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
);
356 * Purge state if the client id was established in a prior
357 * instance and the client id could not have arrived on the
358 * server via Transparent State Migration.
360 if (clp
->cl_exchange_flags
& EXCHGID4_FLAG_CONFIRMED_R
) {
361 if (!test_bit(NFS_CS_TSM_POSSIBLE
, &clp
->cl_flags
))
362 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
364 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
366 nfs4_schedule_state_manager(clp
);
367 status
= nfs_wait_client_init_complete(clp
);
373 #endif /* CONFIG_NFS_V4_1 */
376 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
377 * @clp: client state handle
379 * Returns an rpc_cred with reference count bumped, or NULL.
381 struct rpc_cred
*nfs4_get_clid_cred(struct nfs_client
*clp
)
383 struct rpc_cred
*cred
;
385 spin_lock(&clp
->cl_lock
);
386 cred
= nfs4_get_machine_cred_locked(clp
);
387 spin_unlock(&clp
->cl_lock
);
391 static struct nfs4_state_owner
*
392 nfs4_find_state_owner_locked(struct nfs_server
*server
, struct rpc_cred
*cred
)
394 struct rb_node
**p
= &server
->state_owners
.rb_node
,
396 struct nfs4_state_owner
*sp
;
400 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
402 if (cred
< sp
->so_cred
)
403 p
= &parent
->rb_left
;
404 else if (cred
> sp
->so_cred
)
405 p
= &parent
->rb_right
;
407 if (!list_empty(&sp
->so_lru
))
408 list_del_init(&sp
->so_lru
);
409 atomic_inc(&sp
->so_count
);
416 static struct nfs4_state_owner
*
417 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
419 struct nfs_server
*server
= new->so_server
;
420 struct rb_node
**p
= &server
->state_owners
.rb_node
,
422 struct nfs4_state_owner
*sp
;
427 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
429 if (new->so_cred
< sp
->so_cred
)
430 p
= &parent
->rb_left
;
431 else if (new->so_cred
> sp
->so_cred
)
432 p
= &parent
->rb_right
;
434 if (!list_empty(&sp
->so_lru
))
435 list_del_init(&sp
->so_lru
);
436 atomic_inc(&sp
->so_count
);
440 err
= ida_get_new(&server
->openowner_id
, &new->so_seqid
.owner_id
);
443 rb_link_node(&new->so_server_node
, parent
, p
);
444 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
449 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
451 struct nfs_server
*server
= sp
->so_server
;
453 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
454 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
455 ida_remove(&server
->openowner_id
, sp
->so_seqid
.owner_id
);
459 nfs4_init_seqid_counter(struct nfs_seqid_counter
*sc
)
461 sc
->create_time
= ktime_get();
464 spin_lock_init(&sc
->lock
);
465 INIT_LIST_HEAD(&sc
->list
);
466 rpc_init_wait_queue(&sc
->wait
, "Seqid_waitqueue");
470 nfs4_destroy_seqid_counter(struct nfs_seqid_counter
*sc
)
472 rpc_destroy_wait_queue(&sc
->wait
);
476 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
477 * create a new state_owner.
480 static struct nfs4_state_owner
*
481 nfs4_alloc_state_owner(struct nfs_server
*server
,
482 struct rpc_cred
*cred
,
485 struct nfs4_state_owner
*sp
;
487 sp
= kzalloc(sizeof(*sp
), gfp_flags
);
490 sp
->so_server
= server
;
491 sp
->so_cred
= get_rpccred(cred
);
492 spin_lock_init(&sp
->so_lock
);
493 INIT_LIST_HEAD(&sp
->so_states
);
494 nfs4_init_seqid_counter(&sp
->so_seqid
);
495 atomic_set(&sp
->so_count
, 1);
496 INIT_LIST_HEAD(&sp
->so_lru
);
497 seqcount_init(&sp
->so_reclaim_seqcount
);
498 mutex_init(&sp
->so_delegreturn_mutex
);
503 nfs4_reset_state_owner(struct nfs4_state_owner
*sp
)
505 /* This state_owner is no longer usable, but must
506 * remain in place so that state recovery can find it
507 * and the opens associated with it.
508 * It may also be used for new 'open' request to
509 * return a delegation to the server.
510 * So update the 'create_time' so that it looks like
511 * a new state_owner. This will cause the server to
512 * request an OPEN_CONFIRM to start a new sequence.
514 sp
->so_seqid
.create_time
= ktime_get();
517 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
519 nfs4_destroy_seqid_counter(&sp
->so_seqid
);
520 put_rpccred(sp
->so_cred
);
524 static void nfs4_gc_state_owners(struct nfs_server
*server
)
526 struct nfs_client
*clp
= server
->nfs_client
;
527 struct nfs4_state_owner
*sp
, *tmp
;
528 unsigned long time_min
, time_max
;
531 spin_lock(&clp
->cl_lock
);
533 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
534 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
535 /* NB: LRU is sorted so that oldest is at the head */
536 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
538 list_move(&sp
->so_lru
, &doomed
);
539 nfs4_remove_state_owner_locked(sp
);
541 spin_unlock(&clp
->cl_lock
);
543 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
544 list_del(&sp
->so_lru
);
545 nfs4_free_state_owner(sp
);
550 * nfs4_get_state_owner - Look up a state owner given a credential
551 * @server: nfs_server to search
552 * @cred: RPC credential to match
554 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
556 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
557 struct rpc_cred
*cred
,
560 struct nfs_client
*clp
= server
->nfs_client
;
561 struct nfs4_state_owner
*sp
, *new;
563 spin_lock(&clp
->cl_lock
);
564 sp
= nfs4_find_state_owner_locked(server
, cred
);
565 spin_unlock(&clp
->cl_lock
);
568 new = nfs4_alloc_state_owner(server
, cred
, gfp_flags
);
572 if (ida_pre_get(&server
->openowner_id
, gfp_flags
) == 0)
574 spin_lock(&clp
->cl_lock
);
575 sp
= nfs4_insert_state_owner_locked(new);
576 spin_unlock(&clp
->cl_lock
);
577 } while (sp
== ERR_PTR(-EAGAIN
));
579 nfs4_free_state_owner(new);
581 nfs4_gc_state_owners(server
);
586 * nfs4_put_state_owner - Release a nfs4_state_owner
587 * @sp: state owner data to release
589 * Note that we keep released state owners on an LRU
591 * This caches valid state owners so that they can be
592 * reused, to avoid the OPEN_CONFIRM on minor version 0.
593 * It also pins the uniquifier of dropped state owners for
594 * a while, to ensure that those state owner names are
597 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
599 struct nfs_server
*server
= sp
->so_server
;
600 struct nfs_client
*clp
= server
->nfs_client
;
602 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
605 sp
->so_expires
= jiffies
;
606 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
607 spin_unlock(&clp
->cl_lock
);
611 * nfs4_purge_state_owners - Release all cached state owners
612 * @server: nfs_server with cached state owners to release
614 * Called at umount time. Remaining state owners will be on
615 * the LRU with ref count of zero.
617 void nfs4_purge_state_owners(struct nfs_server
*server
)
619 struct nfs_client
*clp
= server
->nfs_client
;
620 struct nfs4_state_owner
*sp
, *tmp
;
623 spin_lock(&clp
->cl_lock
);
624 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
625 list_move(&sp
->so_lru
, &doomed
);
626 nfs4_remove_state_owner_locked(sp
);
628 spin_unlock(&clp
->cl_lock
);
630 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
631 list_del(&sp
->so_lru
);
632 nfs4_free_state_owner(sp
);
636 static struct nfs4_state
*
637 nfs4_alloc_open_state(void)
639 struct nfs4_state
*state
;
641 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
644 atomic_set(&state
->count
, 1);
645 INIT_LIST_HEAD(&state
->lock_states
);
646 spin_lock_init(&state
->state_lock
);
647 seqlock_init(&state
->seqlock
);
652 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
654 if (state
->state
== fmode
)
656 /* NB! List reordering - see the reclaim code for why. */
657 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
658 if (fmode
& FMODE_WRITE
)
659 list_move(&state
->open_states
, &state
->owner
->so_states
);
661 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
663 state
->state
= fmode
;
666 static struct nfs4_state
*
667 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
669 struct nfs_inode
*nfsi
= NFS_I(inode
);
670 struct nfs4_state
*state
;
672 list_for_each_entry(state
, &nfsi
->open_states
, inode_states
) {
673 if (state
->owner
!= owner
)
675 if (!nfs4_valid_open_stateid(state
))
677 if (atomic_inc_not_zero(&state
->count
))
684 nfs4_free_open_state(struct nfs4_state
*state
)
690 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
692 struct nfs4_state
*state
, *new;
693 struct nfs_inode
*nfsi
= NFS_I(inode
);
695 spin_lock(&inode
->i_lock
);
696 state
= __nfs4_find_state_byowner(inode
, owner
);
697 spin_unlock(&inode
->i_lock
);
700 new = nfs4_alloc_open_state();
701 spin_lock(&owner
->so_lock
);
702 spin_lock(&inode
->i_lock
);
703 state
= __nfs4_find_state_byowner(inode
, owner
);
704 if (state
== NULL
&& new != NULL
) {
706 state
->owner
= owner
;
707 atomic_inc(&owner
->so_count
);
708 list_add(&state
->inode_states
, &nfsi
->open_states
);
710 state
->inode
= inode
;
711 spin_unlock(&inode
->i_lock
);
712 /* Note: The reclaim code dictates that we add stateless
713 * and read-only stateids to the end of the list */
714 list_add_tail(&state
->open_states
, &owner
->so_states
);
715 spin_unlock(&owner
->so_lock
);
717 spin_unlock(&inode
->i_lock
);
718 spin_unlock(&owner
->so_lock
);
720 nfs4_free_open_state(new);
726 void nfs4_put_open_state(struct nfs4_state
*state
)
728 struct inode
*inode
= state
->inode
;
729 struct nfs4_state_owner
*owner
= state
->owner
;
731 if (!atomic_dec_and_lock(&state
->count
, &owner
->so_lock
))
733 spin_lock(&inode
->i_lock
);
734 list_del(&state
->inode_states
);
735 list_del(&state
->open_states
);
736 spin_unlock(&inode
->i_lock
);
737 spin_unlock(&owner
->so_lock
);
739 nfs4_free_open_state(state
);
740 nfs4_put_state_owner(owner
);
744 * Close the current file.
746 static void __nfs4_close(struct nfs4_state
*state
,
747 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
749 struct nfs4_state_owner
*owner
= state
->owner
;
753 atomic_inc(&owner
->so_count
);
754 /* Protect against nfs4_find_state() */
755 spin_lock(&owner
->so_lock
);
756 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
763 case FMODE_READ
|FMODE_WRITE
:
766 newstate
= FMODE_READ
|FMODE_WRITE
;
767 if (state
->n_rdwr
== 0) {
768 if (state
->n_rdonly
== 0) {
769 newstate
&= ~FMODE_READ
;
770 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
771 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
773 if (state
->n_wronly
== 0) {
774 newstate
&= ~FMODE_WRITE
;
775 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
776 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
779 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
781 nfs4_state_set_mode_locked(state
, newstate
);
782 spin_unlock(&owner
->so_lock
);
785 nfs4_put_open_state(state
);
786 nfs4_put_state_owner(owner
);
788 nfs4_do_close(state
, gfp_mask
, wait
);
791 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
793 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
796 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
798 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
802 * Search the state->lock_states for an existing lock_owner
803 * that is compatible with either of the given owners.
804 * If the second is non-zero, then the first refers to a Posix-lock
805 * owner (current->files) and the second refers to a flock/OFD
806 * owner (struct file*). In that case, prefer a match for the first
808 * If both sorts of locks are held on the one file we cannot know
809 * which stateid was intended to be used, so a "correct" choice cannot
810 * be made. Failing that, a "consistent" choice is preferable. The
811 * consistent choice we make is to prefer the first owner, that of a
814 static struct nfs4_lock_state
*
815 __nfs4_find_lock_state(struct nfs4_state
*state
,
816 fl_owner_t fl_owner
, fl_owner_t fl_owner2
)
818 struct nfs4_lock_state
*pos
, *ret
= NULL
;
819 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
820 if (pos
->ls_owner
== fl_owner
) {
824 if (pos
->ls_owner
== fl_owner2
)
828 atomic_inc(&ret
->ls_count
);
833 * Return a compatible lock_state. If no initialized lock_state structure
834 * exists, return an uninitialized one.
837 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
839 struct nfs4_lock_state
*lsp
;
840 struct nfs_server
*server
= state
->owner
->so_server
;
842 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
845 nfs4_init_seqid_counter(&lsp
->ls_seqid
);
846 atomic_set(&lsp
->ls_count
, 1);
847 lsp
->ls_state
= state
;
848 lsp
->ls_owner
= fl_owner
;
849 lsp
->ls_seqid
.owner_id
= ida_simple_get(&server
->lockowner_id
, 0, 0, GFP_NOFS
);
850 if (lsp
->ls_seqid
.owner_id
< 0)
852 INIT_LIST_HEAD(&lsp
->ls_locks
);
859 void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
)
861 ida_simple_remove(&server
->lockowner_id
, lsp
->ls_seqid
.owner_id
);
862 nfs4_destroy_seqid_counter(&lsp
->ls_seqid
);
867 * Return a compatible lock_state. If no initialized lock_state structure
868 * exists, return an uninitialized one.
871 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
873 struct nfs4_lock_state
*lsp
, *new = NULL
;
876 spin_lock(&state
->state_lock
);
877 lsp
= __nfs4_find_lock_state(state
, owner
, NULL
);
881 list_add(&new->ls_locks
, &state
->lock_states
);
882 set_bit(LK_STATE_IN_USE
, &state
->flags
);
887 spin_unlock(&state
->state_lock
);
888 new = nfs4_alloc_lock_state(state
, owner
);
892 spin_unlock(&state
->state_lock
);
894 nfs4_free_lock_state(state
->owner
->so_server
, new);
899 * Release reference to lock_state, and free it if we see that
900 * it is no longer in use
902 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
904 struct nfs_server
*server
;
905 struct nfs4_state
*state
;
909 state
= lsp
->ls_state
;
910 if (!atomic_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
912 list_del(&lsp
->ls_locks
);
913 if (list_empty(&state
->lock_states
))
914 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
915 spin_unlock(&state
->state_lock
);
916 server
= state
->owner
->so_server
;
917 if (test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
)) {
918 struct nfs_client
*clp
= server
->nfs_client
;
920 clp
->cl_mvops
->free_lock_state(server
, lsp
);
922 nfs4_free_lock_state(server
, lsp
);
925 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
927 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
929 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
930 atomic_inc(&lsp
->ls_count
);
933 static void nfs4_fl_release_lock(struct file_lock
*fl
)
935 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
938 static const struct file_lock_operations nfs4_fl_lock_ops
= {
939 .fl_copy_lock
= nfs4_fl_copy_lock
,
940 .fl_release_private
= nfs4_fl_release_lock
,
943 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
945 struct nfs4_lock_state
*lsp
;
947 if (fl
->fl_ops
!= NULL
)
949 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
952 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
953 fl
->fl_ops
= &nfs4_fl_lock_ops
;
957 static int nfs4_copy_lock_stateid(nfs4_stateid
*dst
,
958 struct nfs4_state
*state
,
959 const struct nfs_lock_context
*l_ctx
)
961 struct nfs4_lock_state
*lsp
;
962 fl_owner_t fl_owner
, fl_flock_owner
;
968 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
971 fl_owner
= l_ctx
->lockowner
;
972 fl_flock_owner
= l_ctx
->open_context
->flock_owner
;
974 spin_lock(&state
->state_lock
);
975 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_flock_owner
);
976 if (lsp
&& test_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
))
978 else if (lsp
!= NULL
&& test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
) != 0) {
979 nfs4_stateid_copy(dst
, &lsp
->ls_stateid
);
982 spin_unlock(&state
->state_lock
);
983 nfs4_put_lock_state(lsp
);
988 static void nfs4_copy_open_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
)
990 const nfs4_stateid
*src
;
995 seq
= read_seqbegin(&state
->seqlock
);
996 if (test_bit(NFS_OPEN_STATE
, &state
->flags
))
997 src
= &state
->open_stateid
;
998 nfs4_stateid_copy(dst
, src
);
999 } while (read_seqretry(&state
->seqlock
, seq
));
1003 * Byte-range lock aware utility to initialize the stateid of read/write
1006 int nfs4_select_rw_stateid(struct nfs4_state
*state
,
1007 fmode_t fmode
, const struct nfs_lock_context
*l_ctx
,
1008 nfs4_stateid
*dst
, struct rpc_cred
**cred
)
1012 if (!nfs4_valid_open_stateid(state
))
1016 ret
= nfs4_copy_lock_stateid(dst
, state
, l_ctx
);
1018 /* A lost lock - don't even consider delegations */
1020 /* returns true if delegation stateid found and copied */
1021 if (nfs4_copy_delegation_stateid(state
->inode
, fmode
, dst
, cred
)) {
1026 /* nfs4_copy_delegation_stateid() didn't over-write
1027 * dst, so it still has the lock stateid which we now
1031 nfs4_copy_open_stateid(dst
, state
);
1034 if (nfs_server_capable(state
->inode
, NFS_CAP_STATEID_NFSV41
))
1039 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
1041 struct nfs_seqid
*new;
1043 new = kmalloc(sizeof(*new), gfp_mask
);
1045 return ERR_PTR(-ENOMEM
);
1046 new->sequence
= counter
;
1047 INIT_LIST_HEAD(&new->list
);
1052 void nfs_release_seqid(struct nfs_seqid
*seqid
)
1054 struct nfs_seqid_counter
*sequence
;
1056 if (seqid
== NULL
|| list_empty(&seqid
->list
))
1058 sequence
= seqid
->sequence
;
1059 spin_lock(&sequence
->lock
);
1060 list_del_init(&seqid
->list
);
1061 if (!list_empty(&sequence
->list
)) {
1062 struct nfs_seqid
*next
;
1064 next
= list_first_entry(&sequence
->list
,
1065 struct nfs_seqid
, list
);
1066 rpc_wake_up_queued_task(&sequence
->wait
, next
->task
);
1068 spin_unlock(&sequence
->lock
);
1071 void nfs_free_seqid(struct nfs_seqid
*seqid
)
1073 nfs_release_seqid(seqid
);
1078 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1079 * failed with a seqid incrementing error -
1080 * see comments nfs4.h:seqid_mutating_error()
1082 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
1087 case -NFS4ERR_BAD_SEQID
:
1088 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
1090 pr_warn_ratelimited("NFS: v4 server returned a bad"
1091 " sequence-id error on an"
1092 " unconfirmed sequence %p!\n",
1094 case -NFS4ERR_STALE_CLIENTID
:
1095 case -NFS4ERR_STALE_STATEID
:
1096 case -NFS4ERR_BAD_STATEID
:
1097 case -NFS4ERR_BADXDR
:
1098 case -NFS4ERR_RESOURCE
:
1099 case -NFS4ERR_NOFILEHANDLE
:
1100 case -NFS4ERR_MOVED
:
1101 /* Non-seqid mutating errors */
1105 * Note: no locking needed as we are guaranteed to be first
1106 * on the sequence list
1108 seqid
->sequence
->counter
++;
1111 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
1113 struct nfs4_state_owner
*sp
;
1118 sp
= container_of(seqid
->sequence
, struct nfs4_state_owner
, so_seqid
);
1119 if (status
== -NFS4ERR_BAD_SEQID
)
1120 nfs4_reset_state_owner(sp
);
1121 if (!nfs4_has_session(sp
->so_server
->nfs_client
))
1122 nfs_increment_seqid(status
, seqid
);
1126 * Increment the seqid if the LOCK/LOCKU succeeded, or
1127 * failed with a seqid incrementing error -
1128 * see comments nfs4.h:seqid_mutating_error()
1130 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
1133 nfs_increment_seqid(status
, seqid
);
1136 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
1138 struct nfs_seqid_counter
*sequence
;
1143 sequence
= seqid
->sequence
;
1144 spin_lock(&sequence
->lock
);
1146 if (list_empty(&seqid
->list
))
1147 list_add_tail(&seqid
->list
, &sequence
->list
);
1148 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
1150 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
1153 spin_unlock(&sequence
->lock
);
1158 static int nfs4_run_state_manager(void *);
1160 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1162 smp_mb__before_atomic();
1163 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1164 smp_mb__after_atomic();
1165 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1166 rpc_wake_up(&clp
->cl_rpcwaitq
);
1170 * Schedule the nfs_client asynchronous state management routine
1172 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1174 struct task_struct
*task
;
1175 char buf
[INET6_ADDRSTRLEN
+ sizeof("-manager") + 1];
1177 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1179 __module_get(THIS_MODULE
);
1180 atomic_inc(&clp
->cl_count
);
1182 /* The rcu_read_lock() is not strictly necessary, as the state
1183 * manager is the only thread that ever changes the rpc_xprt
1184 * after it's initialized. At this point, we're single threaded. */
1186 snprintf(buf
, sizeof(buf
), "%s-manager",
1187 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_ADDR
));
1189 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s", buf
);
1191 printk(KERN_ERR
"%s: kthread_run: %ld\n",
1192 __func__
, PTR_ERR(task
));
1193 nfs4_clear_state_manager_bit(clp
);
1194 nfs_put_client(clp
);
1195 module_put(THIS_MODULE
);
1200 * Schedule a lease recovery attempt
1202 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1206 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1207 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1208 dprintk("%s: scheduling lease recovery for server %s\n", __func__
,
1210 nfs4_schedule_state_manager(clp
);
1212 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery
);
1215 * nfs4_schedule_migration_recovery - trigger migration recovery
1217 * @server: FSID that is migrating
1219 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1220 * value is returned.
1222 int nfs4_schedule_migration_recovery(const struct nfs_server
*server
)
1224 struct nfs_client
*clp
= server
->nfs_client
;
1226 if (server
->fh_expire_type
!= NFS4_FH_PERSISTENT
) {
1227 pr_err("NFS: volatile file handles not supported (server %s)\n",
1232 if (test_bit(NFS_MIG_FAILED
, &server
->mig_status
))
1235 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1237 (unsigned long long)server
->fsid
.major
,
1238 (unsigned long long)server
->fsid
.minor
,
1241 set_bit(NFS_MIG_IN_TRANSITION
,
1242 &((struct nfs_server
*)server
)->mig_status
);
1243 set_bit(NFS4CLNT_MOVED
, &clp
->cl_state
);
1245 nfs4_schedule_state_manager(clp
);
1248 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery
);
1251 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1253 * @clp: server to check for moved leases
1256 void nfs4_schedule_lease_moved_recovery(struct nfs_client
*clp
)
1258 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1259 __func__
, clp
->cl_clientid
, clp
->cl_hostname
);
1261 set_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
);
1262 nfs4_schedule_state_manager(clp
);
1264 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery
);
1266 int nfs4_wait_clnt_recover(struct nfs_client
*clp
)
1272 atomic_inc(&clp
->cl_count
);
1273 res
= wait_on_bit_action(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
,
1274 nfs_wait_bit_killable
, TASK_KILLABLE
);
1277 if (clp
->cl_cons_state
< 0)
1278 res
= clp
->cl_cons_state
;
1280 nfs_put_client(clp
);
1284 int nfs4_client_recover_expired_lease(struct nfs_client
*clp
)
1289 for (loop
= NFS4_MAX_LOOP_ON_RECOVER
; loop
!= 0; loop
--) {
1290 ret
= nfs4_wait_clnt_recover(clp
);
1293 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) &&
1294 !test_bit(NFS4CLNT_CHECK_LEASE
,&clp
->cl_state
))
1296 nfs4_schedule_state_manager(clp
);
1303 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1304 * @clp: client to process
1306 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1307 * resend of the SETCLIENTID and hence re-establish the
1308 * callback channel. Then return all existing delegations.
1310 static void nfs40_handle_cb_pathdown(struct nfs_client
*clp
)
1312 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1313 nfs_expire_all_delegations(clp
);
1314 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__
,
1318 void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
)
1320 nfs40_handle_cb_pathdown(clp
);
1321 nfs4_schedule_state_manager(clp
);
1324 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1327 if (!nfs4_valid_open_stateid(state
))
1329 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1330 /* Don't recover state that expired before the reboot */
1331 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1332 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1335 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1336 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1340 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1342 if (!nfs4_valid_open_stateid(state
))
1344 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1345 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1346 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1347 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1351 int nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1353 struct nfs_client
*clp
= server
->nfs_client
;
1355 if (!nfs4_state_mark_reclaim_nograce(clp
, state
))
1357 dprintk("%s: scheduling stateid recovery for server %s\n", __func__
,
1359 nfs4_schedule_state_manager(clp
);
1362 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery
);
1364 static struct nfs4_lock_state
*
1365 nfs_state_find_lock_state_by_stateid(struct nfs4_state
*state
,
1366 const nfs4_stateid
*stateid
)
1368 struct nfs4_lock_state
*pos
;
1370 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
1371 if (!test_bit(NFS_LOCK_INITIALIZED
, &pos
->ls_flags
))
1373 if (nfs4_stateid_match_other(&pos
->ls_stateid
, stateid
))
1379 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state
*state
,
1380 const nfs4_stateid
*stateid
)
1384 if (test_bit(LK_STATE_IN_USE
, &state
->flags
)) {
1385 spin_lock(&state
->state_lock
);
1386 if (nfs_state_find_lock_state_by_stateid(state
, stateid
))
1388 spin_unlock(&state
->state_lock
);
1393 void nfs_inode_find_state_and_recover(struct inode
*inode
,
1394 const nfs4_stateid
*stateid
)
1396 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
1397 struct nfs_inode
*nfsi
= NFS_I(inode
);
1398 struct nfs_open_context
*ctx
;
1399 struct nfs4_state
*state
;
1402 spin_lock(&inode
->i_lock
);
1403 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1407 if (nfs4_stateid_match_other(&state
->stateid
, stateid
) &&
1408 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1412 if (nfs_state_lock_state_matches_stateid(state
, stateid
) &&
1413 nfs4_state_mark_reclaim_nograce(clp
, state
))
1416 spin_unlock(&inode
->i_lock
);
1418 nfs_inode_find_delegation_state_and_recover(inode
, stateid
);
1420 nfs4_schedule_state_manager(clp
);
1423 static void nfs4_state_mark_open_context_bad(struct nfs4_state
*state
)
1425 struct inode
*inode
= state
->inode
;
1426 struct nfs_inode
*nfsi
= NFS_I(inode
);
1427 struct nfs_open_context
*ctx
;
1429 spin_lock(&inode
->i_lock
);
1430 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1431 if (ctx
->state
!= state
)
1433 set_bit(NFS_CONTEXT_BAD
, &ctx
->flags
);
1435 spin_unlock(&inode
->i_lock
);
1438 static void nfs4_state_mark_recovery_failed(struct nfs4_state
*state
, int error
)
1440 set_bit(NFS_STATE_RECOVERY_FAILED
, &state
->flags
);
1441 nfs4_state_mark_open_context_bad(state
);
1445 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1447 struct inode
*inode
= state
->inode
;
1448 struct nfs_inode
*nfsi
= NFS_I(inode
);
1449 struct file_lock
*fl
;
1451 struct file_lock_context
*flctx
= inode
->i_flctx
;
1452 struct list_head
*list
;
1457 list
= &flctx
->flc_posix
;
1459 /* Guard against delegation returns and new lock/unlock calls */
1460 down_write(&nfsi
->rwsem
);
1461 spin_lock(&flctx
->flc_lock
);
1463 list_for_each_entry(fl
, list
, fl_list
) {
1464 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1466 spin_unlock(&flctx
->flc_lock
);
1467 status
= ops
->recover_lock(state
, fl
);
1472 case -NFS4ERR_ADMIN_REVOKED
:
1473 case -NFS4ERR_STALE_STATEID
:
1474 case -NFS4ERR_BAD_STATEID
:
1475 case -NFS4ERR_EXPIRED
:
1476 case -NFS4ERR_NO_GRACE
:
1477 case -NFS4ERR_STALE_CLIENTID
:
1478 case -NFS4ERR_BADSESSION
:
1479 case -NFS4ERR_BADSLOT
:
1480 case -NFS4ERR_BAD_HIGH_SLOT
:
1481 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1484 pr_err("NFS: %s: unhandled error %d\n",
1487 case -NFS4ERR_DENIED
:
1488 case -NFS4ERR_RECLAIM_BAD
:
1489 case -NFS4ERR_RECLAIM_CONFLICT
:
1490 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1493 spin_lock(&flctx
->flc_lock
);
1495 if (list
== &flctx
->flc_posix
) {
1496 list
= &flctx
->flc_flock
;
1499 spin_unlock(&flctx
->flc_lock
);
1501 up_write(&nfsi
->rwsem
);
1505 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1507 struct nfs4_state
*state
;
1508 struct nfs4_lock_state
*lock
;
1511 /* Note: we rely on the sp->so_states list being ordered
1512 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1514 * This is needed to ensure that the server won't give us any
1515 * read delegations that we have to return if, say, we are
1516 * recovering after a network partition or a reboot from a
1517 * server that doesn't support a grace period.
1519 spin_lock(&sp
->so_lock
);
1520 raw_write_seqcount_begin(&sp
->so_reclaim_seqcount
);
1522 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1523 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1525 if (!nfs4_valid_open_stateid(state
))
1527 if (state
->state
== 0)
1529 atomic_inc(&state
->count
);
1530 spin_unlock(&sp
->so_lock
);
1531 status
= ops
->recover_open(sp
, state
);
1533 status
= nfs4_reclaim_locks(state
, ops
);
1535 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
)) {
1536 spin_lock(&state
->state_lock
);
1537 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1538 if (!test_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
))
1539 pr_warn_ratelimited("NFS: "
1541 "failed!\n", __func__
);
1543 spin_unlock(&state
->state_lock
);
1545 clear_bit(NFS_STATE_RECLAIM_NOGRACE
,
1547 nfs4_put_open_state(state
);
1548 spin_lock(&sp
->so_lock
);
1554 printk(KERN_ERR
"NFS: %s: unhandled error %d\n",
1562 /* Open state on this file cannot be recovered */
1563 nfs4_state_mark_recovery_failed(state
, status
);
1567 case -NFS4ERR_ADMIN_REVOKED
:
1568 case -NFS4ERR_STALE_STATEID
:
1569 case -NFS4ERR_OLD_STATEID
:
1570 case -NFS4ERR_BAD_STATEID
:
1571 case -NFS4ERR_RECLAIM_BAD
:
1572 case -NFS4ERR_RECLAIM_CONFLICT
:
1573 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1575 case -NFS4ERR_EXPIRED
:
1576 case -NFS4ERR_NO_GRACE
:
1577 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1578 case -NFS4ERR_STALE_CLIENTID
:
1579 case -NFS4ERR_BADSESSION
:
1580 case -NFS4ERR_BADSLOT
:
1581 case -NFS4ERR_BAD_HIGH_SLOT
:
1582 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1585 nfs4_put_open_state(state
);
1586 spin_lock(&sp
->so_lock
);
1589 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1590 spin_unlock(&sp
->so_lock
);
1593 nfs4_put_open_state(state
);
1594 spin_lock(&sp
->so_lock
);
1595 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1596 spin_unlock(&sp
->so_lock
);
1600 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1602 struct nfs4_lock_state
*lock
;
1604 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1605 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1606 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1607 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1608 spin_lock(&state
->state_lock
);
1609 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1610 lock
->ls_seqid
.flags
= 0;
1611 clear_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
);
1613 spin_unlock(&state
->state_lock
);
1616 static void nfs4_reset_seqids(struct nfs_server
*server
,
1617 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1619 struct nfs_client
*clp
= server
->nfs_client
;
1620 struct nfs4_state_owner
*sp
;
1621 struct rb_node
*pos
;
1622 struct nfs4_state
*state
;
1624 spin_lock(&clp
->cl_lock
);
1625 for (pos
= rb_first(&server
->state_owners
);
1627 pos
= rb_next(pos
)) {
1628 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1629 sp
->so_seqid
.flags
= 0;
1630 spin_lock(&sp
->so_lock
);
1631 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1632 if (mark_reclaim(clp
, state
))
1633 nfs4_clear_open_state(state
);
1635 spin_unlock(&sp
->so_lock
);
1637 spin_unlock(&clp
->cl_lock
);
1640 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1641 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1643 struct nfs_server
*server
;
1646 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1647 nfs4_reset_seqids(server
, mark_reclaim
);
1651 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1653 /* Mark all delegations for reclaim */
1654 nfs_delegation_mark_reclaim(clp
);
1655 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1658 static int nfs4_reclaim_complete(struct nfs_client
*clp
,
1659 const struct nfs4_state_recovery_ops
*ops
,
1660 struct rpc_cred
*cred
)
1662 /* Notify the server we're done reclaiming our state */
1663 if (ops
->reclaim_complete
)
1664 return ops
->reclaim_complete(clp
, cred
);
1668 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1670 struct nfs_client
*clp
= server
->nfs_client
;
1671 struct nfs4_state_owner
*sp
;
1672 struct rb_node
*pos
;
1673 struct nfs4_state
*state
;
1675 spin_lock(&clp
->cl_lock
);
1676 for (pos
= rb_first(&server
->state_owners
);
1678 pos
= rb_next(pos
)) {
1679 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1680 spin_lock(&sp
->so_lock
);
1681 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1682 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1685 nfs4_state_mark_reclaim_nograce(clp
, state
);
1687 spin_unlock(&sp
->so_lock
);
1689 spin_unlock(&clp
->cl_lock
);
1692 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1694 struct nfs_server
*server
;
1696 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1700 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1701 nfs4_clear_reclaim_server(server
);
1704 nfs_delegation_reap_unclaimed(clp
);
1708 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1710 const struct nfs4_state_recovery_ops
*ops
;
1711 struct rpc_cred
*cred
;
1714 if (!nfs4_state_clear_reclaim_reboot(clp
))
1716 ops
= clp
->cl_mvops
->reboot_recovery_ops
;
1717 cred
= nfs4_get_clid_cred(clp
);
1718 err
= nfs4_reclaim_complete(clp
, ops
, cred
);
1720 if (err
== -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
)
1721 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1724 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1726 nfs_mark_test_expired_all_delegations(clp
);
1727 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1730 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1735 case -NFS4ERR_CB_PATH_DOWN
:
1736 nfs40_handle_cb_pathdown(clp
);
1738 case -NFS4ERR_NO_GRACE
:
1739 nfs4_state_end_reclaim_reboot(clp
);
1741 case -NFS4ERR_STALE_CLIENTID
:
1742 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1743 nfs4_state_start_reclaim_reboot(clp
);
1745 case -NFS4ERR_EXPIRED
:
1746 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1747 nfs4_state_start_reclaim_nograce(clp
);
1749 case -NFS4ERR_BADSESSION
:
1750 case -NFS4ERR_BADSLOT
:
1751 case -NFS4ERR_BAD_HIGH_SLOT
:
1752 case -NFS4ERR_DEADSESSION
:
1753 case -NFS4ERR_SEQ_FALSE_RETRY
:
1754 case -NFS4ERR_SEQ_MISORDERED
:
1755 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1756 /* Zero session reset errors */
1758 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1759 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
1762 dprintk("%s: failed to handle error %d for server %s\n",
1763 __func__
, error
, clp
->cl_hostname
);
1766 dprintk("%s: handled error %d for server %s\n", __func__
, error
,
1771 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1773 struct nfs4_state_owner
*sp
;
1774 struct nfs_server
*server
;
1775 struct rb_node
*pos
;
1780 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1781 nfs4_purge_state_owners(server
);
1782 spin_lock(&clp
->cl_lock
);
1783 for (pos
= rb_first(&server
->state_owners
);
1785 pos
= rb_next(pos
)) {
1787 struct nfs4_state_owner
, so_server_node
);
1788 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1791 if (!atomic_inc_not_zero(&sp
->so_count
))
1793 spin_unlock(&clp
->cl_lock
);
1796 status
= nfs4_reclaim_open_state(sp
, ops
);
1798 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1799 nfs4_put_state_owner(sp
);
1800 status
= nfs4_recovery_handle_error(clp
, status
);
1801 return (status
!= 0) ? status
: -EAGAIN
;
1804 nfs4_put_state_owner(sp
);
1807 spin_unlock(&clp
->cl_lock
);
1813 static int nfs4_check_lease(struct nfs_client
*clp
)
1815 struct rpc_cred
*cred
;
1816 const struct nfs4_state_maintenance_ops
*ops
=
1817 clp
->cl_mvops
->state_renewal_ops
;
1820 /* Is the client already known to have an expired lease? */
1821 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1823 spin_lock(&clp
->cl_lock
);
1824 cred
= ops
->get_state_renewal_cred_locked(clp
);
1825 spin_unlock(&clp
->cl_lock
);
1827 cred
= nfs4_get_clid_cred(clp
);
1832 status
= ops
->renew_lease(clp
, cred
);
1834 if (status
== -ETIMEDOUT
) {
1835 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1839 return nfs4_recovery_handle_error(clp
, status
);
1842 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1843 * and for recoverable errors on EXCHANGE_ID for v4.1
1845 static int nfs4_handle_reclaim_lease_error(struct nfs_client
*clp
, int status
)
1848 case -NFS4ERR_SEQ_MISORDERED
:
1849 if (test_and_set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
))
1850 return -ESERVERFAULT
;
1851 /* Lease confirmation error: retry after purging the lease */
1853 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1855 case -NFS4ERR_STALE_CLIENTID
:
1856 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1857 nfs4_state_start_reclaim_reboot(clp
);
1859 case -NFS4ERR_CLID_INUSE
:
1860 pr_err("NFS: Server %s reports our clientid is in use\n",
1862 nfs_mark_client_ready(clp
, -EPERM
);
1863 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1866 case -NFS4ERR_DELAY
:
1872 case -NFS4ERR_MINOR_VERS_MISMATCH
:
1873 if (clp
->cl_cons_state
== NFS_CS_SESSION_INITING
)
1874 nfs_mark_client_ready(clp
, -EPROTONOSUPPORT
);
1875 dprintk("%s: exit with error %d for server %s\n",
1876 __func__
, -EPROTONOSUPPORT
, clp
->cl_hostname
);
1877 return -EPROTONOSUPPORT
;
1878 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1879 * in nfs4_exchange_id */
1881 dprintk("%s: exit with error %d for server %s\n", __func__
,
1882 status
, clp
->cl_hostname
);
1885 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1886 dprintk("%s: handled error %d for server %s\n", __func__
, status
,
1891 static int nfs4_establish_lease(struct nfs_client
*clp
)
1893 struct rpc_cred
*cred
;
1894 const struct nfs4_state_recovery_ops
*ops
=
1895 clp
->cl_mvops
->reboot_recovery_ops
;
1898 nfs4_begin_drain_session(clp
);
1899 cred
= nfs4_get_clid_cred(clp
);
1902 status
= ops
->establish_clid(clp
, cred
);
1906 pnfs_destroy_all_layouts(clp
);
1911 * Returns zero or a negative errno. NFS4ERR values are converted
1912 * to local errno values.
1914 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
1918 status
= nfs4_establish_lease(clp
);
1920 return nfs4_handle_reclaim_lease_error(clp
, status
);
1921 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
, &clp
->cl_state
))
1922 nfs4_state_start_reclaim_nograce(clp
);
1923 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
1924 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1925 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1926 clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1930 static int nfs4_purge_lease(struct nfs_client
*clp
)
1934 status
= nfs4_establish_lease(clp
);
1936 return nfs4_handle_reclaim_lease_error(clp
, status
);
1937 clear_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
1938 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1939 nfs4_state_start_reclaim_nograce(clp
);
1944 * Try remote migration of one FSID from a source server to a
1945 * destination server. The source server provides a list of
1946 * potential destinations.
1948 * Returns zero or a negative NFS4ERR status code.
1950 static int nfs4_try_migration(struct nfs_server
*server
, struct rpc_cred
*cred
)
1952 struct nfs_client
*clp
= server
->nfs_client
;
1953 struct nfs4_fs_locations
*locations
= NULL
;
1954 struct inode
*inode
;
1958 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__
,
1959 (unsigned long long)server
->fsid
.major
,
1960 (unsigned long long)server
->fsid
.minor
,
1964 page
= alloc_page(GFP_KERNEL
);
1965 locations
= kmalloc(sizeof(struct nfs4_fs_locations
), GFP_KERNEL
);
1966 if (page
== NULL
|| locations
== NULL
) {
1967 dprintk("<-- %s: no memory\n", __func__
);
1971 inode
= d_inode(server
->super
->s_root
);
1972 result
= nfs4_proc_get_locations(inode
, locations
, page
, cred
);
1974 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1979 result
= -NFS4ERR_NXIO
;
1980 if (!(locations
->fattr
.valid
& NFS_ATTR_FATTR_V4_LOCATIONS
)) {
1981 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1986 nfs4_begin_drain_session(clp
);
1988 status
= nfs4_replace_transport(server
, locations
);
1990 dprintk("<-- %s: failed to replace transport: %d\n",
1996 dprintk("<-- %s: migration succeeded\n", __func__
);
2003 pr_err("NFS: migration recovery failed (server %s)\n",
2005 set_bit(NFS_MIG_FAILED
, &server
->mig_status
);
2011 * Returns zero or a negative NFS4ERR status code.
2013 static int nfs4_handle_migration(struct nfs_client
*clp
)
2015 const struct nfs4_state_maintenance_ops
*ops
=
2016 clp
->cl_mvops
->state_renewal_ops
;
2017 struct nfs_server
*server
;
2018 struct rpc_cred
*cred
;
2020 dprintk("%s: migration reported on \"%s\"\n", __func__
,
2023 spin_lock(&clp
->cl_lock
);
2024 cred
= ops
->get_state_renewal_cred_locked(clp
);
2025 spin_unlock(&clp
->cl_lock
);
2027 return -NFS4ERR_NOENT
;
2032 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2035 if (server
->mig_gen
== clp
->cl_mig_gen
)
2037 server
->mig_gen
= clp
->cl_mig_gen
;
2039 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION
,
2040 &server
->mig_status
))
2044 status
= nfs4_try_migration(server
, cred
);
2057 * Test each nfs_server on the clp's cl_superblocks list to see
2058 * if it's moved to another server. Stop when the server no longer
2059 * returns NFS4ERR_LEASE_MOVED.
2061 static int nfs4_handle_lease_moved(struct nfs_client
*clp
)
2063 const struct nfs4_state_maintenance_ops
*ops
=
2064 clp
->cl_mvops
->state_renewal_ops
;
2065 struct nfs_server
*server
;
2066 struct rpc_cred
*cred
;
2068 dprintk("%s: lease moved reported on \"%s\"\n", __func__
,
2071 spin_lock(&clp
->cl_lock
);
2072 cred
= ops
->get_state_renewal_cred_locked(clp
);
2073 spin_unlock(&clp
->cl_lock
);
2075 return -NFS4ERR_NOENT
;
2080 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2081 struct inode
*inode
;
2084 if (server
->mig_gen
== clp
->cl_mig_gen
)
2086 server
->mig_gen
= clp
->cl_mig_gen
;
2090 inode
= d_inode(server
->super
->s_root
);
2091 status
= nfs4_proc_fsid_present(inode
, cred
);
2092 if (status
!= -NFS4ERR_MOVED
)
2093 goto restart
; /* wasn't this one */
2094 if (nfs4_try_migration(server
, cred
) == -NFS4ERR_LEASE_MOVED
)
2095 goto restart
; /* there are more */
2106 * nfs4_discover_server_trunking - Detect server IP address trunking
2108 * @clp: nfs_client under test
2109 * @result: OUT: found nfs_client, or clp
2111 * Returns zero or a negative errno. If zero is returned,
2112 * an nfs_client pointer is planted in "result".
2114 * Note: since we are invoked in process context, and
2115 * not from inside the state manager, we cannot use
2116 * nfs4_handle_reclaim_lease_error().
2118 int nfs4_discover_server_trunking(struct nfs_client
*clp
,
2119 struct nfs_client
**result
)
2121 const struct nfs4_state_recovery_ops
*ops
=
2122 clp
->cl_mvops
->reboot_recovery_ops
;
2123 struct rpc_clnt
*clnt
;
2124 struct rpc_cred
*cred
;
2127 dprintk("NFS: %s: testing '%s'\n", __func__
, clp
->cl_hostname
);
2129 clnt
= clp
->cl_rpcclient
;
2132 mutex_lock(&nfs_clid_init_mutex
);
2135 cred
= nfs4_get_clid_cred(clp
);
2139 status
= ops
->detect_trunking(clp
, result
, cred
);
2147 if (clnt
->cl_softrtry
)
2149 case -NFS4ERR_DELAY
:
2152 case -NFS4ERR_STALE_CLIENTID
:
2153 dprintk("NFS: %s after status %d, retrying\n",
2158 nfs4_root_machine_cred(clp
);
2161 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
)
2163 case -NFS4ERR_CLID_INUSE
:
2164 case -NFS4ERR_WRONGSEC
:
2165 /* No point in retrying if we already used RPC_AUTH_UNIX */
2166 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
) {
2170 clnt
= rpc_clone_client_set_auth(clnt
, RPC_AUTH_UNIX
);
2172 status
= PTR_ERR(clnt
);
2175 /* Note: this is safe because we haven't yet marked the
2176 * client as ready, so we are the only user of
2179 clnt
= xchg(&clp
->cl_rpcclient
, clnt
);
2180 rpc_shutdown_client(clnt
);
2181 clnt
= clp
->cl_rpcclient
;
2184 case -NFS4ERR_MINOR_VERS_MISMATCH
:
2185 status
= -EPROTONOSUPPORT
;
2189 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
2190 * in nfs4_exchange_id */
2191 status
= -EKEYEXPIRED
;
2194 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2200 mutex_unlock(&nfs_clid_init_mutex
);
2201 dprintk("NFS: %s: status = %d\n", __func__
, status
);
2205 #ifdef CONFIG_NFS_V4_1
2206 void nfs4_schedule_session_recovery(struct nfs4_session
*session
, int err
)
2208 struct nfs_client
*clp
= session
->clp
;
2212 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2214 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
2215 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2217 nfs4_schedule_state_manager(clp
);
2219 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
2221 void nfs41_notify_server(struct nfs_client
*clp
)
2223 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2224 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2225 nfs4_schedule_state_manager(clp
);
2228 static void nfs4_reset_all_state(struct nfs_client
*clp
)
2230 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2231 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2232 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
2233 nfs4_state_start_reclaim_nograce(clp
);
2234 dprintk("%s: scheduling reset of all state for server %s!\n",
2235 __func__
, clp
->cl_hostname
);
2236 nfs4_schedule_state_manager(clp
);
2240 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
2242 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2243 nfs4_state_start_reclaim_reboot(clp
);
2244 dprintk("%s: server %s rebooted!\n", __func__
,
2246 nfs4_schedule_state_manager(clp
);
2250 static void nfs41_handle_all_state_revoked(struct nfs_client
*clp
)
2252 nfs4_reset_all_state(clp
);
2253 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2256 static void nfs41_handle_some_state_revoked(struct nfs_client
*clp
)
2258 nfs4_state_start_reclaim_nograce(clp
);
2259 nfs4_schedule_state_manager(clp
);
2261 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2264 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
2266 /* FIXME: For now, we destroy all layouts. */
2267 pnfs_destroy_all_layouts(clp
);
2268 /* FIXME: For now, we test all delegations+open state+locks. */
2269 nfs41_handle_some_state_revoked(clp
);
2270 dprintk("%s: Recallable state revoked on server %s!\n", __func__
,
2274 static void nfs41_handle_backchannel_fault(struct nfs_client
*clp
)
2276 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2277 nfs4_schedule_state_manager(clp
);
2279 dprintk("%s: server %s declared a backchannel fault\n", __func__
,
2283 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
2285 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2286 &clp
->cl_state
) == 0)
2287 nfs4_schedule_state_manager(clp
);
2290 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
,
2296 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2297 __func__
, clp
->cl_hostname
, clp
->cl_clientid
, flags
);
2299 * If we're called from the state manager thread, then assume we're
2300 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2301 * Those flags are expected to remain set until we're done
2302 * recovering (see RFC5661, section 18.46.3).
2307 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
2308 nfs41_handle_server_reboot(clp
);
2309 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
))
2310 nfs41_handle_all_state_revoked(clp
);
2311 if (flags
& (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
2312 SEQ4_STATUS_ADMIN_STATE_REVOKED
))
2313 nfs41_handle_some_state_revoked(clp
);
2314 if (flags
& SEQ4_STATUS_LEASE_MOVED
)
2315 nfs4_schedule_lease_moved_recovery(clp
);
2316 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
2317 nfs41_handle_recallable_state_revoked(clp
);
2319 if (flags
& SEQ4_STATUS_BACKCHANNEL_FAULT
)
2320 nfs41_handle_backchannel_fault(clp
);
2321 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
2322 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
2323 nfs41_handle_cb_path_down(clp
);
2326 static int nfs4_reset_session(struct nfs_client
*clp
)
2328 struct rpc_cred
*cred
;
2331 if (!nfs4_has_session(clp
))
2333 nfs4_begin_drain_session(clp
);
2334 cred
= nfs4_get_clid_cred(clp
);
2335 status
= nfs4_proc_destroy_session(clp
->cl_session
, cred
);
2338 case -NFS4ERR_BADSESSION
:
2339 case -NFS4ERR_DEADSESSION
:
2341 case -NFS4ERR_BACK_CHAN_BUSY
:
2342 case -NFS4ERR_DELAY
:
2343 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2348 status
= nfs4_recovery_handle_error(clp
, status
);
2352 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
2353 status
= nfs4_proc_create_session(clp
, cred
);
2355 dprintk("%s: session reset failed with status %d for server %s!\n",
2356 __func__
, status
, clp
->cl_hostname
);
2357 status
= nfs4_handle_reclaim_lease_error(clp
, status
);
2360 nfs41_finish_session_reset(clp
);
2361 dprintk("%s: session reset was successful for server %s!\n",
2362 __func__
, clp
->cl_hostname
);
2369 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2371 struct rpc_cred
*cred
;
2374 if (!nfs4_has_session(clp
))
2376 nfs4_begin_drain_session(clp
);
2377 cred
= nfs4_get_clid_cred(clp
);
2378 ret
= nfs4_proc_bind_conn_to_session(clp
, cred
);
2381 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2384 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2385 __func__
, clp
->cl_hostname
);
2387 case -NFS4ERR_DELAY
:
2389 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2392 return nfs4_recovery_handle_error(clp
, ret
);
2396 #else /* CONFIG_NFS_V4_1 */
2397 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
2399 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2403 #endif /* CONFIG_NFS_V4_1 */
2405 static void nfs4_state_manager(struct nfs_client
*clp
)
2408 const char *section
= "", *section_sep
= "";
2410 /* Ensure exclusive access to NFSv4 state */
2412 if (test_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
)) {
2413 section
= "purge state";
2414 status
= nfs4_purge_lease(clp
);
2420 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
2421 section
= "lease expired";
2422 /* We're going to have to re-establish a clientid */
2423 status
= nfs4_reclaim_lease(clp
);
2429 /* Initialize or reset the session */
2430 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)) {
2431 section
= "reset session";
2432 status
= nfs4_reset_session(clp
);
2433 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
2439 /* Send BIND_CONN_TO_SESSION */
2440 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2442 section
= "bind conn to session";
2443 status
= nfs4_bind_conn_to_session(clp
);
2449 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
2450 section
= "check lease";
2451 status
= nfs4_check_lease(clp
);
2457 if (test_and_clear_bit(NFS4CLNT_MOVED
, &clp
->cl_state
)) {
2458 section
= "migration";
2459 status
= nfs4_handle_migration(clp
);
2464 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
)) {
2465 section
= "lease moved";
2466 status
= nfs4_handle_lease_moved(clp
);
2471 /* First recover reboot state... */
2472 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
2473 section
= "reclaim reboot";
2474 status
= nfs4_do_reclaim(clp
,
2475 clp
->cl_mvops
->reboot_recovery_ops
);
2476 if (status
== -EAGAIN
)
2480 nfs4_state_end_reclaim_reboot(clp
);
2483 /* Detect expired delegations... */
2484 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED
, &clp
->cl_state
)) {
2485 section
= "detect expired delegations";
2486 nfs_reap_expired_delegations(clp
);
2490 /* Now recover expired state... */
2491 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
2492 section
= "reclaim nograce";
2493 status
= nfs4_do_reclaim(clp
,
2494 clp
->cl_mvops
->nograce_recovery_ops
);
2495 if (status
== -EAGAIN
)
2501 nfs4_end_drain_session(clp
);
2502 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
2503 nfs_client_return_marked_delegations(clp
);
2507 nfs4_clear_state_manager_bit(clp
);
2508 /* Did we race with an attempt to give us more work? */
2509 if (clp
->cl_state
== 0)
2511 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
2513 } while (atomic_read(&clp
->cl_count
) > 1);
2516 if (strlen(section
))
2518 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2519 " with error %d\n", section_sep
, section
,
2520 clp
->cl_hostname
, -status
);
2522 nfs4_end_drain_session(clp
);
2523 nfs4_clear_state_manager_bit(clp
);
2526 static int nfs4_run_state_manager(void *ptr
)
2528 struct nfs_client
*clp
= ptr
;
2530 allow_signal(SIGKILL
);
2531 nfs4_state_manager(clp
);
2532 nfs_put_client(clp
);
2533 module_put_and_exit(0);