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 *lockd_create_svc(void)
 326 {
 327         struct svc_serv *serv;
 328
 329         /*
 330          * Check whether we're already up and running.
 331          */
 332         if (nlmsvc_rqst) {
 333                 /*
 334                  * Note: increase service usage, because later in case of error
 335                  * svc_destroy() will be called.
 336                  */
 337                 svc_get(nlmsvc_rqst->rq_server);
 338                 return nlmsvc_rqst->rq_server;
 339         }
 340
 341         /*
 342          * Sanity check: if there's no pid,
 343          * we should be the first user ...
 344          */
 345         if (nlmsvc_users)
 346                 printk(KERN_WARNING
 347                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 348
 349         if (!nlm_timeout)
 350                 nlm_timeout = LOCKD_DFLT_TIMEO;
 351         nlmsvc_timeout = nlm_timeout * HZ;
 352
 353         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, svc_rpcb_cleanup);
 354         if (!serv) {
 355                 printk(KERN_WARNING "lockd_up: create service failed\n");
 356                 return ERR_PTR(-ENOMEM);
 357         }
 358         dprintk("lockd_up: service created\n");
 359         return serv;
 360 }
 361
 362 /*
 363  * Bring up the lockd process if it's not already up.
 364  */
 365 int lockd_up(struct net *net)
 366 {
 367         struct svc_serv *serv;
 368         int error;
 369
 370         mutex_lock(&nlmsvc_mutex);
 371
 372         serv = lockd_create_svc();
 373         if (IS_ERR(serv)) {
 374                 error = PTR_ERR(serv);
 375                 goto err_create;
 376         }
 377
 378         error = lockd_up_net(serv, net);
 379         if (error < 0)
 380                 goto err_net;
 381
 382         error = lockd_start_svc(serv);
 383         if (error < 0)
 384                 goto err_start;
 385
 386         nlmsvc_users++;
 387         /*
 388          * Note: svc_serv structures have an initial use count of 1,
 389          * so we exit through here on both success and failure.
 390          */
 391 err_net:
 392         svc_destroy(serv);
 393 err_create:
 394         mutex_unlock(&nlmsvc_mutex);
 395         return error;
 396
 397 err_start:
 398         lockd_down_net(serv, net);
 399         goto err_net;
 400 }
 401 EXPORT_SYMBOL_GPL(lockd_up);
 402
 403 /*
 404  * Decrement the user count and bring down lockd if we're the last.
 405  */
 406 void
 407 lockd_down(struct net *net)
 408 {
 409         mutex_lock(&nlmsvc_mutex);
 410         lockd_down_net(nlmsvc_rqst->rq_server, net);
 411         if (nlmsvc_users) {
 412                 if (--nlmsvc_users)
 413                         goto out;
 414         } else {
 415                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 416                         nlmsvc_task);
 417                 BUG();
 418         }
 419
 420         if (!nlmsvc_task) {
 421                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 422                 BUG();
 423         }
 424         kthread_stop(nlmsvc_task);
 425         dprintk("lockd_down: service stopped\n");
 426         svc_exit_thread(nlmsvc_rqst);
 427         dprintk("lockd_down: service destroyed\n");
 428         nlmsvc_task = NULL;
 429         nlmsvc_rqst = NULL;
 430 out:
 431         mutex_unlock(&nlmsvc_mutex);
 432 }
 433 EXPORT_SYMBOL_GPL(lockd_down);
 434
 435 #ifdef CONFIG_SYSCTL
 436
 437 /*
 438  * Sysctl parameters (same as module parameters, different interface).
 439  */
 440
 441 static struct ctl_table nlm_sysctls[] = {
 442         {
 443                 .procname       = "nlm_grace_period",
 444                 .data           = &nlm_grace_period,
 445                 .maxlen         = sizeof(unsigned long),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_doulongvec_minmax,
 448                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 449                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 450         },
 451         {
 452                 .procname       = "nlm_timeout",
 453                 .data           = &nlm_timeout,
 454                 .maxlen         = sizeof(unsigned long),
 455                 .mode           = 0644,
 456                 .proc_handler   = proc_doulongvec_minmax,
 457                 .extra1         = (unsigned long *) &nlm_timeout_min,
 458                 .extra2         = (unsigned long *) &nlm_timeout_max,
 459         },
 460         {
 461                 .procname       = "nlm_udpport",
 462                 .data           = &nlm_udpport,
 463                 .maxlen         = sizeof(int),
 464                 .mode           = 0644,
 465                 .proc_handler   = proc_dointvec_minmax,
 466                 .extra1         = (int *) &nlm_port_min,
 467                 .extra2         = (int *) &nlm_port_max,
 468         },
 469         {
 470                 .procname       = "nlm_tcpport",
 471                 .data           = &nlm_tcpport,
 472                 .maxlen         = sizeof(int),
 473                 .mode           = 0644,
 474                 .proc_handler   = proc_dointvec_minmax,
 475                 .extra1         = (int *) &nlm_port_min,
 476                 .extra2         = (int *) &nlm_port_max,
 477         },
 478         {
 479                 .procname       = "nsm_use_hostnames",
 480                 .data           = &nsm_use_hostnames,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec,
 484         },
 485         {
 486                 .procname       = "nsm_local_state",
 487                 .data           = &nsm_local_state,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492         { }
 493 };
 494
 495 static struct ctl_table nlm_sysctl_dir[] = {
 496         {
 497                 .procname       = "nfs",
 498                 .mode           = 0555,
 499                 .child          = nlm_sysctls,
 500         },
 501         { }
 502 };
 503
 504 static struct ctl_table nlm_sysctl_root[] = {
 505         {
 506                 .procname       = "fs",
 507                 .mode           = 0555,
 508                 .child          = nlm_sysctl_dir,
 509         },
 510         { }
 511 };
 512
 513 #endif  /* CONFIG_SYSCTL */
 514
 515 /*
 516  * Module (and sysfs) parameters.
 517  */
 518
 519 #define param_set_min_max(name, type, which_strtol, min, max)           \
 520 static int param_set_##name(const char *val, struct kernel_param *kp)   \
 521 {                                                                       \
 522         char *endp;                                                     \
 523         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 524         if (endp == val || *endp || num < (min) || num > (max))         \
 525                 return -EINVAL;                                         \
 526         *((type *) kp->arg) = num;                                      \
 527         return 0;                                                       \
 528 }
 529
 530 static inline int is_callback(u32 proc)
 531 {
 532         return proc == NLMPROC_GRANTED
 533                 || proc == NLMPROC_GRANTED_MSG
 534                 || proc == NLMPROC_TEST_RES
 535                 || proc == NLMPROC_LOCK_RES
 536                 || proc == NLMPROC_CANCEL_RES
 537                 || proc == NLMPROC_UNLOCK_RES
 538                 || proc == NLMPROC_NSM_NOTIFY;
 539 }
 540
 541
 542 static int lockd_authenticate(struct svc_rqst *rqstp)
 543 {
 544         rqstp->rq_client = NULL;
 545         switch (rqstp->rq_authop->flavour) {
 546                 case RPC_AUTH_NULL:
 547                 case RPC_AUTH_UNIX:
 548                         if (rqstp->rq_proc == 0)
 549                                 return SVC_OK;
 550                         if (is_callback(rqstp->rq_proc)) {
 551                                 /* Leave it to individual procedures to
 552                                  * call nlmsvc_lookup_host(rqstp)
 553                                  */
 554                                 return SVC_OK;
 555                         }
 556                         return svc_set_client(rqstp);
 557         }
 558         return SVC_DENIED;
 559 }
 560
 561
 562 param_set_min_max(port, int, simple_strtol, 0, 65535)
 563 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 564                   nlm_grace_period_min, nlm_grace_period_max)
 565 param_set_min_max(timeout, unsigned long, simple_strtoul,
 566                   nlm_timeout_min, nlm_timeout_max)
 567
 568 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 569 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 570 MODULE_LICENSE("GPL");
 571
 572 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 573                   &nlm_grace_period, 0644);
 574 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 575                   &nlm_timeout, 0644);
 576 module_param_call(nlm_udpport, param_set_port, param_get_int,
 577                   &nlm_udpport, 0644);
 578 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 579                   &nlm_tcpport, 0644);
 580 module_param(nsm_use_hostnames, bool, 0644);
 581 module_param(nlm_max_connections, uint, 0644);
 582
 583 static int lockd_init_net(struct net *net)
 584 {
 585         struct lockd_net *ln = net_generic(net, lockd_net_id);
 586
 587         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 588         INIT_LIST_HEAD(&ln->lockd_manager.list);
 589         spin_lock_init(&ln->nsm_clnt_lock);
 590         return 0;
 591 }
 592
 593 static void lockd_exit_net(struct net *net)
 594 {
 595 }
 596
 597 static struct pernet_operations lockd_net_ops = {
 598         .init = lockd_init_net,
 599         .exit = lockd_exit_net,
 600         .id = &lockd_net_id,
 601         .size = sizeof(struct lockd_net),
 602 };
 603
 604
 605 /*
 606  * Initialising and terminating the module.
 607  */
 608
 609 static int __init init_nlm(void)
 610 {
 611         int err;
 612
 613 #ifdef CONFIG_SYSCTL
 614         err = -ENOMEM;
 615         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 616         if (nlm_sysctl_table == NULL)
 617                 goto err_sysctl;
 618 #endif
 619         err = register_pernet_subsys(&lockd_net_ops);
 620         if (err)
 621                 goto err_pernet;
 622
 623         err = lockd_create_procfs();
 624         if (err)
 625                 goto err_procfs;
 626
 627         return 0;
 628
 629 err_procfs:
 630         unregister_pernet_subsys(&lockd_net_ops);
 631 err_pernet:
 632 #ifdef CONFIG_SYSCTL
 633         unregister_sysctl_table(nlm_sysctl_table);
 634 err_sysctl:
 635 #endif
 636         return err;
 637 }
 638
 639 static void __exit exit_nlm(void)
 640 {
 641         /* FIXME: delete all NLM clients */
 642         nlm_shutdown_hosts();
 643         lockd_remove_procfs();
 644         unregister_pernet_subsys(&lockd_net_ops);
 645 #ifdef CONFIG_SYSCTL
 646         unregister_sysctl_table(nlm_sysctl_table);
 647 #endif
 648 }
 649
 650 module_init(init_nlm);
 651 module_exit(exit_nlm);
 652
 653 /*
 654  * Define NLM program and procedures
 655  */
 656 static struct svc_version       nlmsvc_version1 = {
 657                 .vs_vers        = 1,
 658                 .vs_nproc       = 17,
 659                 .vs_proc        = nlmsvc_procedures,
 660                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 661 };
 662 static struct svc_version       nlmsvc_version3 = {
 663                 .vs_vers        = 3,
 664                 .vs_nproc       = 24,
 665                 .vs_proc        = nlmsvc_procedures,
 666                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 667 };
 668 #ifdef CONFIG_LOCKD_V4
 669 static struct svc_version       nlmsvc_version4 = {
 670                 .vs_vers        = 4,
 671                 .vs_nproc       = 24,
 672                 .vs_proc        = nlmsvc_procedures4,
 673                 .vs_xdrsize     = NLMSVC_XDRSIZE,
 674 };
 675 #endif
 676 static struct svc_version *     nlmsvc_version[] = {
 677         [1] = &nlmsvc_version1,
 678         [3] = &nlmsvc_version3,
 679 #ifdef CONFIG_LOCKD_V4
 680         [4] = &nlmsvc_version4,
 681 #endif
 682 };
 683
 684 static struct svc_stat          nlmsvc_stats;
 685
 686 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 687 static struct svc_program       nlmsvc_program = {
 688         .pg_prog                = NLM_PROGRAM,          /* program number */
 689         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 690         .pg_vers                = nlmsvc_version,       /* version table */
 691         .pg_name                = "lockd",              /* service name */
 692         .pg_class               = "nfsd",               /* share authentication with nfsd */
 693         .pg_stats               = &nlmsvc_stats,        /* stats table */
 694         .pg_authenticate = &lockd_authenticate  /* export authentication */
 695 };