1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <linux/idr.h> 40 #include <net/ipv6.h> 41 #include <linux/nfs_xdr.h> 42 #include <linux/sunrpc/bc_xprt.h> 43 #include <linux/nsproxy.h> 44 #include <linux/pid_namespace.h> 45 46 47 #include "nfs4_fs.h" 48 #include "callback.h" 49 #include "delegation.h" 50 #include "iostat.h" 51 #include "internal.h" 52 #include "fscache.h" 53 #include "pnfs.h" 54 #include "nfs.h" 55 #include "netns.h" 56 57 #define NFSDBG_FACILITY NFSDBG_CLIENT 58 59 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 60 static DEFINE_SPINLOCK(nfs_version_lock); 61 static DEFINE_MUTEX(nfs_version_mutex); 62 static LIST_HEAD(nfs_versions); 63 64 /* 65 * RPC cruft for NFS 66 */ 67 static const struct rpc_version *nfs_version[5] = { 68 [2] = NULL, 69 [3] = NULL, 70 [4] = NULL, 71 }; 72 73 const struct rpc_program nfs_program = { 74 .name = "nfs", 75 .number = NFS_PROGRAM, 76 .nrvers = ARRAY_SIZE(nfs_version), 77 .version = nfs_version, 78 .stats = &nfs_rpcstat, 79 .pipe_dir_name = NFS_PIPE_DIRNAME, 80 }; 81 82 struct rpc_stat nfs_rpcstat = { 83 .program = &nfs_program 84 }; 85 86 static struct nfs_subversion *find_nfs_version(unsigned int version) 87 { 88 struct nfs_subversion *nfs; 89 spin_lock(&nfs_version_lock); 90 91 list_for_each_entry(nfs, &nfs_versions, list) { 92 if (nfs->rpc_ops->version == version) { 93 spin_unlock(&nfs_version_lock); 94 return nfs; 95 } 96 } 97 98 spin_unlock(&nfs_version_lock); 99 return ERR_PTR(-EPROTONOSUPPORT); 100 } 101 102 struct nfs_subversion *get_nfs_version(unsigned int version) 103 { 104 struct nfs_subversion *nfs = find_nfs_version(version); 105 106 if (IS_ERR(nfs)) { 107 mutex_lock(&nfs_version_mutex); 108 request_module("nfsv%d", version); 109 nfs = find_nfs_version(version); 110 mutex_unlock(&nfs_version_mutex); 111 } 112 113 if (!IS_ERR(nfs)) 114 try_module_get(nfs->owner); 115 return nfs; 116 } 117 118 void put_nfs_version(struct nfs_subversion *nfs) 119 { 120 module_put(nfs->owner); 121 } 122 123 void register_nfs_version(struct nfs_subversion *nfs) 124 { 125 spin_lock(&nfs_version_lock); 126 127 list_add(&nfs->list, &nfs_versions); 128 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 129 130 spin_unlock(&nfs_version_lock); 131 } 132 EXPORT_SYMBOL_GPL(register_nfs_version); 133 134 void unregister_nfs_version(struct nfs_subversion *nfs) 135 { 136 spin_lock(&nfs_version_lock); 137 138 nfs_version[nfs->rpc_ops->version] = NULL; 139 list_del(&nfs->list); 140 141 spin_unlock(&nfs_version_lock); 142 } 143 EXPORT_SYMBOL_GPL(unregister_nfs_version); 144 145 /* 146 * Allocate a shared client record 147 * 148 * Since these are allocated/deallocated very rarely, we don't 149 * bother putting them in a slab cache... 150 */ 151 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 152 { 153 struct nfs_client *clp; 154 struct rpc_cred *cred; 155 int err = -ENOMEM; 156 157 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 158 goto error_0; 159 160 clp->cl_nfs_mod = cl_init->nfs_mod; 161 try_module_get(clp->cl_nfs_mod->owner); 162 163 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 164 165 atomic_set(&clp->cl_count, 1); 166 clp->cl_cons_state = NFS_CS_INITING; 167 168 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 169 clp->cl_addrlen = cl_init->addrlen; 170 171 if (cl_init->hostname) { 172 err = -ENOMEM; 173 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 174 if (!clp->cl_hostname) 175 goto error_cleanup; 176 } 177 178 INIT_LIST_HEAD(&clp->cl_superblocks); 179 clp->cl_rpcclient = ERR_PTR(-EINVAL); 180 181 clp->cl_proto = cl_init->proto; 182 clp->cl_net = get_net(cl_init->net); 183 184 cred = rpc_lookup_machine_cred("*"); 185 if (!IS_ERR(cred)) 186 clp->cl_machine_cred = cred; 187 nfs_fscache_get_client_cookie(clp); 188 189 return clp; 190 191 error_cleanup: 192 put_nfs_version(clp->cl_nfs_mod); 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 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 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 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 242 243 nfs_fscache_release_client_cookie(clp); 244 245 /* -EIO all pending I/O */ 246 if (!IS_ERR(clp->cl_rpcclient)) 247 rpc_shutdown_client(clp->cl_rpcclient); 248 249 if (clp->cl_machine_cred != NULL) 250 put_rpccred(clp->cl_machine_cred); 251 252 put_net(clp->cl_net); 253 put_nfs_version(clp->cl_nfs_mod); 254 kfree(clp->cl_hostname); 255 kfree(clp); 256 257 dprintk("<-- nfs_free_client()\n"); 258 } 259 EXPORT_SYMBOL_GPL(nfs_free_client); 260 261 /* 262 * Release a reference to a shared client record 263 */ 264 void nfs_put_client(struct nfs_client *clp) 265 { 266 struct nfs_net *nn; 267 268 if (!clp) 269 return; 270 271 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 272 nn = net_generic(clp->cl_net, nfs_net_id); 273 274 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 275 list_del(&clp->cl_share_link); 276 nfs_cb_idr_remove_locked(clp); 277 spin_unlock(&nn->nfs_client_lock); 278 279 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 280 281 clp->rpc_ops->free_client(clp); 282 } 283 } 284 EXPORT_SYMBOL_GPL(nfs_put_client); 285 286 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 287 /* 288 * Test if two ip6 socket addresses refer to the same socket by 289 * comparing relevant fields. The padding bytes specifically, are not 290 * compared. sin6_flowinfo is not compared because it only affects QoS 291 * and sin6_scope_id is only compared if the address is "link local" 292 * because "link local" addresses need only be unique to a specific 293 * link. Conversely, ordinary unicast addresses might have different 294 * sin6_scope_id. 295 * 296 * The caller should ensure both socket addresses are AF_INET6. 297 */ 298 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 299 const struct sockaddr *sa2) 300 { 301 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 302 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 303 304 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 305 return 0; 306 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 307 return sin1->sin6_scope_id == sin2->sin6_scope_id; 308 309 return 1; 310 } 311 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 312 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 313 const struct sockaddr *sa2) 314 { 315 return 0; 316 } 317 #endif 318 319 /* 320 * Test if two ip4 socket addresses refer to the same socket, by 321 * comparing relevant fields. The padding bytes specifically, are 322 * not compared. 323 * 324 * The caller should ensure both socket addresses are AF_INET. 325 */ 326 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 327 const struct sockaddr *sa2) 328 { 329 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 330 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 331 332 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 333 } 334 335 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 336 const struct sockaddr *sa2) 337 { 338 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 339 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 340 341 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 342 (sin1->sin6_port == sin2->sin6_port); 343 } 344 345 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 346 const struct sockaddr *sa2) 347 { 348 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 349 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 350 351 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 352 (sin1->sin_port == sin2->sin_port); 353 } 354 355 #if defined(CONFIG_NFS_V4_1) 356 /* 357 * Test if two socket addresses represent the same actual socket, 358 * by comparing (only) relevant fields, excluding the port number. 359 */ 360 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 361 const struct sockaddr *sa2) 362 { 363 if (sa1->sa_family != sa2->sa_family) 364 return 0; 365 366 switch (sa1->sa_family) { 367 case AF_INET: 368 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 369 case AF_INET6: 370 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 371 } 372 return 0; 373 } 374 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr); 375 #endif /* CONFIG_NFS_V4_1 */ 376 377 /* 378 * Test if two socket addresses represent the same actual socket, 379 * by comparing (only) relevant fields, including the port number. 380 */ 381 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 382 const struct sockaddr *sa2) 383 { 384 if (sa1->sa_family != sa2->sa_family) 385 return 0; 386 387 switch (sa1->sa_family) { 388 case AF_INET: 389 return nfs_sockaddr_cmp_ip4(sa1, sa2); 390 case AF_INET6: 391 return nfs_sockaddr_cmp_ip6(sa1, sa2); 392 } 393 return 0; 394 } 395 396 /* 397 * Find an nfs_client on the list that matches the initialisation data 398 * that is supplied. 399 */ 400 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 401 { 402 struct nfs_client *clp; 403 const struct sockaddr *sap = data->addr; 404 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 405 406 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 407 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 408 /* Don't match clients that failed to initialise properly */ 409 if (clp->cl_cons_state < 0) 410 continue; 411 412 /* Different NFS versions cannot share the same nfs_client */ 413 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 414 continue; 415 416 if (clp->cl_proto != data->proto) 417 continue; 418 /* Match nfsv4 minorversion */ 419 if (clp->cl_minorversion != data->minorversion) 420 continue; 421 /* Match the full socket address */ 422 if (!nfs_sockaddr_cmp(sap, clap)) 423 continue; 424 425 atomic_inc(&clp->cl_count); 426 return clp; 427 } 428 return NULL; 429 } 430 431 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 432 { 433 return clp->cl_cons_state != NFS_CS_INITING; 434 } 435 436 int nfs_wait_client_init_complete(const struct nfs_client *clp) 437 { 438 return wait_event_killable(nfs_client_active_wq, 439 nfs_client_init_is_complete(clp)); 440 } 441 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 442 443 /* 444 * Found an existing client. Make sure it's ready before returning. 445 */ 446 static struct nfs_client * 447 nfs_found_client(const struct nfs_client_initdata *cl_init, 448 struct nfs_client *clp) 449 { 450 int error; 451 452 error = nfs_wait_client_init_complete(clp); 453 if (error < 0) { 454 nfs_put_client(clp); 455 return ERR_PTR(-ERESTARTSYS); 456 } 457 458 if (clp->cl_cons_state < NFS_CS_READY) { 459 error = clp->cl_cons_state; 460 nfs_put_client(clp); 461 return ERR_PTR(error); 462 } 463 464 smp_rmb(); 465 466 dprintk("<-- %s found nfs_client %p for %s\n", 467 __func__, clp, cl_init->hostname ?: ""); 468 return clp; 469 } 470 471 /* 472 * Look up a client by IP address and protocol version 473 * - creates a new record if one doesn't yet exist 474 */ 475 struct nfs_client * 476 nfs_get_client(const struct nfs_client_initdata *cl_init, 477 const struct rpc_timeout *timeparms, 478 const char *ip_addr, 479 rpc_authflavor_t authflavour) 480 { 481 struct nfs_client *clp, *new = NULL; 482 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 483 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 484 485 dprintk("--> nfs_get_client(%s,v%u)\n", 486 cl_init->hostname ?: "", rpc_ops->version); 487 488 /* see if the client already exists */ 489 do { 490 spin_lock(&nn->nfs_client_lock); 491 492 clp = nfs_match_client(cl_init); 493 if (clp) { 494 spin_unlock(&nn->nfs_client_lock); 495 if (new) 496 new->rpc_ops->free_client(new); 497 return nfs_found_client(cl_init, clp); 498 } 499 if (new) { 500 list_add_tail(&new->cl_share_link, 501 &nn->nfs_client_list); 502 spin_unlock(&nn->nfs_client_lock); 503 new->cl_flags = cl_init->init_flags; 504 return rpc_ops->init_client(new, timeparms, ip_addr); 505 } 506 507 spin_unlock(&nn->nfs_client_lock); 508 509 new = rpc_ops->alloc_client(cl_init); 510 } while (!IS_ERR(new)); 511 512 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 513 cl_init->hostname ?: "", PTR_ERR(new)); 514 return new; 515 } 516 EXPORT_SYMBOL_GPL(nfs_get_client); 517 518 /* 519 * Mark a server as ready or failed 520 */ 521 void nfs_mark_client_ready(struct nfs_client *clp, int state) 522 { 523 smp_wmb(); 524 clp->cl_cons_state = state; 525 wake_up_all(&nfs_client_active_wq); 526 } 527 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 528 529 /* 530 * Initialise the timeout values for a connection 531 */ 532 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 533 unsigned int timeo, unsigned int retrans) 534 { 535 to->to_initval = timeo * HZ / 10; 536 to->to_retries = retrans; 537 538 switch (proto) { 539 case XPRT_TRANSPORT_TCP: 540 case XPRT_TRANSPORT_RDMA: 541 if (to->to_retries == 0) 542 to->to_retries = NFS_DEF_TCP_RETRANS; 543 if (to->to_initval == 0) 544 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 545 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 546 to->to_initval = NFS_MAX_TCP_TIMEOUT; 547 to->to_increment = to->to_initval; 548 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 549 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 550 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 551 if (to->to_maxval < to->to_initval) 552 to->to_maxval = to->to_initval; 553 to->to_exponential = 0; 554 break; 555 case XPRT_TRANSPORT_UDP: 556 if (to->to_retries == 0) 557 to->to_retries = NFS_DEF_UDP_RETRANS; 558 if (!to->to_initval) 559 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 560 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 561 to->to_initval = NFS_MAX_UDP_TIMEOUT; 562 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 563 to->to_exponential = 1; 564 break; 565 default: 566 BUG(); 567 } 568 } 569 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 570 571 /* 572 * Create an RPC client handle 573 */ 574 int nfs_create_rpc_client(struct nfs_client *clp, 575 const struct rpc_timeout *timeparms, 576 rpc_authflavor_t flavor) 577 { 578 struct rpc_clnt *clnt = NULL; 579 struct rpc_create_args args = { 580 .net = clp->cl_net, 581 .protocol = clp->cl_proto, 582 .address = (struct sockaddr *)&clp->cl_addr, 583 .addrsize = clp->cl_addrlen, 584 .timeout = timeparms, 585 .servername = clp->cl_hostname, 586 .program = &nfs_program, 587 .version = clp->rpc_ops->version, 588 .authflavor = flavor, 589 }; 590 591 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 592 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 593 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 594 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 595 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 596 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 597 598 if (!IS_ERR(clp->cl_rpcclient)) 599 return 0; 600 601 clnt = rpc_create(&args); 602 if (IS_ERR(clnt)) { 603 dprintk("%s: cannot create RPC client. Error = %ld\n", 604 __func__, PTR_ERR(clnt)); 605 return PTR_ERR(clnt); 606 } 607 608 clp->cl_rpcclient = clnt; 609 return 0; 610 } 611 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 612 613 /* 614 * Version 2 or 3 client destruction 615 */ 616 static void nfs_destroy_server(struct nfs_server *server) 617 { 618 if (server->nlm_host) 619 nlmclnt_done(server->nlm_host); 620 } 621 622 /* 623 * Version 2 or 3 lockd setup 624 */ 625 static int nfs_start_lockd(struct nfs_server *server) 626 { 627 struct nlm_host *host; 628 struct nfs_client *clp = server->nfs_client; 629 struct nlmclnt_initdata nlm_init = { 630 .hostname = clp->cl_hostname, 631 .address = (struct sockaddr *)&clp->cl_addr, 632 .addrlen = clp->cl_addrlen, 633 .nfs_version = clp->rpc_ops->version, 634 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 635 1 : 0, 636 .net = clp->cl_net, 637 }; 638 639 if (nlm_init.nfs_version > 3) 640 return 0; 641 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 642 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 643 return 0; 644 645 switch (clp->cl_proto) { 646 default: 647 nlm_init.protocol = IPPROTO_TCP; 648 break; 649 case XPRT_TRANSPORT_UDP: 650 nlm_init.protocol = IPPROTO_UDP; 651 } 652 653 host = nlmclnt_init(&nlm_init); 654 if (IS_ERR(host)) 655 return PTR_ERR(host); 656 657 server->nlm_host = host; 658 server->destroy = nfs_destroy_server; 659 return 0; 660 } 661 662 /* 663 * Create a general RPC client 664 */ 665 int nfs_init_server_rpcclient(struct nfs_server *server, 666 const struct rpc_timeout *timeo, 667 rpc_authflavor_t pseudoflavour) 668 { 669 struct nfs_client *clp = server->nfs_client; 670 671 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 672 pseudoflavour); 673 if (IS_ERR(server->client)) { 674 dprintk("%s: couldn't create rpc_client!\n", __func__); 675 return PTR_ERR(server->client); 676 } 677 678 memcpy(&server->client->cl_timeout_default, 679 timeo, 680 sizeof(server->client->cl_timeout_default)); 681 server->client->cl_timeout = &server->client->cl_timeout_default; 682 server->client->cl_softrtry = 0; 683 if (server->flags & NFS_MOUNT_SOFT) 684 server->client->cl_softrtry = 1; 685 686 return 0; 687 } 688 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 689 690 /** 691 * nfs_init_client - Initialise an NFS2 or NFS3 client 692 * 693 * @clp: nfs_client to initialise 694 * @timeparms: timeout parameters for underlying RPC transport 695 * @ip_addr: IP presentation address (not used) 696 * 697 * Returns pointer to an NFS client, or an ERR_PTR value. 698 */ 699 struct nfs_client *nfs_init_client(struct nfs_client *clp, 700 const struct rpc_timeout *timeparms, 701 const char *ip_addr) 702 { 703 int error; 704 705 if (clp->cl_cons_state == NFS_CS_READY) { 706 /* the client is already initialised */ 707 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 708 return clp; 709 } 710 711 /* 712 * Create a client RPC handle for doing FSSTAT with UNIX auth only 713 * - RFC 2623, sec 2.3.2 714 */ 715 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 716 if (error < 0) 717 goto error; 718 nfs_mark_client_ready(clp, NFS_CS_READY); 719 return clp; 720 721 error: 722 nfs_mark_client_ready(clp, error); 723 nfs_put_client(clp); 724 dprintk("<-- nfs_init_client() = xerror %d\n", error); 725 return ERR_PTR(error); 726 } 727 EXPORT_SYMBOL_GPL(nfs_init_client); 728 729 /* 730 * Create a version 2 or 3 client 731 */ 732 static int nfs_init_server(struct nfs_server *server, 733 const struct nfs_parsed_mount_data *data, 734 struct nfs_subversion *nfs_mod) 735 { 736 struct nfs_client_initdata cl_init = { 737 .hostname = data->nfs_server.hostname, 738 .addr = (const struct sockaddr *)&data->nfs_server.address, 739 .addrlen = data->nfs_server.addrlen, 740 .nfs_mod = nfs_mod, 741 .proto = data->nfs_server.protocol, 742 .net = data->net, 743 }; 744 struct rpc_timeout timeparms; 745 struct nfs_client *clp; 746 int error; 747 748 dprintk("--> nfs_init_server()\n"); 749 750 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 751 data->timeo, data->retrans); 752 if (data->flags & NFS_MOUNT_NORESVPORT) 753 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 754 755 /* Allocate or find a client reference we can use */ 756 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); 757 if (IS_ERR(clp)) { 758 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 759 return PTR_ERR(clp); 760 } 761 762 server->nfs_client = clp; 763 764 /* Initialise the client representation from the mount data */ 765 server->flags = data->flags; 766 server->options = data->options; 767 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 768 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 769 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR; 770 771 if (data->rsize) 772 server->rsize = nfs_block_size(data->rsize, NULL); 773 if (data->wsize) 774 server->wsize = nfs_block_size(data->wsize, NULL); 775 776 server->acregmin = data->acregmin * HZ; 777 server->acregmax = data->acregmax * HZ; 778 server->acdirmin = data->acdirmin * HZ; 779 server->acdirmax = data->acdirmax * HZ; 780 781 /* Start lockd here, before we might error out */ 782 error = nfs_start_lockd(server); 783 if (error < 0) 784 goto error; 785 786 server->port = data->nfs_server.port; 787 788 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 789 if (error < 0) 790 goto error; 791 792 /* Preserve the values of mount_server-related mount options */ 793 if (data->mount_server.addrlen) { 794 memcpy(&server->mountd_address, &data->mount_server.address, 795 data->mount_server.addrlen); 796 server->mountd_addrlen = data->mount_server.addrlen; 797 } 798 server->mountd_version = data->mount_server.version; 799 server->mountd_port = data->mount_server.port; 800 server->mountd_protocol = data->mount_server.protocol; 801 802 server->namelen = data->namlen; 803 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 804 return 0; 805 806 error: 807 server->nfs_client = NULL; 808 nfs_put_client(clp); 809 dprintk("<-- nfs_init_server() = xerror %d\n", error); 810 return error; 811 } 812 813 /* 814 * Load up the server record from information gained in an fsinfo record 815 */ 816 static void nfs_server_set_fsinfo(struct nfs_server *server, 817 struct nfs_fh *mntfh, 818 struct nfs_fsinfo *fsinfo) 819 { 820 unsigned long max_rpc_payload; 821 822 /* Work out a lot of parameters */ 823 if (server->rsize == 0) 824 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 825 if (server->wsize == 0) 826 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 827 828 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 829 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 830 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 831 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 832 833 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 834 if (server->rsize > max_rpc_payload) 835 server->rsize = max_rpc_payload; 836 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 837 server->rsize = NFS_MAX_FILE_IO_SIZE; 838 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 839 840 server->backing_dev_info.name = "nfs"; 841 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 842 843 if (server->wsize > max_rpc_payload) 844 server->wsize = max_rpc_payload; 845 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 846 server->wsize = NFS_MAX_FILE_IO_SIZE; 847 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 848 849 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 850 851 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 852 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 853 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 854 if (server->dtsize > server->rsize) 855 server->dtsize = server->rsize; 856 857 if (server->flags & NFS_MOUNT_NOAC) { 858 server->acregmin = server->acregmax = 0; 859 server->acdirmin = server->acdirmax = 0; 860 } 861 862 server->maxfilesize = fsinfo->maxfilesize; 863 864 server->time_delta = fsinfo->time_delta; 865 866 /* We're airborne Set socket buffersize */ 867 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 868 } 869 870 /* 871 * Probe filesystem information, including the FSID on v2/v3 872 */ 873 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 874 { 875 struct nfs_fsinfo fsinfo; 876 struct nfs_client *clp = server->nfs_client; 877 int error; 878 879 dprintk("--> nfs_probe_fsinfo()\n"); 880 881 if (clp->rpc_ops->set_capabilities != NULL) { 882 error = clp->rpc_ops->set_capabilities(server, mntfh); 883 if (error < 0) 884 goto out_error; 885 } 886 887 fsinfo.fattr = fattr; 888 fsinfo.layouttype = 0; 889 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 890 if (error < 0) 891 goto out_error; 892 893 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 894 895 /* Get some general file system info */ 896 if (server->namelen == 0) { 897 struct nfs_pathconf pathinfo; 898 899 pathinfo.fattr = fattr; 900 nfs_fattr_init(fattr); 901 902 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 903 server->namelen = pathinfo.max_namelen; 904 } 905 906 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 907 return 0; 908 909 out_error: 910 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 911 return error; 912 } 913 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 914 915 /* 916 * Copy useful information when duplicating a server record 917 */ 918 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 919 { 920 target->flags = source->flags; 921 target->rsize = source->rsize; 922 target->wsize = source->wsize; 923 target->acregmin = source->acregmin; 924 target->acregmax = source->acregmax; 925 target->acdirmin = source->acdirmin; 926 target->acdirmax = source->acdirmax; 927 target->caps = source->caps; 928 target->options = source->options; 929 } 930 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 931 932 void nfs_server_insert_lists(struct nfs_server *server) 933 { 934 struct nfs_client *clp = server->nfs_client; 935 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 936 937 spin_lock(&nn->nfs_client_lock); 938 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 939 list_add_tail(&server->master_link, &nn->nfs_volume_list); 940 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 941 spin_unlock(&nn->nfs_client_lock); 942 943 } 944 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 945 946 static void nfs_server_remove_lists(struct nfs_server *server) 947 { 948 struct nfs_client *clp = server->nfs_client; 949 struct nfs_net *nn; 950 951 if (clp == NULL) 952 return; 953 nn = net_generic(clp->cl_net, nfs_net_id); 954 spin_lock(&nn->nfs_client_lock); 955 list_del_rcu(&server->client_link); 956 if (list_empty(&clp->cl_superblocks)) 957 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 958 list_del(&server->master_link); 959 spin_unlock(&nn->nfs_client_lock); 960 961 synchronize_rcu(); 962 } 963 964 /* 965 * Allocate and initialise a server record 966 */ 967 struct nfs_server *nfs_alloc_server(void) 968 { 969 struct nfs_server *server; 970 971 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 972 if (!server) 973 return NULL; 974 975 server->client = server->client_acl = ERR_PTR(-EINVAL); 976 977 /* Zero out the NFS state stuff */ 978 INIT_LIST_HEAD(&server->client_link); 979 INIT_LIST_HEAD(&server->master_link); 980 INIT_LIST_HEAD(&server->delegations); 981 INIT_LIST_HEAD(&server->layouts); 982 INIT_LIST_HEAD(&server->state_owners_lru); 983 984 atomic_set(&server->active, 0); 985 986 server->io_stats = nfs_alloc_iostats(); 987 if (!server->io_stats) { 988 kfree(server); 989 return NULL; 990 } 991 992 if (bdi_init(&server->backing_dev_info)) { 993 nfs_free_iostats(server->io_stats); 994 kfree(server); 995 return NULL; 996 } 997 998 ida_init(&server->openowner_id); 999 ida_init(&server->lockowner_id); 1000 pnfs_init_server(server); 1001 1002 return server; 1003 } 1004 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1005 1006 /* 1007 * Free up a server record 1008 */ 1009 void nfs_free_server(struct nfs_server *server) 1010 { 1011 dprintk("--> nfs_free_server()\n"); 1012 1013 nfs_server_remove_lists(server); 1014 1015 if (server->destroy != NULL) 1016 server->destroy(server); 1017 1018 if (!IS_ERR(server->client_acl)) 1019 rpc_shutdown_client(server->client_acl); 1020 if (!IS_ERR(server->client)) 1021 rpc_shutdown_client(server->client); 1022 1023 nfs_put_client(server->nfs_client); 1024 1025 ida_destroy(&server->lockowner_id); 1026 ida_destroy(&server->openowner_id); 1027 nfs_free_iostats(server->io_stats); 1028 bdi_destroy(&server->backing_dev_info); 1029 kfree(server); 1030 nfs_release_automount_timer(); 1031 dprintk("<-- nfs_free_server()\n"); 1032 } 1033 EXPORT_SYMBOL_GPL(nfs_free_server); 1034 1035 /* 1036 * Create a version 2 or 3 volume record 1037 * - keyed on server and FSID 1038 */ 1039 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1040 struct nfs_subversion *nfs_mod) 1041 { 1042 struct nfs_server *server; 1043 struct nfs_fattr *fattr; 1044 int error; 1045 1046 server = nfs_alloc_server(); 1047 if (!server) 1048 return ERR_PTR(-ENOMEM); 1049 1050 error = -ENOMEM; 1051 fattr = nfs_alloc_fattr(); 1052 if (fattr == NULL) 1053 goto error; 1054 1055 /* Get a client representation */ 1056 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1057 if (error < 0) 1058 goto error; 1059 1060 /* Probe the root fh to retrieve its FSID */ 1061 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1062 if (error < 0) 1063 goto error; 1064 if (server->nfs_client->rpc_ops->version == 3) { 1065 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1066 server->namelen = NFS3_MAXNAMLEN; 1067 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1068 server->caps |= NFS_CAP_READDIRPLUS; 1069 } else { 1070 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1071 server->namelen = NFS2_MAXNAMLEN; 1072 } 1073 1074 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1075 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 1076 if (error < 0) { 1077 dprintk("nfs_create_server: getattr error = %d\n", -error); 1078 goto error; 1079 } 1080 } 1081 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1082 1083 dprintk("Server FSID: %llx:%llx\n", 1084 (unsigned long long) server->fsid.major, 1085 (unsigned long long) server->fsid.minor); 1086 1087 nfs_server_insert_lists(server); 1088 server->mount_time = jiffies; 1089 nfs_free_fattr(fattr); 1090 return server; 1091 1092 error: 1093 nfs_free_fattr(fattr); 1094 nfs_free_server(server); 1095 return ERR_PTR(error); 1096 } 1097 EXPORT_SYMBOL_GPL(nfs_create_server); 1098 1099 /* 1100 * Clone an NFS2, NFS3 or NFS4 server record 1101 */ 1102 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1103 struct nfs_fh *fh, 1104 struct nfs_fattr *fattr, 1105 rpc_authflavor_t flavor) 1106 { 1107 struct nfs_server *server; 1108 struct nfs_fattr *fattr_fsinfo; 1109 int error; 1110 1111 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1112 (unsigned long long) fattr->fsid.major, 1113 (unsigned long long) fattr->fsid.minor); 1114 1115 server = nfs_alloc_server(); 1116 if (!server) 1117 return ERR_PTR(-ENOMEM); 1118 1119 error = -ENOMEM; 1120 fattr_fsinfo = nfs_alloc_fattr(); 1121 if (fattr_fsinfo == NULL) 1122 goto out_free_server; 1123 1124 /* Copy data from the source */ 1125 server->nfs_client = source->nfs_client; 1126 server->destroy = source->destroy; 1127 atomic_inc(&server->nfs_client->cl_count); 1128 nfs_server_copy_userdata(server, source); 1129 1130 server->fsid = fattr->fsid; 1131 1132 error = nfs_init_server_rpcclient(server, 1133 source->client->cl_timeout, 1134 flavor); 1135 if (error < 0) 1136 goto out_free_server; 1137 1138 /* probe the filesystem info for this server filesystem */ 1139 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1140 if (error < 0) 1141 goto out_free_server; 1142 1143 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1144 server->namelen = NFS4_MAXNAMLEN; 1145 1146 dprintk("Cloned FSID: %llx:%llx\n", 1147 (unsigned long long) server->fsid.major, 1148 (unsigned long long) server->fsid.minor); 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 nfs_free_fattr(fattr_fsinfo); 1158 dprintk("<-- nfs_clone_server() = %p\n", server); 1159 return server; 1160 1161 out_free_server: 1162 nfs_free_fattr(fattr_fsinfo); 1163 nfs_free_server(server); 1164 dprintk("<-- nfs_clone_server() = error %d\n", error); 1165 return ERR_PTR(error); 1166 } 1167 EXPORT_SYMBOL_GPL(nfs_clone_server); 1168 1169 void nfs_clients_init(struct net *net) 1170 { 1171 struct nfs_net *nn = net_generic(net, nfs_net_id); 1172 1173 INIT_LIST_HEAD(&nn->nfs_client_list); 1174 INIT_LIST_HEAD(&nn->nfs_volume_list); 1175 #if IS_ENABLED(CONFIG_NFS_V4) 1176 idr_init(&nn->cb_ident_idr); 1177 #endif 1178 spin_lock_init(&nn->nfs_client_lock); 1179 nn->boot_time = CURRENT_TIME; 1180 } 1181 1182 #ifdef CONFIG_PROC_FS 1183 static struct proc_dir_entry *proc_fs_nfs; 1184 1185 static int nfs_server_list_open(struct inode *inode, struct file *file); 1186 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1187 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1188 static void nfs_server_list_stop(struct seq_file *p, void *v); 1189 static int nfs_server_list_show(struct seq_file *m, void *v); 1190 1191 static const struct seq_operations nfs_server_list_ops = { 1192 .start = nfs_server_list_start, 1193 .next = nfs_server_list_next, 1194 .stop = nfs_server_list_stop, 1195 .show = nfs_server_list_show, 1196 }; 1197 1198 static const struct file_operations nfs_server_list_fops = { 1199 .open = nfs_server_list_open, 1200 .read = seq_read, 1201 .llseek = seq_lseek, 1202 .release = seq_release, 1203 .owner = THIS_MODULE, 1204 }; 1205 1206 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1207 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1208 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1209 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1210 static int nfs_volume_list_show(struct seq_file *m, void *v); 1211 1212 static const struct seq_operations nfs_volume_list_ops = { 1213 .start = nfs_volume_list_start, 1214 .next = nfs_volume_list_next, 1215 .stop = nfs_volume_list_stop, 1216 .show = nfs_volume_list_show, 1217 }; 1218 1219 static const struct file_operations nfs_volume_list_fops = { 1220 .open = nfs_volume_list_open, 1221 .read = seq_read, 1222 .llseek = seq_lseek, 1223 .release = seq_release, 1224 .owner = THIS_MODULE, 1225 }; 1226 1227 /* 1228 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1229 * we're dealing 1230 */ 1231 static int nfs_server_list_open(struct inode *inode, struct file *file) 1232 { 1233 struct seq_file *m; 1234 int ret; 1235 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1236 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1237 1238 ret = seq_open(file, &nfs_server_list_ops); 1239 if (ret < 0) 1240 return ret; 1241 1242 m = file->private_data; 1243 m->private = net; 1244 1245 return 0; 1246 } 1247 1248 /* 1249 * set up the iterator to start reading from the server list and return the first item 1250 */ 1251 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1252 { 1253 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1254 1255 /* lock the list against modification */ 1256 spin_lock(&nn->nfs_client_lock); 1257 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1258 } 1259 1260 /* 1261 * move to next server 1262 */ 1263 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1264 { 1265 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1266 1267 return seq_list_next(v, &nn->nfs_client_list, pos); 1268 } 1269 1270 /* 1271 * clean up after reading from the transports list 1272 */ 1273 static void nfs_server_list_stop(struct seq_file *p, void *v) 1274 { 1275 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1276 1277 spin_unlock(&nn->nfs_client_lock); 1278 } 1279 1280 /* 1281 * display a header line followed by a load of call lines 1282 */ 1283 static int nfs_server_list_show(struct seq_file *m, void *v) 1284 { 1285 struct nfs_client *clp; 1286 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1287 1288 /* display header on line 1 */ 1289 if (v == &nn->nfs_client_list) { 1290 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1291 return 0; 1292 } 1293 1294 /* display one transport per line on subsequent lines */ 1295 clp = list_entry(v, struct nfs_client, cl_share_link); 1296 1297 /* Check if the client is initialized */ 1298 if (clp->cl_cons_state != NFS_CS_READY) 1299 return 0; 1300 1301 rcu_read_lock(); 1302 seq_printf(m, "v%u %s %s %3d %s\n", 1303 clp->rpc_ops->version, 1304 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1305 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1306 atomic_read(&clp->cl_count), 1307 clp->cl_hostname); 1308 rcu_read_unlock(); 1309 1310 return 0; 1311 } 1312 1313 /* 1314 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1315 */ 1316 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1317 { 1318 struct seq_file *m; 1319 int ret; 1320 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1321 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1322 1323 ret = seq_open(file, &nfs_volume_list_ops); 1324 if (ret < 0) 1325 return ret; 1326 1327 m = file->private_data; 1328 m->private = net; 1329 1330 return 0; 1331 } 1332 1333 /* 1334 * set up the iterator to start reading from the volume list and return the first item 1335 */ 1336 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1337 { 1338 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1339 1340 /* lock the list against modification */ 1341 spin_lock(&nn->nfs_client_lock); 1342 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1343 } 1344 1345 /* 1346 * move to next volume 1347 */ 1348 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1349 { 1350 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1351 1352 return seq_list_next(v, &nn->nfs_volume_list, pos); 1353 } 1354 1355 /* 1356 * clean up after reading from the transports list 1357 */ 1358 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1359 { 1360 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1361 1362 spin_unlock(&nn->nfs_client_lock); 1363 } 1364 1365 /* 1366 * display a header line followed by a load of call lines 1367 */ 1368 static int nfs_volume_list_show(struct seq_file *m, void *v) 1369 { 1370 struct nfs_server *server; 1371 struct nfs_client *clp; 1372 char dev[8], fsid[17]; 1373 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1374 1375 /* display header on line 1 */ 1376 if (v == &nn->nfs_volume_list) { 1377 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1378 return 0; 1379 } 1380 /* display one transport per line on subsequent lines */ 1381 server = list_entry(v, struct nfs_server, master_link); 1382 clp = server->nfs_client; 1383 1384 snprintf(dev, 8, "%u:%u", 1385 MAJOR(server->s_dev), MINOR(server->s_dev)); 1386 1387 snprintf(fsid, 17, "%llx:%llx", 1388 (unsigned long long) server->fsid.major, 1389 (unsigned long long) server->fsid.minor); 1390 1391 rcu_read_lock(); 1392 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1393 clp->rpc_ops->version, 1394 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1395 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1396 dev, 1397 fsid, 1398 nfs_server_fscache_state(server)); 1399 rcu_read_unlock(); 1400 1401 return 0; 1402 } 1403 1404 /* 1405 * initialise the /proc/fs/nfsfs/ directory 1406 */ 1407 int __init nfs_fs_proc_init(void) 1408 { 1409 struct proc_dir_entry *p; 1410 1411 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1412 if (!proc_fs_nfs) 1413 goto error_0; 1414 1415 /* a file of servers with which we're dealing */ 1416 p = proc_create("servers", S_IFREG|S_IRUGO, 1417 proc_fs_nfs, &nfs_server_list_fops); 1418 if (!p) 1419 goto error_1; 1420 1421 /* a file of volumes that we have mounted */ 1422 p = proc_create("volumes", S_IFREG|S_IRUGO, 1423 proc_fs_nfs, &nfs_volume_list_fops); 1424 if (!p) 1425 goto error_2; 1426 return 0; 1427 1428 error_2: 1429 remove_proc_entry("servers", proc_fs_nfs); 1430 error_1: 1431 remove_proc_entry("fs/nfsfs", NULL); 1432 error_0: 1433 return -ENOMEM; 1434 } 1435 1436 /* 1437 * clean up the /proc/fs/nfsfs/ directory 1438 */ 1439 void nfs_fs_proc_exit(void) 1440 { 1441 remove_proc_entry("volumes", proc_fs_nfs); 1442 remove_proc_entry("servers", proc_fs_nfs); 1443 remove_proc_entry("fs/nfsfs", NULL); 1444 } 1445 1446 #endif /* CONFIG_PROC_FS */ 1447