4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
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>
54 #include "delegation.h"
57 #define OPENOWNER_POOL_SIZE 8
59 const nfs4_stateid zero_stateid
;
61 static LIST_HEAD(nfs4_clientid_list
);
63 int nfs4_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
68 port
= nfs_callback_tcpport
;
69 if (clp
->cl_addr
.ss_family
== AF_INET6
)
70 port
= nfs_callback_tcpport6
;
72 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
);
74 status
= nfs4_proc_setclientid_confirm(clp
, cred
);
76 nfs4_schedule_state_renewal(clp
);
80 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
82 struct rpc_cred
*cred
= NULL
;
84 if (clp
->cl_machine_cred
!= NULL
)
85 cred
= get_rpccred(clp
->cl_machine_cred
);
89 static void nfs4_clear_machine_cred(struct nfs_client
*clp
)
91 struct rpc_cred
*cred
;
93 spin_lock(&clp
->cl_lock
);
94 cred
= clp
->cl_machine_cred
;
95 clp
->cl_machine_cred
= NULL
;
96 spin_unlock(&clp
->cl_lock
);
101 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
103 struct nfs4_state_owner
*sp
;
105 struct rpc_cred
*cred
= NULL
;
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
))
111 cred
= get_rpccred(sp
->so_cred
);
117 #if defined(CONFIG_NFS_V4_1)
119 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
122 struct nfs_fsinfo fsinfo
;
124 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
126 /* Update lease time and schedule renewal */
127 spin_lock(&clp
->cl_lock
);
128 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
129 clp
->cl_last_renewal
= jiffies
;
130 spin_unlock(&clp
->cl_lock
);
132 nfs4_schedule_state_renewal(clp
);
138 static void nfs4_end_drain_session(struct nfs_client
*clp
)
140 struct nfs4_session
*ses
= clp
->cl_session
;
143 if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING
, &clp
->cl_state
)) {
144 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
145 max_slots
= ses
->fc_slot_table
.max_slots
;
146 while (max_slots
--) {
147 struct rpc_task
*task
;
149 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
153 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
155 spin_unlock(&ses
->fc_slot_table
.slot_tbl_lock
);
159 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
161 struct nfs4_session
*ses
= clp
->cl_session
;
162 struct nfs4_slot_table
*tbl
= &ses
->fc_slot_table
;
164 spin_lock(&tbl
->slot_tbl_lock
);
165 set_bit(NFS4CLNT_SESSION_DRAINING
, &clp
->cl_state
);
166 if (tbl
->highest_used_slotid
!= -1) {
167 INIT_COMPLETION(ses
->complete
);
168 spin_unlock(&tbl
->slot_tbl_lock
);
169 return wait_for_completion_interruptible(&ses
->complete
);
171 spin_unlock(&tbl
->slot_tbl_lock
);
175 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
179 status
= nfs4_proc_exchange_id(clp
, cred
);
182 status
= nfs4_proc_create_session(clp
);
185 nfs41_setup_state_renewal(clp
);
186 nfs_mark_client_ready(clp
, NFS_CS_READY
);
191 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
193 struct rpc_cred
*cred
;
195 spin_lock(&clp
->cl_lock
);
196 cred
= nfs4_get_machine_cred_locked(clp
);
197 spin_unlock(&clp
->cl_lock
);
201 #endif /* CONFIG_NFS_V4_1 */
203 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
205 struct nfs4_state_owner
*sp
;
207 struct rpc_cred
*cred
;
209 spin_lock(&clp
->cl_lock
);
210 cred
= nfs4_get_machine_cred_locked(clp
);
213 pos
= rb_first(&clp
->cl_state_owners
);
215 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
216 cred
= get_rpccred(sp
->so_cred
);
219 spin_unlock(&clp
->cl_lock
);
223 static void nfs_alloc_unique_id(struct rb_root
*root
, struct nfs_unique_id
*new,
224 __u64 minval
, int maxbits
)
226 struct rb_node
**p
, *parent
;
227 struct nfs_unique_id
*pos
;
231 mask
= (1ULL << maxbits
) - 1ULL;
233 /* Ensure distribution is more or less flat */
234 get_random_bytes(&new->id
, sizeof(new->id
));
236 if (new->id
< minval
)
244 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
246 if (new->id
< pos
->id
)
248 else if (new->id
> pos
->id
)
253 rb_link_node(&new->rb_node
, parent
, p
);
254 rb_insert_color(&new->rb_node
, root
);
259 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
263 parent
= rb_next(parent
);
266 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
267 if (new->id
< pos
->id
)
273 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
275 rb_erase(&id
->rb_node
, root
);
278 static struct nfs4_state_owner
*
279 nfs4_find_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
281 struct nfs_client
*clp
= server
->nfs_client
;
282 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
284 struct nfs4_state_owner
*sp
, *res
= NULL
;
288 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
290 if (server
< sp
->so_server
) {
291 p
= &parent
->rb_left
;
294 if (server
> sp
->so_server
) {
295 p
= &parent
->rb_right
;
298 if (cred
< sp
->so_cred
)
299 p
= &parent
->rb_left
;
300 else if (cred
> sp
->so_cred
)
301 p
= &parent
->rb_right
;
303 atomic_inc(&sp
->so_count
);
311 static struct nfs4_state_owner
*
312 nfs4_insert_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*new)
314 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
316 struct nfs4_state_owner
*sp
;
320 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
322 if (new->so_server
< sp
->so_server
) {
323 p
= &parent
->rb_left
;
326 if (new->so_server
> sp
->so_server
) {
327 p
= &parent
->rb_right
;
330 if (new->so_cred
< sp
->so_cred
)
331 p
= &parent
->rb_left
;
332 else if (new->so_cred
> sp
->so_cred
)
333 p
= &parent
->rb_right
;
335 atomic_inc(&sp
->so_count
);
339 nfs_alloc_unique_id(&clp
->cl_openowner_id
, &new->so_owner_id
, 1, 64);
340 rb_link_node(&new->so_client_node
, parent
, p
);
341 rb_insert_color(&new->so_client_node
, &clp
->cl_state_owners
);
346 nfs4_remove_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*sp
)
348 if (!RB_EMPTY_NODE(&sp
->so_client_node
))
349 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
350 nfs_free_unique_id(&clp
->cl_openowner_id
, &sp
->so_owner_id
);
354 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
355 * create a new state_owner.
358 static struct nfs4_state_owner
*
359 nfs4_alloc_state_owner(void)
361 struct nfs4_state_owner
*sp
;
363 sp
= kzalloc(sizeof(*sp
),GFP_KERNEL
);
366 spin_lock_init(&sp
->so_lock
);
367 INIT_LIST_HEAD(&sp
->so_states
);
368 INIT_LIST_HEAD(&sp
->so_delegations
);
369 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
370 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
371 spin_lock_init(&sp
->so_sequence
.lock
);
372 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
373 atomic_set(&sp
->so_count
, 1);
378 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
380 if (!RB_EMPTY_NODE(&sp
->so_client_node
)) {
381 struct nfs_client
*clp
= sp
->so_client
;
383 spin_lock(&clp
->cl_lock
);
384 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
385 RB_CLEAR_NODE(&sp
->so_client_node
);
386 spin_unlock(&clp
->cl_lock
);
390 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
392 struct nfs_client
*clp
= server
->nfs_client
;
393 struct nfs4_state_owner
*sp
, *new;
395 spin_lock(&clp
->cl_lock
);
396 sp
= nfs4_find_state_owner(server
, cred
);
397 spin_unlock(&clp
->cl_lock
);
400 new = nfs4_alloc_state_owner();
403 new->so_client
= clp
;
404 new->so_server
= server
;
406 spin_lock(&clp
->cl_lock
);
407 sp
= nfs4_insert_state_owner(clp
, new);
408 spin_unlock(&clp
->cl_lock
);
412 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
418 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
420 struct nfs_client
*clp
= sp
->so_client
;
421 struct rpc_cred
*cred
= sp
->so_cred
;
423 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
425 nfs4_remove_state_owner(clp
, sp
);
426 spin_unlock(&clp
->cl_lock
);
427 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
432 static struct nfs4_state
*
433 nfs4_alloc_open_state(void)
435 struct nfs4_state
*state
;
437 state
= kzalloc(sizeof(*state
), GFP_KERNEL
);
440 atomic_set(&state
->count
, 1);
441 INIT_LIST_HEAD(&state
->lock_states
);
442 spin_lock_init(&state
->state_lock
);
443 seqlock_init(&state
->seqlock
);
448 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
450 if (state
->state
== fmode
)
452 /* NB! List reordering - see the reclaim code for why. */
453 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
454 if (fmode
& FMODE_WRITE
)
455 list_move(&state
->open_states
, &state
->owner
->so_states
);
457 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
459 state
->state
= fmode
;
462 static struct nfs4_state
*
463 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
465 struct nfs_inode
*nfsi
= NFS_I(inode
);
466 struct nfs4_state
*state
;
468 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
469 if (state
->owner
!= owner
)
471 if (atomic_inc_not_zero(&state
->count
))
478 nfs4_free_open_state(struct nfs4_state
*state
)
484 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
486 struct nfs4_state
*state
, *new;
487 struct nfs_inode
*nfsi
= NFS_I(inode
);
489 spin_lock(&inode
->i_lock
);
490 state
= __nfs4_find_state_byowner(inode
, owner
);
491 spin_unlock(&inode
->i_lock
);
494 new = nfs4_alloc_open_state();
495 spin_lock(&owner
->so_lock
);
496 spin_lock(&inode
->i_lock
);
497 state
= __nfs4_find_state_byowner(inode
, owner
);
498 if (state
== NULL
&& new != NULL
) {
500 state
->owner
= owner
;
501 atomic_inc(&owner
->so_count
);
502 list_add(&state
->inode_states
, &nfsi
->open_states
);
503 state
->inode
= igrab(inode
);
504 spin_unlock(&inode
->i_lock
);
505 /* Note: The reclaim code dictates that we add stateless
506 * and read-only stateids to the end of the list */
507 list_add_tail(&state
->open_states
, &owner
->so_states
);
508 spin_unlock(&owner
->so_lock
);
510 spin_unlock(&inode
->i_lock
);
511 spin_unlock(&owner
->so_lock
);
513 nfs4_free_open_state(new);
519 void nfs4_put_open_state(struct nfs4_state
*state
)
521 struct inode
*inode
= state
->inode
;
522 struct nfs4_state_owner
*owner
= state
->owner
;
524 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
526 spin_lock(&inode
->i_lock
);
527 list_del(&state
->inode_states
);
528 list_del(&state
->open_states
);
529 spin_unlock(&inode
->i_lock
);
530 spin_unlock(&owner
->so_lock
);
532 nfs4_free_open_state(state
);
533 nfs4_put_state_owner(owner
);
537 * Close the current file.
539 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
, int wait
)
541 struct nfs4_state_owner
*owner
= state
->owner
;
545 atomic_inc(&owner
->so_count
);
546 /* Protect against nfs4_find_state() */
547 spin_lock(&owner
->so_lock
);
548 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
555 case FMODE_READ
|FMODE_WRITE
:
558 newstate
= FMODE_READ
|FMODE_WRITE
;
559 if (state
->n_rdwr
== 0) {
560 if (state
->n_rdonly
== 0) {
561 newstate
&= ~FMODE_READ
;
562 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
563 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
565 if (state
->n_wronly
== 0) {
566 newstate
&= ~FMODE_WRITE
;
567 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
568 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
571 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
573 nfs4_state_set_mode_locked(state
, newstate
);
574 spin_unlock(&owner
->so_lock
);
577 nfs4_put_open_state(state
);
578 nfs4_put_state_owner(owner
);
580 nfs4_do_close(path
, state
, wait
);
583 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
585 __nfs4_close(path
, state
, fmode
, 0);
588 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
590 __nfs4_close(path
, state
, fmode
, 1);
594 * Search the state->lock_states for an existing lock_owner
595 * that is compatible with current->files
597 static struct nfs4_lock_state
*
598 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
600 struct nfs4_lock_state
*pos
;
601 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
602 if (pos
->ls_owner
!= fl_owner
)
604 atomic_inc(&pos
->ls_count
);
611 * Return a compatible lock_state. If no initialized lock_state structure
612 * exists, return an uninitialized one.
615 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
617 struct nfs4_lock_state
*lsp
;
618 struct nfs_client
*clp
= state
->owner
->so_client
;
620 lsp
= kzalloc(sizeof(*lsp
), GFP_KERNEL
);
623 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
624 spin_lock_init(&lsp
->ls_sequence
.lock
);
625 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
626 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
627 atomic_set(&lsp
->ls_count
, 1);
628 lsp
->ls_state
= state
;
629 lsp
->ls_owner
= fl_owner
;
630 spin_lock(&clp
->cl_lock
);
631 nfs_alloc_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
, 1, 64);
632 spin_unlock(&clp
->cl_lock
);
633 INIT_LIST_HEAD(&lsp
->ls_locks
);
637 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
639 struct nfs_client
*clp
= lsp
->ls_state
->owner
->so_client
;
641 spin_lock(&clp
->cl_lock
);
642 nfs_free_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
);
643 spin_unlock(&clp
->cl_lock
);
644 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
649 * Return a compatible lock_state. If no initialized lock_state structure
650 * exists, return an uninitialized one.
653 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
655 struct nfs4_lock_state
*lsp
, *new = NULL
;
658 spin_lock(&state
->state_lock
);
659 lsp
= __nfs4_find_lock_state(state
, owner
);
663 list_add(&new->ls_locks
, &state
->lock_states
);
664 set_bit(LK_STATE_IN_USE
, &state
->flags
);
669 spin_unlock(&state
->state_lock
);
670 new = nfs4_alloc_lock_state(state
, owner
);
674 spin_unlock(&state
->state_lock
);
676 nfs4_free_lock_state(new);
681 * Release reference to lock_state, and free it if we see that
682 * it is no longer in use
684 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
686 struct nfs4_state
*state
;
690 state
= lsp
->ls_state
;
691 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
693 list_del(&lsp
->ls_locks
);
694 if (list_empty(&state
->lock_states
))
695 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
696 spin_unlock(&state
->state_lock
);
697 nfs4_free_lock_state(lsp
);
700 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
702 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
704 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
705 atomic_inc(&lsp
->ls_count
);
708 static void nfs4_fl_release_lock(struct file_lock
*fl
)
710 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
713 static const struct file_lock_operations nfs4_fl_lock_ops
= {
714 .fl_copy_lock
= nfs4_fl_copy_lock
,
715 .fl_release_private
= nfs4_fl_release_lock
,
718 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
720 struct nfs4_lock_state
*lsp
;
722 if (fl
->fl_ops
!= NULL
)
724 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
727 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
728 fl
->fl_ops
= &nfs4_fl_lock_ops
;
733 * Byte-range lock aware utility to initialize the stateid of read/write
736 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
)
738 struct nfs4_lock_state
*lsp
;
742 seq
= read_seqbegin(&state
->seqlock
);
743 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
744 } while (read_seqretry(&state
->seqlock
, seq
));
745 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
748 spin_lock(&state
->state_lock
);
749 lsp
= __nfs4_find_lock_state(state
, fl_owner
);
750 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
751 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
752 spin_unlock(&state
->state_lock
);
753 nfs4_put_lock_state(lsp
);
756 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
)
758 struct nfs_seqid
*new;
760 new = kmalloc(sizeof(*new), GFP_KERNEL
);
762 new->sequence
= counter
;
763 INIT_LIST_HEAD(&new->list
);
768 void nfs_release_seqid(struct nfs_seqid
*seqid
)
770 if (!list_empty(&seqid
->list
)) {
771 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
773 spin_lock(&sequence
->lock
);
774 list_del_init(&seqid
->list
);
775 spin_unlock(&sequence
->lock
);
776 rpc_wake_up(&sequence
->wait
);
780 void nfs_free_seqid(struct nfs_seqid
*seqid
)
782 nfs_release_seqid(seqid
);
787 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
788 * failed with a seqid incrementing error -
789 * see comments nfs_fs.h:seqid_mutating_error()
791 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
793 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
797 case -NFS4ERR_BAD_SEQID
:
798 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
800 printk(KERN_WARNING
"NFS: v4 server returned a bad"
801 " sequence-id error on an"
802 " unconfirmed sequence %p!\n",
804 case -NFS4ERR_STALE_CLIENTID
:
805 case -NFS4ERR_STALE_STATEID
:
806 case -NFS4ERR_BAD_STATEID
:
807 case -NFS4ERR_BADXDR
:
808 case -NFS4ERR_RESOURCE
:
809 case -NFS4ERR_NOFILEHANDLE
:
810 /* Non-seqid mutating errors */
814 * Note: no locking needed as we are guaranteed to be first
815 * on the sequence list
817 seqid
->sequence
->counter
++;
820 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
822 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
823 struct nfs4_state_owner
, so_seqid
);
824 struct nfs_server
*server
= sp
->so_server
;
826 if (status
== -NFS4ERR_BAD_SEQID
)
827 nfs4_drop_state_owner(sp
);
828 if (!nfs4_has_session(server
->nfs_client
))
829 nfs_increment_seqid(status
, seqid
);
833 * Increment the seqid if the LOCK/LOCKU succeeded, or
834 * failed with a seqid incrementing error -
835 * see comments nfs_fs.h:seqid_mutating_error()
837 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
839 nfs_increment_seqid(status
, seqid
);
842 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
844 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
847 spin_lock(&sequence
->lock
);
848 if (list_empty(&seqid
->list
))
849 list_add_tail(&seqid
->list
, &sequence
->list
);
850 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
852 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
855 spin_unlock(&sequence
->lock
);
859 static int nfs4_run_state_manager(void *);
861 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
863 smp_mb__before_clear_bit();
864 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
865 smp_mb__after_clear_bit();
866 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
867 rpc_wake_up(&clp
->cl_rpcwaitq
);
871 * Schedule the nfs_client asynchronous state management routine
873 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
875 struct task_struct
*task
;
877 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
879 __module_get(THIS_MODULE
);
880 atomic_inc(&clp
->cl_count
);
881 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
882 rpc_peeraddr2str(clp
->cl_rpcclient
,
886 nfs4_clear_state_manager_bit(clp
);
888 module_put(THIS_MODULE
);
892 * Schedule a state recovery attempt
894 void nfs4_schedule_state_recovery(struct nfs_client
*clp
)
898 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
899 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
900 nfs4_schedule_state_manager(clp
);
903 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
906 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
907 /* Don't recover state that expired before the reboot */
908 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
909 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
912 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
913 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
917 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
919 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
920 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
921 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
922 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
926 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
928 struct inode
*inode
= state
->inode
;
929 struct nfs_inode
*nfsi
= NFS_I(inode
);
930 struct file_lock
*fl
;
933 if (inode
->i_flock
== NULL
)
936 /* Guard against delegation returns and new lock/unlock calls */
937 down_write(&nfsi
->rwsem
);
938 /* Protect inode->i_flock using the BKL */
940 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
941 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
943 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
946 status
= ops
->recover_lock(state
, fl
);
951 case -NFS4ERR_ADMIN_REVOKED
:
952 case -NFS4ERR_STALE_STATEID
:
953 case -NFS4ERR_BAD_STATEID
:
954 case -NFS4ERR_EXPIRED
:
955 case -NFS4ERR_NO_GRACE
:
956 case -NFS4ERR_STALE_CLIENTID
:
957 case -NFS4ERR_BADSESSION
:
958 case -NFS4ERR_BADSLOT
:
959 case -NFS4ERR_BAD_HIGH_SLOT
:
960 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
963 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
966 case -NFS4ERR_DENIED
:
967 case -NFS4ERR_RECLAIM_BAD
:
968 case -NFS4ERR_RECLAIM_CONFLICT
:
969 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
976 up_write(&nfsi
->rwsem
);
980 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
982 struct nfs4_state
*state
;
983 struct nfs4_lock_state
*lock
;
986 /* Note: we rely on the sp->so_states list being ordered
987 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
989 * This is needed to ensure that the server won't give us any
990 * read delegations that we have to return if, say, we are
991 * recovering after a network partition or a reboot from a
992 * server that doesn't support a grace period.
995 spin_lock(&sp
->so_lock
);
996 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
997 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
999 if (state
->state
== 0)
1001 atomic_inc(&state
->count
);
1002 spin_unlock(&sp
->so_lock
);
1003 status
= ops
->recover_open(sp
, state
);
1005 status
= nfs4_reclaim_locks(state
, ops
);
1007 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1008 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1009 printk("%s: Lock reclaim failed!\n",
1012 nfs4_put_open_state(state
);
1018 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1024 * Open state on this file cannot be recovered
1025 * All we can do is revert to using the zero stateid.
1027 memset(state
->stateid
.data
, 0,
1028 sizeof(state
->stateid
.data
));
1029 /* Mark the file as being 'closed' */
1032 case -NFS4ERR_ADMIN_REVOKED
:
1033 case -NFS4ERR_STALE_STATEID
:
1034 case -NFS4ERR_BAD_STATEID
:
1035 case -NFS4ERR_RECLAIM_BAD
:
1036 case -NFS4ERR_RECLAIM_CONFLICT
:
1037 nfs4_state_mark_reclaim_nograce(sp
->so_client
, state
);
1039 case -NFS4ERR_EXPIRED
:
1040 case -NFS4ERR_NO_GRACE
:
1041 nfs4_state_mark_reclaim_nograce(sp
->so_client
, state
);
1042 case -NFS4ERR_STALE_CLIENTID
:
1043 case -NFS4ERR_BADSESSION
:
1044 case -NFS4ERR_BADSLOT
:
1045 case -NFS4ERR_BAD_HIGH_SLOT
:
1046 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1049 nfs4_put_open_state(state
);
1052 spin_unlock(&sp
->so_lock
);
1055 nfs4_put_open_state(state
);
1059 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1061 struct nfs4_lock_state
*lock
;
1063 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1064 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1065 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1066 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1067 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1068 lock
->ls_seqid
.flags
= 0;
1069 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1073 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
, int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1075 struct nfs4_state_owner
*sp
;
1076 struct rb_node
*pos
;
1077 struct nfs4_state
*state
;
1079 /* Reset all sequence ids to zero */
1080 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1081 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1082 sp
->so_seqid
.flags
= 0;
1083 spin_lock(&sp
->so_lock
);
1084 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1085 if (mark_reclaim(clp
, state
))
1086 nfs4_clear_open_state(state
);
1088 spin_unlock(&sp
->so_lock
);
1092 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1094 /* Mark all delegations for reclaim */
1095 nfs_delegation_mark_reclaim(clp
);
1096 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1099 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1100 const struct nfs4_state_recovery_ops
*ops
)
1102 /* Notify the server we're done reclaiming our state */
1103 if (ops
->reclaim_complete
)
1104 (void)ops
->reclaim_complete(clp
);
1107 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1109 struct nfs4_state_owner
*sp
;
1110 struct rb_node
*pos
;
1111 struct nfs4_state
*state
;
1113 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1116 nfs4_reclaim_complete(clp
,
1117 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
]);
1119 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1120 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1121 spin_lock(&sp
->so_lock
);
1122 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1123 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
))
1125 nfs4_state_mark_reclaim_nograce(clp
, state
);
1127 spin_unlock(&sp
->so_lock
);
1130 nfs_delegation_reap_unclaimed(clp
);
1133 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1135 nfs_delegation_mark_reclaim(clp
);
1136 nfs_delegation_reap_unclaimed(clp
);
1139 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1141 nfs_delegation_clear_all(clp
);
1142 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1145 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1148 case -NFS4ERR_CB_PATH_DOWN
:
1149 nfs_handle_cb_pathdown(clp
);
1151 case -NFS4ERR_NO_GRACE
:
1152 nfs4_state_end_reclaim_reboot(clp
);
1154 case -NFS4ERR_STALE_CLIENTID
:
1155 case -NFS4ERR_LEASE_MOVED
:
1156 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1157 nfs4_state_end_reclaim_reboot(clp
);
1158 nfs4_state_start_reclaim_reboot(clp
);
1160 case -NFS4ERR_EXPIRED
:
1161 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1162 nfs4_state_start_reclaim_nograce(clp
);
1164 case -NFS4ERR_BADSESSION
:
1165 case -NFS4ERR_BADSLOT
:
1166 case -NFS4ERR_BAD_HIGH_SLOT
:
1167 case -NFS4ERR_DEADSESSION
:
1168 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1169 case -NFS4ERR_SEQ_FALSE_RETRY
:
1170 case -NFS4ERR_SEQ_MISORDERED
:
1171 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1172 /* Zero session reset errors */
1178 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1180 struct rb_node
*pos
;
1184 spin_lock(&clp
->cl_lock
);
1185 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1186 struct nfs4_state_owner
*sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1187 if (!test_and_clear_bit(ops
->owner_flag_bit
, &sp
->so_flags
))
1189 atomic_inc(&sp
->so_count
);
1190 spin_unlock(&clp
->cl_lock
);
1191 status
= nfs4_reclaim_open_state(sp
, ops
);
1193 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1194 nfs4_put_state_owner(sp
);
1195 return nfs4_recovery_handle_error(clp
, status
);
1197 nfs4_put_state_owner(sp
);
1200 spin_unlock(&clp
->cl_lock
);
1204 static int nfs4_check_lease(struct nfs_client
*clp
)
1206 struct rpc_cred
*cred
;
1207 struct nfs4_state_maintenance_ops
*ops
=
1208 nfs4_state_renewal_ops
[clp
->cl_minorversion
];
1209 int status
= -NFS4ERR_EXPIRED
;
1211 /* Is the client already known to have an expired lease? */
1212 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1214 spin_lock(&clp
->cl_lock
);
1215 cred
= ops
->get_state_renewal_cred_locked(clp
);
1216 spin_unlock(&clp
->cl_lock
);
1218 cred
= nfs4_get_setclientid_cred(clp
);
1222 status
= ops
->renew_lease(clp
, cred
);
1225 return nfs4_recovery_handle_error(clp
, status
);
1228 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1230 struct rpc_cred
*cred
;
1231 struct nfs4_state_recovery_ops
*ops
=
1232 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
];
1233 int status
= -ENOENT
;
1235 cred
= ops
->get_clid_cred(clp
);
1237 status
= ops
->establish_clid(clp
, cred
);
1239 /* Handle case where the user hasn't set up machine creds */
1240 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1241 nfs4_clear_machine_cred(clp
);
1244 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1245 status
= -EPROTONOSUPPORT
;
1250 #ifdef CONFIG_NFS_V4_1
1251 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1255 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
) {
1256 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1257 nfs4_state_start_reclaim_reboot(clp
);
1258 nfs4_schedule_state_recovery(clp
);
1259 } else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1260 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1261 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1262 SEQ4_STATUS_RECALLABLE_STATE_REVOKED
|
1263 SEQ4_STATUS_LEASE_MOVED
)) {
1264 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1265 nfs4_state_start_reclaim_nograce(clp
);
1266 nfs4_schedule_state_recovery(clp
);
1267 } else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1268 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1269 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1270 nfs_expire_all_delegations(clp
);
1273 static int nfs4_reset_session(struct nfs_client
*clp
)
1277 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1278 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1279 status
!= -NFS4ERR_DEADSESSION
) {
1280 status
= nfs4_recovery_handle_error(clp
, status
);
1284 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1285 status
= nfs4_proc_create_session(clp
);
1287 status
= nfs4_recovery_handle_error(clp
, status
);
1291 * Let the state manager reestablish state
1293 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) &&
1295 nfs41_setup_state_renewal(clp
);
1300 #else /* CONFIG_NFS_V4_1 */
1301 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1302 static int nfs4_begin_drain_session(struct nfs_client
*clp
) { return 0; }
1303 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1304 #endif /* CONFIG_NFS_V4_1 */
1306 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1307 * on EXCHANGE_ID for v4.1
1309 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1311 if (nfs4_has_session(clp
)) {
1313 case -NFS4ERR_DELAY
:
1314 case -NFS4ERR_CLID_INUSE
:
1318 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1319 * in nfs4_exchange_id */
1324 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1327 static void nfs4_state_manager(struct nfs_client
*clp
)
1331 /* Ensure exclusive access to NFSv4 state */
1333 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1334 /* We're going to have to re-establish a clientid */
1335 nfs4_begin_drain_session(clp
);
1336 status
= nfs4_reclaim_lease(clp
);
1338 nfs4_set_lease_expired(clp
, status
);
1339 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1342 if (clp
->cl_cons_state
==
1343 NFS_CS_SESSION_INITING
)
1344 nfs_mark_client_ready(clp
, status
);
1347 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1348 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1351 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1352 status
= nfs4_check_lease(clp
);
1353 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1355 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1359 /* Initialize or reset the session */
1360 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1361 && nfs4_has_session(clp
)) {
1362 nfs4_begin_drain_session(clp
);
1363 status
= nfs4_reset_session(clp
);
1364 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1370 /* First recover reboot state... */
1371 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1372 status
= nfs4_do_reclaim(clp
,
1373 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
]);
1374 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1375 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1377 nfs4_state_end_reclaim_reboot(clp
);
1378 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1384 /* Now recover expired state... */
1385 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1386 status
= nfs4_do_reclaim(clp
,
1387 nfs4_nograce_recovery_ops
[clp
->cl_minorversion
]);
1388 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1389 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1390 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1396 nfs4_end_drain_session(clp
);
1397 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1398 nfs_client_return_marked_delegations(clp
);
1402 nfs4_clear_state_manager_bit(clp
);
1403 /* Did we race with an attempt to give us more work? */
1404 if (clp
->cl_state
== 0)
1406 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1411 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1412 " with error %d\n", clp
->cl_hostname
, -status
);
1413 nfs4_end_drain_session(clp
);
1414 nfs4_clear_state_manager_bit(clp
);
1417 static int nfs4_run_state_manager(void *ptr
)
1419 struct nfs_client
*clp
= ptr
;
1421 allow_signal(SIGKILL
);
1422 nfs4_state_manager(clp
);
1423 nfs_put_client(clp
);
1424 module_put_and_exit(0);