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 static int nfs41_setup_state_renewal(struct nfs_client *clp)
 120 {
 121         int status;
 122         struct nfs_fsinfo fsinfo;
 123
 124         status = nfs4_proc_get_lease_time(clp, &fsinfo);
 125         if (status == 0) {
 126                 /* Update lease time and schedule renewal */
 127                 spin_lock(&clp->cl_lock);
 128                 clp->cl_lease_time = fsinfo.lease_time * HZ;
 129                 clp->cl_last_renewal = jiffies;
 130                 spin_unlock(&clp->cl_lock);
 131
 132                 nfs4_schedule_state_renewal(clp);
 133         }
 134
 135         return status;
 136 }
 137
 138 static void nfs4_end_drain_session(struct nfs_client *clp)
 139 {
 140         struct nfs4_session *ses = clp->cl_session;
 141         int max_slots;
 142
 143         if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
 144                 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
 145                 max_slots = ses->fc_slot_table.max_slots;
 146                 while (max_slots--) {
 147                         struct rpc_task *task;
 148
 149                         task = rpc_wake_up_next(&ses->fc_slot_table.
 150                                                 slot_tbl_waitq);
 151                         if (!task)
 152                                 break;
 153                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 154                 }
 155                 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
 156         }
 157 }
 158
 159 static int nfs4_begin_drain_session(struct nfs_client *clp)
 160 {
 161         struct nfs4_session *ses = clp->cl_session;
 162         struct nfs4_slot_table *tbl = &ses->fc_slot_table;
 163
 164         spin_lock(&tbl->slot_tbl_lock);
 165         set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
 166         if (tbl->highest_used_slotid != -1) {
 167                 INIT_COMPLETION(ses->complete);
 168                 spin_unlock(&tbl->slot_tbl_lock);
 169                 return wait_for_completion_interruptible(&ses->complete);
 170         }
 171         spin_unlock(&tbl->slot_tbl_lock);
 172         return 0;
 173 }
 174
 175 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 176 {
 177         int status;
 178
 179         status = nfs4_proc_exchange_id(clp, cred);
 180         if (status != 0)
 181                 goto out;
 182         status = nfs4_proc_create_session(clp);
 183         if (status != 0)
 184                 goto out;
 185         nfs41_setup_state_renewal(clp);
 186         nfs_mark_client_ready(clp, NFS_CS_READY);
 187 out:
 188         return status;
 189 }
 190
 191 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 192 {
 193         struct rpc_cred *cred;
 194
 195         spin_lock(&clp->cl_lock);
 196         cred = nfs4_get_machine_cred_locked(clp);
 197         spin_unlock(&clp->cl_lock);
 198         return cred;
 199 }
 200
 201 #endif /* CONFIG_NFS_V4_1 */
 202
 203 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 204 {
 205         struct nfs4_state_owner *sp;
 206         struct rb_node *pos;
 207         struct rpc_cred *cred;
 208
 209         spin_lock(&clp->cl_lock);
 210         cred = nfs4_get_machine_cred_locked(clp);
 211         if (cred != NULL)
 212                 goto out;
 213         pos = rb_first(&clp->cl_state_owners);
 214         if (pos != NULL) {
 215                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 216                 cred = get_rpccred(sp->so_cred);
 217         }
 218 out:
 219         spin_unlock(&clp->cl_lock);
 220         return cred;
 221 }
 222
 223 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
 224                 __u64 minval, int maxbits)
 225 {
 226         struct rb_node **p, *parent;
 227         struct nfs_unique_id *pos;
 228         __u64 mask = ~0ULL;
 229
 230         if (maxbits < 64)
 231                 mask = (1ULL << maxbits) - 1ULL;
 232
 233         /* Ensure distribution is more or less flat */
 234         get_random_bytes(&new->id, sizeof(new->id));
 235         new->id &= mask;
 236         if (new->id < minval)
 237                 new->id += minval;
 238 retry:
 239         p = &root->rb_node;
 240         parent = NULL;
 241
 242         while (*p != NULL) {
 243                 parent = *p;
 244                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 245
 246                 if (new->id < pos->id)
 247                         p = &(*p)->rb_left;
 248                 else if (new->id > pos->id)
 249                         p = &(*p)->rb_right;
 250                 else
 251                         goto id_exists;
 252         }
 253         rb_link_node(&new->rb_node, parent, p);
 254         rb_insert_color(&new->rb_node, root);
 255         return;
 256 id_exists:
 257         for (;;) {
 258                 new->id++;
 259                 if (new->id < minval || (new->id & mask) != new->id) {
 260                         new->id = minval;
 261                         break;
 262                 }
 263                 parent = rb_next(parent);
 264                 if (parent == NULL)
 265                         break;
 266                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 267                 if (new->id < pos->id)
 268                         break;
 269         }
 270         goto retry;
 271 }
 272
 273 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 274 {
 275         rb_erase(&id->rb_node, root);
 276 }
 277
 278 static struct nfs4_state_owner *
 279 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 280 {
 281         struct nfs_client *clp = server->nfs_client;
 282         struct rb_node **p = &clp->cl_state_owners.rb_node,
 283                        *parent = NULL;
 284         struct nfs4_state_owner *sp, *res = NULL;
 285
 286         while (*p != NULL) {
 287                 parent = *p;
 288                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 289
 290                 if (server < sp->so_server) {
 291                         p = &parent->rb_left;
 292                         continue;
 293                 }
 294                 if (server > sp->so_server) {
 295                         p = &parent->rb_right;
 296                         continue;
 297                 }
 298                 if (cred < sp->so_cred)
 299                         p = &parent->rb_left;
 300                 else if (cred > sp->so_cred)
 301                         p = &parent->rb_right;
 302                 else {
 303                         atomic_inc(&sp->so_count);
 304                         res = sp;
 305                         break;
 306                 }
 307         }
 308         return res;
 309 }
 310
 311 static struct nfs4_state_owner *
 312 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
 313 {
 314         struct rb_node **p = &clp->cl_state_owners.rb_node,
 315                        *parent = NULL;
 316         struct nfs4_state_owner *sp;
 317
 318         while (*p != NULL) {
 319                 parent = *p;
 320                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 321
 322                 if (new->so_server < sp->so_server) {
 323                         p = &parent->rb_left;
 324                         continue;
 325                 }
 326                 if (new->so_server > sp->so_server) {
 327                         p = &parent->rb_right;
 328                         continue;
 329                 }
 330                 if (new->so_cred < sp->so_cred)
 331                         p = &parent->rb_left;
 332                 else if (new->so_cred > sp->so_cred)
 333                         p = &parent->rb_right;
 334                 else {
 335                         atomic_inc(&sp->so_count);
 336                         return sp;
 337                 }
 338         }
 339         nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
 340         rb_link_node(&new->so_client_node, parent, p);
 341         rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
 342         return new;
 343 }
 344
 345 static void
 346 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
 347 {
 348         if (!RB_EMPTY_NODE(&sp->so_client_node))
 349                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 350         nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
 351 }
 352
 353 /*
 354  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 355  * create a new state_owner.
 356  *
 357  */
 358 static struct nfs4_state_owner *
 359 nfs4_alloc_state_owner(void)
 360 {
 361         struct nfs4_state_owner *sp;
 362
 363         sp = kzalloc(sizeof(*sp),GFP_KERNEL);
 364         if (!sp)
 365                 return NULL;
 366         spin_lock_init(&sp->so_lock);
 367         INIT_LIST_HEAD(&sp->so_states);
 368         INIT_LIST_HEAD(&sp->so_delegations);
 369         rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
 370         sp->so_seqid.sequence = &sp->so_sequence;
 371         spin_lock_init(&sp->so_sequence.lock);
 372         INIT_LIST_HEAD(&sp->so_sequence.list);
 373         atomic_set(&sp->so_count, 1);
 374         return sp;
 375 }
 376
 377 static void
 378 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 379 {
 380         if (!RB_EMPTY_NODE(&sp->so_client_node)) {
 381                 struct nfs_client *clp = sp->so_client;
 382
 383                 spin_lock(&clp->cl_lock);
 384                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 385                 RB_CLEAR_NODE(&sp->so_client_node);
 386                 spin_unlock(&clp->cl_lock);
 387         }
 388 }
 389
 390 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 391 {
 392         struct nfs_client *clp = server->nfs_client;
 393         struct nfs4_state_owner *sp, *new;
 394
 395         spin_lock(&clp->cl_lock);
 396         sp = nfs4_find_state_owner(server, cred);
 397         spin_unlock(&clp->cl_lock);
 398         if (sp != NULL)
 399                 return sp;
 400         new = nfs4_alloc_state_owner();
 401         if (new == NULL)
 402                 return NULL;
 403         new->so_client = clp;
 404         new->so_server = server;
 405         new->so_cred = cred;
 406         spin_lock(&clp->cl_lock);
 407         sp = nfs4_insert_state_owner(clp, new);
 408         spin_unlock(&clp->cl_lock);
 409         if (sp == new)
 410                 get_rpccred(cred);
 411         else {
 412                 rpc_destroy_wait_queue(&new->so_sequence.wait);
 413                 kfree(new);
 414         }
 415         return sp;
 416 }
 417
 418 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 419 {
 420         struct nfs_client *clp = sp->so_client;
 421         struct rpc_cred *cred = sp->so_cred;
 422
 423         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 424                 return;
 425         nfs4_remove_state_owner(clp, sp);
 426         spin_unlock(&clp->cl_lock);
 427         rpc_destroy_wait_queue(&sp->so_sequence.wait);
 428         put_rpccred(cred);
 429         kfree(sp);
 430 }
 431
 432 static struct nfs4_state *
 433 nfs4_alloc_open_state(void)
 434 {
 435         struct nfs4_state *state;
 436
 437         state = kzalloc(sizeof(*state), GFP_KERNEL);
 438         if (!state)
 439                 return NULL;
 440         atomic_set(&state->count, 1);
 441         INIT_LIST_HEAD(&state->lock_states);
 442         spin_lock_init(&state->state_lock);
 443         seqlock_init(&state->seqlock);
 444         return state;
 445 }
 446
 447 void
 448 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 449 {
 450         if (state->state == fmode)
 451                 return;
 452         /* NB! List reordering - see the reclaim code for why.  */
 453         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 454                 if (fmode & FMODE_WRITE)
 455                         list_move(&state->open_states, &state->owner->so_states);
 456                 else
 457                         list_move_tail(&state->open_states, &state->owner->so_states);
 458         }
 459         state->state = fmode;
 460 }
 461
 462 static struct nfs4_state *
 463 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 464 {
 465         struct nfs_inode *nfsi = NFS_I(inode);
 466         struct nfs4_state *state;
 467
 468         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 469                 if (state->owner != owner)
 470                         continue;
 471                 if (atomic_inc_not_zero(&state->count))
 472                         return state;
 473         }
 474         return NULL;
 475 }
 476
 477 static void
 478 nfs4_free_open_state(struct nfs4_state *state)
 479 {
 480         kfree(state);
 481 }
 482
 483 struct nfs4_state *
 484 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 485 {
 486         struct nfs4_state *state, *new;
 487         struct nfs_inode *nfsi = NFS_I(inode);
 488
 489         spin_lock(&inode->i_lock);
 490         state = __nfs4_find_state_byowner(inode, owner);
 491         spin_unlock(&inode->i_lock);
 492         if (state)
 493                 goto out;
 494         new = nfs4_alloc_open_state();
 495         spin_lock(&owner->so_lock);
 496         spin_lock(&inode->i_lock);
 497         state = __nfs4_find_state_byowner(inode, owner);
 498         if (state == NULL && new != NULL) {
 499                 state = new;
 500                 state->owner = owner;
 501                 atomic_inc(&owner->so_count);
 502                 list_add(&state->inode_states, &nfsi->open_states);
 503                 state->inode = igrab(inode);
 504                 spin_unlock(&inode->i_lock);
 505                 /* Note: The reclaim code dictates that we add stateless
 506                  * and read-only stateids to the end of the list */
 507                 list_add_tail(&state->open_states, &owner->so_states);
 508                 spin_unlock(&owner->so_lock);
 509         } else {
 510                 spin_unlock(&inode->i_lock);
 511                 spin_unlock(&owner->so_lock);
 512                 if (new)
 513                         nfs4_free_open_state(new);
 514         }
 515 out:
 516         return state;
 517 }
 518
 519 void nfs4_put_open_state(struct nfs4_state *state)
 520 {
 521         struct inode *inode = state->inode;
 522         struct nfs4_state_owner *owner = state->owner;
 523
 524         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 525                 return;
 526         spin_lock(&inode->i_lock);
 527         list_del(&state->inode_states);
 528         list_del(&state->open_states);
 529         spin_unlock(&inode->i_lock);
 530         spin_unlock(&owner->so_lock);
 531         iput(inode);
 532         nfs4_free_open_state(state);
 533         nfs4_put_state_owner(owner);
 534 }
 535
 536 /*
 537  * Close the current file.
 538  */
 539 static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
 540 {
 541         struct nfs4_state_owner *owner = state->owner;
 542         int call_close = 0;
 543         fmode_t newstate;
 544
 545         atomic_inc(&owner->so_count);
 546         /* Protect against nfs4_find_state() */
 547         spin_lock(&owner->so_lock);
 548         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 549                 case FMODE_READ:
 550                         state->n_rdonly--;
 551                         break;
 552                 case FMODE_WRITE:
 553                         state->n_wronly--;
 554                         break;
 555                 case FMODE_READ|FMODE_WRITE:
 556                         state->n_rdwr--;
 557         }
 558         newstate = FMODE_READ|FMODE_WRITE;
 559         if (state->n_rdwr == 0) {
 560                 if (state->n_rdonly == 0) {
 561                         newstate &= ~FMODE_READ;
 562                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 563                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 564                 }
 565                 if (state->n_wronly == 0) {
 566                         newstate &= ~FMODE_WRITE;
 567                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 568                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 569                 }
 570                 if (newstate == 0)
 571                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 572         }
 573         nfs4_state_set_mode_locked(state, newstate);
 574         spin_unlock(&owner->so_lock);
 575
 576         if (!call_close) {
 577                 nfs4_put_open_state(state);
 578                 nfs4_put_state_owner(owner);
 579         } else
 580                 nfs4_do_close(path, state, wait);
 581 }
 582
 583 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
 584 {
 585         __nfs4_close(path, state, fmode, 0);
 586 }
 587
 588 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
 589 {
 590         __nfs4_close(path, state, fmode, 1);
 591 }
 592
 593 /*
 594  * Search the state->lock_states for an existing lock_owner
 595  * that is compatible with current->files
 596  */
 597 static struct nfs4_lock_state *
 598 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 599 {
 600         struct nfs4_lock_state *pos;
 601         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 602                 if (pos->ls_owner != fl_owner)
 603                         continue;
 604                 atomic_inc(&pos->ls_count);
 605                 return pos;
 606         }
 607         return NULL;
 608 }
 609
 610 /*
 611  * Return a compatible lock_state. If no initialized lock_state structure
 612  * exists, return an uninitialized one.
 613  *
 614  */
 615 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 616 {
 617         struct nfs4_lock_state *lsp;
 618         struct nfs_client *clp = state->owner->so_client;
 619
 620         lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
 621         if (lsp == NULL)
 622                 return NULL;
 623         rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
 624         spin_lock_init(&lsp->ls_sequence.lock);
 625         INIT_LIST_HEAD(&lsp->ls_sequence.list);
 626         lsp->ls_seqid.sequence = &lsp->ls_sequence;
 627         atomic_set(&lsp->ls_count, 1);
 628         lsp->ls_state = state;
 629         lsp->ls_owner = fl_owner;
 630         spin_lock(&clp->cl_lock);
 631         nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
 632         spin_unlock(&clp->cl_lock);
 633         INIT_LIST_HEAD(&lsp->ls_locks);
 634         return lsp;
 635 }
 636
 637 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 638 {
 639         struct nfs_client *clp = lsp->ls_state->owner->so_client;
 640
 641         spin_lock(&clp->cl_lock);
 642         nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
 643         spin_unlock(&clp->cl_lock);
 644         rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
 645         kfree(lsp);
 646 }
 647
 648 /*
 649  * Return a compatible lock_state. If no initialized lock_state structure
 650  * exists, return an uninitialized one.
 651  *
 652  */
 653 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
 654 {
 655         struct nfs4_lock_state *lsp, *new = NULL;
 656
 657         for(;;) {
 658                 spin_lock(&state->state_lock);
 659                 lsp = __nfs4_find_lock_state(state, owner);
 660                 if (lsp != NULL)
 661                         break;
 662                 if (new != NULL) {
 663                         list_add(&new->ls_locks, &state->lock_states);
 664                         set_bit(LK_STATE_IN_USE, &state->flags);
 665                         lsp = new;
 666                         new = NULL;
 667                         break;
 668                 }
 669                 spin_unlock(&state->state_lock);
 670                 new = nfs4_alloc_lock_state(state, owner);
 671                 if (new == NULL)
 672                         return NULL;
 673         }
 674         spin_unlock(&state->state_lock);
 675         if (new != NULL)
 676                 nfs4_free_lock_state(new);
 677         return lsp;
 678 }
 679
 680 /*
 681  * Release reference to lock_state, and free it if we see that
 682  * it is no longer in use
 683  */
 684 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 685 {
 686         struct nfs4_state *state;
 687
 688         if (lsp == NULL)
 689                 return;
 690         state = lsp->ls_state;
 691         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 692                 return;
 693         list_del(&lsp->ls_locks);
 694         if (list_empty(&state->lock_states))
 695                 clear_bit(LK_STATE_IN_USE, &state->flags);
 696         spin_unlock(&state->state_lock);
 697         nfs4_free_lock_state(lsp);
 698 }
 699
 700 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 701 {
 702         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 703
 704         dst->fl_u.nfs4_fl.owner = lsp;
 705         atomic_inc(&lsp->ls_count);
 706 }
 707
 708 static void nfs4_fl_release_lock(struct file_lock *fl)
 709 {
 710         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 711 }
 712
 713 static const struct file_lock_operations nfs4_fl_lock_ops = {
 714         .fl_copy_lock = nfs4_fl_copy_lock,
 715         .fl_release_private = nfs4_fl_release_lock,
 716 };
 717
 718 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 719 {
 720         struct nfs4_lock_state *lsp;
 721
 722         if (fl->fl_ops != NULL)
 723                 return 0;
 724         lsp = nfs4_get_lock_state(state, fl->fl_owner);
 725         if (lsp == NULL)
 726                 return -ENOMEM;
 727         fl->fl_u.nfs4_fl.owner = lsp;
 728         fl->fl_ops = &nfs4_fl_lock_ops;
 729         return 0;
 730 }
 731
 732 /*
 733  * Byte-range lock aware utility to initialize the stateid of read/write
 734  * requests.
 735  */
 736 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
 737 {
 738         struct nfs4_lock_state *lsp;
 739         int seq;
 740
 741         do {
 742                 seq = read_seqbegin(&state->seqlock);
 743                 memcpy(dst, &state->stateid, sizeof(*dst));
 744         } while (read_seqretry(&state->seqlock, seq));
 745         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 746                 return;
 747
 748         spin_lock(&state->state_lock);
 749         lsp = __nfs4_find_lock_state(state, fl_owner);
 750         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
 751                 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
 752         spin_unlock(&state->state_lock);
 753         nfs4_put_lock_state(lsp);
 754 }
 755
 756 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
 757 {
 758         struct nfs_seqid *new;
 759
 760         new = kmalloc(sizeof(*new), GFP_KERNEL);
 761         if (new != NULL) {
 762                 new->sequence = counter;
 763                 INIT_LIST_HEAD(&new->list);
 764         }
 765         return new;
 766 }
 767
 768 void nfs_release_seqid(struct nfs_seqid *seqid)
 769 {
 770         if (!list_empty(&seqid->list)) {
 771                 struct rpc_sequence *sequence = seqid->sequence->sequence;
 772
 773                 spin_lock(&sequence->lock);
 774                 list_del_init(&seqid->list);
 775                 spin_unlock(&sequence->lock);
 776                 rpc_wake_up(&sequence->wait);
 777         }
 778 }
 779
 780 void nfs_free_seqid(struct nfs_seqid *seqid)
 781 {
 782         nfs_release_seqid(seqid);
 783         kfree(seqid);
 784 }
 785
 786 /*
 787  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 788  * failed with a seqid incrementing error -
 789  * see comments nfs_fs.h:seqid_mutating_error()
 790  */
 791 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 792 {
 793         BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
 794         switch (status) {
 795                 case 0:
 796                         break;
 797                 case -NFS4ERR_BAD_SEQID:
 798                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 799                                 return;
 800                         printk(KERN_WARNING "NFS: v4 server returned a bad"
 801                                         " sequence-id error on an"
 802                                         " unconfirmed sequence %p!\n",
 803                                         seqid->sequence);
 804                 case -NFS4ERR_STALE_CLIENTID:
 805                 case -NFS4ERR_STALE_STATEID:
 806                 case -NFS4ERR_BAD_STATEID:
 807                 case -NFS4ERR_BADXDR:
 808                 case -NFS4ERR_RESOURCE:
 809                 case -NFS4ERR_NOFILEHANDLE:
 810                         /* Non-seqid mutating errors */
 811                         return;
 812         };
 813         /*
 814          * Note: no locking needed as we are guaranteed to be first
 815          * on the sequence list
 816          */
 817         seqid->sequence->counter++;
 818 }
 819
 820 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
 821 {
 822         struct nfs4_state_owner *sp = container_of(seqid->sequence,
 823                                         struct nfs4_state_owner, so_seqid);
 824         struct nfs_server *server = sp->so_server;
 825
 826         if (status == -NFS4ERR_BAD_SEQID)
 827                 nfs4_drop_state_owner(sp);
 828         if (!nfs4_has_session(server->nfs_client))
 829                 nfs_increment_seqid(status, seqid);
 830 }
 831
 832 /*
 833  * Increment the seqid if the LOCK/LOCKU succeeded, or
 834  * failed with a seqid incrementing error -
 835  * see comments nfs_fs.h:seqid_mutating_error()
 836  */
 837 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
 838 {
 839         nfs_increment_seqid(status, seqid);
 840 }
 841
 842 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
 843 {
 844         struct rpc_sequence *sequence = seqid->sequence->sequence;
 845         int status = 0;
 846
 847         spin_lock(&sequence->lock);
 848         if (list_empty(&seqid->list))
 849                 list_add_tail(&seqid->list, &sequence->list);
 850         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
 851                 goto unlock;
 852         rpc_sleep_on(&sequence->wait, task, NULL);
 853         status = -EAGAIN;
 854 unlock:
 855         spin_unlock(&sequence->lock);
 856         return status;
 857 }
 858
 859 static int nfs4_run_state_manager(void *);
 860
 861 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
 862 {
 863         smp_mb__before_clear_bit();
 864         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 865         smp_mb__after_clear_bit();
 866         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
 867         rpc_wake_up(&clp->cl_rpcwaitq);
 868 }
 869
 870 /*
 871  * Schedule the nfs_client asynchronous state management routine
 872  */
 873 void nfs4_schedule_state_manager(struct nfs_client *clp)
 874 {
 875         struct task_struct *task;
 876
 877         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
 878                 return;
 879         __module_get(THIS_MODULE);
 880         atomic_inc(&clp->cl_count);
 881         task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
 882                                 rpc_peeraddr2str(clp->cl_rpcclient,
 883                                                         RPC_DISPLAY_ADDR));
 884         if (!IS_ERR(task))
 885                 return;
 886         nfs4_clear_state_manager_bit(clp);
 887         nfs_put_client(clp);
 888         module_put(THIS_MODULE);
 889 }
 890
 891 /*
 892  * Schedule a state recovery attempt
 893  */
 894 void nfs4_schedule_state_recovery(struct nfs_client *clp)
 895 {
 896         if (!clp)
 897                 return;
 898         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 899                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
 900         nfs4_schedule_state_manager(clp);
 901 }
 902
 903 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
 904 {
 905
 906         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 907         /* Don't recover state that expired before the reboot */
 908         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
 909                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 910                 return 0;
 911         }
 912         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
 913         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
 914         return 1;
 915 }
 916
 917 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
 918 {
 919         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
 920         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 921         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
 922         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
 923         return 1;
 924 }
 925
 926 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
 927 {
 928         struct inode *inode = state->inode;
 929         struct nfs_inode *nfsi = NFS_I(inode);
 930         struct file_lock *fl;
 931         int status = 0;
 932
 933         if (inode->i_flock == NULL)
 934                 return 0;
 935
 936         /* Guard against delegation returns and new lock/unlock calls */
 937         down_write(&nfsi->rwsem);
 938         /* Protect inode->i_flock using the BKL */
 939         lock_kernel();
 940         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
 941                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 942                         continue;
 943                 if (nfs_file_open_context(fl->fl_file)->state != state)
 944                         continue;
 945                 unlock_kernel();
 946                 status = ops->recover_lock(state, fl);
 947                 switch (status) {
 948                         case 0:
 949                                 break;
 950                         case -ESTALE:
 951                         case -NFS4ERR_ADMIN_REVOKED:
 952                         case -NFS4ERR_STALE_STATEID:
 953                         case -NFS4ERR_BAD_STATEID:
 954                         case -NFS4ERR_EXPIRED:
 955                         case -NFS4ERR_NO_GRACE:
 956                         case -NFS4ERR_STALE_CLIENTID:
 957                         case -NFS4ERR_BADSESSION:
 958                         case -NFS4ERR_BADSLOT:
 959                         case -NFS4ERR_BAD_HIGH_SLOT:
 960                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 961                                 goto out;
 962                         default:
 963                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
 964                                                 __func__, status);
 965                         case -ENOMEM:
 966                         case -NFS4ERR_DENIED:
 967                         case -NFS4ERR_RECLAIM_BAD:
 968                         case -NFS4ERR_RECLAIM_CONFLICT:
 969                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
 970                                 status = 0;
 971                 }
 972                 lock_kernel();
 973         }
 974         unlock_kernel();
 975 out:
 976         up_write(&nfsi->rwsem);
 977         return status;
 978 }
 979
 980 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
 981 {
 982         struct nfs4_state *state;
 983         struct nfs4_lock_state *lock;
 984         int status = 0;
 985
 986         /* Note: we rely on the sp->so_states list being ordered
 987          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
 988          * states first.
 989          * This is needed to ensure that the server won't give us any
 990          * read delegations that we have to return if, say, we are
 991          * recovering after a network partition or a reboot from a
 992          * server that doesn't support a grace period.
 993          */
 994 restart:
 995         spin_lock(&sp->so_lock);
 996         list_for_each_entry(state, &sp->so_states, open_states) {
 997                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
 998                         continue;
 999                 if (state->state == 0)
1000                         continue;
1001                 atomic_inc(&state->count);
1002                 spin_unlock(&sp->so_lock);
1003                 status = ops->recover_open(sp, state);
1004                 if (status >= 0) {
1005                         status = nfs4_reclaim_locks(state, ops);
1006                         if (status >= 0) {
1007                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1008                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1009                                                 printk("%s: Lock reclaim failed!\n",
1010                                                         __func__);
1011                                 }
1012                                 nfs4_put_open_state(state);
1013                                 goto restart;
1014                         }
1015                 }
1016                 switch (status) {
1017                         default:
1018                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1019                                                 __func__, status);
1020                         case -ENOENT:
1021                         case -ENOMEM:
1022                         case -ESTALE:
1023                                 /*
1024                                  * Open state on this file cannot be recovered
1025                                  * All we can do is revert to using the zero stateid.
1026                                  */
1027                                 memset(state->stateid.data, 0,
1028                                         sizeof(state->stateid.data));
1029                                 /* Mark the file as being 'closed' */
1030                                 state->state = 0;
1031                                 break;
1032                         case -NFS4ERR_ADMIN_REVOKED:
1033                         case -NFS4ERR_STALE_STATEID:
1034                         case -NFS4ERR_BAD_STATEID:
1035                         case -NFS4ERR_RECLAIM_BAD:
1036                         case -NFS4ERR_RECLAIM_CONFLICT:
1037                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
1038                                 break;
1039                         case -NFS4ERR_EXPIRED:
1040                         case -NFS4ERR_NO_GRACE:
1041                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
1042                         case -NFS4ERR_STALE_CLIENTID:
1043                         case -NFS4ERR_BADSESSION:
1044                         case -NFS4ERR_BADSLOT:
1045                         case -NFS4ERR_BAD_HIGH_SLOT:
1046                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1047                                 goto out_err;
1048                 }
1049                 nfs4_put_open_state(state);
1050                 goto restart;
1051         }
1052         spin_unlock(&sp->so_lock);
1053         return 0;
1054 out_err:
1055         nfs4_put_open_state(state);
1056         return status;
1057 }
1058
1059 static void nfs4_clear_open_state(struct nfs4_state *state)
1060 {
1061         struct nfs4_lock_state *lock;
1062
1063         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1064         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1065         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1066         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1067         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1068                 lock->ls_seqid.flags = 0;
1069                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1070         }
1071 }
1072
1073 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1074 {
1075         struct nfs4_state_owner *sp;
1076         struct rb_node *pos;
1077         struct nfs4_state *state;
1078
1079         /* Reset all sequence ids to zero */
1080         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1081                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1082                 sp->so_seqid.flags = 0;
1083                 spin_lock(&sp->so_lock);
1084                 list_for_each_entry(state, &sp->so_states, open_states) {
1085                         if (mark_reclaim(clp, state))
1086                                 nfs4_clear_open_state(state);
1087                 }
1088                 spin_unlock(&sp->so_lock);
1089         }
1090 }
1091
1092 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1093 {
1094         /* Mark all delegations for reclaim */
1095         nfs_delegation_mark_reclaim(clp);
1096         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1097 }
1098
1099 static void nfs4_reclaim_complete(struct nfs_client *clp,
1100                                  const struct nfs4_state_recovery_ops *ops)
1101 {
1102         /* Notify the server we're done reclaiming our state */
1103         if (ops->reclaim_complete)
1104                 (void)ops->reclaim_complete(clp);
1105 }
1106
1107 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1108 {
1109         struct nfs4_state_owner *sp;
1110         struct rb_node *pos;
1111         struct nfs4_state *state;
1112
1113         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1114                 return;
1115
1116         nfs4_reclaim_complete(clp,
1117                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1118
1119         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1120                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1121                 spin_lock(&sp->so_lock);
1122                 list_for_each_entry(state, &sp->so_states, open_states) {
1123                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1124                                 continue;
1125                         nfs4_state_mark_reclaim_nograce(clp, state);
1126                 }
1127                 spin_unlock(&sp->so_lock);
1128         }
1129
1130         nfs_delegation_reap_unclaimed(clp);
1131 }
1132
1133 static void nfs_delegation_clear_all(struct nfs_client *clp)
1134 {
1135         nfs_delegation_mark_reclaim(clp);
1136         nfs_delegation_reap_unclaimed(clp);
1137 }
1138
1139 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1140 {
1141         nfs_delegation_clear_all(clp);
1142         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1143 }
1144
1145 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1146 {
1147         switch (error) {
1148                 case -NFS4ERR_CB_PATH_DOWN:
1149                         nfs_handle_cb_pathdown(clp);
1150                         return 0;
1151                 case -NFS4ERR_NO_GRACE:
1152                         nfs4_state_end_reclaim_reboot(clp);
1153                         return 0;
1154                 case -NFS4ERR_STALE_CLIENTID:
1155                 case -NFS4ERR_LEASE_MOVED:
1156                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1157                         nfs4_state_end_reclaim_reboot(clp);
1158                         nfs4_state_start_reclaim_reboot(clp);
1159                         break;
1160                 case -NFS4ERR_EXPIRED:
1161                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1162                         nfs4_state_start_reclaim_nograce(clp);
1163                         break;
1164                 case -NFS4ERR_BADSESSION:
1165                 case -NFS4ERR_BADSLOT:
1166                 case -NFS4ERR_BAD_HIGH_SLOT:
1167                 case -NFS4ERR_DEADSESSION:
1168                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1169                 case -NFS4ERR_SEQ_FALSE_RETRY:
1170                 case -NFS4ERR_SEQ_MISORDERED:
1171                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1172                         /* Zero session reset errors */
1173                         return 0;
1174         }
1175         return error;
1176 }
1177
1178 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1179 {
1180         struct rb_node *pos;
1181         int status = 0;
1182
1183 restart:
1184         spin_lock(&clp->cl_lock);
1185         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1186                 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1187                 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1188                         continue;
1189                 atomic_inc(&sp->so_count);
1190                 spin_unlock(&clp->cl_lock);
1191                 status = nfs4_reclaim_open_state(sp, ops);
1192                 if (status < 0) {
1193                         set_bit(ops->owner_flag_bit, &sp->so_flags);
1194                         nfs4_put_state_owner(sp);
1195                         return nfs4_recovery_handle_error(clp, status);
1196                 }
1197                 nfs4_put_state_owner(sp);
1198                 goto restart;
1199         }
1200         spin_unlock(&clp->cl_lock);
1201         return status;
1202 }
1203
1204 static int nfs4_check_lease(struct nfs_client *clp)
1205 {
1206         struct rpc_cred *cred;
1207         struct nfs4_state_maintenance_ops *ops =
1208                 nfs4_state_renewal_ops[clp->cl_minorversion];
1209         int status = -NFS4ERR_EXPIRED;
1210
1211         /* Is the client already known to have an expired lease? */
1212         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1213                 return 0;
1214         spin_lock(&clp->cl_lock);
1215         cred = ops->get_state_renewal_cred_locked(clp);
1216         spin_unlock(&clp->cl_lock);
1217         if (cred == NULL) {
1218                 cred = nfs4_get_setclientid_cred(clp);
1219                 if (cred == NULL)
1220                         goto out;
1221         }
1222         status = ops->renew_lease(clp, cred);
1223         put_rpccred(cred);
1224 out:
1225         return nfs4_recovery_handle_error(clp, status);
1226 }
1227
1228 static int nfs4_reclaim_lease(struct nfs_client *clp)
1229 {
1230         struct rpc_cred *cred;
1231         struct nfs4_state_recovery_ops *ops =
1232                 nfs4_reboot_recovery_ops[clp->cl_minorversion];
1233         int status = -ENOENT;
1234
1235         cred = ops->get_clid_cred(clp);
1236         if (cred != NULL) {
1237                 status = ops->establish_clid(clp, cred);
1238                 put_rpccred(cred);
1239                 /* Handle case where the user hasn't set up machine creds */
1240                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1241                         nfs4_clear_machine_cred(clp);
1242                         status = -EAGAIN;
1243                 }
1244                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1245                         status = -EPROTONOSUPPORT;
1246         }
1247         return status;
1248 }
1249
1250 #ifdef CONFIG_NFS_V4_1
1251 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1252 {
1253         if (!flags)
1254                 return;
1255         else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) {
1256                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1257                 nfs4_state_start_reclaim_reboot(clp);
1258                 nfs4_schedule_state_recovery(clp);
1259         } else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1260                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1261                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1262                             SEQ4_STATUS_RECALLABLE_STATE_REVOKED |
1263                             SEQ4_STATUS_LEASE_MOVED)) {
1264                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1265                 nfs4_state_start_reclaim_nograce(clp);
1266                 nfs4_schedule_state_recovery(clp);
1267         } else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1268                             SEQ4_STATUS_BACKCHANNEL_FAULT |
1269                             SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1270                 nfs_expire_all_delegations(clp);
1271 }
1272
1273 static int nfs4_reset_session(struct nfs_client *clp)
1274 {
1275         int status;
1276
1277         status = nfs4_proc_destroy_session(clp->cl_session);
1278         if (status && status != -NFS4ERR_BADSESSION &&
1279             status != -NFS4ERR_DEADSESSION) {
1280                 status = nfs4_recovery_handle_error(clp, status);
1281                 goto out;
1282         }
1283
1284         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1285         status = nfs4_proc_create_session(clp);
1286         if (status)
1287                 status = nfs4_recovery_handle_error(clp, status);
1288
1289 out:
1290         /*
1291          * Let the state manager reestablish state
1292          */
1293         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1294             status == 0)
1295                 nfs41_setup_state_renewal(clp);
1296
1297         return status;
1298 }
1299
1300 #else /* CONFIG_NFS_V4_1 */
1301 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1302 static int nfs4_begin_drain_session(struct nfs_client *clp) { return 0; }
1303 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1304 #endif /* CONFIG_NFS_V4_1 */
1305
1306 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1307  * on EXCHANGE_ID for v4.1
1308  */
1309 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1310 {
1311         if (nfs4_has_session(clp)) {
1312                 switch (status) {
1313                 case -NFS4ERR_DELAY:
1314                 case -NFS4ERR_CLID_INUSE:
1315                 case -EAGAIN:
1316                         break;
1317
1318                 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1319                                          * in nfs4_exchange_id */
1320                 default:
1321                         return;
1322                 }
1323         }
1324         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1325 }
1326
1327 static void nfs4_state_manager(struct nfs_client *clp)
1328 {
1329         int status = 0;
1330
1331         /* Ensure exclusive access to NFSv4 state */
1332         for(;;) {
1333                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1334                         /* We're going to have to re-establish a clientid */
1335                         nfs4_begin_drain_session(clp);
1336                         status = nfs4_reclaim_lease(clp);
1337                         if (status) {
1338                                 nfs4_set_lease_expired(clp, status);
1339                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1340                                                         &clp->cl_state))
1341                                         continue;
1342                                 if (clp->cl_cons_state ==
1343                                                         NFS_CS_SESSION_INITING)
1344                                         nfs_mark_client_ready(clp, status);
1345                                 goto out_error;
1346                         }
1347                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1348                         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1349                 }
1350
1351                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1352                         status = nfs4_check_lease(clp);
1353                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1354                                 continue;
1355                         if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1356                                 goto out_error;
1357                 }
1358
1359                 /* Initialize or reset the session */
1360                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1361                    && nfs4_has_session(clp)) {
1362                         nfs4_begin_drain_session(clp);
1363                         status = nfs4_reset_session(clp);
1364                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1365                                 continue;
1366                         if (status < 0)
1367                                 goto out_error;
1368                 }
1369
1370                 /* First recover reboot state... */
1371                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1372                         status = nfs4_do_reclaim(clp,
1373                                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1374                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1375                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1376                                 continue;
1377                         nfs4_state_end_reclaim_reboot(clp);
1378                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1379                                 continue;
1380                         if (status < 0)
1381                                 goto out_error;
1382                 }
1383
1384                 /* Now recover expired state... */
1385                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1386                         status = nfs4_do_reclaim(clp,
1387                                 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
1388                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1389                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1390                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1391                                 continue;
1392                         if (status < 0)
1393                                 goto out_error;
1394                 }
1395
1396                 nfs4_end_drain_session(clp);
1397                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1398                         nfs_client_return_marked_delegations(clp);
1399                         continue;
1400                 }
1401
1402                 nfs4_clear_state_manager_bit(clp);
1403                 /* Did we race with an attempt to give us more work? */
1404                 if (clp->cl_state == 0)
1405                         break;
1406                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1407                         break;
1408         }
1409         return;
1410 out_error:
1411         printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1412                         " with error %d\n", clp->cl_hostname, -status);
1413         nfs4_end_drain_session(clp);
1414         nfs4_clear_state_manager_bit(clp);
1415 }
1416
1417 static int nfs4_run_state_manager(void *ptr)
1418 {
1419         struct nfs_client *clp = ptr;
1420
1421         allow_signal(SIGKILL);
1422         nfs4_state_manager(clp);
1423         nfs_put_client(clp);
1424         module_put_and_exit(0);
1425         return 0;
1426 }
1427
1428 /*
1429  * Local variables:
1430  *  c-basic-offset: 8
1431  * End:
1432  */