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 clp->cl_principal = "*"; 182 clp->cl_xprtsec = cl_init->xprtsec; 183 return clp; 184 185 error_cleanup: 186 put_nfs_version(clp->cl_nfs_mod); 187 error_dealloc: 188 kfree(clp); 189 error_0: 190 return ERR_PTR(err); 191 } 192 EXPORT_SYMBOL_GPL(nfs_alloc_client); 193 194 #if IS_ENABLED(CONFIG_NFS_V4) 195 static void nfs_cleanup_cb_ident_idr(struct net *net) 196 { 197 struct nfs_net *nn = net_generic(net, nfs_net_id); 198 199 idr_destroy(&nn->cb_ident_idr); 200 } 201 202 /* nfs_client_lock held */ 203 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 204 { 205 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 206 207 if (clp->cl_cb_ident) 208 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 209 } 210 211 static void pnfs_init_server(struct nfs_server *server) 212 { 213 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 214 } 215 216 #else 217 static void nfs_cleanup_cb_ident_idr(struct net *net) 218 { 219 } 220 221 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 222 { 223 } 224 225 static void pnfs_init_server(struct nfs_server *server) 226 { 227 } 228 229 #endif /* CONFIG_NFS_V4 */ 230 231 /* 232 * Destroy a shared client record 233 */ 234 void nfs_free_client(struct nfs_client *clp) 235 { 236 /* -EIO all pending I/O */ 237 if (!IS_ERR(clp->cl_rpcclient)) 238 rpc_shutdown_client(clp->cl_rpcclient); 239 240 put_net(clp->cl_net); 241 put_nfs_version(clp->cl_nfs_mod); 242 kfree(clp->cl_hostname); 243 kfree(clp->cl_acceptor); 244 kfree_rcu(clp, rcu); 245 } 246 EXPORT_SYMBOL_GPL(nfs_free_client); 247 248 /* 249 * Release a reference to a shared client record 250 */ 251 void nfs_put_client(struct nfs_client *clp) 252 { 253 struct nfs_net *nn; 254 255 if (!clp) 256 return; 257 258 nn = net_generic(clp->cl_net, nfs_net_id); 259 260 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 261 list_del(&clp->cl_share_link); 262 nfs_cb_idr_remove_locked(clp); 263 spin_unlock(&nn->nfs_client_lock); 264 265 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 266 267 clp->rpc_ops->free_client(clp); 268 } 269 } 270 EXPORT_SYMBOL_GPL(nfs_put_client); 271 272 /* 273 * Find an nfs_client on the list that matches the initialisation data 274 * that is supplied. 275 */ 276 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 277 { 278 struct nfs_client *clp; 279 const struct sockaddr *sap = (struct sockaddr *)data->addr; 280 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 281 int error; 282 283 again: 284 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 285 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 286 /* Don't match clients that failed to initialise properly */ 287 if (clp->cl_cons_state < 0) 288 continue; 289 290 /* If a client is still initializing then we need to wait */ 291 if (clp->cl_cons_state > NFS_CS_READY) { 292 refcount_inc(&clp->cl_count); 293 spin_unlock(&nn->nfs_client_lock); 294 error = nfs_wait_client_init_complete(clp); 295 nfs_put_client(clp); 296 spin_lock(&nn->nfs_client_lock); 297 if (error < 0) 298 return ERR_PTR(error); 299 goto again; 300 } 301 302 /* Different NFS versions cannot share the same nfs_client */ 303 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 304 continue; 305 306 if (clp->cl_proto != data->proto) 307 continue; 308 /* Match nfsv4 minorversion */ 309 if (clp->cl_minorversion != data->minorversion) 310 continue; 311 312 /* Match request for a dedicated DS */ 313 if (test_bit(NFS_CS_DS, &data->init_flags) != 314 test_bit(NFS_CS_DS, &clp->cl_flags)) 315 continue; 316 317 /* Match the full socket address */ 318 if (!rpc_cmp_addr_port(sap, clap)) 319 /* Match all xprt_switch full socket addresses */ 320 if (IS_ERR(clp->cl_rpcclient) || 321 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 322 sap)) 323 continue; 324 325 /* Match the xprt security policy */ 326 if (clp->cl_xprtsec.policy != data->xprtsec.policy) 327 continue; 328 329 refcount_inc(&clp->cl_count); 330 return clp; 331 } 332 return NULL; 333 } 334 335 /* 336 * Return true if @clp is done initializing, false if still working on it. 337 * 338 * Use nfs_client_init_status to check if it was successful. 339 */ 340 bool nfs_client_init_is_complete(const struct nfs_client *clp) 341 { 342 return clp->cl_cons_state <= NFS_CS_READY; 343 } 344 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 345 346 /* 347 * Return 0 if @clp was successfully initialized, -errno otherwise. 348 * 349 * This must be called *after* nfs_client_init_is_complete() returns true, 350 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 351 */ 352 int nfs_client_init_status(const struct nfs_client *clp) 353 { 354 /* called without checking nfs_client_init_is_complete */ 355 if (clp->cl_cons_state > NFS_CS_READY) { 356 WARN_ON_ONCE(1); 357 return -EINVAL; 358 } 359 return clp->cl_cons_state; 360 } 361 EXPORT_SYMBOL_GPL(nfs_client_init_status); 362 363 int nfs_wait_client_init_complete(const struct nfs_client *clp) 364 { 365 return wait_event_killable(nfs_client_active_wq, 366 nfs_client_init_is_complete(clp)); 367 } 368 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 369 370 /* 371 * Found an existing client. Make sure it's ready before returning. 372 */ 373 static struct nfs_client * 374 nfs_found_client(const struct nfs_client_initdata *cl_init, 375 struct nfs_client *clp) 376 { 377 int error; 378 379 error = nfs_wait_client_init_complete(clp); 380 if (error < 0) { 381 nfs_put_client(clp); 382 return ERR_PTR(-ERESTARTSYS); 383 } 384 385 if (clp->cl_cons_state < NFS_CS_READY) { 386 error = clp->cl_cons_state; 387 nfs_put_client(clp); 388 return ERR_PTR(error); 389 } 390 391 smp_rmb(); 392 return clp; 393 } 394 395 /* 396 * Look up a client by IP address and protocol version 397 * - creates a new record if one doesn't yet exist 398 */ 399 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 400 { 401 struct nfs_client *clp, *new = NULL; 402 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 403 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 404 405 if (cl_init->hostname == NULL) { 406 WARN_ON(1); 407 return ERR_PTR(-EINVAL); 408 } 409 410 /* see if the client already exists */ 411 do { 412 spin_lock(&nn->nfs_client_lock); 413 414 clp = nfs_match_client(cl_init); 415 if (clp) { 416 spin_unlock(&nn->nfs_client_lock); 417 if (new) 418 new->rpc_ops->free_client(new); 419 if (IS_ERR(clp)) 420 return clp; 421 return nfs_found_client(cl_init, clp); 422 } 423 if (new) { 424 list_add_tail(&new->cl_share_link, 425 &nn->nfs_client_list); 426 spin_unlock(&nn->nfs_client_lock); 427 return rpc_ops->init_client(new, cl_init); 428 } 429 430 spin_unlock(&nn->nfs_client_lock); 431 432 new = rpc_ops->alloc_client(cl_init); 433 } while (!IS_ERR(new)); 434 435 return new; 436 } 437 EXPORT_SYMBOL_GPL(nfs_get_client); 438 439 /* 440 * Mark a server as ready or failed 441 */ 442 void nfs_mark_client_ready(struct nfs_client *clp, int state) 443 { 444 smp_wmb(); 445 clp->cl_cons_state = state; 446 wake_up_all(&nfs_client_active_wq); 447 } 448 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 449 450 /* 451 * Initialise the timeout values for a connection 452 */ 453 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 454 int timeo, int retrans) 455 { 456 to->to_initval = timeo * HZ / 10; 457 to->to_retries = retrans; 458 459 switch (proto) { 460 case XPRT_TRANSPORT_TCP: 461 case XPRT_TRANSPORT_TCP_TLS: 462 case XPRT_TRANSPORT_RDMA: 463 if (retrans == NFS_UNSPEC_RETRANS) 464 to->to_retries = NFS_DEF_TCP_RETRANS; 465 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 466 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 467 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 468 to->to_initval = NFS_MAX_TCP_TIMEOUT; 469 to->to_increment = to->to_initval; 470 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 471 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 472 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 473 if (to->to_maxval < to->to_initval) 474 to->to_maxval = to->to_initval; 475 to->to_exponential = 0; 476 break; 477 case XPRT_TRANSPORT_UDP: 478 if (retrans == NFS_UNSPEC_RETRANS) 479 to->to_retries = NFS_DEF_UDP_RETRANS; 480 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 481 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 482 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 483 to->to_initval = NFS_MAX_UDP_TIMEOUT; 484 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 485 to->to_exponential = 1; 486 break; 487 default: 488 BUG(); 489 } 490 } 491 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 492 493 /* 494 * Create an RPC client handle 495 */ 496 int nfs_create_rpc_client(struct nfs_client *clp, 497 const struct nfs_client_initdata *cl_init, 498 rpc_authflavor_t flavor) 499 { 500 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 501 struct rpc_clnt *clnt = NULL; 502 struct rpc_create_args args = { 503 .net = clp->cl_net, 504 .protocol = clp->cl_proto, 505 .nconnect = clp->cl_nconnect, 506 .address = (struct sockaddr *)&clp->cl_addr, 507 .addrsize = clp->cl_addrlen, 508 .timeout = cl_init->timeparms, 509 .servername = clp->cl_hostname, 510 .nodename = cl_init->nodename, 511 .program = &nfs_program, 512 .stats = &nn->rpcstats, 513 .version = clp->rpc_ops->version, 514 .authflavor = flavor, 515 .cred = cl_init->cred, 516 .xprtsec = cl_init->xprtsec, 517 .connect_timeout = cl_init->connect_timeout, 518 .reconnect_timeout = cl_init->reconnect_timeout, 519 }; 520 521 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 522 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 523 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 524 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 525 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 527 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 528 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 529 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 530 args.flags |= RPC_CLNT_CREATE_NOPING; 531 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 532 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 533 534 if (!IS_ERR(clp->cl_rpcclient)) 535 return 0; 536 537 clnt = rpc_create(&args); 538 if (IS_ERR(clnt)) { 539 dprintk("%s: cannot create RPC client. Error = %ld\n", 540 __func__, PTR_ERR(clnt)); 541 return PTR_ERR(clnt); 542 } 543 544 clnt->cl_principal = clp->cl_principal; 545 clp->cl_rpcclient = clnt; 546 clnt->cl_max_connect = clp->cl_max_connect; 547 return 0; 548 } 549 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 550 551 /* 552 * Version 2 or 3 client destruction 553 */ 554 static void nfs_destroy_server(struct nfs_server *server) 555 { 556 if (server->nlm_host) 557 nlmclnt_done(server->nlm_host); 558 } 559 560 /* 561 * Version 2 or 3 lockd setup 562 */ 563 static int nfs_start_lockd(struct nfs_server *server) 564 { 565 struct nlm_host *host; 566 struct nfs_client *clp = server->nfs_client; 567 struct nlmclnt_initdata nlm_init = { 568 .hostname = clp->cl_hostname, 569 .address = (struct sockaddr *)&clp->cl_addr, 570 .addrlen = clp->cl_addrlen, 571 .nfs_version = clp->rpc_ops->version, 572 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 573 1 : 0, 574 .net = clp->cl_net, 575 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 576 .cred = server->cred, 577 }; 578 579 if (nlm_init.nfs_version > 3) 580 return 0; 581 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 582 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 583 return 0; 584 585 switch (clp->cl_proto) { 586 default: 587 nlm_init.protocol = IPPROTO_TCP; 588 break; 589 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 590 case XPRT_TRANSPORT_UDP: 591 nlm_init.protocol = IPPROTO_UDP; 592 #endif 593 } 594 595 host = nlmclnt_init(&nlm_init); 596 if (IS_ERR(host)) 597 return PTR_ERR(host); 598 599 server->nlm_host = host; 600 server->destroy = nfs_destroy_server; 601 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 602 return 0; 603 } 604 605 /* 606 * Create a general RPC client 607 */ 608 int nfs_init_server_rpcclient(struct nfs_server *server, 609 const struct rpc_timeout *timeo, 610 rpc_authflavor_t pseudoflavour) 611 { 612 struct nfs_client *clp = server->nfs_client; 613 614 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 615 pseudoflavour); 616 if (IS_ERR(server->client)) { 617 dprintk("%s: couldn't create rpc_client!\n", __func__); 618 return PTR_ERR(server->client); 619 } 620 621 memcpy(&server->client->cl_timeout_default, 622 timeo, 623 sizeof(server->client->cl_timeout_default)); 624 server->client->cl_timeout = &server->client->cl_timeout_default; 625 server->client->cl_softrtry = 0; 626 if (server->flags & NFS_MOUNT_SOFTERR) 627 server->client->cl_softerr = 1; 628 if (server->flags & NFS_MOUNT_SOFT) 629 server->client->cl_softrtry = 1; 630 631 nfs_sysfs_link_rpc_client(server, server->client, NULL); 632 return 0; 633 } 634 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 635 636 /** 637 * nfs_init_client - Initialise an NFS2 or NFS3 client 638 * 639 * @clp: nfs_client to initialise 640 * @cl_init: Initialisation parameters 641 * 642 * Returns pointer to an NFS client, or an ERR_PTR value. 643 */ 644 struct nfs_client *nfs_init_client(struct nfs_client *clp, 645 const struct nfs_client_initdata *cl_init) 646 { 647 int error; 648 649 /* the client is already initialised */ 650 if (clp->cl_cons_state == NFS_CS_READY) 651 return clp; 652 653 /* 654 * Create a client RPC handle for doing FSSTAT with UNIX auth only 655 * - RFC 2623, sec 2.3.2 656 */ 657 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 658 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 659 if (error < 0) { 660 nfs_put_client(clp); 661 clp = ERR_PTR(error); 662 } 663 return clp; 664 } 665 EXPORT_SYMBOL_GPL(nfs_init_client); 666 667 /* 668 * Create a version 2 or 3 client 669 */ 670 static int nfs_init_server(struct nfs_server *server, 671 const struct fs_context *fc) 672 { 673 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 674 struct rpc_timeout timeparms; 675 struct nfs_client_initdata cl_init = { 676 .hostname = ctx->nfs_server.hostname, 677 .addr = &ctx->nfs_server._address, 678 .addrlen = ctx->nfs_server.addrlen, 679 .nfs_mod = ctx->nfs_mod, 680 .proto = ctx->nfs_server.protocol, 681 .net = fc->net_ns, 682 .timeparms = &timeparms, 683 .cred = server->cred, 684 .nconnect = ctx->nfs_server.nconnect, 685 .init_flags = (1UL << NFS_CS_REUSEPORT), 686 .xprtsec = ctx->xprtsec, 687 }; 688 struct nfs_client *clp; 689 int error; 690 691 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 692 ctx->timeo, ctx->retrans); 693 if (ctx->flags & NFS_MOUNT_NORESVPORT) 694 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 695 696 /* Allocate or find a client reference we can use */ 697 clp = nfs_get_client(&cl_init); 698 if (IS_ERR(clp)) 699 return PTR_ERR(clp); 700 701 server->nfs_client = clp; 702 nfs_sysfs_add_server(server); 703 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 704 705 /* Initialise the client representation from the mount data */ 706 server->flags = ctx->flags; 707 server->options = ctx->options; 708 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 709 710 switch (clp->rpc_ops->version) { 711 case 2: 712 server->fattr_valid = NFS_ATTR_FATTR_V2; 713 break; 714 case 3: 715 server->fattr_valid = NFS_ATTR_FATTR_V3; 716 break; 717 default: 718 server->fattr_valid = NFS_ATTR_FATTR_V4; 719 } 720 721 if (ctx->rsize) 722 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 723 if (ctx->wsize) 724 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 725 726 server->acregmin = ctx->acregmin * HZ; 727 server->acregmax = ctx->acregmax * HZ; 728 server->acdirmin = ctx->acdirmin * HZ; 729 server->acdirmax = ctx->acdirmax * HZ; 730 731 /* Start lockd here, before we might error out */ 732 error = nfs_start_lockd(server); 733 if (error < 0) 734 goto error; 735 736 server->port = ctx->nfs_server.port; 737 server->auth_info = ctx->auth_info; 738 739 error = nfs_init_server_rpcclient(server, &timeparms, 740 ctx->selected_flavor); 741 if (error < 0) 742 goto error; 743 744 /* Preserve the values of mount_server-related mount options */ 745 if (ctx->mount_server.addrlen) { 746 memcpy(&server->mountd_address, &ctx->mount_server.address, 747 ctx->mount_server.addrlen); 748 server->mountd_addrlen = ctx->mount_server.addrlen; 749 } 750 server->mountd_version = ctx->mount_server.version; 751 server->mountd_port = ctx->mount_server.port; 752 server->mountd_protocol = ctx->mount_server.protocol; 753 754 server->namelen = ctx->namlen; 755 return 0; 756 757 error: 758 server->nfs_client = NULL; 759 nfs_put_client(clp); 760 return error; 761 } 762 763 /* 764 * Load up the server record from information gained in an fsinfo record 765 */ 766 static void nfs_server_set_fsinfo(struct nfs_server *server, 767 struct nfs_fsinfo *fsinfo) 768 { 769 struct nfs_client *clp = server->nfs_client; 770 unsigned long max_rpc_payload, raw_max_rpc_payload; 771 772 /* Work out a lot of parameters */ 773 if (server->rsize == 0) 774 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 775 if (server->wsize == 0) 776 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 777 778 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 779 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 780 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 781 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 782 783 raw_max_rpc_payload = rpc_max_payload(server->client); 784 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 785 786 if (server->rsize > max_rpc_payload) 787 server->rsize = max_rpc_payload; 788 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 789 server->rsize = NFS_MAX_FILE_IO_SIZE; 790 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 791 792 if (server->wsize > max_rpc_payload) 793 server->wsize = max_rpc_payload; 794 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 795 server->wsize = NFS_MAX_FILE_IO_SIZE; 796 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 797 798 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 799 800 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 801 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 802 server->dtsize = NFS_MAX_FILE_IO_SIZE; 803 if (server->dtsize > server->rsize) 804 server->dtsize = server->rsize; 805 806 if (server->flags & NFS_MOUNT_NOAC) { 807 server->acregmin = server->acregmax = 0; 808 server->acdirmin = server->acdirmax = 0; 809 } 810 811 server->maxfilesize = fsinfo->maxfilesize; 812 813 server->time_delta = fsinfo->time_delta; 814 server->change_attr_type = fsinfo->change_attr_type; 815 816 server->clone_blksize = fsinfo->clone_blksize; 817 /* We're airborne Set socket buffersize */ 818 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 819 820 #ifdef CONFIG_NFS_V4_2 821 /* 822 * Defaults until limited by the session parameters. 823 */ 824 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 825 XATTR_SIZE_MAX); 826 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 827 XATTR_SIZE_MAX); 828 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 829 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 830 831 if (fsinfo->xattr_support) 832 server->caps |= NFS_CAP_XATTR; 833 #endif 834 } 835 836 /* 837 * Probe filesystem information, including the FSID on v2/v3 838 */ 839 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 840 { 841 struct nfs_fsinfo fsinfo; 842 struct nfs_client *clp = server->nfs_client; 843 int error; 844 845 if (clp->rpc_ops->set_capabilities != NULL) { 846 error = clp->rpc_ops->set_capabilities(server, mntfh); 847 if (error < 0) 848 return error; 849 } 850 851 fsinfo.fattr = fattr; 852 fsinfo.nlayouttypes = 0; 853 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 854 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 855 if (error < 0) 856 return error; 857 858 nfs_server_set_fsinfo(server, &fsinfo); 859 860 /* Get some general file system info */ 861 if (server->namelen == 0) { 862 struct nfs_pathconf pathinfo; 863 864 pathinfo.fattr = fattr; 865 nfs_fattr_init(fattr); 866 867 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 868 server->namelen = pathinfo.max_namelen; 869 } 870 871 if (clp->rpc_ops->discover_trunking != NULL && 872 (server->caps & NFS_CAP_FS_LOCATIONS && 873 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 874 error = clp->rpc_ops->discover_trunking(server, mntfh); 875 if (error < 0) 876 return error; 877 } 878 879 return 0; 880 } 881 882 /* 883 * Grab the destination's particulars, including lease expiry time. 884 * 885 * Returns zero if probe succeeded and retrieved FSID matches the FSID 886 * we have cached. 887 */ 888 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 889 { 890 struct nfs_fattr *fattr; 891 int error; 892 893 fattr = nfs_alloc_fattr(); 894 if (fattr == NULL) 895 return -ENOMEM; 896 897 /* Sanity: the probe won't work if the destination server 898 * does not recognize the migrated FH. */ 899 error = nfs_probe_fsinfo(server, mntfh, fattr); 900 901 nfs_free_fattr(fattr); 902 return error; 903 } 904 EXPORT_SYMBOL_GPL(nfs_probe_server); 905 906 /* 907 * Copy useful information when duplicating a server record 908 */ 909 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 910 { 911 target->flags = source->flags; 912 target->rsize = source->rsize; 913 target->wsize = source->wsize; 914 target->acregmin = source->acregmin; 915 target->acregmax = source->acregmax; 916 target->acdirmin = source->acdirmin; 917 target->acdirmax = source->acdirmax; 918 target->caps = source->caps; 919 target->options = source->options; 920 target->auth_info = source->auth_info; 921 target->port = source->port; 922 } 923 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 924 925 void nfs_server_insert_lists(struct nfs_server *server) 926 { 927 struct nfs_client *clp = server->nfs_client; 928 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 929 930 spin_lock(&nn->nfs_client_lock); 931 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 932 list_add_tail(&server->master_link, &nn->nfs_volume_list); 933 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 934 spin_unlock(&nn->nfs_client_lock); 935 936 } 937 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 938 939 void nfs_server_remove_lists(struct nfs_server *server) 940 { 941 struct nfs_client *clp = server->nfs_client; 942 struct nfs_net *nn; 943 944 if (clp == NULL) 945 return; 946 nn = net_generic(clp->cl_net, nfs_net_id); 947 spin_lock(&nn->nfs_client_lock); 948 list_del_rcu(&server->client_link); 949 if (list_empty(&clp->cl_superblocks)) 950 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 951 list_del(&server->master_link); 952 spin_unlock(&nn->nfs_client_lock); 953 954 synchronize_rcu(); 955 } 956 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 957 958 static DEFINE_IDA(s_sysfs_ids); 959 960 /* 961 * Allocate and initialise a server record 962 */ 963 struct nfs_server *nfs_alloc_server(void) 964 { 965 struct nfs_server *server; 966 967 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 968 if (!server) 969 return NULL; 970 971 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 972 if (server->s_sysfs_id < 0) { 973 kfree(server); 974 return NULL; 975 } 976 977 server->client = server->client_acl = ERR_PTR(-EINVAL); 978 979 /* Zero out the NFS state stuff */ 980 INIT_LIST_HEAD(&server->client_link); 981 INIT_LIST_HEAD(&server->master_link); 982 INIT_LIST_HEAD(&server->delegations); 983 INIT_LIST_HEAD(&server->layouts); 984 INIT_LIST_HEAD(&server->state_owners_lru); 985 INIT_LIST_HEAD(&server->ss_copies); 986 987 atomic_set(&server->active, 0); 988 989 server->io_stats = nfs_alloc_iostats(); 990 if (!server->io_stats) { 991 kfree(server); 992 return NULL; 993 } 994 995 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 996 997 init_waitqueue_head(&server->write_congestion_wait); 998 atomic_long_set(&server->writeback, 0); 999 1000 ida_init(&server->openowner_id); 1001 ida_init(&server->lockowner_id); 1002 pnfs_init_server(server); 1003 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1004 1005 return server; 1006 } 1007 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1008 1009 static void delayed_free(struct rcu_head *p) 1010 { 1011 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1012 1013 nfs_free_iostats(server->io_stats); 1014 kfree(server); 1015 } 1016 1017 /* 1018 * Free up a server record 1019 */ 1020 void nfs_free_server(struct nfs_server *server) 1021 { 1022 nfs_server_remove_lists(server); 1023 1024 if (server->destroy != NULL) 1025 server->destroy(server); 1026 1027 if (!IS_ERR(server->client_acl)) 1028 rpc_shutdown_client(server->client_acl); 1029 if (!IS_ERR(server->client)) 1030 rpc_shutdown_client(server->client); 1031 1032 nfs_put_client(server->nfs_client); 1033 1034 if (server->kobj.state_initialized) { 1035 nfs_sysfs_remove_server(server); 1036 kobject_put(&server->kobj); 1037 } 1038 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1039 1040 ida_destroy(&server->lockowner_id); 1041 ida_destroy(&server->openowner_id); 1042 put_cred(server->cred); 1043 nfs_release_automount_timer(); 1044 call_rcu(&server->rcu, delayed_free); 1045 } 1046 EXPORT_SYMBOL_GPL(nfs_free_server); 1047 1048 /* 1049 * Create a version 2 or 3 volume record 1050 * - keyed on server and FSID 1051 */ 1052 struct nfs_server *nfs_create_server(struct fs_context *fc) 1053 { 1054 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1055 struct nfs_server *server; 1056 struct nfs_fattr *fattr; 1057 int error; 1058 1059 server = nfs_alloc_server(); 1060 if (!server) 1061 return ERR_PTR(-ENOMEM); 1062 1063 server->cred = get_cred(fc->cred); 1064 1065 error = -ENOMEM; 1066 fattr = nfs_alloc_fattr(); 1067 if (fattr == NULL) 1068 goto error; 1069 1070 /* Get a client representation */ 1071 error = nfs_init_server(server, fc); 1072 if (error < 0) 1073 goto error; 1074 1075 /* Probe the root fh to retrieve its FSID */ 1076 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1077 if (error < 0) 1078 goto error; 1079 if (server->nfs_client->rpc_ops->version == 3) { 1080 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1081 server->namelen = NFS3_MAXNAMLEN; 1082 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1083 server->caps |= NFS_CAP_READDIRPLUS; 1084 } else { 1085 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1086 server->namelen = NFS2_MAXNAMLEN; 1087 } 1088 1089 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1090 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1091 fattr, NULL); 1092 if (error < 0) { 1093 dprintk("nfs_create_server: getattr error = %d\n", -error); 1094 goto error; 1095 } 1096 } 1097 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1098 1099 dprintk("Server FSID: %llx:%llx\n", 1100 (unsigned long long) server->fsid.major, 1101 (unsigned long long) server->fsid.minor); 1102 1103 nfs_server_insert_lists(server); 1104 server->mount_time = jiffies; 1105 nfs_free_fattr(fattr); 1106 return server; 1107 1108 error: 1109 nfs_free_fattr(fattr); 1110 nfs_free_server(server); 1111 return ERR_PTR(error); 1112 } 1113 EXPORT_SYMBOL_GPL(nfs_create_server); 1114 1115 /* 1116 * Clone an NFS2, NFS3 or NFS4 server record 1117 */ 1118 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1119 struct nfs_fh *fh, 1120 struct nfs_fattr *fattr, 1121 rpc_authflavor_t flavor) 1122 { 1123 struct nfs_server *server; 1124 int error; 1125 1126 server = nfs_alloc_server(); 1127 if (!server) 1128 return ERR_PTR(-ENOMEM); 1129 1130 server->cred = get_cred(source->cred); 1131 1132 /* Copy data from the source */ 1133 server->nfs_client = source->nfs_client; 1134 server->destroy = source->destroy; 1135 refcount_inc(&server->nfs_client->cl_count); 1136 nfs_server_copy_userdata(server, source); 1137 1138 server->fsid = fattr->fsid; 1139 1140 nfs_sysfs_add_server(server); 1141 1142 nfs_sysfs_link_rpc_client(server, 1143 server->nfs_client->cl_rpcclient, "_state"); 1144 1145 error = nfs_init_server_rpcclient(server, 1146 source->client->cl_timeout, 1147 flavor); 1148 if (error < 0) 1149 goto out_free_server; 1150 1151 /* probe the filesystem info for this server filesystem */ 1152 error = nfs_probe_server(server, fh); 1153 if (error < 0) 1154 goto out_free_server; 1155 1156 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1157 server->namelen = NFS4_MAXNAMLEN; 1158 1159 error = nfs_start_lockd(server); 1160 if (error < 0) 1161 goto out_free_server; 1162 1163 nfs_server_insert_lists(server); 1164 server->mount_time = jiffies; 1165 1166 return server; 1167 1168 out_free_server: 1169 nfs_free_server(server); 1170 return ERR_PTR(error); 1171 } 1172 EXPORT_SYMBOL_GPL(nfs_clone_server); 1173 1174 void nfs_clients_init(struct net *net) 1175 { 1176 struct nfs_net *nn = net_generic(net, nfs_net_id); 1177 1178 INIT_LIST_HEAD(&nn->nfs_client_list); 1179 INIT_LIST_HEAD(&nn->nfs_volume_list); 1180 #if IS_ENABLED(CONFIG_NFS_V4) 1181 idr_init(&nn->cb_ident_idr); 1182 #endif 1183 spin_lock_init(&nn->nfs_client_lock); 1184 nn->boot_time = ktime_get_real(); 1185 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1186 nn->rpcstats.program = &nfs_program; 1187 1188 nfs_netns_sysfs_setup(nn, net); 1189 } 1190 1191 void nfs_clients_exit(struct net *net) 1192 { 1193 struct nfs_net *nn = net_generic(net, nfs_net_id); 1194 1195 nfs_netns_sysfs_destroy(nn); 1196 nfs_cleanup_cb_ident_idr(net); 1197 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1198 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1199 } 1200 1201 #ifdef CONFIG_PROC_FS 1202 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1203 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1204 static void nfs_server_list_stop(struct seq_file *p, void *v); 1205 static int nfs_server_list_show(struct seq_file *m, void *v); 1206 1207 static const struct seq_operations nfs_server_list_ops = { 1208 .start = nfs_server_list_start, 1209 .next = nfs_server_list_next, 1210 .stop = nfs_server_list_stop, 1211 .show = nfs_server_list_show, 1212 }; 1213 1214 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1215 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1216 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1217 static int nfs_volume_list_show(struct seq_file *m, void *v); 1218 1219 static const struct seq_operations nfs_volume_list_ops = { 1220 .start = nfs_volume_list_start, 1221 .next = nfs_volume_list_next, 1222 .stop = nfs_volume_list_stop, 1223 .show = nfs_volume_list_show, 1224 }; 1225 1226 /* 1227 * set up the iterator to start reading from the server list and return the first item 1228 */ 1229 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1230 __acquires(&nn->nfs_client_lock) 1231 { 1232 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1233 1234 /* lock the list against modification */ 1235 spin_lock(&nn->nfs_client_lock); 1236 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1237 } 1238 1239 /* 1240 * move to next server 1241 */ 1242 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1243 { 1244 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1245 1246 return seq_list_next(v, &nn->nfs_client_list, pos); 1247 } 1248 1249 /* 1250 * clean up after reading from the transports list 1251 */ 1252 static void nfs_server_list_stop(struct seq_file *p, void *v) 1253 __releases(&nn->nfs_client_lock) 1254 { 1255 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1256 1257 spin_unlock(&nn->nfs_client_lock); 1258 } 1259 1260 /* 1261 * display a header line followed by a load of call lines 1262 */ 1263 static int nfs_server_list_show(struct seq_file *m, void *v) 1264 { 1265 struct nfs_client *clp; 1266 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1267 1268 /* display header on line 1 */ 1269 if (v == &nn->nfs_client_list) { 1270 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1271 return 0; 1272 } 1273 1274 /* display one transport per line on subsequent lines */ 1275 clp = list_entry(v, struct nfs_client, cl_share_link); 1276 1277 /* Check if the client is initialized */ 1278 if (clp->cl_cons_state != NFS_CS_READY) 1279 return 0; 1280 1281 rcu_read_lock(); 1282 seq_printf(m, "v%u %s %s %3d %s\n", 1283 clp->rpc_ops->version, 1284 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1285 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1286 refcount_read(&clp->cl_count), 1287 clp->cl_hostname); 1288 rcu_read_unlock(); 1289 1290 return 0; 1291 } 1292 1293 /* 1294 * set up the iterator to start reading from the volume list and return the first item 1295 */ 1296 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1297 __acquires(&nn->nfs_client_lock) 1298 { 1299 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1300 1301 /* lock the list against modification */ 1302 spin_lock(&nn->nfs_client_lock); 1303 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1304 } 1305 1306 /* 1307 * move to next volume 1308 */ 1309 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1310 { 1311 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1312 1313 return seq_list_next(v, &nn->nfs_volume_list, pos); 1314 } 1315 1316 /* 1317 * clean up after reading from the transports list 1318 */ 1319 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1320 __releases(&nn->nfs_client_lock) 1321 { 1322 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1323 1324 spin_unlock(&nn->nfs_client_lock); 1325 } 1326 1327 /* 1328 * display a header line followed by a load of call lines 1329 */ 1330 static int nfs_volume_list_show(struct seq_file *m, void *v) 1331 { 1332 struct nfs_server *server; 1333 struct nfs_client *clp; 1334 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1335 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1336 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1337 1338 /* display header on line 1 */ 1339 if (v == &nn->nfs_volume_list) { 1340 seq_puts(m, "NV SERVER PORT DEV FSID" 1341 " FSC\n"); 1342 return 0; 1343 } 1344 /* display one transport per line on subsequent lines */ 1345 server = list_entry(v, struct nfs_server, master_link); 1346 clp = server->nfs_client; 1347 1348 snprintf(dev, sizeof(dev), "%u:%u", 1349 MAJOR(server->s_dev), MINOR(server->s_dev)); 1350 1351 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1352 (unsigned long long) server->fsid.major, 1353 (unsigned long long) server->fsid.minor); 1354 1355 rcu_read_lock(); 1356 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1357 clp->rpc_ops->version, 1358 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1359 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1360 dev, 1361 fsid, 1362 nfs_server_fscache_state(server)); 1363 rcu_read_unlock(); 1364 1365 return 0; 1366 } 1367 1368 int nfs_fs_proc_net_init(struct net *net) 1369 { 1370 struct nfs_net *nn = net_generic(net, nfs_net_id); 1371 struct proc_dir_entry *p; 1372 1373 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1374 if (!nn->proc_nfsfs) 1375 goto error_0; 1376 1377 /* a file of servers with which we're dealing */ 1378 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1379 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1380 if (!p) 1381 goto error_1; 1382 1383 /* a file of volumes that we have mounted */ 1384 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1385 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1386 if (!p) 1387 goto error_1; 1388 return 0; 1389 1390 error_1: 1391 remove_proc_subtree("nfsfs", net->proc_net); 1392 error_0: 1393 return -ENOMEM; 1394 } 1395 1396 void nfs_fs_proc_net_exit(struct net *net) 1397 { 1398 remove_proc_subtree("nfsfs", net->proc_net); 1399 } 1400 1401 /* 1402 * initialise the /proc/fs/nfsfs/ directory 1403 */ 1404 int __init nfs_fs_proc_init(void) 1405 { 1406 if (!proc_mkdir("fs/nfsfs", NULL)) 1407 goto error_0; 1408 1409 /* a file of servers with which we're dealing */ 1410 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1411 goto error_1; 1412 1413 /* a file of volumes that we have mounted */ 1414 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1415 goto error_1; 1416 1417 return 0; 1418 error_1: 1419 remove_proc_subtree("fs/nfsfs", NULL); 1420 error_0: 1421 return -ENOMEM; 1422 } 1423 1424 /* 1425 * clean up the /proc/fs/nfsfs/ directory 1426 */ 1427 void nfs_fs_proc_exit(void) 1428 { 1429 remove_proc_subtree("fs/nfsfs", NULL); 1430 ida_destroy(&s_sysfs_ids); 1431 } 1432 1433 #endif /* CONFIG_PROC_FS */ 1434