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 <net/ipv6.h> 39 #include <linux/nfs_xdr.h> 40 41 #include <asm/system.h> 42 43 #include "nfs4_fs.h" 44 #include "callback.h" 45 #include "delegation.h" 46 #include "iostat.h" 47 #include "internal.h" 48 49 #define NFSDBG_FACILITY NFSDBG_CLIENT 50 51 static DEFINE_SPINLOCK(nfs_client_lock); 52 static LIST_HEAD(nfs_client_list); 53 static LIST_HEAD(nfs_volume_list); 54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 55 56 /* 57 * RPC cruft for NFS 58 */ 59 static struct rpc_version *nfs_version[5] = { 60 [2] = &nfs_version2, 61 #ifdef CONFIG_NFS_V3 62 [3] = &nfs_version3, 63 #endif 64 #ifdef CONFIG_NFS_V4 65 [4] = &nfs_version4, 66 #endif 67 }; 68 69 struct rpc_program nfs_program = { 70 .name = "nfs", 71 .number = NFS_PROGRAM, 72 .nrvers = ARRAY_SIZE(nfs_version), 73 .version = nfs_version, 74 .stats = &nfs_rpcstat, 75 .pipe_dir_name = "/nfs", 76 }; 77 78 struct rpc_stat nfs_rpcstat = { 79 .program = &nfs_program 80 }; 81 82 83 #ifdef CONFIG_NFS_V3_ACL 84 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 85 static struct rpc_version * nfsacl_version[] = { 86 [3] = &nfsacl_version3, 87 }; 88 89 struct rpc_program nfsacl_program = { 90 .name = "nfsacl", 91 .number = NFS_ACL_PROGRAM, 92 .nrvers = ARRAY_SIZE(nfsacl_version), 93 .version = nfsacl_version, 94 .stats = &nfsacl_rpcstat, 95 }; 96 #endif /* CONFIG_NFS_V3_ACL */ 97 98 struct nfs_client_initdata { 99 const char *hostname; 100 const struct sockaddr *addr; 101 size_t addrlen; 102 const struct nfs_rpc_ops *rpc_ops; 103 int proto; 104 }; 105 106 /* 107 * Allocate a shared client record 108 * 109 * Since these are allocated/deallocated very rarely, we don't 110 * bother putting them in a slab cache... 111 */ 112 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 113 { 114 struct nfs_client *clp; 115 struct rpc_cred *cred; 116 117 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 118 goto error_0; 119 120 clp->rpc_ops = cl_init->rpc_ops; 121 122 if (cl_init->rpc_ops->version == 4) { 123 if (nfs_callback_up() < 0) 124 goto error_2; 125 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 126 } 127 128 atomic_set(&clp->cl_count, 1); 129 clp->cl_cons_state = NFS_CS_INITING; 130 131 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 132 clp->cl_addrlen = cl_init->addrlen; 133 134 if (cl_init->hostname) { 135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 136 if (!clp->cl_hostname) 137 goto error_3; 138 } 139 140 INIT_LIST_HEAD(&clp->cl_superblocks); 141 clp->cl_rpcclient = ERR_PTR(-EINVAL); 142 143 clp->cl_proto = cl_init->proto; 144 145 #ifdef CONFIG_NFS_V4 146 INIT_LIST_HEAD(&clp->cl_delegations); 147 spin_lock_init(&clp->cl_lock); 148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 149 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 150 clp->cl_boot_time = CURRENT_TIME; 151 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 152 #endif 153 cred = rpc_lookup_machine_cred(); 154 if (!IS_ERR(cred)) 155 clp->cl_machine_cred = cred; 156 157 return clp; 158 159 error_3: 160 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 161 nfs_callback_down(); 162 error_2: 163 kfree(clp); 164 error_0: 165 return NULL; 166 } 167 168 static void nfs4_shutdown_client(struct nfs_client *clp) 169 { 170 #ifdef CONFIG_NFS_V4 171 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 172 nfs4_kill_renewd(clp); 173 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners)); 174 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 175 nfs_idmap_delete(clp); 176 177 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 178 #endif 179 } 180 181 /* 182 * Destroy a shared client record 183 */ 184 static void nfs_free_client(struct nfs_client *clp) 185 { 186 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 187 188 nfs4_shutdown_client(clp); 189 190 /* -EIO all pending I/O */ 191 if (!IS_ERR(clp->cl_rpcclient)) 192 rpc_shutdown_client(clp->cl_rpcclient); 193 194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 195 nfs_callback_down(); 196 197 if (clp->cl_machine_cred != NULL) 198 put_rpccred(clp->cl_machine_cred); 199 200 kfree(clp->cl_hostname); 201 kfree(clp); 202 203 dprintk("<-- nfs_free_client()\n"); 204 } 205 206 /* 207 * Release a reference to a shared client record 208 */ 209 void nfs_put_client(struct nfs_client *clp) 210 { 211 if (!clp) 212 return; 213 214 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 215 216 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 217 list_del(&clp->cl_share_link); 218 spin_unlock(&nfs_client_lock); 219 220 BUG_ON(!list_empty(&clp->cl_superblocks)); 221 222 nfs_free_client(clp); 223 } 224 } 225 226 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 227 /* 228 * Test if two ip6 socket addresses refer to the same socket by 229 * comparing relevant fields. The padding bytes specifically, are not 230 * compared. sin6_flowinfo is not compared because it only affects QoS 231 * and sin6_scope_id is only compared if the address is "link local" 232 * because "link local" addresses need only be unique to a specific 233 * link. Conversely, ordinary unicast addresses might have different 234 * sin6_scope_id. 235 * 236 * The caller should ensure both socket addresses are AF_INET6. 237 */ 238 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 239 const struct sockaddr *sa2) 240 { 241 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 242 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 243 244 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 245 sin1->sin6_scope_id != sin2->sin6_scope_id) 246 return 0; 247 248 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); 249 } 250 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 251 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 252 const struct sockaddr *sa2) 253 { 254 return 0; 255 } 256 #endif 257 258 /* 259 * Test if two ip4 socket addresses refer to the same socket, by 260 * comparing relevant fields. The padding bytes specifically, are 261 * not compared. 262 * 263 * The caller should ensure both socket addresses are AF_INET. 264 */ 265 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 266 const struct sockaddr *sa2) 267 { 268 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 269 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 270 271 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 272 } 273 274 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 275 const struct sockaddr *sa2) 276 { 277 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 278 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 279 280 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 281 (sin1->sin6_port == sin2->sin6_port); 282 } 283 284 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 285 const struct sockaddr *sa2) 286 { 287 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 288 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 289 290 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 291 (sin1->sin_port == sin2->sin_port); 292 } 293 294 /* 295 * Test if two socket addresses represent the same actual socket, 296 * by comparing (only) relevant fields, excluding the port number. 297 */ 298 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 299 const struct sockaddr *sa2) 300 { 301 if (sa1->sa_family != sa2->sa_family) 302 return 0; 303 304 switch (sa1->sa_family) { 305 case AF_INET: 306 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 307 case AF_INET6: 308 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 309 } 310 return 0; 311 } 312 313 /* 314 * Test if two socket addresses represent the same actual socket, 315 * by comparing (only) relevant fields, including the port number. 316 */ 317 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 318 const struct sockaddr *sa2) 319 { 320 if (sa1->sa_family != sa2->sa_family) 321 return 0; 322 323 switch (sa1->sa_family) { 324 case AF_INET: 325 return nfs_sockaddr_cmp_ip4(sa1, sa2); 326 case AF_INET6: 327 return nfs_sockaddr_cmp_ip6(sa1, sa2); 328 } 329 return 0; 330 } 331 332 /* 333 * Find a client by IP address and protocol version 334 * - returns NULL if no such client 335 */ 336 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 337 { 338 struct nfs_client *clp; 339 340 spin_lock(&nfs_client_lock); 341 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 342 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 343 344 /* Don't match clients that failed to initialise properly */ 345 if (clp->cl_cons_state != NFS_CS_READY) 346 continue; 347 348 /* Different NFS versions cannot share the same nfs_client */ 349 if (clp->rpc_ops->version != nfsversion) 350 continue; 351 352 /* Match only the IP address, not the port number */ 353 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 354 continue; 355 356 atomic_inc(&clp->cl_count); 357 spin_unlock(&nfs_client_lock); 358 return clp; 359 } 360 spin_unlock(&nfs_client_lock); 361 return NULL; 362 } 363 364 /* 365 * Find a client by IP address and protocol version 366 * - returns NULL if no such client 367 */ 368 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 369 { 370 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 371 u32 nfsvers = clp->rpc_ops->version; 372 373 spin_lock(&nfs_client_lock); 374 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 375 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 376 377 /* Don't match clients that failed to initialise properly */ 378 if (clp->cl_cons_state != NFS_CS_READY) 379 continue; 380 381 /* Different NFS versions cannot share the same nfs_client */ 382 if (clp->rpc_ops->version != nfsvers) 383 continue; 384 385 /* Match only the IP address, not the port number */ 386 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 387 continue; 388 389 atomic_inc(&clp->cl_count); 390 spin_unlock(&nfs_client_lock); 391 return clp; 392 } 393 spin_unlock(&nfs_client_lock); 394 return NULL; 395 } 396 397 /* 398 * Find an nfs_client on the list that matches the initialisation data 399 * that is supplied. 400 */ 401 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 402 { 403 struct nfs_client *clp; 404 const struct sockaddr *sap = data->addr; 405 406 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 407 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 408 /* Don't match clients that failed to initialise properly */ 409 if (clp->cl_cons_state < 0) 410 continue; 411 412 /* Different NFS versions cannot share the same nfs_client */ 413 if (clp->rpc_ops != data->rpc_ops) 414 continue; 415 416 if (clp->cl_proto != data->proto) 417 continue; 418 419 /* Match the full socket address */ 420 if (!nfs_sockaddr_cmp(sap, clap)) 421 continue; 422 423 atomic_inc(&clp->cl_count); 424 return clp; 425 } 426 return NULL; 427 } 428 429 /* 430 * Look up a client by IP address and protocol version 431 * - creates a new record if one doesn't yet exist 432 */ 433 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 434 { 435 struct nfs_client *clp, *new = NULL; 436 int error; 437 438 dprintk("--> nfs_get_client(%s,v%u)\n", 439 cl_init->hostname ?: "", cl_init->rpc_ops->version); 440 441 /* see if the client already exists */ 442 do { 443 spin_lock(&nfs_client_lock); 444 445 clp = nfs_match_client(cl_init); 446 if (clp) 447 goto found_client; 448 if (new) 449 goto install_client; 450 451 spin_unlock(&nfs_client_lock); 452 453 new = nfs_alloc_client(cl_init); 454 } while (new); 455 456 return ERR_PTR(-ENOMEM); 457 458 /* install a new client and return with it unready */ 459 install_client: 460 clp = new; 461 list_add(&clp->cl_share_link, &nfs_client_list); 462 spin_unlock(&nfs_client_lock); 463 dprintk("--> nfs_get_client() = %p [new]\n", clp); 464 return clp; 465 466 /* found an existing client 467 * - make sure it's ready before returning 468 */ 469 found_client: 470 spin_unlock(&nfs_client_lock); 471 472 if (new) 473 nfs_free_client(new); 474 475 error = wait_event_killable(nfs_client_active_wq, 476 clp->cl_cons_state != NFS_CS_INITING); 477 if (error < 0) { 478 nfs_put_client(clp); 479 return ERR_PTR(-ERESTARTSYS); 480 } 481 482 if (clp->cl_cons_state < NFS_CS_READY) { 483 error = clp->cl_cons_state; 484 nfs_put_client(clp); 485 return ERR_PTR(error); 486 } 487 488 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 489 490 dprintk("--> nfs_get_client() = %p [share]\n", clp); 491 return clp; 492 } 493 494 /* 495 * Mark a server as ready or failed 496 */ 497 static void nfs_mark_client_ready(struct nfs_client *clp, int state) 498 { 499 clp->cl_cons_state = state; 500 wake_up_all(&nfs_client_active_wq); 501 } 502 503 /* 504 * Initialise the timeout values for a connection 505 */ 506 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 507 unsigned int timeo, unsigned int retrans) 508 { 509 to->to_initval = timeo * HZ / 10; 510 to->to_retries = retrans; 511 512 switch (proto) { 513 case XPRT_TRANSPORT_TCP: 514 case XPRT_TRANSPORT_RDMA: 515 if (to->to_retries == 0) 516 to->to_retries = NFS_DEF_TCP_RETRANS; 517 if (to->to_initval == 0) 518 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 519 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 520 to->to_initval = NFS_MAX_TCP_TIMEOUT; 521 to->to_increment = to->to_initval; 522 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 523 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 524 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 525 if (to->to_maxval < to->to_initval) 526 to->to_maxval = to->to_initval; 527 to->to_exponential = 0; 528 break; 529 case XPRT_TRANSPORT_UDP: 530 if (to->to_retries == 0) 531 to->to_retries = NFS_DEF_UDP_RETRANS; 532 if (!to->to_initval) 533 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 534 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 535 to->to_initval = NFS_MAX_UDP_TIMEOUT; 536 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 537 to->to_exponential = 1; 538 break; 539 default: 540 BUG(); 541 } 542 } 543 544 /* 545 * Create an RPC client handle 546 */ 547 static int nfs_create_rpc_client(struct nfs_client *clp, 548 const struct rpc_timeout *timeparms, 549 rpc_authflavor_t flavor, 550 int discrtry, int noresvport) 551 { 552 struct rpc_clnt *clnt = NULL; 553 struct rpc_create_args args = { 554 .protocol = clp->cl_proto, 555 .address = (struct sockaddr *)&clp->cl_addr, 556 .addrsize = clp->cl_addrlen, 557 .timeout = timeparms, 558 .servername = clp->cl_hostname, 559 .program = &nfs_program, 560 .version = clp->rpc_ops->version, 561 .authflavor = flavor, 562 }; 563 564 if (discrtry) 565 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 566 if (noresvport) 567 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 568 569 if (!IS_ERR(clp->cl_rpcclient)) 570 return 0; 571 572 clnt = rpc_create(&args); 573 if (IS_ERR(clnt)) { 574 dprintk("%s: cannot create RPC client. Error = %ld\n", 575 __func__, PTR_ERR(clnt)); 576 return PTR_ERR(clnt); 577 } 578 579 clp->cl_rpcclient = clnt; 580 return 0; 581 } 582 583 /* 584 * Version 2 or 3 client destruction 585 */ 586 static void nfs_destroy_server(struct nfs_server *server) 587 { 588 if (!(server->flags & NFS_MOUNT_NONLM)) 589 nlmclnt_done(server->nlm_host); 590 } 591 592 /* 593 * Version 2 or 3 lockd setup 594 */ 595 static int nfs_start_lockd(struct nfs_server *server) 596 { 597 struct nlm_host *host; 598 struct nfs_client *clp = server->nfs_client; 599 struct nlmclnt_initdata nlm_init = { 600 .hostname = clp->cl_hostname, 601 .address = (struct sockaddr *)&clp->cl_addr, 602 .addrlen = clp->cl_addrlen, 603 .protocol = server->flags & NFS_MOUNT_TCP ? 604 IPPROTO_TCP : IPPROTO_UDP, 605 .nfs_version = clp->rpc_ops->version, 606 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 607 1 : 0, 608 }; 609 610 if (nlm_init.nfs_version > 3) 611 return 0; 612 if (server->flags & NFS_MOUNT_NONLM) 613 return 0; 614 615 host = nlmclnt_init(&nlm_init); 616 if (IS_ERR(host)) 617 return PTR_ERR(host); 618 619 server->nlm_host = host; 620 server->destroy = nfs_destroy_server; 621 return 0; 622 } 623 624 /* 625 * Initialise an NFSv3 ACL client connection 626 */ 627 #ifdef CONFIG_NFS_V3_ACL 628 static void nfs_init_server_aclclient(struct nfs_server *server) 629 { 630 if (server->nfs_client->rpc_ops->version != 3) 631 goto out_noacl; 632 if (server->flags & NFS_MOUNT_NOACL) 633 goto out_noacl; 634 635 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 636 if (IS_ERR(server->client_acl)) 637 goto out_noacl; 638 639 /* No errors! Assume that Sun nfsacls are supported */ 640 server->caps |= NFS_CAP_ACLS; 641 return; 642 643 out_noacl: 644 server->caps &= ~NFS_CAP_ACLS; 645 } 646 #else 647 static inline void nfs_init_server_aclclient(struct nfs_server *server) 648 { 649 server->flags &= ~NFS_MOUNT_NOACL; 650 server->caps &= ~NFS_CAP_ACLS; 651 } 652 #endif 653 654 /* 655 * Create a general RPC client 656 */ 657 static int nfs_init_server_rpcclient(struct nfs_server *server, 658 const struct rpc_timeout *timeo, 659 rpc_authflavor_t pseudoflavour) 660 { 661 struct nfs_client *clp = server->nfs_client; 662 663 server->client = rpc_clone_client(clp->cl_rpcclient); 664 if (IS_ERR(server->client)) { 665 dprintk("%s: couldn't create rpc_client!\n", __func__); 666 return PTR_ERR(server->client); 667 } 668 669 memcpy(&server->client->cl_timeout_default, 670 timeo, 671 sizeof(server->client->cl_timeout_default)); 672 server->client->cl_timeout = &server->client->cl_timeout_default; 673 674 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 675 struct rpc_auth *auth; 676 677 auth = rpcauth_create(pseudoflavour, server->client); 678 if (IS_ERR(auth)) { 679 dprintk("%s: couldn't create credcache!\n", __func__); 680 return PTR_ERR(auth); 681 } 682 } 683 server->client->cl_softrtry = 0; 684 if (server->flags & NFS_MOUNT_SOFT) 685 server->client->cl_softrtry = 1; 686 687 return 0; 688 } 689 690 /* 691 * Initialise an NFS2 or NFS3 client 692 */ 693 static int nfs_init_client(struct nfs_client *clp, 694 const struct rpc_timeout *timeparms, 695 const struct nfs_parsed_mount_data *data) 696 { 697 int error; 698 699 if (clp->cl_cons_state == NFS_CS_READY) { 700 /* the client is already initialised */ 701 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 702 return 0; 703 } 704 705 /* 706 * Create a client RPC handle for doing FSSTAT with UNIX auth only 707 * - RFC 2623, sec 2.3.2 708 */ 709 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 710 0, data->flags & NFS_MOUNT_NORESVPORT); 711 if (error < 0) 712 goto error; 713 nfs_mark_client_ready(clp, NFS_CS_READY); 714 return 0; 715 716 error: 717 nfs_mark_client_ready(clp, error); 718 dprintk("<-- nfs_init_client() = xerror %d\n", error); 719 return error; 720 } 721 722 /* 723 * Create a version 2 or 3 client 724 */ 725 static int nfs_init_server(struct nfs_server *server, 726 const struct nfs_parsed_mount_data *data) 727 { 728 struct nfs_client_initdata cl_init = { 729 .hostname = data->nfs_server.hostname, 730 .addr = (const struct sockaddr *)&data->nfs_server.address, 731 .addrlen = data->nfs_server.addrlen, 732 .rpc_ops = &nfs_v2_clientops, 733 .proto = data->nfs_server.protocol, 734 }; 735 struct rpc_timeout timeparms; 736 struct nfs_client *clp; 737 int error; 738 739 dprintk("--> nfs_init_server()\n"); 740 741 #ifdef CONFIG_NFS_V3 742 if (data->flags & NFS_MOUNT_VER3) 743 cl_init.rpc_ops = &nfs_v3_clientops; 744 #endif 745 746 /* Allocate or find a client reference we can use */ 747 clp = nfs_get_client(&cl_init); 748 if (IS_ERR(clp)) { 749 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 750 return PTR_ERR(clp); 751 } 752 753 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 754 data->timeo, data->retrans); 755 error = nfs_init_client(clp, &timeparms, data); 756 if (error < 0) 757 goto error; 758 759 server->nfs_client = clp; 760 761 /* Initialise the client representation from the mount data */ 762 server->flags = data->flags; 763 764 if (data->rsize) 765 server->rsize = nfs_block_size(data->rsize, NULL); 766 if (data->wsize) 767 server->wsize = nfs_block_size(data->wsize, NULL); 768 769 server->acregmin = data->acregmin * HZ; 770 server->acregmax = data->acregmax * HZ; 771 server->acdirmin = data->acdirmin * HZ; 772 server->acdirmax = data->acdirmax * HZ; 773 774 /* Start lockd here, before we might error out */ 775 error = nfs_start_lockd(server); 776 if (error < 0) 777 goto error; 778 779 server->port = data->nfs_server.port; 780 781 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 782 if (error < 0) 783 goto error; 784 785 /* Preserve the values of mount_server-related mount options */ 786 if (data->mount_server.addrlen) { 787 memcpy(&server->mountd_address, &data->mount_server.address, 788 data->mount_server.addrlen); 789 server->mountd_addrlen = data->mount_server.addrlen; 790 } 791 server->mountd_version = data->mount_server.version; 792 server->mountd_port = data->mount_server.port; 793 server->mountd_protocol = data->mount_server.protocol; 794 795 server->namelen = data->namlen; 796 /* Create a client RPC handle for the NFSv3 ACL management interface */ 797 nfs_init_server_aclclient(server); 798 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 799 return 0; 800 801 error: 802 server->nfs_client = NULL; 803 nfs_put_client(clp); 804 dprintk("<-- nfs_init_server() = xerror %d\n", error); 805 return error; 806 } 807 808 /* 809 * Load up the server record from information gained in an fsinfo record 810 */ 811 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 812 { 813 unsigned long max_rpc_payload; 814 815 /* Work out a lot of parameters */ 816 if (server->rsize == 0) 817 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 818 if (server->wsize == 0) 819 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 820 821 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 822 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 823 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 824 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 825 826 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 827 if (server->rsize > max_rpc_payload) 828 server->rsize = max_rpc_payload; 829 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 830 server->rsize = NFS_MAX_FILE_IO_SIZE; 831 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 832 833 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 834 835 if (server->wsize > max_rpc_payload) 836 server->wsize = max_rpc_payload; 837 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 838 server->wsize = NFS_MAX_FILE_IO_SIZE; 839 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 840 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 841 842 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 843 if (server->dtsize > PAGE_CACHE_SIZE) 844 server->dtsize = PAGE_CACHE_SIZE; 845 if (server->dtsize > server->rsize) 846 server->dtsize = server->rsize; 847 848 if (server->flags & NFS_MOUNT_NOAC) { 849 server->acregmin = server->acregmax = 0; 850 server->acdirmin = server->acdirmax = 0; 851 } 852 853 server->maxfilesize = fsinfo->maxfilesize; 854 855 /* We're airborne Set socket buffersize */ 856 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 857 } 858 859 /* 860 * Probe filesystem information, including the FSID on v2/v3 861 */ 862 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 863 { 864 struct nfs_fsinfo fsinfo; 865 struct nfs_client *clp = server->nfs_client; 866 int error; 867 868 dprintk("--> nfs_probe_fsinfo()\n"); 869 870 if (clp->rpc_ops->set_capabilities != NULL) { 871 error = clp->rpc_ops->set_capabilities(server, mntfh); 872 if (error < 0) 873 goto out_error; 874 } 875 876 fsinfo.fattr = fattr; 877 nfs_fattr_init(fattr); 878 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 879 if (error < 0) 880 goto out_error; 881 882 nfs_server_set_fsinfo(server, &fsinfo); 883 error = bdi_init(&server->backing_dev_info); 884 if (error) 885 goto out_error; 886 887 888 /* Get some general file system info */ 889 if (server->namelen == 0) { 890 struct nfs_pathconf pathinfo; 891 892 pathinfo.fattr = fattr; 893 nfs_fattr_init(fattr); 894 895 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 896 server->namelen = pathinfo.max_namelen; 897 } 898 899 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 900 return 0; 901 902 out_error: 903 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 904 return error; 905 } 906 907 /* 908 * Copy useful information when duplicating a server record 909 */ 910 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 911 { 912 target->flags = source->flags; 913 target->acregmin = source->acregmin; 914 target->acregmax = source->acregmax; 915 target->acdirmin = source->acdirmin; 916 target->acdirmax = source->acdirmax; 917 target->caps = source->caps; 918 } 919 920 /* 921 * Allocate and initialise a server record 922 */ 923 static struct nfs_server *nfs_alloc_server(void) 924 { 925 struct nfs_server *server; 926 927 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 928 if (!server) 929 return NULL; 930 931 server->client = server->client_acl = ERR_PTR(-EINVAL); 932 933 /* Zero out the NFS state stuff */ 934 INIT_LIST_HEAD(&server->client_link); 935 INIT_LIST_HEAD(&server->master_link); 936 937 atomic_set(&server->active, 0); 938 939 server->io_stats = nfs_alloc_iostats(); 940 if (!server->io_stats) { 941 kfree(server); 942 return NULL; 943 } 944 945 return server; 946 } 947 948 /* 949 * Free up a server record 950 */ 951 void nfs_free_server(struct nfs_server *server) 952 { 953 dprintk("--> nfs_free_server()\n"); 954 955 spin_lock(&nfs_client_lock); 956 list_del(&server->client_link); 957 list_del(&server->master_link); 958 spin_unlock(&nfs_client_lock); 959 960 if (server->destroy != NULL) 961 server->destroy(server); 962 963 if (!IS_ERR(server->client_acl)) 964 rpc_shutdown_client(server->client_acl); 965 if (!IS_ERR(server->client)) 966 rpc_shutdown_client(server->client); 967 968 nfs_put_client(server->nfs_client); 969 970 nfs_free_iostats(server->io_stats); 971 bdi_destroy(&server->backing_dev_info); 972 kfree(server); 973 nfs_release_automount_timer(); 974 dprintk("<-- nfs_free_server()\n"); 975 } 976 977 /* 978 * Create a version 2 or 3 volume record 979 * - keyed on server and FSID 980 */ 981 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 982 struct nfs_fh *mntfh) 983 { 984 struct nfs_server *server; 985 struct nfs_fattr fattr; 986 int error; 987 988 server = nfs_alloc_server(); 989 if (!server) 990 return ERR_PTR(-ENOMEM); 991 992 /* Get a client representation */ 993 error = nfs_init_server(server, data); 994 if (error < 0) 995 goto error; 996 997 BUG_ON(!server->nfs_client); 998 BUG_ON(!server->nfs_client->rpc_ops); 999 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1000 1001 /* Probe the root fh to retrieve its FSID */ 1002 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1003 if (error < 0) 1004 goto error; 1005 if (server->nfs_client->rpc_ops->version == 3) { 1006 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1007 server->namelen = NFS3_MAXNAMLEN; 1008 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1009 server->caps |= NFS_CAP_READDIRPLUS; 1010 } else { 1011 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1012 server->namelen = NFS2_MAXNAMLEN; 1013 } 1014 1015 if (!(fattr.valid & NFS_ATTR_FATTR)) { 1016 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 1017 if (error < 0) { 1018 dprintk("nfs_create_server: getattr error = %d\n", -error); 1019 goto error; 1020 } 1021 } 1022 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 1023 1024 dprintk("Server FSID: %llx:%llx\n", 1025 (unsigned long long) server->fsid.major, 1026 (unsigned long long) server->fsid.minor); 1027 1028 BUG_ON(!server->nfs_client); 1029 BUG_ON(!server->nfs_client->rpc_ops); 1030 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1031 1032 spin_lock(&nfs_client_lock); 1033 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1034 list_add_tail(&server->master_link, &nfs_volume_list); 1035 spin_unlock(&nfs_client_lock); 1036 1037 server->mount_time = jiffies; 1038 return server; 1039 1040 error: 1041 nfs_free_server(server); 1042 return ERR_PTR(error); 1043 } 1044 1045 #ifdef CONFIG_NFS_V4 1046 /* 1047 * Initialise an NFS4 client record 1048 */ 1049 static int nfs4_init_client(struct nfs_client *clp, 1050 const struct rpc_timeout *timeparms, 1051 const char *ip_addr, 1052 rpc_authflavor_t authflavour, 1053 int flags) 1054 { 1055 int error; 1056 1057 if (clp->cl_cons_state == NFS_CS_READY) { 1058 /* the client is initialised already */ 1059 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1060 return 0; 1061 } 1062 1063 /* Check NFS protocol revision and initialize RPC op vector */ 1064 clp->rpc_ops = &nfs_v4_clientops; 1065 1066 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1067 1, flags & NFS_MOUNT_NORESVPORT); 1068 if (error < 0) 1069 goto error; 1070 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1071 1072 error = nfs_idmap_new(clp); 1073 if (error < 0) { 1074 dprintk("%s: failed to create idmapper. Error = %d\n", 1075 __func__, error); 1076 goto error; 1077 } 1078 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1079 1080 nfs_mark_client_ready(clp, NFS_CS_READY); 1081 return 0; 1082 1083 error: 1084 nfs_mark_client_ready(clp, error); 1085 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1086 return error; 1087 } 1088 1089 /* 1090 * Set up an NFS4 client 1091 */ 1092 static int nfs4_set_client(struct nfs_server *server, 1093 const char *hostname, 1094 const struct sockaddr *addr, 1095 const size_t addrlen, 1096 const char *ip_addr, 1097 rpc_authflavor_t authflavour, 1098 int proto, const struct rpc_timeout *timeparms) 1099 { 1100 struct nfs_client_initdata cl_init = { 1101 .hostname = hostname, 1102 .addr = addr, 1103 .addrlen = addrlen, 1104 .rpc_ops = &nfs_v4_clientops, 1105 .proto = proto, 1106 }; 1107 struct nfs_client *clp; 1108 int error; 1109 1110 dprintk("--> nfs4_set_client()\n"); 1111 1112 /* Allocate or find a client reference we can use */ 1113 clp = nfs_get_client(&cl_init); 1114 if (IS_ERR(clp)) { 1115 error = PTR_ERR(clp); 1116 goto error; 1117 } 1118 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1119 server->flags); 1120 if (error < 0) 1121 goto error_put; 1122 1123 server->nfs_client = clp; 1124 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1125 return 0; 1126 1127 error_put: 1128 nfs_put_client(clp); 1129 error: 1130 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1131 return error; 1132 } 1133 1134 /* 1135 * Create a version 4 volume record 1136 */ 1137 static int nfs4_init_server(struct nfs_server *server, 1138 const struct nfs_parsed_mount_data *data) 1139 { 1140 struct rpc_timeout timeparms; 1141 int error; 1142 1143 dprintk("--> nfs4_init_server()\n"); 1144 1145 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1146 data->timeo, data->retrans); 1147 1148 /* Initialise the client representation from the mount data */ 1149 server->flags = data->flags; 1150 server->caps |= NFS_CAP_ATOMIC_OPEN; 1151 1152 /* Get a client record */ 1153 error = nfs4_set_client(server, 1154 data->nfs_server.hostname, 1155 (const struct sockaddr *)&data->nfs_server.address, 1156 data->nfs_server.addrlen, 1157 data->client_address, 1158 data->auth_flavors[0], 1159 data->nfs_server.protocol, 1160 &timeparms); 1161 if (error < 0) 1162 goto error; 1163 1164 if (data->rsize) 1165 server->rsize = nfs_block_size(data->rsize, NULL); 1166 if (data->wsize) 1167 server->wsize = nfs_block_size(data->wsize, NULL); 1168 1169 server->acregmin = data->acregmin * HZ; 1170 server->acregmax = data->acregmax * HZ; 1171 server->acdirmin = data->acdirmin * HZ; 1172 server->acdirmax = data->acdirmax * HZ; 1173 1174 server->port = data->nfs_server.port; 1175 1176 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1177 1178 error: 1179 /* Done */ 1180 dprintk("<-- nfs4_init_server() = %d\n", error); 1181 return error; 1182 } 1183 1184 /* 1185 * Create a version 4 volume record 1186 * - keyed on server and FSID 1187 */ 1188 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1189 struct nfs_fh *mntfh) 1190 { 1191 struct nfs_fattr fattr; 1192 struct nfs_server *server; 1193 int error; 1194 1195 dprintk("--> nfs4_create_server()\n"); 1196 1197 server = nfs_alloc_server(); 1198 if (!server) 1199 return ERR_PTR(-ENOMEM); 1200 1201 /* set up the general RPC client */ 1202 error = nfs4_init_server(server, data); 1203 if (error < 0) 1204 goto error; 1205 1206 BUG_ON(!server->nfs_client); 1207 BUG_ON(!server->nfs_client->rpc_ops); 1208 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1209 1210 /* Probe the root fh to retrieve its FSID */ 1211 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1212 if (error < 0) 1213 goto error; 1214 1215 dprintk("Server FSID: %llx:%llx\n", 1216 (unsigned long long) server->fsid.major, 1217 (unsigned long long) server->fsid.minor); 1218 dprintk("Mount FH: %d\n", mntfh->size); 1219 1220 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1221 if (error < 0) 1222 goto error; 1223 1224 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1225 server->namelen = NFS4_MAXNAMLEN; 1226 1227 BUG_ON(!server->nfs_client); 1228 BUG_ON(!server->nfs_client->rpc_ops); 1229 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1230 1231 spin_lock(&nfs_client_lock); 1232 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1233 list_add_tail(&server->master_link, &nfs_volume_list); 1234 spin_unlock(&nfs_client_lock); 1235 1236 server->mount_time = jiffies; 1237 dprintk("<-- nfs4_create_server() = %p\n", server); 1238 return server; 1239 1240 error: 1241 nfs_free_server(server); 1242 dprintk("<-- nfs4_create_server() = error %d\n", error); 1243 return ERR_PTR(error); 1244 } 1245 1246 /* 1247 * Create an NFS4 referral server record 1248 */ 1249 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1250 struct nfs_fh *mntfh) 1251 { 1252 struct nfs_client *parent_client; 1253 struct nfs_server *server, *parent_server; 1254 struct nfs_fattr fattr; 1255 int error; 1256 1257 dprintk("--> nfs4_create_referral_server()\n"); 1258 1259 server = nfs_alloc_server(); 1260 if (!server) 1261 return ERR_PTR(-ENOMEM); 1262 1263 parent_server = NFS_SB(data->sb); 1264 parent_client = parent_server->nfs_client; 1265 1266 /* Initialise the client representation from the parent server */ 1267 nfs_server_copy_userdata(server, parent_server); 1268 server->caps |= NFS_CAP_ATOMIC_OPEN; 1269 1270 /* Get a client representation. 1271 * Note: NFSv4 always uses TCP, */ 1272 error = nfs4_set_client(server, data->hostname, 1273 data->addr, 1274 data->addrlen, 1275 parent_client->cl_ipaddr, 1276 data->authflavor, 1277 parent_server->client->cl_xprt->prot, 1278 parent_server->client->cl_timeout); 1279 if (error < 0) 1280 goto error; 1281 1282 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1283 if (error < 0) 1284 goto error; 1285 1286 BUG_ON(!server->nfs_client); 1287 BUG_ON(!server->nfs_client->rpc_ops); 1288 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1289 1290 /* Probe the root fh to retrieve its FSID and filehandle */ 1291 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1292 if (error < 0) 1293 goto error; 1294 1295 /* probe the filesystem info for this server filesystem */ 1296 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1297 if (error < 0) 1298 goto error; 1299 1300 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1301 server->namelen = NFS4_MAXNAMLEN; 1302 1303 dprintk("Referral FSID: %llx:%llx\n", 1304 (unsigned long long) server->fsid.major, 1305 (unsigned long long) server->fsid.minor); 1306 1307 spin_lock(&nfs_client_lock); 1308 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1309 list_add_tail(&server->master_link, &nfs_volume_list); 1310 spin_unlock(&nfs_client_lock); 1311 1312 server->mount_time = jiffies; 1313 1314 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1315 return server; 1316 1317 error: 1318 nfs_free_server(server); 1319 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1320 return ERR_PTR(error); 1321 } 1322 1323 #endif /* CONFIG_NFS_V4 */ 1324 1325 /* 1326 * Clone an NFS2, NFS3 or NFS4 server record 1327 */ 1328 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1329 struct nfs_fh *fh, 1330 struct nfs_fattr *fattr) 1331 { 1332 struct nfs_server *server; 1333 struct nfs_fattr fattr_fsinfo; 1334 int error; 1335 1336 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1337 (unsigned long long) fattr->fsid.major, 1338 (unsigned long long) fattr->fsid.minor); 1339 1340 server = nfs_alloc_server(); 1341 if (!server) 1342 return ERR_PTR(-ENOMEM); 1343 1344 /* Copy data from the source */ 1345 server->nfs_client = source->nfs_client; 1346 atomic_inc(&server->nfs_client->cl_count); 1347 nfs_server_copy_userdata(server, source); 1348 1349 server->fsid = fattr->fsid; 1350 1351 error = nfs_init_server_rpcclient(server, 1352 source->client->cl_timeout, 1353 source->client->cl_auth->au_flavor); 1354 if (error < 0) 1355 goto out_free_server; 1356 if (!IS_ERR(source->client_acl)) 1357 nfs_init_server_aclclient(server); 1358 1359 /* probe the filesystem info for this server filesystem */ 1360 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1361 if (error < 0) 1362 goto out_free_server; 1363 1364 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1365 server->namelen = NFS4_MAXNAMLEN; 1366 1367 dprintk("Cloned FSID: %llx:%llx\n", 1368 (unsigned long long) server->fsid.major, 1369 (unsigned long long) server->fsid.minor); 1370 1371 error = nfs_start_lockd(server); 1372 if (error < 0) 1373 goto out_free_server; 1374 1375 spin_lock(&nfs_client_lock); 1376 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1377 list_add_tail(&server->master_link, &nfs_volume_list); 1378 spin_unlock(&nfs_client_lock); 1379 1380 server->mount_time = jiffies; 1381 1382 dprintk("<-- nfs_clone_server() = %p\n", server); 1383 return server; 1384 1385 out_free_server: 1386 nfs_free_server(server); 1387 dprintk("<-- nfs_clone_server() = error %d\n", error); 1388 return ERR_PTR(error); 1389 } 1390 1391 #ifdef CONFIG_PROC_FS 1392 static struct proc_dir_entry *proc_fs_nfs; 1393 1394 static int nfs_server_list_open(struct inode *inode, struct file *file); 1395 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1396 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1397 static void nfs_server_list_stop(struct seq_file *p, void *v); 1398 static int nfs_server_list_show(struct seq_file *m, void *v); 1399 1400 static struct seq_operations nfs_server_list_ops = { 1401 .start = nfs_server_list_start, 1402 .next = nfs_server_list_next, 1403 .stop = nfs_server_list_stop, 1404 .show = nfs_server_list_show, 1405 }; 1406 1407 static const struct file_operations nfs_server_list_fops = { 1408 .open = nfs_server_list_open, 1409 .read = seq_read, 1410 .llseek = seq_lseek, 1411 .release = seq_release, 1412 .owner = THIS_MODULE, 1413 }; 1414 1415 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1416 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1417 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1418 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1419 static int nfs_volume_list_show(struct seq_file *m, void *v); 1420 1421 static struct seq_operations nfs_volume_list_ops = { 1422 .start = nfs_volume_list_start, 1423 .next = nfs_volume_list_next, 1424 .stop = nfs_volume_list_stop, 1425 .show = nfs_volume_list_show, 1426 }; 1427 1428 static const struct file_operations nfs_volume_list_fops = { 1429 .open = nfs_volume_list_open, 1430 .read = seq_read, 1431 .llseek = seq_lseek, 1432 .release = seq_release, 1433 .owner = THIS_MODULE, 1434 }; 1435 1436 /* 1437 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1438 * we're dealing 1439 */ 1440 static int nfs_server_list_open(struct inode *inode, struct file *file) 1441 { 1442 struct seq_file *m; 1443 int ret; 1444 1445 ret = seq_open(file, &nfs_server_list_ops); 1446 if (ret < 0) 1447 return ret; 1448 1449 m = file->private_data; 1450 m->private = PDE(inode)->data; 1451 1452 return 0; 1453 } 1454 1455 /* 1456 * set up the iterator to start reading from the server list and return the first item 1457 */ 1458 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1459 { 1460 /* lock the list against modification */ 1461 spin_lock(&nfs_client_lock); 1462 return seq_list_start_head(&nfs_client_list, *_pos); 1463 } 1464 1465 /* 1466 * move to next server 1467 */ 1468 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1469 { 1470 return seq_list_next(v, &nfs_client_list, pos); 1471 } 1472 1473 /* 1474 * clean up after reading from the transports list 1475 */ 1476 static void nfs_server_list_stop(struct seq_file *p, void *v) 1477 { 1478 spin_unlock(&nfs_client_lock); 1479 } 1480 1481 /* 1482 * display a header line followed by a load of call lines 1483 */ 1484 static int nfs_server_list_show(struct seq_file *m, void *v) 1485 { 1486 struct nfs_client *clp; 1487 1488 /* display header on line 1 */ 1489 if (v == &nfs_client_list) { 1490 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1491 return 0; 1492 } 1493 1494 /* display one transport per line on subsequent lines */ 1495 clp = list_entry(v, struct nfs_client, cl_share_link); 1496 1497 seq_printf(m, "v%u %s %s %3d %s\n", 1498 clp->rpc_ops->version, 1499 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1500 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1501 atomic_read(&clp->cl_count), 1502 clp->cl_hostname); 1503 1504 return 0; 1505 } 1506 1507 /* 1508 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1509 */ 1510 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1511 { 1512 struct seq_file *m; 1513 int ret; 1514 1515 ret = seq_open(file, &nfs_volume_list_ops); 1516 if (ret < 0) 1517 return ret; 1518 1519 m = file->private_data; 1520 m->private = PDE(inode)->data; 1521 1522 return 0; 1523 } 1524 1525 /* 1526 * set up the iterator to start reading from the volume list and return the first item 1527 */ 1528 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1529 { 1530 /* lock the list against modification */ 1531 spin_lock(&nfs_client_lock); 1532 return seq_list_start_head(&nfs_volume_list, *_pos); 1533 } 1534 1535 /* 1536 * move to next volume 1537 */ 1538 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1539 { 1540 return seq_list_next(v, &nfs_volume_list, pos); 1541 } 1542 1543 /* 1544 * clean up after reading from the transports list 1545 */ 1546 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1547 { 1548 spin_unlock(&nfs_client_lock); 1549 } 1550 1551 /* 1552 * display a header line followed by a load of call lines 1553 */ 1554 static int nfs_volume_list_show(struct seq_file *m, void *v) 1555 { 1556 struct nfs_server *server; 1557 struct nfs_client *clp; 1558 char dev[8], fsid[17]; 1559 1560 /* display header on line 1 */ 1561 if (v == &nfs_volume_list) { 1562 seq_puts(m, "NV SERVER PORT DEV FSID\n"); 1563 return 0; 1564 } 1565 /* display one transport per line on subsequent lines */ 1566 server = list_entry(v, struct nfs_server, master_link); 1567 clp = server->nfs_client; 1568 1569 snprintf(dev, 8, "%u:%u", 1570 MAJOR(server->s_dev), MINOR(server->s_dev)); 1571 1572 snprintf(fsid, 17, "%llx:%llx", 1573 (unsigned long long) server->fsid.major, 1574 (unsigned long long) server->fsid.minor); 1575 1576 seq_printf(m, "v%u %s %s %-7s %-17s\n", 1577 clp->rpc_ops->version, 1578 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1579 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1580 dev, 1581 fsid); 1582 1583 return 0; 1584 } 1585 1586 /* 1587 * initialise the /proc/fs/nfsfs/ directory 1588 */ 1589 int __init nfs_fs_proc_init(void) 1590 { 1591 struct proc_dir_entry *p; 1592 1593 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1594 if (!proc_fs_nfs) 1595 goto error_0; 1596 1597 /* a file of servers with which we're dealing */ 1598 p = proc_create("servers", S_IFREG|S_IRUGO, 1599 proc_fs_nfs, &nfs_server_list_fops); 1600 if (!p) 1601 goto error_1; 1602 1603 /* a file of volumes that we have mounted */ 1604 p = proc_create("volumes", S_IFREG|S_IRUGO, 1605 proc_fs_nfs, &nfs_volume_list_fops); 1606 if (!p) 1607 goto error_2; 1608 return 0; 1609 1610 error_2: 1611 remove_proc_entry("servers", proc_fs_nfs); 1612 error_1: 1613 remove_proc_entry("fs/nfsfs", NULL); 1614 error_0: 1615 return -ENOMEM; 1616 } 1617 1618 /* 1619 * clean up the /proc/fs/nfsfs/ directory 1620 */ 1621 void nfs_fs_proc_exit(void) 1622 { 1623 remove_proc_entry("volumes", proc_fs_nfs); 1624 remove_proc_entry("servers", proc_fs_nfs); 1625 remove_proc_entry("fs/nfsfs", NULL); 1626 } 1627 1628 #endif /* CONFIG_PROC_FS */ 1629