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 int nfs4_disable_idmapping = 0; 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 #else 254 static void nfs4_shutdown_client(struct nfs_client *clp) 255 { 256 } 257 258 void nfs_cleanup_cb_ident_idr(void) 259 { 260 } 261 262 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 263 { 264 } 265 266 static void pnfs_init_server(struct nfs_server *server) 267 { 268 } 269 270 #endif /* CONFIG_NFS_V4 */ 271 272 /* 273 * Destroy a shared client record 274 */ 275 static void nfs_free_client(struct nfs_client *clp) 276 { 277 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 278 279 nfs4_shutdown_client(clp); 280 281 nfs_fscache_release_client_cookie(clp); 282 283 /* -EIO all pending I/O */ 284 if (!IS_ERR(clp->cl_rpcclient)) 285 rpc_shutdown_client(clp->cl_rpcclient); 286 287 if (clp->cl_machine_cred != NULL) 288 put_rpccred(clp->cl_machine_cred); 289 290 nfs4_deviceid_purge_client(clp); 291 292 kfree(clp->cl_hostname); 293 kfree(clp->server_scope); 294 kfree(clp); 295 296 dprintk("<-- nfs_free_client()\n"); 297 } 298 299 /* 300 * Release a reference to a shared client record 301 */ 302 void nfs_put_client(struct nfs_client *clp) 303 { 304 if (!clp) 305 return; 306 307 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 308 309 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 310 list_del(&clp->cl_share_link); 311 nfs_cb_idr_remove_locked(clp); 312 spin_unlock(&nfs_client_lock); 313 314 BUG_ON(!list_empty(&clp->cl_superblocks)); 315 316 nfs_free_client(clp); 317 } 318 } 319 EXPORT_SYMBOL_GPL(nfs_put_client); 320 321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 322 /* 323 * Test if two ip6 socket addresses refer to the same socket by 324 * comparing relevant fields. The padding bytes specifically, are not 325 * compared. sin6_flowinfo is not compared because it only affects QoS 326 * and sin6_scope_id is only compared if the address is "link local" 327 * because "link local" addresses need only be unique to a specific 328 * link. Conversely, ordinary unicast addresses might have different 329 * sin6_scope_id. 330 * 331 * The caller should ensure both socket addresses are AF_INET6. 332 */ 333 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 334 const struct sockaddr *sa2) 335 { 336 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 337 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 338 339 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 340 sin1->sin6_scope_id != sin2->sin6_scope_id) 341 return 0; 342 343 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); 344 } 345 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 346 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 347 const struct sockaddr *sa2) 348 { 349 return 0; 350 } 351 #endif 352 353 /* 354 * Test if two ip4 socket addresses refer to the same socket, by 355 * comparing relevant fields. The padding bytes specifically, are 356 * not compared. 357 * 358 * The caller should ensure both socket addresses are AF_INET. 359 */ 360 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 361 const struct sockaddr *sa2) 362 { 363 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 364 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 365 366 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 367 } 368 369 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 370 const struct sockaddr *sa2) 371 { 372 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 373 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 374 375 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 376 (sin1->sin6_port == sin2->sin6_port); 377 } 378 379 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 380 const struct sockaddr *sa2) 381 { 382 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 383 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 384 385 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 386 (sin1->sin_port == sin2->sin_port); 387 } 388 389 /* 390 * Test if two socket addresses represent the same actual socket, 391 * by comparing (only) relevant fields, excluding the port number. 392 */ 393 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 394 const struct sockaddr *sa2) 395 { 396 if (sa1->sa_family != sa2->sa_family) 397 return 0; 398 399 switch (sa1->sa_family) { 400 case AF_INET: 401 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 402 case AF_INET6: 403 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 404 } 405 return 0; 406 } 407 408 /* 409 * Test if two socket addresses represent the same actual socket, 410 * by comparing (only) relevant fields, including the port number. 411 */ 412 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 413 const struct sockaddr *sa2) 414 { 415 if (sa1->sa_family != sa2->sa_family) 416 return 0; 417 418 switch (sa1->sa_family) { 419 case AF_INET: 420 return nfs_sockaddr_cmp_ip4(sa1, sa2); 421 case AF_INET6: 422 return nfs_sockaddr_cmp_ip6(sa1, sa2); 423 } 424 return 0; 425 } 426 427 /* Common match routine for v4.0 and v4.1 callback services */ 428 bool 429 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, 430 u32 minorversion) 431 { 432 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 433 434 /* Don't match clients that failed to initialise */ 435 if (!(clp->cl_cons_state == NFS_CS_READY || 436 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 437 return false; 438 439 /* Match the version and minorversion */ 440 if (clp->rpc_ops->version != 4 || 441 clp->cl_minorversion != minorversion) 442 return false; 443 444 /* Match only the IP address, not the port number */ 445 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 446 return false; 447 448 return true; 449 } 450 451 /* 452 * Find an nfs_client on the list that matches the initialisation data 453 * that is supplied. 454 */ 455 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 456 { 457 struct nfs_client *clp; 458 const struct sockaddr *sap = data->addr; 459 460 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 461 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 462 /* Don't match clients that failed to initialise properly */ 463 if (clp->cl_cons_state < 0) 464 continue; 465 466 /* Different NFS versions cannot share the same nfs_client */ 467 if (clp->rpc_ops != data->rpc_ops) 468 continue; 469 470 if (clp->cl_proto != data->proto) 471 continue; 472 /* Match nfsv4 minorversion */ 473 if (clp->cl_minorversion != data->minorversion) 474 continue; 475 /* Match the full socket address */ 476 if (!nfs_sockaddr_cmp(sap, clap)) 477 continue; 478 479 atomic_inc(&clp->cl_count); 480 return clp; 481 } 482 return NULL; 483 } 484 485 /* 486 * Look up a client by IP address and protocol version 487 * - creates a new record if one doesn't yet exist 488 */ 489 static struct nfs_client * 490 nfs_get_client(const struct nfs_client_initdata *cl_init, 491 const struct rpc_timeout *timeparms, 492 const char *ip_addr, 493 rpc_authflavor_t authflavour, 494 int noresvport) 495 { 496 struct nfs_client *clp, *new = NULL; 497 int error; 498 499 dprintk("--> nfs_get_client(%s,v%u)\n", 500 cl_init->hostname ?: "", cl_init->rpc_ops->version); 501 502 /* see if the client already exists */ 503 do { 504 spin_lock(&nfs_client_lock); 505 506 clp = nfs_match_client(cl_init); 507 if (clp) 508 goto found_client; 509 if (new) 510 goto install_client; 511 512 spin_unlock(&nfs_client_lock); 513 514 new = nfs_alloc_client(cl_init); 515 } while (!IS_ERR(new)); 516 517 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 518 return new; 519 520 /* install a new client and return with it unready */ 521 install_client: 522 clp = new; 523 list_add(&clp->cl_share_link, &nfs_client_list); 524 spin_unlock(&nfs_client_lock); 525 526 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, 527 authflavour, noresvport); 528 if (error < 0) { 529 nfs_put_client(clp); 530 return ERR_PTR(error); 531 } 532 dprintk("--> nfs_get_client() = %p [new]\n", clp); 533 return clp; 534 535 /* found an existing client 536 * - make sure it's ready before returning 537 */ 538 found_client: 539 spin_unlock(&nfs_client_lock); 540 541 if (new) 542 nfs_free_client(new); 543 544 error = wait_event_killable(nfs_client_active_wq, 545 clp->cl_cons_state < NFS_CS_INITING); 546 if (error < 0) { 547 nfs_put_client(clp); 548 return ERR_PTR(-ERESTARTSYS); 549 } 550 551 if (clp->cl_cons_state < NFS_CS_READY) { 552 error = clp->cl_cons_state; 553 nfs_put_client(clp); 554 return ERR_PTR(error); 555 } 556 557 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 558 559 dprintk("--> nfs_get_client() = %p [share]\n", clp); 560 return clp; 561 } 562 563 /* 564 * Mark a server as ready or failed 565 */ 566 void nfs_mark_client_ready(struct nfs_client *clp, int state) 567 { 568 clp->cl_cons_state = state; 569 wake_up_all(&nfs_client_active_wq); 570 } 571 572 /* 573 * With sessions, the client is not marked ready until after a 574 * successful EXCHANGE_ID and CREATE_SESSION. 575 * 576 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 577 * other versions of NFS can be tried. 578 */ 579 int nfs4_check_client_ready(struct nfs_client *clp) 580 { 581 if (!nfs4_has_session(clp)) 582 return 0; 583 if (clp->cl_cons_state < NFS_CS_READY) 584 return -EPROTONOSUPPORT; 585 return 0; 586 } 587 588 /* 589 * Initialise the timeout values for a connection 590 */ 591 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 592 unsigned int timeo, unsigned int retrans) 593 { 594 to->to_initval = timeo * HZ / 10; 595 to->to_retries = retrans; 596 597 switch (proto) { 598 case XPRT_TRANSPORT_TCP: 599 case XPRT_TRANSPORT_RDMA: 600 if (to->to_retries == 0) 601 to->to_retries = NFS_DEF_TCP_RETRANS; 602 if (to->to_initval == 0) 603 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 604 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 605 to->to_initval = NFS_MAX_TCP_TIMEOUT; 606 to->to_increment = to->to_initval; 607 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 608 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 609 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 610 if (to->to_maxval < to->to_initval) 611 to->to_maxval = to->to_initval; 612 to->to_exponential = 0; 613 break; 614 case XPRT_TRANSPORT_UDP: 615 if (to->to_retries == 0) 616 to->to_retries = NFS_DEF_UDP_RETRANS; 617 if (!to->to_initval) 618 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 619 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 620 to->to_initval = NFS_MAX_UDP_TIMEOUT; 621 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 622 to->to_exponential = 1; 623 break; 624 default: 625 BUG(); 626 } 627 } 628 629 /* 630 * Create an RPC client handle 631 */ 632 static int nfs_create_rpc_client(struct nfs_client *clp, 633 const struct rpc_timeout *timeparms, 634 rpc_authflavor_t flavor, 635 int discrtry, int noresvport) 636 { 637 struct rpc_clnt *clnt = NULL; 638 struct rpc_create_args args = { 639 .net = &init_net, 640 .protocol = clp->cl_proto, 641 .address = (struct sockaddr *)&clp->cl_addr, 642 .addrsize = clp->cl_addrlen, 643 .timeout = timeparms, 644 .servername = clp->cl_hostname, 645 .program = &nfs_program, 646 .version = clp->rpc_ops->version, 647 .authflavor = flavor, 648 }; 649 650 if (discrtry) 651 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 652 if (noresvport) 653 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 654 655 if (!IS_ERR(clp->cl_rpcclient)) 656 return 0; 657 658 clnt = rpc_create(&args); 659 if (IS_ERR(clnt)) { 660 dprintk("%s: cannot create RPC client. Error = %ld\n", 661 __func__, PTR_ERR(clnt)); 662 return PTR_ERR(clnt); 663 } 664 665 clp->cl_rpcclient = clnt; 666 return 0; 667 } 668 669 /* 670 * Version 2 or 3 client destruction 671 */ 672 static void nfs_destroy_server(struct nfs_server *server) 673 { 674 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 675 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 676 nlmclnt_done(server->nlm_host); 677 } 678 679 /* 680 * Version 2 or 3 lockd setup 681 */ 682 static int nfs_start_lockd(struct nfs_server *server) 683 { 684 struct nlm_host *host; 685 struct nfs_client *clp = server->nfs_client; 686 struct nlmclnt_initdata nlm_init = { 687 .hostname = clp->cl_hostname, 688 .address = (struct sockaddr *)&clp->cl_addr, 689 .addrlen = clp->cl_addrlen, 690 .nfs_version = clp->rpc_ops->version, 691 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 692 1 : 0, 693 }; 694 695 if (nlm_init.nfs_version > 3) 696 return 0; 697 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 698 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 699 return 0; 700 701 switch (clp->cl_proto) { 702 default: 703 nlm_init.protocol = IPPROTO_TCP; 704 break; 705 case XPRT_TRANSPORT_UDP: 706 nlm_init.protocol = IPPROTO_UDP; 707 } 708 709 host = nlmclnt_init(&nlm_init); 710 if (IS_ERR(host)) 711 return PTR_ERR(host); 712 713 server->nlm_host = host; 714 server->destroy = nfs_destroy_server; 715 return 0; 716 } 717 718 /* 719 * Initialise an NFSv3 ACL client connection 720 */ 721 #ifdef CONFIG_NFS_V3_ACL 722 static void nfs_init_server_aclclient(struct nfs_server *server) 723 { 724 if (server->nfs_client->rpc_ops->version != 3) 725 goto out_noacl; 726 if (server->flags & NFS_MOUNT_NOACL) 727 goto out_noacl; 728 729 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 730 if (IS_ERR(server->client_acl)) 731 goto out_noacl; 732 733 /* No errors! Assume that Sun nfsacls are supported */ 734 server->caps |= NFS_CAP_ACLS; 735 return; 736 737 out_noacl: 738 server->caps &= ~NFS_CAP_ACLS; 739 } 740 #else 741 static inline void nfs_init_server_aclclient(struct nfs_server *server) 742 { 743 server->flags &= ~NFS_MOUNT_NOACL; 744 server->caps &= ~NFS_CAP_ACLS; 745 } 746 #endif 747 748 /* 749 * Create a general RPC client 750 */ 751 static int nfs_init_server_rpcclient(struct nfs_server *server, 752 const struct rpc_timeout *timeo, 753 rpc_authflavor_t pseudoflavour) 754 { 755 struct nfs_client *clp = server->nfs_client; 756 757 server->client = rpc_clone_client(clp->cl_rpcclient); 758 if (IS_ERR(server->client)) { 759 dprintk("%s: couldn't create rpc_client!\n", __func__); 760 return PTR_ERR(server->client); 761 } 762 763 memcpy(&server->client->cl_timeout_default, 764 timeo, 765 sizeof(server->client->cl_timeout_default)); 766 server->client->cl_timeout = &server->client->cl_timeout_default; 767 768 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 769 struct rpc_auth *auth; 770 771 auth = rpcauth_create(pseudoflavour, server->client); 772 if (IS_ERR(auth)) { 773 dprintk("%s: couldn't create credcache!\n", __func__); 774 return PTR_ERR(auth); 775 } 776 } 777 server->client->cl_softrtry = 0; 778 if (server->flags & NFS_MOUNT_SOFT) 779 server->client->cl_softrtry = 1; 780 781 return 0; 782 } 783 784 /* 785 * Initialise an NFS2 or NFS3 client 786 */ 787 int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, 788 const char *ip_addr, rpc_authflavor_t authflavour, 789 int noresvport) 790 { 791 int error; 792 793 if (clp->cl_cons_state == NFS_CS_READY) { 794 /* the client is already initialised */ 795 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 796 return 0; 797 } 798 799 /* 800 * Create a client RPC handle for doing FSSTAT with UNIX auth only 801 * - RFC 2623, sec 2.3.2 802 */ 803 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 804 0, noresvport); 805 if (error < 0) 806 goto error; 807 nfs_mark_client_ready(clp, NFS_CS_READY); 808 return 0; 809 810 error: 811 nfs_mark_client_ready(clp, error); 812 dprintk("<-- nfs_init_client() = xerror %d\n", error); 813 return error; 814 } 815 816 /* 817 * Create a version 2 or 3 client 818 */ 819 static int nfs_init_server(struct nfs_server *server, 820 const struct nfs_parsed_mount_data *data) 821 { 822 struct nfs_client_initdata cl_init = { 823 .hostname = data->nfs_server.hostname, 824 .addr = (const struct sockaddr *)&data->nfs_server.address, 825 .addrlen = data->nfs_server.addrlen, 826 .rpc_ops = &nfs_v2_clientops, 827 .proto = data->nfs_server.protocol, 828 }; 829 struct rpc_timeout timeparms; 830 struct nfs_client *clp; 831 int error; 832 833 dprintk("--> nfs_init_server()\n"); 834 835 #ifdef CONFIG_NFS_V3 836 if (data->version == 3) 837 cl_init.rpc_ops = &nfs_v3_clientops; 838 #endif 839 840 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 841 data->timeo, data->retrans); 842 843 /* Allocate or find a client reference we can use */ 844 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, 845 data->flags & NFS_MOUNT_NORESVPORT); 846 if (IS_ERR(clp)) { 847 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 848 return PTR_ERR(clp); 849 } 850 851 server->nfs_client = clp; 852 853 /* Initialise the client representation from the mount data */ 854 server->flags = data->flags; 855 server->options = data->options; 856 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 857 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 858 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 859 860 if (data->rsize) 861 server->rsize = nfs_block_size(data->rsize, NULL); 862 if (data->wsize) 863 server->wsize = nfs_block_size(data->wsize, NULL); 864 865 server->acregmin = data->acregmin * HZ; 866 server->acregmax = data->acregmax * HZ; 867 server->acdirmin = data->acdirmin * HZ; 868 server->acdirmax = data->acdirmax * HZ; 869 870 /* Start lockd here, before we might error out */ 871 error = nfs_start_lockd(server); 872 if (error < 0) 873 goto error; 874 875 server->port = data->nfs_server.port; 876 877 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 878 if (error < 0) 879 goto error; 880 881 /* Preserve the values of mount_server-related mount options */ 882 if (data->mount_server.addrlen) { 883 memcpy(&server->mountd_address, &data->mount_server.address, 884 data->mount_server.addrlen); 885 server->mountd_addrlen = data->mount_server.addrlen; 886 } 887 server->mountd_version = data->mount_server.version; 888 server->mountd_port = data->mount_server.port; 889 server->mountd_protocol = data->mount_server.protocol; 890 891 server->namelen = data->namlen; 892 /* Create a client RPC handle for the NFSv3 ACL management interface */ 893 nfs_init_server_aclclient(server); 894 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 895 return 0; 896 897 error: 898 server->nfs_client = NULL; 899 nfs_put_client(clp); 900 dprintk("<-- nfs_init_server() = xerror %d\n", error); 901 return error; 902 } 903 904 /* 905 * Load up the server record from information gained in an fsinfo record 906 */ 907 static void nfs_server_set_fsinfo(struct nfs_server *server, 908 struct nfs_fh *mntfh, 909 struct nfs_fsinfo *fsinfo) 910 { 911 unsigned long max_rpc_payload; 912 913 /* Work out a lot of parameters */ 914 if (server->rsize == 0) 915 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 916 if (server->wsize == 0) 917 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 918 919 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 920 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 921 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 922 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 923 924 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 925 if (server->rsize > max_rpc_payload) 926 server->rsize = max_rpc_payload; 927 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 928 server->rsize = NFS_MAX_FILE_IO_SIZE; 929 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 930 931 server->backing_dev_info.name = "nfs"; 932 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 933 934 if (server->wsize > max_rpc_payload) 935 server->wsize = max_rpc_payload; 936 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 937 server->wsize = NFS_MAX_FILE_IO_SIZE; 938 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 939 server->pnfs_blksize = fsinfo->blksize; 940 set_pnfs_layoutdriver(server, mntfh, fsinfo->layouttype); 941 942 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 943 944 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 945 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 946 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 947 if (server->dtsize > server->rsize) 948 server->dtsize = server->rsize; 949 950 if (server->flags & NFS_MOUNT_NOAC) { 951 server->acregmin = server->acregmax = 0; 952 server->acdirmin = server->acdirmax = 0; 953 } 954 955 server->maxfilesize = fsinfo->maxfilesize; 956 957 server->time_delta = fsinfo->time_delta; 958 959 /* We're airborne Set socket buffersize */ 960 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 961 } 962 963 /* 964 * Probe filesystem information, including the FSID on v2/v3 965 */ 966 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 967 { 968 struct nfs_fsinfo fsinfo; 969 struct nfs_client *clp = server->nfs_client; 970 int error; 971 972 dprintk("--> nfs_probe_fsinfo()\n"); 973 974 if (clp->rpc_ops->set_capabilities != NULL) { 975 error = clp->rpc_ops->set_capabilities(server, mntfh); 976 if (error < 0) 977 goto out_error; 978 } 979 980 fsinfo.fattr = fattr; 981 fsinfo.layouttype = 0; 982 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 983 if (error < 0) 984 goto out_error; 985 986 nfs_server_set_fsinfo(server, mntfh, &fsinfo); 987 988 /* Get some general file system info */ 989 if (server->namelen == 0) { 990 struct nfs_pathconf pathinfo; 991 992 pathinfo.fattr = fattr; 993 nfs_fattr_init(fattr); 994 995 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 996 server->namelen = pathinfo.max_namelen; 997 } 998 999 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 1000 return 0; 1001 1002 out_error: 1003 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1004 return error; 1005 } 1006 1007 /* 1008 * Copy useful information when duplicating a server record 1009 */ 1010 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1011 { 1012 target->flags = source->flags; 1013 target->rsize = source->rsize; 1014 target->wsize = source->wsize; 1015 target->acregmin = source->acregmin; 1016 target->acregmax = source->acregmax; 1017 target->acdirmin = source->acdirmin; 1018 target->acdirmax = source->acdirmax; 1019 target->caps = source->caps; 1020 target->options = source->options; 1021 } 1022 1023 static void nfs_server_insert_lists(struct nfs_server *server) 1024 { 1025 struct nfs_client *clp = server->nfs_client; 1026 1027 spin_lock(&nfs_client_lock); 1028 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1029 list_add_tail(&server->master_link, &nfs_volume_list); 1030 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1031 spin_unlock(&nfs_client_lock); 1032 1033 } 1034 1035 static void nfs_server_remove_lists(struct nfs_server *server) 1036 { 1037 struct nfs_client *clp = server->nfs_client; 1038 1039 spin_lock(&nfs_client_lock); 1040 list_del_rcu(&server->client_link); 1041 if (clp && list_empty(&clp->cl_superblocks)) 1042 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1043 list_del(&server->master_link); 1044 spin_unlock(&nfs_client_lock); 1045 1046 synchronize_rcu(); 1047 } 1048 1049 /* 1050 * Allocate and initialise a server record 1051 */ 1052 static struct nfs_server *nfs_alloc_server(void) 1053 { 1054 struct nfs_server *server; 1055 1056 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1057 if (!server) 1058 return NULL; 1059 1060 server->client = server->client_acl = ERR_PTR(-EINVAL); 1061 1062 /* Zero out the NFS state stuff */ 1063 INIT_LIST_HEAD(&server->client_link); 1064 INIT_LIST_HEAD(&server->master_link); 1065 INIT_LIST_HEAD(&server->delegations); 1066 INIT_LIST_HEAD(&server->layouts); 1067 1068 atomic_set(&server->active, 0); 1069 1070 server->io_stats = nfs_alloc_iostats(); 1071 if (!server->io_stats) { 1072 kfree(server); 1073 return NULL; 1074 } 1075 1076 if (bdi_init(&server->backing_dev_info)) { 1077 nfs_free_iostats(server->io_stats); 1078 kfree(server); 1079 return NULL; 1080 } 1081 1082 pnfs_init_server(server); 1083 1084 return server; 1085 } 1086 1087 /* 1088 * Free up a server record 1089 */ 1090 void nfs_free_server(struct nfs_server *server) 1091 { 1092 dprintk("--> nfs_free_server()\n"); 1093 1094 nfs_server_remove_lists(server); 1095 unset_pnfs_layoutdriver(server); 1096 1097 if (server->destroy != NULL) 1098 server->destroy(server); 1099 1100 if (!IS_ERR(server->client_acl)) 1101 rpc_shutdown_client(server->client_acl); 1102 if (!IS_ERR(server->client)) 1103 rpc_shutdown_client(server->client); 1104 1105 nfs_put_client(server->nfs_client); 1106 1107 nfs_free_iostats(server->io_stats); 1108 bdi_destroy(&server->backing_dev_info); 1109 kfree(server); 1110 nfs_release_automount_timer(); 1111 dprintk("<-- nfs_free_server()\n"); 1112 } 1113 1114 /* 1115 * Create a version 2 or 3 volume record 1116 * - keyed on server and FSID 1117 */ 1118 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1119 struct nfs_fh *mntfh) 1120 { 1121 struct nfs_server *server; 1122 struct nfs_fattr *fattr; 1123 int error; 1124 1125 server = nfs_alloc_server(); 1126 if (!server) 1127 return ERR_PTR(-ENOMEM); 1128 1129 error = -ENOMEM; 1130 fattr = nfs_alloc_fattr(); 1131 if (fattr == NULL) 1132 goto error; 1133 1134 /* Get a client representation */ 1135 error = nfs_init_server(server, data); 1136 if (error < 0) 1137 goto error; 1138 1139 BUG_ON(!server->nfs_client); 1140 BUG_ON(!server->nfs_client->rpc_ops); 1141 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1142 1143 /* Probe the root fh to retrieve its FSID */ 1144 error = nfs_probe_fsinfo(server, mntfh, fattr); 1145 if (error < 0) 1146 goto error; 1147 if (server->nfs_client->rpc_ops->version == 3) { 1148 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1149 server->namelen = NFS3_MAXNAMLEN; 1150 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1151 server->caps |= NFS_CAP_READDIRPLUS; 1152 } else { 1153 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1154 server->namelen = NFS2_MAXNAMLEN; 1155 } 1156 1157 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1158 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1159 if (error < 0) { 1160 dprintk("nfs_create_server: getattr error = %d\n", -error); 1161 goto error; 1162 } 1163 } 1164 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1165 1166 dprintk("Server FSID: %llx:%llx\n", 1167 (unsigned long long) server->fsid.major, 1168 (unsigned long long) server->fsid.minor); 1169 1170 nfs_server_insert_lists(server); 1171 server->mount_time = jiffies; 1172 nfs_free_fattr(fattr); 1173 return server; 1174 1175 error: 1176 nfs_free_fattr(fattr); 1177 nfs_free_server(server); 1178 return ERR_PTR(error); 1179 } 1180 1181 #ifdef CONFIG_NFS_V4 1182 /* 1183 * NFSv4.0 callback thread helper 1184 * 1185 * Find a client by IP address, protocol version, and minorversion 1186 * 1187 * Called from the pg_authenticate method. The callback identifier 1188 * is not used as it has not been decoded. 1189 * 1190 * Returns NULL if no such client 1191 */ 1192 struct nfs_client * 1193 nfs4_find_client_no_ident(const struct sockaddr *addr) 1194 { 1195 struct nfs_client *clp; 1196 1197 spin_lock(&nfs_client_lock); 1198 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1199 if (nfs4_cb_match_client(addr, clp, 0) == false) 1200 continue; 1201 atomic_inc(&clp->cl_count); 1202 spin_unlock(&nfs_client_lock); 1203 return clp; 1204 } 1205 spin_unlock(&nfs_client_lock); 1206 return NULL; 1207 } 1208 1209 /* 1210 * NFSv4.0 callback thread helper 1211 * 1212 * Find a client by callback identifier 1213 */ 1214 struct nfs_client * 1215 nfs4_find_client_ident(int cb_ident) 1216 { 1217 struct nfs_client *clp; 1218 1219 spin_lock(&nfs_client_lock); 1220 clp = idr_find(&cb_ident_idr, cb_ident); 1221 if (clp) 1222 atomic_inc(&clp->cl_count); 1223 spin_unlock(&nfs_client_lock); 1224 return clp; 1225 } 1226 1227 #if defined(CONFIG_NFS_V4_1) 1228 /* 1229 * NFSv4.1 callback thread helper 1230 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1231 * minorversion, and sessionID 1232 * 1233 * Returns NULL if no such client 1234 */ 1235 struct nfs_client * 1236 nfs4_find_client_sessionid(const struct sockaddr *addr, 1237 struct nfs4_sessionid *sid) 1238 { 1239 struct nfs_client *clp; 1240 1241 spin_lock(&nfs_client_lock); 1242 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1243 if (nfs4_cb_match_client(addr, clp, 1) == false) 1244 continue; 1245 1246 if (!nfs4_has_session(clp)) 1247 continue; 1248 1249 /* Match sessionid*/ 1250 if (memcmp(clp->cl_session->sess_id.data, 1251 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1252 continue; 1253 1254 atomic_inc(&clp->cl_count); 1255 spin_unlock(&nfs_client_lock); 1256 return clp; 1257 } 1258 spin_unlock(&nfs_client_lock); 1259 return NULL; 1260 } 1261 1262 #else /* CONFIG_NFS_V4_1 */ 1263 1264 struct nfs_client * 1265 nfs4_find_client_sessionid(const struct sockaddr *addr, 1266 struct nfs4_sessionid *sid) 1267 { 1268 return NULL; 1269 } 1270 #endif /* CONFIG_NFS_V4_1 */ 1271 1272 /* 1273 * Initialize the NFS4 callback service 1274 */ 1275 static int nfs4_init_callback(struct nfs_client *clp) 1276 { 1277 int error; 1278 1279 if (clp->rpc_ops->version == 4) { 1280 if (nfs4_has_session(clp)) { 1281 error = xprt_setup_backchannel( 1282 clp->cl_rpcclient->cl_xprt, 1283 NFS41_BC_MIN_CALLBACKS); 1284 if (error < 0) 1285 return error; 1286 } 1287 1288 error = nfs_callback_up(clp->cl_mvops->minor_version, 1289 clp->cl_rpcclient->cl_xprt); 1290 if (error < 0) { 1291 dprintk("%s: failed to start callback. Error = %d\n", 1292 __func__, error); 1293 return error; 1294 } 1295 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1296 } 1297 return 0; 1298 } 1299 1300 /* 1301 * Initialize the minor version specific parts of an NFS4 client record 1302 */ 1303 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1304 { 1305 #if defined(CONFIG_NFS_V4_1) 1306 if (clp->cl_mvops->minor_version) { 1307 struct nfs4_session *session = NULL; 1308 /* 1309 * Create the session and mark it expired. 1310 * When a SEQUENCE operation encounters the expired session 1311 * it will do session recovery to initialize it. 1312 */ 1313 session = nfs4_alloc_session(clp); 1314 if (!session) 1315 return -ENOMEM; 1316 1317 clp->cl_session = session; 1318 /* 1319 * The create session reply races with the server back 1320 * channel probe. Mark the client NFS_CS_SESSION_INITING 1321 * so that the client back channel can find the 1322 * nfs_client struct 1323 */ 1324 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1325 } 1326 #endif /* CONFIG_NFS_V4_1 */ 1327 1328 return nfs4_init_callback(clp); 1329 } 1330 1331 /* 1332 * Initialise an NFS4 client record 1333 */ 1334 int nfs4_init_client(struct nfs_client *clp, 1335 const struct rpc_timeout *timeparms, 1336 const char *ip_addr, 1337 rpc_authflavor_t authflavour, 1338 int noresvport) 1339 { 1340 int error; 1341 1342 if (clp->cl_cons_state == NFS_CS_READY) { 1343 /* the client is initialised already */ 1344 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1345 return 0; 1346 } 1347 1348 /* Check NFS protocol revision and initialize RPC op vector */ 1349 clp->rpc_ops = &nfs_v4_clientops; 1350 1351 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1352 1, noresvport); 1353 if (error < 0) 1354 goto error; 1355 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1356 1357 error = nfs_idmap_new(clp); 1358 if (error < 0) { 1359 dprintk("%s: failed to create idmapper. Error = %d\n", 1360 __func__, error); 1361 goto error; 1362 } 1363 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1364 1365 error = nfs4_init_client_minor_version(clp); 1366 if (error < 0) 1367 goto error; 1368 1369 if (!nfs4_has_session(clp)) 1370 nfs_mark_client_ready(clp, NFS_CS_READY); 1371 return 0; 1372 1373 error: 1374 nfs_mark_client_ready(clp, error); 1375 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1376 return error; 1377 } 1378 1379 /* 1380 * Set up an NFS4 client 1381 */ 1382 static int nfs4_set_client(struct nfs_server *server, 1383 const char *hostname, 1384 const struct sockaddr *addr, 1385 const size_t addrlen, 1386 const char *ip_addr, 1387 rpc_authflavor_t authflavour, 1388 int proto, const struct rpc_timeout *timeparms, 1389 u32 minorversion) 1390 { 1391 struct nfs_client_initdata cl_init = { 1392 .hostname = hostname, 1393 .addr = addr, 1394 .addrlen = addrlen, 1395 .rpc_ops = &nfs_v4_clientops, 1396 .proto = proto, 1397 .minorversion = minorversion, 1398 }; 1399 struct nfs_client *clp; 1400 int error; 1401 1402 dprintk("--> nfs4_set_client()\n"); 1403 1404 /* Allocate or find a client reference we can use */ 1405 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1406 server->flags & NFS_MOUNT_NORESVPORT); 1407 if (IS_ERR(clp)) { 1408 error = PTR_ERR(clp); 1409 goto error; 1410 } 1411 1412 /* 1413 * Query for the lease time on clientid setup or renewal 1414 * 1415 * Note that this will be set on nfs_clients that were created 1416 * only for the DS role and did not set this bit, but now will 1417 * serve a dual role. 1418 */ 1419 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1420 1421 server->nfs_client = clp; 1422 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1423 return 0; 1424 error: 1425 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1426 return error; 1427 } 1428 1429 /* 1430 * Set up a pNFS Data Server client. 1431 * 1432 * Return any existing nfs_client that matches server address,port,version 1433 * and minorversion. 1434 * 1435 * For a new nfs_client, use a soft mount (default), a low retrans and a 1436 * low timeout interval so that if a connection is lost, we retry through 1437 * the MDS. 1438 */ 1439 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1440 const struct sockaddr *ds_addr, 1441 int ds_addrlen, int ds_proto) 1442 { 1443 struct nfs_client_initdata cl_init = { 1444 .addr = ds_addr, 1445 .addrlen = ds_addrlen, 1446 .rpc_ops = &nfs_v4_clientops, 1447 .proto = ds_proto, 1448 .minorversion = mds_clp->cl_minorversion, 1449 }; 1450 struct rpc_timeout ds_timeout = { 1451 .to_initval = 15 * HZ, 1452 .to_maxval = 15 * HZ, 1453 .to_retries = 1, 1454 .to_exponential = 1, 1455 }; 1456 struct nfs_client *clp; 1457 1458 /* 1459 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1460 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1461 * (section 13.1 RFC 5661). 1462 */ 1463 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1464 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1465 1466 dprintk("<-- %s %p\n", __func__, clp); 1467 return clp; 1468 } 1469 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1470 1471 /* 1472 * Session has been established, and the client marked ready. 1473 * Set the mount rsize and wsize with negotiated fore channel 1474 * attributes which will be bound checked in nfs_server_set_fsinfo. 1475 */ 1476 static void nfs4_session_set_rwsize(struct nfs_server *server) 1477 { 1478 #ifdef CONFIG_NFS_V4_1 1479 struct nfs4_session *sess; 1480 u32 server_resp_sz; 1481 u32 server_rqst_sz; 1482 1483 if (!nfs4_has_session(server->nfs_client)) 1484 return; 1485 sess = server->nfs_client->cl_session; 1486 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1487 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1488 1489 if (server->rsize > server_resp_sz) 1490 server->rsize = server_resp_sz; 1491 if (server->wsize > server_rqst_sz) 1492 server->wsize = server_rqst_sz; 1493 #endif /* CONFIG_NFS_V4_1 */ 1494 } 1495 1496 static int nfs4_server_common_setup(struct nfs_server *server, 1497 struct nfs_fh *mntfh) 1498 { 1499 struct nfs_fattr *fattr; 1500 int error; 1501 1502 BUG_ON(!server->nfs_client); 1503 BUG_ON(!server->nfs_client->rpc_ops); 1504 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1505 1506 /* data servers support only a subset of NFSv4.1 */ 1507 if (is_ds_only_client(server->nfs_client)) 1508 return -EPROTONOSUPPORT; 1509 1510 fattr = nfs_alloc_fattr(); 1511 if (fattr == NULL) 1512 return -ENOMEM; 1513 1514 /* We must ensure the session is initialised first */ 1515 error = nfs4_init_session(server); 1516 if (error < 0) 1517 goto out; 1518 1519 /* Probe the root fh to retrieve its FSID and filehandle */ 1520 error = nfs4_get_rootfh(server, mntfh); 1521 if (error < 0) 1522 goto out; 1523 1524 dprintk("Server FSID: %llx:%llx\n", 1525 (unsigned long long) server->fsid.major, 1526 (unsigned long long) server->fsid.minor); 1527 dprintk("Mount FH: %d\n", mntfh->size); 1528 1529 nfs4_session_set_rwsize(server); 1530 1531 error = nfs_probe_fsinfo(server, mntfh, fattr); 1532 if (error < 0) 1533 goto out; 1534 1535 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1536 server->namelen = NFS4_MAXNAMLEN; 1537 1538 nfs_server_insert_lists(server); 1539 server->mount_time = jiffies; 1540 out: 1541 nfs_free_fattr(fattr); 1542 return error; 1543 } 1544 1545 /* 1546 * Create a version 4 volume record 1547 */ 1548 static int nfs4_init_server(struct nfs_server *server, 1549 const struct nfs_parsed_mount_data *data) 1550 { 1551 struct rpc_timeout timeparms; 1552 int error; 1553 1554 dprintk("--> nfs4_init_server()\n"); 1555 1556 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1557 data->timeo, data->retrans); 1558 1559 /* Initialise the client representation from the mount data */ 1560 server->flags = data->flags; 1561 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1562 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1563 server->caps |= NFS_CAP_READDIRPLUS; 1564 server->options = data->options; 1565 1566 /* Get a client record */ 1567 error = nfs4_set_client(server, 1568 data->nfs_server.hostname, 1569 (const struct sockaddr *)&data->nfs_server.address, 1570 data->nfs_server.addrlen, 1571 data->client_address, 1572 data->auth_flavors[0], 1573 data->nfs_server.protocol, 1574 &timeparms, 1575 data->minorversion); 1576 if (error < 0) 1577 goto error; 1578 1579 /* 1580 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1581 * authentication. 1582 */ 1583 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1584 server->caps |= NFS_CAP_UIDGID_NOMAP; 1585 1586 if (data->rsize) 1587 server->rsize = nfs_block_size(data->rsize, NULL); 1588 if (data->wsize) 1589 server->wsize = nfs_block_size(data->wsize, NULL); 1590 1591 server->acregmin = data->acregmin * HZ; 1592 server->acregmax = data->acregmax * HZ; 1593 server->acdirmin = data->acdirmin * HZ; 1594 server->acdirmax = data->acdirmax * HZ; 1595 1596 server->port = data->nfs_server.port; 1597 1598 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1599 1600 error: 1601 /* Done */ 1602 dprintk("<-- nfs4_init_server() = %d\n", error); 1603 return error; 1604 } 1605 1606 /* 1607 * Create a version 4 volume record 1608 * - keyed on server and FSID 1609 */ 1610 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1611 struct nfs_fh *mntfh) 1612 { 1613 struct nfs_server *server; 1614 int error; 1615 1616 dprintk("--> nfs4_create_server()\n"); 1617 1618 server = nfs_alloc_server(); 1619 if (!server) 1620 return ERR_PTR(-ENOMEM); 1621 1622 /* set up the general RPC client */ 1623 error = nfs4_init_server(server, data); 1624 if (error < 0) 1625 goto error; 1626 1627 error = nfs4_server_common_setup(server, mntfh); 1628 if (error < 0) 1629 goto error; 1630 1631 dprintk("<-- nfs4_create_server() = %p\n", server); 1632 return server; 1633 1634 error: 1635 nfs_free_server(server); 1636 dprintk("<-- nfs4_create_server() = error %d\n", error); 1637 return ERR_PTR(error); 1638 } 1639 1640 /* 1641 * Create an NFS4 referral server record 1642 */ 1643 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1644 struct nfs_fh *mntfh) 1645 { 1646 struct nfs_client *parent_client; 1647 struct nfs_server *server, *parent_server; 1648 int error; 1649 1650 dprintk("--> nfs4_create_referral_server()\n"); 1651 1652 server = nfs_alloc_server(); 1653 if (!server) 1654 return ERR_PTR(-ENOMEM); 1655 1656 parent_server = NFS_SB(data->sb); 1657 parent_client = parent_server->nfs_client; 1658 1659 /* Initialise the client representation from the parent server */ 1660 nfs_server_copy_userdata(server, parent_server); 1661 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1662 1663 /* Get a client representation. 1664 * Note: NFSv4 always uses TCP, */ 1665 error = nfs4_set_client(server, data->hostname, 1666 data->addr, 1667 data->addrlen, 1668 parent_client->cl_ipaddr, 1669 data->authflavor, 1670 parent_server->client->cl_xprt->prot, 1671 parent_server->client->cl_timeout, 1672 parent_client->cl_mvops->minor_version); 1673 if (error < 0) 1674 goto error; 1675 1676 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1677 if (error < 0) 1678 goto error; 1679 1680 error = nfs4_server_common_setup(server, mntfh); 1681 if (error < 0) 1682 goto error; 1683 1684 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1685 return server; 1686 1687 error: 1688 nfs_free_server(server); 1689 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1690 return ERR_PTR(error); 1691 } 1692 1693 #endif /* CONFIG_NFS_V4 */ 1694 1695 /* 1696 * Clone an NFS2, NFS3 or NFS4 server record 1697 */ 1698 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1699 struct nfs_fh *fh, 1700 struct nfs_fattr *fattr) 1701 { 1702 struct nfs_server *server; 1703 struct nfs_fattr *fattr_fsinfo; 1704 int error; 1705 1706 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1707 (unsigned long long) fattr->fsid.major, 1708 (unsigned long long) fattr->fsid.minor); 1709 1710 server = nfs_alloc_server(); 1711 if (!server) 1712 return ERR_PTR(-ENOMEM); 1713 1714 error = -ENOMEM; 1715 fattr_fsinfo = nfs_alloc_fattr(); 1716 if (fattr_fsinfo == NULL) 1717 goto out_free_server; 1718 1719 /* Copy data from the source */ 1720 server->nfs_client = source->nfs_client; 1721 atomic_inc(&server->nfs_client->cl_count); 1722 nfs_server_copy_userdata(server, source); 1723 1724 server->fsid = fattr->fsid; 1725 1726 error = nfs_init_server_rpcclient(server, 1727 source->client->cl_timeout, 1728 source->client->cl_auth->au_flavor); 1729 if (error < 0) 1730 goto out_free_server; 1731 if (!IS_ERR(source->client_acl)) 1732 nfs_init_server_aclclient(server); 1733 1734 /* probe the filesystem info for this server filesystem */ 1735 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1736 if (error < 0) 1737 goto out_free_server; 1738 1739 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1740 server->namelen = NFS4_MAXNAMLEN; 1741 1742 dprintk("Cloned FSID: %llx:%llx\n", 1743 (unsigned long long) server->fsid.major, 1744 (unsigned long long) server->fsid.minor); 1745 1746 error = nfs_start_lockd(server); 1747 if (error < 0) 1748 goto out_free_server; 1749 1750 nfs_server_insert_lists(server); 1751 server->mount_time = jiffies; 1752 1753 nfs_free_fattr(fattr_fsinfo); 1754 dprintk("<-- nfs_clone_server() = %p\n", server); 1755 return server; 1756 1757 out_free_server: 1758 nfs_free_fattr(fattr_fsinfo); 1759 nfs_free_server(server); 1760 dprintk("<-- nfs_clone_server() = error %d\n", error); 1761 return ERR_PTR(error); 1762 } 1763 1764 #ifdef CONFIG_PROC_FS 1765 static struct proc_dir_entry *proc_fs_nfs; 1766 1767 static int nfs_server_list_open(struct inode *inode, struct file *file); 1768 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1769 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1770 static void nfs_server_list_stop(struct seq_file *p, void *v); 1771 static int nfs_server_list_show(struct seq_file *m, void *v); 1772 1773 static const struct seq_operations nfs_server_list_ops = { 1774 .start = nfs_server_list_start, 1775 .next = nfs_server_list_next, 1776 .stop = nfs_server_list_stop, 1777 .show = nfs_server_list_show, 1778 }; 1779 1780 static const struct file_operations nfs_server_list_fops = { 1781 .open = nfs_server_list_open, 1782 .read = seq_read, 1783 .llseek = seq_lseek, 1784 .release = seq_release, 1785 .owner = THIS_MODULE, 1786 }; 1787 1788 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1789 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1790 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1791 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1792 static int nfs_volume_list_show(struct seq_file *m, void *v); 1793 1794 static const struct seq_operations nfs_volume_list_ops = { 1795 .start = nfs_volume_list_start, 1796 .next = nfs_volume_list_next, 1797 .stop = nfs_volume_list_stop, 1798 .show = nfs_volume_list_show, 1799 }; 1800 1801 static const struct file_operations nfs_volume_list_fops = { 1802 .open = nfs_volume_list_open, 1803 .read = seq_read, 1804 .llseek = seq_lseek, 1805 .release = seq_release, 1806 .owner = THIS_MODULE, 1807 }; 1808 1809 /* 1810 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1811 * we're dealing 1812 */ 1813 static int nfs_server_list_open(struct inode *inode, struct file *file) 1814 { 1815 struct seq_file *m; 1816 int ret; 1817 1818 ret = seq_open(file, &nfs_server_list_ops); 1819 if (ret < 0) 1820 return ret; 1821 1822 m = file->private_data; 1823 m->private = PDE(inode)->data; 1824 1825 return 0; 1826 } 1827 1828 /* 1829 * set up the iterator to start reading from the server list and return the first item 1830 */ 1831 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1832 { 1833 /* lock the list against modification */ 1834 spin_lock(&nfs_client_lock); 1835 return seq_list_start_head(&nfs_client_list, *_pos); 1836 } 1837 1838 /* 1839 * move to next server 1840 */ 1841 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1842 { 1843 return seq_list_next(v, &nfs_client_list, pos); 1844 } 1845 1846 /* 1847 * clean up after reading from the transports list 1848 */ 1849 static void nfs_server_list_stop(struct seq_file *p, void *v) 1850 { 1851 spin_unlock(&nfs_client_lock); 1852 } 1853 1854 /* 1855 * display a header line followed by a load of call lines 1856 */ 1857 static int nfs_server_list_show(struct seq_file *m, void *v) 1858 { 1859 struct nfs_client *clp; 1860 1861 /* display header on line 1 */ 1862 if (v == &nfs_client_list) { 1863 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1864 return 0; 1865 } 1866 1867 /* display one transport per line on subsequent lines */ 1868 clp = list_entry(v, struct nfs_client, cl_share_link); 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