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_minorversion = cl_init->minorversion; 157 clp->cl_nfs_mod = cl_init->nfs_mod; 158 if (!try_module_get(clp->cl_nfs_mod->owner)) 159 goto error_dealloc; 160 161 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 162 163 refcount_set(&clp->cl_count, 1); 164 clp->cl_cons_state = NFS_CS_INITING; 165 166 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 167 clp->cl_addrlen = cl_init->addrlen; 168 169 if (cl_init->hostname) { 170 err = -ENOMEM; 171 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 172 if (!clp->cl_hostname) 173 goto error_cleanup; 174 } 175 176 INIT_LIST_HEAD(&clp->cl_superblocks); 177 clp->cl_rpcclient = ERR_PTR(-EINVAL); 178 179 clp->cl_proto = cl_init->proto; 180 clp->cl_nconnect = cl_init->nconnect; 181 clp->cl_net = get_net(cl_init->net); 182 183 clp->cl_principal = "*"; 184 nfs_fscache_get_client_cookie(clp); 185 186 return clp; 187 188 error_cleanup: 189 put_nfs_version(clp->cl_nfs_mod); 190 error_dealloc: 191 kfree(clp); 192 error_0: 193 return ERR_PTR(err); 194 } 195 EXPORT_SYMBOL_GPL(nfs_alloc_client); 196 197 #if IS_ENABLED(CONFIG_NFS_V4) 198 static void nfs_cleanup_cb_ident_idr(struct net *net) 199 { 200 struct nfs_net *nn = net_generic(net, nfs_net_id); 201 202 idr_destroy(&nn->cb_ident_idr); 203 } 204 205 /* nfs_client_lock held */ 206 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 207 { 208 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 209 210 if (clp->cl_cb_ident) 211 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 212 } 213 214 static void pnfs_init_server(struct nfs_server *server) 215 { 216 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 217 } 218 219 #else 220 static void nfs_cleanup_cb_ident_idr(struct net *net) 221 { 222 } 223 224 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 225 { 226 } 227 228 static void pnfs_init_server(struct nfs_server *server) 229 { 230 } 231 232 #endif /* CONFIG_NFS_V4 */ 233 234 /* 235 * Destroy a shared client record 236 */ 237 void nfs_free_client(struct nfs_client *clp) 238 { 239 nfs_fscache_release_client_cookie(clp); 240 241 /* -EIO all pending I/O */ 242 if (!IS_ERR(clp->cl_rpcclient)) 243 rpc_shutdown_client(clp->cl_rpcclient); 244 245 put_net(clp->cl_net); 246 put_nfs_version(clp->cl_nfs_mod); 247 kfree(clp->cl_hostname); 248 kfree(clp->cl_acceptor); 249 kfree(clp); 250 } 251 EXPORT_SYMBOL_GPL(nfs_free_client); 252 253 /* 254 * Release a reference to a shared client record 255 */ 256 void nfs_put_client(struct nfs_client *clp) 257 { 258 struct nfs_net *nn; 259 260 if (!clp) 261 return; 262 263 nn = net_generic(clp->cl_net, nfs_net_id); 264 265 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 266 list_del(&clp->cl_share_link); 267 nfs_cb_idr_remove_locked(clp); 268 spin_unlock(&nn->nfs_client_lock); 269 270 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 271 272 clp->rpc_ops->free_client(clp); 273 } 274 } 275 EXPORT_SYMBOL_GPL(nfs_put_client); 276 277 /* 278 * Find an nfs_client on the list that matches the initialisation data 279 * that is supplied. 280 */ 281 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 282 { 283 struct nfs_client *clp; 284 const struct sockaddr *sap = data->addr; 285 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 286 int error; 287 288 again: 289 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 290 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 291 /* Don't match clients that failed to initialise properly */ 292 if (clp->cl_cons_state < 0) 293 continue; 294 295 /* If a client is still initializing then we need to wait */ 296 if (clp->cl_cons_state > NFS_CS_READY) { 297 refcount_inc(&clp->cl_count); 298 spin_unlock(&nn->nfs_client_lock); 299 error = nfs_wait_client_init_complete(clp); 300 nfs_put_client(clp); 301 spin_lock(&nn->nfs_client_lock); 302 if (error < 0) 303 return ERR_PTR(error); 304 goto again; 305 } 306 307 /* Different NFS versions cannot share the same nfs_client */ 308 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 309 continue; 310 311 if (clp->cl_proto != data->proto) 312 continue; 313 /* Match nfsv4 minorversion */ 314 if (clp->cl_minorversion != data->minorversion) 315 continue; 316 317 /* Match request for a dedicated DS */ 318 if (test_bit(NFS_CS_DS, &data->init_flags) != 319 test_bit(NFS_CS_DS, &clp->cl_flags)) 320 continue; 321 322 /* Match the full socket address */ 323 if (!rpc_cmp_addr_port(sap, clap)) 324 /* Match all xprt_switch full socket addresses */ 325 if (IS_ERR(clp->cl_rpcclient) || 326 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 327 sap)) 328 continue; 329 330 refcount_inc(&clp->cl_count); 331 return clp; 332 } 333 return NULL; 334 } 335 336 /* 337 * Return true if @clp is done initializing, false if still working on it. 338 * 339 * Use nfs_client_init_status to check if it was successful. 340 */ 341 bool nfs_client_init_is_complete(const struct nfs_client *clp) 342 { 343 return clp->cl_cons_state <= NFS_CS_READY; 344 } 345 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 346 347 /* 348 * Return 0 if @clp was successfully initialized, -errno otherwise. 349 * 350 * This must be called *after* nfs_client_init_is_complete() returns true, 351 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 352 */ 353 int nfs_client_init_status(const struct nfs_client *clp) 354 { 355 /* called without checking nfs_client_init_is_complete */ 356 if (clp->cl_cons_state > NFS_CS_READY) { 357 WARN_ON_ONCE(1); 358 return -EINVAL; 359 } 360 return clp->cl_cons_state; 361 } 362 EXPORT_SYMBOL_GPL(nfs_client_init_status); 363 364 int nfs_wait_client_init_complete(const struct nfs_client *clp) 365 { 366 return wait_event_killable(nfs_client_active_wq, 367 nfs_client_init_is_complete(clp)); 368 } 369 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 370 371 /* 372 * Found an existing client. Make sure it's ready before returning. 373 */ 374 static struct nfs_client * 375 nfs_found_client(const struct nfs_client_initdata *cl_init, 376 struct nfs_client *clp) 377 { 378 int error; 379 380 error = nfs_wait_client_init_complete(clp); 381 if (error < 0) { 382 nfs_put_client(clp); 383 return ERR_PTR(-ERESTARTSYS); 384 } 385 386 if (clp->cl_cons_state < NFS_CS_READY) { 387 error = clp->cl_cons_state; 388 nfs_put_client(clp); 389 return ERR_PTR(error); 390 } 391 392 smp_rmb(); 393 return clp; 394 } 395 396 /* 397 * Look up a client by IP address and protocol version 398 * - creates a new record if one doesn't yet exist 399 */ 400 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 401 { 402 struct nfs_client *clp, *new = NULL; 403 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 404 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 405 406 if (cl_init->hostname == NULL) { 407 WARN_ON(1); 408 return NULL; 409 } 410 411 /* see if the client already exists */ 412 do { 413 spin_lock(&nn->nfs_client_lock); 414 415 clp = nfs_match_client(cl_init); 416 if (clp) { 417 spin_unlock(&nn->nfs_client_lock); 418 if (new) 419 new->rpc_ops->free_client(new); 420 if (IS_ERR(clp)) 421 return clp; 422 return nfs_found_client(cl_init, clp); 423 } 424 if (new) { 425 list_add_tail(&new->cl_share_link, 426 &nn->nfs_client_list); 427 spin_unlock(&nn->nfs_client_lock); 428 new->cl_flags = cl_init->init_flags; 429 return rpc_ops->init_client(new, cl_init); 430 } 431 432 spin_unlock(&nn->nfs_client_lock); 433 434 new = rpc_ops->alloc_client(cl_init); 435 } while (!IS_ERR(new)); 436 437 return new; 438 } 439 EXPORT_SYMBOL_GPL(nfs_get_client); 440 441 /* 442 * Mark a server as ready or failed 443 */ 444 void nfs_mark_client_ready(struct nfs_client *clp, int state) 445 { 446 smp_wmb(); 447 clp->cl_cons_state = state; 448 wake_up_all(&nfs_client_active_wq); 449 } 450 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 451 452 /* 453 * Initialise the timeout values for a connection 454 */ 455 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 456 int timeo, int retrans) 457 { 458 to->to_initval = timeo * HZ / 10; 459 to->to_retries = retrans; 460 461 switch (proto) { 462 case XPRT_TRANSPORT_TCP: 463 case XPRT_TRANSPORT_RDMA: 464 if (retrans == NFS_UNSPEC_RETRANS) 465 to->to_retries = NFS_DEF_TCP_RETRANS; 466 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 467 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 468 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 469 to->to_initval = NFS_MAX_TCP_TIMEOUT; 470 to->to_increment = to->to_initval; 471 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 472 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 473 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 474 if (to->to_maxval < to->to_initval) 475 to->to_maxval = to->to_initval; 476 to->to_exponential = 0; 477 break; 478 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 479 case XPRT_TRANSPORT_UDP: 480 if (retrans == NFS_UNSPEC_RETRANS) 481 to->to_retries = NFS_DEF_UDP_RETRANS; 482 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 483 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 484 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 485 to->to_initval = NFS_MAX_UDP_TIMEOUT; 486 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 487 to->to_exponential = 1; 488 break; 489 #endif 490 default: 491 BUG(); 492 } 493 } 494 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 495 496 /* 497 * Create an RPC client handle 498 */ 499 int nfs_create_rpc_client(struct nfs_client *clp, 500 const struct nfs_client_initdata *cl_init, 501 rpc_authflavor_t flavor) 502 { 503 struct rpc_clnt *clnt = NULL; 504 struct rpc_create_args args = { 505 .net = clp->cl_net, 506 .protocol = clp->cl_proto, 507 .nconnect = clp->cl_nconnect, 508 .address = (struct sockaddr *)&clp->cl_addr, 509 .addrsize = clp->cl_addrlen, 510 .timeout = cl_init->timeparms, 511 .servername = clp->cl_hostname, 512 .nodename = cl_init->nodename, 513 .program = &nfs_program, 514 .version = clp->rpc_ops->version, 515 .authflavor = flavor, 516 .cred = cl_init->cred, 517 }; 518 519 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 520 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 521 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 522 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 523 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 524 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 525 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 527 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 528 args.flags |= RPC_CLNT_CREATE_NOPING; 529 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 530 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 531 532 if (!IS_ERR(clp->cl_rpcclient)) 533 return 0; 534 535 clnt = rpc_create(&args); 536 if (IS_ERR(clnt)) { 537 dprintk("%s: cannot create RPC client. Error = %ld\n", 538 __func__, PTR_ERR(clnt)); 539 return PTR_ERR(clnt); 540 } 541 542 clnt->cl_principal = clp->cl_principal; 543 clp->cl_rpcclient = clnt; 544 return 0; 545 } 546 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 547 548 /* 549 * Version 2 or 3 client destruction 550 */ 551 static void nfs_destroy_server(struct nfs_server *server) 552 { 553 if (server->nlm_host) 554 nlmclnt_done(server->nlm_host); 555 } 556 557 /* 558 * Version 2 or 3 lockd setup 559 */ 560 static int nfs_start_lockd(struct nfs_server *server) 561 { 562 struct nlm_host *host; 563 struct nfs_client *clp = server->nfs_client; 564 struct nlmclnt_initdata nlm_init = { 565 .hostname = clp->cl_hostname, 566 .address = (struct sockaddr *)&clp->cl_addr, 567 .addrlen = clp->cl_addrlen, 568 .nfs_version = clp->rpc_ops->version, 569 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 570 1 : 0, 571 .net = clp->cl_net, 572 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 573 .cred = current_cred(), 574 }; 575 576 if (nlm_init.nfs_version > 3) 577 return 0; 578 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 579 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 580 return 0; 581 582 switch (clp->cl_proto) { 583 default: 584 nlm_init.protocol = IPPROTO_TCP; 585 break; 586 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 587 case XPRT_TRANSPORT_UDP: 588 nlm_init.protocol = IPPROTO_UDP; 589 #endif 590 } 591 592 host = nlmclnt_init(&nlm_init); 593 if (IS_ERR(host)) 594 return PTR_ERR(host); 595 596 server->nlm_host = host; 597 server->destroy = nfs_destroy_server; 598 return 0; 599 } 600 601 /* 602 * Create a general RPC client 603 */ 604 int nfs_init_server_rpcclient(struct nfs_server *server, 605 const struct rpc_timeout *timeo, 606 rpc_authflavor_t pseudoflavour) 607 { 608 struct nfs_client *clp = server->nfs_client; 609 610 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 611 pseudoflavour); 612 if (IS_ERR(server->client)) { 613 dprintk("%s: couldn't create rpc_client!\n", __func__); 614 return PTR_ERR(server->client); 615 } 616 617 memcpy(&server->client->cl_timeout_default, 618 timeo, 619 sizeof(server->client->cl_timeout_default)); 620 server->client->cl_timeout = &server->client->cl_timeout_default; 621 server->client->cl_softrtry = 0; 622 if (server->flags & NFS_MOUNT_SOFTERR) 623 server->client->cl_softerr = 1; 624 if (server->flags & NFS_MOUNT_SOFT) 625 server->client->cl_softrtry = 1; 626 627 return 0; 628 } 629 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 630 631 /** 632 * nfs_init_client - Initialise an NFS2 or NFS3 client 633 * 634 * @clp: nfs_client to initialise 635 * @cl_init: Initialisation parameters 636 * 637 * Returns pointer to an NFS client, or an ERR_PTR value. 638 */ 639 struct nfs_client *nfs_init_client(struct nfs_client *clp, 640 const struct nfs_client_initdata *cl_init) 641 { 642 int error; 643 644 /* the client is already initialised */ 645 if (clp->cl_cons_state == NFS_CS_READY) 646 return clp; 647 648 /* 649 * Create a client RPC handle for doing FSSTAT with UNIX auth only 650 * - RFC 2623, sec 2.3.2 651 */ 652 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 653 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 654 if (error < 0) { 655 nfs_put_client(clp); 656 clp = ERR_PTR(error); 657 } 658 return clp; 659 } 660 EXPORT_SYMBOL_GPL(nfs_init_client); 661 662 /* 663 * Create a version 2 or 3 client 664 */ 665 static int nfs_init_server(struct nfs_server *server, 666 const struct fs_context *fc) 667 { 668 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 669 struct rpc_timeout timeparms; 670 struct nfs_client_initdata cl_init = { 671 .hostname = ctx->nfs_server.hostname, 672 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 673 .addrlen = ctx->nfs_server.addrlen, 674 .nfs_mod = ctx->nfs_mod, 675 .proto = ctx->nfs_server.protocol, 676 .net = fc->net_ns, 677 .timeparms = &timeparms, 678 .cred = server->cred, 679 .nconnect = ctx->nfs_server.nconnect, 680 .init_flags = (1UL << NFS_CS_REUSEPORT), 681 }; 682 struct nfs_client *clp; 683 int error; 684 685 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 686 ctx->timeo, ctx->retrans); 687 if (ctx->flags & NFS_MOUNT_NORESVPORT) 688 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 689 690 /* Allocate or find a client reference we can use */ 691 clp = nfs_get_client(&cl_init); 692 if (IS_ERR(clp)) 693 return PTR_ERR(clp); 694 695 server->nfs_client = clp; 696 697 /* Initialise the client representation from the mount data */ 698 server->flags = ctx->flags; 699 server->options = ctx->options; 700 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 701 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 702 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 703 704 if (ctx->rsize) 705 server->rsize = nfs_block_size(ctx->rsize, NULL); 706 if (ctx->wsize) 707 server->wsize = nfs_block_size(ctx->wsize, NULL); 708 709 server->acregmin = ctx->acregmin * HZ; 710 server->acregmax = ctx->acregmax * HZ; 711 server->acdirmin = ctx->acdirmin * HZ; 712 server->acdirmax = ctx->acdirmax * HZ; 713 714 /* Start lockd here, before we might error out */ 715 error = nfs_start_lockd(server); 716 if (error < 0) 717 goto error; 718 719 server->port = ctx->nfs_server.port; 720 server->auth_info = ctx->auth_info; 721 722 error = nfs_init_server_rpcclient(server, &timeparms, 723 ctx->selected_flavor); 724 if (error < 0) 725 goto error; 726 727 /* Preserve the values of mount_server-related mount options */ 728 if (ctx->mount_server.addrlen) { 729 memcpy(&server->mountd_address, &ctx->mount_server.address, 730 ctx->mount_server.addrlen); 731 server->mountd_addrlen = ctx->mount_server.addrlen; 732 } 733 server->mountd_version = ctx->mount_server.version; 734 server->mountd_port = ctx->mount_server.port; 735 server->mountd_protocol = ctx->mount_server.protocol; 736 737 server->namelen = ctx->namlen; 738 return 0; 739 740 error: 741 server->nfs_client = NULL; 742 nfs_put_client(clp); 743 return error; 744 } 745 746 /* 747 * Load up the server record from information gained in an fsinfo record 748 */ 749 static void nfs_server_set_fsinfo(struct nfs_server *server, 750 struct nfs_fsinfo *fsinfo) 751 { 752 unsigned long max_rpc_payload; 753 754 /* Work out a lot of parameters */ 755 if (server->rsize == 0) 756 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 757 if (server->wsize == 0) 758 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 759 760 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 761 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 762 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 763 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 764 765 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 766 if (server->rsize > max_rpc_payload) 767 server->rsize = max_rpc_payload; 768 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 769 server->rsize = NFS_MAX_FILE_IO_SIZE; 770 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 771 772 if (server->wsize > max_rpc_payload) 773 server->wsize = max_rpc_payload; 774 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 775 server->wsize = NFS_MAX_FILE_IO_SIZE; 776 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 777 778 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 779 780 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 781 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 782 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 783 if (server->dtsize > server->rsize) 784 server->dtsize = server->rsize; 785 786 if (server->flags & NFS_MOUNT_NOAC) { 787 server->acregmin = server->acregmax = 0; 788 server->acdirmin = server->acdirmax = 0; 789 } 790 791 server->maxfilesize = fsinfo->maxfilesize; 792 793 server->time_delta = fsinfo->time_delta; 794 795 server->clone_blksize = fsinfo->clone_blksize; 796 /* We're airborne Set socket buffersize */ 797 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 798 } 799 800 /* 801 * Probe filesystem information, including the FSID on v2/v3 802 */ 803 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 804 { 805 struct nfs_fsinfo fsinfo; 806 struct nfs_client *clp = server->nfs_client; 807 int error; 808 809 if (clp->rpc_ops->set_capabilities != NULL) { 810 error = clp->rpc_ops->set_capabilities(server, mntfh); 811 if (error < 0) 812 return error; 813 } 814 815 fsinfo.fattr = fattr; 816 fsinfo.nlayouttypes = 0; 817 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 818 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 819 if (error < 0) 820 return error; 821 822 nfs_server_set_fsinfo(server, &fsinfo); 823 824 /* Get some general file system info */ 825 if (server->namelen == 0) { 826 struct nfs_pathconf pathinfo; 827 828 pathinfo.fattr = fattr; 829 nfs_fattr_init(fattr); 830 831 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 832 server->namelen = pathinfo.max_namelen; 833 } 834 835 return 0; 836 } 837 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 838 839 /* 840 * Copy useful information when duplicating a server record 841 */ 842 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 843 { 844 target->flags = source->flags; 845 target->rsize = source->rsize; 846 target->wsize = source->wsize; 847 target->acregmin = source->acregmin; 848 target->acregmax = source->acregmax; 849 target->acdirmin = source->acdirmin; 850 target->acdirmax = source->acdirmax; 851 target->caps = source->caps; 852 target->options = source->options; 853 target->auth_info = source->auth_info; 854 target->port = source->port; 855 } 856 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 857 858 void nfs_server_insert_lists(struct nfs_server *server) 859 { 860 struct nfs_client *clp = server->nfs_client; 861 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 862 863 spin_lock(&nn->nfs_client_lock); 864 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 865 list_add_tail(&server->master_link, &nn->nfs_volume_list); 866 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 867 spin_unlock(&nn->nfs_client_lock); 868 869 } 870 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 871 872 void nfs_server_remove_lists(struct nfs_server *server) 873 { 874 struct nfs_client *clp = server->nfs_client; 875 struct nfs_net *nn; 876 877 if (clp == NULL) 878 return; 879 nn = net_generic(clp->cl_net, nfs_net_id); 880 spin_lock(&nn->nfs_client_lock); 881 list_del_rcu(&server->client_link); 882 if (list_empty(&clp->cl_superblocks)) 883 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 884 list_del(&server->master_link); 885 spin_unlock(&nn->nfs_client_lock); 886 887 synchronize_rcu(); 888 } 889 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 890 891 /* 892 * Allocate and initialise a server record 893 */ 894 struct nfs_server *nfs_alloc_server(void) 895 { 896 struct nfs_server *server; 897 898 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 899 if (!server) 900 return NULL; 901 902 server->client = server->client_acl = ERR_PTR(-EINVAL); 903 904 /* Zero out the NFS state stuff */ 905 INIT_LIST_HEAD(&server->client_link); 906 INIT_LIST_HEAD(&server->master_link); 907 INIT_LIST_HEAD(&server->delegations); 908 INIT_LIST_HEAD(&server->layouts); 909 INIT_LIST_HEAD(&server->state_owners_lru); 910 INIT_LIST_HEAD(&server->ss_copies); 911 912 atomic_set(&server->active, 0); 913 914 server->io_stats = nfs_alloc_iostats(); 915 if (!server->io_stats) { 916 kfree(server); 917 return NULL; 918 } 919 920 ida_init(&server->openowner_id); 921 ida_init(&server->lockowner_id); 922 pnfs_init_server(server); 923 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 924 925 return server; 926 } 927 EXPORT_SYMBOL_GPL(nfs_alloc_server); 928 929 /* 930 * Free up a server record 931 */ 932 void nfs_free_server(struct nfs_server *server) 933 { 934 nfs_server_remove_lists(server); 935 936 if (server->destroy != NULL) 937 server->destroy(server); 938 939 if (!IS_ERR(server->client_acl)) 940 rpc_shutdown_client(server->client_acl); 941 if (!IS_ERR(server->client)) 942 rpc_shutdown_client(server->client); 943 944 nfs_put_client(server->nfs_client); 945 946 ida_destroy(&server->lockowner_id); 947 ida_destroy(&server->openowner_id); 948 nfs_free_iostats(server->io_stats); 949 put_cred(server->cred); 950 kfree(server); 951 nfs_release_automount_timer(); 952 } 953 EXPORT_SYMBOL_GPL(nfs_free_server); 954 955 /* 956 * Create a version 2 or 3 volume record 957 * - keyed on server and FSID 958 */ 959 struct nfs_server *nfs_create_server(struct fs_context *fc) 960 { 961 struct nfs_fs_context *ctx = nfs_fc2context(fc); 962 struct nfs_server *server; 963 struct nfs_fattr *fattr; 964 int error; 965 966 server = nfs_alloc_server(); 967 if (!server) 968 return ERR_PTR(-ENOMEM); 969 970 server->cred = get_cred(current_cred()); 971 972 error = -ENOMEM; 973 fattr = nfs_alloc_fattr(); 974 if (fattr == NULL) 975 goto error; 976 977 /* Get a client representation */ 978 error = nfs_init_server(server, fc); 979 if (error < 0) 980 goto error; 981 982 /* Probe the root fh to retrieve its FSID */ 983 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 984 if (error < 0) 985 goto error; 986 if (server->nfs_client->rpc_ops->version == 3) { 987 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 988 server->namelen = NFS3_MAXNAMLEN; 989 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 990 server->caps |= NFS_CAP_READDIRPLUS; 991 } else { 992 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 993 server->namelen = NFS2_MAXNAMLEN; 994 } 995 996 if (!(fattr->valid & NFS_ATTR_FATTR)) { 997 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 998 fattr, NULL, NULL); 999 if (error < 0) { 1000 dprintk("nfs_create_server: getattr error = %d\n", -error); 1001 goto error; 1002 } 1003 } 1004 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1005 1006 dprintk("Server FSID: %llx:%llx\n", 1007 (unsigned long long) server->fsid.major, 1008 (unsigned long long) server->fsid.minor); 1009 1010 nfs_server_insert_lists(server); 1011 server->mount_time = jiffies; 1012 nfs_free_fattr(fattr); 1013 return server; 1014 1015 error: 1016 nfs_free_fattr(fattr); 1017 nfs_free_server(server); 1018 return ERR_PTR(error); 1019 } 1020 EXPORT_SYMBOL_GPL(nfs_create_server); 1021 1022 /* 1023 * Clone an NFS2, NFS3 or NFS4 server record 1024 */ 1025 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1026 struct nfs_fh *fh, 1027 struct nfs_fattr *fattr, 1028 rpc_authflavor_t flavor) 1029 { 1030 struct nfs_server *server; 1031 struct nfs_fattr *fattr_fsinfo; 1032 int error; 1033 1034 server = nfs_alloc_server(); 1035 if (!server) 1036 return ERR_PTR(-ENOMEM); 1037 1038 server->cred = get_cred(source->cred); 1039 1040 error = -ENOMEM; 1041 fattr_fsinfo = nfs_alloc_fattr(); 1042 if (fattr_fsinfo == NULL) 1043 goto out_free_server; 1044 1045 /* Copy data from the source */ 1046 server->nfs_client = source->nfs_client; 1047 server->destroy = source->destroy; 1048 refcount_inc(&server->nfs_client->cl_count); 1049 nfs_server_copy_userdata(server, source); 1050 1051 server->fsid = fattr->fsid; 1052 1053 error = nfs_init_server_rpcclient(server, 1054 source->client->cl_timeout, 1055 flavor); 1056 if (error < 0) 1057 goto out_free_server; 1058 1059 /* probe the filesystem info for this server filesystem */ 1060 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1061 if (error < 0) 1062 goto out_free_server; 1063 1064 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1065 server->namelen = NFS4_MAXNAMLEN; 1066 1067 error = nfs_start_lockd(server); 1068 if (error < 0) 1069 goto out_free_server; 1070 1071 nfs_server_insert_lists(server); 1072 server->mount_time = jiffies; 1073 1074 nfs_free_fattr(fattr_fsinfo); 1075 return server; 1076 1077 out_free_server: 1078 nfs_free_fattr(fattr_fsinfo); 1079 nfs_free_server(server); 1080 return ERR_PTR(error); 1081 } 1082 EXPORT_SYMBOL_GPL(nfs_clone_server); 1083 1084 void nfs_clients_init(struct net *net) 1085 { 1086 struct nfs_net *nn = net_generic(net, nfs_net_id); 1087 1088 INIT_LIST_HEAD(&nn->nfs_client_list); 1089 INIT_LIST_HEAD(&nn->nfs_volume_list); 1090 #if IS_ENABLED(CONFIG_NFS_V4) 1091 idr_init(&nn->cb_ident_idr); 1092 #endif 1093 spin_lock_init(&nn->nfs_client_lock); 1094 nn->boot_time = ktime_get_real(); 1095 1096 nfs_netns_sysfs_setup(nn, net); 1097 } 1098 1099 void nfs_clients_exit(struct net *net) 1100 { 1101 struct nfs_net *nn = net_generic(net, nfs_net_id); 1102 1103 nfs_netns_sysfs_destroy(nn); 1104 nfs_cleanup_cb_ident_idr(net); 1105 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1106 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1107 } 1108 1109 #ifdef CONFIG_PROC_FS 1110 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1111 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1112 static void nfs_server_list_stop(struct seq_file *p, void *v); 1113 static int nfs_server_list_show(struct seq_file *m, void *v); 1114 1115 static const struct seq_operations nfs_server_list_ops = { 1116 .start = nfs_server_list_start, 1117 .next = nfs_server_list_next, 1118 .stop = nfs_server_list_stop, 1119 .show = nfs_server_list_show, 1120 }; 1121 1122 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1123 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1124 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1125 static int nfs_volume_list_show(struct seq_file *m, void *v); 1126 1127 static const struct seq_operations nfs_volume_list_ops = { 1128 .start = nfs_volume_list_start, 1129 .next = nfs_volume_list_next, 1130 .stop = nfs_volume_list_stop, 1131 .show = nfs_volume_list_show, 1132 }; 1133 1134 /* 1135 * set up the iterator to start reading from the server list and return the first item 1136 */ 1137 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1138 __acquires(&nn->nfs_client_lock) 1139 { 1140 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1141 1142 /* lock the list against modification */ 1143 spin_lock(&nn->nfs_client_lock); 1144 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1145 } 1146 1147 /* 1148 * move to next server 1149 */ 1150 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1151 { 1152 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1153 1154 return seq_list_next(v, &nn->nfs_client_list, pos); 1155 } 1156 1157 /* 1158 * clean up after reading from the transports list 1159 */ 1160 static void nfs_server_list_stop(struct seq_file *p, void *v) 1161 __releases(&nn->nfs_client_lock) 1162 { 1163 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1164 1165 spin_unlock(&nn->nfs_client_lock); 1166 } 1167 1168 /* 1169 * display a header line followed by a load of call lines 1170 */ 1171 static int nfs_server_list_show(struct seq_file *m, void *v) 1172 { 1173 struct nfs_client *clp; 1174 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1175 1176 /* display header on line 1 */ 1177 if (v == &nn->nfs_client_list) { 1178 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1179 return 0; 1180 } 1181 1182 /* display one transport per line on subsequent lines */ 1183 clp = list_entry(v, struct nfs_client, cl_share_link); 1184 1185 /* Check if the client is initialized */ 1186 if (clp->cl_cons_state != NFS_CS_READY) 1187 return 0; 1188 1189 rcu_read_lock(); 1190 seq_printf(m, "v%u %s %s %3d %s\n", 1191 clp->rpc_ops->version, 1192 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1193 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1194 refcount_read(&clp->cl_count), 1195 clp->cl_hostname); 1196 rcu_read_unlock(); 1197 1198 return 0; 1199 } 1200 1201 /* 1202 * set up the iterator to start reading from the volume list and return the first item 1203 */ 1204 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1205 __acquires(&nn->nfs_client_lock) 1206 { 1207 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1208 1209 /* lock the list against modification */ 1210 spin_lock(&nn->nfs_client_lock); 1211 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1212 } 1213 1214 /* 1215 * move to next volume 1216 */ 1217 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1218 { 1219 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1220 1221 return seq_list_next(v, &nn->nfs_volume_list, pos); 1222 } 1223 1224 /* 1225 * clean up after reading from the transports list 1226 */ 1227 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1228 __releases(&nn->nfs_client_lock) 1229 { 1230 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1231 1232 spin_unlock(&nn->nfs_client_lock); 1233 } 1234 1235 /* 1236 * display a header line followed by a load of call lines 1237 */ 1238 static int nfs_volume_list_show(struct seq_file *m, void *v) 1239 { 1240 struct nfs_server *server; 1241 struct nfs_client *clp; 1242 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1243 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1244 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1245 1246 /* display header on line 1 */ 1247 if (v == &nn->nfs_volume_list) { 1248 seq_puts(m, "NV SERVER PORT DEV FSID" 1249 " FSC\n"); 1250 return 0; 1251 } 1252 /* display one transport per line on subsequent lines */ 1253 server = list_entry(v, struct nfs_server, master_link); 1254 clp = server->nfs_client; 1255 1256 snprintf(dev, sizeof(dev), "%u:%u", 1257 MAJOR(server->s_dev), MINOR(server->s_dev)); 1258 1259 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1260 (unsigned long long) server->fsid.major, 1261 (unsigned long long) server->fsid.minor); 1262 1263 rcu_read_lock(); 1264 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1265 clp->rpc_ops->version, 1266 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1267 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1268 dev, 1269 fsid, 1270 nfs_server_fscache_state(server)); 1271 rcu_read_unlock(); 1272 1273 return 0; 1274 } 1275 1276 int nfs_fs_proc_net_init(struct net *net) 1277 { 1278 struct nfs_net *nn = net_generic(net, nfs_net_id); 1279 struct proc_dir_entry *p; 1280 1281 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1282 if (!nn->proc_nfsfs) 1283 goto error_0; 1284 1285 /* a file of servers with which we're dealing */ 1286 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1287 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1288 if (!p) 1289 goto error_1; 1290 1291 /* a file of volumes that we have mounted */ 1292 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1293 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1294 if (!p) 1295 goto error_1; 1296 return 0; 1297 1298 error_1: 1299 remove_proc_subtree("nfsfs", net->proc_net); 1300 error_0: 1301 return -ENOMEM; 1302 } 1303 1304 void nfs_fs_proc_net_exit(struct net *net) 1305 { 1306 remove_proc_subtree("nfsfs", net->proc_net); 1307 } 1308 1309 /* 1310 * initialise the /proc/fs/nfsfs/ directory 1311 */ 1312 int __init nfs_fs_proc_init(void) 1313 { 1314 if (!proc_mkdir("fs/nfsfs", NULL)) 1315 goto error_0; 1316 1317 /* a file of servers with which we're dealing */ 1318 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1319 goto error_1; 1320 1321 /* a file of volumes that we have mounted */ 1322 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1323 goto error_1; 1324 1325 return 0; 1326 error_1: 1327 remove_proc_subtree("fs/nfsfs", NULL); 1328 error_0: 1329 return -ENOMEM; 1330 } 1331 1332 /* 1333 * clean up the /proc/fs/nfsfs/ directory 1334 */ 1335 void nfs_fs_proc_exit(void) 1336 { 1337 remove_proc_subtree("fs/nfsfs", NULL); 1338 } 1339 1340 #endif /* CONFIG_PROC_FS */ 1341