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 nfs4_deviceid_purge_client(clp); 294 295 kfree(clp->cl_hostname); 296 kfree(clp); 297 298 dprintk("<-- nfs_free_client()\n"); 299 } 300 301 /* 302 * Release a reference to a shared client record 303 */ 304 void nfs_put_client(struct nfs_client *clp) 305 { 306 if (!clp) 307 return; 308 309 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 310 311 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 312 list_del(&clp->cl_share_link); 313 nfs_cb_idr_remove_locked(clp); 314 spin_unlock(&nfs_client_lock); 315 316 BUG_ON(!list_empty(&clp->cl_superblocks)); 317 318 nfs_free_client(clp); 319 } 320 } 321 EXPORT_SYMBOL_GPL(nfs_put_client); 322 323 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 324 /* 325 * Test if two ip6 socket addresses refer to the same socket by 326 * comparing relevant fields. The padding bytes specifically, are not 327 * compared. sin6_flowinfo is not compared because it only affects QoS 328 * and sin6_scope_id is only compared if the address is "link local" 329 * because "link local" addresses need only be unique to a specific 330 * link. Conversely, ordinary unicast addresses might have different 331 * sin6_scope_id. 332 * 333 * The caller should ensure both socket addresses are AF_INET6. 334 */ 335 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 336 const struct sockaddr *sa2) 337 { 338 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 339 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 340 341 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 342 sin1->sin6_scope_id != sin2->sin6_scope_id) 343 return 0; 344 345 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); 346 } 347 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 348 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 349 const struct sockaddr *sa2) 350 { 351 return 0; 352 } 353 #endif 354 355 /* 356 * Test if two ip4 socket addresses refer to the same socket, by 357 * comparing relevant fields. The padding bytes specifically, are 358 * not compared. 359 * 360 * The caller should ensure both socket addresses are AF_INET. 361 */ 362 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 363 const struct sockaddr *sa2) 364 { 365 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 366 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 367 368 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 369 } 370 371 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 372 const struct sockaddr *sa2) 373 { 374 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 375 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 376 377 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 378 (sin1->sin6_port == sin2->sin6_port); 379 } 380 381 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 382 const struct sockaddr *sa2) 383 { 384 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 385 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 386 387 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 388 (sin1->sin_port == sin2->sin_port); 389 } 390 391 /* 392 * Test if two socket addresses represent the same actual socket, 393 * by comparing (only) relevant fields, excluding the port number. 394 */ 395 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 396 const struct sockaddr *sa2) 397 { 398 if (sa1->sa_family != sa2->sa_family) 399 return 0; 400 401 switch (sa1->sa_family) { 402 case AF_INET: 403 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 404 case AF_INET6: 405 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 406 } 407 return 0; 408 } 409 410 /* 411 * Test if two socket addresses represent the same actual socket, 412 * by comparing (only) relevant fields, including the port number. 413 */ 414 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 415 const struct sockaddr *sa2) 416 { 417 if (sa1->sa_family != sa2->sa_family) 418 return 0; 419 420 switch (sa1->sa_family) { 421 case AF_INET: 422 return nfs_sockaddr_cmp_ip4(sa1, sa2); 423 case AF_INET6: 424 return nfs_sockaddr_cmp_ip6(sa1, sa2); 425 } 426 return 0; 427 } 428 429 /* Common match routine for v4.0 and v4.1 callback services */ 430 bool 431 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, 432 u32 minorversion) 433 { 434 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 435 436 /* Don't match clients that failed to initialise */ 437 if (!(clp->cl_cons_state == NFS_CS_READY || 438 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 439 return false; 440 441 /* Match the version and minorversion */ 442 if (clp->rpc_ops->version != 4 || 443 clp->cl_minorversion != minorversion) 444 return false; 445 446 /* Match only the IP address, not the port number */ 447 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 448 return false; 449 450 return true; 451 } 452 453 /* 454 * Find an nfs_client on the list that matches the initialisation data 455 * that is supplied. 456 */ 457 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 458 { 459 struct nfs_client *clp; 460 const struct sockaddr *sap = data->addr; 461 462 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 463 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 464 /* Don't match clients that failed to initialise properly */ 465 if (clp->cl_cons_state < 0) 466 continue; 467 468 /* Different NFS versions cannot share the same nfs_client */ 469 if (clp->rpc_ops != data->rpc_ops) 470 continue; 471 472 if (clp->cl_proto != data->proto) 473 continue; 474 /* Match nfsv4 minorversion */ 475 if (clp->cl_minorversion != data->minorversion) 476 continue; 477 /* Match the full socket address */ 478 if (!nfs_sockaddr_cmp(sap, clap)) 479 continue; 480 481 atomic_inc(&clp->cl_count); 482 return clp; 483 } 484 return NULL; 485 } 486 487 /* 488 * Look up a client by IP address and protocol version 489 * - creates a new record if one doesn't yet exist 490 */ 491 static struct nfs_client * 492 nfs_get_client(const struct nfs_client_initdata *cl_init, 493 const struct rpc_timeout *timeparms, 494 const char *ip_addr, 495 rpc_authflavor_t authflavour, 496 int noresvport) 497 { 498 struct nfs_client *clp, *new = NULL; 499 int error; 500 501 dprintk("--> nfs_get_client(%s,v%u)\n", 502 cl_init->hostname ?: "", cl_init->rpc_ops->version); 503 504 /* see if the client already exists */ 505 do { 506 spin_lock(&nfs_client_lock); 507 508 clp = nfs_match_client(cl_init); 509 if (clp) 510 goto found_client; 511 if (new) 512 goto install_client; 513 514 spin_unlock(&nfs_client_lock); 515 516 new = nfs_alloc_client(cl_init); 517 } while (!IS_ERR(new)); 518 519 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 520 return new; 521 522 /* install a new client and return with it unready */ 523 install_client: 524 clp = new; 525 list_add(&clp->cl_share_link, &nfs_client_list); 526 spin_unlock(&nfs_client_lock); 527 528 error = cl_init->rpc_ops->init_client(clp, timeparms, ip_addr, 529 authflavour, noresvport); 530 if (error < 0) { 531 nfs_put_client(clp); 532 return ERR_PTR(error); 533 } 534 dprintk("--> nfs_get_client() = %p [new]\n", clp); 535 return clp; 536 537 /* found an existing client 538 * - make sure it's ready before returning 539 */ 540 found_client: 541 spin_unlock(&nfs_client_lock); 542 543 if (new) 544 nfs_free_client(new); 545 546 error = wait_event_killable(nfs_client_active_wq, 547 clp->cl_cons_state < NFS_CS_INITING); 548 if (error < 0) { 549 nfs_put_client(clp); 550 return ERR_PTR(-ERESTARTSYS); 551 } 552 553 if (clp->cl_cons_state < NFS_CS_READY) { 554 error = clp->cl_cons_state; 555 nfs_put_client(clp); 556 return ERR_PTR(error); 557 } 558 559 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 560 561 dprintk("--> nfs_get_client() = %p [share]\n", clp); 562 return clp; 563 } 564 565 /* 566 * Mark a server as ready or failed 567 */ 568 void nfs_mark_client_ready(struct nfs_client *clp, int state) 569 { 570 clp->cl_cons_state = state; 571 wake_up_all(&nfs_client_active_wq); 572 } 573 574 /* 575 * With sessions, the client is not marked ready until after a 576 * successful EXCHANGE_ID and CREATE_SESSION. 577 * 578 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 579 * other versions of NFS can be tried. 580 */ 581 int nfs4_check_client_ready(struct nfs_client *clp) 582 { 583 if (!nfs4_has_session(clp)) 584 return 0; 585 if (clp->cl_cons_state < NFS_CS_READY) 586 return -EPROTONOSUPPORT; 587 return 0; 588 } 589 590 /* 591 * Initialise the timeout values for a connection 592 */ 593 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 594 unsigned int timeo, unsigned int retrans) 595 { 596 to->to_initval = timeo * HZ / 10; 597 to->to_retries = retrans; 598 599 switch (proto) { 600 case XPRT_TRANSPORT_TCP: 601 case XPRT_TRANSPORT_RDMA: 602 if (to->to_retries == 0) 603 to->to_retries = NFS_DEF_TCP_RETRANS; 604 if (to->to_initval == 0) 605 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 606 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 607 to->to_initval = NFS_MAX_TCP_TIMEOUT; 608 to->to_increment = to->to_initval; 609 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 610 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 611 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 612 if (to->to_maxval < to->to_initval) 613 to->to_maxval = to->to_initval; 614 to->to_exponential = 0; 615 break; 616 case XPRT_TRANSPORT_UDP: 617 if (to->to_retries == 0) 618 to->to_retries = NFS_DEF_UDP_RETRANS; 619 if (!to->to_initval) 620 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 621 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 622 to->to_initval = NFS_MAX_UDP_TIMEOUT; 623 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 624 to->to_exponential = 1; 625 break; 626 default: 627 BUG(); 628 } 629 } 630 631 /* 632 * Create an RPC client handle 633 */ 634 static int nfs_create_rpc_client(struct nfs_client *clp, 635 const struct rpc_timeout *timeparms, 636 rpc_authflavor_t flavor, 637 int discrtry, int noresvport) 638 { 639 struct rpc_clnt *clnt = NULL; 640 struct rpc_create_args args = { 641 .net = &init_net, 642 .protocol = clp->cl_proto, 643 .address = (struct sockaddr *)&clp->cl_addr, 644 .addrsize = clp->cl_addrlen, 645 .timeout = timeparms, 646 .servername = clp->cl_hostname, 647 .program = &nfs_program, 648 .version = clp->rpc_ops->version, 649 .authflavor = flavor, 650 }; 651 652 if (discrtry) 653 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 654 if (noresvport) 655 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 656 657 if (!IS_ERR(clp->cl_rpcclient)) 658 return 0; 659 660 clnt = rpc_create(&args); 661 if (IS_ERR(clnt)) { 662 dprintk("%s: cannot create RPC client. Error = %ld\n", 663 __func__, PTR_ERR(clnt)); 664 return PTR_ERR(clnt); 665 } 666 667 clp->cl_rpcclient = clnt; 668 return 0; 669 } 670 671 /* 672 * Version 2 or 3 client destruction 673 */ 674 static void nfs_destroy_server(struct nfs_server *server) 675 { 676 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 677 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 678 nlmclnt_done(server->nlm_host); 679 } 680 681 /* 682 * Version 2 or 3 lockd setup 683 */ 684 static int nfs_start_lockd(struct nfs_server *server) 685 { 686 struct nlm_host *host; 687 struct nfs_client *clp = server->nfs_client; 688 struct nlmclnt_initdata nlm_init = { 689 .hostname = clp->cl_hostname, 690 .address = (struct sockaddr *)&clp->cl_addr, 691 .addrlen = clp->cl_addrlen, 692 .nfs_version = clp->rpc_ops->version, 693 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 694 1 : 0, 695 }; 696 697 if (nlm_init.nfs_version > 3) 698 return 0; 699 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 700 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 701 return 0; 702 703 switch (clp->cl_proto) { 704 default: 705 nlm_init.protocol = IPPROTO_TCP; 706 break; 707 case XPRT_TRANSPORT_UDP: 708 nlm_init.protocol = IPPROTO_UDP; 709 } 710 711 host = nlmclnt_init(&nlm_init); 712 if (IS_ERR(host)) 713 return PTR_ERR(host); 714 715 server->nlm_host = host; 716 server->destroy = nfs_destroy_server; 717 return 0; 718 } 719 720 /* 721 * Initialise an NFSv3 ACL client connection 722 */ 723 #ifdef CONFIG_NFS_V3_ACL 724 static void nfs_init_server_aclclient(struct nfs_server *server) 725 { 726 if (server->nfs_client->rpc_ops->version != 3) 727 goto out_noacl; 728 if (server->flags & NFS_MOUNT_NOACL) 729 goto out_noacl; 730 731 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 732 if (IS_ERR(server->client_acl)) 733 goto out_noacl; 734 735 /* No errors! Assume that Sun nfsacls are supported */ 736 server->caps |= NFS_CAP_ACLS; 737 return; 738 739 out_noacl: 740 server->caps &= ~NFS_CAP_ACLS; 741 } 742 #else 743 static inline void nfs_init_server_aclclient(struct nfs_server *server) 744 { 745 server->flags &= ~NFS_MOUNT_NOACL; 746 server->caps &= ~NFS_CAP_ACLS; 747 } 748 #endif 749 750 /* 751 * Create a general RPC client 752 */ 753 static int nfs_init_server_rpcclient(struct nfs_server *server, 754 const struct rpc_timeout *timeo, 755 rpc_authflavor_t pseudoflavour) 756 { 757 struct nfs_client *clp = server->nfs_client; 758 759 server->client = rpc_clone_client(clp->cl_rpcclient); 760 if (IS_ERR(server->client)) { 761 dprintk("%s: couldn't create rpc_client!\n", __func__); 762 return PTR_ERR(server->client); 763 } 764 765 memcpy(&server->client->cl_timeout_default, 766 timeo, 767 sizeof(server->client->cl_timeout_default)); 768 server->client->cl_timeout = &server->client->cl_timeout_default; 769 770 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 771 struct rpc_auth *auth; 772 773 auth = rpcauth_create(pseudoflavour, server->client); 774 if (IS_ERR(auth)) { 775 dprintk("%s: couldn't create credcache!\n", __func__); 776 return PTR_ERR(auth); 777 } 778 } 779 server->client->cl_softrtry = 0; 780 if (server->flags & NFS_MOUNT_SOFT) 781 server->client->cl_softrtry = 1; 782 783 return 0; 784 } 785 786 /* 787 * Initialise an NFS2 or NFS3 client 788 */ 789 int nfs_init_client(struct nfs_client *clp, const struct rpc_timeout *timeparms, 790 const char *ip_addr, rpc_authflavor_t authflavour, 791 int noresvport) 792 { 793 int error; 794 795 if (clp->cl_cons_state == NFS_CS_READY) { 796 /* the client is already initialised */ 797 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 798 return 0; 799 } 800 801 /* 802 * Create a client RPC handle for doing FSSTAT with UNIX auth only 803 * - RFC 2623, sec 2.3.2 804 */ 805 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 806 0, noresvport); 807 if (error < 0) 808 goto error; 809 nfs_mark_client_ready(clp, NFS_CS_READY); 810 return 0; 811 812 error: 813 nfs_mark_client_ready(clp, error); 814 dprintk("<-- nfs_init_client() = xerror %d\n", error); 815 return error; 816 } 817 818 /* 819 * Create a version 2 or 3 client 820 */ 821 static int nfs_init_server(struct nfs_server *server, 822 const struct nfs_parsed_mount_data *data) 823 { 824 struct nfs_client_initdata cl_init = { 825 .hostname = data->nfs_server.hostname, 826 .addr = (const struct sockaddr *)&data->nfs_server.address, 827 .addrlen = data->nfs_server.addrlen, 828 .rpc_ops = &nfs_v2_clientops, 829 .proto = data->nfs_server.protocol, 830 }; 831 struct rpc_timeout timeparms; 832 struct nfs_client *clp; 833 int error; 834 835 dprintk("--> nfs_init_server()\n"); 836 837 #ifdef CONFIG_NFS_V3 838 if (data->version == 3) 839 cl_init.rpc_ops = &nfs_v3_clientops; 840 #endif 841 842 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 843 data->timeo, data->retrans); 844 845 /* Allocate or find a client reference we can use */ 846 clp = nfs_get_client(&cl_init, &timeparms, NULL, RPC_AUTH_UNIX, 847 data->flags & NFS_MOUNT_NORESVPORT); 848 if (IS_ERR(clp)) { 849 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 850 return PTR_ERR(clp); 851 } 852 853 server->nfs_client = clp; 854 855 /* Initialise the client representation from the mount data */ 856 server->flags = data->flags; 857 server->options = data->options; 858 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 859 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 860 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 861 862 if (data->rsize) 863 server->rsize = nfs_block_size(data->rsize, NULL); 864 if (data->wsize) 865 server->wsize = nfs_block_size(data->wsize, NULL); 866 867 server->acregmin = data->acregmin * HZ; 868 server->acregmax = data->acregmax * HZ; 869 server->acdirmin = data->acdirmin * HZ; 870 server->acdirmax = data->acdirmax * HZ; 871 872 /* Start lockd here, before we might error out */ 873 error = nfs_start_lockd(server); 874 if (error < 0) 875 goto error; 876 877 server->port = data->nfs_server.port; 878 879 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 880 if (error < 0) 881 goto error; 882 883 /* Preserve the values of mount_server-related mount options */ 884 if (data->mount_server.addrlen) { 885 memcpy(&server->mountd_address, &data->mount_server.address, 886 data->mount_server.addrlen); 887 server->mountd_addrlen = data->mount_server.addrlen; 888 } 889 server->mountd_version = data->mount_server.version; 890 server->mountd_port = data->mount_server.port; 891 server->mountd_protocol = data->mount_server.protocol; 892 893 server->namelen = data->namlen; 894 /* Create a client RPC handle for the NFSv3 ACL management interface */ 895 nfs_init_server_aclclient(server); 896 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 897 return 0; 898 899 error: 900 server->nfs_client = NULL; 901 nfs_put_client(clp); 902 dprintk("<-- nfs_init_server() = xerror %d\n", error); 903 return error; 904 } 905 906 /* 907 * Load up the server record from information gained in an fsinfo record 908 */ 909 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 910 { 911 unsigned long max_rpc_payload; 912 913 /* Work out a lot of parameters */ 914 if (server->rsize == 0) 915 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 916 if (server->wsize == 0) 917 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 918 919 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 920 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 921 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 922 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 923 924 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 925 if (server->rsize > max_rpc_payload) 926 server->rsize = max_rpc_payload; 927 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 928 server->rsize = NFS_MAX_FILE_IO_SIZE; 929 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 930 931 server->backing_dev_info.name = "nfs"; 932 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 933 934 if (server->wsize > max_rpc_payload) 935 server->wsize = max_rpc_payload; 936 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 937 server->wsize = NFS_MAX_FILE_IO_SIZE; 938 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 939 set_pnfs_layoutdriver(server, fsinfo->layouttype); 940 941 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 942 943 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 944 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 945 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 946 if (server->dtsize > server->rsize) 947 server->dtsize = server->rsize; 948 949 if (server->flags & NFS_MOUNT_NOAC) { 950 server->acregmin = server->acregmax = 0; 951 server->acdirmin = server->acdirmax = 0; 952 } 953 954 server->maxfilesize = fsinfo->maxfilesize; 955 956 server->time_delta = fsinfo->time_delta; 957 958 /* We're airborne Set socket buffersize */ 959 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 960 } 961 962 /* 963 * Probe filesystem information, including the FSID on v2/v3 964 */ 965 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 966 { 967 struct nfs_fsinfo fsinfo; 968 struct nfs_client *clp = server->nfs_client; 969 int error; 970 971 dprintk("--> nfs_probe_fsinfo()\n"); 972 973 if (clp->rpc_ops->set_capabilities != NULL) { 974 error = clp->rpc_ops->set_capabilities(server, mntfh); 975 if (error < 0) 976 goto out_error; 977 } 978 979 fsinfo.fattr = fattr; 980 fsinfo.layouttype = 0; 981 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 982 if (error < 0) 983 goto out_error; 984 985 nfs_server_set_fsinfo(server, &fsinfo); 986 987 /* Get some general file system info */ 988 if (server->namelen == 0) { 989 struct nfs_pathconf pathinfo; 990 991 pathinfo.fattr = fattr; 992 nfs_fattr_init(fattr); 993 994 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 995 server->namelen = pathinfo.max_namelen; 996 } 997 998 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 999 return 0; 1000 1001 out_error: 1002 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 1003 return error; 1004 } 1005 1006 /* 1007 * Copy useful information when duplicating a server record 1008 */ 1009 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 1010 { 1011 target->flags = source->flags; 1012 target->rsize = source->rsize; 1013 target->wsize = source->wsize; 1014 target->acregmin = source->acregmin; 1015 target->acregmax = source->acregmax; 1016 target->acdirmin = source->acdirmin; 1017 target->acdirmax = source->acdirmax; 1018 target->caps = source->caps; 1019 target->options = source->options; 1020 } 1021 1022 static void nfs_server_insert_lists(struct nfs_server *server) 1023 { 1024 struct nfs_client *clp = server->nfs_client; 1025 1026 spin_lock(&nfs_client_lock); 1027 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1028 list_add_tail(&server->master_link, &nfs_volume_list); 1029 clear_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1030 spin_unlock(&nfs_client_lock); 1031 1032 } 1033 1034 static void nfs_server_remove_lists(struct nfs_server *server) 1035 { 1036 struct nfs_client *clp = server->nfs_client; 1037 1038 spin_lock(&nfs_client_lock); 1039 list_del_rcu(&server->client_link); 1040 if (clp && list_empty(&clp->cl_superblocks)) 1041 set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state); 1042 list_del(&server->master_link); 1043 spin_unlock(&nfs_client_lock); 1044 1045 synchronize_rcu(); 1046 } 1047 1048 /* 1049 * Allocate and initialise a server record 1050 */ 1051 static struct nfs_server *nfs_alloc_server(void) 1052 { 1053 struct nfs_server *server; 1054 1055 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1056 if (!server) 1057 return NULL; 1058 1059 server->client = server->client_acl = ERR_PTR(-EINVAL); 1060 1061 /* Zero out the NFS state stuff */ 1062 INIT_LIST_HEAD(&server->client_link); 1063 INIT_LIST_HEAD(&server->master_link); 1064 INIT_LIST_HEAD(&server->delegations); 1065 1066 atomic_set(&server->active, 0); 1067 1068 server->io_stats = nfs_alloc_iostats(); 1069 if (!server->io_stats) { 1070 kfree(server); 1071 return NULL; 1072 } 1073 1074 if (bdi_init(&server->backing_dev_info)) { 1075 nfs_free_iostats(server->io_stats); 1076 kfree(server); 1077 return NULL; 1078 } 1079 1080 pnfs_init_server(server); 1081 1082 return server; 1083 } 1084 1085 /* 1086 * Free up a server record 1087 */ 1088 void nfs_free_server(struct nfs_server *server) 1089 { 1090 dprintk("--> nfs_free_server()\n"); 1091 1092 nfs_server_remove_lists(server); 1093 unset_pnfs_layoutdriver(server); 1094 1095 if (server->destroy != NULL) 1096 server->destroy(server); 1097 1098 if (!IS_ERR(server->client_acl)) 1099 rpc_shutdown_client(server->client_acl); 1100 if (!IS_ERR(server->client)) 1101 rpc_shutdown_client(server->client); 1102 1103 nfs_put_client(server->nfs_client); 1104 1105 nfs_free_iostats(server->io_stats); 1106 bdi_destroy(&server->backing_dev_info); 1107 kfree(server); 1108 nfs_release_automount_timer(); 1109 dprintk("<-- nfs_free_server()\n"); 1110 } 1111 1112 /* 1113 * Create a version 2 or 3 volume record 1114 * - keyed on server and FSID 1115 */ 1116 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1117 struct nfs_fh *mntfh) 1118 { 1119 struct nfs_server *server; 1120 struct nfs_fattr *fattr; 1121 int error; 1122 1123 server = nfs_alloc_server(); 1124 if (!server) 1125 return ERR_PTR(-ENOMEM); 1126 1127 error = -ENOMEM; 1128 fattr = nfs_alloc_fattr(); 1129 if (fattr == NULL) 1130 goto error; 1131 1132 /* Get a client representation */ 1133 error = nfs_init_server(server, data); 1134 if (error < 0) 1135 goto error; 1136 1137 BUG_ON(!server->nfs_client); 1138 BUG_ON(!server->nfs_client->rpc_ops); 1139 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1140 1141 /* Probe the root fh to retrieve its FSID */ 1142 error = nfs_probe_fsinfo(server, mntfh, fattr); 1143 if (error < 0) 1144 goto error; 1145 if (server->nfs_client->rpc_ops->version == 3) { 1146 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1147 server->namelen = NFS3_MAXNAMLEN; 1148 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1149 server->caps |= NFS_CAP_READDIRPLUS; 1150 } else { 1151 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1152 server->namelen = NFS2_MAXNAMLEN; 1153 } 1154 1155 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1156 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1157 if (error < 0) { 1158 dprintk("nfs_create_server: getattr error = %d\n", -error); 1159 goto error; 1160 } 1161 } 1162 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1163 1164 dprintk("Server FSID: %llx:%llx\n", 1165 (unsigned long long) server->fsid.major, 1166 (unsigned long long) server->fsid.minor); 1167 1168 nfs_server_insert_lists(server); 1169 server->mount_time = jiffies; 1170 nfs_free_fattr(fattr); 1171 return server; 1172 1173 error: 1174 nfs_free_fattr(fattr); 1175 nfs_free_server(server); 1176 return ERR_PTR(error); 1177 } 1178 1179 #ifdef CONFIG_NFS_V4 1180 /* 1181 * NFSv4.0 callback thread helper 1182 * 1183 * Find a client by IP address, protocol version, and minorversion 1184 * 1185 * Called from the pg_authenticate method. The callback identifier 1186 * is not used as it has not been decoded. 1187 * 1188 * Returns NULL if no such client 1189 */ 1190 struct nfs_client * 1191 nfs4_find_client_no_ident(const struct sockaddr *addr) 1192 { 1193 struct nfs_client *clp; 1194 1195 spin_lock(&nfs_client_lock); 1196 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1197 if (nfs4_cb_match_client(addr, clp, 0) == false) 1198 continue; 1199 atomic_inc(&clp->cl_count); 1200 spin_unlock(&nfs_client_lock); 1201 return clp; 1202 } 1203 spin_unlock(&nfs_client_lock); 1204 return NULL; 1205 } 1206 1207 /* 1208 * NFSv4.0 callback thread helper 1209 * 1210 * Find a client by callback identifier 1211 */ 1212 struct nfs_client * 1213 nfs4_find_client_ident(int cb_ident) 1214 { 1215 struct nfs_client *clp; 1216 1217 spin_lock(&nfs_client_lock); 1218 clp = idr_find(&cb_ident_idr, cb_ident); 1219 if (clp) 1220 atomic_inc(&clp->cl_count); 1221 spin_unlock(&nfs_client_lock); 1222 return clp; 1223 } 1224 1225 #if defined(CONFIG_NFS_V4_1) 1226 /* 1227 * NFSv4.1 callback thread helper 1228 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1229 * minorversion, and sessionID 1230 * 1231 * Returns NULL if no such client 1232 */ 1233 struct nfs_client * 1234 nfs4_find_client_sessionid(const struct sockaddr *addr, 1235 struct nfs4_sessionid *sid) 1236 { 1237 struct nfs_client *clp; 1238 1239 spin_lock(&nfs_client_lock); 1240 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1241 if (nfs4_cb_match_client(addr, clp, 1) == false) 1242 continue; 1243 1244 if (!nfs4_has_session(clp)) 1245 continue; 1246 1247 /* Match sessionid*/ 1248 if (memcmp(clp->cl_session->sess_id.data, 1249 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1250 continue; 1251 1252 atomic_inc(&clp->cl_count); 1253 spin_unlock(&nfs_client_lock); 1254 return clp; 1255 } 1256 spin_unlock(&nfs_client_lock); 1257 return NULL; 1258 } 1259 1260 #else /* CONFIG_NFS_V4_1 */ 1261 1262 struct nfs_client * 1263 nfs4_find_client_sessionid(const struct sockaddr *addr, 1264 struct nfs4_sessionid *sid) 1265 { 1266 return NULL; 1267 } 1268 #endif /* CONFIG_NFS_V4_1 */ 1269 1270 /* 1271 * Initialize the NFS4 callback service 1272 */ 1273 static int nfs4_init_callback(struct nfs_client *clp) 1274 { 1275 int error; 1276 1277 if (clp->rpc_ops->version == 4) { 1278 if (nfs4_has_session(clp)) { 1279 error = xprt_setup_backchannel( 1280 clp->cl_rpcclient->cl_xprt, 1281 NFS41_BC_MIN_CALLBACKS); 1282 if (error < 0) 1283 return error; 1284 } 1285 1286 error = nfs_callback_up(clp->cl_mvops->minor_version, 1287 clp->cl_rpcclient->cl_xprt); 1288 if (error < 0) { 1289 dprintk("%s: failed to start callback. Error = %d\n", 1290 __func__, error); 1291 return error; 1292 } 1293 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1294 } 1295 return 0; 1296 } 1297 1298 /* 1299 * Initialize the minor version specific parts of an NFS4 client record 1300 */ 1301 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1302 { 1303 #if defined(CONFIG_NFS_V4_1) 1304 if (clp->cl_mvops->minor_version) { 1305 struct nfs4_session *session = NULL; 1306 /* 1307 * Create the session and mark it expired. 1308 * When a SEQUENCE operation encounters the expired session 1309 * it will do session recovery to initialize it. 1310 */ 1311 session = nfs4_alloc_session(clp); 1312 if (!session) 1313 return -ENOMEM; 1314 1315 clp->cl_session = session; 1316 /* 1317 * The create session reply races with the server back 1318 * channel probe. Mark the client NFS_CS_SESSION_INITING 1319 * so that the client back channel can find the 1320 * nfs_client struct 1321 */ 1322 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1323 } 1324 #endif /* CONFIG_NFS_V4_1 */ 1325 1326 return nfs4_init_callback(clp); 1327 } 1328 1329 /* 1330 * Initialise an NFS4 client record 1331 */ 1332 int nfs4_init_client(struct nfs_client *clp, 1333 const struct rpc_timeout *timeparms, 1334 const char *ip_addr, 1335 rpc_authflavor_t authflavour, 1336 int noresvport) 1337 { 1338 int error; 1339 1340 if (clp->cl_cons_state == NFS_CS_READY) { 1341 /* the client is initialised already */ 1342 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1343 return 0; 1344 } 1345 1346 /* Check NFS protocol revision and initialize RPC op vector */ 1347 clp->rpc_ops = &nfs_v4_clientops; 1348 1349 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1350 1, noresvport); 1351 if (error < 0) 1352 goto error; 1353 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1354 1355 error = nfs_idmap_new(clp); 1356 if (error < 0) { 1357 dprintk("%s: failed to create idmapper. Error = %d\n", 1358 __func__, error); 1359 goto error; 1360 } 1361 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1362 1363 error = nfs4_init_client_minor_version(clp); 1364 if (error < 0) 1365 goto error; 1366 1367 if (!nfs4_has_session(clp)) 1368 nfs_mark_client_ready(clp, NFS_CS_READY); 1369 return 0; 1370 1371 error: 1372 nfs_mark_client_ready(clp, error); 1373 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1374 return error; 1375 } 1376 1377 /* 1378 * Set up an NFS4 client 1379 */ 1380 static int nfs4_set_client(struct nfs_server *server, 1381 const char *hostname, 1382 const struct sockaddr *addr, 1383 const size_t addrlen, 1384 const char *ip_addr, 1385 rpc_authflavor_t authflavour, 1386 int proto, const struct rpc_timeout *timeparms, 1387 u32 minorversion) 1388 { 1389 struct nfs_client_initdata cl_init = { 1390 .hostname = hostname, 1391 .addr = addr, 1392 .addrlen = addrlen, 1393 .rpc_ops = &nfs_v4_clientops, 1394 .proto = proto, 1395 .minorversion = minorversion, 1396 }; 1397 struct nfs_client *clp; 1398 int error; 1399 1400 dprintk("--> nfs4_set_client()\n"); 1401 1402 /* Allocate or find a client reference we can use */ 1403 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour, 1404 server->flags & NFS_MOUNT_NORESVPORT); 1405 if (IS_ERR(clp)) { 1406 error = PTR_ERR(clp); 1407 goto error; 1408 } 1409 1410 /* 1411 * Query for the lease time on clientid setup or renewal 1412 * 1413 * Note that this will be set on nfs_clients that were created 1414 * only for the DS role and did not set this bit, but now will 1415 * serve a dual role. 1416 */ 1417 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 1418 1419 server->nfs_client = clp; 1420 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1421 return 0; 1422 error: 1423 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1424 return error; 1425 } 1426 1427 /* 1428 * Set up a pNFS Data Server client. 1429 * 1430 * Return any existing nfs_client that matches server address,port,version 1431 * and minorversion. 1432 * 1433 * For a new nfs_client, use a soft mount (default), a low retrans and a 1434 * low timeout interval so that if a connection is lost, we retry through 1435 * the MDS. 1436 */ 1437 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 1438 const struct sockaddr *ds_addr, 1439 int ds_addrlen, int ds_proto) 1440 { 1441 struct nfs_client_initdata cl_init = { 1442 .addr = ds_addr, 1443 .addrlen = ds_addrlen, 1444 .rpc_ops = &nfs_v4_clientops, 1445 .proto = ds_proto, 1446 .minorversion = mds_clp->cl_minorversion, 1447 }; 1448 struct rpc_timeout ds_timeout = { 1449 .to_initval = 15 * HZ, 1450 .to_maxval = 15 * HZ, 1451 .to_retries = 1, 1452 .to_exponential = 1, 1453 }; 1454 struct nfs_client *clp; 1455 1456 /* 1457 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1458 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1459 * (section 13.1 RFC 5661). 1460 */ 1461 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 1462 mds_clp->cl_rpcclient->cl_auth->au_flavor, 0); 1463 1464 dprintk("<-- %s %p\n", __func__, clp); 1465 return clp; 1466 } 1467 EXPORT_SYMBOL(nfs4_set_ds_client); 1468 1469 /* 1470 * Session has been established, and the client marked ready. 1471 * Set the mount rsize and wsize with negotiated fore channel 1472 * attributes which will be bound checked in nfs_server_set_fsinfo. 1473 */ 1474 static void nfs4_session_set_rwsize(struct nfs_server *server) 1475 { 1476 #ifdef CONFIG_NFS_V4_1 1477 struct nfs4_session *sess; 1478 u32 server_resp_sz; 1479 u32 server_rqst_sz; 1480 1481 if (!nfs4_has_session(server->nfs_client)) 1482 return; 1483 sess = server->nfs_client->cl_session; 1484 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1485 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1486 1487 if (server->rsize > server_resp_sz) 1488 server->rsize = server_resp_sz; 1489 if (server->wsize > server_rqst_sz) 1490 server->wsize = server_rqst_sz; 1491 #endif /* CONFIG_NFS_V4_1 */ 1492 } 1493 1494 static int nfs4_server_common_setup(struct nfs_server *server, 1495 struct nfs_fh *mntfh) 1496 { 1497 struct nfs_fattr *fattr; 1498 int error; 1499 1500 BUG_ON(!server->nfs_client); 1501 BUG_ON(!server->nfs_client->rpc_ops); 1502 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1503 1504 /* data servers support only a subset of NFSv4.1 */ 1505 if (is_ds_only_client(server->nfs_client)) 1506 return -EPROTONOSUPPORT; 1507 1508 fattr = nfs_alloc_fattr(); 1509 if (fattr == NULL) 1510 return -ENOMEM; 1511 1512 /* We must ensure the session is initialised first */ 1513 error = nfs4_init_session(server); 1514 if (error < 0) 1515 goto out; 1516 1517 /* Probe the root fh to retrieve its FSID and filehandle */ 1518 error = nfs4_get_rootfh(server, mntfh); 1519 if (error < 0) 1520 goto out; 1521 1522 dprintk("Server FSID: %llx:%llx\n", 1523 (unsigned long long) server->fsid.major, 1524 (unsigned long long) server->fsid.minor); 1525 dprintk("Mount FH: %d\n", mntfh->size); 1526 1527 nfs4_session_set_rwsize(server); 1528 1529 error = nfs_probe_fsinfo(server, mntfh, fattr); 1530 if (error < 0) 1531 goto out; 1532 1533 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1534 server->namelen = NFS4_MAXNAMLEN; 1535 1536 nfs_server_insert_lists(server); 1537 server->mount_time = jiffies; 1538 out: 1539 nfs_free_fattr(fattr); 1540 return error; 1541 } 1542 1543 /* 1544 * Create a version 4 volume record 1545 */ 1546 static int nfs4_init_server(struct nfs_server *server, 1547 const struct nfs_parsed_mount_data *data) 1548 { 1549 struct rpc_timeout timeparms; 1550 int error; 1551 1552 dprintk("--> nfs4_init_server()\n"); 1553 1554 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1555 data->timeo, data->retrans); 1556 1557 /* Initialise the client representation from the mount data */ 1558 server->flags = data->flags; 1559 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1560 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1561 server->caps |= NFS_CAP_READDIRPLUS; 1562 server->options = data->options; 1563 1564 /* Get a client record */ 1565 error = nfs4_set_client(server, 1566 data->nfs_server.hostname, 1567 (const struct sockaddr *)&data->nfs_server.address, 1568 data->nfs_server.addrlen, 1569 data->client_address, 1570 data->auth_flavors[0], 1571 data->nfs_server.protocol, 1572 &timeparms, 1573 data->minorversion); 1574 if (error < 0) 1575 goto error; 1576 1577 /* 1578 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1579 * authentication. 1580 */ 1581 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) 1582 server->caps |= NFS_CAP_UIDGID_NOMAP; 1583 1584 if (data->rsize) 1585 server->rsize = nfs_block_size(data->rsize, NULL); 1586 if (data->wsize) 1587 server->wsize = nfs_block_size(data->wsize, NULL); 1588 1589 server->acregmin = data->acregmin * HZ; 1590 server->acregmax = data->acregmax * HZ; 1591 server->acdirmin = data->acdirmin * HZ; 1592 server->acdirmax = data->acdirmax * HZ; 1593 1594 server->port = data->nfs_server.port; 1595 1596 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1597 1598 error: 1599 /* Done */ 1600 dprintk("<-- nfs4_init_server() = %d\n", error); 1601 return error; 1602 } 1603 1604 /* 1605 * Create a version 4 volume record 1606 * - keyed on server and FSID 1607 */ 1608 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1609 struct nfs_fh *mntfh) 1610 { 1611 struct nfs_server *server; 1612 int error; 1613 1614 dprintk("--> nfs4_create_server()\n"); 1615 1616 server = nfs_alloc_server(); 1617 if (!server) 1618 return ERR_PTR(-ENOMEM); 1619 1620 /* set up the general RPC client */ 1621 error = nfs4_init_server(server, data); 1622 if (error < 0) 1623 goto error; 1624 1625 error = nfs4_server_common_setup(server, mntfh); 1626 if (error < 0) 1627 goto error; 1628 1629 dprintk("<-- nfs4_create_server() = %p\n", server); 1630 return server; 1631 1632 error: 1633 nfs_free_server(server); 1634 dprintk("<-- nfs4_create_server() = error %d\n", error); 1635 return ERR_PTR(error); 1636 } 1637 1638 /* 1639 * Create an NFS4 referral server record 1640 */ 1641 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1642 struct nfs_fh *mntfh) 1643 { 1644 struct nfs_client *parent_client; 1645 struct nfs_server *server, *parent_server; 1646 int error; 1647 1648 dprintk("--> nfs4_create_referral_server()\n"); 1649 1650 server = nfs_alloc_server(); 1651 if (!server) 1652 return ERR_PTR(-ENOMEM); 1653 1654 parent_server = NFS_SB(data->sb); 1655 parent_client = parent_server->nfs_client; 1656 1657 /* Initialise the client representation from the parent server */ 1658 nfs_server_copy_userdata(server, parent_server); 1659 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1660 1661 /* Get a client representation. 1662 * Note: NFSv4 always uses TCP, */ 1663 error = nfs4_set_client(server, data->hostname, 1664 data->addr, 1665 data->addrlen, 1666 parent_client->cl_ipaddr, 1667 data->authflavor, 1668 parent_server->client->cl_xprt->prot, 1669 parent_server->client->cl_timeout, 1670 parent_client->cl_mvops->minor_version); 1671 if (error < 0) 1672 goto error; 1673 1674 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1675 if (error < 0) 1676 goto error; 1677 1678 error = nfs4_server_common_setup(server, mntfh); 1679 if (error < 0) 1680 goto error; 1681 1682 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1683 return server; 1684 1685 error: 1686 nfs_free_server(server); 1687 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1688 return ERR_PTR(error); 1689 } 1690 1691 #endif /* CONFIG_NFS_V4 */ 1692 1693 /* 1694 * Clone an NFS2, NFS3 or NFS4 server record 1695 */ 1696 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1697 struct nfs_fh *fh, 1698 struct nfs_fattr *fattr) 1699 { 1700 struct nfs_server *server; 1701 struct nfs_fattr *fattr_fsinfo; 1702 int error; 1703 1704 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1705 (unsigned long long) fattr->fsid.major, 1706 (unsigned long long) fattr->fsid.minor); 1707 1708 server = nfs_alloc_server(); 1709 if (!server) 1710 return ERR_PTR(-ENOMEM); 1711 1712 error = -ENOMEM; 1713 fattr_fsinfo = nfs_alloc_fattr(); 1714 if (fattr_fsinfo == NULL) 1715 goto out_free_server; 1716 1717 /* Copy data from the source */ 1718 server->nfs_client = source->nfs_client; 1719 atomic_inc(&server->nfs_client->cl_count); 1720 nfs_server_copy_userdata(server, source); 1721 1722 server->fsid = fattr->fsid; 1723 1724 error = nfs_init_server_rpcclient(server, 1725 source->client->cl_timeout, 1726 source->client->cl_auth->au_flavor); 1727 if (error < 0) 1728 goto out_free_server; 1729 if (!IS_ERR(source->client_acl)) 1730 nfs_init_server_aclclient(server); 1731 1732 /* probe the filesystem info for this server filesystem */ 1733 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1734 if (error < 0) 1735 goto out_free_server; 1736 1737 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1738 server->namelen = NFS4_MAXNAMLEN; 1739 1740 dprintk("Cloned FSID: %llx:%llx\n", 1741 (unsigned long long) server->fsid.major, 1742 (unsigned long long) server->fsid.minor); 1743 1744 error = nfs_start_lockd(server); 1745 if (error < 0) 1746 goto out_free_server; 1747 1748 nfs_server_insert_lists(server); 1749 server->mount_time = jiffies; 1750 1751 nfs_free_fattr(fattr_fsinfo); 1752 dprintk("<-- nfs_clone_server() = %p\n", server); 1753 return server; 1754 1755 out_free_server: 1756 nfs_free_fattr(fattr_fsinfo); 1757 nfs_free_server(server); 1758 dprintk("<-- nfs_clone_server() = error %d\n", error); 1759 return ERR_PTR(error); 1760 } 1761 1762 #ifdef CONFIG_PROC_FS 1763 static struct proc_dir_entry *proc_fs_nfs; 1764 1765 static int nfs_server_list_open(struct inode *inode, struct file *file); 1766 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1767 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1768 static void nfs_server_list_stop(struct seq_file *p, void *v); 1769 static int nfs_server_list_show(struct seq_file *m, void *v); 1770 1771 static const struct seq_operations nfs_server_list_ops = { 1772 .start = nfs_server_list_start, 1773 .next = nfs_server_list_next, 1774 .stop = nfs_server_list_stop, 1775 .show = nfs_server_list_show, 1776 }; 1777 1778 static const struct file_operations nfs_server_list_fops = { 1779 .open = nfs_server_list_open, 1780 .read = seq_read, 1781 .llseek = seq_lseek, 1782 .release = seq_release, 1783 .owner = THIS_MODULE, 1784 }; 1785 1786 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1787 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1788 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1789 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1790 static int nfs_volume_list_show(struct seq_file *m, void *v); 1791 1792 static const struct seq_operations nfs_volume_list_ops = { 1793 .start = nfs_volume_list_start, 1794 .next = nfs_volume_list_next, 1795 .stop = nfs_volume_list_stop, 1796 .show = nfs_volume_list_show, 1797 }; 1798 1799 static const struct file_operations nfs_volume_list_fops = { 1800 .open = nfs_volume_list_open, 1801 .read = seq_read, 1802 .llseek = seq_lseek, 1803 .release = seq_release, 1804 .owner = THIS_MODULE, 1805 }; 1806 1807 /* 1808 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1809 * we're dealing 1810 */ 1811 static int nfs_server_list_open(struct inode *inode, struct file *file) 1812 { 1813 struct seq_file *m; 1814 int ret; 1815 1816 ret = seq_open(file, &nfs_server_list_ops); 1817 if (ret < 0) 1818 return ret; 1819 1820 m = file->private_data; 1821 m->private = PDE(inode)->data; 1822 1823 return 0; 1824 } 1825 1826 /* 1827 * set up the iterator to start reading from the server list and return the first item 1828 */ 1829 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1830 { 1831 /* lock the list against modification */ 1832 spin_lock(&nfs_client_lock); 1833 return seq_list_start_head(&nfs_client_list, *_pos); 1834 } 1835 1836 /* 1837 * move to next server 1838 */ 1839 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1840 { 1841 return seq_list_next(v, &nfs_client_list, pos); 1842 } 1843 1844 /* 1845 * clean up after reading from the transports list 1846 */ 1847 static void nfs_server_list_stop(struct seq_file *p, void *v) 1848 { 1849 spin_unlock(&nfs_client_lock); 1850 } 1851 1852 /* 1853 * display a header line followed by a load of call lines 1854 */ 1855 static int nfs_server_list_show(struct seq_file *m, void *v) 1856 { 1857 struct nfs_client *clp; 1858 1859 /* display header on line 1 */ 1860 if (v == &nfs_client_list) { 1861 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1862 return 0; 1863 } 1864 1865 /* display one transport per line on subsequent lines */ 1866 clp = list_entry(v, struct nfs_client, cl_share_link); 1867 1868 seq_printf(m, "v%u %s %s %3d %s\n", 1869 clp->rpc_ops->version, 1870 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1871 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1872 atomic_read(&clp->cl_count), 1873 clp->cl_hostname); 1874 1875 return 0; 1876 } 1877 1878 /* 1879 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1880 */ 1881 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1882 { 1883 struct seq_file *m; 1884 int ret; 1885 1886 ret = seq_open(file, &nfs_volume_list_ops); 1887 if (ret < 0) 1888 return ret; 1889 1890 m = file->private_data; 1891 m->private = PDE(inode)->data; 1892 1893 return 0; 1894 } 1895 1896 /* 1897 * set up the iterator to start reading from the volume list and return the first item 1898 */ 1899 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1900 { 1901 /* lock the list against modification */ 1902 spin_lock(&nfs_client_lock); 1903 return seq_list_start_head(&nfs_volume_list, *_pos); 1904 } 1905 1906 /* 1907 * move to next volume 1908 */ 1909 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1910 { 1911 return seq_list_next(v, &nfs_volume_list, pos); 1912 } 1913 1914 /* 1915 * clean up after reading from the transports list 1916 */ 1917 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1918 { 1919 spin_unlock(&nfs_client_lock); 1920 } 1921 1922 /* 1923 * display a header line followed by a load of call lines 1924 */ 1925 static int nfs_volume_list_show(struct seq_file *m, void *v) 1926 { 1927 struct nfs_server *server; 1928 struct nfs_client *clp; 1929 char dev[8], fsid[17]; 1930 1931 /* display header on line 1 */ 1932 if (v == &nfs_volume_list) { 1933 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1934 return 0; 1935 } 1936 /* display one transport per line on subsequent lines */ 1937 server = list_entry(v, struct nfs_server, master_link); 1938 clp = server->nfs_client; 1939 1940 snprintf(dev, 8, "%u:%u", 1941 MAJOR(server->s_dev), MINOR(server->s_dev)); 1942 1943 snprintf(fsid, 17, "%llx:%llx", 1944 (unsigned long long) server->fsid.major, 1945 (unsigned long long) server->fsid.minor); 1946 1947 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1948 clp->rpc_ops->version, 1949 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1950 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1951 dev, 1952 fsid, 1953 nfs_server_fscache_state(server)); 1954 1955 return 0; 1956 } 1957 1958 /* 1959 * initialise the /proc/fs/nfsfs/ directory 1960 */ 1961 int __init nfs_fs_proc_init(void) 1962 { 1963 struct proc_dir_entry *p; 1964 1965 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1966 if (!proc_fs_nfs) 1967 goto error_0; 1968 1969 /* a file of servers with which we're dealing */ 1970 p = proc_create("servers", S_IFREG|S_IRUGO, 1971 proc_fs_nfs, &nfs_server_list_fops); 1972 if (!p) 1973 goto error_1; 1974 1975 /* a file of volumes that we have mounted */ 1976 p = proc_create("volumes", S_IFREG|S_IRUGO, 1977 proc_fs_nfs, &nfs_volume_list_fops); 1978 if (!p) 1979 goto error_2; 1980 return 0; 1981 1982 error_2: 1983 remove_proc_entry("servers", proc_fs_nfs); 1984 error_1: 1985 remove_proc_entry("fs/nfsfs", NULL); 1986 error_0: 1987 return -ENOMEM; 1988 } 1989 1990 /* 1991 * clean up the /proc/fs/nfsfs/ directory 1992 */ 1993 void nfs_fs_proc_exit(void) 1994 { 1995 remove_proc_entry("volumes", proc_fs_nfs); 1996 remove_proc_entry("servers", proc_fs_nfs); 1997 remove_proc_entry("fs/nfsfs", NULL); 1998 } 1999 2000 #endif /* CONFIG_PROC_FS */ 2001 2002 module_param(nfs4_disable_idmapping, bool, 0644); 2003 MODULE_PARM_DESC(nfs4_disable_idmapping, 2004 "Turn off NFSv4 idmapping when using 'sec=sys'"); 2005