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 (IS_ERR(clp->cl_rpcclient) || 318 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 319 sap)) 320 continue; 321 322 atomic_inc(&clp->cl_count); 323 return clp; 324 } 325 return NULL; 326 } 327 328 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 329 { 330 return clp->cl_cons_state <= NFS_CS_READY; 331 } 332 333 int nfs_wait_client_init_complete(const struct nfs_client *clp) 334 { 335 return wait_event_killable(nfs_client_active_wq, 336 nfs_client_init_is_complete(clp)); 337 } 338 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 339 340 /* 341 * Found an existing client. Make sure it's ready before returning. 342 */ 343 static struct nfs_client * 344 nfs_found_client(const struct nfs_client_initdata *cl_init, 345 struct nfs_client *clp) 346 { 347 int error; 348 349 error = nfs_wait_client_init_complete(clp); 350 if (error < 0) { 351 nfs_put_client(clp); 352 return ERR_PTR(-ERESTARTSYS); 353 } 354 355 if (clp->cl_cons_state < NFS_CS_READY) { 356 error = clp->cl_cons_state; 357 nfs_put_client(clp); 358 return ERR_PTR(error); 359 } 360 361 smp_rmb(); 362 363 dprintk("<-- %s found nfs_client %p for %s\n", 364 __func__, clp, cl_init->hostname ?: ""); 365 return clp; 366 } 367 368 /* 369 * Look up a client by IP address and protocol version 370 * - creates a new record if one doesn't yet exist 371 */ 372 struct nfs_client * 373 nfs_get_client(const struct nfs_client_initdata *cl_init, 374 rpc_authflavor_t authflavour) 375 { 376 struct nfs_client *clp, *new = NULL; 377 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 378 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 379 380 if (cl_init->hostname == NULL) { 381 WARN_ON(1); 382 return NULL; 383 } 384 385 dprintk("--> nfs_get_client(%s,v%u)\n", 386 cl_init->hostname, rpc_ops->version); 387 388 /* see if the client already exists */ 389 do { 390 spin_lock(&nn->nfs_client_lock); 391 392 clp = nfs_match_client(cl_init); 393 if (clp) { 394 spin_unlock(&nn->nfs_client_lock); 395 if (new) 396 new->rpc_ops->free_client(new); 397 return nfs_found_client(cl_init, clp); 398 } 399 if (new) { 400 list_add_tail(&new->cl_share_link, 401 &nn->nfs_client_list); 402 spin_unlock(&nn->nfs_client_lock); 403 new->cl_flags = cl_init->init_flags; 404 return rpc_ops->init_client(new, cl_init); 405 } 406 407 spin_unlock(&nn->nfs_client_lock); 408 409 new = rpc_ops->alloc_client(cl_init); 410 } while (!IS_ERR(new)); 411 412 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 413 cl_init->hostname, PTR_ERR(new)); 414 return new; 415 } 416 EXPORT_SYMBOL_GPL(nfs_get_client); 417 418 /* 419 * Mark a server as ready or failed 420 */ 421 void nfs_mark_client_ready(struct nfs_client *clp, int state) 422 { 423 smp_wmb(); 424 clp->cl_cons_state = state; 425 wake_up_all(&nfs_client_active_wq); 426 } 427 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 428 429 /* 430 * Initialise the timeout values for a connection 431 */ 432 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 433 int timeo, int retrans) 434 { 435 to->to_initval = timeo * HZ / 10; 436 to->to_retries = retrans; 437 438 switch (proto) { 439 case XPRT_TRANSPORT_TCP: 440 case XPRT_TRANSPORT_RDMA: 441 if (retrans == NFS_UNSPEC_RETRANS) 442 to->to_retries = NFS_DEF_TCP_RETRANS; 443 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0) 444 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 445 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 446 to->to_initval = NFS_MAX_TCP_TIMEOUT; 447 to->to_increment = to->to_initval; 448 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 449 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 450 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 451 if (to->to_maxval < to->to_initval) 452 to->to_maxval = to->to_initval; 453 to->to_exponential = 0; 454 break; 455 case XPRT_TRANSPORT_UDP: 456 if (retrans == NFS_UNSPEC_RETRANS) 457 to->to_retries = NFS_DEF_UDP_RETRANS; 458 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 459 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 460 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 461 to->to_initval = NFS_MAX_UDP_TIMEOUT; 462 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 463 to->to_exponential = 1; 464 break; 465 default: 466 BUG(); 467 } 468 } 469 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 470 471 /* 472 * Create an RPC client handle 473 */ 474 int nfs_create_rpc_client(struct nfs_client *clp, 475 const struct nfs_client_initdata *cl_init, 476 rpc_authflavor_t flavor) 477 { 478 struct rpc_clnt *clnt = NULL; 479 struct rpc_create_args args = { 480 .net = clp->cl_net, 481 .protocol = clp->cl_proto, 482 .address = (struct sockaddr *)&clp->cl_addr, 483 .addrsize = clp->cl_addrlen, 484 .timeout = cl_init->timeparms, 485 .servername = clp->cl_hostname, 486 .nodename = cl_init->nodename, 487 .program = &nfs_program, 488 .version = clp->rpc_ops->version, 489 .authflavor = flavor, 490 }; 491 492 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 493 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 494 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 495 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 496 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 497 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 498 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 499 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 500 501 if (!IS_ERR(clp->cl_rpcclient)) 502 return 0; 503 504 clnt = rpc_create(&args); 505 if (IS_ERR(clnt)) { 506 dprintk("%s: cannot create RPC client. Error = %ld\n", 507 __func__, PTR_ERR(clnt)); 508 return PTR_ERR(clnt); 509 } 510 511 clp->cl_rpcclient = clnt; 512 return 0; 513 } 514 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 515 516 /* 517 * Version 2 or 3 client destruction 518 */ 519 static void nfs_destroy_server(struct nfs_server *server) 520 { 521 if (server->nlm_host) 522 nlmclnt_done(server->nlm_host); 523 } 524 525 /* 526 * Version 2 or 3 lockd setup 527 */ 528 static int nfs_start_lockd(struct nfs_server *server) 529 { 530 struct nlm_host *host; 531 struct nfs_client *clp = server->nfs_client; 532 struct nlmclnt_initdata nlm_init = { 533 .hostname = clp->cl_hostname, 534 .address = (struct sockaddr *)&clp->cl_addr, 535 .addrlen = clp->cl_addrlen, 536 .nfs_version = clp->rpc_ops->version, 537 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 538 1 : 0, 539 .net = clp->cl_net, 540 }; 541 542 if (nlm_init.nfs_version > 3) 543 return 0; 544 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 545 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 546 return 0; 547 548 switch (clp->cl_proto) { 549 default: 550 nlm_init.protocol = IPPROTO_TCP; 551 break; 552 case XPRT_TRANSPORT_UDP: 553 nlm_init.protocol = IPPROTO_UDP; 554 } 555 556 host = nlmclnt_init(&nlm_init); 557 if (IS_ERR(host)) 558 return PTR_ERR(host); 559 560 server->nlm_host = host; 561 server->destroy = nfs_destroy_server; 562 return 0; 563 } 564 565 /* 566 * Create a general RPC client 567 */ 568 int nfs_init_server_rpcclient(struct nfs_server *server, 569 const struct rpc_timeout *timeo, 570 rpc_authflavor_t pseudoflavour) 571 { 572 struct nfs_client *clp = server->nfs_client; 573 574 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 575 pseudoflavour); 576 if (IS_ERR(server->client)) { 577 dprintk("%s: couldn't create rpc_client!\n", __func__); 578 return PTR_ERR(server->client); 579 } 580 581 memcpy(&server->client->cl_timeout_default, 582 timeo, 583 sizeof(server->client->cl_timeout_default)); 584 server->client->cl_timeout = &server->client->cl_timeout_default; 585 server->client->cl_softrtry = 0; 586 if (server->flags & NFS_MOUNT_SOFT) 587 server->client->cl_softrtry = 1; 588 589 return 0; 590 } 591 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 592 593 /** 594 * nfs_init_client - Initialise an NFS2 or NFS3 client 595 * 596 * @clp: nfs_client to initialise 597 * @cl_init: Initialisation parameters 598 * 599 * Returns pointer to an NFS client, or an ERR_PTR value. 600 */ 601 struct nfs_client *nfs_init_client(struct nfs_client *clp, 602 const struct nfs_client_initdata *cl_init) 603 { 604 int error; 605 606 if (clp->cl_cons_state == NFS_CS_READY) { 607 /* the client is already initialised */ 608 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 609 return clp; 610 } 611 612 /* 613 * Create a client RPC handle for doing FSSTAT with UNIX auth only 614 * - RFC 2623, sec 2.3.2 615 */ 616 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 617 if (error < 0) 618 goto error; 619 nfs_mark_client_ready(clp, NFS_CS_READY); 620 return clp; 621 622 error: 623 nfs_mark_client_ready(clp, error); 624 nfs_put_client(clp); 625 dprintk("<-- nfs_init_client() = xerror %d\n", error); 626 return ERR_PTR(error); 627 } 628 EXPORT_SYMBOL_GPL(nfs_init_client); 629 630 /* 631 * Create a version 2 or 3 client 632 */ 633 static int nfs_init_server(struct nfs_server *server, 634 const struct nfs_parsed_mount_data *data, 635 struct nfs_subversion *nfs_mod) 636 { 637 struct rpc_timeout timeparms; 638 struct nfs_client_initdata cl_init = { 639 .hostname = data->nfs_server.hostname, 640 .addr = (const struct sockaddr *)&data->nfs_server.address, 641 .addrlen = data->nfs_server.addrlen, 642 .nfs_mod = nfs_mod, 643 .proto = data->nfs_server.protocol, 644 .net = data->net, 645 .timeparms = &timeparms, 646 }; 647 struct nfs_client *clp; 648 int error; 649 650 dprintk("--> nfs_init_server()\n"); 651 652 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 653 data->timeo, data->retrans); 654 if (data->flags & NFS_MOUNT_NORESVPORT) 655 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 656 657 /* Allocate or find a client reference we can use */ 658 clp = nfs_get_client(&cl_init, RPC_AUTH_UNIX); 659 if (IS_ERR(clp)) { 660 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 661 return PTR_ERR(clp); 662 } 663 664 server->nfs_client = clp; 665 666 /* Initialise the client representation from the mount data */ 667 server->flags = data->flags; 668 server->options = data->options; 669 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 670 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 671 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 672 673 if (data->rsize) 674 server->rsize = nfs_block_size(data->rsize, NULL); 675 if (data->wsize) 676 server->wsize = nfs_block_size(data->wsize, NULL); 677 678 server->acregmin = data->acregmin * HZ; 679 server->acregmax = data->acregmax * HZ; 680 server->acdirmin = data->acdirmin * HZ; 681 server->acdirmax = data->acdirmax * HZ; 682 683 /* Start lockd here, before we might error out */ 684 error = nfs_start_lockd(server); 685 if (error < 0) 686 goto error; 687 688 server->port = data->nfs_server.port; 689 server->auth_info = data->auth_info; 690 691 error = nfs_init_server_rpcclient(server, &timeparms, 692 data->selected_flavor); 693 if (error < 0) 694 goto error; 695 696 /* Preserve the values of mount_server-related mount options */ 697 if (data->mount_server.addrlen) { 698 memcpy(&server->mountd_address, &data->mount_server.address, 699 data->mount_server.addrlen); 700 server->mountd_addrlen = data->mount_server.addrlen; 701 } 702 server->mountd_version = data->mount_server.version; 703 server->mountd_port = data->mount_server.port; 704 server->mountd_protocol = data->mount_server.protocol; 705 706 server->namelen = data->namlen; 707 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 708 return 0; 709 710 error: 711 server->nfs_client = NULL; 712 nfs_put_client(clp); 713 dprintk("<-- nfs_init_server() = xerror %d\n", error); 714 return error; 715 } 716 717 /* 718 * Load up the server record from information gained in an fsinfo record 719 */ 720 static void nfs_server_set_fsinfo(struct nfs_server *server, 721 struct nfs_fsinfo *fsinfo) 722 { 723 unsigned long max_rpc_payload; 724 725 /* Work out a lot of parameters */ 726 if (server->rsize == 0) 727 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 728 if (server->wsize == 0) 729 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 730 731 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 732 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 733 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 734 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 735 736 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 737 if (server->rsize > max_rpc_payload) 738 server->rsize = max_rpc_payload; 739 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 740 server->rsize = NFS_MAX_FILE_IO_SIZE; 741 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 742 743 server->backing_dev_info.name = "nfs"; 744 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 745 746 if (server->wsize > max_rpc_payload) 747 server->wsize = max_rpc_payload; 748 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 749 server->wsize = NFS_MAX_FILE_IO_SIZE; 750 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 751 752 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 753 754 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 755 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 756 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 757 if (server->dtsize > server->rsize) 758 server->dtsize = server->rsize; 759 760 if (server->flags & NFS_MOUNT_NOAC) { 761 server->acregmin = server->acregmax = 0; 762 server->acdirmin = server->acdirmax = 0; 763 } 764 765 server->maxfilesize = fsinfo->maxfilesize; 766 767 server->time_delta = fsinfo->time_delta; 768 769 server->clone_blksize = fsinfo->clone_blksize; 770 /* We're airborne Set socket buffersize */ 771 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 772 } 773 774 /* 775 * Probe filesystem information, including the FSID on v2/v3 776 */ 777 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 778 { 779 struct nfs_fsinfo fsinfo; 780 struct nfs_client *clp = server->nfs_client; 781 int error; 782 783 dprintk("--> nfs_probe_fsinfo()\n"); 784 785 if (clp->rpc_ops->set_capabilities != NULL) { 786 error = clp->rpc_ops->set_capabilities(server, mntfh); 787 if (error < 0) 788 goto out_error; 789 } 790 791 fsinfo.fattr = fattr; 792 fsinfo.nlayouttypes = 0; 793 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 794 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 795 if (error < 0) 796 goto out_error; 797 798 nfs_server_set_fsinfo(server, &fsinfo); 799 800 /* Get some general file system info */ 801 if (server->namelen == 0) { 802 struct nfs_pathconf pathinfo; 803 804 pathinfo.fattr = fattr; 805 nfs_fattr_init(fattr); 806 807 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 808 server->namelen = pathinfo.max_namelen; 809 } 810 811 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 812 return 0; 813 814 out_error: 815 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 816 return error; 817 } 818 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 819 820 /* 821 * Copy useful information when duplicating a server record 822 */ 823 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 824 { 825 target->flags = source->flags; 826 target->rsize = source->rsize; 827 target->wsize = source->wsize; 828 target->acregmin = source->acregmin; 829 target->acregmax = source->acregmax; 830 target->acdirmin = source->acdirmin; 831 target->acdirmax = source->acdirmax; 832 target->caps = source->caps; 833 target->options = source->options; 834 target->auth_info = source->auth_info; 835 } 836 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 837 838 void nfs_server_insert_lists(struct nfs_server *server) 839 { 840 struct nfs_client *clp = server->nfs_client; 841 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 842 843 spin_lock(&nn->nfs_client_lock); 844 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 845 list_add_tail(&server->master_link, &nn->nfs_volume_list); 846 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 847 spin_unlock(&nn->nfs_client_lock); 848 849 } 850 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 851 852 void nfs_server_remove_lists(struct nfs_server *server) 853 { 854 struct nfs_client *clp = server->nfs_client; 855 struct nfs_net *nn; 856 857 if (clp == NULL) 858 return; 859 nn = net_generic(clp->cl_net, nfs_net_id); 860 spin_lock(&nn->nfs_client_lock); 861 list_del_rcu(&server->client_link); 862 if (list_empty(&clp->cl_superblocks)) 863 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 864 list_del(&server->master_link); 865 spin_unlock(&nn->nfs_client_lock); 866 867 synchronize_rcu(); 868 } 869 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 870 871 /* 872 * Allocate and initialise a server record 873 */ 874 struct nfs_server *nfs_alloc_server(void) 875 { 876 struct nfs_server *server; 877 878 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 879 if (!server) 880 return NULL; 881 882 server->client = server->client_acl = ERR_PTR(-EINVAL); 883 884 /* Zero out the NFS state stuff */ 885 INIT_LIST_HEAD(&server->client_link); 886 INIT_LIST_HEAD(&server->master_link); 887 INIT_LIST_HEAD(&server->delegations); 888 INIT_LIST_HEAD(&server->layouts); 889 INIT_LIST_HEAD(&server->state_owners_lru); 890 891 atomic_set(&server->active, 0); 892 893 server->io_stats = nfs_alloc_iostats(); 894 if (!server->io_stats) { 895 kfree(server); 896 return NULL; 897 } 898 899 if (bdi_init(&server->backing_dev_info)) { 900 nfs_free_iostats(server->io_stats); 901 kfree(server); 902 return NULL; 903 } 904 905 ida_init(&server->openowner_id); 906 ida_init(&server->lockowner_id); 907 pnfs_init_server(server); 908 909 return server; 910 } 911 EXPORT_SYMBOL_GPL(nfs_alloc_server); 912 913 /* 914 * Free up a server record 915 */ 916 void nfs_free_server(struct nfs_server *server) 917 { 918 dprintk("--> nfs_free_server()\n"); 919 920 nfs_server_remove_lists(server); 921 922 if (server->destroy != NULL) 923 server->destroy(server); 924 925 if (!IS_ERR(server->client_acl)) 926 rpc_shutdown_client(server->client_acl); 927 if (!IS_ERR(server->client)) 928 rpc_shutdown_client(server->client); 929 930 nfs_put_client(server->nfs_client); 931 932 ida_destroy(&server->lockowner_id); 933 ida_destroy(&server->openowner_id); 934 nfs_free_iostats(server->io_stats); 935 bdi_destroy(&server->backing_dev_info); 936 kfree(server); 937 nfs_release_automount_timer(); 938 dprintk("<-- nfs_free_server()\n"); 939 } 940 EXPORT_SYMBOL_GPL(nfs_free_server); 941 942 /* 943 * Create a version 2 or 3 volume record 944 * - keyed on server and FSID 945 */ 946 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 947 struct nfs_subversion *nfs_mod) 948 { 949 struct nfs_server *server; 950 struct nfs_fattr *fattr; 951 int error; 952 953 server = nfs_alloc_server(); 954 if (!server) 955 return ERR_PTR(-ENOMEM); 956 957 error = -ENOMEM; 958 fattr = nfs_alloc_fattr(); 959 if (fattr == NULL) 960 goto error; 961 962 /* Get a client representation */ 963 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 964 if (error < 0) 965 goto error; 966 967 /* Probe the root fh to retrieve its FSID */ 968 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 969 if (error < 0) 970 goto error; 971 if (server->nfs_client->rpc_ops->version == 3) { 972 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 973 server->namelen = NFS3_MAXNAMLEN; 974 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 975 server->caps |= NFS_CAP_READDIRPLUS; 976 } else { 977 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 978 server->namelen = NFS2_MAXNAMLEN; 979 } 980 981 if (!(fattr->valid & NFS_ATTR_FATTR)) { 982 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 983 if (error < 0) { 984 dprintk("nfs_create_server: getattr error = %d\n", -error); 985 goto error; 986 } 987 } 988 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 989 990 dprintk("Server FSID: %llx:%llx\n", 991 (unsigned long long) server->fsid.major, 992 (unsigned long long) server->fsid.minor); 993 994 nfs_server_insert_lists(server); 995 server->mount_time = jiffies; 996 nfs_free_fattr(fattr); 997 return server; 998 999 error: 1000 nfs_free_fattr(fattr); 1001 nfs_free_server(server); 1002 return ERR_PTR(error); 1003 } 1004 EXPORT_SYMBOL_GPL(nfs_create_server); 1005 1006 /* 1007 * Clone an NFS2, NFS3 or NFS4 server record 1008 */ 1009 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1010 struct nfs_fh *fh, 1011 struct nfs_fattr *fattr, 1012 rpc_authflavor_t flavor) 1013 { 1014 struct nfs_server *server; 1015 struct nfs_fattr *fattr_fsinfo; 1016 int error; 1017 1018 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1019 (unsigned long long) fattr->fsid.major, 1020 (unsigned long long) fattr->fsid.minor); 1021 1022 server = nfs_alloc_server(); 1023 if (!server) 1024 return ERR_PTR(-ENOMEM); 1025 1026 error = -ENOMEM; 1027 fattr_fsinfo = nfs_alloc_fattr(); 1028 if (fattr_fsinfo == NULL) 1029 goto out_free_server; 1030 1031 /* Copy data from the source */ 1032 server->nfs_client = source->nfs_client; 1033 server->destroy = source->destroy; 1034 atomic_inc(&server->nfs_client->cl_count); 1035 nfs_server_copy_userdata(server, source); 1036 1037 server->fsid = fattr->fsid; 1038 1039 error = nfs_init_server_rpcclient(server, 1040 source->client->cl_timeout, 1041 flavor); 1042 if (error < 0) 1043 goto out_free_server; 1044 1045 /* probe the filesystem info for this server filesystem */ 1046 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1047 if (error < 0) 1048 goto out_free_server; 1049 1050 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1051 server->namelen = NFS4_MAXNAMLEN; 1052 1053 dprintk("Cloned FSID: %llx:%llx\n", 1054 (unsigned long long) server->fsid.major, 1055 (unsigned long long) server->fsid.minor); 1056 1057 error = nfs_start_lockd(server); 1058 if (error < 0) 1059 goto out_free_server; 1060 1061 nfs_server_insert_lists(server); 1062 server->mount_time = jiffies; 1063 1064 nfs_free_fattr(fattr_fsinfo); 1065 dprintk("<-- nfs_clone_server() = %p\n", server); 1066 return server; 1067 1068 out_free_server: 1069 nfs_free_fattr(fattr_fsinfo); 1070 nfs_free_server(server); 1071 dprintk("<-- nfs_clone_server() = error %d\n", error); 1072 return ERR_PTR(error); 1073 } 1074 EXPORT_SYMBOL_GPL(nfs_clone_server); 1075 1076 void nfs_clients_init(struct net *net) 1077 { 1078 struct nfs_net *nn = net_generic(net, nfs_net_id); 1079 1080 INIT_LIST_HEAD(&nn->nfs_client_list); 1081 INIT_LIST_HEAD(&nn->nfs_volume_list); 1082 #if IS_ENABLED(CONFIG_NFS_V4) 1083 idr_init(&nn->cb_ident_idr); 1084 #endif 1085 spin_lock_init(&nn->nfs_client_lock); 1086 nn->boot_time = ktime_get_real(); 1087 } 1088 1089 #ifdef CONFIG_PROC_FS 1090 static int nfs_server_list_open(struct inode *inode, struct file *file); 1091 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1092 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1093 static void nfs_server_list_stop(struct seq_file *p, void *v); 1094 static int nfs_server_list_show(struct seq_file *m, void *v); 1095 1096 static const struct seq_operations nfs_server_list_ops = { 1097 .start = nfs_server_list_start, 1098 .next = nfs_server_list_next, 1099 .stop = nfs_server_list_stop, 1100 .show = nfs_server_list_show, 1101 }; 1102 1103 static const struct file_operations nfs_server_list_fops = { 1104 .open = nfs_server_list_open, 1105 .read = seq_read, 1106 .llseek = seq_lseek, 1107 .release = seq_release_net, 1108 }; 1109 1110 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1111 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1112 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1113 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1114 static int nfs_volume_list_show(struct seq_file *m, void *v); 1115 1116 static const struct seq_operations nfs_volume_list_ops = { 1117 .start = nfs_volume_list_start, 1118 .next = nfs_volume_list_next, 1119 .stop = nfs_volume_list_stop, 1120 .show = nfs_volume_list_show, 1121 }; 1122 1123 static const struct file_operations nfs_volume_list_fops = { 1124 .open = nfs_volume_list_open, 1125 .read = seq_read, 1126 .llseek = seq_lseek, 1127 .release = seq_release_net, 1128 }; 1129 1130 /* 1131 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1132 * we're dealing 1133 */ 1134 static int nfs_server_list_open(struct inode *inode, struct file *file) 1135 { 1136 return seq_open_net(inode, file, &nfs_server_list_ops, 1137 sizeof(struct seq_net_private)); 1138 } 1139 1140 /* 1141 * set up the iterator to start reading from the server list and return the first item 1142 */ 1143 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1144 __acquires(&nn->nfs_client_lock) 1145 { 1146 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1147 1148 /* lock the list against modification */ 1149 spin_lock(&nn->nfs_client_lock); 1150 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1151 } 1152 1153 /* 1154 * move to next server 1155 */ 1156 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1157 { 1158 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1159 1160 return seq_list_next(v, &nn->nfs_client_list, pos); 1161 } 1162 1163 /* 1164 * clean up after reading from the transports list 1165 */ 1166 static void nfs_server_list_stop(struct seq_file *p, void *v) 1167 __releases(&nn->nfs_client_lock) 1168 { 1169 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1170 1171 spin_unlock(&nn->nfs_client_lock); 1172 } 1173 1174 /* 1175 * display a header line followed by a load of call lines 1176 */ 1177 static int nfs_server_list_show(struct seq_file *m, void *v) 1178 { 1179 struct nfs_client *clp; 1180 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1181 1182 /* display header on line 1 */ 1183 if (v == &nn->nfs_client_list) { 1184 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1185 return 0; 1186 } 1187 1188 /* display one transport per line on subsequent lines */ 1189 clp = list_entry(v, struct nfs_client, cl_share_link); 1190 1191 /* Check if the client is initialized */ 1192 if (clp->cl_cons_state != NFS_CS_READY) 1193 return 0; 1194 1195 rcu_read_lock(); 1196 seq_printf(m, "v%u %s %s %3d %s\n", 1197 clp->rpc_ops->version, 1198 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1199 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1200 atomic_read(&clp->cl_count), 1201 clp->cl_hostname); 1202 rcu_read_unlock(); 1203 1204 return 0; 1205 } 1206 1207 /* 1208 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1209 */ 1210 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1211 { 1212 return seq_open_net(inode, file, &nfs_volume_list_ops, 1213 sizeof(struct seq_net_private)); 1214 } 1215 1216 /* 1217 * set up the iterator to start reading from the volume list and return the first item 1218 */ 1219 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1220 __acquires(&nn->nfs_client_lock) 1221 { 1222 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1223 1224 /* lock the list against modification */ 1225 spin_lock(&nn->nfs_client_lock); 1226 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1227 } 1228 1229 /* 1230 * move to next volume 1231 */ 1232 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1233 { 1234 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1235 1236 return seq_list_next(v, &nn->nfs_volume_list, pos); 1237 } 1238 1239 /* 1240 * clean up after reading from the transports list 1241 */ 1242 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1243 __releases(&nn->nfs_client_lock) 1244 { 1245 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1246 1247 spin_unlock(&nn->nfs_client_lock); 1248 } 1249 1250 /* 1251 * display a header line followed by a load of call lines 1252 */ 1253 static int nfs_volume_list_show(struct seq_file *m, void *v) 1254 { 1255 struct nfs_server *server; 1256 struct nfs_client *clp; 1257 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1258 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1259 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1260 1261 /* display header on line 1 */ 1262 if (v == &nn->nfs_volume_list) { 1263 seq_puts(m, "NV SERVER PORT DEV FSID" 1264 " FSC\n"); 1265 return 0; 1266 } 1267 /* display one transport per line on subsequent lines */ 1268 server = list_entry(v, struct nfs_server, master_link); 1269 clp = server->nfs_client; 1270 1271 snprintf(dev, sizeof(dev), "%u:%u", 1272 MAJOR(server->s_dev), MINOR(server->s_dev)); 1273 1274 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1275 (unsigned long long) server->fsid.major, 1276 (unsigned long long) server->fsid.minor); 1277 1278 rcu_read_lock(); 1279 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1280 clp->rpc_ops->version, 1281 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1283 dev, 1284 fsid, 1285 nfs_server_fscache_state(server)); 1286 rcu_read_unlock(); 1287 1288 return 0; 1289 } 1290 1291 int nfs_fs_proc_net_init(struct net *net) 1292 { 1293 struct nfs_net *nn = net_generic(net, nfs_net_id); 1294 struct proc_dir_entry *p; 1295 1296 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1297 if (!nn->proc_nfsfs) 1298 goto error_0; 1299 1300 /* a file of servers with which we're dealing */ 1301 p = proc_create("servers", S_IFREG|S_IRUGO, 1302 nn->proc_nfsfs, &nfs_server_list_fops); 1303 if (!p) 1304 goto error_1; 1305 1306 /* a file of volumes that we have mounted */ 1307 p = proc_create("volumes", S_IFREG|S_IRUGO, 1308 nn->proc_nfsfs, &nfs_volume_list_fops); 1309 if (!p) 1310 goto error_1; 1311 return 0; 1312 1313 error_1: 1314 remove_proc_subtree("nfsfs", net->proc_net); 1315 error_0: 1316 return -ENOMEM; 1317 } 1318 1319 void nfs_fs_proc_net_exit(struct net *net) 1320 { 1321 remove_proc_subtree("nfsfs", net->proc_net); 1322 } 1323 1324 /* 1325 * initialise the /proc/fs/nfsfs/ directory 1326 */ 1327 int __init nfs_fs_proc_init(void) 1328 { 1329 if (!proc_mkdir("fs/nfsfs", NULL)) 1330 goto error_0; 1331 1332 /* a file of servers with which we're dealing */ 1333 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1334 goto error_1; 1335 1336 /* a file of volumes that we have mounted */ 1337 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1338 goto error_1; 1339 1340 return 0; 1341 error_1: 1342 remove_proc_subtree("fs/nfsfs", NULL); 1343 error_0: 1344 return -ENOMEM; 1345 } 1346 1347 /* 1348 * clean up the /proc/fs/nfsfs/ directory 1349 */ 1350 void nfs_fs_proc_exit(void) 1351 { 1352 remove_proc_subtree("fs/nfsfs", NULL); 1353 } 1354 1355 #endif /* CONFIG_PROC_FS */ 1356