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 #include "fscache.h" 49 50 #define NFSDBG_FACILITY NFSDBG_CLIENT 51 52 static DEFINE_SPINLOCK(nfs_client_lock); 53 static LIST_HEAD(nfs_client_list); 54 static LIST_HEAD(nfs_volume_list); 55 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 56 57 /* 58 * RPC cruft for NFS 59 */ 60 static struct rpc_version *nfs_version[5] = { 61 [2] = &nfs_version2, 62 #ifdef CONFIG_NFS_V3 63 [3] = &nfs_version3, 64 #endif 65 #ifdef CONFIG_NFS_V4 66 [4] = &nfs_version4, 67 #endif 68 }; 69 70 struct rpc_program nfs_program = { 71 .name = "nfs", 72 .number = NFS_PROGRAM, 73 .nrvers = ARRAY_SIZE(nfs_version), 74 .version = nfs_version, 75 .stats = &nfs_rpcstat, 76 .pipe_dir_name = "/nfs", 77 }; 78 79 struct rpc_stat nfs_rpcstat = { 80 .program = &nfs_program 81 }; 82 83 84 #ifdef CONFIG_NFS_V3_ACL 85 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 86 static struct rpc_version * nfsacl_version[] = { 87 [3] = &nfsacl_version3, 88 }; 89 90 struct rpc_program nfsacl_program = { 91 .name = "nfsacl", 92 .number = NFS_ACL_PROGRAM, 93 .nrvers = ARRAY_SIZE(nfsacl_version), 94 .version = nfsacl_version, 95 .stats = &nfsacl_rpcstat, 96 }; 97 #endif /* CONFIG_NFS_V3_ACL */ 98 99 struct nfs_client_initdata { 100 const char *hostname; 101 const struct sockaddr *addr; 102 size_t addrlen; 103 const struct nfs_rpc_ops *rpc_ops; 104 int proto; 105 }; 106 107 /* 108 * Allocate a shared client record 109 * 110 * Since these are allocated/deallocated very rarely, we don't 111 * bother putting them in a slab cache... 112 */ 113 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 114 { 115 struct nfs_client *clp; 116 struct rpc_cred *cred; 117 118 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 119 goto error_0; 120 121 clp->rpc_ops = cl_init->rpc_ops; 122 123 if (cl_init->rpc_ops->version == 4) { 124 if (nfs_callback_up() < 0) 125 goto error_2; 126 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 127 } 128 129 atomic_set(&clp->cl_count, 1); 130 clp->cl_cons_state = NFS_CS_INITING; 131 132 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 133 clp->cl_addrlen = cl_init->addrlen; 134 135 if (cl_init->hostname) { 136 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 137 if (!clp->cl_hostname) 138 goto error_3; 139 } 140 141 INIT_LIST_HEAD(&clp->cl_superblocks); 142 clp->cl_rpcclient = ERR_PTR(-EINVAL); 143 144 clp->cl_proto = cl_init->proto; 145 146 #ifdef CONFIG_NFS_V4 147 INIT_LIST_HEAD(&clp->cl_delegations); 148 spin_lock_init(&clp->cl_lock); 149 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 150 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 151 clp->cl_boot_time = CURRENT_TIME; 152 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 153 #endif 154 cred = rpc_lookup_machine_cred(); 155 if (!IS_ERR(cred)) 156 clp->cl_machine_cred = cred; 157 158 nfs_fscache_get_client_cookie(clp); 159 160 return clp; 161 162 error_3: 163 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 164 nfs_callback_down(); 165 error_2: 166 kfree(clp); 167 error_0: 168 return NULL; 169 } 170 171 static void nfs4_shutdown_client(struct nfs_client *clp) 172 { 173 #ifdef CONFIG_NFS_V4 174 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 175 nfs4_kill_renewd(clp); 176 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners)); 177 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 178 nfs_idmap_delete(clp); 179 180 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 181 #endif 182 } 183 184 /* 185 * Destroy a shared client record 186 */ 187 static void nfs_free_client(struct nfs_client *clp) 188 { 189 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 190 191 nfs4_shutdown_client(clp); 192 193 nfs_fscache_release_client_cookie(clp); 194 195 /* -EIO all pending I/O */ 196 if (!IS_ERR(clp->cl_rpcclient)) 197 rpc_shutdown_client(clp->cl_rpcclient); 198 199 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 200 nfs_callback_down(); 201 202 if (clp->cl_machine_cred != NULL) 203 put_rpccred(clp->cl_machine_cred); 204 205 kfree(clp->cl_hostname); 206 kfree(clp); 207 208 dprintk("<-- nfs_free_client()\n"); 209 } 210 211 /* 212 * Release a reference to a shared client record 213 */ 214 void nfs_put_client(struct nfs_client *clp) 215 { 216 if (!clp) 217 return; 218 219 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 220 221 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 222 list_del(&clp->cl_share_link); 223 spin_unlock(&nfs_client_lock); 224 225 BUG_ON(!list_empty(&clp->cl_superblocks)); 226 227 nfs_free_client(clp); 228 } 229 } 230 231 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 232 /* 233 * Test if two ip6 socket addresses refer to the same socket by 234 * comparing relevant fields. The padding bytes specifically, are not 235 * compared. sin6_flowinfo is not compared because it only affects QoS 236 * and sin6_scope_id is only compared if the address is "link local" 237 * because "link local" addresses need only be unique to a specific 238 * link. Conversely, ordinary unicast addresses might have different 239 * sin6_scope_id. 240 * 241 * The caller should ensure both socket addresses are AF_INET6. 242 */ 243 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 244 const struct sockaddr *sa2) 245 { 246 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 247 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 248 249 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 250 sin1->sin6_scope_id != sin2->sin6_scope_id) 251 return 0; 252 253 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); 254 } 255 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 256 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 257 const struct sockaddr *sa2) 258 { 259 return 0; 260 } 261 #endif 262 263 /* 264 * Test if two ip4 socket addresses refer to the same socket, by 265 * comparing relevant fields. The padding bytes specifically, are 266 * not compared. 267 * 268 * The caller should ensure both socket addresses are AF_INET. 269 */ 270 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 271 const struct sockaddr *sa2) 272 { 273 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 274 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 275 276 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 277 } 278 279 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 280 const struct sockaddr *sa2) 281 { 282 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 283 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 284 285 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 286 (sin1->sin6_port == sin2->sin6_port); 287 } 288 289 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 290 const struct sockaddr *sa2) 291 { 292 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 293 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 294 295 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 296 (sin1->sin_port == sin2->sin_port); 297 } 298 299 /* 300 * Test if two socket addresses represent the same actual socket, 301 * by comparing (only) relevant fields, excluding the port number. 302 */ 303 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 304 const struct sockaddr *sa2) 305 { 306 if (sa1->sa_family != sa2->sa_family) 307 return 0; 308 309 switch (sa1->sa_family) { 310 case AF_INET: 311 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 312 case AF_INET6: 313 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 314 } 315 return 0; 316 } 317 318 /* 319 * Test if two socket addresses represent the same actual socket, 320 * by comparing (only) relevant fields, including the port number. 321 */ 322 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 323 const struct sockaddr *sa2) 324 { 325 if (sa1->sa_family != sa2->sa_family) 326 return 0; 327 328 switch (sa1->sa_family) { 329 case AF_INET: 330 return nfs_sockaddr_cmp_ip4(sa1, sa2); 331 case AF_INET6: 332 return nfs_sockaddr_cmp_ip6(sa1, sa2); 333 } 334 return 0; 335 } 336 337 /* 338 * Find a client by IP address and protocol version 339 * - returns NULL if no such client 340 */ 341 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 342 { 343 struct nfs_client *clp; 344 345 spin_lock(&nfs_client_lock); 346 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 347 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 348 349 /* Don't match clients that failed to initialise properly */ 350 if (clp->cl_cons_state != NFS_CS_READY) 351 continue; 352 353 /* Different NFS versions cannot share the same nfs_client */ 354 if (clp->rpc_ops->version != nfsversion) 355 continue; 356 357 /* Match only the IP address, not the port number */ 358 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 359 continue; 360 361 atomic_inc(&clp->cl_count); 362 spin_unlock(&nfs_client_lock); 363 return clp; 364 } 365 spin_unlock(&nfs_client_lock); 366 return NULL; 367 } 368 369 /* 370 * Find a client by IP address and protocol version 371 * - returns NULL if no such client 372 */ 373 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 374 { 375 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 376 u32 nfsvers = clp->rpc_ops->version; 377 378 spin_lock(&nfs_client_lock); 379 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 380 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 381 382 /* Don't match clients that failed to initialise properly */ 383 if (clp->cl_cons_state != NFS_CS_READY) 384 continue; 385 386 /* Different NFS versions cannot share the same nfs_client */ 387 if (clp->rpc_ops->version != nfsvers) 388 continue; 389 390 /* Match only the IP address, not the port number */ 391 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 392 continue; 393 394 atomic_inc(&clp->cl_count); 395 spin_unlock(&nfs_client_lock); 396 return clp; 397 } 398 spin_unlock(&nfs_client_lock); 399 return NULL; 400 } 401 402 /* 403 * Find an nfs_client on the list that matches the initialisation data 404 * that is supplied. 405 */ 406 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 407 { 408 struct nfs_client *clp; 409 const struct sockaddr *sap = data->addr; 410 411 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 412 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 413 /* Don't match clients that failed to initialise properly */ 414 if (clp->cl_cons_state < 0) 415 continue; 416 417 /* Different NFS versions cannot share the same nfs_client */ 418 if (clp->rpc_ops != data->rpc_ops) 419 continue; 420 421 if (clp->cl_proto != data->proto) 422 continue; 423 424 /* 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 /* 435 * Look up a client by IP address and protocol version 436 * - creates a new record if one doesn't yet exist 437 */ 438 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 439 { 440 struct nfs_client *clp, *new = NULL; 441 int error; 442 443 dprintk("--> nfs_get_client(%s,v%u)\n", 444 cl_init->hostname ?: "", cl_init->rpc_ops->version); 445 446 /* see if the client already exists */ 447 do { 448 spin_lock(&nfs_client_lock); 449 450 clp = nfs_match_client(cl_init); 451 if (clp) 452 goto found_client; 453 if (new) 454 goto install_client; 455 456 spin_unlock(&nfs_client_lock); 457 458 new = nfs_alloc_client(cl_init); 459 } while (new); 460 461 return ERR_PTR(-ENOMEM); 462 463 /* install a new client and return with it unready */ 464 install_client: 465 clp = new; 466 list_add(&clp->cl_share_link, &nfs_client_list); 467 spin_unlock(&nfs_client_lock); 468 dprintk("--> nfs_get_client() = %p [new]\n", clp); 469 return clp; 470 471 /* found an existing client 472 * - make sure it's ready before returning 473 */ 474 found_client: 475 spin_unlock(&nfs_client_lock); 476 477 if (new) 478 nfs_free_client(new); 479 480 error = wait_event_killable(nfs_client_active_wq, 481 clp->cl_cons_state != NFS_CS_INITING); 482 if (error < 0) { 483 nfs_put_client(clp); 484 return ERR_PTR(-ERESTARTSYS); 485 } 486 487 if (clp->cl_cons_state < NFS_CS_READY) { 488 error = clp->cl_cons_state; 489 nfs_put_client(clp); 490 return ERR_PTR(error); 491 } 492 493 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 494 495 dprintk("--> nfs_get_client() = %p [share]\n", clp); 496 return clp; 497 } 498 499 /* 500 * Mark a server as ready or failed 501 */ 502 static void nfs_mark_client_ready(struct nfs_client *clp, int state) 503 { 504 clp->cl_cons_state = state; 505 wake_up_all(&nfs_client_active_wq); 506 } 507 508 /* 509 * Initialise the timeout values for a connection 510 */ 511 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 512 unsigned int timeo, unsigned int retrans) 513 { 514 to->to_initval = timeo * HZ / 10; 515 to->to_retries = retrans; 516 517 switch (proto) { 518 case XPRT_TRANSPORT_TCP: 519 case XPRT_TRANSPORT_RDMA: 520 if (to->to_retries == 0) 521 to->to_retries = NFS_DEF_TCP_RETRANS; 522 if (to->to_initval == 0) 523 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 524 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 525 to->to_initval = NFS_MAX_TCP_TIMEOUT; 526 to->to_increment = to->to_initval; 527 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 528 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 529 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 530 if (to->to_maxval < to->to_initval) 531 to->to_maxval = to->to_initval; 532 to->to_exponential = 0; 533 break; 534 case XPRT_TRANSPORT_UDP: 535 if (to->to_retries == 0) 536 to->to_retries = NFS_DEF_UDP_RETRANS; 537 if (!to->to_initval) 538 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 539 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 540 to->to_initval = NFS_MAX_UDP_TIMEOUT; 541 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 542 to->to_exponential = 1; 543 break; 544 default: 545 BUG(); 546 } 547 } 548 549 /* 550 * Create an RPC client handle 551 */ 552 static int nfs_create_rpc_client(struct nfs_client *clp, 553 const struct rpc_timeout *timeparms, 554 rpc_authflavor_t flavor, 555 int discrtry, int noresvport) 556 { 557 struct rpc_clnt *clnt = NULL; 558 struct rpc_create_args args = { 559 .protocol = clp->cl_proto, 560 .address = (struct sockaddr *)&clp->cl_addr, 561 .addrsize = clp->cl_addrlen, 562 .timeout = timeparms, 563 .servername = clp->cl_hostname, 564 .program = &nfs_program, 565 .version = clp->rpc_ops->version, 566 .authflavor = flavor, 567 }; 568 569 if (discrtry) 570 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 571 if (noresvport) 572 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 573 574 if (!IS_ERR(clp->cl_rpcclient)) 575 return 0; 576 577 clnt = rpc_create(&args); 578 if (IS_ERR(clnt)) { 579 dprintk("%s: cannot create RPC client. Error = %ld\n", 580 __func__, PTR_ERR(clnt)); 581 return PTR_ERR(clnt); 582 } 583 584 clp->cl_rpcclient = clnt; 585 return 0; 586 } 587 588 /* 589 * Version 2 or 3 client destruction 590 */ 591 static void nfs_destroy_server(struct nfs_server *server) 592 { 593 if (!(server->flags & NFS_MOUNT_NONLM)) 594 nlmclnt_done(server->nlm_host); 595 } 596 597 /* 598 * Version 2 or 3 lockd setup 599 */ 600 static int nfs_start_lockd(struct nfs_server *server) 601 { 602 struct nlm_host *host; 603 struct nfs_client *clp = server->nfs_client; 604 struct nlmclnt_initdata nlm_init = { 605 .hostname = clp->cl_hostname, 606 .address = (struct sockaddr *)&clp->cl_addr, 607 .addrlen = clp->cl_addrlen, 608 .protocol = server->flags & NFS_MOUNT_TCP ? 609 IPPROTO_TCP : IPPROTO_UDP, 610 .nfs_version = clp->rpc_ops->version, 611 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 612 1 : 0, 613 }; 614 615 if (nlm_init.nfs_version > 3) 616 return 0; 617 if (server->flags & NFS_MOUNT_NONLM) 618 return 0; 619 620 host = nlmclnt_init(&nlm_init); 621 if (IS_ERR(host)) 622 return PTR_ERR(host); 623 624 server->nlm_host = host; 625 server->destroy = nfs_destroy_server; 626 return 0; 627 } 628 629 /* 630 * Initialise an NFSv3 ACL client connection 631 */ 632 #ifdef CONFIG_NFS_V3_ACL 633 static void nfs_init_server_aclclient(struct nfs_server *server) 634 { 635 if (server->nfs_client->rpc_ops->version != 3) 636 goto out_noacl; 637 if (server->flags & NFS_MOUNT_NOACL) 638 goto out_noacl; 639 640 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 641 if (IS_ERR(server->client_acl)) 642 goto out_noacl; 643 644 /* No errors! Assume that Sun nfsacls are supported */ 645 server->caps |= NFS_CAP_ACLS; 646 return; 647 648 out_noacl: 649 server->caps &= ~NFS_CAP_ACLS; 650 } 651 #else 652 static inline void nfs_init_server_aclclient(struct nfs_server *server) 653 { 654 server->flags &= ~NFS_MOUNT_NOACL; 655 server->caps &= ~NFS_CAP_ACLS; 656 } 657 #endif 658 659 /* 660 * Create a general RPC client 661 */ 662 static int nfs_init_server_rpcclient(struct nfs_server *server, 663 const struct rpc_timeout *timeo, 664 rpc_authflavor_t pseudoflavour) 665 { 666 struct nfs_client *clp = server->nfs_client; 667 668 server->client = rpc_clone_client(clp->cl_rpcclient); 669 if (IS_ERR(server->client)) { 670 dprintk("%s: couldn't create rpc_client!\n", __func__); 671 return PTR_ERR(server->client); 672 } 673 674 memcpy(&server->client->cl_timeout_default, 675 timeo, 676 sizeof(server->client->cl_timeout_default)); 677 server->client->cl_timeout = &server->client->cl_timeout_default; 678 679 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 680 struct rpc_auth *auth; 681 682 auth = rpcauth_create(pseudoflavour, server->client); 683 if (IS_ERR(auth)) { 684 dprintk("%s: couldn't create credcache!\n", __func__); 685 return PTR_ERR(auth); 686 } 687 } 688 server->client->cl_softrtry = 0; 689 if (server->flags & NFS_MOUNT_SOFT) 690 server->client->cl_softrtry = 1; 691 692 return 0; 693 } 694 695 /* 696 * Initialise an NFS2 or NFS3 client 697 */ 698 static int nfs_init_client(struct nfs_client *clp, 699 const struct rpc_timeout *timeparms, 700 const struct nfs_parsed_mount_data *data) 701 { 702 int error; 703 704 if (clp->cl_cons_state == NFS_CS_READY) { 705 /* the client is already initialised */ 706 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 707 return 0; 708 } 709 710 /* 711 * Create a client RPC handle for doing FSSTAT with UNIX auth only 712 * - RFC 2623, sec 2.3.2 713 */ 714 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 715 0, data->flags & NFS_MOUNT_NORESVPORT); 716 if (error < 0) 717 goto error; 718 nfs_mark_client_ready(clp, NFS_CS_READY); 719 return 0; 720 721 error: 722 nfs_mark_client_ready(clp, error); 723 dprintk("<-- nfs_init_client() = xerror %d\n", error); 724 return error; 725 } 726 727 /* 728 * Create a version 2 or 3 client 729 */ 730 static int nfs_init_server(struct nfs_server *server, 731 const struct nfs_parsed_mount_data *data) 732 { 733 struct nfs_client_initdata cl_init = { 734 .hostname = data->nfs_server.hostname, 735 .addr = (const struct sockaddr *)&data->nfs_server.address, 736 .addrlen = data->nfs_server.addrlen, 737 .rpc_ops = &nfs_v2_clientops, 738 .proto = data->nfs_server.protocol, 739 }; 740 struct rpc_timeout timeparms; 741 struct nfs_client *clp; 742 int error; 743 744 dprintk("--> nfs_init_server()\n"); 745 746 #ifdef CONFIG_NFS_V3 747 if (data->flags & NFS_MOUNT_VER3) 748 cl_init.rpc_ops = &nfs_v3_clientops; 749 #endif 750 751 /* Allocate or find a client reference we can use */ 752 clp = nfs_get_client(&cl_init); 753 if (IS_ERR(clp)) { 754 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 755 return PTR_ERR(clp); 756 } 757 758 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 759 data->timeo, data->retrans); 760 error = nfs_init_client(clp, &timeparms, data); 761 if (error < 0) 762 goto error; 763 764 server->nfs_client = clp; 765 766 /* Initialise the client representation from the mount data */ 767 server->flags = data->flags; 768 server->options = data->options; 769 770 if (data->rsize) 771 server->rsize = nfs_block_size(data->rsize, NULL); 772 if (data->wsize) 773 server->wsize = nfs_block_size(data->wsize, NULL); 774 775 server->acregmin = data->acregmin * HZ; 776 server->acregmax = data->acregmax * HZ; 777 server->acdirmin = data->acdirmin * HZ; 778 server->acdirmax = data->acdirmax * HZ; 779 780 /* Start lockd here, before we might error out */ 781 error = nfs_start_lockd(server); 782 if (error < 0) 783 goto error; 784 785 server->port = data->nfs_server.port; 786 787 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 788 if (error < 0) 789 goto error; 790 791 /* Preserve the values of mount_server-related mount options */ 792 if (data->mount_server.addrlen) { 793 memcpy(&server->mountd_address, &data->mount_server.address, 794 data->mount_server.addrlen); 795 server->mountd_addrlen = data->mount_server.addrlen; 796 } 797 server->mountd_version = data->mount_server.version; 798 server->mountd_port = data->mount_server.port; 799 server->mountd_protocol = data->mount_server.protocol; 800 801 server->namelen = data->namlen; 802 /* Create a client RPC handle for the NFSv3 ACL management interface */ 803 nfs_init_server_aclclient(server); 804 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 805 return 0; 806 807 error: 808 server->nfs_client = NULL; 809 nfs_put_client(clp); 810 dprintk("<-- nfs_init_server() = xerror %d\n", error); 811 return error; 812 } 813 814 /* 815 * Load up the server record from information gained in an fsinfo record 816 */ 817 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 818 { 819 unsigned long max_rpc_payload; 820 821 /* Work out a lot of parameters */ 822 if (server->rsize == 0) 823 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 824 if (server->wsize == 0) 825 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 826 827 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 828 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 829 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 830 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 831 832 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 833 if (server->rsize > max_rpc_payload) 834 server->rsize = max_rpc_payload; 835 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 836 server->rsize = NFS_MAX_FILE_IO_SIZE; 837 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 838 839 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 840 841 if (server->wsize > max_rpc_payload) 842 server->wsize = max_rpc_payload; 843 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 844 server->wsize = NFS_MAX_FILE_IO_SIZE; 845 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 846 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 847 848 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 849 if (server->dtsize > PAGE_CACHE_SIZE) 850 server->dtsize = PAGE_CACHE_SIZE; 851 if (server->dtsize > server->rsize) 852 server->dtsize = server->rsize; 853 854 if (server->flags & NFS_MOUNT_NOAC) { 855 server->acregmin = server->acregmax = 0; 856 server->acdirmin = server->acdirmax = 0; 857 } 858 859 server->maxfilesize = fsinfo->maxfilesize; 860 861 /* We're airborne Set socket buffersize */ 862 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 863 } 864 865 /* 866 * Probe filesystem information, including the FSID on v2/v3 867 */ 868 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 869 { 870 struct nfs_fsinfo fsinfo; 871 struct nfs_client *clp = server->nfs_client; 872 int error; 873 874 dprintk("--> nfs_probe_fsinfo()\n"); 875 876 if (clp->rpc_ops->set_capabilities != NULL) { 877 error = clp->rpc_ops->set_capabilities(server, mntfh); 878 if (error < 0) 879 goto out_error; 880 } 881 882 fsinfo.fattr = fattr; 883 nfs_fattr_init(fattr); 884 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 885 if (error < 0) 886 goto out_error; 887 888 nfs_server_set_fsinfo(server, &fsinfo); 889 error = bdi_init(&server->backing_dev_info); 890 if (error) 891 goto out_error; 892 893 894 /* Get some general file system info */ 895 if (server->namelen == 0) { 896 struct nfs_pathconf pathinfo; 897 898 pathinfo.fattr = fattr; 899 nfs_fattr_init(fattr); 900 901 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 902 server->namelen = pathinfo.max_namelen; 903 } 904 905 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 906 return 0; 907 908 out_error: 909 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 910 return error; 911 } 912 913 /* 914 * Copy useful information when duplicating a server record 915 */ 916 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 917 { 918 target->flags = source->flags; 919 target->acregmin = source->acregmin; 920 target->acregmax = source->acregmax; 921 target->acdirmin = source->acdirmin; 922 target->acdirmax = source->acdirmax; 923 target->caps = source->caps; 924 } 925 926 /* 927 * Allocate and initialise a server record 928 */ 929 static struct nfs_server *nfs_alloc_server(void) 930 { 931 struct nfs_server *server; 932 933 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 934 if (!server) 935 return NULL; 936 937 server->client = server->client_acl = ERR_PTR(-EINVAL); 938 939 /* Zero out the NFS state stuff */ 940 INIT_LIST_HEAD(&server->client_link); 941 INIT_LIST_HEAD(&server->master_link); 942 943 atomic_set(&server->active, 0); 944 945 server->io_stats = nfs_alloc_iostats(); 946 if (!server->io_stats) { 947 kfree(server); 948 return NULL; 949 } 950 951 return server; 952 } 953 954 /* 955 * Free up a server record 956 */ 957 void nfs_free_server(struct nfs_server *server) 958 { 959 dprintk("--> nfs_free_server()\n"); 960 961 spin_lock(&nfs_client_lock); 962 list_del(&server->client_link); 963 list_del(&server->master_link); 964 spin_unlock(&nfs_client_lock); 965 966 if (server->destroy != NULL) 967 server->destroy(server); 968 969 if (!IS_ERR(server->client_acl)) 970 rpc_shutdown_client(server->client_acl); 971 if (!IS_ERR(server->client)) 972 rpc_shutdown_client(server->client); 973 974 nfs_put_client(server->nfs_client); 975 976 nfs_free_iostats(server->io_stats); 977 bdi_destroy(&server->backing_dev_info); 978 kfree(server); 979 nfs_release_automount_timer(); 980 dprintk("<-- nfs_free_server()\n"); 981 } 982 983 /* 984 * Create a version 2 or 3 volume record 985 * - keyed on server and FSID 986 */ 987 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 988 struct nfs_fh *mntfh) 989 { 990 struct nfs_server *server; 991 struct nfs_fattr fattr; 992 int error; 993 994 server = nfs_alloc_server(); 995 if (!server) 996 return ERR_PTR(-ENOMEM); 997 998 /* Get a client representation */ 999 error = nfs_init_server(server, data); 1000 if (error < 0) 1001 goto error; 1002 1003 BUG_ON(!server->nfs_client); 1004 BUG_ON(!server->nfs_client->rpc_ops); 1005 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1006 1007 /* Probe the root fh to retrieve its FSID */ 1008 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1009 if (error < 0) 1010 goto error; 1011 if (server->nfs_client->rpc_ops->version == 3) { 1012 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1013 server->namelen = NFS3_MAXNAMLEN; 1014 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1015 server->caps |= NFS_CAP_READDIRPLUS; 1016 } else { 1017 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1018 server->namelen = NFS2_MAXNAMLEN; 1019 } 1020 1021 if (!(fattr.valid & NFS_ATTR_FATTR)) { 1022 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 1023 if (error < 0) { 1024 dprintk("nfs_create_server: getattr error = %d\n", -error); 1025 goto error; 1026 } 1027 } 1028 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 1029 1030 dprintk("Server FSID: %llx:%llx\n", 1031 (unsigned long long) server->fsid.major, 1032 (unsigned long long) server->fsid.minor); 1033 1034 BUG_ON(!server->nfs_client); 1035 BUG_ON(!server->nfs_client->rpc_ops); 1036 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1037 1038 spin_lock(&nfs_client_lock); 1039 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1040 list_add_tail(&server->master_link, &nfs_volume_list); 1041 spin_unlock(&nfs_client_lock); 1042 1043 server->mount_time = jiffies; 1044 return server; 1045 1046 error: 1047 nfs_free_server(server); 1048 return ERR_PTR(error); 1049 } 1050 1051 #ifdef CONFIG_NFS_V4 1052 /* 1053 * Initialise an NFS4 client record 1054 */ 1055 static int nfs4_init_client(struct nfs_client *clp, 1056 const struct rpc_timeout *timeparms, 1057 const char *ip_addr, 1058 rpc_authflavor_t authflavour, 1059 int flags) 1060 { 1061 int error; 1062 1063 if (clp->cl_cons_state == NFS_CS_READY) { 1064 /* the client is initialised already */ 1065 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1066 return 0; 1067 } 1068 1069 /* Check NFS protocol revision and initialize RPC op vector */ 1070 clp->rpc_ops = &nfs_v4_clientops; 1071 1072 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1073 1, flags & NFS_MOUNT_NORESVPORT); 1074 if (error < 0) 1075 goto error; 1076 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1077 1078 error = nfs_idmap_new(clp); 1079 if (error < 0) { 1080 dprintk("%s: failed to create idmapper. Error = %d\n", 1081 __func__, error); 1082 goto error; 1083 } 1084 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1085 1086 nfs_mark_client_ready(clp, NFS_CS_READY); 1087 return 0; 1088 1089 error: 1090 nfs_mark_client_ready(clp, error); 1091 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1092 return error; 1093 } 1094 1095 /* 1096 * Set up an NFS4 client 1097 */ 1098 static int nfs4_set_client(struct nfs_server *server, 1099 const char *hostname, 1100 const struct sockaddr *addr, 1101 const size_t addrlen, 1102 const char *ip_addr, 1103 rpc_authflavor_t authflavour, 1104 int proto, const struct rpc_timeout *timeparms) 1105 { 1106 struct nfs_client_initdata cl_init = { 1107 .hostname = hostname, 1108 .addr = addr, 1109 .addrlen = addrlen, 1110 .rpc_ops = &nfs_v4_clientops, 1111 .proto = proto, 1112 }; 1113 struct nfs_client *clp; 1114 int error; 1115 1116 dprintk("--> nfs4_set_client()\n"); 1117 1118 /* Allocate or find a client reference we can use */ 1119 clp = nfs_get_client(&cl_init); 1120 if (IS_ERR(clp)) { 1121 error = PTR_ERR(clp); 1122 goto error; 1123 } 1124 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1125 server->flags); 1126 if (error < 0) 1127 goto error_put; 1128 1129 server->nfs_client = clp; 1130 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1131 return 0; 1132 1133 error_put: 1134 nfs_put_client(clp); 1135 error: 1136 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1137 return error; 1138 } 1139 1140 /* 1141 * Create a version 4 volume record 1142 */ 1143 static int nfs4_init_server(struct nfs_server *server, 1144 const struct nfs_parsed_mount_data *data) 1145 { 1146 struct rpc_timeout timeparms; 1147 int error; 1148 1149 dprintk("--> nfs4_init_server()\n"); 1150 1151 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1152 data->timeo, data->retrans); 1153 1154 /* Initialise the client representation from the mount data */ 1155 server->flags = data->flags; 1156 server->caps |= NFS_CAP_ATOMIC_OPEN; 1157 server->options = data->options; 1158 1159 /* Get a client record */ 1160 error = nfs4_set_client(server, 1161 data->nfs_server.hostname, 1162 (const struct sockaddr *)&data->nfs_server.address, 1163 data->nfs_server.addrlen, 1164 data->client_address, 1165 data->auth_flavors[0], 1166 data->nfs_server.protocol, 1167 &timeparms); 1168 if (error < 0) 1169 goto error; 1170 1171 if (data->rsize) 1172 server->rsize = nfs_block_size(data->rsize, NULL); 1173 if (data->wsize) 1174 server->wsize = nfs_block_size(data->wsize, NULL); 1175 1176 server->acregmin = data->acregmin * HZ; 1177 server->acregmax = data->acregmax * HZ; 1178 server->acdirmin = data->acdirmin * HZ; 1179 server->acdirmax = data->acdirmax * HZ; 1180 1181 server->port = data->nfs_server.port; 1182 1183 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1184 1185 error: 1186 /* Done */ 1187 dprintk("<-- nfs4_init_server() = %d\n", error); 1188 return error; 1189 } 1190 1191 /* 1192 * Create a version 4 volume record 1193 * - keyed on server and FSID 1194 */ 1195 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1196 struct nfs_fh *mntfh) 1197 { 1198 struct nfs_fattr fattr; 1199 struct nfs_server *server; 1200 int error; 1201 1202 dprintk("--> nfs4_create_server()\n"); 1203 1204 server = nfs_alloc_server(); 1205 if (!server) 1206 return ERR_PTR(-ENOMEM); 1207 1208 /* set up the general RPC client */ 1209 error = nfs4_init_server(server, data); 1210 if (error < 0) 1211 goto error; 1212 1213 BUG_ON(!server->nfs_client); 1214 BUG_ON(!server->nfs_client->rpc_ops); 1215 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1216 1217 /* Probe the root fh to retrieve its FSID */ 1218 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1219 if (error < 0) 1220 goto error; 1221 1222 dprintk("Server FSID: %llx:%llx\n", 1223 (unsigned long long) server->fsid.major, 1224 (unsigned long long) server->fsid.minor); 1225 dprintk("Mount FH: %d\n", mntfh->size); 1226 1227 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1228 if (error < 0) 1229 goto error; 1230 1231 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1232 server->namelen = NFS4_MAXNAMLEN; 1233 1234 BUG_ON(!server->nfs_client); 1235 BUG_ON(!server->nfs_client->rpc_ops); 1236 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1237 1238 spin_lock(&nfs_client_lock); 1239 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1240 list_add_tail(&server->master_link, &nfs_volume_list); 1241 spin_unlock(&nfs_client_lock); 1242 1243 server->mount_time = jiffies; 1244 dprintk("<-- nfs4_create_server() = %p\n", server); 1245 return server; 1246 1247 error: 1248 nfs_free_server(server); 1249 dprintk("<-- nfs4_create_server() = error %d\n", error); 1250 return ERR_PTR(error); 1251 } 1252 1253 /* 1254 * Create an NFS4 referral server record 1255 */ 1256 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1257 struct nfs_fh *mntfh) 1258 { 1259 struct nfs_client *parent_client; 1260 struct nfs_server *server, *parent_server; 1261 struct nfs_fattr fattr; 1262 int error; 1263 1264 dprintk("--> nfs4_create_referral_server()\n"); 1265 1266 server = nfs_alloc_server(); 1267 if (!server) 1268 return ERR_PTR(-ENOMEM); 1269 1270 parent_server = NFS_SB(data->sb); 1271 parent_client = parent_server->nfs_client; 1272 1273 /* Initialise the client representation from the parent server */ 1274 nfs_server_copy_userdata(server, parent_server); 1275 server->caps |= NFS_CAP_ATOMIC_OPEN; 1276 1277 /* Get a client representation. 1278 * Note: NFSv4 always uses TCP, */ 1279 error = nfs4_set_client(server, data->hostname, 1280 data->addr, 1281 data->addrlen, 1282 parent_client->cl_ipaddr, 1283 data->authflavor, 1284 parent_server->client->cl_xprt->prot, 1285 parent_server->client->cl_timeout); 1286 if (error < 0) 1287 goto error; 1288 1289 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1290 if (error < 0) 1291 goto error; 1292 1293 BUG_ON(!server->nfs_client); 1294 BUG_ON(!server->nfs_client->rpc_ops); 1295 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1296 1297 /* Probe the root fh to retrieve its FSID and filehandle */ 1298 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1299 if (error < 0) 1300 goto error; 1301 1302 /* probe the filesystem info for this server filesystem */ 1303 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1304 if (error < 0) 1305 goto error; 1306 1307 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1308 server->namelen = NFS4_MAXNAMLEN; 1309 1310 dprintk("Referral FSID: %llx:%llx\n", 1311 (unsigned long long) server->fsid.major, 1312 (unsigned long long) server->fsid.minor); 1313 1314 spin_lock(&nfs_client_lock); 1315 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1316 list_add_tail(&server->master_link, &nfs_volume_list); 1317 spin_unlock(&nfs_client_lock); 1318 1319 server->mount_time = jiffies; 1320 1321 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1322 return server; 1323 1324 error: 1325 nfs_free_server(server); 1326 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1327 return ERR_PTR(error); 1328 } 1329 1330 #endif /* CONFIG_NFS_V4 */ 1331 1332 /* 1333 * Clone an NFS2, NFS3 or NFS4 server record 1334 */ 1335 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1336 struct nfs_fh *fh, 1337 struct nfs_fattr *fattr) 1338 { 1339 struct nfs_server *server; 1340 struct nfs_fattr fattr_fsinfo; 1341 int error; 1342 1343 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1344 (unsigned long long) fattr->fsid.major, 1345 (unsigned long long) fattr->fsid.minor); 1346 1347 server = nfs_alloc_server(); 1348 if (!server) 1349 return ERR_PTR(-ENOMEM); 1350 1351 /* Copy data from the source */ 1352 server->nfs_client = source->nfs_client; 1353 atomic_inc(&server->nfs_client->cl_count); 1354 nfs_server_copy_userdata(server, source); 1355 1356 server->fsid = fattr->fsid; 1357 1358 error = nfs_init_server_rpcclient(server, 1359 source->client->cl_timeout, 1360 source->client->cl_auth->au_flavor); 1361 if (error < 0) 1362 goto out_free_server; 1363 if (!IS_ERR(source->client_acl)) 1364 nfs_init_server_aclclient(server); 1365 1366 /* probe the filesystem info for this server filesystem */ 1367 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1368 if (error < 0) 1369 goto out_free_server; 1370 1371 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1372 server->namelen = NFS4_MAXNAMLEN; 1373 1374 dprintk("Cloned FSID: %llx:%llx\n", 1375 (unsigned long long) server->fsid.major, 1376 (unsigned long long) server->fsid.minor); 1377 1378 error = nfs_start_lockd(server); 1379 if (error < 0) 1380 goto out_free_server; 1381 1382 spin_lock(&nfs_client_lock); 1383 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1384 list_add_tail(&server->master_link, &nfs_volume_list); 1385 spin_unlock(&nfs_client_lock); 1386 1387 server->mount_time = jiffies; 1388 1389 dprintk("<-- nfs_clone_server() = %p\n", server); 1390 return server; 1391 1392 out_free_server: 1393 nfs_free_server(server); 1394 dprintk("<-- nfs_clone_server() = error %d\n", error); 1395 return ERR_PTR(error); 1396 } 1397 1398 #ifdef CONFIG_PROC_FS 1399 static struct proc_dir_entry *proc_fs_nfs; 1400 1401 static int nfs_server_list_open(struct inode *inode, struct file *file); 1402 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1403 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1404 static void nfs_server_list_stop(struct seq_file *p, void *v); 1405 static int nfs_server_list_show(struct seq_file *m, void *v); 1406 1407 static struct seq_operations nfs_server_list_ops = { 1408 .start = nfs_server_list_start, 1409 .next = nfs_server_list_next, 1410 .stop = nfs_server_list_stop, 1411 .show = nfs_server_list_show, 1412 }; 1413 1414 static const struct file_operations nfs_server_list_fops = { 1415 .open = nfs_server_list_open, 1416 .read = seq_read, 1417 .llseek = seq_lseek, 1418 .release = seq_release, 1419 .owner = THIS_MODULE, 1420 }; 1421 1422 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1423 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1424 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1425 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1426 static int nfs_volume_list_show(struct seq_file *m, void *v); 1427 1428 static struct seq_operations nfs_volume_list_ops = { 1429 .start = nfs_volume_list_start, 1430 .next = nfs_volume_list_next, 1431 .stop = nfs_volume_list_stop, 1432 .show = nfs_volume_list_show, 1433 }; 1434 1435 static const struct file_operations nfs_volume_list_fops = { 1436 .open = nfs_volume_list_open, 1437 .read = seq_read, 1438 .llseek = seq_lseek, 1439 .release = seq_release, 1440 .owner = THIS_MODULE, 1441 }; 1442 1443 /* 1444 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1445 * we're dealing 1446 */ 1447 static int nfs_server_list_open(struct inode *inode, struct file *file) 1448 { 1449 struct seq_file *m; 1450 int ret; 1451 1452 ret = seq_open(file, &nfs_server_list_ops); 1453 if (ret < 0) 1454 return ret; 1455 1456 m = file->private_data; 1457 m->private = PDE(inode)->data; 1458 1459 return 0; 1460 } 1461 1462 /* 1463 * set up the iterator to start reading from the server list and return the first item 1464 */ 1465 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1466 { 1467 /* lock the list against modification */ 1468 spin_lock(&nfs_client_lock); 1469 return seq_list_start_head(&nfs_client_list, *_pos); 1470 } 1471 1472 /* 1473 * move to next server 1474 */ 1475 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1476 { 1477 return seq_list_next(v, &nfs_client_list, pos); 1478 } 1479 1480 /* 1481 * clean up after reading from the transports list 1482 */ 1483 static void nfs_server_list_stop(struct seq_file *p, void *v) 1484 { 1485 spin_unlock(&nfs_client_lock); 1486 } 1487 1488 /* 1489 * display a header line followed by a load of call lines 1490 */ 1491 static int nfs_server_list_show(struct seq_file *m, void *v) 1492 { 1493 struct nfs_client *clp; 1494 1495 /* display header on line 1 */ 1496 if (v == &nfs_client_list) { 1497 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1498 return 0; 1499 } 1500 1501 /* display one transport per line on subsequent lines */ 1502 clp = list_entry(v, struct nfs_client, cl_share_link); 1503 1504 seq_printf(m, "v%u %s %s %3d %s\n", 1505 clp->rpc_ops->version, 1506 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1507 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1508 atomic_read(&clp->cl_count), 1509 clp->cl_hostname); 1510 1511 return 0; 1512 } 1513 1514 /* 1515 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1516 */ 1517 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1518 { 1519 struct seq_file *m; 1520 int ret; 1521 1522 ret = seq_open(file, &nfs_volume_list_ops); 1523 if (ret < 0) 1524 return ret; 1525 1526 m = file->private_data; 1527 m->private = PDE(inode)->data; 1528 1529 return 0; 1530 } 1531 1532 /* 1533 * set up the iterator to start reading from the volume list and return the first item 1534 */ 1535 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1536 { 1537 /* lock the list against modification */ 1538 spin_lock(&nfs_client_lock); 1539 return seq_list_start_head(&nfs_volume_list, *_pos); 1540 } 1541 1542 /* 1543 * move to next volume 1544 */ 1545 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1546 { 1547 return seq_list_next(v, &nfs_volume_list, pos); 1548 } 1549 1550 /* 1551 * clean up after reading from the transports list 1552 */ 1553 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1554 { 1555 spin_unlock(&nfs_client_lock); 1556 } 1557 1558 /* 1559 * display a header line followed by a load of call lines 1560 */ 1561 static int nfs_volume_list_show(struct seq_file *m, void *v) 1562 { 1563 struct nfs_server *server; 1564 struct nfs_client *clp; 1565 char dev[8], fsid[17]; 1566 1567 /* display header on line 1 */ 1568 if (v == &nfs_volume_list) { 1569 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1570 return 0; 1571 } 1572 /* display one transport per line on subsequent lines */ 1573 server = list_entry(v, struct nfs_server, master_link); 1574 clp = server->nfs_client; 1575 1576 snprintf(dev, 8, "%u:%u", 1577 MAJOR(server->s_dev), MINOR(server->s_dev)); 1578 1579 snprintf(fsid, 17, "%llx:%llx", 1580 (unsigned long long) server->fsid.major, 1581 (unsigned long long) server->fsid.minor); 1582 1583 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1584 clp->rpc_ops->version, 1585 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1586 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1587 dev, 1588 fsid, 1589 nfs_server_fscache_state(server)); 1590 1591 return 0; 1592 } 1593 1594 /* 1595 * initialise the /proc/fs/nfsfs/ directory 1596 */ 1597 int __init nfs_fs_proc_init(void) 1598 { 1599 struct proc_dir_entry *p; 1600 1601 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1602 if (!proc_fs_nfs) 1603 goto error_0; 1604 1605 /* a file of servers with which we're dealing */ 1606 p = proc_create("servers", S_IFREG|S_IRUGO, 1607 proc_fs_nfs, &nfs_server_list_fops); 1608 if (!p) 1609 goto error_1; 1610 1611 /* a file of volumes that we have mounted */ 1612 p = proc_create("volumes", S_IFREG|S_IRUGO, 1613 proc_fs_nfs, &nfs_volume_list_fops); 1614 if (!p) 1615 goto error_2; 1616 return 0; 1617 1618 error_2: 1619 remove_proc_entry("servers", proc_fs_nfs); 1620 error_1: 1621 remove_proc_entry("fs/nfsfs", NULL); 1622 error_0: 1623 return -ENOMEM; 1624 } 1625 1626 /* 1627 * clean up the /proc/fs/nfsfs/ directory 1628 */ 1629 void nfs_fs_proc_exit(void) 1630 { 1631 remove_proc_entry("volumes", proc_fs_nfs); 1632 remove_proc_entry("servers", proc_fs_nfs); 1633 remove_proc_entry("fs/nfsfs", NULL); 1634 } 1635 1636 #endif /* CONFIG_PROC_FS */ 1637