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 .nfs_version = clp->rpc_ops->version, 652 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 653 1 : 0, 654 }; 655 656 if (nlm_init.nfs_version > 3) 657 return 0; 658 if (server->flags & NFS_MOUNT_NONLM) 659 return 0; 660 661 switch (clp->cl_proto) { 662 default: 663 nlm_init.protocol = IPPROTO_TCP; 664 break; 665 case XPRT_TRANSPORT_UDP: 666 nlm_init.protocol = IPPROTO_UDP; 667 } 668 669 host = nlmclnt_init(&nlm_init); 670 if (IS_ERR(host)) 671 return PTR_ERR(host); 672 673 server->nlm_host = host; 674 server->destroy = nfs_destroy_server; 675 return 0; 676 } 677 678 /* 679 * Initialise an NFSv3 ACL client connection 680 */ 681 #ifdef CONFIG_NFS_V3_ACL 682 static void nfs_init_server_aclclient(struct nfs_server *server) 683 { 684 if (server->nfs_client->rpc_ops->version != 3) 685 goto out_noacl; 686 if (server->flags & NFS_MOUNT_NOACL) 687 goto out_noacl; 688 689 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 690 if (IS_ERR(server->client_acl)) 691 goto out_noacl; 692 693 /* No errors! Assume that Sun nfsacls are supported */ 694 server->caps |= NFS_CAP_ACLS; 695 return; 696 697 out_noacl: 698 server->caps &= ~NFS_CAP_ACLS; 699 } 700 #else 701 static inline void nfs_init_server_aclclient(struct nfs_server *server) 702 { 703 server->flags &= ~NFS_MOUNT_NOACL; 704 server->caps &= ~NFS_CAP_ACLS; 705 } 706 #endif 707 708 /* 709 * Create a general RPC client 710 */ 711 static int nfs_init_server_rpcclient(struct nfs_server *server, 712 const struct rpc_timeout *timeo, 713 rpc_authflavor_t pseudoflavour) 714 { 715 struct nfs_client *clp = server->nfs_client; 716 717 server->client = rpc_clone_client(clp->cl_rpcclient); 718 if (IS_ERR(server->client)) { 719 dprintk("%s: couldn't create rpc_client!\n", __func__); 720 return PTR_ERR(server->client); 721 } 722 723 memcpy(&server->client->cl_timeout_default, 724 timeo, 725 sizeof(server->client->cl_timeout_default)); 726 server->client->cl_timeout = &server->client->cl_timeout_default; 727 728 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 729 struct rpc_auth *auth; 730 731 auth = rpcauth_create(pseudoflavour, server->client); 732 if (IS_ERR(auth)) { 733 dprintk("%s: couldn't create credcache!\n", __func__); 734 return PTR_ERR(auth); 735 } 736 } 737 server->client->cl_softrtry = 0; 738 if (server->flags & NFS_MOUNT_SOFT) 739 server->client->cl_softrtry = 1; 740 741 return 0; 742 } 743 744 /* 745 * Initialise an NFS2 or NFS3 client 746 */ 747 static int nfs_init_client(struct nfs_client *clp, 748 const struct rpc_timeout *timeparms, 749 const struct nfs_parsed_mount_data *data) 750 { 751 int error; 752 753 if (clp->cl_cons_state == NFS_CS_READY) { 754 /* the client is already initialised */ 755 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 756 return 0; 757 } 758 759 /* 760 * Create a client RPC handle for doing FSSTAT with UNIX auth only 761 * - RFC 2623, sec 2.3.2 762 */ 763 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 764 0, data->flags & NFS_MOUNT_NORESVPORT); 765 if (error < 0) 766 goto error; 767 nfs_mark_client_ready(clp, NFS_CS_READY); 768 return 0; 769 770 error: 771 nfs_mark_client_ready(clp, error); 772 dprintk("<-- nfs_init_client() = xerror %d\n", error); 773 return error; 774 } 775 776 /* 777 * Create a version 2 or 3 client 778 */ 779 static int nfs_init_server(struct nfs_server *server, 780 const struct nfs_parsed_mount_data *data) 781 { 782 struct nfs_client_initdata cl_init = { 783 .hostname = data->nfs_server.hostname, 784 .addr = (const struct sockaddr *)&data->nfs_server.address, 785 .addrlen = data->nfs_server.addrlen, 786 .rpc_ops = &nfs_v2_clientops, 787 .proto = data->nfs_server.protocol, 788 }; 789 struct rpc_timeout timeparms; 790 struct nfs_client *clp; 791 int error; 792 793 dprintk("--> nfs_init_server()\n"); 794 795 #ifdef CONFIG_NFS_V3 796 if (data->version == 3) 797 cl_init.rpc_ops = &nfs_v3_clientops; 798 #endif 799 800 /* Allocate or find a client reference we can use */ 801 clp = nfs_get_client(&cl_init); 802 if (IS_ERR(clp)) { 803 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 804 return PTR_ERR(clp); 805 } 806 807 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 808 data->timeo, data->retrans); 809 error = nfs_init_client(clp, &timeparms, data); 810 if (error < 0) 811 goto error; 812 813 server->nfs_client = clp; 814 815 /* Initialise the client representation from the mount data */ 816 server->flags = data->flags; 817 server->options = data->options; 818 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 819 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 820 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 821 822 if (data->rsize) 823 server->rsize = nfs_block_size(data->rsize, NULL); 824 if (data->wsize) 825 server->wsize = nfs_block_size(data->wsize, NULL); 826 827 server->acregmin = data->acregmin * HZ; 828 server->acregmax = data->acregmax * HZ; 829 server->acdirmin = data->acdirmin * HZ; 830 server->acdirmax = data->acdirmax * HZ; 831 832 /* Start lockd here, before we might error out */ 833 error = nfs_start_lockd(server); 834 if (error < 0) 835 goto error; 836 837 server->port = data->nfs_server.port; 838 839 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 840 if (error < 0) 841 goto error; 842 843 /* Preserve the values of mount_server-related mount options */ 844 if (data->mount_server.addrlen) { 845 memcpy(&server->mountd_address, &data->mount_server.address, 846 data->mount_server.addrlen); 847 server->mountd_addrlen = data->mount_server.addrlen; 848 } 849 server->mountd_version = data->mount_server.version; 850 server->mountd_port = data->mount_server.port; 851 server->mountd_protocol = data->mount_server.protocol; 852 853 server->namelen = data->namlen; 854 /* Create a client RPC handle for the NFSv3 ACL management interface */ 855 nfs_init_server_aclclient(server); 856 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 857 return 0; 858 859 error: 860 server->nfs_client = NULL; 861 nfs_put_client(clp); 862 dprintk("<-- nfs_init_server() = xerror %d\n", error); 863 return error; 864 } 865 866 /* 867 * Load up the server record from information gained in an fsinfo record 868 */ 869 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 870 { 871 unsigned long max_rpc_payload; 872 873 /* Work out a lot of parameters */ 874 if (server->rsize == 0) 875 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 876 if (server->wsize == 0) 877 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 878 879 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 880 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 881 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 882 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 883 884 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 885 if (server->rsize > max_rpc_payload) 886 server->rsize = max_rpc_payload; 887 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 888 server->rsize = NFS_MAX_FILE_IO_SIZE; 889 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 890 891 server->backing_dev_info.name = "nfs"; 892 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 893 894 if (server->wsize > max_rpc_payload) 895 server->wsize = max_rpc_payload; 896 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 897 server->wsize = NFS_MAX_FILE_IO_SIZE; 898 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 899 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 900 901 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 902 if (server->dtsize > PAGE_CACHE_SIZE) 903 server->dtsize = PAGE_CACHE_SIZE; 904 if (server->dtsize > server->rsize) 905 server->dtsize = server->rsize; 906 907 if (server->flags & NFS_MOUNT_NOAC) { 908 server->acregmin = server->acregmax = 0; 909 server->acdirmin = server->acdirmax = 0; 910 } 911 912 server->maxfilesize = fsinfo->maxfilesize; 913 914 /* We're airborne Set socket buffersize */ 915 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 916 } 917 918 /* 919 * Probe filesystem information, including the FSID on v2/v3 920 */ 921 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 922 { 923 struct nfs_fsinfo fsinfo; 924 struct nfs_client *clp = server->nfs_client; 925 int error; 926 927 dprintk("--> nfs_probe_fsinfo()\n"); 928 929 if (clp->rpc_ops->set_capabilities != NULL) { 930 error = clp->rpc_ops->set_capabilities(server, mntfh); 931 if (error < 0) 932 goto out_error; 933 } 934 935 fsinfo.fattr = fattr; 936 nfs_fattr_init(fattr); 937 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 938 if (error < 0) 939 goto out_error; 940 941 nfs_server_set_fsinfo(server, &fsinfo); 942 943 /* Get some general file system info */ 944 if (server->namelen == 0) { 945 struct nfs_pathconf pathinfo; 946 947 pathinfo.fattr = fattr; 948 nfs_fattr_init(fattr); 949 950 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 951 server->namelen = pathinfo.max_namelen; 952 } 953 954 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 955 return 0; 956 957 out_error: 958 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 959 return error; 960 } 961 962 /* 963 * Copy useful information when duplicating a server record 964 */ 965 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 966 { 967 target->flags = source->flags; 968 target->acregmin = source->acregmin; 969 target->acregmax = source->acregmax; 970 target->acdirmin = source->acdirmin; 971 target->acdirmax = source->acdirmax; 972 target->caps = source->caps; 973 target->options = source->options; 974 } 975 976 /* 977 * Allocate and initialise a server record 978 */ 979 static struct nfs_server *nfs_alloc_server(void) 980 { 981 struct nfs_server *server; 982 983 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 984 if (!server) 985 return NULL; 986 987 server->client = server->client_acl = ERR_PTR(-EINVAL); 988 989 /* Zero out the NFS state stuff */ 990 INIT_LIST_HEAD(&server->client_link); 991 INIT_LIST_HEAD(&server->master_link); 992 993 atomic_set(&server->active, 0); 994 995 server->io_stats = nfs_alloc_iostats(); 996 if (!server->io_stats) { 997 kfree(server); 998 return NULL; 999 } 1000 1001 if (bdi_init(&server->backing_dev_info)) { 1002 nfs_free_iostats(server->io_stats); 1003 kfree(server); 1004 return NULL; 1005 } 1006 1007 return server; 1008 } 1009 1010 /* 1011 * Free up a server record 1012 */ 1013 void nfs_free_server(struct nfs_server *server) 1014 { 1015 dprintk("--> nfs_free_server()\n"); 1016 1017 spin_lock(&nfs_client_lock); 1018 list_del(&server->client_link); 1019 list_del(&server->master_link); 1020 spin_unlock(&nfs_client_lock); 1021 1022 if (server->destroy != NULL) 1023 server->destroy(server); 1024 1025 if (!IS_ERR(server->client_acl)) 1026 rpc_shutdown_client(server->client_acl); 1027 if (!IS_ERR(server->client)) 1028 rpc_shutdown_client(server->client); 1029 1030 nfs_put_client(server->nfs_client); 1031 1032 nfs_free_iostats(server->io_stats); 1033 bdi_destroy(&server->backing_dev_info); 1034 kfree(server); 1035 nfs_release_automount_timer(); 1036 dprintk("<-- nfs_free_server()\n"); 1037 } 1038 1039 /* 1040 * Create a version 2 or 3 volume record 1041 * - keyed on server and FSID 1042 */ 1043 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1044 struct nfs_fh *mntfh) 1045 { 1046 struct nfs_server *server; 1047 struct nfs_fattr fattr; 1048 int error; 1049 1050 server = nfs_alloc_server(); 1051 if (!server) 1052 return ERR_PTR(-ENOMEM); 1053 1054 /* Get a client representation */ 1055 error = nfs_init_server(server, data); 1056 if (error < 0) 1057 goto error; 1058 1059 BUG_ON(!server->nfs_client); 1060 BUG_ON(!server->nfs_client->rpc_ops); 1061 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1062 1063 /* Probe the root fh to retrieve its FSID */ 1064 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1065 if (error < 0) 1066 goto error; 1067 if (server->nfs_client->rpc_ops->version == 3) { 1068 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1069 server->namelen = NFS3_MAXNAMLEN; 1070 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1071 server->caps |= NFS_CAP_READDIRPLUS; 1072 } else { 1073 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1074 server->namelen = NFS2_MAXNAMLEN; 1075 } 1076 1077 if (!(fattr.valid & NFS_ATTR_FATTR)) { 1078 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 1079 if (error < 0) { 1080 dprintk("nfs_create_server: getattr error = %d\n", -error); 1081 goto error; 1082 } 1083 } 1084 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 1085 1086 dprintk("Server FSID: %llx:%llx\n", 1087 (unsigned long long) server->fsid.major, 1088 (unsigned long long) server->fsid.minor); 1089 1090 spin_lock(&nfs_client_lock); 1091 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1092 list_add_tail(&server->master_link, &nfs_volume_list); 1093 spin_unlock(&nfs_client_lock); 1094 1095 server->mount_time = jiffies; 1096 return server; 1097 1098 error: 1099 nfs_free_server(server); 1100 return ERR_PTR(error); 1101 } 1102 1103 #ifdef CONFIG_NFS_V4 1104 /* 1105 * Initialize the NFS4 callback service 1106 */ 1107 static int nfs4_init_callback(struct nfs_client *clp) 1108 { 1109 int error; 1110 1111 if (clp->rpc_ops->version == 4) { 1112 if (nfs4_has_session(clp)) { 1113 error = xprt_setup_backchannel( 1114 clp->cl_rpcclient->cl_xprt, 1115 NFS41_BC_MIN_CALLBACKS); 1116 if (error < 0) 1117 return error; 1118 } 1119 1120 error = nfs_callback_up(clp->cl_minorversion, 1121 clp->cl_rpcclient->cl_xprt); 1122 if (error < 0) { 1123 dprintk("%s: failed to start callback. Error = %d\n", 1124 __func__, error); 1125 return error; 1126 } 1127 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1128 } 1129 return 0; 1130 } 1131 1132 /* 1133 * Initialize the minor version specific parts of an NFS4 client record 1134 */ 1135 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1136 { 1137 clp->cl_call_sync = _nfs4_call_sync; 1138 1139 #if defined(CONFIG_NFS_V4_1) 1140 if (clp->cl_minorversion) { 1141 struct nfs4_session *session = NULL; 1142 /* 1143 * Create the session and mark it expired. 1144 * When a SEQUENCE operation encounters the expired session 1145 * it will do session recovery to initialize it. 1146 */ 1147 session = nfs4_alloc_session(clp); 1148 if (!session) 1149 return -ENOMEM; 1150 1151 clp->cl_session = session; 1152 clp->cl_call_sync = _nfs4_call_sync_session; 1153 } 1154 #endif /* CONFIG_NFS_V4_1 */ 1155 1156 return nfs4_init_callback(clp); 1157 } 1158 1159 /* 1160 * Initialise an NFS4 client record 1161 */ 1162 static int nfs4_init_client(struct nfs_client *clp, 1163 const struct rpc_timeout *timeparms, 1164 const char *ip_addr, 1165 rpc_authflavor_t authflavour, 1166 int flags) 1167 { 1168 int error; 1169 1170 if (clp->cl_cons_state == NFS_CS_READY) { 1171 /* the client is initialised already */ 1172 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1173 return 0; 1174 } 1175 1176 /* Check NFS protocol revision and initialize RPC op vector */ 1177 clp->rpc_ops = &nfs_v4_clientops; 1178 1179 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1180 1, flags & NFS_MOUNT_NORESVPORT); 1181 if (error < 0) 1182 goto error; 1183 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1184 1185 error = nfs_idmap_new(clp); 1186 if (error < 0) { 1187 dprintk("%s: failed to create idmapper. Error = %d\n", 1188 __func__, error); 1189 goto error; 1190 } 1191 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1192 1193 error = nfs4_init_client_minor_version(clp); 1194 if (error < 0) 1195 goto error; 1196 1197 if (!nfs4_has_session(clp)) 1198 nfs_mark_client_ready(clp, NFS_CS_READY); 1199 return 0; 1200 1201 error: 1202 nfs_mark_client_ready(clp, error); 1203 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1204 return error; 1205 } 1206 1207 /* 1208 * Set up an NFS4 client 1209 */ 1210 static int nfs4_set_client(struct nfs_server *server, 1211 const char *hostname, 1212 const struct sockaddr *addr, 1213 const size_t addrlen, 1214 const char *ip_addr, 1215 rpc_authflavor_t authflavour, 1216 int proto, const struct rpc_timeout *timeparms, 1217 u32 minorversion) 1218 { 1219 struct nfs_client_initdata cl_init = { 1220 .hostname = hostname, 1221 .addr = addr, 1222 .addrlen = addrlen, 1223 .rpc_ops = &nfs_v4_clientops, 1224 .proto = proto, 1225 .minorversion = minorversion, 1226 }; 1227 struct nfs_client *clp; 1228 int error; 1229 1230 dprintk("--> nfs4_set_client()\n"); 1231 1232 /* Allocate or find a client reference we can use */ 1233 clp = nfs_get_client(&cl_init); 1234 if (IS_ERR(clp)) { 1235 error = PTR_ERR(clp); 1236 goto error; 1237 } 1238 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1239 server->flags); 1240 if (error < 0) 1241 goto error_put; 1242 1243 server->nfs_client = clp; 1244 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1245 return 0; 1246 1247 error_put: 1248 nfs_put_client(clp); 1249 error: 1250 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1251 return error; 1252 } 1253 1254 1255 /* 1256 * Session has been established, and the client marked ready. 1257 * Set the mount rsize and wsize with negotiated fore channel 1258 * attributes which will be bound checked in nfs_server_set_fsinfo. 1259 */ 1260 static void nfs4_session_set_rwsize(struct nfs_server *server) 1261 { 1262 #ifdef CONFIG_NFS_V4_1 1263 if (!nfs4_has_session(server->nfs_client)) 1264 return; 1265 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 1266 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz; 1267 #endif /* CONFIG_NFS_V4_1 */ 1268 } 1269 1270 /* 1271 * Create a version 4 volume record 1272 */ 1273 static int nfs4_init_server(struct nfs_server *server, 1274 const struct nfs_parsed_mount_data *data) 1275 { 1276 struct rpc_timeout timeparms; 1277 int error; 1278 1279 dprintk("--> nfs4_init_server()\n"); 1280 1281 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1282 data->timeo, data->retrans); 1283 1284 /* Initialise the client representation from the mount data */ 1285 server->flags = data->flags; 1286 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1287 server->options = data->options; 1288 1289 /* Get a client record */ 1290 error = nfs4_set_client(server, 1291 data->nfs_server.hostname, 1292 (const struct sockaddr *)&data->nfs_server.address, 1293 data->nfs_server.addrlen, 1294 data->client_address, 1295 data->auth_flavors[0], 1296 data->nfs_server.protocol, 1297 &timeparms, 1298 data->minorversion); 1299 if (error < 0) 1300 goto error; 1301 1302 if (data->rsize) 1303 server->rsize = nfs_block_size(data->rsize, NULL); 1304 if (data->wsize) 1305 server->wsize = nfs_block_size(data->wsize, NULL); 1306 1307 server->acregmin = data->acregmin * HZ; 1308 server->acregmax = data->acregmax * HZ; 1309 server->acdirmin = data->acdirmin * HZ; 1310 server->acdirmax = data->acdirmax * HZ; 1311 1312 server->port = data->nfs_server.port; 1313 1314 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1315 1316 error: 1317 /* Done */ 1318 dprintk("<-- nfs4_init_server() = %d\n", error); 1319 return error; 1320 } 1321 1322 /* 1323 * Create a version 4 volume record 1324 * - keyed on server and FSID 1325 */ 1326 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1327 struct nfs_fh *mntfh) 1328 { 1329 struct nfs_fattr fattr; 1330 struct nfs_server *server; 1331 int error; 1332 1333 dprintk("--> nfs4_create_server()\n"); 1334 1335 server = nfs_alloc_server(); 1336 if (!server) 1337 return ERR_PTR(-ENOMEM); 1338 1339 /* set up the general RPC client */ 1340 error = nfs4_init_server(server, data); 1341 if (error < 0) 1342 goto error; 1343 1344 BUG_ON(!server->nfs_client); 1345 BUG_ON(!server->nfs_client->rpc_ops); 1346 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1347 1348 error = nfs4_init_session(server); 1349 if (error < 0) 1350 goto error; 1351 1352 /* Probe the root fh to retrieve its FSID */ 1353 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1354 if (error < 0) 1355 goto error; 1356 1357 dprintk("Server FSID: %llx:%llx\n", 1358 (unsigned long long) server->fsid.major, 1359 (unsigned long long) server->fsid.minor); 1360 dprintk("Mount FH: %d\n", mntfh->size); 1361 1362 nfs4_session_set_rwsize(server); 1363 1364 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1365 if (error < 0) 1366 goto error; 1367 1368 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1369 server->namelen = NFS4_MAXNAMLEN; 1370 1371 spin_lock(&nfs_client_lock); 1372 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1373 list_add_tail(&server->master_link, &nfs_volume_list); 1374 spin_unlock(&nfs_client_lock); 1375 1376 server->mount_time = jiffies; 1377 dprintk("<-- nfs4_create_server() = %p\n", server); 1378 return server; 1379 1380 error: 1381 nfs_free_server(server); 1382 dprintk("<-- nfs4_create_server() = error %d\n", error); 1383 return ERR_PTR(error); 1384 } 1385 1386 /* 1387 * Create an NFS4 referral server record 1388 */ 1389 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1390 struct nfs_fh *mntfh) 1391 { 1392 struct nfs_client *parent_client; 1393 struct nfs_server *server, *parent_server; 1394 struct nfs_fattr fattr; 1395 int error; 1396 1397 dprintk("--> nfs4_create_referral_server()\n"); 1398 1399 server = nfs_alloc_server(); 1400 if (!server) 1401 return ERR_PTR(-ENOMEM); 1402 1403 parent_server = NFS_SB(data->sb); 1404 parent_client = parent_server->nfs_client; 1405 1406 /* Initialise the client representation from the parent server */ 1407 nfs_server_copy_userdata(server, parent_server); 1408 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1409 1410 /* Get a client representation. 1411 * Note: NFSv4 always uses TCP, */ 1412 error = nfs4_set_client(server, data->hostname, 1413 data->addr, 1414 data->addrlen, 1415 parent_client->cl_ipaddr, 1416 data->authflavor, 1417 parent_server->client->cl_xprt->prot, 1418 parent_server->client->cl_timeout, 1419 parent_client->cl_minorversion); 1420 if (error < 0) 1421 goto error; 1422 1423 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1424 if (error < 0) 1425 goto error; 1426 1427 BUG_ON(!server->nfs_client); 1428 BUG_ON(!server->nfs_client->rpc_ops); 1429 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1430 1431 /* Probe the root fh to retrieve its FSID and filehandle */ 1432 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1433 if (error < 0) 1434 goto error; 1435 1436 /* probe the filesystem info for this server filesystem */ 1437 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1438 if (error < 0) 1439 goto error; 1440 1441 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1442 server->namelen = NFS4_MAXNAMLEN; 1443 1444 dprintk("Referral FSID: %llx:%llx\n", 1445 (unsigned long long) server->fsid.major, 1446 (unsigned long long) server->fsid.minor); 1447 1448 spin_lock(&nfs_client_lock); 1449 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1450 list_add_tail(&server->master_link, &nfs_volume_list); 1451 spin_unlock(&nfs_client_lock); 1452 1453 server->mount_time = jiffies; 1454 1455 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1456 return server; 1457 1458 error: 1459 nfs_free_server(server); 1460 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1461 return ERR_PTR(error); 1462 } 1463 1464 #endif /* CONFIG_NFS_V4 */ 1465 1466 /* 1467 * Clone an NFS2, NFS3 or NFS4 server record 1468 */ 1469 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1470 struct nfs_fh *fh, 1471 struct nfs_fattr *fattr) 1472 { 1473 struct nfs_server *server; 1474 struct nfs_fattr fattr_fsinfo; 1475 int error; 1476 1477 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1478 (unsigned long long) fattr->fsid.major, 1479 (unsigned long long) fattr->fsid.minor); 1480 1481 server = nfs_alloc_server(); 1482 if (!server) 1483 return ERR_PTR(-ENOMEM); 1484 1485 /* Copy data from the source */ 1486 server->nfs_client = source->nfs_client; 1487 atomic_inc(&server->nfs_client->cl_count); 1488 nfs_server_copy_userdata(server, source); 1489 1490 server->fsid = fattr->fsid; 1491 1492 error = nfs_init_server_rpcclient(server, 1493 source->client->cl_timeout, 1494 source->client->cl_auth->au_flavor); 1495 if (error < 0) 1496 goto out_free_server; 1497 if (!IS_ERR(source->client_acl)) 1498 nfs_init_server_aclclient(server); 1499 1500 /* probe the filesystem info for this server filesystem */ 1501 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1502 if (error < 0) 1503 goto out_free_server; 1504 1505 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1506 server->namelen = NFS4_MAXNAMLEN; 1507 1508 dprintk("Cloned FSID: %llx:%llx\n", 1509 (unsigned long long) server->fsid.major, 1510 (unsigned long long) server->fsid.minor); 1511 1512 error = nfs_start_lockd(server); 1513 if (error < 0) 1514 goto out_free_server; 1515 1516 spin_lock(&nfs_client_lock); 1517 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1518 list_add_tail(&server->master_link, &nfs_volume_list); 1519 spin_unlock(&nfs_client_lock); 1520 1521 server->mount_time = jiffies; 1522 1523 dprintk("<-- nfs_clone_server() = %p\n", server); 1524 return server; 1525 1526 out_free_server: 1527 nfs_free_server(server); 1528 dprintk("<-- nfs_clone_server() = error %d\n", error); 1529 return ERR_PTR(error); 1530 } 1531 1532 #ifdef CONFIG_PROC_FS 1533 static struct proc_dir_entry *proc_fs_nfs; 1534 1535 static int nfs_server_list_open(struct inode *inode, struct file *file); 1536 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1537 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1538 static void nfs_server_list_stop(struct seq_file *p, void *v); 1539 static int nfs_server_list_show(struct seq_file *m, void *v); 1540 1541 static const struct seq_operations nfs_server_list_ops = { 1542 .start = nfs_server_list_start, 1543 .next = nfs_server_list_next, 1544 .stop = nfs_server_list_stop, 1545 .show = nfs_server_list_show, 1546 }; 1547 1548 static const struct file_operations nfs_server_list_fops = { 1549 .open = nfs_server_list_open, 1550 .read = seq_read, 1551 .llseek = seq_lseek, 1552 .release = seq_release, 1553 .owner = THIS_MODULE, 1554 }; 1555 1556 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1557 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1558 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1559 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1560 static int nfs_volume_list_show(struct seq_file *m, void *v); 1561 1562 static const struct seq_operations nfs_volume_list_ops = { 1563 .start = nfs_volume_list_start, 1564 .next = nfs_volume_list_next, 1565 .stop = nfs_volume_list_stop, 1566 .show = nfs_volume_list_show, 1567 }; 1568 1569 static const struct file_operations nfs_volume_list_fops = { 1570 .open = nfs_volume_list_open, 1571 .read = seq_read, 1572 .llseek = seq_lseek, 1573 .release = seq_release, 1574 .owner = THIS_MODULE, 1575 }; 1576 1577 /* 1578 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1579 * we're dealing 1580 */ 1581 static int nfs_server_list_open(struct inode *inode, struct file *file) 1582 { 1583 struct seq_file *m; 1584 int ret; 1585 1586 ret = seq_open(file, &nfs_server_list_ops); 1587 if (ret < 0) 1588 return ret; 1589 1590 m = file->private_data; 1591 m->private = PDE(inode)->data; 1592 1593 return 0; 1594 } 1595 1596 /* 1597 * set up the iterator to start reading from the server list and return the first item 1598 */ 1599 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1600 { 1601 /* lock the list against modification */ 1602 spin_lock(&nfs_client_lock); 1603 return seq_list_start_head(&nfs_client_list, *_pos); 1604 } 1605 1606 /* 1607 * move to next server 1608 */ 1609 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1610 { 1611 return seq_list_next(v, &nfs_client_list, pos); 1612 } 1613 1614 /* 1615 * clean up after reading from the transports list 1616 */ 1617 static void nfs_server_list_stop(struct seq_file *p, void *v) 1618 { 1619 spin_unlock(&nfs_client_lock); 1620 } 1621 1622 /* 1623 * display a header line followed by a load of call lines 1624 */ 1625 static int nfs_server_list_show(struct seq_file *m, void *v) 1626 { 1627 struct nfs_client *clp; 1628 1629 /* display header on line 1 */ 1630 if (v == &nfs_client_list) { 1631 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1632 return 0; 1633 } 1634 1635 /* display one transport per line on subsequent lines */ 1636 clp = list_entry(v, struct nfs_client, cl_share_link); 1637 1638 seq_printf(m, "v%u %s %s %3d %s\n", 1639 clp->rpc_ops->version, 1640 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1641 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1642 atomic_read(&clp->cl_count), 1643 clp->cl_hostname); 1644 1645 return 0; 1646 } 1647 1648 /* 1649 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1650 */ 1651 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1652 { 1653 struct seq_file *m; 1654 int ret; 1655 1656 ret = seq_open(file, &nfs_volume_list_ops); 1657 if (ret < 0) 1658 return ret; 1659 1660 m = file->private_data; 1661 m->private = PDE(inode)->data; 1662 1663 return 0; 1664 } 1665 1666 /* 1667 * set up the iterator to start reading from the volume list and return the first item 1668 */ 1669 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1670 { 1671 /* lock the list against modification */ 1672 spin_lock(&nfs_client_lock); 1673 return seq_list_start_head(&nfs_volume_list, *_pos); 1674 } 1675 1676 /* 1677 * move to next volume 1678 */ 1679 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1680 { 1681 return seq_list_next(v, &nfs_volume_list, pos); 1682 } 1683 1684 /* 1685 * clean up after reading from the transports list 1686 */ 1687 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1688 { 1689 spin_unlock(&nfs_client_lock); 1690 } 1691 1692 /* 1693 * display a header line followed by a load of call lines 1694 */ 1695 static int nfs_volume_list_show(struct seq_file *m, void *v) 1696 { 1697 struct nfs_server *server; 1698 struct nfs_client *clp; 1699 char dev[8], fsid[17]; 1700 1701 /* display header on line 1 */ 1702 if (v == &nfs_volume_list) { 1703 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1704 return 0; 1705 } 1706 /* display one transport per line on subsequent lines */ 1707 server = list_entry(v, struct nfs_server, master_link); 1708 clp = server->nfs_client; 1709 1710 snprintf(dev, 8, "%u:%u", 1711 MAJOR(server->s_dev), MINOR(server->s_dev)); 1712 1713 snprintf(fsid, 17, "%llx:%llx", 1714 (unsigned long long) server->fsid.major, 1715 (unsigned long long) server->fsid.minor); 1716 1717 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1718 clp->rpc_ops->version, 1719 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1720 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1721 dev, 1722 fsid, 1723 nfs_server_fscache_state(server)); 1724 1725 return 0; 1726 } 1727 1728 /* 1729 * initialise the /proc/fs/nfsfs/ directory 1730 */ 1731 int __init nfs_fs_proc_init(void) 1732 { 1733 struct proc_dir_entry *p; 1734 1735 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1736 if (!proc_fs_nfs) 1737 goto error_0; 1738 1739 /* a file of servers with which we're dealing */ 1740 p = proc_create("servers", S_IFREG|S_IRUGO, 1741 proc_fs_nfs, &nfs_server_list_fops); 1742 if (!p) 1743 goto error_1; 1744 1745 /* a file of volumes that we have mounted */ 1746 p = proc_create("volumes", S_IFREG|S_IRUGO, 1747 proc_fs_nfs, &nfs_volume_list_fops); 1748 if (!p) 1749 goto error_2; 1750 return 0; 1751 1752 error_2: 1753 remove_proc_entry("servers", proc_fs_nfs); 1754 error_1: 1755 remove_proc_entry("fs/nfsfs", NULL); 1756 error_0: 1757 return -ENOMEM; 1758 } 1759 1760 /* 1761 * clean up the /proc/fs/nfsfs/ directory 1762 */ 1763 void nfs_fs_proc_exit(void) 1764 { 1765 remove_proc_entry("volumes", proc_fs_nfs); 1766 remove_proc_entry("servers", proc_fs_nfs); 1767 remove_proc_entry("fs/nfsfs", NULL); 1768 } 1769 1770 #endif /* CONFIG_PROC_FS */ 1771