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