fs/nfs/nfs4client.c

   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, 1, 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 #if IS_ENABLED(CONFIG_NFS_V4_1)
 203         init_waitqueue_head(&clp->cl_lock_waitq);
 204 #endif
 205         return clp;
 206
 207 error:
 208         nfs_free_client(clp);
 209         return ERR_PTR(err);
 210 }
 211
 212 /*
 213  * Destroy the NFS4 callback service
 214  */
 215 static void nfs4_destroy_callback(struct nfs_client *clp)
 216 {
 217         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 218                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
 219 }
 220
 221 static void nfs4_shutdown_client(struct nfs_client *clp)
 222 {
 223         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 224                 nfs4_kill_renewd(clp);
 225         clp->cl_mvops->shutdown_client(clp);
 226         nfs4_destroy_callback(clp);
 227         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 228                 nfs_idmap_delete(clp);
 229
 230         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 231         kfree(clp->cl_serverowner);
 232         kfree(clp->cl_serverscope);
 233         kfree(clp->cl_implid);
 234         kfree(clp->cl_owner_id);
 235 }
 236
 237 void nfs4_free_client(struct nfs_client *clp)
 238 {
 239         nfs4_shutdown_client(clp);
 240         nfs_free_client(clp);
 241 }
 242
 243 /*
 244  * Initialize the NFS4 callback service
 245  */
 246 static int nfs4_init_callback(struct nfs_client *clp)
 247 {
 248         struct rpc_xprt *xprt;
 249         int error;
 250
 251         xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 252
 253         if (nfs4_has_session(clp)) {
 254                 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
 255                 if (error < 0)
 256                         return error;
 257         }
 258
 259         error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 260         if (error < 0) {
 261                 dprintk("%s: failed to start callback. Error = %d\n",
 262                         __func__, error);
 263                 return error;
 264         }
 265         __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 266
 267         return 0;
 268 }
 269
 270 /**
 271  * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
 272  * @clp - nfs_client to initialize
 273  *
 274  * Returns zero on success, or a negative errno if some error occurred.
 275  */
 276 int nfs40_init_client(struct nfs_client *clp)
 277 {
 278         struct nfs4_slot_table *tbl;
 279         int ret;
 280
 281         tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
 282         if (tbl == NULL)
 283                 return -ENOMEM;
 284
 285         ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
 286                                         "NFSv4.0 transport Slot table");
 287         if (ret) {
 288                 kfree(tbl);
 289                 return ret;
 290         }
 291
 292         clp->cl_slot_tbl = tbl;
 293         return 0;
 294 }
 295
 296 #if defined(CONFIG_NFS_V4_1)
 297
 298 /**
 299  * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
 300  * @clp - nfs_client to initialize
 301  *
 302  * Returns zero on success, or a negative errno if some error occurred.
 303  */
 304 int nfs41_init_client(struct nfs_client *clp)
 305 {
 306         struct nfs4_session *session = NULL;
 307
 308         /*
 309          * Create the session and mark it expired.
 310          * When a SEQUENCE operation encounters the expired session
 311          * it will do session recovery to initialize it.
 312          */
 313         session = nfs4_alloc_session(clp);
 314         if (!session)
 315                 return -ENOMEM;
 316
 317         clp->cl_session = session;
 318
 319         /*
 320          * The create session reply races with the server back
 321          * channel probe. Mark the client NFS_CS_SESSION_INITING
 322          * so that the client back channel can find the
 323          * nfs_client struct
 324          */
 325         nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 326         return 0;
 327 }
 328
 329 #endif  /* CONFIG_NFS_V4_1 */
 330
 331 /*
 332  * Initialize the minor version specific parts of an NFS4 client record
 333  */
 334 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 335 {
 336         int ret;
 337
 338         ret = clp->cl_mvops->init_client(clp);
 339         if (ret)
 340                 return ret;
 341         return nfs4_init_callback(clp);
 342 }
 343
 344 /**
 345  * nfs4_init_client - Initialise an NFS4 client record
 346  *
 347  * @clp: nfs_client to initialise
 348  * @timeparms: timeout parameters for underlying RPC transport
 349  * @ip_addr: callback IP address in presentation format
 350  * @authflavor: authentication flavor for underlying RPC transport
 351  *
 352  * Returns pointer to an NFS client, or an ERR_PTR value.
 353  */
 354 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 355                                     const struct nfs_client_initdata *cl_init)
 356 {
 357         char buf[INET6_ADDRSTRLEN + 1];
 358         const char *ip_addr = cl_init->ip_addr;
 359         struct nfs_client *old;
 360         int error;
 361
 362         if (clp->cl_cons_state == NFS_CS_READY) {
 363                 /* the client is initialised already */
 364                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 365                 return clp;
 366         }
 367
 368         /* Check NFS protocol revision and initialize RPC op vector */
 369         clp->rpc_ops = &nfs_v4_clientops;
 370
 371         if (clp->cl_minorversion != 0)
 372                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 373         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 374         __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
 375
 376         error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
 377         if (error == -EINVAL)
 378                 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
 379         if (error < 0)
 380                 goto error;
 381
 382         /* If no clientaddr= option was specified, find a usable cb address */
 383         if (ip_addr == NULL) {
 384                 struct sockaddr_storage cb_addr;
 385                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 386
 387                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 388                 if (error < 0)
 389                         goto error;
 390                 error = rpc_ntop(sap, buf, sizeof(buf));
 391                 if (error < 0)
 392                         goto error;
 393                 ip_addr = (const char *)buf;
 394         }
 395         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 396
 397         error = nfs_idmap_new(clp);
 398         if (error < 0) {
 399                 dprintk("%s: failed to create idmapper. Error = %d\n",
 400                         __func__, error);
 401                 goto error;
 402         }
 403         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 404
 405         error = nfs4_init_client_minor_version(clp);
 406         if (error < 0)
 407                 goto error;
 408
 409         if (!nfs4_has_session(clp))
 410                 nfs_mark_client_ready(clp, NFS_CS_READY);
 411
 412         error = nfs4_discover_server_trunking(clp, &old);
 413         if (error < 0)
 414                 goto error;
 415
 416         if (clp != old)
 417                 clp->cl_preserve_clid = true;
 418         nfs_put_client(clp);
 419         return old;
 420
 421 error:
 422         nfs_mark_client_ready(clp, error);
 423         nfs_put_client(clp);
 424         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 425         return ERR_PTR(error);
 426 }
 427
 428 /*
 429  * SETCLIENTID just did a callback update with the callback ident in
 430  * "drop," but server trunking discovery claims "drop" and "keep" are
 431  * actually the same server.  Swap the callback IDs so that "keep"
 432  * will continue to use the callback ident the server now knows about,
 433  * and so that "keep"'s original callback ident is destroyed when
 434  * "drop" is freed.
 435  */
 436 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 437                                       struct nfs_client *drop)
 438 {
 439         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 440         unsigned int save = keep->cl_cb_ident;
 441
 442         if (keep->cl_cb_ident == drop->cl_cb_ident)
 443                 return;
 444
 445         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 446                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 447
 448         spin_lock(&nn->nfs_client_lock);
 449
 450         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 451         keep->cl_cb_ident = drop->cl_cb_ident;
 452
 453         idr_replace(&nn->cb_ident_idr, drop, save);
 454         drop->cl_cb_ident = save;
 455
 456         spin_unlock(&nn->nfs_client_lock);
 457 }
 458
 459 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
 460                 const struct nfs_client *clp2)
 461 {
 462         if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
 463                 return true;
 464         return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
 465 }
 466
 467 /**
 468  * nfs40_walk_client_list - Find server that recognizes a client ID
 469  *
 470  * @new: nfs_client with client ID to test
 471  * @result: OUT: found nfs_client, or new
 472  * @cred: credential to use for trunking test
 473  *
 474  * Returns zero, a negative errno, or a negative NFS4ERR status.
 475  * If zero is returned, an nfs_client pointer is planted in "result."
 476  *
 477  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 478  *     the last nfs_client on the list.
 479  */
 480 int nfs40_walk_client_list(struct nfs_client *new,
 481                            struct nfs_client **result,
 482                            struct rpc_cred *cred)
 483 {
 484         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 485         struct nfs_client *pos, *prev = NULL;
 486         struct nfs4_setclientid_res clid = {
 487                 .clientid       = new->cl_clientid,
 488                 .confirm        = new->cl_confirm,
 489         };
 490         int status = -NFS4ERR_STALE_CLIENTID;
 491
 492         spin_lock(&nn->nfs_client_lock);
 493         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 494
 495                 if (pos->rpc_ops != new->rpc_ops)
 496                         continue;
 497
 498                 if (pos->cl_minorversion != new->cl_minorversion)
 499                         continue;
 500
 501                 /* If "pos" isn't marked ready, we can't trust the
 502                  * remaining fields in "pos" */
 503                 if (pos->cl_cons_state > NFS_CS_READY) {
 504                         atomic_inc(&pos->cl_count);
 505                         spin_unlock(&nn->nfs_client_lock);
 506
 507                         nfs_put_client(prev);
 508                         prev = pos;
 509
 510                         status = nfs_wait_client_init_complete(pos);
 511                         if (status < 0)
 512                                 goto out;
 513                         status = -NFS4ERR_STALE_CLIENTID;
 514                         spin_lock(&nn->nfs_client_lock);
 515                 }
 516                 if (pos->cl_cons_state != NFS_CS_READY)
 517                         continue;
 518
 519                 if (pos->cl_clientid != new->cl_clientid)
 520                         continue;
 521
 522                 if (!nfs4_match_client_owner_id(pos, new))
 523                         continue;
 524
 525                 atomic_inc(&pos->cl_count);
 526                 spin_unlock(&nn->nfs_client_lock);
 527
 528                 nfs_put_client(prev);
 529                 prev = pos;
 530
 531                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 532                 switch (status) {
 533                 case -NFS4ERR_STALE_CLIENTID:
 534                         break;
 535                 case 0:
 536                         nfs4_swap_callback_idents(pos, new);
 537
 538                         prev = NULL;
 539                         *result = pos;
 540                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 541                                 __func__, pos, atomic_read(&pos->cl_count));
 542                         goto out;
 543                 case -ERESTARTSYS:
 544                 case -ETIMEDOUT:
 545                         /* The callback path may have been inadvertently
 546                          * changed. Schedule recovery!
 547                          */
 548                         nfs4_schedule_path_down_recovery(pos);
 549                 default:
 550                         goto out;
 551                 }
 552
 553                 spin_lock(&nn->nfs_client_lock);
 554         }
 555         spin_unlock(&nn->nfs_client_lock);
 556
 557         /* No match found. The server lost our clientid */
 558 out:
 559         nfs_put_client(prev);
 560         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 561         return status;
 562 }
 563
 564 #ifdef CONFIG_NFS_V4_1
 565 /*
 566  * Returns true if the client IDs match
 567  */
 568 static bool nfs4_match_clientids(u64 a, u64 b)
 569 {
 570         if (a != b) {
 571                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 572                         __func__, a, b);
 573                 return false;
 574         }
 575         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 576                 __func__, a, b);
 577         return true;
 578 }
 579
 580 /*
 581  * Returns true if the server major ids match
 582  */
 583 static bool
 584 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 585                                 struct nfs41_server_owner *o2)
 586 {
 587         if (o1->major_id_sz != o2->major_id_sz)
 588                 goto out_major_mismatch;
 589         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 590                 goto out_major_mismatch;
 591
 592         dprintk("NFS: --> %s server owner major IDs match\n", __func__);
 593         return true;
 594
 595 out_major_mismatch:
 596         dprintk("NFS: --> %s server owner major IDs do not match\n",
 597                 __func__);
 598         return false;
 599 }
 600
 601 /*
 602  * Returns true if server minor ids match
 603  */
 604 static bool
 605 nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1,
 606                                 struct nfs41_server_owner *o2)
 607 {
 608         /* Check eir_server_owner so_minor_id */
 609         if (o1->minor_id != o2->minor_id)
 610                 goto out_minor_mismatch;
 611
 612         dprintk("NFS: --> %s server owner minor IDs match\n", __func__);
 613         return true;
 614
 615 out_minor_mismatch:
 616         dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__);
 617         return false;
 618 }
 619
 620 /*
 621  * Returns true if the server scopes match
 622  */
 623 static bool
 624 nfs4_check_server_scope(struct nfs41_server_scope *s1,
 625                         struct nfs41_server_scope *s2)
 626 {
 627         if (s1->server_scope_sz != s2->server_scope_sz)
 628                 goto out_scope_mismatch;
 629         if (memcmp(s1->server_scope, s2->server_scope,
 630                    s1->server_scope_sz) != 0)
 631                 goto out_scope_mismatch;
 632
 633         dprintk("NFS: --> %s server scopes match\n", __func__);
 634         return true;
 635
 636 out_scope_mismatch:
 637         dprintk("NFS: --> %s server scopes do not match\n",
 638                 __func__);
 639         return false;
 640 }
 641
 642 /**
 643  * nfs4_detect_session_trunking - Checks for session trunking.
 644  *
 645  * Called after a successful EXCHANGE_ID on a multi-addr connection.
 646  * Upon success, add the transport.
 647  *
 648  * @clp:    original mount nfs_client
 649  * @res:    result structure from an exchange_id using the original mount
 650  *          nfs_client with a new multi_addr transport
 651  *
 652  * Returns zero on success, otherwise -EINVAL
 653  *
 654  * Note: since the exchange_id for the new multi_addr transport uses the
 655  * same nfs_client from the original mount, the cl_owner_id is reused,
 656  * so eir_clientowner is the same.
 657  */
 658 int nfs4_detect_session_trunking(struct nfs_client *clp,
 659                                  struct nfs41_exchange_id_res *res,
 660                                  struct rpc_xprt *xprt)
 661 {
 662         /* Check eir_clientid */
 663         if (!nfs4_match_clientids(clp->cl_clientid, res->clientid))
 664                 goto out_err;
 665
 666         /* Check eir_server_owner so_major_id */
 667         if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
 668                                              res->server_owner))
 669                 goto out_err;
 670
 671         /* Check eir_server_owner so_minor_id */
 672         if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner,
 673                                              res->server_owner))
 674                 goto out_err;
 675
 676         /* Check eir_server_scope */
 677         if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
 678                 goto out_err;
 679
 680         /* Session trunking passed, add the xprt */
 681         rpc_clnt_xprt_switch_add_xprt(clp->cl_rpcclient, xprt);
 682
 683         pr_info("NFS:  %s: Session trunking succeeded for %s\n",
 684                 clp->cl_hostname,
 685                 xprt->address_strings[RPC_DISPLAY_ADDR]);
 686
 687         return 0;
 688 out_err:
 689         pr_info("NFS:  %s: Session trunking failed for %s\n", clp->cl_hostname,
 690                 xprt->address_strings[RPC_DISPLAY_ADDR]);
 691
 692         return -EINVAL;
 693 }
 694
 695 /**
 696  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 697  *
 698  * @new: nfs_client with client ID to test
 699  * @result: OUT: found nfs_client, or new
 700  * @cred: credential to use for trunking test
 701  *
 702  * Returns zero, a negative errno, or a negative NFS4ERR status.
 703  * If zero is returned, an nfs_client pointer is planted in "result."
 704  *
 705  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 706  *     the last nfs_client on the list.
 707  */
 708 int nfs41_walk_client_list(struct nfs_client *new,
 709                            struct nfs_client **result,
 710                            struct rpc_cred *cred)
 711 {
 712         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 713         struct nfs_client *pos, *prev = NULL;
 714         int status = -NFS4ERR_STALE_CLIENTID;
 715
 716         spin_lock(&nn->nfs_client_lock);
 717         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 718
 719                 if (pos == new)
 720                         goto found;
 721
 722                 if (pos->rpc_ops != new->rpc_ops)
 723                         continue;
 724
 725                 if (pos->cl_minorversion != new->cl_minorversion)
 726                         continue;
 727
 728                 /* If "pos" isn't marked ready, we can't trust the
 729                  * remaining fields in "pos", especially the client
 730                  * ID and serverowner fields.  Wait for CREATE_SESSION
 731                  * to finish. */
 732                 if (pos->cl_cons_state > NFS_CS_READY) {
 733                         atomic_inc(&pos->cl_count);
 734                         spin_unlock(&nn->nfs_client_lock);
 735
 736                         nfs_put_client(prev);
 737                         prev = pos;
 738
 739                         status = nfs_wait_client_init_complete(pos);
 740                         spin_lock(&nn->nfs_client_lock);
 741                         if (status < 0)
 742                                 break;
 743                         status = -NFS4ERR_STALE_CLIENTID;
 744                 }
 745                 if (pos->cl_cons_state != NFS_CS_READY)
 746                         continue;
 747
 748                 if (!nfs4_match_clientids(pos->cl_clientid, new->cl_clientid))
 749                         continue;
 750
 751                 /*
 752                  * Note that session trunking is just a special subcase of
 753                  * client id trunking. In either case, we want to fall back
 754                  * to using the existing nfs_client.
 755                  */
 756                 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
 757                                                      new->cl_serverowner))
 758                         continue;
 759
 760                 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the
 761                  * uniform string, however someone might switch the
 762                  * uniquifier string on us.
 763                  */
 764                 if (!nfs4_match_client_owner_id(pos, new))
 765                         continue;
 766 found:
 767                 atomic_inc(&pos->cl_count);
 768                 *result = pos;
 769                 status = 0;
 770                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 771                         __func__, pos, atomic_read(&pos->cl_count));
 772                 break;
 773         }
 774
 775         spin_unlock(&nn->nfs_client_lock);
 776         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 777         nfs_put_client(prev);
 778         return status;
 779 }
 780 #endif  /* CONFIG_NFS_V4_1 */
 781
 782 static void nfs4_destroy_server(struct nfs_server *server)
 783 {
 784         nfs_server_return_all_delegations(server);
 785         unset_pnfs_layoutdriver(server);
 786         nfs4_purge_state_owners(server);
 787 }
 788
 789 /*
 790  * NFSv4.0 callback thread helper
 791  *
 792  * Find a client by callback identifier
 793  */
 794 struct nfs_client *
 795 nfs4_find_client_ident(struct net *net, int cb_ident)
 796 {
 797         struct nfs_client *clp;
 798         struct nfs_net *nn = net_generic(net, nfs_net_id);
 799
 800         spin_lock(&nn->nfs_client_lock);
 801         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 802         if (clp)
 803                 atomic_inc(&clp->cl_count);
 804         spin_unlock(&nn->nfs_client_lock);
 805         return clp;
 806 }
 807
 808 #if defined(CONFIG_NFS_V4_1)
 809 /* Common match routine for v4.0 and v4.1 callback services */
 810 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 811                 struct nfs_client *clp, u32 minorversion)
 812 {
 813         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 814
 815         /* Don't match clients that failed to initialise */
 816         if (!(clp->cl_cons_state == NFS_CS_READY ||
 817             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 818                 return false;
 819
 820         smp_rmb();
 821
 822         /* Match the version and minorversion */
 823         if (clp->rpc_ops->version != 4 ||
 824             clp->cl_minorversion != minorversion)
 825                 return false;
 826
 827         /* Match only the IP address, not the port number */
 828         return rpc_cmp_addr(addr, clap);
 829 }
 830
 831 /*
 832  * NFSv4.1 callback thread helper
 833  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 834  * minorversion, and sessionID
 835  *
 836  * Returns NULL if no such client
 837  */
 838 struct nfs_client *
 839 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 840                            struct nfs4_sessionid *sid, u32 minorversion)
 841 {
 842         struct nfs_client *clp;
 843         struct nfs_net *nn = net_generic(net, nfs_net_id);
 844
 845         spin_lock(&nn->nfs_client_lock);
 846         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 847                 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
 848                         continue;
 849
 850                 if (!nfs4_has_session(clp))
 851                         continue;
 852
 853                 /* Match sessionid*/
 854                 if (memcmp(clp->cl_session->sess_id.data,
 855                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 856                         continue;
 857
 858                 atomic_inc(&clp->cl_count);
 859                 spin_unlock(&nn->nfs_client_lock);
 860                 return clp;
 861         }
 862         spin_unlock(&nn->nfs_client_lock);
 863         return NULL;
 864 }
 865
 866 #else /* CONFIG_NFS_V4_1 */
 867
 868 struct nfs_client *
 869 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 870                            struct nfs4_sessionid *sid, u32 minorversion)
 871 {
 872         return NULL;
 873 }
 874 #endif /* CONFIG_NFS_V4_1 */
 875
 876 /*
 877  * Set up an NFS4 client
 878  */
 879 static int nfs4_set_client(struct nfs_server *server,
 880                 const char *hostname,
 881                 const struct sockaddr *addr,
 882                 const size_t addrlen,
 883                 const char *ip_addr,
 884                 rpc_authflavor_t authflavour,
 885                 int proto, const struct rpc_timeout *timeparms,
 886                 u32 minorversion, struct net *net)
 887 {
 888         struct nfs_client_initdata cl_init = {
 889                 .hostname = hostname,
 890                 .addr = addr,
 891                 .addrlen = addrlen,
 892                 .ip_addr = ip_addr,
 893                 .nfs_mod = &nfs_v4,
 894                 .proto = proto,
 895                 .minorversion = minorversion,
 896                 .net = net,
 897                 .timeparms = timeparms,
 898         };
 899         struct nfs_client *clp;
 900         int error;
 901
 902         dprintk("--> nfs4_set_client()\n");
 903
 904         if (server->flags & NFS_MOUNT_NORESVPORT)
 905                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 906         if (server->options & NFS_OPTION_MIGRATION)
 907                 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 908
 909         /* Allocate or find a client reference we can use */
 910         clp = nfs_get_client(&cl_init, authflavour);
 911         if (IS_ERR(clp)) {
 912                 error = PTR_ERR(clp);
 913                 goto error;
 914         }
 915
 916         if (server->nfs_client == clp) {
 917                 error = -ELOOP;
 918                 goto error;
 919         }
 920
 921         /*
 922          * Query for the lease time on clientid setup or renewal
 923          *
 924          * Note that this will be set on nfs_clients that were created
 925          * only for the DS role and did not set this bit, but now will
 926          * serve a dual role.
 927          */
 928         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 929
 930         server->nfs_client = clp;
 931         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 932         return 0;
 933 error:
 934         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 935         return error;
 936 }
 937
 938 /*
 939  * Set up a pNFS Data Server client.
 940  *
 941  * Return any existing nfs_client that matches server address,port,version
 942  * and minorversion.
 943  *
 944  * For a new nfs_client, use a soft mount (default), a low retrans and a
 945  * low timeout interval so that if a connection is lost, we retry through
 946  * the MDS.
 947  */
 948 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 949                 const struct sockaddr *ds_addr, int ds_addrlen,
 950                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
 951                 u32 minor_version, rpc_authflavor_t au_flavor)
 952 {
 953         struct rpc_timeout ds_timeout;
 954         struct nfs_client *mds_clp = mds_srv->nfs_client;
 955         struct nfs_client_initdata cl_init = {
 956                 .addr = ds_addr,
 957                 .addrlen = ds_addrlen,
 958                 .nodename = mds_clp->cl_rpcclient->cl_nodename,
 959                 .ip_addr = mds_clp->cl_ipaddr,
 960                 .nfs_mod = &nfs_v4,
 961                 .proto = ds_proto,
 962                 .minorversion = minor_version,
 963                 .net = mds_clp->cl_net,
 964                 .timeparms = &ds_timeout,
 965         };
 966         struct nfs_client *clp;
 967         char buf[INET6_ADDRSTRLEN + 1];
 968
 969         if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
 970                 return ERR_PTR(-EINVAL);
 971         cl_init.hostname = buf;
 972
 973         if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
 974                 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 975
 976         /*
 977          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 978          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 979          * (section 13.1 RFC 5661).
 980          */
 981         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 982         clp = nfs_get_client(&cl_init, au_flavor);
 983
 984         dprintk("<-- %s %p\n", __func__, clp);
 985         return clp;
 986 }
 987 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 988
 989 /*
 990  * Session has been established, and the client marked ready.
 991  * Set the mount rsize and wsize with negotiated fore channel
 992  * attributes which will be bound checked in nfs_server_set_fsinfo.
 993  */
 994 static void nfs4_session_set_rwsize(struct nfs_server *server)
 995 {
 996 #ifdef CONFIG_NFS_V4_1
 997         struct nfs4_session *sess;
 998         u32 server_resp_sz;
 999         u32 server_rqst_sz;
1000
1001         if (!nfs4_has_session(server->nfs_client))
1002                 return;
1003         sess = server->nfs_client->cl_session;
1004         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1005         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1006
1007         if (server->rsize > server_resp_sz)
1008                 server->rsize = server_resp_sz;
1009         if (server->wsize > server_rqst_sz)
1010                 server->wsize = server_rqst_sz;
1011 #endif /* CONFIG_NFS_V4_1 */
1012 }
1013
1014 static int nfs4_server_common_setup(struct nfs_server *server,
1015                 struct nfs_fh *mntfh, bool auth_probe)
1016 {
1017         struct nfs_fattr *fattr;
1018         int error;
1019
1020         /* data servers support only a subset of NFSv4.1 */
1021         if (is_ds_only_client(server->nfs_client))
1022                 return -EPROTONOSUPPORT;
1023
1024         fattr = nfs_alloc_fattr();
1025         if (fattr == NULL)
1026                 return -ENOMEM;
1027
1028         /* We must ensure the session is initialised first */
1029         error = nfs4_init_session(server->nfs_client);
1030         if (error < 0)
1031                 goto out;
1032
1033         /* Set the basic capabilities */
1034         server->caps |= server->nfs_client->cl_mvops->init_caps;
1035         if (server->flags & NFS_MOUNT_NORDIRPLUS)
1036                         server->caps &= ~NFS_CAP_READDIRPLUS;
1037         /*
1038          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1039          * authentication.
1040          */
1041         if (nfs4_disable_idmapping &&
1042                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1043                 server->caps |= NFS_CAP_UIDGID_NOMAP;
1044
1045
1046         /* Probe the root fh to retrieve its FSID and filehandle */
1047         error = nfs4_get_rootfh(server, mntfh, auth_probe);
1048         if (error < 0)
1049                 goto out;
1050
1051         dprintk("Server FSID: %llx:%llx\n",
1052                         (unsigned long long) server->fsid.major,
1053                         (unsigned long long) server->fsid.minor);
1054         nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1055
1056         nfs4_session_set_rwsize(server);
1057
1058         error = nfs_probe_fsinfo(server, mntfh, fattr);
1059         if (error < 0)
1060                 goto out;
1061
1062         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1063                 server->namelen = NFS4_MAXNAMLEN;
1064
1065         nfs_server_insert_lists(server);
1066         server->mount_time = jiffies;
1067         server->destroy = nfs4_destroy_server;
1068 out:
1069         nfs_free_fattr(fattr);
1070         return error;
1071 }
1072
1073 /*
1074  * Create a version 4 volume record
1075  */
1076 static int nfs4_init_server(struct nfs_server *server,
1077                 struct nfs_parsed_mount_data *data)
1078 {
1079         struct rpc_timeout timeparms;
1080         int error;
1081
1082         dprintk("--> nfs4_init_server()\n");
1083
1084         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1085                         data->timeo, data->retrans);
1086
1087         /* Initialise the client representation from the mount data */
1088         server->flags = data->flags;
1089         server->options = data->options;
1090         server->auth_info = data->auth_info;
1091
1092         /* Use the first specified auth flavor. If this flavor isn't
1093          * allowed by the server, use the SECINFO path to try the
1094          * other specified flavors */
1095         if (data->auth_info.flavor_len >= 1)
1096                 data->selected_flavor = data->auth_info.flavors[0];
1097         else
1098                 data->selected_flavor = RPC_AUTH_UNIX;
1099
1100         /* Get a client record */
1101         error = nfs4_set_client(server,
1102                         data->nfs_server.hostname,
1103                         (const struct sockaddr *)&data->nfs_server.address,
1104                         data->nfs_server.addrlen,
1105                         data->client_address,
1106                         data->selected_flavor,
1107                         data->nfs_server.protocol,
1108                         &timeparms,
1109                         data->minorversion,
1110                         data->net);
1111         if (error < 0)
1112                 goto error;
1113
1114         if (data->rsize)
1115                 server->rsize = nfs_block_size(data->rsize, NULL);
1116         if (data->wsize)
1117                 server->wsize = nfs_block_size(data->wsize, NULL);
1118
1119         server->acregmin = data->acregmin * HZ;
1120         server->acregmax = data->acregmax * HZ;
1121         server->acdirmin = data->acdirmin * HZ;
1122         server->acdirmax = data->acdirmax * HZ;
1123
1124         server->port = data->nfs_server.port;
1125
1126         error = nfs_init_server_rpcclient(server, &timeparms,
1127                                           data->selected_flavor);
1128
1129 error:
1130         /* Done */
1131         dprintk("<-- nfs4_init_server() = %d\n", error);
1132         return error;
1133 }
1134
1135 /*
1136  * Create a version 4 volume record
1137  * - keyed on server and FSID
1138  */
1139 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1140                                       struct nfs_fh *mntfh)*/
1141 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1142                                       struct nfs_subversion *nfs_mod)
1143 {
1144         struct nfs_server *server;
1145         bool auth_probe;
1146         int error;
1147
1148         dprintk("--> nfs4_create_server()\n");
1149
1150         server = nfs_alloc_server();
1151         if (!server)
1152                 return ERR_PTR(-ENOMEM);
1153
1154         auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1155
1156         /* set up the general RPC client */
1157         error = nfs4_init_server(server, mount_info->parsed);
1158         if (error < 0)
1159                 goto error;
1160
1161         error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1162         if (error < 0)
1163                 goto error;
1164
1165         dprintk("<-- nfs4_create_server() = %p\n", server);
1166         return server;
1167
1168 error:
1169         nfs_free_server(server);
1170         dprintk("<-- nfs4_create_server() = error %d\n", error);
1171         return ERR_PTR(error);
1172 }
1173
1174 /*
1175  * Create an NFS4 referral server record
1176  */
1177 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1178                                                struct nfs_fh *mntfh)
1179 {
1180         struct nfs_client *parent_client;
1181         struct nfs_server *server, *parent_server;
1182         bool auth_probe;
1183         int error;
1184
1185         dprintk("--> nfs4_create_referral_server()\n");
1186
1187         server = nfs_alloc_server();
1188         if (!server)
1189                 return ERR_PTR(-ENOMEM);
1190
1191         parent_server = NFS_SB(data->sb);
1192         parent_client = parent_server->nfs_client;
1193
1194         /* Initialise the client representation from the parent server */
1195         nfs_server_copy_userdata(server, parent_server);
1196
1197         /* Get a client representation.
1198          * Note: NFSv4 always uses TCP, */
1199         error = nfs4_set_client(server, data->hostname,
1200                                 data->addr,
1201                                 data->addrlen,
1202                                 parent_client->cl_ipaddr,
1203                                 data->authflavor,
1204                                 rpc_protocol(parent_server->client),
1205                                 parent_server->client->cl_timeout,
1206                                 parent_client->cl_mvops->minor_version,
1207                                 parent_client->cl_net);
1208         if (error < 0)
1209                 goto error;
1210
1211         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1212         if (error < 0)
1213                 goto error;
1214
1215         auth_probe = parent_server->auth_info.flavor_len < 1;
1216
1217         error = nfs4_server_common_setup(server, mntfh, auth_probe);
1218         if (error < 0)
1219                 goto error;
1220
1221         dprintk("<-- nfs_create_referral_server() = %p\n", server);
1222         return server;
1223
1224 error:
1225         nfs_free_server(server);
1226         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1227         return ERR_PTR(error);
1228 }
1229
1230 /*
1231  * Grab the destination's particulars, including lease expiry time.
1232  *
1233  * Returns zero if probe succeeded and retrieved FSID matches the FSID
1234  * we have cached.
1235  */
1236 static int nfs_probe_destination(struct nfs_server *server)
1237 {
1238         struct inode *inode = d_inode(server->super->s_root);
1239         struct nfs_fattr *fattr;
1240         int error;
1241
1242         fattr = nfs_alloc_fattr();
1243         if (fattr == NULL)
1244                 return -ENOMEM;
1245
1246         /* Sanity: the probe won't work if the destination server
1247          * does not recognize the migrated FH. */
1248         error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1249
1250         nfs_free_fattr(fattr);
1251         return error;
1252 }
1253
1254 /**
1255  * nfs4_update_server - Move an nfs_server to a different nfs_client
1256  *
1257  * @server: represents FSID to be moved
1258  * @hostname: new end-point's hostname
1259  * @sap: new end-point's socket address
1260  * @salen: size of "sap"
1261  * @net: net namespace
1262  *
1263  * The nfs_server must be quiescent before this function is invoked.
1264  * Either its session is drained (NFSv4.1+), or its transport is
1265  * plugged and drained (NFSv4.0).
1266  *
1267  * Returns zero on success, or a negative errno value.
1268  */
1269 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1270                        struct sockaddr *sap, size_t salen, struct net *net)
1271 {
1272         struct nfs_client *clp = server->nfs_client;
1273         struct rpc_clnt *clnt = server->client;
1274         struct xprt_create xargs = {
1275                 .ident          = clp->cl_proto,
1276                 .net            = net,
1277                 .dstaddr        = sap,
1278                 .addrlen        = salen,
1279                 .servername     = hostname,
1280         };
1281         char buf[INET6_ADDRSTRLEN + 1];
1282         struct sockaddr_storage address;
1283         struct sockaddr *localaddr = (struct sockaddr *)&address;
1284         int error;
1285
1286         dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1287                         (unsigned long long)server->fsid.major,
1288                         (unsigned long long)server->fsid.minor,
1289                         hostname);
1290
1291         error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1292         if (error != 0) {
1293                 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1294                         __func__, error);
1295                 goto out;
1296         }
1297
1298         error = rpc_localaddr(clnt, localaddr, sizeof(address));
1299         if (error != 0) {
1300                 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1301                         __func__, error);
1302                 goto out;
1303         }
1304
1305         error = -EAFNOSUPPORT;
1306         if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1307                 dprintk("<-- %s(): rpc_ntop returned %d\n",
1308                         __func__, error);
1309                 goto out;
1310         }
1311
1312         nfs_server_remove_lists(server);
1313         error = nfs4_set_client(server, hostname, sap, salen, buf,
1314                                 clp->cl_rpcclient->cl_auth->au_flavor,
1315                                 clp->cl_proto, clnt->cl_timeout,
1316                                 clp->cl_minorversion, net);
1317         nfs_put_client(clp);
1318         if (error != 0) {
1319                 nfs_server_insert_lists(server);
1320                 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1321                         __func__, error);
1322                 goto out;
1323         }
1324
1325         if (server->nfs_client->cl_hostname == NULL)
1326                 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1327         nfs_server_insert_lists(server);
1328
1329         error = nfs_probe_destination(server);
1330         if (error < 0)
1331                 goto out;
1332
1333         dprintk("<-- %s() succeeded\n", __func__);
1334
1335 out:
1336         return error;
1337 }