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/smp_lock.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/workqueue.h>
  50 #include <linux/bitops.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "callback.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56
  57 #define OPENOWNER_POOL_SIZE     8
  58
  59 const nfs4_stateid zero_stateid;
  60
  61 static LIST_HEAD(nfs4_clientid_list);
  62
  63 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
  64 {
  65         unsigned short port;
  66         int status;
  67
  68         port = nfs_callback_tcpport;
  69         if (clp->cl_addr.ss_family == AF_INET6)
  70                 port = nfs_callback_tcpport6;
  71
  72         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred);
  73         if (status == 0)
  74                 status = nfs4_proc_setclientid_confirm(clp, cred);
  75         if (status == 0)
  76                 nfs4_schedule_state_renewal(clp);
  77         return status;
  78 }
  79
  80 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
  81 {
  82         struct rpc_cred *cred = NULL;
  83
  84         if (clp->cl_machine_cred != NULL)
  85                 cred = get_rpccred(clp->cl_machine_cred);
  86         return cred;
  87 }
  88
  89 static void nfs4_clear_machine_cred(struct nfs_client *clp)
  90 {
  91         struct rpc_cred *cred;
  92
  93         spin_lock(&clp->cl_lock);
  94         cred = clp->cl_machine_cred;
  95         clp->cl_machine_cred = NULL;
  96         spin_unlock(&clp->cl_lock);
  97         if (cred != NULL)
  98                 put_rpccred(cred);
  99 }
 100
 101 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 102 {
 103         struct nfs4_state_owner *sp;
 104         struct rb_node *pos;
 105         struct rpc_cred *cred = NULL;
 106
 107         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
 108                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 109                 if (list_empty(&sp->so_states))
 110                         continue;
 111                 cred = get_rpccred(sp->so_cred);
 112                 break;
 113         }
 114         return cred;
 115 }
 116
 117 #if defined(CONFIG_NFS_V4_1)
 118
 119 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 120 {
 121         struct rpc_cred *cred;
 122
 123         spin_lock(&clp->cl_lock);
 124         cred = nfs4_get_machine_cred_locked(clp);
 125         spin_unlock(&clp->cl_lock);
 126         return cred;
 127 }
 128
 129 #endif /* CONFIG_NFS_V4_1 */
 130
 131 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 132 {
 133         struct nfs4_state_owner *sp;
 134         struct rb_node *pos;
 135         struct rpc_cred *cred;
 136
 137         spin_lock(&clp->cl_lock);
 138         cred = nfs4_get_machine_cred_locked(clp);
 139         if (cred != NULL)
 140                 goto out;
 141         pos = rb_first(&clp->cl_state_owners);
 142         if (pos != NULL) {
 143                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 144                 cred = get_rpccred(sp->so_cred);
 145         }
 146 out:
 147         spin_unlock(&clp->cl_lock);
 148         return cred;
 149 }
 150
 151 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
 152                 __u64 minval, int maxbits)
 153 {
 154         struct rb_node **p, *parent;
 155         struct nfs_unique_id *pos;
 156         __u64 mask = ~0ULL;
 157
 158         if (maxbits < 64)
 159                 mask = (1ULL << maxbits) - 1ULL;
 160
 161         /* Ensure distribution is more or less flat */
 162         get_random_bytes(&new->id, sizeof(new->id));
 163         new->id &= mask;
 164         if (new->id < minval)
 165                 new->id += minval;
 166 retry:
 167         p = &root->rb_node;
 168         parent = NULL;
 169
 170         while (*p != NULL) {
 171                 parent = *p;
 172                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 173
 174                 if (new->id < pos->id)
 175                         p = &(*p)->rb_left;
 176                 else if (new->id > pos->id)
 177                         p = &(*p)->rb_right;
 178                 else
 179                         goto id_exists;
 180         }
 181         rb_link_node(&new->rb_node, parent, p);
 182         rb_insert_color(&new->rb_node, root);
 183         return;
 184 id_exists:
 185         for (;;) {
 186                 new->id++;
 187                 if (new->id < minval || (new->id & mask) != new->id) {
 188                         new->id = minval;
 189                         break;
 190                 }
 191                 parent = rb_next(parent);
 192                 if (parent == NULL)
 193                         break;
 194                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 195                 if (new->id < pos->id)
 196                         break;
 197         }
 198         goto retry;
 199 }
 200
 201 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 202 {
 203         rb_erase(&id->rb_node, root);
 204 }
 205
 206 static struct nfs4_state_owner *
 207 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 208 {
 209         struct nfs_client *clp = server->nfs_client;
 210         struct rb_node **p = &clp->cl_state_owners.rb_node,
 211                        *parent = NULL;
 212         struct nfs4_state_owner *sp, *res = NULL;
 213
 214         while (*p != NULL) {
 215                 parent = *p;
 216                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 217
 218                 if (server < sp->so_server) {
 219                         p = &parent->rb_left;
 220                         continue;
 221                 }
 222                 if (server > sp->so_server) {
 223                         p = &parent->rb_right;
 224                         continue;
 225                 }
 226                 if (cred < sp->so_cred)
 227                         p = &parent->rb_left;
 228                 else if (cred > sp->so_cred)
 229                         p = &parent->rb_right;
 230                 else {
 231                         atomic_inc(&sp->so_count);
 232                         res = sp;
 233                         break;
 234                 }
 235         }
 236         return res;
 237 }
 238
 239 static struct nfs4_state_owner *
 240 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
 241 {
 242         struct rb_node **p = &clp->cl_state_owners.rb_node,
 243                        *parent = NULL;
 244         struct nfs4_state_owner *sp;
 245
 246         while (*p != NULL) {
 247                 parent = *p;
 248                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 249
 250                 if (new->so_server < sp->so_server) {
 251                         p = &parent->rb_left;
 252                         continue;
 253                 }
 254                 if (new->so_server > sp->so_server) {
 255                         p = &parent->rb_right;
 256                         continue;
 257                 }
 258                 if (new->so_cred < sp->so_cred)
 259                         p = &parent->rb_left;
 260                 else if (new->so_cred > sp->so_cred)
 261                         p = &parent->rb_right;
 262                 else {
 263                         atomic_inc(&sp->so_count);
 264                         return sp;
 265                 }
 266         }
 267         nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
 268         rb_link_node(&new->so_client_node, parent, p);
 269         rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
 270         return new;
 271 }
 272
 273 static void
 274 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
 275 {
 276         if (!RB_EMPTY_NODE(&sp->so_client_node))
 277                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 278         nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
 279 }
 280
 281 /*
 282  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 283  * create a new state_owner.
 284  *
 285  */
 286 static struct nfs4_state_owner *
 287 nfs4_alloc_state_owner(void)
 288 {
 289         struct nfs4_state_owner *sp;
 290
 291         sp = kzalloc(sizeof(*sp),GFP_KERNEL);
 292         if (!sp)
 293                 return NULL;
 294         spin_lock_init(&sp->so_lock);
 295         INIT_LIST_HEAD(&sp->so_states);
 296         INIT_LIST_HEAD(&sp->so_delegations);
 297         rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
 298         sp->so_seqid.sequence = &sp->so_sequence;
 299         spin_lock_init(&sp->so_sequence.lock);
 300         INIT_LIST_HEAD(&sp->so_sequence.list);
 301         atomic_set(&sp->so_count, 1);
 302         return sp;
 303 }
 304
 305 static void
 306 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 307 {
 308         if (!RB_EMPTY_NODE(&sp->so_client_node)) {
 309                 struct nfs_client *clp = sp->so_client;
 310
 311                 spin_lock(&clp->cl_lock);
 312                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 313                 RB_CLEAR_NODE(&sp->so_client_node);
 314                 spin_unlock(&clp->cl_lock);
 315         }
 316 }
 317
 318 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 319 {
 320         struct nfs_client *clp = server->nfs_client;
 321         struct nfs4_state_owner *sp, *new;
 322
 323         spin_lock(&clp->cl_lock);
 324         sp = nfs4_find_state_owner(server, cred);
 325         spin_unlock(&clp->cl_lock);
 326         if (sp != NULL)
 327                 return sp;
 328         new = nfs4_alloc_state_owner();
 329         if (new == NULL)
 330                 return NULL;
 331         new->so_client = clp;
 332         new->so_server = server;
 333         new->so_cred = cred;
 334         spin_lock(&clp->cl_lock);
 335         sp = nfs4_insert_state_owner(clp, new);
 336         spin_unlock(&clp->cl_lock);
 337         if (sp == new)
 338                 get_rpccred(cred);
 339         else {
 340                 rpc_destroy_wait_queue(&new->so_sequence.wait);
 341                 kfree(new);
 342         }
 343         return sp;
 344 }
 345
 346 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 347 {
 348         struct nfs_client *clp = sp->so_client;
 349         struct rpc_cred *cred = sp->so_cred;
 350
 351         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 352                 return;
 353         nfs4_remove_state_owner(clp, sp);
 354         spin_unlock(&clp->cl_lock);
 355         rpc_destroy_wait_queue(&sp->so_sequence.wait);
 356         put_rpccred(cred);
 357         kfree(sp);
 358 }
 359
 360 static struct nfs4_state *
 361 nfs4_alloc_open_state(void)
 362 {
 363         struct nfs4_state *state;
 364
 365         state = kzalloc(sizeof(*state), GFP_KERNEL);
 366         if (!state)
 367                 return NULL;
 368         atomic_set(&state->count, 1);
 369         INIT_LIST_HEAD(&state->lock_states);
 370         spin_lock_init(&state->state_lock);
 371         seqlock_init(&state->seqlock);
 372         return state;
 373 }
 374
 375 void
 376 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 377 {
 378         if (state->state == fmode)
 379                 return;
 380         /* NB! List reordering - see the reclaim code for why.  */
 381         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 382                 if (fmode & FMODE_WRITE)
 383                         list_move(&state->open_states, &state->owner->so_states);
 384                 else
 385                         list_move_tail(&state->open_states, &state->owner->so_states);
 386         }
 387         state->state = fmode;
 388 }
 389
 390 static struct nfs4_state *
 391 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 392 {
 393         struct nfs_inode *nfsi = NFS_I(inode);
 394         struct nfs4_state *state;
 395
 396         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 397                 if (state->owner != owner)
 398                         continue;
 399                 if (atomic_inc_not_zero(&state->count))
 400                         return state;
 401         }
 402         return NULL;
 403 }
 404
 405 static void
 406 nfs4_free_open_state(struct nfs4_state *state)
 407 {
 408         kfree(state);
 409 }
 410
 411 struct nfs4_state *
 412 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 413 {
 414         struct nfs4_state *state, *new;
 415         struct nfs_inode *nfsi = NFS_I(inode);
 416
 417         spin_lock(&inode->i_lock);
 418         state = __nfs4_find_state_byowner(inode, owner);
 419         spin_unlock(&inode->i_lock);
 420         if (state)
 421                 goto out;
 422         new = nfs4_alloc_open_state();
 423         spin_lock(&owner->so_lock);
 424         spin_lock(&inode->i_lock);
 425         state = __nfs4_find_state_byowner(inode, owner);
 426         if (state == NULL && new != NULL) {
 427                 state = new;
 428                 state->owner = owner;
 429                 atomic_inc(&owner->so_count);
 430                 list_add(&state->inode_states, &nfsi->open_states);
 431                 state->inode = igrab(inode);
 432                 spin_unlock(&inode->i_lock);
 433                 /* Note: The reclaim code dictates that we add stateless
 434                  * and read-only stateids to the end of the list */
 435                 list_add_tail(&state->open_states, &owner->so_states);
 436                 spin_unlock(&owner->so_lock);
 437         } else {
 438                 spin_unlock(&inode->i_lock);
 439                 spin_unlock(&owner->so_lock);
 440                 if (new)
 441                         nfs4_free_open_state(new);
 442         }
 443 out:
 444         return state;
 445 }
 446
 447 void nfs4_put_open_state(struct nfs4_state *state)
 448 {
 449         struct inode *inode = state->inode;
 450         struct nfs4_state_owner *owner = state->owner;
 451
 452         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 453                 return;
 454         spin_lock(&inode->i_lock);
 455         list_del(&state->inode_states);
 456         list_del(&state->open_states);
 457         spin_unlock(&inode->i_lock);
 458         spin_unlock(&owner->so_lock);
 459         iput(inode);
 460         nfs4_free_open_state(state);
 461         nfs4_put_state_owner(owner);
 462 }
 463
 464 /*
 465  * Close the current file.
 466  */
 467 static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
 468 {
 469         struct nfs4_state_owner *owner = state->owner;
 470         int call_close = 0;
 471         fmode_t newstate;
 472
 473         atomic_inc(&owner->so_count);
 474         /* Protect against nfs4_find_state() */
 475         spin_lock(&owner->so_lock);
 476         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 477                 case FMODE_READ:
 478                         state->n_rdonly--;
 479                         break;
 480                 case FMODE_WRITE:
 481                         state->n_wronly--;
 482                         break;
 483                 case FMODE_READ|FMODE_WRITE:
 484                         state->n_rdwr--;
 485         }
 486         newstate = FMODE_READ|FMODE_WRITE;
 487         if (state->n_rdwr == 0) {
 488                 if (state->n_rdonly == 0) {
 489                         newstate &= ~FMODE_READ;
 490                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 491                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 492                 }
 493                 if (state->n_wronly == 0) {
 494                         newstate &= ~FMODE_WRITE;
 495                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 496                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 497                 }
 498                 if (newstate == 0)
 499                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 500         }
 501         nfs4_state_set_mode_locked(state, newstate);
 502         spin_unlock(&owner->so_lock);
 503
 504         if (!call_close) {
 505                 nfs4_put_open_state(state);
 506                 nfs4_put_state_owner(owner);
 507         } else
 508                 nfs4_do_close(path, state, wait);
 509 }
 510
 511 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
 512 {
 513         __nfs4_close(path, state, fmode, 0);
 514 }
 515
 516 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
 517 {
 518         __nfs4_close(path, state, fmode, 1);
 519 }
 520
 521 /*
 522  * Search the state->lock_states for an existing lock_owner
 523  * that is compatible with current->files
 524  */
 525 static struct nfs4_lock_state *
 526 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 527 {
 528         struct nfs4_lock_state *pos;
 529         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 530                 if (pos->ls_owner != fl_owner)
 531                         continue;
 532                 atomic_inc(&pos->ls_count);
 533                 return pos;
 534         }
 535         return NULL;
 536 }
 537
 538 /*
 539  * Return a compatible lock_state. If no initialized lock_state structure
 540  * exists, return an uninitialized one.
 541  *
 542  */
 543 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 544 {
 545         struct nfs4_lock_state *lsp;
 546         struct nfs_client *clp = state->owner->so_client;
 547
 548         lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
 549         if (lsp == NULL)
 550                 return NULL;
 551         rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
 552         spin_lock_init(&lsp->ls_sequence.lock);
 553         INIT_LIST_HEAD(&lsp->ls_sequence.list);
 554         lsp->ls_seqid.sequence = &lsp->ls_sequence;
 555         atomic_set(&lsp->ls_count, 1);
 556         lsp->ls_owner = fl_owner;
 557         spin_lock(&clp->cl_lock);
 558         nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
 559         spin_unlock(&clp->cl_lock);
 560         INIT_LIST_HEAD(&lsp->ls_locks);
 561         return lsp;
 562 }
 563
 564 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 565 {
 566         struct nfs_client *clp = lsp->ls_state->owner->so_client;
 567
 568         spin_lock(&clp->cl_lock);
 569         nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
 570         spin_unlock(&clp->cl_lock);
 571         rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
 572         kfree(lsp);
 573 }
 574
 575 /*
 576  * Return a compatible lock_state. If no initialized lock_state structure
 577  * exists, return an uninitialized one.
 578  *
 579  */
 580 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
 581 {
 582         struct nfs4_lock_state *lsp, *new = NULL;
 583
 584         for(;;) {
 585                 spin_lock(&state->state_lock);
 586                 lsp = __nfs4_find_lock_state(state, owner);
 587                 if (lsp != NULL)
 588                         break;
 589                 if (new != NULL) {
 590                         new->ls_state = state;
 591                         list_add(&new->ls_locks, &state->lock_states);
 592                         set_bit(LK_STATE_IN_USE, &state->flags);
 593                         lsp = new;
 594                         new = NULL;
 595                         break;
 596                 }
 597                 spin_unlock(&state->state_lock);
 598                 new = nfs4_alloc_lock_state(state, owner);
 599                 if (new == NULL)
 600                         return NULL;
 601         }
 602         spin_unlock(&state->state_lock);
 603         if (new != NULL)
 604                 nfs4_free_lock_state(new);
 605         return lsp;
 606 }
 607
 608 /*
 609  * Release reference to lock_state, and free it if we see that
 610  * it is no longer in use
 611  */
 612 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 613 {
 614         struct nfs4_state *state;
 615
 616         if (lsp == NULL)
 617                 return;
 618         state = lsp->ls_state;
 619         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 620                 return;
 621         list_del(&lsp->ls_locks);
 622         if (list_empty(&state->lock_states))
 623                 clear_bit(LK_STATE_IN_USE, &state->flags);
 624         spin_unlock(&state->state_lock);
 625         nfs4_free_lock_state(lsp);
 626 }
 627
 628 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 629 {
 630         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 631
 632         dst->fl_u.nfs4_fl.owner = lsp;
 633         atomic_inc(&lsp->ls_count);
 634 }
 635
 636 static void nfs4_fl_release_lock(struct file_lock *fl)
 637 {
 638         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 639 }
 640
 641 static struct file_lock_operations nfs4_fl_lock_ops = {
 642         .fl_copy_lock = nfs4_fl_copy_lock,
 643         .fl_release_private = nfs4_fl_release_lock,
 644 };
 645
 646 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 647 {
 648         struct nfs4_lock_state *lsp;
 649
 650         if (fl->fl_ops != NULL)
 651                 return 0;
 652         lsp = nfs4_get_lock_state(state, fl->fl_owner);
 653         if (lsp == NULL)
 654                 return -ENOMEM;
 655         fl->fl_u.nfs4_fl.owner = lsp;
 656         fl->fl_ops = &nfs4_fl_lock_ops;
 657         return 0;
 658 }
 659
 660 /*
 661  * Byte-range lock aware utility to initialize the stateid of read/write
 662  * requests.
 663  */
 664 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
 665 {
 666         struct nfs4_lock_state *lsp;
 667         int seq;
 668
 669         do {
 670                 seq = read_seqbegin(&state->seqlock);
 671                 memcpy(dst, &state->stateid, sizeof(*dst));
 672         } while (read_seqretry(&state->seqlock, seq));
 673         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 674                 return;
 675
 676         spin_lock(&state->state_lock);
 677         lsp = __nfs4_find_lock_state(state, fl_owner);
 678         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
 679                 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
 680         spin_unlock(&state->state_lock);
 681         nfs4_put_lock_state(lsp);
 682 }
 683
 684 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
 685 {
 686         struct nfs_seqid *new;
 687
 688         new = kmalloc(sizeof(*new), GFP_KERNEL);
 689         if (new != NULL) {
 690                 new->sequence = counter;
 691                 INIT_LIST_HEAD(&new->list);
 692         }
 693         return new;
 694 }
 695
 696 void nfs_free_seqid(struct nfs_seqid *seqid)
 697 {
 698         if (!list_empty(&seqid->list)) {
 699                 struct rpc_sequence *sequence = seqid->sequence->sequence;
 700
 701                 spin_lock(&sequence->lock);
 702                 list_del(&seqid->list);
 703                 spin_unlock(&sequence->lock);
 704                 rpc_wake_up(&sequence->wait);
 705         }
 706         kfree(seqid);
 707 }
 708
 709 /*
 710  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 711  * failed with a seqid incrementing error -
 712  * see comments nfs_fs.h:seqid_mutating_error()
 713  */
 714 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 715 {
 716         BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
 717         switch (status) {
 718                 case 0:
 719                         break;
 720                 case -NFS4ERR_BAD_SEQID:
 721                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 722                                 return;
 723                         printk(KERN_WARNING "NFS: v4 server returned a bad"
 724                                         " sequence-id error on an"
 725                                         " unconfirmed sequence %p!\n",
 726                                         seqid->sequence);
 727                 case -NFS4ERR_STALE_CLIENTID:
 728                 case -NFS4ERR_STALE_STATEID:
 729                 case -NFS4ERR_BAD_STATEID:
 730                 case -NFS4ERR_BADXDR:
 731                 case -NFS4ERR_RESOURCE:
 732                 case -NFS4ERR_NOFILEHANDLE:
 733                         /* Non-seqid mutating errors */
 734                         return;
 735         };
 736         /*
 737          * Note: no locking needed as we are guaranteed to be first
 738          * on the sequence list
 739          */
 740         seqid->sequence->counter++;
 741 }
 742
 743 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
 744 {
 745         if (status == -NFS4ERR_BAD_SEQID) {
 746                 struct nfs4_state_owner *sp = container_of(seqid->sequence,
 747                                 struct nfs4_state_owner, so_seqid);
 748                 nfs4_drop_state_owner(sp);
 749         }
 750         nfs_increment_seqid(status, seqid);
 751 }
 752
 753 /*
 754  * Increment the seqid if the LOCK/LOCKU succeeded, or
 755  * failed with a seqid incrementing error -
 756  * see comments nfs_fs.h:seqid_mutating_error()
 757  */
 758 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
 759 {
 760         nfs_increment_seqid(status, seqid);
 761 }
 762
 763 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
 764 {
 765         struct rpc_sequence *sequence = seqid->sequence->sequence;
 766         int status = 0;
 767
 768         spin_lock(&sequence->lock);
 769         if (list_empty(&seqid->list))
 770                 list_add_tail(&seqid->list, &sequence->list);
 771         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
 772                 goto unlock;
 773         rpc_sleep_on(&sequence->wait, task, NULL);
 774         status = -EAGAIN;
 775 unlock:
 776         spin_unlock(&sequence->lock);
 777         return status;
 778 }
 779
 780 static int nfs4_run_state_manager(void *);
 781
 782 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
 783 {
 784         smp_mb__before_clear_bit();
 785         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 786         smp_mb__after_clear_bit();
 787         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
 788         rpc_wake_up(&clp->cl_rpcwaitq);
 789 }
 790
 791 /*
 792  * Schedule the nfs_client asynchronous state management routine
 793  */
 794 void nfs4_schedule_state_manager(struct nfs_client *clp)
 795 {
 796         struct task_struct *task;
 797
 798         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
 799                 return;
 800         __module_get(THIS_MODULE);
 801         atomic_inc(&clp->cl_count);
 802         task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
 803                                 rpc_peeraddr2str(clp->cl_rpcclient,
 804                                                         RPC_DISPLAY_ADDR));
 805         if (!IS_ERR(task))
 806                 return;
 807         nfs4_clear_state_manager_bit(clp);
 808         nfs_put_client(clp);
 809         module_put(THIS_MODULE);
 810 }
 811
 812 /*
 813  * Schedule a state recovery attempt
 814  */
 815 void nfs4_schedule_state_recovery(struct nfs_client *clp)
 816 {
 817         if (!clp)
 818                 return;
 819         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 820                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
 821         nfs4_schedule_state_manager(clp);
 822 }
 823
 824 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
 825 {
 826
 827         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 828         /* Don't recover state that expired before the reboot */
 829         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
 830                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 831                 return 0;
 832         }
 833         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
 834         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
 835         return 1;
 836 }
 837
 838 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
 839 {
 840         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
 841         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 842         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
 843         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
 844         return 1;
 845 }
 846
 847 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
 848 {
 849         struct inode *inode = state->inode;
 850         struct nfs_inode *nfsi = NFS_I(inode);
 851         struct file_lock *fl;
 852         int status = 0;
 853
 854         down_write(&nfsi->rwsem);
 855         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
 856                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 857                         continue;
 858                 if (nfs_file_open_context(fl->fl_file)->state != state)
 859                         continue;
 860                 status = ops->recover_lock(state, fl);
 861                 if (status >= 0)
 862                         continue;
 863                 switch (status) {
 864                         default:
 865                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
 866                                                 __func__, status);
 867                         case -NFS4ERR_EXPIRED:
 868                         case -NFS4ERR_NO_GRACE:
 869                         case -NFS4ERR_RECLAIM_BAD:
 870                         case -NFS4ERR_RECLAIM_CONFLICT:
 871                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
 872                                 break;
 873                         case -NFS4ERR_STALE_CLIENTID:
 874                                 goto out_err;
 875                 }
 876         }
 877         up_write(&nfsi->rwsem);
 878         return 0;
 879 out_err:
 880         up_write(&nfsi->rwsem);
 881         return status;
 882 }
 883
 884 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
 885 {
 886         struct nfs4_state *state;
 887         struct nfs4_lock_state *lock;
 888         int status = 0;
 889
 890         /* Note: we rely on the sp->so_states list being ordered
 891          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
 892          * states first.
 893          * This is needed to ensure that the server won't give us any
 894          * read delegations that we have to return if, say, we are
 895          * recovering after a network partition or a reboot from a
 896          * server that doesn't support a grace period.
 897          */
 898 restart:
 899         spin_lock(&sp->so_lock);
 900         list_for_each_entry(state, &sp->so_states, open_states) {
 901                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
 902                         continue;
 903                 if (state->state == 0)
 904                         continue;
 905                 atomic_inc(&state->count);
 906                 spin_unlock(&sp->so_lock);
 907                 status = ops->recover_open(sp, state);
 908                 if (status >= 0) {
 909                         status = nfs4_reclaim_locks(state, ops);
 910                         if (status >= 0) {
 911                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
 912                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
 913                                                 printk("%s: Lock reclaim failed!\n",
 914                                                         __func__);
 915                                 }
 916                                 nfs4_put_open_state(state);
 917                                 goto restart;
 918                         }
 919                 }
 920                 switch (status) {
 921                         default:
 922                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
 923                                                 __func__, status);
 924                         case -ENOENT:
 925                         case -ESTALE:
 926                                 /*
 927                                  * Open state on this file cannot be recovered
 928                                  * All we can do is revert to using the zero stateid.
 929                                  */
 930                                 memset(state->stateid.data, 0,
 931                                         sizeof(state->stateid.data));
 932                                 /* Mark the file as being 'closed' */
 933                                 state->state = 0;
 934                                 break;
 935                         case -NFS4ERR_RECLAIM_BAD:
 936                         case -NFS4ERR_RECLAIM_CONFLICT:
 937                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
 938                                 break;
 939                         case -NFS4ERR_EXPIRED:
 940                         case -NFS4ERR_NO_GRACE:
 941                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
 942                         case -NFS4ERR_STALE_CLIENTID:
 943                                 goto out_err;
 944                 }
 945                 nfs4_put_open_state(state);
 946                 goto restart;
 947         }
 948         spin_unlock(&sp->so_lock);
 949         return 0;
 950 out_err:
 951         nfs4_put_open_state(state);
 952         return status;
 953 }
 954
 955 static void nfs4_clear_open_state(struct nfs4_state *state)
 956 {
 957         struct nfs4_lock_state *lock;
 958
 959         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 960         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
 961         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
 962         clear_bit(NFS_O_RDWR_STATE, &state->flags);
 963         list_for_each_entry(lock, &state->lock_states, ls_locks) {
 964                 lock->ls_seqid.flags = 0;
 965                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
 966         }
 967 }
 968
 969 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
 970 {
 971         struct nfs4_state_owner *sp;
 972         struct rb_node *pos;
 973         struct nfs4_state *state;
 974
 975         /* Reset all sequence ids to zero */
 976         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
 977                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 978                 sp->so_seqid.flags = 0;
 979                 spin_lock(&sp->so_lock);
 980                 list_for_each_entry(state, &sp->so_states, open_states) {
 981                         if (mark_reclaim(clp, state))
 982                                 nfs4_clear_open_state(state);
 983                 }
 984                 spin_unlock(&sp->so_lock);
 985         }
 986 }
 987
 988 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
 989 {
 990         /* Mark all delegations for reclaim */
 991         nfs_delegation_mark_reclaim(clp);
 992         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
 993 }
 994
 995 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
 996 {
 997         struct nfs4_state_owner *sp;
 998         struct rb_node *pos;
 999         struct nfs4_state *state;
1000
1001         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1002                 return;
1003
1004         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1005                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1006                 spin_lock(&sp->so_lock);
1007                 list_for_each_entry(state, &sp->so_states, open_states) {
1008                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1009                                 continue;
1010                         nfs4_state_mark_reclaim_nograce(clp, state);
1011                 }
1012                 spin_unlock(&sp->so_lock);
1013         }
1014
1015         nfs_delegation_reap_unclaimed(clp);
1016 }
1017
1018 static void nfs_delegation_clear_all(struct nfs_client *clp)
1019 {
1020         nfs_delegation_mark_reclaim(clp);
1021         nfs_delegation_reap_unclaimed(clp);
1022 }
1023
1024 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1025 {
1026         nfs_delegation_clear_all(clp);
1027         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1028 }
1029
1030 static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp)
1031 {
1032         clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1033 }
1034
1035 static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1036 {
1037         switch (error) {
1038                 case -NFS4ERR_CB_PATH_DOWN:
1039                         nfs_handle_cb_pathdown(clp);
1040                         break;
1041                 case -NFS4ERR_STALE_CLIENTID:
1042                 case -NFS4ERR_LEASE_MOVED:
1043                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1044                         nfs4_state_start_reclaim_reboot(clp);
1045                         break;
1046                 case -NFS4ERR_EXPIRED:
1047                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1048                         nfs4_state_start_reclaim_nograce(clp);
1049                 case -NFS4ERR_BADSESSION:
1050                 case -NFS4ERR_BADSLOT:
1051                 case -NFS4ERR_BAD_HIGH_SLOT:
1052                 case -NFS4ERR_DEADSESSION:
1053                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1054                 case -NFS4ERR_SEQ_FALSE_RETRY:
1055                 case -NFS4ERR_SEQ_MISORDERED:
1056                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
1057         }
1058 }
1059
1060 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1061 {
1062         struct rb_node *pos;
1063         int status = 0;
1064
1065 restart:
1066         spin_lock(&clp->cl_lock);
1067         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1068                 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1069                 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1070                         continue;
1071                 atomic_inc(&sp->so_count);
1072                 spin_unlock(&clp->cl_lock);
1073                 status = nfs4_reclaim_open_state(sp, ops);
1074                 if (status < 0) {
1075                         set_bit(ops->owner_flag_bit, &sp->so_flags);
1076                         nfs4_put_state_owner(sp);
1077                         nfs4_recovery_handle_error(clp, status);
1078                         return status;
1079                 }
1080                 nfs4_put_state_owner(sp);
1081                 goto restart;
1082         }
1083         spin_unlock(&clp->cl_lock);
1084         return status;
1085 }
1086
1087 static int nfs4_check_lease(struct nfs_client *clp)
1088 {
1089         struct rpc_cred *cred;
1090         struct nfs4_state_maintenance_ops *ops =
1091                 nfs4_state_renewal_ops[clp->cl_minorversion];
1092         int status = -NFS4ERR_EXPIRED;
1093
1094         /* Is the client already known to have an expired lease? */
1095         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1096                 return 0;
1097         spin_lock(&clp->cl_lock);
1098         cred = ops->get_state_renewal_cred_locked(clp);
1099         spin_unlock(&clp->cl_lock);
1100         if (cred == NULL) {
1101                 cred = nfs4_get_setclientid_cred(clp);
1102                 if (cred == NULL)
1103                         goto out;
1104         }
1105         status = ops->renew_lease(clp, cred);
1106         put_rpccred(cred);
1107 out:
1108         nfs4_recovery_handle_error(clp, status);
1109         return status;
1110 }
1111
1112 static int nfs4_reclaim_lease(struct nfs_client *clp)
1113 {
1114         struct rpc_cred *cred;
1115         struct nfs4_state_recovery_ops *ops =
1116                 nfs4_reboot_recovery_ops[clp->cl_minorversion];
1117         int status = -ENOENT;
1118
1119         cred = ops->get_clid_cred(clp);
1120         if (cred != NULL) {
1121                 status = ops->establish_clid(clp, cred);
1122                 put_rpccred(cred);
1123                 /* Handle case where the user hasn't set up machine creds */
1124                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1125                         nfs4_clear_machine_cred(clp);
1126                         status = -EAGAIN;
1127                 }
1128                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1129                         status = -EPROTONOSUPPORT;
1130         }
1131         return status;
1132 }
1133
1134 #ifdef CONFIG_NFS_V4_1
1135 static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
1136 {
1137         switch (err) {
1138         case -NFS4ERR_STALE_CLIENTID:
1139                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1140                 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
1141         }
1142 }
1143
1144 static int nfs4_reset_session(struct nfs_client *clp)
1145 {
1146         int status;
1147
1148         status = nfs4_proc_destroy_session(clp->cl_session);
1149         if (status && status != -NFS4ERR_BADSESSION &&
1150             status != -NFS4ERR_DEADSESSION) {
1151                 nfs4_session_recovery_handle_error(clp, status);
1152                 goto out;
1153         }
1154
1155         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1156         status = nfs4_proc_create_session(clp, 1);
1157         if (status)
1158                 nfs4_session_recovery_handle_error(clp, status);
1159                 /* fall through*/
1160 out:
1161         /* Wake up the next rpc task even on error */
1162         rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq);
1163         return status;
1164 }
1165
1166 static int nfs4_initialize_session(struct nfs_client *clp)
1167 {
1168         int status;
1169
1170         status = nfs4_proc_create_session(clp, 0);
1171         if (!status) {
1172                 nfs_mark_client_ready(clp, NFS_CS_READY);
1173         } else if (status == -NFS4ERR_STALE_CLIENTID) {
1174                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1175                 set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
1176         } else {
1177                 nfs_mark_client_ready(clp, status);
1178         }
1179         return status;
1180 }
1181 #else /* CONFIG_NFS_V4_1 */
1182 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1183 static int nfs4_initialize_session(struct nfs_client *clp) { return 0; }
1184 #endif /* CONFIG_NFS_V4_1 */
1185
1186 static void nfs4_state_manager(struct nfs_client *clp)
1187 {
1188         int status = 0;
1189
1190         /* Ensure exclusive access to NFSv4 state */
1191         for(;;) {
1192                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1193                         /* We're going to have to re-establish a clientid */
1194                         status = nfs4_reclaim_lease(clp);
1195                         if (status) {
1196                                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1197                                 if (status == -EAGAIN)
1198                                         continue;
1199                                 if (clp->cl_cons_state ==
1200                                                         NFS_CS_SESSION_INITING)
1201                                         nfs_mark_client_ready(clp, status);
1202                                 goto out_error;
1203                         }
1204                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1205                 }
1206
1207                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1208                         status = nfs4_check_lease(clp);
1209                         if (status != 0)
1210                                 continue;
1211                 }
1212                 /* Initialize or reset the session */
1213                 if (nfs4_has_session(clp) &&
1214                    test_and_clear_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
1215                         if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1216                                 status = nfs4_initialize_session(clp);
1217                         else
1218                                 status = nfs4_reset_session(clp);
1219                         if (status) {
1220                                 if (status == -NFS4ERR_STALE_CLIENTID)
1221                                         continue;
1222                                 goto out_error;
1223                         }
1224                 }
1225                 /* First recover reboot state... */
1226                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1227                         status = nfs4_do_reclaim(clp,
1228                                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1229                         if (status == -NFS4ERR_STALE_CLIENTID)
1230                                 continue;
1231                         if (test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
1232                                 continue;
1233                         nfs4_state_end_reclaim_reboot(clp);
1234                         continue;
1235                 }
1236
1237                 /* Now recover expired state... */
1238                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1239                         status = nfs4_do_reclaim(clp,
1240                                 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
1241                         if (status < 0) {
1242                                 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1243                                 if (status == -NFS4ERR_STALE_CLIENTID)
1244                                         continue;
1245                                 if (status == -NFS4ERR_EXPIRED)
1246                                         continue;
1247                                 if (test_bit(NFS4CLNT_SESSION_SETUP,
1248                                                                 &clp->cl_state))
1249                                         continue;
1250                                 goto out_error;
1251                         } else
1252                                 nfs4_state_end_reclaim_nograce(clp);
1253                         continue;
1254                 }
1255
1256                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1257                         nfs_client_return_marked_delegations(clp);
1258                         continue;
1259                 }
1260
1261                 nfs4_clear_state_manager_bit(clp);
1262                 /* Did we race with an attempt to give us more work? */
1263                 if (clp->cl_state == 0)
1264                         break;
1265                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1266                         break;
1267         }
1268         return;
1269 out_error:
1270         printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1271                         " with error %d\n", clp->cl_hostname, -status);
1272         if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1273                 nfs4_state_end_reclaim_reboot(clp);
1274         nfs4_clear_state_manager_bit(clp);
1275 }
1276
1277 static int nfs4_run_state_manager(void *ptr)
1278 {
1279         struct nfs_client *clp = ptr;
1280
1281         allow_signal(SIGKILL);
1282         nfs4_state_manager(clp);
1283         nfs_put_client(clp);
1284         module_put_and_exit(0);
1285         return 0;
1286 }
1287
1288 /*
1289  * Local variables:
1290  *  c-basic-offset: 8
1291  * End:
1292  */