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 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/smp_lock.h> 31 #include <linux/seq_file.h> 32 #include <linux/mount.h> 33 #include <linux/nfs_idmap.h> 34 #include <linux/vfs.h> 35 #include <linux/inet.h> 36 #include <linux/nfs_xdr.h> 37 38 #include <asm/system.h> 39 40 #include "nfs4_fs.h" 41 #include "callback.h" 42 #include "delegation.h" 43 #include "iostat.h" 44 #include "internal.h" 45 46 #define NFSDBG_FACILITY NFSDBG_CLIENT 47 48 static DEFINE_SPINLOCK(nfs_client_lock); 49 static LIST_HEAD(nfs_client_list); 50 static LIST_HEAD(nfs_volume_list); 51 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 52 53 /* 54 * RPC cruft for NFS 55 */ 56 static struct rpc_version *nfs_version[5] = { 57 [2] = &nfs_version2, 58 #ifdef CONFIG_NFS_V3 59 [3] = &nfs_version3, 60 #endif 61 #ifdef CONFIG_NFS_V4 62 [4] = &nfs_version4, 63 #endif 64 }; 65 66 struct rpc_program nfs_program = { 67 .name = "nfs", 68 .number = NFS_PROGRAM, 69 .nrvers = ARRAY_SIZE(nfs_version), 70 .version = nfs_version, 71 .stats = &nfs_rpcstat, 72 .pipe_dir_name = "/nfs", 73 }; 74 75 struct rpc_stat nfs_rpcstat = { 76 .program = &nfs_program 77 }; 78 79 80 #ifdef CONFIG_NFS_V3_ACL 81 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 82 static struct rpc_version * nfsacl_version[] = { 83 [3] = &nfsacl_version3, 84 }; 85 86 struct rpc_program nfsacl_program = { 87 .name = "nfsacl", 88 .number = NFS_ACL_PROGRAM, 89 .nrvers = ARRAY_SIZE(nfsacl_version), 90 .version = nfsacl_version, 91 .stats = &nfsacl_rpcstat, 92 }; 93 #endif /* CONFIG_NFS_V3_ACL */ 94 95 /* 96 * Allocate a shared client record 97 * 98 * Since these are allocated/deallocated very rarely, we don't 99 * bother putting them in a slab cache... 100 */ 101 static struct nfs_client *nfs_alloc_client(const char *hostname, 102 const struct sockaddr_in *addr, 103 int nfsversion) 104 { 105 struct nfs_client *clp; 106 int error; 107 108 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 109 goto error_0; 110 111 error = rpciod_up(); 112 if (error < 0) { 113 dprintk("%s: couldn't start rpciod! Error = %d\n", 114 __FUNCTION__, error); 115 goto error_1; 116 } 117 __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state); 118 119 if (nfsversion == 4) { 120 if (nfs_callback_up() < 0) 121 goto error_2; 122 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 123 } 124 125 atomic_set(&clp->cl_count, 1); 126 clp->cl_cons_state = NFS_CS_INITING; 127 128 clp->cl_nfsversion = nfsversion; 129 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr)); 130 131 if (hostname) { 132 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL); 133 if (!clp->cl_hostname) 134 goto error_3; 135 } 136 137 INIT_LIST_HEAD(&clp->cl_superblocks); 138 clp->cl_rpcclient = ERR_PTR(-EINVAL); 139 140 #ifdef CONFIG_NFS_V4 141 init_rwsem(&clp->cl_sem); 142 INIT_LIST_HEAD(&clp->cl_delegations); 143 INIT_LIST_HEAD(&clp->cl_state_owners); 144 INIT_LIST_HEAD(&clp->cl_unused); 145 spin_lock_init(&clp->cl_lock); 146 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 147 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 148 clp->cl_boot_time = CURRENT_TIME; 149 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 150 #endif 151 152 return clp; 153 154 error_3: 155 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 156 nfs_callback_down(); 157 error_2: 158 rpciod_down(); 159 __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state); 160 error_1: 161 kfree(clp); 162 error_0: 163 return NULL; 164 } 165 166 static void nfs4_shutdown_client(struct nfs_client *clp) 167 { 168 #ifdef CONFIG_NFS_V4 169 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 170 nfs4_kill_renewd(clp); 171 while (!list_empty(&clp->cl_unused)) { 172 struct nfs4_state_owner *sp; 173 174 sp = list_entry(clp->cl_unused.next, 175 struct nfs4_state_owner, 176 so_list); 177 list_del(&sp->so_list); 178 kfree(sp); 179 } 180 BUG_ON(!list_empty(&clp->cl_state_owners)); 181 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 182 nfs_idmap_delete(clp); 183 #endif 184 } 185 186 /* 187 * Destroy a shared client record 188 */ 189 static void nfs_free_client(struct nfs_client *clp) 190 { 191 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion); 192 193 nfs4_shutdown_client(clp); 194 195 /* -EIO all pending I/O */ 196 if (!IS_ERR(clp->cl_rpcclient)) 197 rpc_shutdown_client(clp->cl_rpcclient); 198 199 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 200 nfs_callback_down(); 201 202 if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state)) 203 rpciod_down(); 204 205 kfree(clp->cl_hostname); 206 kfree(clp); 207 208 dprintk("<-- nfs_free_client()\n"); 209 } 210 211 /* 212 * Release a reference to a shared client record 213 */ 214 void nfs_put_client(struct nfs_client *clp) 215 { 216 if (!clp) 217 return; 218 219 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 220 221 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 222 list_del(&clp->cl_share_link); 223 spin_unlock(&nfs_client_lock); 224 225 BUG_ON(!list_empty(&clp->cl_superblocks)); 226 227 nfs_free_client(clp); 228 } 229 } 230 231 /* 232 * Find a client by address 233 * - caller must hold nfs_client_lock 234 */ 235 static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port) 236 { 237 struct nfs_client *clp; 238 239 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 240 /* Don't match clients that failed to initialise properly */ 241 if (clp->cl_cons_state < 0) 242 continue; 243 244 /* Different NFS versions cannot share the same nfs_client */ 245 if (clp->cl_nfsversion != nfsversion) 246 continue; 247 248 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr, 249 sizeof(clp->cl_addr.sin_addr)) != 0) 250 continue; 251 252 if (!match_port || clp->cl_addr.sin_port == addr->sin_port) 253 goto found; 254 } 255 256 return NULL; 257 258 found: 259 atomic_inc(&clp->cl_count); 260 return clp; 261 } 262 263 /* 264 * Find a client by IP address and protocol version 265 * - returns NULL if no such client 266 */ 267 struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion) 268 { 269 struct nfs_client *clp; 270 271 spin_lock(&nfs_client_lock); 272 clp = __nfs_find_client(addr, nfsversion, 0); 273 spin_unlock(&nfs_client_lock); 274 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) { 275 nfs_put_client(clp); 276 clp = NULL; 277 } 278 return clp; 279 } 280 281 /* 282 * Look up a client by IP address and protocol version 283 * - creates a new record if one doesn't yet exist 284 */ 285 static struct nfs_client *nfs_get_client(const char *hostname, 286 const struct sockaddr_in *addr, 287 int nfsversion) 288 { 289 struct nfs_client *clp, *new = NULL; 290 int error; 291 292 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n", 293 hostname ?: "", NIPQUAD(addr->sin_addr), 294 addr->sin_port, nfsversion); 295 296 /* see if the client already exists */ 297 do { 298 spin_lock(&nfs_client_lock); 299 300 clp = __nfs_find_client(addr, nfsversion, 1); 301 if (clp) 302 goto found_client; 303 if (new) 304 goto install_client; 305 306 spin_unlock(&nfs_client_lock); 307 308 new = nfs_alloc_client(hostname, addr, nfsversion); 309 } while (new); 310 311 return ERR_PTR(-ENOMEM); 312 313 /* install a new client and return with it unready */ 314 install_client: 315 clp = new; 316 list_add(&clp->cl_share_link, &nfs_client_list); 317 spin_unlock(&nfs_client_lock); 318 dprintk("--> nfs_get_client() = %p [new]\n", clp); 319 return clp; 320 321 /* found an existing client 322 * - make sure it's ready before returning 323 */ 324 found_client: 325 spin_unlock(&nfs_client_lock); 326 327 if (new) 328 nfs_free_client(new); 329 330 error = wait_event_interruptible(nfs_client_active_wq, 331 clp->cl_cons_state != NFS_CS_INITING); 332 if (error < 0) { 333 nfs_put_client(clp); 334 return ERR_PTR(-ERESTARTSYS); 335 } 336 337 if (clp->cl_cons_state < NFS_CS_READY) { 338 error = clp->cl_cons_state; 339 nfs_put_client(clp); 340 return ERR_PTR(error); 341 } 342 343 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 344 345 dprintk("--> nfs_get_client() = %p [share]\n", clp); 346 return clp; 347 } 348 349 /* 350 * Mark a server as ready or failed 351 */ 352 static void nfs_mark_client_ready(struct nfs_client *clp, int state) 353 { 354 clp->cl_cons_state = state; 355 wake_up_all(&nfs_client_active_wq); 356 } 357 358 /* 359 * Initialise the timeout values for a connection 360 */ 361 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 362 unsigned int timeo, unsigned int retrans) 363 { 364 to->to_initval = timeo * HZ / 10; 365 to->to_retries = retrans; 366 if (!to->to_retries) 367 to->to_retries = 2; 368 369 switch (proto) { 370 case IPPROTO_TCP: 371 if (!to->to_initval) 372 to->to_initval = 60 * HZ; 373 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 374 to->to_initval = NFS_MAX_TCP_TIMEOUT; 375 to->to_increment = to->to_initval; 376 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 377 to->to_exponential = 0; 378 break; 379 case IPPROTO_UDP: 380 default: 381 if (!to->to_initval) 382 to->to_initval = 11 * HZ / 10; 383 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 384 to->to_initval = NFS_MAX_UDP_TIMEOUT; 385 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 386 to->to_exponential = 1; 387 break; 388 } 389 } 390 391 /* 392 * Create an RPC client handle 393 */ 394 static int nfs_create_rpc_client(struct nfs_client *clp, int proto, 395 unsigned int timeo, 396 unsigned int retrans, 397 rpc_authflavor_t flavor, 398 int flags) 399 { 400 struct rpc_timeout timeparms; 401 struct rpc_clnt *clnt = NULL; 402 struct rpc_create_args args = { 403 .protocol = proto, 404 .address = (struct sockaddr *)&clp->cl_addr, 405 .addrsize = sizeof(clp->cl_addr), 406 .timeout = &timeparms, 407 .servername = clp->cl_hostname, 408 .program = &nfs_program, 409 .version = clp->rpc_ops->version, 410 .authflavor = flavor, 411 .flags = flags, 412 }; 413 414 if (!IS_ERR(clp->cl_rpcclient)) 415 return 0; 416 417 nfs_init_timeout_values(&timeparms, proto, timeo, retrans); 418 clp->retrans_timeo = timeparms.to_initval; 419 clp->retrans_count = timeparms.to_retries; 420 421 clnt = rpc_create(&args); 422 if (IS_ERR(clnt)) { 423 dprintk("%s: cannot create RPC client. Error = %ld\n", 424 __FUNCTION__, PTR_ERR(clnt)); 425 return PTR_ERR(clnt); 426 } 427 428 clp->cl_rpcclient = clnt; 429 return 0; 430 } 431 432 /* 433 * Version 2 or 3 client destruction 434 */ 435 static void nfs_destroy_server(struct nfs_server *server) 436 { 437 if (!IS_ERR(server->client_acl)) 438 rpc_shutdown_client(server->client_acl); 439 440 if (!(server->flags & NFS_MOUNT_NONLM)) 441 lockd_down(); /* release rpc.lockd */ 442 } 443 444 /* 445 * Version 2 or 3 lockd setup 446 */ 447 static int nfs_start_lockd(struct nfs_server *server) 448 { 449 int error = 0; 450 451 if (server->nfs_client->cl_nfsversion > 3) 452 goto out; 453 if (server->flags & NFS_MOUNT_NONLM) 454 goto out; 455 error = lockd_up((server->flags & NFS_MOUNT_TCP) ? 456 IPPROTO_TCP : IPPROTO_UDP); 457 if (error < 0) 458 server->flags |= NFS_MOUNT_NONLM; 459 else 460 server->destroy = nfs_destroy_server; 461 out: 462 return error; 463 } 464 465 /* 466 * Initialise an NFSv3 ACL client connection 467 */ 468 #ifdef CONFIG_NFS_V3_ACL 469 static void nfs_init_server_aclclient(struct nfs_server *server) 470 { 471 if (server->nfs_client->cl_nfsversion != 3) 472 goto out_noacl; 473 if (server->flags & NFS_MOUNT_NOACL) 474 goto out_noacl; 475 476 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 477 if (IS_ERR(server->client_acl)) 478 goto out_noacl; 479 480 /* No errors! Assume that Sun nfsacls are supported */ 481 server->caps |= NFS_CAP_ACLS; 482 return; 483 484 out_noacl: 485 server->caps &= ~NFS_CAP_ACLS; 486 } 487 #else 488 static inline void nfs_init_server_aclclient(struct nfs_server *server) 489 { 490 server->flags &= ~NFS_MOUNT_NOACL; 491 server->caps &= ~NFS_CAP_ACLS; 492 } 493 #endif 494 495 /* 496 * Create a general RPC client 497 */ 498 static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour) 499 { 500 struct nfs_client *clp = server->nfs_client; 501 502 server->client = rpc_clone_client(clp->cl_rpcclient); 503 if (IS_ERR(server->client)) { 504 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__); 505 return PTR_ERR(server->client); 506 } 507 508 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 509 struct rpc_auth *auth; 510 511 auth = rpcauth_create(pseudoflavour, server->client); 512 if (IS_ERR(auth)) { 513 dprintk("%s: couldn't create credcache!\n", __FUNCTION__); 514 return PTR_ERR(auth); 515 } 516 } 517 server->client->cl_softrtry = 0; 518 if (server->flags & NFS_MOUNT_SOFT) 519 server->client->cl_softrtry = 1; 520 521 server->client->cl_intr = 0; 522 if (server->flags & NFS4_MOUNT_INTR) 523 server->client->cl_intr = 1; 524 525 return 0; 526 } 527 528 /* 529 * Initialise an NFS2 or NFS3 client 530 */ 531 static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data) 532 { 533 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; 534 int error; 535 536 if (clp->cl_cons_state == NFS_CS_READY) { 537 /* the client is already initialised */ 538 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 539 return 0; 540 } 541 542 /* Check NFS protocol revision and initialize RPC op vector */ 543 clp->rpc_ops = &nfs_v2_clientops; 544 #ifdef CONFIG_NFS_V3 545 if (clp->cl_nfsversion == 3) 546 clp->rpc_ops = &nfs_v3_clientops; 547 #endif 548 /* 549 * Create a client RPC handle for doing FSSTAT with UNIX auth only 550 * - RFC 2623, sec 2.3.2 551 */ 552 error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans, 553 RPC_AUTH_UNIX, 0); 554 if (error < 0) 555 goto error; 556 nfs_mark_client_ready(clp, NFS_CS_READY); 557 return 0; 558 559 error: 560 nfs_mark_client_ready(clp, error); 561 dprintk("<-- nfs_init_client() = xerror %d\n", error); 562 return error; 563 } 564 565 /* 566 * Create a version 2 or 3 client 567 */ 568 static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data) 569 { 570 struct nfs_client *clp; 571 int error, nfsvers = 2; 572 573 dprintk("--> nfs_init_server()\n"); 574 575 #ifdef CONFIG_NFS_V3 576 if (data->flags & NFS_MOUNT_VER3) 577 nfsvers = 3; 578 #endif 579 580 /* Allocate or find a client reference we can use */ 581 clp = nfs_get_client(data->hostname, &data->addr, nfsvers); 582 if (IS_ERR(clp)) { 583 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 584 return PTR_ERR(clp); 585 } 586 587 error = nfs_init_client(clp, data); 588 if (error < 0) 589 goto error; 590 591 server->nfs_client = clp; 592 593 /* Initialise the client representation from the mount data */ 594 server->flags = data->flags & NFS_MOUNT_FLAGMASK; 595 596 if (data->rsize) 597 server->rsize = nfs_block_size(data->rsize, NULL); 598 if (data->wsize) 599 server->wsize = nfs_block_size(data->wsize, NULL); 600 601 server->acregmin = data->acregmin * HZ; 602 server->acregmax = data->acregmax * HZ; 603 server->acdirmin = data->acdirmin * HZ; 604 server->acdirmax = data->acdirmax * HZ; 605 606 /* Start lockd here, before we might error out */ 607 error = nfs_start_lockd(server); 608 if (error < 0) 609 goto error; 610 611 error = nfs_init_server_rpcclient(server, data->pseudoflavor); 612 if (error < 0) 613 goto error; 614 615 server->namelen = data->namlen; 616 /* Create a client RPC handle for the NFSv3 ACL management interface */ 617 nfs_init_server_aclclient(server); 618 if (clp->cl_nfsversion == 3) { 619 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 620 server->namelen = NFS3_MAXNAMLEN; 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; 629 630 error: 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 */ 640 static 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 */ 690 static 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; 725 726 out_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 */ 734 static 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 */ 747 static 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 */ 773 void 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 */ 799 struct 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; 847 848 error: 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 */ 857 static 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; 889 890 error: 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 */ 899 static 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; 923 924 error_put: 925 nfs_put_client(clp); 926 error: 927 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 928 return error; 929 } 930 931 /* 932 * Create a version 4 volume record 933 */ 934 static 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 */ 966 struct 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 1026 error: 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 */ 1035 struct 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 1099 error: 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 */ 1110 struct 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 1162 out_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 1169 static struct proc_dir_entry *proc_fs_nfs; 1170 1171 static int nfs_server_list_open(struct inode *inode, struct file *file); 1172 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1173 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1174 static void nfs_server_list_stop(struct seq_file *p, void *v); 1175 static int nfs_server_list_show(struct seq_file *m, void *v); 1176 1177 static 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 1184 static 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 1191 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1192 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1193 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1194 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1195 static int nfs_volume_list_show(struct seq_file *m, void *v); 1196 1197 static 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 1204 static 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 */ 1215 static 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 */ 1233 static 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 */ 1257 static 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 */ 1272 static 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 */ 1280 static 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 */ 1306 static 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 */ 1324 static 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 */ 1348 static 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 */ 1363 static 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 */ 1371 static 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 */ 1406 int __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 1433 error_2: 1434 remove_proc_entry("servers", proc_fs_nfs); 1435 error_1: 1436 remove_proc_entry("nfsfs", proc_root_fs); 1437 error_0: 1438 return -ENOMEM; 1439 } 1440 1441 /* 1442 * clean up the /proc/fs/nfsfs/ directory 1443 */ 1444 void 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