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         if (clp != old) {
 240                 clp->cl_preserve_clid = true;
 241                 nfs_put_client(clp);
 242                 clp = old;
 243                 atomic_inc(&clp->cl_count);
 244         }
 245
 246         return clp;
 247
 248 error:
 249         nfs_mark_client_ready(clp, error);
 250         nfs_put_client(clp);
 251         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 252         return ERR_PTR(error);
 253 }
 254
 255 /*
 256  * SETCLIENTID just did a callback update with the callback ident in
 257  * "drop," but server trunking discovery claims "drop" and "keep" are
 258  * actually the same server.  Swap the callback IDs so that "keep"
 259  * will continue to use the callback ident the server now knows about,
 260  * and so that "keep"'s original callback ident is destroyed when
 261  * "drop" is freed.
 262  */
 263 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 264                                       struct nfs_client *drop)
 265 {
 266         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 267         unsigned int save = keep->cl_cb_ident;
 268
 269         if (keep->cl_cb_ident == drop->cl_cb_ident)
 270                 return;
 271
 272         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 273                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 274
 275         spin_lock(&nn->nfs_client_lock);
 276
 277         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 278         keep->cl_cb_ident = drop->cl_cb_ident;
 279
 280         idr_replace(&nn->cb_ident_idr, drop, save);
 281         drop->cl_cb_ident = save;
 282
 283         spin_unlock(&nn->nfs_client_lock);
 284 }
 285
 286 /**
 287  * nfs40_walk_client_list - Find server that recognizes a client ID
 288  *
 289  * @new: nfs_client with client ID to test
 290  * @result: OUT: found nfs_client, or new
 291  * @cred: credential to use for trunking test
 292  *
 293  * Returns zero, a negative errno, or a negative NFS4ERR status.
 294  * If zero is returned, an nfs_client pointer is planted in "result."
 295  *
 296  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 297  *     the last nfs_client on the list.
 298  */
 299 int nfs40_walk_client_list(struct nfs_client *new,
 300                            struct nfs_client **result,
 301                            struct rpc_cred *cred)
 302 {
 303         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 304         struct nfs_client *pos, *n, *prev = NULL;
 305         struct nfs4_setclientid_res clid = {
 306                 .clientid       = new->cl_clientid,
 307                 .confirm        = new->cl_confirm,
 308         };
 309         int status;
 310
 311         spin_lock(&nn->nfs_client_lock);
 312         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 313                 /* If "pos" isn't marked ready, we can't trust the
 314                  * remaining fields in "pos" */
 315                 if (pos->cl_cons_state < NFS_CS_READY)
 316                         continue;
 317
 318                 if (pos->rpc_ops != new->rpc_ops)
 319                         continue;
 320
 321                 if (pos->cl_proto != new->cl_proto)
 322                         continue;
 323
 324                 if (pos->cl_minorversion != new->cl_minorversion)
 325                         continue;
 326
 327                 if (pos->cl_clientid != new->cl_clientid)
 328                         continue;
 329
 330                 atomic_inc(&pos->cl_count);
 331                 spin_unlock(&nn->nfs_client_lock);
 332
 333                 if (prev)
 334                         nfs_put_client(prev);
 335
 336                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 337                 if (status == 0) {
 338                         nfs4_swap_callback_idents(pos, new);
 339
 340                         nfs_put_client(pos);
 341                         *result = pos;
 342                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 343                                 __func__, pos, atomic_read(&pos->cl_count));
 344                         return 0;
 345                 }
 346                 if (status != -NFS4ERR_STALE_CLIENTID) {
 347                         nfs_put_client(pos);
 348                         dprintk("NFS: <-- %s status = %d, no result\n",
 349                                 __func__, status);
 350                         return status;
 351                 }
 352
 353                 spin_lock(&nn->nfs_client_lock);
 354                 prev = pos;
 355         }
 356
 357         /*
 358          * No matching nfs_client found.  This should be impossible,
 359          * because the new nfs_client has already been added to
 360          * nfs_client_list by nfs_get_client().
 361          *
 362          * Don't BUG(), since the caller is holding a mutex.
 363          */
 364         if (prev)
 365                 nfs_put_client(prev);
 366         spin_unlock(&nn->nfs_client_lock);
 367         pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 368         return -NFS4ERR_STALE_CLIENTID;
 369 }
 370
 371 #ifdef CONFIG_NFS_V4_1
 372 /*
 373  * Returns true if the client IDs match
 374  */
 375 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 376 {
 377         if (a->cl_clientid != b->cl_clientid) {
 378                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 379                         __func__, a->cl_clientid, b->cl_clientid);
 380                 return false;
 381         }
 382         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 383                 __func__, a->cl_clientid, b->cl_clientid);
 384         return true;
 385 }
 386
 387 /*
 388  * Returns true if the server owners match
 389  */
 390 static bool
 391 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 392 {
 393         struct nfs41_server_owner *o1 = a->cl_serverowner;
 394         struct nfs41_server_owner *o2 = b->cl_serverowner;
 395
 396         if (o1->minor_id != o2->minor_id) {
 397                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 398                         __func__);
 399                 return false;
 400         }
 401
 402         if (o1->major_id_sz != o2->major_id_sz)
 403                 goto out_major_mismatch;
 404         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 405                 goto out_major_mismatch;
 406
 407         dprintk("NFS: --> %s server owners match\n", __func__);
 408         return true;
 409
 410 out_major_mismatch:
 411         dprintk("NFS: --> %s server owner major IDs do not match\n",
 412                 __func__);
 413         return false;
 414 }
 415
 416 /**
 417  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 418  *
 419  * @new: nfs_client with client ID to test
 420  * @result: OUT: found nfs_client, or new
 421  * @cred: credential to use for trunking test
 422  *
 423  * Returns zero, a negative errno, or a negative NFS4ERR status.
 424  * If zero is returned, an nfs_client pointer is planted in "result."
 425  *
 426  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 427  *     the last nfs_client on the list.
 428  */
 429 int nfs41_walk_client_list(struct nfs_client *new,
 430                            struct nfs_client **result,
 431                            struct rpc_cred *cred)
 432 {
 433         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 434         struct nfs_client *pos, *n, *prev = NULL;
 435         int error;
 436
 437         spin_lock(&nn->nfs_client_lock);
 438         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 439                 /* If "pos" isn't marked ready, we can't trust the
 440                  * remaining fields in "pos", especially the client
 441                  * ID and serverowner fields.  Wait for CREATE_SESSION
 442                  * to finish. */
 443                 if (pos->cl_cons_state < NFS_CS_READY) {
 444                         atomic_inc(&pos->cl_count);
 445                         spin_unlock(&nn->nfs_client_lock);
 446
 447                         if (prev)
 448                                 nfs_put_client(prev);
 449                         prev = pos;
 450
 451                         error = nfs_wait_client_init_complete(pos);
 452                         if (error < 0) {
 453                                 nfs_put_client(pos);
 454                                 spin_lock(&nn->nfs_client_lock);
 455                                 continue;
 456                         }
 457
 458                         spin_lock(&nn->nfs_client_lock);
 459                 }
 460
 461                 if (pos->rpc_ops != new->rpc_ops)
 462                         continue;
 463
 464                 if (pos->cl_proto != new->cl_proto)
 465                         continue;
 466
 467                 if (pos->cl_minorversion != new->cl_minorversion)
 468                         continue;
 469
 470                 if (!nfs4_match_clientids(pos, new))
 471                         continue;
 472
 473                 if (!nfs4_match_serverowners(pos, new))
 474                         continue;
 475
 476                 spin_unlock(&nn->nfs_client_lock);
 477                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 478                         __func__, pos, atomic_read(&pos->cl_count));
 479
 480                 *result = pos;
 481                 return 0;
 482         }
 483
 484         /*
 485          * No matching nfs_client found.  This should be impossible,
 486          * because the new nfs_client has already been added to
 487          * nfs_client_list by nfs_get_client().
 488          *
 489          * Don't BUG(), since the caller is holding a mutex.
 490          */
 491         spin_unlock(&nn->nfs_client_lock);
 492         pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 493         return -NFS4ERR_STALE_CLIENTID;
 494 }
 495 #endif  /* CONFIG_NFS_V4_1 */
 496
 497 static void nfs4_destroy_server(struct nfs_server *server)
 498 {
 499         nfs_server_return_all_delegations(server);
 500         unset_pnfs_layoutdriver(server);
 501         nfs4_purge_state_owners(server);
 502 }
 503
 504 /*
 505  * NFSv4.0 callback thread helper
 506  *
 507  * Find a client by callback identifier
 508  */
 509 struct nfs_client *
 510 nfs4_find_client_ident(struct net *net, int cb_ident)
 511 {
 512         struct nfs_client *clp;
 513         struct nfs_net *nn = net_generic(net, nfs_net_id);
 514
 515         spin_lock(&nn->nfs_client_lock);
 516         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 517         if (clp)
 518                 atomic_inc(&clp->cl_count);
 519         spin_unlock(&nn->nfs_client_lock);
 520         return clp;
 521 }
 522
 523 #if defined(CONFIG_NFS_V4_1)
 524 /* Common match routine for v4.0 and v4.1 callback services */
 525 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 526                 struct nfs_client *clp, u32 minorversion)
 527 {
 528         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 529
 530         /* Don't match clients that failed to initialise */
 531         if (!(clp->cl_cons_state == NFS_CS_READY ||
 532             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 533                 return false;
 534
 535         smp_rmb();
 536
 537         /* Match the version and minorversion */
 538         if (clp->rpc_ops->version != 4 ||
 539             clp->cl_minorversion != minorversion)
 540                 return false;
 541
 542         /* Match only the IP address, not the port number */
 543         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 544                 return false;
 545
 546         return true;
 547 }
 548
 549 /*
 550  * NFSv4.1 callback thread helper
 551  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 552  * minorversion, and sessionID
 553  *
 554  * Returns NULL if no such client
 555  */
 556 struct nfs_client *
 557 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 558                            struct nfs4_sessionid *sid)
 559 {
 560         struct nfs_client *clp;
 561         struct nfs_net *nn = net_generic(net, nfs_net_id);
 562
 563         spin_lock(&nn->nfs_client_lock);
 564         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 565                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 566                         continue;
 567
 568                 if (!nfs4_has_session(clp))
 569                         continue;
 570
 571                 /* Match sessionid*/
 572                 if (memcmp(clp->cl_session->sess_id.data,
 573                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 574                         continue;
 575
 576                 atomic_inc(&clp->cl_count);
 577                 spin_unlock(&nn->nfs_client_lock);
 578                 return clp;
 579         }
 580         spin_unlock(&nn->nfs_client_lock);
 581         return NULL;
 582 }
 583
 584 #else /* CONFIG_NFS_V4_1 */
 585
 586 struct nfs_client *
 587 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 588                            struct nfs4_sessionid *sid)
 589 {
 590         return NULL;
 591 }
 592 #endif /* CONFIG_NFS_V4_1 */
 593
 594 /*
 595  * Set up an NFS4 client
 596  */
 597 static int nfs4_set_client(struct nfs_server *server,
 598                 const char *hostname,
 599                 const struct sockaddr *addr,
 600                 const size_t addrlen,
 601                 const char *ip_addr,
 602                 rpc_authflavor_t authflavour,
 603                 int proto, const struct rpc_timeout *timeparms,
 604                 u32 minorversion, struct net *net)
 605 {
 606         struct nfs_client_initdata cl_init = {
 607                 .hostname = hostname,
 608                 .addr = addr,
 609                 .addrlen = addrlen,
 610                 .nfs_mod = &nfs_v4,
 611                 .proto = proto,
 612                 .minorversion = minorversion,
 613                 .net = net,
 614         };
 615         struct nfs_client *clp;
 616         int error;
 617
 618         dprintk("--> nfs4_set_client()\n");
 619
 620         if (server->flags & NFS_MOUNT_NORESVPORT)
 621                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 622
 623         /* Allocate or find a client reference we can use */
 624         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 625         if (IS_ERR(clp)) {
 626                 error = PTR_ERR(clp);
 627                 goto error;
 628         }
 629
 630         /*
 631          * Query for the lease time on clientid setup or renewal
 632          *
 633          * Note that this will be set on nfs_clients that were created
 634          * only for the DS role and did not set this bit, but now will
 635          * serve a dual role.
 636          */
 637         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 638
 639         server->nfs_client = clp;
 640         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 641         return 0;
 642 error:
 643         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 644         return error;
 645 }
 646
 647 /*
 648  * Set up a pNFS Data Server client.
 649  *
 650  * Return any existing nfs_client that matches server address,port,version
 651  * and minorversion.
 652  *
 653  * For a new nfs_client, use a soft mount (default), a low retrans and a
 654  * low timeout interval so that if a connection is lost, we retry through
 655  * the MDS.
 656  */
 657 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 658                 const struct sockaddr *ds_addr, int ds_addrlen,
 659                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 660 {
 661         struct nfs_client_initdata cl_init = {
 662                 .addr = ds_addr,
 663                 .addrlen = ds_addrlen,
 664                 .nfs_mod = &nfs_v4,
 665                 .proto = ds_proto,
 666                 .minorversion = mds_clp->cl_minorversion,
 667                 .net = mds_clp->cl_net,
 668         };
 669         struct rpc_timeout ds_timeout;
 670         struct nfs_client *clp;
 671
 672         /*
 673          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 674          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 675          * (section 13.1 RFC 5661).
 676          */
 677         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 678         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 679                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 680
 681         dprintk("<-- %s %p\n", __func__, clp);
 682         return clp;
 683 }
 684 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 685
 686 /*
 687  * Session has been established, and the client marked ready.
 688  * Set the mount rsize and wsize with negotiated fore channel
 689  * attributes which will be bound checked in nfs_server_set_fsinfo.
 690  */
 691 static void nfs4_session_set_rwsize(struct nfs_server *server)
 692 {
 693 #ifdef CONFIG_NFS_V4_1
 694         struct nfs4_session *sess;
 695         u32 server_resp_sz;
 696         u32 server_rqst_sz;
 697
 698         if (!nfs4_has_session(server->nfs_client))
 699                 return;
 700         sess = server->nfs_client->cl_session;
 701         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 702         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 703
 704         if (server->rsize > server_resp_sz)
 705                 server->rsize = server_resp_sz;
 706         if (server->wsize > server_rqst_sz)
 707                 server->wsize = server_rqst_sz;
 708 #endif /* CONFIG_NFS_V4_1 */
 709 }
 710
 711 static int nfs4_server_common_setup(struct nfs_server *server,
 712                 struct nfs_fh *mntfh)
 713 {
 714         struct nfs_fattr *fattr;
 715         int error;
 716
 717         /* data servers support only a subset of NFSv4.1 */
 718         if (is_ds_only_client(server->nfs_client))
 719                 return -EPROTONOSUPPORT;
 720
 721         fattr = nfs_alloc_fattr();
 722         if (fattr == NULL)
 723                 return -ENOMEM;
 724
 725         /* We must ensure the session is initialised first */
 726         error = nfs4_init_session(server);
 727         if (error < 0)
 728                 goto out;
 729
 730         /* Probe the root fh to retrieve its FSID and filehandle */
 731         error = nfs4_get_rootfh(server, mntfh);
 732         if (error < 0)
 733                 goto out;
 734
 735         dprintk("Server FSID: %llx:%llx\n",
 736                         (unsigned long long) server->fsid.major,
 737                         (unsigned long long) server->fsid.minor);
 738         dprintk("Mount FH: %d\n", mntfh->size);
 739
 740         nfs4_session_set_rwsize(server);
 741
 742         error = nfs_probe_fsinfo(server, mntfh, fattr);
 743         if (error < 0)
 744                 goto out;
 745
 746         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 747                 server->namelen = NFS4_MAXNAMLEN;
 748
 749         nfs_server_insert_lists(server);
 750         server->mount_time = jiffies;
 751         server->destroy = nfs4_destroy_server;
 752 out:
 753         nfs_free_fattr(fattr);
 754         return error;
 755 }
 756
 757 /*
 758  * Create a version 4 volume record
 759  */
 760 static int nfs4_init_server(struct nfs_server *server,
 761                 const struct nfs_parsed_mount_data *data)
 762 {
 763         struct rpc_timeout timeparms;
 764         int error;
 765
 766         dprintk("--> nfs4_init_server()\n");
 767
 768         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 769                         data->timeo, data->retrans);
 770
 771         /* Initialise the client representation from the mount data */
 772         server->flags = data->flags;
 773         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
 774         if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
 775                         server->caps |= NFS_CAP_READDIRPLUS;
 776         server->options = data->options;
 777
 778         /* Get a client record */
 779         error = nfs4_set_client(server,
 780                         data->nfs_server.hostname,
 781                         (const struct sockaddr *)&data->nfs_server.address,
 782                         data->nfs_server.addrlen,
 783                         data->client_address,
 784                         data->auth_flavors[0],
 785                         data->nfs_server.protocol,
 786                         &timeparms,
 787                         data->minorversion,
 788                         data->net);
 789         if (error < 0)
 790                 goto error;
 791
 792         /*
 793          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 794          * authentication.
 795          */
 796         if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
 797                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 798
 799         if (data->rsize)
 800                 server->rsize = nfs_block_size(data->rsize, NULL);
 801         if (data->wsize)
 802                 server->wsize = nfs_block_size(data->wsize, NULL);
 803
 804         server->acregmin = data->acregmin * HZ;
 805         server->acregmax = data->acregmax * HZ;
 806         server->acdirmin = data->acdirmin * HZ;
 807         server->acdirmax = data->acdirmax * HZ;
 808
 809         server->port = data->nfs_server.port;
 810
 811         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 812
 813 error:
 814         /* Done */
 815         dprintk("<-- nfs4_init_server() = %d\n", error);
 816         return error;
 817 }
 818
 819 /*
 820  * Create a version 4 volume record
 821  * - keyed on server and FSID
 822  */
 823 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 824                                       struct nfs_fh *mntfh)*/
 825 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 826                                       struct nfs_subversion *nfs_mod)
 827 {
 828         struct nfs_server *server;
 829         int error;
 830
 831         dprintk("--> nfs4_create_server()\n");
 832
 833         server = nfs_alloc_server();
 834         if (!server)
 835                 return ERR_PTR(-ENOMEM);
 836
 837         /* set up the general RPC client */
 838         error = nfs4_init_server(server, mount_info->parsed);
 839         if (error < 0)
 840                 goto error;
 841
 842         error = nfs4_server_common_setup(server, mount_info->mntfh);
 843         if (error < 0)
 844                 goto error;
 845
 846         dprintk("<-- nfs4_create_server() = %p\n", server);
 847         return server;
 848
 849 error:
 850         nfs_free_server(server);
 851         dprintk("<-- nfs4_create_server() = error %d\n", error);
 852         return ERR_PTR(error);
 853 }
 854
 855 /*
 856  * Create an NFS4 referral server record
 857  */
 858 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 859                                                struct nfs_fh *mntfh)
 860 {
 861         struct nfs_client *parent_client;
 862         struct nfs_server *server, *parent_server;
 863         int error;
 864
 865         dprintk("--> nfs4_create_referral_server()\n");
 866
 867         server = nfs_alloc_server();
 868         if (!server)
 869                 return ERR_PTR(-ENOMEM);
 870
 871         parent_server = NFS_SB(data->sb);
 872         parent_client = parent_server->nfs_client;
 873
 874         /* Initialise the client representation from the parent server */
 875         nfs_server_copy_userdata(server, parent_server);
 876         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
 877
 878         /* Get a client representation.
 879          * Note: NFSv4 always uses TCP, */
 880         error = nfs4_set_client(server, data->hostname,
 881                                 data->addr,
 882                                 data->addrlen,
 883                                 parent_client->cl_ipaddr,
 884                                 data->authflavor,
 885                                 rpc_protocol(parent_server->client),
 886                                 parent_server->client->cl_timeout,
 887                                 parent_client->cl_mvops->minor_version,
 888                                 parent_client->cl_net);
 889         if (error < 0)
 890                 goto error;
 891
 892         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 893         if (error < 0)
 894                 goto error;
 895
 896         error = nfs4_server_common_setup(server, mntfh);
 897         if (error < 0)
 898                 goto error;
 899
 900         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 901         return server;
 902
 903 error:
 904         nfs_free_server(server);
 905         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 906         return ERR_PTR(error);
 907 }