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>
29 #include <linux/sunrpc/types.h>
30 #include <linux/sunrpc/stats.h>
31 #include <linux/sunrpc/clnt.h>
32 #include <linux/sunrpc/svc.h>
33 #include <linux/sunrpc/svcsock.h>
35 #include <linux/lockd/lockd.h>
36 #include <linux/nfs.h>
38 #define NLMDBG_FACILITY NLMDBG_SVC
39 #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
40 #define ALLOWED_SIGS (sigmask(SIGKILL))
42 static struct svc_program nlmsvc_program;
44 struct nlmsvc_binding * nlmsvc_ops;
45 EXPORT_SYMBOL(nlmsvc_ops);
47 static DEFINE_MUTEX(nlmsvc_mutex);
48 static unsigned int nlmsvc_users;
49 static pid_t nlmsvc_pid;
50 static struct svc_serv *nlmsvc_serv;
51 int nlmsvc_grace_period;
52 unsigned long nlmsvc_timeout;
54 static DECLARE_COMPLETION(lockd_start_done);
55 static DECLARE_WAIT_QUEUE_HEAD(lockd_exit);
58 * These can be set at insmod time (useful for NFS as root filesystem),
59 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
61 static unsigned long nlm_grace_period;
62 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
63 static int nlm_udpport, nlm_tcpport;
64 int nsm_use_hostnames = 0;
67 * Constants needed for the sysctl interface.
69 static const unsigned long nlm_grace_period_min = 0;
70 static const unsigned long nlm_grace_period_max = 240;
71 static const unsigned long nlm_timeout_min = 3;
72 static const unsigned long nlm_timeout_max = 20;
73 static const int nlm_port_min = 0, nlm_port_max = 65535;
75 static struct ctl_table_header * nlm_sysctl_table;
77 static unsigned long set_grace_period(void)
79 unsigned long grace_period;
81 /* Note: nlm_timeout should always be nonzero */
83 grace_period = ((nlm_grace_period + nlm_timeout - 1)
84 / nlm_timeout) * nlm_timeout * HZ;
86 grace_period = nlm_timeout * 5 * HZ;
87 nlmsvc_grace_period = 1;
88 return grace_period + jiffies;
91 static inline void clear_grace_period(void)
93 nlmsvc_grace_period = 0;
97 * This is the lockd kernel thread
100 lockd(struct svc_rqst *rqstp)
103 unsigned long grace_period_expire;
105 /* Lock module and set up kernel thread */
106 /* lockd_up is waiting for us to startup, so will
107 * be holding a reference to this module, so it
108 * is safe to just claim another reference
110 __module_get(THIS_MODULE);
114 * Let our maker know we're running.
116 nlmsvc_pid = current->pid;
117 nlmsvc_serv = rqstp->rq_server;
118 complete(&lockd_start_done);
122 /* Process request with signals blocked, but allow SIGKILL. */
123 allow_signal(SIGKILL);
128 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
131 nlm_timeout = LOCKD_DFLT_TIMEO;
132 nlmsvc_timeout = nlm_timeout * HZ;
134 grace_period_expire = set_grace_period();
137 * The main request loop. We don't terminate until the last
138 * NFS mount or NFS daemon has gone away, and we've been sent a
139 * signal, or else another process has taken over our job.
141 while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) {
142 long timeout = MAX_SCHEDULE_TIMEOUT;
145 flush_signals(current);
147 nlmsvc_invalidate_all();
148 grace_period_expire = set_grace_period();
153 * Retry any blocked locks that have been notified by
154 * the VFS. Don't do this during grace period.
155 * (Theoretically, there shouldn't even be blocked locks
156 * during grace period).
158 if (!nlmsvc_grace_period) {
159 timeout = nlmsvc_retry_blocked();
160 } else if (time_before(grace_period_expire, jiffies))
161 clear_grace_period();
164 * Find a socket with data available and call its
167 err = svc_recv(rqstp, timeout);
168 if (err == -EAGAIN || err == -EINTR)
172 "lockd: terminating on error %d\n",
177 dprintk("lockd: request from %08x\n",
178 (unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr));
184 flush_signals(current);
187 * Check whether there's a new lockd process before
188 * shutting down the hosts and clearing the slot.
190 if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
192 nlmsvc_invalidate_all();
193 nlm_shutdown_hosts();
198 "lockd: new process, skipping host shutdown\n");
199 wake_up(&lockd_exit);
201 /* Exit the RPC thread */
202 svc_exit_thread(rqstp);
209 module_put_and_exit(0);
213 static int find_socket(struct svc_serv *serv, int proto)
215 struct svc_sock *svsk;
217 list_for_each_entry(svsk, &serv->sv_permsocks, sk_list)
218 if (svsk->sk_sk->sk_protocol == proto) {
225 static int make_socks(struct svc_serv *serv, int proto)
227 /* Make any sockets that are needed but not present.
228 * If nlm_udpport or nlm_tcpport were set as module
229 * options, make those sockets unconditionally
233 if (proto == IPPROTO_UDP || nlm_udpport)
234 if (!find_socket(serv, IPPROTO_UDP))
235 err = svc_makesock(serv, IPPROTO_UDP, nlm_udpport);
236 if (err == 0 && (proto == IPPROTO_TCP || nlm_tcpport))
237 if (!find_socket(serv, IPPROTO_TCP))
238 err= svc_makesock(serv, IPPROTO_TCP, nlm_tcpport);
241 else if (warned++ == 0)
243 "lockd_up: makesock failed, error=%d\n", err);
248 * Bring up the lockd process if it's not already up.
251 lockd_up(int proto) /* Maybe add a 'family' option when IPv6 is supported ?? */
253 struct svc_serv * serv;
256 mutex_lock(&nlmsvc_mutex);
258 * Check whether we're already up and running.
262 error = make_socks(nlmsvc_serv, proto);
267 * Sanity check: if there's no pid,
268 * we should be the first user ...
272 "lockd_up: no pid, %d users??\n", nlmsvc_users);
275 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
277 printk(KERN_WARNING "lockd_up: create service failed\n");
281 if ((error = make_socks(serv, proto)) < 0)
282 goto destroy_and_out;
285 * Create the kernel thread and wait for it to start.
287 error = svc_create_thread(lockd, serv);
290 "lockd_up: create thread failed, error=%d\n", error);
291 goto destroy_and_out;
293 wait_for_completion(&lockd_start_done);
296 * Note: svc_serv structures have an initial use count of 1,
297 * so we exit through here on both success and failure.
304 mutex_unlock(&nlmsvc_mutex);
307 EXPORT_SYMBOL(lockd_up);
310 * Decrement the user count and bring down lockd if we're the last.
317 mutex_lock(&nlmsvc_mutex);
322 printk(KERN_WARNING "lockd_down: no users! pid=%d\n", nlmsvc_pid);
326 printk(KERN_WARNING "lockd_down: no lockd running.\n");
331 kill_proc(nlmsvc_pid, SIGKILL, 1);
333 * Wait for the lockd process to exit, but since we're holding
334 * the lockd semaphore, we can't wait around forever ...
336 clear_thread_flag(TIF_SIGPENDING);
337 interruptible_sleep_on_timeout(&lockd_exit, HZ);
340 "lockd_down: lockd failed to exit, clearing pid\n");
343 spin_lock_irq(¤t->sighand->siglock);
345 spin_unlock_irq(¤t->sighand->siglock);
347 mutex_unlock(&nlmsvc_mutex);
349 EXPORT_SYMBOL(lockd_down);
352 * Sysctl parameters (same as module parameters, different interface).
355 /* Something that isn't CTL_ANY, CTL_NONE or a value that may clash. */
356 #define CTL_UNNUMBERED -2
358 static ctl_table nlm_sysctls[] = {
360 .ctl_name = CTL_UNNUMBERED,
361 .procname = "nlm_grace_period",
362 .data = &nlm_grace_period,
363 .maxlen = sizeof(unsigned long),
365 .proc_handler = &proc_doulongvec_minmax,
366 .extra1 = (unsigned long *) &nlm_grace_period_min,
367 .extra2 = (unsigned long *) &nlm_grace_period_max,
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "nlm_timeout",
372 .data = &nlm_timeout,
373 .maxlen = sizeof(unsigned long),
375 .proc_handler = &proc_doulongvec_minmax,
376 .extra1 = (unsigned long *) &nlm_timeout_min,
377 .extra2 = (unsigned long *) &nlm_timeout_max,
380 .ctl_name = CTL_UNNUMBERED,
381 .procname = "nlm_udpport",
382 .data = &nlm_udpport,
383 .maxlen = sizeof(int),
385 .proc_handler = &proc_dointvec_minmax,
386 .extra1 = (int *) &nlm_port_min,
387 .extra2 = (int *) &nlm_port_max,
390 .ctl_name = CTL_UNNUMBERED,
391 .procname = "nlm_tcpport",
392 .data = &nlm_tcpport,
393 .maxlen = sizeof(int),
395 .proc_handler = &proc_dointvec_minmax,
396 .extra1 = (int *) &nlm_port_min,
397 .extra2 = (int *) &nlm_port_max,
400 .ctl_name = CTL_UNNUMBERED,
401 .procname = "nsm_use_hostnames",
402 .data = &nsm_use_hostnames,
403 .maxlen = sizeof(int),
405 .proc_handler = &proc_dointvec,
410 static ctl_table nlm_sysctl_dir[] = {
412 .ctl_name = CTL_UNNUMBERED,
415 .child = nlm_sysctls,
420 static ctl_table nlm_sysctl_root[] = {
425 .child = nlm_sysctl_dir,
431 * Module (and driverfs) parameters.
434 #define param_set_min_max(name, type, which_strtol, min, max) \
435 static int param_set_##name(const char *val, struct kernel_param *kp) \
438 __typeof__(type) num = which_strtol(val, &endp, 0); \
439 if (endp == val || *endp || num < (min) || num > (max)) \
441 *((int *) kp->arg) = num; \
445 static inline int is_callback(u32 proc)
447 return proc == NLMPROC_GRANTED
448 || proc == NLMPROC_GRANTED_MSG
449 || proc == NLMPROC_TEST_RES
450 || proc == NLMPROC_LOCK_RES
451 || proc == NLMPROC_CANCEL_RES
452 || proc == NLMPROC_UNLOCK_RES
453 || proc == NLMPROC_NSM_NOTIFY;
457 static int lockd_authenticate(struct svc_rqst *rqstp)
459 rqstp->rq_client = NULL;
460 switch (rqstp->rq_authop->flavour) {
463 if (rqstp->rq_proc == 0)
465 if (is_callback(rqstp->rq_proc)) {
466 /* Leave it to individual procedures to
467 * call nlmsvc_lookup_host(rqstp)
471 return svc_set_client(rqstp);
477 param_set_min_max(port, int, simple_strtol, 0, 65535)
478 param_set_min_max(grace_period, unsigned long, simple_strtoul,
479 nlm_grace_period_min, nlm_grace_period_max)
480 param_set_min_max(timeout, unsigned long, simple_strtoul,
481 nlm_timeout_min, nlm_timeout_max)
483 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
484 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
485 MODULE_LICENSE("GPL");
487 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
488 &nlm_grace_period, 0644);
489 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
491 module_param_call(nlm_udpport, param_set_port, param_get_int,
493 module_param_call(nlm_tcpport, param_set_port, param_get_int,
495 module_param(nsm_use_hostnames, bool, 0644);
498 * Initialising and terminating the module.
501 static int __init init_nlm(void)
503 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root, 0);
504 return nlm_sysctl_table ? 0 : -ENOMEM;
507 static void __exit exit_nlm(void)
509 /* FIXME: delete all NLM clients */
510 nlm_shutdown_hosts();
511 unregister_sysctl_table(nlm_sysctl_table);
514 module_init(init_nlm);
515 module_exit(exit_nlm);
518 * Define NLM program and procedures
520 static struct svc_version nlmsvc_version1 = {
523 .vs_proc = nlmsvc_procedures,
524 .vs_xdrsize = NLMSVC_XDRSIZE,
526 static struct svc_version nlmsvc_version3 = {
529 .vs_proc = nlmsvc_procedures,
530 .vs_xdrsize = NLMSVC_XDRSIZE,
532 #ifdef CONFIG_LOCKD_V4
533 static struct svc_version nlmsvc_version4 = {
536 .vs_proc = nlmsvc_procedures4,
537 .vs_xdrsize = NLMSVC_XDRSIZE,
540 static struct svc_version * nlmsvc_version[] = {
541 [1] = &nlmsvc_version1,
542 [3] = &nlmsvc_version3,
543 #ifdef CONFIG_LOCKD_V4
544 [4] = &nlmsvc_version4,
548 static struct svc_stat nlmsvc_stats;
550 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
551 static struct svc_program nlmsvc_program = {
552 .pg_prog = NLM_PROGRAM, /* program number */
553 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
554 .pg_vers = nlmsvc_version, /* version table */
555 .pg_name = "lockd", /* service name */
556 .pg_class = "nfsd", /* share authentication with nfsd */
557 .pg_stats = &nlmsvc_stats, /* stats table */
558 .pg_authenticate = &lockd_authenticate /* export authentication */