blob: 2444780f5cfa061eaea1c1930646bd6d7ff04ee1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/lockd/svc.c
3 *
4 * This is the central lockd service.
5 *
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?
9 *
10 * Authors: Olaf Kirch (okir@monad.swb.de)
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
13 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/sysctl.h>
18#include <linux/moduleparam.h>
19
20#include <linux/sched.h>
21#include <linux/errno.h>
22#include <linux/in.h>
23#include <linux/uio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/smp.h>
Ingo Molnar353ab6e2006-03-26 01:37:12 -080025#include <linux/mutex.h>
Jeff Laytond751a7c2008-02-07 16:34:55 -050026#include <linux/kthread.h>
Rafael J. Wysocki83144182007-07-17 04:03:35 -070027#include <linux/freezer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
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>
NeilBrown24e36662006-10-02 02:17:45 -070034#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/lockd/lockd.h>
36#include <linux/nfs.h>
37
38#define NLMDBG_FACILITY NLMDBG_SVC
39#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
40#define ALLOWED_SIGS (sigmask(SIGKILL))
41
42static struct svc_program nlmsvc_program;
43
44struct nlmsvc_binding * nlmsvc_ops;
Trond Myklebust2de59872008-12-23 15:21:33 -050045EXPORT_SYMBOL_GPL(nlmsvc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Ingo Molnar353ab6e2006-03-26 01:37:12 -080047static DEFINE_MUTEX(nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static unsigned int nlmsvc_users;
Jeff Laytond751a7c2008-02-07 16:34:55 -050049static struct task_struct *nlmsvc_task;
Jeff Laytonabd1ec42008-06-11 10:03:12 -040050static struct svc_rqst *nlmsvc_rqst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051unsigned long nlmsvc_timeout;
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/*
54 * These can be set at insmod time (useful for NFS as root filesystem),
55 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003
56 */
57static unsigned long nlm_grace_period;
58static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
59static int nlm_udpport, nlm_tcpport;
60
Jeff Laytonc72a4762008-10-20 11:51:58 -040061/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
62static unsigned int nlm_max_connections = 1024;
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064/*
65 * Constants needed for the sysctl interface.
66 */
67static const unsigned long nlm_grace_period_min = 0;
68static const unsigned long nlm_grace_period_max = 240;
69static const unsigned long nlm_timeout_min = 3;
70static const unsigned long nlm_timeout_max = 20;
71static const int nlm_port_min = 0, nlm_port_max = 65535;
72
Chuck Lever90d5b182008-03-14 14:18:30 -040073#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static struct ctl_table_header * nlm_sysctl_table;
Chuck Lever90d5b182008-03-14 14:18:30 -040075#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Marc Eshel9a8db972007-07-17 04:04:35 -070077static unsigned long get_lockd_grace_period(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 /* Note: nlm_timeout should always be nonzero */
80 if (nlm_grace_period)
Marc Eshel9a8db972007-07-17 04:04:35 -070081 return roundup(nlm_grace_period, nlm_timeout) * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 else
Marc Eshel9a8db972007-07-17 04:04:35 -070083 return nlm_timeout * 5 * HZ;
84}
85
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040086static struct lock_manager lockd_manager = {
87};
Marc Eshel9a8db972007-07-17 04:04:35 -070088
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040089static void grace_ender(struct work_struct *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040091 locks_end_grace(&lockd_manager);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040094static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
95
96static void set_grace_period(void)
97{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040098 unsigned long grace_period = get_lockd_grace_period();
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040099
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400100 locks_start_grace(&lockd_manager);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400101 cancel_delayed_work_sync(&grace_period_end);
102 schedule_delayed_work(&grace_period_end, grace_period);
103}
104
J. Bruce Fields89996df2009-05-06 16:32:54 -0400105static void restart_grace(void)
106{
107 if (nlmsvc_ops) {
108 cancel_delayed_work_sync(&grace_period_end);
109 locks_end_grace(&lockd_manager);
110 nlmsvc_invalidate_all();
111 set_grace_period();
112 }
113}
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/*
116 * This is the lockd kernel thread
117 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500118static int
119lockd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120{
Jeff Laytonf97c6502008-04-08 15:40:08 -0400121 int err = 0, preverr = 0;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500122 struct svc_rqst *rqstp = vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Jeff Laytond751a7c2008-02-07 16:34:55 -0500124 /* try_to_freeze() is called from svc_recv() */
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700125 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Jeff Laytond751a7c2008-02-07 16:34:55 -0500127 /* Allow SIGKILL to tell lockd to drop all of its locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 allow_signal(SIGKILL);
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
131
132 if (!nlm_timeout)
133 nlm_timeout = LOCKD_DFLT_TIMEO;
134 nlmsvc_timeout = nlm_timeout * HZ;
135
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400136 set_grace_period();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 /*
139 * The main request loop. We don't terminate until the last
Jeff Laytond751a7c2008-02-07 16:34:55 -0500140 * NFS mount or NFS daemon has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500142 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 long timeout = MAX_SCHEDULE_TIMEOUT;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300144 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Jeff Laytonc72a4762008-10-20 11:51:58 -0400146 /* update sv_maxconn if it has changed */
147 rqstp->rq_server->sv_maxconn = nlm_max_connections;
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (signalled()) {
150 flush_signals(current);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400151 restart_grace();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500152 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
154
J. Bruce Fields8fafa902008-01-24 11:11:34 -0500155 timeout = nlmsvc_retry_blocked();
156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 /*
158 * Find a socket with data available and call its
159 * recvfrom routine.
160 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700161 err = svc_recv(rqstp, timeout);
Jeff Laytonf97c6502008-04-08 15:40:08 -0400162 if (err == -EAGAIN || err == -EINTR) {
163 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
Jeff Laytonf97c6502008-04-08 15:40:08 -0400166 if (err < 0) {
167 if (err != preverr) {
168 printk(KERN_WARNING "%s: unexpected error "
169 "from svc_recv (%d)\n", __func__, err);
170 preverr = err;
171 }
172 schedule_timeout_interruptible(HZ);
173 continue;
174 }
175 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Chuck Leverad06e4b2007-02-12 00:53:32 -0800177 dprintk("lockd: request from %s\n",
178 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
NeilBrown6fb2b472006-10-02 02:17:50 -0700180 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
Trond Myklebust2bd61572006-01-03 09:55:19 +0100182 flush_signals(current);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400183 cancel_delayed_work_sync(&grace_period_end);
J. Bruce Fields2c5e7612008-11-20 14:36:17 -0600184 locks_end_grace(&lockd_manager);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500185 if (nlmsvc_ops)
186 nlmsvc_invalidate_all();
187 nlm_shutdown_hosts();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500188 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
190
Chuck Levereb16e902009-03-18 20:47:59 -0400191static int create_lockd_listener(struct svc_serv *serv, const char *name,
192 const int family, const unsigned short port)
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500193{
194 struct svc_xprt *xprt;
195
Chuck Levereb16e902009-03-18 20:47:59 -0400196 xprt = svc_find_xprt(serv, name, family, 0);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500197 if (xprt == NULL)
Pavel Emelyanovfc5d00b2010-09-29 16:03:50 +0400198 return svc_create_xprt(serv, name, &init_net, family, port,
Chuck Levereb16e902009-03-18 20:47:59 -0400199 SVC_SOCK_DEFAULTS);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500200 svc_xprt_put(xprt);
201 return 0;
202}
203
Chuck Levereb16e902009-03-18 20:47:59 -0400204static int create_lockd_family(struct svc_serv *serv, const int family)
205{
206 int err;
207
208 err = create_lockd_listener(serv, "udp", family, nlm_udpport);
209 if (err < 0)
210 return err;
211
212 return create_lockd_listener(serv, "tcp", family, nlm_tcpport);
213}
214
Chuck Lever482fb942007-02-12 00:53:29 -0800215/*
Chuck Lever8c3916f2008-10-03 17:15:23 -0400216 * Ensure there are active UDP and TCP listeners for lockd.
217 *
218 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
219 * local services (such as rpc.statd) still require UDP, and
220 * some NFS servers do not yet support NLM over TCP.
221 *
222 * Returns zero if all listeners are available; otherwise a
223 * negative errno value is returned.
Chuck Lever482fb942007-02-12 00:53:29 -0800224 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400225static int make_socks(struct svc_serv *serv)
NeilBrown24e36662006-10-02 02:17:45 -0700226{
Chuck Lever482fb942007-02-12 00:53:29 -0800227 static int warned;
Chuck Lever0dba7c22008-12-31 16:06:11 -0500228 int err;
Chuck Lever482fb942007-02-12 00:53:29 -0800229
Chuck Levereb16e902009-03-18 20:47:59 -0400230 err = create_lockd_family(serv, PF_INET);
Chuck Lever0dba7c22008-12-31 16:06:11 -0500231 if (err < 0)
232 goto out_err;
233
Chuck Levereb16e902009-03-18 20:47:59 -0400234 err = create_lockd_family(serv, PF_INET6);
235 if (err < 0 && err != -EAFNOSUPPORT)
Chuck Lever0dba7c22008-12-31 16:06:11 -0500236 goto out_err;
237
238 warned = 0;
239 return 0;
240
241out_err:
242 if (warned++ == 0)
NeilBrown7dcf91e2006-10-02 02:17:52 -0700243 printk(KERN_WARNING
Chuck Lever0dba7c22008-12-31 16:06:11 -0500244 "lockd_up: makesock failed, error=%d\n", err);
NeilBrown24e36662006-10-02 02:17:45 -0700245 return err;
246}
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248/*
249 * Bring up the lockd process if it's not already up.
250 */
Chuck Lever26a41402008-10-03 17:15:30 -0400251int lockd_up(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Jeff Laytond751a7c2008-02-07 16:34:55 -0500253 struct svc_serv *serv;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500254 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800256 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 * Check whether we're already up and running.
259 */
Chuck Lever8c3916f2008-10-03 17:15:23 -0400260 if (nlmsvc_rqst)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 goto out;
262
263 /*
264 * Sanity check: if there's no pid,
265 * we should be the first user ...
266 */
NeilBrown4a3ae422006-10-02 02:17:53 -0700267 if (nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 printk(KERN_WARNING
269 "lockd_up: no pid, %d users??\n", nlmsvc_users);
270
271 error = -ENOMEM;
Chuck Lever49a90722009-03-18 20:46:29 -0400272 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 if (!serv) {
274 printk(KERN_WARNING "lockd_up: create service failed\n");
275 goto out;
276 }
277
Chuck Lever8c3916f2008-10-03 17:15:23 -0400278 error = make_socks(serv);
279 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 goto destroy_and_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 /*
283 * Create the kernel thread and wait for it to start.
284 */
Eric Dumazet11fd1652011-07-28 20:04:09 +0200285 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400286 if (IS_ERR(nlmsvc_rqst)) {
287 error = PTR_ERR(nlmsvc_rqst);
288 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 printk(KERN_WARNING
Jeff Laytond751a7c2008-02-07 16:34:55 -0500290 "lockd_up: svc_rqst allocation failed, error=%d\n",
291 error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 goto destroy_and_out;
293 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500294
295 svc_sock_update_bufs(serv);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400296 serv->sv_maxconn = nlm_max_connections;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500297
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400298 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500299 if (IS_ERR(nlmsvc_task)) {
300 error = PTR_ERR(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400301 svc_exit_thread(nlmsvc_rqst);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500302 nlmsvc_task = NULL;
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400303 nlmsvc_rqst = NULL;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500304 printk(KERN_WARNING
305 "lockd_up: kthread_run failed, error=%d\n", error);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500306 goto destroy_and_out;
307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 /*
310 * Note: svc_serv structures have an initial use count of 1,
311 * so we exit through here on both success and failure.
312 */
313destroy_and_out:
314 svc_destroy(serv);
315out:
NeilBrown4a3ae422006-10-02 02:17:53 -0700316 if (!error)
317 nlmsvc_users++;
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800318 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return error;
320}
Trond Myklebust2de59872008-12-23 15:21:33 -0500321EXPORT_SYMBOL_GPL(lockd_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323/*
324 * Decrement the user count and bring down lockd if we're the last.
325 */
326void
327lockd_down(void)
328{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800329 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (nlmsvc_users) {
331 if (--nlmsvc_users)
332 goto out;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500333 } else {
334 printk(KERN_ERR "lockd_down: no users! task=%p\n",
335 nlmsvc_task);
336 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Jeff Laytond751a7c2008-02-07 16:34:55 -0500339 if (!nlmsvc_task) {
340 printk(KERN_ERR "lockd_down: no lockd running.\n");
341 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500343 kthread_stop(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400344 svc_exit_thread(nlmsvc_rqst);
345 nlmsvc_task = NULL;
346 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800348 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
Trond Myklebust2de59872008-12-23 15:21:33 -0500350EXPORT_SYMBOL_GPL(lockd_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Chuck Lever90d5b182008-03-14 14:18:30 -0400352#ifdef CONFIG_SYSCTL
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354/*
355 * Sysctl parameters (same as module parameters, different interface).
356 */
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358static ctl_table nlm_sysctls[] = {
359 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 .procname = "nlm_grace_period",
361 .data = &nlm_grace_period,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700362 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800364 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 .extra1 = (unsigned long *) &nlm_grace_period_min,
366 .extra2 = (unsigned long *) &nlm_grace_period_max,
367 },
368 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 .procname = "nlm_timeout",
370 .data = &nlm_timeout,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700371 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800373 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 .extra1 = (unsigned long *) &nlm_timeout_min,
375 .extra2 = (unsigned long *) &nlm_timeout_max,
376 },
377 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 .procname = "nlm_udpport",
379 .data = &nlm_udpport,
380 .maxlen = sizeof(int),
381 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800382 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 .extra1 = (int *) &nlm_port_min,
384 .extra2 = (int *) &nlm_port_max,
385 },
386 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 .procname = "nlm_tcpport",
388 .data = &nlm_tcpport,
389 .maxlen = sizeof(int),
390 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800391 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 .extra1 = (int *) &nlm_port_min,
393 .extra2 = (int *) &nlm_port_max,
394 },
Olaf Kirchabd1f502006-10-04 02:16:01 -0700395 {
Olaf Kirchabd1f502006-10-04 02:16:01 -0700396 .procname = "nsm_use_hostnames",
397 .data = &nsm_use_hostnames,
398 .maxlen = sizeof(int),
399 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800400 .proc_handler = proc_dointvec,
Olaf Kirchabd1f502006-10-04 02:16:01 -0700401 },
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700402 {
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700403 .procname = "nsm_local_state",
404 .data = &nsm_local_state,
405 .maxlen = sizeof(int),
406 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800407 .proc_handler = proc_dointvec,
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700408 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800409 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410};
411
412static ctl_table nlm_sysctl_dir[] = {
413 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 .procname = "nfs",
415 .mode = 0555,
416 .child = nlm_sysctls,
417 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800418 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419};
420
421static ctl_table nlm_sysctl_root[] = {
422 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 .procname = "fs",
424 .mode = 0555,
425 .child = nlm_sysctl_dir,
426 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800427 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428};
429
Chuck Lever90d5b182008-03-14 14:18:30 -0400430#endif /* CONFIG_SYSCTL */
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100433 * Module (and sysfs) parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 */
435
436#define param_set_min_max(name, type, which_strtol, min, max) \
437static int param_set_##name(const char *val, struct kernel_param *kp) \
438{ \
439 char *endp; \
440 __typeof__(type) num = which_strtol(val, &endp, 0); \
441 if (endp == val || *endp || num < (min) || num > (max)) \
442 return -EINVAL; \
NeilBrownde5b8e82012-02-07 15:35:42 +1100443 *((type *) kp->arg) = num; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return 0; \
445}
446
447static inline int is_callback(u32 proc)
448{
449 return proc == NLMPROC_GRANTED
450 || proc == NLMPROC_GRANTED_MSG
451 || proc == NLMPROC_TEST_RES
452 || proc == NLMPROC_LOCK_RES
453 || proc == NLMPROC_CANCEL_RES
454 || proc == NLMPROC_UNLOCK_RES
455 || proc == NLMPROC_NSM_NOTIFY;
456}
457
458
459static int lockd_authenticate(struct svc_rqst *rqstp)
460{
461 rqstp->rq_client = NULL;
462 switch (rqstp->rq_authop->flavour) {
463 case RPC_AUTH_NULL:
464 case RPC_AUTH_UNIX:
465 if (rqstp->rq_proc == 0)
466 return SVC_OK;
467 if (is_callback(rqstp->rq_proc)) {
468 /* Leave it to individual procedures to
469 * call nlmsvc_lookup_host(rqstp)
470 */
471 return SVC_OK;
472 }
473 return svc_set_client(rqstp);
474 }
475 return SVC_DENIED;
476}
477
478
479param_set_min_max(port, int, simple_strtol, 0, 65535)
480param_set_min_max(grace_period, unsigned long, simple_strtoul,
481 nlm_grace_period_min, nlm_grace_period_max)
482param_set_min_max(timeout, unsigned long, simple_strtoul,
483 nlm_timeout_min, nlm_timeout_max)
484
485MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
486MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
487MODULE_LICENSE("GPL");
488
489module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
490 &nlm_grace_period, 0644);
491module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
492 &nlm_timeout, 0644);
493module_param_call(nlm_udpport, param_set_port, param_get_int,
494 &nlm_udpport, 0644);
495module_param_call(nlm_tcpport, param_set_port, param_get_int,
496 &nlm_tcpport, 0644);
Olaf Kirchabd1f502006-10-04 02:16:01 -0700497module_param(nsm_use_hostnames, bool, 0644);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400498module_param(nlm_max_connections, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500/*
501 * Initialising and terminating the module.
502 */
503
504static int __init init_nlm(void)
505{
Chuck Lever90d5b182008-03-14 14:18:30 -0400506#ifdef CONFIG_SYSCTL
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800507 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 return nlm_sysctl_table ? 0 : -ENOMEM;
Chuck Lever90d5b182008-03-14 14:18:30 -0400509#else
510 return 0;
511#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512}
513
514static void __exit exit_nlm(void)
515{
516 /* FIXME: delete all NLM clients */
517 nlm_shutdown_hosts();
Chuck Lever90d5b182008-03-14 14:18:30 -0400518#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 unregister_sysctl_table(nlm_sysctl_table);
Chuck Lever90d5b182008-03-14 14:18:30 -0400520#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521}
522
523module_init(init_nlm);
524module_exit(exit_nlm);
525
526/*
527 * Define NLM program and procedures
528 */
529static struct svc_version nlmsvc_version1 = {
530 .vs_vers = 1,
531 .vs_nproc = 17,
532 .vs_proc = nlmsvc_procedures,
533 .vs_xdrsize = NLMSVC_XDRSIZE,
534};
535static struct svc_version nlmsvc_version3 = {
536 .vs_vers = 3,
537 .vs_nproc = 24,
538 .vs_proc = nlmsvc_procedures,
539 .vs_xdrsize = NLMSVC_XDRSIZE,
540};
541#ifdef CONFIG_LOCKD_V4
542static struct svc_version nlmsvc_version4 = {
543 .vs_vers = 4,
544 .vs_nproc = 24,
545 .vs_proc = nlmsvc_procedures4,
546 .vs_xdrsize = NLMSVC_XDRSIZE,
547};
548#endif
549static struct svc_version * nlmsvc_version[] = {
550 [1] = &nlmsvc_version1,
551 [3] = &nlmsvc_version3,
552#ifdef CONFIG_LOCKD_V4
553 [4] = &nlmsvc_version4,
554#endif
555};
556
557static struct svc_stat nlmsvc_stats;
558
Tobias Klausere8c96f82006-03-24 03:15:34 -0800559#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560static struct svc_program nlmsvc_program = {
561 .pg_prog = NLM_PROGRAM, /* program number */
562 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
563 .pg_vers = nlmsvc_version, /* version table */
564 .pg_name = "lockd", /* service name */
565 .pg_class = "nfsd", /* share authentication with nfsd */
566 .pg_stats = &nlmsvc_stats, /* stats table */
567 .pg_authenticate = &lockd_authenticate /* export authentication */
568};