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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         struct nfs4_setclientid_res clid;
  66         unsigned short port;
  67         int status;
  68
  69         port = nfs_callback_tcpport;
  70         if (clp->cl_addr.ss_family == AF_INET6)
  71                 port = nfs_callback_tcpport6;
  72
  73         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
  74         if (status != 0)
  75                 goto out;
  76         status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
  77         if (status != 0)
  78                 goto out;
  79         clp->cl_clientid = clid.clientid;
  80         nfs4_schedule_state_renewal(clp);
  81 out:
  82         return status;
  83 }
  84
  85 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
  86 {
  87         struct rpc_cred *cred = NULL;
  88
  89         if (clp->cl_machine_cred != NULL)
  90                 cred = get_rpccred(clp->cl_machine_cred);
  91         return cred;
  92 }
  93
  94 static void nfs4_clear_machine_cred(struct nfs_client *clp)
  95 {
  96         struct rpc_cred *cred;
  97
  98         spin_lock(&clp->cl_lock);
  99         cred = clp->cl_machine_cred;
 100         clp->cl_machine_cred = NULL;
 101         spin_unlock(&clp->cl_lock);
 102         if (cred != NULL)
 103                 put_rpccred(cred);
 104 }
 105
 106 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 107 {
 108         struct nfs4_state_owner *sp;
 109         struct rb_node *pos;
 110         struct rpc_cred *cred = NULL;
 111
 112         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
 113                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 114                 if (list_empty(&sp->so_states))
 115                         continue;
 116                 cred = get_rpccred(sp->so_cred);
 117                 break;
 118         }
 119         return cred;
 120 }
 121
 122 #if defined(CONFIG_NFS_V4_1)
 123
 124 static int nfs41_setup_state_renewal(struct nfs_client *clp)
 125 {
 126         int status;
 127         struct nfs_fsinfo fsinfo;
 128
 129         status = nfs4_proc_get_lease_time(clp, &fsinfo);
 130         if (status == 0) {
 131                 /* Update lease time and schedule renewal */
 132                 spin_lock(&clp->cl_lock);
 133                 clp->cl_lease_time = fsinfo.lease_time * HZ;
 134                 clp->cl_last_renewal = jiffies;
 135                 spin_unlock(&clp->cl_lock);
 136
 137                 nfs4_schedule_state_renewal(clp);
 138         }
 139
 140         return status;
 141 }
 142
 143 static void nfs4_end_drain_session(struct nfs_client *clp)
 144 {
 145         struct nfs4_session *ses = clp->cl_session;
 146         int max_slots;
 147
 148         if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
 149                 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
 150                 max_slots = ses->fc_slot_table.max_slots;
 151                 while (max_slots--) {
 152                         struct rpc_task *task;
 153
 154                         task = rpc_wake_up_next(&ses->fc_slot_table.
 155                                                 slot_tbl_waitq);
 156                         if (!task)
 157                                 break;
 158                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 159                 }
 160                 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
 161         }
 162 }
 163
 164 static int nfs4_begin_drain_session(struct nfs_client *clp)
 165 {
 166         struct nfs4_session *ses = clp->cl_session;
 167         struct nfs4_slot_table *tbl = &ses->fc_slot_table;
 168
 169         spin_lock(&tbl->slot_tbl_lock);
 170         set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
 171         if (tbl->highest_used_slotid != -1) {
 172                 INIT_COMPLETION(ses->complete);
 173                 spin_unlock(&tbl->slot_tbl_lock);
 174                 return wait_for_completion_interruptible(&ses->complete);
 175         }
 176         spin_unlock(&tbl->slot_tbl_lock);
 177         return 0;
 178 }
 179
 180 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 181 {
 182         int status;
 183
 184         nfs4_begin_drain_session(clp);
 185         status = nfs4_proc_exchange_id(clp, cred);
 186         if (status != 0)
 187                 goto out;
 188         status = nfs4_proc_create_session(clp);
 189         if (status != 0)
 190                 goto out;
 191         nfs41_setup_state_renewal(clp);
 192         nfs_mark_client_ready(clp, NFS_CS_READY);
 193 out:
 194         return status;
 195 }
 196
 197 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 198 {
 199         struct rpc_cred *cred;
 200
 201         spin_lock(&clp->cl_lock);
 202         cred = nfs4_get_machine_cred_locked(clp);
 203         spin_unlock(&clp->cl_lock);
 204         return cred;
 205 }
 206
 207 #endif /* CONFIG_NFS_V4_1 */
 208
 209 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 210 {
 211         struct nfs4_state_owner *sp;
 212         struct rb_node *pos;
 213         struct rpc_cred *cred;
 214
 215         spin_lock(&clp->cl_lock);
 216         cred = nfs4_get_machine_cred_locked(clp);
 217         if (cred != NULL)
 218                 goto out;
 219         pos = rb_first(&clp->cl_state_owners);
 220         if (pos != NULL) {
 221                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 222                 cred = get_rpccred(sp->so_cred);
 223         }
 224 out:
 225         spin_unlock(&clp->cl_lock);
 226         return cred;
 227 }
 228
 229 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
 230                 __u64 minval, int maxbits)
 231 {
 232         struct rb_node **p, *parent;
 233         struct nfs_unique_id *pos;
 234         __u64 mask = ~0ULL;
 235
 236         if (maxbits < 64)
 237                 mask = (1ULL << maxbits) - 1ULL;
 238
 239         /* Ensure distribution is more or less flat */
 240         get_random_bytes(&new->id, sizeof(new->id));
 241         new->id &= mask;
 242         if (new->id < minval)
 243                 new->id += minval;
 244 retry:
 245         p = &root->rb_node;
 246         parent = NULL;
 247
 248         while (*p != NULL) {
 249                 parent = *p;
 250                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 251
 252                 if (new->id < pos->id)
 253                         p = &(*p)->rb_left;
 254                 else if (new->id > pos->id)
 255                         p = &(*p)->rb_right;
 256                 else
 257                         goto id_exists;
 258         }
 259         rb_link_node(&new->rb_node, parent, p);
 260         rb_insert_color(&new->rb_node, root);
 261         return;
 262 id_exists:
 263         for (;;) {
 264                 new->id++;
 265                 if (new->id < minval || (new->id & mask) != new->id) {
 266                         new->id = minval;
 267                         break;
 268                 }
 269                 parent = rb_next(parent);
 270                 if (parent == NULL)
 271                         break;
 272                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 273                 if (new->id < pos->id)
 274                         break;
 275         }
 276         goto retry;
 277 }
 278
 279 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 280 {
 281         rb_erase(&id->rb_node, root);
 282 }
 283
 284 static struct nfs4_state_owner *
 285 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 286 {
 287         struct nfs_client *clp = server->nfs_client;
 288         struct rb_node **p = &clp->cl_state_owners.rb_node,
 289                        *parent = NULL;
 290         struct nfs4_state_owner *sp, *res = NULL;
 291
 292         while (*p != NULL) {
 293                 parent = *p;
 294                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 295
 296                 if (server < sp->so_server) {
 297                         p = &parent->rb_left;
 298                         continue;
 299                 }
 300                 if (server > sp->so_server) {
 301                         p = &parent->rb_right;
 302                         continue;
 303                 }
 304                 if (cred < sp->so_cred)
 305                         p = &parent->rb_left;
 306                 else if (cred > sp->so_cred)
 307                         p = &parent->rb_right;
 308                 else {
 309                         atomic_inc(&sp->so_count);
 310                         res = sp;
 311                         break;
 312                 }
 313         }
 314         return res;
 315 }
 316
 317 static struct nfs4_state_owner *
 318 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
 319 {
 320         struct rb_node **p = &clp->cl_state_owners.rb_node,
 321                        *parent = NULL;
 322         struct nfs4_state_owner *sp;
 323
 324         while (*p != NULL) {
 325                 parent = *p;
 326                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 327
 328                 if (new->so_server < sp->so_server) {
 329                         p = &parent->rb_left;
 330                         continue;
 331                 }
 332                 if (new->so_server > sp->so_server) {
 333                         p = &parent->rb_right;
 334                         continue;
 335                 }
 336                 if (new->so_cred < sp->so_cred)
 337                         p = &parent->rb_left;
 338                 else if (new->so_cred > sp->so_cred)
 339                         p = &parent->rb_right;
 340                 else {
 341                         atomic_inc(&sp->so_count);
 342                         return sp;
 343                 }
 344         }
 345         nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
 346         rb_link_node(&new->so_client_node, parent, p);
 347         rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
 348         return new;
 349 }
 350
 351 static void
 352 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
 353 {
 354         if (!RB_EMPTY_NODE(&sp->so_client_node))
 355                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 356         nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
 357 }
 358
 359 /*
 360  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 361  * create a new state_owner.
 362  *
 363  */
 364 static struct nfs4_state_owner *
 365 nfs4_alloc_state_owner(void)
 366 {
 367         struct nfs4_state_owner *sp;
 368
 369         sp = kzalloc(sizeof(*sp),GFP_NOFS);
 370         if (!sp)
 371                 return NULL;
 372         spin_lock_init(&sp->so_lock);
 373         INIT_LIST_HEAD(&sp->so_states);
 374         INIT_LIST_HEAD(&sp->so_delegations);
 375         rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
 376         sp->so_seqid.sequence = &sp->so_sequence;
 377         spin_lock_init(&sp->so_sequence.lock);
 378         INIT_LIST_HEAD(&sp->so_sequence.list);
 379         atomic_set(&sp->so_count, 1);
 380         return sp;
 381 }
 382
 383 static void
 384 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 385 {
 386         if (!RB_EMPTY_NODE(&sp->so_client_node)) {
 387                 struct nfs_client *clp = sp->so_client;
 388
 389                 spin_lock(&clp->cl_lock);
 390                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 391                 RB_CLEAR_NODE(&sp->so_client_node);
 392                 spin_unlock(&clp->cl_lock);
 393         }
 394 }
 395
 396 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 397 {
 398         struct nfs_client *clp = server->nfs_client;
 399         struct nfs4_state_owner *sp, *new;
 400
 401         spin_lock(&clp->cl_lock);
 402         sp = nfs4_find_state_owner(server, cred);
 403         spin_unlock(&clp->cl_lock);
 404         if (sp != NULL)
 405                 return sp;
 406         new = nfs4_alloc_state_owner();
 407         if (new == NULL)
 408                 return NULL;
 409         new->so_client = clp;
 410         new->so_server = server;
 411         new->so_cred = cred;
 412         spin_lock(&clp->cl_lock);
 413         sp = nfs4_insert_state_owner(clp, new);
 414         spin_unlock(&clp->cl_lock);
 415         if (sp == new)
 416                 get_rpccred(cred);
 417         else {
 418                 rpc_destroy_wait_queue(&new->so_sequence.wait);
 419                 kfree(new);
 420         }
 421         return sp;
 422 }
 423
 424 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 425 {
 426         struct nfs_client *clp = sp->so_client;
 427         struct rpc_cred *cred = sp->so_cred;
 428
 429         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 430                 return;
 431         nfs4_remove_state_owner(clp, sp);
 432         spin_unlock(&clp->cl_lock);
 433         rpc_destroy_wait_queue(&sp->so_sequence.wait);
 434         put_rpccred(cred);
 435         kfree(sp);
 436 }
 437
 438 static struct nfs4_state *
 439 nfs4_alloc_open_state(void)
 440 {
 441         struct nfs4_state *state;
 442
 443         state = kzalloc(sizeof(*state), GFP_NOFS);
 444         if (!state)
 445                 return NULL;
 446         atomic_set(&state->count, 1);
 447         INIT_LIST_HEAD(&state->lock_states);
 448         spin_lock_init(&state->state_lock);
 449         seqlock_init(&state->seqlock);
 450         return state;
 451 }
 452
 453 void
 454 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 455 {
 456         if (state->state == fmode)
 457                 return;
 458         /* NB! List reordering - see the reclaim code for why.  */
 459         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 460                 if (fmode & FMODE_WRITE)
 461                         list_move(&state->open_states, &state->owner->so_states);
 462                 else
 463                         list_move_tail(&state->open_states, &state->owner->so_states);
 464         }
 465         state->state = fmode;
 466 }
 467
 468 static struct nfs4_state *
 469 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 470 {
 471         struct nfs_inode *nfsi = NFS_I(inode);
 472         struct nfs4_state *state;
 473
 474         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 475                 if (state->owner != owner)
 476                         continue;
 477                 if (atomic_inc_not_zero(&state->count))
 478                         return state;
 479         }
 480         return NULL;
 481 }
 482
 483 static void
 484 nfs4_free_open_state(struct nfs4_state *state)
 485 {
 486         kfree(state);
 487 }
 488
 489 struct nfs4_state *
 490 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 491 {
 492         struct nfs4_state *state, *new;
 493         struct nfs_inode *nfsi = NFS_I(inode);
 494
 495         spin_lock(&inode->i_lock);
 496         state = __nfs4_find_state_byowner(inode, owner);
 497         spin_unlock(&inode->i_lock);
 498         if (state)
 499                 goto out;
 500         new = nfs4_alloc_open_state();
 501         spin_lock(&owner->so_lock);
 502         spin_lock(&inode->i_lock);
 503         state = __nfs4_find_state_byowner(inode, owner);
 504         if (state == NULL && new != NULL) {
 505                 state = new;
 506                 state->owner = owner;
 507                 atomic_inc(&owner->so_count);
 508                 list_add(&state->inode_states, &nfsi->open_states);
 509                 state->inode = igrab(inode);
 510                 spin_unlock(&inode->i_lock);
 511                 /* Note: The reclaim code dictates that we add stateless
 512                  * and read-only stateids to the end of the list */
 513                 list_add_tail(&state->open_states, &owner->so_states);
 514                 spin_unlock(&owner->so_lock);
 515         } else {
 516                 spin_unlock(&inode->i_lock);
 517                 spin_unlock(&owner->so_lock);
 518                 if (new)
 519                         nfs4_free_open_state(new);
 520         }
 521 out:
 522         return state;
 523 }
 524
 525 void nfs4_put_open_state(struct nfs4_state *state)
 526 {
 527         struct inode *inode = state->inode;
 528         struct nfs4_state_owner *owner = state->owner;
 529
 530         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 531                 return;
 532         spin_lock(&inode->i_lock);
 533         list_del(&state->inode_states);
 534         list_del(&state->open_states);
 535         spin_unlock(&inode->i_lock);
 536         spin_unlock(&owner->so_lock);
 537         iput(inode);
 538         nfs4_free_open_state(state);
 539         nfs4_put_state_owner(owner);
 540 }
 541
 542 /*
 543  * Close the current file.
 544  */
 545 static void __nfs4_close(struct path *path, struct nfs4_state *state,
 546                 fmode_t fmode, gfp_t gfp_mask, int wait)
 547 {
 548         struct nfs4_state_owner *owner = state->owner;
 549         int call_close = 0;
 550         fmode_t newstate;
 551
 552         atomic_inc(&owner->so_count);
 553         /* Protect against nfs4_find_state() */
 554         spin_lock(&owner->so_lock);
 555         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 556                 case FMODE_READ:
 557                         state->n_rdonly--;
 558                         break;
 559                 case FMODE_WRITE:
 560                         state->n_wronly--;
 561                         break;
 562                 case FMODE_READ|FMODE_WRITE:
 563                         state->n_rdwr--;
 564         }
 565         newstate = FMODE_READ|FMODE_WRITE;
 566         if (state->n_rdwr == 0) {
 567                 if (state->n_rdonly == 0) {
 568                         newstate &= ~FMODE_READ;
 569                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 570                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 571                 }
 572                 if (state->n_wronly == 0) {
 573                         newstate &= ~FMODE_WRITE;
 574                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 575                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 576                 }
 577                 if (newstate == 0)
 578                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 579         }
 580         nfs4_state_set_mode_locked(state, newstate);
 581         spin_unlock(&owner->so_lock);
 582
 583         if (!call_close) {
 584                 nfs4_put_open_state(state);
 585                 nfs4_put_state_owner(owner);
 586         } else
 587                 nfs4_do_close(path, state, gfp_mask, wait);
 588 }
 589
 590 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
 591 {
 592         __nfs4_close(path, state, fmode, GFP_NOFS, 0);
 593 }
 594
 595 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
 596 {
 597         __nfs4_close(path, state, fmode, GFP_KERNEL, 1);
 598 }
 599
 600 /*
 601  * Search the state->lock_states for an existing lock_owner
 602  * that is compatible with current->files
 603  */
 604 static struct nfs4_lock_state *
 605 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 606 {
 607         struct nfs4_lock_state *pos;
 608         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 609                 if (pos->ls_owner != fl_owner)
 610                         continue;
 611                 atomic_inc(&pos->ls_count);
 612                 return pos;
 613         }
 614         return NULL;
 615 }
 616
 617 /*
 618  * Return a compatible lock_state. If no initialized lock_state structure
 619  * exists, return an uninitialized one.
 620  *
 621  */
 622 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
 623 {
 624         struct nfs4_lock_state *lsp;
 625         struct nfs_client *clp = state->owner->so_client;
 626
 627         lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
 628         if (lsp == NULL)
 629                 return NULL;
 630         rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
 631         spin_lock_init(&lsp->ls_sequence.lock);
 632         INIT_LIST_HEAD(&lsp->ls_sequence.list);
 633         lsp->ls_seqid.sequence = &lsp->ls_sequence;
 634         atomic_set(&lsp->ls_count, 1);
 635         lsp->ls_state = state;
 636         lsp->ls_owner = fl_owner;
 637         spin_lock(&clp->cl_lock);
 638         nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
 639         spin_unlock(&clp->cl_lock);
 640         INIT_LIST_HEAD(&lsp->ls_locks);
 641         return lsp;
 642 }
 643
 644 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 645 {
 646         struct nfs_client *clp = lsp->ls_state->owner->so_client;
 647
 648         spin_lock(&clp->cl_lock);
 649         nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
 650         spin_unlock(&clp->cl_lock);
 651         rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
 652         kfree(lsp);
 653 }
 654
 655 /*
 656  * Return a compatible lock_state. If no initialized lock_state structure
 657  * exists, return an uninitialized one.
 658  *
 659  */
 660 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
 661 {
 662         struct nfs4_lock_state *lsp, *new = NULL;
 663
 664         for(;;) {
 665                 spin_lock(&state->state_lock);
 666                 lsp = __nfs4_find_lock_state(state, owner);
 667                 if (lsp != NULL)
 668                         break;
 669                 if (new != NULL) {
 670                         list_add(&new->ls_locks, &state->lock_states);
 671                         set_bit(LK_STATE_IN_USE, &state->flags);
 672                         lsp = new;
 673                         new = NULL;
 674                         break;
 675                 }
 676                 spin_unlock(&state->state_lock);
 677                 new = nfs4_alloc_lock_state(state, owner);
 678                 if (new == NULL)
 679                         return NULL;
 680         }
 681         spin_unlock(&state->state_lock);
 682         if (new != NULL)
 683                 nfs4_free_lock_state(new);
 684         return lsp;
 685 }
 686
 687 /*
 688  * Release reference to lock_state, and free it if we see that
 689  * it is no longer in use
 690  */
 691 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 692 {
 693         struct nfs4_state *state;
 694
 695         if (lsp == NULL)
 696                 return;
 697         state = lsp->ls_state;
 698         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 699                 return;
 700         list_del(&lsp->ls_locks);
 701         if (list_empty(&state->lock_states))
 702                 clear_bit(LK_STATE_IN_USE, &state->flags);
 703         spin_unlock(&state->state_lock);
 704         nfs4_free_lock_state(lsp);
 705 }
 706
 707 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 708 {
 709         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 710
 711         dst->fl_u.nfs4_fl.owner = lsp;
 712         atomic_inc(&lsp->ls_count);
 713 }
 714
 715 static void nfs4_fl_release_lock(struct file_lock *fl)
 716 {
 717         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 718 }
 719
 720 static const struct file_lock_operations nfs4_fl_lock_ops = {
 721         .fl_copy_lock = nfs4_fl_copy_lock,
 722         .fl_release_private = nfs4_fl_release_lock,
 723 };
 724
 725 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 726 {
 727         struct nfs4_lock_state *lsp;
 728
 729         if (fl->fl_ops != NULL)
 730                 return 0;
 731         lsp = nfs4_get_lock_state(state, fl->fl_owner);
 732         if (lsp == NULL)
 733                 return -ENOMEM;
 734         fl->fl_u.nfs4_fl.owner = lsp;
 735         fl->fl_ops = &nfs4_fl_lock_ops;
 736         return 0;
 737 }
 738
 739 /*
 740  * Byte-range lock aware utility to initialize the stateid of read/write
 741  * requests.
 742  */
 743 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
 744 {
 745         struct nfs4_lock_state *lsp;
 746         int seq;
 747
 748         do {
 749                 seq = read_seqbegin(&state->seqlock);
 750                 memcpy(dst, &state->stateid, sizeof(*dst));
 751         } while (read_seqretry(&state->seqlock, seq));
 752         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 753                 return;
 754
 755         spin_lock(&state->state_lock);
 756         lsp = __nfs4_find_lock_state(state, fl_owner);
 757         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
 758                 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
 759         spin_unlock(&state->state_lock);
 760         nfs4_put_lock_state(lsp);
 761 }
 762
 763 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
 764 {
 765         struct nfs_seqid *new;
 766
 767         new = kmalloc(sizeof(*new), gfp_mask);
 768         if (new != NULL) {
 769                 new->sequence = counter;
 770                 INIT_LIST_HEAD(&new->list);
 771         }
 772         return new;
 773 }
 774
 775 void nfs_release_seqid(struct nfs_seqid *seqid)
 776 {
 777         if (!list_empty(&seqid->list)) {
 778                 struct rpc_sequence *sequence = seqid->sequence->sequence;
 779
 780                 spin_lock(&sequence->lock);
 781                 list_del_init(&seqid->list);
 782                 spin_unlock(&sequence->lock);
 783                 rpc_wake_up(&sequence->wait);
 784         }
 785 }
 786
 787 void nfs_free_seqid(struct nfs_seqid *seqid)
 788 {
 789         nfs_release_seqid(seqid);
 790         kfree(seqid);
 791 }
 792
 793 /*
 794  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 795  * failed with a seqid incrementing error -
 796  * see comments nfs_fs.h:seqid_mutating_error()
 797  */
 798 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 799 {
 800         BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
 801         switch (status) {
 802                 case 0:
 803                         break;
 804                 case -NFS4ERR_BAD_SEQID:
 805                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 806                                 return;
 807                         printk(KERN_WARNING "NFS: v4 server returned a bad"
 808                                         " sequence-id error on an"
 809                                         " unconfirmed sequence %p!\n",
 810                                         seqid->sequence);
 811                 case -NFS4ERR_STALE_CLIENTID:
 812                 case -NFS4ERR_STALE_STATEID:
 813                 case -NFS4ERR_BAD_STATEID:
 814                 case -NFS4ERR_BADXDR:
 815                 case -NFS4ERR_RESOURCE:
 816                 case -NFS4ERR_NOFILEHANDLE:
 817                         /* Non-seqid mutating errors */
 818                         return;
 819         };
 820         /*
 821          * Note: no locking needed as we are guaranteed to be first
 822          * on the sequence list
 823          */
 824         seqid->sequence->counter++;
 825 }
 826
 827 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
 828 {
 829         struct nfs4_state_owner *sp = container_of(seqid->sequence,
 830                                         struct nfs4_state_owner, so_seqid);
 831         struct nfs_server *server = sp->so_server;
 832
 833         if (status == -NFS4ERR_BAD_SEQID)
 834                 nfs4_drop_state_owner(sp);
 835         if (!nfs4_has_session(server->nfs_client))
 836                 nfs_increment_seqid(status, seqid);
 837 }
 838
 839 /*
 840  * Increment the seqid if the LOCK/LOCKU succeeded, or
 841  * failed with a seqid incrementing error -
 842  * see comments nfs_fs.h:seqid_mutating_error()
 843  */
 844 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
 845 {
 846         nfs_increment_seqid(status, seqid);
 847 }
 848
 849 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
 850 {
 851         struct rpc_sequence *sequence = seqid->sequence->sequence;
 852         int status = 0;
 853
 854         spin_lock(&sequence->lock);
 855         if (list_empty(&seqid->list))
 856                 list_add_tail(&seqid->list, &sequence->list);
 857         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
 858                 goto unlock;
 859         rpc_sleep_on(&sequence->wait, task, NULL);
 860         status = -EAGAIN;
 861 unlock:
 862         spin_unlock(&sequence->lock);
 863         return status;
 864 }
 865
 866 static int nfs4_run_state_manager(void *);
 867
 868 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
 869 {
 870         smp_mb__before_clear_bit();
 871         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 872         smp_mb__after_clear_bit();
 873         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
 874         rpc_wake_up(&clp->cl_rpcwaitq);
 875 }
 876
 877 /*
 878  * Schedule the nfs_client asynchronous state management routine
 879  */
 880 void nfs4_schedule_state_manager(struct nfs_client *clp)
 881 {
 882         struct task_struct *task;
 883
 884         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
 885                 return;
 886         __module_get(THIS_MODULE);
 887         atomic_inc(&clp->cl_count);
 888         task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
 889                                 rpc_peeraddr2str(clp->cl_rpcclient,
 890                                                         RPC_DISPLAY_ADDR));
 891         if (!IS_ERR(task))
 892                 return;
 893         nfs4_clear_state_manager_bit(clp);
 894         nfs_put_client(clp);
 895         module_put(THIS_MODULE);
 896 }
 897
 898 /*
 899  * Schedule a state recovery attempt
 900  */
 901 void nfs4_schedule_state_recovery(struct nfs_client *clp)
 902 {
 903         if (!clp)
 904                 return;
 905         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 906                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
 907         nfs4_schedule_state_manager(clp);
 908 }
 909
 910 int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
 911 {
 912
 913         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 914         /* Don't recover state that expired before the reboot */
 915         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
 916                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 917                 return 0;
 918         }
 919         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
 920         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
 921         return 1;
 922 }
 923
 924 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
 925 {
 926         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
 927         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 928         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
 929         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
 930         return 1;
 931 }
 932
 933 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
 934 {
 935         struct inode *inode = state->inode;
 936         struct nfs_inode *nfsi = NFS_I(inode);
 937         struct file_lock *fl;
 938         int status = 0;
 939
 940         if (inode->i_flock == NULL)
 941                 return 0;
 942
 943         /* Guard against delegation returns and new lock/unlock calls */
 944         down_write(&nfsi->rwsem);
 945         /* Protect inode->i_flock using the BKL */
 946         lock_kernel();
 947         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
 948                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 949                         continue;
 950                 if (nfs_file_open_context(fl->fl_file)->state != state)
 951                         continue;
 952                 unlock_kernel();
 953                 status = ops->recover_lock(state, fl);
 954                 switch (status) {
 955                         case 0:
 956                                 break;
 957                         case -ESTALE:
 958                         case -NFS4ERR_ADMIN_REVOKED:
 959                         case -NFS4ERR_STALE_STATEID:
 960                         case -NFS4ERR_BAD_STATEID:
 961                         case -NFS4ERR_EXPIRED:
 962                         case -NFS4ERR_NO_GRACE:
 963                         case -NFS4ERR_STALE_CLIENTID:
 964                         case -NFS4ERR_BADSESSION:
 965                         case -NFS4ERR_BADSLOT:
 966                         case -NFS4ERR_BAD_HIGH_SLOT:
 967                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 968                                 goto out;
 969                         default:
 970                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
 971                                                 __func__, status);
 972                         case -ENOMEM:
 973                         case -NFS4ERR_DENIED:
 974                         case -NFS4ERR_RECLAIM_BAD:
 975                         case -NFS4ERR_RECLAIM_CONFLICT:
 976                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
 977                                 status = 0;
 978                 }
 979                 lock_kernel();
 980         }
 981         unlock_kernel();
 982 out:
 983         up_write(&nfsi->rwsem);
 984         return status;
 985 }
 986
 987 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
 988 {
 989         struct nfs4_state *state;
 990         struct nfs4_lock_state *lock;
 991         int status = 0;
 992
 993         /* Note: we rely on the sp->so_states list being ordered
 994          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
 995          * states first.
 996          * This is needed to ensure that the server won't give us any
 997          * read delegations that we have to return if, say, we are
 998          * recovering after a network partition or a reboot from a
 999          * server that doesn't support a grace period.
1000          */
1001 restart:
1002         spin_lock(&sp->so_lock);
1003         list_for_each_entry(state, &sp->so_states, open_states) {
1004                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1005                         continue;
1006                 if (state->state == 0)
1007                         continue;
1008                 atomic_inc(&state->count);
1009                 spin_unlock(&sp->so_lock);
1010                 status = ops->recover_open(sp, state);
1011                 if (status >= 0) {
1012                         status = nfs4_reclaim_locks(state, ops);
1013                         if (status >= 0) {
1014                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1015                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1016                                                 printk("%s: Lock reclaim failed!\n",
1017                                                         __func__);
1018                                 }
1019                                 nfs4_put_open_state(state);
1020                                 goto restart;
1021                         }
1022                 }
1023                 switch (status) {
1024                         default:
1025                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1026                                                 __func__, status);
1027                         case -ENOENT:
1028                         case -ENOMEM:
1029                         case -ESTALE:
1030                                 /*
1031                                  * Open state on this file cannot be recovered
1032                                  * All we can do is revert to using the zero stateid.
1033                                  */
1034                                 memset(state->stateid.data, 0,
1035                                         sizeof(state->stateid.data));
1036                                 /* Mark the file as being 'closed' */
1037                                 state->state = 0;
1038                                 break;
1039                         case -NFS4ERR_ADMIN_REVOKED:
1040                         case -NFS4ERR_STALE_STATEID:
1041                         case -NFS4ERR_BAD_STATEID:
1042                         case -NFS4ERR_RECLAIM_BAD:
1043                         case -NFS4ERR_RECLAIM_CONFLICT:
1044                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
1045                                 break;
1046                         case -NFS4ERR_EXPIRED:
1047                         case -NFS4ERR_NO_GRACE:
1048                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
1049                         case -NFS4ERR_STALE_CLIENTID:
1050                         case -NFS4ERR_BADSESSION:
1051                         case -NFS4ERR_BADSLOT:
1052                         case -NFS4ERR_BAD_HIGH_SLOT:
1053                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1054                                 goto out_err;
1055                 }
1056                 nfs4_put_open_state(state);
1057                 goto restart;
1058         }
1059         spin_unlock(&sp->so_lock);
1060         return 0;
1061 out_err:
1062         nfs4_put_open_state(state);
1063         return status;
1064 }
1065
1066 static void nfs4_clear_open_state(struct nfs4_state *state)
1067 {
1068         struct nfs4_lock_state *lock;
1069
1070         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1071         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1072         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1073         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1074         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1075                 lock->ls_seqid.flags = 0;
1076                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1077         }
1078 }
1079
1080 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1081 {
1082         struct nfs4_state_owner *sp;
1083         struct rb_node *pos;
1084         struct nfs4_state *state;
1085
1086         /* Reset all sequence ids to zero */
1087         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1088                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1089                 sp->so_seqid.flags = 0;
1090                 spin_lock(&sp->so_lock);
1091                 list_for_each_entry(state, &sp->so_states, open_states) {
1092                         if (mark_reclaim(clp, state))
1093                                 nfs4_clear_open_state(state);
1094                 }
1095                 spin_unlock(&sp->so_lock);
1096         }
1097 }
1098
1099 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1100 {
1101         /* Mark all delegations for reclaim */
1102         nfs_delegation_mark_reclaim(clp);
1103         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1104 }
1105
1106 static void nfs4_reclaim_complete(struct nfs_client *clp,
1107                                  const struct nfs4_state_recovery_ops *ops)
1108 {
1109         /* Notify the server we're done reclaiming our state */
1110         if (ops->reclaim_complete)
1111                 (void)ops->reclaim_complete(clp);
1112 }
1113
1114 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1115 {
1116         struct nfs4_state_owner *sp;
1117         struct rb_node *pos;
1118         struct nfs4_state *state;
1119
1120         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1121                 return;
1122
1123         nfs4_reclaim_complete(clp,
1124                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1125
1126         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1127                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1128                 spin_lock(&sp->so_lock);
1129                 list_for_each_entry(state, &sp->so_states, open_states) {
1130                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1131                                 continue;
1132                         nfs4_state_mark_reclaim_nograce(clp, state);
1133                 }
1134                 spin_unlock(&sp->so_lock);
1135         }
1136
1137         nfs_delegation_reap_unclaimed(clp);
1138 }
1139
1140 static void nfs_delegation_clear_all(struct nfs_client *clp)
1141 {
1142         nfs_delegation_mark_reclaim(clp);
1143         nfs_delegation_reap_unclaimed(clp);
1144 }
1145
1146 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1147 {
1148         nfs_delegation_clear_all(clp);
1149         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1150 }
1151
1152 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1153 {
1154         switch (error) {
1155                 case -NFS4ERR_CB_PATH_DOWN:
1156                         nfs_handle_cb_pathdown(clp);
1157                         return 0;
1158                 case -NFS4ERR_NO_GRACE:
1159                         nfs4_state_end_reclaim_reboot(clp);
1160                         return 0;
1161                 case -NFS4ERR_STALE_CLIENTID:
1162                 case -NFS4ERR_LEASE_MOVED:
1163                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1164                         nfs4_state_end_reclaim_reboot(clp);
1165                         nfs4_state_start_reclaim_reboot(clp);
1166                         break;
1167                 case -NFS4ERR_EXPIRED:
1168                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1169                         nfs4_state_start_reclaim_nograce(clp);
1170                         break;
1171                 case -NFS4ERR_BADSESSION:
1172                 case -NFS4ERR_BADSLOT:
1173                 case -NFS4ERR_BAD_HIGH_SLOT:
1174                 case -NFS4ERR_DEADSESSION:
1175                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1176                 case -NFS4ERR_SEQ_FALSE_RETRY:
1177                 case -NFS4ERR_SEQ_MISORDERED:
1178                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1179                         /* Zero session reset errors */
1180                         return 0;
1181         }
1182         return error;
1183 }
1184
1185 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1186 {
1187         struct rb_node *pos;
1188         int status = 0;
1189
1190 restart:
1191         spin_lock(&clp->cl_lock);
1192         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1193                 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1194                 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1195                         continue;
1196                 atomic_inc(&sp->so_count);
1197                 spin_unlock(&clp->cl_lock);
1198                 status = nfs4_reclaim_open_state(sp, ops);
1199                 if (status < 0) {
1200                         set_bit(ops->owner_flag_bit, &sp->so_flags);
1201                         nfs4_put_state_owner(sp);
1202                         return nfs4_recovery_handle_error(clp, status);
1203                 }
1204                 nfs4_put_state_owner(sp);
1205                 goto restart;
1206         }
1207         spin_unlock(&clp->cl_lock);
1208         return status;
1209 }
1210
1211 static int nfs4_check_lease(struct nfs_client *clp)
1212 {
1213         struct rpc_cred *cred;
1214         struct nfs4_state_maintenance_ops *ops =
1215                 nfs4_state_renewal_ops[clp->cl_minorversion];
1216         int status = -NFS4ERR_EXPIRED;
1217
1218         /* Is the client already known to have an expired lease? */
1219         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1220                 return 0;
1221         spin_lock(&clp->cl_lock);
1222         cred = ops->get_state_renewal_cred_locked(clp);
1223         spin_unlock(&clp->cl_lock);
1224         if (cred == NULL) {
1225                 cred = nfs4_get_setclientid_cred(clp);
1226                 if (cred == NULL)
1227                         goto out;
1228         }
1229         status = ops->renew_lease(clp, cred);
1230         put_rpccred(cred);
1231 out:
1232         return nfs4_recovery_handle_error(clp, status);
1233 }
1234
1235 static int nfs4_reclaim_lease(struct nfs_client *clp)
1236 {
1237         struct rpc_cred *cred;
1238         struct nfs4_state_recovery_ops *ops =
1239                 nfs4_reboot_recovery_ops[clp->cl_minorversion];
1240         int status = -ENOENT;
1241
1242         cred = ops->get_clid_cred(clp);
1243         if (cred != NULL) {
1244                 status = ops->establish_clid(clp, cred);
1245                 put_rpccred(cred);
1246                 /* Handle case where the user hasn't set up machine creds */
1247                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1248                         nfs4_clear_machine_cred(clp);
1249                         status = -EAGAIN;
1250                 }
1251                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1252                         status = -EPROTONOSUPPORT;
1253         }
1254         return status;
1255 }
1256
1257 #ifdef CONFIG_NFS_V4_1
1258 void nfs41_handle_recall_slot(struct nfs_client *clp)
1259 {
1260         set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1261         nfs4_schedule_state_recovery(clp);
1262 }
1263
1264 static void nfs4_reset_all_state(struct nfs_client *clp)
1265 {
1266         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1267                 clp->cl_boot_time = CURRENT_TIME;
1268                 nfs4_state_start_reclaim_nograce(clp);
1269                 nfs4_schedule_state_recovery(clp);
1270         }
1271 }
1272
1273 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1274 {
1275         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1276                 nfs4_state_start_reclaim_reboot(clp);
1277                 nfs4_schedule_state_recovery(clp);
1278         }
1279 }
1280
1281 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1282 {
1283         /* Temporary */
1284         nfs4_reset_all_state(clp);
1285 }
1286
1287 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1288 {
1289         /* This will need to handle layouts too */
1290         nfs_expire_all_delegations(clp);
1291 }
1292
1293 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1294 {
1295         nfs_expire_all_delegations(clp);
1296         if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1297                 nfs4_schedule_state_recovery(clp);
1298 }
1299
1300 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1301 {
1302         if (!flags)
1303                 return;
1304         else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1305                 nfs41_handle_server_reboot(clp);
1306         else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1307                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1308                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1309                             SEQ4_STATUS_LEASE_MOVED))
1310                 nfs41_handle_state_revoked(clp);
1311         else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1312                 nfs41_handle_recallable_state_revoked(clp);
1313         else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1314                             SEQ4_STATUS_BACKCHANNEL_FAULT |
1315                             SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1316                 nfs41_handle_cb_path_down(clp);
1317 }
1318
1319 static int nfs4_reset_session(struct nfs_client *clp)
1320 {
1321         int status;
1322
1323         nfs4_begin_drain_session(clp);
1324         status = nfs4_proc_destroy_session(clp->cl_session);
1325         if (status && status != -NFS4ERR_BADSESSION &&
1326             status != -NFS4ERR_DEADSESSION) {
1327                 status = nfs4_recovery_handle_error(clp, status);
1328                 goto out;
1329         }
1330
1331         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1332         status = nfs4_proc_create_session(clp);
1333         if (status) {
1334                 status = nfs4_recovery_handle_error(clp, status);
1335                 goto out;
1336         }
1337         /* create_session negotiated new slot table */
1338         clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1339
1340          /* Let the state manager reestablish state */
1341         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1342                 nfs41_setup_state_renewal(clp);
1343 out:
1344         return status;
1345 }
1346
1347 static int nfs4_recall_slot(struct nfs_client *clp)
1348 {
1349         struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1350         struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1351         struct nfs4_slot *new, *old;
1352         int i;
1353
1354         nfs4_begin_drain_session(clp);
1355         new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1356                       GFP_NOFS);
1357         if (!new)
1358                 return -ENOMEM;
1359
1360         spin_lock(&fc_tbl->slot_tbl_lock);
1361         for (i = 0; i < fc_tbl->target_max_slots; i++)
1362                 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1363         old = fc_tbl->slots;
1364         fc_tbl->slots = new;
1365         fc_tbl->max_slots = fc_tbl->target_max_slots;
1366         fc_tbl->target_max_slots = 0;
1367         fc_attrs->max_reqs = fc_tbl->max_slots;
1368         spin_unlock(&fc_tbl->slot_tbl_lock);
1369
1370         kfree(old);
1371         nfs4_end_drain_session(clp);
1372         return 0;
1373 }
1374
1375 #else /* CONFIG_NFS_V4_1 */
1376 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1377 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1378 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1379 #endif /* CONFIG_NFS_V4_1 */
1380
1381 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1382  * on EXCHANGE_ID for v4.1
1383  */
1384 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1385 {
1386         if (nfs4_has_session(clp)) {
1387                 switch (status) {
1388                 case -NFS4ERR_DELAY:
1389                 case -NFS4ERR_CLID_INUSE:
1390                 case -EAGAIN:
1391                 case -EKEYEXPIRED:
1392                         break;
1393
1394                 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1395                                          * in nfs4_exchange_id */
1396                 default:
1397                         return;
1398                 }
1399         }
1400         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1401 }
1402
1403 static void nfs4_state_manager(struct nfs_client *clp)
1404 {
1405         int status = 0;
1406
1407         /* Ensure exclusive access to NFSv4 state */
1408         for(;;) {
1409                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1410                         /* We're going to have to re-establish a clientid */
1411                         status = nfs4_reclaim_lease(clp);
1412                         if (status) {
1413                                 nfs4_set_lease_expired(clp, status);
1414                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1415                                                         &clp->cl_state))
1416                                         continue;
1417                                 if (clp->cl_cons_state ==
1418                                                         NFS_CS_SESSION_INITING)
1419                                         nfs_mark_client_ready(clp, status);
1420                                 goto out_error;
1421                         }
1422                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1423                         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1424                 }
1425
1426                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1427                         status = nfs4_check_lease(clp);
1428                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1429                                 continue;
1430                         if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1431                                 goto out_error;
1432                 }
1433
1434                 /* Initialize or reset the session */
1435                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1436                    && nfs4_has_session(clp)) {
1437                         status = nfs4_reset_session(clp);
1438                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1439                                 continue;
1440                         if (status < 0)
1441                                 goto out_error;
1442                 }
1443
1444                 /* First recover reboot state... */
1445                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1446                         status = nfs4_do_reclaim(clp,
1447                                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1448                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1449                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1450                                 continue;
1451                         nfs4_state_end_reclaim_reboot(clp);
1452                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1453                                 continue;
1454                         if (status < 0)
1455                                 goto out_error;
1456                 }
1457
1458                 /* Now recover expired state... */
1459                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1460                         status = nfs4_do_reclaim(clp,
1461                                 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
1462                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1463                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1464                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1465                                 continue;
1466                         if (status < 0)
1467                                 goto out_error;
1468                 }
1469
1470                 nfs4_end_drain_session(clp);
1471                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1472                         nfs_client_return_marked_delegations(clp);
1473                         continue;
1474                 }
1475                 /* Recall session slots */
1476                 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1477                    && nfs4_has_session(clp)) {
1478                         status = nfs4_recall_slot(clp);
1479                         if (status < 0)
1480                                 goto out_error;
1481                         continue;
1482                 }
1483
1484
1485                 nfs4_clear_state_manager_bit(clp);
1486                 /* Did we race with an attempt to give us more work? */
1487                 if (clp->cl_state == 0)
1488                         break;
1489                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1490                         break;
1491         }
1492         return;
1493 out_error:
1494         printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1495                         " with error %d\n", clp->cl_hostname, -status);
1496         nfs4_end_drain_session(clp);
1497         nfs4_clear_state_manager_bit(clp);
1498 }
1499
1500 static int nfs4_run_state_manager(void *ptr)
1501 {
1502         struct nfs_client *clp = ptr;
1503
1504         allow_signal(SIGKILL);
1505         nfs4_state_manager(clp);
1506         nfs_put_client(clp);
1507         module_put_and_exit(0);
1508         return 0;
1509 }
1510
1511 /*
1512  * Local variables:
1513  *  c-basic-offset: 8
1514  * End:
1515  */