/fs/nfs/client.c
C | 2077 lines | 1446 code | 334 blank | 297 comment | 223 complexity | 21d5420cd199ab08dc6374caadf99aa4 MD5 | raw file
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 <linux/slab.h> 39#include <linux/idr.h> 40#include <net/ipv6.h> 41#include <linux/nfs_xdr.h> 42#include <linux/sunrpc/bc_xprt.h> 43#include <linux/nsproxy.h> 44#include <linux/pid_namespace.h> 45 46 47#include "nfs4_fs.h" 48#include "callback.h" 49#include "delegation.h" 50#include "iostat.h" 51#include "internal.h" 52#include "fscache.h" 53#include "pnfs.h" 54#include "netns.h" 55 56#define NFSDBG_FACILITY NFSDBG_CLIENT 57 58static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 59#ifdef CONFIG_NFS_V4 60 61/* 62 * Get a unique NFSv4.0 callback identifier which will be used 63 * by the V4.0 callback service to lookup the nfs_client struct 64 */ 65static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 66{ 67 int ret = 0; 68 struct nfs_net *nn = net_generic(clp->net, nfs_net_id); 69 70 if (clp->rpc_ops->version != 4 || minorversion != 0) 71 return ret; 72retry: 73 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL)) 74 return -ENOMEM; 75 spin_lock(&nn->nfs_client_lock); 76 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident); 77 spin_unlock(&nn->nfs_client_lock); 78 if (ret == -EAGAIN) 79 goto retry; 80 return ret; 81} 82#endif /* CONFIG_NFS_V4 */ 83 84/* 85 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS 86 */ 87static bool nfs4_disable_idmapping = true; 88 89/* 90 * RPC cruft for NFS 91 */ 92static const struct rpc_version *nfs_version[5] = { 93 [2] = &nfs_version2, 94#ifdef CONFIG_NFS_V3 95 [3] = &nfs_version3, 96#endif 97#ifdef CONFIG_NFS_V4 98 [4] = &nfs_version4, 99#endif 100}; 101 102const struct rpc_program nfs_program = { 103 .name = "nfs", 104 .number = NFS_PROGRAM, 105 .nrvers = ARRAY_SIZE(nfs_version), 106 .version = nfs_version, 107 .stats = &nfs_rpcstat, 108 .pipe_dir_name = NFS_PIPE_DIRNAME, 109}; 110 111struct rpc_stat nfs_rpcstat = { 112 .program = &nfs_program 113}; 114 115 116#ifdef CONFIG_NFS_V3_ACL 117static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 118static const struct rpc_version *nfsacl_version[] = { 119 [3] = &nfsacl_version3, 120}; 121 122const struct rpc_program nfsacl_program = { 123 .name = "nfsacl", 124 .number = NFS_ACL_PROGRAM, 125 .nrvers = ARRAY_SIZE(nfsacl_version), 126 .version = nfsacl_version, 127 .stats = &nfsacl_rpcstat, 128}; 129#endif /* CONFIG_NFS_V3_ACL */ 130 131struct nfs_client_initdata { 132 const char *hostname; 133 const struct sockaddr *addr; 134 size_t addrlen; 135 const struct nfs_rpc_ops *rpc_ops; 136 int proto; 137 u32 minorversion; 138 struct net *net; 139}; 140 141/* 142 * Allocate a shared client record 143 * 144 * Since these are allocated/deallocated very rarely, we don't 145 * bother putting them in a slab cache... 146 */ 147static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 148{ 149 struct nfs_client *clp; 150 struct rpc_cred *cred; 151 int err = -ENOMEM; 152 153 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 154 goto error_0; 155 156 clp->rpc_ops = cl_init->rpc_ops; 157 158 atomic_set(&clp->cl_count, 1); 159 clp->cl_cons_state = NFS_CS_INITING; 160 161 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 162 clp->cl_addrlen = cl_init->addrlen; 163 164 if (cl_init->hostname) { 165 err = -ENOMEM; 166 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 167 if (!clp->cl_hostname) 168 goto error_cleanup; 169 } 170 171 INIT_LIST_HEAD(&clp->cl_superblocks); 172 clp->cl_rpcclient = ERR_PTR(-EINVAL); 173 174 clp->cl_proto = cl_init->proto; 175 clp->net = get_net(cl_init->net); 176 177#ifdef CONFIG_NFS_V4 178 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 179 if (err) 180 goto error_cleanup; 181 182 spin_lock_init(&clp->cl_lock); 183 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 184 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 185 clp->cl_boot_time = CURRENT_TIME; 186 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 187 clp->cl_minorversion = cl_init->minorversion; 188 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 189#endif 190 cred = rpc_lookup_machine_cred("*"); 191 if (!IS_ERR(cred)) 192 clp->cl_machine_cred = cred; 193 nfs_fscache_get_client_cookie(clp); 194 195 return clp; 196 197error_cleanup: 198 kfree(clp); 199error_0: 200 return ERR_PTR(err); 201} 202 203#ifdef CONFIG_NFS_V4 204#ifdef CONFIG_NFS_V4_1 205static void nfs4_shutdown_session(struct nfs_client *clp) 206{ 207 if (nfs4_has_session(clp)) { 208 nfs4_deviceid_purge_client(clp); 209 nfs4_destroy_session(clp->cl_session); 210 } 211 212} 213#else /* CONFIG_NFS_V4_1 */ 214static void nfs4_shutdown_session(struct nfs_client *clp) 215{ 216} 217#endif /* CONFIG_NFS_V4_1 */ 218 219/* 220 * Destroy the NFS4 callback service 221 */ 222static void nfs4_destroy_callback(struct nfs_client *clp) 223{ 224 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 225 nfs_callback_down(clp->cl_mvops->minor_version); 226} 227 228static void nfs4_shutdown_client(struct nfs_client *clp) 229{ 230 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 231 nfs4_kill_renewd(clp); 232 nfs4_shutdown_session(clp); 233 nfs4_destroy_callback(clp); 234 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 235 nfs_idmap_delete(clp); 236 237 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 238} 239 240/* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 241void nfs_cleanup_cb_ident_idr(struct net *net) 242{ 243 struct nfs_net *nn = net_generic(net, nfs_net_id); 244 245 idr_destroy(&nn->cb_ident_idr); 246} 247 248/* nfs_client_lock held */ 249static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 250{ 251 struct nfs_net *nn = net_generic(clp->net, nfs_net_id); 252 253 if (clp->cl_cb_ident) 254 idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident); 255} 256 257static void pnfs_init_server(struct nfs_server *server) 258{ 259 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 260} 261 262static void nfs4_destroy_server(struct nfs_server *server) 263{ 264 nfs4_purge_state_owners(server); 265} 266 267#else 268static void nfs4_shutdown_client(struct nfs_client *clp) 269{ 270} 271 272void nfs_cleanup_cb_ident_idr(struct net *net) 273{ 274} 275 276static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 277{ 278} 279 280static void pnfs_init_server(struct nfs_server *server) 281{ 282} 283 284#endif /* CONFIG_NFS_V4 */ 285 286/* 287 * Destroy a shared client record 288 */ 289static void nfs_free_client(struct nfs_client *clp) 290{ 291 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 292 293 nfs4_shutdown_client(clp); 294 295 nfs_fscache_release_client_cookie(clp); 296 297 /* -EIO all pending I/O */ 298 if (!IS_ERR(clp->cl_rpcclient)) 299 rpc_shutdown_client(clp->cl_rpcclient); 300 301 if (clp->cl_machine_cred != NULL) 302 put_rpccred(clp->cl_machine_cred); 303 304 put_net(clp->net); 305 kfree(clp->cl_hostname); 306 kfree(clp->server_scope); 307 kfree(clp->impl_id); 308 kfree(clp); 309 310 dprintk("<-- nfs_free_client()\n"); 311} 312 313/* 314 * Release a reference to a shared client record 315 */ 316void nfs_put_client(struct nfs_client *clp) 317{ 318 struct nfs_net *nn; 319 320 if (!clp) 321 return; 322 323 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 324 nn = net_generic(clp->net, nfs_net_id); 325 326 if (atomic_dec_and_lock(&clp->cl_count, &nn->nfs_client_lock)) { 327 list_del(&clp->cl_share_link); 328 nfs_cb_idr_remove_locked(clp); 329 spin_unlock(&nn->nfs_client_lock); 330 331 BUG_ON(!list_empty(&clp->cl_superblocks)); 332 333 nfs_free_client(clp); 334 } 335} 336EXPORT_SYMBOL_GPL(nfs_put_client); 337 338#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 339/* 340 * Test if two ip6 socket addresses refer to the same socket by 341 * comparing relevant fields. The padding bytes specifically, are not 342 * compared. sin6_flowinfo is not compared because it only affects QoS 343 * and sin6_scope_id is only compared if the address is "link local" 344 * because "link local" addresses need only be unique to a specific 345 * link. Conversely, ordinary unicast addresses might have different 346 * sin6_scope_id. 347 * 348 * The caller should ensure both socket addresses are AF_INET6. 349 */ 350static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 351 const struct sockaddr *sa2) 352{ 353 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 354 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 355 356 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 357 return 0; 358 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 359 return sin1->sin6_scope_id == sin2->sin6_scope_id; 360 361 return 1; 362} 363#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 364static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 365 const struct sockaddr *sa2) 366{ 367 return 0; 368} 369#endif 370 371/* 372 * Test if two ip4 socket addresses refer to the same socket, by 373 * comparing relevant fields. The padding bytes specifically, are 374 * not compared. 375 * 376 * The caller should ensure both socket addresses are AF_INET. 377 */ 378static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 379 const struct sockaddr *sa2) 380{ 381 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 382 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 383 384 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 385} 386 387static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 388 const struct sockaddr *sa2) 389{ 390 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 391 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 392 393 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 394 (sin1->sin6_port == sin2->sin6_port); 395} 396 397static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 398 const struct sockaddr *sa2) 399{ 400 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 401 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 402 403 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 404 (sin1->sin_port == sin2->sin_port); 405} 406 407#if defined(CONFIG_NFS_V4_1) 408/* 409 * Test if two socket addresses represent the same actual socket, 410 * by comparing (only) relevant fields, excluding the port number. 411 */ 412static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 413 const struct sockaddr *sa2) 414{ 415 if (sa1->sa_family != sa2->sa_family) 416 return 0; 417 418 switch (sa1->sa_family) { 419 case AF_INET: 420 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 421 case AF_INET6: 422 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 423 } 424 return 0; 425} 426#endif /* CONFIG_NFS_V4_1 */ 427 428/* 429 * Test if two socket addresses represent the same actual socket, 430 * by comparing (only) relevant fields, including the port number. 431 */ 432static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 433 const struct sockaddr *sa2) 434{ 435 if (sa1->sa_family != sa2->sa_family) 436 return 0; 437 438 switch (sa1->sa_family) { 439 case AF_INET: 440 return nfs_sockaddr_cmp_ip4(sa1, sa2); 441 case AF_INET6: 442 return nfs_sockaddr_cmp_ip6(sa1, sa2); 443 } 444 return 0; 445} 446 447#if defined(CONFIG_NFS_V4_1) 448/* Common match routine for v4.0 and v4.1 callback services */ 449static bool nfs4_cb_match_client(const struct sockaddr *addr, 450 struct nfs_client *clp, u32 minorversion) 451{ 452 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 453 454 /* Don't match clients that failed to initialise */ 455 if (!(clp->cl_cons_state == NFS_CS_READY || 456 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 457 return false; 458 459 /* Match the version and minorversion */ 460 if (clp->rpc_ops->version != 4 || 461 clp->cl_minorversion != minorversion) 462 return false; 463 464 /* Match only the IP address, not the port number */ 465 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 466 return false; 467 468 return true; 469} 470#endif /* CONFIG_NFS_V4_1 */ 471 472/* 473 * Find an nfs_client on the list that matches the initialisation data 474 * that is supplied. 475 */ 476static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 477{ 478 struct nfs_client *clp; 479 const struct sockaddr *sap = data->addr; 480 struct nfs_net *nn = net_generic(data->net, nfs_net_id); 481 482 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 483 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 484 /* Don't match clients that failed to initialise properly */ 485 if (clp->cl_cons_state < 0) 486 continue; 487 488 /* Different NFS versions cannot share the same nfs_client */ 489 if (clp->rpc_ops != data->rpc_ops) 490 continue; 491 492 if (clp->cl_proto != data->proto) 493 continue; 494 /* Match nfsv4 minorversion */ 495 if (clp->cl_minorversion != data->minorversion) 496 continue; 497 /* Match the full socket address */ 498 if (!nfs_sockaddr_cmp(sap, clap)) 499 continue; 500 501 atomic_inc(&clp->cl_count); 502 return clp; 503 } 504 return NULL; 505} 506 507/* 508 * Look up a client by IP address and protocol version 509 * - creates a new record if one doesn't yet exist 510 */ 511static struct nfs_client * 512nfs_get_client(const struct nfs_client_initdata *cl_init, 513 const struct rpc_timeout *timeparms, 514 const char *ip_addr, 515 rpc_authflavor_t authflavour, 516 int noresvport) 517{ 518 struct nfs_client *clp, *new = NULL; 519 int error; 520 struct nfs_net *nn = net_generic(cl_init->net, nfs_net_id); 521 522 dprintk("--> nfs_get_client(%s,v%u)\n", 523 cl_init->hostname ?: "", cl_init->rpc_ops->version); 524 525 /* see if the client already exists */ 526 do { 527 spin_lock(&nn->nfs_client_lock); 528 529 clp = nfs_match_client(cl_init); 530 if (clp) 531 goto found_client; 532 if (new) 533 goto install_client; 534 535 spin_unlock(&nn->nfs_client_lock); 536 537 new = nfs_alloc_client(cl_init); 538 } while (!IS_ERR(new)); 539 540 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 541 return new; 542 543 /* install a new client and return with it unready */ 544install_client: 545 clp = new; 546 list_add(&clp->cl_share_link, &nn->nfs_client_list); 547 spin_unlock(&nn->nfs_client_lock); 548 549 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, 550 authflavour, noresvport); 551 if (error < 0) { 552 nfs_put_client(clp); 553 return ERR_PTR(error); 554 } 555 dprintk("--> nfs_get_client() = %p [new]\n", clp); 556 return clp; 557 558 /* found an existing client 559 * - make sure it's ready before returning 560 */ 561found_client: 562 spin_unlock(&nn->nfs_client_lock); 563 564 if (new) 565 nfs_free_client(new); 566 567 error = wait_event_killable(nfs_client_active_wq, 568 clp->cl_cons_state < NFS_CS_INITING); 569 if (error < 0) { 570 nfs_put_client(clp); 571 return ERR_PTR(-ERESTARTSYS); 572 } 573 574 if (clp->cl_cons_state < NFS_CS_READY) { 575 error = clp->cl_cons_state; 576 nfs_put_client(clp); 577 return ERR_PTR(error); 578 } 579 580 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 581 582 dprintk("--> nfs_get_client() = %p [share]\n", clp); 583 return clp; 584} 585 586/* 587 * Mark a server as ready or failed 588 */ 589void nfs_mark_client_ready(struct nfs_client *clp, int state) 590{ 591 clp->cl_cons_state = state; 592 wake_up_all(&nfs_client_active_wq); 593} 594 595/* 596 * With sessions, the client is not marked ready until after a 597 * successful EXCHANGE_ID and CREATE_SESSION. 598 * 599 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 600 * other versions of NFS can be tried. 601 */ 602int nfs4_check_client_ready(struct nfs_client *clp) 603{ 604 if (!nfs4_has_session(clp)) 605 return 0; 606 if (clp->cl_cons_state < NFS_CS_READY) 607 return -EPROTONOSUPPORT; 608 return 0; 609} 610 611/* 612 * Initialise the timeout values for a connection 613 */ 614static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 615 unsigned int timeo, unsigned int retrans) 616{ 617 to->to_initval = timeo * HZ / 10; 618 to->to_retries = retrans; 619 620 switch (proto) { 621 case XPRT_TRANSPORT_TCP: 622 case XPRT_TRANSPORT_RDMA: 623 if (to->to_retries == 0) 624 to->to_retries = NFS_DEF_TCP_RETRANS; 625 if (to->to_initval == 0) 626 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 627 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 628 to->to_initval = NFS_MAX_TCP_TIMEOUT; 629 to->to_increment = to->to_initval; 630 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 631 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 632 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 633 if (to->to_maxval < to->to_initval) 634 to->to_maxval = to->to_initval; 635 to->to_exponential = 0; 636 break; 637 case XPRT_TRANSPORT_UDP: 638 if (to->to_retries == 0) 639 to->to_retries = NFS_DEF_UDP_RETRANS; 640 if (!to->to_initval) 641 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 642 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 643 to->to_initval = NFS_MAX_UDP_TIMEOUT; 644 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 645 to->to_exponential = 1; 646 break; 647 default: 648 BUG(); 649 } 650} 651 652/* 653 * Create an RPC client handle 654 */ 655static int nfs_create_rpc_client(struct nfs_client *clp, 656 const struct rpc_timeout *timeparms, 657 rpc_authflavor_t flavor, 658 int discrtry, int noresvport) 659{ 660 struct rpc_clnt *clnt = NULL; 661 struct rpc_create_args args = { 662 .net = clp->net, 663 .protocol = clp->cl_proto, 664 .address = (struct sockaddr *)&clp->cl_addr, 665 .addrsize = clp->cl_addrlen, 666 .timeout = timeparms, 667 .servername = clp->cl_hostname, 668 .program = &nfs_program, 669 .version = clp->rpc_ops->version, 670 .authflavor = flavor, 671 }; 672 673 if (discrtry) 674 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 675 if (noresvport) 676 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 677 678 if (!IS_ERR(clp->cl_rpcclient)) 679 return 0; 680 681 clnt = rpc_create(&args); 682 if (IS_ERR(clnt)) { 683 dprintk("%s: cannot create RPC client. Error = %ld\n", 684 __func__, PTR_ERR(clnt)); 685 return PTR_ERR(clnt); 686 } 687 688 clp->cl_rpcclient = clnt; 689 return 0; 690} 691 692/* 693 * Version 2 or 3 client destruction 694 */ 695static void nfs_destroy_server(struct nfs_server *server) 696{ 697 if (server->nlm_host) 698 nlmclnt_done(server->nlm_host); 699} 700 701/* 702 * Version 2 or 3 lockd setup 703 */ 704static int nfs_start_lockd(struct nfs_server *server) 705{ 706 struct nlm_host *host; 707 struct nfs_client *clp = server->nfs_client; 708 struct nlmclnt_initdata nlm_init = { 709 .hostname = clp->cl_hostname, 710 .address = (struct sockaddr *)&clp->cl_addr, 711 .addrlen = clp->cl_addrlen, 712 .nfs_version = clp->rpc_ops->version, 713 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 714 1 : 0, 715 .net = clp->net, 716 }; 717 718 if (nlm_init.nfs_version > 3) 719 return 0; 720 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 721 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 722 return 0; 723 724 switch (clp->cl_proto) { 725 default: 726 nlm_init.protocol = IPPROTO_TCP; 727 break; 728 case XPRT_TRANSPORT_UDP: 729 nlm_init.protocol = IPPROTO_UDP; 730 } 731 732 host = nlmclnt_init(&nlm_init); 733 if (IS_ERR(host)) 734 return PTR_ERR(host); 735 736 server->nlm_host = host; 737 server->destroy = nfs_destroy_server; 738 return 0; 739} 740 741/* 742 * Initialise an NFSv3 ACL client connection 743 */ 744#ifdef CONFIG_NFS_V3_ACL 745static void nfs_init_server_aclclient(struct nfs_server *server) 746{ 747 if (server->nfs_client->rpc_ops->version != 3) 748 goto out_noacl; 749 if (server->flags & NFS_MOUNT_NOACL) 750 goto out_noacl; 751 752 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 753 if (IS_ERR(server->client_acl)) 754 goto out_noacl; 755 756 /* No errors! Assume that Sun nfsacls are supported */ 757 server->caps |= NFS_CAP_ACLS; 758 return; 759 760out_noacl: 761 server->caps &= ~NFS_CAP_ACLS; 762} 763#else 764static inline void nfs_init_server_aclclient(struct nfs_server *server) 765{ 766 server->flags &= ~NFS_MOUNT_NOACL; 767 server->caps &= ~NFS_CAP_ACLS; 768} 769#endif 770 771/* 772 * Create a general RPC client 773 */ 774static int nfs_init_server_rpcclient(struct nfs_server *server, 775 const struct rpc_timeout *timeo, 776 rpc_authflavor_t pseudoflavour) 777{ 778 struct nfs_client *clp = server->nfs_client; 779 780 server->client = rpc_clone_client(clp->cl_rpcclient); 781 if (IS_ERR(server->client)) { 782 dprintk("%s: couldn't create rpc_client!\n", __func__); 783 return PTR_ERR(server->client); 784 } 785 786 memcpy(&server->client->cl_timeout_default, 787 timeo, 788 sizeof(server->client->cl_timeout_default)); 789 server->client->cl_timeout = &server->client->cl_timeout_default; 790 791 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 792 struct rpc_auth *auth; 793 794 auth = rpcauth_create(pseudoflavour, server->client); 795 if (IS_ERR(auth)) { 796 dprintk("%s: couldn't create credcache!\n", __func__); 797 return PTR_ERR(auth); 798 } 799 } 800 server->client->cl_softrtry = 0; 801 if (server->flags & NFS_MOUNT_SOFT) 802 server->client->cl_softrtry = 1; 803 804 return 0; 805} 806 807/* 808 * Initialise an NFS2 or NFS3 client 809 */ 810int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, 811 const char *ip_addr, rpc_authflavor_t authflavour, 812 int noresvport) 813{ 814 int error; 815 816 if (clp->cl_cons_state == NFS_CS_READY) { 817 /* the client is already initialised */ 818 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 819 return 0; 820 } 821 822 /* 823 * Create a client RPC handle for doing FSSTAT with UNIX auth only 824 * - RFC 2623, sec 2.3.2 825 */ 826 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 827 0, noresvport); 828 if (error < 0) 829 goto error; 830 nfs_mark_client_ready(clp, NFS_CS_READY); 831 return 0; 832 833error: 834 nfs_mark_client_ready(clp, error); 835 dprintk("<-- nfs_init_client() = xerror %d\n", error); 836 return error; 837} 838 839/* 840 * Create a version 2 or 3 client 841 */ 842static int nfs_init_server(struct nfs_server *server, 843 const struct nfs_parsed_mount_data *data) 844{ 845 struct nfs_client_initdata cl_init = { 846 .hostname = data->nfs_server.hostname, 847 .addr = (const struct sockaddr *)&data->nfs_server.address, 848 .addrlen = data->nfs_server.addrlen, 849 .rpc_ops = &nfs_v2_clientops, 850 .proto = data->nfs_server.protocol, 851 .net = data->net, 852 }; 853 struct rpc_timeout timeparms; 854 struct nfs_client *clp; 855 int error; 856 857 dprintk("--> nfs_init_server()\n"); 858 859#ifdef CONFIG_NFS_V3 860 if (data->version == 3) 861 cl_init.rpc_ops = &nfs_v3_clientops; 862#endif 863 864 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 865 data->timeo, data->retrans); 866 867 /* Allocate or find a client reference we can use */ 868 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, 869 data->flags & NFS_MOUNT_NORESVPORT); 870 if (IS_ERR(clp)) { 871 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 872 return PTR_ERR(clp); 873 } 874 875 server->nfs_client = clp; 876 877 /* Initialise the client representation from the mount data */ 878 server->flags = data->flags; 879 server->options = data->options; 880 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 881 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 882 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 883 884 if (data->rsize) 885 server->rsize = nfs_block_size(data->rsize, NULL); 886 if (data->wsize) 887 server->wsize = nfs_block_size(data->wsize, NULL); 888 889 server->acregmin = data->acregmin * HZ; 890 server->acregmax = data->acregmax * HZ; 891 server->acdirmin = data->acdirmin * HZ; 892 server->acdirmax = data->acdirmax * HZ; 893 894 /* Start lockd here, before we might error out */ 895 error = nfs_start_lockd(server); 896 if (error < 0) 897 goto error; 898 899 server->port = data->nfs_server.port; 900 901 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 902 if (error < 0) 903 goto error; 904 905 /* Preserve the values of mount_server-related mount options */ 906 if (data->mount_server.addrlen) { 907 memcpy(&server->mountd_address, &data->mount_server.address, 908 data->mount_server.addrlen); 909 server->mountd_addrlen = data->mount_server.addrlen; 910 } 911 server->mountd_version = data->mount_server.version; 912 server->mountd_port = data->mount_server.port; 913 server->mountd_protocol = data->mount_server.protocol; 914 915 server->namelen = data->namlen; 916 /* Create a client RPC handle for the NFSv3 ACL management interface */ 917 nfs_init_server_aclclient(server); 918 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 919 return 0; 920 921error: 922 server->nfs_client = NULL; 923 nfs_put_client(clp); 924 dprintk("<-- nfs_init_server() = xerror %d\n", error); 925 return error; 926} 927 928/* 929 * Load up the server record from information gained in an fsinfo record 930 */ 931static void nfs_server_set_fsinfo(struct nfs_server *server, 932 struct nfs_fh *mntfh, 933 struct nfs_fsinfo *fsinfo) 934{ 935 unsigned long max_rpc_payload; 936 937 /* Work out a lot of parameters */ 938 if (server->rsize == 0) 939 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 940 if (server->wsize == 0) 941 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 942 943 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 944 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 945 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 946 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 947 948 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 949 if (server->rsize > max_rpc_payload) 950 server->rsize = max_rpc_payload; 951 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 952 server->rsize = NFS_MAX_FILE_IO_SIZE; 953 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 954 955 server->backing_dev_info.name = "nfs"; 956 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 957 958 if (server->wsize > max_rpc_payload) 959 server->wsize = max_rpc_payload; 960 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 961 server->wsize = NFS_MAX_FILE_IO_SIZE; 962 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 963 server->pnfs_blksize = fsinfo->blksize; 964 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype); 965 966 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 967 968 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 969 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 970 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 971 if (server->dtsize > server->rsize) 972 server->dtsize = server->rsize; 973 974 if (server->flags & NFS_MOUNT_NOAC) { 975 server->acregmin = server->acregmax = 0; 976 server->acdirmin = server->acdirmax = 0; 977 } 978 979 server->maxfilesize = fsinfo->maxfilesize; 980 981 server->time_delta = fsinfo->time_delta; 982 983 /* We're airborne Set socket buffersize */ 984 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 985} 986 987/* 988 * Probe filesystem information, including the FSID on v2/v3 989 */ 990static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 991{ 992 struct nfs_fsinfo fsinfo; 993 struct nfs_client *clp = server->nfs_client; 994 int error; 995 996 dprintk("--> nfs_probe_fsinfo()\n"); 997 998 if (clp->rpc_ops->set_capabilities != NULL) { 999 error = clp->rpc_ops->set_capabilities(server, mntfh); 1000 if (error < 0) 1001 goto out_error; 1002 } 1003 1004 fsinfo.fattr = fattr; 1005 fsinfo.layouttype = 0; 1006 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 1007 if (error < 0) 1008 goto out_error; 1009 1010 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 1011 1012 /* Get some general file system info */ 1013 if (server->namelen == 0) { 1014 struct nfs_pathconf pathinfo; 1015 1016 pathinfo.fattr = fattr; 1017 nfs_fattr_init(fattr); 1018 1019 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 1020 server->namelen = pathinfo.max_namelen; 1021 } 1022 1023 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 1024 return 0; 1025 1026out_error: 1027 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1028 return error; 1029} 1030 1031/* 1032 * Copy useful information when duplicating a server record 1033 */ 1034static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1035{ 1036 target->flags = source->flags; 1037 target->rsize = source->rsize; 1038 target->wsize = source->wsize; 1039 target->acregmin = source->acregmin; 1040 target->acregmax = source->acregmax; 1041 target->acdirmin = source->acdirmin; 1042 target->acdirmax = source->acdirmax; 1043 target->caps = source->caps; 1044 target->options = source->options; 1045} 1046 1047static void nfs_server_insert_lists(struct nfs_server *server) 1048{ 1049 struct nfs_client *clp = server->nfs_client; 1050 struct nfs_net *nn = net_generic(clp->net, nfs_net_id); 1051 1052 spin_lock(&nn->nfs_client_lock); 1053 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1054 list_add_tail(&server->master_link, &nn->nfs_volume_list); 1055 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1056 spin_unlock(&nn->nfs_client_lock); 1057 1058} 1059 1060static void nfs_server_remove_lists(struct nfs_server *server) 1061{ 1062 struct nfs_client *clp = server->nfs_client; 1063 struct nfs_net *nn; 1064 1065 if (clp == NULL) 1066 return; 1067 nn = net_generic(clp->net, nfs_net_id); 1068 spin_lock(&nn->nfs_client_lock); 1069 list_del_rcu(&server->client_link); 1070 if (list_empty(&clp->cl_superblocks)) 1071 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1072 list_del(&server->master_link); 1073 spin_unlock(&nn->nfs_client_lock); 1074 1075 synchronize_rcu(); 1076} 1077 1078/* 1079 * Allocate and initialise a server record 1080 */ 1081static struct nfs_server *nfs_alloc_server(void) 1082{ 1083 struct nfs_server *server; 1084 1085 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1086 if (!server) 1087 return NULL; 1088 1089 server->client = server->client_acl = ERR_PTR(-EINVAL); 1090 1091 /* Zero out the NFS state stuff */ 1092 INIT_LIST_HEAD(&server->client_link); 1093 INIT_LIST_HEAD(&server->master_link); 1094 INIT_LIST_HEAD(&server->delegations); 1095 INIT_LIST_HEAD(&server->layouts); 1096 INIT_LIST_HEAD(&server->state_owners_lru); 1097 1098 atomic_set(&server->active, 0); 1099 1100 server->io_stats = nfs_alloc_iostats(); 1101 if (!server->io_stats) { 1102 kfree(server); 1103 return NULL; 1104 } 1105 1106 if (bdi_init(&server->backing_dev_info)) { 1107 nfs_free_iostats(server->io_stats); 1108 kfree(server); 1109 return NULL; 1110 } 1111 1112 ida_init(&server->openowner_id); 1113 ida_init(&server->lockowner_id); 1114 pnfs_init_server(server); 1115 1116 return server; 1117} 1118 1119/* 1120 * Free up a server record 1121 */ 1122void nfs_free_server(struct nfs_server *server) 1123{ 1124 dprintk("--> nfs_free_server()\n"); 1125 1126 nfs_server_remove_lists(server); 1127 unset_pnfs_layoutdriver(server); 1128 1129 if (server->destroy != NULL) 1130 server->destroy(server); 1131 1132 if (!IS_ERR(server->client_acl)) 1133 rpc_shutdown_client(server->client_acl); 1134 if (!IS_ERR(server->client)) 1135 rpc_shutdown_client(server->client); 1136 1137 nfs_put_client(server->nfs_client); 1138 1139 ida_destroy(&server->lockowner_id); 1140 ida_destroy(&server->openowner_id); 1141 nfs_free_iostats(server->io_stats); 1142 bdi_destroy(&server->backing_dev_info); 1143 kfree(server); 1144 nfs_release_automount_timer(); 1145 dprintk("<-- nfs_free_server()\n"); 1146} 1147 1148/* 1149 * Create a version 2 or 3 volume record 1150 * - keyed on server and FSID 1151 */ 1152struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1153 struct nfs_fh *mntfh) 1154{ 1155 struct nfs_server *server; 1156 struct nfs_fattr *fattr; 1157 int error; 1158 1159 server = nfs_alloc_server(); 1160 if (!server) 1161 return ERR_PTR(-ENOMEM); 1162 1163 error = -ENOMEM; 1164 fattr = nfs_alloc_fattr(); 1165 if (fattr == NULL) 1166 goto error; 1167 1168 /* Get a client representation */ 1169 error = nfs_init_server(server, data); 1170 if (error < 0) 1171 goto error; 1172 1173 BUG_ON(!server->nfs_client); 1174 BUG_ON(!server->nfs_client->rpc_ops); 1175 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1176 1177 /* Probe the root fh to retrieve its FSID */ 1178 error = nfs_probe_fsinfo(server, mntfh, fattr); 1179 if (error < 0) 1180 goto error; 1181 if (server->nfs_client->rpc_ops->version == 3) { 1182 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1183 server->namelen = NFS3_MAXNAMLEN; 1184 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1185 server->caps |= NFS_CAP_READDIRPLUS; 1186 } else { 1187 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1188 server->namelen = NFS2_MAXNAMLEN; 1189 } 1190 1191 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1192 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1193 if (error < 0) { 1194 dprintk("nfs_create_server: getattr error = %d\n", -error); 1195 goto error; 1196 } 1197 } 1198 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1199 1200 dprintk("Server FSID: %llx:%llx\n", 1201 (unsigned long long) server->fsid.major, 1202 (unsigned long long) server->fsid.minor); 1203 1204 nfs_server_insert_lists(server); 1205 server->mount_time = jiffies; 1206 nfs_free_fattr(fattr); 1207 return server; 1208 1209error: 1210 nfs_free_fattr(fattr); 1211 nfs_free_server(server); 1212 return ERR_PTR(error); 1213} 1214 1215#ifdef CONFIG_NFS_V4 1216/* 1217 * NFSv4.0 callback thread helper 1218 * 1219 * Find a client by callback identifier 1220 */ 1221struct nfs_client * 1222nfs4_find_client_ident(struct net *net, int cb_ident) 1223{ 1224 struct nfs_client *clp; 1225 struct nfs_net *nn = net_generic(net, nfs_net_id); 1226 1227 spin_lock(&nn->nfs_client_lock); 1228 clp = idr_find(&nn->cb_ident_idr, cb_ident); 1229 if (clp) 1230 atomic_inc(&clp->cl_count); 1231 spin_unlock(&nn->nfs_client_lock); 1232 return clp; 1233} 1234 1235#if defined(CONFIG_NFS_V4_1) 1236/* 1237 * NFSv4.1 callback thread helper 1238 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1239 * minorversion, and sessionID 1240 * 1241 * Returns NULL if no such client 1242 */ 1243struct nfs_client * 1244nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 1245 struct nfs4_sessionid *sid) 1246{ 1247 struct nfs_client *clp; 1248 struct nfs_net *nn = net_generic(net, nfs_net_id); 1249 1250 spin_lock(&nn->nfs_client_lock); 1251 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 1252 if (nfs4_cb_match_client(addr, clp, 1) == false) 1253 continue; 1254 1255 if (!nfs4_has_session(clp)) 1256 continue; 1257 1258 /* Match sessionid*/ 1259 if (memcmp(clp->cl_session->sess_id.data, 1260 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1261 continue; 1262 1263 atomic_inc(&clp->cl_count); 1264 spin_unlock(&nn->nfs_client_lock); 1265 return clp; 1266 } 1267 spin_unlock(&nn->nfs_client_lock); 1268 return NULL; 1269} 1270 1271#else /* CONFIG_NFS_V4_1 */ 1272 1273struct nfs_client * 1274nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 1275 struct nfs4_sessionid *sid) 1276{ 1277 return NULL; 1278} 1279#endif /* CONFIG_NFS_V4_1 */ 1280 1281/* 1282 * Initialize the NFS4 callback service 1283 */ 1284static int nfs4_init_callback(struct nfs_client *clp) 1285{ 1286 int error; 1287 1288 if (clp->rpc_ops->version == 4) { 1289 struct rpc_xprt *xprt; 1290 1291 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 1292 1293 if (nfs4_has_session(clp)) { 1294 error = xprt_setup_backchannel(xprt, 1295 NFS41_BC_MIN_CALLBACKS); 1296 if (error < 0) 1297 return error; 1298 } 1299 1300 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 1301 if (error < 0) { 1302 dprintk("%s: failed to start callback. Error = %d\n", 1303 __func__, error); 1304 return error; 1305 } 1306 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1307 } 1308 return 0; 1309} 1310 1311/* 1312 * Initialize the minor version specific parts of an NFS4 client record 1313 */ 1314static int nfs4_init_client_minor_version(struct nfs_client *clp) 1315{ 1316#if defined(CONFIG_NFS_V4_1) 1317 if (clp->cl_mvops->minor_version) { 1318 struct nfs4_session *session = NULL; 1319 /* 1320 * Create the session and mark it expired. 1321 * When a SEQUENCE operation encounters the expired session 1322 * it will do session recovery to initialize it. 1323 */ 1324 session = nfs4_alloc_session(clp); 1325 if (!session) 1326 return -ENOMEM; 1327 1328 clp->cl_session = session; 1329 /* 1330 * The create session reply races with the server back 1331 * channel probe. Mark the client NFS_CS_SESSION_INITING 1332 * so that the client back channel can find the 1333 * nfs_client struct 1334 */ 1335 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1336 } 1337#endif /* CONFIG_NFS_V4_1 */ 1338 1339 return nfs4_init_callback(clp); 1340} 1341 1342/* 1343 * Initialise an NFS4 client record 1344 */ 1345int nfs4_init_client(struct nfs_client *clp, 1346 const struct rpc_timeout *timeparms, 1347 const char *ip_addr, 1348 rpc_authflavor_t authflavour, 1349 int noresvport) 1350{ 1351 char buf[INET6_ADDRSTRLEN + 1]; 1352 int error; 1353 1354 if (clp->cl_cons_state == NFS_CS_READY) { 1355 /* the client is initialised already */ 1356 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1357 return 0; 1358 } 1359 1360 /* Check NFS protocol revision and initialize RPC op vector */ 1361 clp->rpc_ops = &nfs_v4_clientops; 1362 1363 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1364 1, noresvport); 1365 if (error < 0) 1366 goto error; 1367 1368 /* If no clientaddr= option was specified, find a usable cb address */ 1369 if (ip_addr == NULL) { 1370 struct sockaddr_storage cb_addr; 1371 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 1372 1373 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 1374 if (error < 0) 1375 goto error; 1376 error = rpc_ntop(sap, buf, sizeof(buf)); 1377 if (error < 0) 1378 goto error; 1379 ip_addr = (const char *)buf; 1380 } 1381 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1382 1383 error = nfs_idmap_new(clp); 1384 if (error < 0) { 1385 dprintk("%s: failed to create idmapper. Error = %d\n", 1386 __func__, error); 1387 goto error; 1388 } 1389 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1390 1391 error = nfs4_init_client_minor_version(clp); 1392 if (error < 0) 1393 goto error; 1394 1395 if (!nfs4_has_session(clp)) 1396 nfs_mark_client_ready(clp, NFS_CS_READY); 1397 return 0; 1398 1399error: 1400 nfs_mark_client_ready(clp, error); 1401 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1402 return error; 1403} 1404 1405/* 1406 * Set up an NFS4 client 1407 */ 1408static int nfs4_set_client(struct nfs_server *server, 1409 const char *hostname, 1410 const struct sockaddr *addr, 1411 const size_t addrlen, 1412 const char *ip_addr, 1413 rpc_authflavor_t authflavour, 1414 int proto, const struct rpc_timeout *timeparms, 1415 u32 minorversion, struct net *net) 1416{ 1417 struct nfs_client_initdata cl_init = { 1418 .hostname = hostname, 1419 .addr = addr, 1420 .addrlen = addrlen, 1421 .rpc_ops = &nfs_v4_clientops, 1422 .proto = proto, 1423 .minorversion = minorversion, 1424 .net = net, 1425 }; 1426 struct nfs_client *clp; 1427 int error; 1428 1429 dprintk("--> nfs4_set_client()\n"); 1430 1431 /* Allocate or find a client reference we can use */ 1432 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1433 server->flags & NFS_MOUNT_NORESVPORT); 1434 if (IS_ERR(clp)) { 1435 error = PTR_ERR(clp); 1436 goto error; 1437 } 1438 1439 /* 1440 * Query for the lease time on clientid setup or renewal 1441 * 1442 * Note that this will be set on nfs_clients that were created 1443 * only for the DS role and did not set this bit, but now will 1444 * serve a dual role. 1445 */ 1446 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1447 1448 server->nfs_client = clp; 1449 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1450 return 0; 1451error: 1452 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1453 return error; 1454} 1455 1456/* 1457 * Set up a pNFS Data Server client. 1458 * 1459 * Return any existing nfs_client that matches server address,port,version 1460 * and minorversion. 1461 * 1462 * For a new nfs_client, use a soft mount (default), a low retrans and a 1463 * low timeout interval so that if a connection is lost, we retry through 1464 * the MDS. 1465 */ 1466struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1467 const struct sockaddr *ds_addr, 1468 int ds_addrlen, int ds_proto) 1469{ 1470 struct nfs_client_initdata cl_init = { 1471 .addr = ds_addr, 1472 .addrlen = ds_addrlen, 1473 .rpc_ops = &nfs_v4_clientops, 1474 .proto = ds_proto, 1475 .minorversion = mds_clp->cl_minorversion, 1476 .net = mds_clp->net, 1477 }; 1478 struct rpc_timeout ds_timeout = { 1479 .to_initval = 15 * HZ, 1480 .to_maxval = 15 * HZ, 1481 .to_retries = 1, 1482 .to_exponential = 1, 1483 }; 1484 struct nfs_client *clp; 1485 1486 /* 1487 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1488 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1489 * (section 13.1 RFC 5661). 1490 */ 1491 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1492 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1493 1494 dprintk("<-- %s %p\n", __func__, clp); 1495 return clp; 1496} 1497EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1498 1499/* 1500 * Session has been established, and the client marked ready. 1501 * Set the mount rsize and wsize with negotiated fore channel 1502 * attributes which will be bound checked in nfs_server_set_fsinfo. 1503 */ 1504static void nfs4_session_set_rwsize(struct nfs_server *server) 1505{ 1506#ifdef CONFIG_NFS_V4_1 1507 struct nfs4_session *sess; 1508 u32 server_resp_sz; 1509 u32 server_rqst_sz; 1510 1511 if (!nfs4_has_session(server->nfs_client)) 1512 return; 1513 sess = server->nfs_client->cl_session; 1514 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1515 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1516 1517 if (server->rsize > server_resp_sz) 1518 server->rsize = server_resp_sz; 1519 if (server->wsize > server_rqst_sz) 1520 server->wsize = server_rqst_sz; 1521#endif /* CONFIG_NFS_V4_1 */ 1522} 1523 1524static int nfs4_server_common_setup(struct nfs_server *server, 1525 struct nfs_fh *mntfh) 1526{ 1527 struct nfs_fattr *fattr; 1528 int error; 1529 1530 BUG_ON(!server->nfs_client); 1531 BUG_ON(!server->nfs_client->rpc_ops); 1532 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1533 1534 /* data servers support only a subset of NFSv4.1 */ 1535 if (is_ds_only_client(server->nfs_client)) 1536 return -EPROTONOSUPPORT; 1537 1538 fattr = nfs_alloc_fattr(); 1539 if (fattr == NULL) 1540 return -ENOMEM; 1541 1542 /* We must ensure the session is initialised first */ 1543 error = nfs4_init_session(server); 1544 if (error < 0) 1545 goto out; 1546 1547 /* Probe the root fh to retrieve its FSID and filehandle */ 1548 error = nfs4_get_rootfh(server, mntfh); 1549 if (error < 0) 1550 goto out; 1551 1552 dprintk("Server FSID: %llx:%llx\n", 1553 (unsigned long long) server->fsid.major, 1554 (unsigned long long) server->fsid.minor); 1555 dprintk("Mount FH: %d\n", mntfh->size); 1556 1557 nfs4_session_set_rwsize(server); 1558 1559 error = nfs_probe_fsinfo(server, mntfh, fattr); 1560 if (error < 0) 1561 goto out; 1562 1563 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1564 server->namelen = NFS4_MAXNAMLEN; 1565 1566 nfs_server_insert_lists(server); 1567 server->mount_time = jiffies; 1568 server->destroy = nfs4_destroy_server; 1569out: 1570 nfs_free_fattr(fattr); 1571 return error; 1572} 1573 1574/* 1575 * Create a version 4 volume record 1576 */ 1577static int nfs4_init_server(struct nfs_server *server, 1578 const struct nfs_parsed_mount_data *data) 1579{ 1580 struct rpc_timeout timeparms; 1581 int error; 1582 1583 dprintk("--> nfs4_init_server()\n"); 1584 1585 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1586 data->timeo, data->retrans); 1587 1588 /* Initialise the client representation from the mount data */ 1589 server->flags = data->flags; 1590 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1591 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1592 server->caps |= NFS_CAP_READDIRPLUS; 1593 server->options = data->options; 1594 1595 /* Get a client record */ 1596 error = nfs4_set_client(server, 1597 data->nfs_server.hostname, 1598 (const struct sockaddr *)&data->nfs_server.address, 1599 data->nfs_server.addrlen, 1600 data->client_address, 1601 data->auth_flavors[0], 1602 data->nfs_server.protocol, 1603 &timeparms, 1604 data->minorversion, 1605 data->net); 1606 if (error < 0) 1607 goto error; 1608 1609 /* 1610 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1611 * authentication. 1612 */ 1613 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1614 server->caps |= NFS_CAP_UIDGID_NOMAP; 1615 1616 if (data->rsize) 1617 server->rsize = nfs_block_size(data->rsize, NULL); 1618 if (data->wsize) 1619 server->wsize = nfs_block_size(data->wsize, NULL); 1620 1621 server->acregmin = data->acregmin * HZ; 1622 server->acregmax = data->acregmax * HZ; 1623 server->acdirmin = data->acdirmin * HZ; 1624 server->acdirmax = data->acdirmax * HZ; 1625 1626 server->port = data->nfs_server.port; 1627 1628 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1629 1630error: 1631 /* Done */ 1632 dprintk("<-- nfs4_init_server() = %d\n", error); 1633 return error; 1634} 1635 1636/* 1637 * Create a version 4 volume record 1638 * - keyed on server and FSID 1639 */ 1640struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1641 struct nfs_fh *mntfh) 1642{ 1643 struct nfs_server *server; 1644 int error; 1645 1646 dprintk("--> nfs4_create_server()\n"); 1647 1648 server = nfs_alloc_server(); 1649 if (!server) 1650 return ERR_PTR(-ENOMEM); 1651 1652 /* set up the general RPC client */ 1653 error = nfs4_init_server(server, data); 1654 if (error < 0) 1655 goto error; 1656 1657 error = nfs4_server_common_setup(server, mntfh); 1658 if (error < 0) 1659 goto error; 1660 1661 dprintk("<-- nfs4_create_server() = %p\n", server); 1662 return server; 1663 1664error: 1665 nfs_free_server(server); 1666 dprintk("<-- nfs4_create_server() = error %d\n", error); 1667 return ERR_PTR(error); 1668} 1669 1670/* 1671 * Create an NFS4 referral server record 1672 */ 1673struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1674 struct nfs_fh *mntfh) 1675{ 1676 struct nfs_client *parent_client; 1677 struct nfs_server *server, *parent_server; 1678 int error; 1679 1680 dprintk("--> nfs4_create_referral_server()\n"); 1681 1682 server = nfs_alloc_server(); 1683 if (!server) 1684 return ERR_PTR(-ENOMEM); 1685 1686 parent_server = NFS_SB(data->sb); 1687 parent_client = parent_server->nfs_client; 1688 1689 /* Initialise the client representation from the parent server */ 1690 nfs_server_copy_userdata(server, parent_server); 1691 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1692 1693 /* Get a client representation. 1694 * Note: NFSv4 always uses TCP, */ 1695 error = nfs4_set_client(server, data->hostname, 1696 data->addr, 1697 data->addrlen, 1698 parent_client->cl_ipaddr, 1699 data->authflavor, 1700 rpc_protocol(parent_server->client), 1701 parent_server->client->cl_timeout, 1702 parent_client->cl_mvops->minor_version, 1703 parent_client->net); 1704 if (error < 0) 1705 goto error; 1706 1707 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1708 if (error < 0) 1709 goto error; 1710 1711 error = nfs4_server_common_setup(server, mntfh); 1712 if (error < 0) 1713 goto error; 1714 1715 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1716 return server; 1717 1718error: 1719 nfs_free_server(server); 1720 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1721 return ERR_PTR(error); 1722} 1723 1724#endif /* CONFIG_NFS_V4 */ 1725 1726/* 1727 * Clone an NFS2, NFS3 or NFS4 server record 1728 */ 1729struct nfs_server *nfs_clone_server(struct nfs_server *source, 1730 struct nfs_fh *fh, 1731 struct nfs_fattr *fattr, 1732 rpc_authflavor_t flavor) 1733{ 1734 struct nfs_server *server; 1735 struct nfs_fattr *fattr_fsinfo; 1736 int error; 1737 1738 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1739 (unsigned long long) fattr->fsid.major, 1740 (unsigned long long) fattr->fsid.minor); 1741 1742 server = nfs_alloc_server(); 1743 if (!server) 1744 return ERR_PTR(-ENOMEM); 1745 1746 error = -ENOMEM; 1747 fattr_fsinfo = nfs_alloc_fattr(); 1748 if (fattr_fsinfo == NULL) 1749 goto out_free_server; 1750 1751 /* Copy data from the source */ 1752 server->nfs_client = source->nfs_client; 1753 server->destroy = source->destroy; 1754 atomic_inc(&server->nfs_client->cl_count); 1755 nfs_server_copy_userdata(server, source); 1756 1757 server->fsid = fattr->fsid; 1758 1759 error = nfs_init_server_rpcclient(server, 1760 source->client->cl_timeout, 1761 flavor); 1762 if (error < 0) 1763 goto out_free_server; 1764 if (!IS_ERR(source->client_acl)) 1765 nfs_init_server_aclclient(server); 1766 1767 /* probe the filesystem info for this server filesystem */ 1768 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1769 if (error < 0) 1770 goto out_free_server; 1771 1772 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1773 server->namelen = NFS4_MAXNAMLEN; 1774 1775 dprintk("Cloned FSID: %llx:%llx\n", 1776 (unsigned long long) server->fsid.major, 1777 (unsigned long long) server->fsid.minor); 1778 1779 error = nfs_start_lockd(server); 1780 if (error < 0) 1781 goto out_free_server; 1782 1783 nfs_server_insert_lists(server); 1784 server->mount_time = jiffies; 1785 1786 nfs_free_fattr(fattr_fsinfo); 1787 dprintk("<-- nfs_clone_server() = %p\n", server); 1788 return server; 1789 1790out_free_server: 1791 nfs_free_fattr(fattr_fsinfo); 1792 nfs_free_server(server); 1793 dprintk("<-- nfs_clone_server() = error %d\n", error); 1794 return ERR_PTR(error); 1795} 1796 1797void nfs_clients_init(struct net *net) 1798{ 1799 struct nfs_net *nn = net_generic(net, nfs_net_id); 1800 1801 INIT_LIST_HEAD(&nn->nfs_client_list); 1802 INIT_LIST_HEAD(&nn->nfs_volume_list); 1803#ifdef CONFIG_NFS_V4 1804 idr_init(&nn->cb_ident_idr); 1805#endif 1806 spin_lock_init(&nn->nfs_client_lock); 1807} 1808 1809#ifdef CONFIG_PROC_FS 1810static struct proc_dir_entry *proc_fs_nfs; 1811 1812static int nfs_server_list_open(struct inode *inode, struct file *file); 1813static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1814static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1815static void nfs_server_list_stop(struct seq_file *p, void *v); 1816static int nfs_server_list_show(struct seq_file *m, void *v); 1817 1818static const struct seq_operations nfs_server_list_ops = { 1819 .start = nfs_server_list_start, 1820 .next = nfs_server_list_next, 1821 .stop = nfs_server_list_stop, 1822 .show = nfs_server_list_show, 1823}; 1824 1825static const struct file_operations nfs_server_list_fops = { 1826 .open = nfs_server_list_open, 1827 .read = seq_read, 1828 .llseek = seq_lseek, 1829 .release = seq_release, 1830 .owner = THIS_MODULE, 1831}; 1832 1833static int nfs_volume_list_open(struct inode *inode, struct file *file); 1834static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1835static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1836static void nfs_volume_list_stop(struct seq_file *p, void *v); 1837static int nfs_volume_list_show(struct seq_file *m, void *v); 1838 1839static const struct seq_operations nfs_volume_list_ops = { 1840 .start = nfs_volume_list_start, 1841 .next = nfs_volume_list_next, 1842 .stop = nfs_volume_list_stop, 1843 .show = nfs_volume_list_show, 1844}; 1845 1846static const struct file_operations nfs_volume_list_fops = { 1847 .open = nfs_volume_list_open, 1848 .read = seq_read, 1849 .llseek = seq_lseek, 1850 .release = seq_release, 1851 .owner = THIS_MODULE, 1852}; 1853 1854/* 1855 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1856 * we're dealing 1857 */ 1858static int nfs_server_list_open(struct inode *inode, struct file *file) 1859{ 1860 struct seq_file *m; 1861 int ret; 1862 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1863 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1864 1865 ret = seq_open(file, &nfs_server_list_ops); 1866 if (ret < 0) 1867 return ret; 1868 1869 m = file->private_data; 1870 m->private = net; 1871 1872 return 0; 1873} 1874 1875/* 1876 * set up the iterator to start reading from the server list and return the first item 1877 */ 1878static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1879{ 1880 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1881 1882 /* lock the list against modification */ 1883 spin_lock(&nn->nfs_client_lock); 1884 return seq_list_start_head(&nn->nfs_client_list, *_pos); 1885} 1886 1887/* 1888 * move to next server 1889 */ 1890static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1891{ 1892 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1893 1894 return seq_list_next(v, &nn->nfs_client_list, pos); 1895} 1896 1897/* 1898 * clean up after reading from the transports list 1899 */ 1900static void nfs_server_list_stop(struct seq_file *p, void *v) 1901{ 1902 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1903 1904 spin_unlock(&nn->nfs_client_lock); 1905} 1906 1907/* 1908 * display a header line followed by a load of call lines 1909 */ 1910static int nfs_server_list_show(struct seq_file *m, void *v) 1911{ 1912 struct nfs_client *clp; 1913 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1914 1915 /* display header on line 1 */ 1916 if (v == &nn->nfs_client_list) { 1917 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1918 return 0; 1919 } 1920 1921 /* display one transport per line on subsequent lines */ 1922 clp = list_entry(v, struct nfs_client, cl_share_link); 1923 1924 /* Check if the client is initialized */ 1925 if (clp->cl_cons_state != NFS_CS_READY) 1926 return 0; 1927 1928 rcu_read_lock(); 1929 seq_printf(m, "v%u %s %s %3d %s\n", 1930 clp->rpc_ops->version, 1931 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1932 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1933 atomic_read(&clp->cl_count), 1934 clp->cl_hostname); 1935 rcu_read_unlock(); 1936 1937 return 0; 1938} 1939 1940/* 1941 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1942 */ 1943static int nfs_volume_list_open(struct inode *inode, struct file *file) 1944{ 1945 struct seq_file *m; 1946 int ret; 1947 struct pid_namespace *pid_ns = file->f_dentry->d_sb->s_fs_info; 1948 struct net *net = pid_ns->child_reaper->nsproxy->net_ns; 1949 1950 ret = seq_open(file, &nfs_volume_list_ops); 1951 if (ret < 0) 1952 return ret; 1953 1954 m = file->private_data; 1955 m->private = net; 1956 1957 return 0; 1958} 1959 1960/* 1961 * set up the iterator to start reading from the volume list and return the first item 1962 */ 1963static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1964{ 1965 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 1966 1967 /* lock the list against modification */ 1968 spin_lock(&nn->nfs_client_lock); 1969 return seq_list_start_head(&nn->nfs_volume_list, *_pos); 1970} 1971 1972/* 1973 * move to next volume 1974 */ 1975static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1976{ 1977 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1978 1979 return seq_list_next(v, &nn->nfs_volume_list, pos); 1980} 1981 1982/* 1983 * clean up after reading from the transports list 1984 */ 1985static void nfs_volume_list_stop(struct seq_file *p, void *v) 1986{ 1987 struct nfs_net *nn = net_generic(p->private, nfs_net_id); 1988 1989 spin_unlock(&nn->nfs_client_lock); 1990} 1991 1992/* 1993 * display a header line followed by a load of call lines 1994 */ 1995static int nfs_volume_list_show(struct seq_file *m, void *v) 1996{ 1997 struct nfs_server *server; 1998 struct nfs_client *clp; 1999 char dev[8], fsid[17]; 2000 struct nfs_net *nn = net_generic(m->private, nfs_net_id); 2001 2002 /* display header on line 1 */ 2003 if (v == &nn->nfs_volume_list) { 2004 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 2005 return 0; 2006 } 2007 /* display one transport per line on subsequent lines */ 2008 server = list_entry(v, struct nfs_server, master_link); 2009 clp = server->nfs_client; 2010 2011 snprintf(dev, 8, "%u:%u", 2012 MAJOR(server->s_dev), MINOR(server->s_dev)); 2013 2014 snprintf(fsid, 17, "%llx:%llx", 2015 (unsigned long long) server->fsid.major, 2016 (unsigned long long) server->fsid.minor); 2017 2018 rcu_read_lock(); 2019 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 2020 clp->rpc_ops->version, 2021 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 2022 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 2023 dev, 2024 fsid, 2025 nfs_server_fscache_state(server)); 2026 rcu_read_unlock(); 2027 2028 return 0; 2029} 2030 2031/* 2032 * initialise the /proc/fs/nfsfs/ directory 2033 */ 2034int __init nfs_fs_proc_init(void) 2035{ 2036 struct proc_dir_entry *p; 2037 2038 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 2039 if (!proc_fs_nfs) 2040 goto error_0; 2041 2042 /* a file of servers with which we're dealing */ 2043 p = proc_create("servers", S_IFREG|S_IRUGO, 2044 proc_fs_nfs, &nfs_server_list_fops); 2045 if (!p) 2046 goto error_1; 2047 2048 /* a file of volumes that we have mounted */ 2049 p = proc_create("volumes", S_IFREG|S_IRUGO, 2050 proc_fs_nfs, &nfs_volume_list_fops); 2051 if (!p) 2052 goto error_2; 2053 return 0; 2054 2055error_2: 2056 remove_proc_entry("servers", proc_fs_nfs); 2057error_1: 2058 remove_proc_entry("fs/nfsfs", NULL); 2059error_0: 2060 return -ENOMEM; 2061} 2062 2063/* 2064 * clean up the /proc/fs/nfsfs/ directory 2065 */ 2066void nfs_fs_proc_exit(void) 2067{ 2068 remove_proc_entry("volumes", proc_fs_nfs); 2069 remove_proc_entry("servers", proc_fs_nfs); 2070 remove_proc_entry("fs/nfsfs", NULL); 2071} 2072 2073#endif /* CONFIG_PROC_FS */ 2074 2075module_param(nfs4_disable_idmapping, bool, 0644); 2076MODULE_PARM_DESC(nfs4_disable_idmapping, 2077 "Turn off NFSv4 idmapping when using 'sec=sys'");