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 <net/ipv6.h> 40#include <linux/nfs_xdr.h> 41#include <linux/sunrpc/bc_xprt.h> 42 43#include <asm/system.h> 44 45#include "nfs4_fs.h" 46#include "callback.h" 47#include "delegation.h" 48#include "iostat.h" 49#include "internal.h" 50#include "fscache.h" 51 52#define NFSDBG_FACILITY NFSDBG_CLIENT 53 54static DEFINE_SPINLOCK(nfs_client_lock); 55static LIST_HEAD(nfs_client_list); 56static LIST_HEAD(nfs_volume_list); 57static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 58 59/* 60 * RPC cruft for NFS 61 */ 62static struct rpc_version *nfs_version[5] = { 63 [2] = &nfs_version2, 64#ifdef CONFIG_NFS_V3 65 [3] = &nfs_version3, 66#endif 67#ifdef CONFIG_NFS_V4 68 [4] = &nfs_version4, 69#endif 70}; 71 72struct rpc_program nfs_program = { 73 .name = "nfs", 74 .number = NFS_PROGRAM, 75 .nrvers = ARRAY_SIZE(nfs_version), 76 .version = nfs_version, 77 .stats = &nfs_rpcstat, 78 .pipe_dir_name = "/nfs", 79}; 80 81struct rpc_stat nfs_rpcstat = { 82 .program = &nfs_program 83}; 84 85 86#ifdef CONFIG_NFS_V3_ACL 87static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 88static struct rpc_version * nfsacl_version[] = { 89 [3] = &nfsacl_version3, 90}; 91 92struct rpc_program nfsacl_program = { 93 .name = "nfsacl", 94 .number = NFS_ACL_PROGRAM, 95 .nrvers = ARRAY_SIZE(nfsacl_version), 96 .version = nfsacl_version, 97 .stats = &nfsacl_rpcstat, 98}; 99#endif /* CONFIG_NFS_V3_ACL */ 100 101struct nfs_client_initdata { 102 const char *hostname; 103 const struct sockaddr *addr; 104 size_t addrlen; 105 const struct nfs_rpc_ops *rpc_ops; 106 int proto; 107 u32 minorversion; 108}; 109 110/* 111 * Allocate a shared client record 112 * 113 * Since these are allocated/deallocated very rarely, we don't 114 * bother putting them in a slab cache... 115 */ 116static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 117{ 118 struct nfs_client *clp; 119 struct rpc_cred *cred; 120 int err = -ENOMEM; 121 122 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 123 goto error_0; 124 125 clp->rpc_ops = cl_init->rpc_ops; 126 127 atomic_set(&clp->cl_count, 1); 128 clp->cl_cons_state = NFS_CS_INITING; 129 130 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 131 clp->cl_addrlen = cl_init->addrlen; 132 133 if (cl_init->hostname) { 134 err = -ENOMEM; 135 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 136 if (!clp->cl_hostname) 137 goto error_cleanup; 138 } 139 140 INIT_LIST_HEAD(&clp->cl_superblocks); 141 clp->cl_rpcclient = ERR_PTR(-EINVAL); 142 143 clp->cl_proto = cl_init->proto; 144 145#ifdef CONFIG_NFS_V4 146 INIT_LIST_HEAD(&clp->cl_delegations); 147 spin_lock_init(&clp->cl_lock); 148 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 149 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 150 clp->cl_boot_time = CURRENT_TIME; 151 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 152 clp->cl_minorversion = cl_init->minorversion; 153 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 154#endif 155 cred = rpc_lookup_machine_cred(); 156 if (!IS_ERR(cred)) 157 clp->cl_machine_cred = cred; 158 159 nfs_fscache_get_client_cookie(clp); 160 161 return clp; 162 163error_cleanup: 164 kfree(clp); 165error_0: 166 return ERR_PTR(err); 167} 168 169#ifdef CONFIG_NFS_V4 170/* 171 * Clears/puts all minor version specific parts from an nfs_client struct 172 * reverting it to minorversion 0. 173 */ 174static void nfs4_clear_client_minor_version(struct nfs_client *clp) 175{ 176#ifdef CONFIG_NFS_V4_1 177 if (nfs4_has_session(clp)) { 178 nfs4_destroy_session(clp->cl_session); 179 clp->cl_session = NULL; 180 } 181 182 clp->cl_mvops = nfs_v4_minor_ops[0]; 183#endif /* CONFIG_NFS_V4_1 */ 184} 185 186/* 187 * Destroy the NFS4 callback service 188 */ 189static void nfs4_destroy_callback(struct nfs_client *clp) 190{ 191 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 192 nfs_callback_down(clp->cl_mvops->minor_version); 193} 194 195static void nfs4_shutdown_client(struct nfs_client *clp) 196{ 197 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 198 nfs4_kill_renewd(clp); 199 nfs4_clear_client_minor_version(clp); 200 nfs4_destroy_callback(clp); 201 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 202 nfs_idmap_delete(clp); 203 204 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 205} 206#else 207static void nfs4_shutdown_client(struct nfs_client *clp) 208{ 209} 210#endif /* CONFIG_NFS_V4 */ 211 212/* 213 * Destroy a shared client record 214 */ 215static void nfs_free_client(struct nfs_client *clp) 216{ 217 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 218 219 nfs4_shutdown_client(clp); 220 221 nfs_fscache_release_client_cookie(clp); 222 223 /* -EIO all pending I/O */ 224 if (!IS_ERR(clp->cl_rpcclient)) 225 rpc_shutdown_client(clp->cl_rpcclient); 226 227 if (clp->cl_machine_cred != NULL) 228 put_rpccred(clp->cl_machine_cred); 229 230 kfree(clp->cl_hostname); 231 kfree(clp); 232 233 dprintk("<-- nfs_free_client()\n"); 234} 235 236/* 237 * Release a reference to a shared client record 238 */ 239void nfs_put_client(struct nfs_client *clp) 240{ 241 if (!clp) 242 return; 243 244 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 245 246 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 247 list_del(&clp->cl_share_link); 248 spin_unlock(&nfs_client_lock); 249 250 BUG_ON(!list_empty(&clp->cl_superblocks)); 251 252 nfs_free_client(clp); 253 } 254} 255 256#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 257/* 258 * Test if two ip6 socket addresses refer to the same socket by 259 * comparing relevant fields. The padding bytes specifically, are not 260 * compared. sin6_flowinfo is not compared because it only affects QoS 261 * and sin6_scope_id is only compared if the address is "link local" 262 * because "link local" addresses need only be unique to a specific 263 * link. Conversely, ordinary unicast addresses might have different 264 * sin6_scope_id. 265 * 266 * The caller should ensure both socket addresses are AF_INET6. 267 */ 268static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 269 const struct sockaddr *sa2) 270{ 271 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 272 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 273 274 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 275 sin1->sin6_scope_id != sin2->sin6_scope_id) 276 return 0; 277 278 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); 279} 280#else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 281static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 282 const struct sockaddr *sa2) 283{ 284 return 0; 285} 286#endif 287 288/* 289 * Test if two ip4 socket addresses refer to the same socket, by 290 * comparing relevant fields. The padding bytes specifically, are 291 * not compared. 292 * 293 * The caller should ensure both socket addresses are AF_INET. 294 */ 295static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 296 const struct sockaddr *sa2) 297{ 298 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 299 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 300 301 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 302} 303 304static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 305 const struct sockaddr *sa2) 306{ 307 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 308 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 309 310 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 311 (sin1->sin6_port == sin2->sin6_port); 312} 313 314static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 315 const struct sockaddr *sa2) 316{ 317 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 318 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 319 320 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 321 (sin1->sin_port == sin2->sin_port); 322} 323 324/* 325 * Test if two socket addresses represent the same actual socket, 326 * by comparing (only) relevant fields, excluding the port number. 327 */ 328static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 329 const struct sockaddr *sa2) 330{ 331 if (sa1->sa_family != sa2->sa_family) 332 return 0; 333 334 switch (sa1->sa_family) { 335 case AF_INET: 336 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 337 case AF_INET6: 338 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 339 } 340 return 0; 341} 342 343/* 344 * Test if two socket addresses represent the same actual socket, 345 * by comparing (only) relevant fields, including the port number. 346 */ 347static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 348 const struct sockaddr *sa2) 349{ 350 if (sa1->sa_family != sa2->sa_family) 351 return 0; 352 353 switch (sa1->sa_family) { 354 case AF_INET: 355 return nfs_sockaddr_cmp_ip4(sa1, sa2); 356 case AF_INET6: 357 return nfs_sockaddr_cmp_ip6(sa1, sa2); 358 } 359 return 0; 360} 361 362/* 363 * Find a client by IP address and protocol version 364 * - returns NULL if no such client 365 */ 366struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 367{ 368 struct nfs_client *clp; 369 370 spin_lock(&nfs_client_lock); 371 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 372 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 373 374 /* Don't match clients that failed to initialise properly */ 375 if (!(clp->cl_cons_state == NFS_CS_READY || 376 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 377 continue; 378 379 /* Different NFS versions cannot share the same nfs_client */ 380 if (clp->rpc_ops->version != nfsversion) 381 continue; 382 383 /* Match only the IP address, not the port number */ 384 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 385 continue; 386 387 atomic_inc(&clp->cl_count); 388 spin_unlock(&nfs_client_lock); 389 return clp; 390 } 391 spin_unlock(&nfs_client_lock); 392 return NULL; 393} 394 395/* 396 * Find a client by IP address and protocol version 397 * - returns NULL if no such client 398 */ 399struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 400{ 401 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 402 u32 nfsvers = clp->rpc_ops->version; 403 404 spin_lock(&nfs_client_lock); 405 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 406 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 407 408 /* Don't match clients that failed to initialise properly */ 409 if (clp->cl_cons_state != NFS_CS_READY) 410 continue; 411 412 /* Different NFS versions cannot share the same nfs_client */ 413 if (clp->rpc_ops->version != nfsvers) 414 continue; 415 416 /* Match only the IP address, not the port number */ 417 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 418 continue; 419 420 atomic_inc(&clp->cl_count); 421 spin_unlock(&nfs_client_lock); 422 return clp; 423 } 424 spin_unlock(&nfs_client_lock); 425 return NULL; 426} 427 428/* 429 * Find an nfs_client on the list that matches the initialisation data 430 * that is supplied. 431 */ 432static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 433{ 434 struct nfs_client *clp; 435 const struct sockaddr *sap = data->addr; 436 437 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 438 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 439 /* Don't match clients that failed to initialise properly */ 440 if (clp->cl_cons_state < 0) 441 continue; 442 443 /* Different NFS versions cannot share the same nfs_client */ 444 if (clp->rpc_ops != data->rpc_ops) 445 continue; 446 447 if (clp->cl_proto != data->proto) 448 continue; 449 /* Match nfsv4 minorversion */ 450 if (clp->cl_minorversion != data->minorversion) 451 continue; 452 /* Match the full socket address */ 453 if (!nfs_sockaddr_cmp(sap, clap)) 454 continue; 455 456 atomic_inc(&clp->cl_count); 457 return clp; 458 } 459 return NULL; 460} 461 462/* 463 * Look up a client by IP address and protocol version 464 * - creates a new record if one doesn't yet exist 465 */ 466static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 467{ 468 struct nfs_client *clp, *new = NULL; 469 int error; 470 471 dprintk("--> nfs_get_client(%s,v%u)\n", 472 cl_init->hostname ?: "", cl_init->rpc_ops->version); 473 474 /* see if the client already exists */ 475 do { 476 spin_lock(&nfs_client_lock); 477 478 clp = nfs_match_client(cl_init); 479 if (clp) 480 goto found_client; 481 if (new) 482 goto install_client; 483 484 spin_unlock(&nfs_client_lock); 485 486 new = nfs_alloc_client(cl_init); 487 } while (!IS_ERR(new)); 488 489 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 490 return new; 491 492 /* install a new client and return with it unready */ 493install_client: 494 clp = new; 495 list_add(&clp->cl_share_link, &nfs_client_list); 496 spin_unlock(&nfs_client_lock); 497 dprintk("--> nfs_get_client() = %p [new]\n", clp); 498 return clp; 499 500 /* found an existing client 501 * - make sure it's ready before returning 502 */ 503found_client: 504 spin_unlock(&nfs_client_lock); 505 506 if (new) 507 nfs_free_client(new); 508 509 error = wait_event_killable(nfs_client_active_wq, 510 clp->cl_cons_state < NFS_CS_INITING); 511 if (error < 0) { 512 nfs_put_client(clp); 513 return ERR_PTR(-ERESTARTSYS); 514 } 515 516 if (clp->cl_cons_state < NFS_CS_READY) { 517 error = clp->cl_cons_state; 518 nfs_put_client(clp); 519 return ERR_PTR(error); 520 } 521 522 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 523 524 dprintk("--> nfs_get_client() = %p [share]\n", clp); 525 return clp; 526} 527 528/* 529 * Mark a server as ready or failed 530 */ 531void nfs_mark_client_ready(struct nfs_client *clp, int state) 532{ 533 clp->cl_cons_state = state; 534 wake_up_all(&nfs_client_active_wq); 535} 536 537/* 538 * With sessions, the client is not marked ready until after a 539 * successful EXCHANGE_ID and CREATE_SESSION. 540 * 541 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 542 * other versions of NFS can be tried. 543 */ 544int nfs4_check_client_ready(struct nfs_client *clp) 545{ 546 if (!nfs4_has_session(clp)) 547 return 0; 548 if (clp->cl_cons_state < NFS_CS_READY) 549 return -EPROTONOSUPPORT; 550 return 0; 551} 552 553/* 554 * Initialise the timeout values for a connection 555 */ 556static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 557 unsigned int timeo, unsigned int retrans) 558{ 559 to->to_initval = timeo * HZ / 10; 560 to->to_retries = retrans; 561 562 switch (proto) { 563 case XPRT_TRANSPORT_TCP: 564 case XPRT_TRANSPORT_RDMA: 565 if (to->to_retries == 0) 566 to->to_retries = NFS_DEF_TCP_RETRANS; 567 if (to->to_initval == 0) 568 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 569 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 570 to->to_initval = NFS_MAX_TCP_TIMEOUT; 571 to->to_increment = to->to_initval; 572 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 573 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 574 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 575 if (to->to_maxval < to->to_initval) 576 to->to_maxval = to->to_initval; 577 to->to_exponential = 0; 578 break; 579 case XPRT_TRANSPORT_UDP: 580 if (to->to_retries == 0) 581 to->to_retries = NFS_DEF_UDP_RETRANS; 582 if (!to->to_initval) 583 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 584 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 585 to->to_initval = NFS_MAX_UDP_TIMEOUT; 586 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 587 to->to_exponential = 1; 588 break; 589 default: 590 BUG(); 591 } 592} 593 594/* 595 * Create an RPC client handle 596 */ 597static int nfs_create_rpc_client(struct nfs_client *clp, 598 const struct rpc_timeout *timeparms, 599 rpc_authflavor_t flavor, 600 int discrtry, int noresvport) 601{ 602 struct rpc_clnt *clnt = NULL; 603 struct rpc_create_args args = { 604 .protocol = clp->cl_proto, 605 .address = (struct sockaddr *)&clp->cl_addr, 606 .addrsize = clp->cl_addrlen, 607 .timeout = timeparms, 608 .servername = clp->cl_hostname, 609 .program = &nfs_program, 610 .version = clp->rpc_ops->version, 611 .authflavor = flavor, 612 }; 613 614 if (discrtry) 615 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 616 if (noresvport) 617 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 618 619 if (!IS_ERR(clp->cl_rpcclient)) 620 return 0; 621 622 clnt = rpc_create(&args); 623 if (IS_ERR(clnt)) { 624 dprintk("%s: cannot create RPC client. Error = %ld\n", 625 __func__, PTR_ERR(clnt)); 626 return PTR_ERR(clnt); 627 } 628 629 clp->cl_rpcclient = clnt; 630 return 0; 631} 632 633/* 634 * Version 2 or 3 client destruction 635 */ 636static void nfs_destroy_server(struct nfs_server *server) 637{ 638 if (!(server->flags & NFS_MOUNT_NONLM)) 639 nlmclnt_done(server->nlm_host); 640} 641 642/* 643 * Version 2 or 3 lockd setup 644 */ 645static int nfs_start_lockd(struct nfs_server *server) 646{ 647 struct nlm_host *host; 648 struct nfs_client *clp = server->nfs_client; 649 struct nlmclnt_initdata nlm_init = { 650 .hostname = clp->cl_hostname, 651 .address = (struct sockaddr *)&clp->cl_addr, 652 .addrlen = clp->cl_addrlen, 653 .nfs_version = clp->rpc_ops->version, 654 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 655 1 : 0, 656 }; 657 658 if (nlm_init.nfs_version > 3) 659 return 0; 660 if (server->flags & NFS_MOUNT_NONLM) 661 return 0; 662 663 switch (clp->cl_proto) { 664 default: 665 nlm_init.protocol = IPPROTO_TCP; 666 break; 667 case XPRT_TRANSPORT_UDP: 668 nlm_init.protocol = IPPROTO_UDP; 669 } 670 671 host = nlmclnt_init(&nlm_init); 672 if (IS_ERR(host)) 673 return PTR_ERR(host); 674 675 server->nlm_host = host; 676 server->destroy = nfs_destroy_server; 677 return 0; 678} 679 680/* 681 * Initialise an NFSv3 ACL client connection 682 */ 683#ifdef CONFIG_NFS_V3_ACL 684static void nfs_init_server_aclclient(struct nfs_server *server) 685{ 686 if (server->nfs_client->rpc_ops->version != 3) 687 goto out_noacl; 688 if (server->flags & NFS_MOUNT_NOACL) 689 goto out_noacl; 690 691 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 692 if (IS_ERR(server->client_acl)) 693 goto out_noacl; 694 695 /* No errors! Assume that Sun nfsacls are supported */ 696 server->caps |= NFS_CAP_ACLS; 697 return; 698 699out_noacl: 700 server->caps &= ~NFS_CAP_ACLS; 701} 702#else 703static inline void nfs_init_server_aclclient(struct nfs_server *server) 704{ 705 server->flags &= ~NFS_MOUNT_NOACL; 706 server->caps &= ~NFS_CAP_ACLS; 707} 708#endif 709 710/* 711 * Create a general RPC client 712 */ 713static int nfs_init_server_rpcclient(struct nfs_server *server, 714 const struct rpc_timeout *timeo, 715 rpc_authflavor_t pseudoflavour) 716{ 717 struct nfs_client *clp = server->nfs_client; 718 719 server->client = rpc_clone_client(clp->cl_rpcclient); 720 if (IS_ERR(server->client)) { 721 dprintk("%s: couldn't create rpc_client!\n", __func__); 722 return PTR_ERR(server->client); 723 } 724 725 memcpy(&server->client->cl_timeout_default, 726 timeo, 727 sizeof(server->client->cl_timeout_default)); 728 server->client->cl_timeout = &server->client->cl_timeout_default; 729 730 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 731 struct rpc_auth *auth; 732 733 auth = rpcauth_create(pseudoflavour, server->client); 734 if (IS_ERR(auth)) { 735 dprintk("%s: couldn't create credcache!\n", __func__); 736 return PTR_ERR(auth); 737 } 738 } 739 server->client->cl_softrtry = 0; 740 if (server->flags & NFS_MOUNT_SOFT) 741 server->client->cl_softrtry = 1; 742 743 return 0; 744} 745 746/* 747 * Initialise an NFS2 or NFS3 client 748 */ 749static int nfs_init_client(struct nfs_client *clp, 750 const struct rpc_timeout *timeparms, 751 const struct nfs_parsed_mount_data *data) 752{ 753 int error; 754 755 if (clp->cl_cons_state == NFS_CS_READY) { 756 /* the client is already initialised */ 757 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 758 return 0; 759 } 760 761 /* 762 * Create a client RPC handle for doing FSSTAT with UNIX auth only 763 * - RFC 2623, sec 2.3.2 764 */ 765 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 766 0, data->flags & NFS_MOUNT_NORESVPORT); 767 if (error < 0) 768 goto error; 769 nfs_mark_client_ready(clp, NFS_CS_READY); 770 return 0; 771 772error: 773 nfs_mark_client_ready(clp, error); 774 dprintk("<-- nfs_init_client() = xerror %d\n", error); 775 return error; 776} 777 778/* 779 * Create a version 2 or 3 client 780 */ 781static int nfs_init_server(struct nfs_server *server, 782 const struct nfs_parsed_mount_data *data) 783{ 784 struct nfs_client_initdata cl_init = { 785 .hostname = data->nfs_server.hostname, 786 .addr = (const struct sockaddr *)&data->nfs_server.address, 787 .addrlen = data->nfs_server.addrlen, 788 .rpc_ops = &nfs_v2_clientops, 789 .proto = data->nfs_server.protocol, 790 }; 791 struct rpc_timeout timeparms; 792 struct nfs_client *clp; 793 int error; 794 795 dprintk("--> nfs_init_server()\n"); 796 797#ifdef CONFIG_NFS_V3 798 if (data->version == 3) 799 cl_init.rpc_ops = &nfs_v3_clientops; 800#endif 801 802 /* Allocate or find a client reference we can use */ 803 clp = nfs_get_client(&cl_init); 804 if (IS_ERR(clp)) { 805 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 806 return PTR_ERR(clp); 807 } 808 809 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 810 data->timeo, data->retrans); 811 error = nfs_init_client(clp, &timeparms, data); 812 if (error < 0) 813 goto error; 814 815 server->nfs_client = clp; 816 817 /* Initialise the client representation from the mount data */ 818 server->flags = data->flags; 819 server->options = data->options; 820 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 821 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 822 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 823 824 if (data->rsize) 825 server->rsize = nfs_block_size(data->rsize, NULL); 826 if (data->wsize) 827 server->wsize = nfs_block_size(data->wsize, NULL); 828 829 server->acregmin = data->acregmin * HZ; 830 server->acregmax = data->acregmax * HZ; 831 server->acdirmin = data->acdirmin * HZ; 832 server->acdirmax = data->acdirmax * HZ; 833 834 /* Start lockd here, before we might error out */ 835 error = nfs_start_lockd(server); 836 if (error < 0) 837 goto error; 838 839 server->port = data->nfs_server.port; 840 841 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 842 if (error < 0) 843 goto error; 844 845 /* Preserve the values of mount_server-related mount options */ 846 if (data->mount_server.addrlen) { 847 memcpy(&server->mountd_address, &data->mount_server.address, 848 data->mount_server.addrlen); 849 server->mountd_addrlen = data->mount_server.addrlen; 850 } 851 server->mountd_version = data->mount_server.version; 852 server->mountd_port = data->mount_server.port; 853 server->mountd_protocol = data->mount_server.protocol; 854 855 server->namelen = data->namlen; 856 /* Create a client RPC handle for the NFSv3 ACL management interface */ 857 nfs_init_server_aclclient(server); 858 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 859 return 0; 860 861error: 862 server->nfs_client = NULL; 863 nfs_put_client(clp); 864 dprintk("<-- nfs_init_server() = xerror %d\n", error); 865 return error; 866} 867 868/* 869 * Load up the server record from information gained in an fsinfo record 870 */ 871static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 872{ 873 unsigned long max_rpc_payload; 874 875 /* Work out a lot of parameters */ 876 if (server->rsize == 0) 877 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 878 if (server->wsize == 0) 879 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 880 881 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 882 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 883 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 884 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 885 886 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 887 if (server->rsize > max_rpc_payload) 888 server->rsize = max_rpc_payload; 889 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 890 server->rsize = NFS_MAX_FILE_IO_SIZE; 891 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 892 893 server->backing_dev_info.name = "nfs"; 894 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 895 896 if (server->wsize > max_rpc_payload) 897 server->wsize = max_rpc_payload; 898 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 899 server->wsize = NFS_MAX_FILE_IO_SIZE; 900 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 901 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 902 903 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 904 if (server->dtsize > PAGE_CACHE_SIZE) 905 server->dtsize = PAGE_CACHE_SIZE; 906 if (server->dtsize > server->rsize) 907 server->dtsize = server->rsize; 908 909 if (server->flags & NFS_MOUNT_NOAC) { 910 server->acregmin = server->acregmax = 0; 911 server->acdirmin = server->acdirmax = 0; 912 } 913 914 server->maxfilesize = fsinfo->maxfilesize; 915 916 /* We're airborne Set socket buffersize */ 917 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 918} 919 920/* 921 * Probe filesystem information, including the FSID on v2/v3 922 */ 923static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 924{ 925 struct nfs_fsinfo fsinfo; 926 struct nfs_client *clp = server->nfs_client; 927 int error; 928 929 dprintk("--> nfs_probe_fsinfo()\n"); 930 931 if (clp->rpc_ops->set_capabilities != NULL) { 932 error = clp->rpc_ops->set_capabilities(server, mntfh); 933 if (error < 0) 934 goto out_error; 935 } 936 937 fsinfo.fattr = fattr; 938 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 939 if (error < 0) 940 goto out_error; 941 942 nfs_server_set_fsinfo(server, &fsinfo); 943 944 /* Get some general file system info */ 945 if (server->namelen == 0) { 946 struct nfs_pathconf pathinfo; 947 948 pathinfo.fattr = fattr; 949 nfs_fattr_init(fattr); 950 951 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 952 server->namelen = pathinfo.max_namelen; 953 } 954 955 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 956 return 0; 957 958out_error: 959 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 960 return error; 961} 962 963/* 964 * Copy useful information when duplicating a server record 965 */ 966static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 967{ 968 target->flags = source->flags; 969 target->rsize = source->rsize; 970 target->wsize = source->wsize; 971 target->acregmin = source->acregmin; 972 target->acregmax = source->acregmax; 973 target->acdirmin = source->acdirmin; 974 target->acdirmax = source->acdirmax; 975 target->caps = source->caps; 976 target->options = source->options; 977} 978 979/* 980 * Allocate and initialise a server record 981 */ 982static struct nfs_server *nfs_alloc_server(void) 983{ 984 struct nfs_server *server; 985 986 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 987 if (!server) 988 return NULL; 989 990 server->client = server->client_acl = ERR_PTR(-EINVAL); 991 992 /* Zero out the NFS state stuff */ 993 INIT_LIST_HEAD(&server->client_link); 994 INIT_LIST_HEAD(&server->master_link); 995 996 atomic_set(&server->active, 0); 997 998 server->io_stats = nfs_alloc_iostats(); 999 if (!server->io_stats) { 1000 kfree(server); 1001 return NULL; 1002 } 1003 1004 if (bdi_init(&server->backing_dev_info)) { 1005 nfs_free_iostats(server->io_stats); 1006 kfree(server); 1007 return NULL; 1008 } 1009 1010 return server; 1011} 1012 1013/* 1014 * Free up a server record 1015 */ 1016void nfs_free_server(struct nfs_server *server) 1017{ 1018 dprintk("--> nfs_free_server()\n"); 1019 1020 spin_lock(&nfs_client_lock); 1021 list_del(&server->client_link); 1022 list_del(&server->master_link); 1023 spin_unlock(&nfs_client_lock); 1024 1025 if (server->destroy != NULL) 1026 server->destroy(server); 1027 1028 if (!IS_ERR(server->client_acl)) 1029 rpc_shutdown_client(server->client_acl); 1030 if (!IS_ERR(server->client)) 1031 rpc_shutdown_client(server->client); 1032 1033 nfs_put_client(server->nfs_client); 1034 1035 nfs_free_iostats(server->io_stats); 1036 bdi_destroy(&server->backing_dev_info); 1037 kfree(server); 1038 nfs_release_automount_timer(); 1039 dprintk("<-- nfs_free_server()\n"); 1040} 1041 1042/* 1043 * Create a version 2 or 3 volume record 1044 * - keyed on server and FSID 1045 */ 1046struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1047 struct nfs_fh *mntfh) 1048{ 1049 struct nfs_server *server; 1050 struct nfs_fattr *fattr; 1051 int error; 1052 1053 server = nfs_alloc_server(); 1054 if (!server) 1055 return ERR_PTR(-ENOMEM); 1056 1057 error = -ENOMEM; 1058 fattr = nfs_alloc_fattr(); 1059 if (fattr == NULL) 1060 goto error; 1061 1062 /* Get a client representation */ 1063 error = nfs_init_server(server, data); 1064 if (error < 0) 1065 goto error; 1066 1067 BUG_ON(!server->nfs_client); 1068 BUG_ON(!server->nfs_client->rpc_ops); 1069 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1070 1071 /* Probe the root fh to retrieve its FSID */ 1072 error = nfs_probe_fsinfo(server, mntfh, fattr); 1073 if (error < 0) 1074 goto error; 1075 if (server->nfs_client->rpc_ops->version == 3) { 1076 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1077 server->namelen = NFS3_MAXNAMLEN; 1078 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1079 server->caps |= NFS_CAP_READDIRPLUS; 1080 } else { 1081 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1082 server->namelen = NFS2_MAXNAMLEN; 1083 } 1084 1085 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1086 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1087 if (error < 0) { 1088 dprintk("nfs_create_server: getattr error = %d\n", -error); 1089 goto error; 1090 } 1091 } 1092 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1093 1094 dprintk("Server FSID: %llx:%llx\n", 1095 (unsigned long long) server->fsid.major, 1096 (unsigned long long) server->fsid.minor); 1097 1098 spin_lock(&nfs_client_lock); 1099 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1100 list_add_tail(&server->master_link, &nfs_volume_list); 1101 spin_unlock(&nfs_client_lock); 1102 1103 server->mount_time = jiffies; 1104 nfs_free_fattr(fattr); 1105 return server; 1106 1107error: 1108 nfs_free_fattr(fattr); 1109 nfs_free_server(server); 1110 return ERR_PTR(error); 1111} 1112 1113#ifdef CONFIG_NFS_V4 1114/* 1115 * Initialize the NFS4 callback service 1116 */ 1117static int nfs4_init_callback(struct nfs_client *clp) 1118{ 1119 int error; 1120 1121 if (clp->rpc_ops->version == 4) { 1122 if (nfs4_has_session(clp)) { 1123 error = xprt_setup_backchannel( 1124 clp->cl_rpcclient->cl_xprt, 1125 NFS41_BC_MIN_CALLBACKS); 1126 if (error < 0) 1127 return error; 1128 } 1129 1130 error = nfs_callback_up(clp->cl_mvops->minor_version, 1131 clp->cl_rpcclient->cl_xprt); 1132 if (error < 0) { 1133 dprintk("%s: failed to start callback. Error = %d\n", 1134 __func__, error); 1135 return error; 1136 } 1137 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1138 } 1139 return 0; 1140} 1141 1142/* 1143 * Initialize the minor version specific parts of an NFS4 client record 1144 */ 1145static int nfs4_init_client_minor_version(struct nfs_client *clp) 1146{ 1147#if defined(CONFIG_NFS_V4_1) 1148 if (clp->cl_mvops->minor_version) { 1149 struct nfs4_session *session = NULL; 1150 /* 1151 * Create the session and mark it expired. 1152 * When a SEQUENCE operation encounters the expired session 1153 * it will do session recovery to initialize it. 1154 */ 1155 session = nfs4_alloc_session(clp); 1156 if (!session) 1157 return -ENOMEM; 1158 1159 clp->cl_session = session; 1160 /* 1161 * The create session reply races with the server back 1162 * channel probe. Mark the client NFS_CS_SESSION_INITING 1163 * so that the client back channel can find the 1164 * nfs_client struct 1165 */ 1166 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1167 } 1168#endif /* CONFIG_NFS_V4_1 */ 1169 1170 return nfs4_init_callback(clp); 1171} 1172 1173/* 1174 * Initialise an NFS4 client record 1175 */ 1176static int nfs4_init_client(struct nfs_client *clp, 1177 const struct rpc_timeout *timeparms, 1178 const char *ip_addr, 1179 rpc_authflavor_t authflavour, 1180 int flags) 1181{ 1182 int error; 1183 1184 if (clp->cl_cons_state == NFS_CS_READY) { 1185 /* the client is initialised already */ 1186 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1187 return 0; 1188 } 1189 1190 /* Check NFS protocol revision and initialize RPC op vector */ 1191 clp->rpc_ops = &nfs_v4_clientops; 1192 1193 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1194 1, flags & NFS_MOUNT_NORESVPORT); 1195 if (error < 0) 1196 goto error; 1197 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1198 1199 error = nfs_idmap_new(clp); 1200 if (error < 0) { 1201 dprintk("%s: failed to create idmapper. Error = %d\n", 1202 __func__, error); 1203 goto error; 1204 } 1205 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1206 1207 error = nfs4_init_client_minor_version(clp); 1208 if (error < 0) 1209 goto error; 1210 1211 if (!nfs4_has_session(clp)) 1212 nfs_mark_client_ready(clp, NFS_CS_READY); 1213 return 0; 1214 1215error: 1216 nfs_mark_client_ready(clp, error); 1217 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1218 return error; 1219} 1220 1221/* 1222 * Set up an NFS4 client 1223 */ 1224static int nfs4_set_client(struct nfs_server *server, 1225 const char *hostname, 1226 const struct sockaddr *addr, 1227 const size_t addrlen, 1228 const char *ip_addr, 1229 rpc_authflavor_t authflavour, 1230 int proto, const struct rpc_timeout *timeparms, 1231 u32 minorversion) 1232{ 1233 struct nfs_client_initdata cl_init = { 1234 .hostname = hostname, 1235 .addr = addr, 1236 .addrlen = addrlen, 1237 .rpc_ops = &nfs_v4_clientops, 1238 .proto = proto, 1239 .minorversion = minorversion, 1240 }; 1241 struct nfs_client *clp; 1242 int error; 1243 1244 dprintk("--> nfs4_set_client()\n"); 1245 1246 /* Allocate or find a client reference we can use */ 1247 clp = nfs_get_client(&cl_init); 1248 if (IS_ERR(clp)) { 1249 error = PTR_ERR(clp); 1250 goto error; 1251 } 1252 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1253 server->flags); 1254 if (error < 0) 1255 goto error_put; 1256 1257 server->nfs_client = clp; 1258 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1259 return 0; 1260 1261error_put: 1262 nfs_put_client(clp); 1263error: 1264 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1265 return error; 1266} 1267 1268 1269/* 1270 * Session has been established, and the client marked ready. 1271 * Set the mount rsize and wsize with negotiated fore channel 1272 * attributes which will be bound checked in nfs_server_set_fsinfo. 1273 */ 1274static void nfs4_session_set_rwsize(struct nfs_server *server) 1275{ 1276#ifdef CONFIG_NFS_V4_1 1277 struct nfs4_session *sess; 1278 u32 server_resp_sz; 1279 u32 server_rqst_sz; 1280 1281 if (!nfs4_has_session(server->nfs_client)) 1282 return; 1283 sess = server->nfs_client->cl_session; 1284 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1285 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1286 1287 if (server->rsize > server_resp_sz) 1288 server->rsize = server_resp_sz; 1289 if (server->wsize > server_rqst_sz) 1290 server->wsize = server_rqst_sz; 1291#endif /* CONFIG_NFS_V4_1 */ 1292} 1293 1294static int nfs4_server_common_setup(struct nfs_server *server, 1295 struct nfs_fh *mntfh) 1296{ 1297 struct nfs_fattr *fattr; 1298 int error; 1299 1300 BUG_ON(!server->nfs_client); 1301 BUG_ON(!server->nfs_client->rpc_ops); 1302 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1303 1304 fattr = nfs_alloc_fattr(); 1305 if (fattr == NULL) 1306 return -ENOMEM; 1307 1308 /* We must ensure the session is initialised first */ 1309 error = nfs4_init_session(server); 1310 if (error < 0) 1311 goto out; 1312 1313 /* Probe the root fh to retrieve its FSID and filehandle */ 1314 error = nfs4_get_rootfh(server, mntfh); 1315 if (error < 0) 1316 goto out; 1317 1318 dprintk("Server FSID: %llx:%llx\n", 1319 (unsigned long long) server->fsid.major, 1320 (unsigned long long) server->fsid.minor); 1321 dprintk("Mount FH: %d\n", mntfh->size); 1322 1323 nfs4_session_set_rwsize(server); 1324 1325 error = nfs_probe_fsinfo(server, mntfh, fattr); 1326 if (error < 0) 1327 goto out; 1328 1329 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1330 server->namelen = NFS4_MAXNAMLEN; 1331 1332 spin_lock(&nfs_client_lock); 1333 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1334 list_add_tail(&server->master_link, &nfs_volume_list); 1335 spin_unlock(&nfs_client_lock); 1336 1337 server->mount_time = jiffies; 1338out: 1339 nfs_free_fattr(fattr); 1340 return error; 1341} 1342 1343/* 1344 * Create a version 4 volume record 1345 */ 1346static int nfs4_init_server(struct nfs_server *server, 1347 const struct nfs_parsed_mount_data *data) 1348{ 1349 struct rpc_timeout timeparms; 1350 int error; 1351 1352 dprintk("--> nfs4_init_server()\n"); 1353 1354 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1355 data->timeo, data->retrans); 1356 1357 /* Initialise the client representation from the mount data */ 1358 server->flags = data->flags; 1359 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR| 1360 NFS_CAP_POSIX_LOCK; 1361 server->options = data->options; 1362 1363 /* Get a client record */ 1364 error = nfs4_set_client(server, 1365 data->nfs_server.hostname, 1366 (const struct sockaddr *)&data->nfs_server.address, 1367 data->nfs_server.addrlen, 1368 data->client_address, 1369 data->auth_flavors[0], 1370 data->nfs_server.protocol, 1371 &timeparms, 1372 data->minorversion); 1373 if (error < 0) 1374 goto error; 1375 1376 if (data->rsize) 1377 server->rsize = nfs_block_size(data->rsize, NULL); 1378 if (data->wsize) 1379 server->wsize = nfs_block_size(data->wsize, NULL); 1380 1381 server->acregmin = data->acregmin * HZ; 1382 server->acregmax = data->acregmax * HZ; 1383 server->acdirmin = data->acdirmin * HZ; 1384 server->acdirmax = data->acdirmax * HZ; 1385 1386 server->port = data->nfs_server.port; 1387 1388 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1389 1390error: 1391 /* Done */ 1392 dprintk("<-- nfs4_init_server() = %d\n", error); 1393 return error; 1394} 1395 1396/* 1397 * Create a version 4 volume record 1398 * - keyed on server and FSID 1399 */ 1400struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1401 struct nfs_fh *mntfh) 1402{ 1403 struct nfs_server *server; 1404 int error; 1405 1406 dprintk("--> nfs4_create_server()\n"); 1407 1408 server = nfs_alloc_server(); 1409 if (!server) 1410 return ERR_PTR(-ENOMEM); 1411 1412 /* set up the general RPC client */ 1413 error = nfs4_init_server(server, data); 1414 if (error < 0) 1415 goto error; 1416 1417 error = nfs4_server_common_setup(server, mntfh); 1418 if (error < 0) 1419 goto error; 1420 1421 dprintk("<-- nfs4_create_server() = %p\n", server); 1422 return server; 1423 1424error: 1425 nfs_free_server(server); 1426 dprintk("<-- nfs4_create_server() = error %d\n", error); 1427 return ERR_PTR(error); 1428} 1429 1430/* 1431 * Create an NFS4 referral server record 1432 */ 1433struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1434 struct nfs_fh *mntfh) 1435{ 1436 struct nfs_client *parent_client; 1437 struct nfs_server *server, *parent_server; 1438 int error; 1439 1440 dprintk("--> nfs4_create_referral_server()\n"); 1441 1442 server = nfs_alloc_server(); 1443 if (!server) 1444 return ERR_PTR(-ENOMEM); 1445 1446 parent_server = NFS_SB(data->sb); 1447 parent_client = parent_server->nfs_client; 1448 1449 /* Initialise the client representation from the parent server */ 1450 nfs_server_copy_userdata(server, parent_server); 1451 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1452 1453 /* Get a client representation. 1454 * Note: NFSv4 always uses TCP, */ 1455 error = nfs4_set_client(server, data->hostname, 1456 data->addr, 1457 data->addrlen, 1458 parent_client->cl_ipaddr, 1459 data->authflavor, 1460 parent_server->client->cl_xprt->prot, 1461 parent_server->client->cl_timeout, 1462 parent_client->cl_mvops->minor_version); 1463 if (error < 0) 1464 goto error; 1465 1466 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1467 if (error < 0) 1468 goto error; 1469 1470 error = nfs4_server_common_setup(server, mntfh); 1471 if (error < 0) 1472 goto error; 1473 1474 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1475 return server; 1476 1477error: 1478 nfs_free_server(server); 1479 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1480 return ERR_PTR(error); 1481} 1482 1483#endif /* CONFIG_NFS_V4 */ 1484 1485/* 1486 * Clone an NFS2, NFS3 or NFS4 server record 1487 */ 1488struct nfs_server *nfs_clone_server(struct nfs_server *source, 1489 struct nfs_fh *fh, 1490 struct nfs_fattr *fattr) 1491{ 1492 struct nfs_server *server; 1493 struct nfs_fattr *fattr_fsinfo; 1494 int error; 1495 1496 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1497 (unsigned long long) fattr->fsid.major, 1498 (unsigned long long) fattr->fsid.minor); 1499 1500 server = nfs_alloc_server(); 1501 if (!server) 1502 return ERR_PTR(-ENOMEM); 1503 1504 error = -ENOMEM; 1505 fattr_fsinfo = nfs_alloc_fattr(); 1506 if (fattr_fsinfo == NULL) 1507 goto out_free_server; 1508 1509 /* Copy data from the source */ 1510 server->nfs_client = source->nfs_client; 1511 atomic_inc(&server->nfs_client->cl_count); 1512 nfs_server_copy_userdata(server, source); 1513 1514 server->fsid = fattr->fsid; 1515 1516 error = nfs_init_server_rpcclient(server, 1517 source->client->cl_timeout, 1518 source->client->cl_auth->au_flavor); 1519 if (error < 0) 1520 goto out_free_server; 1521 if (!IS_ERR(source->client_acl)) 1522 nfs_init_server_aclclient(server); 1523 1524 /* probe the filesystem info for this server filesystem */ 1525 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1526 if (error < 0) 1527 goto out_free_server; 1528 1529 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1530 server->namelen = NFS4_MAXNAMLEN; 1531 1532 dprintk("Cloned FSID: %llx:%llx\n", 1533 (unsigned long long) server->fsid.major, 1534 (unsigned long long) server->fsid.minor); 1535 1536 error = nfs_start_lockd(server); 1537 if (error < 0) 1538 goto out_free_server; 1539 1540 spin_lock(&nfs_client_lock); 1541 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1542 list_add_tail(&server->master_link, &nfs_volume_list); 1543 spin_unlock(&nfs_client_lock); 1544 1545 server->mount_time = jiffies; 1546 1547 nfs_free_fattr(fattr_fsinfo); 1548 dprintk("<-- nfs_clone_server() = %p\n", server); 1549 return server; 1550 1551out_free_server: 1552 nfs_free_fattr(fattr_fsinfo); 1553 nfs_free_server(server); 1554 dprintk("<-- nfs_clone_server() = error %d\n", error); 1555 return ERR_PTR(error); 1556} 1557 1558#ifdef CONFIG_PROC_FS 1559static struct proc_dir_entry *proc_fs_nfs; 1560 1561static int nfs_server_list_open(struct inode *inode, struct file *file); 1562static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1563static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1564static void nfs_server_list_stop(struct seq_file *p, void *v); 1565static int nfs_server_list_show(struct seq_file *m, void *v); 1566 1567static const struct seq_operations nfs_server_list_ops = { 1568 .start = nfs_server_list_start, 1569 .next = nfs_server_list_next, 1570 .stop = nfs_server_list_stop, 1571 .show = nfs_server_list_show, 1572}; 1573 1574static const struct file_operations nfs_server_list_fops = { 1575 .open = nfs_server_list_open, 1576 .read = seq_read, 1577 .llseek = seq_lseek, 1578 .release = seq_release, 1579 .owner = THIS_MODULE, 1580}; 1581 1582static int nfs_volume_list_open(struct inode *inode, struct file *file); 1583static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1584static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1585static void nfs_volume_list_stop(struct seq_file *p, void *v); 1586static int nfs_volume_list_show(struct seq_file *m, void *v); 1587 1588static const struct seq_operations nfs_volume_list_ops = { 1589 .start = nfs_volume_list_start, 1590 .next = nfs_volume_list_next, 1591 .stop = nfs_volume_list_stop, 1592 .show = nfs_volume_list_show, 1593}; 1594 1595static const struct file_operations nfs_volume_list_fops = { 1596 .open = nfs_volume_list_open, 1597 .read = seq_read, 1598 .llseek = seq_lseek, 1599 .release = seq_release, 1600 .owner = THIS_MODULE, 1601}; 1602 1603/* 1604 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1605 * we're dealing 1606 */ 1607static int nfs_server_list_open(struct inode *inode, struct file *file) 1608{ 1609 struct seq_file *m; 1610 int ret; 1611 1612 ret = seq_open(file, &nfs_server_list_ops); 1613 if (ret < 0) 1614 return ret; 1615 1616 m = file->private_data; 1617 m->private = PDE(inode)->data; 1618 1619 return 0; 1620} 1621 1622/* 1623 * set up the iterator to start reading from the server list and return the first item 1624 */ 1625static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1626{ 1627 /* lock the list against modification */ 1628 spin_lock(&nfs_client_lock); 1629 return seq_list_start_head(&nfs_client_list, *_pos); 1630} 1631 1632/* 1633 * move to next server 1634 */ 1635static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1636{ 1637 return seq_list_next(v, &nfs_client_list, pos); 1638} 1639 1640/* 1641 * clean up after reading from the transports list 1642 */ 1643static void nfs_server_list_stop(struct seq_file *p, void *v) 1644{ 1645 spin_unlock(&nfs_client_lock); 1646} 1647 1648/* 1649 * display a header line followed by a load of call lines 1650 */ 1651static int nfs_server_list_show(struct seq_file *m, void *v) 1652{ 1653 struct nfs_client *clp; 1654 1655 /* display header on line 1 */ 1656 if (v == &nfs_client_list) { 1657 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1658 return 0; 1659 } 1660 1661 /* display one transport per line on subsequent lines */ 1662 clp = list_entry(v, struct nfs_client, cl_share_link); 1663 1664 seq_printf(m, "v%u %s %s %3d %s\n", 1665 clp->rpc_ops->version, 1666 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1667 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1668 atomic_read(&clp->cl_count), 1669 clp->cl_hostname); 1670 1671 return 0; 1672} 1673 1674/* 1675 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1676 */ 1677static int nfs_volume_list_open(struct inode *inode, struct file *file) 1678{ 1679 struct seq_file *m; 1680 int ret; 1681 1682 ret = seq_open(file, &nfs_volume_list_ops); 1683 if (ret < 0) 1684 return ret; 1685 1686 m = file->private_data; 1687 m->private = PDE(inode)->data; 1688 1689 return 0; 1690} 1691 1692/* 1693 * set up the iterator to start reading from the volume list and return the first item 1694 */ 1695static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1696{ 1697 /* lock the list against modification */ 1698 spin_lock(&nfs_client_lock); 1699 return seq_list_start_head(&nfs_volume_list, *_pos); 1700} 1701 1702/* 1703 * move to next volume 1704 */ 1705static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1706{ 1707 return seq_list_next(v, &nfs_volume_list, pos); 1708} 1709 1710/* 1711 * clean up after reading from the transports list 1712 */ 1713static void nfs_volume_list_stop(struct seq_file *p, void *v) 1714{ 1715 spin_unlock(&nfs_client_lock); 1716} 1717 1718/* 1719 * display a header line followed by a load of call lines 1720 */ 1721static int nfs_volume_list_show(struct seq_file *m, void *v) 1722{ 1723 struct nfs_server *server; 1724 struct nfs_client *clp; 1725 char dev[8], fsid[17]; 1726 1727 /* display header on line 1 */ 1728 if (v == &nfs_volume_list) { 1729 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1730 return 0; 1731 } 1732 /* display one transport per line on subsequent lines */ 1733 server = list_entry(v, struct nfs_server, master_link); 1734 clp = server->nfs_client; 1735 1736 snprintf(dev, 8, "%u:%u", 1737 MAJOR(server->s_dev), MINOR(server->s_dev)); 1738 1739 snprintf(fsid, 17, "%llx:%llx", 1740 (unsigned long long) server->fsid.major, 1741 (unsigned long long) server->fsid.minor); 1742 1743 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1744 clp->rpc_ops->version, 1745 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1746 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1747 dev, 1748 fsid, 1749 nfs_server_fscache_state(server)); 1750 1751 return 0; 1752} 1753 1754/* 1755 * initialise the /proc/fs/nfsfs/ directory 1756 */ 1757int __init nfs_fs_proc_init(void) 1758{ 1759 struct proc_dir_entry *p; 1760 1761 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1762 if (!proc_fs_nfs) 1763 goto error_0; 1764 1765 /* a file of servers with which we're dealing */ 1766 p = proc_create("servers", S_IFREG|S_IRUGO, 1767 proc_fs_nfs, &nfs_server_list_fops); 1768 if (!p) 1769 goto error_1; 1770 1771 /* a file of volumes that we have mounted */ 1772 p = proc_create("volumes", S_IFREG|S_IRUGO, 1773 proc_fs_nfs, &nfs_volume_list_fops); 1774 if (!p) 1775 goto error_2; 1776 return 0; 1777 1778error_2: 1779 remove_proc_entry("servers", proc_fs_nfs); 1780error_1: 1781 remove_proc_entry("fs/nfsfs", NULL); 1782error_0: 1783 return -ENOMEM; 1784} 1785 1786/* 1787 * clean up the /proc/fs/nfsfs/ directory 1788 */ 1789void nfs_fs_proc_exit(void) 1790{ 1791 remove_proc_entry("volumes", proc_fs_nfs); 1792 remove_proc_entry("servers", proc_fs_nfs); 1793 remove_proc_entry("fs/nfsfs", NULL); 1794} 1795 1796#endif /* CONFIG_PROC_FS */ 1797