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 BUG_ON(!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(&new->cl_share_link, &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 authflavour); 506 } 507 508 spin_unlock(&nn->nfs_client_lock); 509 510 new = rpc_ops->alloc_client(cl_init); 511 } while (!IS_ERR(new)); 512 513 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 514 cl_init->hostname ?: "", PTR_ERR(new)); 515 return new; 516 } 517 EXPORT_SYMBOL_GPL(nfs_get_client); 518 519 /* 520 * Mark a server as ready or failed 521 */ 522 void nfs_mark_client_ready(struct nfs_client *clp, int state) 523 { 524 smp_wmb(); 525 clp->cl_cons_state = state; 526 wake_up_all(&nfs_client_active_wq); 527 } 528 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 529 530 /* 531 * Initialise the timeout values for a connection 532 */ 533 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 534 unsigned int timeo, unsigned int retrans) 535 { 536 to->to_initval = timeo * HZ / 10; 537 to->to_retries = retrans; 538 539 switch (proto) { 540 case XPRT_TRANSPORT_TCP: 541 case XPRT_TRANSPORT_RDMA: 542 if (to->to_retries == 0) 543 to->to_retries = NFS_DEF_TCP_RETRANS; 544 if (to->to_initval == 0) 545 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 546 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 547 to->to_initval = NFS_MAX_TCP_TIMEOUT; 548 to->to_increment = to->to_initval; 549 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 550 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 551 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 552 if (to->to_maxval < to->to_initval) 553 to->to_maxval = to->to_initval; 554 to->to_exponential = 0; 555 break; 556 case XPRT_TRANSPORT_UDP: 557 if (to->to_retries == 0) 558 to->to_retries = NFS_DEF_UDP_RETRANS; 559 if (!to->to_initval) 560 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 561 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 562 to->to_initval = NFS_MAX_UDP_TIMEOUT; 563 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 564 to->to_exponential = 1; 565 break; 566 default: 567 BUG(); 568 } 569 } 570 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 571 572 /* 573 * Create an RPC client handle 574 */ 575 int nfs_create_rpc_client(struct nfs_client *clp, 576 const struct rpc_timeout *timeparms, 577 rpc_authflavor_t flavor) 578 { 579 struct rpc_clnt *clnt = NULL; 580 struct rpc_create_args args = { 581 .net = clp->cl_net, 582 .protocol = clp->cl_proto, 583 .address = (struct sockaddr *)&clp->cl_addr, 584 .addrsize = clp->cl_addrlen, 585 .timeout = timeparms, 586 .servername = clp->cl_hostname, 587 .program = &nfs_program, 588 .version = clp->rpc_ops->version, 589 .authflavor = flavor, 590 }; 591 592 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 593 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 594 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 595 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 596 597 if (!IS_ERR(clp->cl_rpcclient)) 598 return 0; 599 600 clnt = rpc_create(&args); 601 if (IS_ERR(clnt)) { 602 dprintk("%s: cannot create RPC client. Error = %ld\n", 603 __func__, PTR_ERR(clnt)); 604 return PTR_ERR(clnt); 605 } 606 607 clp->cl_rpcclient = clnt; 608 return 0; 609 } 610 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 611 612 /* 613 * Version 2 or 3 client destruction 614 */ 615 static void nfs_destroy_server(struct nfs_server *server) 616 { 617 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 618 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 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(clp->cl_rpcclient); 672 if (IS_ERR(server->client)) { 673 dprintk("%s: couldn't create rpc_client!\n", __func__); 674 return PTR_ERR(server->client); 675 } 676 677 memcpy(&server->client->cl_timeout_default, 678 timeo, 679 sizeof(server->client->cl_timeout_default)); 680 server->client->cl_timeout = &server->client->cl_timeout_default; 681 682 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 683 struct rpc_auth *auth; 684 685 auth = rpcauth_create(pseudoflavour, server->client); 686 if (IS_ERR(auth)) { 687 dprintk("%s: couldn't create credcache!\n", __func__); 688 return PTR_ERR(auth); 689 } 690 } 691 server->client->cl_softrtry = 0; 692 if (server->flags & NFS_MOUNT_SOFT) 693 server->client->cl_softrtry = 1; 694 695 return 0; 696 } 697 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 698 699 /** 700 * nfs_init_client - Initialise an NFS2 or NFS3 client 701 * 702 * @clp: nfs_client to initialise 703 * @timeparms: timeout parameters for underlying RPC transport 704 * @ip_addr: IP presentation address (not used) 705 * @authflavor: authentication flavor for underlying RPC transport 706 * 707 * Returns pointer to an NFS client, or an ERR_PTR value. 708 */ 709 struct nfs_client *nfs_init_client(struct nfs_client *clp, 710 const struct rpc_timeout *timeparms, 711 const char *ip_addr, rpc_authflavor_t authflavour) 712 { 713 int error; 714 715 if (clp->cl_cons_state == NFS_CS_READY) { 716 /* the client is already initialised */ 717 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 718 return clp; 719 } 720 721 /* 722 * Create a client RPC handle for doing FSSTAT with UNIX auth only 723 * - RFC 2623, sec 2.3.2 724 */ 725 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 726 if (error < 0) 727 goto error; 728 nfs_mark_client_ready(clp, NFS_CS_READY); 729 return clp; 730 731 error: 732 nfs_mark_client_ready(clp, error); 733 nfs_put_client(clp); 734 dprintk("<-- nfs_init_client() = xerror %d\n", error); 735 return ERR_PTR(error); 736 } 737 EXPORT_SYMBOL_GPL(nfs_init_client); 738 739 /* 740 * Create a version 2 or 3 client 741 */ 742 static int nfs_init_server(struct nfs_server *server, 743 const struct nfs_parsed_mount_data *data, 744 struct nfs_subversion *nfs_mod) 745 { 746 struct nfs_client_initdata cl_init = { 747 .hostname = data->nfs_server.hostname, 748 .addr = (const struct sockaddr *)&data->nfs_server.address, 749 .addrlen = data->nfs_server.addrlen, 750 .nfs_mod = nfs_mod, 751 .proto = data->nfs_server.protocol, 752 .net = data->net, 753 }; 754 struct rpc_timeout timeparms; 755 struct nfs_client *clp; 756 int error; 757 758 dprintk("--> nfs_init_server()\n"); 759 760 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 761 data->timeo, data->retrans); 762 if (data->flags & NFS_MOUNT_NORESVPORT) 763 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 764 765 /* Allocate or find a client reference we can use */ 766 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); 767 if (IS_ERR(clp)) { 768 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 769 return PTR_ERR(clp); 770 } 771 772 server->nfs_client = clp; 773 774 /* Initialise the client representation from the mount data */ 775 server->flags = data->flags; 776 server->options = data->options; 777 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 778 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 779 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR; 780 781 if (data->rsize) 782 server->rsize = nfs_block_size(data->rsize, NULL); 783 if (data->wsize) 784 server->wsize = nfs_block_size(data->wsize, NULL); 785 786 server->acregmin = data->acregmin * HZ; 787 server->acregmax = data->acregmax * HZ; 788 server->acdirmin = data->acdirmin * HZ; 789 server->acdirmax = data->acdirmax * HZ; 790 791 /* Start lockd here, before we might error out */ 792 error = nfs_start_lockd(server); 793 if (error < 0) 794 goto error; 795 796 server->port = data->nfs_server.port; 797 798 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 799 if (error < 0) 800 goto error; 801 802 /* Preserve the values of mount_server-related mount options */ 803 if (data->mount_server.addrlen) { 804 memcpy(&server->mountd_address, &data->mount_server.address, 805 data->mount_server.addrlen); 806 server->mountd_addrlen = data->mount_server.addrlen; 807 } 808 server->mountd_version = data->mount_server.version; 809 server->mountd_port = data->mount_server.port; 810 server->mountd_protocol = data->mount_server.protocol; 811 812 server->namelen = data->namlen; 813 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 814 return 0; 815 816 error: 817 server->nfs_client = NULL; 818 nfs_put_client(clp); 819 dprintk("<-- nfs_init_server() = xerror %d\n", error); 820 return error; 821 } 822 823 /* 824 * Load up the server record from information gained in an fsinfo record 825 */ 826 static void nfs_server_set_fsinfo(struct nfs_server *server, 827 struct nfs_fh *mntfh, 828 struct nfs_fsinfo *fsinfo) 829 { 830 unsigned long max_rpc_payload; 831 832 /* Work out a lot of parameters */ 833 if (server->rsize == 0) 834 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 835 if (server->wsize == 0) 836 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 837 838 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 839 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 840 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 841 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 842 843 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 844 if (server->rsize > max_rpc_payload) 845 server->rsize = max_rpc_payload; 846 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 847 server->rsize = NFS_MAX_FILE_IO_SIZE; 848 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 849 850 server->backing_dev_info.name = "nfs"; 851 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 852 853 if (server->wsize > max_rpc_payload) 854 server->wsize = max_rpc_payload; 855 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 856 server->wsize = NFS_MAX_FILE_IO_SIZE; 857 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 858 server->pnfs_blksize = fsinfo->blksize; 859 860 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 861 862 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 863 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 864 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 865 if (server->dtsize > server->rsize) 866 server->dtsize = server->rsize; 867 868 if (server->flags & NFS_MOUNT_NOAC) { 869 server->acregmin = server->acregmax = 0; 870 server->acdirmin = server->acdirmax = 0; 871 } 872 873 server->maxfilesize = fsinfo->maxfilesize; 874 875 server->time_delta = fsinfo->time_delta; 876 877 /* We're airborne Set socket buffersize */ 878 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 879 } 880 881 /* 882 * Probe filesystem information, including the FSID on v2/v3 883 */ 884 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 885 { 886 struct nfs_fsinfo fsinfo; 887 struct nfs_client *clp = server->nfs_client; 888 int error; 889 890 dprintk("--> nfs_probe_fsinfo()\n"); 891 892 if (clp->rpc_ops->set_capabilities != NULL) { 893 error = clp->rpc_ops->set_capabilities(server, mntfh); 894 if (error < 0) 895 goto out_error; 896 } 897 898 fsinfo.fattr = fattr; 899 fsinfo.layouttype = 0; 900 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 901 if (error < 0) 902 goto out_error; 903 904 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 905 906 /* Get some general file system info */ 907 if (server->namelen == 0) { 908 struct nfs_pathconf pathinfo; 909 910 pathinfo.fattr = fattr; 911 nfs_fattr_init(fattr); 912 913 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 914 server->namelen = pathinfo.max_namelen; 915 } 916 917 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 918 return 0; 919 920 out_error: 921 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 922 return error; 923 } 924 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 925 926 /* 927 * Copy useful information when duplicating a server record 928 */ 929 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 930 { 931 target->flags = source->flags; 932 target->rsize = source->rsize; 933 target->wsize = source->wsize; 934 target->acregmin = source->acregmin; 935 target->acregmax = source->acregmax; 936 target->acdirmin = source->acdirmin; 937 target->acdirmax = source->acdirmax; 938 target->caps = source->caps; 939 target->options = source->options; 940 } 941 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 942 943 void nfs_server_insert_lists(struct nfs_server *server) 944 { 945 struct nfs_client *clp = server->nfs_client; 946 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 947 948 spin_lock(&nn->nfs_client_lock); 949 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 950 list_add_tail(&server->master_link, &nn->nfs_volume_list); 951 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 952 spin_unlock(&nn->nfs_client_lock); 953 954 } 955 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 956 957 static void nfs_server_remove_lists(struct nfs_server *server) 958 { 959 struct nfs_client *clp = server->nfs_client; 960 struct nfs_net *nn; 961 962 if (clp == NULL) 963 return; 964 nn = net_generic(clp->cl_net, nfs_net_id); 965 spin_lock(&nn->nfs_client_lock); 966 list_del_rcu(&server->client_link); 967 if (list_empty(&clp->cl_superblocks)) 968 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 969 list_del(&server->master_link); 970 spin_unlock(&nn->nfs_client_lock); 971 972 synchronize_rcu(); 973 } 974 975 /* 976 * Allocate and initialise a server record 977 */ 978 struct nfs_server *nfs_alloc_server(void) 979 { 980 struct nfs_server *server; 981 982 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 983 if (!server) 984 return NULL; 985 986 server->client = server->client_acl = ERR_PTR(-EINVAL); 987 988 /* Zero out the NFS state stuff */ 989 INIT_LIST_HEAD(&server->client_link); 990 INIT_LIST_HEAD(&server->master_link); 991 INIT_LIST_HEAD(&server->delegations); 992 INIT_LIST_HEAD(&server->layouts); 993 INIT_LIST_HEAD(&server->state_owners_lru); 994 995 atomic_set(&server->active, 0); 996 997 server->io_stats = nfs_alloc_iostats(); 998 if (!server->io_stats) { 999 kfree(server); 1000 return NULL; 1001 } 1002 1003 if (bdi_init(&server->backing_dev_info)) { 1004 nfs_free_iostats(server->io_stats); 1005 kfree(server); 1006 return NULL; 1007 } 1008 1009 ida_init(&server->openowner_id); 1010 ida_init(&server->lockowner_id); 1011 pnfs_init_server(server); 1012 1013 return server; 1014 } 1015 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1016 1017 /* 1018 * Free up a server record 1019 */ 1020 void nfs_free_server(struct nfs_server *server) 1021 { 1022 dprintk("--> nfs_free_server()\n"); 1023 1024 nfs_server_remove_lists(server); 1025 1026 if (server->destroy != NULL) 1027 server->destroy(server); 1028 1029 if (!IS_ERR(server->client_acl)) 1030 rpc_shutdown_client(server->client_acl); 1031 if (!IS_ERR(server->client)) 1032 rpc_shutdown_client(server->client); 1033 1034 nfs_put_client(server->nfs_client); 1035 1036 ida_destroy(&server->lockowner_id); 1037 ida_destroy(&server->openowner_id); 1038 nfs_free_iostats(server->io_stats); 1039 bdi_destroy(&server->backing_dev_info); 1040 kfree(server); 1041 nfs_release_automount_timer(); 1042 dprintk("<-- nfs_free_server()\n"); 1043 } 1044 EXPORT_SYMBOL_GPL(nfs_free_server); 1045 1046 /* 1047 * Create a version 2 or 3 volume record 1048 * - keyed on server and FSID 1049 */ 1050 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1051 struct nfs_subversion *nfs_mod) 1052 { 1053 struct nfs_server *server; 1054 struct nfs_fattr *fattr; 1055 int error; 1056 1057 server = nfs_alloc_server(); 1058 if (!server) 1059 return ERR_PTR(-ENOMEM); 1060 1061 error = -ENOMEM; 1062 fattr = nfs_alloc_fattr(); 1063 if (fattr == NULL) 1064 goto error; 1065 1066 /* Get a client representation */ 1067 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1068 if (error < 0) 1069 goto error; 1070 1071 BUG_ON(!server->nfs_client); 1072 BUG_ON(!server->nfs_client->rpc_ops); 1073 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1074 1075 /* Probe the root fh to retrieve its FSID */ 1076 error = nfs_probe_fsinfo(server, mount_info->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 (!(mount_info->parsed->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 = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr); 1091 if (error < 0) { 1092 dprintk("nfs_create_server: getattr error = %d\n", -error); 1093 goto error; 1094 } 1095 } 1096 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1097 1098 dprintk("Server FSID: %llx:%llx\n", 1099 (unsigned long long) server->fsid.major, 1100 (unsigned long long) server->fsid.minor); 1101 1102 nfs_server_insert_lists(server); 1103 server->mount_time = jiffies; 1104 nfs_free_fattr(fattr); 1105 return server; 1106 1107 error: 1108 nfs_free_fattr(fattr); 1109 nfs_free_server(server); 1110 return ERR_PTR(error); 1111 } 1112 EXPORT_SYMBOL_GPL(nfs_create_server); 1113 1114 /* 1115 * Clone an NFS2, NFS3 or NFS4 server record 1116 */ 1117 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1118 struct nfs_fh *fh, 1119 struct nfs_fattr *fattr, 1120 rpc_authflavor_t flavor) 1121 { 1122 struct nfs_server *server; 1123 struct nfs_fattr *fattr_fsinfo; 1124 int error; 1125 1126 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1127 (unsigned long long) fattr->fsid.major, 1128 (unsigned long long) fattr->fsid.minor); 1129 1130 server = nfs_alloc_server(); 1131 if (!server) 1132 return ERR_PTR(-ENOMEM); 1133 1134 error = -ENOMEM; 1135 fattr_fsinfo = nfs_alloc_fattr(); 1136 if (fattr_fsinfo == NULL) 1137 goto out_free_server; 1138 1139 /* Copy data from the source */ 1140 server->nfs_client = source->nfs_client; 1141 server->destroy = source->destroy; 1142 atomic_inc(&server->nfs_client->cl_count); 1143 nfs_server_copy_userdata(server, source); 1144 1145 server->fsid = fattr->fsid; 1146 1147 error = nfs_init_server_rpcclient(server, 1148 source->client->cl_timeout, 1149 flavor); 1150 if (error < 0) 1151 goto out_free_server; 1152 1153 /* probe the filesystem info for this server filesystem */ 1154 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1155 if (error < 0) 1156 goto out_free_server; 1157 1158 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1159 server->namelen = NFS4_MAXNAMLEN; 1160 1161 dprintk("Cloned FSID: %llx:%llx\n", 1162 (unsigned long long) server->fsid.major, 1163 (unsigned long long) server->fsid.minor); 1164 1165 error = nfs_start_lockd(server); 1166 if (error < 0) 1167 goto out_free_server; 1168 1169 nfs_server_insert_lists(server); 1170 server->mount_time = jiffies; 1171 1172 nfs_free_fattr(fattr_fsinfo); 1173 dprintk("<-- nfs_clone_server() = %p\n", server); 1174 return server; 1175 1176 out_free_server: 1177 nfs_free_fattr(fattr_fsinfo); 1178 nfs_free_server(server); 1179 dprintk("<-- nfs_clone_server() = error %d\n", error); 1180 return ERR_PTR(error); 1181 } 1182 EXPORT_SYMBOL_GPL(nfs_clone_server); 1183 1184 void nfs_clients_init(struct net *net) 1185 { 1186 struct nfs_net *nn = net_generic(net, nfs_net_id); 1187 1188 INIT_LIST_HEAD(&nn->nfs_client_list); 1189 INIT_LIST_HEAD(&nn->nfs_volume_list); 1190 #if IS_ENABLED(CONFIG_NFS_V4) 1191 idr_init(&nn->cb_ident_idr); 1192 #endif 1193 spin_lock_init(&nn->nfs_client_lock); 1194 nn->boot_time = CURRENT_TIME; 1195 } 1196 1197 #ifdef CONFIG_PROC_FS 1198 static struct proc_dir_entry *proc_fs_nfs; 1199 1200 static int nfs_server_list_open(struct inode *inode, struct file *file); 1201 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1202 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1203 static void nfs_server_list_stop(struct seq_file *p, void *v); 1204 static int nfs_server_list_show(struct seq_file *m, void *v); 1205 1206 static const struct seq_operations nfs_server_list_ops = { 1207 .start = nfs_server_list_start, 1208 .next = nfs_server_list_next, 1209 .stop = nfs_server_list_stop, 1210 .show = nfs_server_list_show, 1211 }; 1212 1213 static const struct file_operations nfs_server_list_fops = { 1214 .open = nfs_server_list_open, 1215 .read = seq_read, 1216 .llseek = seq_lseek, 1217 .release = seq_release, 1218 .owner = THIS_MODULE, 1219 }; 1220 1221 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1222 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1223 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1224 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1225 static int nfs_volume_list_show(struct seq_file *m, void *v); 1226 1227 static const struct seq_operations nfs_volume_list_ops = { 1228 .start = nfs_volume_list_start, 1229 .next = nfs_volume_list_next, 1230 .stop = nfs_volume_list_stop, 1231 .show = nfs_volume_list_show, 1232 }; 1233 1234 static const struct file_operations nfs_volume_list_fops = { 1235 .open = nfs_volume_list_open, 1236 .read = seq_read, 1237 .llseek = seq_lseek, 1238 .release = seq_release, 1239 .owner = THIS_MODULE, 1240 }; 1241 1242 /* 1243 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1244 * we're dealing 1245 */ 1246 static int nfs_server_list_open(struct inode *inode, struct file *file) 1247 { 1248 struct seq_file *m; 1249 int ret; 1250 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1251 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1252 1253 ret = seq_open(file, &nfs_server_list_ops); 1254 if (ret < 0) 1255 return ret; 1256 1257 m = file->private_data; 1258 m->private = net; 1259 1260 return 0; 1261 } 1262 1263 /* 1264 * set up the iterator to start reading from the server list and return the first item 1265 */ 1266 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1267 { 1268 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1269 1270 /* lock the list against modification */ 1271 spin_lock(&nn->nfs_client_lock); 1272 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1273 } 1274 1275 /* 1276 * move to next server 1277 */ 1278 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1279 { 1280 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1281 1282 return seq_list_next(v, &nn->nfs_client_list, pos); 1283 } 1284 1285 /* 1286 * clean up after reading from the transports list 1287 */ 1288 static void nfs_server_list_stop(struct seq_file *p, void *v) 1289 { 1290 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1291 1292 spin_unlock(&nn->nfs_client_lock); 1293 } 1294 1295 /* 1296 * display a header line followed by a load of call lines 1297 */ 1298 static int nfs_server_list_show(struct seq_file *m, void *v) 1299 { 1300 struct nfs_client *clp; 1301 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1302 1303 /* display header on line 1 */ 1304 if (v == &nn->nfs_client_list) { 1305 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1306 return 0; 1307 } 1308 1309 /* display one transport per line on subsequent lines */ 1310 clp = list_entry(v, struct nfs_client, cl_share_link); 1311 1312 /* Check if the client is initialized */ 1313 if (clp->cl_cons_state != NFS_CS_READY) 1314 return 0; 1315 1316 rcu_read_lock(); 1317 seq_printf(m, "v%u %s %s %3d %s\n", 1318 clp->rpc_ops->version, 1319 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1320 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1321 atomic_read(&clp->cl_count), 1322 clp->cl_hostname); 1323 rcu_read_unlock(); 1324 1325 return 0; 1326 } 1327 1328 /* 1329 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1330 */ 1331 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1332 { 1333 struct seq_file *m; 1334 int ret; 1335 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1336 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1337 1338 ret = seq_open(file, &nfs_volume_list_ops); 1339 if (ret < 0) 1340 return ret; 1341 1342 m = file->private_data; 1343 m->private = net; 1344 1345 return 0; 1346 } 1347 1348 /* 1349 * set up the iterator to start reading from the volume list and return the first item 1350 */ 1351 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1352 { 1353 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1354 1355 /* lock the list against modification */ 1356 spin_lock(&nn->nfs_client_lock); 1357 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1358 } 1359 1360 /* 1361 * move to next volume 1362 */ 1363 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1364 { 1365 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1366 1367 return seq_list_next(v, &nn->nfs_volume_list, pos); 1368 } 1369 1370 /* 1371 * clean up after reading from the transports list 1372 */ 1373 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1374 { 1375 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1376 1377 spin_unlock(&nn->nfs_client_lock); 1378 } 1379 1380 /* 1381 * display a header line followed by a load of call lines 1382 */ 1383 static int nfs_volume_list_show(struct seq_file *m, void *v) 1384 { 1385 struct nfs_server *server; 1386 struct nfs_client *clp; 1387 char dev[8], fsid[17]; 1388 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1389 1390 /* display header on line 1 */ 1391 if (v == &nn->nfs_volume_list) { 1392 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1393 return 0; 1394 } 1395 /* display one transport per line on subsequent lines */ 1396 server = list_entry(v, struct nfs_server, master_link); 1397 clp = server->nfs_client; 1398 1399 snprintf(dev, 8, "%u:%u", 1400 MAJOR(server->s_dev), MINOR(server->s_dev)); 1401 1402 snprintf(fsid, 17, "%llx:%llx", 1403 (unsigned long long) server->fsid.major, 1404 (unsigned long long) server->fsid.minor); 1405 1406 rcu_read_lock(); 1407 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1408 clp->rpc_ops->version, 1409 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1410 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1411 dev, 1412 fsid, 1413 nfs_server_fscache_state(server)); 1414 rcu_read_unlock(); 1415 1416 return 0; 1417 } 1418 1419 /* 1420 * initialise the /proc/fs/nfsfs/ directory 1421 */ 1422 int __init nfs_fs_proc_init(void) 1423 { 1424 struct proc_dir_entry *p; 1425 1426 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1427 if (!proc_fs_nfs) 1428 goto error_0; 1429 1430 /* a file of servers with which we're dealing */ 1431 p = proc_create("servers", S_IFREG|S_IRUGO, 1432 proc_fs_nfs, &nfs_server_list_fops); 1433 if (!p) 1434 goto error_1; 1435 1436 /* a file of volumes that we have mounted */ 1437 p = proc_create("volumes", S_IFREG|S_IRUGO, 1438 proc_fs_nfs, &nfs_volume_list_fops); 1439 if (!p) 1440 goto error_2; 1441 return 0; 1442 1443 error_2: 1444 remove_proc_entry("servers", proc_fs_nfs); 1445 error_1: 1446 remove_proc_entry("fs/nfsfs", NULL); 1447 error_0: 1448 return -ENOMEM; 1449 } 1450 1451 /* 1452 * clean up the /proc/fs/nfsfs/ directory 1453 */ 1454 void nfs_fs_proc_exit(void) 1455 { 1456 remove_proc_entry("volumes", proc_fs_nfs); 1457 remove_proc_entry("servers", proc_fs_nfs); 1458 remove_proc_entry("fs/nfsfs", NULL); 1459 } 1460 1461 #endif /* CONFIG_PROC_FS */ 1462