1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <net/ipv6.h> 39 #include <linux/nfs_xdr.h> 40 #include <linux/sunrpc/bc_xprt.h> 41 42 #include <asm/system.h> 43 44 #include "nfs4_fs.h" 45 #include "callback.h" 46 #include "delegation.h" 47 #include "iostat.h" 48 #include "internal.h" 49 #include "fscache.h" 50 51 #define NFSDBG_FACILITY NFSDBG_CLIENT 52 53 static DEFINE_SPINLOCK(nfs_client_lock); 54 static LIST_HEAD(nfs_client_list); 55 static LIST_HEAD(nfs_volume_list); 56 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 57 58 /* 59 * RPC cruft for NFS 60 */ 61 static struct rpc_version *nfs_version[5] = { 62 [2] = &nfs_version2, 63 #ifdef CONFIG_NFS_V3 64 [3] = &nfs_version3, 65 #endif 66 #ifdef CONFIG_NFS_V4 67 [4] = &nfs_version4, 68 #endif 69 }; 70 71 struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .stats = &nfs_rpcstat, 77 .pipe_dir_name = "/nfs", 78 }; 79 80 struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82 }; 83 84 85 #ifdef CONFIG_NFS_V3_ACL 86 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 87 static struct rpc_version * nfsacl_version[] = { 88 [3] = &nfsacl_version3, 89 }; 90 91 struct rpc_program nfsacl_program = { 92 .name = "nfsacl", 93 .number = NFS_ACL_PROGRAM, 94 .nrvers = ARRAY_SIZE(nfsacl_version), 95 .version = nfsacl_version, 96 .stats = &nfsacl_rpcstat, 97 }; 98 #endif /* CONFIG_NFS_V3_ACL */ 99 100 struct nfs_client_initdata { 101 const char *hostname; 102 const struct sockaddr *addr; 103 size_t addrlen; 104 const struct nfs_rpc_ops *rpc_ops; 105 int proto; 106 u32 minorversion; 107 }; 108 109 /* 110 * Allocate a shared client record 111 * 112 * Since these are allocated/deallocated very rarely, we don't 113 * bother putting them in a slab cache... 114 */ 115 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 116 { 117 struct nfs_client *clp; 118 struct rpc_cred *cred; 119 int err = -ENOMEM; 120 121 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 122 goto error_0; 123 124 clp->rpc_ops = cl_init->rpc_ops; 125 126 atomic_set(&clp->cl_count, 1); 127 clp->cl_cons_state = NFS_CS_INITING; 128 129 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 130 clp->cl_addrlen = cl_init->addrlen; 131 132 if (cl_init->hostname) { 133 err = -ENOMEM; 134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 135 if (!clp->cl_hostname) 136 goto error_cleanup; 137 } 138 139 INIT_LIST_HEAD(&clp->cl_superblocks); 140 clp->cl_rpcclient = ERR_PTR(-EINVAL); 141 142 clp->cl_proto = cl_init->proto; 143 144 #ifdef CONFIG_NFS_V4 145 INIT_LIST_HEAD(&clp->cl_delegations); 146 spin_lock_init(&clp->cl_lock); 147 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 149 clp->cl_boot_time = CURRENT_TIME; 150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 151 clp->cl_minorversion = cl_init->minorversion; 152 #endif 153 cred = rpc_lookup_machine_cred(); 154 if (!IS_ERR(cred)) 155 clp->cl_machine_cred = cred; 156 157 nfs_fscache_get_client_cookie(clp); 158 159 return clp; 160 161 error_cleanup: 162 kfree(clp); 163 error_0: 164 return ERR_PTR(err); 165 } 166 167 static void nfs4_shutdown_client(struct nfs_client *clp) 168 { 169 #ifdef CONFIG_NFS_V4 170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 171 nfs4_kill_renewd(clp); 172 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners)); 173 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 174 nfs_idmap_delete(clp); 175 176 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 177 #endif 178 } 179 180 /* 181 * Destroy the NFS4 callback service 182 */ 183 static void nfs4_destroy_callback(struct nfs_client *clp) 184 { 185 #ifdef CONFIG_NFS_V4 186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 187 nfs_callback_down(clp->cl_minorversion); 188 #endif /* CONFIG_NFS_V4 */ 189 } 190 191 /* 192 * Clears/puts all minor version specific parts from an nfs_client struct 193 * reverting it to minorversion 0. 194 */ 195 static void nfs4_clear_client_minor_version(struct nfs_client *clp) 196 { 197 #ifdef CONFIG_NFS_V4_1 198 if (nfs4_has_session(clp)) { 199 nfs4_destroy_session(clp->cl_session); 200 clp->cl_session = NULL; 201 } 202 203 clp->cl_call_sync = _nfs4_call_sync; 204 #endif /* CONFIG_NFS_V4_1 */ 205 206 nfs4_destroy_callback(clp); 207 } 208 209 /* 210 * Destroy a shared client record 211 */ 212 static void nfs_free_client(struct nfs_client *clp) 213 { 214 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 215 216 nfs4_clear_client_minor_version(clp); 217 nfs4_shutdown_client(clp); 218 219 nfs_fscache_release_client_cookie(clp); 220 221 /* -EIO all pending I/O */ 222 if (!IS_ERR(clp->cl_rpcclient)) 223 rpc_shutdown_client(clp->cl_rpcclient); 224 225 if (clp->cl_machine_cred != NULL) 226 put_rpccred(clp->cl_machine_cred); 227 228 kfree(clp->cl_hostname); 229 kfree(clp); 230 231 dprintk("<-- nfs_free_client()\n"); 232 } 233 234 /* 235 * Release a reference to a shared client record 236 */ 237 void nfs_put_client(struct nfs_client *clp) 238 { 239 if (!clp) 240 return; 241 242 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 243 244 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 245 list_del(&clp->cl_share_link); 246 spin_unlock(&nfs_client_lock); 247 248 BUG_ON(!list_empty(&clp->cl_superblocks)); 249 250 nfs_free_client(clp); 251 } 252 } 253 254 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 255 /* 256 * Test if two ip6 socket addresses refer to the same socket by 257 * comparing relevant fields. The padding bytes specifically, are not 258 * compared. sin6_flowinfo is not compared because it only affects QoS 259 * and sin6_scope_id is only compared if the address is "link local" 260 * because "link local" addresses need only be unique to a specific 261 * link. Conversely, ordinary unicast addresses might have different 262 * sin6_scope_id. 263 * 264 * The caller should ensure both socket addresses are AF_INET6. 265 */ 266 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 267 const struct sockaddr *sa2) 268 { 269 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 270 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 271 272 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 273 sin1->sin6_scope_id != sin2->sin6_scope_id) 274 return 0; 275 276 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); 277 } 278 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 279 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 280 const struct sockaddr *sa2) 281 { 282 return 0; 283 } 284 #endif 285 286 /* 287 * Test if two ip4 socket addresses refer to the same socket, by 288 * comparing relevant fields. The padding bytes specifically, are 289 * not compared. 290 * 291 * The caller should ensure both socket addresses are AF_INET. 292 */ 293 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 294 const struct sockaddr *sa2) 295 { 296 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 297 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 298 299 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 300 } 301 302 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 303 const struct sockaddr *sa2) 304 { 305 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 306 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 307 308 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 309 (sin1->sin6_port == sin2->sin6_port); 310 } 311 312 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 313 const struct sockaddr *sa2) 314 { 315 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 316 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 317 318 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 319 (sin1->sin_port == sin2->sin_port); 320 } 321 322 /* 323 * Test if two socket addresses represent the same actual socket, 324 * by comparing (only) relevant fields, excluding the port number. 325 */ 326 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 327 const struct sockaddr *sa2) 328 { 329 if (sa1->sa_family != sa2->sa_family) 330 return 0; 331 332 switch (sa1->sa_family) { 333 case AF_INET: 334 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 335 case AF_INET6: 336 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 337 } 338 return 0; 339 } 340 341 /* 342 * Test if two socket addresses represent the same actual socket, 343 * by comparing (only) relevant fields, including the port number. 344 */ 345 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 346 const struct sockaddr *sa2) 347 { 348 if (sa1->sa_family != sa2->sa_family) 349 return 0; 350 351 switch (sa1->sa_family) { 352 case AF_INET: 353 return nfs_sockaddr_cmp_ip4(sa1, sa2); 354 case AF_INET6: 355 return nfs_sockaddr_cmp_ip6(sa1, sa2); 356 } 357 return 0; 358 } 359 360 /* 361 * Find a client by IP address and protocol version 362 * - returns NULL if no such client 363 */ 364 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 365 { 366 struct nfs_client *clp; 367 368 spin_lock(&nfs_client_lock); 369 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 370 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 371 372 /* Don't match clients that failed to initialise properly */ 373 if (!(clp->cl_cons_state == NFS_CS_READY || 374 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 375 continue; 376 377 /* Different NFS versions cannot share the same nfs_client */ 378 if (clp->rpc_ops->version != nfsversion) 379 continue; 380 381 /* Match only the IP address, not the port number */ 382 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 383 continue; 384 385 atomic_inc(&clp->cl_count); 386 spin_unlock(&nfs_client_lock); 387 return clp; 388 } 389 spin_unlock(&nfs_client_lock); 390 return NULL; 391 } 392 393 /* 394 * Find a client by IP address and protocol version 395 * - returns NULL if no such client 396 */ 397 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 398 { 399 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 400 u32 nfsvers = clp->rpc_ops->version; 401 402 spin_lock(&nfs_client_lock); 403 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 404 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 405 406 /* Don't match clients that failed to initialise properly */ 407 if (clp->cl_cons_state != NFS_CS_READY) 408 continue; 409 410 /* Different NFS versions cannot share the same nfs_client */ 411 if (clp->rpc_ops->version != nfsvers) 412 continue; 413 414 /* Match only the IP address, not the port number */ 415 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 416 continue; 417 418 atomic_inc(&clp->cl_count); 419 spin_unlock(&nfs_client_lock); 420 return clp; 421 } 422 spin_unlock(&nfs_client_lock); 423 return NULL; 424 } 425 426 /* 427 * Find an nfs_client on the list that matches the initialisation data 428 * that is supplied. 429 */ 430 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 431 { 432 struct nfs_client *clp; 433 const struct sockaddr *sap = data->addr; 434 435 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 436 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 437 /* Don't match clients that failed to initialise properly */ 438 if (clp->cl_cons_state < 0) 439 continue; 440 441 /* Different NFS versions cannot share the same nfs_client */ 442 if (clp->rpc_ops != data->rpc_ops) 443 continue; 444 445 if (clp->cl_proto != data->proto) 446 continue; 447 /* Match nfsv4 minorversion */ 448 if (clp->cl_minorversion != data->minorversion) 449 continue; 450 /* Match the full socket address */ 451 if (!nfs_sockaddr_cmp(sap, clap)) 452 continue; 453 454 atomic_inc(&clp->cl_count); 455 return clp; 456 } 457 return NULL; 458 } 459 460 /* 461 * Look up a client by IP address and protocol version 462 * - creates a new record if one doesn't yet exist 463 */ 464 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 465 { 466 struct nfs_client *clp, *new = NULL; 467 int error; 468 469 dprintk("--> nfs_get_client(%s,v%u)\n", 470 cl_init->hostname ?: "", cl_init->rpc_ops->version); 471 472 /* see if the client already exists */ 473 do { 474 spin_lock(&nfs_client_lock); 475 476 clp = nfs_match_client(cl_init); 477 if (clp) 478 goto found_client; 479 if (new) 480 goto install_client; 481 482 spin_unlock(&nfs_client_lock); 483 484 new = nfs_alloc_client(cl_init); 485 } while (!IS_ERR(new)); 486 487 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 488 return new; 489 490 /* install a new client and return with it unready */ 491 install_client: 492 clp = new; 493 list_add(&clp->cl_share_link, &nfs_client_list); 494 spin_unlock(&nfs_client_lock); 495 dprintk("--> nfs_get_client() = %p [new]\n", clp); 496 return clp; 497 498 /* found an existing client 499 * - make sure it's ready before returning 500 */ 501 found_client: 502 spin_unlock(&nfs_client_lock); 503 504 if (new) 505 nfs_free_client(new); 506 507 error = wait_event_killable(nfs_client_active_wq, 508 clp->cl_cons_state < NFS_CS_INITING); 509 if (error < 0) { 510 nfs_put_client(clp); 511 return ERR_PTR(-ERESTARTSYS); 512 } 513 514 if (clp->cl_cons_state < NFS_CS_READY) { 515 error = clp->cl_cons_state; 516 nfs_put_client(clp); 517 return ERR_PTR(error); 518 } 519 520 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 521 522 dprintk("--> nfs_get_client() = %p [share]\n", clp); 523 return clp; 524 } 525 526 /* 527 * Mark a server as ready or failed 528 */ 529 void nfs_mark_client_ready(struct nfs_client *clp, int state) 530 { 531 clp->cl_cons_state = state; 532 wake_up_all(&nfs_client_active_wq); 533 } 534 535 /* 536 * With sessions, the client is not marked ready until after a 537 * successful EXCHANGE_ID and CREATE_SESSION. 538 * 539 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 540 * other versions of NFS can be tried. 541 */ 542 int nfs4_check_client_ready(struct nfs_client *clp) 543 { 544 if (!nfs4_has_session(clp)) 545 return 0; 546 if (clp->cl_cons_state < NFS_CS_READY) 547 return -EPROTONOSUPPORT; 548 return 0; 549 } 550 551 /* 552 * Initialise the timeout values for a connection 553 */ 554 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 555 unsigned int timeo, unsigned int retrans) 556 { 557 to->to_initval = timeo * HZ / 10; 558 to->to_retries = retrans; 559 560 switch (proto) { 561 case XPRT_TRANSPORT_TCP: 562 case XPRT_TRANSPORT_RDMA: 563 if (to->to_retries == 0) 564 to->to_retries = NFS_DEF_TCP_RETRANS; 565 if (to->to_initval == 0) 566 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 567 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 568 to->to_initval = NFS_MAX_TCP_TIMEOUT; 569 to->to_increment = to->to_initval; 570 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 571 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 572 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 573 if (to->to_maxval < to->to_initval) 574 to->to_maxval = to->to_initval; 575 to->to_exponential = 0; 576 break; 577 case XPRT_TRANSPORT_UDP: 578 if (to->to_retries == 0) 579 to->to_retries = NFS_DEF_UDP_RETRANS; 580 if (!to->to_initval) 581 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 582 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 583 to->to_initval = NFS_MAX_UDP_TIMEOUT; 584 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 585 to->to_exponential = 1; 586 break; 587 default: 588 BUG(); 589 } 590 } 591 592 /* 593 * Create an RPC client handle 594 */ 595 static int nfs_create_rpc_client(struct nfs_client *clp, 596 const struct rpc_timeout *timeparms, 597 rpc_authflavor_t flavor, 598 int discrtry, int noresvport) 599 { 600 struct rpc_clnt *clnt = NULL; 601 struct rpc_create_args args = { 602 .protocol = clp->cl_proto, 603 .address = (struct sockaddr *)&clp->cl_addr, 604 .addrsize = clp->cl_addrlen, 605 .timeout = timeparms, 606 .servername = clp->cl_hostname, 607 .program = &nfs_program, 608 .version = clp->rpc_ops->version, 609 .authflavor = flavor, 610 }; 611 612 if (discrtry) 613 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 614 if (noresvport) 615 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 616 617 if (!IS_ERR(clp->cl_rpcclient)) 618 return 0; 619 620 clnt = rpc_create(&args); 621 if (IS_ERR(clnt)) { 622 dprintk("%s: cannot create RPC client. Error = %ld\n", 623 __func__, PTR_ERR(clnt)); 624 return PTR_ERR(clnt); 625 } 626 627 clp->cl_rpcclient = clnt; 628 return 0; 629 } 630 631 /* 632 * Version 2 or 3 client destruction 633 */ 634 static void nfs_destroy_server(struct nfs_server *server) 635 { 636 if (!(server->flags & NFS_MOUNT_NONLM)) 637 nlmclnt_done(server->nlm_host); 638 } 639 640 /* 641 * Version 2 or 3 lockd setup 642 */ 643 static int nfs_start_lockd(struct nfs_server *server) 644 { 645 struct nlm_host *host; 646 struct nfs_client *clp = server->nfs_client; 647 struct nlmclnt_initdata nlm_init = { 648 .hostname = clp->cl_hostname, 649 .address = (struct sockaddr *)&clp->cl_addr, 650 .addrlen = clp->cl_addrlen, 651 .protocol = server->flags & NFS_MOUNT_TCP ? 652 IPPROTO_TCP : IPPROTO_UDP, 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 host = nlmclnt_init(&nlm_init); 664 if (IS_ERR(host)) 665 return PTR_ERR(host); 666 667 server->nlm_host = host; 668 server->destroy = nfs_destroy_server; 669 return 0; 670 } 671 672 /* 673 * Initialise an NFSv3 ACL client connection 674 */ 675 #ifdef CONFIG_NFS_V3_ACL 676 static void nfs_init_server_aclclient(struct nfs_server *server) 677 { 678 if (server->nfs_client->rpc_ops->version != 3) 679 goto out_noacl; 680 if (server->flags & NFS_MOUNT_NOACL) 681 goto out_noacl; 682 683 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 684 if (IS_ERR(server->client_acl)) 685 goto out_noacl; 686 687 /* No errors! Assume that Sun nfsacls are supported */ 688 server->caps |= NFS_CAP_ACLS; 689 return; 690 691 out_noacl: 692 server->caps &= ~NFS_CAP_ACLS; 693 } 694 #else 695 static inline void nfs_init_server_aclclient(struct nfs_server *server) 696 { 697 server->flags &= ~NFS_MOUNT_NOACL; 698 server->caps &= ~NFS_CAP_ACLS; 699 } 700 #endif 701 702 /* 703 * Create a general RPC client 704 */ 705 static int nfs_init_server_rpcclient(struct nfs_server *server, 706 const struct rpc_timeout *timeo, 707 rpc_authflavor_t pseudoflavour) 708 { 709 struct nfs_client *clp = server->nfs_client; 710 711 server->client = rpc_clone_client(clp->cl_rpcclient); 712 if (IS_ERR(server->client)) { 713 dprintk("%s: couldn't create rpc_client!\n", __func__); 714 return PTR_ERR(server->client); 715 } 716 717 memcpy(&server->client->cl_timeout_default, 718 timeo, 719 sizeof(server->client->cl_timeout_default)); 720 server->client->cl_timeout = &server->client->cl_timeout_default; 721 722 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 723 struct rpc_auth *auth; 724 725 auth = rpcauth_create(pseudoflavour, server->client); 726 if (IS_ERR(auth)) { 727 dprintk("%s: couldn't create credcache!\n", __func__); 728 return PTR_ERR(auth); 729 } 730 } 731 server->client->cl_softrtry = 0; 732 if (server->flags & NFS_MOUNT_SOFT) 733 server->client->cl_softrtry = 1; 734 735 return 0; 736 } 737 738 /* 739 * Initialise an NFS2 or NFS3 client 740 */ 741 static int nfs_init_client(struct nfs_client *clp, 742 const struct rpc_timeout *timeparms, 743 const struct nfs_parsed_mount_data *data) 744 { 745 int error; 746 747 if (clp->cl_cons_state == NFS_CS_READY) { 748 /* the client is already initialised */ 749 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 750 return 0; 751 } 752 753 /* 754 * Create a client RPC handle for doing FSSTAT with UNIX auth only 755 * - RFC 2623, sec 2.3.2 756 */ 757 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 758 0, data->flags & NFS_MOUNT_NORESVPORT); 759 if (error < 0) 760 goto error; 761 nfs_mark_client_ready(clp, NFS_CS_READY); 762 return 0; 763 764 error: 765 nfs_mark_client_ready(clp, error); 766 dprintk("<-- nfs_init_client() = xerror %d\n", error); 767 return error; 768 } 769 770 /* 771 * Create a version 2 or 3 client 772 */ 773 static int nfs_init_server(struct nfs_server *server, 774 const struct nfs_parsed_mount_data *data) 775 { 776 struct nfs_client_initdata cl_init = { 777 .hostname = data->nfs_server.hostname, 778 .addr = (const struct sockaddr *)&data->nfs_server.address, 779 .addrlen = data->nfs_server.addrlen, 780 .rpc_ops = &nfs_v2_clientops, 781 .proto = data->nfs_server.protocol, 782 }; 783 struct rpc_timeout timeparms; 784 struct nfs_client *clp; 785 int error; 786 787 dprintk("--> nfs_init_server()\n"); 788 789 #ifdef CONFIG_NFS_V3 790 if (data->flags & NFS_MOUNT_VER3) 791 cl_init.rpc_ops = &nfs_v3_clientops; 792 #endif 793 794 /* Allocate or find a client reference we can use */ 795 clp = nfs_get_client(&cl_init); 796 if (IS_ERR(clp)) { 797 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 798 return PTR_ERR(clp); 799 } 800 801 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 802 data->timeo, data->retrans); 803 error = nfs_init_client(clp, &timeparms, data); 804 if (error < 0) 805 goto error; 806 807 server->nfs_client = clp; 808 809 /* Initialise the client representation from the mount data */ 810 server->flags = data->flags; 811 server->options = data->options; 812 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 813 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 814 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 815 816 if (data->rsize) 817 server->rsize = nfs_block_size(data->rsize, NULL); 818 if (data->wsize) 819 server->wsize = nfs_block_size(data->wsize, NULL); 820 821 server->acregmin = data->acregmin * HZ; 822 server->acregmax = data->acregmax * HZ; 823 server->acdirmin = data->acdirmin * HZ; 824 server->acdirmax = data->acdirmax * HZ; 825 826 /* Start lockd here, before we might error out */ 827 error = nfs_start_lockd(server); 828 if (error < 0) 829 goto error; 830 831 server->port = data->nfs_server.port; 832 833 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 834 if (error < 0) 835 goto error; 836 837 /* Preserve the values of mount_server-related mount options */ 838 if (data->mount_server.addrlen) { 839 memcpy(&server->mountd_address, &data->mount_server.address, 840 data->mount_server.addrlen); 841 server->mountd_addrlen = data->mount_server.addrlen; 842 } 843 server->mountd_version = data->mount_server.version; 844 server->mountd_port = data->mount_server.port; 845 server->mountd_protocol = data->mount_server.protocol; 846 847 server->namelen = data->namlen; 848 /* Create a client RPC handle for the NFSv3 ACL management interface */ 849 nfs_init_server_aclclient(server); 850 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 851 return 0; 852 853 error: 854 server->nfs_client = NULL; 855 nfs_put_client(clp); 856 dprintk("<-- nfs_init_server() = xerror %d\n", error); 857 return error; 858 } 859 860 /* 861 * Load up the server record from information gained in an fsinfo record 862 */ 863 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 864 { 865 unsigned long max_rpc_payload; 866 867 /* Work out a lot of parameters */ 868 if (server->rsize == 0) 869 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 870 if (server->wsize == 0) 871 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 872 873 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 874 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 875 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 876 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 877 878 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 879 if (server->rsize > max_rpc_payload) 880 server->rsize = max_rpc_payload; 881 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 882 server->rsize = NFS_MAX_FILE_IO_SIZE; 883 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 884 885 server->backing_dev_info.name = "nfs"; 886 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 887 888 if (server->wsize > max_rpc_payload) 889 server->wsize = max_rpc_payload; 890 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 891 server->wsize = NFS_MAX_FILE_IO_SIZE; 892 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 893 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 894 895 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 896 if (server->dtsize > PAGE_CACHE_SIZE) 897 server->dtsize = PAGE_CACHE_SIZE; 898 if (server->dtsize > server->rsize) 899 server->dtsize = server->rsize; 900 901 if (server->flags & NFS_MOUNT_NOAC) { 902 server->acregmin = server->acregmax = 0; 903 server->acdirmin = server->acdirmax = 0; 904 } 905 906 server->maxfilesize = fsinfo->maxfilesize; 907 908 /* We're airborne Set socket buffersize */ 909 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 910 } 911 912 /* 913 * Probe filesystem information, including the FSID on v2/v3 914 */ 915 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 916 { 917 struct nfs_fsinfo fsinfo; 918 struct nfs_client *clp = server->nfs_client; 919 int error; 920 921 dprintk("--> nfs_probe_fsinfo()\n"); 922 923 if (clp->rpc_ops->set_capabilities != NULL) { 924 error = clp->rpc_ops->set_capabilities(server, mntfh); 925 if (error < 0) 926 goto out_error; 927 } 928 929 fsinfo.fattr = fattr; 930 nfs_fattr_init(fattr); 931 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 932 if (error < 0) 933 goto out_error; 934 935 nfs_server_set_fsinfo(server, &fsinfo); 936 937 /* Get some general file system info */ 938 if (server->namelen == 0) { 939 struct nfs_pathconf pathinfo; 940 941 pathinfo.fattr = fattr; 942 nfs_fattr_init(fattr); 943 944 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 945 server->namelen = pathinfo.max_namelen; 946 } 947 948 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 949 return 0; 950 951 out_error: 952 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 953 return error; 954 } 955 956 /* 957 * Copy useful information when duplicating a server record 958 */ 959 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 960 { 961 target->flags = source->flags; 962 target->acregmin = source->acregmin; 963 target->acregmax = source->acregmax; 964 target->acdirmin = source->acdirmin; 965 target->acdirmax = source->acdirmax; 966 target->caps = source->caps; 967 } 968 969 /* 970 * Allocate and initialise a server record 971 */ 972 static struct nfs_server *nfs_alloc_server(void) 973 { 974 struct nfs_server *server; 975 976 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 977 if (!server) 978 return NULL; 979 980 server->client = server->client_acl = ERR_PTR(-EINVAL); 981 982 /* Zero out the NFS state stuff */ 983 INIT_LIST_HEAD(&server->client_link); 984 INIT_LIST_HEAD(&server->master_link); 985 986 atomic_set(&server->active, 0); 987 988 server->io_stats = nfs_alloc_iostats(); 989 if (!server->io_stats) { 990 kfree(server); 991 return NULL; 992 } 993 994 if (bdi_init(&server->backing_dev_info)) { 995 nfs_free_iostats(server->io_stats); 996 kfree(server); 997 return NULL; 998 } 999 1000 return server; 1001 } 1002 1003 /* 1004 * Free up a server record 1005 */ 1006 void nfs_free_server(struct nfs_server *server) 1007 { 1008 dprintk("--> nfs_free_server()\n"); 1009 1010 spin_lock(&nfs_client_lock); 1011 list_del(&server->client_link); 1012 list_del(&server->master_link); 1013 spin_unlock(&nfs_client_lock); 1014 1015 if (server->destroy != NULL) 1016 server->destroy(server); 1017 1018 if (!IS_ERR(server->client_acl)) 1019 rpc_shutdown_client(server->client_acl); 1020 if (!IS_ERR(server->client)) 1021 rpc_shutdown_client(server->client); 1022 1023 nfs_put_client(server->nfs_client); 1024 1025 nfs_free_iostats(server->io_stats); 1026 bdi_destroy(&server->backing_dev_info); 1027 kfree(server); 1028 nfs_release_automount_timer(); 1029 dprintk("<-- nfs_free_server()\n"); 1030 } 1031 1032 /* 1033 * Create a version 2 or 3 volume record 1034 * - keyed on server and FSID 1035 */ 1036 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1037 struct nfs_fh *mntfh) 1038 { 1039 struct nfs_server *server; 1040 struct nfs_fattr fattr; 1041 int error; 1042 1043 server = nfs_alloc_server(); 1044 if (!server) 1045 return ERR_PTR(-ENOMEM); 1046 1047 /* Get a client representation */ 1048 error = nfs_init_server(server, data); 1049 if (error < 0) 1050 goto error; 1051 1052 BUG_ON(!server->nfs_client); 1053 BUG_ON(!server->nfs_client->rpc_ops); 1054 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1055 1056 /* Probe the root fh to retrieve its FSID */ 1057 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1058 if (error < 0) 1059 goto error; 1060 if (server->nfs_client->rpc_ops->version == 3) { 1061 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1062 server->namelen = NFS3_MAXNAMLEN; 1063 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1064 server->caps |= NFS_CAP_READDIRPLUS; 1065 } else { 1066 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1067 server->namelen = NFS2_MAXNAMLEN; 1068 } 1069 1070 if (!(fattr.valid & NFS_ATTR_FATTR)) { 1071 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 1072 if (error < 0) { 1073 dprintk("nfs_create_server: getattr error = %d\n", -error); 1074 goto error; 1075 } 1076 } 1077 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 1078 1079 dprintk("Server FSID: %llx:%llx\n", 1080 (unsigned long long) server->fsid.major, 1081 (unsigned long long) server->fsid.minor); 1082 1083 spin_lock(&nfs_client_lock); 1084 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1085 list_add_tail(&server->master_link, &nfs_volume_list); 1086 spin_unlock(&nfs_client_lock); 1087 1088 server->mount_time = jiffies; 1089 return server; 1090 1091 error: 1092 nfs_free_server(server); 1093 return ERR_PTR(error); 1094 } 1095 1096 #ifdef CONFIG_NFS_V4 1097 /* 1098 * Initialize the NFS4 callback service 1099 */ 1100 static int nfs4_init_callback(struct nfs_client *clp) 1101 { 1102 int error; 1103 1104 if (clp->rpc_ops->version == 4) { 1105 if (nfs4_has_session(clp)) { 1106 error = xprt_setup_backchannel( 1107 clp->cl_rpcclient->cl_xprt, 1108 NFS41_BC_MIN_CALLBACKS); 1109 if (error < 0) 1110 return error; 1111 } 1112 1113 error = nfs_callback_up(clp->cl_minorversion, 1114 clp->cl_rpcclient->cl_xprt); 1115 if (error < 0) { 1116 dprintk("%s: failed to start callback. Error = %d\n", 1117 __func__, error); 1118 return error; 1119 } 1120 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1121 } 1122 return 0; 1123 } 1124 1125 /* 1126 * Initialize the minor version specific parts of an NFS4 client record 1127 */ 1128 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1129 { 1130 clp->cl_call_sync = _nfs4_call_sync; 1131 1132 #if defined(CONFIG_NFS_V4_1) 1133 if (clp->cl_minorversion) { 1134 struct nfs4_session *session = NULL; 1135 /* 1136 * Create the session and mark it expired. 1137 * When a SEQUENCE operation encounters the expired session 1138 * it will do session recovery to initialize it. 1139 */ 1140 session = nfs4_alloc_session(clp); 1141 if (!session) 1142 return -ENOMEM; 1143 1144 clp->cl_session = session; 1145 clp->cl_call_sync = _nfs4_call_sync_session; 1146 } 1147 #endif /* CONFIG_NFS_V4_1 */ 1148 1149 return nfs4_init_callback(clp); 1150 } 1151 1152 /* 1153 * Initialise an NFS4 client record 1154 */ 1155 static int nfs4_init_client(struct nfs_client *clp, 1156 const struct rpc_timeout *timeparms, 1157 const char *ip_addr, 1158 rpc_authflavor_t authflavour, 1159 int flags) 1160 { 1161 int error; 1162 1163 if (clp->cl_cons_state == NFS_CS_READY) { 1164 /* the client is initialised already */ 1165 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1166 return 0; 1167 } 1168 1169 /* Check NFS protocol revision and initialize RPC op vector */ 1170 clp->rpc_ops = &nfs_v4_clientops; 1171 1172 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1173 1, flags & NFS_MOUNT_NORESVPORT); 1174 if (error < 0) 1175 goto error; 1176 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1177 1178 error = nfs_idmap_new(clp); 1179 if (error < 0) { 1180 dprintk("%s: failed to create idmapper. Error = %d\n", 1181 __func__, error); 1182 goto error; 1183 } 1184 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1185 1186 error = nfs4_init_client_minor_version(clp); 1187 if (error < 0) 1188 goto error; 1189 1190 if (!nfs4_has_session(clp)) 1191 nfs_mark_client_ready(clp, NFS_CS_READY); 1192 return 0; 1193 1194 error: 1195 nfs_mark_client_ready(clp, error); 1196 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1197 return error; 1198 } 1199 1200 /* 1201 * Set up an NFS4 client 1202 */ 1203 static int nfs4_set_client(struct nfs_server *server, 1204 const char *hostname, 1205 const struct sockaddr *addr, 1206 const size_t addrlen, 1207 const char *ip_addr, 1208 rpc_authflavor_t authflavour, 1209 int proto, const struct rpc_timeout *timeparms, 1210 u32 minorversion) 1211 { 1212 struct nfs_client_initdata cl_init = { 1213 .hostname = hostname, 1214 .addr = addr, 1215 .addrlen = addrlen, 1216 .rpc_ops = &nfs_v4_clientops, 1217 .proto = proto, 1218 .minorversion = minorversion, 1219 }; 1220 struct nfs_client *clp; 1221 int error; 1222 1223 dprintk("--> nfs4_set_client()\n"); 1224 1225 /* Allocate or find a client reference we can use */ 1226 clp = nfs_get_client(&cl_init); 1227 if (IS_ERR(clp)) { 1228 error = PTR_ERR(clp); 1229 goto error; 1230 } 1231 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1232 server->flags); 1233 if (error < 0) 1234 goto error_put; 1235 1236 server->nfs_client = clp; 1237 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1238 return 0; 1239 1240 error_put: 1241 nfs_put_client(clp); 1242 error: 1243 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1244 return error; 1245 } 1246 1247 1248 /* 1249 * Session has been established, and the client marked ready. 1250 * Set the mount rsize and wsize with negotiated fore channel 1251 * attributes which will be bound checked in nfs_server_set_fsinfo. 1252 */ 1253 static void nfs4_session_set_rwsize(struct nfs_server *server) 1254 { 1255 #ifdef CONFIG_NFS_V4_1 1256 if (!nfs4_has_session(server->nfs_client)) 1257 return; 1258 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 1259 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz; 1260 #endif /* CONFIG_NFS_V4_1 */ 1261 } 1262 1263 /* 1264 * Create a version 4 volume record 1265 */ 1266 static int nfs4_init_server(struct nfs_server *server, 1267 const struct nfs_parsed_mount_data *data) 1268 { 1269 struct rpc_timeout timeparms; 1270 int error; 1271 1272 dprintk("--> nfs4_init_server()\n"); 1273 1274 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1275 data->timeo, data->retrans); 1276 1277 /* Initialise the client representation from the mount data */ 1278 server->flags = data->flags; 1279 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1280 server->options = data->options; 1281 1282 /* Get a client record */ 1283 error = nfs4_set_client(server, 1284 data->nfs_server.hostname, 1285 (const struct sockaddr *)&data->nfs_server.address, 1286 data->nfs_server.addrlen, 1287 data->client_address, 1288 data->auth_flavors[0], 1289 data->nfs_server.protocol, 1290 &timeparms, 1291 data->minorversion); 1292 if (error < 0) 1293 goto error; 1294 1295 if (data->rsize) 1296 server->rsize = nfs_block_size(data->rsize, NULL); 1297 if (data->wsize) 1298 server->wsize = nfs_block_size(data->wsize, NULL); 1299 1300 server->acregmin = data->acregmin * HZ; 1301 server->acregmax = data->acregmax * HZ; 1302 server->acdirmin = data->acdirmin * HZ; 1303 server->acdirmax = data->acdirmax * HZ; 1304 1305 server->port = data->nfs_server.port; 1306 1307 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1308 1309 error: 1310 /* Done */ 1311 dprintk("<-- nfs4_init_server() = %d\n", error); 1312 return error; 1313 } 1314 1315 /* 1316 * Create a version 4 volume record 1317 * - keyed on server and FSID 1318 */ 1319 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1320 struct nfs_fh *mntfh) 1321 { 1322 struct nfs_fattr fattr; 1323 struct nfs_server *server; 1324 int error; 1325 1326 dprintk("--> nfs4_create_server()\n"); 1327 1328 server = nfs_alloc_server(); 1329 if (!server) 1330 return ERR_PTR(-ENOMEM); 1331 1332 /* set up the general RPC client */ 1333 error = nfs4_init_server(server, data); 1334 if (error < 0) 1335 goto error; 1336 1337 BUG_ON(!server->nfs_client); 1338 BUG_ON(!server->nfs_client->rpc_ops); 1339 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1340 1341 error = nfs4_init_session(server); 1342 if (error < 0) 1343 goto error; 1344 1345 /* Probe the root fh to retrieve its FSID */ 1346 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1347 if (error < 0) 1348 goto error; 1349 1350 dprintk("Server FSID: %llx:%llx\n", 1351 (unsigned long long) server->fsid.major, 1352 (unsigned long long) server->fsid.minor); 1353 dprintk("Mount FH: %d\n", mntfh->size); 1354 1355 nfs4_session_set_rwsize(server); 1356 1357 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1358 if (error < 0) 1359 goto error; 1360 1361 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1362 server->namelen = NFS4_MAXNAMLEN; 1363 1364 spin_lock(&nfs_client_lock); 1365 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1366 list_add_tail(&server->master_link, &nfs_volume_list); 1367 spin_unlock(&nfs_client_lock); 1368 1369 server->mount_time = jiffies; 1370 dprintk("<-- nfs4_create_server() = %p\n", server); 1371 return server; 1372 1373 error: 1374 nfs_free_server(server); 1375 dprintk("<-- nfs4_create_server() = error %d\n", error); 1376 return ERR_PTR(error); 1377 } 1378 1379 /* 1380 * Create an NFS4 referral server record 1381 */ 1382 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1383 struct nfs_fh *mntfh) 1384 { 1385 struct nfs_client *parent_client; 1386 struct nfs_server *server, *parent_server; 1387 struct nfs_fattr fattr; 1388 int error; 1389 1390 dprintk("--> nfs4_create_referral_server()\n"); 1391 1392 server = nfs_alloc_server(); 1393 if (!server) 1394 return ERR_PTR(-ENOMEM); 1395 1396 parent_server = NFS_SB(data->sb); 1397 parent_client = parent_server->nfs_client; 1398 1399 /* Initialise the client representation from the parent server */ 1400 nfs_server_copy_userdata(server, parent_server); 1401 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1402 1403 /* Get a client representation. 1404 * Note: NFSv4 always uses TCP, */ 1405 error = nfs4_set_client(server, data->hostname, 1406 data->addr, 1407 data->addrlen, 1408 parent_client->cl_ipaddr, 1409 data->authflavor, 1410 parent_server->client->cl_xprt->prot, 1411 parent_server->client->cl_timeout, 1412 parent_client->cl_minorversion); 1413 if (error < 0) 1414 goto error; 1415 1416 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1417 if (error < 0) 1418 goto error; 1419 1420 BUG_ON(!server->nfs_client); 1421 BUG_ON(!server->nfs_client->rpc_ops); 1422 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1423 1424 /* Probe the root fh to retrieve its FSID and filehandle */ 1425 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1426 if (error < 0) 1427 goto error; 1428 1429 /* probe the filesystem info for this server filesystem */ 1430 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1431 if (error < 0) 1432 goto error; 1433 1434 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1435 server->namelen = NFS4_MAXNAMLEN; 1436 1437 dprintk("Referral FSID: %llx:%llx\n", 1438 (unsigned long long) server->fsid.major, 1439 (unsigned long long) server->fsid.minor); 1440 1441 spin_lock(&nfs_client_lock); 1442 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1443 list_add_tail(&server->master_link, &nfs_volume_list); 1444 spin_unlock(&nfs_client_lock); 1445 1446 server->mount_time = jiffies; 1447 1448 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1449 return server; 1450 1451 error: 1452 nfs_free_server(server); 1453 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1454 return ERR_PTR(error); 1455 } 1456 1457 #endif /* CONFIG_NFS_V4 */ 1458 1459 /* 1460 * Clone an NFS2, NFS3 or NFS4 server record 1461 */ 1462 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1463 struct nfs_fh *fh, 1464 struct nfs_fattr *fattr) 1465 { 1466 struct nfs_server *server; 1467 struct nfs_fattr fattr_fsinfo; 1468 int error; 1469 1470 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1471 (unsigned long long) fattr->fsid.major, 1472 (unsigned long long) fattr->fsid.minor); 1473 1474 server = nfs_alloc_server(); 1475 if (!server) 1476 return ERR_PTR(-ENOMEM); 1477 1478 /* Copy data from the source */ 1479 server->nfs_client = source->nfs_client; 1480 atomic_inc(&server->nfs_client->cl_count); 1481 nfs_server_copy_userdata(server, source); 1482 1483 server->fsid = fattr->fsid; 1484 1485 error = nfs_init_server_rpcclient(server, 1486 source->client->cl_timeout, 1487 source->client->cl_auth->au_flavor); 1488 if (error < 0) 1489 goto out_free_server; 1490 if (!IS_ERR(source->client_acl)) 1491 nfs_init_server_aclclient(server); 1492 1493 /* probe the filesystem info for this server filesystem */ 1494 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1495 if (error < 0) 1496 goto out_free_server; 1497 1498 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1499 server->namelen = NFS4_MAXNAMLEN; 1500 1501 dprintk("Cloned FSID: %llx:%llx\n", 1502 (unsigned long long) server->fsid.major, 1503 (unsigned long long) server->fsid.minor); 1504 1505 error = nfs_start_lockd(server); 1506 if (error < 0) 1507 goto out_free_server; 1508 1509 spin_lock(&nfs_client_lock); 1510 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1511 list_add_tail(&server->master_link, &nfs_volume_list); 1512 spin_unlock(&nfs_client_lock); 1513 1514 server->mount_time = jiffies; 1515 1516 dprintk("<-- nfs_clone_server() = %p\n", server); 1517 return server; 1518 1519 out_free_server: 1520 nfs_free_server(server); 1521 dprintk("<-- nfs_clone_server() = error %d\n", error); 1522 return ERR_PTR(error); 1523 } 1524 1525 #ifdef CONFIG_PROC_FS 1526 static struct proc_dir_entry *proc_fs_nfs; 1527 1528 static int nfs_server_list_open(struct inode *inode, struct file *file); 1529 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1530 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1531 static void nfs_server_list_stop(struct seq_file *p, void *v); 1532 static int nfs_server_list_show(struct seq_file *m, void *v); 1533 1534 static struct seq_operations nfs_server_list_ops = { 1535 .start = nfs_server_list_start, 1536 .next = nfs_server_list_next, 1537 .stop = nfs_server_list_stop, 1538 .show = nfs_server_list_show, 1539 }; 1540 1541 static const struct file_operations nfs_server_list_fops = { 1542 .open = nfs_server_list_open, 1543 .read = seq_read, 1544 .llseek = seq_lseek, 1545 .release = seq_release, 1546 .owner = THIS_MODULE, 1547 }; 1548 1549 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1550 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1551 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1552 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1553 static int nfs_volume_list_show(struct seq_file *m, void *v); 1554 1555 static struct seq_operations nfs_volume_list_ops = { 1556 .start = nfs_volume_list_start, 1557 .next = nfs_volume_list_next, 1558 .stop = nfs_volume_list_stop, 1559 .show = nfs_volume_list_show, 1560 }; 1561 1562 static const struct file_operations nfs_volume_list_fops = { 1563 .open = nfs_volume_list_open, 1564 .read = seq_read, 1565 .llseek = seq_lseek, 1566 .release = seq_release, 1567 .owner = THIS_MODULE, 1568 }; 1569 1570 /* 1571 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1572 * we're dealing 1573 */ 1574 static int nfs_server_list_open(struct inode *inode, struct file *file) 1575 { 1576 struct seq_file *m; 1577 int ret; 1578 1579 ret = seq_open(file, &nfs_server_list_ops); 1580 if (ret < 0) 1581 return ret; 1582 1583 m = file->private_data; 1584 m->private = PDE(inode)->data; 1585 1586 return 0; 1587 } 1588 1589 /* 1590 * set up the iterator to start reading from the server list and return the first item 1591 */ 1592 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1593 { 1594 /* lock the list against modification */ 1595 spin_lock(&nfs_client_lock); 1596 return seq_list_start_head(&nfs_client_list, *_pos); 1597 } 1598 1599 /* 1600 * move to next server 1601 */ 1602 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1603 { 1604 return seq_list_next(v, &nfs_client_list, pos); 1605 } 1606 1607 /* 1608 * clean up after reading from the transports list 1609 */ 1610 static void nfs_server_list_stop(struct seq_file *p, void *v) 1611 { 1612 spin_unlock(&nfs_client_lock); 1613 } 1614 1615 /* 1616 * display a header line followed by a load of call lines 1617 */ 1618 static int nfs_server_list_show(struct seq_file *m, void *v) 1619 { 1620 struct nfs_client *clp; 1621 1622 /* display header on line 1 */ 1623 if (v == &nfs_client_list) { 1624 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1625 return 0; 1626 } 1627 1628 /* display one transport per line on subsequent lines */ 1629 clp = list_entry(v, struct nfs_client, cl_share_link); 1630 1631 seq_printf(m, "v%u %s %s %3d %s\n", 1632 clp->rpc_ops->version, 1633 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1634 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1635 atomic_read(&clp->cl_count), 1636 clp->cl_hostname); 1637 1638 return 0; 1639 } 1640 1641 /* 1642 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1643 */ 1644 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1645 { 1646 struct seq_file *m; 1647 int ret; 1648 1649 ret = seq_open(file, &nfs_volume_list_ops); 1650 if (ret < 0) 1651 return ret; 1652 1653 m = file->private_data; 1654 m->private = PDE(inode)->data; 1655 1656 return 0; 1657 } 1658 1659 /* 1660 * set up the iterator to start reading from the volume list and return the first item 1661 */ 1662 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1663 { 1664 /* lock the list against modification */ 1665 spin_lock(&nfs_client_lock); 1666 return seq_list_start_head(&nfs_volume_list, *_pos); 1667 } 1668 1669 /* 1670 * move to next volume 1671 */ 1672 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1673 { 1674 return seq_list_next(v, &nfs_volume_list, pos); 1675 } 1676 1677 /* 1678 * clean up after reading from the transports list 1679 */ 1680 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1681 { 1682 spin_unlock(&nfs_client_lock); 1683 } 1684 1685 /* 1686 * display a header line followed by a load of call lines 1687 */ 1688 static int nfs_volume_list_show(struct seq_file *m, void *v) 1689 { 1690 struct nfs_server *server; 1691 struct nfs_client *clp; 1692 char dev[8], fsid[17]; 1693 1694 /* display header on line 1 */ 1695 if (v == &nfs_volume_list) { 1696 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1697 return 0; 1698 } 1699 /* display one transport per line on subsequent lines */ 1700 server = list_entry(v, struct nfs_server, master_link); 1701 clp = server->nfs_client; 1702 1703 snprintf(dev, 8, "%u:%u", 1704 MAJOR(server->s_dev), MINOR(server->s_dev)); 1705 1706 snprintf(fsid, 17, "%llx:%llx", 1707 (unsigned long long) server->fsid.major, 1708 (unsigned long long) server->fsid.minor); 1709 1710 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1711 clp->rpc_ops->version, 1712 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1713 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1714 dev, 1715 fsid, 1716 nfs_server_fscache_state(server)); 1717 1718 return 0; 1719 } 1720 1721 /* 1722 * initialise the /proc/fs/nfsfs/ directory 1723 */ 1724 int __init nfs_fs_proc_init(void) 1725 { 1726 struct proc_dir_entry *p; 1727 1728 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1729 if (!proc_fs_nfs) 1730 goto error_0; 1731 1732 /* a file of servers with which we're dealing */ 1733 p = proc_create("servers", S_IFREG|S_IRUGO, 1734 proc_fs_nfs, &nfs_server_list_fops); 1735 if (!p) 1736 goto error_1; 1737 1738 /* a file of volumes that we have mounted */ 1739 p = proc_create("volumes", S_IFREG|S_IRUGO, 1740 proc_fs_nfs, &nfs_volume_list_fops); 1741 if (!p) 1742 goto error_2; 1743 return 0; 1744 1745 error_2: 1746 remove_proc_entry("servers", proc_fs_nfs); 1747 error_1: 1748 remove_proc_entry("fs/nfsfs", NULL); 1749 error_0: 1750 return -ENOMEM; 1751 } 1752 1753 /* 1754 * clean up the /proc/fs/nfsfs/ directory 1755 */ 1756 void nfs_fs_proc_exit(void) 1757 { 1758 remove_proc_entry("volumes", proc_fs_nfs); 1759 remove_proc_entry("servers", proc_fs_nfs); 1760 remove_proc_entry("fs/nfsfs", NULL); 1761 } 1762 1763 #endif /* CONFIG_PROC_FS */ 1764