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         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 (ses == NULL)
 149                 return;
 150         if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 151                 spin_lock(&ses->fc_slot_table.slot_tbl_lock);
 152                 max_slots = ses->fc_slot_table.max_slots;
 153                 while (max_slots--) {
 154                         struct rpc_task *task;
 155
 156                         task = rpc_wake_up_next(&ses->fc_slot_table.
 157                                                 slot_tbl_waitq);
 158                         if (!task)
 159                                 break;
 160                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 161                 }
 162                 spin_unlock(&ses->fc_slot_table.slot_tbl_lock);
 163         }
 164 }
 165
 166 static int nfs4_begin_drain_session(struct nfs_client *clp)
 167 {
 168         struct nfs4_session *ses = clp->cl_session;
 169         struct nfs4_slot_table *tbl = &ses->fc_slot_table;
 170
 171         spin_lock(&tbl->slot_tbl_lock);
 172         set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
 173         if (tbl->highest_used_slotid != -1) {
 174                 INIT_COMPLETION(ses->complete);
 175                 spin_unlock(&tbl->slot_tbl_lock);
 176                 return wait_for_completion_interruptible(&ses->complete);
 177         }
 178         spin_unlock(&tbl->slot_tbl_lock);
 179         return 0;
 180 }
 181
 182 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 183 {
 184         int status;
 185
 186         nfs4_begin_drain_session(clp);
 187         status = nfs4_proc_exchange_id(clp, cred);
 188         if (status != 0)
 189                 goto out;
 190         status = nfs4_proc_create_session(clp);
 191         if (status != 0)
 192                 goto out;
 193         nfs41_setup_state_renewal(clp);
 194         nfs_mark_client_ready(clp, NFS_CS_READY);
 195 out:
 196         return status;
 197 }
 198
 199 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 200 {
 201         struct rpc_cred *cred;
 202
 203         spin_lock(&clp->cl_lock);
 204         cred = nfs4_get_machine_cred_locked(clp);
 205         spin_unlock(&clp->cl_lock);
 206         return cred;
 207 }
 208
 209 #endif /* CONFIG_NFS_V4_1 */
 210
 211 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 212 {
 213         struct nfs4_state_owner *sp;
 214         struct rb_node *pos;
 215         struct rpc_cred *cred;
 216
 217         spin_lock(&clp->cl_lock);
 218         cred = nfs4_get_machine_cred_locked(clp);
 219         if (cred != NULL)
 220                 goto out;
 221         pos = rb_first(&clp->cl_state_owners);
 222         if (pos != NULL) {
 223                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
 224                 cred = get_rpccred(sp->so_cred);
 225         }
 226 out:
 227         spin_unlock(&clp->cl_lock);
 228         return cred;
 229 }
 230
 231 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
 232                 __u64 minval, int maxbits)
 233 {
 234         struct rb_node **p, *parent;
 235         struct nfs_unique_id *pos;
 236         __u64 mask = ~0ULL;
 237
 238         if (maxbits < 64)
 239                 mask = (1ULL << maxbits) - 1ULL;
 240
 241         /* Ensure distribution is more or less flat */
 242         get_random_bytes(&new->id, sizeof(new->id));
 243         new->id &= mask;
 244         if (new->id < minval)
 245                 new->id += minval;
 246 retry:
 247         p = &root->rb_node;
 248         parent = NULL;
 249
 250         while (*p != NULL) {
 251                 parent = *p;
 252                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 253
 254                 if (new->id < pos->id)
 255                         p = &(*p)->rb_left;
 256                 else if (new->id > pos->id)
 257                         p = &(*p)->rb_right;
 258                 else
 259                         goto id_exists;
 260         }
 261         rb_link_node(&new->rb_node, parent, p);
 262         rb_insert_color(&new->rb_node, root);
 263         return;
 264 id_exists:
 265         for (;;) {
 266                 new->id++;
 267                 if (new->id < minval || (new->id & mask) != new->id) {
 268                         new->id = minval;
 269                         break;
 270                 }
 271                 parent = rb_next(parent);
 272                 if (parent == NULL)
 273                         break;
 274                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
 275                 if (new->id < pos->id)
 276                         break;
 277         }
 278         goto retry;
 279 }
 280
 281 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
 282 {
 283         rb_erase(&id->rb_node, root);
 284 }
 285
 286 static struct nfs4_state_owner *
 287 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 288 {
 289         struct nfs_client *clp = server->nfs_client;
 290         struct rb_node **p = &clp->cl_state_owners.rb_node,
 291                        *parent = NULL;
 292         struct nfs4_state_owner *sp, *res = NULL;
 293
 294         while (*p != NULL) {
 295                 parent = *p;
 296                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 297
 298                 if (server < sp->so_server) {
 299                         p = &parent->rb_left;
 300                         continue;
 301                 }
 302                 if (server > sp->so_server) {
 303                         p = &parent->rb_right;
 304                         continue;
 305                 }
 306                 if (cred < sp->so_cred)
 307                         p = &parent->rb_left;
 308                 else if (cred > sp->so_cred)
 309                         p = &parent->rb_right;
 310                 else {
 311                         atomic_inc(&sp->so_count);
 312                         res = sp;
 313                         break;
 314                 }
 315         }
 316         return res;
 317 }
 318
 319 static struct nfs4_state_owner *
 320 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
 321 {
 322         struct rb_node **p = &clp->cl_state_owners.rb_node,
 323                        *parent = NULL;
 324         struct nfs4_state_owner *sp;
 325
 326         while (*p != NULL) {
 327                 parent = *p;
 328                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
 329
 330                 if (new->so_server < sp->so_server) {
 331                         p = &parent->rb_left;
 332                         continue;
 333                 }
 334                 if (new->so_server > sp->so_server) {
 335                         p = &parent->rb_right;
 336                         continue;
 337                 }
 338                 if (new->so_cred < sp->so_cred)
 339                         p = &parent->rb_left;
 340                 else if (new->so_cred > sp->so_cred)
 341                         p = &parent->rb_right;
 342                 else {
 343                         atomic_inc(&sp->so_count);
 344                         return sp;
 345                 }
 346         }
 347         nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
 348         rb_link_node(&new->so_client_node, parent, p);
 349         rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
 350         return new;
 351 }
 352
 353 static void
 354 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
 355 {
 356         if (!RB_EMPTY_NODE(&sp->so_client_node))
 357                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 358         nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
 359 }
 360
 361 /*
 362  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 363  * create a new state_owner.
 364  *
 365  */
 366 static struct nfs4_state_owner *
 367 nfs4_alloc_state_owner(void)
 368 {
 369         struct nfs4_state_owner *sp;
 370
 371         sp = kzalloc(sizeof(*sp),GFP_NOFS);
 372         if (!sp)
 373                 return NULL;
 374         spin_lock_init(&sp->so_lock);
 375         INIT_LIST_HEAD(&sp->so_states);
 376         rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
 377         sp->so_seqid.sequence = &sp->so_sequence;
 378         spin_lock_init(&sp->so_sequence.lock);
 379         INIT_LIST_HEAD(&sp->so_sequence.list);
 380         atomic_set(&sp->so_count, 1);
 381         return sp;
 382 }
 383
 384 static void
 385 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 386 {
 387         if (!RB_EMPTY_NODE(&sp->so_client_node)) {
 388                 struct nfs_client *clp = sp->so_server->nfs_client;
 389
 390                 spin_lock(&clp->cl_lock);
 391                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
 392                 RB_CLEAR_NODE(&sp->so_client_node);
 393                 spin_unlock(&clp->cl_lock);
 394         }
 395 }
 396
 397 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
 398 {
 399         struct nfs_client *clp = server->nfs_client;
 400         struct nfs4_state_owner *sp, *new;
 401
 402         spin_lock(&clp->cl_lock);
 403         sp = nfs4_find_state_owner(server, cred);
 404         spin_unlock(&clp->cl_lock);
 405         if (sp != NULL)
 406                 return sp;
 407         new = nfs4_alloc_state_owner();
 408         if (new == NULL)
 409                 return NULL;
 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_server->nfs_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_server->nfs_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_server->nfs_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         if (lsp->ls_flags & NFS_LOCK_INITIALIZED)
 705                 nfs4_release_lockowner(lsp);
 706         nfs4_free_lock_state(lsp);
 707 }
 708
 709 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 710 {
 711         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 712
 713         dst->fl_u.nfs4_fl.owner = lsp;
 714         atomic_inc(&lsp->ls_count);
 715 }
 716
 717 static void nfs4_fl_release_lock(struct file_lock *fl)
 718 {
 719         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 720 }
 721
 722 static const struct file_lock_operations nfs4_fl_lock_ops = {
 723         .fl_copy_lock = nfs4_fl_copy_lock,
 724         .fl_release_private = nfs4_fl_release_lock,
 725 };
 726
 727 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 728 {
 729         struct nfs4_lock_state *lsp;
 730
 731         if (fl->fl_ops != NULL)
 732                 return 0;
 733         lsp = nfs4_get_lock_state(state, fl->fl_owner);
 734         if (lsp == NULL)
 735                 return -ENOMEM;
 736         fl->fl_u.nfs4_fl.owner = lsp;
 737         fl->fl_ops = &nfs4_fl_lock_ops;
 738         return 0;
 739 }
 740
 741 /*
 742  * Byte-range lock aware utility to initialize the stateid of read/write
 743  * requests.
 744  */
 745 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
 746 {
 747         struct nfs4_lock_state *lsp;
 748         int seq;
 749
 750         do {
 751                 seq = read_seqbegin(&state->seqlock);
 752                 memcpy(dst, &state->stateid, sizeof(*dst));
 753         } while (read_seqretry(&state->seqlock, seq));
 754         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 755                 return;
 756
 757         spin_lock(&state->state_lock);
 758         lsp = __nfs4_find_lock_state(state, fl_owner);
 759         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
 760                 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
 761         spin_unlock(&state->state_lock);
 762         nfs4_put_lock_state(lsp);
 763 }
 764
 765 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
 766 {
 767         struct nfs_seqid *new;
 768
 769         new = kmalloc(sizeof(*new), gfp_mask);
 770         if (new != NULL) {
 771                 new->sequence = counter;
 772                 INIT_LIST_HEAD(&new->list);
 773         }
 774         return new;
 775 }
 776
 777 void nfs_release_seqid(struct nfs_seqid *seqid)
 778 {
 779         if (!list_empty(&seqid->list)) {
 780                 struct rpc_sequence *sequence = seqid->sequence->sequence;
 781
 782                 spin_lock(&sequence->lock);
 783                 list_del_init(&seqid->list);
 784                 spin_unlock(&sequence->lock);
 785                 rpc_wake_up(&sequence->wait);
 786         }
 787 }
 788
 789 void nfs_free_seqid(struct nfs_seqid *seqid)
 790 {
 791         nfs_release_seqid(seqid);
 792         kfree(seqid);
 793 }
 794
 795 /*
 796  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 797  * failed with a seqid incrementing error -
 798  * see comments nfs_fs.h:seqid_mutating_error()
 799  */
 800 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 801 {
 802         BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
 803         switch (status) {
 804                 case 0:
 805                         break;
 806                 case -NFS4ERR_BAD_SEQID:
 807                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 808                                 return;
 809                         printk(KERN_WARNING "NFS: v4 server returned a bad"
 810                                         " sequence-id error on an"
 811                                         " unconfirmed sequence %p!\n",
 812                                         seqid->sequence);
 813                 case -NFS4ERR_STALE_CLIENTID:
 814                 case -NFS4ERR_STALE_STATEID:
 815                 case -NFS4ERR_BAD_STATEID:
 816                 case -NFS4ERR_BADXDR:
 817                 case -NFS4ERR_RESOURCE:
 818                 case -NFS4ERR_NOFILEHANDLE:
 819                         /* Non-seqid mutating errors */
 820                         return;
 821         };
 822         /*
 823          * Note: no locking needed as we are guaranteed to be first
 824          * on the sequence list
 825          */
 826         seqid->sequence->counter++;
 827 }
 828
 829 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
 830 {
 831         struct nfs4_state_owner *sp = container_of(seqid->sequence,
 832                                         struct nfs4_state_owner, so_seqid);
 833         struct nfs_server *server = sp->so_server;
 834
 835         if (status == -NFS4ERR_BAD_SEQID)
 836                 nfs4_drop_state_owner(sp);
 837         if (!nfs4_has_session(server->nfs_client))
 838                 nfs_increment_seqid(status, seqid);
 839 }
 840
 841 /*
 842  * Increment the seqid if the LOCK/LOCKU succeeded, or
 843  * failed with a seqid incrementing error -
 844  * see comments nfs_fs.h:seqid_mutating_error()
 845  */
 846 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
 847 {
 848         nfs_increment_seqid(status, seqid);
 849 }
 850
 851 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
 852 {
 853         struct rpc_sequence *sequence = seqid->sequence->sequence;
 854         int status = 0;
 855
 856         spin_lock(&sequence->lock);
 857         if (list_empty(&seqid->list))
 858                 list_add_tail(&seqid->list, &sequence->list);
 859         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
 860                 goto unlock;
 861         rpc_sleep_on(&sequence->wait, task, NULL);
 862         status = -EAGAIN;
 863 unlock:
 864         spin_unlock(&sequence->lock);
 865         return status;
 866 }
 867
 868 static int nfs4_run_state_manager(void *);
 869
 870 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
 871 {
 872         smp_mb__before_clear_bit();
 873         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
 874         smp_mb__after_clear_bit();
 875         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
 876         rpc_wake_up(&clp->cl_rpcwaitq);
 877 }
 878
 879 /*
 880  * Schedule the nfs_client asynchronous state management routine
 881  */
 882 void nfs4_schedule_state_manager(struct nfs_client *clp)
 883 {
 884         struct task_struct *task;
 885
 886         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
 887                 return;
 888         __module_get(THIS_MODULE);
 889         atomic_inc(&clp->cl_count);
 890         task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
 891                                 rpc_peeraddr2str(clp->cl_rpcclient,
 892                                                         RPC_DISPLAY_ADDR));
 893         if (!IS_ERR(task))
 894                 return;
 895         nfs4_clear_state_manager_bit(clp);
 896         nfs_put_client(clp);
 897         module_put(THIS_MODULE);
 898 }
 899
 900 /*
 901  * Schedule a state recovery attempt
 902  */
 903 void nfs4_schedule_state_recovery(struct nfs_client *clp)
 904 {
 905         if (!clp)
 906                 return;
 907         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 908                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
 909         nfs4_schedule_state_manager(clp);
 910 }
 911
 912 int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
 913 {
 914
 915         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 916         /* Don't recover state that expired before the reboot */
 917         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
 918                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 919                 return 0;
 920         }
 921         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
 922         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
 923         return 1;
 924 }
 925
 926 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
 927 {
 928         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
 929         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
 930         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
 931         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
 932         return 1;
 933 }
 934
 935 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
 936 {
 937         struct inode *inode = state->inode;
 938         struct nfs_inode *nfsi = NFS_I(inode);
 939         struct file_lock *fl;
 940         int status = 0;
 941
 942         if (inode->i_flock == NULL)
 943                 return 0;
 944
 945         /* Guard against delegation returns and new lock/unlock calls */
 946         down_write(&nfsi->rwsem);
 947         /* Protect inode->i_flock using the BKL */
 948         lock_kernel();
 949         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
 950                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
 951                         continue;
 952                 if (nfs_file_open_context(fl->fl_file)->state != state)
 953                         continue;
 954                 unlock_kernel();
 955                 status = ops->recover_lock(state, fl);
 956                 switch (status) {
 957                         case 0:
 958                                 break;
 959                         case -ESTALE:
 960                         case -NFS4ERR_ADMIN_REVOKED:
 961                         case -NFS4ERR_STALE_STATEID:
 962                         case -NFS4ERR_BAD_STATEID:
 963                         case -NFS4ERR_EXPIRED:
 964                         case -NFS4ERR_NO_GRACE:
 965                         case -NFS4ERR_STALE_CLIENTID:
 966                         case -NFS4ERR_BADSESSION:
 967                         case -NFS4ERR_BADSLOT:
 968                         case -NFS4ERR_BAD_HIGH_SLOT:
 969                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 970                                 goto out;
 971                         default:
 972                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
 973                                                 __func__, status);
 974                         case -ENOMEM:
 975                         case -NFS4ERR_DENIED:
 976                         case -NFS4ERR_RECLAIM_BAD:
 977                         case -NFS4ERR_RECLAIM_CONFLICT:
 978                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
 979                                 status = 0;
 980                 }
 981                 lock_kernel();
 982         }
 983         unlock_kernel();
 984 out:
 985         up_write(&nfsi->rwsem);
 986         return status;
 987 }
 988
 989 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
 990 {
 991         struct nfs4_state *state;
 992         struct nfs4_lock_state *lock;
 993         int status = 0;
 994
 995         /* Note: we rely on the sp->so_states list being ordered
 996          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
 997          * states first.
 998          * This is needed to ensure that the server won't give us any
 999          * read delegations that we have to return if, say, we are
1000          * recovering after a network partition or a reboot from a
1001          * server that doesn't support a grace period.
1002          */
1003 restart:
1004         spin_lock(&sp->so_lock);
1005         list_for_each_entry(state, &sp->so_states, open_states) {
1006                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1007                         continue;
1008                 if (state->state == 0)
1009                         continue;
1010                 atomic_inc(&state->count);
1011                 spin_unlock(&sp->so_lock);
1012                 status = ops->recover_open(sp, state);
1013                 if (status >= 0) {
1014                         status = nfs4_reclaim_locks(state, ops);
1015                         if (status >= 0) {
1016                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1017                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1018                                                 printk("%s: Lock reclaim failed!\n",
1019                                                         __func__);
1020                                 }
1021                                 nfs4_put_open_state(state);
1022                                 goto restart;
1023                         }
1024                 }
1025                 switch (status) {
1026                         default:
1027                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
1028                                                 __func__, status);
1029                         case -ENOENT:
1030                         case -ENOMEM:
1031                         case -ESTALE:
1032                                 /*
1033                                  * Open state on this file cannot be recovered
1034                                  * All we can do is revert to using the zero stateid.
1035                                  */
1036                                 memset(state->stateid.data, 0,
1037                                         sizeof(state->stateid.data));
1038                                 /* Mark the file as being 'closed' */
1039                                 state->state = 0;
1040                                 break;
1041                         case -NFS4ERR_ADMIN_REVOKED:
1042                         case -NFS4ERR_STALE_STATEID:
1043                         case -NFS4ERR_BAD_STATEID:
1044                         case -NFS4ERR_RECLAIM_BAD:
1045                         case -NFS4ERR_RECLAIM_CONFLICT:
1046                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1047                                 break;
1048                         case -NFS4ERR_EXPIRED:
1049                         case -NFS4ERR_NO_GRACE:
1050                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1051                         case -NFS4ERR_STALE_CLIENTID:
1052                         case -NFS4ERR_BADSESSION:
1053                         case -NFS4ERR_BADSLOT:
1054                         case -NFS4ERR_BAD_HIGH_SLOT:
1055                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1056                                 goto out_err;
1057                 }
1058                 nfs4_put_open_state(state);
1059                 goto restart;
1060         }
1061         spin_unlock(&sp->so_lock);
1062         return 0;
1063 out_err:
1064         nfs4_put_open_state(state);
1065         return status;
1066 }
1067
1068 static void nfs4_clear_open_state(struct nfs4_state *state)
1069 {
1070         struct nfs4_lock_state *lock;
1071
1072         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1073         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1074         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1075         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1076         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1077                 lock->ls_seqid.flags = 0;
1078                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1079         }
1080 }
1081
1082 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1083 {
1084         struct nfs4_state_owner *sp;
1085         struct rb_node *pos;
1086         struct nfs4_state *state;
1087
1088         /* Reset all sequence ids to zero */
1089         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1090                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1091                 sp->so_seqid.flags = 0;
1092                 spin_lock(&sp->so_lock);
1093                 list_for_each_entry(state, &sp->so_states, open_states) {
1094                         if (mark_reclaim(clp, state))
1095                                 nfs4_clear_open_state(state);
1096                 }
1097                 spin_unlock(&sp->so_lock);
1098         }
1099 }
1100
1101 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1102 {
1103         /* Mark all delegations for reclaim */
1104         nfs_delegation_mark_reclaim(clp);
1105         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1106 }
1107
1108 static void nfs4_reclaim_complete(struct nfs_client *clp,
1109                                  const struct nfs4_state_recovery_ops *ops)
1110 {
1111         /* Notify the server we're done reclaiming our state */
1112         if (ops->reclaim_complete)
1113                 (void)ops->reclaim_complete(clp);
1114 }
1115
1116 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1117 {
1118         struct nfs4_state_owner *sp;
1119         struct rb_node *pos;
1120         struct nfs4_state *state;
1121
1122         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1123                 return;
1124
1125         nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1126
1127         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1128                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1129                 spin_lock(&sp->so_lock);
1130                 list_for_each_entry(state, &sp->so_states, open_states) {
1131                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1132                                 continue;
1133                         nfs4_state_mark_reclaim_nograce(clp, state);
1134                 }
1135                 spin_unlock(&sp->so_lock);
1136         }
1137
1138         nfs_delegation_reap_unclaimed(clp);
1139 }
1140
1141 static void nfs_delegation_clear_all(struct nfs_client *clp)
1142 {
1143         nfs_delegation_mark_reclaim(clp);
1144         nfs_delegation_reap_unclaimed(clp);
1145 }
1146
1147 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1148 {
1149         nfs_delegation_clear_all(clp);
1150         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1151 }
1152
1153 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1154 {
1155         switch (error) {
1156                 case -NFS4ERR_CB_PATH_DOWN:
1157                         nfs_handle_cb_pathdown(clp);
1158                         return 0;
1159                 case -NFS4ERR_NO_GRACE:
1160                         nfs4_state_end_reclaim_reboot(clp);
1161                         return 0;
1162                 case -NFS4ERR_STALE_CLIENTID:
1163                 case -NFS4ERR_LEASE_MOVED:
1164                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1165                         nfs4_state_end_reclaim_reboot(clp);
1166                         nfs4_state_start_reclaim_reboot(clp);
1167                         break;
1168                 case -NFS4ERR_EXPIRED:
1169                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1170                         nfs4_state_start_reclaim_nograce(clp);
1171                         break;
1172                 case -NFS4ERR_BADSESSION:
1173                 case -NFS4ERR_BADSLOT:
1174                 case -NFS4ERR_BAD_HIGH_SLOT:
1175                 case -NFS4ERR_DEADSESSION:
1176                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1177                 case -NFS4ERR_SEQ_FALSE_RETRY:
1178                 case -NFS4ERR_SEQ_MISORDERED:
1179                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1180                         /* Zero session reset errors */
1181                         return 0;
1182         }
1183         return error;
1184 }
1185
1186 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1187 {
1188         struct rb_node *pos;
1189         int status = 0;
1190
1191 restart:
1192         spin_lock(&clp->cl_lock);
1193         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1194                 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1195                 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1196                         continue;
1197                 atomic_inc(&sp->so_count);
1198                 spin_unlock(&clp->cl_lock);
1199                 status = nfs4_reclaim_open_state(sp, ops);
1200                 if (status < 0) {
1201                         set_bit(ops->owner_flag_bit, &sp->so_flags);
1202                         nfs4_put_state_owner(sp);
1203                         return nfs4_recovery_handle_error(clp, status);
1204                 }
1205                 nfs4_put_state_owner(sp);
1206                 goto restart;
1207         }
1208         spin_unlock(&clp->cl_lock);
1209         return status;
1210 }
1211
1212 static int nfs4_check_lease(struct nfs_client *clp)
1213 {
1214         struct rpc_cred *cred;
1215         const struct nfs4_state_maintenance_ops *ops =
1216                 clp->cl_mvops->state_renewal_ops;
1217         int status = -NFS4ERR_EXPIRED;
1218
1219         /* Is the client already known to have an expired lease? */
1220         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1221                 return 0;
1222         spin_lock(&clp->cl_lock);
1223         cred = ops->get_state_renewal_cred_locked(clp);
1224         spin_unlock(&clp->cl_lock);
1225         if (cred == NULL) {
1226                 cred = nfs4_get_setclientid_cred(clp);
1227                 if (cred == NULL)
1228                         goto out;
1229         }
1230         status = ops->renew_lease(clp, cred);
1231         put_rpccred(cred);
1232 out:
1233         return nfs4_recovery_handle_error(clp, status);
1234 }
1235
1236 static int nfs4_reclaim_lease(struct nfs_client *clp)
1237 {
1238         struct rpc_cred *cred;
1239         const struct nfs4_state_recovery_ops *ops =
1240                 clp->cl_mvops->reboot_recovery_ops;
1241         int status = -ENOENT;
1242
1243         cred = ops->get_clid_cred(clp);
1244         if (cred != NULL) {
1245                 status = ops->establish_clid(clp, cred);
1246                 put_rpccred(cred);
1247                 /* Handle case where the user hasn't set up machine creds */
1248                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1249                         nfs4_clear_machine_cred(clp);
1250                         status = -EAGAIN;
1251                 }
1252                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1253                         status = -EPROTONOSUPPORT;
1254         }
1255         return status;
1256 }
1257
1258 #ifdef CONFIG_NFS_V4_1
1259 void nfs41_handle_recall_slot(struct nfs_client *clp)
1260 {
1261         set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1262         nfs4_schedule_state_recovery(clp);
1263 }
1264
1265 static void nfs4_reset_all_state(struct nfs_client *clp)
1266 {
1267         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1268                 clp->cl_boot_time = CURRENT_TIME;
1269                 nfs4_state_start_reclaim_nograce(clp);
1270                 nfs4_schedule_state_recovery(clp);
1271         }
1272 }
1273
1274 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1275 {
1276         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1277                 nfs4_state_start_reclaim_reboot(clp);
1278                 nfs4_schedule_state_recovery(clp);
1279         }
1280 }
1281
1282 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1283 {
1284         /* Temporary */
1285         nfs4_reset_all_state(clp);
1286 }
1287
1288 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1289 {
1290         /* This will need to handle layouts too */
1291         nfs_expire_all_delegations(clp);
1292 }
1293
1294 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1295 {
1296         nfs_expire_all_delegations(clp);
1297         if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1298                 nfs4_schedule_state_recovery(clp);
1299 }
1300
1301 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1302 {
1303         if (!flags)
1304                 return;
1305         else if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1306                 nfs41_handle_server_reboot(clp);
1307         else if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1308                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1309                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1310                             SEQ4_STATUS_LEASE_MOVED))
1311                 nfs41_handle_state_revoked(clp);
1312         else if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1313                 nfs41_handle_recallable_state_revoked(clp);
1314         else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1315                             SEQ4_STATUS_BACKCHANNEL_FAULT |
1316                             SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1317                 nfs41_handle_cb_path_down(clp);
1318 }
1319
1320 static int nfs4_reset_session(struct nfs_client *clp)
1321 {
1322         int status;
1323
1324         nfs4_begin_drain_session(clp);
1325         status = nfs4_proc_destroy_session(clp->cl_session);
1326         if (status && status != -NFS4ERR_BADSESSION &&
1327             status != -NFS4ERR_DEADSESSION) {
1328                 status = nfs4_recovery_handle_error(clp, status);
1329                 goto out;
1330         }
1331
1332         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1333         status = nfs4_proc_create_session(clp);
1334         if (status) {
1335                 status = nfs4_recovery_handle_error(clp, status);
1336                 goto out;
1337         }
1338         /* create_session negotiated new slot table */
1339         clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1340
1341          /* Let the state manager reestablish state */
1342         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1343                 nfs41_setup_state_renewal(clp);
1344 out:
1345         return status;
1346 }
1347
1348 static int nfs4_recall_slot(struct nfs_client *clp)
1349 {
1350         struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1351         struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1352         struct nfs4_slot *new, *old;
1353         int i;
1354
1355         nfs4_begin_drain_session(clp);
1356         new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1357                       GFP_NOFS);
1358         if (!new)
1359                 return -ENOMEM;
1360
1361         spin_lock(&fc_tbl->slot_tbl_lock);
1362         for (i = 0; i < fc_tbl->target_max_slots; i++)
1363                 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1364         old = fc_tbl->slots;
1365         fc_tbl->slots = new;
1366         fc_tbl->max_slots = fc_tbl->target_max_slots;
1367         fc_tbl->target_max_slots = 0;
1368         fc_attrs->max_reqs = fc_tbl->max_slots;
1369         spin_unlock(&fc_tbl->slot_tbl_lock);
1370
1371         kfree(old);
1372         nfs4_end_drain_session(clp);
1373         return 0;
1374 }
1375
1376 #else /* CONFIG_NFS_V4_1 */
1377 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1378 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1379 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1380 #endif /* CONFIG_NFS_V4_1 */
1381
1382 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1383  * on EXCHANGE_ID for v4.1
1384  */
1385 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1386 {
1387         if (nfs4_has_session(clp)) {
1388                 switch (status) {
1389                 case -NFS4ERR_DELAY:
1390                 case -NFS4ERR_CLID_INUSE:
1391                 case -EAGAIN:
1392                 case -EKEYEXPIRED:
1393                         break;
1394
1395                 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1396                                          * in nfs4_exchange_id */
1397                 default:
1398                         return;
1399                 }
1400         }
1401         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1402 }
1403
1404 static void nfs4_state_manager(struct nfs_client *clp)
1405 {
1406         int status = 0;
1407
1408         /* Ensure exclusive access to NFSv4 state */
1409         for(;;) {
1410                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1411                         /* We're going to have to re-establish a clientid */
1412                         status = nfs4_reclaim_lease(clp);
1413                         if (status) {
1414                                 nfs4_set_lease_expired(clp, status);
1415                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1416                                                         &clp->cl_state))
1417                                         continue;
1418                                 if (clp->cl_cons_state ==
1419                                                         NFS_CS_SESSION_INITING)
1420                                         nfs_mark_client_ready(clp, status);
1421                                 goto out_error;
1422                         }
1423                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1424                         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1425                 }
1426
1427                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1428                         status = nfs4_check_lease(clp);
1429                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1430                                 continue;
1431                         if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1432                                 goto out_error;
1433                 }
1434
1435                 /* Initialize or reset the session */
1436                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1437                    && nfs4_has_session(clp)) {
1438                         status = nfs4_reset_session(clp);
1439                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1440                                 continue;
1441                         if (status < 0)
1442                                 goto out_error;
1443                 }
1444
1445                 /* First recover reboot state... */
1446                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1447                         status = nfs4_do_reclaim(clp,
1448                                 clp->cl_mvops->reboot_recovery_ops);
1449                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1450                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1451                                 continue;
1452                         nfs4_state_end_reclaim_reboot(clp);
1453                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1454                                 continue;
1455                         if (status < 0)
1456                                 goto out_error;
1457                 }
1458
1459                 /* Now recover expired state... */
1460                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1461                         status = nfs4_do_reclaim(clp,
1462                                 clp->cl_mvops->nograce_recovery_ops);
1463                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1464                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1465                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1466                                 continue;
1467                         if (status < 0)
1468                                 goto out_error;
1469                 }
1470
1471                 nfs4_end_drain_session(clp);
1472                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1473                         nfs_client_return_marked_delegations(clp);
1474                         continue;
1475                 }
1476                 /* Recall session slots */
1477                 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1478                    && nfs4_has_session(clp)) {
1479                         status = nfs4_recall_slot(clp);
1480                         if (status < 0)
1481                                 goto out_error;
1482                         continue;
1483                 }
1484
1485
1486                 nfs4_clear_state_manager_bit(clp);
1487                 /* Did we race with an attempt to give us more work? */
1488                 if (clp->cl_state == 0)
1489                         break;
1490                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1491                         break;
1492         }
1493         return;
1494 out_error:
1495         printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1496                         " with error %d\n", clp->cl_hostname, -status);
1497         nfs4_end_drain_session(clp);
1498         nfs4_clear_state_manager_bit(clp);
1499 }
1500
1501 static int nfs4_run_state_manager(void *ptr)
1502 {
1503         struct nfs_client *clp = ptr;
1504
1505         allow_signal(SIGKILL);
1506         nfs4_state_manager(clp);
1507         nfs_put_client(clp);
1508         module_put_and_exit(0);
1509         return 0;
1510 }
1511
1512 /*
1513  * Local variables:
1514  *  c-basic-offset: 8
1515  * End:
1516  */