1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <net/ipv6.h> 40 #include <linux/nfs_xdr.h> 41 #include <linux/sunrpc/bc_xprt.h> 42 43 #include <asm/system.h> 44 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "pnfs.h" 52 53 #define NFSDBG_FACILITY NFSDBG_CLIENT 54 55 DEFINE_SPINLOCK(nfs_client_lock); 56 LIST_HEAD(nfs_client_list); 57 static LIST_HEAD(nfs_volume_list); 58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 59 #ifdef CONFIG_NFS_V4 60 static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */ 61 62 /* 63 * Get a unique NFSv4.0 callback identifier which will be used 64 * by the V4.0 callback service to lookup the nfs_client struct 65 */ 66 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 67 { 68 int ret = 0; 69 70 if (clp->rpc_ops->version != 4 || minorversion != 0) 71 return ret; 72 retry: 73 if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL)) 74 return -ENOMEM; 75 spin_lock(&nfs_client_lock); 76 ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident); 77 spin_unlock(&nfs_client_lock); 78 if (ret == -EAGAIN) 79 goto retry; 80 return ret; 81 } 82 #endif /* CONFIG_NFS_V4 */ 83 84 /* 85 * Turn off NFSv4 uid/gid mapping when using AUTH_SYS 86 */ 87 static bool nfs4_disable_idmapping = true; 88 89 /* 90 * RPC cruft for NFS 91 */ 92 static const struct rpc_version *nfs_version[5] = { 93 [2] = &nfs_version2, 94 #ifdef CONFIG_NFS_V3 95 [3] = &nfs_version3, 96 #endif 97 #ifdef CONFIG_NFS_V4 98 [4] = &nfs_version4, 99 #endif 100 }; 101 102 const struct rpc_program nfs_program = { 103 .name = "nfs", 104 .number = NFS_PROGRAM, 105 .nrvers = ARRAY_SIZE(nfs_version), 106 .version = nfs_version, 107 .stats = &nfs_rpcstat, 108 .pipe_dir_name = NFS_PIPE_DIRNAME, 109 }; 110 111 struct rpc_stat nfs_rpcstat = { 112 .program = &nfs_program 113 }; 114 115 116 #ifdef CONFIG_NFS_V3_ACL 117 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 118 static const struct rpc_version *nfsacl_version[] = { 119 [3] = &nfsacl_version3, 120 }; 121 122 const struct rpc_program nfsacl_program = { 123 .name = "nfsacl", 124 .number = NFS_ACL_PROGRAM, 125 .nrvers = ARRAY_SIZE(nfsacl_version), 126 .version = nfsacl_version, 127 .stats = &nfsacl_rpcstat, 128 }; 129 #endif /* CONFIG_NFS_V3_ACL */ 130 131 struct nfs_client_initdata { 132 const char *hostname; 133 const struct sockaddr *addr; 134 size_t addrlen; 135 const struct nfs_rpc_ops *rpc_ops; 136 int proto; 137 u32 minorversion; 138 struct net *net; 139 }; 140 141 /* 142 * Allocate a shared client record 143 * 144 * Since these are allocated/deallocated very rarely, we don't 145 * bother putting them in a slab cache... 146 */ 147 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 148 { 149 struct nfs_client *clp; 150 struct rpc_cred *cred; 151 int err = -ENOMEM; 152 153 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 154 goto error_0; 155 156 clp->rpc_ops = cl_init->rpc_ops; 157 158 atomic_set(&clp->cl_count, 1); 159 clp->cl_cons_state = NFS_CS_INITING; 160 161 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 162 clp->cl_addrlen = cl_init->addrlen; 163 164 if (cl_init->hostname) { 165 err = -ENOMEM; 166 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 167 if (!clp->cl_hostname) 168 goto error_cleanup; 169 } 170 171 INIT_LIST_HEAD(&clp->cl_superblocks); 172 clp->cl_rpcclient = ERR_PTR(-EINVAL); 173 174 clp->cl_proto = cl_init->proto; 175 176 #ifdef CONFIG_NFS_V4 177 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 178 if (err) 179 goto error_cleanup; 180 181 spin_lock_init(&clp->cl_lock); 182 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 183 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 184 clp->cl_boot_time = CURRENT_TIME; 185 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 186 clp->cl_minorversion = cl_init->minorversion; 187 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 188 #endif 189 cred = rpc_lookup_machine_cred("*"); 190 if (!IS_ERR(cred)) 191 clp->cl_machine_cred = cred; 192 nfs_fscache_get_client_cookie(clp); 193 clp->net = cl_init->net; 194 195 return clp; 196 197 error_cleanup: 198 kfree(clp); 199 error_0: 200 return ERR_PTR(err); 201 } 202 203 #ifdef CONFIG_NFS_V4 204 #ifdef CONFIG_NFS_V4_1 205 static void nfs4_shutdown_session(struct nfs_client *clp) 206 { 207 if (nfs4_has_session(clp)) 208 nfs4_destroy_session(clp->cl_session); 209 } 210 #else /* CONFIG_NFS_V4_1 */ 211 static void nfs4_shutdown_session(struct nfs_client *clp) 212 { 213 } 214 #endif /* CONFIG_NFS_V4_1 */ 215 216 /* 217 * Destroy the NFS4 callback service 218 */ 219 static void nfs4_destroy_callback(struct nfs_client *clp) 220 { 221 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 222 nfs_callback_down(clp->cl_mvops->minor_version); 223 } 224 225 static void nfs4_shutdown_client(struct nfs_client *clp) 226 { 227 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 228 nfs4_kill_renewd(clp); 229 nfs4_shutdown_session(clp); 230 nfs4_destroy_callback(clp); 231 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 232 nfs_idmap_delete(clp); 233 234 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 235 } 236 237 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 238 void nfs_cleanup_cb_ident_idr(void) 239 { 240 idr_destroy(&cb_ident_idr); 241 } 242 243 /* nfs_client_lock held */ 244 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 245 { 246 if (clp->cl_cb_ident) 247 idr_remove(&cb_ident_idr, clp->cl_cb_ident); 248 } 249 250 static void pnfs_init_server(struct nfs_server *server) 251 { 252 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 253 } 254 255 static void nfs4_destroy_server(struct nfs_server *server) 256 { 257 nfs4_purge_state_owners(server); 258 } 259 260 #else 261 static void nfs4_shutdown_client(struct nfs_client *clp) 262 { 263 } 264 265 void nfs_cleanup_cb_ident_idr(void) 266 { 267 } 268 269 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 270 { 271 } 272 273 static void pnfs_init_server(struct nfs_server *server) 274 { 275 } 276 277 #endif /* CONFIG_NFS_V4 */ 278 279 /* 280 * Destroy a shared client record 281 */ 282 static void nfs_free_client(struct nfs_client *clp) 283 { 284 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 285 286 nfs4_shutdown_client(clp); 287 288 nfs_fscache_release_client_cookie(clp); 289 290 /* -EIO all pending I/O */ 291 if (!IS_ERR(clp->cl_rpcclient)) 292 rpc_shutdown_client(clp->cl_rpcclient); 293 294 if (clp->cl_machine_cred != NULL) 295 put_rpccred(clp->cl_machine_cred); 296 297 nfs4_deviceid_purge_client(clp); 298 299 kfree(clp->cl_hostname); 300 kfree(clp->server_scope); 301 kfree(clp); 302 303 dprintk("<-- nfs_free_client()\n"); 304 } 305 306 /* 307 * Release a reference to a shared client record 308 */ 309 void nfs_put_client(struct nfs_client *clp) 310 { 311 if (!clp) 312 return; 313 314 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 315 316 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 317 list_del(&clp->cl_share_link); 318 nfs_cb_idr_remove_locked(clp); 319 spin_unlock(&nfs_client_lock); 320 321 BUG_ON(!list_empty(&clp->cl_superblocks)); 322 323 nfs_free_client(clp); 324 } 325 } 326 EXPORT_SYMBOL_GPL(nfs_put_client); 327 328 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 329 /* 330 * Test if two ip6 socket addresses refer to the same socket by 331 * comparing relevant fields. The padding bytes specifically, are not 332 * compared. sin6_flowinfo is not compared because it only affects QoS 333 * and sin6_scope_id is only compared if the address is "link local" 334 * because "link local" addresses need only be unique to a specific 335 * link. Conversely, ordinary unicast addresses might have different 336 * sin6_scope_id. 337 * 338 * The caller should ensure both socket addresses are AF_INET6. 339 */ 340 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 341 const struct sockaddr *sa2) 342 { 343 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 344 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 345 346 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 347 return 0; 348 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 349 return sin1->sin6_scope_id == sin2->sin6_scope_id; 350 351 return 1; 352 } 353 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 354 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 355 const struct sockaddr *sa2) 356 { 357 return 0; 358 } 359 #endif 360 361 /* 362 * Test if two ip4 socket addresses refer to the same socket, by 363 * comparing relevant fields. The padding bytes specifically, are 364 * not compared. 365 * 366 * The caller should ensure both socket addresses are AF_INET. 367 */ 368 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 369 const struct sockaddr *sa2) 370 { 371 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 372 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 373 374 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 375 } 376 377 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 378 const struct sockaddr *sa2) 379 { 380 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 381 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 382 383 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 384 (sin1->sin6_port == sin2->sin6_port); 385 } 386 387 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 388 const struct sockaddr *sa2) 389 { 390 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 391 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 392 393 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 394 (sin1->sin_port == sin2->sin_port); 395 } 396 397 /* 398 * Test if two socket addresses represent the same actual socket, 399 * by comparing (only) relevant fields, excluding the port number. 400 */ 401 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 402 const struct sockaddr *sa2) 403 { 404 if (sa1->sa_family != sa2->sa_family) 405 return 0; 406 407 switch (sa1->sa_family) { 408 case AF_INET: 409 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 410 case AF_INET6: 411 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 412 } 413 return 0; 414 } 415 416 /* 417 * Test if two socket addresses represent the same actual socket, 418 * by comparing (only) relevant fields, including the port number. 419 */ 420 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 421 const struct sockaddr *sa2) 422 { 423 if (sa1->sa_family != sa2->sa_family) 424 return 0; 425 426 switch (sa1->sa_family) { 427 case AF_INET: 428 return nfs_sockaddr_cmp_ip4(sa1, sa2); 429 case AF_INET6: 430 return nfs_sockaddr_cmp_ip6(sa1, sa2); 431 } 432 return 0; 433 } 434 435 /* Common match routine for v4.0 and v4.1 callback services */ 436 bool 437 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, 438 u32 minorversion) 439 { 440 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 441 442 /* Don't match clients that failed to initialise */ 443 if (!(clp->cl_cons_state == NFS_CS_READY || 444 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 445 return false; 446 447 /* Match the version and minorversion */ 448 if (clp->rpc_ops->version != 4 || 449 clp->cl_minorversion != minorversion) 450 return false; 451 452 /* Match only the IP address, not the port number */ 453 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 454 return false; 455 456 return true; 457 } 458 459 /* 460 * Find an nfs_client on the list that matches the initialisation data 461 * that is supplied. 462 */ 463 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 464 { 465 struct nfs_client *clp; 466 const struct sockaddr *sap = data->addr; 467 468 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 469 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 470 /* Don't match clients that failed to initialise properly */ 471 if (clp->cl_cons_state < 0) 472 continue; 473 474 /* Different NFS versions cannot share the same nfs_client */ 475 if (clp->rpc_ops != data->rpc_ops) 476 continue; 477 478 if (clp->cl_proto != data->proto) 479 continue; 480 /* Match nfsv4 minorversion */ 481 if (clp->cl_minorversion != data->minorversion) 482 continue; 483 /* Match the full socket address */ 484 if (!nfs_sockaddr_cmp(sap, clap)) 485 continue; 486 /* Match network namespace */ 487 if (clp->net != data->net) 488 continue; 489 490 atomic_inc(&clp->cl_count); 491 return clp; 492 } 493 return NULL; 494 } 495 496 /* 497 * Look up a client by IP address and protocol version 498 * - creates a new record if one doesn't yet exist 499 */ 500 static struct nfs_client * 501 nfs_get_client(const struct nfs_client_initdata *cl_init, 502 const struct rpc_timeout *timeparms, 503 const char *ip_addr, 504 rpc_authflavor_t authflavour, 505 int noresvport) 506 { 507 struct nfs_client *clp, *new = NULL; 508 int error; 509 510 dprintk("--> nfs_get_client(%s,v%u)\n", 511 cl_init->hostname ?: "", cl_init->rpc_ops->version); 512 513 /* see if the client already exists */ 514 do { 515 spin_lock(&nfs_client_lock); 516 517 clp = nfs_match_client(cl_init); 518 if (clp) 519 goto found_client; 520 if (new) 521 goto install_client; 522 523 spin_unlock(&nfs_client_lock); 524 525 new = nfs_alloc_client(cl_init); 526 } while (!IS_ERR(new)); 527 528 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 529 return new; 530 531 /* install a new client and return with it unready */ 532 install_client: 533 clp = new; 534 list_add(&clp->cl_share_link, &nfs_client_list); 535 spin_unlock(&nfs_client_lock); 536 537 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, 538 authflavour, noresvport); 539 if (error < 0) { 540 nfs_put_client(clp); 541 return ERR_PTR(error); 542 } 543 dprintk("--> nfs_get_client() = %p [new]\n", clp); 544 return clp; 545 546 /* found an existing client 547 * - make sure it's ready before returning 548 */ 549 found_client: 550 spin_unlock(&nfs_client_lock); 551 552 if (new) 553 nfs_free_client(new); 554 555 error = wait_event_killable(nfs_client_active_wq, 556 clp->cl_cons_state < NFS_CS_INITING); 557 if (error < 0) { 558 nfs_put_client(clp); 559 return ERR_PTR(-ERESTARTSYS); 560 } 561 562 if (clp->cl_cons_state < NFS_CS_READY) { 563 error = clp->cl_cons_state; 564 nfs_put_client(clp); 565 return ERR_PTR(error); 566 } 567 568 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 569 570 dprintk("--> nfs_get_client() = %p [share]\n", clp); 571 return clp; 572 } 573 574 /* 575 * Mark a server as ready or failed 576 */ 577 void nfs_mark_client_ready(struct nfs_client *clp, int state) 578 { 579 clp->cl_cons_state = state; 580 wake_up_all(&nfs_client_active_wq); 581 } 582 583 /* 584 * With sessions, the client is not marked ready until after a 585 * successful EXCHANGE_ID and CREATE_SESSION. 586 * 587 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 588 * other versions of NFS can be tried. 589 */ 590 int nfs4_check_client_ready(struct nfs_client *clp) 591 { 592 if (!nfs4_has_session(clp)) 593 return 0; 594 if (clp->cl_cons_state < NFS_CS_READY) 595 return -EPROTONOSUPPORT; 596 return 0; 597 } 598 599 /* 600 * Initialise the timeout values for a connection 601 */ 602 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 603 unsigned int timeo, unsigned int retrans) 604 { 605 to->to_initval = timeo * HZ / 10; 606 to->to_retries = retrans; 607 608 switch (proto) { 609 case XPRT_TRANSPORT_TCP: 610 case XPRT_TRANSPORT_RDMA: 611 if (to->to_retries == 0) 612 to->to_retries = NFS_DEF_TCP_RETRANS; 613 if (to->to_initval == 0) 614 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 615 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 616 to->to_initval = NFS_MAX_TCP_TIMEOUT; 617 to->to_increment = to->to_initval; 618 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 619 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 620 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 621 if (to->to_maxval < to->to_initval) 622 to->to_maxval = to->to_initval; 623 to->to_exponential = 0; 624 break; 625 case XPRT_TRANSPORT_UDP: 626 if (to->to_retries == 0) 627 to->to_retries = NFS_DEF_UDP_RETRANS; 628 if (!to->to_initval) 629 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 630 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 631 to->to_initval = NFS_MAX_UDP_TIMEOUT; 632 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 633 to->to_exponential = 1; 634 break; 635 default: 636 BUG(); 637 } 638 } 639 640 /* 641 * Create an RPC client handle 642 */ 643 static int nfs_create_rpc_client(struct nfs_client *clp, 644 const struct rpc_timeout *timeparms, 645 rpc_authflavor_t flavor, 646 int discrtry, int noresvport) 647 { 648 struct rpc_clnt *clnt = NULL; 649 struct rpc_create_args args = { 650 .net = clp->net, 651 .protocol = clp->cl_proto, 652 .address = (struct sockaddr *)&clp->cl_addr, 653 .addrsize = clp->cl_addrlen, 654 .timeout = timeparms, 655 .servername = clp->cl_hostname, 656 .program = &nfs_program, 657 .version = clp->rpc_ops->version, 658 .authflavor = flavor, 659 }; 660 661 if (discrtry) 662 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 663 if (noresvport) 664 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 665 666 if (!IS_ERR(clp->cl_rpcclient)) 667 return 0; 668 669 clnt = rpc_create(&args); 670 if (IS_ERR(clnt)) { 671 dprintk("%s: cannot create RPC client. Error = %ld\n", 672 __func__, PTR_ERR(clnt)); 673 return PTR_ERR(clnt); 674 } 675 676 clp->cl_rpcclient = clnt; 677 return 0; 678 } 679 680 /* 681 * Version 2 or 3 client destruction 682 */ 683 static void nfs_destroy_server(struct nfs_server *server) 684 { 685 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 686 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 687 nlmclnt_done(server->nlm_host); 688 } 689 690 /* 691 * Version 2 or 3 lockd setup 692 */ 693 static int nfs_start_lockd(struct nfs_server *server) 694 { 695 struct nlm_host *host; 696 struct nfs_client *clp = server->nfs_client; 697 struct nlmclnt_initdata nlm_init = { 698 .hostname = clp->cl_hostname, 699 .address = (struct sockaddr *)&clp->cl_addr, 700 .addrlen = clp->cl_addrlen, 701 .nfs_version = clp->rpc_ops->version, 702 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 703 1 : 0, 704 }; 705 706 if (nlm_init.nfs_version > 3) 707 return 0; 708 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 709 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 710 return 0; 711 712 switch (clp->cl_proto) { 713 default: 714 nlm_init.protocol = IPPROTO_TCP; 715 break; 716 case XPRT_TRANSPORT_UDP: 717 nlm_init.protocol = IPPROTO_UDP; 718 } 719 720 host = nlmclnt_init(&nlm_init); 721 if (IS_ERR(host)) 722 return PTR_ERR(host); 723 724 server->nlm_host = host; 725 server->destroy = nfs_destroy_server; 726 return 0; 727 } 728 729 /* 730 * Initialise an NFSv3 ACL client connection 731 */ 732 #ifdef CONFIG_NFS_V3_ACL 733 static void nfs_init_server_aclclient(struct nfs_server *server) 734 { 735 if (server->nfs_client->rpc_ops->version != 3) 736 goto out_noacl; 737 if (server->flags & NFS_MOUNT_NOACL) 738 goto out_noacl; 739 740 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 741 if (IS_ERR(server->client_acl)) 742 goto out_noacl; 743 744 /* No errors! Assume that Sun nfsacls are supported */ 745 server->caps |= NFS_CAP_ACLS; 746 return; 747 748 out_noacl: 749 server->caps &= ~NFS_CAP_ACLS; 750 } 751 #else 752 static inline void nfs_init_server_aclclient(struct nfs_server *server) 753 { 754 server->flags &= ~NFS_MOUNT_NOACL; 755 server->caps &= ~NFS_CAP_ACLS; 756 } 757 #endif 758 759 /* 760 * Create a general RPC client 761 */ 762 static int nfs_init_server_rpcclient(struct nfs_server *server, 763 const struct rpc_timeout *timeo, 764 rpc_authflavor_t pseudoflavour) 765 { 766 struct nfs_client *clp = server->nfs_client; 767 768 server->client = rpc_clone_client(clp->cl_rpcclient); 769 if (IS_ERR(server->client)) { 770 dprintk("%s: couldn't create rpc_client!\n", __func__); 771 return PTR_ERR(server->client); 772 } 773 774 memcpy(&server->client->cl_timeout_default, 775 timeo, 776 sizeof(server->client->cl_timeout_default)); 777 server->client->cl_timeout = &server->client->cl_timeout_default; 778 779 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 780 struct rpc_auth *auth; 781 782 auth = rpcauth_create(pseudoflavour, server->client); 783 if (IS_ERR(auth)) { 784 dprintk("%s: couldn't create credcache!\n", __func__); 785 return PTR_ERR(auth); 786 } 787 } 788 server->client->cl_softrtry = 0; 789 if (server->flags & NFS_MOUNT_SOFT) 790 server->client->cl_softrtry = 1; 791 792 return 0; 793 } 794 795 /* 796 * Initialise an NFS2 or NFS3 client 797 */ 798 int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, 799 const char *ip_addr, rpc_authflavor_t authflavour, 800 int noresvport) 801 { 802 int error; 803 804 if (clp->cl_cons_state == NFS_CS_READY) { 805 /* the client is already initialised */ 806 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 807 return 0; 808 } 809 810 /* 811 * Create a client RPC handle for doing FSSTAT with UNIX auth only 812 * - RFC 2623, sec 2.3.2 813 */ 814 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 815 0, noresvport); 816 if (error < 0) 817 goto error; 818 nfs_mark_client_ready(clp, NFS_CS_READY); 819 return 0; 820 821 error: 822 nfs_mark_client_ready(clp, error); 823 dprintk("<-- nfs_init_client() = xerror %d\n", error); 824 return error; 825 } 826 827 /* 828 * Create a version 2 or 3 client 829 */ 830 static int nfs_init_server(struct nfs_server *server, 831 const struct nfs_parsed_mount_data *data) 832 { 833 struct nfs_client_initdata cl_init = { 834 .hostname = data->nfs_server.hostname, 835 .addr = (const struct sockaddr *)&data->nfs_server.address, 836 .addrlen = data->nfs_server.addrlen, 837 .rpc_ops = &nfs_v2_clientops, 838 .proto = data->nfs_server.protocol, 839 .net = data->net, 840 }; 841 struct rpc_timeout timeparms; 842 struct nfs_client *clp; 843 int error; 844 845 dprintk("--> nfs_init_server()\n"); 846 847 #ifdef CONFIG_NFS_V3 848 if (data->version == 3) 849 cl_init.rpc_ops = &nfs_v3_clientops; 850 #endif 851 852 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 853 data->timeo, data->retrans); 854 855 /* Allocate or find a client reference we can use */ 856 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, 857 data->flags & NFS_MOUNT_NORESVPORT); 858 if (IS_ERR(clp)) { 859 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 860 return PTR_ERR(clp); 861 } 862 863 server->nfs_client = clp; 864 865 /* Initialise the client representation from the mount data */ 866 server->flags = data->flags; 867 server->options = data->options; 868 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 869 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 870 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 871 872 if (data->rsize) 873 server->rsize = nfs_block_size(data->rsize, NULL); 874 if (data->wsize) 875 server->wsize = nfs_block_size(data->wsize, NULL); 876 877 server->acregmin = data->acregmin * HZ; 878 server->acregmax = data->acregmax * HZ; 879 server->acdirmin = data->acdirmin * HZ; 880 server->acdirmax = data->acdirmax * HZ; 881 882 /* Start lockd here, before we might error out */ 883 error = nfs_start_lockd(server); 884 if (error < 0) 885 goto error; 886 887 server->port = data->nfs_server.port; 888 889 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 890 if (error < 0) 891 goto error; 892 893 /* Preserve the values of mount_server-related mount options */ 894 if (data->mount_server.addrlen) { 895 memcpy(&server->mountd_address, &data->mount_server.address, 896 data->mount_server.addrlen); 897 server->mountd_addrlen = data->mount_server.addrlen; 898 } 899 server->mountd_version = data->mount_server.version; 900 server->mountd_port = data->mount_server.port; 901 server->mountd_protocol = data->mount_server.protocol; 902 903 server->namelen = data->namlen; 904 /* Create a client RPC handle for the NFSv3 ACL management interface */ 905 nfs_init_server_aclclient(server); 906 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 907 return 0; 908 909 error: 910 server->nfs_client = NULL; 911 nfs_put_client(clp); 912 dprintk("<-- nfs_init_server() = xerror %d\n", error); 913 return error; 914 } 915 916 /* 917 * Load up the server record from information gained in an fsinfo record 918 */ 919 static void nfs_server_set_fsinfo(struct nfs_server *server, 920 struct nfs_fh *mntfh, 921 struct nfs_fsinfo *fsinfo) 922 { 923 unsigned long max_rpc_payload; 924 925 /* Work out a lot of parameters */ 926 if (server->rsize == 0) 927 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 928 if (server->wsize == 0) 929 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 930 931 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 932 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 933 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 934 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 935 936 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 937 if (server->rsize > max_rpc_payload) 938 server->rsize = max_rpc_payload; 939 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 940 server->rsize = NFS_MAX_FILE_IO_SIZE; 941 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 942 943 server->backing_dev_info.name = "nfs"; 944 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 945 946 if (server->wsize > max_rpc_payload) 947 server->wsize = max_rpc_payload; 948 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 949 server->wsize = NFS_MAX_FILE_IO_SIZE; 950 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 951 server->pnfs_blksize = fsinfo->blksize; 952 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype); 953 954 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 955 956 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 957 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 958 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 959 if (server->dtsize > server->rsize) 960 server->dtsize = server->rsize; 961 962 if (server->flags & NFS_MOUNT_NOAC) { 963 server->acregmin = server->acregmax = 0; 964 server->acdirmin = server->acdirmax = 0; 965 } 966 967 server->maxfilesize = fsinfo->maxfilesize; 968 969 server->time_delta = fsinfo->time_delta; 970 971 /* We're airborne Set socket buffersize */ 972 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 973 } 974 975 /* 976 * Probe filesystem information, including the FSID on v2/v3 977 */ 978 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 979 { 980 struct nfs_fsinfo fsinfo; 981 struct nfs_client *clp = server->nfs_client; 982 int error; 983 984 dprintk("--> nfs_probe_fsinfo()\n"); 985 986 if (clp->rpc_ops->set_capabilities != NULL) { 987 error = clp->rpc_ops->set_capabilities(server, mntfh); 988 if (error < 0) 989 goto out_error; 990 } 991 992 fsinfo.fattr = fattr; 993 fsinfo.layouttype = 0; 994 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 995 if (error < 0) 996 goto out_error; 997 998 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 999 1000 /* Get some general file system info */ 1001 if (server->namelen == 0) { 1002 struct nfs_pathconf pathinfo; 1003 1004 pathinfo.fattr = fattr; 1005 nfs_fattr_init(fattr); 1006 1007 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 1008 server->namelen = pathinfo.max_namelen; 1009 } 1010 1011 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 1012 return 0; 1013 1014 out_error: 1015 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1016 return error; 1017 } 1018 1019 /* 1020 * Copy useful information when duplicating a server record 1021 */ 1022 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1023 { 1024 target->flags = source->flags; 1025 target->rsize = source->rsize; 1026 target->wsize = source->wsize; 1027 target->acregmin = source->acregmin; 1028 target->acregmax = source->acregmax; 1029 target->acdirmin = source->acdirmin; 1030 target->acdirmax = source->acdirmax; 1031 target->caps = source->caps; 1032 target->options = source->options; 1033 } 1034 1035 static void nfs_server_insert_lists(struct nfs_server *server) 1036 { 1037 struct nfs_client *clp = server->nfs_client; 1038 1039 spin_lock(&nfs_client_lock); 1040 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1041 list_add_tail(&server->master_link, &nfs_volume_list); 1042 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1043 spin_unlock(&nfs_client_lock); 1044 1045 } 1046 1047 static void nfs_server_remove_lists(struct nfs_server *server) 1048 { 1049 struct nfs_client *clp = server->nfs_client; 1050 1051 spin_lock(&nfs_client_lock); 1052 list_del_rcu(&server->client_link); 1053 if (clp && list_empty(&clp->cl_superblocks)) 1054 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1055 list_del(&server->master_link); 1056 spin_unlock(&nfs_client_lock); 1057 1058 synchronize_rcu(); 1059 } 1060 1061 /* 1062 * Allocate and initialise a server record 1063 */ 1064 static struct nfs_server *nfs_alloc_server(void) 1065 { 1066 struct nfs_server *server; 1067 1068 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1069 if (!server) 1070 return NULL; 1071 1072 server->client = server->client_acl = ERR_PTR(-EINVAL); 1073 1074 /* Zero out the NFS state stuff */ 1075 INIT_LIST_HEAD(&server->client_link); 1076 INIT_LIST_HEAD(&server->master_link); 1077 INIT_LIST_HEAD(&server->delegations); 1078 INIT_LIST_HEAD(&server->layouts); 1079 INIT_LIST_HEAD(&server->state_owners_lru); 1080 1081 atomic_set(&server->active, 0); 1082 1083 server->io_stats = nfs_alloc_iostats(); 1084 if (!server->io_stats) { 1085 kfree(server); 1086 return NULL; 1087 } 1088 1089 if (bdi_init(&server->backing_dev_info)) { 1090 nfs_free_iostats(server->io_stats); 1091 kfree(server); 1092 return NULL; 1093 } 1094 1095 ida_init(&server->openowner_id); 1096 ida_init(&server->lockowner_id); 1097 pnfs_init_server(server); 1098 1099 return server; 1100 } 1101 1102 /* 1103 * Free up a server record 1104 */ 1105 void nfs_free_server(struct nfs_server *server) 1106 { 1107 dprintk("--> nfs_free_server()\n"); 1108 1109 nfs_server_remove_lists(server); 1110 unset_pnfs_layoutdriver(server); 1111 1112 if (server->destroy != NULL) 1113 server->destroy(server); 1114 1115 if (!IS_ERR(server->client_acl)) 1116 rpc_shutdown_client(server->client_acl); 1117 if (!IS_ERR(server->client)) 1118 rpc_shutdown_client(server->client); 1119 1120 nfs_put_client(server->nfs_client); 1121 1122 ida_destroy(&server->lockowner_id); 1123 ida_destroy(&server->openowner_id); 1124 nfs_free_iostats(server->io_stats); 1125 bdi_destroy(&server->backing_dev_info); 1126 kfree(server); 1127 nfs_release_automount_timer(); 1128 dprintk("<-- nfs_free_server()\n"); 1129 } 1130 1131 /* 1132 * Create a version 2 or 3 volume record 1133 * - keyed on server and FSID 1134 */ 1135 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1136 struct nfs_fh *mntfh) 1137 { 1138 struct nfs_server *server; 1139 struct nfs_fattr *fattr; 1140 int error; 1141 1142 server = nfs_alloc_server(); 1143 if (!server) 1144 return ERR_PTR(-ENOMEM); 1145 1146 error = -ENOMEM; 1147 fattr = nfs_alloc_fattr(); 1148 if (fattr == NULL) 1149 goto error; 1150 1151 /* Get a client representation */ 1152 error = nfs_init_server(server, data); 1153 if (error < 0) 1154 goto error; 1155 1156 BUG_ON(!server->nfs_client); 1157 BUG_ON(!server->nfs_client->rpc_ops); 1158 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1159 1160 /* Probe the root fh to retrieve its FSID */ 1161 error = nfs_probe_fsinfo(server, mntfh, fattr); 1162 if (error < 0) 1163 goto error; 1164 if (server->nfs_client->rpc_ops->version == 3) { 1165 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1166 server->namelen = NFS3_MAXNAMLEN; 1167 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1168 server->caps |= NFS_CAP_READDIRPLUS; 1169 } else { 1170 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1171 server->namelen = NFS2_MAXNAMLEN; 1172 } 1173 1174 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1175 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1176 if (error < 0) { 1177 dprintk("nfs_create_server: getattr error = %d\n", -error); 1178 goto error; 1179 } 1180 } 1181 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1182 1183 dprintk("Server FSID: %llx:%llx\n", 1184 (unsigned long long) server->fsid.major, 1185 (unsigned long long) server->fsid.minor); 1186 1187 nfs_server_insert_lists(server); 1188 server->mount_time = jiffies; 1189 nfs_free_fattr(fattr); 1190 return server; 1191 1192 error: 1193 nfs_free_fattr(fattr); 1194 nfs_free_server(server); 1195 return ERR_PTR(error); 1196 } 1197 1198 #ifdef CONFIG_NFS_V4 1199 /* 1200 * NFSv4.0 callback thread helper 1201 * 1202 * Find a client by callback identifier 1203 */ 1204 struct nfs_client * 1205 nfs4_find_client_ident(int cb_ident) 1206 { 1207 struct nfs_client *clp; 1208 1209 spin_lock(&nfs_client_lock); 1210 clp = idr_find(&cb_ident_idr, cb_ident); 1211 if (clp) 1212 atomic_inc(&clp->cl_count); 1213 spin_unlock(&nfs_client_lock); 1214 return clp; 1215 } 1216 1217 #if defined(CONFIG_NFS_V4_1) 1218 /* 1219 * NFSv4.1 callback thread helper 1220 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1221 * minorversion, and sessionID 1222 * 1223 * Returns NULL if no such client 1224 */ 1225 struct nfs_client * 1226 nfs4_find_client_sessionid(const struct sockaddr *addr, 1227 struct nfs4_sessionid *sid) 1228 { 1229 struct nfs_client *clp; 1230 1231 spin_lock(&nfs_client_lock); 1232 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1233 if (nfs4_cb_match_client(addr, clp, 1) == false) 1234 continue; 1235 1236 if (!nfs4_has_session(clp)) 1237 continue; 1238 1239 /* Match sessionid*/ 1240 if (memcmp(clp->cl_session->sess_id.data, 1241 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1242 continue; 1243 1244 atomic_inc(&clp->cl_count); 1245 spin_unlock(&nfs_client_lock); 1246 return clp; 1247 } 1248 spin_unlock(&nfs_client_lock); 1249 return NULL; 1250 } 1251 1252 #else /* CONFIG_NFS_V4_1 */ 1253 1254 struct nfs_client * 1255 nfs4_find_client_sessionid(const struct sockaddr *addr, 1256 struct nfs4_sessionid *sid) 1257 { 1258 return NULL; 1259 } 1260 #endif /* CONFIG_NFS_V4_1 */ 1261 1262 /* 1263 * Initialize the NFS4 callback service 1264 */ 1265 static int nfs4_init_callback(struct nfs_client *clp) 1266 { 1267 int error; 1268 1269 if (clp->rpc_ops->version == 4) { 1270 if (nfs4_has_session(clp)) { 1271 error = xprt_setup_backchannel( 1272 clp->cl_rpcclient->cl_xprt, 1273 NFS41_BC_MIN_CALLBACKS); 1274 if (error < 0) 1275 return error; 1276 } 1277 1278 error = nfs_callback_up(clp->cl_mvops->minor_version, 1279 clp->cl_rpcclient->cl_xprt); 1280 if (error < 0) { 1281 dprintk("%s: failed to start callback. Error = %d\n", 1282 __func__, error); 1283 return error; 1284 } 1285 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1286 } 1287 return 0; 1288 } 1289 1290 /* 1291 * Initialize the minor version specific parts of an NFS4 client record 1292 */ 1293 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1294 { 1295 #if defined(CONFIG_NFS_V4_1) 1296 if (clp->cl_mvops->minor_version) { 1297 struct nfs4_session *session = NULL; 1298 /* 1299 * Create the session and mark it expired. 1300 * When a SEQUENCE operation encounters the expired session 1301 * it will do session recovery to initialize it. 1302 */ 1303 session = nfs4_alloc_session(clp); 1304 if (!session) 1305 return -ENOMEM; 1306 1307 clp->cl_session = session; 1308 /* 1309 * The create session reply races with the server back 1310 * channel probe. Mark the client NFS_CS_SESSION_INITING 1311 * so that the client back channel can find the 1312 * nfs_client struct 1313 */ 1314 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1315 } 1316 #endif /* CONFIG_NFS_V4_1 */ 1317 1318 return nfs4_init_callback(clp); 1319 } 1320 1321 /* 1322 * Initialise an NFS4 client record 1323 */ 1324 int nfs4_init_client(struct nfs_client *clp, 1325 const struct rpc_timeout *timeparms, 1326 const char *ip_addr, 1327 rpc_authflavor_t authflavour, 1328 int noresvport) 1329 { 1330 int error; 1331 1332 if (clp->cl_cons_state == NFS_CS_READY) { 1333 /* the client is initialised already */ 1334 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1335 return 0; 1336 } 1337 1338 /* Check NFS protocol revision and initialize RPC op vector */ 1339 clp->rpc_ops = &nfs_v4_clientops; 1340 1341 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1342 1, noresvport); 1343 if (error < 0) 1344 goto error; 1345 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1346 1347 error = nfs_idmap_new(clp); 1348 if (error < 0) { 1349 dprintk("%s: failed to create idmapper. Error = %d\n", 1350 __func__, error); 1351 goto error; 1352 } 1353 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1354 1355 error = nfs4_init_client_minor_version(clp); 1356 if (error < 0) 1357 goto error; 1358 1359 if (!nfs4_has_session(clp)) 1360 nfs_mark_client_ready(clp, NFS_CS_READY); 1361 return 0; 1362 1363 error: 1364 nfs_mark_client_ready(clp, error); 1365 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1366 return error; 1367 } 1368 1369 /* 1370 * Set up an NFS4 client 1371 */ 1372 static int nfs4_set_client(struct nfs_server *server, 1373 const char *hostname, 1374 const struct sockaddr *addr, 1375 const size_t addrlen, 1376 const char *ip_addr, 1377 rpc_authflavor_t authflavour, 1378 int proto, const struct rpc_timeout *timeparms, 1379 u32 minorversion, struct net *net) 1380 { 1381 struct nfs_client_initdata cl_init = { 1382 .hostname = hostname, 1383 .addr = addr, 1384 .addrlen = addrlen, 1385 .rpc_ops = &nfs_v4_clientops, 1386 .proto = proto, 1387 .minorversion = minorversion, 1388 .net = net, 1389 }; 1390 struct nfs_client *clp; 1391 int error; 1392 1393 dprintk("--> nfs4_set_client()\n"); 1394 1395 /* Allocate or find a client reference we can use */ 1396 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1397 server->flags & NFS_MOUNT_NORESVPORT); 1398 if (IS_ERR(clp)) { 1399 error = PTR_ERR(clp); 1400 goto error; 1401 } 1402 1403 /* 1404 * Query for the lease time on clientid setup or renewal 1405 * 1406 * Note that this will be set on nfs_clients that were created 1407 * only for the DS role and did not set this bit, but now will 1408 * serve a dual role. 1409 */ 1410 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1411 1412 server->nfs_client = clp; 1413 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1414 return 0; 1415 error: 1416 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1417 return error; 1418 } 1419 1420 /* 1421 * Set up a pNFS Data Server client. 1422 * 1423 * Return any existing nfs_client that matches server address,port,version 1424 * and minorversion. 1425 * 1426 * For a new nfs_client, use a soft mount (default), a low retrans and a 1427 * low timeout interval so that if a connection is lost, we retry through 1428 * the MDS. 1429 */ 1430 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1431 const struct sockaddr *ds_addr, 1432 int ds_addrlen, int ds_proto) 1433 { 1434 struct nfs_client_initdata cl_init = { 1435 .addr = ds_addr, 1436 .addrlen = ds_addrlen, 1437 .rpc_ops = &nfs_v4_clientops, 1438 .proto = ds_proto, 1439 .minorversion = mds_clp->cl_minorversion, 1440 .net = mds_clp->net, 1441 }; 1442 struct rpc_timeout ds_timeout = { 1443 .to_initval = 15 * HZ, 1444 .to_maxval = 15 * HZ, 1445 .to_retries = 1, 1446 .to_exponential = 1, 1447 }; 1448 struct nfs_client *clp; 1449 1450 /* 1451 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1452 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1453 * (section 13.1 RFC 5661). 1454 */ 1455 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1456 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1457 1458 dprintk("<-- %s %p\n", __func__, clp); 1459 return clp; 1460 } 1461 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1462 1463 /* 1464 * Session has been established, and the client marked ready. 1465 * Set the mount rsize and wsize with negotiated fore channel 1466 * attributes which will be bound checked in nfs_server_set_fsinfo. 1467 */ 1468 static void nfs4_session_set_rwsize(struct nfs_server *server) 1469 { 1470 #ifdef CONFIG_NFS_V4_1 1471 struct nfs4_session *sess; 1472 u32 server_resp_sz; 1473 u32 server_rqst_sz; 1474 1475 if (!nfs4_has_session(server->nfs_client)) 1476 return; 1477 sess = server->nfs_client->cl_session; 1478 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1479 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1480 1481 if (server->rsize > server_resp_sz) 1482 server->rsize = server_resp_sz; 1483 if (server->wsize > server_rqst_sz) 1484 server->wsize = server_rqst_sz; 1485 #endif /* CONFIG_NFS_V4_1 */ 1486 } 1487 1488 static int nfs4_server_common_setup(struct nfs_server *server, 1489 struct nfs_fh *mntfh) 1490 { 1491 struct nfs_fattr *fattr; 1492 int error; 1493 1494 BUG_ON(!server->nfs_client); 1495 BUG_ON(!server->nfs_client->rpc_ops); 1496 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1497 1498 /* data servers support only a subset of NFSv4.1 */ 1499 if (is_ds_only_client(server->nfs_client)) 1500 return -EPROTONOSUPPORT; 1501 1502 fattr = nfs_alloc_fattr(); 1503 if (fattr == NULL) 1504 return -ENOMEM; 1505 1506 /* We must ensure the session is initialised first */ 1507 error = nfs4_init_session(server); 1508 if (error < 0) 1509 goto out; 1510 1511 /* Probe the root fh to retrieve its FSID and filehandle */ 1512 error = nfs4_get_rootfh(server, mntfh); 1513 if (error < 0) 1514 goto out; 1515 1516 dprintk("Server FSID: %llx:%llx\n", 1517 (unsigned long long) server->fsid.major, 1518 (unsigned long long) server->fsid.minor); 1519 dprintk("Mount FH: %d\n", mntfh->size); 1520 1521 nfs4_session_set_rwsize(server); 1522 1523 error = nfs_probe_fsinfo(server, mntfh, fattr); 1524 if (error < 0) 1525 goto out; 1526 1527 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1528 server->namelen = NFS4_MAXNAMLEN; 1529 1530 nfs_server_insert_lists(server); 1531 server->mount_time = jiffies; 1532 server->destroy = nfs4_destroy_server; 1533 out: 1534 nfs_free_fattr(fattr); 1535 return error; 1536 } 1537 1538 /* 1539 * Create a version 4 volume record 1540 */ 1541 static int nfs4_init_server(struct nfs_server *server, 1542 const struct nfs_parsed_mount_data *data) 1543 { 1544 struct rpc_timeout timeparms; 1545 int error; 1546 1547 dprintk("--> nfs4_init_server()\n"); 1548 1549 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1550 data->timeo, data->retrans); 1551 1552 /* Initialise the client representation from the mount data */ 1553 server->flags = data->flags; 1554 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1555 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1556 server->caps |= NFS_CAP_READDIRPLUS; 1557 server->options = data->options; 1558 1559 /* Get a client record */ 1560 error = nfs4_set_client(server, 1561 data->nfs_server.hostname, 1562 (const struct sockaddr *)&data->nfs_server.address, 1563 data->nfs_server.addrlen, 1564 data->client_address, 1565 data->auth_flavors[0], 1566 data->nfs_server.protocol, 1567 &timeparms, 1568 data->minorversion, 1569 data->net); 1570 if (error < 0) 1571 goto error; 1572 1573 /* 1574 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1575 * authentication. 1576 */ 1577 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1578 server->caps |= NFS_CAP_UIDGID_NOMAP; 1579 1580 if (data->rsize) 1581 server->rsize = nfs_block_size(data->rsize, NULL); 1582 if (data->wsize) 1583 server->wsize = nfs_block_size(data->wsize, NULL); 1584 1585 server->acregmin = data->acregmin * HZ; 1586 server->acregmax = data->acregmax * HZ; 1587 server->acdirmin = data->acdirmin * HZ; 1588 server->acdirmax = data->acdirmax * HZ; 1589 1590 server->port = data->nfs_server.port; 1591 1592 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1593 1594 error: 1595 /* Done */ 1596 dprintk("<-- nfs4_init_server() = %d\n", error); 1597 return error; 1598 } 1599 1600 /* 1601 * Create a version 4 volume record 1602 * - keyed on server and FSID 1603 */ 1604 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1605 struct nfs_fh *mntfh) 1606 { 1607 struct nfs_server *server; 1608 int error; 1609 1610 dprintk("--> nfs4_create_server()\n"); 1611 1612 server = nfs_alloc_server(); 1613 if (!server) 1614 return ERR_PTR(-ENOMEM); 1615 1616 /* set up the general RPC client */ 1617 error = nfs4_init_server(server, data); 1618 if (error < 0) 1619 goto error; 1620 1621 error = nfs4_server_common_setup(server, mntfh); 1622 if (error < 0) 1623 goto error; 1624 1625 dprintk("<-- nfs4_create_server() = %p\n", server); 1626 return server; 1627 1628 error: 1629 nfs_free_server(server); 1630 dprintk("<-- nfs4_create_server() = error %d\n", error); 1631 return ERR_PTR(error); 1632 } 1633 1634 /* 1635 * Create an NFS4 referral server record 1636 */ 1637 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1638 struct nfs_fh *mntfh) 1639 { 1640 struct nfs_client *parent_client; 1641 struct nfs_server *server, *parent_server; 1642 int error; 1643 1644 dprintk("--> nfs4_create_referral_server()\n"); 1645 1646 server = nfs_alloc_server(); 1647 if (!server) 1648 return ERR_PTR(-ENOMEM); 1649 1650 parent_server = NFS_SB(data->sb); 1651 parent_client = parent_server->nfs_client; 1652 1653 /* Initialise the client representation from the parent server */ 1654 nfs_server_copy_userdata(server, parent_server); 1655 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1656 1657 /* Get a client representation. 1658 * Note: NFSv4 always uses TCP, */ 1659 error = nfs4_set_client(server, data->hostname, 1660 data->addr, 1661 data->addrlen, 1662 parent_client->cl_ipaddr, 1663 data->authflavor, 1664 parent_server->client->cl_xprt->prot, 1665 parent_server->client->cl_timeout, 1666 parent_client->cl_mvops->minor_version, 1667 parent_client->net); 1668 if (error < 0) 1669 goto error; 1670 1671 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1672 if (error < 0) 1673 goto error; 1674 1675 error = nfs4_server_common_setup(server, mntfh); 1676 if (error < 0) 1677 goto error; 1678 1679 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1680 return server; 1681 1682 error: 1683 nfs_free_server(server); 1684 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1685 return ERR_PTR(error); 1686 } 1687 1688 #endif /* CONFIG_NFS_V4 */ 1689 1690 /* 1691 * Clone an NFS2, NFS3 or NFS4 server record 1692 */ 1693 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1694 struct nfs_fh *fh, 1695 struct nfs_fattr *fattr) 1696 { 1697 struct nfs_server *server; 1698 struct nfs_fattr *fattr_fsinfo; 1699 int error; 1700 1701 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1702 (unsigned long long) fattr->fsid.major, 1703 (unsigned long long) fattr->fsid.minor); 1704 1705 server = nfs_alloc_server(); 1706 if (!server) 1707 return ERR_PTR(-ENOMEM); 1708 1709 error = -ENOMEM; 1710 fattr_fsinfo = nfs_alloc_fattr(); 1711 if (fattr_fsinfo == NULL) 1712 goto out_free_server; 1713 1714 /* Copy data from the source */ 1715 server->nfs_client = source->nfs_client; 1716 server->destroy = source->destroy; 1717 atomic_inc(&server->nfs_client->cl_count); 1718 nfs_server_copy_userdata(server, source); 1719 1720 server->fsid = fattr->fsid; 1721 1722 error = nfs_init_server_rpcclient(server, 1723 source->client->cl_timeout, 1724 source->client->cl_auth->au_flavor); 1725 if (error < 0) 1726 goto out_free_server; 1727 if (!IS_ERR(source->client_acl)) 1728 nfs_init_server_aclclient(server); 1729 1730 /* probe the filesystem info for this server filesystem */ 1731 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1732 if (error < 0) 1733 goto out_free_server; 1734 1735 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1736 server->namelen = NFS4_MAXNAMLEN; 1737 1738 dprintk("Cloned FSID: %llx:%llx\n", 1739 (unsigned long long) server->fsid.major, 1740 (unsigned long long) server->fsid.minor); 1741 1742 error = nfs_start_lockd(server); 1743 if (error < 0) 1744 goto out_free_server; 1745 1746 nfs_server_insert_lists(server); 1747 server->mount_time = jiffies; 1748 1749 nfs_free_fattr(fattr_fsinfo); 1750 dprintk("<-- nfs_clone_server() = %p\n", server); 1751 return server; 1752 1753 out_free_server: 1754 nfs_free_fattr(fattr_fsinfo); 1755 nfs_free_server(server); 1756 dprintk("<-- nfs_clone_server() = error %d\n", error); 1757 return ERR_PTR(error); 1758 } 1759 1760 #ifdef CONFIG_PROC_FS 1761 static struct proc_dir_entry *proc_fs_nfs; 1762 1763 static int nfs_server_list_open(struct inode *inode, struct file *file); 1764 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1765 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1766 static void nfs_server_list_stop(struct seq_file *p, void *v); 1767 static int nfs_server_list_show(struct seq_file *m, void *v); 1768 1769 static const struct seq_operations nfs_server_list_ops = { 1770 .start = nfs_server_list_start, 1771 .next = nfs_server_list_next, 1772 .stop = nfs_server_list_stop, 1773 .show = nfs_server_list_show, 1774 }; 1775 1776 static const struct file_operations nfs_server_list_fops = { 1777 .open = nfs_server_list_open, 1778 .read = seq_read, 1779 .llseek = seq_lseek, 1780 .release = seq_release, 1781 .owner = THIS_MODULE, 1782 }; 1783 1784 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1785 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1786 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1787 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1788 static int nfs_volume_list_show(struct seq_file *m, void *v); 1789 1790 static const struct seq_operations nfs_volume_list_ops = { 1791 .start = nfs_volume_list_start, 1792 .next = nfs_volume_list_next, 1793 .stop = nfs_volume_list_stop, 1794 .show = nfs_volume_list_show, 1795 }; 1796 1797 static const struct file_operations nfs_volume_list_fops = { 1798 .open = nfs_volume_list_open, 1799 .read = seq_read, 1800 .llseek = seq_lseek, 1801 .release = seq_release, 1802 .owner = THIS_MODULE, 1803 }; 1804 1805 /* 1806 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1807 * we're dealing 1808 */ 1809 static int nfs_server_list_open(struct inode *inode, struct file *file) 1810 { 1811 struct seq_file *m; 1812 int ret; 1813 1814 ret = seq_open(file, &nfs_server_list_ops); 1815 if (ret < 0) 1816 return ret; 1817 1818 m = file->private_data; 1819 m->private = PDE(inode)->data; 1820 1821 return 0; 1822 } 1823 1824 /* 1825 * set up the iterator to start reading from the server list and return the first item 1826 */ 1827 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1828 { 1829 /* lock the list against modification */ 1830 spin_lock(&nfs_client_lock); 1831 return seq_list_start_head(&nfs_client_list, *_pos); 1832 } 1833 1834 /* 1835 * move to next server 1836 */ 1837 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1838 { 1839 return seq_list_next(v, &nfs_client_list, pos); 1840 } 1841 1842 /* 1843 * clean up after reading from the transports list 1844 */ 1845 static void nfs_server_list_stop(struct seq_file *p, void *v) 1846 { 1847 spin_unlock(&nfs_client_lock); 1848 } 1849 1850 /* 1851 * display a header line followed by a load of call lines 1852 */ 1853 static int nfs_server_list_show(struct seq_file *m, void *v) 1854 { 1855 struct nfs_client *clp; 1856 1857 /* display header on line 1 */ 1858 if (v == &nfs_client_list) { 1859 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1860 return 0; 1861 } 1862 1863 /* display one transport per line on subsequent lines */ 1864 clp = list_entry(v, struct nfs_client, cl_share_link); 1865 1866 /* Check if the client is initialized */ 1867 if (clp->cl_cons_state != NFS_CS_READY) 1868 return 0; 1869 1870 seq_printf(m, "v%u %s %s %3d %s\n", 1871 clp->rpc_ops->version, 1872 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1873 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1874 atomic_read(&clp->cl_count), 1875 clp->cl_hostname); 1876 1877 return 0; 1878 } 1879 1880 /* 1881 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1882 */ 1883 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1884 { 1885 struct seq_file *m; 1886 int ret; 1887 1888 ret = seq_open(file, &nfs_volume_list_ops); 1889 if (ret < 0) 1890 return ret; 1891 1892 m = file->private_data; 1893 m->private = PDE(inode)->data; 1894 1895 return 0; 1896 } 1897 1898 /* 1899 * set up the iterator to start reading from the volume list and return the first item 1900 */ 1901 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1902 { 1903 /* lock the list against modification */ 1904 spin_lock(&nfs_client_lock); 1905 return seq_list_start_head(&nfs_volume_list, *_pos); 1906 } 1907 1908 /* 1909 * move to next volume 1910 */ 1911 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1912 { 1913 return seq_list_next(v, &nfs_volume_list, pos); 1914 } 1915 1916 /* 1917 * clean up after reading from the transports list 1918 */ 1919 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1920 { 1921 spin_unlock(&nfs_client_lock); 1922 } 1923 1924 /* 1925 * display a header line followed by a load of call lines 1926 */ 1927 static int nfs_volume_list_show(struct seq_file *m, void *v) 1928 { 1929 struct nfs_server *server; 1930 struct nfs_client *clp; 1931 char dev[8], fsid[17]; 1932 1933 /* display header on line 1 */ 1934 if (v == &nfs_volume_list) { 1935 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1936 return 0; 1937 } 1938 /* display one transport per line on subsequent lines */ 1939 server = list_entry(v, struct nfs_server, master_link); 1940 clp = server->nfs_client; 1941 1942 snprintf(dev, 8, "%u:%u", 1943 MAJOR(server->s_dev), MINOR(server->s_dev)); 1944 1945 snprintf(fsid, 17, "%llx:%llx", 1946 (unsigned long long) server->fsid.major, 1947 (unsigned long long) server->fsid.minor); 1948 1949 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1950 clp->rpc_ops->version, 1951 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1952 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1953 dev, 1954 fsid, 1955 nfs_server_fscache_state(server)); 1956 1957 return 0; 1958 } 1959 1960 /* 1961 * initialise the /proc/fs/nfsfs/ directory 1962 */ 1963 int __init nfs_fs_proc_init(void) 1964 { 1965 struct proc_dir_entry *p; 1966 1967 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1968 if (!proc_fs_nfs) 1969 goto error_0; 1970 1971 /* a file of servers with which we're dealing */ 1972 p = proc_create("servers", S_IFREG|S_IRUGO, 1973 proc_fs_nfs, &nfs_server_list_fops); 1974 if (!p) 1975 goto error_1; 1976 1977 /* a file of volumes that we have mounted */ 1978 p = proc_create("volumes", S_IFREG|S_IRUGO, 1979 proc_fs_nfs, &nfs_volume_list_fops); 1980 if (!p) 1981 goto error_2; 1982 return 0; 1983 1984 error_2: 1985 remove_proc_entry("servers", proc_fs_nfs); 1986 error_1: 1987 remove_proc_entry("fs/nfsfs", NULL); 1988 error_0: 1989 return -ENOMEM; 1990 } 1991 1992 /* 1993 * clean up the /proc/fs/nfsfs/ directory 1994 */ 1995 void nfs_fs_proc_exit(void) 1996 { 1997 remove_proc_entry("volumes", proc_fs_nfs); 1998 remove_proc_entry("servers", proc_fs_nfs); 1999 remove_proc_entry("fs/nfsfs", NULL); 2000 } 2001 2002 #endif /* CONFIG_PROC_FS */ 2003 2004 module_param(nfs4_disable_idmapping, bool, 0644); 2005 MODULE_PARM_DESC(nfs4_disable_idmapping, 2006 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2007