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 /**
  45  * Per auth flavor data server rpc clients
  46  */
  47 struct nfs4_ds_server {
  48         struct list_head        list;   /* ds_clp->cl_ds_clients */
  49         struct rpc_clnt         *rpc_clnt;
  50 };
  51
  52 /**
  53  * Common lookup case for DS I/O
  54  */
  55 static struct nfs4_ds_server *
  56 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  57 {
  58         struct nfs4_ds_server *dss;
  59
  60         rcu_read_lock();
  61         list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
  62                 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  63                         continue;
  64                 goto out;
  65         }
  66         dss = NULL;
  67 out:
  68         rcu_read_unlock();
  69         return dss;
  70 }
  71
  72 static struct nfs4_ds_server *
  73 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
  74                            struct nfs4_ds_server *new)
  75 {
  76         struct nfs4_ds_server *dss;
  77
  78         spin_lock(&ds_clp->cl_lock);
  79         list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
  80                 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
  81                         continue;
  82                 goto out;
  83         }
  84         if (new)
  85                 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
  86         dss = new;
  87 out:
  88         spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
  89         return dss;
  90 }
  91
  92 static struct nfs4_ds_server *
  93 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
  94 {
  95         struct nfs4_ds_server *dss;
  96
  97         dss = kmalloc(sizeof(*dss), GFP_NOFS);
  98         if (dss == NULL)
  99                 return ERR_PTR(-ENOMEM);
 100
 101         dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
 102         if (IS_ERR(dss->rpc_clnt)) {
 103                 int err = PTR_ERR(dss->rpc_clnt);
 104                 kfree (dss);
 105                 return ERR_PTR(err);
 106         }
 107         INIT_LIST_HEAD(&dss->list);
 108
 109         return dss;
 110 }
 111
 112 static void
 113 nfs4_free_ds_server(struct nfs4_ds_server *dss)
 114 {
 115         rpc_release_client(dss->rpc_clnt);
 116         kfree(dss);
 117 }
 118
 119 /**
 120 * Find or create a DS rpc client with th MDS server rpc client auth flavor
 121 * in the nfs_client cl_ds_clients list.
 122 */
 123 struct rpc_clnt *
 124 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
 125 {
 126         struct nfs4_ds_server *dss, *new;
 127         rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
 128
 129         dss = nfs4_find_ds_client(ds_clp, flavor);
 130         if (dss != NULL)
 131                 goto out;
 132         new = nfs4_alloc_ds_server(ds_clp, flavor);
 133         if (IS_ERR(new))
 134                 return ERR_CAST(new);
 135         dss = nfs4_add_ds_client(ds_clp, flavor, new);
 136         if (dss != new)
 137                 nfs4_free_ds_server(new);
 138 out:
 139         return dss->rpc_clnt;
 140 }
 141 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
 142
 143 static void
 144 nfs4_shutdown_ds_clients(struct nfs_client *clp)
 145 {
 146         struct nfs4_ds_server *dss;
 147         LIST_HEAD(shutdown_list);
 148
 149         while (!list_empty(&clp->cl_ds_clients)) {
 150                 dss = list_entry(clp->cl_ds_clients.next,
 151                                         struct nfs4_ds_server, list);
 152                 list_del(&dss->list);
 153                 rpc_shutdown_client(dss->rpc_clnt);
 154                 kfree (dss);
 155         }
 156 }
 157
 158 void nfs41_shutdown_client(struct nfs_client *clp)
 159 {
 160         if (nfs4_has_session(clp)) {
 161                 nfs4_shutdown_ds_clients(clp);
 162                 nfs4_destroy_session(clp->cl_session);
 163                 nfs4_destroy_clientid(clp);
 164         }
 165
 166 }
 167 #endif  /* CONFIG_NFS_V4_1 */
 168
 169 void nfs40_shutdown_client(struct nfs_client *clp)
 170 {
 171         if (clp->cl_slot_tbl) {
 172                 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
 173                 kfree(clp->cl_slot_tbl);
 174         }
 175 }
 176
 177 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 178 {
 179         int err;
 180         struct nfs_client *clp = nfs_alloc_client(cl_init);
 181         if (IS_ERR(clp))
 182                 return clp;
 183
 184         err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
 185         if (err)
 186                 goto error;
 187
 188         if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
 189                 err = -EINVAL;
 190                 goto error;
 191         }
 192
 193         spin_lock_init(&clp->cl_lock);
 194         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
 195         INIT_LIST_HEAD(&clp->cl_ds_clients);
 196         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
 197         clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 198         clp->cl_minorversion = cl_init->minorversion;
 199         clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
 200         return clp;
 201
 202 error:
 203         nfs_free_client(clp);
 204         return ERR_PTR(err);
 205 }
 206
 207 /*
 208  * Destroy the NFS4 callback service
 209  */
 210 static void nfs4_destroy_callback(struct nfs_client *clp)
 211 {
 212         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
 213                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
 214 }
 215
 216 static void nfs4_shutdown_client(struct nfs_client *clp)
 217 {
 218         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
 219                 nfs4_kill_renewd(clp);
 220         clp->cl_mvops->shutdown_client(clp);
 221         nfs4_destroy_callback(clp);
 222         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
 223                 nfs_idmap_delete(clp);
 224
 225         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 226         kfree(clp->cl_serverowner);
 227         kfree(clp->cl_serverscope);
 228         kfree(clp->cl_implid);
 229 }
 230
 231 void nfs4_free_client(struct nfs_client *clp)
 232 {
 233         nfs4_shutdown_client(clp);
 234         nfs_free_client(clp);
 235 }
 236
 237 /*
 238  * Initialize the NFS4 callback service
 239  */
 240 static int nfs4_init_callback(struct nfs_client *clp)
 241 {
 242         int error;
 243
 244         if (clp->rpc_ops->version == 4) {
 245                 struct rpc_xprt *xprt;
 246
 247                 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
 248
 249                 if (nfs4_has_session(clp)) {
 250                         error = xprt_setup_backchannel(xprt,
 251                                                 NFS41_BC_MIN_CALLBACKS);
 252                         if (error < 0)
 253                                 return error;
 254                 }
 255
 256                 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
 257                 if (error < 0) {
 258                         dprintk("%s: failed to start callback. Error = %d\n",
 259                                 __func__, error);
 260                         return error;
 261                 }
 262                 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
 263         }
 264         return 0;
 265 }
 266
 267 /**
 268  * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
 269  * @clp - nfs_client to initialize
 270  *
 271  * Returns zero on success, or a negative errno if some error occurred.
 272  */
 273 int nfs40_init_client(struct nfs_client *clp)
 274 {
 275         struct nfs4_slot_table *tbl;
 276         int ret;
 277
 278         tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
 279         if (tbl == NULL)
 280                 return -ENOMEM;
 281
 282         ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
 283                                         "NFSv4.0 transport Slot table");
 284         if (ret) {
 285                 kfree(tbl);
 286                 return ret;
 287         }
 288
 289         clp->cl_slot_tbl = tbl;
 290         return 0;
 291 }
 292
 293 #if defined(CONFIG_NFS_V4_1)
 294
 295 /**
 296  * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
 297  * @clp - nfs_client to initialize
 298  *
 299  * Returns zero on success, or a negative errno if some error occurred.
 300  */
 301 int nfs41_init_client(struct nfs_client *clp)
 302 {
 303         struct nfs4_session *session = NULL;
 304
 305         /*
 306          * Create the session and mark it expired.
 307          * When a SEQUENCE operation encounters the expired session
 308          * it will do session recovery to initialize it.
 309          */
 310         session = nfs4_alloc_session(clp);
 311         if (!session)
 312                 return -ENOMEM;
 313
 314         clp->cl_session = session;
 315
 316         /*
 317          * The create session reply races with the server back
 318          * channel probe. Mark the client NFS_CS_SESSION_INITING
 319          * so that the client back channel can find the
 320          * nfs_client struct
 321          */
 322         nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
 323         return 0;
 324 }
 325
 326 #endif  /* CONFIG_NFS_V4_1 */
 327
 328 /*
 329  * Initialize the minor version specific parts of an NFS4 client record
 330  */
 331 static int nfs4_init_client_minor_version(struct nfs_client *clp)
 332 {
 333         int ret;
 334
 335         ret = clp->cl_mvops->init_client(clp);
 336         if (ret)
 337                 return ret;
 338         return nfs4_init_callback(clp);
 339 }
 340
 341 /**
 342  * nfs4_init_client - Initialise an NFS4 client record
 343  *
 344  * @clp: nfs_client to initialise
 345  * @timeparms: timeout parameters for underlying RPC transport
 346  * @ip_addr: callback IP address in presentation format
 347  * @authflavor: authentication flavor for underlying RPC transport
 348  *
 349  * Returns pointer to an NFS client, or an ERR_PTR value.
 350  */
 351 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 352                                     const struct rpc_timeout *timeparms,
 353                                     const char *ip_addr)
 354 {
 355         char buf[INET6_ADDRSTRLEN + 1];
 356         struct nfs_client *old;
 357         int error;
 358
 359         if (clp->cl_cons_state == NFS_CS_READY) {
 360                 /* the client is initialised already */
 361                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
 362                 return clp;
 363         }
 364
 365         /* Check NFS protocol revision and initialize RPC op vector */
 366         clp->rpc_ops = &nfs_v4_clientops;
 367
 368         if (clp->cl_minorversion != 0)
 369                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
 370         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
 371         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
 372         if (error == -EINVAL)
 373                 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
 374         if (error < 0)
 375                 goto error;
 376
 377         /* If no clientaddr= option was specified, find a usable cb address */
 378         if (ip_addr == NULL) {
 379                 struct sockaddr_storage cb_addr;
 380                 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
 381
 382                 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
 383                 if (error < 0)
 384                         goto error;
 385                 error = rpc_ntop(sap, buf, sizeof(buf));
 386                 if (error < 0)
 387                         goto error;
 388                 ip_addr = (const char *)buf;
 389         }
 390         strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
 391
 392         error = nfs_idmap_new(clp);
 393         if (error < 0) {
 394                 dprintk("%s: failed to create idmapper. Error = %d\n",
 395                         __func__, error);
 396                 goto error;
 397         }
 398         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 399
 400         error = nfs4_init_client_minor_version(clp);
 401         if (error < 0)
 402                 goto error;
 403
 404         if (!nfs4_has_session(clp))
 405                 nfs_mark_client_ready(clp, NFS_CS_READY);
 406
 407         error = nfs4_discover_server_trunking(clp, &old);
 408         if (error < 0)
 409                 goto error;
 410
 411         if (clp != old)
 412                 clp->cl_preserve_clid = true;
 413         nfs_put_client(clp);
 414         return old;
 415
 416 error:
 417         nfs_mark_client_ready(clp, error);
 418         nfs_put_client(clp);
 419         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
 420         return ERR_PTR(error);
 421 }
 422
 423 /*
 424  * SETCLIENTID just did a callback update with the callback ident in
 425  * "drop," but server trunking discovery claims "drop" and "keep" are
 426  * actually the same server.  Swap the callback IDs so that "keep"
 427  * will continue to use the callback ident the server now knows about,
 428  * and so that "keep"'s original callback ident is destroyed when
 429  * "drop" is freed.
 430  */
 431 static void nfs4_swap_callback_idents(struct nfs_client *keep,
 432                                       struct nfs_client *drop)
 433 {
 434         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
 435         unsigned int save = keep->cl_cb_ident;
 436
 437         if (keep->cl_cb_ident == drop->cl_cb_ident)
 438                 return;
 439
 440         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
 441                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
 442
 443         spin_lock(&nn->nfs_client_lock);
 444
 445         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
 446         keep->cl_cb_ident = drop->cl_cb_ident;
 447
 448         idr_replace(&nn->cb_ident_idr, drop, save);
 449         drop->cl_cb_ident = save;
 450
 451         spin_unlock(&nn->nfs_client_lock);
 452 }
 453
 454 /**
 455  * nfs40_walk_client_list - Find server that recognizes a client ID
 456  *
 457  * @new: nfs_client with client ID to test
 458  * @result: OUT: found nfs_client, or new
 459  * @cred: credential to use for trunking test
 460  *
 461  * Returns zero, a negative errno, or a negative NFS4ERR status.
 462  * If zero is returned, an nfs_client pointer is planted in "result."
 463  *
 464  * NB: nfs40_walk_client_list() relies on the new nfs_client being
 465  *     the last nfs_client on the list.
 466  */
 467 int nfs40_walk_client_list(struct nfs_client *new,
 468                            struct nfs_client **result,
 469                            struct rpc_cred *cred)
 470 {
 471         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 472         struct nfs_client *pos, *prev = NULL;
 473         struct nfs4_setclientid_res clid = {
 474                 .clientid       = new->cl_clientid,
 475                 .confirm        = new->cl_confirm,
 476         };
 477         int status = -NFS4ERR_STALE_CLIENTID;
 478
 479         spin_lock(&nn->nfs_client_lock);
 480         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 481
 482                 if (pos->rpc_ops != new->rpc_ops)
 483                         continue;
 484
 485                 if (pos->cl_proto != new->cl_proto)
 486                         continue;
 487
 488                 if (pos->cl_minorversion != new->cl_minorversion)
 489                         continue;
 490
 491                 /* If "pos" isn't marked ready, we can't trust the
 492                  * remaining fields in "pos" */
 493                 if (pos->cl_cons_state > NFS_CS_READY) {
 494                         atomic_inc(&pos->cl_count);
 495                         spin_unlock(&nn->nfs_client_lock);
 496
 497                         if (prev)
 498                                 nfs_put_client(prev);
 499                         prev = pos;
 500
 501                         status = nfs_wait_client_init_complete(pos);
 502                         if (status < 0)
 503                                 goto out;
 504                         status = -NFS4ERR_STALE_CLIENTID;
 505                         spin_lock(&nn->nfs_client_lock);
 506                 }
 507                 if (pos->cl_cons_state != NFS_CS_READY)
 508                         continue;
 509
 510                 if (pos->cl_clientid != new->cl_clientid)
 511                         continue;
 512
 513                 atomic_inc(&pos->cl_count);
 514                 spin_unlock(&nn->nfs_client_lock);
 515
 516                 if (prev)
 517                         nfs_put_client(prev);
 518                 prev = pos;
 519
 520                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
 521                 switch (status) {
 522                 case -NFS4ERR_STALE_CLIENTID:
 523                         break;
 524                 case 0:
 525                         nfs4_swap_callback_idents(pos, new);
 526
 527                         prev = NULL;
 528                         *result = pos;
 529                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 530                                 __func__, pos, atomic_read(&pos->cl_count));
 531                 default:
 532                         goto out;
 533                 }
 534
 535                 spin_lock(&nn->nfs_client_lock);
 536         }
 537         spin_unlock(&nn->nfs_client_lock);
 538
 539         /* No match found. The server lost our clientid */
 540 out:
 541         if (prev)
 542                 nfs_put_client(prev);
 543         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 544         return status;
 545 }
 546
 547 #ifdef CONFIG_NFS_V4_1
 548 /*
 549  * Returns true if the client IDs match
 550  */
 551 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
 552 {
 553         if (a->cl_clientid != b->cl_clientid) {
 554                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
 555                         __func__, a->cl_clientid, b->cl_clientid);
 556                 return false;
 557         }
 558         dprintk("NFS: --> %s client ID %llx matches %llx\n",
 559                 __func__, a->cl_clientid, b->cl_clientid);
 560         return true;
 561 }
 562
 563 /*
 564  * Returns true if the server major ids match
 565  */
 566 static bool
 567 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
 568 {
 569         struct nfs41_server_owner *o1 = a->cl_serverowner;
 570         struct nfs41_server_owner *o2 = b->cl_serverowner;
 571
 572         if (o1->major_id_sz != o2->major_id_sz)
 573                 goto out_major_mismatch;
 574         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
 575                 goto out_major_mismatch;
 576
 577         dprintk("NFS: --> %s server owners match\n", __func__);
 578         return true;
 579
 580 out_major_mismatch:
 581         dprintk("NFS: --> %s server owner major IDs do not match\n",
 582                 __func__);
 583         return false;
 584 }
 585
 586 /**
 587  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
 588  *
 589  * @new: nfs_client with client ID to test
 590  * @result: OUT: found nfs_client, or new
 591  * @cred: credential to use for trunking test
 592  *
 593  * Returns zero, a negative errno, or a negative NFS4ERR status.
 594  * If zero is returned, an nfs_client pointer is planted in "result."
 595  *
 596  * NB: nfs41_walk_client_list() relies on the new nfs_client being
 597  *     the last nfs_client on the list.
 598  */
 599 int nfs41_walk_client_list(struct nfs_client *new,
 600                            struct nfs_client **result,
 601                            struct rpc_cred *cred)
 602 {
 603         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
 604         struct nfs_client *pos, *prev = NULL;
 605         int status = -NFS4ERR_STALE_CLIENTID;
 606
 607         spin_lock(&nn->nfs_client_lock);
 608         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
 609
 610                 if (pos->rpc_ops != new->rpc_ops)
 611                         continue;
 612
 613                 if (pos->cl_proto != new->cl_proto)
 614                         continue;
 615
 616                 if (pos->cl_minorversion != new->cl_minorversion)
 617                         continue;
 618
 619                 /* If "pos" isn't marked ready, we can't trust the
 620                  * remaining fields in "pos", especially the client
 621                  * ID and serverowner fields.  Wait for CREATE_SESSION
 622                  * to finish. */
 623                 if (pos->cl_cons_state > NFS_CS_READY) {
 624                         atomic_inc(&pos->cl_count);
 625                         spin_unlock(&nn->nfs_client_lock);
 626
 627                         if (prev)
 628                                 nfs_put_client(prev);
 629                         prev = pos;
 630
 631                         status = nfs_wait_client_init_complete(pos);
 632                         if (pos->cl_cons_state == NFS_CS_SESSION_INITING) {
 633                                 nfs4_schedule_lease_recovery(pos);
 634                                 status = nfs4_wait_clnt_recover(pos);
 635                         }
 636                         spin_lock(&nn->nfs_client_lock);
 637                         if (status < 0)
 638                                 break;
 639                         status = -NFS4ERR_STALE_CLIENTID;
 640                 }
 641                 if (pos->cl_cons_state != NFS_CS_READY)
 642                         continue;
 643
 644                 if (!nfs4_match_clientids(pos, new))
 645                         continue;
 646
 647                 /*
 648                  * Note that session trunking is just a special subcase of
 649                  * client id trunking. In either case, we want to fall back
 650                  * to using the existing nfs_client.
 651                  */
 652                 if (!nfs4_check_clientid_trunking(pos, new))
 653                         continue;
 654
 655                 atomic_inc(&pos->cl_count);
 656                 *result = pos;
 657                 status = 0;
 658                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
 659                         __func__, pos, atomic_read(&pos->cl_count));
 660                 break;
 661         }
 662
 663         /* No matching nfs_client found. */
 664         spin_unlock(&nn->nfs_client_lock);
 665         dprintk("NFS: <-- %s status = %d\n", __func__, status);
 666         if (prev)
 667                 nfs_put_client(prev);
 668         return status;
 669 }
 670 #endif  /* CONFIG_NFS_V4_1 */
 671
 672 static void nfs4_destroy_server(struct nfs_server *server)
 673 {
 674         nfs_server_return_all_delegations(server);
 675         unset_pnfs_layoutdriver(server);
 676         nfs4_purge_state_owners(server);
 677 }
 678
 679 /*
 680  * NFSv4.0 callback thread helper
 681  *
 682  * Find a client by callback identifier
 683  */
 684 struct nfs_client *
 685 nfs4_find_client_ident(struct net *net, int cb_ident)
 686 {
 687         struct nfs_client *clp;
 688         struct nfs_net *nn = net_generic(net, nfs_net_id);
 689
 690         spin_lock(&nn->nfs_client_lock);
 691         clp = idr_find(&nn->cb_ident_idr, cb_ident);
 692         if (clp)
 693                 atomic_inc(&clp->cl_count);
 694         spin_unlock(&nn->nfs_client_lock);
 695         return clp;
 696 }
 697
 698 #if defined(CONFIG_NFS_V4_1)
 699 /* Common match routine for v4.0 and v4.1 callback services */
 700 static bool nfs4_cb_match_client(const struct sockaddr *addr,
 701                 struct nfs_client *clp, u32 minorversion)
 702 {
 703         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 704
 705         /* Don't match clients that failed to initialise */
 706         if (!(clp->cl_cons_state == NFS_CS_READY ||
 707             clp->cl_cons_state == NFS_CS_SESSION_INITING))
 708                 return false;
 709
 710         smp_rmb();
 711
 712         /* Match the version and minorversion */
 713         if (clp->rpc_ops->version != 4 ||
 714             clp->cl_minorversion != minorversion)
 715                 return false;
 716
 717         /* Match only the IP address, not the port number */
 718         if (!nfs_sockaddr_match_ipaddr(addr, clap))
 719                 return false;
 720
 721         return true;
 722 }
 723
 724 /*
 725  * NFSv4.1 callback thread helper
 726  * For CB_COMPOUND calls, find a client by IP address, protocol version,
 727  * minorversion, and sessionID
 728  *
 729  * Returns NULL if no such client
 730  */
 731 struct nfs_client *
 732 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 733                            struct nfs4_sessionid *sid, u32 minorversion)
 734 {
 735         struct nfs_client *clp;
 736         struct nfs_net *nn = net_generic(net, nfs_net_id);
 737
 738         spin_lock(&nn->nfs_client_lock);
 739         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
 740                 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
 741                         continue;
 742
 743                 if (!nfs4_has_session(clp))
 744                         continue;
 745
 746                 /* Match sessionid*/
 747                 if (memcmp(clp->cl_session->sess_id.data,
 748                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
 749                         continue;
 750
 751                 atomic_inc(&clp->cl_count);
 752                 spin_unlock(&nn->nfs_client_lock);
 753                 return clp;
 754         }
 755         spin_unlock(&nn->nfs_client_lock);
 756         return NULL;
 757 }
 758
 759 #else /* CONFIG_NFS_V4_1 */
 760
 761 struct nfs_client *
 762 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
 763                            struct nfs4_sessionid *sid, u32 minorversion)
 764 {
 765         return NULL;
 766 }
 767 #endif /* CONFIG_NFS_V4_1 */
 768
 769 /*
 770  * Set up an NFS4 client
 771  */
 772 static int nfs4_set_client(struct nfs_server *server,
 773                 const char *hostname,
 774                 const struct sockaddr *addr,
 775                 const size_t addrlen,
 776                 const char *ip_addr,
 777                 rpc_authflavor_t authflavour,
 778                 int proto, const struct rpc_timeout *timeparms,
 779                 u32 minorversion, struct net *net)
 780 {
 781         struct nfs_client_initdata cl_init = {
 782                 .hostname = hostname,
 783                 .addr = addr,
 784                 .addrlen = addrlen,
 785                 .nfs_mod = &nfs_v4,
 786                 .proto = proto,
 787                 .minorversion = minorversion,
 788                 .net = net,
 789         };
 790         struct nfs_client *clp;
 791         int error;
 792
 793         dprintk("--> nfs4_set_client()\n");
 794
 795         if (server->flags & NFS_MOUNT_NORESVPORT)
 796                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
 797         if (server->options & NFS_OPTION_MIGRATION)
 798                 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
 799
 800         /* Allocate or find a client reference we can use */
 801         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
 802         if (IS_ERR(clp)) {
 803                 error = PTR_ERR(clp);
 804                 goto error;
 805         }
 806
 807         /*
 808          * Query for the lease time on clientid setup or renewal
 809          *
 810          * Note that this will be set on nfs_clients that were created
 811          * only for the DS role and did not set this bit, but now will
 812          * serve a dual role.
 813          */
 814         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
 815
 816         server->nfs_client = clp;
 817         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
 818         return 0;
 819 error:
 820         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
 821         return error;
 822 }
 823
 824 /*
 825  * Set up a pNFS Data Server client.
 826  *
 827  * Return any existing nfs_client that matches server address,port,version
 828  * and minorversion.
 829  *
 830  * For a new nfs_client, use a soft mount (default), a low retrans and a
 831  * low timeout interval so that if a connection is lost, we retry through
 832  * the MDS.
 833  */
 834 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 835                 const struct sockaddr *ds_addr, int ds_addrlen,
 836                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
 837 {
 838         struct nfs_client_initdata cl_init = {
 839                 .addr = ds_addr,
 840                 .addrlen = ds_addrlen,
 841                 .nfs_mod = &nfs_v4,
 842                 .proto = ds_proto,
 843                 .minorversion = mds_clp->cl_minorversion,
 844                 .net = mds_clp->cl_net,
 845         };
 846         struct rpc_timeout ds_timeout;
 847         struct nfs_client *clp;
 848
 849         /*
 850          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
 851          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
 852          * (section 13.1 RFC 5661).
 853          */
 854         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
 855         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
 856                              mds_clp->cl_rpcclient->cl_auth->au_flavor);
 857
 858         dprintk("<-- %s %p\n", __func__, clp);
 859         return clp;
 860 }
 861 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
 862
 863 /*
 864  * Session has been established, and the client marked ready.
 865  * Set the mount rsize and wsize with negotiated fore channel
 866  * attributes which will be bound checked in nfs_server_set_fsinfo.
 867  */
 868 static void nfs4_session_set_rwsize(struct nfs_server *server)
 869 {
 870 #ifdef CONFIG_NFS_V4_1
 871         struct nfs4_session *sess;
 872         u32 server_resp_sz;
 873         u32 server_rqst_sz;
 874
 875         if (!nfs4_has_session(server->nfs_client))
 876                 return;
 877         sess = server->nfs_client->cl_session;
 878         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
 879         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
 880
 881         if (server->rsize > server_resp_sz)
 882                 server->rsize = server_resp_sz;
 883         if (server->wsize > server_rqst_sz)
 884                 server->wsize = server_rqst_sz;
 885 #endif /* CONFIG_NFS_V4_1 */
 886 }
 887
 888 static int nfs4_server_common_setup(struct nfs_server *server,
 889                 struct nfs_fh *mntfh, bool auth_probe)
 890 {
 891         struct nfs_fattr *fattr;
 892         int error;
 893
 894         /* data servers support only a subset of NFSv4.1 */
 895         if (is_ds_only_client(server->nfs_client))
 896                 return -EPROTONOSUPPORT;
 897
 898         fattr = nfs_alloc_fattr();
 899         if (fattr == NULL)
 900                 return -ENOMEM;
 901
 902         /* We must ensure the session is initialised first */
 903         error = nfs4_init_session(server->nfs_client);
 904         if (error < 0)
 905                 goto out;
 906
 907         /* Set the basic capabilities */
 908         server->caps |= server->nfs_client->cl_mvops->init_caps;
 909         if (server->flags & NFS_MOUNT_NORDIRPLUS)
 910                         server->caps &= ~NFS_CAP_READDIRPLUS;
 911         /*
 912          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
 913          * authentication.
 914          */
 915         if (nfs4_disable_idmapping &&
 916                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
 917                 server->caps |= NFS_CAP_UIDGID_NOMAP;
 918
 919
 920         /* Probe the root fh to retrieve its FSID and filehandle */
 921         error = nfs4_get_rootfh(server, mntfh, auth_probe);
 922         if (error < 0)
 923                 goto out;
 924
 925         dprintk("Server FSID: %llx:%llx\n",
 926                         (unsigned long long) server->fsid.major,
 927                         (unsigned long long) server->fsid.minor);
 928         dprintk("Mount FH: %d\n", mntfh->size);
 929
 930         nfs4_session_set_rwsize(server);
 931
 932         error = nfs_probe_fsinfo(server, mntfh, fattr);
 933         if (error < 0)
 934                 goto out;
 935
 936         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
 937                 server->namelen = NFS4_MAXNAMLEN;
 938
 939         nfs_server_insert_lists(server);
 940         server->mount_time = jiffies;
 941         server->destroy = nfs4_destroy_server;
 942 out:
 943         nfs_free_fattr(fattr);
 944         return error;
 945 }
 946
 947 /*
 948  * Create a version 4 volume record
 949  */
 950 static int nfs4_init_server(struct nfs_server *server,
 951                 const struct nfs_parsed_mount_data *data)
 952 {
 953         rpc_authflavor_t pseudoflavor = RPC_AUTH_UNIX;
 954         struct rpc_timeout timeparms;
 955         int error;
 956
 957         dprintk("--> nfs4_init_server()\n");
 958
 959         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
 960                         data->timeo, data->retrans);
 961
 962         /* Initialise the client representation from the mount data */
 963         server->flags = data->flags;
 964         server->options = data->options;
 965
 966         if (data->auth_flavor_len >= 1)
 967                 pseudoflavor = data->auth_flavors[0];
 968
 969         /* Get a client record */
 970         error = nfs4_set_client(server,
 971                         data->nfs_server.hostname,
 972                         (const struct sockaddr *)&data->nfs_server.address,
 973                         data->nfs_server.addrlen,
 974                         data->client_address,
 975                         pseudoflavor,
 976                         data->nfs_server.protocol,
 977                         &timeparms,
 978                         data->minorversion,
 979                         data->net);
 980         if (error < 0)
 981                 goto error;
 982
 983         if (data->rsize)
 984                 server->rsize = nfs_block_size(data->rsize, NULL);
 985         if (data->wsize)
 986                 server->wsize = nfs_block_size(data->wsize, NULL);
 987
 988         server->acregmin = data->acregmin * HZ;
 989         server->acregmax = data->acregmax * HZ;
 990         server->acdirmin = data->acdirmin * HZ;
 991         server->acdirmax = data->acdirmax * HZ;
 992
 993         server->port = data->nfs_server.port;
 994
 995         error = nfs_init_server_rpcclient(server, &timeparms, pseudoflavor);
 996
 997 error:
 998         /* Done */
 999         dprintk("<-- nfs4_init_server() = %d\n", error);
1000         return error;
1001 }
1002
1003 /*
1004  * Create a version 4 volume record
1005  * - keyed on server and FSID
1006  */
1007 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1008                                       struct nfs_fh *mntfh)*/
1009 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1010                                       struct nfs_subversion *nfs_mod)
1011 {
1012         struct nfs_server *server;
1013         bool auth_probe;
1014         int error;
1015
1016         dprintk("--> nfs4_create_server()\n");
1017
1018         server = nfs_alloc_server();
1019         if (!server)
1020                 return ERR_PTR(-ENOMEM);
1021
1022         auth_probe = mount_info->parsed->auth_flavor_len < 1;
1023
1024         /* set up the general RPC client */
1025         error = nfs4_init_server(server, mount_info->parsed);
1026         if (error < 0)
1027                 goto error;
1028
1029         error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1030         if (error < 0)
1031                 goto error;
1032
1033         dprintk("<-- nfs4_create_server() = %p\n", server);
1034         return server;
1035
1036 error:
1037         nfs_free_server(server);
1038         dprintk("<-- nfs4_create_server() = error %d\n", error);
1039         return ERR_PTR(error);
1040 }
1041
1042 /*
1043  * Create an NFS4 referral server record
1044  */
1045 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1046                                                struct nfs_fh *mntfh)
1047 {
1048         struct nfs_client *parent_client;
1049         struct nfs_server *server, *parent_server;
1050         int error;
1051
1052         dprintk("--> nfs4_create_referral_server()\n");
1053
1054         server = nfs_alloc_server();
1055         if (!server)
1056                 return ERR_PTR(-ENOMEM);
1057
1058         parent_server = NFS_SB(data->sb);
1059         parent_client = parent_server->nfs_client;
1060
1061         /* Initialise the client representation from the parent server */
1062         nfs_server_copy_userdata(server, parent_server);
1063
1064         /* Get a client representation.
1065          * Note: NFSv4 always uses TCP, */
1066         error = nfs4_set_client(server, data->hostname,
1067                                 data->addr,
1068                                 data->addrlen,
1069                                 parent_client->cl_ipaddr,
1070                                 data->authflavor,
1071                                 rpc_protocol(parent_server->client),
1072                                 parent_server->client->cl_timeout,
1073                                 parent_client->cl_mvops->minor_version,
1074                                 parent_client->cl_net);
1075         if (error < 0)
1076                 goto error;
1077
1078         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1079         if (error < 0)
1080                 goto error;
1081
1082         error = nfs4_server_common_setup(server, mntfh,
1083                         !(parent_server->flags & NFS_MOUNT_SECFLAVOUR));
1084         if (error < 0)
1085                 goto error;
1086
1087         dprintk("<-- nfs_create_referral_server() = %p\n", server);
1088         return server;
1089
1090 error:
1091         nfs_free_server(server);
1092         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1093         return ERR_PTR(error);
1094 }