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; 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_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; 858 859 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 860 861 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 862 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 863 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 864 if (server->dtsize > server->rsize) 865 server->dtsize = server->rsize; 866 867 if (server->flags & NFS_MOUNT_NOAC) { 868 server->acregmin = server->acregmax = 0; 869 server->acdirmin = server->acdirmax = 0; 870 } 871 872 server->maxfilesize = fsinfo->maxfilesize; 873 874 server->time_delta = fsinfo->time_delta; 875 876 /* We're airborne Set socket buffersize */ 877 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 878 } 879 880 /* 881 * Probe filesystem information, including the FSID on v2/v3 882 */ 883 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 884 { 885 struct nfs_fsinfo fsinfo; 886 struct nfs_client *clp = server->nfs_client; 887 int error; 888 889 dprintk("--> nfs_probe_fsinfo()\n"); 890 891 if (clp->rpc_ops->set_capabilities != NULL) { 892 error = clp->rpc_ops->set_capabilities(server, mntfh); 893 if (error < 0) 894 goto out_error; 895 } 896 897 fsinfo.fattr = fattr; 898 fsinfo.layouttype = 0; 899 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 900 if (error < 0) 901 goto out_error; 902 903 nfs_server_set_fsinfo(server, &fsinfo); 904 905 /* Get some general file system info */ 906 if (server->namelen == 0) { 907 struct nfs_pathconf pathinfo; 908 909 pathinfo.fattr = fattr; 910 nfs_fattr_init(fattr); 911 912 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 913 server->namelen = pathinfo.max_namelen; 914 } 915 916 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 917 return 0; 918 919 out_error: 920 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 921 return error; 922 } 923 EXPORT_SYMBOL_GPL(nfs_probe_fsinfo); 924 925 /* 926 * Copy useful information when duplicating a server record 927 */ 928 void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 929 { 930 target->flags = source->flags; 931 target->rsize = source->rsize; 932 target->wsize = source->wsize; 933 target->acregmin = source->acregmin; 934 target->acregmax = source->acregmax; 935 target->acdirmin = source->acdirmin; 936 target->acdirmax = source->acdirmax; 937 target->caps = source->caps; 938 target->options = source->options; 939 target->auth_info = source->auth_info; 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 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 EXPORT_SYMBOL_GPL(nfs_server_remove_lists); 975 976 /* 977 * Allocate and initialise a server record 978 */ 979 struct nfs_server *nfs_alloc_server(void) 980 { 981 struct nfs_server *server; 982 983 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 984 if (!server) 985 return NULL; 986 987 server->client = server->client_acl = ERR_PTR(-EINVAL); 988 989 /* Zero out the NFS state stuff */ 990 INIT_LIST_HEAD(&server->client_link); 991 INIT_LIST_HEAD(&server->master_link); 992 INIT_LIST_HEAD(&server->delegations); 993 INIT_LIST_HEAD(&server->layouts); 994 INIT_LIST_HEAD(&server->state_owners_lru); 995 996 atomic_set(&server->active, 0); 997 998 server->io_stats = nfs_alloc_iostats(); 999 if (!server->io_stats) { 1000 kfree(server); 1001 return NULL; 1002 } 1003 1004 if (bdi_init(&server->backing_dev_info)) { 1005 nfs_free_iostats(server->io_stats); 1006 kfree(server); 1007 return NULL; 1008 } 1009 1010 ida_init(&server->openowner_id); 1011 ida_init(&server->lockowner_id); 1012 pnfs_init_server(server); 1013 1014 return server; 1015 } 1016 EXPORT_SYMBOL_GPL(nfs_alloc_server); 1017 1018 /* 1019 * Free up a server record 1020 */ 1021 void nfs_free_server(struct nfs_server *server) 1022 { 1023 dprintk("--> nfs_free_server()\n"); 1024 1025 nfs_server_remove_lists(server); 1026 1027 if (server->destroy != NULL) 1028 server->destroy(server); 1029 1030 if (!IS_ERR(server->client_acl)) 1031 rpc_shutdown_client(server->client_acl); 1032 if (!IS_ERR(server->client)) 1033 rpc_shutdown_client(server->client); 1034 1035 nfs_put_client(server->nfs_client); 1036 1037 ida_destroy(&server->lockowner_id); 1038 ida_destroy(&server->openowner_id); 1039 nfs_free_iostats(server->io_stats); 1040 bdi_destroy(&server->backing_dev_info); 1041 kfree(server); 1042 nfs_release_automount_timer(); 1043 dprintk("<-- nfs_free_server()\n"); 1044 } 1045 EXPORT_SYMBOL_GPL(nfs_free_server); 1046 1047 /* 1048 * Create a version 2 or 3 volume record 1049 * - keyed on server and FSID 1050 */ 1051 struct nfs_server *nfs_create_server(struct nfs_mount_info *mount_info, 1052 struct nfs_subversion *nfs_mod) 1053 { 1054 struct nfs_server *server; 1055 struct nfs_fattr *fattr; 1056 int error; 1057 1058 server = nfs_alloc_server(); 1059 if (!server) 1060 return ERR_PTR(-ENOMEM); 1061 1062 error = -ENOMEM; 1063 fattr = nfs_alloc_fattr(); 1064 if (fattr == NULL) 1065 goto error; 1066 1067 /* Get a client representation */ 1068 error = nfs_init_server(server, mount_info->parsed, nfs_mod); 1069 if (error < 0) 1070 goto error; 1071 1072 /* Probe the root fh to retrieve its FSID */ 1073 error = nfs_probe_fsinfo(server, mount_info->mntfh, fattr); 1074 if (error < 0) 1075 goto error; 1076 if (server->nfs_client->rpc_ops->version == 3) { 1077 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1078 server->namelen = NFS3_MAXNAMLEN; 1079 if (!(mount_info->parsed->flags & NFS_MOUNT_NORDIRPLUS)) 1080 server->caps |= NFS_CAP_READDIRPLUS; 1081 } else { 1082 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1083 server->namelen = NFS2_MAXNAMLEN; 1084 } 1085 1086 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1087 error = nfs_mod->rpc_ops->getattr(server, mount_info->mntfh, fattr, NULL); 1088 if (error < 0) { 1089 dprintk("nfs_create_server: getattr error = %d\n", -error); 1090 goto error; 1091 } 1092 } 1093 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1094 1095 dprintk("Server FSID: %llx:%llx\n", 1096 (unsigned long long) server->fsid.major, 1097 (unsigned long long) server->fsid.minor); 1098 1099 nfs_server_insert_lists(server); 1100 server->mount_time = jiffies; 1101 nfs_free_fattr(fattr); 1102 return server; 1103 1104 error: 1105 nfs_free_fattr(fattr); 1106 nfs_free_server(server); 1107 return ERR_PTR(error); 1108 } 1109 EXPORT_SYMBOL_GPL(nfs_create_server); 1110 1111 /* 1112 * Clone an NFS2, NFS3 or NFS4 server record 1113 */ 1114 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1115 struct nfs_fh *fh, 1116 struct nfs_fattr *fattr, 1117 rpc_authflavor_t flavor) 1118 { 1119 struct nfs_server *server; 1120 struct nfs_fattr *fattr_fsinfo; 1121 int error; 1122 1123 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1124 (unsigned long long) fattr->fsid.major, 1125 (unsigned long long) fattr->fsid.minor); 1126 1127 server = nfs_alloc_server(); 1128 if (!server) 1129 return ERR_PTR(-ENOMEM); 1130 1131 error = -ENOMEM; 1132 fattr_fsinfo = nfs_alloc_fattr(); 1133 if (fattr_fsinfo == NULL) 1134 goto out_free_server; 1135 1136 /* Copy data from the source */ 1137 server->nfs_client = source->nfs_client; 1138 server->destroy = source->destroy; 1139 atomic_inc(&server->nfs_client->cl_count); 1140 nfs_server_copy_userdata(server, source); 1141 1142 server->fsid = fattr->fsid; 1143 1144 error = nfs_init_server_rpcclient(server, 1145 source->client->cl_timeout, 1146 flavor); 1147 if (error < 0) 1148 goto out_free_server; 1149 1150 /* probe the filesystem info for this server filesystem */ 1151 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1152 if (error < 0) 1153 goto out_free_server; 1154 1155 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1156 server->namelen = NFS4_MAXNAMLEN; 1157 1158 dprintk("Cloned FSID: %llx:%llx\n", 1159 (unsigned long long) server->fsid.major, 1160 (unsigned long long) server->fsid.minor); 1161 1162 error = nfs_start_lockd(server); 1163 if (error < 0) 1164 goto out_free_server; 1165 1166 nfs_server_insert_lists(server); 1167 server->mount_time = jiffies; 1168 1169 nfs_free_fattr(fattr_fsinfo); 1170 dprintk("<-- nfs_clone_server() = %p\n", server); 1171 return server; 1172 1173 out_free_server: 1174 nfs_free_fattr(fattr_fsinfo); 1175 nfs_free_server(server); 1176 dprintk("<-- nfs_clone_server() = error %d\n", error); 1177 return ERR_PTR(error); 1178 } 1179 EXPORT_SYMBOL_GPL(nfs_clone_server); 1180 1181 void nfs_clients_init(struct net *net) 1182 { 1183 struct nfs_net *nn = net_generic(net, nfs_net_id); 1184 1185 INIT_LIST_HEAD(&nn->nfs_client_list); 1186 INIT_LIST_HEAD(&nn->nfs_volume_list); 1187 #if IS_ENABLED(CONFIG_NFS_V4) 1188 idr_init(&nn->cb_ident_idr); 1189 #endif 1190 spin_lock_init(&nn->nfs_client_lock); 1191 nn->boot_time = CURRENT_TIME; 1192 } 1193 1194 #ifdef CONFIG_PROC_FS 1195 static int nfs_server_list_open(struct inode *inode, struct file *file); 1196 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1197 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1198 static void nfs_server_list_stop(struct seq_file *p, void *v); 1199 static int nfs_server_list_show(struct seq_file *m, void *v); 1200 1201 static const struct seq_operations nfs_server_list_ops = { 1202 .start = nfs_server_list_start, 1203 .next = nfs_server_list_next, 1204 .stop = nfs_server_list_stop, 1205 .show = nfs_server_list_show, 1206 }; 1207 1208 static const struct file_operations nfs_server_list_fops = { 1209 .open = nfs_server_list_open, 1210 .read = seq_read, 1211 .llseek = seq_lseek, 1212 .release = seq_release_net, 1213 .owner = THIS_MODULE, 1214 }; 1215 1216 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1217 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1218 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1219 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1220 static int nfs_volume_list_show(struct seq_file *m, void *v); 1221 1222 static const struct seq_operations nfs_volume_list_ops = { 1223 .start = nfs_volume_list_start, 1224 .next = nfs_volume_list_next, 1225 .stop = nfs_volume_list_stop, 1226 .show = nfs_volume_list_show, 1227 }; 1228 1229 static const struct file_operations nfs_volume_list_fops = { 1230 .open = nfs_volume_list_open, 1231 .read = seq_read, 1232 .llseek = seq_lseek, 1233 .release = seq_release_net, 1234 .owner = THIS_MODULE, 1235 }; 1236 1237 /* 1238 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1239 * we're dealing 1240 */ 1241 static int nfs_server_list_open(struct inode *inode, struct file *file) 1242 { 1243 return seq_open_net(inode, file, &nfs_server_list_ops, 1244 sizeof(struct seq_net_private)); 1245 } 1246 1247 /* 1248 * set up the iterator to start reading from the server list and return the first item 1249 */ 1250 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1251 __acquires(&nn->nfs_client_lock) 1252 { 1253 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1254 1255 /* lock the list against modification */ 1256 spin_lock(&nn->nfs_client_lock); 1257 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1258 } 1259 1260 /* 1261 * move to next server 1262 */ 1263 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1264 { 1265 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1266 1267 return seq_list_next(v, &nn->nfs_client_list, pos); 1268 } 1269 1270 /* 1271 * clean up after reading from the transports list 1272 */ 1273 static void nfs_server_list_stop(struct seq_file *p, void *v) 1274 __releases(&nn->nfs_client_lock) 1275 { 1276 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1277 1278 spin_unlock(&nn->nfs_client_lock); 1279 } 1280 1281 /* 1282 * display a header line followed by a load of call lines 1283 */ 1284 static int nfs_server_list_show(struct seq_file *m, void *v) 1285 { 1286 struct nfs_client *clp; 1287 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1288 1289 /* display header on line 1 */ 1290 if (v == &nn->nfs_client_list) { 1291 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1292 return 0; 1293 } 1294 1295 /* display one transport per line on subsequent lines */ 1296 clp = list_entry(v, struct nfs_client, cl_share_link); 1297 1298 /* Check if the client is initialized */ 1299 if (clp->cl_cons_state != NFS_CS_READY) 1300 return 0; 1301 1302 rcu_read_lock(); 1303 seq_printf(m, "v%u %s %s %3d %s\n", 1304 clp->rpc_ops->version, 1305 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1306 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1307 atomic_read(&clp->cl_count), 1308 clp->cl_hostname); 1309 rcu_read_unlock(); 1310 1311 return 0; 1312 } 1313 1314 /* 1315 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1316 */ 1317 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1318 { 1319 return seq_open_net(inode, file, &nfs_volume_list_ops, 1320 sizeof(struct seq_net_private)); 1321 } 1322 1323 /* 1324 * set up the iterator to start reading from the volume list and return the first item 1325 */ 1326 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1327 __acquires(&nn->nfs_client_lock) 1328 { 1329 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1330 1331 /* lock the list against modification */ 1332 spin_lock(&nn->nfs_client_lock); 1333 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1334 } 1335 1336 /* 1337 * move to next volume 1338 */ 1339 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1340 { 1341 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1342 1343 return seq_list_next(v, &nn->nfs_volume_list, pos); 1344 } 1345 1346 /* 1347 * clean up after reading from the transports list 1348 */ 1349 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1350 __releases(&nn->nfs_client_lock) 1351 { 1352 struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id); 1353 1354 spin_unlock(&nn->nfs_client_lock); 1355 } 1356 1357 /* 1358 * display a header line followed by a load of call lines 1359 */ 1360 static int nfs_volume_list_show(struct seq_file *m, void *v) 1361 { 1362 struct nfs_server *server; 1363 struct nfs_client *clp; 1364 char dev[13]; // 8 for 2^24, 1 for ':', 3 for 2^8, 1 for '\0' 1365 char fsid[34]; // 2 * 16 for %llx, 1 for ':', 1 for '\0' 1366 struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id); 1367 1368 /* display header on line 1 */ 1369 if (v == &nn->nfs_volume_list) { 1370 seq_puts(m, "NV SERVER PORT DEV FSID" 1371 " FSC\n"); 1372 return 0; 1373 } 1374 /* display one transport per line on subsequent lines */ 1375 server = list_entry(v, struct nfs_server, master_link); 1376 clp = server->nfs_client; 1377 1378 snprintf(dev, sizeof(dev), "%u:%u", 1379 MAJOR(server->s_dev), MINOR(server->s_dev)); 1380 1381 snprintf(fsid, sizeof(fsid), "%llx:%llx", 1382 (unsigned long long) server->fsid.major, 1383 (unsigned long long) server->fsid.minor); 1384 1385 rcu_read_lock(); 1386 seq_printf(m, "v%u %s %s %-12s %-33s %s\n", 1387 clp->rpc_ops->version, 1388 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1389 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1390 dev, 1391 fsid, 1392 nfs_server_fscache_state(server)); 1393 rcu_read_unlock(); 1394 1395 return 0; 1396 } 1397 1398 int nfs_fs_proc_net_init(struct net *net) 1399 { 1400 struct nfs_net *nn = net_generic(net, nfs_net_id); 1401 struct proc_dir_entry *p; 1402 1403 nn->proc_nfsfs = proc_net_mkdir(net, "nfsfs", net->proc_net); 1404 if (!nn->proc_nfsfs) 1405 goto error_0; 1406 1407 /* a file of servers with which we're dealing */ 1408 p = proc_create("servers", S_IFREG|S_IRUGO, 1409 nn->proc_nfsfs, &nfs_server_list_fops); 1410 if (!p) 1411 goto error_1; 1412 1413 /* a file of volumes that we have mounted */ 1414 p = proc_create("volumes", S_IFREG|S_IRUGO, 1415 nn->proc_nfsfs, &nfs_volume_list_fops); 1416 if (!p) 1417 goto error_1; 1418 return 0; 1419 1420 error_1: 1421 remove_proc_subtree("nfsfs", net->proc_net); 1422 error_0: 1423 return -ENOMEM; 1424 } 1425 1426 void nfs_fs_proc_net_exit(struct net *net) 1427 { 1428 remove_proc_subtree("nfsfs", net->proc_net); 1429 } 1430 1431 /* 1432 * initialise the /proc/fs/nfsfs/ directory 1433 */ 1434 int __init nfs_fs_proc_init(void) 1435 { 1436 if (!proc_mkdir("fs/nfsfs", NULL)) 1437 goto error_0; 1438 1439 /* a file of servers with which we're dealing */ 1440 if (!proc_symlink("fs/nfsfs/servers", NULL, "../../net/nfsfs/servers")) 1441 goto error_1; 1442 1443 /* a file of volumes that we have mounted */ 1444 if (!proc_symlink("fs/nfsfs/volumes", NULL, "../../net/nfsfs/volumes")) 1445 goto error_1; 1446 1447 return 0; 1448 error_1: 1449 remove_proc_subtree("fs/nfsfs", NULL); 1450 error_0: 1451 return -ENOMEM; 1452 } 1453 1454 /* 1455 * clean up the /proc/fs/nfsfs/ directory 1456 */ 1457 void nfs_fs_proc_exit(void) 1458 { 1459 remove_proc_subtree("fs/nfsfs", NULL); 1460 } 1461 1462 #endif /* CONFIG_PROC_FS */ 1463