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 * RPC cruft for NFS 86 */ 87 static struct rpc_version *nfs_version[5] = { 88 [2] = &nfs_version2, 89 #ifdef CONFIG_NFS_V3 90 [3] = &nfs_version3, 91 #endif 92 #ifdef CONFIG_NFS_V4 93 [4] = &nfs_version4, 94 #endif 95 }; 96 97 struct rpc_program nfs_program = { 98 .name = "nfs", 99 .number = NFS_PROGRAM, 100 .nrvers = ARRAY_SIZE(nfs_version), 101 .version = nfs_version, 102 .stats = &nfs_rpcstat, 103 .pipe_dir_name = "/nfs", 104 }; 105 106 struct rpc_stat nfs_rpcstat = { 107 .program = &nfs_program 108 }; 109 110 111 #ifdef CONFIG_NFS_V3_ACL 112 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; 113 static struct rpc_version * nfsacl_version[] = { 114 [3] = &nfsacl_version3, 115 }; 116 117 struct rpc_program nfsacl_program = { 118 .name = "nfsacl", 119 .number = NFS_ACL_PROGRAM, 120 .nrvers = ARRAY_SIZE(nfsacl_version), 121 .version = nfsacl_version, 122 .stats = &nfsacl_rpcstat, 123 }; 124 #endif /* CONFIG_NFS_V3_ACL */ 125 126 struct nfs_client_initdata { 127 const char *hostname; 128 const struct sockaddr *addr; 129 size_t addrlen; 130 const struct nfs_rpc_ops *rpc_ops; 131 int proto; 132 u32 minorversion; 133 }; 134 135 /* 136 * Allocate a shared client record 137 * 138 * Since these are allocated/deallocated very rarely, we don't 139 * bother putting them in a slab cache... 140 */ 141 static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init) 142 { 143 struct nfs_client *clp; 144 struct rpc_cred *cred; 145 int err = -ENOMEM; 146 147 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) 148 goto error_0; 149 150 clp->rpc_ops = cl_init->rpc_ops; 151 152 atomic_set(&clp->cl_count, 1); 153 clp->cl_cons_state = NFS_CS_INITING; 154 155 memcpy(&clp->cl_addr, cl_init->addr, cl_init->addrlen); 156 clp->cl_addrlen = cl_init->addrlen; 157 158 if (cl_init->hostname) { 159 err = -ENOMEM; 160 clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL); 161 if (!clp->cl_hostname) 162 goto error_cleanup; 163 } 164 165 INIT_LIST_HEAD(&clp->cl_superblocks); 166 clp->cl_rpcclient = ERR_PTR(-EINVAL); 167 168 clp->cl_proto = cl_init->proto; 169 170 #ifdef CONFIG_NFS_V4 171 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 172 if (err) 173 goto error_cleanup; 174 175 spin_lock_init(&clp->cl_lock); 176 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 177 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 178 clp->cl_boot_time = CURRENT_TIME; 179 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 180 clp->cl_minorversion = cl_init->minorversion; 181 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 182 #endif 183 cred = rpc_lookup_machine_cred(); 184 if (!IS_ERR(cred)) 185 clp->cl_machine_cred = cred; 186 #if defined(CONFIG_NFS_V4_1) 187 INIT_LIST_HEAD(&clp->cl_layouts); 188 #endif 189 nfs_fscache_get_client_cookie(clp); 190 191 return clp; 192 193 error_cleanup: 194 kfree(clp); 195 error_0: 196 return ERR_PTR(err); 197 } 198 199 #ifdef CONFIG_NFS_V4 200 #ifdef CONFIG_NFS_V4_1 201 static void nfs4_shutdown_session(struct nfs_client *clp) 202 { 203 if (nfs4_has_session(clp)) 204 nfs4_destroy_session(clp->cl_session); 205 } 206 #else /* CONFIG_NFS_V4_1 */ 207 static void nfs4_shutdown_session(struct nfs_client *clp) 208 { 209 } 210 #endif /* CONFIG_NFS_V4_1 */ 211 212 /* 213 * Destroy the NFS4 callback service 214 */ 215 static void nfs4_destroy_callback(struct nfs_client *clp) 216 { 217 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 218 nfs_callback_down(clp->cl_mvops->minor_version); 219 } 220 221 static void nfs4_shutdown_client(struct nfs_client *clp) 222 { 223 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 224 nfs4_kill_renewd(clp); 225 nfs4_shutdown_session(clp); 226 nfs4_destroy_callback(clp); 227 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 228 nfs_idmap_delete(clp); 229 230 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 231 } 232 233 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */ 234 void nfs_cleanup_cb_ident_idr(void) 235 { 236 idr_destroy(&cb_ident_idr); 237 } 238 239 /* nfs_client_lock held */ 240 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 241 { 242 if (clp->cl_cb_ident) 243 idr_remove(&cb_ident_idr, clp->cl_cb_ident); 244 } 245 246 static void pnfs_init_server(struct nfs_server *server) 247 { 248 rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC"); 249 } 250 251 #else 252 static void nfs4_shutdown_client(struct nfs_client *clp) 253 { 254 } 255 256 void nfs_cleanup_cb_ident_idr(void) 257 { 258 } 259 260 static void nfs_cb_idr_remove_locked(struct nfs_client *clp) 261 { 262 } 263 264 static void pnfs_init_server(struct nfs_server *server) 265 { 266 } 267 268 #endif /* CONFIG_NFS_V4 */ 269 270 /* 271 * Destroy a shared client record 272 */ 273 static void nfs_free_client(struct nfs_client *clp) 274 { 275 dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version); 276 277 nfs4_shutdown_client(clp); 278 279 nfs_fscache_release_client_cookie(clp); 280 281 /* -EIO all pending I/O */ 282 if (!IS_ERR(clp->cl_rpcclient)) 283 rpc_shutdown_client(clp->cl_rpcclient); 284 285 if (clp->cl_machine_cred != NULL) 286 put_rpccred(clp->cl_machine_cred); 287 288 kfree(clp->cl_hostname); 289 kfree(clp); 290 291 dprintk("<-- nfs_free_client()\n"); 292 } 293 294 /* 295 * Release a reference to a shared client record 296 */ 297 void nfs_put_client(struct nfs_client *clp) 298 { 299 if (!clp) 300 return; 301 302 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count)); 303 304 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { 305 list_del(&clp->cl_share_link); 306 nfs_cb_idr_remove_locked(clp); 307 spin_unlock(&nfs_client_lock); 308 309 BUG_ON(!list_empty(&clp->cl_superblocks)); 310 311 nfs_free_client(clp); 312 } 313 } 314 EXPORT_SYMBOL_GPL(nfs_put_client); 315 316 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 317 /* 318 * Test if two ip6 socket addresses refer to the same socket by 319 * comparing relevant fields. The padding bytes specifically, are not 320 * compared. sin6_flowinfo is not compared because it only affects QoS 321 * and sin6_scope_id is only compared if the address is "link local" 322 * because "link local" addresses need only be unique to a specific 323 * link. Conversely, ordinary unicast addresses might have different 324 * sin6_scope_id. 325 * 326 * The caller should ensure both socket addresses are AF_INET6. 327 */ 328 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 329 const struct sockaddr *sa2) 330 { 331 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 332 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 333 334 if (ipv6_addr_scope(&sin1->sin6_addr) == IPV6_ADDR_SCOPE_LINKLOCAL && 335 sin1->sin6_scope_id != sin2->sin6_scope_id) 336 return 0; 337 338 return ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr); 339 } 340 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */ 341 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr *sa1, 342 const struct sockaddr *sa2) 343 { 344 return 0; 345 } 346 #endif 347 348 /* 349 * Test if two ip4 socket addresses refer to the same socket, by 350 * comparing relevant fields. The padding bytes specifically, are 351 * not compared. 352 * 353 * The caller should ensure both socket addresses are AF_INET. 354 */ 355 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr *sa1, 356 const struct sockaddr *sa2) 357 { 358 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 359 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 360 361 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 362 } 363 364 static int nfs_sockaddr_cmp_ip6(const struct sockaddr *sa1, 365 const struct sockaddr *sa2) 366 { 367 const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sa1; 368 const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sa2; 369 370 return nfs_sockaddr_match_ipaddr6(sa1, sa2) && 371 (sin1->sin6_port == sin2->sin6_port); 372 } 373 374 static int nfs_sockaddr_cmp_ip4(const struct sockaddr *sa1, 375 const struct sockaddr *sa2) 376 { 377 const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sa1; 378 const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sa2; 379 380 return nfs_sockaddr_match_ipaddr4(sa1, sa2) && 381 (sin1->sin_port == sin2->sin_port); 382 } 383 384 /* 385 * Test if two socket addresses represent the same actual socket, 386 * by comparing (only) relevant fields, excluding the port number. 387 */ 388 static int nfs_sockaddr_match_ipaddr(const struct sockaddr *sa1, 389 const struct sockaddr *sa2) 390 { 391 if (sa1->sa_family != sa2->sa_family) 392 return 0; 393 394 switch (sa1->sa_family) { 395 case AF_INET: 396 return nfs_sockaddr_match_ipaddr4(sa1, sa2); 397 case AF_INET6: 398 return nfs_sockaddr_match_ipaddr6(sa1, sa2); 399 } 400 return 0; 401 } 402 403 /* 404 * Test if two socket addresses represent the same actual socket, 405 * by comparing (only) relevant fields, including the port number. 406 */ 407 static int nfs_sockaddr_cmp(const struct sockaddr *sa1, 408 const struct sockaddr *sa2) 409 { 410 if (sa1->sa_family != sa2->sa_family) 411 return 0; 412 413 switch (sa1->sa_family) { 414 case AF_INET: 415 return nfs_sockaddr_cmp_ip4(sa1, sa2); 416 case AF_INET6: 417 return nfs_sockaddr_cmp_ip6(sa1, sa2); 418 } 419 return 0; 420 } 421 422 /* Common match routine for v4.0 and v4.1 callback services */ 423 bool 424 nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp, 425 u32 minorversion) 426 { 427 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 428 429 /* Don't match clients that failed to initialise */ 430 if (!(clp->cl_cons_state == NFS_CS_READY || 431 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 432 return false; 433 434 /* Match the version and minorversion */ 435 if (clp->rpc_ops->version != 4 || 436 clp->cl_minorversion != minorversion) 437 return false; 438 439 /* Match only the IP address, not the port number */ 440 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 441 return false; 442 443 return true; 444 } 445 446 /* 447 * Find an nfs_client on the list that matches the initialisation data 448 * that is supplied. 449 */ 450 static struct nfs_client *nfs_match_client(const struct nfs_client_initdata *data) 451 { 452 struct nfs_client *clp; 453 const struct sockaddr *sap = data->addr; 454 455 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 456 const struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 457 /* Don't match clients that failed to initialise properly */ 458 if (clp->cl_cons_state < 0) 459 continue; 460 461 /* Different NFS versions cannot share the same nfs_client */ 462 if (clp->rpc_ops != data->rpc_ops) 463 continue; 464 465 if (clp->cl_proto != data->proto) 466 continue; 467 /* Match nfsv4 minorversion */ 468 if (clp->cl_minorversion != data->minorversion) 469 continue; 470 /* Match the full socket address */ 471 if (!nfs_sockaddr_cmp(sap, clap)) 472 continue; 473 474 atomic_inc(&clp->cl_count); 475 return clp; 476 } 477 return NULL; 478 } 479 480 /* 481 * Look up a client by IP address and protocol version 482 * - creates a new record if one doesn't yet exist 483 */ 484 static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_init) 485 { 486 struct nfs_client *clp, *new = NULL; 487 int error; 488 489 dprintk("--> nfs_get_client(%s,v%u)\n", 490 cl_init->hostname ?: "", cl_init->rpc_ops->version); 491 492 /* see if the client already exists */ 493 do { 494 spin_lock(&nfs_client_lock); 495 496 clp = nfs_match_client(cl_init); 497 if (clp) 498 goto found_client; 499 if (new) 500 goto install_client; 501 502 spin_unlock(&nfs_client_lock); 503 504 new = nfs_alloc_client(cl_init); 505 } while (!IS_ERR(new)); 506 507 dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new)); 508 return new; 509 510 /* install a new client and return with it unready */ 511 install_client: 512 clp = new; 513 list_add(&clp->cl_share_link, &nfs_client_list); 514 spin_unlock(&nfs_client_lock); 515 dprintk("--> nfs_get_client() = %p [new]\n", clp); 516 return clp; 517 518 /* found an existing client 519 * - make sure it's ready before returning 520 */ 521 found_client: 522 spin_unlock(&nfs_client_lock); 523 524 if (new) 525 nfs_free_client(new); 526 527 error = wait_event_killable(nfs_client_active_wq, 528 clp->cl_cons_state < NFS_CS_INITING); 529 if (error < 0) { 530 nfs_put_client(clp); 531 return ERR_PTR(-ERESTARTSYS); 532 } 533 534 if (clp->cl_cons_state < NFS_CS_READY) { 535 error = clp->cl_cons_state; 536 nfs_put_client(clp); 537 return ERR_PTR(error); 538 } 539 540 BUG_ON(clp->cl_cons_state != NFS_CS_READY); 541 542 dprintk("--> nfs_get_client() = %p [share]\n", clp); 543 return clp; 544 } 545 546 /* 547 * Mark a server as ready or failed 548 */ 549 void nfs_mark_client_ready(struct nfs_client *clp, int state) 550 { 551 clp->cl_cons_state = state; 552 wake_up_all(&nfs_client_active_wq); 553 } 554 555 /* 556 * With sessions, the client is not marked ready until after a 557 * successful EXCHANGE_ID and CREATE_SESSION. 558 * 559 * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate 560 * other versions of NFS can be tried. 561 */ 562 int nfs4_check_client_ready(struct nfs_client *clp) 563 { 564 if (!nfs4_has_session(clp)) 565 return 0; 566 if (clp->cl_cons_state < NFS_CS_READY) 567 return -EPROTONOSUPPORT; 568 return 0; 569 } 570 571 /* 572 * Initialise the timeout values for a connection 573 */ 574 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, 575 unsigned int timeo, unsigned int retrans) 576 { 577 to->to_initval = timeo * HZ / 10; 578 to->to_retries = retrans; 579 580 switch (proto) { 581 case XPRT_TRANSPORT_TCP: 582 case XPRT_TRANSPORT_RDMA: 583 if (to->to_retries == 0) 584 to->to_retries = NFS_DEF_TCP_RETRANS; 585 if (to->to_initval == 0) 586 to->to_initval = NFS_DEF_TCP_TIMEO * HZ / 10; 587 if (to->to_initval > NFS_MAX_TCP_TIMEOUT) 588 to->to_initval = NFS_MAX_TCP_TIMEOUT; 589 to->to_increment = to->to_initval; 590 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); 591 if (to->to_maxval > NFS_MAX_TCP_TIMEOUT) 592 to->to_maxval = NFS_MAX_TCP_TIMEOUT; 593 if (to->to_maxval < to->to_initval) 594 to->to_maxval = to->to_initval; 595 to->to_exponential = 0; 596 break; 597 case XPRT_TRANSPORT_UDP: 598 if (to->to_retries == 0) 599 to->to_retries = NFS_DEF_UDP_RETRANS; 600 if (!to->to_initval) 601 to->to_initval = NFS_DEF_UDP_TIMEO * HZ / 10; 602 if (to->to_initval > NFS_MAX_UDP_TIMEOUT) 603 to->to_initval = NFS_MAX_UDP_TIMEOUT; 604 to->to_maxval = NFS_MAX_UDP_TIMEOUT; 605 to->to_exponential = 1; 606 break; 607 default: 608 BUG(); 609 } 610 } 611 612 /* 613 * Create an RPC client handle 614 */ 615 static int nfs_create_rpc_client(struct nfs_client *clp, 616 const struct rpc_timeout *timeparms, 617 rpc_authflavor_t flavor, 618 int discrtry, int noresvport) 619 { 620 struct rpc_clnt *clnt = NULL; 621 struct rpc_create_args args = { 622 .net = &init_net, 623 .protocol = clp->cl_proto, 624 .address = (struct sockaddr *)&clp->cl_addr, 625 .addrsize = clp->cl_addrlen, 626 .timeout = timeparms, 627 .servername = clp->cl_hostname, 628 .program = &nfs_program, 629 .version = clp->rpc_ops->version, 630 .authflavor = flavor, 631 }; 632 633 if (discrtry) 634 args.flags |= RPC_CLNT_CREATE_DISCRTRY; 635 if (noresvport) 636 args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; 637 638 if (!IS_ERR(clp->cl_rpcclient)) 639 return 0; 640 641 clnt = rpc_create(&args); 642 if (IS_ERR(clnt)) { 643 dprintk("%s: cannot create RPC client. Error = %ld\n", 644 __func__, PTR_ERR(clnt)); 645 return PTR_ERR(clnt); 646 } 647 648 clp->cl_rpcclient = clnt; 649 return 0; 650 } 651 652 /* 653 * Version 2 or 3 client destruction 654 */ 655 static void nfs_destroy_server(struct nfs_server *server) 656 { 657 if (!(server->flags & NFS_MOUNT_LOCAL_FLOCK) || 658 !(server->flags & NFS_MOUNT_LOCAL_FCNTL)) 659 nlmclnt_done(server->nlm_host); 660 } 661 662 /* 663 * Version 2 or 3 lockd setup 664 */ 665 static int nfs_start_lockd(struct nfs_server *server) 666 { 667 struct nlm_host *host; 668 struct nfs_client *clp = server->nfs_client; 669 struct nlmclnt_initdata nlm_init = { 670 .hostname = clp->cl_hostname, 671 .address = (struct sockaddr *)&clp->cl_addr, 672 .addrlen = clp->cl_addrlen, 673 .nfs_version = clp->rpc_ops->version, 674 .noresvport = server->flags & NFS_MOUNT_NORESVPORT ? 675 1 : 0, 676 }; 677 678 if (nlm_init.nfs_version > 3) 679 return 0; 680 if ((server->flags & NFS_MOUNT_LOCAL_FLOCK) && 681 (server->flags & NFS_MOUNT_LOCAL_FCNTL)) 682 return 0; 683 684 switch (clp->cl_proto) { 685 default: 686 nlm_init.protocol = IPPROTO_TCP; 687 break; 688 case XPRT_TRANSPORT_UDP: 689 nlm_init.protocol = IPPROTO_UDP; 690 } 691 692 host = nlmclnt_init(&nlm_init); 693 if (IS_ERR(host)) 694 return PTR_ERR(host); 695 696 server->nlm_host = host; 697 server->destroy = nfs_destroy_server; 698 return 0; 699 } 700 701 /* 702 * Initialise an NFSv3 ACL client connection 703 */ 704 #ifdef CONFIG_NFS_V3_ACL 705 static void nfs_init_server_aclclient(struct nfs_server *server) 706 { 707 if (server->nfs_client->rpc_ops->version != 3) 708 goto out_noacl; 709 if (server->flags & NFS_MOUNT_NOACL) 710 goto out_noacl; 711 712 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); 713 if (IS_ERR(server->client_acl)) 714 goto out_noacl; 715 716 /* No errors! Assume that Sun nfsacls are supported */ 717 server->caps |= NFS_CAP_ACLS; 718 return; 719 720 out_noacl: 721 server->caps &= ~NFS_CAP_ACLS; 722 } 723 #else 724 static inline void nfs_init_server_aclclient(struct nfs_server *server) 725 { 726 server->flags &= ~NFS_MOUNT_NOACL; 727 server->caps &= ~NFS_CAP_ACLS; 728 } 729 #endif 730 731 /* 732 * Create a general RPC client 733 */ 734 static int nfs_init_server_rpcclient(struct nfs_server *server, 735 const struct rpc_timeout *timeo, 736 rpc_authflavor_t pseudoflavour) 737 { 738 struct nfs_client *clp = server->nfs_client; 739 740 server->client = rpc_clone_client(clp->cl_rpcclient); 741 if (IS_ERR(server->client)) { 742 dprintk("%s: couldn't create rpc_client!\n", __func__); 743 return PTR_ERR(server->client); 744 } 745 746 memcpy(&server->client->cl_timeout_default, 747 timeo, 748 sizeof(server->client->cl_timeout_default)); 749 server->client->cl_timeout = &server->client->cl_timeout_default; 750 751 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) { 752 struct rpc_auth *auth; 753 754 auth = rpcauth_create(pseudoflavour, server->client); 755 if (IS_ERR(auth)) { 756 dprintk("%s: couldn't create credcache!\n", __func__); 757 return PTR_ERR(auth); 758 } 759 } 760 server->client->cl_softrtry = 0; 761 if (server->flags & NFS_MOUNT_SOFT) 762 server->client->cl_softrtry = 1; 763 764 return 0; 765 } 766 767 /* 768 * Initialise an NFS2 or NFS3 client 769 */ 770 static int nfs_init_client(struct nfs_client *clp, 771 const struct rpc_timeout *timeparms, 772 const struct nfs_parsed_mount_data *data) 773 { 774 int error; 775 776 if (clp->cl_cons_state == NFS_CS_READY) { 777 /* the client is already initialised */ 778 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp); 779 return 0; 780 } 781 782 /* 783 * Create a client RPC handle for doing FSSTAT with UNIX auth only 784 * - RFC 2623, sec 2.3.2 785 */ 786 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX, 787 0, data->flags & NFS_MOUNT_NORESVPORT); 788 if (error < 0) 789 goto error; 790 nfs_mark_client_ready(clp, NFS_CS_READY); 791 return 0; 792 793 error: 794 nfs_mark_client_ready(clp, error); 795 dprintk("<-- nfs_init_client() = xerror %d\n", error); 796 return error; 797 } 798 799 /* 800 * Create a version 2 or 3 client 801 */ 802 static int nfs_init_server(struct nfs_server *server, 803 const struct nfs_parsed_mount_data *data) 804 { 805 struct nfs_client_initdata cl_init = { 806 .hostname = data->nfs_server.hostname, 807 .addr = (const struct sockaddr *)&data->nfs_server.address, 808 .addrlen = data->nfs_server.addrlen, 809 .rpc_ops = &nfs_v2_clientops, 810 .proto = data->nfs_server.protocol, 811 }; 812 struct rpc_timeout timeparms; 813 struct nfs_client *clp; 814 int error; 815 816 dprintk("--> nfs_init_server()\n"); 817 818 #ifdef CONFIG_NFS_V3 819 if (data->version == 3) 820 cl_init.rpc_ops = &nfs_v3_clientops; 821 #endif 822 823 /* Allocate or find a client reference we can use */ 824 clp = nfs_get_client(&cl_init); 825 if (IS_ERR(clp)) { 826 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp)); 827 return PTR_ERR(clp); 828 } 829 830 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 831 data->timeo, data->retrans); 832 error = nfs_init_client(clp, &timeparms, data); 833 if (error < 0) 834 goto error; 835 836 server->nfs_client = clp; 837 838 /* Initialise the client representation from the mount data */ 839 server->flags = data->flags; 840 server->options = data->options; 841 server->caps |= NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID| 842 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|NFS_CAP_OWNER_GROUP| 843 NFS_CAP_ATIME|NFS_CAP_CTIME|NFS_CAP_MTIME; 844 845 if (data->rsize) 846 server->rsize = nfs_block_size(data->rsize, NULL); 847 if (data->wsize) 848 server->wsize = nfs_block_size(data->wsize, NULL); 849 850 server->acregmin = data->acregmin * HZ; 851 server->acregmax = data->acregmax * HZ; 852 server->acdirmin = data->acdirmin * HZ; 853 server->acdirmax = data->acdirmax * HZ; 854 855 /* Start lockd here, before we might error out */ 856 error = nfs_start_lockd(server); 857 if (error < 0) 858 goto error; 859 860 server->port = data->nfs_server.port; 861 862 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 863 if (error < 0) 864 goto error; 865 866 /* Preserve the values of mount_server-related mount options */ 867 if (data->mount_server.addrlen) { 868 memcpy(&server->mountd_address, &data->mount_server.address, 869 data->mount_server.addrlen); 870 server->mountd_addrlen = data->mount_server.addrlen; 871 } 872 server->mountd_version = data->mount_server.version; 873 server->mountd_port = data->mount_server.port; 874 server->mountd_protocol = data->mount_server.protocol; 875 876 server->namelen = data->namlen; 877 /* Create a client RPC handle for the NFSv3 ACL management interface */ 878 nfs_init_server_aclclient(server); 879 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp); 880 return 0; 881 882 error: 883 server->nfs_client = NULL; 884 nfs_put_client(clp); 885 dprintk("<-- nfs_init_server() = xerror %d\n", error); 886 return error; 887 } 888 889 /* 890 * Load up the server record from information gained in an fsinfo record 891 */ 892 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo) 893 { 894 unsigned long max_rpc_payload; 895 896 /* Work out a lot of parameters */ 897 if (server->rsize == 0) 898 server->rsize = nfs_block_size(fsinfo->rtpref, NULL); 899 if (server->wsize == 0) 900 server->wsize = nfs_block_size(fsinfo->wtpref, NULL); 901 902 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax) 903 server->rsize = nfs_block_size(fsinfo->rtmax, NULL); 904 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax) 905 server->wsize = nfs_block_size(fsinfo->wtmax, NULL); 906 907 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); 908 if (server->rsize > max_rpc_payload) 909 server->rsize = max_rpc_payload; 910 if (server->rsize > NFS_MAX_FILE_IO_SIZE) 911 server->rsize = NFS_MAX_FILE_IO_SIZE; 912 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 913 914 server->backing_dev_info.name = "nfs"; 915 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; 916 917 if (server->wsize > max_rpc_payload) 918 server->wsize = max_rpc_payload; 919 if (server->wsize > NFS_MAX_FILE_IO_SIZE) 920 server->wsize = NFS_MAX_FILE_IO_SIZE; 921 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 922 set_pnfs_layoutdriver(server, fsinfo->layouttype); 923 924 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL); 925 926 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL); 927 if (server->dtsize > PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES) 928 server->dtsize = PAGE_CACHE_SIZE * NFS_MAX_READDIR_PAGES; 929 if (server->dtsize > server->rsize) 930 server->dtsize = server->rsize; 931 932 if (server->flags & NFS_MOUNT_NOAC) { 933 server->acregmin = server->acregmax = 0; 934 server->acdirmin = server->acdirmax = 0; 935 } 936 937 server->maxfilesize = fsinfo->maxfilesize; 938 939 server->time_delta = fsinfo->time_delta; 940 941 /* We're airborne Set socket buffersize */ 942 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); 943 } 944 945 /* 946 * Probe filesystem information, including the FSID on v2/v3 947 */ 948 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr) 949 { 950 struct nfs_fsinfo fsinfo; 951 struct nfs_client *clp = server->nfs_client; 952 int error; 953 954 dprintk("--> nfs_probe_fsinfo()\n"); 955 956 if (clp->rpc_ops->set_capabilities != NULL) { 957 error = clp->rpc_ops->set_capabilities(server, mntfh); 958 if (error < 0) 959 goto out_error; 960 } 961 962 fsinfo.fattr = fattr; 963 fsinfo.layouttype = 0; 964 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); 965 if (error < 0) 966 goto out_error; 967 968 nfs_server_set_fsinfo(server, &fsinfo); 969 970 /* Get some general file system info */ 971 if (server->namelen == 0) { 972 struct nfs_pathconf pathinfo; 973 974 pathinfo.fattr = fattr; 975 nfs_fattr_init(fattr); 976 977 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0) 978 server->namelen = pathinfo.max_namelen; 979 } 980 981 dprintk("<-- nfs_probe_fsinfo() = 0\n"); 982 return 0; 983 984 out_error: 985 dprintk("nfs_probe_fsinfo: error = %d\n", -error); 986 return error; 987 } 988 989 /* 990 * Copy useful information when duplicating a server record 991 */ 992 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source) 993 { 994 target->flags = source->flags; 995 target->rsize = source->rsize; 996 target->wsize = source->wsize; 997 target->acregmin = source->acregmin; 998 target->acregmax = source->acregmax; 999 target->acdirmin = source->acdirmin; 1000 target->acdirmax = source->acdirmax; 1001 target->caps = source->caps; 1002 target->options = source->options; 1003 } 1004 1005 static void nfs_server_insert_lists(struct nfs_server *server) 1006 { 1007 struct nfs_client *clp = server->nfs_client; 1008 1009 spin_lock(&nfs_client_lock); 1010 list_add_tail_rcu(&server->client_link, &clp->cl_superblocks); 1011 list_add_tail(&server->master_link, &nfs_volume_list); 1012 spin_unlock(&nfs_client_lock); 1013 1014 } 1015 1016 static void nfs_server_remove_lists(struct nfs_server *server) 1017 { 1018 spin_lock(&nfs_client_lock); 1019 list_del_rcu(&server->client_link); 1020 list_del(&server->master_link); 1021 spin_unlock(&nfs_client_lock); 1022 1023 synchronize_rcu(); 1024 } 1025 1026 /* 1027 * Allocate and initialise a server record 1028 */ 1029 static struct nfs_server *nfs_alloc_server(void) 1030 { 1031 struct nfs_server *server; 1032 1033 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); 1034 if (!server) 1035 return NULL; 1036 1037 server->client = server->client_acl = ERR_PTR(-EINVAL); 1038 1039 /* Zero out the NFS state stuff */ 1040 INIT_LIST_HEAD(&server->client_link); 1041 INIT_LIST_HEAD(&server->master_link); 1042 INIT_LIST_HEAD(&server->delegations); 1043 1044 atomic_set(&server->active, 0); 1045 1046 server->io_stats = nfs_alloc_iostats(); 1047 if (!server->io_stats) { 1048 kfree(server); 1049 return NULL; 1050 } 1051 1052 if (bdi_init(&server->backing_dev_info)) { 1053 nfs_free_iostats(server->io_stats); 1054 kfree(server); 1055 return NULL; 1056 } 1057 1058 pnfs_init_server(server); 1059 1060 return server; 1061 } 1062 1063 /* 1064 * Free up a server record 1065 */ 1066 void nfs_free_server(struct nfs_server *server) 1067 { 1068 dprintk("--> nfs_free_server()\n"); 1069 1070 nfs_server_remove_lists(server); 1071 unset_pnfs_layoutdriver(server); 1072 1073 if (server->destroy != NULL) 1074 server->destroy(server); 1075 1076 if (!IS_ERR(server->client_acl)) 1077 rpc_shutdown_client(server->client_acl); 1078 if (!IS_ERR(server->client)) 1079 rpc_shutdown_client(server->client); 1080 1081 nfs_put_client(server->nfs_client); 1082 1083 nfs_free_iostats(server->io_stats); 1084 bdi_destroy(&server->backing_dev_info); 1085 kfree(server); 1086 nfs_release_automount_timer(); 1087 dprintk("<-- nfs_free_server()\n"); 1088 } 1089 1090 /* 1091 * Create a version 2 or 3 volume record 1092 * - keyed on server and FSID 1093 */ 1094 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data, 1095 struct nfs_fh *mntfh) 1096 { 1097 struct nfs_server *server; 1098 struct nfs_fattr *fattr; 1099 int error; 1100 1101 server = nfs_alloc_server(); 1102 if (!server) 1103 return ERR_PTR(-ENOMEM); 1104 1105 error = -ENOMEM; 1106 fattr = nfs_alloc_fattr(); 1107 if (fattr == NULL) 1108 goto error; 1109 1110 /* Get a client representation */ 1111 error = nfs_init_server(server, data); 1112 if (error < 0) 1113 goto error; 1114 1115 BUG_ON(!server->nfs_client); 1116 BUG_ON(!server->nfs_client->rpc_ops); 1117 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1118 1119 /* Probe the root fh to retrieve its FSID */ 1120 error = nfs_probe_fsinfo(server, mntfh, fattr); 1121 if (error < 0) 1122 goto error; 1123 if (server->nfs_client->rpc_ops->version == 3) { 1124 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) 1125 server->namelen = NFS3_MAXNAMLEN; 1126 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1127 server->caps |= NFS_CAP_READDIRPLUS; 1128 } else { 1129 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) 1130 server->namelen = NFS2_MAXNAMLEN; 1131 } 1132 1133 if (!(fattr->valid & NFS_ATTR_FATTR)) { 1134 error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr); 1135 if (error < 0) { 1136 dprintk("nfs_create_server: getattr error = %d\n", -error); 1137 goto error; 1138 } 1139 } 1140 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 1141 1142 dprintk("Server FSID: %llx:%llx\n", 1143 (unsigned long long) server->fsid.major, 1144 (unsigned long long) server->fsid.minor); 1145 1146 nfs_server_insert_lists(server); 1147 server->mount_time = jiffies; 1148 nfs_free_fattr(fattr); 1149 return server; 1150 1151 error: 1152 nfs_free_fattr(fattr); 1153 nfs_free_server(server); 1154 return ERR_PTR(error); 1155 } 1156 1157 #ifdef CONFIG_NFS_V4 1158 /* 1159 * NFSv4.0 callback thread helper 1160 * 1161 * Find a client by IP address, protocol version, and minorversion 1162 * 1163 * Called from the pg_authenticate method. The callback identifier 1164 * is not used as it has not been decoded. 1165 * 1166 * Returns NULL if no such client 1167 */ 1168 struct nfs_client * 1169 nfs4_find_client_no_ident(const struct sockaddr *addr) 1170 { 1171 struct nfs_client *clp; 1172 1173 spin_lock(&nfs_client_lock); 1174 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1175 if (nfs4_cb_match_client(addr, clp, 0) == false) 1176 continue; 1177 atomic_inc(&clp->cl_count); 1178 spin_unlock(&nfs_client_lock); 1179 return clp; 1180 } 1181 spin_unlock(&nfs_client_lock); 1182 return NULL; 1183 } 1184 1185 /* 1186 * NFSv4.0 callback thread helper 1187 * 1188 * Find a client by callback identifier 1189 */ 1190 struct nfs_client * 1191 nfs4_find_client_ident(int cb_ident) 1192 { 1193 struct nfs_client *clp; 1194 1195 spin_lock(&nfs_client_lock); 1196 clp = idr_find(&cb_ident_idr, cb_ident); 1197 if (clp) 1198 atomic_inc(&clp->cl_count); 1199 spin_unlock(&nfs_client_lock); 1200 return clp; 1201 } 1202 1203 #if defined(CONFIG_NFS_V4_1) 1204 /* 1205 * NFSv4.1 callback thread helper 1206 * For CB_COMPOUND calls, find a client by IP address, protocol version, 1207 * minorversion, and sessionID 1208 * 1209 * Returns NULL if no such client 1210 */ 1211 struct nfs_client * 1212 nfs4_find_client_sessionid(const struct sockaddr *addr, 1213 struct nfs4_sessionid *sid) 1214 { 1215 struct nfs_client *clp; 1216 1217 spin_lock(&nfs_client_lock); 1218 list_for_each_entry(clp, &nfs_client_list, cl_share_link) { 1219 if (nfs4_cb_match_client(addr, clp, 1) == false) 1220 continue; 1221 1222 if (!nfs4_has_session(clp)) 1223 continue; 1224 1225 /* Match sessionid*/ 1226 if (memcmp(clp->cl_session->sess_id.data, 1227 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 1228 continue; 1229 1230 atomic_inc(&clp->cl_count); 1231 spin_unlock(&nfs_client_lock); 1232 return clp; 1233 } 1234 spin_unlock(&nfs_client_lock); 1235 return NULL; 1236 } 1237 1238 #else /* CONFIG_NFS_V4_1 */ 1239 1240 struct nfs_client * 1241 nfs4_find_client_sessionid(const struct sockaddr *addr, 1242 struct nfs4_sessionid *sid) 1243 { 1244 return NULL; 1245 } 1246 #endif /* CONFIG_NFS_V4_1 */ 1247 1248 /* 1249 * Initialize the NFS4 callback service 1250 */ 1251 static int nfs4_init_callback(struct nfs_client *clp) 1252 { 1253 int error; 1254 1255 if (clp->rpc_ops->version == 4) { 1256 if (nfs4_has_session(clp)) { 1257 error = xprt_setup_backchannel( 1258 clp->cl_rpcclient->cl_xprt, 1259 NFS41_BC_MIN_CALLBACKS); 1260 if (error < 0) 1261 return error; 1262 } 1263 1264 error = nfs_callback_up(clp->cl_mvops->minor_version, 1265 clp->cl_rpcclient->cl_xprt); 1266 if (error < 0) { 1267 dprintk("%s: failed to start callback. Error = %d\n", 1268 __func__, error); 1269 return error; 1270 } 1271 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 1272 } 1273 return 0; 1274 } 1275 1276 /* 1277 * Initialize the minor version specific parts of an NFS4 client record 1278 */ 1279 static int nfs4_init_client_minor_version(struct nfs_client *clp) 1280 { 1281 #if defined(CONFIG_NFS_V4_1) 1282 if (clp->cl_mvops->minor_version) { 1283 struct nfs4_session *session = NULL; 1284 /* 1285 * Create the session and mark it expired. 1286 * When a SEQUENCE operation encounters the expired session 1287 * it will do session recovery to initialize it. 1288 */ 1289 session = nfs4_alloc_session(clp); 1290 if (!session) 1291 return -ENOMEM; 1292 1293 clp->cl_session = session; 1294 /* 1295 * The create session reply races with the server back 1296 * channel probe. Mark the client NFS_CS_SESSION_INITING 1297 * so that the client back channel can find the 1298 * nfs_client struct 1299 */ 1300 clp->cl_cons_state = NFS_CS_SESSION_INITING; 1301 } 1302 #endif /* CONFIG_NFS_V4_1 */ 1303 1304 return nfs4_init_callback(clp); 1305 } 1306 1307 /* 1308 * Initialise an NFS4 client record 1309 */ 1310 static int nfs4_init_client(struct nfs_client *clp, 1311 const struct rpc_timeout *timeparms, 1312 const char *ip_addr, 1313 rpc_authflavor_t authflavour, 1314 int flags) 1315 { 1316 int error; 1317 1318 if (clp->cl_cons_state == NFS_CS_READY) { 1319 /* the client is initialised already */ 1320 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 1321 return 0; 1322 } 1323 1324 /* Check NFS protocol revision and initialize RPC op vector */ 1325 clp->rpc_ops = &nfs_v4_clientops; 1326 1327 error = nfs_create_rpc_client(clp, timeparms, authflavour, 1328 1, flags & NFS_MOUNT_NORESVPORT); 1329 if (error < 0) 1330 goto error; 1331 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 1332 1333 error = nfs_idmap_new(clp); 1334 if (error < 0) { 1335 dprintk("%s: failed to create idmapper. Error = %d\n", 1336 __func__, error); 1337 goto error; 1338 } 1339 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 1340 1341 error = nfs4_init_client_minor_version(clp); 1342 if (error < 0) 1343 goto error; 1344 1345 if (!nfs4_has_session(clp)) 1346 nfs_mark_client_ready(clp, NFS_CS_READY); 1347 return 0; 1348 1349 error: 1350 nfs_mark_client_ready(clp, error); 1351 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 1352 return error; 1353 } 1354 1355 /* 1356 * Set up an NFS4 client 1357 */ 1358 static int nfs4_set_client(struct nfs_server *server, 1359 const char *hostname, 1360 const struct sockaddr *addr, 1361 const size_t addrlen, 1362 const char *ip_addr, 1363 rpc_authflavor_t authflavour, 1364 int proto, const struct rpc_timeout *timeparms, 1365 u32 minorversion) 1366 { 1367 struct nfs_client_initdata cl_init = { 1368 .hostname = hostname, 1369 .addr = addr, 1370 .addrlen = addrlen, 1371 .rpc_ops = &nfs_v4_clientops, 1372 .proto = proto, 1373 .minorversion = minorversion, 1374 }; 1375 struct nfs_client *clp; 1376 int error; 1377 1378 dprintk("--> nfs4_set_client()\n"); 1379 1380 /* Allocate or find a client reference we can use */ 1381 clp = nfs_get_client(&cl_init); 1382 if (IS_ERR(clp)) { 1383 error = PTR_ERR(clp); 1384 goto error; 1385 } 1386 error = nfs4_init_client(clp, timeparms, ip_addr, authflavour, 1387 server->flags); 1388 if (error < 0) 1389 goto error_put; 1390 1391 server->nfs_client = clp; 1392 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 1393 return 0; 1394 1395 error_put: 1396 nfs_put_client(clp); 1397 error: 1398 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 1399 return error; 1400 } 1401 1402 1403 /* 1404 * Session has been established, and the client marked ready. 1405 * Set the mount rsize and wsize with negotiated fore channel 1406 * attributes which will be bound checked in nfs_server_set_fsinfo. 1407 */ 1408 static void nfs4_session_set_rwsize(struct nfs_server *server) 1409 { 1410 #ifdef CONFIG_NFS_V4_1 1411 struct nfs4_session *sess; 1412 u32 server_resp_sz; 1413 u32 server_rqst_sz; 1414 1415 if (!nfs4_has_session(server->nfs_client)) 1416 return; 1417 sess = server->nfs_client->cl_session; 1418 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1419 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1420 1421 if (server->rsize > server_resp_sz) 1422 server->rsize = server_resp_sz; 1423 if (server->wsize > server_rqst_sz) 1424 server->wsize = server_rqst_sz; 1425 #endif /* CONFIG_NFS_V4_1 */ 1426 } 1427 1428 static int nfs4_server_common_setup(struct nfs_server *server, 1429 struct nfs_fh *mntfh) 1430 { 1431 struct nfs_fattr *fattr; 1432 int error; 1433 1434 BUG_ON(!server->nfs_client); 1435 BUG_ON(!server->nfs_client->rpc_ops); 1436 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); 1437 1438 fattr = nfs_alloc_fattr(); 1439 if (fattr == NULL) 1440 return -ENOMEM; 1441 1442 /* We must ensure the session is initialised first */ 1443 error = nfs4_init_session(server); 1444 if (error < 0) 1445 goto out; 1446 1447 /* Probe the root fh to retrieve its FSID and filehandle */ 1448 error = nfs4_get_rootfh(server, mntfh); 1449 if (error < 0) 1450 goto out; 1451 1452 dprintk("Server FSID: %llx:%llx\n", 1453 (unsigned long long) server->fsid.major, 1454 (unsigned long long) server->fsid.minor); 1455 dprintk("Mount FH: %d\n", mntfh->size); 1456 1457 nfs4_session_set_rwsize(server); 1458 1459 error = nfs_probe_fsinfo(server, mntfh, fattr); 1460 if (error < 0) 1461 goto out; 1462 1463 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1464 server->namelen = NFS4_MAXNAMLEN; 1465 1466 nfs_server_insert_lists(server); 1467 server->mount_time = jiffies; 1468 out: 1469 nfs_free_fattr(fattr); 1470 return error; 1471 } 1472 1473 /* 1474 * Create a version 4 volume record 1475 */ 1476 static int nfs4_init_server(struct nfs_server *server, 1477 const struct nfs_parsed_mount_data *data) 1478 { 1479 struct rpc_timeout timeparms; 1480 int error; 1481 1482 dprintk("--> nfs4_init_server()\n"); 1483 1484 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1485 data->timeo, data->retrans); 1486 1487 /* Initialise the client representation from the mount data */ 1488 server->flags = data->flags; 1489 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; 1490 if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) 1491 server->caps |= NFS_CAP_READDIRPLUS; 1492 server->options = data->options; 1493 1494 /* Get a client record */ 1495 error = nfs4_set_client(server, 1496 data->nfs_server.hostname, 1497 (const struct sockaddr *)&data->nfs_server.address, 1498 data->nfs_server.addrlen, 1499 data->client_address, 1500 data->auth_flavors[0], 1501 data->nfs_server.protocol, 1502 &timeparms, 1503 data->minorversion); 1504 if (error < 0) 1505 goto error; 1506 1507 if (data->rsize) 1508 server->rsize = nfs_block_size(data->rsize, NULL); 1509 if (data->wsize) 1510 server->wsize = nfs_block_size(data->wsize, NULL); 1511 1512 server->acregmin = data->acregmin * HZ; 1513 server->acregmax = data->acregmax * HZ; 1514 server->acdirmin = data->acdirmin * HZ; 1515 server->acdirmax = data->acdirmax * HZ; 1516 1517 server->port = data->nfs_server.port; 1518 1519 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); 1520 1521 error: 1522 /* Done */ 1523 dprintk("<-- nfs4_init_server() = %d\n", error); 1524 return error; 1525 } 1526 1527 /* 1528 * Create a version 4 volume record 1529 * - keyed on server and FSID 1530 */ 1531 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1532 struct nfs_fh *mntfh) 1533 { 1534 struct nfs_server *server; 1535 int error; 1536 1537 dprintk("--> nfs4_create_server()\n"); 1538 1539 server = nfs_alloc_server(); 1540 if (!server) 1541 return ERR_PTR(-ENOMEM); 1542 1543 /* set up the general RPC client */ 1544 error = nfs4_init_server(server, data); 1545 if (error < 0) 1546 goto error; 1547 1548 error = nfs4_server_common_setup(server, mntfh); 1549 if (error < 0) 1550 goto error; 1551 1552 dprintk("<-- nfs4_create_server() = %p\n", server); 1553 return server; 1554 1555 error: 1556 nfs_free_server(server); 1557 dprintk("<-- nfs4_create_server() = error %d\n", error); 1558 return ERR_PTR(error); 1559 } 1560 1561 /* 1562 * Create an NFS4 referral server record 1563 */ 1564 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1565 struct nfs_fh *mntfh) 1566 { 1567 struct nfs_client *parent_client; 1568 struct nfs_server *server, *parent_server; 1569 int error; 1570 1571 dprintk("--> nfs4_create_referral_server()\n"); 1572 1573 server = nfs_alloc_server(); 1574 if (!server) 1575 return ERR_PTR(-ENOMEM); 1576 1577 parent_server = NFS_SB(data->sb); 1578 parent_client = parent_server->nfs_client; 1579 1580 /* Initialise the client representation from the parent server */ 1581 nfs_server_copy_userdata(server, parent_server); 1582 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; 1583 1584 /* Get a client representation. 1585 * Note: NFSv4 always uses TCP, */ 1586 error = nfs4_set_client(server, data->hostname, 1587 data->addr, 1588 data->addrlen, 1589 parent_client->cl_ipaddr, 1590 data->authflavor, 1591 parent_server->client->cl_xprt->prot, 1592 parent_server->client->cl_timeout, 1593 parent_client->cl_mvops->minor_version); 1594 if (error < 0) 1595 goto error; 1596 1597 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1598 if (error < 0) 1599 goto error; 1600 1601 error = nfs4_server_common_setup(server, mntfh); 1602 if (error < 0) 1603 goto error; 1604 1605 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1606 return server; 1607 1608 error: 1609 nfs_free_server(server); 1610 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1611 return ERR_PTR(error); 1612 } 1613 1614 #endif /* CONFIG_NFS_V4 */ 1615 1616 /* 1617 * Clone an NFS2, NFS3 or NFS4 server record 1618 */ 1619 struct nfs_server *nfs_clone_server(struct nfs_server *source, 1620 struct nfs_fh *fh, 1621 struct nfs_fattr *fattr) 1622 { 1623 struct nfs_server *server; 1624 struct nfs_fattr *fattr_fsinfo; 1625 int error; 1626 1627 dprintk("--> nfs_clone_server(,%llx:%llx,)\n", 1628 (unsigned long long) fattr->fsid.major, 1629 (unsigned long long) fattr->fsid.minor); 1630 1631 server = nfs_alloc_server(); 1632 if (!server) 1633 return ERR_PTR(-ENOMEM); 1634 1635 error = -ENOMEM; 1636 fattr_fsinfo = nfs_alloc_fattr(); 1637 if (fattr_fsinfo == NULL) 1638 goto out_free_server; 1639 1640 /* Copy data from the source */ 1641 server->nfs_client = source->nfs_client; 1642 atomic_inc(&server->nfs_client->cl_count); 1643 nfs_server_copy_userdata(server, source); 1644 1645 server->fsid = fattr->fsid; 1646 1647 error = nfs_init_server_rpcclient(server, 1648 source->client->cl_timeout, 1649 source->client->cl_auth->au_flavor); 1650 if (error < 0) 1651 goto out_free_server; 1652 if (!IS_ERR(source->client_acl)) 1653 nfs_init_server_aclclient(server); 1654 1655 /* probe the filesystem info for this server filesystem */ 1656 error = nfs_probe_fsinfo(server, fh, fattr_fsinfo); 1657 if (error < 0) 1658 goto out_free_server; 1659 1660 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1661 server->namelen = NFS4_MAXNAMLEN; 1662 1663 dprintk("Cloned FSID: %llx:%llx\n", 1664 (unsigned long long) server->fsid.major, 1665 (unsigned long long) server->fsid.minor); 1666 1667 error = nfs_start_lockd(server); 1668 if (error < 0) 1669 goto out_free_server; 1670 1671 nfs_server_insert_lists(server); 1672 server->mount_time = jiffies; 1673 1674 nfs_free_fattr(fattr_fsinfo); 1675 dprintk("<-- nfs_clone_server() = %p\n", server); 1676 return server; 1677 1678 out_free_server: 1679 nfs_free_fattr(fattr_fsinfo); 1680 nfs_free_server(server); 1681 dprintk("<-- nfs_clone_server() = error %d\n", error); 1682 return ERR_PTR(error); 1683 } 1684 1685 #ifdef CONFIG_PROC_FS 1686 static struct proc_dir_entry *proc_fs_nfs; 1687 1688 static int nfs_server_list_open(struct inode *inode, struct file *file); 1689 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos); 1690 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos); 1691 static void nfs_server_list_stop(struct seq_file *p, void *v); 1692 static int nfs_server_list_show(struct seq_file *m, void *v); 1693 1694 static const struct seq_operations nfs_server_list_ops = { 1695 .start = nfs_server_list_start, 1696 .next = nfs_server_list_next, 1697 .stop = nfs_server_list_stop, 1698 .show = nfs_server_list_show, 1699 }; 1700 1701 static const struct file_operations nfs_server_list_fops = { 1702 .open = nfs_server_list_open, 1703 .read = seq_read, 1704 .llseek = seq_lseek, 1705 .release = seq_release, 1706 .owner = THIS_MODULE, 1707 }; 1708 1709 static int nfs_volume_list_open(struct inode *inode, struct file *file); 1710 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos); 1711 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos); 1712 static void nfs_volume_list_stop(struct seq_file *p, void *v); 1713 static int nfs_volume_list_show(struct seq_file *m, void *v); 1714 1715 static const struct seq_operations nfs_volume_list_ops = { 1716 .start = nfs_volume_list_start, 1717 .next = nfs_volume_list_next, 1718 .stop = nfs_volume_list_stop, 1719 .show = nfs_volume_list_show, 1720 }; 1721 1722 static const struct file_operations nfs_volume_list_fops = { 1723 .open = nfs_volume_list_open, 1724 .read = seq_read, 1725 .llseek = seq_lseek, 1726 .release = seq_release, 1727 .owner = THIS_MODULE, 1728 }; 1729 1730 /* 1731 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which 1732 * we're dealing 1733 */ 1734 static int nfs_server_list_open(struct inode *inode, struct file *file) 1735 { 1736 struct seq_file *m; 1737 int ret; 1738 1739 ret = seq_open(file, &nfs_server_list_ops); 1740 if (ret < 0) 1741 return ret; 1742 1743 m = file->private_data; 1744 m->private = PDE(inode)->data; 1745 1746 return 0; 1747 } 1748 1749 /* 1750 * set up the iterator to start reading from the server list and return the first item 1751 */ 1752 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos) 1753 { 1754 /* lock the list against modification */ 1755 spin_lock(&nfs_client_lock); 1756 return seq_list_start_head(&nfs_client_list, *_pos); 1757 } 1758 1759 /* 1760 * move to next server 1761 */ 1762 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos) 1763 { 1764 return seq_list_next(v, &nfs_client_list, pos); 1765 } 1766 1767 /* 1768 * clean up after reading from the transports list 1769 */ 1770 static void nfs_server_list_stop(struct seq_file *p, void *v) 1771 { 1772 spin_unlock(&nfs_client_lock); 1773 } 1774 1775 /* 1776 * display a header line followed by a load of call lines 1777 */ 1778 static int nfs_server_list_show(struct seq_file *m, void *v) 1779 { 1780 struct nfs_client *clp; 1781 1782 /* display header on line 1 */ 1783 if (v == &nfs_client_list) { 1784 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n"); 1785 return 0; 1786 } 1787 1788 /* display one transport per line on subsequent lines */ 1789 clp = list_entry(v, struct nfs_client, cl_share_link); 1790 1791 seq_printf(m, "v%u %s %s %3d %s\n", 1792 clp->rpc_ops->version, 1793 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1794 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1795 atomic_read(&clp->cl_count), 1796 clp->cl_hostname); 1797 1798 return 0; 1799 } 1800 1801 /* 1802 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes 1803 */ 1804 static int nfs_volume_list_open(struct inode *inode, struct file *file) 1805 { 1806 struct seq_file *m; 1807 int ret; 1808 1809 ret = seq_open(file, &nfs_volume_list_ops); 1810 if (ret < 0) 1811 return ret; 1812 1813 m = file->private_data; 1814 m->private = PDE(inode)->data; 1815 1816 return 0; 1817 } 1818 1819 /* 1820 * set up the iterator to start reading from the volume list and return the first item 1821 */ 1822 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos) 1823 { 1824 /* lock the list against modification */ 1825 spin_lock(&nfs_client_lock); 1826 return seq_list_start_head(&nfs_volume_list, *_pos); 1827 } 1828 1829 /* 1830 * move to next volume 1831 */ 1832 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos) 1833 { 1834 return seq_list_next(v, &nfs_volume_list, pos); 1835 } 1836 1837 /* 1838 * clean up after reading from the transports list 1839 */ 1840 static void nfs_volume_list_stop(struct seq_file *p, void *v) 1841 { 1842 spin_unlock(&nfs_client_lock); 1843 } 1844 1845 /* 1846 * display a header line followed by a load of call lines 1847 */ 1848 static int nfs_volume_list_show(struct seq_file *m, void *v) 1849 { 1850 struct nfs_server *server; 1851 struct nfs_client *clp; 1852 char dev[8], fsid[17]; 1853 1854 /* display header on line 1 */ 1855 if (v == &nfs_volume_list) { 1856 seq_puts(m, "NV SERVER PORT DEV FSID FSC\n"); 1857 return 0; 1858 } 1859 /* display one transport per line on subsequent lines */ 1860 server = list_entry(v, struct nfs_server, master_link); 1861 clp = server->nfs_client; 1862 1863 snprintf(dev, 8, "%u:%u", 1864 MAJOR(server->s_dev), MINOR(server->s_dev)); 1865 1866 snprintf(fsid, 17, "%llx:%llx", 1867 (unsigned long long) server->fsid.major, 1868 (unsigned long long) server->fsid.minor); 1869 1870 seq_printf(m, "v%u %s %s %-7s %-17s %s\n", 1871 clp->rpc_ops->version, 1872 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_ADDR), 1873 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_HEX_PORT), 1874 dev, 1875 fsid, 1876 nfs_server_fscache_state(server)); 1877 1878 return 0; 1879 } 1880 1881 /* 1882 * initialise the /proc/fs/nfsfs/ directory 1883 */ 1884 int __init nfs_fs_proc_init(void) 1885 { 1886 struct proc_dir_entry *p; 1887 1888 proc_fs_nfs = proc_mkdir("fs/nfsfs", NULL); 1889 if (!proc_fs_nfs) 1890 goto error_0; 1891 1892 /* a file of servers with which we're dealing */ 1893 p = proc_create("servers", S_IFREG|S_IRUGO, 1894 proc_fs_nfs, &nfs_server_list_fops); 1895 if (!p) 1896 goto error_1; 1897 1898 /* a file of volumes that we have mounted */ 1899 p = proc_create("volumes", S_IFREG|S_IRUGO, 1900 proc_fs_nfs, &nfs_volume_list_fops); 1901 if (!p) 1902 goto error_2; 1903 return 0; 1904 1905 error_2: 1906 remove_proc_entry("servers", proc_fs_nfs); 1907 error_1: 1908 remove_proc_entry("fs/nfsfs", NULL); 1909 error_0: 1910 return -ENOMEM; 1911 } 1912 1913 /* 1914 * clean up the /proc/fs/nfsfs/ directory 1915 */ 1916 void nfs_fs_proc_exit(void) 1917 { 1918 remove_proc_entry("volumes", proc_fs_nfs); 1919 remove_proc_entry("servers", proc_fs_nfs); 1920 remove_proc_entry("fs/nfsfs", NULL); 1921 } 1922 1923 #endif /* CONFIG_PROC_FS */ 1924