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>
52 #include <linux/jiffies.h>
56 #include "delegation.h"
60 #define OPENOWNER_POOL_SIZE 8
62 const nfs4_stateid zero_stateid
;
64 static LIST_HEAD(nfs4_clientid_list
);
66 int nfs4_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
68 struct nfs4_setclientid_res clid
= {
69 .clientid
= clp
->cl_clientid
,
70 .confirm
= clp
->cl_confirm
,
75 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
77 port
= nfs_callback_tcpport
;
78 if (clp
->cl_addr
.ss_family
== AF_INET6
)
79 port
= nfs_callback_tcpport6
;
81 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
84 clp
->cl_clientid
= clid
.clientid
;
85 clp
->cl_confirm
= clid
.confirm
;
86 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
88 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
91 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
92 nfs4_schedule_state_renewal(clp
);
97 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
99 struct rpc_cred
*cred
= NULL
;
101 if (clp
->cl_machine_cred
!= NULL
)
102 cred
= get_rpccred(clp
->cl_machine_cred
);
106 static void nfs4_clear_machine_cred(struct nfs_client
*clp
)
108 struct rpc_cred
*cred
;
110 spin_lock(&clp
->cl_lock
);
111 cred
= clp
->cl_machine_cred
;
112 clp
->cl_machine_cred
= NULL
;
113 spin_unlock(&clp
->cl_lock
);
118 static struct rpc_cred
*
119 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
121 struct rpc_cred
*cred
= NULL
;
122 struct nfs4_state_owner
*sp
;
125 for (pos
= rb_first(&server
->state_owners
);
127 pos
= rb_next(pos
)) {
128 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
129 if (list_empty(&sp
->so_states
))
131 cred
= get_rpccred(sp
->so_cred
);
138 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
139 * @clp: client state handle
141 * Returns an rpc_cred with reference count bumped, or NULL.
142 * Caller must hold clp->cl_lock.
144 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
146 struct rpc_cred
*cred
= NULL
;
147 struct nfs_server
*server
;
150 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
151 cred
= nfs4_get_renew_cred_server_locked(server
);
159 #if defined(CONFIG_NFS_V4_1)
161 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
164 struct nfs_fsinfo fsinfo
;
166 if (!test_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
)) {
167 nfs4_schedule_state_renewal(clp
);
171 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
173 /* Update lease time and schedule renewal */
174 spin_lock(&clp
->cl_lock
);
175 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
176 clp
->cl_last_renewal
= jiffies
;
177 spin_unlock(&clp
->cl_lock
);
179 nfs4_schedule_state_renewal(clp
);
186 * Back channel returns NFS4ERR_DELAY for new requests when
187 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
190 static void nfs4_end_drain_session(struct nfs_client
*clp
)
192 struct nfs4_session
*ses
= clp
->cl_session
;
197 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
198 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
199 max_slots
= ses
->fc_slot_table
.max_slots
;
200 while (max_slots
--) {
201 struct rpc_task
*task
;
203 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
207 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
209 spin_unlock(&ses
->fc_slot_table
.slot_tbl_lock
);
213 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table
*tbl
)
215 spin_lock(&tbl
->slot_tbl_lock
);
216 if (tbl
->highest_used_slotid
!= -1) {
217 INIT_COMPLETION(tbl
->complete
);
218 spin_unlock(&tbl
->slot_tbl_lock
);
219 return wait_for_completion_interruptible(&tbl
->complete
);
221 spin_unlock(&tbl
->slot_tbl_lock
);
225 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
227 struct nfs4_session
*ses
= clp
->cl_session
;
230 set_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
);
232 ret
= nfs4_wait_on_slot_tbl(&ses
->bc_slot_table
);
236 return nfs4_wait_on_slot_tbl(&ses
->fc_slot_table
);
239 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
243 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
245 nfs4_begin_drain_session(clp
);
246 status
= nfs4_proc_exchange_id(clp
, cred
);
249 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
251 status
= nfs4_proc_create_session(clp
);
254 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
255 nfs41_setup_state_renewal(clp
);
256 nfs_mark_client_ready(clp
, NFS_CS_READY
);
261 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
263 struct rpc_cred
*cred
;
265 spin_lock(&clp
->cl_lock
);
266 cred
= nfs4_get_machine_cred_locked(clp
);
267 spin_unlock(&clp
->cl_lock
);
271 #endif /* CONFIG_NFS_V4_1 */
273 static struct rpc_cred
*
274 nfs4_get_setclientid_cred_server(struct nfs_server
*server
)
276 struct nfs_client
*clp
= server
->nfs_client
;
277 struct rpc_cred
*cred
= NULL
;
278 struct nfs4_state_owner
*sp
;
281 spin_lock(&clp
->cl_lock
);
282 pos
= rb_first(&server
->state_owners
);
284 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
285 cred
= get_rpccred(sp
->so_cred
);
287 spin_unlock(&clp
->cl_lock
);
292 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
293 * @clp: client state handle
295 * Returns an rpc_cred with reference count bumped, or NULL.
297 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
299 struct nfs_server
*server
;
300 struct rpc_cred
*cred
;
302 spin_lock(&clp
->cl_lock
);
303 cred
= nfs4_get_machine_cred_locked(clp
);
304 spin_unlock(&clp
->cl_lock
);
309 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
310 cred
= nfs4_get_setclientid_cred_server(server
);
320 static void nfs_alloc_unique_id_locked(struct rb_root
*root
,
321 struct nfs_unique_id
*new,
322 __u64 minval
, int maxbits
)
324 struct rb_node
**p
, *parent
;
325 struct nfs_unique_id
*pos
;
329 mask
= (1ULL << maxbits
) - 1ULL;
331 /* Ensure distribution is more or less flat */
332 get_random_bytes(&new->id
, sizeof(new->id
));
334 if (new->id
< minval
)
342 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
344 if (new->id
< pos
->id
)
346 else if (new->id
> pos
->id
)
351 rb_link_node(&new->rb_node
, parent
, p
);
352 rb_insert_color(&new->rb_node
, root
);
357 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
361 parent
= rb_next(parent
);
364 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
365 if (new->id
< pos
->id
)
371 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
373 rb_erase(&id
->rb_node
, root
);
376 static struct nfs4_state_owner
*
377 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
379 struct rb_node
**p
= &server
->state_owners
.rb_node
,
381 struct nfs4_state_owner
*sp
;
385 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
387 if (cred
< sp
->so_cred
)
388 p
= &parent
->rb_left
;
389 else if (cred
> sp
->so_cred
)
390 p
= &parent
->rb_right
;
392 if (!list_empty(&sp
->so_lru
))
393 list_del_init(&sp
->so_lru
);
394 atomic_inc(&sp
->so_count
);
401 static struct nfs4_state_owner
*
402 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
404 struct nfs_server
*server
= new->so_server
;
405 struct rb_node
**p
= &server
->state_owners
.rb_node
,
407 struct nfs4_state_owner
*sp
;
411 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
413 if (new->so_cred
< sp
->so_cred
)
414 p
= &parent
->rb_left
;
415 else if (new->so_cred
> sp
->so_cred
)
416 p
= &parent
->rb_right
;
418 if (!list_empty(&sp
->so_lru
))
419 list_del_init(&sp
->so_lru
);
420 atomic_inc(&sp
->so_count
);
424 nfs_alloc_unique_id_locked(&server
->openowner_id
,
425 &new->so_owner_id
, 1, 64);
426 rb_link_node(&new->so_server_node
, parent
, p
);
427 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
432 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
434 struct nfs_server
*server
= sp
->so_server
;
436 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
437 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
438 nfs_free_unique_id(&server
->openowner_id
, &sp
->so_owner_id
);
442 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
443 * create a new state_owner.
446 static struct nfs4_state_owner
*
447 nfs4_alloc_state_owner(void)
449 struct nfs4_state_owner
*sp
;
451 sp
= kzalloc(sizeof(*sp
),GFP_NOFS
);
454 spin_lock_init(&sp
->so_lock
);
455 INIT_LIST_HEAD(&sp
->so_states
);
456 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
457 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
458 spin_lock_init(&sp
->so_sequence
.lock
);
459 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
460 atomic_set(&sp
->so_count
, 1);
461 INIT_LIST_HEAD(&sp
->so_lru
);
466 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
468 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
469 struct nfs_server
*server
= sp
->so_server
;
470 struct nfs_client
*clp
= server
->nfs_client
;
472 spin_lock(&clp
->cl_lock
);
473 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
474 RB_CLEAR_NODE(&sp
->so_server_node
);
475 spin_unlock(&clp
->cl_lock
);
479 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
481 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
482 put_rpccred(sp
->so_cred
);
486 static void nfs4_gc_state_owners(struct nfs_server
*server
)
488 struct nfs_client
*clp
= server
->nfs_client
;
489 struct nfs4_state_owner
*sp
, *tmp
;
490 unsigned long time_min
, time_max
;
493 spin_lock(&clp
->cl_lock
);
495 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
496 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
497 /* NB: LRU is sorted so that oldest is at the head */
498 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
500 list_move(&sp
->so_lru
, &doomed
);
501 nfs4_remove_state_owner_locked(sp
);
503 spin_unlock(&clp
->cl_lock
);
505 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
506 list_del(&sp
->so_lru
);
507 nfs4_free_state_owner(sp
);
512 * nfs4_get_state_owner - Look up a state owner given a credential
513 * @server: nfs_server to search
514 * @cred: RPC credential to match
516 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
518 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
519 struct rpc_cred
*cred
)
521 struct nfs_client
*clp
= server
->nfs_client
;
522 struct nfs4_state_owner
*sp
, *new;
524 spin_lock(&clp
->cl_lock
);
525 sp
= nfs4_find_state_owner_locked(server
, cred
);
526 spin_unlock(&clp
->cl_lock
);
529 new = nfs4_alloc_state_owner();
532 new->so_server
= server
;
534 spin_lock(&clp
->cl_lock
);
535 sp
= nfs4_insert_state_owner_locked(new);
536 spin_unlock(&clp
->cl_lock
);
540 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
544 nfs4_gc_state_owners(server
);
549 * nfs4_put_state_owner - Release a nfs4_state_owner
550 * @sp: state owner data to release
552 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
554 struct nfs_server
*server
= sp
->so_server
;
555 struct nfs_client
*clp
= server
->nfs_client
;
557 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
560 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
561 sp
->so_expires
= jiffies
;
562 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
563 spin_unlock(&clp
->cl_lock
);
565 nfs4_remove_state_owner_locked(sp
);
566 spin_unlock(&clp
->cl_lock
);
567 nfs4_free_state_owner(sp
);
572 * nfs4_purge_state_owners - Release all cached state owners
573 * @server: nfs_server with cached state owners to release
575 * Called at umount time. Remaining state owners will be on
576 * the LRU with ref count of zero.
578 void nfs4_purge_state_owners(struct nfs_server
*server
)
580 struct nfs_client
*clp
= server
->nfs_client
;
581 struct nfs4_state_owner
*sp
, *tmp
;
584 spin_lock(&clp
->cl_lock
);
585 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
586 list_move(&sp
->so_lru
, &doomed
);
587 nfs4_remove_state_owner_locked(sp
);
589 spin_unlock(&clp
->cl_lock
);
591 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
592 list_del(&sp
->so_lru
);
593 nfs4_free_state_owner(sp
);
597 static struct nfs4_state
*
598 nfs4_alloc_open_state(void)
600 struct nfs4_state
*state
;
602 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
605 atomic_set(&state
->count
, 1);
606 INIT_LIST_HEAD(&state
->lock_states
);
607 spin_lock_init(&state
->state_lock
);
608 seqlock_init(&state
->seqlock
);
613 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
615 if (state
->state
== fmode
)
617 /* NB! List reordering - see the reclaim code for why. */
618 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
619 if (fmode
& FMODE_WRITE
)
620 list_move(&state
->open_states
, &state
->owner
->so_states
);
622 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
624 state
->state
= fmode
;
627 static struct nfs4_state
*
628 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
630 struct nfs_inode
*nfsi
= NFS_I(inode
);
631 struct nfs4_state
*state
;
633 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
634 if (state
->owner
!= owner
)
636 if (atomic_inc_not_zero(&state
->count
))
643 nfs4_free_open_state(struct nfs4_state
*state
)
649 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
651 struct nfs4_state
*state
, *new;
652 struct nfs_inode
*nfsi
= NFS_I(inode
);
654 spin_lock(&inode
->i_lock
);
655 state
= __nfs4_find_state_byowner(inode
, owner
);
656 spin_unlock(&inode
->i_lock
);
659 new = nfs4_alloc_open_state();
660 spin_lock(&owner
->so_lock
);
661 spin_lock(&inode
->i_lock
);
662 state
= __nfs4_find_state_byowner(inode
, owner
);
663 if (state
== NULL
&& new != NULL
) {
665 state
->owner
= owner
;
666 atomic_inc(&owner
->so_count
);
667 list_add(&state
->inode_states
, &nfsi
->open_states
);
669 state
->inode
= inode
;
670 spin_unlock(&inode
->i_lock
);
671 /* Note: The reclaim code dictates that we add stateless
672 * and read-only stateids to the end of the list */
673 list_add_tail(&state
->open_states
, &owner
->so_states
);
674 spin_unlock(&owner
->so_lock
);
676 spin_unlock(&inode
->i_lock
);
677 spin_unlock(&owner
->so_lock
);
679 nfs4_free_open_state(new);
685 void nfs4_put_open_state(struct nfs4_state
*state
)
687 struct inode
*inode
= state
->inode
;
688 struct nfs4_state_owner
*owner
= state
->owner
;
690 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
692 spin_lock(&inode
->i_lock
);
693 list_del(&state
->inode_states
);
694 list_del(&state
->open_states
);
695 spin_unlock(&inode
->i_lock
);
696 spin_unlock(&owner
->so_lock
);
698 nfs4_free_open_state(state
);
699 nfs4_put_state_owner(owner
);
703 * Close the current file.
705 static void __nfs4_close(struct nfs4_state
*state
,
706 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
708 struct nfs4_state_owner
*owner
= state
->owner
;
712 atomic_inc(&owner
->so_count
);
713 /* Protect against nfs4_find_state() */
714 spin_lock(&owner
->so_lock
);
715 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
722 case FMODE_READ
|FMODE_WRITE
:
725 newstate
= FMODE_READ
|FMODE_WRITE
;
726 if (state
->n_rdwr
== 0) {
727 if (state
->n_rdonly
== 0) {
728 newstate
&= ~FMODE_READ
;
729 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
730 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
732 if (state
->n_wronly
== 0) {
733 newstate
&= ~FMODE_WRITE
;
734 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
735 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
738 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
740 nfs4_state_set_mode_locked(state
, newstate
);
741 spin_unlock(&owner
->so_lock
);
744 nfs4_put_open_state(state
);
745 nfs4_put_state_owner(owner
);
747 bool roc
= pnfs_roc(state
->inode
);
749 nfs4_do_close(state
, gfp_mask
, wait
, roc
);
753 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
755 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
758 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
760 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
764 * Search the state->lock_states for an existing lock_owner
765 * that is compatible with current->files
767 static struct nfs4_lock_state
*
768 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
770 struct nfs4_lock_state
*pos
;
771 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
772 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
774 switch (pos
->ls_owner
.lo_type
) {
775 case NFS4_POSIX_LOCK_TYPE
:
776 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
779 case NFS4_FLOCK_LOCK_TYPE
:
780 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
783 atomic_inc(&pos
->ls_count
);
790 * Return a compatible lock_state. If no initialized lock_state structure
791 * exists, return an uninitialized one.
794 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
)
796 struct nfs4_lock_state
*lsp
;
797 struct nfs_server
*server
= state
->owner
->so_server
;
798 struct nfs_client
*clp
= server
->nfs_client
;
800 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
803 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
804 spin_lock_init(&lsp
->ls_sequence
.lock
);
805 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
806 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
807 atomic_set(&lsp
->ls_count
, 1);
808 lsp
->ls_state
= state
;
809 lsp
->ls_owner
.lo_type
= type
;
810 switch (lsp
->ls_owner
.lo_type
) {
811 case NFS4_FLOCK_LOCK_TYPE
:
812 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
814 case NFS4_POSIX_LOCK_TYPE
:
815 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
821 spin_lock(&clp
->cl_lock
);
822 nfs_alloc_unique_id_locked(&server
->lockowner_id
, &lsp
->ls_id
, 1, 64);
823 spin_unlock(&clp
->cl_lock
);
824 INIT_LIST_HEAD(&lsp
->ls_locks
);
828 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
830 struct nfs_server
*server
= lsp
->ls_state
->owner
->so_server
;
831 struct nfs_client
*clp
= server
->nfs_client
;
833 spin_lock(&clp
->cl_lock
);
834 nfs_free_unique_id(&server
->lockowner_id
, &lsp
->ls_id
);
835 spin_unlock(&clp
->cl_lock
);
836 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
841 * Return a compatible lock_state. If no initialized lock_state structure
842 * exists, return an uninitialized one.
845 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
847 struct nfs4_lock_state
*lsp
, *new = NULL
;
850 spin_lock(&state
->state_lock
);
851 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
855 list_add(&new->ls_locks
, &state
->lock_states
);
856 set_bit(LK_STATE_IN_USE
, &state
->flags
);
861 spin_unlock(&state
->state_lock
);
862 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
866 spin_unlock(&state
->state_lock
);
868 nfs4_free_lock_state(new);
873 * Release reference to lock_state, and free it if we see that
874 * it is no longer in use
876 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
878 struct nfs4_state
*state
;
882 state
= lsp
->ls_state
;
883 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
885 list_del(&lsp
->ls_locks
);
886 if (list_empty(&state
->lock_states
))
887 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
888 spin_unlock(&state
->state_lock
);
889 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
890 nfs4_release_lockowner(lsp
);
891 nfs4_free_lock_state(lsp
);
894 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
896 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
898 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
899 atomic_inc(&lsp
->ls_count
);
902 static void nfs4_fl_release_lock(struct file_lock
*fl
)
904 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
907 static const struct file_lock_operations nfs4_fl_lock_ops
= {
908 .fl_copy_lock
= nfs4_fl_copy_lock
,
909 .fl_release_private
= nfs4_fl_release_lock
,
912 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
914 struct nfs4_lock_state
*lsp
;
916 if (fl
->fl_ops
!= NULL
)
918 if (fl
->fl_flags
& FL_POSIX
)
919 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
920 else if (fl
->fl_flags
& FL_FLOCK
)
921 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
926 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
927 fl
->fl_ops
= &nfs4_fl_lock_ops
;
932 * Byte-range lock aware utility to initialize the stateid of read/write
935 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
937 struct nfs4_lock_state
*lsp
;
941 seq
= read_seqbegin(&state
->seqlock
);
942 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
943 } while (read_seqretry(&state
->seqlock
, seq
));
944 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
947 spin_lock(&state
->state_lock
);
948 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
949 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
950 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
951 spin_unlock(&state
->state_lock
);
952 nfs4_put_lock_state(lsp
);
955 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
957 struct nfs_seqid
*new;
959 new = kmalloc(sizeof(*new), gfp_mask
);
961 new->sequence
= counter
;
962 INIT_LIST_HEAD(&new->list
);
967 void nfs_release_seqid(struct nfs_seqid
*seqid
)
969 if (!list_empty(&seqid
->list
)) {
970 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
972 spin_lock(&sequence
->lock
);
973 list_del_init(&seqid
->list
);
974 spin_unlock(&sequence
->lock
);
975 rpc_wake_up(&sequence
->wait
);
979 void nfs_free_seqid(struct nfs_seqid
*seqid
)
981 nfs_release_seqid(seqid
);
986 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
987 * failed with a seqid incrementing error -
988 * see comments nfs_fs.h:seqid_mutating_error()
990 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
992 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
996 case -NFS4ERR_BAD_SEQID
:
997 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
999 printk(KERN_WARNING
"NFS: v4 server returned a bad"
1000 " sequence-id error on an"
1001 " unconfirmed sequence %p!\n",
1003 case -NFS4ERR_STALE_CLIENTID
:
1004 case -NFS4ERR_STALE_STATEID
:
1005 case -NFS4ERR_BAD_STATEID
:
1006 case -NFS4ERR_BADXDR
:
1007 case -NFS4ERR_RESOURCE
:
1008 case -NFS4ERR_NOFILEHANDLE
:
1009 /* Non-seqid mutating errors */
1013 * Note: no locking needed as we are guaranteed to be first
1014 * on the sequence list
1016 seqid
->sequence
->counter
++;
1019 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
1021 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
1022 struct nfs4_state_owner
, so_seqid
);
1023 struct nfs_server
*server
= sp
->so_server
;
1025 if (status
== -NFS4ERR_BAD_SEQID
)
1026 nfs4_drop_state_owner(sp
);
1027 if (!nfs4_has_session(server
->nfs_client
))
1028 nfs_increment_seqid(status
, seqid
);
1032 * Increment the seqid if the LOCK/LOCKU succeeded, or
1033 * failed with a seqid incrementing error -
1034 * see comments nfs_fs.h:seqid_mutating_error()
1036 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
1038 nfs_increment_seqid(status
, seqid
);
1041 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
1043 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
1046 spin_lock(&sequence
->lock
);
1047 if (list_empty(&seqid
->list
))
1048 list_add_tail(&seqid
->list
, &sequence
->list
);
1049 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
1051 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
1054 spin_unlock(&sequence
->lock
);
1058 static int nfs4_run_state_manager(void *);
1060 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1062 smp_mb__before_clear_bit();
1063 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1064 smp_mb__after_clear_bit();
1065 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1066 rpc_wake_up(&clp
->cl_rpcwaitq
);
1070 * Schedule the nfs_client asynchronous state management routine
1072 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1074 struct task_struct
*task
;
1076 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1078 __module_get(THIS_MODULE
);
1079 atomic_inc(&clp
->cl_count
);
1080 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
1081 rpc_peeraddr2str(clp
->cl_rpcclient
,
1085 nfs4_clear_state_manager_bit(clp
);
1086 nfs_put_client(clp
);
1087 module_put(THIS_MODULE
);
1091 * Schedule a lease recovery attempt
1093 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1097 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1098 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1099 nfs4_schedule_state_manager(clp
);
1102 void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
)
1104 nfs_handle_cb_pathdown(clp
);
1105 nfs4_schedule_state_manager(clp
);
1108 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1111 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1112 /* Don't recover state that expired before the reboot */
1113 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1114 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1117 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1118 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1122 static int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1124 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1125 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1126 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1127 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1131 void nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1133 struct nfs_client
*clp
= server
->nfs_client
;
1135 nfs4_state_mark_reclaim_nograce(clp
, state
);
1136 nfs4_schedule_state_manager(clp
);
1139 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1141 struct inode
*inode
= state
->inode
;
1142 struct nfs_inode
*nfsi
= NFS_I(inode
);
1143 struct file_lock
*fl
;
1146 if (inode
->i_flock
== NULL
)
1149 /* Guard against delegation returns and new lock/unlock calls */
1150 down_write(&nfsi
->rwsem
);
1151 /* Protect inode->i_flock using the BKL */
1153 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
1154 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
1156 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1159 status
= ops
->recover_lock(state
, fl
);
1164 case -NFS4ERR_ADMIN_REVOKED
:
1165 case -NFS4ERR_STALE_STATEID
:
1166 case -NFS4ERR_BAD_STATEID
:
1167 case -NFS4ERR_EXPIRED
:
1168 case -NFS4ERR_NO_GRACE
:
1169 case -NFS4ERR_STALE_CLIENTID
:
1170 case -NFS4ERR_BADSESSION
:
1171 case -NFS4ERR_BADSLOT
:
1172 case -NFS4ERR_BAD_HIGH_SLOT
:
1173 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1176 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1179 case -NFS4ERR_DENIED
:
1180 case -NFS4ERR_RECLAIM_BAD
:
1181 case -NFS4ERR_RECLAIM_CONFLICT
:
1182 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1189 up_write(&nfsi
->rwsem
);
1193 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1195 struct nfs4_state
*state
;
1196 struct nfs4_lock_state
*lock
;
1199 /* Note: we rely on the sp->so_states list being ordered
1200 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1202 * This is needed to ensure that the server won't give us any
1203 * read delegations that we have to return if, say, we are
1204 * recovering after a network partition or a reboot from a
1205 * server that doesn't support a grace period.
1208 spin_lock(&sp
->so_lock
);
1209 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1210 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1212 if (state
->state
== 0)
1214 atomic_inc(&state
->count
);
1215 spin_unlock(&sp
->so_lock
);
1216 status
= ops
->recover_open(sp
, state
);
1218 status
= nfs4_reclaim_locks(state
, ops
);
1220 spin_lock(&state
->state_lock
);
1221 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1222 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1223 printk("%s: Lock reclaim failed!\n",
1226 spin_unlock(&state
->state_lock
);
1227 nfs4_put_open_state(state
);
1233 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1239 * Open state on this file cannot be recovered
1240 * All we can do is revert to using the zero stateid.
1242 memset(state
->stateid
.data
, 0,
1243 sizeof(state
->stateid
.data
));
1244 /* Mark the file as being 'closed' */
1249 * User RPCSEC_GSS context has expired.
1250 * We cannot recover this stateid now, so
1251 * skip it and allow recovery thread to
1255 case -NFS4ERR_ADMIN_REVOKED
:
1256 case -NFS4ERR_STALE_STATEID
:
1257 case -NFS4ERR_BAD_STATEID
:
1258 case -NFS4ERR_RECLAIM_BAD
:
1259 case -NFS4ERR_RECLAIM_CONFLICT
:
1260 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1262 case -NFS4ERR_EXPIRED
:
1263 case -NFS4ERR_NO_GRACE
:
1264 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1265 case -NFS4ERR_STALE_CLIENTID
:
1266 case -NFS4ERR_BADSESSION
:
1267 case -NFS4ERR_BADSLOT
:
1268 case -NFS4ERR_BAD_HIGH_SLOT
:
1269 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1272 nfs4_put_open_state(state
);
1275 spin_unlock(&sp
->so_lock
);
1278 nfs4_put_open_state(state
);
1282 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1284 struct nfs4_lock_state
*lock
;
1286 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1287 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1288 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1289 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1290 spin_lock(&state
->state_lock
);
1291 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1292 lock
->ls_seqid
.flags
= 0;
1293 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1295 spin_unlock(&state
->state_lock
);
1298 static void nfs4_reset_seqids(struct nfs_server
*server
,
1299 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1301 struct nfs_client
*clp
= server
->nfs_client
;
1302 struct nfs4_state_owner
*sp
;
1303 struct rb_node
*pos
;
1304 struct nfs4_state
*state
;
1306 spin_lock(&clp
->cl_lock
);
1307 for (pos
= rb_first(&server
->state_owners
);
1309 pos
= rb_next(pos
)) {
1310 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1311 sp
->so_seqid
.flags
= 0;
1312 spin_lock(&sp
->so_lock
);
1313 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1314 if (mark_reclaim(clp
, state
))
1315 nfs4_clear_open_state(state
);
1317 spin_unlock(&sp
->so_lock
);
1319 spin_unlock(&clp
->cl_lock
);
1322 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1323 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1325 struct nfs_server
*server
;
1328 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1329 nfs4_reset_seqids(server
, mark_reclaim
);
1333 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1335 /* Mark all delegations for reclaim */
1336 nfs_delegation_mark_reclaim(clp
);
1337 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1340 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1341 const struct nfs4_state_recovery_ops
*ops
)
1343 /* Notify the server we're done reclaiming our state */
1344 if (ops
->reclaim_complete
)
1345 (void)ops
->reclaim_complete(clp
);
1348 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1350 struct nfs_client
*clp
= server
->nfs_client
;
1351 struct nfs4_state_owner
*sp
;
1352 struct rb_node
*pos
;
1353 struct nfs4_state
*state
;
1355 spin_lock(&clp
->cl_lock
);
1356 for (pos
= rb_first(&server
->state_owners
);
1358 pos
= rb_next(pos
)) {
1359 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1360 spin_lock(&sp
->so_lock
);
1361 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1362 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1365 nfs4_state_mark_reclaim_nograce(clp
, state
);
1367 spin_unlock(&sp
->so_lock
);
1369 spin_unlock(&clp
->cl_lock
);
1372 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1374 struct nfs_server
*server
;
1376 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1380 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1381 nfs4_clear_reclaim_server(server
);
1384 nfs_delegation_reap_unclaimed(clp
);
1388 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1390 if (!nfs4_state_clear_reclaim_reboot(clp
))
1392 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1395 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1397 nfs_delegation_mark_reclaim(clp
);
1398 nfs_delegation_reap_unclaimed(clp
);
1401 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1403 nfs_delegation_clear_all(clp
);
1404 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1407 static void nfs4_warn_keyexpired(const char *s
)
1409 printk_ratelimited(KERN_WARNING
"Error: state manager"
1410 " encountered RPCSEC_GSS session"
1411 " expired against NFSv4 server %s.\n",
1415 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1420 case -NFS4ERR_CB_PATH_DOWN
:
1421 nfs_handle_cb_pathdown(clp
);
1423 case -NFS4ERR_NO_GRACE
:
1424 nfs4_state_end_reclaim_reboot(clp
);
1426 case -NFS4ERR_STALE_CLIENTID
:
1427 case -NFS4ERR_LEASE_MOVED
:
1428 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1429 nfs4_state_clear_reclaim_reboot(clp
);
1430 nfs4_state_start_reclaim_reboot(clp
);
1432 case -NFS4ERR_EXPIRED
:
1433 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1434 nfs4_state_start_reclaim_nograce(clp
);
1436 case -NFS4ERR_BADSESSION
:
1437 case -NFS4ERR_BADSLOT
:
1438 case -NFS4ERR_BAD_HIGH_SLOT
:
1439 case -NFS4ERR_DEADSESSION
:
1440 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1441 case -NFS4ERR_SEQ_FALSE_RETRY
:
1442 case -NFS4ERR_SEQ_MISORDERED
:
1443 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1444 /* Zero session reset errors */
1447 /* Nothing we can do */
1448 nfs4_warn_keyexpired(clp
->cl_hostname
);
1456 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1458 struct nfs4_state_owner
*sp
;
1459 struct nfs_server
*server
;
1460 struct rb_node
*pos
;
1465 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1466 nfs4_purge_state_owners(server
);
1467 spin_lock(&clp
->cl_lock
);
1468 for (pos
= rb_first(&server
->state_owners
);
1470 pos
= rb_next(pos
)) {
1472 struct nfs4_state_owner
, so_server_node
);
1473 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1476 atomic_inc(&sp
->so_count
);
1477 spin_unlock(&clp
->cl_lock
);
1480 status
= nfs4_reclaim_open_state(sp
, ops
);
1482 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1483 nfs4_put_state_owner(sp
);
1484 return nfs4_recovery_handle_error(clp
, status
);
1487 nfs4_put_state_owner(sp
);
1490 spin_unlock(&clp
->cl_lock
);
1496 static int nfs4_check_lease(struct nfs_client
*clp
)
1498 struct rpc_cred
*cred
;
1499 const struct nfs4_state_maintenance_ops
*ops
=
1500 clp
->cl_mvops
->state_renewal_ops
;
1503 /* Is the client already known to have an expired lease? */
1504 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1506 spin_lock(&clp
->cl_lock
);
1507 cred
= ops
->get_state_renewal_cred_locked(clp
);
1508 spin_unlock(&clp
->cl_lock
);
1510 cred
= nfs4_get_setclientid_cred(clp
);
1515 status
= ops
->renew_lease(clp
, cred
);
1518 return nfs4_recovery_handle_error(clp
, status
);
1521 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1523 struct rpc_cred
*cred
;
1524 const struct nfs4_state_recovery_ops
*ops
=
1525 clp
->cl_mvops
->reboot_recovery_ops
;
1526 int status
= -ENOENT
;
1528 cred
= ops
->get_clid_cred(clp
);
1530 status
= ops
->establish_clid(clp
, cred
);
1532 /* Handle case where the user hasn't set up machine creds */
1533 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1534 nfs4_clear_machine_cred(clp
);
1537 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1538 status
= -EPROTONOSUPPORT
;
1543 #ifdef CONFIG_NFS_V4_1
1544 void nfs4_schedule_session_recovery(struct nfs4_session
*session
)
1546 struct nfs_client
*clp
= session
->clp
;
1548 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1549 nfs4_schedule_lease_recovery(clp
);
1551 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
1553 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1555 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1556 nfs4_schedule_state_manager(clp
);
1559 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1561 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1562 clp
->cl_boot_time
= CURRENT_TIME
;
1563 nfs4_state_start_reclaim_nograce(clp
);
1564 nfs4_schedule_state_manager(clp
);
1568 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1570 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1571 nfs4_state_start_reclaim_reboot(clp
);
1572 nfs4_schedule_state_manager(clp
);
1576 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1579 nfs4_reset_all_state(clp
);
1582 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1584 /* This will need to handle layouts too */
1585 nfs_expire_all_delegations(clp
);
1588 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1590 nfs_expire_all_delegations(clp
);
1591 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1592 nfs4_schedule_state_manager(clp
);
1595 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1599 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1600 nfs41_handle_server_reboot(clp
);
1601 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1602 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1603 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1604 SEQ4_STATUS_LEASE_MOVED
))
1605 nfs41_handle_state_revoked(clp
);
1606 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1607 nfs41_handle_recallable_state_revoked(clp
);
1608 if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1609 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1610 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1611 nfs41_handle_cb_path_down(clp
);
1614 static int nfs4_reset_session(struct nfs_client
*clp
)
1618 nfs4_begin_drain_session(clp
);
1619 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1620 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1621 status
!= -NFS4ERR_DEADSESSION
) {
1622 status
= nfs4_recovery_handle_error(clp
, status
);
1626 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1627 status
= nfs4_proc_create_session(clp
);
1629 status
= nfs4_recovery_handle_error(clp
, status
);
1632 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1633 /* create_session negotiated new slot table */
1634 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1636 /* Let the state manager reestablish state */
1637 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1638 nfs41_setup_state_renewal(clp
);
1643 static int nfs4_recall_slot(struct nfs_client
*clp
)
1645 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1646 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1647 struct nfs4_slot
*new, *old
;
1650 nfs4_begin_drain_session(clp
);
1651 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1656 spin_lock(&fc_tbl
->slot_tbl_lock
);
1657 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1658 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1659 old
= fc_tbl
->slots
;
1660 fc_tbl
->slots
= new;
1661 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1662 fc_tbl
->target_max_slots
= 0;
1663 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1664 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1667 nfs4_end_drain_session(clp
);
1671 #else /* CONFIG_NFS_V4_1 */
1672 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1673 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1674 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1675 #endif /* CONFIG_NFS_V4_1 */
1677 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1678 * on EXCHANGE_ID for v4.1
1680 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1683 case -NFS4ERR_CLID_INUSE
:
1684 case -NFS4ERR_STALE_CLIENTID
:
1685 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1687 case -NFS4ERR_DELAY
:
1694 nfs4_warn_keyexpired(clp
->cl_hostname
);
1695 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1696 * in nfs4_exchange_id */
1700 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1703 static void nfs4_state_manager(struct nfs_client
*clp
)
1707 /* Ensure exclusive access to NFSv4 state */
1709 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1710 /* We're going to have to re-establish a clientid */
1711 status
= nfs4_reclaim_lease(clp
);
1713 nfs4_set_lease_expired(clp
, status
);
1714 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1717 if (clp
->cl_cons_state
==
1718 NFS_CS_SESSION_INITING
)
1719 nfs_mark_client_ready(clp
, status
);
1722 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1724 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
,
1726 nfs4_state_start_reclaim_nograce(clp
);
1728 set_bit(NFS4CLNT_RECLAIM_REBOOT
,
1731 pnfs_destroy_all_layouts(clp
);
1734 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1735 status
= nfs4_check_lease(clp
);
1738 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1742 /* Initialize or reset the session */
1743 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1744 && nfs4_has_session(clp
)) {
1745 status
= nfs4_reset_session(clp
);
1746 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1752 /* First recover reboot state... */
1753 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1754 status
= nfs4_do_reclaim(clp
,
1755 clp
->cl_mvops
->reboot_recovery_ops
);
1756 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1757 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1759 nfs4_state_end_reclaim_reboot(clp
);
1760 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1766 /* Now recover expired state... */
1767 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1768 status
= nfs4_do_reclaim(clp
,
1769 clp
->cl_mvops
->nograce_recovery_ops
);
1770 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1771 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1772 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1778 nfs4_end_drain_session(clp
);
1779 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1780 nfs_client_return_marked_delegations(clp
);
1783 /* Recall session slots */
1784 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1785 && nfs4_has_session(clp
)) {
1786 status
= nfs4_recall_slot(clp
);
1793 nfs4_clear_state_manager_bit(clp
);
1794 /* Did we race with an attempt to give us more work? */
1795 if (clp
->cl_state
== 0)
1797 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1799 } while (atomic_read(&clp
->cl_count
) > 1);
1802 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1803 " with error %d\n", clp
->cl_hostname
, -status
);
1804 nfs4_end_drain_session(clp
);
1805 nfs4_clear_state_manager_bit(clp
);
1808 static int nfs4_run_state_manager(void *ptr
)
1810 struct nfs_client
*clp
= ptr
;
1812 allow_signal(SIGKILL
);
1813 nfs4_state_manager(clp
);
1814 nfs_put_client(clp
);
1815 module_put_and_exit(0);