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