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_idmap.h>
   8 #include <linux/nfs_mount.h>
   9 #include <linux/sunrpc/auth.h>
  10 #include <linux/sunrpc/xprt.h>
  11 #include <linux/sunrpc/bc_xprt.h>
  12 #include "internal.h"
  13 #include "callback.h"
  14 #include "delegation.h"
  15 #include "nfs4session.h"
  16 #include "pnfs.h"
  17 #include "netns.h"
  18
  19 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  20
  21 /*
  22  * Get a unique NFSv4.0 callback identifier which will be used
  23  * by the V4.0 callback service to lookup the nfs_client struct
  24  */
  25 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  26 {
  27         int ret = 0;
  28         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  29
  30         if (clp->rpc_ops->version != 4 || minorversion != 0)
  31                 return ret;
  32 retry:
  33         if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
  34                 return -ENOMEM;
  35         spin_lock(&nn->nfs_client_lock);
  36         ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
  37         spin_unlock(&nn->nfs_client_lock);
  38         if (ret == -EAGAIN)
  39                 goto retry;
  40         return ret;
  41 }
  42
  43 #ifdef CONFIG_NFS_V4_1
  44 static void nfs4_shutdown_session(struct nfs_client *clp)
  45 {
  46         if (nfs4_has_session(clp)) {
  47                 nfs4_destroy_session(clp->cl_session);
  48                 nfs4_destroy_clientid(clp);
  49         }
  50
  51 }
  52 #else /* CONFIG_NFS_V4_1 */
  53 static void nfs4_shutdown_session(struct nfs_client *clp)
  54 {
  55 }
  56 #endif /* CONFIG_NFS_V4_1 */
  57
  58 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
  59 {
  60         int err;
  61         struct nfs_client *clp = nfs_alloc_client(cl_init);
  62         if (IS_ERR(clp))
  63                 return clp;
  64
  65         err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
  66         if (err)
  67                 goto error;
  68
  69         spin_lock_init(&clp->cl_lock);
  70         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
  71         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
  72         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
  73         clp->cl_minorversion = cl_init->minorversion;
  74         clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
  75         return clp;
  76
  77 error:
  78         nfs_free_client(clp);
  79         return ERR_PTR(err);
  80 }
  81
  82 /*
  83  * Destroy the NFS4 callback service
  84  */
  85 static void nfs4_destroy_callback(struct nfs_client *clp)
  86 {
  87         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
  88                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
  89 }
  90
  91 static void nfs4_shutdown_client(struct nfs_client *clp)
  92 {
  93         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
  94                 nfs4_kill_renewd(clp);
  95         nfs4_shutdown_session(clp);
  96         nfs4_destroy_callback(clp);
  97         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
  98                 nfs_idmap_delete(clp);
  99
 100         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 101         kfree(clp->cl_serverowner);
 102         kfree(clp->cl_serverscope);
 103         kfree(clp->cl_implid);
 104 }
 105
 106 void nfs4_free_client(struct nfs_client *clp)
 107 {
 108         nfs4_shutdown_client(clp);
 109         nfs_free_client(clp);
 110 }
 111
 112 /*
 113  * Initialize the NFS4 callback service
 114  */
 115 static int nfs4_init_callback(struct nfs_client *clp)
 116 {
 117         int error;
 118
 119         if (clp->rpc_ops->version == 4) {
 120                 struct rpc_xprt *xprt;
 121
 122                 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 123
 124                 if (nfs4_has_session(clp)) {
 125                         error = xprt_setup_backchannel(xprt,
 126                                                 NFS41_BC_MIN_CALLBACKS);
 127                         if (error < 0)
 128                                 return error;
 129                 }
 130
 131                 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 132                 if (error < 0) {
 133                         dprintk("%s: failed to start callback. Error = %d\n",
 134                                 __func__, error);
 135                         return error;
 136                 }
 137                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 138         }
 139         return 0;
 140 }
 141
 142 /*
 143  * Initialize the minor version specific parts of an NFS4 client record
 144  */
 145 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 146 {
 147 #if defined(CONFIG_NFS_V4_1)
 148         if (clp->cl_mvops->minor_version) {
 149                 struct nfs4_session *session = NULL;
 150                 /*
 151                  * Create the session and mark it expired.
 152                  * When a SEQUENCE operation encounters the expired session
 153                  * it will do session recovery to initialize it.
 154                  */
 155                 session = nfs4_alloc_session(clp);
 156                 if (!session)
 157                         return -ENOMEM;
 158
 159                 clp->cl_session = session;
 160                 /*
 161                  * The create session reply races with the server back
 162                  * channel probe. Mark the client NFS_CS_SESSION_INITING
 163                  * so that the client back channel can find the
 164                  * nfs_client struct
 165                  */
 166                 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 167         }
 168 #endif /* CONFIG_NFS_V4_1 */
 169
 170         return nfs4_init_callback(clp);
 171 }
 172
 173 /**
 174  * nfs4_init_client - Initialise an NFS4 client record
 175  *
 176  * @clp: nfs_client to initialise
 177  * @timeparms: timeout parameters for underlying RPC transport
 178  * @ip_addr: callback IP address in presentation format
 179  * @authflavor: authentication flavor for underlying RPC transport
 180  *
 181  * Returns pointer to an NFS client, or an ERR_PTR value.
 182  */
 183 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 184                                     const struct rpc_timeout *timeparms,
 185                                     const char *ip_addr,
 186                                     rpc_authflavor_t authflavour)
 187 {
 188         char buf[INET6_ADDRSTRLEN + 1];
 189         struct nfs_client *old;
 190         int error;
 191
 192         if (clp->cl_cons_state == NFS_CS_READY) {
 193                 /* the client is initialised already */
 194                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 195                 return clp;
 196         }
 197
 198         /* Check NFS protocol revision and initialize RPC op vector */
 199         clp->rpc_ops = &nfs_v4_clientops;
 200
 201         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 202         error = nfs_create_rpc_client(clp, timeparms, authflavour);
 203         if (error < 0)
 204                 goto error;
 205
 206         /* If no clientaddr= option was specified, find a usable cb address */
 207         if (ip_addr == NULL) {
 208                 struct sockaddr_storage cb_addr;
 209                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 210
 211                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 212                 if (error < 0)
 213                         goto error;
 214                 error = rpc_ntop(sap, buf, sizeof(buf));
 215                 if (error < 0)
 216                         goto error;
 217                 ip_addr = (const char *)buf;
 218         }
 219         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 220
 221         error = nfs_idmap_new(clp);
 222         if (error < 0) {
 223                 dprintk("%s: failed to create idmapper. Error = %d\n",
 224                         __func__, error);
 225                 goto error;
 226         }
 227         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 228
 229         error = nfs4_init_client_minor_version(clp);
 230         if (error < 0)
 231                 goto error;
 232
 233         if (!nfs4_has_session(clp))
 234                 nfs_mark_client_ready(clp, NFS_CS_READY);
 235
 236         error = nfs4_discover_server_trunking(clp, &old);
 237         if (error < 0)
 238                 goto error;
 239         nfs_put_client(clp);
 240         if (clp != old) {
 241                 clp->cl_preserve_clid = true;
 242                 clp = old;
 243         }
 244
 245         return clp;
 246
 247 error:
 248         nfs_mark_client_ready(clp, error);
 249         nfs_put_client(clp);
 250         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 251         return ERR_PTR(error);
 252 }
 253
 254 /*
 255  * SETCLIENTID just did a callback update with the callback ident in
 256  * "drop," but server trunking discovery claims "drop" and "keep" are
 257  * actually the same server.  Swap the callback IDs so that "keep"
 258  * will continue to use the callback ident the server now knows about,
 259  * and so that "keep"'s original callback ident is destroyed when
 260  * "drop" is freed.
 261  */
 262 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 263                                       struct nfs_client *drop)
 264 {
 265         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 266         unsigned int save = keep->cl_cb_ident;
 267
 268         if (keep->cl_cb_ident == drop->cl_cb_ident)
 269                 return;
 270
 271         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 272                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 273
 274         spin_lock(&nn->nfs_client_lock);
 275
 276         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 277         keep->cl_cb_ident = drop->cl_cb_ident;
 278
 279         idr_replace(&nn->cb_ident_idr, drop, save);
 280         drop->cl_cb_ident = save;
 281
 282         spin_unlock(&nn->nfs_client_lock);
 283 }
 284
 285 /**
 286  * nfs40_walk_client_list - Find server that recognizes a client ID
 287  *
 288  * @new: nfs_client with client ID to test
 289  * @result: OUT: found nfs_client, or new
 290  * @cred: credential to use for trunking test
 291  *
 292  * Returns zero, a negative errno, or a negative NFS4ERR status.
 293  * If zero is returned, an nfs_client pointer is planted in "result."
 294  *
 295  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 296  *     the last nfs_client on the list.
 297  */
 298 int nfs40_walk_client_list(struct nfs_client *new,
 299                            struct nfs_client **result,
 300                            struct rpc_cred *cred)
 301 {
 302         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 303         struct nfs_client *pos, *n, *prev = NULL;
 304         struct nfs4_setclientid_res clid = {
 305                 .clientid       = new->cl_clientid,
 306                 .confirm        = new->cl_confirm,
 307         };
 308         int status = -NFS4ERR_STALE_CLIENTID;
 309
 310         spin_lock(&nn->nfs_client_lock);
 311         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 312                 /* If "pos" isn't marked ready, we can't trust the
 313                  * remaining fields in "pos" */
 314                 if (pos->cl_cons_state < NFS_CS_READY)
 315                         continue;
 316
 317                 if (pos->rpc_ops != new->rpc_ops)
 318                         continue;
 319
 320                 if (pos->cl_proto != new->cl_proto)
 321                         continue;
 322
 323                 if (pos->cl_minorversion != new->cl_minorversion)
 324                         continue;
 325
 326                 if (pos->cl_clientid != new->cl_clientid)
 327                         continue;
 328
 329                 atomic_inc(&pos->cl_count);
 330                 spin_unlock(&nn->nfs_client_lock);
 331
 332                 if (prev)
 333                         nfs_put_client(prev);
 334                 prev = pos;
 335
 336                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 337                 switch (status) {
 338                 case -NFS4ERR_STALE_CLIENTID:
 339                         break;
 340                 case 0:
 341                         nfs4_swap_callback_idents(pos, new);
 342
 343                         prev = NULL;
 344                         *result = pos;
 345                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 346                                 __func__, pos, atomic_read(&pos->cl_count));
 347                 default:
 348                         goto out;
 349                 }
 350
 351                 spin_lock(&nn->nfs_client_lock);
 352         }
 353         spin_unlock(&nn->nfs_client_lock);
 354
 355         /* No match found. The server lost our clientid */
 356 out:
 357         if (prev)
 358                 nfs_put_client(prev);
 359         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 360         return status;
 361 }
 362
 363 #ifdef CONFIG_NFS_V4_1
 364 /*
 365  * Returns true if the client IDs match
 366  */
 367 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 368 {
 369         if (a->cl_clientid != b->cl_clientid) {
 370                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 371                         __func__, a->cl_clientid, b->cl_clientid);
 372                 return false;
 373         }
 374         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 375                 __func__, a->cl_clientid, b->cl_clientid);
 376         return true;
 377 }
 378
 379 /*
 380  * Returns true if the server owners match
 381  */
 382 static bool
 383 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 384 {
 385         struct nfs41_server_owner *o1 = a->cl_serverowner;
 386         struct nfs41_server_owner *o2 = b->cl_serverowner;
 387
 388         if (o1->minor_id != o2->minor_id) {
 389                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 390                         __func__);
 391                 return false;
 392         }
 393
 394         if (o1->major_id_sz != o2->major_id_sz)
 395                 goto out_major_mismatch;
 396         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 397                 goto out_major_mismatch;
 398
 399         dprintk("NFS: --> %s server owners match\n", __func__);
 400         return true;
 401
 402 out_major_mismatch:
 403         dprintk("NFS: --> %s server owner major IDs do not match\n",
 404                 __func__);
 405         return false;
 406 }
 407
 408 /**
 409  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 410  *
 411  * @new: nfs_client with client ID to test
 412  * @result: OUT: found nfs_client, or new
 413  * @cred: credential to use for trunking test
 414  *
 415  * Returns zero, a negative errno, or a negative NFS4ERR status.
 416  * If zero is returned, an nfs_client pointer is planted in "result."
 417  *
 418  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 419  *     the last nfs_client on the list.
 420  */
 421 int nfs41_walk_client_list(struct nfs_client *new,
 422                            struct nfs_client **result,
 423                            struct rpc_cred *cred)
 424 {
 425         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 426         struct nfs_client *pos, *n, *prev = NULL;
 427         int status = -NFS4ERR_STALE_CLIENTID;
 428
 429         spin_lock(&nn->nfs_client_lock);
 430         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 431                 /* If "pos" isn't marked ready, we can't trust the
 432                  * remaining fields in "pos", especially the client
 433                  * ID and serverowner fields.  Wait for CREATE_SESSION
 434                  * to finish. */
 435                 if (pos->cl_cons_state < NFS_CS_READY) {
 436                         atomic_inc(&pos->cl_count);
 437                         spin_unlock(&nn->nfs_client_lock);
 438
 439                         if (prev)
 440                                 nfs_put_client(prev);
 441                         prev = pos;
 442
 443                         nfs4_schedule_lease_recovery(pos);
 444                         status = nfs_wait_client_init_complete(pos);
 445                         if (status < 0) {
 446                                 nfs_put_client(pos);
 447                                 spin_lock(&nn->nfs_client_lock);
 448                                 continue;
 449                         }
 450                         status = pos->cl_cons_state;
 451                         spin_lock(&nn->nfs_client_lock);
 452                         if (status < 0)
 453                                 continue;
 454                 }
 455
 456                 if (pos->rpc_ops != new->rpc_ops)
 457                         continue;
 458
 459                 if (pos->cl_proto != new->cl_proto)
 460                         continue;
 461
 462                 if (pos->cl_minorversion != new->cl_minorversion)
 463                         continue;
 464
 465                 if (!nfs4_match_clientids(pos, new))
 466                         continue;
 467
 468                 if (!nfs4_match_serverowners(pos, new))
 469                         continue;
 470
 471                 atomic_inc(&pos->cl_count);
 472                 spin_unlock(&nn->nfs_client_lock);
 473                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 474                         __func__, pos, atomic_read(&pos->cl_count));
 475
 476                 *result = pos;
 477                 return 0;
 478         }
 479
 480         /* No matching nfs_client found. */
 481         spin_unlock(&nn->nfs_client_lock);
 482         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 483         return status;
 484 }
 485 #endif  /* CONFIG_NFS_V4_1 */
 486
 487 static void nfs4_destroy_server(struct nfs_server *server)
 488 {
 489         nfs_server_return_all_delegations(server);
 490         unset_pnfs_layoutdriver(server);
 491         nfs4_purge_state_owners(server);
 492 }
 493
 494 /*
 495  * NFSv4.0 callback thread helper
 496  *
 497  * Find a client by callback identifier
 498  */
 499 struct nfs_client *
 500 nfs4_find_client_ident(struct net *net, int cb_ident)
 501 {
 502         struct nfs_client *clp;
 503         struct nfs_net *nn = net_generic(net, nfs_net_id);
 504
 505         spin_lock(&nn->nfs_client_lock);
 506         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 507         if (clp)
 508                 atomic_inc(&clp->cl_count);
 509         spin_unlock(&nn->nfs_client_lock);
 510         return clp;
 511 }
 512
 513 #if defined(CONFIG_NFS_V4_1)
 514 /* Common match routine for v4.0 and v4.1 callback services */
 515 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 516                 struct nfs_client *clp, u32 minorversion)
 517 {
 518         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 519
 520         /* Don't match clients that failed to initialise */
 521         if (!(clp->cl_cons_state == NFS_CS_READY ||
 522             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 523                 return false;
 524
 525         smp_rmb();
 526
 527         /* Match the version and minorversion */
 528         if (clp->rpc_ops->version != 4 ||
 529             clp->cl_minorversion != minorversion)
 530                 return false;
 531
 532         /* Match only the IP address, not the port number */
 533         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 534                 return false;
 535
 536         return true;
 537 }
 538
 539 /*
 540  * NFSv4.1 callback thread helper
 541  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 542  * minorversion, and sessionID
 543  *
 544  * Returns NULL if no such client
 545  */
 546 struct nfs_client *
 547 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 548                            struct nfs4_sessionid *sid)
 549 {
 550         struct nfs_client *clp;
 551         struct nfs_net *nn = net_generic(net, nfs_net_id);
 552
 553         spin_lock(&nn->nfs_client_lock);
 554         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 555                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 556                         continue;
 557
 558                 if (!nfs4_has_session(clp))
 559                         continue;
 560
 561                 /* Match sessionid*/
 562                 if (memcmp(clp->cl_session->sess_id.data,
 563                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 564                         continue;
 565
 566                 atomic_inc(&clp->cl_count);
 567                 spin_unlock(&nn->nfs_client_lock);
 568                 return clp;
 569         }
 570         spin_unlock(&nn->nfs_client_lock);
 571         return NULL;
 572 }
 573
 574 #else /* CONFIG_NFS_V4_1 */
 575
 576 struct nfs_client *
 577 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 578                            struct nfs4_sessionid *sid)
 579 {
 580         return NULL;
 581 }
 582 #endif /* CONFIG_NFS_V4_1 */
 583
 584 /*
 585  * Set up an NFS4 client
 586  */
 587 static int nfs4_set_client(struct nfs_server *server,
 588                 const char *hostname,
 589                 const struct sockaddr *addr,
 590                 const size_t addrlen,
 591                 const char *ip_addr,
 592                 rpc_authflavor_t authflavour,
 593                 int proto, const struct rpc_timeout *timeparms,
 594                 u32 minorversion, struct net *net)
 595 {
 596         struct nfs_client_initdata cl_init = {
 597                 .hostname = hostname,
 598                 .addr = addr,
 599                 .addrlen = addrlen,
 600                 .nfs_mod = &nfs_v4,
 601                 .proto = proto,
 602                 .minorversion = minorversion,
 603                 .net = net,
 604         };
 605         struct nfs_client *clp;
 606         int error;
 607
 608         dprintk("--> nfs4_set_client()\n");
 609
 610         if (server->flags & NFS_MOUNT_NORESVPORT)
 611                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 612
 613         /* Allocate or find a client reference we can use */
 614         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 615         if (IS_ERR(clp)) {
 616                 error = PTR_ERR(clp);
 617                 goto error;
 618         }
 619
 620         /*
 621          * Query for the lease time on clientid setup or renewal
 622          *
 623          * Note that this will be set on nfs_clients that were created
 624          * only for the DS role and did not set this bit, but now will
 625          * serve a dual role.
 626          */
 627         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 628
 629         server->nfs_client = clp;
 630         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 631         return 0;
 632 error:
 633         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 634         return error;
 635 }
 636
 637 /*
 638  * Set up a pNFS Data Server client.
 639  *
 640  * Return any existing nfs_client that matches server address,port,version
 641  * and minorversion.
 642  *
 643  * For a new nfs_client, use a soft mount (default), a low retrans and a
 644  * low timeout interval so that if a connection is lost, we retry through
 645  * the MDS.
 646  */
 647 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 648                 const struct sockaddr *ds_addr, int ds_addrlen,
 649                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 650 {
 651         struct nfs_client_initdata cl_init = {
 652                 .addr = ds_addr,
 653                 .addrlen = ds_addrlen,
 654                 .nfs_mod = &nfs_v4,
 655                 .proto = ds_proto,
 656                 .minorversion = mds_clp->cl_minorversion,
 657                 .net = mds_clp->cl_net,
 658         };
 659         struct rpc_timeout ds_timeout;
 660         struct nfs_client *clp;
 661
 662         /*
 663          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 664          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 665          * (section 13.1 RFC 5661).
 666          */
 667         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 668         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 669                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 670
 671         dprintk("<-- %s %p\n", __func__, clp);
 672         return clp;
 673 }
 674 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 675
 676 /*
 677  * Session has been established, and the client marked ready.
 678  * Set the mount rsize and wsize with negotiated fore channel
 679  * attributes which will be bound checked in nfs_server_set_fsinfo.
 680  */
 681 static void nfs4_session_set_rwsize(struct nfs_server *server)
 682 {
 683 #ifdef CONFIG_NFS_V4_1
 684         struct nfs4_session *sess;
 685         u32 server_resp_sz;
 686         u32 server_rqst_sz;
 687
 688         if (!nfs4_has_session(server->nfs_client))
 689                 return;
 690         sess = server->nfs_client->cl_session;
 691         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 692         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 693
 694         if (server->rsize > server_resp_sz)
 695                 server->rsize = server_resp_sz;
 696         if (server->wsize > server_rqst_sz)
 697                 server->wsize = server_rqst_sz;
 698 #endif /* CONFIG_NFS_V4_1 */
 699 }
 700
 701 static int nfs4_server_common_setup(struct nfs_server *server,
 702                 struct nfs_fh *mntfh)
 703 {
 704         struct nfs_fattr *fattr;
 705         int error;
 706
 707         /* data servers support only a subset of NFSv4.1 */
 708         if (is_ds_only_client(server->nfs_client))
 709                 return -EPROTONOSUPPORT;
 710
 711         fattr = nfs_alloc_fattr();
 712         if (fattr == NULL)
 713                 return -ENOMEM;
 714
 715         /* We must ensure the session is initialised first */
 716         error = nfs4_init_session(server);
 717         if (error < 0)
 718                 goto out;
 719
 720         /* Probe the root fh to retrieve its FSID and filehandle */
 721         error = nfs4_get_rootfh(server, mntfh);
 722         if (error < 0)
 723                 goto out;
 724
 725         dprintk("Server FSID: %llx:%llx\n",
 726                         (unsigned long long) server->fsid.major,
 727                         (unsigned long long) server->fsid.minor);
 728         dprintk("Mount FH: %d\n", mntfh->size);
 729
 730         nfs4_session_set_rwsize(server);
 731
 732         error = nfs_probe_fsinfo(server, mntfh, fattr);
 733         if (error < 0)
 734                 goto out;
 735
 736         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 737                 server->namelen = NFS4_MAXNAMLEN;
 738
 739         nfs_server_insert_lists(server);
 740         server->mount_time = jiffies;
 741         server->destroy = nfs4_destroy_server;
 742 out:
 743         nfs_free_fattr(fattr);
 744         return error;
 745 }
 746
 747 /*
 748  * Create a version 4 volume record
 749  */
 750 static int nfs4_init_server(struct nfs_server *server,
 751                 const struct nfs_parsed_mount_data *data)
 752 {
 753         struct rpc_timeout timeparms;
 754         int error;
 755
 756         dprintk("--> nfs4_init_server()\n");
 757
 758         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 759                         data->timeo, data->retrans);
 760
 761         /* Initialise the client representation from the mount data */
 762         server->flags = data->flags;
 763         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
 764         if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
 765                         server->caps |= NFS_CAP_READDIRPLUS;
 766         server->options = data->options;
 767
 768         /* Get a client record */
 769         error = nfs4_set_client(server,
 770                         data->nfs_server.hostname,
 771                         (const struct sockaddr *)&data->nfs_server.address,
 772                         data->nfs_server.addrlen,
 773                         data->client_address,
 774                         data->auth_flavors[0],
 775                         data->nfs_server.protocol,
 776                         &timeparms,
 777                         data->minorversion,
 778                         data->net);
 779         if (error < 0)
 780                 goto error;
 781
 782         /*
 783          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 784          * authentication.
 785          */
 786         if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
 787                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 788
 789         if (data->rsize)
 790                 server->rsize = nfs_block_size(data->rsize, NULL);
 791         if (data->wsize)
 792                 server->wsize = nfs_block_size(data->wsize, NULL);
 793
 794         server->acregmin = data->acregmin * HZ;
 795         server->acregmax = data->acregmax * HZ;
 796         server->acdirmin = data->acdirmin * HZ;
 797         server->acdirmax = data->acdirmax * HZ;
 798
 799         server->port = data->nfs_server.port;
 800
 801         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 802
 803 error:
 804         /* Done */
 805         dprintk("<-- nfs4_init_server() = %d\n", error);
 806         return error;
 807 }
 808
 809 /*
 810  * Create a version 4 volume record
 811  * - keyed on server and FSID
 812  */
 813 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 814                                       struct nfs_fh *mntfh)*/
 815 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 816                                       struct nfs_subversion *nfs_mod)
 817 {
 818         struct nfs_server *server;
 819         int error;
 820
 821         dprintk("--> nfs4_create_server()\n");
 822
 823         server = nfs_alloc_server();
 824         if (!server)
 825                 return ERR_PTR(-ENOMEM);
 826
 827         /* set up the general RPC client */
 828         error = nfs4_init_server(server, mount_info->parsed);
 829         if (error < 0)
 830                 goto error;
 831
 832         error = nfs4_server_common_setup(server, mount_info->mntfh);
 833         if (error < 0)
 834                 goto error;
 835
 836         dprintk("<-- nfs4_create_server() = %p\n", server);
 837         return server;
 838
 839 error:
 840         nfs_free_server(server);
 841         dprintk("<-- nfs4_create_server() = error %d\n", error);
 842         return ERR_PTR(error);
 843 }
 844
 845 /*
 846  * Create an NFS4 referral server record
 847  */
 848 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 849                                                struct nfs_fh *mntfh)
 850 {
 851         struct nfs_client *parent_client;
 852         struct nfs_server *server, *parent_server;
 853         int error;
 854
 855         dprintk("--> nfs4_create_referral_server()\n");
 856
 857         server = nfs_alloc_server();
 858         if (!server)
 859                 return ERR_PTR(-ENOMEM);
 860
 861         parent_server = NFS_SB(data->sb);
 862         parent_client = parent_server->nfs_client;
 863
 864         /* Initialise the client representation from the parent server */
 865         nfs_server_copy_userdata(server, parent_server);
 866         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
 867
 868         /* Get a client representation.
 869          * Note: NFSv4 always uses TCP, */
 870         error = nfs4_set_client(server, data->hostname,
 871                                 data->addr,
 872                                 data->addrlen,
 873                                 parent_client->cl_ipaddr,
 874                                 data->authflavor,
 875                                 rpc_protocol(parent_server->client),
 876                                 parent_server->client->cl_timeout,
 877                                 parent_client->cl_mvops->minor_version,
 878                                 parent_client->cl_net);
 879         if (error < 0)
 880                 goto error;
 881
 882         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 883         if (error < 0)
 884                 goto error;
 885
 886         error = nfs4_server_common_setup(server, mntfh);
 887         if (error < 0)
 888                 goto error;
 889
 890         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 891         return server;
 892
 893 error:
 894         nfs_free_server(server);
 895         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 896         return ERR_PTR(error);
 897 }