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