1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/addr.h> 24 #include <linux/sunrpc/clnt.h> 25 #include <linux/sunrpc/stats.h> 26 #include <linux/sunrpc/metrics.h> 27 #include <linux/sunrpc/xprtsock.h> 28 #include <linux/sunrpc/xprtrdma.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <linux/idr.h> 40 #include <net/ipv6.h> 41 #include <linux/nfs_xdr.h> 42 #include <linux/sunrpc/bc_xprt.h> 43 #include <linux/nsproxy.h> 44 #include <linux/pid_namespace.h> 45 46 47 #include "nfs4_fs.h" 48 #include "callback.h" 49 #include "delegation.h" 50 #include "iostat.h" 51 #include "internal.h" 52 #include "fscache.h" 53 #include "pnfs.h" 54 #include "nfs.h" 55 #include "netns.h" 56 57 #define NFSDBG_FACILITY NFSDBG_CLIENT 58 59 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 60 static DEFINE_SPINLOCK(nfs_version_lock); 61 static DEFINE_MUTEX(nfs_version_mutex); 62 static LIST_HEAD(nfs_versions); 63 64 /* 65 * RPC cruft for NFS 66 */ 67 static const struct rpc_version *nfs_version[5] = { 68 [2] = NULL, 69 [3] = NULL, 70 [4] = NULL, 71 }; 72 73 const struct rpc_program nfs_program = { 74 .name = "nfs", 75 .number = NFS_PROGRAM, 76 .nrvers = ARRAY_SIZE(nfs_version), 77 .version = nfs_version, 78 .stats = &nfs_rpcstat, 79 .pipe_dir_name = NFS_PIPE_DIRNAME, 80 }; 81 82 struct rpc_stat nfs_rpcstat = { 83 .program = &nfs_program 84 }; 85 86 static struct nfs_subversion *find_nfs_version(unsigned int version) 87 { 88 struct nfs_subversion *nfs; 89 spin_lock(&nfs_version_lock); 90 91 list_for_each_entry(nfs, &nfs_versions, list) { 92 if (nfs->rpc_ops->version == version) { 93 spin_unlock(&nfs_version_lock); 94 return nfs; 95 } 96 } 97 98 spin_unlock(&nfs_version_lock); 99 return ERR_PTR(-EPROTONOSUPPORT); 100 } 101 102 struct nfs_subversion *get_nfs_version(unsigned int version) 103 { 104 struct nfs_subversion *nfs = find_nfs_version(version); 105 106 if (IS_ERR(nfs)) { 107 mutex_lock(&nfs_version_mutex); 108 request_module("nfsv%d", version); 109 nfs = find_nfs_version(version); 110 mutex_unlock(&nfs_version_mutex); 111 } 112 113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 114 return ERR_PTR(-EAGAIN); 115 return nfs; 116 } 117 118 void put_nfs_version(struct nfs_subversion *nfs) 119 { 120 module_put(nfs->owner); 121 } 122 123 void register_nfs_version(struct nfs_subversion *nfs) 124 { 125 spin_lock(&nfs_version_lock); 126 127 list_add(&nfs->list, &nfs_versions); 128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 129 130 spin_unlock(&nfs_version_lock); 131 } 132 EXPORT_SYMBOL_GPL(register_nfs_version); 133 134 void unregister_nfs_version(struct nfs_subversion *nfs) 135 { 136 spin_lock(&nfs_version_lock); 137 138 nfs_version[nfs->rpc_ops->version] = NULL; 139 list_del(&nfs->list); 140 141 spin_unlock(&nfs_version_lock); 142 } 143 EXPORT_SYMBOL_GPL(unregister_nfs_version); 144 145 /* 146 * Allocate a shared client record 147 * 148 * Since these are allocated/deallocated very rarely, we don't 149 * bother putting them in a slab cache... 150 */ 151 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 152 { 153 struct nfs_client *clp; 154 struct rpc_cred *cred; 155 int err = -ENOMEM; 156 157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 158 goto error_0; 159 160 clp->cl_nfs_mod = cl_init->nfs_mod; 161 if (!try_module_get(clp->cl_nfs_mod->owner)) 162 goto error_dealloc; 163 164 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 165 166 atomic_set(&clp->cl_count, 1); 167 clp->cl_cons_state = NFS_CS_INITING; 168 169 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 170 clp->cl_addrlen = cl_init->addrlen; 171 172 if (cl_init->hostname) { 173 err = -ENOMEM; 174 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 175 if (!clp->cl_hostname) 176 goto error_cleanup; 177 } 178 179 INIT_LIST_HEAD(&clp->cl_superblocks); 180 clp->cl_rpcclient = ERR_PTR(-EINVAL); 181 182 clp->cl_proto = cl_init->proto; 183 clp->cl_net = get_net(cl_init->net); 184 185 cred = rpc_lookup_machine_cred("*"); 186 if (!IS_ERR(cred)) 187 clp->cl_machine_cred = cred; 188 nfs_fscache_get_client_cookie(clp); 189 190 return clp; 191 192 error_cleanup: 193 put_nfs_version(clp->cl_nfs_mod); 194 error_dealloc: 195 kfree(clp); 196 error_0: 197 return ERR_PTR(err); 198 } 199 EXPORT_SYMBOL_GPL(nfs_alloc_client); 200 201 #if IS_ENABLED(CONFIG_NFS_V4) 202 void nfs_cleanup_cb_ident_idr(struct net *net) 203 { 204 struct nfs_net *nn = net_generic(net, nfs_net_id); 205 206 idr_destroy(&nn->cb_ident_idr); 207 } 208 209 /* nfs_client_lock held */ 210 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 211 { 212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 213 214 if (clp->cl_cb_ident) 215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 216 } 217 218 static void pnfs_init_server(struct nfs_server *server) 219 { 220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 221 } 222 223 #else 224 void nfs_cleanup_cb_ident_idr(struct net *net) 225 { 226 } 227 228 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 229 { 230 } 231 232 static void pnfs_init_server(struct nfs_server *server) 233 { 234 } 235 236 #endif /* CONFIG_NFS_V4 */ 237 238 /* 239 * Destroy a shared client record 240 */ 241 void nfs_free_client(struct nfs_client *clp) 242 { 243 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 244 245 nfs_fscache_release_client_cookie(clp); 246 247 /* -EIO all pending I/O */ 248 if (!IS_ERR(clp->cl_rpcclient)) 249 rpc_shutdown_client(clp->cl_rpcclient); 250 251 if (clp->cl_machine_cred != NULL) 252 put_rpccred(clp->cl_machine_cred); 253 254 put_net(clp->cl_net); 255 put_nfs_version(clp->cl_nfs_mod); 256 kfree(clp->cl_hostname); 257 kfree(clp->cl_acceptor); 258 kfree(clp); 259 260 dprintk("<-- nfs_free_client()\n"); 261 } 262 EXPORT_SYMBOL_GPL(nfs_free_client); 263 264 /* 265 * Release a reference to a shared client record 266 */ 267 void nfs_put_client(struct nfs_client *clp) 268 { 269 struct nfs_net *nn; 270 271 if (!clp) 272 return; 273 274 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 275 nn = net_generic(clp->cl_net, nfs_net_id); 276 277 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 278 list_del(&clp->cl_share_link); 279 nfs_cb_idr_remove_locked(clp); 280 spin_unlock(&nn->nfs_client_lock); 281 282 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 283 284 clp->rpc_ops->free_client(clp); 285 } 286 } 287 EXPORT_SYMBOL_GPL(nfs_put_client); 288 289 /* 290 * Find an nfs_client on the list that matches the initialisation data 291 * that is supplied. 292 */ 293 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 294 { 295 struct nfs_client *clp; 296 const struct sockaddr *sap = data->addr; 297 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 298 299 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 300 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 301 /* Don't match clients that failed to initialise properly */ 302 if (clp->cl_cons_state < 0) 303 continue; 304 305 /* Different NFS versions cannot share the same nfs_client */ 306 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 307 continue; 308 309 if (clp->cl_proto != data->proto) 310 continue; 311 /* Match nfsv4 minorversion */ 312 if (clp->cl_minorversion != data->minorversion) 313 continue; 314 /* Match the full socket address */ 315 if (!rpc_cmp_addr_port(sap, clap)) 316 /* Match all xprt_switch full socket addresses */ 317 if (!rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 318 sap)) 319 continue; 320 321 atomic_inc(&clp->cl_count); 322 return clp; 323 } 324 return NULL; 325 } 326 327 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 328 { 329 return clp->cl_cons_state <= NFS_CS_READY; 330 } 331 332 int nfs_wait_client_init_complete(const struct nfs_client *clp) 333 { 334 return wait_event_killable(nfs_client_active_wq, 335 nfs_client_init_is_complete(clp)); 336 } 337 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 338 339 /* 340 * Found an existing client. Make sure it's ready before returning. 341 */ 342 static struct nfs_client * 343 nfs_found_client(const struct nfs_client_initdata *cl_init, 344 struct nfs_client *clp) 345 { 346 int error; 347 348 error = nfs_wait_client_init_complete(clp); 349 if (error < 0) { 350 nfs_put_client(clp); 351 return ERR_PTR(-ERESTARTSYS); 352 } 353 354 if (clp->cl_cons_state < NFS_CS_READY) { 355 error = clp->cl_cons_state; 356 nfs_put_client(clp); 357 return ERR_PTR(error); 358 } 359 360 smp_rmb(); 361 362 dprintk("<-- %s found nfs_client %p for %s\n", 363 __func__, clp, cl_init->hostname ?: ""); 364 return clp; 365 } 366 367 /* 368 * Look up a client by IP address and protocol version 369 * - creates a new record if one doesn't yet exist 370 */ 371 struct nfs_client * 372 nfs_get_client(const struct nfs_client_initdata *cl_init, 373 rpc_authflavor_t authflavour) 374 { 375 struct nfs_client *clp, *new = NULL; 376 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 377 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 378 379 if (cl_init->hostname == NULL) { 380 WARN_ON(1); 381 return NULL; 382 } 383 384 dprintk("--> nfs_get_client(%s,v%u)\n", 385 cl_init->hostname, rpc_ops->version); 386 387 /* see if the client already exists */ 388 do { 389 spin_lock(&nn->nfs_client_lock); 390 391 clp = nfs_match_client(cl_init); 392 if (clp) { 393 spin_unlock(&nn->nfs_client_lock); 394 if (new) 395 new->rpc_ops->free_client(new); 396 return nfs_found_client(cl_init, clp); 397 } 398 if (new) { 399 list_add_tail(&new->cl_share_link, 400 &nn->nfs_client_list); 401 spin_unlock(&nn->nfs_client_lock); 402 new->cl_flags = cl_init->init_flags; 403 return rpc_ops->init_client(new, cl_init); 404 } 405 406 spin_unlock(&nn->nfs_client_lock); 407 408 new = rpc_ops->alloc_client(cl_init); 409 } while (!IS_ERR(new)); 410 411 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 412 cl_init->hostname, PTR_ERR(new)); 413 return new; 414 } 415 EXPORT_SYMBOL_GPL(nfs_get_client); 416 417 /* 418 * Mark a server as ready or failed 419 */ 420 void nfs_mark_client_ready(struct nfs_client *clp, int state) 421 { 422 smp_wmb(); 423 clp->cl_cons_state = state; 424 wake_up_all(&nfs_client_active_wq); 425 } 426 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 427 428 /* 429 * Initialise the timeout values for a connection 430 */ 431 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 432 int timeo, int retrans) 433 { 434 to->to_initval = timeo * HZ / 10; 435 to->to_retries = retrans; 436 437 switch (proto) { 438 case XPRT_TRANSPORT_TCP: 439 case XPRT_TRANSPORT_RDMA: 440 if (retrans == NFS_UNSPEC_RETRANS) 441 to->to_retries = NFS_DEF_TCP_RETRANS; 442 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0) 443 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 444 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 445 to->to_initval = NFS_MAX_TCP_TIMEOUT; 446 to->to_increment = to->to_initval; 447 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 448 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 449 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 450 if (to->to_maxval < to->to_initval) 451 to->to_maxval = to->to_initval; 452 to->to_exponential = 0; 453 break; 454 case XPRT_TRANSPORT_UDP: 455 if (retrans == NFS_UNSPEC_RETRANS) 456 to->to_retries = NFS_DEF_UDP_RETRANS; 457 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 458 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 459 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 460 to->to_initval = NFS_MAX_UDP_TIMEOUT; 461 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 462 to->to_exponential = 1; 463 break; 464 default: 465 BUG(); 466 } 467 } 468 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 469 470 /* 471 * Create an RPC client handle 472 */ 473 int nfs_create_rpc_client(struct nfs_client *clp, 474 const struct nfs_client_initdata *cl_init, 475 rpc_authflavor_t flavor) 476 { 477 struct rpc_clnt *clnt = NULL; 478 struct rpc_create_args args = { 479 .net = clp->cl_net, 480 .protocol = clp->cl_proto, 481 .address = (struct sockaddr *)&clp->cl_addr, 482 .addrsize = clp->cl_addrlen, 483 .timeout = cl_init->timeparms, 484 .servername = clp->cl_hostname, 485 .nodename = cl_init->nodename, 486 .program = &nfs_program, 487 .version = clp->rpc_ops->version, 488 .authflavor = flavor, 489 }; 490 491 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 492 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 493 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 494 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 495 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 496 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 497 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 498 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 499 500 if (!IS_ERR(clp->cl_rpcclient)) 501 return 0; 502 503 clnt = rpc_create(&args); 504 if (IS_ERR(clnt)) { 505 dprintk("%s: cannot create RPC client. Error = %ld\n", 506 __func__, PTR_ERR(clnt)); 507 return PTR_ERR(clnt); 508 } 509 510 clp->cl_rpcclient = clnt; 511 return 0; 512 } 513 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 514 515 /* 516 * Version 2 or 3 client destruction 517 */ 518 static void nfs_destroy_server(struct nfs_server *server) 519 { 520 if (server->nlm_host) 521 nlmclnt_done(server->nlm_host); 522 } 523 524 /* 525 * Version 2 or 3 lockd setup 526 */ 527 static int nfs_start_lockd(struct nfs_server *server) 528 { 529 struct nlm_host *host; 530 struct nfs_client *clp = server->nfs_client; 531 struct nlmclnt_initdata nlm_init = { 532 .hostname = clp->cl_hostname, 533 .address = (struct sockaddr *)&clp->cl_addr, 534 .addrlen = clp->cl_addrlen, 535 .nfs_version = clp->rpc_ops->version, 536 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 537 1 : 0, 538 .net = clp->cl_net, 539 }; 540 541 if (nlm_init.nfs_version > 3) 542 return 0; 543 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 544 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 545 return 0; 546 547 switch (clp->cl_proto) { 548 default: 549 nlm_init.protocol = IPPROTO_TCP; 550 break; 551 case XPRT_TRANSPORT_UDP: 552 nlm_init.protocol = IPPROTO_UDP; 553 } 554 555 host = nlmclnt_init(&nlm_init); 556 if (IS_ERR(host)) 557 return PTR_ERR(host); 558 559 server->nlm_host = host; 560 server->destroy = nfs_destroy_server; 561 return 0; 562 } 563 564 /* 565 * Create a general RPC client 566 */ 567 int nfs_init_server_rpcclient(struct nfs_server *server, 568 const struct rpc_timeout *timeo, 569 rpc_authflavor_t pseudoflavour) 570 { 571 struct nfs_client *clp = server->nfs_client; 572 573 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 574 pseudoflavour); 575 if (IS_ERR(server->client)) { 576 dprintk("%s: couldn't create rpc_client!\n", __func__); 577 return PTR_ERR(server->client); 578 } 579 580 memcpy(&server->client->cl_timeout_default, 581 timeo, 582 sizeof(server->client->cl_timeout_default)); 583 server->client->cl_timeout = &server->client->cl_timeout_default; 584 server->client->cl_softrtry = 0; 585 if (server->flags & NFS_MOUNT_SOFT) 586 server->client->cl_softrtry = 1; 587 588 return 0; 589 } 590 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 591 592 /** 593 * nfs_init_client - Initialise an NFS2 or NFS3 client 594 * 595 * @clp: nfs_client to initialise 596 * @cl_init: Initialisation parameters 597 * 598 * Returns pointer to an NFS client, or an ERR_PTR value. 599 */ 600 struct nfs_client *nfs_init_client(struct nfs_client *clp, 601 const struct nfs_client_initdata *cl_init) 602 { 603 int error; 604 605 if (clp->cl_cons_state == NFS_CS_READY) { 606 /* the client is already initialised */ 607 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 608 return clp; 609 } 610 611 /* 612 * Create a client RPC handle for doing FSSTAT with UNIX auth only 613 * - RFC 2623, sec 2.3.2 614 */ 615 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 616 if (error < 0) 617 goto error; 618 nfs_mark_client_ready(clp, NFS_CS_READY); 619 return clp; 620 621 error: 622 nfs_mark_client_ready(clp, error); 623 nfs_put_client(clp); 624 dprintk("<-- nfs_init_client() = xerror %d\n", error); 625 return ERR_PTR(error); 626 } 627 EXPORT_SYMBOL_GPL(nfs_init_client); 628 629 /* 630 * Create a version 2 or 3 client 631 */ 632 static int nfs_init_server(struct nfs_server *server, 633 const struct nfs_parsed_mount_data *data, 634 struct nfs_subversion *nfs_mod) 635 { 636 struct rpc_timeout timeparms; 637 struct nfs_client_initdata cl_init = { 638 .hostname = data->nfs_server.hostname, 639 .addr = (const struct sockaddr *)&data->nfs_server.address, 640 .addrlen = data->nfs_server.addrlen, 641 .nfs_mod = nfs_mod, 642 .proto = data->nfs_server.protocol, 643 .net = data->net, 644 .timeparms = &timeparms, 645 }; 646 struct nfs_client *clp; 647 int error; 648 649 dprintk("--> nfs_init_server()\n"); 650 651 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 652 data->timeo, data->retrans); 653 if (data->flags & NFS_MOUNT_NORESVPORT) 654 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 655 656 /* Allocate or find a client reference we can use */ 657 clp = nfs_get_client(&cl_init, RPC_AUTH_UNIX); 658 if (IS_ERR(clp)) { 659 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 660 return PTR_ERR(clp); 661 } 662 663 server->nfs_client = clp; 664 665 /* Initialise the client representation from the mount data */ 666 server->flags = data->flags; 667 server->options = data->options; 668 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 669 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 670 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 671 672 if (data->rsize) 673 server->rsize = nfs_block_size(data->rsize, NULL); 674 if (data->wsize) 675 server->wsize = nfs_block_size(data->wsize, NULL); 676 677 server->acregmin = data->acregmin * HZ; 678 server->acregmax = data->acregmax * HZ; 679 server->acdirmin = data->acdirmin * HZ; 680 server->acdirmax = data->acdirmax * HZ; 681 682 /* Start lockd here, before we might error out */ 683 error = nfs_start_lockd(server); 684 if (error < 0) 685 goto error; 686 687 server->port = data->nfs_server.port; 688 server->auth_info = data->auth_info; 689 690 error = nfs_init_server_rpcclient(server, &timeparms, 691 data->selected_flavor); 692 if (error < 0) 693 goto error; 694 695 /* Preserve the values of mount_server-related mount options */ 696 if (data->mount_server.addrlen) { 697 memcpy(&server->mountd_address, &data->mount_server.address, 698 data->mount_server.addrlen); 699 server->mountd_addrlen = data->mount_server.addrlen; 700 } 701 server->mountd_version = data->mount_server.version; 702 server->mountd_port = data->mount_server.port; 703 server->mountd_protocol = data->mount_server.protocol; 704 705 server->namelen = data->namlen; 706 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 707 return 0; 708 709 error: 710 server->nfs_client = NULL; 711 nfs_put_client(clp); 712 dprintk("<-- nfs_init_server() = xerror %d\n", error); 713 return error; 714 } 715 716 /* 717 * Load up the server record from information gained in an fsinfo record 718 */ 719 static void nfs_server_set_fsinfo(struct nfs_server *server, 720 struct nfs_fsinfo *fsinfo) 721 { 722 unsigned long max_rpc_payload; 723 724 /* Work out a lot of parameters */ 725 if (server->rsize == 0) 726 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 727 if (server->wsize == 0) 728 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 729 730 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 731 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 732 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 733 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 734 735 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 736 if (server->rsize > max_rpc_payload) 737 server->rsize = max_rpc_payload; 738 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 739 server->rsize = NFS_MAX_FILE_IO_SIZE; 740 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 741 742 server->backing_dev_info.name = "nfs"; 743 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 744 745 if (server->wsize > max_rpc_payload) 746 server->wsize = max_rpc_payload; 747 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 748 server->wsize = NFS_MAX_FILE_IO_SIZE; 749 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 750 751 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 752 753 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 754 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 755 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 756 if (server->dtsize > server->rsize) 757 server->dtsize = server->rsize; 758 759 if (server->flags & NFS_MOUNT_NOAC) { 760 server->acregmin = server->acregmax = 0; 761 server->acdirmin = server->acdirmax = 0; 762 } 763 764 server->maxfilesize = fsinfo->maxfilesize; 765 766 server->time_delta = fsinfo->time_delta; 767 768 server->clone_blksize = fsinfo->clone_blksize; 769 /* We're airborne Set socket buffersize */ 770 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 771 } 772 773 /* 774 * Probe filesystem information, including the FSID on v2/v3 775 */ 776 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 777 { 778 struct nfs_fsinfo fsinfo; 779 struct nfs_client *clp = server->nfs_client; 780 int error; 781 782 dprintk("--> nfs_probe_fsinfo()\n"); 783 784 if (clp->rpc_ops->set_capabilities != NULL) { 785 error = clp->rpc_ops->set_capabilities(server, mntfh); 786 if (error < 0) 787 goto out_error; 788 } 789 790 fsinfo.fattr = fattr; 791 fsinfo.nlayouttypes = 0; 792 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 793 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 794 if (error < 0) 795 goto out_error; 796 797 nfs_server_set_fsinfo(server, &fsinfo); 798 799 /* Get some general file system info */ 800 if (server->namelen == 0) { 801 struct nfs_pathconf pathinfo; 802 803 pathinfo.fattr = fattr; 804 nfs_fattr_init(fattr); 805 806 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 807 server->namelen = pathinfo.max_namelen; 808 } 809 810 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 811 return 0; 812 813 out_error: 814 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 815 return error; 816 } 817 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 818 819 /* 820 * Copy useful information when duplicating a server record 821 */ 822 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 823 { 824 target->flags = source->flags; 825 target->rsize = source->rsize; 826 target->wsize = source->wsize; 827 target->acregmin = source->acregmin; 828 target->acregmax = source->acregmax; 829 target->acdirmin = source->acdirmin; 830 target->acdirmax = source->acdirmax; 831 target->caps = source->caps; 832 target->options = source->options; 833 target->auth_info = source->auth_info; 834 } 835 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 836 837 void nfs_server_insert_lists(struct nfs_server *server) 838 { 839 struct nfs_client *clp = server->nfs_client; 840 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 841 842 spin_lock(&nn->nfs_client_lock); 843 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 844 list_add_tail(&server->master_link, &nn->nfs_volume_list); 845 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 846 spin_unlock(&nn->nfs_client_lock); 847 848 } 849 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 850 851 void nfs_server_remove_lists(struct nfs_server *server) 852 { 853 struct nfs_client *clp = server->nfs_client; 854 struct nfs_net *nn; 855 856 if (clp == NULL) 857 return; 858 nn = net_generic(clp->cl_net, nfs_net_id); 859 spin_lock(&nn->nfs_client_lock); 860 list_del_rcu(&server->client_link); 861 if (list_empty(&clp->cl_superblocks)) 862 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 863 list_del(&server->master_link); 864 spin_unlock(&nn->nfs_client_lock); 865 866 synchronize_rcu(); 867 } 868 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 869 870 /* 871 * Allocate and initialise a server record 872 */ 873 struct nfs_server *nfs_alloc_server(void) 874 { 875 struct nfs_server *server; 876 877 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 878 if (!server) 879 return NULL; 880 881 server->client = server->client_acl = ERR_PTR(-EINVAL); 882 883 /* Zero out the NFS state stuff */ 884 INIT_LIST_HEAD(&server->client_link); 885 INIT_LIST_HEAD(&server->master_link); 886 INIT_LIST_HEAD(&server->delegations); 887 INIT_LIST_HEAD(&server->layouts); 888 INIT_LIST_HEAD(&server->state_owners_lru); 889 890 atomic_set(&server->active, 0); 891 892 server->io_stats = nfs_alloc_iostats(); 893 if (!server->io_stats) { 894 kfree(server); 895 return NULL; 896 } 897 898 if (bdi_init(&server->backing_dev_info)) { 899 nfs_free_iostats(server->io_stats); 900 kfree(server); 901 return NULL; 902 } 903 904 ida_init(&server->openowner_id); 905 ida_init(&server->lockowner_id); 906 pnfs_init_server(server); 907 908 return server; 909 } 910 EXPORT_SYMBOL_GPL(nfs_alloc_server); 911 912 /* 913 * Free up a server record 914 */ 915 void nfs_free_server(struct nfs_server *server) 916 { 917 dprintk("--> nfs_free_server()\n"); 918 919 nfs_server_remove_lists(server); 920 921 if (server->destroy != NULL) 922 server->destroy(server); 923 924 if (!IS_ERR(server->client_acl)) 925 rpc_shutdown_client(server->client_acl); 926 if (!IS_ERR(server->client)) 927 rpc_shutdown_client(server->client); 928 929 nfs_put_client(server->nfs_client); 930 931 ida_destroy(&server->lockowner_id); 932 ida_destroy(&server->openowner_id); 933 nfs_free_iostats(server->io_stats); 934 bdi_destroy(&server->backing_dev_info); 935 kfree(server); 936 nfs_release_automount_timer(); 937 dprintk("<-- nfs_free_server()\n"); 938 } 939 EXPORT_SYMBOL_GPL(nfs_free_server); 940 941 /* 942 * Create a version 2 or 3 volume record 943 * - keyed on server and FSID 944 */ 945 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 946 struct nfs_subversion *nfs_mod) 947 { 948 struct nfs_server *server; 949 struct nfs_fattr *fattr; 950 int error; 951 952 server = nfs_alloc_server(); 953 if (!server) 954 return ERR_PTR(-ENOMEM); 955 956 error = -ENOMEM; 957 fattr = nfs_alloc_fattr(); 958 if (fattr == NULL) 959 goto error; 960 961 /* Get a client representation */ 962 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 963 if (error < 0) 964 goto error; 965 966 /* Probe the root fh to retrieve its FSID */ 967 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 968 if (error < 0) 969 goto error; 970 if (server->nfs_client->rpc_ops->version == 3) { 971 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 972 server->namelen = NFS3_MAXNAMLEN; 973 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 974 server->caps |= NFS_CAP_READDIRPLUS; 975 } else { 976 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 977 server->namelen = NFS2_MAXNAMLEN; 978 } 979 980 if (!(fattr->valid & NFS_ATTR_FATTR)) { 981 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 982 if (error < 0) { 983 dprintk("nfs_create_server: getattr error = %d\n", -error); 984 goto error; 985 } 986 } 987 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 988 989 dprintk("Server FSID: %llx:%llx\n", 990 (unsigned long long) server->fsid.major, 991 (unsigned long long) server->fsid.minor); 992 993 nfs_server_insert_lists(server); 994 server->mount_time = jiffies; 995 nfs_free_fattr(fattr); 996 return server; 997 998 error: 999 nfs_free_fattr(fattr); 1000 nfs_free_server(server); 1001 return ERR_PTR(error); 1002 } 1003 EXPORT_SYMBOL_GPL(nfs_create_server); 1004 1005 /* 1006 * Clone an NFS2, NFS3 or NFS4 server record 1007 */ 1008 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1009 struct nfs_fh *fh, 1010 struct nfs_fattr *fattr, 1011 rpc_authflavor_t flavor) 1012 { 1013 struct nfs_server *server; 1014 struct nfs_fattr *fattr_fsinfo; 1015 int error; 1016 1017 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1018 (unsigned long long) fattr->fsid.major, 1019 (unsigned long long) fattr->fsid.minor); 1020 1021 server = nfs_alloc_server(); 1022 if (!server) 1023 return ERR_PTR(-ENOMEM); 1024 1025 error = -ENOMEM; 1026 fattr_fsinfo = nfs_alloc_fattr(); 1027 if (fattr_fsinfo == NULL) 1028 goto out_free_server; 1029 1030 /* Copy data from the source */ 1031 server->nfs_client = source->nfs_client; 1032 server->destroy = source->destroy; 1033 atomic_inc(&server->nfs_client->cl_count); 1034 nfs_server_copy_userdata(server, source); 1035 1036 server->fsid = fattr->fsid; 1037 1038 error = nfs_init_server_rpcclient(server, 1039 source->client->cl_timeout, 1040 flavor); 1041 if (error < 0) 1042 goto out_free_server; 1043 1044 /* probe the filesystem info for this server filesystem */ 1045 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1046 if (error < 0) 1047 goto out_free_server; 1048 1049 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1050 server->namelen = NFS4_MAXNAMLEN; 1051 1052 dprintk("Cloned FSID: %llx:%llx\n", 1053 (unsigned long long) server->fsid.major, 1054 (unsigned long long) server->fsid.minor); 1055 1056 error = nfs_start_lockd(server); 1057 if (error < 0) 1058 goto out_free_server; 1059 1060 nfs_server_insert_lists(server); 1061 server->mount_time = jiffies; 1062 1063 nfs_free_fattr(fattr_fsinfo); 1064 dprintk("<-- nfs_clone_server() = %p\n", server); 1065 return server; 1066 1067 out_free_server: 1068 nfs_free_fattr(fattr_fsinfo); 1069 nfs_free_server(server); 1070 dprintk("<-- nfs_clone_server() = error %d\n", error); 1071 return ERR_PTR(error); 1072 } 1073 EXPORT_SYMBOL_GPL(nfs_clone_server); 1074 1075 void nfs_clients_init(struct net *net) 1076 { 1077 struct nfs_net *nn = net_generic(net, nfs_net_id); 1078 1079 INIT_LIST_HEAD(&nn->nfs_client_list); 1080 INIT_LIST_HEAD(&nn->nfs_volume_list); 1081 #if IS_ENABLED(CONFIG_NFS_V4) 1082 idr_init(&nn->cb_ident_idr); 1083 #endif 1084 spin_lock_init(&nn->nfs_client_lock); 1085 nn->boot_time = ktime_get_real(); 1086 } 1087 1088 #ifdef CONFIG_PROC_FS 1089 static int nfs_server_list_open(struct inode *inode, struct file *file); 1090 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1091 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1092 static void nfs_server_list_stop(struct seq_file *p, void *v); 1093 static int nfs_server_list_show(struct seq_file *m, void *v); 1094 1095 static const struct seq_operations nfs_server_list_ops = { 1096 .start = nfs_server_list_start, 1097 .next = nfs_server_list_next, 1098 .stop = nfs_server_list_stop, 1099 .show = nfs_server_list_show, 1100 }; 1101 1102 static const struct file_operations nfs_server_list_fops = { 1103 .open = nfs_server_list_open, 1104 .read = seq_read, 1105 .llseek = seq_lseek, 1106 .release = seq_release_net, 1107 }; 1108 1109 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1110 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1111 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1112 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1113 static int nfs_volume_list_show(struct seq_file *m, void *v); 1114 1115 static const struct seq_operations nfs_volume_list_ops = { 1116 .start = nfs_volume_list_start, 1117 .next = nfs_volume_list_next, 1118 .stop = nfs_volume_list_stop, 1119 .show = nfs_volume_list_show, 1120 }; 1121 1122 static const struct file_operations nfs_volume_list_fops = { 1123 .open = nfs_volume_list_open, 1124 .read = seq_read, 1125 .llseek = seq_lseek, 1126 .release = seq_release_net, 1127 }; 1128 1129 /* 1130 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1131 * we're dealing 1132 */ 1133 static int nfs_server_list_open(struct inode *inode, struct file *file) 1134 { 1135 return seq_open_net(inode, file, &nfs_server_list_ops, 1136 sizeof(struct seq_net_private)); 1137 } 1138 1139 /* 1140 * set up the iterator to start reading from the server list and return the first item 1141 */ 1142 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1143 __acquires(&nn->nfs_client_lock) 1144 { 1145 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1146 1147 /* lock the list against modification */ 1148 spin_lock(&nn->nfs_client_lock); 1149 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1150 } 1151 1152 /* 1153 * move to next server 1154 */ 1155 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1156 { 1157 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1158 1159 return seq_list_next(v, &nn->nfs_client_list, pos); 1160 } 1161 1162 /* 1163 * clean up after reading from the transports list 1164 */ 1165 static void nfs_server_list_stop(struct seq_file *p, void *v) 1166 __releases(&nn->nfs_client_lock) 1167 { 1168 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1169 1170 spin_unlock(&nn->nfs_client_lock); 1171 } 1172 1173 /* 1174 * display a header line followed by a load of call lines 1175 */ 1176 static int nfs_server_list_show(struct seq_file *m, void *v) 1177 { 1178 struct nfs_client *clp; 1179 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1180 1181 /* display header on line 1 */ 1182 if (v == &nn->nfs_client_list) { 1183 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1184 return 0; 1185 } 1186 1187 /* display one transport per line on subsequent lines */ 1188 clp = list_entry(v, struct nfs_client, cl_share_link); 1189 1190 /* Check if the client is initialized */ 1191 if (clp->cl_cons_state != NFS_CS_READY) 1192 return 0; 1193 1194 rcu_read_lock(); 1195 seq_printf(m, "v%u %s %s %3d %s\n", 1196 clp->rpc_ops->version, 1197 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1198 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1199 atomic_read(&clp->cl_count), 1200 clp->cl_hostname); 1201 rcu_read_unlock(); 1202 1203 return 0; 1204 } 1205 1206 /* 1207 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1208 */ 1209 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1210 { 1211 return seq_open_net(inode, file, &nfs_volume_list_ops, 1212 sizeof(struct seq_net_private)); 1213 } 1214 1215 /* 1216 * set up the iterator to start reading from the volume list and return the first item 1217 */ 1218 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1219 __acquires(&nn->nfs_client_lock) 1220 { 1221 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1222 1223 /* lock the list against modification */ 1224 spin_lock(&nn->nfs_client_lock); 1225 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1226 } 1227 1228 /* 1229 * move to next volume 1230 */ 1231 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1232 { 1233 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1234 1235 return seq_list_next(v, &nn->nfs_volume_list, pos); 1236 } 1237 1238 /* 1239 * clean up after reading from the transports list 1240 */ 1241 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1242 __releases(&nn->nfs_client_lock) 1243 { 1244 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1245 1246 spin_unlock(&nn->nfs_client_lock); 1247 } 1248 1249 /* 1250 * display a header line followed by a load of call lines 1251 */ 1252 static int nfs_volume_list_show(struct seq_file *m, void *v) 1253 { 1254 struct nfs_server *server; 1255 struct nfs_client *clp; 1256 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1257 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1258 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1259 1260 /* display header on line 1 */ 1261 if (v == &nn->nfs_volume_list) { 1262 seq_puts(m, "NV SERVER PORT DEV FSID" 1263 " FSC\n"); 1264 return 0; 1265 } 1266 /* display one transport per line on subsequent lines */ 1267 server = list_entry(v, struct nfs_server, master_link); 1268 clp = server->nfs_client; 1269 1270 snprintf(dev, sizeof(dev), "%u:%u", 1271 MAJOR(server->s_dev), MINOR(server->s_dev)); 1272 1273 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1274 (unsigned long long) server->fsid.major, 1275 (unsigned long long) server->fsid.minor); 1276 1277 rcu_read_lock(); 1278 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1279 clp->rpc_ops->version, 1280 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1281 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1282 dev, 1283 fsid, 1284 nfs_server_fscache_state(server)); 1285 rcu_read_unlock(); 1286 1287 return 0; 1288 } 1289 1290 int nfs_fs_proc_net_init(struct net *net) 1291 { 1292 struct nfs_net *nn = net_generic(net, nfs_net_id); 1293 struct proc_dir_entry *p; 1294 1295 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1296 if (!nn->proc_nfsfs) 1297 goto error_0; 1298 1299 /* a file of servers with which we're dealing */ 1300 p = proc_create("servers", S_IFREG|S_IRUGO, 1301 nn->proc_nfsfs, &nfs_server_list_fops); 1302 if (!p) 1303 goto error_1; 1304 1305 /* a file of volumes that we have mounted */ 1306 p = proc_create("volumes", S_IFREG|S_IRUGO, 1307 nn->proc_nfsfs, &nfs_volume_list_fops); 1308 if (!p) 1309 goto error_1; 1310 return 0; 1311 1312 error_1: 1313 remove_proc_subtree("nfsfs", net->proc_net); 1314 error_0: 1315 return -ENOMEM; 1316 } 1317 1318 void nfs_fs_proc_net_exit(struct net *net) 1319 { 1320 remove_proc_subtree("nfsfs", net->proc_net); 1321 } 1322 1323 /* 1324 * initialise the /proc/fs/nfsfs/ directory 1325 */ 1326 int __init nfs_fs_proc_init(void) 1327 { 1328 if (!proc_mkdir("fs/nfsfs", NULL)) 1329 goto error_0; 1330 1331 /* a file of servers with which we're dealing */ 1332 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1333 goto error_1; 1334 1335 /* a file of volumes that we have mounted */ 1336 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1337 goto error_1; 1338 1339 return 0; 1340 error_1: 1341 remove_proc_subtree("fs/nfsfs", NULL); 1342 error_0: 1343 return -ENOMEM; 1344 } 1345 1346 /* 1347 * clean up the /proc/fs/nfsfs/ directory 1348 */ 1349 void nfs_fs_proc_exit(void) 1350 { 1351 remove_proc_subtree("fs/nfsfs", NULL); 1352 } 1353 1354 #endif /* CONFIG_PROC_FS */ 1355