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