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 57 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58 static DEFINE_SPINLOCK(nfs_version_lock); 59 static DEFINE_MUTEX(nfs_version_mutex); 60 static LIST_HEAD(nfs_versions); 61 62 /* 63 * RPC cruft for NFS 64 */ 65 static const struct rpc_version *nfs_version[5] = { 66 [2] = NULL, 67 [3] = NULL, 68 [4] = NULL, 69 }; 70 71 const struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .stats = &nfs_rpcstat, 77 .pipe_dir_name = NFS_PIPE_DIRNAME, 78 }; 79 80 struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82 }; 83 84 static struct nfs_subversion *find_nfs_version(unsigned int version) 85 { 86 struct nfs_subversion *nfs; 87 spin_lock(&nfs_version_lock); 88 89 list_for_each_entry(nfs, &nfs_versions, list) { 90 if (nfs->rpc_ops->version == version) { 91 spin_unlock(&nfs_version_lock); 92 return nfs; 93 } 94 } 95 96 spin_unlock(&nfs_version_lock); 97 return ERR_PTR(-EPROTONOSUPPORT); 98 } 99 100 struct nfs_subversion *get_nfs_version(unsigned int version) 101 { 102 struct nfs_subversion *nfs = find_nfs_version(version); 103 104 if (IS_ERR(nfs)) { 105 mutex_lock(&nfs_version_mutex); 106 request_module("nfsv%d", version); 107 nfs = find_nfs_version(version); 108 mutex_unlock(&nfs_version_mutex); 109 } 110 111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 112 return ERR_PTR(-EAGAIN); 113 return nfs; 114 } 115 116 void put_nfs_version(struct nfs_subversion *nfs) 117 { 118 module_put(nfs->owner); 119 } 120 121 void register_nfs_version(struct nfs_subversion *nfs) 122 { 123 spin_lock(&nfs_version_lock); 124 125 list_add(&nfs->list, &nfs_versions); 126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 127 128 spin_unlock(&nfs_version_lock); 129 } 130 EXPORT_SYMBOL_GPL(register_nfs_version); 131 132 void unregister_nfs_version(struct nfs_subversion *nfs) 133 { 134 spin_lock(&nfs_version_lock); 135 136 nfs_version[nfs->rpc_ops->version] = NULL; 137 list_del(&nfs->list); 138 139 spin_unlock(&nfs_version_lock); 140 } 141 EXPORT_SYMBOL_GPL(unregister_nfs_version); 142 143 /* 144 * Allocate a shared client record 145 * 146 * Since these are allocated/deallocated very rarely, we don't 147 * bother putting them in a slab cache... 148 */ 149 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 150 { 151 struct nfs_client *clp; 152 int err = -ENOMEM; 153 154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 155 goto error_0; 156 157 clp->cl_minorversion = cl_init->minorversion; 158 clp->cl_nfs_mod = cl_init->nfs_mod; 159 if (!try_module_get(clp->cl_nfs_mod->owner)) 160 goto error_dealloc; 161 162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 163 164 refcount_set(&clp->cl_count, 1); 165 clp->cl_cons_state = NFS_CS_INITING; 166 167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 168 clp->cl_addrlen = cl_init->addrlen; 169 170 if (cl_init->hostname) { 171 err = -ENOMEM; 172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 173 if (!clp->cl_hostname) 174 goto error_cleanup; 175 } 176 177 INIT_LIST_HEAD(&clp->cl_superblocks); 178 clp->cl_rpcclient = ERR_PTR(-EINVAL); 179 180 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; 188 189 error_cleanup: 190 put_nfs_version(clp->cl_nfs_mod); 191 error_dealloc: 192 kfree(clp); 193 error_0: 194 return ERR_PTR(err); 195 } 196 EXPORT_SYMBOL_GPL(nfs_alloc_client); 197 198 #if IS_ENABLED(CONFIG_NFS_V4) 199 static 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 */ 207 static 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 } 214 215 static void pnfs_init_server(struct nfs_server *server) 216 { 217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 218 } 219 220 #else 221 static void nfs_cleanup_cb_ident_idr(struct net *net) 222 { 223 } 224 225 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 226 { 227 } 228 229 static 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 */ 238 void 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 } 252 EXPORT_SYMBOL_GPL(nfs_free_client); 253 254 /* 255 * Release a reference to a shared client record 256 */ 257 void 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 } 276 EXPORT_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 */ 282 static 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; 288 289 again: 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 */ 342 bool nfs_client_init_is_complete(const struct nfs_client *clp) 343 { 344 return clp->cl_cons_state <= NFS_CS_READY; 345 } 346 EXPORT_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 */ 354 int 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 } 363 EXPORT_SYMBOL_GPL(nfs_client_init_status); 364 365 int 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 } 370 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 371 372 /* 373 * Found an existing client. Make sure it's ready before returning. 374 */ 375 static struct nfs_client * 376 nfs_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 */ 401 struct 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 NULL; 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 new->cl_flags = cl_init->init_flags; 430 return rpc_ops->init_client(new, cl_init); 431 } 432 433 spin_unlock(&nn->nfs_client_lock); 434 435 new = rpc_ops->alloc_client(cl_init); 436 } while (!IS_ERR(new)); 437 438 return new; 439 } 440 EXPORT_SYMBOL_GPL(nfs_get_client); 441 442 /* 443 * Mark a server as ready or failed 444 */ 445 void nfs_mark_client_ready(struct nfs_client *clp, int state) 446 { 447 smp_wmb(); 448 clp->cl_cons_state = state; 449 wake_up_all(&nfs_client_active_wq); 450 } 451 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 452 453 /* 454 * Initialise the timeout values for a connection 455 */ 456 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 457 int timeo, int retrans) 458 { 459 to->to_initval = timeo * HZ / 10; 460 to->to_retries = retrans; 461 462 switch (proto) { 463 case XPRT_TRANSPORT_TCP: 464 case XPRT_TRANSPORT_RDMA: 465 if (retrans == NFS_UNSPEC_RETRANS) 466 to->to_retries = NFS_DEF_TCP_RETRANS; 467 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 468 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 469 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 470 to->to_initval = NFS_MAX_TCP_TIMEOUT; 471 to->to_increment = to->to_initval; 472 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 473 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 474 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 475 if (to->to_maxval < to->to_initval) 476 to->to_maxval = to->to_initval; 477 to->to_exponential = 0; 478 break; 479 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 480 case XPRT_TRANSPORT_UDP: 481 if (retrans == NFS_UNSPEC_RETRANS) 482 to->to_retries = NFS_DEF_UDP_RETRANS; 483 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 484 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 485 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 486 to->to_initval = NFS_MAX_UDP_TIMEOUT; 487 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 488 to->to_exponential = 1; 489 break; 490 #endif 491 default: 492 BUG(); 493 } 494 } 495 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 496 497 /* 498 * Create an RPC client handle 499 */ 500 int nfs_create_rpc_client(struct nfs_client *clp, 501 const struct nfs_client_initdata *cl_init, 502 rpc_authflavor_t flavor) 503 { 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 .version = clp->rpc_ops->version, 516 .authflavor = flavor, 517 .cred = cl_init->cred, 518 }; 519 520 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 521 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 522 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 523 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 524 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 525 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 526 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 527 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 528 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 529 args.flags |= RPC_CLNT_CREATE_NOPING; 530 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 531 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 532 533 if (!IS_ERR(clp->cl_rpcclient)) 534 return 0; 535 536 clnt = rpc_create(&args); 537 if (IS_ERR(clnt)) { 538 dprintk("%s: cannot create RPC client. Error = %ld\n", 539 __func__, PTR_ERR(clnt)); 540 return PTR_ERR(clnt); 541 } 542 543 clnt->cl_principal = clp->cl_principal; 544 clp->cl_rpcclient = clnt; 545 return 0; 546 } 547 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 548 549 /* 550 * Version 2 or 3 client destruction 551 */ 552 static void nfs_destroy_server(struct nfs_server *server) 553 { 554 if (server->nlm_host) 555 nlmclnt_done(server->nlm_host); 556 } 557 558 /* 559 * Version 2 or 3 lockd setup 560 */ 561 static int nfs_start_lockd(struct nfs_server *server) 562 { 563 struct nlm_host *host; 564 struct nfs_client *clp = server->nfs_client; 565 struct nlmclnt_initdata nlm_init = { 566 .hostname = clp->cl_hostname, 567 .address = (struct sockaddr *)&clp->cl_addr, 568 .addrlen = clp->cl_addrlen, 569 .nfs_version = clp->rpc_ops->version, 570 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 571 1 : 0, 572 .net = clp->cl_net, 573 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 574 .cred = server->cred, 575 }; 576 577 if (nlm_init.nfs_version > 3) 578 return 0; 579 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 580 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 581 return 0; 582 583 switch (clp->cl_proto) { 584 default: 585 nlm_init.protocol = IPPROTO_TCP; 586 break; 587 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 588 case XPRT_TRANSPORT_UDP: 589 nlm_init.protocol = IPPROTO_UDP; 590 #endif 591 } 592 593 host = nlmclnt_init(&nlm_init); 594 if (IS_ERR(host)) 595 return PTR_ERR(host); 596 597 server->nlm_host = host; 598 server->destroy = nfs_destroy_server; 599 return 0; 600 } 601 602 /* 603 * Create a general RPC client 604 */ 605 int nfs_init_server_rpcclient(struct nfs_server *server, 606 const struct rpc_timeout *timeo, 607 rpc_authflavor_t pseudoflavour) 608 { 609 struct nfs_client *clp = server->nfs_client; 610 611 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 612 pseudoflavour); 613 if (IS_ERR(server->client)) { 614 dprintk("%s: couldn't create rpc_client!\n", __func__); 615 return PTR_ERR(server->client); 616 } 617 618 memcpy(&server->client->cl_timeout_default, 619 timeo, 620 sizeof(server->client->cl_timeout_default)); 621 server->client->cl_timeout = &server->client->cl_timeout_default; 622 server->client->cl_softrtry = 0; 623 if (server->flags & NFS_MOUNT_SOFTERR) 624 server->client->cl_softerr = 1; 625 if (server->flags & NFS_MOUNT_SOFT) 626 server->client->cl_softrtry = 1; 627 628 return 0; 629 } 630 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 631 632 /** 633 * nfs_init_client - Initialise an NFS2 or NFS3 client 634 * 635 * @clp: nfs_client to initialise 636 * @cl_init: Initialisation parameters 637 * 638 * Returns pointer to an NFS client, or an ERR_PTR value. 639 */ 640 struct nfs_client *nfs_init_client(struct nfs_client *clp, 641 const struct nfs_client_initdata *cl_init) 642 { 643 int error; 644 645 /* the client is already initialised */ 646 if (clp->cl_cons_state == NFS_CS_READY) 647 return clp; 648 649 /* 650 * Create a client RPC handle for doing FSSTAT with UNIX auth only 651 * - RFC 2623, sec 2.3.2 652 */ 653 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 654 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 655 if (error < 0) { 656 nfs_put_client(clp); 657 clp = ERR_PTR(error); 658 } 659 return clp; 660 } 661 EXPORT_SYMBOL_GPL(nfs_init_client); 662 663 /* 664 * Create a version 2 or 3 client 665 */ 666 static int nfs_init_server(struct nfs_server *server, 667 const struct fs_context *fc) 668 { 669 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 670 struct rpc_timeout timeparms; 671 struct nfs_client_initdata cl_init = { 672 .hostname = ctx->nfs_server.hostname, 673 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 674 .addrlen = ctx->nfs_server.addrlen, 675 .nfs_mod = ctx->nfs_mod, 676 .proto = ctx->nfs_server.protocol, 677 .net = fc->net_ns, 678 .timeparms = &timeparms, 679 .cred = server->cred, 680 .nconnect = ctx->nfs_server.nconnect, 681 .init_flags = (1UL << NFS_CS_REUSEPORT), 682 }; 683 struct nfs_client *clp; 684 int error; 685 686 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 687 ctx->timeo, ctx->retrans); 688 if (ctx->flags & NFS_MOUNT_NORESVPORT) 689 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 690 691 /* Allocate or find a client reference we can use */ 692 clp = nfs_get_client(&cl_init); 693 if (IS_ERR(clp)) 694 return PTR_ERR(clp); 695 696 server->nfs_client = clp; 697 698 /* Initialise the client representation from the mount data */ 699 server->flags = ctx->flags; 700 server->options = ctx->options; 701 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 702 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 703 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 704 705 if (ctx->rsize) 706 server->rsize = nfs_block_size(ctx->rsize, NULL); 707 if (ctx->wsize) 708 server->wsize = nfs_block_size(ctx->wsize, NULL); 709 710 server->acregmin = ctx->acregmin * HZ; 711 server->acregmax = ctx->acregmax * HZ; 712 server->acdirmin = ctx->acdirmin * HZ; 713 server->acdirmax = ctx->acdirmax * HZ; 714 715 /* Start lockd here, before we might error out */ 716 error = nfs_start_lockd(server); 717 if (error < 0) 718 goto error; 719 720 server->port = ctx->nfs_server.port; 721 server->auth_info = ctx->auth_info; 722 723 error = nfs_init_server_rpcclient(server, &timeparms, 724 ctx->selected_flavor); 725 if (error < 0) 726 goto error; 727 728 /* Preserve the values of mount_server-related mount options */ 729 if (ctx->mount_server.addrlen) { 730 memcpy(&server->mountd_address, &ctx->mount_server.address, 731 ctx->mount_server.addrlen); 732 server->mountd_addrlen = ctx->mount_server.addrlen; 733 } 734 server->mountd_version = ctx->mount_server.version; 735 server->mountd_port = ctx->mount_server.port; 736 server->mountd_protocol = ctx->mount_server.protocol; 737 738 server->namelen = ctx->namlen; 739 return 0; 740 741 error: 742 server->nfs_client = NULL; 743 nfs_put_client(clp); 744 return error; 745 } 746 747 /* 748 * Load up the server record from information gained in an fsinfo record 749 */ 750 static void nfs_server_set_fsinfo(struct nfs_server *server, 751 struct nfs_fsinfo *fsinfo) 752 { 753 unsigned long max_rpc_payload, raw_max_rpc_payload; 754 755 /* Work out a lot of parameters */ 756 if (server->rsize == 0) 757 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 758 if (server->wsize == 0) 759 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 760 761 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 762 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 763 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 764 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 765 766 raw_max_rpc_payload = rpc_max_payload(server->client); 767 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 768 769 if (server->rsize > max_rpc_payload) 770 server->rsize = max_rpc_payload; 771 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 772 server->rsize = NFS_MAX_FILE_IO_SIZE; 773 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 774 775 if (server->wsize > max_rpc_payload) 776 server->wsize = max_rpc_payload; 777 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 778 server->wsize = NFS_MAX_FILE_IO_SIZE; 779 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 780 781 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 782 783 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 784 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 785 server->dtsize = NFS_MAX_FILE_IO_SIZE; 786 if (server->dtsize > server->rsize) 787 server->dtsize = server->rsize; 788 789 if (server->flags & NFS_MOUNT_NOAC) { 790 server->acregmin = server->acregmax = 0; 791 server->acdirmin = server->acdirmax = 0; 792 } 793 794 server->maxfilesize = fsinfo->maxfilesize; 795 796 server->time_delta = fsinfo->time_delta; 797 798 server->clone_blksize = fsinfo->clone_blksize; 799 /* We're airborne Set socket buffersize */ 800 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 801 802 #ifdef CONFIG_NFS_V4_2 803 /* 804 * Defaults until limited by the session parameters. 805 */ 806 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 807 XATTR_SIZE_MAX); 808 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 809 XATTR_SIZE_MAX); 810 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 811 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 812 813 if (fsinfo->xattr_support) 814 server->caps |= NFS_CAP_XATTR; 815 #endif 816 } 817 818 /* 819 * Probe filesystem information, including the FSID on v2/v3 820 */ 821 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 822 { 823 struct nfs_fsinfo fsinfo; 824 struct nfs_client *clp = server->nfs_client; 825 int error; 826 827 if (clp->rpc_ops->set_capabilities != NULL) { 828 error = clp->rpc_ops->set_capabilities(server, mntfh); 829 if (error < 0) 830 return error; 831 } 832 833 fsinfo.fattr = fattr; 834 fsinfo.nlayouttypes = 0; 835 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 836 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 837 if (error < 0) 838 return error; 839 840 nfs_server_set_fsinfo(server, &fsinfo); 841 842 /* Get some general file system info */ 843 if (server->namelen == 0) { 844 struct nfs_pathconf pathinfo; 845 846 pathinfo.fattr = fattr; 847 nfs_fattr_init(fattr); 848 849 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 850 server->namelen = pathinfo.max_namelen; 851 } 852 853 return 0; 854 } 855 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 856 857 /* 858 * Copy useful information when duplicating a server record 859 */ 860 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 861 { 862 target->flags = source->flags; 863 target->rsize = source->rsize; 864 target->wsize = source->wsize; 865 target->acregmin = source->acregmin; 866 target->acregmax = source->acregmax; 867 target->acdirmin = source->acdirmin; 868 target->acdirmax = source->acdirmax; 869 target->caps = source->caps; 870 target->options = source->options; 871 target->auth_info = source->auth_info; 872 target->port = source->port; 873 } 874 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 875 876 void nfs_server_insert_lists(struct nfs_server *server) 877 { 878 struct nfs_client *clp = server->nfs_client; 879 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 880 881 spin_lock(&nn->nfs_client_lock); 882 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 883 list_add_tail(&server->master_link, &nn->nfs_volume_list); 884 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 885 spin_unlock(&nn->nfs_client_lock); 886 887 } 888 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 889 890 void nfs_server_remove_lists(struct nfs_server *server) 891 { 892 struct nfs_client *clp = server->nfs_client; 893 struct nfs_net *nn; 894 895 if (clp == NULL) 896 return; 897 nn = net_generic(clp->cl_net, nfs_net_id); 898 spin_lock(&nn->nfs_client_lock); 899 list_del_rcu(&server->client_link); 900 if (list_empty(&clp->cl_superblocks)) 901 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 902 list_del(&server->master_link); 903 spin_unlock(&nn->nfs_client_lock); 904 905 synchronize_rcu(); 906 } 907 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 908 909 /* 910 * Allocate and initialise a server record 911 */ 912 struct nfs_server *nfs_alloc_server(void) 913 { 914 struct nfs_server *server; 915 916 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 917 if (!server) 918 return NULL; 919 920 server->client = server->client_acl = ERR_PTR(-EINVAL); 921 922 /* Zero out the NFS state stuff */ 923 INIT_LIST_HEAD(&server->client_link); 924 INIT_LIST_HEAD(&server->master_link); 925 INIT_LIST_HEAD(&server->delegations); 926 INIT_LIST_HEAD(&server->layouts); 927 INIT_LIST_HEAD(&server->state_owners_lru); 928 INIT_LIST_HEAD(&server->ss_copies); 929 930 atomic_set(&server->active, 0); 931 932 server->io_stats = nfs_alloc_iostats(); 933 if (!server->io_stats) { 934 kfree(server); 935 return NULL; 936 } 937 938 ida_init(&server->openowner_id); 939 ida_init(&server->lockowner_id); 940 pnfs_init_server(server); 941 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 942 943 return server; 944 } 945 EXPORT_SYMBOL_GPL(nfs_alloc_server); 946 947 /* 948 * Free up a server record 949 */ 950 void nfs_free_server(struct nfs_server *server) 951 { 952 nfs_server_remove_lists(server); 953 954 if (server->destroy != NULL) 955 server->destroy(server); 956 957 if (!IS_ERR(server->client_acl)) 958 rpc_shutdown_client(server->client_acl); 959 if (!IS_ERR(server->client)) 960 rpc_shutdown_client(server->client); 961 962 nfs_put_client(server->nfs_client); 963 964 ida_destroy(&server->lockowner_id); 965 ida_destroy(&server->openowner_id); 966 nfs_free_iostats(server->io_stats); 967 put_cred(server->cred); 968 kfree(server); 969 nfs_release_automount_timer(); 970 } 971 EXPORT_SYMBOL_GPL(nfs_free_server); 972 973 /* 974 * Create a version 2 or 3 volume record 975 * - keyed on server and FSID 976 */ 977 struct nfs_server *nfs_create_server(struct fs_context *fc) 978 { 979 struct nfs_fs_context *ctx = nfs_fc2context(fc); 980 struct nfs_server *server; 981 struct nfs_fattr *fattr; 982 int error; 983 984 server = nfs_alloc_server(); 985 if (!server) 986 return ERR_PTR(-ENOMEM); 987 988 server->cred = get_cred(fc->cred); 989 990 error = -ENOMEM; 991 fattr = nfs_alloc_fattr(); 992 if (fattr == NULL) 993 goto error; 994 995 /* Get a client representation */ 996 error = nfs_init_server(server, fc); 997 if (error < 0) 998 goto error; 999 1000 /* Probe the root fh to retrieve its FSID */ 1001 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1002 if (error < 0) 1003 goto error; 1004 if (server->nfs_client->rpc_ops->version == 3) { 1005 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1006 server->namelen = NFS3_MAXNAMLEN; 1007 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1008 server->caps |= NFS_CAP_READDIRPLUS; 1009 } else { 1010 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1011 server->namelen = NFS2_MAXNAMLEN; 1012 } 1013 1014 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1015 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1016 fattr, NULL, NULL); 1017 if (error < 0) { 1018 dprintk("nfs_create_server: getattr error = %d\n", -error); 1019 goto error; 1020 } 1021 } 1022 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1023 1024 dprintk("Server FSID: %llx:%llx\n", 1025 (unsigned long long) server->fsid.major, 1026 (unsigned long long) server->fsid.minor); 1027 1028 nfs_server_insert_lists(server); 1029 server->mount_time = jiffies; 1030 nfs_free_fattr(fattr); 1031 return server; 1032 1033 error: 1034 nfs_free_fattr(fattr); 1035 nfs_free_server(server); 1036 return ERR_PTR(error); 1037 } 1038 EXPORT_SYMBOL_GPL(nfs_create_server); 1039 1040 /* 1041 * Clone an NFS2, NFS3 or NFS4 server record 1042 */ 1043 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1044 struct nfs_fh *fh, 1045 struct nfs_fattr *fattr, 1046 rpc_authflavor_t flavor) 1047 { 1048 struct nfs_server *server; 1049 struct nfs_fattr *fattr_fsinfo; 1050 int error; 1051 1052 server = nfs_alloc_server(); 1053 if (!server) 1054 return ERR_PTR(-ENOMEM); 1055 1056 server->cred = get_cred(source->cred); 1057 1058 error = -ENOMEM; 1059 fattr_fsinfo = nfs_alloc_fattr(); 1060 if (fattr_fsinfo == NULL) 1061 goto out_free_server; 1062 1063 /* Copy data from the source */ 1064 server->nfs_client = source->nfs_client; 1065 server->destroy = source->destroy; 1066 refcount_inc(&server->nfs_client->cl_count); 1067 nfs_server_copy_userdata(server, source); 1068 1069 server->fsid = fattr->fsid; 1070 1071 error = nfs_init_server_rpcclient(server, 1072 source->client->cl_timeout, 1073 flavor); 1074 if (error < 0) 1075 goto out_free_server; 1076 1077 /* probe the filesystem info for this server filesystem */ 1078 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1079 if (error < 0) 1080 goto out_free_server; 1081 1082 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1083 server->namelen = NFS4_MAXNAMLEN; 1084 1085 error = nfs_start_lockd(server); 1086 if (error < 0) 1087 goto out_free_server; 1088 1089 nfs_server_insert_lists(server); 1090 server->mount_time = jiffies; 1091 1092 nfs_free_fattr(fattr_fsinfo); 1093 return server; 1094 1095 out_free_server: 1096 nfs_free_fattr(fattr_fsinfo); 1097 nfs_free_server(server); 1098 return ERR_PTR(error); 1099 } 1100 EXPORT_SYMBOL_GPL(nfs_clone_server); 1101 1102 void nfs_clients_init(struct net *net) 1103 { 1104 struct nfs_net *nn = net_generic(net, nfs_net_id); 1105 1106 INIT_LIST_HEAD(&nn->nfs_client_list); 1107 INIT_LIST_HEAD(&nn->nfs_volume_list); 1108 #if IS_ENABLED(CONFIG_NFS_V4) 1109 idr_init(&nn->cb_ident_idr); 1110 #endif 1111 spin_lock_init(&nn->nfs_client_lock); 1112 nn->boot_time = ktime_get_real(); 1113 1114 nfs_netns_sysfs_setup(nn, net); 1115 } 1116 1117 void nfs_clients_exit(struct net *net) 1118 { 1119 struct nfs_net *nn = net_generic(net, nfs_net_id); 1120 1121 nfs_netns_sysfs_destroy(nn); 1122 nfs_cleanup_cb_ident_idr(net); 1123 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1124 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1125 } 1126 1127 #ifdef CONFIG_PROC_FS 1128 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1129 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1130 static void nfs_server_list_stop(struct seq_file *p, void *v); 1131 static int nfs_server_list_show(struct seq_file *m, void *v); 1132 1133 static const struct seq_operations nfs_server_list_ops = { 1134 .start = nfs_server_list_start, 1135 .next = nfs_server_list_next, 1136 .stop = nfs_server_list_stop, 1137 .show = nfs_server_list_show, 1138 }; 1139 1140 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1141 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1142 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1143 static int nfs_volume_list_show(struct seq_file *m, void *v); 1144 1145 static const struct seq_operations nfs_volume_list_ops = { 1146 .start = nfs_volume_list_start, 1147 .next = nfs_volume_list_next, 1148 .stop = nfs_volume_list_stop, 1149 .show = nfs_volume_list_show, 1150 }; 1151 1152 /* 1153 * set up the iterator to start reading from the server list and return the first item 1154 */ 1155 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1156 __acquires(&nn->nfs_client_lock) 1157 { 1158 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1159 1160 /* lock the list against modification */ 1161 spin_lock(&nn->nfs_client_lock); 1162 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1163 } 1164 1165 /* 1166 * move to next server 1167 */ 1168 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1169 { 1170 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1171 1172 return seq_list_next(v, &nn->nfs_client_list, pos); 1173 } 1174 1175 /* 1176 * clean up after reading from the transports list 1177 */ 1178 static void nfs_server_list_stop(struct seq_file *p, void *v) 1179 __releases(&nn->nfs_client_lock) 1180 { 1181 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1182 1183 spin_unlock(&nn->nfs_client_lock); 1184 } 1185 1186 /* 1187 * display a header line followed by a load of call lines 1188 */ 1189 static int nfs_server_list_show(struct seq_file *m, void *v) 1190 { 1191 struct nfs_client *clp; 1192 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1193 1194 /* display header on line 1 */ 1195 if (v == &nn->nfs_client_list) { 1196 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1197 return 0; 1198 } 1199 1200 /* display one transport per line on subsequent lines */ 1201 clp = list_entry(v, struct nfs_client, cl_share_link); 1202 1203 /* Check if the client is initialized */ 1204 if (clp->cl_cons_state != NFS_CS_READY) 1205 return 0; 1206 1207 rcu_read_lock(); 1208 seq_printf(m, "v%u %s %s %3d %s\n", 1209 clp->rpc_ops->version, 1210 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1211 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1212 refcount_read(&clp->cl_count), 1213 clp->cl_hostname); 1214 rcu_read_unlock(); 1215 1216 return 0; 1217 } 1218 1219 /* 1220 * set up the iterator to start reading from the volume list and return the first item 1221 */ 1222 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1223 __acquires(&nn->nfs_client_lock) 1224 { 1225 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1226 1227 /* lock the list against modification */ 1228 spin_lock(&nn->nfs_client_lock); 1229 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1230 } 1231 1232 /* 1233 * move to next volume 1234 */ 1235 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1236 { 1237 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1238 1239 return seq_list_next(v, &nn->nfs_volume_list, pos); 1240 } 1241 1242 /* 1243 * clean up after reading from the transports list 1244 */ 1245 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1246 __releases(&nn->nfs_client_lock) 1247 { 1248 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1249 1250 spin_unlock(&nn->nfs_client_lock); 1251 } 1252 1253 /* 1254 * display a header line followed by a load of call lines 1255 */ 1256 static int nfs_volume_list_show(struct seq_file *m, void *v) 1257 { 1258 struct nfs_server *server; 1259 struct nfs_client *clp; 1260 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1261 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1262 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1263 1264 /* display header on line 1 */ 1265 if (v == &nn->nfs_volume_list) { 1266 seq_puts(m, "NV SERVER PORT DEV FSID" 1267 " FSC\n"); 1268 return 0; 1269 } 1270 /* display one transport per line on subsequent lines */ 1271 server = list_entry(v, struct nfs_server, master_link); 1272 clp = server->nfs_client; 1273 1274 snprintf(dev, sizeof(dev), "%u:%u", 1275 MAJOR(server->s_dev), MINOR(server->s_dev)); 1276 1277 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1278 (unsigned long long) server->fsid.major, 1279 (unsigned long long) server->fsid.minor); 1280 1281 rcu_read_lock(); 1282 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1283 clp->rpc_ops->version, 1284 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1285 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1286 dev, 1287 fsid, 1288 nfs_server_fscache_state(server)); 1289 rcu_read_unlock(); 1290 1291 return 0; 1292 } 1293 1294 int nfs_fs_proc_net_init(struct net *net) 1295 { 1296 struct nfs_net *nn = net_generic(net, nfs_net_id); 1297 struct proc_dir_entry *p; 1298 1299 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1300 if (!nn->proc_nfsfs) 1301 goto error_0; 1302 1303 /* a file of servers with which we're dealing */ 1304 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1305 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1306 if (!p) 1307 goto error_1; 1308 1309 /* a file of volumes that we have mounted */ 1310 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1311 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1312 if (!p) 1313 goto error_1; 1314 return 0; 1315 1316 error_1: 1317 remove_proc_subtree("nfsfs", net->proc_net); 1318 error_0: 1319 return -ENOMEM; 1320 } 1321 1322 void nfs_fs_proc_net_exit(struct net *net) 1323 { 1324 remove_proc_subtree("nfsfs", net->proc_net); 1325 } 1326 1327 /* 1328 * initialise the /proc/fs/nfsfs/ directory 1329 */ 1330 int __init nfs_fs_proc_init(void) 1331 { 1332 if (!proc_mkdir("fs/nfsfs", NULL)) 1333 goto error_0; 1334 1335 /* a file of servers with which we're dealing */ 1336 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1337 goto error_1; 1338 1339 /* a file of volumes that we have mounted */ 1340 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1341 goto error_1; 1342 1343 return 0; 1344 error_1: 1345 remove_proc_subtree("fs/nfsfs", NULL); 1346 error_0: 1347 return -ENOMEM; 1348 } 1349 1350 /* 1351 * clean up the /proc/fs/nfsfs/ directory 1352 */ 1353 void nfs_fs_proc_exit(void) 1354 { 1355 remove_proc_subtree("fs/nfsfs", NULL); 1356 } 1357 1358 #endif /* CONFIG_PROC_FS */ 1359