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"
63 #include "nfs4trace.h"
65 #define NFSDBG_FACILITY NFSDBG_STATE
67 #define OPENOWNER_POOL_SIZE 8
69 const nfs4_stateid zero_stateid
= {
71 .type
= NFS4_SPECIAL_STATEID_TYPE
,
73 const nfs4_stateid invalid_stateid
= {
75 /* Funky initialiser keeps older gcc versions happy */
76 .data
= { 0xff, 0xff, 0xff, 0xff, 0 },
78 .type
= NFS4_INVALID_STATEID_TYPE
,
81 const nfs4_stateid current_stateid
= {
83 /* Funky initialiser keeps older gcc versions happy */
84 .data
= { 0x0, 0x0, 0x0, 0x1, 0 },
86 .type
= NFS4_SPECIAL_STATEID_TYPE
,
89 static DEFINE_MUTEX(nfs_clid_init_mutex
);
91 static int nfs4_setup_state_renewal(struct nfs_client
*clp
)
94 struct nfs_fsinfo fsinfo
;
96 if (!test_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
)) {
97 nfs4_schedule_state_renewal(clp
);
101 status
= nfs4_proc_get_lease_time(clp
, &fsinfo
);
103 nfs4_set_lease_period(clp
, fsinfo
.lease_time
* HZ
);
104 nfs4_schedule_state_renewal(clp
);
110 int nfs4_init_clientid(struct nfs_client
*clp
, const struct cred
*cred
)
112 struct nfs4_setclientid_res clid
= {
113 .clientid
= clp
->cl_clientid
,
114 .confirm
= clp
->cl_confirm
,
118 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
120 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
122 port
= nn
->nfs_callback_tcpport
;
123 if (clp
->cl_addr
.ss_family
== AF_INET6
)
124 port
= nn
->nfs_callback_tcpport6
;
126 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
129 clp
->cl_clientid
= clid
.clientid
;
130 clp
->cl_confirm
= clid
.confirm
;
131 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
133 status
= nfs4_proc_setclientid_confirm(clp
, &clid
, cred
);
136 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
137 nfs4_setup_state_renewal(clp
);
143 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
145 * @clp: nfs_client under test
146 * @result: OUT: found nfs_client, or clp
147 * @cred: credential to use for trunking test
149 * Returns zero, a negative errno, or a negative NFS4ERR status.
150 * If zero is returned, an nfs_client pointer is planted in
153 * Note: The returned client may not yet be marked ready.
155 int nfs40_discover_server_trunking(struct nfs_client
*clp
,
156 struct nfs_client
**result
,
157 const struct cred
*cred
)
159 struct nfs4_setclientid_res clid
= {
160 .clientid
= clp
->cl_clientid
,
161 .confirm
= clp
->cl_confirm
,
163 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
167 port
= nn
->nfs_callback_tcpport
;
168 if (clp
->cl_addr
.ss_family
== AF_INET6
)
169 port
= nn
->nfs_callback_tcpport6
;
171 status
= nfs4_proc_setclientid(clp
, NFS4_CALLBACK
, port
, cred
, &clid
);
174 clp
->cl_clientid
= clid
.clientid
;
175 clp
->cl_confirm
= clid
.confirm
;
177 status
= nfs40_walk_client_list(clp
, result
, cred
);
179 /* Sustain the lease, even if it's empty. If the clientid4
180 * goes stale it's of no use for trunking discovery. */
181 nfs4_schedule_state_renewal(*result
);
183 /* If the client state need to recover, do it. */
185 nfs4_schedule_state_manager(clp
);
191 const struct cred
*nfs4_get_machine_cred(struct nfs_client
*clp
)
193 return get_cred(rpc_machine_cred());
196 static void nfs4_root_machine_cred(struct nfs_client
*clp
)
199 /* Force root creds instead of machine */
200 clp
->cl_principal
= NULL
;
201 clp
->cl_rpcclient
->cl_principal
= NULL
;
204 static const struct cred
*
205 nfs4_get_renew_cred_server_locked(struct nfs_server
*server
)
207 const struct cred
*cred
= NULL
;
208 struct nfs4_state_owner
*sp
;
211 for (pos
= rb_first(&server
->state_owners
);
213 pos
= rb_next(pos
)) {
214 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
215 if (list_empty(&sp
->so_states
))
217 cred
= get_cred(sp
->so_cred
);
224 * nfs4_get_renew_cred - Acquire credential for a renew operation
225 * @clp: client state handle
227 * Returns an rpc_cred with reference count bumped, or NULL.
228 * Caller must hold clp->cl_lock.
230 const struct cred
*nfs4_get_renew_cred(struct nfs_client
*clp
)
232 const struct cred
*cred
= NULL
;
233 struct nfs_server
*server
;
235 /* Use machine credentials if available */
236 cred
= nfs4_get_machine_cred(clp
);
240 spin_lock(&clp
->cl_lock
);
242 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
243 cred
= nfs4_get_renew_cred_server_locked(server
);
248 spin_unlock(&clp
->cl_lock
);
254 static void nfs4_end_drain_slot_table(struct nfs4_slot_table
*tbl
)
256 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
)) {
257 spin_lock(&tbl
->slot_tbl_lock
);
258 nfs41_wake_slot_table(tbl
);
259 spin_unlock(&tbl
->slot_tbl_lock
);
263 static void nfs4_end_drain_session(struct nfs_client
*clp
)
265 struct nfs4_session
*ses
= clp
->cl_session
;
267 if (clp
->cl_slot_tbl
) {
268 nfs4_end_drain_slot_table(clp
->cl_slot_tbl
);
273 nfs4_end_drain_slot_table(&ses
->bc_slot_table
);
274 nfs4_end_drain_slot_table(&ses
->fc_slot_table
);
278 static int nfs4_drain_slot_tbl(struct nfs4_slot_table
*tbl
)
280 set_bit(NFS4_SLOT_TBL_DRAINING
, &tbl
->slot_tbl_state
);
281 spin_lock(&tbl
->slot_tbl_lock
);
282 if (tbl
->highest_used_slotid
!= NFS4_NO_SLOT
) {
283 reinit_completion(&tbl
->complete
);
284 spin_unlock(&tbl
->slot_tbl_lock
);
285 return wait_for_completion_interruptible(&tbl
->complete
);
287 spin_unlock(&tbl
->slot_tbl_lock
);
291 static int nfs4_begin_drain_session(struct nfs_client
*clp
)
293 struct nfs4_session
*ses
= clp
->cl_session
;
296 if (clp
->cl_slot_tbl
)
297 return nfs4_drain_slot_tbl(clp
->cl_slot_tbl
);
300 ret
= nfs4_drain_slot_tbl(&ses
->bc_slot_table
);
304 return nfs4_drain_slot_tbl(&ses
->fc_slot_table
);
307 #if defined(CONFIG_NFS_V4_1)
309 static void nfs41_finish_session_reset(struct nfs_client
*clp
)
311 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
312 clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
313 /* create_session negotiated new slot table */
314 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
315 nfs4_setup_state_renewal(clp
);
318 int nfs41_init_clientid(struct nfs_client
*clp
, const struct cred
*cred
)
322 if (test_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
))
324 status
= nfs4_proc_exchange_id(clp
, cred
);
327 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
329 status
= nfs4_proc_create_session(clp
, cred
);
332 nfs41_finish_session_reset(clp
);
333 nfs_mark_client_ready(clp
, NFS_CS_READY
);
339 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
341 * @clp: nfs_client under test
342 * @result: OUT: found nfs_client, or clp
343 * @cred: credential to use for trunking test
345 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
346 * If NFS4_OK is returned, an nfs_client pointer is planted in
349 * Note: The returned client may not yet be marked ready.
351 int nfs41_discover_server_trunking(struct nfs_client
*clp
,
352 struct nfs_client
**result
,
353 const struct cred
*cred
)
357 status
= nfs4_proc_exchange_id(clp
, cred
);
358 if (status
!= NFS4_OK
)
361 status
= nfs41_walk_client_list(clp
, result
, cred
);
368 * Purge state if the client id was established in a prior
369 * instance and the client id could not have arrived on the
370 * server via Transparent State Migration.
372 if (clp
->cl_exchange_flags
& EXCHGID4_FLAG_CONFIRMED_R
) {
373 if (!test_bit(NFS_CS_TSM_POSSIBLE
, &clp
->cl_flags
))
374 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
376 set_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
378 nfs4_schedule_state_manager(clp
);
379 status
= nfs_wait_client_init_complete(clp
);
385 #endif /* CONFIG_NFS_V4_1 */
388 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
389 * @clp: client state handle
391 * Returns a cred with reference count bumped, or NULL.
393 const struct cred
*nfs4_get_clid_cred(struct nfs_client
*clp
)
395 const struct cred
*cred
;
397 cred
= nfs4_get_machine_cred(clp
);
401 static struct nfs4_state_owner
*
402 nfs4_find_state_owner_locked(struct nfs_server
*server
, const struct cred
*cred
)
404 struct rb_node
**p
= &server
->state_owners
.rb_node
,
406 struct nfs4_state_owner
*sp
;
411 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
412 cmp
= cred_fscmp(cred
, sp
->so_cred
);
415 p
= &parent
->rb_left
;
417 p
= &parent
->rb_right
;
419 if (!list_empty(&sp
->so_lru
))
420 list_del_init(&sp
->so_lru
);
421 atomic_inc(&sp
->so_count
);
428 static struct nfs4_state_owner
*
429 nfs4_insert_state_owner_locked(struct nfs4_state_owner
*new)
431 struct nfs_server
*server
= new->so_server
;
432 struct rb_node
**p
= &server
->state_owners
.rb_node
,
434 struct nfs4_state_owner
*sp
;
439 sp
= rb_entry(parent
, struct nfs4_state_owner
, so_server_node
);
440 cmp
= cred_fscmp(new->so_cred
, sp
->so_cred
);
443 p
= &parent
->rb_left
;
445 p
= &parent
->rb_right
;
447 if (!list_empty(&sp
->so_lru
))
448 list_del_init(&sp
->so_lru
);
449 atomic_inc(&sp
->so_count
);
453 rb_link_node(&new->so_server_node
, parent
, p
);
454 rb_insert_color(&new->so_server_node
, &server
->state_owners
);
459 nfs4_remove_state_owner_locked(struct nfs4_state_owner
*sp
)
461 struct nfs_server
*server
= sp
->so_server
;
463 if (!RB_EMPTY_NODE(&sp
->so_server_node
))
464 rb_erase(&sp
->so_server_node
, &server
->state_owners
);
468 nfs4_init_seqid_counter(struct nfs_seqid_counter
*sc
)
470 sc
->create_time
= ktime_get();
473 spin_lock_init(&sc
->lock
);
474 INIT_LIST_HEAD(&sc
->list
);
475 rpc_init_wait_queue(&sc
->wait
, "Seqid_waitqueue");
479 nfs4_destroy_seqid_counter(struct nfs_seqid_counter
*sc
)
481 rpc_destroy_wait_queue(&sc
->wait
);
485 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
486 * create a new state_owner.
489 static struct nfs4_state_owner
*
490 nfs4_alloc_state_owner(struct nfs_server
*server
,
491 const struct cred
*cred
,
494 struct nfs4_state_owner
*sp
;
496 sp
= kzalloc(sizeof(*sp
), gfp_flags
);
499 sp
->so_seqid
.owner_id
= ida_simple_get(&server
->openowner_id
, 0, 0,
501 if (sp
->so_seqid
.owner_id
< 0) {
505 sp
->so_server
= server
;
506 sp
->so_cred
= get_cred(cred
);
507 spin_lock_init(&sp
->so_lock
);
508 INIT_LIST_HEAD(&sp
->so_states
);
509 nfs4_init_seqid_counter(&sp
->so_seqid
);
510 atomic_set(&sp
->so_count
, 1);
511 INIT_LIST_HEAD(&sp
->so_lru
);
512 seqcount_spinlock_init(&sp
->so_reclaim_seqcount
, &sp
->so_lock
);
513 mutex_init(&sp
->so_delegreturn_mutex
);
518 nfs4_reset_state_owner(struct nfs4_state_owner
*sp
)
520 /* This state_owner is no longer usable, but must
521 * remain in place so that state recovery can find it
522 * and the opens associated with it.
523 * It may also be used for new 'open' request to
524 * return a delegation to the server.
525 * So update the 'create_time' so that it looks like
526 * a new state_owner. This will cause the server to
527 * request an OPEN_CONFIRM to start a new sequence.
529 sp
->so_seqid
.create_time
= ktime_get();
532 static void nfs4_free_state_owner(struct nfs4_state_owner
*sp
)
534 nfs4_destroy_seqid_counter(&sp
->so_seqid
);
535 put_cred(sp
->so_cred
);
536 ida_simple_remove(&sp
->so_server
->openowner_id
, sp
->so_seqid
.owner_id
);
540 static void nfs4_gc_state_owners(struct nfs_server
*server
)
542 struct nfs_client
*clp
= server
->nfs_client
;
543 struct nfs4_state_owner
*sp
, *tmp
;
544 unsigned long time_min
, time_max
;
547 spin_lock(&clp
->cl_lock
);
549 time_min
= (long)time_max
- (long)clp
->cl_lease_time
;
550 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
551 /* NB: LRU is sorted so that oldest is at the head */
552 if (time_in_range(sp
->so_expires
, time_min
, time_max
))
554 list_move(&sp
->so_lru
, &doomed
);
555 nfs4_remove_state_owner_locked(sp
);
557 spin_unlock(&clp
->cl_lock
);
559 list_for_each_entry_safe(sp
, tmp
, &doomed
, so_lru
) {
560 list_del(&sp
->so_lru
);
561 nfs4_free_state_owner(sp
);
566 * nfs4_get_state_owner - Look up a state owner given a credential
567 * @server: nfs_server to search
568 * @cred: RPC credential to match
569 * @gfp_flags: allocation mode
571 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
573 struct nfs4_state_owner
*nfs4_get_state_owner(struct nfs_server
*server
,
574 const struct cred
*cred
,
577 struct nfs_client
*clp
= server
->nfs_client
;
578 struct nfs4_state_owner
*sp
, *new;
580 spin_lock(&clp
->cl_lock
);
581 sp
= nfs4_find_state_owner_locked(server
, cred
);
582 spin_unlock(&clp
->cl_lock
);
585 new = nfs4_alloc_state_owner(server
, cred
, gfp_flags
);
588 spin_lock(&clp
->cl_lock
);
589 sp
= nfs4_insert_state_owner_locked(new);
590 spin_unlock(&clp
->cl_lock
);
592 nfs4_free_state_owner(new);
594 nfs4_gc_state_owners(server
);
599 * nfs4_put_state_owner - Release a nfs4_state_owner
600 * @sp: state owner data to release
602 * Note that we keep released state owners on an LRU
604 * This caches valid state owners so that they can be
605 * reused, to avoid the OPEN_CONFIRM on minor version 0.
606 * It also pins the uniquifier of dropped state owners for
607 * a while, to ensure that those state owner names are
610 void nfs4_put_state_owner(struct nfs4_state_owner
*sp
)
612 struct nfs_server
*server
= sp
->so_server
;
613 struct nfs_client
*clp
= server
->nfs_client
;
615 if (!atomic_dec_and_lock(&sp
->so_count
, &clp
->cl_lock
))
618 sp
->so_expires
= jiffies
;
619 list_add_tail(&sp
->so_lru
, &server
->state_owners_lru
);
620 spin_unlock(&clp
->cl_lock
);
624 * nfs4_purge_state_owners - Release all cached state owners
625 * @server: nfs_server with cached state owners to release
626 * @head: resulting list of state owners
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
630 * Note that the state owners are not freed, but are added
631 * to the list @head, which can later be used as an argument
632 * to nfs4_free_state_owners.
634 void nfs4_purge_state_owners(struct nfs_server
*server
, struct list_head
*head
)
636 struct nfs_client
*clp
= server
->nfs_client
;
637 struct nfs4_state_owner
*sp
, *tmp
;
639 spin_lock(&clp
->cl_lock
);
640 list_for_each_entry_safe(sp
, tmp
, &server
->state_owners_lru
, so_lru
) {
641 list_move(&sp
->so_lru
, head
);
642 nfs4_remove_state_owner_locked(sp
);
644 spin_unlock(&clp
->cl_lock
);
648 * nfs4_free_state_owners - Release all cached state owners
649 * @head: resulting list of state owners
651 * Frees a list of state owners that was generated by
652 * nfs4_purge_state_owners
654 void nfs4_free_state_owners(struct list_head
*head
)
656 struct nfs4_state_owner
*sp
, *tmp
;
658 list_for_each_entry_safe(sp
, tmp
, head
, so_lru
) {
659 list_del(&sp
->so_lru
);
660 nfs4_free_state_owner(sp
);
664 static struct nfs4_state
*
665 nfs4_alloc_open_state(void)
667 struct nfs4_state
*state
;
669 state
= kzalloc(sizeof(*state
), GFP_NOFS
);
672 refcount_set(&state
->count
, 1);
673 INIT_LIST_HEAD(&state
->lock_states
);
674 spin_lock_init(&state
->state_lock
);
675 seqlock_init(&state
->seqlock
);
676 init_waitqueue_head(&state
->waitq
);
681 nfs4_state_set_mode_locked(struct nfs4_state
*state
, fmode_t fmode
)
683 if (state
->state
== fmode
)
685 /* NB! List reordering - see the reclaim code for why. */
686 if ((fmode
& FMODE_WRITE
) != (state
->state
& FMODE_WRITE
)) {
687 if (fmode
& FMODE_WRITE
)
688 list_move(&state
->open_states
, &state
->owner
->so_states
);
690 list_move_tail(&state
->open_states
, &state
->owner
->so_states
);
692 state
->state
= fmode
;
695 static struct nfs4_state
*
696 __nfs4_find_state_byowner(struct inode
*inode
, struct nfs4_state_owner
*owner
)
698 struct nfs_inode
*nfsi
= NFS_I(inode
);
699 struct nfs4_state
*state
;
701 list_for_each_entry_rcu(state
, &nfsi
->open_states
, inode_states
) {
702 if (state
->owner
!= owner
)
704 if (!nfs4_valid_open_stateid(state
))
706 if (refcount_inc_not_zero(&state
->count
))
713 nfs4_free_open_state(struct nfs4_state
*state
)
715 kfree_rcu(state
, rcu_head
);
719 nfs4_get_open_state(struct inode
*inode
, struct nfs4_state_owner
*owner
)
721 struct nfs4_state
*state
, *new;
722 struct nfs_inode
*nfsi
= NFS_I(inode
);
725 state
= __nfs4_find_state_byowner(inode
, owner
);
729 new = nfs4_alloc_open_state();
730 spin_lock(&owner
->so_lock
);
731 spin_lock(&inode
->i_lock
);
732 state
= __nfs4_find_state_byowner(inode
, owner
);
733 if (state
== NULL
&& new != NULL
) {
735 state
->owner
= owner
;
736 atomic_inc(&owner
->so_count
);
738 state
->inode
= inode
;
739 list_add_rcu(&state
->inode_states
, &nfsi
->open_states
);
740 spin_unlock(&inode
->i_lock
);
741 /* Note: The reclaim code dictates that we add stateless
742 * and read-only stateids to the end of the list */
743 list_add_tail(&state
->open_states
, &owner
->so_states
);
744 spin_unlock(&owner
->so_lock
);
746 spin_unlock(&inode
->i_lock
);
747 spin_unlock(&owner
->so_lock
);
749 nfs4_free_open_state(new);
755 void nfs4_put_open_state(struct nfs4_state
*state
)
757 struct inode
*inode
= state
->inode
;
758 struct nfs4_state_owner
*owner
= state
->owner
;
760 if (!refcount_dec_and_lock(&state
->count
, &owner
->so_lock
))
762 spin_lock(&inode
->i_lock
);
763 list_del_rcu(&state
->inode_states
);
764 list_del(&state
->open_states
);
765 spin_unlock(&inode
->i_lock
);
766 spin_unlock(&owner
->so_lock
);
767 nfs4_inode_return_delegation_on_close(inode
);
769 nfs4_free_open_state(state
);
770 nfs4_put_state_owner(owner
);
774 * Close the current file.
776 static void __nfs4_close(struct nfs4_state
*state
,
777 fmode_t fmode
, gfp_t gfp_mask
, int wait
)
779 struct nfs4_state_owner
*owner
= state
->owner
;
783 atomic_inc(&owner
->so_count
);
784 /* Protect against nfs4_find_state() */
785 spin_lock(&owner
->so_lock
);
786 switch (fmode
& (FMODE_READ
| FMODE_WRITE
)) {
793 case FMODE_READ
|FMODE_WRITE
:
796 newstate
= FMODE_READ
|FMODE_WRITE
;
797 if (state
->n_rdwr
== 0) {
798 if (state
->n_rdonly
== 0) {
799 newstate
&= ~FMODE_READ
;
800 call_close
|= test_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
801 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
803 if (state
->n_wronly
== 0) {
804 newstate
&= ~FMODE_WRITE
;
805 call_close
|= test_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
806 call_close
|= test_bit(NFS_O_RDWR_STATE
, &state
->flags
);
809 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
811 nfs4_state_set_mode_locked(state
, newstate
);
812 spin_unlock(&owner
->so_lock
);
815 nfs4_put_open_state(state
);
816 nfs4_put_state_owner(owner
);
818 nfs4_do_close(state
, gfp_mask
, wait
);
821 void nfs4_close_state(struct nfs4_state
*state
, fmode_t fmode
)
823 __nfs4_close(state
, fmode
, GFP_NOFS
, 0);
826 void nfs4_close_sync(struct nfs4_state
*state
, fmode_t fmode
)
828 __nfs4_close(state
, fmode
, GFP_KERNEL
, 1);
832 * Search the state->lock_states for an existing lock_owner
833 * that is compatible with either of the given owners.
834 * If the second is non-zero, then the first refers to a Posix-lock
835 * owner (current->files) and the second refers to a flock/OFD
836 * owner (struct file*). In that case, prefer a match for the first
838 * If both sorts of locks are held on the one file we cannot know
839 * which stateid was intended to be used, so a "correct" choice cannot
840 * be made. Failing that, a "consistent" choice is preferable. The
841 * consistent choice we make is to prefer the first owner, that of a
844 static struct nfs4_lock_state
*
845 __nfs4_find_lock_state(struct nfs4_state
*state
,
846 fl_owner_t fl_owner
, fl_owner_t fl_owner2
)
848 struct nfs4_lock_state
*pos
, *ret
= NULL
;
849 list_for_each_entry(pos
, &state
->lock_states
, ls_locks
) {
850 if (pos
->ls_owner
== fl_owner
) {
854 if (pos
->ls_owner
== fl_owner2
)
858 refcount_inc(&ret
->ls_count
);
863 * Return a compatible lock_state. If no initialized lock_state structure
864 * exists, return an uninitialized one.
867 static struct nfs4_lock_state
*nfs4_alloc_lock_state(struct nfs4_state
*state
, fl_owner_t fl_owner
)
869 struct nfs4_lock_state
*lsp
;
870 struct nfs_server
*server
= state
->owner
->so_server
;
872 lsp
= kzalloc(sizeof(*lsp
), GFP_NOFS
);
875 nfs4_init_seqid_counter(&lsp
->ls_seqid
);
876 refcount_set(&lsp
->ls_count
, 1);
877 lsp
->ls_state
= state
;
878 lsp
->ls_owner
= fl_owner
;
879 lsp
->ls_seqid
.owner_id
= ida_simple_get(&server
->lockowner_id
, 0, 0, GFP_NOFS
);
880 if (lsp
->ls_seqid
.owner_id
< 0)
882 INIT_LIST_HEAD(&lsp
->ls_locks
);
889 void nfs4_free_lock_state(struct nfs_server
*server
, struct nfs4_lock_state
*lsp
)
891 ida_simple_remove(&server
->lockowner_id
, lsp
->ls_seqid
.owner_id
);
892 nfs4_destroy_seqid_counter(&lsp
->ls_seqid
);
897 * Return a compatible lock_state. If no initialized lock_state structure
898 * exists, return an uninitialized one.
901 static struct nfs4_lock_state
*nfs4_get_lock_state(struct nfs4_state
*state
, fl_owner_t owner
)
903 struct nfs4_lock_state
*lsp
, *new = NULL
;
906 spin_lock(&state
->state_lock
);
907 lsp
= __nfs4_find_lock_state(state
, owner
, NULL
);
911 list_add(&new->ls_locks
, &state
->lock_states
);
912 set_bit(LK_STATE_IN_USE
, &state
->flags
);
917 spin_unlock(&state
->state_lock
);
918 new = nfs4_alloc_lock_state(state
, owner
);
922 spin_unlock(&state
->state_lock
);
924 nfs4_free_lock_state(state
->owner
->so_server
, new);
929 * Release reference to lock_state, and free it if we see that
930 * it is no longer in use
932 void nfs4_put_lock_state(struct nfs4_lock_state
*lsp
)
934 struct nfs_server
*server
;
935 struct nfs4_state
*state
;
939 state
= lsp
->ls_state
;
940 if (!refcount_dec_and_lock(&lsp
->ls_count
, &state
->state_lock
))
942 list_del(&lsp
->ls_locks
);
943 if (list_empty(&state
->lock_states
))
944 clear_bit(LK_STATE_IN_USE
, &state
->flags
);
945 spin_unlock(&state
->state_lock
);
946 server
= state
->owner
->so_server
;
947 if (test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
)) {
948 struct nfs_client
*clp
= server
->nfs_client
;
950 clp
->cl_mvops
->free_lock_state(server
, lsp
);
952 nfs4_free_lock_state(server
, lsp
);
955 static void nfs4_fl_copy_lock(struct file_lock
*dst
, struct file_lock
*src
)
957 struct nfs4_lock_state
*lsp
= src
->fl_u
.nfs4_fl
.owner
;
959 dst
->fl_u
.nfs4_fl
.owner
= lsp
;
960 refcount_inc(&lsp
->ls_count
);
963 static void nfs4_fl_release_lock(struct file_lock
*fl
)
965 nfs4_put_lock_state(fl
->fl_u
.nfs4_fl
.owner
);
968 static const struct file_lock_operations nfs4_fl_lock_ops
= {
969 .fl_copy_lock
= nfs4_fl_copy_lock
,
970 .fl_release_private
= nfs4_fl_release_lock
,
973 int nfs4_set_lock_state(struct nfs4_state
*state
, struct file_lock
*fl
)
975 struct nfs4_lock_state
*lsp
;
977 if (fl
->fl_ops
!= NULL
)
979 lsp
= nfs4_get_lock_state(state
, fl
->fl_owner
);
982 fl
->fl_u
.nfs4_fl
.owner
= lsp
;
983 fl
->fl_ops
= &nfs4_fl_lock_ops
;
987 static int nfs4_copy_lock_stateid(nfs4_stateid
*dst
,
988 struct nfs4_state
*state
,
989 const struct nfs_lock_context
*l_ctx
)
991 struct nfs4_lock_state
*lsp
;
992 fl_owner_t fl_owner
, fl_flock_owner
;
998 if (test_bit(LK_STATE_IN_USE
, &state
->flags
) == 0)
1001 fl_owner
= l_ctx
->lockowner
;
1002 fl_flock_owner
= l_ctx
->open_context
->flock_owner
;
1004 spin_lock(&state
->state_lock
);
1005 lsp
= __nfs4_find_lock_state(state
, fl_owner
, fl_flock_owner
);
1006 if (lsp
&& test_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
))
1008 else if (lsp
!= NULL
&& test_bit(NFS_LOCK_INITIALIZED
, &lsp
->ls_flags
) != 0) {
1009 nfs4_stateid_copy(dst
, &lsp
->ls_stateid
);
1012 spin_unlock(&state
->state_lock
);
1013 nfs4_put_lock_state(lsp
);
1018 bool nfs4_copy_open_stateid(nfs4_stateid
*dst
, struct nfs4_state
*state
)
1021 const nfs4_stateid
*src
;
1026 src
= &zero_stateid
;
1027 seq
= read_seqbegin(&state
->seqlock
);
1028 if (test_bit(NFS_OPEN_STATE
, &state
->flags
)) {
1029 src
= &state
->open_stateid
;
1032 nfs4_stateid_copy(dst
, src
);
1033 } while (read_seqretry(&state
->seqlock
, seq
));
1038 * Byte-range lock aware utility to initialize the stateid of read/write
1041 int nfs4_select_rw_stateid(struct nfs4_state
*state
,
1042 fmode_t fmode
, const struct nfs_lock_context
*l_ctx
,
1043 nfs4_stateid
*dst
, const struct cred
**cred
)
1047 if (!nfs4_valid_open_stateid(state
))
1051 ret
= nfs4_copy_lock_stateid(dst
, state
, l_ctx
);
1053 /* A lost lock - don't even consider delegations */
1055 /* returns true if delegation stateid found and copied */
1056 if (nfs4_copy_delegation_stateid(state
->inode
, fmode
, dst
, cred
)) {
1061 /* nfs4_copy_delegation_stateid() didn't over-write
1062 * dst, so it still has the lock stateid which we now
1066 ret
= nfs4_copy_open_stateid(dst
, state
) ? 0 : -EAGAIN
;
1068 if (nfs_server_capable(state
->inode
, NFS_CAP_STATEID_NFSV41
))
1073 struct nfs_seqid
*nfs_alloc_seqid(struct nfs_seqid_counter
*counter
, gfp_t gfp_mask
)
1075 struct nfs_seqid
*new;
1077 new = kmalloc(sizeof(*new), gfp_mask
);
1079 return ERR_PTR(-ENOMEM
);
1080 new->sequence
= counter
;
1081 INIT_LIST_HEAD(&new->list
);
1086 void nfs_release_seqid(struct nfs_seqid
*seqid
)
1088 struct nfs_seqid_counter
*sequence
;
1090 if (seqid
== NULL
|| list_empty(&seqid
->list
))
1092 sequence
= seqid
->sequence
;
1093 spin_lock(&sequence
->lock
);
1094 list_del_init(&seqid
->list
);
1095 if (!list_empty(&sequence
->list
)) {
1096 struct nfs_seqid
*next
;
1098 next
= list_first_entry(&sequence
->list
,
1099 struct nfs_seqid
, list
);
1100 rpc_wake_up_queued_task(&sequence
->wait
, next
->task
);
1102 spin_unlock(&sequence
->lock
);
1105 void nfs_free_seqid(struct nfs_seqid
*seqid
)
1107 nfs_release_seqid(seqid
);
1112 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1113 * failed with a seqid incrementing error -
1114 * see comments nfs4.h:seqid_mutating_error()
1116 static void nfs_increment_seqid(int status
, struct nfs_seqid
*seqid
)
1121 case -NFS4ERR_BAD_SEQID
:
1122 if (seqid
->sequence
->flags
& NFS_SEQID_CONFIRMED
)
1124 pr_warn_ratelimited("NFS: v4 server returned a bad"
1125 " sequence-id error on an"
1126 " 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_or_older(&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_or_older(&state
->stateid
, stateid
) &&
1446 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1450 if (test_bit(NFS_OPEN_STATE
, &state
->flags
) &&
1451 nfs4_stateid_match_or_older(&state
->open_stateid
, stateid
) &&
1452 nfs4_state_mark_reclaim_nograce(clp
, state
)) {
1456 if (nfs_state_lock_state_matches_stateid(state
, stateid
) &&
1457 nfs4_state_mark_reclaim_nograce(clp
, state
))
1462 nfs_inode_find_delegation_state_and_recover(inode
, stateid
);
1464 nfs4_schedule_state_manager(clp
);
1467 static void nfs4_state_mark_open_context_bad(struct nfs4_state
*state
, int err
)
1469 struct inode
*inode
= state
->inode
;
1470 struct nfs_inode
*nfsi
= NFS_I(inode
);
1471 struct nfs_open_context
*ctx
;
1474 list_for_each_entry_rcu(ctx
, &nfsi
->open_files
, list
) {
1475 if (ctx
->state
!= state
)
1477 set_bit(NFS_CONTEXT_BAD
, &ctx
->flags
);
1478 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1479 "error = %d\n", ctx
->dentry
, err
);
1484 static void nfs4_state_mark_recovery_failed(struct nfs4_state
*state
, int error
)
1486 set_bit(NFS_STATE_RECOVERY_FAILED
, &state
->flags
);
1487 nfs4_state_mark_open_context_bad(state
, error
);
1491 static int nfs4_reclaim_locks(struct nfs4_state
*state
, const struct nfs4_state_recovery_ops
*ops
)
1493 struct inode
*inode
= state
->inode
;
1494 struct nfs_inode
*nfsi
= NFS_I(inode
);
1495 struct file_lock
*fl
;
1496 struct nfs4_lock_state
*lsp
;
1498 struct file_lock_context
*flctx
= inode
->i_flctx
;
1499 struct list_head
*list
;
1504 list
= &flctx
->flc_posix
;
1506 /* Guard against delegation returns and new lock/unlock calls */
1507 down_write(&nfsi
->rwsem
);
1508 spin_lock(&flctx
->flc_lock
);
1510 list_for_each_entry(fl
, list
, fl_list
) {
1511 if (nfs_file_open_context(fl
->fl_file
)->state
!= state
)
1513 spin_unlock(&flctx
->flc_lock
);
1514 status
= ops
->recover_lock(state
, fl
);
1520 case -NFS4ERR_ADMIN_REVOKED
:
1521 case -NFS4ERR_STALE_STATEID
:
1522 case -NFS4ERR_BAD_STATEID
:
1523 case -NFS4ERR_EXPIRED
:
1524 case -NFS4ERR_NO_GRACE
:
1525 case -NFS4ERR_STALE_CLIENTID
:
1526 case -NFS4ERR_BADSESSION
:
1527 case -NFS4ERR_BADSLOT
:
1528 case -NFS4ERR_BAD_HIGH_SLOT
:
1529 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1532 pr_err("NFS: %s: unhandled error %d\n",
1536 case -NFS4ERR_DENIED
:
1537 case -NFS4ERR_RECLAIM_BAD
:
1538 case -NFS4ERR_RECLAIM_CONFLICT
:
1539 lsp
= fl
->fl_u
.nfs4_fl
.owner
;
1541 set_bit(NFS_LOCK_LOST
, &lsp
->ls_flags
);
1544 spin_lock(&flctx
->flc_lock
);
1546 if (list
== &flctx
->flc_posix
) {
1547 list
= &flctx
->flc_flock
;
1550 spin_unlock(&flctx
->flc_lock
);
1552 up_write(&nfsi
->rwsem
);
1556 #ifdef CONFIG_NFS_V4_2
1557 static void nfs42_complete_copies(struct nfs4_state_owner
*sp
, struct nfs4_state
*state
)
1559 struct nfs4_copy_state
*copy
;
1561 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE
, &state
->flags
) &&
1562 !test_bit(NFS_CLNT_SRC_SSC_COPY_STATE
, &state
->flags
))
1565 spin_lock(&sp
->so_server
->nfs_client
->cl_lock
);
1566 list_for_each_entry(copy
, &sp
->so_server
->ss_copies
, copies
) {
1567 if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE
, &state
->flags
) &&
1568 !nfs4_stateid_match_other(&state
->stateid
,
1569 ©
->parent_dst_state
->stateid
)))
1572 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE
,
1574 clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE
, &state
->flags
);
1575 complete(©
->completion
);
1578 list_for_each_entry(copy
, &sp
->so_server
->ss_copies
, src_copies
) {
1579 if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE
, &state
->flags
) &&
1580 !nfs4_stateid_match_other(&state
->stateid
,
1581 ©
->parent_src_state
->stateid
)))
1584 if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE
,
1586 complete(©
->completion
);
1588 spin_unlock(&sp
->so_server
->nfs_client
->cl_lock
);
1590 #else /* !CONFIG_NFS_V4_2 */
1591 static inline void nfs42_complete_copies(struct nfs4_state_owner
*sp
,
1592 struct nfs4_state
*state
)
1595 #endif /* CONFIG_NFS_V4_2 */
1597 static int __nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, struct nfs4_state
*state
,
1598 const struct nfs4_state_recovery_ops
*ops
)
1600 struct nfs4_lock_state
*lock
;
1603 status
= ops
->recover_open(sp
, state
);
1607 status
= nfs4_reclaim_locks(state
, ops
);
1611 if (!test_bit(NFS_DELEGATED_STATE
, &state
->flags
)) {
1612 spin_lock(&state
->state_lock
);
1613 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1614 trace_nfs4_state_lock_reclaim(state
, lock
);
1615 if (!test_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
))
1616 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__
);
1618 spin_unlock(&state
->state_lock
);
1621 nfs42_complete_copies(sp
, state
);
1622 clear_bit(NFS_STATE_RECLAIM_NOGRACE
, &state
->flags
);
1626 static int nfs4_reclaim_open_state(struct nfs4_state_owner
*sp
, const struct nfs4_state_recovery_ops
*ops
)
1628 struct nfs4_state
*state
;
1629 unsigned int loop
= 0;
1631 #ifdef CONFIG_NFS_V4_2
1632 bool found_ssc_copy_state
= false;
1633 #endif /* CONFIG_NFS_V4_2 */
1635 /* Note: we rely on the sp->so_states list being ordered
1636 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1638 * This is needed to ensure that the server won't give us any
1639 * read delegations that we have to return if, say, we are
1640 * recovering after a network partition or a reboot from a
1641 * server that doesn't support a grace period.
1643 spin_lock(&sp
->so_lock
);
1644 raw_write_seqcount_begin(&sp
->so_reclaim_seqcount
);
1646 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1647 if (!test_and_clear_bit(ops
->state_flag_bit
, &state
->flags
))
1649 if (!nfs4_valid_open_stateid(state
))
1651 if (state
->state
== 0)
1653 #ifdef CONFIG_NFS_V4_2
1654 if (test_bit(NFS_SRV_SSC_COPY_STATE
, &state
->flags
)) {
1655 nfs4_state_mark_recovery_failed(state
, -EIO
);
1656 found_ssc_copy_state
= true;
1659 #endif /* CONFIG_NFS_V4_2 */
1660 refcount_inc(&state
->count
);
1661 spin_unlock(&sp
->so_lock
);
1662 status
= __nfs4_reclaim_open_state(sp
, state
, ops
);
1670 printk(KERN_ERR
"NFS: %s: unhandled error %d\n", __func__
, status
);
1678 /* Open state on this file cannot be recovered */
1679 nfs4_state_mark_recovery_failed(state
, status
);
1684 set_bit(ops
->state_flag_bit
, &state
->flags
);
1688 case -NFS4ERR_ADMIN_REVOKED
:
1689 case -NFS4ERR_STALE_STATEID
:
1690 case -NFS4ERR_OLD_STATEID
:
1691 case -NFS4ERR_BAD_STATEID
:
1692 case -NFS4ERR_RECLAIM_BAD
:
1693 case -NFS4ERR_RECLAIM_CONFLICT
:
1694 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1696 case -NFS4ERR_EXPIRED
:
1697 case -NFS4ERR_NO_GRACE
:
1698 nfs4_state_mark_reclaim_nograce(sp
->so_server
->nfs_client
, state
);
1700 case -NFS4ERR_STALE_CLIENTID
:
1701 case -NFS4ERR_BADSESSION
:
1702 case -NFS4ERR_BADSLOT
:
1703 case -NFS4ERR_BAD_HIGH_SLOT
:
1704 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1708 nfs4_put_open_state(state
);
1709 spin_lock(&sp
->so_lock
);
1712 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1713 spin_unlock(&sp
->so_lock
);
1714 #ifdef CONFIG_NFS_V4_2
1715 if (found_ssc_copy_state
)
1717 #endif /* CONFIG_NFS_V4_2 */
1720 nfs4_put_open_state(state
);
1721 spin_lock(&sp
->so_lock
);
1722 raw_write_seqcount_end(&sp
->so_reclaim_seqcount
);
1723 spin_unlock(&sp
->so_lock
);
1727 static void nfs4_clear_open_state(struct nfs4_state
*state
)
1729 struct nfs4_lock_state
*lock
;
1731 clear_bit(NFS_DELEGATED_STATE
, &state
->flags
);
1732 clear_bit(NFS_O_RDONLY_STATE
, &state
->flags
);
1733 clear_bit(NFS_O_WRONLY_STATE
, &state
->flags
);
1734 clear_bit(NFS_O_RDWR_STATE
, &state
->flags
);
1735 spin_lock(&state
->state_lock
);
1736 list_for_each_entry(lock
, &state
->lock_states
, ls_locks
) {
1737 lock
->ls_seqid
.flags
= 0;
1738 clear_bit(NFS_LOCK_INITIALIZED
, &lock
->ls_flags
);
1740 spin_unlock(&state
->state_lock
);
1743 static void nfs4_reset_seqids(struct nfs_server
*server
,
1744 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1746 struct nfs_client
*clp
= server
->nfs_client
;
1747 struct nfs4_state_owner
*sp
;
1748 struct rb_node
*pos
;
1749 struct nfs4_state
*state
;
1751 spin_lock(&clp
->cl_lock
);
1752 for (pos
= rb_first(&server
->state_owners
);
1754 pos
= rb_next(pos
)) {
1755 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1756 sp
->so_seqid
.flags
= 0;
1757 spin_lock(&sp
->so_lock
);
1758 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1759 if (mark_reclaim(clp
, state
))
1760 nfs4_clear_open_state(state
);
1762 spin_unlock(&sp
->so_lock
);
1764 spin_unlock(&clp
->cl_lock
);
1767 static void nfs4_state_mark_reclaim_helper(struct nfs_client
*clp
,
1768 int (*mark_reclaim
)(struct nfs_client
*clp
, struct nfs4_state
*state
))
1770 struct nfs_server
*server
;
1773 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1774 nfs4_reset_seqids(server
, mark_reclaim
);
1778 static void nfs4_state_start_reclaim_reboot(struct nfs_client
*clp
)
1780 /* Mark all delegations for reclaim */
1781 nfs_delegation_mark_reclaim(clp
);
1782 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_reboot
);
1785 static int nfs4_reclaim_complete(struct nfs_client
*clp
,
1786 const struct nfs4_state_recovery_ops
*ops
,
1787 const struct cred
*cred
)
1789 /* Notify the server we're done reclaiming our state */
1790 if (ops
->reclaim_complete
)
1791 return ops
->reclaim_complete(clp
, cred
);
1795 static void nfs4_clear_reclaim_server(struct nfs_server
*server
)
1797 struct nfs_client
*clp
= server
->nfs_client
;
1798 struct nfs4_state_owner
*sp
;
1799 struct rb_node
*pos
;
1800 struct nfs4_state
*state
;
1802 spin_lock(&clp
->cl_lock
);
1803 for (pos
= rb_first(&server
->state_owners
);
1805 pos
= rb_next(pos
)) {
1806 sp
= rb_entry(pos
, struct nfs4_state_owner
, so_server_node
);
1807 spin_lock(&sp
->so_lock
);
1808 list_for_each_entry(state
, &sp
->so_states
, open_states
) {
1809 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT
,
1812 nfs4_state_mark_reclaim_nograce(clp
, state
);
1814 spin_unlock(&sp
->so_lock
);
1816 spin_unlock(&clp
->cl_lock
);
1819 static int nfs4_state_clear_reclaim_reboot(struct nfs_client
*clp
)
1821 struct nfs_server
*server
;
1823 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
))
1827 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
)
1828 nfs4_clear_reclaim_server(server
);
1831 nfs_delegation_reap_unclaimed(clp
);
1835 static void nfs4_state_end_reclaim_reboot(struct nfs_client
*clp
)
1837 const struct nfs4_state_recovery_ops
*ops
;
1838 const struct cred
*cred
;
1841 if (!nfs4_state_clear_reclaim_reboot(clp
))
1843 ops
= clp
->cl_mvops
->reboot_recovery_ops
;
1844 cred
= nfs4_get_clid_cred(clp
);
1845 err
= nfs4_reclaim_complete(clp
, ops
, cred
);
1847 if (err
== -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
)
1848 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
1851 static void nfs4_state_start_reclaim_nograce(struct nfs_client
*clp
)
1853 nfs_mark_test_expired_all_delegations(clp
);
1854 nfs4_state_mark_reclaim_helper(clp
, nfs4_state_mark_reclaim_nograce
);
1857 static int nfs4_recovery_handle_error(struct nfs_client
*clp
, int error
)
1862 case -NFS4ERR_CB_PATH_DOWN
:
1863 nfs40_handle_cb_pathdown(clp
);
1865 case -NFS4ERR_NO_GRACE
:
1866 nfs4_state_end_reclaim_reboot(clp
);
1868 case -NFS4ERR_STALE_CLIENTID
:
1869 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1870 nfs4_state_start_reclaim_reboot(clp
);
1872 case -NFS4ERR_EXPIRED
:
1873 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
1874 nfs4_state_start_reclaim_nograce(clp
);
1876 case -NFS4ERR_BADSESSION
:
1877 case -NFS4ERR_BADSLOT
:
1878 case -NFS4ERR_BAD_HIGH_SLOT
:
1879 case -NFS4ERR_DEADSESSION
:
1880 case -NFS4ERR_SEQ_FALSE_RETRY
:
1881 case -NFS4ERR_SEQ_MISORDERED
:
1882 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
1883 /* Zero session reset errors */
1885 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
1886 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
1889 dprintk("%s: failed to handle error %d for server %s\n",
1890 __func__
, error
, clp
->cl_hostname
);
1893 dprintk("%s: handled error %d for server %s\n", __func__
, error
,
1898 static int nfs4_do_reclaim(struct nfs_client
*clp
, const struct nfs4_state_recovery_ops
*ops
)
1900 struct nfs4_state_owner
*sp
;
1901 struct nfs_server
*server
;
1902 struct rb_node
*pos
;
1908 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
1909 nfs4_purge_state_owners(server
, &freeme
);
1910 spin_lock(&clp
->cl_lock
);
1911 for (pos
= rb_first(&server
->state_owners
);
1913 pos
= rb_next(pos
)) {
1915 struct nfs4_state_owner
, so_server_node
);
1916 if (!test_and_clear_bit(ops
->owner_flag_bit
,
1919 if (!atomic_inc_not_zero(&sp
->so_count
))
1921 spin_unlock(&clp
->cl_lock
);
1924 status
= nfs4_reclaim_open_state(sp
, ops
);
1926 set_bit(ops
->owner_flag_bit
, &sp
->so_flags
);
1927 nfs4_put_state_owner(sp
);
1928 status
= nfs4_recovery_handle_error(clp
, status
);
1929 return (status
!= 0) ? status
: -EAGAIN
;
1932 nfs4_put_state_owner(sp
);
1935 spin_unlock(&clp
->cl_lock
);
1938 nfs4_free_state_owners(&freeme
);
1942 static int nfs4_check_lease(struct nfs_client
*clp
)
1944 const struct cred
*cred
;
1945 const struct nfs4_state_maintenance_ops
*ops
=
1946 clp
->cl_mvops
->state_renewal_ops
;
1949 /* Is the client already known to have an expired lease? */
1950 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
1952 cred
= ops
->get_state_renewal_cred(clp
);
1954 cred
= nfs4_get_clid_cred(clp
);
1959 status
= ops
->renew_lease(clp
, cred
);
1961 if (status
== -ETIMEDOUT
) {
1962 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
1966 return nfs4_recovery_handle_error(clp
, status
);
1969 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1970 * and for recoverable errors on EXCHANGE_ID for v4.1
1972 static int nfs4_handle_reclaim_lease_error(struct nfs_client
*clp
, int status
)
1975 case -NFS4ERR_SEQ_MISORDERED
:
1976 if (test_and_set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
))
1977 return -ESERVERFAULT
;
1978 /* Lease confirmation error: retry after purging the lease */
1980 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1982 case -NFS4ERR_STALE_CLIENTID
:
1983 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1984 nfs4_state_start_reclaim_reboot(clp
);
1986 case -NFS4ERR_CLID_INUSE
:
1987 pr_err("NFS: Server %s reports our clientid is in use\n",
1989 nfs_mark_client_ready(clp
, -EPERM
);
1990 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
1993 case -NFS4ERR_DELAY
:
1998 case -NFS4ERR_MINOR_VERS_MISMATCH
:
1999 if (clp
->cl_cons_state
== NFS_CS_SESSION_INITING
)
2000 nfs_mark_client_ready(clp
, -EPROTONOSUPPORT
);
2001 dprintk("%s: exit with error %d for server %s\n",
2002 __func__
, -EPROTONOSUPPORT
, clp
->cl_hostname
);
2003 return -EPROTONOSUPPORT
;
2004 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
2005 * in nfs4_exchange_id */
2007 dprintk("%s: exit with error %d for server %s\n", __func__
,
2008 status
, clp
->cl_hostname
);
2011 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
2012 dprintk("%s: handled error %d for server %s\n", __func__
, status
,
2017 static int nfs4_establish_lease(struct nfs_client
*clp
)
2019 const struct cred
*cred
;
2020 const struct nfs4_state_recovery_ops
*ops
=
2021 clp
->cl_mvops
->reboot_recovery_ops
;
2024 status
= nfs4_begin_drain_session(clp
);
2027 cred
= nfs4_get_clid_cred(clp
);
2030 status
= ops
->establish_clid(clp
, cred
);
2034 pnfs_destroy_all_layouts(clp
);
2039 * Returns zero or a negative errno. NFS4ERR values are converted
2040 * to local errno values.
2042 static int nfs4_reclaim_lease(struct nfs_client
*clp
)
2046 status
= nfs4_establish_lease(clp
);
2048 return nfs4_handle_reclaim_lease_error(clp
, status
);
2049 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH
, &clp
->cl_state
))
2050 nfs4_state_start_reclaim_nograce(clp
);
2051 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
))
2052 set_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
);
2053 clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2054 clear_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
2058 static int nfs4_purge_lease(struct nfs_client
*clp
)
2062 status
= nfs4_establish_lease(clp
);
2064 return nfs4_handle_reclaim_lease_error(clp
, status
);
2065 clear_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2066 set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
);
2067 nfs4_state_start_reclaim_nograce(clp
);
2072 * Try remote migration of one FSID from a source server to a
2073 * destination server. The source server provides a list of
2074 * potential destinations.
2076 * Returns zero or a negative NFS4ERR status code.
2078 static int nfs4_try_migration(struct nfs_server
*server
, const struct cred
*cred
)
2080 struct nfs_client
*clp
= server
->nfs_client
;
2081 struct nfs4_fs_locations
*locations
= NULL
;
2082 struct inode
*inode
;
2086 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__
,
2087 (unsigned long long)server
->fsid
.major
,
2088 (unsigned long long)server
->fsid
.minor
,
2092 page
= alloc_page(GFP_KERNEL
);
2093 locations
= kmalloc(sizeof(struct nfs4_fs_locations
), GFP_KERNEL
);
2094 if (page
== NULL
|| locations
== NULL
) {
2095 dprintk("<-- %s: no memory\n", __func__
);
2099 inode
= d_inode(server
->super
->s_root
);
2100 result
= nfs4_proc_get_locations(inode
, locations
, page
, cred
);
2102 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2107 result
= -NFS4ERR_NXIO
;
2108 if (!(locations
->fattr
.valid
& NFS_ATTR_FATTR_V4_LOCATIONS
)) {
2109 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2114 status
= nfs4_begin_drain_session(clp
);
2120 status
= nfs4_replace_transport(server
, locations
);
2122 dprintk("<-- %s: failed to replace transport: %d\n",
2128 dprintk("<-- %s: migration succeeded\n", __func__
);
2135 pr_err("NFS: migration recovery failed (server %s)\n",
2137 set_bit(NFS_MIG_FAILED
, &server
->mig_status
);
2143 * Returns zero or a negative NFS4ERR status code.
2145 static int nfs4_handle_migration(struct nfs_client
*clp
)
2147 const struct nfs4_state_maintenance_ops
*ops
=
2148 clp
->cl_mvops
->state_renewal_ops
;
2149 struct nfs_server
*server
;
2150 const struct cred
*cred
;
2152 dprintk("%s: migration reported on \"%s\"\n", __func__
,
2155 cred
= ops
->get_state_renewal_cred(clp
);
2157 return -NFS4ERR_NOENT
;
2162 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2165 if (server
->mig_gen
== clp
->cl_mig_gen
)
2167 server
->mig_gen
= clp
->cl_mig_gen
;
2169 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION
,
2170 &server
->mig_status
))
2174 status
= nfs4_try_migration(server
, cred
);
2187 * Test each nfs_server on the clp's cl_superblocks list to see
2188 * if it's moved to another server. Stop when the server no longer
2189 * returns NFS4ERR_LEASE_MOVED.
2191 static int nfs4_handle_lease_moved(struct nfs_client
*clp
)
2193 const struct nfs4_state_maintenance_ops
*ops
=
2194 clp
->cl_mvops
->state_renewal_ops
;
2195 struct nfs_server
*server
;
2196 const struct cred
*cred
;
2198 dprintk("%s: lease moved reported on \"%s\"\n", __func__
,
2201 cred
= ops
->get_state_renewal_cred(clp
);
2203 return -NFS4ERR_NOENT
;
2208 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
2209 struct inode
*inode
;
2212 if (server
->mig_gen
== clp
->cl_mig_gen
)
2214 server
->mig_gen
= clp
->cl_mig_gen
;
2218 inode
= d_inode(server
->super
->s_root
);
2219 status
= nfs4_proc_fsid_present(inode
, cred
);
2220 if (status
!= -NFS4ERR_MOVED
)
2221 goto restart
; /* wasn't this one */
2222 if (nfs4_try_migration(server
, cred
) == -NFS4ERR_LEASE_MOVED
)
2223 goto restart
; /* there are more */
2234 * nfs4_discover_server_trunking - Detect server IP address trunking
2236 * @clp: nfs_client under test
2237 * @result: OUT: found nfs_client, or clp
2239 * Returns zero or a negative errno. If zero is returned,
2240 * an nfs_client pointer is planted in "result".
2242 * Note: since we are invoked in process context, and
2243 * not from inside the state manager, we cannot use
2244 * nfs4_handle_reclaim_lease_error().
2246 int nfs4_discover_server_trunking(struct nfs_client
*clp
,
2247 struct nfs_client
**result
)
2249 const struct nfs4_state_recovery_ops
*ops
=
2250 clp
->cl_mvops
->reboot_recovery_ops
;
2251 struct rpc_clnt
*clnt
;
2252 const struct cred
*cred
;
2255 dprintk("NFS: %s: testing '%s'\n", __func__
, clp
->cl_hostname
);
2257 clnt
= clp
->cl_rpcclient
;
2260 mutex_lock(&nfs_clid_init_mutex
);
2263 cred
= nfs4_get_clid_cred(clp
);
2267 status
= ops
->detect_trunking(clp
, result
, cred
);
2275 if (clnt
->cl_softrtry
)
2278 case -NFS4ERR_DELAY
:
2282 case -NFS4ERR_STALE_CLIENTID
:
2283 dprintk("NFS: %s after status %d, retrying\n",
2288 nfs4_root_machine_cred(clp
);
2291 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
)
2294 case -NFS4ERR_CLID_INUSE
:
2295 case -NFS4ERR_WRONGSEC
:
2296 /* No point in retrying if we already used RPC_AUTH_UNIX */
2297 if (clnt
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
) {
2301 clnt
= rpc_clone_client_set_auth(clnt
, RPC_AUTH_UNIX
);
2303 status
= PTR_ERR(clnt
);
2306 /* Note: this is safe because we haven't yet marked the
2307 * client as ready, so we are the only user of
2310 clnt
= xchg(&clp
->cl_rpcclient
, clnt
);
2311 rpc_shutdown_client(clnt
);
2312 clnt
= clp
->cl_rpcclient
;
2315 case -NFS4ERR_MINOR_VERS_MISMATCH
:
2316 status
= -EPROTONOSUPPORT
;
2320 case -NFS4ERR_NOT_SAME
: /* FixMe: implement recovery
2321 * in nfs4_exchange_id */
2322 status
= -EKEYEXPIRED
;
2325 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2331 mutex_unlock(&nfs_clid_init_mutex
);
2332 dprintk("NFS: %s: status = %d\n", __func__
, status
);
2336 #ifdef CONFIG_NFS_V4_1
2337 void nfs4_schedule_session_recovery(struct nfs4_session
*session
, int err
)
2339 struct nfs_client
*clp
= session
->clp
;
2343 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2345 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION
:
2346 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2348 nfs4_schedule_state_manager(clp
);
2350 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery
);
2352 void nfs41_notify_server(struct nfs_client
*clp
)
2354 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2355 set_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
);
2356 nfs4_schedule_state_manager(clp
);
2359 static void nfs4_reset_all_state(struct nfs_client
*clp
)
2361 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2362 set_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
);
2363 clear_bit(NFS4CLNT_LEASE_CONFIRM
, &clp
->cl_state
);
2364 nfs4_state_start_reclaim_nograce(clp
);
2365 dprintk("%s: scheduling reset of all state for server %s!\n",
2366 __func__
, clp
->cl_hostname
);
2367 nfs4_schedule_state_manager(clp
);
2371 static void nfs41_handle_server_reboot(struct nfs_client
*clp
)
2373 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
) == 0) {
2374 nfs4_state_start_reclaim_reboot(clp
);
2375 dprintk("%s: server %s rebooted!\n", __func__
,
2377 nfs4_schedule_state_manager(clp
);
2381 static void nfs41_handle_all_state_revoked(struct nfs_client
*clp
)
2383 nfs4_reset_all_state(clp
);
2384 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2387 static void nfs41_handle_some_state_revoked(struct nfs_client
*clp
)
2389 nfs4_state_start_reclaim_nograce(clp
);
2390 nfs4_schedule_state_manager(clp
);
2392 dprintk("%s: state revoked on server %s\n", __func__
, clp
->cl_hostname
);
2395 static void nfs41_handle_recallable_state_revoked(struct nfs_client
*clp
)
2397 /* FIXME: For now, we destroy all layouts. */
2398 pnfs_destroy_all_layouts(clp
);
2399 nfs_test_expired_all_delegations(clp
);
2400 dprintk("%s: Recallable state revoked on server %s!\n", __func__
,
2404 static void nfs41_handle_backchannel_fault(struct nfs_client
*clp
)
2406 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2407 nfs4_schedule_state_manager(clp
);
2409 dprintk("%s: server %s declared a backchannel fault\n", __func__
,
2413 static void nfs41_handle_cb_path_down(struct nfs_client
*clp
)
2415 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2416 &clp
->cl_state
) == 0)
2417 nfs4_schedule_state_manager(clp
);
2420 void nfs41_handle_sequence_flag_errors(struct nfs_client
*clp
, u32 flags
,
2426 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2427 __func__
, clp
->cl_hostname
, clp
->cl_clientid
, flags
);
2429 * If we're called from the state manager thread, then assume we're
2430 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2431 * Those flags are expected to remain set until we're done
2432 * recovering (see RFC5661, section 18.46.3).
2437 if (flags
& SEQ4_STATUS_RESTART_RECLAIM_NEEDED
)
2438 nfs41_handle_server_reboot(clp
);
2439 if (flags
& (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED
))
2440 nfs41_handle_all_state_revoked(clp
);
2441 if (flags
& (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED
|
2442 SEQ4_STATUS_ADMIN_STATE_REVOKED
))
2443 nfs41_handle_some_state_revoked(clp
);
2444 if (flags
& SEQ4_STATUS_LEASE_MOVED
)
2445 nfs4_schedule_lease_moved_recovery(clp
);
2446 if (flags
& SEQ4_STATUS_RECALLABLE_STATE_REVOKED
)
2447 nfs41_handle_recallable_state_revoked(clp
);
2449 if (flags
& SEQ4_STATUS_BACKCHANNEL_FAULT
)
2450 nfs41_handle_backchannel_fault(clp
);
2451 else if (flags
& (SEQ4_STATUS_CB_PATH_DOWN
|
2452 SEQ4_STATUS_CB_PATH_DOWN_SESSION
))
2453 nfs41_handle_cb_path_down(clp
);
2456 static int nfs4_reset_session(struct nfs_client
*clp
)
2458 const struct cred
*cred
;
2461 if (!nfs4_has_session(clp
))
2463 status
= nfs4_begin_drain_session(clp
);
2466 cred
= nfs4_get_clid_cred(clp
);
2467 status
= nfs4_proc_destroy_session(clp
->cl_session
, cred
);
2470 case -NFS4ERR_BADSESSION
:
2471 case -NFS4ERR_DEADSESSION
:
2473 case -NFS4ERR_BACK_CHAN_BUSY
:
2474 case -NFS4ERR_DELAY
:
2475 set_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
);
2480 status
= nfs4_recovery_handle_error(clp
, status
);
2484 memset(clp
->cl_session
->sess_id
.data
, 0, NFS4_MAX_SESSIONID_LEN
);
2485 status
= nfs4_proc_create_session(clp
, cred
);
2487 dprintk("%s: session reset failed with status %d for server %s!\n",
2488 __func__
, status
, clp
->cl_hostname
);
2489 status
= nfs4_handle_reclaim_lease_error(clp
, status
);
2492 nfs41_finish_session_reset(clp
);
2493 dprintk("%s: session reset was successful for server %s!\n",
2494 __func__
, clp
->cl_hostname
);
2500 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2502 const struct cred
*cred
;
2505 if (!nfs4_has_session(clp
))
2507 ret
= nfs4_begin_drain_session(clp
);
2510 cred
= nfs4_get_clid_cred(clp
);
2511 ret
= nfs4_proc_bind_conn_to_session(clp
, cred
);
2513 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2516 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2517 __func__
, clp
->cl_hostname
);
2519 case -NFS4ERR_DELAY
:
2521 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION
, &clp
->cl_state
);
2524 return nfs4_recovery_handle_error(clp
, ret
);
2529 static void nfs4_layoutreturn_any_run(struct nfs_client
*clp
)
2533 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ
, &clp
->cl_state
))
2534 iomode
+= IOMODE_READ
;
2535 if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW
, &clp
->cl_state
))
2536 iomode
+= IOMODE_RW
;
2537 /* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */
2539 pnfs_layout_return_unused_byclid(clp
, iomode
);
2540 set_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
2543 #else /* CONFIG_NFS_V4_1 */
2544 static int nfs4_reset_session(struct nfs_client
*clp
) { return 0; }
2546 static int nfs4_bind_conn_to_session(struct nfs_client
*clp
)
2551 static void nfs4_layoutreturn_any_run(struct nfs_client
*clp
)
2554 #endif /* CONFIG_NFS_V4_1 */
2556 static void nfs4_state_manager(struct nfs_client
*clp
)
2559 const char *section
= "", *section_sep
= "";
2561 /* Ensure exclusive access to NFSv4 state */
2563 trace_nfs4_state_mgr(clp
);
2564 clear_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
2565 if (test_bit(NFS4CLNT_PURGE_STATE
, &clp
->cl_state
)) {
2566 section
= "purge state";
2567 status
= nfs4_purge_lease(clp
);
2573 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
)) {
2574 section
= "lease expired";
2575 /* We're going to have to re-establish a clientid */
2576 status
= nfs4_reclaim_lease(clp
);
2582 /* Initialize or reset the session */
2583 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET
, &clp
->cl_state
)) {
2584 section
= "reset session";
2585 status
= nfs4_reset_session(clp
);
2586 if (test_bit(NFS4CLNT_LEASE_EXPIRED
, &clp
->cl_state
))
2592 /* Send BIND_CONN_TO_SESSION */
2593 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION
,
2595 section
= "bind conn to session";
2596 status
= nfs4_bind_conn_to_session(clp
);
2602 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE
, &clp
->cl_state
)) {
2603 section
= "check lease";
2604 status
= nfs4_check_lease(clp
);
2610 if (test_and_clear_bit(NFS4CLNT_MOVED
, &clp
->cl_state
)) {
2611 section
= "migration";
2612 status
= nfs4_handle_migration(clp
);
2617 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED
, &clp
->cl_state
)) {
2618 section
= "lease moved";
2619 status
= nfs4_handle_lease_moved(clp
);
2624 /* First recover reboot state... */
2625 if (test_bit(NFS4CLNT_RECLAIM_REBOOT
, &clp
->cl_state
)) {
2626 section
= "reclaim reboot";
2627 status
= nfs4_do_reclaim(clp
,
2628 clp
->cl_mvops
->reboot_recovery_ops
);
2629 if (status
== -EAGAIN
)
2633 nfs4_state_end_reclaim_reboot(clp
);
2636 /* Detect expired delegations... */
2637 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED
, &clp
->cl_state
)) {
2638 section
= "detect expired delegations";
2639 nfs_reap_expired_delegations(clp
);
2643 /* Now recover expired state... */
2644 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
)) {
2645 section
= "reclaim nograce";
2646 status
= nfs4_do_reclaim(clp
,
2647 clp
->cl_mvops
->nograce_recovery_ops
);
2648 if (status
== -EAGAIN
)
2652 clear_bit(NFS4CLNT_RECLAIM_NOGRACE
, &clp
->cl_state
);
2655 nfs4_end_drain_session(clp
);
2656 nfs4_clear_state_manager_bit(clp
);
2658 if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING
, &clp
->cl_state
)) {
2659 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN
, &clp
->cl_state
)) {
2660 nfs_client_return_marked_delegations(clp
);
2661 set_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
);
2663 nfs4_layoutreturn_any_run(clp
);
2664 clear_bit(NFS4CLNT_RECALL_RUNNING
, &clp
->cl_state
);
2667 /* Did we race with an attempt to give us more work? */
2668 if (!test_bit(NFS4CLNT_RUN_MANAGER
, &clp
->cl_state
))
2670 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING
, &clp
->cl_state
) != 0)
2672 } while (refcount_read(&clp
->cl_count
) > 1 && !signalled());
2676 if (strlen(section
))
2678 trace_nfs4_state_mgr_failed(clp
, section
, status
);
2679 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2680 " with error %d\n", section_sep
, section
,
2681 clp
->cl_hostname
, -status
);
2684 nfs4_end_drain_session(clp
);
2685 nfs4_clear_state_manager_bit(clp
);
2688 static int nfs4_run_state_manager(void *ptr
)
2690 struct nfs_client
*clp
= ptr
;
2692 allow_signal(SIGKILL
);
2693 nfs4_state_manager(clp
);
2694 nfs_put_client(clp
);
2695 module_put_and_exit(0);