blob: f49b9afc443690a2377db100ed7da33452ef98db [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
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +040038#include "netns.h"
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define NLMDBG_FACILITY NLMDBG_SVC
41#define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE)
42#define ALLOWED_SIGS (sigmask(SIGKILL))
43
44static struct svc_program nlmsvc_program;
45
46struct nlmsvc_binding * nlmsvc_ops;
Trond Myklebust2de59872008-12-23 15:21:33 -050047EXPORT_SYMBOL_GPL(nlmsvc_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Ingo Molnar353ab6e2006-03-26 01:37:12 -080049static DEFINE_MUTEX(nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static unsigned int nlmsvc_users;
Jeff Laytond751a7c2008-02-07 16:34:55 -050051static struct task_struct *nlmsvc_task;
Jeff Laytonabd1ec42008-06-11 10:03:12 -040052static struct svc_rqst *nlmsvc_rqst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053unsigned long nlmsvc_timeout;
54
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +040055int lockd_net_id;
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/*
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
60 */
61static unsigned long nlm_grace_period;
62static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO;
63static int nlm_udpport, nlm_tcpport;
64
Jeff Laytonc72a4762008-10-20 11:51:58 -040065/* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
66static unsigned int nlm_max_connections = 1024;
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/*
69 * Constants needed for the sysctl interface.
70 */
71static const unsigned long nlm_grace_period_min = 0;
72static const unsigned long nlm_grace_period_max = 240;
73static const unsigned long nlm_timeout_min = 3;
74static const unsigned long nlm_timeout_max = 20;
75static const int nlm_port_min = 0, nlm_port_max = 65535;
76
Chuck Lever90d5b182008-03-14 14:18:30 -040077#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static struct ctl_table_header * nlm_sysctl_table;
Chuck Lever90d5b182008-03-14 14:18:30 -040079#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Marc Eshel9a8db972007-07-17 04:04:35 -070081static unsigned long get_lockd_grace_period(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 /* Note: nlm_timeout should always be nonzero */
84 if (nlm_grace_period)
Marc Eshel9a8db972007-07-17 04:04:35 -070085 return roundup(nlm_grace_period, nlm_timeout) * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 else
Marc Eshel9a8db972007-07-17 04:04:35 -070087 return nlm_timeout * 5 * HZ;
88}
89
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040090static struct lock_manager lockd_manager = {
91};
Marc Eshel9a8db972007-07-17 04:04:35 -070092
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040093static void grace_ender(struct work_struct *not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -040095 locks_end_grace(&lockd_manager);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -040098static DECLARE_DELAYED_WORK(grace_period_end, grace_ender);
99
100static void set_grace_period(void)
101{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400102 unsigned long grace_period = get_lockd_grace_period();
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400103
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400104 locks_start_grace(&lockd_manager);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400105 cancel_delayed_work_sync(&grace_period_end);
106 schedule_delayed_work(&grace_period_end, grace_period);
107}
108
J. Bruce Fields89996df2009-05-06 16:32:54 -0400109static void restart_grace(void)
110{
111 if (nlmsvc_ops) {
112 cancel_delayed_work_sync(&grace_period_end);
113 locks_end_grace(&lockd_manager);
114 nlmsvc_invalidate_all();
115 set_grace_period();
116 }
117}
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/*
120 * This is the lockd kernel thread
121 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500122static int
123lockd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Jeff Laytonf97c6502008-04-08 15:40:08 -0400125 int err = 0, preverr = 0;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500126 struct svc_rqst *rqstp = vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Jeff Laytond751a7c2008-02-07 16:34:55 -0500128 /* try_to_freeze() is called from svc_recv() */
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700129 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Jeff Laytond751a7c2008-02-07 16:34:55 -0500131 /* Allow SIGKILL to tell lockd to drop all of its locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 allow_signal(SIGKILL);
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
135
136 if (!nlm_timeout)
137 nlm_timeout = LOCKD_DFLT_TIMEO;
138 nlmsvc_timeout = nlm_timeout * HZ;
139
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400140 set_grace_period();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 /*
143 * The main request loop. We don't terminate until the last
Jeff Laytond751a7c2008-02-07 16:34:55 -0500144 * NFS mount or NFS daemon has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500146 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 long timeout = MAX_SCHEDULE_TIMEOUT;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300148 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Jeff Laytonc72a4762008-10-20 11:51:58 -0400150 /* update sv_maxconn if it has changed */
151 rqstp->rq_server->sv_maxconn = nlm_max_connections;
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if (signalled()) {
154 flush_signals(current);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400155 restart_grace();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500156 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158
J. Bruce Fields8fafa902008-01-24 11:11:34 -0500159 timeout = nlmsvc_retry_blocked();
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 /*
162 * Find a socket with data available and call its
163 * recvfrom routine.
164 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700165 err = svc_recv(rqstp, timeout);
Jeff Laytonf97c6502008-04-08 15:40:08 -0400166 if (err == -EAGAIN || err == -EINTR) {
167 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
Jeff Laytonf97c6502008-04-08 15:40:08 -0400170 if (err < 0) {
171 if (err != preverr) {
172 printk(KERN_WARNING "%s: unexpected error "
173 "from svc_recv (%d)\n", __func__, err);
174 preverr = err;
175 }
176 schedule_timeout_interruptible(HZ);
177 continue;
178 }
179 preverr = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Chuck Leverad06e4b2007-02-12 00:53:32 -0800181 dprintk("lockd: request from %s\n",
182 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
NeilBrown6fb2b472006-10-02 02:17:50 -0700184 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
Trond Myklebust2bd61572006-01-03 09:55:19 +0100186 flush_signals(current);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400187 cancel_delayed_work_sync(&grace_period_end);
J. Bruce Fields2c5e7612008-11-20 14:36:17 -0600188 locks_end_grace(&lockd_manager);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500189 if (nlmsvc_ops)
190 nlmsvc_invalidate_all();
191 nlm_shutdown_hosts();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500192 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Chuck Levereb16e902009-03-18 20:47:59 -0400195static int create_lockd_listener(struct svc_serv *serv, const char *name,
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400196 struct net *net, const int family,
197 const unsigned short port)
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500198{
199 struct svc_xprt *xprt;
200
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400201 xprt = svc_find_xprt(serv, name, net, family, 0);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500202 if (xprt == NULL)
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400203 return svc_create_xprt(serv, name, net, family, port,
Chuck Levereb16e902009-03-18 20:47:59 -0400204 SVC_SOCK_DEFAULTS);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500205 svc_xprt_put(xprt);
206 return 0;
207}
208
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400209static int create_lockd_family(struct svc_serv *serv, struct net *net,
210 const int family)
Chuck Levereb16e902009-03-18 20:47:59 -0400211{
212 int err;
213
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400214 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
Chuck Levereb16e902009-03-18 20:47:59 -0400215 if (err < 0)
216 return err;
217
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400218 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
Chuck Levereb16e902009-03-18 20:47:59 -0400219}
220
Chuck Lever482fb942007-02-12 00:53:29 -0800221/*
Chuck Lever8c3916f2008-10-03 17:15:23 -0400222 * Ensure there are active UDP and TCP listeners for lockd.
223 *
224 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
225 * local services (such as rpc.statd) still require UDP, and
226 * some NFS servers do not yet support NLM over TCP.
227 *
228 * Returns zero if all listeners are available; otherwise a
229 * negative errno value is returned.
Chuck Lever482fb942007-02-12 00:53:29 -0800230 */
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400231static int make_socks(struct svc_serv *serv, struct net *net)
NeilBrown24e36662006-10-02 02:17:45 -0700232{
Chuck Lever482fb942007-02-12 00:53:29 -0800233 static int warned;
Chuck Lever0dba7c22008-12-31 16:06:11 -0500234 int err;
Chuck Lever482fb942007-02-12 00:53:29 -0800235
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400236 err = create_lockd_family(serv, net, PF_INET);
Chuck Lever0dba7c22008-12-31 16:06:11 -0500237 if (err < 0)
238 goto out_err;
239
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400240 err = create_lockd_family(serv, net, PF_INET6);
Chuck Levereb16e902009-03-18 20:47:59 -0400241 if (err < 0 && err != -EAFNOSUPPORT)
Chuck Lever0dba7c22008-12-31 16:06:11 -0500242 goto out_err;
243
244 warned = 0;
245 return 0;
246
247out_err:
248 if (warned++ == 0)
NeilBrown7dcf91e2006-10-02 02:17:52 -0700249 printk(KERN_WARNING
Chuck Lever0dba7c22008-12-31 16:06:11 -0500250 "lockd_up: makesock failed, error=%d\n", err);
NeilBrown24e36662006-10-02 02:17:45 -0700251 return err;
252}
253
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400254static int lockd_up_net(struct net *net)
255{
256 struct lockd_net *ln = net_generic(net, lockd_net_id);
257 struct svc_serv *serv = nlmsvc_rqst->rq_server;
258 int error;
259
260 if (ln->nlmsvc_users)
261 return 0;
262
263 error = svc_rpcb_setup(serv, net);
264 if (error)
265 goto err_rpcb;
266
267 error = make_socks(serv, net);
268 if (error < 0)
269 goto err_socks;
270 return 0;
271
272err_socks:
273 svc_rpcb_cleanup(serv, net);
274err_rpcb:
275 return error;
276}
277
278static void lockd_down_net(struct net *net)
279{
280 struct lockd_net *ln = net_generic(net, lockd_net_id);
281 struct svc_serv *serv = nlmsvc_rqst->rq_server;
282
283 if (ln->nlmsvc_users) {
Stanislav Kinsbursky3b647392012-01-31 15:08:29 +0400284 if (--ln->nlmsvc_users == 0) {
285 nlm_shutdown_hosts_net(net);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400286 svc_shutdown_net(serv, net);
Stanislav Kinsbursky3b647392012-01-31 15:08:29 +0400287 }
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400288 } else {
289 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
290 nlmsvc_task, net);
291 BUG();
292 }
293}
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295/*
296 * Bring up the lockd process if it's not already up.
297 */
Chuck Lever26a41402008-10-03 17:15:30 -0400298int lockd_up(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
Jeff Laytond751a7c2008-02-07 16:34:55 -0500300 struct svc_serv *serv;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500301 int error = 0;
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400302 struct net *net = current->nsproxy->net_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800304 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 * Check whether we're already up and running.
307 */
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400308 if (nlmsvc_rqst) {
309 error = lockd_up_net(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 goto out;
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313 /*
314 * Sanity check: if there's no pid,
315 * we should be the first user ...
316 */
NeilBrown4a3ae422006-10-02 02:17:53 -0700317 if (nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 printk(KERN_WARNING
319 "lockd_up: no pid, %d users??\n", nlmsvc_users);
320
321 error = -ENOMEM;
Chuck Lever49a90722009-03-18 20:46:29 -0400322 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 if (!serv) {
324 printk(KERN_WARNING "lockd_up: create service failed\n");
325 goto out;
326 }
327
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400328 error = make_socks(serv, net);
Chuck Lever8c3916f2008-10-03 17:15:23 -0400329 if (error < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 goto destroy_and_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 /*
333 * Create the kernel thread and wait for it to start.
334 */
Eric Dumazet11fd1652011-07-28 20:04:09 +0200335 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400336 if (IS_ERR(nlmsvc_rqst)) {
337 error = PTR_ERR(nlmsvc_rqst);
338 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 printk(KERN_WARNING
Jeff Laytond751a7c2008-02-07 16:34:55 -0500340 "lockd_up: svc_rqst allocation failed, error=%d\n",
341 error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 goto destroy_and_out;
343 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500344
345 svc_sock_update_bufs(serv);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400346 serv->sv_maxconn = nlm_max_connections;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500347
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400348 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500349 if (IS_ERR(nlmsvc_task)) {
350 error = PTR_ERR(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400351 svc_exit_thread(nlmsvc_rqst);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500352 nlmsvc_task = NULL;
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400353 nlmsvc_rqst = NULL;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500354 printk(KERN_WARNING
355 "lockd_up: kthread_run failed, error=%d\n", error);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500356 goto destroy_and_out;
357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 /*
360 * Note: svc_serv structures have an initial use count of 1,
361 * so we exit through here on both success and failure.
362 */
363destroy_and_out:
364 svc_destroy(serv);
365out:
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400366 if (!error) {
367 struct lockd_net *ln = net_generic(net, lockd_net_id);
368
369 ln->nlmsvc_users++;
NeilBrown4a3ae422006-10-02 02:17:53 -0700370 nlmsvc_users++;
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400371 }
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800372 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return error;
374}
Trond Myklebust2de59872008-12-23 15:21:33 -0500375EXPORT_SYMBOL_GPL(lockd_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377/*
378 * Decrement the user count and bring down lockd if we're the last.
379 */
380void
381lockd_down(void)
382{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800383 mutex_lock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (nlmsvc_users) {
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400385 if (--nlmsvc_users) {
386 lockd_down_net(current->nsproxy->net_ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 goto out;
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400388 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500389 } else {
390 printk(KERN_ERR "lockd_down: no users! task=%p\n",
391 nlmsvc_task);
392 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
Jeff Laytond751a7c2008-02-07 16:34:55 -0500395 if (!nlmsvc_task) {
396 printk(KERN_ERR "lockd_down: no lockd running.\n");
397 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500399 kthread_stop(nlmsvc_task);
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400400 svc_exit_thread(nlmsvc_rqst);
401 nlmsvc_task = NULL;
402 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800404 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
Trond Myklebust2de59872008-12-23 15:21:33 -0500406EXPORT_SYMBOL_GPL(lockd_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Chuck Lever90d5b182008-03-14 14:18:30 -0400408#ifdef CONFIG_SYSCTL
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/*
411 * Sysctl parameters (same as module parameters, different interface).
412 */
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414static ctl_table nlm_sysctls[] = {
415 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 .procname = "nlm_grace_period",
417 .data = &nlm_grace_period,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700418 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800420 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 .extra1 = (unsigned long *) &nlm_grace_period_min,
422 .extra2 = (unsigned long *) &nlm_grace_period_max,
423 },
424 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 .procname = "nlm_timeout",
426 .data = &nlm_timeout,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700427 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800429 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 .extra1 = (unsigned long *) &nlm_timeout_min,
431 .extra2 = (unsigned long *) &nlm_timeout_max,
432 },
433 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 .procname = "nlm_udpport",
435 .data = &nlm_udpport,
436 .maxlen = sizeof(int),
437 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800438 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 .extra1 = (int *) &nlm_port_min,
440 .extra2 = (int *) &nlm_port_max,
441 },
442 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 .procname = "nlm_tcpport",
444 .data = &nlm_tcpport,
445 .maxlen = sizeof(int),
446 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800447 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 .extra1 = (int *) &nlm_port_min,
449 .extra2 = (int *) &nlm_port_max,
450 },
Olaf Kirchabd1f502006-10-04 02:16:01 -0700451 {
Olaf Kirchabd1f502006-10-04 02:16:01 -0700452 .procname = "nsm_use_hostnames",
453 .data = &nsm_use_hostnames,
454 .maxlen = sizeof(int),
455 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800456 .proc_handler = proc_dointvec,
Olaf Kirchabd1f502006-10-04 02:16:01 -0700457 },
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700458 {
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700459 .procname = "nsm_local_state",
460 .data = &nsm_local_state,
461 .maxlen = sizeof(int),
462 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800463 .proc_handler = proc_dointvec,
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700464 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800465 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466};
467
468static ctl_table nlm_sysctl_dir[] = {
469 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 .procname = "nfs",
471 .mode = 0555,
472 .child = nlm_sysctls,
473 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800474 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475};
476
477static ctl_table nlm_sysctl_root[] = {
478 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 .procname = "fs",
480 .mode = 0555,
481 .child = nlm_sysctl_dir,
482 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800483 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484};
485
Chuck Lever90d5b182008-03-14 14:18:30 -0400486#endif /* CONFIG_SYSCTL */
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100489 * Module (and sysfs) parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 */
491
492#define param_set_min_max(name, type, which_strtol, min, max) \
493static int param_set_##name(const char *val, struct kernel_param *kp) \
494{ \
495 char *endp; \
496 __typeof__(type) num = which_strtol(val, &endp, 0); \
497 if (endp == val || *endp || num < (min) || num > (max)) \
498 return -EINVAL; \
NeilBrownde5b8e82012-02-07 15:35:42 +1100499 *((type *) kp->arg) = num; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 return 0; \
501}
502
503static inline int is_callback(u32 proc)
504{
505 return proc == NLMPROC_GRANTED
506 || proc == NLMPROC_GRANTED_MSG
507 || proc == NLMPROC_TEST_RES
508 || proc == NLMPROC_LOCK_RES
509 || proc == NLMPROC_CANCEL_RES
510 || proc == NLMPROC_UNLOCK_RES
511 || proc == NLMPROC_NSM_NOTIFY;
512}
513
514
515static int lockd_authenticate(struct svc_rqst *rqstp)
516{
517 rqstp->rq_client = NULL;
518 switch (rqstp->rq_authop->flavour) {
519 case RPC_AUTH_NULL:
520 case RPC_AUTH_UNIX:
521 if (rqstp->rq_proc == 0)
522 return SVC_OK;
523 if (is_callback(rqstp->rq_proc)) {
524 /* Leave it to individual procedures to
525 * call nlmsvc_lookup_host(rqstp)
526 */
527 return SVC_OK;
528 }
529 return svc_set_client(rqstp);
530 }
531 return SVC_DENIED;
532}
533
534
535param_set_min_max(port, int, simple_strtol, 0, 65535)
536param_set_min_max(grace_period, unsigned long, simple_strtoul,
537 nlm_grace_period_min, nlm_grace_period_max)
538param_set_min_max(timeout, unsigned long, simple_strtoul,
539 nlm_timeout_min, nlm_timeout_max)
540
541MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
542MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
543MODULE_LICENSE("GPL");
544
545module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
546 &nlm_grace_period, 0644);
547module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
548 &nlm_timeout, 0644);
549module_param_call(nlm_udpport, param_set_port, param_get_int,
550 &nlm_udpport, 0644);
551module_param_call(nlm_tcpport, param_set_port, param_get_int,
552 &nlm_tcpport, 0644);
Olaf Kirchabd1f502006-10-04 02:16:01 -0700553module_param(nsm_use_hostnames, bool, 0644);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400554module_param(nlm_max_connections, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400556static int lockd_init_net(struct net *net)
557{
558 return 0;
559}
560
561static void lockd_exit_net(struct net *net)
562{
563}
564
565static struct pernet_operations lockd_net_ops = {
566 .init = lockd_init_net,
567 .exit = lockd_exit_net,
568 .id = &lockd_net_id,
569 .size = sizeof(struct lockd_net),
570};
571
572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573/*
574 * Initialising and terminating the module.
575 */
576
577static int __init init_nlm(void)
578{
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400579 int err;
580
Chuck Lever90d5b182008-03-14 14:18:30 -0400581#ifdef CONFIG_SYSCTL
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400582 err = -ENOMEM;
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800583 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400584 if (nlm_sysctl_table == NULL)
585 goto err_sysctl;
Chuck Lever90d5b182008-03-14 14:18:30 -0400586#endif
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400587 err = register_pernet_subsys(&lockd_net_ops);
588 if (err)
589 goto err_pernet;
590 return 0;
591
592err_pernet:
593#ifdef CONFIG_SYSCTL
594 unregister_sysctl_table(nlm_sysctl_table);
595#endif
596err_sysctl:
597 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
600static void __exit exit_nlm(void)
601{
602 /* FIXME: delete all NLM clients */
603 nlm_shutdown_hosts();
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400604 unregister_pernet_subsys(&lockd_net_ops);
Chuck Lever90d5b182008-03-14 14:18:30 -0400605#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 unregister_sysctl_table(nlm_sysctl_table);
Chuck Lever90d5b182008-03-14 14:18:30 -0400607#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
610module_init(init_nlm);
611module_exit(exit_nlm);
612
613/*
614 * Define NLM program and procedures
615 */
616static struct svc_version nlmsvc_version1 = {
617 .vs_vers = 1,
618 .vs_nproc = 17,
619 .vs_proc = nlmsvc_procedures,
620 .vs_xdrsize = NLMSVC_XDRSIZE,
621};
622static struct svc_version nlmsvc_version3 = {
623 .vs_vers = 3,
624 .vs_nproc = 24,
625 .vs_proc = nlmsvc_procedures,
626 .vs_xdrsize = NLMSVC_XDRSIZE,
627};
628#ifdef CONFIG_LOCKD_V4
629static struct svc_version nlmsvc_version4 = {
630 .vs_vers = 4,
631 .vs_nproc = 24,
632 .vs_proc = nlmsvc_procedures4,
633 .vs_xdrsize = NLMSVC_XDRSIZE,
634};
635#endif
636static struct svc_version * nlmsvc_version[] = {
637 [1] = &nlmsvc_version1,
638 [3] = &nlmsvc_version3,
639#ifdef CONFIG_LOCKD_V4
640 [4] = &nlmsvc_version4,
641#endif
642};
643
644static struct svc_stat nlmsvc_stats;
645
Tobias Klausere8c96f82006-03-24 03:15:34 -0800646#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647static struct svc_program nlmsvc_program = {
648 .pg_prog = NLM_PROGRAM, /* program number */
649 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
650 .pg_vers = nlmsvc_version, /* version table */
651 .pg_name = "lockd", /* service name */
652 .pg_class = "nfsd", /* share authentication with nfsd */
653 .pg_stats = &nlmsvc_stats, /* stats table */
654 .pg_authenticate = &lockd_authenticate /* export authentication */
655};