fs/lockd/svc.c

   1 /*
   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
  15 #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>
  24 #include <linux/smp.h>
  25 #include <linux/mutex.h>
  26 #include <linux/kthread.h>
  27 #include <linux/freezer.h>
  28 #include <linux/inetdevice.h>
  29
  30 #include <linux/sunrpc/types.h>
  31 #include <linux/sunrpc/stats.h>
  32 #include <linux/sunrpc/clnt.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/sunrpc/svc_xprt.h>
  36 #include <net/ip.h>
  37 #include <net/addrconf.h>
  38 #include <net/ipv6.h>
  39 #include <linux/lockd/lockd.h>
  40 #include <linux/nfs.h>
  41
  42 #include "netns.h"
  43 #include "procfs.h"
  44
  45 #define NLMDBG_FACILITY         NLMDBG_SVC
  46 #define LOCKD_BUFSIZE           (1024 + NLMSVC_XDRSIZE)
  47 #define ALLOWED_SIGS            (sigmask(SIGKILL))
  48
  49 static struct svc_program       nlmsvc_program;
  50
  51 const struct nlmsvc_binding     *nlmsvc_ops;
  52 EXPORT_SYMBOL_GPL(nlmsvc_ops);
  53
  54 static DEFINE_MUTEX(nlmsvc_mutex);
  55 static unsigned int             nlmsvc_users;
  56 static struct task_struct       *nlmsvc_task;
  57 static struct svc_rqst          *nlmsvc_rqst;
  58 unsigned long                   nlmsvc_timeout;
  59
  60 int lockd_net_id;
  61
  62 /*
  63  * These can be set at insmod time (useful for NFS as root filesystem),
  64  * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
  65  */
  66 static unsigned long            nlm_grace_period;
  67 static unsigned long            nlm_timeout = LOCKD_DFLT_TIMEO;
  68 static int                      nlm_udpport, nlm_tcpport;
  69
  70 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
  71 static unsigned int             nlm_max_connections = 1024;
  72
  73 /*
  74  * Constants needed for the sysctl interface.
  75  */
  76 static const unsigned long      nlm_grace_period_min = 0;
  77 static const unsigned long      nlm_grace_period_max = 240;
  78 static const unsigned long      nlm_timeout_min = 3;
  79 static const unsigned long      nlm_timeout_max = 20;
  80 static const int                nlm_port_min = 0, nlm_port_max = 65535;
  81
  82 #ifdef CONFIG_SYSCTL
  83 static struct ctl_table_header * nlm_sysctl_table;
  84 #endif
  85
  86 static unsigned long get_lockd_grace_period(void)
  87 {
  88         /* Note: nlm_timeout should always be nonzero */
  89         if (nlm_grace_period)
  90                 return roundup(nlm_grace_period, nlm_timeout) * HZ;
  91         else
  92                 return nlm_timeout * 5 * HZ;
  93 }
  94
  95 static void grace_ender(struct work_struct *grace)
  96 {
  97         struct delayed_work *dwork = to_delayed_work(grace);
  98         struct lockd_net *ln = container_of(dwork, struct lockd_net,
  99                                             grace_period_end);
 100
 101         locks_end_grace(&ln->lockd_manager);
 102 }
 103
 104 static void set_grace_period(struct net *net)
 105 {
 106         unsigned long grace_period = get_lockd_grace_period();
 107         struct lockd_net *ln = net_generic(net, lockd_net_id);
 108
 109         locks_start_grace(net, &ln->lockd_manager);
 110         cancel_delayed_work_sync(&ln->grace_period_end);
 111         schedule_delayed_work(&ln->grace_period_end, grace_period);
 112 }
 113
 114 static void restart_grace(void)
 115 {
 116         if (nlmsvc_ops) {
 117                 struct net *net = &init_net;
 118                 struct lockd_net *ln = net_generic(net, lockd_net_id);
 119
 120                 cancel_delayed_work_sync(&ln->grace_period_end);
 121                 locks_end_grace(&ln->lockd_manager);
 122                 nlmsvc_invalidate_all();
 123                 set_grace_period(net);
 124         }
 125 }
 126
 127 /*
 128  * This is the lockd kernel thread
 129  */
 130 static int
 131 lockd(void *vrqstp)
 132 {
 133         int             err = 0;
 134         struct svc_rqst *rqstp = vrqstp;
 135
 136         /* try_to_freeze() is called from svc_recv() */
 137         set_freezable();
 138
 139         /* Allow SIGKILL to tell lockd to drop all of its locks */
 140         allow_signal(SIGKILL);
 141
 142         dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 143
 144         /*
 145          * The main request loop. We don't terminate until the last
 146          * NFS mount or NFS daemon has gone away.
 147          */
 148         while (!kthread_should_stop()) {
 149                 long timeout = MAX_SCHEDULE_TIMEOUT;
 150                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 151
 152                 /* update sv_maxconn if it has changed */
 153                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
 154
 155                 if (signalled()) {
 156                         flush_signals(current);
 157                         restart_grace();
 158                         continue;
 159                 }
 160
 161                 timeout = nlmsvc_retry_blocked();
 162
 163                 /*
 164                  * Find a socket with data available and call its
 165                  * recvfrom routine.
 166                  */
 167                 err = svc_recv(rqstp, timeout);
 168                 if (err == -EAGAIN || err == -EINTR)
 169                         continue;
 170                 dprintk("lockd: request from %s\n",
 171                                 svc_print_addr(rqstp, buf, sizeof(buf)));
 172
 173                 svc_process(rqstp);
 174         }
 175         flush_signals(current);
 176         if (nlmsvc_ops)
 177                 nlmsvc_invalidate_all();
 178         nlm_shutdown_hosts();
 179         return 0;
 180 }
 181
 182 static int create_lockd_listener(struct svc_serv *serv, const char *name,
 183                                  struct net *net, const int family,
 184                                  const unsigned short port)
 185 {
 186         struct svc_xprt *xprt;
 187
 188         xprt = svc_find_xprt(serv, name, net, family, 0);
 189         if (xprt == NULL)
 190                 return svc_create_xprt(serv, name, net, family, port,
 191                                                 SVC_SOCK_DEFAULTS);
 192         svc_xprt_put(xprt);
 193         return 0;
 194 }
 195
 196 static int create_lockd_family(struct svc_serv *serv, struct net *net,
 197                                const int family)
 198 {
 199         int err;
 200
 201         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
 202         if (err < 0)
 203                 return err;
 204
 205         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
 206 }
 207
 208 /*
 209  * 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.
 217  */
 218 static int make_socks(struct svc_serv *serv, struct net *net)
 219 {
 220         static int warned;
 221         int err;
 222
 223         err = create_lockd_family(serv, net, PF_INET);
 224         if (err < 0)
 225                 goto out_err;
 226
 227         err = create_lockd_family(serv, net, PF_INET6);
 228         if (err < 0 && err != -EAFNOSUPPORT)
 229                 goto out_err;
 230
 231         warned = 0;
 232         return 0;
 233
 234 out_err:
 235         if (warned++ == 0)
 236                 printk(KERN_WARNING
 237                         "lockd_up: makesock failed, error=%d\n", err);
 238         svc_shutdown_net(serv, net);
 239         return err;
 240 }
 241
 242 static int lockd_up_net(struct svc_serv *serv, struct net *net)
 243 {
 244         struct lockd_net *ln = net_generic(net, lockd_net_id);
 245         int error;
 246
 247         if (ln->nlmsvc_users++)
 248                 return 0;
 249
 250         error = svc_bind(serv, net);
 251         if (error)
 252                 goto err_bind;
 253
 254         error = make_socks(serv, net);
 255         if (error < 0)
 256                 goto err_bind;
 257         set_grace_period(net);
 258         dprintk("lockd_up_net: per-net data created; net=%p\n", net);
 259         return 0;
 260
 261 err_bind:
 262         ln->nlmsvc_users--;
 263         return error;
 264 }
 265
 266 static void lockd_down_net(struct svc_serv *serv, struct net *net)
 267 {
 268         struct lockd_net *ln = net_generic(net, lockd_net_id);
 269
 270         if (ln->nlmsvc_users) {
 271                 if (--ln->nlmsvc_users == 0) {
 272                         nlm_shutdown_hosts_net(net);
 273                         cancel_delayed_work_sync(&ln->grace_period_end);
 274                         locks_end_grace(&ln->lockd_manager);
 275                         svc_shutdown_net(serv, net);
 276                         dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
 277                 }
 278         } else {
 279                 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
 280                                 nlmsvc_task, net);
 281                 BUG();
 282         }
 283 }
 284
 285 static int lockd_inetaddr_event(struct notifier_block *this,
 286         unsigned long event, void *ptr)
 287 {
 288         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 289         struct sockaddr_in sin;
 290
 291         if (event != NETDEV_DOWN)
 292                 goto out;
 293
 294         if (nlmsvc_rqst) {
 295                 dprintk("lockd_inetaddr_event: removed %pI4\n",
 296                         &ifa->ifa_local);
 297                 sin.sin_family = AF_INET;
 298                 sin.sin_addr.s_addr = ifa->ifa_local;
 299                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 300                         (struct sockaddr *)&sin);
 301         }
 302
 303 out:
 304         return NOTIFY_DONE;
 305 }
 306
 307 static struct notifier_block lockd_inetaddr_notifier = {
 308         .notifier_call = lockd_inetaddr_event,
 309 };
 310
 311 #if IS_ENABLED(CONFIG_IPV6)
 312 static int lockd_inet6addr_event(struct notifier_block *this,
 313         unsigned long event, void *ptr)
 314 {
 315         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 316         struct sockaddr_in6 sin6;
 317
 318         if (event != NETDEV_DOWN)
 319                 goto out;
 320
 321         if (nlmsvc_rqst) {
 322                 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
 323                 sin6.sin6_family = AF_INET6;
 324                 sin6.sin6_addr = ifa->addr;
 325                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 326                         (struct sockaddr *)&sin6);
 327         }
 328
 329 out:
 330         return NOTIFY_DONE;
 331 }
 332
 333 static struct notifier_block lockd_inet6addr_notifier = {
 334         .notifier_call = lockd_inet6addr_event,
 335 };
 336 #endif
 337
 338 static void lockd_svc_exit_thread(void)
 339 {
 340         unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
 341 #if IS_ENABLED(CONFIG_IPV6)
 342         unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
 343 #endif
 344         svc_exit_thread(nlmsvc_rqst);
 345 }
 346
 347 static int lockd_start_svc(struct svc_serv *serv)
 348 {
 349         int error;
 350
 351         if (nlmsvc_rqst)
 352                 return 0;
 353
 354         /*
 355          * Create the kernel thread and wait for it to start.
 356          */
 357         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 358         if (IS_ERR(nlmsvc_rqst)) {
 359                 error = PTR_ERR(nlmsvc_rqst);
 360                 printk(KERN_WARNING
 361                         "lockd_up: svc_rqst allocation failed, error=%d\n",
 362                         error);
 363                 goto out_rqst;
 364         }
 365
 366         svc_sock_update_bufs(serv);
 367         serv->sv_maxconn = nlm_max_connections;
 368
 369         nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 370         if (IS_ERR(nlmsvc_task)) {
 371                 error = PTR_ERR(nlmsvc_task);
 372                 printk(KERN_WARNING
 373                         "lockd_up: kthread_run failed, error=%d\n", error);
 374                 goto out_task;
 375         }
 376         nlmsvc_rqst->rq_task = nlmsvc_task;
 377         wake_up_process(nlmsvc_task);
 378
 379         dprintk("lockd_up: service started\n");
 380         return 0;
 381
 382 out_task:
 383         lockd_svc_exit_thread();
 384         nlmsvc_task = NULL;
 385 out_rqst:
 386         nlmsvc_rqst = NULL;
 387         return error;
 388 }
 389
 390 static struct svc_serv_ops lockd_sv_ops = {
 391         .svo_shutdown           = svc_rpcb_cleanup,
 392         .svo_enqueue_xprt       = svc_xprt_do_enqueue,
 393 };
 394
 395 static struct svc_serv *lockd_create_svc(void)
 396 {
 397         struct svc_serv *serv;
 398
 399         /*
 400          * Check whether we're already up and running.
 401          */
 402         if (nlmsvc_rqst) {
 403                 /*
 404                  * Note: increase service usage, because later in case of error
 405                  * svc_destroy() will be called.
 406                  */
 407                 svc_get(nlmsvc_rqst->rq_server);
 408                 return nlmsvc_rqst->rq_server;
 409         }
 410
 411         /*
 412          * Sanity check: if there's no pid,
 413          * we should be the first user ...
 414          */
 415         if (nlmsvc_users)
 416                 printk(KERN_WARNING
 417                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 418
 419         if (!nlm_timeout)
 420                 nlm_timeout = LOCKD_DFLT_TIMEO;
 421         nlmsvc_timeout = nlm_timeout * HZ;
 422
 423         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 424         if (!serv) {
 425                 printk(KERN_WARNING "lockd_up: create service failed\n");
 426                 return ERR_PTR(-ENOMEM);
 427         }
 428         register_inetaddr_notifier(&lockd_inetaddr_notifier);
 429 #if IS_ENABLED(CONFIG_IPV6)
 430         register_inet6addr_notifier(&lockd_inet6addr_notifier);
 431 #endif
 432         dprintk("lockd_up: service created\n");
 433         return serv;
 434 }
 435
 436 /*
 437  * Bring up the lockd process if it's not already up.
 438  */
 439 int lockd_up(struct net *net)
 440 {
 441         struct svc_serv *serv;
 442         int error;
 443
 444         mutex_lock(&nlmsvc_mutex);
 445
 446         serv = lockd_create_svc();
 447         if (IS_ERR(serv)) {
 448                 error = PTR_ERR(serv);
 449                 goto err_create;
 450         }
 451
 452         error = lockd_up_net(serv, net);
 453         if (error < 0)
 454                 goto err_net;
 455
 456         error = lockd_start_svc(serv);
 457         if (error < 0)
 458                 goto err_start;
 459
 460         nlmsvc_users++;
 461         /*
 462          * Note: svc_serv structures have an initial use count of 1,
 463          * so we exit through here on both success and failure.
 464          */
 465 err_net:
 466         svc_destroy(serv);
 467 err_create:
 468         mutex_unlock(&nlmsvc_mutex);
 469         return error;
 470
 471 err_start:
 472         lockd_down_net(serv, net);
 473         goto err_net;
 474 }
 475 EXPORT_SYMBOL_GPL(lockd_up);
 476
 477 /*
 478  * Decrement the user count and bring down lockd if we're the last.
 479  */
 480 void
 481 lockd_down(struct net *net)
 482 {
 483         mutex_lock(&nlmsvc_mutex);
 484         lockd_down_net(nlmsvc_rqst->rq_server, net);
 485         if (nlmsvc_users) {
 486                 if (--nlmsvc_users)
 487                         goto out;
 488         } else {
 489                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 490                         nlmsvc_task);
 491                 BUG();
 492         }
 493
 494         if (!nlmsvc_task) {
 495                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 496                 BUG();
 497         }
 498         kthread_stop(nlmsvc_task);
 499         dprintk("lockd_down: service stopped\n");
 500         lockd_svc_exit_thread();
 501         dprintk("lockd_down: service destroyed\n");
 502         nlmsvc_task = NULL;
 503         nlmsvc_rqst = NULL;
 504 out:
 505         mutex_unlock(&nlmsvc_mutex);
 506 }
 507 EXPORT_SYMBOL_GPL(lockd_down);
 508
 509 #ifdef CONFIG_SYSCTL
 510
 511 /*
 512  * Sysctl parameters (same as module parameters, different interface).
 513  */
 514
 515 static struct ctl_table nlm_sysctls[] = {
 516         {
 517                 .procname       = "nlm_grace_period",
 518                 .data           = &nlm_grace_period,
 519                 .maxlen         = sizeof(unsigned long),
 520                 .mode           = 0644,
 521                 .proc_handler   = proc_doulongvec_minmax,
 522                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 523                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 524         },
 525         {
 526                 .procname       = "nlm_timeout",
 527                 .data           = &nlm_timeout,
 528                 .maxlen         = sizeof(unsigned long),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_doulongvec_minmax,
 531                 .extra1         = (unsigned long *) &nlm_timeout_min,
 532                 .extra2         = (unsigned long *) &nlm_timeout_max,
 533         },
 534         {
 535                 .procname       = "nlm_udpport",
 536                 .data           = &nlm_udpport,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_dointvec_minmax,
 540                 .extra1         = (int *) &nlm_port_min,
 541                 .extra2         = (int *) &nlm_port_max,
 542         },
 543         {
 544                 .procname       = "nlm_tcpport",
 545                 .data           = &nlm_tcpport,
 546                 .maxlen         = sizeof(int),
 547                 .mode           = 0644,
 548                 .proc_handler   = proc_dointvec_minmax,
 549                 .extra1         = (int *) &nlm_port_min,
 550                 .extra2         = (int *) &nlm_port_max,
 551         },
 552         {
 553                 .procname       = "nsm_use_hostnames",
 554                 .data           = &nsm_use_hostnames,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec,
 558         },
 559         {
 560                 .procname       = "nsm_local_state",
 561                 .data           = &nsm_local_state,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566         { }
 567 };
 568
 569 static struct ctl_table nlm_sysctl_dir[] = {
 570         {
 571                 .procname       = "nfs",
 572                 .mode           = 0555,
 573                 .child          = nlm_sysctls,
 574         },
 575         { }
 576 };
 577
 578 static struct ctl_table nlm_sysctl_root[] = {
 579         {
 580                 .procname       = "fs",
 581                 .mode           = 0555,
 582                 .child          = nlm_sysctl_dir,
 583         },
 584         { }
 585 };
 586
 587 #endif  /* CONFIG_SYSCTL */
 588
 589 /*
 590  * Module (and sysfs) parameters.
 591  */
 592
 593 #define param_set_min_max(name, type, which_strtol, min, max)           \
 594 static int param_set_##name(const char *val, struct kernel_param *kp)   \
 595 {                                                                       \
 596         char *endp;                                                     \
 597         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 598         if (endp == val || *endp || num < (min) || num > (max))         \
 599                 return -EINVAL;                                         \
 600         *((type *) kp->arg) = num;                                      \
 601         return 0;                                                       \
 602 }
 603
 604 static inline int is_callback(u32 proc)
 605 {
 606         return proc == NLMPROC_GRANTED
 607                 || proc == NLMPROC_GRANTED_MSG
 608                 || proc == NLMPROC_TEST_RES
 609                 || proc == NLMPROC_LOCK_RES
 610                 || proc == NLMPROC_CANCEL_RES
 611                 || proc == NLMPROC_UNLOCK_RES
 612                 || proc == NLMPROC_NSM_NOTIFY;
 613 }
 614
 615
 616 static int lockd_authenticate(struct svc_rqst *rqstp)
 617 {
 618         rqstp->rq_client = NULL;
 619         switch (rqstp->rq_authop->flavour) {
 620                 case RPC_AUTH_NULL:
 621                 case RPC_AUTH_UNIX:
 622                         if (rqstp->rq_proc == 0)
 623                                 return SVC_OK;
 624                         if (is_callback(rqstp->rq_proc)) {
 625                                 /* Leave it to individual procedures to
 626                                  * call nlmsvc_lookup_host(rqstp)
 627                                  */
 628                                 return SVC_OK;
 629                         }
 630                         return svc_set_client(rqstp);
 631         }
 632         return SVC_DENIED;
 633 }
 634
 635
 636 param_set_min_max(port, int, simple_strtol, 0, 65535)
 637 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 638                   nlm_grace_period_min, nlm_grace_period_max)
 639 param_set_min_max(timeout, unsigned long, simple_strtoul,
 640                   nlm_timeout_min, nlm_timeout_max)
 641
 642 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 643 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 644 MODULE_LICENSE("GPL");
 645
 646 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 647                   &nlm_grace_period, 0644);
 648 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 649                   &nlm_timeout, 0644);
 650 module_param_call(nlm_udpport, param_set_port, param_get_int,
 651                   &nlm_udpport, 0644);
 652 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 653                   &nlm_tcpport, 0644);
 654 module_param(nsm_use_hostnames, bool, 0644);
 655 module_param(nlm_max_connections, uint, 0644);
 656
 657 static int lockd_init_net(struct net *net)
 658 {
 659         struct lockd_net *ln = net_generic(net, lockd_net_id);
 660
 661         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 662         INIT_LIST_HEAD(&ln->lockd_manager.list);
 663         ln->lockd_manager.block_opens = false;
 664         INIT_LIST_HEAD(&ln->nsm_handles);
 665         return 0;
 666 }
 667
 668 static void lockd_exit_net(struct net *net)
 669 {
 670 }
 671
 672 static struct pernet_operations lockd_net_ops = {
 673         .init = lockd_init_net,
 674         .exit = lockd_exit_net,
 675         .id = &lockd_net_id,
 676         .size = sizeof(struct lockd_net),
 677 };
 678
 679
 680 /*
 681  * Initialising and terminating the module.
 682  */
 683
 684 static int __init init_nlm(void)
 685 {
 686         int err;
 687
 688 #ifdef CONFIG_SYSCTL
 689         err = -ENOMEM;
 690         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 691         if (nlm_sysctl_table == NULL)
 692                 goto err_sysctl;
 693 #endif
 694         err = register_pernet_subsys(&lockd_net_ops);
 695         if (err)
 696                 goto err_pernet;
 697
 698         err = lockd_create_procfs();
 699         if (err)
 700                 goto err_procfs;
 701
 702         return 0;
 703
 704 err_procfs:
 705         unregister_pernet_subsys(&lockd_net_ops);
 706 err_pernet:
 707 #ifdef CONFIG_SYSCTL
 708         unregister_sysctl_table(nlm_sysctl_table);
 709 err_sysctl:
 710 #endif
 711         return err;
 712 }
 713
 714 static void __exit exit_nlm(void)
 715 {
 716         /* FIXME: delete all NLM clients */
 717         nlm_shutdown_hosts();
 718         lockd_remove_procfs();
 719         unregister_pernet_subsys(&lockd_net_ops);
 720 #ifdef CONFIG_SYSCTL
 721         unregister_sysctl_table(nlm_sysctl_table);
 722 #endif
 723 }
 724
 725 module_init(init_nlm);
 726 module_exit(exit_nlm);
 727
 728 /*
 729  * Define NLM program and procedures
 730  */
 731 static struct svc_version       nlmsvc_version1 = {
 732                 .vs_vers        = 1,
 733                 .vs_nproc       = 17,
 734                 .vs_proc        = nlmsvc_procedures,
 735                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 736 };
 737 static struct svc_version       nlmsvc_version3 = {
 738                 .vs_vers        = 3,
 739                 .vs_nproc       = 24,
 740                 .vs_proc        = nlmsvc_procedures,
 741                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 742 };
 743 #ifdef CONFIG_LOCKD_V4
 744 static struct svc_version       nlmsvc_version4 = {
 745                 .vs_vers        = 4,
 746                 .vs_nproc       = 24,
 747                 .vs_proc        = nlmsvc_procedures4,
 748                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 749 };
 750 #endif
 751 static struct svc_version *     nlmsvc_version[] = {
 752         [1] = &nlmsvc_version1,
 753         [3] = &nlmsvc_version3,
 754 #ifdef CONFIG_LOCKD_V4
 755         [4] = &nlmsvc_version4,
 756 #endif
 757 };
 758
 759 static struct svc_stat          nlmsvc_stats;
 760
 761 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 762 static struct svc_program       nlmsvc_program = {
 763         .pg_prog                = NLM_PROGRAM,          /* program number */
 764         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 765         .pg_vers                = nlmsvc_version,       /* version table */
 766         .pg_name                = "lockd",              /* service name */
 767         .pg_class               = "nfsd",               /* share authentication with nfsd */
 768         .pg_stats               = &nlmsvc_stats,        /* stats table */
 769         .pg_authenticate = &lockd_authenticate  /* export authentication */
 770 };