4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/kthread.h>
47 #include <linux/module.h>
48 #include <linux/random.h>
49 #include <linux/ratelimit.h>
50 #include <linux/workqueue.h>
51 #include <linux/bitops.h>
55 #include "delegation.h"
59 #define OPENOWNER_POOL_SIZE 8
61 const nfs4_stateid zero_stateid
;
63 static LIST_HEAD(nfs4_clientid_list
);
65 int nfs4_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
67 struct nfs4_setclientid_res clid
= {
68 .clientid
= clp
->cl_clientid
,
69 .confirm
= clp
->cl_confirm
,
74 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
76 port
= nfs_callback_tcpport
;
77 if (clp
->cl_addr
.ss_family
== AF_INET6
)
78 port
= nfs_callback_tcpport6
;
80 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
83 clp
->cl_clientid
= clid
.clientid
;
84 clp
->cl_confirm
= clid
.confirm
;
85 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
87 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
90 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
91 nfs4_schedule_state_renewal(clp
);
96 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
98 struct rpc_cred
*cred
= NULL
;
100 if (clp
->cl_machine_cred
!= NULL
)
101 cred
= get_rpccred(clp
->cl_machine_cred
);
105 static void nfs4_clear_machine_cred(struct nfs_client
*clp
)
107 struct rpc_cred
*cred
;
109 spin_lock(&clp
->cl_lock
);
110 cred
= clp
->cl_machine_cred
;
111 clp
->cl_machine_cred
= NULL
;
112 spin_unlock(&clp
->cl_lock
);
117 static struct rpc_cred
*
118 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
120 struct rpc_cred
*cred
= NULL
;
121 struct nfs4_state_owner
*sp
;
124 for (pos
= rb_first(&server
->state_owners
);
126 pos
= rb_next(pos
)) {
127 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
128 if (list_empty(&sp
->so_states
))
130 cred
= get_rpccred(sp
->so_cred
);
137 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
138 * @clp: client state handle
140 * Returns an rpc_cred with reference count bumped, or NULL.
141 * Caller must hold clp->cl_lock.
143 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
145 struct rpc_cred
*cred
= NULL
;
146 struct nfs_server
*server
;
149 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
150 cred
= nfs4_get_renew_cred_server_locked(server
);
158 #if defined(CONFIG_NFS_V4_1)
160 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
163 struct nfs_fsinfo fsinfo
;
165 if (!test_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
)) {
166 nfs4_schedule_state_renewal(clp
);
170 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
172 /* Update lease time and schedule renewal */
173 spin_lock(&clp
->cl_lock
);
174 clp
->cl_lease_time
= fsinfo
.lease_time
* HZ
;
175 clp
->cl_last_renewal
= jiffies
;
176 spin_unlock(&clp
->cl_lock
);
178 nfs4_schedule_state_renewal(clp
);
185 * Back channel returns NFS4ERR_DELAY for new requests when
186 * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
189 static void nfs4_end_drain_session(struct nfs_client
*clp
)
191 struct nfs4_session
*ses
= clp
->cl_session
;
196 if (test_and_clear_bit(NFS4_SESSION_DRAINING
, &ses
->session_state
)) {
197 spin_lock(&ses
->fc_slot_table
.slot_tbl_lock
);
198 max_slots
= ses
->fc_slot_table
.max_slots
;
199 while (max_slots
--) {
200 struct rpc_task
*task
;
202 task
= rpc_wake_up_next(&ses
->fc_slot_table
.
206 rpc_task_set_priority(task
, RPC_PRIORITY_PRIVILEGED
);
208 spin_unlock(&ses
->fc_slot_table
.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
!= -1) {
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 void nfs_alloc_unique_id_locked(struct rb_root
*root
,
320 struct nfs_unique_id
*new,
321 __u64 minval
, int maxbits
)
323 struct rb_node
**p
, *parent
;
324 struct nfs_unique_id
*pos
;
328 mask
= (1ULL << maxbits
) - 1ULL;
330 /* Ensure distribution is more or less flat */
331 get_random_bytes(&new->id
, sizeof(new->id
));
333 if (new->id
< minval
)
341 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
343 if (new->id
< pos
->id
)
345 else if (new->id
> pos
->id
)
350 rb_link_node(&new->rb_node
, parent
, p
);
351 rb_insert_color(&new->rb_node
, root
);
356 if (new->id
< minval
|| (new->id
& mask
) != new->id
) {
360 parent
= rb_next(parent
);
363 pos
= rb_entry(parent
, struct nfs_unique_id
, rb_node
);
364 if (new->id
< pos
->id
)
370 static void nfs_free_unique_id(struct rb_root
*root
, struct nfs_unique_id
*id
)
372 rb_erase(&id
->rb_node
, root
);
375 static struct nfs4_state_owner
*
376 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
378 struct rb_node
**p
= &server
->state_owners
.rb_node
,
380 struct nfs4_state_owner
*sp
, *res
= NULL
;
384 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
386 if (server
< sp
->so_server
) {
387 p
= &parent
->rb_left
;
390 if (server
> sp
->so_server
) {
391 p
= &parent
->rb_right
;
394 if (cred
< sp
->so_cred
)
395 p
= &parent
->rb_left
;
396 else if (cred
> sp
->so_cred
)
397 p
= &parent
->rb_right
;
399 atomic_inc(&sp
->so_count
);
407 static struct nfs4_state_owner
*
408 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
410 struct nfs_server
*server
= new->so_server
;
411 struct rb_node
**p
= &server
->state_owners
.rb_node
,
413 struct nfs4_state_owner
*sp
;
417 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
419 if (new->so_cred
< sp
->so_cred
)
420 p
= &parent
->rb_left
;
421 else if (new->so_cred
> sp
->so_cred
)
422 p
= &parent
->rb_right
;
424 atomic_inc(&sp
->so_count
);
428 nfs_alloc_unique_id_locked(&server
->openowner_id
,
429 &new->so_owner_id
, 1, 64);
430 rb_link_node(&new->so_server_node
, parent
, p
);
431 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
436 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
438 struct nfs_server
*server
= sp
->so_server
;
440 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
441 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
442 nfs_free_unique_id(&server
->openowner_id
, &sp
->so_owner_id
);
446 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
447 * create a new state_owner.
450 static struct nfs4_state_owner
*
451 nfs4_alloc_state_owner(void)
453 struct nfs4_state_owner
*sp
;
455 sp
= kzalloc(sizeof(*sp
),GFP_NOFS
);
458 spin_lock_init(&sp
->so_lock
);
459 INIT_LIST_HEAD(&sp
->so_states
);
460 rpc_init_wait_queue(&sp
->so_sequence
.wait
, "Seqid_waitqueue");
461 sp
->so_seqid
.sequence
= &sp
->so_sequence
;
462 spin_lock_init(&sp
->so_sequence
.lock
);
463 INIT_LIST_HEAD(&sp
->so_sequence
.list
);
464 atomic_set(&sp
->so_count
, 1);
469 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
471 if (!RB_EMPTY_NODE(&sp
->so_server_node
)) {
472 struct nfs_server
*server
= sp
->so_server
;
473 struct nfs_client
*clp
= server
->nfs_client
;
475 spin_lock(&clp
->cl_lock
);
476 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
477 RB_CLEAR_NODE(&sp
->so_server_node
);
478 spin_unlock(&clp
->cl_lock
);
483 * nfs4_get_state_owner - Look up a state owner given a credential
484 * @server: nfs_server to search
485 * @cred: RPC credential to match
487 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
489 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
490 struct rpc_cred
*cred
)
492 struct nfs_client
*clp
= server
->nfs_client
;
493 struct nfs4_state_owner
*sp
, *new;
495 spin_lock(&clp
->cl_lock
);
496 sp
= nfs4_find_state_owner_locked(server
, cred
);
497 spin_unlock(&clp
->cl_lock
);
500 new = nfs4_alloc_state_owner();
503 new->so_server
= server
;
505 spin_lock(&clp
->cl_lock
);
506 sp
= nfs4_insert_state_owner_locked(new);
507 spin_unlock(&clp
->cl_lock
);
511 rpc_destroy_wait_queue(&new->so_sequence
.wait
);
518 * nfs4_put_state_owner - Release a nfs4_state_owner
519 * @sp: state owner data to release
522 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
524 struct nfs_client
*clp
= sp
->so_server
->nfs_client
;
525 struct rpc_cred
*cred
= sp
->so_cred
;
527 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
529 nfs4_remove_state_owner_locked(sp
);
530 spin_unlock(&clp
->cl_lock
);
531 rpc_destroy_wait_queue(&sp
->so_sequence
.wait
);
536 static struct nfs4_state
*
537 nfs4_alloc_open_state(void)
539 struct nfs4_state
*state
;
541 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
544 atomic_set(&state
->count
, 1);
545 INIT_LIST_HEAD(&state
->lock_states
);
546 spin_lock_init(&state
->state_lock
);
547 seqlock_init(&state
->seqlock
);
552 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
554 if (state
->state
== fmode
)
556 /* NB! List reordering - see the reclaim code for why. */
557 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
558 if (fmode
& FMODE_WRITE
)
559 list_move(&state
->open_states
, &state
->owner
->so_states
);
561 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
563 state
->state
= fmode
;
566 static struct nfs4_state
*
567 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
569 struct nfs_inode
*nfsi
= NFS_I(inode
);
570 struct nfs4_state
*state
;
572 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
573 if (state
->owner
!= owner
)
575 if (atomic_inc_not_zero(&state
->count
))
582 nfs4_free_open_state(struct nfs4_state
*state
)
588 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
590 struct nfs4_state
*state
, *new;
591 struct nfs_inode
*nfsi
= NFS_I(inode
);
593 spin_lock(&inode
->i_lock
);
594 state
= __nfs4_find_state_byowner(inode
, owner
);
595 spin_unlock(&inode
->i_lock
);
598 new = nfs4_alloc_open_state();
599 spin_lock(&owner
->so_lock
);
600 spin_lock(&inode
->i_lock
);
601 state
= __nfs4_find_state_byowner(inode
, owner
);
602 if (state
== NULL
&& new != NULL
) {
604 state
->owner
= owner
;
605 atomic_inc(&owner
->so_count
);
606 list_add(&state
->inode_states
, &nfsi
->open_states
);
608 state
->inode
= inode
;
609 spin_unlock(&inode
->i_lock
);
610 /* Note: The reclaim code dictates that we add stateless
611 * and read-only stateids to the end of the list */
612 list_add_tail(&state
->open_states
, &owner
->so_states
);
613 spin_unlock(&owner
->so_lock
);
615 spin_unlock(&inode
->i_lock
);
616 spin_unlock(&owner
->so_lock
);
618 nfs4_free_open_state(new);
624 void nfs4_put_open_state(struct nfs4_state
*state
)
626 struct inode
*inode
= state
->inode
;
627 struct nfs4_state_owner
*owner
= state
->owner
;
629 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
631 spin_lock(&inode
->i_lock
);
632 list_del(&state
->inode_states
);
633 list_del(&state
->open_states
);
634 spin_unlock(&inode
->i_lock
);
635 spin_unlock(&owner
->so_lock
);
637 nfs4_free_open_state(state
);
638 nfs4_put_state_owner(owner
);
642 * Close the current file.
644 static void __nfs4_close(struct path
*path
, struct nfs4_state
*state
,
645 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
647 struct nfs4_state_owner
*owner
= state
->owner
;
651 atomic_inc(&owner
->so_count
);
652 /* Protect against nfs4_find_state() */
653 spin_lock(&owner
->so_lock
);
654 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
661 case FMODE_READ
|FMODE_WRITE
:
664 newstate
= FMODE_READ
|FMODE_WRITE
;
665 if (state
->n_rdwr
== 0) {
666 if (state
->n_rdonly
== 0) {
667 newstate
&= ~FMODE_READ
;
668 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
669 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
671 if (state
->n_wronly
== 0) {
672 newstate
&= ~FMODE_WRITE
;
673 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
674 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
677 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
679 nfs4_state_set_mode_locked(state
, newstate
);
680 spin_unlock(&owner
->so_lock
);
683 nfs4_put_open_state(state
);
684 nfs4_put_state_owner(owner
);
686 bool roc
= pnfs_roc(state
->inode
);
688 nfs4_do_close(path
, state
, gfp_mask
, wait
, roc
);
692 void nfs4_close_state(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
694 __nfs4_close(path
, state
, fmode
, GFP_NOFS
, 0);
697 void nfs4_close_sync(struct path
*path
, struct nfs4_state
*state
, fmode_t fmode
)
699 __nfs4_close(path
, state
, fmode
, GFP_KERNEL
, 1);
703 * Search the state->lock_states for an existing lock_owner
704 * that is compatible with current->files
706 static struct nfs4_lock_state
*
707 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
, unsigned int type
)
709 struct nfs4_lock_state
*pos
;
710 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
711 if (type
!= NFS4_ANY_LOCK_TYPE
&& pos
->ls_owner
.lo_type
!= type
)
713 switch (pos
->ls_owner
.lo_type
) {
714 case NFS4_POSIX_LOCK_TYPE
:
715 if (pos
->ls_owner
.lo_u
.posix_owner
!= fl_owner
)
718 case NFS4_FLOCK_LOCK_TYPE
:
719 if (pos
->ls_owner
.lo_u
.flock_owner
!= fl_pid
)
722 atomic_inc(&pos
->ls_count
);
729 * Return a compatible lock_state. If no initialized lock_state structure
730 * exists, return an uninitialized one.
733 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
)
735 struct nfs4_lock_state
*lsp
;
736 struct nfs_server
*server
= state
->owner
->so_server
;
737 struct nfs_client
*clp
= server
->nfs_client
;
739 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
742 rpc_init_wait_queue(&lsp
->ls_sequence
.wait
, "lock_seqid_waitqueue");
743 spin_lock_init(&lsp
->ls_sequence
.lock
);
744 INIT_LIST_HEAD(&lsp
->ls_sequence
.list
);
745 lsp
->ls_seqid
.sequence
= &lsp
->ls_sequence
;
746 atomic_set(&lsp
->ls_count
, 1);
747 lsp
->ls_state
= state
;
748 lsp
->ls_owner
.lo_type
= type
;
749 switch (lsp
->ls_owner
.lo_type
) {
750 case NFS4_FLOCK_LOCK_TYPE
:
751 lsp
->ls_owner
.lo_u
.flock_owner
= fl_pid
;
753 case NFS4_POSIX_LOCK_TYPE
:
754 lsp
->ls_owner
.lo_u
.posix_owner
= fl_owner
;
760 spin_lock(&clp
->cl_lock
);
761 nfs_alloc_unique_id_locked(&server
->lockowner_id
, &lsp
->ls_id
, 1, 64);
762 spin_unlock(&clp
->cl_lock
);
763 INIT_LIST_HEAD(&lsp
->ls_locks
);
767 static void nfs4_free_lock_state(struct nfs4_lock_state
*lsp
)
769 struct nfs_server
*server
= lsp
->ls_state
->owner
->so_server
;
770 struct nfs_client
*clp
= server
->nfs_client
;
772 spin_lock(&clp
->cl_lock
);
773 nfs_free_unique_id(&server
->lockowner_id
, &lsp
->ls_id
);
774 spin_unlock(&clp
->cl_lock
);
775 rpc_destroy_wait_queue(&lsp
->ls_sequence
.wait
);
780 * Return a compatible lock_state. If no initialized lock_state structure
781 * exists, return an uninitialized one.
784 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
, pid_t pid
, unsigned int type
)
786 struct nfs4_lock_state
*lsp
, *new = NULL
;
789 spin_lock(&state
->state_lock
);
790 lsp
= __nfs4_find_lock_state(state
, owner
, pid
, type
);
794 list_add(&new->ls_locks
, &state
->lock_states
);
795 set_bit(LK_STATE_IN_USE
, &state
->flags
);
800 spin_unlock(&state
->state_lock
);
801 new = nfs4_alloc_lock_state(state
, owner
, pid
, type
);
805 spin_unlock(&state
->state_lock
);
807 nfs4_free_lock_state(new);
812 * Release reference to lock_state, and free it if we see that
813 * it is no longer in use
815 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
817 struct nfs4_state
*state
;
821 state
= lsp
->ls_state
;
822 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
824 list_del(&lsp
->ls_locks
);
825 if (list_empty(&state
->lock_states
))
826 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
827 spin_unlock(&state
->state_lock
);
828 if (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
)
829 nfs4_release_lockowner(lsp
);
830 nfs4_free_lock_state(lsp
);
833 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
835 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
837 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
838 atomic_inc(&lsp
->ls_count
);
841 static void nfs4_fl_release_lock(struct file_lock
*fl
)
843 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
846 static const struct file_lock_operations nfs4_fl_lock_ops
= {
847 .fl_copy_lock
= nfs4_fl_copy_lock
,
848 .fl_release_private
= nfs4_fl_release_lock
,
851 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
853 struct nfs4_lock_state
*lsp
;
855 if (fl
->fl_ops
!= NULL
)
857 if (fl
->fl_flags
& FL_POSIX
)
858 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
, 0, NFS4_POSIX_LOCK_TYPE
);
859 else if (fl
->fl_flags
& FL_FLOCK
)
860 lsp
= nfs4_get_lock_state(state
, 0, fl
->fl_pid
, NFS4_FLOCK_LOCK_TYPE
);
865 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
866 fl
->fl_ops
= &nfs4_fl_lock_ops
;
871 * Byte-range lock aware utility to initialize the stateid of read/write
874 void nfs4_copy_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
, fl_owner_t fl_owner
, pid_t fl_pid
)
876 struct nfs4_lock_state
*lsp
;
880 seq
= read_seqbegin(&state
->seqlock
);
881 memcpy(dst
, &state
->stateid
, sizeof(*dst
));
882 } while (read_seqretry(&state
->seqlock
, seq
));
883 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
886 spin_lock(&state
->state_lock
);
887 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_pid
, NFS4_ANY_LOCK_TYPE
);
888 if (lsp
!= NULL
&& (lsp
->ls_flags
& NFS_LOCK_INITIALIZED
) != 0)
889 memcpy(dst
, &lsp
->ls_stateid
, sizeof(*dst
));
890 spin_unlock(&state
->state_lock
);
891 nfs4_put_lock_state(lsp
);
894 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
896 struct nfs_seqid
*new;
898 new = kmalloc(sizeof(*new), gfp_mask
);
900 new->sequence
= counter
;
901 INIT_LIST_HEAD(&new->list
);
906 void nfs_release_seqid(struct nfs_seqid
*seqid
)
908 if (!list_empty(&seqid
->list
)) {
909 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
911 spin_lock(&sequence
->lock
);
912 list_del_init(&seqid
->list
);
913 spin_unlock(&sequence
->lock
);
914 rpc_wake_up(&sequence
->wait
);
918 void nfs_free_seqid(struct nfs_seqid
*seqid
)
920 nfs_release_seqid(seqid
);
925 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
926 * failed with a seqid incrementing error -
927 * see comments nfs_fs.h:seqid_mutating_error()
929 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
931 BUG_ON(list_first_entry(&seqid
->sequence
->sequence
->list
, struct nfs_seqid
, list
) != seqid
);
935 case -NFS4ERR_BAD_SEQID
:
936 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
938 printk(KERN_WARNING
"NFS: v4 server returned a bad"
939 " sequence-id error on an"
940 " unconfirmed sequence %p!\n",
942 case -NFS4ERR_STALE_CLIENTID
:
943 case -NFS4ERR_STALE_STATEID
:
944 case -NFS4ERR_BAD_STATEID
:
945 case -NFS4ERR_BADXDR
:
946 case -NFS4ERR_RESOURCE
:
947 case -NFS4ERR_NOFILEHANDLE
:
948 /* Non-seqid mutating errors */
952 * Note: no locking needed as we are guaranteed to be first
953 * on the sequence list
955 seqid
->sequence
->counter
++;
958 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
960 struct nfs4_state_owner
*sp
= container_of(seqid
->sequence
,
961 struct nfs4_state_owner
, so_seqid
);
962 struct nfs_server
*server
= sp
->so_server
;
964 if (status
== -NFS4ERR_BAD_SEQID
)
965 nfs4_drop_state_owner(sp
);
966 if (!nfs4_has_session(server
->nfs_client
))
967 nfs_increment_seqid(status
, seqid
);
971 * Increment the seqid if the LOCK/LOCKU succeeded, or
972 * failed with a seqid incrementing error -
973 * see comments nfs_fs.h:seqid_mutating_error()
975 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
977 nfs_increment_seqid(status
, seqid
);
980 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
982 struct rpc_sequence
*sequence
= seqid
->sequence
->sequence
;
985 spin_lock(&sequence
->lock
);
986 if (list_empty(&seqid
->list
))
987 list_add_tail(&seqid
->list
, &sequence
->list
);
988 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
990 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
993 spin_unlock(&sequence
->lock
);
997 static int nfs4_run_state_manager(void *);
999 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1001 smp_mb__before_clear_bit();
1002 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1003 smp_mb__after_clear_bit();
1004 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1005 rpc_wake_up(&clp
->cl_rpcwaitq
);
1009 * Schedule the nfs_client asynchronous state management routine
1011 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1013 struct task_struct
*task
;
1015 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1017 __module_get(THIS_MODULE
);
1018 atomic_inc(&clp
->cl_count
);
1019 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s-manager",
1020 rpc_peeraddr2str(clp
->cl_rpcclient
,
1024 nfs4_clear_state_manager_bit(clp
);
1025 nfs_put_client(clp
);
1026 module_put(THIS_MODULE
);
1030 * Schedule a lease recovery attempt
1032 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1036 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1037 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1038 nfs4_schedule_state_manager(clp
);
1041 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1044 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1045 /* Don't recover state that expired before the reboot */
1046 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1047 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1050 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1051 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1055 static int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1057 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1058 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1059 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1060 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1064 void nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1066 struct nfs_client
*clp
= server
->nfs_client
;
1068 nfs4_state_mark_reclaim_nograce(clp
, state
);
1069 nfs4_schedule_state_manager(clp
);
1072 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1074 struct inode
*inode
= state
->inode
;
1075 struct nfs_inode
*nfsi
= NFS_I(inode
);
1076 struct file_lock
*fl
;
1079 if (inode
->i_flock
== NULL
)
1082 /* Guard against delegation returns and new lock/unlock calls */
1083 down_write(&nfsi
->rwsem
);
1084 /* Protect inode->i_flock using the BKL */
1086 for (fl
= inode
->i_flock
; fl
!= NULL
; fl
= fl
->fl_next
) {
1087 if (!(fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)))
1089 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1092 status
= ops
->recover_lock(state
, fl
);
1097 case -NFS4ERR_ADMIN_REVOKED
:
1098 case -NFS4ERR_STALE_STATEID
:
1099 case -NFS4ERR_BAD_STATEID
:
1100 case -NFS4ERR_EXPIRED
:
1101 case -NFS4ERR_NO_GRACE
:
1102 case -NFS4ERR_STALE_CLIENTID
:
1103 case -NFS4ERR_BADSESSION
:
1104 case -NFS4ERR_BADSLOT
:
1105 case -NFS4ERR_BAD_HIGH_SLOT
:
1106 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1109 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1112 case -NFS4ERR_DENIED
:
1113 case -NFS4ERR_RECLAIM_BAD
:
1114 case -NFS4ERR_RECLAIM_CONFLICT
:
1115 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1122 up_write(&nfsi
->rwsem
);
1126 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1128 struct nfs4_state
*state
;
1129 struct nfs4_lock_state
*lock
;
1132 /* Note: we rely on the sp->so_states list being ordered
1133 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1135 * This is needed to ensure that the server won't give us any
1136 * read delegations that we have to return if, say, we are
1137 * recovering after a network partition or a reboot from a
1138 * server that doesn't support a grace period.
1141 spin_lock(&sp
->so_lock
);
1142 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1143 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1145 if (state
->state
== 0)
1147 atomic_inc(&state
->count
);
1148 spin_unlock(&sp
->so_lock
);
1149 status
= ops
->recover_open(sp
, state
);
1151 status
= nfs4_reclaim_locks(state
, ops
);
1153 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1154 if (!(lock
->ls_flags
& NFS_LOCK_INITIALIZED
))
1155 printk("%s: Lock reclaim failed!\n",
1158 nfs4_put_open_state(state
);
1164 printk(KERN_ERR
"%s: unhandled error %d. Zeroing state\n",
1170 * Open state on this file cannot be recovered
1171 * All we can do is revert to using the zero stateid.
1173 memset(state
->stateid
.data
, 0,
1174 sizeof(state
->stateid
.data
));
1175 /* Mark the file as being 'closed' */
1180 * User RPCSEC_GSS context has expired.
1181 * We cannot recover this stateid now, so
1182 * skip it and allow recovery thread to
1186 case -NFS4ERR_ADMIN_REVOKED
:
1187 case -NFS4ERR_STALE_STATEID
:
1188 case -NFS4ERR_BAD_STATEID
:
1189 case -NFS4ERR_RECLAIM_BAD
:
1190 case -NFS4ERR_RECLAIM_CONFLICT
:
1191 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1193 case -NFS4ERR_EXPIRED
:
1194 case -NFS4ERR_NO_GRACE
:
1195 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1196 case -NFS4ERR_STALE_CLIENTID
:
1197 case -NFS4ERR_BADSESSION
:
1198 case -NFS4ERR_BADSLOT
:
1199 case -NFS4ERR_BAD_HIGH_SLOT
:
1200 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1203 nfs4_put_open_state(state
);
1206 spin_unlock(&sp
->so_lock
);
1209 nfs4_put_open_state(state
);
1213 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1215 struct nfs4_lock_state
*lock
;
1217 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1218 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1219 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1220 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1221 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1222 lock
->ls_seqid
.flags
= 0;
1223 lock
->ls_flags
&= ~NFS_LOCK_INITIALIZED
;
1227 static void nfs4_reset_seqids(struct nfs_server
*server
,
1228 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1230 struct nfs_client
*clp
= server
->nfs_client
;
1231 struct nfs4_state_owner
*sp
;
1232 struct rb_node
*pos
;
1233 struct nfs4_state
*state
;
1235 spin_lock(&clp
->cl_lock
);
1236 for (pos
= rb_first(&server
->state_owners
);
1238 pos
= rb_next(pos
)) {
1239 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1240 sp
->so_seqid
.flags
= 0;
1241 spin_lock(&sp
->so_lock
);
1242 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1243 if (mark_reclaim(clp
, state
))
1244 nfs4_clear_open_state(state
);
1246 spin_unlock(&sp
->so_lock
);
1248 spin_unlock(&clp
->cl_lock
);
1251 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1252 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1254 struct nfs_server
*server
;
1257 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1258 nfs4_reset_seqids(server
, mark_reclaim
);
1262 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1264 /* Mark all delegations for reclaim */
1265 nfs_delegation_mark_reclaim(clp
);
1266 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1269 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1270 const struct nfs4_state_recovery_ops
*ops
)
1272 /* Notify the server we're done reclaiming our state */
1273 if (ops
->reclaim_complete
)
1274 (void)ops
->reclaim_complete(clp
);
1277 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1279 struct nfs_client
*clp
= server
->nfs_client
;
1280 struct nfs4_state_owner
*sp
;
1281 struct rb_node
*pos
;
1282 struct nfs4_state
*state
;
1284 spin_lock(&clp
->cl_lock
);
1285 for (pos
= rb_first(&server
->state_owners
);
1287 pos
= rb_next(pos
)) {
1288 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1289 spin_lock(&sp
->so_lock
);
1290 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1291 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1294 nfs4_state_mark_reclaim_nograce(clp
, state
);
1296 spin_unlock(&sp
->so_lock
);
1298 spin_unlock(&clp
->cl_lock
);
1301 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1303 struct nfs_server
*server
;
1305 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1309 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1310 nfs4_clear_reclaim_server(server
);
1313 nfs_delegation_reap_unclaimed(clp
);
1317 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1319 if (!nfs4_state_clear_reclaim_reboot(clp
))
1321 nfs4_reclaim_complete(clp
, clp
->cl_mvops
->reboot_recovery_ops
);
1324 static void nfs_delegation_clear_all(struct nfs_client
*clp
)
1326 nfs_delegation_mark_reclaim(clp
);
1327 nfs_delegation_reap_unclaimed(clp
);
1330 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1332 nfs_delegation_clear_all(clp
);
1333 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1336 static void nfs4_warn_keyexpired(const char *s
)
1338 printk_ratelimited(KERN_WARNING
"Error: state manager"
1339 " encountered RPCSEC_GSS session"
1340 " expired against NFSv4 server %s.\n",
1344 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1347 case -NFS4ERR_CB_PATH_DOWN
:
1348 nfs_handle_cb_pathdown(clp
);
1350 case -NFS4ERR_NO_GRACE
:
1351 nfs4_state_end_reclaim_reboot(clp
);
1353 case -NFS4ERR_STALE_CLIENTID
:
1354 case -NFS4ERR_LEASE_MOVED
:
1355 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1356 nfs4_state_clear_reclaim_reboot(clp
);
1357 nfs4_state_start_reclaim_reboot(clp
);
1359 case -NFS4ERR_EXPIRED
:
1360 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1361 nfs4_state_start_reclaim_nograce(clp
);
1363 case -NFS4ERR_BADSESSION
:
1364 case -NFS4ERR_BADSLOT
:
1365 case -NFS4ERR_BAD_HIGH_SLOT
:
1366 case -NFS4ERR_DEADSESSION
:
1367 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1368 case -NFS4ERR_SEQ_FALSE_RETRY
:
1369 case -NFS4ERR_SEQ_MISORDERED
:
1370 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1371 /* Zero session reset errors */
1374 /* Nothing we can do */
1375 nfs4_warn_keyexpired(clp
->cl_hostname
);
1381 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1383 struct nfs4_state_owner
*sp
;
1384 struct nfs_server
*server
;
1385 struct rb_node
*pos
;
1390 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1391 spin_lock(&clp
->cl_lock
);
1392 for (pos
= rb_first(&server
->state_owners
);
1394 pos
= rb_next(pos
)) {
1396 struct nfs4_state_owner
, so_server_node
);
1397 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1400 atomic_inc(&sp
->so_count
);
1401 spin_unlock(&clp
->cl_lock
);
1404 status
= nfs4_reclaim_open_state(sp
, ops
);
1406 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1407 nfs4_put_state_owner(sp
);
1408 return nfs4_recovery_handle_error(clp
, status
);
1411 nfs4_put_state_owner(sp
);
1414 spin_unlock(&clp
->cl_lock
);
1420 static int nfs4_check_lease(struct nfs_client
*clp
)
1422 struct rpc_cred
*cred
;
1423 const struct nfs4_state_maintenance_ops
*ops
=
1424 clp
->cl_mvops
->state_renewal_ops
;
1425 int status
= -NFS4ERR_EXPIRED
;
1427 /* Is the client already known to have an expired lease? */
1428 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1430 spin_lock(&clp
->cl_lock
);
1431 cred
= ops
->get_state_renewal_cred_locked(clp
);
1432 spin_unlock(&clp
->cl_lock
);
1434 cred
= nfs4_get_setclientid_cred(clp
);
1438 status
= ops
->renew_lease(clp
, cred
);
1441 return nfs4_recovery_handle_error(clp
, status
);
1444 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1446 struct rpc_cred
*cred
;
1447 const struct nfs4_state_recovery_ops
*ops
=
1448 clp
->cl_mvops
->reboot_recovery_ops
;
1449 int status
= -ENOENT
;
1451 cred
= ops
->get_clid_cred(clp
);
1453 status
= ops
->establish_clid(clp
, cred
);
1455 /* Handle case where the user hasn't set up machine creds */
1456 if (status
== -EACCES
&& cred
== clp
->cl_machine_cred
) {
1457 nfs4_clear_machine_cred(clp
);
1460 if (status
== -NFS4ERR_MINOR_VERS_MISMATCH
)
1461 status
= -EPROTONOSUPPORT
;
1466 #ifdef CONFIG_NFS_V4_1
1467 void nfs4_schedule_session_recovery(struct nfs4_session
*session
)
1469 struct nfs_client
*clp
= session
->clp
;
1471 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1472 nfs4_schedule_lease_recovery(clp
);
1474 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
1476 void nfs41_handle_recall_slot(struct nfs_client
*clp
)
1478 set_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1479 nfs4_schedule_state_manager(clp
);
1482 static void nfs4_reset_all_state(struct nfs_client
*clp
)
1484 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1485 clp
->cl_boot_time
= CURRENT_TIME
;
1486 nfs4_state_start_reclaim_nograce(clp
);
1487 nfs4_schedule_state_manager(clp
);
1491 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
1493 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
1494 nfs4_state_start_reclaim_reboot(clp
);
1495 nfs4_schedule_state_manager(clp
);
1499 static void nfs41_handle_state_revoked(struct nfs_client
*clp
)
1502 nfs4_reset_all_state(clp
);
1505 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
1507 /* This will need to handle layouts too */
1508 nfs_expire_all_delegations(clp
);
1511 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
1513 nfs_expire_all_delegations(clp
);
1514 if (test_and_set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) == 0)
1515 nfs4_schedule_state_manager(clp
);
1518 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
)
1522 else if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
1523 nfs41_handle_server_reboot(clp
);
1524 else if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
|
1525 SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
1526 SEQ4_STATUS_ADMIN_STATE_REVOKED
|
1527 SEQ4_STATUS_LEASE_MOVED
))
1528 nfs41_handle_state_revoked(clp
);
1529 else if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
1530 nfs41_handle_recallable_state_revoked(clp
);
1531 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
1532 SEQ4_STATUS_BACKCHANNEL_FAULT
|
1533 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
1534 nfs41_handle_cb_path_down(clp
);
1537 static int nfs4_reset_session(struct nfs_client
*clp
)
1541 nfs4_begin_drain_session(clp
);
1542 status
= nfs4_proc_destroy_session(clp
->cl_session
);
1543 if (status
&& status
!= -NFS4ERR_BADSESSION
&&
1544 status
!= -NFS4ERR_DEADSESSION
) {
1545 status
= nfs4_recovery_handle_error(clp
, status
);
1549 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
1550 status
= nfs4_proc_create_session(clp
);
1552 status
= nfs4_recovery_handle_error(clp
, status
);
1555 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1556 /* create_session negotiated new slot table */
1557 clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
);
1559 /* Let the state manager reestablish state */
1560 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1561 nfs41_setup_state_renewal(clp
);
1566 static int nfs4_recall_slot(struct nfs_client
*clp
)
1568 struct nfs4_slot_table
*fc_tbl
= &clp
->cl_session
->fc_slot_table
;
1569 struct nfs4_channel_attrs
*fc_attrs
= &clp
->cl_session
->fc_attrs
;
1570 struct nfs4_slot
*new, *old
;
1573 nfs4_begin_drain_session(clp
);
1574 new = kmalloc(fc_tbl
->target_max_slots
* sizeof(struct nfs4_slot
),
1579 spin_lock(&fc_tbl
->slot_tbl_lock
);
1580 for (i
= 0; i
< fc_tbl
->target_max_slots
; i
++)
1581 new[i
].seq_nr
= fc_tbl
->slots
[i
].seq_nr
;
1582 old
= fc_tbl
->slots
;
1583 fc_tbl
->slots
= new;
1584 fc_tbl
->max_slots
= fc_tbl
->target_max_slots
;
1585 fc_tbl
->target_max_slots
= 0;
1586 fc_attrs
->max_reqs
= fc_tbl
->max_slots
;
1587 spin_unlock(&fc_tbl
->slot_tbl_lock
);
1590 nfs4_end_drain_session(clp
);
1594 #else /* CONFIG_NFS_V4_1 */
1595 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
1596 static int nfs4_end_drain_session(struct nfs_client
*clp
) { return 0; }
1597 static int nfs4_recall_slot(struct nfs_client
*clp
) { return 0; }
1598 #endif /* CONFIG_NFS_V4_1 */
1600 /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
1601 * on EXCHANGE_ID for v4.1
1603 static void nfs4_set_lease_expired(struct nfs_client
*clp
, int status
)
1606 case -NFS4ERR_CLID_INUSE
:
1607 case -NFS4ERR_STALE_CLIENTID
:
1608 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1610 case -NFS4ERR_DELAY
:
1617 nfs4_warn_keyexpired(clp
->cl_hostname
);
1618 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1619 * in nfs4_exchange_id */
1623 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1626 static void nfs4_state_manager(struct nfs_client
*clp
)
1630 /* Ensure exclusive access to NFSv4 state */
1632 if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
1633 /* We're going to have to re-establish a clientid */
1634 status
= nfs4_reclaim_lease(clp
);
1636 nfs4_set_lease_expired(clp
, status
);
1637 if (test_bit(NFS4CLNT_LEASE_EXPIRED
,
1640 if (clp
->cl_cons_state
==
1641 NFS_CS_SESSION_INITING
)
1642 nfs_mark_client_ready(clp
, status
);
1645 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1646 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1647 pnfs_destroy_all_layouts(clp
);
1650 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
1651 status
= nfs4_check_lease(clp
);
1652 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1654 if (status
< 0 && status
!= -NFS4ERR_CB_PATH_DOWN
)
1658 /* Initialize or reset the session */
1659 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)
1660 && nfs4_has_session(clp
)) {
1661 status
= nfs4_reset_session(clp
);
1662 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1668 /* First recover reboot state... */
1669 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
1670 status
= nfs4_do_reclaim(clp
,
1671 clp
->cl_mvops
->reboot_recovery_ops
);
1672 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1673 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
))
1675 nfs4_state_end_reclaim_reboot(clp
);
1676 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1682 /* Now recover expired state... */
1683 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
1684 status
= nfs4_do_reclaim(clp
,
1685 clp
->cl_mvops
->nograce_recovery_ops
);
1686 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) ||
1687 test_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
) ||
1688 test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1694 nfs4_end_drain_session(clp
);
1695 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
1696 nfs_client_return_marked_delegations(clp
);
1699 /* Recall session slots */
1700 if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT
, &clp
->cl_state
)
1701 && nfs4_has_session(clp
)) {
1702 status
= nfs4_recall_slot(clp
);
1709 nfs4_clear_state_manager_bit(clp
);
1710 /* Did we race with an attempt to give us more work? */
1711 if (clp
->cl_state
== 0)
1713 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1715 } while (atomic_read(&clp
->cl_count
) > 1);
1718 printk(KERN_WARNING
"Error: state manager failed on NFSv4 server %s"
1719 " with error %d\n", clp
->cl_hostname
, -status
);
1720 nfs4_end_drain_session(clp
);
1721 nfs4_clear_state_manager_bit(clp
);
1724 static int nfs4_run_state_manager(void *ptr
)
1726 struct nfs_client
*clp
= ptr
;
1728 allow_signal(SIGKILL
);
1729 nfs4_state_manager(clp
);
1730 nfs_put_client(clp
);
1731 module_put_and_exit(0);