1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* client.c: NFS client sharing and management code 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/sched.h> 12 #include <linux/time.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/string.h> 16 #include <linux/stat.h> 17 #include <linux/errno.h> 18 #include <linux/unistd.h> 19 #include <linux/sunrpc/addr.h> 20 #include <linux/sunrpc/clnt.h> 21 #include <linux/sunrpc/stats.h> 22 #include <linux/sunrpc/metrics.h> 23 #include <linux/sunrpc/xprtsock.h> 24 #include <linux/sunrpc/xprtrdma.h> 25 #include <linux/nfs_fs.h> 26 #include <linux/nfs_mount.h> 27 #include <linux/nfs4_mount.h> 28 #include <linux/lockd/bind.h> 29 #include <linux/seq_file.h> 30 #include <linux/mount.h> 31 #include <linux/vfs.h> 32 #include <linux/inet.h> 33 #include <linux/in6.h> 34 #include <linux/slab.h> 35 #include <linux/idr.h> 36 #include <net/ipv6.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/sunrpc/bc_xprt.h> 39 #include <linux/nsproxy.h> 40 #include <linux/pid_namespace.h> 41 42 43 #include "nfs4_fs.h" 44 #include "callback.h" 45 #include "delegation.h" 46 #include "iostat.h" 47 #include "internal.h" 48 #include "fscache.h" 49 #include "pnfs.h" 50 #include "nfs.h" 51 #include "netns.h" 52 #include "sysfs.h" 53 54 #define NFSDBG_FACILITY NFSDBG_CLIENT 55 56 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 57 static DEFINE_SPINLOCK(nfs_version_lock); 58 static DEFINE_MUTEX(nfs_version_mutex); 59 static LIST_HEAD(nfs_versions); 60 61 /* 62 * RPC cruft for NFS 63 */ 64 static const struct rpc_version *nfs_version[5] = { 65 [2] = NULL, 66 [3] = NULL, 67 [4] = NULL, 68 }; 69 70 const struct rpc_program nfs_program = { 71 .name = "nfs", 72 .number = NFS_PROGRAM, 73 .nrvers = ARRAY_SIZE(nfs_version), 74 .version = nfs_version, 75 .stats = &nfs_rpcstat, 76 .pipe_dir_name = NFS_PIPE_DIRNAME, 77 }; 78 79 struct rpc_stat nfs_rpcstat = { 80 .program = &nfs_program 81 }; 82 83 static struct nfs_subversion *find_nfs_version(unsigned int version) 84 { 85 struct nfs_subversion *nfs; 86 spin_lock(&nfs_version_lock); 87 88 list_for_each_entry(nfs, &nfs_versions, list) { 89 if (nfs->rpc_ops->version == version) { 90 spin_unlock(&nfs_version_lock); 91 return nfs; 92 } 93 } 94 95 spin_unlock(&nfs_version_lock); 96 return ERR_PTR(-EPROTONOSUPPORT); 97 } 98 99 struct nfs_subversion *get_nfs_version(unsigned int version) 100 { 101 struct nfs_subversion *nfs = find_nfs_version(version); 102 103 if (IS_ERR(nfs)) { 104 mutex_lock(&nfs_version_mutex); 105 request_module("nfsv%d", version); 106 nfs = find_nfs_version(version); 107 mutex_unlock(&nfs_version_mutex); 108 } 109 110 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 111 return ERR_PTR(-EAGAIN); 112 return nfs; 113 } 114 115 void put_nfs_version(struct nfs_subversion *nfs) 116 { 117 module_put(nfs->owner); 118 } 119 120 void register_nfs_version(struct nfs_subversion *nfs) 121 { 122 spin_lock(&nfs_version_lock); 123 124 list_add(&nfs->list, &nfs_versions); 125 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 126 127 spin_unlock(&nfs_version_lock); 128 } 129 EXPORT_SYMBOL_GPL(register_nfs_version); 130 131 void unregister_nfs_version(struct nfs_subversion *nfs) 132 { 133 spin_lock(&nfs_version_lock); 134 135 nfs_version[nfs->rpc_ops->version] = NULL; 136 list_del(&nfs->list); 137 138 spin_unlock(&nfs_version_lock); 139 } 140 EXPORT_SYMBOL_GPL(unregister_nfs_version); 141 142 /* 143 * Allocate a shared client record 144 * 145 * Since these are allocated/deallocated very rarely, we don't 146 * bother putting them in a slab cache... 147 */ 148 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 149 { 150 struct nfs_client *clp; 151 int err = -ENOMEM; 152 153 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 154 goto error_0; 155 156 clp->cl_nfs_mod = cl_init->nfs_mod; 157 if (!try_module_get(clp->cl_nfs_mod->owner)) 158 goto error_dealloc; 159 160 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 161 162 refcount_set(&clp->cl_count, 1); 163 clp->cl_cons_state = NFS_CS_INITING; 164 165 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 166 clp->cl_addrlen = cl_init->addrlen; 167 168 if (cl_init->hostname) { 169 err = -ENOMEM; 170 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 171 if (!clp->cl_hostname) 172 goto error_cleanup; 173 } 174 175 INIT_LIST_HEAD(&clp->cl_superblocks); 176 clp->cl_rpcclient = ERR_PTR(-EINVAL); 177 178 clp->cl_proto = cl_init->proto; 179 clp->cl_nconnect = cl_init->nconnect; 180 clp->cl_net = get_net(cl_init->net); 181 182 clp->cl_principal = "*"; 183 nfs_fscache_get_client_cookie(clp); 184 185 return clp; 186 187 error_cleanup: 188 put_nfs_version(clp->cl_nfs_mod); 189 error_dealloc: 190 kfree(clp); 191 error_0: 192 return ERR_PTR(err); 193 } 194 EXPORT_SYMBOL_GPL(nfs_alloc_client); 195 196 #if IS_ENABLED(CONFIG_NFS_V4) 197 static void nfs_cleanup_cb_ident_idr(struct net *net) 198 { 199 struct nfs_net *nn = net_generic(net, nfs_net_id); 200 201 idr_destroy(&nn->cb_ident_idr); 202 } 203 204 /* nfs_client_lock held */ 205 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 206 { 207 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 208 209 if (clp->cl_cb_ident) 210 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 211 } 212 213 static void pnfs_init_server(struct nfs_server *server) 214 { 215 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 216 } 217 218 #else 219 static void nfs_cleanup_cb_ident_idr(struct net *net) 220 { 221 } 222 223 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 224 { 225 } 226 227 static void pnfs_init_server(struct nfs_server *server) 228 { 229 } 230 231 #endif /* CONFIG_NFS_V4 */ 232 233 /* 234 * Destroy a shared client record 235 */ 236 void nfs_free_client(struct nfs_client *clp) 237 { 238 nfs_fscache_release_client_cookie(clp); 239 240 /* -EIO all pending I/O */ 241 if (!IS_ERR(clp->cl_rpcclient)) 242 rpc_shutdown_client(clp->cl_rpcclient); 243 244 put_net(clp->cl_net); 245 put_nfs_version(clp->cl_nfs_mod); 246 kfree(clp->cl_hostname); 247 kfree(clp->cl_acceptor); 248 kfree(clp); 249 } 250 EXPORT_SYMBOL_GPL(nfs_free_client); 251 252 /* 253 * Release a reference to a shared client record 254 */ 255 void nfs_put_client(struct nfs_client *clp) 256 { 257 struct nfs_net *nn; 258 259 if (!clp) 260 return; 261 262 nn = net_generic(clp->cl_net, nfs_net_id); 263 264 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 265 list_del(&clp->cl_share_link); 266 nfs_cb_idr_remove_locked(clp); 267 spin_unlock(&nn->nfs_client_lock); 268 269 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 270 271 clp->rpc_ops->free_client(clp); 272 } 273 } 274 EXPORT_SYMBOL_GPL(nfs_put_client); 275 276 /* 277 * Find an nfs_client on the list that matches the initialisation data 278 * that is supplied. 279 */ 280 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 281 { 282 struct nfs_client *clp; 283 const struct sockaddr *sap = data->addr; 284 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 285 int error; 286 287 again: 288 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 289 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 290 /* Don't match clients that failed to initialise properly */ 291 if (clp->cl_cons_state < 0) 292 continue; 293 294 /* If a client is still initializing then we need to wait */ 295 if (clp->cl_cons_state > NFS_CS_READY) { 296 refcount_inc(&clp->cl_count); 297 spin_unlock(&nn->nfs_client_lock); 298 error = nfs_wait_client_init_complete(clp); 299 nfs_put_client(clp); 300 spin_lock(&nn->nfs_client_lock); 301 if (error < 0) 302 return ERR_PTR(error); 303 goto again; 304 } 305 306 /* Different NFS versions cannot share the same nfs_client */ 307 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 308 continue; 309 310 if (clp->cl_proto != data->proto) 311 continue; 312 /* Match nfsv4 minorversion */ 313 if (clp->cl_minorversion != data->minorversion) 314 continue; 315 316 /* Match request for a dedicated DS */ 317 if (test_bit(NFS_CS_DS, &data->init_flags) != 318 test_bit(NFS_CS_DS, &clp->cl_flags)) 319 continue; 320 321 /* Match the full socket address */ 322 if (!rpc_cmp_addr_port(sap, clap)) 323 /* Match all xprt_switch full socket addresses */ 324 if (IS_ERR(clp->cl_rpcclient) || 325 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 326 sap)) 327 continue; 328 329 refcount_inc(&clp->cl_count); 330 return clp; 331 } 332 return NULL; 333 } 334 335 /* 336 * Return true if @clp is done initializing, false if still working on it. 337 * 338 * Use nfs_client_init_status to check if it was successful. 339 */ 340 bool nfs_client_init_is_complete(const struct nfs_client *clp) 341 { 342 return clp->cl_cons_state <= NFS_CS_READY; 343 } 344 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 345 346 /* 347 * Return 0 if @clp was successfully initialized, -errno otherwise. 348 * 349 * This must be called *after* nfs_client_init_is_complete() returns true, 350 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 351 */ 352 int nfs_client_init_status(const struct nfs_client *clp) 353 { 354 /* called without checking nfs_client_init_is_complete */ 355 if (clp->cl_cons_state > NFS_CS_READY) { 356 WARN_ON_ONCE(1); 357 return -EINVAL; 358 } 359 return clp->cl_cons_state; 360 } 361 EXPORT_SYMBOL_GPL(nfs_client_init_status); 362 363 int nfs_wait_client_init_complete(const struct nfs_client *clp) 364 { 365 return wait_event_killable(nfs_client_active_wq, 366 nfs_client_init_is_complete(clp)); 367 } 368 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 369 370 /* 371 * Found an existing client. Make sure it's ready before returning. 372 */ 373 static struct nfs_client * 374 nfs_found_client(const struct nfs_client_initdata *cl_init, 375 struct nfs_client *clp) 376 { 377 int error; 378 379 error = nfs_wait_client_init_complete(clp); 380 if (error < 0) { 381 nfs_put_client(clp); 382 return ERR_PTR(-ERESTARTSYS); 383 } 384 385 if (clp->cl_cons_state < NFS_CS_READY) { 386 error = clp->cl_cons_state; 387 nfs_put_client(clp); 388 return ERR_PTR(error); 389 } 390 391 smp_rmb(); 392 return clp; 393 } 394 395 /* 396 * Look up a client by IP address and protocol version 397 * - creates a new record if one doesn't yet exist 398 */ 399 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 400 { 401 struct nfs_client *clp, *new = NULL; 402 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 403 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 404 405 if (cl_init->hostname == NULL) { 406 WARN_ON(1); 407 return NULL; 408 } 409 410 /* see if the client already exists */ 411 do { 412 spin_lock(&nn->nfs_client_lock); 413 414 clp = nfs_match_client(cl_init); 415 if (clp) { 416 spin_unlock(&nn->nfs_client_lock); 417 if (new) 418 new->rpc_ops->free_client(new); 419 if (IS_ERR(clp)) 420 return clp; 421 return nfs_found_client(cl_init, clp); 422 } 423 if (new) { 424 list_add_tail(&new->cl_share_link, 425 &nn->nfs_client_list); 426 spin_unlock(&nn->nfs_client_lock); 427 new->cl_flags = cl_init->init_flags; 428 return rpc_ops->init_client(new, cl_init); 429 } 430 431 spin_unlock(&nn->nfs_client_lock); 432 433 new = rpc_ops->alloc_client(cl_init); 434 } while (!IS_ERR(new)); 435 436 return new; 437 } 438 EXPORT_SYMBOL_GPL(nfs_get_client); 439 440 /* 441 * Mark a server as ready or failed 442 */ 443 void nfs_mark_client_ready(struct nfs_client *clp, int state) 444 { 445 smp_wmb(); 446 clp->cl_cons_state = state; 447 wake_up_all(&nfs_client_active_wq); 448 } 449 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 450 451 /* 452 * Initialise the timeout values for a connection 453 */ 454 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 455 int timeo, int retrans) 456 { 457 to->to_initval = timeo * HZ / 10; 458 to->to_retries = retrans; 459 460 switch (proto) { 461 case XPRT_TRANSPORT_TCP: 462 case XPRT_TRANSPORT_RDMA: 463 if (retrans == NFS_UNSPEC_RETRANS) 464 to->to_retries = NFS_DEF_TCP_RETRANS; 465 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 466 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 467 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 468 to->to_initval = NFS_MAX_TCP_TIMEOUT; 469 to->to_increment = to->to_initval; 470 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 471 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 472 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 473 if (to->to_maxval < to->to_initval) 474 to->to_maxval = to->to_initval; 475 to->to_exponential = 0; 476 break; 477 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 478 case XPRT_TRANSPORT_UDP: 479 if (retrans == NFS_UNSPEC_RETRANS) 480 to->to_retries = NFS_DEF_UDP_RETRANS; 481 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 482 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 483 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 484 to->to_initval = NFS_MAX_UDP_TIMEOUT; 485 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 486 to->to_exponential = 1; 487 break; 488 #endif 489 default: 490 BUG(); 491 } 492 } 493 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 494 495 /* 496 * Create an RPC client handle 497 */ 498 int nfs_create_rpc_client(struct nfs_client *clp, 499 const struct nfs_client_initdata *cl_init, 500 rpc_authflavor_t flavor) 501 { 502 struct rpc_clnt *clnt = NULL; 503 struct rpc_create_args args = { 504 .net = clp->cl_net, 505 .protocol = clp->cl_proto, 506 .nconnect = clp->cl_nconnect, 507 .address = (struct sockaddr *)&clp->cl_addr, 508 .addrsize = clp->cl_addrlen, 509 .timeout = cl_init->timeparms, 510 .servername = clp->cl_hostname, 511 .nodename = cl_init->nodename, 512 .program = &nfs_program, 513 .version = clp->rpc_ops->version, 514 .authflavor = flavor, 515 .cred = cl_init->cred, 516 }; 517 518 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 519 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 520 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 521 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 522 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 523 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 524 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 525 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 526 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 527 args.flags |= RPC_CLNT_CREATE_NOPING; 528 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 529 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 530 531 if (!IS_ERR(clp->cl_rpcclient)) 532 return 0; 533 534 clnt = rpc_create(&args); 535 if (IS_ERR(clnt)) { 536 dprintk("%s: cannot create RPC client. Error = %ld\n", 537 __func__, PTR_ERR(clnt)); 538 return PTR_ERR(clnt); 539 } 540 541 clnt->cl_principal = clp->cl_principal; 542 clp->cl_rpcclient = clnt; 543 return 0; 544 } 545 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 546 547 /* 548 * Version 2 or 3 client destruction 549 */ 550 static void nfs_destroy_server(struct nfs_server *server) 551 { 552 if (server->nlm_host) 553 nlmclnt_done(server->nlm_host); 554 } 555 556 /* 557 * Version 2 or 3 lockd setup 558 */ 559 static int nfs_start_lockd(struct nfs_server *server) 560 { 561 struct nlm_host *host; 562 struct nfs_client *clp = server->nfs_client; 563 struct nlmclnt_initdata nlm_init = { 564 .hostname = clp->cl_hostname, 565 .address = (struct sockaddr *)&clp->cl_addr, 566 .addrlen = clp->cl_addrlen, 567 .nfs_version = clp->rpc_ops->version, 568 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 569 1 : 0, 570 .net = clp->cl_net, 571 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 572 .cred = current_cred(), 573 }; 574 575 if (nlm_init.nfs_version > 3) 576 return 0; 577 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 578 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 579 return 0; 580 581 switch (clp->cl_proto) { 582 default: 583 nlm_init.protocol = IPPROTO_TCP; 584 break; 585 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 586 case XPRT_TRANSPORT_UDP: 587 nlm_init.protocol = IPPROTO_UDP; 588 #endif 589 } 590 591 host = nlmclnt_init(&nlm_init); 592 if (IS_ERR(host)) 593 return PTR_ERR(host); 594 595 server->nlm_host = host; 596 server->destroy = nfs_destroy_server; 597 return 0; 598 } 599 600 /* 601 * Create a general RPC client 602 */ 603 int nfs_init_server_rpcclient(struct nfs_server *server, 604 const struct rpc_timeout *timeo, 605 rpc_authflavor_t pseudoflavour) 606 { 607 struct nfs_client *clp = server->nfs_client; 608 609 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 610 pseudoflavour); 611 if (IS_ERR(server->client)) { 612 dprintk("%s: couldn't create rpc_client!\n", __func__); 613 return PTR_ERR(server->client); 614 } 615 616 memcpy(&server->client->cl_timeout_default, 617 timeo, 618 sizeof(server->client->cl_timeout_default)); 619 server->client->cl_timeout = &server->client->cl_timeout_default; 620 server->client->cl_softrtry = 0; 621 if (server->flags & NFS_MOUNT_SOFTERR) 622 server->client->cl_softerr = 1; 623 if (server->flags & NFS_MOUNT_SOFT) 624 server->client->cl_softrtry = 1; 625 626 return 0; 627 } 628 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 629 630 /** 631 * nfs_init_client - Initialise an NFS2 or NFS3 client 632 * 633 * @clp: nfs_client to initialise 634 * @cl_init: Initialisation parameters 635 * 636 * Returns pointer to an NFS client, or an ERR_PTR value. 637 */ 638 struct nfs_client *nfs_init_client(struct nfs_client *clp, 639 const struct nfs_client_initdata *cl_init) 640 { 641 int error; 642 643 /* the client is already initialised */ 644 if (clp->cl_cons_state == NFS_CS_READY) 645 return clp; 646 647 /* 648 * Create a client RPC handle for doing FSSTAT with UNIX auth only 649 * - RFC 2623, sec 2.3.2 650 */ 651 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 652 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 653 if (error < 0) { 654 nfs_put_client(clp); 655 clp = ERR_PTR(error); 656 } 657 return clp; 658 } 659 EXPORT_SYMBOL_GPL(nfs_init_client); 660 661 /* 662 * Create a version 2 or 3 client 663 */ 664 static int nfs_init_server(struct nfs_server *server, 665 const struct fs_context *fc) 666 { 667 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 668 struct rpc_timeout timeparms; 669 struct nfs_client_initdata cl_init = { 670 .hostname = ctx->nfs_server.hostname, 671 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 672 .addrlen = ctx->nfs_server.addrlen, 673 .nfs_mod = ctx->nfs_mod, 674 .proto = ctx->nfs_server.protocol, 675 .net = fc->net_ns, 676 .timeparms = &timeparms, 677 .cred = server->cred, 678 .nconnect = ctx->nfs_server.nconnect, 679 .init_flags = (1UL << NFS_CS_REUSEPORT), 680 }; 681 struct nfs_client *clp; 682 int error; 683 684 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 685 ctx->timeo, ctx->retrans); 686 if (ctx->flags & NFS_MOUNT_NORESVPORT) 687 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 688 689 /* Allocate or find a client reference we can use */ 690 clp = nfs_get_client(&cl_init); 691 if (IS_ERR(clp)) 692 return PTR_ERR(clp); 693 694 server->nfs_client = clp; 695 696 /* Initialise the client representation from the mount data */ 697 server->flags = ctx->flags; 698 server->options = ctx->options; 699 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 700 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 701 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 702 703 if (ctx->rsize) 704 server->rsize = nfs_block_size(ctx->rsize, NULL); 705 if (ctx->wsize) 706 server->wsize = nfs_block_size(ctx->wsize, NULL); 707 708 server->acregmin = ctx->acregmin * HZ; 709 server->acregmax = ctx->acregmax * HZ; 710 server->acdirmin = ctx->acdirmin * HZ; 711 server->acdirmax = ctx->acdirmax * HZ; 712 713 /* Start lockd here, before we might error out */ 714 error = nfs_start_lockd(server); 715 if (error < 0) 716 goto error; 717 718 server->port = ctx->nfs_server.port; 719 server->auth_info = ctx->auth_info; 720 721 error = nfs_init_server_rpcclient(server, &timeparms, 722 ctx->selected_flavor); 723 if (error < 0) 724 goto error; 725 726 /* Preserve the values of mount_server-related mount options */ 727 if (ctx->mount_server.addrlen) { 728 memcpy(&server->mountd_address, &ctx->mount_server.address, 729 ctx->mount_server.addrlen); 730 server->mountd_addrlen = ctx->mount_server.addrlen; 731 } 732 server->mountd_version = ctx->mount_server.version; 733 server->mountd_port = ctx->mount_server.port; 734 server->mountd_protocol = ctx->mount_server.protocol; 735 736 server->namelen = ctx->namlen; 737 return 0; 738 739 error: 740 server->nfs_client = NULL; 741 nfs_put_client(clp); 742 return error; 743 } 744 745 /* 746 * Load up the server record from information gained in an fsinfo record 747 */ 748 static void nfs_server_set_fsinfo(struct nfs_server *server, 749 struct nfs_fsinfo *fsinfo) 750 { 751 unsigned long max_rpc_payload; 752 753 /* Work out a lot of parameters */ 754 if (server->rsize == 0) 755 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 756 if (server->wsize == 0) 757 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 758 759 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 760 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 761 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 762 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 763 764 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 765 if (server->rsize > max_rpc_payload) 766 server->rsize = max_rpc_payload; 767 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 768 server->rsize = NFS_MAX_FILE_IO_SIZE; 769 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 770 771 if (server->wsize > max_rpc_payload) 772 server->wsize = max_rpc_payload; 773 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 774 server->wsize = NFS_MAX_FILE_IO_SIZE; 775 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 776 777 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 778 779 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 780 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 781 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 782 if (server->dtsize > server->rsize) 783 server->dtsize = server->rsize; 784 785 if (server->flags & NFS_MOUNT_NOAC) { 786 server->acregmin = server->acregmax = 0; 787 server->acdirmin = server->acdirmax = 0; 788 } 789 790 server->maxfilesize = fsinfo->maxfilesize; 791 792 server->time_delta = fsinfo->time_delta; 793 794 server->clone_blksize = fsinfo->clone_blksize; 795 /* We're airborne Set socket buffersize */ 796 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 797 } 798 799 /* 800 * Probe filesystem information, including the FSID on v2/v3 801 */ 802 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 803 { 804 struct nfs_fsinfo fsinfo; 805 struct nfs_client *clp = server->nfs_client; 806 int error; 807 808 if (clp->rpc_ops->set_capabilities != NULL) { 809 error = clp->rpc_ops->set_capabilities(server, mntfh); 810 if (error < 0) 811 return error; 812 } 813 814 fsinfo.fattr = fattr; 815 fsinfo.nlayouttypes = 0; 816 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 817 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 818 if (error < 0) 819 return error; 820 821 nfs_server_set_fsinfo(server, &fsinfo); 822 823 /* Get some general file system info */ 824 if (server->namelen == 0) { 825 struct nfs_pathconf pathinfo; 826 827 pathinfo.fattr = fattr; 828 nfs_fattr_init(fattr); 829 830 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 831 server->namelen = pathinfo.max_namelen; 832 } 833 834 return 0; 835 } 836 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 837 838 /* 839 * Copy useful information when duplicating a server record 840 */ 841 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 842 { 843 target->flags = source->flags; 844 target->rsize = source->rsize; 845 target->wsize = source->wsize; 846 target->acregmin = source->acregmin; 847 target->acregmax = source->acregmax; 848 target->acdirmin = source->acdirmin; 849 target->acdirmax = source->acdirmax; 850 target->caps = source->caps; 851 target->options = source->options; 852 target->auth_info = source->auth_info; 853 target->port = source->port; 854 } 855 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 856 857 void nfs_server_insert_lists(struct nfs_server *server) 858 { 859 struct nfs_client *clp = server->nfs_client; 860 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 861 862 spin_lock(&nn->nfs_client_lock); 863 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 864 list_add_tail(&server->master_link, &nn->nfs_volume_list); 865 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 866 spin_unlock(&nn->nfs_client_lock); 867 868 } 869 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 870 871 void nfs_server_remove_lists(struct nfs_server *server) 872 { 873 struct nfs_client *clp = server->nfs_client; 874 struct nfs_net *nn; 875 876 if (clp == NULL) 877 return; 878 nn = net_generic(clp->cl_net, nfs_net_id); 879 spin_lock(&nn->nfs_client_lock); 880 list_del_rcu(&server->client_link); 881 if (list_empty(&clp->cl_superblocks)) 882 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 883 list_del(&server->master_link); 884 spin_unlock(&nn->nfs_client_lock); 885 886 synchronize_rcu(); 887 } 888 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 889 890 /* 891 * Allocate and initialise a server record 892 */ 893 struct nfs_server *nfs_alloc_server(void) 894 { 895 struct nfs_server *server; 896 897 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 898 if (!server) 899 return NULL; 900 901 server->client = server->client_acl = ERR_PTR(-EINVAL); 902 903 /* Zero out the NFS state stuff */ 904 INIT_LIST_HEAD(&server->client_link); 905 INIT_LIST_HEAD(&server->master_link); 906 INIT_LIST_HEAD(&server->delegations); 907 INIT_LIST_HEAD(&server->layouts); 908 INIT_LIST_HEAD(&server->state_owners_lru); 909 INIT_LIST_HEAD(&server->ss_copies); 910 911 atomic_set(&server->active, 0); 912 913 server->io_stats = nfs_alloc_iostats(); 914 if (!server->io_stats) { 915 kfree(server); 916 return NULL; 917 } 918 919 ida_init(&server->openowner_id); 920 ida_init(&server->lockowner_id); 921 pnfs_init_server(server); 922 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 923 924 return server; 925 } 926 EXPORT_SYMBOL_GPL(nfs_alloc_server); 927 928 /* 929 * Free up a server record 930 */ 931 void nfs_free_server(struct nfs_server *server) 932 { 933 nfs_server_remove_lists(server); 934 935 if (server->destroy != NULL) 936 server->destroy(server); 937 938 if (!IS_ERR(server->client_acl)) 939 rpc_shutdown_client(server->client_acl); 940 if (!IS_ERR(server->client)) 941 rpc_shutdown_client(server->client); 942 943 nfs_put_client(server->nfs_client); 944 945 ida_destroy(&server->lockowner_id); 946 ida_destroy(&server->openowner_id); 947 nfs_free_iostats(server->io_stats); 948 put_cred(server->cred); 949 kfree(server); 950 nfs_release_automount_timer(); 951 } 952 EXPORT_SYMBOL_GPL(nfs_free_server); 953 954 /* 955 * Create a version 2 or 3 volume record 956 * - keyed on server and FSID 957 */ 958 struct nfs_server *nfs_create_server(struct fs_context *fc) 959 { 960 struct nfs_fs_context *ctx = nfs_fc2context(fc); 961 struct nfs_server *server; 962 struct nfs_fattr *fattr; 963 int error; 964 965 server = nfs_alloc_server(); 966 if (!server) 967 return ERR_PTR(-ENOMEM); 968 969 server->cred = get_cred(current_cred()); 970 971 error = -ENOMEM; 972 fattr = nfs_alloc_fattr(); 973 if (fattr == NULL) 974 goto error; 975 976 /* Get a client representation */ 977 error = nfs_init_server(server, fc); 978 if (error < 0) 979 goto error; 980 981 /* Probe the root fh to retrieve its FSID */ 982 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 983 if (error < 0) 984 goto error; 985 if (server->nfs_client->rpc_ops->version == 3) { 986 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 987 server->namelen = NFS3_MAXNAMLEN; 988 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 989 server->caps |= NFS_CAP_READDIRPLUS; 990 } else { 991 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 992 server->namelen = NFS2_MAXNAMLEN; 993 } 994 995 if (!(fattr->valid & NFS_ATTR_FATTR)) { 996 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 997 fattr, NULL, NULL); 998 if (error < 0) { 999 dprintk("nfs_create_server: getattr error = %d\n", -error); 1000 goto error; 1001 } 1002 } 1003 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1004 1005 dprintk("Server FSID: %llx:%llx\n", 1006 (unsigned long long) server->fsid.major, 1007 (unsigned long long) server->fsid.minor); 1008 1009 nfs_server_insert_lists(server); 1010 server->mount_time = jiffies; 1011 nfs_free_fattr(fattr); 1012 return server; 1013 1014 error: 1015 nfs_free_fattr(fattr); 1016 nfs_free_server(server); 1017 return ERR_PTR(error); 1018 } 1019 EXPORT_SYMBOL_GPL(nfs_create_server); 1020 1021 /* 1022 * Clone an NFS2, NFS3 or NFS4 server record 1023 */ 1024 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1025 struct nfs_fh *fh, 1026 struct nfs_fattr *fattr, 1027 rpc_authflavor_t flavor) 1028 { 1029 struct nfs_server *server; 1030 struct nfs_fattr *fattr_fsinfo; 1031 int error; 1032 1033 server = nfs_alloc_server(); 1034 if (!server) 1035 return ERR_PTR(-ENOMEM); 1036 1037 server->cred = get_cred(source->cred); 1038 1039 error = -ENOMEM; 1040 fattr_fsinfo = nfs_alloc_fattr(); 1041 if (fattr_fsinfo == NULL) 1042 goto out_free_server; 1043 1044 /* Copy data from the source */ 1045 server->nfs_client = source->nfs_client; 1046 server->destroy = source->destroy; 1047 refcount_inc(&server->nfs_client->cl_count); 1048 nfs_server_copy_userdata(server, source); 1049 1050 server->fsid = fattr->fsid; 1051 1052 error = nfs_init_server_rpcclient(server, 1053 source->client->cl_timeout, 1054 flavor); 1055 if (error < 0) 1056 goto out_free_server; 1057 1058 /* probe the filesystem info for this server filesystem */ 1059 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1060 if (error < 0) 1061 goto out_free_server; 1062 1063 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1064 server->namelen = NFS4_MAXNAMLEN; 1065 1066 error = nfs_start_lockd(server); 1067 if (error < 0) 1068 goto out_free_server; 1069 1070 nfs_server_insert_lists(server); 1071 server->mount_time = jiffies; 1072 1073 nfs_free_fattr(fattr_fsinfo); 1074 return server; 1075 1076 out_free_server: 1077 nfs_free_fattr(fattr_fsinfo); 1078 nfs_free_server(server); 1079 return ERR_PTR(error); 1080 } 1081 EXPORT_SYMBOL_GPL(nfs_clone_server); 1082 1083 void nfs_clients_init(struct net *net) 1084 { 1085 struct nfs_net *nn = net_generic(net, nfs_net_id); 1086 1087 INIT_LIST_HEAD(&nn->nfs_client_list); 1088 INIT_LIST_HEAD(&nn->nfs_volume_list); 1089 #if IS_ENABLED(CONFIG_NFS_V4) 1090 idr_init(&nn->cb_ident_idr); 1091 #endif 1092 spin_lock_init(&nn->nfs_client_lock); 1093 nn->boot_time = ktime_get_real(); 1094 1095 nfs_netns_sysfs_setup(nn, net); 1096 } 1097 1098 void nfs_clients_exit(struct net *net) 1099 { 1100 struct nfs_net *nn = net_generic(net, nfs_net_id); 1101 1102 nfs_netns_sysfs_destroy(nn); 1103 nfs_cleanup_cb_ident_idr(net); 1104 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1105 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1106 } 1107 1108 #ifdef CONFIG_PROC_FS 1109 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1110 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1111 static void nfs_server_list_stop(struct seq_file *p, void *v); 1112 static int nfs_server_list_show(struct seq_file *m, void *v); 1113 1114 static const struct seq_operations nfs_server_list_ops = { 1115 .start = nfs_server_list_start, 1116 .next = nfs_server_list_next, 1117 .stop = nfs_server_list_stop, 1118 .show = nfs_server_list_show, 1119 }; 1120 1121 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1122 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1123 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1124 static int nfs_volume_list_show(struct seq_file *m, void *v); 1125 1126 static const struct seq_operations nfs_volume_list_ops = { 1127 .start = nfs_volume_list_start, 1128 .next = nfs_volume_list_next, 1129 .stop = nfs_volume_list_stop, 1130 .show = nfs_volume_list_show, 1131 }; 1132 1133 /* 1134 * set up the iterator to start reading from the server list and return the first item 1135 */ 1136 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1137 __acquires(&nn->nfs_client_lock) 1138 { 1139 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1140 1141 /* lock the list against modification */ 1142 spin_lock(&nn->nfs_client_lock); 1143 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1144 } 1145 1146 /* 1147 * move to next server 1148 */ 1149 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1150 { 1151 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1152 1153 return seq_list_next(v, &nn->nfs_client_list, pos); 1154 } 1155 1156 /* 1157 * clean up after reading from the transports list 1158 */ 1159 static void nfs_server_list_stop(struct seq_file *p, void *v) 1160 __releases(&nn->nfs_client_lock) 1161 { 1162 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1163 1164 spin_unlock(&nn->nfs_client_lock); 1165 } 1166 1167 /* 1168 * display a header line followed by a load of call lines 1169 */ 1170 static int nfs_server_list_show(struct seq_file *m, void *v) 1171 { 1172 struct nfs_client *clp; 1173 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1174 1175 /* display header on line 1 */ 1176 if (v == &nn->nfs_client_list) { 1177 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1178 return 0; 1179 } 1180 1181 /* display one transport per line on subsequent lines */ 1182 clp = list_entry(v, struct nfs_client, cl_share_link); 1183 1184 /* Check if the client is initialized */ 1185 if (clp->cl_cons_state != NFS_CS_READY) 1186 return 0; 1187 1188 rcu_read_lock(); 1189 seq_printf(m, "v%u %s %s %3d %s\n", 1190 clp->rpc_ops->version, 1191 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1192 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1193 refcount_read(&clp->cl_count), 1194 clp->cl_hostname); 1195 rcu_read_unlock(); 1196 1197 return 0; 1198 } 1199 1200 /* 1201 * set up the iterator to start reading from the volume list and return the first item 1202 */ 1203 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1204 __acquires(&nn->nfs_client_lock) 1205 { 1206 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1207 1208 /* lock the list against modification */ 1209 spin_lock(&nn->nfs_client_lock); 1210 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1211 } 1212 1213 /* 1214 * move to next volume 1215 */ 1216 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1217 { 1218 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1219 1220 return seq_list_next(v, &nn->nfs_volume_list, pos); 1221 } 1222 1223 /* 1224 * clean up after reading from the transports list 1225 */ 1226 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1227 __releases(&nn->nfs_client_lock) 1228 { 1229 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1230 1231 spin_unlock(&nn->nfs_client_lock); 1232 } 1233 1234 /* 1235 * display a header line followed by a load of call lines 1236 */ 1237 static int nfs_volume_list_show(struct seq_file *m, void *v) 1238 { 1239 struct nfs_server *server; 1240 struct nfs_client *clp; 1241 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1242 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1243 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1244 1245 /* display header on line 1 */ 1246 if (v == &nn->nfs_volume_list) { 1247 seq_puts(m, "NV SERVER PORT DEV FSID" 1248 " FSC\n"); 1249 return 0; 1250 } 1251 /* display one transport per line on subsequent lines */ 1252 server = list_entry(v, struct nfs_server, master_link); 1253 clp = server->nfs_client; 1254 1255 snprintf(dev, sizeof(dev), "%u:%u", 1256 MAJOR(server->s_dev), MINOR(server->s_dev)); 1257 1258 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1259 (unsigned long long) server->fsid.major, 1260 (unsigned long long) server->fsid.minor); 1261 1262 rcu_read_lock(); 1263 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1264 clp->rpc_ops->version, 1265 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1266 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1267 dev, 1268 fsid, 1269 nfs_server_fscache_state(server)); 1270 rcu_read_unlock(); 1271 1272 return 0; 1273 } 1274 1275 int nfs_fs_proc_net_init(struct net *net) 1276 { 1277 struct nfs_net *nn = net_generic(net, nfs_net_id); 1278 struct proc_dir_entry *p; 1279 1280 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1281 if (!nn->proc_nfsfs) 1282 goto error_0; 1283 1284 /* a file of servers with which we're dealing */ 1285 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1286 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1287 if (!p) 1288 goto error_1; 1289 1290 /* a file of volumes that we have mounted */ 1291 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1292 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1293 if (!p) 1294 goto error_1; 1295 return 0; 1296 1297 error_1: 1298 remove_proc_subtree("nfsfs", net->proc_net); 1299 error_0: 1300 return -ENOMEM; 1301 } 1302 1303 void nfs_fs_proc_net_exit(struct net *net) 1304 { 1305 remove_proc_subtree("nfsfs", net->proc_net); 1306 } 1307 1308 /* 1309 * initialise the /proc/fs/nfsfs/ directory 1310 */ 1311 int __init nfs_fs_proc_init(void) 1312 { 1313 if (!proc_mkdir("fs/nfsfs", NULL)) 1314 goto error_0; 1315 1316 /* a file of servers with which we're dealing */ 1317 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1318 goto error_1; 1319 1320 /* a file of volumes that we have mounted */ 1321 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1322 goto error_1; 1323 1324 return 0; 1325 error_1: 1326 remove_proc_subtree("fs/nfsfs", NULL); 1327 error_0: 1328 return -ENOMEM; 1329 } 1330 1331 /* 1332 * clean up the /proc/fs/nfsfs/ directory 1333 */ 1334 void nfs_fs_proc_exit(void) 1335 { 1336 remove_proc_subtree("fs/nfsfs", NULL); 1337 } 1338 1339 #endif /* CONFIG_PROC_FS */ 1340