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 */ 29 static 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 */ 50 struct 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 */ 60 static struct nfs4_ds_server * 61 nfs4_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; 72 out: 73 rcu_read_unlock(); 74 return dss; 75 } 76 77 static struct nfs4_ds_server * 78 nfs4_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; 92 out: 93 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 94 return dss; 95 } 96 97 static struct nfs4_ds_server * 98 nfs4_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 } 116 117 static void 118 nfs4_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 */ 132 struct rpc_clnt * 133 nfs4_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); 147 out: 148 return dss->rpc_clnt; 149 } 150 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 151 152 static void 153 nfs4_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 } 165 166 static void 167 nfs4_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 } 178 179 void 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 */ 190 191 void 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 } 198 199 struct 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 if (test_bit(NFS_CS_PNFS, &cl_init->init_flags)) 235 __set_bit(NFS_CS_PNFS, &clp->cl_flags); 236 /* 237 * Set up the connection to the server before we add add to the 238 * global list. 239 */ 240 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 241 if (err == -EINVAL) 242 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 243 if (err < 0) 244 goto error; 245 246 /* If no clientaddr= option was specified, find a usable cb address */ 247 if (ip_addr == NULL) { 248 struct sockaddr_storage cb_addr; 249 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 250 251 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 252 if (err < 0) 253 goto error; 254 err = rpc_ntop(sap, buf, sizeof(buf)); 255 if (err < 0) 256 goto error; 257 ip_addr = (const char *)buf; 258 } 259 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 260 261 err = nfs_idmap_new(clp); 262 if (err < 0) { 263 dprintk("%s: failed to create idmapper. Error = %d\n", 264 __func__, err); 265 goto error; 266 } 267 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 268 return clp; 269 270 error: 271 nfs_free_client(clp); 272 return ERR_PTR(err); 273 } 274 275 /* 276 * Destroy the NFS4 callback service 277 */ 278 static void nfs4_destroy_callback(struct nfs_client *clp) 279 { 280 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 281 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 282 } 283 284 static void nfs4_shutdown_client(struct nfs_client *clp) 285 { 286 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 287 nfs4_kill_renewd(clp); 288 clp->cl_mvops->shutdown_client(clp); 289 nfs4_destroy_callback(clp); 290 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 291 nfs_idmap_delete(clp); 292 293 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 294 kfree(clp->cl_serverowner); 295 kfree(clp->cl_serverscope); 296 kfree(clp->cl_implid); 297 kfree(clp->cl_owner_id); 298 } 299 300 void nfs4_free_client(struct nfs_client *clp) 301 { 302 nfs4_shutdown_client(clp); 303 nfs_free_client(clp); 304 } 305 306 /* 307 * Initialize the NFS4 callback service 308 */ 309 static int nfs4_init_callback(struct nfs_client *clp) 310 { 311 struct rpc_xprt *xprt; 312 int error; 313 314 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 315 316 if (nfs4_has_session(clp)) { 317 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 318 if (error < 0) 319 return error; 320 } 321 322 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 323 if (error < 0) { 324 dprintk("%s: failed to start callback. Error = %d\n", 325 __func__, error); 326 return error; 327 } 328 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 329 330 return 0; 331 } 332 333 /** 334 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 335 * @clp: nfs_client to initialize 336 * 337 * Returns zero on success, or a negative errno if some error occurred. 338 */ 339 int nfs40_init_client(struct nfs_client *clp) 340 { 341 struct nfs4_slot_table *tbl; 342 int ret; 343 344 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 345 if (tbl == NULL) 346 return -ENOMEM; 347 348 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 349 "NFSv4.0 transport Slot table"); 350 if (ret) { 351 nfs4_shutdown_slot_table(tbl); 352 kfree(tbl); 353 return ret; 354 } 355 356 clp->cl_slot_tbl = tbl; 357 return 0; 358 } 359 360 #if defined(CONFIG_NFS_V4_1) 361 362 /** 363 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 364 * @clp: nfs_client to initialize 365 * 366 * Returns zero on success, or a negative errno if some error occurred. 367 */ 368 int nfs41_init_client(struct nfs_client *clp) 369 { 370 struct nfs4_session *session = NULL; 371 372 /* 373 * Create the session and mark it expired. 374 * When a SEQUENCE operation encounters the expired session 375 * it will do session recovery to initialize it. 376 */ 377 session = nfs4_alloc_session(clp); 378 if (!session) 379 return -ENOMEM; 380 381 clp->cl_session = session; 382 383 /* 384 * The create session reply races with the server back 385 * channel probe. Mark the client NFS_CS_SESSION_INITING 386 * so that the client back channel can find the 387 * nfs_client struct 388 */ 389 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 390 return 0; 391 } 392 393 #endif /* CONFIG_NFS_V4_1 */ 394 395 /* 396 * Initialize the minor version specific parts of an NFS4 client record 397 */ 398 static int nfs4_init_client_minor_version(struct nfs_client *clp) 399 { 400 int ret; 401 402 ret = clp->cl_mvops->init_client(clp); 403 if (ret) 404 return ret; 405 return nfs4_init_callback(clp); 406 } 407 408 static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old) 409 { 410 struct sockaddr_storage clp_addr, old_addr; 411 struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr; 412 struct sockaddr *old_sap = (struct sockaddr *)&old_addr; 413 size_t clp_salen; 414 struct xprt_create xprt_args = { 415 .ident = old->cl_proto, 416 .net = old->cl_net, 417 .servername = old->cl_hostname, 418 }; 419 int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ? 420 clp->cl_max_connect : old->cl_max_connect; 421 422 if (clp->cl_proto != old->cl_proto) 423 return; 424 clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr)); 425 rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr)); 426 427 if (clp_addr.ss_family != old_addr.ss_family) 428 return; 429 430 xprt_args.dstaddr = clp_sap; 431 xprt_args.addrlen = clp_salen; 432 433 rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args, 434 rpc_clnt_test_and_add_xprt, &max_connect); 435 } 436 437 /** 438 * nfs4_init_client - Initialise an NFS4 client record 439 * 440 * @clp: nfs_client to initialise 441 * @cl_init: pointer to nfs_client_initdata 442 * 443 * Returns pointer to an NFS client, or an ERR_PTR value. 444 */ 445 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 446 const struct nfs_client_initdata *cl_init) 447 { 448 struct nfs_client *old; 449 int error; 450 451 if (clp->cl_cons_state == NFS_CS_READY) 452 /* the client is initialised already */ 453 return clp; 454 455 error = nfs4_init_client_minor_version(clp); 456 if (error < 0) 457 goto error; 458 459 error = nfs4_discover_server_trunking(clp, &old); 460 if (error < 0) 461 goto error; 462 463 if (clp != old) { 464 clp->cl_preserve_clid = true; 465 /* 466 * Mark the client as having failed initialization so other 467 * processes walking the nfs_client_list in nfs_match_client() 468 * won't try to use it. 469 */ 470 nfs_mark_client_ready(clp, -EPERM); 471 if (old->cl_mvops->session_trunk) 472 nfs4_add_trunk(clp, old); 473 } 474 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 475 nfs_put_client(clp); 476 return old; 477 478 error: 479 nfs_mark_client_ready(clp, error); 480 nfs_put_client(clp); 481 return ERR_PTR(error); 482 } 483 484 /* 485 * SETCLIENTID just did a callback update with the callback ident in 486 * "drop," but server trunking discovery claims "drop" and "keep" are 487 * actually the same server. Swap the callback IDs so that "keep" 488 * will continue to use the callback ident the server now knows about, 489 * and so that "keep"'s original callback ident is destroyed when 490 * "drop" is freed. 491 */ 492 static void nfs4_swap_callback_idents(struct nfs_client *keep, 493 struct nfs_client *drop) 494 { 495 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 496 unsigned int save = keep->cl_cb_ident; 497 498 if (keep->cl_cb_ident == drop->cl_cb_ident) 499 return; 500 501 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 502 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 503 504 spin_lock(&nn->nfs_client_lock); 505 506 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 507 keep->cl_cb_ident = drop->cl_cb_ident; 508 509 idr_replace(&nn->cb_ident_idr, drop, save); 510 drop->cl_cb_ident = save; 511 512 spin_unlock(&nn->nfs_client_lock); 513 } 514 515 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 516 const struct nfs_client *clp2) 517 { 518 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 519 return true; 520 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 521 } 522 523 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 524 { 525 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 526 } 527 528 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 529 struct nfs_client **prev, struct nfs_net *nn) 530 { 531 int status; 532 533 if (pos->rpc_ops != new->rpc_ops) 534 return 1; 535 536 if (pos->cl_minorversion != new->cl_minorversion) 537 return 1; 538 539 /* If "pos" isn't marked ready, we can't trust the 540 * remaining fields in "pos", especially the client 541 * ID and serverowner fields. Wait for CREATE_SESSION 542 * to finish. */ 543 if (pos->cl_cons_state > NFS_CS_READY) { 544 refcount_inc(&pos->cl_count); 545 spin_unlock(&nn->nfs_client_lock); 546 547 nfs_put_client(*prev); 548 *prev = pos; 549 550 status = nfs_wait_client_init_complete(pos); 551 spin_lock(&nn->nfs_client_lock); 552 553 if (status < 0) 554 return status; 555 } 556 557 if (pos->cl_cons_state != NFS_CS_READY) 558 return 1; 559 560 if (pos->cl_clientid != new->cl_clientid) 561 return 1; 562 563 /* NFSv4.1 always uses the uniform string, however someone 564 * might switch the uniquifier string on us. 565 */ 566 if (!nfs4_match_client_owner_id(pos, new)) 567 return 1; 568 569 return 0; 570 } 571 572 /** 573 * nfs40_walk_client_list - Find server that recognizes a client ID 574 * 575 * @new: nfs_client with client ID to test 576 * @result: OUT: found nfs_client, or new 577 * @cred: credential to use for trunking test 578 * 579 * Returns zero, a negative errno, or a negative NFS4ERR status. 580 * If zero is returned, an nfs_client pointer is planted in "result." 581 * 582 * NB: nfs40_walk_client_list() relies on the new nfs_client being 583 * the last nfs_client on the list. 584 */ 585 int nfs40_walk_client_list(struct nfs_client *new, 586 struct nfs_client **result, 587 const struct cred *cred) 588 { 589 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 590 struct nfs_client *pos, *prev = NULL; 591 struct nfs4_setclientid_res clid = { 592 .clientid = new->cl_clientid, 593 .confirm = new->cl_confirm, 594 }; 595 int status = -NFS4ERR_STALE_CLIENTID; 596 597 spin_lock(&nn->nfs_client_lock); 598 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 599 600 if (pos == new) 601 goto found; 602 603 status = nfs4_match_client(pos, new, &prev, nn); 604 if (status < 0) 605 goto out_unlock; 606 if (status != 0) 607 continue; 608 /* 609 * We just sent a new SETCLIENTID, which should have 610 * caused the server to return a new cl_confirm. So if 611 * cl_confirm is the same, then this is a different 612 * server that just returned the same cl_confirm by 613 * coincidence: 614 */ 615 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 616 &new->cl_confirm)) 617 continue; 618 /* 619 * But if the cl_confirm's are different, then the only 620 * way that a SETCLIENTID_CONFIRM to pos can succeed is 621 * if new and pos point to the same server: 622 */ 623 found: 624 refcount_inc(&pos->cl_count); 625 spin_unlock(&nn->nfs_client_lock); 626 627 nfs_put_client(prev); 628 prev = pos; 629 630 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 631 switch (status) { 632 case -NFS4ERR_STALE_CLIENTID: 633 break; 634 case 0: 635 nfs4_swap_callback_idents(pos, new); 636 pos->cl_confirm = new->cl_confirm; 637 nfs_mark_client_ready(pos, NFS_CS_READY); 638 639 prev = NULL; 640 *result = pos; 641 goto out; 642 case -ERESTARTSYS: 643 case -ETIMEDOUT: 644 /* The callback path may have been inadvertently 645 * changed. Schedule recovery! 646 */ 647 nfs4_schedule_path_down_recovery(pos); 648 goto out; 649 default: 650 goto out; 651 } 652 653 spin_lock(&nn->nfs_client_lock); 654 } 655 out_unlock: 656 spin_unlock(&nn->nfs_client_lock); 657 658 /* No match found. The server lost our clientid */ 659 out: 660 nfs_put_client(prev); 661 return status; 662 } 663 664 #ifdef CONFIG_NFS_V4_1 665 /* 666 * Returns true if the server major ids match 667 */ 668 bool 669 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 670 struct nfs41_server_owner *o2) 671 { 672 if (o1->major_id_sz != o2->major_id_sz) 673 return false; 674 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 675 } 676 677 /* 678 * Returns true if the server scopes match 679 */ 680 static bool 681 nfs4_check_server_scope(struct nfs41_server_scope *s1, 682 struct nfs41_server_scope *s2) 683 { 684 if (s1->server_scope_sz != s2->server_scope_sz) 685 return false; 686 return memcmp(s1->server_scope, s2->server_scope, 687 s1->server_scope_sz) == 0; 688 } 689 690 /** 691 * nfs4_detect_session_trunking - Checks for session trunking. 692 * @clp: original mount nfs_client 693 * @res: result structure from an exchange_id using the original mount 694 * nfs_client with a new multi_addr transport 695 * @xprt: pointer to the transport to add. 696 * 697 * Called after a successful EXCHANGE_ID on a multi-addr connection. 698 * Upon success, add the transport. 699 * 700 * Returns zero on success, otherwise -EINVAL 701 * 702 * Note: since the exchange_id for the new multi_addr transport uses the 703 * same nfs_client from the original mount, the cl_owner_id is reused, 704 * so eir_clientowner is the same. 705 */ 706 int nfs4_detect_session_trunking(struct nfs_client *clp, 707 struct nfs41_exchange_id_res *res, 708 struct rpc_xprt *xprt) 709 { 710 /* Check eir_clientid */ 711 if (clp->cl_clientid != res->clientid) 712 goto out_err; 713 714 /* Check eir_server_owner so_major_id */ 715 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 716 res->server_owner)) 717 goto out_err; 718 719 /* Check eir_server_owner so_minor_id */ 720 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 721 goto out_err; 722 723 /* Check eir_server_scope */ 724 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 725 goto out_err; 726 727 pr_info("NFS: %s: Session trunking succeeded for %s\n", 728 clp->cl_hostname, 729 xprt->address_strings[RPC_DISPLAY_ADDR]); 730 731 return 0; 732 out_err: 733 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 734 xprt->address_strings[RPC_DISPLAY_ADDR]); 735 736 return -EINVAL; 737 } 738 739 /** 740 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 741 * 742 * @new: nfs_client with client ID to test 743 * @result: OUT: found nfs_client, or new 744 * @cred: credential to use for trunking test 745 * 746 * Returns zero, a negative errno, or a negative NFS4ERR status. 747 * If zero is returned, an nfs_client pointer is planted in "result." 748 * 749 * NB: nfs41_walk_client_list() relies on the new nfs_client being 750 * the last nfs_client on the list. 751 */ 752 int nfs41_walk_client_list(struct nfs_client *new, 753 struct nfs_client **result, 754 const struct cred *cred) 755 { 756 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 757 struct nfs_client *pos, *prev = NULL; 758 int status = -NFS4ERR_STALE_CLIENTID; 759 760 spin_lock(&nn->nfs_client_lock); 761 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 762 763 if (pos == new) 764 goto found; 765 766 status = nfs4_match_client(pos, new, &prev, nn); 767 if (status < 0) 768 goto out; 769 if (status != 0) 770 continue; 771 772 /* 773 * Note that session trunking is just a special subcase of 774 * client id trunking. In either case, we want to fall back 775 * to using the existing nfs_client. 776 */ 777 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 778 new->cl_serverowner)) 779 continue; 780 781 found: 782 refcount_inc(&pos->cl_count); 783 *result = pos; 784 status = 0; 785 break; 786 } 787 788 out: 789 spin_unlock(&nn->nfs_client_lock); 790 nfs_put_client(prev); 791 return status; 792 } 793 #endif /* CONFIG_NFS_V4_1 */ 794 795 static void nfs4_destroy_server(struct nfs_server *server) 796 { 797 LIST_HEAD(freeme); 798 799 nfs_server_return_all_delegations(server); 800 unset_pnfs_layoutdriver(server); 801 nfs4_purge_state_owners(server, &freeme); 802 nfs4_free_state_owners(&freeme); 803 } 804 805 /* 806 * NFSv4.0 callback thread helper 807 * 808 * Find a client by callback identifier 809 */ 810 struct nfs_client * 811 nfs4_find_client_ident(struct net *net, int cb_ident) 812 { 813 struct nfs_client *clp; 814 struct nfs_net *nn = net_generic(net, nfs_net_id); 815 816 spin_lock(&nn->nfs_client_lock); 817 clp = idr_find(&nn->cb_ident_idr, cb_ident); 818 if (clp) 819 refcount_inc(&clp->cl_count); 820 spin_unlock(&nn->nfs_client_lock); 821 return clp; 822 } 823 824 #if defined(CONFIG_NFS_V4_1) 825 /* Common match routine for v4.0 and v4.1 callback services */ 826 static bool nfs4_cb_match_client(const struct sockaddr *addr, 827 struct nfs_client *clp, u32 minorversion) 828 { 829 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 830 831 /* Don't match clients that failed to initialise */ 832 if (!(clp->cl_cons_state == NFS_CS_READY || 833 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 834 return false; 835 836 smp_rmb(); 837 838 /* Match the version and minorversion */ 839 if (clp->rpc_ops->version != 4 || 840 clp->cl_minorversion != minorversion) 841 return false; 842 843 /* Match only the IP address, not the port number */ 844 return rpc_cmp_addr(addr, clap); 845 } 846 847 /* 848 * NFSv4.1 callback thread helper 849 * For CB_COMPOUND calls, find a client by IP address, protocol version, 850 * minorversion, and sessionID 851 * 852 * Returns NULL if no such client 853 */ 854 struct nfs_client * 855 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 856 struct nfs4_sessionid *sid, u32 minorversion) 857 { 858 struct nfs_client *clp; 859 struct nfs_net *nn = net_generic(net, nfs_net_id); 860 861 spin_lock(&nn->nfs_client_lock); 862 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 863 if (!nfs4_cb_match_client(addr, clp, minorversion)) 864 continue; 865 866 if (!nfs4_has_session(clp)) 867 continue; 868 869 /* Match sessionid*/ 870 if (memcmp(clp->cl_session->sess_id.data, 871 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 872 continue; 873 874 refcount_inc(&clp->cl_count); 875 spin_unlock(&nn->nfs_client_lock); 876 return clp; 877 } 878 spin_unlock(&nn->nfs_client_lock); 879 return NULL; 880 } 881 882 #else /* CONFIG_NFS_V4_1 */ 883 884 struct nfs_client * 885 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 886 struct nfs4_sessionid *sid, u32 minorversion) 887 { 888 return NULL; 889 } 890 #endif /* CONFIG_NFS_V4_1 */ 891 892 /* 893 * Set up an NFS4 client 894 */ 895 static int nfs4_set_client(struct nfs_server *server, 896 const char *hostname, 897 const struct sockaddr_storage *addr, 898 const size_t addrlen, 899 const char *ip_addr, 900 int proto, const struct rpc_timeout *timeparms, 901 u32 minorversion, unsigned int nconnect, 902 unsigned int max_connect, 903 struct net *net, 904 struct xprtsec_parms *xprtsec) 905 { 906 struct nfs_client_initdata cl_init = { 907 .hostname = hostname, 908 .addr = addr, 909 .addrlen = addrlen, 910 .ip_addr = ip_addr, 911 .nfs_mod = &nfs_v4, 912 .proto = proto, 913 .minorversion = minorversion, 914 .net = net, 915 .timeparms = timeparms, 916 .cred = server->cred, 917 .xprtsec = *xprtsec, 918 }; 919 struct nfs_client *clp; 920 921 if (minorversion == 0) 922 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags); 923 else 924 cl_init.max_connect = max_connect; 925 switch (proto) { 926 case XPRT_TRANSPORT_RDMA: 927 case XPRT_TRANSPORT_TCP: 928 case XPRT_TRANSPORT_TCP_TLS: 929 cl_init.nconnect = nconnect; 930 } 931 932 if (server->flags & NFS_MOUNT_NORESVPORT) 933 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 934 if (server->options & NFS_OPTION_MIGRATION) 935 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 936 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 937 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags); 938 server->port = rpc_get_port((struct sockaddr *)addr); 939 940 /* Allocate or find a client reference we can use */ 941 clp = nfs_get_client(&cl_init); 942 if (IS_ERR(clp)) 943 return PTR_ERR(clp); 944 945 if (server->nfs_client == clp) { 946 nfs_put_client(clp); 947 return -ELOOP; 948 } 949 950 /* 951 * Query for the lease time on clientid setup or renewal 952 * 953 * Note that this will be set on nfs_clients that were created 954 * only for the DS role and did not set this bit, but now will 955 * serve a dual role. 956 */ 957 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 958 959 server->nfs_client = clp; 960 nfs_sysfs_add_server(server); 961 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 962 963 return 0; 964 } 965 966 /* 967 * Set up a pNFS Data Server client. 968 * 969 * Return any existing nfs_client that matches server address,port,version 970 * and minorversion. 971 * 972 * For a new nfs_client, use a soft mount (default), a low retrans and a 973 * low timeout interval so that if a connection is lost, we retry through 974 * the MDS. 975 */ 976 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 977 const struct sockaddr_storage *ds_addr, int ds_addrlen, 978 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 979 u32 minor_version) 980 { 981 struct rpc_timeout ds_timeout; 982 struct nfs_client *mds_clp = mds_srv->nfs_client; 983 struct nfs_client_initdata cl_init = { 984 .addr = ds_addr, 985 .addrlen = ds_addrlen, 986 .nodename = mds_clp->cl_rpcclient->cl_nodename, 987 .ip_addr = mds_clp->cl_ipaddr, 988 .nfs_mod = &nfs_v4, 989 .proto = ds_proto, 990 .minorversion = minor_version, 991 .net = mds_clp->cl_net, 992 .timeparms = &ds_timeout, 993 .cred = mds_srv->cred, 994 .xprtsec = mds_srv->nfs_client->cl_xprtsec, 995 }; 996 char buf[INET6_ADDRSTRLEN + 1]; 997 998 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0) 999 return ERR_PTR(-EINVAL); 1000 cl_init.hostname = buf; 1001 1002 switch (ds_proto) { 1003 case XPRT_TRANSPORT_RDMA: 1004 case XPRT_TRANSPORT_TCP: 1005 case XPRT_TRANSPORT_TCP_TLS: 1006 if (mds_clp->cl_nconnect > 1) { 1007 cl_init.nconnect = mds_clp->cl_nconnect; 1008 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1009 } 1010 } 1011 1012 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 1013 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 1014 1015 __set_bit(NFS_CS_PNFS, &cl_init.init_flags); 1016 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1017 /* 1018 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1019 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1020 * (section 13.1 RFC 5661). 1021 */ 1022 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 1023 return nfs_get_client(&cl_init); 1024 } 1025 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1026 1027 /* 1028 * Session has been established, and the client marked ready. 1029 * Limit the mount rsize, wsize and dtsize using negotiated fore 1030 * channel attributes. 1031 */ 1032 static void nfs4_session_limit_rwsize(struct nfs_server *server) 1033 { 1034 #ifdef CONFIG_NFS_V4_1 1035 struct nfs4_session *sess; 1036 u32 server_resp_sz; 1037 u32 server_rqst_sz; 1038 1039 if (!nfs4_has_session(server->nfs_client)) 1040 return; 1041 sess = server->nfs_client->cl_session; 1042 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1043 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1044 1045 if (server->dtsize > server_resp_sz) 1046 server->dtsize = server_resp_sz; 1047 if (server->rsize > server_resp_sz) 1048 server->rsize = server_resp_sz; 1049 if (server->wsize > server_rqst_sz) 1050 server->wsize = server_rqst_sz; 1051 #endif /* CONFIG_NFS_V4_1 */ 1052 } 1053 1054 /* 1055 * Limit xattr sizes using the channel attributes. 1056 */ 1057 static void nfs4_session_limit_xasize(struct nfs_server *server) 1058 { 1059 #ifdef CONFIG_NFS_V4_2 1060 struct nfs4_session *sess; 1061 u32 server_gxa_sz; 1062 u32 server_sxa_sz; 1063 u32 server_lxa_sz; 1064 1065 if (!nfs4_has_session(server->nfs_client)) 1066 return; 1067 1068 sess = server->nfs_client->cl_session; 1069 1070 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead; 1071 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead; 1072 server_lxa_sz = sess->fc_attrs.max_resp_sz - 1073 nfs42_maxlistxattrs_overhead; 1074 1075 if (server->gxasize > server_gxa_sz) 1076 server->gxasize = server_gxa_sz; 1077 if (server->sxasize > server_sxa_sz) 1078 server->sxasize = server_sxa_sz; 1079 if (server->lxasize > server_lxa_sz) 1080 server->lxasize = server_lxa_sz; 1081 #endif 1082 } 1083 1084 void nfs4_server_set_init_caps(struct nfs_server *server) 1085 { 1086 /* Set the basic capabilities */ 1087 server->caps |= server->nfs_client->cl_mvops->init_caps; 1088 if (server->flags & NFS_MOUNT_NORDIRPLUS) 1089 server->caps &= ~NFS_CAP_READDIRPLUS; 1090 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA) 1091 server->caps &= ~NFS_CAP_READ_PLUS; 1092 1093 /* 1094 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1095 * authentication. 1096 */ 1097 if (nfs4_disable_idmapping && 1098 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 1099 server->caps |= NFS_CAP_UIDGID_NOMAP; 1100 } 1101 1102 static int nfs4_server_common_setup(struct nfs_server *server, 1103 struct nfs_fh *mntfh, bool auth_probe) 1104 { 1105 int error; 1106 1107 /* data servers support only a subset of NFSv4.1 */ 1108 if (is_ds_only_client(server->nfs_client)) 1109 return -EPROTONOSUPPORT; 1110 1111 /* We must ensure the session is initialised first */ 1112 error = nfs4_init_session(server->nfs_client); 1113 if (error < 0) 1114 goto out; 1115 1116 nfs4_server_set_init_caps(server); 1117 1118 /* Probe the root fh to retrieve its FSID and filehandle */ 1119 error = nfs4_get_rootfh(server, mntfh, auth_probe); 1120 if (error < 0) 1121 goto out; 1122 1123 dprintk("Server FSID: %llx:%llx\n", 1124 (unsigned long long) server->fsid.major, 1125 (unsigned long long) server->fsid.minor); 1126 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1127 1128 error = nfs_probe_server(server, mntfh); 1129 if (error < 0) 1130 goto out; 1131 1132 nfs4_session_limit_rwsize(server); 1133 nfs4_session_limit_xasize(server); 1134 1135 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1136 server->namelen = NFS4_MAXNAMLEN; 1137 1138 nfs_server_insert_lists(server); 1139 server->mount_time = jiffies; 1140 server->destroy = nfs4_destroy_server; 1141 out: 1142 return error; 1143 } 1144 1145 /* 1146 * Create a version 4 volume record 1147 */ 1148 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc) 1149 { 1150 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1151 struct rpc_timeout timeparms; 1152 int error; 1153 1154 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 1155 ctx->timeo, ctx->retrans); 1156 1157 /* Initialise the client representation from the mount data */ 1158 server->flags = ctx->flags; 1159 server->options = ctx->options; 1160 server->auth_info = ctx->auth_info; 1161 1162 /* Use the first specified auth flavor. If this flavor isn't 1163 * allowed by the server, use the SECINFO path to try the 1164 * other specified flavors */ 1165 if (ctx->auth_info.flavor_len >= 1) 1166 ctx->selected_flavor = ctx->auth_info.flavors[0]; 1167 else 1168 ctx->selected_flavor = RPC_AUTH_UNIX; 1169 1170 /* Get a client record */ 1171 error = nfs4_set_client(server, 1172 ctx->nfs_server.hostname, 1173 &ctx->nfs_server._address, 1174 ctx->nfs_server.addrlen, 1175 ctx->client_address, 1176 ctx->nfs_server.protocol, 1177 &timeparms, 1178 ctx->minorversion, 1179 ctx->nfs_server.nconnect, 1180 ctx->nfs_server.max_connect, 1181 fc->net_ns, 1182 &ctx->xprtsec); 1183 if (error < 0) 1184 return error; 1185 1186 if (ctx->rsize) 1187 server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto); 1188 if (ctx->wsize) 1189 server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto); 1190 1191 server->acregmin = ctx->acregmin * HZ; 1192 server->acregmax = ctx->acregmax * HZ; 1193 server->acdirmin = ctx->acdirmin * HZ; 1194 server->acdirmax = ctx->acdirmax * HZ; 1195 server->port = ctx->nfs_server.port; 1196 1197 return nfs_init_server_rpcclient(server, &timeparms, 1198 ctx->selected_flavor); 1199 } 1200 1201 /* 1202 * Create a version 4 volume record 1203 * - keyed on server and FSID 1204 */ 1205 struct nfs_server *nfs4_create_server(struct fs_context *fc) 1206 { 1207 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1208 struct nfs_server *server; 1209 bool auth_probe; 1210 int error; 1211 1212 server = nfs_alloc_server(); 1213 if (!server) 1214 return ERR_PTR(-ENOMEM); 1215 1216 server->cred = get_cred(fc->cred); 1217 1218 auth_probe = ctx->auth_info.flavor_len < 1; 1219 1220 /* set up the general RPC client */ 1221 error = nfs4_init_server(server, fc); 1222 if (error < 0) 1223 goto error; 1224 1225 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1226 if (error < 0) 1227 goto error; 1228 1229 return server; 1230 1231 error: 1232 nfs_free_server(server); 1233 return ERR_PTR(error); 1234 } 1235 1236 /* 1237 * Create an NFS4 referral server record 1238 */ 1239 struct nfs_server *nfs4_create_referral_server(struct fs_context *fc) 1240 { 1241 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1242 struct nfs_client *parent_client; 1243 struct nfs_server *server, *parent_server; 1244 int proto, error; 1245 bool auth_probe; 1246 1247 server = nfs_alloc_server(); 1248 if (!server) 1249 return ERR_PTR(-ENOMEM); 1250 1251 parent_server = NFS_SB(ctx->clone_data.sb); 1252 parent_client = parent_server->nfs_client; 1253 1254 server->cred = get_cred(parent_server->cred); 1255 1256 /* Initialise the client representation from the parent server */ 1257 nfs_server_copy_userdata(server, parent_server); 1258 1259 /* Get a client representation */ 1260 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1261 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT); 1262 error = nfs4_set_client(server, 1263 ctx->nfs_server.hostname, 1264 &ctx->nfs_server._address, 1265 ctx->nfs_server.addrlen, 1266 parent_client->cl_ipaddr, 1267 XPRT_TRANSPORT_RDMA, 1268 parent_server->client->cl_timeout, 1269 parent_client->cl_mvops->minor_version, 1270 parent_client->cl_nconnect, 1271 parent_client->cl_max_connect, 1272 parent_client->cl_net, 1273 &parent_client->cl_xprtsec); 1274 if (!error) 1275 goto init_server; 1276 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ 1277 1278 proto = XPRT_TRANSPORT_TCP; 1279 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) 1280 proto = XPRT_TRANSPORT_TCP_TLS; 1281 rpc_set_port(&ctx->nfs_server.address, NFS_PORT); 1282 error = nfs4_set_client(server, 1283 ctx->nfs_server.hostname, 1284 &ctx->nfs_server._address, 1285 ctx->nfs_server.addrlen, 1286 parent_client->cl_ipaddr, 1287 proto, 1288 parent_server->client->cl_timeout, 1289 parent_client->cl_mvops->minor_version, 1290 parent_client->cl_nconnect, 1291 parent_client->cl_max_connect, 1292 parent_client->cl_net, 1293 &parent_client->cl_xprtsec); 1294 if (error < 0) 1295 goto error; 1296 1297 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1298 init_server: 1299 #endif 1300 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, 1301 ctx->selected_flavor); 1302 if (error < 0) 1303 goto error; 1304 1305 auth_probe = parent_server->auth_info.flavor_len < 1; 1306 1307 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1308 if (error < 0) 1309 goto error; 1310 1311 return server; 1312 1313 error: 1314 nfs_free_server(server); 1315 return ERR_PTR(error); 1316 } 1317 1318 /** 1319 * nfs4_update_server - Move an nfs_server to a different nfs_client 1320 * 1321 * @server: represents FSID to be moved 1322 * @hostname: new end-point's hostname 1323 * @sap: new end-point's socket address 1324 * @salen: size of "sap" 1325 * @net: net namespace 1326 * 1327 * The nfs_server must be quiescent before this function is invoked. 1328 * Either its session is drained (NFSv4.1+), or its transport is 1329 * plugged and drained (NFSv4.0). 1330 * 1331 * Returns zero on success, or a negative errno value. 1332 */ 1333 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1334 struct sockaddr_storage *sap, size_t salen, struct net *net) 1335 { 1336 struct nfs_client *clp = server->nfs_client; 1337 struct rpc_clnt *clnt = server->client; 1338 struct xprt_create xargs = { 1339 .ident = clp->cl_proto, 1340 .net = net, 1341 .dstaddr = (struct sockaddr *)sap, 1342 .addrlen = salen, 1343 .servername = hostname, 1344 /* cel: bleh. We might need to pass TLS parameters here */ 1345 }; 1346 char buf[INET6_ADDRSTRLEN + 1]; 1347 struct sockaddr_storage address; 1348 struct sockaddr *localaddr = (struct sockaddr *)&address; 1349 int error; 1350 1351 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1352 if (error != 0) 1353 return error; 1354 1355 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1356 if (error != 0) 1357 return error; 1358 1359 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1360 return -EAFNOSUPPORT; 1361 1362 nfs_server_remove_lists(server); 1363 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1364 error = nfs4_set_client(server, hostname, sap, salen, buf, 1365 clp->cl_proto, clnt->cl_timeout, 1366 clp->cl_minorversion, 1367 clp->cl_nconnect, clp->cl_max_connect, 1368 net, &clp->cl_xprtsec); 1369 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1370 if (error != 0) { 1371 nfs_server_insert_lists(server); 1372 return error; 1373 } 1374 nfs_put_client(clp); 1375 1376 if (server->nfs_client->cl_hostname == NULL) { 1377 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1378 if (server->nfs_client->cl_hostname == NULL) 1379 return -ENOMEM; 1380 } 1381 nfs_server_insert_lists(server); 1382 1383 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root))); 1384 } 1385