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 #include <linux/nfslocalio.h> 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_track(cl_init->net, &clp->cl_ns_tracker, GFP_KERNEL); 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 INIT_WORK(&clp->cl_local_probe_work, nfs_local_probe_async_work); 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_localio_disable_client(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_track(clp->cl_net, &clp->cl_ns_tracker); 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_async(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 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 550 args.flags |= RPC_CLNT_CREATE_NETUNREACH_FATAL; 551 552 if (!IS_ERR(clp->cl_rpcclient)) 553 return 0; 554 555 clnt = rpc_create(&args); 556 if (IS_ERR(clnt)) { 557 dprintk("%s: cannot create RPC client. Error = %ld\n", 558 __func__, PTR_ERR(clnt)); 559 return PTR_ERR(clnt); 560 } 561 562 clnt->cl_principal = clp->cl_principal; 563 clp->cl_rpcclient = clnt; 564 clnt->cl_max_connect = clp->cl_max_connect; 565 return 0; 566 } 567 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 568 569 /* 570 * Version 2 or 3 client destruction 571 */ 572 static void nfs_destroy_server(struct nfs_server *server) 573 { 574 if (server->nlm_host) 575 nlmclnt_done(server->nlm_host); 576 } 577 578 /* 579 * Version 2 or 3 lockd setup 580 */ 581 static int nfs_start_lockd(struct nfs_server *server) 582 { 583 struct nlm_host *host; 584 struct nfs_client *clp = server->nfs_client; 585 struct nlmclnt_initdata nlm_init = { 586 .hostname = clp->cl_hostname, 587 .address = (struct sockaddr *)&clp->cl_addr, 588 .addrlen = clp->cl_addrlen, 589 .nfs_version = clp->rpc_ops->version, 590 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 591 1 : 0, 592 .net = clp->cl_net, 593 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 594 .cred = server->cred, 595 }; 596 597 if (nlm_init.nfs_version > 3) 598 return 0; 599 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 600 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 601 return 0; 602 603 switch (clp->cl_proto) { 604 default: 605 nlm_init.protocol = IPPROTO_TCP; 606 break; 607 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 608 case XPRT_TRANSPORT_UDP: 609 nlm_init.protocol = IPPROTO_UDP; 610 #endif 611 } 612 613 host = nlmclnt_init(&nlm_init); 614 if (IS_ERR(host)) 615 return PTR_ERR(host); 616 617 server->nlm_host = host; 618 server->destroy = nfs_destroy_server; 619 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 620 return 0; 621 } 622 623 /* 624 * Create a general RPC client 625 */ 626 int nfs_init_server_rpcclient(struct nfs_server *server, 627 const struct rpc_timeout *timeo, 628 rpc_authflavor_t pseudoflavour) 629 { 630 struct nfs_client *clp = server->nfs_client; 631 632 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 633 pseudoflavour); 634 if (IS_ERR(server->client)) { 635 dprintk("%s: couldn't create rpc_client!\n", __func__); 636 return PTR_ERR(server->client); 637 } 638 639 memcpy(&server->client->cl_timeout_default, 640 timeo, 641 sizeof(server->client->cl_timeout_default)); 642 server->client->cl_timeout = &server->client->cl_timeout_default; 643 server->client->cl_softrtry = 0; 644 if (server->flags & NFS_MOUNT_SOFTERR) 645 server->client->cl_softerr = 1; 646 if (server->flags & NFS_MOUNT_SOFT) 647 server->client->cl_softrtry = 1; 648 649 nfs_sysfs_link_rpc_client(server, server->client, NULL); 650 return 0; 651 } 652 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 653 654 /** 655 * nfs_init_client - Initialise an NFS2 or NFS3 client 656 * 657 * @clp: nfs_client to initialise 658 * @cl_init: Initialisation parameters 659 * 660 * Returns pointer to an NFS client, or an ERR_PTR value. 661 */ 662 struct nfs_client *nfs_init_client(struct nfs_client *clp, 663 const struct nfs_client_initdata *cl_init) 664 { 665 int error; 666 667 /* the client is already initialised */ 668 if (clp->cl_cons_state == NFS_CS_READY) 669 return clp; 670 671 /* 672 * Create a client RPC handle for doing FSSTAT with UNIX auth only 673 * - RFC 2623, sec 2.3.2 674 */ 675 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 676 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 677 if (error < 0) { 678 nfs_put_client(clp); 679 clp = ERR_PTR(error); 680 } 681 return clp; 682 } 683 EXPORT_SYMBOL_GPL(nfs_init_client); 684 685 static void nfs4_server_set_init_caps(struct nfs_server *server) 686 { 687 #if IS_ENABLED(CONFIG_NFS_V4) 688 /* Set the basic capabilities */ 689 server->caps = server->nfs_client->cl_mvops->init_caps; 690 if (server->flags & NFS_MOUNT_NORDIRPLUS) 691 server->caps &= ~NFS_CAP_READDIRPLUS; 692 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA) 693 server->caps &= ~NFS_CAP_READ_PLUS; 694 695 /* 696 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 697 * authentication. 698 */ 699 if (nfs4_disable_idmapping && 700 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 701 server->caps |= NFS_CAP_UIDGID_NOMAP; 702 #endif 703 } 704 705 void nfs_server_set_init_caps(struct nfs_server *server) 706 { 707 switch (server->nfs_client->rpc_ops->version) { 708 case 2: 709 server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 710 break; 711 case 3: 712 server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 713 if (!(server->flags & NFS_MOUNT_NORDIRPLUS)) 714 server->caps |= NFS_CAP_READDIRPLUS; 715 break; 716 default: 717 nfs4_server_set_init_caps(server); 718 break; 719 } 720 } 721 EXPORT_SYMBOL_GPL(nfs_server_set_init_caps); 722 723 /* 724 * Create a version 2 or 3 client 725 */ 726 static int nfs_init_server(struct nfs_server *server, 727 const struct fs_context *fc) 728 { 729 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 730 struct rpc_timeout timeparms; 731 struct nfs_client_initdata cl_init = { 732 .hostname = ctx->nfs_server.hostname, 733 .addr = &ctx->nfs_server._address, 734 .addrlen = ctx->nfs_server.addrlen, 735 .nfs_mod = ctx->nfs_mod, 736 .proto = ctx->nfs_server.protocol, 737 .net = fc->net_ns, 738 .timeparms = &timeparms, 739 .cred = server->cred, 740 .nconnect = ctx->nfs_server.nconnect, 741 .init_flags = (1UL << NFS_CS_REUSEPORT), 742 .xprtsec = ctx->xprtsec, 743 }; 744 struct nfs_client *clp; 745 int error; 746 747 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 748 ctx->timeo, ctx->retrans); 749 if (ctx->flags & NFS_MOUNT_NORESVPORT) 750 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 751 752 if (ctx->flags & NFS_MOUNT_NETUNREACH_FATAL) 753 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags); 754 755 /* Allocate or find a client reference we can use */ 756 clp = nfs_get_client(&cl_init); 757 if (IS_ERR(clp)) 758 return PTR_ERR(clp); 759 760 server->nfs_client = clp; 761 nfs_sysfs_add_server(server); 762 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 763 764 /* Initialise the client representation from the mount data */ 765 server->flags = ctx->flags; 766 server->options = ctx->options; 767 768 switch (clp->rpc_ops->version) { 769 case 2: 770 server->fattr_valid = NFS_ATTR_FATTR_V2; 771 break; 772 case 3: 773 server->fattr_valid = NFS_ATTR_FATTR_V3; 774 break; 775 default: 776 server->fattr_valid = NFS_ATTR_FATTR_V4; 777 } 778 779 if (ctx->rsize) 780 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 781 if (ctx->wsize) 782 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 783 784 server->acregmin = ctx->acregmin * HZ; 785 server->acregmax = ctx->acregmax * HZ; 786 server->acdirmin = ctx->acdirmin * HZ; 787 server->acdirmax = ctx->acdirmax * HZ; 788 789 /* Start lockd here, before we might error out */ 790 error = nfs_start_lockd(server); 791 if (error < 0) 792 goto error; 793 794 server->port = ctx->nfs_server.port; 795 server->auth_info = ctx->auth_info; 796 797 error = nfs_init_server_rpcclient(server, &timeparms, 798 ctx->selected_flavor); 799 if (error < 0) 800 goto error; 801 802 nfs_server_set_init_caps(server); 803 804 /* Preserve the values of mount_server-related mount options */ 805 if (ctx->mount_server.addrlen) { 806 memcpy(&server->mountd_address, &ctx->mount_server.address, 807 ctx->mount_server.addrlen); 808 server->mountd_addrlen = ctx->mount_server.addrlen; 809 } 810 server->mountd_version = ctx->mount_server.version; 811 server->mountd_port = ctx->mount_server.port; 812 server->mountd_protocol = ctx->mount_server.protocol; 813 814 server->namelen = ctx->namlen; 815 return 0; 816 817 error: 818 server->nfs_client = NULL; 819 nfs_put_client(clp); 820 return error; 821 } 822 823 /* 824 * Load up the server record from information gained in an fsinfo record 825 */ 826 static void nfs_server_set_fsinfo(struct nfs_server *server, 827 struct nfs_fsinfo *fsinfo) 828 { 829 struct nfs_client *clp = server->nfs_client; 830 unsigned long max_rpc_payload, raw_max_rpc_payload; 831 832 /* Work out a lot of parameters */ 833 if (server->rsize == 0) 834 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 835 if (server->wsize == 0) 836 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 837 838 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 839 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 840 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 841 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 842 843 raw_max_rpc_payload = rpc_max_payload(server->client); 844 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 845 846 if (server->rsize > max_rpc_payload) 847 server->rsize = max_rpc_payload; 848 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 849 server->rsize = NFS_MAX_FILE_IO_SIZE; 850 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 851 852 if (server->wsize > max_rpc_payload) 853 server->wsize = max_rpc_payload; 854 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 855 server->wsize = NFS_MAX_FILE_IO_SIZE; 856 857 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 858 859 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 860 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 861 server->dtsize = NFS_MAX_FILE_IO_SIZE; 862 if (server->dtsize > server->rsize) 863 server->dtsize = server->rsize; 864 865 if (server->flags & NFS_MOUNT_NOAC) { 866 server->acregmin = server->acregmax = 0; 867 server->acdirmin = server->acdirmax = 0; 868 } 869 870 server->maxfilesize = fsinfo->maxfilesize; 871 872 server->change_attr_type = fsinfo->change_attr_type; 873 874 server->clone_blksize = fsinfo->clone_blksize; 875 /* We're airborne Set socket buffersize */ 876 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 877 878 #ifdef CONFIG_NFS_V4_2 879 /* 880 * Defaults until limited by the session parameters. 881 */ 882 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 883 XATTR_SIZE_MAX); 884 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 885 XATTR_SIZE_MAX); 886 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 887 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 888 889 if (fsinfo->xattr_support) 890 server->caps |= NFS_CAP_XATTR; 891 #endif 892 } 893 894 /* 895 * Probe filesystem information, including the FSID on v2/v3 896 */ 897 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 898 { 899 struct nfs_fsinfo fsinfo; 900 struct nfs_client *clp = server->nfs_client; 901 int error; 902 903 if (clp->rpc_ops->set_capabilities != NULL) { 904 error = clp->rpc_ops->set_capabilities(server, mntfh); 905 if (error < 0) 906 return error; 907 } 908 909 fsinfo.fattr = fattr; 910 fsinfo.nlayouttypes = 0; 911 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 912 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 913 if (error < 0) 914 return error; 915 916 nfs_server_set_fsinfo(server, &fsinfo); 917 918 /* Get some general file system info */ 919 if (server->namelen == 0) { 920 struct nfs_pathconf pathinfo; 921 922 pathinfo.fattr = fattr; 923 nfs_fattr_init(fattr); 924 925 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 926 server->namelen = pathinfo.max_namelen; 927 } 928 929 if (clp->rpc_ops->discover_trunking != NULL && 930 (server->caps & NFS_CAP_FS_LOCATIONS && 931 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 932 error = clp->rpc_ops->discover_trunking(server, mntfh); 933 if (error < 0) 934 return error; 935 } 936 937 return 0; 938 } 939 940 /* 941 * Grab the destination's particulars, including lease expiry time. 942 * 943 * Returns zero if probe succeeded and retrieved FSID matches the FSID 944 * we have cached. 945 */ 946 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 947 { 948 struct nfs_fattr *fattr; 949 int error; 950 951 fattr = nfs_alloc_fattr(); 952 if (fattr == NULL) 953 return -ENOMEM; 954 955 /* Sanity: the probe won't work if the destination server 956 * does not recognize the migrated FH. */ 957 error = nfs_probe_fsinfo(server, mntfh, fattr); 958 959 nfs_free_fattr(fattr); 960 return error; 961 } 962 EXPORT_SYMBOL_GPL(nfs_probe_server); 963 964 /* 965 * Copy useful information when duplicating a server record 966 */ 967 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 968 { 969 target->flags = source->flags; 970 target->rsize = source->rsize; 971 target->wsize = source->wsize; 972 target->acregmin = source->acregmin; 973 target->acregmax = source->acregmax; 974 target->acdirmin = source->acdirmin; 975 target->acdirmax = source->acdirmax; 976 target->options = source->options; 977 target->auth_info = source->auth_info; 978 target->port = source->port; 979 } 980 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 981 982 void nfs_server_insert_lists(struct nfs_server *server) 983 { 984 struct nfs_client *clp = server->nfs_client; 985 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 986 987 spin_lock(&nn->nfs_client_lock); 988 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 989 list_add_tail(&server->master_link, &nn->nfs_volume_list); 990 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 991 spin_unlock(&nn->nfs_client_lock); 992 993 } 994 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 995 996 void nfs_server_remove_lists(struct nfs_server *server) 997 { 998 struct nfs_client *clp = server->nfs_client; 999 struct nfs_net *nn; 1000 1001 if (clp == NULL) 1002 return; 1003 nn = net_generic(clp->cl_net, nfs_net_id); 1004 spin_lock(&nn->nfs_client_lock); 1005 list_del_rcu(&server->client_link); 1006 if (list_empty(&clp->cl_superblocks)) 1007 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1008 list_del(&server->master_link); 1009 spin_unlock(&nn->nfs_client_lock); 1010 1011 synchronize_rcu(); 1012 } 1013 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 1014 1015 static DEFINE_IDA(s_sysfs_ids); 1016 1017 /* 1018 * Allocate and initialise a server record 1019 */ 1020 struct nfs_server *nfs_alloc_server(void) 1021 { 1022 struct nfs_server *server; 1023 1024 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1025 if (!server) 1026 return NULL; 1027 1028 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 1029 if (server->s_sysfs_id < 0) { 1030 kfree(server); 1031 return NULL; 1032 } 1033 1034 server->client = server->client_acl = ERR_PTR(-EINVAL); 1035 1036 /* Zero out the NFS state stuff */ 1037 INIT_LIST_HEAD(&server->client_link); 1038 INIT_LIST_HEAD(&server->master_link); 1039 INIT_LIST_HEAD(&server->delegations); 1040 INIT_LIST_HEAD(&server->layouts); 1041 INIT_LIST_HEAD(&server->state_owners_lru); 1042 INIT_LIST_HEAD(&server->ss_copies); 1043 INIT_LIST_HEAD(&server->ss_src_copies); 1044 1045 atomic_set(&server->active, 0); 1046 atomic_long_set(&server->nr_active_delegations, 0); 1047 1048 server->io_stats = nfs_alloc_iostats(); 1049 if (!server->io_stats) { 1050 kfree(server); 1051 return NULL; 1052 } 1053 1054 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 1055 1056 init_waitqueue_head(&server->write_congestion_wait); 1057 atomic_long_set(&server->writeback, 0); 1058 1059 atomic64_set(&server->owner_ctr, 0); 1060 1061 pnfs_init_server(server); 1062 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1063 1064 return server; 1065 } 1066 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1067 1068 static void delayed_free(struct rcu_head *p) 1069 { 1070 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1071 1072 nfs_free_iostats(server->io_stats); 1073 kfree(server); 1074 } 1075 1076 /* 1077 * Free up a server record 1078 */ 1079 void nfs_free_server(struct nfs_server *server) 1080 { 1081 nfs_server_remove_lists(server); 1082 1083 if (server->destroy != NULL) 1084 server->destroy(server); 1085 1086 if (!IS_ERR(server->client_acl)) 1087 rpc_shutdown_client(server->client_acl); 1088 if (!IS_ERR(server->client)) 1089 rpc_shutdown_client(server->client); 1090 1091 nfs_put_client(server->nfs_client); 1092 1093 if (server->kobj.state_initialized) { 1094 nfs_sysfs_remove_server(server); 1095 kobject_put(&server->kobj); 1096 } 1097 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1098 1099 put_cred(server->cred); 1100 nfs_release_automount_timer(); 1101 call_rcu(&server->rcu, delayed_free); 1102 } 1103 EXPORT_SYMBOL_GPL(nfs_free_server); 1104 1105 /* 1106 * Create a version 2 or 3 volume record 1107 * - keyed on server and FSID 1108 */ 1109 struct nfs_server *nfs_create_server(struct fs_context *fc) 1110 { 1111 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1112 struct nfs_server *server; 1113 struct nfs_fattr *fattr; 1114 int error; 1115 1116 server = nfs_alloc_server(); 1117 if (!server) 1118 return ERR_PTR(-ENOMEM); 1119 1120 server->cred = get_cred(fc->cred); 1121 1122 error = -ENOMEM; 1123 fattr = nfs_alloc_fattr(); 1124 if (fattr == NULL) 1125 goto error; 1126 1127 /* Get a client representation */ 1128 error = nfs_init_server(server, fc); 1129 if (error < 0) 1130 goto error; 1131 1132 /* Probe the root fh to retrieve its FSID */ 1133 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1134 if (error < 0) 1135 goto error; 1136 if (server->nfs_client->rpc_ops->version == 3) { 1137 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1138 server->namelen = NFS3_MAXNAMLEN; 1139 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1140 server->caps |= NFS_CAP_READDIRPLUS; 1141 } else { 1142 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1143 server->namelen = NFS2_MAXNAMLEN; 1144 } 1145 /* Linux 'subtree_check' borkenness mandates this setting */ 1146 server->fh_expire_type = NFS_FH_VOL_RENAME; 1147 1148 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1149 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1150 fattr, NULL); 1151 if (error < 0) { 1152 dprintk("nfs_create_server: getattr error = %d\n", -error); 1153 goto error; 1154 } 1155 } 1156 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1157 1158 dprintk("Server FSID: %llx:%llx\n", 1159 (unsigned long long) server->fsid.major, 1160 (unsigned long long) server->fsid.minor); 1161 1162 nfs_server_insert_lists(server); 1163 server->mount_time = jiffies; 1164 nfs_free_fattr(fattr); 1165 return server; 1166 1167 error: 1168 nfs_free_fattr(fattr); 1169 nfs_free_server(server); 1170 return ERR_PTR(error); 1171 } 1172 EXPORT_SYMBOL_GPL(nfs_create_server); 1173 1174 /* 1175 * Clone an NFS2, NFS3 or NFS4 server record 1176 */ 1177 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1178 struct nfs_fh *fh, 1179 struct nfs_fattr *fattr, 1180 rpc_authflavor_t flavor) 1181 { 1182 struct nfs_server *server; 1183 int error; 1184 1185 server = nfs_alloc_server(); 1186 if (!server) 1187 return ERR_PTR(-ENOMEM); 1188 1189 server->cred = get_cred(source->cred); 1190 1191 /* Copy data from the source */ 1192 server->nfs_client = source->nfs_client; 1193 server->destroy = source->destroy; 1194 refcount_inc(&server->nfs_client->cl_count); 1195 nfs_server_copy_userdata(server, source); 1196 1197 server->fsid = fattr->fsid; 1198 1199 nfs_sysfs_add_server(server); 1200 1201 nfs_sysfs_link_rpc_client(server, 1202 server->nfs_client->cl_rpcclient, "_state"); 1203 1204 error = nfs_init_server_rpcclient(server, 1205 source->client->cl_timeout, 1206 flavor); 1207 if (error < 0) 1208 goto out_free_server; 1209 1210 nfs_server_set_init_caps(server); 1211 1212 /* probe the filesystem info for this server filesystem */ 1213 error = nfs_probe_server(server, fh); 1214 if (error < 0) 1215 goto out_free_server; 1216 1217 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1218 server->namelen = NFS4_MAXNAMLEN; 1219 1220 error = nfs_start_lockd(server); 1221 if (error < 0) 1222 goto out_free_server; 1223 1224 nfs_server_insert_lists(server); 1225 server->mount_time = jiffies; 1226 1227 return server; 1228 1229 out_free_server: 1230 nfs_free_server(server); 1231 return ERR_PTR(error); 1232 } 1233 EXPORT_SYMBOL_GPL(nfs_clone_server); 1234 1235 void nfs_clients_init(struct net *net) 1236 { 1237 struct nfs_net *nn = net_generic(net, nfs_net_id); 1238 1239 INIT_LIST_HEAD(&nn->nfs_client_list); 1240 INIT_LIST_HEAD(&nn->nfs_volume_list); 1241 #if IS_ENABLED(CONFIG_NFS_V4) 1242 idr_init(&nn->cb_ident_idr); 1243 #endif 1244 #if IS_ENABLED(CONFIG_NFS_V4_1) 1245 INIT_LIST_HEAD(&nn->nfs4_data_server_cache); 1246 spin_lock_init(&nn->nfs4_data_server_lock); 1247 #endif 1248 spin_lock_init(&nn->nfs_client_lock); 1249 nn->boot_time = ktime_get_real(); 1250 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1251 nn->rpcstats.program = &nfs_program; 1252 1253 nfs_netns_sysfs_setup(nn, net); 1254 } 1255 1256 void nfs_clients_exit(struct net *net) 1257 { 1258 struct nfs_net *nn = net_generic(net, nfs_net_id); 1259 1260 nfs_netns_sysfs_destroy(nn); 1261 nfs_cleanup_cb_ident_idr(net); 1262 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1263 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1264 #if IS_ENABLED(CONFIG_NFS_V4_1) 1265 WARN_ON_ONCE(!list_empty(&nn->nfs4_data_server_cache)); 1266 #endif 1267 } 1268 1269 #ifdef CONFIG_PROC_FS 1270 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1271 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1272 static void nfs_server_list_stop(struct seq_file *p, void *v); 1273 static int nfs_server_list_show(struct seq_file *m, void *v); 1274 1275 static const struct seq_operations nfs_server_list_ops = { 1276 .start = nfs_server_list_start, 1277 .next = nfs_server_list_next, 1278 .stop = nfs_server_list_stop, 1279 .show = nfs_server_list_show, 1280 }; 1281 1282 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1283 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1284 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1285 static int nfs_volume_list_show(struct seq_file *m, void *v); 1286 1287 static const struct seq_operations nfs_volume_list_ops = { 1288 .start = nfs_volume_list_start, 1289 .next = nfs_volume_list_next, 1290 .stop = nfs_volume_list_stop, 1291 .show = nfs_volume_list_show, 1292 }; 1293 1294 /* 1295 * set up the iterator to start reading from the server list and return the first item 1296 */ 1297 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1298 __acquires(&nn->nfs_client_lock) 1299 { 1300 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1301 1302 /* lock the list against modification */ 1303 spin_lock(&nn->nfs_client_lock); 1304 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1305 } 1306 1307 /* 1308 * move to next server 1309 */ 1310 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1311 { 1312 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1313 1314 return seq_list_next(v, &nn->nfs_client_list, pos); 1315 } 1316 1317 /* 1318 * clean up after reading from the transports list 1319 */ 1320 static void nfs_server_list_stop(struct seq_file *p, void *v) 1321 __releases(&nn->nfs_client_lock) 1322 { 1323 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1324 1325 spin_unlock(&nn->nfs_client_lock); 1326 } 1327 1328 /* 1329 * display a header line followed by a load of call lines 1330 */ 1331 static int nfs_server_list_show(struct seq_file *m, void *v) 1332 { 1333 struct nfs_client *clp; 1334 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1335 1336 /* display header on line 1 */ 1337 if (v == &nn->nfs_client_list) { 1338 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1339 return 0; 1340 } 1341 1342 /* display one transport per line on subsequent lines */ 1343 clp = list_entry(v, struct nfs_client, cl_share_link); 1344 1345 /* Check if the client is initialized */ 1346 if (clp->cl_cons_state != NFS_CS_READY) 1347 return 0; 1348 1349 rcu_read_lock(); 1350 seq_printf(m, "v%u %s %s %3d %s\n", 1351 clp->rpc_ops->version, 1352 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1353 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1354 refcount_read(&clp->cl_count), 1355 clp->cl_hostname); 1356 rcu_read_unlock(); 1357 1358 return 0; 1359 } 1360 1361 /* 1362 * set up the iterator to start reading from the volume list and return the first item 1363 */ 1364 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1365 __acquires(&nn->nfs_client_lock) 1366 { 1367 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1368 1369 /* lock the list against modification */ 1370 spin_lock(&nn->nfs_client_lock); 1371 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1372 } 1373 1374 /* 1375 * move to next volume 1376 */ 1377 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1378 { 1379 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1380 1381 return seq_list_next(v, &nn->nfs_volume_list, pos); 1382 } 1383 1384 /* 1385 * clean up after reading from the transports list 1386 */ 1387 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1388 __releases(&nn->nfs_client_lock) 1389 { 1390 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1391 1392 spin_unlock(&nn->nfs_client_lock); 1393 } 1394 1395 /* 1396 * display a header line followed by a load of call lines 1397 */ 1398 static int nfs_volume_list_show(struct seq_file *m, void *v) 1399 { 1400 struct nfs_server *server; 1401 struct nfs_client *clp; 1402 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1403 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1404 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1405 1406 /* display header on line 1 */ 1407 if (v == &nn->nfs_volume_list) { 1408 seq_puts(m, "NV SERVER PORT DEV FSID" 1409 " FSC\n"); 1410 return 0; 1411 } 1412 /* display one transport per line on subsequent lines */ 1413 server = list_entry(v, struct nfs_server, master_link); 1414 clp = server->nfs_client; 1415 1416 snprintf(dev, sizeof(dev), "%u:%u", 1417 MAJOR(server->s_dev), MINOR(server->s_dev)); 1418 1419 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1420 (unsigned long long) server->fsid.major, 1421 (unsigned long long) server->fsid.minor); 1422 1423 rcu_read_lock(); 1424 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1425 clp->rpc_ops->version, 1426 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1427 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1428 dev, 1429 fsid, 1430 nfs_server_fscache_state(server)); 1431 rcu_read_unlock(); 1432 1433 return 0; 1434 } 1435 1436 int nfs_fs_proc_net_init(struct net *net) 1437 { 1438 struct nfs_net *nn = net_generic(net, nfs_net_id); 1439 struct proc_dir_entry *p; 1440 1441 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1442 if (!nn->proc_nfsfs) 1443 goto error_0; 1444 1445 /* a file of servers with which we're dealing */ 1446 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1447 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1448 if (!p) 1449 goto error_1; 1450 1451 /* a file of volumes that we have mounted */ 1452 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1453 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1454 if (!p) 1455 goto error_1; 1456 return 0; 1457 1458 error_1: 1459 remove_proc_subtree("nfsfs", net->proc_net); 1460 error_0: 1461 return -ENOMEM; 1462 } 1463 1464 void nfs_fs_proc_net_exit(struct net *net) 1465 { 1466 remove_proc_subtree("nfsfs", net->proc_net); 1467 } 1468 1469 /* 1470 * initialise the /proc/fs/nfsfs/ directory 1471 */ 1472 int __init nfs_fs_proc_init(void) 1473 { 1474 if (!proc_mkdir("fs/nfsfs", NULL)) 1475 goto error_0; 1476 1477 /* a file of servers with which we're dealing */ 1478 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1479 goto error_1; 1480 1481 /* a file of volumes that we have mounted */ 1482 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1483 goto error_1; 1484 1485 return 0; 1486 error_1: 1487 remove_proc_subtree("fs/nfsfs", NULL); 1488 error_0: 1489 return -ENOMEM; 1490 } 1491 1492 /* 1493 * clean up the /proc/fs/nfsfs/ directory 1494 */ 1495 void nfs_fs_proc_exit(void) 1496 { 1497 remove_proc_subtree("fs/nfsfs", NULL); 1498 ida_destroy(&s_sysfs_ids); 1499 } 1500 1501 #endif /* CONFIG_PROC_FS */ 1502