1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* client.c: NFS client sharing and management code 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/sched.h> 12 #include <linux/time.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/string.h> 16 #include <linux/stat.h> 17 #include <linux/errno.h> 18 #include <linux/unistd.h> 19 #include <linux/sunrpc/addr.h> 20 #include <linux/sunrpc/clnt.h> 21 #include <linux/sunrpc/stats.h> 22 #include <linux/sunrpc/metrics.h> 23 #include <linux/sunrpc/xprtsock.h> 24 #include <linux/sunrpc/xprtrdma.h> 25 #include <linux/nfs_fs.h> 26 #include <linux/nfs_mount.h> 27 #include <linux/nfs4_mount.h> 28 #include <linux/lockd/bind.h> 29 #include <linux/seq_file.h> 30 #include <linux/mount.h> 31 #include <linux/vfs.h> 32 #include <linux/inet.h> 33 #include <linux/in6.h> 34 #include <linux/slab.h> 35 #include <linux/idr.h> 36 #include <net/ipv6.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/sunrpc/bc_xprt.h> 39 #include <linux/nsproxy.h> 40 #include <linux/pid_namespace.h> 41 42 43 #include "nfs4_fs.h" 44 #include "callback.h" 45 #include "delegation.h" 46 #include "iostat.h" 47 #include "internal.h" 48 #include "fscache.h" 49 #include "pnfs.h" 50 #include "nfs.h" 51 #include "netns.h" 52 #include "sysfs.h" 53 #include "nfs42.h" 54 55 #define NFSDBG_FACILITY NFSDBG_CLIENT 56 57 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58 static DEFINE_SPINLOCK(nfs_version_lock); 59 static DEFINE_MUTEX(nfs_version_mutex); 60 static LIST_HEAD(nfs_versions); 61 62 /* 63 * RPC cruft for NFS 64 */ 65 static const struct rpc_version *nfs_version[5] = { 66 [2] = NULL, 67 [3] = NULL, 68 [4] = NULL, 69 }; 70 71 const struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .stats = &nfs_rpcstat, 77 .pipe_dir_name = NFS_PIPE_DIRNAME, 78 }; 79 80 struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82 }; 83 84 static struct nfs_subversion *find_nfs_version(unsigned int version) 85 { 86 struct nfs_subversion *nfs; 87 spin_lock(&nfs_version_lock); 88 89 list_for_each_entry(nfs, &nfs_versions, list) { 90 if (nfs->rpc_ops->version == version) { 91 spin_unlock(&nfs_version_lock); 92 return nfs; 93 } 94 } 95 96 spin_unlock(&nfs_version_lock); 97 return ERR_PTR(-EPROTONOSUPPORT); 98 } 99 100 struct nfs_subversion *get_nfs_version(unsigned int version) 101 { 102 struct nfs_subversion *nfs = find_nfs_version(version); 103 104 if (IS_ERR(nfs)) { 105 mutex_lock(&nfs_version_mutex); 106 request_module("nfsv%d", version); 107 nfs = find_nfs_version(version); 108 mutex_unlock(&nfs_version_mutex); 109 } 110 111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 112 return ERR_PTR(-EAGAIN); 113 return nfs; 114 } 115 116 void put_nfs_version(struct nfs_subversion *nfs) 117 { 118 module_put(nfs->owner); 119 } 120 121 void register_nfs_version(struct nfs_subversion *nfs) 122 { 123 spin_lock(&nfs_version_lock); 124 125 list_add(&nfs->list, &nfs_versions); 126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 127 128 spin_unlock(&nfs_version_lock); 129 } 130 EXPORT_SYMBOL_GPL(register_nfs_version); 131 132 void unregister_nfs_version(struct nfs_subversion *nfs) 133 { 134 spin_lock(&nfs_version_lock); 135 136 nfs_version[nfs->rpc_ops->version] = NULL; 137 list_del(&nfs->list); 138 139 spin_unlock(&nfs_version_lock); 140 } 141 EXPORT_SYMBOL_GPL(unregister_nfs_version); 142 143 /* 144 * Allocate a shared client record 145 * 146 * Since these are allocated/deallocated very rarely, we don't 147 * bother putting them in a slab cache... 148 */ 149 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 150 { 151 struct nfs_client *clp; 152 int err = -ENOMEM; 153 154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 155 goto error_0; 156 157 clp->cl_minorversion = cl_init->minorversion; 158 clp->cl_nfs_mod = cl_init->nfs_mod; 159 if (!try_module_get(clp->cl_nfs_mod->owner)) 160 goto error_dealloc; 161 162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 163 164 refcount_set(&clp->cl_count, 1); 165 clp->cl_cons_state = NFS_CS_INITING; 166 167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 168 clp->cl_addrlen = cl_init->addrlen; 169 170 if (cl_init->hostname) { 171 err = -ENOMEM; 172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 173 if (!clp->cl_hostname) 174 goto error_cleanup; 175 } 176 177 INIT_LIST_HEAD(&clp->cl_superblocks); 178 clp->cl_rpcclient = ERR_PTR(-EINVAL); 179 180 clp->cl_proto = cl_init->proto; 181 clp->cl_nconnect = cl_init->nconnect; 182 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; 183 clp->cl_net = get_net(cl_init->net); 184 185 clp->cl_principal = "*"; 186 return clp; 187 188 error_cleanup: 189 put_nfs_version(clp->cl_nfs_mod); 190 error_dealloc: 191 kfree(clp); 192 error_0: 193 return ERR_PTR(err); 194 } 195 EXPORT_SYMBOL_GPL(nfs_alloc_client); 196 197 #if IS_ENABLED(CONFIG_NFS_V4) 198 static void nfs_cleanup_cb_ident_idr(struct net *net) 199 { 200 struct nfs_net *nn = net_generic(net, nfs_net_id); 201 202 idr_destroy(&nn->cb_ident_idr); 203 } 204 205 /* nfs_client_lock held */ 206 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 207 { 208 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 209 210 if (clp->cl_cb_ident) 211 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 212 } 213 214 static void pnfs_init_server(struct nfs_server *server) 215 { 216 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 217 } 218 219 #else 220 static void nfs_cleanup_cb_ident_idr(struct net *net) 221 { 222 } 223 224 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 225 { 226 } 227 228 static void pnfs_init_server(struct nfs_server *server) 229 { 230 } 231 232 #endif /* CONFIG_NFS_V4 */ 233 234 /* 235 * Destroy a shared client record 236 */ 237 void nfs_free_client(struct nfs_client *clp) 238 { 239 /* -EIO all pending I/O */ 240 if (!IS_ERR(clp->cl_rpcclient)) 241 rpc_shutdown_client(clp->cl_rpcclient); 242 243 put_net(clp->cl_net); 244 put_nfs_version(clp->cl_nfs_mod); 245 kfree(clp->cl_hostname); 246 kfree(clp->cl_acceptor); 247 kfree(clp); 248 } 249 EXPORT_SYMBOL_GPL(nfs_free_client); 250 251 /* 252 * Release a reference to a shared client record 253 */ 254 void nfs_put_client(struct nfs_client *clp) 255 { 256 struct nfs_net *nn; 257 258 if (!clp) 259 return; 260 261 nn = net_generic(clp->cl_net, nfs_net_id); 262 263 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 264 list_del(&clp->cl_share_link); 265 nfs_cb_idr_remove_locked(clp); 266 spin_unlock(&nn->nfs_client_lock); 267 268 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 269 270 clp->rpc_ops->free_client(clp); 271 } 272 } 273 EXPORT_SYMBOL_GPL(nfs_put_client); 274 275 /* 276 * Find an nfs_client on the list that matches the initialisation data 277 * that is supplied. 278 */ 279 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 280 { 281 struct nfs_client *clp; 282 const struct sockaddr *sap = data->addr; 283 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 284 int error; 285 286 again: 287 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 288 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 289 /* Don't match clients that failed to initialise properly */ 290 if (clp->cl_cons_state < 0) 291 continue; 292 293 /* If a client is still initializing then we need to wait */ 294 if (clp->cl_cons_state > NFS_CS_READY) { 295 refcount_inc(&clp->cl_count); 296 spin_unlock(&nn->nfs_client_lock); 297 error = nfs_wait_client_init_complete(clp); 298 nfs_put_client(clp); 299 spin_lock(&nn->nfs_client_lock); 300 if (error < 0) 301 return ERR_PTR(error); 302 goto again; 303 } 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; 314 315 /* Match request for a dedicated DS */ 316 if (test_bit(NFS_CS_DS, &data->init_flags) != 317 test_bit(NFS_CS_DS, &clp->cl_flags)) 318 continue; 319 320 /* Match the full socket address */ 321 if (!rpc_cmp_addr_port(sap, clap)) 322 /* Match all xprt_switch full socket addresses */ 323 if (IS_ERR(clp->cl_rpcclient) || 324 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 325 sap)) 326 continue; 327 328 refcount_inc(&clp->cl_count); 329 return clp; 330 } 331 return NULL; 332 } 333 334 /* 335 * Return true if @clp is done initializing, false if still working on it. 336 * 337 * Use nfs_client_init_status to check if it was successful. 338 */ 339 bool nfs_client_init_is_complete(const struct nfs_client *clp) 340 { 341 return clp->cl_cons_state <= NFS_CS_READY; 342 } 343 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 344 345 /* 346 * Return 0 if @clp was successfully initialized, -errno otherwise. 347 * 348 * This must be called *after* nfs_client_init_is_complete() returns true, 349 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 350 */ 351 int nfs_client_init_status(const struct nfs_client *clp) 352 { 353 /* called without checking nfs_client_init_is_complete */ 354 if (clp->cl_cons_state > NFS_CS_READY) { 355 WARN_ON_ONCE(1); 356 return -EINVAL; 357 } 358 return clp->cl_cons_state; 359 } 360 EXPORT_SYMBOL_GPL(nfs_client_init_status); 361 362 int nfs_wait_client_init_complete(const struct nfs_client *clp) 363 { 364 return wait_event_killable(nfs_client_active_wq, 365 nfs_client_init_is_complete(clp)); 366 } 367 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 368 369 /* 370 * Found an existing client. Make sure it's ready before returning. 371 */ 372 static struct nfs_client * 373 nfs_found_client(const struct nfs_client_initdata *cl_init, 374 struct nfs_client *clp) 375 { 376 int error; 377 378 error = nfs_wait_client_init_complete(clp); 379 if (error < 0) { 380 nfs_put_client(clp); 381 return ERR_PTR(-ERESTARTSYS); 382 } 383 384 if (clp->cl_cons_state < NFS_CS_READY) { 385 error = clp->cl_cons_state; 386 nfs_put_client(clp); 387 return ERR_PTR(error); 388 } 389 390 smp_rmb(); 391 return clp; 392 } 393 394 /* 395 * Look up a client by IP address and protocol version 396 * - creates a new record if one doesn't yet exist 397 */ 398 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 399 { 400 struct nfs_client *clp, *new = NULL; 401 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 402 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 403 404 if (cl_init->hostname == NULL) { 405 WARN_ON(1); 406 return ERR_PTR(-EINVAL); 407 } 408 409 /* see if the client already exists */ 410 do { 411 spin_lock(&nn->nfs_client_lock); 412 413 clp = nfs_match_client(cl_init); 414 if (clp) { 415 spin_unlock(&nn->nfs_client_lock); 416 if (new) 417 new->rpc_ops->free_client(new); 418 if (IS_ERR(clp)) 419 return clp; 420 return nfs_found_client(cl_init, clp); 421 } 422 if (new) { 423 list_add_tail(&new->cl_share_link, 424 &nn->nfs_client_list); 425 spin_unlock(&nn->nfs_client_lock); 426 new->cl_flags = cl_init->init_flags; 427 return rpc_ops->init_client(new, cl_init); 428 } 429 430 spin_unlock(&nn->nfs_client_lock); 431 432 new = rpc_ops->alloc_client(cl_init); 433 } while (!IS_ERR(new)); 434 435 return new; 436 } 437 EXPORT_SYMBOL_GPL(nfs_get_client); 438 439 /* 440 * Mark a server as ready or failed 441 */ 442 void nfs_mark_client_ready(struct nfs_client *clp, int state) 443 { 444 smp_wmb(); 445 clp->cl_cons_state = state; 446 wake_up_all(&nfs_client_active_wq); 447 } 448 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 449 450 /* 451 * Initialise the timeout values for a connection 452 */ 453 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 454 int timeo, int retrans) 455 { 456 to->to_initval = timeo * HZ / 10; 457 to->to_retries = retrans; 458 459 switch (proto) { 460 case XPRT_TRANSPORT_TCP: 461 case XPRT_TRANSPORT_RDMA: 462 if (retrans == NFS_UNSPEC_RETRANS) 463 to->to_retries = NFS_DEF_TCP_RETRANS; 464 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 465 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 466 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 467 to->to_initval = NFS_MAX_TCP_TIMEOUT; 468 to->to_increment = to->to_initval; 469 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 470 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 471 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 472 if (to->to_maxval < to->to_initval) 473 to->to_maxval = to->to_initval; 474 to->to_exponential = 0; 475 break; 476 case XPRT_TRANSPORT_UDP: 477 if (retrans == NFS_UNSPEC_RETRANS) 478 to->to_retries = NFS_DEF_UDP_RETRANS; 479 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 480 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 481 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 482 to->to_initval = NFS_MAX_UDP_TIMEOUT; 483 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 484 to->to_exponential = 1; 485 break; 486 default: 487 BUG(); 488 } 489 } 490 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 491 492 /* 493 * Create an RPC client handle 494 */ 495 int nfs_create_rpc_client(struct nfs_client *clp, 496 const struct nfs_client_initdata *cl_init, 497 rpc_authflavor_t flavor) 498 { 499 struct rpc_clnt *clnt = NULL; 500 struct rpc_create_args args = { 501 .net = clp->cl_net, 502 .protocol = clp->cl_proto, 503 .nconnect = clp->cl_nconnect, 504 .address = (struct sockaddr *)&clp->cl_addr, 505 .addrsize = clp->cl_addrlen, 506 .timeout = cl_init->timeparms, 507 .servername = clp->cl_hostname, 508 .nodename = cl_init->nodename, 509 .program = &nfs_program, 510 .version = clp->rpc_ops->version, 511 .authflavor = flavor, 512 .cred = cl_init->cred, 513 }; 514 515 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 516 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 517 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 518 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 519 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 520 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 521 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 522 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 523 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 524 args.flags |= RPC_CLNT_CREATE_NOPING; 525 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 527 528 if (!IS_ERR(clp->cl_rpcclient)) 529 return 0; 530 531 clnt = rpc_create(&args); 532 if (IS_ERR(clnt)) { 533 dprintk("%s: cannot create RPC client. Error = %ld\n", 534 __func__, PTR_ERR(clnt)); 535 return PTR_ERR(clnt); 536 } 537 538 clnt->cl_principal = clp->cl_principal; 539 clp->cl_rpcclient = clnt; 540 clnt->cl_max_connect = clp->cl_max_connect; 541 return 0; 542 } 543 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 544 545 /* 546 * Version 2 or 3 client destruction 547 */ 548 static void nfs_destroy_server(struct nfs_server *server) 549 { 550 if (server->nlm_host) 551 nlmclnt_done(server->nlm_host); 552 } 553 554 /* 555 * Version 2 or 3 lockd setup 556 */ 557 static int nfs_start_lockd(struct nfs_server *server) 558 { 559 struct nlm_host *host; 560 struct nfs_client *clp = server->nfs_client; 561 struct nlmclnt_initdata nlm_init = { 562 .hostname = clp->cl_hostname, 563 .address = (struct sockaddr *)&clp->cl_addr, 564 .addrlen = clp->cl_addrlen, 565 .nfs_version = clp->rpc_ops->version, 566 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 567 1 : 0, 568 .net = clp->cl_net, 569 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 570 .cred = server->cred, 571 }; 572 573 if (nlm_init.nfs_version > 3) 574 return 0; 575 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 576 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 577 return 0; 578 579 switch (clp->cl_proto) { 580 default: 581 nlm_init.protocol = IPPROTO_TCP; 582 break; 583 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 584 case XPRT_TRANSPORT_UDP: 585 nlm_init.protocol = IPPROTO_UDP; 586 #endif 587 } 588 589 host = nlmclnt_init(&nlm_init); 590 if (IS_ERR(host)) 591 return PTR_ERR(host); 592 593 server->nlm_host = host; 594 server->destroy = nfs_destroy_server; 595 return 0; 596 } 597 598 /* 599 * Create a general RPC client 600 */ 601 int nfs_init_server_rpcclient(struct nfs_server *server, 602 const struct rpc_timeout *timeo, 603 rpc_authflavor_t pseudoflavour) 604 { 605 struct nfs_client *clp = server->nfs_client; 606 607 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 608 pseudoflavour); 609 if (IS_ERR(server->client)) { 610 dprintk("%s: couldn't create rpc_client!\n", __func__); 611 return PTR_ERR(server->client); 612 } 613 614 memcpy(&server->client->cl_timeout_default, 615 timeo, 616 sizeof(server->client->cl_timeout_default)); 617 server->client->cl_timeout = &server->client->cl_timeout_default; 618 server->client->cl_softrtry = 0; 619 if (server->flags & NFS_MOUNT_SOFTERR) 620 server->client->cl_softerr = 1; 621 if (server->flags & NFS_MOUNT_SOFT) 622 server->client->cl_softrtry = 1; 623 624 return 0; 625 } 626 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 627 628 /** 629 * nfs_init_client - Initialise an NFS2 or NFS3 client 630 * 631 * @clp: nfs_client to initialise 632 * @cl_init: Initialisation parameters 633 * 634 * Returns pointer to an NFS client, or an ERR_PTR value. 635 */ 636 struct nfs_client *nfs_init_client(struct nfs_client *clp, 637 const struct nfs_client_initdata *cl_init) 638 { 639 int error; 640 641 /* the client is already initialised */ 642 if (clp->cl_cons_state == NFS_CS_READY) 643 return clp; 644 645 /* 646 * Create a client RPC handle for doing FSSTAT with UNIX auth only 647 * - RFC 2623, sec 2.3.2 648 */ 649 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 650 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 651 if (error < 0) { 652 nfs_put_client(clp); 653 clp = ERR_PTR(error); 654 } 655 return clp; 656 } 657 EXPORT_SYMBOL_GPL(nfs_init_client); 658 659 /* 660 * Create a version 2 or 3 client 661 */ 662 static int nfs_init_server(struct nfs_server *server, 663 const struct fs_context *fc) 664 { 665 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 666 struct rpc_timeout timeparms; 667 struct nfs_client_initdata cl_init = { 668 .hostname = ctx->nfs_server.hostname, 669 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 670 .addrlen = ctx->nfs_server.addrlen, 671 .nfs_mod = ctx->nfs_mod, 672 .proto = ctx->nfs_server.protocol, 673 .net = fc->net_ns, 674 .timeparms = &timeparms, 675 .cred = server->cred, 676 .nconnect = ctx->nfs_server.nconnect, 677 .init_flags = (1UL << NFS_CS_REUSEPORT), 678 }; 679 struct nfs_client *clp; 680 int error; 681 682 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 683 ctx->timeo, ctx->retrans); 684 if (ctx->flags & NFS_MOUNT_NORESVPORT) 685 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 686 687 /* Allocate or find a client reference we can use */ 688 clp = nfs_get_client(&cl_init); 689 if (IS_ERR(clp)) 690 return PTR_ERR(clp); 691 692 server->nfs_client = clp; 693 694 /* Initialise the client representation from the mount data */ 695 server->flags = ctx->flags; 696 server->options = ctx->options; 697 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 698 699 switch (clp->rpc_ops->version) { 700 case 2: 701 server->fattr_valid = NFS_ATTR_FATTR_V2; 702 break; 703 case 3: 704 server->fattr_valid = NFS_ATTR_FATTR_V3; 705 break; 706 default: 707 server->fattr_valid = NFS_ATTR_FATTR_V4; 708 } 709 710 if (ctx->rsize) 711 server->rsize = nfs_block_size(ctx->rsize, NULL); 712 if (ctx->wsize) 713 server->wsize = nfs_block_size(ctx->wsize, NULL); 714 715 server->acregmin = ctx->acregmin * HZ; 716 server->acregmax = ctx->acregmax * HZ; 717 server->acdirmin = ctx->acdirmin * HZ; 718 server->acdirmax = ctx->acdirmax * HZ; 719 720 /* Start lockd here, before we might error out */ 721 error = nfs_start_lockd(server); 722 if (error < 0) 723 goto error; 724 725 server->port = ctx->nfs_server.port; 726 server->auth_info = ctx->auth_info; 727 728 error = nfs_init_server_rpcclient(server, &timeparms, 729 ctx->selected_flavor); 730 if (error < 0) 731 goto error; 732 733 /* Preserve the values of mount_server-related mount options */ 734 if (ctx->mount_server.addrlen) { 735 memcpy(&server->mountd_address, &ctx->mount_server.address, 736 ctx->mount_server.addrlen); 737 server->mountd_addrlen = ctx->mount_server.addrlen; 738 } 739 server->mountd_version = ctx->mount_server.version; 740 server->mountd_port = ctx->mount_server.port; 741 server->mountd_protocol = ctx->mount_server.protocol; 742 743 server->namelen = ctx->namlen; 744 return 0; 745 746 error: 747 server->nfs_client = NULL; 748 nfs_put_client(clp); 749 return error; 750 } 751 752 /* 753 * Load up the server record from information gained in an fsinfo record 754 */ 755 static void nfs_server_set_fsinfo(struct nfs_server *server, 756 struct nfs_fsinfo *fsinfo) 757 { 758 unsigned long max_rpc_payload, raw_max_rpc_payload; 759 760 /* Work out a lot of parameters */ 761 if (server->rsize == 0) 762 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 763 if (server->wsize == 0) 764 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 765 766 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 767 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 768 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 769 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 770 771 raw_max_rpc_payload = rpc_max_payload(server->client); 772 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 773 774 if (server->rsize > max_rpc_payload) 775 server->rsize = max_rpc_payload; 776 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 777 server->rsize = NFS_MAX_FILE_IO_SIZE; 778 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 779 780 if (server->wsize > max_rpc_payload) 781 server->wsize = max_rpc_payload; 782 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 783 server->wsize = NFS_MAX_FILE_IO_SIZE; 784 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 785 786 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 787 788 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 789 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 790 server->dtsize = NFS_MAX_FILE_IO_SIZE; 791 if (server->dtsize > server->rsize) 792 server->dtsize = server->rsize; 793 794 if (server->flags & NFS_MOUNT_NOAC) { 795 server->acregmin = server->acregmax = 0; 796 server->acdirmin = server->acdirmax = 0; 797 } 798 799 server->maxfilesize = fsinfo->maxfilesize; 800 801 server->time_delta = fsinfo->time_delta; 802 server->change_attr_type = fsinfo->change_attr_type; 803 804 server->clone_blksize = fsinfo->clone_blksize; 805 /* We're airborne Set socket buffersize */ 806 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 807 808 #ifdef CONFIG_NFS_V4_2 809 /* 810 * Defaults until limited by the session parameters. 811 */ 812 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 813 XATTR_SIZE_MAX); 814 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 815 XATTR_SIZE_MAX); 816 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 817 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 818 819 if (fsinfo->xattr_support) 820 server->caps |= NFS_CAP_XATTR; 821 #endif 822 } 823 824 /* 825 * Probe filesystem information, including the FSID on v2/v3 826 */ 827 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 828 { 829 struct nfs_fsinfo fsinfo; 830 struct nfs_client *clp = server->nfs_client; 831 int error; 832 833 if (clp->rpc_ops->set_capabilities != NULL) { 834 error = clp->rpc_ops->set_capabilities(server, mntfh); 835 if (error < 0) 836 return error; 837 } 838 839 fsinfo.fattr = fattr; 840 fsinfo.nlayouttypes = 0; 841 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 842 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 843 if (error < 0) 844 return error; 845 846 nfs_server_set_fsinfo(server, &fsinfo); 847 848 /* Get some general file system info */ 849 if (server->namelen == 0) { 850 struct nfs_pathconf pathinfo; 851 852 pathinfo.fattr = fattr; 853 nfs_fattr_init(fattr); 854 855 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 856 server->namelen = pathinfo.max_namelen; 857 } 858 859 return 0; 860 } 861 862 /* 863 * Grab the destination's particulars, including lease expiry time. 864 * 865 * Returns zero if probe succeeded and retrieved FSID matches the FSID 866 * we have cached. 867 */ 868 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 869 { 870 struct nfs_fattr *fattr; 871 int error; 872 873 fattr = nfs_alloc_fattr(); 874 if (fattr == NULL) 875 return -ENOMEM; 876 877 /* Sanity: the probe won't work if the destination server 878 * does not recognize the migrated FH. */ 879 error = nfs_probe_fsinfo(server, mntfh, fattr); 880 881 nfs_free_fattr(fattr); 882 return error; 883 } 884 EXPORT_SYMBOL_GPL(nfs_probe_server); 885 886 /* 887 * Copy useful information when duplicating a server record 888 */ 889 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 890 { 891 target->flags = source->flags; 892 target->rsize = source->rsize; 893 target->wsize = source->wsize; 894 target->acregmin = source->acregmin; 895 target->acregmax = source->acregmax; 896 target->acdirmin = source->acdirmin; 897 target->acdirmax = source->acdirmax; 898 target->caps = source->caps; 899 target->options = source->options; 900 target->auth_info = source->auth_info; 901 target->port = source->port; 902 } 903 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 904 905 void nfs_server_insert_lists(struct nfs_server *server) 906 { 907 struct nfs_client *clp = server->nfs_client; 908 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 909 910 spin_lock(&nn->nfs_client_lock); 911 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 912 list_add_tail(&server->master_link, &nn->nfs_volume_list); 913 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 914 spin_unlock(&nn->nfs_client_lock); 915 916 } 917 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 918 919 void nfs_server_remove_lists(struct nfs_server *server) 920 { 921 struct nfs_client *clp = server->nfs_client; 922 struct nfs_net *nn; 923 924 if (clp == NULL) 925 return; 926 nn = net_generic(clp->cl_net, nfs_net_id); 927 spin_lock(&nn->nfs_client_lock); 928 list_del_rcu(&server->client_link); 929 if (list_empty(&clp->cl_superblocks)) 930 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 931 list_del(&server->master_link); 932 spin_unlock(&nn->nfs_client_lock); 933 934 synchronize_rcu(); 935 } 936 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 937 938 /* 939 * Allocate and initialise a server record 940 */ 941 struct nfs_server *nfs_alloc_server(void) 942 { 943 struct nfs_server *server; 944 945 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 946 if (!server) 947 return NULL; 948 949 server->client = server->client_acl = ERR_PTR(-EINVAL); 950 951 /* Zero out the NFS state stuff */ 952 INIT_LIST_HEAD(&server->client_link); 953 INIT_LIST_HEAD(&server->master_link); 954 INIT_LIST_HEAD(&server->delegations); 955 INIT_LIST_HEAD(&server->layouts); 956 INIT_LIST_HEAD(&server->state_owners_lru); 957 INIT_LIST_HEAD(&server->ss_copies); 958 959 atomic_set(&server->active, 0); 960 961 server->io_stats = nfs_alloc_iostats(); 962 if (!server->io_stats) { 963 kfree(server); 964 return NULL; 965 } 966 967 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 968 969 ida_init(&server->openowner_id); 970 ida_init(&server->lockowner_id); 971 pnfs_init_server(server); 972 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 973 974 return server; 975 } 976 EXPORT_SYMBOL_GPL(nfs_alloc_server); 977 978 /* 979 * Free up a server record 980 */ 981 void nfs_free_server(struct nfs_server *server) 982 { 983 nfs_server_remove_lists(server); 984 985 if (server->destroy != NULL) 986 server->destroy(server); 987 988 if (!IS_ERR(server->client_acl)) 989 rpc_shutdown_client(server->client_acl); 990 if (!IS_ERR(server->client)) 991 rpc_shutdown_client(server->client); 992 993 nfs_put_client(server->nfs_client); 994 995 ida_destroy(&server->lockowner_id); 996 ida_destroy(&server->openowner_id); 997 nfs_free_iostats(server->io_stats); 998 put_cred(server->cred); 999 kfree(server); 1000 nfs_release_automount_timer(); 1001 } 1002 EXPORT_SYMBOL_GPL(nfs_free_server); 1003 1004 /* 1005 * Create a version 2 or 3 volume record 1006 * - keyed on server and FSID 1007 */ 1008 struct nfs_server *nfs_create_server(struct fs_context *fc) 1009 { 1010 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1011 struct nfs_server *server; 1012 struct nfs_fattr *fattr; 1013 int error; 1014 1015 server = nfs_alloc_server(); 1016 if (!server) 1017 return ERR_PTR(-ENOMEM); 1018 1019 server->cred = get_cred(fc->cred); 1020 1021 error = -ENOMEM; 1022 fattr = nfs_alloc_fattr(); 1023 if (fattr == NULL) 1024 goto error; 1025 1026 /* Get a client representation */ 1027 error = nfs_init_server(server, fc); 1028 if (error < 0) 1029 goto error; 1030 1031 /* Probe the root fh to retrieve its FSID */ 1032 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1033 if (error < 0) 1034 goto error; 1035 if (server->nfs_client->rpc_ops->version == 3) { 1036 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1037 server->namelen = NFS3_MAXNAMLEN; 1038 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1039 server->caps |= NFS_CAP_READDIRPLUS; 1040 } else { 1041 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1042 server->namelen = NFS2_MAXNAMLEN; 1043 } 1044 1045 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1046 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1047 fattr, NULL); 1048 if (error < 0) { 1049 dprintk("nfs_create_server: getattr error = %d\n", -error); 1050 goto error; 1051 } 1052 } 1053 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1054 1055 dprintk("Server FSID: %llx:%llx\n", 1056 (unsigned long long) server->fsid.major, 1057 (unsigned long long) server->fsid.minor); 1058 1059 nfs_server_insert_lists(server); 1060 server->mount_time = jiffies; 1061 nfs_free_fattr(fattr); 1062 return server; 1063 1064 error: 1065 nfs_free_fattr(fattr); 1066 nfs_free_server(server); 1067 return ERR_PTR(error); 1068 } 1069 EXPORT_SYMBOL_GPL(nfs_create_server); 1070 1071 /* 1072 * Clone an NFS2, NFS3 or NFS4 server record 1073 */ 1074 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1075 struct nfs_fh *fh, 1076 struct nfs_fattr *fattr, 1077 rpc_authflavor_t flavor) 1078 { 1079 struct nfs_server *server; 1080 int error; 1081 1082 server = nfs_alloc_server(); 1083 if (!server) 1084 return ERR_PTR(-ENOMEM); 1085 1086 server->cred = get_cred(source->cred); 1087 1088 /* Copy data from the source */ 1089 server->nfs_client = source->nfs_client; 1090 server->destroy = source->destroy; 1091 refcount_inc(&server->nfs_client->cl_count); 1092 nfs_server_copy_userdata(server, source); 1093 1094 server->fsid = fattr->fsid; 1095 1096 error = nfs_init_server_rpcclient(server, 1097 source->client->cl_timeout, 1098 flavor); 1099 if (error < 0) 1100 goto out_free_server; 1101 1102 /* probe the filesystem info for this server filesystem */ 1103 error = nfs_probe_server(server, fh); 1104 if (error < 0) 1105 goto out_free_server; 1106 1107 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1108 server->namelen = NFS4_MAXNAMLEN; 1109 1110 error = nfs_start_lockd(server); 1111 if (error < 0) 1112 goto out_free_server; 1113 1114 nfs_server_insert_lists(server); 1115 server->mount_time = jiffies; 1116 1117 return server; 1118 1119 out_free_server: 1120 nfs_free_server(server); 1121 return ERR_PTR(error); 1122 } 1123 EXPORT_SYMBOL_GPL(nfs_clone_server); 1124 1125 void nfs_clients_init(struct net *net) 1126 { 1127 struct nfs_net *nn = net_generic(net, nfs_net_id); 1128 1129 INIT_LIST_HEAD(&nn->nfs_client_list); 1130 INIT_LIST_HEAD(&nn->nfs_volume_list); 1131 #if IS_ENABLED(CONFIG_NFS_V4) 1132 idr_init(&nn->cb_ident_idr); 1133 #endif 1134 spin_lock_init(&nn->nfs_client_lock); 1135 nn->boot_time = ktime_get_real(); 1136 1137 nfs_netns_sysfs_setup(nn, net); 1138 } 1139 1140 void nfs_clients_exit(struct net *net) 1141 { 1142 struct nfs_net *nn = net_generic(net, nfs_net_id); 1143 1144 nfs_netns_sysfs_destroy(nn); 1145 nfs_cleanup_cb_ident_idr(net); 1146 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1147 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1148 } 1149 1150 #ifdef CONFIG_PROC_FS 1151 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1152 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1153 static void nfs_server_list_stop(struct seq_file *p, void *v); 1154 static int nfs_server_list_show(struct seq_file *m, void *v); 1155 1156 static const struct seq_operations nfs_server_list_ops = { 1157 .start = nfs_server_list_start, 1158 .next = nfs_server_list_next, 1159 .stop = nfs_server_list_stop, 1160 .show = nfs_server_list_show, 1161 }; 1162 1163 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1164 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1165 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1166 static int nfs_volume_list_show(struct seq_file *m, void *v); 1167 1168 static const struct seq_operations nfs_volume_list_ops = { 1169 .start = nfs_volume_list_start, 1170 .next = nfs_volume_list_next, 1171 .stop = nfs_volume_list_stop, 1172 .show = nfs_volume_list_show, 1173 }; 1174 1175 /* 1176 * set up the iterator to start reading from the server list and return the first item 1177 */ 1178 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1179 __acquires(&nn->nfs_client_lock) 1180 { 1181 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1182 1183 /* lock the list against modification */ 1184 spin_lock(&nn->nfs_client_lock); 1185 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1186 } 1187 1188 /* 1189 * move to next server 1190 */ 1191 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1192 { 1193 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1194 1195 return seq_list_next(v, &nn->nfs_client_list, pos); 1196 } 1197 1198 /* 1199 * clean up after reading from the transports list 1200 */ 1201 static void nfs_server_list_stop(struct seq_file *p, void *v) 1202 __releases(&nn->nfs_client_lock) 1203 { 1204 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1205 1206 spin_unlock(&nn->nfs_client_lock); 1207 } 1208 1209 /* 1210 * display a header line followed by a load of call lines 1211 */ 1212 static int nfs_server_list_show(struct seq_file *m, void *v) 1213 { 1214 struct nfs_client *clp; 1215 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1216 1217 /* display header on line 1 */ 1218 if (v == &nn->nfs_client_list) { 1219 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1220 return 0; 1221 } 1222 1223 /* display one transport per line on subsequent lines */ 1224 clp = list_entry(v, struct nfs_client, cl_share_link); 1225 1226 /* Check if the client is initialized */ 1227 if (clp->cl_cons_state != NFS_CS_READY) 1228 return 0; 1229 1230 rcu_read_lock(); 1231 seq_printf(m, "v%u %s %s %3d %s\n", 1232 clp->rpc_ops->version, 1233 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1234 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1235 refcount_read(&clp->cl_count), 1236 clp->cl_hostname); 1237 rcu_read_unlock(); 1238 1239 return 0; 1240 } 1241 1242 /* 1243 * set up the iterator to start reading from the volume list and return the first item 1244 */ 1245 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1246 __acquires(&nn->nfs_client_lock) 1247 { 1248 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1249 1250 /* lock the list against modification */ 1251 spin_lock(&nn->nfs_client_lock); 1252 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1253 } 1254 1255 /* 1256 * move to next volume 1257 */ 1258 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1259 { 1260 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1261 1262 return seq_list_next(v, &nn->nfs_volume_list, pos); 1263 } 1264 1265 /* 1266 * clean up after reading from the transports list 1267 */ 1268 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1269 __releases(&nn->nfs_client_lock) 1270 { 1271 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1272 1273 spin_unlock(&nn->nfs_client_lock); 1274 } 1275 1276 /* 1277 * display a header line followed by a load of call lines 1278 */ 1279 static int nfs_volume_list_show(struct seq_file *m, void *v) 1280 { 1281 struct nfs_server *server; 1282 struct nfs_client *clp; 1283 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1284 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1285 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1286 1287 /* display header on line 1 */ 1288 if (v == &nn->nfs_volume_list) { 1289 seq_puts(m, "NV SERVER PORT DEV FSID" 1290 " FSC\n"); 1291 return 0; 1292 } 1293 /* display one transport per line on subsequent lines */ 1294 server = list_entry(v, struct nfs_server, master_link); 1295 clp = server->nfs_client; 1296 1297 snprintf(dev, sizeof(dev), "%u:%u", 1298 MAJOR(server->s_dev), MINOR(server->s_dev)); 1299 1300 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1301 (unsigned long long) server->fsid.major, 1302 (unsigned long long) server->fsid.minor); 1303 1304 rcu_read_lock(); 1305 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1306 clp->rpc_ops->version, 1307 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1308 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1309 dev, 1310 fsid, 1311 nfs_server_fscache_state(server)); 1312 rcu_read_unlock(); 1313 1314 return 0; 1315 } 1316 1317 int nfs_fs_proc_net_init(struct net *net) 1318 { 1319 struct nfs_net *nn = net_generic(net, nfs_net_id); 1320 struct proc_dir_entry *p; 1321 1322 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1323 if (!nn->proc_nfsfs) 1324 goto error_0; 1325 1326 /* a file of servers with which we're dealing */ 1327 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1328 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1329 if (!p) 1330 goto error_1; 1331 1332 /* a file of volumes that we have mounted */ 1333 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1334 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1335 if (!p) 1336 goto error_1; 1337 return 0; 1338 1339 error_1: 1340 remove_proc_subtree("nfsfs", net->proc_net); 1341 error_0: 1342 return -ENOMEM; 1343 } 1344 1345 void nfs_fs_proc_net_exit(struct net *net) 1346 { 1347 remove_proc_subtree("nfsfs", net->proc_net); 1348 } 1349 1350 /* 1351 * initialise the /proc/fs/nfsfs/ directory 1352 */ 1353 int __init nfs_fs_proc_init(void) 1354 { 1355 if (!proc_mkdir("fs/nfsfs", NULL)) 1356 goto error_0; 1357 1358 /* a file of servers with which we're dealing */ 1359 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1360 goto error_1; 1361 1362 /* a file of volumes that we have mounted */ 1363 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1364 goto error_1; 1365 1366 return 0; 1367 error_1: 1368 remove_proc_subtree("fs/nfsfs", NULL); 1369 error_0: 1370 return -ENOMEM; 1371 } 1372 1373 /* 1374 * clean up the /proc/fs/nfsfs/ directory 1375 */ 1376 void nfs_fs_proc_exit(void) 1377 { 1378 remove_proc_subtree("fs/nfsfs", NULL); 1379 } 1380 1381 #endif /* CONFIG_PROC_FS */ 1382