1 /* 2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 3 * Written by David Howells (dhowells@redhat.com) 4 */ 5 #include <linux/module.h> 6 #include <linux/nfs_fs.h> 7 #include <linux/nfs_mount.h> 8 #include <linux/sunrpc/addr.h> 9 #include <linux/sunrpc/auth.h> 10 #include <linux/sunrpc/xprt.h> 11 #include <linux/sunrpc/bc_xprt.h> 12 #include <linux/sunrpc/rpc_pipe_fs.h> 13 #include "internal.h" 14 #include "callback.h" 15 #include "delegation.h" 16 #include "nfs4session.h" 17 #include "nfs4idmap.h" 18 #include "pnfs.h" 19 #include "netns.h" 20 21 #define NFSDBG_FACILITY NFSDBG_CLIENT 22 23 /* 24 * Get a unique NFSv4.0 callback identifier which will be used 25 * by the V4.0 callback service to lookup the nfs_client struct 26 */ 27 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 28 { 29 int ret = 0; 30 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 31 32 if (clp->rpc_ops->version != 4 || minorversion != 0) 33 return ret; 34 idr_preload(GFP_KERNEL); 35 spin_lock(&nn->nfs_client_lock); 36 ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT); 37 if (ret >= 0) 38 clp->cl_cb_ident = ret; 39 spin_unlock(&nn->nfs_client_lock); 40 idr_preload_end(); 41 return ret < 0 ? ret : 0; 42 } 43 44 #ifdef CONFIG_NFS_V4_1 45 /** 46 * Per auth flavor data server rpc clients 47 */ 48 struct nfs4_ds_server { 49 struct list_head list; /* ds_clp->cl_ds_clients */ 50 struct rpc_clnt *rpc_clnt; 51 }; 52 53 /** 54 * Common lookup case for DS I/O 55 */ 56 static struct nfs4_ds_server * 57 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 58 { 59 struct nfs4_ds_server *dss; 60 61 rcu_read_lock(); 62 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { 63 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 64 continue; 65 goto out; 66 } 67 dss = NULL; 68 out: 69 rcu_read_unlock(); 70 return dss; 71 } 72 73 static struct nfs4_ds_server * 74 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, 75 struct nfs4_ds_server *new) 76 { 77 struct nfs4_ds_server *dss; 78 79 spin_lock(&ds_clp->cl_lock); 80 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { 81 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 82 continue; 83 goto out; 84 } 85 if (new) 86 list_add_rcu(&new->list, &ds_clp->cl_ds_clients); 87 dss = new; 88 out: 89 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 90 return dss; 91 } 92 93 static struct nfs4_ds_server * 94 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 95 { 96 struct nfs4_ds_server *dss; 97 98 dss = kmalloc(sizeof(*dss), GFP_NOFS); 99 if (dss == NULL) 100 return ERR_PTR(-ENOMEM); 101 102 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); 103 if (IS_ERR(dss->rpc_clnt)) { 104 int err = PTR_ERR(dss->rpc_clnt); 105 kfree (dss); 106 return ERR_PTR(err); 107 } 108 INIT_LIST_HEAD(&dss->list); 109 110 return dss; 111 } 112 113 static void 114 nfs4_free_ds_server(struct nfs4_ds_server *dss) 115 { 116 rpc_release_client(dss->rpc_clnt); 117 kfree(dss); 118 } 119 120 /** 121 * Find or create a DS rpc client with th MDS server rpc client auth flavor 122 * in the nfs_client cl_ds_clients list. 123 */ 124 struct rpc_clnt * 125 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) 126 { 127 struct nfs4_ds_server *dss, *new; 128 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; 129 130 dss = nfs4_find_ds_client(ds_clp, flavor); 131 if (dss != NULL) 132 goto out; 133 new = nfs4_alloc_ds_server(ds_clp, flavor); 134 if (IS_ERR(new)) 135 return ERR_CAST(new); 136 dss = nfs4_add_ds_client(ds_clp, flavor, new); 137 if (dss != new) 138 nfs4_free_ds_server(new); 139 out: 140 return dss->rpc_clnt; 141 } 142 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 143 144 static void 145 nfs4_shutdown_ds_clients(struct nfs_client *clp) 146 { 147 struct nfs4_ds_server *dss; 148 LIST_HEAD(shutdown_list); 149 150 while (!list_empty(&clp->cl_ds_clients)) { 151 dss = list_entry(clp->cl_ds_clients.next, 152 struct nfs4_ds_server, list); 153 list_del(&dss->list); 154 rpc_shutdown_client(dss->rpc_clnt); 155 kfree (dss); 156 } 157 } 158 159 void nfs41_shutdown_client(struct nfs_client *clp) 160 { 161 if (nfs4_has_session(clp)) { 162 nfs4_shutdown_ds_clients(clp); 163 nfs4_destroy_session(clp->cl_session); 164 nfs4_destroy_clientid(clp); 165 } 166 167 } 168 #endif /* CONFIG_NFS_V4_1 */ 169 170 void nfs40_shutdown_client(struct nfs_client *clp) 171 { 172 if (clp->cl_slot_tbl) { 173 nfs4_shutdown_slot_table(clp->cl_slot_tbl); 174 kfree(clp->cl_slot_tbl); 175 } 176 } 177 178 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 179 { 180 int err; 181 struct nfs_client *clp = nfs_alloc_client(cl_init); 182 if (IS_ERR(clp)) 183 return clp; 184 185 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 186 if (err) 187 goto error; 188 189 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { 190 err = -EINVAL; 191 goto error; 192 } 193 194 spin_lock_init(&clp->cl_lock); 195 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 196 INIT_LIST_HEAD(&clp->cl_ds_clients); 197 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 198 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 199 clp->cl_minorversion = cl_init->minorversion; 200 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 201 clp->cl_mig_gen = 1; 202 return clp; 203 204 error: 205 nfs_free_client(clp); 206 return ERR_PTR(err); 207 } 208 209 /* 210 * Destroy the NFS4 callback service 211 */ 212 static void nfs4_destroy_callback(struct nfs_client *clp) 213 { 214 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 215 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 216 } 217 218 static void nfs4_shutdown_client(struct nfs_client *clp) 219 { 220 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 221 nfs4_kill_renewd(clp); 222 clp->cl_mvops->shutdown_client(clp); 223 nfs4_destroy_callback(clp); 224 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 225 nfs_idmap_delete(clp); 226 227 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 228 kfree(clp->cl_serverowner); 229 kfree(clp->cl_serverscope); 230 kfree(clp->cl_implid); 231 kfree(clp->cl_owner_id); 232 } 233 234 void nfs4_free_client(struct nfs_client *clp) 235 { 236 nfs4_shutdown_client(clp); 237 nfs_free_client(clp); 238 } 239 240 /* 241 * Initialize the NFS4 callback service 242 */ 243 static int nfs4_init_callback(struct nfs_client *clp) 244 { 245 struct rpc_xprt *xprt; 246 int error; 247 248 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 249 250 if (nfs4_has_session(clp)) { 251 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 252 if (error < 0) 253 return error; 254 } 255 256 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 257 if (error < 0) { 258 dprintk("%s: failed to start callback. Error = %d\n", 259 __func__, error); 260 return error; 261 } 262 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 263 264 return 0; 265 } 266 267 /** 268 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 269 * @clp - nfs_client to initialize 270 * 271 * Returns zero on success, or a negative errno if some error occurred. 272 */ 273 int nfs40_init_client(struct nfs_client *clp) 274 { 275 struct nfs4_slot_table *tbl; 276 int ret; 277 278 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 279 if (tbl == NULL) 280 return -ENOMEM; 281 282 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 283 "NFSv4.0 transport Slot table"); 284 if (ret) { 285 kfree(tbl); 286 return ret; 287 } 288 289 clp->cl_slot_tbl = tbl; 290 return 0; 291 } 292 293 #if defined(CONFIG_NFS_V4_1) 294 295 /** 296 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 297 * @clp - nfs_client to initialize 298 * 299 * Returns zero on success, or a negative errno if some error occurred. 300 */ 301 int nfs41_init_client(struct nfs_client *clp) 302 { 303 struct nfs4_session *session = NULL; 304 305 /* 306 * Create the session and mark it expired. 307 * When a SEQUENCE operation encounters the expired session 308 * it will do session recovery to initialize it. 309 */ 310 session = nfs4_alloc_session(clp); 311 if (!session) 312 return -ENOMEM; 313 314 clp->cl_session = session; 315 316 /* 317 * The create session reply races with the server back 318 * channel probe. Mark the client NFS_CS_SESSION_INITING 319 * so that the client back channel can find the 320 * nfs_client struct 321 */ 322 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 323 return 0; 324 } 325 326 #endif /* CONFIG_NFS_V4_1 */ 327 328 /* 329 * Initialize the minor version specific parts of an NFS4 client record 330 */ 331 static int nfs4_init_client_minor_version(struct nfs_client *clp) 332 { 333 int ret; 334 335 ret = clp->cl_mvops->init_client(clp); 336 if (ret) 337 return ret; 338 return nfs4_init_callback(clp); 339 } 340 341 /** 342 * nfs4_init_client - Initialise an NFS4 client record 343 * 344 * @clp: nfs_client to initialise 345 * @timeparms: timeout parameters for underlying RPC transport 346 * @ip_addr: callback IP address in presentation format 347 * @authflavor: authentication flavor for underlying RPC transport 348 * 349 * Returns pointer to an NFS client, or an ERR_PTR value. 350 */ 351 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 352 const struct rpc_timeout *timeparms, 353 const char *ip_addr) 354 { 355 char buf[INET6_ADDRSTRLEN + 1]; 356 struct nfs_client *old; 357 int error; 358 359 if (clp->cl_cons_state == NFS_CS_READY) { 360 /* the client is initialised already */ 361 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 362 return clp; 363 } 364 365 /* Check NFS protocol revision and initialize RPC op vector */ 366 clp->rpc_ops = &nfs_v4_clientops; 367 368 if (clp->cl_minorversion != 0) 369 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 370 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 371 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 372 373 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I); 374 if (error == -EINVAL) 375 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 376 if (error < 0) 377 goto error; 378 379 /* If no clientaddr= option was specified, find a usable cb address */ 380 if (ip_addr == NULL) { 381 struct sockaddr_storage cb_addr; 382 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 383 384 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 385 if (error < 0) 386 goto error; 387 error = rpc_ntop(sap, buf, sizeof(buf)); 388 if (error < 0) 389 goto error; 390 ip_addr = (const char *)buf; 391 } 392 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 393 394 error = nfs_idmap_new(clp); 395 if (error < 0) { 396 dprintk("%s: failed to create idmapper. Error = %d\n", 397 __func__, error); 398 goto error; 399 } 400 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 401 402 error = nfs4_init_client_minor_version(clp); 403 if (error < 0) 404 goto error; 405 406 if (!nfs4_has_session(clp)) 407 nfs_mark_client_ready(clp, NFS_CS_READY); 408 409 error = nfs4_discover_server_trunking(clp, &old); 410 if (error < 0) 411 goto error; 412 413 if (clp != old) 414 clp->cl_preserve_clid = true; 415 nfs_put_client(clp); 416 return old; 417 418 error: 419 nfs_mark_client_ready(clp, error); 420 nfs_put_client(clp); 421 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 422 return ERR_PTR(error); 423 } 424 425 /* 426 * SETCLIENTID just did a callback update with the callback ident in 427 * "drop," but server trunking discovery claims "drop" and "keep" are 428 * actually the same server. Swap the callback IDs so that "keep" 429 * will continue to use the callback ident the server now knows about, 430 * and so that "keep"'s original callback ident is destroyed when 431 * "drop" is freed. 432 */ 433 static void nfs4_swap_callback_idents(struct nfs_client *keep, 434 struct nfs_client *drop) 435 { 436 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 437 unsigned int save = keep->cl_cb_ident; 438 439 if (keep->cl_cb_ident == drop->cl_cb_ident) 440 return; 441 442 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 443 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 444 445 spin_lock(&nn->nfs_client_lock); 446 447 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 448 keep->cl_cb_ident = drop->cl_cb_ident; 449 450 idr_replace(&nn->cb_ident_idr, drop, save); 451 drop->cl_cb_ident = save; 452 453 spin_unlock(&nn->nfs_client_lock); 454 } 455 456 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 457 const struct nfs_client *clp2) 458 { 459 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 460 return true; 461 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 462 } 463 464 /** 465 * nfs40_walk_client_list - Find server that recognizes a client ID 466 * 467 * @new: nfs_client with client ID to test 468 * @result: OUT: found nfs_client, or new 469 * @cred: credential to use for trunking test 470 * 471 * Returns zero, a negative errno, or a negative NFS4ERR status. 472 * If zero is returned, an nfs_client pointer is planted in "result." 473 * 474 * NB: nfs40_walk_client_list() relies on the new nfs_client being 475 * the last nfs_client on the list. 476 */ 477 int nfs40_walk_client_list(struct nfs_client *new, 478 struct nfs_client **result, 479 struct rpc_cred *cred) 480 { 481 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 482 struct nfs_client *pos, *prev = NULL; 483 struct nfs4_setclientid_res clid = { 484 .clientid = new->cl_clientid, 485 .confirm = new->cl_confirm, 486 }; 487 int status = -NFS4ERR_STALE_CLIENTID; 488 489 spin_lock(&nn->nfs_client_lock); 490 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 491 492 if (pos->rpc_ops != new->rpc_ops) 493 continue; 494 495 if (pos->cl_minorversion != new->cl_minorversion) 496 continue; 497 498 /* If "pos" isn't marked ready, we can't trust the 499 * remaining fields in "pos" */ 500 if (pos->cl_cons_state > NFS_CS_READY) { 501 atomic_inc(&pos->cl_count); 502 spin_unlock(&nn->nfs_client_lock); 503 504 nfs_put_client(prev); 505 prev = pos; 506 507 status = nfs_wait_client_init_complete(pos); 508 if (status < 0) 509 goto out; 510 status = -NFS4ERR_STALE_CLIENTID; 511 spin_lock(&nn->nfs_client_lock); 512 } 513 if (pos->cl_cons_state != NFS_CS_READY) 514 continue; 515 516 if (pos->cl_clientid != new->cl_clientid) 517 continue; 518 519 if (!nfs4_match_client_owner_id(pos, new)) 520 continue; 521 522 atomic_inc(&pos->cl_count); 523 spin_unlock(&nn->nfs_client_lock); 524 525 nfs_put_client(prev); 526 prev = pos; 527 528 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 529 switch (status) { 530 case -NFS4ERR_STALE_CLIENTID: 531 break; 532 case 0: 533 nfs4_swap_callback_idents(pos, new); 534 535 prev = NULL; 536 *result = pos; 537 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 538 __func__, pos, atomic_read(&pos->cl_count)); 539 goto out; 540 case -ERESTARTSYS: 541 case -ETIMEDOUT: 542 /* The callback path may have been inadvertently 543 * changed. Schedule recovery! 544 */ 545 nfs4_schedule_path_down_recovery(pos); 546 default: 547 goto out; 548 } 549 550 spin_lock(&nn->nfs_client_lock); 551 } 552 spin_unlock(&nn->nfs_client_lock); 553 554 /* No match found. The server lost our clientid */ 555 out: 556 nfs_put_client(prev); 557 dprintk("NFS: <-- %s status = %d\n", __func__, status); 558 return status; 559 } 560 561 #ifdef CONFIG_NFS_V4_1 562 /* 563 * Returns true if the client IDs match 564 */ 565 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b) 566 { 567 if (a->cl_clientid != b->cl_clientid) { 568 dprintk("NFS: --> %s client ID %llx does not match %llx\n", 569 __func__, a->cl_clientid, b->cl_clientid); 570 return false; 571 } 572 dprintk("NFS: --> %s client ID %llx matches %llx\n", 573 __func__, a->cl_clientid, b->cl_clientid); 574 return true; 575 } 576 577 /* 578 * Returns true if the server major ids match 579 */ 580 static bool 581 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b) 582 { 583 struct nfs41_server_owner *o1 = a->cl_serverowner; 584 struct nfs41_server_owner *o2 = b->cl_serverowner; 585 586 if (o1->major_id_sz != o2->major_id_sz) 587 goto out_major_mismatch; 588 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0) 589 goto out_major_mismatch; 590 591 dprintk("NFS: --> %s server owners match\n", __func__); 592 return true; 593 594 out_major_mismatch: 595 dprintk("NFS: --> %s server owner major IDs do not match\n", 596 __func__); 597 return false; 598 } 599 600 /** 601 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 602 * 603 * @new: nfs_client with client ID to test 604 * @result: OUT: found nfs_client, or new 605 * @cred: credential to use for trunking test 606 * 607 * Returns zero, a negative errno, or a negative NFS4ERR status. 608 * If zero is returned, an nfs_client pointer is planted in "result." 609 * 610 * NB: nfs41_walk_client_list() relies on the new nfs_client being 611 * the last nfs_client on the list. 612 */ 613 int nfs41_walk_client_list(struct nfs_client *new, 614 struct nfs_client **result, 615 struct rpc_cred *cred) 616 { 617 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 618 struct nfs_client *pos, *prev = NULL; 619 int status = -NFS4ERR_STALE_CLIENTID; 620 621 spin_lock(&nn->nfs_client_lock); 622 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 623 624 if (pos == new) 625 goto found; 626 627 if (pos->rpc_ops != new->rpc_ops) 628 continue; 629 630 if (pos->cl_minorversion != new->cl_minorversion) 631 continue; 632 633 /* If "pos" isn't marked ready, we can't trust the 634 * remaining fields in "pos", especially the client 635 * ID and serverowner fields. Wait for CREATE_SESSION 636 * to finish. */ 637 if (pos->cl_cons_state > NFS_CS_READY) { 638 atomic_inc(&pos->cl_count); 639 spin_unlock(&nn->nfs_client_lock); 640 641 nfs_put_client(prev); 642 prev = pos; 643 644 status = nfs_wait_client_init_complete(pos); 645 spin_lock(&nn->nfs_client_lock); 646 if (status < 0) 647 break; 648 status = -NFS4ERR_STALE_CLIENTID; 649 } 650 if (pos->cl_cons_state != NFS_CS_READY) 651 continue; 652 653 if (!nfs4_match_clientids(pos, new)) 654 continue; 655 656 /* 657 * Note that session trunking is just a special subcase of 658 * client id trunking. In either case, we want to fall back 659 * to using the existing nfs_client. 660 */ 661 if (!nfs4_check_clientid_trunking(pos, new)) 662 continue; 663 664 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the 665 * uniform string, however someone might switch the 666 * uniquifier string on us. 667 */ 668 if (!nfs4_match_client_owner_id(pos, new)) 669 continue; 670 found: 671 atomic_inc(&pos->cl_count); 672 *result = pos; 673 status = 0; 674 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 675 __func__, pos, atomic_read(&pos->cl_count)); 676 break; 677 } 678 679 spin_unlock(&nn->nfs_client_lock); 680 dprintk("NFS: <-- %s status = %d\n", __func__, status); 681 nfs_put_client(prev); 682 return status; 683 } 684 #endif /* CONFIG_NFS_V4_1 */ 685 686 static void nfs4_destroy_server(struct nfs_server *server) 687 { 688 nfs_server_return_all_delegations(server); 689 unset_pnfs_layoutdriver(server); 690 nfs4_purge_state_owners(server); 691 } 692 693 /* 694 * NFSv4.0 callback thread helper 695 * 696 * Find a client by callback identifier 697 */ 698 struct nfs_client * 699 nfs4_find_client_ident(struct net *net, int cb_ident) 700 { 701 struct nfs_client *clp; 702 struct nfs_net *nn = net_generic(net, nfs_net_id); 703 704 spin_lock(&nn->nfs_client_lock); 705 clp = idr_find(&nn->cb_ident_idr, cb_ident); 706 if (clp) 707 atomic_inc(&clp->cl_count); 708 spin_unlock(&nn->nfs_client_lock); 709 return clp; 710 } 711 712 #if defined(CONFIG_NFS_V4_1) 713 /* Common match routine for v4.0 and v4.1 callback services */ 714 static bool nfs4_cb_match_client(const struct sockaddr *addr, 715 struct nfs_client *clp, u32 minorversion) 716 { 717 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 718 719 /* Don't match clients that failed to initialise */ 720 if (!(clp->cl_cons_state == NFS_CS_READY || 721 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 722 return false; 723 724 smp_rmb(); 725 726 /* Match the version and minorversion */ 727 if (clp->rpc_ops->version != 4 || 728 clp->cl_minorversion != minorversion) 729 return false; 730 731 /* Match only the IP address, not the port number */ 732 return rpc_cmp_addr(addr, clap); 733 } 734 735 /* 736 * NFSv4.1 callback thread helper 737 * For CB_COMPOUND calls, find a client by IP address, protocol version, 738 * minorversion, and sessionID 739 * 740 * Returns NULL if no such client 741 */ 742 struct nfs_client * 743 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 744 struct nfs4_sessionid *sid, u32 minorversion) 745 { 746 struct nfs_client *clp; 747 struct nfs_net *nn = net_generic(net, nfs_net_id); 748 749 spin_lock(&nn->nfs_client_lock); 750 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 751 if (nfs4_cb_match_client(addr, clp, minorversion) == false) 752 continue; 753 754 if (!nfs4_has_session(clp)) 755 continue; 756 757 /* Match sessionid*/ 758 if (memcmp(clp->cl_session->sess_id.data, 759 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 760 continue; 761 762 atomic_inc(&clp->cl_count); 763 spin_unlock(&nn->nfs_client_lock); 764 return clp; 765 } 766 spin_unlock(&nn->nfs_client_lock); 767 return NULL; 768 } 769 770 #else /* CONFIG_NFS_V4_1 */ 771 772 struct nfs_client * 773 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 774 struct nfs4_sessionid *sid, u32 minorversion) 775 { 776 return NULL; 777 } 778 #endif /* CONFIG_NFS_V4_1 */ 779 780 /* 781 * Set up an NFS4 client 782 */ 783 static int nfs4_set_client(struct nfs_server *server, 784 const char *hostname, 785 const struct sockaddr *addr, 786 const size_t addrlen, 787 const char *ip_addr, 788 rpc_authflavor_t authflavour, 789 int proto, const struct rpc_timeout *timeparms, 790 u32 minorversion, struct net *net) 791 { 792 struct nfs_client_initdata cl_init = { 793 .hostname = hostname, 794 .addr = addr, 795 .addrlen = addrlen, 796 .nfs_mod = &nfs_v4, 797 .proto = proto, 798 .minorversion = minorversion, 799 .net = net, 800 }; 801 struct nfs_client *clp; 802 int error; 803 804 dprintk("--> nfs4_set_client()\n"); 805 806 if (server->flags & NFS_MOUNT_NORESVPORT) 807 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 808 if (server->options & NFS_OPTION_MIGRATION) 809 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 810 811 /* Allocate or find a client reference we can use */ 812 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour); 813 if (IS_ERR(clp)) { 814 error = PTR_ERR(clp); 815 goto error; 816 } 817 818 /* 819 * Query for the lease time on clientid setup or renewal 820 * 821 * Note that this will be set on nfs_clients that were created 822 * only for the DS role and did not set this bit, but now will 823 * serve a dual role. 824 */ 825 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 826 827 server->nfs_client = clp; 828 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 829 return 0; 830 error: 831 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 832 return error; 833 } 834 835 /* 836 * Set up a pNFS Data Server client. 837 * 838 * Return any existing nfs_client that matches server address,port,version 839 * and minorversion. 840 * 841 * For a new nfs_client, use a soft mount (default), a low retrans and a 842 * low timeout interval so that if a connection is lost, we retry through 843 * the MDS. 844 */ 845 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 846 const struct sockaddr *ds_addr, int ds_addrlen, 847 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 848 u32 minor_version, rpc_authflavor_t au_flavor) 849 { 850 struct nfs_client_initdata cl_init = { 851 .addr = ds_addr, 852 .addrlen = ds_addrlen, 853 .nfs_mod = &nfs_v4, 854 .proto = ds_proto, 855 .minorversion = minor_version, 856 .net = mds_clp->cl_net, 857 }; 858 struct rpc_timeout ds_timeout; 859 struct nfs_client *clp; 860 char buf[INET6_ADDRSTRLEN + 1]; 861 862 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 863 return ERR_PTR(-EINVAL); 864 cl_init.hostname = buf; 865 866 /* 867 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 868 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 869 * (section 13.1 RFC 5661). 870 */ 871 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 872 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 873 au_flavor); 874 875 dprintk("<-- %s %p\n", __func__, clp); 876 return clp; 877 } 878 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 879 880 /* 881 * Session has been established, and the client marked ready. 882 * Set the mount rsize and wsize with negotiated fore channel 883 * attributes which will be bound checked in nfs_server_set_fsinfo. 884 */ 885 static void nfs4_session_set_rwsize(struct nfs_server *server) 886 { 887 #ifdef CONFIG_NFS_V4_1 888 struct nfs4_session *sess; 889 u32 server_resp_sz; 890 u32 server_rqst_sz; 891 892 if (!nfs4_has_session(server->nfs_client)) 893 return; 894 sess = server->nfs_client->cl_session; 895 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 896 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 897 898 if (server->rsize > server_resp_sz) 899 server->rsize = server_resp_sz; 900 if (server->wsize > server_rqst_sz) 901 server->wsize = server_rqst_sz; 902 #endif /* CONFIG_NFS_V4_1 */ 903 } 904 905 static int nfs4_server_common_setup(struct nfs_server *server, 906 struct nfs_fh *mntfh, bool auth_probe) 907 { 908 struct nfs_fattr *fattr; 909 int error; 910 911 /* data servers support only a subset of NFSv4.1 */ 912 if (is_ds_only_client(server->nfs_client)) 913 return -EPROTONOSUPPORT; 914 915 fattr = nfs_alloc_fattr(); 916 if (fattr == NULL) 917 return -ENOMEM; 918 919 /* We must ensure the session is initialised first */ 920 error = nfs4_init_session(server->nfs_client); 921 if (error < 0) 922 goto out; 923 924 /* Set the basic capabilities */ 925 server->caps |= server->nfs_client->cl_mvops->init_caps; 926 if (server->flags & NFS_MOUNT_NORDIRPLUS) 927 server->caps &= ~NFS_CAP_READDIRPLUS; 928 /* 929 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 930 * authentication. 931 */ 932 if (nfs4_disable_idmapping && 933 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 934 server->caps |= NFS_CAP_UIDGID_NOMAP; 935 936 937 /* Probe the root fh to retrieve its FSID and filehandle */ 938 error = nfs4_get_rootfh(server, mntfh, auth_probe); 939 if (error < 0) 940 goto out; 941 942 dprintk("Server FSID: %llx:%llx\n", 943 (unsigned long long) server->fsid.major, 944 (unsigned long long) server->fsid.minor); 945 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 946 947 nfs4_session_set_rwsize(server); 948 949 error = nfs_probe_fsinfo(server, mntfh, fattr); 950 if (error < 0) 951 goto out; 952 953 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 954 server->namelen = NFS4_MAXNAMLEN; 955 956 nfs_server_insert_lists(server); 957 server->mount_time = jiffies; 958 server->destroy = nfs4_destroy_server; 959 out: 960 nfs_free_fattr(fattr); 961 return error; 962 } 963 964 /* 965 * Create a version 4 volume record 966 */ 967 static int nfs4_init_server(struct nfs_server *server, 968 struct nfs_parsed_mount_data *data) 969 { 970 struct rpc_timeout timeparms; 971 int error; 972 973 dprintk("--> nfs4_init_server()\n"); 974 975 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 976 data->timeo, data->retrans); 977 978 /* Initialise the client representation from the mount data */ 979 server->flags = data->flags; 980 server->options = data->options; 981 server->auth_info = data->auth_info; 982 983 /* Use the first specified auth flavor. If this flavor isn't 984 * allowed by the server, use the SECINFO path to try the 985 * other specified flavors */ 986 if (data->auth_info.flavor_len >= 1) 987 data->selected_flavor = data->auth_info.flavors[0]; 988 else 989 data->selected_flavor = RPC_AUTH_UNIX; 990 991 /* Get a client record */ 992 error = nfs4_set_client(server, 993 data->nfs_server.hostname, 994 (const struct sockaddr *)&data->nfs_server.address, 995 data->nfs_server.addrlen, 996 data->client_address, 997 data->selected_flavor, 998 data->nfs_server.protocol, 999 &timeparms, 1000 data->minorversion, 1001 data->net); 1002 if (error < 0) 1003 goto error; 1004 1005 if (data->rsize) 1006 server->rsize = nfs_block_size(data->rsize, NULL); 1007 if (data->wsize) 1008 server->wsize = nfs_block_size(data->wsize, NULL); 1009 1010 server->acregmin = data->acregmin * HZ; 1011 server->acregmax = data->acregmax * HZ; 1012 server->acdirmin = data->acdirmin * HZ; 1013 server->acdirmax = data->acdirmax * HZ; 1014 1015 server->port = data->nfs_server.port; 1016 1017 error = nfs_init_server_rpcclient(server, &timeparms, 1018 data->selected_flavor); 1019 1020 error: 1021 /* Done */ 1022 dprintk("<-- nfs4_init_server() = %d\n", error); 1023 return error; 1024 } 1025 1026 /* 1027 * Create a version 4 volume record 1028 * - keyed on server and FSID 1029 */ 1030 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1031 struct nfs_fh *mntfh)*/ 1032 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1033 struct nfs_subversion *nfs_mod) 1034 { 1035 struct nfs_server *server; 1036 bool auth_probe; 1037 int error; 1038 1039 dprintk("--> nfs4_create_server()\n"); 1040 1041 server = nfs_alloc_server(); 1042 if (!server) 1043 return ERR_PTR(-ENOMEM); 1044 1045 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1046 1047 /* set up the general RPC client */ 1048 error = nfs4_init_server(server, mount_info->parsed); 1049 if (error < 0) 1050 goto error; 1051 1052 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1053 if (error < 0) 1054 goto error; 1055 1056 dprintk("<-- nfs4_create_server() = %p\n", server); 1057 return server; 1058 1059 error: 1060 nfs_free_server(server); 1061 dprintk("<-- nfs4_create_server() = error %d\n", error); 1062 return ERR_PTR(error); 1063 } 1064 1065 /* 1066 * Create an NFS4 referral server record 1067 */ 1068 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1069 struct nfs_fh *mntfh) 1070 { 1071 struct nfs_client *parent_client; 1072 struct nfs_server *server, *parent_server; 1073 bool auth_probe; 1074 int error; 1075 1076 dprintk("--> nfs4_create_referral_server()\n"); 1077 1078 server = nfs_alloc_server(); 1079 if (!server) 1080 return ERR_PTR(-ENOMEM); 1081 1082 parent_server = NFS_SB(data->sb); 1083 parent_client = parent_server->nfs_client; 1084 1085 /* Initialise the client representation from the parent server */ 1086 nfs_server_copy_userdata(server, parent_server); 1087 1088 /* Get a client representation. 1089 * Note: NFSv4 always uses TCP, */ 1090 error = nfs4_set_client(server, data->hostname, 1091 data->addr, 1092 data->addrlen, 1093 parent_client->cl_ipaddr, 1094 data->authflavor, 1095 rpc_protocol(parent_server->client), 1096 parent_server->client->cl_timeout, 1097 parent_client->cl_mvops->minor_version, 1098 parent_client->cl_net); 1099 if (error < 0) 1100 goto error; 1101 1102 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1103 if (error < 0) 1104 goto error; 1105 1106 auth_probe = parent_server->auth_info.flavor_len < 1; 1107 1108 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1109 if (error < 0) 1110 goto error; 1111 1112 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1113 return server; 1114 1115 error: 1116 nfs_free_server(server); 1117 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1118 return ERR_PTR(error); 1119 } 1120 1121 /* 1122 * Grab the destination's particulars, including lease expiry time. 1123 * 1124 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1125 * we have cached. 1126 */ 1127 static int nfs_probe_destination(struct nfs_server *server) 1128 { 1129 struct inode *inode = d_inode(server->super->s_root); 1130 struct nfs_fattr *fattr; 1131 int error; 1132 1133 fattr = nfs_alloc_fattr(); 1134 if (fattr == NULL) 1135 return -ENOMEM; 1136 1137 /* Sanity: the probe won't work if the destination server 1138 * does not recognize the migrated FH. */ 1139 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1140 1141 nfs_free_fattr(fattr); 1142 return error; 1143 } 1144 1145 /** 1146 * nfs4_update_server - Move an nfs_server to a different nfs_client 1147 * 1148 * @server: represents FSID to be moved 1149 * @hostname: new end-point's hostname 1150 * @sap: new end-point's socket address 1151 * @salen: size of "sap" 1152 * @net: net namespace 1153 * 1154 * The nfs_server must be quiescent before this function is invoked. 1155 * Either its session is drained (NFSv4.1+), or its transport is 1156 * plugged and drained (NFSv4.0). 1157 * 1158 * Returns zero on success, or a negative errno value. 1159 */ 1160 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1161 struct sockaddr *sap, size_t salen, struct net *net) 1162 { 1163 struct nfs_client *clp = server->nfs_client; 1164 struct rpc_clnt *clnt = server->client; 1165 struct xprt_create xargs = { 1166 .ident = clp->cl_proto, 1167 .net = net, 1168 .dstaddr = sap, 1169 .addrlen = salen, 1170 .servername = hostname, 1171 }; 1172 char buf[INET6_ADDRSTRLEN + 1]; 1173 struct sockaddr_storage address; 1174 struct sockaddr *localaddr = (struct sockaddr *)&address; 1175 int error; 1176 1177 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__, 1178 (unsigned long long)server->fsid.major, 1179 (unsigned long long)server->fsid.minor, 1180 hostname); 1181 1182 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1183 if (error != 0) { 1184 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n", 1185 __func__, error); 1186 goto out; 1187 } 1188 1189 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1190 if (error != 0) { 1191 dprintk("<-- %s(): rpc_localaddr returned %d\n", 1192 __func__, error); 1193 goto out; 1194 } 1195 1196 error = -EAFNOSUPPORT; 1197 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) { 1198 dprintk("<-- %s(): rpc_ntop returned %d\n", 1199 __func__, error); 1200 goto out; 1201 } 1202 1203 nfs_server_remove_lists(server); 1204 error = nfs4_set_client(server, hostname, sap, salen, buf, 1205 clp->cl_rpcclient->cl_auth->au_flavor, 1206 clp->cl_proto, clnt->cl_timeout, 1207 clp->cl_minorversion, net); 1208 nfs_put_client(clp); 1209 if (error != 0) { 1210 nfs_server_insert_lists(server); 1211 dprintk("<-- %s(): nfs4_set_client returned %d\n", 1212 __func__, error); 1213 goto out; 1214 } 1215 1216 if (server->nfs_client->cl_hostname == NULL) 1217 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1218 nfs_server_insert_lists(server); 1219 1220 error = nfs_probe_destination(server); 1221 if (error < 0) 1222 goto out; 1223 1224 dprintk("<-- %s() succeeded\n", __func__); 1225 1226 out: 1227 return error; 1228 } 1229