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