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 clp->cl_last_renewal = jiffies; 226 #if IS_ENABLED(CONFIG_NFS_V4_1) 227 init_waitqueue_head(&clp->cl_lock_waitq); 228 #endif 229 INIT_LIST_HEAD(&clp->pending_cb_stateids); 230 231 if (cl_init->minorversion != 0) 232 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 233 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 234 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 235 if (test_bit(NFS_CS_PNFS, &cl_init->init_flags)) 236 __set_bit(NFS_CS_PNFS, &clp->cl_flags); 237 if (test_bit(NFS_CS_NETUNREACH_FATAL, &cl_init->init_flags)) 238 __set_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags); 239 /* 240 * Set up the connection to the server before we add add to the 241 * global list. 242 */ 243 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 244 if (err == -EINVAL) 245 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 246 if (err < 0) 247 goto error; 248 249 /* If no clientaddr= option was specified, find a usable cb address */ 250 if (ip_addr == NULL) { 251 struct sockaddr_storage cb_addr; 252 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 253 254 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 255 if (err < 0) 256 goto error; 257 err = rpc_ntop(sap, buf, sizeof(buf)); 258 if (err < 0) 259 goto error; 260 ip_addr = (const char *)buf; 261 } 262 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 263 264 err = nfs_idmap_new(clp); 265 if (err < 0) { 266 dprintk("%s: failed to create idmapper. Error = %d\n", 267 __func__, err); 268 goto error; 269 } 270 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 271 return clp; 272 273 error: 274 nfs_free_client(clp); 275 return ERR_PTR(err); 276 } 277 278 /* 279 * Destroy the NFS4 callback service 280 */ 281 static void nfs4_destroy_callback(struct nfs_client *clp) 282 { 283 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 284 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 285 } 286 287 static void nfs4_shutdown_client(struct nfs_client *clp) 288 { 289 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 290 nfs4_kill_renewd(clp); 291 clp->cl_mvops->shutdown_client(clp); 292 nfs4_destroy_callback(clp); 293 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 294 nfs_idmap_delete(clp); 295 296 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 297 kfree(clp->cl_serverowner); 298 kfree(clp->cl_serverscope); 299 kfree(clp->cl_implid); 300 kfree(clp->cl_owner_id); 301 } 302 303 void nfs4_free_client(struct nfs_client *clp) 304 { 305 nfs4_shutdown_client(clp); 306 nfs_free_client(clp); 307 } 308 309 /* 310 * Initialize the NFS4 callback service 311 */ 312 static int nfs4_init_callback(struct nfs_client *clp) 313 { 314 struct rpc_xprt *xprt; 315 int error; 316 317 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 318 319 if (nfs4_has_session(clp)) { 320 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 321 if (error < 0) 322 return error; 323 } 324 325 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 326 if (error < 0) { 327 dprintk("%s: failed to start callback. Error = %d\n", 328 __func__, error); 329 return error; 330 } 331 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 332 333 return 0; 334 } 335 336 /** 337 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 338 * @clp: nfs_client to initialize 339 * 340 * Returns zero on success, or a negative errno if some error occurred. 341 */ 342 int nfs40_init_client(struct nfs_client *clp) 343 { 344 struct nfs4_slot_table *tbl; 345 int ret; 346 347 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 348 if (tbl == NULL) 349 return -ENOMEM; 350 351 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 352 "NFSv4.0 transport Slot table"); 353 if (ret) { 354 nfs4_shutdown_slot_table(tbl); 355 kfree(tbl); 356 return ret; 357 } 358 359 clp->cl_slot_tbl = tbl; 360 return 0; 361 } 362 363 #if defined(CONFIG_NFS_V4_1) 364 365 /** 366 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 367 * @clp: nfs_client to initialize 368 * 369 * Returns zero on success, or a negative errno if some error occurred. 370 */ 371 int nfs41_init_client(struct nfs_client *clp) 372 { 373 struct nfs4_session *session = NULL; 374 375 /* 376 * Create the session and mark it expired. 377 * When a SEQUENCE operation encounters the expired session 378 * it will do session recovery to initialize it. 379 */ 380 session = nfs4_alloc_session(clp); 381 if (!session) 382 return -ENOMEM; 383 384 clp->cl_session = session; 385 386 /* 387 * The create session reply races with the server back 388 * channel probe. Mark the client NFS_CS_SESSION_INITING 389 * so that the client back channel can find the 390 * nfs_client struct 391 */ 392 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 393 return 0; 394 } 395 396 #endif /* CONFIG_NFS_V4_1 */ 397 398 /* 399 * Initialize the minor version specific parts of an NFS4 client record 400 */ 401 static int nfs4_init_client_minor_version(struct nfs_client *clp) 402 { 403 int ret; 404 405 ret = clp->cl_mvops->init_client(clp); 406 if (ret) 407 return ret; 408 return nfs4_init_callback(clp); 409 } 410 411 static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old) 412 { 413 struct sockaddr_storage clp_addr, old_addr; 414 struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr; 415 struct sockaddr *old_sap = (struct sockaddr *)&old_addr; 416 size_t clp_salen; 417 struct xprt_create xprt_args = { 418 .ident = old->cl_proto, 419 .net = old->cl_net, 420 .servername = old->cl_hostname, 421 }; 422 int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ? 423 clp->cl_max_connect : old->cl_max_connect; 424 425 if (clp->cl_proto != old->cl_proto) 426 return; 427 clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr)); 428 rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr)); 429 430 if (clp_addr.ss_family != old_addr.ss_family) 431 return; 432 433 xprt_args.dstaddr = clp_sap; 434 xprt_args.addrlen = clp_salen; 435 436 rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args, 437 rpc_clnt_test_and_add_xprt, &max_connect); 438 } 439 440 /** 441 * nfs4_init_client - Initialise an NFS4 client record 442 * 443 * @clp: nfs_client to initialise 444 * @cl_init: pointer to nfs_client_initdata 445 * 446 * Returns pointer to an NFS client, or an ERR_PTR value. 447 */ 448 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 449 const struct nfs_client_initdata *cl_init) 450 { 451 struct nfs_client *old; 452 int error; 453 454 if (clp->cl_cons_state == NFS_CS_READY) 455 /* the client is initialised already */ 456 return clp; 457 458 error = nfs4_init_client_minor_version(clp); 459 if (error < 0) 460 goto error; 461 462 error = nfs4_discover_server_trunking(clp, &old); 463 if (error < 0) 464 goto error; 465 466 if (clp != old) { 467 clp->cl_preserve_clid = true; 468 /* 469 * Mark the client as having failed initialization so other 470 * processes walking the nfs_client_list in nfs_match_client() 471 * won't try to use it. 472 */ 473 nfs_mark_client_ready(clp, -EPERM); 474 if (old->cl_mvops->session_trunk) 475 nfs4_add_trunk(clp, old); 476 } 477 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 478 nfs_put_client(clp); 479 return old; 480 481 error: 482 nfs_mark_client_ready(clp, error); 483 nfs_put_client(clp); 484 return ERR_PTR(error); 485 } 486 487 /* 488 * SETCLIENTID just did a callback update with the callback ident in 489 * "drop," but server trunking discovery claims "drop" and "keep" are 490 * actually the same server. Swap the callback IDs so that "keep" 491 * will continue to use the callback ident the server now knows about, 492 * and so that "keep"'s original callback ident is destroyed when 493 * "drop" is freed. 494 */ 495 static void nfs4_swap_callback_idents(struct nfs_client *keep, 496 struct nfs_client *drop) 497 { 498 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 499 unsigned int save = keep->cl_cb_ident; 500 501 if (keep->cl_cb_ident == drop->cl_cb_ident) 502 return; 503 504 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 505 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 506 507 spin_lock(&nn->nfs_client_lock); 508 509 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 510 keep->cl_cb_ident = drop->cl_cb_ident; 511 512 idr_replace(&nn->cb_ident_idr, drop, save); 513 drop->cl_cb_ident = save; 514 515 spin_unlock(&nn->nfs_client_lock); 516 } 517 518 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 519 const struct nfs_client *clp2) 520 { 521 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 522 return true; 523 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 524 } 525 526 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 527 { 528 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 529 } 530 531 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 532 struct nfs_client **prev, struct nfs_net *nn) 533 { 534 int status; 535 536 if (pos->rpc_ops != new->rpc_ops) 537 return 1; 538 539 if (pos->cl_minorversion != new->cl_minorversion) 540 return 1; 541 542 /* If "pos" isn't marked ready, we can't trust the 543 * remaining fields in "pos", especially the client 544 * ID and serverowner fields. Wait for CREATE_SESSION 545 * to finish. */ 546 if (pos->cl_cons_state > NFS_CS_READY) { 547 refcount_inc(&pos->cl_count); 548 spin_unlock(&nn->nfs_client_lock); 549 550 nfs_put_client(*prev); 551 *prev = pos; 552 553 status = nfs_wait_client_init_complete(pos); 554 spin_lock(&nn->nfs_client_lock); 555 556 if (status < 0) 557 return status; 558 } 559 560 if (pos->cl_cons_state != NFS_CS_READY) 561 return 1; 562 563 if (pos->cl_clientid != new->cl_clientid) 564 return 1; 565 566 /* NFSv4.1 always uses the uniform string, however someone 567 * might switch the uniquifier string on us. 568 */ 569 if (!nfs4_match_client_owner_id(pos, new)) 570 return 1; 571 572 return 0; 573 } 574 575 /** 576 * nfs40_walk_client_list - Find server that recognizes a client ID 577 * 578 * @new: nfs_client with client ID to test 579 * @result: OUT: found nfs_client, or new 580 * @cred: credential to use for trunking test 581 * 582 * Returns zero, a negative errno, or a negative NFS4ERR status. 583 * If zero is returned, an nfs_client pointer is planted in "result." 584 * 585 * NB: nfs40_walk_client_list() relies on the new nfs_client being 586 * the last nfs_client on the list. 587 */ 588 int nfs40_walk_client_list(struct nfs_client *new, 589 struct nfs_client **result, 590 const struct cred *cred) 591 { 592 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 593 struct nfs_client *pos, *prev = NULL; 594 struct nfs4_setclientid_res clid = { 595 .clientid = new->cl_clientid, 596 .confirm = new->cl_confirm, 597 }; 598 int status = -NFS4ERR_STALE_CLIENTID; 599 600 spin_lock(&nn->nfs_client_lock); 601 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 602 603 if (pos == new) 604 goto found; 605 606 status = nfs4_match_client(pos, new, &prev, nn); 607 if (status < 0) 608 goto out_unlock; 609 if (status != 0) 610 continue; 611 /* 612 * We just sent a new SETCLIENTID, which should have 613 * caused the server to return a new cl_confirm. So if 614 * cl_confirm is the same, then this is a different 615 * server that just returned the same cl_confirm by 616 * coincidence: 617 */ 618 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 619 &new->cl_confirm)) 620 continue; 621 /* 622 * But if the cl_confirm's are different, then the only 623 * way that a SETCLIENTID_CONFIRM to pos can succeed is 624 * if new and pos point to the same server: 625 */ 626 found: 627 refcount_inc(&pos->cl_count); 628 spin_unlock(&nn->nfs_client_lock); 629 630 nfs_put_client(prev); 631 prev = pos; 632 633 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 634 switch (status) { 635 case -NFS4ERR_STALE_CLIENTID: 636 break; 637 case 0: 638 nfs4_swap_callback_idents(pos, new); 639 pos->cl_confirm = new->cl_confirm; 640 nfs_mark_client_ready(pos, NFS_CS_READY); 641 642 prev = NULL; 643 *result = pos; 644 goto out; 645 case -ERESTARTSYS: 646 case -ETIMEDOUT: 647 /* The callback path may have been inadvertently 648 * changed. Schedule recovery! 649 */ 650 nfs4_schedule_path_down_recovery(pos); 651 goto out; 652 default: 653 goto out; 654 } 655 656 spin_lock(&nn->nfs_client_lock); 657 } 658 out_unlock: 659 spin_unlock(&nn->nfs_client_lock); 660 661 /* No match found. The server lost our clientid */ 662 out: 663 nfs_put_client(prev); 664 return status; 665 } 666 667 #ifdef CONFIG_NFS_V4_1 668 /* 669 * Returns true if the server major ids match 670 */ 671 bool 672 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 673 struct nfs41_server_owner *o2) 674 { 675 if (o1->major_id_sz != o2->major_id_sz) 676 return false; 677 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 678 } 679 680 /* 681 * Returns true if the server scopes match 682 */ 683 static bool 684 nfs4_check_server_scope(struct nfs41_server_scope *s1, 685 struct nfs41_server_scope *s2) 686 { 687 if (s1->server_scope_sz != s2->server_scope_sz) 688 return false; 689 return memcmp(s1->server_scope, s2->server_scope, 690 s1->server_scope_sz) == 0; 691 } 692 693 /** 694 * nfs4_detect_session_trunking - Checks for session trunking. 695 * @clp: original mount nfs_client 696 * @res: result structure from an exchange_id using the original mount 697 * nfs_client with a new multi_addr transport 698 * @xprt: pointer to the transport to add. 699 * 700 * Called after a successful EXCHANGE_ID on a multi-addr connection. 701 * Upon success, add the transport. 702 * 703 * Returns zero on success, otherwise -EINVAL 704 * 705 * Note: since the exchange_id for the new multi_addr transport uses the 706 * same nfs_client from the original mount, the cl_owner_id is reused, 707 * so eir_clientowner is the same. 708 */ 709 int nfs4_detect_session_trunking(struct nfs_client *clp, 710 struct nfs41_exchange_id_res *res, 711 struct rpc_xprt *xprt) 712 { 713 /* Check eir_clientid */ 714 if (clp->cl_clientid != res->clientid) 715 goto out_err; 716 717 /* Check eir_server_owner so_major_id */ 718 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 719 res->server_owner)) 720 goto out_err; 721 722 /* Check eir_server_owner so_minor_id */ 723 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 724 goto out_err; 725 726 /* Check eir_server_scope */ 727 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 728 goto out_err; 729 730 pr_info("NFS: %s: Session trunking succeeded for %s\n", 731 clp->cl_hostname, 732 xprt->address_strings[RPC_DISPLAY_ADDR]); 733 734 return 0; 735 out_err: 736 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 737 xprt->address_strings[RPC_DISPLAY_ADDR]); 738 739 return -EINVAL; 740 } 741 742 /** 743 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 744 * 745 * @new: nfs_client with client ID to test 746 * @result: OUT: found nfs_client, or new 747 * @cred: credential to use for trunking test 748 * 749 * Returns zero, a negative errno, or a negative NFS4ERR status. 750 * If zero is returned, an nfs_client pointer is planted in "result." 751 * 752 * NB: nfs41_walk_client_list() relies on the new nfs_client being 753 * the last nfs_client on the list. 754 */ 755 int nfs41_walk_client_list(struct nfs_client *new, 756 struct nfs_client **result, 757 const struct cred *cred) 758 { 759 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 760 struct nfs_client *pos, *prev = NULL; 761 int status = -NFS4ERR_STALE_CLIENTID; 762 763 spin_lock(&nn->nfs_client_lock); 764 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 765 766 if (pos == new) 767 goto found; 768 769 status = nfs4_match_client(pos, new, &prev, nn); 770 if (status < 0) 771 goto out; 772 if (status != 0) 773 continue; 774 775 /* 776 * Note that session trunking is just a special subcase of 777 * client id trunking. In either case, we want to fall back 778 * to using the existing nfs_client. 779 */ 780 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 781 new->cl_serverowner)) 782 continue; 783 784 found: 785 refcount_inc(&pos->cl_count); 786 *result = pos; 787 status = 0; 788 break; 789 } 790 791 out: 792 spin_unlock(&nn->nfs_client_lock); 793 nfs_put_client(prev); 794 return status; 795 } 796 #endif /* CONFIG_NFS_V4_1 */ 797 798 static void nfs4_destroy_server(struct nfs_server *server) 799 { 800 LIST_HEAD(freeme); 801 802 nfs_server_return_all_delegations(server); 803 unset_pnfs_layoutdriver(server); 804 nfs4_purge_state_owners(server, &freeme); 805 nfs4_free_state_owners(&freeme); 806 kfree(server->delegation_hash_table); 807 } 808 809 /* 810 * NFSv4.0 callback thread helper 811 * 812 * Find a client by callback identifier 813 */ 814 struct nfs_client * 815 nfs4_find_client_ident(struct net *net, int cb_ident) 816 { 817 struct nfs_client *clp; 818 struct nfs_net *nn = net_generic(net, nfs_net_id); 819 820 spin_lock(&nn->nfs_client_lock); 821 clp = idr_find(&nn->cb_ident_idr, cb_ident); 822 if (clp) 823 refcount_inc(&clp->cl_count); 824 spin_unlock(&nn->nfs_client_lock); 825 return clp; 826 } 827 828 #if defined(CONFIG_NFS_V4_1) 829 /* Common match routine for v4.0 and v4.1 callback services */ 830 static bool nfs4_cb_match_client(const struct sockaddr *addr, 831 struct nfs_client *clp, u32 minorversion) 832 { 833 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 834 835 /* Don't match clients that failed to initialise */ 836 if (!(clp->cl_cons_state == NFS_CS_READY || 837 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 838 return false; 839 840 smp_rmb(); 841 842 /* Match the version and minorversion */ 843 if (clp->rpc_ops->version != 4 || 844 clp->cl_minorversion != minorversion) 845 return false; 846 847 /* Match only the IP address, not the port number */ 848 return rpc_cmp_addr(addr, clap); 849 } 850 851 /* 852 * NFSv4.1 callback thread helper 853 * For CB_COMPOUND calls, find a client by IP address, protocol version, 854 * minorversion, and sessionID 855 * 856 * Returns NULL if no such client 857 */ 858 struct nfs_client * 859 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 860 struct nfs4_sessionid *sid, u32 minorversion) 861 { 862 struct nfs_client *clp; 863 struct nfs_net *nn = net_generic(net, nfs_net_id); 864 865 spin_lock(&nn->nfs_client_lock); 866 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 867 if (!nfs4_cb_match_client(addr, clp, minorversion)) 868 continue; 869 870 if (!nfs4_has_session(clp)) 871 continue; 872 873 /* Match sessionid*/ 874 if (memcmp(clp->cl_session->sess_id.data, 875 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 876 continue; 877 878 refcount_inc(&clp->cl_count); 879 spin_unlock(&nn->nfs_client_lock); 880 return clp; 881 } 882 spin_unlock(&nn->nfs_client_lock); 883 return NULL; 884 } 885 886 #else /* CONFIG_NFS_V4_1 */ 887 888 struct nfs_client * 889 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 890 struct nfs4_sessionid *sid, u32 minorversion) 891 { 892 return NULL; 893 } 894 #endif /* CONFIG_NFS_V4_1 */ 895 896 /* 897 * Set up an NFS4 client 898 */ 899 static int nfs4_set_client(struct nfs_server *server, 900 struct nfs_client_initdata *cl_init) 901 { 902 struct nfs_client *clp; 903 904 cl_init->nfs_mod = &nfs_v4; 905 cl_init->cred = server->cred; 906 907 if (cl_init->minorversion == 0) { 908 __set_bit(NFS_CS_REUSEPORT, &cl_init->init_flags); 909 cl_init->max_connect = 0; 910 } 911 912 switch (cl_init->proto) { 913 case XPRT_TRANSPORT_RDMA: 914 case XPRT_TRANSPORT_TCP: 915 case XPRT_TRANSPORT_TCP_TLS: 916 break; 917 default: 918 cl_init->nconnect = 0; 919 } 920 921 if (server->flags & NFS_MOUNT_NORESVPORT) 922 __set_bit(NFS_CS_NORESVPORT, &cl_init->init_flags); 923 if (server->options & NFS_OPTION_MIGRATION) 924 __set_bit(NFS_CS_MIGRATION, &cl_init->init_flags); 925 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 926 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init->init_flags); 927 server->port = rpc_get_port((struct sockaddr *)cl_init->addr); 928 929 if (server->flags & NFS_MOUNT_NETUNREACH_FATAL) 930 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init->init_flags); 931 932 /* Allocate or find a client reference we can use */ 933 clp = nfs_get_client(cl_init); 934 if (IS_ERR(clp)) 935 return PTR_ERR(clp); 936 937 if (server->nfs_client == clp) { 938 nfs_put_client(clp); 939 return -ELOOP; 940 } 941 942 /* 943 * Query for the lease time on clientid setup or renewal 944 * 945 * Note that this will be set on nfs_clients that were created 946 * only for the DS role and did not set this bit, but now will 947 * serve a dual role. 948 */ 949 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 950 951 server->nfs_client = clp; 952 nfs_sysfs_add_server(server); 953 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 954 955 return 0; 956 } 957 958 /* 959 * Set up a pNFS Data Server client. 960 * 961 * Return any existing nfs_client that matches server address,port,version 962 * and minorversion. 963 * 964 * For a new nfs_client, use a soft mount (default), a low retrans and a 965 * low timeout interval so that if a connection is lost, we retry through 966 * the MDS. 967 */ 968 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 969 const struct sockaddr_storage *ds_addr, int ds_addrlen, 970 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 971 u32 minor_version) 972 { 973 struct rpc_timeout ds_timeout; 974 struct nfs_client *mds_clp = mds_srv->nfs_client; 975 struct nfs_client_initdata cl_init = { 976 .addr = ds_addr, 977 .addrlen = ds_addrlen, 978 .nodename = mds_clp->cl_rpcclient->cl_nodename, 979 .ip_addr = mds_clp->cl_ipaddr, 980 .nfs_mod = &nfs_v4, 981 .proto = ds_proto, 982 .minorversion = minor_version, 983 .net = mds_clp->cl_net, 984 .timeparms = &ds_timeout, 985 .cred = mds_srv->cred, 986 .xprtsec = mds_srv->nfs_client->cl_xprtsec, 987 }; 988 char buf[INET6_ADDRSTRLEN + 1]; 989 990 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0) 991 return ERR_PTR(-EINVAL); 992 cl_init.hostname = buf; 993 994 switch (ds_proto) { 995 case XPRT_TRANSPORT_RDMA: 996 case XPRT_TRANSPORT_TCP: 997 case XPRT_TRANSPORT_TCP_TLS: 998 if (mds_clp->cl_nconnect > 1) { 999 cl_init.nconnect = mds_clp->cl_nconnect; 1000 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1001 } 1002 } 1003 1004 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 1005 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 1006 if (test_bit(NFS_CS_NETUNREACH_FATAL, &mds_clp->cl_flags)) 1007 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags); 1008 1009 __set_bit(NFS_CS_PNFS, &cl_init.init_flags); 1010 cl_init.max_connect = NFS_MAX_TRANSPORTS; 1011 /* 1012 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 1013 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 1014 * (section 13.1 RFC 5661). 1015 */ 1016 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 1017 return nfs_get_client(&cl_init); 1018 } 1019 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1020 1021 /* 1022 * Session has been established, and the client marked ready. 1023 * Limit the mount rsize, wsize and dtsize using negotiated fore 1024 * channel attributes. 1025 */ 1026 static void nfs4_session_limit_rwsize(struct nfs_server *server) 1027 { 1028 #ifdef CONFIG_NFS_V4_1 1029 struct nfs4_session *sess; 1030 u32 server_resp_sz; 1031 u32 server_rqst_sz; 1032 1033 if (!nfs4_has_session(server->nfs_client)) 1034 return; 1035 sess = server->nfs_client->cl_session; 1036 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1037 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1038 1039 if (server->dtsize > server_resp_sz) 1040 server->dtsize = server_resp_sz; 1041 if (server->rsize > server_resp_sz) 1042 server->rsize = server_resp_sz; 1043 if (server->wsize > server_rqst_sz) 1044 server->wsize = server_rqst_sz; 1045 #endif /* CONFIG_NFS_V4_1 */ 1046 } 1047 1048 /* 1049 * Limit xattr sizes using the channel attributes. 1050 */ 1051 static void nfs4_session_limit_xasize(struct nfs_server *server) 1052 { 1053 #ifdef CONFIG_NFS_V4_2 1054 struct nfs4_session *sess; 1055 u32 server_gxa_sz; 1056 u32 server_sxa_sz; 1057 u32 server_lxa_sz; 1058 1059 if (!nfs4_has_session(server->nfs_client)) 1060 return; 1061 1062 sess = server->nfs_client->cl_session; 1063 1064 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead; 1065 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead; 1066 server_lxa_sz = sess->fc_attrs.max_resp_sz - 1067 nfs42_maxlistxattrs_overhead; 1068 1069 if (server->gxasize > server_gxa_sz) 1070 server->gxasize = server_gxa_sz; 1071 if (server->sxasize > server_sxa_sz) 1072 server->sxasize = server_sxa_sz; 1073 if (server->lxasize > server_lxa_sz) 1074 server->lxasize = server_lxa_sz; 1075 #endif 1076 } 1077 1078 static int nfs4_server_common_setup(struct nfs_server *server, 1079 struct nfs_fh *mntfh, bool auth_probe) 1080 { 1081 int error; 1082 1083 error = nfs4_delegation_hash_alloc(server); 1084 if (error) 1085 return error; 1086 1087 /* data servers support only a subset of NFSv4.1 */ 1088 if (is_ds_only_client(server->nfs_client)) 1089 return -EPROTONOSUPPORT; 1090 1091 /* We must ensure the session is initialised first */ 1092 error = nfs4_init_session(server->nfs_client); 1093 if (error < 0) 1094 return error; 1095 1096 nfs_server_set_init_caps(server); 1097 1098 /* Probe the root fh to retrieve its FSID and filehandle */ 1099 error = nfs4_get_rootfh(server, mntfh, auth_probe); 1100 if (error < 0) 1101 return error; 1102 1103 dprintk("Server FSID: %llx:%llx\n", 1104 (unsigned long long) server->fsid.major, 1105 (unsigned long long) server->fsid.minor); 1106 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1107 1108 error = nfs_probe_server(server, mntfh); 1109 if (error < 0) 1110 return error; 1111 1112 nfs4_session_limit_rwsize(server); 1113 nfs4_session_limit_xasize(server); 1114 1115 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1116 server->namelen = NFS4_MAXNAMLEN; 1117 1118 nfs_server_insert_lists(server); 1119 server->mount_time = jiffies; 1120 server->destroy = nfs4_destroy_server; 1121 return 0; 1122 } 1123 1124 /* 1125 * Create a version 4 volume record 1126 */ 1127 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc) 1128 { 1129 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1130 struct rpc_timeout timeparms; 1131 struct nfs_client_initdata cl_init = { 1132 .hostname = ctx->nfs_server.hostname, 1133 .addr = &ctx->nfs_server._address, 1134 .addrlen = ctx->nfs_server.addrlen, 1135 .ip_addr = ctx->client_address, 1136 .proto = ctx->nfs_server.protocol, 1137 .minorversion = ctx->minorversion, 1138 .net = fc->net_ns, 1139 .timeparms = &timeparms, 1140 .xprtsec = ctx->xprtsec, 1141 .nconnect = ctx->nfs_server.nconnect, 1142 .max_connect = ctx->nfs_server.max_connect, 1143 }; 1144 int error; 1145 1146 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 1147 ctx->timeo, ctx->retrans); 1148 1149 /* Initialise the client representation from the mount data */ 1150 server->flags = ctx->flags; 1151 server->options = ctx->options; 1152 server->auth_info = ctx->auth_info; 1153 1154 /* Use the first specified auth flavor. If this flavor isn't 1155 * allowed by the server, use the SECINFO path to try the 1156 * other specified flavors */ 1157 if (ctx->auth_info.flavor_len >= 1) 1158 ctx->selected_flavor = ctx->auth_info.flavors[0]; 1159 else 1160 ctx->selected_flavor = RPC_AUTH_UNIX; 1161 1162 /* Get a client record */ 1163 error = nfs4_set_client(server, &cl_init); 1164 if (error < 0) 1165 return error; 1166 1167 if (ctx->rsize) 1168 server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto); 1169 if (ctx->wsize) 1170 server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto); 1171 1172 server->acregmin = ctx->acregmin * HZ; 1173 server->acregmax = ctx->acregmax * HZ; 1174 server->acdirmin = ctx->acdirmin * HZ; 1175 server->acdirmax = ctx->acdirmax * HZ; 1176 server->port = ctx->nfs_server.port; 1177 1178 return nfs_init_server_rpcclient(server, &timeparms, 1179 ctx->selected_flavor); 1180 } 1181 1182 /* 1183 * Create a version 4 volume record 1184 * - keyed on server and FSID 1185 */ 1186 struct nfs_server *nfs4_create_server(struct fs_context *fc) 1187 { 1188 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1189 struct nfs_server *server; 1190 bool auth_probe; 1191 int error; 1192 1193 server = nfs_alloc_server(); 1194 if (!server) 1195 return ERR_PTR(-ENOMEM); 1196 1197 server->cred = get_cred(fc->cred); 1198 1199 auth_probe = ctx->auth_info.flavor_len < 1; 1200 1201 /* set up the general RPC client */ 1202 error = nfs4_init_server(server, fc); 1203 if (error < 0) 1204 goto error; 1205 1206 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1207 if (error < 0) 1208 goto error; 1209 1210 return server; 1211 1212 error: 1213 nfs_free_server(server); 1214 return ERR_PTR(error); 1215 } 1216 1217 /* 1218 * Create an NFS4 referral server record 1219 */ 1220 struct nfs_server *nfs4_create_referral_server(struct fs_context *fc) 1221 { 1222 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1223 struct nfs_server *parent_server = NFS_SB(ctx->clone_data.sb); 1224 struct nfs_client *parent_client = parent_server->nfs_client; 1225 struct nfs_client_initdata cl_init = { 1226 .hostname = ctx->nfs_server.hostname, 1227 .addr = &ctx->nfs_server._address, 1228 .addrlen = ctx->nfs_server.addrlen, 1229 .ip_addr = parent_client->cl_ipaddr, 1230 .minorversion = parent_client->cl_mvops->minor_version, 1231 .net = parent_client->cl_net, 1232 .timeparms = parent_server->client->cl_timeout, 1233 .xprtsec = parent_client->cl_xprtsec, 1234 .nconnect = parent_client->cl_nconnect, 1235 .max_connect = parent_client->cl_max_connect, 1236 }; 1237 struct nfs_server *server; 1238 bool auth_probe; 1239 int error; 1240 1241 server = nfs_alloc_server(); 1242 if (!server) 1243 return ERR_PTR(-ENOMEM); 1244 1245 server->cred = get_cred(parent_server->cred); 1246 1247 /* Initialise the client representation from the parent server */ 1248 nfs_server_copy_userdata(server, parent_server); 1249 1250 /* Get a client representation */ 1251 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1252 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT); 1253 cl_init.proto = XPRT_TRANSPORT_RDMA; 1254 error = nfs4_set_client(server, &cl_init); 1255 if (!error) 1256 goto init_server; 1257 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ 1258 1259 cl_init.proto = XPRT_TRANSPORT_TCP; 1260 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) 1261 cl_init.proto = XPRT_TRANSPORT_TCP_TLS; 1262 rpc_set_port(&ctx->nfs_server.address, NFS_PORT); 1263 error = nfs4_set_client(server, &cl_init); 1264 if (error < 0) 1265 goto error; 1266 1267 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1268 init_server: 1269 #endif 1270 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, 1271 ctx->selected_flavor); 1272 if (error < 0) 1273 goto error; 1274 1275 auth_probe = parent_server->auth_info.flavor_len < 1; 1276 1277 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1278 if (error < 0) 1279 goto error; 1280 1281 return server; 1282 1283 error: 1284 nfs_free_server(server); 1285 return ERR_PTR(error); 1286 } 1287 1288 /** 1289 * nfs4_update_server - Move an nfs_server to a different nfs_client 1290 * 1291 * @server: represents FSID to be moved 1292 * @hostname: new end-point's hostname 1293 * @sap: new end-point's socket address 1294 * @salen: size of "sap" 1295 * @net: net namespace 1296 * 1297 * The nfs_server must be quiescent before this function is invoked. 1298 * Either its session is drained (NFSv4.1+), or its transport is 1299 * plugged and drained (NFSv4.0). 1300 * 1301 * Returns zero on success, or a negative errno value. 1302 */ 1303 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1304 struct sockaddr_storage *sap, size_t salen, struct net *net) 1305 { 1306 struct nfs_client *clp = server->nfs_client; 1307 struct rpc_clnt *clnt = server->client; 1308 struct xprt_create xargs = { 1309 .ident = clp->cl_proto, 1310 .net = net, 1311 .dstaddr = (struct sockaddr *)sap, 1312 .addrlen = salen, 1313 .servername = hostname, 1314 /* cel: bleh. We might need to pass TLS parameters here */ 1315 }; 1316 char buf[INET6_ADDRSTRLEN + 1]; 1317 struct sockaddr_storage address; 1318 struct sockaddr *localaddr = (struct sockaddr *)&address; 1319 struct nfs_client_initdata cl_init = { 1320 .hostname = hostname, 1321 .addr = sap, 1322 .addrlen = salen, 1323 .ip_addr = buf, 1324 .proto = clp->cl_proto, 1325 .minorversion = clp->cl_minorversion, 1326 .net = net, 1327 .timeparms = clnt->cl_timeout, 1328 .xprtsec = clp->cl_xprtsec, 1329 .nconnect = clp->cl_nconnect, 1330 .max_connect = clp->cl_max_connect, 1331 }; 1332 int error; 1333 1334 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1335 if (error != 0) 1336 return error; 1337 1338 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1339 if (error != 0) 1340 return error; 1341 1342 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1343 return -EAFNOSUPPORT; 1344 1345 nfs_server_remove_lists(server); 1346 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1347 error = nfs4_set_client(server, &cl_init); 1348 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1349 if (error != 0) { 1350 nfs_server_insert_lists(server); 1351 return error; 1352 } 1353 nfs_put_client(clp); 1354 1355 if (server->nfs_client->cl_hostname == NULL) { 1356 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1357 if (server->nfs_client->cl_hostname == NULL) 1358 return -ENOMEM; 1359 } 1360 nfs_server_insert_lists(server); 1361 1362 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root))); 1363 } 1364