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
;
193 struct nfs4_slot_table
*tbl
;
198 tbl
= &ses
->fc_slot_table
;
199 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
200 spin_lock(&tbl
->slot_tbl_lock
);
201 max_slots
= tbl
->max_slots
;
202 while (max_slots
--) {
203 if (rpc_wake_up_first(&tbl
->slot_tbl_waitq
,
204 nfs4_set_task_privileged
,
208 spin_unlock(&tbl
->slot_tbl_lock
);
212 static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table
*tbl
)
214 spin_lock(&tbl
->slot_tbl_lock
);
215 if (tbl
->highest_used_slotid
!= NFS4_NO_SLOT
) {
216 INIT_COMPLETION(tbl
->complete
);
217 spin_unlock(&tbl
->slot_tbl_lock
);
218 return wait_for_completion_interruptible(&tbl
->complete
);
220 spin_unlock(&tbl
->slot_tbl_lock
);
224 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
226 struct nfs4_session
*ses
= clp
->cl_session
;
229 set_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
);
231 ret
= nfs4_wait_on_slot_tbl(&ses
->bc_slot_table
);
235 return nfs4_wait_on_slot_tbl(&ses
->fc_slot_table
);
238 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
242 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
244 nfs4_begin_drain_session(clp
);
245 status
= nfs4_proc_exchange_id(clp
, cred
);
248 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
250 status
= nfs4_proc_create_session(clp
);
253 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
254 nfs41_setup_state_renewal(clp
);
255 nfs_mark_client_ready(clp
, NFS_CS_READY
);
260 struct rpc_cred
*nfs4_get_exchange_id_cred(struct nfs_client
*clp
)
262 struct rpc_cred
*cred
;
264 spin_lock(&clp
->cl_lock
);
265 cred
= nfs4_get_machine_cred_locked(clp
);
266 spin_unlock(&clp
->cl_lock
);
270 #endif /* CONFIG_NFS_V4_1 */
272 static struct rpc_cred
*
273 nfs4_get_setclientid_cred_server(struct nfs_server
*server
)
275 struct nfs_client
*clp
= server
->nfs_client
;
276 struct rpc_cred
*cred
= NULL
;
277 struct nfs4_state_owner
*sp
;
280 spin_lock(&clp
->cl_lock
);
281 pos
= rb_first(&server
->state_owners
);
283 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
284 cred
= get_rpccred(sp
->so_cred
);
286 spin_unlock(&clp
->cl_lock
);
291 * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation
292 * @clp: client state handle
294 * Returns an rpc_cred with reference count bumped, or NULL.
296 struct rpc_cred
*nfs4_get_setclientid_cred(struct nfs_client
*clp
)
298 struct nfs_server
*server
;
299 struct rpc_cred
*cred
;
301 spin_lock(&clp
->cl_lock
);
302 cred
= nfs4_get_machine_cred_locked(clp
);
303 spin_unlock(&clp
->cl_lock
);
308 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
309 cred
= nfs4_get_setclientid_cred_server(server
);
319 static struct nfs4_state_owner
*
320 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
322 struct rb_node
**p
= &server
->state_owners
.rb_node
,
324 struct nfs4_state_owner
*sp
;
328 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
330 if (cred
< sp
->so_cred
)
331 p
= &parent
->rb_left
;
332 else if (cred
> sp
->so_cred
)
333 p
= &parent
->rb_right
;
335 if (!list_empty(&sp
->so_lru
))
336 list_del_init(&sp
->so_lru
);
337 atomic_inc(&sp
->so_count
);
344 static struct nfs4_state_owner
*
345 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
347 struct nfs_server
*server
= new->so_server
;
348 struct rb_node
**p
= &server
->state_owners
.rb_node
,
350 struct nfs4_state_owner
*sp
;
355 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
357 if (new->so_cred
< sp
->so_cred
)
358 p
= &parent
->rb_left
;
359 else if (new->so_cred
> sp
->so_cred
)
360 p
= &parent
->rb_right
;
362 if (!list_empty(&sp
->so_lru
))
363 list_del_init(&sp
->so_lru
);
364 atomic_inc(&sp
->so_count
);
368 err
= ida_get_new(&server
->openowner_id
, &new->so_seqid
.owner_id
);
371 rb_link_node(&new->so_server_node
, parent
, p
);
372 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
377 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
379 struct nfs_server
*server
= sp
->so_server
;
381 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
382 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
383 ida_remove(&server
->openowner_id
, sp
->so_seqid
.owner_id
);
387 nfs4_init_seqid_counter(struct nfs_seqid_counter
*sc
)
391 spin_lock_init(&sc
->lock
);
392 INIT_LIST_HEAD(&sc
->list
);
393 rpc_init_wait_queue(&sc
->wait
, "Seqid_waitqueue");
397 nfs4_destroy_seqid_counter(struct nfs_seqid_counter
*sc
)
399 rpc_destroy_wait_queue(&sc
->wait
);
403 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
404 * create a new state_owner.
407 static struct nfs4_state_owner
*
408 nfs4_alloc_state_owner(struct nfs_server
*server
,
409 struct rpc_cred
*cred
,
412 struct nfs4_state_owner
*sp
;
414 sp
= kzalloc(sizeof(*sp
), gfp_flags
);
417 sp
->so_server
= server
;
418 sp
->so_cred
= get_rpccred(cred
);
419 spin_lock_init(&sp
->so_lock
);
420 INIT_LIST_HEAD(&sp
->so_states
);
421 nfs4_init_seqid_counter(&sp
->so_seqid
);
422 atomic_set(&sp
->so_count
, 1);
423 INIT_LIST_HEAD(&sp
->so_lru
);
428 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
430 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
431 struct nfs_server
*server
= sp
->so_server
;
432 struct nfs_client
*clp
= server
->nfs_client
;
434 spin_lock(&clp
->cl_lock
);
435 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
436 RB_CLEAR_NODE(&sp
->so_server_node
);
437 spin_unlock(&clp
->cl_lock
);
441 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
443 nfs4_destroy_seqid_counter(&sp
->so_seqid
);
444 put_rpccred(sp
->so_cred
);
448 static void nfs4_gc_state_owners(struct nfs_server
*server
)
450 struct nfs_client
*clp
= server
->nfs_client
;
451 struct nfs4_state_owner
*sp
, *tmp
;
452 unsigned long time_min
, time_max
;
455 spin_lock(&clp
->cl_lock
);
457 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
458 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
459 /* NB: LRU is sorted so that oldest is at the head */
460 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
462 list_move(&sp
->so_lru
, &doomed
);
463 nfs4_remove_state_owner_locked(sp
);
465 spin_unlock(&clp
->cl_lock
);
467 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
468 list_del(&sp
->so_lru
);
469 nfs4_free_state_owner(sp
);
474 * nfs4_get_state_owner - Look up a state owner given a credential
475 * @server: nfs_server to search
476 * @cred: RPC credential to match
478 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
480 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
481 struct rpc_cred
*cred
,
484 struct nfs_client
*clp
= server
->nfs_client
;
485 struct nfs4_state_owner
*sp
, *new;
487 spin_lock(&clp
->cl_lock
);
488 sp
= nfs4_find_state_owner_locked(server
, cred
);
489 spin_unlock(&clp
->cl_lock
);
492 new = nfs4_alloc_state_owner(server
, cred
, gfp_flags
);
496 if (ida_pre_get(&server
->openowner_id
, gfp_flags
) == 0)
498 spin_lock(&clp
->cl_lock
);
499 sp
= nfs4_insert_state_owner_locked(new);
500 spin_unlock(&clp
->cl_lock
);
501 } while (sp
== ERR_PTR(-EAGAIN
));
503 nfs4_free_state_owner(new);
505 nfs4_gc_state_owners(server
);
510 * nfs4_put_state_owner - Release a nfs4_state_owner
511 * @sp: state owner data to release
513 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
515 struct nfs_server
*server
= sp
->so_server
;
516 struct nfs_client
*clp
= server
->nfs_client
;
518 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
521 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
522 sp
->so_expires
= jiffies
;
523 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
524 spin_unlock(&clp
->cl_lock
);
526 nfs4_remove_state_owner_locked(sp
);
527 spin_unlock(&clp
->cl_lock
);
528 nfs4_free_state_owner(sp
);
533 * nfs4_purge_state_owners - Release all cached state owners
534 * @server: nfs_server with cached state owners to release
536 * Called at umount time. Remaining state owners will be on
537 * the LRU with ref count of zero.
539 void nfs4_purge_state_owners(struct nfs_server
*server
)
541 struct nfs_client
*clp
= server
->nfs_client
;
542 struct nfs4_state_owner
*sp
, *tmp
;
545 spin_lock(&clp
->cl_lock
);
546 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
547 list_move(&sp
->so_lru
, &doomed
);
548 nfs4_remove_state_owner_locked(sp
);
550 spin_unlock(&clp
->cl_lock
);
552 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
553 list_del(&sp
->so_lru
);
554 nfs4_free_state_owner(sp
);
558 static struct nfs4_state
*
559 nfs4_alloc_open_state(void)
561 struct nfs4_state
*state
;
563 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
566 atomic_set(&state
->count
, 1);
567 INIT_LIST_HEAD(&state
->lock_states
);
568 spin_lock_init(&state
->state_lock
);
569 seqlock_init(&state
->seqlock
);
574 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
576 if (state
->state
== fmode
)
578 /* NB! List reordering - see the reclaim code for why. */
579 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
580 if (fmode
& FMODE_WRITE
)
581 list_move(&state
->open_states
, &state
->owner
->so_states
);
583 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
585 state
->state
= fmode
;
588 static struct nfs4_state
*
589 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
591 struct nfs_inode
*nfsi
= NFS_I(inode
);
592 struct nfs4_state
*state
;
594 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
595 if (state
->owner
!= owner
)
597 if (atomic_inc_not_zero(&state
->count
))
604 nfs4_free_open_state(struct nfs4_state
*state
)
610 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
612 struct nfs4_state
*state
, *new;
613 struct nfs_inode
*nfsi
= NFS_I(inode
);
615 spin_lock(&inode
->i_lock
);
616 state
= __nfs4_find_state_byowner(inode
, owner
);
617 spin_unlock(&inode
->i_lock
);
620 new = nfs4_alloc_open_state();
621 spin_lock(&owner
->so_lock
);
622 spin_lock(&inode
->i_lock
);
623 state
= __nfs4_find_state_byowner(inode
, owner
);
624 if (state
== NULL
&& new != NULL
) {
626 state
->owner
= owner
;
627 atomic_inc(&owner
->so_count
);
628 list_add(&state
->inode_states
, &nfsi
->open_states
);
630 state
->inode
= inode
;
631 spin_unlock(&inode
->i_lock
);
632 /* Note: The reclaim code dictates that we add stateless
633 * and read-only stateids to the end of the list */
634 list_add_tail(&state
->open_states
, &owner
->so_states
);
635 spin_unlock(&owner
->so_lock
);
637 spin_unlock(&inode
->i_lock
);
638 spin_unlock(&owner
->so_lock
);
640 nfs4_free_open_state(new);
646 void nfs4_put_open_state(struct nfs4_state
*state
)
648 struct inode
*inode
= state
->inode
;
649 struct nfs4_state_owner
*owner
= state
->owner
;
651 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
653 spin_lock(&inode
->i_lock
);
654 list_del(&state
->inode_states
);
655 list_del(&state
->open_states
);
656 spin_unlock(&inode
->i_lock
);
657 spin_unlock(&owner
->so_lock
);
659 nfs4_free_open_state(state
);
660 nfs4_put_state_owner(owner
);
664 * Close the current file.
666 static void __nfs4_close(struct nfs4_state
*state
,
667 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
669 struct nfs4_state_owner
*owner
= state
->owner
;
673 atomic_inc(&owner
->so_count
);
674 /* Protect against nfs4_find_state() */
675 spin_lock(&owner
->so_lock
);
676 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
683 case FMODE_READ
|FMODE_WRITE
:
686 newstate
= FMODE_READ
|FMODE_WRITE
;
687 if (state
->n_rdwr
== 0) {
688 if (state
->n_rdonly
== 0) {
689 newstate
&= ~FMODE_READ
;
690 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
691 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
693 if (state
->n_wronly
== 0) {
694 newstate
&= ~FMODE_WRITE
;
695 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
696 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
699 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
701 nfs4_state_set_mode_locked(state
, newstate
);
702 spin_unlock(&owner
->so_lock
);
705 nfs4_put_open_state(state
);
706 nfs4_put_state_owner(owner
);
708 bool roc
= pnfs_roc(state
->inode
);
710 nfs4_do_close(state
, gfp_mask
, wait
, roc
);
714 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
716 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
719 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
721 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
725 * Search the state->lock_states for an existing lock_owner
726 * that is compatible with current->files
728 static struct nfs4_lock_state
*
729 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
731 struct nfs4_lock_state
*pos
;
732 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
733 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
735 switch (pos
->ls_owner
.lo_type
) {
736 case NFS4_POSIX_LOCK_TYPE
:
737 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
740 case NFS4_FLOCK_LOCK_TYPE
:
741 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
744 atomic_inc(&pos
->ls_count
);
751 * Return a compatible lock_state. If no initialized lock_state structure
752 * exists, return an uninitialized one.
755 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
)
757 struct nfs4_lock_state
*lsp
;
758 struct nfs_server
*server
= state
->owner
->so_server
;
760 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
763 nfs4_init_seqid_counter(&lsp
->ls_seqid
);
764 atomic_set(&lsp
->ls_count
, 1);
765 lsp
->ls_state
= state
;
766 lsp
->ls_owner
.lo_type
= type
;
767 switch (lsp
->ls_owner
.lo_type
) {
768 case NFS4_FLOCK_LOCK_TYPE
:
769 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
771 case NFS4_POSIX_LOCK_TYPE
:
772 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
777 lsp
->ls_seqid
.owner_id
= ida_simple_get(&server
->lockowner_id
, 0, 0, GFP_NOFS
);
778 if (lsp
->ls_seqid
.owner_id
< 0)
780 INIT_LIST_HEAD(&lsp
->ls_locks
);
787 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
789 struct nfs_server
*server
= lsp
->ls_state
->owner
->so_server
;
791 ida_simple_remove(&server
->lockowner_id
, lsp
->ls_seqid
.owner_id
);
792 nfs4_destroy_seqid_counter(&lsp
->ls_seqid
);
797 * Return a compatible lock_state. If no initialized lock_state structure
798 * exists, return an uninitialized one.
801 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
803 struct nfs4_lock_state
*lsp
, *new = NULL
;
806 spin_lock(&state
->state_lock
);
807 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
811 list_add(&new->ls_locks
, &state
->lock_states
);
812 set_bit(LK_STATE_IN_USE
, &state
->flags
);
817 spin_unlock(&state
->state_lock
);
818 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
822 spin_unlock(&state
->state_lock
);
824 nfs4_free_lock_state(new);
829 * Release reference to lock_state, and free it if we see that
830 * it is no longer in use
832 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
834 struct nfs4_state
*state
;
838 state
= lsp
->ls_state
;
839 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
841 list_del(&lsp
->ls_locks
);
842 if (list_empty(&state
->lock_states
))
843 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
844 spin_unlock(&state
->state_lock
);
845 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
846 nfs4_release_lockowner(lsp
);
847 nfs4_free_lock_state(lsp
);
850 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
852 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
854 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
855 atomic_inc(&lsp
->ls_count
);
858 static void nfs4_fl_release_lock(struct file_lock
*fl
)
860 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
863 static const struct file_lock_operations nfs4_fl_lock_ops
= {
864 .fl_copy_lock
= nfs4_fl_copy_lock
,
865 .fl_release_private
= nfs4_fl_release_lock
,
868 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
870 struct nfs4_lock_state
*lsp
;
872 if (fl
->fl_ops
!= NULL
)
874 if (fl
->fl_flags
& FL_POSIX
)
875 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
876 else if (fl
->fl_flags
& FL_FLOCK
)
877 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
882 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
883 fl
->fl_ops
= &nfs4_fl_lock_ops
;
888 * Byte-range lock aware utility to initialize the stateid of read/write
891 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
893 struct nfs4_lock_state
*lsp
;
897 seq
= read_seqbegin(&state
->seqlock
);
898 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
899 } while (read_seqretry(&state
->seqlock
, seq
));
900 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
903 spin_lock(&state
->state_lock
);
904 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
905 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
906 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
907 spin_unlock(&state
->state_lock
);
908 nfs4_put_lock_state(lsp
);
911 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
913 struct nfs_seqid
*new;
915 new = kmalloc(sizeof(*new), gfp_mask
);
917 new->sequence
= counter
;
918 INIT_LIST_HEAD(&new->list
);
924 void nfs_release_seqid(struct nfs_seqid
*seqid
)
926 struct nfs_seqid_counter
*sequence
;
928 if (list_empty(&seqid
->list
))
930 sequence
= seqid
->sequence
;
931 spin_lock(&sequence
->lock
);
932 list_del_init(&seqid
->list
);
933 if (!list_empty(&sequence
->list
)) {
934 struct nfs_seqid
*next
;
936 next
= list_first_entry(&sequence
->list
,
937 struct nfs_seqid
, list
);
938 rpc_wake_up_queued_task(&sequence
->wait
, next
->task
);
940 spin_unlock(&sequence
->lock
);
943 void nfs_free_seqid(struct nfs_seqid
*seqid
)
945 nfs_release_seqid(seqid
);
950 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
951 * failed with a seqid incrementing error -
952 * see comments nfs_fs.h:seqid_mutating_error()
954 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
956 BUG_ON(list_first_entry(&seqid
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
960 case -NFS4ERR_BAD_SEQID
:
961 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
963 printk(KERN_WARNING
"NFS: v4 server returned a bad"
964 " sequence-id error on an"
965 " unconfirmed sequence %p!\n",
967 case -NFS4ERR_STALE_CLIENTID
:
968 case -NFS4ERR_STALE_STATEID
:
969 case -NFS4ERR_BAD_STATEID
:
970 case -NFS4ERR_BADXDR
:
971 case -NFS4ERR_RESOURCE
:
972 case -NFS4ERR_NOFILEHANDLE
:
973 /* Non-seqid mutating errors */
977 * Note: no locking needed as we are guaranteed to be first
978 * on the sequence list
980 seqid
->sequence
->counter
++;
983 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
985 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
986 struct nfs4_state_owner
, so_seqid
);
987 struct nfs_server
*server
= sp
->so_server
;
989 if (status
== -NFS4ERR_BAD_SEQID
)
990 nfs4_drop_state_owner(sp
);
991 if (!nfs4_has_session(server
->nfs_client
))
992 nfs_increment_seqid(status
, seqid
);
996 * Increment the seqid if the LOCK/LOCKU succeeded, or
997 * failed with a seqid incrementing error -
998 * see comments nfs_fs.h:seqid_mutating_error()
1000 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
1002 nfs_increment_seqid(status
, seqid
);
1005 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
1007 struct nfs_seqid_counter
*sequence
= seqid
->sequence
;
1010 spin_lock(&sequence
->lock
);
1012 if (list_empty(&seqid
->list
))
1013 list_add_tail(&seqid
->list
, &sequence
->list
);
1014 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
1016 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
1019 spin_unlock(&sequence
->lock
);
1023 static int nfs4_run_state_manager(void *);
1025 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1027 smp_mb__before_clear_bit();
1028 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1029 smp_mb__after_clear_bit();
1030 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1031 rpc_wake_up(&clp
->cl_rpcwaitq
);
1035 * Schedule the nfs_client asynchronous state management routine
1037 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1039 struct task_struct
*task
;
1040 char buf
[INET6_ADDRSTRLEN
+ sizeof("-manager") + 1];
1042 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1044 __module_get(THIS_MODULE
);
1045 atomic_inc(&clp
->cl_count
);
1047 /* The rcu_read_lock() is not strictly necessary, as the state
1048 * manager is the only thread that ever changes the rpc_xprt
1049 * after it's initialized. At this point, we're single threaded. */
1051 snprintf(buf
, sizeof(buf
), "%s-manager",
1052 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_ADDR
));
1054 task
= kthread_run(nfs4_run_state_manager
, clp
, buf
);
1056 printk(KERN_ERR
"%s: kthread_run: %ld\n",
1057 __func__
, PTR_ERR(task
));
1058 nfs4_clear_state_manager_bit(clp
);
1059 nfs_put_client(clp
);
1060 module_put(THIS_MODULE
);
1065 * Schedule a lease recovery attempt
1067 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1071 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1072 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1073 nfs4_schedule_state_manager(clp
);
1076 void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
)
1078 nfs_handle_cb_pathdown(clp
);
1079 nfs4_schedule_state_manager(clp
);
1082 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1085 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1086 /* Don't recover state that expired before the reboot */
1087 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1088 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1091 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1092 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1096 static int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1098 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1099 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1100 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1101 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1105 void nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1107 struct nfs_client
*clp
= server
->nfs_client
;
1109 nfs4_state_mark_reclaim_nograce(clp
, state
);
1110 nfs4_schedule_state_manager(clp
);
1113 void nfs_inode_find_state_and_recover(struct inode
*inode
,
1114 const nfs4_stateid
*stateid
)
1116 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
1117 struct nfs_inode
*nfsi
= NFS_I(inode
);
1118 struct nfs_open_context
*ctx
;
1119 struct nfs4_state
*state
;
1122 spin_lock(&inode
->i_lock
);
1123 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1127 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
))
1129 if (memcmp(state
->stateid
.data
, stateid
->data
, sizeof(state
->stateid
.data
)) != 0)
1131 nfs4_state_mark_reclaim_nograce(clp
, state
);
1134 spin_unlock(&inode
->i_lock
);
1136 nfs4_schedule_state_manager(clp
);
1140 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1142 struct inode
*inode
= state
->inode
;
1143 struct nfs_inode
*nfsi
= NFS_I(inode
);
1144 struct file_lock
*fl
;
1147 if (inode
->i_flock
== NULL
)
1150 /* Guard against delegation returns and new lock/unlock calls */
1151 down_write(&nfsi
->rwsem
);
1152 /* Protect inode->i_flock using the BKL */
1154 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
1155 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
1157 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1160 status
= ops
->recover_lock(state
, fl
);
1165 case -NFS4ERR_ADMIN_REVOKED
:
1166 case -NFS4ERR_STALE_STATEID
:
1167 case -NFS4ERR_BAD_STATEID
:
1168 case -NFS4ERR_EXPIRED
:
1169 case -NFS4ERR_NO_GRACE
:
1170 case -NFS4ERR_STALE_CLIENTID
:
1171 case -NFS4ERR_BADSESSION
:
1172 case -NFS4ERR_BADSLOT
:
1173 case -NFS4ERR_BAD_HIGH_SLOT
:
1174 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1177 printk(KERN_ERR
"NFS: %s: unhandled error %d. "
1178 "Zeroing state\n", __func__
, status
);
1180 case -NFS4ERR_DENIED
:
1181 case -NFS4ERR_RECLAIM_BAD
:
1182 case -NFS4ERR_RECLAIM_CONFLICT
:
1183 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1190 up_write(&nfsi
->rwsem
);
1194 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1196 struct nfs4_state
*state
;
1197 struct nfs4_lock_state
*lock
;
1200 /* Note: we rely on the sp->so_states list being ordered
1201 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1203 * This is needed to ensure that the server won't give us any
1204 * read delegations that we have to return if, say, we are
1205 * recovering after a network partition or a reboot from a
1206 * server that doesn't support a grace period.
1209 spin_lock(&sp
->so_lock
);
1210 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1211 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1213 if (state
->state
== 0)
1215 atomic_inc(&state
->count
);
1216 spin_unlock(&sp
->so_lock
);
1217 status
= ops
->recover_open(sp
, state
);
1219 status
= nfs4_reclaim_locks(state
, ops
);
1221 spin_lock(&state
->state_lock
);
1222 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1223 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1224 printk("NFS: %s: Lock reclaim "
1225 "failed!\n", __func__
);
1227 spin_unlock(&state
->state_lock
);
1228 nfs4_put_open_state(state
);
1234 printk(KERN_ERR
"NFS: %s: unhandled error %d. "
1235 "Zeroing state\n", __func__
, status
);
1240 * Open state on this file cannot be recovered
1241 * All we can do is revert to using the zero stateid.
1243 memset(state
->stateid
.data
, 0,
1244 sizeof(state
->stateid
.data
));
1245 /* Mark the file as being 'closed' */
1250 * User RPCSEC_GSS context has expired.
1251 * We cannot recover this stateid now, so
1252 * skip it and allow recovery thread to
1256 case -NFS4ERR_ADMIN_REVOKED
:
1257 case -NFS4ERR_STALE_STATEID
:
1258 case -NFS4ERR_BAD_STATEID
:
1259 case -NFS4ERR_RECLAIM_BAD
:
1260 case -NFS4ERR_RECLAIM_CONFLICT
:
1261 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1263 case -NFS4ERR_EXPIRED
:
1264 case -NFS4ERR_NO_GRACE
:
1265 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1266 case -NFS4ERR_STALE_CLIENTID
:
1267 case -NFS4ERR_BADSESSION
:
1268 case -NFS4ERR_BADSLOT
:
1269 case -NFS4ERR_BAD_HIGH_SLOT
:
1270 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1273 nfs4_put_open_state(state
);
1276 spin_unlock(&sp
->so_lock
);
1279 nfs4_put_open_state(state
);
1283 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1285 struct nfs4_lock_state
*lock
;
1287 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1288 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1289 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1290 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1291 spin_lock(&state
->state_lock
);
1292 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1293 lock
->ls_seqid
.flags
= 0;
1294 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1296 spin_unlock(&state
->state_lock
);
1299 static void nfs4_reset_seqids(struct nfs_server
*server
,
1300 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1302 struct nfs_client
*clp
= server
->nfs_client
;
1303 struct nfs4_state_owner
*sp
;
1304 struct rb_node
*pos
;
1305 struct nfs4_state
*state
;
1307 spin_lock(&clp
->cl_lock
);
1308 for (pos
= rb_first(&server
->state_owners
);
1310 pos
= rb_next(pos
)) {
1311 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1312 sp
->so_seqid
.flags
= 0;
1313 spin_lock(&sp
->so_lock
);
1314 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1315 if (mark_reclaim(clp
, state
))
1316 nfs4_clear_open_state(state
);
1318 spin_unlock(&sp
->so_lock
);
1320 spin_unlock(&clp
->cl_lock
);
1323 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1324 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1326 struct nfs_server
*server
;
1329 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1330 nfs4_reset_seqids(server
, mark_reclaim
);
1334 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1336 /* Mark all delegations for reclaim */
1337 nfs_delegation_mark_reclaim(clp
);
1338 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1341 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1342 const struct nfs4_state_recovery_ops
*ops
)
1344 /* Notify the server we're done reclaiming our state */
1345 if (ops
->reclaim_complete
)
1346 (void)ops
->reclaim_complete(clp
);
1349 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1351 struct nfs_client
*clp
= server
->nfs_client
;
1352 struct nfs4_state_owner
*sp
;
1353 struct rb_node
*pos
;
1354 struct nfs4_state
*state
;
1356 spin_lock(&clp
->cl_lock
);
1357 for (pos
= rb_first(&server
->state_owners
);
1359 pos
= rb_next(pos
)) {
1360 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1361 spin_lock(&sp
->so_lock
);
1362 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1363 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1366 nfs4_state_mark_reclaim_nograce(clp
, state
);
1368 spin_unlock(&sp
->so_lock
);
1370 spin_unlock(&clp
->cl_lock
);
1373 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1375 struct nfs_server
*server
;
1377 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1381 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1382 nfs4_clear_reclaim_server(server
);
1385 nfs_delegation_reap_unclaimed(clp
);
1389 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1391 if (!nfs4_state_clear_reclaim_reboot(clp
))
1393 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1396 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1398 nfs_delegation_mark_reclaim(clp
);
1399 nfs_delegation_reap_unclaimed(clp
);
1402 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1404 nfs_delegation_clear_all(clp
);
1405 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1408 static void nfs4_warn_keyexpired(const char *s
)
1410 printk_ratelimited(KERN_WARNING
"Error: state manager"
1411 " encountered RPCSEC_GSS session"
1412 " expired against NFSv4 server %s.\n",
1416 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1421 case -NFS4ERR_CB_PATH_DOWN
:
1422 nfs_handle_cb_pathdown(clp
);
1424 case -NFS4ERR_NO_GRACE
:
1425 nfs4_state_end_reclaim_reboot(clp
);
1427 case -NFS4ERR_STALE_CLIENTID
:
1428 case -NFS4ERR_LEASE_MOVED
:
1429 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1430 nfs4_state_clear_reclaim_reboot(clp
);
1431 nfs4_state_start_reclaim_reboot(clp
);
1433 case -NFS4ERR_EXPIRED
:
1434 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1435 nfs4_state_start_reclaim_nograce(clp
);
1437 case -NFS4ERR_BADSESSION
:
1438 case -NFS4ERR_BADSLOT
:
1439 case -NFS4ERR_BAD_HIGH_SLOT
:
1440 case -NFS4ERR_DEADSESSION
:
1441 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1442 case -NFS4ERR_SEQ_FALSE_RETRY
:
1443 case -NFS4ERR_SEQ_MISORDERED
:
1444 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1445 /* Zero session reset errors */
1448 /* Nothing we can do */
1449 nfs4_warn_keyexpired(clp
->cl_hostname
);
1457 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1459 struct nfs4_state_owner
*sp
;
1460 struct nfs_server
*server
;
1461 struct rb_node
*pos
;
1466 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1467 nfs4_purge_state_owners(server
);
1468 spin_lock(&clp
->cl_lock
);
1469 for (pos
= rb_first(&server
->state_owners
);
1471 pos
= rb_next(pos
)) {
1473 struct nfs4_state_owner
, so_server_node
);
1474 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1477 atomic_inc(&sp
->so_count
);
1478 spin_unlock(&clp
->cl_lock
);
1481 status
= nfs4_reclaim_open_state(sp
, ops
);
1483 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1484 nfs4_put_state_owner(sp
);
1485 return nfs4_recovery_handle_error(clp
, status
);
1488 nfs4_put_state_owner(sp
);
1491 spin_unlock(&clp
->cl_lock
);
1497 static int nfs4_check_lease(struct nfs_client
*clp
)
1499 struct rpc_cred
*cred
;
1500 const struct nfs4_state_maintenance_ops
*ops
=
1501 clp
->cl_mvops
->state_renewal_ops
;
1504 /* Is the client already known to have an expired lease? */
1505 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1507 spin_lock(&clp
->cl_lock
);
1508 cred
= ops
->get_state_renewal_cred_locked(clp
);
1509 spin_unlock(&clp
->cl_lock
);
1511 cred
= nfs4_get_setclientid_cred(clp
);
1516 status
= ops
->renew_lease(clp
, cred
);
1519 return nfs4_recovery_handle_error(clp
, status
);
1522 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1524 struct rpc_cred
*cred
;
1525 const struct nfs4_state_recovery_ops
*ops
=
1526 clp
->cl_mvops
->reboot_recovery_ops
;
1527 int status
= -ENOENT
;
1529 cred
= ops
->get_clid_cred(clp
);
1531 status
= ops
->establish_clid(clp
, cred
);
1533 /* Handle case where the user hasn't set up machine creds */
1534 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1535 nfs4_clear_machine_cred(clp
);
1538 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1539 status
= -EPROTONOSUPPORT
;
1544 #ifdef CONFIG_NFS_V4_1
1545 void nfs4_schedule_session_recovery(struct nfs4_session
*session
)
1547 struct nfs_client
*clp
= session
->clp
;
1549 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1550 nfs4_schedule_lease_recovery(clp
);
1552 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
1554 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1556 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1557 nfs4_schedule_state_manager(clp
);
1560 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1562 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1563 clp
->cl_boot_time
= CURRENT_TIME
;
1564 nfs4_state_start_reclaim_nograce(clp
);
1565 nfs4_schedule_state_manager(clp
);
1569 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1571 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1572 nfs4_state_start_reclaim_reboot(clp
);
1573 nfs4_schedule_state_manager(clp
);
1577 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1580 nfs4_reset_all_state(clp
);
1583 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1585 /* This will need to handle layouts too */
1586 nfs_expire_all_delegations(clp
);
1589 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1591 nfs_expire_all_delegations(clp
);
1592 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1593 nfs4_schedule_state_manager(clp
);
1596 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1600 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1601 nfs41_handle_server_reboot(clp
);
1602 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1603 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1604 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1605 SEQ4_STATUS_LEASE_MOVED
))
1606 nfs41_handle_state_revoked(clp
);
1607 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1608 nfs41_handle_recallable_state_revoked(clp
);
1609 if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1610 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1611 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1612 nfs41_handle_cb_path_down(clp
);
1615 static int nfs4_reset_session(struct nfs_client
*clp
)
1619 nfs4_begin_drain_session(clp
);
1620 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1621 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1622 status
!= -NFS4ERR_DEADSESSION
) {
1623 status
= nfs4_recovery_handle_error(clp
, status
);
1627 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1628 status
= nfs4_proc_create_session(clp
);
1630 status
= nfs4_recovery_handle_error(clp
, status
);
1633 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1634 /* create_session negotiated new slot table */
1635 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1637 /* Let the state manager reestablish state */
1638 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1639 nfs41_setup_state_renewal(clp
);
1644 static int nfs4_recall_slot(struct nfs_client
*clp
)
1646 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1647 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1648 struct nfs4_slot
*new, *old
;
1651 nfs4_begin_drain_session(clp
);
1652 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1657 spin_lock(&fc_tbl
->slot_tbl_lock
);
1658 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1659 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1660 old
= fc_tbl
->slots
;
1661 fc_tbl
->slots
= new;
1662 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1663 fc_tbl
->target_max_slots
= 0;
1664 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1665 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1668 nfs4_end_drain_session(clp
);
1672 #else /* CONFIG_NFS_V4_1 */
1673 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1674 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1675 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1676 #endif /* CONFIG_NFS_V4_1 */
1678 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1679 * on EXCHANGE_ID for v4.1
1681 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1684 case -NFS4ERR_CLID_INUSE
:
1685 case -NFS4ERR_STALE_CLIENTID
:
1686 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1688 case -NFS4ERR_DELAY
:
1695 nfs4_warn_keyexpired(clp
->cl_hostname
);
1696 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1697 * in nfs4_exchange_id */
1701 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1704 static void nfs4_state_manager(struct nfs_client
*clp
)
1708 /* Ensure exclusive access to NFSv4 state */
1710 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1711 /* We're going to have to re-establish a clientid */
1712 status
= nfs4_reclaim_lease(clp
);
1714 nfs4_set_lease_expired(clp
, status
);
1715 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1718 if (clp
->cl_cons_state
==
1719 NFS_CS_SESSION_INITING
)
1720 nfs_mark_client_ready(clp
, status
);
1723 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1725 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
,
1727 nfs4_state_start_reclaim_nograce(clp
);
1729 set_bit(NFS4CLNT_RECLAIM_REBOOT
,
1732 pnfs_destroy_all_layouts(clp
);
1735 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1736 status
= nfs4_check_lease(clp
);
1739 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1743 /* Initialize or reset the session */
1744 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1745 && nfs4_has_session(clp
)) {
1746 status
= nfs4_reset_session(clp
);
1747 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1753 /* First recover reboot state... */
1754 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1755 status
= nfs4_do_reclaim(clp
,
1756 clp
->cl_mvops
->reboot_recovery_ops
);
1757 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1758 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1760 nfs4_state_end_reclaim_reboot(clp
);
1761 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1767 /* Now recover expired state... */
1768 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1769 status
= nfs4_do_reclaim(clp
,
1770 clp
->cl_mvops
->nograce_recovery_ops
);
1771 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1772 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1773 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1779 nfs4_end_drain_session(clp
);
1780 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1781 nfs_client_return_marked_delegations(clp
);
1784 /* Recall session slots */
1785 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1786 && nfs4_has_session(clp
)) {
1787 status
= nfs4_recall_slot(clp
);
1794 nfs4_clear_state_manager_bit(clp
);
1795 /* Did we race with an attempt to give us more work? */
1796 if (clp
->cl_state
== 0)
1798 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1800 } while (atomic_read(&clp
->cl_count
) > 1);
1803 printk(KERN_WARNING
"NFS: state manager failed on NFSv4 server %s"
1804 " with error %d\n", clp
->cl_hostname
, -status
);
1805 nfs4_end_drain_session(clp
);
1806 nfs4_clear_state_manager_bit(clp
);
1809 static int nfs4_run_state_manager(void *ptr
)
1811 struct nfs_client
*clp
= ptr
;
1813 allow_signal(SIGKILL
);
1814 nfs4_state_manager(clp
);
1815 nfs_put_client(clp
);
1816 module_put_and_exit(0);