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", 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 #if defined(CONFIG_NFS_V4_1) 192 INIT_LIST_HEAD(&clp->cl_layouts); 193 #endif 194 nfs_fscache_get_client_cookie(clp); 195 196 return clp; 197 198 error_cleanup: 199 kfree(clp); 200 error_0: 201 return ERR_PTR(err); 202 } 203 204 #ifdef CONFIG_NFS_V4 205 #ifdef CONFIG_NFS_V4_1 206 static void nfs4_shutdown_session(struct nfs_client *clp) 207 { 208 if (nfs4_has_session(clp)) 209 nfs4_destroy_session(clp->cl_session); 210 } 211 #else /* CONFIG_NFS_V4_1 */ 212 static void nfs4_shutdown_session(struct nfs_client *clp) 213 { 214 } 215 #endif /* CONFIG_NFS_V4_1 */ 216 217 /* 218 * Destroy the NFS4 callback service 219 */ 220 static void nfs4_destroy_callback(struct nfs_client *clp) 221 { 222 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 223 nfs_callback_down(clp->cl_mvops->minor_version); 224 } 225 226 static void nfs4_shutdown_client(struct nfs_client *clp) 227 { 228 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 229 nfs4_kill_renewd(clp); 230 nfs4_shutdown_session(clp); 231 nfs4_destroy_callback(clp); 232 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 233 nfs_idmap_delete(clp); 234 235 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 236 } 237 238 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 239 void nfs_cleanup_cb_ident_idr(void) 240 { 241 idr_destroy(&cb_ident_idr); 242 } 243 244 /* nfs_client_lock held */ 245 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 246 { 247 if (clp->cl_cb_ident) 248 idr_remove(&cb_ident_idr, clp->cl_cb_ident); 249 } 250 251 static void pnfs_init_server(struct nfs_server *server) 252 { 253 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 254 } 255 256 #else 257 static void nfs4_shutdown_client(struct nfs_client *clp) 258 { 259 } 260 261 void nfs_cleanup_cb_ident_idr(void) 262 { 263 } 264 265 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 266 { 267 } 268 269 static void pnfs_init_server(struct nfs_server *server) 270 { 271 } 272 273 #endif /* CONFIG_NFS_V4 */ 274 275 /* 276 * Destroy a shared client record 277 */ 278 static void nfs_free_client(struct nfs_client *clp) 279 { 280 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 281 282 nfs4_shutdown_client(clp); 283 284 nfs_fscache_release_client_cookie(clp); 285 286 /* -EIO all pending I/O */ 287 if (!IS_ERR(clp->cl_rpcclient)) 288 rpc_shutdown_client(clp->cl_rpcclient); 289 290 if (clp->cl_machine_cred != NULL) 291 put_rpccred(clp->cl_machine_cred); 292 293 kfree(clp->cl_hostname); 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, struct nfs_fsinfo *fsinfo) 908 { 909 unsigned long max_rpc_payload; 910 911 /* Work out a lot of parameters */ 912 if (server->rsize == 0) 913 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 914 if (server->wsize == 0) 915 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 916 917 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 918 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 919 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 920 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 921 922 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 923 if (server->rsize > max_rpc_payload) 924 server->rsize = max_rpc_payload; 925 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 926 server->rsize = NFS_MAX_FILE_IO_SIZE; 927 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 928 929 server->backing_dev_info.name = "nfs"; 930 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 931 932 if (server->wsize > max_rpc_payload) 933 server->wsize = max_rpc_payload; 934 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 935 server->wsize = NFS_MAX_FILE_IO_SIZE; 936 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 937 set_pnfs_layoutdriver(server, fsinfo->layouttype); 938 939 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 940 941 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 942 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 943 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 944 if (server->dtsize > server->rsize) 945 server->dtsize = server->rsize; 946 947 if (server->flags & NFS_MOUNT_NOAC) { 948 server->acregmin = server->acregmax = 0; 949 server->acdirmin = server->acdirmax = 0; 950 } 951 952 server->maxfilesize = fsinfo->maxfilesize; 953 954 server->time_delta = fsinfo->time_delta; 955 956 /* We're airborne Set socket buffersize */ 957 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 958 } 959 960 /* 961 * Probe filesystem information, including the FSID on v2/v3 962 */ 963 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 964 { 965 struct nfs_fsinfo fsinfo; 966 struct nfs_client *clp = server->nfs_client; 967 int error; 968 969 dprintk("--> nfs_probe_fsinfo()\n"); 970 971 if (clp->rpc_ops->set_capabilities != NULL) { 972 error = clp->rpc_ops->set_capabilities(server, mntfh); 973 if (error < 0) 974 goto out_error; 975 } 976 977 fsinfo.fattr = fattr; 978 fsinfo.layouttype = 0; 979 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 980 if (error < 0) 981 goto out_error; 982 983 nfs_server_set_fsinfo(server, &fsinfo); 984 985 /* Get some general file system info */ 986 if (server->namelen == 0) { 987 struct nfs_pathconf pathinfo; 988 989 pathinfo.fattr = fattr; 990 nfs_fattr_init(fattr); 991 992 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 993 server->namelen = pathinfo.max_namelen; 994 } 995 996 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 997 return 0; 998 999 out_error: 1000 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1001 return error; 1002 } 1003 1004 /* 1005 * Copy useful information when duplicating a server record 1006 */ 1007 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1008 { 1009 target->flags = source->flags; 1010 target->rsize = source->rsize; 1011 target->wsize = source->wsize; 1012 target->acregmin = source->acregmin; 1013 target->acregmax = source->acregmax; 1014 target->acdirmin = source->acdirmin; 1015 target->acdirmax = source->acdirmax; 1016 target->caps = source->caps; 1017 target->options = source->options; 1018 } 1019 1020 static void nfs_server_insert_lists(struct nfs_server *server) 1021 { 1022 struct nfs_client *clp = server->nfs_client; 1023 1024 spin_lock(&nfs_client_lock); 1025 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1026 list_add_tail(&server->master_link, &nfs_volume_list); 1027 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1028 spin_unlock(&nfs_client_lock); 1029 1030 } 1031 1032 static void nfs_server_remove_lists(struct nfs_server *server) 1033 { 1034 struct nfs_client *clp = server->nfs_client; 1035 1036 spin_lock(&nfs_client_lock); 1037 list_del_rcu(&server->client_link); 1038 if (clp && list_empty(&clp->cl_superblocks)) 1039 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1040 list_del(&server->master_link); 1041 spin_unlock(&nfs_client_lock); 1042 1043 synchronize_rcu(); 1044 } 1045 1046 /* 1047 * Allocate and initialise a server record 1048 */ 1049 static struct nfs_server *nfs_alloc_server(void) 1050 { 1051 struct nfs_server *server; 1052 1053 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1054 if (!server) 1055 return NULL; 1056 1057 server->client = server->client_acl = ERR_PTR(-EINVAL); 1058 1059 /* Zero out the NFS state stuff */ 1060 INIT_LIST_HEAD(&server->client_link); 1061 INIT_LIST_HEAD(&server->master_link); 1062 INIT_LIST_HEAD(&server->delegations); 1063 1064 atomic_set(&server->active, 0); 1065 1066 server->io_stats = nfs_alloc_iostats(); 1067 if (!server->io_stats) { 1068 kfree(server); 1069 return NULL; 1070 } 1071 1072 if (bdi_init(&server->backing_dev_info)) { 1073 nfs_free_iostats(server->io_stats); 1074 kfree(server); 1075 return NULL; 1076 } 1077 1078 pnfs_init_server(server); 1079 1080 return server; 1081 } 1082 1083 /* 1084 * Free up a server record 1085 */ 1086 void nfs_free_server(struct nfs_server *server) 1087 { 1088 dprintk("--> nfs_free_server()\n"); 1089 1090 nfs_server_remove_lists(server); 1091 unset_pnfs_layoutdriver(server); 1092 1093 if (server->destroy != NULL) 1094 server->destroy(server); 1095 1096 if (!IS_ERR(server->client_acl)) 1097 rpc_shutdown_client(server->client_acl); 1098 if (!IS_ERR(server->client)) 1099 rpc_shutdown_client(server->client); 1100 1101 nfs_put_client(server->nfs_client); 1102 1103 nfs_free_iostats(server->io_stats); 1104 bdi_destroy(&server->backing_dev_info); 1105 kfree(server); 1106 nfs_release_automount_timer(); 1107 dprintk("<-- nfs_free_server()\n"); 1108 } 1109 1110 /* 1111 * Create a version 2 or 3 volume record 1112 * - keyed on server and FSID 1113 */ 1114 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1115 struct nfs_fh *mntfh) 1116 { 1117 struct nfs_server *server; 1118 struct nfs_fattr *fattr; 1119 int error; 1120 1121 server = nfs_alloc_server(); 1122 if (!server) 1123 return ERR_PTR(-ENOMEM); 1124 1125 error = -ENOMEM; 1126 fattr = nfs_alloc_fattr(); 1127 if (fattr == NULL) 1128 goto error; 1129 1130 /* Get a client representation */ 1131 error = nfs_init_server(server, data); 1132 if (error < 0) 1133 goto error; 1134 1135 BUG_ON(!server->nfs_client); 1136 BUG_ON(!server->nfs_client->rpc_ops); 1137 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1138 1139 /* Probe the root fh to retrieve its FSID */ 1140 error = nfs_probe_fsinfo(server, mntfh, fattr); 1141 if (error < 0) 1142 goto error; 1143 if (server->nfs_client->rpc_ops->version == 3) { 1144 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1145 server->namelen = NFS3_MAXNAMLEN; 1146 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1147 server->caps |= NFS_CAP_READDIRPLUS; 1148 } else { 1149 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1150 server->namelen = NFS2_MAXNAMLEN; 1151 } 1152 1153 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1154 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1155 if (error < 0) { 1156 dprintk("nfs_create_server: getattr error = %d\n", -error); 1157 goto error; 1158 } 1159 } 1160 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1161 1162 dprintk("Server FSID: %llx:%llx\n", 1163 (unsigned long long) server->fsid.major, 1164 (unsigned long long) server->fsid.minor); 1165 1166 nfs_server_insert_lists(server); 1167 server->mount_time = jiffies; 1168 nfs_free_fattr(fattr); 1169 return server; 1170 1171 error: 1172 nfs_free_fattr(fattr); 1173 nfs_free_server(server); 1174 return ERR_PTR(error); 1175 } 1176 1177 #ifdef CONFIG_NFS_V4 1178 /* 1179 * NFSv4.0 callback thread helper 1180 * 1181 * Find a client by IP address, protocol version, and minorversion 1182 * 1183 * Called from the pg_authenticate method. The callback identifier 1184 * is not used as it has not been decoded. 1185 * 1186 * Returns NULL if no such client 1187 */ 1188 struct nfs_client * 1189 nfs4_find_client_no_ident(const struct sockaddr *addr) 1190 { 1191 struct nfs_client *clp; 1192 1193 spin_lock(&nfs_client_lock); 1194 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1195 if (nfs4_cb_match_client(addr, clp, 0) == false) 1196 continue; 1197 atomic_inc(&clp->cl_count); 1198 spin_unlock(&nfs_client_lock); 1199 return clp; 1200 } 1201 spin_unlock(&nfs_client_lock); 1202 return NULL; 1203 } 1204 1205 /* 1206 * NFSv4.0 callback thread helper 1207 * 1208 * Find a client by callback identifier 1209 */ 1210 struct nfs_client * 1211 nfs4_find_client_ident(int cb_ident) 1212 { 1213 struct nfs_client *clp; 1214 1215 spin_lock(&nfs_client_lock); 1216 clp = idr_find(&cb_ident_idr, cb_ident); 1217 if (clp) 1218 atomic_inc(&clp->cl_count); 1219 spin_unlock(&nfs_client_lock); 1220 return clp; 1221 } 1222 1223 #if defined(CONFIG_NFS_V4_1) 1224 /* 1225 * NFSv4.1 callback thread helper 1226 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1227 * minorversion, and sessionID 1228 * 1229 * Returns NULL if no such client 1230 */ 1231 struct nfs_client * 1232 nfs4_find_client_sessionid(const struct sockaddr *addr, 1233 struct nfs4_sessionid *sid) 1234 { 1235 struct nfs_client *clp; 1236 1237 spin_lock(&nfs_client_lock); 1238 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1239 if (nfs4_cb_match_client(addr, clp, 1) == false) 1240 continue; 1241 1242 if (!nfs4_has_session(clp)) 1243 continue; 1244 1245 /* Match sessionid*/ 1246 if (memcmp(clp->cl_session->sess_id.data, 1247 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1248 continue; 1249 1250 atomic_inc(&clp->cl_count); 1251 spin_unlock(&nfs_client_lock); 1252 return clp; 1253 } 1254 spin_unlock(&nfs_client_lock); 1255 return NULL; 1256 } 1257 1258 #else /* CONFIG_NFS_V4_1 */ 1259 1260 struct nfs_client * 1261 nfs4_find_client_sessionid(const struct sockaddr *addr, 1262 struct nfs4_sessionid *sid) 1263 { 1264 return NULL; 1265 } 1266 #endif /* CONFIG_NFS_V4_1 */ 1267 1268 /* 1269 * Initialize the NFS4 callback service 1270 */ 1271 static int nfs4_init_callback(struct nfs_client *clp) 1272 { 1273 int error; 1274 1275 if (clp->rpc_ops->version == 4) { 1276 if (nfs4_has_session(clp)) { 1277 error = xprt_setup_backchannel( 1278 clp->cl_rpcclient->cl_xprt, 1279 NFS41_BC_MIN_CALLBACKS); 1280 if (error < 0) 1281 return error; 1282 } 1283 1284 error = nfs_callback_up(clp->cl_mvops->minor_version, 1285 clp->cl_rpcclient->cl_xprt); 1286 if (error < 0) { 1287 dprintk("%s: failed to start callback. Error = %d\n", 1288 __func__, error); 1289 return error; 1290 } 1291 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1292 } 1293 return 0; 1294 } 1295 1296 /* 1297 * Initialize the minor version specific parts of an NFS4 client record 1298 */ 1299 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1300 { 1301 #if defined(CONFIG_NFS_V4_1) 1302 if (clp->cl_mvops->minor_version) { 1303 struct nfs4_session *session = NULL; 1304 /* 1305 * Create the session and mark it expired. 1306 * When a SEQUENCE operation encounters the expired session 1307 * it will do session recovery to initialize it. 1308 */ 1309 session = nfs4_alloc_session(clp); 1310 if (!session) 1311 return -ENOMEM; 1312 1313 clp->cl_session = session; 1314 /* 1315 * The create session reply races with the server back 1316 * channel probe. Mark the client NFS_CS_SESSION_INITING 1317 * so that the client back channel can find the 1318 * nfs_client struct 1319 */ 1320 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1321 } 1322 #endif /* CONFIG_NFS_V4_1 */ 1323 1324 return nfs4_init_callback(clp); 1325 } 1326 1327 /* 1328 * Initialise an NFS4 client record 1329 */ 1330 int nfs4_init_client(struct nfs_client *clp, 1331 const struct rpc_timeout *timeparms, 1332 const char *ip_addr, 1333 rpc_authflavor_t authflavour, 1334 int noresvport) 1335 { 1336 int error; 1337 1338 if (clp->cl_cons_state == NFS_CS_READY) { 1339 /* the client is initialised already */ 1340 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1341 return 0; 1342 } 1343 1344 /* Check NFS protocol revision and initialize RPC op vector */ 1345 clp->rpc_ops = &nfs_v4_clientops; 1346 1347 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1348 1, noresvport); 1349 if (error < 0) 1350 goto error; 1351 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1352 1353 error = nfs_idmap_new(clp); 1354 if (error < 0) { 1355 dprintk("%s: failed to create idmapper. Error = %d\n", 1356 __func__, error); 1357 goto error; 1358 } 1359 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1360 1361 error = nfs4_init_client_minor_version(clp); 1362 if (error < 0) 1363 goto error; 1364 1365 if (!nfs4_has_session(clp)) 1366 nfs_mark_client_ready(clp, NFS_CS_READY); 1367 return 0; 1368 1369 error: 1370 nfs_mark_client_ready(clp, error); 1371 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1372 return error; 1373 } 1374 1375 /* 1376 * Set up an NFS4 client 1377 */ 1378 static int nfs4_set_client(struct nfs_server *server, 1379 const char *hostname, 1380 const struct sockaddr *addr, 1381 const size_t addrlen, 1382 const char *ip_addr, 1383 rpc_authflavor_t authflavour, 1384 int proto, const struct rpc_timeout *timeparms, 1385 u32 minorversion) 1386 { 1387 struct nfs_client_initdata cl_init = { 1388 .hostname = hostname, 1389 .addr = addr, 1390 .addrlen = addrlen, 1391 .rpc_ops = &nfs_v4_clientops, 1392 .proto = proto, 1393 .minorversion = minorversion, 1394 }; 1395 struct nfs_client *clp; 1396 int error; 1397 1398 dprintk("--> nfs4_set_client()\n"); 1399 1400 /* Allocate or find a client reference we can use */ 1401 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1402 server->flags & NFS_MOUNT_NORESVPORT); 1403 if (IS_ERR(clp)) { 1404 error = PTR_ERR(clp); 1405 goto error; 1406 } 1407 1408 /* 1409 * Query for the lease time on clientid setup or renewal 1410 * 1411 * Note that this will be set on nfs_clients that were created 1412 * only for the DS role and did not set this bit, but now will 1413 * serve a dual role. 1414 */ 1415 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1416 1417 server->nfs_client = clp; 1418 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1419 return 0; 1420 error: 1421 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1422 return error; 1423 } 1424 1425 /* 1426 * Set up a pNFS Data Server client. 1427 * 1428 * Return any existing nfs_client that matches server address,port,version 1429 * and minorversion. 1430 * 1431 * For a new nfs_client, use a soft mount (default), a low retrans and a 1432 * low timeout interval so that if a connection is lost, we retry through 1433 * the MDS. 1434 */ 1435 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1436 const struct sockaddr *ds_addr, 1437 int ds_addrlen, int ds_proto) 1438 { 1439 struct nfs_client_initdata cl_init = { 1440 .addr = ds_addr, 1441 .addrlen = ds_addrlen, 1442 .rpc_ops = &nfs_v4_clientops, 1443 .proto = ds_proto, 1444 .minorversion = mds_clp->cl_minorversion, 1445 }; 1446 struct rpc_timeout ds_timeout = { 1447 .to_initval = 15 * HZ, 1448 .to_maxval = 15 * HZ, 1449 .to_retries = 1, 1450 .to_exponential = 1, 1451 }; 1452 struct nfs_client *clp; 1453 1454 /* 1455 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1456 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1457 * (section 13.1 RFC 5661). 1458 */ 1459 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1460 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1461 1462 dprintk("<-- %s %p\n", __func__, clp); 1463 return clp; 1464 } 1465 EXPORT_SYMBOL(nfs4_set_ds_client); 1466 1467 /* 1468 * Session has been established, and the client marked ready. 1469 * Set the mount rsize and wsize with negotiated fore channel 1470 * attributes which will be bound checked in nfs_server_set_fsinfo. 1471 */ 1472 static void nfs4_session_set_rwsize(struct nfs_server *server) 1473 { 1474 #ifdef CONFIG_NFS_V4_1 1475 struct nfs4_session *sess; 1476 u32 server_resp_sz; 1477 u32 server_rqst_sz; 1478 1479 if (!nfs4_has_session(server->nfs_client)) 1480 return; 1481 sess = server->nfs_client->cl_session; 1482 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1483 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1484 1485 if (server->rsize > server_resp_sz) 1486 server->rsize = server_resp_sz; 1487 if (server->wsize > server_rqst_sz) 1488 server->wsize = server_rqst_sz; 1489 #endif /* CONFIG_NFS_V4_1 */ 1490 } 1491 1492 static int nfs4_server_common_setup(struct nfs_server *server, 1493 struct nfs_fh *mntfh) 1494 { 1495 struct nfs_fattr *fattr; 1496 int error; 1497 1498 BUG_ON(!server->nfs_client); 1499 BUG_ON(!server->nfs_client->rpc_ops); 1500 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1501 1502 /* data servers support only a subset of NFSv4.1 */ 1503 if (is_ds_only_client(server->nfs_client)) 1504 return -EPROTONOSUPPORT; 1505 1506 fattr = nfs_alloc_fattr(); 1507 if (fattr == NULL) 1508 return -ENOMEM; 1509 1510 /* We must ensure the session is initialised first */ 1511 error = nfs4_init_session(server); 1512 if (error < 0) 1513 goto out; 1514 1515 /* Probe the root fh to retrieve its FSID and filehandle */ 1516 error = nfs4_get_rootfh(server, mntfh); 1517 if (error < 0) 1518 goto out; 1519 1520 dprintk("Server FSID: %llx:%llx\n", 1521 (unsigned long long) server->fsid.major, 1522 (unsigned long long) server->fsid.minor); 1523 dprintk("Mount FH: %d\n", mntfh->size); 1524 1525 nfs4_session_set_rwsize(server); 1526 1527 error = nfs_probe_fsinfo(server, mntfh, fattr); 1528 if (error < 0) 1529 goto out; 1530 1531 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1532 server->namelen = NFS4_MAXNAMLEN; 1533 1534 nfs_server_insert_lists(server); 1535 server->mount_time = jiffies; 1536 out: 1537 nfs_free_fattr(fattr); 1538 return error; 1539 } 1540 1541 /* 1542 * Create a version 4 volume record 1543 */ 1544 static int nfs4_init_server(struct nfs_server *server, 1545 const struct nfs_parsed_mount_data *data) 1546 { 1547 struct rpc_timeout timeparms; 1548 int error; 1549 1550 dprintk("--> nfs4_init_server()\n"); 1551 1552 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1553 data->timeo, data->retrans); 1554 1555 /* Initialise the client representation from the mount data */ 1556 server->flags = data->flags; 1557 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1558 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1559 server->caps |= NFS_CAP_READDIRPLUS; 1560 server->options = data->options; 1561 1562 /* Get a client record */ 1563 error = nfs4_set_client(server, 1564 data->nfs_server.hostname, 1565 (const struct sockaddr *)&data->nfs_server.address, 1566 data->nfs_server.addrlen, 1567 data->client_address, 1568 data->auth_flavors[0], 1569 data->nfs_server.protocol, 1570 &timeparms, 1571 data->minorversion); 1572 if (error < 0) 1573 goto error; 1574 1575 /* 1576 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1577 * authentication. 1578 */ 1579 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1580 server->caps |= NFS_CAP_UIDGID_NOMAP; 1581 1582 if (data->rsize) 1583 server->rsize = nfs_block_size(data->rsize, NULL); 1584 if (data->wsize) 1585 server->wsize = nfs_block_size(data->wsize, NULL); 1586 1587 server->acregmin = data->acregmin * HZ; 1588 server->acregmax = data->acregmax * HZ; 1589 server->acdirmin = data->acdirmin * HZ; 1590 server->acdirmax = data->acdirmax * HZ; 1591 1592 server->port = data->nfs_server.port; 1593 1594 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1595 1596 error: 1597 /* Done */ 1598 dprintk("<-- nfs4_init_server() = %d\n", error); 1599 return error; 1600 } 1601 1602 /* 1603 * Create a version 4 volume record 1604 * - keyed on server and FSID 1605 */ 1606 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1607 struct nfs_fh *mntfh) 1608 { 1609 struct nfs_server *server; 1610 int error; 1611 1612 dprintk("--> nfs4_create_server()\n"); 1613 1614 server = nfs_alloc_server(); 1615 if (!server) 1616 return ERR_PTR(-ENOMEM); 1617 1618 /* set up the general RPC client */ 1619 error = nfs4_init_server(server, data); 1620 if (error < 0) 1621 goto error; 1622 1623 error = nfs4_server_common_setup(server, mntfh); 1624 if (error < 0) 1625 goto error; 1626 1627 dprintk("<-- nfs4_create_server() = %p\n", server); 1628 return server; 1629 1630 error: 1631 nfs_free_server(server); 1632 dprintk("<-- nfs4_create_server() = error %d\n", error); 1633 return ERR_PTR(error); 1634 } 1635 1636 /* 1637 * Create an NFS4 referral server record 1638 */ 1639 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1640 struct nfs_fh *mntfh) 1641 { 1642 struct nfs_client *parent_client; 1643 struct nfs_server *server, *parent_server; 1644 int error; 1645 1646 dprintk("--> nfs4_create_referral_server()\n"); 1647 1648 server = nfs_alloc_server(); 1649 if (!server) 1650 return ERR_PTR(-ENOMEM); 1651 1652 parent_server = NFS_SB(data->sb); 1653 parent_client = parent_server->nfs_client; 1654 1655 /* Initialise the client representation from the parent server */ 1656 nfs_server_copy_userdata(server, parent_server); 1657 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1658 1659 /* Get a client representation. 1660 * Note: NFSv4 always uses TCP, */ 1661 error = nfs4_set_client(server, data->hostname, 1662 data->addr, 1663 data->addrlen, 1664 parent_client->cl_ipaddr, 1665 data->authflavor, 1666 parent_server->client->cl_xprt->prot, 1667 parent_server->client->cl_timeout, 1668 parent_client->cl_mvops->minor_version); 1669 if (error < 0) 1670 goto error; 1671 1672 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1673 if (error < 0) 1674 goto error; 1675 1676 error = nfs4_server_common_setup(server, mntfh); 1677 if (error < 0) 1678 goto error; 1679 1680 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1681 return server; 1682 1683 error: 1684 nfs_free_server(server); 1685 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1686 return ERR_PTR(error); 1687 } 1688 1689 #endif /* CONFIG_NFS_V4 */ 1690 1691 /* 1692 * Clone an NFS2, NFS3 or NFS4 server record 1693 */ 1694 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1695 struct nfs_fh *fh, 1696 struct nfs_fattr *fattr) 1697 { 1698 struct nfs_server *server; 1699 struct nfs_fattr *fattr_fsinfo; 1700 int error; 1701 1702 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1703 (unsigned long long) fattr->fsid.major, 1704 (unsigned long long) fattr->fsid.minor); 1705 1706 server = nfs_alloc_server(); 1707 if (!server) 1708 return ERR_PTR(-ENOMEM); 1709 1710 error = -ENOMEM; 1711 fattr_fsinfo = nfs_alloc_fattr(); 1712 if (fattr_fsinfo == NULL) 1713 goto out_free_server; 1714 1715 /* Copy data from the source */ 1716 server->nfs_client = source->nfs_client; 1717 atomic_inc(&server->nfs_client->cl_count); 1718 nfs_server_copy_userdata(server, source); 1719 1720 server->fsid = fattr->fsid; 1721 1722 error = nfs_init_server_rpcclient(server, 1723 source->client->cl_timeout, 1724 source->client->cl_auth->au_flavor); 1725 if (error < 0) 1726 goto out_free_server; 1727 if (!IS_ERR(source->client_acl)) 1728 nfs_init_server_aclclient(server); 1729 1730 /* probe the filesystem info for this server filesystem */ 1731 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1732 if (error < 0) 1733 goto out_free_server; 1734 1735 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1736 server->namelen = NFS4_MAXNAMLEN; 1737 1738 dprintk("Cloned FSID: %llx:%llx\n", 1739 (unsigned long long) server->fsid.major, 1740 (unsigned long long) server->fsid.minor); 1741 1742 error = nfs_start_lockd(server); 1743 if (error < 0) 1744 goto out_free_server; 1745 1746 nfs_server_insert_lists(server); 1747 server->mount_time = jiffies; 1748 1749 nfs_free_fattr(fattr_fsinfo); 1750 dprintk("<-- nfs_clone_server() = %p\n", server); 1751 return server; 1752 1753 out_free_server: 1754 nfs_free_fattr(fattr_fsinfo); 1755 nfs_free_server(server); 1756 dprintk("<-- nfs_clone_server() = error %d\n", error); 1757 return ERR_PTR(error); 1758 } 1759 1760 #ifdef CONFIG_PROC_FS 1761 static struct proc_dir_entry *proc_fs_nfs; 1762 1763 static int nfs_server_list_open(struct inode *inode, struct file *file); 1764 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1765 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1766 static void nfs_server_list_stop(struct seq_file *p, void *v); 1767 static int nfs_server_list_show(struct seq_file *m, void *v); 1768 1769 static const struct seq_operations nfs_server_list_ops = { 1770 .start = nfs_server_list_start, 1771 .next = nfs_server_list_next, 1772 .stop = nfs_server_list_stop, 1773 .show = nfs_server_list_show, 1774 }; 1775 1776 static const struct file_operations nfs_server_list_fops = { 1777 .open = nfs_server_list_open, 1778 .read = seq_read, 1779 .llseek = seq_lseek, 1780 .release = seq_release, 1781 .owner = THIS_MODULE, 1782 }; 1783 1784 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1785 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1786 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1787 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1788 static int nfs_volume_list_show(struct seq_file *m, void *v); 1789 1790 static const struct seq_operations nfs_volume_list_ops = { 1791 .start = nfs_volume_list_start, 1792 .next = nfs_volume_list_next, 1793 .stop = nfs_volume_list_stop, 1794 .show = nfs_volume_list_show, 1795 }; 1796 1797 static const struct file_operations nfs_volume_list_fops = { 1798 .open = nfs_volume_list_open, 1799 .read = seq_read, 1800 .llseek = seq_lseek, 1801 .release = seq_release, 1802 .owner = THIS_MODULE, 1803 }; 1804 1805 /* 1806 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1807 * we're dealing 1808 */ 1809 static int nfs_server_list_open(struct inode *inode, struct file *file) 1810 { 1811 struct seq_file *m; 1812 int ret; 1813 1814 ret = seq_open(file, &nfs_server_list_ops); 1815 if (ret < 0) 1816 return ret; 1817 1818 m = file->private_data; 1819 m->private = PDE(inode)->data; 1820 1821 return 0; 1822 } 1823 1824 /* 1825 * set up the iterator to start reading from the server list and return the first item 1826 */ 1827 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1828 { 1829 /* lock the list against modification */ 1830 spin_lock(&nfs_client_lock); 1831 return seq_list_start_head(&nfs_client_list, *_pos); 1832 } 1833 1834 /* 1835 * move to next server 1836 */ 1837 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1838 { 1839 return seq_list_next(v, &nfs_client_list, pos); 1840 } 1841 1842 /* 1843 * clean up after reading from the transports list 1844 */ 1845 static void nfs_server_list_stop(struct seq_file *p, void *v) 1846 { 1847 spin_unlock(&nfs_client_lock); 1848 } 1849 1850 /* 1851 * display a header line followed by a load of call lines 1852 */ 1853 static int nfs_server_list_show(struct seq_file *m, void *v) 1854 { 1855 struct nfs_client *clp; 1856 1857 /* display header on line 1 */ 1858 if (v == &nfs_client_list) { 1859 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1860 return 0; 1861 } 1862 1863 /* display one transport per line on subsequent lines */ 1864 clp = list_entry(v, struct nfs_client, cl_share_link); 1865 1866 seq_printf(m, "v%u %s %s %3d %s\n", 1867 clp->rpc_ops->version, 1868 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1869 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1870 atomic_read(&clp->cl_count), 1871 clp->cl_hostname); 1872 1873 return 0; 1874 } 1875 1876 /* 1877 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1878 */ 1879 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1880 { 1881 struct seq_file *m; 1882 int ret; 1883 1884 ret = seq_open(file, &nfs_volume_list_ops); 1885 if (ret < 0) 1886 return ret; 1887 1888 m = file->private_data; 1889 m->private = PDE(inode)->data; 1890 1891 return 0; 1892 } 1893 1894 /* 1895 * set up the iterator to start reading from the volume list and return the first item 1896 */ 1897 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1898 { 1899 /* lock the list against modification */ 1900 spin_lock(&nfs_client_lock); 1901 return seq_list_start_head(&nfs_volume_list, *_pos); 1902 } 1903 1904 /* 1905 * move to next volume 1906 */ 1907 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1908 { 1909 return seq_list_next(v, &nfs_volume_list, pos); 1910 } 1911 1912 /* 1913 * clean up after reading from the transports list 1914 */ 1915 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1916 { 1917 spin_unlock(&nfs_client_lock); 1918 } 1919 1920 /* 1921 * display a header line followed by a load of call lines 1922 */ 1923 static int nfs_volume_list_show(struct seq_file *m, void *v) 1924 { 1925 struct nfs_server *server; 1926 struct nfs_client *clp; 1927 char dev[8], fsid[17]; 1928 1929 /* display header on line 1 */ 1930 if (v == &nfs_volume_list) { 1931 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1932 return 0; 1933 } 1934 /* display one transport per line on subsequent lines */ 1935 server = list_entry(v, struct nfs_server, master_link); 1936 clp = server->nfs_client; 1937 1938 snprintf(dev, 8, "%u:%u", 1939 MAJOR(server->s_dev), MINOR(server->s_dev)); 1940 1941 snprintf(fsid, 17, "%llx:%llx", 1942 (unsigned long long) server->fsid.major, 1943 (unsigned long long) server->fsid.minor); 1944 1945 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1946 clp->rpc_ops->version, 1947 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1948 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1949 dev, 1950 fsid, 1951 nfs_server_fscache_state(server)); 1952 1953 return 0; 1954 } 1955 1956 /* 1957 * initialise the /proc/fs/nfsfs/ directory 1958 */ 1959 int __init nfs_fs_proc_init(void) 1960 { 1961 struct proc_dir_entry *p; 1962 1963 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1964 if (!proc_fs_nfs) 1965 goto error_0; 1966 1967 /* a file of servers with which we're dealing */ 1968 p = proc_create("servers", S_IFREG|S_IRUGO, 1969 proc_fs_nfs, &nfs_server_list_fops); 1970 if (!p) 1971 goto error_1; 1972 1973 /* a file of volumes that we have mounted */ 1974 p = proc_create("volumes", S_IFREG|S_IRUGO, 1975 proc_fs_nfs, &nfs_volume_list_fops); 1976 if (!p) 1977 goto error_2; 1978 return 0; 1979 1980 error_2: 1981 remove_proc_entry("servers", proc_fs_nfs); 1982 error_1: 1983 remove_proc_entry("fs/nfsfs", NULL); 1984 error_0: 1985 return -ENOMEM; 1986 } 1987 1988 /* 1989 * clean up the /proc/fs/nfsfs/ directory 1990 */ 1991 void nfs_fs_proc_exit(void) 1992 { 1993 remove_proc_entry("volumes", proc_fs_nfs); 1994 remove_proc_entry("servers", proc_fs_nfs); 1995 remove_proc_entry("fs/nfsfs", NULL); 1996 } 1997 1998 #endif /* CONFIG_PROC_FS */ 1999 2000 module_param(nfs4_disable_idmapping, bool, 0644); 2001 MODULE_PARM_DESC(nfs4_disable_idmapping, 2002 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2003