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>
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/ratelimit.h>
50 #include <linux/workqueue.h>
51 #include <linux/bitops.h>
55 #include "delegation.h"
59 #define OPENOWNER_POOL_SIZE 8
61 const nfs4_stateid zero_stateid
;
63 static LIST_HEAD(nfs4_clientid_list
);
65 int nfs4_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
67 struct nfs4_setclientid_res clid
;
71 port
= nfs_callback_tcpport
;
72 if (clp
->cl_addr
.ss_family
== AF_INET6
)
73 port
= nfs_callback_tcpport6
;
75 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
78 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
81 clp
->cl_clientid
= clid
.clientid
;
82 nfs4_schedule_state_renewal(clp
);
87 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
89 struct rpc_cred
*cred
= NULL
;
91 if (clp
->cl_machine_cred
!= NULL
)
92 cred
= get_rpccred(clp
->cl_machine_cred
);
96 static void nfs4_clear_machine_cred(struct nfs_client
*clp
)
98 struct rpc_cred
*cred
;
100 spin_lock(&clp
->cl_lock
);
101 cred
= clp
->cl_machine_cred
;
102 clp
->cl_machine_cred
= NULL
;
103 spin_unlock(&clp
->cl_lock
);
108 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
110 struct nfs4_state_owner
*sp
;
112 struct rpc_cred
*cred
= NULL
;
114 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
115 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
116 if (list_empty(&sp
->so_states
))
118 cred
= get_rpccred(sp
->so_cred
);
124 #if defined(CONFIG_NFS_V4_1)
126 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
129 struct nfs_fsinfo fsinfo
;
131 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
133 /* Update lease time and schedule renewal */
134 spin_lock(&clp
->cl_lock
);
135 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
136 clp
->cl_last_renewal
= jiffies
;
137 spin_unlock(&clp
->cl_lock
);
139 nfs4_schedule_state_renewal(clp
);
145 static void nfs4_end_drain_session(struct nfs_client
*clp
)
147 struct nfs4_session
*ses
= clp
->cl_session
;
152 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
153 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
154 max_slots
= ses
->fc_slot_table
.max_slots
;
155 while (max_slots
--) {
156 struct rpc_task
*task
;
158 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
162 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
164 spin_unlock(&ses
->fc_slot_table
.slot_tbl_lock
);
168 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
170 struct nfs4_session
*ses
= clp
->cl_session
;
171 struct nfs4_slot_table
*tbl
= &ses
->fc_slot_table
;
173 spin_lock(&tbl
->slot_tbl_lock
);
174 set_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
);
175 if (tbl
->highest_used_slotid
!= -1) {
176 INIT_COMPLETION(ses
->complete
);
177 spin_unlock(&tbl
->slot_tbl_lock
);
178 return wait_for_completion_interruptible(&ses
->complete
);
180 spin_unlock(&tbl
->slot_tbl_lock
);
184 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
188 nfs4_begin_drain_session(clp
);
189 status
= nfs4_proc_exchange_id(clp
, cred
);
192 status
= nfs4_proc_create_session(clp
);
195 nfs41_setup_state_renewal(clp
);
196 nfs_mark_client_ready(clp
, NFS_CS_READY
);
201 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
203 struct rpc_cred
*cred
;
205 spin_lock(&clp
->cl_lock
);
206 cred
= nfs4_get_machine_cred_locked(clp
);
207 spin_unlock(&clp
->cl_lock
);
211 #endif /* CONFIG_NFS_V4_1 */
213 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
215 struct nfs4_state_owner
*sp
;
217 struct rpc_cred
*cred
;
219 spin_lock(&clp
->cl_lock
);
220 cred
= nfs4_get_machine_cred_locked(clp
);
223 pos
= rb_first(&clp
->cl_state_owners
);
225 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
226 cred
= get_rpccred(sp
->so_cred
);
229 spin_unlock(&clp
->cl_lock
);
233 static void nfs_alloc_unique_id(struct rb_root
*root
, struct nfs_unique_id
*new,
234 __u64 minval
, int maxbits
)
236 struct rb_node
**p
, *parent
;
237 struct nfs_unique_id
*pos
;
241 mask
= (1ULL << maxbits
) - 1ULL;
243 /* Ensure distribution is more or less flat */
244 get_random_bytes(&new->id
, sizeof(new->id
));
246 if (new->id
< minval
)
254 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
256 if (new->id
< pos
->id
)
258 else if (new->id
> pos
->id
)
263 rb_link_node(&new->rb_node
, parent
, p
);
264 rb_insert_color(&new->rb_node
, root
);
269 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
273 parent
= rb_next(parent
);
276 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
277 if (new->id
< pos
->id
)
283 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
285 rb_erase(&id
->rb_node
, root
);
288 static struct nfs4_state_owner
*
289 nfs4_find_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
291 struct nfs_client
*clp
= server
->nfs_client
;
292 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
294 struct nfs4_state_owner
*sp
, *res
= NULL
;
298 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
300 if (server
< sp
->so_server
) {
301 p
= &parent
->rb_left
;
304 if (server
> sp
->so_server
) {
305 p
= &parent
->rb_right
;
308 if (cred
< sp
->so_cred
)
309 p
= &parent
->rb_left
;
310 else if (cred
> sp
->so_cred
)
311 p
= &parent
->rb_right
;
313 atomic_inc(&sp
->so_count
);
321 static struct nfs4_state_owner
*
322 nfs4_insert_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*new)
324 struct rb_node
**p
= &clp
->cl_state_owners
.rb_node
,
326 struct nfs4_state_owner
*sp
;
330 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_client_node
);
332 if (new->so_server
< sp
->so_server
) {
333 p
= &parent
->rb_left
;
336 if (new->so_server
> sp
->so_server
) {
337 p
= &parent
->rb_right
;
340 if (new->so_cred
< sp
->so_cred
)
341 p
= &parent
->rb_left
;
342 else if (new->so_cred
> sp
->so_cred
)
343 p
= &parent
->rb_right
;
345 atomic_inc(&sp
->so_count
);
349 nfs_alloc_unique_id(&clp
->cl_openowner_id
, &new->so_owner_id
, 1, 64);
350 rb_link_node(&new->so_client_node
, parent
, p
);
351 rb_insert_color(&new->so_client_node
, &clp
->cl_state_owners
);
356 nfs4_remove_state_owner(struct nfs_client
*clp
, struct nfs4_state_owner
*sp
)
358 if (!RB_EMPTY_NODE(&sp
->so_client_node
))
359 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
360 nfs_free_unique_id(&clp
->cl_openowner_id
, &sp
->so_owner_id
);
364 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
365 * create a new state_owner.
368 static struct nfs4_state_owner
*
369 nfs4_alloc_state_owner(void)
371 struct nfs4_state_owner
*sp
;
373 sp
= kzalloc(sizeof(*sp
),GFP_NOFS
);
376 spin_lock_init(&sp
->so_lock
);
377 INIT_LIST_HEAD(&sp
->so_states
);
378 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
379 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
380 spin_lock_init(&sp
->so_sequence
.lock
);
381 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
382 atomic_set(&sp
->so_count
, 1);
387 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
389 if (!RB_EMPTY_NODE(&sp
->so_client_node
)) {
390 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
392 spin_lock(&clp
->cl_lock
);
393 rb_erase(&sp
->so_client_node
, &clp
->cl_state_owners
);
394 RB_CLEAR_NODE(&sp
->so_client_node
);
395 spin_unlock(&clp
->cl_lock
);
399 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
, struct rpc_cred
*cred
)
401 struct nfs_client
*clp
= server
->nfs_client
;
402 struct nfs4_state_owner
*sp
, *new;
404 spin_lock(&clp
->cl_lock
);
405 sp
= nfs4_find_state_owner(server
, cred
);
406 spin_unlock(&clp
->cl_lock
);
409 new = nfs4_alloc_state_owner();
412 new->so_server
= server
;
414 spin_lock(&clp
->cl_lock
);
415 sp
= nfs4_insert_state_owner(clp
, new);
416 spin_unlock(&clp
->cl_lock
);
420 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
426 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
428 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
429 struct rpc_cred
*cred
= sp
->so_cred
;
431 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
433 nfs4_remove_state_owner(clp
, sp
);
434 spin_unlock(&clp
->cl_lock
);
435 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
440 static struct nfs4_state
*
441 nfs4_alloc_open_state(void)
443 struct nfs4_state
*state
;
445 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
448 atomic_set(&state
->count
, 1);
449 INIT_LIST_HEAD(&state
->lock_states
);
450 spin_lock_init(&state
->state_lock
);
451 seqlock_init(&state
->seqlock
);
456 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
458 if (state
->state
== fmode
)
460 /* NB! List reordering - see the reclaim code for why. */
461 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
462 if (fmode
& FMODE_WRITE
)
463 list_move(&state
->open_states
, &state
->owner
->so_states
);
465 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
467 state
->state
= fmode
;
470 static struct nfs4_state
*
471 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
473 struct nfs_inode
*nfsi
= NFS_I(inode
);
474 struct nfs4_state
*state
;
476 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
477 if (state
->owner
!= owner
)
479 if (atomic_inc_not_zero(&state
->count
))
486 nfs4_free_open_state(struct nfs4_state
*state
)
492 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
494 struct nfs4_state
*state
, *new;
495 struct nfs_inode
*nfsi
= NFS_I(inode
);
497 spin_lock(&inode
->i_lock
);
498 state
= __nfs4_find_state_byowner(inode
, owner
);
499 spin_unlock(&inode
->i_lock
);
502 new = nfs4_alloc_open_state();
503 spin_lock(&owner
->so_lock
);
504 spin_lock(&inode
->i_lock
);
505 state
= __nfs4_find_state_byowner(inode
, owner
);
506 if (state
== NULL
&& new != NULL
) {
508 state
->owner
= owner
;
509 atomic_inc(&owner
->so_count
);
510 list_add(&state
->inode_states
, &nfsi
->open_states
);
511 state
->inode
= igrab(inode
);
512 spin_unlock(&inode
->i_lock
);
513 /* Note: The reclaim code dictates that we add stateless
514 * and read-only stateids to the end of the list */
515 list_add_tail(&state
->open_states
, &owner
->so_states
);
516 spin_unlock(&owner
->so_lock
);
518 spin_unlock(&inode
->i_lock
);
519 spin_unlock(&owner
->so_lock
);
521 nfs4_free_open_state(new);
527 void nfs4_put_open_state(struct nfs4_state
*state
)
529 struct inode
*inode
= state
->inode
;
530 struct nfs4_state_owner
*owner
= state
->owner
;
532 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
534 spin_lock(&inode
->i_lock
);
535 list_del(&state
->inode_states
);
536 list_del(&state
->open_states
);
537 spin_unlock(&inode
->i_lock
);
538 spin_unlock(&owner
->so_lock
);
540 nfs4_free_open_state(state
);
541 nfs4_put_state_owner(owner
);
545 * Close the current file.
547 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
,
548 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
550 struct nfs4_state_owner
*owner
= state
->owner
;
554 atomic_inc(&owner
->so_count
);
555 /* Protect against nfs4_find_state() */
556 spin_lock(&owner
->so_lock
);
557 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
564 case FMODE_READ
|FMODE_WRITE
:
567 newstate
= FMODE_READ
|FMODE_WRITE
;
568 if (state
->n_rdwr
== 0) {
569 if (state
->n_rdonly
== 0) {
570 newstate
&= ~FMODE_READ
;
571 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
572 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
574 if (state
->n_wronly
== 0) {
575 newstate
&= ~FMODE_WRITE
;
576 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
577 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
580 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
582 nfs4_state_set_mode_locked(state
, newstate
);
583 spin_unlock(&owner
->so_lock
);
586 nfs4_put_open_state(state
);
587 nfs4_put_state_owner(owner
);
589 nfs4_do_close(path
, state
, gfp_mask
, wait
);
592 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
594 __nfs4_close(path
, state
, fmode
, GFP_NOFS
, 0);
597 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
599 __nfs4_close(path
, state
, fmode
, GFP_KERNEL
, 1);
603 * Search the state->lock_states for an existing lock_owner
604 * that is compatible with current->files
606 static struct nfs4_lock_state
*
607 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
609 struct nfs4_lock_state
*pos
;
610 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
611 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
613 switch (pos
->ls_owner
.lo_type
) {
614 case NFS4_POSIX_LOCK_TYPE
:
615 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
618 case NFS4_FLOCK_LOCK_TYPE
:
619 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
622 atomic_inc(&pos
->ls_count
);
629 * Return a compatible lock_state. If no initialized lock_state structure
630 * exists, return an uninitialized one.
633 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
)
635 struct nfs4_lock_state
*lsp
;
636 struct nfs_client
*clp
= state
->owner
->so_server
->nfs_client
;
638 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
641 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
642 spin_lock_init(&lsp
->ls_sequence
.lock
);
643 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
644 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
645 atomic_set(&lsp
->ls_count
, 1);
646 lsp
->ls_state
= state
;
647 lsp
->ls_owner
.lo_type
= type
;
648 switch (lsp
->ls_owner
.lo_type
) {
649 case NFS4_FLOCK_LOCK_TYPE
:
650 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
652 case NFS4_POSIX_LOCK_TYPE
:
653 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
659 spin_lock(&clp
->cl_lock
);
660 nfs_alloc_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
, 1, 64);
661 spin_unlock(&clp
->cl_lock
);
662 INIT_LIST_HEAD(&lsp
->ls_locks
);
666 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
668 struct nfs_client
*clp
= lsp
->ls_state
->owner
->so_server
->nfs_client
;
670 spin_lock(&clp
->cl_lock
);
671 nfs_free_unique_id(&clp
->cl_lockowner_id
, &lsp
->ls_id
);
672 spin_unlock(&clp
->cl_lock
);
673 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
678 * Return a compatible lock_state. If no initialized lock_state structure
679 * exists, return an uninitialized one.
682 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
684 struct nfs4_lock_state
*lsp
, *new = NULL
;
687 spin_lock(&state
->state_lock
);
688 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
692 list_add(&new->ls_locks
, &state
->lock_states
);
693 set_bit(LK_STATE_IN_USE
, &state
->flags
);
698 spin_unlock(&state
->state_lock
);
699 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
703 spin_unlock(&state
->state_lock
);
705 nfs4_free_lock_state(new);
710 * Release reference to lock_state, and free it if we see that
711 * it is no longer in use
713 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
715 struct nfs4_state
*state
;
719 state
= lsp
->ls_state
;
720 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
722 list_del(&lsp
->ls_locks
);
723 if (list_empty(&state
->lock_states
))
724 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
725 spin_unlock(&state
->state_lock
);
726 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
727 nfs4_release_lockowner(lsp
);
728 nfs4_free_lock_state(lsp
);
731 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
733 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
735 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
736 atomic_inc(&lsp
->ls_count
);
739 static void nfs4_fl_release_lock(struct file_lock
*fl
)
741 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
744 static const struct file_lock_operations nfs4_fl_lock_ops
= {
745 .fl_copy_lock
= nfs4_fl_copy_lock
,
746 .fl_release_private
= nfs4_fl_release_lock
,
749 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
751 struct nfs4_lock_state
*lsp
;
753 if (fl
->fl_ops
!= NULL
)
755 if (fl
->fl_flags
& FL_POSIX
)
756 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
757 else if (fl
->fl_flags
& FL_FLOCK
)
758 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
763 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
764 fl
->fl_ops
= &nfs4_fl_lock_ops
;
769 * Byte-range lock aware utility to initialize the stateid of read/write
772 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
774 struct nfs4_lock_state
*lsp
;
778 seq
= read_seqbegin(&state
->seqlock
);
779 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
780 } while (read_seqretry(&state
->seqlock
, seq
));
781 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
784 spin_lock(&state
->state_lock
);
785 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
786 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
787 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
788 spin_unlock(&state
->state_lock
);
789 nfs4_put_lock_state(lsp
);
792 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
794 struct nfs_seqid
*new;
796 new = kmalloc(sizeof(*new), gfp_mask
);
798 new->sequence
= counter
;
799 INIT_LIST_HEAD(&new->list
);
804 void nfs_release_seqid(struct nfs_seqid
*seqid
)
806 if (!list_empty(&seqid
->list
)) {
807 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
809 spin_lock(&sequence
->lock
);
810 list_del_init(&seqid
->list
);
811 spin_unlock(&sequence
->lock
);
812 rpc_wake_up(&sequence
->wait
);
816 void nfs_free_seqid(struct nfs_seqid
*seqid
)
818 nfs_release_seqid(seqid
);
823 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
824 * failed with a seqid incrementing error -
825 * see comments nfs_fs.h:seqid_mutating_error()
827 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
829 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
833 case -NFS4ERR_BAD_SEQID
:
834 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
836 printk(KERN_WARNING
"NFS: v4 server returned a bad"
837 " sequence-id error on an"
838 " unconfirmed sequence %p!\n",
840 case -NFS4ERR_STALE_CLIENTID
:
841 case -NFS4ERR_STALE_STATEID
:
842 case -NFS4ERR_BAD_STATEID
:
843 case -NFS4ERR_BADXDR
:
844 case -NFS4ERR_RESOURCE
:
845 case -NFS4ERR_NOFILEHANDLE
:
846 /* Non-seqid mutating errors */
850 * Note: no locking needed as we are guaranteed to be first
851 * on the sequence list
853 seqid
->sequence
->counter
++;
856 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
858 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
859 struct nfs4_state_owner
, so_seqid
);
860 struct nfs_server
*server
= sp
->so_server
;
862 if (status
== -NFS4ERR_BAD_SEQID
)
863 nfs4_drop_state_owner(sp
);
864 if (!nfs4_has_session(server
->nfs_client
))
865 nfs_increment_seqid(status
, seqid
);
869 * Increment the seqid if the LOCK/LOCKU succeeded, or
870 * failed with a seqid incrementing error -
871 * see comments nfs_fs.h:seqid_mutating_error()
873 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
875 nfs_increment_seqid(status
, seqid
);
878 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
880 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
883 spin_lock(&sequence
->lock
);
884 if (list_empty(&seqid
->list
))
885 list_add_tail(&seqid
->list
, &sequence
->list
);
886 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
888 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
891 spin_unlock(&sequence
->lock
);
895 static int nfs4_run_state_manager(void *);
897 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
899 smp_mb__before_clear_bit();
900 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
901 smp_mb__after_clear_bit();
902 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
903 rpc_wake_up(&clp
->cl_rpcwaitq
);
907 * Schedule the nfs_client asynchronous state management routine
909 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
911 struct task_struct
*task
;
913 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
915 __module_get(THIS_MODULE
);
916 atomic_inc(&clp
->cl_count
);
917 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
918 rpc_peeraddr2str(clp
->cl_rpcclient
,
922 nfs4_clear_state_manager_bit(clp
);
924 module_put(THIS_MODULE
);
928 * Schedule a state recovery attempt
930 void nfs4_schedule_state_recovery(struct nfs_client
*clp
)
934 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
935 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
936 nfs4_schedule_state_manager(clp
);
939 int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
942 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
943 /* Don't recover state that expired before the reboot */
944 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
945 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
948 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
949 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
953 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
955 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
956 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
957 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
958 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
962 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
964 struct inode
*inode
= state
->inode
;
965 struct nfs_inode
*nfsi
= NFS_I(inode
);
966 struct file_lock
*fl
;
969 if (inode
->i_flock
== NULL
)
972 /* Guard against delegation returns and new lock/unlock calls */
973 down_write(&nfsi
->rwsem
);
974 /* Protect inode->i_flock using the BKL */
976 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
977 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
979 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
982 status
= ops
->recover_lock(state
, fl
);
987 case -NFS4ERR_ADMIN_REVOKED
:
988 case -NFS4ERR_STALE_STATEID
:
989 case -NFS4ERR_BAD_STATEID
:
990 case -NFS4ERR_EXPIRED
:
991 case -NFS4ERR_NO_GRACE
:
992 case -NFS4ERR_STALE_CLIENTID
:
993 case -NFS4ERR_BADSESSION
:
994 case -NFS4ERR_BADSLOT
:
995 case -NFS4ERR_BAD_HIGH_SLOT
:
996 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
999 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1002 case -NFS4ERR_DENIED
:
1003 case -NFS4ERR_RECLAIM_BAD
:
1004 case -NFS4ERR_RECLAIM_CONFLICT
:
1005 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1012 up_write(&nfsi
->rwsem
);
1016 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1018 struct nfs4_state
*state
;
1019 struct nfs4_lock_state
*lock
;
1022 /* Note: we rely on the sp->so_states list being ordered
1023 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1025 * This is needed to ensure that the server won't give us any
1026 * read delegations that we have to return if, say, we are
1027 * recovering after a network partition or a reboot from a
1028 * server that doesn't support a grace period.
1031 spin_lock(&sp
->so_lock
);
1032 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1033 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1035 if (state
->state
== 0)
1037 atomic_inc(&state
->count
);
1038 spin_unlock(&sp
->so_lock
);
1039 status
= ops
->recover_open(sp
, state
);
1041 status
= nfs4_reclaim_locks(state
, ops
);
1043 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1044 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1045 printk("%s: Lock reclaim failed!\n",
1048 nfs4_put_open_state(state
);
1054 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1060 * Open state on this file cannot be recovered
1061 * All we can do is revert to using the zero stateid.
1063 memset(state
->stateid
.data
, 0,
1064 sizeof(state
->stateid
.data
));
1065 /* Mark the file as being 'closed' */
1070 * User RPCSEC_GSS context has expired.
1071 * We cannot recover this stateid now, so
1072 * skip it and allow recovery thread to
1076 case -NFS4ERR_ADMIN_REVOKED
:
1077 case -NFS4ERR_STALE_STATEID
:
1078 case -NFS4ERR_BAD_STATEID
:
1079 case -NFS4ERR_RECLAIM_BAD
:
1080 case -NFS4ERR_RECLAIM_CONFLICT
:
1081 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1083 case -NFS4ERR_EXPIRED
:
1084 case -NFS4ERR_NO_GRACE
:
1085 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1086 case -NFS4ERR_STALE_CLIENTID
:
1087 case -NFS4ERR_BADSESSION
:
1088 case -NFS4ERR_BADSLOT
:
1089 case -NFS4ERR_BAD_HIGH_SLOT
:
1090 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1093 nfs4_put_open_state(state
);
1096 spin_unlock(&sp
->so_lock
);
1099 nfs4_put_open_state(state
);
1103 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1105 struct nfs4_lock_state
*lock
;
1107 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1108 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1109 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1110 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1111 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1112 lock
->ls_seqid
.flags
= 0;
1113 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1117 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
, int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1119 struct nfs4_state_owner
*sp
;
1120 struct rb_node
*pos
;
1121 struct nfs4_state
*state
;
1123 /* Reset all sequence ids to zero */
1124 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1125 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1126 sp
->so_seqid
.flags
= 0;
1127 spin_lock(&sp
->so_lock
);
1128 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1129 if (mark_reclaim(clp
, state
))
1130 nfs4_clear_open_state(state
);
1132 spin_unlock(&sp
->so_lock
);
1136 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1138 /* Mark all delegations for reclaim */
1139 nfs_delegation_mark_reclaim(clp
);
1140 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1143 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1144 const struct nfs4_state_recovery_ops
*ops
)
1146 /* Notify the server we're done reclaiming our state */
1147 if (ops
->reclaim_complete
)
1148 (void)ops
->reclaim_complete(clp
);
1151 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1153 struct nfs4_state_owner
*sp
;
1154 struct rb_node
*pos
;
1155 struct nfs4_state
*state
;
1157 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1160 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1161 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1162 spin_lock(&sp
->so_lock
);
1163 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1164 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
))
1166 nfs4_state_mark_reclaim_nograce(clp
, state
);
1168 spin_unlock(&sp
->so_lock
);
1171 nfs_delegation_reap_unclaimed(clp
);
1175 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1177 if (!nfs4_state_clear_reclaim_reboot(clp
))
1179 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1182 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1184 nfs_delegation_mark_reclaim(clp
);
1185 nfs_delegation_reap_unclaimed(clp
);
1188 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1190 nfs_delegation_clear_all(clp
);
1191 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1194 static void nfs4_warn_keyexpired(const char *s
)
1196 printk_ratelimited(KERN_WARNING
"Error: state manager"
1197 " encountered RPCSEC_GSS session"
1198 " expired against NFSv4 server %s.\n",
1202 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1205 case -NFS4ERR_CB_PATH_DOWN
:
1206 nfs_handle_cb_pathdown(clp
);
1208 case -NFS4ERR_NO_GRACE
:
1209 nfs4_state_end_reclaim_reboot(clp
);
1211 case -NFS4ERR_STALE_CLIENTID
:
1212 case -NFS4ERR_LEASE_MOVED
:
1213 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1214 nfs4_state_clear_reclaim_reboot(clp
);
1215 nfs4_state_start_reclaim_reboot(clp
);
1217 case -NFS4ERR_EXPIRED
:
1218 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1219 nfs4_state_start_reclaim_nograce(clp
);
1221 case -NFS4ERR_BADSESSION
:
1222 case -NFS4ERR_BADSLOT
:
1223 case -NFS4ERR_BAD_HIGH_SLOT
:
1224 case -NFS4ERR_DEADSESSION
:
1225 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1226 case -NFS4ERR_SEQ_FALSE_RETRY
:
1227 case -NFS4ERR_SEQ_MISORDERED
:
1228 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1229 /* Zero session reset errors */
1232 /* Nothing we can do */
1233 nfs4_warn_keyexpired(clp
->cl_hostname
);
1239 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1241 struct rb_node
*pos
;
1245 spin_lock(&clp
->cl_lock
);
1246 for (pos
= rb_first(&clp
->cl_state_owners
); pos
!= NULL
; pos
= rb_next(pos
)) {
1247 struct nfs4_state_owner
*sp
= rb_entry(pos
, struct nfs4_state_owner
, so_client_node
);
1248 if (!test_and_clear_bit(ops
->owner_flag_bit
, &sp
->so_flags
))
1250 atomic_inc(&sp
->so_count
);
1251 spin_unlock(&clp
->cl_lock
);
1252 status
= nfs4_reclaim_open_state(sp
, ops
);
1254 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1255 nfs4_put_state_owner(sp
);
1256 return nfs4_recovery_handle_error(clp
, status
);
1258 nfs4_put_state_owner(sp
);
1261 spin_unlock(&clp
->cl_lock
);
1265 static int nfs4_check_lease(struct nfs_client
*clp
)
1267 struct rpc_cred
*cred
;
1268 const struct nfs4_state_maintenance_ops
*ops
=
1269 clp
->cl_mvops
->state_renewal_ops
;
1270 int status
= -NFS4ERR_EXPIRED
;
1272 /* Is the client already known to have an expired lease? */
1273 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1275 spin_lock(&clp
->cl_lock
);
1276 cred
= ops
->get_state_renewal_cred_locked(clp
);
1277 spin_unlock(&clp
->cl_lock
);
1279 cred
= nfs4_get_setclientid_cred(clp
);
1283 status
= ops
->renew_lease(clp
, cred
);
1286 return nfs4_recovery_handle_error(clp
, status
);
1289 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1291 struct rpc_cred
*cred
;
1292 const struct nfs4_state_recovery_ops
*ops
=
1293 clp
->cl_mvops
->reboot_recovery_ops
;
1294 int status
= -ENOENT
;
1296 cred
= ops
->get_clid_cred(clp
);
1298 status
= ops
->establish_clid(clp
, cred
);
1300 /* Handle case where the user hasn't set up machine creds */
1301 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1302 nfs4_clear_machine_cred(clp
);
1305 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1306 status
= -EPROTONOSUPPORT
;
1311 #ifdef CONFIG_NFS_V4_1
1312 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1314 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1315 nfs4_schedule_state_recovery(clp
);
1318 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1320 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1321 clp
->cl_boot_time
= CURRENT_TIME
;
1322 nfs4_state_start_reclaim_nograce(clp
);
1323 nfs4_schedule_state_recovery(clp
);
1327 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1329 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1330 nfs4_state_start_reclaim_reboot(clp
);
1331 nfs4_schedule_state_recovery(clp
);
1335 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1338 nfs4_reset_all_state(clp
);
1341 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1343 /* This will need to handle layouts too */
1344 nfs_expire_all_delegations(clp
);
1347 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1349 nfs_expire_all_delegations(clp
);
1350 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1351 nfs4_schedule_state_recovery(clp
);
1354 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1358 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1359 nfs41_handle_server_reboot(clp
);
1360 else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1361 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1362 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1363 SEQ4_STATUS_LEASE_MOVED
))
1364 nfs41_handle_state_revoked(clp
);
1365 else if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1366 nfs41_handle_recallable_state_revoked(clp
);
1367 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1368 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1369 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1370 nfs41_handle_cb_path_down(clp
);
1373 static int nfs4_reset_session(struct nfs_client
*clp
)
1377 nfs4_begin_drain_session(clp
);
1378 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1379 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1380 status
!= -NFS4ERR_DEADSESSION
) {
1381 status
= nfs4_recovery_handle_error(clp
, status
);
1385 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1386 status
= nfs4_proc_create_session(clp
);
1388 status
= nfs4_recovery_handle_error(clp
, status
);
1391 /* create_session negotiated new slot table */
1392 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1394 /* Let the state manager reestablish state */
1395 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1396 nfs41_setup_state_renewal(clp
);
1401 static int nfs4_recall_slot(struct nfs_client
*clp
)
1403 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1404 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1405 struct nfs4_slot
*new, *old
;
1408 nfs4_begin_drain_session(clp
);
1409 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1414 spin_lock(&fc_tbl
->slot_tbl_lock
);
1415 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1416 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1417 old
= fc_tbl
->slots
;
1418 fc_tbl
->slots
= new;
1419 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1420 fc_tbl
->target_max_slots
= 0;
1421 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1422 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1425 nfs4_end_drain_session(clp
);
1429 #else /* CONFIG_NFS_V4_1 */
1430 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1431 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1432 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1433 #endif /* CONFIG_NFS_V4_1 */
1435 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1436 * on EXCHANGE_ID for v4.1
1438 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1440 if (nfs4_has_session(clp
)) {
1442 case -NFS4ERR_DELAY
:
1443 case -NFS4ERR_CLID_INUSE
:
1448 nfs4_warn_keyexpired(clp
->cl_hostname
);
1449 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1450 * in nfs4_exchange_id */
1455 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1458 static void nfs4_state_manager(struct nfs_client
*clp
)
1462 /* Ensure exclusive access to NFSv4 state */
1464 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1465 /* We're going to have to re-establish a clientid */
1466 status
= nfs4_reclaim_lease(clp
);
1468 nfs4_set_lease_expired(clp
, status
);
1469 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1472 if (clp
->cl_cons_state
==
1473 NFS_CS_SESSION_INITING
)
1474 nfs_mark_client_ready(clp
, status
);
1477 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1478 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1479 pnfs_destroy_all_layouts(clp
);
1482 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1483 status
= nfs4_check_lease(clp
);
1484 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1486 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1490 /* Initialize or reset the session */
1491 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1492 && nfs4_has_session(clp
)) {
1493 status
= nfs4_reset_session(clp
);
1494 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1500 /* First recover reboot state... */
1501 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1502 status
= nfs4_do_reclaim(clp
,
1503 clp
->cl_mvops
->reboot_recovery_ops
);
1504 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1505 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1507 nfs4_state_end_reclaim_reboot(clp
);
1508 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1514 /* Now recover expired state... */
1515 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1516 status
= nfs4_do_reclaim(clp
,
1517 clp
->cl_mvops
->nograce_recovery_ops
);
1518 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1519 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1520 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1526 nfs4_end_drain_session(clp
);
1527 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1528 nfs_client_return_marked_delegations(clp
);
1531 /* Recall session slots */
1532 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1533 && nfs4_has_session(clp
)) {
1534 status
= nfs4_recall_slot(clp
);
1541 nfs4_clear_state_manager_bit(clp
);
1542 /* Did we race with an attempt to give us more work? */
1543 if (clp
->cl_state
== 0)
1545 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1550 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1551 " with error %d\n", clp
->cl_hostname
, -status
);
1552 nfs4_end_drain_session(clp
);
1553 nfs4_clear_state_manager_bit(clp
);
1556 static int nfs4_run_state_manager(void *ptr
)
1558 struct nfs_client
*clp
= ptr
;
1560 allow_signal(SIGKILL
);
1561 nfs4_state_manager(clp
);
1562 nfs_put_client(clp
);
1563 module_put_and_exit(0);