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 struct rpc_stat nfs_rpcstat = { 80 .program = &nfs_program 81 }; 82 83 static struct nfs_subversion *find_nfs_version(unsigned int version) 84 { 85 struct nfs_subversion *nfs; 86 spin_lock(&nfs_version_lock); 87 88 list_for_each_entry(nfs, &nfs_versions, list) { 89 if (nfs->rpc_ops->version == version) { 90 spin_unlock(&nfs_version_lock); 91 return nfs; 92 } 93 } 94 95 spin_unlock(&nfs_version_lock); 96 return ERR_PTR(-EPROTONOSUPPORT); 97 } 98 99 struct nfs_subversion *get_nfs_version(unsigned int version) 100 { 101 struct nfs_subversion *nfs = find_nfs_version(version); 102 103 if (IS_ERR(nfs)) { 104 mutex_lock(&nfs_version_mutex); 105 request_module("nfsv%d", version); 106 nfs = find_nfs_version(version); 107 mutex_unlock(&nfs_version_mutex); 108 } 109 110 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 111 return ERR_PTR(-EAGAIN); 112 return nfs; 113 } 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 spin_lock(&nfs_version_lock); 123 124 list_add(&nfs->list, &nfs_versions); 125 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 126 127 spin_unlock(&nfs_version_lock); 128 } 129 EXPORT_SYMBOL_GPL(register_nfs_version); 130 131 void unregister_nfs_version(struct nfs_subversion *nfs) 132 { 133 spin_lock(&nfs_version_lock); 134 135 nfs_version[nfs->rpc_ops->version] = NULL; 136 list_del(&nfs->list); 137 138 spin_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 (!try_module_get(clp->cl_nfs_mod->owner)) 159 goto error_dealloc; 160 161 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 162 163 refcount_set(&clp->cl_count, 1); 164 clp->cl_cons_state = NFS_CS_INITING; 165 166 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 167 clp->cl_addrlen = cl_init->addrlen; 168 169 if (cl_init->hostname) { 170 err = -ENOMEM; 171 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 172 if (!clp->cl_hostname) 173 goto error_cleanup; 174 } 175 176 INIT_LIST_HEAD(&clp->cl_superblocks); 177 clp->cl_rpcclient = ERR_PTR(-EINVAL); 178 179 clp->cl_flags = cl_init->init_flags; 180 clp->cl_proto = cl_init->proto; 181 clp->cl_nconnect = cl_init->nconnect; 182 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; 183 clp->cl_net = get_net(cl_init->net); 184 185 clp->cl_principal = "*"; 186 clp->cl_xprtsec = cl_init->xprtsec; 187 return clp; 188 189 error_cleanup: 190 put_nfs_version(clp->cl_nfs_mod); 191 error_dealloc: 192 kfree(clp); 193 error_0: 194 return ERR_PTR(err); 195 } 196 EXPORT_SYMBOL_GPL(nfs_alloc_client); 197 198 #if IS_ENABLED(CONFIG_NFS_V4) 199 static void nfs_cleanup_cb_ident_idr(struct net *net) 200 { 201 struct nfs_net *nn = net_generic(net, nfs_net_id); 202 203 idr_destroy(&nn->cb_ident_idr); 204 } 205 206 /* nfs_client_lock held */ 207 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 208 { 209 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 210 211 if (clp->cl_cb_ident) 212 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 213 } 214 215 static void pnfs_init_server(struct nfs_server *server) 216 { 217 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 218 } 219 220 #else 221 static void nfs_cleanup_cb_ident_idr(struct net *net) 222 { 223 } 224 225 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 226 { 227 } 228 229 static void pnfs_init_server(struct nfs_server *server) 230 { 231 } 232 233 #endif /* CONFIG_NFS_V4 */ 234 235 /* 236 * Destroy a shared client record 237 */ 238 void nfs_free_client(struct nfs_client *clp) 239 { 240 /* -EIO all pending I/O */ 241 if (!IS_ERR(clp->cl_rpcclient)) 242 rpc_shutdown_client(clp->cl_rpcclient); 243 244 put_net(clp->cl_net); 245 put_nfs_version(clp->cl_nfs_mod); 246 kfree(clp->cl_hostname); 247 kfree(clp->cl_acceptor); 248 kfree(clp); 249 } 250 EXPORT_SYMBOL_GPL(nfs_free_client); 251 252 /* 253 * Release a reference to a shared client record 254 */ 255 void nfs_put_client(struct nfs_client *clp) 256 { 257 struct nfs_net *nn; 258 259 if (!clp) 260 return; 261 262 nn = net_generic(clp->cl_net, nfs_net_id); 263 264 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 265 list_del(&clp->cl_share_link); 266 nfs_cb_idr_remove_locked(clp); 267 spin_unlock(&nn->nfs_client_lock); 268 269 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 270 271 clp->rpc_ops->free_client(clp); 272 } 273 } 274 EXPORT_SYMBOL_GPL(nfs_put_client); 275 276 /* 277 * Find an nfs_client on the list that matches the initialisation data 278 * that is supplied. 279 */ 280 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 281 { 282 struct nfs_client *clp; 283 const struct sockaddr *sap = (struct sockaddr *)data->addr; 284 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 285 int error; 286 287 again: 288 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 289 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 290 /* Don't match clients that failed to initialise properly */ 291 if (clp->cl_cons_state < 0) 292 continue; 293 294 /* If a client is still initializing then we need to wait */ 295 if (clp->cl_cons_state > NFS_CS_READY) { 296 refcount_inc(&clp->cl_count); 297 spin_unlock(&nn->nfs_client_lock); 298 error = nfs_wait_client_init_complete(clp); 299 nfs_put_client(clp); 300 spin_lock(&nn->nfs_client_lock); 301 if (error < 0) 302 return ERR_PTR(error); 303 goto again; 304 } 305 306 /* Different NFS versions cannot share the same nfs_client */ 307 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 308 continue; 309 310 if (clp->cl_proto != data->proto) 311 continue; 312 /* Match nfsv4 minorversion */ 313 if (clp->cl_minorversion != data->minorversion) 314 continue; 315 316 /* Match request for a dedicated DS */ 317 if (test_bit(NFS_CS_DS, &data->init_flags) != 318 test_bit(NFS_CS_DS, &clp->cl_flags)) 319 continue; 320 321 /* Match the full socket address */ 322 if (!rpc_cmp_addr_port(sap, clap)) 323 /* Match all xprt_switch full socket addresses */ 324 if (IS_ERR(clp->cl_rpcclient) || 325 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 326 sap)) 327 continue; 328 329 /* Match the xprt security policy */ 330 if (clp->cl_xprtsec.policy != data->xprtsec.policy) 331 continue; 332 333 refcount_inc(&clp->cl_count); 334 return clp; 335 } 336 return NULL; 337 } 338 339 /* 340 * Return true if @clp is done initializing, false if still working on it. 341 * 342 * Use nfs_client_init_status to check if it was successful. 343 */ 344 bool nfs_client_init_is_complete(const struct nfs_client *clp) 345 { 346 return clp->cl_cons_state <= NFS_CS_READY; 347 } 348 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 349 350 /* 351 * Return 0 if @clp was successfully initialized, -errno otherwise. 352 * 353 * This must be called *after* nfs_client_init_is_complete() returns true, 354 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 355 */ 356 int nfs_client_init_status(const struct nfs_client *clp) 357 { 358 /* called without checking nfs_client_init_is_complete */ 359 if (clp->cl_cons_state > NFS_CS_READY) { 360 WARN_ON_ONCE(1); 361 return -EINVAL; 362 } 363 return clp->cl_cons_state; 364 } 365 EXPORT_SYMBOL_GPL(nfs_client_init_status); 366 367 int nfs_wait_client_init_complete(const struct nfs_client *clp) 368 { 369 return wait_event_killable(nfs_client_active_wq, 370 nfs_client_init_is_complete(clp)); 371 } 372 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 373 374 /* 375 * Found an existing client. Make sure it's ready before returning. 376 */ 377 static struct nfs_client * 378 nfs_found_client(const struct nfs_client_initdata *cl_init, 379 struct nfs_client *clp) 380 { 381 int error; 382 383 error = nfs_wait_client_init_complete(clp); 384 if (error < 0) { 385 nfs_put_client(clp); 386 return ERR_PTR(-ERESTARTSYS); 387 } 388 389 if (clp->cl_cons_state < NFS_CS_READY) { 390 error = clp->cl_cons_state; 391 nfs_put_client(clp); 392 return ERR_PTR(error); 393 } 394 395 smp_rmb(); 396 return clp; 397 } 398 399 /* 400 * Look up a client by IP address and protocol version 401 * - creates a new record if one doesn't yet exist 402 */ 403 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 404 { 405 struct nfs_client *clp, *new = NULL; 406 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 407 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 408 409 if (cl_init->hostname == NULL) { 410 WARN_ON(1); 411 return ERR_PTR(-EINVAL); 412 } 413 414 /* see if the client already exists */ 415 do { 416 spin_lock(&nn->nfs_client_lock); 417 418 clp = nfs_match_client(cl_init); 419 if (clp) { 420 spin_unlock(&nn->nfs_client_lock); 421 if (new) 422 new->rpc_ops->free_client(new); 423 if (IS_ERR(clp)) 424 return clp; 425 return nfs_found_client(cl_init, clp); 426 } 427 if (new) { 428 list_add_tail(&new->cl_share_link, 429 &nn->nfs_client_list); 430 spin_unlock(&nn->nfs_client_lock); 431 return rpc_ops->init_client(new, cl_init); 432 } 433 434 spin_unlock(&nn->nfs_client_lock); 435 436 new = rpc_ops->alloc_client(cl_init); 437 } while (!IS_ERR(new)); 438 439 return new; 440 } 441 EXPORT_SYMBOL_GPL(nfs_get_client); 442 443 /* 444 * Mark a server as ready or failed 445 */ 446 void nfs_mark_client_ready(struct nfs_client *clp, int state) 447 { 448 smp_wmb(); 449 clp->cl_cons_state = state; 450 wake_up_all(&nfs_client_active_wq); 451 } 452 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 453 454 /* 455 * Initialise the timeout values for a connection 456 */ 457 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 458 int timeo, int retrans) 459 { 460 to->to_initval = timeo * HZ / 10; 461 to->to_retries = retrans; 462 463 switch (proto) { 464 case XPRT_TRANSPORT_TCP: 465 case XPRT_TRANSPORT_TCP_TLS: 466 case XPRT_TRANSPORT_RDMA: 467 if (retrans == NFS_UNSPEC_RETRANS) 468 to->to_retries = NFS_DEF_TCP_RETRANS; 469 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 470 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 471 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 472 to->to_initval = NFS_MAX_TCP_TIMEOUT; 473 to->to_increment = to->to_initval; 474 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 475 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 476 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 477 if (to->to_maxval < to->to_initval) 478 to->to_maxval = to->to_initval; 479 to->to_exponential = 0; 480 break; 481 case XPRT_TRANSPORT_UDP: 482 if (retrans == NFS_UNSPEC_RETRANS) 483 to->to_retries = NFS_DEF_UDP_RETRANS; 484 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 485 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 486 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 487 to->to_initval = NFS_MAX_UDP_TIMEOUT; 488 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 489 to->to_exponential = 1; 490 break; 491 default: 492 BUG(); 493 } 494 } 495 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 496 497 /* 498 * Create an RPC client handle 499 */ 500 int nfs_create_rpc_client(struct nfs_client *clp, 501 const struct nfs_client_initdata *cl_init, 502 rpc_authflavor_t flavor) 503 { 504 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 505 struct rpc_clnt *clnt = NULL; 506 struct rpc_create_args args = { 507 .net = clp->cl_net, 508 .protocol = clp->cl_proto, 509 .nconnect = clp->cl_nconnect, 510 .address = (struct sockaddr *)&clp->cl_addr, 511 .addrsize = clp->cl_addrlen, 512 .timeout = cl_init->timeparms, 513 .servername = clp->cl_hostname, 514 .nodename = cl_init->nodename, 515 .program = &nfs_program, 516 .stats = &nn->rpcstats, 517 .version = clp->rpc_ops->version, 518 .authflavor = flavor, 519 .cred = cl_init->cred, 520 .xprtsec = cl_init->xprtsec, 521 .connect_timeout = cl_init->connect_timeout, 522 .reconnect_timeout = cl_init->reconnect_timeout, 523 }; 524 525 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 526 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 527 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 528 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 529 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 530 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 531 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 532 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 533 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 534 args.flags |= RPC_CLNT_CREATE_NOPING; 535 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 536 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 537 538 if (!IS_ERR(clp->cl_rpcclient)) 539 return 0; 540 541 clnt = rpc_create(&args); 542 if (IS_ERR(clnt)) { 543 dprintk("%s: cannot create RPC client. Error = %ld\n", 544 __func__, PTR_ERR(clnt)); 545 return PTR_ERR(clnt); 546 } 547 548 clnt->cl_principal = clp->cl_principal; 549 clp->cl_rpcclient = clnt; 550 clnt->cl_max_connect = clp->cl_max_connect; 551 return 0; 552 } 553 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 554 555 /* 556 * Version 2 or 3 client destruction 557 */ 558 static void nfs_destroy_server(struct nfs_server *server) 559 { 560 if (server->nlm_host) 561 nlmclnt_done(server->nlm_host); 562 } 563 564 /* 565 * Version 2 or 3 lockd setup 566 */ 567 static int nfs_start_lockd(struct nfs_server *server) 568 { 569 struct nlm_host *host; 570 struct nfs_client *clp = server->nfs_client; 571 struct nlmclnt_initdata nlm_init = { 572 .hostname = clp->cl_hostname, 573 .address = (struct sockaddr *)&clp->cl_addr, 574 .addrlen = clp->cl_addrlen, 575 .nfs_version = clp->rpc_ops->version, 576 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 577 1 : 0, 578 .net = clp->cl_net, 579 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 580 .cred = server->cred, 581 }; 582 583 if (nlm_init.nfs_version > 3) 584 return 0; 585 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 586 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 587 return 0; 588 589 switch (clp->cl_proto) { 590 default: 591 nlm_init.protocol = IPPROTO_TCP; 592 break; 593 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 594 case XPRT_TRANSPORT_UDP: 595 nlm_init.protocol = IPPROTO_UDP; 596 #endif 597 } 598 599 host = nlmclnt_init(&nlm_init); 600 if (IS_ERR(host)) 601 return PTR_ERR(host); 602 603 server->nlm_host = host; 604 server->destroy = nfs_destroy_server; 605 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 606 return 0; 607 } 608 609 /* 610 * Create a general RPC client 611 */ 612 int nfs_init_server_rpcclient(struct nfs_server *server, 613 const struct rpc_timeout *timeo, 614 rpc_authflavor_t pseudoflavour) 615 { 616 struct nfs_client *clp = server->nfs_client; 617 618 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 619 pseudoflavour); 620 if (IS_ERR(server->client)) { 621 dprintk("%s: couldn't create rpc_client!\n", __func__); 622 return PTR_ERR(server->client); 623 } 624 625 memcpy(&server->client->cl_timeout_default, 626 timeo, 627 sizeof(server->client->cl_timeout_default)); 628 server->client->cl_timeout = &server->client->cl_timeout_default; 629 server->client->cl_softrtry = 0; 630 if (server->flags & NFS_MOUNT_SOFTERR) 631 server->client->cl_softerr = 1; 632 if (server->flags & NFS_MOUNT_SOFT) 633 server->client->cl_softrtry = 1; 634 635 nfs_sysfs_link_rpc_client(server, server->client, NULL); 636 return 0; 637 } 638 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 639 640 /** 641 * nfs_init_client - Initialise an NFS2 or NFS3 client 642 * 643 * @clp: nfs_client to initialise 644 * @cl_init: Initialisation parameters 645 * 646 * Returns pointer to an NFS client, or an ERR_PTR value. 647 */ 648 struct nfs_client *nfs_init_client(struct nfs_client *clp, 649 const struct nfs_client_initdata *cl_init) 650 { 651 int error; 652 653 /* the client is already initialised */ 654 if (clp->cl_cons_state == NFS_CS_READY) 655 return clp; 656 657 /* 658 * Create a client RPC handle for doing FSSTAT with UNIX auth only 659 * - RFC 2623, sec 2.3.2 660 */ 661 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 662 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 663 if (error < 0) { 664 nfs_put_client(clp); 665 clp = ERR_PTR(error); 666 } 667 return clp; 668 } 669 EXPORT_SYMBOL_GPL(nfs_init_client); 670 671 /* 672 * Create a version 2 or 3 client 673 */ 674 static int nfs_init_server(struct nfs_server *server, 675 const struct fs_context *fc) 676 { 677 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 678 struct rpc_timeout timeparms; 679 struct nfs_client_initdata cl_init = { 680 .hostname = ctx->nfs_server.hostname, 681 .addr = &ctx->nfs_server._address, 682 .addrlen = ctx->nfs_server.addrlen, 683 .nfs_mod = ctx->nfs_mod, 684 .proto = ctx->nfs_server.protocol, 685 .net = fc->net_ns, 686 .timeparms = &timeparms, 687 .cred = server->cred, 688 .nconnect = ctx->nfs_server.nconnect, 689 .init_flags = (1UL << NFS_CS_REUSEPORT), 690 .xprtsec = ctx->xprtsec, 691 }; 692 struct nfs_client *clp; 693 int error; 694 695 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 696 ctx->timeo, ctx->retrans); 697 if (ctx->flags & NFS_MOUNT_NORESVPORT) 698 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 699 700 /* Allocate or find a client reference we can use */ 701 clp = nfs_get_client(&cl_init); 702 if (IS_ERR(clp)) 703 return PTR_ERR(clp); 704 705 server->nfs_client = clp; 706 nfs_sysfs_add_server(server); 707 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 708 709 /* Initialise the client representation from the mount data */ 710 server->flags = ctx->flags; 711 server->options = ctx->options; 712 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 713 714 switch (clp->rpc_ops->version) { 715 case 2: 716 server->fattr_valid = NFS_ATTR_FATTR_V2; 717 break; 718 case 3: 719 server->fattr_valid = NFS_ATTR_FATTR_V3; 720 break; 721 default: 722 server->fattr_valid = NFS_ATTR_FATTR_V4; 723 } 724 725 if (ctx->rsize) 726 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 727 if (ctx->wsize) 728 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 729 730 server->acregmin = ctx->acregmin * HZ; 731 server->acregmax = ctx->acregmax * HZ; 732 server->acdirmin = ctx->acdirmin * HZ; 733 server->acdirmax = ctx->acdirmax * HZ; 734 735 /* Start lockd here, before we might error out */ 736 error = nfs_start_lockd(server); 737 if (error < 0) 738 goto error; 739 740 server->port = ctx->nfs_server.port; 741 server->auth_info = ctx->auth_info; 742 743 error = nfs_init_server_rpcclient(server, &timeparms, 744 ctx->selected_flavor); 745 if (error < 0) 746 goto error; 747 748 /* Preserve the values of mount_server-related mount options */ 749 if (ctx->mount_server.addrlen) { 750 memcpy(&server->mountd_address, &ctx->mount_server.address, 751 ctx->mount_server.addrlen); 752 server->mountd_addrlen = ctx->mount_server.addrlen; 753 } 754 server->mountd_version = ctx->mount_server.version; 755 server->mountd_port = ctx->mount_server.port; 756 server->mountd_protocol = ctx->mount_server.protocol; 757 758 server->namelen = ctx->namlen; 759 return 0; 760 761 error: 762 server->nfs_client = NULL; 763 nfs_put_client(clp); 764 return error; 765 } 766 767 /* 768 * Load up the server record from information gained in an fsinfo record 769 */ 770 static void nfs_server_set_fsinfo(struct nfs_server *server, 771 struct nfs_fsinfo *fsinfo) 772 { 773 struct nfs_client *clp = server->nfs_client; 774 unsigned long max_rpc_payload, raw_max_rpc_payload; 775 776 /* Work out a lot of parameters */ 777 if (server->rsize == 0) 778 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 779 if (server->wsize == 0) 780 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 781 782 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 783 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 784 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 785 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 786 787 raw_max_rpc_payload = rpc_max_payload(server->client); 788 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 789 790 if (server->rsize > max_rpc_payload) 791 server->rsize = max_rpc_payload; 792 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 793 server->rsize = NFS_MAX_FILE_IO_SIZE; 794 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 795 796 if (server->wsize > max_rpc_payload) 797 server->wsize = max_rpc_payload; 798 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 799 server->wsize = NFS_MAX_FILE_IO_SIZE; 800 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 801 802 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 803 804 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 805 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 806 server->dtsize = NFS_MAX_FILE_IO_SIZE; 807 if (server->dtsize > server->rsize) 808 server->dtsize = server->rsize; 809 810 if (server->flags & NFS_MOUNT_NOAC) { 811 server->acregmin = server->acregmax = 0; 812 server->acdirmin = server->acdirmax = 0; 813 } 814 815 server->maxfilesize = fsinfo->maxfilesize; 816 817 server->time_delta = fsinfo->time_delta; 818 server->change_attr_type = fsinfo->change_attr_type; 819 820 server->clone_blksize = fsinfo->clone_blksize; 821 /* We're airborne Set socket buffersize */ 822 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 823 824 #ifdef CONFIG_NFS_V4_2 825 /* 826 * Defaults until limited by the session parameters. 827 */ 828 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 829 XATTR_SIZE_MAX); 830 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 831 XATTR_SIZE_MAX); 832 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 833 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 834 835 if (fsinfo->xattr_support) 836 server->caps |= NFS_CAP_XATTR; 837 #endif 838 } 839 840 /* 841 * Probe filesystem information, including the FSID on v2/v3 842 */ 843 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 844 { 845 struct nfs_fsinfo fsinfo; 846 struct nfs_client *clp = server->nfs_client; 847 int error; 848 849 if (clp->rpc_ops->set_capabilities != NULL) { 850 error = clp->rpc_ops->set_capabilities(server, mntfh); 851 if (error < 0) 852 return error; 853 } 854 855 fsinfo.fattr = fattr; 856 fsinfo.nlayouttypes = 0; 857 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 858 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 859 if (error < 0) 860 return error; 861 862 nfs_server_set_fsinfo(server, &fsinfo); 863 864 /* Get some general file system info */ 865 if (server->namelen == 0) { 866 struct nfs_pathconf pathinfo; 867 868 pathinfo.fattr = fattr; 869 nfs_fattr_init(fattr); 870 871 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 872 server->namelen = pathinfo.max_namelen; 873 } 874 875 if (clp->rpc_ops->discover_trunking != NULL && 876 (server->caps & NFS_CAP_FS_LOCATIONS && 877 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 878 error = clp->rpc_ops->discover_trunking(server, mntfh); 879 if (error < 0) 880 return error; 881 } 882 883 return 0; 884 } 885 886 /* 887 * Grab the destination's particulars, including lease expiry time. 888 * 889 * Returns zero if probe succeeded and retrieved FSID matches the FSID 890 * we have cached. 891 */ 892 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 893 { 894 struct nfs_fattr *fattr; 895 int error; 896 897 fattr = nfs_alloc_fattr(); 898 if (fattr == NULL) 899 return -ENOMEM; 900 901 /* Sanity: the probe won't work if the destination server 902 * does not recognize the migrated FH. */ 903 error = nfs_probe_fsinfo(server, mntfh, fattr); 904 905 nfs_free_fattr(fattr); 906 return error; 907 } 908 EXPORT_SYMBOL_GPL(nfs_probe_server); 909 910 /* 911 * Copy useful information when duplicating a server record 912 */ 913 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 914 { 915 target->flags = source->flags; 916 target->rsize = source->rsize; 917 target->wsize = source->wsize; 918 target->acregmin = source->acregmin; 919 target->acregmax = source->acregmax; 920 target->acdirmin = source->acdirmin; 921 target->acdirmax = source->acdirmax; 922 target->caps = source->caps; 923 target->options = source->options; 924 target->auth_info = source->auth_info; 925 target->port = source->port; 926 } 927 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 928 929 void nfs_server_insert_lists(struct nfs_server *server) 930 { 931 struct nfs_client *clp = server->nfs_client; 932 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 933 934 spin_lock(&nn->nfs_client_lock); 935 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 936 list_add_tail(&server->master_link, &nn->nfs_volume_list); 937 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 938 spin_unlock(&nn->nfs_client_lock); 939 940 } 941 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 942 943 void nfs_server_remove_lists(struct nfs_server *server) 944 { 945 struct nfs_client *clp = server->nfs_client; 946 struct nfs_net *nn; 947 948 if (clp == NULL) 949 return; 950 nn = net_generic(clp->cl_net, nfs_net_id); 951 spin_lock(&nn->nfs_client_lock); 952 list_del_rcu(&server->client_link); 953 if (list_empty(&clp->cl_superblocks)) 954 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 955 list_del(&server->master_link); 956 spin_unlock(&nn->nfs_client_lock); 957 958 synchronize_rcu(); 959 } 960 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 961 962 static DEFINE_IDA(s_sysfs_ids); 963 964 /* 965 * Allocate and initialise a server record 966 */ 967 struct nfs_server *nfs_alloc_server(void) 968 { 969 struct nfs_server *server; 970 971 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 972 if (!server) 973 return NULL; 974 975 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 976 if (server->s_sysfs_id < 0) { 977 kfree(server); 978 return NULL; 979 } 980 981 server->client = server->client_acl = ERR_PTR(-EINVAL); 982 983 /* Zero out the NFS state stuff */ 984 INIT_LIST_HEAD(&server->client_link); 985 INIT_LIST_HEAD(&server->master_link); 986 INIT_LIST_HEAD(&server->delegations); 987 INIT_LIST_HEAD(&server->layouts); 988 INIT_LIST_HEAD(&server->state_owners_lru); 989 INIT_LIST_HEAD(&server->ss_copies); 990 991 atomic_set(&server->active, 0); 992 993 server->io_stats = nfs_alloc_iostats(); 994 if (!server->io_stats) { 995 kfree(server); 996 return NULL; 997 } 998 999 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 1000 1001 ida_init(&server->openowner_id); 1002 ida_init(&server->lockowner_id); 1003 pnfs_init_server(server); 1004 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1005 1006 return server; 1007 } 1008 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1009 1010 /* 1011 * Free up a server record 1012 */ 1013 void nfs_free_server(struct nfs_server *server) 1014 { 1015 nfs_server_remove_lists(server); 1016 1017 if (server->destroy != NULL) 1018 server->destroy(server); 1019 1020 if (!IS_ERR(server->client_acl)) 1021 rpc_shutdown_client(server->client_acl); 1022 if (!IS_ERR(server->client)) 1023 rpc_shutdown_client(server->client); 1024 1025 nfs_put_client(server->nfs_client); 1026 1027 if (server->kobj.state_initialized) { 1028 nfs_sysfs_remove_server(server); 1029 kobject_put(&server->kobj); 1030 } 1031 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1032 1033 ida_destroy(&server->lockowner_id); 1034 ida_destroy(&server->openowner_id); 1035 nfs_free_iostats(server->io_stats); 1036 put_cred(server->cred); 1037 kfree(server); 1038 nfs_release_automount_timer(); 1039 } 1040 EXPORT_SYMBOL_GPL(nfs_free_server); 1041 1042 /* 1043 * Create a version 2 or 3 volume record 1044 * - keyed on server and FSID 1045 */ 1046 struct nfs_server *nfs_create_server(struct fs_context *fc) 1047 { 1048 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1049 struct nfs_server *server; 1050 struct nfs_fattr *fattr; 1051 int error; 1052 1053 server = nfs_alloc_server(); 1054 if (!server) 1055 return ERR_PTR(-ENOMEM); 1056 1057 server->cred = get_cred(fc->cred); 1058 1059 error = -ENOMEM; 1060 fattr = nfs_alloc_fattr(); 1061 if (fattr == NULL) 1062 goto error; 1063 1064 /* Get a client representation */ 1065 error = nfs_init_server(server, fc); 1066 if (error < 0) 1067 goto error; 1068 1069 /* Probe the root fh to retrieve its FSID */ 1070 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1071 if (error < 0) 1072 goto error; 1073 if (server->nfs_client->rpc_ops->version == 3) { 1074 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1075 server->namelen = NFS3_MAXNAMLEN; 1076 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1077 server->caps |= NFS_CAP_READDIRPLUS; 1078 } else { 1079 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1080 server->namelen = NFS2_MAXNAMLEN; 1081 } 1082 1083 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1084 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1085 fattr, NULL); 1086 if (error < 0) { 1087 dprintk("nfs_create_server: getattr error = %d\n", -error); 1088 goto error; 1089 } 1090 } 1091 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1092 1093 dprintk("Server FSID: %llx:%llx\n", 1094 (unsigned long long) server->fsid.major, 1095 (unsigned long long) server->fsid.minor); 1096 1097 nfs_server_insert_lists(server); 1098 server->mount_time = jiffies; 1099 nfs_free_fattr(fattr); 1100 return server; 1101 1102 error: 1103 nfs_free_fattr(fattr); 1104 nfs_free_server(server); 1105 return ERR_PTR(error); 1106 } 1107 EXPORT_SYMBOL_GPL(nfs_create_server); 1108 1109 /* 1110 * Clone an NFS2, NFS3 or NFS4 server record 1111 */ 1112 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1113 struct nfs_fh *fh, 1114 struct nfs_fattr *fattr, 1115 rpc_authflavor_t flavor) 1116 { 1117 struct nfs_server *server; 1118 int error; 1119 1120 server = nfs_alloc_server(); 1121 if (!server) 1122 return ERR_PTR(-ENOMEM); 1123 1124 server->cred = get_cred(source->cred); 1125 1126 /* Copy data from the source */ 1127 server->nfs_client = source->nfs_client; 1128 server->destroy = source->destroy; 1129 refcount_inc(&server->nfs_client->cl_count); 1130 nfs_server_copy_userdata(server, source); 1131 1132 server->fsid = fattr->fsid; 1133 1134 nfs_sysfs_add_server(server); 1135 1136 nfs_sysfs_link_rpc_client(server, 1137 server->nfs_client->cl_rpcclient, "_state"); 1138 1139 error = nfs_init_server_rpcclient(server, 1140 source->client->cl_timeout, 1141 flavor); 1142 if (error < 0) 1143 goto out_free_server; 1144 1145 /* probe the filesystem info for this server filesystem */ 1146 error = nfs_probe_server(server, fh); 1147 if (error < 0) 1148 goto out_free_server; 1149 1150 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1151 server->namelen = NFS4_MAXNAMLEN; 1152 1153 error = nfs_start_lockd(server); 1154 if (error < 0) 1155 goto out_free_server; 1156 1157 nfs_server_insert_lists(server); 1158 server->mount_time = jiffies; 1159 1160 return server; 1161 1162 out_free_server: 1163 nfs_free_server(server); 1164 return ERR_PTR(error); 1165 } 1166 EXPORT_SYMBOL_GPL(nfs_clone_server); 1167 1168 void nfs_clients_init(struct net *net) 1169 { 1170 struct nfs_net *nn = net_generic(net, nfs_net_id); 1171 1172 INIT_LIST_HEAD(&nn->nfs_client_list); 1173 INIT_LIST_HEAD(&nn->nfs_volume_list); 1174 #if IS_ENABLED(CONFIG_NFS_V4) 1175 idr_init(&nn->cb_ident_idr); 1176 #endif 1177 spin_lock_init(&nn->nfs_client_lock); 1178 nn->boot_time = ktime_get_real(); 1179 memset(&nn->rpcstats, 0, sizeof(nn->rpcstats)); 1180 nn->rpcstats.program = &nfs_program; 1181 1182 nfs_netns_sysfs_setup(nn, net); 1183 } 1184 1185 void nfs_clients_exit(struct net *net) 1186 { 1187 struct nfs_net *nn = net_generic(net, nfs_net_id); 1188 1189 nfs_netns_sysfs_destroy(nn); 1190 nfs_cleanup_cb_ident_idr(net); 1191 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1192 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1193 } 1194 1195 #ifdef CONFIG_PROC_FS 1196 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1197 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1198 static void nfs_server_list_stop(struct seq_file *p, void *v); 1199 static int nfs_server_list_show(struct seq_file *m, void *v); 1200 1201 static const struct seq_operations nfs_server_list_ops = { 1202 .start = nfs_server_list_start, 1203 .next = nfs_server_list_next, 1204 .stop = nfs_server_list_stop, 1205 .show = nfs_server_list_show, 1206 }; 1207 1208 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1209 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1210 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1211 static int nfs_volume_list_show(struct seq_file *m, void *v); 1212 1213 static const struct seq_operations nfs_volume_list_ops = { 1214 .start = nfs_volume_list_start, 1215 .next = nfs_volume_list_next, 1216 .stop = nfs_volume_list_stop, 1217 .show = nfs_volume_list_show, 1218 }; 1219 1220 /* 1221 * set up the iterator to start reading from the server list and return the first item 1222 */ 1223 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1224 __acquires(&nn->nfs_client_lock) 1225 { 1226 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1227 1228 /* lock the list against modification */ 1229 spin_lock(&nn->nfs_client_lock); 1230 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1231 } 1232 1233 /* 1234 * move to next server 1235 */ 1236 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1237 { 1238 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1239 1240 return seq_list_next(v, &nn->nfs_client_list, pos); 1241 } 1242 1243 /* 1244 * clean up after reading from the transports list 1245 */ 1246 static void nfs_server_list_stop(struct seq_file *p, void *v) 1247 __releases(&nn->nfs_client_lock) 1248 { 1249 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1250 1251 spin_unlock(&nn->nfs_client_lock); 1252 } 1253 1254 /* 1255 * display a header line followed by a load of call lines 1256 */ 1257 static int nfs_server_list_show(struct seq_file *m, void *v) 1258 { 1259 struct nfs_client *clp; 1260 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1261 1262 /* display header on line 1 */ 1263 if (v == &nn->nfs_client_list) { 1264 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1265 return 0; 1266 } 1267 1268 /* display one transport per line on subsequent lines */ 1269 clp = list_entry(v, struct nfs_client, cl_share_link); 1270 1271 /* Check if the client is initialized */ 1272 if (clp->cl_cons_state != NFS_CS_READY) 1273 return 0; 1274 1275 rcu_read_lock(); 1276 seq_printf(m, "v%u %s %s %3d %s\n", 1277 clp->rpc_ops->version, 1278 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1279 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1280 refcount_read(&clp->cl_count), 1281 clp->cl_hostname); 1282 rcu_read_unlock(); 1283 1284 return 0; 1285 } 1286 1287 /* 1288 * set up the iterator to start reading from the volume list and return the first item 1289 */ 1290 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1291 __acquires(&nn->nfs_client_lock) 1292 { 1293 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1294 1295 /* lock the list against modification */ 1296 spin_lock(&nn->nfs_client_lock); 1297 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1298 } 1299 1300 /* 1301 * move to next volume 1302 */ 1303 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1304 { 1305 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1306 1307 return seq_list_next(v, &nn->nfs_volume_list, pos); 1308 } 1309 1310 /* 1311 * clean up after reading from the transports list 1312 */ 1313 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1314 __releases(&nn->nfs_client_lock) 1315 { 1316 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1317 1318 spin_unlock(&nn->nfs_client_lock); 1319 } 1320 1321 /* 1322 * display a header line followed by a load of call lines 1323 */ 1324 static int nfs_volume_list_show(struct seq_file *m, void *v) 1325 { 1326 struct nfs_server *server; 1327 struct nfs_client *clp; 1328 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1329 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1330 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1331 1332 /* display header on line 1 */ 1333 if (v == &nn->nfs_volume_list) { 1334 seq_puts(m, "NV SERVER PORT DEV FSID" 1335 " FSC\n"); 1336 return 0; 1337 } 1338 /* display one transport per line on subsequent lines */ 1339 server = list_entry(v, struct nfs_server, master_link); 1340 clp = server->nfs_client; 1341 1342 snprintf(dev, sizeof(dev), "%u:%u", 1343 MAJOR(server->s_dev), MINOR(server->s_dev)); 1344 1345 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1346 (unsigned long long) server->fsid.major, 1347 (unsigned long long) server->fsid.minor); 1348 1349 rcu_read_lock(); 1350 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1351 clp->rpc_ops->version, 1352 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1353 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1354 dev, 1355 fsid, 1356 nfs_server_fscache_state(server)); 1357 rcu_read_unlock(); 1358 1359 return 0; 1360 } 1361 1362 int nfs_fs_proc_net_init(struct net *net) 1363 { 1364 struct nfs_net *nn = net_generic(net, nfs_net_id); 1365 struct proc_dir_entry *p; 1366 1367 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1368 if (!nn->proc_nfsfs) 1369 goto error_0; 1370 1371 /* a file of servers with which we're dealing */ 1372 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1373 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1374 if (!p) 1375 goto error_1; 1376 1377 /* a file of volumes that we have mounted */ 1378 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1379 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1380 if (!p) 1381 goto error_1; 1382 return 0; 1383 1384 error_1: 1385 remove_proc_subtree("nfsfs", net->proc_net); 1386 error_0: 1387 return -ENOMEM; 1388 } 1389 1390 void nfs_fs_proc_net_exit(struct net *net) 1391 { 1392 remove_proc_subtree("nfsfs", net->proc_net); 1393 } 1394 1395 /* 1396 * initialise the /proc/fs/nfsfs/ directory 1397 */ 1398 int __init nfs_fs_proc_init(void) 1399 { 1400 if (!proc_mkdir("fs/nfsfs", NULL)) 1401 goto error_0; 1402 1403 /* a file of servers with which we're dealing */ 1404 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1405 goto error_1; 1406 1407 /* a file of volumes that we have mounted */ 1408 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1409 goto error_1; 1410 1411 return 0; 1412 error_1: 1413 remove_proc_subtree("fs/nfsfs", NULL); 1414 error_0: 1415 return -ENOMEM; 1416 } 1417 1418 /* 1419 * clean up the /proc/fs/nfsfs/ directory 1420 */ 1421 void nfs_fs_proc_exit(void) 1422 { 1423 remove_proc_subtree("fs/nfsfs", NULL); 1424 ida_destroy(&s_sysfs_ids); 1425 } 1426 1427 #endif /* CONFIG_PROC_FS */ 1428