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
)
65 struct nfs4_setclientid_res clid
;
69 port
= nfs_callback_tcpport
;
70 if (clp
->cl_addr
.ss_family
== AF_INET6
)
71 port
= nfs_callback_tcpport6
;
73 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
76 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
79 clp
->cl_clientid
= clid
.clientid
;
80 nfs4_schedule_state_renewal(clp
);
85 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
87 struct rpc_cred
*cred
= NULL
;
89 if (clp
->cl_machine_cred
!= NULL
)
90 cred
= get_rpccred(clp
->cl_machine_cred
);
94 static void nfs4_clear_machine_cred(struct nfs_client
*clp
)
96 struct rpc_cred
*cred
;
98 spin_lock(&clp
->cl_lock
);
99 cred
= clp
->cl_machine_cred
;
100 clp
->cl_machine_cred
= NULL
;
101 spin_unlock(&clp
->cl_lock
);
106 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
108 struct nfs4_state_owner
*sp
;
110 struct rpc_cred
*cred
= NULL
;
112 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
113 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
114 if (list_empty(&sp
->so_states
))
116 cred
= get_rpccred(sp
->so_cred
);
122 #if defined(CONFIG_NFS_V4_1)
124 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
127 struct nfs_fsinfo fsinfo
;
129 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
131 /* Update lease time and schedule renewal */
132 spin_lock(&clp
->cl_lock
);
133 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
134 clp
->cl_last_renewal
= jiffies
;
135 spin_unlock(&clp
->cl_lock
);
137 nfs4_schedule_state_renewal(clp
);
143 static void nfs4_end_drain_session(struct nfs_client
*clp
)
145 struct nfs4_session
*ses
= clp
->cl_session
;
150 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
151 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
152 max_slots
= ses
->fc_slot_table
.max_slots
;
153 while (max_slots
--) {
154 struct rpc_task
*task
;
156 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
160 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
162 spin_unlock(&ses
->fc_slot_table
.slot_tbl_lock
);
166 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
168 struct nfs4_session
*ses
= clp
->cl_session
;
169 struct nfs4_slot_table
*tbl
= &ses
->fc_slot_table
;
171 spin_lock(&tbl
->slot_tbl_lock
);
172 set_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
);
173 if (tbl
->highest_used_slotid
!= -1) {
174 INIT_COMPLETION(ses
->complete
);
175 spin_unlock(&tbl
->slot_tbl_lock
);
176 return wait_for_completion_interruptible(&ses
->complete
);
178 spin_unlock(&tbl
->slot_tbl_lock
);
182 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
186 nfs4_begin_drain_session(clp
);
187 status
= nfs4_proc_exchange_id(clp
, cred
);
190 status
= nfs4_proc_create_session(clp
);
193 nfs41_setup_state_renewal(clp
);
194 nfs_mark_client_ready(clp
, NFS_CS_READY
);
199 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
201 struct rpc_cred
*cred
;
203 spin_lock(&clp
->cl_lock
);
204 cred
= nfs4_get_machine_cred_locked(clp
);
205 spin_unlock(&clp
->cl_lock
);
209 #endif /* CONFIG_NFS_V4_1 */
211 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
213 struct nfs4_state_owner
*sp
;
215 struct rpc_cred
*cred
;
217 spin_lock(&clp
->cl_lock
);
218 cred
= nfs4_get_machine_cred_locked(clp
);
221 pos
= rb_first(&clp
->cl_state_owners
);
223 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
224 cred
= get_rpccred(sp
->so_cred
);
227 spin_unlock(&clp
->cl_lock
);
231 static void nfs_alloc_unique_id(struct rb_root
*root
, struct nfs_unique_id
*new,
232 __u64 minval
, int maxbits
)
234 struct rb_node
**p
, *parent
;
235 struct nfs_unique_id
*pos
;
239 mask
= (1ULL << maxbits
) - 1ULL;
241 /* Ensure distribution is more or less flat */
242 get_random_bytes(&new->id
, sizeof(new->id
));
244 if (new->id
< minval
)
252 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
254 if (new->id
< pos
->id
)
256 else if (new->id
> pos
->id
)
261 rb_link_node(&new->rb_node
, parent
, p
);
262 rb_insert_color(&new->rb_node
, root
);
267 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
271 parent
= rb_next(parent
);
274 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
275 if (new->id
< pos
->id
)
281 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
283 rb_erase(&id
->rb_node
, root
);
286 static struct nfs4_state_owner
*
287 nfs4_find_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
289 struct nfs_client
*clp
= server
->nfs_client
;
290 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
292 struct nfs4_state_owner
*sp
, *res
= NULL
;
296 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
298 if (server
< sp
->so_server
) {
299 p
= &parent
->rb_left
;
302 if (server
> sp
->so_server
) {
303 p
= &parent
->rb_right
;
306 if (cred
< sp
->so_cred
)
307 p
= &parent
->rb_left
;
308 else if (cred
> sp
->so_cred
)
309 p
= &parent
->rb_right
;
311 atomic_inc(&sp
->so_count
);
319 static struct nfs4_state_owner
*
320 nfs4_insert_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*new)
322 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
324 struct nfs4_state_owner
*sp
;
328 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
330 if (new->so_server
< sp
->so_server
) {
331 p
= &parent
->rb_left
;
334 if (new->so_server
> sp
->so_server
) {
335 p
= &parent
->rb_right
;
338 if (new->so_cred
< sp
->so_cred
)
339 p
= &parent
->rb_left
;
340 else if (new->so_cred
> sp
->so_cred
)
341 p
= &parent
->rb_right
;
343 atomic_inc(&sp
->so_count
);
347 nfs_alloc_unique_id(&clp
->cl_openowner_id
, &new->so_owner_id
, 1, 64);
348 rb_link_node(&new->so_client_node
, parent
, p
);
349 rb_insert_color(&new->so_client_node
, &clp
->cl_state_owners
);
354 nfs4_remove_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*sp
)
356 if (!RB_EMPTY_NODE(&sp
->so_client_node
))
357 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
358 nfs_free_unique_id(&clp
->cl_openowner_id
, &sp
->so_owner_id
);
362 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
363 * create a new state_owner.
366 static struct nfs4_state_owner
*
367 nfs4_alloc_state_owner(void)
369 struct nfs4_state_owner
*sp
;
371 sp
= kzalloc(sizeof(*sp
),GFP_NOFS
);
374 spin_lock_init(&sp
->so_lock
);
375 INIT_LIST_HEAD(&sp
->so_states
);
376 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
377 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
378 spin_lock_init(&sp
->so_sequence
.lock
);
379 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
380 atomic_set(&sp
->so_count
, 1);
385 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
387 if (!RB_EMPTY_NODE(&sp
->so_client_node
)) {
388 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
390 spin_lock(&clp
->cl_lock
);
391 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
392 RB_CLEAR_NODE(&sp
->so_client_node
);
393 spin_unlock(&clp
->cl_lock
);
397 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
399 struct nfs_client
*clp
= server
->nfs_client
;
400 struct nfs4_state_owner
*sp
, *new;
402 spin_lock(&clp
->cl_lock
);
403 sp
= nfs4_find_state_owner(server
, cred
);
404 spin_unlock(&clp
->cl_lock
);
407 new = nfs4_alloc_state_owner();
410 new->so_server
= server
;
412 spin_lock(&clp
->cl_lock
);
413 sp
= nfs4_insert_state_owner(clp
, new);
414 spin_unlock(&clp
->cl_lock
);
418 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
424 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
426 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
427 struct rpc_cred
*cred
= sp
->so_cred
;
429 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
431 nfs4_remove_state_owner(clp
, sp
);
432 spin_unlock(&clp
->cl_lock
);
433 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
438 static struct nfs4_state
*
439 nfs4_alloc_open_state(void)
441 struct nfs4_state
*state
;
443 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
446 atomic_set(&state
->count
, 1);
447 INIT_LIST_HEAD(&state
->lock_states
);
448 spin_lock_init(&state
->state_lock
);
449 seqlock_init(&state
->seqlock
);
454 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
456 if (state
->state
== fmode
)
458 /* NB! List reordering - see the reclaim code for why. */
459 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
460 if (fmode
& FMODE_WRITE
)
461 list_move(&state
->open_states
, &state
->owner
->so_states
);
463 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
465 state
->state
= fmode
;
468 static struct nfs4_state
*
469 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
471 struct nfs_inode
*nfsi
= NFS_I(inode
);
472 struct nfs4_state
*state
;
474 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
475 if (state
->owner
!= owner
)
477 if (atomic_inc_not_zero(&state
->count
))
484 nfs4_free_open_state(struct nfs4_state
*state
)
490 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
492 struct nfs4_state
*state
, *new;
493 struct nfs_inode
*nfsi
= NFS_I(inode
);
495 spin_lock(&inode
->i_lock
);
496 state
= __nfs4_find_state_byowner(inode
, owner
);
497 spin_unlock(&inode
->i_lock
);
500 new = nfs4_alloc_open_state();
501 spin_lock(&owner
->so_lock
);
502 spin_lock(&inode
->i_lock
);
503 state
= __nfs4_find_state_byowner(inode
, owner
);
504 if (state
== NULL
&& new != NULL
) {
506 state
->owner
= owner
;
507 atomic_inc(&owner
->so_count
);
508 list_add(&state
->inode_states
, &nfsi
->open_states
);
509 state
->inode
= igrab(inode
);
510 spin_unlock(&inode
->i_lock
);
511 /* Note: The reclaim code dictates that we add stateless
512 * and read-only stateids to the end of the list */
513 list_add_tail(&state
->open_states
, &owner
->so_states
);
514 spin_unlock(&owner
->so_lock
);
516 spin_unlock(&inode
->i_lock
);
517 spin_unlock(&owner
->so_lock
);
519 nfs4_free_open_state(new);
525 void nfs4_put_open_state(struct nfs4_state
*state
)
527 struct inode
*inode
= state
->inode
;
528 struct nfs4_state_owner
*owner
= state
->owner
;
530 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
532 spin_lock(&inode
->i_lock
);
533 list_del(&state
->inode_states
);
534 list_del(&state
->open_states
);
535 spin_unlock(&inode
->i_lock
);
536 spin_unlock(&owner
->so_lock
);
538 nfs4_free_open_state(state
);
539 nfs4_put_state_owner(owner
);
543 * Close the current file.
545 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
,
546 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
548 struct nfs4_state_owner
*owner
= state
->owner
;
552 atomic_inc(&owner
->so_count
);
553 /* Protect against nfs4_find_state() */
554 spin_lock(&owner
->so_lock
);
555 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
562 case FMODE_READ
|FMODE_WRITE
:
565 newstate
= FMODE_READ
|FMODE_WRITE
;
566 if (state
->n_rdwr
== 0) {
567 if (state
->n_rdonly
== 0) {
568 newstate
&= ~FMODE_READ
;
569 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
570 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
572 if (state
->n_wronly
== 0) {
573 newstate
&= ~FMODE_WRITE
;
574 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
575 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
578 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
580 nfs4_state_set_mode_locked(state
, newstate
);
581 spin_unlock(&owner
->so_lock
);
584 nfs4_put_open_state(state
);
585 nfs4_put_state_owner(owner
);
587 nfs4_do_close(path
, state
, gfp_mask
, wait
);
590 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
592 __nfs4_close(path
, state
, fmode
, GFP_NOFS
, 0);
595 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
597 __nfs4_close(path
, state
, fmode
, GFP_KERNEL
, 1);
601 * Search the state->lock_states for an existing lock_owner
602 * that is compatible with current->files
604 static struct nfs4_lock_state
*
605 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
607 struct nfs4_lock_state
*pos
;
608 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
609 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
611 switch (pos
->ls_owner
.lo_type
) {
612 case NFS4_POSIX_LOCK_TYPE
:
613 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
616 case NFS4_FLOCK_LOCK_TYPE
:
617 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
620 atomic_inc(&pos
->ls_count
);
627 * Return a compatible lock_state. If no initialized lock_state structure
628 * exists, return an uninitialized one.
631 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
633 struct nfs4_lock_state
*lsp
;
634 struct nfs_client
*clp
= state
->owner
->so_server
->nfs_client
;
636 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
639 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
640 spin_lock_init(&lsp
->ls_sequence
.lock
);
641 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
642 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
643 atomic_set(&lsp
->ls_count
, 1);
644 lsp
->ls_state
= state
;
645 lsp
->ls_owner
.lo_type
= type
;
646 switch (lsp
->ls_owner
.lo_type
) {
647 case NFS4_FLOCK_LOCK_TYPE
:
648 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
650 case NFS4_POSIX_LOCK_TYPE
:
651 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
657 spin_lock(&clp
->cl_lock
);
658 nfs_alloc_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
, 1, 64);
659 spin_unlock(&clp
->cl_lock
);
660 INIT_LIST_HEAD(&lsp
->ls_locks
);
664 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
666 struct nfs_client
*clp
= lsp
->ls_state
->owner
->so_server
->nfs_client
;
668 spin_lock(&clp
->cl_lock
);
669 nfs_free_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
);
670 spin_unlock(&clp
->cl_lock
);
671 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
676 * Return a compatible lock_state. If no initialized lock_state structure
677 * exists, return an uninitialized one.
680 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
682 struct nfs4_lock_state
*lsp
, *new = NULL
;
685 spin_lock(&state
->state_lock
);
686 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
690 list_add(&new->ls_locks
, &state
->lock_states
);
691 set_bit(LK_STATE_IN_USE
, &state
->flags
);
696 spin_unlock(&state
->state_lock
);
697 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
701 spin_unlock(&state
->state_lock
);
703 nfs4_free_lock_state(new);
708 * Release reference to lock_state, and free it if we see that
709 * it is no longer in use
711 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
713 struct nfs4_state
*state
;
717 state
= lsp
->ls_state
;
718 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
720 list_del(&lsp
->ls_locks
);
721 if (list_empty(&state
->lock_states
))
722 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
723 spin_unlock(&state
->state_lock
);
724 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
725 nfs4_release_lockowner(lsp
);
726 nfs4_free_lock_state(lsp
);
729 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
731 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
733 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
734 atomic_inc(&lsp
->ls_count
);
737 static void nfs4_fl_release_lock(struct file_lock
*fl
)
739 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
742 static const struct file_lock_operations nfs4_fl_lock_ops
= {
743 .fl_copy_lock
= nfs4_fl_copy_lock
,
744 .fl_release_private
= nfs4_fl_release_lock
,
747 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
749 struct nfs4_lock_state
*lsp
;
751 if (fl
->fl_ops
!= NULL
)
753 if (fl
->fl_flags
& FL_POSIX
)
754 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
755 else if (fl
->fl_flags
& FL_FLOCK
)
756 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
761 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
762 fl
->fl_ops
= &nfs4_fl_lock_ops
;
767 * Byte-range lock aware utility to initialize the stateid of read/write
770 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
772 struct nfs4_lock_state
*lsp
;
776 seq
= read_seqbegin(&state
->seqlock
);
777 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
778 } while (read_seqretry(&state
->seqlock
, seq
));
779 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
782 spin_lock(&state
->state_lock
);
783 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
784 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
785 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
786 spin_unlock(&state
->state_lock
);
787 nfs4_put_lock_state(lsp
);
790 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
792 struct nfs_seqid
*new;
794 new = kmalloc(sizeof(*new), gfp_mask
);
796 new->sequence
= counter
;
797 INIT_LIST_HEAD(&new->list
);
802 void nfs_release_seqid(struct nfs_seqid
*seqid
)
804 if (!list_empty(&seqid
->list
)) {
805 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
807 spin_lock(&sequence
->lock
);
808 list_del_init(&seqid
->list
);
809 spin_unlock(&sequence
->lock
);
810 rpc_wake_up(&sequence
->wait
);
814 void nfs_free_seqid(struct nfs_seqid
*seqid
)
816 nfs_release_seqid(seqid
);
821 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
822 * failed with a seqid incrementing error -
823 * see comments nfs_fs.h:seqid_mutating_error()
825 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
827 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
831 case -NFS4ERR_BAD_SEQID
:
832 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
834 printk(KERN_WARNING
"NFS: v4 server returned a bad"
835 " sequence-id error on an"
836 " unconfirmed sequence %p!\n",
838 case -NFS4ERR_STALE_CLIENTID
:
839 case -NFS4ERR_STALE_STATEID
:
840 case -NFS4ERR_BAD_STATEID
:
841 case -NFS4ERR_BADXDR
:
842 case -NFS4ERR_RESOURCE
:
843 case -NFS4ERR_NOFILEHANDLE
:
844 /* Non-seqid mutating errors */
848 * Note: no locking needed as we are guaranteed to be first
849 * on the sequence list
851 seqid
->sequence
->counter
++;
854 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
856 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
857 struct nfs4_state_owner
, so_seqid
);
858 struct nfs_server
*server
= sp
->so_server
;
860 if (status
== -NFS4ERR_BAD_SEQID
)
861 nfs4_drop_state_owner(sp
);
862 if (!nfs4_has_session(server
->nfs_client
))
863 nfs_increment_seqid(status
, seqid
);
867 * Increment the seqid if the LOCK/LOCKU succeeded, or
868 * failed with a seqid incrementing error -
869 * see comments nfs_fs.h:seqid_mutating_error()
871 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
873 nfs_increment_seqid(status
, seqid
);
876 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
878 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
881 spin_lock(&sequence
->lock
);
882 if (list_empty(&seqid
->list
))
883 list_add_tail(&seqid
->list
, &sequence
->list
);
884 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
886 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
889 spin_unlock(&sequence
->lock
);
893 static int nfs4_run_state_manager(void *);
895 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
897 smp_mb__before_clear_bit();
898 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
899 smp_mb__after_clear_bit();
900 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
901 rpc_wake_up(&clp
->cl_rpcwaitq
);
905 * Schedule the nfs_client asynchronous state management routine
907 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
909 struct task_struct
*task
;
911 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
913 __module_get(THIS_MODULE
);
914 atomic_inc(&clp
->cl_count
);
915 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
916 rpc_peeraddr2str(clp
->cl_rpcclient
,
920 nfs4_clear_state_manager_bit(clp
);
922 module_put(THIS_MODULE
);
926 * Schedule a state recovery attempt
928 void nfs4_schedule_state_recovery(struct nfs_client
*clp
)
932 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
933 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
934 nfs4_schedule_state_manager(clp
);
937 int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
940 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
941 /* Don't recover state that expired before the reboot */
942 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
943 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
946 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
947 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
951 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
953 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
954 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
955 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
956 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
960 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
962 struct inode
*inode
= state
->inode
;
963 struct nfs_inode
*nfsi
= NFS_I(inode
);
964 struct file_lock
*fl
;
967 if (inode
->i_flock
== NULL
)
970 /* Guard against delegation returns and new lock/unlock calls */
971 down_write(&nfsi
->rwsem
);
972 /* Protect inode->i_flock using the BKL */
974 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
975 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
977 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
980 status
= ops
->recover_lock(state
, fl
);
985 case -NFS4ERR_ADMIN_REVOKED
:
986 case -NFS4ERR_STALE_STATEID
:
987 case -NFS4ERR_BAD_STATEID
:
988 case -NFS4ERR_EXPIRED
:
989 case -NFS4ERR_NO_GRACE
:
990 case -NFS4ERR_STALE_CLIENTID
:
991 case -NFS4ERR_BADSESSION
:
992 case -NFS4ERR_BADSLOT
:
993 case -NFS4ERR_BAD_HIGH_SLOT
:
994 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
997 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1000 case -NFS4ERR_DENIED
:
1001 case -NFS4ERR_RECLAIM_BAD
:
1002 case -NFS4ERR_RECLAIM_CONFLICT
:
1003 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1010 up_write(&nfsi
->rwsem
);
1014 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1016 struct nfs4_state
*state
;
1017 struct nfs4_lock_state
*lock
;
1020 /* Note: we rely on the sp->so_states list being ordered
1021 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1023 * This is needed to ensure that the server won't give us any
1024 * read delegations that we have to return if, say, we are
1025 * recovering after a network partition or a reboot from a
1026 * server that doesn't support a grace period.
1029 spin_lock(&sp
->so_lock
);
1030 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1031 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1033 if (state
->state
== 0)
1035 atomic_inc(&state
->count
);
1036 spin_unlock(&sp
->so_lock
);
1037 status
= ops
->recover_open(sp
, state
);
1039 status
= nfs4_reclaim_locks(state
, ops
);
1041 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1042 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1043 printk("%s: Lock reclaim failed!\n",
1046 nfs4_put_open_state(state
);
1052 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1058 * Open state on this file cannot be recovered
1059 * All we can do is revert to using the zero stateid.
1061 memset(state
->stateid
.data
, 0,
1062 sizeof(state
->stateid
.data
));
1063 /* Mark the file as being 'closed' */
1066 case -NFS4ERR_ADMIN_REVOKED
:
1067 case -NFS4ERR_STALE_STATEID
:
1068 case -NFS4ERR_BAD_STATEID
:
1069 case -NFS4ERR_RECLAIM_BAD
:
1070 case -NFS4ERR_RECLAIM_CONFLICT
:
1071 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1073 case -NFS4ERR_EXPIRED
:
1074 case -NFS4ERR_NO_GRACE
:
1075 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1076 case -NFS4ERR_STALE_CLIENTID
:
1077 case -NFS4ERR_BADSESSION
:
1078 case -NFS4ERR_BADSLOT
:
1079 case -NFS4ERR_BAD_HIGH_SLOT
:
1080 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1083 nfs4_put_open_state(state
);
1086 spin_unlock(&sp
->so_lock
);
1089 nfs4_put_open_state(state
);
1093 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1095 struct nfs4_lock_state
*lock
;
1097 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1098 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1099 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1100 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1101 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1102 lock
->ls_seqid
.flags
= 0;
1103 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1107 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
, int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1109 struct nfs4_state_owner
*sp
;
1110 struct rb_node
*pos
;
1111 struct nfs4_state
*state
;
1113 /* Reset all sequence ids to zero */
1114 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1115 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1116 sp
->so_seqid
.flags
= 0;
1117 spin_lock(&sp
->so_lock
);
1118 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1119 if (mark_reclaim(clp
, state
))
1120 nfs4_clear_open_state(state
);
1122 spin_unlock(&sp
->so_lock
);
1126 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1128 /* Mark all delegations for reclaim */
1129 nfs_delegation_mark_reclaim(clp
);
1130 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1133 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1134 const struct nfs4_state_recovery_ops
*ops
)
1136 /* Notify the server we're done reclaiming our state */
1137 if (ops
->reclaim_complete
)
1138 (void)ops
->reclaim_complete(clp
);
1141 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1143 struct nfs4_state_owner
*sp
;
1144 struct rb_node
*pos
;
1145 struct nfs4_state
*state
;
1147 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1150 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1152 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1153 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1154 spin_lock(&sp
->so_lock
);
1155 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1156 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
))
1158 nfs4_state_mark_reclaim_nograce(clp
, state
);
1160 spin_unlock(&sp
->so_lock
);
1163 nfs_delegation_reap_unclaimed(clp
);
1166 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1168 nfs_delegation_mark_reclaim(clp
);
1169 nfs_delegation_reap_unclaimed(clp
);
1172 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1174 nfs_delegation_clear_all(clp
);
1175 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1178 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1181 case -NFS4ERR_CB_PATH_DOWN
:
1182 nfs_handle_cb_pathdown(clp
);
1184 case -NFS4ERR_NO_GRACE
:
1185 nfs4_state_end_reclaim_reboot(clp
);
1187 case -NFS4ERR_STALE_CLIENTID
:
1188 case -NFS4ERR_LEASE_MOVED
:
1189 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1190 nfs4_state_end_reclaim_reboot(clp
);
1191 nfs4_state_start_reclaim_reboot(clp
);
1193 case -NFS4ERR_EXPIRED
:
1194 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1195 nfs4_state_start_reclaim_nograce(clp
);
1197 case -NFS4ERR_BADSESSION
:
1198 case -NFS4ERR_BADSLOT
:
1199 case -NFS4ERR_BAD_HIGH_SLOT
:
1200 case -NFS4ERR_DEADSESSION
:
1201 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1202 case -NFS4ERR_SEQ_FALSE_RETRY
:
1203 case -NFS4ERR_SEQ_MISORDERED
:
1204 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1205 /* Zero session reset errors */
1211 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1213 struct rb_node
*pos
;
1217 spin_lock(&clp
->cl_lock
);
1218 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1219 struct nfs4_state_owner
*sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1220 if (!test_and_clear_bit(ops
->owner_flag_bit
, &sp
->so_flags
))
1222 atomic_inc(&sp
->so_count
);
1223 spin_unlock(&clp
->cl_lock
);
1224 status
= nfs4_reclaim_open_state(sp
, ops
);
1226 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1227 nfs4_put_state_owner(sp
);
1228 return nfs4_recovery_handle_error(clp
, status
);
1230 nfs4_put_state_owner(sp
);
1233 spin_unlock(&clp
->cl_lock
);
1237 static int nfs4_check_lease(struct nfs_client
*clp
)
1239 struct rpc_cred
*cred
;
1240 const struct nfs4_state_maintenance_ops
*ops
=
1241 clp
->cl_mvops
->state_renewal_ops
;
1242 int status
= -NFS4ERR_EXPIRED
;
1244 /* Is the client already known to have an expired lease? */
1245 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1247 spin_lock(&clp
->cl_lock
);
1248 cred
= ops
->get_state_renewal_cred_locked(clp
);
1249 spin_unlock(&clp
->cl_lock
);
1251 cred
= nfs4_get_setclientid_cred(clp
);
1255 status
= ops
->renew_lease(clp
, cred
);
1258 return nfs4_recovery_handle_error(clp
, status
);
1261 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1263 struct rpc_cred
*cred
;
1264 const struct nfs4_state_recovery_ops
*ops
=
1265 clp
->cl_mvops
->reboot_recovery_ops
;
1266 int status
= -ENOENT
;
1268 cred
= ops
->get_clid_cred(clp
);
1270 status
= ops
->establish_clid(clp
, cred
);
1272 /* Handle case where the user hasn't set up machine creds */
1273 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1274 nfs4_clear_machine_cred(clp
);
1277 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1278 status
= -EPROTONOSUPPORT
;
1283 #ifdef CONFIG_NFS_V4_1
1284 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1286 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1287 nfs4_schedule_state_recovery(clp
);
1290 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1292 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1293 clp
->cl_boot_time
= CURRENT_TIME
;
1294 nfs4_state_start_reclaim_nograce(clp
);
1295 nfs4_schedule_state_recovery(clp
);
1299 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1301 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1302 nfs4_state_start_reclaim_reboot(clp
);
1303 nfs4_schedule_state_recovery(clp
);
1307 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1310 nfs4_reset_all_state(clp
);
1313 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1315 /* This will need to handle layouts too */
1316 nfs_expire_all_delegations(clp
);
1319 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1321 nfs_expire_all_delegations(clp
);
1322 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1323 nfs4_schedule_state_recovery(clp
);
1326 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1330 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1331 nfs41_handle_server_reboot(clp
);
1332 else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1333 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1334 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1335 SEQ4_STATUS_LEASE_MOVED
))
1336 nfs41_handle_state_revoked(clp
);
1337 else if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1338 nfs41_handle_recallable_state_revoked(clp
);
1339 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1340 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1341 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1342 nfs41_handle_cb_path_down(clp
);
1345 static int nfs4_reset_session(struct nfs_client
*clp
)
1349 nfs4_begin_drain_session(clp
);
1350 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1351 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1352 status
!= -NFS4ERR_DEADSESSION
) {
1353 status
= nfs4_recovery_handle_error(clp
, status
);
1357 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1358 status
= nfs4_proc_create_session(clp
);
1360 status
= nfs4_recovery_handle_error(clp
, status
);
1363 /* create_session negotiated new slot table */
1364 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1366 /* Let the state manager reestablish state */
1367 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1368 nfs41_setup_state_renewal(clp
);
1373 static int nfs4_recall_slot(struct nfs_client
*clp
)
1375 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1376 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1377 struct nfs4_slot
*new, *old
;
1380 nfs4_begin_drain_session(clp
);
1381 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1386 spin_lock(&fc_tbl
->slot_tbl_lock
);
1387 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1388 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1389 old
= fc_tbl
->slots
;
1390 fc_tbl
->slots
= new;
1391 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1392 fc_tbl
->target_max_slots
= 0;
1393 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1394 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1397 nfs4_end_drain_session(clp
);
1401 #else /* CONFIG_NFS_V4_1 */
1402 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1403 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1404 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1405 #endif /* CONFIG_NFS_V4_1 */
1407 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1408 * on EXCHANGE_ID for v4.1
1410 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1412 if (nfs4_has_session(clp
)) {
1414 case -NFS4ERR_DELAY
:
1415 case -NFS4ERR_CLID_INUSE
:
1420 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1421 * in nfs4_exchange_id */
1426 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1429 static void nfs4_state_manager(struct nfs_client
*clp
)
1433 /* Ensure exclusive access to NFSv4 state */
1435 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1436 /* We're going to have to re-establish a clientid */
1437 status
= nfs4_reclaim_lease(clp
);
1439 nfs4_set_lease_expired(clp
, status
);
1440 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1443 if (clp
->cl_cons_state
==
1444 NFS_CS_SESSION_INITING
)
1445 nfs_mark_client_ready(clp
, status
);
1448 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1449 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1452 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1453 status
= nfs4_check_lease(clp
);
1454 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1456 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1460 /* Initialize or reset the session */
1461 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1462 && nfs4_has_session(clp
)) {
1463 status
= nfs4_reset_session(clp
);
1464 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1470 /* First recover reboot state... */
1471 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1472 status
= nfs4_do_reclaim(clp
,
1473 clp
->cl_mvops
->reboot_recovery_ops
);
1474 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1475 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1477 nfs4_state_end_reclaim_reboot(clp
);
1478 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1484 /* Now recover expired state... */
1485 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1486 status
= nfs4_do_reclaim(clp
,
1487 clp
->cl_mvops
->nograce_recovery_ops
);
1488 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1489 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1490 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1496 nfs4_end_drain_session(clp
);
1497 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1498 nfs_client_return_marked_delegations(clp
);
1501 /* Recall session slots */
1502 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1503 && nfs4_has_session(clp
)) {
1504 status
= nfs4_recall_slot(clp
);
1511 nfs4_clear_state_manager_bit(clp
);
1512 /* Did we race with an attempt to give us more work? */
1513 if (clp
->cl_state
== 0)
1515 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1520 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1521 " with error %d\n", clp
->cl_hostname
, -status
);
1522 nfs4_end_drain_session(clp
);
1523 nfs4_clear_state_manager_bit(clp
);
1526 static int nfs4_run_state_manager(void *ptr
)
1528 struct nfs_client
*clp
= ptr
;
1530 allow_signal(SIGKILL
);
1531 nfs4_state_manager(clp
);
1532 nfs_put_client(clp
);
1533 module_put_and_exit(0);