1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 */ 6#include <linux/module.h> 7#include <linux/nfs_fs.h> 8#include <linux/nfs_mount.h> 9#include <linux/sunrpc/addr.h> 10#include <linux/sunrpc/auth.h> 11#include <linux/sunrpc/xprt.h> 12#include <linux/sunrpc/bc_xprt.h> 13#include <linux/sunrpc/rpc_pipe_fs.h> 14#include "internal.h" 15#include "callback.h" 16#include "delegation.h" 17#include "nfs4session.h" 18#include "nfs4idmap.h" 19#include "pnfs.h" 20#include "netns.h" 21#include "sysfs.h" 22 23#define NFSDBG_FACILITY NFSDBG_CLIENT 24 25/* 26 * Get a unique NFSv4.0 callback identifier which will be used 27 * by the V4.0 callback service to lookup the nfs_client struct 28 */ 29static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 30{ 31 int ret = 0; 32 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 33 34 if (clp->rpc_ops->version != 4 || minorversion != 0) 35 return ret; 36 idr_preload(GFP_KERNEL); 37 spin_lock(&nn->nfs_client_lock); 38 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT); 39 if (ret >= 0) 40 clp->cl_cb_ident = ret; 41 spin_unlock(&nn->nfs_client_lock); 42 idr_preload_end(); 43 return ret < 0 ? ret : 0; 44} 45 46#ifdef CONFIG_NFS_V4_1 47/* 48 * Per auth flavor data server rpc clients 49 */ 50struct nfs4_ds_server { 51 struct list_head list; /* ds_clp->cl_ds_clients */ 52 struct rpc_clnt *rpc_clnt; 53}; 54 55/** 56 * nfs4_find_ds_client - Common lookup case for DS I/O 57 * @ds_clp: pointer to the DS's nfs_client 58 * @flavor: rpc auth flavour to match 59 */ 60static struct nfs4_ds_server * 61nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 62{ 63 struct nfs4_ds_server *dss; 64 65 rcu_read_lock(); 66 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { 67 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 68 continue; 69 goto out; 70 } 71 dss = NULL; 72out: 73 rcu_read_unlock(); 74 return dss; 75} 76 77static struct nfs4_ds_server * 78nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, 79 struct nfs4_ds_server *new) 80{ 81 struct nfs4_ds_server *dss; 82 83 spin_lock(&ds_clp->cl_lock); 84 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { 85 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 86 continue; 87 goto out; 88 } 89 if (new) 90 list_add_rcu(&new->list, &ds_clp->cl_ds_clients); 91 dss = new; 92out: 93 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 94 return dss; 95} 96 97static struct nfs4_ds_server * 98nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 99{ 100 struct nfs4_ds_server *dss; 101 102 dss = kmalloc(sizeof(*dss), GFP_NOFS); 103 if (dss == NULL) 104 return ERR_PTR(-ENOMEM); 105 106 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); 107 if (IS_ERR(dss->rpc_clnt)) { 108 int err = PTR_ERR(dss->rpc_clnt); 109 kfree (dss); 110 return ERR_PTR(err); 111 } 112 INIT_LIST_HEAD(&dss->list); 113 114 return dss; 115} 116 117static void 118nfs4_free_ds_server(struct nfs4_ds_server *dss) 119{ 120 rpc_release_client(dss->rpc_clnt); 121 kfree(dss); 122} 123 124/** 125 * nfs4_find_or_create_ds_client - Find or create a DS rpc client 126 * @ds_clp: pointer to the DS's nfs_client 127 * @inode: pointer to the inode 128 * 129 * Find or create a DS rpc client with th MDS server rpc client auth flavor 130 * in the nfs_client cl_ds_clients list. 131 */ 132struct rpc_clnt * 133nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) 134{ 135 struct nfs4_ds_server *dss, *new; 136 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; 137 138 dss = nfs4_find_ds_client(ds_clp, flavor); 139 if (dss != NULL) 140 goto out; 141 new = nfs4_alloc_ds_server(ds_clp, flavor); 142 if (IS_ERR(new)) 143 return ERR_CAST(new); 144 dss = nfs4_add_ds_client(ds_clp, flavor, new); 145 if (dss != new) 146 nfs4_free_ds_server(new); 147out: 148 return dss->rpc_clnt; 149} 150EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 151 152static void 153nfs4_shutdown_ds_clients(struct nfs_client *clp) 154{ 155 struct nfs4_ds_server *dss; 156 157 while (!list_empty(&clp->cl_ds_clients)) { 158 dss = list_entry(clp->cl_ds_clients.next, 159 struct nfs4_ds_server, list); 160 list_del(&dss->list); 161 rpc_shutdown_client(dss->rpc_clnt); 162 kfree (dss); 163 } 164} 165 166static void 167nfs4_cleanup_callback(struct nfs_client *clp) 168{ 169 struct nfs4_copy_state *cp_state; 170 171 while (!list_empty(&clp->pending_cb_stateids)) { 172 cp_state = list_entry(clp->pending_cb_stateids.next, 173 struct nfs4_copy_state, copies); 174 list_del(&cp_state->copies); 175 kfree(cp_state); 176 } 177} 178 179void nfs41_shutdown_client(struct nfs_client *clp) 180{ 181 if (nfs4_has_session(clp)) { 182 nfs4_cleanup_callback(clp); 183 nfs4_shutdown_ds_clients(clp); 184 nfs4_destroy_session(clp->cl_session); 185 nfs4_destroy_clientid(clp); 186 } 187 188} 189#endif /* CONFIG_NFS_V4_1 */ 190 191void nfs40_shutdown_client(struct nfs_client *clp) 192{ 193 if (clp->cl_slot_tbl) { 194 nfs4_shutdown_slot_table(clp->cl_slot_tbl); 195 kfree(clp->cl_slot_tbl); 196 } 197} 198 199struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 200{ 201 char buf[INET6_ADDRSTRLEN + 1]; 202 const char *ip_addr = cl_init->ip_addr; 203 struct nfs_client *clp = nfs_alloc_client(cl_init); 204 int err; 205 206 if (IS_ERR(clp)) 207 return clp; 208 209 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 210 if (err) 211 goto error; 212 213 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { 214 err = -EINVAL; 215 goto error; 216 } 217 218 spin_lock_init(&clp->cl_lock); 219 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 220 INIT_LIST_HEAD(&clp->cl_ds_clients); 221 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 222 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 223 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 224 clp->cl_mig_gen = 1; 225#if IS_ENABLED(CONFIG_NFS_V4_1) 226 init_waitqueue_head(&clp->cl_lock_waitq); 227#endif 228 INIT_LIST_HEAD(&clp->pending_cb_stateids); 229 230 if (cl_init->minorversion != 0) 231 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 232 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 233 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 234 235 if (test_bit(NFS_CS_DS, &cl_init->init_flags)) 236 __set_bit(NFS_CS_DS, &clp->cl_flags); 237 /* 238 * Set up the connection to the server before we add add to the 239 * global list. 240 */ 241 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 242 if (err == -EINVAL) 243 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 244 if (err < 0) 245 goto error; 246 247 /* If no clientaddr= option was specified, find a usable cb address */ 248 if (ip_addr == NULL) { 249 struct sockaddr_storage cb_addr; 250 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 251 252 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 253 if (err < 0) 254 goto error; 255 err = rpc_ntop(sap, buf, sizeof(buf)); 256 if (err < 0) 257 goto error; 258 ip_addr = (const char *)buf; 259 } 260 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 261 262 err = nfs_idmap_new(clp); 263 if (err < 0) { 264 dprintk("%s: failed to create idmapper. Error = %d\n", 265 __func__, err); 266 goto error; 267 } 268 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 269 return clp; 270 271error: 272 nfs_free_client(clp); 273 return ERR_PTR(err); 274} 275 276/* 277 * Destroy the NFS4 callback service 278 */ 279static void nfs4_destroy_callback(struct nfs_client *clp) 280{ 281 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 282 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 283} 284 285static void nfs4_shutdown_client(struct nfs_client *clp) 286{ 287 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 288 nfs4_kill_renewd(clp); 289 clp->cl_mvops->shutdown_client(clp); 290 nfs4_destroy_callback(clp); 291 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 292 nfs_idmap_delete(clp); 293 294 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 295 kfree(clp->cl_serverowner); 296 kfree(clp->cl_serverscope); 297 kfree(clp->cl_implid); 298 kfree(clp->cl_owner_id); 299} 300 301void nfs4_free_client(struct nfs_client *clp) 302{ 303 nfs4_shutdown_client(clp); 304 nfs_free_client(clp); 305} 306 307/* 308 * Initialize the NFS4 callback service 309 */ 310static int nfs4_init_callback(struct nfs_client *clp) 311{ 312 struct rpc_xprt *xprt; 313 int error; 314 315 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 316 317 if (nfs4_has_session(clp)) { 318 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 319 if (error < 0) 320 return error; 321 } 322 323 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 324 if (error < 0) { 325 dprintk("%s: failed to start callback. Error = %d\n", 326 __func__, error); 327 return error; 328 } 329 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 330 331 return 0; 332} 333 334/** 335 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 336 * @clp: nfs_client to initialize 337 * 338 * Returns zero on success, or a negative errno if some error occurred. 339 */ 340int nfs40_init_client(struct nfs_client *clp) 341{ 342 struct nfs4_slot_table *tbl; 343 int ret; 344 345 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 346 if (tbl == NULL) 347 return -ENOMEM; 348 349 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 350 "NFSv4.0 transport Slot table"); 351 if (ret) { 352 nfs4_shutdown_slot_table(tbl); 353 kfree(tbl); 354 return ret; 355 } 356 357 clp->cl_slot_tbl = tbl; 358 return 0; 359} 360 361#if defined(CONFIG_NFS_V4_1) 362 363/** 364 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 365 * @clp: nfs_client to initialize 366 * 367 * Returns zero on success, or a negative errno if some error occurred. 368 */ 369int nfs41_init_client(struct nfs_client *clp) 370{ 371 struct nfs4_session *session = NULL; 372 373 /* 374 * Create the session and mark it expired. 375 * When a SEQUENCE operation encounters the expired session 376 * it will do session recovery to initialize it. 377 */ 378 session = nfs4_alloc_session(clp); 379 if (!session) 380 return -ENOMEM; 381 382 clp->cl_session = session; 383 384 /* 385 * The create session reply races with the server back 386 * channel probe. Mark the client NFS_CS_SESSION_INITING 387 * so that the client back channel can find the 388 * nfs_client struct 389 */ 390 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 391 return 0; 392} 393 394#endif /* CONFIG_NFS_V4_1 */ 395 396/* 397 * Initialize the minor version specific parts of an NFS4 client record 398 */ 399static int nfs4_init_client_minor_version(struct nfs_client *clp) 400{ 401 int ret; 402 403 ret = clp->cl_mvops->init_client(clp); 404 if (ret) 405 return ret; 406 return nfs4_init_callback(clp); 407} 408 409static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old) 410{ 411 struct sockaddr_storage clp_addr, old_addr; 412 struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr; 413 struct sockaddr *old_sap = (struct sockaddr *)&old_addr; 414 size_t clp_salen; 415 struct xprt_create xprt_args = { 416 .ident = old->cl_proto, 417 .net = old->cl_net, 418 .servername = old->cl_hostname, 419 }; 420 int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ? 421 clp->cl_max_connect : old->cl_max_connect; 422 423 if (clp->cl_proto != old->cl_proto) 424 return; 425 clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr)); 426 rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr)); 427 428 if (clp_addr.ss_family != old_addr.ss_family) 429 return; 430 431 xprt_args.dstaddr = clp_sap; 432 xprt_args.addrlen = clp_salen; 433 434 rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args, 435 rpc_clnt_test_and_add_xprt, &max_connect); 436} 437 438/** 439 * nfs4_init_client - Initialise an NFS4 client record 440 * 441 * @clp: nfs_client to initialise 442 * @cl_init: pointer to nfs_client_initdata 443 * 444 * Returns pointer to an NFS client, or an ERR_PTR value. 445 */ 446struct nfs_client *nfs4_init_client(struct nfs_client *clp, 447 const struct nfs_client_initdata *cl_init) 448{ 449 struct nfs_client *old; 450 int error; 451 452 if (clp->cl_cons_state == NFS_CS_READY) 453 /* the client is initialised already */ 454 return clp; 455 456 error = nfs4_init_client_minor_version(clp); 457 if (error < 0) 458 goto error; 459 460 error = nfs4_discover_server_trunking(clp, &old); 461 if (error < 0) 462 goto error; 463 464 if (clp != old) { 465 clp->cl_preserve_clid = true; 466 /* 467 * Mark the client as having failed initialization so other 468 * processes walking the nfs_client_list in nfs_match_client() 469 * won't try to use it. 470 */ 471 nfs_mark_client_ready(clp, -EPERM); 472 if (old->cl_mvops->session_trunk) 473 nfs4_add_trunk(clp, old); 474 } 475 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 476 nfs_put_client(clp); 477 return old; 478 479error: 480 nfs_mark_client_ready(clp, error); 481 nfs_put_client(clp); 482 return ERR_PTR(error); 483} 484 485/* 486 * SETCLIENTID just did a callback update with the callback ident in 487 * "drop," but server trunking discovery claims "drop" and "keep" are 488 * actually the same server. Swap the callback IDs so that "keep" 489 * will continue to use the callback ident the server now knows about, 490 * and so that "keep"'s original callback ident is destroyed when 491 * "drop" is freed. 492 */ 493static void nfs4_swap_callback_idents(struct nfs_client *keep, 494 struct nfs_client *drop) 495{ 496 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 497 unsigned int save = keep->cl_cb_ident; 498 499 if (keep->cl_cb_ident == drop->cl_cb_ident) 500 return; 501 502 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 503 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 504 505 spin_lock(&nn->nfs_client_lock); 506 507 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 508 keep->cl_cb_ident = drop->cl_cb_ident; 509 510 idr_replace(&nn->cb_ident_idr, drop, save); 511 drop->cl_cb_ident = save; 512 513 spin_unlock(&nn->nfs_client_lock); 514} 515 516static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 517 const struct nfs_client *clp2) 518{ 519 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 520 return true; 521 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 522} 523 524static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 525{ 526 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 527} 528 529static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 530 struct nfs_client **prev, struct nfs_net *nn) 531{ 532 int status; 533 534 if (pos->rpc_ops != new->rpc_ops) 535 return 1; 536 537 if (pos->cl_minorversion != new->cl_minorversion) 538 return 1; 539 540 /* If "pos" isn't marked ready, we can't trust the 541 * remaining fields in "pos", especially the client 542 * ID and serverowner fields. Wait for CREATE_SESSION 543 * to finish. */ 544 if (pos->cl_cons_state > NFS_CS_READY) { 545 refcount_inc(&pos->cl_count); 546 spin_unlock(&nn->nfs_client_lock); 547 548 nfs_put_client(*prev); 549 *prev = pos; 550 551 status = nfs_wait_client_init_complete(pos); 552 spin_lock(&nn->nfs_client_lock); 553 554 if (status < 0) 555 return status; 556 } 557 558 if (pos->cl_cons_state != NFS_CS_READY) 559 return 1; 560 561 if (pos->cl_clientid != new->cl_clientid) 562 return 1; 563 564 /* NFSv4.1 always uses the uniform string, however someone 565 * might switch the uniquifier string on us. 566 */ 567 if (!nfs4_match_client_owner_id(pos, new)) 568 return 1; 569 570 return 0; 571} 572 573/** 574 * nfs40_walk_client_list - Find server that recognizes a client ID 575 * 576 * @new: nfs_client with client ID to test 577 * @result: OUT: found nfs_client, or new 578 * @cred: credential to use for trunking test 579 * 580 * Returns zero, a negative errno, or a negative NFS4ERR status. 581 * If zero is returned, an nfs_client pointer is planted in "result." 582 * 583 * NB: nfs40_walk_client_list() relies on the new nfs_client being 584 * the last nfs_client on the list. 585 */ 586int nfs40_walk_client_list(struct nfs_client *new, 587 struct nfs_client **result, 588 const struct cred *cred) 589{ 590 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 591 struct nfs_client *pos, *prev = NULL; 592 struct nfs4_setclientid_res clid = { 593 .clientid = new->cl_clientid, 594 .confirm = new->cl_confirm, 595 }; 596 int status = -NFS4ERR_STALE_CLIENTID; 597 598 spin_lock(&nn->nfs_client_lock); 599 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 600 601 if (pos == new) 602 goto found; 603 604 status = nfs4_match_client(pos, new, &prev, nn); 605 if (status < 0) 606 goto out_unlock; 607 if (status != 0) 608 continue; 609 /* 610 * We just sent a new SETCLIENTID, which should have 611 * caused the server to return a new cl_confirm. So if 612 * cl_confirm is the same, then this is a different 613 * server that just returned the same cl_confirm by 614 * coincidence: 615 */ 616 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 617 &new->cl_confirm)) 618 continue; 619 /* 620 * But if the cl_confirm's are different, then the only 621 * way that a SETCLIENTID_CONFIRM to pos can succeed is 622 * if new and pos point to the same server: 623 */ 624found: 625 refcount_inc(&pos->cl_count); 626 spin_unlock(&nn->nfs_client_lock); 627 628 nfs_put_client(prev); 629 prev = pos; 630 631 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 632 switch (status) { 633 case -NFS4ERR_STALE_CLIENTID: 634 break; 635 case 0: 636 nfs4_swap_callback_idents(pos, new); 637 pos->cl_confirm = new->cl_confirm; 638 nfs_mark_client_ready(pos, NFS_CS_READY); 639 640 prev = NULL; 641 *result = pos; 642 goto out; 643 case -ERESTARTSYS: 644 case -ETIMEDOUT: 645 /* The callback path may have been inadvertently 646 * changed. Schedule recovery! 647 */ 648 nfs4_schedule_path_down_recovery(pos); 649 goto out; 650 default: 651 goto out; 652 } 653 654 spin_lock(&nn->nfs_client_lock); 655 } 656out_unlock: 657 spin_unlock(&nn->nfs_client_lock); 658 659 /* No match found. The server lost our clientid */ 660out: 661 nfs_put_client(prev); 662 return status; 663} 664 665#ifdef CONFIG_NFS_V4_1 666/* 667 * Returns true if the server major ids match 668 */ 669bool 670nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 671 struct nfs41_server_owner *o2) 672{ 673 if (o1->major_id_sz != o2->major_id_sz) 674 return false; 675 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 676} 677 678/* 679 * Returns true if the server scopes match 680 */ 681static bool 682nfs4_check_server_scope(struct nfs41_server_scope *s1, 683 struct nfs41_server_scope *s2) 684{ 685 if (s1->server_scope_sz != s2->server_scope_sz) 686 return false; 687 return memcmp(s1->server_scope, s2->server_scope, 688 s1->server_scope_sz) == 0; 689} 690 691/** 692 * nfs4_detect_session_trunking - Checks for session trunking. 693 * @clp: original mount nfs_client 694 * @res: result structure from an exchange_id using the original mount 695 * nfs_client with a new multi_addr transport 696 * @xprt: pointer to the transport to add. 697 * 698 * Called after a successful EXCHANGE_ID on a multi-addr connection. 699 * Upon success, add the transport. 700 * 701 * Returns zero on success, otherwise -EINVAL 702 * 703 * Note: since the exchange_id for the new multi_addr transport uses the 704 * same nfs_client from the original mount, the cl_owner_id is reused, 705 * so eir_clientowner is the same. 706 */ 707int nfs4_detect_session_trunking(struct nfs_client *clp, 708 struct nfs41_exchange_id_res *res, 709 struct rpc_xprt *xprt) 710{ 711 /* Check eir_clientid */ 712 if (clp->cl_clientid != res->clientid) 713 goto out_err; 714 715 /* Check eir_server_owner so_major_id */ 716 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 717 res->server_owner)) 718 goto out_err; 719 720 /* Check eir_server_owner so_minor_id */ 721 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 722 goto out_err; 723 724 /* Check eir_server_scope */ 725 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 726 goto out_err; 727 728 pr_info("NFS: %s: Session trunking succeeded for %s\n", 729 clp->cl_hostname, 730 xprt->address_strings[RPC_DISPLAY_ADDR]); 731 732 return 0; 733out_err: 734 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 735 xprt->address_strings[RPC_DISPLAY_ADDR]); 736 737 return -EINVAL; 738} 739 740/** 741 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 742 * 743 * @new: nfs_client with client ID to test 744 * @result: OUT: found nfs_client, or new 745 * @cred: credential to use for trunking test 746 * 747 * Returns zero, a negative errno, or a negative NFS4ERR status. 748 * If zero is returned, an nfs_client pointer is planted in "result." 749 * 750 * NB: nfs41_walk_client_list() relies on the new nfs_client being 751 * the last nfs_client on the list. 752 */ 753int nfs41_walk_client_list(struct nfs_client *new, 754 struct nfs_client **result, 755 const struct cred *cred) 756{ 757 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 758 struct nfs_client *pos, *prev = NULL; 759 int status = -NFS4ERR_STALE_CLIENTID; 760 761 spin_lock(&nn->nfs_client_lock); 762 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 763 764 if (pos == new) 765 goto found; 766 767 status = nfs4_match_client(pos, new, &prev, nn); 768 if (status < 0) 769 goto out; 770 if (status != 0) 771 continue; 772 773 /* 774 * Note that session trunking is just a special subcase of 775 * client id trunking. In either case, we want to fall back 776 * to using the existing nfs_client. 777 */ 778 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 779 new->cl_serverowner)) 780 continue; 781 782found: 783 refcount_inc(&pos->cl_count); 784 *result = pos; 785 status = 0; 786 break; 787 } 788 789out: 790 spin_unlock(&nn->nfs_client_lock); 791 nfs_put_client(prev); 792 return status; 793} 794#endif /* CONFIG_NFS_V4_1 */ 795 796static void nfs4_destroy_server(struct nfs_server *server) 797{ 798 LIST_HEAD(freeme); 799 800 nfs_server_return_all_delegations(server); 801 unset_pnfs_layoutdriver(server); 802 nfs4_purge_state_owners(server, &freeme); 803 nfs4_free_state_owners(&freeme); 804} 805 806/* 807 * NFSv4.0 callback thread helper 808 * 809 * Find a client by callback identifier 810 */ 811struct nfs_client * 812nfs4_find_client_ident(struct net *net, int cb_ident) 813{ 814 struct nfs_client *clp; 815 struct nfs_net *nn = net_generic(net, nfs_net_id); 816 817 spin_lock(&nn->nfs_client_lock); 818 clp = idr_find(&nn->cb_ident_idr, cb_ident); 819 if (clp) 820 refcount_inc(&clp->cl_count); 821 spin_unlock(&nn->nfs_client_lock); 822 return clp; 823} 824 825#if defined(CONFIG_NFS_V4_1) 826/* Common match routine for v4.0 and v4.1 callback services */ 827static bool nfs4_cb_match_client(const struct sockaddr *addr, 828 struct nfs_client *clp, u32 minorversion) 829{ 830 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 831 832 /* Don't match clients that failed to initialise */ 833 if (!(clp->cl_cons_state == NFS_CS_READY || 834 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 835 return false; 836 837 smp_rmb(); 838 839 /* Match the version and minorversion */ 840 if (clp->rpc_ops->version != 4 || 841 clp->cl_minorversion != minorversion) 842 return false; 843 844 /* Match only the IP address, not the port number */ 845 return rpc_cmp_addr(addr, clap); 846} 847 848/* 849 * NFSv4.1 callback thread helper 850 * For CB_COMPOUND calls, find a client by IP address, protocol version, 851 * minorversion, and sessionID 852 * 853 * Returns NULL if no such client 854 */ 855struct nfs_client * 856nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 857 struct nfs4_sessionid *sid, u32 minorversion) 858{ 859 struct nfs_client *clp; 860 struct nfs_net *nn = net_generic(net, nfs_net_id); 861 862 spin_lock(&nn->nfs_client_lock); 863 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 864 if (!nfs4_cb_match_client(addr, clp, minorversion)) 865 continue; 866 867 if (!nfs4_has_session(clp)) 868 continue; 869 870 /* Match sessionid*/ 871 if (memcmp(clp->cl_session->sess_id.data, 872 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 873 continue; 874 875 refcount_inc(&clp->cl_count); 876 spin_unlock(&nn->nfs_client_lock); 877 return clp; 878 } 879 spin_unlock(&nn->nfs_client_lock); 880 return NULL; 881} 882 883#else /* CONFIG_NFS_V4_1 */ 884 885struct nfs_client * 886nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 887 struct nfs4_sessionid *sid, u32 minorversion) 888{ 889 return NULL; 890} 891#endif /* CONFIG_NFS_V4_1 */ 892 893/* 894 * Set up an NFS4 client 895 */ 896static int nfs4_set_client(struct nfs_server *server, 897 const char *hostname, 898 const struct sockaddr_storage *addr, 899 const size_t addrlen, 900 const char *ip_addr, 901 int proto, const struct rpc_timeout *timeparms, 902 u32 minorversion, unsigned int nconnect, 903 unsigned int max_connect, 904 struct net *net, 905 struct xprtsec_parms *xprtsec) 906{ 907 struct nfs_client_initdata cl_init = { 908 .hostname = hostname, 909 .addr = addr, 910 .addrlen = addrlen, 911 .ip_addr = ip_addr, 912 .nfs_mod = &nfs_v4, 913 .proto = proto, 914 .minorversion = minorversion, 915 .net = net, 916 .timeparms = timeparms, 917 .cred = server->cred, 918 .xprtsec = *xprtsec, 919 }; 920 struct nfs_client *clp; 921 922 if (minorversion == 0) 923 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags); 924 else 925 cl_init.max_connect = max_connect; 926 switch (proto) { 927 case XPRT_TRANSPORT_RDMA: 928 case XPRT_TRANSPORT_TCP: 929 case XPRT_TRANSPORT_TCP_TLS: 930 cl_init.nconnect = nconnect; 931 } 932 933 if (server->flags & NFS_MOUNT_NORESVPORT) 934 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 935 if (server->options & NFS_OPTION_MIGRATION) 936 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 937 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 938 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags); 939 server->port = rpc_get_port((struct sockaddr *)addr); 940 941 /* Allocate or find a client reference we can use */ 942 clp = nfs_get_client(&cl_init); 943 if (IS_ERR(clp)) 944 return PTR_ERR(clp); 945 946 if (server->nfs_client == clp) { 947 nfs_put_client(clp); 948 return -ELOOP; 949 } 950 951 /* 952 * Query for the lease time on clientid setup or renewal 953 * 954 * Note that this will be set on nfs_clients that were created 955 * only for the DS role and did not set this bit, but now will 956 * serve a dual role. 957 */ 958 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 959 960 server->nfs_client = clp; 961 nfs_sysfs_add_server(server); 962 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 963 964 return 0; 965} 966 967/* 968 * Set up a pNFS Data Server client. 969 * 970 * Return any existing nfs_client that matches server address,port,version 971 * and minorversion. 972 * 973 * For a new nfs_client, use a soft mount (default), a low retrans and a 974 * low timeout interval so that if a connection is lost, we retry through 975 * the MDS. 976 */ 977struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 978 const struct sockaddr_storage *ds_addr, int ds_addrlen, 979 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 980 u32 minor_version) 981{ 982 struct rpc_timeout ds_timeout; 983 struct nfs_client *mds_clp = mds_srv->nfs_client; 984 struct nfs_client_initdata cl_init = { 985 .addr = ds_addr, 986 .addrlen = ds_addrlen, 987 .nodename = mds_clp->cl_rpcclient->cl_nodename, 988 .ip_addr = mds_clp->cl_ipaddr, 989 .nfs_mod = &nfs_v4, 990 .proto = ds_proto, 991 .minorversion = minor_version, 992 .net = mds_clp->cl_net, 993 .timeparms = &ds_timeout, 994 .cred = mds_srv->cred, 995 .xprtsec = mds_srv->nfs_client->cl_xprtsec, 996 }; 997 char buf[INET6_ADDRSTRLEN + 1]; 998 999 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0) 1000 return ERR_PTR(-EINVAL); 1001 cl_init.hostname = buf; 1002 1003 switch (ds_proto) { 1004 case XPRT_TRANSPORT_RDMA: 1005 case XPRT_TRANSPORT_TCP: 1006 case XPRT_TRANSPORT_TCP_TLS: 1007 if (mds_clp->cl_nconnect > 1) { 1008 cl_init.nconnect = mds_clp->cl_nconnect; 1009 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1010 } 1011 } 1012 1013 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 1014 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 1015 1016 __set_bit(NFS_CS_DS, &cl_init.init_flags); 1017 __set_bit(NFS_CS_PNFS, &cl_init.init_flags); 1018 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1019 /* 1020 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1021 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1022 * (section 13.1 RFC 5661). 1023 */ 1024 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 1025 return nfs_get_client(&cl_init); 1026} 1027EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1028 1029/* 1030 * Session has been established, and the client marked ready. 1031 * Limit the mount rsize, wsize and dtsize using negotiated fore 1032 * channel attributes. 1033 */ 1034static void nfs4_session_limit_rwsize(struct nfs_server *server) 1035{ 1036#ifdef CONFIG_NFS_V4_1 1037 struct nfs4_session *sess; 1038 u32 server_resp_sz; 1039 u32 server_rqst_sz; 1040 1041 if (!nfs4_has_session(server->nfs_client)) 1042 return; 1043 sess = server->nfs_client->cl_session; 1044 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1045 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1046 1047 if (server->dtsize > server_resp_sz) 1048 server->dtsize = server_resp_sz; 1049 if (server->rsize > server_resp_sz) 1050 server->rsize = server_resp_sz; 1051 if (server->wsize > server_rqst_sz) 1052 server->wsize = server_rqst_sz; 1053#endif /* CONFIG_NFS_V4_1 */ 1054} 1055 1056/* 1057 * Limit xattr sizes using the channel attributes. 1058 */ 1059static void nfs4_session_limit_xasize(struct nfs_server *server) 1060{ 1061#ifdef CONFIG_NFS_V4_2 1062 struct nfs4_session *sess; 1063 u32 server_gxa_sz; 1064 u32 server_sxa_sz; 1065 u32 server_lxa_sz; 1066 1067 if (!nfs4_has_session(server->nfs_client)) 1068 return; 1069 1070 sess = server->nfs_client->cl_session; 1071 1072 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead; 1073 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead; 1074 server_lxa_sz = sess->fc_attrs.max_resp_sz - 1075 nfs42_maxlistxattrs_overhead; 1076 1077 if (server->gxasize > server_gxa_sz) 1078 server->gxasize = server_gxa_sz; 1079 if (server->sxasize > server_sxa_sz) 1080 server->sxasize = server_sxa_sz; 1081 if (server->lxasize > server_lxa_sz) 1082 server->lxasize = server_lxa_sz; 1083#endif 1084} 1085 1086void nfs4_server_set_init_caps(struct nfs_server *server) 1087{ 1088 /* Set the basic capabilities */ 1089 server->caps |= server->nfs_client->cl_mvops->init_caps; 1090 if (server->flags & NFS_MOUNT_NORDIRPLUS) 1091 server->caps &= ~NFS_CAP_READDIRPLUS; 1092 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA) 1093 server->caps &= ~NFS_CAP_READ_PLUS; 1094 1095 /* 1096 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1097 * authentication. 1098 */ 1099 if (nfs4_disable_idmapping && 1100 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 1101 server->caps |= NFS_CAP_UIDGID_NOMAP; 1102} 1103 1104static int nfs4_server_common_setup(struct nfs_server *server, 1105 struct nfs_fh *mntfh, bool auth_probe) 1106{ 1107 int error; 1108 1109 /* data servers support only a subset of NFSv4.1 */ 1110 if (is_ds_only_client(server->nfs_client)) 1111 return -EPROTONOSUPPORT; 1112 1113 /* We must ensure the session is initialised first */ 1114 error = nfs4_init_session(server->nfs_client); 1115 if (error < 0) 1116 goto out; 1117 1118 nfs4_server_set_init_caps(server); 1119 1120 /* Probe the root fh to retrieve its FSID and filehandle */ 1121 error = nfs4_get_rootfh(server, mntfh, auth_probe); 1122 if (error < 0) 1123 goto out; 1124 1125 dprintk("Server FSID: %llx:%llx\n", 1126 (unsigned long long) server->fsid.major, 1127 (unsigned long long) server->fsid.minor); 1128 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1129 1130 error = nfs_probe_server(server, mntfh); 1131 if (error < 0) 1132 goto out; 1133 1134 nfs4_session_limit_rwsize(server); 1135 nfs4_session_limit_xasize(server); 1136 1137 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1138 server->namelen = NFS4_MAXNAMLEN; 1139 1140 nfs_server_insert_lists(server); 1141 server->mount_time = jiffies; 1142 server->destroy = nfs4_destroy_server; 1143out: 1144 return error; 1145} 1146 1147/* 1148 * Create a version 4 volume record 1149 */ 1150static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc) 1151{ 1152 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1153 struct rpc_timeout timeparms; 1154 int error; 1155 1156 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 1157 ctx->timeo, ctx->retrans); 1158 1159 /* Initialise the client representation from the mount data */ 1160 server->flags = ctx->flags; 1161 server->options = ctx->options; 1162 server->auth_info = ctx->auth_info; 1163 1164 /* Use the first specified auth flavor. If this flavor isn't 1165 * allowed by the server, use the SECINFO path to try the 1166 * other specified flavors */ 1167 if (ctx->auth_info.flavor_len >= 1) 1168 ctx->selected_flavor = ctx->auth_info.flavors[0]; 1169 else 1170 ctx->selected_flavor = RPC_AUTH_UNIX; 1171 1172 /* Get a client record */ 1173 error = nfs4_set_client(server, 1174 ctx->nfs_server.hostname, 1175 &ctx->nfs_server._address, 1176 ctx->nfs_server.addrlen, 1177 ctx->client_address, 1178 ctx->nfs_server.protocol, 1179 &timeparms, 1180 ctx->minorversion, 1181 ctx->nfs_server.nconnect, 1182 ctx->nfs_server.max_connect, 1183 fc->net_ns, 1184 &ctx->xprtsec); 1185 if (error < 0) 1186 return error; 1187 1188 if (ctx->rsize) 1189 server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto); 1190 if (ctx->wsize) 1191 server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto); 1192 1193 server->acregmin = ctx->acregmin * HZ; 1194 server->acregmax = ctx->acregmax * HZ; 1195 server->acdirmin = ctx->acdirmin * HZ; 1196 server->acdirmax = ctx->acdirmax * HZ; 1197 server->port = ctx->nfs_server.port; 1198 1199 return nfs_init_server_rpcclient(server, &timeparms, 1200 ctx->selected_flavor); 1201} 1202 1203/* 1204 * Create a version 4 volume record 1205 * - keyed on server and FSID 1206 */ 1207struct nfs_server *nfs4_create_server(struct fs_context *fc) 1208{ 1209 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1210 struct nfs_server *server; 1211 bool auth_probe; 1212 int error; 1213 1214 server = nfs_alloc_server(); 1215 if (!server) 1216 return ERR_PTR(-ENOMEM); 1217 1218 server->cred = get_cred(fc->cred); 1219 1220 auth_probe = ctx->auth_info.flavor_len < 1; 1221 1222 /* set up the general RPC client */ 1223 error = nfs4_init_server(server, fc); 1224 if (error < 0) 1225 goto error; 1226 1227 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1228 if (error < 0) 1229 goto error; 1230 1231 return server; 1232 1233error: 1234 nfs_free_server(server); 1235 return ERR_PTR(error); 1236} 1237 1238/* 1239 * Create an NFS4 referral server record 1240 */ 1241struct nfs_server *nfs4_create_referral_server(struct fs_context *fc) 1242{ 1243 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1244 struct nfs_client *parent_client; 1245 struct nfs_server *server, *parent_server; 1246 int proto, error; 1247 bool auth_probe; 1248 1249 server = nfs_alloc_server(); 1250 if (!server) 1251 return ERR_PTR(-ENOMEM); 1252 1253 parent_server = NFS_SB(ctx->clone_data.sb); 1254 parent_client = parent_server->nfs_client; 1255 1256 server->cred = get_cred(parent_server->cred); 1257 1258 /* Initialise the client representation from the parent server */ 1259 nfs_server_copy_userdata(server, parent_server); 1260 1261 /* Get a client representation */ 1262#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1263 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT); 1264 error = nfs4_set_client(server, 1265 ctx->nfs_server.hostname, 1266 &ctx->nfs_server._address, 1267 ctx->nfs_server.addrlen, 1268 parent_client->cl_ipaddr, 1269 XPRT_TRANSPORT_RDMA, 1270 parent_server->client->cl_timeout, 1271 parent_client->cl_mvops->minor_version, 1272 parent_client->cl_nconnect, 1273 parent_client->cl_max_connect, 1274 parent_client->cl_net, 1275 &parent_client->cl_xprtsec); 1276 if (!error) 1277 goto init_server; 1278#endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ 1279 1280 proto = XPRT_TRANSPORT_TCP; 1281 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) 1282 proto = XPRT_TRANSPORT_TCP_TLS; 1283 rpc_set_port(&ctx->nfs_server.address, NFS_PORT); 1284 error = nfs4_set_client(server, 1285 ctx->nfs_server.hostname, 1286 &ctx->nfs_server._address, 1287 ctx->nfs_server.addrlen, 1288 parent_client->cl_ipaddr, 1289 proto, 1290 parent_server->client->cl_timeout, 1291 parent_client->cl_mvops->minor_version, 1292 parent_client->cl_nconnect, 1293 parent_client->cl_max_connect, 1294 parent_client->cl_net, 1295 &parent_client->cl_xprtsec); 1296 if (error < 0) 1297 goto error; 1298 1299#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1300init_server: 1301#endif 1302 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, 1303 ctx->selected_flavor); 1304 if (error < 0) 1305 goto error; 1306 1307 auth_probe = parent_server->auth_info.flavor_len < 1; 1308 1309 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1310 if (error < 0) 1311 goto error; 1312 1313 return server; 1314 1315error: 1316 nfs_free_server(server); 1317 return ERR_PTR(error); 1318} 1319 1320/** 1321 * nfs4_update_server - Move an nfs_server to a different nfs_client 1322 * 1323 * @server: represents FSID to be moved 1324 * @hostname: new end-point's hostname 1325 * @sap: new end-point's socket address 1326 * @salen: size of "sap" 1327 * @net: net namespace 1328 * 1329 * The nfs_server must be quiescent before this function is invoked. 1330 * Either its session is drained (NFSv4.1+), or its transport is 1331 * plugged and drained (NFSv4.0). 1332 * 1333 * Returns zero on success, or a negative errno value. 1334 */ 1335int nfs4_update_server(struct nfs_server *server, const char *hostname, 1336 struct sockaddr_storage *sap, size_t salen, struct net *net) 1337{ 1338 struct nfs_client *clp = server->nfs_client; 1339 struct rpc_clnt *clnt = server->client; 1340 struct xprt_create xargs = { 1341 .ident = clp->cl_proto, 1342 .net = net, 1343 .dstaddr = (struct sockaddr *)sap, 1344 .addrlen = salen, 1345 .servername = hostname, 1346 /* cel: bleh. We might need to pass TLS parameters here */ 1347 }; 1348 char buf[INET6_ADDRSTRLEN + 1]; 1349 struct sockaddr_storage address; 1350 struct sockaddr *localaddr = (struct sockaddr *)&address; 1351 int error; 1352 1353 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1354 if (error != 0) 1355 return error; 1356 1357 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1358 if (error != 0) 1359 return error; 1360 1361 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1362 return -EAFNOSUPPORT; 1363 1364 nfs_server_remove_lists(server); 1365 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1366 error = nfs4_set_client(server, hostname, sap, salen, buf, 1367 clp->cl_proto, clnt->cl_timeout, 1368 clp->cl_minorversion, 1369 clp->cl_nconnect, clp->cl_max_connect, 1370 net, &clp->cl_xprtsec); 1371 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1372 if (error != 0) { 1373 nfs_server_insert_lists(server); 1374 return error; 1375 } 1376 nfs_put_client(clp); 1377 1378 if (server->nfs_client->cl_hostname == NULL) { 1379 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1380 if (server->nfs_client->cl_hostname == NULL) 1381 return -ENOMEM; 1382 } 1383 nfs_server_insert_lists(server); 1384 1385 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root))); 1386} 1387