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 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 = container_of(grace, struct delayed_work,
  98                                                   work);
  99         struct lockd_net *ln = container_of(dwork, struct lockd_net,
 100                                             grace_period_end);
 101
 102         locks_end_grace(&ln->lockd_manager);
 103 }
 104
 105 static void set_grace_period(struct net *net)
 106 {
 107         unsigned long grace_period = get_lockd_grace_period();
 108         struct lockd_net *ln = net_generic(net, lockd_net_id);
 109
 110         locks_start_grace(net, &ln->lockd_manager);
 111         cancel_delayed_work_sync(&ln->grace_period_end);
 112         schedule_delayed_work(&ln->grace_period_end, grace_period);
 113 }
 114
 115 static void restart_grace(void)
 116 {
 117         if (nlmsvc_ops) {
 118                 struct net *net = &init_net;
 119                 struct lockd_net *ln = net_generic(net, lockd_net_id);
 120
 121                 cancel_delayed_work_sync(&ln->grace_period_end);
 122                 locks_end_grace(&ln->lockd_manager);
 123                 nlmsvc_invalidate_all();
 124                 set_grace_period(net);
 125         }
 126 }
 127
 128 /*
 129  * This is the lockd kernel thread
 130  */
 131 static int
 132 lockd(void *vrqstp)
 133 {
 134         int             err = 0;
 135         struct svc_rqst *rqstp = vrqstp;
 136
 137         /* try_to_freeze() is called from svc_recv() */
 138         set_freezable();
 139
 140         /* Allow SIGKILL to tell lockd to drop all of its locks */
 141         allow_signal(SIGKILL);
 142
 143         dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 144
 145         /*
 146          * The main request loop. We don't terminate until the last
 147          * NFS mount or NFS daemon has gone away.
 148          */
 149         while (!kthread_should_stop()) {
 150                 long timeout = MAX_SCHEDULE_TIMEOUT;
 151                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 152
 153                 /* update sv_maxconn if it has changed */
 154                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
 155
 156                 if (signalled()) {
 157                         flush_signals(current);
 158                         restart_grace();
 159                         continue;
 160                 }
 161
 162                 timeout = nlmsvc_retry_blocked();
 163
 164                 /*
 165                  * Find a socket with data available and call its
 166                  * recvfrom routine.
 167                  */
 168                 err = svc_recv(rqstp, timeout);
 169                 if (err == -EAGAIN || err == -EINTR)
 170                         continue;
 171                 dprintk("lockd: request from %s\n",
 172                                 svc_print_addr(rqstp, buf, sizeof(buf)));
 173
 174                 svc_process(rqstp);
 175         }
 176         flush_signals(current);
 177         if (nlmsvc_ops)
 178                 nlmsvc_invalidate_all();
 179         nlm_shutdown_hosts();
 180         return 0;
 181 }
 182
 183 static int create_lockd_listener(struct svc_serv *serv, const char *name,
 184                                  struct net *net, const int family,
 185                                  const unsigned short port)
 186 {
 187         struct svc_xprt *xprt;
 188
 189         xprt = svc_find_xprt(serv, name, net, family, 0);
 190         if (xprt == NULL)
 191                 return svc_create_xprt(serv, name, net, family, port,
 192                                                 SVC_SOCK_DEFAULTS);
 193         svc_xprt_put(xprt);
 194         return 0;
 195 }
 196
 197 static int create_lockd_family(struct svc_serv *serv, struct net *net,
 198                                const int family)
 199 {
 200         int err;
 201
 202         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
 203         if (err < 0)
 204                 return err;
 205
 206         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
 207 }
 208
 209 /*
 210  * Ensure there are active UDP and TCP listeners for lockd.
 211  *
 212  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 213  * local services (such as rpc.statd) still require UDP, and
 214  * some NFS servers do not yet support NLM over TCP.
 215  *
 216  * Returns zero if all listeners are available; otherwise a
 217  * negative errno value is returned.
 218  */
 219 static int make_socks(struct svc_serv *serv, struct net *net)
 220 {
 221         static int warned;
 222         int err;
 223
 224         err = create_lockd_family(serv, net, PF_INET);
 225         if (err < 0)
 226                 goto out_err;
 227
 228         err = create_lockd_family(serv, net, PF_INET6);
 229         if (err < 0 && err != -EAFNOSUPPORT)
 230                 goto out_err;
 231
 232         warned = 0;
 233         return 0;
 234
 235 out_err:
 236         if (warned++ == 0)
 237                 printk(KERN_WARNING
 238                         "lockd_up: makesock failed, error=%d\n", err);
 239         svc_shutdown_net(serv, net);
 240         return err;
 241 }
 242
 243 static int lockd_up_net(struct svc_serv *serv, struct net *net)
 244 {
 245         struct lockd_net *ln = net_generic(net, lockd_net_id);
 246         int error;
 247
 248         if (ln->nlmsvc_users++)
 249                 return 0;
 250
 251         error = svc_bind(serv, net);
 252         if (error)
 253                 goto err_bind;
 254
 255         error = make_socks(serv, net);
 256         if (error < 0)
 257                 goto err_bind;
 258         set_grace_period(net);
 259         dprintk("lockd_up_net: per-net data created; net=%p\n", net);
 260         return 0;
 261
 262 err_bind:
 263         ln->nlmsvc_users--;
 264         return error;
 265 }
 266
 267 static void lockd_down_net(struct svc_serv *serv, struct net *net)
 268 {
 269         struct lockd_net *ln = net_generic(net, lockd_net_id);
 270
 271         if (ln->nlmsvc_users) {
 272                 if (--ln->nlmsvc_users == 0) {
 273                         nlm_shutdown_hosts_net(net);
 274                         cancel_delayed_work_sync(&ln->grace_period_end);
 275                         locks_end_grace(&ln->lockd_manager);
 276                         svc_shutdown_net(serv, net);
 277                         dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
 278                 }
 279         } else {
 280                 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
 281                                 nlmsvc_task, net);
 282                 BUG();
 283         }
 284 }
 285
 286 static int lockd_inetaddr_event(struct notifier_block *this,
 287         unsigned long event, void *ptr)
 288 {
 289         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 290         struct sockaddr_in sin;
 291
 292         if (event != NETDEV_DOWN)
 293                 goto out;
 294
 295         if (nlmsvc_rqst) {
 296                 dprintk("lockd_inetaddr_event: removed %pI4\n",
 297                         &ifa->ifa_local);
 298                 sin.sin_family = AF_INET;
 299                 sin.sin_addr.s_addr = ifa->ifa_local;
 300                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 301                         (struct sockaddr *)&sin);
 302         }
 303
 304 out:
 305         return NOTIFY_DONE;
 306 }
 307
 308 static struct notifier_block lockd_inetaddr_notifier = {
 309         .notifier_call = lockd_inetaddr_event,
 310 };
 311
 312 #if IS_ENABLED(CONFIG_IPV6)
 313 static int lockd_inet6addr_event(struct notifier_block *this,
 314         unsigned long event, void *ptr)
 315 {
 316         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 317         struct sockaddr_in6 sin6;
 318
 319         if (event != NETDEV_DOWN)
 320                 goto out;
 321
 322         if (nlmsvc_rqst) {
 323                 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
 324                 sin6.sin6_family = AF_INET6;
 325                 sin6.sin6_addr = ifa->addr;
 326                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 327                         (struct sockaddr *)&sin6);
 328         }
 329
 330 out:
 331         return NOTIFY_DONE;
 332 }
 333
 334 static struct notifier_block lockd_inet6addr_notifier = {
 335         .notifier_call = lockd_inet6addr_event,
 336 };
 337 #endif
 338
 339 static void lockd_svc_exit_thread(void)
 340 {
 341         unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
 342 #if IS_ENABLED(CONFIG_IPV6)
 343         unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
 344 #endif
 345         svc_exit_thread(nlmsvc_rqst);
 346 }
 347
 348 static int lockd_start_svc(struct svc_serv *serv)
 349 {
 350         int error;
 351
 352         if (nlmsvc_rqst)
 353                 return 0;
 354
 355         /*
 356          * Create the kernel thread and wait for it to start.
 357          */
 358         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 359         if (IS_ERR(nlmsvc_rqst)) {
 360                 error = PTR_ERR(nlmsvc_rqst);
 361                 printk(KERN_WARNING
 362                         "lockd_up: svc_rqst allocation failed, error=%d\n",
 363                         error);
 364                 goto out_rqst;
 365         }
 366
 367         svc_sock_update_bufs(serv);
 368         serv->sv_maxconn = nlm_max_connections;
 369
 370         nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 371         if (IS_ERR(nlmsvc_task)) {
 372                 error = PTR_ERR(nlmsvc_task);
 373                 printk(KERN_WARNING
 374                         "lockd_up: kthread_run failed, error=%d\n", error);
 375                 goto out_task;
 376         }
 377         nlmsvc_rqst->rq_task = nlmsvc_task;
 378         wake_up_process(nlmsvc_task);
 379
 380         dprintk("lockd_up: service started\n");
 381         return 0;
 382
 383 out_task:
 384         lockd_svc_exit_thread();
 385         nlmsvc_task = NULL;
 386 out_rqst:
 387         nlmsvc_rqst = NULL;
 388         return error;
 389 }
 390
 391 static struct svc_serv_ops lockd_sv_ops = {
 392         .svo_shutdown           = svc_rpcb_cleanup,
 393         .svo_enqueue_xprt       = svc_xprt_do_enqueue,
 394 };
 395
 396 static struct svc_serv *lockd_create_svc(void)
 397 {
 398         struct svc_serv *serv;
 399
 400         /*
 401          * Check whether we're already up and running.
 402          */
 403         if (nlmsvc_rqst) {
 404                 /*
 405                  * Note: increase service usage, because later in case of error
 406                  * svc_destroy() will be called.
 407                  */
 408                 svc_get(nlmsvc_rqst->rq_server);
 409                 return nlmsvc_rqst->rq_server;
 410         }
 411
 412         /*
 413          * Sanity check: if there's no pid,
 414          * we should be the first user ...
 415          */
 416         if (nlmsvc_users)
 417                 printk(KERN_WARNING
 418                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 419
 420         if (!nlm_timeout)
 421                 nlm_timeout = LOCKD_DFLT_TIMEO;
 422         nlmsvc_timeout = nlm_timeout * HZ;
 423
 424         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 425         if (!serv) {
 426                 printk(KERN_WARNING "lockd_up: create service failed\n");
 427                 return ERR_PTR(-ENOMEM);
 428         }
 429         register_inetaddr_notifier(&lockd_inetaddr_notifier);
 430 #if IS_ENABLED(CONFIG_IPV6)
 431         register_inet6addr_notifier(&lockd_inet6addr_notifier);
 432 #endif
 433         dprintk("lockd_up: service created\n");
 434         return serv;
 435 }
 436
 437 /*
 438  * Bring up the lockd process if it's not already up.
 439  */
 440 int lockd_up(struct net *net)
 441 {
 442         struct svc_serv *serv;
 443         int error;
 444
 445         mutex_lock(&nlmsvc_mutex);
 446
 447         serv = lockd_create_svc();
 448         if (IS_ERR(serv)) {
 449                 error = PTR_ERR(serv);
 450                 goto err_create;
 451         }
 452
 453         error = lockd_up_net(serv, net);
 454         if (error < 0)
 455                 goto err_net;
 456
 457         error = lockd_start_svc(serv);
 458         if (error < 0)
 459                 goto err_start;
 460
 461         nlmsvc_users++;
 462         /*
 463          * Note: svc_serv structures have an initial use count of 1,
 464          * so we exit through here on both success and failure.
 465          */
 466 err_net:
 467         svc_destroy(serv);
 468 err_create:
 469         mutex_unlock(&nlmsvc_mutex);
 470         return error;
 471
 472 err_start:
 473         lockd_down_net(serv, net);
 474         goto err_net;
 475 }
 476 EXPORT_SYMBOL_GPL(lockd_up);
 477
 478 /*
 479  * Decrement the user count and bring down lockd if we're the last.
 480  */
 481 void
 482 lockd_down(struct net *net)
 483 {
 484         mutex_lock(&nlmsvc_mutex);
 485         lockd_down_net(nlmsvc_rqst->rq_server, net);
 486         if (nlmsvc_users) {
 487                 if (--nlmsvc_users)
 488                         goto out;
 489         } else {
 490                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 491                         nlmsvc_task);
 492                 BUG();
 493         }
 494
 495         if (!nlmsvc_task) {
 496                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 497                 BUG();
 498         }
 499         kthread_stop(nlmsvc_task);
 500         dprintk("lockd_down: service stopped\n");
 501         lockd_svc_exit_thread();
 502         dprintk("lockd_down: service destroyed\n");
 503         nlmsvc_task = NULL;
 504         nlmsvc_rqst = NULL;
 505 out:
 506         mutex_unlock(&nlmsvc_mutex);
 507 }
 508 EXPORT_SYMBOL_GPL(lockd_down);
 509
 510 #ifdef CONFIG_SYSCTL
 511
 512 /*
 513  * Sysctl parameters (same as module parameters, different interface).
 514  */
 515
 516 static struct ctl_table nlm_sysctls[] = {
 517         {
 518                 .procname       = "nlm_grace_period",
 519                 .data           = &nlm_grace_period,
 520                 .maxlen         = sizeof(unsigned long),
 521                 .mode           = 0644,
 522                 .proc_handler   = proc_doulongvec_minmax,
 523                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 524                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 525         },
 526         {
 527                 .procname       = "nlm_timeout",
 528                 .data           = &nlm_timeout,
 529                 .maxlen         = sizeof(unsigned long),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_doulongvec_minmax,
 532                 .extra1         = (unsigned long *) &nlm_timeout_min,
 533                 .extra2         = (unsigned long *) &nlm_timeout_max,
 534         },
 535         {
 536                 .procname       = "nlm_udpport",
 537                 .data           = &nlm_udpport,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = proc_dointvec_minmax,
 541                 .extra1         = (int *) &nlm_port_min,
 542                 .extra2         = (int *) &nlm_port_max,
 543         },
 544         {
 545                 .procname       = "nlm_tcpport",
 546                 .data           = &nlm_tcpport,
 547                 .maxlen         = sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dointvec_minmax,
 550                 .extra1         = (int *) &nlm_port_min,
 551                 .extra2         = (int *) &nlm_port_max,
 552         },
 553         {
 554                 .procname       = "nsm_use_hostnames",
 555                 .data           = &nsm_use_hostnames,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec,
 559         },
 560         {
 561                 .procname       = "nsm_local_state",
 562                 .data           = &nsm_local_state,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec,
 566         },
 567         { }
 568 };
 569
 570 static struct ctl_table nlm_sysctl_dir[] = {
 571         {
 572                 .procname       = "nfs",
 573                 .mode           = 0555,
 574                 .child          = nlm_sysctls,
 575         },
 576         { }
 577 };
 578
 579 static struct ctl_table nlm_sysctl_root[] = {
 580         {
 581                 .procname       = "fs",
 582                 .mode           = 0555,
 583                 .child          = nlm_sysctl_dir,
 584         },
 585         { }
 586 };
 587
 588 #endif  /* CONFIG_SYSCTL */
 589
 590 /*
 591  * Module (and sysfs) parameters.
 592  */
 593
 594 #define param_set_min_max(name, type, which_strtol, min, max)           \
 595 static int param_set_##name(const char *val, struct kernel_param *kp)   \
 596 {                                                                       \
 597         char *endp;                                                     \
 598         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 599         if (endp == val || *endp || num < (min) || num > (max))         \
 600                 return -EINVAL;                                         \
 601         *((type *) kp->arg) = num;                                      \
 602         return 0;                                                       \
 603 }
 604
 605 static inline int is_callback(u32 proc)
 606 {
 607         return proc == NLMPROC_GRANTED
 608                 || proc == NLMPROC_GRANTED_MSG
 609                 || proc == NLMPROC_TEST_RES
 610                 || proc == NLMPROC_LOCK_RES
 611                 || proc == NLMPROC_CANCEL_RES
 612                 || proc == NLMPROC_UNLOCK_RES
 613                 || proc == NLMPROC_NSM_NOTIFY;
 614 }
 615
 616
 617 static int lockd_authenticate(struct svc_rqst *rqstp)
 618 {
 619         rqstp->rq_client = NULL;
 620         switch (rqstp->rq_authop->flavour) {
 621                 case RPC_AUTH_NULL:
 622                 case RPC_AUTH_UNIX:
 623                         if (rqstp->rq_proc == 0)
 624                                 return SVC_OK;
 625                         if (is_callback(rqstp->rq_proc)) {
 626                                 /* Leave it to individual procedures to
 627                                  * call nlmsvc_lookup_host(rqstp)
 628                                  */
 629                                 return SVC_OK;
 630                         }
 631                         return svc_set_client(rqstp);
 632         }
 633         return SVC_DENIED;
 634 }
 635
 636
 637 param_set_min_max(port, int, simple_strtol, 0, 65535)
 638 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 639                   nlm_grace_period_min, nlm_grace_period_max)
 640 param_set_min_max(timeout, unsigned long, simple_strtoul,
 641                   nlm_timeout_min, nlm_timeout_max)
 642
 643 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 644 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 645 MODULE_LICENSE("GPL");
 646
 647 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 648                   &nlm_grace_period, 0644);
 649 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 650                   &nlm_timeout, 0644);
 651 module_param_call(nlm_udpport, param_set_port, param_get_int,
 652                   &nlm_udpport, 0644);
 653 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 654                   &nlm_tcpport, 0644);
 655 module_param(nsm_use_hostnames, bool, 0644);
 656 module_param(nlm_max_connections, uint, 0644);
 657
 658 static int lockd_init_net(struct net *net)
 659 {
 660         struct lockd_net *ln = net_generic(net, lockd_net_id);
 661
 662         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 663         INIT_LIST_HEAD(&ln->lockd_manager.list);
 664         ln->lockd_manager.block_opens = false;
 665         INIT_LIST_HEAD(&ln->nsm_handles);
 666         return 0;
 667 }
 668
 669 static void lockd_exit_net(struct net *net)
 670 {
 671 }
 672
 673 static struct pernet_operations lockd_net_ops = {
 674         .init = lockd_init_net,
 675         .exit = lockd_exit_net,
 676         .id = &lockd_net_id,
 677         .size = sizeof(struct lockd_net),
 678 };
 679
 680
 681 /*
 682  * Initialising and terminating the module.
 683  */
 684
 685 static int __init init_nlm(void)
 686 {
 687         int err;
 688
 689 #ifdef CONFIG_SYSCTL
 690         err = -ENOMEM;
 691         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 692         if (nlm_sysctl_table == NULL)
 693                 goto err_sysctl;
 694 #endif
 695         err = register_pernet_subsys(&lockd_net_ops);
 696         if (err)
 697                 goto err_pernet;
 698
 699         err = lockd_create_procfs();
 700         if (err)
 701                 goto err_procfs;
 702
 703         return 0;
 704
 705 err_procfs:
 706         unregister_pernet_subsys(&lockd_net_ops);
 707 err_pernet:
 708 #ifdef CONFIG_SYSCTL
 709         unregister_sysctl_table(nlm_sysctl_table);
 710 err_sysctl:
 711 #endif
 712         return err;
 713 }
 714
 715 static void __exit exit_nlm(void)
 716 {
 717         /* FIXME: delete all NLM clients */
 718         nlm_shutdown_hosts();
 719         lockd_remove_procfs();
 720         unregister_pernet_subsys(&lockd_net_ops);
 721 #ifdef CONFIG_SYSCTL
 722         unregister_sysctl_table(nlm_sysctl_table);
 723 #endif
 724 }
 725
 726 module_init(init_nlm);
 727 module_exit(exit_nlm);
 728
 729 /*
 730  * Define NLM program and procedures
 731  */
 732 static struct svc_version       nlmsvc_version1 = {
 733                 .vs_vers        = 1,
 734                 .vs_nproc       = 17,
 735                 .vs_proc        = nlmsvc_procedures,
 736                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 737 };
 738 static struct svc_version       nlmsvc_version3 = {
 739                 .vs_vers        = 3,
 740                 .vs_nproc       = 24,
 741                 .vs_proc        = nlmsvc_procedures,
 742                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 743 };
 744 #ifdef CONFIG_LOCKD_V4
 745 static struct svc_version       nlmsvc_version4 = {
 746                 .vs_vers        = 4,
 747                 .vs_nproc       = 24,
 748                 .vs_proc        = nlmsvc_procedures4,
 749                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 750 };
 751 #endif
 752 static struct svc_version *     nlmsvc_version[] = {
 753         [1] = &nlmsvc_version1,
 754         [3] = &nlmsvc_version3,
 755 #ifdef CONFIG_LOCKD_V4
 756         [4] = &nlmsvc_version4,
 757 #endif
 758 };
 759
 760 static struct svc_stat          nlmsvc_stats;
 761
 762 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 763 static struct svc_program       nlmsvc_program = {
 764         .pg_prog                = NLM_PROGRAM,          /* program number */
 765         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 766         .pg_vers                = nlmsvc_version,       /* version table */
 767         .pg_name                = "lockd",              /* service name */
 768         .pg_class               = "nfsd",               /* share authentication with nfsd */
 769         .pg_stats               = &nlmsvc_stats,        /* stats table */
 770         .pg_authenticate = &lockd_authenticate  /* export authentication */
 771 };