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 static const struct in6_addr *nfs_map_ipv4_addr(const struct sockaddr *sa, struct in6_addr *addr_mapped) 228 { 229 switch (sa->sa_family) { 230 default: 231 return NULL; 232 case AF_INET6: 233 return &((const struct sockaddr_in6 *)sa)->sin6_addr; 234 break; 235 case AF_INET: 236 ipv6_addr_set_v4mapped(((const struct sockaddr_in *)sa)->sin_addr.s_addr, 237 addr_mapped); 238 return addr_mapped; 239 } 240 } 241 242 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 243 const struct sockaddr *sa2) 244 { 245 const struct in6_addr *addr1; 246 const struct in6_addr *addr2; 247 struct in6_addr addr1_mapped; 248 struct in6_addr addr2_mapped; 249 250 addr1 = nfs_map_ipv4_addr(sa1, &addr1_mapped); 251 if (likely(addr1 != NULL)) { 252 addr2 = nfs_map_ipv4_addr(sa2, &addr2_mapped); 253 if (likely(addr2 != NULL)) 254 return ipv6_addr_equal(addr1, addr2); 255 } 256 return 0; 257 } 258 #else 259 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in *sa1, 260 const struct sockaddr_in *sa2) 261 { 262 return sa1->sin_addr.s_addr == sa2->sin_addr.s_addr; 263 } 264 265 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 266 const struct sockaddr *sa2) 267 { 268 if (unlikely(sa1->sa_family != AF_INET || sa2->sa_family != AF_INET)) 269 return 0; 270 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in *)sa1, 271 (const struct sockaddr_in *)sa2); 272 } 273 #endif 274 275 /* 276 * Find a client by IP address and protocol version 277 * - returns NULL if no such client 278 */ 279 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 280 { 281 struct nfs_client *clp; 282 283 spin_lock(&nfs_client_lock); 284 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 285 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 286 287 /* Don't match clients that failed to initialise properly */ 288 if (clp->cl_cons_state != NFS_CS_READY) 289 continue; 290 291 /* Different NFS versions cannot share the same nfs_client */ 292 if (clp->rpc_ops->version != nfsversion) 293 continue; 294 295 /* Match only the IP address, not the port number */ 296 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 297 continue; 298 299 atomic_inc(&clp->cl_count); 300 spin_unlock(&nfs_client_lock); 301 return clp; 302 } 303 spin_unlock(&nfs_client_lock); 304 return NULL; 305 } 306 307 /* 308 * Find a client by IP address and protocol version 309 * - returns NULL if no such client 310 */ 311 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 312 { 313 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 314 u32 nfsvers = clp->rpc_ops->version; 315 316 spin_lock(&nfs_client_lock); 317 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 318 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 319 320 /* Don't match clients that failed to initialise properly */ 321 if (clp->cl_cons_state != NFS_CS_READY) 322 continue; 323 324 /* Different NFS versions cannot share the same nfs_client */ 325 if (clp->rpc_ops->version != nfsvers) 326 continue; 327 328 /* Match only the IP address, not the port number */ 329 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 330 continue; 331 332 atomic_inc(&clp->cl_count); 333 spin_unlock(&nfs_client_lock); 334 return clp; 335 } 336 spin_unlock(&nfs_client_lock); 337 return NULL; 338 } 339 340 /* 341 * Find an nfs_client on the list that matches the initialisation data 342 * that is supplied. 343 */ 344 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 345 { 346 struct nfs_client *clp; 347 348 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 349 /* Don't match clients that failed to initialise properly */ 350 if (clp->cl_cons_state < 0) 351 continue; 352 353 /* Different NFS versions cannot share the same nfs_client */ 354 if (clp->rpc_ops != data->rpc_ops) 355 continue; 356 357 if (clp->cl_proto != data->proto) 358 continue; 359 360 /* Match the full socket address */ 361 if (memcmp(&clp->cl_addr, data->addr, sizeof(clp->cl_addr)) != 0) 362 continue; 363 364 atomic_inc(&clp->cl_count); 365 return clp; 366 } 367 return NULL; 368 } 369 370 /* 371 * Look up a client by IP address and protocol version 372 * - creates a new record if one doesn't yet exist 373 */ 374 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 375 { 376 struct nfs_client *clp, *new = NULL; 377 int error; 378 379 dprintk("--> nfs_get_client(%s,v%u)\n", 380 cl_init->hostname ?: "", cl_init->rpc_ops->version); 381 382 /* see if the client already exists */ 383 do { 384 spin_lock(&nfs_client_lock); 385 386 clp = nfs_match_client(cl_init); 387 if (clp) 388 goto found_client; 389 if (new) 390 goto install_client; 391 392 spin_unlock(&nfs_client_lock); 393 394 new = nfs_alloc_client(cl_init); 395 } while (new); 396 397 return ERR_PTR(-ENOMEM); 398 399 /* install a new client and return with it unready */ 400 install_client: 401 clp = new; 402 list_add(&clp->cl_share_link, &nfs_client_list); 403 spin_unlock(&nfs_client_lock); 404 dprintk("--> nfs_get_client() = %p [new]\n", clp); 405 return clp; 406 407 /* found an existing client 408 * - make sure it's ready before returning 409 */ 410 found_client: 411 spin_unlock(&nfs_client_lock); 412 413 if (new) 414 nfs_free_client(new); 415 416 error = wait_event_killable(nfs_client_active_wq, 417 clp->cl_cons_state != NFS_CS_INITING); 418 if (error < 0) { 419 nfs_put_client(clp); 420 return ERR_PTR(-ERESTARTSYS); 421 } 422 423 if (clp->cl_cons_state < NFS_CS_READY) { 424 error = clp->cl_cons_state; 425 nfs_put_client(clp); 426 return ERR_PTR(error); 427 } 428 429 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 430 431 dprintk("--> nfs_get_client() = %p [share]\n", clp); 432 return clp; 433 } 434 435 /* 436 * Mark a server as ready or failed 437 */ 438 static void nfs_mark_client_ready(struct nfs_client *clp, int state) 439 { 440 clp->cl_cons_state = state; 441 wake_up_all(&nfs_client_active_wq); 442 } 443 444 /* 445 * Initialise the timeout values for a connection 446 */ 447 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 448 unsigned int timeo, unsigned int retrans) 449 { 450 to->to_initval = timeo * HZ / 10; 451 to->to_retries = retrans; 452 453 switch (proto) { 454 case XPRT_TRANSPORT_TCP: 455 case XPRT_TRANSPORT_RDMA: 456 if (to->to_retries == 0) 457 to->to_retries = NFS_DEF_TCP_RETRANS; 458 if (to->to_initval == 0) 459 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 460 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 461 to->to_initval = NFS_MAX_TCP_TIMEOUT; 462 to->to_increment = to->to_initval; 463 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 464 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 465 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 466 if (to->to_maxval < to->to_initval) 467 to->to_maxval = to->to_initval; 468 to->to_exponential = 0; 469 break; 470 case XPRT_TRANSPORT_UDP: 471 if (to->to_retries == 0) 472 to->to_retries = NFS_DEF_UDP_RETRANS; 473 if (!to->to_initval) 474 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 475 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 476 to->to_initval = NFS_MAX_UDP_TIMEOUT; 477 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 478 to->to_exponential = 1; 479 break; 480 default: 481 BUG(); 482 } 483 } 484 485 /* 486 * Create an RPC client handle 487 */ 488 static int nfs_create_rpc_client(struct nfs_client *clp, 489 const struct rpc_timeout *timeparms, 490 rpc_authflavor_t flavor, 491 int discrtry, int noresvport) 492 { 493 struct rpc_clnt *clnt = NULL; 494 struct rpc_create_args args = { 495 .protocol = clp->cl_proto, 496 .address = (struct sockaddr *)&clp->cl_addr, 497 .addrsize = clp->cl_addrlen, 498 .timeout = timeparms, 499 .servername = clp->cl_hostname, 500 .program = &nfs_program, 501 .version = clp->rpc_ops->version, 502 .authflavor = flavor, 503 }; 504 505 if (discrtry) 506 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 507 if (noresvport) 508 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 509 510 if (!IS_ERR(clp->cl_rpcclient)) 511 return 0; 512 513 clnt = rpc_create(&args); 514 if (IS_ERR(clnt)) { 515 dprintk("%s: cannot create RPC client. Error = %ld\n", 516 __func__, PTR_ERR(clnt)); 517 return PTR_ERR(clnt); 518 } 519 520 clp->cl_rpcclient = clnt; 521 return 0; 522 } 523 524 /* 525 * Version 2 or 3 client destruction 526 */ 527 static void nfs_destroy_server(struct nfs_server *server) 528 { 529 if (!(server->flags & NFS_MOUNT_NONLM)) 530 nlmclnt_done(server->nlm_host); 531 } 532 533 /* 534 * Version 2 or 3 lockd setup 535 */ 536 static int nfs_start_lockd(struct nfs_server *server) 537 { 538 struct nlm_host *host; 539 struct nfs_client *clp = server->nfs_client; 540 struct nlmclnt_initdata nlm_init = { 541 .hostname = clp->cl_hostname, 542 .address = (struct sockaddr *)&clp->cl_addr, 543 .addrlen = clp->cl_addrlen, 544 .protocol = server->flags & NFS_MOUNT_TCP ? 545 IPPROTO_TCP : IPPROTO_UDP, 546 .nfs_version = clp->rpc_ops->version, 547 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 548 1 : 0, 549 }; 550 551 if (nlm_init.nfs_version > 3) 552 return 0; 553 if (server->flags & NFS_MOUNT_NONLM) 554 return 0; 555 556 host = nlmclnt_init(&nlm_init); 557 if (IS_ERR(host)) 558 return PTR_ERR(host); 559 560 server->nlm_host = host; 561 server->destroy = nfs_destroy_server; 562 return 0; 563 } 564 565 /* 566 * Initialise an NFSv3 ACL client connection 567 */ 568 #ifdef CONFIG_NFS_V3_ACL 569 static void nfs_init_server_aclclient(struct nfs_server *server) 570 { 571 if (server->nfs_client->rpc_ops->version != 3) 572 goto out_noacl; 573 if (server->flags & NFS_MOUNT_NOACL) 574 goto out_noacl; 575 576 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 577 if (IS_ERR(server->client_acl)) 578 goto out_noacl; 579 580 /* No errors! Assume that Sun nfsacls are supported */ 581 server->caps |= NFS_CAP_ACLS; 582 return; 583 584 out_noacl: 585 server->caps &= ~NFS_CAP_ACLS; 586 } 587 #else 588 static inline void nfs_init_server_aclclient(struct nfs_server *server) 589 { 590 server->flags &= ~NFS_MOUNT_NOACL; 591 server->caps &= ~NFS_CAP_ACLS; 592 } 593 #endif 594 595 /* 596 * Create a general RPC client 597 */ 598 static int nfs_init_server_rpcclient(struct nfs_server *server, 599 const struct rpc_timeout *timeo, 600 rpc_authflavor_t pseudoflavour) 601 { 602 struct nfs_client *clp = server->nfs_client; 603 604 server->client = rpc_clone_client(clp->cl_rpcclient); 605 if (IS_ERR(server->client)) { 606 dprintk("%s: couldn't create rpc_client!\n", __func__); 607 return PTR_ERR(server->client); 608 } 609 610 memcpy(&server->client->cl_timeout_default, 611 timeo, 612 sizeof(server->client->cl_timeout_default)); 613 server->client->cl_timeout = &server->client->cl_timeout_default; 614 615 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 616 struct rpc_auth *auth; 617 618 auth = rpcauth_create(pseudoflavour, server->client); 619 if (IS_ERR(auth)) { 620 dprintk("%s: couldn't create credcache!\n", __func__); 621 return PTR_ERR(auth); 622 } 623 } 624 server->client->cl_softrtry = 0; 625 if (server->flags & NFS_MOUNT_SOFT) 626 server->client->cl_softrtry = 1; 627 628 return 0; 629 } 630 631 /* 632 * Initialise an NFS2 or NFS3 client 633 */ 634 static int nfs_init_client(struct nfs_client *clp, 635 const struct rpc_timeout *timeparms, 636 const struct nfs_parsed_mount_data *data) 637 { 638 int error; 639 640 if (clp->cl_cons_state == NFS_CS_READY) { 641 /* the client is already initialised */ 642 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 643 return 0; 644 } 645 646 /* 647 * Create a client RPC handle for doing FSSTAT with UNIX auth only 648 * - RFC 2623, sec 2.3.2 649 */ 650 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 651 0, data->flags & NFS_MOUNT_NORESVPORT); 652 if (error < 0) 653 goto error; 654 nfs_mark_client_ready(clp, NFS_CS_READY); 655 return 0; 656 657 error: 658 nfs_mark_client_ready(clp, error); 659 dprintk("<-- nfs_init_client() = xerror %d\n", error); 660 return error; 661 } 662 663 /* 664 * Create a version 2 or 3 client 665 */ 666 static int nfs_init_server(struct nfs_server *server, 667 const struct nfs_parsed_mount_data *data) 668 { 669 struct nfs_client_initdata cl_init = { 670 .hostname = data->nfs_server.hostname, 671 .addr = (const struct sockaddr *)&data->nfs_server.address, 672 .addrlen = data->nfs_server.addrlen, 673 .rpc_ops = &nfs_v2_clientops, 674 .proto = data->nfs_server.protocol, 675 }; 676 struct rpc_timeout timeparms; 677 struct nfs_client *clp; 678 int error; 679 680 dprintk("--> nfs_init_server()\n"); 681 682 #ifdef CONFIG_NFS_V3 683 if (data->flags & NFS_MOUNT_VER3) 684 cl_init.rpc_ops = &nfs_v3_clientops; 685 #endif 686 687 /* Allocate or find a client reference we can use */ 688 clp = nfs_get_client(&cl_init); 689 if (IS_ERR(clp)) { 690 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 691 return PTR_ERR(clp); 692 } 693 694 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 695 data->timeo, data->retrans); 696 error = nfs_init_client(clp, &timeparms, data); 697 if (error < 0) 698 goto error; 699 700 server->nfs_client = clp; 701 702 /* Initialise the client representation from the mount data */ 703 server->flags = data->flags; 704 705 if (data->rsize) 706 server->rsize = nfs_block_size(data->rsize, NULL); 707 if (data->wsize) 708 server->wsize = nfs_block_size(data->wsize, NULL); 709 710 server->acregmin = data->acregmin * HZ; 711 server->acregmax = data->acregmax * HZ; 712 server->acdirmin = data->acdirmin * HZ; 713 server->acdirmax = data->acdirmax * HZ; 714 715 /* Start lockd here, before we might error out */ 716 error = nfs_start_lockd(server); 717 if (error < 0) 718 goto error; 719 720 server->port = data->nfs_server.port; 721 722 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 723 if (error < 0) 724 goto error; 725 726 /* Preserve the values of mount_server-related mount options */ 727 if (data->mount_server.addrlen) { 728 memcpy(&server->mountd_address, &data->mount_server.address, 729 data->mount_server.addrlen); 730 server->mountd_addrlen = data->mount_server.addrlen; 731 } 732 server->mountd_version = data->mount_server.version; 733 server->mountd_port = data->mount_server.port; 734 server->mountd_protocol = data->mount_server.protocol; 735 736 server->namelen = data->namlen; 737 /* Create a client RPC handle for the NFSv3 ACL management interface */ 738 nfs_init_server_aclclient(server); 739 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 740 return 0; 741 742 error: 743 server->nfs_client = NULL; 744 nfs_put_client(clp); 745 dprintk("<-- nfs_init_server() = xerror %d\n", error); 746 return error; 747 } 748 749 /* 750 * Load up the server record from information gained in an fsinfo record 751 */ 752 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 753 { 754 unsigned long max_rpc_payload; 755 756 /* Work out a lot of parameters */ 757 if (server->rsize == 0) 758 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 759 if (server->wsize == 0) 760 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 761 762 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 763 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 764 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 765 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 766 767 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 768 if (server->rsize > max_rpc_payload) 769 server->rsize = max_rpc_payload; 770 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 771 server->rsize = NFS_MAX_FILE_IO_SIZE; 772 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 773 774 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 775 776 if (server->wsize > max_rpc_payload) 777 server->wsize = max_rpc_payload; 778 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 779 server->wsize = NFS_MAX_FILE_IO_SIZE; 780 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 781 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 782 783 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 784 if (server->dtsize > PAGE_CACHE_SIZE) 785 server->dtsize = PAGE_CACHE_SIZE; 786 if (server->dtsize > server->rsize) 787 server->dtsize = server->rsize; 788 789 if (server->flags & NFS_MOUNT_NOAC) { 790 server->acregmin = server->acregmax = 0; 791 server->acdirmin = server->acdirmax = 0; 792 } 793 794 server->maxfilesize = fsinfo->maxfilesize; 795 796 /* We're airborne Set socket buffersize */ 797 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 798 } 799 800 /* 801 * Probe filesystem information, including the FSID on v2/v3 802 */ 803 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 804 { 805 struct nfs_fsinfo fsinfo; 806 struct nfs_client *clp = server->nfs_client; 807 int error; 808 809 dprintk("--> nfs_probe_fsinfo()\n"); 810 811 if (clp->rpc_ops->set_capabilities != NULL) { 812 error = clp->rpc_ops->set_capabilities(server, mntfh); 813 if (error < 0) 814 goto out_error; 815 } 816 817 fsinfo.fattr = fattr; 818 nfs_fattr_init(fattr); 819 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 820 if (error < 0) 821 goto out_error; 822 823 nfs_server_set_fsinfo(server, &fsinfo); 824 error = bdi_init(&server->backing_dev_info); 825 if (error) 826 goto out_error; 827 828 829 /* Get some general file system info */ 830 if (server->namelen == 0) { 831 struct nfs_pathconf pathinfo; 832 833 pathinfo.fattr = fattr; 834 nfs_fattr_init(fattr); 835 836 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 837 server->namelen = pathinfo.max_namelen; 838 } 839 840 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 841 return 0; 842 843 out_error: 844 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 845 return error; 846 } 847 848 /* 849 * Copy useful information when duplicating a server record 850 */ 851 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 852 { 853 target->flags = source->flags; 854 target->acregmin = source->acregmin; 855 target->acregmax = source->acregmax; 856 target->acdirmin = source->acdirmin; 857 target->acdirmax = source->acdirmax; 858 target->caps = source->caps; 859 } 860 861 /* 862 * Allocate and initialise a server record 863 */ 864 static struct nfs_server *nfs_alloc_server(void) 865 { 866 struct nfs_server *server; 867 868 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 869 if (!server) 870 return NULL; 871 872 server->client = server->client_acl = ERR_PTR(-EINVAL); 873 874 /* Zero out the NFS state stuff */ 875 INIT_LIST_HEAD(&server->client_link); 876 INIT_LIST_HEAD(&server->master_link); 877 878 atomic_set(&server->active, 0); 879 880 server->io_stats = nfs_alloc_iostats(); 881 if (!server->io_stats) { 882 kfree(server); 883 return NULL; 884 } 885 886 return server; 887 } 888 889 /* 890 * Free up a server record 891 */ 892 void nfs_free_server(struct nfs_server *server) 893 { 894 dprintk("--> nfs_free_server()\n"); 895 896 spin_lock(&nfs_client_lock); 897 list_del(&server->client_link); 898 list_del(&server->master_link); 899 spin_unlock(&nfs_client_lock); 900 901 if (server->destroy != NULL) 902 server->destroy(server); 903 904 if (!IS_ERR(server->client_acl)) 905 rpc_shutdown_client(server->client_acl); 906 if (!IS_ERR(server->client)) 907 rpc_shutdown_client(server->client); 908 909 nfs_put_client(server->nfs_client); 910 911 nfs_free_iostats(server->io_stats); 912 bdi_destroy(&server->backing_dev_info); 913 kfree(server); 914 nfs_release_automount_timer(); 915 dprintk("<-- nfs_free_server()\n"); 916 } 917 918 /* 919 * Create a version 2 or 3 volume record 920 * - keyed on server and FSID 921 */ 922 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 923 struct nfs_fh *mntfh) 924 { 925 struct nfs_server *server; 926 struct nfs_fattr fattr; 927 int error; 928 929 server = nfs_alloc_server(); 930 if (!server) 931 return ERR_PTR(-ENOMEM); 932 933 /* Get a client representation */ 934 error = nfs_init_server(server, data); 935 if (error < 0) 936 goto error; 937 938 BUG_ON(!server->nfs_client); 939 BUG_ON(!server->nfs_client->rpc_ops); 940 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 941 942 /* Probe the root fh to retrieve its FSID */ 943 error = nfs_probe_fsinfo(server, mntfh, &fattr); 944 if (error < 0) 945 goto error; 946 if (server->nfs_client->rpc_ops->version == 3) { 947 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 948 server->namelen = NFS3_MAXNAMLEN; 949 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 950 server->caps |= NFS_CAP_READDIRPLUS; 951 } else { 952 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 953 server->namelen = NFS2_MAXNAMLEN; 954 } 955 956 if (!(fattr.valid & NFS_ATTR_FATTR)) { 957 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 958 if (error < 0) { 959 dprintk("nfs_create_server: getattr error = %d\n", -error); 960 goto error; 961 } 962 } 963 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 964 965 dprintk("Server FSID: %llx:%llx\n", 966 (unsigned long long) server->fsid.major, 967 (unsigned long long) server->fsid.minor); 968 969 BUG_ON(!server->nfs_client); 970 BUG_ON(!server->nfs_client->rpc_ops); 971 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 972 973 spin_lock(&nfs_client_lock); 974 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 975 list_add_tail(&server->master_link, &nfs_volume_list); 976 spin_unlock(&nfs_client_lock); 977 978 server->mount_time = jiffies; 979 return server; 980 981 error: 982 nfs_free_server(server); 983 return ERR_PTR(error); 984 } 985 986 #ifdef CONFIG_NFS_V4 987 /* 988 * Initialise an NFS4 client record 989 */ 990 static int nfs4_init_client(struct nfs_client *clp, 991 const struct rpc_timeout *timeparms, 992 const char *ip_addr, 993 rpc_authflavor_t authflavour, 994 int flags) 995 { 996 int error; 997 998 if (clp->cl_cons_state == NFS_CS_READY) { 999 /* the client is initialised already */ 1000 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1001 return 0; 1002 } 1003 1004 /* Check NFS protocol revision and initialize RPC op vector */ 1005 clp->rpc_ops = &nfs_v4_clientops; 1006 1007 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1008 1, flags & NFS_MOUNT_NORESVPORT); 1009 if (error < 0) 1010 goto error; 1011 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1012 1013 error = nfs_idmap_new(clp); 1014 if (error < 0) { 1015 dprintk("%s: failed to create idmapper. Error = %d\n", 1016 __func__, error); 1017 goto error; 1018 } 1019 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1020 1021 nfs_mark_client_ready(clp, NFS_CS_READY); 1022 return 0; 1023 1024 error: 1025 nfs_mark_client_ready(clp, error); 1026 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1027 return error; 1028 } 1029 1030 /* 1031 * Set up an NFS4 client 1032 */ 1033 static int nfs4_set_client(struct nfs_server *server, 1034 const char *hostname, 1035 const struct sockaddr *addr, 1036 const size_t addrlen, 1037 const char *ip_addr, 1038 rpc_authflavor_t authflavour, 1039 int proto, const struct rpc_timeout *timeparms) 1040 { 1041 struct nfs_client_initdata cl_init = { 1042 .hostname = hostname, 1043 .addr = addr, 1044 .addrlen = addrlen, 1045 .rpc_ops = &nfs_v4_clientops, 1046 .proto = proto, 1047 }; 1048 struct nfs_client *clp; 1049 int error; 1050 1051 dprintk("--> nfs4_set_client()\n"); 1052 1053 /* Allocate or find a client reference we can use */ 1054 clp = nfs_get_client(&cl_init); 1055 if (IS_ERR(clp)) { 1056 error = PTR_ERR(clp); 1057 goto error; 1058 } 1059 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1060 server->flags); 1061 if (error < 0) 1062 goto error_put; 1063 1064 server->nfs_client = clp; 1065 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1066 return 0; 1067 1068 error_put: 1069 nfs_put_client(clp); 1070 error: 1071 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1072 return error; 1073 } 1074 1075 /* 1076 * Create a version 4 volume record 1077 */ 1078 static int nfs4_init_server(struct nfs_server *server, 1079 const struct nfs_parsed_mount_data *data) 1080 { 1081 struct rpc_timeout timeparms; 1082 int error; 1083 1084 dprintk("--> nfs4_init_server()\n"); 1085 1086 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1087 data->timeo, data->retrans); 1088 1089 /* Initialise the client representation from the mount data */ 1090 server->flags = data->flags; 1091 server->caps |= NFS_CAP_ATOMIC_OPEN; 1092 1093 /* Get a client record */ 1094 error = nfs4_set_client(server, 1095 data->nfs_server.hostname, 1096 (const struct sockaddr *)&data->nfs_server.address, 1097 data->nfs_server.addrlen, 1098 data->client_address, 1099 data->auth_flavors[0], 1100 data->nfs_server.protocol, 1101 &timeparms); 1102 if (error < 0) 1103 goto error; 1104 1105 if (data->rsize) 1106 server->rsize = nfs_block_size(data->rsize, NULL); 1107 if (data->wsize) 1108 server->wsize = nfs_block_size(data->wsize, NULL); 1109 1110 server->acregmin = data->acregmin * HZ; 1111 server->acregmax = data->acregmax * HZ; 1112 server->acdirmin = data->acdirmin * HZ; 1113 server->acdirmax = data->acdirmax * HZ; 1114 1115 server->port = data->nfs_server.port; 1116 1117 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1118 1119 error: 1120 /* Done */ 1121 dprintk("<-- nfs4_init_server() = %d\n", error); 1122 return error; 1123 } 1124 1125 /* 1126 * Create a version 4 volume record 1127 * - keyed on server and FSID 1128 */ 1129 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1130 struct nfs_fh *mntfh) 1131 { 1132 struct nfs_fattr fattr; 1133 struct nfs_server *server; 1134 int error; 1135 1136 dprintk("--> nfs4_create_server()\n"); 1137 1138 server = nfs_alloc_server(); 1139 if (!server) 1140 return ERR_PTR(-ENOMEM); 1141 1142 /* set up the general RPC client */ 1143 error = nfs4_init_server(server, data); 1144 if (error < 0) 1145 goto error; 1146 1147 BUG_ON(!server->nfs_client); 1148 BUG_ON(!server->nfs_client->rpc_ops); 1149 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1150 1151 /* Probe the root fh to retrieve its FSID */ 1152 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1153 if (error < 0) 1154 goto error; 1155 1156 dprintk("Server FSID: %llx:%llx\n", 1157 (unsigned long long) server->fsid.major, 1158 (unsigned long long) server->fsid.minor); 1159 dprintk("Mount FH: %d\n", mntfh->size); 1160 1161 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1162 if (error < 0) 1163 goto error; 1164 1165 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1166 server->namelen = NFS4_MAXNAMLEN; 1167 1168 BUG_ON(!server->nfs_client); 1169 BUG_ON(!server->nfs_client->rpc_ops); 1170 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1171 1172 spin_lock(&nfs_client_lock); 1173 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1174 list_add_tail(&server->master_link, &nfs_volume_list); 1175 spin_unlock(&nfs_client_lock); 1176 1177 server->mount_time = jiffies; 1178 dprintk("<-- nfs4_create_server() = %p\n", server); 1179 return server; 1180 1181 error: 1182 nfs_free_server(server); 1183 dprintk("<-- nfs4_create_server() = error %d\n", error); 1184 return ERR_PTR(error); 1185 } 1186 1187 /* 1188 * Create an NFS4 referral server record 1189 */ 1190 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1191 struct nfs_fh *mntfh) 1192 { 1193 struct nfs_client *parent_client; 1194 struct nfs_server *server, *parent_server; 1195 struct nfs_fattr fattr; 1196 int error; 1197 1198 dprintk("--> nfs4_create_referral_server()\n"); 1199 1200 server = nfs_alloc_server(); 1201 if (!server) 1202 return ERR_PTR(-ENOMEM); 1203 1204 parent_server = NFS_SB(data->sb); 1205 parent_client = parent_server->nfs_client; 1206 1207 /* Initialise the client representation from the parent server */ 1208 nfs_server_copy_userdata(server, parent_server); 1209 server->caps |= NFS_CAP_ATOMIC_OPEN; 1210 1211 /* Get a client representation. 1212 * Note: NFSv4 always uses TCP, */ 1213 error = nfs4_set_client(server, data->hostname, 1214 data->addr, 1215 data->addrlen, 1216 parent_client->cl_ipaddr, 1217 data->authflavor, 1218 parent_server->client->cl_xprt->prot, 1219 parent_server->client->cl_timeout); 1220 if (error < 0) 1221 goto error; 1222 1223 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1224 if (error < 0) 1225 goto error; 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 /* Probe the root fh to retrieve its FSID and filehandle */ 1232 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1233 if (error < 0) 1234 goto error; 1235 1236 /* probe the filesystem info for this server filesystem */ 1237 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1238 if (error < 0) 1239 goto error; 1240 1241 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1242 server->namelen = NFS4_MAXNAMLEN; 1243 1244 dprintk("Referral FSID: %llx:%llx\n", 1245 (unsigned long long) server->fsid.major, 1246 (unsigned long long) server->fsid.minor); 1247 1248 spin_lock(&nfs_client_lock); 1249 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1250 list_add_tail(&server->master_link, &nfs_volume_list); 1251 spin_unlock(&nfs_client_lock); 1252 1253 server->mount_time = jiffies; 1254 1255 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1256 return server; 1257 1258 error: 1259 nfs_free_server(server); 1260 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1261 return ERR_PTR(error); 1262 } 1263 1264 #endif /* CONFIG_NFS_V4 */ 1265 1266 /* 1267 * Clone an NFS2, NFS3 or NFS4 server record 1268 */ 1269 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1270 struct nfs_fh *fh, 1271 struct nfs_fattr *fattr) 1272 { 1273 struct nfs_server *server; 1274 struct nfs_fattr fattr_fsinfo; 1275 int error; 1276 1277 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1278 (unsigned long long) fattr->fsid.major, 1279 (unsigned long long) fattr->fsid.minor); 1280 1281 server = nfs_alloc_server(); 1282 if (!server) 1283 return ERR_PTR(-ENOMEM); 1284 1285 /* Copy data from the source */ 1286 server->nfs_client = source->nfs_client; 1287 atomic_inc(&server->nfs_client->cl_count); 1288 nfs_server_copy_userdata(server, source); 1289 1290 server->fsid = fattr->fsid; 1291 1292 error = nfs_init_server_rpcclient(server, 1293 source->client->cl_timeout, 1294 source->client->cl_auth->au_flavor); 1295 if (error < 0) 1296 goto out_free_server; 1297 if (!IS_ERR(source->client_acl)) 1298 nfs_init_server_aclclient(server); 1299 1300 /* probe the filesystem info for this server filesystem */ 1301 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1302 if (error < 0) 1303 goto out_free_server; 1304 1305 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1306 server->namelen = NFS4_MAXNAMLEN; 1307 1308 dprintk("Cloned FSID: %llx:%llx\n", 1309 (unsigned long long) server->fsid.major, 1310 (unsigned long long) server->fsid.minor); 1311 1312 error = nfs_start_lockd(server); 1313 if (error < 0) 1314 goto out_free_server; 1315 1316 spin_lock(&nfs_client_lock); 1317 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1318 list_add_tail(&server->master_link, &nfs_volume_list); 1319 spin_unlock(&nfs_client_lock); 1320 1321 server->mount_time = jiffies; 1322 1323 dprintk("<-- nfs_clone_server() = %p\n", server); 1324 return server; 1325 1326 out_free_server: 1327 nfs_free_server(server); 1328 dprintk("<-- nfs_clone_server() = error %d\n", error); 1329 return ERR_PTR(error); 1330 } 1331 1332 #ifdef CONFIG_PROC_FS 1333 static struct proc_dir_entry *proc_fs_nfs; 1334 1335 static int nfs_server_list_open(struct inode *inode, struct file *file); 1336 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1337 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1338 static void nfs_server_list_stop(struct seq_file *p, void *v); 1339 static int nfs_server_list_show(struct seq_file *m, void *v); 1340 1341 static struct seq_operations nfs_server_list_ops = { 1342 .start = nfs_server_list_start, 1343 .next = nfs_server_list_next, 1344 .stop = nfs_server_list_stop, 1345 .show = nfs_server_list_show, 1346 }; 1347 1348 static const struct file_operations nfs_server_list_fops = { 1349 .open = nfs_server_list_open, 1350 .read = seq_read, 1351 .llseek = seq_lseek, 1352 .release = seq_release, 1353 .owner = THIS_MODULE, 1354 }; 1355 1356 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1357 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1358 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1359 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1360 static int nfs_volume_list_show(struct seq_file *m, void *v); 1361 1362 static struct seq_operations nfs_volume_list_ops = { 1363 .start = nfs_volume_list_start, 1364 .next = nfs_volume_list_next, 1365 .stop = nfs_volume_list_stop, 1366 .show = nfs_volume_list_show, 1367 }; 1368 1369 static const struct file_operations nfs_volume_list_fops = { 1370 .open = nfs_volume_list_open, 1371 .read = seq_read, 1372 .llseek = seq_lseek, 1373 .release = seq_release, 1374 .owner = THIS_MODULE, 1375 }; 1376 1377 /* 1378 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1379 * we're dealing 1380 */ 1381 static int nfs_server_list_open(struct inode *inode, struct file *file) 1382 { 1383 struct seq_file *m; 1384 int ret; 1385 1386 ret = seq_open(file, &nfs_server_list_ops); 1387 if (ret < 0) 1388 return ret; 1389 1390 m = file->private_data; 1391 m->private = PDE(inode)->data; 1392 1393 return 0; 1394 } 1395 1396 /* 1397 * set up the iterator to start reading from the server list and return the first item 1398 */ 1399 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1400 { 1401 /* lock the list against modification */ 1402 spin_lock(&nfs_client_lock); 1403 return seq_list_start_head(&nfs_client_list, *_pos); 1404 } 1405 1406 /* 1407 * move to next server 1408 */ 1409 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1410 { 1411 return seq_list_next(v, &nfs_client_list, pos); 1412 } 1413 1414 /* 1415 * clean up after reading from the transports list 1416 */ 1417 static void nfs_server_list_stop(struct seq_file *p, void *v) 1418 { 1419 spin_unlock(&nfs_client_lock); 1420 } 1421 1422 /* 1423 * display a header line followed by a load of call lines 1424 */ 1425 static int nfs_server_list_show(struct seq_file *m, void *v) 1426 { 1427 struct nfs_client *clp; 1428 1429 /* display header on line 1 */ 1430 if (v == &nfs_client_list) { 1431 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1432 return 0; 1433 } 1434 1435 /* display one transport per line on subsequent lines */ 1436 clp = list_entry(v, struct nfs_client, cl_share_link); 1437 1438 seq_printf(m, "v%u %s %s %3d %s\n", 1439 clp->rpc_ops->version, 1440 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1441 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1442 atomic_read(&clp->cl_count), 1443 clp->cl_hostname); 1444 1445 return 0; 1446 } 1447 1448 /* 1449 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1450 */ 1451 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1452 { 1453 struct seq_file *m; 1454 int ret; 1455 1456 ret = seq_open(file, &nfs_volume_list_ops); 1457 if (ret < 0) 1458 return ret; 1459 1460 m = file->private_data; 1461 m->private = PDE(inode)->data; 1462 1463 return 0; 1464 } 1465 1466 /* 1467 * set up the iterator to start reading from the volume list and return the first item 1468 */ 1469 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1470 { 1471 /* lock the list against modification */ 1472 spin_lock(&nfs_client_lock); 1473 return seq_list_start_head(&nfs_volume_list, *_pos); 1474 } 1475 1476 /* 1477 * move to next volume 1478 */ 1479 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1480 { 1481 return seq_list_next(v, &nfs_volume_list, pos); 1482 } 1483 1484 /* 1485 * clean up after reading from the transports list 1486 */ 1487 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1488 { 1489 spin_unlock(&nfs_client_lock); 1490 } 1491 1492 /* 1493 * display a header line followed by a load of call lines 1494 */ 1495 static int nfs_volume_list_show(struct seq_file *m, void *v) 1496 { 1497 struct nfs_server *server; 1498 struct nfs_client *clp; 1499 char dev[8], fsid[17]; 1500 1501 /* display header on line 1 */ 1502 if (v == &nfs_volume_list) { 1503 seq_puts(m, "NV SERVER PORT DEV FSID\n"); 1504 return 0; 1505 } 1506 /* display one transport per line on subsequent lines */ 1507 server = list_entry(v, struct nfs_server, master_link); 1508 clp = server->nfs_client; 1509 1510 snprintf(dev, 8, "%u:%u", 1511 MAJOR(server->s_dev), MINOR(server->s_dev)); 1512 1513 snprintf(fsid, 17, "%llx:%llx", 1514 (unsigned long long) server->fsid.major, 1515 (unsigned long long) server->fsid.minor); 1516 1517 seq_printf(m, "v%u %s %s %-7s %-17s\n", 1518 clp->rpc_ops->version, 1519 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1520 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1521 dev, 1522 fsid); 1523 1524 return 0; 1525 } 1526 1527 /* 1528 * initialise the /proc/fs/nfsfs/ directory 1529 */ 1530 int __init nfs_fs_proc_init(void) 1531 { 1532 struct proc_dir_entry *p; 1533 1534 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1535 if (!proc_fs_nfs) 1536 goto error_0; 1537 1538 proc_fs_nfs->owner = THIS_MODULE; 1539 1540 /* a file of servers with which we're dealing */ 1541 p = proc_create("servers", S_IFREG|S_IRUGO, 1542 proc_fs_nfs, &nfs_server_list_fops); 1543 if (!p) 1544 goto error_1; 1545 1546 /* a file of volumes that we have mounted */ 1547 p = proc_create("volumes", S_IFREG|S_IRUGO, 1548 proc_fs_nfs, &nfs_volume_list_fops); 1549 if (!p) 1550 goto error_2; 1551 return 0; 1552 1553 error_2: 1554 remove_proc_entry("servers", proc_fs_nfs); 1555 error_1: 1556 remove_proc_entry("fs/nfsfs", NULL); 1557 error_0: 1558 return -ENOMEM; 1559 } 1560 1561 /* 1562 * clean up the /proc/fs/nfsfs/ directory 1563 */ 1564 void nfs_fs_proc_exit(void) 1565 { 1566 remove_proc_entry("volumes", proc_fs_nfs); 1567 remove_proc_entry("servers", proc_fs_nfs); 1568 remove_proc_entry("fs/nfsfs", NULL); 1569 } 1570 1571 #endif /* CONFIG_PROC_FS */ 1572