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 const nfs4_stateid invalid_stateid
= {
74 /* Funky initialiser keeps older gcc versions happy */
75 .data
= { 0xff, 0xff, 0xff, 0xff, 0 },
77 .type
= NFS4_INVALID_STATEID_TYPE
,
80 const nfs4_stateid current_stateid
= {
82 /* Funky initialiser keeps older gcc versions happy */
83 .data
= { 0x0, 0x0, 0x0, 0x1, 0 },
85 .type
= NFS4_SPECIAL_STATEID_TYPE
,
88 static DEFINE_MUTEX(nfs_clid_init_mutex
);
90 static int nfs4_setup_state_renewal(struct nfs_client
*clp
)
93 struct nfs_fsinfo fsinfo
;
96 if (!test_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
)) {
97 nfs4_schedule_state_renewal(clp
);
102 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
104 nfs4_set_lease_period(clp
, fsinfo
.lease_time
* HZ
, now
);
105 nfs4_schedule_state_renewal(clp
);
111 int nfs4_init_clientid(struct nfs_client
*clp
, const struct cred
*cred
)
113 struct nfs4_setclientid_res clid
= {
114 .clientid
= clp
->cl_clientid
,
115 .confirm
= clp
->cl_confirm
,
119 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
121 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
123 port
= nn
->nfs_callback_tcpport
;
124 if (clp
->cl_addr
.ss_family
== AF_INET6
)
125 port
= nn
->nfs_callback_tcpport6
;
127 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
130 clp
->cl_clientid
= clid
.clientid
;
131 clp
->cl_confirm
= clid
.confirm
;
132 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
134 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
137 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
138 nfs4_setup_state_renewal(clp
);
144 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
146 * @clp: nfs_client under test
147 * @result: OUT: found nfs_client, or clp
148 * @cred: credential to use for trunking test
150 * Returns zero, a negative errno, or a negative NFS4ERR status.
151 * If zero is returned, an nfs_client pointer is planted in
154 * Note: The returned client may not yet be marked ready.
156 int nfs40_discover_server_trunking(struct nfs_client
*clp
,
157 struct nfs_client
**result
,
158 const struct cred
*cred
)
160 struct nfs4_setclientid_res clid
= {
161 .clientid
= clp
->cl_clientid
,
162 .confirm
= clp
->cl_confirm
,
164 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
168 port
= nn
->nfs_callback_tcpport
;
169 if (clp
->cl_addr
.ss_family
== AF_INET6
)
170 port
= nn
->nfs_callback_tcpport6
;
172 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
175 clp
->cl_clientid
= clid
.clientid
;
176 clp
->cl_confirm
= clid
.confirm
;
178 status
= nfs40_walk_client_list(clp
, result
, cred
);
180 /* Sustain the lease, even if it's empty. If the clientid4
181 * goes stale it's of no use for trunking discovery. */
182 nfs4_schedule_state_renewal(*result
);
184 /* If the client state need to recover, do it. */
186 nfs4_schedule_state_manager(clp
);
192 const struct cred
*nfs4_get_machine_cred(struct nfs_client
*clp
)
194 return get_cred(rpc_machine_cred());
197 static void nfs4_root_machine_cred(struct nfs_client
*clp
)
200 /* Force root creds instead of machine */
201 clp
->cl_principal
= NULL
;
202 clp
->cl_rpcclient
->cl_principal
= NULL
;
205 static const struct cred
*
206 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
208 const struct cred
*cred
= NULL
;
209 struct nfs4_state_owner
*sp
;
212 for (pos
= rb_first(&server
->state_owners
);
214 pos
= rb_next(pos
)) {
215 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
216 if (list_empty(&sp
->so_states
))
218 cred
= get_cred(sp
->so_cred
);
225 * nfs4_get_renew_cred - Acquire credential for a renew operation
226 * @clp: client state handle
228 * Returns an rpc_cred with reference count bumped, or NULL.
229 * Caller must hold clp->cl_lock.
231 const struct cred
*nfs4_get_renew_cred(struct nfs_client
*clp
)
233 const struct cred
*cred
= NULL
;
234 struct nfs_server
*server
;
236 /* Use machine credentials if available */
237 cred
= nfs4_get_machine_cred(clp
);
241 spin_lock(&clp
->cl_lock
);
243 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
244 cred
= nfs4_get_renew_cred_server_locked(server
);
249 spin_unlock(&clp
->cl_lock
);
255 static void nfs4_end_drain_slot_table(struct nfs4_slot_table
*tbl
)
257 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
)) {
258 spin_lock(&tbl
->slot_tbl_lock
);
259 nfs41_wake_slot_table(tbl
);
260 spin_unlock(&tbl
->slot_tbl_lock
);
264 static void nfs4_end_drain_session(struct nfs_client
*clp
)
266 struct nfs4_session
*ses
= clp
->cl_session
;
268 if (clp
->cl_slot_tbl
) {
269 nfs4_end_drain_slot_table(clp
->cl_slot_tbl
);
274 nfs4_end_drain_slot_table(&ses
->bc_slot_table
);
275 nfs4_end_drain_slot_table(&ses
->fc_slot_table
);
279 static int nfs4_drain_slot_tbl(struct nfs4_slot_table
*tbl
)
281 set_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
);
282 spin_lock(&tbl
->slot_tbl_lock
);
283 if (tbl
->highest_used_slotid
!= NFS4_NO_SLOT
) {
284 reinit_completion(&tbl
->complete
);
285 spin_unlock(&tbl
->slot_tbl_lock
);
286 return wait_for_completion_interruptible(&tbl
->complete
);
288 spin_unlock(&tbl
->slot_tbl_lock
);
292 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
294 struct nfs4_session
*ses
= clp
->cl_session
;
297 if (clp
->cl_slot_tbl
)
298 return nfs4_drain_slot_tbl(clp
->cl_slot_tbl
);
301 ret
= nfs4_drain_slot_tbl(&ses
->bc_slot_table
);
305 return nfs4_drain_slot_tbl(&ses
->fc_slot_table
);
308 #if defined(CONFIG_NFS_V4_1)
310 static void nfs41_finish_session_reset(struct nfs_client
*clp
)
312 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
313 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
314 /* create_session negotiated new slot table */
315 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
316 nfs4_setup_state_renewal(clp
);
319 int nfs41_init_clientid(struct nfs_client
*clp
, const struct cred
*cred
)
323 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
325 status
= nfs4_proc_exchange_id(clp
, cred
);
328 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
330 status
= nfs4_proc_create_session(clp
, cred
);
333 nfs41_finish_session_reset(clp
);
334 nfs_mark_client_ready(clp
, NFS_CS_READY
);
340 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
342 * @clp: nfs_client under test
343 * @result: OUT: found nfs_client, or clp
344 * @cred: credential to use for trunking test
346 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
347 * If NFS4_OK is returned, an nfs_client pointer is planted in
350 * Note: The returned client may not yet be marked ready.
352 int nfs41_discover_server_trunking(struct nfs_client
*clp
,
353 struct nfs_client
**result
,
354 const struct cred
*cred
)
358 status
= nfs4_proc_exchange_id(clp
, cred
);
359 if (status
!= NFS4_OK
)
362 status
= nfs41_walk_client_list(clp
, result
, cred
);
369 * Purge state if the client id was established in a prior
370 * instance and the client id could not have arrived on the
371 * server via Transparent State Migration.
373 if (clp
->cl_exchange_flags
& EXCHGID4_FLAG_CONFIRMED_R
) {
374 if (!test_bit(NFS_CS_TSM_POSSIBLE
, &clp
->cl_flags
))
375 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
377 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
379 nfs4_schedule_state_manager(clp
);
380 status
= nfs_wait_client_init_complete(clp
);
386 #endif /* CONFIG_NFS_V4_1 */
389 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
390 * @clp: client state handle
392 * Returns a cred with reference count bumped, or NULL.
394 const struct cred
*nfs4_get_clid_cred(struct nfs_client
*clp
)
396 const struct cred
*cred
;
398 cred
= nfs4_get_machine_cred(clp
);
402 static struct nfs4_state_owner
*
403 nfs4_find_state_owner_locked(struct nfs_server
*server
, const struct cred
*cred
)
405 struct rb_node
**p
= &server
->state_owners
.rb_node
,
407 struct nfs4_state_owner
*sp
;
412 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
413 cmp
= cred_fscmp(cred
, sp
->so_cred
);
416 p
= &parent
->rb_left
;
418 p
= &parent
->rb_right
;
420 if (!list_empty(&sp
->so_lru
))
421 list_del_init(&sp
->so_lru
);
422 atomic_inc(&sp
->so_count
);
429 static struct nfs4_state_owner
*
430 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
432 struct nfs_server
*server
= new->so_server
;
433 struct rb_node
**p
= &server
->state_owners
.rb_node
,
435 struct nfs4_state_owner
*sp
;
440 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
441 cmp
= cred_fscmp(new->so_cred
, sp
->so_cred
);
444 p
= &parent
->rb_left
;
446 p
= &parent
->rb_right
;
448 if (!list_empty(&sp
->so_lru
))
449 list_del_init(&sp
->so_lru
);
450 atomic_inc(&sp
->so_count
);
454 rb_link_node(&new->so_server_node
, parent
, p
);
455 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
460 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
462 struct nfs_server
*server
= sp
->so_server
;
464 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
465 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
469 nfs4_init_seqid_counter(struct nfs_seqid_counter
*sc
)
471 sc
->create_time
= ktime_get();
474 spin_lock_init(&sc
->lock
);
475 INIT_LIST_HEAD(&sc
->list
);
476 rpc_init_wait_queue(&sc
->wait
, "Seqid_waitqueue");
480 nfs4_destroy_seqid_counter(struct nfs_seqid_counter
*sc
)
482 rpc_destroy_wait_queue(&sc
->wait
);
486 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
487 * create a new state_owner.
490 static struct nfs4_state_owner
*
491 nfs4_alloc_state_owner(struct nfs_server
*server
,
492 const struct cred
*cred
,
495 struct nfs4_state_owner
*sp
;
497 sp
= kzalloc(sizeof(*sp
), gfp_flags
);
500 sp
->so_seqid
.owner_id
= ida_simple_get(&server
->openowner_id
, 0, 0,
502 if (sp
->so_seqid
.owner_id
< 0) {
506 sp
->so_server
= server
;
507 sp
->so_cred
= get_cred(cred
);
508 spin_lock_init(&sp
->so_lock
);
509 INIT_LIST_HEAD(&sp
->so_states
);
510 nfs4_init_seqid_counter(&sp
->so_seqid
);
511 atomic_set(&sp
->so_count
, 1);
512 INIT_LIST_HEAD(&sp
->so_lru
);
513 seqcount_init(&sp
->so_reclaim_seqcount
);
514 mutex_init(&sp
->so_delegreturn_mutex
);
519 nfs4_reset_state_owner(struct nfs4_state_owner
*sp
)
521 /* This state_owner is no longer usable, but must
522 * remain in place so that state recovery can find it
523 * and the opens associated with it.
524 * It may also be used for new 'open' request to
525 * return a delegation to the server.
526 * So update the 'create_time' so that it looks like
527 * a new state_owner. This will cause the server to
528 * request an OPEN_CONFIRM to start a new sequence.
530 sp
->so_seqid
.create_time
= ktime_get();
533 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
535 nfs4_destroy_seqid_counter(&sp
->so_seqid
);
536 put_cred(sp
->so_cred
);
537 ida_simple_remove(&sp
->so_server
->openowner_id
, sp
->so_seqid
.owner_id
);
541 static void nfs4_gc_state_owners(struct nfs_server
*server
)
543 struct nfs_client
*clp
= server
->nfs_client
;
544 struct nfs4_state_owner
*sp
, *tmp
;
545 unsigned long time_min
, time_max
;
548 spin_lock(&clp
->cl_lock
);
550 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
551 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
552 /* NB: LRU is sorted so that oldest is at the head */
553 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
555 list_move(&sp
->so_lru
, &doomed
);
556 nfs4_remove_state_owner_locked(sp
);
558 spin_unlock(&clp
->cl_lock
);
560 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
561 list_del(&sp
->so_lru
);
562 nfs4_free_state_owner(sp
);
567 * nfs4_get_state_owner - Look up a state owner given a credential
568 * @server: nfs_server to search
569 * @cred: RPC credential to match
570 * @gfp_flags: allocation mode
572 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
574 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
575 const struct cred
*cred
,
578 struct nfs_client
*clp
= server
->nfs_client
;
579 struct nfs4_state_owner
*sp
, *new;
581 spin_lock(&clp
->cl_lock
);
582 sp
= nfs4_find_state_owner_locked(server
, cred
);
583 spin_unlock(&clp
->cl_lock
);
586 new = nfs4_alloc_state_owner(server
, cred
, gfp_flags
);
589 spin_lock(&clp
->cl_lock
);
590 sp
= nfs4_insert_state_owner_locked(new);
591 spin_unlock(&clp
->cl_lock
);
593 nfs4_free_state_owner(new);
595 nfs4_gc_state_owners(server
);
600 * nfs4_put_state_owner - Release a nfs4_state_owner
601 * @sp: state owner data to release
603 * Note that we keep released state owners on an LRU
605 * This caches valid state owners so that they can be
606 * reused, to avoid the OPEN_CONFIRM on minor version 0.
607 * It also pins the uniquifier of dropped state owners for
608 * a while, to ensure that those state owner names are
611 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
613 struct nfs_server
*server
= sp
->so_server
;
614 struct nfs_client
*clp
= server
->nfs_client
;
616 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
619 sp
->so_expires
= jiffies
;
620 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
621 spin_unlock(&clp
->cl_lock
);
625 * nfs4_purge_state_owners - Release all cached state owners
626 * @server: nfs_server with cached state owners to release
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
631 void nfs4_purge_state_owners(struct nfs_server
*server
)
633 struct nfs_client
*clp
= server
->nfs_client
;
634 struct nfs4_state_owner
*sp
, *tmp
;
637 spin_lock(&clp
->cl_lock
);
638 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
639 list_move(&sp
->so_lru
, &doomed
);
640 nfs4_remove_state_owner_locked(sp
);
642 spin_unlock(&clp
->cl_lock
);
644 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
645 list_del(&sp
->so_lru
);
646 nfs4_free_state_owner(sp
);
650 static struct nfs4_state
*
651 nfs4_alloc_open_state(void)
653 struct nfs4_state
*state
;
655 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
658 refcount_set(&state
->count
, 1);
659 INIT_LIST_HEAD(&state
->lock_states
);
660 spin_lock_init(&state
->state_lock
);
661 seqlock_init(&state
->seqlock
);
662 init_waitqueue_head(&state
->waitq
);
667 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
669 if (state
->state
== fmode
)
671 /* NB! List reordering - see the reclaim code for why. */
672 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
673 if (fmode
& FMODE_WRITE
)
674 list_move(&state
->open_states
, &state
->owner
->so_states
);
676 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
678 state
->state
= fmode
;
681 static struct nfs4_state
*
682 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
684 struct nfs_inode
*nfsi
= NFS_I(inode
);
685 struct nfs4_state
*state
;
687 list_for_each_entry_rcu(state
, &nfsi
->open_states
, inode_states
) {
688 if (state
->owner
!= owner
)
690 if (!nfs4_valid_open_stateid(state
))
692 if (refcount_inc_not_zero(&state
->count
))
699 nfs4_free_open_state(struct nfs4_state
*state
)
701 kfree_rcu(state
, rcu_head
);
705 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
707 struct nfs4_state
*state
, *new;
708 struct nfs_inode
*nfsi
= NFS_I(inode
);
711 state
= __nfs4_find_state_byowner(inode
, owner
);
715 new = nfs4_alloc_open_state();
716 spin_lock(&owner
->so_lock
);
717 spin_lock(&inode
->i_lock
);
718 state
= __nfs4_find_state_byowner(inode
, owner
);
719 if (state
== NULL
&& new != NULL
) {
721 state
->owner
= owner
;
722 atomic_inc(&owner
->so_count
);
723 list_add_rcu(&state
->inode_states
, &nfsi
->open_states
);
725 state
->inode
= inode
;
726 spin_unlock(&inode
->i_lock
);
727 /* Note: The reclaim code dictates that we add stateless
728 * and read-only stateids to the end of the list */
729 list_add_tail(&state
->open_states
, &owner
->so_states
);
730 spin_unlock(&owner
->so_lock
);
732 spin_unlock(&inode
->i_lock
);
733 spin_unlock(&owner
->so_lock
);
735 nfs4_free_open_state(new);
741 void nfs4_put_open_state(struct nfs4_state
*state
)
743 struct inode
*inode
= state
->inode
;
744 struct nfs4_state_owner
*owner
= state
->owner
;
746 if (!refcount_dec_and_lock(&state
->count
, &owner
->so_lock
))
748 spin_lock(&inode
->i_lock
);
749 list_del_rcu(&state
->inode_states
);
750 list_del(&state
->open_states
);
751 spin_unlock(&inode
->i_lock
);
752 spin_unlock(&owner
->so_lock
);
754 nfs4_free_open_state(state
);
755 nfs4_put_state_owner(owner
);
759 * Close the current file.
761 static void __nfs4_close(struct nfs4_state
*state
,
762 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
764 struct nfs4_state_owner
*owner
= state
->owner
;
768 atomic_inc(&owner
->so_count
);
769 /* Protect against nfs4_find_state() */
770 spin_lock(&owner
->so_lock
);
771 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
778 case FMODE_READ
|FMODE_WRITE
:
781 newstate
= FMODE_READ
|FMODE_WRITE
;
782 if (state
->n_rdwr
== 0) {
783 if (state
->n_rdonly
== 0) {
784 newstate
&= ~FMODE_READ
;
785 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
786 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
788 if (state
->n_wronly
== 0) {
789 newstate
&= ~FMODE_WRITE
;
790 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
791 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
794 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
796 nfs4_state_set_mode_locked(state
, newstate
);
797 spin_unlock(&owner
->so_lock
);
800 nfs4_put_open_state(state
);
801 nfs4_put_state_owner(owner
);
803 nfs4_do_close(state
, gfp_mask
, wait
);
806 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
808 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
811 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
813 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
817 * Search the state->lock_states for an existing lock_owner
818 * that is compatible with either of the given owners.
819 * If the second is non-zero, then the first refers to a Posix-lock
820 * owner (current->files) and the second refers to a flock/OFD
821 * owner (struct file*). In that case, prefer a match for the first
823 * If both sorts of locks are held on the one file we cannot know
824 * which stateid was intended to be used, so a "correct" choice cannot
825 * be made. Failing that, a "consistent" choice is preferable. The
826 * consistent choice we make is to prefer the first owner, that of a
829 static struct nfs4_lock_state
*
830 __nfs4_find_lock_state(struct nfs4_state
*state
,
831 fl_owner_t fl_owner
, fl_owner_t fl_owner2
)
833 struct nfs4_lock_state
*pos
, *ret
= NULL
;
834 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
835 if (pos
->ls_owner
== fl_owner
) {
839 if (pos
->ls_owner
== fl_owner2
)
843 refcount_inc(&ret
->ls_count
);
848 * Return a compatible lock_state. If no initialized lock_state structure
849 * exists, return an uninitialized one.
852 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
854 struct nfs4_lock_state
*lsp
;
855 struct nfs_server
*server
= state
->owner
->so_server
;
857 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
860 nfs4_init_seqid_counter(&lsp
->ls_seqid
);
861 refcount_set(&lsp
->ls_count
, 1);
862 lsp
->ls_state
= state
;
863 lsp
->ls_owner
= fl_owner
;
864 lsp
->ls_seqid
.owner_id
= ida_simple_get(&server
->lockowner_id
, 0, 0, GFP_NOFS
);
865 if (lsp
->ls_seqid
.owner_id
< 0)
867 INIT_LIST_HEAD(&lsp
->ls_locks
);
874 void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
)
876 ida_simple_remove(&server
->lockowner_id
, lsp
->ls_seqid
.owner_id
);
877 nfs4_destroy_seqid_counter(&lsp
->ls_seqid
);
882 * Return a compatible lock_state. If no initialized lock_state structure
883 * exists, return an uninitialized one.
886 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
888 struct nfs4_lock_state
*lsp
, *new = NULL
;
891 spin_lock(&state
->state_lock
);
892 lsp
= __nfs4_find_lock_state(state
, owner
, NULL
);
896 list_add(&new->ls_locks
, &state
->lock_states
);
897 set_bit(LK_STATE_IN_USE
, &state
->flags
);
902 spin_unlock(&state
->state_lock
);
903 new = nfs4_alloc_lock_state(state
, owner
);
907 spin_unlock(&state
->state_lock
);
909 nfs4_free_lock_state(state
->owner
->so_server
, new);
914 * Release reference to lock_state, and free it if we see that
915 * it is no longer in use
917 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
919 struct nfs_server
*server
;
920 struct nfs4_state
*state
;
924 state
= lsp
->ls_state
;
925 if (!refcount_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
927 list_del(&lsp
->ls_locks
);
928 if (list_empty(&state
->lock_states
))
929 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
930 spin_unlock(&state
->state_lock
);
931 server
= state
->owner
->so_server
;
932 if (test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
)) {
933 struct nfs_client
*clp
= server
->nfs_client
;
935 clp
->cl_mvops
->free_lock_state(server
, lsp
);
937 nfs4_free_lock_state(server
, lsp
);
940 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
942 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
944 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
945 refcount_inc(&lsp
->ls_count
);
948 static void nfs4_fl_release_lock(struct file_lock
*fl
)
950 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
953 static const struct file_lock_operations nfs4_fl_lock_ops
= {
954 .fl_copy_lock
= nfs4_fl_copy_lock
,
955 .fl_release_private
= nfs4_fl_release_lock
,
958 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
960 struct nfs4_lock_state
*lsp
;
962 if (fl
->fl_ops
!= NULL
)
964 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
967 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
968 fl
->fl_ops
= &nfs4_fl_lock_ops
;
972 static int nfs4_copy_lock_stateid(nfs4_stateid
*dst
,
973 struct nfs4_state
*state
,
974 const struct nfs_lock_context
*l_ctx
)
976 struct nfs4_lock_state
*lsp
;
977 fl_owner_t fl_owner
, fl_flock_owner
;
983 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
986 fl_owner
= l_ctx
->lockowner
;
987 fl_flock_owner
= l_ctx
->open_context
->flock_owner
;
989 spin_lock(&state
->state_lock
);
990 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_flock_owner
);
991 if (lsp
&& test_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
))
993 else if (lsp
!= NULL
&& test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
) != 0) {
994 nfs4_stateid_copy(dst
, &lsp
->ls_stateid
);
997 spin_unlock(&state
->state_lock
);
998 nfs4_put_lock_state(lsp
);
1003 bool nfs4_refresh_open_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
)
1010 seq
= read_seqbegin(&state
->seqlock
);
1011 if (nfs4_state_match_open_stateid_other(state
, dst
)) {
1012 dst
->seqid
= state
->open_stateid
.seqid
;
1015 } while (read_seqretry(&state
->seqlock
, seq
));
1019 bool nfs4_copy_open_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
)
1022 const nfs4_stateid
*src
;
1027 src
= &zero_stateid
;
1028 seq
= read_seqbegin(&state
->seqlock
);
1029 if (test_bit(NFS_OPEN_STATE
, &state
->flags
)) {
1030 src
= &state
->open_stateid
;
1033 nfs4_stateid_copy(dst
, src
);
1034 } while (read_seqretry(&state
->seqlock
, seq
));
1039 * Byte-range lock aware utility to initialize the stateid of read/write
1042 int nfs4_select_rw_stateid(struct nfs4_state
*state
,
1043 fmode_t fmode
, const struct nfs_lock_context
*l_ctx
,
1044 nfs4_stateid
*dst
, const struct cred
**cred
)
1048 if (!nfs4_valid_open_stateid(state
))
1052 ret
= nfs4_copy_lock_stateid(dst
, state
, l_ctx
);
1054 /* A lost lock - don't even consider delegations */
1056 /* returns true if delegation stateid found and copied */
1057 if (nfs4_copy_delegation_stateid(state
->inode
, fmode
, dst
, cred
)) {
1062 /* nfs4_copy_delegation_stateid() didn't over-write
1063 * dst, so it still has the lock stateid which we now
1067 ret
= nfs4_copy_open_stateid(dst
, state
) ? 0 : -EAGAIN
;
1069 if (nfs_server_capable(state
->inode
, NFS_CAP_STATEID_NFSV41
))
1074 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
1076 struct nfs_seqid
*new;
1078 new = kmalloc(sizeof(*new), gfp_mask
);
1080 return ERR_PTR(-ENOMEM
);
1081 new->sequence
= counter
;
1082 INIT_LIST_HEAD(&new->list
);
1087 void nfs_release_seqid(struct nfs_seqid
*seqid
)
1089 struct nfs_seqid_counter
*sequence
;
1091 if (seqid
== NULL
|| list_empty(&seqid
->list
))
1093 sequence
= seqid
->sequence
;
1094 spin_lock(&sequence
->lock
);
1095 list_del_init(&seqid
->list
);
1096 if (!list_empty(&sequence
->list
)) {
1097 struct nfs_seqid
*next
;
1099 next
= list_first_entry(&sequence
->list
,
1100 struct nfs_seqid
, list
);
1101 rpc_wake_up_queued_task(&sequence
->wait
, next
->task
);
1103 spin_unlock(&sequence
->lock
);
1106 void nfs_free_seqid(struct nfs_seqid
*seqid
)
1108 nfs_release_seqid(seqid
);
1113 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1114 * failed with a seqid incrementing error -
1115 * see comments nfs4.h:seqid_mutating_error()
1117 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
1122 case -NFS4ERR_BAD_SEQID
:
1123 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
1125 pr_warn_ratelimited("NFS: v4 server returned a bad"
1126 " sequence-id error on an"
1127 " unconfirmed sequence %p!\n",
1129 case -NFS4ERR_STALE_CLIENTID
:
1130 case -NFS4ERR_STALE_STATEID
:
1131 case -NFS4ERR_BAD_STATEID
:
1132 case -NFS4ERR_BADXDR
:
1133 case -NFS4ERR_RESOURCE
:
1134 case -NFS4ERR_NOFILEHANDLE
:
1135 case -NFS4ERR_MOVED
:
1136 /* Non-seqid mutating errors */
1140 * Note: no locking needed as we are guaranteed to be first
1141 * on the sequence list
1143 seqid
->sequence
->counter
++;
1146 void nfs_increment_open_seqid(int status
, struct nfs_seqid
*seqid
)
1148 struct nfs4_state_owner
*sp
;
1153 sp
= container_of(seqid
->sequence
, struct nfs4_state_owner
, so_seqid
);
1154 if (status
== -NFS4ERR_BAD_SEQID
)
1155 nfs4_reset_state_owner(sp
);
1156 if (!nfs4_has_session(sp
->so_server
->nfs_client
))
1157 nfs_increment_seqid(status
, seqid
);
1161 * Increment the seqid if the LOCK/LOCKU succeeded, or
1162 * failed with a seqid incrementing error -
1163 * see comments nfs4.h:seqid_mutating_error()
1165 void nfs_increment_lock_seqid(int status
, struct nfs_seqid
*seqid
)
1168 nfs_increment_seqid(status
, seqid
);
1171 int nfs_wait_on_sequence(struct nfs_seqid
*seqid
, struct rpc_task
*task
)
1173 struct nfs_seqid_counter
*sequence
;
1178 sequence
= seqid
->sequence
;
1179 spin_lock(&sequence
->lock
);
1181 if (list_empty(&seqid
->list
))
1182 list_add_tail(&seqid
->list
, &sequence
->list
);
1183 if (list_first_entry(&sequence
->list
, struct nfs_seqid
, list
) == seqid
)
1185 rpc_sleep_on(&sequence
->wait
, task
, NULL
);
1188 spin_unlock(&sequence
->lock
);
1193 static int nfs4_run_state_manager(void *);
1195 static void nfs4_clear_state_manager_bit(struct nfs_client
*clp
)
1197 smp_mb__before_atomic();
1198 clear_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
);
1199 smp_mb__after_atomic();
1200 wake_up_bit(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
);
1201 rpc_wake_up(&clp
->cl_rpcwaitq
);
1205 * Schedule the nfs_client asynchronous state management routine
1207 void nfs4_schedule_state_manager(struct nfs_client
*clp
)
1209 struct task_struct
*task
;
1210 char buf
[INET6_ADDRSTRLEN
+ sizeof("-manager") + 1];
1212 set_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
1213 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
1215 __module_get(THIS_MODULE
);
1216 refcount_inc(&clp
->cl_count
);
1218 /* The rcu_read_lock() is not strictly necessary, as the state
1219 * manager is the only thread that ever changes the rpc_xprt
1220 * after it's initialized. At this point, we're single threaded. */
1222 snprintf(buf
, sizeof(buf
), "%s-manager",
1223 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_ADDR
));
1225 task
= kthread_run(nfs4_run_state_manager
, clp
, "%s", buf
);
1227 printk(KERN_ERR
"%s: kthread_run: %ld\n",
1228 __func__
, PTR_ERR(task
));
1229 nfs4_clear_state_manager_bit(clp
);
1230 nfs_put_client(clp
);
1231 module_put(THIS_MODULE
);
1236 * Schedule a lease recovery attempt
1238 void nfs4_schedule_lease_recovery(struct nfs_client
*clp
)
1242 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1243 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1244 dprintk("%s: scheduling lease recovery for server %s\n", __func__
,
1246 nfs4_schedule_state_manager(clp
);
1248 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery
);
1251 * nfs4_schedule_migration_recovery - trigger migration recovery
1253 * @server: FSID that is migrating
1255 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1256 * value is returned.
1258 int nfs4_schedule_migration_recovery(const struct nfs_server
*server
)
1260 struct nfs_client
*clp
= server
->nfs_client
;
1262 if (server
->fh_expire_type
!= NFS4_FH_PERSISTENT
) {
1263 pr_err("NFS: volatile file handles not supported (server %s)\n",
1268 if (test_bit(NFS_MIG_FAILED
, &server
->mig_status
))
1271 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1273 (unsigned long long)server
->fsid
.major
,
1274 (unsigned long long)server
->fsid
.minor
,
1277 set_bit(NFS_MIG_IN_TRANSITION
,
1278 &((struct nfs_server
*)server
)->mig_status
);
1279 set_bit(NFS4CLNT_MOVED
, &clp
->cl_state
);
1281 nfs4_schedule_state_manager(clp
);
1284 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery
);
1287 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1289 * @clp: server to check for moved leases
1292 void nfs4_schedule_lease_moved_recovery(struct nfs_client
*clp
)
1294 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1295 __func__
, clp
->cl_clientid
, clp
->cl_hostname
);
1297 set_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
);
1298 nfs4_schedule_state_manager(clp
);
1300 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery
);
1302 int nfs4_wait_clnt_recover(struct nfs_client
*clp
)
1308 refcount_inc(&clp
->cl_count
);
1309 res
= wait_on_bit_action(&clp
->cl_state
, NFS4CLNT_MANAGER_RUNNING
,
1310 nfs_wait_bit_killable
, TASK_KILLABLE
);
1313 if (clp
->cl_cons_state
< 0)
1314 res
= clp
->cl_cons_state
;
1316 nfs_put_client(clp
);
1320 int nfs4_client_recover_expired_lease(struct nfs_client
*clp
)
1325 for (loop
= NFS4_MAX_LOOP_ON_RECOVER
; loop
!= 0; loop
--) {
1326 ret
= nfs4_wait_clnt_recover(clp
);
1329 if (!test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) &&
1330 !test_bit(NFS4CLNT_CHECK_LEASE
,&clp
->cl_state
))
1332 nfs4_schedule_state_manager(clp
);
1339 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1340 * @clp: client to process
1342 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1343 * resend of the SETCLIENTID and hence re-establish the
1344 * callback channel. Then return all existing delegations.
1346 static void nfs40_handle_cb_pathdown(struct nfs_client
*clp
)
1348 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1349 nfs_expire_all_delegations(clp
);
1350 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__
,
1354 void nfs4_schedule_path_down_recovery(struct nfs_client
*clp
)
1356 nfs40_handle_cb_pathdown(clp
);
1357 nfs4_schedule_state_manager(clp
);
1360 static int nfs4_state_mark_reclaim_reboot(struct nfs_client
*clp
, struct nfs4_state
*state
)
1363 if (!nfs4_valid_open_stateid(state
))
1365 set_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1366 /* Don't recover state that expired before the reboot */
1367 if (test_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
)) {
1368 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1371 set_bit(NFS_OWNER_RECLAIM_REBOOT
, &state
->owner
->so_flags
);
1372 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1376 int nfs4_state_mark_reclaim_nograce(struct nfs_client
*clp
, struct nfs4_state
*state
)
1378 if (!nfs4_valid_open_stateid(state
))
1380 set_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1381 clear_bit(NFS_STATE_RECLAIM_REBOOT
, &state
->flags
);
1382 set_bit(NFS_OWNER_RECLAIM_NOGRACE
, &state
->owner
->so_flags
);
1383 set_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
1387 int nfs4_schedule_stateid_recovery(const struct nfs_server
*server
, struct nfs4_state
*state
)
1389 struct nfs_client
*clp
= server
->nfs_client
;
1391 if (!nfs4_state_mark_reclaim_nograce(clp
, state
))
1393 nfs_inode_find_delegation_state_and_recover(state
->inode
,
1395 dprintk("%s: scheduling stateid recovery for server %s\n", __func__
,
1397 nfs4_schedule_state_manager(clp
);
1400 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery
);
1402 static struct nfs4_lock_state
*
1403 nfs_state_find_lock_state_by_stateid(struct nfs4_state
*state
,
1404 const nfs4_stateid
*stateid
)
1406 struct nfs4_lock_state
*pos
;
1408 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
1409 if (!test_bit(NFS_LOCK_INITIALIZED
, &pos
->ls_flags
))
1411 if (nfs4_stateid_match_other(&pos
->ls_stateid
, stateid
))
1417 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state
*state
,
1418 const nfs4_stateid
*stateid
)
1422 if (test_bit(LK_STATE_IN_USE
, &state
->flags
)) {
1423 spin_lock(&state
->state_lock
);
1424 if (nfs_state_find_lock_state_by_stateid(state
, stateid
))
1426 spin_unlock(&state
->state_lock
);
1431 void nfs_inode_find_state_and_recover(struct inode
*inode
,
1432 const nfs4_stateid
*stateid
)
1434 struct nfs_client
*clp
= NFS_SERVER(inode
)->nfs_client
;
1435 struct nfs_inode
*nfsi
= NFS_I(inode
);
1436 struct nfs_open_context
*ctx
;
1437 struct nfs4_state
*state
;
1441 list_for_each_entry_rcu(ctx
, &nfsi
->open_files
, list
) {
1445 if (nfs4_stateid_match_other(&state
->stateid
, stateid
) &&
1446 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1450 if (nfs4_stateid_match_other(&state
->open_stateid
, stateid
) &&
1451 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1455 if (nfs_state_lock_state_matches_stateid(state
, stateid
) &&
1456 nfs4_state_mark_reclaim_nograce(clp
, state
))
1461 nfs_inode_find_delegation_state_and_recover(inode
, stateid
);
1463 nfs4_schedule_state_manager(clp
);
1466 static void nfs4_state_mark_open_context_bad(struct nfs4_state
*state
)
1468 struct inode
*inode
= state
->inode
;
1469 struct nfs_inode
*nfsi
= NFS_I(inode
);
1470 struct nfs_open_context
*ctx
;
1473 list_for_each_entry_rcu(ctx
, &nfsi
->open_files
, list
) {
1474 if (ctx
->state
!= state
)
1476 set_bit(NFS_CONTEXT_BAD
, &ctx
->flags
);
1481 static void nfs4_state_mark_recovery_failed(struct nfs4_state
*state
, int error
)
1483 set_bit(NFS_STATE_RECOVERY_FAILED
, &state
->flags
);
1484 nfs4_state_mark_open_context_bad(state
);
1488 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1490 struct inode
*inode
= state
->inode
;
1491 struct nfs_inode
*nfsi
= NFS_I(inode
);
1492 struct file_lock
*fl
;
1493 struct nfs4_lock_state
*lsp
;
1495 struct file_lock_context
*flctx
= inode
->i_flctx
;
1496 struct list_head
*list
;
1501 list
= &flctx
->flc_posix
;
1503 /* Guard against delegation returns and new lock/unlock calls */
1504 down_write(&nfsi
->rwsem
);
1505 spin_lock(&flctx
->flc_lock
);
1507 list_for_each_entry(fl
, list
, fl_list
) {
1508 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1510 spin_unlock(&flctx
->flc_lock
);
1511 status
= ops
->recover_lock(state
, fl
);
1516 case -NFS4ERR_ADMIN_REVOKED
:
1517 case -NFS4ERR_STALE_STATEID
:
1518 case -NFS4ERR_BAD_STATEID
:
1519 case -NFS4ERR_EXPIRED
:
1520 case -NFS4ERR_NO_GRACE
:
1521 case -NFS4ERR_STALE_CLIENTID
:
1522 case -NFS4ERR_BADSESSION
:
1523 case -NFS4ERR_BADSLOT
:
1524 case -NFS4ERR_BAD_HIGH_SLOT
:
1525 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1528 pr_err("NFS: %s: unhandled error %d\n",
1532 case -NFS4ERR_DENIED
:
1533 case -NFS4ERR_RECLAIM_BAD
:
1534 case -NFS4ERR_RECLAIM_CONFLICT
:
1535 lsp
= fl
->fl_u
.nfs4_fl
.owner
;
1537 set_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
);
1540 spin_lock(&flctx
->flc_lock
);
1542 if (list
== &flctx
->flc_posix
) {
1543 list
= &flctx
->flc_flock
;
1546 spin_unlock(&flctx
->flc_lock
);
1548 up_write(&nfsi
->rwsem
);
1552 #ifdef CONFIG_NFS_V4_2
1553 static void nfs42_complete_copies(struct nfs4_state_owner
*sp
, struct nfs4_state
*state
)
1555 struct nfs4_copy_state
*copy
;
1557 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE
, &state
->flags
))
1560 spin_lock(&sp
->so_server
->nfs_client
->cl_lock
);
1561 list_for_each_entry(copy
, &sp
->so_server
->ss_copies
, copies
) {
1562 if (!nfs4_stateid_match_other(&state
->stateid
, ©
->parent_state
->stateid
))
1565 complete(©
->completion
);
1568 spin_unlock(&sp
->so_server
->nfs_client
->cl_lock
);
1570 #else /* !CONFIG_NFS_V4_2 */
1571 static inline void nfs42_complete_copies(struct nfs4_state_owner
*sp
,
1572 struct nfs4_state
*state
)
1575 #endif /* CONFIG_NFS_V4_2 */
1577 static int __nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, struct nfs4_state
*state
,
1578 const struct nfs4_state_recovery_ops
*ops
)
1580 struct nfs4_lock_state
*lock
;
1583 status
= ops
->recover_open(sp
, state
);
1587 status
= nfs4_reclaim_locks(state
, ops
);
1591 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
)) {
1592 spin_lock(&state
->state_lock
);
1593 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1594 if (!test_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
))
1595 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__
);
1597 spin_unlock(&state
->state_lock
);
1600 nfs42_complete_copies(sp
, state
);
1601 clear_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1605 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1607 struct nfs4_state
*state
;
1610 /* Note: we rely on the sp->so_states list being ordered
1611 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1613 * This is needed to ensure that the server won't give us any
1614 * read delegations that we have to return if, say, we are
1615 * recovering after a network partition or a reboot from a
1616 * server that doesn't support a grace period.
1618 spin_lock(&sp
->so_lock
);
1619 raw_write_seqcount_begin(&sp
->so_reclaim_seqcount
);
1621 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1622 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1624 if (!nfs4_valid_open_stateid(state
))
1626 if (state
->state
== 0)
1628 refcount_inc(&state
->count
);
1629 spin_unlock(&sp
->so_lock
);
1630 status
= __nfs4_reclaim_open_state(sp
, state
, ops
);
1636 printk(KERN_ERR
"NFS: %s: unhandled error %d\n", __func__
, status
);
1644 /* Open state on this file cannot be recovered */
1645 nfs4_state_mark_recovery_failed(state
, status
);
1650 case -NFS4ERR_ADMIN_REVOKED
:
1651 case -NFS4ERR_STALE_STATEID
:
1652 case -NFS4ERR_OLD_STATEID
:
1653 case -NFS4ERR_BAD_STATEID
:
1654 case -NFS4ERR_RECLAIM_BAD
:
1655 case -NFS4ERR_RECLAIM_CONFLICT
:
1656 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1658 case -NFS4ERR_EXPIRED
:
1659 case -NFS4ERR_NO_GRACE
:
1660 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1661 case -NFS4ERR_STALE_CLIENTID
:
1662 case -NFS4ERR_BADSESSION
:
1663 case -NFS4ERR_BADSLOT
:
1664 case -NFS4ERR_BAD_HIGH_SLOT
:
1665 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1668 nfs4_put_open_state(state
);
1669 spin_lock(&sp
->so_lock
);
1672 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1673 spin_unlock(&sp
->so_lock
);
1676 nfs4_put_open_state(state
);
1677 spin_lock(&sp
->so_lock
);
1678 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1679 spin_unlock(&sp
->so_lock
);
1683 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1685 struct nfs4_lock_state
*lock
;
1687 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1688 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1689 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1690 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1691 spin_lock(&state
->state_lock
);
1692 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1693 lock
->ls_seqid
.flags
= 0;
1694 clear_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
);
1696 spin_unlock(&state
->state_lock
);
1699 static void nfs4_reset_seqids(struct nfs_server
*server
,
1700 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1702 struct nfs_client
*clp
= server
->nfs_client
;
1703 struct nfs4_state_owner
*sp
;
1704 struct rb_node
*pos
;
1705 struct nfs4_state
*state
;
1707 spin_lock(&clp
->cl_lock
);
1708 for (pos
= rb_first(&server
->state_owners
);
1710 pos
= rb_next(pos
)) {
1711 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1712 sp
->so_seqid
.flags
= 0;
1713 spin_lock(&sp
->so_lock
);
1714 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1715 if (mark_reclaim(clp
, state
))
1716 nfs4_clear_open_state(state
);
1718 spin_unlock(&sp
->so_lock
);
1720 spin_unlock(&clp
->cl_lock
);
1723 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1724 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1726 struct nfs_server
*server
;
1729 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1730 nfs4_reset_seqids(server
, mark_reclaim
);
1734 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1736 /* Mark all delegations for reclaim */
1737 nfs_delegation_mark_reclaim(clp
);
1738 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1741 static int nfs4_reclaim_complete(struct nfs_client
*clp
,
1742 const struct nfs4_state_recovery_ops
*ops
,
1743 const struct cred
*cred
)
1745 /* Notify the server we're done reclaiming our state */
1746 if (ops
->reclaim_complete
)
1747 return ops
->reclaim_complete(clp
, cred
);
1751 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1753 struct nfs_client
*clp
= server
->nfs_client
;
1754 struct nfs4_state_owner
*sp
;
1755 struct rb_node
*pos
;
1756 struct nfs4_state
*state
;
1758 spin_lock(&clp
->cl_lock
);
1759 for (pos
= rb_first(&server
->state_owners
);
1761 pos
= rb_next(pos
)) {
1762 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1763 spin_lock(&sp
->so_lock
);
1764 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1765 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1768 nfs4_state_mark_reclaim_nograce(clp
, state
);
1770 spin_unlock(&sp
->so_lock
);
1772 spin_unlock(&clp
->cl_lock
);
1775 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1777 struct nfs_server
*server
;
1779 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1783 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1784 nfs4_clear_reclaim_server(server
);
1787 nfs_delegation_reap_unclaimed(clp
);
1791 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1793 const struct nfs4_state_recovery_ops
*ops
;
1794 const struct cred
*cred
;
1797 if (!nfs4_state_clear_reclaim_reboot(clp
))
1799 ops
= clp
->cl_mvops
->reboot_recovery_ops
;
1800 cred
= nfs4_get_clid_cred(clp
);
1801 err
= nfs4_reclaim_complete(clp
, ops
, cred
);
1803 if (err
== -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
)
1804 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1807 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1809 nfs_mark_test_expired_all_delegations(clp
);
1810 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1813 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1818 case -NFS4ERR_CB_PATH_DOWN
:
1819 nfs40_handle_cb_pathdown(clp
);
1821 case -NFS4ERR_NO_GRACE
:
1822 nfs4_state_end_reclaim_reboot(clp
);
1824 case -NFS4ERR_STALE_CLIENTID
:
1825 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1826 nfs4_state_start_reclaim_reboot(clp
);
1828 case -NFS4ERR_EXPIRED
:
1829 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1830 nfs4_state_start_reclaim_nograce(clp
);
1832 case -NFS4ERR_BADSESSION
:
1833 case -NFS4ERR_BADSLOT
:
1834 case -NFS4ERR_BAD_HIGH_SLOT
:
1835 case -NFS4ERR_DEADSESSION
:
1836 case -NFS4ERR_SEQ_FALSE_RETRY
:
1837 case -NFS4ERR_SEQ_MISORDERED
:
1838 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1839 /* Zero session reset errors */
1841 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1842 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
1845 dprintk("%s: failed to handle error %d for server %s\n",
1846 __func__
, error
, clp
->cl_hostname
);
1849 dprintk("%s: handled error %d for server %s\n", __func__
, error
,
1854 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1856 struct nfs4_state_owner
*sp
;
1857 struct nfs_server
*server
;
1858 struct rb_node
*pos
;
1863 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1864 nfs4_purge_state_owners(server
);
1865 spin_lock(&clp
->cl_lock
);
1866 for (pos
= rb_first(&server
->state_owners
);
1868 pos
= rb_next(pos
)) {
1870 struct nfs4_state_owner
, so_server_node
);
1871 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1874 if (!atomic_inc_not_zero(&sp
->so_count
))
1876 spin_unlock(&clp
->cl_lock
);
1879 status
= nfs4_reclaim_open_state(sp
, ops
);
1881 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1882 nfs4_put_state_owner(sp
);
1883 status
= nfs4_recovery_handle_error(clp
, status
);
1884 return (status
!= 0) ? status
: -EAGAIN
;
1887 nfs4_put_state_owner(sp
);
1890 spin_unlock(&clp
->cl_lock
);
1896 static int nfs4_check_lease(struct nfs_client
*clp
)
1898 const struct cred
*cred
;
1899 const struct nfs4_state_maintenance_ops
*ops
=
1900 clp
->cl_mvops
->state_renewal_ops
;
1903 /* Is the client already known to have an expired lease? */
1904 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1906 cred
= ops
->get_state_renewal_cred(clp
);
1908 cred
= nfs4_get_clid_cred(clp
);
1913 status
= ops
->renew_lease(clp
, cred
);
1915 if (status
== -ETIMEDOUT
) {
1916 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1920 return nfs4_recovery_handle_error(clp
, status
);
1923 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1924 * and for recoverable errors on EXCHANGE_ID for v4.1
1926 static int nfs4_handle_reclaim_lease_error(struct nfs_client
*clp
, int status
)
1929 case -NFS4ERR_SEQ_MISORDERED
:
1930 if (test_and_set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
))
1931 return -ESERVERFAULT
;
1932 /* Lease confirmation error: retry after purging the lease */
1934 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1936 case -NFS4ERR_STALE_CLIENTID
:
1937 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1938 nfs4_state_start_reclaim_reboot(clp
);
1940 case -NFS4ERR_CLID_INUSE
:
1941 pr_err("NFS: Server %s reports our clientid is in use\n",
1943 nfs_mark_client_ready(clp
, -EPERM
);
1944 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1947 case -NFS4ERR_DELAY
:
1953 case -NFS4ERR_MINOR_VERS_MISMATCH
:
1954 if (clp
->cl_cons_state
== NFS_CS_SESSION_INITING
)
1955 nfs_mark_client_ready(clp
, -EPROTONOSUPPORT
);
1956 dprintk("%s: exit with error %d for server %s\n",
1957 __func__
, -EPROTONOSUPPORT
, clp
->cl_hostname
);
1958 return -EPROTONOSUPPORT
;
1959 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
1960 * in nfs4_exchange_id */
1962 dprintk("%s: exit with error %d for server %s\n", __func__
,
1963 status
, clp
->cl_hostname
);
1966 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1967 dprintk("%s: handled error %d for server %s\n", __func__
, status
,
1972 static int nfs4_establish_lease(struct nfs_client
*clp
)
1974 const struct cred
*cred
;
1975 const struct nfs4_state_recovery_ops
*ops
=
1976 clp
->cl_mvops
->reboot_recovery_ops
;
1979 status
= nfs4_begin_drain_session(clp
);
1982 cred
= nfs4_get_clid_cred(clp
);
1985 status
= ops
->establish_clid(clp
, cred
);
1989 pnfs_destroy_all_layouts(clp
);
1994 * Returns zero or a negative errno. NFS4ERR values are converted
1995 * to local errno values.
1997 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
2001 status
= nfs4_establish_lease(clp
);
2003 return nfs4_handle_reclaim_lease_error(clp
, status
);
2004 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
, &clp
->cl_state
))
2005 nfs4_state_start_reclaim_nograce(clp
);
2006 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
2007 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
2008 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2009 clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
2013 static int nfs4_purge_lease(struct nfs_client
*clp
)
2017 status
= nfs4_establish_lease(clp
);
2019 return nfs4_handle_reclaim_lease_error(clp
, status
);
2020 clear_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2021 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
2022 nfs4_state_start_reclaim_nograce(clp
);
2027 * Try remote migration of one FSID from a source server to a
2028 * destination server. The source server provides a list of
2029 * potential destinations.
2031 * Returns zero or a negative NFS4ERR status code.
2033 static int nfs4_try_migration(struct nfs_server
*server
, const struct cred
*cred
)
2035 struct nfs_client
*clp
= server
->nfs_client
;
2036 struct nfs4_fs_locations
*locations
= NULL
;
2037 struct inode
*inode
;
2041 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__
,
2042 (unsigned long long)server
->fsid
.major
,
2043 (unsigned long long)server
->fsid
.minor
,
2047 page
= alloc_page(GFP_KERNEL
);
2048 locations
= kmalloc(sizeof(struct nfs4_fs_locations
), GFP_KERNEL
);
2049 if (page
== NULL
|| locations
== NULL
) {
2050 dprintk("<-- %s: no memory\n", __func__
);
2054 inode
= d_inode(server
->super
->s_root
);
2055 result
= nfs4_proc_get_locations(inode
, locations
, page
, cred
);
2057 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2062 result
= -NFS4ERR_NXIO
;
2063 if (!(locations
->fattr
.valid
& NFS_ATTR_FATTR_V4_LOCATIONS
)) {
2064 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2069 status
= nfs4_begin_drain_session(clp
);
2073 status
= nfs4_replace_transport(server
, locations
);
2075 dprintk("<-- %s: failed to replace transport: %d\n",
2081 dprintk("<-- %s: migration succeeded\n", __func__
);
2088 pr_err("NFS: migration recovery failed (server %s)\n",
2090 set_bit(NFS_MIG_FAILED
, &server
->mig_status
);
2096 * Returns zero or a negative NFS4ERR status code.
2098 static int nfs4_handle_migration(struct nfs_client
*clp
)
2100 const struct nfs4_state_maintenance_ops
*ops
=
2101 clp
->cl_mvops
->state_renewal_ops
;
2102 struct nfs_server
*server
;
2103 const struct cred
*cred
;
2105 dprintk("%s: migration reported on \"%s\"\n", __func__
,
2108 cred
= ops
->get_state_renewal_cred(clp
);
2110 return -NFS4ERR_NOENT
;
2115 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2118 if (server
->mig_gen
== clp
->cl_mig_gen
)
2120 server
->mig_gen
= clp
->cl_mig_gen
;
2122 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION
,
2123 &server
->mig_status
))
2127 status
= nfs4_try_migration(server
, cred
);
2140 * Test each nfs_server on the clp's cl_superblocks list to see
2141 * if it's moved to another server. Stop when the server no longer
2142 * returns NFS4ERR_LEASE_MOVED.
2144 static int nfs4_handle_lease_moved(struct nfs_client
*clp
)
2146 const struct nfs4_state_maintenance_ops
*ops
=
2147 clp
->cl_mvops
->state_renewal_ops
;
2148 struct nfs_server
*server
;
2149 const struct cred
*cred
;
2151 dprintk("%s: lease moved reported on \"%s\"\n", __func__
,
2154 cred
= ops
->get_state_renewal_cred(clp
);
2156 return -NFS4ERR_NOENT
;
2161 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2162 struct inode
*inode
;
2165 if (server
->mig_gen
== clp
->cl_mig_gen
)
2167 server
->mig_gen
= clp
->cl_mig_gen
;
2171 inode
= d_inode(server
->super
->s_root
);
2172 status
= nfs4_proc_fsid_present(inode
, cred
);
2173 if (status
!= -NFS4ERR_MOVED
)
2174 goto restart
; /* wasn't this one */
2175 if (nfs4_try_migration(server
, cred
) == -NFS4ERR_LEASE_MOVED
)
2176 goto restart
; /* there are more */
2187 * nfs4_discover_server_trunking - Detect server IP address trunking
2189 * @clp: nfs_client under test
2190 * @result: OUT: found nfs_client, or clp
2192 * Returns zero or a negative errno. If zero is returned,
2193 * an nfs_client pointer is planted in "result".
2195 * Note: since we are invoked in process context, and
2196 * not from inside the state manager, we cannot use
2197 * nfs4_handle_reclaim_lease_error().
2199 int nfs4_discover_server_trunking(struct nfs_client
*clp
,
2200 struct nfs_client
**result
)
2202 const struct nfs4_state_recovery_ops
*ops
=
2203 clp
->cl_mvops
->reboot_recovery_ops
;
2204 struct rpc_clnt
*clnt
;
2205 const struct cred
*cred
;
2208 dprintk("NFS: %s: testing '%s'\n", __func__
, clp
->cl_hostname
);
2210 clnt
= clp
->cl_rpcclient
;
2213 mutex_lock(&nfs_clid_init_mutex
);
2216 cred
= nfs4_get_clid_cred(clp
);
2220 status
= ops
->detect_trunking(clp
, result
, cred
);
2228 if (clnt
->cl_softrtry
)
2231 case -NFS4ERR_DELAY
:
2235 case -NFS4ERR_STALE_CLIENTID
:
2236 dprintk("NFS: %s after status %d, retrying\n",
2241 nfs4_root_machine_cred(clp
);
2244 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
)
2247 case -NFS4ERR_CLID_INUSE
:
2248 case -NFS4ERR_WRONGSEC
:
2249 /* No point in retrying if we already used RPC_AUTH_UNIX */
2250 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
) {
2254 clnt
= rpc_clone_client_set_auth(clnt
, RPC_AUTH_UNIX
);
2256 status
= PTR_ERR(clnt
);
2259 /* Note: this is safe because we haven't yet marked the
2260 * client as ready, so we are the only user of
2263 clnt
= xchg(&clp
->cl_rpcclient
, clnt
);
2264 rpc_shutdown_client(clnt
);
2265 clnt
= clp
->cl_rpcclient
;
2268 case -NFS4ERR_MINOR_VERS_MISMATCH
:
2269 status
= -EPROTONOSUPPORT
;
2273 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
2274 * in nfs4_exchange_id */
2275 status
= -EKEYEXPIRED
;
2278 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2284 mutex_unlock(&nfs_clid_init_mutex
);
2285 dprintk("NFS: %s: status = %d\n", __func__
, status
);
2289 #ifdef CONFIG_NFS_V4_1
2290 void nfs4_schedule_session_recovery(struct nfs4_session
*session
, int err
)
2292 struct nfs_client
*clp
= session
->clp
;
2296 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2298 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
2299 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2301 nfs4_schedule_state_manager(clp
);
2303 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
2305 void nfs41_notify_server(struct nfs_client
*clp
)
2307 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2308 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2309 nfs4_schedule_state_manager(clp
);
2312 static void nfs4_reset_all_state(struct nfs_client
*clp
)
2314 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2315 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2316 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
2317 nfs4_state_start_reclaim_nograce(clp
);
2318 dprintk("%s: scheduling reset of all state for server %s!\n",
2319 __func__
, clp
->cl_hostname
);
2320 nfs4_schedule_state_manager(clp
);
2324 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
2326 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2327 nfs4_state_start_reclaim_reboot(clp
);
2328 dprintk("%s: server %s rebooted!\n", __func__
,
2330 nfs4_schedule_state_manager(clp
);
2334 static void nfs41_handle_all_state_revoked(struct nfs_client
*clp
)
2336 nfs4_reset_all_state(clp
);
2337 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2340 static void nfs41_handle_some_state_revoked(struct nfs_client
*clp
)
2342 nfs4_state_start_reclaim_nograce(clp
);
2343 nfs4_schedule_state_manager(clp
);
2345 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2348 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
2350 /* FIXME: For now, we destroy all layouts. */
2351 pnfs_destroy_all_layouts(clp
);
2352 nfs_test_expired_all_delegations(clp
);
2353 dprintk("%s: Recallable state revoked on server %s!\n", __func__
,
2357 static void nfs41_handle_backchannel_fault(struct nfs_client
*clp
)
2359 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2360 nfs4_schedule_state_manager(clp
);
2362 dprintk("%s: server %s declared a backchannel fault\n", __func__
,
2366 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
2368 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2369 &clp
->cl_state
) == 0)
2370 nfs4_schedule_state_manager(clp
);
2373 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
,
2379 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2380 __func__
, clp
->cl_hostname
, clp
->cl_clientid
, flags
);
2382 * If we're called from the state manager thread, then assume we're
2383 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2384 * Those flags are expected to remain set until we're done
2385 * recovering (see RFC5661, section 18.46.3).
2390 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
2391 nfs41_handle_server_reboot(clp
);
2392 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
))
2393 nfs41_handle_all_state_revoked(clp
);
2394 if (flags
& (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
2395 SEQ4_STATUS_ADMIN_STATE_REVOKED
))
2396 nfs41_handle_some_state_revoked(clp
);
2397 if (flags
& SEQ4_STATUS_LEASE_MOVED
)
2398 nfs4_schedule_lease_moved_recovery(clp
);
2399 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
2400 nfs41_handle_recallable_state_revoked(clp
);
2402 if (flags
& SEQ4_STATUS_BACKCHANNEL_FAULT
)
2403 nfs41_handle_backchannel_fault(clp
);
2404 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
2405 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
2406 nfs41_handle_cb_path_down(clp
);
2409 static int nfs4_reset_session(struct nfs_client
*clp
)
2411 const struct cred
*cred
;
2414 if (!nfs4_has_session(clp
))
2416 status
= nfs4_begin_drain_session(clp
);
2419 cred
= nfs4_get_clid_cred(clp
);
2420 status
= nfs4_proc_destroy_session(clp
->cl_session
, cred
);
2423 case -NFS4ERR_BADSESSION
:
2424 case -NFS4ERR_DEADSESSION
:
2426 case -NFS4ERR_BACK_CHAN_BUSY
:
2427 case -NFS4ERR_DELAY
:
2428 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2433 status
= nfs4_recovery_handle_error(clp
, status
);
2437 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
2438 status
= nfs4_proc_create_session(clp
, cred
);
2440 dprintk("%s: session reset failed with status %d for server %s!\n",
2441 __func__
, status
, clp
->cl_hostname
);
2442 status
= nfs4_handle_reclaim_lease_error(clp
, status
);
2445 nfs41_finish_session_reset(clp
);
2446 dprintk("%s: session reset was successful for server %s!\n",
2447 __func__
, clp
->cl_hostname
);
2453 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2455 const struct cred
*cred
;
2458 if (!nfs4_has_session(clp
))
2460 ret
= nfs4_begin_drain_session(clp
);
2463 cred
= nfs4_get_clid_cred(clp
);
2464 ret
= nfs4_proc_bind_conn_to_session(clp
, cred
);
2466 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2469 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2470 __func__
, clp
->cl_hostname
);
2472 case -NFS4ERR_DELAY
:
2474 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2477 return nfs4_recovery_handle_error(clp
, ret
);
2481 #else /* CONFIG_NFS_V4_1 */
2482 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
2484 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2488 #endif /* CONFIG_NFS_V4_1 */
2490 static void nfs4_state_manager(struct nfs_client
*clp
)
2493 const char *section
= "", *section_sep
= "";
2495 /* Ensure exclusive access to NFSv4 state */
2497 clear_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
2498 if (test_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
)) {
2499 section
= "purge state";
2500 status
= nfs4_purge_lease(clp
);
2506 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
2507 section
= "lease expired";
2508 /* We're going to have to re-establish a clientid */
2509 status
= nfs4_reclaim_lease(clp
);
2515 /* Initialize or reset the session */
2516 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)) {
2517 section
= "reset session";
2518 status
= nfs4_reset_session(clp
);
2519 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
2525 /* Send BIND_CONN_TO_SESSION */
2526 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2528 section
= "bind conn to session";
2529 status
= nfs4_bind_conn_to_session(clp
);
2535 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
2536 section
= "check lease";
2537 status
= nfs4_check_lease(clp
);
2543 if (test_and_clear_bit(NFS4CLNT_MOVED
, &clp
->cl_state
)) {
2544 section
= "migration";
2545 status
= nfs4_handle_migration(clp
);
2550 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
)) {
2551 section
= "lease moved";
2552 status
= nfs4_handle_lease_moved(clp
);
2557 /* First recover reboot state... */
2558 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
2559 section
= "reclaim reboot";
2560 status
= nfs4_do_reclaim(clp
,
2561 clp
->cl_mvops
->reboot_recovery_ops
);
2562 if (status
== -EAGAIN
)
2566 nfs4_state_end_reclaim_reboot(clp
);
2569 /* Detect expired delegations... */
2570 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED
, &clp
->cl_state
)) {
2571 section
= "detect expired delegations";
2572 nfs_reap_expired_delegations(clp
);
2576 /* Now recover expired state... */
2577 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
2578 section
= "reclaim nograce";
2579 status
= nfs4_do_reclaim(clp
,
2580 clp
->cl_mvops
->nograce_recovery_ops
);
2581 if (status
== -EAGAIN
)
2587 nfs4_end_drain_session(clp
);
2588 nfs4_clear_state_manager_bit(clp
);
2590 if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING
, &clp
->cl_state
)) {
2591 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
2592 nfs_client_return_marked_delegations(clp
);
2593 set_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
2595 clear_bit(NFS4CLNT_DELEGRETURN_RUNNING
, &clp
->cl_state
);
2598 /* Did we race with an attempt to give us more work? */
2599 if (!test_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
))
2601 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
2603 } while (refcount_read(&clp
->cl_count
) > 1 && !signalled());
2607 if (strlen(section
))
2609 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2610 " with error %d\n", section_sep
, section
,
2611 clp
->cl_hostname
, -status
);
2614 nfs4_end_drain_session(clp
);
2615 nfs4_clear_state_manager_bit(clp
);
2618 static int nfs4_run_state_manager(void *ptr
)
2620 struct nfs_client
*clp
= ptr
;
2622 allow_signal(SIGKILL
);
2623 nfs4_state_manager(clp
);
2624 nfs_put_client(clp
);
2625 module_put_and_exit(0);