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 nfs_fscache_get_client_cookie(clp); 187 188 return clp; 189 190 error_cleanup: 191 put_nfs_version(clp->cl_nfs_mod); 192 error_dealloc: 193 kfree(clp); 194 error_0: 195 return ERR_PTR(err); 196 } 197 EXPORT_SYMBOL_GPL(nfs_alloc_client); 198 199 #if IS_ENABLED(CONFIG_NFS_V4) 200 static void nfs_cleanup_cb_ident_idr(struct net *net) 201 { 202 struct nfs_net *nn = net_generic(net, nfs_net_id); 203 204 idr_destroy(&nn->cb_ident_idr); 205 } 206 207 /* nfs_client_lock held */ 208 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 209 { 210 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 211 212 if (clp->cl_cb_ident) 213 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 214 } 215 216 static void pnfs_init_server(struct nfs_server *server) 217 { 218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 219 } 220 221 #else 222 static void nfs_cleanup_cb_ident_idr(struct net *net) 223 { 224 } 225 226 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 227 { 228 } 229 230 static void pnfs_init_server(struct nfs_server *server) 231 { 232 } 233 234 #endif /* CONFIG_NFS_V4 */ 235 236 /* 237 * Destroy a shared client record 238 */ 239 void nfs_free_client(struct nfs_client *clp) 240 { 241 nfs_fscache_release_client_cookie(clp); 242 243 /* -EIO all pending I/O */ 244 if (!IS_ERR(clp->cl_rpcclient)) 245 rpc_shutdown_client(clp->cl_rpcclient); 246 247 put_net(clp->cl_net); 248 put_nfs_version(clp->cl_nfs_mod); 249 kfree(clp->cl_hostname); 250 kfree(clp->cl_acceptor); 251 kfree(clp); 252 } 253 EXPORT_SYMBOL_GPL(nfs_free_client); 254 255 /* 256 * Release a reference to a shared client record 257 */ 258 void nfs_put_client(struct nfs_client *clp) 259 { 260 struct nfs_net *nn; 261 262 if (!clp) 263 return; 264 265 nn = net_generic(clp->cl_net, nfs_net_id); 266 267 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 268 list_del(&clp->cl_share_link); 269 nfs_cb_idr_remove_locked(clp); 270 spin_unlock(&nn->nfs_client_lock); 271 272 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 273 274 clp->rpc_ops->free_client(clp); 275 } 276 } 277 EXPORT_SYMBOL_GPL(nfs_put_client); 278 279 /* 280 * Find an nfs_client on the list that matches the initialisation data 281 * that is supplied. 282 */ 283 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 284 { 285 struct nfs_client *clp; 286 const struct sockaddr *sap = data->addr; 287 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 288 int error; 289 290 again: 291 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 292 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 293 /* Don't match clients that failed to initialise properly */ 294 if (clp->cl_cons_state < 0) 295 continue; 296 297 /* If a client is still initializing then we need to wait */ 298 if (clp->cl_cons_state > NFS_CS_READY) { 299 refcount_inc(&clp->cl_count); 300 spin_unlock(&nn->nfs_client_lock); 301 error = nfs_wait_client_init_complete(clp); 302 nfs_put_client(clp); 303 spin_lock(&nn->nfs_client_lock); 304 if (error < 0) 305 return ERR_PTR(error); 306 goto again; 307 } 308 309 /* Different NFS versions cannot share the same nfs_client */ 310 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 311 continue; 312 313 if (clp->cl_proto != data->proto) 314 continue; 315 /* Match nfsv4 minorversion */ 316 if (clp->cl_minorversion != data->minorversion) 317 continue; 318 319 /* Match request for a dedicated DS */ 320 if (test_bit(NFS_CS_DS, &data->init_flags) != 321 test_bit(NFS_CS_DS, &clp->cl_flags)) 322 continue; 323 324 /* Match the full socket address */ 325 if (!rpc_cmp_addr_port(sap, clap)) 326 /* Match all xprt_switch full socket addresses */ 327 if (IS_ERR(clp->cl_rpcclient) || 328 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 329 sap)) 330 continue; 331 332 refcount_inc(&clp->cl_count); 333 return clp; 334 } 335 return NULL; 336 } 337 338 /* 339 * Return true if @clp is done initializing, false if still working on it. 340 * 341 * Use nfs_client_init_status to check if it was successful. 342 */ 343 bool nfs_client_init_is_complete(const struct nfs_client *clp) 344 { 345 return clp->cl_cons_state <= NFS_CS_READY; 346 } 347 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 348 349 /* 350 * Return 0 if @clp was successfully initialized, -errno otherwise. 351 * 352 * This must be called *after* nfs_client_init_is_complete() returns true, 353 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 354 */ 355 int nfs_client_init_status(const struct nfs_client *clp) 356 { 357 /* called without checking nfs_client_init_is_complete */ 358 if (clp->cl_cons_state > NFS_CS_READY) { 359 WARN_ON_ONCE(1); 360 return -EINVAL; 361 } 362 return clp->cl_cons_state; 363 } 364 EXPORT_SYMBOL_GPL(nfs_client_init_status); 365 366 int nfs_wait_client_init_complete(const struct nfs_client *clp) 367 { 368 return wait_event_killable(nfs_client_active_wq, 369 nfs_client_init_is_complete(clp)); 370 } 371 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 372 373 /* 374 * Found an existing client. Make sure it's ready before returning. 375 */ 376 static struct nfs_client * 377 nfs_found_client(const struct nfs_client_initdata *cl_init, 378 struct nfs_client *clp) 379 { 380 int error; 381 382 error = nfs_wait_client_init_complete(clp); 383 if (error < 0) { 384 nfs_put_client(clp); 385 return ERR_PTR(-ERESTARTSYS); 386 } 387 388 if (clp->cl_cons_state < NFS_CS_READY) { 389 error = clp->cl_cons_state; 390 nfs_put_client(clp); 391 return ERR_PTR(error); 392 } 393 394 smp_rmb(); 395 return clp; 396 } 397 398 /* 399 * Look up a client by IP address and protocol version 400 * - creates a new record if one doesn't yet exist 401 */ 402 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 403 { 404 struct nfs_client *clp, *new = NULL; 405 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 406 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 407 408 if (cl_init->hostname == NULL) { 409 WARN_ON(1); 410 return ERR_PTR(-EINVAL); 411 } 412 413 /* see if the client already exists */ 414 do { 415 spin_lock(&nn->nfs_client_lock); 416 417 clp = nfs_match_client(cl_init); 418 if (clp) { 419 spin_unlock(&nn->nfs_client_lock); 420 if (new) 421 new->rpc_ops->free_client(new); 422 if (IS_ERR(clp)) 423 return clp; 424 return nfs_found_client(cl_init, clp); 425 } 426 if (new) { 427 list_add_tail(&new->cl_share_link, 428 &nn->nfs_client_list); 429 spin_unlock(&nn->nfs_client_lock); 430 new->cl_flags = cl_init->init_flags; 431 return rpc_ops->init_client(new, cl_init); 432 } 433 434 spin_unlock(&nn->nfs_client_lock); 435 436 new = rpc_ops->alloc_client(cl_init); 437 } while (!IS_ERR(new)); 438 439 return new; 440 } 441 EXPORT_SYMBOL_GPL(nfs_get_client); 442 443 /* 444 * Mark a server as ready or failed 445 */ 446 void nfs_mark_client_ready(struct nfs_client *clp, int state) 447 { 448 smp_wmb(); 449 clp->cl_cons_state = state; 450 wake_up_all(&nfs_client_active_wq); 451 } 452 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 453 454 /* 455 * Initialise the timeout values for a connection 456 */ 457 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 458 int timeo, int retrans) 459 { 460 to->to_initval = timeo * HZ / 10; 461 to->to_retries = retrans; 462 463 switch (proto) { 464 case XPRT_TRANSPORT_TCP: 465 case XPRT_TRANSPORT_RDMA: 466 if (retrans == NFS_UNSPEC_RETRANS) 467 to->to_retries = NFS_DEF_TCP_RETRANS; 468 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 469 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 470 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 471 to->to_initval = NFS_MAX_TCP_TIMEOUT; 472 to->to_increment = to->to_initval; 473 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 474 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 475 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 476 if (to->to_maxval < to->to_initval) 477 to->to_maxval = to->to_initval; 478 to->to_exponential = 0; 479 break; 480 case XPRT_TRANSPORT_UDP: 481 if (retrans == NFS_UNSPEC_RETRANS) 482 to->to_retries = NFS_DEF_UDP_RETRANS; 483 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 484 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 485 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 486 to->to_initval = NFS_MAX_UDP_TIMEOUT; 487 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 488 to->to_exponential = 1; 489 break; 490 default: 491 BUG(); 492 } 493 } 494 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 495 496 /* 497 * Create an RPC client handle 498 */ 499 int nfs_create_rpc_client(struct nfs_client *clp, 500 const struct nfs_client_initdata *cl_init, 501 rpc_authflavor_t flavor) 502 { 503 struct rpc_clnt *clnt = NULL; 504 struct rpc_create_args args = { 505 .net = clp->cl_net, 506 .protocol = clp->cl_proto, 507 .nconnect = clp->cl_nconnect, 508 .address = (struct sockaddr *)&clp->cl_addr, 509 .addrsize = clp->cl_addrlen, 510 .timeout = cl_init->timeparms, 511 .servername = clp->cl_hostname, 512 .nodename = cl_init->nodename, 513 .program = &nfs_program, 514 .version = clp->rpc_ops->version, 515 .authflavor = flavor, 516 .cred = cl_init->cred, 517 }; 518 519 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 520 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 521 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 522 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 523 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 524 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 525 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 527 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 528 args.flags |= RPC_CLNT_CREATE_NOPING; 529 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 530 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 531 532 if (!IS_ERR(clp->cl_rpcclient)) 533 return 0; 534 535 clnt = rpc_create(&args); 536 if (IS_ERR(clnt)) { 537 dprintk("%s: cannot create RPC client. Error = %ld\n", 538 __func__, PTR_ERR(clnt)); 539 return PTR_ERR(clnt); 540 } 541 542 clnt->cl_principal = clp->cl_principal; 543 clp->cl_rpcclient = clnt; 544 clnt->cl_max_connect = clp->cl_max_connect; 545 return 0; 546 } 547 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 548 549 /* 550 * Version 2 or 3 client destruction 551 */ 552 static void nfs_destroy_server(struct nfs_server *server) 553 { 554 if (server->nlm_host) 555 nlmclnt_done(server->nlm_host); 556 } 557 558 /* 559 * Version 2 or 3 lockd setup 560 */ 561 static int nfs_start_lockd(struct nfs_server *server) 562 { 563 struct nlm_host *host; 564 struct nfs_client *clp = server->nfs_client; 565 struct nlmclnt_initdata nlm_init = { 566 .hostname = clp->cl_hostname, 567 .address = (struct sockaddr *)&clp->cl_addr, 568 .addrlen = clp->cl_addrlen, 569 .nfs_version = clp->rpc_ops->version, 570 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 571 1 : 0, 572 .net = clp->cl_net, 573 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 574 .cred = server->cred, 575 }; 576 577 if (nlm_init.nfs_version > 3) 578 return 0; 579 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 580 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 581 return 0; 582 583 switch (clp->cl_proto) { 584 default: 585 nlm_init.protocol = IPPROTO_TCP; 586 break; 587 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 588 case XPRT_TRANSPORT_UDP: 589 nlm_init.protocol = IPPROTO_UDP; 590 #endif 591 } 592 593 host = nlmclnt_init(&nlm_init); 594 if (IS_ERR(host)) 595 return PTR_ERR(host); 596 597 server->nlm_host = host; 598 server->destroy = nfs_destroy_server; 599 return 0; 600 } 601 602 /* 603 * Create a general RPC client 604 */ 605 int nfs_init_server_rpcclient(struct nfs_server *server, 606 const struct rpc_timeout *timeo, 607 rpc_authflavor_t pseudoflavour) 608 { 609 struct nfs_client *clp = server->nfs_client; 610 611 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 612 pseudoflavour); 613 if (IS_ERR(server->client)) { 614 dprintk("%s: couldn't create rpc_client!\n", __func__); 615 return PTR_ERR(server->client); 616 } 617 618 memcpy(&server->client->cl_timeout_default, 619 timeo, 620 sizeof(server->client->cl_timeout_default)); 621 server->client->cl_timeout = &server->client->cl_timeout_default; 622 server->client->cl_softrtry = 0; 623 if (server->flags & NFS_MOUNT_SOFTERR) 624 server->client->cl_softerr = 1; 625 if (server->flags & NFS_MOUNT_SOFT) 626 server->client->cl_softrtry = 1; 627 628 return 0; 629 } 630 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 631 632 /** 633 * nfs_init_client - Initialise an NFS2 or NFS3 client 634 * 635 * @clp: nfs_client to initialise 636 * @cl_init: Initialisation parameters 637 * 638 * Returns pointer to an NFS client, or an ERR_PTR value. 639 */ 640 struct nfs_client *nfs_init_client(struct nfs_client *clp, 641 const struct nfs_client_initdata *cl_init) 642 { 643 int error; 644 645 /* the client is already initialised */ 646 if (clp->cl_cons_state == NFS_CS_READY) 647 return clp; 648 649 /* 650 * Create a client RPC handle for doing FSSTAT with UNIX auth only 651 * - RFC 2623, sec 2.3.2 652 */ 653 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 654 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 655 if (error < 0) { 656 nfs_put_client(clp); 657 clp = ERR_PTR(error); 658 } 659 return clp; 660 } 661 EXPORT_SYMBOL_GPL(nfs_init_client); 662 663 /* 664 * Create a version 2 or 3 client 665 */ 666 static int nfs_init_server(struct nfs_server *server, 667 const struct fs_context *fc) 668 { 669 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 670 struct rpc_timeout timeparms; 671 struct nfs_client_initdata cl_init = { 672 .hostname = ctx->nfs_server.hostname, 673 .addr = (const struct sockaddr *)&ctx->nfs_server.address, 674 .addrlen = ctx->nfs_server.addrlen, 675 .nfs_mod = ctx->nfs_mod, 676 .proto = ctx->nfs_server.protocol, 677 .net = fc->net_ns, 678 .timeparms = &timeparms, 679 .cred = server->cred, 680 .nconnect = ctx->nfs_server.nconnect, 681 .init_flags = (1UL << NFS_CS_REUSEPORT), 682 }; 683 struct nfs_client *clp; 684 int error; 685 686 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 687 ctx->timeo, ctx->retrans); 688 if (ctx->flags & NFS_MOUNT_NORESVPORT) 689 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 690 691 /* Allocate or find a client reference we can use */ 692 clp = nfs_get_client(&cl_init); 693 if (IS_ERR(clp)) 694 return PTR_ERR(clp); 695 696 server->nfs_client = clp; 697 698 /* Initialise the client representation from the mount data */ 699 server->flags = ctx->flags; 700 server->options = ctx->options; 701 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 702 703 switch (clp->rpc_ops->version) { 704 case 2: 705 server->fattr_valid = NFS_ATTR_FATTR_V2; 706 break; 707 case 3: 708 server->fattr_valid = NFS_ATTR_FATTR_V3; 709 break; 710 default: 711 server->fattr_valid = NFS_ATTR_FATTR_V4; 712 } 713 714 if (ctx->rsize) 715 server->rsize = nfs_block_size(ctx->rsize, NULL); 716 if (ctx->wsize) 717 server->wsize = nfs_block_size(ctx->wsize, NULL); 718 719 server->acregmin = ctx->acregmin * HZ; 720 server->acregmax = ctx->acregmax * HZ; 721 server->acdirmin = ctx->acdirmin * HZ; 722 server->acdirmax = ctx->acdirmax * HZ; 723 724 /* Start lockd here, before we might error out */ 725 error = nfs_start_lockd(server); 726 if (error < 0) 727 goto error; 728 729 server->port = ctx->nfs_server.port; 730 server->auth_info = ctx->auth_info; 731 732 error = nfs_init_server_rpcclient(server, &timeparms, 733 ctx->selected_flavor); 734 if (error < 0) 735 goto error; 736 737 /* Preserve the values of mount_server-related mount options */ 738 if (ctx->mount_server.addrlen) { 739 memcpy(&server->mountd_address, &ctx->mount_server.address, 740 ctx->mount_server.addrlen); 741 server->mountd_addrlen = ctx->mount_server.addrlen; 742 } 743 server->mountd_version = ctx->mount_server.version; 744 server->mountd_port = ctx->mount_server.port; 745 server->mountd_protocol = ctx->mount_server.protocol; 746 747 server->namelen = ctx->namlen; 748 return 0; 749 750 error: 751 server->nfs_client = NULL; 752 nfs_put_client(clp); 753 return error; 754 } 755 756 /* 757 * Load up the server record from information gained in an fsinfo record 758 */ 759 static void nfs_server_set_fsinfo(struct nfs_server *server, 760 struct nfs_fsinfo *fsinfo) 761 { 762 unsigned long max_rpc_payload, raw_max_rpc_payload; 763 764 /* Work out a lot of parameters */ 765 if (server->rsize == 0) 766 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 767 if (server->wsize == 0) 768 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 769 770 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 771 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 772 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 773 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 774 775 raw_max_rpc_payload = rpc_max_payload(server->client); 776 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 777 778 if (server->rsize > max_rpc_payload) 779 server->rsize = max_rpc_payload; 780 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 781 server->rsize = NFS_MAX_FILE_IO_SIZE; 782 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 783 784 if (server->wsize > max_rpc_payload) 785 server->wsize = max_rpc_payload; 786 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 787 server->wsize = NFS_MAX_FILE_IO_SIZE; 788 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 789 790 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 791 792 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 793 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 794 server->dtsize = NFS_MAX_FILE_IO_SIZE; 795 if (server->dtsize > server->rsize) 796 server->dtsize = server->rsize; 797 798 if (server->flags & NFS_MOUNT_NOAC) { 799 server->acregmin = server->acregmax = 0; 800 server->acdirmin = server->acdirmax = 0; 801 } 802 803 server->maxfilesize = fsinfo->maxfilesize; 804 805 server->time_delta = fsinfo->time_delta; 806 server->change_attr_type = fsinfo->change_attr_type; 807 808 server->clone_blksize = fsinfo->clone_blksize; 809 /* We're airborne Set socket buffersize */ 810 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 811 812 #ifdef CONFIG_NFS_V4_2 813 /* 814 * Defaults until limited by the session parameters. 815 */ 816 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 817 XATTR_SIZE_MAX); 818 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 819 XATTR_SIZE_MAX); 820 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 821 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 822 823 if (fsinfo->xattr_support) 824 server->caps |= NFS_CAP_XATTR; 825 #endif 826 } 827 828 /* 829 * Probe filesystem information, including the FSID on v2/v3 830 */ 831 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 832 { 833 struct nfs_fsinfo fsinfo; 834 struct nfs_client *clp = server->nfs_client; 835 int error; 836 837 if (clp->rpc_ops->set_capabilities != NULL) { 838 error = clp->rpc_ops->set_capabilities(server, mntfh); 839 if (error < 0) 840 return error; 841 } 842 843 fsinfo.fattr = fattr; 844 fsinfo.nlayouttypes = 0; 845 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 846 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 847 if (error < 0) 848 return error; 849 850 nfs_server_set_fsinfo(server, &fsinfo); 851 852 /* Get some general file system info */ 853 if (server->namelen == 0) { 854 struct nfs_pathconf pathinfo; 855 856 pathinfo.fattr = fattr; 857 nfs_fattr_init(fattr); 858 859 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 860 server->namelen = pathinfo.max_namelen; 861 } 862 863 return 0; 864 } 865 866 /* 867 * Grab the destination's particulars, including lease expiry time. 868 * 869 * Returns zero if probe succeeded and retrieved FSID matches the FSID 870 * we have cached. 871 */ 872 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 873 { 874 struct nfs_fattr *fattr; 875 int error; 876 877 fattr = nfs_alloc_fattr(); 878 if (fattr == NULL) 879 return -ENOMEM; 880 881 /* Sanity: the probe won't work if the destination server 882 * does not recognize the migrated FH. */ 883 error = nfs_probe_fsinfo(server, mntfh, fattr); 884 885 nfs_free_fattr(fattr); 886 return error; 887 } 888 EXPORT_SYMBOL_GPL(nfs_probe_server); 889 890 /* 891 * Copy useful information when duplicating a server record 892 */ 893 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 894 { 895 target->flags = source->flags; 896 target->rsize = source->rsize; 897 target->wsize = source->wsize; 898 target->acregmin = source->acregmin; 899 target->acregmax = source->acregmax; 900 target->acdirmin = source->acdirmin; 901 target->acdirmax = source->acdirmax; 902 target->caps = source->caps; 903 target->options = source->options; 904 target->auth_info = source->auth_info; 905 target->port = source->port; 906 } 907 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 908 909 void nfs_server_insert_lists(struct nfs_server *server) 910 { 911 struct nfs_client *clp = server->nfs_client; 912 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 913 914 spin_lock(&nn->nfs_client_lock); 915 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 916 list_add_tail(&server->master_link, &nn->nfs_volume_list); 917 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 918 spin_unlock(&nn->nfs_client_lock); 919 920 } 921 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 922 923 void nfs_server_remove_lists(struct nfs_server *server) 924 { 925 struct nfs_client *clp = server->nfs_client; 926 struct nfs_net *nn; 927 928 if (clp == NULL) 929 return; 930 nn = net_generic(clp->cl_net, nfs_net_id); 931 spin_lock(&nn->nfs_client_lock); 932 list_del_rcu(&server->client_link); 933 if (list_empty(&clp->cl_superblocks)) 934 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 935 list_del(&server->master_link); 936 spin_unlock(&nn->nfs_client_lock); 937 938 synchronize_rcu(); 939 } 940 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 941 942 /* 943 * Allocate and initialise a server record 944 */ 945 struct nfs_server *nfs_alloc_server(void) 946 { 947 struct nfs_server *server; 948 949 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 950 if (!server) 951 return NULL; 952 953 server->client = server->client_acl = ERR_PTR(-EINVAL); 954 955 /* Zero out the NFS state stuff */ 956 INIT_LIST_HEAD(&server->client_link); 957 INIT_LIST_HEAD(&server->master_link); 958 INIT_LIST_HEAD(&server->delegations); 959 INIT_LIST_HEAD(&server->layouts); 960 INIT_LIST_HEAD(&server->state_owners_lru); 961 INIT_LIST_HEAD(&server->ss_copies); 962 963 atomic_set(&server->active, 0); 964 965 server->io_stats = nfs_alloc_iostats(); 966 if (!server->io_stats) { 967 kfree(server); 968 return NULL; 969 } 970 971 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 972 973 ida_init(&server->openowner_id); 974 ida_init(&server->lockowner_id); 975 pnfs_init_server(server); 976 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 977 978 return server; 979 } 980 EXPORT_SYMBOL_GPL(nfs_alloc_server); 981 982 /* 983 * Free up a server record 984 */ 985 void nfs_free_server(struct nfs_server *server) 986 { 987 nfs_server_remove_lists(server); 988 989 if (server->destroy != NULL) 990 server->destroy(server); 991 992 if (!IS_ERR(server->client_acl)) 993 rpc_shutdown_client(server->client_acl); 994 if (!IS_ERR(server->client)) 995 rpc_shutdown_client(server->client); 996 997 nfs_put_client(server->nfs_client); 998 999 ida_destroy(&server->lockowner_id); 1000 ida_destroy(&server->openowner_id); 1001 nfs_free_iostats(server->io_stats); 1002 put_cred(server->cred); 1003 kfree(server); 1004 nfs_release_automount_timer(); 1005 } 1006 EXPORT_SYMBOL_GPL(nfs_free_server); 1007 1008 /* 1009 * Create a version 2 or 3 volume record 1010 * - keyed on server and FSID 1011 */ 1012 struct nfs_server *nfs_create_server(struct fs_context *fc) 1013 { 1014 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1015 struct nfs_server *server; 1016 struct nfs_fattr *fattr; 1017 int error; 1018 1019 server = nfs_alloc_server(); 1020 if (!server) 1021 return ERR_PTR(-ENOMEM); 1022 1023 server->cred = get_cred(fc->cred); 1024 1025 error = -ENOMEM; 1026 fattr = nfs_alloc_fattr(); 1027 if (fattr == NULL) 1028 goto error; 1029 1030 /* Get a client representation */ 1031 error = nfs_init_server(server, fc); 1032 if (error < 0) 1033 goto error; 1034 1035 /* Probe the root fh to retrieve its FSID */ 1036 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1037 if (error < 0) 1038 goto error; 1039 if (server->nfs_client->rpc_ops->version == 3) { 1040 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1041 server->namelen = NFS3_MAXNAMLEN; 1042 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1043 server->caps |= NFS_CAP_READDIRPLUS; 1044 } else { 1045 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1046 server->namelen = NFS2_MAXNAMLEN; 1047 } 1048 1049 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1050 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1051 fattr, NULL); 1052 if (error < 0) { 1053 dprintk("nfs_create_server: getattr error = %d\n", -error); 1054 goto error; 1055 } 1056 } 1057 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1058 1059 dprintk("Server FSID: %llx:%llx\n", 1060 (unsigned long long) server->fsid.major, 1061 (unsigned long long) server->fsid.minor); 1062 1063 nfs_server_insert_lists(server); 1064 server->mount_time = jiffies; 1065 nfs_free_fattr(fattr); 1066 return server; 1067 1068 error: 1069 nfs_free_fattr(fattr); 1070 nfs_free_server(server); 1071 return ERR_PTR(error); 1072 } 1073 EXPORT_SYMBOL_GPL(nfs_create_server); 1074 1075 /* 1076 * Clone an NFS2, NFS3 or NFS4 server record 1077 */ 1078 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1079 struct nfs_fh *fh, 1080 struct nfs_fattr *fattr, 1081 rpc_authflavor_t flavor) 1082 { 1083 struct nfs_server *server; 1084 int error; 1085 1086 server = nfs_alloc_server(); 1087 if (!server) 1088 return ERR_PTR(-ENOMEM); 1089 1090 server->cred = get_cred(source->cred); 1091 1092 /* Copy data from the source */ 1093 server->nfs_client = source->nfs_client; 1094 server->destroy = source->destroy; 1095 refcount_inc(&server->nfs_client->cl_count); 1096 nfs_server_copy_userdata(server, source); 1097 1098 server->fsid = fattr->fsid; 1099 1100 error = nfs_init_server_rpcclient(server, 1101 source->client->cl_timeout, 1102 flavor); 1103 if (error < 0) 1104 goto out_free_server; 1105 1106 /* probe the filesystem info for this server filesystem */ 1107 error = nfs_probe_server(server, fh); 1108 if (error < 0) 1109 goto out_free_server; 1110 1111 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1112 server->namelen = NFS4_MAXNAMLEN; 1113 1114 error = nfs_start_lockd(server); 1115 if (error < 0) 1116 goto out_free_server; 1117 1118 nfs_server_insert_lists(server); 1119 server->mount_time = jiffies; 1120 1121 return server; 1122 1123 out_free_server: 1124 nfs_free_server(server); 1125 return ERR_PTR(error); 1126 } 1127 EXPORT_SYMBOL_GPL(nfs_clone_server); 1128 1129 void nfs_clients_init(struct net *net) 1130 { 1131 struct nfs_net *nn = net_generic(net, nfs_net_id); 1132 1133 INIT_LIST_HEAD(&nn->nfs_client_list); 1134 INIT_LIST_HEAD(&nn->nfs_volume_list); 1135 #if IS_ENABLED(CONFIG_NFS_V4) 1136 idr_init(&nn->cb_ident_idr); 1137 #endif 1138 spin_lock_init(&nn->nfs_client_lock); 1139 nn->boot_time = ktime_get_real(); 1140 1141 nfs_netns_sysfs_setup(nn, net); 1142 } 1143 1144 void nfs_clients_exit(struct net *net) 1145 { 1146 struct nfs_net *nn = net_generic(net, nfs_net_id); 1147 1148 nfs_netns_sysfs_destroy(nn); 1149 nfs_cleanup_cb_ident_idr(net); 1150 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1151 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1152 } 1153 1154 #ifdef CONFIG_PROC_FS 1155 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1156 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1157 static void nfs_server_list_stop(struct seq_file *p, void *v); 1158 static int nfs_server_list_show(struct seq_file *m, void *v); 1159 1160 static const struct seq_operations nfs_server_list_ops = { 1161 .start = nfs_server_list_start, 1162 .next = nfs_server_list_next, 1163 .stop = nfs_server_list_stop, 1164 .show = nfs_server_list_show, 1165 }; 1166 1167 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1168 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1169 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1170 static int nfs_volume_list_show(struct seq_file *m, void *v); 1171 1172 static const struct seq_operations nfs_volume_list_ops = { 1173 .start = nfs_volume_list_start, 1174 .next = nfs_volume_list_next, 1175 .stop = nfs_volume_list_stop, 1176 .show = nfs_volume_list_show, 1177 }; 1178 1179 /* 1180 * set up the iterator to start reading from the server list and return the first item 1181 */ 1182 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1183 __acquires(&nn->nfs_client_lock) 1184 { 1185 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1186 1187 /* lock the list against modification */ 1188 spin_lock(&nn->nfs_client_lock); 1189 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1190 } 1191 1192 /* 1193 * move to next server 1194 */ 1195 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1196 { 1197 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1198 1199 return seq_list_next(v, &nn->nfs_client_list, pos); 1200 } 1201 1202 /* 1203 * clean up after reading from the transports list 1204 */ 1205 static void nfs_server_list_stop(struct seq_file *p, void *v) 1206 __releases(&nn->nfs_client_lock) 1207 { 1208 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1209 1210 spin_unlock(&nn->nfs_client_lock); 1211 } 1212 1213 /* 1214 * display a header line followed by a load of call lines 1215 */ 1216 static int nfs_server_list_show(struct seq_file *m, void *v) 1217 { 1218 struct nfs_client *clp; 1219 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1220 1221 /* display header on line 1 */ 1222 if (v == &nn->nfs_client_list) { 1223 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1224 return 0; 1225 } 1226 1227 /* display one transport per line on subsequent lines */ 1228 clp = list_entry(v, struct nfs_client, cl_share_link); 1229 1230 /* Check if the client is initialized */ 1231 if (clp->cl_cons_state != NFS_CS_READY) 1232 return 0; 1233 1234 rcu_read_lock(); 1235 seq_printf(m, "v%u %s %s %3d %s\n", 1236 clp->rpc_ops->version, 1237 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1238 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1239 refcount_read(&clp->cl_count), 1240 clp->cl_hostname); 1241 rcu_read_unlock(); 1242 1243 return 0; 1244 } 1245 1246 /* 1247 * set up the iterator to start reading from the volume list and return the first item 1248 */ 1249 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1250 __acquires(&nn->nfs_client_lock) 1251 { 1252 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1253 1254 /* lock the list against modification */ 1255 spin_lock(&nn->nfs_client_lock); 1256 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1257 } 1258 1259 /* 1260 * move to next volume 1261 */ 1262 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1263 { 1264 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1265 1266 return seq_list_next(v, &nn->nfs_volume_list, pos); 1267 } 1268 1269 /* 1270 * clean up after reading from the transports list 1271 */ 1272 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1273 __releases(&nn->nfs_client_lock) 1274 { 1275 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1276 1277 spin_unlock(&nn->nfs_client_lock); 1278 } 1279 1280 /* 1281 * display a header line followed by a load of call lines 1282 */ 1283 static int nfs_volume_list_show(struct seq_file *m, void *v) 1284 { 1285 struct nfs_server *server; 1286 struct nfs_client *clp; 1287 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1288 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1289 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1290 1291 /* display header on line 1 */ 1292 if (v == &nn->nfs_volume_list) { 1293 seq_puts(m, "NV SERVER PORT DEV FSID" 1294 " FSC\n"); 1295 return 0; 1296 } 1297 /* display one transport per line on subsequent lines */ 1298 server = list_entry(v, struct nfs_server, master_link); 1299 clp = server->nfs_client; 1300 1301 snprintf(dev, sizeof(dev), "%u:%u", 1302 MAJOR(server->s_dev), MINOR(server->s_dev)); 1303 1304 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1305 (unsigned long long) server->fsid.major, 1306 (unsigned long long) server->fsid.minor); 1307 1308 rcu_read_lock(); 1309 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1310 clp->rpc_ops->version, 1311 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1312 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1313 dev, 1314 fsid, 1315 nfs_server_fscache_state(server)); 1316 rcu_read_unlock(); 1317 1318 return 0; 1319 } 1320 1321 int nfs_fs_proc_net_init(struct net *net) 1322 { 1323 struct nfs_net *nn = net_generic(net, nfs_net_id); 1324 struct proc_dir_entry *p; 1325 1326 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1327 if (!nn->proc_nfsfs) 1328 goto error_0; 1329 1330 /* a file of servers with which we're dealing */ 1331 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1332 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1333 if (!p) 1334 goto error_1; 1335 1336 /* a file of volumes that we have mounted */ 1337 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1338 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1339 if (!p) 1340 goto error_1; 1341 return 0; 1342 1343 error_1: 1344 remove_proc_subtree("nfsfs", net->proc_net); 1345 error_0: 1346 return -ENOMEM; 1347 } 1348 1349 void nfs_fs_proc_net_exit(struct net *net) 1350 { 1351 remove_proc_subtree("nfsfs", net->proc_net); 1352 } 1353 1354 /* 1355 * initialise the /proc/fs/nfsfs/ directory 1356 */ 1357 int __init nfs_fs_proc_init(void) 1358 { 1359 if (!proc_mkdir("fs/nfsfs", NULL)) 1360 goto error_0; 1361 1362 /* a file of servers with which we're dealing */ 1363 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1364 goto error_1; 1365 1366 /* a file of volumes that we have mounted */ 1367 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1368 goto error_1; 1369 1370 return 0; 1371 error_1: 1372 remove_proc_subtree("fs/nfsfs", NULL); 1373 error_0: 1374 return -ENOMEM; 1375 } 1376 1377 /* 1378 * clean up the /proc/fs/nfsfs/ directory 1379 */ 1380 void nfs_fs_proc_exit(void) 1381 { 1382 remove_proc_subtree("fs/nfsfs", NULL); 1383 } 1384 1385 #endif /* CONFIG_PROC_FS */ 1386