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#include "nfs42.h" 54 55#define NFSDBG_FACILITY NFSDBG_CLIENT 56 57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58static DEFINE_SPINLOCK(nfs_version_lock); 59static DEFINE_MUTEX(nfs_version_mutex); 60static LIST_HEAD(nfs_versions); 61 62/* 63 * RPC cruft for NFS 64 */ 65static const struct rpc_version *nfs_version[5] = { 66 [2] = NULL, 67 [3] = NULL, 68 [4] = NULL, 69}; 70 71const struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .pipe_dir_name = NFS_PIPE_DIRNAME, 77}; 78 79struct rpc_stat nfs_rpcstat = { 80 .program = &nfs_program 81}; 82 83static 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 99struct 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 115void put_nfs_version(struct nfs_subversion *nfs) 116{ 117 module_put(nfs->owner); 118} 119 120void 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} 129EXPORT_SYMBOL_GPL(register_nfs_version); 130 131void 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} 140EXPORT_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 */ 148struct 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_flags = cl_init->init_flags; 180 clp->cl_proto = cl_init->proto; 181 clp->cl_nconnect = cl_init->nconnect; 182 clp->cl_net = get_net(cl_init->net); 183 184 clp->cl_principal = "*"; 185 nfs_fscache_get_client_cookie(clp); 186 187 return clp; 188 189error_cleanup: 190 put_nfs_version(clp->cl_nfs_mod); 191error_dealloc: 192 kfree(clp); 193error_0: 194 return ERR_PTR(err); 195} 196EXPORT_SYMBOL_GPL(nfs_alloc_client); 197 198#if IS_ENABLED(CONFIG_NFS_V4) 199static void nfs_cleanup_cb_ident_idr(struct net *net) 200{ 201 struct nfs_net *nn = net_generic(net, nfs_net_id); 202 203 idr_destroy(&nn->cb_ident_idr); 204} 205 206/* nfs_client_lock held */ 207static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 208{ 209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 210 211 if (clp->cl_cb_ident) 212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 213} 214 215static void pnfs_init_server(struct nfs_server *server) 216{ 217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 218} 219 220#else 221static void nfs_cleanup_cb_ident_idr(struct net *net) 222{ 223} 224 225static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 226{ 227} 228 229static void pnfs_init_server(struct nfs_server *server) 230{ 231} 232 233#endif /* CONFIG_NFS_V4 */ 234 235/* 236 * Destroy a shared client record 237 */ 238void nfs_free_client(struct nfs_client *clp) 239{ 240 nfs_fscache_release_client_cookie(clp); 241 242 /* -EIO all pending I/O */ 243 if (!IS_ERR(clp->cl_rpcclient)) 244 rpc_shutdown_client(clp->cl_rpcclient); 245 246 put_net(clp->cl_net); 247 put_nfs_version(clp->cl_nfs_mod); 248 kfree(clp->cl_hostname); 249 kfree(clp->cl_acceptor); 250 kfree(clp); 251} 252EXPORT_SYMBOL_GPL(nfs_free_client); 253 254/* 255 * Release a reference to a shared client record 256 */ 257void nfs_put_client(struct nfs_client *clp) 258{ 259 struct nfs_net *nn; 260 261 if (!clp) 262 return; 263 264 nn = net_generic(clp->cl_net, nfs_net_id); 265 266 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 267 list_del(&clp->cl_share_link); 268 nfs_cb_idr_remove_locked(clp); 269 spin_unlock(&nn->nfs_client_lock); 270 271 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 272 273 clp->rpc_ops->free_client(clp); 274 } 275} 276EXPORT_SYMBOL_GPL(nfs_put_client); 277 278/* 279 * Find an nfs_client on the list that matches the initialisation data 280 * that is supplied. 281 */ 282static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 283{ 284 struct nfs_client *clp; 285 const struct sockaddr *sap = data->addr; 286 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 287 int error; 288 289again: 290 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 291 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 292 /* Don't match clients that failed to initialise properly */ 293 if (clp->cl_cons_state < 0) 294 continue; 295 296 /* If a client is still initializing then we need to wait */ 297 if (clp->cl_cons_state > NFS_CS_READY) { 298 refcount_inc(&clp->cl_count); 299 spin_unlock(&nn->nfs_client_lock); 300 error = nfs_wait_client_init_complete(clp); 301 nfs_put_client(clp); 302 spin_lock(&nn->nfs_client_lock); 303 if (error < 0) 304 return ERR_PTR(error); 305 goto again; 306 } 307 308 /* Different NFS versions cannot share the same nfs_client */ 309 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 310 continue; 311 312 if (clp->cl_proto != data->proto) 313 continue; 314 /* Match nfsv4 minorversion */ 315 if (clp->cl_minorversion != data->minorversion) 316 continue; 317 318 /* Match request for a dedicated DS */ 319 if (test_bit(NFS_CS_DS, &data->init_flags) != 320 test_bit(NFS_CS_DS, &clp->cl_flags)) 321 continue; 322 323 /* Match the full socket address */ 324 if (!rpc_cmp_addr_port(sap, clap)) 325 /* Match all xprt_switch full socket addresses */ 326 if (IS_ERR(clp->cl_rpcclient) || 327 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 328 sap)) 329 continue; 330 331 refcount_inc(&clp->cl_count); 332 return clp; 333 } 334 return NULL; 335} 336 337/* 338 * Return true if @clp is done initializing, false if still working on it. 339 * 340 * Use nfs_client_init_status to check if it was successful. 341 */ 342bool nfs_client_init_is_complete(const struct nfs_client *clp) 343{ 344 return clp->cl_cons_state <= NFS_CS_READY; 345} 346EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 347 348/* 349 * Return 0 if @clp was successfully initialized, -errno otherwise. 350 * 351 * This must be called *after* nfs_client_init_is_complete() returns true, 352 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 353 */ 354int nfs_client_init_status(const struct nfs_client *clp) 355{ 356 /* called without checking nfs_client_init_is_complete */ 357 if (clp->cl_cons_state > NFS_CS_READY) { 358 WARN_ON_ONCE(1); 359 return -EINVAL; 360 } 361 return clp->cl_cons_state; 362} 363EXPORT_SYMBOL_GPL(nfs_client_init_status); 364 365int nfs_wait_client_init_complete(const struct nfs_client *clp) 366{ 367 return wait_event_killable(nfs_client_active_wq, 368 nfs_client_init_is_complete(clp)); 369} 370EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 371 372/* 373 * Found an existing client. Make sure it's ready before returning. 374 */ 375static struct nfs_client * 376nfs_found_client(const struct nfs_client_initdata *cl_init, 377 struct nfs_client *clp) 378{ 379 int error; 380 381 error = nfs_wait_client_init_complete(clp); 382 if (error < 0) { 383 nfs_put_client(clp); 384 return ERR_PTR(-ERESTARTSYS); 385 } 386 387 if (clp->cl_cons_state < NFS_CS_READY) { 388 error = clp->cl_cons_state; 389 nfs_put_client(clp); 390 return ERR_PTR(error); 391 } 392 393 smp_rmb(); 394 return clp; 395} 396 397/* 398 * Look up a client by IP address and protocol version 399 * - creates a new record if one doesn't yet exist 400 */ 401struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 402{ 403 struct nfs_client *clp, *new = NULL; 404 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 405 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 406 407 if (cl_init->hostname == NULL) { 408 WARN_ON(1); 409 return ERR_PTR(-EINVAL); 410 } 411 412 /* see if the client already exists */ 413 do { 414 spin_lock(&nn->nfs_client_lock); 415 416 clp = nfs_match_client(cl_init); 417 if (clp) { 418 spin_unlock(&nn->nfs_client_lock); 419 if (new) 420 new->rpc_ops->free_client(new); 421 if (IS_ERR(clp)) 422 return clp; 423 return nfs_found_client(cl_init, clp); 424 } 425 if (new) { 426 list_add_tail(&new->cl_share_link, 427 &nn->nfs_client_list); 428 spin_unlock(&nn->nfs_client_lock); 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} 439EXPORT_SYMBOL_GPL(nfs_get_client); 440 441/* 442 * Mark a server as ready or failed 443 */ 444void 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} 450EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 451 452/* 453 * Initialise the timeout values for a connection 454 */ 455void 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} 494EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 495 496/* 497 * Create an RPC client handle 498 */ 499int nfs_create_rpc_client(struct nfs_client *clp, 500 const struct nfs_client_initdata *cl_init, 501 rpc_authflavor_t flavor) 502{ 503 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 504 struct rpc_clnt *clnt = NULL; 505 struct rpc_create_args args = { 506 .net = clp->cl_net, 507 .protocol = clp->cl_proto, 508 .nconnect = clp->cl_nconnect, 509 .address = (struct sockaddr *)&clp->cl_addr, 510 .addrsize = clp->cl_addrlen, 511 .timeout = cl_init->timeparms, 512 .servername = clp->cl_hostname, 513 .nodename = cl_init->nodename, 514 .program = &nfs_program, 515 .stats = &nn->rpcstats, 516 .version = clp->rpc_ops->version, 517 .authflavor = flavor, 518 .cred = cl_init->cred, 519 }; 520 521 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 522 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 523 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 524 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 525 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 527 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 528 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 529 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 530 args.flags |= RPC_CLNT_CREATE_NOPING; 531 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 532 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 533 534 if (!IS_ERR(clp->cl_rpcclient)) 535 return 0; 536 537 clnt = rpc_create(&args); 538 if (IS_ERR(clnt)) { 539 dprintk("%s: cannot create RPC client. Error = %ld\n", 540 __func__, PTR_ERR(clnt)); 541 return PTR_ERR(clnt); 542 } 543 544 clnt->cl_principal = clp->cl_principal; 545 clp->cl_rpcclient = clnt; 546 return 0; 547} 548EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 549 550/* 551 * Version 2 or 3 client destruction 552 */ 553static void nfs_destroy_server(struct nfs_server *server) 554{ 555 if (server->nlm_host) 556 nlmclnt_done(server->nlm_host); 557} 558 559/* 560 * Version 2 or 3 lockd setup 561 */ 562static int nfs_start_lockd(struct nfs_server *server) 563{ 564 struct nlm_host *host; 565 struct nfs_client *clp = server->nfs_client; 566 struct nlmclnt_initdata nlm_init = { 567 .hostname = clp->cl_hostname, 568 .address = (struct sockaddr *)&clp->cl_addr, 569 .addrlen = clp->cl_addrlen, 570 .nfs_version = clp->rpc_ops->version, 571 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 572 1 : 0, 573 .net = clp->cl_net, 574 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 575 .cred = server->cred, 576 }; 577 578 if (nlm_init.nfs_version > 3) 579 return 0; 580 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 581 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 582 return 0; 583 584 switch (clp->cl_proto) { 585 default: 586 nlm_init.protocol = IPPROTO_TCP; 587 break; 588#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 589 case XPRT_TRANSPORT_UDP: 590 nlm_init.protocol = IPPROTO_UDP; 591#endif 592 } 593 594 host = nlmclnt_init(&nlm_init); 595 if (IS_ERR(host)) 596 return PTR_ERR(host); 597 598 server->nlm_host = host; 599 server->destroy = nfs_destroy_server; 600 return 0; 601} 602 603/* 604 * Create a general RPC client 605 */ 606int nfs_init_server_rpcclient(struct nfs_server *server, 607 const struct rpc_timeout *timeo, 608 rpc_authflavor_t pseudoflavour) 609{ 610 struct nfs_client *clp = server->nfs_client; 611 612 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 613 pseudoflavour); 614 if (IS_ERR(server->client)) { 615 dprintk("%s: couldn't create rpc_client!\n", __func__); 616 return PTR_ERR(server->client); 617 } 618 619 memcpy(&server->client->cl_timeout_default, 620 timeo, 621 sizeof(server->client->cl_timeout_default)); 622 server->client->cl_timeout = &server->client->cl_timeout_default; 623 server->client->cl_softrtry = 0; 624 if (server->flags & NFS_MOUNT_SOFTERR) 625 server->client->cl_softerr = 1; 626 if (server->flags & NFS_MOUNT_SOFT) 627 server->client->cl_softrtry = 1; 628 629 return 0; 630} 631EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 632 633/** 634 * nfs_init_client - Initialise an NFS2 or NFS3 client 635 * 636 * @clp: nfs_client to initialise 637 * @cl_init: Initialisation parameters 638 * 639 * Returns pointer to an NFS client, or an ERR_PTR value. 640 */ 641struct nfs_client *nfs_init_client(struct nfs_client *clp, 642 const struct nfs_client_initdata *cl_init) 643{ 644 int error; 645 646 /* the client is already initialised */ 647 if (clp->cl_cons_state == NFS_CS_READY) 648 return clp; 649 650 /* 651 * Create a client RPC handle for doing FSSTAT with UNIX auth only 652 * - RFC 2623, sec 2.3.2 653 */ 654 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 655 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 656 if (error < 0) { 657 nfs_put_client(clp); 658 clp = ERR_PTR(error); 659 } 660 return clp; 661} 662EXPORT_SYMBOL_GPL(nfs_init_client); 663 664/* 665 * Create a version 2 or 3 client 666 */ 667static int nfs_init_server(struct nfs_server *server, 668 const struct fs_context *fc) 669{ 670 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 671 struct rpc_timeout timeparms; 672 struct nfs_client_initdata cl_init = { 673 .hostname = ctx->nfs_server.hostname, 674 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 675 .addrlen = ctx->nfs_server.addrlen, 676 .nfs_mod = ctx->nfs_mod, 677 .proto = ctx->nfs_server.protocol, 678 .net = fc->net_ns, 679 .timeparms = &timeparms, 680 .cred = server->cred, 681 .nconnect = ctx->nfs_server.nconnect, 682 .init_flags = (1UL << NFS_CS_REUSEPORT), 683 }; 684 struct nfs_client *clp; 685 int error; 686 687 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 688 ctx->timeo, ctx->retrans); 689 if (ctx->flags & NFS_MOUNT_NORESVPORT) 690 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 691 692 /* Allocate or find a client reference we can use */ 693 clp = nfs_get_client(&cl_init); 694 if (IS_ERR(clp)) 695 return PTR_ERR(clp); 696 697 server->nfs_client = clp; 698 699 /* Initialise the client representation from the mount data */ 700 server->flags = ctx->flags; 701 server->options = ctx->options; 702 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 703 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 704 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 705 706 if (ctx->rsize) 707 server->rsize = nfs_block_size(ctx->rsize, NULL); 708 if (ctx->wsize) 709 server->wsize = nfs_block_size(ctx->wsize, NULL); 710 711 server->acregmin = ctx->acregmin * HZ; 712 server->acregmax = ctx->acregmax * HZ; 713 server->acdirmin = ctx->acdirmin * HZ; 714 server->acdirmax = ctx->acdirmax * HZ; 715 716 /* Start lockd here, before we might error out */ 717 error = nfs_start_lockd(server); 718 if (error < 0) 719 goto error; 720 721 server->port = ctx->nfs_server.port; 722 server->auth_info = ctx->auth_info; 723 724 error = nfs_init_server_rpcclient(server, &timeparms, 725 ctx->selected_flavor); 726 if (error < 0) 727 goto error; 728 729 /* Preserve the values of mount_server-related mount options */ 730 if (ctx->mount_server.addrlen) { 731 memcpy(&server->mountd_address, &ctx->mount_server.address, 732 ctx->mount_server.addrlen); 733 server->mountd_addrlen = ctx->mount_server.addrlen; 734 } 735 server->mountd_version = ctx->mount_server.version; 736 server->mountd_port = ctx->mount_server.port; 737 server->mountd_protocol = ctx->mount_server.protocol; 738 739 server->namelen = ctx->namlen; 740 return 0; 741 742error: 743 server->nfs_client = NULL; 744 nfs_put_client(clp); 745 return error; 746} 747 748/* 749 * Load up the server record from information gained in an fsinfo record 750 */ 751static void nfs_server_set_fsinfo(struct nfs_server *server, 752 struct nfs_fsinfo *fsinfo) 753{ 754 unsigned long max_rpc_payload, raw_max_rpc_payload; 755 756 /* Work out a lot of parameters */ 757 if (server->rsize == 0) 758 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 759 if (server->wsize == 0) 760 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 761 762 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 763 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 764 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 765 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 766 767 raw_max_rpc_payload = rpc_max_payload(server->client); 768 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 769 770 if (server->rsize > max_rpc_payload) 771 server->rsize = max_rpc_payload; 772 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 773 server->rsize = NFS_MAX_FILE_IO_SIZE; 774 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 775 776 if (server->wsize > max_rpc_payload) 777 server->wsize = max_rpc_payload; 778 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 779 server->wsize = NFS_MAX_FILE_IO_SIZE; 780 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 781 782 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 783 784 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 785 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 786 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 787 if (server->dtsize > server->rsize) 788 server->dtsize = server->rsize; 789 790 if (server->flags & NFS_MOUNT_NOAC) { 791 server->acregmin = server->acregmax = 0; 792 server->acdirmin = server->acdirmax = 0; 793 } 794 795 server->maxfilesize = fsinfo->maxfilesize; 796 797 server->time_delta = fsinfo->time_delta; 798 799 server->clone_blksize = fsinfo->clone_blksize; 800 /* We're airborne Set socket buffersize */ 801 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 802 803#ifdef CONFIG_NFS_V4_2 804 /* 805 * Defaults until limited by the session parameters. 806 */ 807 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 808 XATTR_SIZE_MAX); 809 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 810 XATTR_SIZE_MAX); 811 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 812 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 813 814 if (fsinfo->xattr_support) 815 server->caps |= NFS_CAP_XATTR; 816#endif 817} 818 819/* 820 * Probe filesystem information, including the FSID on v2/v3 821 */ 822int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 823{ 824 struct nfs_fsinfo fsinfo; 825 struct nfs_client *clp = server->nfs_client; 826 int error; 827 828 if (clp->rpc_ops->set_capabilities != NULL) { 829 error = clp->rpc_ops->set_capabilities(server, mntfh); 830 if (error < 0) 831 return error; 832 } 833 834 fsinfo.fattr = fattr; 835 fsinfo.nlayouttypes = 0; 836 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 837 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 838 if (error < 0) 839 return error; 840 841 nfs_server_set_fsinfo(server, &fsinfo); 842 843 /* Get some general file system info */ 844 if (server->namelen == 0) { 845 struct nfs_pathconf pathinfo; 846 847 pathinfo.fattr = fattr; 848 nfs_fattr_init(fattr); 849 850 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 851 server->namelen = pathinfo.max_namelen; 852 } 853 854 return 0; 855} 856EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 857 858/* 859 * Copy useful information when duplicating a server record 860 */ 861void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 862{ 863 target->flags = source->flags; 864 target->rsize = source->rsize; 865 target->wsize = source->wsize; 866 target->acregmin = source->acregmin; 867 target->acregmax = source->acregmax; 868 target->acdirmin = source->acdirmin; 869 target->acdirmax = source->acdirmax; 870 target->caps = source->caps; 871 target->options = source->options; 872 target->auth_info = source->auth_info; 873 target->port = source->port; 874} 875EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 876 877void nfs_server_insert_lists(struct nfs_server *server) 878{ 879 struct nfs_client *clp = server->nfs_client; 880 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 881 882 spin_lock(&nn->nfs_client_lock); 883 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 884 list_add_tail(&server->master_link, &nn->nfs_volume_list); 885 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 886 spin_unlock(&nn->nfs_client_lock); 887 888} 889EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 890 891void nfs_server_remove_lists(struct nfs_server *server) 892{ 893 struct nfs_client *clp = server->nfs_client; 894 struct nfs_net *nn; 895 896 if (clp == NULL) 897 return; 898 nn = net_generic(clp->cl_net, nfs_net_id); 899 spin_lock(&nn->nfs_client_lock); 900 list_del_rcu(&server->client_link); 901 if (list_empty(&clp->cl_superblocks)) 902 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 903 list_del(&server->master_link); 904 spin_unlock(&nn->nfs_client_lock); 905 906 synchronize_rcu(); 907} 908EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 909 910/* 911 * Allocate and initialise a server record 912 */ 913struct nfs_server *nfs_alloc_server(void) 914{ 915 struct nfs_server *server; 916 917 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 918 if (!server) 919 return NULL; 920 921 server->client = server->client_acl = ERR_PTR(-EINVAL); 922 923 /* Zero out the NFS state stuff */ 924 INIT_LIST_HEAD(&server->client_link); 925 INIT_LIST_HEAD(&server->master_link); 926 INIT_LIST_HEAD(&server->delegations); 927 INIT_LIST_HEAD(&server->layouts); 928 INIT_LIST_HEAD(&server->state_owners_lru); 929 INIT_LIST_HEAD(&server->ss_copies); 930 931 atomic_set(&server->active, 0); 932 933 server->io_stats = nfs_alloc_iostats(); 934 if (!server->io_stats) { 935 kfree(server); 936 return NULL; 937 } 938 939 ida_init(&server->openowner_id); 940 ida_init(&server->lockowner_id); 941 pnfs_init_server(server); 942 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 943 944 return server; 945} 946EXPORT_SYMBOL_GPL(nfs_alloc_server); 947 948/* 949 * Free up a server record 950 */ 951void nfs_free_server(struct nfs_server *server) 952{ 953 nfs_server_remove_lists(server); 954 955 if (server->destroy != NULL) 956 server->destroy(server); 957 958 if (!IS_ERR(server->client_acl)) 959 rpc_shutdown_client(server->client_acl); 960 if (!IS_ERR(server->client)) 961 rpc_shutdown_client(server->client); 962 963 nfs_put_client(server->nfs_client); 964 965 ida_destroy(&server->lockowner_id); 966 ida_destroy(&server->openowner_id); 967 nfs_free_iostats(server->io_stats); 968 put_cred(server->cred); 969 kfree(server); 970 nfs_release_automount_timer(); 971} 972EXPORT_SYMBOL_GPL(nfs_free_server); 973 974/* 975 * Create a version 2 or 3 volume record 976 * - keyed on server and FSID 977 */ 978struct nfs_server *nfs_create_server(struct fs_context *fc) 979{ 980 struct nfs_fs_context *ctx = nfs_fc2context(fc); 981 struct nfs_server *server; 982 struct nfs_fattr *fattr; 983 int error; 984 985 server = nfs_alloc_server(); 986 if (!server) 987 return ERR_PTR(-ENOMEM); 988 989 server->cred = get_cred(fc->cred); 990 991 error = -ENOMEM; 992 fattr = nfs_alloc_fattr(); 993 if (fattr == NULL) 994 goto error; 995 996 /* Get a client representation */ 997 error = nfs_init_server(server, fc); 998 if (error < 0) 999 goto error; 1000 1001 /* Probe the root fh to retrieve its FSID */ 1002 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1003 if (error < 0) 1004 goto error; 1005 if (server->nfs_client->rpc_ops->version == 3) { 1006 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1007 server->namelen = NFS3_MAXNAMLEN; 1008 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1009 server->caps |= NFS_CAP_READDIRPLUS; 1010 } else { 1011 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1012 server->namelen = NFS2_MAXNAMLEN; 1013 } 1014 1015 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1016 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1017 fattr, NULL, NULL); 1018 if (error < 0) { 1019 dprintk("nfs_create_server: getattr error = %d\n", -error); 1020 goto error; 1021 } 1022 } 1023 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1024 1025 dprintk("Server FSID: %llx:%llx\n", 1026 (unsigned long long) server->fsid.major, 1027 (unsigned long long) server->fsid.minor); 1028 1029 nfs_server_insert_lists(server); 1030 server->mount_time = jiffies; 1031 nfs_free_fattr(fattr); 1032 return server; 1033 1034error: 1035 nfs_free_fattr(fattr); 1036 nfs_free_server(server); 1037 return ERR_PTR(error); 1038} 1039EXPORT_SYMBOL_GPL(nfs_create_server); 1040 1041/* 1042 * Clone an NFS2, NFS3 or NFS4 server record 1043 */ 1044struct nfs_server *nfs_clone_server(struct nfs_server *source, 1045 struct nfs_fh *fh, 1046 struct nfs_fattr *fattr, 1047 rpc_authflavor_t flavor) 1048{ 1049 struct nfs_server *server; 1050 struct nfs_fattr *fattr_fsinfo; 1051 int error; 1052 1053 server = nfs_alloc_server(); 1054 if (!server) 1055 return ERR_PTR(-ENOMEM); 1056 1057 server->cred = get_cred(source->cred); 1058 1059 error = -ENOMEM; 1060 fattr_fsinfo = nfs_alloc_fattr(); 1061 if (fattr_fsinfo == NULL) 1062 goto out_free_server; 1063 1064 /* Copy data from the source */ 1065 server->nfs_client = source->nfs_client; 1066 server->destroy = source->destroy; 1067 refcount_inc(&server->nfs_client->cl_count); 1068 nfs_server_copy_userdata(server, source); 1069 1070 server->fsid = fattr->fsid; 1071 1072 error = nfs_init_server_rpcclient(server, 1073 source->client->cl_timeout, 1074 flavor); 1075 if (error < 0) 1076 goto out_free_server; 1077 1078 /* probe the filesystem info for this server filesystem */ 1079 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1080 if (error < 0) 1081 goto out_free_server; 1082 1083 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1084 server->namelen = NFS4_MAXNAMLEN; 1085 1086 error = nfs_start_lockd(server); 1087 if (error < 0) 1088 goto out_free_server; 1089 1090 nfs_server_insert_lists(server); 1091 server->mount_time = jiffies; 1092 1093 nfs_free_fattr(fattr_fsinfo); 1094 return server; 1095 1096out_free_server: 1097 nfs_free_fattr(fattr_fsinfo); 1098 nfs_free_server(server); 1099 return ERR_PTR(error); 1100} 1101EXPORT_SYMBOL_GPL(nfs_clone_server); 1102 1103void nfs_clients_init(struct net *net) 1104{ 1105 struct nfs_net *nn = net_generic(net, nfs_net_id); 1106 1107 INIT_LIST_HEAD(&nn->nfs_client_list); 1108 INIT_LIST_HEAD(&nn->nfs_volume_list); 1109#if IS_ENABLED(CONFIG_NFS_V4) 1110 idr_init(&nn->cb_ident_idr); 1111#endif 1112 spin_lock_init(&nn->nfs_client_lock); 1113 nn->boot_time = ktime_get_real(); 1114 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1115 nn->rpcstats.program = &nfs_program; 1116 1117 nfs_netns_sysfs_setup(nn, net); 1118} 1119 1120void nfs_clients_exit(struct net *net) 1121{ 1122 struct nfs_net *nn = net_generic(net, nfs_net_id); 1123 1124 nfs_netns_sysfs_destroy(nn); 1125 nfs_cleanup_cb_ident_idr(net); 1126 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1127 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1128} 1129 1130#ifdef CONFIG_PROC_FS 1131static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1132static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1133static void nfs_server_list_stop(struct seq_file *p, void *v); 1134static int nfs_server_list_show(struct seq_file *m, void *v); 1135 1136static const struct seq_operations nfs_server_list_ops = { 1137 .start = nfs_server_list_start, 1138 .next = nfs_server_list_next, 1139 .stop = nfs_server_list_stop, 1140 .show = nfs_server_list_show, 1141}; 1142 1143static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1144static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1145static void nfs_volume_list_stop(struct seq_file *p, void *v); 1146static int nfs_volume_list_show(struct seq_file *m, void *v); 1147 1148static const struct seq_operations nfs_volume_list_ops = { 1149 .start = nfs_volume_list_start, 1150 .next = nfs_volume_list_next, 1151 .stop = nfs_volume_list_stop, 1152 .show = nfs_volume_list_show, 1153}; 1154 1155/* 1156 * set up the iterator to start reading from the server list and return the first item 1157 */ 1158static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1159 __acquires(&nn->nfs_client_lock) 1160{ 1161 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1162 1163 /* lock the list against modification */ 1164 spin_lock(&nn->nfs_client_lock); 1165 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1166} 1167 1168/* 1169 * move to next server 1170 */ 1171static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1172{ 1173 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1174 1175 return seq_list_next(v, &nn->nfs_client_list, pos); 1176} 1177 1178/* 1179 * clean up after reading from the transports list 1180 */ 1181static void nfs_server_list_stop(struct seq_file *p, void *v) 1182 __releases(&nn->nfs_client_lock) 1183{ 1184 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1185 1186 spin_unlock(&nn->nfs_client_lock); 1187} 1188 1189/* 1190 * display a header line followed by a load of call lines 1191 */ 1192static int nfs_server_list_show(struct seq_file *m, void *v) 1193{ 1194 struct nfs_client *clp; 1195 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1196 1197 /* display header on line 1 */ 1198 if (v == &nn->nfs_client_list) { 1199 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1200 return 0; 1201 } 1202 1203 /* display one transport per line on subsequent lines */ 1204 clp = list_entry(v, struct nfs_client, cl_share_link); 1205 1206 /* Check if the client is initialized */ 1207 if (clp->cl_cons_state != NFS_CS_READY) 1208 return 0; 1209 1210 rcu_read_lock(); 1211 seq_printf(m, "v%u %s %s %3d %s\n", 1212 clp->rpc_ops->version, 1213 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1214 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1215 refcount_read(&clp->cl_count), 1216 clp->cl_hostname); 1217 rcu_read_unlock(); 1218 1219 return 0; 1220} 1221 1222/* 1223 * set up the iterator to start reading from the volume list and return the first item 1224 */ 1225static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1226 __acquires(&nn->nfs_client_lock) 1227{ 1228 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1229 1230 /* lock the list against modification */ 1231 spin_lock(&nn->nfs_client_lock); 1232 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1233} 1234 1235/* 1236 * move to next volume 1237 */ 1238static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1239{ 1240 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1241 1242 return seq_list_next(v, &nn->nfs_volume_list, pos); 1243} 1244 1245/* 1246 * clean up after reading from the transports list 1247 */ 1248static void nfs_volume_list_stop(struct seq_file *p, void *v) 1249 __releases(&nn->nfs_client_lock) 1250{ 1251 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1252 1253 spin_unlock(&nn->nfs_client_lock); 1254} 1255 1256/* 1257 * display a header line followed by a load of call lines 1258 */ 1259static int nfs_volume_list_show(struct seq_file *m, void *v) 1260{ 1261 struct nfs_server *server; 1262 struct nfs_client *clp; 1263 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1264 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1265 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1266 1267 /* display header on line 1 */ 1268 if (v == &nn->nfs_volume_list) { 1269 seq_puts(m, "NV SERVER PORT DEV FSID" 1270 " FSC\n"); 1271 return 0; 1272 } 1273 /* display one transport per line on subsequent lines */ 1274 server = list_entry(v, struct nfs_server, master_link); 1275 clp = server->nfs_client; 1276 1277 snprintf(dev, sizeof(dev), "%u:%u", 1278 MAJOR(server->s_dev), MINOR(server->s_dev)); 1279 1280 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1281 (unsigned long long) server->fsid.major, 1282 (unsigned long long) server->fsid.minor); 1283 1284 rcu_read_lock(); 1285 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1286 clp->rpc_ops->version, 1287 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1288 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1289 dev, 1290 fsid, 1291 nfs_server_fscache_state(server)); 1292 rcu_read_unlock(); 1293 1294 return 0; 1295} 1296 1297int nfs_fs_proc_net_init(struct net *net) 1298{ 1299 struct nfs_net *nn = net_generic(net, nfs_net_id); 1300 struct proc_dir_entry *p; 1301 1302 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1303 if (!nn->proc_nfsfs) 1304 goto error_0; 1305 1306 /* a file of servers with which we're dealing */ 1307 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1308 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1309 if (!p) 1310 goto error_1; 1311 1312 /* a file of volumes that we have mounted */ 1313 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1314 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1315 if (!p) 1316 goto error_1; 1317 return 0; 1318 1319error_1: 1320 remove_proc_subtree("nfsfs", net->proc_net); 1321error_0: 1322 return -ENOMEM; 1323} 1324 1325void nfs_fs_proc_net_exit(struct net *net) 1326{ 1327 remove_proc_subtree("nfsfs", net->proc_net); 1328} 1329 1330/* 1331 * initialise the /proc/fs/nfsfs/ directory 1332 */ 1333int __init nfs_fs_proc_init(void) 1334{ 1335 if (!proc_mkdir("fs/nfsfs", NULL)) 1336 goto error_0; 1337 1338 /* a file of servers with which we're dealing */ 1339 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1340 goto error_1; 1341 1342 /* a file of volumes that we have mounted */ 1343 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1344 goto error_1; 1345 1346 return 0; 1347error_1: 1348 remove_proc_subtree("fs/nfsfs", NULL); 1349error_0: 1350 return -ENOMEM; 1351} 1352 1353/* 1354 * clean up the /proc/fs/nfsfs/ directory 1355 */ 1356void nfs_fs_proc_exit(void) 1357{ 1358 remove_proc_subtree("fs/nfsfs", NULL); 1359} 1360 1361#endif /* CONFIG_PROC_FS */ 1362