1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <net/ipv6.h> 39 #include <linux/nfs_xdr.h> 40 #include <linux/sunrpc/bc_xprt.h> 41 42 #include <asm/system.h> 43 44 #include "nfs4_fs.h" 45 #include "callback.h" 46 #include "delegation.h" 47 #include "iostat.h" 48 #include "internal.h" 49 #include "fscache.h" 50 51 #define NFSDBG_FACILITY NFSDBG_CLIENT 52 53 static DEFINE_SPINLOCK(nfs_client_lock); 54 static LIST_HEAD(nfs_client_list); 55 static LIST_HEAD(nfs_volume_list); 56 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 57 58 /* 59 * RPC cruft for NFS 60 */ 61 static struct rpc_version *nfs_version[5] = { 62 [2] = &nfs_version2, 63 #ifdef CONFIG_NFS_V3 64 [3] = &nfs_version3, 65 #endif 66 #ifdef CONFIG_NFS_V4 67 [4] = &nfs_version4, 68 #endif 69 }; 70 71 struct rpc_program nfs_program = { 72 .name = "nfs", 73 .number = NFS_PROGRAM, 74 .nrvers = ARRAY_SIZE(nfs_version), 75 .version = nfs_version, 76 .stats = &nfs_rpcstat, 77 .pipe_dir_name = "/nfs", 78 }; 79 80 struct rpc_stat nfs_rpcstat = { 81 .program = &nfs_program 82 }; 83 84 85 #ifdef CONFIG_NFS_V3_ACL 86 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 87 static struct rpc_version * nfsacl_version[] = { 88 [3] = &nfsacl_version3, 89 }; 90 91 struct rpc_program nfsacl_program = { 92 .name = "nfsacl", 93 .number = NFS_ACL_PROGRAM, 94 .nrvers = ARRAY_SIZE(nfsacl_version), 95 .version = nfsacl_version, 96 .stats = &nfsacl_rpcstat, 97 }; 98 #endif /* CONFIG_NFS_V3_ACL */ 99 100 struct nfs_client_initdata { 101 const char *hostname; 102 const struct sockaddr *addr; 103 size_t addrlen; 104 const struct nfs_rpc_ops *rpc_ops; 105 int proto; 106 u32 minorversion; 107 }; 108 109 /* 110 * Allocate a shared client record 111 * 112 * Since these are allocated/deallocated very rarely, we don't 113 * bother putting them in a slab cache... 114 */ 115 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 116 { 117 struct nfs_client *clp; 118 struct rpc_cred *cred; 119 int err = -ENOMEM; 120 121 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 122 goto error_0; 123 124 clp->rpc_ops = cl_init->rpc_ops; 125 126 atomic_set(&clp->cl_count, 1); 127 clp->cl_cons_state = NFS_CS_INITING; 128 129 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 130 clp->cl_addrlen = cl_init->addrlen; 131 132 if (cl_init->hostname) { 133 err = -ENOMEM; 134 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 135 if (!clp->cl_hostname) 136 goto error_cleanup; 137 } 138 139 INIT_LIST_HEAD(&clp->cl_superblocks); 140 clp->cl_rpcclient = ERR_PTR(-EINVAL); 141 142 clp->cl_proto = cl_init->proto; 143 144 #ifdef CONFIG_NFS_V4 145 INIT_LIST_HEAD(&clp->cl_delegations); 146 spin_lock_init(&clp->cl_lock); 147 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 149 clp->cl_boot_time = CURRENT_TIME; 150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 151 clp->cl_minorversion = cl_init->minorversion; 152 #endif 153 cred = rpc_lookup_machine_cred(); 154 if (!IS_ERR(cred)) 155 clp->cl_machine_cred = cred; 156 157 nfs_fscache_get_client_cookie(clp); 158 159 return clp; 160 161 error_cleanup: 162 kfree(clp); 163 error_0: 164 return ERR_PTR(err); 165 } 166 167 static void nfs4_shutdown_client(struct nfs_client *clp) 168 { 169 #ifdef CONFIG_NFS_V4 170 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 171 nfs4_kill_renewd(clp); 172 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners)); 173 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 174 nfs_idmap_delete(clp); 175 176 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 177 #endif 178 } 179 180 /* 181 * Destroy the NFS4 callback service 182 */ 183 static void nfs4_destroy_callback(struct nfs_client *clp) 184 { 185 #ifdef CONFIG_NFS_V4 186 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 187 nfs_callback_down(clp->cl_minorversion); 188 #endif /* CONFIG_NFS_V4 */ 189 } 190 191 /* 192 * Clears/puts all minor version specific parts from an nfs_client struct 193 * reverting it to minorversion 0. 194 */ 195 static void nfs4_clear_client_minor_version(struct nfs_client *clp) 196 { 197 #ifdef CONFIG_NFS_V4_1 198 if (nfs4_has_session(clp)) { 199 nfs4_destroy_session(clp->cl_session); 200 clp->cl_session = NULL; 201 } 202 203 clp->cl_call_sync = _nfs4_call_sync; 204 #endif /* CONFIG_NFS_V4_1 */ 205 206 nfs4_destroy_callback(clp); 207 } 208 209 /* 210 * Destroy a shared client record 211 */ 212 static void nfs_free_client(struct nfs_client *clp) 213 { 214 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 215 216 nfs4_clear_client_minor_version(clp); 217 nfs4_shutdown_client(clp); 218 219 nfs_fscache_release_client_cookie(clp); 220 221 /* -EIO all pending I/O */ 222 if (!IS_ERR(clp->cl_rpcclient)) 223 rpc_shutdown_client(clp->cl_rpcclient); 224 225 if (clp->cl_machine_cred != NULL) 226 put_rpccred(clp->cl_machine_cred); 227 228 kfree(clp->cl_hostname); 229 kfree(clp); 230 231 dprintk("<-- nfs_free_client()\n"); 232 } 233 234 /* 235 * Release a reference to a shared client record 236 */ 237 void nfs_put_client(struct nfs_client *clp) 238 { 239 if (!clp) 240 return; 241 242 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 243 244 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 245 list_del(&clp->cl_share_link); 246 spin_unlock(&nfs_client_lock); 247 248 BUG_ON(!list_empty(&clp->cl_superblocks)); 249 250 nfs_free_client(clp); 251 } 252 } 253 254 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 255 /* 256 * Test if two ip6 socket addresses refer to the same socket by 257 * comparing relevant fields. The padding bytes specifically, are not 258 * compared. sin6_flowinfo is not compared because it only affects QoS 259 * and sin6_scope_id is only compared if the address is "link local" 260 * because "link local" addresses need only be unique to a specific 261 * link. Conversely, ordinary unicast addresses might have different 262 * sin6_scope_id. 263 * 264 * The caller should ensure both socket addresses are AF_INET6. 265 */ 266 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 267 const struct sockaddr *sa2) 268 { 269 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 270 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 271 272 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 273 sin1->sin6_scope_id != sin2->sin6_scope_id) 274 return 0; 275 276 return ipv6_addr_equal(&sin1->sin6_addr, &sin1->sin6_addr); 277 } 278 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 279 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 280 const struct sockaddr *sa2) 281 { 282 return 0; 283 } 284 #endif 285 286 /* 287 * Test if two ip4 socket addresses refer to the same socket, by 288 * comparing relevant fields. The padding bytes specifically, are 289 * not compared. 290 * 291 * The caller should ensure both socket addresses are AF_INET. 292 */ 293 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 294 const struct sockaddr *sa2) 295 { 296 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 297 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 298 299 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 300 } 301 302 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 303 const struct sockaddr *sa2) 304 { 305 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 306 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 307 308 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 309 (sin1->sin6_port == sin2->sin6_port); 310 } 311 312 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 313 const struct sockaddr *sa2) 314 { 315 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 316 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 317 318 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 319 (sin1->sin_port == sin2->sin_port); 320 } 321 322 /* 323 * Test if two socket addresses represent the same actual socket, 324 * by comparing (only) relevant fields, excluding the port number. 325 */ 326 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 327 const struct sockaddr *sa2) 328 { 329 if (sa1->sa_family != sa2->sa_family) 330 return 0; 331 332 switch (sa1->sa_family) { 333 case AF_INET: 334 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 335 case AF_INET6: 336 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 337 } 338 return 0; 339 } 340 341 /* 342 * Test if two socket addresses represent the same actual socket, 343 * by comparing (only) relevant fields, including the port number. 344 */ 345 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 346 const struct sockaddr *sa2) 347 { 348 if (sa1->sa_family != sa2->sa_family) 349 return 0; 350 351 switch (sa1->sa_family) { 352 case AF_INET: 353 return nfs_sockaddr_cmp_ip4(sa1, sa2); 354 case AF_INET6: 355 return nfs_sockaddr_cmp_ip6(sa1, sa2); 356 } 357 return 0; 358 } 359 360 /* 361 * Find a client by IP address and protocol version 362 * - returns NULL if no such client 363 */ 364 struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion) 365 { 366 struct nfs_client *clp; 367 368 spin_lock(&nfs_client_lock); 369 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 370 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 371 372 /* Don't match clients that failed to initialise properly */ 373 if (!(clp->cl_cons_state == NFS_CS_READY || 374 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 375 continue; 376 377 /* Different NFS versions cannot share the same nfs_client */ 378 if (clp->rpc_ops->version != nfsversion) 379 continue; 380 381 /* Match only the IP address, not the port number */ 382 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 383 continue; 384 385 atomic_inc(&clp->cl_count); 386 spin_unlock(&nfs_client_lock); 387 return clp; 388 } 389 spin_unlock(&nfs_client_lock); 390 return NULL; 391 } 392 393 /* 394 * Find a client by IP address and protocol version 395 * - returns NULL if no such client 396 */ 397 struct nfs_client *nfs_find_client_next(struct nfs_client *clp) 398 { 399 struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr; 400 u32 nfsvers = clp->rpc_ops->version; 401 402 spin_lock(&nfs_client_lock); 403 list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) { 404 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 405 406 /* Don't match clients that failed to initialise properly */ 407 if (clp->cl_cons_state != NFS_CS_READY) 408 continue; 409 410 /* Different NFS versions cannot share the same nfs_client */ 411 if (clp->rpc_ops->version != nfsvers) 412 continue; 413 414 /* Match only the IP address, not the port number */ 415 if (!nfs_sockaddr_match_ipaddr(sap, clap)) 416 continue; 417 418 atomic_inc(&clp->cl_count); 419 spin_unlock(&nfs_client_lock); 420 return clp; 421 } 422 spin_unlock(&nfs_client_lock); 423 return NULL; 424 } 425 426 /* 427 * Find an nfs_client on the list that matches the initialisation data 428 * that is supplied. 429 */ 430 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 431 { 432 struct nfs_client *clp; 433 const struct sockaddr *sap = data->addr; 434 435 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 436 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 437 /* Don't match clients that failed to initialise properly */ 438 if (clp->cl_cons_state < 0) 439 continue; 440 441 /* Different NFS versions cannot share the same nfs_client */ 442 if (clp->rpc_ops != data->rpc_ops) 443 continue; 444 445 if (clp->cl_proto != data->proto) 446 continue; 447 /* Match nfsv4 minorversion */ 448 if (clp->cl_minorversion != data->minorversion) 449 continue; 450 /* Match the full socket address */ 451 if (!nfs_sockaddr_cmp(sap, clap)) 452 continue; 453 454 atomic_inc(&clp->cl_count); 455 return clp; 456 } 457 return NULL; 458 } 459 460 /* 461 * Look up a client by IP address and protocol version 462 * - creates a new record if one doesn't yet exist 463 */ 464 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 465 { 466 struct nfs_client *clp, *new = NULL; 467 int error; 468 469 dprintk("--> nfs_get_client(%s,v%u)\n", 470 cl_init->hostname ?: "", cl_init->rpc_ops->version); 471 472 /* see if the client already exists */ 473 do { 474 spin_lock(&nfs_client_lock); 475 476 clp = nfs_match_client(cl_init); 477 if (clp) 478 goto found_client; 479 if (new) 480 goto install_client; 481 482 spin_unlock(&nfs_client_lock); 483 484 new = nfs_alloc_client(cl_init); 485 } while (!IS_ERR(new)); 486 487 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 488 return new; 489 490 /* install a new client and return with it unready */ 491 install_client: 492 clp = new; 493 list_add(&clp->cl_share_link, &nfs_client_list); 494 spin_unlock(&nfs_client_lock); 495 dprintk("--> nfs_get_client() = %p [new]\n", clp); 496 return clp; 497 498 /* found an existing client 499 * - make sure it's ready before returning 500 */ 501 found_client: 502 spin_unlock(&nfs_client_lock); 503 504 if (new) 505 nfs_free_client(new); 506 507 error = wait_event_killable(nfs_client_active_wq, 508 clp->cl_cons_state < NFS_CS_INITING); 509 if (error < 0) { 510 nfs_put_client(clp); 511 return ERR_PTR(-ERESTARTSYS); 512 } 513 514 if (clp->cl_cons_state < NFS_CS_READY) { 515 error = clp->cl_cons_state; 516 nfs_put_client(clp); 517 return ERR_PTR(error); 518 } 519 520 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 521 522 dprintk("--> nfs_get_client() = %p [share]\n", clp); 523 return clp; 524 } 525 526 /* 527 * Mark a server as ready or failed 528 */ 529 void nfs_mark_client_ready(struct nfs_client *clp, int state) 530 { 531 clp->cl_cons_state = state; 532 wake_up_all(&nfs_client_active_wq); 533 } 534 535 /* 536 * With sessions, the client is not marked ready until after a 537 * successful EXCHANGE_ID and CREATE_SESSION. 538 * 539 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 540 * other versions of NFS can be tried. 541 */ 542 int nfs4_check_client_ready(struct nfs_client *clp) 543 { 544 if (!nfs4_has_session(clp)) 545 return 0; 546 if (clp->cl_cons_state < NFS_CS_READY) 547 return -EPROTONOSUPPORT; 548 return 0; 549 } 550 551 /* 552 * Initialise the timeout values for a connection 553 */ 554 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 555 unsigned int timeo, unsigned int retrans) 556 { 557 to->to_initval = timeo * HZ / 10; 558 to->to_retries = retrans; 559 560 switch (proto) { 561 case XPRT_TRANSPORT_TCP: 562 case XPRT_TRANSPORT_RDMA: 563 if (to->to_retries == 0) 564 to->to_retries = NFS_DEF_TCP_RETRANS; 565 if (to->to_initval == 0) 566 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 567 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 568 to->to_initval = NFS_MAX_TCP_TIMEOUT; 569 to->to_increment = to->to_initval; 570 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 571 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 572 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 573 if (to->to_maxval < to->to_initval) 574 to->to_maxval = to->to_initval; 575 to->to_exponential = 0; 576 break; 577 case XPRT_TRANSPORT_UDP: 578 if (to->to_retries == 0) 579 to->to_retries = NFS_DEF_UDP_RETRANS; 580 if (!to->to_initval) 581 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 582 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 583 to->to_initval = NFS_MAX_UDP_TIMEOUT; 584 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 585 to->to_exponential = 1; 586 break; 587 default: 588 BUG(); 589 } 590 } 591 592 /* 593 * Create an RPC client handle 594 */ 595 static int nfs_create_rpc_client(struct nfs_client *clp, 596 const struct rpc_timeout *timeparms, 597 rpc_authflavor_t flavor, 598 int discrtry, int noresvport) 599 { 600 struct rpc_clnt *clnt = NULL; 601 struct rpc_create_args args = { 602 .protocol = clp->cl_proto, 603 .address = (struct sockaddr *)&clp->cl_addr, 604 .addrsize = clp->cl_addrlen, 605 .timeout = timeparms, 606 .servername = clp->cl_hostname, 607 .program = &nfs_program, 608 .version = clp->rpc_ops->version, 609 .authflavor = flavor, 610 }; 611 612 if (discrtry) 613 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 614 if (noresvport) 615 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 616 617 if (!IS_ERR(clp->cl_rpcclient)) 618 return 0; 619 620 clnt = rpc_create(&args); 621 if (IS_ERR(clnt)) { 622 dprintk("%s: cannot create RPC client. Error = %ld\n", 623 __func__, PTR_ERR(clnt)); 624 return PTR_ERR(clnt); 625 } 626 627 clp->cl_rpcclient = clnt; 628 return 0; 629 } 630 631 /* 632 * Version 2 or 3 client destruction 633 */ 634 static void nfs_destroy_server(struct nfs_server *server) 635 { 636 if (!(server->flags & NFS_MOUNT_NONLM)) 637 nlmclnt_done(server->nlm_host); 638 } 639 640 /* 641 * Version 2 or 3 lockd setup 642 */ 643 static int nfs_start_lockd(struct nfs_server *server) 644 { 645 struct nlm_host *host; 646 struct nfs_client *clp = server->nfs_client; 647 struct nlmclnt_initdata nlm_init = { 648 .hostname = clp->cl_hostname, 649 .address = (struct sockaddr *)&clp->cl_addr, 650 .addrlen = clp->cl_addrlen, 651 .protocol = server->flags & NFS_MOUNT_TCP ? 652 IPPROTO_TCP : IPPROTO_UDP, 653 .nfs_version = clp->rpc_ops->version, 654 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 655 1 : 0, 656 }; 657 658 if (nlm_init.nfs_version > 3) 659 return 0; 660 if (server->flags & NFS_MOUNT_NONLM) 661 return 0; 662 663 host = nlmclnt_init(&nlm_init); 664 if (IS_ERR(host)) 665 return PTR_ERR(host); 666 667 server->nlm_host = host; 668 server->destroy = nfs_destroy_server; 669 return 0; 670 } 671 672 /* 673 * Initialise an NFSv3 ACL client connection 674 */ 675 #ifdef CONFIG_NFS_V3_ACL 676 static void nfs_init_server_aclclient(struct nfs_server *server) 677 { 678 if (server->nfs_client->rpc_ops->version != 3) 679 goto out_noacl; 680 if (server->flags & NFS_MOUNT_NOACL) 681 goto out_noacl; 682 683 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 684 if (IS_ERR(server->client_acl)) 685 goto out_noacl; 686 687 /* No errors! Assume that Sun nfsacls are supported */ 688 server->caps |= NFS_CAP_ACLS; 689 return; 690 691 out_noacl: 692 server->caps &= ~NFS_CAP_ACLS; 693 } 694 #else 695 static inline void nfs_init_server_aclclient(struct nfs_server *server) 696 { 697 server->flags &= ~NFS_MOUNT_NOACL; 698 server->caps &= ~NFS_CAP_ACLS; 699 } 700 #endif 701 702 /* 703 * Create a general RPC client 704 */ 705 static int nfs_init_server_rpcclient(struct nfs_server *server, 706 const struct rpc_timeout *timeo, 707 rpc_authflavor_t pseudoflavour) 708 { 709 struct nfs_client *clp = server->nfs_client; 710 711 server->client = rpc_clone_client(clp->cl_rpcclient); 712 if (IS_ERR(server->client)) { 713 dprintk("%s: couldn't create rpc_client!\n", __func__); 714 return PTR_ERR(server->client); 715 } 716 717 memcpy(&server->client->cl_timeout_default, 718 timeo, 719 sizeof(server->client->cl_timeout_default)); 720 server->client->cl_timeout = &server->client->cl_timeout_default; 721 722 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 723 struct rpc_auth *auth; 724 725 auth = rpcauth_create(pseudoflavour, server->client); 726 if (IS_ERR(auth)) { 727 dprintk("%s: couldn't create credcache!\n", __func__); 728 return PTR_ERR(auth); 729 } 730 } 731 server->client->cl_softrtry = 0; 732 if (server->flags & NFS_MOUNT_SOFT) 733 server->client->cl_softrtry = 1; 734 735 return 0; 736 } 737 738 /* 739 * Initialise an NFS2 or NFS3 client 740 */ 741 static int nfs_init_client(struct nfs_client *clp, 742 const struct rpc_timeout *timeparms, 743 const struct nfs_parsed_mount_data *data) 744 { 745 int error; 746 747 if (clp->cl_cons_state == NFS_CS_READY) { 748 /* the client is already initialised */ 749 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 750 return 0; 751 } 752 753 /* 754 * Create a client RPC handle for doing FSSTAT with UNIX auth only 755 * - RFC 2623, sec 2.3.2 756 */ 757 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 758 0, data->flags & NFS_MOUNT_NORESVPORT); 759 if (error < 0) 760 goto error; 761 nfs_mark_client_ready(clp, NFS_CS_READY); 762 return 0; 763 764 error: 765 nfs_mark_client_ready(clp, error); 766 dprintk("<-- nfs_init_client() = xerror %d\n", error); 767 return error; 768 } 769 770 /* 771 * Create a version 2 or 3 client 772 */ 773 static int nfs_init_server(struct nfs_server *server, 774 const struct nfs_parsed_mount_data *data) 775 { 776 struct nfs_client_initdata cl_init = { 777 .hostname = data->nfs_server.hostname, 778 .addr = (const struct sockaddr *)&data->nfs_server.address, 779 .addrlen = data->nfs_server.addrlen, 780 .rpc_ops = &nfs_v2_clientops, 781 .proto = data->nfs_server.protocol, 782 }; 783 struct rpc_timeout timeparms; 784 struct nfs_client *clp; 785 int error; 786 787 dprintk("--> nfs_init_server()\n"); 788 789 #ifdef CONFIG_NFS_V3 790 if (data->flags & NFS_MOUNT_VER3) 791 cl_init.rpc_ops = &nfs_v3_clientops; 792 #endif 793 794 /* Allocate or find a client reference we can use */ 795 clp = nfs_get_client(&cl_init); 796 if (IS_ERR(clp)) { 797 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 798 return PTR_ERR(clp); 799 } 800 801 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 802 data->timeo, data->retrans); 803 error = nfs_init_client(clp, &timeparms, data); 804 if (error < 0) 805 goto error; 806 807 server->nfs_client = clp; 808 809 /* Initialise the client representation from the mount data */ 810 server->flags = data->flags; 811 server->options = data->options; 812 813 if (data->rsize) 814 server->rsize = nfs_block_size(data->rsize, NULL); 815 if (data->wsize) 816 server->wsize = nfs_block_size(data->wsize, NULL); 817 818 server->acregmin = data->acregmin * HZ; 819 server->acregmax = data->acregmax * HZ; 820 server->acdirmin = data->acdirmin * HZ; 821 server->acdirmax = data->acdirmax * HZ; 822 823 /* Start lockd here, before we might error out */ 824 error = nfs_start_lockd(server); 825 if (error < 0) 826 goto error; 827 828 server->port = data->nfs_server.port; 829 830 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 831 if (error < 0) 832 goto error; 833 834 /* Preserve the values of mount_server-related mount options */ 835 if (data->mount_server.addrlen) { 836 memcpy(&server->mountd_address, &data->mount_server.address, 837 data->mount_server.addrlen); 838 server->mountd_addrlen = data->mount_server.addrlen; 839 } 840 server->mountd_version = data->mount_server.version; 841 server->mountd_port = data->mount_server.port; 842 server->mountd_protocol = data->mount_server.protocol; 843 844 server->namelen = data->namlen; 845 /* Create a client RPC handle for the NFSv3 ACL management interface */ 846 nfs_init_server_aclclient(server); 847 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 848 return 0; 849 850 error: 851 server->nfs_client = NULL; 852 nfs_put_client(clp); 853 dprintk("<-- nfs_init_server() = xerror %d\n", error); 854 return error; 855 } 856 857 /* 858 * Load up the server record from information gained in an fsinfo record 859 */ 860 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 861 { 862 unsigned long max_rpc_payload; 863 864 /* Work out a lot of parameters */ 865 if (server->rsize == 0) 866 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 867 if (server->wsize == 0) 868 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 869 870 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 871 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 872 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 873 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 874 875 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 876 if (server->rsize > max_rpc_payload) 877 server->rsize = max_rpc_payload; 878 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 879 server->rsize = NFS_MAX_FILE_IO_SIZE; 880 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 881 882 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 883 884 if (server->wsize > max_rpc_payload) 885 server->wsize = max_rpc_payload; 886 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 887 server->wsize = NFS_MAX_FILE_IO_SIZE; 888 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 889 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 890 891 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 892 if (server->dtsize > PAGE_CACHE_SIZE) 893 server->dtsize = PAGE_CACHE_SIZE; 894 if (server->dtsize > server->rsize) 895 server->dtsize = server->rsize; 896 897 if (server->flags & NFS_MOUNT_NOAC) { 898 server->acregmin = server->acregmax = 0; 899 server->acdirmin = server->acdirmax = 0; 900 } 901 902 server->maxfilesize = fsinfo->maxfilesize; 903 904 /* We're airborne Set socket buffersize */ 905 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 906 } 907 908 /* 909 * Probe filesystem information, including the FSID on v2/v3 910 */ 911 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 912 { 913 struct nfs_fsinfo fsinfo; 914 struct nfs_client *clp = server->nfs_client; 915 int error; 916 917 dprintk("--> nfs_probe_fsinfo()\n"); 918 919 if (clp->rpc_ops->set_capabilities != NULL) { 920 error = clp->rpc_ops->set_capabilities(server, mntfh); 921 if (error < 0) 922 goto out_error; 923 } 924 925 fsinfo.fattr = fattr; 926 nfs_fattr_init(fattr); 927 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 928 if (error < 0) 929 goto out_error; 930 931 nfs_server_set_fsinfo(server, &fsinfo); 932 error = bdi_init(&server->backing_dev_info); 933 if (error) 934 goto out_error; 935 936 937 /* Get some general file system info */ 938 if (server->namelen == 0) { 939 struct nfs_pathconf pathinfo; 940 941 pathinfo.fattr = fattr; 942 nfs_fattr_init(fattr); 943 944 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 945 server->namelen = pathinfo.max_namelen; 946 } 947 948 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 949 return 0; 950 951 out_error: 952 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 953 return error; 954 } 955 956 /* 957 * Copy useful information when duplicating a server record 958 */ 959 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 960 { 961 target->flags = source->flags; 962 target->acregmin = source->acregmin; 963 target->acregmax = source->acregmax; 964 target->acdirmin = source->acdirmin; 965 target->acdirmax = source->acdirmax; 966 target->caps = source->caps; 967 } 968 969 /* 970 * Allocate and initialise a server record 971 */ 972 static struct nfs_server *nfs_alloc_server(void) 973 { 974 struct nfs_server *server; 975 976 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 977 if (!server) 978 return NULL; 979 980 server->client = server->client_acl = ERR_PTR(-EINVAL); 981 982 /* Zero out the NFS state stuff */ 983 INIT_LIST_HEAD(&server->client_link); 984 INIT_LIST_HEAD(&server->master_link); 985 986 atomic_set(&server->active, 0); 987 988 server->io_stats = nfs_alloc_iostats(); 989 if (!server->io_stats) { 990 kfree(server); 991 return NULL; 992 } 993 994 return server; 995 } 996 997 /* 998 * Free up a server record 999 */ 1000 void nfs_free_server(struct nfs_server *server) 1001 { 1002 dprintk("--> nfs_free_server()\n"); 1003 1004 spin_lock(&nfs_client_lock); 1005 list_del(&server->client_link); 1006 list_del(&server->master_link); 1007 spin_unlock(&nfs_client_lock); 1008 1009 if (server->destroy != NULL) 1010 server->destroy(server); 1011 1012 if (!IS_ERR(server->client_acl)) 1013 rpc_shutdown_client(server->client_acl); 1014 if (!IS_ERR(server->client)) 1015 rpc_shutdown_client(server->client); 1016 1017 nfs_put_client(server->nfs_client); 1018 1019 nfs_free_iostats(server->io_stats); 1020 bdi_destroy(&server->backing_dev_info); 1021 kfree(server); 1022 nfs_release_automount_timer(); 1023 dprintk("<-- nfs_free_server()\n"); 1024 } 1025 1026 /* 1027 * Create a version 2 or 3 volume record 1028 * - keyed on server and FSID 1029 */ 1030 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1031 struct nfs_fh *mntfh) 1032 { 1033 struct nfs_server *server; 1034 struct nfs_fattr fattr; 1035 int error; 1036 1037 server = nfs_alloc_server(); 1038 if (!server) 1039 return ERR_PTR(-ENOMEM); 1040 1041 /* Get a client representation */ 1042 error = nfs_init_server(server, data); 1043 if (error < 0) 1044 goto error; 1045 1046 BUG_ON(!server->nfs_client); 1047 BUG_ON(!server->nfs_client->rpc_ops); 1048 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1049 1050 /* Probe the root fh to retrieve its FSID */ 1051 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1052 if (error < 0) 1053 goto error; 1054 if (server->nfs_client->rpc_ops->version == 3) { 1055 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1056 server->namelen = NFS3_MAXNAMLEN; 1057 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1058 server->caps |= NFS_CAP_READDIRPLUS; 1059 } else { 1060 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1061 server->namelen = NFS2_MAXNAMLEN; 1062 } 1063 1064 if (!(fattr.valid & NFS_ATTR_FATTR)) { 1065 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr); 1066 if (error < 0) { 1067 dprintk("nfs_create_server: getattr error = %d\n", -error); 1068 goto error; 1069 } 1070 } 1071 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid)); 1072 1073 dprintk("Server FSID: %llx:%llx\n", 1074 (unsigned long long) server->fsid.major, 1075 (unsigned long long) server->fsid.minor); 1076 1077 BUG_ON(!server->nfs_client); 1078 BUG_ON(!server->nfs_client->rpc_ops); 1079 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1080 1081 spin_lock(&nfs_client_lock); 1082 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1083 list_add_tail(&server->master_link, &nfs_volume_list); 1084 spin_unlock(&nfs_client_lock); 1085 1086 server->mount_time = jiffies; 1087 return server; 1088 1089 error: 1090 nfs_free_server(server); 1091 return ERR_PTR(error); 1092 } 1093 1094 #ifdef CONFIG_NFS_V4 1095 /* 1096 * Initialize the NFS4 callback service 1097 */ 1098 static int nfs4_init_callback(struct nfs_client *clp) 1099 { 1100 int error; 1101 1102 if (clp->rpc_ops->version == 4) { 1103 if (nfs4_has_session(clp)) { 1104 error = xprt_setup_backchannel( 1105 clp->cl_rpcclient->cl_xprt, 1106 NFS41_BC_MIN_CALLBACKS); 1107 if (error < 0) 1108 return error; 1109 } 1110 1111 error = nfs_callback_up(clp->cl_minorversion, 1112 clp->cl_rpcclient->cl_xprt); 1113 if (error < 0) { 1114 dprintk("%s: failed to start callback. Error = %d\n", 1115 __func__, error); 1116 return error; 1117 } 1118 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1119 } 1120 return 0; 1121 } 1122 1123 /* 1124 * Initialize the minor version specific parts of an NFS4 client record 1125 */ 1126 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1127 { 1128 clp->cl_call_sync = _nfs4_call_sync; 1129 1130 #if defined(CONFIG_NFS_V4_1) 1131 if (clp->cl_minorversion) { 1132 struct nfs4_session *session = NULL; 1133 /* 1134 * Create the session and mark it expired. 1135 * When a SEQUENCE operation encounters the expired session 1136 * it will do session recovery to initialize it. 1137 */ 1138 session = nfs4_alloc_session(clp); 1139 if (!session) 1140 return -ENOMEM; 1141 1142 clp->cl_session = session; 1143 clp->cl_call_sync = _nfs4_call_sync_session; 1144 } 1145 #endif /* CONFIG_NFS_V4_1 */ 1146 1147 return nfs4_init_callback(clp); 1148 } 1149 1150 /* 1151 * Initialise an NFS4 client record 1152 */ 1153 static int nfs4_init_client(struct nfs_client *clp, 1154 const struct rpc_timeout *timeparms, 1155 const char *ip_addr, 1156 rpc_authflavor_t authflavour, 1157 int flags) 1158 { 1159 int error; 1160 1161 if (clp->cl_cons_state == NFS_CS_READY) { 1162 /* the client is initialised already */ 1163 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1164 return 0; 1165 } 1166 1167 /* Check NFS protocol revision and initialize RPC op vector */ 1168 clp->rpc_ops = &nfs_v4_clientops; 1169 1170 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1171 1, flags & NFS_MOUNT_NORESVPORT); 1172 if (error < 0) 1173 goto error; 1174 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1175 1176 error = nfs_idmap_new(clp); 1177 if (error < 0) { 1178 dprintk("%s: failed to create idmapper. Error = %d\n", 1179 __func__, error); 1180 goto error; 1181 } 1182 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1183 1184 error = nfs4_init_client_minor_version(clp); 1185 if (error < 0) 1186 goto error; 1187 1188 if (!nfs4_has_session(clp)) 1189 nfs_mark_client_ready(clp, NFS_CS_READY); 1190 return 0; 1191 1192 error: 1193 nfs_mark_client_ready(clp, error); 1194 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1195 return error; 1196 } 1197 1198 /* 1199 * Set up an NFS4 client 1200 */ 1201 static int nfs4_set_client(struct nfs_server *server, 1202 const char *hostname, 1203 const struct sockaddr *addr, 1204 const size_t addrlen, 1205 const char *ip_addr, 1206 rpc_authflavor_t authflavour, 1207 int proto, const struct rpc_timeout *timeparms, 1208 u32 minorversion) 1209 { 1210 struct nfs_client_initdata cl_init = { 1211 .hostname = hostname, 1212 .addr = addr, 1213 .addrlen = addrlen, 1214 .rpc_ops = &nfs_v4_clientops, 1215 .proto = proto, 1216 .minorversion = minorversion, 1217 }; 1218 struct nfs_client *clp; 1219 int error; 1220 1221 dprintk("--> nfs4_set_client()\n"); 1222 1223 /* Allocate or find a client reference we can use */ 1224 clp = nfs_get_client(&cl_init); 1225 if (IS_ERR(clp)) { 1226 error = PTR_ERR(clp); 1227 goto error; 1228 } 1229 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1230 server->flags); 1231 if (error < 0) 1232 goto error_put; 1233 1234 server->nfs_client = clp; 1235 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1236 return 0; 1237 1238 error_put: 1239 nfs_put_client(clp); 1240 error: 1241 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1242 return error; 1243 } 1244 1245 /* 1246 * Initialize a session. 1247 * Note: save the mount rsize and wsize for create_server negotiation. 1248 */ 1249 static void nfs4_init_session(struct nfs_client *clp, 1250 unsigned int wsize, unsigned int rsize) 1251 { 1252 #if defined(CONFIG_NFS_V4_1) 1253 if (nfs4_has_session(clp)) { 1254 clp->cl_session->fc_attrs.max_rqst_sz = wsize; 1255 clp->cl_session->fc_attrs.max_resp_sz = rsize; 1256 } 1257 #endif /* CONFIG_NFS_V4_1 */ 1258 } 1259 1260 /* 1261 * Session has been established, and the client marked ready. 1262 * Set the mount rsize and wsize with negotiated fore channel 1263 * attributes which will be bound checked in nfs_server_set_fsinfo. 1264 */ 1265 static void nfs4_session_set_rwsize(struct nfs_server *server) 1266 { 1267 #ifdef CONFIG_NFS_V4_1 1268 if (!nfs4_has_session(server->nfs_client)) 1269 return; 1270 server->rsize = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 1271 server->wsize = server->nfs_client->cl_session->fc_attrs.max_rqst_sz; 1272 #endif /* CONFIG_NFS_V4_1 */ 1273 } 1274 1275 /* 1276 * Create a version 4 volume record 1277 */ 1278 static int nfs4_init_server(struct nfs_server *server, 1279 const struct nfs_parsed_mount_data *data) 1280 { 1281 struct rpc_timeout timeparms; 1282 int error; 1283 1284 dprintk("--> nfs4_init_server()\n"); 1285 1286 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1287 data->timeo, data->retrans); 1288 1289 /* Initialise the client representation from the mount data */ 1290 server->flags = data->flags; 1291 server->caps |= NFS_CAP_ATOMIC_OPEN; 1292 server->options = data->options; 1293 1294 /* Get a client record */ 1295 error = nfs4_set_client(server, 1296 data->nfs_server.hostname, 1297 (const struct sockaddr *)&data->nfs_server.address, 1298 data->nfs_server.addrlen, 1299 data->client_address, 1300 data->auth_flavors[0], 1301 data->nfs_server.protocol, 1302 &timeparms, 1303 data->minorversion); 1304 if (error < 0) 1305 goto error; 1306 1307 if (data->rsize) 1308 server->rsize = nfs_block_size(data->rsize, NULL); 1309 if (data->wsize) 1310 server->wsize = nfs_block_size(data->wsize, NULL); 1311 1312 server->acregmin = data->acregmin * HZ; 1313 server->acregmax = data->acregmax * HZ; 1314 server->acdirmin = data->acdirmin * HZ; 1315 server->acdirmax = data->acdirmax * HZ; 1316 1317 server->port = data->nfs_server.port; 1318 1319 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1320 1321 error: 1322 /* Done */ 1323 dprintk("<-- nfs4_init_server() = %d\n", error); 1324 return error; 1325 } 1326 1327 /* 1328 * Create a version 4 volume record 1329 * - keyed on server and FSID 1330 */ 1331 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1332 struct nfs_fh *mntfh) 1333 { 1334 struct nfs_fattr fattr; 1335 struct nfs_server *server; 1336 int error; 1337 1338 dprintk("--> nfs4_create_server()\n"); 1339 1340 server = nfs_alloc_server(); 1341 if (!server) 1342 return ERR_PTR(-ENOMEM); 1343 1344 /* set up the general RPC client */ 1345 error = nfs4_init_server(server, data); 1346 if (error < 0) 1347 goto error; 1348 1349 BUG_ON(!server->nfs_client); 1350 BUG_ON(!server->nfs_client->rpc_ops); 1351 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1352 1353 nfs4_init_session(server->nfs_client, server->wsize, server->rsize); 1354 1355 /* Probe the root fh to retrieve its FSID */ 1356 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path); 1357 if (error < 0) 1358 goto error; 1359 1360 dprintk("Server FSID: %llx:%llx\n", 1361 (unsigned long long) server->fsid.major, 1362 (unsigned long long) server->fsid.minor); 1363 dprintk("Mount FH: %d\n", mntfh->size); 1364 1365 nfs4_session_set_rwsize(server); 1366 1367 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1368 if (error < 0) 1369 goto error; 1370 1371 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1372 server->namelen = NFS4_MAXNAMLEN; 1373 1374 BUG_ON(!server->nfs_client); 1375 BUG_ON(!server->nfs_client->rpc_ops); 1376 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1377 1378 spin_lock(&nfs_client_lock); 1379 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1380 list_add_tail(&server->master_link, &nfs_volume_list); 1381 spin_unlock(&nfs_client_lock); 1382 1383 server->mount_time = jiffies; 1384 dprintk("<-- nfs4_create_server() = %p\n", server); 1385 return server; 1386 1387 error: 1388 nfs_free_server(server); 1389 dprintk("<-- nfs4_create_server() = error %d\n", error); 1390 return ERR_PTR(error); 1391 } 1392 1393 /* 1394 * Create an NFS4 referral server record 1395 */ 1396 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1397 struct nfs_fh *mntfh) 1398 { 1399 struct nfs_client *parent_client; 1400 struct nfs_server *server, *parent_server; 1401 struct nfs_fattr fattr; 1402 int error; 1403 1404 dprintk("--> nfs4_create_referral_server()\n"); 1405 1406 server = nfs_alloc_server(); 1407 if (!server) 1408 return ERR_PTR(-ENOMEM); 1409 1410 parent_server = NFS_SB(data->sb); 1411 parent_client = parent_server->nfs_client; 1412 1413 /* Initialise the client representation from the parent server */ 1414 nfs_server_copy_userdata(server, parent_server); 1415 server->caps |= NFS_CAP_ATOMIC_OPEN; 1416 1417 /* Get a client representation. 1418 * Note: NFSv4 always uses TCP, */ 1419 error = nfs4_set_client(server, data->hostname, 1420 data->addr, 1421 data->addrlen, 1422 parent_client->cl_ipaddr, 1423 data->authflavor, 1424 parent_server->client->cl_xprt->prot, 1425 parent_server->client->cl_timeout, 1426 parent_client->cl_minorversion); 1427 if (error < 0) 1428 goto error; 1429 1430 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1431 if (error < 0) 1432 goto error; 1433 1434 BUG_ON(!server->nfs_client); 1435 BUG_ON(!server->nfs_client->rpc_ops); 1436 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1437 1438 /* Probe the root fh to retrieve its FSID and filehandle */ 1439 error = nfs4_path_walk(server, mntfh, data->mnt_path); 1440 if (error < 0) 1441 goto error; 1442 1443 /* probe the filesystem info for this server filesystem */ 1444 error = nfs_probe_fsinfo(server, mntfh, &fattr); 1445 if (error < 0) 1446 goto error; 1447 1448 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1449 server->namelen = NFS4_MAXNAMLEN; 1450 1451 dprintk("Referral FSID: %llx:%llx\n", 1452 (unsigned long long) server->fsid.major, 1453 (unsigned long long) server->fsid.minor); 1454 1455 spin_lock(&nfs_client_lock); 1456 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1457 list_add_tail(&server->master_link, &nfs_volume_list); 1458 spin_unlock(&nfs_client_lock); 1459 1460 server->mount_time = jiffies; 1461 1462 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1463 return server; 1464 1465 error: 1466 nfs_free_server(server); 1467 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1468 return ERR_PTR(error); 1469 } 1470 1471 #endif /* CONFIG_NFS_V4 */ 1472 1473 /* 1474 * Clone an NFS2, NFS3 or NFS4 server record 1475 */ 1476 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1477 struct nfs_fh *fh, 1478 struct nfs_fattr *fattr) 1479 { 1480 struct nfs_server *server; 1481 struct nfs_fattr fattr_fsinfo; 1482 int error; 1483 1484 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1485 (unsigned long long) fattr->fsid.major, 1486 (unsigned long long) fattr->fsid.minor); 1487 1488 server = nfs_alloc_server(); 1489 if (!server) 1490 return ERR_PTR(-ENOMEM); 1491 1492 /* Copy data from the source */ 1493 server->nfs_client = source->nfs_client; 1494 atomic_inc(&server->nfs_client->cl_count); 1495 nfs_server_copy_userdata(server, source); 1496 1497 server->fsid = fattr->fsid; 1498 1499 error = nfs_init_server_rpcclient(server, 1500 source->client->cl_timeout, 1501 source->client->cl_auth->au_flavor); 1502 if (error < 0) 1503 goto out_free_server; 1504 if (!IS_ERR(source->client_acl)) 1505 nfs_init_server_aclclient(server); 1506 1507 /* probe the filesystem info for this server filesystem */ 1508 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo); 1509 if (error < 0) 1510 goto out_free_server; 1511 1512 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1513 server->namelen = NFS4_MAXNAMLEN; 1514 1515 dprintk("Cloned FSID: %llx:%llx\n", 1516 (unsigned long long) server->fsid.major, 1517 (unsigned long long) server->fsid.minor); 1518 1519 error = nfs_start_lockd(server); 1520 if (error < 0) 1521 goto out_free_server; 1522 1523 spin_lock(&nfs_client_lock); 1524 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks); 1525 list_add_tail(&server->master_link, &nfs_volume_list); 1526 spin_unlock(&nfs_client_lock); 1527 1528 server->mount_time = jiffies; 1529 1530 dprintk("<-- nfs_clone_server() = %p\n", server); 1531 return server; 1532 1533 out_free_server: 1534 nfs_free_server(server); 1535 dprintk("<-- nfs_clone_server() = error %d\n", error); 1536 return ERR_PTR(error); 1537 } 1538 1539 #ifdef CONFIG_PROC_FS 1540 static struct proc_dir_entry *proc_fs_nfs; 1541 1542 static int nfs_server_list_open(struct inode *inode, struct file *file); 1543 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1544 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1545 static void nfs_server_list_stop(struct seq_file *p, void *v); 1546 static int nfs_server_list_show(struct seq_file *m, void *v); 1547 1548 static struct seq_operations nfs_server_list_ops = { 1549 .start = nfs_server_list_start, 1550 .next = nfs_server_list_next, 1551 .stop = nfs_server_list_stop, 1552 .show = nfs_server_list_show, 1553 }; 1554 1555 static const struct file_operations nfs_server_list_fops = { 1556 .open = nfs_server_list_open, 1557 .read = seq_read, 1558 .llseek = seq_lseek, 1559 .release = seq_release, 1560 .owner = THIS_MODULE, 1561 }; 1562 1563 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1564 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1565 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1566 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1567 static int nfs_volume_list_show(struct seq_file *m, void *v); 1568 1569 static struct seq_operations nfs_volume_list_ops = { 1570 .start = nfs_volume_list_start, 1571 .next = nfs_volume_list_next, 1572 .stop = nfs_volume_list_stop, 1573 .show = nfs_volume_list_show, 1574 }; 1575 1576 static const struct file_operations nfs_volume_list_fops = { 1577 .open = nfs_volume_list_open, 1578 .read = seq_read, 1579 .llseek = seq_lseek, 1580 .release = seq_release, 1581 .owner = THIS_MODULE, 1582 }; 1583 1584 /* 1585 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1586 * we're dealing 1587 */ 1588 static int nfs_server_list_open(struct inode *inode, struct file *file) 1589 { 1590 struct seq_file *m; 1591 int ret; 1592 1593 ret = seq_open(file, &nfs_server_list_ops); 1594 if (ret < 0) 1595 return ret; 1596 1597 m = file->private_data; 1598 m->private = PDE(inode)->data; 1599 1600 return 0; 1601 } 1602 1603 /* 1604 * set up the iterator to start reading from the server list and return the first item 1605 */ 1606 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1607 { 1608 /* lock the list against modification */ 1609 spin_lock(&nfs_client_lock); 1610 return seq_list_start_head(&nfs_client_list, *_pos); 1611 } 1612 1613 /* 1614 * move to next server 1615 */ 1616 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1617 { 1618 return seq_list_next(v, &nfs_client_list, pos); 1619 } 1620 1621 /* 1622 * clean up after reading from the transports list 1623 */ 1624 static void nfs_server_list_stop(struct seq_file *p, void *v) 1625 { 1626 spin_unlock(&nfs_client_lock); 1627 } 1628 1629 /* 1630 * display a header line followed by a load of call lines 1631 */ 1632 static int nfs_server_list_show(struct seq_file *m, void *v) 1633 { 1634 struct nfs_client *clp; 1635 1636 /* display header on line 1 */ 1637 if (v == &nfs_client_list) { 1638 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1639 return 0; 1640 } 1641 1642 /* display one transport per line on subsequent lines */ 1643 clp = list_entry(v, struct nfs_client, cl_share_link); 1644 1645 seq_printf(m, "v%u %s %s %3d %s\n", 1646 clp->rpc_ops->version, 1647 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1648 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1649 atomic_read(&clp->cl_count), 1650 clp->cl_hostname); 1651 1652 return 0; 1653 } 1654 1655 /* 1656 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1657 */ 1658 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1659 { 1660 struct seq_file *m; 1661 int ret; 1662 1663 ret = seq_open(file, &nfs_volume_list_ops); 1664 if (ret < 0) 1665 return ret; 1666 1667 m = file->private_data; 1668 m->private = PDE(inode)->data; 1669 1670 return 0; 1671 } 1672 1673 /* 1674 * set up the iterator to start reading from the volume list and return the first item 1675 */ 1676 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1677 { 1678 /* lock the list against modification */ 1679 spin_lock(&nfs_client_lock); 1680 return seq_list_start_head(&nfs_volume_list, *_pos); 1681 } 1682 1683 /* 1684 * move to next volume 1685 */ 1686 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1687 { 1688 return seq_list_next(v, &nfs_volume_list, pos); 1689 } 1690 1691 /* 1692 * clean up after reading from the transports list 1693 */ 1694 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1695 { 1696 spin_unlock(&nfs_client_lock); 1697 } 1698 1699 /* 1700 * display a header line followed by a load of call lines 1701 */ 1702 static int nfs_volume_list_show(struct seq_file *m, void *v) 1703 { 1704 struct nfs_server *server; 1705 struct nfs_client *clp; 1706 char dev[8], fsid[17]; 1707 1708 /* display header on line 1 */ 1709 if (v == &nfs_volume_list) { 1710 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1711 return 0; 1712 } 1713 /* display one transport per line on subsequent lines */ 1714 server = list_entry(v, struct nfs_server, master_link); 1715 clp = server->nfs_client; 1716 1717 snprintf(dev, 8, "%u:%u", 1718 MAJOR(server->s_dev), MINOR(server->s_dev)); 1719 1720 snprintf(fsid, 17, "%llx:%llx", 1721 (unsigned long long) server->fsid.major, 1722 (unsigned long long) server->fsid.minor); 1723 1724 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1725 clp->rpc_ops->version, 1726 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1727 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1728 dev, 1729 fsid, 1730 nfs_server_fscache_state(server)); 1731 1732 return 0; 1733 } 1734 1735 /* 1736 * initialise the /proc/fs/nfsfs/ directory 1737 */ 1738 int __init nfs_fs_proc_init(void) 1739 { 1740 struct proc_dir_entry *p; 1741 1742 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1743 if (!proc_fs_nfs) 1744 goto error_0; 1745 1746 /* a file of servers with which we're dealing */ 1747 p = proc_create("servers", S_IFREG|S_IRUGO, 1748 proc_fs_nfs, &nfs_server_list_fops); 1749 if (!p) 1750 goto error_1; 1751 1752 /* a file of volumes that we have mounted */ 1753 p = proc_create("volumes", S_IFREG|S_IRUGO, 1754 proc_fs_nfs, &nfs_volume_list_fops); 1755 if (!p) 1756 goto error_2; 1757 return 0; 1758 1759 error_2: 1760 remove_proc_entry("servers", proc_fs_nfs); 1761 error_1: 1762 remove_proc_entry("fs/nfsfs", NULL); 1763 error_0: 1764 return -ENOMEM; 1765 } 1766 1767 /* 1768 * clean up the /proc/fs/nfsfs/ directory 1769 */ 1770 void nfs_fs_proc_exit(void) 1771 { 1772 remove_proc_entry("volumes", proc_fs_nfs); 1773 remove_proc_entry("servers", proc_fs_nfs); 1774 remove_proc_entry("fs/nfsfs", NULL); 1775 } 1776 1777 #endif /* CONFIG_PROC_FS */ 1778