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/nfs_fs.h> 27#include <linux/nfs_mount.h> 28#include <linux/nfs4_mount.h> 29#include <linux/lockd/bind.h> 30#include <linux/seq_file.h> 31#include <linux/mount.h> 32#include <linux/nfs_idmap.h> 33#include <linux/vfs.h> 34#include <linux/inet.h> 35#include <linux/nfs_xdr.h> 36 37#include <asm/system.h> 38 39#include "nfs4_fs.h" 40#include "callback.h" 41#include "delegation.h" 42#include "iostat.h" 43#include "internal.h" 44 45#define NFSDBG_FACILITY NFSDBG_CLIENT 46 47static DEFINE_SPINLOCK(nfs_client_lock); 48static LIST_HEAD(nfs_client_list); 49static LIST_HEAD(nfs_volume_list); 50static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 51 52/* 53 * RPC cruft for NFS 54 */ 55static struct rpc_version *nfs_version[5] = { 56 [2] = &nfs_version2, 57#ifdef CONFIG_NFS_V3 58 [3] = &nfs_version3, 59#endif 60#ifdef CONFIG_NFS_V4 61 [4] = &nfs_version4, 62#endif 63}; 64 65struct rpc_program nfs_program = { 66 .name = "nfs", 67 .number = NFS_PROGRAM, 68 .nrvers = ARRAY_SIZE(nfs_version), 69 .version = nfs_version, 70 .stats = &nfs_rpcstat, 71 .pipe_dir_name = "/nfs", 72}; 73 74struct rpc_stat nfs_rpcstat = { 75 .program = &nfs_program 76}; 77 78 79#ifdef CONFIG_NFS_V3_ACL 80static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 81static struct rpc_version * nfsacl_version[] = { 82 [3] = &nfsacl_version3, 83}; 84 85struct rpc_program nfsacl_program = { 86 .name = "nfsacl", 87 .number = NFS_ACL_PROGRAM, 88 .nrvers = ARRAY_SIZE(nfsacl_version), 89 .version = nfsacl_version, 90 .stats = &nfsacl_rpcstat, 91}; 92#endif /* CONFIG_NFS_V3_ACL */ 93 94/* 95 * Allocate a shared client record 96 * 97 * Since these are allocated/deallocated very rarely, we don't 98 * bother putting them in a slab cache... 99 */ 100static struct nfs_client *nfs_alloc_client(const char *hostname, 101 const struct sockaddr_in *addr, 102 int nfsversion) 103{ 104 struct nfs_client *clp; 105 int error; 106 107 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 108 goto error_0; 109 110 error = rpciod_up(); 111 if (error < 0) { 112 dprintk("%s: couldn't start rpciod! Error = %d\n", 113 __FUNCTION__, error); 114 goto error_1; 115 } 116 __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state); 117 118 if (nfsversion == 4) { 119 if (nfs_callback_up() < 0) 120 goto error_2; 121 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 122 } 123 124 atomic_set(&clp->cl_count, 1); 125 clp->cl_cons_state = NFS_CS_INITING; 126 127 clp->cl_nfsversion = nfsversion; 128 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); 129 130 if (hostname) { 131 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL); 132 if (!clp->cl_hostname) 133 goto error_3; 134 } 135 136 INIT_LIST_HEAD(&clp->cl_superblocks); 137 clp->cl_rpcclient = ERR_PTR(-EINVAL); 138 139#ifdef CONFIG_NFS_V4 140 init_rwsem(&clp->cl_sem); 141 INIT_LIST_HEAD(&clp->cl_delegations); 142 INIT_LIST_HEAD(&clp->cl_state_owners); 143 INIT_LIST_HEAD(&clp->cl_unused); 144 spin_lock_init(&clp->cl_lock); 145 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 146 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 147 clp->cl_boot_time = CURRENT_TIME; 148 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 149#endif 150 151 return clp; 152 153error_3: 154 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 155 nfs_callback_down(); 156error_2: 157 rpciod_down(); 158 __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state); 159error_1: 160 kfree(clp); 161error_0: 162 return NULL; 163} 164 165static void nfs4_shutdown_client(struct nfs_client *clp) 166{ 167#ifdef CONFIG_NFS_V4 168 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 169 nfs4_kill_renewd(clp); 170 while (!list_empty(&clp->cl_unused)) { 171 struct nfs4_state_owner *sp; 172 173 sp = list_entry(clp->cl_unused.next, 174 struct nfs4_state_owner, 175 so_list); 176 list_del(&sp->so_list); 177 kfree(sp); 178 } 179 BUG_ON(!list_empty(&clp->cl_state_owners)); 180 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 181 nfs_idmap_delete(clp); 182#endif 183} 184 185/* 186 * Destroy a shared client record 187 */ 188static void nfs_free_client(struct nfs_client *clp) 189{ 190 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion); 191 192 nfs4_shutdown_client(clp); 193 194 /* -EIO all pending I/O */ 195 if (!IS_ERR(clp->cl_rpcclient)) 196 rpc_shutdown_client(clp->cl_rpcclient); 197 198 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 199 nfs_callback_down(); 200 201 if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state)) 202 rpciod_down(); 203 204 kfree(clp->cl_hostname); 205 kfree(clp); 206 207 dprintk("<-- nfs_free_client()\n"); 208} 209 210/* 211 * Release a reference to a shared client record 212 */ 213void nfs_put_client(struct nfs_client *clp) 214{ 215 if (!clp) 216 return; 217 218 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 219 220 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 221 list_del(&clp->cl_share_link); 222 spin_unlock(&nfs_client_lock); 223 224 BUG_ON(!list_empty(&clp->cl_superblocks)); 225 226 nfs_free_client(clp); 227 } 228} 229 230/* 231 * Find a client by address 232 * - caller must hold nfs_client_lock 233 */ 234static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port) 235{ 236 struct nfs_client *clp; 237 238 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 239 /* Don't match clients that failed to initialise properly */ 240 if (clp->cl_cons_state < 0) 241 continue; 242 243 /* Different NFS versions cannot share the same nfs_client */ 244 if (clp->cl_nfsversion != nfsversion) 245 continue; 246 247 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr, 248 sizeof(clp->cl_addr.sin_addr)) != 0) 249 continue; 250 251 if (!match_port || clp->cl_addr.sin_port == addr->sin_port) 252 goto found; 253 } 254 255 return NULL; 256 257found: 258 atomic_inc(&clp->cl_count); 259 return clp; 260} 261 262/* 263 * Find a client by IP address and protocol version 264 * - returns NULL if no such client 265 */ 266struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion) 267{ 268 struct nfs_client *clp; 269 270 spin_lock(&nfs_client_lock); 271 clp = __nfs_find_client(addr, nfsversion, 0); 272 spin_unlock(&nfs_client_lock); 273 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) { 274 nfs_put_client(clp); 275 clp = NULL; 276 } 277 return clp; 278} 279 280/* 281 * Look up a client by IP address and protocol version 282 * - creates a new record if one doesn't yet exist 283 */ 284static struct nfs_client *nfs_get_client(const char *hostname, 285 const struct sockaddr_in *addr, 286 int nfsversion) 287{ 288 struct nfs_client *clp, *new = NULL; 289 int error; 290 291 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", 292 hostname ?: "", NIPQUAD(addr->sin_addr), 293 addr->sin_port, nfsversion); 294 295 /* see if the client already exists */ 296 do { 297 spin_lock(&nfs_client_lock); 298 299 clp = __nfs_find_client(addr, nfsversion, 1); 300 if (clp) 301 goto found_client; 302 if (new) 303 goto install_client; 304 305 spin_unlock(&nfs_client_lock); 306 307 new = nfs_alloc_client(hostname, addr, nfsversion); 308 } while (new); 309 310 return ERR_PTR(-ENOMEM); 311 312 /* install a new client and return with it unready */ 313install_client: 314 clp = new; 315 list_add(&clp->cl_share_link, &nfs_client_list); 316 spin_unlock(&nfs_client_lock); 317 dprintk("--> nfs_get_client() = %p [new]\n", clp); 318 return clp; 319 320 /* found an existing client 321 * - make sure it's ready before returning 322 */ 323found_client: 324 spin_unlock(&nfs_client_lock); 325 326 if (new) 327 nfs_free_client(new); 328 329 error = wait_event_interruptible(nfs_client_active_wq, 330 clp->cl_cons_state != NFS_CS_INITING); 331 if (error < 0) { 332 nfs_put_client(clp); 333 return ERR_PTR(-ERESTARTSYS); 334 } 335 336 if (clp->cl_cons_state < NFS_CS_READY) { 337 error = clp->cl_cons_state; 338 nfs_put_client(clp); 339 return ERR_PTR(error); 340 } 341 342 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 343 344 dprintk("--> nfs_get_client() = %p [share]\n", clp); 345 return clp; 346} 347 348/* 349 * Mark a server as ready or failed 350 */ 351static void nfs_mark_client_ready(struct nfs_client *clp, int state) 352{ 353 clp->cl_cons_state = state; 354 wake_up_all(&nfs_client_active_wq); 355} 356 357/* 358 * Initialise the timeout values for a connection 359 */ 360static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 361 unsigned int timeo, unsigned int retrans) 362{ 363 to->to_initval = timeo * HZ / 10; 364 to->to_retries = retrans; 365 if (!to->to_retries) 366 to->to_retries = 2; 367 368 switch (proto) { 369 case IPPROTO_TCP: 370 if (!to->to_initval) 371 to->to_initval = 60 * HZ; 372 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 373 to->to_initval = NFS_MAX_TCP_TIMEOUT; 374 to->to_increment = to->to_initval; 375 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 376 to->to_exponential = 0; 377 break; 378 case IPPROTO_UDP: 379 default: 380 if (!to->to_initval) 381 to->to_initval = 11 * HZ / 10; 382 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 383 to->to_initval = NFS_MAX_UDP_TIMEOUT; 384 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 385 to->to_exponential = 1; 386 break; 387 } 388} 389 390/* 391 * Create an RPC client handle 392 */ 393static int nfs_create_rpc_client(struct nfs_client *clp, int proto, 394 unsigned int timeo, 395 unsigned int retrans, 396 rpc_authflavor_t flavor, 397 int flags) 398{ 399 struct rpc_timeout timeparms; 400 struct rpc_clnt *clnt = NULL; 401 struct rpc_create_args args = { 402 .protocol = proto, 403 .address = (struct sockaddr *)&clp->cl_addr, 404 .addrsize = sizeof(clp->cl_addr), 405 .timeout = &timeparms, 406 .servername = clp->cl_hostname, 407 .program = &nfs_program, 408 .version = clp->rpc_ops->version, 409 .authflavor = flavor, 410 .flags = flags, 411 }; 412 413 if (!IS_ERR(clp->cl_rpcclient)) 414 return 0; 415 416 nfs_init_timeout_values(&timeparms, proto, timeo, retrans); 417 clp->retrans_timeo = timeparms.to_initval; 418 clp->retrans_count = timeparms.to_retries; 419 420 clnt = rpc_create(&args); 421 if (IS_ERR(clnt)) { 422 dprintk("%s: cannot create RPC client. Error = %ld\n", 423 __FUNCTION__, PTR_ERR(clnt)); 424 return PTR_ERR(clnt); 425 } 426 427 clp->cl_rpcclient = clnt; 428 return 0; 429} 430 431/* 432 * Version 2 or 3 client destruction 433 */ 434static void nfs_destroy_server(struct nfs_server *server) 435{ 436 if (!IS_ERR(server->client_acl)) 437 rpc_shutdown_client(server->client_acl); 438 439 if (!(server->flags & NFS_MOUNT_NONLM)) 440 lockd_down(); /* release rpc.lockd */ 441} 442 443/* 444 * Version 2 or 3 lockd setup 445 */ 446static int nfs_start_lockd(struct nfs_server *server) 447{ 448 int error = 0; 449 450 if (server->nfs_client->cl_nfsversion > 3) 451 goto out; 452 if (server->flags & NFS_MOUNT_NONLM) 453 goto out; 454 error = lockd_up((server->flags & NFS_MOUNT_TCP) ? 455 IPPROTO_TCP : IPPROTO_UDP); 456 if (error < 0) 457 server->flags |= NFS_MOUNT_NONLM; 458 else 459 server->destroy = nfs_destroy_server; 460out: 461 return error; 462} 463 464/* 465 * Initialise an NFSv3 ACL client connection 466 */ 467#ifdef CONFIG_NFS_V3_ACL 468static void nfs_init_server_aclclient(struct nfs_server *server) 469{ 470 if (server->nfs_client->cl_nfsversion != 3) 471 goto out_noacl; 472 if (server->flags & NFS_MOUNT_NOACL) 473 goto out_noacl; 474 475 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 476 if (IS_ERR(server->client_acl)) 477 goto out_noacl; 478 479 /* No errors! Assume that Sun nfsacls are supported */ 480 server->caps |= NFS_CAP_ACLS; 481 return; 482 483out_noacl: 484 server->caps &= ~NFS_CAP_ACLS; 485} 486#else 487static inline void nfs_init_server_aclclient(struct nfs_server *server) 488{ 489 server->flags &= ~NFS_MOUNT_NOACL; 490 server->caps &= ~NFS_CAP_ACLS; 491} 492#endif 493 494/* 495 * Create a general RPC client 496 */ 497static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour) 498{ 499 struct nfs_client *clp = server->nfs_client; 500 501 server->client = rpc_clone_client(clp->cl_rpcclient); 502 if (IS_ERR(server->client)) { 503 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__); 504 return PTR_ERR(server->client); 505 } 506 507 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 508 struct rpc_auth *auth; 509 510 auth = rpcauth_create(pseudoflavour, server->client); 511 if (IS_ERR(auth)) { 512 dprintk("%s: couldn't create credcache!\n", __FUNCTION__); 513 return PTR_ERR(auth); 514 } 515 } 516 server->client->cl_softrtry = 0; 517 if (server->flags & NFS_MOUNT_SOFT) 518 server->client->cl_softrtry = 1; 519 520 server->client->cl_intr = 0; 521 if (server->flags & NFS4_MOUNT_INTR) 522 server->client->cl_intr = 1; 523 524 return 0; 525} 526 527/* 528 * Initialise an NFS2 or NFS3 client 529 */ 530static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data) 531{ 532 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; 533 int error; 534 535 if (clp->cl_cons_state == NFS_CS_READY) { 536 /* the client is already initialised */ 537 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 538 return 0; 539 } 540 541 /* Check NFS protocol revision and initialize RPC op vector */ 542 clp->rpc_ops = &nfs_v2_clientops; 543#ifdef CONFIG_NFS_V3 544 if (clp->cl_nfsversion == 3) 545 clp->rpc_ops = &nfs_v3_clientops; 546#endif 547 /* 548 * Create a client RPC handle for doing FSSTAT with UNIX auth only 549 * - RFC 2623, sec 2.3.2 550 */ 551 error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans, 552 RPC_AUTH_UNIX, 0); 553 if (error < 0) 554 goto error; 555 nfs_mark_client_ready(clp, NFS_CS_READY); 556 return 0; 557 558error: 559 nfs_mark_client_ready(clp, error); 560 dprintk("<-- nfs_init_client() = xerror %d\n", error); 561 return error; 562} 563 564/* 565 * Create a version 2 or 3 client 566 */ 567static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data) 568{ 569 struct nfs_client *clp; 570 int error, nfsvers = 2; 571 572 dprintk("--> nfs_init_server()\n"); 573 574#ifdef CONFIG_NFS_V3 575 if (data->flags & NFS_MOUNT_VER3) 576 nfsvers = 3; 577#endif 578 579 /* Allocate or find a client reference we can use */ 580 clp = nfs_get_client(data->hostname, &data->addr, nfsvers); 581 if (IS_ERR(clp)) { 582 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 583 return PTR_ERR(clp); 584 } 585 586 error = nfs_init_client(clp, data); 587 if (error < 0) 588 goto error; 589 590 server->nfs_client = clp; 591 592 /* Initialise the client representation from the mount data */ 593 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 594 595 if (data->rsize) 596 server->rsize = nfs_block_size(data->rsize, NULL); 597 if (data->wsize) 598 server->wsize = nfs_block_size(data->wsize, NULL); 599 600 server->acregmin = data->acregmin * HZ; 601 server->acregmax = data->acregmax * HZ; 602 server->acdirmin = data->acdirmin * HZ; 603 server->acdirmax = data->acdirmax * HZ; 604 605 /* Start lockd here, before we might error out */ 606 error = nfs_start_lockd(server); 607 if (error < 0) 608 goto error; 609 610 error = nfs_init_server_rpcclient(server, data->pseudoflavor); 611 if (error < 0) 612 goto error; 613 614 server->namelen = data->namlen; 615 /* Create a client RPC handle for the NFSv3 ACL management interface */ 616 nfs_init_server_aclclient(server); 617 if (clp->cl_nfsversion == 3) { 618 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 619 server->namelen = NFS3_MAXNAMLEN; 620 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 621 server->caps |= NFS_CAP_READDIRPLUS; 622 } else { 623 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 624 server->namelen = NFS2_MAXNAMLEN; 625 } 626 627 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 628 return 0; 629 630error: 631 server->nfs_client = NULL; 632 nfs_put_client(clp); 633 dprintk("<-- nfs_init_server() = xerror %d\n", error); 634 return error; 635} 636 637/* 638 * Load up the server record from information gained in an fsinfo record 639 */ 640static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 641{ 642 unsigned long max_rpc_payload; 643 644 /* Work out a lot of parameters */ 645 if (server->rsize == 0) 646 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 647 if (server->wsize == 0) 648 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 649 650 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 651 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 652 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 653 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 654 655 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 656 if (server->rsize > max_rpc_payload) 657 server->rsize = max_rpc_payload; 658 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 659 server->rsize = NFS_MAX_FILE_IO_SIZE; 660 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 661 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 662 663 if (server->wsize > max_rpc_payload) 664 server->wsize = max_rpc_payload; 665 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 666 server->wsize = NFS_MAX_FILE_IO_SIZE; 667 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 668 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 669 670 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 671 if (server->dtsize > PAGE_CACHE_SIZE) 672 server->dtsize = PAGE_CACHE_SIZE; 673 if (server->dtsize > server->rsize) 674 server->dtsize = server->rsize; 675 676 if (server->flags & NFS_MOUNT_NOAC) { 677 server->acregmin = server->acregmax = 0; 678 server->acdirmin = server->acdirmax = 0; 679 } 680 681 server->maxfilesize = fsinfo->maxfilesize; 682 683 /* We're airborne Set socket buffersize */ 684 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 685} 686 687/* 688 * Probe filesystem information, including the FSID on v2/v3 689 */ 690static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 691{ 692 struct nfs_fsinfo fsinfo; 693 struct nfs_client *clp = server->nfs_client; 694 int error; 695 696 dprintk("--> nfs_probe_fsinfo()\n"); 697 698 if (clp->rpc_ops->set_capabilities != NULL) { 699 error = clp->rpc_ops->set_capabilities(server, mntfh); 700 if (error < 0) 701 goto out_error; 702 } 703 704 fsinfo.fattr = fattr; 705 nfs_fattr_init(fattr); 706 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 707 if (error < 0) 708 goto out_error; 709 710 nfs_server_set_fsinfo(server, &fsinfo); 711 712 /* Get some general file system info */ 713 if (server->namelen == 0) { 714 struct nfs_pathconf pathinfo; 715 716 pathinfo.fattr = fattr; 717 nfs_fattr_init(fattr); 718 719 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 720 server->namelen = pathinfo.max_namelen; 721 } 722 723 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 724 return 0; 725 726out_error: 727 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 728 return error; 729} 730 731/* 732 * Copy useful information when duplicating a server record 733 */ 734static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 735{ 736 target->flags = source->flags; 737 target->acregmin = source->acregmin; 738 target->acregmax = source->acregmax; 739 target->acdirmin = source->acdirmin; 740 target->acdirmax = source->acdirmax; 741 target->caps = source->caps; 742} 743 744/* 745 * Allocate and initialise a server record 746 */ 747static struct nfs_server *nfs_alloc_server(void) 748{ 749 struct nfs_server *server; 750 751 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 752 if (!server) 753 return NULL; 754 755 server->client = server->client_acl = ERR_PTR(-EINVAL); 756 757 /* Zero out the NFS state stuff */ 758 INIT_LIST_HEAD(&server->client_link); 759 INIT_LIST_HEAD(&server->master_link); 760 761 server->io_stats = nfs_alloc_iostats(); 762 if (!server->io_stats) { 763 kfree(server); 764 return NULL; 765 } 766 767 return server; 768} 769 770/* 771 * Free up a server record 772 */ 773void nfs_free_server(struct nfs_server *server) 774{ 775 dprintk("--> nfs_free_server()\n"); 776 777 spin_lock(&nfs_client_lock); 778 list_del(&server->client_link); 779 list_del(&server->master_link); 780 spin_unlock(&nfs_client_lock); 781 782 if (server->destroy != NULL) 783 server->destroy(server); 784 if (!IS_ERR(server->client)) 785 rpc_shutdown_client(server->client); 786 787 nfs_put_client(server->nfs_client); 788 789 nfs_free_iostats(server->io_stats); 790 kfree(server); 791 nfs_release_automount_timer(); 792 dprintk("<-- nfs_free_server()\n"); 793} 794 795/* 796 * Create a version 2 or 3 volume record 797 * - keyed on server and FSID 798 */ 799struct nfs_server *nfs_create_server(const struct nfs_mount_data *data, 800 struct nfs_fh *mntfh) 801{ 802 struct nfs_server *server; 803 struct nfs_fattr fattr; 804 int error; 805 806 server = nfs_alloc_server(); 807 if (!server) 808 return ERR_PTR(-ENOMEM); 809 810 /* Get a client representation */ 811 error = nfs_init_server(server, data); 812 if (error < 0) 813 goto error; 814 815 BUG_ON(!server->nfs_client); 816 BUG_ON(!server->nfs_client->rpc_ops); 817 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 818 819 /* Probe the root fh to retrieve its FSID */ 820 error = nfs_probe_fsinfo(server, mntfh, &fattr); 821 if (error < 0) 822 goto error; 823 if (!(fattr.valid & NFS_ATTR_FATTR)) { 824 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 825 if (error < 0) { 826 dprintk("nfs_create_server: getattr error = %d\n", -error); 827 goto error; 828 } 829 } 830 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 831 832 dprintk("Server FSID: %llx:%llx\n", 833 (unsigned long long) server->fsid.major, 834 (unsigned long long) server->fsid.minor); 835 836 BUG_ON(!server->nfs_client); 837 BUG_ON(!server->nfs_client->rpc_ops); 838 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 839 840 spin_lock(&nfs_client_lock); 841 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 842 list_add_tail(&server->master_link, &nfs_volume_list); 843 spin_unlock(&nfs_client_lock); 844 845 server->mount_time = jiffies; 846 return server; 847 848error: 849 nfs_free_server(server); 850 return ERR_PTR(error); 851} 852 853#ifdef CONFIG_NFS_V4 854/* 855 * Initialise an NFS4 client record 856 */ 857static int nfs4_init_client(struct nfs_client *clp, 858 int proto, int timeo, int retrans, 859 const char *ip_addr, 860 rpc_authflavor_t authflavour) 861{ 862 int error; 863 864 if (clp->cl_cons_state == NFS_CS_READY) { 865 /* the client is initialised already */ 866 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 867 return 0; 868 } 869 870 /* Check NFS protocol revision and initialize RPC op vector */ 871 clp->rpc_ops = &nfs_v4_clientops; 872 873 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour, 874 RPC_CLNT_CREATE_DISCRTRY); 875 if (error < 0) 876 goto error; 877 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 878 879 error = nfs_idmap_new(clp); 880 if (error < 0) { 881 dprintk("%s: failed to create idmapper. Error = %d\n", 882 __FUNCTION__, error); 883 goto error; 884 } 885 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 886 887 nfs_mark_client_ready(clp, NFS_CS_READY); 888 return 0; 889 890error: 891 nfs_mark_client_ready(clp, error); 892 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 893 return error; 894} 895 896/* 897 * Set up an NFS4 client 898 */ 899static int nfs4_set_client(struct nfs_server *server, 900 const char *hostname, const struct sockaddr_in *addr, 901 const char *ip_addr, 902 rpc_authflavor_t authflavour, 903 int proto, int timeo, int retrans) 904{ 905 struct nfs_client *clp; 906 int error; 907 908 dprintk("--> nfs4_set_client()\n"); 909 910 /* Allocate or find a client reference we can use */ 911 clp = nfs_get_client(hostname, addr, 4); 912 if (IS_ERR(clp)) { 913 error = PTR_ERR(clp); 914 goto error; 915 } 916 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour); 917 if (error < 0) 918 goto error_put; 919 920 server->nfs_client = clp; 921 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 922 return 0; 923 924error_put: 925 nfs_put_client(clp); 926error: 927 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 928 return error; 929} 930 931/* 932 * Create a version 4 volume record 933 */ 934static int nfs4_init_server(struct nfs_server *server, 935 const struct nfs4_mount_data *data, rpc_authflavor_t authflavour) 936{ 937 int error; 938 939 dprintk("--> nfs4_init_server()\n"); 940 941 /* Initialise the client representation from the mount data */ 942 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 943 server->caps |= NFS_CAP_ATOMIC_OPEN; 944 945 if (data->rsize) 946 server->rsize = nfs_block_size(data->rsize, NULL); 947 if (data->wsize) 948 server->wsize = nfs_block_size(data->wsize, NULL); 949 950 server->acregmin = data->acregmin * HZ; 951 server->acregmax = data->acregmax * HZ; 952 server->acdirmin = data->acdirmin * HZ; 953 server->acdirmax = data->acdirmax * HZ; 954 955 error = nfs_init_server_rpcclient(server, authflavour); 956 957 /* Done */ 958 dprintk("<-- nfs4_init_server() = %d\n", error); 959 return error; 960} 961 962/* 963 * Create a version 4 volume record 964 * - keyed on server and FSID 965 */ 966struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data, 967 const char *hostname, 968 const struct sockaddr_in *addr, 969 const char *mntpath, 970 const char *ip_addr, 971 rpc_authflavor_t authflavour, 972 struct nfs_fh *mntfh) 973{ 974 struct nfs_fattr fattr; 975 struct nfs_server *server; 976 int error; 977 978 dprintk("--> nfs4_create_server()\n"); 979 980 server = nfs_alloc_server(); 981 if (!server) 982 return ERR_PTR(-ENOMEM); 983 984 /* Get a client record */ 985 error = nfs4_set_client(server, hostname, addr, ip_addr, authflavour, 986 data->proto, data->timeo, data->retrans); 987 if (error < 0) 988 goto error; 989 990 /* set up the general RPC client */ 991 error = nfs4_init_server(server, data, authflavour); 992 if (error < 0) 993 goto error; 994 995 BUG_ON(!server->nfs_client); 996 BUG_ON(!server->nfs_client->rpc_ops); 997 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 998 999 /* Probe the root fh to retrieve its FSID */ 1000 error = nfs4_path_walk(server, mntfh, mntpath); 1001 if (error < 0) 1002 goto error; 1003 1004 dprintk("Server FSID: %llx:%llx\n", 1005 (unsigned long long) server->fsid.major, 1006 (unsigned long long) server->fsid.minor); 1007 dprintk("Mount FH: %d\n", mntfh->size); 1008 1009 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1010 if (error < 0) 1011 goto error; 1012 1013 BUG_ON(!server->nfs_client); 1014 BUG_ON(!server->nfs_client->rpc_ops); 1015 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1016 1017 spin_lock(&nfs_client_lock); 1018 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1019 list_add_tail(&server->master_link, &nfs_volume_list); 1020 spin_unlock(&nfs_client_lock); 1021 1022 server->mount_time = jiffies; 1023 dprintk("<-- nfs4_create_server() = %p\n", server); 1024 return server; 1025 1026error: 1027 nfs_free_server(server); 1028 dprintk("<-- nfs4_create_server() = error %d\n", error); 1029 return ERR_PTR(error); 1030} 1031 1032/* 1033 * Create an NFS4 referral server record 1034 */ 1035struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1036 struct nfs_fh *mntfh) 1037{ 1038 struct nfs_client *parent_client; 1039 struct nfs_server *server, *parent_server; 1040 struct nfs_fattr fattr; 1041 int error; 1042 1043 dprintk("--> nfs4_create_referral_server()\n"); 1044 1045 server = nfs_alloc_server(); 1046 if (!server) 1047 return ERR_PTR(-ENOMEM); 1048 1049 parent_server = NFS_SB(data->sb); 1050 parent_client = parent_server->nfs_client; 1051 1052 /* Get a client representation. 1053 * Note: NFSv4 always uses TCP, */ 1054 error = nfs4_set_client(server, data->hostname, data->addr, 1055 parent_client->cl_ipaddr, 1056 data->authflavor, 1057 parent_server->client->cl_xprt->prot, 1058 parent_client->retrans_timeo, 1059 parent_client->retrans_count); 1060 if (error < 0) 1061 goto error; 1062 1063 /* Initialise the client representation from the parent server */ 1064 nfs_server_copy_userdata(server, parent_server); 1065 server->caps |= NFS_CAP_ATOMIC_OPEN; 1066 1067 error = nfs_init_server_rpcclient(server, data->authflavor); 1068 if (error < 0) 1069 goto error; 1070 1071 BUG_ON(!server->nfs_client); 1072 BUG_ON(!server->nfs_client->rpc_ops); 1073 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1074 1075 /* Probe the root fh to retrieve its FSID and filehandle */ 1076 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1077 if (error < 0) 1078 goto error; 1079 1080 /* probe the filesystem info for this server filesystem */ 1081 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1082 if (error < 0) 1083 goto error; 1084 1085 dprintk("Referral FSID: %llx:%llx\n", 1086 (unsigned long long) server->fsid.major, 1087 (unsigned long long) server->fsid.minor); 1088 1089 spin_lock(&nfs_client_lock); 1090 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1091 list_add_tail(&server->master_link, &nfs_volume_list); 1092 spin_unlock(&nfs_client_lock); 1093 1094 server->mount_time = jiffies; 1095 1096 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1097 return server; 1098 1099error: 1100 nfs_free_server(server); 1101 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1102 return ERR_PTR(error); 1103} 1104 1105#endif /* CONFIG_NFS_V4 */ 1106 1107/* 1108 * Clone an NFS2, NFS3 or NFS4 server record 1109 */ 1110struct nfs_server *nfs_clone_server(struct nfs_server *source, 1111 struct nfs_fh *fh, 1112 struct nfs_fattr *fattr) 1113{ 1114 struct nfs_server *server; 1115 struct nfs_fattr fattr_fsinfo; 1116 int error; 1117 1118 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1119 (unsigned long long) fattr->fsid.major, 1120 (unsigned long long) fattr->fsid.minor); 1121 1122 server = nfs_alloc_server(); 1123 if (!server) 1124 return ERR_PTR(-ENOMEM); 1125 1126 /* Copy data from the source */ 1127 server->nfs_client = source->nfs_client; 1128 atomic_inc(&server->nfs_client->cl_count); 1129 nfs_server_copy_userdata(server, source); 1130 1131 server->fsid = fattr->fsid; 1132 1133 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor); 1134 if (error < 0) 1135 goto out_free_server; 1136 if (!IS_ERR(source->client_acl)) 1137 nfs_init_server_aclclient(server); 1138 1139 /* probe the filesystem info for this server filesystem */ 1140 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1141 if (error < 0) 1142 goto out_free_server; 1143 1144 dprintk("Cloned FSID: %llx:%llx\n", 1145 (unsigned long long) server->fsid.major, 1146 (unsigned long long) server->fsid.minor); 1147 1148 error = nfs_start_lockd(server); 1149 if (error < 0) 1150 goto out_free_server; 1151 1152 spin_lock(&nfs_client_lock); 1153 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1154 list_add_tail(&server->master_link, &nfs_volume_list); 1155 spin_unlock(&nfs_client_lock); 1156 1157 server->mount_time = jiffies; 1158 1159 dprintk("<-- nfs_clone_server() = %p\n", server); 1160 return server; 1161 1162out_free_server: 1163 nfs_free_server(server); 1164 dprintk("<-- nfs_clone_server() = error %d\n", error); 1165 return ERR_PTR(error); 1166} 1167 1168#ifdef CONFIG_PROC_FS 1169static struct proc_dir_entry *proc_fs_nfs; 1170 1171static int nfs_server_list_open(struct inode *inode, struct file *file); 1172static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1173static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1174static void nfs_server_list_stop(struct seq_file *p, void *v); 1175static int nfs_server_list_show(struct seq_file *m, void *v); 1176 1177static struct seq_operations nfs_server_list_ops = { 1178 .start = nfs_server_list_start, 1179 .next = nfs_server_list_next, 1180 .stop = nfs_server_list_stop, 1181 .show = nfs_server_list_show, 1182}; 1183 1184static const struct file_operations nfs_server_list_fops = { 1185 .open = nfs_server_list_open, 1186 .read = seq_read, 1187 .llseek = seq_lseek, 1188 .release = seq_release, 1189}; 1190 1191static int nfs_volume_list_open(struct inode *inode, struct file *file); 1192static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1193static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1194static void nfs_volume_list_stop(struct seq_file *p, void *v); 1195static int nfs_volume_list_show(struct seq_file *m, void *v); 1196 1197static struct seq_operations nfs_volume_list_ops = { 1198 .start = nfs_volume_list_start, 1199 .next = nfs_volume_list_next, 1200 .stop = nfs_volume_list_stop, 1201 .show = nfs_volume_list_show, 1202}; 1203 1204static const struct file_operations nfs_volume_list_fops = { 1205 .open = nfs_volume_list_open, 1206 .read = seq_read, 1207 .llseek = seq_lseek, 1208 .release = seq_release, 1209}; 1210 1211/* 1212 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1213 * we're dealing 1214 */ 1215static int nfs_server_list_open(struct inode *inode, struct file *file) 1216{ 1217 struct seq_file *m; 1218 int ret; 1219 1220 ret = seq_open(file, &nfs_server_list_ops); 1221 if (ret < 0) 1222 return ret; 1223 1224 m = file->private_data; 1225 m->private = PDE(inode)->data; 1226 1227 return 0; 1228} 1229 1230/* 1231 * set up the iterator to start reading from the server list and return the first item 1232 */ 1233static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1234{ 1235 struct list_head *_p; 1236 loff_t pos = *_pos; 1237 1238 /* lock the list against modification */ 1239 spin_lock(&nfs_client_lock); 1240 1241 /* allow for the header line */ 1242 if (!pos) 1243 return SEQ_START_TOKEN; 1244 pos--; 1245 1246 /* find the n'th element in the list */ 1247 list_for_each(_p, &nfs_client_list) 1248 if (!pos--) 1249 break; 1250 1251 return _p != &nfs_client_list ? _p : NULL; 1252} 1253 1254/* 1255 * move to next server 1256 */ 1257static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1258{ 1259 struct list_head *_p; 1260 1261 (*pos)++; 1262 1263 _p = v; 1264 _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next; 1265 1266 return _p != &nfs_client_list ? _p : NULL; 1267} 1268 1269/* 1270 * clean up after reading from the transports list 1271 */ 1272static void nfs_server_list_stop(struct seq_file *p, void *v) 1273{ 1274 spin_unlock(&nfs_client_lock); 1275} 1276 1277/* 1278 * display a header line followed by a load of call lines 1279 */ 1280static int nfs_server_list_show(struct seq_file *m, void *v) 1281{ 1282 struct nfs_client *clp; 1283 1284 /* display header on line 1 */ 1285 if (v == SEQ_START_TOKEN) { 1286 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1287 return 0; 1288 } 1289 1290 /* display one transport per line on subsequent lines */ 1291 clp = list_entry(v, struct nfs_client, cl_share_link); 1292 1293 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n", 1294 clp->cl_nfsversion, 1295 NIPQUAD(clp->cl_addr.sin_addr), 1296 ntohs(clp->cl_addr.sin_port), 1297 atomic_read(&clp->cl_count), 1298 clp->cl_hostname); 1299 1300 return 0; 1301} 1302 1303/* 1304 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1305 */ 1306static int nfs_volume_list_open(struct inode *inode, struct file *file) 1307{ 1308 struct seq_file *m; 1309 int ret; 1310 1311 ret = seq_open(file, &nfs_volume_list_ops); 1312 if (ret < 0) 1313 return ret; 1314 1315 m = file->private_data; 1316 m->private = PDE(inode)->data; 1317 1318 return 0; 1319} 1320 1321/* 1322 * set up the iterator to start reading from the volume list and return the first item 1323 */ 1324static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1325{ 1326 struct list_head *_p; 1327 loff_t pos = *_pos; 1328 1329 /* lock the list against modification */ 1330 spin_lock(&nfs_client_lock); 1331 1332 /* allow for the header line */ 1333 if (!pos) 1334 return SEQ_START_TOKEN; 1335 pos--; 1336 1337 /* find the n'th element in the list */ 1338 list_for_each(_p, &nfs_volume_list) 1339 if (!pos--) 1340 break; 1341 1342 return _p != &nfs_volume_list ? _p : NULL; 1343} 1344 1345/* 1346 * move to next volume 1347 */ 1348static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1349{ 1350 struct list_head *_p; 1351 1352 (*pos)++; 1353 1354 _p = v; 1355 _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next; 1356 1357 return _p != &nfs_volume_list ? _p : NULL; 1358} 1359 1360/* 1361 * clean up after reading from the transports list 1362 */ 1363static void nfs_volume_list_stop(struct seq_file *p, void *v) 1364{ 1365 spin_unlock(&nfs_client_lock); 1366} 1367 1368/* 1369 * display a header line followed by a load of call lines 1370 */ 1371static int nfs_volume_list_show(struct seq_file *m, void *v) 1372{ 1373 struct nfs_server *server; 1374 struct nfs_client *clp; 1375 char dev[8], fsid[17]; 1376 1377 /* display header on line 1 */ 1378 if (v == SEQ_START_TOKEN) { 1379 seq_puts(m, "NV SERVER PORT DEV FSID\n"); 1380 return 0; 1381 } 1382 /* display one transport per line on subsequent lines */ 1383 server = list_entry(v, struct nfs_server, master_link); 1384 clp = server->nfs_client; 1385 1386 snprintf(dev, 8, "%u:%u", 1387 MAJOR(server->s_dev), MINOR(server->s_dev)); 1388 1389 snprintf(fsid, 17, "%llx:%llx", 1390 (unsigned long long) server->fsid.major, 1391 (unsigned long long) server->fsid.minor); 1392 1393 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n", 1394 clp->cl_nfsversion, 1395 NIPQUAD(clp->cl_addr.sin_addr), 1396 ntohs(clp->cl_addr.sin_port), 1397 dev, 1398 fsid); 1399 1400 return 0; 1401} 1402 1403/* 1404 * initialise the /proc/fs/nfsfs/ directory 1405 */ 1406int __init nfs_fs_proc_init(void) 1407{ 1408 struct proc_dir_entry *p; 1409 1410 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs); 1411 if (!proc_fs_nfs) 1412 goto error_0; 1413 1414 proc_fs_nfs->owner = THIS_MODULE; 1415 1416 /* a file of servers with which we're dealing */ 1417 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs); 1418 if (!p) 1419 goto error_1; 1420 1421 p->proc_fops = &nfs_server_list_fops; 1422 p->owner = THIS_MODULE; 1423 1424 /* a file of volumes that we have mounted */ 1425 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs); 1426 if (!p) 1427 goto error_2; 1428 1429 p->proc_fops = &nfs_volume_list_fops; 1430 p->owner = THIS_MODULE; 1431 return 0; 1432 1433error_2: 1434 remove_proc_entry("servers", proc_fs_nfs); 1435error_1: 1436 remove_proc_entry("nfsfs", proc_root_fs); 1437error_0: 1438 return -ENOMEM; 1439} 1440 1441/* 1442 * clean up the /proc/fs/nfsfs/ directory 1443 */ 1444void nfs_fs_proc_exit(void) 1445{ 1446 remove_proc_entry("volumes", proc_fs_nfs); 1447 remove_proc_entry("servers", proc_fs_nfs); 1448 remove_proc_entry("nfsfs", proc_root_fs); 1449} 1450 1451#endif /* CONFIG_PROC_FS */ 1452