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/fs.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/ratelimit.h>
  50 #include <linux/workqueue.h>
  51 #include <linux/bitops.h>
  52 #include <linux/jiffies.h>
  53
  54 #include "nfs4_fs.h"
  55 #include "callback.h"
  56 #include "delegation.h"
  57 #include "internal.h"
  58 #include "pnfs.h"
  59
  60 #define OPENOWNER_POOL_SIZE     8
  61
  62 const nfs4_stateid zero_stateid;
  63
  64 static LIST_HEAD(nfs4_clientid_list);
  65
  66 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
  67 {
  68         struct nfs4_setclientid_res clid = {
  69                 .clientid = clp->cl_clientid,
  70                 .confirm = clp->cl_confirm,
  71         };
  72         unsigned short port;
  73         int status;
  74
  75         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
  76                 goto do_confirm;
  77         port = nfs_callback_tcpport;
  78         if (clp->cl_addr.ss_family == AF_INET6)
  79                 port = nfs_callback_tcpport6;
  80
  81         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
  82         if (status != 0)
  83                 goto out;
  84         clp->cl_clientid = clid.clientid;
  85         clp->cl_confirm = clid.confirm;
  86         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  87 do_confirm:
  88         status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
  89         if (status != 0)
  90                 goto out;
  91         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
  92         nfs4_schedule_state_renewal(clp);
  93 out:
  94         return status;
  95 }
  96
  97 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
  98 {
  99         struct rpc_cred *cred = NULL;
 100
 101         if (clp->cl_machine_cred != NULL)
 102                 cred = get_rpccred(clp->cl_machine_cred);
 103         return cred;
 104 }
 105
 106 static void nfs4_clear_machine_cred(struct nfs_client *clp)
 107 {
 108         struct rpc_cred *cred;
 109
 110         spin_lock(&clp->cl_lock);
 111         cred = clp->cl_machine_cred;
 112         clp->cl_machine_cred = NULL;
 113         spin_unlock(&clp->cl_lock);
 114         if (cred != NULL)
 115                 put_rpccred(cred);
 116 }
 117
 118 static struct rpc_cred *
 119 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
 120 {
 121         struct rpc_cred *cred = NULL;
 122         struct nfs4_state_owner *sp;
 123         struct rb_node *pos;
 124
 125         for (pos = rb_first(&server->state_owners);
 126              pos != NULL;
 127              pos = rb_next(pos)) {
 128                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 129                 if (list_empty(&sp->so_states))
 130                         continue;
 131                 cred = get_rpccred(sp->so_cred);
 132                 break;
 133         }
 134         return cred;
 135 }
 136
 137 /**
 138  * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
 139  * @clp: client state handle
 140  *
 141  * Returns an rpc_cred with reference count bumped, or NULL.
 142  * Caller must hold clp->cl_lock.
 143  */
 144 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 145 {
 146         struct rpc_cred *cred = NULL;
 147         struct nfs_server *server;
 148
 149         /* Use machine credentials if available */
 150         cred = nfs4_get_machine_cred_locked(clp);
 151         if (cred != NULL)
 152                 goto out;
 153
 154         rcu_read_lock();
 155         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 156                 cred = nfs4_get_renew_cred_server_locked(server);
 157                 if (cred != NULL)
 158                         break;
 159         }
 160         rcu_read_unlock();
 161
 162 out:
 163         return cred;
 164 }
 165
 166 #if defined(CONFIG_NFS_V4_1)
 167
 168 static int nfs41_setup_state_renewal(struct nfs_client *clp)
 169 {
 170         int status;
 171         struct nfs_fsinfo fsinfo;
 172
 173         if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
 174                 nfs4_schedule_state_renewal(clp);
 175                 return 0;
 176         }
 177
 178         status = nfs4_proc_get_lease_time(clp, &fsinfo);
 179         if (status == 0) {
 180                 /* Update lease time and schedule renewal */
 181                 spin_lock(&clp->cl_lock);
 182                 clp->cl_lease_time = fsinfo.lease_time * HZ;
 183                 clp->cl_last_renewal = jiffies;
 184                 spin_unlock(&clp->cl_lock);
 185
 186                 nfs4_schedule_state_renewal(clp);
 187         }
 188
 189         return status;
 190 }
 191
 192 /*
 193  * Back channel returns NFS4ERR_DELAY for new requests when
 194  * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
 195  * is ended.
 196  */
 197 static void nfs4_end_drain_session(struct nfs_client *clp)
 198 {
 199         struct nfs4_session *ses = clp->cl_session;
 200         struct nfs4_slot_table *tbl;
 201         int max_slots;
 202
 203         if (ses == NULL)
 204                 return;
 205         tbl = &ses->fc_slot_table;
 206         if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 207                 spin_lock(&tbl->slot_tbl_lock);
 208                 max_slots = tbl->max_slots;
 209                 while (max_slots--) {
 210                         if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
 211                                                 nfs4_set_task_privileged,
 212                                                 NULL) == NULL)
 213                                 break;
 214                 }
 215                 spin_unlock(&tbl->slot_tbl_lock);
 216         }
 217 }
 218
 219 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl)
 220 {
 221         spin_lock(&tbl->slot_tbl_lock);
 222         if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
 223                 INIT_COMPLETION(tbl->complete);
 224                 spin_unlock(&tbl->slot_tbl_lock);
 225                 return wait_for_completion_interruptible(&tbl->complete);
 226         }
 227         spin_unlock(&tbl->slot_tbl_lock);
 228         return 0;
 229 }
 230
 231 static int nfs4_begin_drain_session(struct nfs_client *clp)
 232 {
 233         struct nfs4_session *ses = clp->cl_session;
 234         int ret = 0;
 235
 236         set_bit(NFS4_SESSION_DRAINING, &ses->session_state);
 237         /* back channel */
 238         ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table);
 239         if (ret)
 240                 return ret;
 241         /* fore channel */
 242         return nfs4_wait_on_slot_tbl(&ses->fc_slot_table);
 243 }
 244
 245 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 246 {
 247         int status;
 248
 249         if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
 250                 goto do_confirm;
 251         nfs4_begin_drain_session(clp);
 252         status = nfs4_proc_exchange_id(clp, cred);
 253         if (status != 0)
 254                 goto out;
 255         set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 256 do_confirm:
 257         status = nfs4_proc_create_session(clp);
 258         if (status != 0)
 259                 goto out;
 260         clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
 261         nfs41_setup_state_renewal(clp);
 262         nfs_mark_client_ready(clp, NFS_CS_READY);
 263 out:
 264         return status;
 265 }
 266
 267 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
 268 {
 269         struct rpc_cred *cred;
 270
 271         spin_lock(&clp->cl_lock);
 272         cred = nfs4_get_machine_cred_locked(clp);
 273         spin_unlock(&clp->cl_lock);
 274         return cred;
 275 }
 276
 277 #endif /* CONFIG_NFS_V4_1 */
 278
 279 static struct rpc_cred *
 280 nfs4_get_setclientid_cred_server(struct nfs_server *server)
 281 {
 282         struct nfs_client *clp = server->nfs_client;
 283         struct rpc_cred *cred = NULL;
 284         struct nfs4_state_owner *sp;
 285         struct rb_node *pos;
 286
 287         spin_lock(&clp->cl_lock);
 288         pos = rb_first(&server->state_owners);
 289         if (pos != NULL) {
 290                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
 291                 cred = get_rpccred(sp->so_cred);
 292         }
 293         spin_unlock(&clp->cl_lock);
 294         return cred;
 295 }
 296
 297 /**
 298  * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
 299  * @clp: client state handle
 300  *
 301  * Returns an rpc_cred with reference count bumped, or NULL.
 302  */
 303 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 304 {
 305         struct nfs_server *server;
 306         struct rpc_cred *cred;
 307
 308         spin_lock(&clp->cl_lock);
 309         cred = nfs4_get_machine_cred_locked(clp);
 310         spin_unlock(&clp->cl_lock);
 311         if (cred != NULL)
 312                 goto out;
 313
 314         rcu_read_lock();
 315         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
 316                 cred = nfs4_get_setclientid_cred_server(server);
 317                 if (cred != NULL)
 318                         break;
 319         }
 320         rcu_read_unlock();
 321
 322 out:
 323         return cred;
 324 }
 325
 326 static struct nfs4_state_owner *
 327 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
 328 {
 329         struct rb_node **p = &server->state_owners.rb_node,
 330                        *parent = NULL;
 331         struct nfs4_state_owner *sp;
 332
 333         while (*p != NULL) {
 334                 parent = *p;
 335                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 336
 337                 if (cred < sp->so_cred)
 338                         p = &parent->rb_left;
 339                 else if (cred > sp->so_cred)
 340                         p = &parent->rb_right;
 341                 else {
 342                         if (!list_empty(&sp->so_lru))
 343                                 list_del_init(&sp->so_lru);
 344                         atomic_inc(&sp->so_count);
 345                         return sp;
 346                 }
 347         }
 348         return NULL;
 349 }
 350
 351 static struct nfs4_state_owner *
 352 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
 353 {
 354         struct nfs_server *server = new->so_server;
 355         struct rb_node **p = &server->state_owners.rb_node,
 356                        *parent = NULL;
 357         struct nfs4_state_owner *sp;
 358         int err;
 359
 360         while (*p != NULL) {
 361                 parent = *p;
 362                 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
 363
 364                 if (new->so_cred < sp->so_cred)
 365                         p = &parent->rb_left;
 366                 else if (new->so_cred > sp->so_cred)
 367                         p = &parent->rb_right;
 368                 else {
 369                         if (!list_empty(&sp->so_lru))
 370                                 list_del_init(&sp->so_lru);
 371                         atomic_inc(&sp->so_count);
 372                         return sp;
 373                 }
 374         }
 375         err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
 376         if (err)
 377                 return ERR_PTR(err);
 378         rb_link_node(&new->so_server_node, parent, p);
 379         rb_insert_color(&new->so_server_node, &server->state_owners);
 380         return new;
 381 }
 382
 383 static void
 384 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
 385 {
 386         struct nfs_server *server = sp->so_server;
 387
 388         if (!RB_EMPTY_NODE(&sp->so_server_node))
 389                 rb_erase(&sp->so_server_node, &server->state_owners);
 390         ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
 391 }
 392
 393 static void
 394 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
 395 {
 396         sc->flags = 0;
 397         sc->counter = 0;
 398         spin_lock_init(&sc->lock);
 399         INIT_LIST_HEAD(&sc->list);
 400         rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
 401 }
 402
 403 static void
 404 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
 405 {
 406         rpc_destroy_wait_queue(&sc->wait);
 407 }
 408
 409 /*
 410  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
 411  * create a new state_owner.
 412  *
 413  */
 414 static struct nfs4_state_owner *
 415 nfs4_alloc_state_owner(struct nfs_server *server,
 416                 struct rpc_cred *cred,
 417                 gfp_t gfp_flags)
 418 {
 419         struct nfs4_state_owner *sp;
 420
 421         sp = kzalloc(sizeof(*sp), gfp_flags);
 422         if (!sp)
 423                 return NULL;
 424         sp->so_server = server;
 425         sp->so_cred = get_rpccred(cred);
 426         spin_lock_init(&sp->so_lock);
 427         INIT_LIST_HEAD(&sp->so_states);
 428         nfs4_init_seqid_counter(&sp->so_seqid);
 429         atomic_set(&sp->so_count, 1);
 430         INIT_LIST_HEAD(&sp->so_lru);
 431         return sp;
 432 }
 433
 434 static void
 435 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
 436 {
 437         if (!RB_EMPTY_NODE(&sp->so_server_node)) {
 438                 struct nfs_server *server = sp->so_server;
 439                 struct nfs_client *clp = server->nfs_client;
 440
 441                 spin_lock(&clp->cl_lock);
 442                 rb_erase(&sp->so_server_node, &server->state_owners);
 443                 RB_CLEAR_NODE(&sp->so_server_node);
 444                 spin_unlock(&clp->cl_lock);
 445         }
 446 }
 447
 448 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
 449 {
 450         nfs4_destroy_seqid_counter(&sp->so_seqid);
 451         put_rpccred(sp->so_cred);
 452         kfree(sp);
 453 }
 454
 455 static void nfs4_gc_state_owners(struct nfs_server *server)
 456 {
 457         struct nfs_client *clp = server->nfs_client;
 458         struct nfs4_state_owner *sp, *tmp;
 459         unsigned long time_min, time_max;
 460         LIST_HEAD(doomed);
 461
 462         spin_lock(&clp->cl_lock);
 463         time_max = jiffies;
 464         time_min = (long)time_max - (long)clp->cl_lease_time;
 465         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 466                 /* NB: LRU is sorted so that oldest is at the head */
 467                 if (time_in_range(sp->so_expires, time_min, time_max))
 468                         break;
 469                 list_move(&sp->so_lru, &doomed);
 470                 nfs4_remove_state_owner_locked(sp);
 471         }
 472         spin_unlock(&clp->cl_lock);
 473
 474         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 475                 list_del(&sp->so_lru);
 476                 nfs4_free_state_owner(sp);
 477         }
 478 }
 479
 480 /**
 481  * nfs4_get_state_owner - Look up a state owner given a credential
 482  * @server: nfs_server to search
 483  * @cred: RPC credential to match
 484  *
 485  * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
 486  */
 487 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
 488                                               struct rpc_cred *cred,
 489                                               gfp_t gfp_flags)
 490 {
 491         struct nfs_client *clp = server->nfs_client;
 492         struct nfs4_state_owner *sp, *new;
 493
 494         spin_lock(&clp->cl_lock);
 495         sp = nfs4_find_state_owner_locked(server, cred);
 496         spin_unlock(&clp->cl_lock);
 497         if (sp != NULL)
 498                 goto out;
 499         new = nfs4_alloc_state_owner(server, cred, gfp_flags);
 500         if (new == NULL)
 501                 goto out;
 502         do {
 503                 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
 504                         break;
 505                 spin_lock(&clp->cl_lock);
 506                 sp = nfs4_insert_state_owner_locked(new);
 507                 spin_unlock(&clp->cl_lock);
 508         } while (sp == ERR_PTR(-EAGAIN));
 509         if (sp != new)
 510                 nfs4_free_state_owner(new);
 511 out:
 512         nfs4_gc_state_owners(server);
 513         return sp;
 514 }
 515
 516 /**
 517  * nfs4_put_state_owner - Release a nfs4_state_owner
 518  * @sp: state owner data to release
 519  */
 520 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
 521 {
 522         struct nfs_server *server = sp->so_server;
 523         struct nfs_client *clp = server->nfs_client;
 524
 525         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
 526                 return;
 527
 528         if (!RB_EMPTY_NODE(&sp->so_server_node)) {
 529                 sp->so_expires = jiffies;
 530                 list_add_tail(&sp->so_lru, &server->state_owners_lru);
 531                 spin_unlock(&clp->cl_lock);
 532         } else {
 533                 nfs4_remove_state_owner_locked(sp);
 534                 spin_unlock(&clp->cl_lock);
 535                 nfs4_free_state_owner(sp);
 536         }
 537 }
 538
 539 /**
 540  * nfs4_purge_state_owners - Release all cached state owners
 541  * @server: nfs_server with cached state owners to release
 542  *
 543  * Called at umount time.  Remaining state owners will be on
 544  * the LRU with ref count of zero.
 545  */
 546 void nfs4_purge_state_owners(struct nfs_server *server)
 547 {
 548         struct nfs_client *clp = server->nfs_client;
 549         struct nfs4_state_owner *sp, *tmp;
 550         LIST_HEAD(doomed);
 551
 552         spin_lock(&clp->cl_lock);
 553         list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
 554                 list_move(&sp->so_lru, &doomed);
 555                 nfs4_remove_state_owner_locked(sp);
 556         }
 557         spin_unlock(&clp->cl_lock);
 558
 559         list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
 560                 list_del(&sp->so_lru);
 561                 nfs4_free_state_owner(sp);
 562         }
 563 }
 564
 565 static struct nfs4_state *
 566 nfs4_alloc_open_state(void)
 567 {
 568         struct nfs4_state *state;
 569
 570         state = kzalloc(sizeof(*state), GFP_NOFS);
 571         if (!state)
 572                 return NULL;
 573         atomic_set(&state->count, 1);
 574         INIT_LIST_HEAD(&state->lock_states);
 575         spin_lock_init(&state->state_lock);
 576         seqlock_init(&state->seqlock);
 577         return state;
 578 }
 579
 580 void
 581 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
 582 {
 583         if (state->state == fmode)
 584                 return;
 585         /* NB! List reordering - see the reclaim code for why.  */
 586         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
 587                 if (fmode & FMODE_WRITE)
 588                         list_move(&state->open_states, &state->owner->so_states);
 589                 else
 590                         list_move_tail(&state->open_states, &state->owner->so_states);
 591         }
 592         state->state = fmode;
 593 }
 594
 595 static struct nfs4_state *
 596 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
 597 {
 598         struct nfs_inode *nfsi = NFS_I(inode);
 599         struct nfs4_state *state;
 600
 601         list_for_each_entry(state, &nfsi->open_states, inode_states) {
 602                 if (state->owner != owner)
 603                         continue;
 604                 if (atomic_inc_not_zero(&state->count))
 605                         return state;
 606         }
 607         return NULL;
 608 }
 609
 610 static void
 611 nfs4_free_open_state(struct nfs4_state *state)
 612 {
 613         kfree(state);
 614 }
 615
 616 struct nfs4_state *
 617 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
 618 {
 619         struct nfs4_state *state, *new;
 620         struct nfs_inode *nfsi = NFS_I(inode);
 621
 622         spin_lock(&inode->i_lock);
 623         state = __nfs4_find_state_byowner(inode, owner);
 624         spin_unlock(&inode->i_lock);
 625         if (state)
 626                 goto out;
 627         new = nfs4_alloc_open_state();
 628         spin_lock(&owner->so_lock);
 629         spin_lock(&inode->i_lock);
 630         state = __nfs4_find_state_byowner(inode, owner);
 631         if (state == NULL && new != NULL) {
 632                 state = new;
 633                 state->owner = owner;
 634                 atomic_inc(&owner->so_count);
 635                 list_add(&state->inode_states, &nfsi->open_states);
 636                 ihold(inode);
 637                 state->inode = inode;
 638                 spin_unlock(&inode->i_lock);
 639                 /* Note: The reclaim code dictates that we add stateless
 640                  * and read-only stateids to the end of the list */
 641                 list_add_tail(&state->open_states, &owner->so_states);
 642                 spin_unlock(&owner->so_lock);
 643         } else {
 644                 spin_unlock(&inode->i_lock);
 645                 spin_unlock(&owner->so_lock);
 646                 if (new)
 647                         nfs4_free_open_state(new);
 648         }
 649 out:
 650         return state;
 651 }
 652
 653 void nfs4_put_open_state(struct nfs4_state *state)
 654 {
 655         struct inode *inode = state->inode;
 656         struct nfs4_state_owner *owner = state->owner;
 657
 658         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
 659                 return;
 660         spin_lock(&inode->i_lock);
 661         list_del(&state->inode_states);
 662         list_del(&state->open_states);
 663         spin_unlock(&inode->i_lock);
 664         spin_unlock(&owner->so_lock);
 665         iput(inode);
 666         nfs4_free_open_state(state);
 667         nfs4_put_state_owner(owner);
 668 }
 669
 670 /*
 671  * Close the current file.
 672  */
 673 static void __nfs4_close(struct nfs4_state *state,
 674                 fmode_t fmode, gfp_t gfp_mask, int wait)
 675 {
 676         struct nfs4_state_owner *owner = state->owner;
 677         int call_close = 0;
 678         fmode_t newstate;
 679
 680         atomic_inc(&owner->so_count);
 681         /* Protect against nfs4_find_state() */
 682         spin_lock(&owner->so_lock);
 683         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 684                 case FMODE_READ:
 685                         state->n_rdonly--;
 686                         break;
 687                 case FMODE_WRITE:
 688                         state->n_wronly--;
 689                         break;
 690                 case FMODE_READ|FMODE_WRITE:
 691                         state->n_rdwr--;
 692         }
 693         newstate = FMODE_READ|FMODE_WRITE;
 694         if (state->n_rdwr == 0) {
 695                 if (state->n_rdonly == 0) {
 696                         newstate &= ~FMODE_READ;
 697                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
 698                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 699                 }
 700                 if (state->n_wronly == 0) {
 701                         newstate &= ~FMODE_WRITE;
 702                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
 703                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
 704                 }
 705                 if (newstate == 0)
 706                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 707         }
 708         nfs4_state_set_mode_locked(state, newstate);
 709         spin_unlock(&owner->so_lock);
 710
 711         if (!call_close) {
 712                 nfs4_put_open_state(state);
 713                 nfs4_put_state_owner(owner);
 714         } else {
 715                 bool roc = pnfs_roc(state->inode);
 716
 717                 nfs4_do_close(state, gfp_mask, wait, roc);
 718         }
 719 }
 720
 721 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
 722 {
 723         __nfs4_close(state, fmode, GFP_NOFS, 0);
 724 }
 725
 726 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
 727 {
 728         __nfs4_close(state, fmode, GFP_KERNEL, 1);
 729 }
 730
 731 /*
 732  * Search the state->lock_states for an existing lock_owner
 733  * that is compatible with current->files
 734  */
 735 static struct nfs4_lock_state *
 736 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 737 {
 738         struct nfs4_lock_state *pos;
 739         list_for_each_entry(pos, &state->lock_states, ls_locks) {
 740                 if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type)
 741                         continue;
 742                 switch (pos->ls_owner.lo_type) {
 743                 case NFS4_POSIX_LOCK_TYPE:
 744                         if (pos->ls_owner.lo_u.posix_owner != fl_owner)
 745                                 continue;
 746                         break;
 747                 case NFS4_FLOCK_LOCK_TYPE:
 748                         if (pos->ls_owner.lo_u.flock_owner != fl_pid)
 749                                 continue;
 750                 }
 751                 atomic_inc(&pos->ls_count);
 752                 return pos;
 753         }
 754         return NULL;
 755 }
 756
 757 /*
 758  * Return a compatible lock_state. If no initialized lock_state structure
 759  * exists, return an uninitialized one.
 760  *
 761  */
 762 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type)
 763 {
 764         struct nfs4_lock_state *lsp;
 765         struct nfs_server *server = state->owner->so_server;
 766
 767         lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
 768         if (lsp == NULL)
 769                 return NULL;
 770         nfs4_init_seqid_counter(&lsp->ls_seqid);
 771         atomic_set(&lsp->ls_count, 1);
 772         lsp->ls_state = state;
 773         lsp->ls_owner.lo_type = type;
 774         switch (lsp->ls_owner.lo_type) {
 775         case NFS4_FLOCK_LOCK_TYPE:
 776                 lsp->ls_owner.lo_u.flock_owner = fl_pid;
 777                 break;
 778         case NFS4_POSIX_LOCK_TYPE:
 779                 lsp->ls_owner.lo_u.posix_owner = fl_owner;
 780                 break;
 781         default:
 782                 goto out_free;
 783         }
 784         lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
 785         if (lsp->ls_seqid.owner_id < 0)
 786                 goto out_free;
 787         INIT_LIST_HEAD(&lsp->ls_locks);
 788         return lsp;
 789 out_free:
 790         kfree(lsp);
 791         return NULL;
 792 }
 793
 794 void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
 795 {
 796         struct nfs_server *server = lsp->ls_state->owner->so_server;
 797
 798         ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
 799         nfs4_destroy_seqid_counter(&lsp->ls_seqid);
 800         kfree(lsp);
 801 }
 802
 803 /*
 804  * Return a compatible lock_state. If no initialized lock_state structure
 805  * exists, return an uninitialized one.
 806  *
 807  */
 808 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type)
 809 {
 810         struct nfs4_lock_state *lsp, *new = NULL;
 811
 812         for(;;) {
 813                 spin_lock(&state->state_lock);
 814                 lsp = __nfs4_find_lock_state(state, owner, pid, type);
 815                 if (lsp != NULL)
 816                         break;
 817                 if (new != NULL) {
 818                         list_add(&new->ls_locks, &state->lock_states);
 819                         set_bit(LK_STATE_IN_USE, &state->flags);
 820                         lsp = new;
 821                         new = NULL;
 822                         break;
 823                 }
 824                 spin_unlock(&state->state_lock);
 825                 new = nfs4_alloc_lock_state(state, owner, pid, type);
 826                 if (new == NULL)
 827                         return NULL;
 828         }
 829         spin_unlock(&state->state_lock);
 830         if (new != NULL)
 831                 nfs4_free_lock_state(new);
 832         return lsp;
 833 }
 834
 835 /*
 836  * Release reference to lock_state, and free it if we see that
 837  * it is no longer in use
 838  */
 839 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
 840 {
 841         struct nfs4_state *state;
 842
 843         if (lsp == NULL)
 844                 return;
 845         state = lsp->ls_state;
 846         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
 847                 return;
 848         list_del(&lsp->ls_locks);
 849         if (list_empty(&state->lock_states))
 850                 clear_bit(LK_STATE_IN_USE, &state->flags);
 851         spin_unlock(&state->state_lock);
 852         if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
 853                 if (nfs4_release_lockowner(lsp) == 0)
 854                         return;
 855         }
 856         nfs4_free_lock_state(lsp);
 857 }
 858
 859 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
 860 {
 861         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
 862
 863         dst->fl_u.nfs4_fl.owner = lsp;
 864         atomic_inc(&lsp->ls_count);
 865 }
 866
 867 static void nfs4_fl_release_lock(struct file_lock *fl)
 868 {
 869         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
 870 }
 871
 872 static const struct file_lock_operations nfs4_fl_lock_ops = {
 873         .fl_copy_lock = nfs4_fl_copy_lock,
 874         .fl_release_private = nfs4_fl_release_lock,
 875 };
 876
 877 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
 878 {
 879         struct nfs4_lock_state *lsp;
 880
 881         if (fl->fl_ops != NULL)
 882                 return 0;
 883         if (fl->fl_flags & FL_POSIX)
 884                 lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE);
 885         else if (fl->fl_flags & FL_FLOCK)
 886                 lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid,
 887                                 NFS4_FLOCK_LOCK_TYPE);
 888         else
 889                 return -EINVAL;
 890         if (lsp == NULL)
 891                 return -ENOMEM;
 892         fl->fl_u.nfs4_fl.owner = lsp;
 893         fl->fl_ops = &nfs4_fl_lock_ops;
 894         return 0;
 895 }
 896
 897 static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state,
 898                 fl_owner_t fl_owner, pid_t fl_pid)
 899 {
 900         struct nfs4_lock_state *lsp;
 901         bool ret = false;
 902
 903         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
 904                 goto out;
 905
 906         spin_lock(&state->state_lock);
 907         lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE);
 908         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) {
 909                 nfs4_stateid_copy(dst, &lsp->ls_stateid);
 910                 ret = true;
 911         }
 912         spin_unlock(&state->state_lock);
 913         nfs4_put_lock_state(lsp);
 914 out:
 915         return ret;
 916 }
 917
 918 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
 919 {
 920         int seq;
 921
 922         do {
 923                 seq = read_seqbegin(&state->seqlock);
 924                 nfs4_stateid_copy(dst, &state->stateid);
 925         } while (read_seqretry(&state->seqlock, seq));
 926 }
 927
 928 /*
 929  * Byte-range lock aware utility to initialize the stateid of read/write
 930  * requests.
 931  */
 932 void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
 933                 fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid)
 934 {
 935         if (nfs4_copy_delegation_stateid(dst, state->inode, fmode))
 936                 return;
 937         if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid))
 938                 return;
 939         nfs4_copy_open_stateid(dst, state);
 940 }
 941
 942 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
 943 {
 944         struct nfs_seqid *new;
 945
 946         new = kmalloc(sizeof(*new), gfp_mask);
 947         if (new != NULL) {
 948                 new->sequence = counter;
 949                 INIT_LIST_HEAD(&new->list);
 950                 new->task = NULL;
 951         }
 952         return new;
 953 }
 954
 955 void nfs_release_seqid(struct nfs_seqid *seqid)
 956 {
 957         struct nfs_seqid_counter *sequence;
 958
 959         if (list_empty(&seqid->list))
 960                 return;
 961         sequence = seqid->sequence;
 962         spin_lock(&sequence->lock);
 963         list_del_init(&seqid->list);
 964         if (!list_empty(&sequence->list)) {
 965                 struct nfs_seqid *next;
 966
 967                 next = list_first_entry(&sequence->list,
 968                                 struct nfs_seqid, list);
 969                 rpc_wake_up_queued_task(&sequence->wait, next->task);
 970         }
 971         spin_unlock(&sequence->lock);
 972 }
 973
 974 void nfs_free_seqid(struct nfs_seqid *seqid)
 975 {
 976         nfs_release_seqid(seqid);
 977         kfree(seqid);
 978 }
 979
 980 /*
 981  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
 982  * failed with a seqid incrementing error -
 983  * see comments nfs_fs.h:seqid_mutating_error()
 984  */
 985 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
 986 {
 987         BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid);
 988         switch (status) {
 989                 case 0:
 990                         break;
 991                 case -NFS4ERR_BAD_SEQID:
 992                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
 993                                 return;
 994                         pr_warn_ratelimited("NFS: v4 server returned a bad"
 995                                         " sequence-id error on an"
 996                                         " unconfirmed sequence %p!\n",
 997                                         seqid->sequence);
 998                 case -NFS4ERR_STALE_CLIENTID:
 999                 case -NFS4ERR_STALE_STATEID:
1000                 case -NFS4ERR_BAD_STATEID:
1001                 case -NFS4ERR_BADXDR:
1002                 case -NFS4ERR_RESOURCE:
1003                 case -NFS4ERR_NOFILEHANDLE:
1004                         /* Non-seqid mutating errors */
1005                         return;
1006         };
1007         /*
1008          * Note: no locking needed as we are guaranteed to be first
1009          * on the sequence list
1010          */
1011         seqid->sequence->counter++;
1012 }
1013
1014 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1015 {
1016         struct nfs4_state_owner *sp = container_of(seqid->sequence,
1017                                         struct nfs4_state_owner, so_seqid);
1018         struct nfs_server *server = sp->so_server;
1019
1020         if (status == -NFS4ERR_BAD_SEQID)
1021                 nfs4_drop_state_owner(sp);
1022         if (!nfs4_has_session(server->nfs_client))
1023                 nfs_increment_seqid(status, seqid);
1024 }
1025
1026 /*
1027  * Increment the seqid if the LOCK/LOCKU succeeded, or
1028  * failed with a seqid incrementing error -
1029  * see comments nfs_fs.h:seqid_mutating_error()
1030  */
1031 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1032 {
1033         nfs_increment_seqid(status, seqid);
1034 }
1035
1036 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1037 {
1038         struct nfs_seqid_counter *sequence = seqid->sequence;
1039         int status = 0;
1040
1041         spin_lock(&sequence->lock);
1042         seqid->task = task;
1043         if (list_empty(&seqid->list))
1044                 list_add_tail(&seqid->list, &sequence->list);
1045         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1046                 goto unlock;
1047         rpc_sleep_on(&sequence->wait, task, NULL);
1048         status = -EAGAIN;
1049 unlock:
1050         spin_unlock(&sequence->lock);
1051         return status;
1052 }
1053
1054 static int nfs4_run_state_manager(void *);
1055
1056 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1057 {
1058         smp_mb__before_clear_bit();
1059         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1060         smp_mb__after_clear_bit();
1061         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1062         rpc_wake_up(&clp->cl_rpcwaitq);
1063 }
1064
1065 /*
1066  * Schedule the nfs_client asynchronous state management routine
1067  */
1068 void nfs4_schedule_state_manager(struct nfs_client *clp)
1069 {
1070         struct task_struct *task;
1071         char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1072
1073         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1074                 return;
1075         __module_get(THIS_MODULE);
1076         atomic_inc(&clp->cl_count);
1077
1078         /* The rcu_read_lock() is not strictly necessary, as the state
1079          * manager is the only thread that ever changes the rpc_xprt
1080          * after it's initialized.  At this point, we're single threaded. */
1081         rcu_read_lock();
1082         snprintf(buf, sizeof(buf), "%s-manager",
1083                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1084         rcu_read_unlock();
1085         task = kthread_run(nfs4_run_state_manager, clp, buf);
1086         if (IS_ERR(task)) {
1087                 printk(KERN_ERR "%s: kthread_run: %ld\n",
1088                         __func__, PTR_ERR(task));
1089                 nfs4_clear_state_manager_bit(clp);
1090                 nfs_put_client(clp);
1091                 module_put(THIS_MODULE);
1092         }
1093 }
1094
1095 /*
1096  * Schedule a lease recovery attempt
1097  */
1098 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1099 {
1100         if (!clp)
1101                 return;
1102         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1103                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1104         nfs4_schedule_state_manager(clp);
1105 }
1106 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1107
1108 /*
1109  * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1110  * @clp: client to process
1111  *
1112  * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1113  * resend of the SETCLIENTID and hence re-establish the
1114  * callback channel. Then return all existing delegations.
1115  */
1116 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1117 {
1118         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1119         nfs_expire_all_delegations(clp);
1120 }
1121
1122 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1123 {
1124         nfs40_handle_cb_pathdown(clp);
1125         nfs4_schedule_state_manager(clp);
1126 }
1127
1128 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1129 {
1130
1131         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1132         /* Don't recover state that expired before the reboot */
1133         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1134                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1135                 return 0;
1136         }
1137         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1138         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1139         return 1;
1140 }
1141
1142 static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1143 {
1144         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1145         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1146         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1147         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1148         return 1;
1149 }
1150
1151 void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1152 {
1153         struct nfs_client *clp = server->nfs_client;
1154
1155         nfs4_state_mark_reclaim_nograce(clp, state);
1156         nfs4_schedule_state_manager(clp);
1157 }
1158 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1159
1160 void nfs_inode_find_state_and_recover(struct inode *inode,
1161                 const nfs4_stateid *stateid)
1162 {
1163         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1164         struct nfs_inode *nfsi = NFS_I(inode);
1165         struct nfs_open_context *ctx;
1166         struct nfs4_state *state;
1167         bool found = false;
1168
1169         spin_lock(&inode->i_lock);
1170         list_for_each_entry(ctx, &nfsi->open_files, list) {
1171                 state = ctx->state;
1172                 if (state == NULL)
1173                         continue;
1174                 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1175                         continue;
1176                 if (!nfs4_stateid_match(&state->stateid, stateid))
1177                         continue;
1178                 nfs4_state_mark_reclaim_nograce(clp, state);
1179                 found = true;
1180         }
1181         spin_unlock(&inode->i_lock);
1182         if (found)
1183                 nfs4_schedule_state_manager(clp);
1184 }
1185
1186
1187 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1188 {
1189         struct inode *inode = state->inode;
1190         struct nfs_inode *nfsi = NFS_I(inode);
1191         struct file_lock *fl;
1192         int status = 0;
1193
1194         if (inode->i_flock == NULL)
1195                 return 0;
1196
1197         /* Guard against delegation returns and new lock/unlock calls */
1198         down_write(&nfsi->rwsem);
1199         /* Protect inode->i_flock using the BKL */
1200         lock_flocks();
1201         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
1202                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
1203                         continue;
1204                 if (nfs_file_open_context(fl->fl_file)->state != state)
1205                         continue;
1206                 unlock_flocks();
1207                 status = ops->recover_lock(state, fl);
1208                 switch (status) {
1209                         case 0:
1210                                 break;
1211                         case -ESTALE:
1212                         case -NFS4ERR_ADMIN_REVOKED:
1213                         case -NFS4ERR_STALE_STATEID:
1214                         case -NFS4ERR_BAD_STATEID:
1215                         case -NFS4ERR_EXPIRED:
1216                         case -NFS4ERR_NO_GRACE:
1217                         case -NFS4ERR_STALE_CLIENTID:
1218                         case -NFS4ERR_BADSESSION:
1219                         case -NFS4ERR_BADSLOT:
1220                         case -NFS4ERR_BAD_HIGH_SLOT:
1221                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1222                                 goto out;
1223                         default:
1224                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1225                                         "Zeroing state\n", __func__, status);
1226                         case -ENOMEM:
1227                         case -NFS4ERR_DENIED:
1228                         case -NFS4ERR_RECLAIM_BAD:
1229                         case -NFS4ERR_RECLAIM_CONFLICT:
1230                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1231                                 status = 0;
1232                 }
1233                 lock_flocks();
1234         }
1235         unlock_flocks();
1236 out:
1237         up_write(&nfsi->rwsem);
1238         return status;
1239 }
1240
1241 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1242 {
1243         struct nfs4_state *state;
1244         struct nfs4_lock_state *lock;
1245         int status = 0;
1246
1247         /* Note: we rely on the sp->so_states list being ordered
1248          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1249          * states first.
1250          * This is needed to ensure that the server won't give us any
1251          * read delegations that we have to return if, say, we are
1252          * recovering after a network partition or a reboot from a
1253          * server that doesn't support a grace period.
1254          */
1255 restart:
1256         spin_lock(&sp->so_lock);
1257         list_for_each_entry(state, &sp->so_states, open_states) {
1258                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1259                         continue;
1260                 if (state->state == 0)
1261                         continue;
1262                 atomic_inc(&state->count);
1263                 spin_unlock(&sp->so_lock);
1264                 status = ops->recover_open(sp, state);
1265                 if (status >= 0) {
1266                         status = nfs4_reclaim_locks(state, ops);
1267                         if (status >= 0) {
1268                                 spin_lock(&state->state_lock);
1269                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1270                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
1271                                                 pr_warn_ratelimited("NFS: "
1272                                                         "%s: Lock reclaim "
1273                                                         "failed!\n", __func__);
1274                                 }
1275                                 spin_unlock(&state->state_lock);
1276                                 nfs4_put_open_state(state);
1277                                 goto restart;
1278                         }
1279                 }
1280                 switch (status) {
1281                         default:
1282                                 printk(KERN_ERR "NFS: %s: unhandled error %d. "
1283                                         "Zeroing state\n", __func__, status);
1284                         case -ENOENT:
1285                         case -ENOMEM:
1286                         case -ESTALE:
1287                                 /*
1288                                  * Open state on this file cannot be recovered
1289                                  * All we can do is revert to using the zero stateid.
1290                                  */
1291                                 memset(&state->stateid, 0,
1292                                         sizeof(state->stateid));
1293                                 /* Mark the file as being 'closed' */
1294                                 state->state = 0;
1295                                 break;
1296                         case -EKEYEXPIRED:
1297                                 /*
1298                                  * User RPCSEC_GSS context has expired.
1299                                  * We cannot recover this stateid now, so
1300                                  * skip it and allow recovery thread to
1301                                  * proceed.
1302                                  */
1303                                 break;
1304                         case -NFS4ERR_ADMIN_REVOKED:
1305                         case -NFS4ERR_STALE_STATEID:
1306                         case -NFS4ERR_BAD_STATEID:
1307                         case -NFS4ERR_RECLAIM_BAD:
1308                         case -NFS4ERR_RECLAIM_CONFLICT:
1309                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1310                                 break;
1311                         case -NFS4ERR_EXPIRED:
1312                         case -NFS4ERR_NO_GRACE:
1313                                 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1314                         case -NFS4ERR_STALE_CLIENTID:
1315                         case -NFS4ERR_BADSESSION:
1316                         case -NFS4ERR_BADSLOT:
1317                         case -NFS4ERR_BAD_HIGH_SLOT:
1318                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1319                                 goto out_err;
1320                 }
1321                 nfs4_put_open_state(state);
1322                 goto restart;
1323         }
1324         spin_unlock(&sp->so_lock);
1325         return 0;
1326 out_err:
1327         nfs4_put_open_state(state);
1328         return status;
1329 }
1330
1331 static void nfs4_clear_open_state(struct nfs4_state *state)
1332 {
1333         struct nfs4_lock_state *lock;
1334
1335         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1336         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1337         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1338         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1339         spin_lock(&state->state_lock);
1340         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1341                 lock->ls_seqid.flags = 0;
1342                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1343         }
1344         spin_unlock(&state->state_lock);
1345 }
1346
1347 static void nfs4_reset_seqids(struct nfs_server *server,
1348         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1349 {
1350         struct nfs_client *clp = server->nfs_client;
1351         struct nfs4_state_owner *sp;
1352         struct rb_node *pos;
1353         struct nfs4_state *state;
1354
1355         spin_lock(&clp->cl_lock);
1356         for (pos = rb_first(&server->state_owners);
1357              pos != NULL;
1358              pos = rb_next(pos)) {
1359                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1360                 sp->so_seqid.flags = 0;
1361                 spin_lock(&sp->so_lock);
1362                 list_for_each_entry(state, &sp->so_states, open_states) {
1363                         if (mark_reclaim(clp, state))
1364                                 nfs4_clear_open_state(state);
1365                 }
1366                 spin_unlock(&sp->so_lock);
1367         }
1368         spin_unlock(&clp->cl_lock);
1369 }
1370
1371 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1372         int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1373 {
1374         struct nfs_server *server;
1375
1376         rcu_read_lock();
1377         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1378                 nfs4_reset_seqids(server, mark_reclaim);
1379         rcu_read_unlock();
1380 }
1381
1382 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1383 {
1384         /* Mark all delegations for reclaim */
1385         nfs_delegation_mark_reclaim(clp);
1386         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1387 }
1388
1389 static void nfs4_reclaim_complete(struct nfs_client *clp,
1390                                  const struct nfs4_state_recovery_ops *ops)
1391 {
1392         /* Notify the server we're done reclaiming our state */
1393         if (ops->reclaim_complete)
1394                 (void)ops->reclaim_complete(clp);
1395 }
1396
1397 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1398 {
1399         struct nfs_client *clp = server->nfs_client;
1400         struct nfs4_state_owner *sp;
1401         struct rb_node *pos;
1402         struct nfs4_state *state;
1403
1404         spin_lock(&clp->cl_lock);
1405         for (pos = rb_first(&server->state_owners);
1406              pos != NULL;
1407              pos = rb_next(pos)) {
1408                 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1409                 spin_lock(&sp->so_lock);
1410                 list_for_each_entry(state, &sp->so_states, open_states) {
1411                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1412                                                 &state->flags))
1413                                 continue;
1414                         nfs4_state_mark_reclaim_nograce(clp, state);
1415                 }
1416                 spin_unlock(&sp->so_lock);
1417         }
1418         spin_unlock(&clp->cl_lock);
1419 }
1420
1421 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1422 {
1423         struct nfs_server *server;
1424
1425         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1426                 return 0;
1427
1428         rcu_read_lock();
1429         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1430                 nfs4_clear_reclaim_server(server);
1431         rcu_read_unlock();
1432
1433         nfs_delegation_reap_unclaimed(clp);
1434         return 1;
1435 }
1436
1437 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1438 {
1439         if (!nfs4_state_clear_reclaim_reboot(clp))
1440                 return;
1441         nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops);
1442 }
1443
1444 static void nfs_delegation_clear_all(struct nfs_client *clp)
1445 {
1446         nfs_delegation_mark_reclaim(clp);
1447         nfs_delegation_reap_unclaimed(clp);
1448 }
1449
1450 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1451 {
1452         nfs_delegation_clear_all(clp);
1453         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1454 }
1455
1456 static void nfs4_warn_keyexpired(const char *s)
1457 {
1458         printk_ratelimited(KERN_WARNING "Error: state manager"
1459                         " encountered RPCSEC_GSS session"
1460                         " expired against NFSv4 server %s.\n",
1461                         s);
1462 }
1463
1464 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1465 {
1466         switch (error) {
1467                 case 0:
1468                         break;
1469                 case -NFS4ERR_CB_PATH_DOWN:
1470                         nfs40_handle_cb_pathdown(clp);
1471                         break;
1472                 case -NFS4ERR_NO_GRACE:
1473                         nfs4_state_end_reclaim_reboot(clp);
1474                         break;
1475                 case -NFS4ERR_STALE_CLIENTID:
1476                 case -NFS4ERR_LEASE_MOVED:
1477                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1478                         nfs4_state_clear_reclaim_reboot(clp);
1479                         nfs4_state_start_reclaim_reboot(clp);
1480                         break;
1481                 case -NFS4ERR_EXPIRED:
1482                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1483                         nfs4_state_start_reclaim_nograce(clp);
1484                         break;
1485                 case -NFS4ERR_BADSESSION:
1486                 case -NFS4ERR_BADSLOT:
1487                 case -NFS4ERR_BAD_HIGH_SLOT:
1488                 case -NFS4ERR_DEADSESSION:
1489                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1490                 case -NFS4ERR_SEQ_FALSE_RETRY:
1491                 case -NFS4ERR_SEQ_MISORDERED:
1492                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1493                         /* Zero session reset errors */
1494                         break;
1495                 case -EKEYEXPIRED:
1496                         /* Nothing we can do */
1497                         nfs4_warn_keyexpired(clp->cl_hostname);
1498                         break;
1499                 default:
1500                         return error;
1501         }
1502         return 0;
1503 }
1504
1505 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1506 {
1507         struct nfs4_state_owner *sp;
1508         struct nfs_server *server;
1509         struct rb_node *pos;
1510         int status = 0;
1511
1512 restart:
1513         rcu_read_lock();
1514         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1515                 nfs4_purge_state_owners(server);
1516                 spin_lock(&clp->cl_lock);
1517                 for (pos = rb_first(&server->state_owners);
1518                      pos != NULL;
1519                      pos = rb_next(pos)) {
1520                         sp = rb_entry(pos,
1521                                 struct nfs4_state_owner, so_server_node);
1522                         if (!test_and_clear_bit(ops->owner_flag_bit,
1523                                                         &sp->so_flags))
1524                                 continue;
1525                         atomic_inc(&sp->so_count);
1526                         spin_unlock(&clp->cl_lock);
1527                         rcu_read_unlock();
1528
1529                         status = nfs4_reclaim_open_state(sp, ops);
1530                         if (status < 0) {
1531                                 set_bit(ops->owner_flag_bit, &sp->so_flags);
1532                                 nfs4_put_state_owner(sp);
1533                                 return nfs4_recovery_handle_error(clp, status);
1534                         }
1535
1536                         nfs4_put_state_owner(sp);
1537                         goto restart;
1538                 }
1539                 spin_unlock(&clp->cl_lock);
1540         }
1541         rcu_read_unlock();
1542         return status;
1543 }
1544
1545 static int nfs4_check_lease(struct nfs_client *clp)
1546 {
1547         struct rpc_cred *cred;
1548         const struct nfs4_state_maintenance_ops *ops =
1549                 clp->cl_mvops->state_renewal_ops;
1550         int status;
1551
1552         /* Is the client already known to have an expired lease? */
1553         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1554                 return 0;
1555         spin_lock(&clp->cl_lock);
1556         cred = ops->get_state_renewal_cred_locked(clp);
1557         spin_unlock(&clp->cl_lock);
1558         if (cred == NULL) {
1559                 cred = nfs4_get_setclientid_cred(clp);
1560                 status = -ENOKEY;
1561                 if (cred == NULL)
1562                         goto out;
1563         }
1564         status = ops->renew_lease(clp, cred);
1565         put_rpccred(cred);
1566 out:
1567         return nfs4_recovery_handle_error(clp, status);
1568 }
1569
1570 static int nfs4_reclaim_lease(struct nfs_client *clp)
1571 {
1572         struct rpc_cred *cred;
1573         const struct nfs4_state_recovery_ops *ops =
1574                 clp->cl_mvops->reboot_recovery_ops;
1575         int status = -ENOENT;
1576
1577         cred = ops->get_clid_cred(clp);
1578         if (cred != NULL) {
1579                 status = ops->establish_clid(clp, cred);
1580                 put_rpccred(cred);
1581                 /* Handle case where the user hasn't set up machine creds */
1582                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1583                         nfs4_clear_machine_cred(clp);
1584                         status = -EAGAIN;
1585                 }
1586                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1587                         status = -EPROTONOSUPPORT;
1588         }
1589         return status;
1590 }
1591
1592 #ifdef CONFIG_NFS_V4_1
1593 void nfs4_schedule_session_recovery(struct nfs4_session *session)
1594 {
1595         struct nfs_client *clp = session->clp;
1596
1597         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1598         nfs4_schedule_lease_recovery(clp);
1599 }
1600 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
1601
1602 void nfs41_handle_recall_slot(struct nfs_client *clp)
1603 {
1604         set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1605         nfs4_schedule_state_manager(clp);
1606 }
1607
1608 static void nfs4_reset_all_state(struct nfs_client *clp)
1609 {
1610         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1611                 clp->cl_boot_time = CURRENT_TIME;
1612                 nfs4_state_start_reclaim_nograce(clp);
1613                 nfs4_schedule_state_manager(clp);
1614         }
1615 }
1616
1617 static void nfs41_handle_server_reboot(struct nfs_client *clp)
1618 {
1619         if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
1620                 nfs4_state_start_reclaim_reboot(clp);
1621                 nfs4_schedule_state_manager(clp);
1622         }
1623 }
1624
1625 static void nfs41_handle_state_revoked(struct nfs_client *clp)
1626 {
1627         /* Temporary */
1628         nfs4_reset_all_state(clp);
1629 }
1630
1631 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
1632 {
1633         /* This will need to handle layouts too */
1634         nfs_expire_all_delegations(clp);
1635 }
1636
1637 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
1638 {
1639         nfs_expire_all_delegations(clp);
1640         if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0)
1641                 nfs4_schedule_state_manager(clp);
1642 }
1643
1644 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
1645 {
1646         if (!flags)
1647                 return;
1648         if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
1649                 nfs41_handle_server_reboot(clp);
1650         if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED |
1651                             SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
1652                             SEQ4_STATUS_ADMIN_STATE_REVOKED |
1653                             SEQ4_STATUS_LEASE_MOVED))
1654                 nfs41_handle_state_revoked(clp);
1655         if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
1656                 nfs41_handle_recallable_state_revoked(clp);
1657         if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
1658                             SEQ4_STATUS_BACKCHANNEL_FAULT |
1659                             SEQ4_STATUS_CB_PATH_DOWN_SESSION))
1660                 nfs41_handle_cb_path_down(clp);
1661 }
1662
1663 static int nfs4_reset_session(struct nfs_client *clp)
1664 {
1665         int status;
1666
1667         nfs4_begin_drain_session(clp);
1668         status = nfs4_proc_destroy_session(clp->cl_session);
1669         if (status && status != -NFS4ERR_BADSESSION &&
1670             status != -NFS4ERR_DEADSESSION) {
1671                 status = nfs4_recovery_handle_error(clp, status);
1672                 goto out;
1673         }
1674
1675         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1676         status = nfs4_proc_create_session(clp);
1677         if (status) {
1678                 status = nfs4_recovery_handle_error(clp, status);
1679                 goto out;
1680         }
1681         clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1682         /* create_session negotiated new slot table */
1683         clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
1684
1685          /* Let the state manager reestablish state */
1686         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1687                 nfs41_setup_state_renewal(clp);
1688 out:
1689         return status;
1690 }
1691
1692 static int nfs4_recall_slot(struct nfs_client *clp)
1693 {
1694         struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
1695         struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
1696         struct nfs4_slot *new, *old;
1697         int i;
1698
1699         nfs4_begin_drain_session(clp);
1700         new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
1701                       GFP_NOFS);
1702         if (!new)
1703                 return -ENOMEM;
1704
1705         spin_lock(&fc_tbl->slot_tbl_lock);
1706         for (i = 0; i < fc_tbl->target_max_slots; i++)
1707                 new[i].seq_nr = fc_tbl->slots[i].seq_nr;
1708         old = fc_tbl->slots;
1709         fc_tbl->slots = new;
1710         fc_tbl->max_slots = fc_tbl->target_max_slots;
1711         fc_tbl->target_max_slots = 0;
1712         fc_attrs->max_reqs = fc_tbl->max_slots;
1713         spin_unlock(&fc_tbl->slot_tbl_lock);
1714
1715         kfree(old);
1716         nfs4_end_drain_session(clp);
1717         return 0;
1718 }
1719
1720 #else /* CONFIG_NFS_V4_1 */
1721 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1722 static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
1723 static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
1724 #endif /* CONFIG_NFS_V4_1 */
1725
1726 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1727  * on EXCHANGE_ID for v4.1
1728  */
1729 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1730 {
1731         switch (status) {
1732         case -NFS4ERR_CLID_INUSE:
1733         case -NFS4ERR_STALE_CLIENTID:
1734                 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1735                 break;
1736         case -NFS4ERR_DELAY:
1737         case -ETIMEDOUT:
1738         case -EAGAIN:
1739                 ssleep(1);
1740                 break;
1741
1742         case -EKEYEXPIRED:
1743                 nfs4_warn_keyexpired(clp->cl_hostname);
1744         case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1745                                  * in nfs4_exchange_id */
1746         default:
1747                 return;
1748         }
1749         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1750 }
1751
1752 static void nfs4_state_manager(struct nfs_client *clp)
1753 {
1754         int status = 0;
1755
1756         /* Ensure exclusive access to NFSv4 state */
1757         do {
1758                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1759                         /* We're going to have to re-establish a clientid */
1760                         status = nfs4_reclaim_lease(clp);
1761                         if (status) {
1762                                 nfs4_set_lease_expired(clp, status);
1763                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1764                                                         &clp->cl_state))
1765                                         continue;
1766                                 if (clp->cl_cons_state ==
1767                                                         NFS_CS_SESSION_INITING)
1768                                         nfs_mark_client_ready(clp, status);
1769                                 goto out_error;
1770                         }
1771                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1772
1773                         if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH,
1774                                                &clp->cl_state))
1775                                 nfs4_state_start_reclaim_nograce(clp);
1776                         else
1777                                 set_bit(NFS4CLNT_RECLAIM_REBOOT,
1778                                         &clp->cl_state);
1779
1780                         pnfs_destroy_all_layouts(clp);
1781                 }
1782
1783                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1784                         status = nfs4_check_lease(clp);
1785                         if (status < 0)
1786                                 goto out_error;
1787                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1788                                 continue;
1789                 }
1790
1791                 /* Initialize or reset the session */
1792                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1793                    && nfs4_has_session(clp)) {
1794                         status = nfs4_reset_session(clp);
1795                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1796                                 continue;
1797                         if (status < 0)
1798                                 goto out_error;
1799                 }
1800
1801                 /* First recover reboot state... */
1802                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1803                         status = nfs4_do_reclaim(clp,
1804                                 clp->cl_mvops->reboot_recovery_ops);
1805                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1806                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1807                                 continue;
1808                         nfs4_state_end_reclaim_reboot(clp);
1809                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1810                                 continue;
1811                         if (status < 0)
1812                                 goto out_error;
1813                 }
1814
1815                 /* Now recover expired state... */
1816                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1817                         status = nfs4_do_reclaim(clp,
1818                                 clp->cl_mvops->nograce_recovery_ops);
1819                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1820                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1821                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1822                                 continue;
1823                         if (status < 0)
1824                                 goto out_error;
1825                 }
1826
1827                 nfs4_end_drain_session(clp);
1828                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1829                         nfs_client_return_marked_delegations(clp);
1830                         continue;
1831                 }
1832                 /* Recall session slots */
1833                 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
1834                    && nfs4_has_session(clp)) {
1835                         status = nfs4_recall_slot(clp);
1836                         if (status < 0)
1837                                 goto out_error;
1838                         continue;
1839                 }
1840
1841
1842                 nfs4_clear_state_manager_bit(clp);
1843                 /* Did we race with an attempt to give us more work? */
1844                 if (clp->cl_state == 0)
1845                         break;
1846                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1847                         break;
1848         } while (atomic_read(&clp->cl_count) > 1);
1849         return;
1850 out_error:
1851         pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s"
1852                         " with error %d\n", clp->cl_hostname, -status);
1853         nfs4_end_drain_session(clp);
1854         nfs4_clear_state_manager_bit(clp);
1855 }
1856
1857 static int nfs4_run_state_manager(void *ptr)
1858 {
1859         struct nfs_client *clp = ptr;
1860
1861         allow_signal(SIGKILL);
1862         nfs4_state_manager(clp);
1863         nfs_put_client(clp);
1864         module_put_and_exit(0);
1865         return 0;
1866 }
1867
1868 /*
1869  * Local variables:
1870  *  c-basic-offset: 8
1871  * End:
1872  */