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/addr.h>
  10 #include <linux/sunrpc/auth.h>
  11 #include <linux/sunrpc/xprt.h>
  12 #include <linux/sunrpc/bc_xprt.h>
  13 #include "internal.h"
  14 #include "callback.h"
  15 #include "delegation.h"
  16 #include "nfs4session.h"
  17 #include "pnfs.h"
  18 #include "netns.h"
  19
  20 #define NFSDBG_FACILITY         NFSDBG_CLIENT
  21
  22 /*
  23  * Get a unique NFSv4.0 callback identifier which will be used
  24  * by the V4.0 callback service to lookup the nfs_client struct
  25  */
  26 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
  27 {
  28         int ret = 0;
  29         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  30
  31         if (clp->rpc_ops->version != 4 || minorversion != 0)
  32                 return ret;
  33         idr_preload(GFP_KERNEL);
  34         spin_lock(&nn->nfs_client_lock);
  35         ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
  36         if (ret >= 0)
  37                 clp->cl_cb_ident = ret;
  38         spin_unlock(&nn->nfs_client_lock);
  39         idr_preload_end();
  40         return ret < 0 ? ret : 0;
  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         if (clp->cl_minorversion != 0)
 202                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 203         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 204         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
 205         if (error == -EINVAL)
 206                 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_NULL);
 207         if (error < 0)
 208                 goto error;
 209
 210         /* If no clientaddr= option was specified, find a usable cb address */
 211         if (ip_addr == NULL) {
 212                 struct sockaddr_storage cb_addr;
 213                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 214
 215                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 216                 if (error < 0)
 217                         goto error;
 218                 error = rpc_ntop(sap, buf, sizeof(buf));
 219                 if (error < 0)
 220                         goto error;
 221                 ip_addr = (const char *)buf;
 222         }
 223         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 224
 225         error = nfs_idmap_new(clp);
 226         if (error < 0) {
 227                 dprintk("%s: failed to create idmapper. Error = %d\n",
 228                         __func__, error);
 229                 goto error;
 230         }
 231         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 232
 233         error = nfs4_init_client_minor_version(clp);
 234         if (error < 0)
 235                 goto error;
 236
 237         if (!nfs4_has_session(clp))
 238                 nfs_mark_client_ready(clp, NFS_CS_READY);
 239
 240         error = nfs4_discover_server_trunking(clp, &old);
 241         if (error < 0)
 242                 goto error;
 243         nfs_put_client(clp);
 244         if (clp != old) {
 245                 clp->cl_preserve_clid = true;
 246                 clp = old;
 247         }
 248
 249         return clp;
 250
 251 error:
 252         nfs_mark_client_ready(clp, error);
 253         nfs_put_client(clp);
 254         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 255         return ERR_PTR(error);
 256 }
 257
 258 /*
 259  * SETCLIENTID just did a callback update with the callback ident in
 260  * "drop," but server trunking discovery claims "drop" and "keep" are
 261  * actually the same server.  Swap the callback IDs so that "keep"
 262  * will continue to use the callback ident the server now knows about,
 263  * and so that "keep"'s original callback ident is destroyed when
 264  * "drop" is freed.
 265  */
 266 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 267                                       struct nfs_client *drop)
 268 {
 269         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 270         unsigned int save = keep->cl_cb_ident;
 271
 272         if (keep->cl_cb_ident == drop->cl_cb_ident)
 273                 return;
 274
 275         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 276                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 277
 278         spin_lock(&nn->nfs_client_lock);
 279
 280         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 281         keep->cl_cb_ident = drop->cl_cb_ident;
 282
 283         idr_replace(&nn->cb_ident_idr, drop, save);
 284         drop->cl_cb_ident = save;
 285
 286         spin_unlock(&nn->nfs_client_lock);
 287 }
 288
 289 /**
 290  * nfs40_walk_client_list - Find server that recognizes a client ID
 291  *
 292  * @new: nfs_client with client ID to test
 293  * @result: OUT: found nfs_client, or new
 294  * @cred: credential to use for trunking test
 295  *
 296  * Returns zero, a negative errno, or a negative NFS4ERR status.
 297  * If zero is returned, an nfs_client pointer is planted in "result."
 298  *
 299  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 300  *     the last nfs_client on the list.
 301  */
 302 int nfs40_walk_client_list(struct nfs_client *new,
 303                            struct nfs_client **result,
 304                            struct rpc_cred *cred)
 305 {
 306         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 307         struct nfs_client *pos, *prev = NULL;
 308         struct nfs4_setclientid_res clid = {
 309                 .clientid       = new->cl_clientid,
 310                 .confirm        = new->cl_confirm,
 311         };
 312         int status = -NFS4ERR_STALE_CLIENTID;
 313
 314         spin_lock(&nn->nfs_client_lock);
 315         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 316                 /* If "pos" isn't marked ready, we can't trust the
 317                  * remaining fields in "pos" */
 318                 if (pos->cl_cons_state > NFS_CS_READY) {
 319                         atomic_inc(&pos->cl_count);
 320                         spin_unlock(&nn->nfs_client_lock);
 321
 322                         if (prev)
 323                                 nfs_put_client(prev);
 324                         prev = pos;
 325
 326                         status = nfs_wait_client_init_complete(pos);
 327                         spin_lock(&nn->nfs_client_lock);
 328                         if (status < 0)
 329                                 continue;
 330                 }
 331                 if (pos->cl_cons_state != NFS_CS_READY)
 332                         continue;
 333
 334                 if (pos->rpc_ops != new->rpc_ops)
 335                         continue;
 336
 337                 if (pos->cl_proto != new->cl_proto)
 338                         continue;
 339
 340                 if (pos->cl_minorversion != new->cl_minorversion)
 341                         continue;
 342
 343                 if (pos->cl_clientid != new->cl_clientid)
 344                         continue;
 345
 346                 atomic_inc(&pos->cl_count);
 347                 spin_unlock(&nn->nfs_client_lock);
 348
 349                 if (prev)
 350                         nfs_put_client(prev);
 351                 prev = pos;
 352
 353                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 354                 switch (status) {
 355                 case -NFS4ERR_STALE_CLIENTID:
 356                         break;
 357                 case 0:
 358                         nfs4_swap_callback_idents(pos, new);
 359
 360                         prev = NULL;
 361                         *result = pos;
 362                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 363                                 __func__, pos, atomic_read(&pos->cl_count));
 364                 default:
 365                         goto out;
 366                 }
 367
 368                 spin_lock(&nn->nfs_client_lock);
 369         }
 370         spin_unlock(&nn->nfs_client_lock);
 371
 372         /* No match found. The server lost our clientid */
 373 out:
 374         if (prev)
 375                 nfs_put_client(prev);
 376         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 377         return status;
 378 }
 379
 380 #ifdef CONFIG_NFS_V4_1
 381 /*
 382  * Returns true if the client IDs match
 383  */
 384 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 385 {
 386         if (a->cl_clientid != b->cl_clientid) {
 387                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 388                         __func__, a->cl_clientid, b->cl_clientid);
 389                 return false;
 390         }
 391         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 392                 __func__, a->cl_clientid, b->cl_clientid);
 393         return true;
 394 }
 395
 396 /*
 397  * Returns true if the server owners match
 398  */
 399 static bool
 400 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
 401 {
 402         struct nfs41_server_owner *o1 = a->cl_serverowner;
 403         struct nfs41_server_owner *o2 = b->cl_serverowner;
 404
 405         if (o1->minor_id != o2->minor_id) {
 406                 dprintk("NFS: --> %s server owner minor IDs do not match\n",
 407                         __func__);
 408                 return false;
 409         }
 410
 411         if (o1->major_id_sz != o2->major_id_sz)
 412                 goto out_major_mismatch;
 413         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 414                 goto out_major_mismatch;
 415
 416         dprintk("NFS: --> %s server owners match\n", __func__);
 417         return true;
 418
 419 out_major_mismatch:
 420         dprintk("NFS: --> %s server owner major IDs do not match\n",
 421                 __func__);
 422         return false;
 423 }
 424
 425 /**
 426  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 427  *
 428  * @new: nfs_client with client ID to test
 429  * @result: OUT: found nfs_client, or new
 430  * @cred: credential to use for trunking test
 431  *
 432  * Returns zero, a negative errno, or a negative NFS4ERR status.
 433  * If zero is returned, an nfs_client pointer is planted in "result."
 434  *
 435  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 436  *     the last nfs_client on the list.
 437  */
 438 int nfs41_walk_client_list(struct nfs_client *new,
 439                            struct nfs_client **result,
 440                            struct rpc_cred *cred)
 441 {
 442         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 443         struct nfs_client *pos, *prev = NULL;
 444         int status = -NFS4ERR_STALE_CLIENTID;
 445
 446         spin_lock(&nn->nfs_client_lock);
 447         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 448                 /* If "pos" isn't marked ready, we can't trust the
 449                  * remaining fields in "pos", especially the client
 450                  * ID and serverowner fields.  Wait for CREATE_SESSION
 451                  * to finish. */
 452                 if (pos->cl_cons_state > NFS_CS_READY) {
 453                         atomic_inc(&pos->cl_count);
 454                         spin_unlock(&nn->nfs_client_lock);
 455
 456                         if (prev)
 457                                 nfs_put_client(prev);
 458                         prev = pos;
 459
 460                         status = nfs_wait_client_init_complete(pos);
 461                         if (status == 0) {
 462                                 nfs4_schedule_lease_recovery(pos);
 463                                 status = nfs4_wait_clnt_recover(pos);
 464                         }
 465                         spin_lock(&nn->nfs_client_lock);
 466                         if (status < 0)
 467                                 continue;
 468                 }
 469                 if (pos->cl_cons_state != NFS_CS_READY)
 470                         continue;
 471
 472                 if (pos->rpc_ops != new->rpc_ops)
 473                         continue;
 474
 475                 if (pos->cl_proto != new->cl_proto)
 476                         continue;
 477
 478                 if (pos->cl_minorversion != new->cl_minorversion)
 479                         continue;
 480
 481                 if (!nfs4_match_clientids(pos, new))
 482                         continue;
 483
 484                 if (!nfs4_match_serverowners(pos, new))
 485                         continue;
 486
 487                 atomic_inc(&pos->cl_count);
 488                 *result = pos;
 489                 status = 0;
 490                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 491                         __func__, pos, atomic_read(&pos->cl_count));
 492                 break;
 493         }
 494
 495         /* No matching nfs_client found. */
 496         spin_unlock(&nn->nfs_client_lock);
 497         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 498         if (prev)
 499                 nfs_put_client(prev);
 500         return status;
 501 }
 502 #endif  /* CONFIG_NFS_V4_1 */
 503
 504 static void nfs4_destroy_server(struct nfs_server *server)
 505 {
 506         nfs_server_return_all_delegations(server);
 507         unset_pnfs_layoutdriver(server);
 508         nfs4_purge_state_owners(server);
 509 }
 510
 511 /*
 512  * NFSv4.0 callback thread helper
 513  *
 514  * Find a client by callback identifier
 515  */
 516 struct nfs_client *
 517 nfs4_find_client_ident(struct net *net, int cb_ident)
 518 {
 519         struct nfs_client *clp;
 520         struct nfs_net *nn = net_generic(net, nfs_net_id);
 521
 522         spin_lock(&nn->nfs_client_lock);
 523         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 524         if (clp)
 525                 atomic_inc(&clp->cl_count);
 526         spin_unlock(&nn->nfs_client_lock);
 527         return clp;
 528 }
 529
 530 #if defined(CONFIG_NFS_V4_1)
 531 /* Common match routine for v4.0 and v4.1 callback services */
 532 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 533                 struct nfs_client *clp, u32 minorversion)
 534 {
 535         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 536
 537         /* Don't match clients that failed to initialise */
 538         if (!(clp->cl_cons_state == NFS_CS_READY ||
 539             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 540                 return false;
 541
 542         smp_rmb();
 543
 544         /* Match the version and minorversion */
 545         if (clp->rpc_ops->version != 4 ||
 546             clp->cl_minorversion != minorversion)
 547                 return false;
 548
 549         /* Match only the IP address, not the port number */
 550         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 551                 return false;
 552
 553         return true;
 554 }
 555
 556 /*
 557  * NFSv4.1 callback thread helper
 558  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 559  * minorversion, and sessionID
 560  *
 561  * Returns NULL if no such client
 562  */
 563 struct nfs_client *
 564 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 565                            struct nfs4_sessionid *sid)
 566 {
 567         struct nfs_client *clp;
 568         struct nfs_net *nn = net_generic(net, nfs_net_id);
 569
 570         spin_lock(&nn->nfs_client_lock);
 571         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 572                 if (nfs4_cb_match_client(addr, clp, 1) == false)
 573                         continue;
 574
 575                 if (!nfs4_has_session(clp))
 576                         continue;
 577
 578                 /* Match sessionid*/
 579                 if (memcmp(clp->cl_session->sess_id.data,
 580                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 581                         continue;
 582
 583                 atomic_inc(&clp->cl_count);
 584                 spin_unlock(&nn->nfs_client_lock);
 585                 return clp;
 586         }
 587         spin_unlock(&nn->nfs_client_lock);
 588         return NULL;
 589 }
 590
 591 #else /* CONFIG_NFS_V4_1 */
 592
 593 struct nfs_client *
 594 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 595                            struct nfs4_sessionid *sid)
 596 {
 597         return NULL;
 598 }
 599 #endif /* CONFIG_NFS_V4_1 */
 600
 601 /*
 602  * Set up an NFS4 client
 603  */
 604 static int nfs4_set_client(struct nfs_server *server,
 605                 const char *hostname,
 606                 const struct sockaddr *addr,
 607                 const size_t addrlen,
 608                 const char *ip_addr,
 609                 rpc_authflavor_t authflavour,
 610                 int proto, const struct rpc_timeout *timeparms,
 611                 u32 minorversion, struct net *net)
 612 {
 613         struct nfs_client_initdata cl_init = {
 614                 .hostname = hostname,
 615                 .addr = addr,
 616                 .addrlen = addrlen,
 617                 .nfs_mod = &nfs_v4,
 618                 .proto = proto,
 619                 .minorversion = minorversion,
 620                 .net = net,
 621         };
 622         struct nfs_client *clp;
 623         int error;
 624
 625         dprintk("--> nfs4_set_client()\n");
 626
 627         if (server->flags & NFS_MOUNT_NORESVPORT)
 628                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 629
 630         /* Allocate or find a client reference we can use */
 631         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 632         if (IS_ERR(clp)) {
 633                 error = PTR_ERR(clp);
 634                 goto error;
 635         }
 636
 637         /*
 638          * Query for the lease time on clientid setup or renewal
 639          *
 640          * Note that this will be set on nfs_clients that were created
 641          * only for the DS role and did not set this bit, but now will
 642          * serve a dual role.
 643          */
 644         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 645
 646         server->nfs_client = clp;
 647         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 648         return 0;
 649 error:
 650         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 651         return error;
 652 }
 653
 654 /*
 655  * Set up a pNFS Data Server client.
 656  *
 657  * Return any existing nfs_client that matches server address,port,version
 658  * and minorversion.
 659  *
 660  * For a new nfs_client, use a soft mount (default), a low retrans and a
 661  * low timeout interval so that if a connection is lost, we retry through
 662  * the MDS.
 663  */
 664 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 665                 const struct sockaddr *ds_addr, int ds_addrlen,
 666                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 667 {
 668         struct nfs_client_initdata cl_init = {
 669                 .addr = ds_addr,
 670                 .addrlen = ds_addrlen,
 671                 .nfs_mod = &nfs_v4,
 672                 .proto = ds_proto,
 673                 .minorversion = mds_clp->cl_minorversion,
 674                 .net = mds_clp->cl_net,
 675         };
 676         struct rpc_timeout ds_timeout;
 677         struct nfs_client *clp;
 678
 679         /*
 680          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 681          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 682          * (section 13.1 RFC 5661).
 683          */
 684         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 685         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 686                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 687
 688         dprintk("<-- %s %p\n", __func__, clp);
 689         return clp;
 690 }
 691 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 692
 693 /*
 694  * Session has been established, and the client marked ready.
 695  * Set the mount rsize and wsize with negotiated fore channel
 696  * attributes which will be bound checked in nfs_server_set_fsinfo.
 697  */
 698 static void nfs4_session_set_rwsize(struct nfs_server *server)
 699 {
 700 #ifdef CONFIG_NFS_V4_1
 701         struct nfs4_session *sess;
 702         u32 server_resp_sz;
 703         u32 server_rqst_sz;
 704
 705         if (!nfs4_has_session(server->nfs_client))
 706                 return;
 707         sess = server->nfs_client->cl_session;
 708         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 709         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 710
 711         if (server->rsize > server_resp_sz)
 712                 server->rsize = server_resp_sz;
 713         if (server->wsize > server_rqst_sz)
 714                 server->wsize = server_rqst_sz;
 715 #endif /* CONFIG_NFS_V4_1 */
 716 }
 717
 718 static int nfs4_server_common_setup(struct nfs_server *server,
 719                 struct nfs_fh *mntfh)
 720 {
 721         struct nfs_fattr *fattr;
 722         int error;
 723
 724         /* data servers support only a subset of NFSv4.1 */
 725         if (is_ds_only_client(server->nfs_client))
 726                 return -EPROTONOSUPPORT;
 727
 728         fattr = nfs_alloc_fattr();
 729         if (fattr == NULL)
 730                 return -ENOMEM;
 731
 732         /* We must ensure the session is initialised first */
 733         error = nfs4_init_session(server);
 734         if (error < 0)
 735                 goto out;
 736
 737         /* Set the basic capabilities */
 738         server->caps |= server->nfs_client->cl_mvops->init_caps;
 739         if (server->flags & NFS_MOUNT_NORDIRPLUS)
 740                         server->caps &= ~NFS_CAP_READDIRPLUS;
 741         /*
 742          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 743          * authentication.
 744          */
 745         if (nfs4_disable_idmapping &&
 746                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 747                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 748
 749
 750         /* Probe the root fh to retrieve its FSID and filehandle */
 751         error = nfs4_get_rootfh(server, mntfh);
 752         if (error < 0)
 753                 goto out;
 754
 755         dprintk("Server FSID: %llx:%llx\n",
 756                         (unsigned long long) server->fsid.major,
 757                         (unsigned long long) server->fsid.minor);
 758         dprintk("Mount FH: %d\n", mntfh->size);
 759
 760         nfs4_session_set_rwsize(server);
 761
 762         error = nfs_probe_fsinfo(server, mntfh, fattr);
 763         if (error < 0)
 764                 goto out;
 765
 766         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 767                 server->namelen = NFS4_MAXNAMLEN;
 768
 769         nfs_server_insert_lists(server);
 770         server->mount_time = jiffies;
 771         server->destroy = nfs4_destroy_server;
 772 out:
 773         nfs_free_fattr(fattr);
 774         return error;
 775 }
 776
 777 /*
 778  * Create a version 4 volume record
 779  */
 780 static int nfs4_init_server(struct nfs_server *server,
 781                 const struct nfs_parsed_mount_data *data)
 782 {
 783         struct rpc_timeout timeparms;
 784         int error;
 785
 786         dprintk("--> nfs4_init_server()\n");
 787
 788         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 789                         data->timeo, data->retrans);
 790
 791         /* Initialise the client representation from the mount data */
 792         server->flags = data->flags;
 793         server->options = data->options;
 794
 795         /* Get a client record */
 796         error = nfs4_set_client(server,
 797                         data->nfs_server.hostname,
 798                         (const struct sockaddr *)&data->nfs_server.address,
 799                         data->nfs_server.addrlen,
 800                         data->client_address,
 801                         data->auth_flavors[0],
 802                         data->nfs_server.protocol,
 803                         &timeparms,
 804                         data->minorversion,
 805                         data->net);
 806         if (error < 0)
 807                 goto error;
 808
 809         if (data->rsize)
 810                 server->rsize = nfs_block_size(data->rsize, NULL);
 811         if (data->wsize)
 812                 server->wsize = nfs_block_size(data->wsize, NULL);
 813
 814         server->acregmin = data->acregmin * HZ;
 815         server->acregmax = data->acregmax * HZ;
 816         server->acdirmin = data->acdirmin * HZ;
 817         server->acdirmax = data->acdirmax * HZ;
 818
 819         server->port = data->nfs_server.port;
 820
 821         error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
 822
 823 error:
 824         /* Done */
 825         dprintk("<-- nfs4_init_server() = %d\n", error);
 826         return error;
 827 }
 828
 829 /*
 830  * Create a version 4 volume record
 831  * - keyed on server and FSID
 832  */
 833 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
 834                                       struct nfs_fh *mntfh)*/
 835 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
 836                                       struct nfs_subversion *nfs_mod)
 837 {
 838         struct nfs_server *server;
 839         int error;
 840
 841         dprintk("--> nfs4_create_server()\n");
 842
 843         server = nfs_alloc_server();
 844         if (!server)
 845                 return ERR_PTR(-ENOMEM);
 846
 847         /* set up the general RPC client */
 848         error = nfs4_init_server(server, mount_info->parsed);
 849         if (error < 0)
 850                 goto error;
 851
 852         error = nfs4_server_common_setup(server, mount_info->mntfh);
 853         if (error < 0)
 854                 goto error;
 855
 856         dprintk("<-- nfs4_create_server() = %p\n", server);
 857         return server;
 858
 859 error:
 860         nfs_free_server(server);
 861         dprintk("<-- nfs4_create_server() = error %d\n", error);
 862         return ERR_PTR(error);
 863 }
 864
 865 /*
 866  * Create an NFS4 referral server record
 867  */
 868 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
 869                                                struct nfs_fh *mntfh)
 870 {
 871         struct nfs_client *parent_client;
 872         struct nfs_server *server, *parent_server;
 873         int error;
 874
 875         dprintk("--> nfs4_create_referral_server()\n");
 876
 877         server = nfs_alloc_server();
 878         if (!server)
 879                 return ERR_PTR(-ENOMEM);
 880
 881         parent_server = NFS_SB(data->sb);
 882         parent_client = parent_server->nfs_client;
 883
 884         /* Initialise the client representation from the parent server */
 885         nfs_server_copy_userdata(server, parent_server);
 886
 887         /* Get a client representation.
 888          * Note: NFSv4 always uses TCP, */
 889         error = nfs4_set_client(server, data->hostname,
 890                                 data->addr,
 891                                 data->addrlen,
 892                                 parent_client->cl_ipaddr,
 893                                 data->authflavor,
 894                                 rpc_protocol(parent_server->client),
 895                                 parent_server->client->cl_timeout,
 896                                 parent_client->cl_mvops->minor_version,
 897                                 parent_client->cl_net);
 898         if (error < 0)
 899                 goto error;
 900
 901         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
 902         if (error < 0)
 903                 goto error;
 904
 905         error = nfs4_server_common_setup(server, mntfh);
 906         if (error < 0)
 907                 goto error;
 908
 909         dprintk("<-- nfs_create_referral_server() = %p\n", server);
 910         return server;
 911
 912 error:
 913         nfs_free_server(server);
 914         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
 915         return ERR_PTR(error);
 916 }