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 continue; 317 318 atomic_inc(&clp->cl_count); 319 return clp; 320 } 321 return NULL; 322 } 323 324 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 325 { 326 return clp->cl_cons_state <= NFS_CS_READY; 327 } 328 329 int nfs_wait_client_init_complete(const struct nfs_client *clp) 330 { 331 return wait_event_killable(nfs_client_active_wq, 332 nfs_client_init_is_complete(clp)); 333 } 334 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 335 336 /* 337 * Found an existing client. Make sure it's ready before returning. 338 */ 339 static struct nfs_client * 340 nfs_found_client(const struct nfs_client_initdata *cl_init, 341 struct nfs_client *clp) 342 { 343 int error; 344 345 error = nfs_wait_client_init_complete(clp); 346 if (error < 0) { 347 nfs_put_client(clp); 348 return ERR_PTR(-ERESTARTSYS); 349 } 350 351 if (clp->cl_cons_state < NFS_CS_READY) { 352 error = clp->cl_cons_state; 353 nfs_put_client(clp); 354 return ERR_PTR(error); 355 } 356 357 smp_rmb(); 358 359 dprintk("<-- %s found nfs_client %p for %s\n", 360 __func__, clp, cl_init->hostname ?: ""); 361 return clp; 362 } 363 364 /* 365 * Look up a client by IP address and protocol version 366 * - creates a new record if one doesn't yet exist 367 */ 368 struct nfs_client * 369 nfs_get_client(const struct nfs_client_initdata *cl_init, 370 rpc_authflavor_t authflavour) 371 { 372 struct nfs_client *clp, *new = NULL; 373 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 374 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 375 376 if (cl_init->hostname == NULL) { 377 WARN_ON(1); 378 return NULL; 379 } 380 381 dprintk("--> nfs_get_client(%s,v%u)\n", 382 cl_init->hostname, rpc_ops->version); 383 384 /* see if the client already exists */ 385 do { 386 spin_lock(&nn->nfs_client_lock); 387 388 clp = nfs_match_client(cl_init); 389 if (clp) { 390 spin_unlock(&nn->nfs_client_lock); 391 if (new) 392 new->rpc_ops->free_client(new); 393 return nfs_found_client(cl_init, clp); 394 } 395 if (new) { 396 list_add_tail(&new->cl_share_link, 397 &nn->nfs_client_list); 398 spin_unlock(&nn->nfs_client_lock); 399 new->cl_flags = cl_init->init_flags; 400 return rpc_ops->init_client(new, cl_init); 401 } 402 403 spin_unlock(&nn->nfs_client_lock); 404 405 new = rpc_ops->alloc_client(cl_init); 406 } while (!IS_ERR(new)); 407 408 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 409 cl_init->hostname, PTR_ERR(new)); 410 return new; 411 } 412 EXPORT_SYMBOL_GPL(nfs_get_client); 413 414 /* 415 * Mark a server as ready or failed 416 */ 417 void nfs_mark_client_ready(struct nfs_client *clp, int state) 418 { 419 smp_wmb(); 420 clp->cl_cons_state = state; 421 wake_up_all(&nfs_client_active_wq); 422 } 423 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 424 425 /* 426 * Initialise the timeout values for a connection 427 */ 428 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 429 int timeo, int retrans) 430 { 431 to->to_initval = timeo * HZ / 10; 432 to->to_retries = retrans; 433 434 switch (proto) { 435 case XPRT_TRANSPORT_TCP: 436 case XPRT_TRANSPORT_RDMA: 437 if (retrans == NFS_UNSPEC_RETRANS) 438 to->to_retries = NFS_DEF_TCP_RETRANS; 439 if (timeo == NFS_UNSPEC_TIMEO || to->to_retries == 0) 440 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 441 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 442 to->to_initval = NFS_MAX_TCP_TIMEOUT; 443 to->to_increment = to->to_initval; 444 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 445 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 446 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 447 if (to->to_maxval < to->to_initval) 448 to->to_maxval = to->to_initval; 449 to->to_exponential = 0; 450 break; 451 case XPRT_TRANSPORT_UDP: 452 if (retrans == NFS_UNSPEC_RETRANS) 453 to->to_retries = NFS_DEF_UDP_RETRANS; 454 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 455 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 456 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 457 to->to_initval = NFS_MAX_UDP_TIMEOUT; 458 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 459 to->to_exponential = 1; 460 break; 461 default: 462 BUG(); 463 } 464 } 465 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 466 467 /* 468 * Create an RPC client handle 469 */ 470 int nfs_create_rpc_client(struct nfs_client *clp, 471 const struct nfs_client_initdata *cl_init, 472 rpc_authflavor_t flavor) 473 { 474 struct rpc_clnt *clnt = NULL; 475 struct rpc_create_args args = { 476 .net = clp->cl_net, 477 .protocol = clp->cl_proto, 478 .address = (struct sockaddr *)&clp->cl_addr, 479 .addrsize = clp->cl_addrlen, 480 .timeout = cl_init->timeparms, 481 .servername = clp->cl_hostname, 482 .nodename = cl_init->nodename, 483 .program = &nfs_program, 484 .version = clp->rpc_ops->version, 485 .authflavor = flavor, 486 }; 487 488 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 489 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 490 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 491 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 492 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 493 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 494 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 495 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 496 497 if (!IS_ERR(clp->cl_rpcclient)) 498 return 0; 499 500 clnt = rpc_create(&args); 501 if (IS_ERR(clnt)) { 502 dprintk("%s: cannot create RPC client. Error = %ld\n", 503 __func__, PTR_ERR(clnt)); 504 return PTR_ERR(clnt); 505 } 506 507 clp->cl_rpcclient = clnt; 508 return 0; 509 } 510 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 511 512 /* 513 * Version 2 or 3 client destruction 514 */ 515 static void nfs_destroy_server(struct nfs_server *server) 516 { 517 if (server->nlm_host) 518 nlmclnt_done(server->nlm_host); 519 } 520 521 /* 522 * Version 2 or 3 lockd setup 523 */ 524 static int nfs_start_lockd(struct nfs_server *server) 525 { 526 struct nlm_host *host; 527 struct nfs_client *clp = server->nfs_client; 528 struct nlmclnt_initdata nlm_init = { 529 .hostname = clp->cl_hostname, 530 .address = (struct sockaddr *)&clp->cl_addr, 531 .addrlen = clp->cl_addrlen, 532 .nfs_version = clp->rpc_ops->version, 533 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 534 1 : 0, 535 .net = clp->cl_net, 536 }; 537 538 if (nlm_init.nfs_version > 3) 539 return 0; 540 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 541 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 542 return 0; 543 544 switch (clp->cl_proto) { 545 default: 546 nlm_init.protocol = IPPROTO_TCP; 547 break; 548 case XPRT_TRANSPORT_UDP: 549 nlm_init.protocol = IPPROTO_UDP; 550 } 551 552 host = nlmclnt_init(&nlm_init); 553 if (IS_ERR(host)) 554 return PTR_ERR(host); 555 556 server->nlm_host = host; 557 server->destroy = nfs_destroy_server; 558 return 0; 559 } 560 561 /* 562 * Create a general RPC client 563 */ 564 int nfs_init_server_rpcclient(struct nfs_server *server, 565 const struct rpc_timeout *timeo, 566 rpc_authflavor_t pseudoflavour) 567 { 568 struct nfs_client *clp = server->nfs_client; 569 570 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 571 pseudoflavour); 572 if (IS_ERR(server->client)) { 573 dprintk("%s: couldn't create rpc_client!\n", __func__); 574 return PTR_ERR(server->client); 575 } 576 577 memcpy(&server->client->cl_timeout_default, 578 timeo, 579 sizeof(server->client->cl_timeout_default)); 580 server->client->cl_timeout = &server->client->cl_timeout_default; 581 server->client->cl_softrtry = 0; 582 if (server->flags & NFS_MOUNT_SOFT) 583 server->client->cl_softrtry = 1; 584 585 return 0; 586 } 587 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 588 589 /** 590 * nfs_init_client - Initialise an NFS2 or NFS3 client 591 * 592 * @clp: nfs_client to initialise 593 * @cl_init: Initialisation parameters 594 * 595 * Returns pointer to an NFS client, or an ERR_PTR value. 596 */ 597 struct nfs_client *nfs_init_client(struct nfs_client *clp, 598 const struct nfs_client_initdata *cl_init) 599 { 600 int error; 601 602 if (clp->cl_cons_state == NFS_CS_READY) { 603 /* the client is already initialised */ 604 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 605 return clp; 606 } 607 608 /* 609 * Create a client RPC handle for doing FSSTAT with UNIX auth only 610 * - RFC 2623, sec 2.3.2 611 */ 612 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 613 if (error < 0) 614 goto error; 615 nfs_mark_client_ready(clp, NFS_CS_READY); 616 return clp; 617 618 error: 619 nfs_mark_client_ready(clp, error); 620 nfs_put_client(clp); 621 dprintk("<-- nfs_init_client() = xerror %d\n", error); 622 return ERR_PTR(error); 623 } 624 EXPORT_SYMBOL_GPL(nfs_init_client); 625 626 /* 627 * Create a version 2 or 3 client 628 */ 629 static int nfs_init_server(struct nfs_server *server, 630 const struct nfs_parsed_mount_data *data, 631 struct nfs_subversion *nfs_mod) 632 { 633 struct rpc_timeout timeparms; 634 struct nfs_client_initdata cl_init = { 635 .hostname = data->nfs_server.hostname, 636 .addr = (const struct sockaddr *)&data->nfs_server.address, 637 .addrlen = data->nfs_server.addrlen, 638 .nfs_mod = nfs_mod, 639 .proto = data->nfs_server.protocol, 640 .net = data->net, 641 .timeparms = &timeparms, 642 }; 643 struct nfs_client *clp; 644 int error; 645 646 dprintk("--> nfs_init_server()\n"); 647 648 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 649 data->timeo, data->retrans); 650 if (data->flags & NFS_MOUNT_NORESVPORT) 651 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 652 653 /* Allocate or find a client reference we can use */ 654 clp = nfs_get_client(&cl_init, RPC_AUTH_UNIX); 655 if (IS_ERR(clp)) { 656 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 657 return PTR_ERR(clp); 658 } 659 660 server->nfs_client = clp; 661 662 /* Initialise the client representation from the mount data */ 663 server->flags = data->flags; 664 server->options = data->options; 665 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 666 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 667 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 668 669 if (data->rsize) 670 server->rsize = nfs_block_size(data->rsize, NULL); 671 if (data->wsize) 672 server->wsize = nfs_block_size(data->wsize, NULL); 673 674 server->acregmin = data->acregmin * HZ; 675 server->acregmax = data->acregmax * HZ; 676 server->acdirmin = data->acdirmin * HZ; 677 server->acdirmax = data->acdirmax * HZ; 678 679 /* Start lockd here, before we might error out */ 680 error = nfs_start_lockd(server); 681 if (error < 0) 682 goto error; 683 684 server->port = data->nfs_server.port; 685 server->auth_info = data->auth_info; 686 687 error = nfs_init_server_rpcclient(server, &timeparms, 688 data->selected_flavor); 689 if (error < 0) 690 goto error; 691 692 /* Preserve the values of mount_server-related mount options */ 693 if (data->mount_server.addrlen) { 694 memcpy(&server->mountd_address, &data->mount_server.address, 695 data->mount_server.addrlen); 696 server->mountd_addrlen = data->mount_server.addrlen; 697 } 698 server->mountd_version = data->mount_server.version; 699 server->mountd_port = data->mount_server.port; 700 server->mountd_protocol = data->mount_server.protocol; 701 702 server->namelen = data->namlen; 703 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 704 return 0; 705 706 error: 707 server->nfs_client = NULL; 708 nfs_put_client(clp); 709 dprintk("<-- nfs_init_server() = xerror %d\n", error); 710 return error; 711 } 712 713 /* 714 * Load up the server record from information gained in an fsinfo record 715 */ 716 static void nfs_server_set_fsinfo(struct nfs_server *server, 717 struct nfs_fsinfo *fsinfo) 718 { 719 unsigned long max_rpc_payload; 720 721 /* Work out a lot of parameters */ 722 if (server->rsize == 0) 723 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 724 if (server->wsize == 0) 725 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 726 727 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 728 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 729 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 730 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 731 732 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 733 if (server->rsize > max_rpc_payload) 734 server->rsize = max_rpc_payload; 735 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 736 server->rsize = NFS_MAX_FILE_IO_SIZE; 737 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 738 739 server->backing_dev_info.name = "nfs"; 740 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 741 742 if (server->wsize > max_rpc_payload) 743 server->wsize = max_rpc_payload; 744 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 745 server->wsize = NFS_MAX_FILE_IO_SIZE; 746 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 747 748 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 749 750 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 751 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 752 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 753 if (server->dtsize > server->rsize) 754 server->dtsize = server->rsize; 755 756 if (server->flags & NFS_MOUNT_NOAC) { 757 server->acregmin = server->acregmax = 0; 758 server->acdirmin = server->acdirmax = 0; 759 } 760 761 server->maxfilesize = fsinfo->maxfilesize; 762 763 server->time_delta = fsinfo->time_delta; 764 765 server->clone_blksize = fsinfo->clone_blksize; 766 /* We're airborne Set socket buffersize */ 767 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 768 } 769 770 /* 771 * Probe filesystem information, including the FSID on v2/v3 772 */ 773 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 774 { 775 struct nfs_fsinfo fsinfo; 776 struct nfs_client *clp = server->nfs_client; 777 int error; 778 779 dprintk("--> nfs_probe_fsinfo()\n"); 780 781 if (clp->rpc_ops->set_capabilities != NULL) { 782 error = clp->rpc_ops->set_capabilities(server, mntfh); 783 if (error < 0) 784 goto out_error; 785 } 786 787 fsinfo.fattr = fattr; 788 fsinfo.layouttype = 0; 789 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 790 if (error < 0) 791 goto out_error; 792 793 nfs_server_set_fsinfo(server, &fsinfo); 794 795 /* Get some general file system info */ 796 if (server->namelen == 0) { 797 struct nfs_pathconf pathinfo; 798 799 pathinfo.fattr = fattr; 800 nfs_fattr_init(fattr); 801 802 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 803 server->namelen = pathinfo.max_namelen; 804 } 805 806 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 807 return 0; 808 809 out_error: 810 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 811 return error; 812 } 813 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 814 815 /* 816 * Copy useful information when duplicating a server record 817 */ 818 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 819 { 820 target->flags = source->flags; 821 target->rsize = source->rsize; 822 target->wsize = source->wsize; 823 target->acregmin = source->acregmin; 824 target->acregmax = source->acregmax; 825 target->acdirmin = source->acdirmin; 826 target->acdirmax = source->acdirmax; 827 target->caps = source->caps; 828 target->options = source->options; 829 target->auth_info = source->auth_info; 830 } 831 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 832 833 void nfs_server_insert_lists(struct nfs_server *server) 834 { 835 struct nfs_client *clp = server->nfs_client; 836 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 837 838 spin_lock(&nn->nfs_client_lock); 839 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 840 list_add_tail(&server->master_link, &nn->nfs_volume_list); 841 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 842 spin_unlock(&nn->nfs_client_lock); 843 844 } 845 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 846 847 void nfs_server_remove_lists(struct nfs_server *server) 848 { 849 struct nfs_client *clp = server->nfs_client; 850 struct nfs_net *nn; 851 852 if (clp == NULL) 853 return; 854 nn = net_generic(clp->cl_net, nfs_net_id); 855 spin_lock(&nn->nfs_client_lock); 856 list_del_rcu(&server->client_link); 857 if (list_empty(&clp->cl_superblocks)) 858 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 859 list_del(&server->master_link); 860 spin_unlock(&nn->nfs_client_lock); 861 862 synchronize_rcu(); 863 } 864 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 865 866 /* 867 * Allocate and initialise a server record 868 */ 869 struct nfs_server *nfs_alloc_server(void) 870 { 871 struct nfs_server *server; 872 873 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 874 if (!server) 875 return NULL; 876 877 server->client = server->client_acl = ERR_PTR(-EINVAL); 878 879 /* Zero out the NFS state stuff */ 880 INIT_LIST_HEAD(&server->client_link); 881 INIT_LIST_HEAD(&server->master_link); 882 INIT_LIST_HEAD(&server->delegations); 883 INIT_LIST_HEAD(&server->layouts); 884 INIT_LIST_HEAD(&server->state_owners_lru); 885 886 atomic_set(&server->active, 0); 887 888 server->io_stats = nfs_alloc_iostats(); 889 if (!server->io_stats) { 890 kfree(server); 891 return NULL; 892 } 893 894 if (bdi_init(&server->backing_dev_info)) { 895 nfs_free_iostats(server->io_stats); 896 kfree(server); 897 return NULL; 898 } 899 900 ida_init(&server->openowner_id); 901 ida_init(&server->lockowner_id); 902 pnfs_init_server(server); 903 904 return server; 905 } 906 EXPORT_SYMBOL_GPL(nfs_alloc_server); 907 908 /* 909 * Free up a server record 910 */ 911 void nfs_free_server(struct nfs_server *server) 912 { 913 dprintk("--> nfs_free_server()\n"); 914 915 nfs_server_remove_lists(server); 916 917 if (server->destroy != NULL) 918 server->destroy(server); 919 920 if (!IS_ERR(server->client_acl)) 921 rpc_shutdown_client(server->client_acl); 922 if (!IS_ERR(server->client)) 923 rpc_shutdown_client(server->client); 924 925 nfs_put_client(server->nfs_client); 926 927 ida_destroy(&server->lockowner_id); 928 ida_destroy(&server->openowner_id); 929 nfs_free_iostats(server->io_stats); 930 bdi_destroy(&server->backing_dev_info); 931 kfree(server); 932 nfs_release_automount_timer(); 933 dprintk("<-- nfs_free_server()\n"); 934 } 935 EXPORT_SYMBOL_GPL(nfs_free_server); 936 937 /* 938 * Create a version 2 or 3 volume record 939 * - keyed on server and FSID 940 */ 941 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 942 struct nfs_subversion *nfs_mod) 943 { 944 struct nfs_server *server; 945 struct nfs_fattr *fattr; 946 int error; 947 948 server = nfs_alloc_server(); 949 if (!server) 950 return ERR_PTR(-ENOMEM); 951 952 error = -ENOMEM; 953 fattr = nfs_alloc_fattr(); 954 if (fattr == NULL) 955 goto error; 956 957 /* Get a client representation */ 958 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 959 if (error < 0) 960 goto error; 961 962 /* Probe the root fh to retrieve its FSID */ 963 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 964 if (error < 0) 965 goto error; 966 if (server->nfs_client->rpc_ops->version == 3) { 967 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 968 server->namelen = NFS3_MAXNAMLEN; 969 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 970 server->caps |= NFS_CAP_READDIRPLUS; 971 } else { 972 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 973 server->namelen = NFS2_MAXNAMLEN; 974 } 975 976 if (!(fattr->valid & NFS_ATTR_FATTR)) { 977 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 978 if (error < 0) { 979 dprintk("nfs_create_server: getattr error = %d\n", -error); 980 goto error; 981 } 982 } 983 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 984 985 dprintk("Server FSID: %llx:%llx\n", 986 (unsigned long long) server->fsid.major, 987 (unsigned long long) server->fsid.minor); 988 989 nfs_server_insert_lists(server); 990 server->mount_time = jiffies; 991 nfs_free_fattr(fattr); 992 return server; 993 994 error: 995 nfs_free_fattr(fattr); 996 nfs_free_server(server); 997 return ERR_PTR(error); 998 } 999 EXPORT_SYMBOL_GPL(nfs_create_server); 1000 1001 /* 1002 * Clone an NFS2, NFS3 or NFS4 server record 1003 */ 1004 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1005 struct nfs_fh *fh, 1006 struct nfs_fattr *fattr, 1007 rpc_authflavor_t flavor) 1008 { 1009 struct nfs_server *server; 1010 struct nfs_fattr *fattr_fsinfo; 1011 int error; 1012 1013 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1014 (unsigned long long) fattr->fsid.major, 1015 (unsigned long long) fattr->fsid.minor); 1016 1017 server = nfs_alloc_server(); 1018 if (!server) 1019 return ERR_PTR(-ENOMEM); 1020 1021 error = -ENOMEM; 1022 fattr_fsinfo = nfs_alloc_fattr(); 1023 if (fattr_fsinfo == NULL) 1024 goto out_free_server; 1025 1026 /* Copy data from the source */ 1027 server->nfs_client = source->nfs_client; 1028 server->destroy = source->destroy; 1029 atomic_inc(&server->nfs_client->cl_count); 1030 nfs_server_copy_userdata(server, source); 1031 1032 server->fsid = fattr->fsid; 1033 1034 error = nfs_init_server_rpcclient(server, 1035 source->client->cl_timeout, 1036 flavor); 1037 if (error < 0) 1038 goto out_free_server; 1039 1040 /* probe the filesystem info for this server filesystem */ 1041 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1042 if (error < 0) 1043 goto out_free_server; 1044 1045 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1046 server->namelen = NFS4_MAXNAMLEN; 1047 1048 dprintk("Cloned FSID: %llx:%llx\n", 1049 (unsigned long long) server->fsid.major, 1050 (unsigned long long) server->fsid.minor); 1051 1052 error = nfs_start_lockd(server); 1053 if (error < 0) 1054 goto out_free_server; 1055 1056 nfs_server_insert_lists(server); 1057 server->mount_time = jiffies; 1058 1059 nfs_free_fattr(fattr_fsinfo); 1060 dprintk("<-- nfs_clone_server() = %p\n", server); 1061 return server; 1062 1063 out_free_server: 1064 nfs_free_fattr(fattr_fsinfo); 1065 nfs_free_server(server); 1066 dprintk("<-- nfs_clone_server() = error %d\n", error); 1067 return ERR_PTR(error); 1068 } 1069 EXPORT_SYMBOL_GPL(nfs_clone_server); 1070 1071 void nfs_clients_init(struct net *net) 1072 { 1073 struct nfs_net *nn = net_generic(net, nfs_net_id); 1074 1075 INIT_LIST_HEAD(&nn->nfs_client_list); 1076 INIT_LIST_HEAD(&nn->nfs_volume_list); 1077 #if IS_ENABLED(CONFIG_NFS_V4) 1078 idr_init(&nn->cb_ident_idr); 1079 #endif 1080 spin_lock_init(&nn->nfs_client_lock); 1081 nn->boot_time = CURRENT_TIME; 1082 } 1083 1084 #ifdef CONFIG_PROC_FS 1085 static int nfs_server_list_open(struct inode *inode, struct file *file); 1086 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1087 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1088 static void nfs_server_list_stop(struct seq_file *p, void *v); 1089 static int nfs_server_list_show(struct seq_file *m, void *v); 1090 1091 static const struct seq_operations nfs_server_list_ops = { 1092 .start = nfs_server_list_start, 1093 .next = nfs_server_list_next, 1094 .stop = nfs_server_list_stop, 1095 .show = nfs_server_list_show, 1096 }; 1097 1098 static const struct file_operations nfs_server_list_fops = { 1099 .open = nfs_server_list_open, 1100 .read = seq_read, 1101 .llseek = seq_lseek, 1102 .release = seq_release_net, 1103 }; 1104 1105 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1106 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1107 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1108 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1109 static int nfs_volume_list_show(struct seq_file *m, void *v); 1110 1111 static const struct seq_operations nfs_volume_list_ops = { 1112 .start = nfs_volume_list_start, 1113 .next = nfs_volume_list_next, 1114 .stop = nfs_volume_list_stop, 1115 .show = nfs_volume_list_show, 1116 }; 1117 1118 static const struct file_operations nfs_volume_list_fops = { 1119 .open = nfs_volume_list_open, 1120 .read = seq_read, 1121 .llseek = seq_lseek, 1122 .release = seq_release_net, 1123 }; 1124 1125 /* 1126 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1127 * we're dealing 1128 */ 1129 static int nfs_server_list_open(struct inode *inode, struct file *file) 1130 { 1131 return seq_open_net(inode, file, &nfs_server_list_ops, 1132 sizeof(struct seq_net_private)); 1133 } 1134 1135 /* 1136 * set up the iterator to start reading from the server list and return the first item 1137 */ 1138 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1139 __acquires(&nn->nfs_client_lock) 1140 { 1141 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1142 1143 /* lock the list against modification */ 1144 spin_lock(&nn->nfs_client_lock); 1145 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1146 } 1147 1148 /* 1149 * move to next server 1150 */ 1151 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1152 { 1153 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1154 1155 return seq_list_next(v, &nn->nfs_client_list, pos); 1156 } 1157 1158 /* 1159 * clean up after reading from the transports list 1160 */ 1161 static void nfs_server_list_stop(struct seq_file *p, void *v) 1162 __releases(&nn->nfs_client_lock) 1163 { 1164 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1165 1166 spin_unlock(&nn->nfs_client_lock); 1167 } 1168 1169 /* 1170 * display a header line followed by a load of call lines 1171 */ 1172 static int nfs_server_list_show(struct seq_file *m, void *v) 1173 { 1174 struct nfs_client *clp; 1175 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1176 1177 /* display header on line 1 */ 1178 if (v == &nn->nfs_client_list) { 1179 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1180 return 0; 1181 } 1182 1183 /* display one transport per line on subsequent lines */ 1184 clp = list_entry(v, struct nfs_client, cl_share_link); 1185 1186 /* Check if the client is initialized */ 1187 if (clp->cl_cons_state != NFS_CS_READY) 1188 return 0; 1189 1190 rcu_read_lock(); 1191 seq_printf(m, "v%u %s %s %3d %s\n", 1192 clp->rpc_ops->version, 1193 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1194 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1195 atomic_read(&clp->cl_count), 1196 clp->cl_hostname); 1197 rcu_read_unlock(); 1198 1199 return 0; 1200 } 1201 1202 /* 1203 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1204 */ 1205 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1206 { 1207 return seq_open_net(inode, file, &nfs_volume_list_ops, 1208 sizeof(struct seq_net_private)); 1209 } 1210 1211 /* 1212 * set up the iterator to start reading from the volume list and return the first item 1213 */ 1214 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1215 __acquires(&nn->nfs_client_lock) 1216 { 1217 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1218 1219 /* lock the list against modification */ 1220 spin_lock(&nn->nfs_client_lock); 1221 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1222 } 1223 1224 /* 1225 * move to next volume 1226 */ 1227 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1228 { 1229 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1230 1231 return seq_list_next(v, &nn->nfs_volume_list, pos); 1232 } 1233 1234 /* 1235 * clean up after reading from the transports list 1236 */ 1237 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1238 __releases(&nn->nfs_client_lock) 1239 { 1240 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1241 1242 spin_unlock(&nn->nfs_client_lock); 1243 } 1244 1245 /* 1246 * display a header line followed by a load of call lines 1247 */ 1248 static int nfs_volume_list_show(struct seq_file *m, void *v) 1249 { 1250 struct nfs_server *server; 1251 struct nfs_client *clp; 1252 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1253 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1254 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1255 1256 /* display header on line 1 */ 1257 if (v == &nn->nfs_volume_list) { 1258 seq_puts(m, "NV SERVER PORT DEV FSID" 1259 " FSC\n"); 1260 return 0; 1261 } 1262 /* display one transport per line on subsequent lines */ 1263 server = list_entry(v, struct nfs_server, master_link); 1264 clp = server->nfs_client; 1265 1266 snprintf(dev, sizeof(dev), "%u:%u", 1267 MAJOR(server->s_dev), MINOR(server->s_dev)); 1268 1269 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1270 (unsigned long long) server->fsid.major, 1271 (unsigned long long) server->fsid.minor); 1272 1273 rcu_read_lock(); 1274 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1275 clp->rpc_ops->version, 1276 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1277 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1278 dev, 1279 fsid, 1280 nfs_server_fscache_state(server)); 1281 rcu_read_unlock(); 1282 1283 return 0; 1284 } 1285 1286 int nfs_fs_proc_net_init(struct net *net) 1287 { 1288 struct nfs_net *nn = net_generic(net, nfs_net_id); 1289 struct proc_dir_entry *p; 1290 1291 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1292 if (!nn->proc_nfsfs) 1293 goto error_0; 1294 1295 /* a file of servers with which we're dealing */ 1296 p = proc_create("servers", S_IFREG|S_IRUGO, 1297 nn->proc_nfsfs, &nfs_server_list_fops); 1298 if (!p) 1299 goto error_1; 1300 1301 /* a file of volumes that we have mounted */ 1302 p = proc_create("volumes", S_IFREG|S_IRUGO, 1303 nn->proc_nfsfs, &nfs_volume_list_fops); 1304 if (!p) 1305 goto error_1; 1306 return 0; 1307 1308 error_1: 1309 remove_proc_subtree("nfsfs", net->proc_net); 1310 error_0: 1311 return -ENOMEM; 1312 } 1313 1314 void nfs_fs_proc_net_exit(struct net *net) 1315 { 1316 remove_proc_subtree("nfsfs", net->proc_net); 1317 } 1318 1319 /* 1320 * initialise the /proc/fs/nfsfs/ directory 1321 */ 1322 int __init nfs_fs_proc_init(void) 1323 { 1324 if (!proc_mkdir("fs/nfsfs", NULL)) 1325 goto error_0; 1326 1327 /* a file of servers with which we're dealing */ 1328 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1329 goto error_1; 1330 1331 /* a file of volumes that we have mounted */ 1332 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1333 goto error_1; 1334 1335 return 0; 1336 error_1: 1337 remove_proc_subtree("fs/nfsfs", NULL); 1338 error_0: 1339 return -ENOMEM; 1340 } 1341 1342 /* 1343 * clean up the /proc/fs/nfsfs/ directory 1344 */ 1345 void nfs_fs_proc_exit(void) 1346 { 1347 remove_proc_subtree("fs/nfsfs", NULL); 1348 } 1349 1350 #endif /* CONFIG_PROC_FS */ 1351