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_rcu(clp, rcu); 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 .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 } 552 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 553 554 /* 555 * Version 2 or 3 client destruction 556 */ 557 static 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 */ 566 static 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 */ 611 int 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 } 637 EXPORT_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 */ 647 struct 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 } 668 EXPORT_SYMBOL_GPL(nfs_init_client); 669 670 /* 671 * Create a version 2 or 3 client 672 */ 673 static 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; 759 760 error: 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 */ 769 static 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 */ 842 static 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 */ 891 int 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 } 907 EXPORT_SYMBOL_GPL(nfs_probe_server); 908 909 /* 910 * Copy useful information when duplicating a server record 911 */ 912 void 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 } 926 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 927 928 void 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 } 940 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 941 942 void 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 } 959 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 960 961 static DEFINE_IDA(s_sysfs_ids); 962 963 /* 964 * Allocate and initialise a server record 965 */ 966 struct 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 } 1007 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1008 1009 static void delayed_free(struct rcu_head *p) 1010 { 1011 struct nfs_server *server = container_of(p, struct nfs_server, rcu); 1012 1013 nfs_free_iostats(server->io_stats); 1014 kfree(server); 1015 } 1016 1017 /* 1018 * Free up a server record 1019 */ 1020 void nfs_free_server(struct nfs_server *server) 1021 { 1022 nfs_server_remove_lists(server); 1023 1024 if (server->destroy != NULL) 1025 server->destroy(server); 1026 1027 if (!IS_ERR(server->client_acl)) 1028 rpc_shutdown_client(server->client_acl); 1029 if (!IS_ERR(server->client)) 1030 rpc_shutdown_client(server->client); 1031 1032 nfs_put_client(server->nfs_client); 1033 1034 if (server->kobj.state_initialized) { 1035 nfs_sysfs_remove_server(server); 1036 kobject_put(&server->kobj); 1037 } 1038 ida_free(&s_sysfs_ids, server->s_sysfs_id); 1039 1040 ida_destroy(&server->lockowner_id); 1041 ida_destroy(&server->openowner_id); 1042 put_cred(server->cred); 1043 nfs_release_automount_timer(); 1044 call_rcu(&server->rcu, delayed_free); 1045 } 1046 EXPORT_SYMBOL_GPL(nfs_free_server); 1047 1048 /* 1049 * Create a version 2 or 3 volume record 1050 * - keyed on server and FSID 1051 */ 1052 struct nfs_server *nfs_create_server(struct fs_context *fc) 1053 { 1054 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1055 struct nfs_server *server; 1056 struct nfs_fattr *fattr; 1057 int error; 1058 1059 server = nfs_alloc_server(); 1060 if (!server) 1061 return ERR_PTR(-ENOMEM); 1062 1063 server->cred = get_cred(fc->cred); 1064 1065 error = -ENOMEM; 1066 fattr = nfs_alloc_fattr(); 1067 if (fattr == NULL) 1068 goto error; 1069 1070 /* Get a client representation */ 1071 error = nfs_init_server(server, fc); 1072 if (error < 0) 1073 goto error; 1074 1075 /* Probe the root fh to retrieve its FSID */ 1076 error = nfs_probe_fsinfo(server, ctx->mntfh, fattr); 1077 if (error < 0) 1078 goto error; 1079 if (server->nfs_client->rpc_ops->version == 3) { 1080 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1081 server->namelen = NFS3_MAXNAMLEN; 1082 if (!(ctx->flags & NFS_MOUNT_NORDIRPLUS)) 1083 server->caps |= NFS_CAP_READDIRPLUS; 1084 } else { 1085 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1086 server->namelen = NFS2_MAXNAMLEN; 1087 } 1088 1089 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1090 error = ctx->nfs_mod->rpc_ops->getattr(server, ctx->mntfh, 1091 fattr, NULL); 1092 if (error < 0) { 1093 dprintk("nfs_create_server: getattr error = %d\n", -error); 1094 goto error; 1095 } 1096 } 1097 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1098 1099 dprintk("Server FSID: %llx:%llx\n", 1100 (unsigned long long) server->fsid.major, 1101 (unsigned long long) server->fsid.minor); 1102 1103 nfs_server_insert_lists(server); 1104 server->mount_time = jiffies; 1105 nfs_free_fattr(fattr); 1106 return server; 1107 1108 error: 1109 nfs_free_fattr(fattr); 1110 nfs_free_server(server); 1111 return ERR_PTR(error); 1112 } 1113 EXPORT_SYMBOL_GPL(nfs_create_server); 1114 1115 /* 1116 * Clone an NFS2, NFS3 or NFS4 server record 1117 */ 1118 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1119 struct nfs_fh *fh, 1120 struct nfs_fattr *fattr, 1121 rpc_authflavor_t flavor) 1122 { 1123 struct nfs_server *server; 1124 int error; 1125 1126 server = nfs_alloc_server(); 1127 if (!server) 1128 return ERR_PTR(-ENOMEM); 1129 1130 server->cred = get_cred(source->cred); 1131 1132 /* Copy data from the source */ 1133 server->nfs_client = source->nfs_client; 1134 server->destroy = source->destroy; 1135 refcount_inc(&server->nfs_client->cl_count); 1136 nfs_server_copy_userdata(server, source); 1137 1138 server->fsid = fattr->fsid; 1139 1140 nfs_sysfs_add_server(server); 1141 1142 nfs_sysfs_link_rpc_client(server, 1143 server->nfs_client->cl_rpcclient, "_state"); 1144 1145 error = nfs_init_server_rpcclient(server, 1146 source->client->cl_timeout, 1147 flavor); 1148 if (error < 0) 1149 goto out_free_server; 1150 1151 /* probe the filesystem info for this server filesystem */ 1152 error = nfs_probe_server(server, fh); 1153 if (error < 0) 1154 goto out_free_server; 1155 1156 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1157 server->namelen = NFS4_MAXNAMLEN; 1158 1159 error = nfs_start_lockd(server); 1160 if (error < 0) 1161 goto out_free_server; 1162 1163 nfs_server_insert_lists(server); 1164 server->mount_time = jiffies; 1165 1166 return server; 1167 1168 out_free_server: 1169 nfs_free_server(server); 1170 return ERR_PTR(error); 1171 } 1172 EXPORT_SYMBOL_GPL(nfs_clone_server); 1173 1174 void nfs_clients_init(struct net *net) 1175 { 1176 struct nfs_net *nn = net_generic(net, nfs_net_id); 1177 1178 INIT_LIST_HEAD(&nn->nfs_client_list); 1179 INIT_LIST_HEAD(&nn->nfs_volume_list); 1180 #if IS_ENABLED(CONFIG_NFS_V4) 1181 idr_init(&nn->cb_ident_idr); 1182 #endif 1183 spin_lock_init(&nn->nfs_client_lock); 1184 nn->boot_time = ktime_get_real(); 1185 1186 nfs_netns_sysfs_setup(nn, net); 1187 } 1188 1189 void nfs_clients_exit(struct net *net) 1190 { 1191 struct nfs_net *nn = net_generic(net, nfs_net_id); 1192 1193 nfs_netns_sysfs_destroy(nn); 1194 nfs_cleanup_cb_ident_idr(net); 1195 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list)); 1196 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list)); 1197 } 1198 1199 #ifdef CONFIG_PROC_FS 1200 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1201 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1202 static void nfs_server_list_stop(struct seq_file *p, void *v); 1203 static int nfs_server_list_show(struct seq_file *m, void *v); 1204 1205 static const struct seq_operations nfs_server_list_ops = { 1206 .start = nfs_server_list_start, 1207 .next = nfs_server_list_next, 1208 .stop = nfs_server_list_stop, 1209 .show = nfs_server_list_show, 1210 }; 1211 1212 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1213 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1214 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1215 static int nfs_volume_list_show(struct seq_file *m, void *v); 1216 1217 static const struct seq_operations nfs_volume_list_ops = { 1218 .start = nfs_volume_list_start, 1219 .next = nfs_volume_list_next, 1220 .stop = nfs_volume_list_stop, 1221 .show = nfs_volume_list_show, 1222 }; 1223 1224 /* 1225 * set up the iterator to start reading from the server list and return the first item 1226 */ 1227 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1228 __acquires(&nn->nfs_client_lock) 1229 { 1230 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1231 1232 /* lock the list against modification */ 1233 spin_lock(&nn->nfs_client_lock); 1234 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1235 } 1236 1237 /* 1238 * move to next server 1239 */ 1240 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1241 { 1242 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1243 1244 return seq_list_next(v, &nn->nfs_client_list, pos); 1245 } 1246 1247 /* 1248 * clean up after reading from the transports list 1249 */ 1250 static void nfs_server_list_stop(struct seq_file *p, void *v) 1251 __releases(&nn->nfs_client_lock) 1252 { 1253 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1254 1255 spin_unlock(&nn->nfs_client_lock); 1256 } 1257 1258 /* 1259 * display a header line followed by a load of call lines 1260 */ 1261 static int nfs_server_list_show(struct seq_file *m, void *v) 1262 { 1263 struct nfs_client *clp; 1264 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1265 1266 /* display header on line 1 */ 1267 if (v == &nn->nfs_client_list) { 1268 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1269 return 0; 1270 } 1271 1272 /* display one transport per line on subsequent lines */ 1273 clp = list_entry(v, struct nfs_client, cl_share_link); 1274 1275 /* Check if the client is initialized */ 1276 if (clp->cl_cons_state != NFS_CS_READY) 1277 return 0; 1278 1279 rcu_read_lock(); 1280 seq_printf(m, "v%u %s %s %3d %s\n", 1281 clp->rpc_ops->version, 1282 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1283 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1284 refcount_read(&clp->cl_count), 1285 clp->cl_hostname); 1286 rcu_read_unlock(); 1287 1288 return 0; 1289 } 1290 1291 /* 1292 * set up the iterator to start reading from the volume list and return the first item 1293 */ 1294 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1295 __acquires(&nn->nfs_client_lock) 1296 { 1297 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1298 1299 /* lock the list against modification */ 1300 spin_lock(&nn->nfs_client_lock); 1301 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1302 } 1303 1304 /* 1305 * move to next volume 1306 */ 1307 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1308 { 1309 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1310 1311 return seq_list_next(v, &nn->nfs_volume_list, pos); 1312 } 1313 1314 /* 1315 * clean up after reading from the transports list 1316 */ 1317 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1318 __releases(&nn->nfs_client_lock) 1319 { 1320 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1321 1322 spin_unlock(&nn->nfs_client_lock); 1323 } 1324 1325 /* 1326 * display a header line followed by a load of call lines 1327 */ 1328 static int nfs_volume_list_show(struct seq_file *m, void *v) 1329 { 1330 struct nfs_server *server; 1331 struct nfs_client *clp; 1332 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1333 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1334 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1335 1336 /* display header on line 1 */ 1337 if (v == &nn->nfs_volume_list) { 1338 seq_puts(m, "NV SERVER PORT DEV FSID" 1339 " FSC\n"); 1340 return 0; 1341 } 1342 /* display one transport per line on subsequent lines */ 1343 server = list_entry(v, struct nfs_server, master_link); 1344 clp = server->nfs_client; 1345 1346 snprintf(dev, sizeof(dev), "%u:%u", 1347 MAJOR(server->s_dev), MINOR(server->s_dev)); 1348 1349 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1350 (unsigned long long) server->fsid.major, 1351 (unsigned long long) server->fsid.minor); 1352 1353 rcu_read_lock(); 1354 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1355 clp->rpc_ops->version, 1356 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1357 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1358 dev, 1359 fsid, 1360 nfs_server_fscache_state(server)); 1361 rcu_read_unlock(); 1362 1363 return 0; 1364 } 1365 1366 int nfs_fs_proc_net_init(struct net *net) 1367 { 1368 struct nfs_net *nn = net_generic(net, nfs_net_id); 1369 struct proc_dir_entry *p; 1370 1371 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1372 if (!nn->proc_nfsfs) 1373 goto error_0; 1374 1375 /* a file of servers with which we're dealing */ 1376 p = proc_create_net("servers", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1377 &nfs_server_list_ops, sizeof(struct seq_net_private)); 1378 if (!p) 1379 goto error_1; 1380 1381 /* a file of volumes that we have mounted */ 1382 p = proc_create_net("volumes", S_IFREG|S_IRUGO, nn->proc_nfsfs, 1383 &nfs_volume_list_ops, sizeof(struct seq_net_private)); 1384 if (!p) 1385 goto error_1; 1386 return 0; 1387 1388 error_1: 1389 remove_proc_subtree("nfsfs", net->proc_net); 1390 error_0: 1391 return -ENOMEM; 1392 } 1393 1394 void nfs_fs_proc_net_exit(struct net *net) 1395 { 1396 remove_proc_subtree("nfsfs", net->proc_net); 1397 } 1398 1399 /* 1400 * initialise the /proc/fs/nfsfs/ directory 1401 */ 1402 int __init nfs_fs_proc_init(void) 1403 { 1404 if (!proc_mkdir("fs/nfsfs", NULL)) 1405 goto error_0; 1406 1407 /* a file of servers with which we're dealing */ 1408 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1409 goto error_1; 1410 1411 /* a file of volumes that we have mounted */ 1412 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1413 goto error_1; 1414 1415 return 0; 1416 error_1: 1417 remove_proc_subtree("fs/nfsfs", NULL); 1418 error_0: 1419 return -ENOMEM; 1420 } 1421 1422 /* 1423 * clean up the /proc/fs/nfsfs/ directory 1424 */ 1425 void nfs_fs_proc_exit(void) 1426 { 1427 remove_proc_subtree("fs/nfsfs", NULL); 1428 ida_destroy(&s_sysfs_ids); 1429 } 1430 1431 #endif /* CONFIG_PROC_FS */ 1432