1 /* 2 * Central processing for nfsd. 3 * 4 * Authors: Olaf Kirch (okir@monad.swb.de) 5 * 6 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> 7 */ 8 9 #include <linux/sched.h> 10 #include <linux/freezer.h> 11 #include <linux/module.h> 12 #include <linux/fs_struct.h> 13 #include <linux/swap.h> 14 15 #include <linux/sunrpc/stats.h> 16 #include <linux/sunrpc/svcsock.h> 17 #include <linux/lockd/bind.h> 18 #include <linux/nfsacl.h> 19 #include <linux/seq_file.h> 20 #include <net/net_namespace.h> 21 #include "nfsd.h" 22 #include "cache.h" 23 #include "vfs.h" 24 #include "netns.h" 25 26 #define NFSDDBG_FACILITY NFSDDBG_SVC 27 28 extern struct svc_program nfsd_program; 29 static int nfsd(void *vrqstp); 30 31 /* 32 * nfsd_mutex protects nn->nfsd_serv -- both the pointer itself and the members 33 * of the svc_serv struct. In particular, ->sv_nrthreads but also to some 34 * extent ->sv_temp_socks and ->sv_permsocks. It also protects nfsdstats.th_cnt 35 * 36 * If (out side the lock) nn->nfsd_serv is non-NULL, then it must point to a 37 * properly initialised 'struct svc_serv' with ->sv_nrthreads > 0. That number 38 * of nfsd threads must exist and each must listed in ->sp_all_threads in each 39 * entry of ->sv_pools[]. 40 * 41 * Transitions of the thread count between zero and non-zero are of particular 42 * interest since the svc_serv needs to be created and initialized at that 43 * point, or freed. 44 * 45 * Finally, the nfsd_mutex also protects some of the global variables that are 46 * accessed when nfsd starts and that are settable via the write_* routines in 47 * nfsctl.c. In particular: 48 * 49 * user_recovery_dirname 50 * user_lease_time 51 * nfsd_versions 52 */ 53 DEFINE_MUTEX(nfsd_mutex); 54 55 /* 56 * nfsd_drc_lock protects nfsd_drc_max_pages and nfsd_drc_pages_used. 57 * nfsd_drc_max_pages limits the total amount of memory available for 58 * version 4.1 DRC caches. 59 * nfsd_drc_pages_used tracks the current version 4.1 DRC memory usage. 60 */ 61 spinlock_t nfsd_drc_lock; 62 unsigned int nfsd_drc_max_mem; 63 unsigned int nfsd_drc_mem_used; 64 65 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 66 static struct svc_stat nfsd_acl_svcstats; 67 static struct svc_version * nfsd_acl_version[] = { 68 [2] = &nfsd_acl_version2, 69 [3] = &nfsd_acl_version3, 70 }; 71 72 #define NFSD_ACL_MINVERS 2 73 #define NFSD_ACL_NRVERS ARRAY_SIZE(nfsd_acl_version) 74 static struct svc_version *nfsd_acl_versions[NFSD_ACL_NRVERS]; 75 76 static struct svc_program nfsd_acl_program = { 77 .pg_prog = NFS_ACL_PROGRAM, 78 .pg_nvers = NFSD_ACL_NRVERS, 79 .pg_vers = nfsd_acl_versions, 80 .pg_name = "nfsacl", 81 .pg_class = "nfsd", 82 .pg_stats = &nfsd_acl_svcstats, 83 .pg_authenticate = &svc_set_client, 84 }; 85 86 static struct svc_stat nfsd_acl_svcstats = { 87 .program = &nfsd_acl_program, 88 }; 89 #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 90 91 static struct svc_version * nfsd_version[] = { 92 [2] = &nfsd_version2, 93 #if defined(CONFIG_NFSD_V3) 94 [3] = &nfsd_version3, 95 #endif 96 #if defined(CONFIG_NFSD_V4) 97 [4] = &nfsd_version4, 98 #endif 99 }; 100 101 #define NFSD_MINVERS 2 102 #define NFSD_NRVERS ARRAY_SIZE(nfsd_version) 103 static struct svc_version *nfsd_versions[NFSD_NRVERS]; 104 105 struct svc_program nfsd_program = { 106 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 107 .pg_next = &nfsd_acl_program, 108 #endif 109 .pg_prog = NFS_PROGRAM, /* program number */ 110 .pg_nvers = NFSD_NRVERS, /* nr of entries in nfsd_version */ 111 .pg_vers = nfsd_versions, /* version table */ 112 .pg_name = "nfsd", /* program name */ 113 .pg_class = "nfsd", /* authentication class */ 114 .pg_stats = &nfsd_svcstats, /* version table */ 115 .pg_authenticate = &svc_set_client, /* export authentication */ 116 117 }; 118 119 u32 nfsd_supported_minorversion; 120 121 int nfsd_vers(int vers, enum vers_op change) 122 { 123 if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS) 124 return 0; 125 switch(change) { 126 case NFSD_SET: 127 nfsd_versions[vers] = nfsd_version[vers]; 128 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 129 if (vers < NFSD_ACL_NRVERS) 130 nfsd_acl_versions[vers] = nfsd_acl_version[vers]; 131 #endif 132 break; 133 case NFSD_CLEAR: 134 nfsd_versions[vers] = NULL; 135 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 136 if (vers < NFSD_ACL_NRVERS) 137 nfsd_acl_versions[vers] = NULL; 138 #endif 139 break; 140 case NFSD_TEST: 141 return nfsd_versions[vers] != NULL; 142 case NFSD_AVAIL: 143 return nfsd_version[vers] != NULL; 144 } 145 return 0; 146 } 147 148 int nfsd_minorversion(u32 minorversion, enum vers_op change) 149 { 150 if (minorversion > NFSD_SUPPORTED_MINOR_VERSION) 151 return -1; 152 switch(change) { 153 case NFSD_SET: 154 nfsd_supported_minorversion = minorversion; 155 break; 156 case NFSD_CLEAR: 157 if (minorversion == 0) 158 return -1; 159 nfsd_supported_minorversion = minorversion - 1; 160 break; 161 case NFSD_TEST: 162 return minorversion <= nfsd_supported_minorversion; 163 case NFSD_AVAIL: 164 return minorversion <= NFSD_SUPPORTED_MINOR_VERSION; 165 } 166 return 0; 167 } 168 169 /* 170 * Maximum number of nfsd processes 171 */ 172 #define NFSD_MAXSERVS 8192 173 174 int nfsd_nrthreads(struct net *net) 175 { 176 int rv = 0; 177 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 178 179 mutex_lock(&nfsd_mutex); 180 if (nn->nfsd_serv) 181 rv = nn->nfsd_serv->sv_nrthreads; 182 mutex_unlock(&nfsd_mutex); 183 return rv; 184 } 185 186 static int nfsd_init_socks(struct net *net) 187 { 188 int error; 189 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 190 191 if (!list_empty(&nn->nfsd_serv->sv_permsocks)) 192 return 0; 193 194 error = svc_create_xprt(nn->nfsd_serv, "udp", net, PF_INET, NFS_PORT, 195 SVC_SOCK_DEFAULTS); 196 if (error < 0) 197 return error; 198 199 error = svc_create_xprt(nn->nfsd_serv, "tcp", net, PF_INET, NFS_PORT, 200 SVC_SOCK_DEFAULTS); 201 if (error < 0) 202 return error; 203 204 return 0; 205 } 206 207 static int nfsd_users = 0; 208 209 static int nfsd_startup_generic(int nrservs) 210 { 211 int ret; 212 213 if (nfsd_users++) 214 return 0; 215 216 /* 217 * Readahead param cache - will no-op if it already exists. 218 * (Note therefore results will be suboptimal if number of 219 * threads is modified after nfsd start.) 220 */ 221 ret = nfsd_racache_init(2*nrservs); 222 if (ret) 223 return ret; 224 ret = nfs4_state_start(); 225 if (ret) 226 goto out_racache; 227 return 0; 228 229 out_racache: 230 nfsd_racache_shutdown(); 231 return ret; 232 } 233 234 static void nfsd_shutdown_generic(void) 235 { 236 if (--nfsd_users) 237 return; 238 239 nfs4_state_shutdown(); 240 nfsd_racache_shutdown(); 241 } 242 243 static int nfsd_startup_net(int nrservs, struct net *net) 244 { 245 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 246 int ret; 247 248 if (nn->nfsd_net_up) 249 return 0; 250 251 ret = nfsd_startup_generic(nrservs); 252 if (ret) 253 return ret; 254 ret = nfsd_init_socks(net); 255 if (ret) 256 goto out_socks; 257 ret = lockd_up(net); 258 if (ret) 259 goto out_socks; 260 ret = nfs4_state_start_net(net); 261 if (ret) 262 goto out_lockd; 263 264 nn->nfsd_net_up = true; 265 return 0; 266 267 out_lockd: 268 lockd_down(net); 269 out_socks: 270 nfsd_shutdown_generic(); 271 return ret; 272 } 273 274 static void nfsd_shutdown_net(struct net *net) 275 { 276 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 277 278 nfs4_state_shutdown_net(net); 279 lockd_down(net); 280 nn->nfsd_net_up = false; 281 nfsd_shutdown_generic(); 282 } 283 284 static void nfsd_last_thread(struct svc_serv *serv, struct net *net) 285 { 286 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 287 288 /* 289 * write_ports can create the server without actually starting 290 * any threads--if we get shut down before any threads are 291 * started, then nfsd_last_thread will be run before any of this 292 * other initialization has been done. 293 */ 294 if (!nn->nfsd_net_up) 295 return; 296 nfsd_shutdown_net(net); 297 298 svc_rpcb_cleanup(serv, net); 299 300 printk(KERN_WARNING "nfsd: last server has exited, flushing export " 301 "cache\n"); 302 nfsd_export_flush(net); 303 } 304 305 void nfsd_reset_versions(void) 306 { 307 int found_one = 0; 308 int i; 309 310 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) { 311 if (nfsd_program.pg_vers[i]) 312 found_one = 1; 313 } 314 315 if (!found_one) { 316 for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) 317 nfsd_program.pg_vers[i] = nfsd_version[i]; 318 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 319 for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) 320 nfsd_acl_program.pg_vers[i] = 321 nfsd_acl_version[i]; 322 #endif 323 } 324 } 325 326 /* 327 * Each session guarantees a negotiated per slot memory cache for replies 328 * which in turn consumes memory beyond the v2/v3/v4.0 server. A dedicated 329 * NFSv4.1 server might want to use more memory for a DRC than a machine 330 * with mutiple services. 331 * 332 * Impose a hard limit on the number of pages for the DRC which varies 333 * according to the machines free pages. This is of course only a default. 334 * 335 * For now this is a #defined shift which could be under admin control 336 * in the future. 337 */ 338 static void set_max_drc(void) 339 { 340 #define NFSD_DRC_SIZE_SHIFT 10 341 nfsd_drc_max_mem = (nr_free_buffer_pages() 342 >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; 343 nfsd_drc_mem_used = 0; 344 spin_lock_init(&nfsd_drc_lock); 345 dprintk("%s nfsd_drc_max_mem %u \n", __func__, nfsd_drc_max_mem); 346 } 347 348 static int nfsd_get_default_max_blksize(void) 349 { 350 struct sysinfo i; 351 unsigned long long target; 352 unsigned long ret; 353 354 si_meminfo(&i); 355 target = (i.totalram - i.totalhigh) << PAGE_SHIFT; 356 /* 357 * Aim for 1/4096 of memory per thread This gives 1MB on 4Gig 358 * machines, but only uses 32K on 128M machines. Bottom out at 359 * 8K on 32M and smaller. Of course, this is only a default. 360 */ 361 target >>= 12; 362 363 ret = NFSSVC_MAXBLKSIZE; 364 while (ret > target && ret >= 8*1024*2) 365 ret /= 2; 366 return ret; 367 } 368 369 int nfsd_create_serv(struct net *net) 370 { 371 int error; 372 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 373 374 WARN_ON(!mutex_is_locked(&nfsd_mutex)); 375 if (nn->nfsd_serv) { 376 svc_get(nn->nfsd_serv); 377 return 0; 378 } 379 if (nfsd_max_blksize == 0) 380 nfsd_max_blksize = nfsd_get_default_max_blksize(); 381 nfsd_reset_versions(); 382 nn->nfsd_serv = svc_create_pooled(&nfsd_program, nfsd_max_blksize, 383 nfsd_last_thread, nfsd, THIS_MODULE); 384 if (nn->nfsd_serv == NULL) 385 return -ENOMEM; 386 387 error = svc_bind(nn->nfsd_serv, net); 388 if (error < 0) { 389 svc_destroy(nn->nfsd_serv); 390 return error; 391 } 392 393 set_max_drc(); 394 do_gettimeofday(&nn->nfssvc_boot); /* record boot time */ 395 return 0; 396 } 397 398 int nfsd_nrpools(struct net *net) 399 { 400 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 401 402 if (nn->nfsd_serv == NULL) 403 return 0; 404 else 405 return nn->nfsd_serv->sv_nrpools; 406 } 407 408 int nfsd_get_nrthreads(int n, int *nthreads, struct net *net) 409 { 410 int i = 0; 411 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 412 413 if (nn->nfsd_serv != NULL) { 414 for (i = 0; i < nn->nfsd_serv->sv_nrpools && i < n; i++) 415 nthreads[i] = nn->nfsd_serv->sv_pools[i].sp_nrthreads; 416 } 417 418 return 0; 419 } 420 421 void nfsd_destroy(struct net *net) 422 { 423 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 424 int destroy = (nn->nfsd_serv->sv_nrthreads == 1); 425 426 if (destroy) 427 svc_shutdown_net(nn->nfsd_serv, net); 428 svc_destroy(nn->nfsd_serv); 429 if (destroy) 430 nn->nfsd_serv = NULL; 431 } 432 433 int nfsd_set_nrthreads(int n, int *nthreads, struct net *net) 434 { 435 int i = 0; 436 int tot = 0; 437 int err = 0; 438 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 439 440 WARN_ON(!mutex_is_locked(&nfsd_mutex)); 441 442 if (nn->nfsd_serv == NULL || n <= 0) 443 return 0; 444 445 if (n > nn->nfsd_serv->sv_nrpools) 446 n = nn->nfsd_serv->sv_nrpools; 447 448 /* enforce a global maximum number of threads */ 449 tot = 0; 450 for (i = 0; i < n; i++) { 451 if (nthreads[i] > NFSD_MAXSERVS) 452 nthreads[i] = NFSD_MAXSERVS; 453 tot += nthreads[i]; 454 } 455 if (tot > NFSD_MAXSERVS) { 456 /* total too large: scale down requested numbers */ 457 for (i = 0; i < n && tot > 0; i++) { 458 int new = nthreads[i] * NFSD_MAXSERVS / tot; 459 tot -= (nthreads[i] - new); 460 nthreads[i] = new; 461 } 462 for (i = 0; i < n && tot > 0; i++) { 463 nthreads[i]--; 464 tot--; 465 } 466 } 467 468 /* 469 * There must always be a thread in pool 0; the admin 470 * can't shut down NFS completely using pool_threads. 471 */ 472 if (nthreads[0] == 0) 473 nthreads[0] = 1; 474 475 /* apply the new numbers */ 476 svc_get(nn->nfsd_serv); 477 for (i = 0; i < n; i++) { 478 err = svc_set_num_threads(nn->nfsd_serv, &nn->nfsd_serv->sv_pools[i], 479 nthreads[i]); 480 if (err) 481 break; 482 } 483 nfsd_destroy(net); 484 return err; 485 } 486 487 /* 488 * Adjust the number of threads and return the new number of threads. 489 * This is also the function that starts the server if necessary, if 490 * this is the first time nrservs is nonzero. 491 */ 492 int 493 nfsd_svc(int nrservs, struct net *net) 494 { 495 int error; 496 bool nfsd_up_before; 497 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 498 499 mutex_lock(&nfsd_mutex); 500 dprintk("nfsd: creating service\n"); 501 if (nrservs <= 0) 502 nrservs = 0; 503 if (nrservs > NFSD_MAXSERVS) 504 nrservs = NFSD_MAXSERVS; 505 error = 0; 506 if (nrservs == 0 && nn->nfsd_serv == NULL) 507 goto out; 508 509 error = nfsd_create_serv(net); 510 if (error) 511 goto out; 512 513 nfsd_up_before = nn->nfsd_net_up; 514 515 error = nfsd_startup_net(nrservs, net); 516 if (error) 517 goto out_destroy; 518 error = svc_set_num_threads(nn->nfsd_serv, NULL, nrservs); 519 if (error) 520 goto out_shutdown; 521 /* We are holding a reference to nn->nfsd_serv which 522 * we don't want to count in the return value, 523 * so subtract 1 524 */ 525 error = nn->nfsd_serv->sv_nrthreads - 1; 526 out_shutdown: 527 if (error < 0 && !nfsd_up_before) 528 nfsd_shutdown_net(net); 529 out_destroy: 530 nfsd_destroy(net); /* Release server */ 531 out: 532 mutex_unlock(&nfsd_mutex); 533 return error; 534 } 535 536 537 /* 538 * This is the NFS server kernel thread 539 */ 540 static int 541 nfsd(void *vrqstp) 542 { 543 struct svc_rqst *rqstp = (struct svc_rqst *) vrqstp; 544 struct svc_xprt *perm_sock = list_entry(rqstp->rq_server->sv_permsocks.next, typeof(struct svc_xprt), xpt_list); 545 struct net *net = perm_sock->xpt_net; 546 int err; 547 548 /* Lock module and set up kernel thread */ 549 mutex_lock(&nfsd_mutex); 550 551 /* At this point, the thread shares current->fs 552 * with the init process. We need to create files with a 553 * umask of 0 instead of init's umask. */ 554 if (unshare_fs_struct() < 0) { 555 printk("Unable to start nfsd thread: out of memory\n"); 556 goto out; 557 } 558 559 current->fs->umask = 0; 560 561 /* 562 * thread is spawned with all signals set to SIG_IGN, re-enable 563 * the ones that will bring down the thread 564 */ 565 allow_signal(SIGKILL); 566 allow_signal(SIGHUP); 567 allow_signal(SIGINT); 568 allow_signal(SIGQUIT); 569 570 nfsdstats.th_cnt++; 571 mutex_unlock(&nfsd_mutex); 572 573 /* 574 * We want less throttling in balance_dirty_pages() so that nfs to 575 * localhost doesn't cause nfsd to lock up due to all the client's 576 * dirty pages. 577 */ 578 current->flags |= PF_LESS_THROTTLE; 579 set_freezable(); 580 581 /* 582 * The main request loop 583 */ 584 for (;;) { 585 /* 586 * Find a socket with data available and call its 587 * recvfrom routine. 588 */ 589 while ((err = svc_recv(rqstp, 60*60*HZ)) == -EAGAIN) 590 ; 591 if (err == -EINTR) 592 break; 593 validate_process_creds(); 594 svc_process(rqstp); 595 validate_process_creds(); 596 } 597 598 /* Clear signals before calling svc_exit_thread() */ 599 flush_signals(current); 600 601 mutex_lock(&nfsd_mutex); 602 nfsdstats.th_cnt --; 603 604 out: 605 rqstp->rq_server = NULL; 606 607 /* Release the thread */ 608 svc_exit_thread(rqstp); 609 610 nfsd_destroy(net); 611 612 /* Release module */ 613 mutex_unlock(&nfsd_mutex); 614 module_put_and_exit(0); 615 return 0; 616 } 617 618 static __be32 map_new_errors(u32 vers, __be32 nfserr) 619 { 620 if (nfserr == nfserr_jukebox && vers == 2) 621 return nfserr_dropit; 622 if (nfserr == nfserr_wrongsec && vers < 4) 623 return nfserr_acces; 624 return nfserr; 625 } 626 627 int 628 nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp) 629 { 630 struct svc_procedure *proc; 631 kxdrproc_t xdr; 632 __be32 nfserr; 633 __be32 *nfserrp; 634 635 dprintk("nfsd_dispatch: vers %d proc %d\n", 636 rqstp->rq_vers, rqstp->rq_proc); 637 proc = rqstp->rq_procinfo; 638 639 /* 640 * Give the xdr decoder a chance to change this if it wants 641 * (necessary in the NFSv4.0 compound case) 642 */ 643 rqstp->rq_cachetype = proc->pc_cachetype; 644 /* Decode arguments */ 645 xdr = proc->pc_decode; 646 if (xdr && !xdr(rqstp, (__be32*)rqstp->rq_arg.head[0].iov_base, 647 rqstp->rq_argp)) { 648 dprintk("nfsd: failed to decode arguments!\n"); 649 *statp = rpc_garbage_args; 650 return 1; 651 } 652 653 /* Check whether we have this call in the cache. */ 654 switch (nfsd_cache_lookup(rqstp)) { 655 case RC_INTR: 656 case RC_DROPIT: 657 return 0; 658 case RC_REPLY: 659 return 1; 660 case RC_DOIT:; 661 /* do it */ 662 } 663 664 /* need to grab the location to store the status, as 665 * nfsv4 does some encoding while processing 666 */ 667 nfserrp = rqstp->rq_res.head[0].iov_base 668 + rqstp->rq_res.head[0].iov_len; 669 rqstp->rq_res.head[0].iov_len += sizeof(__be32); 670 671 /* Now call the procedure handler, and encode NFS status. */ 672 nfserr = proc->pc_func(rqstp, rqstp->rq_argp, rqstp->rq_resp); 673 nfserr = map_new_errors(rqstp->rq_vers, nfserr); 674 if (nfserr == nfserr_dropit || rqstp->rq_dropme) { 675 dprintk("nfsd: Dropping request; may be revisited later\n"); 676 nfsd_cache_update(rqstp, RC_NOCACHE, NULL); 677 return 0; 678 } 679 680 if (rqstp->rq_proc != 0) 681 *nfserrp++ = nfserr; 682 683 /* Encode result. 684 * For NFSv2, additional info is never returned in case of an error. 685 */ 686 if (!(nfserr && rqstp->rq_vers == 2)) { 687 xdr = proc->pc_encode; 688 if (xdr && !xdr(rqstp, nfserrp, 689 rqstp->rq_resp)) { 690 /* Failed to encode result. Release cache entry */ 691 dprintk("nfsd: failed to encode result!\n"); 692 nfsd_cache_update(rqstp, RC_NOCACHE, NULL); 693 *statp = rpc_system_err; 694 return 1; 695 } 696 } 697 698 /* Store reply in cache. */ 699 nfsd_cache_update(rqstp, rqstp->rq_cachetype, statp + 1); 700 return 1; 701 } 702 703 int nfsd_pool_stats_open(struct inode *inode, struct file *file) 704 { 705 int ret; 706 struct net *net = &init_net; 707 struct nfsd_net *nn = net_generic(net, nfsd_net_id); 708 709 mutex_lock(&nfsd_mutex); 710 if (nn->nfsd_serv == NULL) { 711 mutex_unlock(&nfsd_mutex); 712 return -ENODEV; 713 } 714 /* bump up the psudo refcount while traversing */ 715 svc_get(nn->nfsd_serv); 716 ret = svc_pool_stats_open(nn->nfsd_serv, file); 717 mutex_unlock(&nfsd_mutex); 718 return ret; 719 } 720 721 int nfsd_pool_stats_release(struct inode *inode, struct file *file) 722 { 723 int ret = seq_release(inode, file); 724 struct net *net = &init_net; 725 726 mutex_lock(&nfsd_mutex); 727 /* this function really, really should have been called svc_put() */ 728 nfsd_destroy(net); 729 mutex_unlock(&nfsd_mutex); 730 return ret; 731 } 732