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
  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>
  34 #include <net/ip.h>
  35 #include <linux/lockd/lockd.h>
  36 #include <linux/nfs.h>
  37
  38 #include "netns.h"
  39 #include "procfs.h"
  40
  41 #define NLMDBG_FACILITY         NLMDBG_SVC
  42 #define LOCKD_BUFSIZE           (1024 + NLMSVC_XDRSIZE)
  43 #define ALLOWED_SIGS            (sigmask(SIGKILL))
  44
  45 static struct svc_program       nlmsvc_program;
  46
  47 struct nlmsvc_binding *         nlmsvc_ops;
  48 EXPORT_SYMBOL_GPL(nlmsvc_ops);
  49
  50 static DEFINE_MUTEX(nlmsvc_mutex);
  51 static unsigned int             nlmsvc_users;
  52 static struct task_struct       *nlmsvc_task;
  53 static struct svc_rqst          *nlmsvc_rqst;
  54 unsigned long                   nlmsvc_timeout;
  55
  56 int lockd_net_id;
  57
  58 /*
  59  * These can be set at insmod time (useful for NFS as root filesystem),
  60  * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
  61  */
  62 static unsigned long            nlm_grace_period;
  63 static unsigned long            nlm_timeout = LOCKD_DFLT_TIMEO;
  64 static int                      nlm_udpport, nlm_tcpport;
  65
  66 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
  67 static unsigned int             nlm_max_connections = 1024;
  68
  69 /*
  70  * Constants needed for the sysctl interface.
  71  */
  72 static const unsigned long      nlm_grace_period_min = 0;
  73 static const unsigned long      nlm_grace_period_max = 240;
  74 static const unsigned long      nlm_timeout_min = 3;
  75 static const unsigned long      nlm_timeout_max = 20;
  76 static const int                nlm_port_min = 0, nlm_port_max = 65535;
  77
  78 #ifdef CONFIG_SYSCTL
  79 static struct ctl_table_header * nlm_sysctl_table;
  80 #endif
  81
  82 static unsigned long get_lockd_grace_period(void)
  83 {
  84         /* Note: nlm_timeout should always be nonzero */
  85         if (nlm_grace_period)
  86                 return roundup(nlm_grace_period, nlm_timeout) * HZ;
  87         else
  88                 return nlm_timeout * 5 * HZ;
  89 }
  90
  91 static void grace_ender(struct work_struct *grace)
  92 {
  93         struct delayed_work *dwork = container_of(grace, struct delayed_work,
  94                                                   work);
  95         struct lockd_net *ln = container_of(dwork, struct lockd_net,
  96                                             grace_period_end);
  97
  98         locks_end_grace(&ln->lockd_manager);
  99 }
 100
 101 static void set_grace_period(struct net *net)
 102 {
 103         unsigned long grace_period = get_lockd_grace_period();
 104         struct lockd_net *ln = net_generic(net, lockd_net_id);
 105
 106         locks_start_grace(net, &ln->lockd_manager);
 107         cancel_delayed_work_sync(&ln->grace_period_end);
 108         schedule_delayed_work(&ln->grace_period_end, grace_period);
 109 }
 110
 111 static void restart_grace(void)
 112 {
 113         if (nlmsvc_ops) {
 114                 struct net *net = &init_net;
 115                 struct lockd_net *ln = net_generic(net, lockd_net_id);
 116
 117                 cancel_delayed_work_sync(&ln->grace_period_end);
 118                 locks_end_grace(&ln->lockd_manager);
 119                 nlmsvc_invalidate_all();
 120                 set_grace_period(net);
 121         }
 122 }
 123
 124 /*
 125  * This is the lockd kernel thread
 126  */
 127 static int
 128 lockd(void *vrqstp)
 129 {
 130         int             err = 0;
 131         struct svc_rqst *rqstp = vrqstp;
 132
 133         /* try_to_freeze() is called from svc_recv() */
 134         set_freezable();
 135
 136         /* Allow SIGKILL to tell lockd to drop all of its locks */
 137         allow_signal(SIGKILL);
 138
 139         dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 140
 141         /*
 142          * The main request loop. We don't terminate until the last
 143          * NFS mount or NFS daemon has gone away.
 144          */
 145         while (!kthread_should_stop()) {
 146                 long timeout = MAX_SCHEDULE_TIMEOUT;
 147                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 148
 149                 /* update sv_maxconn if it has changed */
 150                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
 151
 152                 if (signalled()) {
 153                         flush_signals(current);
 154                         restart_grace();
 155                         continue;
 156                 }
 157
 158                 timeout = nlmsvc_retry_blocked();
 159
 160                 /*
 161                  * Find a socket with data available and call its
 162                  * recvfrom routine.
 163                  */
 164                 err = svc_recv(rqstp, timeout);
 165                 if (err == -EAGAIN || err == -EINTR)
 166                         continue;
 167                 dprintk("lockd: request from %s\n",
 168                                 svc_print_addr(rqstp, buf, sizeof(buf)));
 169
 170                 svc_process(rqstp);
 171         }
 172         flush_signals(current);
 173         if (nlmsvc_ops)
 174                 nlmsvc_invalidate_all();
 175         nlm_shutdown_hosts();
 176         return 0;
 177 }
 178
 179 static int create_lockd_listener(struct svc_serv *serv, const char *name,
 180                                  struct net *net, const int family,
 181                                  const unsigned short port)
 182 {
 183         struct svc_xprt *xprt;
 184
 185         xprt = svc_find_xprt(serv, name, net, family, 0);
 186         if (xprt == NULL)
 187                 return svc_create_xprt(serv, name, net, family, port,
 188                                                 SVC_SOCK_DEFAULTS);
 189         svc_xprt_put(xprt);
 190         return 0;
 191 }
 192
 193 static int create_lockd_family(struct svc_serv *serv, struct net *net,
 194                                const int family)
 195 {
 196         int err;
 197
 198         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
 199         if (err < 0)
 200                 return err;
 201
 202         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
 203 }
 204
 205 /*
 206  * Ensure there are active UDP and TCP listeners for lockd.
 207  *
 208  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 209  * local services (such as rpc.statd) still require UDP, and
 210  * some NFS servers do not yet support NLM over TCP.
 211  *
 212  * Returns zero if all listeners are available; otherwise a
 213  * negative errno value is returned.
 214  */
 215 static int make_socks(struct svc_serv *serv, struct net *net)
 216 {
 217         static int warned;
 218         int err;
 219
 220         err = create_lockd_family(serv, net, PF_INET);
 221         if (err < 0)
 222                 goto out_err;
 223
 224         err = create_lockd_family(serv, net, PF_INET6);
 225         if (err < 0 && err != -EAFNOSUPPORT)
 226                 goto out_err;
 227
 228         warned = 0;
 229         return 0;
 230
 231 out_err:
 232         if (warned++ == 0)
 233                 printk(KERN_WARNING
 234                         "lockd_up: makesock failed, error=%d\n", err);
 235         svc_shutdown_net(serv, net);
 236         return err;
 237 }
 238
 239 static int lockd_up_net(struct svc_serv *serv, struct net *net)
 240 {
 241         struct lockd_net *ln = net_generic(net, lockd_net_id);
 242         int error;
 243
 244         if (ln->nlmsvc_users++)
 245                 return 0;
 246
 247         error = svc_bind(serv, net);
 248         if (error)
 249                 goto err_bind;
 250
 251         error = make_socks(serv, net);
 252         if (error < 0)
 253                 goto err_bind;
 254         set_grace_period(net);
 255         dprintk("lockd_up_net: per-net data created; net=%p\n", net);
 256         return 0;
 257
 258 err_bind:
 259         ln->nlmsvc_users--;
 260         return error;
 261 }
 262
 263 static void lockd_down_net(struct svc_serv *serv, struct net *net)
 264 {
 265         struct lockd_net *ln = net_generic(net, lockd_net_id);
 266
 267         if (ln->nlmsvc_users) {
 268                 if (--ln->nlmsvc_users == 0) {
 269                         nlm_shutdown_hosts_net(net);
 270                         cancel_delayed_work_sync(&ln->grace_period_end);
 271                         locks_end_grace(&ln->lockd_manager);
 272                         svc_shutdown_net(serv, net);
 273                         dprintk("lockd_down_net: per-net data destroyed; net=%p\n", net);
 274                 }
 275         } else {
 276                 printk(KERN_ERR "lockd_down_net: no users! task=%p, net=%p\n",
 277                                 nlmsvc_task, net);
 278                 BUG();
 279         }
 280 }
 281
 282 static int lockd_start_svc(struct svc_serv *serv)
 283 {
 284         int error;
 285
 286         if (nlmsvc_rqst)
 287                 return 0;
 288
 289         /*
 290          * Create the kernel thread and wait for it to start.
 291          */
 292         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 293         if (IS_ERR(nlmsvc_rqst)) {
 294                 error = PTR_ERR(nlmsvc_rqst);
 295                 printk(KERN_WARNING
 296                         "lockd_up: svc_rqst allocation failed, error=%d\n",
 297                         error);
 298                 goto out_rqst;
 299         }
 300
 301         svc_sock_update_bufs(serv);
 302         serv->sv_maxconn = nlm_max_connections;
 303
 304         nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 305         if (IS_ERR(nlmsvc_task)) {
 306                 error = PTR_ERR(nlmsvc_task);
 307                 printk(KERN_WARNING
 308                         "lockd_up: kthread_run failed, error=%d\n", error);
 309                 goto out_task;
 310         }
 311         nlmsvc_rqst->rq_task = nlmsvc_task;
 312         wake_up_process(nlmsvc_task);
 313
 314         dprintk("lockd_up: service started\n");
 315         return 0;
 316
 317 out_task:
 318         svc_exit_thread(nlmsvc_rqst);
 319         nlmsvc_task = NULL;
 320 out_rqst:
 321         nlmsvc_rqst = NULL;
 322         return error;
 323 }
 324
 325 static struct svc_serv_ops lockd_sv_ops = {
 326         .svo_shutdown   = svc_rpcb_cleanup,
 327 };
 328
 329 static struct svc_serv *lockd_create_svc(void)
 330 {
 331         struct svc_serv *serv;
 332
 333         /*
 334          * Check whether we're already up and running.
 335          */
 336         if (nlmsvc_rqst) {
 337                 /*
 338                  * Note: increase service usage, because later in case of error
 339                  * svc_destroy() will be called.
 340                  */
 341                 svc_get(nlmsvc_rqst->rq_server);
 342                 return nlmsvc_rqst->rq_server;
 343         }
 344
 345         /*
 346          * Sanity check: if there's no pid,
 347          * we should be the first user ...
 348          */
 349         if (nlmsvc_users)
 350                 printk(KERN_WARNING
 351                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 352
 353         if (!nlm_timeout)
 354                 nlm_timeout = LOCKD_DFLT_TIMEO;
 355         nlmsvc_timeout = nlm_timeout * HZ;
 356
 357         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 358         if (!serv) {
 359                 printk(KERN_WARNING "lockd_up: create service failed\n");
 360                 return ERR_PTR(-ENOMEM);
 361         }
 362         dprintk("lockd_up: service created\n");
 363         return serv;
 364 }
 365
 366 /*
 367  * Bring up the lockd process if it's not already up.
 368  */
 369 int lockd_up(struct net *net)
 370 {
 371         struct svc_serv *serv;
 372         int error;
 373
 374         mutex_lock(&nlmsvc_mutex);
 375
 376         serv = lockd_create_svc();
 377         if (IS_ERR(serv)) {
 378                 error = PTR_ERR(serv);
 379                 goto err_create;
 380         }
 381
 382         error = lockd_up_net(serv, net);
 383         if (error < 0)
 384                 goto err_net;
 385
 386         error = lockd_start_svc(serv);
 387         if (error < 0)
 388                 goto err_start;
 389
 390         nlmsvc_users++;
 391         /*
 392          * Note: svc_serv structures have an initial use count of 1,
 393          * so we exit through here on both success and failure.
 394          */
 395 err_net:
 396         svc_destroy(serv);
 397 err_create:
 398         mutex_unlock(&nlmsvc_mutex);
 399         return error;
 400
 401 err_start:
 402         lockd_down_net(serv, net);
 403         goto err_net;
 404 }
 405 EXPORT_SYMBOL_GPL(lockd_up);
 406
 407 /*
 408  * Decrement the user count and bring down lockd if we're the last.
 409  */
 410 void
 411 lockd_down(struct net *net)
 412 {
 413         mutex_lock(&nlmsvc_mutex);
 414         lockd_down_net(nlmsvc_rqst->rq_server, net);
 415         if (nlmsvc_users) {
 416                 if (--nlmsvc_users)
 417                         goto out;
 418         } else {
 419                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 420                         nlmsvc_task);
 421                 BUG();
 422         }
 423
 424         if (!nlmsvc_task) {
 425                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 426                 BUG();
 427         }
 428         kthread_stop(nlmsvc_task);
 429         dprintk("lockd_down: service stopped\n");
 430         svc_exit_thread(nlmsvc_rqst);
 431         dprintk("lockd_down: service destroyed\n");
 432         nlmsvc_task = NULL;
 433         nlmsvc_rqst = NULL;
 434 out:
 435         mutex_unlock(&nlmsvc_mutex);
 436 }
 437 EXPORT_SYMBOL_GPL(lockd_down);
 438
 439 #ifdef CONFIG_SYSCTL
 440
 441 /*
 442  * Sysctl parameters (same as module parameters, different interface).
 443  */
 444
 445 static struct ctl_table nlm_sysctls[] = {
 446         {
 447                 .procname       = "nlm_grace_period",
 448                 .data           = &nlm_grace_period,
 449                 .maxlen         = sizeof(unsigned long),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_doulongvec_minmax,
 452                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 453                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 454         },
 455         {
 456                 .procname       = "nlm_timeout",
 457                 .data           = &nlm_timeout,
 458                 .maxlen         = sizeof(unsigned long),
 459                 .mode           = 0644,
 460                 .proc_handler   = proc_doulongvec_minmax,
 461                 .extra1         = (unsigned long *) &nlm_timeout_min,
 462                 .extra2         = (unsigned long *) &nlm_timeout_max,
 463         },
 464         {
 465                 .procname       = "nlm_udpport",
 466                 .data           = &nlm_udpport,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = proc_dointvec_minmax,
 470                 .extra1         = (int *) &nlm_port_min,
 471                 .extra2         = (int *) &nlm_port_max,
 472         },
 473         {
 474                 .procname       = "nlm_tcpport",
 475                 .data           = &nlm_tcpport,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = proc_dointvec_minmax,
 479                 .extra1         = (int *) &nlm_port_min,
 480                 .extra2         = (int *) &nlm_port_max,
 481         },
 482         {
 483                 .procname       = "nsm_use_hostnames",
 484                 .data           = &nsm_use_hostnames,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = proc_dointvec,
 488         },
 489         {
 490                 .procname       = "nsm_local_state",
 491                 .data           = &nsm_local_state,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec,
 495         },
 496         { }
 497 };
 498
 499 static struct ctl_table nlm_sysctl_dir[] = {
 500         {
 501                 .procname       = "nfs",
 502                 .mode           = 0555,
 503                 .child          = nlm_sysctls,
 504         },
 505         { }
 506 };
 507
 508 static struct ctl_table nlm_sysctl_root[] = {
 509         {
 510                 .procname       = "fs",
 511                 .mode           = 0555,
 512                 .child          = nlm_sysctl_dir,
 513         },
 514         { }
 515 };
 516
 517 #endif  /* CONFIG_SYSCTL */
 518
 519 /*
 520  * Module (and sysfs) parameters.
 521  */
 522
 523 #define param_set_min_max(name, type, which_strtol, min, max)           \
 524 static int param_set_##name(const char *val, struct kernel_param *kp)   \
 525 {                                                                       \
 526         char *endp;                                                     \
 527         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 528         if (endp == val || *endp || num < (min) || num > (max))         \
 529                 return -EINVAL;                                         \
 530         *((type *) kp->arg) = num;                                      \
 531         return 0;                                                       \
 532 }
 533
 534 static inline int is_callback(u32 proc)
 535 {
 536         return proc == NLMPROC_GRANTED
 537                 || proc == NLMPROC_GRANTED_MSG
 538                 || proc == NLMPROC_TEST_RES
 539                 || proc == NLMPROC_LOCK_RES
 540                 || proc == NLMPROC_CANCEL_RES
 541                 || proc == NLMPROC_UNLOCK_RES
 542                 || proc == NLMPROC_NSM_NOTIFY;
 543 }
 544
 545
 546 static int lockd_authenticate(struct svc_rqst *rqstp)
 547 {
 548         rqstp->rq_client = NULL;
 549         switch (rqstp->rq_authop->flavour) {
 550                 case RPC_AUTH_NULL:
 551                 case RPC_AUTH_UNIX:
 552                         if (rqstp->rq_proc == 0)
 553                                 return SVC_OK;
 554                         if (is_callback(rqstp->rq_proc)) {
 555                                 /* Leave it to individual procedures to
 556                                  * call nlmsvc_lookup_host(rqstp)
 557                                  */
 558                                 return SVC_OK;
 559                         }
 560                         return svc_set_client(rqstp);
 561         }
 562         return SVC_DENIED;
 563 }
 564
 565
 566 param_set_min_max(port, int, simple_strtol, 0, 65535)
 567 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 568                   nlm_grace_period_min, nlm_grace_period_max)
 569 param_set_min_max(timeout, unsigned long, simple_strtoul,
 570                   nlm_timeout_min, nlm_timeout_max)
 571
 572 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 573 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 574 MODULE_LICENSE("GPL");
 575
 576 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 577                   &nlm_grace_period, 0644);
 578 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 579                   &nlm_timeout, 0644);
 580 module_param_call(nlm_udpport, param_set_port, param_get_int,
 581                   &nlm_udpport, 0644);
 582 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 583                   &nlm_tcpport, 0644);
 584 module_param(nsm_use_hostnames, bool, 0644);
 585 module_param(nlm_max_connections, uint, 0644);
 586
 587 static int lockd_init_net(struct net *net)
 588 {
 589         struct lockd_net *ln = net_generic(net, lockd_net_id);
 590
 591         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 592         INIT_LIST_HEAD(&ln->lockd_manager.list);
 593         spin_lock_init(&ln->nsm_clnt_lock);
 594         return 0;
 595 }
 596
 597 static void lockd_exit_net(struct net *net)
 598 {
 599 }
 600
 601 static struct pernet_operations lockd_net_ops = {
 602         .init = lockd_init_net,
 603         .exit = lockd_exit_net,
 604         .id = &lockd_net_id,
 605         .size = sizeof(struct lockd_net),
 606 };
 607
 608
 609 /*
 610  * Initialising and terminating the module.
 611  */
 612
 613 static int __init init_nlm(void)
 614 {
 615         int err;
 616
 617 #ifdef CONFIG_SYSCTL
 618         err = -ENOMEM;
 619         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 620         if (nlm_sysctl_table == NULL)
 621                 goto err_sysctl;
 622 #endif
 623         err = register_pernet_subsys(&lockd_net_ops);
 624         if (err)
 625                 goto err_pernet;
 626
 627         err = lockd_create_procfs();
 628         if (err)
 629                 goto err_procfs;
 630
 631         return 0;
 632
 633 err_procfs:
 634         unregister_pernet_subsys(&lockd_net_ops);
 635 err_pernet:
 636 #ifdef CONFIG_SYSCTL
 637         unregister_sysctl_table(nlm_sysctl_table);
 638 err_sysctl:
 639 #endif
 640         return err;
 641 }
 642
 643 static void __exit exit_nlm(void)
 644 {
 645         /* FIXME: delete all NLM clients */
 646         nlm_shutdown_hosts();
 647         lockd_remove_procfs();
 648         unregister_pernet_subsys(&lockd_net_ops);
 649 #ifdef CONFIG_SYSCTL
 650         unregister_sysctl_table(nlm_sysctl_table);
 651 #endif
 652 }
 653
 654 module_init(init_nlm);
 655 module_exit(exit_nlm);
 656
 657 /*
 658  * Define NLM program and procedures
 659  */
 660 static struct svc_version       nlmsvc_version1 = {
 661                 .vs_vers        = 1,
 662                 .vs_nproc       = 17,
 663                 .vs_proc        = nlmsvc_procedures,
 664                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 665 };
 666 static struct svc_version       nlmsvc_version3 = {
 667                 .vs_vers        = 3,
 668                 .vs_nproc       = 24,
 669                 .vs_proc        = nlmsvc_procedures,
 670                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 671 };
 672 #ifdef CONFIG_LOCKD_V4
 673 static struct svc_version       nlmsvc_version4 = {
 674                 .vs_vers        = 4,
 675                 .vs_nproc       = 24,
 676                 .vs_proc        = nlmsvc_procedures4,
 677                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 678 };
 679 #endif
 680 static struct svc_version *     nlmsvc_version[] = {
 681         [1] = &nlmsvc_version1,
 682         [3] = &nlmsvc_version3,
 683 #ifdef CONFIG_LOCKD_V4
 684         [4] = &nlmsvc_version4,
 685 #endif
 686 };
 687
 688 static struct svc_stat          nlmsvc_stats;
 689
 690 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 691 static struct svc_program       nlmsvc_program = {
 692         .pg_prog                = NLM_PROGRAM,          /* program number */
 693         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 694         .pg_vers                = nlmsvc_version,       /* version table */
 695         .pg_name                = "lockd",              /* service name */
 696         .pg_class               = "nfsd",               /* share authentication with nfsd */
 697         .pg_stats               = &nlmsvc_stats,        /* stats table */
 698         .pg_authenticate = &lockd_authenticate  /* export authentication */
 699 };