread(nlmsvc_rqst);
303 "lockd_up: kthread_run failed, error=%d\n", error);
304 goto destroy_and_out;
308 * Note: svc_serv structures have an initial use count of 1,
309 * so we exit through here on both success and failure.
316 mutex_unlock(&nlmsvc_mutex);
319 EXPORT_SYMBOL_GPL(lockd_up);
322 * Decrement the user count and bring down lockd if we're the last.
327 mutex_lock(&nlmsvc_mutex);
332 printk(KERN_ERR "lockd_down: no users! task=%p\n",
338 printk(KERN_ERR "lockd_down: no lockd running.\n");
341 kthread_stop(nlmsvc_task);
342 svc_exit_thread(nlmsvc_rqst);
346 mutex_unlock(&nlmsvc_mutex);
348 EXPORT_SYMBOL_GPL(lockd_down);
353 * Sysctl parameters (same as module parameters, different interface).
356 static ctl_table nlm_sysctls[] = {
358 .ctl_name = CTL_UNNUMBERED,
359 .procname = "nlm_grace_period",
360 .data = &nlm_grace_period,
361 .maxlen = sizeof(unsigned long),
363 .proc_handler = &proc_doulongvec_minmax,
364 .extra1 = (unsigned long *) &nlm_grace_period_min,
365 .extra2 = (unsigned long *) &nlm_grace_period_max,
368 .ctl_name = CTL_UNNUMBERED,
369 .procname = "nlm_timeout",
370 .data = &nlm_timeout,
371 .maxlen = sizeof(unsigned long),
373 .proc_handler = &proc_doulongvec_minmax,
374 .extra1 = (unsigned long *) &nlm_timeout_min,
375 .extra2 = (unsigned long *) &nlm_timeout_max,
378 .ctl_name = CTL_UNNUMBERED,
379 .procname = "nlm_udpport",
380 .data = &nlm_udpport,
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 = "nlm_tcpport",
390 .data = &nlm_tcpport,
391 .maxlen = sizeof(int),
393 .proc_handler = &proc_dointvec_minmax,
394 .extra1 = (int *) &nlm_port_min,
395 .extra2 = (int *) &nlm_port_max,
398 .ctl_name = CTL_UNNUMBERED,
399 .procname = "nsm_use_hostnames",
400 .data = &nsm_use_hostnames,
401 .maxlen = sizeof(int),
403 .proc_handler = &proc_dointvec,
406 .ctl_name = CTL_UNNUMBERED,
407 .procname = "nsm_local_state",
408 .data = &nsm_local_state,
409 .maxlen = sizeof(int),
411 .proc_handler = &proc_dointvec,
416 static ctl_table nlm_sysctl_dir[] = {
418 .ctl_name = CTL_UNNUMBERED,
421 .child = nlm_sysctls,
426 static ctl_table nlm_sysctl_root[] = {
431 .child = nlm_sysctl_dir,
436 #endif /* CONFIG_SYSCTL */
439 * Module (and sysfs) parameters.
442 #define param_set_min_max(name, type, which_strtol, min, max) \
443 static int param_set_##name(const char *val, struct kernel_param *kp) \
446 __typeof__(type) num = which_strtol(val, &endp, 0); \
447 if (endp == val || *endp || num < (min) || num > (max)) \
449 *((int *) kp->arg) = num; \
453 static inline int is_callback(u32 proc)
455 return proc == NLMPROC_GRANTED
456 || proc == NLMPROC_GRANTED_MSG
457 || proc == NLMPROC_TEST_RES
458 || proc == NLMPROC_LOCK_RES
459 || proc == NLMPROC_CANCEL_RES
460 || proc == NLMPROC_UNLOCK_RES
461 || proc == NLMPROC_NSM_NOTIFY;
465 static int lockd_authenticate(struct svc_rqst *rqstp)
467 rqstp->rq_client = NULL;
468 switch (rqstp->rq_authop->flavour) {
471 if (rqstp->rq_proc == 0)
473 if (is_callback(rqstp->rq_proc)) {
474 /* Leave it to individual procedures to
475 * call nlmsvc_lookup_host(rqstp)
479 return svc_set_client(rqstp);
485 param_set_min_max(port, int, simple_strtol, 0, 65535)
486 param_set_min_max(grace_period, unsigned long, simple_strtoul,
487 nlm_grace_period_min, nlm_grace_period_max)
488 param_set_min_max(timeout, unsigned long, simple_strtoul,
489 nlm_timeout_min, nlm_timeout_max)
491 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
492 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
493 MODULE_LICENSE("GPL");
495 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
496 &nlm_grace_period, 0644);
497 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
499 module_param_call(nlm_udpport, param_set_port, param_get_int,
501 module_param_call(nlm_tcpport, param_set_port, param_get_int,
503 module_param(nsm_use_hostnames, bool, 0644);
504 module_param(nlm_max_connections, uint, 0644);
507 * Initialising and terminating the module.
510 static int __init init_nlm(void)
513 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
514 return nlm_sysctl_table ? 0 : -ENOMEM;
520 static void __exit exit_nlm(void)
522 /* FIXME: delete all NLM clients */
523 nlm_shutdown_hosts();
525 unregister_sysctl_table(nlm_sysctl_table);
529 module_init(init_nlm);
530 module_exit(exit_nlm);
533 * Define NLM program and procedures
535 static struct svc_version nlmsvc_version1 = {
538 .vs_proc = nlmsvc_procedures,
539 .vs_xdrsize = NLMSVC_XDRSIZE,
541 static struct svc_version nlmsvc_version3 = {
544 .vs_proc = nlmsvc_procedures,
545 .vs_xdrsize = NLMSVC_XDRSIZE,
547 #ifdef CONFIG_LOCKD_V4
548 static struct svc_version nlmsvc_version4 = {
551 .vs_proc = nlmsvc_procedures4,
552 .vs_xdrsize = NLMSVC_XDRSIZE,
555 static struct svc_version * nlmsvc_version[] = {
556 [1] = &nlmsvc_version1,
557 [3] = &nlmsvc_version3,
558 #ifdef CONFIG_LOCKD_V4
559 [4] = &nlmsvc_version4,
563 static struct svc_stat nlmsvc_stats;
565 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
566 static struct svc_program nlmsvc_program = {
567 .pg_prog = NLM_PROGRAM, /* program number */
568 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
569 .pg_vers = nlmsvc_version, /* version table */
570 .pg_name = "lockd", /* service name */
571 .pg_class = "nfsd", /* share authentication with nfsd */
572 .pg_stats = &nlmsvc_stats, /* stats table */
573 .pg_authenticate = &lockd_authenticate /* export authentication */