nfs41: only state manager sets NFS4CLNT_SESSION_SETUP
[linux-2.6.git] / fs / nfs / nfs4state.c
1 /*
2  *  fs/nfs/nfs4state.c
3  *
4  *  Client-side XDR for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *
11  *  Redistribution and use in source and binary forms, with or without
12  *  modification, are permitted provided that the following conditions
13  *  are met:
14  *
15  *  1. Redistributions of source code must retain the above copyright
16  *     notice, this list of conditions and the following disclaimer.
17  *  2. Redistributions in binary form must reproduce the above copyright
18  *     notice, this list of conditions and the following disclaimer in the
19  *     documentation and/or other materials provided with the distribution.
20  *  3. Neither the name of the University nor the names of its
21  *     contributors may be used to endorse or promote products derived
22  *     from this software without specific prior written permission.
23  *
24  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35  *
36  * Implementation of the NFSv4 state model.  For the time being,
37  * this is minimal, but will be made much more complex in a
38  * subsequent patch.
39  */
40
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
43 #include <linux/smp_lock.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/kthread.h>
47 #include <linux/module.h>
48 #include <linux/random.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51
52 #include "nfs4_fs.h"
53 #include "callback.h"
54 #include "delegation.h"
55 #include "internal.h"
56
57 #define OPENOWNER_POOL_SIZE     8
58
59 const nfs4_stateid zero_stateid;
60
61 static LIST_HEAD(nfs4_clientid_list);
62
63 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
64 {
65         unsigned short port;
66         int status;
67
68         port = nfs_callback_tcpport;
69         if (clp->cl_addr.ss_family == AF_INET6)
70                 port = nfs_callback_tcpport6;
71
72         status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred);
73         if (status == 0)
74                 status = nfs4_proc_setclientid_confirm(clp, cred);
75         if (status == 0)
76                 nfs4_schedule_state_renewal(clp);
77         return status;
78 }
79
80 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
81 {
82         struct rpc_cred *cred = NULL;
83
84         if (clp->cl_machine_cred != NULL)
85                 cred = get_rpccred(clp->cl_machine_cred);
86         return cred;
87 }
88
89 static void nfs4_clear_machine_cred(struct nfs_client *clp)
90 {
91         struct rpc_cred *cred;
92
93         spin_lock(&clp->cl_lock);
94         cred = clp->cl_machine_cred;
95         clp->cl_machine_cred = NULL;
96         spin_unlock(&clp->cl_lock);
97         if (cred != NULL)
98                 put_rpccred(cred);
99 }
100
101 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
102 {
103         struct nfs4_state_owner *sp;
104         struct rb_node *pos;
105         struct rpc_cred *cred = NULL;
106
107         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
108                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
109                 if (list_empty(&sp->so_states))
110                         continue;
111                 cred = get_rpccred(sp->so_cred);
112                 break;
113         }
114         return cred;
115 }
116
117 #if defined(CONFIG_NFS_V4_1)
118
119 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
120 {
121         int status;
122
123         status = nfs4_proc_exchange_id(clp, cred);
124         if (status == 0)
125                 /* create session schedules state renewal upon success */
126                 status = nfs4_proc_create_session(clp, 0);
127         if (status == 0)
128                 nfs_mark_client_ready(clp, NFS_CS_READY);
129         return status;
130 }
131
132 struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp)
133 {
134         struct rpc_cred *cred;
135
136         spin_lock(&clp->cl_lock);
137         cred = nfs4_get_machine_cred_locked(clp);
138         spin_unlock(&clp->cl_lock);
139         return cred;
140 }
141
142 #endif /* CONFIG_NFS_V4_1 */
143
144 struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
145 {
146         struct nfs4_state_owner *sp;
147         struct rb_node *pos;
148         struct rpc_cred *cred;
149
150         spin_lock(&clp->cl_lock);
151         cred = nfs4_get_machine_cred_locked(clp);
152         if (cred != NULL)
153                 goto out;
154         pos = rb_first(&clp->cl_state_owners);
155         if (pos != NULL) {
156                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
157                 cred = get_rpccred(sp->so_cred);
158         }
159 out:
160         spin_unlock(&clp->cl_lock);
161         return cred;
162 }
163
164 static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new,
165                 __u64 minval, int maxbits)
166 {
167         struct rb_node **p, *parent;
168         struct nfs_unique_id *pos;
169         __u64 mask = ~0ULL;
170
171         if (maxbits < 64)
172                 mask = (1ULL << maxbits) - 1ULL;
173
174         /* Ensure distribution is more or less flat */
175         get_random_bytes(&new->id, sizeof(new->id));
176         new->id &= mask;
177         if (new->id < minval)
178                 new->id += minval;
179 retry:
180         p = &root->rb_node;
181         parent = NULL;
182
183         while (*p != NULL) {
184                 parent = *p;
185                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
186
187                 if (new->id < pos->id)
188                         p = &(*p)->rb_left;
189                 else if (new->id > pos->id)
190                         p = &(*p)->rb_right;
191                 else
192                         goto id_exists;
193         }
194         rb_link_node(&new->rb_node, parent, p);
195         rb_insert_color(&new->rb_node, root);
196         return;
197 id_exists:
198         for (;;) {
199                 new->id++;
200                 if (new->id < minval || (new->id & mask) != new->id) {
201                         new->id = minval;
202                         break;
203                 }
204                 parent = rb_next(parent);
205                 if (parent == NULL)
206                         break;
207                 pos = rb_entry(parent, struct nfs_unique_id, rb_node);
208                 if (new->id < pos->id)
209                         break;
210         }
211         goto retry;
212 }
213
214 static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id)
215 {
216         rb_erase(&id->rb_node, root);
217 }
218
219 static struct nfs4_state_owner *
220 nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred)
221 {
222         struct nfs_client *clp = server->nfs_client;
223         struct rb_node **p = &clp->cl_state_owners.rb_node,
224                        *parent = NULL;
225         struct nfs4_state_owner *sp, *res = NULL;
226
227         while (*p != NULL) {
228                 parent = *p;
229                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
230
231                 if (server < sp->so_server) {
232                         p = &parent->rb_left;
233                         continue;
234                 }
235                 if (server > sp->so_server) {
236                         p = &parent->rb_right;
237                         continue;
238                 }
239                 if (cred < sp->so_cred)
240                         p = &parent->rb_left;
241                 else if (cred > sp->so_cred)
242                         p = &parent->rb_right;
243                 else {
244                         atomic_inc(&sp->so_count);
245                         res = sp;
246                         break;
247                 }
248         }
249         return res;
250 }
251
252 static struct nfs4_state_owner *
253 nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new)
254 {
255         struct rb_node **p = &clp->cl_state_owners.rb_node,
256                        *parent = NULL;
257         struct nfs4_state_owner *sp;
258
259         while (*p != NULL) {
260                 parent = *p;
261                 sp = rb_entry(parent, struct nfs4_state_owner, so_client_node);
262
263                 if (new->so_server < sp->so_server) {
264                         p = &parent->rb_left;
265                         continue;
266                 }
267                 if (new->so_server > sp->so_server) {
268                         p = &parent->rb_right;
269                         continue;
270                 }
271                 if (new->so_cred < sp->so_cred)
272                         p = &parent->rb_left;
273                 else if (new->so_cred > sp->so_cred)
274                         p = &parent->rb_right;
275                 else {
276                         atomic_inc(&sp->so_count);
277                         return sp;
278                 }
279         }
280         nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64);
281         rb_link_node(&new->so_client_node, parent, p);
282         rb_insert_color(&new->so_client_node, &clp->cl_state_owners);
283         return new;
284 }
285
286 static void
287 nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp)
288 {
289         if (!RB_EMPTY_NODE(&sp->so_client_node))
290                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
291         nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id);
292 }
293
294 /*
295  * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
296  * create a new state_owner.
297  *
298  */
299 static struct nfs4_state_owner *
300 nfs4_alloc_state_owner(void)
301 {
302         struct nfs4_state_owner *sp;
303
304         sp = kzalloc(sizeof(*sp),GFP_KERNEL);
305         if (!sp)
306                 return NULL;
307         spin_lock_init(&sp->so_lock);
308         INIT_LIST_HEAD(&sp->so_states);
309         INIT_LIST_HEAD(&sp->so_delegations);
310         rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
311         sp->so_seqid.sequence = &sp->so_sequence;
312         spin_lock_init(&sp->so_sequence.lock);
313         INIT_LIST_HEAD(&sp->so_sequence.list);
314         atomic_set(&sp->so_count, 1);
315         return sp;
316 }
317
318 static void
319 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
320 {
321         if (!RB_EMPTY_NODE(&sp->so_client_node)) {
322                 struct nfs_client *clp = sp->so_client;
323
324                 spin_lock(&clp->cl_lock);
325                 rb_erase(&sp->so_client_node, &clp->cl_state_owners);
326                 RB_CLEAR_NODE(&sp->so_client_node);
327                 spin_unlock(&clp->cl_lock);
328         }
329 }
330
331 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred)
332 {
333         struct nfs_client *clp = server->nfs_client;
334         struct nfs4_state_owner *sp, *new;
335
336         spin_lock(&clp->cl_lock);
337         sp = nfs4_find_state_owner(server, cred);
338         spin_unlock(&clp->cl_lock);
339         if (sp != NULL)
340                 return sp;
341         new = nfs4_alloc_state_owner();
342         if (new == NULL)
343                 return NULL;
344         new->so_client = clp;
345         new->so_server = server;
346         new->so_cred = cred;
347         spin_lock(&clp->cl_lock);
348         sp = nfs4_insert_state_owner(clp, new);
349         spin_unlock(&clp->cl_lock);
350         if (sp == new)
351                 get_rpccred(cred);
352         else {
353                 rpc_destroy_wait_queue(&new->so_sequence.wait);
354                 kfree(new);
355         }
356         return sp;
357 }
358
359 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
360 {
361         struct nfs_client *clp = sp->so_client;
362         struct rpc_cred *cred = sp->so_cred;
363
364         if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
365                 return;
366         nfs4_remove_state_owner(clp, sp);
367         spin_unlock(&clp->cl_lock);
368         rpc_destroy_wait_queue(&sp->so_sequence.wait);
369         put_rpccred(cred);
370         kfree(sp);
371 }
372
373 static struct nfs4_state *
374 nfs4_alloc_open_state(void)
375 {
376         struct nfs4_state *state;
377
378         state = kzalloc(sizeof(*state), GFP_KERNEL);
379         if (!state)
380                 return NULL;
381         atomic_set(&state->count, 1);
382         INIT_LIST_HEAD(&state->lock_states);
383         spin_lock_init(&state->state_lock);
384         seqlock_init(&state->seqlock);
385         return state;
386 }
387
388 void
389 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
390 {
391         if (state->state == fmode)
392                 return;
393         /* NB! List reordering - see the reclaim code for why.  */
394         if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
395                 if (fmode & FMODE_WRITE)
396                         list_move(&state->open_states, &state->owner->so_states);
397                 else
398                         list_move_tail(&state->open_states, &state->owner->so_states);
399         }
400         state->state = fmode;
401 }
402
403 static struct nfs4_state *
404 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
405 {
406         struct nfs_inode *nfsi = NFS_I(inode);
407         struct nfs4_state *state;
408
409         list_for_each_entry(state, &nfsi->open_states, inode_states) {
410                 if (state->owner != owner)
411                         continue;
412                 if (atomic_inc_not_zero(&state->count))
413                         return state;
414         }
415         return NULL;
416 }
417
418 static void
419 nfs4_free_open_state(struct nfs4_state *state)
420 {
421         kfree(state);
422 }
423
424 struct nfs4_state *
425 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
426 {
427         struct nfs4_state *state, *new;
428         struct nfs_inode *nfsi = NFS_I(inode);
429
430         spin_lock(&inode->i_lock);
431         state = __nfs4_find_state_byowner(inode, owner);
432         spin_unlock(&inode->i_lock);
433         if (state)
434                 goto out;
435         new = nfs4_alloc_open_state();
436         spin_lock(&owner->so_lock);
437         spin_lock(&inode->i_lock);
438         state = __nfs4_find_state_byowner(inode, owner);
439         if (state == NULL && new != NULL) {
440                 state = new;
441                 state->owner = owner;
442                 atomic_inc(&owner->so_count);
443                 list_add(&state->inode_states, &nfsi->open_states);
444                 state->inode = igrab(inode);
445                 spin_unlock(&inode->i_lock);
446                 /* Note: The reclaim code dictates that we add stateless
447                  * and read-only stateids to the end of the list */
448                 list_add_tail(&state->open_states, &owner->so_states);
449                 spin_unlock(&owner->so_lock);
450         } else {
451                 spin_unlock(&inode->i_lock);
452                 spin_unlock(&owner->so_lock);
453                 if (new)
454                         nfs4_free_open_state(new);
455         }
456 out:
457         return state;
458 }
459
460 void nfs4_put_open_state(struct nfs4_state *state)
461 {
462         struct inode *inode = state->inode;
463         struct nfs4_state_owner *owner = state->owner;
464
465         if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
466                 return;
467         spin_lock(&inode->i_lock);
468         list_del(&state->inode_states);
469         list_del(&state->open_states);
470         spin_unlock(&inode->i_lock);
471         spin_unlock(&owner->so_lock);
472         iput(inode);
473         nfs4_free_open_state(state);
474         nfs4_put_state_owner(owner);
475 }
476
477 /*
478  * Close the current file.
479  */
480 static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait)
481 {
482         struct nfs4_state_owner *owner = state->owner;
483         int call_close = 0;
484         fmode_t newstate;
485
486         atomic_inc(&owner->so_count);
487         /* Protect against nfs4_find_state() */
488         spin_lock(&owner->so_lock);
489         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
490                 case FMODE_READ:
491                         state->n_rdonly--;
492                         break;
493                 case FMODE_WRITE:
494                         state->n_wronly--;
495                         break;
496                 case FMODE_READ|FMODE_WRITE:
497                         state->n_rdwr--;
498         }
499         newstate = FMODE_READ|FMODE_WRITE;
500         if (state->n_rdwr == 0) {
501                 if (state->n_rdonly == 0) {
502                         newstate &= ~FMODE_READ;
503                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
504                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
505                 }
506                 if (state->n_wronly == 0) {
507                         newstate &= ~FMODE_WRITE;
508                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
509                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
510                 }
511                 if (newstate == 0)
512                         clear_bit(NFS_DELEGATED_STATE, &state->flags);
513         }
514         nfs4_state_set_mode_locked(state, newstate);
515         spin_unlock(&owner->so_lock);
516
517         if (!call_close) {
518                 nfs4_put_open_state(state);
519                 nfs4_put_state_owner(owner);
520         } else
521                 nfs4_do_close(path, state, wait);
522 }
523
524 void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode)
525 {
526         __nfs4_close(path, state, fmode, 0);
527 }
528
529 void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode)
530 {
531         __nfs4_close(path, state, fmode, 1);
532 }
533
534 /*
535  * Search the state->lock_states for an existing lock_owner
536  * that is compatible with current->files
537  */
538 static struct nfs4_lock_state *
539 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
540 {
541         struct nfs4_lock_state *pos;
542         list_for_each_entry(pos, &state->lock_states, ls_locks) {
543                 if (pos->ls_owner != fl_owner)
544                         continue;
545                 atomic_inc(&pos->ls_count);
546                 return pos;
547         }
548         return NULL;
549 }
550
551 /*
552  * Return a compatible lock_state. If no initialized lock_state structure
553  * exists, return an uninitialized one.
554  *
555  */
556 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
557 {
558         struct nfs4_lock_state *lsp;
559         struct nfs_client *clp = state->owner->so_client;
560
561         lsp = kzalloc(sizeof(*lsp), GFP_KERNEL);
562         if (lsp == NULL)
563                 return NULL;
564         rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue");
565         spin_lock_init(&lsp->ls_sequence.lock);
566         INIT_LIST_HEAD(&lsp->ls_sequence.list);
567         lsp->ls_seqid.sequence = &lsp->ls_sequence;
568         atomic_set(&lsp->ls_count, 1);
569         lsp->ls_state = state;
570         lsp->ls_owner = fl_owner;
571         spin_lock(&clp->cl_lock);
572         nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64);
573         spin_unlock(&clp->cl_lock);
574         INIT_LIST_HEAD(&lsp->ls_locks);
575         return lsp;
576 }
577
578 static void nfs4_free_lock_state(struct nfs4_lock_state *lsp)
579 {
580         struct nfs_client *clp = lsp->ls_state->owner->so_client;
581
582         spin_lock(&clp->cl_lock);
583         nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id);
584         spin_unlock(&clp->cl_lock);
585         rpc_destroy_wait_queue(&lsp->ls_sequence.wait);
586         kfree(lsp);
587 }
588
589 /*
590  * Return a compatible lock_state. If no initialized lock_state structure
591  * exists, return an uninitialized one.
592  *
593  */
594 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
595 {
596         struct nfs4_lock_state *lsp, *new = NULL;
597         
598         for(;;) {
599                 spin_lock(&state->state_lock);
600                 lsp = __nfs4_find_lock_state(state, owner);
601                 if (lsp != NULL)
602                         break;
603                 if (new != NULL) {
604                         list_add(&new->ls_locks, &state->lock_states);
605                         set_bit(LK_STATE_IN_USE, &state->flags);
606                         lsp = new;
607                         new = NULL;
608                         break;
609                 }
610                 spin_unlock(&state->state_lock);
611                 new = nfs4_alloc_lock_state(state, owner);
612                 if (new == NULL)
613                         return NULL;
614         }
615         spin_unlock(&state->state_lock);
616         if (new != NULL)
617                 nfs4_free_lock_state(new);
618         return lsp;
619 }
620
621 /*
622  * Release reference to lock_state, and free it if we see that
623  * it is no longer in use
624  */
625 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
626 {
627         struct nfs4_state *state;
628
629         if (lsp == NULL)
630                 return;
631         state = lsp->ls_state;
632         if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
633                 return;
634         list_del(&lsp->ls_locks);
635         if (list_empty(&state->lock_states))
636                 clear_bit(LK_STATE_IN_USE, &state->flags);
637         spin_unlock(&state->state_lock);
638         nfs4_free_lock_state(lsp);
639 }
640
641 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
642 {
643         struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
644
645         dst->fl_u.nfs4_fl.owner = lsp;
646         atomic_inc(&lsp->ls_count);
647 }
648
649 static void nfs4_fl_release_lock(struct file_lock *fl)
650 {
651         nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
652 }
653
654 static const struct file_lock_operations nfs4_fl_lock_ops = {
655         .fl_copy_lock = nfs4_fl_copy_lock,
656         .fl_release_private = nfs4_fl_release_lock,
657 };
658
659 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
660 {
661         struct nfs4_lock_state *lsp;
662
663         if (fl->fl_ops != NULL)
664                 return 0;
665         lsp = nfs4_get_lock_state(state, fl->fl_owner);
666         if (lsp == NULL)
667                 return -ENOMEM;
668         fl->fl_u.nfs4_fl.owner = lsp;
669         fl->fl_ops = &nfs4_fl_lock_ops;
670         return 0;
671 }
672
673 /*
674  * Byte-range lock aware utility to initialize the stateid of read/write
675  * requests.
676  */
677 void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner)
678 {
679         struct nfs4_lock_state *lsp;
680         int seq;
681
682         do {
683                 seq = read_seqbegin(&state->seqlock);
684                 memcpy(dst, &state->stateid, sizeof(*dst));
685         } while (read_seqretry(&state->seqlock, seq));
686         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
687                 return;
688
689         spin_lock(&state->state_lock);
690         lsp = __nfs4_find_lock_state(state, fl_owner);
691         if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
692                 memcpy(dst, &lsp->ls_stateid, sizeof(*dst));
693         spin_unlock(&state->state_lock);
694         nfs4_put_lock_state(lsp);
695 }
696
697 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
698 {
699         struct nfs_seqid *new;
700
701         new = kmalloc(sizeof(*new), GFP_KERNEL);
702         if (new != NULL) {
703                 new->sequence = counter;
704                 INIT_LIST_HEAD(&new->list);
705         }
706         return new;
707 }
708
709 void nfs_free_seqid(struct nfs_seqid *seqid)
710 {
711         if (!list_empty(&seqid->list)) {
712                 struct rpc_sequence *sequence = seqid->sequence->sequence;
713
714                 spin_lock(&sequence->lock);
715                 list_del(&seqid->list);
716                 spin_unlock(&sequence->lock);
717                 rpc_wake_up(&sequence->wait);
718         }
719         kfree(seqid);
720 }
721
722 /*
723  * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
724  * failed with a seqid incrementing error -
725  * see comments nfs_fs.h:seqid_mutating_error()
726  */
727 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
728 {
729         BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid);
730         switch (status) {
731                 case 0:
732                         break;
733                 case -NFS4ERR_BAD_SEQID:
734                         if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
735                                 return;
736                         printk(KERN_WARNING "NFS: v4 server returned a bad"
737                                         " sequence-id error on an"
738                                         " unconfirmed sequence %p!\n",
739                                         seqid->sequence);
740                 case -NFS4ERR_STALE_CLIENTID:
741                 case -NFS4ERR_STALE_STATEID:
742                 case -NFS4ERR_BAD_STATEID:
743                 case -NFS4ERR_BADXDR:
744                 case -NFS4ERR_RESOURCE:
745                 case -NFS4ERR_NOFILEHANDLE:
746                         /* Non-seqid mutating errors */
747                         return;
748         };
749         /*
750          * Note: no locking needed as we are guaranteed to be first
751          * on the sequence list
752          */
753         seqid->sequence->counter++;
754 }
755
756 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
757 {
758         struct nfs4_state_owner *sp = container_of(seqid->sequence,
759                                         struct nfs4_state_owner, so_seqid);
760         struct nfs_server *server = sp->so_server;
761
762         if (status == -NFS4ERR_BAD_SEQID)
763                 nfs4_drop_state_owner(sp);
764         if (!nfs4_has_session(server->nfs_client))
765                 nfs_increment_seqid(status, seqid);
766 }
767
768 /*
769  * Increment the seqid if the LOCK/LOCKU succeeded, or
770  * failed with a seqid incrementing error -
771  * see comments nfs_fs.h:seqid_mutating_error()
772  */
773 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
774 {
775         nfs_increment_seqid(status, seqid);
776 }
777
778 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
779 {
780         struct rpc_sequence *sequence = seqid->sequence->sequence;
781         int status = 0;
782
783         spin_lock(&sequence->lock);
784         if (list_empty(&seqid->list))
785                 list_add_tail(&seqid->list, &sequence->list);
786         if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
787                 goto unlock;
788         rpc_sleep_on(&sequence->wait, task, NULL);
789         status = -EAGAIN;
790 unlock:
791         spin_unlock(&sequence->lock);
792         return status;
793 }
794
795 static int nfs4_run_state_manager(void *);
796
797 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
798 {
799         smp_mb__before_clear_bit();
800         clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
801         smp_mb__after_clear_bit();
802         wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
803         rpc_wake_up(&clp->cl_rpcwaitq);
804 }
805
806 /*
807  * Schedule the nfs_client asynchronous state management routine
808  */
809 void nfs4_schedule_state_manager(struct nfs_client *clp)
810 {
811         struct task_struct *task;
812
813         if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
814                 return;
815         __module_get(THIS_MODULE);
816         atomic_inc(&clp->cl_count);
817         task = kthread_run(nfs4_run_state_manager, clp, "%s-manager",
818                                 rpc_peeraddr2str(clp->cl_rpcclient,
819                                                         RPC_DISPLAY_ADDR));
820         if (!IS_ERR(task))
821                 return;
822         nfs4_clear_state_manager_bit(clp);
823         nfs_put_client(clp);
824         module_put(THIS_MODULE);
825 }
826
827 /*
828  * Schedule a state recovery attempt
829  */
830 void nfs4_schedule_state_recovery(struct nfs_client *clp)
831 {
832         if (!clp)
833                 return;
834         if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
835                 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
836         nfs4_schedule_state_manager(clp);
837 }
838
839 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
840 {
841
842         set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
843         /* Don't recover state that expired before the reboot */
844         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
845                 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
846                 return 0;
847         }
848         set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
849         set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
850         return 1;
851 }
852
853 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
854 {
855         set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
856         clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
857         set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
858         set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
859         return 1;
860 }
861
862 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
863 {
864         struct inode *inode = state->inode;
865         struct nfs_inode *nfsi = NFS_I(inode);
866         struct file_lock *fl;
867         int status = 0;
868
869         if (inode->i_flock == NULL)
870                 return 0;
871
872         /* Guard against delegation returns and new lock/unlock calls */
873         down_write(&nfsi->rwsem);
874         /* Protect inode->i_flock using the BKL */
875         lock_kernel();
876         for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
877                 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
878                         continue;
879                 if (nfs_file_open_context(fl->fl_file)->state != state)
880                         continue;
881                 unlock_kernel();
882                 status = ops->recover_lock(state, fl);
883                 switch (status) {
884                         case 0:
885                                 break;
886                         case -ESTALE:
887                         case -NFS4ERR_ADMIN_REVOKED:
888                         case -NFS4ERR_STALE_STATEID:
889                         case -NFS4ERR_BAD_STATEID:
890                         case -NFS4ERR_EXPIRED:
891                         case -NFS4ERR_NO_GRACE:
892                         case -NFS4ERR_STALE_CLIENTID:
893                         case -NFS4ERR_BADSESSION:
894                         case -NFS4ERR_BADSLOT:
895                         case -NFS4ERR_BAD_HIGH_SLOT:
896                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
897                                 goto out;
898                         default:
899                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
900                                                 __func__, status);
901                         case -ENOMEM:
902                         case -NFS4ERR_DENIED:
903                         case -NFS4ERR_RECLAIM_BAD:
904                         case -NFS4ERR_RECLAIM_CONFLICT:
905                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
906                                 status = 0;
907                 }
908                 lock_kernel();
909         }
910         unlock_kernel();
911 out:
912         up_write(&nfsi->rwsem);
913         return status;
914 }
915
916 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
917 {
918         struct nfs4_state *state;
919         struct nfs4_lock_state *lock;
920         int status = 0;
921
922         /* Note: we rely on the sp->so_states list being ordered 
923          * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
924          * states first.
925          * This is needed to ensure that the server won't give us any
926          * read delegations that we have to return if, say, we are
927          * recovering after a network partition or a reboot from a
928          * server that doesn't support a grace period.
929          */
930 restart:
931         spin_lock(&sp->so_lock);
932         list_for_each_entry(state, &sp->so_states, open_states) {
933                 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
934                         continue;
935                 if (state->state == 0)
936                         continue;
937                 atomic_inc(&state->count);
938                 spin_unlock(&sp->so_lock);
939                 status = ops->recover_open(sp, state);
940                 if (status >= 0) {
941                         status = nfs4_reclaim_locks(state, ops);
942                         if (status >= 0) {
943                                 list_for_each_entry(lock, &state->lock_states, ls_locks) {
944                                         if (!(lock->ls_flags & NFS_LOCK_INITIALIZED))
945                                                 printk("%s: Lock reclaim failed!\n",
946                                                         __func__);
947                                 }
948                                 nfs4_put_open_state(state);
949                                 goto restart;
950                         }
951                 }
952                 switch (status) {
953                         default:
954                                 printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n",
955                                                 __func__, status);
956                         case -ENOENT:
957                         case -ENOMEM:
958                         case -ESTALE:
959                                 /*
960                                  * Open state on this file cannot be recovered
961                                  * All we can do is revert to using the zero stateid.
962                                  */
963                                 memset(state->stateid.data, 0,
964                                         sizeof(state->stateid.data));
965                                 /* Mark the file as being 'closed' */
966                                 state->state = 0;
967                                 break;
968                         case -NFS4ERR_ADMIN_REVOKED:
969                         case -NFS4ERR_STALE_STATEID:
970                         case -NFS4ERR_BAD_STATEID:
971                         case -NFS4ERR_RECLAIM_BAD:
972                         case -NFS4ERR_RECLAIM_CONFLICT:
973                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
974                                 break;
975                         case -NFS4ERR_EXPIRED:
976                         case -NFS4ERR_NO_GRACE:
977                                 nfs4_state_mark_reclaim_nograce(sp->so_client, state);
978                         case -NFS4ERR_STALE_CLIENTID:
979                         case -NFS4ERR_BADSESSION:
980                         case -NFS4ERR_BADSLOT:
981                         case -NFS4ERR_BAD_HIGH_SLOT:
982                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
983                                 goto out_err;
984                 }
985                 nfs4_put_open_state(state);
986                 goto restart;
987         }
988         spin_unlock(&sp->so_lock);
989         return 0;
990 out_err:
991         nfs4_put_open_state(state);
992         return status;
993 }
994
995 static void nfs4_clear_open_state(struct nfs4_state *state)
996 {
997         struct nfs4_lock_state *lock;
998
999         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1000         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1001         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1002         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1003         list_for_each_entry(lock, &state->lock_states, ls_locks) {
1004                 lock->ls_seqid.flags = 0;
1005                 lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
1006         }
1007 }
1008
1009 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1010 {
1011         struct nfs4_state_owner *sp;
1012         struct rb_node *pos;
1013         struct nfs4_state *state;
1014
1015         /* Reset all sequence ids to zero */
1016         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1017                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1018                 sp->so_seqid.flags = 0;
1019                 spin_lock(&sp->so_lock);
1020                 list_for_each_entry(state, &sp->so_states, open_states) {
1021                         if (mark_reclaim(clp, state))
1022                                 nfs4_clear_open_state(state);
1023                 }
1024                 spin_unlock(&sp->so_lock);
1025         }
1026 }
1027
1028 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1029 {
1030         /* Mark all delegations for reclaim */
1031         nfs_delegation_mark_reclaim(clp);
1032         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1033 }
1034
1035 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1036 {
1037         struct nfs4_state_owner *sp;
1038         struct rb_node *pos;
1039         struct nfs4_state *state;
1040
1041         if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1042                 return;
1043
1044         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1045                 sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1046                 spin_lock(&sp->so_lock);
1047                 list_for_each_entry(state, &sp->so_states, open_states) {
1048                         if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags))
1049                                 continue;
1050                         nfs4_state_mark_reclaim_nograce(clp, state);
1051                 }
1052                 spin_unlock(&sp->so_lock);
1053         }
1054
1055         nfs_delegation_reap_unclaimed(clp);
1056 }
1057
1058 static void nfs_delegation_clear_all(struct nfs_client *clp)
1059 {
1060         nfs_delegation_mark_reclaim(clp);
1061         nfs_delegation_reap_unclaimed(clp);
1062 }
1063
1064 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1065 {
1066         nfs_delegation_clear_all(clp);
1067         nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1068 }
1069
1070 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1071 {
1072         switch (error) {
1073                 case -NFS4ERR_CB_PATH_DOWN:
1074                         nfs_handle_cb_pathdown(clp);
1075                         return 0;
1076                 case -NFS4ERR_NO_GRACE:
1077                         nfs4_state_end_reclaim_reboot(clp);
1078                         return 0;
1079                 case -NFS4ERR_STALE_CLIENTID:
1080                 case -NFS4ERR_LEASE_MOVED:
1081                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1082                         nfs4_state_end_reclaim_reboot(clp);
1083                         nfs4_state_start_reclaim_reboot(clp);
1084                         break;
1085                 case -NFS4ERR_EXPIRED:
1086                         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1087                         nfs4_state_start_reclaim_nograce(clp);
1088                         break;
1089                 case -NFS4ERR_BADSESSION:
1090                 case -NFS4ERR_BADSLOT:
1091                 case -NFS4ERR_BAD_HIGH_SLOT:
1092                 case -NFS4ERR_DEADSESSION:
1093                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1094                 case -NFS4ERR_SEQ_FALSE_RETRY:
1095                 case -NFS4ERR_SEQ_MISORDERED:
1096                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1097                         /* Zero session reset errors */
1098                         return 0;
1099         }
1100         return error;
1101 }
1102
1103 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1104 {
1105         struct rb_node *pos;
1106         int status = 0;
1107
1108 restart:
1109         spin_lock(&clp->cl_lock);
1110         for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) {
1111                 struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node);
1112                 if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags))
1113                         continue;
1114                 atomic_inc(&sp->so_count);
1115                 spin_unlock(&clp->cl_lock);
1116                 status = nfs4_reclaim_open_state(sp, ops);
1117                 if (status < 0) {
1118                         set_bit(ops->owner_flag_bit, &sp->so_flags);
1119                         nfs4_put_state_owner(sp);
1120                         return nfs4_recovery_handle_error(clp, status);
1121                 }
1122                 nfs4_put_state_owner(sp);
1123                 goto restart;
1124         }
1125         spin_unlock(&clp->cl_lock);
1126         return status;
1127 }
1128
1129 static int nfs4_check_lease(struct nfs_client *clp)
1130 {
1131         struct rpc_cred *cred;
1132         struct nfs4_state_maintenance_ops *ops =
1133                 nfs4_state_renewal_ops[clp->cl_minorversion];
1134         int status = -NFS4ERR_EXPIRED;
1135
1136         /* Is the client already known to have an expired lease? */
1137         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1138                 return 0;
1139         spin_lock(&clp->cl_lock);
1140         cred = ops->get_state_renewal_cred_locked(clp);
1141         spin_unlock(&clp->cl_lock);
1142         if (cred == NULL) {
1143                 cred = nfs4_get_setclientid_cred(clp);
1144                 if (cred == NULL)
1145                         goto out;
1146         }
1147         status = ops->renew_lease(clp, cred);
1148         put_rpccred(cred);
1149 out:
1150         return nfs4_recovery_handle_error(clp, status);
1151 }
1152
1153 static int nfs4_reclaim_lease(struct nfs_client *clp)
1154 {
1155         struct rpc_cred *cred;
1156         struct nfs4_state_recovery_ops *ops =
1157                 nfs4_reboot_recovery_ops[clp->cl_minorversion];
1158         int status = -ENOENT;
1159
1160         cred = ops->get_clid_cred(clp);
1161         if (cred != NULL) {
1162                 status = ops->establish_clid(clp, cred);
1163                 put_rpccred(cred);
1164                 /* Handle case where the user hasn't set up machine creds */
1165                 if (status == -EACCES && cred == clp->cl_machine_cred) {
1166                         nfs4_clear_machine_cred(clp);
1167                         status = -EAGAIN;
1168                 }
1169                 if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
1170                         status = -EPROTONOSUPPORT;
1171         }
1172         return status;
1173 }
1174
1175 #ifdef CONFIG_NFS_V4_1
1176 static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
1177 {
1178         switch (err) {
1179         case -NFS4ERR_STALE_CLIENTID:
1180                 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1181         }
1182 }
1183
1184 static int nfs4_reset_session(struct nfs_client *clp)
1185 {
1186         struct nfs4_session *ses = clp->cl_session;
1187         struct nfs4_slot_table *tbl = &ses->fc_slot_table;
1188         int status;
1189
1190         INIT_COMPLETION(ses->complete);
1191         spin_lock(&tbl->slot_tbl_lock);
1192         if (tbl->highest_used_slotid != -1) {
1193                 set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
1194                 spin_unlock(&tbl->slot_tbl_lock);
1195                 status = wait_for_completion_interruptible(&ses->complete);
1196                 if (status) /* -ERESTARTSYS */
1197                         goto out;
1198         } else {
1199                 spin_unlock(&tbl->slot_tbl_lock);
1200         }
1201
1202         status = nfs4_proc_destroy_session(clp->cl_session);
1203         if (status && status != -NFS4ERR_BADSESSION &&
1204             status != -NFS4ERR_DEADSESSION) {
1205                 nfs4_session_recovery_handle_error(clp, status);
1206                 goto out;
1207         }
1208
1209         memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
1210         status = nfs4_proc_create_session(clp, 1);
1211         if (status)
1212                 nfs4_session_recovery_handle_error(clp, status);
1213                 /* fall through*/
1214 out:
1215         /* Wake up the next rpc task even on error */
1216         clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
1217         rpc_wake_up_next(&clp->cl_session->fc_slot_table.slot_tbl_waitq);
1218         return status;
1219 }
1220
1221 #else /* CONFIG_NFS_V4_1 */
1222 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
1223 #endif /* CONFIG_NFS_V4_1 */
1224
1225 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1226  * on EXCHANGE_ID for v4.1
1227  */
1228 static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
1229 {
1230         if (nfs4_has_session(clp)) {
1231                 switch (status) {
1232                 case -NFS4ERR_DELAY:
1233                 case -NFS4ERR_CLID_INUSE:
1234                 case -EAGAIN:
1235                         break;
1236
1237                 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1238                                          * in nfs4_exchange_id */
1239                 default:
1240                         return;
1241                 }
1242         }
1243         set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1244 }
1245
1246 static void nfs4_state_manager(struct nfs_client *clp)
1247 {
1248         int status = 0;
1249
1250         /* Ensure exclusive access to NFSv4 state */
1251         for(;;) {
1252                 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
1253                         /* We're going to have to re-establish a clientid */
1254                         status = nfs4_reclaim_lease(clp);
1255                         if (status) {
1256                                 nfs4_set_lease_expired(clp, status);
1257                                 if (test_bit(NFS4CLNT_LEASE_EXPIRED,
1258                                                         &clp->cl_state))
1259                                         continue;
1260                                 if (clp->cl_cons_state ==
1261                                                         NFS_CS_SESSION_INITING)
1262                                         nfs_mark_client_ready(clp, status);
1263                                 goto out_error;
1264                         }
1265                         clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1266                 }
1267
1268                 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
1269                         status = nfs4_check_lease(clp);
1270                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1271                                 continue;
1272                         if (status < 0 && status != -NFS4ERR_CB_PATH_DOWN)
1273                                 goto out_error;
1274                 }
1275
1276                 /* Initialize or reset the session */
1277                 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)
1278                    && nfs4_has_session(clp)) {
1279                         status = nfs4_reset_session(clp);
1280                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1281                                 continue;
1282                         if (status < 0)
1283                                 goto out_error;
1284                 }
1285
1286                 /* First recover reboot state... */
1287                 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
1288                         status = nfs4_do_reclaim(clp,
1289                                 nfs4_reboot_recovery_ops[clp->cl_minorversion]);
1290                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1291                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
1292                                 continue;
1293                         nfs4_state_end_reclaim_reboot(clp);
1294                         if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1295                                 continue;
1296                         if (status < 0)
1297                                 goto out_error;
1298                 }
1299
1300                 /* Now recover expired state... */
1301                 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
1302                         status = nfs4_do_reclaim(clp,
1303                                 nfs4_nograce_recovery_ops[clp->cl_minorversion]);
1304                         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) ||
1305                             test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) ||
1306                             test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1307                                 continue;
1308                         if (status < 0)
1309                                 goto out_error;
1310                 }
1311
1312                 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
1313                         nfs_client_return_marked_delegations(clp);
1314                         continue;
1315                 }
1316
1317                 nfs4_clear_state_manager_bit(clp);
1318                 /* Did we race with an attempt to give us more work? */
1319                 if (clp->cl_state == 0)
1320                         break;
1321                 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1322                         break;
1323         }
1324         return;
1325 out_error:
1326         printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
1327                         " with error %d\n", clp->cl_hostname, -status);
1328         nfs4_clear_state_manager_bit(clp);
1329 }
1330
1331 static int nfs4_run_state_manager(void *ptr)
1332 {
1333         struct nfs_client *clp = ptr;
1334
1335         allow_signal(SIGKILL);
1336         nfs4_state_manager(clp);
1337         nfs_put_client(clp);
1338         module_put_and_exit(0);
1339         return 0;
1340 }
1341
1342 /*
1343  * Local variables:
1344  *  c-basic-offset: 8
1345  * End:
1346  */