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