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_RWLOCK(nfs_version_lock); 59 60 static struct nfs_subversion *nfs_version_mods[5] = { 61 [2] = NULL, 62 [3] = NULL, 63 [4] = NULL, 64 }; 65 66 /* 67 * RPC cruft for NFS 68 */ 69 static const struct rpc_version *nfs_version[5] = { 70 [2] = NULL, 71 [3] = NULL, 72 [4] = NULL, 73 }; 74 75 const struct rpc_program nfs_program = { 76 .name = "nfs", 77 .number = NFS_PROGRAM, 78 .nrvers = ARRAY_SIZE(nfs_version), 79 .version = nfs_version, 80 .pipe_dir_name = NFS_PIPE_DIRNAME, 81 }; 82 83 static struct nfs_subversion *__find_nfs_version(unsigned int version) 84 { 85 struct nfs_subversion *nfs; 86 87 read_lock(&nfs_version_lock); 88 nfs = nfs_version_mods[version]; 89 read_unlock(&nfs_version_lock); 90 return nfs; 91 } 92 93 struct nfs_subversion *find_nfs_version(unsigned int version) 94 { 95 struct nfs_subversion *nfs = __find_nfs_version(version); 96 97 if (!nfs && request_module("nfsv%d", version) == 0) 98 nfs = __find_nfs_version(version); 99 100 if (!nfs) 101 return ERR_PTR(-EPROTONOSUPPORT); 102 103 if (!get_nfs_version(nfs)) 104 return ERR_PTR(-EAGAIN); 105 106 return nfs; 107 } 108 109 int get_nfs_version(struct nfs_subversion *nfs) 110 { 111 return try_module_get(nfs->owner); 112 } 113 EXPORT_SYMBOL_GPL(get_nfs_version); 114 115 void put_nfs_version(struct nfs_subversion *nfs) 116 { 117 module_put(nfs->owner); 118 } 119 120 void register_nfs_version(struct nfs_subversion *nfs) 121 { 122 write_lock(&nfs_version_lock); 123 124 nfs_version_mods[nfs->rpc_ops->version] = nfs; 125 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 126 127 write_unlock(&nfs_version_lock); 128 } 129 EXPORT_SYMBOL_GPL(register_nfs_version); 130 131 void unregister_nfs_version(struct nfs_subversion *nfs) 132 { 133 write_lock(&nfs_version_lock); 134 135 nfs_version[nfs->rpc_ops->version] = NULL; 136 nfs_version_mods[nfs->rpc_ops->version] = NULL; 137 138 write_unlock(&nfs_version_lock); 139 } 140 EXPORT_SYMBOL_GPL(unregister_nfs_version); 141 142 /* 143 * Allocate a shared client record 144 * 145 * Since these are allocated/deallocated very rarely, we don't 146 * bother putting them in a slab cache... 147 */ 148 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 149 { 150 struct nfs_client *clp; 151 int err = -ENOMEM; 152 153 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 154 goto error_0; 155 156 clp->cl_minorversion = cl_init->minorversion; 157 clp->cl_nfs_mod = cl_init->nfs_mod; 158 if (!get_nfs_version(clp->cl_nfs_mod)) 159 goto error_dealloc; 160 161 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 162 163 refcount_set(&clp->cl_count, 1); 164 clp->cl_cons_state = NFS_CS_INITING; 165 166 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 167 clp->cl_addrlen = cl_init->addrlen; 168 169 if (cl_init->hostname) { 170 err = -ENOMEM; 171 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 172 if (!clp->cl_hostname) 173 goto error_cleanup; 174 } 175 176 INIT_LIST_HEAD(&clp->cl_superblocks); 177 clp->cl_rpcclient = ERR_PTR(-EINVAL); 178 179 clp->cl_flags = cl_init->init_flags; 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 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 186 seqlock_init(&clp->cl_boot_lock); 187 ktime_get_real_ts64(&clp->cl_nfssvc_boot); 188 nfs_uuid_init(&clp->cl_uuid); 189 spin_lock_init(&clp->cl_localio_lock); 190 #endif /* CONFIG_NFS_LOCALIO */ 191 192 clp->cl_principal = "*"; 193 clp->cl_xprtsec = cl_init->xprtsec; 194 return clp; 195 196 error_cleanup: 197 put_nfs_version(clp->cl_nfs_mod); 198 error_dealloc: 199 kfree(clp); 200 error_0: 201 return ERR_PTR(err); 202 } 203 EXPORT_SYMBOL_GPL(nfs_alloc_client); 204 205 #if IS_ENABLED(CONFIG_NFS_V4) 206 static void nfs_cleanup_cb_ident_idr(struct net *net) 207 { 208 struct nfs_net *nn = net_generic(net, nfs_net_id); 209 210 idr_destroy(&nn->cb_ident_idr); 211 } 212 213 /* nfs_client_lock held */ 214 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 215 { 216 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 217 218 if (clp->cl_cb_ident) 219 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 220 } 221 222 static void pnfs_init_server(struct nfs_server *server) 223 { 224 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 225 } 226 227 #else 228 static void nfs_cleanup_cb_ident_idr(struct net *net) 229 { 230 } 231 232 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 233 { 234 } 235 236 static void pnfs_init_server(struct nfs_server *server) 237 { 238 } 239 240 #endif /* CONFIG_NFS_V4 */ 241 242 /* 243 * Destroy a shared client record 244 */ 245 void nfs_free_client(struct nfs_client *clp) 246 { 247 nfs_local_disable(clp); 248 249 /* -EIO all pending I/O */ 250 if (!IS_ERR(clp->cl_rpcclient)) 251 rpc_shutdown_client(clp->cl_rpcclient); 252 253 put_net(clp->cl_net); 254 put_nfs_version(clp->cl_nfs_mod); 255 kfree(clp->cl_hostname); 256 kfree(clp->cl_acceptor); 257 kfree_rcu(clp, rcu); 258 } 259 EXPORT_SYMBOL_GPL(nfs_free_client); 260 261 /* 262 * Release a reference to a shared client record 263 */ 264 void nfs_put_client(struct nfs_client *clp) 265 { 266 struct nfs_net *nn; 267 268 if (!clp) 269 return; 270 271 nn = net_generic(clp->cl_net, nfs_net_id); 272 273 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 274 list_del(&clp->cl_share_link); 275 nfs_cb_idr_remove_locked(clp); 276 spin_unlock(&nn->nfs_client_lock); 277 278 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 279 280 clp->rpc_ops->free_client(clp); 281 } 282 } 283 EXPORT_SYMBOL_GPL(nfs_put_client); 284 285 /* 286 * Find an nfs_client on the list that matches the initialisation data 287 * that is supplied. 288 */ 289 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 290 { 291 struct nfs_client *clp; 292 const struct sockaddr *sap = (struct sockaddr *)data->addr; 293 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 294 int error; 295 296 again: 297 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 298 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 299 /* Don't match clients that failed to initialise properly */ 300 if (clp->cl_cons_state < 0) 301 continue; 302 303 /* If a client is still initializing then we need to wait */ 304 if (clp->cl_cons_state > NFS_CS_READY) { 305 refcount_inc(&clp->cl_count); 306 spin_unlock(&nn->nfs_client_lock); 307 error = nfs_wait_client_init_complete(clp); 308 nfs_put_client(clp); 309 spin_lock(&nn->nfs_client_lock); 310 if (error < 0) 311 return ERR_PTR(error); 312 goto again; 313 } 314 315 /* Different NFS versions cannot share the same nfs_client */ 316 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 317 continue; 318 319 if (clp->cl_proto != data->proto) 320 continue; 321 /* Match nfsv4 minorversion */ 322 if (clp->cl_minorversion != data->minorversion) 323 continue; 324 325 /* Match request for a dedicated DS */ 326 if (test_bit(NFS_CS_DS, &data->init_flags) != 327 test_bit(NFS_CS_DS, &clp->cl_flags)) 328 continue; 329 330 /* Match the full socket address */ 331 if (!rpc_cmp_addr_port(sap, clap)) 332 /* Match all xprt_switch full socket addresses */ 333 if (IS_ERR(clp->cl_rpcclient) || 334 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 335 sap)) 336 continue; 337 338 /* Match the xprt security policy */ 339 if (clp->cl_xprtsec.policy != data->xprtsec.policy) 340 continue; 341 342 refcount_inc(&clp->cl_count); 343 return clp; 344 } 345 return NULL; 346 } 347 348 /* 349 * Return true if @clp is done initializing, false if still working on it. 350 * 351 * Use nfs_client_init_status to check if it was successful. 352 */ 353 bool nfs_client_init_is_complete(const struct nfs_client *clp) 354 { 355 return clp->cl_cons_state <= NFS_CS_READY; 356 } 357 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 358 359 /* 360 * Return 0 if @clp was successfully initialized, -errno otherwise. 361 * 362 * This must be called *after* nfs_client_init_is_complete() returns true, 363 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 364 */ 365 int nfs_client_init_status(const struct nfs_client *clp) 366 { 367 /* called without checking nfs_client_init_is_complete */ 368 if (clp->cl_cons_state > NFS_CS_READY) { 369 WARN_ON_ONCE(1); 370 return -EINVAL; 371 } 372 return clp->cl_cons_state; 373 } 374 EXPORT_SYMBOL_GPL(nfs_client_init_status); 375 376 int nfs_wait_client_init_complete(const struct nfs_client *clp) 377 { 378 return wait_event_killable(nfs_client_active_wq, 379 nfs_client_init_is_complete(clp)); 380 } 381 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 382 383 /* 384 * Found an existing client. Make sure it's ready before returning. 385 */ 386 static struct nfs_client * 387 nfs_found_client(const struct nfs_client_initdata *cl_init, 388 struct nfs_client *clp) 389 { 390 int error; 391 392 error = nfs_wait_client_init_complete(clp); 393 if (error < 0) { 394 nfs_put_client(clp); 395 return ERR_PTR(-ERESTARTSYS); 396 } 397 398 if (clp->cl_cons_state < NFS_CS_READY) { 399 error = clp->cl_cons_state; 400 nfs_put_client(clp); 401 return ERR_PTR(error); 402 } 403 404 smp_rmb(); 405 return clp; 406 } 407 408 /* 409 * Look up a client by IP address and protocol version 410 * - creates a new record if one doesn't yet exist 411 */ 412 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 413 { 414 struct nfs_client *clp, *new = NULL; 415 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 416 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 417 418 if (cl_init->hostname == NULL) { 419 WARN_ON(1); 420 return ERR_PTR(-EINVAL); 421 } 422 423 /* see if the client already exists */ 424 do { 425 spin_lock(&nn->nfs_client_lock); 426 427 clp = nfs_match_client(cl_init); 428 if (clp) { 429 spin_unlock(&nn->nfs_client_lock); 430 if (new) 431 new->rpc_ops->free_client(new); 432 if (IS_ERR(clp)) 433 return clp; 434 return nfs_found_client(cl_init, clp); 435 } 436 if (new) { 437 list_add_tail(&new->cl_share_link, 438 &nn->nfs_client_list); 439 spin_unlock(&nn->nfs_client_lock); 440 new = rpc_ops->init_client(new, cl_init); 441 if (!IS_ERR(new)) 442 nfs_local_probe(new); 443 return new; 444 } 445 446 spin_unlock(&nn->nfs_client_lock); 447 448 new = rpc_ops->alloc_client(cl_init); 449 } while (!IS_ERR(new)); 450 451 return new; 452 } 453 EXPORT_SYMBOL_GPL(nfs_get_client); 454 455 /* 456 * Mark a server as ready or failed 457 */ 458 void nfs_mark_client_ready(struct nfs_client *clp, int state) 459 { 460 smp_wmb(); 461 clp->cl_cons_state = state; 462 wake_up_all(&nfs_client_active_wq); 463 } 464 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 465 466 /* 467 * Initialise the timeout values for a connection 468 */ 469 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 470 int timeo, int retrans) 471 { 472 to->to_initval = timeo * HZ / 10; 473 to->to_retries = retrans; 474 475 switch (proto) { 476 case XPRT_TRANSPORT_TCP: 477 case XPRT_TRANSPORT_TCP_TLS: 478 case XPRT_TRANSPORT_RDMA: 479 if (retrans == NFS_UNSPEC_RETRANS) 480 to->to_retries = NFS_DEF_TCP_RETRANS; 481 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 482 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 483 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 484 to->to_initval = NFS_MAX_TCP_TIMEOUT; 485 to->to_increment = to->to_initval; 486 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 487 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 488 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 489 if (to->to_maxval < to->to_initval) 490 to->to_maxval = to->to_initval; 491 to->to_exponential = 0; 492 break; 493 case XPRT_TRANSPORT_UDP: 494 if (retrans == NFS_UNSPEC_RETRANS) 495 to->to_retries = NFS_DEF_UDP_RETRANS; 496 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 497 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 498 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 499 to->to_initval = NFS_MAX_UDP_TIMEOUT; 500 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 501 to->to_exponential = 1; 502 break; 503 default: 504 BUG(); 505 } 506 } 507 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 508 509 /* 510 * Create an RPC client handle 511 */ 512 int nfs_create_rpc_client(struct nfs_client *clp, 513 const struct nfs_client_initdata *cl_init, 514 rpc_authflavor_t flavor) 515 { 516 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 517 struct rpc_clnt *clnt = NULL; 518 struct rpc_create_args args = { 519 .net = clp->cl_net, 520 .protocol = clp->cl_proto, 521 .nconnect = clp->cl_nconnect, 522 .address = (struct sockaddr *)&clp->cl_addr, 523 .addrsize = clp->cl_addrlen, 524 .timeout = cl_init->timeparms, 525 .servername = clp->cl_hostname, 526 .nodename = cl_init->nodename, 527 .program = &nfs_program, 528 .stats = &nn->rpcstats, 529 .version = clp->rpc_ops->version, 530 .authflavor = flavor, 531 .cred = cl_init->cred, 532 .xprtsec = cl_init->xprtsec, 533 .connect_timeout = cl_init->connect_timeout, 534 .reconnect_timeout = cl_init->reconnect_timeout, 535 }; 536 537 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 538 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 539 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 540 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 541 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 542 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 543 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 544 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 545 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 546 args.flags |= RPC_CLNT_CREATE_NOPING; 547 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 548 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 549 550 if (!IS_ERR(clp->cl_rpcclient)) 551 return 0; 552 553 clnt = rpc_create(&args); 554 if (IS_ERR(clnt)) { 555 dprintk("%s: cannot create RPC client. Error = %ld\n", 556 __func__, PTR_ERR(clnt)); 557 return PTR_ERR(clnt); 558 } 559 560 clnt->cl_principal = clp->cl_principal; 561 clp->cl_rpcclient = clnt; 562 clnt->cl_max_connect = clp->cl_max_connect; 563 return 0; 564 } 565 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 566 567 /* 568 * Version 2 or 3 client destruction 569 */ 570 static void nfs_destroy_server(struct nfs_server *server) 571 { 572 if (server->nlm_host) 573 nlmclnt_done(server->nlm_host); 574 } 575 576 /* 577 * Version 2 or 3 lockd setup 578 */ 579 static int nfs_start_lockd(struct nfs_server *server) 580 { 581 struct nlm_host *host; 582 struct nfs_client *clp = server->nfs_client; 583 struct nlmclnt_initdata nlm_init = { 584 .hostname = clp->cl_hostname, 585 .address = (struct sockaddr *)&clp->cl_addr, 586 .addrlen = clp->cl_addrlen, 587 .nfs_version = clp->rpc_ops->version, 588 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 589 1 : 0, 590 .net = clp->cl_net, 591 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 592 .cred = server->cred, 593 }; 594 595 if (nlm_init.nfs_version > 3) 596 return 0; 597 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 598 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 599 return 0; 600 601 switch (clp->cl_proto) { 602 default: 603 nlm_init.protocol = IPPROTO_TCP; 604 break; 605 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 606 case XPRT_TRANSPORT_UDP: 607 nlm_init.protocol = IPPROTO_UDP; 608 #endif 609 } 610 611 host = nlmclnt_init(&nlm_init); 612 if (IS_ERR(host)) 613 return PTR_ERR(host); 614 615 server->nlm_host = host; 616 server->destroy = nfs_destroy_server; 617 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 618 return 0; 619 } 620 621 /* 622 * Create a general RPC client 623 */ 624 int nfs_init_server_rpcclient(struct nfs_server *server, 625 const struct rpc_timeout *timeo, 626 rpc_authflavor_t pseudoflavour) 627 { 628 struct nfs_client *clp = server->nfs_client; 629 630 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 631 pseudoflavour); 632 if (IS_ERR(server->client)) { 633 dprintk("%s: couldn't create rpc_client!\n", __func__); 634 return PTR_ERR(server->client); 635 } 636 637 memcpy(&server->client->cl_timeout_default, 638 timeo, 639 sizeof(server->client->cl_timeout_default)); 640 server->client->cl_timeout = &server->client->cl_timeout_default; 641 server->client->cl_softrtry = 0; 642 if (server->flags & NFS_MOUNT_SOFTERR) 643 server->client->cl_softerr = 1; 644 if (server->flags & NFS_MOUNT_SOFT) 645 server->client->cl_softrtry = 1; 646 647 nfs_sysfs_link_rpc_client(server, server->client, NULL); 648 return 0; 649 } 650 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 651 652 /** 653 * nfs_init_client - Initialise an NFS2 or NFS3 client 654 * 655 * @clp: nfs_client to initialise 656 * @cl_init: Initialisation parameters 657 * 658 * Returns pointer to an NFS client, or an ERR_PTR value. 659 */ 660 struct nfs_client *nfs_init_client(struct nfs_client *clp, 661 const struct nfs_client_initdata *cl_init) 662 { 663 int error; 664 665 /* the client is already initialised */ 666 if (clp->cl_cons_state == NFS_CS_READY) 667 return clp; 668 669 /* 670 * Create a client RPC handle for doing FSSTAT with UNIX auth only 671 * - RFC 2623, sec 2.3.2 672 */ 673 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 674 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 675 if (error < 0) { 676 nfs_put_client(clp); 677 clp = ERR_PTR(error); 678 } 679 return clp; 680 } 681 EXPORT_SYMBOL_GPL(nfs_init_client); 682 683 /* 684 * Create a version 2 or 3 client 685 */ 686 static int nfs_init_server(struct nfs_server *server, 687 const struct fs_context *fc) 688 { 689 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 690 struct rpc_timeout timeparms; 691 struct nfs_client_initdata cl_init = { 692 .hostname = ctx->nfs_server.hostname, 693 .addr = &ctx->nfs_server._address, 694 .addrlen = ctx->nfs_server.addrlen, 695 .nfs_mod = ctx->nfs_mod, 696 .proto = ctx->nfs_server.protocol, 697 .net = fc->net_ns, 698 .timeparms = &timeparms, 699 .cred = server->cred, 700 .nconnect = ctx->nfs_server.nconnect, 701 .init_flags = (1UL << NFS_CS_REUSEPORT), 702 .xprtsec = ctx->xprtsec, 703 }; 704 struct nfs_client *clp; 705 int error; 706 707 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 708 ctx->timeo, ctx->retrans); 709 if (ctx->flags & NFS_MOUNT_NORESVPORT) 710 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 711 712 /* Allocate or find a client reference we can use */ 713 clp = nfs_get_client(&cl_init); 714 if (IS_ERR(clp)) 715 return PTR_ERR(clp); 716 717 server->nfs_client = clp; 718 nfs_sysfs_add_server(server); 719 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 720 721 /* Initialise the client representation from the mount data */ 722 server->flags = ctx->flags; 723 server->options = ctx->options; 724 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 725 726 switch (clp->rpc_ops->version) { 727 case 2: 728 server->fattr_valid = NFS_ATTR_FATTR_V2; 729 break; 730 case 3: 731 server->fattr_valid = NFS_ATTR_FATTR_V3; 732 break; 733 default: 734 server->fattr_valid = NFS_ATTR_FATTR_V4; 735 } 736 737 if (ctx->rsize) 738 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 739 if (ctx->wsize) 740 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 741 742 server->acregmin = ctx->acregmin * HZ; 743 server->acregmax = ctx->acregmax * HZ; 744 server->acdirmin = ctx->acdirmin * HZ; 745 server->acdirmax = ctx->acdirmax * HZ; 746 747 /* Start lockd here, before we might error out */ 748 error = nfs_start_lockd(server); 749 if (error < 0) 750 goto error; 751 752 server->port = ctx->nfs_server.port; 753 server->auth_info = ctx->auth_info; 754 755 error = nfs_init_server_rpcclient(server, &timeparms, 756 ctx->selected_flavor); 757 if (error < 0) 758 goto error; 759 760 /* Preserve the values of mount_server-related mount options */ 761 if (ctx->mount_server.addrlen) { 762 memcpy(&server->mountd_address, &ctx->mount_server.address, 763 ctx->mount_server.addrlen); 764 server->mountd_addrlen = ctx->mount_server.addrlen; 765 } 766 server->mountd_version = ctx->mount_server.version; 767 server->mountd_port = ctx->mount_server.port; 768 server->mountd_protocol = ctx->mount_server.protocol; 769 770 server->namelen = ctx->namlen; 771 return 0; 772 773 error: 774 server->nfs_client = NULL; 775 nfs_put_client(clp); 776 return error; 777 } 778 779 /* 780 * Load up the server record from information gained in an fsinfo record 781 */ 782 static void nfs_server_set_fsinfo(struct nfs_server *server, 783 struct nfs_fsinfo *fsinfo) 784 { 785 struct nfs_client *clp = server->nfs_client; 786 unsigned long max_rpc_payload, raw_max_rpc_payload; 787 788 /* Work out a lot of parameters */ 789 if (server->rsize == 0) 790 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 791 if (server->wsize == 0) 792 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 793 794 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 795 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 796 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 797 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 798 799 raw_max_rpc_payload = rpc_max_payload(server->client); 800 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 801 802 if (server->rsize > max_rpc_payload) 803 server->rsize = max_rpc_payload; 804 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 805 server->rsize = NFS_MAX_FILE_IO_SIZE; 806 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 807 808 if (server->wsize > max_rpc_payload) 809 server->wsize = max_rpc_payload; 810 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 811 server->wsize = NFS_MAX_FILE_IO_SIZE; 812 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 813 814 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 815 816 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 817 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 818 server->dtsize = NFS_MAX_FILE_IO_SIZE; 819 if (server->dtsize > server->rsize) 820 server->dtsize = server->rsize; 821 822 if (server->flags & NFS_MOUNT_NOAC) { 823 server->acregmin = server->acregmax = 0; 824 server->acdirmin = server->acdirmax = 0; 825 } 826 827 server->maxfilesize = fsinfo->maxfilesize; 828 829 server->time_delta = fsinfo->time_delta; 830 server->change_attr_type = fsinfo->change_attr_type; 831 832 server->clone_blksize = fsinfo->clone_blksize; 833 /* We're airborne Set socket buffersize */ 834 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 835 836 #ifdef CONFIG_NFS_V4_2 837 /* 838 * Defaults until limited by the session parameters. 839 */ 840 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 841 XATTR_SIZE_MAX); 842 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 843 XATTR_SIZE_MAX); 844 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 845 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 846 847 if (fsinfo->xattr_support) 848 server->caps |= NFS_CAP_XATTR; 849 #endif 850 } 851 852 /* 853 * Probe filesystem information, including the FSID on v2/v3 854 */ 855 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 856 { 857 struct nfs_fsinfo fsinfo; 858 struct nfs_client *clp = server->nfs_client; 859 int error; 860 861 if (clp->rpc_ops->set_capabilities != NULL) { 862 error = clp->rpc_ops->set_capabilities(server, mntfh); 863 if (error < 0) 864 return error; 865 } 866 867 fsinfo.fattr = fattr; 868 fsinfo.nlayouttypes = 0; 869 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 870 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 871 if (error < 0) 872 return error; 873 874 nfs_server_set_fsinfo(server, &fsinfo); 875 876 /* Get some general file system info */ 877 if (server->namelen == 0) { 878 struct nfs_pathconf pathinfo; 879 880 pathinfo.fattr = fattr; 881 nfs_fattr_init(fattr); 882 883 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 884 server->namelen = pathinfo.max_namelen; 885 } 886 887 if (clp->rpc_ops->discover_trunking != NULL && 888 (server->caps & NFS_CAP_FS_LOCATIONS && 889 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 890 error = clp->rpc_ops->discover_trunking(server, mntfh); 891 if (error < 0) 892 return error; 893 } 894 895 return 0; 896 } 897 898 /* 899 * Grab the destination's particulars, including lease expiry time. 900 * 901 * Returns zero if probe succeeded and retrieved FSID matches the FSID 902 * we have cached. 903 */ 904 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 905 { 906 struct nfs_fattr *fattr; 907 int error; 908 909 fattr = nfs_alloc_fattr(); 910 if (fattr == NULL) 911 return -ENOMEM; 912 913 /* Sanity: the probe won't work if the destination server 914 * does not recognize the migrated FH. */ 915 error = nfs_probe_fsinfo(server, mntfh, fattr); 916 917 nfs_free_fattr(fattr); 918 return error; 919 } 920 EXPORT_SYMBOL_GPL(nfs_probe_server); 921 922 /* 923 * Copy useful information when duplicating a server record 924 */ 925 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 926 { 927 target->flags = source->flags; 928 target->rsize = source->rsize; 929 target->wsize = source->wsize; 930 target->acregmin = source->acregmin; 931 target->acregmax = source->acregmax; 932 target->acdirmin = source->acdirmin; 933 target->acdirmax = source->acdirmax; 934 target->caps = source->caps; 935 target->options = source->options; 936 target->auth_info = source->auth_info; 937 target->port = source->port; 938 } 939 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 940 941 void nfs_server_insert_lists(struct nfs_server *server) 942 { 943 struct nfs_client *clp = server->nfs_client; 944 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 945 946 spin_lock(&nn->nfs_client_lock); 947 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 948 list_add_tail(&server->master_link, &nn->nfs_volume_list); 949 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 950 spin_unlock(&nn->nfs_client_lock); 951 952 } 953 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 954 955 void nfs_server_remove_lists(struct nfs_server *server) 956 { 957 struct nfs_client *clp = server->nfs_client; 958 struct nfs_net *nn; 959 960 if (clp == NULL) 961 return; 962 nn = net_generic(clp->cl_net, nfs_net_id); 963 spin_lock(&nn->nfs_client_lock); 964 list_del_rcu(&server->client_link); 965 if (list_empty(&clp->cl_superblocks)) 966 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 967 list_del(&server->master_link); 968 spin_unlock(&nn->nfs_client_lock); 969 970 synchronize_rcu(); 971 } 972 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 973 974 static DEFINE_IDA(s_sysfs_ids); 975 976 /* 977 * Allocate and initialise a server record 978 */ 979 struct nfs_server *nfs_alloc_server(void) 980 { 981 struct nfs_server *server; 982 983 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 984 if (!server) 985 return NULL; 986 987 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 988 if (server->s_sysfs_id < 0) { 989 kfree(server); 990 return NULL; 991 } 992 993 server->client = server->client_acl = ERR_PTR(-EINVAL); 994 995 /* Zero out the NFS state stuff */ 996 INIT_LIST_HEAD(&server->client_link); 997 INIT_LIST_HEAD(&server->master_link); 998 INIT_LIST_HEAD(&server->delegations); 999 INIT_LIST_HEAD(&server->layouts); 1000 INIT_LIST_HEAD(&server->state_owners_lru); 1001 INIT_LIST_HEAD(&server->ss_copies); 1002 INIT_LIST_HEAD(&server->ss_src_copies); 1003 1004 atomic_set(&server->active, 0); 1005 1006 server->io_stats = nfs_alloc_iostats(); 1007 if (!server->io_stats) { 1008 kfree(server); 1009 return NULL; 1010 } 1011 1012 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 1013 1014 init_waitqueue_head(&server->write_congestion_wait); 1015 atomic_long_set(&server->writeback, 0); 1016 1017 atomic64_set(&server->owner_ctr, 0); 1018 1019 pnfs_init_server(server); 1020 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1021 1022 return server; 1023 } 1024 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1025 1026 static void delayed_free(struct rcu_head *p) 1027 { 1028 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1029 1030 nfs_free_iostats(server->io_stats); 1031 kfree(server); 1032 } 1033 1034 /* 1035 * Free up a server record 1036 */ 1037 void nfs_free_server(struct nfs_server *server) 1038 { 1039 nfs_server_remove_lists(server); 1040 1041 if (server->destroy != NULL) 1042 server->destroy(server); 1043 1044 if (!IS_ERR(server->client_acl)) 1045 rpc_shutdown_client(server->client_acl); 1046 if (!IS_ERR(server->client)) 1047 rpc_shutdown_client(server->client); 1048 1049 nfs_put_client(server->nfs_client); 1050 1051 if (server->kobj.state_initialized) { 1052 nfs_sysfs_remove_server(server); 1053 kobject_put(&server->kobj); 1054 } 1055 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1056 1057 put_cred(server->cred); 1058 nfs_release_automount_timer(); 1059 call_rcu(&server->rcu, delayed_free); 1060 } 1061 EXPORT_SYMBOL_GPL(nfs_free_server); 1062 1063 /* 1064 * Create a version 2 or 3 volume record 1065 * - keyed on server and FSID 1066 */ 1067 struct nfs_server *nfs_create_server(struct fs_context *fc) 1068 { 1069 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1070 struct nfs_server *server; 1071 struct nfs_fattr *fattr; 1072 int error; 1073 1074 server = nfs_alloc_server(); 1075 if (!server) 1076 return ERR_PTR(-ENOMEM); 1077 1078 server->cred = get_cred(fc->cred); 1079 1080 error = -ENOMEM; 1081 fattr = nfs_alloc_fattr(); 1082 if (fattr == NULL) 1083 goto error; 1084 1085 /* Get a client representation */ 1086 error = nfs_init_server(server, fc); 1087 if (error < 0) 1088 goto error; 1089 1090 /* Probe the root fh to retrieve its FSID */ 1091 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1092 if (error < 0) 1093 goto error; 1094 if (server->nfs_client->rpc_ops->version == 3) { 1095 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1096 server->namelen = NFS3_MAXNAMLEN; 1097 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1098 server->caps |= NFS_CAP_READDIRPLUS; 1099 } else { 1100 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1101 server->namelen = NFS2_MAXNAMLEN; 1102 } 1103 1104 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1105 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1106 fattr, NULL); 1107 if (error < 0) { 1108 dprintk("nfs_create_server: getattr error = %d\n", -error); 1109 goto error; 1110 } 1111 } 1112 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1113 1114 dprintk("Server FSID: %llx:%llx\n", 1115 (unsigned long long) server->fsid.major, 1116 (unsigned long long) server->fsid.minor); 1117 1118 nfs_server_insert_lists(server); 1119 server->mount_time = jiffies; 1120 nfs_free_fattr(fattr); 1121 return server; 1122 1123 error: 1124 nfs_free_fattr(fattr); 1125 nfs_free_server(server); 1126 return ERR_PTR(error); 1127 } 1128 EXPORT_SYMBOL_GPL(nfs_create_server); 1129 1130 /* 1131 * Clone an NFS2, NFS3 or NFS4 server record 1132 */ 1133 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1134 struct nfs_fh *fh, 1135 struct nfs_fattr *fattr, 1136 rpc_authflavor_t flavor) 1137 { 1138 struct nfs_server *server; 1139 int error; 1140 1141 server = nfs_alloc_server(); 1142 if (!server) 1143 return ERR_PTR(-ENOMEM); 1144 1145 server->cred = get_cred(source->cred); 1146 1147 /* Copy data from the source */ 1148 server->nfs_client = source->nfs_client; 1149 server->destroy = source->destroy; 1150 refcount_inc(&server->nfs_client->cl_count); 1151 nfs_server_copy_userdata(server, source); 1152 1153 server->fsid = fattr->fsid; 1154 1155 nfs_sysfs_add_server(server); 1156 1157 nfs_sysfs_link_rpc_client(server, 1158 server->nfs_client->cl_rpcclient, "_state"); 1159 1160 error = nfs_init_server_rpcclient(server, 1161 source->client->cl_timeout, 1162 flavor); 1163 if (error < 0) 1164 goto out_free_server; 1165 1166 /* probe the filesystem info for this server filesystem */ 1167 error = nfs_probe_server(server, fh); 1168 if (error < 0) 1169 goto out_free_server; 1170 1171 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1172 server->namelen = NFS4_MAXNAMLEN; 1173 1174 error = nfs_start_lockd(server); 1175 if (error < 0) 1176 goto out_free_server; 1177 1178 nfs_server_insert_lists(server); 1179 server->mount_time = jiffies; 1180 1181 return server; 1182 1183 out_free_server: 1184 nfs_free_server(server); 1185 return ERR_PTR(error); 1186 } 1187 EXPORT_SYMBOL_GPL(nfs_clone_server); 1188 1189 void nfs_clients_init(struct net *net) 1190 { 1191 struct nfs_net *nn = net_generic(net, nfs_net_id); 1192 1193 INIT_LIST_HEAD(&nn->nfs_client_list); 1194 INIT_LIST_HEAD(&nn->nfs_volume_list); 1195 #if IS_ENABLED(CONFIG_NFS_V4) 1196 idr_init(&nn->cb_ident_idr); 1197 #endif 1198 spin_lock_init(&nn->nfs_client_lock); 1199 nn->boot_time = ktime_get_real(); 1200 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1201 nn->rpcstats.program = &nfs_program; 1202 1203 nfs_netns_sysfs_setup(nn, net); 1204 } 1205 1206 void nfs_clients_exit(struct net *net) 1207 { 1208 struct nfs_net *nn = net_generic(net, nfs_net_id); 1209 1210 nfs_netns_sysfs_destroy(nn); 1211 nfs_cleanup_cb_ident_idr(net); 1212 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1213 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1214 } 1215 1216 #ifdef CONFIG_PROC_FS 1217 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1218 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1219 static void nfs_server_list_stop(struct seq_file *p, void *v); 1220 static int nfs_server_list_show(struct seq_file *m, void *v); 1221 1222 static const struct seq_operations nfs_server_list_ops = { 1223 .start = nfs_server_list_start, 1224 .next = nfs_server_list_next, 1225 .stop = nfs_server_list_stop, 1226 .show = nfs_server_list_show, 1227 }; 1228 1229 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1230 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1231 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1232 static int nfs_volume_list_show(struct seq_file *m, void *v); 1233 1234 static const struct seq_operations nfs_volume_list_ops = { 1235 .start = nfs_volume_list_start, 1236 .next = nfs_volume_list_next, 1237 .stop = nfs_volume_list_stop, 1238 .show = nfs_volume_list_show, 1239 }; 1240 1241 /* 1242 * set up the iterator to start reading from the server list and return the first item 1243 */ 1244 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1245 __acquires(&nn->nfs_client_lock) 1246 { 1247 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1248 1249 /* lock the list against modification */ 1250 spin_lock(&nn->nfs_client_lock); 1251 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1252 } 1253 1254 /* 1255 * move to next server 1256 */ 1257 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1258 { 1259 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1260 1261 return seq_list_next(v, &nn->nfs_client_list, pos); 1262 } 1263 1264 /* 1265 * clean up after reading from the transports list 1266 */ 1267 static void nfs_server_list_stop(struct seq_file *p, void *v) 1268 __releases(&nn->nfs_client_lock) 1269 { 1270 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1271 1272 spin_unlock(&nn->nfs_client_lock); 1273 } 1274 1275 /* 1276 * display a header line followed by a load of call lines 1277 */ 1278 static int nfs_server_list_show(struct seq_file *m, void *v) 1279 { 1280 struct nfs_client *clp; 1281 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1282 1283 /* display header on line 1 */ 1284 if (v == &nn->nfs_client_list) { 1285 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1286 return 0; 1287 } 1288 1289 /* display one transport per line on subsequent lines */ 1290 clp = list_entry(v, struct nfs_client, cl_share_link); 1291 1292 /* Check if the client is initialized */ 1293 if (clp->cl_cons_state != NFS_CS_READY) 1294 return 0; 1295 1296 rcu_read_lock(); 1297 seq_printf(m, "v%u %s %s %3d %s\n", 1298 clp->rpc_ops->version, 1299 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1300 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1301 refcount_read(&clp->cl_count), 1302 clp->cl_hostname); 1303 rcu_read_unlock(); 1304 1305 return 0; 1306 } 1307 1308 /* 1309 * set up the iterator to start reading from the volume list and return the first item 1310 */ 1311 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1312 __acquires(&nn->nfs_client_lock) 1313 { 1314 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1315 1316 /* lock the list against modification */ 1317 spin_lock(&nn->nfs_client_lock); 1318 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1319 } 1320 1321 /* 1322 * move to next volume 1323 */ 1324 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1325 { 1326 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1327 1328 return seq_list_next(v, &nn->nfs_volume_list, pos); 1329 } 1330 1331 /* 1332 * clean up after reading from the transports list 1333 */ 1334 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1335 __releases(&nn->nfs_client_lock) 1336 { 1337 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1338 1339 spin_unlock(&nn->nfs_client_lock); 1340 } 1341 1342 /* 1343 * display a header line followed by a load of call lines 1344 */ 1345 static int nfs_volume_list_show(struct seq_file *m, void *v) 1346 { 1347 struct nfs_server *server; 1348 struct nfs_client *clp; 1349 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1350 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1351 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1352 1353 /* display header on line 1 */ 1354 if (v == &nn->nfs_volume_list) { 1355 seq_puts(m, "NV SERVER PORT DEV FSID" 1356 " FSC\n"); 1357 return 0; 1358 } 1359 /* display one transport per line on subsequent lines */ 1360 server = list_entry(v, struct nfs_server, master_link); 1361 clp = server->nfs_client; 1362 1363 snprintf(dev, sizeof(dev), "%u:%u", 1364 MAJOR(server->s_dev), MINOR(server->s_dev)); 1365 1366 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1367 (unsigned long long) server->fsid.major, 1368 (unsigned long long) server->fsid.minor); 1369 1370 rcu_read_lock(); 1371 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1372 clp->rpc_ops->version, 1373 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1374 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1375 dev, 1376 fsid, 1377 nfs_server_fscache_state(server)); 1378 rcu_read_unlock(); 1379 1380 return 0; 1381 } 1382 1383 int nfs_fs_proc_net_init(struct net *net) 1384 { 1385 struct nfs_net *nn = net_generic(net, nfs_net_id); 1386 struct proc_dir_entry *p; 1387 1388 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1389 if (!nn->proc_nfsfs) 1390 goto error_0; 1391 1392 /* a file of servers with which we're dealing */ 1393 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1394 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1395 if (!p) 1396 goto error_1; 1397 1398 /* a file of volumes that we have mounted */ 1399 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1400 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1401 if (!p) 1402 goto error_1; 1403 return 0; 1404 1405 error_1: 1406 remove_proc_subtree("nfsfs", net->proc_net); 1407 error_0: 1408 return -ENOMEM; 1409 } 1410 1411 void nfs_fs_proc_net_exit(struct net *net) 1412 { 1413 remove_proc_subtree("nfsfs", net->proc_net); 1414 } 1415 1416 /* 1417 * initialise the /proc/fs/nfsfs/ directory 1418 */ 1419 int __init nfs_fs_proc_init(void) 1420 { 1421 if (!proc_mkdir("fs/nfsfs", NULL)) 1422 goto error_0; 1423 1424 /* a file of servers with which we're dealing */ 1425 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1426 goto error_1; 1427 1428 /* a file of volumes that we have mounted */ 1429 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1430 goto error_1; 1431 1432 return 0; 1433 error_1: 1434 remove_proc_subtree("fs/nfsfs", NULL); 1435 error_0: 1436 return -ENOMEM; 1437 } 1438 1439 /* 1440 * clean up the /proc/fs/nfsfs/ directory 1441 */ 1442 void nfs_fs_proc_exit(void) 1443 { 1444 remove_proc_subtree("fs/nfsfs", NULL); 1445 ida_destroy(&s_sysfs_ids); 1446 } 1447 1448 #endif /* CONFIG_PROC_FS */ 1449