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 static struct rpc_cred
*
109 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
111 struct rpc_cred
*cred
= NULL
;
112 struct nfs4_state_owner
*sp
;
115 for (pos
= rb_first(&server
->state_owners
);
117 pos
= rb_next(pos
)) {
118 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
119 if (list_empty(&sp
->so_states
))
121 cred
= get_rpccred(sp
->so_cred
);
128 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
129 * @clp: client state handle
131 * Returns an rpc_cred with reference count bumped, or NULL.
132 * Caller must hold clp->cl_lock.
134 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
136 struct rpc_cred
*cred
= NULL
;
137 struct nfs_server
*server
;
140 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
141 cred
= nfs4_get_renew_cred_server_locked(server
);
149 #if defined(CONFIG_NFS_V4_1)
151 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
154 struct nfs_fsinfo fsinfo
;
156 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
158 /* Update lease time and schedule renewal */
159 spin_lock(&clp
->cl_lock
);
160 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
161 clp
->cl_last_renewal
= jiffies
;
162 spin_unlock(&clp
->cl_lock
);
164 nfs4_schedule_state_renewal(clp
);
171 * Back channel returns NFS4ERR_DELAY for new requests when
172 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
175 static void nfs4_end_drain_session(struct nfs_client
*clp
)
177 struct nfs4_session
*ses
= clp
->cl_session
;
182 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
183 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
184 max_slots
= ses
->fc_slot_table
.max_slots
;
185 while (max_slots
--) {
186 struct rpc_task
*task
;
188 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
192 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
194 spin_unlock(&ses
->fc_slot_table
.slot_tbl_lock
);
198 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table
*tbl
)
200 spin_lock(&tbl
->slot_tbl_lock
);
201 if (tbl
->highest_used_slotid
!= -1) {
202 INIT_COMPLETION(tbl
->complete
);
203 spin_unlock(&tbl
->slot_tbl_lock
);
204 return wait_for_completion_interruptible(&tbl
->complete
);
206 spin_unlock(&tbl
->slot_tbl_lock
);
210 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
212 struct nfs4_session
*ses
= clp
->cl_session
;
215 set_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
);
217 ret
= nfs4_wait_on_slot_tbl(&ses
->bc_slot_table
);
221 return nfs4_wait_on_slot_tbl(&ses
->fc_slot_table
);
224 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
228 nfs4_begin_drain_session(clp
);
229 status
= nfs4_proc_exchange_id(clp
, cred
);
232 status
= nfs4_proc_create_session(clp
);
235 nfs41_setup_state_renewal(clp
);
236 nfs_mark_client_ready(clp
, NFS_CS_READY
);
241 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
243 struct rpc_cred
*cred
;
245 spin_lock(&clp
->cl_lock
);
246 cred
= nfs4_get_machine_cred_locked(clp
);
247 spin_unlock(&clp
->cl_lock
);
251 #endif /* CONFIG_NFS_V4_1 */
253 static struct rpc_cred
*
254 nfs4_get_setclientid_cred_server(struct nfs_server
*server
)
256 struct nfs_client
*clp
= server
->nfs_client
;
257 struct rpc_cred
*cred
= NULL
;
258 struct nfs4_state_owner
*sp
;
261 spin_lock(&clp
->cl_lock
);
262 pos
= rb_first(&server
->state_owners
);
264 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
265 cred
= get_rpccred(sp
->so_cred
);
267 spin_unlock(&clp
->cl_lock
);
272 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
273 * @clp: client state handle
275 * Returns an rpc_cred with reference count bumped, or NULL.
277 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
279 struct nfs_server
*server
;
280 struct rpc_cred
*cred
;
282 spin_lock(&clp
->cl_lock
);
283 cred
= nfs4_get_machine_cred_locked(clp
);
284 spin_unlock(&clp
->cl_lock
);
289 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
290 cred
= nfs4_get_setclientid_cred_server(server
);
300 static void nfs_alloc_unique_id_locked(struct rb_root
*root
,
301 struct nfs_unique_id
*new,
302 __u64 minval
, int maxbits
)
304 struct rb_node
**p
, *parent
;
305 struct nfs_unique_id
*pos
;
309 mask
= (1ULL << maxbits
) - 1ULL;
311 /* Ensure distribution is more or less flat */
312 get_random_bytes(&new->id
, sizeof(new->id
));
314 if (new->id
< minval
)
322 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
324 if (new->id
< pos
->id
)
326 else if (new->id
> pos
->id
)
331 rb_link_node(&new->rb_node
, parent
, p
);
332 rb_insert_color(&new->rb_node
, root
);
337 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
341 parent
= rb_next(parent
);
344 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
345 if (new->id
< pos
->id
)
351 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
353 rb_erase(&id
->rb_node
, root
);
356 static struct nfs4_state_owner
*
357 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
359 struct rb_node
**p
= &server
->state_owners
.rb_node
,
361 struct nfs4_state_owner
*sp
, *res
= NULL
;
365 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
367 if (server
< sp
->so_server
) {
368 p
= &parent
->rb_left
;
371 if (server
> sp
->so_server
) {
372 p
= &parent
->rb_right
;
375 if (cred
< sp
->so_cred
)
376 p
= &parent
->rb_left
;
377 else if (cred
> sp
->so_cred
)
378 p
= &parent
->rb_right
;
380 atomic_inc(&sp
->so_count
);
388 static struct nfs4_state_owner
*
389 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
391 struct nfs_server
*server
= new->so_server
;
392 struct rb_node
**p
= &server
->state_owners
.rb_node
,
394 struct nfs4_state_owner
*sp
;
398 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
400 if (new->so_cred
< sp
->so_cred
)
401 p
= &parent
->rb_left
;
402 else if (new->so_cred
> sp
->so_cred
)
403 p
= &parent
->rb_right
;
405 atomic_inc(&sp
->so_count
);
409 nfs_alloc_unique_id_locked(&server
->openowner_id
,
410 &new->so_owner_id
, 1, 64);
411 rb_link_node(&new->so_server_node
, parent
, p
);
412 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
417 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
419 struct nfs_server
*server
= sp
->so_server
;
421 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
422 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
423 nfs_free_unique_id(&server
->openowner_id
, &sp
->so_owner_id
);
427 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
428 * create a new state_owner.
431 static struct nfs4_state_owner
*
432 nfs4_alloc_state_owner(void)
434 struct nfs4_state_owner
*sp
;
436 sp
= kzalloc(sizeof(*sp
),GFP_NOFS
);
439 spin_lock_init(&sp
->so_lock
);
440 INIT_LIST_HEAD(&sp
->so_states
);
441 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
442 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
443 spin_lock_init(&sp
->so_sequence
.lock
);
444 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
445 atomic_set(&sp
->so_count
, 1);
450 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
452 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
453 struct nfs_server
*server
= sp
->so_server
;
454 struct nfs_client
*clp
= server
->nfs_client
;
456 spin_lock(&clp
->cl_lock
);
457 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
458 RB_CLEAR_NODE(&sp
->so_server_node
);
459 spin_unlock(&clp
->cl_lock
);
464 * nfs4_get_state_owner - Look up a state owner given a credential
465 * @server: nfs_server to search
466 * @cred: RPC credential to match
468 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
470 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
471 struct rpc_cred
*cred
)
473 struct nfs_client
*clp
= server
->nfs_client
;
474 struct nfs4_state_owner
*sp
, *new;
476 spin_lock(&clp
->cl_lock
);
477 sp
= nfs4_find_state_owner_locked(server
, cred
);
478 spin_unlock(&clp
->cl_lock
);
481 new = nfs4_alloc_state_owner();
484 new->so_server
= server
;
486 spin_lock(&clp
->cl_lock
);
487 sp
= nfs4_insert_state_owner_locked(new);
488 spin_unlock(&clp
->cl_lock
);
492 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
499 * nfs4_put_state_owner - Release a nfs4_state_owner
500 * @sp: state owner data to release
503 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
505 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
506 struct rpc_cred
*cred
= sp
->so_cred
;
508 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
510 nfs4_remove_state_owner_locked(sp
);
511 spin_unlock(&clp
->cl_lock
);
512 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
517 static struct nfs4_state
*
518 nfs4_alloc_open_state(void)
520 struct nfs4_state
*state
;
522 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
525 atomic_set(&state
->count
, 1);
526 INIT_LIST_HEAD(&state
->lock_states
);
527 spin_lock_init(&state
->state_lock
);
528 seqlock_init(&state
->seqlock
);
533 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
535 if (state
->state
== fmode
)
537 /* NB! List reordering - see the reclaim code for why. */
538 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
539 if (fmode
& FMODE_WRITE
)
540 list_move(&state
->open_states
, &state
->owner
->so_states
);
542 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
544 state
->state
= fmode
;
547 static struct nfs4_state
*
548 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
550 struct nfs_inode
*nfsi
= NFS_I(inode
);
551 struct nfs4_state
*state
;
553 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
554 if (state
->owner
!= owner
)
556 if (atomic_inc_not_zero(&state
->count
))
563 nfs4_free_open_state(struct nfs4_state
*state
)
569 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
571 struct nfs4_state
*state
, *new;
572 struct nfs_inode
*nfsi
= NFS_I(inode
);
574 spin_lock(&inode
->i_lock
);
575 state
= __nfs4_find_state_byowner(inode
, owner
);
576 spin_unlock(&inode
->i_lock
);
579 new = nfs4_alloc_open_state();
580 spin_lock(&owner
->so_lock
);
581 spin_lock(&inode
->i_lock
);
582 state
= __nfs4_find_state_byowner(inode
, owner
);
583 if (state
== NULL
&& new != NULL
) {
585 state
->owner
= owner
;
586 atomic_inc(&owner
->so_count
);
587 list_add(&state
->inode_states
, &nfsi
->open_states
);
588 state
->inode
= igrab(inode
);
589 spin_unlock(&inode
->i_lock
);
590 /* Note: The reclaim code dictates that we add stateless
591 * and read-only stateids to the end of the list */
592 list_add_tail(&state
->open_states
, &owner
->so_states
);
593 spin_unlock(&owner
->so_lock
);
595 spin_unlock(&inode
->i_lock
);
596 spin_unlock(&owner
->so_lock
);
598 nfs4_free_open_state(new);
604 void nfs4_put_open_state(struct nfs4_state
*state
)
606 struct inode
*inode
= state
->inode
;
607 struct nfs4_state_owner
*owner
= state
->owner
;
609 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
611 spin_lock(&inode
->i_lock
);
612 list_del(&state
->inode_states
);
613 list_del(&state
->open_states
);
614 spin_unlock(&inode
->i_lock
);
615 spin_unlock(&owner
->so_lock
);
617 nfs4_free_open_state(state
);
618 nfs4_put_state_owner(owner
);
622 * Close the current file.
624 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
,
625 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
627 struct nfs4_state_owner
*owner
= state
->owner
;
631 atomic_inc(&owner
->so_count
);
632 /* Protect against nfs4_find_state() */
633 spin_lock(&owner
->so_lock
);
634 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
641 case FMODE_READ
|FMODE_WRITE
:
644 newstate
= FMODE_READ
|FMODE_WRITE
;
645 if (state
->n_rdwr
== 0) {
646 if (state
->n_rdonly
== 0) {
647 newstate
&= ~FMODE_READ
;
648 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
649 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
651 if (state
->n_wronly
== 0) {
652 newstate
&= ~FMODE_WRITE
;
653 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
654 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
657 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
659 nfs4_state_set_mode_locked(state
, newstate
);
660 spin_unlock(&owner
->so_lock
);
663 nfs4_put_open_state(state
);
664 nfs4_put_state_owner(owner
);
666 bool roc
= pnfs_roc(state
->inode
);
668 nfs4_do_close(path
, state
, gfp_mask
, wait
, roc
);
672 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
674 __nfs4_close(path
, state
, fmode
, GFP_NOFS
, 0);
677 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
679 __nfs4_close(path
, state
, fmode
, GFP_KERNEL
, 1);
683 * Search the state->lock_states for an existing lock_owner
684 * that is compatible with current->files
686 static struct nfs4_lock_state
*
687 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
689 struct nfs4_lock_state
*pos
;
690 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
691 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
693 switch (pos
->ls_owner
.lo_type
) {
694 case NFS4_POSIX_LOCK_TYPE
:
695 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
698 case NFS4_FLOCK_LOCK_TYPE
:
699 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
702 atomic_inc(&pos
->ls_count
);
709 * Return a compatible lock_state. If no initialized lock_state structure
710 * exists, return an uninitialized one.
713 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
)
715 struct nfs4_lock_state
*lsp
;
716 struct nfs_server
*server
= state
->owner
->so_server
;
717 struct nfs_client
*clp
= server
->nfs_client
;
719 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
722 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
723 spin_lock_init(&lsp
->ls_sequence
.lock
);
724 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
725 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
726 atomic_set(&lsp
->ls_count
, 1);
727 lsp
->ls_state
= state
;
728 lsp
->ls_owner
.lo_type
= type
;
729 switch (lsp
->ls_owner
.lo_type
) {
730 case NFS4_FLOCK_LOCK_TYPE
:
731 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
733 case NFS4_POSIX_LOCK_TYPE
:
734 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
740 spin_lock(&clp
->cl_lock
);
741 nfs_alloc_unique_id_locked(&server
->lockowner_id
, &lsp
->ls_id
, 1, 64);
742 spin_unlock(&clp
->cl_lock
);
743 INIT_LIST_HEAD(&lsp
->ls_locks
);
747 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
749 struct nfs_server
*server
= lsp
->ls_state
->owner
->so_server
;
750 struct nfs_client
*clp
= server
->nfs_client
;
752 spin_lock(&clp
->cl_lock
);
753 nfs_free_unique_id(&server
->lockowner_id
, &lsp
->ls_id
);
754 spin_unlock(&clp
->cl_lock
);
755 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
760 * Return a compatible lock_state. If no initialized lock_state structure
761 * exists, return an uninitialized one.
764 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
766 struct nfs4_lock_state
*lsp
, *new = NULL
;
769 spin_lock(&state
->state_lock
);
770 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
774 list_add(&new->ls_locks
, &state
->lock_states
);
775 set_bit(LK_STATE_IN_USE
, &state
->flags
);
780 spin_unlock(&state
->state_lock
);
781 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
785 spin_unlock(&state
->state_lock
);
787 nfs4_free_lock_state(new);
792 * Release reference to lock_state, and free it if we see that
793 * it is no longer in use
795 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
797 struct nfs4_state
*state
;
801 state
= lsp
->ls_state
;
802 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
804 list_del(&lsp
->ls_locks
);
805 if (list_empty(&state
->lock_states
))
806 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
807 spin_unlock(&state
->state_lock
);
808 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
809 nfs4_release_lockowner(lsp
);
810 nfs4_free_lock_state(lsp
);
813 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
815 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
817 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
818 atomic_inc(&lsp
->ls_count
);
821 static void nfs4_fl_release_lock(struct file_lock
*fl
)
823 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
826 static const struct file_lock_operations nfs4_fl_lock_ops
= {
827 .fl_copy_lock
= nfs4_fl_copy_lock
,
828 .fl_release_private
= nfs4_fl_release_lock
,
831 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
833 struct nfs4_lock_state
*lsp
;
835 if (fl
->fl_ops
!= NULL
)
837 if (fl
->fl_flags
& FL_POSIX
)
838 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
839 else if (fl
->fl_flags
& FL_FLOCK
)
840 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
845 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
846 fl
->fl_ops
= &nfs4_fl_lock_ops
;
851 * Byte-range lock aware utility to initialize the stateid of read/write
854 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
856 struct nfs4_lock_state
*lsp
;
860 seq
= read_seqbegin(&state
->seqlock
);
861 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
862 } while (read_seqretry(&state
->seqlock
, seq
));
863 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
866 spin_lock(&state
->state_lock
);
867 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
868 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
869 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
870 spin_unlock(&state
->state_lock
);
871 nfs4_put_lock_state(lsp
);
874 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
876 struct nfs_seqid
*new;
878 new = kmalloc(sizeof(*new), gfp_mask
);
880 new->sequence
= counter
;
881 INIT_LIST_HEAD(&new->list
);
886 void nfs_release_seqid(struct nfs_seqid
*seqid
)
888 if (!list_empty(&seqid
->list
)) {
889 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
891 spin_lock(&sequence
->lock
);
892 list_del_init(&seqid
->list
);
893 spin_unlock(&sequence
->lock
);
894 rpc_wake_up(&sequence
->wait
);
898 void nfs_free_seqid(struct nfs_seqid
*seqid
)
900 nfs_release_seqid(seqid
);
905 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
906 * failed with a seqid incrementing error -
907 * see comments nfs_fs.h:seqid_mutating_error()
909 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
911 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
915 case -NFS4ERR_BAD_SEQID
:
916 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
918 printk(KERN_WARNING
"NFS: v4 server returned a bad"
919 " sequence-id error on an"
920 " unconfirmed sequence %p!\n",
922 case -NFS4ERR_STALE_CLIENTID
:
923 case -NFS4ERR_STALE_STATEID
:
924 case -NFS4ERR_BAD_STATEID
:
925 case -NFS4ERR_BADXDR
:
926 case -NFS4ERR_RESOURCE
:
927 case -NFS4ERR_NOFILEHANDLE
:
928 /* Non-seqid mutating errors */
932 * Note: no locking needed as we are guaranteed to be first
933 * on the sequence list
935 seqid
->sequence
->counter
++;
938 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
940 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
941 struct nfs4_state_owner
, so_seqid
);
942 struct nfs_server
*server
= sp
->so_server
;
944 if (status
== -NFS4ERR_BAD_SEQID
)
945 nfs4_drop_state_owner(sp
);
946 if (!nfs4_has_session(server
->nfs_client
))
947 nfs_increment_seqid(status
, seqid
);
951 * Increment the seqid if the LOCK/LOCKU succeeded, or
952 * failed with a seqid incrementing error -
953 * see comments nfs_fs.h:seqid_mutating_error()
955 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
957 nfs_increment_seqid(status
, seqid
);
960 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
962 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
965 spin_lock(&sequence
->lock
);
966 if (list_empty(&seqid
->list
))
967 list_add_tail(&seqid
->list
, &sequence
->list
);
968 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
970 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
973 spin_unlock(&sequence
->lock
);
977 static int nfs4_run_state_manager(void *);
979 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
981 smp_mb__before_clear_bit();
982 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
983 smp_mb__after_clear_bit();
984 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
985 rpc_wake_up(&clp
->cl_rpcwaitq
);
989 * Schedule the nfs_client asynchronous state management routine
991 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
993 struct task_struct
*task
;
995 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
997 __module_get(THIS_MODULE
);
998 atomic_inc(&clp
->cl_count
);
999 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
1000 rpc_peeraddr2str(clp
->cl_rpcclient
,
1004 nfs4_clear_state_manager_bit(clp
);
1005 nfs_put_client(clp
);
1006 module_put(THIS_MODULE
);
1010 * Schedule a lease recovery attempt
1012 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1016 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1017 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1018 nfs4_schedule_state_manager(clp
);
1021 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1024 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1025 /* Don't recover state that expired before the reboot */
1026 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1027 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1030 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1031 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1035 static int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1037 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1038 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1039 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1040 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1044 void nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1046 struct nfs_client
*clp
= server
->nfs_client
;
1048 nfs4_state_mark_reclaim_nograce(clp
, state
);
1049 nfs4_schedule_state_manager(clp
);
1052 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1054 struct inode
*inode
= state
->inode
;
1055 struct nfs_inode
*nfsi
= NFS_I(inode
);
1056 struct file_lock
*fl
;
1059 if (inode
->i_flock
== NULL
)
1062 /* Guard against delegation returns and new lock/unlock calls */
1063 down_write(&nfsi
->rwsem
);
1064 /* Protect inode->i_flock using the BKL */
1066 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
1067 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
1069 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1072 status
= ops
->recover_lock(state
, fl
);
1077 case -NFS4ERR_ADMIN_REVOKED
:
1078 case -NFS4ERR_STALE_STATEID
:
1079 case -NFS4ERR_BAD_STATEID
:
1080 case -NFS4ERR_EXPIRED
:
1081 case -NFS4ERR_NO_GRACE
:
1082 case -NFS4ERR_STALE_CLIENTID
:
1083 case -NFS4ERR_BADSESSION
:
1084 case -NFS4ERR_BADSLOT
:
1085 case -NFS4ERR_BAD_HIGH_SLOT
:
1086 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1089 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1092 case -NFS4ERR_DENIED
:
1093 case -NFS4ERR_RECLAIM_BAD
:
1094 case -NFS4ERR_RECLAIM_CONFLICT
:
1095 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1102 up_write(&nfsi
->rwsem
);
1106 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1108 struct nfs4_state
*state
;
1109 struct nfs4_lock_state
*lock
;
1112 /* Note: we rely on the sp->so_states list being ordered
1113 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1115 * This is needed to ensure that the server won't give us any
1116 * read delegations that we have to return if, say, we are
1117 * recovering after a network partition or a reboot from a
1118 * server that doesn't support a grace period.
1121 spin_lock(&sp
->so_lock
);
1122 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1123 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1125 if (state
->state
== 0)
1127 atomic_inc(&state
->count
);
1128 spin_unlock(&sp
->so_lock
);
1129 status
= ops
->recover_open(sp
, state
);
1131 status
= nfs4_reclaim_locks(state
, ops
);
1133 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1134 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1135 printk("%s: Lock reclaim failed!\n",
1138 nfs4_put_open_state(state
);
1144 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1150 * Open state on this file cannot be recovered
1151 * All we can do is revert to using the zero stateid.
1153 memset(state
->stateid
.data
, 0,
1154 sizeof(state
->stateid
.data
));
1155 /* Mark the file as being 'closed' */
1160 * User RPCSEC_GSS context has expired.
1161 * We cannot recover this stateid now, so
1162 * skip it and allow recovery thread to
1166 case -NFS4ERR_ADMIN_REVOKED
:
1167 case -NFS4ERR_STALE_STATEID
:
1168 case -NFS4ERR_BAD_STATEID
:
1169 case -NFS4ERR_RECLAIM_BAD
:
1170 case -NFS4ERR_RECLAIM_CONFLICT
:
1171 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1173 case -NFS4ERR_EXPIRED
:
1174 case -NFS4ERR_NO_GRACE
:
1175 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1176 case -NFS4ERR_STALE_CLIENTID
:
1177 case -NFS4ERR_BADSESSION
:
1178 case -NFS4ERR_BADSLOT
:
1179 case -NFS4ERR_BAD_HIGH_SLOT
:
1180 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1183 nfs4_put_open_state(state
);
1186 spin_unlock(&sp
->so_lock
);
1189 nfs4_put_open_state(state
);
1193 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1195 struct nfs4_lock_state
*lock
;
1197 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1198 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1199 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1200 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1201 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1202 lock
->ls_seqid
.flags
= 0;
1203 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1207 static void nfs4_reset_seqids(struct nfs_server
*server
,
1208 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1210 struct nfs_client
*clp
= server
->nfs_client
;
1211 struct nfs4_state_owner
*sp
;
1212 struct rb_node
*pos
;
1213 struct nfs4_state
*state
;
1215 spin_lock(&clp
->cl_lock
);
1216 for (pos
= rb_first(&server
->state_owners
);
1218 pos
= rb_next(pos
)) {
1219 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1220 sp
->so_seqid
.flags
= 0;
1221 spin_lock(&sp
->so_lock
);
1222 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1223 if (mark_reclaim(clp
, state
))
1224 nfs4_clear_open_state(state
);
1226 spin_unlock(&sp
->so_lock
);
1228 spin_unlock(&clp
->cl_lock
);
1231 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1232 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1234 struct nfs_server
*server
;
1237 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1238 nfs4_reset_seqids(server
, mark_reclaim
);
1242 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1244 /* Mark all delegations for reclaim */
1245 nfs_delegation_mark_reclaim(clp
);
1246 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1249 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1250 const struct nfs4_state_recovery_ops
*ops
)
1252 /* Notify the server we're done reclaiming our state */
1253 if (ops
->reclaim_complete
)
1254 (void)ops
->reclaim_complete(clp
);
1257 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1259 struct nfs_client
*clp
= server
->nfs_client
;
1260 struct nfs4_state_owner
*sp
;
1261 struct rb_node
*pos
;
1262 struct nfs4_state
*state
;
1264 spin_lock(&clp
->cl_lock
);
1265 for (pos
= rb_first(&server
->state_owners
);
1267 pos
= rb_next(pos
)) {
1268 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1269 spin_lock(&sp
->so_lock
);
1270 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1271 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1274 nfs4_state_mark_reclaim_nograce(clp
, state
);
1276 spin_unlock(&sp
->so_lock
);
1278 spin_unlock(&clp
->cl_lock
);
1281 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1283 struct nfs_server
*server
;
1285 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1289 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1290 nfs4_clear_reclaim_server(server
);
1293 nfs_delegation_reap_unclaimed(clp
);
1297 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1299 if (!nfs4_state_clear_reclaim_reboot(clp
))
1301 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1304 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1306 nfs_delegation_mark_reclaim(clp
);
1307 nfs_delegation_reap_unclaimed(clp
);
1310 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1312 nfs_delegation_clear_all(clp
);
1313 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1316 static void nfs4_warn_keyexpired(const char *s
)
1318 printk_ratelimited(KERN_WARNING
"Error: state manager"
1319 " encountered RPCSEC_GSS session"
1320 " expired against NFSv4 server %s.\n",
1324 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1327 case -NFS4ERR_CB_PATH_DOWN
:
1328 nfs_handle_cb_pathdown(clp
);
1330 case -NFS4ERR_NO_GRACE
:
1331 nfs4_state_end_reclaim_reboot(clp
);
1333 case -NFS4ERR_STALE_CLIENTID
:
1334 case -NFS4ERR_LEASE_MOVED
:
1335 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1336 nfs4_state_clear_reclaim_reboot(clp
);
1337 nfs4_state_start_reclaim_reboot(clp
);
1339 case -NFS4ERR_EXPIRED
:
1340 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1341 nfs4_state_start_reclaim_nograce(clp
);
1343 case -NFS4ERR_BADSESSION
:
1344 case -NFS4ERR_BADSLOT
:
1345 case -NFS4ERR_BAD_HIGH_SLOT
:
1346 case -NFS4ERR_DEADSESSION
:
1347 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1348 case -NFS4ERR_SEQ_FALSE_RETRY
:
1349 case -NFS4ERR_SEQ_MISORDERED
:
1350 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1351 /* Zero session reset errors */
1354 /* Nothing we can do */
1355 nfs4_warn_keyexpired(clp
->cl_hostname
);
1361 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1363 struct nfs4_state_owner
*sp
;
1364 struct nfs_server
*server
;
1365 struct rb_node
*pos
;
1370 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1371 spin_lock(&clp
->cl_lock
);
1372 for (pos
= rb_first(&server
->state_owners
);
1374 pos
= rb_next(pos
)) {
1376 struct nfs4_state_owner
, so_server_node
);
1377 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1380 atomic_inc(&sp
->so_count
);
1381 spin_unlock(&clp
->cl_lock
);
1384 status
= nfs4_reclaim_open_state(sp
, ops
);
1386 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1387 nfs4_put_state_owner(sp
);
1388 return nfs4_recovery_handle_error(clp
, status
);
1391 nfs4_put_state_owner(sp
);
1394 spin_unlock(&clp
->cl_lock
);
1400 static int nfs4_check_lease(struct nfs_client
*clp
)
1402 struct rpc_cred
*cred
;
1403 const struct nfs4_state_maintenance_ops
*ops
=
1404 clp
->cl_mvops
->state_renewal_ops
;
1405 int status
= -NFS4ERR_EXPIRED
;
1407 /* Is the client already known to have an expired lease? */
1408 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1410 spin_lock(&clp
->cl_lock
);
1411 cred
= ops
->get_state_renewal_cred_locked(clp
);
1412 spin_unlock(&clp
->cl_lock
);
1414 cred
= nfs4_get_setclientid_cred(clp
);
1418 status
= ops
->renew_lease(clp
, cred
);
1421 return nfs4_recovery_handle_error(clp
, status
);
1424 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1426 struct rpc_cred
*cred
;
1427 const struct nfs4_state_recovery_ops
*ops
=
1428 clp
->cl_mvops
->reboot_recovery_ops
;
1429 int status
= -ENOENT
;
1431 cred
= ops
->get_clid_cred(clp
);
1433 status
= ops
->establish_clid(clp
, cred
);
1435 /* Handle case where the user hasn't set up machine creds */
1436 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1437 nfs4_clear_machine_cred(clp
);
1440 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1441 status
= -EPROTONOSUPPORT
;
1446 #ifdef CONFIG_NFS_V4_1
1447 void nfs4_schedule_session_recovery(struct nfs4_session
*session
)
1449 nfs4_schedule_lease_recovery(session
->clp
);
1452 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1454 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1455 nfs4_schedule_state_manager(clp
);
1458 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1460 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1461 clp
->cl_boot_time
= CURRENT_TIME
;
1462 nfs4_state_start_reclaim_nograce(clp
);
1463 nfs4_schedule_state_manager(clp
);
1467 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1469 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1470 nfs4_state_start_reclaim_reboot(clp
);
1471 nfs4_schedule_state_manager(clp
);
1475 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1478 nfs4_reset_all_state(clp
);
1481 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1483 /* This will need to handle layouts too */
1484 nfs_expire_all_delegations(clp
);
1487 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1489 nfs_expire_all_delegations(clp
);
1490 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1491 nfs4_schedule_state_manager(clp
);
1494 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1498 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1499 nfs41_handle_server_reboot(clp
);
1500 else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1501 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1502 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1503 SEQ4_STATUS_LEASE_MOVED
))
1504 nfs41_handle_state_revoked(clp
);
1505 else if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1506 nfs41_handle_recallable_state_revoked(clp
);
1507 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1508 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1509 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1510 nfs41_handle_cb_path_down(clp
);
1513 static int nfs4_reset_session(struct nfs_client
*clp
)
1517 nfs4_begin_drain_session(clp
);
1518 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1519 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1520 status
!= -NFS4ERR_DEADSESSION
) {
1521 status
= nfs4_recovery_handle_error(clp
, status
);
1525 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1526 status
= nfs4_proc_create_session(clp
);
1528 status
= nfs4_recovery_handle_error(clp
, status
);
1531 /* create_session negotiated new slot table */
1532 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1534 /* Let the state manager reestablish state */
1535 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1536 nfs41_setup_state_renewal(clp
);
1541 static int nfs4_recall_slot(struct nfs_client
*clp
)
1543 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1544 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1545 struct nfs4_slot
*new, *old
;
1548 nfs4_begin_drain_session(clp
);
1549 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1554 spin_lock(&fc_tbl
->slot_tbl_lock
);
1555 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1556 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1557 old
= fc_tbl
->slots
;
1558 fc_tbl
->slots
= new;
1559 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1560 fc_tbl
->target_max_slots
= 0;
1561 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1562 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1565 nfs4_end_drain_session(clp
);
1569 #else /* CONFIG_NFS_V4_1 */
1570 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1571 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1572 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1573 #endif /* CONFIG_NFS_V4_1 */
1575 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1576 * on EXCHANGE_ID for v4.1
1578 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1580 if (nfs4_has_session(clp
)) {
1582 case -NFS4ERR_DELAY
:
1583 case -NFS4ERR_CLID_INUSE
:
1588 nfs4_warn_keyexpired(clp
->cl_hostname
);
1589 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1590 * in nfs4_exchange_id */
1595 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1598 static void nfs4_state_manager(struct nfs_client
*clp
)
1602 /* Ensure exclusive access to NFSv4 state */
1604 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1605 /* We're going to have to re-establish a clientid */
1606 status
= nfs4_reclaim_lease(clp
);
1608 nfs4_set_lease_expired(clp
, status
);
1609 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1612 if (clp
->cl_cons_state
==
1613 NFS_CS_SESSION_INITING
)
1614 nfs_mark_client_ready(clp
, status
);
1617 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1618 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1619 pnfs_destroy_all_layouts(clp
);
1622 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1623 status
= nfs4_check_lease(clp
);
1624 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1626 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1630 /* Initialize or reset the session */
1631 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1632 && nfs4_has_session(clp
)) {
1633 status
= nfs4_reset_session(clp
);
1634 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1640 /* First recover reboot state... */
1641 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1642 status
= nfs4_do_reclaim(clp
,
1643 clp
->cl_mvops
->reboot_recovery_ops
);
1644 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1645 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1647 nfs4_state_end_reclaim_reboot(clp
);
1648 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1654 /* Now recover expired state... */
1655 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1656 status
= nfs4_do_reclaim(clp
,
1657 clp
->cl_mvops
->nograce_recovery_ops
);
1658 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1659 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1660 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1666 nfs4_end_drain_session(clp
);
1667 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1668 nfs_client_return_marked_delegations(clp
);
1671 /* Recall session slots */
1672 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1673 && nfs4_has_session(clp
)) {
1674 status
= nfs4_recall_slot(clp
);
1681 nfs4_clear_state_manager_bit(clp
);
1682 /* Did we race with an attempt to give us more work? */
1683 if (clp
->cl_state
== 0)
1685 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1690 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1691 " with error %d\n", clp
->cl_hostname
, -status
);
1692 nfs4_end_drain_session(clp
);
1693 nfs4_clear_state_manager_bit(clp
);
1696 static int nfs4_run_state_manager(void *ptr
)
1698 struct nfs_client
*clp
= ptr
;
1700 allow_signal(SIGKILL
);
1701 nfs4_state_manager(clp
);
1702 nfs_put_client(clp
);
1703 module_put_and_exit(0);