blob: a2aa97d45670635c4d84ef422ea9a1d794cdce69 [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
Stanislav Kinsbursky08d44a32012-07-25 16:56:50 +040090static void grace_ender(struct work_struct *grace)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Stanislav Kinsbursky08d44a32012-07-25 16:56:50 +040092 struct delayed_work *dwork = container_of(grace, struct delayed_work,
93 work);
94 struct lockd_net *ln = container_of(dwork, struct lockd_net,
95 grace_period_end);
96
97 locks_end_grace(&ln->lockd_manager);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +0400100static void set_grace_period(struct net *net)
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400101{
J. Bruce Fieldsaf558e32007-09-06 12:34:25 -0400102 unsigned long grace_period = get_lockd_grace_period();
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +0400103 struct lockd_net *ln = net_generic(net, lockd_net_id);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400104
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +0400105 locks_start_grace(net, &ln->lockd_manager);
Stanislav Kinsbursky66547b02012-07-25 16:56:43 +0400106 cancel_delayed_work_sync(&ln->grace_period_end);
107 schedule_delayed_work(&ln->grace_period_end, grace_period);
J. Bruce Fieldsc8ab5f22008-03-18 19:00:19 -0400108}
109
J. Bruce Fields89996df2009-05-06 16:32:54 -0400110static void restart_grace(void)
111{
112 if (nlmsvc_ops) {
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +0400113 struct net *net = &init_net;
114 struct lockd_net *ln = net_generic(net, lockd_net_id);
Stanislav Kinsbursky66547b02012-07-25 16:56:43 +0400115
116 cancel_delayed_work_sync(&ln->grace_period_end);
Stanislav Kinsbursky08d44a32012-07-25 16:56:50 +0400117 locks_end_grace(&ln->lockd_manager);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400118 nlmsvc_invalidate_all();
Stanislav Kinsbursky5ccb0062012-07-25 16:57:22 +0400119 set_grace_period(net);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400120 }
121}
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/*
124 * This is the lockd kernel thread
125 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500126static int
127lockd(void *vrqstp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
J. Bruce Fields5b444cc2012-08-17 21:47:53 -0400129 int err = 0;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500130 struct svc_rqst *rqstp = vrqstp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Jeff Laytond751a7c2008-02-07 16:34:55 -0500132 /* try_to_freeze() is called from svc_recv() */
Rafael J. Wysocki83144182007-07-17 04:03:35 -0700133 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Jeff Laytond751a7c2008-02-07 16:34:55 -0500135 /* Allow SIGKILL to tell lockd to drop all of its locks */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 allow_signal(SIGKILL);
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
139
140 if (!nlm_timeout)
141 nlm_timeout = LOCKD_DFLT_TIMEO;
142 nlmsvc_timeout = nlm_timeout * HZ;
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 /*
145 * The main request loop. We don't terminate until the last
Jeff Laytond751a7c2008-02-07 16:34:55 -0500146 * NFS mount or NFS daemon has gone away.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 */
Jeff Laytond751a7c2008-02-07 16:34:55 -0500148 while (!kthread_should_stop()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 long timeout = MAX_SCHEDULE_TIMEOUT;
Pavel Emelyanov5216a8e2008-02-21 10:57:45 +0300150 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Jeff Laytonc72a4762008-10-20 11:51:58 -0400152 /* update sv_maxconn if it has changed */
153 rqstp->rq_server->sv_maxconn = nlm_max_connections;
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if (signalled()) {
156 flush_signals(current);
J. Bruce Fields89996df2009-05-06 16:32:54 -0400157 restart_grace();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500158 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 }
160
J. Bruce Fields8fafa902008-01-24 11:11:34 -0500161 timeout = nlmsvc_retry_blocked();
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 /*
164 * Find a socket with data available and call its
165 * recvfrom routine.
166 */
NeilBrown6fb2b472006-10-02 02:17:50 -0700167 err = svc_recv(rqstp, timeout);
J. Bruce Fields5b444cc2012-08-17 21:47:53 -0400168 if (err == -EAGAIN || err == -EINTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 continue;
Chuck Leverad06e4b2007-02-12 00:53:32 -0800170 dprintk("lockd: request from %s\n",
171 svc_print_addr(rqstp, buf, sizeof(buf)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
NeilBrown6fb2b472006-10-02 02:17:50 -0700173 svc_process(rqstp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
Trond Myklebust2bd61572006-01-03 09:55:19 +0100175 flush_signals(current);
Jeff Laytond751a7c2008-02-07 16:34:55 -0500176 if (nlmsvc_ops)
177 nlmsvc_invalidate_all();
178 nlm_shutdown_hosts();
Jeff Laytond751a7c2008-02-07 16:34:55 -0500179 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180}
181
Chuck Levereb16e902009-03-18 20:47:59 -0400182static int create_lockd_listener(struct svc_serv *serv, const char *name,
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400183 struct net *net, const int family,
184 const unsigned short port)
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500185{
186 struct svc_xprt *xprt;
187
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400188 xprt = svc_find_xprt(serv, name, net, family, 0);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500189 if (xprt == NULL)
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400190 return svc_create_xprt(serv, name, net, family, port,
Chuck Levereb16e902009-03-18 20:47:59 -0400191 SVC_SOCK_DEFAULTS);
Chuck Leverd3fe5ea2008-12-31 16:06:04 -0500192 svc_xprt_put(xprt);
193 return 0;
194}
195
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400196static int create_lockd_family(struct svc_serv *serv, struct net *net,
197 const int family)
Chuck Levereb16e902009-03-18 20:47:59 -0400198{
199 int err;
200
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400201 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
Chuck Levereb16e902009-03-18 20:47:59 -0400202 if (err < 0)
203 return err;
204
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400205 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
Chuck Levereb16e902009-03-18 20:47:59 -0400206}
207
Chuck Lever482fb942007-02-12 00:53:29 -0800208/*
Chuck Lever8c3916f2008-10-03 17:15:23 -0400209 * Ensure there are active UDP and TCP listeners for lockd.
210 *
211 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
212 * local services (such as rpc.statd) still require UDP, and
213 * some NFS servers do not yet support NLM over TCP.
214 *
215 * Returns zero if all listeners are available; otherwise a
216 * negative errno value is returned.
Chuck Lever482fb942007-02-12 00:53:29 -0800217 */
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400218static int make_socks(struct svc_serv *serv, struct net *net)
NeilBrown24e36662006-10-02 02:17:45 -0700219{
Chuck Lever482fb942007-02-12 00:53:29 -0800220 static int warned;
Chuck Lever0dba7c22008-12-31 16:06:11 -0500221 int err;
Chuck Lever482fb942007-02-12 00:53:29 -0800222
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400223 err = create_lockd_family(serv, net, PF_INET);
Chuck Lever0dba7c22008-12-31 16:06:11 -0500224 if (err < 0)
225 goto out_err;
226
Stanislav Kinsburskyc228fa22012-01-31 15:07:48 +0400227 err = create_lockd_family(serv, net, PF_INET6);
Chuck Levereb16e902009-03-18 20:47:59 -0400228 if (err < 0 && err != -EAFNOSUPPORT)
Chuck Lever0dba7c22008-12-31 16:06:11 -0500229 goto out_err;
230
231 warned = 0;
232 return 0;
233
234out_err:
235 if (warned++ == 0)
NeilBrown7dcf91e2006-10-02 02:17:52 -0700236 printk(KERN_WARNING
Chuck Lever0dba7c22008-12-31 16:06:11 -0500237 "lockd_up: makesock failed, error=%d\n", err);
NeilBrown24e36662006-10-02 02:17:45 -0700238 return err;
239}
240
Stanislav Kinsbursky4db77692012-04-25 18:22:40 +0400241static int lockd_up_net(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400242{
243 struct lockd_net *ln = net_generic(net, lockd_net_id);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400244 int error;
245
Stanislav Kinsbursky786185b2012-05-04 12:49:41 +0400246 if (ln->nlmsvc_users++)
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400247 return 0;
248
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400249 error = svc_bind(serv, net);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400250 if (error)
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400251 goto err_bind;
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400252
253 error = make_socks(serv, net);
254 if (error < 0)
255 goto err_socks;
Stanislav Kinsbursky5630f7f2012-07-25 16:57:29 +0400256 set_grace_period(net);
Stanislav Kinsbursky8dbf28e2012-04-25 18:23:16 +0400257 dprintk("lockd_up_net: per-net data created; net=%p\n", net);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400258 return 0;
259
260err_socks:
261 svc_rpcb_cleanup(serv, net);
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400262err_bind:
Stanislav Kinsbursky786185b2012-05-04 12:49:41 +0400263 ln->nlmsvc_users--;
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400264 return error;
265}
266
Stanislav Kinsbursky4db77692012-04-25 18:22:40 +0400267static void lockd_down_net(struct svc_serv *serv, struct net *net)
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400268{
269 struct lockd_net *ln = net_generic(net, lockd_net_id);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400270
271 if (ln->nlmsvc_users) {
Stanislav Kinsbursky3b647392012-01-31 15:08:29 +0400272 if (--ln->nlmsvc_users == 0) {
273 nlm_shutdown_hosts_net(net);
Stanislav Kinsbursky5630f7f2012-07-25 16:57:29 +0400274 cancel_delayed_work_sync(&ln->grace_period_end);
275 locks_end_grace(&ln->lockd_manager);
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400276 svc_shutdown_net(serv, net);
Stanislav Kinsbursky8dbf28e2012-04-25 18:23:16 +0400277 dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
Stanislav Kinsbursky3b647392012-01-31 15:08:29 +0400278 }
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400279 } else {
280 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
281 nlmsvc_task, net);
282 BUG();
283 }
284}
285
Stanislav Kinsbursky3d1221d2012-04-25 18:23:09 +0400286static int lockd_start_svc(struct svc_serv *serv)
287{
288 int error;
289
290 if (nlmsvc_rqst)
291 return 0;
292
293 /*
294 * Create the kernel thread and wait for it to start.
295 */
296 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
297 if (IS_ERR(nlmsvc_rqst)) {
298 error = PTR_ERR(nlmsvc_rqst);
299 printk(KERN_WARNING
300 "lockd_up: svc_rqst allocation failed, error=%d\n",
301 error);
302 goto out_rqst;
303 }
304
305 svc_sock_update_bufs(serv);
306 serv->sv_maxconn = nlm_max_connections;
307
308 nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
309 if (IS_ERR(nlmsvc_task)) {
310 error = PTR_ERR(nlmsvc_task);
311 printk(KERN_WARNING
312 "lockd_up: kthread_run failed, error=%d\n", error);
313 goto out_task;
314 }
315 dprintk("lockd_up: service started\n");
316 return 0;
317
318out_task:
319 svc_exit_thread(nlmsvc_rqst);
320 nlmsvc_task = NULL;
321out_rqst:
322 nlmsvc_rqst = NULL;
323 return error;
324}
325
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400326static struct svc_serv *lockd_create_svc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
Jeff Laytond751a7c2008-02-07 16:34:55 -0500328 struct svc_serv *serv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 * Check whether we're already up and running.
332 */
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400333 if (nlmsvc_rqst) {
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400334 /*
335 * Note: increase service usage, because later in case of error
336 * svc_destroy() will be called.
337 */
338 svc_get(nlmsvc_rqst->rq_server);
339 return nlmsvc_rqst->rq_server;
Stanislav Kinsburskybb2224d2012-01-31 15:08:05 +0400340 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 /*
343 * Sanity check: if there's no pid,
344 * we should be the first user ...
345 */
NeilBrown4a3ae422006-10-02 02:17:53 -0700346 if (nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 printk(KERN_WARNING
348 "lockd_up: no pid, %d users??\n", nlmsvc_users);
349
Chuck Lever49a90722009-03-18 20:46:29 -0400350 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (!serv) {
352 printk(KERN_WARNING "lockd_up: create service failed\n");
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400353 return ERR_PTR(-ENOMEM);
354 }
Stanislav Kinsbursky8dbf28e2012-04-25 18:23:16 +0400355 dprintk("lockd_up: service created\n");
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400356 return serv;
357}
358
359/*
360 * Bring up the lockd process if it's not already up.
361 */
362int lockd_up(struct net *net)
363{
364 struct svc_serv *serv;
Stanislav Kinsbursky7d13ec72012-04-25 18:23:02 +0400365 int error;
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400366
367 mutex_lock(&nlmsvc_mutex);
368
369 serv = lockd_create_svc();
370 if (IS_ERR(serv)) {
371 error = PTR_ERR(serv);
372 goto err_create;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
374
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400375 error = lockd_up_net(serv, net);
Chuck Lever8c3916f2008-10-03 17:15:23 -0400376 if (error < 0)
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400377 goto err_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Stanislav Kinsbursky3d1221d2012-04-25 18:23:09 +0400379 error = lockd_start_svc(serv);
380 if (error < 0)
Stanislav Kinsbursky786185b2012-05-04 12:49:41 +0400381 goto err_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Stanislav Kinsbursky7d13ec72012-04-25 18:23:02 +0400383 nlmsvc_users++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 /*
385 * Note: svc_serv structures have an initial use count of 1,
386 * so we exit through here on both success and failure.
387 */
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400388err_net:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 svc_destroy(serv);
Stanislav Kinsbursky24452232012-04-25 18:22:54 +0400390err_create:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800391 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return error;
Stanislav Kinsbursky786185b2012-05-04 12:49:41 +0400393
394err_start:
Stanislav Kinsbursky4db77692012-04-25 18:22:40 +0400395 lockd_down_net(serv, net);
Stanislav Kinsburskydbf9b5d72012-04-25 18:22:47 +0400396 goto err_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397}
Trond Myklebust2de59872008-12-23 15:21:33 -0500398EXPORT_SYMBOL_GPL(lockd_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400/*
401 * Decrement the user count and bring down lockd if we're the last.
402 */
403void
Stanislav Kinsburskye3f70ea2012-03-29 18:54:33 +0400404lockd_down(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800406 mutex_lock(&nlmsvc_mutex);
Stanislav Kinsbursky4db77692012-04-25 18:22:40 +0400407 lockd_down_net(nlmsvc_rqst->rq_server, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 if (nlmsvc_users) {
Stanislav Kinsbursky786185b2012-05-04 12:49:41 +0400409 if (--nlmsvc_users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 goto out;
Jeff Laytond751a7c2008-02-07 16:34:55 -0500411 } else {
412 printk(KERN_ERR "lockd_down: no users! task=%p\n",
413 nlmsvc_task);
414 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Jeff Laytond751a7c2008-02-07 16:34:55 -0500417 if (!nlmsvc_task) {
418 printk(KERN_ERR "lockd_down: no lockd running.\n");
419 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
Jeff Laytond751a7c2008-02-07 16:34:55 -0500421 kthread_stop(nlmsvc_task);
Stanislav Kinsbursky8dbf28e2012-04-25 18:23:16 +0400422 dprintk("lockd_down: service stopped\n");
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400423 svc_exit_thread(nlmsvc_rqst);
Stanislav Kinsbursky8dbf28e2012-04-25 18:23:16 +0400424 dprintk("lockd_down: service destroyed\n");
Jeff Laytonabd1ec42008-06-11 10:03:12 -0400425 nlmsvc_task = NULL;
426 nlmsvc_rqst = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427out:
Ingo Molnar353ab6e2006-03-26 01:37:12 -0800428 mutex_unlock(&nlmsvc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
Trond Myklebust2de59872008-12-23 15:21:33 -0500430EXPORT_SYMBOL_GPL(lockd_down);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Chuck Lever90d5b182008-03-14 14:18:30 -0400432#ifdef CONFIG_SYSCTL
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434/*
435 * Sysctl parameters (same as module parameters, different interface).
436 */
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438static ctl_table nlm_sysctls[] = {
439 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 .procname = "nlm_grace_period",
441 .data = &nlm_grace_period,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700442 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800444 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 .extra1 = (unsigned long *) &nlm_grace_period_min,
446 .extra2 = (unsigned long *) &nlm_grace_period_max,
447 },
448 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 .procname = "nlm_timeout",
450 .data = &nlm_timeout,
Steve Dickson7ee91ec2005-07-13 01:10:47 -0700451 .maxlen = sizeof(unsigned long),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800453 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 .extra1 = (unsigned long *) &nlm_timeout_min,
455 .extra2 = (unsigned long *) &nlm_timeout_max,
456 },
457 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 .procname = "nlm_udpport",
459 .data = &nlm_udpport,
460 .maxlen = sizeof(int),
461 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800462 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 .extra1 = (int *) &nlm_port_min,
464 .extra2 = (int *) &nlm_port_max,
465 },
466 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 .procname = "nlm_tcpport",
468 .data = &nlm_tcpport,
469 .maxlen = sizeof(int),
470 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800471 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 .extra1 = (int *) &nlm_port_min,
473 .extra2 = (int *) &nlm_port_max,
474 },
Olaf Kirchabd1f502006-10-04 02:16:01 -0700475 {
Olaf Kirchabd1f502006-10-04 02:16:01 -0700476 .procname = "nsm_use_hostnames",
477 .data = &nsm_use_hostnames,
478 .maxlen = sizeof(int),
479 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800480 .proc_handler = proc_dointvec,
Olaf Kirchabd1f502006-10-04 02:16:01 -0700481 },
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700482 {
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700483 .procname = "nsm_local_state",
484 .data = &nsm_local_state,
485 .maxlen = sizeof(int),
486 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800487 .proc_handler = proc_dointvec,
Olaf Kirch460f5ca2006-10-04 02:16:03 -0700488 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800489 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490};
491
492static ctl_table nlm_sysctl_dir[] = {
493 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 .procname = "nfs",
495 .mode = 0555,
496 .child = nlm_sysctls,
497 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800498 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499};
500
501static ctl_table nlm_sysctl_root[] = {
502 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 .procname = "fs",
504 .mode = 0555,
505 .child = nlm_sysctl_dir,
506 },
Eric W. Biedermanab092032009-11-05 14:25:10 -0800507 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508};
509
Chuck Lever90d5b182008-03-14 14:18:30 -0400510#endif /* CONFIG_SYSCTL */
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +0100513 * Module (and sysfs) parameters.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 */
515
516#define param_set_min_max(name, type, which_strtol, min, max) \
517static int param_set_##name(const char *val, struct kernel_param *kp) \
518{ \
519 char *endp; \
520 __typeof__(type) num = which_strtol(val, &endp, 0); \
521 if (endp == val || *endp || num < (min) || num > (max)) \
522 return -EINVAL; \
NeilBrownde5b8e82012-02-07 15:35:42 +1100523 *((type *) kp->arg) = num; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return 0; \
525}
526
527static inline int is_callback(u32 proc)
528{
529 return proc == NLMPROC_GRANTED
530 || proc == NLMPROC_GRANTED_MSG
531 || proc == NLMPROC_TEST_RES
532 || proc == NLMPROC_LOCK_RES
533 || proc == NLMPROC_CANCEL_RES
534 || proc == NLMPROC_UNLOCK_RES
535 || proc == NLMPROC_NSM_NOTIFY;
536}
537
538
539static int lockd_authenticate(struct svc_rqst *rqstp)
540{
541 rqstp->rq_client = NULL;
542 switch (rqstp->rq_authop->flavour) {
543 case RPC_AUTH_NULL:
544 case RPC_AUTH_UNIX:
545 if (rqstp->rq_proc == 0)
546 return SVC_OK;
547 if (is_callback(rqstp->rq_proc)) {
548 /* Leave it to individual procedures to
549 * call nlmsvc_lookup_host(rqstp)
550 */
551 return SVC_OK;
552 }
553 return svc_set_client(rqstp);
554 }
555 return SVC_DENIED;
556}
557
558
559param_set_min_max(port, int, simple_strtol, 0, 65535)
560param_set_min_max(grace_period, unsigned long, simple_strtoul,
561 nlm_grace_period_min, nlm_grace_period_max)
562param_set_min_max(timeout, unsigned long, simple_strtoul,
563 nlm_timeout_min, nlm_timeout_max)
564
565MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
566MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
567MODULE_LICENSE("GPL");
568
569module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
570 &nlm_grace_period, 0644);
571module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
572 &nlm_timeout, 0644);
573module_param_call(nlm_udpport, param_set_port, param_get_int,
574 &nlm_udpport, 0644);
575module_param_call(nlm_tcpport, param_set_port, param_get_int,
576 &nlm_tcpport, 0644);
Olaf Kirchabd1f502006-10-04 02:16:01 -0700577module_param(nsm_use_hostnames, bool, 0644);
Jeff Laytonc72a4762008-10-20 11:51:58 -0400578module_param(nlm_max_connections, uint, 0644);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400580static int lockd_init_net(struct net *net)
581{
Stanislav Kinsbursky66547b02012-07-25 16:56:43 +0400582 struct lockd_net *ln = net_generic(net, lockd_net_id);
583
584 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
Stanislav Kinsburskydb9c4552012-07-25 16:57:13 +0400585 INIT_LIST_HEAD(&ln->grace_list);
Stanislav Kinsburskye9406db2012-09-18 13:37:12 +0400586 spin_lock_init(&ln->nsm_clnt_lock);
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400587 return 0;
588}
589
590static void lockd_exit_net(struct net *net)
591{
592}
593
594static struct pernet_operations lockd_net_ops = {
595 .init = lockd_init_net,
596 .exit = lockd_exit_net,
597 .id = &lockd_net_id,
598 .size = sizeof(struct lockd_net),
599};
600
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602/*
603 * Initialising and terminating the module.
604 */
605
606static int __init init_nlm(void)
607{
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400608 int err;
609
Chuck Lever90d5b182008-03-14 14:18:30 -0400610#ifdef CONFIG_SYSCTL
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400611 err = -ENOMEM;
Eric W. Biederman0b4d4142007-02-14 00:34:09 -0800612 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400613 if (nlm_sysctl_table == NULL)
614 goto err_sysctl;
Chuck Lever90d5b182008-03-14 14:18:30 -0400615#endif
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400616 err = register_pernet_subsys(&lockd_net_ops);
617 if (err)
618 goto err_pernet;
619 return 0;
620
621err_pernet:
622#ifdef CONFIG_SYSCTL
623 unregister_sysctl_table(nlm_sysctl_table);
624#endif
625err_sysctl:
626 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
629static void __exit exit_nlm(void)
630{
631 /* FIXME: delete all NLM clients */
632 nlm_shutdown_hosts();
Stanislav Kinsburskya9c5d732012-01-31 15:07:57 +0400633 unregister_pernet_subsys(&lockd_net_ops);
Chuck Lever90d5b182008-03-14 14:18:30 -0400634#ifdef CONFIG_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 unregister_sysctl_table(nlm_sysctl_table);
Chuck Lever90d5b182008-03-14 14:18:30 -0400636#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637}
638
639module_init(init_nlm);
640module_exit(exit_nlm);
641
642/*
643 * Define NLM program and procedures
644 */
645static struct svc_version nlmsvc_version1 = {
646 .vs_vers = 1,
647 .vs_nproc = 17,
648 .vs_proc = nlmsvc_procedures,
649 .vs_xdrsize = NLMSVC_XDRSIZE,
650};
651static struct svc_version nlmsvc_version3 = {
652 .vs_vers = 3,
653 .vs_nproc = 24,
654 .vs_proc = nlmsvc_procedures,
655 .vs_xdrsize = NLMSVC_XDRSIZE,
656};
657#ifdef CONFIG_LOCKD_V4
658static struct svc_version nlmsvc_version4 = {
659 .vs_vers = 4,
660 .vs_nproc = 24,
661 .vs_proc = nlmsvc_procedures4,
662 .vs_xdrsize = NLMSVC_XDRSIZE,
663};
664#endif
665static struct svc_version * nlmsvc_version[] = {
666 [1] = &nlmsvc_version1,
667 [3] = &nlmsvc_version3,
668#ifdef CONFIG_LOCKD_V4
669 [4] = &nlmsvc_version4,
670#endif
671};
672
673static struct svc_stat nlmsvc_stats;
674
Tobias Klausere8c96f82006-03-24 03:15:34 -0800675#define NLM_NRVERS ARRAY_SIZE(nlmsvc_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676static struct svc_program nlmsvc_program = {
677 .pg_prog = NLM_PROGRAM, /* program number */
678 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */
679 .pg_vers = nlmsvc_version, /* version table */
680 .pg_name = "lockd", /* service name */
681 .pg_class = "nfsd", /* share authentication with nfsd */
682 .pg_stats = &nlmsvc_stats, /* stats table */
683 .pg_authenticate = &lockd_authenticate /* export authentication */
684};