1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/addr.h> 24 #include <linux/sunrpc/clnt.h> 25 #include <linux/sunrpc/stats.h> 26 #include <linux/sunrpc/metrics.h> 27 #include <linux/sunrpc/xprtsock.h> 28 #include <linux/sunrpc/xprtrdma.h> 29 #include <linux/nfs_fs.h> 30 #include <linux/nfs_mount.h> 31 #include <linux/nfs4_mount.h> 32 #include <linux/lockd/bind.h> 33 #include <linux/seq_file.h> 34 #include <linux/mount.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <linux/idr.h> 40 #include <net/ipv6.h> 41 #include <linux/nfs_xdr.h> 42 #include <linux/sunrpc/bc_xprt.h> 43 #include <linux/nsproxy.h> 44 #include <linux/pid_namespace.h> 45 46 47 #include "nfs4_fs.h" 48 #include "callback.h" 49 #include "delegation.h" 50 #include "iostat.h" 51 #include "internal.h" 52 #include "fscache.h" 53 #include "pnfs.h" 54 #include "nfs.h" 55 #include "netns.h" 56 57 #define NFSDBG_FACILITY NFSDBG_CLIENT 58 59 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 60 static DEFINE_SPINLOCK(nfs_version_lock); 61 static DEFINE_MUTEX(nfs_version_mutex); 62 static LIST_HEAD(nfs_versions); 63 64 /* 65 * RPC cruft for NFS 66 */ 67 static const struct rpc_version *nfs_version[5] = { 68 [2] = NULL, 69 [3] = NULL, 70 [4] = NULL, 71 }; 72 73 const struct rpc_program nfs_program = { 74 .name = "nfs", 75 .number = NFS_PROGRAM, 76 .nrvers = ARRAY_SIZE(nfs_version), 77 .version = nfs_version, 78 .stats = &nfs_rpcstat, 79 .pipe_dir_name = NFS_PIPE_DIRNAME, 80 }; 81 82 struct rpc_stat nfs_rpcstat = { 83 .program = &nfs_program 84 }; 85 86 static struct nfs_subversion *find_nfs_version(unsigned int version) 87 { 88 struct nfs_subversion *nfs; 89 spin_lock(&nfs_version_lock); 90 91 list_for_each_entry(nfs, &nfs_versions, list) { 92 if (nfs->rpc_ops->version == version) { 93 spin_unlock(&nfs_version_lock); 94 return nfs; 95 } 96 } 97 98 spin_unlock(&nfs_version_lock); 99 return ERR_PTR(-EPROTONOSUPPORT); 100 } 101 102 struct nfs_subversion *get_nfs_version(unsigned int version) 103 { 104 struct nfs_subversion *nfs = find_nfs_version(version); 105 106 if (IS_ERR(nfs)) { 107 mutex_lock(&nfs_version_mutex); 108 request_module("nfsv%d", version); 109 nfs = find_nfs_version(version); 110 mutex_unlock(&nfs_version_mutex); 111 } 112 113 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 114 return ERR_PTR(-EAGAIN); 115 return nfs; 116 } 117 118 void put_nfs_version(struct nfs_subversion *nfs) 119 { 120 module_put(nfs->owner); 121 } 122 123 void register_nfs_version(struct nfs_subversion *nfs) 124 { 125 spin_lock(&nfs_version_lock); 126 127 list_add(&nfs->list, &nfs_versions); 128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 129 130 spin_unlock(&nfs_version_lock); 131 } 132 EXPORT_SYMBOL_GPL(register_nfs_version); 133 134 void unregister_nfs_version(struct nfs_subversion *nfs) 135 { 136 spin_lock(&nfs_version_lock); 137 138 nfs_version[nfs->rpc_ops->version] = NULL; 139 list_del(&nfs->list); 140 141 spin_unlock(&nfs_version_lock); 142 } 143 EXPORT_SYMBOL_GPL(unregister_nfs_version); 144 145 /* 146 * Allocate a shared client record 147 * 148 * Since these are allocated/deallocated very rarely, we don't 149 * bother putting them in a slab cache... 150 */ 151 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 152 { 153 struct nfs_client *clp; 154 struct rpc_cred *cred; 155 int err = -ENOMEM; 156 157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 158 goto error_0; 159 160 clp->cl_nfs_mod = cl_init->nfs_mod; 161 if (!try_module_get(clp->cl_nfs_mod->owner)) 162 goto error_dealloc; 163 164 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 165 166 atomic_set(&clp->cl_count, 1); 167 clp->cl_cons_state = NFS_CS_INITING; 168 169 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 170 clp->cl_addrlen = cl_init->addrlen; 171 172 if (cl_init->hostname) { 173 err = -ENOMEM; 174 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 175 if (!clp->cl_hostname) 176 goto error_cleanup; 177 } 178 179 INIT_LIST_HEAD(&clp->cl_superblocks); 180 clp->cl_rpcclient = ERR_PTR(-EINVAL); 181 182 clp->cl_proto = cl_init->proto; 183 clp->cl_net = get_net(cl_init->net); 184 185 cred = rpc_lookup_machine_cred("*"); 186 if (!IS_ERR(cred)) 187 clp->cl_machine_cred = cred; 188 nfs_fscache_get_client_cookie(clp); 189 190 return clp; 191 192 error_cleanup: 193 put_nfs_version(clp->cl_nfs_mod); 194 error_dealloc: 195 kfree(clp); 196 error_0: 197 return ERR_PTR(err); 198 } 199 EXPORT_SYMBOL_GPL(nfs_alloc_client); 200 201 #if IS_ENABLED(CONFIG_NFS_V4) 202 void nfs_cleanup_cb_ident_idr(struct net *net) 203 { 204 struct nfs_net *nn = net_generic(net, nfs_net_id); 205 206 idr_destroy(&nn->cb_ident_idr); 207 } 208 209 /* nfs_client_lock held */ 210 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 211 { 212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 213 214 if (clp->cl_cb_ident) 215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 216 } 217 218 static void pnfs_init_server(struct nfs_server *server) 219 { 220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 221 } 222 223 #else 224 void nfs_cleanup_cb_ident_idr(struct net *net) 225 { 226 } 227 228 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 229 { 230 } 231 232 static void pnfs_init_server(struct nfs_server *server) 233 { 234 } 235 236 #endif /* CONFIG_NFS_V4 */ 237 238 /* 239 * Destroy a shared client record 240 */ 241 void nfs_free_client(struct nfs_client *clp) 242 { 243 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 244 245 nfs_fscache_release_client_cookie(clp); 246 247 /* -EIO all pending I/O */ 248 if (!IS_ERR(clp->cl_rpcclient)) 249 rpc_shutdown_client(clp->cl_rpcclient); 250 251 if (clp->cl_machine_cred != NULL) 252 put_rpccred(clp->cl_machine_cred); 253 254 put_net(clp->cl_net); 255 put_nfs_version(clp->cl_nfs_mod); 256 kfree(clp->cl_hostname); 257 kfree(clp->cl_acceptor); 258 kfree(clp); 259 260 dprintk("<-- nfs_free_client()\n"); 261 } 262 EXPORT_SYMBOL_GPL(nfs_free_client); 263 264 /* 265 * Release a reference to a shared client record 266 */ 267 void nfs_put_client(struct nfs_client *clp) 268 { 269 struct nfs_net *nn; 270 271 if (!clp) 272 return; 273 274 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 275 nn = net_generic(clp->cl_net, nfs_net_id); 276 277 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 278 list_del(&clp->cl_share_link); 279 nfs_cb_idr_remove_locked(clp); 280 spin_unlock(&nn->nfs_client_lock); 281 282 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 283 284 clp->rpc_ops->free_client(clp); 285 } 286 } 287 EXPORT_SYMBOL_GPL(nfs_put_client); 288 289 /* 290 * Find an nfs_client on the list that matches the initialisation data 291 * that is supplied. 292 */ 293 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 294 { 295 struct nfs_client *clp; 296 const struct sockaddr *sap = data->addr; 297 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 298 299 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 300 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 301 /* Don't match clients that failed to initialise properly */ 302 if (clp->cl_cons_state < 0) 303 continue; 304 305 /* Different NFS versions cannot share the same nfs_client */ 306 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 307 continue; 308 309 if (clp->cl_proto != data->proto) 310 continue; 311 /* Match nfsv4 minorversion */ 312 if (clp->cl_minorversion != data->minorversion) 313 continue; 314 /* Match the full socket address */ 315 if (!rpc_cmp_addr_port(sap, clap)) 316 /* Match all xprt_switch full socket addresses */ 317 if (IS_ERR(clp->cl_rpcclient) || 318 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 319 sap)) 320 continue; 321 322 atomic_inc(&clp->cl_count); 323 return clp; 324 } 325 return NULL; 326 } 327 328 /* 329 * Return true if @clp is done initializing, false if still working on it. 330 * 331 * Use nfs_client_init_status to check if it was successful. 332 */ 333 bool nfs_client_init_is_complete(const struct nfs_client *clp) 334 { 335 return clp->cl_cons_state <= NFS_CS_READY; 336 } 337 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 338 339 /* 340 * Return 0 if @clp was successfully initialized, -errno otherwise. 341 * 342 * This must be called *after* nfs_client_init_is_complete() returns true, 343 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 344 */ 345 int nfs_client_init_status(const struct nfs_client *clp) 346 { 347 /* called without checking nfs_client_init_is_complete */ 348 if (clp->cl_cons_state > NFS_CS_READY) { 349 WARN_ON_ONCE(1); 350 return -EINVAL; 351 } 352 return clp->cl_cons_state; 353 } 354 EXPORT_SYMBOL_GPL(nfs_client_init_status); 355 356 int nfs_wait_client_init_complete(const struct nfs_client *clp) 357 { 358 return wait_event_killable(nfs_client_active_wq, 359 nfs_client_init_is_complete(clp)); 360 } 361 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 362 363 /* 364 * Found an existing client. Make sure it's ready before returning. 365 */ 366 static struct nfs_client * 367 nfs_found_client(const struct nfs_client_initdata *cl_init, 368 struct nfs_client *clp) 369 { 370 int error; 371 372 error = nfs_wait_client_init_complete(clp); 373 if (error < 0) { 374 nfs_put_client(clp); 375 return ERR_PTR(-ERESTARTSYS); 376 } 377 378 if (clp->cl_cons_state < NFS_CS_READY) { 379 error = clp->cl_cons_state; 380 nfs_put_client(clp); 381 return ERR_PTR(error); 382 } 383 384 smp_rmb(); 385 386 dprintk("<-- %s found nfs_client %p for %s\n", 387 __func__, clp, cl_init->hostname ?: ""); 388 return clp; 389 } 390 391 /* 392 * Look up a client by IP address and protocol version 393 * - creates a new record if one doesn't yet exist 394 */ 395 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 396 { 397 struct nfs_client *clp, *new = NULL; 398 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 399 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 400 401 if (cl_init->hostname == NULL) { 402 WARN_ON(1); 403 return NULL; 404 } 405 406 dprintk("--> nfs_get_client(%s,v%u)\n", 407 cl_init->hostname, rpc_ops->version); 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 return nfs_found_client(cl_init, clp); 419 } 420 if (new) { 421 list_add_tail(&new->cl_share_link, 422 &nn->nfs_client_list); 423 spin_unlock(&nn->nfs_client_lock); 424 new->cl_flags = cl_init->init_flags; 425 return rpc_ops->init_client(new, cl_init); 426 } 427 428 spin_unlock(&nn->nfs_client_lock); 429 430 new = rpc_ops->alloc_client(cl_init); 431 } while (!IS_ERR(new)); 432 433 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 434 cl_init->hostname, PTR_ERR(new)); 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_retries == 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 .address = (struct sockaddr *)&clp->cl_addr, 504 .addrsize = clp->cl_addrlen, 505 .timeout = cl_init->timeparms, 506 .servername = clp->cl_hostname, 507 .nodename = cl_init->nodename, 508 .program = &nfs_program, 509 .version = clp->rpc_ops->version, 510 .authflavor = flavor, 511 }; 512 513 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 514 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 515 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 516 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 517 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 518 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 519 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 520 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 521 522 if (!IS_ERR(clp->cl_rpcclient)) 523 return 0; 524 525 clnt = rpc_create(&args); 526 if (IS_ERR(clnt)) { 527 dprintk("%s: cannot create RPC client. Error = %ld\n", 528 __func__, PTR_ERR(clnt)); 529 return PTR_ERR(clnt); 530 } 531 532 clp->cl_rpcclient = clnt; 533 return 0; 534 } 535 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 536 537 /* 538 * Version 2 or 3 client destruction 539 */ 540 static void nfs_destroy_server(struct nfs_server *server) 541 { 542 if (server->nlm_host) 543 nlmclnt_done(server->nlm_host); 544 } 545 546 /* 547 * Version 2 or 3 lockd setup 548 */ 549 static int nfs_start_lockd(struct nfs_server *server) 550 { 551 struct nlm_host *host; 552 struct nfs_client *clp = server->nfs_client; 553 struct nlmclnt_initdata nlm_init = { 554 .hostname = clp->cl_hostname, 555 .address = (struct sockaddr *)&clp->cl_addr, 556 .addrlen = clp->cl_addrlen, 557 .nfs_version = clp->rpc_ops->version, 558 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 559 1 : 0, 560 .net = clp->cl_net, 561 }; 562 563 if (nlm_init.nfs_version > 3) 564 return 0; 565 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 566 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 567 return 0; 568 569 switch (clp->cl_proto) { 570 default: 571 nlm_init.protocol = IPPROTO_TCP; 572 break; 573 case XPRT_TRANSPORT_UDP: 574 nlm_init.protocol = IPPROTO_UDP; 575 } 576 577 host = nlmclnt_init(&nlm_init); 578 if (IS_ERR(host)) 579 return PTR_ERR(host); 580 581 server->nlm_host = host; 582 server->destroy = nfs_destroy_server; 583 return 0; 584 } 585 586 /* 587 * Create a general RPC client 588 */ 589 int nfs_init_server_rpcclient(struct nfs_server *server, 590 const struct rpc_timeout *timeo, 591 rpc_authflavor_t pseudoflavour) 592 { 593 struct nfs_client *clp = server->nfs_client; 594 595 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 596 pseudoflavour); 597 if (IS_ERR(server->client)) { 598 dprintk("%s: couldn't create rpc_client!\n", __func__); 599 return PTR_ERR(server->client); 600 } 601 602 memcpy(&server->client->cl_timeout_default, 603 timeo, 604 sizeof(server->client->cl_timeout_default)); 605 server->client->cl_timeout = &server->client->cl_timeout_default; 606 server->client->cl_softrtry = 0; 607 if (server->flags & NFS_MOUNT_SOFT) 608 server->client->cl_softrtry = 1; 609 610 return 0; 611 } 612 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 613 614 /** 615 * nfs_init_client - Initialise an NFS2 or NFS3 client 616 * 617 * @clp: nfs_client to initialise 618 * @cl_init: Initialisation parameters 619 * 620 * Returns pointer to an NFS client, or an ERR_PTR value. 621 */ 622 struct nfs_client *nfs_init_client(struct nfs_client *clp, 623 const struct nfs_client_initdata *cl_init) 624 { 625 int error; 626 627 if (clp->cl_cons_state == NFS_CS_READY) { 628 /* the client is already initialised */ 629 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 630 return clp; 631 } 632 633 /* 634 * Create a client RPC handle for doing FSSTAT with UNIX auth only 635 * - RFC 2623, sec 2.3.2 636 */ 637 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 638 if (error < 0) 639 goto error; 640 nfs_mark_client_ready(clp, NFS_CS_READY); 641 return clp; 642 643 error: 644 nfs_mark_client_ready(clp, error); 645 nfs_put_client(clp); 646 dprintk("<-- nfs_init_client() = xerror %d\n", error); 647 return ERR_PTR(error); 648 } 649 EXPORT_SYMBOL_GPL(nfs_init_client); 650 651 /* 652 * Create a version 2 or 3 client 653 */ 654 static int nfs_init_server(struct nfs_server *server, 655 const struct nfs_parsed_mount_data *data, 656 struct nfs_subversion *nfs_mod) 657 { 658 struct rpc_timeout timeparms; 659 struct nfs_client_initdata cl_init = { 660 .hostname = data->nfs_server.hostname, 661 .addr = (const struct sockaddr *)&data->nfs_server.address, 662 .addrlen = data->nfs_server.addrlen, 663 .nfs_mod = nfs_mod, 664 .proto = data->nfs_server.protocol, 665 .net = data->net, 666 .timeparms = &timeparms, 667 }; 668 struct nfs_client *clp; 669 int error; 670 671 dprintk("--> nfs_init_server()\n"); 672 673 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 674 data->timeo, data->retrans); 675 if (data->flags & NFS_MOUNT_NORESVPORT) 676 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 677 678 /* Allocate or find a client reference we can use */ 679 clp = nfs_get_client(&cl_init); 680 if (IS_ERR(clp)) { 681 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 682 return PTR_ERR(clp); 683 } 684 685 server->nfs_client = clp; 686 687 /* Initialise the client representation from the mount data */ 688 server->flags = data->flags; 689 server->options = data->options; 690 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 691 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 692 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 693 694 if (data->rsize) 695 server->rsize = nfs_block_size(data->rsize, NULL); 696 if (data->wsize) 697 server->wsize = nfs_block_size(data->wsize, NULL); 698 699 server->acregmin = data->acregmin * HZ; 700 server->acregmax = data->acregmax * HZ; 701 server->acdirmin = data->acdirmin * HZ; 702 server->acdirmax = data->acdirmax * HZ; 703 704 /* Start lockd here, before we might error out */ 705 error = nfs_start_lockd(server); 706 if (error < 0) 707 goto error; 708 709 server->port = data->nfs_server.port; 710 server->auth_info = data->auth_info; 711 712 error = nfs_init_server_rpcclient(server, &timeparms, 713 data->selected_flavor); 714 if (error < 0) 715 goto error; 716 717 /* Preserve the values of mount_server-related mount options */ 718 if (data->mount_server.addrlen) { 719 memcpy(&server->mountd_address, &data->mount_server.address, 720 data->mount_server.addrlen); 721 server->mountd_addrlen = data->mount_server.addrlen; 722 } 723 server->mountd_version = data->mount_server.version; 724 server->mountd_port = data->mount_server.port; 725 server->mountd_protocol = data->mount_server.protocol; 726 727 server->namelen = data->namlen; 728 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 729 return 0; 730 731 error: 732 server->nfs_client = NULL; 733 nfs_put_client(clp); 734 dprintk("<-- nfs_init_server() = xerror %d\n", error); 735 return error; 736 } 737 738 /* 739 * Load up the server record from information gained in an fsinfo record 740 */ 741 static void nfs_server_set_fsinfo(struct nfs_server *server, 742 struct nfs_fsinfo *fsinfo) 743 { 744 unsigned long max_rpc_payload; 745 746 /* Work out a lot of parameters */ 747 if (server->rsize == 0) 748 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 749 if (server->wsize == 0) 750 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 751 752 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 753 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 754 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 755 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 756 757 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 758 if (server->rsize > max_rpc_payload) 759 server->rsize = max_rpc_payload; 760 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 761 server->rsize = NFS_MAX_FILE_IO_SIZE; 762 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 763 764 server->backing_dev_info.name = "nfs"; 765 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 766 767 if (server->wsize > max_rpc_payload) 768 server->wsize = max_rpc_payload; 769 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 770 server->wsize = NFS_MAX_FILE_IO_SIZE; 771 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 772 773 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 774 775 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 776 if (server->dtsize > PAGE_SIZE * NFS_MAX_READDIR_PAGES) 777 server->dtsize = PAGE_SIZE * NFS_MAX_READDIR_PAGES; 778 if (server->dtsize > server->rsize) 779 server->dtsize = server->rsize; 780 781 if (server->flags & NFS_MOUNT_NOAC) { 782 server->acregmin = server->acregmax = 0; 783 server->acdirmin = server->acdirmax = 0; 784 } 785 786 server->maxfilesize = fsinfo->maxfilesize; 787 788 server->time_delta = fsinfo->time_delta; 789 790 server->clone_blksize = fsinfo->clone_blksize; 791 /* We're airborne Set socket buffersize */ 792 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 793 } 794 795 /* 796 * Probe filesystem information, including the FSID on v2/v3 797 */ 798 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 799 { 800 struct nfs_fsinfo fsinfo; 801 struct nfs_client *clp = server->nfs_client; 802 int error; 803 804 dprintk("--> nfs_probe_fsinfo()\n"); 805 806 if (clp->rpc_ops->set_capabilities != NULL) { 807 error = clp->rpc_ops->set_capabilities(server, mntfh); 808 if (error < 0) 809 goto out_error; 810 } 811 812 fsinfo.fattr = fattr; 813 fsinfo.nlayouttypes = 0; 814 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 815 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 816 if (error < 0) 817 goto out_error; 818 819 nfs_server_set_fsinfo(server, &fsinfo); 820 821 /* Get some general file system info */ 822 if (server->namelen == 0) { 823 struct nfs_pathconf pathinfo; 824 825 pathinfo.fattr = fattr; 826 nfs_fattr_init(fattr); 827 828 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 829 server->namelen = pathinfo.max_namelen; 830 } 831 832 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 833 return 0; 834 835 out_error: 836 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 837 return error; 838 } 839 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 840 841 /* 842 * Copy useful information when duplicating a server record 843 */ 844 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 845 { 846 target->flags = source->flags; 847 target->rsize = source->rsize; 848 target->wsize = source->wsize; 849 target->acregmin = source->acregmin; 850 target->acregmax = source->acregmax; 851 target->acdirmin = source->acdirmin; 852 target->acdirmax = source->acdirmax; 853 target->caps = source->caps; 854 target->options = source->options; 855 target->auth_info = source->auth_info; 856 } 857 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 858 859 void nfs_server_insert_lists(struct nfs_server *server) 860 { 861 struct nfs_client *clp = server->nfs_client; 862 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 863 864 spin_lock(&nn->nfs_client_lock); 865 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 866 list_add_tail(&server->master_link, &nn->nfs_volume_list); 867 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 868 spin_unlock(&nn->nfs_client_lock); 869 870 } 871 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 872 873 void nfs_server_remove_lists(struct nfs_server *server) 874 { 875 struct nfs_client *clp = server->nfs_client; 876 struct nfs_net *nn; 877 878 if (clp == NULL) 879 return; 880 nn = net_generic(clp->cl_net, nfs_net_id); 881 spin_lock(&nn->nfs_client_lock); 882 list_del_rcu(&server->client_link); 883 if (list_empty(&clp->cl_superblocks)) 884 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 885 list_del(&server->master_link); 886 spin_unlock(&nn->nfs_client_lock); 887 888 synchronize_rcu(); 889 } 890 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 891 892 /* 893 * Allocate and initialise a server record 894 */ 895 struct nfs_server *nfs_alloc_server(void) 896 { 897 struct nfs_server *server; 898 899 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 900 if (!server) 901 return NULL; 902 903 server->client = server->client_acl = ERR_PTR(-EINVAL); 904 905 /* Zero out the NFS state stuff */ 906 INIT_LIST_HEAD(&server->client_link); 907 INIT_LIST_HEAD(&server->master_link); 908 INIT_LIST_HEAD(&server->delegations); 909 INIT_LIST_HEAD(&server->layouts); 910 INIT_LIST_HEAD(&server->state_owners_lru); 911 912 atomic_set(&server->active, 0); 913 914 server->io_stats = nfs_alloc_iostats(); 915 if (!server->io_stats) { 916 kfree(server); 917 return NULL; 918 } 919 920 if (bdi_init(&server->backing_dev_info)) { 921 nfs_free_iostats(server->io_stats); 922 kfree(server); 923 return NULL; 924 } 925 926 ida_init(&server->openowner_id); 927 ida_init(&server->lockowner_id); 928 pnfs_init_server(server); 929 930 return server; 931 } 932 EXPORT_SYMBOL_GPL(nfs_alloc_server); 933 934 /* 935 * Free up a server record 936 */ 937 void nfs_free_server(struct nfs_server *server) 938 { 939 dprintk("--> nfs_free_server()\n"); 940 941 nfs_server_remove_lists(server); 942 943 if (server->destroy != NULL) 944 server->destroy(server); 945 946 if (!IS_ERR(server->client_acl)) 947 rpc_shutdown_client(server->client_acl); 948 if (!IS_ERR(server->client)) 949 rpc_shutdown_client(server->client); 950 951 nfs_put_client(server->nfs_client); 952 953 ida_destroy(&server->lockowner_id); 954 ida_destroy(&server->openowner_id); 955 nfs_free_iostats(server->io_stats); 956 bdi_destroy(&server->backing_dev_info); 957 kfree(server); 958 nfs_release_automount_timer(); 959 dprintk("<-- nfs_free_server()\n"); 960 } 961 EXPORT_SYMBOL_GPL(nfs_free_server); 962 963 /* 964 * Create a version 2 or 3 volume record 965 * - keyed on server and FSID 966 */ 967 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 968 struct nfs_subversion *nfs_mod) 969 { 970 struct nfs_server *server; 971 struct nfs_fattr *fattr; 972 int error; 973 974 server = nfs_alloc_server(); 975 if (!server) 976 return ERR_PTR(-ENOMEM); 977 978 error = -ENOMEM; 979 fattr = nfs_alloc_fattr(); 980 if (fattr == NULL) 981 goto error; 982 983 /* Get a client representation */ 984 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 985 if (error < 0) 986 goto error; 987 988 /* Probe the root fh to retrieve its FSID */ 989 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 990 if (error < 0) 991 goto error; 992 if (server->nfs_client->rpc_ops->version == 3) { 993 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 994 server->namelen = NFS3_MAXNAMLEN; 995 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 996 server->caps |= NFS_CAP_READDIRPLUS; 997 } else { 998 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 999 server->namelen = NFS2_MAXNAMLEN; 1000 } 1001 1002 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1003 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 1004 if (error < 0) { 1005 dprintk("nfs_create_server: getattr error = %d\n", -error); 1006 goto error; 1007 } 1008 } 1009 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1010 1011 dprintk("Server FSID: %llx:%llx\n", 1012 (unsigned long long) server->fsid.major, 1013 (unsigned long long) server->fsid.minor); 1014 1015 nfs_server_insert_lists(server); 1016 server->mount_time = jiffies; 1017 nfs_free_fattr(fattr); 1018 return server; 1019 1020 error: 1021 nfs_free_fattr(fattr); 1022 nfs_free_server(server); 1023 return ERR_PTR(error); 1024 } 1025 EXPORT_SYMBOL_GPL(nfs_create_server); 1026 1027 /* 1028 * Clone an NFS2, NFS3 or NFS4 server record 1029 */ 1030 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1031 struct nfs_fh *fh, 1032 struct nfs_fattr *fattr, 1033 rpc_authflavor_t flavor) 1034 { 1035 struct nfs_server *server; 1036 struct nfs_fattr *fattr_fsinfo; 1037 int error; 1038 1039 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1040 (unsigned long long) fattr->fsid.major, 1041 (unsigned long long) fattr->fsid.minor); 1042 1043 server = nfs_alloc_server(); 1044 if (!server) 1045 return ERR_PTR(-ENOMEM); 1046 1047 error = -ENOMEM; 1048 fattr_fsinfo = nfs_alloc_fattr(); 1049 if (fattr_fsinfo == NULL) 1050 goto out_free_server; 1051 1052 /* Copy data from the source */ 1053 server->nfs_client = source->nfs_client; 1054 server->destroy = source->destroy; 1055 atomic_inc(&server->nfs_client->cl_count); 1056 nfs_server_copy_userdata(server, source); 1057 1058 server->fsid = fattr->fsid; 1059 1060 error = nfs_init_server_rpcclient(server, 1061 source->client->cl_timeout, 1062 flavor); 1063 if (error < 0) 1064 goto out_free_server; 1065 1066 /* probe the filesystem info for this server filesystem */ 1067 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1068 if (error < 0) 1069 goto out_free_server; 1070 1071 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1072 server->namelen = NFS4_MAXNAMLEN; 1073 1074 dprintk("Cloned FSID: %llx:%llx\n", 1075 (unsigned long long) server->fsid.major, 1076 (unsigned long long) server->fsid.minor); 1077 1078 error = nfs_start_lockd(server); 1079 if (error < 0) 1080 goto out_free_server; 1081 1082 nfs_server_insert_lists(server); 1083 server->mount_time = jiffies; 1084 1085 nfs_free_fattr(fattr_fsinfo); 1086 dprintk("<-- nfs_clone_server() = %p\n", server); 1087 return server; 1088 1089 out_free_server: 1090 nfs_free_fattr(fattr_fsinfo); 1091 nfs_free_server(server); 1092 dprintk("<-- nfs_clone_server() = error %d\n", error); 1093 return ERR_PTR(error); 1094 } 1095 EXPORT_SYMBOL_GPL(nfs_clone_server); 1096 1097 void nfs_clients_init(struct net *net) 1098 { 1099 struct nfs_net *nn = net_generic(net, nfs_net_id); 1100 1101 INIT_LIST_HEAD(&nn->nfs_client_list); 1102 INIT_LIST_HEAD(&nn->nfs_volume_list); 1103 #if IS_ENABLED(CONFIG_NFS_V4) 1104 idr_init(&nn->cb_ident_idr); 1105 #endif 1106 spin_lock_init(&nn->nfs_client_lock); 1107 nn->boot_time = ktime_get_real(); 1108 } 1109 1110 #ifdef CONFIG_PROC_FS 1111 static int nfs_server_list_open(struct inode *inode, struct file *file); 1112 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1113 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1114 static void nfs_server_list_stop(struct seq_file *p, void *v); 1115 static int nfs_server_list_show(struct seq_file *m, void *v); 1116 1117 static const struct seq_operations nfs_server_list_ops = { 1118 .start = nfs_server_list_start, 1119 .next = nfs_server_list_next, 1120 .stop = nfs_server_list_stop, 1121 .show = nfs_server_list_show, 1122 }; 1123 1124 static const struct file_operations nfs_server_list_fops = { 1125 .open = nfs_server_list_open, 1126 .read = seq_read, 1127 .llseek = seq_lseek, 1128 .release = seq_release_net, 1129 }; 1130 1131 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1132 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1133 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1134 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1135 static int nfs_volume_list_show(struct seq_file *m, void *v); 1136 1137 static const struct seq_operations nfs_volume_list_ops = { 1138 .start = nfs_volume_list_start, 1139 .next = nfs_volume_list_next, 1140 .stop = nfs_volume_list_stop, 1141 .show = nfs_volume_list_show, 1142 }; 1143 1144 static const struct file_operations nfs_volume_list_fops = { 1145 .open = nfs_volume_list_open, 1146 .read = seq_read, 1147 .llseek = seq_lseek, 1148 .release = seq_release_net, 1149 }; 1150 1151 /* 1152 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1153 * we're dealing 1154 */ 1155 static int nfs_server_list_open(struct inode *inode, struct file *file) 1156 { 1157 return seq_open_net(inode, file, &nfs_server_list_ops, 1158 sizeof(struct seq_net_private)); 1159 } 1160 1161 /* 1162 * set up the iterator to start reading from the server list and return the first item 1163 */ 1164 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1165 __acquires(&nn->nfs_client_lock) 1166 { 1167 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1168 1169 /* lock the list against modification */ 1170 spin_lock(&nn->nfs_client_lock); 1171 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1172 } 1173 1174 /* 1175 * move to next server 1176 */ 1177 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1178 { 1179 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1180 1181 return seq_list_next(v, &nn->nfs_client_list, pos); 1182 } 1183 1184 /* 1185 * clean up after reading from the transports list 1186 */ 1187 static void nfs_server_list_stop(struct seq_file *p, void *v) 1188 __releases(&nn->nfs_client_lock) 1189 { 1190 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1191 1192 spin_unlock(&nn->nfs_client_lock); 1193 } 1194 1195 /* 1196 * display a header line followed by a load of call lines 1197 */ 1198 static int nfs_server_list_show(struct seq_file *m, void *v) 1199 { 1200 struct nfs_client *clp; 1201 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1202 1203 /* display header on line 1 */ 1204 if (v == &nn->nfs_client_list) { 1205 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1206 return 0; 1207 } 1208 1209 /* display one transport per line on subsequent lines */ 1210 clp = list_entry(v, struct nfs_client, cl_share_link); 1211 1212 /* Check if the client is initialized */ 1213 if (clp->cl_cons_state != NFS_CS_READY) 1214 return 0; 1215 1216 rcu_read_lock(); 1217 seq_printf(m, "v%u %s %s %3d %s\n", 1218 clp->rpc_ops->version, 1219 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1220 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1221 atomic_read(&clp->cl_count), 1222 clp->cl_hostname); 1223 rcu_read_unlock(); 1224 1225 return 0; 1226 } 1227 1228 /* 1229 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1230 */ 1231 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1232 { 1233 return seq_open_net(inode, file, &nfs_volume_list_ops, 1234 sizeof(struct seq_net_private)); 1235 } 1236 1237 /* 1238 * set up the iterator to start reading from the volume list and return the first item 1239 */ 1240 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1241 __acquires(&nn->nfs_client_lock) 1242 { 1243 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1244 1245 /* lock the list against modification */ 1246 spin_lock(&nn->nfs_client_lock); 1247 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1248 } 1249 1250 /* 1251 * move to next volume 1252 */ 1253 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1254 { 1255 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1256 1257 return seq_list_next(v, &nn->nfs_volume_list, pos); 1258 } 1259 1260 /* 1261 * clean up after reading from the transports list 1262 */ 1263 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1264 __releases(&nn->nfs_client_lock) 1265 { 1266 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1267 1268 spin_unlock(&nn->nfs_client_lock); 1269 } 1270 1271 /* 1272 * display a header line followed by a load of call lines 1273 */ 1274 static int nfs_volume_list_show(struct seq_file *m, void *v) 1275 { 1276 struct nfs_server *server; 1277 struct nfs_client *clp; 1278 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1279 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1280 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1281 1282 /* display header on line 1 */ 1283 if (v == &nn->nfs_volume_list) { 1284 seq_puts(m, "NV SERVER PORT DEV FSID" 1285 " FSC\n"); 1286 return 0; 1287 } 1288 /* display one transport per line on subsequent lines */ 1289 server = list_entry(v, struct nfs_server, master_link); 1290 clp = server->nfs_client; 1291 1292 snprintf(dev, sizeof(dev), "%u:%u", 1293 MAJOR(server->s_dev), MINOR(server->s_dev)); 1294 1295 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1296 (unsigned long long) server->fsid.major, 1297 (unsigned long long) server->fsid.minor); 1298 1299 rcu_read_lock(); 1300 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1301 clp->rpc_ops->version, 1302 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1303 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1304 dev, 1305 fsid, 1306 nfs_server_fscache_state(server)); 1307 rcu_read_unlock(); 1308 1309 return 0; 1310 } 1311 1312 int nfs_fs_proc_net_init(struct net *net) 1313 { 1314 struct nfs_net *nn = net_generic(net, nfs_net_id); 1315 struct proc_dir_entry *p; 1316 1317 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1318 if (!nn->proc_nfsfs) 1319 goto error_0; 1320 1321 /* a file of servers with which we're dealing */ 1322 p = proc_create("servers", S_IFREG|S_IRUGO, 1323 nn->proc_nfsfs, &nfs_server_list_fops); 1324 if (!p) 1325 goto error_1; 1326 1327 /* a file of volumes that we have mounted */ 1328 p = proc_create("volumes", S_IFREG|S_IRUGO, 1329 nn->proc_nfsfs, &nfs_volume_list_fops); 1330 if (!p) 1331 goto error_1; 1332 return 0; 1333 1334 error_1: 1335 remove_proc_subtree("nfsfs", net->proc_net); 1336 error_0: 1337 return -ENOMEM; 1338 } 1339 1340 void nfs_fs_proc_net_exit(struct net *net) 1341 { 1342 remove_proc_subtree("nfsfs", net->proc_net); 1343 } 1344 1345 /* 1346 * initialise the /proc/fs/nfsfs/ directory 1347 */ 1348 int __init nfs_fs_proc_init(void) 1349 { 1350 if (!proc_mkdir("fs/nfsfs", NULL)) 1351 goto error_0; 1352 1353 /* a file of servers with which we're dealing */ 1354 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1355 goto error_1; 1356 1357 /* a file of volumes that we have mounted */ 1358 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1359 goto error_1; 1360 1361 return 0; 1362 error_1: 1363 remove_proc_subtree("fs/nfsfs", NULL); 1364 error_0: 1365 return -ENOMEM; 1366 } 1367 1368 /* 1369 * clean up the /proc/fs/nfsfs/ directory 1370 */ 1371 void nfs_fs_proc_exit(void) 1372 { 1373 remove_proc_subtree("fs/nfsfs", NULL); 1374 } 1375 1376 #endif /* CONFIG_PROC_FS */ 1377