1 /* client.c: NFS client sharing and management code 2 * 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/sched.h> 16 #include <linux/time.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/string.h> 20 #include <linux/stat.h> 21 #include <linux/errno.h> 22 #include <linux/unistd.h> 23 #include <linux/sunrpc/clnt.h> 24 #include <linux/sunrpc/stats.h> 25 #include <linux/sunrpc/metrics.h> 26 #include <linux/sunrpc/xprtsock.h> 27 #include <linux/sunrpc/xprtrdma.h> 28 #include <linux/nfs_fs.h> 29 #include <linux/nfs_mount.h> 30 #include <linux/nfs4_mount.h> 31 #include <linux/lockd/bind.h> 32 #include <linux/seq_file.h> 33 #include <linux/mount.h> 34 #include <linux/nfs_idmap.h> 35 #include <linux/vfs.h> 36 #include <linux/inet.h> 37 #include <linux/in6.h> 38 #include <linux/slab.h> 39 #include <net/ipv6.h> 40 #include <linux/nfs_xdr.h> 41 #include <linux/sunrpc/bc_xprt.h> 42 43 #include <asm/system.h> 44 45 #include "nfs4_fs.h" 46 #include "callback.h" 47 #include "delegation.h" 48 #include "iostat.h" 49 #include "internal.h" 50 #include "fscache.h" 51 #include "pnfs.h" 52 53 #define NFSDBG_FACILITY NFSDBG_CLIENT 54 55 static DEFINE_SPINLOCK(nfs_client_lock); 56 static LIST_HEAD(nfs_client_list); 57 static LIST_HEAD(nfs_volume_list); 58 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); 59 #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 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 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 struct rpc_version * nfsacl_version[] = { 119 [3] = &nfsacl_version3, 120 }; 121 122 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 }; 139 140 /* 141 * Allocate a shared client record 142 * 143 * Since these are allocated/deallocated very rarely, we don't 144 * bother putting them in a slab cache... 145 */ 146 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 147 { 148 struct nfs_client *clp; 149 struct rpc_cred *cred; 150 int err = -ENOMEM; 151 152 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 153 goto error_0; 154 155 clp->rpc_ops = cl_init->rpc_ops; 156 157 atomic_set(&clp->cl_count, 1); 158 clp->cl_cons_state = NFS_CS_INITING; 159 160 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 161 clp->cl_addrlen = cl_init->addrlen; 162 163 if (cl_init->hostname) { 164 err = -ENOMEM; 165 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 166 if (!clp->cl_hostname) 167 goto error_cleanup; 168 } 169 170 INIT_LIST_HEAD(&clp->cl_superblocks); 171 clp->cl_rpcclient = ERR_PTR(-EINVAL); 172 173 clp->cl_proto = cl_init->proto; 174 175 #ifdef CONFIG_NFS_V4 176 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 177 if (err) 178 goto error_cleanup; 179 180 spin_lock_init(&clp->cl_lock); 181 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 182 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 183 clp->cl_boot_time = CURRENT_TIME; 184 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 185 clp->cl_minorversion = cl_init->minorversion; 186 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 187 #endif 188 cred = rpc_lookup_machine_cred("*"); 189 if (!IS_ERR(cred)) 190 clp->cl_machine_cred = cred; 191 nfs_fscache_get_client_cookie(clp); 192 193 return clp; 194 195 error_cleanup: 196 kfree(clp); 197 error_0: 198 return ERR_PTR(err); 199 } 200 201 #ifdef CONFIG_NFS_V4 202 #ifdef CONFIG_NFS_V4_1 203 static void nfs4_shutdown_session(struct nfs_client *clp) 204 { 205 if (nfs4_has_session(clp)) 206 nfs4_destroy_session(clp->cl_session); 207 } 208 #else /* CONFIG_NFS_V4_1 */ 209 static void nfs4_shutdown_session(struct nfs_client *clp) 210 { 211 } 212 #endif /* CONFIG_NFS_V4_1 */ 213 214 /* 215 * Destroy the NFS4 callback service 216 */ 217 static void nfs4_destroy_callback(struct nfs_client *clp) 218 { 219 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 220 nfs_callback_down(clp->cl_mvops->minor_version); 221 } 222 223 static void nfs4_shutdown_client(struct nfs_client *clp) 224 { 225 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 226 nfs4_kill_renewd(clp); 227 nfs4_shutdown_session(clp); 228 nfs4_destroy_callback(clp); 229 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 230 nfs_idmap_delete(clp); 231 232 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 233 } 234 235 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 236 void nfs_cleanup_cb_ident_idr(void) 237 { 238 idr_destroy(&cb_ident_idr); 239 } 240 241 /* nfs_client_lock held */ 242 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 243 { 244 if (clp->cl_cb_ident) 245 idr_remove(&cb_ident_idr, clp->cl_cb_ident); 246 } 247 248 static void pnfs_init_server(struct nfs_server *server) 249 { 250 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 251 } 252 253 static void nfs4_destroy_server(struct nfs_server *server) 254 { 255 nfs4_purge_state_owners(server); 256 } 257 258 #else 259 static void nfs4_shutdown_client(struct nfs_client *clp) 260 { 261 } 262 263 void nfs_cleanup_cb_ident_idr(void) 264 { 265 } 266 267 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 268 { 269 } 270 271 static void pnfs_init_server(struct nfs_server *server) 272 { 273 } 274 275 #endif /* CONFIG_NFS_V4 */ 276 277 /* 278 * Destroy a shared client record 279 */ 280 static void nfs_free_client(struct nfs_client *clp) 281 { 282 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 283 284 nfs4_shutdown_client(clp); 285 286 nfs_fscache_release_client_cookie(clp); 287 288 /* -EIO all pending I/O */ 289 if (!IS_ERR(clp->cl_rpcclient)) 290 rpc_shutdown_client(clp->cl_rpcclient); 291 292 if (clp->cl_machine_cred != NULL) 293 put_rpccred(clp->cl_machine_cred); 294 295 nfs4_deviceid_purge_client(clp); 296 297 kfree(clp->cl_hostname); 298 kfree(clp->server_scope); 299 kfree(clp); 300 301 dprintk("<-- nfs_free_client()\n"); 302 } 303 304 /* 305 * Release a reference to a shared client record 306 */ 307 void nfs_put_client(struct nfs_client *clp) 308 { 309 if (!clp) 310 return; 311 312 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 313 314 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 315 list_del(&clp->cl_share_link); 316 nfs_cb_idr_remove_locked(clp); 317 spin_unlock(&nfs_client_lock); 318 319 BUG_ON(!list_empty(&clp->cl_superblocks)); 320 321 nfs_free_client(clp); 322 } 323 } 324 EXPORT_SYMBOL_GPL(nfs_put_client); 325 326 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 327 /* 328 * Test if two ip6 socket addresses refer to the same socket by 329 * comparing relevant fields. The padding bytes specifically, are not 330 * compared. sin6_flowinfo is not compared because it only affects QoS 331 * and sin6_scope_id is only compared if the address is "link local" 332 * because "link local" addresses need only be unique to a specific 333 * link. Conversely, ordinary unicast addresses might have different 334 * sin6_scope_id. 335 * 336 * The caller should ensure both socket addresses are AF_INET6. 337 */ 338 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 339 const struct sockaddr *sa2) 340 { 341 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 342 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 343 344 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) 345 return 0; 346 else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL) 347 return sin1->sin6_scope_id == sin2->sin6_scope_id; 348 349 return 1; 350 } 351 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 352 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 353 const struct sockaddr *sa2) 354 { 355 return 0; 356 } 357 #endif 358 359 /* 360 * Test if two ip4 socket addresses refer to the same socket, by 361 * comparing relevant fields. The padding bytes specifically, are 362 * not compared. 363 * 364 * The caller should ensure both socket addresses are AF_INET. 365 */ 366 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 367 const struct sockaddr *sa2) 368 { 369 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 370 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 371 372 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 373 } 374 375 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 376 const struct sockaddr *sa2) 377 { 378 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 379 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 380 381 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 382 (sin1->sin6_port == sin2->sin6_port); 383 } 384 385 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 386 const struct sockaddr *sa2) 387 { 388 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 389 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 390 391 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 392 (sin1->sin_port == sin2->sin_port); 393 } 394 395 /* 396 * Test if two socket addresses represent the same actual socket, 397 * by comparing (only) relevant fields, excluding the port number. 398 */ 399 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 400 const struct sockaddr *sa2) 401 { 402 if (sa1->sa_family != sa2->sa_family) 403 return 0; 404 405 switch (sa1->sa_family) { 406 case AF_INET: 407 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 408 case AF_INET6: 409 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 410 } 411 return 0; 412 } 413 414 /* 415 * Test if two socket addresses represent the same actual socket, 416 * by comparing (only) relevant fields, including the port number. 417 */ 418 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 419 const struct sockaddr *sa2) 420 { 421 if (sa1->sa_family != sa2->sa_family) 422 return 0; 423 424 switch (sa1->sa_family) { 425 case AF_INET: 426 return nfs_sockaddr_cmp_ip4(sa1, sa2); 427 case AF_INET6: 428 return nfs_sockaddr_cmp_ip6(sa1, sa2); 429 } 430 return 0; 431 } 432 433 /* Common match routine for v4.0 and v4.1 callback services */ 434 bool 435 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, 436 u32 minorversion) 437 { 438 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 439 440 /* Don't match clients that failed to initialise */ 441 if (!(clp->cl_cons_state == NFS_CS_READY || 442 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 443 return false; 444 445 /* Match the version and minorversion */ 446 if (clp->rpc_ops->version != 4 || 447 clp->cl_minorversion != minorversion) 448 return false; 449 450 /* Match only the IP address, not the port number */ 451 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 452 return false; 453 454 return true; 455 } 456 457 /* 458 * Find an nfs_client on the list that matches the initialisation data 459 * that is supplied. 460 */ 461 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 462 { 463 struct nfs_client *clp; 464 const struct sockaddr *sap = data->addr; 465 466 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 467 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 468 /* Don't match clients that failed to initialise properly */ 469 if (clp->cl_cons_state < 0) 470 continue; 471 472 /* Different NFS versions cannot share the same nfs_client */ 473 if (clp->rpc_ops != data->rpc_ops) 474 continue; 475 476 if (clp->cl_proto != data->proto) 477 continue; 478 /* Match nfsv4 minorversion */ 479 if (clp->cl_minorversion != data->minorversion) 480 continue; 481 /* Match the full socket address */ 482 if (!nfs_sockaddr_cmp(sap, clap)) 483 continue; 484 485 atomic_inc(&clp->cl_count); 486 return clp; 487 } 488 return NULL; 489 } 490 491 /* 492 * Look up a client by IP address and protocol version 493 * - creates a new record if one doesn't yet exist 494 */ 495 static struct nfs_client * 496 nfs_get_client(const struct nfs_client_initdata *cl_init, 497 const struct rpc_timeout *timeparms, 498 const char *ip_addr, 499 rpc_authflavor_t authflavour, 500 int noresvport) 501 { 502 struct nfs_client *clp, *new = NULL; 503 int error; 504 505 dprintk("--> nfs_get_client(%s,v%u)\n", 506 cl_init->hostname ?: "", cl_init->rpc_ops->version); 507 508 /* see if the client already exists */ 509 do { 510 spin_lock(&nfs_client_lock); 511 512 clp = nfs_match_client(cl_init); 513 if (clp) 514 goto found_client; 515 if (new) 516 goto install_client; 517 518 spin_unlock(&nfs_client_lock); 519 520 new = nfs_alloc_client(cl_init); 521 } while (!IS_ERR(new)); 522 523 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 524 return new; 525 526 /* install a new client and return with it unready */ 527 install_client: 528 clp = new; 529 list_add(&clp->cl_share_link, &nfs_client_list); 530 spin_unlock(&nfs_client_lock); 531 532 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, 533 authflavour, noresvport); 534 if (error < 0) { 535 nfs_put_client(clp); 536 return ERR_PTR(error); 537 } 538 dprintk("--> nfs_get_client() = %p [new]\n", clp); 539 return clp; 540 541 /* found an existing client 542 * - make sure it's ready before returning 543 */ 544 found_client: 545 spin_unlock(&nfs_client_lock); 546 547 if (new) 548 nfs_free_client(new); 549 550 error = wait_event_killable(nfs_client_active_wq, 551 clp->cl_cons_state < NFS_CS_INITING); 552 if (error < 0) { 553 nfs_put_client(clp); 554 return ERR_PTR(-ERESTARTSYS); 555 } 556 557 if (clp->cl_cons_state < NFS_CS_READY) { 558 error = clp->cl_cons_state; 559 nfs_put_client(clp); 560 return ERR_PTR(error); 561 } 562 563 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 564 565 dprintk("--> nfs_get_client() = %p [share]\n", clp); 566 return clp; 567 } 568 569 /* 570 * Mark a server as ready or failed 571 */ 572 void nfs_mark_client_ready(struct nfs_client *clp, int state) 573 { 574 clp->cl_cons_state = state; 575 wake_up_all(&nfs_client_active_wq); 576 } 577 578 /* 579 * With sessions, the client is not marked ready until after a 580 * successful EXCHANGE_ID and CREATE_SESSION. 581 * 582 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 583 * other versions of NFS can be tried. 584 */ 585 int nfs4_check_client_ready(struct nfs_client *clp) 586 { 587 if (!nfs4_has_session(clp)) 588 return 0; 589 if (clp->cl_cons_state < NFS_CS_READY) 590 return -EPROTONOSUPPORT; 591 return 0; 592 } 593 594 /* 595 * Initialise the timeout values for a connection 596 */ 597 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 598 unsigned int timeo, unsigned int retrans) 599 { 600 to->to_initval = timeo * HZ / 10; 601 to->to_retries = retrans; 602 603 switch (proto) { 604 case XPRT_TRANSPORT_TCP: 605 case XPRT_TRANSPORT_RDMA: 606 if (to->to_retries == 0) 607 to->to_retries = NFS_DEF_TCP_RETRANS; 608 if (to->to_initval == 0) 609 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 610 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 611 to->to_initval = NFS_MAX_TCP_TIMEOUT; 612 to->to_increment = to->to_initval; 613 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 614 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 615 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 616 if (to->to_maxval < to->to_initval) 617 to->to_maxval = to->to_initval; 618 to->to_exponential = 0; 619 break; 620 case XPRT_TRANSPORT_UDP: 621 if (to->to_retries == 0) 622 to->to_retries = NFS_DEF_UDP_RETRANS; 623 if (!to->to_initval) 624 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 625 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 626 to->to_initval = NFS_MAX_UDP_TIMEOUT; 627 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 628 to->to_exponential = 1; 629 break; 630 default: 631 BUG(); 632 } 633 } 634 635 /* 636 * Create an RPC client handle 637 */ 638 static int nfs_create_rpc_client(struct nfs_client *clp, 639 const struct rpc_timeout *timeparms, 640 rpc_authflavor_t flavor, 641 int discrtry, int noresvport) 642 { 643 struct rpc_clnt *clnt = NULL; 644 struct rpc_create_args args = { 645 .net = &init_net, 646 .protocol = clp->cl_proto, 647 .address = (struct sockaddr *)&clp->cl_addr, 648 .addrsize = clp->cl_addrlen, 649 .timeout = timeparms, 650 .servername = clp->cl_hostname, 651 .program = &nfs_program, 652 .version = clp->rpc_ops->version, 653 .authflavor = flavor, 654 }; 655 656 if (discrtry) 657 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 658 if (noresvport) 659 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 660 661 if (!IS_ERR(clp->cl_rpcclient)) 662 return 0; 663 664 clnt = rpc_create(&args); 665 if (IS_ERR(clnt)) { 666 dprintk("%s: cannot create RPC client. Error = %ld\n", 667 __func__, PTR_ERR(clnt)); 668 return PTR_ERR(clnt); 669 } 670 671 clp->cl_rpcclient = clnt; 672 return 0; 673 } 674 675 /* 676 * Version 2 or 3 client destruction 677 */ 678 static void nfs_destroy_server(struct nfs_server *server) 679 { 680 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 681 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 682 nlmclnt_done(server->nlm_host); 683 } 684 685 /* 686 * Version 2 or 3 lockd setup 687 */ 688 static int nfs_start_lockd(struct nfs_server *server) 689 { 690 struct nlm_host *host; 691 struct nfs_client *clp = server->nfs_client; 692 struct nlmclnt_initdata nlm_init = { 693 .hostname = clp->cl_hostname, 694 .address = (struct sockaddr *)&clp->cl_addr, 695 .addrlen = clp->cl_addrlen, 696 .nfs_version = clp->rpc_ops->version, 697 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 698 1 : 0, 699 }; 700 701 if (nlm_init.nfs_version > 3) 702 return 0; 703 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 704 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 705 return 0; 706 707 switch (clp->cl_proto) { 708 default: 709 nlm_init.protocol = IPPROTO_TCP; 710 break; 711 case XPRT_TRANSPORT_UDP: 712 nlm_init.protocol = IPPROTO_UDP; 713 } 714 715 host = nlmclnt_init(&nlm_init); 716 if (IS_ERR(host)) 717 return PTR_ERR(host); 718 719 server->nlm_host = host; 720 server->destroy = nfs_destroy_server; 721 return 0; 722 } 723 724 /* 725 * Initialise an NFSv3 ACL client connection 726 */ 727 #ifdef CONFIG_NFS_V3_ACL 728 static void nfs_init_server_aclclient(struct nfs_server *server) 729 { 730 if (server->nfs_client->rpc_ops->version != 3) 731 goto out_noacl; 732 if (server->flags & NFS_MOUNT_NOACL) 733 goto out_noacl; 734 735 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 736 if (IS_ERR(server->client_acl)) 737 goto out_noacl; 738 739 /* No errors! Assume that Sun nfsacls are supported */ 740 server->caps |= NFS_CAP_ACLS; 741 return; 742 743 out_noacl: 744 server->caps &= ~NFS_CAP_ACLS; 745 } 746 #else 747 static inline void nfs_init_server_aclclient(struct nfs_server *server) 748 { 749 server->flags &= ~NFS_MOUNT_NOACL; 750 server->caps &= ~NFS_CAP_ACLS; 751 } 752 #endif 753 754 /* 755 * Create a general RPC client 756 */ 757 static int nfs_init_server_rpcclient(struct nfs_server *server, 758 const struct rpc_timeout *timeo, 759 rpc_authflavor_t pseudoflavour) 760 { 761 struct nfs_client *clp = server->nfs_client; 762 763 server->client = rpc_clone_client(clp->cl_rpcclient); 764 if (IS_ERR(server->client)) { 765 dprintk("%s: couldn't create rpc_client!\n", __func__); 766 return PTR_ERR(server->client); 767 } 768 769 memcpy(&server->client->cl_timeout_default, 770 timeo, 771 sizeof(server->client->cl_timeout_default)); 772 server->client->cl_timeout = &server->client->cl_timeout_default; 773 774 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 775 struct rpc_auth *auth; 776 777 auth = rpcauth_create(pseudoflavour, server->client); 778 if (IS_ERR(auth)) { 779 dprintk("%s: couldn't create credcache!\n", __func__); 780 return PTR_ERR(auth); 781 } 782 } 783 server->client->cl_softrtry = 0; 784 if (server->flags & NFS_MOUNT_SOFT) 785 server->client->cl_softrtry = 1; 786 787 return 0; 788 } 789 790 /* 791 * Initialise an NFS2 or NFS3 client 792 */ 793 int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, 794 const char *ip_addr, rpc_authflavor_t authflavour, 795 int noresvport) 796 { 797 int error; 798 799 if (clp->cl_cons_state == NFS_CS_READY) { 800 /* the client is already initialised */ 801 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 802 return 0; 803 } 804 805 /* 806 * Create a client RPC handle for doing FSSTAT with UNIX auth only 807 * - RFC 2623, sec 2.3.2 808 */ 809 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 810 0, noresvport); 811 if (error < 0) 812 goto error; 813 nfs_mark_client_ready(clp, NFS_CS_READY); 814 return 0; 815 816 error: 817 nfs_mark_client_ready(clp, error); 818 dprintk("<-- nfs_init_client() = xerror %d\n", error); 819 return error; 820 } 821 822 /* 823 * Create a version 2 or 3 client 824 */ 825 static int nfs_init_server(struct nfs_server *server, 826 const struct nfs_parsed_mount_data *data) 827 { 828 struct nfs_client_initdata cl_init = { 829 .hostname = data->nfs_server.hostname, 830 .addr = (const struct sockaddr *)&data->nfs_server.address, 831 .addrlen = data->nfs_server.addrlen, 832 .rpc_ops = &nfs_v2_clientops, 833 .proto = data->nfs_server.protocol, 834 }; 835 struct rpc_timeout timeparms; 836 struct nfs_client *clp; 837 int error; 838 839 dprintk("--> nfs_init_server()\n"); 840 841 #ifdef CONFIG_NFS_V3 842 if (data->version == 3) 843 cl_init.rpc_ops = &nfs_v3_clientops; 844 #endif 845 846 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 847 data->timeo, data->retrans); 848 849 /* Allocate or find a client reference we can use */ 850 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, 851 data->flags & NFS_MOUNT_NORESVPORT); 852 if (IS_ERR(clp)) { 853 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 854 return PTR_ERR(clp); 855 } 856 857 server->nfs_client = clp; 858 859 /* Initialise the client representation from the mount data */ 860 server->flags = data->flags; 861 server->options = data->options; 862 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 863 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 864 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 865 866 if (data->rsize) 867 server->rsize = nfs_block_size(data->rsize, NULL); 868 if (data->wsize) 869 server->wsize = nfs_block_size(data->wsize, NULL); 870 871 server->acregmin = data->acregmin * HZ; 872 server->acregmax = data->acregmax * HZ; 873 server->acdirmin = data->acdirmin * HZ; 874 server->acdirmax = data->acdirmax * HZ; 875 876 /* Start lockd here, before we might error out */ 877 error = nfs_start_lockd(server); 878 if (error < 0) 879 goto error; 880 881 server->port = data->nfs_server.port; 882 883 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 884 if (error < 0) 885 goto error; 886 887 /* Preserve the values of mount_server-related mount options */ 888 if (data->mount_server.addrlen) { 889 memcpy(&server->mountd_address, &data->mount_server.address, 890 data->mount_server.addrlen); 891 server->mountd_addrlen = data->mount_server.addrlen; 892 } 893 server->mountd_version = data->mount_server.version; 894 server->mountd_port = data->mount_server.port; 895 server->mountd_protocol = data->mount_server.protocol; 896 897 server->namelen = data->namlen; 898 /* Create a client RPC handle for the NFSv3 ACL management interface */ 899 nfs_init_server_aclclient(server); 900 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 901 return 0; 902 903 error: 904 server->nfs_client = NULL; 905 nfs_put_client(clp); 906 dprintk("<-- nfs_init_server() = xerror %d\n", error); 907 return error; 908 } 909 910 /* 911 * Load up the server record from information gained in an fsinfo record 912 */ 913 static void nfs_server_set_fsinfo(struct nfs_server *server, 914 struct nfs_fh *mntfh, 915 struct nfs_fsinfo *fsinfo) 916 { 917 unsigned long max_rpc_payload; 918 919 /* Work out a lot of parameters */ 920 if (server->rsize == 0) 921 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 922 if (server->wsize == 0) 923 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 924 925 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 926 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 927 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 928 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 929 930 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 931 if (server->rsize > max_rpc_payload) 932 server->rsize = max_rpc_payload; 933 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 934 server->rsize = NFS_MAX_FILE_IO_SIZE; 935 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 936 937 server->backing_dev_info.name = "nfs"; 938 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 939 940 if (server->wsize > max_rpc_payload) 941 server->wsize = max_rpc_payload; 942 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 943 server->wsize = NFS_MAX_FILE_IO_SIZE; 944 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 945 server->pnfs_blksize = fsinfo->blksize; 946 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype); 947 948 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 949 950 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 951 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 952 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 953 if (server->dtsize > server->rsize) 954 server->dtsize = server->rsize; 955 956 if (server->flags & NFS_MOUNT_NOAC) { 957 server->acregmin = server->acregmax = 0; 958 server->acdirmin = server->acdirmax = 0; 959 } 960 961 server->maxfilesize = fsinfo->maxfilesize; 962 963 server->time_delta = fsinfo->time_delta; 964 965 /* We're airborne Set socket buffersize */ 966 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 967 } 968 969 /* 970 * Probe filesystem information, including the FSID on v2/v3 971 */ 972 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 973 { 974 struct nfs_fsinfo fsinfo; 975 struct nfs_client *clp = server->nfs_client; 976 int error; 977 978 dprintk("--> nfs_probe_fsinfo()\n"); 979 980 if (clp->rpc_ops->set_capabilities != NULL) { 981 error = clp->rpc_ops->set_capabilities(server, mntfh); 982 if (error < 0) 983 goto out_error; 984 } 985 986 fsinfo.fattr = fattr; 987 fsinfo.layouttype = 0; 988 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 989 if (error < 0) 990 goto out_error; 991 992 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 993 994 /* Get some general file system info */ 995 if (server->namelen == 0) { 996 struct nfs_pathconf pathinfo; 997 998 pathinfo.fattr = fattr; 999 nfs_fattr_init(fattr); 1000 1001 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 1002 server->namelen = pathinfo.max_namelen; 1003 } 1004 1005 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 1006 return 0; 1007 1008 out_error: 1009 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1010 return error; 1011 } 1012 1013 /* 1014 * Copy useful information when duplicating a server record 1015 */ 1016 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1017 { 1018 target->flags = source->flags; 1019 target->rsize = source->rsize; 1020 target->wsize = source->wsize; 1021 target->acregmin = source->acregmin; 1022 target->acregmax = source->acregmax; 1023 target->acdirmin = source->acdirmin; 1024 target->acdirmax = source->acdirmax; 1025 target->caps = source->caps; 1026 target->options = source->options; 1027 } 1028 1029 static void nfs_server_insert_lists(struct nfs_server *server) 1030 { 1031 struct nfs_client *clp = server->nfs_client; 1032 1033 spin_lock(&nfs_client_lock); 1034 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1035 list_add_tail(&server->master_link, &nfs_volume_list); 1036 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1037 spin_unlock(&nfs_client_lock); 1038 1039 } 1040 1041 static void nfs_server_remove_lists(struct nfs_server *server) 1042 { 1043 struct nfs_client *clp = server->nfs_client; 1044 1045 spin_lock(&nfs_client_lock); 1046 list_del_rcu(&server->client_link); 1047 if (clp && list_empty(&clp->cl_superblocks)) 1048 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1049 list_del(&server->master_link); 1050 spin_unlock(&nfs_client_lock); 1051 1052 synchronize_rcu(); 1053 } 1054 1055 /* 1056 * Allocate and initialise a server record 1057 */ 1058 static struct nfs_server *nfs_alloc_server(void) 1059 { 1060 struct nfs_server *server; 1061 1062 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1063 if (!server) 1064 return NULL; 1065 1066 server->client = server->client_acl = ERR_PTR(-EINVAL); 1067 1068 /* Zero out the NFS state stuff */ 1069 INIT_LIST_HEAD(&server->client_link); 1070 INIT_LIST_HEAD(&server->master_link); 1071 INIT_LIST_HEAD(&server->delegations); 1072 INIT_LIST_HEAD(&server->layouts); 1073 INIT_LIST_HEAD(&server->state_owners_lru); 1074 1075 atomic_set(&server->active, 0); 1076 1077 server->io_stats = nfs_alloc_iostats(); 1078 if (!server->io_stats) { 1079 kfree(server); 1080 return NULL; 1081 } 1082 1083 if (bdi_init(&server->backing_dev_info)) { 1084 nfs_free_iostats(server->io_stats); 1085 kfree(server); 1086 return NULL; 1087 } 1088 1089 pnfs_init_server(server); 1090 1091 return server; 1092 } 1093 1094 /* 1095 * Free up a server record 1096 */ 1097 void nfs_free_server(struct nfs_server *server) 1098 { 1099 dprintk("--> nfs_free_server()\n"); 1100 1101 nfs_server_remove_lists(server); 1102 unset_pnfs_layoutdriver(server); 1103 1104 if (server->destroy != NULL) 1105 server->destroy(server); 1106 1107 if (!IS_ERR(server->client_acl)) 1108 rpc_shutdown_client(server->client_acl); 1109 if (!IS_ERR(server->client)) 1110 rpc_shutdown_client(server->client); 1111 1112 nfs_put_client(server->nfs_client); 1113 1114 nfs_free_iostats(server->io_stats); 1115 bdi_destroy(&server->backing_dev_info); 1116 kfree(server); 1117 nfs_release_automount_timer(); 1118 dprintk("<-- nfs_free_server()\n"); 1119 } 1120 1121 /* 1122 * Create a version 2 or 3 volume record 1123 * - keyed on server and FSID 1124 */ 1125 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1126 struct nfs_fh *mntfh) 1127 { 1128 struct nfs_server *server; 1129 struct nfs_fattr *fattr; 1130 int error; 1131 1132 server = nfs_alloc_server(); 1133 if (!server) 1134 return ERR_PTR(-ENOMEM); 1135 1136 error = -ENOMEM; 1137 fattr = nfs_alloc_fattr(); 1138 if (fattr == NULL) 1139 goto error; 1140 1141 /* Get a client representation */ 1142 error = nfs_init_server(server, data); 1143 if (error < 0) 1144 goto error; 1145 1146 BUG_ON(!server->nfs_client); 1147 BUG_ON(!server->nfs_client->rpc_ops); 1148 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1149 1150 /* Probe the root fh to retrieve its FSID */ 1151 error = nfs_probe_fsinfo(server, mntfh, fattr); 1152 if (error < 0) 1153 goto error; 1154 if (server->nfs_client->rpc_ops->version == 3) { 1155 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1156 server->namelen = NFS3_MAXNAMLEN; 1157 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1158 server->caps |= NFS_CAP_READDIRPLUS; 1159 } else { 1160 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1161 server->namelen = NFS2_MAXNAMLEN; 1162 } 1163 1164 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1165 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1166 if (error < 0) { 1167 dprintk("nfs_create_server: getattr error = %d\n", -error); 1168 goto error; 1169 } 1170 } 1171 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1172 1173 dprintk("Server FSID: %llx:%llx\n", 1174 (unsigned long long) server->fsid.major, 1175 (unsigned long long) server->fsid.minor); 1176 1177 nfs_server_insert_lists(server); 1178 server->mount_time = jiffies; 1179 nfs_free_fattr(fattr); 1180 return server; 1181 1182 error: 1183 nfs_free_fattr(fattr); 1184 nfs_free_server(server); 1185 return ERR_PTR(error); 1186 } 1187 1188 #ifdef CONFIG_NFS_V4 1189 /* 1190 * NFSv4.0 callback thread helper 1191 * 1192 * Find a client by IP address, protocol version, and minorversion 1193 * 1194 * Called from the pg_authenticate method. The callback identifier 1195 * is not used as it has not been decoded. 1196 * 1197 * Returns NULL if no such client 1198 */ 1199 struct nfs_client * 1200 nfs4_find_client_no_ident(const struct sockaddr *addr) 1201 { 1202 struct nfs_client *clp; 1203 1204 spin_lock(&nfs_client_lock); 1205 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1206 if (nfs4_cb_match_client(addr, clp, 0) == false) 1207 continue; 1208 atomic_inc(&clp->cl_count); 1209 spin_unlock(&nfs_client_lock); 1210 return clp; 1211 } 1212 spin_unlock(&nfs_client_lock); 1213 return NULL; 1214 } 1215 1216 /* 1217 * NFSv4.0 callback thread helper 1218 * 1219 * Find a client by callback identifier 1220 */ 1221 struct nfs_client * 1222 nfs4_find_client_ident(int cb_ident) 1223 { 1224 struct nfs_client *clp; 1225 1226 spin_lock(&nfs_client_lock); 1227 clp = idr_find(&cb_ident_idr, cb_ident); 1228 if (clp) 1229 atomic_inc(&clp->cl_count); 1230 spin_unlock(&nfs_client_lock); 1231 return clp; 1232 } 1233 1234 #if defined(CONFIG_NFS_V4_1) 1235 /* 1236 * NFSv4.1 callback thread helper 1237 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1238 * minorversion, and sessionID 1239 * 1240 * Returns NULL if no such client 1241 */ 1242 struct nfs_client * 1243 nfs4_find_client_sessionid(const struct sockaddr *addr, 1244 struct nfs4_sessionid *sid) 1245 { 1246 struct nfs_client *clp; 1247 1248 spin_lock(&nfs_client_lock); 1249 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1250 if (nfs4_cb_match_client(addr, clp, 1) == false) 1251 continue; 1252 1253 if (!nfs4_has_session(clp)) 1254 continue; 1255 1256 /* Match sessionid*/ 1257 if (memcmp(clp->cl_session->sess_id.data, 1258 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1259 continue; 1260 1261 atomic_inc(&clp->cl_count); 1262 spin_unlock(&nfs_client_lock); 1263 return clp; 1264 } 1265 spin_unlock(&nfs_client_lock); 1266 return NULL; 1267 } 1268 1269 #else /* CONFIG_NFS_V4_1 */ 1270 1271 struct nfs_client * 1272 nfs4_find_client_sessionid(const struct sockaddr *addr, 1273 struct nfs4_sessionid *sid) 1274 { 1275 return NULL; 1276 } 1277 #endif /* CONFIG_NFS_V4_1 */ 1278 1279 /* 1280 * Initialize the NFS4 callback service 1281 */ 1282 static int nfs4_init_callback(struct nfs_client *clp) 1283 { 1284 int error; 1285 1286 if (clp->rpc_ops->version == 4) { 1287 if (nfs4_has_session(clp)) { 1288 error = xprt_setup_backchannel( 1289 clp->cl_rpcclient->cl_xprt, 1290 NFS41_BC_MIN_CALLBACKS); 1291 if (error < 0) 1292 return error; 1293 } 1294 1295 error = nfs_callback_up(clp->cl_mvops->minor_version, 1296 clp->cl_rpcclient->cl_xprt); 1297 if (error < 0) { 1298 dprintk("%s: failed to start callback. Error = %d\n", 1299 __func__, error); 1300 return error; 1301 } 1302 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1303 } 1304 return 0; 1305 } 1306 1307 /* 1308 * Initialize the minor version specific parts of an NFS4 client record 1309 */ 1310 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1311 { 1312 #if defined(CONFIG_NFS_V4_1) 1313 if (clp->cl_mvops->minor_version) { 1314 struct nfs4_session *session = NULL; 1315 /* 1316 * Create the session and mark it expired. 1317 * When a SEQUENCE operation encounters the expired session 1318 * it will do session recovery to initialize it. 1319 */ 1320 session = nfs4_alloc_session(clp); 1321 if (!session) 1322 return -ENOMEM; 1323 1324 clp->cl_session = session; 1325 /* 1326 * The create session reply races with the server back 1327 * channel probe. Mark the client NFS_CS_SESSION_INITING 1328 * so that the client back channel can find the 1329 * nfs_client struct 1330 */ 1331 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1332 } 1333 #endif /* CONFIG_NFS_V4_1 */ 1334 1335 return nfs4_init_callback(clp); 1336 } 1337 1338 /* 1339 * Initialise an NFS4 client record 1340 */ 1341 int nfs4_init_client(struct nfs_client *clp, 1342 const struct rpc_timeout *timeparms, 1343 const char *ip_addr, 1344 rpc_authflavor_t authflavour, 1345 int noresvport) 1346 { 1347 int error; 1348 1349 if (clp->cl_cons_state == NFS_CS_READY) { 1350 /* the client is initialised already */ 1351 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1352 return 0; 1353 } 1354 1355 /* Check NFS protocol revision and initialize RPC op vector */ 1356 clp->rpc_ops = &nfs_v4_clientops; 1357 1358 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1359 1, noresvport); 1360 if (error < 0) 1361 goto error; 1362 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1363 1364 error = nfs_idmap_new(clp); 1365 if (error < 0) { 1366 dprintk("%s: failed to create idmapper. Error = %d\n", 1367 __func__, error); 1368 goto error; 1369 } 1370 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1371 1372 error = nfs4_init_client_minor_version(clp); 1373 if (error < 0) 1374 goto error; 1375 1376 if (!nfs4_has_session(clp)) 1377 nfs_mark_client_ready(clp, NFS_CS_READY); 1378 return 0; 1379 1380 error: 1381 nfs_mark_client_ready(clp, error); 1382 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1383 return error; 1384 } 1385 1386 /* 1387 * Set up an NFS4 client 1388 */ 1389 static int nfs4_set_client(struct nfs_server *server, 1390 const char *hostname, 1391 const struct sockaddr *addr, 1392 const size_t addrlen, 1393 const char *ip_addr, 1394 rpc_authflavor_t authflavour, 1395 int proto, const struct rpc_timeout *timeparms, 1396 u32 minorversion) 1397 { 1398 struct nfs_client_initdata cl_init = { 1399 .hostname = hostname, 1400 .addr = addr, 1401 .addrlen = addrlen, 1402 .rpc_ops = &nfs_v4_clientops, 1403 .proto = proto, 1404 .minorversion = minorversion, 1405 }; 1406 struct nfs_client *clp; 1407 int error; 1408 1409 dprintk("--> nfs4_set_client()\n"); 1410 1411 /* Allocate or find a client reference we can use */ 1412 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1413 server->flags & NFS_MOUNT_NORESVPORT); 1414 if (IS_ERR(clp)) { 1415 error = PTR_ERR(clp); 1416 goto error; 1417 } 1418 1419 /* 1420 * Query for the lease time on clientid setup or renewal 1421 * 1422 * Note that this will be set on nfs_clients that were created 1423 * only for the DS role and did not set this bit, but now will 1424 * serve a dual role. 1425 */ 1426 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1427 1428 server->nfs_client = clp; 1429 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1430 return 0; 1431 error: 1432 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1433 return error; 1434 } 1435 1436 /* 1437 * Set up a pNFS Data Server client. 1438 * 1439 * Return any existing nfs_client that matches server address,port,version 1440 * and minorversion. 1441 * 1442 * For a new nfs_client, use a soft mount (default), a low retrans and a 1443 * low timeout interval so that if a connection is lost, we retry through 1444 * the MDS. 1445 */ 1446 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1447 const struct sockaddr *ds_addr, 1448 int ds_addrlen, int ds_proto) 1449 { 1450 struct nfs_client_initdata cl_init = { 1451 .addr = ds_addr, 1452 .addrlen = ds_addrlen, 1453 .rpc_ops = &nfs_v4_clientops, 1454 .proto = ds_proto, 1455 .minorversion = mds_clp->cl_minorversion, 1456 }; 1457 struct rpc_timeout ds_timeout = { 1458 .to_initval = 15 * HZ, 1459 .to_maxval = 15 * HZ, 1460 .to_retries = 1, 1461 .to_exponential = 1, 1462 }; 1463 struct nfs_client *clp; 1464 1465 /* 1466 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1467 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1468 * (section 13.1 RFC 5661). 1469 */ 1470 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1471 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1472 1473 dprintk("<-- %s %p\n", __func__, clp); 1474 return clp; 1475 } 1476 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1477 1478 /* 1479 * Session has been established, and the client marked ready. 1480 * Set the mount rsize and wsize with negotiated fore channel 1481 * attributes which will be bound checked in nfs_server_set_fsinfo. 1482 */ 1483 static void nfs4_session_set_rwsize(struct nfs_server *server) 1484 { 1485 #ifdef CONFIG_NFS_V4_1 1486 struct nfs4_session *sess; 1487 u32 server_resp_sz; 1488 u32 server_rqst_sz; 1489 1490 if (!nfs4_has_session(server->nfs_client)) 1491 return; 1492 sess = server->nfs_client->cl_session; 1493 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1494 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1495 1496 if (server->rsize > server_resp_sz) 1497 server->rsize = server_resp_sz; 1498 if (server->wsize > server_rqst_sz) 1499 server->wsize = server_rqst_sz; 1500 #endif /* CONFIG_NFS_V4_1 */ 1501 } 1502 1503 static int nfs4_server_common_setup(struct nfs_server *server, 1504 struct nfs_fh *mntfh) 1505 { 1506 struct nfs_fattr *fattr; 1507 int error; 1508 1509 BUG_ON(!server->nfs_client); 1510 BUG_ON(!server->nfs_client->rpc_ops); 1511 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1512 1513 /* data servers support only a subset of NFSv4.1 */ 1514 if (is_ds_only_client(server->nfs_client)) 1515 return -EPROTONOSUPPORT; 1516 1517 fattr = nfs_alloc_fattr(); 1518 if (fattr == NULL) 1519 return -ENOMEM; 1520 1521 /* We must ensure the session is initialised first */ 1522 error = nfs4_init_session(server); 1523 if (error < 0) 1524 goto out; 1525 1526 /* Probe the root fh to retrieve its FSID and filehandle */ 1527 error = nfs4_get_rootfh(server, mntfh); 1528 if (error < 0) 1529 goto out; 1530 1531 dprintk("Server FSID: %llx:%llx\n", 1532 (unsigned long long) server->fsid.major, 1533 (unsigned long long) server->fsid.minor); 1534 dprintk("Mount FH: %d\n", mntfh->size); 1535 1536 nfs4_session_set_rwsize(server); 1537 1538 error = nfs_probe_fsinfo(server, mntfh, fattr); 1539 if (error < 0) 1540 goto out; 1541 1542 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1543 server->namelen = NFS4_MAXNAMLEN; 1544 1545 nfs_server_insert_lists(server); 1546 server->mount_time = jiffies; 1547 server->destroy = nfs4_destroy_server; 1548 out: 1549 nfs_free_fattr(fattr); 1550 return error; 1551 } 1552 1553 /* 1554 * Create a version 4 volume record 1555 */ 1556 static int nfs4_init_server(struct nfs_server *server, 1557 const struct nfs_parsed_mount_data *data) 1558 { 1559 struct rpc_timeout timeparms; 1560 int error; 1561 1562 dprintk("--> nfs4_init_server()\n"); 1563 1564 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1565 data->timeo, data->retrans); 1566 1567 /* Initialise the client representation from the mount data */ 1568 server->flags = data->flags; 1569 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1570 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1571 server->caps |= NFS_CAP_READDIRPLUS; 1572 server->options = data->options; 1573 1574 /* Get a client record */ 1575 error = nfs4_set_client(server, 1576 data->nfs_server.hostname, 1577 (const struct sockaddr *)&data->nfs_server.address, 1578 data->nfs_server.addrlen, 1579 data->client_address, 1580 data->auth_flavors[0], 1581 data->nfs_server.protocol, 1582 &timeparms, 1583 data->minorversion); 1584 if (error < 0) 1585 goto error; 1586 1587 /* 1588 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1589 * authentication. 1590 */ 1591 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1592 server->caps |= NFS_CAP_UIDGID_NOMAP; 1593 1594 if (data->rsize) 1595 server->rsize = nfs_block_size(data->rsize, NULL); 1596 if (data->wsize) 1597 server->wsize = nfs_block_size(data->wsize, NULL); 1598 1599 server->acregmin = data->acregmin * HZ; 1600 server->acregmax = data->acregmax * HZ; 1601 server->acdirmin = data->acdirmin * HZ; 1602 server->acdirmax = data->acdirmax * HZ; 1603 1604 server->port = data->nfs_server.port; 1605 1606 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1607 1608 error: 1609 /* Done */ 1610 dprintk("<-- nfs4_init_server() = %d\n", error); 1611 return error; 1612 } 1613 1614 /* 1615 * Create a version 4 volume record 1616 * - keyed on server and FSID 1617 */ 1618 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1619 struct nfs_fh *mntfh) 1620 { 1621 struct nfs_server *server; 1622 int error; 1623 1624 dprintk("--> nfs4_create_server()\n"); 1625 1626 server = nfs_alloc_server(); 1627 if (!server) 1628 return ERR_PTR(-ENOMEM); 1629 1630 /* set up the general RPC client */ 1631 error = nfs4_init_server(server, data); 1632 if (error < 0) 1633 goto error; 1634 1635 error = nfs4_server_common_setup(server, mntfh); 1636 if (error < 0) 1637 goto error; 1638 1639 dprintk("<-- nfs4_create_server() = %p\n", server); 1640 return server; 1641 1642 error: 1643 nfs_free_server(server); 1644 dprintk("<-- nfs4_create_server() = error %d\n", error); 1645 return ERR_PTR(error); 1646 } 1647 1648 /* 1649 * Create an NFS4 referral server record 1650 */ 1651 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1652 struct nfs_fh *mntfh) 1653 { 1654 struct nfs_client *parent_client; 1655 struct nfs_server *server, *parent_server; 1656 int error; 1657 1658 dprintk("--> nfs4_create_referral_server()\n"); 1659 1660 server = nfs_alloc_server(); 1661 if (!server) 1662 return ERR_PTR(-ENOMEM); 1663 1664 parent_server = NFS_SB(data->sb); 1665 parent_client = parent_server->nfs_client; 1666 1667 /* Initialise the client representation from the parent server */ 1668 nfs_server_copy_userdata(server, parent_server); 1669 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1670 1671 /* Get a client representation. 1672 * Note: NFSv4 always uses TCP, */ 1673 error = nfs4_set_client(server, data->hostname, 1674 data->addr, 1675 data->addrlen, 1676 parent_client->cl_ipaddr, 1677 data->authflavor, 1678 parent_server->client->cl_xprt->prot, 1679 parent_server->client->cl_timeout, 1680 parent_client->cl_mvops->minor_version); 1681 if (error < 0) 1682 goto error; 1683 1684 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1685 if (error < 0) 1686 goto error; 1687 1688 error = nfs4_server_common_setup(server, mntfh); 1689 if (error < 0) 1690 goto error; 1691 1692 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1693 return server; 1694 1695 error: 1696 nfs_free_server(server); 1697 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1698 return ERR_PTR(error); 1699 } 1700 1701 #endif /* CONFIG_NFS_V4 */ 1702 1703 /* 1704 * Clone an NFS2, NFS3 or NFS4 server record 1705 */ 1706 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1707 struct nfs_fh *fh, 1708 struct nfs_fattr *fattr) 1709 { 1710 struct nfs_server *server; 1711 struct nfs_fattr *fattr_fsinfo; 1712 int error; 1713 1714 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1715 (unsigned long long) fattr->fsid.major, 1716 (unsigned long long) fattr->fsid.minor); 1717 1718 server = nfs_alloc_server(); 1719 if (!server) 1720 return ERR_PTR(-ENOMEM); 1721 1722 error = -ENOMEM; 1723 fattr_fsinfo = nfs_alloc_fattr(); 1724 if (fattr_fsinfo == NULL) 1725 goto out_free_server; 1726 1727 /* Copy data from the source */ 1728 server->nfs_client = source->nfs_client; 1729 server->destroy = source->destroy; 1730 atomic_inc(&server->nfs_client->cl_count); 1731 nfs_server_copy_userdata(server, source); 1732 1733 server->fsid = fattr->fsid; 1734 1735 error = nfs_init_server_rpcclient(server, 1736 source->client->cl_timeout, 1737 source->client->cl_auth->au_flavor); 1738 if (error < 0) 1739 goto out_free_server; 1740 if (!IS_ERR(source->client_acl)) 1741 nfs_init_server_aclclient(server); 1742 1743 /* probe the filesystem info for this server filesystem */ 1744 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1745 if (error < 0) 1746 goto out_free_server; 1747 1748 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1749 server->namelen = NFS4_MAXNAMLEN; 1750 1751 dprintk("Cloned FSID: %llx:%llx\n", 1752 (unsigned long long) server->fsid.major, 1753 (unsigned long long) server->fsid.minor); 1754 1755 error = nfs_start_lockd(server); 1756 if (error < 0) 1757 goto out_free_server; 1758 1759 nfs_server_insert_lists(server); 1760 server->mount_time = jiffies; 1761 1762 nfs_free_fattr(fattr_fsinfo); 1763 dprintk("<-- nfs_clone_server() = %p\n", server); 1764 return server; 1765 1766 out_free_server: 1767 nfs_free_fattr(fattr_fsinfo); 1768 nfs_free_server(server); 1769 dprintk("<-- nfs_clone_server() = error %d\n", error); 1770 return ERR_PTR(error); 1771 } 1772 1773 #ifdef CONFIG_PROC_FS 1774 static struct proc_dir_entry *proc_fs_nfs; 1775 1776 static int nfs_server_list_open(struct inode *inode, struct file *file); 1777 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1778 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1779 static void nfs_server_list_stop(struct seq_file *p, void *v); 1780 static int nfs_server_list_show(struct seq_file *m, void *v); 1781 1782 static const struct seq_operations nfs_server_list_ops = { 1783 .start = nfs_server_list_start, 1784 .next = nfs_server_list_next, 1785 .stop = nfs_server_list_stop, 1786 .show = nfs_server_list_show, 1787 }; 1788 1789 static const struct file_operations nfs_server_list_fops = { 1790 .open = nfs_server_list_open, 1791 .read = seq_read, 1792 .llseek = seq_lseek, 1793 .release = seq_release, 1794 .owner = THIS_MODULE, 1795 }; 1796 1797 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1798 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1799 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1800 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1801 static int nfs_volume_list_show(struct seq_file *m, void *v); 1802 1803 static const struct seq_operations nfs_volume_list_ops = { 1804 .start = nfs_volume_list_start, 1805 .next = nfs_volume_list_next, 1806 .stop = nfs_volume_list_stop, 1807 .show = nfs_volume_list_show, 1808 }; 1809 1810 static const struct file_operations nfs_volume_list_fops = { 1811 .open = nfs_volume_list_open, 1812 .read = seq_read, 1813 .llseek = seq_lseek, 1814 .release = seq_release, 1815 .owner = THIS_MODULE, 1816 }; 1817 1818 /* 1819 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1820 * we're dealing 1821 */ 1822 static int nfs_server_list_open(struct inode *inode, struct file *file) 1823 { 1824 struct seq_file *m; 1825 int ret; 1826 1827 ret = seq_open(file, &nfs_server_list_ops); 1828 if (ret < 0) 1829 return ret; 1830 1831 m = file->private_data; 1832 m->private = PDE(inode)->data; 1833 1834 return 0; 1835 } 1836 1837 /* 1838 * set up the iterator to start reading from the server list and return the first item 1839 */ 1840 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1841 { 1842 /* lock the list against modification */ 1843 spin_lock(&nfs_client_lock); 1844 return seq_list_start_head(&nfs_client_list, *_pos); 1845 } 1846 1847 /* 1848 * move to next server 1849 */ 1850 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1851 { 1852 return seq_list_next(v, &nfs_client_list, pos); 1853 } 1854 1855 /* 1856 * clean up after reading from the transports list 1857 */ 1858 static void nfs_server_list_stop(struct seq_file *p, void *v) 1859 { 1860 spin_unlock(&nfs_client_lock); 1861 } 1862 1863 /* 1864 * display a header line followed by a load of call lines 1865 */ 1866 static int nfs_server_list_show(struct seq_file *m, void *v) 1867 { 1868 struct nfs_client *clp; 1869 1870 /* display header on line 1 */ 1871 if (v == &nfs_client_list) { 1872 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1873 return 0; 1874 } 1875 1876 /* display one transport per line on subsequent lines */ 1877 clp = list_entry(v, struct nfs_client, cl_share_link); 1878 1879 /* Check if the client is initialized */ 1880 if (clp->cl_cons_state != NFS_CS_READY) 1881 return 0; 1882 1883 seq_printf(m, "v%u %s %s %3d %s\n", 1884 clp->rpc_ops->version, 1885 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1886 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1887 atomic_read(&clp->cl_count), 1888 clp->cl_hostname); 1889 1890 return 0; 1891 } 1892 1893 /* 1894 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1895 */ 1896 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1897 { 1898 struct seq_file *m; 1899 int ret; 1900 1901 ret = seq_open(file, &nfs_volume_list_ops); 1902 if (ret < 0) 1903 return ret; 1904 1905 m = file->private_data; 1906 m->private = PDE(inode)->data; 1907 1908 return 0; 1909 } 1910 1911 /* 1912 * set up the iterator to start reading from the volume list and return the first item 1913 */ 1914 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1915 { 1916 /* lock the list against modification */ 1917 spin_lock(&nfs_client_lock); 1918 return seq_list_start_head(&nfs_volume_list, *_pos); 1919 } 1920 1921 /* 1922 * move to next volume 1923 */ 1924 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1925 { 1926 return seq_list_next(v, &nfs_volume_list, pos); 1927 } 1928 1929 /* 1930 * clean up after reading from the transports list 1931 */ 1932 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1933 { 1934 spin_unlock(&nfs_client_lock); 1935 } 1936 1937 /* 1938 * display a header line followed by a load of call lines 1939 */ 1940 static int nfs_volume_list_show(struct seq_file *m, void *v) 1941 { 1942 struct nfs_server *server; 1943 struct nfs_client *clp; 1944 char dev[8], fsid[17]; 1945 1946 /* display header on line 1 */ 1947 if (v == &nfs_volume_list) { 1948 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1949 return 0; 1950 } 1951 /* display one transport per line on subsequent lines */ 1952 server = list_entry(v, struct nfs_server, master_link); 1953 clp = server->nfs_client; 1954 1955 snprintf(dev, 8, "%u:%u", 1956 MAJOR(server->s_dev), MINOR(server->s_dev)); 1957 1958 snprintf(fsid, 17, "%llx:%llx", 1959 (unsigned long long) server->fsid.major, 1960 (unsigned long long) server->fsid.minor); 1961 1962 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1963 clp->rpc_ops->version, 1964 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1965 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1966 dev, 1967 fsid, 1968 nfs_server_fscache_state(server)); 1969 1970 return 0; 1971 } 1972 1973 /* 1974 * initialise the /proc/fs/nfsfs/ directory 1975 */ 1976 int __init nfs_fs_proc_init(void) 1977 { 1978 struct proc_dir_entry *p; 1979 1980 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1981 if (!proc_fs_nfs) 1982 goto error_0; 1983 1984 /* a file of servers with which we're dealing */ 1985 p = proc_create("servers", S_IFREG|S_IRUGO, 1986 proc_fs_nfs, &nfs_server_list_fops); 1987 if (!p) 1988 goto error_1; 1989 1990 /* a file of volumes that we have mounted */ 1991 p = proc_create("volumes", S_IFREG|S_IRUGO, 1992 proc_fs_nfs, &nfs_volume_list_fops); 1993 if (!p) 1994 goto error_2; 1995 return 0; 1996 1997 error_2: 1998 remove_proc_entry("servers", proc_fs_nfs); 1999 error_1: 2000 remove_proc_entry("fs/nfsfs", NULL); 2001 error_0: 2002 return -ENOMEM; 2003 } 2004 2005 /* 2006 * clean up the /proc/fs/nfsfs/ directory 2007 */ 2008 void nfs_fs_proc_exit(void) 2009 { 2010 remove_proc_entry("volumes", proc_fs_nfs); 2011 remove_proc_entry("servers", proc_fs_nfs); 2012 remove_proc_entry("fs/nfsfs", NULL); 2013 } 2014 2015 #endif /* CONFIG_PROC_FS */ 2016 2017 module_param(nfs4_disable_idmapping, bool, 0644); 2018 MODULE_PARM_DESC(nfs4_disable_idmapping, 2019 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2020