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