fs/nfs/nfs4state.c

   1 /*
   2  *  fs/nfs/nfs4state.c
   3  *
   4  *  Client-side XDR for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *
  11  *  Redistribution and use in source and binary forms, with or without
  12  *  modification, are permitted provided that the following conditions
  13  *  are met:
  14  *
  15  *  1. Redistributions of source code must retain the above copyright
  16  *     notice, this list of conditions and the following disclaimer.
  17  *  2. Redistributions in binary form must reproduce the above copyright
  18  *     notice, this list of conditions and the following disclaimer in the
  19  *     documentation and/or other materials provided with the distribution.
  20  *  3. Neither the name of the University nor the names of its
  21  *     contributors may be used to endorse or promote products derived
  22  *     from this software without specific prior written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  25  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  31  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  * Implementation of the NFSv4 state model.  For the time being,
  37  * this is minimal, but will be made much more complex in a
  38  * subsequent patch.
  39  */
  40
  41 #include <linux/kernel.h>
  42 #include <linux/slab.h>
  43 #include <linux/fs.h>
  44 #include <linux/nfs_fs.h>
  45 #include <linux/nfs_idmap.h>
  46 #include <linux/kthread.h>
  47 #include <linux/module.h>
  48 #include <linux/random.h>
  49 #include <linux/ratelimit.h>
  50 #include <linux/workqueue.h>
  51 #include <linux/bitops.h>
  52 #include <linux/jiffies.h>
  53
  54 #include <linux/sunrpc/clnt.h>
  55
  56 #include "nfs4_fs.h"
  57 #include "callback.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "pnfs.h"
  61 #include "netns.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_STATE
  64
  65 #define OPENOWNER_POOL_SIZE     8
  66
  67 const nfs4_stateid zero_stateid;
  68 static DEFINE_MUTEX(nfs_clid_init_mutex);
  69 static LIST_HEAD(nfs4_clientid_list);
  70
  71 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
  72 {
  73         struct nfs4_setclientid_res clid = {
  74                 .clientid = clp->cl_clientid,
  75                 .confirm = clp->cl_confirm,
  76         };
  77         unsigned short port;
  78         int status;
  79         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
  80
  81         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
  82                 goto do_confirm;
  83         port = nn->nfs_callback_tcpport;
  84         if (clp->cl_addr.ss_family == AF_INET6)
  85                 port = nn->nfs_callback_tcpport6;
  86
  87         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
  88         if (status != 0)
  89                 goto out;
  90         clp->cl_clientid = clid.clientid;
  91         clp->cl_confirm = clid.confirm;
  92         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  93 do_confirm:
  94         status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
  95         if (status != 0)
  96                 goto out;
  97         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  98         nfs4_schedule_state_renewal(clp);
  99 out:
 100         return status;
 101 }
 102
 103 /**
 104  * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
 105  *
 106  * @clp: nfs_client under test
 107  * @result: OUT: found nfs_client, or clp
 108  * @cred: credential to use for trunking test
 109  *
 110  * Returns zero, a negative errno, or a negative NFS4ERR status.
 111  * If zero is returned, an nfs_client pointer is planted in
 112  * "result".
 113  *
 114  * Note: The returned client may not yet be marked ready.
 115  */
 116 int nfs40_discover_server_trunking(struct nfs_client *clp,
 117                                    struct nfs_client **result,
 118                                    struct rpc_cred *cred)
 119 {
 120         struct nfs4_setclientid_res clid = {
 121                 .clientid = clp->cl_clientid,
 122                 .confirm = clp->cl_confirm,
 123         };
 124         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
 125         unsigned short port;
 126         int status;
 127
 128         port = nn->nfs_callback_tcpport;
 129         if (clp->cl_addr.ss_family == AF_INET6)
 130                 port = nn->nfs_callback_tcpport6;
 131
 132         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
 133         if (status != 0)
 134                 goto out;
 135         clp->cl_clientid = clid.clientid;
 136         clp->cl_confirm = clid.confirm;
 137
 138         status = nfs40_walk_client_list(clp, result, cred);
 139         switch (status) {
 140         case -NFS4ERR_STALE_CLIENTID:
 141                 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 142         case 0:
 143                 /* Sustain the lease, even if it's empty.  If the clientid4
 144                  * goes stale it's of no use for trunking discovery. */
 145                 nfs4_schedule_state_renewal(*result);
 146                 break;
 147         }
 148
 149 out:
 150         return status;
 151 }
 152
 153 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
 154 {
 155         struct rpc_cred *cred = NULL;
 156
 157         if (clp->cl_machine_cred != NULL)
 158                 cred = get_rpccred(clp->cl_machine_cred);
 159         return cred;
 160 }
 161
 162 static void nfs4_clear_machine_cred(struct nfs_client *clp)
 163 {
 164         struct rpc_cred *cred;
 165
 166         spin_lock(&clp->cl_lock);
 167         cred = clp->cl_machine_cred;
 168         clp->cl_machine_cred = NULL;
 169         spin_unlock(&clp->cl_lock);
 170         if (cred != NULL)
 171                 put_rpccred(cred);
 172 }
 173
 174 static struct rpc_cred *
 175 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
 176 {
 177         struct rpc_cred *cred = NULL;
 178         struct nfs4_state_owner *sp;
 179         struct rb_node *pos;
 180
 181         for (pos = rb_first(&server->state_owners);
 182              pos != NULL;
 183              pos = rb_next(pos)) {
 184                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 185                 if (list_empty(&sp->so_states))
 186                         continue;
 187                 cred = get_rpccred(sp->so_cred);
 188                 break;
 189         }
 190         return cred;
 191 }
 192
 193 /**
 194  * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
 195  * @clp: client state handle
 196  *
 197  * Returns an rpc_cred with reference count bumped, or NULL.
 198  * Caller must hold clp->cl_lock.
 199  */
 200 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 201 {
 202         struct rpc_cred *cred = NULL;
 203         struct nfs_server *server;
 204
 205         /* Use machine credentials if available */
 206         cred = nfs4_get_machine_cred_locked(clp);
 207         if (cred != NULL)
 208                 goto out;
 209
 210         rcu_read_lock();
 211         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 212                 cred = nfs4_get_renew_cred_server_locked(server);
 213                 if (cred != NULL)
 214                         break;
 215         }
 216         rcu_read_unlock();
 217
 218 out:
 219         return cred;
 220 }
 221
 222 #if defined(CONFIG_NFS_V4_1)
 223
 224 static int nfs41_setup_state_renewal(struct nfs_client *clp)
 225 {
 226         int status;
 227         struct nfs_fsinfo fsinfo;
 228
 229         if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
 230                 nfs4_schedule_state_renewal(clp);
 231                 return 0;
 232         }
 233
 234         status = nfs4_proc_get_lease_time(clp, &fsinfo);
 235         if (status == 0) {
 236                 /* Update lease time and schedule renewal */
 237                 spin_lock(&clp->cl_lock);
 238                 clp->cl_lease_time = fsinfo.lease_time * HZ;
 239                 clp->cl_last_renewal = jiffies;
 240                 spin_unlock(&clp->cl_lock);
 241
 242                 nfs4_schedule_state_renewal(clp);
 243         }
 244
 245         return status;
 246 }
 247
 248 /*
 249  * Back channel returns NFS4ERR_DELAY for new requests when
 250  * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 251  * is ended.
 252  */
 253 static void nfs4_end_drain_session(struct nfs_client *clp)
 254 {
 255         struct nfs4_session *ses = clp->cl_session;
 256         struct nfs4_slot_table *tbl;
 257         unsigned int i;
 258
 259         if (ses == NULL)
 260                 return;
 261         tbl = &ses->fc_slot_table;
 262         if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 263                 spin_lock(&tbl->slot_tbl_lock);
 264                 for (i = 0; i <= tbl->max_slotid; i++) {
 265                         if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
 266                                                 nfs4_set_task_privileged,
 267                                                 NULL) == NULL)
 268                                 break;
 269                 }
 270                 spin_unlock(&tbl->slot_tbl_lock);
 271         }
 272 }
 273
 274 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
 275 {
 276         spin_lock(&tbl->slot_tbl_lock);
 277         if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
 278                 INIT_COMPLETION(tbl->complete);
 279                 spin_unlock(&tbl->slot_tbl_lock);
 280                 return wait_for_completion_interruptible(&tbl->complete);
 281         }
 282         spin_unlock(&tbl->slot_tbl_lock);
 283         return 0;
 284 }
 285
 286 static int nfs4_begin_drain_session(struct nfs_client *clp)
 287 {
 288         struct nfs4_session *ses = clp->cl_session;
 289         int ret = 0;
 290
 291         set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
 292         /* back channel */
 293         ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
 294         if (ret)
 295                 return ret;
 296         /* fore channel */
 297         return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
 298 }
 299
 300 static void nfs41_finish_session_reset(struct nfs_client *clp)
 301 {
 302         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 303         clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
 304         /* create_session negotiated new slot table */
 305         clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
 306         clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
 307         nfs41_setup_state_renewal(clp);
 308 }
 309
 310 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 311 {
 312         int status;
 313
 314         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
 315                 goto do_confirm;
 316         nfs4_begin_drain_session(clp);
 317         status = nfs4_proc_exchange_id(clp, cred);
 318         if (status != 0)
 319                 goto out;
 320         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 321 do_confirm:
 322         status = nfs4_proc_create_session(clp, cred);
 323         if (status != 0)
 324                 goto out;
 325         nfs41_finish_session_reset(clp);
 326         nfs_mark_client_ready(clp, NFS_CS_READY);
 327 out:
 328         return status;
 329 }
 330
 331 /**
 332  * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
 333  *
 334  * @clp: nfs_client under test
 335  * @result: OUT: found nfs_client, or clp
 336  * @cred: credential to use for trunking test
 337  *
 338  * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
 339  * If NFS4_OK is returned, an nfs_client pointer is planted in
 340  * "result".
 341  *
 342  * Note: The returned client may not yet be marked ready.
 343  */
 344 int nfs41_discover_server_trunking(struct nfs_client *clp,
 345                                    struct nfs_client **result,
 346                                    struct rpc_cred *cred)
 347 {
 348         int status;
 349
 350         status = nfs4_proc_exchange_id(clp, cred);
 351         if (status != NFS4_OK)
 352                 return status;
 353         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 354
 355         return nfs41_walk_client_list(clp, result, cred);
 356 }
 357
 358 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 359 {
 360         struct rpc_cred *cred;
 361
 362         spin_lock(&clp->cl_lock);
 363         cred = nfs4_get_machine_cred_locked(clp);
 364         spin_unlock(&clp->cl_lock);
 365         return cred;
 366 }
 367
 368 #endif /* CONFIG_NFS_V4_1 */
 369
 370 static struct rpc_cred *
 371 nfs4_get_setclientid_cred_server(struct nfs_server *server)
 372 {
 373         struct nfs_client *clp = server->nfs_client;
 374         struct rpc_cred *cred = NULL;
 375         struct nfs4_state_owner *sp;
 376         struct rb_node *pos;
 377
 378         spin_lock(&clp->cl_lock);
 379         pos = rb_first(&server->state_owners);
 380         if (pos != NULL) {
 381                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 382                 cred = get_rpccred(sp->so_cred);
 383         }
 384         spin_unlock(&clp->cl_lock);
 385         return cred;
 386 }
 387
 388 /**
 389  * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 390  * @clp: client state handle
 391  *
 392  * Returns an rpc_cred with reference count bumped, or NULL.
 393  */
 394 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 395 {
 396         struct nfs_server *server;
 397         struct rpc_cred *cred;
 398
 399         spin_lock(&clp->cl_lock);
 400         cred = nfs4_get_machine_cred_locked(clp);
 401         spin_unlock(&clp->cl_lock);
 402         if (cred != NULL)
 403                 goto out;
 404
 405         rcu_read_lock();
 406         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 407                 cred = nfs4_get_setclientid_cred_server(server);
 408                 if (cred != NULL)
 409                         break;
 410         }
 411         rcu_read_unlock();
 412
 413 out:
 414         return cred;
 415 }
 416
 417 static struct nfs4_state_owner *
 418 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
 419 {
 420         struct rb_node **p = &server->state_owners.rb_node,
 421                        *parent = NULL;
 422         struct nfs4_state_owner *sp;
 423
 424         while (*p != NULL) {
 425                 parent = *p;
 426                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 427
 428                 if (cred < sp->so_cred)
 429                         p = &parent->rb_left;
 430                 else if (cred > sp->so_cred)
 431                         p = &parent->rb_right;
 432                 else {
 433                         if (!list_empty(&sp->so_lru))
 434                                 list_del_init(&sp->so_lru);
 435                         atomic_inc(&sp->so_count);
 436                         return sp;
 437                 }
 438         }
 439         return NULL;
 440 }
 441
 442 static struct nfs4_state_owner *
 443 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
 444 {
 445         struct nfs_server *server = new->so_server;
 446         struct rb_node **p = &server->state_owners.rb_node,
 447                        *parent = NULL;
 448         struct nfs4_state_owner *sp;
 449         int err;
 450
 451         while (*p != NULL) {
 452                 parent = *p;
 453                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 454
 455                 if (new->so_cred < sp->so_cred)
 456                         p = &parent->rb_left;
 457                 else if (new->so_cred > sp->so_cred)
 458                         p = &parent->rb_right;
 459                 else {
 460                         if (!list_empty(&sp->so_lru))
 461                                 list_del_init(&sp->so_lru);
 462                         atomic_inc(&sp->so_count);
 463                         return sp;
 464                 }
 465         }
 466         err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
 467         if (err)
 468                 return ERR_PTR(err);
 469         rb_link_node(&new->so_server_node, parent, p);
 470         rb_insert_color(&new->so_server_node, &server->state_owners);
 471         return new;
 472 }
 473
 474 static void
 475 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
 476 {
 477         struct nfs_server *server = sp->so_server;
 478
 479         if (!RB_EMPTY_NODE(&sp->so_server_node))
 480                 rb_erase(&sp->so_server_node, &server->state_owners);
 481         ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
 482 }
 483
 484 static void
 485 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
 486 {
 487         sc->create_time = ktime_get();
 488         sc->flags = 0;
 489         sc->counter = 0;
 490         spin_lock_init(&sc->lock);
 491         INIT_LIST_HEAD(&sc->list);
 492         rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
 493 }
 494
 495 static void
 496 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
 497 {
 498         rpc_destroy_wait_queue(&sc->wait);
 499 }
 500
 501 /*
 502  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 503  * create a new state_owner.
 504  *
 505  */
 506 static struct nfs4_state_owner *
 507 nfs4_alloc_state_owner(struct nfs_server *server,
 508                 struct rpc_cred *cred,
 509                 gfp_t gfp_flags)
 510 {
 511         struct nfs4_state_owner *sp;
 512
 513         sp = kzalloc(sizeof(*sp), gfp_flags);
 514         if (!sp)
 515                 return NULL;
 516         sp->so_server = server;
 517         sp->so_cred = get_rpccred(cred);
 518         spin_lock_init(&sp->so_lock);
 519         INIT_LIST_HEAD(&sp->so_states);
 520         nfs4_init_seqid_counter(&sp->so_seqid);
 521         atomic_set(&sp->so_count, 1);
 522         INIT_LIST_HEAD(&sp->so_lru);
 523         return sp;
 524 }
 525
 526 static void
 527 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 528 {
 529         struct rb_node *rb_node = &sp->so_server_node;
 530
 531         if (!RB_EMPTY_NODE(rb_node)) {
 532                 struct nfs_server *server = sp->so_server;
 533                 struct nfs_client *clp = server->nfs_client;
 534
 535                 spin_lock(&clp->cl_lock);
 536                 if (!RB_EMPTY_NODE(rb_node)) {
 537                         rb_erase(rb_node, &server->state_owners);
 538                         RB_CLEAR_NODE(rb_node);
 539                 }
 540                 spin_unlock(&clp->cl_lock);
 541         }
 542 }
 543
 544 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
 545 {
 546         nfs4_destroy_seqid_counter(&sp->so_seqid);
 547         put_rpccred(sp->so_cred);
 548         kfree(sp);
 549 }
 550
 551 static void nfs4_gc_state_owners(struct nfs_server *server)
 552 {
 553         struct nfs_client *clp = server->nfs_client;
 554         struct nfs4_state_owner *sp, *tmp;
 555         unsigned long time_min, time_max;
 556         LIST_HEAD(doomed);
 557
 558         spin_lock(&clp->cl_lock);
 559         time_max = jiffies;
 560         time_min = (long)time_max - (long)clp->cl_lease_time;
 561         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 562                 /* NB: LRU is sorted so that oldest is at the head */
 563                 if (time_in_range(sp->so_expires, time_min, time_max))
 564                         break;
 565                 list_move(&sp->so_lru, &doomed);
 566                 nfs4_remove_state_owner_locked(sp);
 567         }
 568         spin_unlock(&clp->cl_lock);
 569
 570         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 571                 list_del(&sp->so_lru);
 572                 nfs4_free_state_owner(sp);
 573         }
 574 }
 575
 576 /**
 577  * nfs4_get_state_owner - Look up a state owner given a credential
 578  * @server: nfs_server to search
 579  * @cred: RPC credential to match
 580  *
 581  * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
 582  */
 583 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
 584                                               struct rpc_cred *cred,
 585                                               gfp_t gfp_flags)
 586 {
 587         struct nfs_client *clp = server->nfs_client;
 588         struct nfs4_state_owner *sp, *new;
 589
 590         spin_lock(&clp->cl_lock);
 591         sp = nfs4_find_state_owner_locked(server, cred);
 592         spin_unlock(&clp->cl_lock);
 593         if (sp != NULL)
 594                 goto out;
 595         new = nfs4_alloc_state_owner(server, cred, gfp_flags);
 596         if (new == NULL)
 597                 goto out;
 598         do {
 599                 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
 600                         break;
 601                 spin_lock(&clp->cl_lock);
 602                 sp = nfs4_insert_state_owner_locked(new);
 603                 spin_unlock(&clp->cl_lock);
 604         } while (sp == ERR_PTR(-EAGAIN));
 605         if (sp != new)
 606                 nfs4_free_state_owner(new);
 607 out:
 608         nfs4_gc_state_owners(server);
 609         return sp;
 610 }
 611
 612 /**
 613  * nfs4_put_state_owner - Release a nfs4_state_owner
 614  * @sp: state owner data to release
 615  *
 616  * Note that we keep released state owners on an LRU
 617  * list.
 618  * This caches valid state owners so that they can be
 619  * reused, to avoid the OPEN_CONFIRM on minor version 0.
 620  * It also pins the uniquifier of dropped state owners for
 621  * a while, to ensure that those state owner names are
 622  * never reused.
 623  */
 624 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 625 {
 626         struct nfs_server *server = sp->so_server;
 627         struct nfs_client *clp = server->nfs_client;
 628
 629         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 630                 return;
 631
 632         sp->so_expires = jiffies;
 633         list_add_tail(&sp->so_lru, &server->state_owners_lru);
 634         spin_unlock(&clp->cl_lock);
 635 }
 636
 637 /**
 638  * nfs4_purge_state_owners - Release all cached state owners
 639  * @server: nfs_server with cached state owners to release
 640  *
 641  * Called at umount time.  Remaining state owners will be on
 642  * the LRU with ref count of zero.
 643  */
 644 void nfs4_purge_state_owners(struct nfs_server *server)
 645 {
 646         struct nfs_client *clp = server->nfs_client;
 647         struct nfs4_state_owner *sp, *tmp;
 648         LIST_HEAD(doomed);
 649
 650         spin_lock(&clp->cl_lock);
 651         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 652                 list_move(&sp->so_lru, &doomed);
 653                 nfs4_remove_state_owner_locked(sp);
 654         }
 655         spin_unlock(&clp->cl_lock);
 656
 657         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 658                 list_del(&sp->so_lru);
 659                 nfs4_free_state_owner(sp);
 660         }
 661 }
 662
 663 static struct nfs4_state *
 664 nfs4_alloc_open_state(void)
 665 {
 666         struct nfs4_state *state;
 667
 668         state = kzalloc(sizeof(*state), GFP_NOFS);
 669         if (!state)
 670                 return NULL;
 671         atomic_set(&state->count, 1);
 672         INIT_LIST_HEAD(&state->lock_states);
 673         spin_lock_init(&state->state_lock);
 674         seqlock_init(&state->seqlock);
 675         return state;
 676 }
 677
 678 void
 679 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 680 {
 681         if (state->state == fmode)
 682                 return;
 683         /* NB! List reordering - see the reclaim code for why.  */
 684         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 685                 if (fmode & FMODE_WRITE)
 686                         list_move(&state->open_states, &state->owner->so_states);
 687                 else
 688                         list_move_tail(&state->open_states, &state->owner->so_states);
 689         }
 690         state->state = fmode;
 691 }
 692
 693 static struct nfs4_state *
 694 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 695 {
 696         struct nfs_inode *nfsi = NFS_I(inode);
 697         struct nfs4_state *state;
 698
 699         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 700                 if (state->owner != owner)
 701                         continue;
 702                 if (atomic_inc_not_zero(&state->count))
 703                         return state;
 704         }
 705         return NULL;
 706 }
 707
 708 static void
 709 nfs4_free_open_state(struct nfs4_state *state)
 710 {
 711         kfree(state);
 712 }
 713
 714 struct nfs4_state *
 715 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 716 {
 717         struct nfs4_state *state, *new;
 718         struct nfs_inode *nfsi = NFS_I(inode);
 719
 720         spin_lock(&inode->i_lock);
 721         state = __nfs4_find_state_byowner(inode, owner);
 722         spin_unlock(&inode->i_lock);
 723         if (state)
 724                 goto out;
 725         new = nfs4_alloc_open_state();
 726         spin_lock(&owner->so_lock);
 727         spin_lock(&inode->i_lock);
 728         state = __nfs4_find_state_byowner(inode, owner);
 729         if (state == NULL && new != NULL) {
 730                 state = new;
 731                 state->owner = owner;
 732                 atomic_inc(&owner->so_count);
 733                 list_add(&state->inode_states, &nfsi->open_states);
 734                 ihold(inode);
 735                 state->inode = inode;
 736                 spin_unlock(&inode->i_lock);
 737                 /* Note: The reclaim code dictates that we add stateless
 738                  * and read-only stateids to the end of the list */
 739                 list_add_tail(&state->open_states, &owner->so_states);
 740                 spin_unlock(&owner->so_lock);
 741         } else {
 742                 spin_unlock(&inode->i_lock);
 743                 spin_unlock(&owner->so_lock);
 744                 if (new)
 745                         nfs4_free_open_state(new);
 746         }
 747 out:
 748         return state;
 749 }
 750
 751 void nfs4_put_open_state(struct nfs4_state *state)
 752 {
 753         struct inode *inode = state->inode;
 754         struct nfs4_state_owner *owner = state->owner;
 755
 756         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 757                 return;
 758         spin_lock(&inode->i_lock);
 759         list_del(&state->inode_states);
 760         list_del(&state->open_states);
 761         spin_unlock(&inode->i_lock);
 762         spin_unlock(&owner->so_lock);
 763         iput(inode);
 764         nfs4_free_open_state(state);
 765         nfs4_put_state_owner(owner);
 766 }
 767
 768 /*
 769  * Close the current file.
 770  */
 771 static void __nfs4_close(struct nfs4_state *state,
 772                 fmode_t fmode, gfp_t gfp_mask, int wait)
 773 {
 774         struct nfs4_state_owner *owner = state->owner;
 775         int call_close = 0;
 776         fmode_t newstate;
 777
 778         atomic_inc(&owner->so_count);
 779         /* Protect against nfs4_find_state() */
 780         spin_lock(&owner->so_lock);
 781         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 782                 case FMODE_READ:
 783                         state->n_rdonly--;
 784                         break;
 785                 case FMODE_WRITE:
 786                         state->n_wronly--;
 787                         break;
 788                 case FMODE_READ|FMODE_WRITE:
 789                         state->n_rdwr--;
 790         }
 791         newstate = FMODE_READ|FMODE_WRITE;
 792         if (state->n_rdwr == 0) {
 793                 if (state->n_rdonly == 0) {
 794                         newstate &= ~FMODE_READ;
 795                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 796                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 797                 }
 798                 if (state->n_wronly == 0) {
 799                         newstate &= ~FMODE_WRITE;
 800                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 801                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 802                 }
 803                 if (newstate == 0)
 804                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 805         }
 806         nfs4_state_set_mode_locked(state, newstate);
 807         spin_unlock(&owner->so_lock);
 808
 809         if (!call_close) {
 810                 nfs4_put_open_state(state);
 811                 nfs4_put_state_owner(owner);
 812         } else
 813                 nfs4_do_close(state, gfp_mask, wait);
 814 }
 815
 816 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
 817 {
 818         __nfs4_close(state, fmode, GFP_NOFS, 0);
 819 }
 820
 821 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
 822 {
 823         __nfs4_close(state, fmode, GFP_KERNEL, 1);
 824 }
 825
 826 /*
 827  * Search the state->lock_states for an existing lock_owner
 828  * that is compatible with current->files
 829  */
 830 static struct nfs4_lock_state *
 831 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 832 {
 833         struct nfs4_lock_state *pos;
 834         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 835                 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
 836                         continue;
 837                 switch (pos->ls_owner.lo_type) {
 838                 case NFS4_POSIX_LOCK_TYPE:
 839                         if (pos->ls_owner.lo_u.posix_owner != fl_owner)
 840                                 continue;
 841                         break;
 842                 case NFS4_FLOCK_LOCK_TYPE:
 843                         if (pos->ls_owner.lo_u.flock_owner != fl_pid)
 844                                 continue;
 845                 }
 846                 atomic_inc(&pos->ls_count);
 847                 return pos;
 848         }
 849         return NULL;
 850 }
 851
 852 /*
 853  * Return a compatible lock_state. If no initialized lock_state structure
 854  * exists, return an uninitialized one.
 855  *
 856  */
 857 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 858 {
 859         struct nfs4_lock_state *lsp;
 860         struct nfs_server *server = state->owner->so_server;
 861
 862         lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
 863         if (lsp == NULL)
 864                 return NULL;
 865         nfs4_init_seqid_counter(&lsp->ls_seqid);
 866         atomic_set(&lsp->ls_count, 1);
 867         lsp->ls_state = state;
 868         lsp->ls_owner.lo_type = type;
 869         switch (lsp->ls_owner.lo_type) {
 870         case NFS4_FLOCK_LOCK_TYPE:
 871                 lsp->ls_owner.lo_u.flock_owner = fl_pid;
 872                 break;
 873         case NFS4_POSIX_LOCK_TYPE:
 874                 lsp->ls_owner.lo_u.posix_owner = fl_owner;
 875                 break;
 876         default:
 877                 goto out_free;
 878         }
 879         lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
 880         if (lsp->ls_seqid.owner_id < 0)
 881                 goto out_free;
 882         INIT_LIST_HEAD(&lsp->ls_locks);
 883         return lsp;
 884 out_free:
 885         kfree(lsp);
 886         return NULL;
 887 }
 888
 889 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
 890 {
 891         ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
 892         nfs4_destroy_seqid_counter(&lsp->ls_seqid);
 893         kfree(lsp);
 894 }
 895
 896 /*
 897  * Return a compatible lock_state. If no initialized lock_state structure
 898  * exists, return an uninitialized one.
 899  *
 900  */
 901 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
 902 {
 903         struct nfs4_lock_state *lsp, *new = NULL;
 904
 905         for(;;) {
 906                 spin_lock(&state->state_lock);
 907                 lsp = __nfs4_find_lock_state(state, owner, pid, type);
 908                 if (lsp != NULL)
 909                         break;
 910                 if (new != NULL) {
 911                         list_add(&new->ls_locks, &state->lock_states);
 912                         set_bit(LK_STATE_IN_USE, &state->flags);
 913                         lsp = new;
 914                         new = NULL;
 915                         break;
 916                 }
 917                 spin_unlock(&state->state_lock);
 918                 new = nfs4_alloc_lock_state(state, owner, pid, type);
 919                 if (new == NULL)
 920                         return NULL;
 921         }
 922         spin_unlock(&state->state_lock);
 923         if (new != NULL)
 924                 nfs4_free_lock_state(state->owner->so_server, new);
 925         return lsp;
 926 }
 927
 928 /*
 929  * Release reference to lock_state, and free it if we see that
 930  * it is no longer in use
 931  */
 932 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 933 {
 934         struct nfs4_state *state;
 935
 936         if (lsp == NULL)
 937                 return;
 938         state = lsp->ls_state;
 939         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 940                 return;
 941         list_del(&lsp->ls_locks);
 942         if (list_empty(&state->lock_states))
 943                 clear_bit(LK_STATE_IN_USE, &state->flags);
 944         spin_unlock(&state->state_lock);
 945         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
 946                 if (nfs4_release_lockowner(lsp) == 0)
 947                         return;
 948         }
 949         nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
 950 }
 951
 952 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 953 {
 954         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 955
 956         dst->fl_u.nfs4_fl.owner = lsp;
 957         atomic_inc(&lsp->ls_count);
 958 }
 959
 960 static void nfs4_fl_release_lock(struct file_lock *fl)
 961 {
 962         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 963 }
 964
 965 static const struct file_lock_operations nfs4_fl_lock_ops = {
 966         .fl_copy_lock = nfs4_fl_copy_lock,
 967         .fl_release_private = nfs4_fl_release_lock,
 968 };
 969
 970 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 971 {
 972         struct nfs4_lock_state *lsp;
 973
 974         if (fl->fl_ops != NULL)
 975                 return 0;
 976         if (fl->fl_flags & FL_POSIX)
 977                 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
 978         else if (fl->fl_flags & FL_FLOCK)
 979                 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
 980                                 NFS4_FLOCK_LOCK_TYPE);
 981         else
 982                 return -EINVAL;
 983         if (lsp == NULL)
 984                 return -ENOMEM;
 985         fl->fl_u.nfs4_fl.owner = lsp;
 986         fl->fl_ops = &nfs4_fl_lock_ops;
 987         return 0;
 988 }
 989
 990 static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
 991                 const struct nfs_lockowner *lockowner)
 992 {
 993         struct nfs4_lock_state *lsp;
 994         fl_owner_t fl_owner;
 995         pid_t fl_pid;
 996         bool ret = false;
 997
 998
 999         if (lockowner == NULL)
1000                 goto out;
1001
1002         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
1003                 goto out;
1004
1005         fl_owner = lockowner->l_owner;
1006         fl_pid = lockowner->l_pid;
1007         spin_lock(&state->state_lock);
1008         lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
1009         if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
1010                 nfs4_stateid_copy(dst, &lsp->ls_stateid);
1011                 ret = true;
1012         }
1013         spin_unlock(&state->state_lock);
1014         nfs4_put_lock_state(lsp);
1015 out:
1016         return ret;
1017 }
1018
1019 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1020 {
1021         int seq;
1022
1023         do {
1024                 seq = read_seqbegin(&state->seqlock);
1025                 nfs4_stateid_copy(dst, &state->stateid);
1026         } while (read_seqretry(&state->seqlock, seq));
1027 }
1028
1029 /*
1030  * Byte-range lock aware utility to initialize the stateid of read/write
1031  * requests.
1032  */
1033 void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1034                 fmode_t fmode, const struct nfs_lockowner *lockowner)
1035 {
1036         if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
1037                 return;
1038         if (nfs4_copy_lock_stateid(dst, state, lockowner))
1039                 return;
1040         nfs4_copy_open_stateid(dst, state);
1041 }
1042
1043 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1044 {
1045         struct nfs_seqid *new;
1046
1047         new = kmalloc(sizeof(*new), gfp_mask);
1048         if (new != NULL) {
1049                 new->sequence = counter;
1050                 INIT_LIST_HEAD(&new->list);
1051                 new->task = NULL;
1052         }
1053         return new;
1054 }
1055
1056 void nfs_release_seqid(struct nfs_seqid *seqid)
1057 {
1058         struct nfs_seqid_counter *sequence;
1059
1060         if (list_empty(&seqid->list))
1061                 return;
1062         sequence = seqid->sequence;
1063         spin_lock(&sequence->lock);
1064         list_del_init(&seqid->list);
1065         if (!list_empty(&sequence->list)) {
1066                 struct nfs_seqid *next;
1067
1068                 next = list_first_entry(&sequence->list,
1069                                 struct nfs_seqid, list);
1070                 rpc_wake_up_queued_task(&sequence->wait, next->task);
1071         }
1072         spin_unlock(&sequence->lock);
1073 }
1074
1075 void nfs_free_seqid(struct nfs_seqid *seqid)
1076 {
1077         nfs_release_seqid(seqid);
1078         kfree(seqid);
1079 }
1080
1081 /*
1082  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1083  * failed with a seqid incrementing error -
1084  * see comments nfs_fs.h:seqid_mutating_error()
1085  */
1086 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1087 {
1088         switch (status) {
1089                 case 0:
1090                         break;
1091                 case -NFS4ERR_BAD_SEQID:
1092                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1093                                 return;
1094                         pr_warn_ratelimited("NFS: v4 server returned a bad"
1095                                         " sequence-id error on an"
1096                                         " unconfirmed sequence %p!\n",
1097                                         seqid->sequence);
1098                 case -NFS4ERR_STALE_CLIENTID:
1099                 case -NFS4ERR_STALE_STATEID:
1100                 case -NFS4ERR_BAD_STATEID:
1101                 case -NFS4ERR_BADXDR:
1102                 case -NFS4ERR_RESOURCE:
1103                 case -NFS4ERR_NOFILEHANDLE:
1104                         /* Non-seqid mutating errors */
1105                         return;
1106         };
1107         /*
1108          * Note: no locking needed as we are guaranteed to be first
1109          * on the sequence list
1110          */
1111         seqid->sequence->counter++;
1112 }
1113
1114 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1115 {
1116         struct nfs4_state_owner *sp = container_of(seqid->sequence,
1117                                         struct nfs4_state_owner, so_seqid);
1118         struct nfs_server *server = sp->so_server;
1119
1120         if (status == -NFS4ERR_BAD_SEQID)
1121                 nfs4_drop_state_owner(sp);
1122         if (!nfs4_has_session(server->nfs_client))
1123                 nfs_increment_seqid(status, seqid);
1124 }
1125
1126 /*
1127  * Increment the seqid if the LOCK/LOCKU succeeded, or
1128  * failed with a seqid incrementing error -
1129  * see comments nfs_fs.h:seqid_mutating_error()
1130  */
1131 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1132 {
1133         nfs_increment_seqid(status, seqid);
1134 }
1135
1136 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1137 {
1138         struct nfs_seqid_counter *sequence = seqid->sequence;
1139         int status = 0;
1140
1141         spin_lock(&sequence->lock);
1142         seqid->task = task;
1143         if (list_empty(&seqid->list))
1144                 list_add_tail(&seqid->list, &sequence->list);
1145         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1146                 goto unlock;
1147         rpc_sleep_on(&sequence->wait, task, NULL);
1148         status = -EAGAIN;
1149 unlock:
1150         spin_unlock(&sequence->lock);
1151         return status;
1152 }
1153
1154 static int nfs4_run_state_manager(void *);
1155
1156 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1157 {
1158         smp_mb__before_clear_bit();
1159         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1160         smp_mb__after_clear_bit();
1161         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1162         rpc_wake_up(&clp->cl_rpcwaitq);
1163 }
1164
1165 /*
1166  * Schedule the nfs_client asynchronous state management routine
1167  */
1168 void nfs4_schedule_state_manager(struct nfs_client *clp)
1169 {
1170         struct task_struct *task;
1171         char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1172
1173         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1174                 return;
1175         __module_get(THIS_MODULE);
1176         atomic_inc(&clp->cl_count);
1177
1178         /* The rcu_read_lock() is not strictly necessary, as the state
1179          * manager is the only thread that ever changes the rpc_xprt
1180          * after it's initialized.  At this point, we're single threaded. */
1181         rcu_read_lock();
1182         snprintf(buf, sizeof(buf), "%s-manager",
1183                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1184         rcu_read_unlock();
1185         task = kthread_run(nfs4_run_state_manager, clp, buf);
1186         if (IS_ERR(task)) {
1187                 printk(KERN_ERR "%s: kthread_run: %ld\n",
1188                         __func__, PTR_ERR(task));
1189                 nfs4_clear_state_manager_bit(clp);
1190                 nfs_put_client(clp);
1191                 module_put(THIS_MODULE);
1192         }
1193 }
1194
1195 /*
1196  * Schedule a lease recovery attempt
1197  */
1198 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1199 {
1200         if (!clp)
1201                 return;
1202         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1203                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1204         dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1205                         clp->cl_hostname);
1206         nfs4_schedule_state_manager(clp);
1207 }
1208 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1209
1210 /*
1211  * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1212  * @clp: client to process
1213  *
1214  * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1215  * resend of the SETCLIENTID and hence re-establish the
1216  * callback channel. Then return all existing delegations.
1217  */
1218 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1219 {
1220         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1221         nfs_expire_all_delegations(clp);
1222         dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1223                         clp->cl_hostname);
1224 }
1225
1226 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1227 {
1228         nfs40_handle_cb_pathdown(clp);
1229         nfs4_schedule_state_manager(clp);
1230 }
1231
1232 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1233 {
1234
1235         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1236         /* Don't recover state that expired before the reboot */
1237         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1238                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1239                 return 0;
1240         }
1241         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1242         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1243         return 1;
1244 }
1245
1246 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1247 {
1248         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1249         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1250         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1251         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1252         return 1;
1253 }
1254
1255 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1256 {
1257         struct nfs_client *clp = server->nfs_client;
1258
1259         nfs4_state_mark_reclaim_nograce(clp, state);
1260         dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1261                         clp->cl_hostname);
1262         nfs4_schedule_state_manager(clp);
1263 }
1264 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1265
1266 void nfs_inode_find_state_and_recover(struct inode *inode,
1267                 const nfs4_stateid *stateid)
1268 {
1269         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1270         struct nfs_inode *nfsi = NFS_I(inode);
1271         struct nfs_open_context *ctx;
1272         struct nfs4_state *state;
1273         bool found = false;
1274
1275         spin_lock(&inode->i_lock);
1276         list_for_each_entry(ctx, &nfsi->open_files, list) {
1277                 state = ctx->state;
1278                 if (state == NULL)
1279                         continue;
1280                 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1281                         continue;
1282                 if (!nfs4_stateid_match(&state->stateid, stateid))
1283                         continue;
1284                 nfs4_state_mark_reclaim_nograce(clp, state);
1285                 found = true;
1286         }
1287         spin_unlock(&inode->i_lock);
1288         if (found)
1289                 nfs4_schedule_state_manager(clp);
1290 }
1291
1292
1293 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1294 {
1295         struct inode *inode = state->inode;
1296         struct nfs_inode *nfsi = NFS_I(inode);
1297         struct file_lock *fl;
1298         int status = 0;
1299
1300         if (inode->i_flock == NULL)
1301                 return 0;
1302
1303         /* Guard against delegation returns and new lock/unlock calls */
1304         down_write(&nfsi->rwsem);
1305         /* Protect inode->i_flock using the BKL */
1306         lock_flocks();
1307         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1308                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1309                         continue;
1310                 if (nfs_file_open_context(fl->fl_file)->state != state)
1311                         continue;
1312                 unlock_flocks();
1313                 status = ops->recover_lock(state, fl);
1314                 switch (status) {
1315                         case 0:
1316                                 break;
1317                         case -ESTALE:
1318                         case -NFS4ERR_ADMIN_REVOKED:
1319                         case -NFS4ERR_STALE_STATEID:
1320                         case -NFS4ERR_BAD_STATEID:
1321                         case -NFS4ERR_EXPIRED:
1322                         case -NFS4ERR_NO_GRACE:
1323                         case -NFS4ERR_STALE_CLIENTID:
1324                         case -NFS4ERR_BADSESSION:
1325                         case -NFS4ERR_BADSLOT:
1326                         case -NFS4ERR_BAD_HIGH_SLOT:
1327                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1328                                 goto out;
1329                         default:
1330                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1331                                         "Zeroing state\n", __func__, status);
1332                         case -ENOMEM:
1333                         case -NFS4ERR_DENIED:
1334                         case -NFS4ERR_RECLAIM_BAD:
1335                         case -NFS4ERR_RECLAIM_CONFLICT:
1336                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1337                                 status = 0;
1338                 }
1339                 lock_flocks();
1340         }
1341         unlock_flocks();
1342 out:
1343         up_write(&nfsi->rwsem);
1344         return status;
1345 }
1346
1347 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1348 {
1349         struct nfs4_state *state;
1350         struct nfs4_lock_state *lock;
1351         int status = 0;
1352
1353         /* Note: we rely on the sp->so_states list being ordered
1354          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1355          * states first.
1356          * This is needed to ensure that the server won't give us any
1357          * read delegations that we have to return if, say, we are
1358          * recovering after a network partition or a reboot from a
1359          * server that doesn't support a grace period.
1360          */
1361 restart:
1362         spin_lock(&sp->so_lock);
1363         list_for_each_entry(state, &sp->so_states, open_states) {
1364                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1365                         continue;
1366                 if (state->state == 0)
1367                         continue;
1368                 atomic_inc(&state->count);
1369                 spin_unlock(&sp->so_lock);
1370                 status = ops->recover_open(sp, state);
1371                 if (status >= 0) {
1372                         status = nfs4_reclaim_locks(state, ops);
1373                         if (status >= 0) {
1374                                 spin_lock(&state->state_lock);
1375                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1376                                         if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1377                                                 pr_warn_ratelimited("NFS: "
1378                                                         "%s: Lock reclaim "
1379                                                         "failed!\n", __func__);
1380                                 }
1381                                 spin_unlock(&state->state_lock);
1382                                 nfs4_put_open_state(state);
1383                                 goto restart;
1384                         }
1385                 }
1386                 switch (status) {
1387                         default:
1388                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1389                                         "Zeroing state\n", __func__, status);
1390                         case -ENOENT:
1391                         case -ENOMEM:
1392                         case -ESTALE:
1393                                 /*
1394                                  * Open state on this file cannot be recovered
1395                                  * All we can do is revert to using the zero stateid.
1396                                  */
1397                                 memset(&state->stateid, 0,
1398                                         sizeof(state->stateid));
1399                                 /* Mark the file as being 'closed' */
1400                                 state->state = 0;
1401                                 break;
1402                         case -EKEYEXPIRED:
1403                                 /*
1404                                  * User RPCSEC_GSS context has expired.
1405                                  * We cannot recover this stateid now, so
1406                                  * skip it and allow recovery thread to
1407                                  * proceed.
1408                                  */
1409                                 break;
1410                         case -NFS4ERR_ADMIN_REVOKED:
1411                         case -NFS4ERR_STALE_STATEID:
1412                         case -NFS4ERR_BAD_STATEID:
1413                         case -NFS4ERR_RECLAIM_BAD:
1414                         case -NFS4ERR_RECLAIM_CONFLICT:
1415                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1416                                 break;
1417                         case -NFS4ERR_EXPIRED:
1418                         case -NFS4ERR_NO_GRACE:
1419                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1420                         case -NFS4ERR_STALE_CLIENTID:
1421                         case -NFS4ERR_BADSESSION:
1422                         case -NFS4ERR_BADSLOT:
1423                         case -NFS4ERR_BAD_HIGH_SLOT:
1424                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1425                                 goto out_err;
1426                 }
1427                 nfs4_put_open_state(state);
1428                 goto restart;
1429         }
1430         spin_unlock(&sp->so_lock);
1431         return 0;
1432 out_err:
1433         nfs4_put_open_state(state);
1434         return status;
1435 }
1436
1437 static void nfs4_clear_open_state(struct nfs4_state *state)
1438 {
1439         struct nfs4_lock_state *lock;
1440
1441         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1442         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1443         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1444         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1445         spin_lock(&state->state_lock);
1446         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1447                 lock->ls_seqid.flags = 0;
1448                 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1449         }
1450         spin_unlock(&state->state_lock);
1451 }
1452
1453 static void nfs4_reset_seqids(struct nfs_server *server,
1454         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1455 {
1456         struct nfs_client *clp = server->nfs_client;
1457         struct nfs4_state_owner *sp;
1458         struct rb_node *pos;
1459         struct nfs4_state *state;
1460
1461         spin_lock(&clp->cl_lock);
1462         for (pos = rb_first(&server->state_owners);
1463              pos != NULL;
1464              pos = rb_next(pos)) {
1465                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1466                 sp->so_seqid.flags = 0;
1467                 spin_lock(&sp->so_lock);
1468                 list_for_each_entry(state, &sp->so_states, open_states) {
1469                         if (mark_reclaim(clp, state))
1470                                 nfs4_clear_open_state(state);
1471                 }
1472                 spin_unlock(&sp->so_lock);
1473         }
1474         spin_unlock(&clp->cl_lock);
1475 }
1476
1477 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1478         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1479 {
1480         struct nfs_server *server;
1481
1482         rcu_read_lock();
1483         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1484                 nfs4_reset_seqids(server, mark_reclaim);
1485         rcu_read_unlock();
1486 }
1487
1488 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1489 {
1490         /* Mark all delegations for reclaim */
1491         nfs_delegation_mark_reclaim(clp);
1492         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1493 }
1494
1495 static void nfs4_reclaim_complete(struct nfs_client *clp,
1496                                  const struct nfs4_state_recovery_ops *ops)
1497 {
1498         /* Notify the server we're done reclaiming our state */
1499         if (ops->reclaim_complete)
1500                 (void)ops->reclaim_complete(clp);
1501 }
1502
1503 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1504 {
1505         struct nfs_client *clp = server->nfs_client;
1506         struct nfs4_state_owner *sp;
1507         struct rb_node *pos;
1508         struct nfs4_state *state;
1509
1510         spin_lock(&clp->cl_lock);
1511         for (pos = rb_first(&server->state_owners);
1512              pos != NULL;
1513              pos = rb_next(pos)) {
1514                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1515                 spin_lock(&sp->so_lock);
1516                 list_for_each_entry(state, &sp->so_states, open_states) {
1517                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1518                                                 &state->flags))
1519                                 continue;
1520                         nfs4_state_mark_reclaim_nograce(clp, state);
1521                 }
1522                 spin_unlock(&sp->so_lock);
1523         }
1524         spin_unlock(&clp->cl_lock);
1525 }
1526
1527 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1528 {
1529         struct nfs_server *server;
1530
1531         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1532                 return 0;
1533
1534         rcu_read_lock();
1535         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1536                 nfs4_clear_reclaim_server(server);
1537         rcu_read_unlock();
1538
1539         nfs_delegation_reap_unclaimed(clp);
1540         return 1;
1541 }
1542
1543 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1544 {
1545         if (!nfs4_state_clear_reclaim_reboot(clp))
1546                 return;
1547         nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1548 }
1549
1550 static void nfs_delegation_clear_all(struct nfs_client *clp)
1551 {
1552         nfs_delegation_mark_reclaim(clp);
1553         nfs_delegation_reap_unclaimed(clp);
1554 }
1555
1556 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1557 {
1558         nfs_delegation_clear_all(clp);
1559         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1560 }
1561
1562 static void nfs4_warn_keyexpired(const char *s)
1563 {
1564         printk_ratelimited(KERN_WARNING "Error: state manager"
1565                         " encountered RPCSEC_GSS session"
1566                         " expired against NFSv4 server %s.\n",
1567                         s);
1568 }
1569
1570 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1571 {
1572         switch (error) {
1573                 case 0:
1574                         break;
1575                 case -NFS4ERR_CB_PATH_DOWN:
1576                         nfs40_handle_cb_pathdown(clp);
1577                         break;
1578                 case -NFS4ERR_NO_GRACE:
1579                         nfs4_state_end_reclaim_reboot(clp);
1580                         break;
1581                 case -NFS4ERR_STALE_CLIENTID:
1582                 case -NFS4ERR_LEASE_MOVED:
1583                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1584                         nfs4_state_clear_reclaim_reboot(clp);
1585                         nfs4_state_start_reclaim_reboot(clp);
1586                         break;
1587                 case -NFS4ERR_EXPIRED:
1588                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1589                         nfs4_state_start_reclaim_nograce(clp);
1590                         break;
1591                 case -NFS4ERR_BADSESSION:
1592                 case -NFS4ERR_BADSLOT:
1593                 case -NFS4ERR_BAD_HIGH_SLOT:
1594                 case -NFS4ERR_DEADSESSION:
1595                 case -NFS4ERR_SEQ_FALSE_RETRY:
1596                 case -NFS4ERR_SEQ_MISORDERED:
1597                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1598                         /* Zero session reset errors */
1599                         break;
1600                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1601                         set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1602                         break;
1603                 case -EKEYEXPIRED:
1604                         /* Nothing we can do */
1605                         nfs4_warn_keyexpired(clp->cl_hostname);
1606                         break;
1607                 default:
1608                         dprintk("%s: failed to handle error %d for server %s\n",
1609                                         __func__, error, clp->cl_hostname);
1610                         return error;
1611         }
1612         dprintk("%s: handled error %d for server %s\n", __func__, error,
1613                         clp->cl_hostname);
1614         return 0;
1615 }
1616
1617 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1618 {
1619         struct nfs4_state_owner *sp;
1620         struct nfs_server *server;
1621         struct rb_node *pos;
1622         int status = 0;
1623
1624 restart:
1625         rcu_read_lock();
1626         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1627                 nfs4_purge_state_owners(server);
1628                 spin_lock(&clp->cl_lock);
1629                 for (pos = rb_first(&server->state_owners);
1630                      pos != NULL;
1631                      pos = rb_next(pos)) {
1632                         sp = rb_entry(pos,
1633                                 struct nfs4_state_owner, so_server_node);
1634                         if (!test_and_clear_bit(ops->owner_flag_bit,
1635                                                         &sp->so_flags))
1636                                 continue;
1637                         atomic_inc(&sp->so_count);
1638                         spin_unlock(&clp->cl_lock);
1639                         rcu_read_unlock();
1640
1641                         status = nfs4_reclaim_open_state(sp, ops);
1642                         if (status < 0) {
1643                                 set_bit(ops->owner_flag_bit, &sp->so_flags);
1644                                 nfs4_put_state_owner(sp);
1645                                 return nfs4_recovery_handle_error(clp, status);
1646                         }
1647
1648                         nfs4_put_state_owner(sp);
1649                         goto restart;
1650                 }
1651                 spin_unlock(&clp->cl_lock);
1652         }
1653         rcu_read_unlock();
1654         return status;
1655 }
1656
1657 static int nfs4_check_lease(struct nfs_client *clp)
1658 {
1659         struct rpc_cred *cred;
1660         const struct nfs4_state_maintenance_ops *ops =
1661                 clp->cl_mvops->state_renewal_ops;
1662         int status;
1663
1664         /* Is the client already known to have an expired lease? */
1665         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1666                 return 0;
1667         spin_lock(&clp->cl_lock);
1668         cred = ops->get_state_renewal_cred_locked(clp);
1669         spin_unlock(&clp->cl_lock);
1670         if (cred == NULL) {
1671                 cred = nfs4_get_setclientid_cred(clp);
1672                 status = -ENOKEY;
1673                 if (cred == NULL)
1674                         goto out;
1675         }
1676         status = ops->renew_lease(clp, cred);
1677         put_rpccred(cred);
1678 out:
1679         return nfs4_recovery_handle_error(clp, status);
1680 }
1681
1682 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1683  * and for recoverable errors on EXCHANGE_ID for v4.1
1684  */
1685 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1686 {
1687         switch (status) {
1688         case -NFS4ERR_SEQ_MISORDERED:
1689                 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1690                         return -ESERVERFAULT;
1691                 /* Lease confirmation error: retry after purging the lease */
1692                 ssleep(1);
1693                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1694                 break;
1695         case -NFS4ERR_STALE_CLIENTID:
1696                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1697                 nfs4_state_clear_reclaim_reboot(clp);
1698                 nfs4_state_start_reclaim_reboot(clp);
1699                 break;
1700         case -NFS4ERR_CLID_INUSE:
1701                 pr_err("NFS: Server %s reports our clientid is in use\n",
1702                         clp->cl_hostname);
1703                 nfs_mark_client_ready(clp, -EPERM);
1704                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1705                 return -EPERM;
1706         case -EACCES:
1707                 if (clp->cl_machine_cred == NULL)
1708                         return -EACCES;
1709                 /* Handle case where the user hasn't set up machine creds */
1710                 nfs4_clear_machine_cred(clp);
1711         case -NFS4ERR_DELAY:
1712         case -ETIMEDOUT:
1713         case -EAGAIN:
1714                 ssleep(1);
1715                 break;
1716
1717         case -NFS4ERR_MINOR_VERS_MISMATCH:
1718                 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1719                         nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1720                 dprintk("%s: exit with error %d for server %s\n",
1721                                 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1722                 return -EPROTONOSUPPORT;
1723         case -EKEYEXPIRED:
1724                 nfs4_warn_keyexpired(clp->cl_hostname);
1725         case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1726                                  * in nfs4_exchange_id */
1727         default:
1728                 dprintk("%s: exit with error %d for server %s\n", __func__,
1729                                 status, clp->cl_hostname);
1730                 return status;
1731         }
1732         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1733         dprintk("%s: handled error %d for server %s\n", __func__, status,
1734                         clp->cl_hostname);
1735         return 0;
1736 }
1737
1738 static int nfs4_establish_lease(struct nfs_client *clp)
1739 {
1740         struct rpc_cred *cred;
1741         const struct nfs4_state_recovery_ops *ops =
1742                 clp->cl_mvops->reboot_recovery_ops;
1743         int status;
1744
1745         cred = ops->get_clid_cred(clp);
1746         if (cred == NULL)
1747                 return -ENOENT;
1748         status = ops->establish_clid(clp, cred);
1749         put_rpccred(cred);
1750         if (status != 0)
1751                 return status;
1752         pnfs_destroy_all_layouts(clp);
1753         return 0;
1754 }
1755
1756 /*
1757  * Returns zero or a negative errno.  NFS4ERR values are converted
1758  * to local errno values.
1759  */
1760 static int nfs4_reclaim_lease(struct nfs_client *clp)
1761 {
1762         int status;
1763
1764         status = nfs4_establish_lease(clp);
1765         if (status < 0)
1766                 return nfs4_handle_reclaim_lease_error(clp, status);
1767         if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1768                 nfs4_state_start_reclaim_nograce(clp);
1769         if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1770                 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1771         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1772         clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1773         return 0;
1774 }
1775
1776 static int nfs4_purge_lease(struct nfs_client *clp)
1777 {
1778         int status;
1779
1780         status = nfs4_establish_lease(clp);
1781         if (status < 0)
1782                 return nfs4_handle_reclaim_lease_error(clp, status);
1783         clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1784         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1785         nfs4_state_start_reclaim_nograce(clp);
1786         return 0;
1787 }
1788
1789 /**
1790  * nfs4_discover_server_trunking - Detect server IP address trunking
1791  *
1792  * @clp: nfs_client under test
1793  * @result: OUT: found nfs_client, or clp
1794  *
1795  * Returns zero or a negative errno.  If zero is returned,
1796  * an nfs_client pointer is planted in "result".
1797  *
1798  * Note: since we are invoked in process context, and
1799  * not from inside the state manager, we cannot use
1800  * nfs4_handle_reclaim_lease_error().
1801  */
1802 int nfs4_discover_server_trunking(struct nfs_client *clp,
1803                                   struct nfs_client **result)
1804 {
1805         const struct nfs4_state_recovery_ops *ops =
1806                                 clp->cl_mvops->reboot_recovery_ops;
1807         rpc_authflavor_t *flavors, flav, save;
1808         struct rpc_clnt *clnt;
1809         struct rpc_cred *cred;
1810         int i, len, status;
1811
1812         dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
1813
1814         len = NFS_MAX_SECFLAVORS;
1815         flavors = kcalloc(len, sizeof(*flavors), GFP_KERNEL);
1816         if (flavors == NULL) {
1817                 status = -ENOMEM;
1818                 goto out;
1819         }
1820         len = rpcauth_list_flavors(flavors, len);
1821         if (len < 0) {
1822                 status = len;
1823                 goto out_free;
1824         }
1825         clnt = clp->cl_rpcclient;
1826         save = clnt->cl_auth->au_flavor;
1827         i = 0;
1828
1829         mutex_lock(&nfs_clid_init_mutex);
1830         status  = -ENOENT;
1831 again:
1832         cred = ops->get_clid_cred(clp);
1833         if (cred == NULL)
1834                 goto out_unlock;
1835
1836         status = ops->detect_trunking(clp, result, cred);
1837         put_rpccred(cred);
1838         switch (status) {
1839         case 0:
1840                 break;
1841
1842         case -EACCES:
1843                 if (clp->cl_machine_cred == NULL)
1844                         break;
1845                 /* Handle case where the user hasn't set up machine creds */
1846                 nfs4_clear_machine_cred(clp);
1847         case -NFS4ERR_DELAY:
1848         case -ETIMEDOUT:
1849         case -EAGAIN:
1850                 ssleep(1);
1851                 dprintk("NFS: %s after status %d, retrying\n",
1852                         __func__, status);
1853                 goto again;
1854
1855         case -NFS4ERR_CLID_INUSE:
1856         case -NFS4ERR_WRONGSEC:
1857                 status = -EPERM;
1858                 if (i >= len)
1859                         break;
1860
1861                 flav = flavors[i++];
1862                 if (flav == save)
1863                         flav = flavors[i++];
1864                 clnt = rpc_clone_client_set_auth(clnt, flav);
1865                 if (IS_ERR(clnt)) {
1866                         status = PTR_ERR(clnt);
1867                         break;
1868                 }
1869                 clp->cl_rpcclient = clnt;
1870                 goto again;
1871
1872         case -NFS4ERR_MINOR_VERS_MISMATCH:
1873                 status = -EPROTONOSUPPORT;
1874                 break;
1875
1876         case -EKEYEXPIRED:
1877                 nfs4_warn_keyexpired(clp->cl_hostname);
1878         case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1879                                  * in nfs4_exchange_id */
1880                 status = -EKEYEXPIRED;
1881         }
1882
1883 out_unlock:
1884         mutex_unlock(&nfs_clid_init_mutex);
1885 out_free:
1886         kfree(flavors);
1887 out:
1888         dprintk("NFS: %s: status = %d\n", __func__, status);
1889         return status;
1890 }
1891
1892 #ifdef CONFIG_NFS_V4_1
1893 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
1894 {
1895         struct nfs_client *clp = session->clp;
1896
1897         switch (err) {
1898         default:
1899                 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1900                 break;
1901         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1902                 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1903         }
1904         nfs4_schedule_lease_recovery(clp);
1905 }
1906 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1907
1908 void nfs41_handle_recall_slot(struct nfs_client *clp)
1909 {
1910         set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1911         dprintk("%s: scheduling slot recall for server %s\n", __func__,
1912                         clp->cl_hostname);
1913         nfs4_schedule_state_manager(clp);
1914 }
1915
1916 static void nfs4_reset_all_state(struct nfs_client *clp)
1917 {
1918         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1919                 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1920                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1921                 nfs4_state_start_reclaim_nograce(clp);
1922                 dprintk("%s: scheduling reset of all state for server %s!\n",
1923                                 __func__, clp->cl_hostname);
1924                 nfs4_schedule_state_manager(clp);
1925         }
1926 }
1927
1928 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1929 {
1930         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1931                 nfs4_state_start_reclaim_reboot(clp);
1932                 dprintk("%s: server %s rebooted!\n", __func__,
1933                                 clp->cl_hostname);
1934                 nfs4_schedule_state_manager(clp);
1935         }
1936 }
1937
1938 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1939 {
1940         nfs4_reset_all_state(clp);
1941         dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
1942 }
1943
1944 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1945 {
1946         /* This will need to handle layouts too */
1947         nfs_expire_all_delegations(clp);
1948         dprintk("%s: Recallable state revoked on server %s!\n", __func__,
1949                         clp->cl_hostname);
1950 }
1951
1952 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
1953 {
1954         nfs_expire_all_delegations(clp);
1955         if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1956                 nfs4_schedule_state_manager(clp);
1957         dprintk("%s: server %s declared a backchannel fault\n", __func__,
1958                         clp->cl_hostname);
1959 }
1960
1961 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1962 {
1963         if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
1964                 &clp->cl_state) == 0)
1965                 nfs4_schedule_state_manager(clp);
1966 }
1967
1968 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1969 {
1970         if (!flags)
1971                 return;
1972
1973         dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
1974                 __func__, clp->cl_hostname, clp->cl_clientid, flags);
1975
1976         if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1977                 nfs41_handle_server_reboot(clp);
1978         if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1979                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1980                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1981                             SEQ4_STATUS_LEASE_MOVED))
1982                 nfs41_handle_state_revoked(clp);
1983         if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1984                 nfs41_handle_recallable_state_revoked(clp);
1985         if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
1986                 nfs41_handle_backchannel_fault(clp);
1987         else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1988                                 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1989                 nfs41_handle_cb_path_down(clp);
1990 }
1991
1992 static int nfs4_reset_session(struct nfs_client *clp)
1993 {
1994         struct rpc_cred *cred;
1995         int status;
1996
1997         if (!nfs4_has_session(clp))
1998                 return 0;
1999         nfs4_begin_drain_session(clp);
2000         cred = nfs4_get_exchange_id_cred(clp);
2001         status = nfs4_proc_destroy_session(clp->cl_session, cred);
2002         if (status && status != -NFS4ERR_BADSESSION &&
2003             status != -NFS4ERR_DEADSESSION) {
2004                 status = nfs4_recovery_handle_error(clp, status);
2005                 goto out;
2006         }
2007
2008         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2009         status = nfs4_proc_create_session(clp, cred);
2010         if (status) {
2011                 dprintk("%s: session reset failed with status %d for server %s!\n",
2012                         __func__, status, clp->cl_hostname);
2013                 status = nfs4_handle_reclaim_lease_error(clp, status);
2014                 goto out;
2015         }
2016         nfs41_finish_session_reset(clp);
2017         dprintk("%s: session reset was successful for server %s!\n",
2018                         __func__, clp->cl_hostname);
2019 out:
2020         if (cred)
2021                 put_rpccred(cred);
2022         return status;
2023 }
2024
2025 static int nfs4_recall_slot(struct nfs_client *clp)
2026 {
2027         struct nfs4_slot_table *fc_tbl;
2028         struct nfs4_slot *new, *old;
2029         int i;
2030
2031         if (!nfs4_has_session(clp))
2032                 return 0;
2033         nfs4_begin_drain_session(clp);
2034         fc_tbl = &clp->cl_session->fc_slot_table;
2035         new = nfs4_alloc_slots(fc_tbl, fc_tbl->target_highest_slotid + 1, GFP_NOFS);
2036         if (!new)
2037                 return -ENOMEM;
2038
2039         spin_lock(&fc_tbl->slot_tbl_lock);
2040         for (i = 0; i <= fc_tbl->target_highest_slotid; i++)
2041                 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
2042         old = fc_tbl->slots;
2043         fc_tbl->slots = new;
2044         fc_tbl->max_slots = fc_tbl->target_highest_slotid + 1;
2045         fc_tbl->max_slotid = fc_tbl->target_highest_slotid;
2046         clp->cl_session->fc_attrs.max_reqs = fc_tbl->max_slots;
2047         spin_unlock(&fc_tbl->slot_tbl_lock);
2048
2049         kfree(old);
2050         return 0;
2051 }
2052
2053 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2054 {
2055         struct rpc_cred *cred;
2056         int ret;
2057
2058         if (!nfs4_has_session(clp))
2059                 return 0;
2060         nfs4_begin_drain_session(clp);
2061         cred = nfs4_get_exchange_id_cred(clp);
2062         ret = nfs4_proc_bind_conn_to_session(clp, cred);
2063         if (cred)
2064                 put_rpccred(cred);
2065         clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2066         switch (ret) {
2067         case 0:
2068                 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2069                         __func__, clp->cl_hostname);
2070                 break;
2071         case -NFS4ERR_DELAY:
2072                 ssleep(1);
2073                 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2074                 break;
2075         default:
2076                 return nfs4_recovery_handle_error(clp, ret);
2077         }
2078         return 0;
2079 }
2080 #else /* CONFIG_NFS_V4_1 */
2081 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2082 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
2083 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
2084
2085 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2086 {
2087         return 0;
2088 }
2089 #endif /* CONFIG_NFS_V4_1 */
2090
2091 static void nfs4_state_manager(struct nfs_client *clp)
2092 {
2093         int status = 0;
2094         const char *section = "", *section_sep = "";
2095
2096         /* Ensure exclusive access to NFSv4 state */
2097         do {
2098                 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2099                         section = "purge state";
2100                         status = nfs4_purge_lease(clp);
2101                         if (status < 0)
2102                                 goto out_error;
2103                         continue;
2104                 }
2105
2106                 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2107                         section = "lease expired";
2108                         /* We're going to have to re-establish a clientid */
2109                         status = nfs4_reclaim_lease(clp);
2110                         if (status < 0)
2111                                 goto out_error;
2112                         continue;
2113                 }
2114
2115                 /* Initialize or reset the session */
2116                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2117                         section = "reset session";
2118                         status = nfs4_reset_session(clp);
2119                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2120                                 continue;
2121                         if (status < 0)
2122                                 goto out_error;
2123                 }
2124
2125                 /* Send BIND_CONN_TO_SESSION */
2126                 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2127                                 &clp->cl_state)) {
2128                         section = "bind conn to session";
2129                         status = nfs4_bind_conn_to_session(clp);
2130                         if (status < 0)
2131                                 goto out_error;
2132                         continue;
2133                 }
2134
2135                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2136                         section = "check lease";
2137                         status = nfs4_check_lease(clp);
2138                         if (status < 0)
2139                                 goto out_error;
2140                         continue;
2141                 }
2142
2143                 /* Recall session slots */
2144                 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)) {
2145                         section = "recall slot";
2146                         status = nfs4_recall_slot(clp);
2147                         if (status < 0)
2148                                 goto out_error;
2149                         continue;
2150                 }
2151
2152                 /* First recover reboot state... */
2153                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2154                         section = "reclaim reboot";
2155                         status = nfs4_do_reclaim(clp,
2156                                 clp->cl_mvops->reboot_recovery_ops);
2157                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2158                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
2159                                 continue;
2160                         nfs4_state_end_reclaim_reboot(clp);
2161                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2162                                 continue;
2163                         if (status < 0)
2164                                 goto out_error;
2165                 }
2166
2167                 /* Now recover expired state... */
2168                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2169                         section = "reclaim nograce";
2170                         status = nfs4_do_reclaim(clp,
2171                                 clp->cl_mvops->nograce_recovery_ops);
2172                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
2173                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
2174                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
2175                                 continue;
2176                         if (status < 0)
2177                                 goto out_error;
2178                 }
2179
2180                 nfs4_end_drain_session(clp);
2181                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2182                         nfs_client_return_marked_delegations(clp);
2183                         continue;
2184                 }
2185
2186                 nfs4_clear_state_manager_bit(clp);
2187                 /* Did we race with an attempt to give us more work? */
2188                 if (clp->cl_state == 0)
2189                         break;
2190                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2191                         break;
2192         } while (atomic_read(&clp->cl_count) > 1);
2193         return;
2194 out_error:
2195         if (strlen(section))
2196                 section_sep = ": ";
2197         pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2198                         " with error %d\n", section_sep, section,
2199                         clp->cl_hostname, -status);
2200         ssleep(1);
2201         nfs4_end_drain_session(clp);
2202         nfs4_clear_state_manager_bit(clp);
2203 }
2204
2205 static int nfs4_run_state_manager(void *ptr)
2206 {
2207         struct nfs_client *clp = ptr;
2208
2209         allow_signal(SIGKILL);
2210         nfs4_state_manager(clp);
2211         nfs_put_client(clp);
2212         module_put_and_exit(0);
2213         return 0;
2214 }
2215
2216 /*
2217  * Local variables:
2218  *  c-basic-offset: 8
2219  * End:
2220  */