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