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/config.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/workqueue.h>
47 #include <linux/bitops.h>
51 #include "delegation.h"
53 #define OPENOWNER_POOL_SIZE 8
55 const nfs4_stateid zero_stateid
;
57 static DEFINE_SPINLOCK(state_spinlock
);
58 static LIST_HEAD(nfs4_clientid_list
);
60 static void nfs4_recover_state(void *);
63 init_nfsv4_state(struct nfs_server
*server
)
65 server
->nfs4_state
= NULL
;
66 INIT_LIST_HEAD(&server
->nfs4_siblings
);
70 destroy_nfsv4_state(struct nfs_server
*server
)
72 if (server
->mnt_path
) {
73 kfree(server
->mnt_path
);
74 server
->mnt_path
= NULL
;
76 if (server
->nfs4_state
) {
77 nfs4_put_client(server
->nfs4_state
);
78 server
->nfs4_state
= NULL
;
83 * nfs4_get_client(): returns an empty client structure
84 * nfs4_put_client(): drops reference to client structure
86 * Since these are allocated/deallocated very rarely, we don't
87 * bother putting them in a slab cache...
89 static struct nfs4_client
*
90 nfs4_alloc_client(struct in_addr
*addr
)
92 struct nfs4_client
*clp
;
94 if (nfs_callback_up() < 0)
96 if ((clp
= kmalloc(sizeof(*clp
), GFP_KERNEL
)) == NULL
) {
100 memset(clp
, 0, sizeof(*clp
));
101 memcpy(&clp
->cl_addr
, addr
, sizeof(clp
->cl_addr
));
102 init_rwsem(&clp
->cl_sem
);
103 INIT_LIST_HEAD(&clp
->cl_delegations
);
104 INIT_LIST_HEAD(&clp
->cl_state_owners
);
105 INIT_LIST_HEAD(&clp
->cl_unused
);
106 spin_lock_init(&clp
->cl_lock
);
107 atomic_set(&clp
->cl_count
, 1);
108 INIT_WORK(&clp
->cl_recoverd
, nfs4_recover_state
, clp
);
109 INIT_WORK(&clp
->cl_renewd
, nfs4_renew_state
, clp
);
110 INIT_LIST_HEAD(&clp
->cl_superblocks
);
111 init_waitqueue_head(&clp
->cl_waitq
);
112 rpc_init_wait_queue(&clp
->cl_rpcwaitq
, "NFS4 client");
113 clp
->cl_boot_time
= CURRENT_TIME
;
114 clp
->cl_state
= 1 << NFS4CLNT_OK
;
119 nfs4_free_client(struct nfs4_client
*clp
)
121 struct nfs4_state_owner
*sp
;
123 while (!list_empty(&clp
->cl_unused
)) {
124 sp
= list_entry(clp
->cl_unused
.next
,
125 struct nfs4_state_owner
,
127 list_del(&sp
->so_list
);
130 BUG_ON(!list_empty(&clp
->cl_state_owners
));
132 put_rpccred(clp
->cl_cred
);
133 nfs_idmap_delete(clp
);
134 if (clp
->cl_rpcclient
)
135 rpc_shutdown_client(clp
->cl_rpcclient
);
140 static struct nfs4_client
*__nfs4_find_client(struct in_addr
*addr
)
142 struct nfs4_client
*clp
;
143 list_for_each_entry(clp
, &nfs4_clientid_list
, cl_servers
) {
144 if (memcmp(&clp
->cl_addr
, addr
, sizeof(clp
->cl_addr
)) == 0) {
145 atomic_inc(&clp
->cl_count
);
152 struct nfs4_client
*nfs4_find_client(struct in_addr
*addr
)
154 struct nfs4_client
*clp
;
155 spin_lock(&state_spinlock
);
156 clp
= __nfs4_find_client(addr
);
157 spin_unlock(&state_spinlock
);
162 nfs4_get_client(struct in_addr
*addr
)
164 struct nfs4_client
*clp
, *new = NULL
;
166 spin_lock(&state_spinlock
);
168 clp
= __nfs4_find_client(addr
);
173 list_add(&clp
->cl_servers
, &nfs4_clientid_list
);
177 spin_unlock(&state_spinlock
);
178 new = nfs4_alloc_client(addr
);
179 spin_lock(&state_spinlock
);
183 spin_unlock(&state_spinlock
);
185 nfs4_free_client(new);
190 nfs4_put_client(struct nfs4_client
*clp
)
192 if (!atomic_dec_and_lock(&clp
->cl_count
, &state_spinlock
))
194 list_del(&clp
->cl_servers
);
195 spin_unlock(&state_spinlock
);
196 BUG_ON(!list_empty(&clp
->cl_superblocks
));
197 wake_up_all(&clp
->cl_waitq
);
198 rpc_wake_up(&clp
->cl_rpcwaitq
);
199 nfs4_kill_renewd(clp
);
200 nfs4_free_client(clp
);
203 static int __nfs4_init_client(struct nfs4_client
*clp
)
205 int status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, nfs_callback_tcpport
);
207 status
= nfs4_proc_setclientid_confirm(clp
);
209 nfs4_schedule_state_renewal(clp
);
213 int nfs4_init_client(struct nfs4_client
*clp
)
215 return nfs4_map_errors(__nfs4_init_client(clp
));
219 nfs4_alloc_lockowner_id(struct nfs4_client
*clp
)
221 return clp
->cl_lockowner_id
++;
224 static struct nfs4_state_owner
*
225 nfs4_client_grab_unused(struct nfs4_client
*clp
, struct rpc_cred
*cred
)
227 struct nfs4_state_owner
*sp
= NULL
;
229 if (!list_empty(&clp
->cl_unused
)) {
230 sp
= list_entry(clp
->cl_unused
.next
, struct nfs4_state_owner
, so_list
);
231 atomic_inc(&sp
->so_count
);
233 list_move(&sp
->so_list
, &clp
->cl_state_owners
);
239 static struct nfs4_state_owner
*
240 nfs4_find_state_owner(struct nfs4_client
*clp
, struct rpc_cred
*cred
)
242 struct nfs4_state_owner
*sp
, *res
= NULL
;
244 list_for_each_entry(sp
, &clp
->cl_state_owners
, so_list
) {
245 if (sp
->so_cred
!= cred
)
247 atomic_inc(&sp
->so_count
);
248 /* Move to the head of the list */
249 list_move(&sp
->so_list
, &clp
->cl_state_owners
);
257 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
258 * create a new state_owner.
261 static struct nfs4_state_owner
*
262 nfs4_alloc_state_owner(void)
264 struct nfs4_state_owner
*sp
;
266 sp
= kmalloc(sizeof(*sp
),GFP_KERNEL
);
269 init_MUTEX(&sp
->so_sema
);
270 sp
->so_seqid
= 0; /* arbitrary */
271 INIT_LIST_HEAD(&sp
->so_states
);
272 INIT_LIST_HEAD(&sp
->so_delegations
);
273 atomic_set(&sp
->so_count
, 1);
278 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
280 struct nfs4_client
*clp
= sp
->so_client
;
281 spin_lock(&clp
->cl_lock
);
282 list_del_init(&sp
->so_list
);
283 spin_unlock(&clp
->cl_lock
);
287 * Note: must be called with clp->cl_sem held in order to prevent races
288 * with reboot recovery!
290 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
292 struct nfs4_client
*clp
= server
->nfs4_state
;
293 struct nfs4_state_owner
*sp
, *new;
296 new = nfs4_alloc_state_owner();
297 spin_lock(&clp
->cl_lock
);
298 sp
= nfs4_find_state_owner(clp
, cred
);
300 sp
= nfs4_client_grab_unused(clp
, cred
);
301 if (sp
== NULL
&& new != NULL
) {
302 list_add(&new->so_list
, &clp
->cl_state_owners
);
303 new->so_client
= clp
;
304 new->so_id
= nfs4_alloc_lockowner_id(clp
);
309 spin_unlock(&clp
->cl_lock
);
319 * Must be called with clp->cl_sem held in order to avoid races
320 * with state recovery...
322 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
324 struct nfs4_client
*clp
= sp
->so_client
;
325 struct rpc_cred
*cred
= sp
->so_cred
;
327 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
329 if (clp
->cl_nunused
>= OPENOWNER_POOL_SIZE
)
331 if (list_empty(&sp
->so_list
))
333 list_move(&sp
->so_list
, &clp
->cl_unused
);
335 spin_unlock(&clp
->cl_lock
);
340 list_del(&sp
->so_list
);
341 spin_unlock(&clp
->cl_lock
);
346 static struct nfs4_state
*
347 nfs4_alloc_open_state(void)
349 struct nfs4_state
*state
;
351 state
= kmalloc(sizeof(*state
), GFP_KERNEL
);
358 memset(state
->stateid
.data
, 0, sizeof(state
->stateid
.data
));
359 atomic_set(&state
->count
, 1);
360 INIT_LIST_HEAD(&state
->lock_states
);
361 init_MUTEX(&state
->lock_sema
);
362 rwlock_init(&state
->state_lock
);
366 static struct nfs4_state
*
367 __nfs4_find_state(struct inode
*inode
, struct rpc_cred
*cred
, mode_t mode
)
369 struct nfs_inode
*nfsi
= NFS_I(inode
);
370 struct nfs4_state
*state
;
372 mode
&= (FMODE_READ
|FMODE_WRITE
);
373 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
374 if (state
->owner
->so_cred
!= cred
)
376 if ((mode
& FMODE_READ
) != 0 && state
->nreaders
== 0)
378 if ((mode
& FMODE_WRITE
) != 0 && state
->nwriters
== 0)
380 if ((state
->state
& mode
) != mode
)
382 atomic_inc(&state
->count
);
383 if (mode
& FMODE_READ
)
385 if (mode
& FMODE_WRITE
)
392 static struct nfs4_state
*
393 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
395 struct nfs_inode
*nfsi
= NFS_I(inode
);
396 struct nfs4_state
*state
;
398 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
399 /* Is this in the process of being freed? */
400 if (state
->nreaders
== 0 && state
->nwriters
== 0)
402 if (state
->owner
== owner
) {
403 atomic_inc(&state
->count
);
411 nfs4_find_state(struct inode
*inode
, struct rpc_cred
*cred
, mode_t mode
)
413 struct nfs4_state
*state
;
415 spin_lock(&inode
->i_lock
);
416 state
= __nfs4_find_state(inode
, cred
, mode
);
417 spin_unlock(&inode
->i_lock
);
422 nfs4_free_open_state(struct nfs4_state
*state
)
428 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
430 struct nfs4_state
*state
, *new;
431 struct nfs_inode
*nfsi
= NFS_I(inode
);
433 spin_lock(&inode
->i_lock
);
434 state
= __nfs4_find_state_byowner(inode
, owner
);
435 spin_unlock(&inode
->i_lock
);
438 new = nfs4_alloc_open_state();
439 spin_lock(&inode
->i_lock
);
440 state
= __nfs4_find_state_byowner(inode
, owner
);
441 if (state
== NULL
&& new != NULL
) {
443 /* Caller *must* be holding owner->so_sem */
444 /* Note: The reclaim code dictates that we add stateless
445 * and read-only stateids to the end of the list */
446 list_add_tail(&state
->open_states
, &owner
->so_states
);
447 state
->owner
= owner
;
448 atomic_inc(&owner
->so_count
);
449 list_add(&state
->inode_states
, &nfsi
->open_states
);
450 state
->inode
= igrab(inode
);
451 spin_unlock(&inode
->i_lock
);
453 spin_unlock(&inode
->i_lock
);
455 nfs4_free_open_state(new);
462 * Beware! Caller must be holding exactly one
463 * reference to clp->cl_sem and owner->so_sema!
465 void nfs4_put_open_state(struct nfs4_state
*state
)
467 struct inode
*inode
= state
->inode
;
468 struct nfs4_state_owner
*owner
= state
->owner
;
470 if (!atomic_dec_and_lock(&state
->count
, &inode
->i_lock
))
472 if (!list_empty(&state
->inode_states
))
473 list_del(&state
->inode_states
);
474 spin_unlock(&inode
->i_lock
);
475 list_del(&state
->open_states
);
477 BUG_ON (state
->state
!= 0);
478 nfs4_free_open_state(state
);
479 nfs4_put_state_owner(owner
);
483 * Beware! Caller must be holding no references to clp->cl_sem!
486 void nfs4_close_state(struct nfs4_state
*state
, mode_t mode
)
488 struct inode
*inode
= state
->inode
;
489 struct nfs4_state_owner
*owner
= state
->owner
;
490 struct nfs4_client
*clp
= owner
->so_client
;
493 atomic_inc(&owner
->so_count
);
494 down_read(&clp
->cl_sem
);
495 down(&owner
->so_sema
);
496 /* Protect against nfs4_find_state() */
497 spin_lock(&inode
->i_lock
);
498 if (mode
& FMODE_READ
)
500 if (mode
& FMODE_WRITE
)
502 if (state
->nwriters
== 0) {
503 if (state
->nreaders
== 0)
504 list_del_init(&state
->inode_states
);
505 /* See reclaim code */
506 list_move_tail(&state
->open_states
, &owner
->so_states
);
508 spin_unlock(&inode
->i_lock
);
510 if (state
->state
!= 0) {
512 newstate
|= FMODE_READ
;
514 newstate
|= FMODE_WRITE
;
515 if (state
->state
== newstate
)
517 if (nfs4_do_close(inode
, state
, newstate
) == -EINPROGRESS
)
521 nfs4_put_open_state(state
);
523 nfs4_put_state_owner(owner
);
524 up_read(&clp
->cl_sem
);
528 * Search the state->lock_states for an existing lock_owner
529 * that is compatible with current->files
531 static struct nfs4_lock_state
*
532 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
534 struct nfs4_lock_state
*pos
;
535 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
536 if (pos
->ls_owner
!= fl_owner
)
538 atomic_inc(&pos
->ls_count
);
544 struct nfs4_lock_state
*
545 nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
547 struct nfs4_lock_state
*lsp
;
548 read_lock(&state
->state_lock
);
549 lsp
= __nfs4_find_lock_state(state
, fl_owner
);
550 read_unlock(&state
->state_lock
);
555 * Return a compatible lock_state. If no initialized lock_state structure
556 * exists, return an uninitialized one.
558 * The caller must be holding state->lock_sema
560 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
562 struct nfs4_lock_state
*lsp
;
563 struct nfs4_client
*clp
= state
->owner
->so_client
;
565 lsp
= kmalloc(sizeof(*lsp
), GFP_KERNEL
);
569 lsp
->ls_seqid
= 0; /* arbitrary */
571 memset(lsp
->ls_stateid
.data
, 0, sizeof(lsp
->ls_stateid
.data
));
572 atomic_set(&lsp
->ls_count
, 1);
573 lsp
->ls_owner
= fl_owner
;
574 INIT_LIST_HEAD(&lsp
->ls_locks
);
575 spin_lock(&clp
->cl_lock
);
576 lsp
->ls_id
= nfs4_alloc_lockowner_id(clp
);
577 spin_unlock(&clp
->cl_lock
);
582 * Return a compatible lock_state. If no initialized lock_state structure
583 * exists, return an uninitialized one.
585 * The caller must be holding state->lock_sema and clp->cl_sem
587 struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
589 struct nfs4_lock_state
* lsp
;
591 lsp
= nfs4_find_lock_state(state
, owner
);
593 lsp
= nfs4_alloc_lock_state(state
, owner
);
598 * Byte-range lock aware utility to initialize the stateid of read/write
602 nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
)
604 if (test_bit(LK_STATE_IN_USE
, &state
->flags
)) {
605 struct nfs4_lock_state
*lsp
;
607 lsp
= nfs4_find_lock_state(state
, fl_owner
);
609 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
610 nfs4_put_lock_state(lsp
);
614 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
618 * Called with state->lock_sema and clp->cl_sem held.
620 void nfs4_increment_lock_seqid(int status
, struct nfs4_lock_state
*lsp
)
622 if (status
== NFS_OK
|| seqid_mutating_err(-status
))
627 * Check to see if the request lock (type FL_UNLK) effects the fl lock.
629 * fl and request must have the same posix owner
632 * 0 -> fl not effected by request
633 * 1 -> fl consumed by request
637 nfs4_check_unlock(struct file_lock
*fl
, struct file_lock
*request
)
639 if (fl
->fl_start
>= request
->fl_start
&& fl
->fl_end
<= request
->fl_end
)
645 * Post an initialized lock_state on the state->lock_states list.
647 void nfs4_notify_setlk(struct nfs4_state
*state
, struct file_lock
*request
, struct nfs4_lock_state
*lsp
)
649 if (!list_empty(&lsp
->ls_locks
))
651 atomic_inc(&lsp
->ls_count
);
652 write_lock(&state
->state_lock
);
653 list_add(&lsp
->ls_locks
, &state
->lock_states
);
654 set_bit(LK_STATE_IN_USE
, &state
->flags
);
655 write_unlock(&state
->state_lock
);
659 * to decide to 'reap' lock state:
660 * 1) search i_flock for file_locks with fl.lock_state = to ls.
661 * 2) determine if unlock will consume found lock.
668 nfs4_notify_unlck(struct nfs4_state
*state
, struct file_lock
*request
, struct nfs4_lock_state
*lsp
)
670 struct inode
*inode
= state
->inode
;
671 struct file_lock
*fl
;
673 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
674 if (!(fl
->fl_flags
& FL_POSIX
))
676 if (fl
->fl_owner
!= lsp
->ls_owner
)
678 /* Exit if we find at least one lock which is not consumed */
679 if (nfs4_check_unlock(fl
,request
) == 0)
683 write_lock(&state
->state_lock
);
684 list_del_init(&lsp
->ls_locks
);
685 if (list_empty(&state
->lock_states
))
686 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
687 write_unlock(&state
->state_lock
);
688 nfs4_put_lock_state(lsp
);
692 * Release reference to lock_state, and free it if we see that
693 * it is no longer in use
696 nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
698 if (!atomic_dec_and_test(&lsp
->ls_count
))
700 BUG_ON (!list_empty(&lsp
->ls_locks
));
705 * Called with sp->so_sema and clp->cl_sem held.
707 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
708 * failed with a seqid incrementing error -
709 * see comments nfs_fs.h:seqid_mutating_error()
711 void nfs4_increment_seqid(int status
, struct nfs4_state_owner
*sp
)
713 if (status
== NFS_OK
|| seqid_mutating_err(-status
))
715 /* If the server returns BAD_SEQID, unhash state_owner here */
716 if (status
== -NFS4ERR_BAD_SEQID
)
717 nfs4_drop_state_owner(sp
);
720 static int reclaimer(void *);
721 struct reclaimer_args
{
722 struct nfs4_client
*clp
;
723 struct completion complete
;
727 * State recovery routine
730 nfs4_recover_state(void *data
)
732 struct nfs4_client
*clp
= (struct nfs4_client
*)data
;
733 struct reclaimer_args args
= {
738 init_completion(&args
.complete
);
740 if (kernel_thread(reclaimer
, &args
, CLONE_KERNEL
) < 0)
741 goto out_failed_clear
;
742 wait_for_completion(&args
.complete
);
745 set_bit(NFS4CLNT_OK
, &clp
->cl_state
);
746 wake_up_all(&clp
->cl_waitq
);
747 rpc_wake_up(&clp
->cl_rpcwaitq
);
751 * Schedule a state recovery attempt
754 nfs4_schedule_state_recovery(struct nfs4_client
*clp
)
758 if (test_and_clear_bit(NFS4CLNT_OK
, &clp
->cl_state
))
759 schedule_work(&clp
->cl_recoverd
);
762 static int nfs4_reclaim_locks(struct nfs4_state_recovery_ops
*ops
, struct nfs4_state
*state
)
764 struct inode
*inode
= state
->inode
;
765 struct file_lock
*fl
;
768 for (fl
= inode
->i_flock
; fl
!= 0; fl
= fl
->fl_next
) {
769 if (!(fl
->fl_flags
& FL_POSIX
))
771 if (((struct nfs_open_context
*)fl
->fl_file
->private_data
)->state
!= state
)
773 status
= ops
->recover_lock(state
, fl
);
778 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
779 __FUNCTION__
, status
);
780 case -NFS4ERR_EXPIRED
:
781 case -NFS4ERR_NO_GRACE
:
782 case -NFS4ERR_RECLAIM_BAD
:
783 case -NFS4ERR_RECLAIM_CONFLICT
:
784 /* kill_proc(fl->fl_owner, SIGLOST, 1); */
786 case -NFS4ERR_STALE_CLIENTID
:
795 static int nfs4_reclaim_open_state(struct nfs4_state_recovery_ops
*ops
, struct nfs4_state_owner
*sp
)
797 struct nfs4_state
*state
;
798 struct nfs4_lock_state
*lock
;
801 /* Note: we rely on the sp->so_states list being ordered
802 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
804 * This is needed to ensure that the server won't give us any
805 * read delegations that we have to return if, say, we are
806 * recovering after a network partition or a reboot from a
807 * server that doesn't support a grace period.
809 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
810 if (state
->state
== 0)
812 status
= ops
->recover_open(sp
, state
);
813 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
)
814 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
816 status
= nfs4_reclaim_locks(ops
, state
);
819 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
820 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
821 printk("%s: Lock reclaim failed!\n",
828 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
829 __FUNCTION__
, status
);
831 case -NFS4ERR_RECLAIM_BAD
:
832 case -NFS4ERR_RECLAIM_CONFLICT
:
834 * Open state on this file cannot be recovered
835 * All we can do is revert to using the zero stateid.
837 memset(state
->stateid
.data
, 0,
838 sizeof(state
->stateid
.data
));
839 /* Mark the file as being 'closed' */
842 case -NFS4ERR_EXPIRED
:
843 case -NFS4ERR_NO_GRACE
:
844 case -NFS4ERR_STALE_CLIENTID
:
853 static int reclaimer(void *ptr
)
855 struct reclaimer_args
*args
= (struct reclaimer_args
*)ptr
;
856 struct nfs4_client
*clp
= args
->clp
;
857 struct nfs4_state_owner
*sp
;
858 struct nfs4_state_recovery_ops
*ops
;
861 daemonize("%u.%u.%u.%u-reclaim", NIPQUAD(clp
->cl_addr
));
862 allow_signal(SIGKILL
);
864 atomic_inc(&clp
->cl_count
);
865 complete(&args
->complete
);
867 /* Ensure exclusive access to NFSv4 state */
869 down_write(&clp
->cl_sem
);
870 /* Are there any NFS mounts out there? */
871 if (list_empty(&clp
->cl_superblocks
))
874 status
= nfs4_proc_renew(clp
);
877 case -NFS4ERR_CB_PATH_DOWN
:
879 case -NFS4ERR_STALE_CLIENTID
:
880 case -NFS4ERR_LEASE_MOVED
:
881 ops
= &nfs4_reboot_recovery_ops
;
884 ops
= &nfs4_network_partition_recovery_ops
;
886 status
= __nfs4_init_client(clp
);
889 /* Mark all delegations for reclaim */
890 nfs_delegation_mark_reclaim(clp
);
891 /* Note: list is protected by exclusive lock on cl->cl_sem */
892 list_for_each_entry(sp
, &clp
->cl_state_owners
, so_list
) {
893 status
= nfs4_reclaim_open_state(ops
, sp
);
895 if (status
== -NFS4ERR_NO_GRACE
) {
896 ops
= &nfs4_network_partition_recovery_ops
;
897 status
= nfs4_reclaim_open_state(ops
, sp
);
899 if (status
== -NFS4ERR_STALE_CLIENTID
)
901 if (status
== -NFS4ERR_EXPIRED
)
905 nfs_delegation_reap_unclaimed(clp
);
907 set_bit(NFS4CLNT_OK
, &clp
->cl_state
);
908 up_write(&clp
->cl_sem
);
910 wake_up_all(&clp
->cl_waitq
);
911 rpc_wake_up(&clp
->cl_rpcwaitq
);
912 if (status
== -NFS4ERR_CB_PATH_DOWN
)
913 nfs_handle_cb_pathdown(clp
);
914 nfs4_put_client(clp
);
917 printk(KERN_WARNING
"Error: state recovery failed on NFSv4 server %u.%u.%u.%u with error %d\n",
918 NIPQUAD(clp
->cl_addr
.s_addr
), -status
);