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         struct net *net = &init_net;
 136         struct lockd_net *ln = net_generic(net, lockd_net_id);
 137
 138         /* try_to_freeze() is called from svc_recv() */
 139         set_freezable();
 140
 141         /* Allow SIGKILL to tell lockd to drop all of its locks */
 142         allow_signal(SIGKILL);
 143
 144         dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 145
 146         /*
 147          * The main request loop. We don't terminate until the last
 148          * NFS mount or NFS daemon has gone away.
 149          */
 150         while (!kthread_should_stop()) {
 151                 long timeout = MAX_SCHEDULE_TIMEOUT;
 152                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 153
 154                 /* update sv_maxconn if it has changed */
 155                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
 156
 157                 if (signalled()) {
 158                         flush_signals(current);
 159                         restart_grace();
 160                         continue;
 161                 }
 162
 163                 timeout = nlmsvc_retry_blocked();
 164
 165                 /*
 166                  * Find a socket with data available and call its
 167                  * recvfrom routine.
 168                  */
 169                 err = svc_recv(rqstp, timeout);
 170                 if (err == -EAGAIN || err == -EINTR)
 171                         continue;
 172                 dprintk("lockd: request from %s\n",
 173                                 svc_print_addr(rqstp, buf, sizeof(buf)));
 174
 175                 svc_process(rqstp);
 176         }
 177         flush_signals(current);
 178         if (nlmsvc_ops)
 179                 nlmsvc_invalidate_all();
 180         nlm_shutdown_hosts();
 181         cancel_delayed_work_sync(&ln->grace_period_end);
 182         locks_end_grace(&ln->lockd_manager);
 183         return 0;
 184 }
 185
 186 static int create_lockd_listener(struct svc_serv *serv, const char *name,
 187                                  struct net *net, const int family,
 188                                  const unsigned short port)
 189 {
 190         struct svc_xprt *xprt;
 191
 192         xprt = svc_find_xprt(serv, name, net, family, 0);
 193         if (xprt == NULL)
 194                 return svc_create_xprt(serv, name, net, family, port,
 195                                                 SVC_SOCK_DEFAULTS);
 196         svc_xprt_put(xprt);
 197         return 0;
 198 }
 199
 200 static int create_lockd_family(struct svc_serv *serv, struct net *net,
 201                                const int family)
 202 {
 203         int err;
 204
 205         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
 206         if (err < 0)
 207                 return err;
 208
 209         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
 210 }
 211
 212 /*
 213  * Ensure there are active UDP and TCP listeners for lockd.
 214  *
 215  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 216  * local services (such as rpc.statd) still require UDP, and
 217  * some NFS servers do not yet support NLM over TCP.
 218  *
 219  * Returns zero if all listeners are available; otherwise a
 220  * negative errno value is returned.
 221  */
 222 static int make_socks(struct svc_serv *serv, struct net *net)
 223 {
 224         static int warned;
 225         int err;
 226
 227         err = create_lockd_family(serv, net, PF_INET);
 228         if (err < 0)
 229                 goto out_err;
 230
 231         err = create_lockd_family(serv, net, PF_INET6);
 232         if (err < 0 && err != -EAFNOSUPPORT)
 233                 goto out_err;
 234
 235         warned = 0;
 236         return 0;
 237
 238 out_err:
 239         if (warned++ == 0)
 240                 printk(KERN_WARNING
 241                         "lockd_up: makesock failed, error=%d\n", err);
 242         svc_shutdown_net(serv, net);
 243         return err;
 244 }
 245
 246 static int lockd_up_net(struct svc_serv *serv, struct net *net)
 247 {
 248         struct lockd_net *ln = net_generic(net, lockd_net_id);
 249         int error;
 250
 251         if (ln->nlmsvc_users++)
 252                 return 0;
 253
 254         error = svc_bind(serv, net);
 255         if (error)
 256                 goto err_bind;
 257
 258         error = make_socks(serv, net);
 259         if (error < 0)
 260                 goto err_bind;
 261         set_grace_period(net);
 262         dprintk("lockd_up_net: per-net data created; net=%p\n", net);
 263         return 0;
 264
 265 err_bind:
 266         ln->nlmsvc_users--;
 267         return error;
 268 }
 269
 270 static void lockd_down_net(struct svc_serv *serv, struct net *net)
 271 {
 272         struct lockd_net *ln = net_generic(net, lockd_net_id);
 273
 274         if (ln->nlmsvc_users) {
 275                 if (--ln->nlmsvc_users == 0) {
 276                         nlm_shutdown_hosts_net(net);
 277                         cancel_delayed_work_sync(&ln->grace_period_end);
 278                         locks_end_grace(&ln->lockd_manager);
 279                         svc_shutdown_net(serv, net);
 280                         dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
 281                 }
 282         } else {
 283                 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
 284                                 nlmsvc_task, net);
 285                 BUG();
 286         }
 287 }
 288
 289 static int lockd_inetaddr_event(struct notifier_block *this,
 290         unsigned long event, void *ptr)
 291 {
 292         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 293         struct sockaddr_in sin;
 294
 295         if (event != NETDEV_DOWN)
 296                 goto out;
 297
 298         if (nlmsvc_rqst) {
 299                 dprintk("lockd_inetaddr_event: removed %pI4\n",
 300                         &ifa->ifa_local);
 301                 sin.sin_family = AF_INET;
 302                 sin.sin_addr.s_addr = ifa->ifa_local;
 303                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 304                         (struct sockaddr *)&sin);
 305         }
 306
 307 out:
 308         return NOTIFY_DONE;
 309 }
 310
 311 static struct notifier_block lockd_inetaddr_notifier = {
 312         .notifier_call = lockd_inetaddr_event,
 313 };
 314
 315 #if IS_ENABLED(CONFIG_IPV6)
 316 static int lockd_inet6addr_event(struct notifier_block *this,
 317         unsigned long event, void *ptr)
 318 {
 319         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 320         struct sockaddr_in6 sin6;
 321
 322         if (event != NETDEV_DOWN)
 323                 goto out;
 324
 325         if (nlmsvc_rqst) {
 326                 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
 327                 sin6.sin6_family = AF_INET6;
 328                 sin6.sin6_addr = ifa->addr;
 329                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 330                         (struct sockaddr *)&sin6);
 331         }
 332
 333 out:
 334         return NOTIFY_DONE;
 335 }
 336
 337 static struct notifier_block lockd_inet6addr_notifier = {
 338         .notifier_call = lockd_inet6addr_event,
 339 };
 340 #endif
 341
 342 static void lockd_unregister_notifiers(void)
 343 {
 344         unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
 345 #if IS_ENABLED(CONFIG_IPV6)
 346         unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
 347 #endif
 348 }
 349
 350 static void lockd_svc_exit_thread(void)
 351 {
 352         lockd_unregister_notifiers();
 353         svc_exit_thread(nlmsvc_rqst);
 354 }
 355
 356 static int lockd_start_svc(struct svc_serv *serv)
 357 {
 358         int error;
 359
 360         if (nlmsvc_rqst)
 361                 return 0;
 362
 363         /*
 364          * Create the kernel thread and wait for it to start.
 365          */
 366         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 367         if (IS_ERR(nlmsvc_rqst)) {
 368                 error = PTR_ERR(nlmsvc_rqst);
 369                 printk(KERN_WARNING
 370                         "lockd_up: svc_rqst allocation failed, error=%d\n",
 371                         error);
 372                 lockd_unregister_notifiers();
 373                 goto out_rqst;
 374         }
 375
 376         svc_sock_update_bufs(serv);
 377         serv->sv_maxconn = nlm_max_connections;
 378
 379         nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 380         if (IS_ERR(nlmsvc_task)) {
 381                 error = PTR_ERR(nlmsvc_task);
 382                 printk(KERN_WARNING
 383                         "lockd_up: kthread_run failed, error=%d\n", error);
 384                 goto out_task;
 385         }
 386         nlmsvc_rqst->rq_task = nlmsvc_task;
 387         wake_up_process(nlmsvc_task);
 388
 389         dprintk("lockd_up: service started\n");
 390         return 0;
 391
 392 out_task:
 393         lockd_svc_exit_thread();
 394         nlmsvc_task = NULL;
 395 out_rqst:
 396         nlmsvc_rqst = NULL;
 397         return error;
 398 }
 399
 400 static struct svc_serv_ops lockd_sv_ops = {
 401         .svo_shutdown           = svc_rpcb_cleanup,
 402         .svo_enqueue_xprt       = svc_xprt_do_enqueue,
 403 };
 404
 405 static struct svc_serv *lockd_create_svc(void)
 406 {
 407         struct svc_serv *serv;
 408
 409         /*
 410          * Check whether we're already up and running.
 411          */
 412         if (nlmsvc_rqst) {
 413                 /*
 414                  * Note: increase service usage, because later in case of error
 415                  * svc_destroy() will be called.
 416                  */
 417                 svc_get(nlmsvc_rqst->rq_server);
 418                 return nlmsvc_rqst->rq_server;
 419         }
 420
 421         /*
 422          * Sanity check: if there's no pid,
 423          * we should be the first user ...
 424          */
 425         if (nlmsvc_users)
 426                 printk(KERN_WARNING
 427                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 428
 429         if (!nlm_timeout)
 430                 nlm_timeout = LOCKD_DFLT_TIMEO;
 431         nlmsvc_timeout = nlm_timeout * HZ;
 432
 433         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 434         if (!serv) {
 435                 printk(KERN_WARNING "lockd_up: create service failed\n");
 436                 return ERR_PTR(-ENOMEM);
 437         }
 438         register_inetaddr_notifier(&lockd_inetaddr_notifier);
 439 #if IS_ENABLED(CONFIG_IPV6)
 440         register_inet6addr_notifier(&lockd_inet6addr_notifier);
 441 #endif
 442         dprintk("lockd_up: service created\n");
 443         return serv;
 444 }
 445
 446 /*
 447  * Bring up the lockd process if it's not already up.
 448  */
 449 int lockd_up(struct net *net)
 450 {
 451         struct svc_serv *serv;
 452         int error;
 453
 454         mutex_lock(&nlmsvc_mutex);
 455
 456         serv = lockd_create_svc();
 457         if (IS_ERR(serv)) {
 458                 error = PTR_ERR(serv);
 459                 goto err_create;
 460         }
 461
 462         error = lockd_up_net(serv, net);
 463         if (error < 0) {
 464                 lockd_unregister_notifiers();
 465                 goto err_put;
 466         }
 467
 468         error = lockd_start_svc(serv);
 469         if (error < 0) {
 470                 lockd_down_net(serv, net);
 471                 goto err_put;
 472         }
 473         nlmsvc_users++;
 474         /*
 475          * Note: svc_serv structures have an initial use count of 1,
 476          * so we exit through here on both success and failure.
 477          */
 478 err_put:
 479         svc_destroy(serv);
 480 err_create:
 481         mutex_unlock(&nlmsvc_mutex);
 482         return error;
 483 }
 484 EXPORT_SYMBOL_GPL(lockd_up);
 485
 486 /*
 487  * Decrement the user count and bring down lockd if we're the last.
 488  */
 489 void
 490 lockd_down(struct net *net)
 491 {
 492         mutex_lock(&nlmsvc_mutex);
 493         lockd_down_net(nlmsvc_rqst->rq_server, net);
 494         if (nlmsvc_users) {
 495                 if (--nlmsvc_users)
 496                         goto out;
 497         } else {
 498                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 499                         nlmsvc_task);
 500                 BUG();
 501         }
 502
 503         if (!nlmsvc_task) {
 504                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 505                 BUG();
 506         }
 507         kthread_stop(nlmsvc_task);
 508         dprintk("lockd_down: service stopped\n");
 509         lockd_svc_exit_thread();
 510         dprintk("lockd_down: service destroyed\n");
 511         nlmsvc_task = NULL;
 512         nlmsvc_rqst = NULL;
 513 out:
 514         mutex_unlock(&nlmsvc_mutex);
 515 }
 516 EXPORT_SYMBOL_GPL(lockd_down);
 517
 518 #ifdef CONFIG_SYSCTL
 519
 520 /*
 521  * Sysctl parameters (same as module parameters, different interface).
 522  */
 523
 524 static struct ctl_table nlm_sysctls[] = {
 525         {
 526                 .procname       = "nlm_grace_period",
 527                 .data           = &nlm_grace_period,
 528                 .maxlen         = sizeof(unsigned long),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_doulongvec_minmax,
 531                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 532                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 533         },
 534         {
 535                 .procname       = "nlm_timeout",
 536                 .data           = &nlm_timeout,
 537                 .maxlen         = sizeof(unsigned long),
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_doulongvec_minmax,
 540                 .extra1         = (unsigned long *) &nlm_timeout_min,
 541                 .extra2         = (unsigned long *) &nlm_timeout_max,
 542         },
 543         {
 544                 .procname       = "nlm_udpport",
 545                 .data           = &nlm_udpport,
 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       = "nlm_tcpport",
 554                 .data           = &nlm_tcpport,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec_minmax,
 558                 .extra1         = (int *) &nlm_port_min,
 559                 .extra2         = (int *) &nlm_port_max,
 560         },
 561         {
 562                 .procname       = "nsm_use_hostnames",
 563                 .data           = &nsm_use_hostnames,
 564                 .maxlen         = sizeof(int),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dointvec,
 567         },
 568         {
 569                 .procname       = "nsm_local_state",
 570                 .data           = &nsm_local_state,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec,
 574         },
 575         { }
 576 };
 577
 578 static struct ctl_table nlm_sysctl_dir[] = {
 579         {
 580                 .procname       = "nfs",
 581                 .mode           = 0555,
 582                 .child          = nlm_sysctls,
 583         },
 584         { }
 585 };
 586
 587 static struct ctl_table nlm_sysctl_root[] = {
 588         {
 589                 .procname       = "fs",
 590                 .mode           = 0555,
 591                 .child          = nlm_sysctl_dir,
 592         },
 593         { }
 594 };
 595
 596 #endif  /* CONFIG_SYSCTL */
 597
 598 /*
 599  * Module (and sysfs) parameters.
 600  */
 601
 602 #define param_set_min_max(name, type, which_strtol, min, max)           \
 603 static int param_set_##name(const char *val, struct kernel_param *kp)   \
 604 {                                                                       \
 605         char *endp;                                                     \
 606         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 607         if (endp == val || *endp || num < (min) || num > (max))         \
 608                 return -EINVAL;                                         \
 609         *((type *) kp->arg) = num;                                      \
 610         return 0;                                                       \
 611 }
 612
 613 static inline int is_callback(u32 proc)
 614 {
 615         return proc == NLMPROC_GRANTED
 616                 || proc == NLMPROC_GRANTED_MSG
 617                 || proc == NLMPROC_TEST_RES
 618                 || proc == NLMPROC_LOCK_RES
 619                 || proc == NLMPROC_CANCEL_RES
 620                 || proc == NLMPROC_UNLOCK_RES
 621                 || proc == NLMPROC_NSM_NOTIFY;
 622 }
 623
 624
 625 static int lockd_authenticate(struct svc_rqst *rqstp)
 626 {
 627         rqstp->rq_client = NULL;
 628         switch (rqstp->rq_authop->flavour) {
 629                 case RPC_AUTH_NULL:
 630                 case RPC_AUTH_UNIX:
 631                         if (rqstp->rq_proc == 0)
 632                                 return SVC_OK;
 633                         if (is_callback(rqstp->rq_proc)) {
 634                                 /* Leave it to individual procedures to
 635                                  * call nlmsvc_lookup_host(rqstp)
 636                                  */
 637                                 return SVC_OK;
 638                         }
 639                         return svc_set_client(rqstp);
 640         }
 641         return SVC_DENIED;
 642 }
 643
 644
 645 param_set_min_max(port, int, simple_strtol, 0, 65535)
 646 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 647                   nlm_grace_period_min, nlm_grace_period_max)
 648 param_set_min_max(timeout, unsigned long, simple_strtoul,
 649                   nlm_timeout_min, nlm_timeout_max)
 650
 651 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 652 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 653 MODULE_LICENSE("GPL");
 654
 655 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 656                   &nlm_grace_period, 0644);
 657 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 658                   &nlm_timeout, 0644);
 659 module_param_call(nlm_udpport, param_set_port, param_get_int,
 660                   &nlm_udpport, 0644);
 661 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 662                   &nlm_tcpport, 0644);
 663 module_param(nsm_use_hostnames, bool, 0644);
 664 module_param(nlm_max_connections, uint, 0644);
 665
 666 static int lockd_init_net(struct net *net)
 667 {
 668         struct lockd_net *ln = net_generic(net, lockd_net_id);
 669
 670         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 671         INIT_LIST_HEAD(&ln->lockd_manager.list);
 672         ln->lockd_manager.block_opens = false;
 673         INIT_LIST_HEAD(&ln->nsm_handles);
 674         return 0;
 675 }
 676
 677 static void lockd_exit_net(struct net *net)
 678 {
 679 }
 680
 681 static struct pernet_operations lockd_net_ops = {
 682         .init = lockd_init_net,
 683         .exit = lockd_exit_net,
 684         .id = &lockd_net_id,
 685         .size = sizeof(struct lockd_net),
 686 };
 687
 688
 689 /*
 690  * Initialising and terminating the module.
 691  */
 692
 693 static int __init init_nlm(void)
 694 {
 695         int err;
 696
 697 #ifdef CONFIG_SYSCTL
 698         err = -ENOMEM;
 699         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 700         if (nlm_sysctl_table == NULL)
 701                 goto err_sysctl;
 702 #endif
 703         err = register_pernet_subsys(&lockd_net_ops);
 704         if (err)
 705                 goto err_pernet;
 706
 707         err = lockd_create_procfs();
 708         if (err)
 709                 goto err_procfs;
 710
 711         return 0;
 712
 713 err_procfs:
 714         unregister_pernet_subsys(&lockd_net_ops);
 715 err_pernet:
 716 #ifdef CONFIG_SYSCTL
 717         unregister_sysctl_table(nlm_sysctl_table);
 718 err_sysctl:
 719 #endif
 720         return err;
 721 }
 722
 723 static void __exit exit_nlm(void)
 724 {
 725         /* FIXME: delete all NLM clients */
 726         nlm_shutdown_hosts();
 727         lockd_remove_procfs();
 728         unregister_pernet_subsys(&lockd_net_ops);
 729 #ifdef CONFIG_SYSCTL
 730         unregister_sysctl_table(nlm_sysctl_table);
 731 #endif
 732 }
 733
 734 module_init(init_nlm);
 735 module_exit(exit_nlm);
 736
 737 /*
 738  * Define NLM program and procedures
 739  */
 740 static struct svc_version       nlmsvc_version1 = {
 741                 .vs_vers        = 1,
 742                 .vs_nproc       = 17,
 743                 .vs_proc        = nlmsvc_procedures,
 744                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 745 };
 746 static struct svc_version       nlmsvc_version3 = {
 747                 .vs_vers        = 3,
 748                 .vs_nproc       = 24,
 749                 .vs_proc        = nlmsvc_procedures,
 750                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 751 };
 752 #ifdef CONFIG_LOCKD_V4
 753 static struct svc_version       nlmsvc_version4 = {
 754                 .vs_vers        = 4,
 755                 .vs_nproc       = 24,
 756                 .vs_proc        = nlmsvc_procedures4,
 757                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 758 };
 759 #endif
 760 static struct svc_version *     nlmsvc_version[] = {
 761         [1] = &nlmsvc_version1,
 762         [3] = &nlmsvc_version3,
 763 #ifdef CONFIG_LOCKD_V4
 764         [4] = &nlmsvc_version4,
 765 #endif
 766 };
 767
 768 static struct svc_stat          nlmsvc_stats;
 769
 770 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 771 static struct svc_program       nlmsvc_program = {
 772         .pg_prog                = NLM_PROGRAM,          /* program number */
 773         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 774         .pg_vers                = nlmsvc_version,       /* version table */
 775         .pg_name                = "lockd",              /* service name */
 776         .pg_class               = "nfsd",               /* share authentication with nfsd */
 777         .pg_stats               = &nlmsvc_stats,        /* stats table */
 778         .pg_authenticate = &lockd_authenticate  /* export authentication */
 779 };