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 57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58static DEFINE_SPINLOCK(nfs_version_lock); 59static DEFINE_MUTEX(nfs_version_mutex); 60static LIST_HEAD(nfs_versions); 61 62/* 63 * RPC cruft for NFS 64 */ 65static const struct rpc_version *nfs_version[5] = { 66 [2] = NULL, 67 [3] = NULL, 68 [4] = NULL, 69}; 70 71const 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 80struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82}; 83 84static 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 100struct 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 116void put_nfs_version(struct nfs_subversion *nfs) 117{ 118 module_put(nfs->owner); 119} 120 121void 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} 130EXPORT_SYMBOL_GPL(register_nfs_version); 131 132void 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} 141EXPORT_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 */ 149struct 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 190error_cleanup: 191 put_nfs_version(clp->cl_nfs_mod); 192error_dealloc: 193 kfree(clp); 194error_0: 195 return ERR_PTR(err); 196} 197EXPORT_SYMBOL_GPL(nfs_alloc_client); 198 199#if IS_ENABLED(CONFIG_NFS_V4) 200static 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 */ 208static 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 216static void pnfs_init_server(struct nfs_server *server) 217{ 218 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 219} 220 221#else 222static void nfs_cleanup_cb_ident_idr(struct net *net) 223{ 224} 225 226static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 227{ 228} 229 230static 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 */ 239void 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} 251EXPORT_SYMBOL_GPL(nfs_free_client); 252 253/* 254 * Release a reference to a shared client record 255 */ 256void 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} 275EXPORT_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 */ 281static 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 288again: 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 */ 345bool nfs_client_init_is_complete(const struct nfs_client *clp) 346{ 347 return clp->cl_cons_state <= NFS_CS_READY; 348} 349EXPORT_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 */ 357int 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} 366EXPORT_SYMBOL_GPL(nfs_client_init_status); 367 368int 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} 373EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 374 375/* 376 * Found an existing client. Make sure it's ready before returning. 377 */ 378static struct nfs_client * 379nfs_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 */ 404struct 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} 442EXPORT_SYMBOL_GPL(nfs_get_client); 443 444/* 445 * Mark a server as ready or failed 446 */ 447void 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} 453EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 454 455/* 456 * Initialise the timeout values for a connection 457 */ 458void 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} 496EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 497 498/* 499 * Create an RPC client handle 500 */ 501int 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 .connect_timeout = cl_init->connect_timeout, 521 .reconnect_timeout = cl_init->reconnect_timeout, 522 }; 523 524 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 525 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 526 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 527 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 528 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 529 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 530 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 531 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 532 if (test_bit(NFS_CS_NOPING, &clp->cl_flags)) 533 args.flags |= RPC_CLNT_CREATE_NOPING; 534 if (test_bit(NFS_CS_REUSEPORT, &clp->cl_flags)) 535 args.flags |= RPC_CLNT_CREATE_REUSEPORT; 536 537 if (!IS_ERR(clp->cl_rpcclient)) 538 return 0; 539 540 clnt = rpc_create(&args); 541 if (IS_ERR(clnt)) { 542 dprintk("%s: cannot create RPC client. Error = %ld\n", 543 __func__, PTR_ERR(clnt)); 544 return PTR_ERR(clnt); 545 } 546 547 clnt->cl_principal = clp->cl_principal; 548 clp->cl_rpcclient = clnt; 549 clnt->cl_max_connect = clp->cl_max_connect; 550 return 0; 551} 552EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 553 554/* 555 * Version 2 or 3 client destruction 556 */ 557static void nfs_destroy_server(struct nfs_server *server) 558{ 559 if (server->nlm_host) 560 nlmclnt_done(server->nlm_host); 561} 562 563/* 564 * Version 2 or 3 lockd setup 565 */ 566static int nfs_start_lockd(struct nfs_server *server) 567{ 568 struct nlm_host *host; 569 struct nfs_client *clp = server->nfs_client; 570 struct nlmclnt_initdata nlm_init = { 571 .hostname = clp->cl_hostname, 572 .address = (struct sockaddr *)&clp->cl_addr, 573 .addrlen = clp->cl_addrlen, 574 .nfs_version = clp->rpc_ops->version, 575 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 576 1 : 0, 577 .net = clp->cl_net, 578 .nlmclnt_ops = clp->cl_nfs_mod->rpc_ops->nlmclnt_ops, 579 .cred = server->cred, 580 }; 581 582 if (nlm_init.nfs_version > 3) 583 return 0; 584 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 585 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 586 return 0; 587 588 switch (clp->cl_proto) { 589 default: 590 nlm_init.protocol = IPPROTO_TCP; 591 break; 592#ifndef CONFIG_NFS_DISABLE_UDP_SUPPORT 593 case XPRT_TRANSPORT_UDP: 594 nlm_init.protocol = IPPROTO_UDP; 595#endif 596 } 597 598 host = nlmclnt_init(&nlm_init); 599 if (IS_ERR(host)) 600 return PTR_ERR(host); 601 602 server->nlm_host = host; 603 server->destroy = nfs_destroy_server; 604 nfs_sysfs_link_rpc_client(server, nlmclnt_rpc_clnt(host), NULL); 605 return 0; 606} 607 608/* 609 * Create a general RPC client 610 */ 611int nfs_init_server_rpcclient(struct nfs_server *server, 612 const struct rpc_timeout *timeo, 613 rpc_authflavor_t pseudoflavour) 614{ 615 struct nfs_client *clp = server->nfs_client; 616 617 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 618 pseudoflavour); 619 if (IS_ERR(server->client)) { 620 dprintk("%s: couldn't create rpc_client!\n", __func__); 621 return PTR_ERR(server->client); 622 } 623 624 memcpy(&server->client->cl_timeout_default, 625 timeo, 626 sizeof(server->client->cl_timeout_default)); 627 server->client->cl_timeout = &server->client->cl_timeout_default; 628 server->client->cl_softrtry = 0; 629 if (server->flags & NFS_MOUNT_SOFTERR) 630 server->client->cl_softerr = 1; 631 if (server->flags & NFS_MOUNT_SOFT) 632 server->client->cl_softrtry = 1; 633 634 nfs_sysfs_link_rpc_client(server, server->client, NULL); 635 return 0; 636} 637EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 638 639/** 640 * nfs_init_client - Initialise an NFS2 or NFS3 client 641 * 642 * @clp: nfs_client to initialise 643 * @cl_init: Initialisation parameters 644 * 645 * Returns pointer to an NFS client, or an ERR_PTR value. 646 */ 647struct nfs_client *nfs_init_client(struct nfs_client *clp, 648 const struct nfs_client_initdata *cl_init) 649{ 650 int error; 651 652 /* the client is already initialised */ 653 if (clp->cl_cons_state == NFS_CS_READY) 654 return clp; 655 656 /* 657 * Create a client RPC handle for doing FSSTAT with UNIX auth only 658 * - RFC 2623, sec 2.3.2 659 */ 660 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 661 nfs_mark_client_ready(clp, error == 0 ? NFS_CS_READY : error); 662 if (error < 0) { 663 nfs_put_client(clp); 664 clp = ERR_PTR(error); 665 } 666 return clp; 667} 668EXPORT_SYMBOL_GPL(nfs_init_client); 669 670/* 671 * Create a version 2 or 3 client 672 */ 673static int nfs_init_server(struct nfs_server *server, 674 const struct fs_context *fc) 675{ 676 const struct nfs_fs_context *ctx = nfs_fc2context(fc); 677 struct rpc_timeout timeparms; 678 struct nfs_client_initdata cl_init = { 679 .hostname = ctx->nfs_server.hostname, 680 .addr = &ctx->nfs_server._address, 681 .addrlen = ctx->nfs_server.addrlen, 682 .nfs_mod = ctx->nfs_mod, 683 .proto = ctx->nfs_server.protocol, 684 .net = fc->net_ns, 685 .timeparms = &timeparms, 686 .cred = server->cred, 687 .nconnect = ctx->nfs_server.nconnect, 688 .init_flags = (1UL << NFS_CS_REUSEPORT), 689 .xprtsec = ctx->xprtsec, 690 }; 691 struct nfs_client *clp; 692 int error; 693 694 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 695 ctx->timeo, ctx->retrans); 696 if (ctx->flags & NFS_MOUNT_NORESVPORT) 697 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 698 699 /* Allocate or find a client reference we can use */ 700 clp = nfs_get_client(&cl_init); 701 if (IS_ERR(clp)) 702 return PTR_ERR(clp); 703 704 server->nfs_client = clp; 705 nfs_sysfs_add_server(server); 706 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 707 708 /* Initialise the client representation from the mount data */ 709 server->flags = ctx->flags; 710 server->options = ctx->options; 711 server->caps |= NFS_CAP_HARDLINKS | NFS_CAP_SYMLINKS; 712 713 switch (clp->rpc_ops->version) { 714 case 2: 715 server->fattr_valid = NFS_ATTR_FATTR_V2; 716 break; 717 case 3: 718 server->fattr_valid = NFS_ATTR_FATTR_V3; 719 break; 720 default: 721 server->fattr_valid = NFS_ATTR_FATTR_V4; 722 } 723 724 if (ctx->rsize) 725 server->rsize = nfs_io_size(ctx->rsize, clp->cl_proto); 726 if (ctx->wsize) 727 server->wsize = nfs_io_size(ctx->wsize, clp->cl_proto); 728 729 server->acregmin = ctx->acregmin * HZ; 730 server->acregmax = ctx->acregmax * HZ; 731 server->acdirmin = ctx->acdirmin * HZ; 732 server->acdirmax = ctx->acdirmax * HZ; 733 734 /* Start lockd here, before we might error out */ 735 error = nfs_start_lockd(server); 736 if (error < 0) 737 goto error; 738 739 server->port = ctx->nfs_server.port; 740 server->auth_info = ctx->auth_info; 741 742 error = nfs_init_server_rpcclient(server, &timeparms, 743 ctx->selected_flavor); 744 if (error < 0) 745 goto error; 746 747 /* Preserve the values of mount_server-related mount options */ 748 if (ctx->mount_server.addrlen) { 749 memcpy(&server->mountd_address, &ctx->mount_server.address, 750 ctx->mount_server.addrlen); 751 server->mountd_addrlen = ctx->mount_server.addrlen; 752 } 753 server->mountd_version = ctx->mount_server.version; 754 server->mountd_port = ctx->mount_server.port; 755 server->mountd_protocol = ctx->mount_server.protocol; 756 757 server->namelen = ctx->namlen; 758 return 0; 759 760error: 761 server->nfs_client = NULL; 762 nfs_put_client(clp); 763 return error; 764} 765 766/* 767 * Load up the server record from information gained in an fsinfo record 768 */ 769static void nfs_server_set_fsinfo(struct nfs_server *server, 770 struct nfs_fsinfo *fsinfo) 771{ 772 struct nfs_client *clp = server->nfs_client; 773 unsigned long max_rpc_payload, raw_max_rpc_payload; 774 775 /* Work out a lot of parameters */ 776 if (server->rsize == 0) 777 server->rsize = nfs_io_size(fsinfo->rtpref, clp->cl_proto); 778 if (server->wsize == 0) 779 server->wsize = nfs_io_size(fsinfo->wtpref, clp->cl_proto); 780 781 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 782 server->rsize = nfs_io_size(fsinfo->rtmax, clp->cl_proto); 783 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 784 server->wsize = nfs_io_size(fsinfo->wtmax, clp->cl_proto); 785 786 raw_max_rpc_payload = rpc_max_payload(server->client); 787 max_rpc_payload = nfs_block_size(raw_max_rpc_payload, NULL); 788 789 if (server->rsize > max_rpc_payload) 790 server->rsize = max_rpc_payload; 791 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 792 server->rsize = NFS_MAX_FILE_IO_SIZE; 793 server->rpages = (server->rsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 794 795 if (server->wsize > max_rpc_payload) 796 server->wsize = max_rpc_payload; 797 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 798 server->wsize = NFS_MAX_FILE_IO_SIZE; 799 server->wpages = (server->wsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 800 801 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 802 803 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 804 if (server->dtsize > NFS_MAX_FILE_IO_SIZE) 805 server->dtsize = NFS_MAX_FILE_IO_SIZE; 806 if (server->dtsize > server->rsize) 807 server->dtsize = server->rsize; 808 809 if (server->flags & NFS_MOUNT_NOAC) { 810 server->acregmin = server->acregmax = 0; 811 server->acdirmin = server->acdirmax = 0; 812 } 813 814 server->maxfilesize = fsinfo->maxfilesize; 815 816 server->time_delta = fsinfo->time_delta; 817 server->change_attr_type = fsinfo->change_attr_type; 818 819 server->clone_blksize = fsinfo->clone_blksize; 820 /* We're airborne Set socket buffersize */ 821 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 822 823#ifdef CONFIG_NFS_V4_2 824 /* 825 * Defaults until limited by the session parameters. 826 */ 827 server->gxasize = min_t(unsigned int, raw_max_rpc_payload, 828 XATTR_SIZE_MAX); 829 server->sxasize = min_t(unsigned int, raw_max_rpc_payload, 830 XATTR_SIZE_MAX); 831 server->lxasize = min_t(unsigned int, raw_max_rpc_payload, 832 nfs42_listxattr_xdrsize(XATTR_LIST_MAX)); 833 834 if (fsinfo->xattr_support) 835 server->caps |= NFS_CAP_XATTR; 836#endif 837} 838 839/* 840 * Probe filesystem information, including the FSID on v2/v3 841 */ 842static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 843{ 844 struct nfs_fsinfo fsinfo; 845 struct nfs_client *clp = server->nfs_client; 846 int error; 847 848 if (clp->rpc_ops->set_capabilities != NULL) { 849 error = clp->rpc_ops->set_capabilities(server, mntfh); 850 if (error < 0) 851 return error; 852 } 853 854 fsinfo.fattr = fattr; 855 fsinfo.nlayouttypes = 0; 856 memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); 857 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 858 if (error < 0) 859 return error; 860 861 nfs_server_set_fsinfo(server, &fsinfo); 862 863 /* Get some general file system info */ 864 if (server->namelen == 0) { 865 struct nfs_pathconf pathinfo; 866 867 pathinfo.fattr = fattr; 868 nfs_fattr_init(fattr); 869 870 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 871 server->namelen = pathinfo.max_namelen; 872 } 873 874 if (clp->rpc_ops->discover_trunking != NULL && 875 (server->caps & NFS_CAP_FS_LOCATIONS && 876 (server->flags & NFS_MOUNT_TRUNK_DISCOVERY))) { 877 error = clp->rpc_ops->discover_trunking(server, mntfh); 878 if (error < 0) 879 return error; 880 } 881 882 return 0; 883} 884 885/* 886 * Grab the destination's particulars, including lease expiry time. 887 * 888 * Returns zero if probe succeeded and retrieved FSID matches the FSID 889 * we have cached. 890 */ 891int nfs_probe_server(struct nfs_server *server, struct nfs_fh *mntfh) 892{ 893 struct nfs_fattr *fattr; 894 int error; 895 896 fattr = nfs_alloc_fattr(); 897 if (fattr == NULL) 898 return -ENOMEM; 899 900 /* Sanity: the probe won't work if the destination server 901 * does not recognize the migrated FH. */ 902 error = nfs_probe_fsinfo(server, mntfh, fattr); 903 904 nfs_free_fattr(fattr); 905 return error; 906} 907EXPORT_SYMBOL_GPL(nfs_probe_server); 908 909/* 910 * Copy useful information when duplicating a server record 911 */ 912void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 913{ 914 target->flags = source->flags; 915 target->rsize = source->rsize; 916 target->wsize = source->wsize; 917 target->acregmin = source->acregmin; 918 target->acregmax = source->acregmax; 919 target->acdirmin = source->acdirmin; 920 target->acdirmax = source->acdirmax; 921 target->caps = source->caps; 922 target->options = source->options; 923 target->auth_info = source->auth_info; 924 target->port = source->port; 925} 926EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 927 928void nfs_server_insert_lists(struct nfs_server *server) 929{ 930 struct nfs_client *clp = server->nfs_client; 931 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 932 933 spin_lock(&nn->nfs_client_lock); 934 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 935 list_add_tail(&server->master_link, &nn->nfs_volume_list); 936 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 937 spin_unlock(&nn->nfs_client_lock); 938 939} 940EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 941 942void nfs_server_remove_lists(struct nfs_server *server) 943{ 944 struct nfs_client *clp = server->nfs_client; 945 struct nfs_net *nn; 946 947 if (clp == NULL) 948 return; 949 nn = net_generic(clp->cl_net, nfs_net_id); 950 spin_lock(&nn->nfs_client_lock); 951 list_del_rcu(&server->client_link); 952 if (list_empty(&clp->cl_superblocks)) 953 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 954 list_del(&server->master_link); 955 spin_unlock(&nn->nfs_client_lock); 956 957 synchronize_rcu(); 958} 959EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 960 961static DEFINE_IDA(s_sysfs_ids); 962 963/* 964 * Allocate and initialise a server record 965 */ 966struct nfs_server *nfs_alloc_server(void) 967{ 968 struct nfs_server *server; 969 970 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 971 if (!server) 972 return NULL; 973 974 server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL); 975 if (server->s_sysfs_id < 0) { 976 kfree(server); 977 return NULL; 978 } 979 980 server->client = server->client_acl = ERR_PTR(-EINVAL); 981 982 /* Zero out the NFS state stuff */ 983 INIT_LIST_HEAD(&server->client_link); 984 INIT_LIST_HEAD(&server->master_link); 985 INIT_LIST_HEAD(&server->delegations); 986 INIT_LIST_HEAD(&server->layouts); 987 INIT_LIST_HEAD(&server->state_owners_lru); 988 INIT_LIST_HEAD(&server->ss_copies); 989 990 atomic_set(&server->active, 0); 991 992 server->io_stats = nfs_alloc_iostats(); 993 if (!server->io_stats) { 994 kfree(server); 995 return NULL; 996 } 997 998 server->change_attr_type = NFS4_CHANGE_TYPE_IS_UNDEFINED; 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} 1007EXPORT_SYMBOL_GPL(nfs_alloc_server); 1008 1009/* 1010 * Free up a server record 1011 */ 1012void nfs_free_server(struct nfs_server *server) 1013{ 1014 nfs_server_remove_lists(server); 1015 1016 if (server->destroy != NULL) 1017 server->destroy(server); 1018 1019 if (!IS_ERR(server->client_acl)) 1020 rpc_shutdown_client(server->client_acl); 1021 if (!IS_ERR(server->client)) 1022 rpc_shutdown_client(server->client); 1023 1024 nfs_put_client(server->nfs_client); 1025 1026 if (server->kobj.state_initialized) { 1027 nfs_sysfs_remove_server(server); 1028 kobject_put(&server->kobj); 1029 } 1030 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1031 1032 ida_destroy(&server->lockowner_id); 1033 ida_destroy(&server->openowner_id); 1034 nfs_free_iostats(server->io_stats); 1035 put_cred(server->cred); 1036 kfree(server); 1037 nfs_release_automount_timer(); 1038} 1039EXPORT_SYMBOL_GPL(nfs_free_server); 1040 1041/* 1042 * Create a version 2 or 3 volume record 1043 * - keyed on server and FSID 1044 */ 1045struct nfs_server *nfs_create_server(struct fs_context *fc) 1046{ 1047 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1048 struct nfs_server *server; 1049 struct nfs_fattr *fattr; 1050 int error; 1051 1052 server = nfs_alloc_server(); 1053 if (!server) 1054 return ERR_PTR(-ENOMEM); 1055 1056 server->cred = get_cred(fc->cred); 1057 1058 error = -ENOMEM; 1059 fattr = nfs_alloc_fattr(); 1060 if (fattr == NULL) 1061 goto error; 1062 1063 /* Get a client representation */ 1064 error = nfs_init_server(server, fc); 1065 if (error < 0) 1066 goto error; 1067 1068 /* Probe the root fh to retrieve its FSID */ 1069 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1070 if (error < 0) 1071 goto error; 1072 if (server->nfs_client->rpc_ops->version == 3) { 1073 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1074 server->namelen = NFS3_MAXNAMLEN; 1075 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1076 server->caps |= NFS_CAP_READDIRPLUS; 1077 } else { 1078 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1079 server->namelen = NFS2_MAXNAMLEN; 1080 } 1081 1082 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1083 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1084 fattr, NULL); 1085 if (error < 0) { 1086 dprintk("nfs_create_server: getattr error = %d\n", -error); 1087 goto error; 1088 } 1089 } 1090 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1091 1092 dprintk("Server FSID: %llx:%llx\n", 1093 (unsigned long long) server->fsid.major, 1094 (unsigned long long) server->fsid.minor); 1095 1096 nfs_server_insert_lists(server); 1097 server->mount_time = jiffies; 1098 nfs_free_fattr(fattr); 1099 return server; 1100 1101error: 1102 nfs_free_fattr(fattr); 1103 nfs_free_server(server); 1104 return ERR_PTR(error); 1105} 1106EXPORT_SYMBOL_GPL(nfs_create_server); 1107 1108/* 1109 * Clone an NFS2, NFS3 or NFS4 server record 1110 */ 1111struct nfs_server *nfs_clone_server(struct nfs_server *source, 1112 struct nfs_fh *fh, 1113 struct nfs_fattr *fattr, 1114 rpc_authflavor_t flavor) 1115{ 1116 struct nfs_server *server; 1117 int error; 1118 1119 server = nfs_alloc_server(); 1120 if (!server) 1121 return ERR_PTR(-ENOMEM); 1122 1123 server->cred = get_cred(source->cred); 1124 1125 /* Copy data from the source */ 1126 server->nfs_client = source->nfs_client; 1127 server->destroy = source->destroy; 1128 refcount_inc(&server->nfs_client->cl_count); 1129 nfs_server_copy_userdata(server, source); 1130 1131 server->fsid = fattr->fsid; 1132 1133 nfs_sysfs_add_server(server); 1134 1135 nfs_sysfs_link_rpc_client(server, 1136 server->nfs_client->cl_rpcclient, "_state"); 1137 1138 error = nfs_init_server_rpcclient(server, 1139 source->client->cl_timeout, 1140 flavor); 1141 if (error < 0) 1142 goto out_free_server; 1143 1144 /* probe the filesystem info for this server filesystem */ 1145 error = nfs_probe_server(server, fh); 1146 if (error < 0) 1147 goto out_free_server; 1148 1149 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1150 server->namelen = NFS4_MAXNAMLEN; 1151 1152 error = nfs_start_lockd(server); 1153 if (error < 0) 1154 goto out_free_server; 1155 1156 nfs_server_insert_lists(server); 1157 server->mount_time = jiffies; 1158 1159 return server; 1160 1161out_free_server: 1162 nfs_free_server(server); 1163 return ERR_PTR(error); 1164} 1165EXPORT_SYMBOL_GPL(nfs_clone_server); 1166 1167void nfs_clients_init(struct net *net) 1168{ 1169 struct nfs_net *nn = net_generic(net, nfs_net_id); 1170 1171 INIT_LIST_HEAD(&nn->nfs_client_list); 1172 INIT_LIST_HEAD(&nn->nfs_volume_list); 1173#if IS_ENABLED(CONFIG_NFS_V4) 1174 idr_init(&nn->cb_ident_idr); 1175#endif 1176 spin_lock_init(&nn->nfs_client_lock); 1177 nn->boot_time = ktime_get_real(); 1178 1179 nfs_netns_sysfs_setup(nn, net); 1180} 1181 1182void nfs_clients_exit(struct net *net) 1183{ 1184 struct nfs_net *nn = net_generic(net, nfs_net_id); 1185 1186 nfs_netns_sysfs_destroy(nn); 1187 nfs_cleanup_cb_ident_idr(net); 1188 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1189 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1190} 1191 1192#ifdef CONFIG_PROC_FS 1193static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1194static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1195static void nfs_server_list_stop(struct seq_file *p, void *v); 1196static int nfs_server_list_show(struct seq_file *m, void *v); 1197 1198static const struct seq_operations nfs_server_list_ops = { 1199 .start = nfs_server_list_start, 1200 .next = nfs_server_list_next, 1201 .stop = nfs_server_list_stop, 1202 .show = nfs_server_list_show, 1203}; 1204 1205static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1206static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1207static void nfs_volume_list_stop(struct seq_file *p, void *v); 1208static int nfs_volume_list_show(struct seq_file *m, void *v); 1209 1210static const struct seq_operations nfs_volume_list_ops = { 1211 .start = nfs_volume_list_start, 1212 .next = nfs_volume_list_next, 1213 .stop = nfs_volume_list_stop, 1214 .show = nfs_volume_list_show, 1215}; 1216 1217/* 1218 * set up the iterator to start reading from the server list and return the first item 1219 */ 1220static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1221 __acquires(&nn->nfs_client_lock) 1222{ 1223 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1224 1225 /* lock the list against modification */ 1226 spin_lock(&nn->nfs_client_lock); 1227 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1228} 1229 1230/* 1231 * move to next server 1232 */ 1233static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1234{ 1235 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1236 1237 return seq_list_next(v, &nn->nfs_client_list, pos); 1238} 1239 1240/* 1241 * clean up after reading from the transports list 1242 */ 1243static void nfs_server_list_stop(struct seq_file *p, void *v) 1244 __releases(&nn->nfs_client_lock) 1245{ 1246 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1247 1248 spin_unlock(&nn->nfs_client_lock); 1249} 1250 1251/* 1252 * display a header line followed by a load of call lines 1253 */ 1254static int nfs_server_list_show(struct seq_file *m, void *v) 1255{ 1256 struct nfs_client *clp; 1257 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1258 1259 /* display header on line 1 */ 1260 if (v == &nn->nfs_client_list) { 1261 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1262 return 0; 1263 } 1264 1265 /* display one transport per line on subsequent lines */ 1266 clp = list_entry(v, struct nfs_client, cl_share_link); 1267 1268 /* Check if the client is initialized */ 1269 if (clp->cl_cons_state != NFS_CS_READY) 1270 return 0; 1271 1272 rcu_read_lock(); 1273 seq_printf(m, "v%u %s %s %3d %s\n", 1274 clp->rpc_ops->version, 1275 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1276 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1277 refcount_read(&clp->cl_count), 1278 clp->cl_hostname); 1279 rcu_read_unlock(); 1280 1281 return 0; 1282} 1283 1284/* 1285 * set up the iterator to start reading from the volume list and return the first item 1286 */ 1287static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1288 __acquires(&nn->nfs_client_lock) 1289{ 1290 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1291 1292 /* lock the list against modification */ 1293 spin_lock(&nn->nfs_client_lock); 1294 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1295} 1296 1297/* 1298 * move to next volume 1299 */ 1300static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1301{ 1302 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1303 1304 return seq_list_next(v, &nn->nfs_volume_list, pos); 1305} 1306 1307/* 1308 * clean up after reading from the transports list 1309 */ 1310static void nfs_volume_list_stop(struct seq_file *p, void *v) 1311 __releases(&nn->nfs_client_lock) 1312{ 1313 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1314 1315 spin_unlock(&nn->nfs_client_lock); 1316} 1317 1318/* 1319 * display a header line followed by a load of call lines 1320 */ 1321static int nfs_volume_list_show(struct seq_file *m, void *v) 1322{ 1323 struct nfs_server *server; 1324 struct nfs_client *clp; 1325 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1326 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1327 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1328 1329 /* display header on line 1 */ 1330 if (v == &nn->nfs_volume_list) { 1331 seq_puts(m, "NV SERVER PORT DEV FSID" 1332 " FSC\n"); 1333 return 0; 1334 } 1335 /* display one transport per line on subsequent lines */ 1336 server = list_entry(v, struct nfs_server, master_link); 1337 clp = server->nfs_client; 1338 1339 snprintf(dev, sizeof(dev), "%u:%u", 1340 MAJOR(server->s_dev), MINOR(server->s_dev)); 1341 1342 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1343 (unsigned long long) server->fsid.major, 1344 (unsigned long long) server->fsid.minor); 1345 1346 rcu_read_lock(); 1347 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1348 clp->rpc_ops->version, 1349 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1350 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1351 dev, 1352 fsid, 1353 nfs_server_fscache_state(server)); 1354 rcu_read_unlock(); 1355 1356 return 0; 1357} 1358 1359int nfs_fs_proc_net_init(struct net *net) 1360{ 1361 struct nfs_net *nn = net_generic(net, nfs_net_id); 1362 struct proc_dir_entry *p; 1363 1364 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1365 if (!nn->proc_nfsfs) 1366 goto error_0; 1367 1368 /* a file of servers with which we're dealing */ 1369 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1370 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1371 if (!p) 1372 goto error_1; 1373 1374 /* a file of volumes that we have mounted */ 1375 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1376 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1377 if (!p) 1378 goto error_1; 1379 return 0; 1380 1381error_1: 1382 remove_proc_subtree("nfsfs", net->proc_net); 1383error_0: 1384 return -ENOMEM; 1385} 1386 1387void nfs_fs_proc_net_exit(struct net *net) 1388{ 1389 remove_proc_subtree("nfsfs", net->proc_net); 1390} 1391 1392/* 1393 * initialise the /proc/fs/nfsfs/ directory 1394 */ 1395int __init nfs_fs_proc_init(void) 1396{ 1397 if (!proc_mkdir("fs/nfsfs", NULL)) 1398 goto error_0; 1399 1400 /* a file of servers with which we're dealing */ 1401 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1402 goto error_1; 1403 1404 /* a file of volumes that we have mounted */ 1405 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1406 goto error_1; 1407 1408 return 0; 1409error_1: 1410 remove_proc_subtree("fs/nfsfs", NULL); 1411error_0: 1412 return -ENOMEM; 1413} 1414 1415/* 1416 * clean up the /proc/fs/nfsfs/ directory 1417 */ 1418void nfs_fs_proc_exit(void) 1419{ 1420 remove_proc_subtree("fs/nfsfs", NULL); 1421 ida_destroy(&s_sysfs_ids); 1422} 1423 1424#endif /* CONFIG_PROC_FS */ 1425