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/signal.h>
  21 #include <linux/errno.h>
  22 #include <linux/in.h>
  23 #include <linux/uio.h>
  24 #include <linux/smp.h>
  25 #include <linux/mutex.h>
  26 #include <linux/kthread.h>
  27 #include <linux/freezer.h>
  28 #include <linux/inetdevice.h>
  29
  30 #include <linux/sunrpc/types.h>
  31 #include <linux/sunrpc/stats.h>
  32 #include <linux/sunrpc/clnt.h>
  33 #include <linux/sunrpc/svc.h>
  34 #include <linux/sunrpc/svcsock.h>
  35 #include <linux/sunrpc/svc_xprt.h>
  36 #include <net/ip.h>
  37 #include <net/addrconf.h>
  38 #include <net/ipv6.h>
  39 #include <linux/lockd/lockd.h>
  40 #include <linux/nfs.h>
  41
  42 #include "netns.h"
  43 #include "procfs.h"
  44
  45 #define NLMDBG_FACILITY         NLMDBG_SVC
  46 #define LOCKD_BUFSIZE           (1024 + NLMSVC_XDRSIZE)
  47 #define ALLOWED_SIGS            (sigmask(SIGKILL))
  48
  49 static struct svc_program       nlmsvc_program;
  50
  51 const struct nlmsvc_binding     *nlmsvc_ops;
  52 EXPORT_SYMBOL_GPL(nlmsvc_ops);
  53
  54 static DEFINE_MUTEX(nlmsvc_mutex);
  55 static unsigned int             nlmsvc_users;
  56 static struct task_struct       *nlmsvc_task;
  57 static struct svc_rqst          *nlmsvc_rqst;
  58 unsigned long                   nlmsvc_timeout;
  59
  60 atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
  61 DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
  62
  63 unsigned int lockd_net_id;
  64
  65 /*
  66  * These can be set at insmod time (useful for NFS as root filesystem),
  67  * and also changed through the sysctl interface.  -- Jamie Lokier, Aug 2003
  68  */
  69 static unsigned long            nlm_grace_period;
  70 static unsigned long            nlm_timeout = LOCKD_DFLT_TIMEO;
  71 static int                      nlm_udpport, nlm_tcpport;
  72
  73 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */
  74 static unsigned int             nlm_max_connections = 1024;
  75
  76 /*
  77  * Constants needed for the sysctl interface.
  78  */
  79 static const unsigned long      nlm_grace_period_min = 0;
  80 static const unsigned long      nlm_grace_period_max = 240;
  81 static const unsigned long      nlm_timeout_min = 3;
  82 static const unsigned long      nlm_timeout_max = 20;
  83 static const int                nlm_port_min = 0, nlm_port_max = 65535;
  84
  85 #ifdef CONFIG_SYSCTL
  86 static struct ctl_table_header * nlm_sysctl_table;
  87 #endif
  88
  89 static unsigned long get_lockd_grace_period(void)
  90 {
  91         /* Note: nlm_timeout should always be nonzero */
  92         if (nlm_grace_period)
  93                 return roundup(nlm_grace_period, nlm_timeout) * HZ;
  94         else
  95                 return nlm_timeout * 5 * HZ;
  96 }
  97
  98 static void grace_ender(struct work_struct *grace)
  99 {
 100         struct delayed_work *dwork = to_delayed_work(grace);
 101         struct lockd_net *ln = container_of(dwork, struct lockd_net,
 102                                             grace_period_end);
 103
 104         locks_end_grace(&ln->lockd_manager);
 105 }
 106
 107 static void set_grace_period(struct net *net)
 108 {
 109         unsigned long grace_period = get_lockd_grace_period();
 110         struct lockd_net *ln = net_generic(net, lockd_net_id);
 111
 112         locks_start_grace(net, &ln->lockd_manager);
 113         cancel_delayed_work_sync(&ln->grace_period_end);
 114         schedule_delayed_work(&ln->grace_period_end, grace_period);
 115 }
 116
 117 static void restart_grace(void)
 118 {
 119         if (nlmsvc_ops) {
 120                 struct net *net = &init_net;
 121                 struct lockd_net *ln = net_generic(net, lockd_net_id);
 122
 123                 cancel_delayed_work_sync(&ln->grace_period_end);
 124                 locks_end_grace(&ln->lockd_manager);
 125                 nlmsvc_invalidate_all();
 126                 set_grace_period(net);
 127         }
 128 }
 129
 130 /*
 131  * This is the lockd kernel thread
 132  */
 133 static int
 134 lockd(void *vrqstp)
 135 {
 136         int             err = 0;
 137         struct svc_rqst *rqstp = vrqstp;
 138         struct net *net = &init_net;
 139         struct lockd_net *ln = net_generic(net, lockd_net_id);
 140
 141         /* try_to_freeze() is called from svc_recv() */
 142         set_freezable();
 143
 144         /* Allow SIGKILL to tell lockd to drop all of its locks */
 145         allow_signal(SIGKILL);
 146
 147         dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
 148
 149         /*
 150          * The main request loop. We don't terminate until the last
 151          * NFS mount or NFS daemon has gone away.
 152          */
 153         while (!kthread_should_stop()) {
 154                 long timeout = MAX_SCHEDULE_TIMEOUT;
 155                 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
 156
 157                 /* update sv_maxconn if it has changed */
 158                 rqstp->rq_server->sv_maxconn = nlm_max_connections;
 159
 160                 if (signalled()) {
 161                         flush_signals(current);
 162                         restart_grace();
 163                         continue;
 164                 }
 165
 166                 timeout = nlmsvc_retry_blocked();
 167
 168                 /*
 169                  * Find a socket with data available and call its
 170                  * recvfrom routine.
 171                  */
 172                 err = svc_recv(rqstp, timeout);
 173                 if (err == -EAGAIN || err == -EINTR)
 174                         continue;
 175                 dprintk("lockd: request from %s\n",
 176                                 svc_print_addr(rqstp, buf, sizeof(buf)));
 177
 178                 svc_process(rqstp);
 179         }
 180         flush_signals(current);
 181         if (nlmsvc_ops)
 182                 nlmsvc_invalidate_all();
 183         nlm_shutdown_hosts();
 184         cancel_delayed_work_sync(&ln->grace_period_end);
 185         locks_end_grace(&ln->lockd_manager);
 186         return 0;
 187 }
 188
 189 static int create_lockd_listener(struct svc_serv *serv, const char *name,
 190                                  struct net *net, const int family,
 191                                  const unsigned short port)
 192 {
 193         struct svc_xprt *xprt;
 194
 195         xprt = svc_find_xprt(serv, name, net, family, 0);
 196         if (xprt == NULL)
 197                 return svc_create_xprt(serv, name, net, family, port,
 198                                                 SVC_SOCK_DEFAULTS);
 199         svc_xprt_put(xprt);
 200         return 0;
 201 }
 202
 203 static int create_lockd_family(struct svc_serv *serv, struct net *net,
 204                                const int family)
 205 {
 206         int err;
 207
 208         err = create_lockd_listener(serv, "udp", net, family, nlm_udpport);
 209         if (err < 0)
 210                 return err;
 211
 212         return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport);
 213 }
 214
 215 /*
 216  * Ensure there are active UDP and TCP listeners for lockd.
 217  *
 218  * Even if we have only TCP NFS mounts and/or TCP NFSDs, some
 219  * local services (such as rpc.statd) still require UDP, and
 220  * some NFS servers do not yet support NLM over TCP.
 221  *
 222  * Returns zero if all listeners are available; otherwise a
 223  * negative errno value is returned.
 224  */
 225 static int make_socks(struct svc_serv *serv, struct net *net)
 226 {
 227         static int warned;
 228         int err;
 229
 230         err = create_lockd_family(serv, net, PF_INET);
 231         if (err < 0)
 232                 goto out_err;
 233
 234         err = create_lockd_family(serv, net, PF_INET6);
 235         if (err < 0 && err != -EAFNOSUPPORT)
 236                 goto out_err;
 237
 238         warned = 0;
 239         return 0;
 240
 241 out_err:
 242         if (warned++ == 0)
 243                 printk(KERN_WARNING
 244                         "lockd_up: makesock failed, error=%d\n", err);
 245         svc_shutdown_net(serv, net);
 246         return err;
 247 }
 248
 249 static int lockd_up_net(struct svc_serv *serv, struct net *net)
 250 {
 251         struct lockd_net *ln = net_generic(net, lockd_net_id);
 252         int error;
 253
 254         if (ln->nlmsvc_users++)
 255                 return 0;
 256
 257         error = svc_bind(serv, net);
 258         if (error)
 259                 goto err_bind;
 260
 261         error = make_socks(serv, net);
 262         if (error < 0)
 263                 goto err_bind;
 264         set_grace_period(net);
 265         dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum);
 266         return 0;
 267
 268 err_bind:
 269         ln->nlmsvc_users--;
 270         return error;
 271 }
 272
 273 static void lockd_down_net(struct svc_serv *serv, struct net *net)
 274 {
 275         struct lockd_net *ln = net_generic(net, lockd_net_id);
 276
 277         if (ln->nlmsvc_users) {
 278                 if (--ln->nlmsvc_users == 0) {
 279                         nlm_shutdown_hosts_net(net);
 280                         cancel_delayed_work_sync(&ln->grace_period_end);
 281                         locks_end_grace(&ln->lockd_manager);
 282                         svc_shutdown_net(serv, net);
 283                         dprintk("%s: per-net data destroyed; net=%x\n",
 284                                 __func__, net->ns.inum);
 285                 }
 286         } else {
 287                 pr_err("%s: no users! task=%p, net=%x\n",
 288                         __func__, nlmsvc_task, net->ns.inum);
 289                 BUG();
 290         }
 291 }
 292
 293 static int lockd_inetaddr_event(struct notifier_block *this,
 294         unsigned long event, void *ptr)
 295 {
 296         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 297         struct sockaddr_in sin;
 298
 299         if ((event != NETDEV_DOWN) ||
 300             !atomic_inc_not_zero(&nlm_ntf_refcnt))
 301                 goto out;
 302
 303         if (nlmsvc_rqst) {
 304                 dprintk("lockd_inetaddr_event: removed %pI4\n",
 305                         &ifa->ifa_local);
 306                 sin.sin_family = AF_INET;
 307                 sin.sin_addr.s_addr = ifa->ifa_local;
 308                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 309                         (struct sockaddr *)&sin);
 310         }
 311         atomic_dec(&nlm_ntf_refcnt);
 312         wake_up(&nlm_ntf_wq);
 313
 314 out:
 315         return NOTIFY_DONE;
 316 }
 317
 318 static struct notifier_block lockd_inetaddr_notifier = {
 319         .notifier_call = lockd_inetaddr_event,
 320 };
 321
 322 #if IS_ENABLED(CONFIG_IPV6)
 323 static int lockd_inet6addr_event(struct notifier_block *this,
 324         unsigned long event, void *ptr)
 325 {
 326         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 327         struct sockaddr_in6 sin6;
 328
 329         if ((event != NETDEV_DOWN) ||
 330             !atomic_inc_not_zero(&nlm_ntf_refcnt))
 331                 goto out;
 332
 333         if (nlmsvc_rqst) {
 334                 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr);
 335                 sin6.sin6_family = AF_INET6;
 336                 sin6.sin6_addr = ifa->addr;
 337                 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 338                         sin6.sin6_scope_id = ifa->idev->dev->ifindex;
 339                 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
 340                         (struct sockaddr *)&sin6);
 341         }
 342         atomic_dec(&nlm_ntf_refcnt);
 343         wake_up(&nlm_ntf_wq);
 344
 345 out:
 346         return NOTIFY_DONE;
 347 }
 348
 349 static struct notifier_block lockd_inet6addr_notifier = {
 350         .notifier_call = lockd_inet6addr_event,
 351 };
 352 #endif
 353
 354 static void lockd_unregister_notifiers(void)
 355 {
 356         unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
 357 #if IS_ENABLED(CONFIG_IPV6)
 358         unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
 359 #endif
 360         wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
 361 }
 362
 363 static void lockd_svc_exit_thread(void)
 364 {
 365         atomic_dec(&nlm_ntf_refcnt);
 366         lockd_unregister_notifiers();
 367         svc_exit_thread(nlmsvc_rqst);
 368 }
 369
 370 static int lockd_start_svc(struct svc_serv *serv)
 371 {
 372         int error;
 373
 374         if (nlmsvc_rqst)
 375                 return 0;
 376
 377         /*
 378          * Create the kernel thread and wait for it to start.
 379          */
 380         nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE);
 381         if (IS_ERR(nlmsvc_rqst)) {
 382                 error = PTR_ERR(nlmsvc_rqst);
 383                 printk(KERN_WARNING
 384                         "lockd_up: svc_rqst allocation failed, error=%d\n",
 385                         error);
 386                 lockd_unregister_notifiers();
 387                 goto out_rqst;
 388         }
 389
 390         atomic_inc(&nlm_ntf_refcnt);
 391         svc_sock_update_bufs(serv);
 392         serv->sv_maxconn = nlm_max_connections;
 393
 394         nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name);
 395         if (IS_ERR(nlmsvc_task)) {
 396                 error = PTR_ERR(nlmsvc_task);
 397                 printk(KERN_WARNING
 398                         "lockd_up: kthread_run failed, error=%d\n", error);
 399                 goto out_task;
 400         }
 401         nlmsvc_rqst->rq_task = nlmsvc_task;
 402         wake_up_process(nlmsvc_task);
 403
 404         dprintk("lockd_up: service started\n");
 405         return 0;
 406
 407 out_task:
 408         lockd_svc_exit_thread();
 409         nlmsvc_task = NULL;
 410 out_rqst:
 411         nlmsvc_rqst = NULL;
 412         return error;
 413 }
 414
 415 static const struct svc_serv_ops lockd_sv_ops = {
 416         .svo_shutdown           = svc_rpcb_cleanup,
 417         .svo_enqueue_xprt       = svc_xprt_do_enqueue,
 418 };
 419
 420 static struct svc_serv *lockd_create_svc(void)
 421 {
 422         struct svc_serv *serv;
 423
 424         /*
 425          * Check whether we're already up and running.
 426          */
 427         if (nlmsvc_rqst) {
 428                 /*
 429                  * Note: increase service usage, because later in case of error
 430                  * svc_destroy() will be called.
 431                  */
 432                 svc_get(nlmsvc_rqst->rq_server);
 433                 return nlmsvc_rqst->rq_server;
 434         }
 435
 436         /*
 437          * Sanity check: if there's no pid,
 438          * we should be the first user ...
 439          */
 440         if (nlmsvc_users)
 441                 printk(KERN_WARNING
 442                         "lockd_up: no pid, %d users??\n", nlmsvc_users);
 443
 444         if (!nlm_timeout)
 445                 nlm_timeout = LOCKD_DFLT_TIMEO;
 446         nlmsvc_timeout = nlm_timeout * HZ;
 447
 448         serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops);
 449         if (!serv) {
 450                 printk(KERN_WARNING "lockd_up: create service failed\n");
 451                 return ERR_PTR(-ENOMEM);
 452         }
 453         register_inetaddr_notifier(&lockd_inetaddr_notifier);
 454 #if IS_ENABLED(CONFIG_IPV6)
 455         register_inet6addr_notifier(&lockd_inet6addr_notifier);
 456 #endif
 457         dprintk("lockd_up: service created\n");
 458         return serv;
 459 }
 460
 461 /*
 462  * Bring up the lockd process if it's not already up.
 463  */
 464 int lockd_up(struct net *net)
 465 {
 466         struct svc_serv *serv;
 467         int error;
 468
 469         mutex_lock(&nlmsvc_mutex);
 470
 471         serv = lockd_create_svc();
 472         if (IS_ERR(serv)) {
 473                 error = PTR_ERR(serv);
 474                 goto err_create;
 475         }
 476
 477         error = lockd_up_net(serv, net);
 478         if (error < 0) {
 479                 lockd_unregister_notifiers();
 480                 goto err_put;
 481         }
 482
 483         error = lockd_start_svc(serv);
 484         if (error < 0) {
 485                 lockd_down_net(serv, net);
 486                 goto err_put;
 487         }
 488         nlmsvc_users++;
 489         /*
 490          * Note: svc_serv structures have an initial use count of 1,
 491          * so we exit through here on both success and failure.
 492          */
 493 err_put:
 494         svc_destroy(serv);
 495 err_create:
 496         mutex_unlock(&nlmsvc_mutex);
 497         return error;
 498 }
 499 EXPORT_SYMBOL_GPL(lockd_up);
 500
 501 /*
 502  * Decrement the user count and bring down lockd if we're the last.
 503  */
 504 void
 505 lockd_down(struct net *net)
 506 {
 507         mutex_lock(&nlmsvc_mutex);
 508         lockd_down_net(nlmsvc_rqst->rq_server, net);
 509         if (nlmsvc_users) {
 510                 if (--nlmsvc_users)
 511                         goto out;
 512         } else {
 513                 printk(KERN_ERR "lockd_down: no users! task=%p\n",
 514                         nlmsvc_task);
 515                 BUG();
 516         }
 517
 518         if (!nlmsvc_task) {
 519                 printk(KERN_ERR "lockd_down: no lockd running.\n");
 520                 BUG();
 521         }
 522         kthread_stop(nlmsvc_task);
 523         dprintk("lockd_down: service stopped\n");
 524         lockd_svc_exit_thread();
 525         dprintk("lockd_down: service destroyed\n");
 526         nlmsvc_task = NULL;
 527         nlmsvc_rqst = NULL;
 528 out:
 529         mutex_unlock(&nlmsvc_mutex);
 530 }
 531 EXPORT_SYMBOL_GPL(lockd_down);
 532
 533 #ifdef CONFIG_SYSCTL
 534
 535 /*
 536  * Sysctl parameters (same as module parameters, different interface).
 537  */
 538
 539 static struct ctl_table nlm_sysctls[] = {
 540         {
 541                 .procname       = "nlm_grace_period",
 542                 .data           = &nlm_grace_period,
 543                 .maxlen         = sizeof(unsigned long),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_doulongvec_minmax,
 546                 .extra1         = (unsigned long *) &nlm_grace_period_min,
 547                 .extra2         = (unsigned long *) &nlm_grace_period_max,
 548         },
 549         {
 550                 .procname       = "nlm_timeout",
 551                 .data           = &nlm_timeout,
 552                 .maxlen         = sizeof(unsigned long),
 553                 .mode           = 0644,
 554                 .proc_handler   = proc_doulongvec_minmax,
 555                 .extra1         = (unsigned long *) &nlm_timeout_min,
 556                 .extra2         = (unsigned long *) &nlm_timeout_max,
 557         },
 558         {
 559                 .procname       = "nlm_udpport",
 560                 .data           = &nlm_udpport,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dointvec_minmax,
 564                 .extra1         = (int *) &nlm_port_min,
 565                 .extra2         = (int *) &nlm_port_max,
 566         },
 567         {
 568                 .procname       = "nlm_tcpport",
 569                 .data           = &nlm_tcpport,
 570                 .maxlen         = sizeof(int),
 571                 .mode           = 0644,
 572                 .proc_handler   = proc_dointvec_minmax,
 573                 .extra1         = (int *) &nlm_port_min,
 574                 .extra2         = (int *) &nlm_port_max,
 575         },
 576         {
 577                 .procname       = "nsm_use_hostnames",
 578                 .data           = &nsm_use_hostnames,
 579                 .maxlen         = sizeof(int),
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_dointvec,
 582         },
 583         {
 584                 .procname       = "nsm_local_state",
 585                 .data           = &nsm_local_state,
 586                 .maxlen         = sizeof(int),
 587                 .mode           = 0644,
 588                 .proc_handler   = proc_dointvec,
 589         },
 590         { }
 591 };
 592
 593 static struct ctl_table nlm_sysctl_dir[] = {
 594         {
 595                 .procname       = "nfs",
 596                 .mode           = 0555,
 597                 .child          = nlm_sysctls,
 598         },
 599         { }
 600 };
 601
 602 static struct ctl_table nlm_sysctl_root[] = {
 603         {
 604                 .procname       = "fs",
 605                 .mode           = 0555,
 606                 .child          = nlm_sysctl_dir,
 607         },
 608         { }
 609 };
 610
 611 #endif  /* CONFIG_SYSCTL */
 612
 613 /*
 614  * Module (and sysfs) parameters.
 615  */
 616
 617 #define param_set_min_max(name, type, which_strtol, min, max)           \
 618 static int param_set_##name(const char *val, const struct kernel_param *kp) \
 619 {                                                                       \
 620         char *endp;                                                     \
 621         __typeof__(type) num = which_strtol(val, &endp, 0);             \
 622         if (endp == val || *endp || num < (min) || num > (max))         \
 623                 return -EINVAL;                                         \
 624         *((type *) kp->arg) = num;                                      \
 625         return 0;                                                       \
 626 }
 627
 628 static inline int is_callback(u32 proc)
 629 {
 630         return proc == NLMPROC_GRANTED
 631                 || proc == NLMPROC_GRANTED_MSG
 632                 || proc == NLMPROC_TEST_RES
 633                 || proc == NLMPROC_LOCK_RES
 634                 || proc == NLMPROC_CANCEL_RES
 635                 || proc == NLMPROC_UNLOCK_RES
 636                 || proc == NLMPROC_NSM_NOTIFY;
 637 }
 638
 639
 640 static int lockd_authenticate(struct svc_rqst *rqstp)
 641 {
 642         rqstp->rq_client = NULL;
 643         switch (rqstp->rq_authop->flavour) {
 644                 case RPC_AUTH_NULL:
 645                 case RPC_AUTH_UNIX:
 646                         if (rqstp->rq_proc == 0)
 647                                 return SVC_OK;
 648                         if (is_callback(rqstp->rq_proc)) {
 649                                 /* Leave it to individual procedures to
 650                                  * call nlmsvc_lookup_host(rqstp)
 651                                  */
 652                                 return SVC_OK;
 653                         }
 654                         return svc_set_client(rqstp);
 655         }
 656         return SVC_DENIED;
 657 }
 658
 659
 660 param_set_min_max(port, int, simple_strtol, 0, 65535)
 661 param_set_min_max(grace_period, unsigned long, simple_strtoul,
 662                   nlm_grace_period_min, nlm_grace_period_max)
 663 param_set_min_max(timeout, unsigned long, simple_strtoul,
 664                   nlm_timeout_min, nlm_timeout_max)
 665
 666 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 667 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION ".");
 668 MODULE_LICENSE("GPL");
 669
 670 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong,
 671                   &nlm_grace_period, 0644);
 672 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong,
 673                   &nlm_timeout, 0644);
 674 module_param_call(nlm_udpport, param_set_port, param_get_int,
 675                   &nlm_udpport, 0644);
 676 module_param_call(nlm_tcpport, param_set_port, param_get_int,
 677                   &nlm_tcpport, 0644);
 678 module_param(nsm_use_hostnames, bool, 0644);
 679 module_param(nlm_max_connections, uint, 0644);
 680
 681 static int lockd_init_net(struct net *net)
 682 {
 683         struct lockd_net *ln = net_generic(net, lockd_net_id);
 684
 685         INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
 686         INIT_LIST_HEAD(&ln->lockd_manager.list);
 687         ln->lockd_manager.block_opens = false;
 688         INIT_LIST_HEAD(&ln->nsm_handles);
 689         return 0;
 690 }
 691
 692 static void lockd_exit_net(struct net *net)
 693 {
 694         struct lockd_net *ln = net_generic(net, lockd_net_id);
 695
 696         WARN_ONCE(!list_empty(&ln->lockd_manager.list),
 697                   "net %x %s: lockd_manager.list is not empty\n",
 698                   net->ns.inum, __func__);
 699         WARN_ONCE(!list_empty(&ln->nsm_handles),
 700                   "net %x %s: nsm_handles list is not empty\n",
 701                   net->ns.inum, __func__);
 702         WARN_ONCE(delayed_work_pending(&ln->grace_period_end),
 703                   "net %x %s: grace_period_end was not cancelled\n",
 704                   net->ns.inum, __func__);
 705 }
 706
 707 static struct pernet_operations lockd_net_ops = {
 708         .init = lockd_init_net,
 709         .exit = lockd_exit_net,
 710         .id = &lockd_net_id,
 711         .size = sizeof(struct lockd_net),
 712 };
 713
 714
 715 /*
 716  * Initialising and terminating the module.
 717  */
 718
 719 static int __init init_nlm(void)
 720 {
 721         int err;
 722
 723 #ifdef CONFIG_SYSCTL
 724         err = -ENOMEM;
 725         nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root);
 726         if (nlm_sysctl_table == NULL)
 727                 goto err_sysctl;
 728 #endif
 729         err = register_pernet_subsys(&lockd_net_ops);
 730         if (err)
 731                 goto err_pernet;
 732
 733         err = lockd_create_procfs();
 734         if (err)
 735                 goto err_procfs;
 736
 737         return 0;
 738
 739 err_procfs:
 740         unregister_pernet_subsys(&lockd_net_ops);
 741 err_pernet:
 742 #ifdef CONFIG_SYSCTL
 743         unregister_sysctl_table(nlm_sysctl_table);
 744 err_sysctl:
 745 #endif
 746         return err;
 747 }
 748
 749 static void __exit exit_nlm(void)
 750 {
 751         /* FIXME: delete all NLM clients */
 752         nlm_shutdown_hosts();
 753         lockd_remove_procfs();
 754         unregister_pernet_subsys(&lockd_net_ops);
 755 #ifdef CONFIG_SYSCTL
 756         unregister_sysctl_table(nlm_sysctl_table);
 757 #endif
 758 }
 759
 760 module_init(init_nlm);
 761 module_exit(exit_nlm);
 762
 763 /*
 764  * Define NLM program and procedures
 765  */
 766 static unsigned int nlmsvc_version1_count[17];
 767 static const struct svc_version nlmsvc_version1 = {
 768         .vs_vers        = 1,
 769         .vs_nproc       = 17,
 770         .vs_proc        = nlmsvc_procedures,
 771         .vs_count       = nlmsvc_version1_count,
 772         .vs_xdrsize     = NLMSVC_XDRSIZE,
 773 };
 774 static unsigned int nlmsvc_version3_count[24];
 775 static const struct svc_version nlmsvc_version3 = {
 776         .vs_vers        = 3,
 777         .vs_nproc       = 24,
 778         .vs_proc        = nlmsvc_procedures,
 779         .vs_count       = nlmsvc_version3_count,
 780         .vs_xdrsize     = NLMSVC_XDRSIZE,
 781 };
 782 #ifdef CONFIG_LOCKD_V4
 783 static unsigned int nlmsvc_version4_count[24];
 784 static const struct svc_version nlmsvc_version4 = {
 785         .vs_vers        = 4,
 786         .vs_nproc       = 24,
 787         .vs_proc        = nlmsvc_procedures4,
 788         .vs_count       = nlmsvc_version4_count,
 789         .vs_xdrsize     = NLMSVC_XDRSIZE,
 790 };
 791 #endif
 792 static const struct svc_version *nlmsvc_version[] = {
 793         [1] = &nlmsvc_version1,
 794         [3] = &nlmsvc_version3,
 795 #ifdef CONFIG_LOCKD_V4
 796         [4] = &nlmsvc_version4,
 797 #endif
 798 };
 799
 800 static struct svc_stat          nlmsvc_stats;
 801
 802 #define NLM_NRVERS      ARRAY_SIZE(nlmsvc_version)
 803 static struct svc_program       nlmsvc_program = {
 804         .pg_prog                = NLM_PROGRAM,          /* program number */
 805         .pg_nvers               = NLM_NRVERS,           /* number of entries in nlmsvc_version */
 806         .pg_vers                = nlmsvc_version,       /* version table */
 807         .pg_name                = "lockd",              /* service name */
 808         .pg_class               = "nfsd",               /* share authentication with nfsd */
 809         .pg_stats               = &nlmsvc_stats,        /* stats table */
 810         .pg_authenticate = &lockd_authenticate  /* export authentication */
 811 };