1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <net/ipv6.h> 40 #include <linux/nfs_xdr.h> 41 #include <linux/sunrpc/bc_xprt.h> 42 43 #include <asm/system.h> 44 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "pnfs.h" 52 53 #define NFSDBG_FACILITY NFSDBG_CLIENT 54 55 static DEFINE_SPINLOCK(nfs_client_lock); 56 static LIST_HEAD(nfs_client_list); 57 static LIST_HEAD(nfs_volume_list); 58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 59 60 /* 61 * RPC cruft for NFS 62 */ 63 static struct rpc_version *nfs_version[5] = { 64 [2] = &nfs_version2, 65 #ifdef CONFIG_NFS_V3 66 [3] = &nfs_version3, 67 #endif 68 #ifdef CONFIG_NFS_V4 69 [4] = &nfs_version4, 70 #endif 71 }; 72 73 struct rpc_program nfs_program = { 74 .name = "nfs", 75 .number = NFS_PROGRAM, 76 .nrvers = ARRAY_SIZE(nfs_version), 77 .version = nfs_version, 78 .stats = &nfs_rpcstat, 79 .pipe_dir_name = "/nfs", 80 }; 81 82 struct rpc_stat nfs_rpcstat = { 83 .program = &nfs_program 84 }; 85 86 87 #ifdef CONFIG_NFS_V3_ACL 88 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 89 static struct rpc_version * nfsacl_version[] = { 90 [3] = &nfsacl_version3, 91 }; 92 93 struct rpc_program nfsacl_program = { 94 .name = "nfsacl", 95 .number = NFS_ACL_PROGRAM, 96 .nrvers = ARRAY_SIZE(nfsacl_version), 97 .version = nfsacl_version, 98 .stats = &nfsacl_rpcstat, 99 }; 100 #endif /* CONFIG_NFS_V3_ACL */ 101 102 struct nfs_client_initdata { 103 const char *hostname; 104 const struct sockaddr *addr; 105 size_t addrlen; 106 const struct nfs_rpc_ops *rpc_ops; 107 int proto; 108 u32 minorversion; 109 }; 110 111 /* 112 * Allocate a shared client record 113 * 114 * Since these are allocated/deallocated very rarely, we don't 115 * bother putting them in a slab cache... 116 */ 117 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 118 { 119 struct nfs_client *clp; 120 struct rpc_cred *cred; 121 int err = -ENOMEM; 122 123 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 124 goto error_0; 125 126 clp->rpc_ops = cl_init->rpc_ops; 127 128 atomic_set(&clp->cl_count, 1); 129 clp->cl_cons_state = NFS_CS_INITING; 130 131 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 132 clp->cl_addrlen = cl_init->addrlen; 133 134 if (cl_init->hostname) { 135 err = -ENOMEM; 136 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 137 if (!clp->cl_hostname) 138 goto error_cleanup; 139 } 140 141 INIT_LIST_HEAD(&clp->cl_superblocks); 142 clp->cl_rpcclient = ERR_PTR(-EINVAL); 143 144 clp->cl_proto = cl_init->proto; 145 146 #ifdef CONFIG_NFS_V4 147 INIT_LIST_HEAD(&clp->cl_delegations); 148 spin_lock_init(&clp->cl_lock); 149 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 150 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 151 clp->cl_boot_time = CURRENT_TIME; 152 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 153 clp->cl_minorversion = cl_init->minorversion; 154 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 155 #endif 156 cred = rpc_lookup_machine_cred(); 157 if (!IS_ERR(cred)) 158 clp->cl_machine_cred = cred; 159 #if defined(CONFIG_NFS_V4_1) 160 INIT_LIST_HEAD(&clp->cl_layouts); 161 #endif 162 nfs_fscache_get_client_cookie(clp); 163 164 return clp; 165 166 error_cleanup: 167 kfree(clp); 168 error_0: 169 return ERR_PTR(err); 170 } 171 172 #ifdef CONFIG_NFS_V4 173 /* 174 * Clears/puts all minor version specific parts from an nfs_client struct 175 * reverting it to minorversion 0. 176 */ 177 static void nfs4_clear_client_minor_version(struct nfs_client *clp) 178 { 179 #ifdef CONFIG_NFS_V4_1 180 if (nfs4_has_session(clp)) { 181 nfs4_destroy_session(clp->cl_session); 182 clp->cl_session = NULL; 183 } 184 185 clp->cl_mvops = nfs_v4_minor_ops[0]; 186 #endif /* CONFIG_NFS_V4_1 */ 187 } 188 189 /* 190 * Destroy the NFS4 callback service 191 */ 192 static void nfs4_destroy_callback(struct nfs_client *clp) 193 { 194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 195 nfs_callback_down(clp->cl_mvops->minor_version); 196 } 197 198 static void nfs4_shutdown_client(struct nfs_client *clp) 199 { 200 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 201 nfs4_kill_renewd(clp); 202 nfs4_clear_client_minor_version(clp); 203 nfs4_destroy_callback(clp); 204 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 205 nfs_idmap_delete(clp); 206 207 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 208 } 209 #else 210 static void nfs4_shutdown_client(struct nfs_client *clp) 211 { 212 } 213 #endif /* CONFIG_NFS_V4 */ 214 215 /* 216 * Destroy a shared client record 217 */ 218 static void nfs_free_client(struct nfs_client *clp) 219 { 220 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 221 222 nfs4_shutdown_client(clp); 223 224 nfs_fscache_release_client_cookie(clp); 225 226 /* -EIO all pending I/O */ 227 if (!IS_ERR(clp->cl_rpcclient)) 228 rpc_shutdown_client(clp->cl_rpcclient); 229 230 if (clp->cl_machine_cred != NULL) 231 put_rpccred(clp->cl_machine_cred); 232 233 kfree(clp->cl_hostname); 234 kfree(clp); 235 236 dprintk("<-- nfs_free_client()\n"); 237 } 238 239 /* 240 * Release a reference to a shared client record 241 */ 242 void nfs_put_client(struct nfs_client *clp) 243 { 244 if (!clp) 245 return; 246 247 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 248 249 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 250 list_del(&clp->cl_share_link); 251 spin_unlock(&nfs_client_lock); 252 253 BUG_ON(!list_empty(&clp->cl_superblocks)); 254 255 nfs_free_client(clp); 256 } 257 } 258 EXPORT_SYMBOL_GPL(nfs_put_client); 259 260 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 261 /* 262 * Test if two ip6 socket addresses refer to the same socket by 263 * comparing relevant fields. The padding bytes specifically, are not 264 * compared. sin6_flowinfo is not compared because it only affects QoS 265 * and sin6_scope_id is only compared if the address is "link local" 266 * because "link local" addresses need only be unique to a specific 267 * link. Conversely, ordinary unicast addresses might have different 268 * sin6_scope_id. 269 * 270 * The caller should ensure both socket addresses are AF_INET6. 271 */ 272 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 273 const struct sockaddr *sa2) 274 { 275 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 276 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 277 278 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 279 sin1->sin6_scope_id != sin2->sin6_scope_id) 280 return 0; 281 282 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); 283 } 284 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 285 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 286 const struct sockaddr *sa2) 287 { 288 return 0; 289 } 290 #endif 291 292 /* 293 * Test if two ip4 socket addresses refer to the same socket, by 294 * comparing relevant fields. The padding bytes specifically, are 295 * not compared. 296 * 297 * The caller should ensure both socket addresses are AF_INET. 298 */ 299 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 300 const struct sockaddr *sa2) 301 { 302 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 303 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 304 305 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 306 } 307 308 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 309 const struct sockaddr *sa2) 310 { 311 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 312 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 313 314 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 315 (sin1->sin6_port == sin2->sin6_port); 316 } 317 318 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 319 const struct sockaddr *sa2) 320 { 321 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 322 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 323 324 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 325 (sin1->sin_port == sin2->sin_port); 326 } 327 328 /* 329 * Test if two socket addresses represent the same actual socket, 330 * by comparing (only) relevant fields, excluding the port number. 331 */ 332 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 333 const struct sockaddr *sa2) 334 { 335 if (sa1->sa_family != sa2->sa_family) 336 return 0; 337 338 switch (sa1->sa_family) { 339 case AF_INET: 340 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 341 case AF_INET6: 342 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 343 } 344 return 0; 345 } 346 347 /* 348 * Test if two socket addresses represent the same actual socket, 349 * by comparing (only) relevant fields, including the port number. 350 */ 351 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 352 const struct sockaddr *sa2) 353 { 354 if (sa1->sa_family != sa2->sa_family) 355 return 0; 356 357 switch (sa1->sa_family) { 358 case AF_INET: 359 return nfs_sockaddr_cmp_ip4(sa1, sa2); 360 case AF_INET6: 361 return nfs_sockaddr_cmp_ip6(sa1, sa2); 362 } 363 return 0; 364 } 365 366 /* 367 * Find a client by IP address and protocol version 368 * - returns NULL if no such client 369 */ 370 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 371 { 372 struct nfs_client *clp; 373 374 spin_lock(&nfs_client_lock); 375 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 376 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 377 378 /* Don't match clients that failed to initialise properly */ 379 if (!(clp->cl_cons_state == NFS_CS_READY || 380 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 381 continue; 382 383 /* Different NFS versions cannot share the same nfs_client */ 384 if (clp->rpc_ops->version != nfsversion) 385 continue; 386 387 /* Match only the IP address, not the port number */ 388 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 389 continue; 390 391 atomic_inc(&clp->cl_count); 392 spin_unlock(&nfs_client_lock); 393 return clp; 394 } 395 spin_unlock(&nfs_client_lock); 396 return NULL; 397 } 398 399 /* 400 * Find a client by IP address and protocol version 401 * - returns NULL if no such client 402 */ 403 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 404 { 405 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 406 u32 nfsvers = clp->rpc_ops->version; 407 408 spin_lock(&nfs_client_lock); 409 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 410 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 411 412 /* Don't match clients that failed to initialise properly */ 413 if (clp->cl_cons_state != NFS_CS_READY) 414 continue; 415 416 /* Different NFS versions cannot share the same nfs_client */ 417 if (clp->rpc_ops->version != nfsvers) 418 continue; 419 420 /* Match only the IP address, not the port number */ 421 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 422 continue; 423 424 atomic_inc(&clp->cl_count); 425 spin_unlock(&nfs_client_lock); 426 return clp; 427 } 428 spin_unlock(&nfs_client_lock); 429 return NULL; 430 } 431 432 /* 433 * Find an nfs_client on the list that matches the initialisation data 434 * that is supplied. 435 */ 436 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 437 { 438 struct nfs_client *clp; 439 const struct sockaddr *sap = data->addr; 440 441 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 442 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 443 /* Don't match clients that failed to initialise properly */ 444 if (clp->cl_cons_state < 0) 445 continue; 446 447 /* Different NFS versions cannot share the same nfs_client */ 448 if (clp->rpc_ops != data->rpc_ops) 449 continue; 450 451 if (clp->cl_proto != data->proto) 452 continue; 453 /* Match nfsv4 minorversion */ 454 if (clp->cl_minorversion != data->minorversion) 455 continue; 456 /* Match the full socket address */ 457 if (!nfs_sockaddr_cmp(sap, clap)) 458 continue; 459 460 atomic_inc(&clp->cl_count); 461 return clp; 462 } 463 return NULL; 464 } 465 466 /* 467 * Look up a client by IP address and protocol version 468 * - creates a new record if one doesn't yet exist 469 */ 470 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 471 { 472 struct nfs_client *clp, *new = NULL; 473 int error; 474 475 dprintk("--> nfs_get_client(%s,v%u)\n", 476 cl_init->hostname ?: "", cl_init->rpc_ops->version); 477 478 /* see if the client already exists */ 479 do { 480 spin_lock(&nfs_client_lock); 481 482 clp = nfs_match_client(cl_init); 483 if (clp) 484 goto found_client; 485 if (new) 486 goto install_client; 487 488 spin_unlock(&nfs_client_lock); 489 490 new = nfs_alloc_client(cl_init); 491 } while (!IS_ERR(new)); 492 493 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 494 return new; 495 496 /* install a new client and return with it unready */ 497 install_client: 498 clp = new; 499 list_add(&clp->cl_share_link, &nfs_client_list); 500 spin_unlock(&nfs_client_lock); 501 dprintk("--> nfs_get_client() = %p [new]\n", clp); 502 return clp; 503 504 /* found an existing client 505 * - make sure it's ready before returning 506 */ 507 found_client: 508 spin_unlock(&nfs_client_lock); 509 510 if (new) 511 nfs_free_client(new); 512 513 error = wait_event_killable(nfs_client_active_wq, 514 clp->cl_cons_state < NFS_CS_INITING); 515 if (error < 0) { 516 nfs_put_client(clp); 517 return ERR_PTR(-ERESTARTSYS); 518 } 519 520 if (clp->cl_cons_state < NFS_CS_READY) { 521 error = clp->cl_cons_state; 522 nfs_put_client(clp); 523 return ERR_PTR(error); 524 } 525 526 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 527 528 dprintk("--> nfs_get_client() = %p [share]\n", clp); 529 return clp; 530 } 531 532 /* 533 * Mark a server as ready or failed 534 */ 535 void nfs_mark_client_ready(struct nfs_client *clp, int state) 536 { 537 clp->cl_cons_state = state; 538 wake_up_all(&nfs_client_active_wq); 539 } 540 541 /* 542 * With sessions, the client is not marked ready until after a 543 * successful EXCHANGE_ID and CREATE_SESSION. 544 * 545 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 546 * other versions of NFS can be tried. 547 */ 548 int nfs4_check_client_ready(struct nfs_client *clp) 549 { 550 if (!nfs4_has_session(clp)) 551 return 0; 552 if (clp->cl_cons_state < NFS_CS_READY) 553 return -EPROTONOSUPPORT; 554 return 0; 555 } 556 557 /* 558 * Initialise the timeout values for a connection 559 */ 560 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 561 unsigned int timeo, unsigned int retrans) 562 { 563 to->to_initval = timeo * HZ / 10; 564 to->to_retries = retrans; 565 566 switch (proto) { 567 case XPRT_TRANSPORT_TCP: 568 case XPRT_TRANSPORT_RDMA: 569 if (to->to_retries == 0) 570 to->to_retries = NFS_DEF_TCP_RETRANS; 571 if (to->to_initval == 0) 572 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 573 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 574 to->to_initval = NFS_MAX_TCP_TIMEOUT; 575 to->to_increment = to->to_initval; 576 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 577 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 578 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 579 if (to->to_maxval < to->to_initval) 580 to->to_maxval = to->to_initval; 581 to->to_exponential = 0; 582 break; 583 case XPRT_TRANSPORT_UDP: 584 if (to->to_retries == 0) 585 to->to_retries = NFS_DEF_UDP_RETRANS; 586 if (!to->to_initval) 587 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 588 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 589 to->to_initval = NFS_MAX_UDP_TIMEOUT; 590 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 591 to->to_exponential = 1; 592 break; 593 default: 594 BUG(); 595 } 596 } 597 598 /* 599 * Create an RPC client handle 600 */ 601 static int nfs_create_rpc_client(struct nfs_client *clp, 602 const struct rpc_timeout *timeparms, 603 rpc_authflavor_t flavor, 604 int discrtry, int noresvport) 605 { 606 struct rpc_clnt *clnt = NULL; 607 struct rpc_create_args args = { 608 .net = &init_net, 609 .protocol = clp->cl_proto, 610 .address = (struct sockaddr *)&clp->cl_addr, 611 .addrsize = clp->cl_addrlen, 612 .timeout = timeparms, 613 .servername = clp->cl_hostname, 614 .program = &nfs_program, 615 .version = clp->rpc_ops->version, 616 .authflavor = flavor, 617 }; 618 619 if (discrtry) 620 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 621 if (noresvport) 622 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 623 624 if (!IS_ERR(clp->cl_rpcclient)) 625 return 0; 626 627 clnt = rpc_create(&args); 628 if (IS_ERR(clnt)) { 629 dprintk("%s: cannot create RPC client. Error = %ld\n", 630 __func__, PTR_ERR(clnt)); 631 return PTR_ERR(clnt); 632 } 633 634 clp->cl_rpcclient = clnt; 635 return 0; 636 } 637 638 /* 639 * Version 2 or 3 client destruction 640 */ 641 static void nfs_destroy_server(struct nfs_server *server) 642 { 643 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 644 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 645 nlmclnt_done(server->nlm_host); 646 } 647 648 /* 649 * Version 2 or 3 lockd setup 650 */ 651 static int nfs_start_lockd(struct nfs_server *server) 652 { 653 struct nlm_host *host; 654 struct nfs_client *clp = server->nfs_client; 655 struct nlmclnt_initdata nlm_init = { 656 .hostname = clp->cl_hostname, 657 .address = (struct sockaddr *)&clp->cl_addr, 658 .addrlen = clp->cl_addrlen, 659 .nfs_version = clp->rpc_ops->version, 660 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 661 1 : 0, 662 }; 663 664 if (nlm_init.nfs_version > 3) 665 return 0; 666 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 667 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 668 return 0; 669 670 switch (clp->cl_proto) { 671 default: 672 nlm_init.protocol = IPPROTO_TCP; 673 break; 674 case XPRT_TRANSPORT_UDP: 675 nlm_init.protocol = IPPROTO_UDP; 676 } 677 678 host = nlmclnt_init(&nlm_init); 679 if (IS_ERR(host)) 680 return PTR_ERR(host); 681 682 server->nlm_host = host; 683 server->destroy = nfs_destroy_server; 684 return 0; 685 } 686 687 /* 688 * Initialise an NFSv3 ACL client connection 689 */ 690 #ifdef CONFIG_NFS_V3_ACL 691 static void nfs_init_server_aclclient(struct nfs_server *server) 692 { 693 if (server->nfs_client->rpc_ops->version != 3) 694 goto out_noacl; 695 if (server->flags & NFS_MOUNT_NOACL) 696 goto out_noacl; 697 698 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 699 if (IS_ERR(server->client_acl)) 700 goto out_noacl; 701 702 /* No errors! Assume that Sun nfsacls are supported */ 703 server->caps |= NFS_CAP_ACLS; 704 return; 705 706 out_noacl: 707 server->caps &= ~NFS_CAP_ACLS; 708 } 709 #else 710 static inline void nfs_init_server_aclclient(struct nfs_server *server) 711 { 712 server->flags &= ~NFS_MOUNT_NOACL; 713 server->caps &= ~NFS_CAP_ACLS; 714 } 715 #endif 716 717 /* 718 * Create a general RPC client 719 */ 720 static int nfs_init_server_rpcclient(struct nfs_server *server, 721 const struct rpc_timeout *timeo, 722 rpc_authflavor_t pseudoflavour) 723 { 724 struct nfs_client *clp = server->nfs_client; 725 726 server->client = rpc_clone_client(clp->cl_rpcclient); 727 if (IS_ERR(server->client)) { 728 dprintk("%s: couldn't create rpc_client!\n", __func__); 729 return PTR_ERR(server->client); 730 } 731 732 memcpy(&server->client->cl_timeout_default, 733 timeo, 734 sizeof(server->client->cl_timeout_default)); 735 server->client->cl_timeout = &server->client->cl_timeout_default; 736 737 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 738 struct rpc_auth *auth; 739 740 auth = rpcauth_create(pseudoflavour, server->client); 741 if (IS_ERR(auth)) { 742 dprintk("%s: couldn't create credcache!\n", __func__); 743 return PTR_ERR(auth); 744 } 745 } 746 server->client->cl_softrtry = 0; 747 if (server->flags & NFS_MOUNT_SOFT) 748 server->client->cl_softrtry = 1; 749 750 return 0; 751 } 752 753 /* 754 * Initialise an NFS2 or NFS3 client 755 */ 756 static int nfs_init_client(struct nfs_client *clp, 757 const struct rpc_timeout *timeparms, 758 const struct nfs_parsed_mount_data *data) 759 { 760 int error; 761 762 if (clp->cl_cons_state == NFS_CS_READY) { 763 /* the client is already initialised */ 764 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 765 return 0; 766 } 767 768 /* 769 * Create a client RPC handle for doing FSSTAT with UNIX auth only 770 * - RFC 2623, sec 2.3.2 771 */ 772 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 773 0, data->flags & NFS_MOUNT_NORESVPORT); 774 if (error < 0) 775 goto error; 776 nfs_mark_client_ready(clp, NFS_CS_READY); 777 return 0; 778 779 error: 780 nfs_mark_client_ready(clp, error); 781 dprintk("<-- nfs_init_client() = xerror %d\n", error); 782 return error; 783 } 784 785 /* 786 * Create a version 2 or 3 client 787 */ 788 static int nfs_init_server(struct nfs_server *server, 789 const struct nfs_parsed_mount_data *data) 790 { 791 struct nfs_client_initdata cl_init = { 792 .hostname = data->nfs_server.hostname, 793 .addr = (const struct sockaddr *)&data->nfs_server.address, 794 .addrlen = data->nfs_server.addrlen, 795 .rpc_ops = &nfs_v2_clientops, 796 .proto = data->nfs_server.protocol, 797 }; 798 struct rpc_timeout timeparms; 799 struct nfs_client *clp; 800 int error; 801 802 dprintk("--> nfs_init_server()\n"); 803 804 #ifdef CONFIG_NFS_V3 805 if (data->version == 3) 806 cl_init.rpc_ops = &nfs_v3_clientops; 807 #endif 808 809 /* Allocate or find a client reference we can use */ 810 clp = nfs_get_client(&cl_init); 811 if (IS_ERR(clp)) { 812 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 813 return PTR_ERR(clp); 814 } 815 816 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 817 data->timeo, data->retrans); 818 error = nfs_init_client(clp, &timeparms, data); 819 if (error < 0) 820 goto error; 821 822 server->nfs_client = clp; 823 824 /* Initialise the client representation from the mount data */ 825 server->flags = data->flags; 826 server->options = data->options; 827 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 828 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 829 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 830 831 if (data->rsize) 832 server->rsize = nfs_block_size(data->rsize, NULL); 833 if (data->wsize) 834 server->wsize = nfs_block_size(data->wsize, NULL); 835 836 server->acregmin = data->acregmin * HZ; 837 server->acregmax = data->acregmax * HZ; 838 server->acdirmin = data->acdirmin * HZ; 839 server->acdirmax = data->acdirmax * HZ; 840 841 /* Start lockd here, before we might error out */ 842 error = nfs_start_lockd(server); 843 if (error < 0) 844 goto error; 845 846 server->port = data->nfs_server.port; 847 848 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 849 if (error < 0) 850 goto error; 851 852 /* Preserve the values of mount_server-related mount options */ 853 if (data->mount_server.addrlen) { 854 memcpy(&server->mountd_address, &data->mount_server.address, 855 data->mount_server.addrlen); 856 server->mountd_addrlen = data->mount_server.addrlen; 857 } 858 server->mountd_version = data->mount_server.version; 859 server->mountd_port = data->mount_server.port; 860 server->mountd_protocol = data->mount_server.protocol; 861 862 server->namelen = data->namlen; 863 /* Create a client RPC handle for the NFSv3 ACL management interface */ 864 nfs_init_server_aclclient(server); 865 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 866 return 0; 867 868 error: 869 server->nfs_client = NULL; 870 nfs_put_client(clp); 871 dprintk("<-- nfs_init_server() = xerror %d\n", error); 872 return error; 873 } 874 875 /* 876 * Load up the server record from information gained in an fsinfo record 877 */ 878 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 879 { 880 unsigned long max_rpc_payload; 881 882 /* Work out a lot of parameters */ 883 if (server->rsize == 0) 884 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 885 if (server->wsize == 0) 886 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 887 888 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 889 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 890 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 891 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 892 893 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 894 if (server->rsize > max_rpc_payload) 895 server->rsize = max_rpc_payload; 896 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 897 server->rsize = NFS_MAX_FILE_IO_SIZE; 898 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 899 900 server->backing_dev_info.name = "nfs"; 901 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 902 903 if (server->wsize > max_rpc_payload) 904 server->wsize = max_rpc_payload; 905 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 906 server->wsize = NFS_MAX_FILE_IO_SIZE; 907 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 908 set_pnfs_layoutdriver(server, fsinfo->layouttype); 909 910 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 911 912 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 913 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 914 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 915 if (server->dtsize > server->rsize) 916 server->dtsize = server->rsize; 917 918 if (server->flags & NFS_MOUNT_NOAC) { 919 server->acregmin = server->acregmax = 0; 920 server->acdirmin = server->acdirmax = 0; 921 } 922 923 server->maxfilesize = fsinfo->maxfilesize; 924 925 server->time_delta = fsinfo->time_delta; 926 927 /* We're airborne Set socket buffersize */ 928 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 929 } 930 931 /* 932 * Probe filesystem information, including the FSID on v2/v3 933 */ 934 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 935 { 936 struct nfs_fsinfo fsinfo; 937 struct nfs_client *clp = server->nfs_client; 938 int error; 939 940 dprintk("--> nfs_probe_fsinfo()\n"); 941 942 if (clp->rpc_ops->set_capabilities != NULL) { 943 error = clp->rpc_ops->set_capabilities(server, mntfh); 944 if (error < 0) 945 goto out_error; 946 } 947 948 fsinfo.fattr = fattr; 949 fsinfo.layouttype = 0; 950 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 951 if (error < 0) 952 goto out_error; 953 954 nfs_server_set_fsinfo(server, &fsinfo); 955 956 /* Get some general file system info */ 957 if (server->namelen == 0) { 958 struct nfs_pathconf pathinfo; 959 960 pathinfo.fattr = fattr; 961 nfs_fattr_init(fattr); 962 963 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 964 server->namelen = pathinfo.max_namelen; 965 } 966 967 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 968 return 0; 969 970 out_error: 971 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 972 return error; 973 } 974 975 /* 976 * Copy useful information when duplicating a server record 977 */ 978 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 979 { 980 target->flags = source->flags; 981 target->rsize = source->rsize; 982 target->wsize = source->wsize; 983 target->acregmin = source->acregmin; 984 target->acregmax = source->acregmax; 985 target->acdirmin = source->acdirmin; 986 target->acdirmax = source->acdirmax; 987 target->caps = source->caps; 988 target->options = source->options; 989 } 990 991 /* 992 * Allocate and initialise a server record 993 */ 994 static struct nfs_server *nfs_alloc_server(void) 995 { 996 struct nfs_server *server; 997 998 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 999 if (!server) 1000 return NULL; 1001 1002 server->client = server->client_acl = ERR_PTR(-EINVAL); 1003 1004 /* Zero out the NFS state stuff */ 1005 INIT_LIST_HEAD(&server->client_link); 1006 INIT_LIST_HEAD(&server->master_link); 1007 1008 atomic_set(&server->active, 0); 1009 1010 server->io_stats = nfs_alloc_iostats(); 1011 if (!server->io_stats) { 1012 kfree(server); 1013 return NULL; 1014 } 1015 1016 if (bdi_init(&server->backing_dev_info)) { 1017 nfs_free_iostats(server->io_stats); 1018 kfree(server); 1019 return NULL; 1020 } 1021 1022 return server; 1023 } 1024 1025 /* 1026 * Free up a server record 1027 */ 1028 void nfs_free_server(struct nfs_server *server) 1029 { 1030 dprintk("--> nfs_free_server()\n"); 1031 1032 unset_pnfs_layoutdriver(server); 1033 spin_lock(&nfs_client_lock); 1034 list_del(&server->client_link); 1035 list_del(&server->master_link); 1036 spin_unlock(&nfs_client_lock); 1037 1038 if (server->destroy != NULL) 1039 server->destroy(server); 1040 1041 if (!IS_ERR(server->client_acl)) 1042 rpc_shutdown_client(server->client_acl); 1043 if (!IS_ERR(server->client)) 1044 rpc_shutdown_client(server->client); 1045 1046 nfs_put_client(server->nfs_client); 1047 1048 nfs_free_iostats(server->io_stats); 1049 bdi_destroy(&server->backing_dev_info); 1050 kfree(server); 1051 nfs_release_automount_timer(); 1052 dprintk("<-- nfs_free_server()\n"); 1053 } 1054 1055 /* 1056 * Create a version 2 or 3 volume record 1057 * - keyed on server and FSID 1058 */ 1059 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1060 struct nfs_fh *mntfh) 1061 { 1062 struct nfs_server *server; 1063 struct nfs_fattr *fattr; 1064 int error; 1065 1066 server = nfs_alloc_server(); 1067 if (!server) 1068 return ERR_PTR(-ENOMEM); 1069 1070 error = -ENOMEM; 1071 fattr = nfs_alloc_fattr(); 1072 if (fattr == NULL) 1073 goto error; 1074 1075 /* Get a client representation */ 1076 error = nfs_init_server(server, data); 1077 if (error < 0) 1078 goto error; 1079 1080 BUG_ON(!server->nfs_client); 1081 BUG_ON(!server->nfs_client->rpc_ops); 1082 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1083 1084 /* Probe the root fh to retrieve its FSID */ 1085 error = nfs_probe_fsinfo(server, mntfh, fattr); 1086 if (error < 0) 1087 goto error; 1088 if (server->nfs_client->rpc_ops->version == 3) { 1089 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1090 server->namelen = NFS3_MAXNAMLEN; 1091 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1092 server->caps |= NFS_CAP_READDIRPLUS; 1093 } else { 1094 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1095 server->namelen = NFS2_MAXNAMLEN; 1096 } 1097 1098 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1099 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1100 if (error < 0) { 1101 dprintk("nfs_create_server: getattr error = %d\n", -error); 1102 goto error; 1103 } 1104 } 1105 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1106 1107 dprintk("Server FSID: %llx:%llx\n", 1108 (unsigned long long) server->fsid.major, 1109 (unsigned long long) server->fsid.minor); 1110 1111 spin_lock(&nfs_client_lock); 1112 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1113 list_add_tail(&server->master_link, &nfs_volume_list); 1114 spin_unlock(&nfs_client_lock); 1115 1116 server->mount_time = jiffies; 1117 nfs_free_fattr(fattr); 1118 return server; 1119 1120 error: 1121 nfs_free_fattr(fattr); 1122 nfs_free_server(server); 1123 return ERR_PTR(error); 1124 } 1125 1126 #ifdef CONFIG_NFS_V4 1127 /* 1128 * Initialize the NFS4 callback service 1129 */ 1130 static int nfs4_init_callback(struct nfs_client *clp) 1131 { 1132 int error; 1133 1134 if (clp->rpc_ops->version == 4) { 1135 if (nfs4_has_session(clp)) { 1136 error = xprt_setup_backchannel( 1137 clp->cl_rpcclient->cl_xprt, 1138 NFS41_BC_MIN_CALLBACKS); 1139 if (error < 0) 1140 return error; 1141 } 1142 1143 error = nfs_callback_up(clp->cl_mvops->minor_version, 1144 clp->cl_rpcclient->cl_xprt); 1145 if (error < 0) { 1146 dprintk("%s: failed to start callback. Error = %d\n", 1147 __func__, error); 1148 return error; 1149 } 1150 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1151 } 1152 return 0; 1153 } 1154 1155 /* 1156 * Initialize the minor version specific parts of an NFS4 client record 1157 */ 1158 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1159 { 1160 #if defined(CONFIG_NFS_V4_1) 1161 if (clp->cl_mvops->minor_version) { 1162 struct nfs4_session *session = NULL; 1163 /* 1164 * Create the session and mark it expired. 1165 * When a SEQUENCE operation encounters the expired session 1166 * it will do session recovery to initialize it. 1167 */ 1168 session = nfs4_alloc_session(clp); 1169 if (!session) 1170 return -ENOMEM; 1171 1172 clp->cl_session = session; 1173 /* 1174 * The create session reply races with the server back 1175 * channel probe. Mark the client NFS_CS_SESSION_INITING 1176 * so that the client back channel can find the 1177 * nfs_client struct 1178 */ 1179 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1180 } 1181 #endif /* CONFIG_NFS_V4_1 */ 1182 1183 return nfs4_init_callback(clp); 1184 } 1185 1186 /* 1187 * Initialise an NFS4 client record 1188 */ 1189 static int nfs4_init_client(struct nfs_client *clp, 1190 const struct rpc_timeout *timeparms, 1191 const char *ip_addr, 1192 rpc_authflavor_t authflavour, 1193 int flags) 1194 { 1195 int error; 1196 1197 if (clp->cl_cons_state == NFS_CS_READY) { 1198 /* the client is initialised already */ 1199 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1200 return 0; 1201 } 1202 1203 /* Check NFS protocol revision and initialize RPC op vector */ 1204 clp->rpc_ops = &nfs_v4_clientops; 1205 1206 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1207 1, flags & NFS_MOUNT_NORESVPORT); 1208 if (error < 0) 1209 goto error; 1210 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1211 1212 error = nfs_idmap_new(clp); 1213 if (error < 0) { 1214 dprintk("%s: failed to create idmapper. Error = %d\n", 1215 __func__, error); 1216 goto error; 1217 } 1218 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1219 1220 error = nfs4_init_client_minor_version(clp); 1221 if (error < 0) 1222 goto error; 1223 1224 if (!nfs4_has_session(clp)) 1225 nfs_mark_client_ready(clp, NFS_CS_READY); 1226 return 0; 1227 1228 error: 1229 nfs_mark_client_ready(clp, error); 1230 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1231 return error; 1232 } 1233 1234 /* 1235 * Set up an NFS4 client 1236 */ 1237 static int nfs4_set_client(struct nfs_server *server, 1238 const char *hostname, 1239 const struct sockaddr *addr, 1240 const size_t addrlen, 1241 const char *ip_addr, 1242 rpc_authflavor_t authflavour, 1243 int proto, const struct rpc_timeout *timeparms, 1244 u32 minorversion) 1245 { 1246 struct nfs_client_initdata cl_init = { 1247 .hostname = hostname, 1248 .addr = addr, 1249 .addrlen = addrlen, 1250 .rpc_ops = &nfs_v4_clientops, 1251 .proto = proto, 1252 .minorversion = minorversion, 1253 }; 1254 struct nfs_client *clp; 1255 int error; 1256 1257 dprintk("--> nfs4_set_client()\n"); 1258 1259 /* Allocate or find a client reference we can use */ 1260 clp = nfs_get_client(&cl_init); 1261 if (IS_ERR(clp)) { 1262 error = PTR_ERR(clp); 1263 goto error; 1264 } 1265 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1266 server->flags); 1267 if (error < 0) 1268 goto error_put; 1269 1270 server->nfs_client = clp; 1271 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1272 return 0; 1273 1274 error_put: 1275 nfs_put_client(clp); 1276 error: 1277 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1278 return error; 1279 } 1280 1281 1282 /* 1283 * Session has been established, and the client marked ready. 1284 * Set the mount rsize and wsize with negotiated fore channel 1285 * attributes which will be bound checked in nfs_server_set_fsinfo. 1286 */ 1287 static void nfs4_session_set_rwsize(struct nfs_server *server) 1288 { 1289 #ifdef CONFIG_NFS_V4_1 1290 struct nfs4_session *sess; 1291 u32 server_resp_sz; 1292 u32 server_rqst_sz; 1293 1294 if (!nfs4_has_session(server->nfs_client)) 1295 return; 1296 sess = server->nfs_client->cl_session; 1297 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1298 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1299 1300 if (server->rsize > server_resp_sz) 1301 server->rsize = server_resp_sz; 1302 if (server->wsize > server_rqst_sz) 1303 server->wsize = server_rqst_sz; 1304 #endif /* CONFIG_NFS_V4_1 */ 1305 } 1306 1307 static int nfs4_server_common_setup(struct nfs_server *server, 1308 struct nfs_fh *mntfh) 1309 { 1310 struct nfs_fattr *fattr; 1311 int error; 1312 1313 BUG_ON(!server->nfs_client); 1314 BUG_ON(!server->nfs_client->rpc_ops); 1315 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1316 1317 fattr = nfs_alloc_fattr(); 1318 if (fattr == NULL) 1319 return -ENOMEM; 1320 1321 /* We must ensure the session is initialised first */ 1322 error = nfs4_init_session(server); 1323 if (error < 0) 1324 goto out; 1325 1326 /* Probe the root fh to retrieve its FSID and filehandle */ 1327 error = nfs4_get_rootfh(server, mntfh); 1328 if (error < 0) 1329 goto out; 1330 1331 dprintk("Server FSID: %llx:%llx\n", 1332 (unsigned long long) server->fsid.major, 1333 (unsigned long long) server->fsid.minor); 1334 dprintk("Mount FH: %d\n", mntfh->size); 1335 1336 nfs4_session_set_rwsize(server); 1337 1338 error = nfs_probe_fsinfo(server, mntfh, fattr); 1339 if (error < 0) 1340 goto out; 1341 1342 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1343 server->namelen = NFS4_MAXNAMLEN; 1344 1345 spin_lock(&nfs_client_lock); 1346 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1347 list_add_tail(&server->master_link, &nfs_volume_list); 1348 spin_unlock(&nfs_client_lock); 1349 1350 server->mount_time = jiffies; 1351 out: 1352 nfs_free_fattr(fattr); 1353 return error; 1354 } 1355 1356 /* 1357 * Create a version 4 volume record 1358 */ 1359 static int nfs4_init_server(struct nfs_server *server, 1360 const struct nfs_parsed_mount_data *data) 1361 { 1362 struct rpc_timeout timeparms; 1363 int error; 1364 1365 dprintk("--> nfs4_init_server()\n"); 1366 1367 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1368 data->timeo, data->retrans); 1369 1370 /* Initialise the client representation from the mount data */ 1371 server->flags = data->flags; 1372 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1373 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1374 server->caps |= NFS_CAP_READDIRPLUS; 1375 server->options = data->options; 1376 1377 /* Get a client record */ 1378 error = nfs4_set_client(server, 1379 data->nfs_server.hostname, 1380 (const struct sockaddr *)&data->nfs_server.address, 1381 data->nfs_server.addrlen, 1382 data->client_address, 1383 data->auth_flavors[0], 1384 data->nfs_server.protocol, 1385 &timeparms, 1386 data->minorversion); 1387 if (error < 0) 1388 goto error; 1389 1390 if (data->rsize) 1391 server->rsize = nfs_block_size(data->rsize, NULL); 1392 if (data->wsize) 1393 server->wsize = nfs_block_size(data->wsize, NULL); 1394 1395 server->acregmin = data->acregmin * HZ; 1396 server->acregmax = data->acregmax * HZ; 1397 server->acdirmin = data->acdirmin * HZ; 1398 server->acdirmax = data->acdirmax * HZ; 1399 1400 server->port = data->nfs_server.port; 1401 1402 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1403 1404 error: 1405 /* Done */ 1406 dprintk("<-- nfs4_init_server() = %d\n", error); 1407 return error; 1408 } 1409 1410 /* 1411 * Create a version 4 volume record 1412 * - keyed on server and FSID 1413 */ 1414 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1415 struct nfs_fh *mntfh) 1416 { 1417 struct nfs_server *server; 1418 int error; 1419 1420 dprintk("--> nfs4_create_server()\n"); 1421 1422 server = nfs_alloc_server(); 1423 if (!server) 1424 return ERR_PTR(-ENOMEM); 1425 1426 /* set up the general RPC client */ 1427 error = nfs4_init_server(server, data); 1428 if (error < 0) 1429 goto error; 1430 1431 error = nfs4_server_common_setup(server, mntfh); 1432 if (error < 0) 1433 goto error; 1434 1435 dprintk("<-- nfs4_create_server() = %p\n", server); 1436 return server; 1437 1438 error: 1439 nfs_free_server(server); 1440 dprintk("<-- nfs4_create_server() = error %d\n", error); 1441 return ERR_PTR(error); 1442 } 1443 1444 /* 1445 * Create an NFS4 referral server record 1446 */ 1447 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1448 struct nfs_fh *mntfh) 1449 { 1450 struct nfs_client *parent_client; 1451 struct nfs_server *server, *parent_server; 1452 int error; 1453 1454 dprintk("--> nfs4_create_referral_server()\n"); 1455 1456 server = nfs_alloc_server(); 1457 if (!server) 1458 return ERR_PTR(-ENOMEM); 1459 1460 parent_server = NFS_SB(data->sb); 1461 parent_client = parent_server->nfs_client; 1462 1463 /* Initialise the client representation from the parent server */ 1464 nfs_server_copy_userdata(server, parent_server); 1465 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1466 1467 /* Get a client representation. 1468 * Note: NFSv4 always uses TCP, */ 1469 error = nfs4_set_client(server, data->hostname, 1470 data->addr, 1471 data->addrlen, 1472 parent_client->cl_ipaddr, 1473 data->authflavor, 1474 parent_server->client->cl_xprt->prot, 1475 parent_server->client->cl_timeout, 1476 parent_client->cl_mvops->minor_version); 1477 if (error < 0) 1478 goto error; 1479 1480 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1481 if (error < 0) 1482 goto error; 1483 1484 error = nfs4_server_common_setup(server, mntfh); 1485 if (error < 0) 1486 goto error; 1487 1488 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1489 return server; 1490 1491 error: 1492 nfs_free_server(server); 1493 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1494 return ERR_PTR(error); 1495 } 1496 1497 #endif /* CONFIG_NFS_V4 */ 1498 1499 /* 1500 * Clone an NFS2, NFS3 or NFS4 server record 1501 */ 1502 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1503 struct nfs_fh *fh, 1504 struct nfs_fattr *fattr) 1505 { 1506 struct nfs_server *server; 1507 struct nfs_fattr *fattr_fsinfo; 1508 int error; 1509 1510 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1511 (unsigned long long) fattr->fsid.major, 1512 (unsigned long long) fattr->fsid.minor); 1513 1514 server = nfs_alloc_server(); 1515 if (!server) 1516 return ERR_PTR(-ENOMEM); 1517 1518 error = -ENOMEM; 1519 fattr_fsinfo = nfs_alloc_fattr(); 1520 if (fattr_fsinfo == NULL) 1521 goto out_free_server; 1522 1523 /* Copy data from the source */ 1524 server->nfs_client = source->nfs_client; 1525 atomic_inc(&server->nfs_client->cl_count); 1526 nfs_server_copy_userdata(server, source); 1527 1528 server->fsid = fattr->fsid; 1529 1530 error = nfs_init_server_rpcclient(server, 1531 source->client->cl_timeout, 1532 source->client->cl_auth->au_flavor); 1533 if (error < 0) 1534 goto out_free_server; 1535 if (!IS_ERR(source->client_acl)) 1536 nfs_init_server_aclclient(server); 1537 1538 /* probe the filesystem info for this server filesystem */ 1539 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1540 if (error < 0) 1541 goto out_free_server; 1542 1543 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1544 server->namelen = NFS4_MAXNAMLEN; 1545 1546 dprintk("Cloned FSID: %llx:%llx\n", 1547 (unsigned long long) server->fsid.major, 1548 (unsigned long long) server->fsid.minor); 1549 1550 error = nfs_start_lockd(server); 1551 if (error < 0) 1552 goto out_free_server; 1553 1554 spin_lock(&nfs_client_lock); 1555 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1556 list_add_tail(&server->master_link, &nfs_volume_list); 1557 spin_unlock(&nfs_client_lock); 1558 1559 server->mount_time = jiffies; 1560 1561 nfs_free_fattr(fattr_fsinfo); 1562 dprintk("<-- nfs_clone_server() = %p\n", server); 1563 return server; 1564 1565 out_free_server: 1566 nfs_free_fattr(fattr_fsinfo); 1567 nfs_free_server(server); 1568 dprintk("<-- nfs_clone_server() = error %d\n", error); 1569 return ERR_PTR(error); 1570 } 1571 1572 #ifdef CONFIG_PROC_FS 1573 static struct proc_dir_entry *proc_fs_nfs; 1574 1575 static int nfs_server_list_open(struct inode *inode, struct file *file); 1576 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1577 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1578 static void nfs_server_list_stop(struct seq_file *p, void *v); 1579 static int nfs_server_list_show(struct seq_file *m, void *v); 1580 1581 static const struct seq_operations nfs_server_list_ops = { 1582 .start = nfs_server_list_start, 1583 .next = nfs_server_list_next, 1584 .stop = nfs_server_list_stop, 1585 .show = nfs_server_list_show, 1586 }; 1587 1588 static const struct file_operations nfs_server_list_fops = { 1589 .open = nfs_server_list_open, 1590 .read = seq_read, 1591 .llseek = seq_lseek, 1592 .release = seq_release, 1593 .owner = THIS_MODULE, 1594 }; 1595 1596 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1597 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1598 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1599 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1600 static int nfs_volume_list_show(struct seq_file *m, void *v); 1601 1602 static const struct seq_operations nfs_volume_list_ops = { 1603 .start = nfs_volume_list_start, 1604 .next = nfs_volume_list_next, 1605 .stop = nfs_volume_list_stop, 1606 .show = nfs_volume_list_show, 1607 }; 1608 1609 static const struct file_operations nfs_volume_list_fops = { 1610 .open = nfs_volume_list_open, 1611 .read = seq_read, 1612 .llseek = seq_lseek, 1613 .release = seq_release, 1614 .owner = THIS_MODULE, 1615 }; 1616 1617 /* 1618 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1619 * we're dealing 1620 */ 1621 static int nfs_server_list_open(struct inode *inode, struct file *file) 1622 { 1623 struct seq_file *m; 1624 int ret; 1625 1626 ret = seq_open(file, &nfs_server_list_ops); 1627 if (ret < 0) 1628 return ret; 1629 1630 m = file->private_data; 1631 m->private = PDE(inode)->data; 1632 1633 return 0; 1634 } 1635 1636 /* 1637 * set up the iterator to start reading from the server list and return the first item 1638 */ 1639 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1640 { 1641 /* lock the list against modification */ 1642 spin_lock(&nfs_client_lock); 1643 return seq_list_start_head(&nfs_client_list, *_pos); 1644 } 1645 1646 /* 1647 * move to next server 1648 */ 1649 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1650 { 1651 return seq_list_next(v, &nfs_client_list, pos); 1652 } 1653 1654 /* 1655 * clean up after reading from the transports list 1656 */ 1657 static void nfs_server_list_stop(struct seq_file *p, void *v) 1658 { 1659 spin_unlock(&nfs_client_lock); 1660 } 1661 1662 /* 1663 * display a header line followed by a load of call lines 1664 */ 1665 static int nfs_server_list_show(struct seq_file *m, void *v) 1666 { 1667 struct nfs_client *clp; 1668 1669 /* display header on line 1 */ 1670 if (v == &nfs_client_list) { 1671 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1672 return 0; 1673 } 1674 1675 /* display one transport per line on subsequent lines */ 1676 clp = list_entry(v, struct nfs_client, cl_share_link); 1677 1678 seq_printf(m, "v%u %s %s %3d %s\n", 1679 clp->rpc_ops->version, 1680 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1681 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1682 atomic_read(&clp->cl_count), 1683 clp->cl_hostname); 1684 1685 return 0; 1686 } 1687 1688 /* 1689 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1690 */ 1691 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1692 { 1693 struct seq_file *m; 1694 int ret; 1695 1696 ret = seq_open(file, &nfs_volume_list_ops); 1697 if (ret < 0) 1698 return ret; 1699 1700 m = file->private_data; 1701 m->private = PDE(inode)->data; 1702 1703 return 0; 1704 } 1705 1706 /* 1707 * set up the iterator to start reading from the volume list and return the first item 1708 */ 1709 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1710 { 1711 /* lock the list against modification */ 1712 spin_lock(&nfs_client_lock); 1713 return seq_list_start_head(&nfs_volume_list, *_pos); 1714 } 1715 1716 /* 1717 * move to next volume 1718 */ 1719 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1720 { 1721 return seq_list_next(v, &nfs_volume_list, pos); 1722 } 1723 1724 /* 1725 * clean up after reading from the transports list 1726 */ 1727 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1728 { 1729 spin_unlock(&nfs_client_lock); 1730 } 1731 1732 /* 1733 * display a header line followed by a load of call lines 1734 */ 1735 static int nfs_volume_list_show(struct seq_file *m, void *v) 1736 { 1737 struct nfs_server *server; 1738 struct nfs_client *clp; 1739 char dev[8], fsid[17]; 1740 1741 /* display header on line 1 */ 1742 if (v == &nfs_volume_list) { 1743 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1744 return 0; 1745 } 1746 /* display one transport per line on subsequent lines */ 1747 server = list_entry(v, struct nfs_server, master_link); 1748 clp = server->nfs_client; 1749 1750 snprintf(dev, 8, "%u:%u", 1751 MAJOR(server->s_dev), MINOR(server->s_dev)); 1752 1753 snprintf(fsid, 17, "%llx:%llx", 1754 (unsigned long long) server->fsid.major, 1755 (unsigned long long) server->fsid.minor); 1756 1757 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1758 clp->rpc_ops->version, 1759 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1760 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1761 dev, 1762 fsid, 1763 nfs_server_fscache_state(server)); 1764 1765 return 0; 1766 } 1767 1768 /* 1769 * initialise the /proc/fs/nfsfs/ directory 1770 */ 1771 int __init nfs_fs_proc_init(void) 1772 { 1773 struct proc_dir_entry *p; 1774 1775 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1776 if (!proc_fs_nfs) 1777 goto error_0; 1778 1779 /* a file of servers with which we're dealing */ 1780 p = proc_create("servers", S_IFREG|S_IRUGO, 1781 proc_fs_nfs, &nfs_server_list_fops); 1782 if (!p) 1783 goto error_1; 1784 1785 /* a file of volumes that we have mounted */ 1786 p = proc_create("volumes", S_IFREG|S_IRUGO, 1787 proc_fs_nfs, &nfs_volume_list_fops); 1788 if (!p) 1789 goto error_2; 1790 return 0; 1791 1792 error_2: 1793 remove_proc_entry("servers", proc_fs_nfs); 1794 error_1: 1795 remove_proc_entry("fs/nfsfs", NULL); 1796 error_0: 1797 return -ENOMEM; 1798 } 1799 1800 /* 1801 * clean up the /proc/fs/nfsfs/ directory 1802 */ 1803 void nfs_fs_proc_exit(void) 1804 { 1805 remove_proc_entry("volumes", proc_fs_nfs); 1806 remove_proc_entry("servers", proc_fs_nfs); 1807 remove_proc_entry("fs/nfsfs", NULL); 1808 } 1809 1810 #endif /* CONFIG_PROC_FS */ 1811