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