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 if (clp->cl_xprtsec.policy == RPC_XPRTSEC_TLS_X509) { 342 if (clp->cl_xprtsec.cert_serial != 343 data->xprtsec.cert_serial) 344 continue; 345 if (clp->cl_xprtsec.privkey_serial != 346 data->xprtsec.privkey_serial) 347 continue; 348 } 349 350 refcount_inc(&clp->cl_count); 351 return clp; 352 } 353 return NULL; 354 } 355 356 /* 357 * Return true if @clp is done initializing, false if still working on it. 358 * 359 * Use nfs_client_init_status to check if it was successful. 360 */ 361 bool nfs_client_init_is_complete(const struct nfs_client *clp) 362 { 363 return clp->cl_cons_state <= NFS_CS_READY; 364 } 365 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 366 367 /* 368 * Return 0 if @clp was successfully initialized, -errno otherwise. 369 * 370 * This must be called *after* nfs_client_init_is_complete() returns true, 371 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 372 */ 373 int nfs_client_init_status(const struct nfs_client *clp) 374 { 375 /* called without checking nfs_client_init_is_complete */ 376 if (clp->cl_cons_state > NFS_CS_READY) { 377 WARN_ON_ONCE(1); 378 return -EINVAL; 379 } 380 return clp->cl_cons_state; 381 } 382 EXPORT_SYMBOL_GPL(nfs_client_init_status); 383 384 int nfs_wait_client_init_complete(const struct nfs_client *clp) 385 { 386 return wait_event_killable(nfs_client_active_wq, 387 nfs_client_init_is_complete(clp)); 388 } 389 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 390 391 /* 392 * Found an existing client. Make sure it's ready before returning. 393 */ 394 static struct nfs_client * 395 nfs_found_client(const struct nfs_client_initdata *cl_init, 396 struct nfs_client *clp) 397 { 398 int error; 399 400 error = nfs_wait_client_init_complete(clp); 401 if (error < 0) { 402 nfs_put_client(clp); 403 return ERR_PTR(-ERESTARTSYS); 404 } 405 406 if (clp->cl_cons_state < NFS_CS_READY) { 407 error = clp->cl_cons_state; 408 nfs_put_client(clp); 409 return ERR_PTR(error); 410 } 411 412 smp_rmb(); 413 return clp; 414 } 415 416 /* 417 * Look up a client by IP address and protocol version 418 * - creates a new record if one doesn't yet exist 419 */ 420 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 421 { 422 struct nfs_client *clp, *new = NULL; 423 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 424 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 425 426 if (cl_init->hostname == NULL) { 427 WARN_ON(1); 428 return ERR_PTR(-EINVAL); 429 } 430 431 /* see if the client already exists */ 432 do { 433 spin_lock(&nn->nfs_client_lock); 434 435 clp = nfs_match_client(cl_init); 436 if (clp) { 437 spin_unlock(&nn->nfs_client_lock); 438 if (new) 439 new->rpc_ops->free_client(new); 440 if (IS_ERR(clp)) 441 return clp; 442 return nfs_found_client(cl_init, clp); 443 } 444 if (new) { 445 list_add_tail(&new->cl_share_link, 446 &nn->nfs_client_list); 447 spin_unlock(&nn->nfs_client_lock); 448 new = rpc_ops->init_client(new, cl_init); 449 if (!IS_ERR(new)) 450 nfs_local_probe_async(new); 451 return new; 452 } 453 454 spin_unlock(&nn->nfs_client_lock); 455 456 new = rpc_ops->alloc_client(cl_init); 457 } while (!IS_ERR(new)); 458 459 return new; 460 } 461 EXPORT_SYMBOL_GPL(nfs_get_client); 462 463 /* 464 * Mark a server as ready or failed 465 */ 466 void nfs_mark_client_ready(struct nfs_client *clp, int state) 467 { 468 smp_wmb(); 469 clp->cl_cons_state = state; 470 wake_up_all(&nfs_client_active_wq); 471 } 472 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 473 474 /* 475 * Initialise the timeout values for a connection 476 */ 477 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 478 int timeo, int retrans) 479 { 480 to->to_initval = timeo * HZ / 10; 481 to->to_retries = retrans; 482 483 switch (proto) { 484 case XPRT_TRANSPORT_TCP: 485 case XPRT_TRANSPORT_TCP_TLS: 486 case XPRT_TRANSPORT_RDMA: 487 if (retrans == NFS_UNSPEC_RETRANS) 488 to->to_retries = NFS_DEF_TCP_RETRANS; 489 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 490 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 491 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 492 to->to_initval = NFS_MAX_TCP_TIMEOUT; 493 to->to_increment = to->to_initval; 494 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 495 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 496 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 497 if (to->to_maxval < to->to_initval) 498 to->to_maxval = to->to_initval; 499 to->to_exponential = 0; 500 break; 501 case XPRT_TRANSPORT_UDP: 502 if (retrans == NFS_UNSPEC_RETRANS) 503 to->to_retries = NFS_DEF_UDP_RETRANS; 504 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 505 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 506 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 507 to->to_initval = NFS_MAX_UDP_TIMEOUT; 508 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 509 to->to_exponential = 1; 510 break; 511 default: 512 BUG(); 513 } 514 } 515 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 516 517 /* 518 * Create an RPC client handle 519 */ 520 int nfs_create_rpc_client(struct nfs_client *clp, 521 const struct nfs_client_initdata *cl_init, 522 rpc_authflavor_t flavor) 523 { 524 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 525 struct rpc_clnt *clnt = NULL; 526 struct rpc_create_args args = { 527 .net = clp->cl_net, 528 .protocol = clp->cl_proto, 529 .nconnect = clp->cl_nconnect, 530 .address = (struct sockaddr *)&clp->cl_addr, 531 .addrsize = clp->cl_addrlen, 532 .timeout = cl_init->timeparms, 533 .servername = clp->cl_hostname, 534 .nodename = cl_init->nodename, 535 .program = &nfs_program, 536 .stats = &nn->rpcstats, 537 .version = clp->rpc_ops->version, 538 .authflavor = flavor, 539 .cred = cl_init->cred, 540 .xprtsec = cl_init->xprtsec, 541 .connect_timeout = cl_init->connect_timeout, 542 .reconnect_timeout = cl_init->reconnect_timeout, 543 }; 544 545 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 546 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 547 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 548 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 549 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 550 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 551 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 552 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 553 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 554 args.flags |= RPC_CLNT_CREATE_NOPING; 555 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 556 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 557 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 558 args.flags |= RPC_CLNT_CREATE_NETUNREACH_FATAL; 559 560 if (!IS_ERR(clp->cl_rpcclient)) 561 return 0; 562 563 clnt = rpc_create(&args); 564 if (IS_ERR(clnt)) { 565 dprintk("%s: cannot create RPC client. Error = %ld\n", 566 __func__, PTR_ERR(clnt)); 567 return PTR_ERR(clnt); 568 } 569 570 clnt->cl_principal = clp->cl_principal; 571 clp->cl_rpcclient = clnt; 572 clnt->cl_max_connect = clp->cl_max_connect; 573 return 0; 574 } 575 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 576 577 /* 578 * Version 2 or 3 client destruction 579 */ 580 static void nfs_destroy_server(struct nfs_server *server) 581 { 582 if (server->nlm_host) 583 nlmclnt_done(server->nlm_host); 584 } 585 586 /* 587 * Version 2 or 3 lockd setup 588 */ 589 static int nfs_start_lockd(struct nfs_server *server) 590 { 591 struct nlm_host *host; 592 struct nfs_client *clp = server->nfs_client; 593 struct nlmclnt_initdata nlm_init = { 594 .hostname = clp->cl_hostname, 595 .address = (struct sockaddr *)&clp->cl_addr, 596 .addrlen = clp->cl_addrlen, 597 .nfs_version = clp->rpc_ops->version, 598 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 599 1 : 0, 600 .net = clp->cl_net, 601 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 602 .cred = server->cred, 603 }; 604 605 if (nlm_init.nfs_version > 3) 606 return 0; 607 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 608 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 609 return 0; 610 611 switch (clp->cl_proto) { 612 default: 613 nlm_init.protocol = IPPROTO_TCP; 614 break; 615 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 616 case XPRT_TRANSPORT_UDP: 617 nlm_init.protocol = IPPROTO_UDP; 618 #endif 619 } 620 621 host = nlmclnt_init(&nlm_init); 622 if (IS_ERR(host)) 623 return PTR_ERR(host); 624 625 server->nlm_host = host; 626 server->destroy = nfs_destroy_server; 627 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 628 return 0; 629 } 630 631 /* 632 * Create a general RPC client 633 */ 634 int nfs_init_server_rpcclient(struct nfs_server *server, 635 const struct rpc_timeout *timeo, 636 rpc_authflavor_t pseudoflavour) 637 { 638 struct nfs_client *clp = server->nfs_client; 639 640 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 641 pseudoflavour); 642 if (IS_ERR(server->client)) { 643 dprintk("%s: couldn't create rpc_client!\n", __func__); 644 return PTR_ERR(server->client); 645 } 646 647 memcpy(&server->client->cl_timeout_default, 648 timeo, 649 sizeof(server->client->cl_timeout_default)); 650 server->client->cl_timeout = &server->client->cl_timeout_default; 651 server->client->cl_softrtry = 0; 652 if (server->flags & NFS_MOUNT_SOFTERR) 653 server->client->cl_softerr = 1; 654 if (server->flags & NFS_MOUNT_SOFT) 655 server->client->cl_softrtry = 1; 656 657 nfs_sysfs_link_rpc_client(server, server->client, NULL); 658 return 0; 659 } 660 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 661 662 /** 663 * nfs_init_client - Initialise an NFS2 or NFS3 client 664 * 665 * @clp: nfs_client to initialise 666 * @cl_init: Initialisation parameters 667 * 668 * Returns pointer to an NFS client, or an ERR_PTR value. 669 */ 670 struct nfs_client *nfs_init_client(struct nfs_client *clp, 671 const struct nfs_client_initdata *cl_init) 672 { 673 int error; 674 675 /* the client is already initialised */ 676 if (clp->cl_cons_state == NFS_CS_READY) 677 return clp; 678 679 /* 680 * Create a client RPC handle for doing FSSTAT with UNIX auth only 681 * - RFC 2623, sec 2.3.2 682 */ 683 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 684 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 685 if (error < 0) { 686 nfs_put_client(clp); 687 clp = ERR_PTR(error); 688 } 689 return clp; 690 } 691 EXPORT_SYMBOL_GPL(nfs_init_client); 692 693 static void nfs4_server_set_init_caps(struct nfs_server *server) 694 { 695 #if IS_ENABLED(CONFIG_NFS_V4) 696 /* Set the basic capabilities */ 697 server->caps = server->nfs_client->cl_mvops->init_caps; 698 if (server->flags & NFS_MOUNT_NORDIRPLUS) 699 server->caps &= ~NFS_CAP_READDIRPLUS; 700 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA) 701 server->caps &= ~NFS_CAP_READ_PLUS; 702 703 /* 704 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 705 * authentication. 706 */ 707 if (nfs4_disable_idmapping && 708 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 709 server->caps |= NFS_CAP_UIDGID_NOMAP; 710 #endif 711 } 712 713 void nfs_server_set_init_caps(struct nfs_server *server) 714 { 715 switch (server->nfs_client->rpc_ops->version) { 716 case 2: 717 server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 718 break; 719 case 3: 720 server->caps = NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 721 if (!(server->flags & NFS_MOUNT_NORDIRPLUS)) 722 server->caps |= NFS_CAP_READDIRPLUS; 723 break; 724 default: 725 nfs4_server_set_init_caps(server); 726 break; 727 } 728 } 729 EXPORT_SYMBOL_GPL(nfs_server_set_init_caps); 730 731 /* 732 * Create a version 2 or 3 client 733 */ 734 static int nfs_init_server(struct nfs_server *server, 735 const struct fs_context *fc) 736 { 737 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 738 struct rpc_timeout timeparms; 739 struct nfs_client_initdata cl_init = { 740 .hostname = ctx->nfs_server.hostname, 741 .addr = &ctx->nfs_server._address, 742 .addrlen = ctx->nfs_server.addrlen, 743 .nfs_mod = ctx->nfs_mod, 744 .proto = ctx->nfs_server.protocol, 745 .net = fc->net_ns, 746 .timeparms = &timeparms, 747 .cred = server->cred, 748 .nconnect = ctx->nfs_server.nconnect, 749 .init_flags = (1UL << NFS_CS_REUSEPORT), 750 .xprtsec = ctx->xprtsec, 751 }; 752 struct nfs_client *clp; 753 int error; 754 755 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 756 ctx->timeo, ctx->retrans); 757 if (ctx->flags & NFS_MOUNT_NORESVPORT) 758 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 759 760 if (ctx->flags & NFS_MOUNT_NETUNREACH_FATAL) 761 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags); 762 763 /* Allocate or find a client reference we can use */ 764 clp = nfs_get_client(&cl_init); 765 if (IS_ERR(clp)) 766 return PTR_ERR(clp); 767 768 server->nfs_client = clp; 769 nfs_sysfs_add_server(server); 770 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 771 772 /* Initialise the client representation from the mount data */ 773 server->flags = ctx->flags; 774 server->options = ctx->options; 775 776 switch (clp->rpc_ops->version) { 777 case 2: 778 server->fattr_valid = NFS_ATTR_FATTR_V2; 779 break; 780 case 3: 781 server->fattr_valid = NFS_ATTR_FATTR_V3; 782 break; 783 default: 784 server->fattr_valid = NFS_ATTR_FATTR_V4; 785 } 786 787 if (ctx->rsize) 788 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 789 if (ctx->wsize) 790 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 791 792 server->acregmin = ctx->acregmin * HZ; 793 server->acregmax = ctx->acregmax * HZ; 794 server->acdirmin = ctx->acdirmin * HZ; 795 server->acdirmax = ctx->acdirmax * HZ; 796 797 /* Start lockd here, before we might error out */ 798 error = nfs_start_lockd(server); 799 if (error < 0) 800 goto error; 801 802 server->port = ctx->nfs_server.port; 803 server->auth_info = ctx->auth_info; 804 805 error = nfs_init_server_rpcclient(server, &timeparms, 806 ctx->selected_flavor); 807 if (error < 0) 808 goto error; 809 810 nfs_server_set_init_caps(server); 811 812 /* Preserve the values of mount_server-related mount options */ 813 if (ctx->mount_server.addrlen) { 814 memcpy(&server->mountd_address, &ctx->mount_server.address, 815 ctx->mount_server.addrlen); 816 server->mountd_addrlen = ctx->mount_server.addrlen; 817 } 818 server->mountd_version = ctx->mount_server.version; 819 server->mountd_port = ctx->mount_server.port; 820 server->mountd_protocol = ctx->mount_server.protocol; 821 822 server->namelen = ctx->namlen; 823 return 0; 824 825 error: 826 server->nfs_client = NULL; 827 nfs_put_client(clp); 828 return error; 829 } 830 831 /* 832 * Load up the server record from information gained in an fsinfo record 833 */ 834 static void nfs_server_set_fsinfo(struct nfs_server *server, 835 struct nfs_fsinfo *fsinfo) 836 { 837 struct nfs_client *clp = server->nfs_client; 838 unsigned long max_rpc_payload, raw_max_rpc_payload; 839 840 /* Work out a lot of parameters */ 841 if (server->rsize == 0) 842 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 843 if (server->wsize == 0) 844 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 845 846 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 847 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 848 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 849 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 850 851 raw_max_rpc_payload = rpc_max_payload(server->client); 852 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 853 854 if (server->rsize > max_rpc_payload) 855 server->rsize = max_rpc_payload; 856 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 857 server->rsize = NFS_MAX_FILE_IO_SIZE; 858 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 859 860 if (server->wsize > max_rpc_payload) 861 server->wsize = max_rpc_payload; 862 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 863 server->wsize = NFS_MAX_FILE_IO_SIZE; 864 865 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 866 867 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 868 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 869 server->dtsize = NFS_MAX_FILE_IO_SIZE; 870 if (server->dtsize > server->rsize) 871 server->dtsize = server->rsize; 872 873 if (server->flags & NFS_MOUNT_NOAC) { 874 server->acregmin = server->acregmax = 0; 875 server->acdirmin = server->acdirmax = 0; 876 } 877 878 server->maxfilesize = fsinfo->maxfilesize; 879 880 server->change_attr_type = fsinfo->change_attr_type; 881 882 server->clone_blksize = fsinfo->clone_blksize; 883 /* We're airborne Set socket buffersize */ 884 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 885 886 #ifdef CONFIG_NFS_V4_2 887 /* 888 * Defaults until limited by the session parameters. 889 */ 890 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 891 XATTR_SIZE_MAX); 892 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 893 XATTR_SIZE_MAX); 894 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 895 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 896 897 if (fsinfo->xattr_support) 898 server->caps |= NFS_CAP_XATTR; 899 else 900 server->caps &= ~NFS_CAP_XATTR; 901 #endif 902 } 903 904 /* 905 * Probe filesystem information, including the FSID on v2/v3 906 */ 907 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 908 { 909 struct nfs_fsinfo fsinfo; 910 struct nfs_client *clp = server->nfs_client; 911 int error; 912 913 if (clp->rpc_ops->set_capabilities != NULL) { 914 error = clp->rpc_ops->set_capabilities(server, mntfh); 915 if (error < 0) 916 return error; 917 } 918 919 fsinfo.fattr = fattr; 920 fsinfo.nlayouttypes = 0; 921 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 922 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 923 if (error < 0) 924 return error; 925 926 nfs_server_set_fsinfo(server, &fsinfo); 927 928 /* Get some general file system info */ 929 if (server->namelen == 0) { 930 struct nfs_pathconf pathinfo; 931 932 pathinfo.fattr = fattr; 933 nfs_fattr_init(fattr); 934 935 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 936 server->namelen = pathinfo.max_namelen; 937 } 938 939 if (clp->rpc_ops->discover_trunking != NULL && 940 (server->caps & NFS_CAP_FS_LOCATIONS && 941 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 942 error = clp->rpc_ops->discover_trunking(server, mntfh); 943 if (error < 0) 944 return error; 945 } 946 947 return 0; 948 } 949 950 /* 951 * Grab the destination's particulars, including lease expiry time. 952 * 953 * Returns zero if probe succeeded and retrieved FSID matches the FSID 954 * we have cached. 955 */ 956 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 957 { 958 struct nfs_fattr *fattr; 959 int error; 960 961 fattr = nfs_alloc_fattr(); 962 if (fattr == NULL) 963 return -ENOMEM; 964 965 /* Sanity: the probe won't work if the destination server 966 * does not recognize the migrated FH. */ 967 error = nfs_probe_fsinfo(server, mntfh, fattr); 968 969 nfs_free_fattr(fattr); 970 return error; 971 } 972 EXPORT_SYMBOL_GPL(nfs_probe_server); 973 974 /* 975 * Copy useful information when duplicating a server record 976 */ 977 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 978 { 979 target->flags = source->flags; 980 target->rsize = source->rsize; 981 target->wsize = source->wsize; 982 target->acregmin = source->acregmin; 983 target->acregmax = source->acregmax; 984 target->acdirmin = source->acdirmin; 985 target->acdirmax = source->acdirmax; 986 target->options = source->options; 987 target->auth_info = source->auth_info; 988 target->port = source->port; 989 } 990 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 991 992 void nfs_server_insert_lists(struct nfs_server *server) 993 { 994 struct nfs_client *clp = server->nfs_client; 995 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 996 997 spin_lock(&nn->nfs_client_lock); 998 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 999 list_add_tail(&server->master_link, &nn->nfs_volume_list); 1000 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1001 spin_unlock(&nn->nfs_client_lock); 1002 1003 } 1004 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 1005 1006 void nfs_server_remove_lists(struct nfs_server *server) 1007 { 1008 struct nfs_client *clp = server->nfs_client; 1009 struct nfs_net *nn; 1010 1011 if (clp == NULL) 1012 return; 1013 nn = net_generic(clp->cl_net, nfs_net_id); 1014 spin_lock(&nn->nfs_client_lock); 1015 list_del_rcu(&server->client_link); 1016 if (list_empty(&clp->cl_superblocks)) 1017 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1018 list_del(&server->master_link); 1019 spin_unlock(&nn->nfs_client_lock); 1020 1021 synchronize_rcu(); 1022 } 1023 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 1024 1025 static DEFINE_IDA(s_sysfs_ids); 1026 1027 /* 1028 * Allocate and initialise a server record 1029 */ 1030 struct nfs_server *nfs_alloc_server(void) 1031 { 1032 struct nfs_server *server; 1033 1034 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1035 if (!server) 1036 return NULL; 1037 1038 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 1039 if (server->s_sysfs_id < 0) { 1040 kfree(server); 1041 return NULL; 1042 } 1043 1044 server->client = server->client_acl = ERR_PTR(-EINVAL); 1045 1046 /* Zero out the NFS state stuff */ 1047 INIT_LIST_HEAD(&server->client_link); 1048 INIT_LIST_HEAD(&server->master_link); 1049 INIT_LIST_HEAD(&server->delegations); 1050 INIT_LIST_HEAD(&server->layouts); 1051 INIT_LIST_HEAD(&server->state_owners_lru); 1052 INIT_LIST_HEAD(&server->ss_copies); 1053 INIT_LIST_HEAD(&server->ss_src_copies); 1054 1055 atomic_set(&server->active, 0); 1056 atomic_long_set(&server->nr_active_delegations, 0); 1057 1058 server->io_stats = nfs_alloc_iostats(); 1059 if (!server->io_stats) { 1060 kfree(server); 1061 return NULL; 1062 } 1063 1064 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 1065 1066 init_waitqueue_head(&server->write_congestion_wait); 1067 atomic_long_set(&server->writeback, 0); 1068 1069 atomic64_set(&server->owner_ctr, 0); 1070 1071 pnfs_init_server(server); 1072 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1073 1074 return server; 1075 } 1076 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1077 1078 static void delayed_free(struct rcu_head *p) 1079 { 1080 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1081 1082 nfs_free_iostats(server->io_stats); 1083 kfree(server); 1084 } 1085 1086 /* 1087 * Free up a server record 1088 */ 1089 void nfs_free_server(struct nfs_server *server) 1090 { 1091 nfs_server_remove_lists(server); 1092 1093 if (server->destroy != NULL) 1094 server->destroy(server); 1095 1096 if (!IS_ERR(server->client_acl)) 1097 rpc_shutdown_client(server->client_acl); 1098 if (!IS_ERR(server->client)) 1099 rpc_shutdown_client(server->client); 1100 1101 nfs_put_client(server->nfs_client); 1102 1103 if (server->kobj.state_initialized) { 1104 nfs_sysfs_remove_server(server); 1105 kobject_put(&server->kobj); 1106 } 1107 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1108 1109 put_cred(server->cred); 1110 nfs_release_automount_timer(); 1111 call_rcu(&server->rcu, delayed_free); 1112 } 1113 EXPORT_SYMBOL_GPL(nfs_free_server); 1114 1115 /* 1116 * Create a version 2 or 3 volume record 1117 * - keyed on server and FSID 1118 */ 1119 struct nfs_server *nfs_create_server(struct fs_context *fc) 1120 { 1121 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1122 struct nfs_server *server; 1123 struct nfs_fattr *fattr; 1124 int error; 1125 1126 server = nfs_alloc_server(); 1127 if (!server) 1128 return ERR_PTR(-ENOMEM); 1129 1130 server->cred = get_cred(fc->cred); 1131 1132 error = -ENOMEM; 1133 fattr = nfs_alloc_fattr(); 1134 if (fattr == NULL) 1135 goto error; 1136 1137 /* Get a client representation */ 1138 error = nfs_init_server(server, fc); 1139 if (error < 0) 1140 goto error; 1141 1142 /* Probe the root fh to retrieve its FSID */ 1143 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1144 if (error < 0) 1145 goto error; 1146 if (server->nfs_client->rpc_ops->version == 3) { 1147 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1148 server->namelen = NFS3_MAXNAMLEN; 1149 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1150 server->caps |= NFS_CAP_READDIRPLUS; 1151 } else { 1152 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1153 server->namelen = NFS2_MAXNAMLEN; 1154 } 1155 /* Linux 'subtree_check' borkenness mandates this setting */ 1156 server->fh_expire_type = NFS_FH_VOL_RENAME; 1157 1158 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1159 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1160 fattr, NULL); 1161 if (error < 0) { 1162 dprintk("nfs_create_server: getattr error = %d\n", -error); 1163 goto error; 1164 } 1165 } 1166 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1167 1168 dprintk("Server FSID: %llx:%llx\n", 1169 (unsigned long long) server->fsid.major, 1170 (unsigned long long) server->fsid.minor); 1171 1172 nfs_server_insert_lists(server); 1173 server->mount_time = jiffies; 1174 nfs_free_fattr(fattr); 1175 return server; 1176 1177 error: 1178 nfs_free_fattr(fattr); 1179 nfs_free_server(server); 1180 return ERR_PTR(error); 1181 } 1182 EXPORT_SYMBOL_GPL(nfs_create_server); 1183 1184 /* 1185 * Clone an NFS2, NFS3 or NFS4 server record 1186 */ 1187 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1188 struct nfs_fh *fh, 1189 struct nfs_fattr *fattr, 1190 rpc_authflavor_t flavor) 1191 { 1192 struct nfs_server *server; 1193 int error; 1194 1195 server = nfs_alloc_server(); 1196 if (!server) 1197 return ERR_PTR(-ENOMEM); 1198 1199 server->cred = get_cred(source->cred); 1200 1201 /* Copy data from the source */ 1202 server->nfs_client = source->nfs_client; 1203 server->destroy = source->destroy; 1204 refcount_inc(&server->nfs_client->cl_count); 1205 nfs_server_copy_userdata(server, source); 1206 1207 server->fsid = fattr->fsid; 1208 1209 nfs_sysfs_add_server(server); 1210 1211 nfs_sysfs_link_rpc_client(server, 1212 server->nfs_client->cl_rpcclient, "_state"); 1213 1214 error = nfs_init_server_rpcclient(server, 1215 source->client->cl_timeout, 1216 flavor); 1217 if (error < 0) 1218 goto out_free_server; 1219 1220 nfs_server_set_init_caps(server); 1221 1222 /* probe the filesystem info for this server filesystem */ 1223 error = nfs_probe_server(server, fh); 1224 if (error < 0) 1225 goto out_free_server; 1226 1227 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1228 server->namelen = NFS4_MAXNAMLEN; 1229 1230 error = nfs_start_lockd(server); 1231 if (error < 0) 1232 goto out_free_server; 1233 1234 nfs_server_insert_lists(server); 1235 server->mount_time = jiffies; 1236 1237 return server; 1238 1239 out_free_server: 1240 nfs_free_server(server); 1241 return ERR_PTR(error); 1242 } 1243 EXPORT_SYMBOL_GPL(nfs_clone_server); 1244 1245 void nfs_clients_init(struct net *net) 1246 { 1247 struct nfs_net *nn = net_generic(net, nfs_net_id); 1248 1249 INIT_LIST_HEAD(&nn->nfs_client_list); 1250 INIT_LIST_HEAD(&nn->nfs_volume_list); 1251 #if IS_ENABLED(CONFIG_NFS_V4) 1252 idr_init(&nn->cb_ident_idr); 1253 #endif 1254 #if IS_ENABLED(CONFIG_NFS_V4_1) 1255 INIT_LIST_HEAD(&nn->nfs4_data_server_cache); 1256 spin_lock_init(&nn->nfs4_data_server_lock); 1257 #endif 1258 spin_lock_init(&nn->nfs_client_lock); 1259 nn->boot_time = ktime_get_real(); 1260 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1261 nn->rpcstats.program = &nfs_program; 1262 1263 nfs_netns_sysfs_setup(nn, net); 1264 } 1265 1266 void nfs_clients_exit(struct net *net) 1267 { 1268 struct nfs_net *nn = net_generic(net, nfs_net_id); 1269 1270 nfs_netns_sysfs_destroy(nn); 1271 nfs_cleanup_cb_ident_idr(net); 1272 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1273 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1274 #if IS_ENABLED(CONFIG_NFS_V4_1) 1275 WARN_ON_ONCE(!list_empty(&nn->nfs4_data_server_cache)); 1276 #endif 1277 } 1278 1279 #ifdef CONFIG_PROC_FS 1280 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1281 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1282 static void nfs_server_list_stop(struct seq_file *p, void *v); 1283 static int nfs_server_list_show(struct seq_file *m, void *v); 1284 1285 static const struct seq_operations nfs_server_list_ops = { 1286 .start = nfs_server_list_start, 1287 .next = nfs_server_list_next, 1288 .stop = nfs_server_list_stop, 1289 .show = nfs_server_list_show, 1290 }; 1291 1292 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1293 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1294 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1295 static int nfs_volume_list_show(struct seq_file *m, void *v); 1296 1297 static const struct seq_operations nfs_volume_list_ops = { 1298 .start = nfs_volume_list_start, 1299 .next = nfs_volume_list_next, 1300 .stop = nfs_volume_list_stop, 1301 .show = nfs_volume_list_show, 1302 }; 1303 1304 /* 1305 * set up the iterator to start reading from the server list and return the first item 1306 */ 1307 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1308 __acquires(&nn->nfs_client_lock) 1309 { 1310 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1311 1312 /* lock the list against modification */ 1313 spin_lock(&nn->nfs_client_lock); 1314 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1315 } 1316 1317 /* 1318 * move to next server 1319 */ 1320 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1321 { 1322 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1323 1324 return seq_list_next(v, &nn->nfs_client_list, pos); 1325 } 1326 1327 /* 1328 * clean up after reading from the transports list 1329 */ 1330 static void nfs_server_list_stop(struct seq_file *p, void *v) 1331 __releases(&nn->nfs_client_lock) 1332 { 1333 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1334 1335 spin_unlock(&nn->nfs_client_lock); 1336 } 1337 1338 /* 1339 * display a header line followed by a load of call lines 1340 */ 1341 static int nfs_server_list_show(struct seq_file *m, void *v) 1342 { 1343 struct nfs_client *clp; 1344 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1345 1346 /* display header on line 1 */ 1347 if (v == &nn->nfs_client_list) { 1348 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1349 return 0; 1350 } 1351 1352 /* display one transport per line on subsequent lines */ 1353 clp = list_entry(v, struct nfs_client, cl_share_link); 1354 1355 /* Check if the client is initialized */ 1356 if (clp->cl_cons_state != NFS_CS_READY) 1357 return 0; 1358 1359 rcu_read_lock(); 1360 seq_printf(m, "v%u %s %s %3d %s\n", 1361 clp->rpc_ops->version, 1362 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1363 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1364 refcount_read(&clp->cl_count), 1365 clp->cl_hostname); 1366 rcu_read_unlock(); 1367 1368 return 0; 1369 } 1370 1371 /* 1372 * set up the iterator to start reading from the volume list and return the first item 1373 */ 1374 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1375 __acquires(&nn->nfs_client_lock) 1376 { 1377 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1378 1379 /* lock the list against modification */ 1380 spin_lock(&nn->nfs_client_lock); 1381 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1382 } 1383 1384 /* 1385 * move to next volume 1386 */ 1387 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1388 { 1389 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1390 1391 return seq_list_next(v, &nn->nfs_volume_list, pos); 1392 } 1393 1394 /* 1395 * clean up after reading from the transports list 1396 */ 1397 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1398 __releases(&nn->nfs_client_lock) 1399 { 1400 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1401 1402 spin_unlock(&nn->nfs_client_lock); 1403 } 1404 1405 /* 1406 * display a header line followed by a load of call lines 1407 */ 1408 static int nfs_volume_list_show(struct seq_file *m, void *v) 1409 { 1410 struct nfs_server *server; 1411 struct nfs_client *clp; 1412 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1413 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1414 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1415 1416 /* display header on line 1 */ 1417 if (v == &nn->nfs_volume_list) { 1418 seq_puts(m, "NV SERVER PORT DEV FSID" 1419 " FSC\n"); 1420 return 0; 1421 } 1422 /* display one transport per line on subsequent lines */ 1423 server = list_entry(v, struct nfs_server, master_link); 1424 clp = server->nfs_client; 1425 1426 snprintf(dev, sizeof(dev), "%u:%u", 1427 MAJOR(server->s_dev), MINOR(server->s_dev)); 1428 1429 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1430 (unsigned long long) server->fsid.major, 1431 (unsigned long long) server->fsid.minor); 1432 1433 rcu_read_lock(); 1434 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1435 clp->rpc_ops->version, 1436 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1437 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1438 dev, 1439 fsid, 1440 nfs_server_fscache_state(server)); 1441 rcu_read_unlock(); 1442 1443 return 0; 1444 } 1445 1446 int nfs_fs_proc_net_init(struct net *net) 1447 { 1448 struct nfs_net *nn = net_generic(net, nfs_net_id); 1449 struct proc_dir_entry *p; 1450 1451 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1452 if (!nn->proc_nfsfs) 1453 goto error_0; 1454 1455 /* a file of servers with which we're dealing */ 1456 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1457 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1458 if (!p) 1459 goto error_1; 1460 1461 /* a file of volumes that we have mounted */ 1462 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1463 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1464 if (!p) 1465 goto error_1; 1466 return 0; 1467 1468 error_1: 1469 remove_proc_subtree("nfsfs", net->proc_net); 1470 error_0: 1471 return -ENOMEM; 1472 } 1473 1474 void nfs_fs_proc_net_exit(struct net *net) 1475 { 1476 remove_proc_subtree("nfsfs", net->proc_net); 1477 } 1478 1479 /* 1480 * initialise the /proc/fs/nfsfs/ directory 1481 */ 1482 int __init nfs_fs_proc_init(void) 1483 { 1484 if (!proc_mkdir("fs/nfsfs", NULL)) 1485 goto error_0; 1486 1487 /* a file of servers with which we're dealing */ 1488 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1489 goto error_1; 1490 1491 /* a file of volumes that we have mounted */ 1492 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1493 goto error_1; 1494 1495 return 0; 1496 error_1: 1497 remove_proc_subtree("fs/nfsfs", NULL); 1498 error_0: 1499 return -ENOMEM; 1500 } 1501 1502 /* 1503 * clean up the /proc/fs/nfsfs/ directory 1504 */ 1505 void nfs_fs_proc_exit(void) 1506 { 1507 remove_proc_subtree("fs/nfsfs", NULL); 1508 ida_destroy(&s_sysfs_ids); 1509 } 1510 1511 #endif /* CONFIG_PROC_FS */ 1512