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/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid
= {
70 .type
= NFS4_SPECIAL_STATEID_TYPE
,
72 static DEFINE_MUTEX(nfs_clid_init_mutex
);
74 int nfs4_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
76 struct nfs4_setclientid_res clid
= {
77 .clientid
= clp
->cl_clientid
,
78 .confirm
= clp
->cl_confirm
,
82 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
84 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
86 port
= nn
->nfs_callback_tcpport
;
87 if (clp
->cl_addr
.ss_family
== AF_INET6
)
88 port
= nn
->nfs_callback_tcpport6
;
90 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
93 clp
->cl_clientid
= clid
.clientid
;
94 clp
->cl_confirm
= clid
.confirm
;
95 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
97 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
100 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
101 nfs4_schedule_state_renewal(clp
);
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
117 * Note: The returned client may not yet be marked ready.
119 int nfs40_discover_server_trunking(struct nfs_client
*clp
,
120 struct nfs_client
**result
,
121 struct rpc_cred
*cred
)
123 struct nfs4_setclientid_res clid
= {
124 .clientid
= clp
->cl_clientid
,
125 .confirm
= clp
->cl_confirm
,
127 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
131 port
= nn
->nfs_callback_tcpport
;
132 if (clp
->cl_addr
.ss_family
== AF_INET6
)
133 port
= nn
->nfs_callback_tcpport6
;
135 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
138 clp
->cl_clientid
= clid
.clientid
;
139 clp
->cl_confirm
= clid
.confirm
;
141 status
= nfs40_walk_client_list(clp
, result
, cred
);
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result
);
151 struct rpc_cred
*nfs4_get_machine_cred_locked(struct nfs_client
*clp
)
153 struct rpc_cred
*cred
= NULL
;
155 if (clp
->cl_machine_cred
!= NULL
)
156 cred
= get_rpccred(clp
->cl_machine_cred
);
160 static void nfs4_root_machine_cred(struct nfs_client
*clp
)
162 struct rpc_cred
*cred
, *new;
164 new = rpc_lookup_machine_cred(NULL
);
165 spin_lock(&clp
->cl_lock
);
166 cred
= clp
->cl_machine_cred
;
167 clp
->cl_machine_cred
= new;
168 spin_unlock(&clp
->cl_lock
);
173 static struct rpc_cred
*
174 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
176 struct rpc_cred
*cred
= NULL
;
177 struct nfs4_state_owner
*sp
;
180 for (pos
= rb_first(&server
->state_owners
);
182 pos
= rb_next(pos
)) {
183 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
184 if (list_empty(&sp
->so_states
))
186 cred
= get_rpccred(sp
->so_cred
);
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
199 struct rpc_cred
*nfs4_get_renew_cred_locked(struct nfs_client
*clp
)
201 struct rpc_cred
*cred
= NULL
;
202 struct nfs_server
*server
;
204 /* Use machine credentials if available */
205 cred
= nfs4_get_machine_cred_locked(clp
);
210 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
211 cred
= nfs4_get_renew_cred_server_locked(server
);
221 static void nfs4_end_drain_slot_table(struct nfs4_slot_table
*tbl
)
223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
)) {
224 spin_lock(&tbl
->slot_tbl_lock
);
225 nfs41_wake_slot_table(tbl
);
226 spin_unlock(&tbl
->slot_tbl_lock
);
230 static void nfs4_end_drain_session(struct nfs_client
*clp
)
232 struct nfs4_session
*ses
= clp
->cl_session
;
234 if (clp
->cl_slot_tbl
) {
235 nfs4_end_drain_slot_table(clp
->cl_slot_tbl
);
240 nfs4_end_drain_slot_table(&ses
->bc_slot_table
);
241 nfs4_end_drain_slot_table(&ses
->fc_slot_table
);
245 static int nfs4_drain_slot_tbl(struct nfs4_slot_table
*tbl
)
247 set_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
);
248 spin_lock(&tbl
->slot_tbl_lock
);
249 if (tbl
->highest_used_slotid
!= NFS4_NO_SLOT
) {
250 reinit_completion(&tbl
->complete
);
251 spin_unlock(&tbl
->slot_tbl_lock
);
252 return wait_for_completion_interruptible(&tbl
->complete
);
254 spin_unlock(&tbl
->slot_tbl_lock
);
258 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
260 struct nfs4_session
*ses
= clp
->cl_session
;
263 if (clp
->cl_slot_tbl
)
264 return nfs4_drain_slot_tbl(clp
->cl_slot_tbl
);
267 ret
= nfs4_drain_slot_tbl(&ses
->bc_slot_table
);
271 return nfs4_drain_slot_tbl(&ses
->fc_slot_table
);
274 #if defined(CONFIG_NFS_V4_1)
276 static int nfs41_setup_state_renewal(struct nfs_client
*clp
)
279 struct nfs_fsinfo fsinfo
;
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
)) {
283 nfs4_schedule_state_renewal(clp
);
288 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
290 nfs4_set_lease_period(clp
, fsinfo
.lease_time
* HZ
, now
);
291 nfs4_schedule_state_renewal(clp
);
297 static void nfs41_finish_session_reset(struct nfs_client
*clp
)
299 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
300 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
303 nfs41_setup_state_renewal(clp
);
306 int nfs41_init_clientid(struct nfs_client
*clp
, struct rpc_cred
*cred
)
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
312 status
= nfs4_proc_exchange_id(clp
, cred
);
315 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
317 status
= nfs4_proc_create_session(clp
, cred
);
320 nfs41_finish_session_reset(clp
);
321 nfs_mark_client_ready(clp
, NFS_CS_READY
);
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
337 * Note: The returned client may not yet be marked ready.
339 int nfs41_discover_server_trunking(struct nfs_client
*clp
,
340 struct nfs_client
**result
,
341 struct rpc_cred
*cred
)
345 status
= nfs4_proc_exchange_id(clp
, cred
);
346 if (status
!= NFS4_OK
)
349 status
= nfs41_walk_client_list(clp
, result
, cred
);
355 /* Purge state if the client id was established in a prior instance */
356 if (clp
->cl_exchange_flags
& EXCHGID4_FLAG_CONFIRMED_R
)
357 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
359 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
360 nfs4_schedule_state_manager(clp
);
361 status
= nfs_wait_client_init_complete(clp
);
367 #endif /* CONFIG_NFS_V4_1 */
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
373 * Returns an rpc_cred with reference count bumped, or NULL.
375 struct rpc_cred
*nfs4_get_clid_cred(struct nfs_client
*clp
)
377 struct rpc_cred
*cred
;
379 spin_lock(&clp
->cl_lock
);
380 cred
= nfs4_get_machine_cred_locked(clp
);
381 spin_unlock(&clp
->cl_lock
);
385 static struct nfs4_state_owner
*
386 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
388 struct rb_node
**p
= &server
->state_owners
.rb_node
,
390 struct nfs4_state_owner
*sp
;
394 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
396 if (cred
< sp
->so_cred
)
397 p
= &parent
->rb_left
;
398 else if (cred
> sp
->so_cred
)
399 p
= &parent
->rb_right
;
401 if (!list_empty(&sp
->so_lru
))
402 list_del_init(&sp
->so_lru
);
403 atomic_inc(&sp
->so_count
);
410 static struct nfs4_state_owner
*
411 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
413 struct nfs_server
*server
= new->so_server
;
414 struct rb_node
**p
= &server
->state_owners
.rb_node
,
416 struct nfs4_state_owner
*sp
;
421 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
423 if (new->so_cred
< sp
->so_cred
)
424 p
= &parent
->rb_left
;
425 else if (new->so_cred
> sp
->so_cred
)
426 p
= &parent
->rb_right
;
428 if (!list_empty(&sp
->so_lru
))
429 list_del_init(&sp
->so_lru
);
430 atomic_inc(&sp
->so_count
);
434 err
= ida_get_new(&server
->openowner_id
, &new->so_seqid
.owner_id
);
437 rb_link_node(&new->so_server_node
, parent
, p
);
438 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
443 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
445 struct nfs_server
*server
= sp
->so_server
;
447 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
448 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
449 ida_remove(&server
->openowner_id
, sp
->so_seqid
.owner_id
);
453 nfs4_init_seqid_counter(struct nfs_seqid_counter
*sc
)
455 sc
->create_time
= ktime_get();
458 spin_lock_init(&sc
->lock
);
459 INIT_LIST_HEAD(&sc
->list
);
460 rpc_init_wait_queue(&sc
->wait
, "Seqid_waitqueue");
464 nfs4_destroy_seqid_counter(struct nfs_seqid_counter
*sc
)
466 rpc_destroy_wait_queue(&sc
->wait
);
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
474 static struct nfs4_state_owner
*
475 nfs4_alloc_state_owner(struct nfs_server
*server
,
476 struct rpc_cred
*cred
,
479 struct nfs4_state_owner
*sp
;
481 sp
= kzalloc(sizeof(*sp
), gfp_flags
);
484 sp
->so_server
= server
;
485 sp
->so_cred
= get_rpccred(cred
);
486 spin_lock_init(&sp
->so_lock
);
487 INIT_LIST_HEAD(&sp
->so_states
);
488 nfs4_init_seqid_counter(&sp
->so_seqid
);
489 atomic_set(&sp
->so_count
, 1);
490 INIT_LIST_HEAD(&sp
->so_lru
);
491 seqcount_init(&sp
->so_reclaim_seqcount
);
492 mutex_init(&sp
->so_delegreturn_mutex
);
497 nfs4_drop_state_owner(struct nfs4_state_owner
*sp
)
499 struct rb_node
*rb_node
= &sp
->so_server_node
;
501 if (!RB_EMPTY_NODE(rb_node
)) {
502 struct nfs_server
*server
= sp
->so_server
;
503 struct nfs_client
*clp
= server
->nfs_client
;
505 spin_lock(&clp
->cl_lock
);
506 if (!RB_EMPTY_NODE(rb_node
)) {
507 rb_erase(rb_node
, &server
->state_owners
);
508 RB_CLEAR_NODE(rb_node
);
510 spin_unlock(&clp
->cl_lock
);
514 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
516 nfs4_destroy_seqid_counter(&sp
->so_seqid
);
517 put_rpccred(sp
->so_cred
);
521 static void nfs4_gc_state_owners(struct nfs_server
*server
)
523 struct nfs_client
*clp
= server
->nfs_client
;
524 struct nfs4_state_owner
*sp
, *tmp
;
525 unsigned long time_min
, time_max
;
528 spin_lock(&clp
->cl_lock
);
530 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
531 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
532 /* NB: LRU is sorted so that oldest is at the head */
533 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
535 list_move(&sp
->so_lru
, &doomed
);
536 nfs4_remove_state_owner_locked(sp
);
538 spin_unlock(&clp
->cl_lock
);
540 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
541 list_del(&sp
->so_lru
);
542 nfs4_free_state_owner(sp
);
547 * nfs4_get_state_owner - Look up a state owner given a credential
548 * @server: nfs_server to search
549 * @cred: RPC credential to match
551 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
553 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
554 struct rpc_cred
*cred
,
557 struct nfs_client
*clp
= server
->nfs_client
;
558 struct nfs4_state_owner
*sp
, *new;
560 spin_lock(&clp
->cl_lock
);
561 sp
= nfs4_find_state_owner_locked(server
, cred
);
562 spin_unlock(&clp
->cl_lock
);
565 new = nfs4_alloc_state_owner(server
, cred
, gfp_flags
);
569 if (ida_pre_get(&server
->openowner_id
, gfp_flags
) == 0)
571 spin_lock(&clp
->cl_lock
);
572 sp
= nfs4_insert_state_owner_locked(new);
573 spin_unlock(&clp
->cl_lock
);
574 } while (sp
== ERR_PTR(-EAGAIN
));
576 nfs4_free_state_owner(new);
578 nfs4_gc_state_owners(server
);
583 * nfs4_put_state_owner - Release a nfs4_state_owner
584 * @sp: state owner data to release
586 * Note that we keep released state owners on an LRU
588 * This caches valid state owners so that they can be
589 * reused, to avoid the OPEN_CONFIRM on minor version 0.
590 * It also pins the uniquifier of dropped state owners for
591 * a while, to ensure that those state owner names are
594 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
596 struct nfs_server
*server
= sp
->so_server
;
597 struct nfs_client
*clp
= server
->nfs_client
;
599 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
602 sp
->so_expires
= jiffies
;
603 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
604 spin_unlock(&clp
->cl_lock
);
608 * nfs4_purge_state_owners - Release all cached state owners
609 * @server: nfs_server with cached state owners to release
611 * Called at umount time. Remaining state owners will be on
612 * the LRU with ref count of zero.
614 void nfs4_purge_state_owners(struct nfs_server
*server
)
616 struct nfs_client
*clp
= server
->nfs_client
;
617 struct nfs4_state_owner
*sp
, *tmp
;
620 spin_lock(&clp
->cl_lock
);
621 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
622 list_move(&sp
->so_lru
, &doomed
);
623 nfs4_remove_state_owner_locked(sp
);
625 spin_unlock(&clp
->cl_lock
);
627 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
628 list_del(&sp
->so_lru
);
629 nfs4_free_state_owner(sp
);
633 static struct nfs4_state
*
634 nfs4_alloc_open_state(void)
636 struct nfs4_state
*state
;
638 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
641 atomic_set(&state
->count
, 1);
642 INIT_LIST_HEAD(&state
->lock_states
);
643 spin_lock_init(&state
->state_lock
);
644 seqlock_init(&state
->seqlock
);
649 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
651 if (state
->state
== fmode
)
653 /* NB! List reordering - see the reclaim code for why. */
654 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
655 if (fmode
& FMODE_WRITE
)
656 list_move(&state
->open_states
, &state
->owner
->so_states
);
658 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
660 state
->state
= fmode
;
663 static struct nfs4_state
*
664 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
666 struct nfs_inode
*nfsi
= NFS_I(inode
);
667 struct nfs4_state
*state
;
669 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
670 if (state
->owner
!= owner
)
672 if (!nfs4_valid_open_stateid(state
))
674 if (atomic_inc_not_zero(&state
->count
))
681 nfs4_free_open_state(struct nfs4_state
*state
)
687 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
689 struct nfs4_state
*state
, *new;
690 struct nfs_inode
*nfsi
= NFS_I(inode
);
692 spin_lock(&inode
->i_lock
);
693 state
= __nfs4_find_state_byowner(inode
, owner
);
694 spin_unlock(&inode
->i_lock
);
697 new = nfs4_alloc_open_state();
698 spin_lock(&owner
->so_lock
);
699 spin_lock(&inode
->i_lock
);
700 state
= __nfs4_find_state_byowner(inode
, owner
);
701 if (state
== NULL
&& new != NULL
) {
703 state
->owner
= owner
;
704 atomic_inc(&owner
->so_count
);
705 list_add(&state
->inode_states
, &nfsi
->open_states
);
707 state
->inode
= inode
;
708 spin_unlock(&inode
->i_lock
);
709 /* Note: The reclaim code dictates that we add stateless
710 * and read-only stateids to the end of the list */
711 list_add_tail(&state
->open_states
, &owner
->so_states
);
712 spin_unlock(&owner
->so_lock
);
714 spin_unlock(&inode
->i_lock
);
715 spin_unlock(&owner
->so_lock
);
717 nfs4_free_open_state(new);
723 void nfs4_put_open_state(struct nfs4_state
*state
)
725 struct inode
*inode
= state
->inode
;
726 struct nfs4_state_owner
*owner
= state
->owner
;
728 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
730 spin_lock(&inode
->i_lock
);
731 list_del(&state
->inode_states
);
732 list_del(&state
->open_states
);
733 spin_unlock(&inode
->i_lock
);
734 spin_unlock(&owner
->so_lock
);
736 nfs4_free_open_state(state
);
737 nfs4_put_state_owner(owner
);
741 * Close the current file.
743 static void __nfs4_close(struct nfs4_state
*state
,
744 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
746 struct nfs4_state_owner
*owner
= state
->owner
;
750 atomic_inc(&owner
->so_count
);
751 /* Protect against nfs4_find_state() */
752 spin_lock(&owner
->so_lock
);
753 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
760 case FMODE_READ
|FMODE_WRITE
:
763 newstate
= FMODE_READ
|FMODE_WRITE
;
764 if (state
->n_rdwr
== 0) {
765 if (state
->n_rdonly
== 0) {
766 newstate
&= ~FMODE_READ
;
767 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
768 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
770 if (state
->n_wronly
== 0) {
771 newstate
&= ~FMODE_WRITE
;
772 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
773 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
776 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
778 nfs4_state_set_mode_locked(state
, newstate
);
779 spin_unlock(&owner
->so_lock
);
782 nfs4_put_open_state(state
);
783 nfs4_put_state_owner(owner
);
785 nfs4_do_close(state
, gfp_mask
, wait
);
788 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
790 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
793 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
795 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
799 * Search the state->lock_states for an existing lock_owner
800 * that is compatible with current->files
802 static struct nfs4_lock_state
*
803 __nfs4_find_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
805 struct nfs4_lock_state
*pos
;
806 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
807 if (pos
->ls_owner
!= fl_owner
)
809 atomic_inc(&pos
->ls_count
);
816 * Return a compatible lock_state. If no initialized lock_state structure
817 * exists, return an uninitialized one.
820 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
822 struct nfs4_lock_state
*lsp
;
823 struct nfs_server
*server
= state
->owner
->so_server
;
825 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
828 nfs4_init_seqid_counter(&lsp
->ls_seqid
);
829 atomic_set(&lsp
->ls_count
, 1);
830 lsp
->ls_state
= state
;
831 lsp
->ls_owner
= fl_owner
;
832 lsp
->ls_seqid
.owner_id
= ida_simple_get(&server
->lockowner_id
, 0, 0, GFP_NOFS
);
833 if (lsp
->ls_seqid
.owner_id
< 0)
835 INIT_LIST_HEAD(&lsp
->ls_locks
);
842 void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
)
844 ida_simple_remove(&server
->lockowner_id
, lsp
->ls_seqid
.owner_id
);
845 nfs4_destroy_seqid_counter(&lsp
->ls_seqid
);
850 * Return a compatible lock_state. If no initialized lock_state structure
851 * exists, return an uninitialized one.
854 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
856 struct nfs4_lock_state
*lsp
, *new = NULL
;
859 spin_lock(&state
->state_lock
);
860 lsp
= __nfs4_find_lock_state(state
, owner
);
864 list_add(&new->ls_locks
, &state
->lock_states
);
865 set_bit(LK_STATE_IN_USE
, &state
->flags
);
870 spin_unlock(&state
->state_lock
);
871 new = nfs4_alloc_lock_state(state
, owner
);
875 spin_unlock(&state
->state_lock
);
877 nfs4_free_lock_state(state
->owner
->so_server
, new);
882 * Release reference to lock_state, and free it if we see that
883 * it is no longer in use
885 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
887 struct nfs_server
*server
;
888 struct nfs4_state
*state
;
892 state
= lsp
->ls_state
;
893 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
895 list_del(&lsp
->ls_locks
);
896 if (list_empty(&state
->lock_states
))
897 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
898 spin_unlock(&state
->state_lock
);
899 server
= state
->owner
->so_server
;
900 if (test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
)) {
901 struct nfs_client
*clp
= server
->nfs_client
;
903 clp
->cl_mvops
->free_lock_state(server
, lsp
);
905 nfs4_free_lock_state(server
, lsp
);
908 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
910 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
912 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
913 atomic_inc(&lsp
->ls_count
);
916 static void nfs4_fl_release_lock(struct file_lock
*fl
)
918 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
921 static const struct file_lock_operations nfs4_fl_lock_ops
= {
922 .fl_copy_lock
= nfs4_fl_copy_lock
,
923 .fl_release_private
= nfs4_fl_release_lock
,
926 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
928 struct nfs4_lock_state
*lsp
;
930 if (fl
->fl_ops
!= NULL
)
932 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
935 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
936 fl
->fl_ops
= &nfs4_fl_lock_ops
;
940 static int nfs4_copy_lock_stateid(nfs4_stateid
*dst
,
941 struct nfs4_state
*state
,
942 const struct nfs_lockowner
*lockowner
)
944 struct nfs4_lock_state
*lsp
;
949 if (lockowner
== NULL
)
952 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
955 fl_owner
= lockowner
->l_owner
;
956 spin_lock(&state
->state_lock
);
957 lsp
= __nfs4_find_lock_state(state
, fl_owner
);
958 if (lsp
&& test_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
))
960 else if (lsp
!= NULL
&& test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
) != 0) {
961 nfs4_stateid_copy(dst
, &lsp
->ls_stateid
);
964 spin_unlock(&state
->state_lock
);
965 nfs4_put_lock_state(lsp
);
970 static void nfs4_copy_open_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
)
972 const nfs4_stateid
*src
;
977 seq
= read_seqbegin(&state
->seqlock
);
978 if (test_bit(NFS_OPEN_STATE
, &state
->flags
))
979 src
= &state
->open_stateid
;
980 nfs4_stateid_copy(dst
, src
);
981 } while (read_seqretry(&state
->seqlock
, seq
));
985 * Byte-range lock aware utility to initialize the stateid of read/write
988 int nfs4_select_rw_stateid(struct nfs4_state
*state
,
989 fmode_t fmode
, const struct nfs_lockowner
*lockowner
,
990 nfs4_stateid
*dst
, struct rpc_cred
**cred
)
994 if (!nfs4_valid_open_stateid(state
))
998 ret
= nfs4_copy_lock_stateid(dst
, state
, lockowner
);
1000 /* A lost lock - don't even consider delegations */
1002 /* returns true if delegation stateid found and copied */
1003 if (nfs4_copy_delegation_stateid(state
->inode
, fmode
, dst
, cred
)) {
1008 /* nfs4_copy_delegation_stateid() didn't over-write
1009 * dst, so it still has the lock stateid which we now
1013 nfs4_copy_open_stateid(dst
, state
);
1016 if (nfs_server_capable(state
->inode
, NFS_CAP_STATEID_NFSV41
))
1021 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
1023 struct nfs_seqid
*new;
1025 new = kmalloc(sizeof(*new), gfp_mask
);
1027 return ERR_PTR(-ENOMEM
);
1028 new->sequence
= counter
;
1029 INIT_LIST_HEAD(&new->list
);
1034 void nfs_release_seqid(struct nfs_seqid
*seqid
)
1036 struct nfs_seqid_counter
*sequence
;
1038 if (seqid
== NULL
|| list_empty(&seqid
->list
))
1040 sequence
= seqid
->sequence
;
1041 spin_lock(&sequence
->lock
);
1042 list_del_init(&seqid
->list
);
1043 if (!list_empty(&sequence
->list
)) {
1044 struct nfs_seqid
*next
;
1046 next
= list_first_entry(&sequence
->list
,
1047 struct nfs_seqid
, list
);
1048 rpc_wake_up_queued_task(&sequence
->wait
, next
->task
);
1050 spin_unlock(&sequence
->lock
);
1053 void nfs_free_seqid(struct nfs_seqid
*seqid
)
1055 nfs_release_seqid(seqid
);
1060 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1061 * failed with a seqid incrementing error -
1062 * see comments nfs4.h:seqid_mutating_error()
1064 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
1069 case -NFS4ERR_BAD_SEQID
:
1070 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
1072 pr_warn_ratelimited("NFS: v4 server returned a bad"
1073 " sequence-id error on an"
1074 " unconfirmed sequence %p!\n",
1076 case -NFS4ERR_STALE_CLIENTID
:
1077 case -NFS4ERR_STALE_STATEID
:
1078 case -NFS4ERR_BAD_STATEID
:
1079 case -NFS4ERR_BADXDR
:
1080 case -NFS4ERR_RESOURCE
:
1081 case -NFS4ERR_NOFILEHANDLE
:
1082 /* Non-seqid mutating errors */
1086 * Note: no locking needed as we are guaranteed to be first
1087 * on the sequence list
1089 seqid
->sequence
->counter
++;
1092 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
1094 struct nfs4_state_owner
*sp
;
1099 sp
= container_of(seqid
->sequence
, struct nfs4_state_owner
, so_seqid
);
1100 if (status
== -NFS4ERR_BAD_SEQID
)
1101 nfs4_drop_state_owner(sp
);
1102 if (!nfs4_has_session(sp
->so_server
->nfs_client
))
1103 nfs_increment_seqid(status
, seqid
);
1107 * Increment the seqid if the LOCK/LOCKU succeeded, or
1108 * failed with a seqid incrementing error -
1109 * see comments nfs4.h:seqid_mutating_error()
1111 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
1114 nfs_increment_seqid(status
, seqid
);
1117 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
1119 struct nfs_seqid_counter
*sequence
;
1124 sequence
= seqid
->sequence
;
1125 spin_lock(&sequence
->lock
);
1127 if (list_empty(&seqid
->list
))
1128 list_add_tail(&seqid
->list
, &sequence
->list
);
1129 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
1131 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
1134 spin_unlock(&sequence
->lock
);
1139 static int nfs4_run_state_manager(void *);
1141 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1143 smp_mb__before_atomic();
1144 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1145 smp_mb__after_atomic();
1146 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1147 rpc_wake_up(&clp
->cl_rpcwaitq
);
1151 * Schedule the nfs_client asynchronous state management routine
1153 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1155 struct task_struct
*task
;
1156 char buf
[INET6_ADDRSTRLEN
+ sizeof("-manager") + 1];
1158 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1160 __module_get(THIS_MODULE
);
1161 atomic_inc(&clp
->cl_count
);
1163 /* The rcu_read_lock() is not strictly necessary, as the state
1164 * manager is the only thread that ever changes the rpc_xprt
1165 * after it's initialized. At this point, we're single threaded. */
1167 snprintf(buf
, sizeof(buf
), "%s-manager",
1168 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_ADDR
));
1170 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s", buf
);
1172 printk(KERN_ERR
"%s: kthread_run: %ld\n",
1173 __func__
, PTR_ERR(task
));
1174 nfs4_clear_state_manager_bit(clp
);
1175 nfs_put_client(clp
);
1176 module_put(THIS_MODULE
);
1181 * Schedule a lease recovery attempt
1183 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1187 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1188 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1189 dprintk("%s: scheduling lease recovery for server %s\n", __func__
,
1191 nfs4_schedule_state_manager(clp
);
1193 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery
);
1196 * nfs4_schedule_migration_recovery - trigger migration recovery
1198 * @server: FSID that is migrating
1200 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1201 * value is returned.
1203 int nfs4_schedule_migration_recovery(const struct nfs_server
*server
)
1205 struct nfs_client
*clp
= server
->nfs_client
;
1207 if (server
->fh_expire_type
!= NFS4_FH_PERSISTENT
) {
1208 pr_err("NFS: volatile file handles not supported (server %s)\n",
1213 if (test_bit(NFS_MIG_FAILED
, &server
->mig_status
))
1216 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1218 (unsigned long long)server
->fsid
.major
,
1219 (unsigned long long)server
->fsid
.minor
,
1222 set_bit(NFS_MIG_IN_TRANSITION
,
1223 &((struct nfs_server
*)server
)->mig_status
);
1224 set_bit(NFS4CLNT_MOVED
, &clp
->cl_state
);
1226 nfs4_schedule_state_manager(clp
);
1229 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery
);
1232 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1234 * @clp: server to check for moved leases
1237 void nfs4_schedule_lease_moved_recovery(struct nfs_client
*clp
)
1239 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1240 __func__
, clp
->cl_clientid
, clp
->cl_hostname
);
1242 set_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
);
1243 nfs4_schedule_state_manager(clp
);
1245 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery
);
1247 int nfs4_wait_clnt_recover(struct nfs_client
*clp
)
1253 atomic_inc(&clp
->cl_count
);
1254 res
= wait_on_bit_action(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
,
1255 nfs_wait_bit_killable
, TASK_KILLABLE
);
1258 if (clp
->cl_cons_state
< 0)
1259 res
= clp
->cl_cons_state
;
1261 nfs_put_client(clp
);
1265 int nfs4_client_recover_expired_lease(struct nfs_client
*clp
)
1270 for (loop
= NFS4_MAX_LOOP_ON_RECOVER
; loop
!= 0; loop
--) {
1271 ret
= nfs4_wait_clnt_recover(clp
);
1274 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) &&
1275 !test_bit(NFS4CLNT_CHECK_LEASE
,&clp
->cl_state
))
1277 nfs4_schedule_state_manager(clp
);
1284 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1285 * @clp: client to process
1287 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1288 * resend of the SETCLIENTID and hence re-establish the
1289 * callback channel. Then return all existing delegations.
1291 static void nfs40_handle_cb_pathdown(struct nfs_client
*clp
)
1293 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1294 nfs_expire_all_delegations(clp
);
1295 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__
,
1299 void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
)
1301 nfs40_handle_cb_pathdown(clp
);
1302 nfs4_schedule_state_manager(clp
);
1305 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1308 if (!nfs4_valid_open_stateid(state
))
1310 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1311 /* Don't recover state that expired before the reboot */
1312 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1313 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1316 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1317 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1321 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1323 if (!nfs4_valid_open_stateid(state
))
1325 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1326 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1327 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1328 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1332 int nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1334 struct nfs_client
*clp
= server
->nfs_client
;
1336 if (!nfs4_state_mark_reclaim_nograce(clp
, state
))
1338 dprintk("%s: scheduling stateid recovery for server %s\n", __func__
,
1340 nfs4_schedule_state_manager(clp
);
1343 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery
);
1345 static struct nfs4_lock_state
*
1346 nfs_state_find_lock_state_by_stateid(struct nfs4_state
*state
,
1347 const nfs4_stateid
*stateid
)
1349 struct nfs4_lock_state
*pos
;
1351 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
1352 if (!test_bit(NFS_LOCK_INITIALIZED
, &pos
->ls_flags
))
1354 if (nfs4_stateid_match_other(&pos
->ls_stateid
, stateid
))
1360 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state
*state
,
1361 const nfs4_stateid
*stateid
)
1365 if (test_bit(LK_STATE_IN_USE
, &state
->flags
)) {
1366 spin_lock(&state
->state_lock
);
1367 if (nfs_state_find_lock_state_by_stateid(state
, stateid
))
1369 spin_unlock(&state
->state_lock
);
1374 void nfs_inode_find_state_and_recover(struct inode
*inode
,
1375 const nfs4_stateid
*stateid
)
1377 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
1378 struct nfs_inode
*nfsi
= NFS_I(inode
);
1379 struct nfs_open_context
*ctx
;
1380 struct nfs4_state
*state
;
1383 spin_lock(&inode
->i_lock
);
1384 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1388 if (nfs4_stateid_match_other(&state
->stateid
, stateid
) &&
1389 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1393 if (nfs_state_lock_state_matches_stateid(state
, stateid
) &&
1394 nfs4_state_mark_reclaim_nograce(clp
, state
))
1397 spin_unlock(&inode
->i_lock
);
1399 nfs_inode_find_delegation_state_and_recover(inode
, stateid
);
1401 nfs4_schedule_state_manager(clp
);
1404 static void nfs4_state_mark_open_context_bad(struct nfs4_state
*state
)
1406 struct inode
*inode
= state
->inode
;
1407 struct nfs_inode
*nfsi
= NFS_I(inode
);
1408 struct nfs_open_context
*ctx
;
1410 spin_lock(&inode
->i_lock
);
1411 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1412 if (ctx
->state
!= state
)
1414 set_bit(NFS_CONTEXT_BAD
, &ctx
->flags
);
1416 spin_unlock(&inode
->i_lock
);
1419 static void nfs4_state_mark_recovery_failed(struct nfs4_state
*state
, int error
)
1421 set_bit(NFS_STATE_RECOVERY_FAILED
, &state
->flags
);
1422 nfs4_state_mark_open_context_bad(state
);
1426 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1428 struct inode
*inode
= state
->inode
;
1429 struct nfs_inode
*nfsi
= NFS_I(inode
);
1430 struct file_lock
*fl
;
1432 struct file_lock_context
*flctx
= inode
->i_flctx
;
1433 struct list_head
*list
;
1438 list
= &flctx
->flc_posix
;
1440 /* Guard against delegation returns and new lock/unlock calls */
1441 down_write(&nfsi
->rwsem
);
1442 spin_lock(&flctx
->flc_lock
);
1444 list_for_each_entry(fl
, list
, fl_list
) {
1445 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1447 spin_unlock(&flctx
->flc_lock
);
1448 status
= ops
->recover_lock(state
, fl
);
1453 case -NFS4ERR_ADMIN_REVOKED
:
1454 case -NFS4ERR_STALE_STATEID
:
1455 case -NFS4ERR_BAD_STATEID
:
1456 case -NFS4ERR_EXPIRED
:
1457 case -NFS4ERR_NO_GRACE
:
1458 case -NFS4ERR_STALE_CLIENTID
:
1459 case -NFS4ERR_BADSESSION
:
1460 case -NFS4ERR_BADSLOT
:
1461 case -NFS4ERR_BAD_HIGH_SLOT
:
1462 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1465 pr_err("NFS: %s: unhandled error %d\n",
1468 case -NFS4ERR_DENIED
:
1469 case -NFS4ERR_RECLAIM_BAD
:
1470 case -NFS4ERR_RECLAIM_CONFLICT
:
1471 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1474 spin_lock(&flctx
->flc_lock
);
1476 if (list
== &flctx
->flc_posix
) {
1477 list
= &flctx
->flc_flock
;
1480 spin_unlock(&flctx
->flc_lock
);
1482 up_write(&nfsi
->rwsem
);
1486 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1488 struct nfs4_state
*state
;
1489 struct nfs4_lock_state
*lock
;
1492 /* Note: we rely on the sp->so_states list being ordered
1493 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1495 * This is needed to ensure that the server won't give us any
1496 * read delegations that we have to return if, say, we are
1497 * recovering after a network partition or a reboot from a
1498 * server that doesn't support a grace period.
1500 spin_lock(&sp
->so_lock
);
1501 raw_write_seqcount_begin(&sp
->so_reclaim_seqcount
);
1503 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1504 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1506 if (!nfs4_valid_open_stateid(state
))
1508 if (state
->state
== 0)
1510 atomic_inc(&state
->count
);
1511 spin_unlock(&sp
->so_lock
);
1512 status
= ops
->recover_open(sp
, state
);
1514 status
= nfs4_reclaim_locks(state
, ops
);
1516 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
)) {
1517 spin_lock(&state
->state_lock
);
1518 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1519 if (!test_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
))
1520 pr_warn_ratelimited("NFS: "
1522 "failed!\n", __func__
);
1524 spin_unlock(&state
->state_lock
);
1526 clear_bit(NFS_STATE_RECLAIM_NOGRACE
,
1528 nfs4_put_open_state(state
);
1529 spin_lock(&sp
->so_lock
);
1535 printk(KERN_ERR
"NFS: %s: unhandled error %d\n",
1543 /* Open state on this file cannot be recovered */
1544 nfs4_state_mark_recovery_failed(state
, status
);
1548 case -NFS4ERR_ADMIN_REVOKED
:
1549 case -NFS4ERR_STALE_STATEID
:
1550 case -NFS4ERR_BAD_STATEID
:
1551 case -NFS4ERR_RECLAIM_BAD
:
1552 case -NFS4ERR_RECLAIM_CONFLICT
:
1553 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1555 case -NFS4ERR_EXPIRED
:
1556 case -NFS4ERR_NO_GRACE
:
1557 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1558 case -NFS4ERR_STALE_CLIENTID
:
1559 case -NFS4ERR_BADSESSION
:
1560 case -NFS4ERR_BADSLOT
:
1561 case -NFS4ERR_BAD_HIGH_SLOT
:
1562 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1565 nfs4_put_open_state(state
);
1566 spin_lock(&sp
->so_lock
);
1569 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1570 spin_unlock(&sp
->so_lock
);
1573 nfs4_put_open_state(state
);
1574 spin_lock(&sp
->so_lock
);
1575 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1576 spin_unlock(&sp
->so_lock
);
1580 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1582 struct nfs4_lock_state
*lock
;
1584 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1585 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1586 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1587 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1588 spin_lock(&state
->state_lock
);
1589 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1590 lock
->ls_seqid
.flags
= 0;
1591 clear_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
);
1593 spin_unlock(&state
->state_lock
);
1596 static void nfs4_reset_seqids(struct nfs_server
*server
,
1597 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1599 struct nfs_client
*clp
= server
->nfs_client
;
1600 struct nfs4_state_owner
*sp
;
1601 struct rb_node
*pos
;
1602 struct nfs4_state
*state
;
1604 spin_lock(&clp
->cl_lock
);
1605 for (pos
= rb_first(&server
->state_owners
);
1607 pos
= rb_next(pos
)) {
1608 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1609 sp
->so_seqid
.flags
= 0;
1610 spin_lock(&sp
->so_lock
);
1611 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1612 if (mark_reclaim(clp
, state
))
1613 nfs4_clear_open_state(state
);
1615 spin_unlock(&sp
->so_lock
);
1617 spin_unlock(&clp
->cl_lock
);
1620 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1621 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1623 struct nfs_server
*server
;
1626 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1627 nfs4_reset_seqids(server
, mark_reclaim
);
1631 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1633 /* Mark all delegations for reclaim */
1634 nfs_delegation_mark_reclaim(clp
);
1635 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1638 static void nfs4_reclaim_complete(struct nfs_client
*clp
,
1639 const struct nfs4_state_recovery_ops
*ops
,
1640 struct rpc_cred
*cred
)
1642 /* Notify the server we're done reclaiming our state */
1643 if (ops
->reclaim_complete
)
1644 (void)ops
->reclaim_complete(clp
, cred
);
1647 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1649 struct nfs_client
*clp
= server
->nfs_client
;
1650 struct nfs4_state_owner
*sp
;
1651 struct rb_node
*pos
;
1652 struct nfs4_state
*state
;
1654 spin_lock(&clp
->cl_lock
);
1655 for (pos
= rb_first(&server
->state_owners
);
1657 pos
= rb_next(pos
)) {
1658 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1659 spin_lock(&sp
->so_lock
);
1660 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1661 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1664 nfs4_state_mark_reclaim_nograce(clp
, state
);
1666 spin_unlock(&sp
->so_lock
);
1668 spin_unlock(&clp
->cl_lock
);
1671 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1673 struct nfs_server
*server
;
1675 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1679 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1680 nfs4_clear_reclaim_server(server
);
1683 nfs_delegation_reap_unclaimed(clp
);
1687 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1689 const struct nfs4_state_recovery_ops
*ops
;
1690 struct rpc_cred
*cred
;
1692 if (!nfs4_state_clear_reclaim_reboot(clp
))
1694 ops
= clp
->cl_mvops
->reboot_recovery_ops
;
1695 cred
= nfs4_get_clid_cred(clp
);
1696 nfs4_reclaim_complete(clp
, ops
, cred
);
1700 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1702 nfs_mark_test_expired_all_delegations(clp
);
1703 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1706 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1711 case -NFS4ERR_CB_PATH_DOWN
:
1712 nfs40_handle_cb_pathdown(clp
);
1714 case -NFS4ERR_NO_GRACE
:
1715 nfs4_state_end_reclaim_reboot(clp
);
1717 case -NFS4ERR_STALE_CLIENTID
:
1718 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1719 nfs4_state_clear_reclaim_reboot(clp
);
1720 nfs4_state_start_reclaim_reboot(clp
);
1722 case -NFS4ERR_EXPIRED
:
1723 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1724 nfs4_state_start_reclaim_nograce(clp
);
1726 case -NFS4ERR_BADSESSION
:
1727 case -NFS4ERR_BADSLOT
:
1728 case -NFS4ERR_BAD_HIGH_SLOT
:
1729 case -NFS4ERR_DEADSESSION
:
1730 case -NFS4ERR_SEQ_FALSE_RETRY
:
1731 case -NFS4ERR_SEQ_MISORDERED
:
1732 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1733 /* Zero session reset errors */
1735 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1736 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
1739 dprintk("%s: failed to handle error %d for server %s\n",
1740 __func__
, error
, clp
->cl_hostname
);
1743 dprintk("%s: handled error %d for server %s\n", __func__
, error
,
1748 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1750 struct nfs4_state_owner
*sp
;
1751 struct nfs_server
*server
;
1752 struct rb_node
*pos
;
1757 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1758 nfs4_purge_state_owners(server
);
1759 spin_lock(&clp
->cl_lock
);
1760 for (pos
= rb_first(&server
->state_owners
);
1762 pos
= rb_next(pos
)) {
1764 struct nfs4_state_owner
, so_server_node
);
1765 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1768 if (!atomic_inc_not_zero(&sp
->so_count
))
1770 spin_unlock(&clp
->cl_lock
);
1773 status
= nfs4_reclaim_open_state(sp
, ops
);
1775 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1776 nfs4_put_state_owner(sp
);
1777 status
= nfs4_recovery_handle_error(clp
, status
);
1778 return (status
!= 0) ? status
: -EAGAIN
;
1781 nfs4_put_state_owner(sp
);
1784 spin_unlock(&clp
->cl_lock
);
1790 static int nfs4_check_lease(struct nfs_client
*clp
)
1792 struct rpc_cred
*cred
;
1793 const struct nfs4_state_maintenance_ops
*ops
=
1794 clp
->cl_mvops
->state_renewal_ops
;
1797 /* Is the client already known to have an expired lease? */
1798 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1800 spin_lock(&clp
->cl_lock
);
1801 cred
= ops
->get_state_renewal_cred_locked(clp
);
1802 spin_unlock(&clp
->cl_lock
);
1804 cred
= nfs4_get_clid_cred(clp
);
1809 status
= ops
->renew_lease(clp
, cred
);
1811 if (status
== -ETIMEDOUT
) {
1812 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1816 return nfs4_recovery_handle_error(clp
, status
);
1819 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1820 * and for recoverable errors on EXCHANGE_ID for v4.1
1822 static int nfs4_handle_reclaim_lease_error(struct nfs_client
*clp
, int status
)
1825 case -NFS4ERR_SEQ_MISORDERED
:
1826 if (test_and_set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
))
1827 return -ESERVERFAULT
;
1828 /* Lease confirmation error: retry after purging the lease */
1830 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1832 case -NFS4ERR_STALE_CLIENTID
:
1833 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1834 nfs4_state_start_reclaim_reboot(clp
);
1836 case -NFS4ERR_CLID_INUSE
:
1837 pr_err("NFS: Server %s reports our clientid is in use\n",
1839 nfs_mark_client_ready(clp
, -EPERM
);
1840 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1843 case -NFS4ERR_DELAY
:
1849 case -NFS4ERR_MINOR_VERS_MISMATCH
:
1850 if (clp
->cl_cons_state
== NFS_CS_SESSION_INITING
)
1851 nfs_mark_client_ready(clp
, -EPROTONOSUPPORT
);
1852 dprintk("%s: exit with error %d for server %s\n",
1853 __func__
, -EPROTONOSUPPORT
, clp
->cl_hostname
);
1854 return -EPROTONOSUPPORT
;
1855 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1856 * in nfs4_exchange_id */
1858 dprintk("%s: exit with error %d for server %s\n", __func__
,
1859 status
, clp
->cl_hostname
);
1862 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1863 dprintk("%s: handled error %d for server %s\n", __func__
, status
,
1868 static int nfs4_establish_lease(struct nfs_client
*clp
)
1870 struct rpc_cred
*cred
;
1871 const struct nfs4_state_recovery_ops
*ops
=
1872 clp
->cl_mvops
->reboot_recovery_ops
;
1875 nfs4_begin_drain_session(clp
);
1876 cred
= nfs4_get_clid_cred(clp
);
1879 status
= ops
->establish_clid(clp
, cred
);
1883 pnfs_destroy_all_layouts(clp
);
1888 * Returns zero or a negative errno. NFS4ERR values are converted
1889 * to local errno values.
1891 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1895 status
= nfs4_establish_lease(clp
);
1897 return nfs4_handle_reclaim_lease_error(clp
, status
);
1898 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
, &clp
->cl_state
))
1899 nfs4_state_start_reclaim_nograce(clp
);
1900 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1901 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1902 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1903 clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1907 static int nfs4_purge_lease(struct nfs_client
*clp
)
1911 status
= nfs4_establish_lease(clp
);
1913 return nfs4_handle_reclaim_lease_error(clp
, status
);
1914 clear_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
1915 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1916 nfs4_state_start_reclaim_nograce(clp
);
1921 * Try remote migration of one FSID from a source server to a
1922 * destination server. The source server provides a list of
1923 * potential destinations.
1925 * Returns zero or a negative NFS4ERR status code.
1927 static int nfs4_try_migration(struct nfs_server
*server
, struct rpc_cred
*cred
)
1929 struct nfs_client
*clp
= server
->nfs_client
;
1930 struct nfs4_fs_locations
*locations
= NULL
;
1931 struct inode
*inode
;
1935 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__
,
1936 (unsigned long long)server
->fsid
.major
,
1937 (unsigned long long)server
->fsid
.minor
,
1941 page
= alloc_page(GFP_KERNEL
);
1942 locations
= kmalloc(sizeof(struct nfs4_fs_locations
), GFP_KERNEL
);
1943 if (page
== NULL
|| locations
== NULL
) {
1944 dprintk("<-- %s: no memory\n", __func__
);
1948 inode
= d_inode(server
->super
->s_root
);
1949 result
= nfs4_proc_get_locations(inode
, locations
, page
, cred
);
1951 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1956 result
= -NFS4ERR_NXIO
;
1957 if (!(locations
->fattr
.valid
& NFS_ATTR_FATTR_V4_LOCATIONS
)) {
1958 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1963 nfs4_begin_drain_session(clp
);
1965 status
= nfs4_replace_transport(server
, locations
);
1967 dprintk("<-- %s: failed to replace transport: %d\n",
1973 dprintk("<-- %s: migration succeeded\n", __func__
);
1980 pr_err("NFS: migration recovery failed (server %s)\n",
1982 set_bit(NFS_MIG_FAILED
, &server
->mig_status
);
1988 * Returns zero or a negative NFS4ERR status code.
1990 static int nfs4_handle_migration(struct nfs_client
*clp
)
1992 const struct nfs4_state_maintenance_ops
*ops
=
1993 clp
->cl_mvops
->state_renewal_ops
;
1994 struct nfs_server
*server
;
1995 struct rpc_cred
*cred
;
1997 dprintk("%s: migration reported on \"%s\"\n", __func__
,
2000 spin_lock(&clp
->cl_lock
);
2001 cred
= ops
->get_state_renewal_cred_locked(clp
);
2002 spin_unlock(&clp
->cl_lock
);
2004 return -NFS4ERR_NOENT
;
2009 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2012 if (server
->mig_gen
== clp
->cl_mig_gen
)
2014 server
->mig_gen
= clp
->cl_mig_gen
;
2016 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION
,
2017 &server
->mig_status
))
2021 status
= nfs4_try_migration(server
, cred
);
2034 * Test each nfs_server on the clp's cl_superblocks list to see
2035 * if it's moved to another server. Stop when the server no longer
2036 * returns NFS4ERR_LEASE_MOVED.
2038 static int nfs4_handle_lease_moved(struct nfs_client
*clp
)
2040 const struct nfs4_state_maintenance_ops
*ops
=
2041 clp
->cl_mvops
->state_renewal_ops
;
2042 struct nfs_server
*server
;
2043 struct rpc_cred
*cred
;
2045 dprintk("%s: lease moved reported on \"%s\"\n", __func__
,
2048 spin_lock(&clp
->cl_lock
);
2049 cred
= ops
->get_state_renewal_cred_locked(clp
);
2050 spin_unlock(&clp
->cl_lock
);
2052 return -NFS4ERR_NOENT
;
2057 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2058 struct inode
*inode
;
2061 if (server
->mig_gen
== clp
->cl_mig_gen
)
2063 server
->mig_gen
= clp
->cl_mig_gen
;
2067 inode
= d_inode(server
->super
->s_root
);
2068 status
= nfs4_proc_fsid_present(inode
, cred
);
2069 if (status
!= -NFS4ERR_MOVED
)
2070 goto restart
; /* wasn't this one */
2071 if (nfs4_try_migration(server
, cred
) == -NFS4ERR_LEASE_MOVED
)
2072 goto restart
; /* there are more */
2083 * nfs4_discover_server_trunking - Detect server IP address trunking
2085 * @clp: nfs_client under test
2086 * @result: OUT: found nfs_client, or clp
2088 * Returns zero or a negative errno. If zero is returned,
2089 * an nfs_client pointer is planted in "result".
2091 * Note: since we are invoked in process context, and
2092 * not from inside the state manager, we cannot use
2093 * nfs4_handle_reclaim_lease_error().
2095 int nfs4_discover_server_trunking(struct nfs_client
*clp
,
2096 struct nfs_client
**result
)
2098 const struct nfs4_state_recovery_ops
*ops
=
2099 clp
->cl_mvops
->reboot_recovery_ops
;
2100 struct rpc_clnt
*clnt
;
2101 struct rpc_cred
*cred
;
2104 dprintk("NFS: %s: testing '%s'\n", __func__
, clp
->cl_hostname
);
2106 clnt
= clp
->cl_rpcclient
;
2109 mutex_lock(&nfs_clid_init_mutex
);
2112 cred
= nfs4_get_clid_cred(clp
);
2116 status
= ops
->detect_trunking(clp
, result
, cred
);
2122 if (clnt
->cl_softrtry
)
2124 case -NFS4ERR_DELAY
:
2127 case -NFS4ERR_STALE_CLIENTID
:
2128 dprintk("NFS: %s after status %d, retrying\n",
2133 nfs4_root_machine_cred(clp
);
2136 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
)
2138 case -NFS4ERR_CLID_INUSE
:
2139 case -NFS4ERR_WRONGSEC
:
2140 /* No point in retrying if we already used RPC_AUTH_UNIX */
2141 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
) {
2145 clnt
= rpc_clone_client_set_auth(clnt
, RPC_AUTH_UNIX
);
2147 status
= PTR_ERR(clnt
);
2150 /* Note: this is safe because we haven't yet marked the
2151 * client as ready, so we are the only user of
2154 clnt
= xchg(&clp
->cl_rpcclient
, clnt
);
2155 rpc_shutdown_client(clnt
);
2156 clnt
= clp
->cl_rpcclient
;
2159 case -NFS4ERR_MINOR_VERS_MISMATCH
:
2160 status
= -EPROTONOSUPPORT
;
2164 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
2165 * in nfs4_exchange_id */
2166 status
= -EKEYEXPIRED
;
2169 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2175 mutex_unlock(&nfs_clid_init_mutex
);
2176 dprintk("NFS: %s: status = %d\n", __func__
, status
);
2180 #ifdef CONFIG_NFS_V4_1
2181 void nfs4_schedule_session_recovery(struct nfs4_session
*session
, int err
)
2183 struct nfs_client
*clp
= session
->clp
;
2187 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2189 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
2190 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2192 nfs4_schedule_lease_recovery(clp
);
2194 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
2196 void nfs41_notify_server(struct nfs_client
*clp
)
2198 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2199 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2200 nfs4_schedule_state_manager(clp
);
2203 static void nfs4_reset_all_state(struct nfs_client
*clp
)
2205 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2206 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2207 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
2208 nfs4_state_start_reclaim_nograce(clp
);
2209 dprintk("%s: scheduling reset of all state for server %s!\n",
2210 __func__
, clp
->cl_hostname
);
2211 nfs4_schedule_state_manager(clp
);
2215 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
2217 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2218 nfs4_state_start_reclaim_reboot(clp
);
2219 dprintk("%s: server %s rebooted!\n", __func__
,
2221 nfs4_schedule_state_manager(clp
);
2225 static void nfs41_handle_all_state_revoked(struct nfs_client
*clp
)
2227 nfs4_reset_all_state(clp
);
2228 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2231 static void nfs41_handle_some_state_revoked(struct nfs_client
*clp
)
2233 nfs4_state_start_reclaim_nograce(clp
);
2234 nfs4_schedule_state_manager(clp
);
2236 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2239 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
2241 /* FIXME: For now, we destroy all layouts. */
2242 pnfs_destroy_all_layouts(clp
);
2243 /* FIXME: For now, we test all delegations+open state+locks. */
2244 nfs41_handle_some_state_revoked(clp
);
2245 dprintk("%s: Recallable state revoked on server %s!\n", __func__
,
2249 static void nfs41_handle_backchannel_fault(struct nfs_client
*clp
)
2251 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2252 nfs4_schedule_state_manager(clp
);
2254 dprintk("%s: server %s declared a backchannel fault\n", __func__
,
2258 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
2260 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2261 &clp
->cl_state
) == 0)
2262 nfs4_schedule_state_manager(clp
);
2265 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
,
2271 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2272 __func__
, clp
->cl_hostname
, clp
->cl_clientid
, flags
);
2274 * If we're called from the state manager thread, then assume we're
2275 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2276 * Those flags are expected to remain set until we're done
2277 * recovering (see RFC5661, section 18.46.3).
2282 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
2283 nfs41_handle_server_reboot(clp
);
2284 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
))
2285 nfs41_handle_all_state_revoked(clp
);
2286 if (flags
& (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
2287 SEQ4_STATUS_ADMIN_STATE_REVOKED
))
2288 nfs41_handle_some_state_revoked(clp
);
2289 if (flags
& SEQ4_STATUS_LEASE_MOVED
)
2290 nfs4_schedule_lease_moved_recovery(clp
);
2291 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
2292 nfs41_handle_recallable_state_revoked(clp
);
2294 if (flags
& SEQ4_STATUS_BACKCHANNEL_FAULT
)
2295 nfs41_handle_backchannel_fault(clp
);
2296 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
2297 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
2298 nfs41_handle_cb_path_down(clp
);
2301 static int nfs4_reset_session(struct nfs_client
*clp
)
2303 struct rpc_cred
*cred
;
2306 if (!nfs4_has_session(clp
))
2308 nfs4_begin_drain_session(clp
);
2309 cred
= nfs4_get_clid_cred(clp
);
2310 status
= nfs4_proc_destroy_session(clp
->cl_session
, cred
);
2313 case -NFS4ERR_BADSESSION
:
2314 case -NFS4ERR_DEADSESSION
:
2316 case -NFS4ERR_BACK_CHAN_BUSY
:
2317 case -NFS4ERR_DELAY
:
2318 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2323 status
= nfs4_recovery_handle_error(clp
, status
);
2327 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
2328 status
= nfs4_proc_create_session(clp
, cred
);
2330 dprintk("%s: session reset failed with status %d for server %s!\n",
2331 __func__
, status
, clp
->cl_hostname
);
2332 status
= nfs4_handle_reclaim_lease_error(clp
, status
);
2335 nfs41_finish_session_reset(clp
);
2336 dprintk("%s: session reset was successful for server %s!\n",
2337 __func__
, clp
->cl_hostname
);
2344 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2346 struct rpc_cred
*cred
;
2349 if (!nfs4_has_session(clp
))
2351 nfs4_begin_drain_session(clp
);
2352 cred
= nfs4_get_clid_cred(clp
);
2353 ret
= nfs4_proc_bind_conn_to_session(clp
, cred
);
2356 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2359 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2360 __func__
, clp
->cl_hostname
);
2362 case -NFS4ERR_DELAY
:
2364 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2367 return nfs4_recovery_handle_error(clp
, ret
);
2371 #else /* CONFIG_NFS_V4_1 */
2372 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
2374 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2378 #endif /* CONFIG_NFS_V4_1 */
2380 static void nfs4_state_manager(struct nfs_client
*clp
)
2383 const char *section
= "", *section_sep
= "";
2385 /* Ensure exclusive access to NFSv4 state */
2387 if (test_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
)) {
2388 section
= "purge state";
2389 status
= nfs4_purge_lease(clp
);
2395 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
2396 section
= "lease expired";
2397 /* We're going to have to re-establish a clientid */
2398 status
= nfs4_reclaim_lease(clp
);
2404 /* Initialize or reset the session */
2405 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)) {
2406 section
= "reset session";
2407 status
= nfs4_reset_session(clp
);
2408 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
2414 /* Send BIND_CONN_TO_SESSION */
2415 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2417 section
= "bind conn to session";
2418 status
= nfs4_bind_conn_to_session(clp
);
2424 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
2425 section
= "check lease";
2426 status
= nfs4_check_lease(clp
);
2432 if (test_and_clear_bit(NFS4CLNT_MOVED
, &clp
->cl_state
)) {
2433 section
= "migration";
2434 status
= nfs4_handle_migration(clp
);
2439 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
)) {
2440 section
= "lease moved";
2441 status
= nfs4_handle_lease_moved(clp
);
2446 /* First recover reboot state... */
2447 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
2448 section
= "reclaim reboot";
2449 status
= nfs4_do_reclaim(clp
,
2450 clp
->cl_mvops
->reboot_recovery_ops
);
2451 if (status
== -EAGAIN
)
2455 nfs4_state_end_reclaim_reboot(clp
);
2458 /* Detect expired delegations... */
2459 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED
, &clp
->cl_state
)) {
2460 section
= "detect expired delegations";
2461 nfs_reap_expired_delegations(clp
);
2465 /* Now recover expired state... */
2466 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
2467 section
= "reclaim nograce";
2468 status
= nfs4_do_reclaim(clp
,
2469 clp
->cl_mvops
->nograce_recovery_ops
);
2470 if (status
== -EAGAIN
)
2476 nfs4_end_drain_session(clp
);
2477 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
2478 nfs_client_return_marked_delegations(clp
);
2482 nfs4_clear_state_manager_bit(clp
);
2483 /* Did we race with an attempt to give us more work? */
2484 if (clp
->cl_state
== 0)
2486 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
2488 } while (atomic_read(&clp
->cl_count
) > 1);
2491 if (strlen(section
))
2493 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2494 " with error %d\n", section_sep
, section
,
2495 clp
->cl_hostname
, -status
);
2497 nfs4_end_drain_session(clp
);
2498 nfs4_clear_state_manager_bit(clp
);
2501 static int nfs4_run_state_manager(void *ptr
)
2503 struct nfs_client
*clp
= ptr
;
2505 allow_signal(SIGKILL
);
2506 nfs4_state_manager(clp
);
2507 nfs_put_client(clp
);
2508 module_put_and_exit(0);