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 "nfs4_fs.h"
  55 #include "callback.h"
  56 #include "delegation.h"
  57 #include "internal.h"
  58 #include "pnfs.h"
  59
  60 #define OPENOWNER_POOL_SIZE     8
  61
  62 const nfs4_stateid zero_stateid;
  63
  64 static LIST_HEAD(nfs4_clientid_list);
  65
  66 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
  67 {
  68         struct nfs4_setclientid_res clid = {
  69                 .clientid = clp->cl_clientid,
  70                 .confirm = clp->cl_confirm,
  71         };
  72         unsigned short port;
  73         int status;
  74
  75         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
  76                 goto do_confirm;
  77         port = nfs_callback_tcpport;
  78         if (clp->cl_addr.ss_family == AF_INET6)
  79                 port = nfs_callback_tcpport6;
  80
  81         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
  82         if (status != 0)
  83                 goto out;
  84         clp->cl_clientid = clid.clientid;
  85         clp->cl_confirm = clid.confirm;
  86         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  87 do_confirm:
  88         status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
  89         if (status != 0)
  90                 goto out;
  91         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  92         nfs4_schedule_state_renewal(clp);
  93 out:
  94         return status;
  95 }
  96
  97 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
  98 {
  99         struct rpc_cred *cred = NULL;
 100
 101         if (clp->cl_machine_cred != NULL)
 102                 cred = get_rpccred(clp->cl_machine_cred);
 103         return cred;
 104 }
 105
 106 static void nfs4_clear_machine_cred(struct nfs_client *clp)
 107 {
 108         struct rpc_cred *cred;
 109
 110         spin_lock(&clp->cl_lock);
 111         cred = clp->cl_machine_cred;
 112         clp->cl_machine_cred = NULL;
 113         spin_unlock(&clp->cl_lock);
 114         if (cred != NULL)
 115                 put_rpccred(cred);
 116 }
 117
 118 static struct rpc_cred *
 119 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
 120 {
 121         struct rpc_cred *cred = NULL;
 122         struct nfs4_state_owner *sp;
 123         struct rb_node *pos;
 124
 125         for (pos = rb_first(&server->state_owners);
 126              pos != NULL;
 127              pos = rb_next(pos)) {
 128                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 129                 if (list_empty(&sp->so_states))
 130                         continue;
 131                 cred = get_rpccred(sp->so_cred);
 132                 break;
 133         }
 134         return cred;
 135 }
 136
 137 /**
 138  * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
 139  * @clp: client state handle
 140  *
 141  * Returns an rpc_cred with reference count bumped, or NULL.
 142  * Caller must hold clp->cl_lock.
 143  */
 144 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 145 {
 146         struct rpc_cred *cred = NULL;
 147         struct nfs_server *server;
 148
 149         /* Use machine credentials if available */
 150         cred = nfs4_get_machine_cred_locked(clp);
 151         if (cred != NULL)
 152                 goto out;
 153
 154         rcu_read_lock();
 155         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 156                 cred = nfs4_get_renew_cred_server_locked(server);
 157                 if (cred != NULL)
 158                         break;
 159         }
 160         rcu_read_unlock();
 161
 162 out:
 163         return cred;
 164 }
 165
 166 #if defined(CONFIG_NFS_V4_1)
 167
 168 static int nfs41_setup_state_renewal(struct nfs_client *clp)
 169 {
 170         int status;
 171         struct nfs_fsinfo fsinfo;
 172
 173         if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
 174                 nfs4_schedule_state_renewal(clp);
 175                 return 0;
 176         }
 177
 178         status = nfs4_proc_get_lease_time(clp, &fsinfo);
 179         if (status == 0) {
 180                 /* Update lease time and schedule renewal */
 181                 spin_lock(&clp->cl_lock);
 182                 clp->cl_lease_time = fsinfo.lease_time * HZ;
 183                 clp->cl_last_renewal = jiffies;
 184                 spin_unlock(&clp->cl_lock);
 185
 186                 nfs4_schedule_state_renewal(clp);
 187         }
 188
 189         return status;
 190 }
 191
 192 /*
 193  * Back channel returns NFS4ERR_DELAY for new requests when
 194  * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 195  * is ended.
 196  */
 197 static void nfs4_end_drain_session(struct nfs_client *clp)
 198 {
 199         struct nfs4_session *ses = clp->cl_session;
 200         struct nfs4_slot_table *tbl;
 201         int max_slots;
 202
 203         if (ses == NULL)
 204                 return;
 205         tbl = &ses->fc_slot_table;
 206         if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 207                 spin_lock(&tbl->slot_tbl_lock);
 208                 max_slots = tbl->max_slots;
 209                 while (max_slots--) {
 210                         if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
 211                                                 nfs4_set_task_privileged,
 212                                                 NULL) == NULL)
 213                                 break;
 214                 }
 215                 spin_unlock(&tbl->slot_tbl_lock);
 216         }
 217 }
 218
 219 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
 220 {
 221         spin_lock(&tbl->slot_tbl_lock);
 222         if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
 223                 INIT_COMPLETION(tbl->complete);
 224                 spin_unlock(&tbl->slot_tbl_lock);
 225                 return wait_for_completion_interruptible(&tbl->complete);
 226         }
 227         spin_unlock(&tbl->slot_tbl_lock);
 228         return 0;
 229 }
 230
 231 static int nfs4_begin_drain_session(struct nfs_client *clp)
 232 {
 233         struct nfs4_session *ses = clp->cl_session;
 234         int ret = 0;
 235
 236         set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
 237         /* back channel */
 238         ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
 239         if (ret)
 240                 return ret;
 241         /* fore channel */
 242         return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
 243 }
 244
 245 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 246 {
 247         int status;
 248
 249         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
 250                 goto do_confirm;
 251         nfs4_begin_drain_session(clp);
 252         status = nfs4_proc_exchange_id(clp, cred);
 253         if (status != 0)
 254                 goto out;
 255         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 256 do_confirm:
 257         status = nfs4_proc_create_session(clp);
 258         if (status != 0)
 259                 goto out;
 260         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 261         nfs41_setup_state_renewal(clp);
 262         nfs_mark_client_ready(clp, NFS_CS_READY);
 263 out:
 264         return status;
 265 }
 266
 267 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 268 {
 269         struct rpc_cred *cred;
 270
 271         spin_lock(&clp->cl_lock);
 272         cred = nfs4_get_machine_cred_locked(clp);
 273         spin_unlock(&clp->cl_lock);
 274         return cred;
 275 }
 276
 277 #endif /* CONFIG_NFS_V4_1 */
 278
 279 static struct rpc_cred *
 280 nfs4_get_setclientid_cred_server(struct nfs_server *server)
 281 {
 282         struct nfs_client *clp = server->nfs_client;
 283         struct rpc_cred *cred = NULL;
 284         struct nfs4_state_owner *sp;
 285         struct rb_node *pos;
 286
 287         spin_lock(&clp->cl_lock);
 288         pos = rb_first(&server->state_owners);
 289         if (pos != NULL) {
 290                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 291                 cred = get_rpccred(sp->so_cred);
 292         }
 293         spin_unlock(&clp->cl_lock);
 294         return cred;
 295 }
 296
 297 /**
 298  * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 299  * @clp: client state handle
 300  *
 301  * Returns an rpc_cred with reference count bumped, or NULL.
 302  */
 303 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 304 {
 305         struct nfs_server *server;
 306         struct rpc_cred *cred;
 307
 308         spin_lock(&clp->cl_lock);
 309         cred = nfs4_get_machine_cred_locked(clp);
 310         spin_unlock(&clp->cl_lock);
 311         if (cred != NULL)
 312                 goto out;
 313
 314         rcu_read_lock();
 315         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 316                 cred = nfs4_get_setclientid_cred_server(server);
 317                 if (cred != NULL)
 318                         break;
 319         }
 320         rcu_read_unlock();
 321
 322 out:
 323         return cred;
 324 }
 325
 326 static struct nfs4_state_owner *
 327 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
 328 {
 329         struct rb_node **p = &server->state_owners.rb_node,
 330                        *parent = NULL;
 331         struct nfs4_state_owner *sp;
 332
 333         while (*p != NULL) {
 334                 parent = *p;
 335                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 336
 337                 if (cred < sp->so_cred)
 338                         p = &parent->rb_left;
 339                 else if (cred > sp->so_cred)
 340                         p = &parent->rb_right;
 341                 else {
 342                         if (!list_empty(&sp->so_lru))
 343                                 list_del_init(&sp->so_lru);
 344                         atomic_inc(&sp->so_count);
 345                         return sp;
 346                 }
 347         }
 348         return NULL;
 349 }
 350
 351 static struct nfs4_state_owner *
 352 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
 353 {
 354         struct nfs_server *server = new->so_server;
 355         struct rb_node **p = &server->state_owners.rb_node,
 356                        *parent = NULL;
 357         struct nfs4_state_owner *sp;
 358         int err;
 359
 360         while (*p != NULL) {
 361                 parent = *p;
 362                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 363
 364                 if (new->so_cred < sp->so_cred)
 365                         p = &parent->rb_left;
 366                 else if (new->so_cred > sp->so_cred)
 367                         p = &parent->rb_right;
 368                 else {
 369                         if (!list_empty(&sp->so_lru))
 370                                 list_del_init(&sp->so_lru);
 371                         atomic_inc(&sp->so_count);
 372                         return sp;
 373                 }
 374         }
 375         err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
 376         if (err)
 377                 return ERR_PTR(err);
 378         rb_link_node(&new->so_server_node, parent, p);
 379         rb_insert_color(&new->so_server_node, &server->state_owners);
 380         return new;
 381 }
 382
 383 static void
 384 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
 385 {
 386         struct nfs_server *server = sp->so_server;
 387
 388         if (!RB_EMPTY_NODE(&sp->so_server_node))
 389                 rb_erase(&sp->so_server_node, &server->state_owners);
 390         ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
 391 }
 392
 393 static void
 394 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
 395 {
 396         sc->create_time = ktime_get();
 397         sc->flags = 0;
 398         sc->counter = 0;
 399         spin_lock_init(&sc->lock);
 400         INIT_LIST_HEAD(&sc->list);
 401         rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
 402 }
 403
 404 static void
 405 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
 406 {
 407         rpc_destroy_wait_queue(&sc->wait);
 408 }
 409
 410 /*
 411  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 412  * create a new state_owner.
 413  *
 414  */
 415 static struct nfs4_state_owner *
 416 nfs4_alloc_state_owner(struct nfs_server *server,
 417                 struct rpc_cred *cred,
 418                 gfp_t gfp_flags)
 419 {
 420         struct nfs4_state_owner *sp;
 421
 422         sp = kzalloc(sizeof(*sp), gfp_flags);
 423         if (!sp)
 424                 return NULL;
 425         sp->so_server = server;
 426         sp->so_cred = get_rpccred(cred);
 427         spin_lock_init(&sp->so_lock);
 428         INIT_LIST_HEAD(&sp->so_states);
 429         nfs4_init_seqid_counter(&sp->so_seqid);
 430         atomic_set(&sp->so_count, 1);
 431         INIT_LIST_HEAD(&sp->so_lru);
 432         return sp;
 433 }
 434
 435 static void
 436 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 437 {
 438         struct rb_node *rb_node = &sp->so_server_node;
 439
 440         if (!RB_EMPTY_NODE(rb_node)) {
 441                 struct nfs_server *server = sp->so_server;
 442                 struct nfs_client *clp = server->nfs_client;
 443
 444                 spin_lock(&clp->cl_lock);
 445                 if (!RB_EMPTY_NODE(rb_node)) {
 446                         rb_erase(rb_node, &server->state_owners);
 447                         RB_CLEAR_NODE(rb_node);
 448                 }
 449                 spin_unlock(&clp->cl_lock);
 450         }
 451 }
 452
 453 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
 454 {
 455         nfs4_destroy_seqid_counter(&sp->so_seqid);
 456         put_rpccred(sp->so_cred);
 457         kfree(sp);
 458 }
 459
 460 static void nfs4_gc_state_owners(struct nfs_server *server)
 461 {
 462         struct nfs_client *clp = server->nfs_client;
 463         struct nfs4_state_owner *sp, *tmp;
 464         unsigned long time_min, time_max;
 465         LIST_HEAD(doomed);
 466
 467         spin_lock(&clp->cl_lock);
 468         time_max = jiffies;
 469         time_min = (long)time_max - (long)clp->cl_lease_time;
 470         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 471                 /* NB: LRU is sorted so that oldest is at the head */
 472                 if (time_in_range(sp->so_expires, time_min, time_max))
 473                         break;
 474                 list_move(&sp->so_lru, &doomed);
 475                 nfs4_remove_state_owner_locked(sp);
 476         }
 477         spin_unlock(&clp->cl_lock);
 478
 479         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 480                 list_del(&sp->so_lru);
 481                 nfs4_free_state_owner(sp);
 482         }
 483 }
 484
 485 /**
 486  * nfs4_get_state_owner - Look up a state owner given a credential
 487  * @server: nfs_server to search
 488  * @cred: RPC credential to match
 489  *
 490  * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
 491  */
 492 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
 493                                               struct rpc_cred *cred,
 494                                               gfp_t gfp_flags)
 495 {
 496         struct nfs_client *clp = server->nfs_client;
 497         struct nfs4_state_owner *sp, *new;
 498
 499         spin_lock(&clp->cl_lock);
 500         sp = nfs4_find_state_owner_locked(server, cred);
 501         spin_unlock(&clp->cl_lock);
 502         if (sp != NULL)
 503                 goto out;
 504         new = nfs4_alloc_state_owner(server, cred, gfp_flags);
 505         if (new == NULL)
 506                 goto out;
 507         do {
 508                 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
 509                         break;
 510                 spin_lock(&clp->cl_lock);
 511                 sp = nfs4_insert_state_owner_locked(new);
 512                 spin_unlock(&clp->cl_lock);
 513         } while (sp == ERR_PTR(-EAGAIN));
 514         if (sp != new)
 515                 nfs4_free_state_owner(new);
 516 out:
 517         nfs4_gc_state_owners(server);
 518         return sp;
 519 }
 520
 521 /**
 522  * nfs4_put_state_owner - Release a nfs4_state_owner
 523  * @sp: state owner data to release
 524  *
 525  * Note that we keep released state owners on an LRU
 526  * list.
 527  * This caches valid state owners so that they can be
 528  * reused, to avoid the OPEN_CONFIRM on minor version 0.
 529  * It also pins the uniquifier of dropped state owners for
 530  * a while, to ensure that those state owner names are
 531  * never reused.
 532  */
 533 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 534 {
 535         struct nfs_server *server = sp->so_server;
 536         struct nfs_client *clp = server->nfs_client;
 537
 538         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 539                 return;
 540
 541         sp->so_expires = jiffies;
 542         list_add_tail(&sp->so_lru, &server->state_owners_lru);
 543         spin_unlock(&clp->cl_lock);
 544 }
 545
 546 /**
 547  * nfs4_purge_state_owners - Release all cached state owners
 548  * @server: nfs_server with cached state owners to release
 549  *
 550  * Called at umount time.  Remaining state owners will be on
 551  * the LRU with ref count of zero.
 552  */
 553 void nfs4_purge_state_owners(struct nfs_server *server)
 554 {
 555         struct nfs_client *clp = server->nfs_client;
 556         struct nfs4_state_owner *sp, *tmp;
 557         LIST_HEAD(doomed);
 558
 559         spin_lock(&clp->cl_lock);
 560         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 561                 list_move(&sp->so_lru, &doomed);
 562                 nfs4_remove_state_owner_locked(sp);
 563         }
 564         spin_unlock(&clp->cl_lock);
 565
 566         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 567                 list_del(&sp->so_lru);
 568                 nfs4_free_state_owner(sp);
 569         }
 570 }
 571
 572 static struct nfs4_state *
 573 nfs4_alloc_open_state(void)
 574 {
 575         struct nfs4_state *state;
 576
 577         state = kzalloc(sizeof(*state), GFP_NOFS);
 578         if (!state)
 579                 return NULL;
 580         atomic_set(&state->count, 1);
 581         INIT_LIST_HEAD(&state->lock_states);
 582         spin_lock_init(&state->state_lock);
 583         seqlock_init(&state->seqlock);
 584         return state;
 585 }
 586
 587 void
 588 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 589 {
 590         if (state->state == fmode)
 591                 return;
 592         /* NB! List reordering - see the reclaim code for why.  */
 593         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 594                 if (fmode & FMODE_WRITE)
 595                         list_move(&state->open_states, &state->owner->so_states);
 596                 else
 597                         list_move_tail(&state->open_states, &state->owner->so_states);
 598         }
 599         state->state = fmode;
 600 }
 601
 602 static struct nfs4_state *
 603 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 604 {
 605         struct nfs_inode *nfsi = NFS_I(inode);
 606         struct nfs4_state *state;
 607
 608         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 609                 if (state->owner != owner)
 610                         continue;
 611                 if (atomic_inc_not_zero(&state->count))
 612                         return state;
 613         }
 614         return NULL;
 615 }
 616
 617 static void
 618 nfs4_free_open_state(struct nfs4_state *state)
 619 {
 620         kfree(state);
 621 }
 622
 623 struct nfs4_state *
 624 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 625 {
 626         struct nfs4_state *state, *new;
 627         struct nfs_inode *nfsi = NFS_I(inode);
 628
 629         spin_lock(&inode->i_lock);
 630         state = __nfs4_find_state_byowner(inode, owner);
 631         spin_unlock(&inode->i_lock);
 632         if (state)
 633                 goto out;
 634         new = nfs4_alloc_open_state();
 635         spin_lock(&owner->so_lock);
 636         spin_lock(&inode->i_lock);
 637         state = __nfs4_find_state_byowner(inode, owner);
 638         if (state == NULL && new != NULL) {
 639                 state = new;
 640                 state->owner = owner;
 641                 atomic_inc(&owner->so_count);
 642                 list_add(&state->inode_states, &nfsi->open_states);
 643                 ihold(inode);
 644                 state->inode = inode;
 645                 spin_unlock(&inode->i_lock);
 646                 /* Note: The reclaim code dictates that we add stateless
 647                  * and read-only stateids to the end of the list */
 648                 list_add_tail(&state->open_states, &owner->so_states);
 649                 spin_unlock(&owner->so_lock);
 650         } else {
 651                 spin_unlock(&inode->i_lock);
 652                 spin_unlock(&owner->so_lock);
 653                 if (new)
 654                         nfs4_free_open_state(new);
 655         }
 656 out:
 657         return state;
 658 }
 659
 660 void nfs4_put_open_state(struct nfs4_state *state)
 661 {
 662         struct inode *inode = state->inode;
 663         struct nfs4_state_owner *owner = state->owner;
 664
 665         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 666                 return;
 667         spin_lock(&inode->i_lock);
 668         list_del(&state->inode_states);
 669         list_del(&state->open_states);
 670         spin_unlock(&inode->i_lock);
 671         spin_unlock(&owner->so_lock);
 672         iput(inode);
 673         nfs4_free_open_state(state);
 674         nfs4_put_state_owner(owner);
 675 }
 676
 677 /*
 678  * Close the current file.
 679  */
 680 static void __nfs4_close(struct nfs4_state *state,
 681                 fmode_t fmode, gfp_t gfp_mask, int wait)
 682 {
 683         struct nfs4_state_owner *owner = state->owner;
 684         int call_close = 0;
 685         fmode_t newstate;
 686
 687         atomic_inc(&owner->so_count);
 688         /* Protect against nfs4_find_state() */
 689         spin_lock(&owner->so_lock);
 690         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 691                 case FMODE_READ:
 692                         state->n_rdonly--;
 693                         break;
 694                 case FMODE_WRITE:
 695                         state->n_wronly--;
 696                         break;
 697                 case FMODE_READ|FMODE_WRITE:
 698                         state->n_rdwr--;
 699         }
 700         newstate = FMODE_READ|FMODE_WRITE;
 701         if (state->n_rdwr == 0) {
 702                 if (state->n_rdonly == 0) {
 703                         newstate &= ~FMODE_READ;
 704                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 705                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 706                 }
 707                 if (state->n_wronly == 0) {
 708                         newstate &= ~FMODE_WRITE;
 709                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 710                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 711                 }
 712                 if (newstate == 0)
 713                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 714         }
 715         nfs4_state_set_mode_locked(state, newstate);
 716         spin_unlock(&owner->so_lock);
 717
 718         if (!call_close) {
 719                 nfs4_put_open_state(state);
 720                 nfs4_put_state_owner(owner);
 721         } else {
 722                 bool roc = pnfs_roc(state->inode);
 723
 724                 nfs4_do_close(state, gfp_mask, wait, roc);
 725         }
 726 }
 727
 728 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
 729 {
 730         __nfs4_close(state, fmode, GFP_NOFS, 0);
 731 }
 732
 733 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
 734 {
 735         __nfs4_close(state, fmode, GFP_KERNEL, 1);
 736 }
 737
 738 /*
 739  * Search the state->lock_states for an existing lock_owner
 740  * that is compatible with current->files
 741  */
 742 static struct nfs4_lock_state *
 743 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 744 {
 745         struct nfs4_lock_state *pos;
 746         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 747                 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
 748                         continue;
 749                 switch (pos->ls_owner.lo_type) {
 750                 case NFS4_POSIX_LOCK_TYPE:
 751                         if (pos->ls_owner.lo_u.posix_owner != fl_owner)
 752                                 continue;
 753                         break;
 754                 case NFS4_FLOCK_LOCK_TYPE:
 755                         if (pos->ls_owner.lo_u.flock_owner != fl_pid)
 756                                 continue;
 757                 }
 758                 atomic_inc(&pos->ls_count);
 759                 return pos;
 760         }
 761         return NULL;
 762 }
 763
 764 /*
 765  * Return a compatible lock_state. If no initialized lock_state structure
 766  * exists, return an uninitialized one.
 767  *
 768  */
 769 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)
 770 {
 771         struct nfs4_lock_state *lsp;
 772         struct nfs_server *server = state->owner->so_server;
 773
 774         lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
 775         if (lsp == NULL)
 776                 return NULL;
 777         nfs4_init_seqid_counter(&lsp->ls_seqid);
 778         atomic_set(&lsp->ls_count, 1);
 779         lsp->ls_state = state;
 780         lsp->ls_owner.lo_type = type;
 781         switch (lsp->ls_owner.lo_type) {
 782         case NFS4_FLOCK_LOCK_TYPE:
 783                 lsp->ls_owner.lo_u.flock_owner = fl_pid;
 784                 break;
 785         case NFS4_POSIX_LOCK_TYPE:
 786                 lsp->ls_owner.lo_u.posix_owner = fl_owner;
 787                 break;
 788         default:
 789                 goto out_free;
 790         }
 791         lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
 792         if (lsp->ls_seqid.owner_id < 0)
 793                 goto out_free;
 794         INIT_LIST_HEAD(&lsp->ls_locks);
 795         return lsp;
 796 out_free:
 797         kfree(lsp);
 798         return NULL;
 799 }
 800
 801 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
 802 {
 803         ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
 804         nfs4_destroy_seqid_counter(&lsp->ls_seqid);
 805         kfree(lsp);
 806 }
 807
 808 /*
 809  * Return a compatible lock_state. If no initialized lock_state structure
 810  * exists, return an uninitialized one.
 811  *
 812  */
 813 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
 814 {
 815         struct nfs4_lock_state *lsp, *new = NULL;
 816
 817         for(;;) {
 818                 spin_lock(&state->state_lock);
 819                 lsp = __nfs4_find_lock_state(state, owner, pid, type);
 820                 if (lsp != NULL)
 821                         break;
 822                 if (new != NULL) {
 823                         list_add(&new->ls_locks, &state->lock_states);
 824                         set_bit(LK_STATE_IN_USE, &state->flags);
 825                         lsp = new;
 826                         new = NULL;
 827                         break;
 828                 }
 829                 spin_unlock(&state->state_lock);
 830                 new = nfs4_alloc_lock_state(state, owner, pid, type);
 831                 if (new == NULL)
 832                         return NULL;
 833         }
 834         spin_unlock(&state->state_lock);
 835         if (new != NULL)
 836                 nfs4_free_lock_state(state->owner->so_server, new);
 837         return lsp;
 838 }
 839
 840 /*
 841  * Release reference to lock_state, and free it if we see that
 842  * it is no longer in use
 843  */
 844 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 845 {
 846         struct nfs4_state *state;
 847
 848         if (lsp == NULL)
 849                 return;
 850         state = lsp->ls_state;
 851         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 852                 return;
 853         list_del(&lsp->ls_locks);
 854         if (list_empty(&state->lock_states))
 855                 clear_bit(LK_STATE_IN_USE, &state->flags);
 856         spin_unlock(&state->state_lock);
 857         if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
 858                 if (nfs4_release_lockowner(lsp) == 0)
 859                         return;
 860         }
 861         nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp);
 862 }
 863
 864 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 865 {
 866         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 867
 868         dst->fl_u.nfs4_fl.owner = lsp;
 869         atomic_inc(&lsp->ls_count);
 870 }
 871
 872 static void nfs4_fl_release_lock(struct file_lock *fl)
 873 {
 874         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 875 }
 876
 877 static const struct file_lock_operations nfs4_fl_lock_ops = {
 878         .fl_copy_lock = nfs4_fl_copy_lock,
 879         .fl_release_private = nfs4_fl_release_lock,
 880 };
 881
 882 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 883 {
 884         struct nfs4_lock_state *lsp;
 885
 886         if (fl->fl_ops != NULL)
 887                 return 0;
 888         if (fl->fl_flags & FL_POSIX)
 889                 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
 890         else if (fl->fl_flags & FL_FLOCK)
 891                 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
 892                                 NFS4_FLOCK_LOCK_TYPE);
 893         else
 894                 return -EINVAL;
 895         if (lsp == NULL)
 896                 return -ENOMEM;
 897         fl->fl_u.nfs4_fl.owner = lsp;
 898         fl->fl_ops = &nfs4_fl_lock_ops;
 899         return 0;
 900 }
 901
 902 static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
 903                 fl_owner_t fl_owner, pid_t fl_pid)
 904 {
 905         struct nfs4_lock_state *lsp;
 906         bool ret = false;
 907
 908         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 909                 goto out;
 910
 911         spin_lock(&state->state_lock);
 912         lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
 913         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
 914                 nfs4_stateid_copy(dst, &lsp->ls_stateid);
 915                 ret = true;
 916         }
 917         spin_unlock(&state->state_lock);
 918         nfs4_put_lock_state(lsp);
 919 out:
 920         return ret;
 921 }
 922
 923 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
 924 {
 925         int seq;
 926
 927         do {
 928                 seq = read_seqbegin(&state->seqlock);
 929                 nfs4_stateid_copy(dst, &state->stateid);
 930         } while (read_seqretry(&state->seqlock, seq));
 931 }
 932
 933 /*
 934  * Byte-range lock aware utility to initialize the stateid of read/write
 935  * requests.
 936  */
 937 void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
 938                 fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
 939 {
 940         if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
 941                 return;
 942         if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
 943                 return;
 944         nfs4_copy_open_stateid(dst, state);
 945 }
 946
 947 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
 948 {
 949         struct nfs_seqid *new;
 950
 951         new = kmalloc(sizeof(*new), gfp_mask);
 952         if (new != NULL) {
 953                 new->sequence = counter;
 954                 INIT_LIST_HEAD(&new->list);
 955                 new->task = NULL;
 956         }
 957         return new;
 958 }
 959
 960 void nfs_release_seqid(struct nfs_seqid *seqid)
 961 {
 962         struct nfs_seqid_counter *sequence;
 963
 964         if (list_empty(&seqid->list))
 965                 return;
 966         sequence = seqid->sequence;
 967         spin_lock(&sequence->lock);
 968         list_del_init(&seqid->list);
 969         if (!list_empty(&sequence->list)) {
 970                 struct nfs_seqid *next;
 971
 972                 next = list_first_entry(&sequence->list,
 973                                 struct nfs_seqid, list);
 974                 rpc_wake_up_queued_task(&sequence->wait, next->task);
 975         }
 976         spin_unlock(&sequence->lock);
 977 }
 978
 979 void nfs_free_seqid(struct nfs_seqid *seqid)
 980 {
 981         nfs_release_seqid(seqid);
 982         kfree(seqid);
 983 }
 984
 985 /*
 986  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 987  * failed with a seqid incrementing error -
 988  * see comments nfs_fs.h:seqid_mutating_error()
 989  */
 990 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 991 {
 992         BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
 993         switch (status) {
 994                 case 0:
 995                         break;
 996                 case -NFS4ERR_BAD_SEQID:
 997                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 998                                 return;
 999                         pr_warn_ratelimited("NFS: v4 server returned a bad"
1000                                         " sequence-id error on an"
1001                                         " unconfirmed sequence %p!\n",
1002                                         seqid->sequence);
1003                 case -NFS4ERR_STALE_CLIENTID:
1004                 case -NFS4ERR_STALE_STATEID:
1005                 case -NFS4ERR_BAD_STATEID:
1006                 case -NFS4ERR_BADXDR:
1007                 case -NFS4ERR_RESOURCE:
1008                 case -NFS4ERR_NOFILEHANDLE:
1009                         /* Non-seqid mutating errors */
1010                         return;
1011         };
1012         /*
1013          * Note: no locking needed as we are guaranteed to be first
1014          * on the sequence list
1015          */
1016         seqid->sequence->counter++;
1017 }
1018
1019 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1020 {
1021         struct nfs4_state_owner *sp = container_of(seqid->sequence,
1022                                         struct nfs4_state_owner, so_seqid);
1023         struct nfs_server *server = sp->so_server;
1024
1025         if (status == -NFS4ERR_BAD_SEQID)
1026                 nfs4_drop_state_owner(sp);
1027         if (!nfs4_has_session(server->nfs_client))
1028                 nfs_increment_seqid(status, seqid);
1029 }
1030
1031 /*
1032  * Increment the seqid if the LOCK/LOCKU succeeded, or
1033  * failed with a seqid incrementing error -
1034  * see comments nfs_fs.h:seqid_mutating_error()
1035  */
1036 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1037 {
1038         nfs_increment_seqid(status, seqid);
1039 }
1040
1041 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1042 {
1043         struct nfs_seqid_counter *sequence = seqid->sequence;
1044         int status = 0;
1045
1046         spin_lock(&sequence->lock);
1047         seqid->task = task;
1048         if (list_empty(&seqid->list))
1049                 list_add_tail(&seqid->list, &sequence->list);
1050         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1051                 goto unlock;
1052         rpc_sleep_on(&sequence->wait, task, NULL);
1053         status = -EAGAIN;
1054 unlock:
1055         spin_unlock(&sequence->lock);
1056         return status;
1057 }
1058
1059 static int nfs4_run_state_manager(void *);
1060
1061 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1062 {
1063         smp_mb__before_clear_bit();
1064         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1065         smp_mb__after_clear_bit();
1066         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1067         rpc_wake_up(&clp->cl_rpcwaitq);
1068 }
1069
1070 /*
1071  * Schedule the nfs_client asynchronous state management routine
1072  */
1073 void nfs4_schedule_state_manager(struct nfs_client *clp)
1074 {
1075         struct task_struct *task;
1076         char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1077
1078         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1079                 return;
1080         __module_get(THIS_MODULE);
1081         atomic_inc(&clp->cl_count);
1082
1083         /* The rcu_read_lock() is not strictly necessary, as the state
1084          * manager is the only thread that ever changes the rpc_xprt
1085          * after it's initialized.  At this point, we're single threaded. */
1086         rcu_read_lock();
1087         snprintf(buf, sizeof(buf), "%s-manager",
1088                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1089         rcu_read_unlock();
1090         task = kthread_run(nfs4_run_state_manager, clp, buf);
1091         if (IS_ERR(task)) {
1092                 printk(KERN_ERR "%s: kthread_run: %ld\n",
1093                         __func__, PTR_ERR(task));
1094                 nfs4_clear_state_manager_bit(clp);
1095                 nfs_put_client(clp);
1096                 module_put(THIS_MODULE);
1097         }
1098 }
1099
1100 /*
1101  * Schedule a lease recovery attempt
1102  */
1103 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1104 {
1105         if (!clp)
1106                 return;
1107         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1108                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1109         nfs4_schedule_state_manager(clp);
1110 }
1111 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1112
1113 /*
1114  * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1115  * @clp: client to process
1116  *
1117  * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1118  * resend of the SETCLIENTID and hence re-establish the
1119  * callback channel. Then return all existing delegations.
1120  */
1121 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1122 {
1123         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1124         nfs_expire_all_delegations(clp);
1125 }
1126
1127 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1128 {
1129         nfs40_handle_cb_pathdown(clp);
1130         nfs4_schedule_state_manager(clp);
1131 }
1132
1133 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1134 {
1135
1136         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1137         /* Don't recover state that expired before the reboot */
1138         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1139                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1140                 return 0;
1141         }
1142         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1143         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1144         return 1;
1145 }
1146
1147 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1148 {
1149         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1150         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1151         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1152         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1153         return 1;
1154 }
1155
1156 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1157 {
1158         struct nfs_client *clp = server->nfs_client;
1159
1160         nfs4_state_mark_reclaim_nograce(clp, state);
1161         nfs4_schedule_state_manager(clp);
1162 }
1163 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1164
1165 void nfs_inode_find_state_and_recover(struct inode *inode,
1166                 const nfs4_stateid *stateid)
1167 {
1168         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1169         struct nfs_inode *nfsi = NFS_I(inode);
1170         struct nfs_open_context *ctx;
1171         struct nfs4_state *state;
1172         bool found = false;
1173
1174         spin_lock(&inode->i_lock);
1175         list_for_each_entry(ctx, &nfsi->open_files, list) {
1176                 state = ctx->state;
1177                 if (state == NULL)
1178                         continue;
1179                 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1180                         continue;
1181                 if (!nfs4_stateid_match(&state->stateid, stateid))
1182                         continue;
1183                 nfs4_state_mark_reclaim_nograce(clp, state);
1184                 found = true;
1185         }
1186         spin_unlock(&inode->i_lock);
1187         if (found)
1188                 nfs4_schedule_state_manager(clp);
1189 }
1190
1191
1192 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1193 {
1194         struct inode *inode = state->inode;
1195         struct nfs_inode *nfsi = NFS_I(inode);
1196         struct file_lock *fl;
1197         int status = 0;
1198
1199         if (inode->i_flock == NULL)
1200                 return 0;
1201
1202         /* Guard against delegation returns and new lock/unlock calls */
1203         down_write(&nfsi->rwsem);
1204         /* Protect inode->i_flock using the BKL */
1205         lock_flocks();
1206         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1207                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1208                         continue;
1209                 if (nfs_file_open_context(fl->fl_file)->state != state)
1210                         continue;
1211                 unlock_flocks();
1212                 status = ops->recover_lock(state, fl);
1213                 switch (status) {
1214                         case 0:
1215                                 break;
1216                         case -ESTALE:
1217                         case -NFS4ERR_ADMIN_REVOKED:
1218                         case -NFS4ERR_STALE_STATEID:
1219                         case -NFS4ERR_BAD_STATEID:
1220                         case -NFS4ERR_EXPIRED:
1221                         case -NFS4ERR_NO_GRACE:
1222                         case -NFS4ERR_STALE_CLIENTID:
1223                         case -NFS4ERR_BADSESSION:
1224                         case -NFS4ERR_BADSLOT:
1225                         case -NFS4ERR_BAD_HIGH_SLOT:
1226                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1227                                 goto out;
1228                         default:
1229                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1230                                         "Zeroing state\n", __func__, status);
1231                         case -ENOMEM:
1232                         case -NFS4ERR_DENIED:
1233                         case -NFS4ERR_RECLAIM_BAD:
1234                         case -NFS4ERR_RECLAIM_CONFLICT:
1235                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1236                                 status = 0;
1237                 }
1238                 lock_flocks();
1239         }
1240         unlock_flocks();
1241 out:
1242         up_write(&nfsi->rwsem);
1243         return status;
1244 }
1245
1246 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1247 {
1248         struct nfs4_state *state;
1249         struct nfs4_lock_state *lock;
1250         int status = 0;
1251
1252         /* Note: we rely on the sp->so_states list being ordered
1253          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1254          * states first.
1255          * This is needed to ensure that the server won't give us any
1256          * read delegations that we have to return if, say, we are
1257          * recovering after a network partition or a reboot from a
1258          * server that doesn't support a grace period.
1259          */
1260 restart:
1261         spin_lock(&sp->so_lock);
1262         list_for_each_entry(state, &sp->so_states, open_states) {
1263                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1264                         continue;
1265                 if (state->state == 0)
1266                         continue;
1267                 atomic_inc(&state->count);
1268                 spin_unlock(&sp->so_lock);
1269                 status = ops->recover_open(sp, state);
1270                 if (status >= 0) {
1271                         status = nfs4_reclaim_locks(state, ops);
1272                         if (status >= 0) {
1273                                 spin_lock(&state->state_lock);
1274                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1275                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1276                                                 pr_warn_ratelimited("NFS: "
1277                                                         "%s: Lock reclaim "
1278                                                         "failed!\n", __func__);
1279                                 }
1280                                 spin_unlock(&state->state_lock);
1281                                 nfs4_put_open_state(state);
1282                                 goto restart;
1283                         }
1284                 }
1285                 switch (status) {
1286                         default:
1287                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1288                                         "Zeroing state\n", __func__, status);
1289                         case -ENOENT:
1290                         case -ENOMEM:
1291                         case -ESTALE:
1292                                 /*
1293                                  * Open state on this file cannot be recovered
1294                                  * All we can do is revert to using the zero stateid.
1295                                  */
1296                                 memset(&state->stateid, 0,
1297                                         sizeof(state->stateid));
1298                                 /* Mark the file as being 'closed' */
1299                                 state->state = 0;
1300                                 break;
1301                         case -EKEYEXPIRED:
1302                                 /*
1303                                  * User RPCSEC_GSS context has expired.
1304                                  * We cannot recover this stateid now, so
1305                                  * skip it and allow recovery thread to
1306                                  * proceed.
1307                                  */
1308                                 break;
1309                         case -NFS4ERR_ADMIN_REVOKED:
1310                         case -NFS4ERR_STALE_STATEID:
1311                         case -NFS4ERR_BAD_STATEID:
1312                         case -NFS4ERR_RECLAIM_BAD:
1313                         case -NFS4ERR_RECLAIM_CONFLICT:
1314                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1315                                 break;
1316                         case -NFS4ERR_EXPIRED:
1317                         case -NFS4ERR_NO_GRACE:
1318                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1319                         case -NFS4ERR_STALE_CLIENTID:
1320                         case -NFS4ERR_BADSESSION:
1321                         case -NFS4ERR_BADSLOT:
1322                         case -NFS4ERR_BAD_HIGH_SLOT:
1323                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1324                                 goto out_err;
1325                 }
1326                 nfs4_put_open_state(state);
1327                 goto restart;
1328         }
1329         spin_unlock(&sp->so_lock);
1330         return 0;
1331 out_err:
1332         nfs4_put_open_state(state);
1333         return status;
1334 }
1335
1336 static void nfs4_clear_open_state(struct nfs4_state *state)
1337 {
1338         struct nfs4_lock_state *lock;
1339
1340         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1341         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1342         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1343         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1344         spin_lock(&state->state_lock);
1345         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1346                 lock->ls_seqid.flags = 0;
1347                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1348         }
1349         spin_unlock(&state->state_lock);
1350 }
1351
1352 static void nfs4_reset_seqids(struct nfs_server *server,
1353         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1354 {
1355         struct nfs_client *clp = server->nfs_client;
1356         struct nfs4_state_owner *sp;
1357         struct rb_node *pos;
1358         struct nfs4_state *state;
1359
1360         spin_lock(&clp->cl_lock);
1361         for (pos = rb_first(&server->state_owners);
1362              pos != NULL;
1363              pos = rb_next(pos)) {
1364                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1365                 sp->so_seqid.flags = 0;
1366                 spin_lock(&sp->so_lock);
1367                 list_for_each_entry(state, &sp->so_states, open_states) {
1368                         if (mark_reclaim(clp, state))
1369                                 nfs4_clear_open_state(state);
1370                 }
1371                 spin_unlock(&sp->so_lock);
1372         }
1373         spin_unlock(&clp->cl_lock);
1374 }
1375
1376 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1377         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1378 {
1379         struct nfs_server *server;
1380
1381         rcu_read_lock();
1382         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1383                 nfs4_reset_seqids(server, mark_reclaim);
1384         rcu_read_unlock();
1385 }
1386
1387 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1388 {
1389         /* Mark all delegations for reclaim */
1390         nfs_delegation_mark_reclaim(clp);
1391         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1392 }
1393
1394 static void nfs4_reclaim_complete(struct nfs_client *clp,
1395                                  const struct nfs4_state_recovery_ops *ops)
1396 {
1397         /* Notify the server we're done reclaiming our state */
1398         if (ops->reclaim_complete)
1399                 (void)ops->reclaim_complete(clp);
1400 }
1401
1402 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1403 {
1404         struct nfs_client *clp = server->nfs_client;
1405         struct nfs4_state_owner *sp;
1406         struct rb_node *pos;
1407         struct nfs4_state *state;
1408
1409         spin_lock(&clp->cl_lock);
1410         for (pos = rb_first(&server->state_owners);
1411              pos != NULL;
1412              pos = rb_next(pos)) {
1413                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1414                 spin_lock(&sp->so_lock);
1415                 list_for_each_entry(state, &sp->so_states, open_states) {
1416                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1417                                                 &state->flags))
1418                                 continue;
1419                         nfs4_state_mark_reclaim_nograce(clp, state);
1420                 }
1421                 spin_unlock(&sp->so_lock);
1422         }
1423         spin_unlock(&clp->cl_lock);
1424 }
1425
1426 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1427 {
1428         struct nfs_server *server;
1429
1430         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1431                 return 0;
1432
1433         rcu_read_lock();
1434         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1435                 nfs4_clear_reclaim_server(server);
1436         rcu_read_unlock();
1437
1438         nfs_delegation_reap_unclaimed(clp);
1439         return 1;
1440 }
1441
1442 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1443 {
1444         if (!nfs4_state_clear_reclaim_reboot(clp))
1445                 return;
1446         nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1447 }
1448
1449 static void nfs_delegation_clear_all(struct nfs_client *clp)
1450 {
1451         nfs_delegation_mark_reclaim(clp);
1452         nfs_delegation_reap_unclaimed(clp);
1453 }
1454
1455 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1456 {
1457         nfs_delegation_clear_all(clp);
1458         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1459 }
1460
1461 static void nfs4_warn_keyexpired(const char *s)
1462 {
1463         printk_ratelimited(KERN_WARNING "Error: state manager"
1464                         " encountered RPCSEC_GSS session"
1465                         " expired against NFSv4 server %s.\n",
1466                         s);
1467 }
1468
1469 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1470 {
1471         switch (error) {
1472                 case 0:
1473                         break;
1474                 case -NFS4ERR_CB_PATH_DOWN:
1475                         nfs40_handle_cb_pathdown(clp);
1476                         break;
1477                 case -NFS4ERR_NO_GRACE:
1478                         nfs4_state_end_reclaim_reboot(clp);
1479                         break;
1480                 case -NFS4ERR_STALE_CLIENTID:
1481                 case -NFS4ERR_LEASE_MOVED:
1482                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1483                         nfs4_state_clear_reclaim_reboot(clp);
1484                         nfs4_state_start_reclaim_reboot(clp);
1485                         break;
1486                 case -NFS4ERR_EXPIRED:
1487                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1488                         nfs4_state_start_reclaim_nograce(clp);
1489                         break;
1490                 case -NFS4ERR_BADSESSION:
1491                 case -NFS4ERR_BADSLOT:
1492                 case -NFS4ERR_BAD_HIGH_SLOT:
1493                 case -NFS4ERR_DEADSESSION:
1494                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1495                 case -NFS4ERR_SEQ_FALSE_RETRY:
1496                 case -NFS4ERR_SEQ_MISORDERED:
1497                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1498                         /* Zero session reset errors */
1499                         break;
1500                 case -EKEYEXPIRED:
1501                         /* Nothing we can do */
1502                         nfs4_warn_keyexpired(clp->cl_hostname);
1503                         break;
1504                 default:
1505                         return error;
1506         }
1507         return 0;
1508 }
1509
1510 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1511 {
1512         struct nfs4_state_owner *sp;
1513         struct nfs_server *server;
1514         struct rb_node *pos;
1515         int status = 0;
1516
1517 restart:
1518         rcu_read_lock();
1519         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1520                 nfs4_purge_state_owners(server);
1521                 spin_lock(&clp->cl_lock);
1522                 for (pos = rb_first(&server->state_owners);
1523                      pos != NULL;
1524                      pos = rb_next(pos)) {
1525                         sp = rb_entry(pos,
1526                                 struct nfs4_state_owner, so_server_node);
1527                         if (!test_and_clear_bit(ops->owner_flag_bit,
1528                                                         &sp->so_flags))
1529                                 continue;
1530                         atomic_inc(&sp->so_count);
1531                         spin_unlock(&clp->cl_lock);
1532                         rcu_read_unlock();
1533
1534                         status = nfs4_reclaim_open_state(sp, ops);
1535                         if (status < 0) {
1536                                 set_bit(ops->owner_flag_bit, &sp->so_flags);
1537                                 nfs4_put_state_owner(sp);
1538                                 return nfs4_recovery_handle_error(clp, status);
1539                         }
1540
1541                         nfs4_put_state_owner(sp);
1542                         goto restart;
1543                 }
1544                 spin_unlock(&clp->cl_lock);
1545         }
1546         rcu_read_unlock();
1547         return status;
1548 }
1549
1550 static int nfs4_check_lease(struct nfs_client *clp)
1551 {
1552         struct rpc_cred *cred;
1553         const struct nfs4_state_maintenance_ops *ops =
1554                 clp->cl_mvops->state_renewal_ops;
1555         int status;
1556
1557         /* Is the client already known to have an expired lease? */
1558         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1559                 return 0;
1560         spin_lock(&clp->cl_lock);
1561         cred = ops->get_state_renewal_cred_locked(clp);
1562         spin_unlock(&clp->cl_lock);
1563         if (cred == NULL) {
1564                 cred = nfs4_get_setclientid_cred(clp);
1565                 status = -ENOKEY;
1566                 if (cred == NULL)
1567                         goto out;
1568         }
1569         status = ops->renew_lease(clp, cred);
1570         put_rpccred(cred);
1571 out:
1572         return nfs4_recovery_handle_error(clp, status);
1573 }
1574
1575 static int nfs4_reclaim_lease(struct nfs_client *clp)
1576 {
1577         struct rpc_cred *cred;
1578         const struct nfs4_state_recovery_ops *ops =
1579                 clp->cl_mvops->reboot_recovery_ops;
1580         int status = -ENOENT;
1581
1582         cred = ops->get_clid_cred(clp);
1583         if (cred != NULL) {
1584                 status = ops->establish_clid(clp, cred);
1585                 put_rpccred(cred);
1586                 /* Handle case where the user hasn't set up machine creds */
1587                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1588                         nfs4_clear_machine_cred(clp);
1589                         status = -EAGAIN;
1590                 }
1591                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1592                         status = -EPROTONOSUPPORT;
1593         }
1594         return status;
1595 }
1596
1597 #ifdef CONFIG_NFS_V4_1
1598 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1599 {
1600         struct nfs_client *clp = session->clp;
1601
1602         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1603         nfs4_schedule_lease_recovery(clp);
1604 }
1605 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1606
1607 void nfs41_handle_recall_slot(struct nfs_client *clp)
1608 {
1609         set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1610         nfs4_schedule_state_manager(clp);
1611 }
1612
1613 static void nfs4_reset_all_state(struct nfs_client *clp)
1614 {
1615         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1616                 clp->cl_boot_time = CURRENT_TIME;
1617                 nfs4_state_start_reclaim_nograce(clp);
1618                 nfs4_schedule_state_manager(clp);
1619         }
1620 }
1621
1622 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1623 {
1624         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1625                 nfs4_state_start_reclaim_reboot(clp);
1626                 nfs4_schedule_state_manager(clp);
1627         }
1628 }
1629
1630 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1631 {
1632         /* Temporary */
1633         nfs4_reset_all_state(clp);
1634 }
1635
1636 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1637 {
1638         /* This will need to handle layouts too */
1639         nfs_expire_all_delegations(clp);
1640 }
1641
1642 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1643 {
1644         nfs_expire_all_delegations(clp);
1645         if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1646                 nfs4_schedule_state_manager(clp);
1647 }
1648
1649 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1650 {
1651         if (!flags)
1652                 return;
1653         if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1654                 nfs41_handle_server_reboot(clp);
1655         if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1656                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1657                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1658                             SEQ4_STATUS_LEASE_MOVED))
1659                 nfs41_handle_state_revoked(clp);
1660         if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1661                 nfs41_handle_recallable_state_revoked(clp);
1662         if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1663                             SEQ4_STATUS_BACKCHANNEL_FAULT |
1664                             SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1665                 nfs41_handle_cb_path_down(clp);
1666 }
1667
1668 static int nfs4_reset_session(struct nfs_client *clp)
1669 {
1670         int status;
1671
1672         nfs4_begin_drain_session(clp);
1673         status = nfs4_proc_destroy_session(clp->cl_session);
1674         if (status && status != -NFS4ERR_BADSESSION &&
1675             status != -NFS4ERR_DEADSESSION) {
1676                 status = nfs4_recovery_handle_error(clp, status);
1677                 goto out;
1678         }
1679
1680         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1681         status = nfs4_proc_create_session(clp);
1682         if (status) {
1683                 status = nfs4_recovery_handle_error(clp, status);
1684                 goto out;
1685         }
1686         clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1687         /* create_session negotiated new slot table */
1688         clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1689
1690          /* Let the state manager reestablish state */
1691         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1692                 nfs41_setup_state_renewal(clp);
1693 out:
1694         return status;
1695 }
1696
1697 static int nfs4_recall_slot(struct nfs_client *clp)
1698 {
1699         struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1700         struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1701         struct nfs4_slot *new, *old;
1702         int i;
1703
1704         nfs4_begin_drain_session(clp);
1705         new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1706                       GFP_NOFS);
1707         if (!new)
1708                 return -ENOMEM;
1709
1710         spin_lock(&fc_tbl->slot_tbl_lock);
1711         for (i = 0; i < fc_tbl->target_max_slots; i++)
1712                 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1713         old = fc_tbl->slots;
1714         fc_tbl->slots = new;
1715         fc_tbl->max_slots = fc_tbl->target_max_slots;
1716         fc_tbl->target_max_slots = 0;
1717         fc_attrs->max_reqs = fc_tbl->max_slots;
1718         spin_unlock(&fc_tbl->slot_tbl_lock);
1719
1720         kfree(old);
1721         nfs4_end_drain_session(clp);
1722         return 0;
1723 }
1724
1725 #else /* CONFIG_NFS_V4_1 */
1726 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1727 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1728 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1729 #endif /* CONFIG_NFS_V4_1 */
1730
1731 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1732  * on EXCHANGE_ID for v4.1
1733  */
1734 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1735 {
1736         switch (status) {
1737         case -NFS4ERR_CLID_INUSE:
1738         case -NFS4ERR_STALE_CLIENTID:
1739                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1740                 break;
1741         case -NFS4ERR_DELAY:
1742         case -ETIMEDOUT:
1743         case -EAGAIN:
1744                 ssleep(1);
1745                 break;
1746
1747         case -EKEYEXPIRED:
1748                 nfs4_warn_keyexpired(clp->cl_hostname);
1749         case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1750                                  * in nfs4_exchange_id */
1751         default:
1752                 return;
1753         }
1754         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1755 }
1756
1757 static void nfs4_state_manager(struct nfs_client *clp)
1758 {
1759         int status = 0;
1760
1761         /* Ensure exclusive access to NFSv4 state */
1762         do {
1763                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1764                         /* We're going to have to re-establish a clientid */
1765                         status = nfs4_reclaim_lease(clp);
1766                         if (status) {
1767                                 nfs4_set_lease_expired(clp, status);
1768                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1769                                                         &clp->cl_state))
1770                                         continue;
1771                                 if (clp->cl_cons_state ==
1772                                                         NFS_CS_SESSION_INITING)
1773                                         nfs_mark_client_ready(clp, status);
1774                                 goto out_error;
1775                         }
1776                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1777
1778                         if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1779                                                &clp->cl_state))
1780                                 nfs4_state_start_reclaim_nograce(clp);
1781                         else
1782                                 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1783                                         &clp->cl_state);
1784
1785                         pnfs_destroy_all_layouts(clp);
1786                 }
1787
1788                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1789                         status = nfs4_check_lease(clp);
1790                         if (status < 0)
1791                                 goto out_error;
1792                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1793                                 continue;
1794                 }
1795
1796                 /* Initialize or reset the session */
1797                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1798                    && nfs4_has_session(clp)) {
1799                         status = nfs4_reset_session(clp);
1800                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1801                                 continue;
1802                         if (status < 0)
1803                                 goto out_error;
1804                 }
1805
1806                 /* First recover reboot state... */
1807                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1808                         status = nfs4_do_reclaim(clp,
1809                                 clp->cl_mvops->reboot_recovery_ops);
1810                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1811                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1812                                 continue;
1813                         nfs4_state_end_reclaim_reboot(clp);
1814                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1815                                 continue;
1816                         if (status < 0)
1817                                 goto out_error;
1818                 }
1819
1820                 /* Now recover expired state... */
1821                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1822                         status = nfs4_do_reclaim(clp,
1823                                 clp->cl_mvops->nograce_recovery_ops);
1824                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1825                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1826                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1827                                 continue;
1828                         if (status < 0)
1829                                 goto out_error;
1830                 }
1831
1832                 nfs4_end_drain_session(clp);
1833                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1834                         nfs_client_return_marked_delegations(clp);
1835                         continue;
1836                 }
1837                 /* Recall session slots */
1838                 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1839                    && nfs4_has_session(clp)) {
1840                         status = nfs4_recall_slot(clp);
1841                         if (status < 0)
1842                                 goto out_error;
1843                         continue;
1844                 }
1845
1846
1847                 nfs4_clear_state_manager_bit(clp);
1848                 /* Did we race with an attempt to give us more work? */
1849                 if (clp->cl_state == 0)
1850                         break;
1851                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1852                         break;
1853         } while (atomic_read(&clp->cl_count) > 1);
1854         return;
1855 out_error:
1856         pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s"
1857                         " with error %d\n", clp->cl_hostname, -status);
1858         nfs4_end_drain_session(clp);
1859         nfs4_clear_state_manager_bit(clp);
1860 }
1861
1862 static int nfs4_run_state_manager(void *ptr)
1863 {
1864         struct nfs_client *clp = ptr;
1865
1866         allow_signal(SIGKILL);
1867         nfs4_state_manager(clp);
1868         nfs_put_client(clp);
1869         module_put_and_exit(0);
1870         return 0;
1871 }
1872
1873 /*
1874  * Local variables:
1875  *  c-basic-offset: 8
1876  * End:
1877  */