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 #endif 154 cred = rpc_lookup_machine_cred(); 155 if (!IS_ERR(cred)) 156 clp->cl_machine_cred = cred; 157 158 nfs_fscache_get_client_cookie(clp); 159 160 return clp; 161 162 error_cleanup: 163 kfree(clp); 164 error_0: 165 return ERR_PTR(err); 166 } 167 168 #ifdef CONFIG_NFS_V4 169 /* 170 * Clears/puts all minor version specific parts from an nfs_client struct 171 * reverting it to minorversion 0. 172 */ 173 static void nfs4_clear_client_minor_version(struct nfs_client *clp) 174 { 175 #ifdef CONFIG_NFS_V4_1 176 if (nfs4_has_session(clp)) { 177 nfs4_destroy_session(clp->cl_session); 178 clp->cl_session = NULL; 179 } 180 181 clp->cl_call_sync = _nfs4_call_sync; 182 #endif /* CONFIG_NFS_V4_1 */ 183 } 184 185 /* 186 * Destroy the NFS4 callback service 187 */ 188 static void nfs4_destroy_callback(struct nfs_client *clp) 189 { 190 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 191 nfs_callback_down(clp->cl_minorversion); 192 } 193 194 static void nfs4_shutdown_client(struct nfs_client *clp) 195 { 196 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 197 nfs4_kill_renewd(clp); 198 nfs4_clear_client_minor_version(clp); 199 nfs4_destroy_callback(clp); 200 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 201 nfs_idmap_delete(clp); 202 203 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 204 } 205 #else 206 static void nfs4_shutdown_client(struct nfs_client *clp) 207 { 208 } 209 #endif /* CONFIG_NFS_V4 */ 210 211 /* 212 * Destroy a shared client record 213 */ 214 static void nfs_free_client(struct nfs_client *clp) 215 { 216 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 217 218 nfs4_shutdown_client(clp); 219 220 nfs_fscache_release_client_cookie(clp); 221 222 /* -EIO all pending I/O */ 223 if (!IS_ERR(clp->cl_rpcclient)) 224 rpc_shutdown_client(clp->cl_rpcclient); 225 226 if (clp->cl_machine_cred != NULL) 227 put_rpccred(clp->cl_machine_cred); 228 229 kfree(clp->cl_hostname); 230 kfree(clp); 231 232 dprintk("<-- nfs_free_client()\n"); 233 } 234 235 /* 236 * Release a reference to a shared client record 237 */ 238 void nfs_put_client(struct nfs_client *clp) 239 { 240 if (!clp) 241 return; 242 243 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 244 245 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 246 list_del(&clp->cl_share_link); 247 spin_unlock(&nfs_client_lock); 248 249 BUG_ON(!list_empty(&clp->cl_superblocks)); 250 251 nfs_free_client(clp); 252 } 253 } 254 255 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 256 /* 257 * Test if two ip6 socket addresses refer to the same socket by 258 * comparing relevant fields. The padding bytes specifically, are not 259 * compared. sin6_flowinfo is not compared because it only affects QoS 260 * and sin6_scope_id is only compared if the address is "link local" 261 * because "link local" addresses need only be unique to a specific 262 * link. Conversely, ordinary unicast addresses might have different 263 * sin6_scope_id. 264 * 265 * The caller should ensure both socket addresses are AF_INET6. 266 */ 267 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 268 const struct sockaddr *sa2) 269 { 270 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 271 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 272 273 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 274 sin1->sin6_scope_id != sin2->sin6_scope_id) 275 return 0; 276 277 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); 278 } 279 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 280 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 281 const struct sockaddr *sa2) 282 { 283 return 0; 284 } 285 #endif 286 287 /* 288 * Test if two ip4 socket addresses refer to the same socket, by 289 * comparing relevant fields. The padding bytes specifically, are 290 * not compared. 291 * 292 * The caller should ensure both socket addresses are AF_INET. 293 */ 294 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 295 const struct sockaddr *sa2) 296 { 297 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 298 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 299 300 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 301 } 302 303 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 304 const struct sockaddr *sa2) 305 { 306 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 307 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 308 309 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 310 (sin1->sin6_port == sin2->sin6_port); 311 } 312 313 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 314 const struct sockaddr *sa2) 315 { 316 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 317 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 318 319 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 320 (sin1->sin_port == sin2->sin_port); 321 } 322 323 /* 324 * Test if two socket addresses represent the same actual socket, 325 * by comparing (only) relevant fields, excluding the port number. 326 */ 327 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 328 const struct sockaddr *sa2) 329 { 330 if (sa1->sa_family != sa2->sa_family) 331 return 0; 332 333 switch (sa1->sa_family) { 334 case AF_INET: 335 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 336 case AF_INET6: 337 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 338 } 339 return 0; 340 } 341 342 /* 343 * Test if two socket addresses represent the same actual socket, 344 * by comparing (only) relevant fields, including the port number. 345 */ 346 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 347 const struct sockaddr *sa2) 348 { 349 if (sa1->sa_family != sa2->sa_family) 350 return 0; 351 352 switch (sa1->sa_family) { 353 case AF_INET: 354 return nfs_sockaddr_cmp_ip4(sa1, sa2); 355 case AF_INET6: 356 return nfs_sockaddr_cmp_ip6(sa1, sa2); 357 } 358 return 0; 359 } 360 361 /* 362 * Find a client by IP address and protocol version 363 * - returns NULL if no such client 364 */ 365 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 366 { 367 struct nfs_client *clp; 368 369 spin_lock(&nfs_client_lock); 370 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 371 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 372 373 /* Don't match clients that failed to initialise properly */ 374 if (!(clp->cl_cons_state == NFS_CS_READY || 375 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 376 continue; 377 378 /* Different NFS versions cannot share the same nfs_client */ 379 if (clp->rpc_ops->version != nfsversion) 380 continue; 381 382 /* Match only the IP address, not the port number */ 383 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 384 continue; 385 386 atomic_inc(&clp->cl_count); 387 spin_unlock(&nfs_client_lock); 388 return clp; 389 } 390 spin_unlock(&nfs_client_lock); 391 return NULL; 392 } 393 394 /* 395 * Find a client by IP address and protocol version 396 * - returns NULL if no such client 397 */ 398 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 399 { 400 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 401 u32 nfsvers = clp->rpc_ops->version; 402 403 spin_lock(&nfs_client_lock); 404 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 405 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 406 407 /* Don't match clients that failed to initialise properly */ 408 if (clp->cl_cons_state != NFS_CS_READY) 409 continue; 410 411 /* Different NFS versions cannot share the same nfs_client */ 412 if (clp->rpc_ops->version != nfsvers) 413 continue; 414 415 /* Match only the IP address, not the port number */ 416 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 417 continue; 418 419 atomic_inc(&clp->cl_count); 420 spin_unlock(&nfs_client_lock); 421 return clp; 422 } 423 spin_unlock(&nfs_client_lock); 424 return NULL; 425 } 426 427 /* 428 * Find an nfs_client on the list that matches the initialisation data 429 * that is supplied. 430 */ 431 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 432 { 433 struct nfs_client *clp; 434 const struct sockaddr *sap = data->addr; 435 436 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 437 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 438 /* Don't match clients that failed to initialise properly */ 439 if (clp->cl_cons_state < 0) 440 continue; 441 442 /* Different NFS versions cannot share the same nfs_client */ 443 if (clp->rpc_ops != data->rpc_ops) 444 continue; 445 446 if (clp->cl_proto != data->proto) 447 continue; 448 /* Match nfsv4 minorversion */ 449 if (clp->cl_minorversion != data->minorversion) 450 continue; 451 /* Match the full socket address */ 452 if (!nfs_sockaddr_cmp(sap, clap)) 453 continue; 454 455 atomic_inc(&clp->cl_count); 456 return clp; 457 } 458 return NULL; 459 } 460 461 /* 462 * Look up a client by IP address and protocol version 463 * - creates a new record if one doesn't yet exist 464 */ 465 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 466 { 467 struct nfs_client *clp, *new = NULL; 468 int error; 469 470 dprintk("--> nfs_get_client(%s,v%u)\n", 471 cl_init->hostname ?: "", cl_init->rpc_ops->version); 472 473 /* see if the client already exists */ 474 do { 475 spin_lock(&nfs_client_lock); 476 477 clp = nfs_match_client(cl_init); 478 if (clp) 479 goto found_client; 480 if (new) 481 goto install_client; 482 483 spin_unlock(&nfs_client_lock); 484 485 new = nfs_alloc_client(cl_init); 486 } while (!IS_ERR(new)); 487 488 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 489 return new; 490 491 /* install a new client and return with it unready */ 492 install_client: 493 clp = new; 494 list_add(&clp->cl_share_link, &nfs_client_list); 495 spin_unlock(&nfs_client_lock); 496 dprintk("--> nfs_get_client() = %p [new]\n", clp); 497 return clp; 498 499 /* found an existing client 500 * - make sure it's ready before returning 501 */ 502 found_client: 503 spin_unlock(&nfs_client_lock); 504 505 if (new) 506 nfs_free_client(new); 507 508 error = wait_event_killable(nfs_client_active_wq, 509 clp->cl_cons_state < NFS_CS_INITING); 510 if (error < 0) { 511 nfs_put_client(clp); 512 return ERR_PTR(-ERESTARTSYS); 513 } 514 515 if (clp->cl_cons_state < NFS_CS_READY) { 516 error = clp->cl_cons_state; 517 nfs_put_client(clp); 518 return ERR_PTR(error); 519 } 520 521 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 522 523 dprintk("--> nfs_get_client() = %p [share]\n", clp); 524 return clp; 525 } 526 527 /* 528 * Mark a server as ready or failed 529 */ 530 void nfs_mark_client_ready(struct nfs_client *clp, int state) 531 { 532 clp->cl_cons_state = state; 533 wake_up_all(&nfs_client_active_wq); 534 } 535 536 /* 537 * With sessions, the client is not marked ready until after a 538 * successful EXCHANGE_ID and CREATE_SESSION. 539 * 540 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 541 * other versions of NFS can be tried. 542 */ 543 int nfs4_check_client_ready(struct nfs_client *clp) 544 { 545 if (!nfs4_has_session(clp)) 546 return 0; 547 if (clp->cl_cons_state < NFS_CS_READY) 548 return -EPROTONOSUPPORT; 549 return 0; 550 } 551 552 /* 553 * Initialise the timeout values for a connection 554 */ 555 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 556 unsigned int timeo, unsigned int retrans) 557 { 558 to->to_initval = timeo * HZ / 10; 559 to->to_retries = retrans; 560 561 switch (proto) { 562 case XPRT_TRANSPORT_TCP: 563 case XPRT_TRANSPORT_RDMA: 564 if (to->to_retries == 0) 565 to->to_retries = NFS_DEF_TCP_RETRANS; 566 if (to->to_initval == 0) 567 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 568 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 569 to->to_initval = NFS_MAX_TCP_TIMEOUT; 570 to->to_increment = to->to_initval; 571 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 572 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 573 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 574 if (to->to_maxval < to->to_initval) 575 to->to_maxval = to->to_initval; 576 to->to_exponential = 0; 577 break; 578 case XPRT_TRANSPORT_UDP: 579 if (to->to_retries == 0) 580 to->to_retries = NFS_DEF_UDP_RETRANS; 581 if (!to->to_initval) 582 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 583 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 584 to->to_initval = NFS_MAX_UDP_TIMEOUT; 585 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 586 to->to_exponential = 1; 587 break; 588 default: 589 BUG(); 590 } 591 } 592 593 /* 594 * Create an RPC client handle 595 */ 596 static int nfs_create_rpc_client(struct nfs_client *clp, 597 const struct rpc_timeout *timeparms, 598 rpc_authflavor_t flavor, 599 int discrtry, int noresvport) 600 { 601 struct rpc_clnt *clnt = NULL; 602 struct rpc_create_args args = { 603 .protocol = clp->cl_proto, 604 .address = (struct sockaddr *)&clp->cl_addr, 605 .addrsize = clp->cl_addrlen, 606 .timeout = timeparms, 607 .servername = clp->cl_hostname, 608 .program = &nfs_program, 609 .version = clp->rpc_ops->version, 610 .authflavor = flavor, 611 }; 612 613 if (discrtry) 614 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 615 if (noresvport) 616 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 617 618 if (!IS_ERR(clp->cl_rpcclient)) 619 return 0; 620 621 clnt = rpc_create(&args); 622 if (IS_ERR(clnt)) { 623 dprintk("%s: cannot create RPC client. Error = %ld\n", 624 __func__, PTR_ERR(clnt)); 625 return PTR_ERR(clnt); 626 } 627 628 clp->cl_rpcclient = clnt; 629 return 0; 630 } 631 632 /* 633 * Version 2 or 3 client destruction 634 */ 635 static void nfs_destroy_server(struct nfs_server *server) 636 { 637 if (!(server->flags & NFS_MOUNT_NONLM)) 638 nlmclnt_done(server->nlm_host); 639 } 640 641 /* 642 * Version 2 or 3 lockd setup 643 */ 644 static int nfs_start_lockd(struct nfs_server *server) 645 { 646 struct nlm_host *host; 647 struct nfs_client *clp = server->nfs_client; 648 struct nlmclnt_initdata nlm_init = { 649 .hostname = clp->cl_hostname, 650 .address = (struct sockaddr *)&clp->cl_addr, 651 .addrlen = clp->cl_addrlen, 652 .nfs_version = clp->rpc_ops->version, 653 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 654 1 : 0, 655 }; 656 657 if (nlm_init.nfs_version > 3) 658 return 0; 659 if (server->flags & NFS_MOUNT_NONLM) 660 return 0; 661 662 switch (clp->cl_proto) { 663 default: 664 nlm_init.protocol = IPPROTO_TCP; 665 break; 666 case XPRT_TRANSPORT_UDP: 667 nlm_init.protocol = IPPROTO_UDP; 668 } 669 670 host = nlmclnt_init(&nlm_init); 671 if (IS_ERR(host)) 672 return PTR_ERR(host); 673 674 server->nlm_host = host; 675 server->destroy = nfs_destroy_server; 676 return 0; 677 } 678 679 /* 680 * Initialise an NFSv3 ACL client connection 681 */ 682 #ifdef CONFIG_NFS_V3_ACL 683 static void nfs_init_server_aclclient(struct nfs_server *server) 684 { 685 if (server->nfs_client->rpc_ops->version != 3) 686 goto out_noacl; 687 if (server->flags & NFS_MOUNT_NOACL) 688 goto out_noacl; 689 690 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 691 if (IS_ERR(server->client_acl)) 692 goto out_noacl; 693 694 /* No errors! Assume that Sun nfsacls are supported */ 695 server->caps |= NFS_CAP_ACLS; 696 return; 697 698 out_noacl: 699 server->caps &= ~NFS_CAP_ACLS; 700 } 701 #else 702 static inline void nfs_init_server_aclclient(struct nfs_server *server) 703 { 704 server->flags &= ~NFS_MOUNT_NOACL; 705 server->caps &= ~NFS_CAP_ACLS; 706 } 707 #endif 708 709 /* 710 * Create a general RPC client 711 */ 712 static int nfs_init_server_rpcclient(struct nfs_server *server, 713 const struct rpc_timeout *timeo, 714 rpc_authflavor_t pseudoflavour) 715 { 716 struct nfs_client *clp = server->nfs_client; 717 718 server->client = rpc_clone_client(clp->cl_rpcclient); 719 if (IS_ERR(server->client)) { 720 dprintk("%s: couldn't create rpc_client!\n", __func__); 721 return PTR_ERR(server->client); 722 } 723 724 memcpy(&server->client->cl_timeout_default, 725 timeo, 726 sizeof(server->client->cl_timeout_default)); 727 server->client->cl_timeout = &server->client->cl_timeout_default; 728 729 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 730 struct rpc_auth *auth; 731 732 auth = rpcauth_create(pseudoflavour, server->client); 733 if (IS_ERR(auth)) { 734 dprintk("%s: couldn't create credcache!\n", __func__); 735 return PTR_ERR(auth); 736 } 737 } 738 server->client->cl_softrtry = 0; 739 if (server->flags & NFS_MOUNT_SOFT) 740 server->client->cl_softrtry = 1; 741 742 return 0; 743 } 744 745 /* 746 * Initialise an NFS2 or NFS3 client 747 */ 748 static int nfs_init_client(struct nfs_client *clp, 749 const struct rpc_timeout *timeparms, 750 const struct nfs_parsed_mount_data *data) 751 { 752 int error; 753 754 if (clp->cl_cons_state == NFS_CS_READY) { 755 /* the client is already initialised */ 756 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 757 return 0; 758 } 759 760 /* 761 * Create a client RPC handle for doing FSSTAT with UNIX auth only 762 * - RFC 2623, sec 2.3.2 763 */ 764 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 765 0, data->flags & NFS_MOUNT_NORESVPORT); 766 if (error < 0) 767 goto error; 768 nfs_mark_client_ready(clp, NFS_CS_READY); 769 return 0; 770 771 error: 772 nfs_mark_client_ready(clp, error); 773 dprintk("<-- nfs_init_client() = xerror %d\n", error); 774 return error; 775 } 776 777 /* 778 * Create a version 2 or 3 client 779 */ 780 static int nfs_init_server(struct nfs_server *server, 781 const struct nfs_parsed_mount_data *data) 782 { 783 struct nfs_client_initdata cl_init = { 784 .hostname = data->nfs_server.hostname, 785 .addr = (const struct sockaddr *)&data->nfs_server.address, 786 .addrlen = data->nfs_server.addrlen, 787 .rpc_ops = &nfs_v2_clientops, 788 .proto = data->nfs_server.protocol, 789 }; 790 struct rpc_timeout timeparms; 791 struct nfs_client *clp; 792 int error; 793 794 dprintk("--> nfs_init_server()\n"); 795 796 #ifdef CONFIG_NFS_V3 797 if (data->version == 3) 798 cl_init.rpc_ops = &nfs_v3_clientops; 799 #endif 800 801 /* Allocate or find a client reference we can use */ 802 clp = nfs_get_client(&cl_init); 803 if (IS_ERR(clp)) { 804 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 805 return PTR_ERR(clp); 806 } 807 808 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 809 data->timeo, data->retrans); 810 error = nfs_init_client(clp, &timeparms, data); 811 if (error < 0) 812 goto error; 813 814 server->nfs_client = clp; 815 816 /* Initialise the client representation from the mount data */ 817 server->flags = data->flags; 818 server->options = data->options; 819 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 820 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 821 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 822 823 if (data->rsize) 824 server->rsize = nfs_block_size(data->rsize, NULL); 825 if (data->wsize) 826 server->wsize = nfs_block_size(data->wsize, NULL); 827 828 server->acregmin = data->acregmin * HZ; 829 server->acregmax = data->acregmax * HZ; 830 server->acdirmin = data->acdirmin * HZ; 831 server->acdirmax = data->acdirmax * HZ; 832 833 /* Start lockd here, before we might error out */ 834 error = nfs_start_lockd(server); 835 if (error < 0) 836 goto error; 837 838 server->port = data->nfs_server.port; 839 840 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 841 if (error < 0) 842 goto error; 843 844 /* Preserve the values of mount_server-related mount options */ 845 if (data->mount_server.addrlen) { 846 memcpy(&server->mountd_address, &data->mount_server.address, 847 data->mount_server.addrlen); 848 server->mountd_addrlen = data->mount_server.addrlen; 849 } 850 server->mountd_version = data->mount_server.version; 851 server->mountd_port = data->mount_server.port; 852 server->mountd_protocol = data->mount_server.protocol; 853 854 server->namelen = data->namlen; 855 /* Create a client RPC handle for the NFSv3 ACL management interface */ 856 nfs_init_server_aclclient(server); 857 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 858 return 0; 859 860 error: 861 server->nfs_client = NULL; 862 nfs_put_client(clp); 863 dprintk("<-- nfs_init_server() = xerror %d\n", error); 864 return error; 865 } 866 867 /* 868 * Load up the server record from information gained in an fsinfo record 869 */ 870 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 871 { 872 unsigned long max_rpc_payload; 873 874 /* Work out a lot of parameters */ 875 if (server->rsize == 0) 876 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 877 if (server->wsize == 0) 878 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 879 880 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 881 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 882 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 883 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 884 885 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 886 if (server->rsize > max_rpc_payload) 887 server->rsize = max_rpc_payload; 888 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 889 server->rsize = NFS_MAX_FILE_IO_SIZE; 890 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 891 892 server->backing_dev_info.name = "nfs"; 893 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 894 895 if (server->wsize > max_rpc_payload) 896 server->wsize = max_rpc_payload; 897 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 898 server->wsize = NFS_MAX_FILE_IO_SIZE; 899 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 900 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 901 902 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 903 if (server->dtsize > PAGE_CACHE_SIZE) 904 server->dtsize = PAGE_CACHE_SIZE; 905 if (server->dtsize > server->rsize) 906 server->dtsize = server->rsize; 907 908 if (server->flags & NFS_MOUNT_NOAC) { 909 server->acregmin = server->acregmax = 0; 910 server->acdirmin = server->acdirmax = 0; 911 } 912 913 server->maxfilesize = fsinfo->maxfilesize; 914 915 /* We're airborne Set socket buffersize */ 916 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 917 } 918 919 /* 920 * Probe filesystem information, including the FSID on v2/v3 921 */ 922 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 923 { 924 struct nfs_fsinfo fsinfo; 925 struct nfs_client *clp = server->nfs_client; 926 int error; 927 928 dprintk("--> nfs_probe_fsinfo()\n"); 929 930 if (clp->rpc_ops->set_capabilities != NULL) { 931 error = clp->rpc_ops->set_capabilities(server, mntfh); 932 if (error < 0) 933 goto out_error; 934 } 935 936 fsinfo.fattr = fattr; 937 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 938 if (error < 0) 939 goto out_error; 940 941 nfs_server_set_fsinfo(server, &fsinfo); 942 943 /* Get some general file system info */ 944 if (server->namelen == 0) { 945 struct nfs_pathconf pathinfo; 946 947 pathinfo.fattr = fattr; 948 nfs_fattr_init(fattr); 949 950 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 951 server->namelen = pathinfo.max_namelen; 952 } 953 954 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 955 return 0; 956 957 out_error: 958 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 959 return error; 960 } 961 962 /* 963 * Copy useful information when duplicating a server record 964 */ 965 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 966 { 967 target->flags = source->flags; 968 target->rsize = source->rsize; 969 target->wsize = source->wsize; 970 target->acregmin = source->acregmin; 971 target->acregmax = source->acregmax; 972 target->acdirmin = source->acdirmin; 973 target->acdirmax = source->acdirmax; 974 target->caps = source->caps; 975 target->options = source->options; 976 } 977 978 /* 979 * Allocate and initialise a server record 980 */ 981 static struct nfs_server *nfs_alloc_server(void) 982 { 983 struct nfs_server *server; 984 985 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 986 if (!server) 987 return NULL; 988 989 server->client = server->client_acl = ERR_PTR(-EINVAL); 990 991 /* Zero out the NFS state stuff */ 992 INIT_LIST_HEAD(&server->client_link); 993 INIT_LIST_HEAD(&server->master_link); 994 995 atomic_set(&server->active, 0); 996 997 server->io_stats = nfs_alloc_iostats(); 998 if (!server->io_stats) { 999 kfree(server); 1000 return NULL; 1001 } 1002 1003 if (bdi_init(&server->backing_dev_info)) { 1004 nfs_free_iostats(server->io_stats); 1005 kfree(server); 1006 return NULL; 1007 } 1008 1009 return server; 1010 } 1011 1012 /* 1013 * Free up a server record 1014 */ 1015 void nfs_free_server(struct nfs_server *server) 1016 { 1017 dprintk("--> nfs_free_server()\n"); 1018 1019 spin_lock(&nfs_client_lock); 1020 list_del(&server->client_link); 1021 list_del(&server->master_link); 1022 spin_unlock(&nfs_client_lock); 1023 1024 if (server->destroy != NULL) 1025 server->destroy(server); 1026 1027 if (!IS_ERR(server->client_acl)) 1028 rpc_shutdown_client(server->client_acl); 1029 if (!IS_ERR(server->client)) 1030 rpc_shutdown_client(server->client); 1031 1032 nfs_put_client(server->nfs_client); 1033 1034 nfs_free_iostats(server->io_stats); 1035 bdi_destroy(&server->backing_dev_info); 1036 kfree(server); 1037 nfs_release_automount_timer(); 1038 dprintk("<-- nfs_free_server()\n"); 1039 } 1040 1041 /* 1042 * Create a version 2 or 3 volume record 1043 * - keyed on server and FSID 1044 */ 1045 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1046 struct nfs_fh *mntfh) 1047 { 1048 struct nfs_server *server; 1049 struct nfs_fattr *fattr; 1050 int error; 1051 1052 server = nfs_alloc_server(); 1053 if (!server) 1054 return ERR_PTR(-ENOMEM); 1055 1056 error = -ENOMEM; 1057 fattr = nfs_alloc_fattr(); 1058 if (fattr == NULL) 1059 goto error; 1060 1061 /* Get a client representation */ 1062 error = nfs_init_server(server, data); 1063 if (error < 0) 1064 goto error; 1065 1066 BUG_ON(!server->nfs_client); 1067 BUG_ON(!server->nfs_client->rpc_ops); 1068 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1069 1070 /* Probe the root fh to retrieve its FSID */ 1071 error = nfs_probe_fsinfo(server, mntfh, fattr); 1072 if (error < 0) 1073 goto error; 1074 if (server->nfs_client->rpc_ops->version == 3) { 1075 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1076 server->namelen = NFS3_MAXNAMLEN; 1077 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1078 server->caps |= NFS_CAP_READDIRPLUS; 1079 } else { 1080 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1081 server->namelen = NFS2_MAXNAMLEN; 1082 } 1083 1084 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1085 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1086 if (error < 0) { 1087 dprintk("nfs_create_server: getattr error = %d\n", -error); 1088 goto error; 1089 } 1090 } 1091 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1092 1093 dprintk("Server FSID: %llx:%llx\n", 1094 (unsigned long long) server->fsid.major, 1095 (unsigned long long) server->fsid.minor); 1096 1097 spin_lock(&nfs_client_lock); 1098 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1099 list_add_tail(&server->master_link, &nfs_volume_list); 1100 spin_unlock(&nfs_client_lock); 1101 1102 server->mount_time = jiffies; 1103 nfs_free_fattr(fattr); 1104 return server; 1105 1106 error: 1107 nfs_free_fattr(fattr); 1108 nfs_free_server(server); 1109 return ERR_PTR(error); 1110 } 1111 1112 #ifdef CONFIG_NFS_V4 1113 /* 1114 * Initialize the NFS4 callback service 1115 */ 1116 static int nfs4_init_callback(struct nfs_client *clp) 1117 { 1118 int error; 1119 1120 if (clp->rpc_ops->version == 4) { 1121 if (nfs4_has_session(clp)) { 1122 error = xprt_setup_backchannel( 1123 clp->cl_rpcclient->cl_xprt, 1124 NFS41_BC_MIN_CALLBACKS); 1125 if (error < 0) 1126 return error; 1127 } 1128 1129 error = nfs_callback_up(clp->cl_minorversion, 1130 clp->cl_rpcclient->cl_xprt); 1131 if (error < 0) { 1132 dprintk("%s: failed to start callback. Error = %d\n", 1133 __func__, error); 1134 return error; 1135 } 1136 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1137 } 1138 return 0; 1139 } 1140 1141 /* 1142 * Initialize the minor version specific parts of an NFS4 client record 1143 */ 1144 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1145 { 1146 clp->cl_call_sync = _nfs4_call_sync; 1147 1148 #if defined(CONFIG_NFS_V4_1) 1149 if (clp->cl_minorversion) { 1150 struct nfs4_session *session = NULL; 1151 /* 1152 * Create the session and mark it expired. 1153 * When a SEQUENCE operation encounters the expired session 1154 * it will do session recovery to initialize it. 1155 */ 1156 session = nfs4_alloc_session(clp); 1157 if (!session) 1158 return -ENOMEM; 1159 1160 clp->cl_session = session; 1161 clp->cl_call_sync = _nfs4_call_sync_session; 1162 } 1163 #endif /* CONFIG_NFS_V4_1 */ 1164 1165 return nfs4_init_callback(clp); 1166 } 1167 1168 /* 1169 * Initialise an NFS4 client record 1170 */ 1171 static int nfs4_init_client(struct nfs_client *clp, 1172 const struct rpc_timeout *timeparms, 1173 const char *ip_addr, 1174 rpc_authflavor_t authflavour, 1175 int flags) 1176 { 1177 int error; 1178 1179 if (clp->cl_cons_state == NFS_CS_READY) { 1180 /* the client is initialised already */ 1181 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1182 return 0; 1183 } 1184 1185 /* Check NFS protocol revision and initialize RPC op vector */ 1186 clp->rpc_ops = &nfs_v4_clientops; 1187 1188 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1189 1, flags & NFS_MOUNT_NORESVPORT); 1190 if (error < 0) 1191 goto error; 1192 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1193 1194 error = nfs_idmap_new(clp); 1195 if (error < 0) { 1196 dprintk("%s: failed to create idmapper. Error = %d\n", 1197 __func__, error); 1198 goto error; 1199 } 1200 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1201 1202 error = nfs4_init_client_minor_version(clp); 1203 if (error < 0) 1204 goto error; 1205 1206 if (!nfs4_has_session(clp)) 1207 nfs_mark_client_ready(clp, NFS_CS_READY); 1208 return 0; 1209 1210 error: 1211 nfs_mark_client_ready(clp, error); 1212 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1213 return error; 1214 } 1215 1216 /* 1217 * Set up an NFS4 client 1218 */ 1219 static int nfs4_set_client(struct nfs_server *server, 1220 const char *hostname, 1221 const struct sockaddr *addr, 1222 const size_t addrlen, 1223 const char *ip_addr, 1224 rpc_authflavor_t authflavour, 1225 int proto, const struct rpc_timeout *timeparms, 1226 u32 minorversion) 1227 { 1228 struct nfs_client_initdata cl_init = { 1229 .hostname = hostname, 1230 .addr = addr, 1231 .addrlen = addrlen, 1232 .rpc_ops = &nfs_v4_clientops, 1233 .proto = proto, 1234 .minorversion = minorversion, 1235 }; 1236 struct nfs_client *clp; 1237 int error; 1238 1239 dprintk("--> nfs4_set_client()\n"); 1240 1241 /* Allocate or find a client reference we can use */ 1242 clp = nfs_get_client(&cl_init); 1243 if (IS_ERR(clp)) { 1244 error = PTR_ERR(clp); 1245 goto error; 1246 } 1247 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1248 server->flags); 1249 if (error < 0) 1250 goto error_put; 1251 1252 server->nfs_client = clp; 1253 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1254 return 0; 1255 1256 error_put: 1257 nfs_put_client(clp); 1258 error: 1259 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1260 return error; 1261 } 1262 1263 1264 /* 1265 * Session has been established, and the client marked ready. 1266 * Set the mount rsize and wsize with negotiated fore channel 1267 * attributes which will be bound checked in nfs_server_set_fsinfo. 1268 */ 1269 static void nfs4_session_set_rwsize(struct nfs_server *server) 1270 { 1271 #ifdef CONFIG_NFS_V4_1 1272 struct nfs4_session *sess; 1273 u32 server_resp_sz; 1274 u32 server_rqst_sz; 1275 1276 if (!nfs4_has_session(server->nfs_client)) 1277 return; 1278 sess = server->nfs_client->cl_session; 1279 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1280 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1281 1282 if (server->rsize > server_resp_sz) 1283 server->rsize = server_resp_sz; 1284 if (server->wsize > server_rqst_sz) 1285 server->wsize = server_rqst_sz; 1286 #endif /* CONFIG_NFS_V4_1 */ 1287 } 1288 1289 /* 1290 * Create a version 4 volume record 1291 */ 1292 static int nfs4_init_server(struct nfs_server *server, 1293 const struct nfs_parsed_mount_data *data) 1294 { 1295 struct rpc_timeout timeparms; 1296 int error; 1297 1298 dprintk("--> nfs4_init_server()\n"); 1299 1300 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1301 data->timeo, data->retrans); 1302 1303 /* Initialise the client representation from the mount data */ 1304 server->flags = data->flags; 1305 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR| 1306 NFS_CAP_POSIX_LOCK; 1307 server->options = data->options; 1308 1309 /* Get a client record */ 1310 error = nfs4_set_client(server, 1311 data->nfs_server.hostname, 1312 (const struct sockaddr *)&data->nfs_server.address, 1313 data->nfs_server.addrlen, 1314 data->client_address, 1315 data->auth_flavors[0], 1316 data->nfs_server.protocol, 1317 &timeparms, 1318 data->minorversion); 1319 if (error < 0) 1320 goto error; 1321 1322 if (data->rsize) 1323 server->rsize = nfs_block_size(data->rsize, NULL); 1324 if (data->wsize) 1325 server->wsize = nfs_block_size(data->wsize, NULL); 1326 1327 server->acregmin = data->acregmin * HZ; 1328 server->acregmax = data->acregmax * HZ; 1329 server->acdirmin = data->acdirmin * HZ; 1330 server->acdirmax = data->acdirmax * HZ; 1331 1332 server->port = data->nfs_server.port; 1333 1334 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1335 1336 error: 1337 /* Done */ 1338 dprintk("<-- nfs4_init_server() = %d\n", error); 1339 return error; 1340 } 1341 1342 /* 1343 * Create a version 4 volume record 1344 * - keyed on server and FSID 1345 */ 1346 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1347 struct nfs_fh *mntfh) 1348 { 1349 struct nfs_fattr *fattr; 1350 struct nfs_server *server; 1351 int error; 1352 1353 dprintk("--> nfs4_create_server()\n"); 1354 1355 server = nfs_alloc_server(); 1356 if (!server) 1357 return ERR_PTR(-ENOMEM); 1358 1359 error = -ENOMEM; 1360 fattr = nfs_alloc_fattr(); 1361 if (fattr == NULL) 1362 goto error; 1363 1364 /* set up the general RPC client */ 1365 error = nfs4_init_server(server, data); 1366 if (error < 0) 1367 goto error; 1368 1369 BUG_ON(!server->nfs_client); 1370 BUG_ON(!server->nfs_client->rpc_ops); 1371 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1372 1373 error = nfs4_init_session(server); 1374 if (error < 0) 1375 goto error; 1376 1377 /* Probe the root fh to retrieve its FSID */ 1378 error = nfs4_get_rootfh(server, mntfh); 1379 if (error < 0) 1380 goto error; 1381 1382 dprintk("Server FSID: %llx:%llx\n", 1383 (unsigned long long) server->fsid.major, 1384 (unsigned long long) server->fsid.minor); 1385 dprintk("Mount FH: %d\n", mntfh->size); 1386 1387 nfs4_session_set_rwsize(server); 1388 1389 error = nfs_probe_fsinfo(server, mntfh, fattr); 1390 if (error < 0) 1391 goto error; 1392 1393 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1394 server->namelen = NFS4_MAXNAMLEN; 1395 1396 spin_lock(&nfs_client_lock); 1397 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1398 list_add_tail(&server->master_link, &nfs_volume_list); 1399 spin_unlock(&nfs_client_lock); 1400 1401 server->mount_time = jiffies; 1402 dprintk("<-- nfs4_create_server() = %p\n", server); 1403 nfs_free_fattr(fattr); 1404 return server; 1405 1406 error: 1407 nfs_free_fattr(fattr); 1408 nfs_free_server(server); 1409 dprintk("<-- nfs4_create_server() = error %d\n", error); 1410 return ERR_PTR(error); 1411 } 1412 1413 /* 1414 * Create an NFS4 referral server record 1415 */ 1416 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1417 struct nfs_fh *mntfh) 1418 { 1419 struct nfs_client *parent_client; 1420 struct nfs_server *server, *parent_server; 1421 struct nfs_fattr *fattr; 1422 int error; 1423 1424 dprintk("--> nfs4_create_referral_server()\n"); 1425 1426 server = nfs_alloc_server(); 1427 if (!server) 1428 return ERR_PTR(-ENOMEM); 1429 1430 error = -ENOMEM; 1431 fattr = nfs_alloc_fattr(); 1432 if (fattr == NULL) 1433 goto error; 1434 1435 parent_server = NFS_SB(data->sb); 1436 parent_client = parent_server->nfs_client; 1437 1438 /* Initialise the client representation from the parent server */ 1439 nfs_server_copy_userdata(server, parent_server); 1440 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1441 1442 /* Get a client representation. 1443 * Note: NFSv4 always uses TCP, */ 1444 error = nfs4_set_client(server, data->hostname, 1445 data->addr, 1446 data->addrlen, 1447 parent_client->cl_ipaddr, 1448 data->authflavor, 1449 parent_server->client->cl_xprt->prot, 1450 parent_server->client->cl_timeout, 1451 parent_client->cl_minorversion); 1452 if (error < 0) 1453 goto error; 1454 1455 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1456 if (error < 0) 1457 goto error; 1458 1459 BUG_ON(!server->nfs_client); 1460 BUG_ON(!server->nfs_client->rpc_ops); 1461 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1462 1463 /* Probe the root fh to retrieve its FSID and filehandle */ 1464 error = nfs4_get_rootfh(server, mntfh); 1465 if (error < 0) 1466 goto error; 1467 1468 /* probe the filesystem info for this server filesystem */ 1469 error = nfs_probe_fsinfo(server, mntfh, fattr); 1470 if (error < 0) 1471 goto error; 1472 1473 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1474 server->namelen = NFS4_MAXNAMLEN; 1475 1476 dprintk("Referral FSID: %llx:%llx\n", 1477 (unsigned long long) server->fsid.major, 1478 (unsigned long long) server->fsid.minor); 1479 1480 spin_lock(&nfs_client_lock); 1481 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1482 list_add_tail(&server->master_link, &nfs_volume_list); 1483 spin_unlock(&nfs_client_lock); 1484 1485 server->mount_time = jiffies; 1486 1487 nfs_free_fattr(fattr); 1488 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1489 return server; 1490 1491 error: 1492 nfs_free_fattr(fattr); 1493 nfs_free_server(server); 1494 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1495 return ERR_PTR(error); 1496 } 1497 1498 #endif /* CONFIG_NFS_V4 */ 1499 1500 /* 1501 * Clone an NFS2, NFS3 or NFS4 server record 1502 */ 1503 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1504 struct nfs_fh *fh, 1505 struct nfs_fattr *fattr) 1506 { 1507 struct nfs_server *server; 1508 struct nfs_fattr *fattr_fsinfo; 1509 int error; 1510 1511 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1512 (unsigned long long) fattr->fsid.major, 1513 (unsigned long long) fattr->fsid.minor); 1514 1515 server = nfs_alloc_server(); 1516 if (!server) 1517 return ERR_PTR(-ENOMEM); 1518 1519 error = -ENOMEM; 1520 fattr_fsinfo = nfs_alloc_fattr(); 1521 if (fattr_fsinfo == NULL) 1522 goto out_free_server; 1523 1524 /* Copy data from the source */ 1525 server->nfs_client = source->nfs_client; 1526 atomic_inc(&server->nfs_client->cl_count); 1527 nfs_server_copy_userdata(server, source); 1528 1529 server->fsid = fattr->fsid; 1530 1531 error = nfs_init_server_rpcclient(server, 1532 source->client->cl_timeout, 1533 source->client->cl_auth->au_flavor); 1534 if (error < 0) 1535 goto out_free_server; 1536 if (!IS_ERR(source->client_acl)) 1537 nfs_init_server_aclclient(server); 1538 1539 /* probe the filesystem info for this server filesystem */ 1540 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1541 if (error < 0) 1542 goto out_free_server; 1543 1544 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1545 server->namelen = NFS4_MAXNAMLEN; 1546 1547 dprintk("Cloned FSID: %llx:%llx\n", 1548 (unsigned long long) server->fsid.major, 1549 (unsigned long long) server->fsid.minor); 1550 1551 error = nfs_start_lockd(server); 1552 if (error < 0) 1553 goto out_free_server; 1554 1555 spin_lock(&nfs_client_lock); 1556 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1557 list_add_tail(&server->master_link, &nfs_volume_list); 1558 spin_unlock(&nfs_client_lock); 1559 1560 server->mount_time = jiffies; 1561 1562 nfs_free_fattr(fattr_fsinfo); 1563 dprintk("<-- nfs_clone_server() = %p\n", server); 1564 return server; 1565 1566 out_free_server: 1567 nfs_free_fattr(fattr_fsinfo); 1568 nfs_free_server(server); 1569 dprintk("<-- nfs_clone_server() = error %d\n", error); 1570 return ERR_PTR(error); 1571 } 1572 1573 #ifdef CONFIG_PROC_FS 1574 static struct proc_dir_entry *proc_fs_nfs; 1575 1576 static int nfs_server_list_open(struct inode *inode, struct file *file); 1577 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1578 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1579 static void nfs_server_list_stop(struct seq_file *p, void *v); 1580 static int nfs_server_list_show(struct seq_file *m, void *v); 1581 1582 static const struct seq_operations nfs_server_list_ops = { 1583 .start = nfs_server_list_start, 1584 .next = nfs_server_list_next, 1585 .stop = nfs_server_list_stop, 1586 .show = nfs_server_list_show, 1587 }; 1588 1589 static const struct file_operations nfs_server_list_fops = { 1590 .open = nfs_server_list_open, 1591 .read = seq_read, 1592 .llseek = seq_lseek, 1593 .release = seq_release, 1594 .owner = THIS_MODULE, 1595 }; 1596 1597 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1598 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1599 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1600 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1601 static int nfs_volume_list_show(struct seq_file *m, void *v); 1602 1603 static const struct seq_operations nfs_volume_list_ops = { 1604 .start = nfs_volume_list_start, 1605 .next = nfs_volume_list_next, 1606 .stop = nfs_volume_list_stop, 1607 .show = nfs_volume_list_show, 1608 }; 1609 1610 static const struct file_operations nfs_volume_list_fops = { 1611 .open = nfs_volume_list_open, 1612 .read = seq_read, 1613 .llseek = seq_lseek, 1614 .release = seq_release, 1615 .owner = THIS_MODULE, 1616 }; 1617 1618 /* 1619 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1620 * we're dealing 1621 */ 1622 static int nfs_server_list_open(struct inode *inode, struct file *file) 1623 { 1624 struct seq_file *m; 1625 int ret; 1626 1627 ret = seq_open(file, &nfs_server_list_ops); 1628 if (ret < 0) 1629 return ret; 1630 1631 m = file->private_data; 1632 m->private = PDE(inode)->data; 1633 1634 return 0; 1635 } 1636 1637 /* 1638 * set up the iterator to start reading from the server list and return the first item 1639 */ 1640 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1641 { 1642 /* lock the list against modification */ 1643 spin_lock(&nfs_client_lock); 1644 return seq_list_start_head(&nfs_client_list, *_pos); 1645 } 1646 1647 /* 1648 * move to next server 1649 */ 1650 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1651 { 1652 return seq_list_next(v, &nfs_client_list, pos); 1653 } 1654 1655 /* 1656 * clean up after reading from the transports list 1657 */ 1658 static void nfs_server_list_stop(struct seq_file *p, void *v) 1659 { 1660 spin_unlock(&nfs_client_lock); 1661 } 1662 1663 /* 1664 * display a header line followed by a load of call lines 1665 */ 1666 static int nfs_server_list_show(struct seq_file *m, void *v) 1667 { 1668 struct nfs_client *clp; 1669 1670 /* display header on line 1 */ 1671 if (v == &nfs_client_list) { 1672 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1673 return 0; 1674 } 1675 1676 /* display one transport per line on subsequent lines */ 1677 clp = list_entry(v, struct nfs_client, cl_share_link); 1678 1679 seq_printf(m, "v%u %s %s %3d %s\n", 1680 clp->rpc_ops->version, 1681 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1682 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1683 atomic_read(&clp->cl_count), 1684 clp->cl_hostname); 1685 1686 return 0; 1687 } 1688 1689 /* 1690 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1691 */ 1692 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1693 { 1694 struct seq_file *m; 1695 int ret; 1696 1697 ret = seq_open(file, &nfs_volume_list_ops); 1698 if (ret < 0) 1699 return ret; 1700 1701 m = file->private_data; 1702 m->private = PDE(inode)->data; 1703 1704 return 0; 1705 } 1706 1707 /* 1708 * set up the iterator to start reading from the volume list and return the first item 1709 */ 1710 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1711 { 1712 /* lock the list against modification */ 1713 spin_lock(&nfs_client_lock); 1714 return seq_list_start_head(&nfs_volume_list, *_pos); 1715 } 1716 1717 /* 1718 * move to next volume 1719 */ 1720 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1721 { 1722 return seq_list_next(v, &nfs_volume_list, pos); 1723 } 1724 1725 /* 1726 * clean up after reading from the transports list 1727 */ 1728 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1729 { 1730 spin_unlock(&nfs_client_lock); 1731 } 1732 1733 /* 1734 * display a header line followed by a load of call lines 1735 */ 1736 static int nfs_volume_list_show(struct seq_file *m, void *v) 1737 { 1738 struct nfs_server *server; 1739 struct nfs_client *clp; 1740 char dev[8], fsid[17]; 1741 1742 /* display header on line 1 */ 1743 if (v == &nfs_volume_list) { 1744 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1745 return 0; 1746 } 1747 /* display one transport per line on subsequent lines */ 1748 server = list_entry(v, struct nfs_server, master_link); 1749 clp = server->nfs_client; 1750 1751 snprintf(dev, 8, "%u:%u", 1752 MAJOR(server->s_dev), MINOR(server->s_dev)); 1753 1754 snprintf(fsid, 17, "%llx:%llx", 1755 (unsigned long long) server->fsid.major, 1756 (unsigned long long) server->fsid.minor); 1757 1758 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1759 clp->rpc_ops->version, 1760 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1761 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1762 dev, 1763 fsid, 1764 nfs_server_fscache_state(server)); 1765 1766 return 0; 1767 } 1768 1769 /* 1770 * initialise the /proc/fs/nfsfs/ directory 1771 */ 1772 int __init nfs_fs_proc_init(void) 1773 { 1774 struct proc_dir_entry *p; 1775 1776 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1777 if (!proc_fs_nfs) 1778 goto error_0; 1779 1780 /* a file of servers with which we're dealing */ 1781 p = proc_create("servers", S_IFREG|S_IRUGO, 1782 proc_fs_nfs, &nfs_server_list_fops); 1783 if (!p) 1784 goto error_1; 1785 1786 /* a file of volumes that we have mounted */ 1787 p = proc_create("volumes", S_IFREG|S_IRUGO, 1788 proc_fs_nfs, &nfs_volume_list_fops); 1789 if (!p) 1790 goto error_2; 1791 return 0; 1792 1793 error_2: 1794 remove_proc_entry("servers", proc_fs_nfs); 1795 error_1: 1796 remove_proc_entry("fs/nfsfs", NULL); 1797 error_0: 1798 return -ENOMEM; 1799 } 1800 1801 /* 1802 * clean up the /proc/fs/nfsfs/ directory 1803 */ 1804 void nfs_fs_proc_exit(void) 1805 { 1806 remove_proc_entry("volumes", proc_fs_nfs); 1807 remove_proc_entry("servers", proc_fs_nfs); 1808 remove_proc_entry("fs/nfsfs", NULL); 1809 } 1810 1811 #endif /* CONFIG_PROC_FS */ 1812