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 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 201 void nfs_cleanup_cb_ident_idr(struct net *net) 202 { 203 struct nfs_net *nn = net_generic(net, nfs_net_id); 204 205 idr_destroy(&nn->cb_ident_idr); 206 } 207 208 /* nfs_client_lock held */ 209 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 210 { 211 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 212 213 if (clp->cl_cb_ident) 214 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 215 } 216 217 static void pnfs_init_server(struct nfs_server *server) 218 { 219 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 220 } 221 222 #else 223 void nfs_cleanup_cb_ident_idr(struct net *net) 224 { 225 } 226 227 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 228 { 229 } 230 231 static void pnfs_init_server(struct nfs_server *server) 232 { 233 } 234 235 #endif /* CONFIG_NFS_V4 */ 236 237 /* 238 * Destroy a shared client record 239 */ 240 void nfs_free_client(struct nfs_client *clp) 241 { 242 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 243 244 nfs_fscache_release_client_cookie(clp); 245 246 /* -EIO all pending I/O */ 247 if (!IS_ERR(clp->cl_rpcclient)) 248 rpc_shutdown_client(clp->cl_rpcclient); 249 250 if (clp->cl_machine_cred != NULL) 251 put_rpccred(clp->cl_machine_cred); 252 253 put_net(clp->cl_net); 254 put_nfs_version(clp->cl_nfs_mod); 255 kfree(clp->cl_hostname); 256 kfree(clp); 257 258 dprintk("<-- nfs_free_client()\n"); 259 } 260 EXPORT_SYMBOL_GPL(nfs_free_client); 261 262 /* 263 * Release a reference to a shared client record 264 */ 265 void nfs_put_client(struct nfs_client *clp) 266 { 267 struct nfs_net *nn; 268 269 if (!clp) 270 return; 271 272 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 273 nn = net_generic(clp->cl_net, nfs_net_id); 274 275 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 276 list_del(&clp->cl_share_link); 277 nfs_cb_idr_remove_locked(clp); 278 spin_unlock(&nn->nfs_client_lock); 279 280 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 281 282 clp->rpc_ops->free_client(clp); 283 } 284 } 285 EXPORT_SYMBOL_GPL(nfs_put_client); 286 287 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 288 /* 289 * Test if two ip6 socket addresses refer to the same socket by 290 * comparing relevant fields. The padding bytes specifically, are not 291 * compared. sin6_flowinfo is not compared because it only affects QoS 292 * and sin6_scope_id is only compared if the address is "link local" 293 * because "link local" addresses need only be unique to a specific 294 * link. Conversely, ordinary unicast addresses might have different 295 * sin6_scope_id. 296 * 297 * The caller should ensure both socket addresses are AF_INET6. 298 */ 299 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 300 const struct sockaddr *sa2) 301 { 302 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 303 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 304 305 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 306 return 0; 307 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 308 return sin1->sin6_scope_id == sin2->sin6_scope_id; 309 310 return 1; 311 } 312 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 313 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 314 const struct sockaddr *sa2) 315 { 316 return 0; 317 } 318 #endif 319 320 /* 321 * Test if two ip4 socket addresses refer to the same socket, by 322 * comparing relevant fields. The padding bytes specifically, are 323 * not compared. 324 * 325 * The caller should ensure both socket addresses are AF_INET. 326 */ 327 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 328 const struct sockaddr *sa2) 329 { 330 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 331 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 332 333 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 334 } 335 336 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 337 const struct sockaddr *sa2) 338 { 339 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 340 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 341 342 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 343 (sin1->sin6_port == sin2->sin6_port); 344 } 345 346 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 347 const struct sockaddr *sa2) 348 { 349 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 350 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 351 352 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 353 (sin1->sin_port == sin2->sin_port); 354 } 355 356 #if defined(CONFIG_NFS_V4_1) 357 /* 358 * Test if two socket addresses represent the same actual socket, 359 * by comparing (only) relevant fields, excluding the port number. 360 */ 361 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 362 const struct sockaddr *sa2) 363 { 364 if (sa1->sa_family != sa2->sa_family) 365 return 0; 366 367 switch (sa1->sa_family) { 368 case AF_INET: 369 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 370 case AF_INET6: 371 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 372 } 373 return 0; 374 } 375 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr); 376 #endif /* CONFIG_NFS_V4_1 */ 377 378 /* 379 * Test if two socket addresses represent the same actual socket, 380 * by comparing (only) relevant fields, including the port number. 381 */ 382 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 383 const struct sockaddr *sa2) 384 { 385 if (sa1->sa_family != sa2->sa_family) 386 return 0; 387 388 switch (sa1->sa_family) { 389 case AF_INET: 390 return nfs_sockaddr_cmp_ip4(sa1, sa2); 391 case AF_INET6: 392 return nfs_sockaddr_cmp_ip6(sa1, sa2); 393 } 394 return 0; 395 } 396 397 /* 398 * Find an nfs_client on the list that matches the initialisation data 399 * that is supplied. 400 */ 401 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 402 { 403 struct nfs_client *clp; 404 const struct sockaddr *sap = data->addr; 405 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 406 407 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 408 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 409 /* Don't match clients that failed to initialise properly */ 410 if (clp->cl_cons_state < 0) 411 continue; 412 413 /* Different NFS versions cannot share the same nfs_client */ 414 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 415 continue; 416 417 if (clp->cl_proto != data->proto) 418 continue; 419 /* Match nfsv4 minorversion */ 420 if (clp->cl_minorversion != data->minorversion) 421 continue; 422 /* Match the full socket address */ 423 if (!nfs_sockaddr_cmp(sap, clap)) 424 continue; 425 426 atomic_inc(&clp->cl_count); 427 return clp; 428 } 429 return NULL; 430 } 431 432 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 433 { 434 return clp->cl_cons_state != NFS_CS_INITING; 435 } 436 437 int nfs_wait_client_init_complete(const struct nfs_client *clp) 438 { 439 return wait_event_killable(nfs_client_active_wq, 440 nfs_client_init_is_complete(clp)); 441 } 442 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 443 444 /* 445 * Found an existing client. Make sure it's ready before returning. 446 */ 447 static struct nfs_client * 448 nfs_found_client(const struct nfs_client_initdata *cl_init, 449 struct nfs_client *clp) 450 { 451 int error; 452 453 error = nfs_wait_client_init_complete(clp); 454 if (error < 0) { 455 nfs_put_client(clp); 456 return ERR_PTR(-ERESTARTSYS); 457 } 458 459 if (clp->cl_cons_state < NFS_CS_READY) { 460 error = clp->cl_cons_state; 461 nfs_put_client(clp); 462 return ERR_PTR(error); 463 } 464 465 smp_rmb(); 466 467 dprintk("<-- %s found nfs_client %p for %s\n", 468 __func__, clp, cl_init->hostname ?: ""); 469 return clp; 470 } 471 472 /* 473 * Look up a client by IP address and protocol version 474 * - creates a new record if one doesn't yet exist 475 */ 476 struct nfs_client * 477 nfs_get_client(const struct nfs_client_initdata *cl_init, 478 const struct rpc_timeout *timeparms, 479 const char *ip_addr, 480 rpc_authflavor_t authflavour) 481 { 482 struct nfs_client *clp, *new = NULL; 483 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 484 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 485 486 dprintk("--> nfs_get_client(%s,v%u)\n", 487 cl_init->hostname ?: "", rpc_ops->version); 488 489 /* see if the client already exists */ 490 do { 491 spin_lock(&nn->nfs_client_lock); 492 493 clp = nfs_match_client(cl_init); 494 if (clp) { 495 spin_unlock(&nn->nfs_client_lock); 496 if (new) 497 new->rpc_ops->free_client(new); 498 return nfs_found_client(cl_init, clp); 499 } 500 if (new) { 501 list_add_tail(&new->cl_share_link, 502 &nn->nfs_client_list); 503 spin_unlock(&nn->nfs_client_lock); 504 new->cl_flags = cl_init->init_flags; 505 return rpc_ops->init_client(new, timeparms, ip_addr, 506 authflavour); 507 } 508 509 spin_unlock(&nn->nfs_client_lock); 510 511 new = rpc_ops->alloc_client(cl_init); 512 } while (!IS_ERR(new)); 513 514 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 515 cl_init->hostname ?: "", PTR_ERR(new)); 516 return new; 517 } 518 EXPORT_SYMBOL_GPL(nfs_get_client); 519 520 /* 521 * Mark a server as ready or failed 522 */ 523 void nfs_mark_client_ready(struct nfs_client *clp, int state) 524 { 525 smp_wmb(); 526 clp->cl_cons_state = state; 527 wake_up_all(&nfs_client_active_wq); 528 } 529 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 530 531 /* 532 * Initialise the timeout values for a connection 533 */ 534 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 535 unsigned int timeo, unsigned int retrans) 536 { 537 to->to_initval = timeo * HZ / 10; 538 to->to_retries = retrans; 539 540 switch (proto) { 541 case XPRT_TRANSPORT_TCP: 542 case XPRT_TRANSPORT_RDMA: 543 if (to->to_retries == 0) 544 to->to_retries = NFS_DEF_TCP_RETRANS; 545 if (to->to_initval == 0) 546 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 547 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 548 to->to_initval = NFS_MAX_TCP_TIMEOUT; 549 to->to_increment = to->to_initval; 550 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 551 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 552 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 553 if (to->to_maxval < to->to_initval) 554 to->to_maxval = to->to_initval; 555 to->to_exponential = 0; 556 break; 557 case XPRT_TRANSPORT_UDP: 558 if (to->to_retries == 0) 559 to->to_retries = NFS_DEF_UDP_RETRANS; 560 if (!to->to_initval) 561 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 562 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 563 to->to_initval = NFS_MAX_UDP_TIMEOUT; 564 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 565 to->to_exponential = 1; 566 break; 567 default: 568 BUG(); 569 } 570 } 571 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 572 573 /* 574 * Create an RPC client handle 575 */ 576 int nfs_create_rpc_client(struct nfs_client *clp, 577 const struct rpc_timeout *timeparms, 578 rpc_authflavor_t flavor) 579 { 580 struct rpc_clnt *clnt = NULL; 581 struct rpc_create_args args = { 582 .net = clp->cl_net, 583 .protocol = clp->cl_proto, 584 .address = (struct sockaddr *)&clp->cl_addr, 585 .addrsize = clp->cl_addrlen, 586 .timeout = timeparms, 587 .servername = clp->cl_hostname, 588 .program = &nfs_program, 589 .version = clp->rpc_ops->version, 590 .authflavor = flavor, 591 }; 592 593 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 594 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 595 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 596 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 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 * @authflavor: authentication flavor for underlying RPC transport 697 * 698 * Returns pointer to an NFS client, or an ERR_PTR value. 699 */ 700 struct nfs_client *nfs_init_client(struct nfs_client *clp, 701 const struct rpc_timeout *timeparms, 702 const char *ip_addr, rpc_authflavor_t authflavour) 703 { 704 int error; 705 706 if (clp->cl_cons_state == NFS_CS_READY) { 707 /* the client is already initialised */ 708 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 709 return clp; 710 } 711 712 /* 713 * Create a client RPC handle for doing FSSTAT with UNIX auth only 714 * - RFC 2623, sec 2.3.2 715 */ 716 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 717 if (error < 0) 718 goto error; 719 nfs_mark_client_ready(clp, NFS_CS_READY); 720 return clp; 721 722 error: 723 nfs_mark_client_ready(clp, error); 724 nfs_put_client(clp); 725 dprintk("<-- nfs_init_client() = xerror %d\n", error); 726 return ERR_PTR(error); 727 } 728 EXPORT_SYMBOL_GPL(nfs_init_client); 729 730 /* 731 * Create a version 2 or 3 client 732 */ 733 static int nfs_init_server(struct nfs_server *server, 734 const struct nfs_parsed_mount_data *data, 735 struct nfs_subversion *nfs_mod) 736 { 737 struct nfs_client_initdata cl_init = { 738 .hostname = data->nfs_server.hostname, 739 .addr = (const struct sockaddr *)&data->nfs_server.address, 740 .addrlen = data->nfs_server.addrlen, 741 .nfs_mod = nfs_mod, 742 .proto = data->nfs_server.protocol, 743 .net = data->net, 744 }; 745 struct rpc_timeout timeparms; 746 struct nfs_client *clp; 747 int error; 748 749 dprintk("--> nfs_init_server()\n"); 750 751 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 752 data->timeo, data->retrans); 753 if (data->flags & NFS_MOUNT_NORESVPORT) 754 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 755 if (server->options & NFS_OPTION_MIGRATION) 756 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 757 758 /* Allocate or find a client reference we can use */ 759 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); 760 if (IS_ERR(clp)) { 761 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 762 return PTR_ERR(clp); 763 } 764 765 server->nfs_client = clp; 766 767 /* Initialise the client representation from the mount data */ 768 server->flags = data->flags; 769 server->options = data->options; 770 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 771 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 772 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR; 773 774 if (data->rsize) 775 server->rsize = nfs_block_size(data->rsize, NULL); 776 if (data->wsize) 777 server->wsize = nfs_block_size(data->wsize, NULL); 778 779 server->acregmin = data->acregmin * HZ; 780 server->acregmax = data->acregmax * HZ; 781 server->acdirmin = data->acdirmin * HZ; 782 server->acdirmax = data->acdirmax * HZ; 783 784 /* Start lockd here, before we might error out */ 785 error = nfs_start_lockd(server); 786 if (error < 0) 787 goto error; 788 789 server->port = data->nfs_server.port; 790 791 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 792 if (error < 0) 793 goto error; 794 795 /* Preserve the values of mount_server-related mount options */ 796 if (data->mount_server.addrlen) { 797 memcpy(&server->mountd_address, &data->mount_server.address, 798 data->mount_server.addrlen); 799 server->mountd_addrlen = data->mount_server.addrlen; 800 } 801 server->mountd_version = data->mount_server.version; 802 server->mountd_port = data->mount_server.port; 803 server->mountd_protocol = data->mount_server.protocol; 804 805 server->namelen = data->namlen; 806 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 807 return 0; 808 809 error: 810 server->nfs_client = NULL; 811 nfs_put_client(clp); 812 dprintk("<-- nfs_init_server() = xerror %d\n", error); 813 return error; 814 } 815 816 /* 817 * Load up the server record from information gained in an fsinfo record 818 */ 819 static void nfs_server_set_fsinfo(struct nfs_server *server, 820 struct nfs_fh *mntfh, 821 struct nfs_fsinfo *fsinfo) 822 { 823 unsigned long max_rpc_payload; 824 825 /* Work out a lot of parameters */ 826 if (server->rsize == 0) 827 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 828 if (server->wsize == 0) 829 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 830 831 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 832 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 833 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 834 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 835 836 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 837 if (server->rsize > max_rpc_payload) 838 server->rsize = max_rpc_payload; 839 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 840 server->rsize = NFS_MAX_FILE_IO_SIZE; 841 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 842 843 server->backing_dev_info.name = "nfs"; 844 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 845 846 if (server->wsize > max_rpc_payload) 847 server->wsize = max_rpc_payload; 848 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 849 server->wsize = NFS_MAX_FILE_IO_SIZE; 850 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 851 852 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 853 854 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 855 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 856 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 857 if (server->dtsize > server->rsize) 858 server->dtsize = server->rsize; 859 860 if (server->flags & NFS_MOUNT_NOAC) { 861 server->acregmin = server->acregmax = 0; 862 server->acdirmin = server->acdirmax = 0; 863 } 864 865 server->maxfilesize = fsinfo->maxfilesize; 866 867 server->time_delta = fsinfo->time_delta; 868 869 /* We're airborne Set socket buffersize */ 870 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 871 } 872 873 /* 874 * Probe filesystem information, including the FSID on v2/v3 875 */ 876 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 877 { 878 struct nfs_fsinfo fsinfo; 879 struct nfs_client *clp = server->nfs_client; 880 int error; 881 882 dprintk("--> nfs_probe_fsinfo()\n"); 883 884 if (clp->rpc_ops->set_capabilities != NULL) { 885 error = clp->rpc_ops->set_capabilities(server, mntfh); 886 if (error < 0) 887 goto out_error; 888 } 889 890 fsinfo.fattr = fattr; 891 fsinfo.layouttype = 0; 892 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 893 if (error < 0) 894 goto out_error; 895 896 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 897 898 /* Get some general file system info */ 899 if (server->namelen == 0) { 900 struct nfs_pathconf pathinfo; 901 902 pathinfo.fattr = fattr; 903 nfs_fattr_init(fattr); 904 905 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 906 server->namelen = pathinfo.max_namelen; 907 } 908 909 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 910 return 0; 911 912 out_error: 913 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 914 return error; 915 } 916 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 917 918 /* 919 * Copy useful information when duplicating a server record 920 */ 921 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 922 { 923 target->flags = source->flags; 924 target->rsize = source->rsize; 925 target->wsize = source->wsize; 926 target->acregmin = source->acregmin; 927 target->acregmax = source->acregmax; 928 target->acdirmin = source->acdirmin; 929 target->acdirmax = source->acdirmax; 930 target->caps = source->caps; 931 target->options = source->options; 932 } 933 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 934 935 void nfs_server_insert_lists(struct nfs_server *server) 936 { 937 struct nfs_client *clp = server->nfs_client; 938 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 939 940 spin_lock(&nn->nfs_client_lock); 941 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 942 list_add_tail(&server->master_link, &nn->nfs_volume_list); 943 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 944 spin_unlock(&nn->nfs_client_lock); 945 946 } 947 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 948 949 static void nfs_server_remove_lists(struct nfs_server *server) 950 { 951 struct nfs_client *clp = server->nfs_client; 952 struct nfs_net *nn; 953 954 if (clp == NULL) 955 return; 956 nn = net_generic(clp->cl_net, nfs_net_id); 957 spin_lock(&nn->nfs_client_lock); 958 list_del_rcu(&server->client_link); 959 if (list_empty(&clp->cl_superblocks)) 960 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 961 list_del(&server->master_link); 962 spin_unlock(&nn->nfs_client_lock); 963 964 synchronize_rcu(); 965 } 966 967 /* 968 * Allocate and initialise a server record 969 */ 970 struct nfs_server *nfs_alloc_server(void) 971 { 972 struct nfs_server *server; 973 974 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 975 if (!server) 976 return NULL; 977 978 server->client = server->client_acl = ERR_PTR(-EINVAL); 979 980 /* Zero out the NFS state stuff */ 981 INIT_LIST_HEAD(&server->client_link); 982 INIT_LIST_HEAD(&server->master_link); 983 INIT_LIST_HEAD(&server->delegations); 984 INIT_LIST_HEAD(&server->layouts); 985 INIT_LIST_HEAD(&server->state_owners_lru); 986 987 atomic_set(&server->active, 0); 988 989 server->io_stats = nfs_alloc_iostats(); 990 if (!server->io_stats) { 991 kfree(server); 992 return NULL; 993 } 994 995 if (bdi_init(&server->backing_dev_info)) { 996 nfs_free_iostats(server->io_stats); 997 kfree(server); 998 return NULL; 999 } 1000 1001 ida_init(&server->openowner_id); 1002 ida_init(&server->lockowner_id); 1003 pnfs_init_server(server); 1004 1005 return server; 1006 } 1007 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1008 1009 /* 1010 * Free up a server record 1011 */ 1012 void nfs_free_server(struct nfs_server *server) 1013 { 1014 dprintk("--> nfs_free_server()\n"); 1015 1016 nfs_server_remove_lists(server); 1017 1018 if (server->destroy != NULL) 1019 server->destroy(server); 1020 1021 if (!IS_ERR(server->client_acl)) 1022 rpc_shutdown_client(server->client_acl); 1023 if (!IS_ERR(server->client)) 1024 rpc_shutdown_client(server->client); 1025 1026 nfs_put_client(server->nfs_client); 1027 1028 ida_destroy(&server->lockowner_id); 1029 ida_destroy(&server->openowner_id); 1030 nfs_free_iostats(server->io_stats); 1031 bdi_destroy(&server->backing_dev_info); 1032 kfree(server); 1033 nfs_release_automount_timer(); 1034 dprintk("<-- nfs_free_server()\n"); 1035 } 1036 EXPORT_SYMBOL_GPL(nfs_free_server); 1037 1038 /* 1039 * Create a version 2 or 3 volume record 1040 * - keyed on server and FSID 1041 */ 1042 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1043 struct nfs_subversion *nfs_mod) 1044 { 1045 struct nfs_server *server; 1046 struct nfs_fattr *fattr; 1047 int error; 1048 1049 server = nfs_alloc_server(); 1050 if (!server) 1051 return ERR_PTR(-ENOMEM); 1052 1053 error = -ENOMEM; 1054 fattr = nfs_alloc_fattr(); 1055 if (fattr == NULL) 1056 goto error; 1057 1058 /* Get a client representation */ 1059 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1060 if (error < 0) 1061 goto error; 1062 1063 /* Probe the root fh to retrieve its FSID */ 1064 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1065 if (error < 0) 1066 goto error; 1067 if (server->nfs_client->rpc_ops->version == 3) { 1068 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1069 server->namelen = NFS3_MAXNAMLEN; 1070 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1071 server->caps |= NFS_CAP_READDIRPLUS; 1072 } else { 1073 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1074 server->namelen = NFS2_MAXNAMLEN; 1075 } 1076 1077 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1078 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr); 1079 if (error < 0) { 1080 dprintk("nfs_create_server: getattr error = %d\n", -error); 1081 goto error; 1082 } 1083 } 1084 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1085 1086 dprintk("Server FSID: %llx:%llx\n", 1087 (unsigned long long) server->fsid.major, 1088 (unsigned long long) server->fsid.minor); 1089 1090 nfs_server_insert_lists(server); 1091 server->mount_time = jiffies; 1092 nfs_free_fattr(fattr); 1093 return server; 1094 1095 error: 1096 nfs_free_fattr(fattr); 1097 nfs_free_server(server); 1098 return ERR_PTR(error); 1099 } 1100 EXPORT_SYMBOL_GPL(nfs_create_server); 1101 1102 /* 1103 * Clone an NFS2, NFS3 or NFS4 server record 1104 */ 1105 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1106 struct nfs_fh *fh, 1107 struct nfs_fattr *fattr, 1108 rpc_authflavor_t flavor) 1109 { 1110 struct nfs_server *server; 1111 struct nfs_fattr *fattr_fsinfo; 1112 int error; 1113 1114 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1115 (unsigned long long) fattr->fsid.major, 1116 (unsigned long long) fattr->fsid.minor); 1117 1118 server = nfs_alloc_server(); 1119 if (!server) 1120 return ERR_PTR(-ENOMEM); 1121 1122 error = -ENOMEM; 1123 fattr_fsinfo = nfs_alloc_fattr(); 1124 if (fattr_fsinfo == NULL) 1125 goto out_free_server; 1126 1127 /* Copy data from the source */ 1128 server->nfs_client = source->nfs_client; 1129 server->destroy = source->destroy; 1130 atomic_inc(&server->nfs_client->cl_count); 1131 nfs_server_copy_userdata(server, source); 1132 1133 server->fsid = fattr->fsid; 1134 1135 error = nfs_init_server_rpcclient(server, 1136 source->client->cl_timeout, 1137 flavor); 1138 if (error < 0) 1139 goto out_free_server; 1140 1141 /* probe the filesystem info for this server filesystem */ 1142 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1143 if (error < 0) 1144 goto out_free_server; 1145 1146 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1147 server->namelen = NFS4_MAXNAMLEN; 1148 1149 dprintk("Cloned FSID: %llx:%llx\n", 1150 (unsigned long long) server->fsid.major, 1151 (unsigned long long) server->fsid.minor); 1152 1153 error = nfs_start_lockd(server); 1154 if (error < 0) 1155 goto out_free_server; 1156 1157 nfs_server_insert_lists(server); 1158 server->mount_time = jiffies; 1159 1160 nfs_free_fattr(fattr_fsinfo); 1161 dprintk("<-- nfs_clone_server() = %p\n", server); 1162 return server; 1163 1164 out_free_server: 1165 nfs_free_fattr(fattr_fsinfo); 1166 nfs_free_server(server); 1167 dprintk("<-- nfs_clone_server() = error %d\n", error); 1168 return ERR_PTR(error); 1169 } 1170 EXPORT_SYMBOL_GPL(nfs_clone_server); 1171 1172 void nfs_clients_init(struct net *net) 1173 { 1174 struct nfs_net *nn = net_generic(net, nfs_net_id); 1175 1176 INIT_LIST_HEAD(&nn->nfs_client_list); 1177 INIT_LIST_HEAD(&nn->nfs_volume_list); 1178 #if IS_ENABLED(CONFIG_NFS_V4) 1179 idr_init(&nn->cb_ident_idr); 1180 #endif 1181 spin_lock_init(&nn->nfs_client_lock); 1182 nn->boot_time = CURRENT_TIME; 1183 } 1184 1185 #ifdef CONFIG_PROC_FS 1186 static struct proc_dir_entry *proc_fs_nfs; 1187 1188 static int nfs_server_list_open(struct inode *inode, struct file *file); 1189 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1190 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1191 static void nfs_server_list_stop(struct seq_file *p, void *v); 1192 static int nfs_server_list_show(struct seq_file *m, void *v); 1193 1194 static const struct seq_operations nfs_server_list_ops = { 1195 .start = nfs_server_list_start, 1196 .next = nfs_server_list_next, 1197 .stop = nfs_server_list_stop, 1198 .show = nfs_server_list_show, 1199 }; 1200 1201 static const struct file_operations nfs_server_list_fops = { 1202 .open = nfs_server_list_open, 1203 .read = seq_read, 1204 .llseek = seq_lseek, 1205 .release = seq_release, 1206 .owner = THIS_MODULE, 1207 }; 1208 1209 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1210 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1211 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1212 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1213 static int nfs_volume_list_show(struct seq_file *m, void *v); 1214 1215 static const struct seq_operations nfs_volume_list_ops = { 1216 .start = nfs_volume_list_start, 1217 .next = nfs_volume_list_next, 1218 .stop = nfs_volume_list_stop, 1219 .show = nfs_volume_list_show, 1220 }; 1221 1222 static const struct file_operations nfs_volume_list_fops = { 1223 .open = nfs_volume_list_open, 1224 .read = seq_read, 1225 .llseek = seq_lseek, 1226 .release = seq_release, 1227 .owner = THIS_MODULE, 1228 }; 1229 1230 /* 1231 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1232 * we're dealing 1233 */ 1234 static int nfs_server_list_open(struct inode *inode, struct file *file) 1235 { 1236 struct seq_file *m; 1237 int ret; 1238 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1239 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1240 1241 ret = seq_open(file, &nfs_server_list_ops); 1242 if (ret < 0) 1243 return ret; 1244 1245 m = file->private_data; 1246 m->private = net; 1247 1248 return 0; 1249 } 1250 1251 /* 1252 * set up the iterator to start reading from the server list and return the first item 1253 */ 1254 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1255 { 1256 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1257 1258 /* lock the list against modification */ 1259 spin_lock(&nn->nfs_client_lock); 1260 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1261 } 1262 1263 /* 1264 * move to next server 1265 */ 1266 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1267 { 1268 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1269 1270 return seq_list_next(v, &nn->nfs_client_list, pos); 1271 } 1272 1273 /* 1274 * clean up after reading from the transports list 1275 */ 1276 static void nfs_server_list_stop(struct seq_file *p, void *v) 1277 { 1278 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1279 1280 spin_unlock(&nn->nfs_client_lock); 1281 } 1282 1283 /* 1284 * display a header line followed by a load of call lines 1285 */ 1286 static int nfs_server_list_show(struct seq_file *m, void *v) 1287 { 1288 struct nfs_client *clp; 1289 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1290 1291 /* display header on line 1 */ 1292 if (v == &nn->nfs_client_list) { 1293 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1294 return 0; 1295 } 1296 1297 /* display one transport per line on subsequent lines */ 1298 clp = list_entry(v, struct nfs_client, cl_share_link); 1299 1300 /* Check if the client is initialized */ 1301 if (clp->cl_cons_state != NFS_CS_READY) 1302 return 0; 1303 1304 rcu_read_lock(); 1305 seq_printf(m, "v%u %s %s %3d %s\n", 1306 clp->rpc_ops->version, 1307 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1308 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1309 atomic_read(&clp->cl_count), 1310 clp->cl_hostname); 1311 rcu_read_unlock(); 1312 1313 return 0; 1314 } 1315 1316 /* 1317 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1318 */ 1319 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1320 { 1321 struct seq_file *m; 1322 int ret; 1323 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1324 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1325 1326 ret = seq_open(file, &nfs_volume_list_ops); 1327 if (ret < 0) 1328 return ret; 1329 1330 m = file->private_data; 1331 m->private = net; 1332 1333 return 0; 1334 } 1335 1336 /* 1337 * set up the iterator to start reading from the volume list and return the first item 1338 */ 1339 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1340 { 1341 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1342 1343 /* lock the list against modification */ 1344 spin_lock(&nn->nfs_client_lock); 1345 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1346 } 1347 1348 /* 1349 * move to next volume 1350 */ 1351 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1352 { 1353 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1354 1355 return seq_list_next(v, &nn->nfs_volume_list, pos); 1356 } 1357 1358 /* 1359 * clean up after reading from the transports list 1360 */ 1361 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1362 { 1363 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1364 1365 spin_unlock(&nn->nfs_client_lock); 1366 } 1367 1368 /* 1369 * display a header line followed by a load of call lines 1370 */ 1371 static int nfs_volume_list_show(struct seq_file *m, void *v) 1372 { 1373 struct nfs_server *server; 1374 struct nfs_client *clp; 1375 char dev[8], fsid[17]; 1376 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1377 1378 /* display header on line 1 */ 1379 if (v == &nn->nfs_volume_list) { 1380 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1381 return 0; 1382 } 1383 /* display one transport per line on subsequent lines */ 1384 server = list_entry(v, struct nfs_server, master_link); 1385 clp = server->nfs_client; 1386 1387 snprintf(dev, 8, "%u:%u", 1388 MAJOR(server->s_dev), MINOR(server->s_dev)); 1389 1390 snprintf(fsid, 17, "%llx:%llx", 1391 (unsigned long long) server->fsid.major, 1392 (unsigned long long) server->fsid.minor); 1393 1394 rcu_read_lock(); 1395 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1396 clp->rpc_ops->version, 1397 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1398 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1399 dev, 1400 fsid, 1401 nfs_server_fscache_state(server)); 1402 rcu_read_unlock(); 1403 1404 return 0; 1405 } 1406 1407 /* 1408 * initialise the /proc/fs/nfsfs/ directory 1409 */ 1410 int __init nfs_fs_proc_init(void) 1411 { 1412 struct proc_dir_entry *p; 1413 1414 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1415 if (!proc_fs_nfs) 1416 goto error_0; 1417 1418 /* a file of servers with which we're dealing */ 1419 p = proc_create("servers", S_IFREG|S_IRUGO, 1420 proc_fs_nfs, &nfs_server_list_fops); 1421 if (!p) 1422 goto error_1; 1423 1424 /* a file of volumes that we have mounted */ 1425 p = proc_create("volumes", S_IFREG|S_IRUGO, 1426 proc_fs_nfs, &nfs_volume_list_fops); 1427 if (!p) 1428 goto error_2; 1429 return 0; 1430 1431 error_2: 1432 remove_proc_entry("servers", proc_fs_nfs); 1433 error_1: 1434 remove_proc_entry("fs/nfsfs", NULL); 1435 error_0: 1436 return -ENOMEM; 1437 } 1438 1439 /* 1440 * clean up the /proc/fs/nfsfs/ directory 1441 */ 1442 void nfs_fs_proc_exit(void) 1443 { 1444 remove_proc_entry("volumes", proc_fs_nfs); 1445 remove_proc_entry("servers", proc_fs_nfs); 1446 remove_proc_entry("fs/nfsfs", NULL); 1447 } 1448 1449 #endif /* CONFIG_PROC_FS */ 1450