1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* client.c: NFS client sharing and management code 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/sched.h> 12 #include <linux/time.h> 13 #include <linux/kernel.h> 14 #include <linux/mm.h> 15 #include <linux/string.h> 16 #include <linux/stat.h> 17 #include <linux/errno.h> 18 #include <linux/unistd.h> 19 #include <linux/sunrpc/addr.h> 20 #include <linux/sunrpc/clnt.h> 21 #include <linux/sunrpc/stats.h> 22 #include <linux/sunrpc/metrics.h> 23 #include <linux/sunrpc/xprtsock.h> 24 #include <linux/sunrpc/xprtrdma.h> 25 #include <linux/nfs_fs.h> 26 #include <linux/nfs_mount.h> 27 #include <linux/nfs4_mount.h> 28 #include <linux/lockd/bind.h> 29 #include <linux/seq_file.h> 30 #include <linux/mount.h> 31 #include <linux/vfs.h> 32 #include <linux/inet.h> 33 #include <linux/in6.h> 34 #include <linux/slab.h> 35 #include <linux/idr.h> 36 #include <net/ipv6.h> 37 #include <linux/nfs_xdr.h> 38 #include <linux/sunrpc/bc_xprt.h> 39 #include <linux/nsproxy.h> 40 #include <linux/pid_namespace.h> 41 42 43 #include "nfs4_fs.h" 44 #include "callback.h" 45 #include "delegation.h" 46 #include "iostat.h" 47 #include "internal.h" 48 #include "fscache.h" 49 #include "pnfs.h" 50 #include "nfs.h" 51 #include "netns.h" 52 #include "sysfs.h" 53 #include "nfs42.h" 54 55 #define NFSDBG_FACILITY NFSDBG_CLIENT 56 57 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58 static DEFINE_SPINLOCK(nfs_version_lock); 59 static DEFINE_MUTEX(nfs_version_mutex); 60 static LIST_HEAD(nfs_versions); 61 62 /* 63 * RPC cruft for NFS 64 */ 65 static const struct rpc_version *nfs_version[5] = { 66 [2] = NULL, 67 [3] = NULL, 68 [4] = NULL, 69 }; 70 71 const struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .pipe_dir_name = NFS_PIPE_DIRNAME, 77 }; 78 79 static struct nfs_subversion *find_nfs_version(unsigned int version) 80 { 81 struct nfs_subversion *nfs; 82 spin_lock(&nfs_version_lock); 83 84 list_for_each_entry(nfs, &nfs_versions, list) { 85 if (nfs->rpc_ops->version == version) { 86 spin_unlock(&nfs_version_lock); 87 return nfs; 88 } 89 } 90 91 spin_unlock(&nfs_version_lock); 92 return ERR_PTR(-EPROTONOSUPPORT); 93 } 94 95 struct nfs_subversion *get_nfs_version(unsigned int version) 96 { 97 struct nfs_subversion *nfs = find_nfs_version(version); 98 99 if (IS_ERR(nfs)) { 100 mutex_lock(&nfs_version_mutex); 101 request_module("nfsv%d", version); 102 nfs = find_nfs_version(version); 103 mutex_unlock(&nfs_version_mutex); 104 } 105 106 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 107 return ERR_PTR(-EAGAIN); 108 return nfs; 109 } 110 111 void put_nfs_version(struct nfs_subversion *nfs) 112 { 113 module_put(nfs->owner); 114 } 115 116 void register_nfs_version(struct nfs_subversion *nfs) 117 { 118 spin_lock(&nfs_version_lock); 119 120 list_add(&nfs->list, &nfs_versions); 121 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 122 123 spin_unlock(&nfs_version_lock); 124 } 125 EXPORT_SYMBOL_GPL(register_nfs_version); 126 127 void unregister_nfs_version(struct nfs_subversion *nfs) 128 { 129 spin_lock(&nfs_version_lock); 130 131 nfs_version[nfs->rpc_ops->version] = NULL; 132 list_del(&nfs->list); 133 134 spin_unlock(&nfs_version_lock); 135 } 136 EXPORT_SYMBOL_GPL(unregister_nfs_version); 137 138 /* 139 * Allocate a shared client record 140 * 141 * Since these are allocated/deallocated very rarely, we don't 142 * bother putting them in a slab cache... 143 */ 144 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 145 { 146 struct nfs_client *clp; 147 int err = -ENOMEM; 148 149 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 150 goto error_0; 151 152 clp->cl_minorversion = cl_init->minorversion; 153 clp->cl_nfs_mod = cl_init->nfs_mod; 154 if (!try_module_get(clp->cl_nfs_mod->owner)) 155 goto error_dealloc; 156 157 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 158 159 refcount_set(&clp->cl_count, 1); 160 clp->cl_cons_state = NFS_CS_INITING; 161 162 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 163 clp->cl_addrlen = cl_init->addrlen; 164 165 if (cl_init->hostname) { 166 err = -ENOMEM; 167 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 168 if (!clp->cl_hostname) 169 goto error_cleanup; 170 } 171 172 INIT_LIST_HEAD(&clp->cl_superblocks); 173 clp->cl_rpcclient = ERR_PTR(-EINVAL); 174 175 clp->cl_flags = cl_init->init_flags; 176 clp->cl_proto = cl_init->proto; 177 clp->cl_nconnect = cl_init->nconnect; 178 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; 179 clp->cl_net = get_net(cl_init->net); 180 181 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 182 seqlock_init(&clp->cl_boot_lock); 183 ktime_get_real_ts64(&clp->cl_nfssvc_boot); 184 nfs_uuid_init(&clp->cl_uuid); 185 spin_lock_init(&clp->cl_localio_lock); 186 #endif /* CONFIG_NFS_LOCALIO */ 187 188 clp->cl_principal = "*"; 189 clp->cl_xprtsec = cl_init->xprtsec; 190 return clp; 191 192 error_cleanup: 193 put_nfs_version(clp->cl_nfs_mod); 194 error_dealloc: 195 kfree(clp); 196 error_0: 197 return ERR_PTR(err); 198 } 199 EXPORT_SYMBOL_GPL(nfs_alloc_client); 200 201 #if IS_ENABLED(CONFIG_NFS_V4) 202 static void nfs_cleanup_cb_ident_idr(struct net *net) 203 { 204 struct nfs_net *nn = net_generic(net, nfs_net_id); 205 206 idr_destroy(&nn->cb_ident_idr); 207 } 208 209 /* nfs_client_lock held */ 210 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 211 { 212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 213 214 if (clp->cl_cb_ident) 215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 216 } 217 218 static void pnfs_init_server(struct nfs_server *server) 219 { 220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 221 } 222 223 #else 224 static void nfs_cleanup_cb_ident_idr(struct net *net) 225 { 226 } 227 228 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 229 { 230 } 231 232 static void pnfs_init_server(struct nfs_server *server) 233 { 234 } 235 236 #endif /* CONFIG_NFS_V4 */ 237 238 /* 239 * Destroy a shared client record 240 */ 241 void nfs_free_client(struct nfs_client *clp) 242 { 243 nfs_local_disable(clp); 244 245 /* -EIO all pending I/O */ 246 if (!IS_ERR(clp->cl_rpcclient)) 247 rpc_shutdown_client(clp->cl_rpcclient); 248 249 put_net(clp->cl_net); 250 put_nfs_version(clp->cl_nfs_mod); 251 kfree(clp->cl_hostname); 252 kfree(clp->cl_acceptor); 253 kfree_rcu(clp, rcu); 254 } 255 EXPORT_SYMBOL_GPL(nfs_free_client); 256 257 /* 258 * Release a reference to a shared client record 259 */ 260 void nfs_put_client(struct nfs_client *clp) 261 { 262 struct nfs_net *nn; 263 264 if (!clp) 265 return; 266 267 nn = net_generic(clp->cl_net, nfs_net_id); 268 269 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 270 list_del(&clp->cl_share_link); 271 nfs_cb_idr_remove_locked(clp); 272 spin_unlock(&nn->nfs_client_lock); 273 274 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 275 276 clp->rpc_ops->free_client(clp); 277 } 278 } 279 EXPORT_SYMBOL_GPL(nfs_put_client); 280 281 /* 282 * Find an nfs_client on the list that matches the initialisation data 283 * that is supplied. 284 */ 285 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 286 { 287 struct nfs_client *clp; 288 const struct sockaddr *sap = (struct sockaddr *)data->addr; 289 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 290 int error; 291 292 again: 293 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 294 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 295 /* Don't match clients that failed to initialise properly */ 296 if (clp->cl_cons_state < 0) 297 continue; 298 299 /* If a client is still initializing then we need to wait */ 300 if (clp->cl_cons_state > NFS_CS_READY) { 301 refcount_inc(&clp->cl_count); 302 spin_unlock(&nn->nfs_client_lock); 303 error = nfs_wait_client_init_complete(clp); 304 nfs_put_client(clp); 305 spin_lock(&nn->nfs_client_lock); 306 if (error < 0) 307 return ERR_PTR(error); 308 goto again; 309 } 310 311 /* Different NFS versions cannot share the same nfs_client */ 312 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 313 continue; 314 315 if (clp->cl_proto != data->proto) 316 continue; 317 /* Match nfsv4 minorversion */ 318 if (clp->cl_minorversion != data->minorversion) 319 continue; 320 321 /* Match request for a dedicated DS */ 322 if (test_bit(NFS_CS_DS, &data->init_flags) != 323 test_bit(NFS_CS_DS, &clp->cl_flags)) 324 continue; 325 326 /* Match the full socket address */ 327 if (!rpc_cmp_addr_port(sap, clap)) 328 /* Match all xprt_switch full socket addresses */ 329 if (IS_ERR(clp->cl_rpcclient) || 330 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 331 sap)) 332 continue; 333 334 /* Match the xprt security policy */ 335 if (clp->cl_xprtsec.policy != data->xprtsec.policy) 336 continue; 337 338 refcount_inc(&clp->cl_count); 339 return clp; 340 } 341 return NULL; 342 } 343 344 /* 345 * Return true if @clp is done initializing, false if still working on it. 346 * 347 * Use nfs_client_init_status to check if it was successful. 348 */ 349 bool nfs_client_init_is_complete(const struct nfs_client *clp) 350 { 351 return clp->cl_cons_state <= NFS_CS_READY; 352 } 353 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 354 355 /* 356 * Return 0 if @clp was successfully initialized, -errno otherwise. 357 * 358 * This must be called *after* nfs_client_init_is_complete() returns true, 359 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 360 */ 361 int nfs_client_init_status(const struct nfs_client *clp) 362 { 363 /* called without checking nfs_client_init_is_complete */ 364 if (clp->cl_cons_state > NFS_CS_READY) { 365 WARN_ON_ONCE(1); 366 return -EINVAL; 367 } 368 return clp->cl_cons_state; 369 } 370 EXPORT_SYMBOL_GPL(nfs_client_init_status); 371 372 int nfs_wait_client_init_complete(const struct nfs_client *clp) 373 { 374 return wait_event_killable(nfs_client_active_wq, 375 nfs_client_init_is_complete(clp)); 376 } 377 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 378 379 /* 380 * Found an existing client. Make sure it's ready before returning. 381 */ 382 static struct nfs_client * 383 nfs_found_client(const struct nfs_client_initdata *cl_init, 384 struct nfs_client *clp) 385 { 386 int error; 387 388 error = nfs_wait_client_init_complete(clp); 389 if (error < 0) { 390 nfs_put_client(clp); 391 return ERR_PTR(-ERESTARTSYS); 392 } 393 394 if (clp->cl_cons_state < NFS_CS_READY) { 395 error = clp->cl_cons_state; 396 nfs_put_client(clp); 397 return ERR_PTR(error); 398 } 399 400 smp_rmb(); 401 return clp; 402 } 403 404 /* 405 * Look up a client by IP address and protocol version 406 * - creates a new record if one doesn't yet exist 407 */ 408 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 409 { 410 struct nfs_client *clp, *new = NULL; 411 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 412 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 413 414 if (cl_init->hostname == NULL) { 415 WARN_ON(1); 416 return ERR_PTR(-EINVAL); 417 } 418 419 /* see if the client already exists */ 420 do { 421 spin_lock(&nn->nfs_client_lock); 422 423 clp = nfs_match_client(cl_init); 424 if (clp) { 425 spin_unlock(&nn->nfs_client_lock); 426 if (new) 427 new->rpc_ops->free_client(new); 428 if (IS_ERR(clp)) 429 return clp; 430 return nfs_found_client(cl_init, clp); 431 } 432 if (new) { 433 list_add_tail(&new->cl_share_link, 434 &nn->nfs_client_list); 435 spin_unlock(&nn->nfs_client_lock); 436 new = rpc_ops->init_client(new, cl_init); 437 if (!IS_ERR(new)) 438 nfs_local_probe(new); 439 return new; 440 } 441 442 spin_unlock(&nn->nfs_client_lock); 443 444 new = rpc_ops->alloc_client(cl_init); 445 } while (!IS_ERR(new)); 446 447 return new; 448 } 449 EXPORT_SYMBOL_GPL(nfs_get_client); 450 451 /* 452 * Mark a server as ready or failed 453 */ 454 void nfs_mark_client_ready(struct nfs_client *clp, int state) 455 { 456 smp_wmb(); 457 clp->cl_cons_state = state; 458 wake_up_all(&nfs_client_active_wq); 459 } 460 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 461 462 /* 463 * Initialise the timeout values for a connection 464 */ 465 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 466 int timeo, int retrans) 467 { 468 to->to_initval = timeo * HZ / 10; 469 to->to_retries = retrans; 470 471 switch (proto) { 472 case XPRT_TRANSPORT_TCP: 473 case XPRT_TRANSPORT_TCP_TLS: 474 case XPRT_TRANSPORT_RDMA: 475 if (retrans == NFS_UNSPEC_RETRANS) 476 to->to_retries = NFS_DEF_TCP_RETRANS; 477 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 478 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 479 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 480 to->to_initval = NFS_MAX_TCP_TIMEOUT; 481 to->to_increment = to->to_initval; 482 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 483 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 484 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 485 if (to->to_maxval < to->to_initval) 486 to->to_maxval = to->to_initval; 487 to->to_exponential = 0; 488 break; 489 case XPRT_TRANSPORT_UDP: 490 if (retrans == NFS_UNSPEC_RETRANS) 491 to->to_retries = NFS_DEF_UDP_RETRANS; 492 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 493 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 494 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 495 to->to_initval = NFS_MAX_UDP_TIMEOUT; 496 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 497 to->to_exponential = 1; 498 break; 499 default: 500 BUG(); 501 } 502 } 503 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 504 505 /* 506 * Create an RPC client handle 507 */ 508 int nfs_create_rpc_client(struct nfs_client *clp, 509 const struct nfs_client_initdata *cl_init, 510 rpc_authflavor_t flavor) 511 { 512 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 513 struct rpc_clnt *clnt = NULL; 514 struct rpc_create_args args = { 515 .net = clp->cl_net, 516 .protocol = clp->cl_proto, 517 .nconnect = clp->cl_nconnect, 518 .address = (struct sockaddr *)&clp->cl_addr, 519 .addrsize = clp->cl_addrlen, 520 .timeout = cl_init->timeparms, 521 .servername = clp->cl_hostname, 522 .nodename = cl_init->nodename, 523 .program = &nfs_program, 524 .stats = &nn->rpcstats, 525 .version = clp->rpc_ops->version, 526 .authflavor = flavor, 527 .cred = cl_init->cred, 528 .xprtsec = cl_init->xprtsec, 529 .connect_timeout = cl_init->connect_timeout, 530 .reconnect_timeout = cl_init->reconnect_timeout, 531 }; 532 533 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 534 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 535 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 536 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 537 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 538 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 539 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 540 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 541 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 542 args.flags |= RPC_CLNT_CREATE_NOPING; 543 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 544 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 545 546 if (!IS_ERR(clp->cl_rpcclient)) 547 return 0; 548 549 clnt = rpc_create(&args); 550 if (IS_ERR(clnt)) { 551 dprintk("%s: cannot create RPC client. Error = %ld\n", 552 __func__, PTR_ERR(clnt)); 553 return PTR_ERR(clnt); 554 } 555 556 clnt->cl_principal = clp->cl_principal; 557 clp->cl_rpcclient = clnt; 558 clnt->cl_max_connect = clp->cl_max_connect; 559 return 0; 560 } 561 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 562 563 /* 564 * Version 2 or 3 client destruction 565 */ 566 static void nfs_destroy_server(struct nfs_server *server) 567 { 568 if (server->nlm_host) 569 nlmclnt_done(server->nlm_host); 570 } 571 572 /* 573 * Version 2 or 3 lockd setup 574 */ 575 static int nfs_start_lockd(struct nfs_server *server) 576 { 577 struct nlm_host *host; 578 struct nfs_client *clp = server->nfs_client; 579 struct nlmclnt_initdata nlm_init = { 580 .hostname = clp->cl_hostname, 581 .address = (struct sockaddr *)&clp->cl_addr, 582 .addrlen = clp->cl_addrlen, 583 .nfs_version = clp->rpc_ops->version, 584 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 585 1 : 0, 586 .net = clp->cl_net, 587 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 588 .cred = server->cred, 589 }; 590 591 if (nlm_init.nfs_version > 3) 592 return 0; 593 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 594 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 595 return 0; 596 597 switch (clp->cl_proto) { 598 default: 599 nlm_init.protocol = IPPROTO_TCP; 600 break; 601 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 602 case XPRT_TRANSPORT_UDP: 603 nlm_init.protocol = IPPROTO_UDP; 604 #endif 605 } 606 607 host = nlmclnt_init(&nlm_init); 608 if (IS_ERR(host)) 609 return PTR_ERR(host); 610 611 server->nlm_host = host; 612 server->destroy = nfs_destroy_server; 613 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 614 return 0; 615 } 616 617 /* 618 * Create a general RPC client 619 */ 620 int nfs_init_server_rpcclient(struct nfs_server *server, 621 const struct rpc_timeout *timeo, 622 rpc_authflavor_t pseudoflavour) 623 { 624 struct nfs_client *clp = server->nfs_client; 625 626 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 627 pseudoflavour); 628 if (IS_ERR(server->client)) { 629 dprintk("%s: couldn't create rpc_client!\n", __func__); 630 return PTR_ERR(server->client); 631 } 632 633 memcpy(&server->client->cl_timeout_default, 634 timeo, 635 sizeof(server->client->cl_timeout_default)); 636 server->client->cl_timeout = &server->client->cl_timeout_default; 637 server->client->cl_softrtry = 0; 638 if (server->flags & NFS_MOUNT_SOFTERR) 639 server->client->cl_softerr = 1; 640 if (server->flags & NFS_MOUNT_SOFT) 641 server->client->cl_softrtry = 1; 642 643 nfs_sysfs_link_rpc_client(server, server->client, NULL); 644 return 0; 645 } 646 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 647 648 /** 649 * nfs_init_client - Initialise an NFS2 or NFS3 client 650 * 651 * @clp: nfs_client to initialise 652 * @cl_init: Initialisation parameters 653 * 654 * Returns pointer to an NFS client, or an ERR_PTR value. 655 */ 656 struct nfs_client *nfs_init_client(struct nfs_client *clp, 657 const struct nfs_client_initdata *cl_init) 658 { 659 int error; 660 661 /* the client is already initialised */ 662 if (clp->cl_cons_state == NFS_CS_READY) 663 return clp; 664 665 /* 666 * Create a client RPC handle for doing FSSTAT with UNIX auth only 667 * - RFC 2623, sec 2.3.2 668 */ 669 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 670 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 671 if (error < 0) { 672 nfs_put_client(clp); 673 clp = ERR_PTR(error); 674 } 675 return clp; 676 } 677 EXPORT_SYMBOL_GPL(nfs_init_client); 678 679 /* 680 * Create a version 2 or 3 client 681 */ 682 static int nfs_init_server(struct nfs_server *server, 683 const struct fs_context *fc) 684 { 685 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 686 struct rpc_timeout timeparms; 687 struct nfs_client_initdata cl_init = { 688 .hostname = ctx->nfs_server.hostname, 689 .addr = &ctx->nfs_server._address, 690 .addrlen = ctx->nfs_server.addrlen, 691 .nfs_mod = ctx->nfs_mod, 692 .proto = ctx->nfs_server.protocol, 693 .net = fc->net_ns, 694 .timeparms = &timeparms, 695 .cred = server->cred, 696 .nconnect = ctx->nfs_server.nconnect, 697 .init_flags = (1UL << NFS_CS_REUSEPORT), 698 .xprtsec = ctx->xprtsec, 699 }; 700 struct nfs_client *clp; 701 int error; 702 703 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 704 ctx->timeo, ctx->retrans); 705 if (ctx->flags & NFS_MOUNT_NORESVPORT) 706 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 707 708 /* Allocate or find a client reference we can use */ 709 clp = nfs_get_client(&cl_init); 710 if (IS_ERR(clp)) 711 return PTR_ERR(clp); 712 713 server->nfs_client = clp; 714 nfs_sysfs_add_server(server); 715 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 716 717 /* Initialise the client representation from the mount data */ 718 server->flags = ctx->flags; 719 server->options = ctx->options; 720 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 721 722 switch (clp->rpc_ops->version) { 723 case 2: 724 server->fattr_valid = NFS_ATTR_FATTR_V2; 725 break; 726 case 3: 727 server->fattr_valid = NFS_ATTR_FATTR_V3; 728 break; 729 default: 730 server->fattr_valid = NFS_ATTR_FATTR_V4; 731 } 732 733 if (ctx->rsize) 734 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 735 if (ctx->wsize) 736 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 737 738 server->acregmin = ctx->acregmin * HZ; 739 server->acregmax = ctx->acregmax * HZ; 740 server->acdirmin = ctx->acdirmin * HZ; 741 server->acdirmax = ctx->acdirmax * HZ; 742 743 /* Start lockd here, before we might error out */ 744 error = nfs_start_lockd(server); 745 if (error < 0) 746 goto error; 747 748 server->port = ctx->nfs_server.port; 749 server->auth_info = ctx->auth_info; 750 751 error = nfs_init_server_rpcclient(server, &timeparms, 752 ctx->selected_flavor); 753 if (error < 0) 754 goto error; 755 756 /* Preserve the values of mount_server-related mount options */ 757 if (ctx->mount_server.addrlen) { 758 memcpy(&server->mountd_address, &ctx->mount_server.address, 759 ctx->mount_server.addrlen); 760 server->mountd_addrlen = ctx->mount_server.addrlen; 761 } 762 server->mountd_version = ctx->mount_server.version; 763 server->mountd_port = ctx->mount_server.port; 764 server->mountd_protocol = ctx->mount_server.protocol; 765 766 server->namelen = ctx->namlen; 767 return 0; 768 769 error: 770 server->nfs_client = NULL; 771 nfs_put_client(clp); 772 return error; 773 } 774 775 /* 776 * Load up the server record from information gained in an fsinfo record 777 */ 778 static void nfs_server_set_fsinfo(struct nfs_server *server, 779 struct nfs_fsinfo *fsinfo) 780 { 781 struct nfs_client *clp = server->nfs_client; 782 unsigned long max_rpc_payload, raw_max_rpc_payload; 783 784 /* Work out a lot of parameters */ 785 if (server->rsize == 0) 786 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 787 if (server->wsize == 0) 788 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 789 790 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 791 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 792 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 793 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 794 795 raw_max_rpc_payload = rpc_max_payload(server->client); 796 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 797 798 if (server->rsize > max_rpc_payload) 799 server->rsize = max_rpc_payload; 800 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 801 server->rsize = NFS_MAX_FILE_IO_SIZE; 802 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 803 804 if (server->wsize > max_rpc_payload) 805 server->wsize = max_rpc_payload; 806 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 807 server->wsize = NFS_MAX_FILE_IO_SIZE; 808 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 809 810 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 811 812 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 813 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 814 server->dtsize = NFS_MAX_FILE_IO_SIZE; 815 if (server->dtsize > server->rsize) 816 server->dtsize = server->rsize; 817 818 if (server->flags & NFS_MOUNT_NOAC) { 819 server->acregmin = server->acregmax = 0; 820 server->acdirmin = server->acdirmax = 0; 821 } 822 823 server->maxfilesize = fsinfo->maxfilesize; 824 825 server->time_delta = fsinfo->time_delta; 826 server->change_attr_type = fsinfo->change_attr_type; 827 828 server->clone_blksize = fsinfo->clone_blksize; 829 /* We're airborne Set socket buffersize */ 830 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 831 832 #ifdef CONFIG_NFS_V4_2 833 /* 834 * Defaults until limited by the session parameters. 835 */ 836 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 837 XATTR_SIZE_MAX); 838 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 839 XATTR_SIZE_MAX); 840 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 841 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 842 843 if (fsinfo->xattr_support) 844 server->caps |= NFS_CAP_XATTR; 845 #endif 846 } 847 848 /* 849 * Probe filesystem information, including the FSID on v2/v3 850 */ 851 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 852 { 853 struct nfs_fsinfo fsinfo; 854 struct nfs_client *clp = server->nfs_client; 855 int error; 856 857 if (clp->rpc_ops->set_capabilities != NULL) { 858 error = clp->rpc_ops->set_capabilities(server, mntfh); 859 if (error < 0) 860 return error; 861 } 862 863 fsinfo.fattr = fattr; 864 fsinfo.nlayouttypes = 0; 865 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 866 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 867 if (error < 0) 868 return error; 869 870 nfs_server_set_fsinfo(server, &fsinfo); 871 872 /* Get some general file system info */ 873 if (server->namelen == 0) { 874 struct nfs_pathconf pathinfo; 875 876 pathinfo.fattr = fattr; 877 nfs_fattr_init(fattr); 878 879 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 880 server->namelen = pathinfo.max_namelen; 881 } 882 883 if (clp->rpc_ops->discover_trunking != NULL && 884 (server->caps & NFS_CAP_FS_LOCATIONS && 885 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 886 error = clp->rpc_ops->discover_trunking(server, mntfh); 887 if (error < 0) 888 return error; 889 } 890 891 return 0; 892 } 893 894 /* 895 * Grab the destination's particulars, including lease expiry time. 896 * 897 * Returns zero if probe succeeded and retrieved FSID matches the FSID 898 * we have cached. 899 */ 900 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 901 { 902 struct nfs_fattr *fattr; 903 int error; 904 905 fattr = nfs_alloc_fattr(); 906 if (fattr == NULL) 907 return -ENOMEM; 908 909 /* Sanity: the probe won't work if the destination server 910 * does not recognize the migrated FH. */ 911 error = nfs_probe_fsinfo(server, mntfh, fattr); 912 913 nfs_free_fattr(fattr); 914 return error; 915 } 916 EXPORT_SYMBOL_GPL(nfs_probe_server); 917 918 /* 919 * Copy useful information when duplicating a server record 920 */ 921 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 922 { 923 target->flags = source->flags; 924 target->rsize = source->rsize; 925 target->wsize = source->wsize; 926 target->acregmin = source->acregmin; 927 target->acregmax = source->acregmax; 928 target->acdirmin = source->acdirmin; 929 target->acdirmax = source->acdirmax; 930 target->caps = source->caps; 931 target->options = source->options; 932 target->auth_info = source->auth_info; 933 target->port = source->port; 934 } 935 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 936 937 void nfs_server_insert_lists(struct nfs_server *server) 938 { 939 struct nfs_client *clp = server->nfs_client; 940 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 941 942 spin_lock(&nn->nfs_client_lock); 943 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 944 list_add_tail(&server->master_link, &nn->nfs_volume_list); 945 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 946 spin_unlock(&nn->nfs_client_lock); 947 948 } 949 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 950 951 void nfs_server_remove_lists(struct nfs_server *server) 952 { 953 struct nfs_client *clp = server->nfs_client; 954 struct nfs_net *nn; 955 956 if (clp == NULL) 957 return; 958 nn = net_generic(clp->cl_net, nfs_net_id); 959 spin_lock(&nn->nfs_client_lock); 960 list_del_rcu(&server->client_link); 961 if (list_empty(&clp->cl_superblocks)) 962 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 963 list_del(&server->master_link); 964 spin_unlock(&nn->nfs_client_lock); 965 966 synchronize_rcu(); 967 } 968 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 969 970 static DEFINE_IDA(s_sysfs_ids); 971 972 /* 973 * Allocate and initialise a server record 974 */ 975 struct nfs_server *nfs_alloc_server(void) 976 { 977 struct nfs_server *server; 978 979 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 980 if (!server) 981 return NULL; 982 983 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 984 if (server->s_sysfs_id < 0) { 985 kfree(server); 986 return NULL; 987 } 988 989 server->client = server->client_acl = ERR_PTR(-EINVAL); 990 991 /* Zero out the NFS state stuff */ 992 INIT_LIST_HEAD(&server->client_link); 993 INIT_LIST_HEAD(&server->master_link); 994 INIT_LIST_HEAD(&server->delegations); 995 INIT_LIST_HEAD(&server->layouts); 996 INIT_LIST_HEAD(&server->state_owners_lru); 997 INIT_LIST_HEAD(&server->ss_copies); 998 INIT_LIST_HEAD(&server->ss_src_copies); 999 1000 atomic_set(&server->active, 0); 1001 1002 server->io_stats = nfs_alloc_iostats(); 1003 if (!server->io_stats) { 1004 kfree(server); 1005 return NULL; 1006 } 1007 1008 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 1009 1010 init_waitqueue_head(&server->write_congestion_wait); 1011 atomic_long_set(&server->writeback, 0); 1012 1013 atomic64_set(&server->owner_ctr, 0); 1014 1015 pnfs_init_server(server); 1016 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1017 1018 return server; 1019 } 1020 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1021 1022 static void delayed_free(struct rcu_head *p) 1023 { 1024 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1025 1026 nfs_free_iostats(server->io_stats); 1027 kfree(server); 1028 } 1029 1030 /* 1031 * Free up a server record 1032 */ 1033 void nfs_free_server(struct nfs_server *server) 1034 { 1035 nfs_server_remove_lists(server); 1036 1037 if (server->destroy != NULL) 1038 server->destroy(server); 1039 1040 if (!IS_ERR(server->client_acl)) 1041 rpc_shutdown_client(server->client_acl); 1042 if (!IS_ERR(server->client)) 1043 rpc_shutdown_client(server->client); 1044 1045 nfs_put_client(server->nfs_client); 1046 1047 if (server->kobj.state_initialized) { 1048 nfs_sysfs_remove_server(server); 1049 kobject_put(&server->kobj); 1050 } 1051 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1052 1053 put_cred(server->cred); 1054 nfs_release_automount_timer(); 1055 call_rcu(&server->rcu, delayed_free); 1056 } 1057 EXPORT_SYMBOL_GPL(nfs_free_server); 1058 1059 /* 1060 * Create a version 2 or 3 volume record 1061 * - keyed on server and FSID 1062 */ 1063 struct nfs_server *nfs_create_server(struct fs_context *fc) 1064 { 1065 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1066 struct nfs_server *server; 1067 struct nfs_fattr *fattr; 1068 int error; 1069 1070 server = nfs_alloc_server(); 1071 if (!server) 1072 return ERR_PTR(-ENOMEM); 1073 1074 server->cred = get_cred(fc->cred); 1075 1076 error = -ENOMEM; 1077 fattr = nfs_alloc_fattr(); 1078 if (fattr == NULL) 1079 goto error; 1080 1081 /* Get a client representation */ 1082 error = nfs_init_server(server, fc); 1083 if (error < 0) 1084 goto error; 1085 1086 /* Probe the root fh to retrieve its FSID */ 1087 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1088 if (error < 0) 1089 goto error; 1090 if (server->nfs_client->rpc_ops->version == 3) { 1091 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1092 server->namelen = NFS3_MAXNAMLEN; 1093 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1094 server->caps |= NFS_CAP_READDIRPLUS; 1095 } else { 1096 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1097 server->namelen = NFS2_MAXNAMLEN; 1098 } 1099 1100 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1101 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1102 fattr, NULL); 1103 if (error < 0) { 1104 dprintk("nfs_create_server: getattr error = %d\n", -error); 1105 goto error; 1106 } 1107 } 1108 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1109 1110 dprintk("Server FSID: %llx:%llx\n", 1111 (unsigned long long) server->fsid.major, 1112 (unsigned long long) server->fsid.minor); 1113 1114 nfs_server_insert_lists(server); 1115 server->mount_time = jiffies; 1116 nfs_free_fattr(fattr); 1117 return server; 1118 1119 error: 1120 nfs_free_fattr(fattr); 1121 nfs_free_server(server); 1122 return ERR_PTR(error); 1123 } 1124 EXPORT_SYMBOL_GPL(nfs_create_server); 1125 1126 /* 1127 * Clone an NFS2, NFS3 or NFS4 server record 1128 */ 1129 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1130 struct nfs_fh *fh, 1131 struct nfs_fattr *fattr, 1132 rpc_authflavor_t flavor) 1133 { 1134 struct nfs_server *server; 1135 int error; 1136 1137 server = nfs_alloc_server(); 1138 if (!server) 1139 return ERR_PTR(-ENOMEM); 1140 1141 server->cred = get_cred(source->cred); 1142 1143 /* Copy data from the source */ 1144 server->nfs_client = source->nfs_client; 1145 server->destroy = source->destroy; 1146 refcount_inc(&server->nfs_client->cl_count); 1147 nfs_server_copy_userdata(server, source); 1148 1149 server->fsid = fattr->fsid; 1150 1151 nfs_sysfs_add_server(server); 1152 1153 nfs_sysfs_link_rpc_client(server, 1154 server->nfs_client->cl_rpcclient, "_state"); 1155 1156 error = nfs_init_server_rpcclient(server, 1157 source->client->cl_timeout, 1158 flavor); 1159 if (error < 0) 1160 goto out_free_server; 1161 1162 /* probe the filesystem info for this server filesystem */ 1163 error = nfs_probe_server(server, fh); 1164 if (error < 0) 1165 goto out_free_server; 1166 1167 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1168 server->namelen = NFS4_MAXNAMLEN; 1169 1170 error = nfs_start_lockd(server); 1171 if (error < 0) 1172 goto out_free_server; 1173 1174 nfs_server_insert_lists(server); 1175 server->mount_time = jiffies; 1176 1177 return server; 1178 1179 out_free_server: 1180 nfs_free_server(server); 1181 return ERR_PTR(error); 1182 } 1183 EXPORT_SYMBOL_GPL(nfs_clone_server); 1184 1185 void nfs_clients_init(struct net *net) 1186 { 1187 struct nfs_net *nn = net_generic(net, nfs_net_id); 1188 1189 INIT_LIST_HEAD(&nn->nfs_client_list); 1190 INIT_LIST_HEAD(&nn->nfs_volume_list); 1191 #if IS_ENABLED(CONFIG_NFS_V4) 1192 idr_init(&nn->cb_ident_idr); 1193 #endif 1194 spin_lock_init(&nn->nfs_client_lock); 1195 nn->boot_time = ktime_get_real(); 1196 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1197 nn->rpcstats.program = &nfs_program; 1198 1199 nfs_netns_sysfs_setup(nn, net); 1200 } 1201 1202 void nfs_clients_exit(struct net *net) 1203 { 1204 struct nfs_net *nn = net_generic(net, nfs_net_id); 1205 1206 nfs_netns_sysfs_destroy(nn); 1207 nfs_cleanup_cb_ident_idr(net); 1208 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1209 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1210 } 1211 1212 #ifdef CONFIG_PROC_FS 1213 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1214 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1215 static void nfs_server_list_stop(struct seq_file *p, void *v); 1216 static int nfs_server_list_show(struct seq_file *m, void *v); 1217 1218 static const struct seq_operations nfs_server_list_ops = { 1219 .start = nfs_server_list_start, 1220 .next = nfs_server_list_next, 1221 .stop = nfs_server_list_stop, 1222 .show = nfs_server_list_show, 1223 }; 1224 1225 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1226 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1227 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1228 static int nfs_volume_list_show(struct seq_file *m, void *v); 1229 1230 static const struct seq_operations nfs_volume_list_ops = { 1231 .start = nfs_volume_list_start, 1232 .next = nfs_volume_list_next, 1233 .stop = nfs_volume_list_stop, 1234 .show = nfs_volume_list_show, 1235 }; 1236 1237 /* 1238 * set up the iterator to start reading from the server list and return the first item 1239 */ 1240 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1241 __acquires(&nn->nfs_client_lock) 1242 { 1243 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1244 1245 /* lock the list against modification */ 1246 spin_lock(&nn->nfs_client_lock); 1247 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1248 } 1249 1250 /* 1251 * move to next server 1252 */ 1253 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1254 { 1255 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1256 1257 return seq_list_next(v, &nn->nfs_client_list, pos); 1258 } 1259 1260 /* 1261 * clean up after reading from the transports list 1262 */ 1263 static void nfs_server_list_stop(struct seq_file *p, void *v) 1264 __releases(&nn->nfs_client_lock) 1265 { 1266 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1267 1268 spin_unlock(&nn->nfs_client_lock); 1269 } 1270 1271 /* 1272 * display a header line followed by a load of call lines 1273 */ 1274 static int nfs_server_list_show(struct seq_file *m, void *v) 1275 { 1276 struct nfs_client *clp; 1277 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1278 1279 /* display header on line 1 */ 1280 if (v == &nn->nfs_client_list) { 1281 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1282 return 0; 1283 } 1284 1285 /* display one transport per line on subsequent lines */ 1286 clp = list_entry(v, struct nfs_client, cl_share_link); 1287 1288 /* Check if the client is initialized */ 1289 if (clp->cl_cons_state != NFS_CS_READY) 1290 return 0; 1291 1292 rcu_read_lock(); 1293 seq_printf(m, "v%u %s %s %3d %s\n", 1294 clp->rpc_ops->version, 1295 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1296 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1297 refcount_read(&clp->cl_count), 1298 clp->cl_hostname); 1299 rcu_read_unlock(); 1300 1301 return 0; 1302 } 1303 1304 /* 1305 * set up the iterator to start reading from the volume list and return the first item 1306 */ 1307 static void *nfs_volume_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_volume_list, *_pos); 1315 } 1316 1317 /* 1318 * move to next volume 1319 */ 1320 static void *nfs_volume_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_volume_list, pos); 1325 } 1326 1327 /* 1328 * clean up after reading from the transports list 1329 */ 1330 static void nfs_volume_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_volume_list_show(struct seq_file *m, void *v) 1342 { 1343 struct nfs_server *server; 1344 struct nfs_client *clp; 1345 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1346 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1347 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1348 1349 /* display header on line 1 */ 1350 if (v == &nn->nfs_volume_list) { 1351 seq_puts(m, "NV SERVER PORT DEV FSID" 1352 " FSC\n"); 1353 return 0; 1354 } 1355 /* display one transport per line on subsequent lines */ 1356 server = list_entry(v, struct nfs_server, master_link); 1357 clp = server->nfs_client; 1358 1359 snprintf(dev, sizeof(dev), "%u:%u", 1360 MAJOR(server->s_dev), MINOR(server->s_dev)); 1361 1362 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1363 (unsigned long long) server->fsid.major, 1364 (unsigned long long) server->fsid.minor); 1365 1366 rcu_read_lock(); 1367 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1368 clp->rpc_ops->version, 1369 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1370 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1371 dev, 1372 fsid, 1373 nfs_server_fscache_state(server)); 1374 rcu_read_unlock(); 1375 1376 return 0; 1377 } 1378 1379 int nfs_fs_proc_net_init(struct net *net) 1380 { 1381 struct nfs_net *nn = net_generic(net, nfs_net_id); 1382 struct proc_dir_entry *p; 1383 1384 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1385 if (!nn->proc_nfsfs) 1386 goto error_0; 1387 1388 /* a file of servers with which we're dealing */ 1389 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1390 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1391 if (!p) 1392 goto error_1; 1393 1394 /* a file of volumes that we have mounted */ 1395 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1396 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1397 if (!p) 1398 goto error_1; 1399 return 0; 1400 1401 error_1: 1402 remove_proc_subtree("nfsfs", net->proc_net); 1403 error_0: 1404 return -ENOMEM; 1405 } 1406 1407 void nfs_fs_proc_net_exit(struct net *net) 1408 { 1409 remove_proc_subtree("nfsfs", net->proc_net); 1410 } 1411 1412 /* 1413 * initialise the /proc/fs/nfsfs/ directory 1414 */ 1415 int __init nfs_fs_proc_init(void) 1416 { 1417 if (!proc_mkdir("fs/nfsfs", NULL)) 1418 goto error_0; 1419 1420 /* a file of servers with which we're dealing */ 1421 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1422 goto error_1; 1423 1424 /* a file of volumes that we have mounted */ 1425 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1426 goto error_1; 1427 1428 return 0; 1429 error_1: 1430 remove_proc_subtree("fs/nfsfs", NULL); 1431 error_0: 1432 return -ENOMEM; 1433 } 1434 1435 /* 1436 * clean up the /proc/fs/nfsfs/ directory 1437 */ 1438 void nfs_fs_proc_exit(void) 1439 { 1440 remove_proc_subtree("fs/nfsfs", NULL); 1441 ida_destroy(&s_sysfs_ids); 1442 } 1443 1444 #endif /* CONFIG_PROC_FS */ 1445