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 "pnfs.h"
  16 #include "netns.h"
  17
  18 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  19
  20 /*
  21  * Get a unique NFSv4.0 callback identifier which will be used
  22  * by the V4.0 callback service to lookup the nfs_client struct
  23  */
  24 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  25 {
  26         int ret = 0;
  27         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  28
  29         if (clp->rpc_ops->version != 4 || minorversion != 0)
  30                 return ret;
  31 retry:
  32         if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
  33                 return -ENOMEM;
  34         spin_lock(&nn->nfs_client_lock);
  35         ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
  36         spin_unlock(&nn->nfs_client_lock);
  37         if (ret == -EAGAIN)
  38                 goto retry;
  39         return ret;
  40 }
  41
  42 #ifdef CONFIG_NFS_V4_1
  43 static void nfs4_shutdown_session(struct nfs_client *clp)
  44 {
  45         if (nfs4_has_session(clp)) {
  46                 nfs4_destroy_session(clp->cl_session);
  47                 nfs4_destroy_clientid(clp);
  48         }
  49
  50 }
  51 #else /* CONFIG_NFS_V4_1 */
  52 static void nfs4_shutdown_session(struct nfs_client *clp)
  53 {
  54 }
  55 #endif /* CONFIG_NFS_V4_1 */
  56
  57 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
  58 {
  59         int err;
  60         struct nfs_client *clp = nfs_alloc_client(cl_init);
  61         if (IS_ERR(clp))
  62                 return clp;
  63
  64         err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
  65         if (err)
  66                 goto error;
  67
  68         spin_lock_init(&clp->cl_lock);
  69         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
  70         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
  71         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
  72         clp->cl_minorversion = cl_init->minorversion;
  73         clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
  74         return clp;
  75
  76 error:
  77         nfs_free_client(clp);
  78         return ERR_PTR(err);
  79 }
  80
  81 /*
  82  * Destroy the NFS4 callback service
  83  */
  84 static void nfs4_destroy_callback(struct nfs_client *clp)
  85 {
  86         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
  87                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
  88 }
  89
  90 static void nfs4_shutdown_client(struct nfs_client *clp)
  91 {
  92         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
  93                 nfs4_kill_renewd(clp);
  94         nfs4_shutdown_session(clp);
  95         nfs4_destroy_callback(clp);
  96         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
  97                 nfs_idmap_delete(clp);
  98
  99         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 100         kfree(clp->cl_serverowner);
 101         kfree(clp->cl_serverscope);
 102         kfree(clp->cl_implid);
 103 }
 104
 105 void nfs4_free_client(struct nfs_client *clp)
 106 {
 107         nfs4_shutdown_client(clp);
 108         nfs_free_client(clp);
 109 }
 110
 111 /*
 112  * Initialize the NFS4 callback service
 113  */
 114 static int nfs4_init_callback(struct nfs_client *clp)
 115 {
 116         int error;
 117
 118         if (clp->rpc_ops->version == 4) {
 119                 struct rpc_xprt *xprt;
 120
 121                 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 122
 123                 if (nfs4_has_session(clp)) {
 124                         error = xprt_setup_backchannel(xprt,
 125                                                 NFS41_BC_MIN_CALLBACKS);
 126                         if (error < 0)
 127                                 return error;
 128                 }
 129
 130                 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 131                 if (error < 0) {
 132                         dprintk("%s: failed to start callback. Error = %d\n",
 133                                 __func__, error);
 134                         return error;
 135                 }
 136                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 137         }
 138         return 0;
 139 }
 140
 141 /*
 142  * Initialize the minor version specific parts of an NFS4 client record
 143  */
 144 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 145 {
 146 #if defined(CONFIG_NFS_V4_1)
 147         if (clp->cl_mvops->minor_version) {
 148                 struct nfs4_session *session = NULL;
 149                 /*
 150                  * Create the session and mark it expired.
 151                  * When a SEQUENCE operation encounters the expired session
 152                  * it will do session recovery to initialize it.
 153                  */
 154                 session = nfs4_alloc_session(clp);
 155                 if (!session)
 156                         return -ENOMEM;
 157
 158                 clp->cl_session = session;
 159                 /*
 160                  * The create session reply races with the server back
 161                  * channel probe. Mark the client NFS_CS_SESSION_INITING
 162                  * so that the client back channel can find the
 163                  * nfs_client struct
 164                  */
 165                 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 166         }
 167 #endif /* CONFIG_NFS_V4_1 */
 168
 169         return nfs4_init_callback(clp);
 170 }
 171
 172 /**
 173  * nfs4_init_client - Initialise an NFS4 client record
 174  *
 175  * @clp: nfs_client to initialise
 176  * @timeparms: timeout parameters for underlying RPC transport
 177  * @ip_addr: callback IP address in presentation format
 178  * @authflavor: authentication flavor for underlying RPC transport
 179  *
 180  * Returns pointer to an NFS client, or an ERR_PTR value.
 181  */
 182 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 183                                     const struct rpc_timeout *timeparms,
 184                                     const char *ip_addr,
 185                                     rpc_authflavor_t authflavour)
 186 {
 187         char buf[INET6_ADDRSTRLEN + 1];
 188         struct nfs_client *old;
 189         int error;
 190
 191         if (clp->cl_cons_state == NFS_CS_READY) {
 192                 /* the client is initialised already */
 193                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 194                 return clp;
 195         }
 196
 197         /* Check NFS protocol revision and initialize RPC op vector */
 198         clp->rpc_ops = &nfs_v4_clientops;
 199
 200         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 201         error = nfs_create_rpc_client(clp, timeparms, authflavour);
 202         if (error < 0)
 203                 goto error;
 204
 205         /* If no clientaddr= option was specified, find a usable cb address */
 206         if (ip_addr == NULL) {
 207                 struct sockaddr_storage cb_addr;
 208                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 209
 210                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 211                 if (error < 0)
 212                         goto error;
 213                 error = rpc_ntop(sap, buf, sizeof(buf));
 214                 if (error < 0)
 215                         goto error;
 216                 ip_addr = (const char *)buf;
 217         }
 218         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 219
 220         error = nfs_idmap_new(clp);
 221         if (error < 0) {
 222                 dprintk("%s: failed to create idmapper. Error = %d\n",
 223                         __func__, error);
 224                 goto error;
 225         }
 226         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 227
 228         error = nfs4_init_client_minor_version(clp);
 229         if (error < 0)
 230                 goto error;
 231
 232         if (!nfs4_has_session(clp))
 233                 nfs_mark_client_ready(clp, NFS_CS_READY);
 234
 235         error = nfs4_discover_server_trunking(clp, &old);
 236         if (error < 0)
 237                 goto error;
 238         if (clp != old) {
 239                 clp->cl_preserve_clid = true;
 240                 nfs_put_client(clp);
 241                 clp = old;
 242                 atomic_inc(&clp->cl_count);
 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;
 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
 335                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 336                 if (status == 0) {
 337                         nfs4_swap_callback_idents(pos, new);
 338
 339                         nfs_put_client(pos);
 340                         *result = pos;
 341                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 342                                 __func__, pos, atomic_read(&pos->cl_count));
 343                         return 0;
 344                 }
 345                 if (status != -NFS4ERR_STALE_CLIENTID) {
 346                         nfs_put_client(pos);
 347                         dprintk("NFS: <-- %s status = %d, no result\n",
 348                                 __func__, status);
 349                         return status;
 350                 }
 351
 352                 spin_lock(&nn->nfs_client_lock);
 353                 prev = pos;
 354         }
 355
 356         /*
 357          * No matching nfs_client found.  This should be impossible,
 358          * because the new nfs_client has already been added to
 359          * nfs_client_list by nfs_get_client().
 360          *
 361          * Don't BUG(), since the caller is holding a mutex.
 362          */
 363         if (prev)
 364                 nfs_put_client(prev);
 365         spin_unlock(&nn->nfs_client_lock);
 366         pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 367         return -NFS4ERR_STALE_CLIENTID;
 368 }
 369
 370 #ifdef CONFIG_NFS_V4_1
 371 /*
 372  * Returns true if the client IDs match
 373  */
 374 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 375 {
 376         if (a->cl_clientid != b->cl_clientid) {
 377                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 378                         __func__, a->cl_clientid, b->cl_clientid);
 379                 return false;
 380         }
 381         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 382                 __func__, a->cl_clientid, b->cl_clientid);
 383         return true;
 384 }
 385
 386 /*
 387  * Returns true if the server owners match
 388  */
 389 static bool
 390 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 391 {
 392         struct nfs41_server_owner *o1 = a->cl_serverowner;
 393         struct nfs41_server_owner *o2 = b->cl_serverowner;
 394
 395         if (o1->minor_id != o2->minor_id) {
 396                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 397                         __func__);
 398                 return false;
 399         }
 400
 401         if (o1->major_id_sz != o2->major_id_sz)
 402                 goto out_major_mismatch;
 403         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 404                 goto out_major_mismatch;
 405
 406         dprintk("NFS: --> %s server owners match\n", __func__);
 407         return true;
 408
 409 out_major_mismatch:
 410         dprintk("NFS: --> %s server owner major IDs do not match\n",
 411                 __func__);
 412         return false;
 413 }
 414
 415 /**
 416  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 417  *
 418  * @new: nfs_client with client ID to test
 419  * @result: OUT: found nfs_client, or new
 420  * @cred: credential to use for trunking test
 421  *
 422  * Returns zero, a negative errno, or a negative NFS4ERR status.
 423  * If zero is returned, an nfs_client pointer is planted in "result."
 424  *
 425  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 426  *     the last nfs_client on the list.
 427  */
 428 int nfs41_walk_client_list(struct nfs_client *new,
 429                            struct nfs_client **result,
 430                            struct rpc_cred *cred)
 431 {
 432         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 433         struct nfs_client *pos, *n, *prev = NULL;
 434         int error;
 435
 436         spin_lock(&nn->nfs_client_lock);
 437         list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
 438                 /* If "pos" isn't marked ready, we can't trust the
 439                  * remaining fields in "pos", especially the client
 440                  * ID and serverowner fields.  Wait for CREATE_SESSION
 441                  * to finish. */
 442                 if (pos->cl_cons_state < NFS_CS_READY) {
 443                         atomic_inc(&pos->cl_count);
 444                         spin_unlock(&nn->nfs_client_lock);
 445
 446                         if (prev)
 447                                 nfs_put_client(prev);
 448                         prev = pos;
 449
 450                         error = nfs_wait_client_init_complete(pos);
 451                         if (error < 0) {
 452                                 nfs_put_client(pos);
 453                                 spin_lock(&nn->nfs_client_lock);
 454                                 continue;
 455                         }
 456
 457                         spin_lock(&nn->nfs_client_lock);
 458                 }
 459
 460                 if (pos->rpc_ops != new->rpc_ops)
 461                         continue;
 462
 463                 if (pos->cl_proto != new->cl_proto)
 464                         continue;
 465
 466                 if (pos->cl_minorversion != new->cl_minorversion)
 467                         continue;
 468
 469                 if (!nfs4_match_clientids(pos, new))
 470                         continue;
 471
 472                 if (!nfs4_match_serverowners(pos, new))
 473                         continue;
 474
 475                 spin_unlock(&nn->nfs_client_lock);
 476                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 477                         __func__, pos, atomic_read(&pos->cl_count));
 478
 479                 *result = pos;
 480                 return 0;
 481         }
 482
 483         /*
 484          * No matching nfs_client found.  This should be impossible,
 485          * because the new nfs_client has already been added to
 486          * nfs_client_list by nfs_get_client().
 487          *
 488          * Don't BUG(), since the caller is holding a mutex.
 489          */
 490         spin_unlock(&nn->nfs_client_lock);
 491         pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
 492         return -NFS4ERR_STALE_CLIENTID;
 493 }
 494 #endif  /* CONFIG_NFS_V4_1 */
 495
 496 static void nfs4_destroy_server(struct nfs_server *server)
 497 {
 498         nfs_server_return_all_delegations(server);
 499         unset_pnfs_layoutdriver(server);
 500         nfs4_purge_state_owners(server);
 501 }
 502
 503 /*
 504  * NFSv4.0 callback thread helper
 505  *
 506  * Find a client by callback identifier
 507  */
 508 struct nfs_client *
 509 nfs4_find_client_ident(struct net *net, int cb_ident)
 510 {
 511         struct nfs_client *clp;
 512         struct nfs_net *nn = net_generic(net, nfs_net_id);
 513
 514         spin_lock(&nn->nfs_client_lock);
 515         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 516         if (clp)
 517                 atomic_inc(&clp->cl_count);
 518         spin_unlock(&nn->nfs_client_lock);
 519         return clp;
 520 }
 521
 522 #if defined(CONFIG_NFS_V4_1)
 523 /* Common match routine for v4.0 and v4.1 callback services */
 524 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 525                 struct nfs_client *clp, u32 minorversion)
 526 {
 527         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 528
 529         /* Don't match clients that failed to initialise */
 530         if (!(clp->cl_cons_state == NFS_CS_READY ||
 531             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 532                 return false;
 533
 534         smp_rmb();
 535
 536         /* Match the version and minorversion */
 537         if (clp->rpc_ops->version != 4 ||
 538             clp->cl_minorversion != minorversion)
 539                 return false;
 540
 541         /* Match only the IP address, not the port number */
 542         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 543                 return false;
 544
 545         return true;
 546 }
 547
 548 /*
 549  * NFSv4.1 callback thread helper
 550  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 551  * minorversion, and sessionID
 552  *
 553  * Returns NULL if no such client
 554  */
 555 struct nfs_client *
 556 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 557                            struct nfs4_sessionid *sid)
 558 {
 559         struct nfs_client *clp;
 560         struct nfs_net *nn = net_generic(net, nfs_net_id);
 561
 562         spin_lock(&nn->nfs_client_lock);
 563         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 564                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 565                         continue;
 566
 567                 if (!nfs4_has_session(clp))
 568                         continue;
 569
 570                 /* Match sessionid*/
 571                 if (memcmp(clp->cl_session->sess_id.data,
 572                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 573                         continue;
 574
 575                 atomic_inc(&clp->cl_count);
 576                 spin_unlock(&nn->nfs_client_lock);
 577                 return clp;
 578         }
 579         spin_unlock(&nn->nfs_client_lock);
 580         return NULL;
 581 }
 582
 583 #else /* CONFIG_NFS_V4_1 */
 584
 585 struct nfs_client *
 586 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 587                            struct nfs4_sessionid *sid)
 588 {
 589         return NULL;
 590 }
 591 #endif /* CONFIG_NFS_V4_1 */
 592
 593 /*
 594  * Set up an NFS4 client
 595  */
 596 static int nfs4_set_client(struct nfs_server *server,
 597                 const char *hostname,
 598                 const struct sockaddr *addr,
 599                 const size_t addrlen,
 600                 const char *ip_addr,
 601                 rpc_authflavor_t authflavour,
 602                 int proto, const struct rpc_timeout *timeparms,
 603                 u32 minorversion, struct net *net)
 604 {
 605         struct nfs_client_initdata cl_init = {
 606                 .hostname = hostname,
 607                 .addr = addr,
 608                 .addrlen = addrlen,
 609                 .nfs_mod = &nfs_v4,
 610                 .proto = proto,
 611                 .minorversion = minorversion,
 612                 .net = net,
 613         };
 614         struct nfs_client *clp;
 615         int error;
 616
 617         dprintk("--> nfs4_set_client()\n");
 618
 619         if (server->flags & NFS_MOUNT_NORESVPORT)
 620                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 621
 622         /* Allocate or find a client reference we can use */
 623         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 624         if (IS_ERR(clp)) {
 625                 error = PTR_ERR(clp);
 626                 goto error;
 627         }
 628
 629         /*
 630          * Query for the lease time on clientid setup or renewal
 631          *
 632          * Note that this will be set on nfs_clients that were created
 633          * only for the DS role and did not set this bit, but now will
 634          * serve a dual role.
 635          */
 636         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 637
 638         server->nfs_client = clp;
 639         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 640         return 0;
 641 error:
 642         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 643         return error;
 644 }
 645
 646 /*
 647  * Set up a pNFS Data Server client.
 648  *
 649  * Return any existing nfs_client that matches server address,port,version
 650  * and minorversion.
 651  *
 652  * For a new nfs_client, use a soft mount (default), a low retrans and a
 653  * low timeout interval so that if a connection is lost, we retry through
 654  * the MDS.
 655  */
 656 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 657                 const struct sockaddr *ds_addr, int ds_addrlen,
 658                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 659 {
 660         struct nfs_client_initdata cl_init = {
 661                 .addr = ds_addr,
 662                 .addrlen = ds_addrlen,
 663                 .nfs_mod = &nfs_v4,
 664                 .proto = ds_proto,
 665                 .minorversion = mds_clp->cl_minorversion,
 666                 .net = mds_clp->cl_net,
 667         };
 668         struct rpc_timeout ds_timeout;
 669         struct nfs_client *clp;
 670
 671         /*
 672          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 673          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 674          * (section 13.1 RFC 5661).
 675          */
 676         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 677         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 678                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 679
 680         dprintk("<-- %s %p\n", __func__, clp);
 681         return clp;
 682 }
 683 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 684
 685 /*
 686  * Session has been established, and the client marked ready.
 687  * Set the mount rsize and wsize with negotiated fore channel
 688  * attributes which will be bound checked in nfs_server_set_fsinfo.
 689  */
 690 static void nfs4_session_set_rwsize(struct nfs_server *server)
 691 {
 692 #ifdef CONFIG_NFS_V4_1
 693         struct nfs4_session *sess;
 694         u32 server_resp_sz;
 695         u32 server_rqst_sz;
 696
 697         if (!nfs4_has_session(server->nfs_client))
 698                 return;
 699         sess = server->nfs_client->cl_session;
 700         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 701         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 702
 703         if (server->rsize > server_resp_sz)
 704                 server->rsize = server_resp_sz;
 705         if (server->wsize > server_rqst_sz)
 706                 server->wsize = server_rqst_sz;
 707 #endif /* CONFIG_NFS_V4_1 */
 708 }
 709
 710 static int nfs4_server_common_setup(struct nfs_server *server,
 711                 struct nfs_fh *mntfh)
 712 {
 713         struct nfs_fattr *fattr;
 714         int error;
 715
 716         BUG_ON(!server->nfs_client);
 717         BUG_ON(!server->nfs_client->rpc_ops);
 718         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 719
 720         /* data servers support only a subset of NFSv4.1 */
 721         if (is_ds_only_client(server->nfs_client))
 722                 return -EPROTONOSUPPORT;
 723
 724         fattr = nfs_alloc_fattr();
 725         if (fattr == NULL)
 726                 return -ENOMEM;
 727
 728         /* We must ensure the session is initialised first */
 729         error = nfs4_init_session(server);
 730         if (error < 0)
 731                 goto out;
 732
 733         /* Probe the root fh to retrieve its FSID and filehandle */
 734         error = nfs4_get_rootfh(server, mntfh);
 735         if (error < 0)
 736                 goto out;
 737
 738         dprintk("Server FSID: %llx:%llx\n",
 739                         (unsigned long long) server->fsid.major,
 740                         (unsigned long long) server->fsid.minor);
 741         dprintk("Mount FH: %d\n", mntfh->size);
 742
 743         nfs4_session_set_rwsize(server);
 744
 745         error = nfs_probe_fsinfo(server, mntfh, fattr);
 746         if (error < 0)
 747                 goto out;
 748
 749         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 750                 server->namelen = NFS4_MAXNAMLEN;
 751
 752         nfs_server_insert_lists(server);
 753         server->mount_time = jiffies;
 754         server->destroy = nfs4_destroy_server;
 755 out:
 756         nfs_free_fattr(fattr);
 757         return error;
 758 }
 759
 760 /*
 761  * Create a version 4 volume record
 762  */
 763 static int nfs4_init_server(struct nfs_server *server,
 764                 const struct nfs_parsed_mount_data *data)
 765 {
 766         struct rpc_timeout timeparms;
 767         int error;
 768
 769         dprintk("--> nfs4_init_server()\n");
 770
 771         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 772                         data->timeo, data->retrans);
 773
 774         /* Initialise the client representation from the mount data */
 775         server->flags = data->flags;
 776         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
 777         if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
 778                         server->caps |= NFS_CAP_READDIRPLUS;
 779         server->options = data->options;
 780
 781         /* Get a client record */
 782         error = nfs4_set_client(server,
 783                         data->nfs_server.hostname,
 784                         (const struct sockaddr *)&data->nfs_server.address,
 785                         data->nfs_server.addrlen,
 786                         data->client_address,
 787                         data->auth_flavors[0],
 788                         data->nfs_server.protocol,
 789                         &timeparms,
 790                         data->minorversion,
 791                         data->net);
 792         if (error < 0)
 793                 goto error;
 794
 795         /*
 796          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 797          * authentication.
 798          */
 799         if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
 800                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 801
 802         if (data->rsize)
 803                 server->rsize = nfs_block_size(data->rsize, NULL);
 804         if (data->wsize)
 805                 server->wsize = nfs_block_size(data->wsize, NULL);
 806
 807         server->acregmin = data->acregmin * HZ;
 808         server->acregmax = data->acregmax * HZ;
 809         server->acdirmin = data->acdirmin * HZ;
 810         server->acdirmax = data->acdirmax * HZ;
 811
 812         server->port = data->nfs_server.port;
 813
 814         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 815
 816 error:
 817         /* Done */
 818         dprintk("<-- nfs4_init_server() = %d\n", error);
 819         return error;
 820 }
 821
 822 /*
 823  * Create a version 4 volume record
 824  * - keyed on server and FSID
 825  */
 826 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 827                                       struct nfs_fh *mntfh)*/
 828 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 829                                       struct nfs_subversion *nfs_mod)
 830 {
 831         struct nfs_server *server;
 832         int error;
 833
 834         dprintk("--> nfs4_create_server()\n");
 835
 836         server = nfs_alloc_server();
 837         if (!server)
 838                 return ERR_PTR(-ENOMEM);
 839
 840         /* set up the general RPC client */
 841         error = nfs4_init_server(server, mount_info->parsed);
 842         if (error < 0)
 843                 goto error;
 844
 845         error = nfs4_server_common_setup(server, mount_info->mntfh);
 846         if (error < 0)
 847                 goto error;
 848
 849         dprintk("<-- nfs4_create_server() = %p\n", server);
 850         return server;
 851
 852 error:
 853         nfs_free_server(server);
 854         dprintk("<-- nfs4_create_server() = error %d\n", error);
 855         return ERR_PTR(error);
 856 }
 857
 858 /*
 859  * Create an NFS4 referral server record
 860  */
 861 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 862                                                struct nfs_fh *mntfh)
 863 {
 864         struct nfs_client *parent_client;
 865         struct nfs_server *server, *parent_server;
 866         int error;
 867
 868         dprintk("--> nfs4_create_referral_server()\n");
 869
 870         server = nfs_alloc_server();
 871         if (!server)
 872                 return ERR_PTR(-ENOMEM);
 873
 874         parent_server = NFS_SB(data->sb);
 875         parent_client = parent_server->nfs_client;
 876
 877         /* Initialise the client representation from the parent server */
 878         nfs_server_copy_userdata(server, parent_server);
 879         server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
 880
 881         /* Get a client representation.
 882          * Note: NFSv4 always uses TCP, */
 883         error = nfs4_set_client(server, data->hostname,
 884                                 data->addr,
 885                                 data->addrlen,
 886                                 parent_client->cl_ipaddr,
 887                                 data->authflavor,
 888                                 rpc_protocol(parent_server->client),
 889                                 parent_server->client->cl_timeout,
 890                                 parent_client->cl_mvops->minor_version,
 891                                 parent_client->cl_net);
 892         if (error < 0)
 893                 goto error;
 894
 895         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 896         if (error < 0)
 897                 goto error;
 898
 899         error = nfs4_server_common_setup(server, mntfh);
 900         if (error < 0)
 901                 goto error;
 902
 903         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 904         return server;
 905
 906 error:
 907         nfs_free_server(server);
 908         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 909         return ERR_PTR(error);
 910 }