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 nfs41_end_drain_session(struct nfs_client
*clp
,
139 struct nfs4_session
*ses
)
141 if (test_and_clear_bit(NFS4CLNT_SESSION_DRAINING
, &clp
->cl_state
))
142 rpc_wake_up(&ses
->fc_slot_table
.slot_tbl_waitq
);
145 static int nfs41_begin_drain_session(struct nfs_client
*clp
,
146 struct nfs4_session
*ses
)
148 struct nfs4_slot_table
*tbl
= &ses
->fc_slot_table
;
150 spin_lock(&tbl
->slot_tbl_lock
);
151 set_bit(NFS4CLNT_SESSION_DRAINING
, &clp
->cl_state
);
152 if (tbl
->highest_used_slotid
!= -1) {
153 INIT_COMPLETION(ses
->complete
);
154 spin_unlock(&tbl
->slot_tbl_lock
);
155 return wait_for_completion_interruptible(&ses
->complete
);
157 spin_unlock(&tbl
->slot_tbl_lock
);
161 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
165 status
= nfs41_begin_drain_session(clp
, clp
->cl_session
);
168 status
= nfs4_proc_exchange_id(clp
, cred
);
171 status
= nfs4_proc_create_session(clp
);
174 nfs41_end_drain_session(clp
, clp
->cl_session
);
175 nfs41_setup_state_renewal(clp
);
176 nfs_mark_client_ready(clp
, NFS_CS_READY
);
181 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
183 struct rpc_cred
*cred
;
185 spin_lock(&clp
->cl_lock
);
186 cred
= nfs4_get_machine_cred_locked(clp
);
187 spin_unlock(&clp
->cl_lock
);
191 #endif /* CONFIG_NFS_V4_1 */
193 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
195 struct nfs4_state_owner
*sp
;
197 struct rpc_cred
*cred
;
199 spin_lock(&clp
->cl_lock
);
200 cred
= nfs4_get_machine_cred_locked(clp
);
203 pos
= rb_first(&clp
->cl_state_owners
);
205 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
206 cred
= get_rpccred(sp
->so_cred
);
209 spin_unlock(&clp
->cl_lock
);
213 static void nfs_alloc_unique_id(struct rb_root
*root
, struct nfs_unique_id
*new,
214 __u64 minval
, int maxbits
)
216 struct rb_node
**p
, *parent
;
217 struct nfs_unique_id
*pos
;
221 mask
= (1ULL << maxbits
) - 1ULL;
223 /* Ensure distribution is more or less flat */
224 get_random_bytes(&new->id
, sizeof(new->id
));
226 if (new->id
< minval
)
234 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
236 if (new->id
< pos
->id
)
238 else if (new->id
> pos
->id
)
243 rb_link_node(&new->rb_node
, parent
, p
);
244 rb_insert_color(&new->rb_node
, root
);
249 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
253 parent
= rb_next(parent
);
256 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
257 if (new->id
< pos
->id
)
263 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
265 rb_erase(&id
->rb_node
, root
);
268 static struct nfs4_state_owner
*
269 nfs4_find_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
271 struct nfs_client
*clp
= server
->nfs_client
;
272 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
274 struct nfs4_state_owner
*sp
, *res
= NULL
;
278 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
280 if (server
< sp
->so_server
) {
281 p
= &parent
->rb_left
;
284 if (server
> sp
->so_server
) {
285 p
= &parent
->rb_right
;
288 if (cred
< sp
->so_cred
)
289 p
= &parent
->rb_left
;
290 else if (cred
> sp
->so_cred
)
291 p
= &parent
->rb_right
;
293 atomic_inc(&sp
->so_count
);
301 static struct nfs4_state_owner
*
302 nfs4_insert_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*new)
304 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
306 struct nfs4_state_owner
*sp
;
310 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
312 if (new->so_server
< sp
->so_server
) {
313 p
= &parent
->rb_left
;
316 if (new->so_server
> sp
->so_server
) {
317 p
= &parent
->rb_right
;
320 if (new->so_cred
< sp
->so_cred
)
321 p
= &parent
->rb_left
;
322 else if (new->so_cred
> sp
->so_cred
)
323 p
= &parent
->rb_right
;
325 atomic_inc(&sp
->so_count
);
329 nfs_alloc_unique_id(&clp
->cl_openowner_id
, &new->so_owner_id
, 1, 64);
330 rb_link_node(&new->so_client_node
, parent
, p
);
331 rb_insert_color(&new->so_client_node
, &clp
->cl_state_owners
);
336 nfs4_remove_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*sp
)
338 if (!RB_EMPTY_NODE(&sp
->so_client_node
))
339 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
340 nfs_free_unique_id(&clp
->cl_openowner_id
, &sp
->so_owner_id
);
344 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
345 * create a new state_owner.
348 static struct nfs4_state_owner
*
349 nfs4_alloc_state_owner(void)
351 struct nfs4_state_owner
*sp
;
353 sp
= kzalloc(sizeof(*sp
),GFP_KERNEL
);
356 spin_lock_init(&sp
->so_lock
);
357 INIT_LIST_HEAD(&sp
->so_states
);
358 INIT_LIST_HEAD(&sp
->so_delegations
);
359 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
360 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
361 spin_lock_init(&sp
->so_sequence
.lock
);
362 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
363 atomic_set(&sp
->so_count
, 1);
368 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
370 if (!RB_EMPTY_NODE(&sp
->so_client_node
)) {
371 struct nfs_client
*clp
= sp
->so_client
;
373 spin_lock(&clp
->cl_lock
);
374 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
375 RB_CLEAR_NODE(&sp
->so_client_node
);
376 spin_unlock(&clp
->cl_lock
);
380 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
382 struct nfs_client
*clp
= server
->nfs_client
;
383 struct nfs4_state_owner
*sp
, *new;
385 spin_lock(&clp
->cl_lock
);
386 sp
= nfs4_find_state_owner(server
, cred
);
387 spin_unlock(&clp
->cl_lock
);
390 new = nfs4_alloc_state_owner();
393 new->so_client
= clp
;
394 new->so_server
= server
;
396 spin_lock(&clp
->cl_lock
);
397 sp
= nfs4_insert_state_owner(clp
, new);
398 spin_unlock(&clp
->cl_lock
);
402 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
408 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
410 struct nfs_client
*clp
= sp
->so_client
;
411 struct rpc_cred
*cred
= sp
->so_cred
;
413 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
415 nfs4_remove_state_owner(clp
, sp
);
416 spin_unlock(&clp
->cl_lock
);
417 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
422 static struct nfs4_state
*
423 nfs4_alloc_open_state(void)
425 struct nfs4_state
*state
;
427 state
= kzalloc(sizeof(*state
), GFP_KERNEL
);
430 atomic_set(&state
->count
, 1);
431 INIT_LIST_HEAD(&state
->lock_states
);
432 spin_lock_init(&state
->state_lock
);
433 seqlock_init(&state
->seqlock
);
438 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
440 if (state
->state
== fmode
)
442 /* NB! List reordering - see the reclaim code for why. */
443 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
444 if (fmode
& FMODE_WRITE
)
445 list_move(&state
->open_states
, &state
->owner
->so_states
);
447 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
449 state
->state
= fmode
;
452 static struct nfs4_state
*
453 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
455 struct nfs_inode
*nfsi
= NFS_I(inode
);
456 struct nfs4_state
*state
;
458 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
459 if (state
->owner
!= owner
)
461 if (atomic_inc_not_zero(&state
->count
))
468 nfs4_free_open_state(struct nfs4_state
*state
)
474 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
476 struct nfs4_state
*state
, *new;
477 struct nfs_inode
*nfsi
= NFS_I(inode
);
479 spin_lock(&inode
->i_lock
);
480 state
= __nfs4_find_state_byowner(inode
, owner
);
481 spin_unlock(&inode
->i_lock
);
484 new = nfs4_alloc_open_state();
485 spin_lock(&owner
->so_lock
);
486 spin_lock(&inode
->i_lock
);
487 state
= __nfs4_find_state_byowner(inode
, owner
);
488 if (state
== NULL
&& new != NULL
) {
490 state
->owner
= owner
;
491 atomic_inc(&owner
->so_count
);
492 list_add(&state
->inode_states
, &nfsi
->open_states
);
493 state
->inode
= igrab(inode
);
494 spin_unlock(&inode
->i_lock
);
495 /* Note: The reclaim code dictates that we add stateless
496 * and read-only stateids to the end of the list */
497 list_add_tail(&state
->open_states
, &owner
->so_states
);
498 spin_unlock(&owner
->so_lock
);
500 spin_unlock(&inode
->i_lock
);
501 spin_unlock(&owner
->so_lock
);
503 nfs4_free_open_state(new);
509 void nfs4_put_open_state(struct nfs4_state
*state
)
511 struct inode
*inode
= state
->inode
;
512 struct nfs4_state_owner
*owner
= state
->owner
;
514 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
516 spin_lock(&inode
->i_lock
);
517 list_del(&state
->inode_states
);
518 list_del(&state
->open_states
);
519 spin_unlock(&inode
->i_lock
);
520 spin_unlock(&owner
->so_lock
);
522 nfs4_free_open_state(state
);
523 nfs4_put_state_owner(owner
);
527 * Close the current file.
529 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
, int wait
)
531 struct nfs4_state_owner
*owner
= state
->owner
;
535 atomic_inc(&owner
->so_count
);
536 /* Protect against nfs4_find_state() */
537 spin_lock(&owner
->so_lock
);
538 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
545 case FMODE_READ
|FMODE_WRITE
:
548 newstate
= FMODE_READ
|FMODE_WRITE
;
549 if (state
->n_rdwr
== 0) {
550 if (state
->n_rdonly
== 0) {
551 newstate
&= ~FMODE_READ
;
552 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
553 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
555 if (state
->n_wronly
== 0) {
556 newstate
&= ~FMODE_WRITE
;
557 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
558 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
561 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
563 nfs4_state_set_mode_locked(state
, newstate
);
564 spin_unlock(&owner
->so_lock
);
567 nfs4_put_open_state(state
);
568 nfs4_put_state_owner(owner
);
570 nfs4_do_close(path
, state
, wait
);
573 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
575 __nfs4_close(path
, state
, fmode
, 0);
578 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
580 __nfs4_close(path
, state
, fmode
, 1);
584 * Search the state->lock_states for an existing lock_owner
585 * that is compatible with current->files
587 static struct nfs4_lock_state
*
588 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
590 struct nfs4_lock_state
*pos
;
591 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
592 if (pos
->ls_owner
!= fl_owner
)
594 atomic_inc(&pos
->ls_count
);
601 * Return a compatible lock_state. If no initialized lock_state structure
602 * exists, return an uninitialized one.
605 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
607 struct nfs4_lock_state
*lsp
;
608 struct nfs_client
*clp
= state
->owner
->so_client
;
610 lsp
= kzalloc(sizeof(*lsp
), GFP_KERNEL
);
613 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
614 spin_lock_init(&lsp
->ls_sequence
.lock
);
615 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
616 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
617 atomic_set(&lsp
->ls_count
, 1);
618 lsp
->ls_state
= state
;
619 lsp
->ls_owner
= fl_owner
;
620 spin_lock(&clp
->cl_lock
);
621 nfs_alloc_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
, 1, 64);
622 spin_unlock(&clp
->cl_lock
);
623 INIT_LIST_HEAD(&lsp
->ls_locks
);
627 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
629 struct nfs_client
*clp
= lsp
->ls_state
->owner
->so_client
;
631 spin_lock(&clp
->cl_lock
);
632 nfs_free_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
);
633 spin_unlock(&clp
->cl_lock
);
634 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
639 * Return a compatible lock_state. If no initialized lock_state structure
640 * exists, return an uninitialized one.
643 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
645 struct nfs4_lock_state
*lsp
, *new = NULL
;
648 spin_lock(&state
->state_lock
);
649 lsp
= __nfs4_find_lock_state(state
, owner
);
653 list_add(&new->ls_locks
, &state
->lock_states
);
654 set_bit(LK_STATE_IN_USE
, &state
->flags
);
659 spin_unlock(&state
->state_lock
);
660 new = nfs4_alloc_lock_state(state
, owner
);
664 spin_unlock(&state
->state_lock
);
666 nfs4_free_lock_state(new);
671 * Release reference to lock_state, and free it if we see that
672 * it is no longer in use
674 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
676 struct nfs4_state
*state
;
680 state
= lsp
->ls_state
;
681 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
683 list_del(&lsp
->ls_locks
);
684 if (list_empty(&state
->lock_states
))
685 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
686 spin_unlock(&state
->state_lock
);
687 nfs4_free_lock_state(lsp
);
690 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
692 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
694 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
695 atomic_inc(&lsp
->ls_count
);
698 static void nfs4_fl_release_lock(struct file_lock
*fl
)
700 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
703 static const struct file_lock_operations nfs4_fl_lock_ops
= {
704 .fl_copy_lock
= nfs4_fl_copy_lock
,
705 .fl_release_private
= nfs4_fl_release_lock
,
708 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
710 struct nfs4_lock_state
*lsp
;
712 if (fl
->fl_ops
!= NULL
)
714 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
717 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
718 fl
->fl_ops
= &nfs4_fl_lock_ops
;
723 * Byte-range lock aware utility to initialize the stateid of read/write
726 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
)
728 struct nfs4_lock_state
*lsp
;
732 seq
= read_seqbegin(&state
->seqlock
);
733 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
734 } while (read_seqretry(&state
->seqlock
, seq
));
735 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
738 spin_lock(&state
->state_lock
);
739 lsp
= __nfs4_find_lock_state(state
, fl_owner
);
740 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
741 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
742 spin_unlock(&state
->state_lock
);
743 nfs4_put_lock_state(lsp
);
746 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
)
748 struct nfs_seqid
*new;
750 new = kmalloc(sizeof(*new), GFP_KERNEL
);
752 new->sequence
= counter
;
753 INIT_LIST_HEAD(&new->list
);
758 void nfs_free_seqid(struct nfs_seqid
*seqid
)
760 if (!list_empty(&seqid
->list
)) {
761 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
763 spin_lock(&sequence
->lock
);
764 list_del(&seqid
->list
);
765 spin_unlock(&sequence
->lock
);
766 rpc_wake_up(&sequence
->wait
);
772 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
773 * failed with a seqid incrementing error -
774 * see comments nfs_fs.h:seqid_mutating_error()
776 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
778 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
782 case -NFS4ERR_BAD_SEQID
:
783 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
785 printk(KERN_WARNING
"NFS: v4 server returned a bad"
786 " sequence-id error on an"
787 " unconfirmed sequence %p!\n",
789 case -NFS4ERR_STALE_CLIENTID
:
790 case -NFS4ERR_STALE_STATEID
:
791 case -NFS4ERR_BAD_STATEID
:
792 case -NFS4ERR_BADXDR
:
793 case -NFS4ERR_RESOURCE
:
794 case -NFS4ERR_NOFILEHANDLE
:
795 /* Non-seqid mutating errors */
799 * Note: no locking needed as we are guaranteed to be first
800 * on the sequence list
802 seqid
->sequence
->counter
++;
805 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
807 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
808 struct nfs4_state_owner
, so_seqid
);
809 struct nfs_server
*server
= sp
->so_server
;
811 if (status
== -NFS4ERR_BAD_SEQID
)
812 nfs4_drop_state_owner(sp
);
813 if (!nfs4_has_session(server
->nfs_client
))
814 nfs_increment_seqid(status
, seqid
);
818 * Increment the seqid if the LOCK/LOCKU succeeded, or
819 * failed with a seqid incrementing error -
820 * see comments nfs_fs.h:seqid_mutating_error()
822 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
824 nfs_increment_seqid(status
, seqid
);
827 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
829 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
832 spin_lock(&sequence
->lock
);
833 if (list_empty(&seqid
->list
))
834 list_add_tail(&seqid
->list
, &sequence
->list
);
835 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
837 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
840 spin_unlock(&sequence
->lock
);
844 static int nfs4_run_state_manager(void *);
846 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
848 smp_mb__before_clear_bit();
849 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
850 smp_mb__after_clear_bit();
851 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
852 rpc_wake_up(&clp
->cl_rpcwaitq
);
856 * Schedule the nfs_client asynchronous state management routine
858 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
860 struct task_struct
*task
;
862 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
864 __module_get(THIS_MODULE
);
865 atomic_inc(&clp
->cl_count
);
866 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
867 rpc_peeraddr2str(clp
->cl_rpcclient
,
871 nfs4_clear_state_manager_bit(clp
);
873 module_put(THIS_MODULE
);
877 * Schedule a state recovery attempt
879 void nfs4_schedule_state_recovery(struct nfs_client
*clp
)
883 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
884 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
885 nfs4_schedule_state_manager(clp
);
888 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
891 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
892 /* Don't recover state that expired before the reboot */
893 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
894 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
897 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
898 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
902 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
904 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
905 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
906 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
907 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
911 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
913 struct inode
*inode
= state
->inode
;
914 struct nfs_inode
*nfsi
= NFS_I(inode
);
915 struct file_lock
*fl
;
918 if (inode
->i_flock
== NULL
)
921 /* Guard against delegation returns and new lock/unlock calls */
922 down_write(&nfsi
->rwsem
);
923 /* Protect inode->i_flock using the BKL */
925 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
926 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
928 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
931 status
= ops
->recover_lock(state
, fl
);
936 case -NFS4ERR_ADMIN_REVOKED
:
937 case -NFS4ERR_STALE_STATEID
:
938 case -NFS4ERR_BAD_STATEID
:
939 case -NFS4ERR_EXPIRED
:
940 case -NFS4ERR_NO_GRACE
:
941 case -NFS4ERR_STALE_CLIENTID
:
942 case -NFS4ERR_BADSESSION
:
943 case -NFS4ERR_BADSLOT
:
944 case -NFS4ERR_BAD_HIGH_SLOT
:
945 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
948 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
951 case -NFS4ERR_DENIED
:
952 case -NFS4ERR_RECLAIM_BAD
:
953 case -NFS4ERR_RECLAIM_CONFLICT
:
954 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
961 up_write(&nfsi
->rwsem
);
965 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
967 struct nfs4_state
*state
;
968 struct nfs4_lock_state
*lock
;
971 /* Note: we rely on the sp->so_states list being ordered
972 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
974 * This is needed to ensure that the server won't give us any
975 * read delegations that we have to return if, say, we are
976 * recovering after a network partition or a reboot from a
977 * server that doesn't support a grace period.
980 spin_lock(&sp
->so_lock
);
981 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
982 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
984 if (state
->state
== 0)
986 atomic_inc(&state
->count
);
987 spin_unlock(&sp
->so_lock
);
988 status
= ops
->recover_open(sp
, state
);
990 status
= nfs4_reclaim_locks(state
, ops
);
992 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
993 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
994 printk("%s: Lock reclaim failed!\n",
997 nfs4_put_open_state(state
);
1003 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1009 * Open state on this file cannot be recovered
1010 * All we can do is revert to using the zero stateid.
1012 memset(state
->stateid
.data
, 0,
1013 sizeof(state
->stateid
.data
));
1014 /* Mark the file as being 'closed' */
1017 case -NFS4ERR_ADMIN_REVOKED
:
1018 case -NFS4ERR_STALE_STATEID
:
1019 case -NFS4ERR_BAD_STATEID
:
1020 case -NFS4ERR_RECLAIM_BAD
:
1021 case -NFS4ERR_RECLAIM_CONFLICT
:
1022 nfs4_state_mark_reclaim_nograce(sp
->so_client
, state
);
1024 case -NFS4ERR_EXPIRED
:
1025 case -NFS4ERR_NO_GRACE
:
1026 nfs4_state_mark_reclaim_nograce(sp
->so_client
, state
);
1027 case -NFS4ERR_STALE_CLIENTID
:
1028 case -NFS4ERR_BADSESSION
:
1029 case -NFS4ERR_BADSLOT
:
1030 case -NFS4ERR_BAD_HIGH_SLOT
:
1031 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1034 nfs4_put_open_state(state
);
1037 spin_unlock(&sp
->so_lock
);
1040 nfs4_put_open_state(state
);
1044 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1046 struct nfs4_lock_state
*lock
;
1048 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1049 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1050 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1051 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1052 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1053 lock
->ls_seqid
.flags
= 0;
1054 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1058 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
, int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1060 struct nfs4_state_owner
*sp
;
1061 struct rb_node
*pos
;
1062 struct nfs4_state
*state
;
1064 /* Reset all sequence ids to zero */
1065 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1066 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1067 sp
->so_seqid
.flags
= 0;
1068 spin_lock(&sp
->so_lock
);
1069 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1070 if (mark_reclaim(clp
, state
))
1071 nfs4_clear_open_state(state
);
1073 spin_unlock(&sp
->so_lock
);
1077 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1079 /* Mark all delegations for reclaim */
1080 nfs_delegation_mark_reclaim(clp
);
1081 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1084 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1085 const struct nfs4_state_recovery_ops
*ops
)
1087 /* Notify the server we're done reclaiming our state */
1088 if (ops
->reclaim_complete
)
1089 (void)ops
->reclaim_complete(clp
);
1092 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1094 struct nfs4_state_owner
*sp
;
1095 struct rb_node
*pos
;
1096 struct nfs4_state
*state
;
1098 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1101 nfs4_reclaim_complete(clp
,
1102 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
]);
1104 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1105 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1106 spin_lock(&sp
->so_lock
);
1107 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1108 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
))
1110 nfs4_state_mark_reclaim_nograce(clp
, state
);
1112 spin_unlock(&sp
->so_lock
);
1115 nfs_delegation_reap_unclaimed(clp
);
1118 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1120 nfs_delegation_mark_reclaim(clp
);
1121 nfs_delegation_reap_unclaimed(clp
);
1124 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1126 nfs_delegation_clear_all(clp
);
1127 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1130 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1133 case -NFS4ERR_CB_PATH_DOWN
:
1134 nfs_handle_cb_pathdown(clp
);
1136 case -NFS4ERR_NO_GRACE
:
1137 nfs4_state_end_reclaim_reboot(clp
);
1139 case -NFS4ERR_STALE_CLIENTID
:
1140 case -NFS4ERR_LEASE_MOVED
:
1141 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1142 nfs4_state_end_reclaim_reboot(clp
);
1143 nfs4_state_start_reclaim_reboot(clp
);
1145 case -NFS4ERR_EXPIRED
:
1146 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1147 nfs4_state_start_reclaim_nograce(clp
);
1149 case -NFS4ERR_BADSESSION
:
1150 case -NFS4ERR_BADSLOT
:
1151 case -NFS4ERR_BAD_HIGH_SLOT
:
1152 case -NFS4ERR_DEADSESSION
:
1153 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1154 case -NFS4ERR_SEQ_FALSE_RETRY
:
1155 case -NFS4ERR_SEQ_MISORDERED
:
1156 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1157 /* Zero session reset errors */
1163 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1165 struct rb_node
*pos
;
1169 spin_lock(&clp
->cl_lock
);
1170 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1171 struct nfs4_state_owner
*sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1172 if (!test_and_clear_bit(ops
->owner_flag_bit
, &sp
->so_flags
))
1174 atomic_inc(&sp
->so_count
);
1175 spin_unlock(&clp
->cl_lock
);
1176 status
= nfs4_reclaim_open_state(sp
, ops
);
1178 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1179 nfs4_put_state_owner(sp
);
1180 return nfs4_recovery_handle_error(clp
, status
);
1182 nfs4_put_state_owner(sp
);
1185 spin_unlock(&clp
->cl_lock
);
1189 static int nfs4_check_lease(struct nfs_client
*clp
)
1191 struct rpc_cred
*cred
;
1192 struct nfs4_state_maintenance_ops
*ops
=
1193 nfs4_state_renewal_ops
[clp
->cl_minorversion
];
1194 int status
= -NFS4ERR_EXPIRED
;
1196 /* Is the client already known to have an expired lease? */
1197 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1199 spin_lock(&clp
->cl_lock
);
1200 cred
= ops
->get_state_renewal_cred_locked(clp
);
1201 spin_unlock(&clp
->cl_lock
);
1203 cred
= nfs4_get_setclientid_cred(clp
);
1207 status
= ops
->renew_lease(clp
, cred
);
1210 return nfs4_recovery_handle_error(clp
, status
);
1213 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1215 struct rpc_cred
*cred
;
1216 struct nfs4_state_recovery_ops
*ops
=
1217 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
];
1218 int status
= -ENOENT
;
1220 cred
= ops
->get_clid_cred(clp
);
1222 status
= ops
->establish_clid(clp
, cred
);
1224 /* Handle case where the user hasn't set up machine creds */
1225 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1226 nfs4_clear_machine_cred(clp
);
1229 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1230 status
= -EPROTONOSUPPORT
;
1235 #ifdef CONFIG_NFS_V4_1
1236 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1240 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
) {
1241 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1242 nfs4_state_start_reclaim_reboot(clp
);
1243 nfs4_schedule_state_recovery(clp
);
1244 } else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1245 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1246 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1247 SEQ4_STATUS_RECALLABLE_STATE_REVOKED
|
1248 SEQ4_STATUS_LEASE_MOVED
)) {
1249 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1250 nfs4_state_start_reclaim_nograce(clp
);
1251 nfs4_schedule_state_recovery(clp
);
1252 } else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1253 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1254 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1255 nfs_expire_all_delegations(clp
);
1258 static int nfs4_reset_session(struct nfs_client
*clp
)
1260 struct nfs4_session
*ses
= clp
->cl_session
;
1263 status
= nfs41_begin_drain_session(clp
, ses
);
1267 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1268 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1269 status
!= -NFS4ERR_DEADSESSION
) {
1270 status
= nfs4_recovery_handle_error(clp
, status
);
1274 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1275 status
= nfs4_proc_create_session(clp
);
1277 status
= nfs4_recovery_handle_error(clp
, status
);
1281 * Let the state manager reestablish state
1282 * without waking other tasks yet.
1284 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1285 /* Wake up the next rpc task */
1286 nfs41_end_drain_session(clp
, ses
);
1288 nfs41_setup_state_renewal(clp
);
1293 #else /* CONFIG_NFS_V4_1 */
1294 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1295 #endif /* CONFIG_NFS_V4_1 */
1297 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1298 * on EXCHANGE_ID for v4.1
1300 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1302 if (nfs4_has_session(clp
)) {
1304 case -NFS4ERR_DELAY
:
1305 case -NFS4ERR_CLID_INUSE
:
1309 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1310 * in nfs4_exchange_id */
1315 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1318 static void nfs4_state_manager(struct nfs_client
*clp
)
1322 /* Ensure exclusive access to NFSv4 state */
1324 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1325 /* We're going to have to re-establish a clientid */
1326 status
= nfs4_reclaim_lease(clp
);
1328 nfs4_set_lease_expired(clp
, status
);
1329 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1332 if (clp
->cl_cons_state
==
1333 NFS_CS_SESSION_INITING
)
1334 nfs_mark_client_ready(clp
, status
);
1337 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1338 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1341 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1342 status
= nfs4_check_lease(clp
);
1343 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1345 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1349 /* Initialize or reset the session */
1350 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1351 && nfs4_has_session(clp
)) {
1352 status
= nfs4_reset_session(clp
);
1353 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1359 /* First recover reboot state... */
1360 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1361 status
= nfs4_do_reclaim(clp
,
1362 nfs4_reboot_recovery_ops
[clp
->cl_minorversion
]);
1363 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1364 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1366 nfs4_state_end_reclaim_reboot(clp
);
1367 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1373 /* Now recover expired state... */
1374 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1375 status
= nfs4_do_reclaim(clp
,
1376 nfs4_nograce_recovery_ops
[clp
->cl_minorversion
]);
1377 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1378 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1379 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1385 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1386 nfs_client_return_marked_delegations(clp
);
1390 nfs4_clear_state_manager_bit(clp
);
1391 /* Did we race with an attempt to give us more work? */
1392 if (clp
->cl_state
== 0)
1394 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1399 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1400 " with error %d\n", clp
->cl_hostname
, -status
);
1401 nfs4_clear_state_manager_bit(clp
);
1404 static int nfs4_run_state_manager(void *ptr
)
1406 struct nfs_client
*clp
= ptr
;
1408 allow_signal(SIGKILL
);
1409 nfs4_state_manager(clp
);
1410 nfs_put_client(clp
);
1411 module_put_and_exit(0);