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/vfs.h> 35 #include <linux/inet.h> 36 #include <linux/in6.h> 37 #include <linux/slab.h> 38 #include <linux/idr.h> 39 #include <net/ipv6.h> 40 #include <linux/nfs_xdr.h> 41 #include <linux/sunrpc/bc_xprt.h> 42 #include <linux/nsproxy.h> 43 #include <linux/pid_namespace.h> 44 45 46 #include "nfs4_fs.h" 47 #include "callback.h" 48 #include "delegation.h" 49 #include "iostat.h" 50 #include "internal.h" 51 #include "fscache.h" 52 #include "pnfs.h" 53 #include "nfs.h" 54 #include "netns.h" 55 56 #define NFSDBG_FACILITY NFSDBG_CLIENT 57 58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 59 static DEFINE_SPINLOCK(nfs_version_lock); 60 static DEFINE_MUTEX(nfs_version_mutex); 61 static LIST_HEAD(nfs_versions); 62 63 /* 64 * RPC cruft for NFS 65 */ 66 static const struct rpc_version *nfs_version[5] = { 67 [2] = NULL, 68 [3] = NULL, 69 [4] = NULL, 70 }; 71 72 const struct rpc_program nfs_program = { 73 .name = "nfs", 74 .number = NFS_PROGRAM, 75 .nrvers = ARRAY_SIZE(nfs_version), 76 .version = nfs_version, 77 .stats = &nfs_rpcstat, 78 .pipe_dir_name = NFS_PIPE_DIRNAME, 79 }; 80 81 struct rpc_stat nfs_rpcstat = { 82 .program = &nfs_program 83 }; 84 85 static struct nfs_subversion *find_nfs_version(unsigned int version) 86 { 87 struct nfs_subversion *nfs; 88 spin_lock(&nfs_version_lock); 89 90 list_for_each_entry(nfs, &nfs_versions, list) { 91 if (nfs->rpc_ops->version == version) { 92 spin_unlock(&nfs_version_lock); 93 return nfs; 94 } 95 } 96 97 spin_unlock(&nfs_version_lock); 98 return ERR_PTR(-EPROTONOSUPPORT); 99 } 100 101 struct nfs_subversion *get_nfs_version(unsigned int version) 102 { 103 struct nfs_subversion *nfs = find_nfs_version(version); 104 105 if (IS_ERR(nfs)) { 106 mutex_lock(&nfs_version_mutex); 107 request_module("nfsv%d", version); 108 nfs = find_nfs_version(version); 109 mutex_unlock(&nfs_version_mutex); 110 } 111 112 if (!IS_ERR(nfs) && !try_module_get(nfs->owner)) 113 return ERR_PTR(-EAGAIN); 114 return nfs; 115 } 116 117 void put_nfs_version(struct nfs_subversion *nfs) 118 { 119 module_put(nfs->owner); 120 } 121 122 void register_nfs_version(struct nfs_subversion *nfs) 123 { 124 spin_lock(&nfs_version_lock); 125 126 list_add(&nfs->list, &nfs_versions); 127 nfs_version[nfs->rpc_ops->version] = nfs->rpc_vers; 128 129 spin_unlock(&nfs_version_lock); 130 } 131 EXPORT_SYMBOL_GPL(register_nfs_version); 132 133 void unregister_nfs_version(struct nfs_subversion *nfs) 134 { 135 spin_lock(&nfs_version_lock); 136 137 nfs_version[nfs->rpc_ops->version] = NULL; 138 list_del(&nfs->list); 139 140 spin_unlock(&nfs_version_lock); 141 } 142 EXPORT_SYMBOL_GPL(unregister_nfs_version); 143 144 /* 145 * Allocate a shared client record 146 * 147 * Since these are allocated/deallocated very rarely, we don't 148 * bother putting them in a slab cache... 149 */ 150 struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 151 { 152 struct nfs_client *clp; 153 struct rpc_cred *cred; 154 int err = -ENOMEM; 155 156 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 157 goto error_0; 158 159 clp->cl_nfs_mod = cl_init->nfs_mod; 160 if (!try_module_get(clp->cl_nfs_mod->owner)) 161 goto error_dealloc; 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 error_dealloc: 194 kfree(clp); 195 error_0: 196 return ERR_PTR(err); 197 } 198 EXPORT_SYMBOL_GPL(nfs_alloc_client); 199 200 #if IS_ENABLED(CONFIG_NFS_V4) 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->cl_acceptor); 257 kfree(clp); 258 259 dprintk("<-- nfs_free_client()\n"); 260 } 261 EXPORT_SYMBOL_GPL(nfs_free_client); 262 263 /* 264 * Release a reference to a shared client record 265 */ 266 void nfs_put_client(struct nfs_client *clp) 267 { 268 struct nfs_net *nn; 269 270 if (!clp) 271 return; 272 273 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 274 nn = net_generic(clp->cl_net, nfs_net_id); 275 276 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 277 list_del(&clp->cl_share_link); 278 nfs_cb_idr_remove_locked(clp); 279 spin_unlock(&nn->nfs_client_lock); 280 281 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 282 283 clp->rpc_ops->free_client(clp); 284 } 285 } 286 EXPORT_SYMBOL_GPL(nfs_put_client); 287 288 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 289 /* 290 * Test if two ip6 socket addresses refer to the same socket by 291 * comparing relevant fields. The padding bytes specifically, are not 292 * compared. sin6_flowinfo is not compared because it only affects QoS 293 * and sin6_scope_id is only compared if the address is "link local" 294 * because "link local" addresses need only be unique to a specific 295 * link. Conversely, ordinary unicast addresses might have different 296 * sin6_scope_id. 297 * 298 * The caller should ensure both socket addresses are AF_INET6. 299 */ 300 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 301 const struct sockaddr *sa2) 302 { 303 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 304 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 305 306 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 307 return 0; 308 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 309 return sin1->sin6_scope_id == sin2->sin6_scope_id; 310 311 return 1; 312 } 313 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 314 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 315 const struct sockaddr *sa2) 316 { 317 return 0; 318 } 319 #endif 320 321 /* 322 * Test if two ip4 socket addresses refer to the same socket, by 323 * comparing relevant fields. The padding bytes specifically, are 324 * not compared. 325 * 326 * The caller should ensure both socket addresses are AF_INET. 327 */ 328 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 329 const struct sockaddr *sa2) 330 { 331 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 332 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 333 334 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 335 } 336 337 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 338 const struct sockaddr *sa2) 339 { 340 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 341 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 342 343 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 344 (sin1->sin6_port == sin2->sin6_port); 345 } 346 347 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 348 const struct sockaddr *sa2) 349 { 350 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 351 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 352 353 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 354 (sin1->sin_port == sin2->sin_port); 355 } 356 357 #if defined(CONFIG_NFS_V4_1) 358 /* 359 * Test if two socket addresses represent the same actual socket, 360 * by comparing (only) relevant fields, excluding the port number. 361 */ 362 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 363 const struct sockaddr *sa2) 364 { 365 if (sa1->sa_family != sa2->sa_family) 366 return 0; 367 368 switch (sa1->sa_family) { 369 case AF_INET: 370 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 371 case AF_INET6: 372 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 373 } 374 return 0; 375 } 376 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr); 377 #endif /* CONFIG_NFS_V4_1 */ 378 379 /* 380 * Test if two socket addresses represent the same actual socket, 381 * by comparing (only) relevant fields, including the port number. 382 */ 383 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 384 const struct sockaddr *sa2) 385 { 386 if (sa1->sa_family != sa2->sa_family) 387 return 0; 388 389 switch (sa1->sa_family) { 390 case AF_INET: 391 return nfs_sockaddr_cmp_ip4(sa1, sa2); 392 case AF_INET6: 393 return nfs_sockaddr_cmp_ip6(sa1, sa2); 394 } 395 return 0; 396 } 397 398 /* 399 * Find an nfs_client on the list that matches the initialisation data 400 * that is supplied. 401 */ 402 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 403 { 404 struct nfs_client *clp; 405 const struct sockaddr *sap = data->addr; 406 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 407 408 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 409 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 410 /* Don't match clients that failed to initialise properly */ 411 if (clp->cl_cons_state < 0) 412 continue; 413 414 /* Different NFS versions cannot share the same nfs_client */ 415 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 416 continue; 417 418 if (clp->cl_proto != data->proto) 419 continue; 420 /* Match nfsv4 minorversion */ 421 if (clp->cl_minorversion != data->minorversion) 422 continue; 423 /* Match the full socket address */ 424 if (!nfs_sockaddr_cmp(sap, clap)) 425 continue; 426 427 atomic_inc(&clp->cl_count); 428 return clp; 429 } 430 return NULL; 431 } 432 433 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 434 { 435 return clp->cl_cons_state <= NFS_CS_READY; 436 } 437 438 int nfs_wait_client_init_complete(const struct nfs_client *clp) 439 { 440 return wait_event_killable(nfs_client_active_wq, 441 nfs_client_init_is_complete(clp)); 442 } 443 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 444 445 /* 446 * Found an existing client. Make sure it's ready before returning. 447 */ 448 static struct nfs_client * 449 nfs_found_client(const struct nfs_client_initdata *cl_init, 450 struct nfs_client *clp) 451 { 452 int error; 453 454 error = nfs_wait_client_init_complete(clp); 455 if (error < 0) { 456 nfs_put_client(clp); 457 return ERR_PTR(-ERESTARTSYS); 458 } 459 460 if (clp->cl_cons_state < NFS_CS_READY) { 461 error = clp->cl_cons_state; 462 nfs_put_client(clp); 463 return ERR_PTR(error); 464 } 465 466 smp_rmb(); 467 468 dprintk("<-- %s found nfs_client %p for %s\n", 469 __func__, clp, cl_init->hostname ?: ""); 470 return clp; 471 } 472 473 /* 474 * Look up a client by IP address and protocol version 475 * - creates a new record if one doesn't yet exist 476 */ 477 struct nfs_client * 478 nfs_get_client(const struct nfs_client_initdata *cl_init, 479 const struct rpc_timeout *timeparms, 480 const char *ip_addr, 481 rpc_authflavor_t authflavour) 482 { 483 struct nfs_client *clp, *new = NULL; 484 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 485 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 486 487 if (cl_init->hostname == NULL) { 488 WARN_ON(1); 489 return NULL; 490 } 491 492 dprintk("--> nfs_get_client(%s,v%u)\n", 493 cl_init->hostname, rpc_ops->version); 494 495 /* see if the client already exists */ 496 do { 497 spin_lock(&nn->nfs_client_lock); 498 499 clp = nfs_match_client(cl_init); 500 if (clp) { 501 spin_unlock(&nn->nfs_client_lock); 502 if (new) 503 new->rpc_ops->free_client(new); 504 return nfs_found_client(cl_init, clp); 505 } 506 if (new) { 507 list_add_tail(&new->cl_share_link, 508 &nn->nfs_client_list); 509 spin_unlock(&nn->nfs_client_lock); 510 new->cl_flags = cl_init->init_flags; 511 return rpc_ops->init_client(new, timeparms, ip_addr); 512 } 513 514 spin_unlock(&nn->nfs_client_lock); 515 516 new = rpc_ops->alloc_client(cl_init); 517 } while (!IS_ERR(new)); 518 519 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 520 cl_init->hostname, PTR_ERR(new)); 521 return new; 522 } 523 EXPORT_SYMBOL_GPL(nfs_get_client); 524 525 /* 526 * Mark a server as ready or failed 527 */ 528 void nfs_mark_client_ready(struct nfs_client *clp, int state) 529 { 530 smp_wmb(); 531 clp->cl_cons_state = state; 532 wake_up_all(&nfs_client_active_wq); 533 } 534 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 535 536 /* 537 * Initialise the timeout values for a connection 538 */ 539 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 540 unsigned int timeo, unsigned int retrans) 541 { 542 to->to_initval = timeo * HZ / 10; 543 to->to_retries = retrans; 544 545 switch (proto) { 546 case XPRT_TRANSPORT_TCP: 547 case XPRT_TRANSPORT_RDMA: 548 if (to->to_retries == 0) 549 to->to_retries = NFS_DEF_TCP_RETRANS; 550 if (to->to_initval == 0) 551 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 552 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 553 to->to_initval = NFS_MAX_TCP_TIMEOUT; 554 to->to_increment = to->to_initval; 555 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 556 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 557 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 558 if (to->to_maxval < to->to_initval) 559 to->to_maxval = to->to_initval; 560 to->to_exponential = 0; 561 break; 562 case XPRT_TRANSPORT_UDP: 563 if (to->to_retries == 0) 564 to->to_retries = NFS_DEF_UDP_RETRANS; 565 if (!to->to_initval) 566 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 567 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 568 to->to_initval = NFS_MAX_UDP_TIMEOUT; 569 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 570 to->to_exponential = 1; 571 break; 572 default: 573 BUG(); 574 } 575 } 576 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 577 578 /* 579 * Create an RPC client handle 580 */ 581 int nfs_create_rpc_client(struct nfs_client *clp, 582 const struct rpc_timeout *timeparms, 583 rpc_authflavor_t flavor) 584 { 585 struct rpc_clnt *clnt = NULL; 586 struct rpc_create_args args = { 587 .net = clp->cl_net, 588 .protocol = clp->cl_proto, 589 .address = (struct sockaddr *)&clp->cl_addr, 590 .addrsize = clp->cl_addrlen, 591 .timeout = timeparms, 592 .servername = clp->cl_hostname, 593 .program = &nfs_program, 594 .version = clp->rpc_ops->version, 595 .authflavor = flavor, 596 }; 597 598 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 599 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 600 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 601 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 602 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 603 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 604 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 605 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 606 607 if (!IS_ERR(clp->cl_rpcclient)) 608 return 0; 609 610 clnt = rpc_create(&args); 611 if (IS_ERR(clnt)) { 612 dprintk("%s: cannot create RPC client. Error = %ld\n", 613 __func__, PTR_ERR(clnt)); 614 return PTR_ERR(clnt); 615 } 616 617 clp->cl_rpcclient = clnt; 618 return 0; 619 } 620 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 621 622 /* 623 * Version 2 or 3 client destruction 624 */ 625 static void nfs_destroy_server(struct nfs_server *server) 626 { 627 if (server->nlm_host) 628 nlmclnt_done(server->nlm_host); 629 } 630 631 /* 632 * Version 2 or 3 lockd setup 633 */ 634 static int nfs_start_lockd(struct nfs_server *server) 635 { 636 struct nlm_host *host; 637 struct nfs_client *clp = server->nfs_client; 638 struct nlmclnt_initdata nlm_init = { 639 .hostname = clp->cl_hostname, 640 .address = (struct sockaddr *)&clp->cl_addr, 641 .addrlen = clp->cl_addrlen, 642 .nfs_version = clp->rpc_ops->version, 643 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 644 1 : 0, 645 .net = clp->cl_net, 646 }; 647 648 if (nlm_init.nfs_version > 3) 649 return 0; 650 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 651 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 652 return 0; 653 654 switch (clp->cl_proto) { 655 default: 656 nlm_init.protocol = IPPROTO_TCP; 657 break; 658 case XPRT_TRANSPORT_UDP: 659 nlm_init.protocol = IPPROTO_UDP; 660 } 661 662 host = nlmclnt_init(&nlm_init); 663 if (IS_ERR(host)) 664 return PTR_ERR(host); 665 666 server->nlm_host = host; 667 server->destroy = nfs_destroy_server; 668 return 0; 669 } 670 671 /* 672 * Create a general RPC client 673 */ 674 int nfs_init_server_rpcclient(struct nfs_server *server, 675 const struct rpc_timeout *timeo, 676 rpc_authflavor_t pseudoflavour) 677 { 678 struct nfs_client *clp = server->nfs_client; 679 680 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 681 pseudoflavour); 682 if (IS_ERR(server->client)) { 683 dprintk("%s: couldn't create rpc_client!\n", __func__); 684 return PTR_ERR(server->client); 685 } 686 687 memcpy(&server->client->cl_timeout_default, 688 timeo, 689 sizeof(server->client->cl_timeout_default)); 690 server->client->cl_timeout = &server->client->cl_timeout_default; 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 * 706 * Returns pointer to an NFS client, or an ERR_PTR value. 707 */ 708 struct nfs_client *nfs_init_client(struct nfs_client *clp, 709 const struct rpc_timeout *timeparms, 710 const char *ip_addr) 711 { 712 int error; 713 714 if (clp->cl_cons_state == NFS_CS_READY) { 715 /* the client is already initialised */ 716 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 717 return clp; 718 } 719 720 /* 721 * Create a client RPC handle for doing FSSTAT with UNIX auth only 722 * - RFC 2623, sec 2.3.2 723 */ 724 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 725 if (error < 0) 726 goto error; 727 nfs_mark_client_ready(clp, NFS_CS_READY); 728 return clp; 729 730 error: 731 nfs_mark_client_ready(clp, error); 732 nfs_put_client(clp); 733 dprintk("<-- nfs_init_client() = xerror %d\n", error); 734 return ERR_PTR(error); 735 } 736 EXPORT_SYMBOL_GPL(nfs_init_client); 737 738 /* 739 * Create a version 2 or 3 client 740 */ 741 static int nfs_init_server(struct nfs_server *server, 742 const struct nfs_parsed_mount_data *data, 743 struct nfs_subversion *nfs_mod) 744 { 745 struct nfs_client_initdata cl_init = { 746 .hostname = data->nfs_server.hostname, 747 .addr = (const struct sockaddr *)&data->nfs_server.address, 748 .addrlen = data->nfs_server.addrlen, 749 .nfs_mod = nfs_mod, 750 .proto = data->nfs_server.protocol, 751 .net = data->net, 752 }; 753 struct rpc_timeout timeparms; 754 struct nfs_client *clp; 755 int error; 756 757 dprintk("--> nfs_init_server()\n"); 758 759 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 760 data->timeo, data->retrans); 761 if (data->flags & NFS_MOUNT_NORESVPORT) 762 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 763 764 /* Allocate or find a client reference we can use */ 765 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX); 766 if (IS_ERR(clp)) { 767 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 768 return PTR_ERR(clp); 769 } 770 771 server->nfs_client = clp; 772 773 /* Initialise the client representation from the mount data */ 774 server->flags = data->flags; 775 server->options = data->options; 776 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 777 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 778 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME|NFS_CAP_CHANGE_ATTR; 779 780 if (data->rsize) 781 server->rsize = nfs_block_size(data->rsize, NULL); 782 if (data->wsize) 783 server->wsize = nfs_block_size(data->wsize, NULL); 784 785 server->acregmin = data->acregmin * HZ; 786 server->acregmax = data->acregmax * HZ; 787 server->acdirmin = data->acdirmin * HZ; 788 server->acdirmax = data->acdirmax * HZ; 789 790 /* Start lockd here, before we might error out */ 791 error = nfs_start_lockd(server); 792 if (error < 0) 793 goto error; 794 795 server->port = data->nfs_server.port; 796 server->auth_info = data->auth_info; 797 798 error = nfs_init_server_rpcclient(server, &timeparms, 799 data->selected_flavor); 800 if (error < 0) 801 goto error; 802 803 /* Preserve the values of mount_server-related mount options */ 804 if (data->mount_server.addrlen) { 805 memcpy(&server->mountd_address, &data->mount_server.address, 806 data->mount_server.addrlen); 807 server->mountd_addrlen = data->mount_server.addrlen; 808 } 809 server->mountd_version = data->mount_server.version; 810 server->mountd_port = data->mount_server.port; 811 server->mountd_protocol = data->mount_server.protocol; 812 813 server->namelen = data->namlen; 814 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 815 return 0; 816 817 error: 818 server->nfs_client = NULL; 819 nfs_put_client(clp); 820 dprintk("<-- nfs_init_server() = xerror %d\n", error); 821 return error; 822 } 823 824 /* 825 * Load up the server record from information gained in an fsinfo record 826 */ 827 static void nfs_server_set_fsinfo(struct nfs_server *server, 828 struct nfs_fh *mntfh, 829 struct nfs_fsinfo *fsinfo) 830 { 831 unsigned long max_rpc_payload; 832 833 /* Work out a lot of parameters */ 834 if (server->rsize == 0) 835 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 836 if (server->wsize == 0) 837 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 838 839 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 840 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 841 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 842 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 843 844 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 845 if (server->rsize > max_rpc_payload) 846 server->rsize = max_rpc_payload; 847 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 848 server->rsize = NFS_MAX_FILE_IO_SIZE; 849 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 850 851 server->backing_dev_info.name = "nfs"; 852 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 853 854 if (server->wsize > max_rpc_payload) 855 server->wsize = max_rpc_payload; 856 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 857 server->wsize = NFS_MAX_FILE_IO_SIZE; 858 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 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 target->auth_info = source->auth_info; 941 } 942 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 943 944 void nfs_server_insert_lists(struct nfs_server *server) 945 { 946 struct nfs_client *clp = server->nfs_client; 947 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 948 949 spin_lock(&nn->nfs_client_lock); 950 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 951 list_add_tail(&server->master_link, &nn->nfs_volume_list); 952 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 953 spin_unlock(&nn->nfs_client_lock); 954 955 } 956 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 957 958 void nfs_server_remove_lists(struct nfs_server *server) 959 { 960 struct nfs_client *clp = server->nfs_client; 961 struct nfs_net *nn; 962 963 if (clp == NULL) 964 return; 965 nn = net_generic(clp->cl_net, nfs_net_id); 966 spin_lock(&nn->nfs_client_lock); 967 list_del_rcu(&server->client_link); 968 if (list_empty(&clp->cl_superblocks)) 969 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 970 list_del(&server->master_link); 971 spin_unlock(&nn->nfs_client_lock); 972 973 synchronize_rcu(); 974 } 975 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 976 977 /* 978 * Allocate and initialise a server record 979 */ 980 struct nfs_server *nfs_alloc_server(void) 981 { 982 struct nfs_server *server; 983 984 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 985 if (!server) 986 return NULL; 987 988 server->client = server->client_acl = ERR_PTR(-EINVAL); 989 990 /* Zero out the NFS state stuff */ 991 INIT_LIST_HEAD(&server->client_link); 992 INIT_LIST_HEAD(&server->master_link); 993 INIT_LIST_HEAD(&server->delegations); 994 INIT_LIST_HEAD(&server->layouts); 995 INIT_LIST_HEAD(&server->state_owners_lru); 996 997 atomic_set(&server->active, 0); 998 999 server->io_stats = nfs_alloc_iostats(); 1000 if (!server->io_stats) { 1001 kfree(server); 1002 return NULL; 1003 } 1004 1005 if (bdi_init(&server->backing_dev_info)) { 1006 nfs_free_iostats(server->io_stats); 1007 kfree(server); 1008 return NULL; 1009 } 1010 1011 ida_init(&server->openowner_id); 1012 ida_init(&server->lockowner_id); 1013 pnfs_init_server(server); 1014 1015 return server; 1016 } 1017 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1018 1019 /* 1020 * Free up a server record 1021 */ 1022 void nfs_free_server(struct nfs_server *server) 1023 { 1024 dprintk("--> nfs_free_server()\n"); 1025 1026 nfs_server_remove_lists(server); 1027 1028 if (server->destroy != NULL) 1029 server->destroy(server); 1030 1031 if (!IS_ERR(server->client_acl)) 1032 rpc_shutdown_client(server->client_acl); 1033 if (!IS_ERR(server->client)) 1034 rpc_shutdown_client(server->client); 1035 1036 nfs_put_client(server->nfs_client); 1037 1038 ida_destroy(&server->lockowner_id); 1039 ida_destroy(&server->openowner_id); 1040 nfs_free_iostats(server->io_stats); 1041 bdi_destroy(&server->backing_dev_info); 1042 kfree(server); 1043 nfs_release_automount_timer(); 1044 dprintk("<-- nfs_free_server()\n"); 1045 } 1046 EXPORT_SYMBOL_GPL(nfs_free_server); 1047 1048 /* 1049 * Create a version 2 or 3 volume record 1050 * - keyed on server and FSID 1051 */ 1052 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1053 struct nfs_subversion *nfs_mod) 1054 { 1055 struct nfs_server *server; 1056 struct nfs_fattr *fattr; 1057 int error; 1058 1059 server = nfs_alloc_server(); 1060 if (!server) 1061 return ERR_PTR(-ENOMEM); 1062 1063 error = -ENOMEM; 1064 fattr = nfs_alloc_fattr(); 1065 if (fattr == NULL) 1066 goto error; 1067 1068 /* Get a client representation */ 1069 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1070 if (error < 0) 1071 goto error; 1072 1073 /* Probe the root fh to retrieve its FSID */ 1074 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1075 if (error < 0) 1076 goto error; 1077 if (server->nfs_client->rpc_ops->version == 3) { 1078 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1079 server->namelen = NFS3_MAXNAMLEN; 1080 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1081 server->caps |= NFS_CAP_READDIRPLUS; 1082 } else { 1083 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1084 server->namelen = NFS2_MAXNAMLEN; 1085 } 1086 1087 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1088 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 1089 if (error < 0) { 1090 dprintk("nfs_create_server: getattr error = %d\n", -error); 1091 goto error; 1092 } 1093 } 1094 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1095 1096 dprintk("Server FSID: %llx:%llx\n", 1097 (unsigned long long) server->fsid.major, 1098 (unsigned long long) server->fsid.minor); 1099 1100 nfs_server_insert_lists(server); 1101 server->mount_time = jiffies; 1102 nfs_free_fattr(fattr); 1103 return server; 1104 1105 error: 1106 nfs_free_fattr(fattr); 1107 nfs_free_server(server); 1108 return ERR_PTR(error); 1109 } 1110 EXPORT_SYMBOL_GPL(nfs_create_server); 1111 1112 /* 1113 * Clone an NFS2, NFS3 or NFS4 server record 1114 */ 1115 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1116 struct nfs_fh *fh, 1117 struct nfs_fattr *fattr, 1118 rpc_authflavor_t flavor) 1119 { 1120 struct nfs_server *server; 1121 struct nfs_fattr *fattr_fsinfo; 1122 int error; 1123 1124 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1125 (unsigned long long) fattr->fsid.major, 1126 (unsigned long long) fattr->fsid.minor); 1127 1128 server = nfs_alloc_server(); 1129 if (!server) 1130 return ERR_PTR(-ENOMEM); 1131 1132 error = -ENOMEM; 1133 fattr_fsinfo = nfs_alloc_fattr(); 1134 if (fattr_fsinfo == NULL) 1135 goto out_free_server; 1136 1137 /* Copy data from the source */ 1138 server->nfs_client = source->nfs_client; 1139 server->destroy = source->destroy; 1140 atomic_inc(&server->nfs_client->cl_count); 1141 nfs_server_copy_userdata(server, source); 1142 1143 server->fsid = fattr->fsid; 1144 1145 error = nfs_init_server_rpcclient(server, 1146 source->client->cl_timeout, 1147 flavor); 1148 if (error < 0) 1149 goto out_free_server; 1150 1151 /* probe the filesystem info for this server filesystem */ 1152 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1153 if (error < 0) 1154 goto out_free_server; 1155 1156 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1157 server->namelen = NFS4_MAXNAMLEN; 1158 1159 dprintk("Cloned FSID: %llx:%llx\n", 1160 (unsigned long long) server->fsid.major, 1161 (unsigned long long) server->fsid.minor); 1162 1163 error = nfs_start_lockd(server); 1164 if (error < 0) 1165 goto out_free_server; 1166 1167 nfs_server_insert_lists(server); 1168 server->mount_time = jiffies; 1169 1170 nfs_free_fattr(fattr_fsinfo); 1171 dprintk("<-- nfs_clone_server() = %p\n", server); 1172 return server; 1173 1174 out_free_server: 1175 nfs_free_fattr(fattr_fsinfo); 1176 nfs_free_server(server); 1177 dprintk("<-- nfs_clone_server() = error %d\n", error); 1178 return ERR_PTR(error); 1179 } 1180 EXPORT_SYMBOL_GPL(nfs_clone_server); 1181 1182 void nfs_clients_init(struct net *net) 1183 { 1184 struct nfs_net *nn = net_generic(net, nfs_net_id); 1185 1186 INIT_LIST_HEAD(&nn->nfs_client_list); 1187 INIT_LIST_HEAD(&nn->nfs_volume_list); 1188 #if IS_ENABLED(CONFIG_NFS_V4) 1189 idr_init(&nn->cb_ident_idr); 1190 #endif 1191 spin_lock_init(&nn->nfs_client_lock); 1192 nn->boot_time = CURRENT_TIME; 1193 } 1194 1195 #ifdef CONFIG_PROC_FS 1196 static struct proc_dir_entry *proc_fs_nfs; 1197 1198 static int nfs_server_list_open(struct inode *inode, struct file *file); 1199 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1200 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1201 static void nfs_server_list_stop(struct seq_file *p, void *v); 1202 static int nfs_server_list_show(struct seq_file *m, void *v); 1203 1204 static const struct seq_operations nfs_server_list_ops = { 1205 .start = nfs_server_list_start, 1206 .next = nfs_server_list_next, 1207 .stop = nfs_server_list_stop, 1208 .show = nfs_server_list_show, 1209 }; 1210 1211 static const struct file_operations nfs_server_list_fops = { 1212 .open = nfs_server_list_open, 1213 .read = seq_read, 1214 .llseek = seq_lseek, 1215 .release = seq_release_net, 1216 .owner = THIS_MODULE, 1217 }; 1218 1219 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1220 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1221 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1222 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1223 static int nfs_volume_list_show(struct seq_file *m, void *v); 1224 1225 static const struct seq_operations nfs_volume_list_ops = { 1226 .start = nfs_volume_list_start, 1227 .next = nfs_volume_list_next, 1228 .stop = nfs_volume_list_stop, 1229 .show = nfs_volume_list_show, 1230 }; 1231 1232 static const struct file_operations nfs_volume_list_fops = { 1233 .open = nfs_volume_list_open, 1234 .read = seq_read, 1235 .llseek = seq_lseek, 1236 .release = seq_release_net, 1237 .owner = THIS_MODULE, 1238 }; 1239 1240 /* 1241 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1242 * we're dealing 1243 */ 1244 static int nfs_server_list_open(struct inode *inode, struct file *file) 1245 { 1246 return seq_open_net(inode, file, &nfs_server_list_ops, 1247 sizeof(struct seq_net_private)); 1248 } 1249 1250 /* 1251 * set up the iterator to start reading from the server list and return the first item 1252 */ 1253 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1254 __acquires(&nn->nfs_client_lock) 1255 { 1256 struct nfs_net *nn = net_generic(seq_file_net(m), 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(seq_file_net(p), 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 __releases(&nn->nfs_client_lock) 1278 { 1279 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1280 1281 spin_unlock(&nn->nfs_client_lock); 1282 } 1283 1284 /* 1285 * display a header line followed by a load of call lines 1286 */ 1287 static int nfs_server_list_show(struct seq_file *m, void *v) 1288 { 1289 struct nfs_client *clp; 1290 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1291 1292 /* display header on line 1 */ 1293 if (v == &nn->nfs_client_list) { 1294 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1295 return 0; 1296 } 1297 1298 /* display one transport per line on subsequent lines */ 1299 clp = list_entry(v, struct nfs_client, cl_share_link); 1300 1301 /* Check if the client is initialized */ 1302 if (clp->cl_cons_state != NFS_CS_READY) 1303 return 0; 1304 1305 rcu_read_lock(); 1306 seq_printf(m, "v%u %s %s %3d %s\n", 1307 clp->rpc_ops->version, 1308 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1309 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1310 atomic_read(&clp->cl_count), 1311 clp->cl_hostname); 1312 rcu_read_unlock(); 1313 1314 return 0; 1315 } 1316 1317 /* 1318 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1319 */ 1320 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1321 { 1322 return seq_open_net(inode, file, &nfs_volume_list_ops, 1323 sizeof(struct seq_net_private)); 1324 } 1325 1326 /* 1327 * set up the iterator to start reading from the volume list and return the first item 1328 */ 1329 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1330 __acquires(&nn->nfs_client_lock) 1331 { 1332 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1333 1334 /* lock the list against modification */ 1335 spin_lock(&nn->nfs_client_lock); 1336 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1337 } 1338 1339 /* 1340 * move to next volume 1341 */ 1342 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1343 { 1344 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1345 1346 return seq_list_next(v, &nn->nfs_volume_list, pos); 1347 } 1348 1349 /* 1350 * clean up after reading from the transports list 1351 */ 1352 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1353 __releases(&nn->nfs_client_lock) 1354 { 1355 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1356 1357 spin_unlock(&nn->nfs_client_lock); 1358 } 1359 1360 /* 1361 * display a header line followed by a load of call lines 1362 */ 1363 static int nfs_volume_list_show(struct seq_file *m, void *v) 1364 { 1365 struct nfs_server *server; 1366 struct nfs_client *clp; 1367 char dev[8], fsid[17]; 1368 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1369 1370 /* display header on line 1 */ 1371 if (v == &nn->nfs_volume_list) { 1372 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1373 return 0; 1374 } 1375 /* display one transport per line on subsequent lines */ 1376 server = list_entry(v, struct nfs_server, master_link); 1377 clp = server->nfs_client; 1378 1379 snprintf(dev, 8, "%u:%u", 1380 MAJOR(server->s_dev), MINOR(server->s_dev)); 1381 1382 snprintf(fsid, 17, "%llx:%llx", 1383 (unsigned long long) server->fsid.major, 1384 (unsigned long long) server->fsid.minor); 1385 1386 rcu_read_lock(); 1387 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1388 clp->rpc_ops->version, 1389 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1390 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1391 dev, 1392 fsid, 1393 nfs_server_fscache_state(server)); 1394 rcu_read_unlock(); 1395 1396 return 0; 1397 } 1398 1399 int nfs_fs_proc_net_init(struct net *net) 1400 { 1401 struct nfs_net *nn = net_generic(net, nfs_net_id); 1402 struct proc_dir_entry *p; 1403 1404 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1405 if (!nn->proc_nfsfs) 1406 goto error_0; 1407 1408 /* a file of servers with which we're dealing */ 1409 p = proc_create("servers", S_IFREG|S_IRUGO, 1410 nn->proc_nfsfs, &nfs_server_list_fops); 1411 if (!p) 1412 goto error_1; 1413 1414 /* a file of volumes that we have mounted */ 1415 p = proc_create("volumes", S_IFREG|S_IRUGO, 1416 nn->proc_nfsfs, &nfs_volume_list_fops); 1417 if (!p) 1418 goto error_1; 1419 return 0; 1420 1421 error_1: 1422 remove_proc_subtree("nfsfs", net->proc_net); 1423 error_0: 1424 return -ENOMEM; 1425 } 1426 1427 void nfs_fs_proc_net_exit(struct net *net) 1428 { 1429 remove_proc_subtree("nfsfs", net->proc_net); 1430 } 1431 1432 /* 1433 * initialise the /proc/fs/nfsfs/ directory 1434 */ 1435 int __init nfs_fs_proc_init(void) 1436 { 1437 struct proc_dir_entry *p; 1438 1439 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1440 if (!proc_fs_nfs) 1441 goto error_0; 1442 1443 /* a file of servers with which we're dealing */ 1444 p = proc_symlink("servers", proc_fs_nfs, "../../net/nfsfs/servers"); 1445 if (!p) 1446 goto error_1; 1447 1448 /* a file of volumes that we have mounted */ 1449 p = proc_symlink("volumes", proc_fs_nfs, "../../net/nfsfs/volumes"); 1450 if (!p) 1451 goto error_2; 1452 return 0; 1453 1454 error_2: 1455 remove_proc_entry("servers", proc_fs_nfs); 1456 error_1: 1457 remove_proc_entry("fs/nfsfs", NULL); 1458 error_0: 1459 return -ENOMEM; 1460 } 1461 1462 /* 1463 * clean up the /proc/fs/nfsfs/ directory 1464 */ 1465 void nfs_fs_proc_exit(void) 1466 { 1467 remove_proc_entry("volumes", proc_fs_nfs); 1468 remove_proc_entry("servers", proc_fs_nfs); 1469 remove_proc_entry("fs/nfsfs", NULL); 1470 } 1471 1472 #endif /* CONFIG_PROC_FS */ 1473