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 .stats = &nfs_rpcstat, 77 .pipe_dir_name = NFS_PIPE_DIRNAME, 78 }; 79 80 struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82 }; 83 84 static struct nfs_subversion *find_nfs_version(unsigned int version) 85 { 86 struct nfs_subversion *nfs; 87 spin_lock(&nfs_version_lock); 88 89 list_for_each_entry(nfs, &nfs_versions, list) { 90 if (nfs->rpc_ops->version == version) { 91 spin_unlock(&nfs_version_lock); 92 return nfs; 93 } 94 } 95 96 spin_unlock(&nfs_version_lock); 97 return ERR_PTR(-EPROTONOSUPPORT); 98 } 99 100 struct nfs_subversion *get_nfs_version(unsigned int version) 101 { 102 struct nfs_subversion *nfs = find_nfs_version(version); 103 104 if (IS_ERR(nfs)) { 105 mutex_lock(&nfs_version_mutex); 106 request_module("nfsv%d", version); 107 nfs = find_nfs_version(version); 108 mutex_unlock(&nfs_version_mutex); 109 } 110 111 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 112 return ERR_PTR(-EAGAIN); 113 return nfs; 114 } 115 116 void put_nfs_version(struct nfs_subversion *nfs) 117 { 118 module_put(nfs->owner); 119 } 120 121 void register_nfs_version(struct nfs_subversion *nfs) 122 { 123 spin_lock(&nfs_version_lock); 124 125 list_add(&nfs->list, &nfs_versions); 126 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 127 128 spin_unlock(&nfs_version_lock); 129 } 130 EXPORT_SYMBOL_GPL(register_nfs_version); 131 132 void unregister_nfs_version(struct nfs_subversion *nfs) 133 { 134 spin_lock(&nfs_version_lock); 135 136 nfs_version[nfs->rpc_ops->version] = NULL; 137 list_del(&nfs->list); 138 139 spin_unlock(&nfs_version_lock); 140 } 141 EXPORT_SYMBOL_GPL(unregister_nfs_version); 142 143 /* 144 * Allocate a shared client record 145 * 146 * Since these are allocated/deallocated very rarely, we don't 147 * bother putting them in a slab cache... 148 */ 149 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 150 { 151 struct nfs_client *clp; 152 int err = -ENOMEM; 153 154 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 155 goto error_0; 156 157 clp->cl_minorversion = cl_init->minorversion; 158 clp->cl_nfs_mod = cl_init->nfs_mod; 159 if (!try_module_get(clp->cl_nfs_mod->owner)) 160 goto error_dealloc; 161 162 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 163 164 refcount_set(&clp->cl_count, 1); 165 clp->cl_cons_state = NFS_CS_INITING; 166 167 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 168 clp->cl_addrlen = cl_init->addrlen; 169 170 if (cl_init->hostname) { 171 err = -ENOMEM; 172 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 173 if (!clp->cl_hostname) 174 goto error_cleanup; 175 } 176 177 INIT_LIST_HEAD(&clp->cl_superblocks); 178 clp->cl_rpcclient = ERR_PTR(-EINVAL); 179 180 clp->cl_flags = cl_init->init_flags; 181 clp->cl_proto = cl_init->proto; 182 clp->cl_nconnect = cl_init->nconnect; 183 clp->cl_max_connect = cl_init->max_connect ? cl_init->max_connect : 1; 184 clp->cl_net = get_net(cl_init->net); 185 186 clp->cl_principal = "*"; 187 clp->cl_xprtsec = cl_init->xprtsec; 188 return clp; 189 190 error_cleanup: 191 put_nfs_version(clp->cl_nfs_mod); 192 error_dealloc: 193 kfree(clp); 194 error_0: 195 return ERR_PTR(err); 196 } 197 EXPORT_SYMBOL_GPL(nfs_alloc_client); 198 199 #if IS_ENABLED(CONFIG_NFS_V4) 200 static void nfs_cleanup_cb_ident_idr(struct net *net) 201 { 202 struct nfs_net *nn = net_generic(net, nfs_net_id); 203 204 idr_destroy(&nn->cb_ident_idr); 205 } 206 207 /* nfs_client_lock held */ 208 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 209 { 210 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 211 212 if (clp->cl_cb_ident) 213 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 214 } 215 216 static void pnfs_init_server(struct nfs_server *server) 217 { 218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 219 } 220 221 #else 222 static void nfs_cleanup_cb_ident_idr(struct net *net) 223 { 224 } 225 226 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 227 { 228 } 229 230 static void pnfs_init_server(struct nfs_server *server) 231 { 232 } 233 234 #endif /* CONFIG_NFS_V4 */ 235 236 /* 237 * Destroy a shared client record 238 */ 239 void nfs_free_client(struct nfs_client *clp) 240 { 241 /* -EIO all pending I/O */ 242 if (!IS_ERR(clp->cl_rpcclient)) 243 rpc_shutdown_client(clp->cl_rpcclient); 244 245 put_net(clp->cl_net); 246 put_nfs_version(clp->cl_nfs_mod); 247 kfree(clp->cl_hostname); 248 kfree(clp->cl_acceptor); 249 kfree(clp); 250 } 251 EXPORT_SYMBOL_GPL(nfs_free_client); 252 253 /* 254 * Release a reference to a shared client record 255 */ 256 void nfs_put_client(struct nfs_client *clp) 257 { 258 struct nfs_net *nn; 259 260 if (!clp) 261 return; 262 263 nn = net_generic(clp->cl_net, nfs_net_id); 264 265 if (refcount_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 266 list_del(&clp->cl_share_link); 267 nfs_cb_idr_remove_locked(clp); 268 spin_unlock(&nn->nfs_client_lock); 269 270 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 271 272 clp->rpc_ops->free_client(clp); 273 } 274 } 275 EXPORT_SYMBOL_GPL(nfs_put_client); 276 277 /* 278 * Find an nfs_client on the list that matches the initialisation data 279 * that is supplied. 280 */ 281 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 282 { 283 struct nfs_client *clp; 284 const struct sockaddr *sap = (struct sockaddr *)data->addr; 285 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 286 int error; 287 288 again: 289 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 290 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 291 /* Don't match clients that failed to initialise properly */ 292 if (clp->cl_cons_state < 0) 293 continue; 294 295 /* If a client is still initializing then we need to wait */ 296 if (clp->cl_cons_state > NFS_CS_READY) { 297 refcount_inc(&clp->cl_count); 298 spin_unlock(&nn->nfs_client_lock); 299 error = nfs_wait_client_init_complete(clp); 300 nfs_put_client(clp); 301 spin_lock(&nn->nfs_client_lock); 302 if (error < 0) 303 return ERR_PTR(error); 304 goto again; 305 } 306 307 /* Different NFS versions cannot share the same nfs_client */ 308 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 309 continue; 310 311 if (clp->cl_proto != data->proto) 312 continue; 313 /* Match nfsv4 minorversion */ 314 if (clp->cl_minorversion != data->minorversion) 315 continue; 316 317 /* Match request for a dedicated DS */ 318 if (test_bit(NFS_CS_DS, &data->init_flags) != 319 test_bit(NFS_CS_DS, &clp->cl_flags)) 320 continue; 321 322 /* Match the full socket address */ 323 if (!rpc_cmp_addr_port(sap, clap)) 324 /* Match all xprt_switch full socket addresses */ 325 if (IS_ERR(clp->cl_rpcclient) || 326 !rpc_clnt_xprt_switch_has_addr(clp->cl_rpcclient, 327 sap)) 328 continue; 329 330 /* Match the xprt security policy */ 331 if (clp->cl_xprtsec.policy != data->xprtsec.policy) 332 continue; 333 334 refcount_inc(&clp->cl_count); 335 return clp; 336 } 337 return NULL; 338 } 339 340 /* 341 * Return true if @clp is done initializing, false if still working on it. 342 * 343 * Use nfs_client_init_status to check if it was successful. 344 */ 345 bool nfs_client_init_is_complete(const struct nfs_client *clp) 346 { 347 return clp->cl_cons_state <= NFS_CS_READY; 348 } 349 EXPORT_SYMBOL_GPL(nfs_client_init_is_complete); 350 351 /* 352 * Return 0 if @clp was successfully initialized, -errno otherwise. 353 * 354 * This must be called *after* nfs_client_init_is_complete() returns true, 355 * otherwise it will pop WARN_ON_ONCE and return -EINVAL 356 */ 357 int nfs_client_init_status(const struct nfs_client *clp) 358 { 359 /* called without checking nfs_client_init_is_complete */ 360 if (clp->cl_cons_state > NFS_CS_READY) { 361 WARN_ON_ONCE(1); 362 return -EINVAL; 363 } 364 return clp->cl_cons_state; 365 } 366 EXPORT_SYMBOL_GPL(nfs_client_init_status); 367 368 int nfs_wait_client_init_complete(const struct nfs_client *clp) 369 { 370 return wait_event_killable(nfs_client_active_wq, 371 nfs_client_init_is_complete(clp)); 372 } 373 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 374 375 /* 376 * Found an existing client. Make sure it's ready before returning. 377 */ 378 static struct nfs_client * 379 nfs_found_client(const struct nfs_client_initdata *cl_init, 380 struct nfs_client *clp) 381 { 382 int error; 383 384 error = nfs_wait_client_init_complete(clp); 385 if (error < 0) { 386 nfs_put_client(clp); 387 return ERR_PTR(-ERESTARTSYS); 388 } 389 390 if (clp->cl_cons_state < NFS_CS_READY) { 391 error = clp->cl_cons_state; 392 nfs_put_client(clp); 393 return ERR_PTR(error); 394 } 395 396 smp_rmb(); 397 return clp; 398 } 399 400 /* 401 * Look up a client by IP address and protocol version 402 * - creates a new record if one doesn't yet exist 403 */ 404 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 405 { 406 struct nfs_client *clp, *new = NULL; 407 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 408 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 409 410 if (cl_init->hostname == NULL) { 411 WARN_ON(1); 412 return ERR_PTR(-EINVAL); 413 } 414 415 /* see if the client already exists */ 416 do { 417 spin_lock(&nn->nfs_client_lock); 418 419 clp = nfs_match_client(cl_init); 420 if (clp) { 421 spin_unlock(&nn->nfs_client_lock); 422 if (new) 423 new->rpc_ops->free_client(new); 424 if (IS_ERR(clp)) 425 return clp; 426 return nfs_found_client(cl_init, clp); 427 } 428 if (new) { 429 list_add_tail(&new->cl_share_link, 430 &nn->nfs_client_list); 431 spin_unlock(&nn->nfs_client_lock); 432 return rpc_ops->init_client(new, cl_init); 433 } 434 435 spin_unlock(&nn->nfs_client_lock); 436 437 new = rpc_ops->alloc_client(cl_init); 438 } while (!IS_ERR(new)); 439 440 return new; 441 } 442 EXPORT_SYMBOL_GPL(nfs_get_client); 443 444 /* 445 * Mark a server as ready or failed 446 */ 447 void nfs_mark_client_ready(struct nfs_client *clp, int state) 448 { 449 smp_wmb(); 450 clp->cl_cons_state = state; 451 wake_up_all(&nfs_client_active_wq); 452 } 453 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 454 455 /* 456 * Initialise the timeout values for a connection 457 */ 458 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 459 int timeo, int retrans) 460 { 461 to->to_initval = timeo * HZ / 10; 462 to->to_retries = retrans; 463 464 switch (proto) { 465 case XPRT_TRANSPORT_TCP: 466 case XPRT_TRANSPORT_TCP_TLS: 467 case XPRT_TRANSPORT_RDMA: 468 if (retrans == NFS_UNSPEC_RETRANS) 469 to->to_retries = NFS_DEF_TCP_RETRANS; 470 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 471 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 472 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 473 to->to_initval = NFS_MAX_TCP_TIMEOUT; 474 to->to_increment = to->to_initval; 475 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 476 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 477 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 478 if (to->to_maxval < to->to_initval) 479 to->to_maxval = to->to_initval; 480 to->to_exponential = 0; 481 break; 482 case XPRT_TRANSPORT_UDP: 483 if (retrans == NFS_UNSPEC_RETRANS) 484 to->to_retries = NFS_DEF_UDP_RETRANS; 485 if (timeo == NFS_UNSPEC_TIMEO || to->to_initval == 0) 486 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 487 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 488 to->to_initval = NFS_MAX_UDP_TIMEOUT; 489 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 490 to->to_exponential = 1; 491 break; 492 default: 493 BUG(); 494 } 495 } 496 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 497 498 /* 499 * Create an RPC client handle 500 */ 501 int nfs_create_rpc_client(struct nfs_client *clp, 502 const struct nfs_client_initdata *cl_init, 503 rpc_authflavor_t flavor) 504 { 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 .version = clp->rpc_ops->version, 517 .authflavor = flavor, 518 .cred = cl_init->cred, 519 .xprtsec = cl_init->xprtsec, 520 }; 521 522 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 523 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 524 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 525 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 526 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 527 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 528 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 529 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 530 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 531 args.flags |= RPC_CLNT_CREATE_NOPING; 532 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 533 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 534 535 if (!IS_ERR(clp->cl_rpcclient)) 536 return 0; 537 538 clnt = rpc_create(&args); 539 if (IS_ERR(clnt)) { 540 dprintk("%s: cannot create RPC client. Error = %ld\n", 541 __func__, PTR_ERR(clnt)); 542 return PTR_ERR(clnt); 543 } 544 545 clnt->cl_principal = clp->cl_principal; 546 clp->cl_rpcclient = clnt; 547 clnt->cl_max_connect = clp->cl_max_connect; 548 return 0; 549 } 550 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 551 552 /* 553 * Version 2 or 3 client destruction 554 */ 555 static void nfs_destroy_server(struct nfs_server *server) 556 { 557 if (server->nlm_host) 558 nlmclnt_done(server->nlm_host); 559 } 560 561 /* 562 * Version 2 or 3 lockd setup 563 */ 564 static int nfs_start_lockd(struct nfs_server *server) 565 { 566 struct nlm_host *host; 567 struct nfs_client *clp = server->nfs_client; 568 struct nlmclnt_initdata nlm_init = { 569 .hostname = clp->cl_hostname, 570 .address = (struct sockaddr *)&clp->cl_addr, 571 .addrlen = clp->cl_addrlen, 572 .nfs_version = clp->rpc_ops->version, 573 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 574 1 : 0, 575 .net = clp->cl_net, 576 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 577 .cred = server->cred, 578 }; 579 580 if (nlm_init.nfs_version > 3) 581 return 0; 582 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 583 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 584 return 0; 585 586 switch (clp->cl_proto) { 587 default: 588 nlm_init.protocol = IPPROTO_TCP; 589 break; 590 #ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 591 case XPRT_TRANSPORT_UDP: 592 nlm_init.protocol = IPPROTO_UDP; 593 #endif 594 } 595 596 host = nlmclnt_init(&nlm_init); 597 if (IS_ERR(host)) 598 return PTR_ERR(host); 599 600 server->nlm_host = host; 601 server->destroy = nfs_destroy_server; 602 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 603 return 0; 604 } 605 606 /* 607 * Create a general RPC client 608 */ 609 int nfs_init_server_rpcclient(struct nfs_server *server, 610 const struct rpc_timeout *timeo, 611 rpc_authflavor_t pseudoflavour) 612 { 613 struct nfs_client *clp = server->nfs_client; 614 615 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 616 pseudoflavour); 617 if (IS_ERR(server->client)) { 618 dprintk("%s: couldn't create rpc_client!\n", __func__); 619 return PTR_ERR(server->client); 620 } 621 622 memcpy(&server->client->cl_timeout_default, 623 timeo, 624 sizeof(server->client->cl_timeout_default)); 625 server->client->cl_timeout = &server->client->cl_timeout_default; 626 server->client->cl_softrtry = 0; 627 if (server->flags & NFS_MOUNT_SOFTERR) 628 server->client->cl_softerr = 1; 629 if (server->flags & NFS_MOUNT_SOFT) 630 server->client->cl_softrtry = 1; 631 632 nfs_sysfs_link_rpc_client(server, server->client, NULL); 633 return 0; 634 } 635 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 636 637 /** 638 * nfs_init_client - Initialise an NFS2 or NFS3 client 639 * 640 * @clp: nfs_client to initialise 641 * @cl_init: Initialisation parameters 642 * 643 * Returns pointer to an NFS client, or an ERR_PTR value. 644 */ 645 struct nfs_client *nfs_init_client(struct nfs_client *clp, 646 const struct nfs_client_initdata *cl_init) 647 { 648 int error; 649 650 /* the client is already initialised */ 651 if (clp->cl_cons_state == NFS_CS_READY) 652 return clp; 653 654 /* 655 * Create a client RPC handle for doing FSSTAT with UNIX auth only 656 * - RFC 2623, sec 2.3.2 657 */ 658 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 659 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 660 if (error < 0) { 661 nfs_put_client(clp); 662 clp = ERR_PTR(error); 663 } 664 return clp; 665 } 666 EXPORT_SYMBOL_GPL(nfs_init_client); 667 668 /* 669 * Create a version 2 or 3 client 670 */ 671 static int nfs_init_server(struct nfs_server *server, 672 const struct fs_context *fc) 673 { 674 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 675 struct rpc_timeout timeparms; 676 struct nfs_client_initdata cl_init = { 677 .hostname = ctx->nfs_server.hostname, 678 .addr = &ctx->nfs_server._address, 679 .addrlen = ctx->nfs_server.addrlen, 680 .nfs_mod = ctx->nfs_mod, 681 .proto = ctx->nfs_server.protocol, 682 .net = fc->net_ns, 683 .timeparms = &timeparms, 684 .cred = server->cred, 685 .nconnect = ctx->nfs_server.nconnect, 686 .init_flags = (1UL << NFS_CS_REUSEPORT), 687 .xprtsec = ctx->xprtsec, 688 }; 689 struct nfs_client *clp; 690 int error; 691 692 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 693 ctx->timeo, ctx->retrans); 694 if (ctx->flags & NFS_MOUNT_NORESVPORT) 695 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 696 697 /* Allocate or find a client reference we can use */ 698 clp = nfs_get_client(&cl_init); 699 if (IS_ERR(clp)) 700 return PTR_ERR(clp); 701 702 server->nfs_client = clp; 703 nfs_sysfs_add_server(server); 704 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 705 706 /* Initialise the client representation from the mount data */ 707 server->flags = ctx->flags; 708 server->options = ctx->options; 709 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 710 711 switch (clp->rpc_ops->version) { 712 case 2: 713 server->fattr_valid = NFS_ATTR_FATTR_V2; 714 break; 715 case 3: 716 server->fattr_valid = NFS_ATTR_FATTR_V3; 717 break; 718 default: 719 server->fattr_valid = NFS_ATTR_FATTR_V4; 720 } 721 722 if (ctx->rsize) 723 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 724 if (ctx->wsize) 725 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 726 727 server->acregmin = ctx->acregmin * HZ; 728 server->acregmax = ctx->acregmax * HZ; 729 server->acdirmin = ctx->acdirmin * HZ; 730 server->acdirmax = ctx->acdirmax * HZ; 731 732 /* Start lockd here, before we might error out */ 733 error = nfs_start_lockd(server); 734 if (error < 0) 735 goto error; 736 737 server->port = ctx->nfs_server.port; 738 server->auth_info = ctx->auth_info; 739 740 error = nfs_init_server_rpcclient(server, &timeparms, 741 ctx->selected_flavor); 742 if (error < 0) 743 goto error; 744 745 /* Preserve the values of mount_server-related mount options */ 746 if (ctx->mount_server.addrlen) { 747 memcpy(&server->mountd_address, &ctx->mount_server.address, 748 ctx->mount_server.addrlen); 749 server->mountd_addrlen = ctx->mount_server.addrlen; 750 } 751 server->mountd_version = ctx->mount_server.version; 752 server->mountd_port = ctx->mount_server.port; 753 server->mountd_protocol = ctx->mount_server.protocol; 754 755 server->namelen = ctx->namlen; 756 return 0; 757 758 error: 759 server->nfs_client = NULL; 760 nfs_put_client(clp); 761 return error; 762 } 763 764 /* 765 * Load up the server record from information gained in an fsinfo record 766 */ 767 static void nfs_server_set_fsinfo(struct nfs_server *server, 768 struct nfs_fsinfo *fsinfo) 769 { 770 struct nfs_client *clp = server->nfs_client; 771 unsigned long max_rpc_payload, raw_max_rpc_payload; 772 773 /* Work out a lot of parameters */ 774 if (server->rsize == 0) 775 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 776 if (server->wsize == 0) 777 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 778 779 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 780 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 781 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 782 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 783 784 raw_max_rpc_payload = rpc_max_payload(server->client); 785 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 786 787 if (server->rsize > max_rpc_payload) 788 server->rsize = max_rpc_payload; 789 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 790 server->rsize = NFS_MAX_FILE_IO_SIZE; 791 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 792 793 if (server->wsize > max_rpc_payload) 794 server->wsize = max_rpc_payload; 795 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 796 server->wsize = NFS_MAX_FILE_IO_SIZE; 797 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 798 799 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 800 801 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 802 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 803 server->dtsize = NFS_MAX_FILE_IO_SIZE; 804 if (server->dtsize > server->rsize) 805 server->dtsize = server->rsize; 806 807 if (server->flags & NFS_MOUNT_NOAC) { 808 server->acregmin = server->acregmax = 0; 809 server->acdirmin = server->acdirmax = 0; 810 } 811 812 server->maxfilesize = fsinfo->maxfilesize; 813 814 server->time_delta = fsinfo->time_delta; 815 server->change_attr_type = fsinfo->change_attr_type; 816 817 server->clone_blksize = fsinfo->clone_blksize; 818 /* We're airborne Set socket buffersize */ 819 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 820 821 #ifdef CONFIG_NFS_V4_2 822 /* 823 * Defaults until limited by the session parameters. 824 */ 825 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 826 XATTR_SIZE_MAX); 827 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 828 XATTR_SIZE_MAX); 829 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 830 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 831 832 if (fsinfo->xattr_support) 833 server->caps |= NFS_CAP_XATTR; 834 #endif 835 } 836 837 /* 838 * Probe filesystem information, including the FSID on v2/v3 839 */ 840 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 841 { 842 struct nfs_fsinfo fsinfo; 843 struct nfs_client *clp = server->nfs_client; 844 int error; 845 846 if (clp->rpc_ops->set_capabilities != NULL) { 847 error = clp->rpc_ops->set_capabilities(server, mntfh); 848 if (error < 0) 849 return error; 850 } 851 852 fsinfo.fattr = fattr; 853 fsinfo.nlayouttypes = 0; 854 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 855 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 856 if (error < 0) 857 return error; 858 859 nfs_server_set_fsinfo(server, &fsinfo); 860 861 /* Get some general file system info */ 862 if (server->namelen == 0) { 863 struct nfs_pathconf pathinfo; 864 865 pathinfo.fattr = fattr; 866 nfs_fattr_init(fattr); 867 868 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 869 server->namelen = pathinfo.max_namelen; 870 } 871 872 if (clp->rpc_ops->discover_trunking != NULL && 873 (server->caps & NFS_CAP_FS_LOCATIONS && 874 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 875 error = clp->rpc_ops->discover_trunking(server, mntfh); 876 if (error < 0) 877 return error; 878 } 879 880 return 0; 881 } 882 883 /* 884 * Grab the destination's particulars, including lease expiry time. 885 * 886 * Returns zero if probe succeeded and retrieved FSID matches the FSID 887 * we have cached. 888 */ 889 int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 890 { 891 struct nfs_fattr *fattr; 892 int error; 893 894 fattr = nfs_alloc_fattr(); 895 if (fattr == NULL) 896 return -ENOMEM; 897 898 /* Sanity: the probe won't work if the destination server 899 * does not recognize the migrated FH. */ 900 error = nfs_probe_fsinfo(server, mntfh, fattr); 901 902 nfs_free_fattr(fattr); 903 return error; 904 } 905 EXPORT_SYMBOL_GPL(nfs_probe_server); 906 907 /* 908 * Copy useful information when duplicating a server record 909 */ 910 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 911 { 912 target->flags = source->flags; 913 target->rsize = source->rsize; 914 target->wsize = source->wsize; 915 target->acregmin = source->acregmin; 916 target->acregmax = source->acregmax; 917 target->acdirmin = source->acdirmin; 918 target->acdirmax = source->acdirmax; 919 target->caps = source->caps; 920 target->options = source->options; 921 target->auth_info = source->auth_info; 922 target->port = source->port; 923 } 924 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 925 926 void nfs_server_insert_lists(struct nfs_server *server) 927 { 928 struct nfs_client *clp = server->nfs_client; 929 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 930 931 spin_lock(&nn->nfs_client_lock); 932 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 933 list_add_tail(&server->master_link, &nn->nfs_volume_list); 934 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 935 spin_unlock(&nn->nfs_client_lock); 936 937 } 938 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 939 940 void nfs_server_remove_lists(struct nfs_server *server) 941 { 942 struct nfs_client *clp = server->nfs_client; 943 struct nfs_net *nn; 944 945 if (clp == NULL) 946 return; 947 nn = net_generic(clp->cl_net, nfs_net_id); 948 spin_lock(&nn->nfs_client_lock); 949 list_del_rcu(&server->client_link); 950 if (list_empty(&clp->cl_superblocks)) 951 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 952 list_del(&server->master_link); 953 spin_unlock(&nn->nfs_client_lock); 954 955 synchronize_rcu(); 956 } 957 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 958 959 static DEFINE_IDA(s_sysfs_ids); 960 961 /* 962 * Allocate and initialise a server record 963 */ 964 struct nfs_server *nfs_alloc_server(void) 965 { 966 struct nfs_server *server; 967 968 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 969 if (!server) 970 return NULL; 971 972 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 973 if (server->s_sysfs_id < 0) { 974 kfree(server); 975 return NULL; 976 } 977 978 server->client = server->client_acl = ERR_PTR(-EINVAL); 979 980 /* Zero out the NFS state stuff */ 981 INIT_LIST_HEAD(&server->client_link); 982 INIT_LIST_HEAD(&server->master_link); 983 INIT_LIST_HEAD(&server->delegations); 984 INIT_LIST_HEAD(&server->layouts); 985 INIT_LIST_HEAD(&server->state_owners_lru); 986 INIT_LIST_HEAD(&server->ss_copies); 987 988 atomic_set(&server->active, 0); 989 990 server->io_stats = nfs_alloc_iostats(); 991 if (!server->io_stats) { 992 kfree(server); 993 return NULL; 994 } 995 996 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 997 998 ida_init(&server->openowner_id); 999 ida_init(&server->lockowner_id); 1000 pnfs_init_server(server); 1001 rpc_init_wait_queue(&server->uoc_rpcwaitq, "NFS UOC"); 1002 1003 return server; 1004 } 1005 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1006 1007 /* 1008 * Free up a server record 1009 */ 1010 void nfs_free_server(struct nfs_server *server) 1011 { 1012 nfs_server_remove_lists(server); 1013 1014 if (server->destroy != NULL) 1015 server->destroy(server); 1016 1017 if (!IS_ERR(server->client_acl)) 1018 rpc_shutdown_client(server->client_acl); 1019 if (!IS_ERR(server->client)) 1020 rpc_shutdown_client(server->client); 1021 1022 nfs_put_client(server->nfs_client); 1023 1024 if (server->kobj.state_initialized) { 1025 nfs_sysfs_remove_server(server); 1026 kobject_put(&server->kobj); 1027 } 1028 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1029 1030 ida_destroy(&server->lockowner_id); 1031 ida_destroy(&server->openowner_id); 1032 nfs_free_iostats(server->io_stats); 1033 put_cred(server->cred); 1034 kfree(server); 1035 nfs_release_automount_timer(); 1036 } 1037 EXPORT_SYMBOL_GPL(nfs_free_server); 1038 1039 /* 1040 * Create a version 2 or 3 volume record 1041 * - keyed on server and FSID 1042 */ 1043 struct nfs_server *nfs_create_server(struct fs_context *fc) 1044 { 1045 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1046 struct nfs_server *server; 1047 struct nfs_fattr *fattr; 1048 int error; 1049 1050 server = nfs_alloc_server(); 1051 if (!server) 1052 return ERR_PTR(-ENOMEM); 1053 1054 server->cred = get_cred(fc->cred); 1055 1056 error = -ENOMEM; 1057 fattr = nfs_alloc_fattr(); 1058 if (fattr == NULL) 1059 goto error; 1060 1061 /* Get a client representation */ 1062 error = nfs_init_server(server, fc); 1063 if (error < 0) 1064 goto error; 1065 1066 /* Probe the root fh to retrieve its FSID */ 1067 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1068 if (error < 0) 1069 goto error; 1070 if (server->nfs_client->rpc_ops->version == 3) { 1071 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1072 server->namelen = NFS3_MAXNAMLEN; 1073 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1074 server->caps |= NFS_CAP_READDIRPLUS; 1075 } else { 1076 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1077 server->namelen = NFS2_MAXNAMLEN; 1078 } 1079 1080 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1081 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1082 fattr, NULL); 1083 if (error < 0) { 1084 dprintk("nfs_create_server: getattr error = %d\n", -error); 1085 goto error; 1086 } 1087 } 1088 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1089 1090 dprintk("Server FSID: %llx:%llx\n", 1091 (unsigned long long) server->fsid.major, 1092 (unsigned long long) server->fsid.minor); 1093 1094 nfs_server_insert_lists(server); 1095 server->mount_time = jiffies; 1096 nfs_free_fattr(fattr); 1097 return server; 1098 1099 error: 1100 nfs_free_fattr(fattr); 1101 nfs_free_server(server); 1102 return ERR_PTR(error); 1103 } 1104 EXPORT_SYMBOL_GPL(nfs_create_server); 1105 1106 /* 1107 * Clone an NFS2, NFS3 or NFS4 server record 1108 */ 1109 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1110 struct nfs_fh *fh, 1111 struct nfs_fattr *fattr, 1112 rpc_authflavor_t flavor) 1113 { 1114 struct nfs_server *server; 1115 int error; 1116 1117 server = nfs_alloc_server(); 1118 if (!server) 1119 return ERR_PTR(-ENOMEM); 1120 1121 server->cred = get_cred(source->cred); 1122 1123 /* Copy data from the source */ 1124 server->nfs_client = source->nfs_client; 1125 server->destroy = source->destroy; 1126 refcount_inc(&server->nfs_client->cl_count); 1127 nfs_server_copy_userdata(server, source); 1128 1129 server->fsid = fattr->fsid; 1130 1131 nfs_sysfs_add_server(server); 1132 1133 nfs_sysfs_link_rpc_client(server, 1134 server->nfs_client->cl_rpcclient, "_state"); 1135 1136 error = nfs_init_server_rpcclient(server, 1137 source->client->cl_timeout, 1138 flavor); 1139 if (error < 0) 1140 goto out_free_server; 1141 1142 /* probe the filesystem info for this server filesystem */ 1143 error = nfs_probe_server(server, fh); 1144 if (error < 0) 1145 goto out_free_server; 1146 1147 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1148 server->namelen = NFS4_MAXNAMLEN; 1149 1150 error = nfs_start_lockd(server); 1151 if (error < 0) 1152 goto out_free_server; 1153 1154 nfs_server_insert_lists(server); 1155 server->mount_time = jiffies; 1156 1157 return server; 1158 1159 out_free_server: 1160 nfs_free_server(server); 1161 return ERR_PTR(error); 1162 } 1163 EXPORT_SYMBOL_GPL(nfs_clone_server); 1164 1165 void nfs_clients_init(struct net *net) 1166 { 1167 struct nfs_net *nn = net_generic(net, nfs_net_id); 1168 1169 INIT_LIST_HEAD(&nn->nfs_client_list); 1170 INIT_LIST_HEAD(&nn->nfs_volume_list); 1171 #if IS_ENABLED(CONFIG_NFS_V4) 1172 idr_init(&nn->cb_ident_idr); 1173 #endif 1174 spin_lock_init(&nn->nfs_client_lock); 1175 nn->boot_time = ktime_get_real(); 1176 1177 nfs_netns_sysfs_setup(nn, net); 1178 } 1179 1180 void nfs_clients_exit(struct net *net) 1181 { 1182 struct nfs_net *nn = net_generic(net, nfs_net_id); 1183 1184 nfs_netns_sysfs_destroy(nn); 1185 nfs_cleanup_cb_ident_idr(net); 1186 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1187 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1188 } 1189 1190 #ifdef CONFIG_PROC_FS 1191 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1192 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1193 static void nfs_server_list_stop(struct seq_file *p, void *v); 1194 static int nfs_server_list_show(struct seq_file *m, void *v); 1195 1196 static const struct seq_operations nfs_server_list_ops = { 1197 .start = nfs_server_list_start, 1198 .next = nfs_server_list_next, 1199 .stop = nfs_server_list_stop, 1200 .show = nfs_server_list_show, 1201 }; 1202 1203 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1204 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1205 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1206 static int nfs_volume_list_show(struct seq_file *m, void *v); 1207 1208 static const struct seq_operations nfs_volume_list_ops = { 1209 .start = nfs_volume_list_start, 1210 .next = nfs_volume_list_next, 1211 .stop = nfs_volume_list_stop, 1212 .show = nfs_volume_list_show, 1213 }; 1214 1215 /* 1216 * set up the iterator to start reading from the server list and return the first item 1217 */ 1218 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1219 __acquires(&nn->nfs_client_lock) 1220 { 1221 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1222 1223 /* lock the list against modification */ 1224 spin_lock(&nn->nfs_client_lock); 1225 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1226 } 1227 1228 /* 1229 * move to next server 1230 */ 1231 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1232 { 1233 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1234 1235 return seq_list_next(v, &nn->nfs_client_list, pos); 1236 } 1237 1238 /* 1239 * clean up after reading from the transports list 1240 */ 1241 static void nfs_server_list_stop(struct seq_file *p, void *v) 1242 __releases(&nn->nfs_client_lock) 1243 { 1244 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1245 1246 spin_unlock(&nn->nfs_client_lock); 1247 } 1248 1249 /* 1250 * display a header line followed by a load of call lines 1251 */ 1252 static int nfs_server_list_show(struct seq_file *m, void *v) 1253 { 1254 struct nfs_client *clp; 1255 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1256 1257 /* display header on line 1 */ 1258 if (v == &nn->nfs_client_list) { 1259 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1260 return 0; 1261 } 1262 1263 /* display one transport per line on subsequent lines */ 1264 clp = list_entry(v, struct nfs_client, cl_share_link); 1265 1266 /* Check if the client is initialized */ 1267 if (clp->cl_cons_state != NFS_CS_READY) 1268 return 0; 1269 1270 rcu_read_lock(); 1271 seq_printf(m, "v%u %s %s %3d %s\n", 1272 clp->rpc_ops->version, 1273 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1274 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1275 refcount_read(&clp->cl_count), 1276 clp->cl_hostname); 1277 rcu_read_unlock(); 1278 1279 return 0; 1280 } 1281 1282 /* 1283 * set up the iterator to start reading from the volume list and return the first item 1284 */ 1285 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1286 __acquires(&nn->nfs_client_lock) 1287 { 1288 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1289 1290 /* lock the list against modification */ 1291 spin_lock(&nn->nfs_client_lock); 1292 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1293 } 1294 1295 /* 1296 * move to next volume 1297 */ 1298 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1299 { 1300 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1301 1302 return seq_list_next(v, &nn->nfs_volume_list, pos); 1303 } 1304 1305 /* 1306 * clean up after reading from the transports list 1307 */ 1308 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1309 __releases(&nn->nfs_client_lock) 1310 { 1311 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1312 1313 spin_unlock(&nn->nfs_client_lock); 1314 } 1315 1316 /* 1317 * display a header line followed by a load of call lines 1318 */ 1319 static int nfs_volume_list_show(struct seq_file *m, void *v) 1320 { 1321 struct nfs_server *server; 1322 struct nfs_client *clp; 1323 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1324 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1325 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1326 1327 /* display header on line 1 */ 1328 if (v == &nn->nfs_volume_list) { 1329 seq_puts(m, "NV SERVER PORT DEV FSID" 1330 " FSC\n"); 1331 return 0; 1332 } 1333 /* display one transport per line on subsequent lines */ 1334 server = list_entry(v, struct nfs_server, master_link); 1335 clp = server->nfs_client; 1336 1337 snprintf(dev, sizeof(dev), "%u:%u", 1338 MAJOR(server->s_dev), MINOR(server->s_dev)); 1339 1340 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1341 (unsigned long long) server->fsid.major, 1342 (unsigned long long) server->fsid.minor); 1343 1344 rcu_read_lock(); 1345 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1346 clp->rpc_ops->version, 1347 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1348 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1349 dev, 1350 fsid, 1351 nfs_server_fscache_state(server)); 1352 rcu_read_unlock(); 1353 1354 return 0; 1355 } 1356 1357 int nfs_fs_proc_net_init(struct net *net) 1358 { 1359 struct nfs_net *nn = net_generic(net, nfs_net_id); 1360 struct proc_dir_entry *p; 1361 1362 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1363 if (!nn->proc_nfsfs) 1364 goto error_0; 1365 1366 /* a file of servers with which we're dealing */ 1367 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1368 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1369 if (!p) 1370 goto error_1; 1371 1372 /* a file of volumes that we have mounted */ 1373 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1374 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1375 if (!p) 1376 goto error_1; 1377 return 0; 1378 1379 error_1: 1380 remove_proc_subtree("nfsfs", net->proc_net); 1381 error_0: 1382 return -ENOMEM; 1383 } 1384 1385 void nfs_fs_proc_net_exit(struct net *net) 1386 { 1387 remove_proc_subtree("nfsfs", net->proc_net); 1388 } 1389 1390 /* 1391 * initialise the /proc/fs/nfsfs/ directory 1392 */ 1393 int __init nfs_fs_proc_init(void) 1394 { 1395 if (!proc_mkdir("fs/nfsfs", NULL)) 1396 goto error_0; 1397 1398 /* a file of servers with which we're dealing */ 1399 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1400 goto error_1; 1401 1402 /* a file of volumes that we have mounted */ 1403 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1404 goto error_1; 1405 1406 return 0; 1407 error_1: 1408 remove_proc_subtree("fs/nfsfs", NULL); 1409 error_0: 1410 return -ENOMEM; 1411 } 1412 1413 /* 1414 * clean up the /proc/fs/nfsfs/ directory 1415 */ 1416 void nfs_fs_proc_exit(void) 1417 { 1418 remove_proc_subtree("fs/nfsfs", NULL); 1419 ida_destroy(&s_sysfs_ids); 1420 } 1421 1422 #endif /* CONFIG_PROC_FS */ 1423