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 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 default: 490 BUG(); 491 } 492 } 493 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 494 495 /* 496 * Create an RPC client handle 497 */ 498 int nfs_create_rpc_client(struct nfs_client *clp, 499 const struct nfs_client_initdata *cl_init, 500 rpc_authflavor_t flavor) 501 { 502 struct rpc_clnt *clnt = NULL; 503 struct rpc_create_args args = { 504 .net = clp->cl_net, 505 .protocol = clp->cl_proto, 506 .nconnect = clp->cl_nconnect, 507 .address = (struct sockaddr *)&clp->cl_addr, 508 .addrsize = clp->cl_addrlen, 509 .timeout = cl_init->timeparms, 510 .servername = clp->cl_hostname, 511 .nodename = cl_init->nodename, 512 .program = &nfs_program, 513 .version = clp->rpc_ops->version, 514 .authflavor = flavor, 515 .cred = cl_init->cred, 516 }; 517 518 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 519 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 520 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 521 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 522 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 523 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 524 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 525 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 526 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 527 args.flags |= RPC_CLNT_CREATE_NOPING; 528 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 529 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 530 531 if (!IS_ERR(clp->cl_rpcclient)) 532 return 0; 533 534 clnt = rpc_create(&args); 535 if (IS_ERR(clnt)) { 536 dprintk("%s: cannot create RPC client. Error = %ld\n", 537 __func__, PTR_ERR(clnt)); 538 return PTR_ERR(clnt); 539 } 540 541 clnt->cl_principal = clp->cl_principal; 542 clp->cl_rpcclient = clnt; 543 return 0; 544 } 545 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 546 547 /* 548 * Version 2 or 3 client destruction 549 */ 550 static void nfs_destroy_server(struct nfs_server *server) 551 { 552 if (server->nlm_host) 553 nlmclnt_done(server->nlm_host); 554 } 555 556 /* 557 * Version 2 or 3 lockd setup 558 */ 559 static int nfs_start_lockd(struct nfs_server *server) 560 { 561 struct nlm_host *host; 562 struct nfs_client *clp = server->nfs_client; 563 struct nlmclnt_initdata nlm_init = { 564 .hostname = clp->cl_hostname, 565 .address = (struct sockaddr *)&clp->cl_addr, 566 .addrlen = clp->cl_addrlen, 567 .nfs_version = clp->rpc_ops->version, 568 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 569 1 : 0, 570 .net = clp->cl_net, 571 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 572 .cred = server->cred, 573 }; 574 575 if (nlm_init.nfs_version > 3) 576 return 0; 577 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 578 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 579 return 0; 580 581 switch (clp->cl_proto) { 582 default: 583 nlm_init.protocol = IPPROTO_TCP; 584 break; 585 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 586 case XPRT_TRANSPORT_UDP: 587 nlm_init.protocol = IPPROTO_UDP; 588 #endif 589 } 590 591 host = nlmclnt_init(&nlm_init); 592 if (IS_ERR(host)) 593 return PTR_ERR(host); 594 595 server->nlm_host = host; 596 server->destroy = nfs_destroy_server; 597 return 0; 598 } 599 600 /* 601 * Create a general RPC client 602 */ 603 int nfs_init_server_rpcclient(struct nfs_server *server, 604 const struct rpc_timeout *timeo, 605 rpc_authflavor_t pseudoflavour) 606 { 607 struct nfs_client *clp = server->nfs_client; 608 609 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 610 pseudoflavour); 611 if (IS_ERR(server->client)) { 612 dprintk("%s: couldn't create rpc_client!\n", __func__); 613 return PTR_ERR(server->client); 614 } 615 616 memcpy(&server->client->cl_timeout_default, 617 timeo, 618 sizeof(server->client->cl_timeout_default)); 619 server->client->cl_timeout = &server->client->cl_timeout_default; 620 server->client->cl_softrtry = 0; 621 if (server->flags & NFS_MOUNT_SOFTERR) 622 server->client->cl_softerr = 1; 623 if (server->flags & NFS_MOUNT_SOFT) 624 server->client->cl_softrtry = 1; 625 626 return 0; 627 } 628 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 629 630 /** 631 * nfs_init_client - Initialise an NFS2 or NFS3 client 632 * 633 * @clp: nfs_client to initialise 634 * @cl_init: Initialisation parameters 635 * 636 * Returns pointer to an NFS client, or an ERR_PTR value. 637 */ 638 struct nfs_client *nfs_init_client(struct nfs_client *clp, 639 const struct nfs_client_initdata *cl_init) 640 { 641 int error; 642 643 /* the client is already initialised */ 644 if (clp->cl_cons_state == NFS_CS_READY) 645 return clp; 646 647 /* 648 * Create a client RPC handle for doing FSSTAT with UNIX auth only 649 * - RFC 2623, sec 2.3.2 650 */ 651 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 652 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 653 if (error < 0) { 654 nfs_put_client(clp); 655 clp = ERR_PTR(error); 656 } 657 return clp; 658 } 659 EXPORT_SYMBOL_GPL(nfs_init_client); 660 661 /* 662 * Create a version 2 or 3 client 663 */ 664 static int nfs_init_server(struct nfs_server *server, 665 const struct fs_context *fc) 666 { 667 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 668 struct rpc_timeout timeparms; 669 struct nfs_client_initdata cl_init = { 670 .hostname = ctx->nfs_server.hostname, 671 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 672 .addrlen = ctx->nfs_server.addrlen, 673 .nfs_mod = ctx->nfs_mod, 674 .proto = ctx->nfs_server.protocol, 675 .net = fc->net_ns, 676 .timeparms = &timeparms, 677 .cred = server->cred, 678 .nconnect = ctx->nfs_server.nconnect, 679 .init_flags = (1UL << NFS_CS_REUSEPORT), 680 }; 681 struct nfs_client *clp; 682 int error; 683 684 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 685 ctx->timeo, ctx->retrans); 686 if (ctx->flags & NFS_MOUNT_NORESVPORT) 687 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 688 689 /* Allocate or find a client reference we can use */ 690 clp = nfs_get_client(&cl_init); 691 if (IS_ERR(clp)) 692 return PTR_ERR(clp); 693 694 server->nfs_client = clp; 695 696 /* Initialise the client representation from the mount data */ 697 server->flags = ctx->flags; 698 server->options = ctx->options; 699 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 700 701 switch (clp->rpc_ops->version) { 702 case 2: 703 server->fattr_valid = NFS_ATTR_FATTR_V2; 704 break; 705 case 3: 706 server->fattr_valid = NFS_ATTR_FATTR_V3; 707 break; 708 default: 709 server->fattr_valid = NFS_ATTR_FATTR_V4; 710 } 711 712 if (ctx->rsize) 713 server->rsize = nfs_block_size(ctx->rsize, NULL); 714 if (ctx->wsize) 715 server->wsize = nfs_block_size(ctx->wsize, NULL); 716 717 server->acregmin = ctx->acregmin * HZ; 718 server->acregmax = ctx->acregmax * HZ; 719 server->acdirmin = ctx->acdirmin * HZ; 720 server->acdirmax = ctx->acdirmax * HZ; 721 722 /* Start lockd here, before we might error out */ 723 error = nfs_start_lockd(server); 724 if (error < 0) 725 goto error; 726 727 server->port = ctx->nfs_server.port; 728 server->auth_info = ctx->auth_info; 729 730 error = nfs_init_server_rpcclient(server, &timeparms, 731 ctx->selected_flavor); 732 if (error < 0) 733 goto error; 734 735 /* Preserve the values of mount_server-related mount options */ 736 if (ctx->mount_server.addrlen) { 737 memcpy(&server->mountd_address, &ctx->mount_server.address, 738 ctx->mount_server.addrlen); 739 server->mountd_addrlen = ctx->mount_server.addrlen; 740 } 741 server->mountd_version = ctx->mount_server.version; 742 server->mountd_port = ctx->mount_server.port; 743 server->mountd_protocol = ctx->mount_server.protocol; 744 745 server->namelen = ctx->namlen; 746 return 0; 747 748 error: 749 server->nfs_client = NULL; 750 nfs_put_client(clp); 751 return error; 752 } 753 754 /* 755 * Load up the server record from information gained in an fsinfo record 756 */ 757 static void nfs_server_set_fsinfo(struct nfs_server *server, 758 struct nfs_fsinfo *fsinfo) 759 { 760 unsigned long max_rpc_payload, raw_max_rpc_payload; 761 762 /* Work out a lot of parameters */ 763 if (server->rsize == 0) 764 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 765 if (server->wsize == 0) 766 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 767 768 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 769 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 770 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 771 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 772 773 raw_max_rpc_payload = rpc_max_payload(server->client); 774 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 775 776 if (server->rsize > max_rpc_payload) 777 server->rsize = max_rpc_payload; 778 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 779 server->rsize = NFS_MAX_FILE_IO_SIZE; 780 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 781 782 if (server->wsize > max_rpc_payload) 783 server->wsize = max_rpc_payload; 784 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 785 server->wsize = NFS_MAX_FILE_IO_SIZE; 786 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 787 788 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 789 790 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 791 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 792 server->dtsize = NFS_MAX_FILE_IO_SIZE; 793 if (server->dtsize > server->rsize) 794 server->dtsize = server->rsize; 795 796 if (server->flags & NFS_MOUNT_NOAC) { 797 server->acregmin = server->acregmax = 0; 798 server->acdirmin = server->acdirmax = 0; 799 } 800 801 server->maxfilesize = fsinfo->maxfilesize; 802 803 server->time_delta = fsinfo->time_delta; 804 server->change_attr_type = fsinfo->change_attr_type; 805 806 server->clone_blksize = fsinfo->clone_blksize; 807 /* We're airborne Set socket buffersize */ 808 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 809 810 #ifdef CONFIG_NFS_V4_2 811 /* 812 * Defaults until limited by the session parameters. 813 */ 814 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 815 XATTR_SIZE_MAX); 816 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 817 XATTR_SIZE_MAX); 818 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 819 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 820 821 if (fsinfo->xattr_support) 822 server->caps |= NFS_CAP_XATTR; 823 #endif 824 } 825 826 /* 827 * Probe filesystem information, including the FSID on v2/v3 828 */ 829 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 830 { 831 struct nfs_fsinfo fsinfo; 832 struct nfs_client *clp = server->nfs_client; 833 int error; 834 835 if (clp->rpc_ops->set_capabilities != NULL) { 836 error = clp->rpc_ops->set_capabilities(server, mntfh); 837 if (error < 0) 838 return error; 839 } 840 841 fsinfo.fattr = fattr; 842 fsinfo.nlayouttypes = 0; 843 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 844 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 845 if (error < 0) 846 return error; 847 848 nfs_server_set_fsinfo(server, &fsinfo); 849 850 /* Get some general file system info */ 851 if (server->namelen == 0) { 852 struct nfs_pathconf pathinfo; 853 854 pathinfo.fattr = fattr; 855 nfs_fattr_init(fattr); 856 857 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 858 server->namelen = pathinfo.max_namelen; 859 } 860 861 return 0; 862 } 863 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 864 865 /* 866 * Copy useful information when duplicating a server record 867 */ 868 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 869 { 870 target->flags = source->flags; 871 target->rsize = source->rsize; 872 target->wsize = source->wsize; 873 target->acregmin = source->acregmin; 874 target->acregmax = source->acregmax; 875 target->acdirmin = source->acdirmin; 876 target->acdirmax = source->acdirmax; 877 target->caps = source->caps; 878 target->options = source->options; 879 target->auth_info = source->auth_info; 880 target->port = source->port; 881 } 882 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 883 884 void nfs_server_insert_lists(struct nfs_server *server) 885 { 886 struct nfs_client *clp = server->nfs_client; 887 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 888 889 spin_lock(&nn->nfs_client_lock); 890 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 891 list_add_tail(&server->master_link, &nn->nfs_volume_list); 892 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 893 spin_unlock(&nn->nfs_client_lock); 894 895 } 896 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 897 898 void nfs_server_remove_lists(struct nfs_server *server) 899 { 900 struct nfs_client *clp = server->nfs_client; 901 struct nfs_net *nn; 902 903 if (clp == NULL) 904 return; 905 nn = net_generic(clp->cl_net, nfs_net_id); 906 spin_lock(&nn->nfs_client_lock); 907 list_del_rcu(&server->client_link); 908 if (list_empty(&clp->cl_superblocks)) 909 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 910 list_del(&server->master_link); 911 spin_unlock(&nn->nfs_client_lock); 912 913 synchronize_rcu(); 914 } 915 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 916 917 /* 918 * Allocate and initialise a server record 919 */ 920 struct nfs_server *nfs_alloc_server(void) 921 { 922 struct nfs_server *server; 923 924 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 925 if (!server) 926 return NULL; 927 928 server->client = server->client_acl = ERR_PTR(-EINVAL); 929 930 /* Zero out the NFS state stuff */ 931 INIT_LIST_HEAD(&server->client_link); 932 INIT_LIST_HEAD(&server->master_link); 933 INIT_LIST_HEAD(&server->delegations); 934 INIT_LIST_HEAD(&server->layouts); 935 INIT_LIST_HEAD(&server->state_owners_lru); 936 INIT_LIST_HEAD(&server->ss_copies); 937 938 atomic_set(&server->active, 0); 939 940 server->io_stats = nfs_alloc_iostats(); 941 if (!server->io_stats) { 942 kfree(server); 943 return NULL; 944 } 945 946 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 947 948 ida_init(&server->openowner_id); 949 ida_init(&server->lockowner_id); 950 pnfs_init_server(server); 951 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 952 953 return server; 954 } 955 EXPORT_SYMBOL_GPL(nfs_alloc_server); 956 957 /* 958 * Free up a server record 959 */ 960 void nfs_free_server(struct nfs_server *server) 961 { 962 nfs_server_remove_lists(server); 963 964 if (server->destroy != NULL) 965 server->destroy(server); 966 967 if (!IS_ERR(server->client_acl)) 968 rpc_shutdown_client(server->client_acl); 969 if (!IS_ERR(server->client)) 970 rpc_shutdown_client(server->client); 971 972 nfs_put_client(server->nfs_client); 973 974 ida_destroy(&server->lockowner_id); 975 ida_destroy(&server->openowner_id); 976 nfs_free_iostats(server->io_stats); 977 put_cred(server->cred); 978 kfree(server); 979 nfs_release_automount_timer(); 980 } 981 EXPORT_SYMBOL_GPL(nfs_free_server); 982 983 /* 984 * Create a version 2 or 3 volume record 985 * - keyed on server and FSID 986 */ 987 struct nfs_server *nfs_create_server(struct fs_context *fc) 988 { 989 struct nfs_fs_context *ctx = nfs_fc2context(fc); 990 struct nfs_server *server; 991 struct nfs_fattr *fattr; 992 int error; 993 994 server = nfs_alloc_server(); 995 if (!server) 996 return ERR_PTR(-ENOMEM); 997 998 server->cred = get_cred(fc->cred); 999 1000 error = -ENOMEM; 1001 fattr = nfs_alloc_fattr(); 1002 if (fattr == NULL) 1003 goto error; 1004 1005 /* Get a client representation */ 1006 error = nfs_init_server(server, fc); 1007 if (error < 0) 1008 goto error; 1009 1010 /* Probe the root fh to retrieve its FSID */ 1011 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1012 if (error < 0) 1013 goto error; 1014 if (server->nfs_client->rpc_ops->version == 3) { 1015 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1016 server->namelen = NFS3_MAXNAMLEN; 1017 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1018 server->caps |= NFS_CAP_READDIRPLUS; 1019 } else { 1020 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1021 server->namelen = NFS2_MAXNAMLEN; 1022 } 1023 1024 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1025 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1026 fattr, NULL, NULL); 1027 if (error < 0) { 1028 dprintk("nfs_create_server: getattr error = %d\n", -error); 1029 goto error; 1030 } 1031 } 1032 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1033 1034 dprintk("Server FSID: %llx:%llx\n", 1035 (unsigned long long) server->fsid.major, 1036 (unsigned long long) server->fsid.minor); 1037 1038 nfs_server_insert_lists(server); 1039 server->mount_time = jiffies; 1040 nfs_free_fattr(fattr); 1041 return server; 1042 1043 error: 1044 nfs_free_fattr(fattr); 1045 nfs_free_server(server); 1046 return ERR_PTR(error); 1047 } 1048 EXPORT_SYMBOL_GPL(nfs_create_server); 1049 1050 /* 1051 * Clone an NFS2, NFS3 or NFS4 server record 1052 */ 1053 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1054 struct nfs_fh *fh, 1055 struct nfs_fattr *fattr, 1056 rpc_authflavor_t flavor) 1057 { 1058 struct nfs_server *server; 1059 struct nfs_fattr *fattr_fsinfo; 1060 int error; 1061 1062 server = nfs_alloc_server(); 1063 if (!server) 1064 return ERR_PTR(-ENOMEM); 1065 1066 server->cred = get_cred(source->cred); 1067 1068 error = -ENOMEM; 1069 fattr_fsinfo = nfs_alloc_fattr(); 1070 if (fattr_fsinfo == NULL) 1071 goto out_free_server; 1072 1073 /* Copy data from the source */ 1074 server->nfs_client = source->nfs_client; 1075 server->destroy = source->destroy; 1076 refcount_inc(&server->nfs_client->cl_count); 1077 nfs_server_copy_userdata(server, source); 1078 1079 server->fsid = fattr->fsid; 1080 1081 error = nfs_init_server_rpcclient(server, 1082 source->client->cl_timeout, 1083 flavor); 1084 if (error < 0) 1085 goto out_free_server; 1086 1087 /* probe the filesystem info for this server filesystem */ 1088 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1089 if (error < 0) 1090 goto out_free_server; 1091 1092 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1093 server->namelen = NFS4_MAXNAMLEN; 1094 1095 error = nfs_start_lockd(server); 1096 if (error < 0) 1097 goto out_free_server; 1098 1099 nfs_server_insert_lists(server); 1100 server->mount_time = jiffies; 1101 1102 nfs_free_fattr(fattr_fsinfo); 1103 return server; 1104 1105 out_free_server: 1106 nfs_free_fattr(fattr_fsinfo); 1107 nfs_free_server(server); 1108 return ERR_PTR(error); 1109 } 1110 EXPORT_SYMBOL_GPL(nfs_clone_server); 1111 1112 void nfs_clients_init(struct net *net) 1113 { 1114 struct nfs_net *nn = net_generic(net, nfs_net_id); 1115 1116 INIT_LIST_HEAD(&nn->nfs_client_list); 1117 INIT_LIST_HEAD(&nn->nfs_volume_list); 1118 #if IS_ENABLED(CONFIG_NFS_V4) 1119 idr_init(&nn->cb_ident_idr); 1120 #endif 1121 spin_lock_init(&nn->nfs_client_lock); 1122 nn->boot_time = ktime_get_real(); 1123 1124 nfs_netns_sysfs_setup(nn, net); 1125 } 1126 1127 void nfs_clients_exit(struct net *net) 1128 { 1129 struct nfs_net *nn = net_generic(net, nfs_net_id); 1130 1131 nfs_netns_sysfs_destroy(nn); 1132 nfs_cleanup_cb_ident_idr(net); 1133 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1134 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1135 } 1136 1137 #ifdef CONFIG_PROC_FS 1138 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1139 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1140 static void nfs_server_list_stop(struct seq_file *p, void *v); 1141 static int nfs_server_list_show(struct seq_file *m, void *v); 1142 1143 static const struct seq_operations nfs_server_list_ops = { 1144 .start = nfs_server_list_start, 1145 .next = nfs_server_list_next, 1146 .stop = nfs_server_list_stop, 1147 .show = nfs_server_list_show, 1148 }; 1149 1150 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1151 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1152 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1153 static int nfs_volume_list_show(struct seq_file *m, void *v); 1154 1155 static const struct seq_operations nfs_volume_list_ops = { 1156 .start = nfs_volume_list_start, 1157 .next = nfs_volume_list_next, 1158 .stop = nfs_volume_list_stop, 1159 .show = nfs_volume_list_show, 1160 }; 1161 1162 /* 1163 * set up the iterator to start reading from the server list and return the first item 1164 */ 1165 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1166 __acquires(&nn->nfs_client_lock) 1167 { 1168 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1169 1170 /* lock the list against modification */ 1171 spin_lock(&nn->nfs_client_lock); 1172 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1173 } 1174 1175 /* 1176 * move to next server 1177 */ 1178 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1179 { 1180 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1181 1182 return seq_list_next(v, &nn->nfs_client_list, pos); 1183 } 1184 1185 /* 1186 * clean up after reading from the transports list 1187 */ 1188 static void nfs_server_list_stop(struct seq_file *p, void *v) 1189 __releases(&nn->nfs_client_lock) 1190 { 1191 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1192 1193 spin_unlock(&nn->nfs_client_lock); 1194 } 1195 1196 /* 1197 * display a header line followed by a load of call lines 1198 */ 1199 static int nfs_server_list_show(struct seq_file *m, void *v) 1200 { 1201 struct nfs_client *clp; 1202 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1203 1204 /* display header on line 1 */ 1205 if (v == &nn->nfs_client_list) { 1206 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1207 return 0; 1208 } 1209 1210 /* display one transport per line on subsequent lines */ 1211 clp = list_entry(v, struct nfs_client, cl_share_link); 1212 1213 /* Check if the client is initialized */ 1214 if (clp->cl_cons_state != NFS_CS_READY) 1215 return 0; 1216 1217 rcu_read_lock(); 1218 seq_printf(m, "v%u %s %s %3d %s\n", 1219 clp->rpc_ops->version, 1220 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1221 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1222 refcount_read(&clp->cl_count), 1223 clp->cl_hostname); 1224 rcu_read_unlock(); 1225 1226 return 0; 1227 } 1228 1229 /* 1230 * set up the iterator to start reading from the volume list and return the first item 1231 */ 1232 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1233 __acquires(&nn->nfs_client_lock) 1234 { 1235 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1236 1237 /* lock the list against modification */ 1238 spin_lock(&nn->nfs_client_lock); 1239 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1240 } 1241 1242 /* 1243 * move to next volume 1244 */ 1245 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1246 { 1247 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1248 1249 return seq_list_next(v, &nn->nfs_volume_list, pos); 1250 } 1251 1252 /* 1253 * clean up after reading from the transports list 1254 */ 1255 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1256 __releases(&nn->nfs_client_lock) 1257 { 1258 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1259 1260 spin_unlock(&nn->nfs_client_lock); 1261 } 1262 1263 /* 1264 * display a header line followed by a load of call lines 1265 */ 1266 static int nfs_volume_list_show(struct seq_file *m, void *v) 1267 { 1268 struct nfs_server *server; 1269 struct nfs_client *clp; 1270 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1271 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1272 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1273 1274 /* display header on line 1 */ 1275 if (v == &nn->nfs_volume_list) { 1276 seq_puts(m, "NV SERVER PORT DEV FSID" 1277 " FSC\n"); 1278 return 0; 1279 } 1280 /* display one transport per line on subsequent lines */ 1281 server = list_entry(v, struct nfs_server, master_link); 1282 clp = server->nfs_client; 1283 1284 snprintf(dev, sizeof(dev), "%u:%u", 1285 MAJOR(server->s_dev), MINOR(server->s_dev)); 1286 1287 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1288 (unsigned long long) server->fsid.major, 1289 (unsigned long long) server->fsid.minor); 1290 1291 rcu_read_lock(); 1292 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1293 clp->rpc_ops->version, 1294 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1295 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1296 dev, 1297 fsid, 1298 nfs_server_fscache_state(server)); 1299 rcu_read_unlock(); 1300 1301 return 0; 1302 } 1303 1304 int nfs_fs_proc_net_init(struct net *net) 1305 { 1306 struct nfs_net *nn = net_generic(net, nfs_net_id); 1307 struct proc_dir_entry *p; 1308 1309 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1310 if (!nn->proc_nfsfs) 1311 goto error_0; 1312 1313 /* a file of servers with which we're dealing */ 1314 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1315 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1316 if (!p) 1317 goto error_1; 1318 1319 /* a file of volumes that we have mounted */ 1320 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1321 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1322 if (!p) 1323 goto error_1; 1324 return 0; 1325 1326 error_1: 1327 remove_proc_subtree("nfsfs", net->proc_net); 1328 error_0: 1329 return -ENOMEM; 1330 } 1331 1332 void nfs_fs_proc_net_exit(struct net *net) 1333 { 1334 remove_proc_subtree("nfsfs", net->proc_net); 1335 } 1336 1337 /* 1338 * initialise the /proc/fs/nfsfs/ directory 1339 */ 1340 int __init nfs_fs_proc_init(void) 1341 { 1342 if (!proc_mkdir("fs/nfsfs", NULL)) 1343 goto error_0; 1344 1345 /* a file of servers with which we're dealing */ 1346 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1347 goto error_1; 1348 1349 /* a file of volumes that we have mounted */ 1350 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1351 goto error_1; 1352 1353 return 0; 1354 error_1: 1355 remove_proc_subtree("fs/nfsfs", NULL); 1356 error_0: 1357 return -ENOMEM; 1358 } 1359 1360 /* 1361 * clean up the /proc/fs/nfsfs/ directory 1362 */ 1363 void nfs_fs_proc_exit(void) 1364 { 1365 remove_proc_subtree("fs/nfsfs", NULL); 1366 } 1367 1368 #endif /* CONFIG_PROC_FS */ 1369