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) && !try_module_get(nfs->owner)) 114 return ERR_PTR(-EAGAIN); 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 if (!try_module_get(clp->cl_nfs_mod->owner)) 162 goto error_dealloc; 163 164 clp->rpc_ops = clp->cl_nfs_mod->rpc_ops; 165 166 atomic_set(&clp->cl_count, 1); 167 clp->cl_cons_state = NFS_CS_INITING; 168 169 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 170 clp->cl_addrlen = cl_init->addrlen; 171 172 if (cl_init->hostname) { 173 err = -ENOMEM; 174 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 175 if (!clp->cl_hostname) 176 goto error_cleanup; 177 } 178 179 INIT_LIST_HEAD(&clp->cl_superblocks); 180 clp->cl_rpcclient = ERR_PTR(-EINVAL); 181 182 clp->cl_proto = cl_init->proto; 183 clp->cl_net = get_net(cl_init->net); 184 185 cred = rpc_lookup_machine_cred("*"); 186 if (!IS_ERR(cred)) 187 clp->cl_machine_cred = cred; 188 nfs_fscache_get_client_cookie(clp); 189 190 return clp; 191 192 error_cleanup: 193 put_nfs_version(clp->cl_nfs_mod); 194 error_dealloc: 195 kfree(clp); 196 error_0: 197 return ERR_PTR(err); 198 } 199 EXPORT_SYMBOL_GPL(nfs_alloc_client); 200 201 #if IS_ENABLED(CONFIG_NFS_V4) 202 void nfs_cleanup_cb_ident_idr(struct net *net) 203 { 204 struct nfs_net *nn = net_generic(net, nfs_net_id); 205 206 idr_destroy(&nn->cb_ident_idr); 207 } 208 209 /* nfs_client_lock held */ 210 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 211 { 212 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 213 214 if (clp->cl_cb_ident) 215 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 216 } 217 218 static void pnfs_init_server(struct nfs_server *server) 219 { 220 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 221 } 222 223 #else 224 void nfs_cleanup_cb_ident_idr(struct net *net) 225 { 226 } 227 228 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 229 { 230 } 231 232 static void pnfs_init_server(struct nfs_server *server) 233 { 234 } 235 236 #endif /* CONFIG_NFS_V4 */ 237 238 /* 239 * Destroy a shared client record 240 */ 241 void nfs_free_client(struct nfs_client *clp) 242 { 243 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 244 245 nfs_fscache_release_client_cookie(clp); 246 247 /* -EIO all pending I/O */ 248 if (!IS_ERR(clp->cl_rpcclient)) 249 rpc_shutdown_client(clp->cl_rpcclient); 250 251 if (clp->cl_machine_cred != NULL) 252 put_rpccred(clp->cl_machine_cred); 253 254 put_net(clp->cl_net); 255 put_nfs_version(clp->cl_nfs_mod); 256 kfree(clp->cl_hostname); 257 kfree(clp->cl_acceptor); 258 kfree(clp); 259 260 dprintk("<-- nfs_free_client()\n"); 261 } 262 EXPORT_SYMBOL_GPL(nfs_free_client); 263 264 /* 265 * Release a reference to a shared client record 266 */ 267 void nfs_put_client(struct nfs_client *clp) 268 { 269 struct nfs_net *nn; 270 271 if (!clp) 272 return; 273 274 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 275 nn = net_generic(clp->cl_net, nfs_net_id); 276 277 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 278 list_del(&clp->cl_share_link); 279 nfs_cb_idr_remove_locked(clp); 280 spin_unlock(&nn->nfs_client_lock); 281 282 WARN_ON_ONCE(!list_empty(&clp->cl_superblocks)); 283 284 clp->rpc_ops->free_client(clp); 285 } 286 } 287 EXPORT_SYMBOL_GPL(nfs_put_client); 288 289 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 290 /* 291 * Test if two ip6 socket addresses refer to the same socket by 292 * comparing relevant fields. The padding bytes specifically, are not 293 * compared. sin6_flowinfo is not compared because it only affects QoS 294 * and sin6_scope_id is only compared if the address is "link local" 295 * because "link local" addresses need only be unique to a specific 296 * link. Conversely, ordinary unicast addresses might have different 297 * sin6_scope_id. 298 * 299 * The caller should ensure both socket addresses are AF_INET6. 300 */ 301 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 302 const struct sockaddr *sa2) 303 { 304 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 305 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 306 307 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 308 return 0; 309 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 310 return sin1->sin6_scope_id == sin2->sin6_scope_id; 311 312 return 1; 313 } 314 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 315 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 316 const struct sockaddr *sa2) 317 { 318 return 0; 319 } 320 #endif 321 322 /* 323 * Test if two ip4 socket addresses refer to the same socket, by 324 * comparing relevant fields. The padding bytes specifically, are 325 * not compared. 326 * 327 * The caller should ensure both socket addresses are AF_INET. 328 */ 329 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 330 const struct sockaddr *sa2) 331 { 332 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 333 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 334 335 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 336 } 337 338 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 339 const struct sockaddr *sa2) 340 { 341 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 342 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 343 344 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 345 (sin1->sin6_port == sin2->sin6_port); 346 } 347 348 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 349 const struct sockaddr *sa2) 350 { 351 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 352 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 353 354 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 355 (sin1->sin_port == sin2->sin_port); 356 } 357 358 #if defined(CONFIG_NFS_V4_1) 359 /* 360 * Test if two socket addresses represent the same actual socket, 361 * by comparing (only) relevant fields, excluding the port number. 362 */ 363 int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 364 const struct sockaddr *sa2) 365 { 366 if (sa1->sa_family != sa2->sa_family) 367 return 0; 368 369 switch (sa1->sa_family) { 370 case AF_INET: 371 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 372 case AF_INET6: 373 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 374 } 375 return 0; 376 } 377 EXPORT_SYMBOL_GPL(nfs_sockaddr_match_ipaddr); 378 #endif /* CONFIG_NFS_V4_1 */ 379 380 /* 381 * Test if two socket addresses represent the same actual socket, 382 * by comparing (only) relevant fields, including the port number. 383 */ 384 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 385 const struct sockaddr *sa2) 386 { 387 if (sa1->sa_family != sa2->sa_family) 388 return 0; 389 390 switch (sa1->sa_family) { 391 case AF_INET: 392 return nfs_sockaddr_cmp_ip4(sa1, sa2); 393 case AF_INET6: 394 return nfs_sockaddr_cmp_ip6(sa1, sa2); 395 } 396 return 0; 397 } 398 399 /* 400 * Find an nfs_client on the list that matches the initialisation data 401 * that is supplied. 402 */ 403 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 404 { 405 struct nfs_client *clp; 406 const struct sockaddr *sap = data->addr; 407 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 408 409 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 410 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 411 /* Don't match clients that failed to initialise properly */ 412 if (clp->cl_cons_state < 0) 413 continue; 414 415 /* Different NFS versions cannot share the same nfs_client */ 416 if (clp->rpc_ops != data->nfs_mod->rpc_ops) 417 continue; 418 419 if (clp->cl_proto != data->proto) 420 continue; 421 /* Match nfsv4 minorversion */ 422 if (clp->cl_minorversion != data->minorversion) 423 continue; 424 /* Match the full socket address */ 425 if (!nfs_sockaddr_cmp(sap, clap)) 426 continue; 427 428 atomic_inc(&clp->cl_count); 429 return clp; 430 } 431 return NULL; 432 } 433 434 static bool nfs_client_init_is_complete(const struct nfs_client *clp) 435 { 436 return clp->cl_cons_state <= NFS_CS_READY; 437 } 438 439 int nfs_wait_client_init_complete(const struct nfs_client *clp) 440 { 441 return wait_event_killable(nfs_client_active_wq, 442 nfs_client_init_is_complete(clp)); 443 } 444 EXPORT_SYMBOL_GPL(nfs_wait_client_init_complete); 445 446 /* 447 * Found an existing client. Make sure it's ready before returning. 448 */ 449 static struct nfs_client * 450 nfs_found_client(const struct nfs_client_initdata *cl_init, 451 struct nfs_client *clp) 452 { 453 int error; 454 455 error = nfs_wait_client_init_complete(clp); 456 if (error < 0) { 457 nfs_put_client(clp); 458 return ERR_PTR(-ERESTARTSYS); 459 } 460 461 if (clp->cl_cons_state < NFS_CS_READY) { 462 error = clp->cl_cons_state; 463 nfs_put_client(clp); 464 return ERR_PTR(error); 465 } 466 467 smp_rmb(); 468 469 dprintk("<-- %s found nfs_client %p for %s\n", 470 __func__, clp, cl_init->hostname ?: ""); 471 return clp; 472 } 473 474 /* 475 * Look up a client by IP address and protocol version 476 * - creates a new record if one doesn't yet exist 477 */ 478 struct nfs_client * 479 nfs_get_client(const struct nfs_client_initdata *cl_init, 480 const struct rpc_timeout *timeparms, 481 const char *ip_addr, 482 rpc_authflavor_t authflavour) 483 { 484 struct nfs_client *clp, *new = NULL; 485 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 486 const struct nfs_rpc_ops *rpc_ops = cl_init->nfs_mod->rpc_ops; 487 488 if (cl_init->hostname == NULL) { 489 WARN_ON(1); 490 return NULL; 491 } 492 493 dprintk("--> nfs_get_client(%s,v%u)\n", 494 cl_init->hostname, rpc_ops->version); 495 496 /* see if the client already exists */ 497 do { 498 spin_lock(&nn->nfs_client_lock); 499 500 clp = nfs_match_client(cl_init); 501 if (clp) { 502 spin_unlock(&nn->nfs_client_lock); 503 if (new) 504 new->rpc_ops->free_client(new); 505 return nfs_found_client(cl_init, clp); 506 } 507 if (new) { 508 list_add_tail(&new->cl_share_link, 509 &nn->nfs_client_list); 510 spin_unlock(&nn->nfs_client_lock); 511 new->cl_flags = cl_init->init_flags; 512 return rpc_ops->init_client(new, timeparms, ip_addr); 513 } 514 515 spin_unlock(&nn->nfs_client_lock); 516 517 new = rpc_ops->alloc_client(cl_init); 518 } while (!IS_ERR(new)); 519 520 dprintk("<-- nfs_get_client() Failed to find %s (%ld)\n", 521 cl_init->hostname, PTR_ERR(new)); 522 return new; 523 } 524 EXPORT_SYMBOL_GPL(nfs_get_client); 525 526 /* 527 * Mark a server as ready or failed 528 */ 529 void nfs_mark_client_ready(struct nfs_client *clp, int state) 530 { 531 smp_wmb(); 532 clp->cl_cons_state = state; 533 wake_up_all(&nfs_client_active_wq); 534 } 535 EXPORT_SYMBOL_GPL(nfs_mark_client_ready); 536 537 /* 538 * Initialise the timeout values for a connection 539 */ 540 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 541 unsigned int timeo, unsigned int retrans) 542 { 543 to->to_initval = timeo * HZ / 10; 544 to->to_retries = retrans; 545 546 switch (proto) { 547 case XPRT_TRANSPORT_TCP: 548 case XPRT_TRANSPORT_RDMA: 549 if (to->to_retries == 0) 550 to->to_retries = NFS_DEF_TCP_RETRANS; 551 if (to->to_initval == 0) 552 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 553 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 554 to->to_initval = NFS_MAX_TCP_TIMEOUT; 555 to->to_increment = to->to_initval; 556 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 557 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 558 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 559 if (to->to_maxval < to->to_initval) 560 to->to_maxval = to->to_initval; 561 to->to_exponential = 0; 562 break; 563 case XPRT_TRANSPORT_UDP: 564 if (to->to_retries == 0) 565 to->to_retries = NFS_DEF_UDP_RETRANS; 566 if (!to->to_initval) 567 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 568 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 569 to->to_initval = NFS_MAX_UDP_TIMEOUT; 570 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 571 to->to_exponential = 1; 572 break; 573 default: 574 BUG(); 575 } 576 } 577 EXPORT_SYMBOL_GPL(nfs_init_timeout_values); 578 579 /* 580 * Create an RPC client handle 581 */ 582 int nfs_create_rpc_client(struct nfs_client *clp, 583 const struct rpc_timeout *timeparms, 584 rpc_authflavor_t flavor) 585 { 586 struct rpc_clnt *clnt = NULL; 587 struct rpc_create_args args = { 588 .net = clp->cl_net, 589 .protocol = clp->cl_proto, 590 .address = (struct sockaddr *)&clp->cl_addr, 591 .addrsize = clp->cl_addrlen, 592 .timeout = timeparms, 593 .servername = clp->cl_hostname, 594 .program = &nfs_program, 595 .version = clp->rpc_ops->version, 596 .authflavor = flavor, 597 }; 598 599 if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags)) 600 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 601 if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags)) 602 args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT; 603 if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags)) 604 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 605 if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags)) 606 args.flags |= RPC_CLNT_CREATE_INFINITE_SLOTS; 607 608 if (!IS_ERR(clp->cl_rpcclient)) 609 return 0; 610 611 clnt = rpc_create(&args); 612 if (IS_ERR(clnt)) { 613 dprintk("%s: cannot create RPC client. Error = %ld\n", 614 __func__, PTR_ERR(clnt)); 615 return PTR_ERR(clnt); 616 } 617 618 clp->cl_rpcclient = clnt; 619 return 0; 620 } 621 EXPORT_SYMBOL_GPL(nfs_create_rpc_client); 622 623 /* 624 * Version 2 or 3 client destruction 625 */ 626 static void nfs_destroy_server(struct nfs_server *server) 627 { 628 if (server->nlm_host) 629 nlmclnt_done(server->nlm_host); 630 } 631 632 /* 633 * Version 2 or 3 lockd setup 634 */ 635 static int nfs_start_lockd(struct nfs_server *server) 636 { 637 struct nlm_host *host; 638 struct nfs_client *clp = server->nfs_client; 639 struct nlmclnt_initdata nlm_init = { 640 .hostname = clp->cl_hostname, 641 .address = (struct sockaddr *)&clp->cl_addr, 642 .addrlen = clp->cl_addrlen, 643 .nfs_version = clp->rpc_ops->version, 644 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 645 1 : 0, 646 .net = clp->cl_net, 647 }; 648 649 if (nlm_init.nfs_version > 3) 650 return 0; 651 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 652 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 653 return 0; 654 655 switch (clp->cl_proto) { 656 default: 657 nlm_init.protocol = IPPROTO_TCP; 658 break; 659 case XPRT_TRANSPORT_UDP: 660 nlm_init.protocol = IPPROTO_UDP; 661 } 662 663 host = nlmclnt_init(&nlm_init); 664 if (IS_ERR(host)) 665 return PTR_ERR(host); 666 667 server->nlm_host = host; 668 server->destroy = nfs_destroy_server; 669 return 0; 670 } 671 672 /* 673 * Create a general RPC client 674 */ 675 int nfs_init_server_rpcclient(struct nfs_server *server, 676 const struct rpc_timeout *timeo, 677 rpc_authflavor_t pseudoflavour) 678 { 679 struct nfs_client *clp = server->nfs_client; 680 681 server->client = rpc_clone_client_set_auth(clp->cl_rpcclient, 682 pseudoflavour); 683 if (IS_ERR(server->client)) { 684 dprintk("%s: couldn't create rpc_client!\n", __func__); 685 return PTR_ERR(server->client); 686 } 687 688 memcpy(&server->client->cl_timeout_default, 689 timeo, 690 sizeof(server->client->cl_timeout_default)); 691 server->client->cl_timeout = &server->client->cl_timeout_default; 692 server->client->cl_softrtry = 0; 693 if (server->flags & NFS_MOUNT_SOFT) 694 server->client->cl_softrtry = 1; 695 696 return 0; 697 } 698 EXPORT_SYMBOL_GPL(nfs_init_server_rpcclient); 699 700 /** 701 * nfs_init_client - Initialise an NFS2 or NFS3 client 702 * 703 * @clp: nfs_client to initialise 704 * @timeparms: timeout parameters for underlying RPC transport 705 * @ip_addr: IP presentation address (not used) 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) 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 server->auth_info = data->auth_info; 798 799 error = nfs_init_server_rpcclient(server, &timeparms, 800 data->selected_flavor); 801 if (error < 0) 802 goto error; 803 804 /* Preserve the values of mount_server-related mount options */ 805 if (data->mount_server.addrlen) { 806 memcpy(&server->mountd_address, &data->mount_server.address, 807 data->mount_server.addrlen); 808 server->mountd_addrlen = data->mount_server.addrlen; 809 } 810 server->mountd_version = data->mount_server.version; 811 server->mountd_port = data->mount_server.port; 812 server->mountd_protocol = data->mount_server.protocol; 813 814 server->namelen = data->namlen; 815 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 816 return 0; 817 818 error: 819 server->nfs_client = NULL; 820 nfs_put_client(clp); 821 dprintk("<-- nfs_init_server() = xerror %d\n", error); 822 return error; 823 } 824 825 /* 826 * Load up the server record from information gained in an fsinfo record 827 */ 828 static void nfs_server_set_fsinfo(struct nfs_server *server, 829 struct nfs_fh *mntfh, 830 struct nfs_fsinfo *fsinfo) 831 { 832 unsigned long max_rpc_payload; 833 834 /* Work out a lot of parameters */ 835 if (server->rsize == 0) 836 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 837 if (server->wsize == 0) 838 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 839 840 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 841 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 842 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 843 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 844 845 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 846 if (server->rsize > max_rpc_payload) 847 server->rsize = max_rpc_payload; 848 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 849 server->rsize = NFS_MAX_FILE_IO_SIZE; 850 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 851 852 server->backing_dev_info.name = "nfs"; 853 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 854 855 if (server->wsize > max_rpc_payload) 856 server->wsize = max_rpc_payload; 857 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 858 server->wsize = NFS_MAX_FILE_IO_SIZE; 859 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 860 861 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 862 863 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 864 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 865 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 866 if (server->dtsize > server->rsize) 867 server->dtsize = server->rsize; 868 869 if (server->flags & NFS_MOUNT_NOAC) { 870 server->acregmin = server->acregmax = 0; 871 server->acdirmin = server->acdirmax = 0; 872 } 873 874 server->maxfilesize = fsinfo->maxfilesize; 875 876 server->time_delta = fsinfo->time_delta; 877 878 /* We're airborne Set socket buffersize */ 879 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 880 } 881 882 /* 883 * Probe filesystem information, including the FSID on v2/v3 884 */ 885 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 886 { 887 struct nfs_fsinfo fsinfo; 888 struct nfs_client *clp = server->nfs_client; 889 int error; 890 891 dprintk("--> nfs_probe_fsinfo()\n"); 892 893 if (clp->rpc_ops->set_capabilities != NULL) { 894 error = clp->rpc_ops->set_capabilities(server, mntfh); 895 if (error < 0) 896 goto out_error; 897 } 898 899 fsinfo.fattr = fattr; 900 fsinfo.layouttype = 0; 901 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 902 if (error < 0) 903 goto out_error; 904 905 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 906 907 /* Get some general file system info */ 908 if (server->namelen == 0) { 909 struct nfs_pathconf pathinfo; 910 911 pathinfo.fattr = fattr; 912 nfs_fattr_init(fattr); 913 914 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 915 server->namelen = pathinfo.max_namelen; 916 } 917 918 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 919 return 0; 920 921 out_error: 922 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 923 return error; 924 } 925 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 926 927 /* 928 * Copy useful information when duplicating a server record 929 */ 930 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 931 { 932 target->flags = source->flags; 933 target->rsize = source->rsize; 934 target->wsize = source->wsize; 935 target->acregmin = source->acregmin; 936 target->acregmax = source->acregmax; 937 target->acdirmin = source->acdirmin; 938 target->acdirmax = source->acdirmax; 939 target->caps = source->caps; 940 target->options = source->options; 941 target->auth_info = source->auth_info; 942 } 943 EXPORT_SYMBOL_GPL(nfs_server_copy_userdata); 944 945 void nfs_server_insert_lists(struct nfs_server *server) 946 { 947 struct nfs_client *clp = server->nfs_client; 948 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 949 950 spin_lock(&nn->nfs_client_lock); 951 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 952 list_add_tail(&server->master_link, &nn->nfs_volume_list); 953 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 954 spin_unlock(&nn->nfs_client_lock); 955 956 } 957 EXPORT_SYMBOL_GPL(nfs_server_insert_lists); 958 959 void nfs_server_remove_lists(struct nfs_server *server) 960 { 961 struct nfs_client *clp = server->nfs_client; 962 struct nfs_net *nn; 963 964 if (clp == NULL) 965 return; 966 nn = net_generic(clp->cl_net, nfs_net_id); 967 spin_lock(&nn->nfs_client_lock); 968 list_del_rcu(&server->client_link); 969 if (list_empty(&clp->cl_superblocks)) 970 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 971 list_del(&server->master_link); 972 spin_unlock(&nn->nfs_client_lock); 973 974 synchronize_rcu(); 975 } 976 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 977 978 /* 979 * Allocate and initialise a server record 980 */ 981 struct nfs_server *nfs_alloc_server(void) 982 { 983 struct nfs_server *server; 984 985 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 986 if (!server) 987 return NULL; 988 989 server->client = server->client_acl = ERR_PTR(-EINVAL); 990 991 /* Zero out the NFS state stuff */ 992 INIT_LIST_HEAD(&server->client_link); 993 INIT_LIST_HEAD(&server->master_link); 994 INIT_LIST_HEAD(&server->delegations); 995 INIT_LIST_HEAD(&server->layouts); 996 INIT_LIST_HEAD(&server->state_owners_lru); 997 998 atomic_set(&server->active, 0); 999 1000 server->io_stats = nfs_alloc_iostats(); 1001 if (!server->io_stats) { 1002 kfree(server); 1003 return NULL; 1004 } 1005 1006 if (bdi_init(&server->backing_dev_info)) { 1007 nfs_free_iostats(server->io_stats); 1008 kfree(server); 1009 return NULL; 1010 } 1011 1012 ida_init(&server->openowner_id); 1013 ida_init(&server->lockowner_id); 1014 pnfs_init_server(server); 1015 1016 return server; 1017 } 1018 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1019 1020 /* 1021 * Free up a server record 1022 */ 1023 void nfs_free_server(struct nfs_server *server) 1024 { 1025 dprintk("--> nfs_free_server()\n"); 1026 1027 nfs_server_remove_lists(server); 1028 1029 if (server->destroy != NULL) 1030 server->destroy(server); 1031 1032 if (!IS_ERR(server->client_acl)) 1033 rpc_shutdown_client(server->client_acl); 1034 if (!IS_ERR(server->client)) 1035 rpc_shutdown_client(server->client); 1036 1037 nfs_put_client(server->nfs_client); 1038 1039 ida_destroy(&server->lockowner_id); 1040 ida_destroy(&server->openowner_id); 1041 nfs_free_iostats(server->io_stats); 1042 bdi_destroy(&server->backing_dev_info); 1043 kfree(server); 1044 nfs_release_automount_timer(); 1045 dprintk("<-- nfs_free_server()\n"); 1046 } 1047 EXPORT_SYMBOL_GPL(nfs_free_server); 1048 1049 /* 1050 * Create a version 2 or 3 volume record 1051 * - keyed on server and FSID 1052 */ 1053 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1054 struct nfs_subversion *nfs_mod) 1055 { 1056 struct nfs_server *server; 1057 struct nfs_fattr *fattr; 1058 int error; 1059 1060 server = nfs_alloc_server(); 1061 if (!server) 1062 return ERR_PTR(-ENOMEM); 1063 1064 error = -ENOMEM; 1065 fattr = nfs_alloc_fattr(); 1066 if (fattr == NULL) 1067 goto error; 1068 1069 /* Get a client representation */ 1070 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1071 if (error < 0) 1072 goto error; 1073 1074 /* Probe the root fh to retrieve its FSID */ 1075 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1076 if (error < 0) 1077 goto error; 1078 if (server->nfs_client->rpc_ops->version == 3) { 1079 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1080 server->namelen = NFS3_MAXNAMLEN; 1081 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1082 server->caps |= NFS_CAP_READDIRPLUS; 1083 } else { 1084 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1085 server->namelen = NFS2_MAXNAMLEN; 1086 } 1087 1088 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1089 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 1090 if (error < 0) { 1091 dprintk("nfs_create_server: getattr error = %d\n", -error); 1092 goto error; 1093 } 1094 } 1095 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1096 1097 dprintk("Server FSID: %llx:%llx\n", 1098 (unsigned long long) server->fsid.major, 1099 (unsigned long long) server->fsid.minor); 1100 1101 nfs_server_insert_lists(server); 1102 server->mount_time = jiffies; 1103 nfs_free_fattr(fattr); 1104 return server; 1105 1106 error: 1107 nfs_free_fattr(fattr); 1108 nfs_free_server(server); 1109 return ERR_PTR(error); 1110 } 1111 EXPORT_SYMBOL_GPL(nfs_create_server); 1112 1113 /* 1114 * Clone an NFS2, NFS3 or NFS4 server record 1115 */ 1116 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1117 struct nfs_fh *fh, 1118 struct nfs_fattr *fattr, 1119 rpc_authflavor_t flavor) 1120 { 1121 struct nfs_server *server; 1122 struct nfs_fattr *fattr_fsinfo; 1123 int error; 1124 1125 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1126 (unsigned long long) fattr->fsid.major, 1127 (unsigned long long) fattr->fsid.minor); 1128 1129 server = nfs_alloc_server(); 1130 if (!server) 1131 return ERR_PTR(-ENOMEM); 1132 1133 error = -ENOMEM; 1134 fattr_fsinfo = nfs_alloc_fattr(); 1135 if (fattr_fsinfo == NULL) 1136 goto out_free_server; 1137 1138 /* Copy data from the source */ 1139 server->nfs_client = source->nfs_client; 1140 server->destroy = source->destroy; 1141 atomic_inc(&server->nfs_client->cl_count); 1142 nfs_server_copy_userdata(server, source); 1143 1144 server->fsid = fattr->fsid; 1145 1146 error = nfs_init_server_rpcclient(server, 1147 source->client->cl_timeout, 1148 flavor); 1149 if (error < 0) 1150 goto out_free_server; 1151 1152 /* probe the filesystem info for this server filesystem */ 1153 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1154 if (error < 0) 1155 goto out_free_server; 1156 1157 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1158 server->namelen = NFS4_MAXNAMLEN; 1159 1160 dprintk("Cloned FSID: %llx:%llx\n", 1161 (unsigned long long) server->fsid.major, 1162 (unsigned long long) server->fsid.minor); 1163 1164 error = nfs_start_lockd(server); 1165 if (error < 0) 1166 goto out_free_server; 1167 1168 nfs_server_insert_lists(server); 1169 server->mount_time = jiffies; 1170 1171 nfs_free_fattr(fattr_fsinfo); 1172 dprintk("<-- nfs_clone_server() = %p\n", server); 1173 return server; 1174 1175 out_free_server: 1176 nfs_free_fattr(fattr_fsinfo); 1177 nfs_free_server(server); 1178 dprintk("<-- nfs_clone_server() = error %d\n", error); 1179 return ERR_PTR(error); 1180 } 1181 EXPORT_SYMBOL_GPL(nfs_clone_server); 1182 1183 void nfs_clients_init(struct net *net) 1184 { 1185 struct nfs_net *nn = net_generic(net, nfs_net_id); 1186 1187 INIT_LIST_HEAD(&nn->nfs_client_list); 1188 INIT_LIST_HEAD(&nn->nfs_volume_list); 1189 #if IS_ENABLED(CONFIG_NFS_V4) 1190 idr_init(&nn->cb_ident_idr); 1191 #endif 1192 spin_lock_init(&nn->nfs_client_lock); 1193 nn->boot_time = CURRENT_TIME; 1194 } 1195 1196 #ifdef CONFIG_PROC_FS 1197 static struct proc_dir_entry *proc_fs_nfs; 1198 1199 static int nfs_server_list_open(struct inode *inode, struct file *file); 1200 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1201 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1202 static void nfs_server_list_stop(struct seq_file *p, void *v); 1203 static int nfs_server_list_show(struct seq_file *m, void *v); 1204 1205 static const struct seq_operations nfs_server_list_ops = { 1206 .start = nfs_server_list_start, 1207 .next = nfs_server_list_next, 1208 .stop = nfs_server_list_stop, 1209 .show = nfs_server_list_show, 1210 }; 1211 1212 static const struct file_operations nfs_server_list_fops = { 1213 .open = nfs_server_list_open, 1214 .read = seq_read, 1215 .llseek = seq_lseek, 1216 .release = seq_release_net, 1217 .owner = THIS_MODULE, 1218 }; 1219 1220 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1221 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1222 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1223 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1224 static int nfs_volume_list_show(struct seq_file *m, void *v); 1225 1226 static const struct seq_operations nfs_volume_list_ops = { 1227 .start = nfs_volume_list_start, 1228 .next = nfs_volume_list_next, 1229 .stop = nfs_volume_list_stop, 1230 .show = nfs_volume_list_show, 1231 }; 1232 1233 static const struct file_operations nfs_volume_list_fops = { 1234 .open = nfs_volume_list_open, 1235 .read = seq_read, 1236 .llseek = seq_lseek, 1237 .release = seq_release_net, 1238 .owner = THIS_MODULE, 1239 }; 1240 1241 /* 1242 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1243 * we're dealing 1244 */ 1245 static int nfs_server_list_open(struct inode *inode, struct file *file) 1246 { 1247 return seq_open_net(inode, file, &nfs_server_list_ops, 1248 sizeof(struct seq_net_private)); 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 __acquires(&nn->nfs_client_lock) 1256 { 1257 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1258 1259 /* lock the list against modification */ 1260 spin_lock(&nn->nfs_client_lock); 1261 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1262 } 1263 1264 /* 1265 * move to next server 1266 */ 1267 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1268 { 1269 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1270 1271 return seq_list_next(v, &nn->nfs_client_list, pos); 1272 } 1273 1274 /* 1275 * clean up after reading from the transports list 1276 */ 1277 static void nfs_server_list_stop(struct seq_file *p, void *v) 1278 __releases(&nn->nfs_client_lock) 1279 { 1280 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1281 1282 spin_unlock(&nn->nfs_client_lock); 1283 } 1284 1285 /* 1286 * display a header line followed by a load of call lines 1287 */ 1288 static int nfs_server_list_show(struct seq_file *m, void *v) 1289 { 1290 struct nfs_client *clp; 1291 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1292 1293 /* display header on line 1 */ 1294 if (v == &nn->nfs_client_list) { 1295 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1296 return 0; 1297 } 1298 1299 /* display one transport per line on subsequent lines */ 1300 clp = list_entry(v, struct nfs_client, cl_share_link); 1301 1302 /* Check if the client is initialized */ 1303 if (clp->cl_cons_state != NFS_CS_READY) 1304 return 0; 1305 1306 rcu_read_lock(); 1307 seq_printf(m, "v%u %s %s %3d %s\n", 1308 clp->rpc_ops->version, 1309 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1310 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1311 atomic_read(&clp->cl_count), 1312 clp->cl_hostname); 1313 rcu_read_unlock(); 1314 1315 return 0; 1316 } 1317 1318 /* 1319 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1320 */ 1321 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1322 { 1323 return seq_open_net(inode, file, &nfs_volume_list_ops, 1324 sizeof(struct seq_net_private)); 1325 } 1326 1327 /* 1328 * set up the iterator to start reading from the volume list and return the first item 1329 */ 1330 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1331 __acquires(&nn->nfs_client_lock) 1332 { 1333 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1334 1335 /* lock the list against modification */ 1336 spin_lock(&nn->nfs_client_lock); 1337 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1338 } 1339 1340 /* 1341 * move to next volume 1342 */ 1343 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1344 { 1345 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1346 1347 return seq_list_next(v, &nn->nfs_volume_list, pos); 1348 } 1349 1350 /* 1351 * clean up after reading from the transports list 1352 */ 1353 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1354 __releases(&nn->nfs_client_lock) 1355 { 1356 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1357 1358 spin_unlock(&nn->nfs_client_lock); 1359 } 1360 1361 /* 1362 * display a header line followed by a load of call lines 1363 */ 1364 static int nfs_volume_list_show(struct seq_file *m, void *v) 1365 { 1366 struct nfs_server *server; 1367 struct nfs_client *clp; 1368 char dev[8], fsid[17]; 1369 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1370 1371 /* display header on line 1 */ 1372 if (v == &nn->nfs_volume_list) { 1373 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1374 return 0; 1375 } 1376 /* display one transport per line on subsequent lines */ 1377 server = list_entry(v, struct nfs_server, master_link); 1378 clp = server->nfs_client; 1379 1380 snprintf(dev, 8, "%u:%u", 1381 MAJOR(server->s_dev), MINOR(server->s_dev)); 1382 1383 snprintf(fsid, 17, "%llx:%llx", 1384 (unsigned long long) server->fsid.major, 1385 (unsigned long long) server->fsid.minor); 1386 1387 rcu_read_lock(); 1388 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1389 clp->rpc_ops->version, 1390 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1391 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1392 dev, 1393 fsid, 1394 nfs_server_fscache_state(server)); 1395 rcu_read_unlock(); 1396 1397 return 0; 1398 } 1399 1400 int nfs_fs_proc_net_init(struct net *net) 1401 { 1402 struct nfs_net *nn = net_generic(net, nfs_net_id); 1403 struct proc_dir_entry *p; 1404 1405 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1406 if (!nn->proc_nfsfs) 1407 goto error_0; 1408 1409 /* a file of servers with which we're dealing */ 1410 p = proc_create("servers", S_IFREG|S_IRUGO, 1411 nn->proc_nfsfs, &nfs_server_list_fops); 1412 if (!p) 1413 goto error_1; 1414 1415 /* a file of volumes that we have mounted */ 1416 p = proc_create("volumes", S_IFREG|S_IRUGO, 1417 nn->proc_nfsfs, &nfs_volume_list_fops); 1418 if (!p) 1419 goto error_1; 1420 return 0; 1421 1422 error_1: 1423 remove_proc_subtree("nfsfs", net->proc_net); 1424 error_0: 1425 return -ENOMEM; 1426 } 1427 1428 void nfs_fs_proc_net_exit(struct net *net) 1429 { 1430 remove_proc_subtree("nfsfs", net->proc_net); 1431 } 1432 1433 /* 1434 * initialise the /proc/fs/nfsfs/ directory 1435 */ 1436 int __init nfs_fs_proc_init(void) 1437 { 1438 struct proc_dir_entry *p; 1439 1440 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1441 if (!proc_fs_nfs) 1442 goto error_0; 1443 1444 /* a file of servers with which we're dealing */ 1445 p = proc_symlink("servers", proc_fs_nfs, "../../net/nfsfs/servers"); 1446 if (!p) 1447 goto error_1; 1448 1449 /* a file of volumes that we have mounted */ 1450 p = proc_symlink("volumes", proc_fs_nfs, "../../net/nfsfs/volumes"); 1451 if (!p) 1452 goto error_2; 1453 return 0; 1454 1455 error_2: 1456 remove_proc_entry("servers", proc_fs_nfs); 1457 error_1: 1458 remove_proc_entry("fs/nfsfs", NULL); 1459 error_0: 1460 return -ENOMEM; 1461 } 1462 1463 /* 1464 * clean up the /proc/fs/nfsfs/ directory 1465 */ 1466 void nfs_fs_proc_exit(void) 1467 { 1468 remove_proc_entry("volumes", proc_fs_nfs); 1469 remove_proc_entry("servers", proc_fs_nfs); 1470 remove_proc_entry("fs/nfsfs", NULL); 1471 } 1472 1473 #endif /* CONFIG_PROC_FS */ 1474