4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid = {
70 .type = NFS4_SPECIAL_STATEID_TYPE,
72 static DEFINE_MUTEX(nfs_clid_init_mutex);
74 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
76 struct nfs4_setclientid_res clid = {
77 .clientid = clp->cl_clientid,
78 .confirm = clp->cl_confirm,
82 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
84 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
86 port = nn->nfs_callback_tcpport;
87 if (clp->cl_addr.ss_family == AF_INET6)
88 port = nn->nfs_callback_tcpport6;
90 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
93 clp->cl_clientid = clid.clientid;
94 clp->cl_confirm = clid.confirm;
95 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
97 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
100 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
101 nfs4_schedule_state_renewal(clp);
107 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
109 * @clp: nfs_client under test
110 * @result: OUT: found nfs_client, or clp
111 * @cred: credential to use for trunking test
113 * Returns zero, a negative errno, or a negative NFS4ERR status.
114 * If zero is returned, an nfs_client pointer is planted in
117 * Note: The returned client may not yet be marked ready.
119 int nfs40_discover_server_trunking(struct nfs_client *clp,
120 struct nfs_client **result,
121 struct rpc_cred *cred)
123 struct nfs4_setclientid_res clid = {
124 .clientid = clp->cl_clientid,
125 .confirm = clp->cl_confirm,
127 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
131 port = nn->nfs_callback_tcpport;
132 if (clp->cl_addr.ss_family == AF_INET6)
133 port = nn->nfs_callback_tcpport6;
135 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
138 clp->cl_clientid = clid.clientid;
139 clp->cl_confirm = clid.confirm;
141 status = nfs40_walk_client_list(clp, result, cred);
143 /* Sustain the lease, even if it's empty. If the clientid4
144 * goes stale it's of no use for trunking discovery. */
145 nfs4_schedule_state_renewal(*result);
151 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
153 struct rpc_cred *cred = NULL;
155 if (clp->cl_machine_cred != NULL)
156 cred = get_rpccred(clp->cl_machine_cred);
160 static void nfs4_root_machine_cred(struct nfs_client *clp)
162 struct rpc_cred *cred, *new;
164 new = rpc_lookup_machine_cred(NULL);
165 spin_lock(&clp->cl_lock);
166 cred = clp->cl_machine_cred;
167 clp->cl_machine_cred = new;
168 spin_unlock(&clp->cl_lock);
173 static struct rpc_cred *
174 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
176 struct rpc_cred *cred = NULL;
177 struct nfs4_state_owner *sp;
180 for (pos = rb_first(&server->state_owners);
182 pos = rb_next(pos)) {
183 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
184 if (list_empty(&sp->so_states))
186 cred = get_rpccred(sp->so_cred);
193 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
194 * @clp: client state handle
196 * Returns an rpc_cred with reference count bumped, or NULL.
197 * Caller must hold clp->cl_lock.
199 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
201 struct rpc_cred *cred = NULL;
202 struct nfs_server *server;
204 /* Use machine credentials if available */
205 cred = nfs4_get_machine_cred_locked(clp);
210 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
211 cred = nfs4_get_renew_cred_server_locked(server);
221 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
223 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
224 spin_lock(&tbl->slot_tbl_lock);
225 nfs41_wake_slot_table(tbl);
226 spin_unlock(&tbl->slot_tbl_lock);
230 static void nfs4_end_drain_session(struct nfs_client *clp)
232 struct nfs4_session *ses = clp->cl_session;
234 if (clp->cl_slot_tbl) {
235 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
240 nfs4_end_drain_slot_table(&ses->bc_slot_table);
241 nfs4_end_drain_slot_table(&ses->fc_slot_table);
245 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
247 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
248 spin_lock(&tbl->slot_tbl_lock);
249 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
250 reinit_completion(&tbl->complete);
251 spin_unlock(&tbl->slot_tbl_lock);
252 return wait_for_completion_interruptible(&tbl->complete);
254 spin_unlock(&tbl->slot_tbl_lock);
258 static int nfs4_begin_drain_session(struct nfs_client *clp)
260 struct nfs4_session *ses = clp->cl_session;
263 if (clp->cl_slot_tbl)
264 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
267 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
271 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
274 #if defined(CONFIG_NFS_V4_1)
276 static int nfs41_setup_state_renewal(struct nfs_client *clp)
279 struct nfs_fsinfo fsinfo;
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
288 status = nfs4_proc_get_lease_time(clp, &fsinfo);
290 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
291 nfs4_schedule_state_renewal(clp);
297 static void nfs41_finish_session_reset(struct nfs_client *clp)
299 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
300 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
301 /* create_session negotiated new slot table */
302 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
303 nfs41_setup_state_renewal(clp);
306 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
310 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
312 status = nfs4_proc_exchange_id(clp, cred);
315 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
317 status = nfs4_proc_create_session(clp, cred);
320 nfs41_finish_session_reset(clp);
321 nfs_mark_client_ready(clp, NFS_CS_READY);
327 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
329 * @clp: nfs_client under test
330 * @result: OUT: found nfs_client, or clp
331 * @cred: credential to use for trunking test
333 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
334 * If NFS4_OK is returned, an nfs_client pointer is planted in
337 * Note: The returned client may not yet be marked ready.
339 int nfs41_discover_server_trunking(struct nfs_client *clp,
340 struct nfs_client **result,
341 struct rpc_cred *cred)
345 status = nfs4_proc_exchange_id(clp, cred);
346 if (status != NFS4_OK)
349 status = nfs41_walk_client_list(clp, result, cred);
355 /* Purge state if the client id was established in a prior instance */
356 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
357 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
359 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
360 nfs4_schedule_state_manager(clp);
361 status = nfs_wait_client_init_complete(clp);
367 #endif /* CONFIG_NFS_V4_1 */
370 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
371 * @clp: client state handle
373 * Returns an rpc_cred with reference count bumped, or NULL.
375 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
377 struct rpc_cred *cred;
379 spin_lock(&clp->cl_lock);
380 cred = nfs4_get_machine_cred_locked(clp);
381 spin_unlock(&clp->cl_lock);
385 static struct nfs4_state_owner *
386 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
388 struct rb_node **p = &server->state_owners.rb_node,
390 struct nfs4_state_owner *sp;
394 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
396 if (cred < sp->so_cred)
397 p = &parent->rb_left;
398 else if (cred > sp->so_cred)
399 p = &parent->rb_right;
401 if (!list_empty(&sp->so_lru))
402 list_del_init(&sp->so_lru);
403 atomic_inc(&sp->so_count);
410 static struct nfs4_state_owner *
411 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
413 struct nfs_server *server = new->so_server;
414 struct rb_node **p = &server->state_owners.rb_node,
416 struct nfs4_state_owner *sp;
421 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
423 if (new->so_cred < sp->so_cred)
424 p = &parent->rb_left;
425 else if (new->so_cred > sp->so_cred)
426 p = &parent->rb_right;
428 if (!list_empty(&sp->so_lru))
429 list_del_init(&sp->so_lru);
430 atomic_inc(&sp->so_count);
434 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
437 rb_link_node(&new->so_server_node, parent, p);
438 rb_insert_color(&new->so_server_node, &server->state_owners);
443 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
445 struct nfs_server *server = sp->so_server;
447 if (!RB_EMPTY_NODE(&sp->so_server_node))
448 rb_erase(&sp->so_server_node, &server->state_owners);
449 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
453 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
455 sc->create_time = ktime_get();
458 spin_lock_init(&sc->lock);
459 INIT_LIST_HEAD(&sc->list);
460 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
464 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
466 rpc_destroy_wait_queue(&sc->wait);
470 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
471 * create a new state_owner.
474 static struct nfs4_state_owner *
475 nfs4_alloc_state_owner(struct nfs_server *server,
476 struct rpc_cred *cred,
479 struct nfs4_state_owner *sp;
481 sp = kzalloc(sizeof(*sp), gfp_flags);
484 sp->so_server = server;
485 sp->so_cred = get_rpccred(cred);
486 spin_lock_init(&sp->so_lock);
487 INIT_LIST_HEAD(&sp->so_states);
488 nfs4_init_seqid_counter(&sp->so_seqid);
489 atomic_set(&sp->so_count, 1);
490 INIT_LIST_HEAD(&sp->so_lru);
491 seqcount_init(&sp->so_reclaim_seqcount);
492 mutex_init(&sp->so_delegreturn_mutex);
497 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
499 /* This state_owner is no longer usable, but must
500 * remain in place so that state recovery can find it
501 * and the opens associated with it.
502 * It may also be used for new 'open' request to
503 * return a delegation to the server.
504 * So update the 'create_time' so that it looks like
505 * a new state_owner. This will cause the server to
506 * request an OPEN_CONFIRM to start a new sequence.
508 sp->so_seqid.create_time = ktime_get();
511 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
513 nfs4_destroy_seqid_counter(&sp->so_seqid);
514 put_rpccred(sp->so_cred);
518 static void nfs4_gc_state_owners(struct nfs_server *server)
520 struct nfs_client *clp = server->nfs_client;
521 struct nfs4_state_owner *sp, *tmp;
522 unsigned long time_min, time_max;
525 spin_lock(&clp->cl_lock);
527 time_min = (long)time_max - (long)clp->cl_lease_time;
528 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
529 /* NB: LRU is sorted so that oldest is at the head */
530 if (time_in_range(sp->so_expires, time_min, time_max))
532 list_move(&sp->so_lru, &doomed);
533 nfs4_remove_state_owner_locked(sp);
535 spin_unlock(&clp->cl_lock);
537 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
538 list_del(&sp->so_lru);
539 nfs4_free_state_owner(sp);
544 * nfs4_get_state_owner - Look up a state owner given a credential
545 * @server: nfs_server to search
546 * @cred: RPC credential to match
548 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
550 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
551 struct rpc_cred *cred,
554 struct nfs_client *clp = server->nfs_client;
555 struct nfs4_state_owner *sp, *new;
557 spin_lock(&clp->cl_lock);
558 sp = nfs4_find_state_owner_locked(server, cred);
559 spin_unlock(&clp->cl_lock);
562 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
566 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
568 spin_lock(&clp->cl_lock);
569 sp = nfs4_insert_state_owner_locked(new);
570 spin_unlock(&clp->cl_lock);
571 } while (sp == ERR_PTR(-EAGAIN));
573 nfs4_free_state_owner(new);
575 nfs4_gc_state_owners(server);
580 * nfs4_put_state_owner - Release a nfs4_state_owner
581 * @sp: state owner data to release
583 * Note that we keep released state owners on an LRU
585 * This caches valid state owners so that they can be
586 * reused, to avoid the OPEN_CONFIRM on minor version 0.
587 * It also pins the uniquifier of dropped state owners for
588 * a while, to ensure that those state owner names are
591 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
593 struct nfs_server *server = sp->so_server;
594 struct nfs_client *clp = server->nfs_client;
596 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
599 sp->so_expires = jiffies;
600 list_add_tail(&sp->so_lru, &server->state_owners_lru);
601 spin_unlock(&clp->cl_lock);
605 * nfs4_purge_state_owners - Release all cached state owners
606 * @server: nfs_server with cached state owners to release
608 * Called at umount time. Remaining state owners will be on
609 * the LRU with ref count of zero.
611 void nfs4_purge_state_owners(struct nfs_server *server)
613 struct nfs_client *clp = server->nfs_client;
614 struct nfs4_state_owner *sp, *tmp;
617 spin_lock(&clp->cl_lock);
618 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
619 list_move(&sp->so_lru, &doomed);
620 nfs4_remove_state_owner_locked(sp);
622 spin_unlock(&clp->cl_lock);
624 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
625 list_del(&sp->so_lru);
626 nfs4_free_state_owner(sp);
630 static struct nfs4_state *
631 nfs4_alloc_open_state(void)
633 struct nfs4_state *state;
635 state = kzalloc(sizeof(*state), GFP_NOFS);
638 atomic_set(&state->count, 1);
639 INIT_LIST_HEAD(&state->lock_states);
640 spin_lock_init(&state->state_lock);
641 seqlock_init(&state->seqlock);
646 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
648 if (state->state == fmode)
650 /* NB! List reordering - see the reclaim code for why. */
651 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
652 if (fmode & FMODE_WRITE)
653 list_move(&state->open_states, &state->owner->so_states);
655 list_move_tail(&state->open_states, &state->owner->so_states);
657 state->state = fmode;
660 static struct nfs4_state *
661 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
663 struct nfs_inode *nfsi = NFS_I(inode);
664 struct nfs4_state *state;
666 list_for_each_entry(state, &nfsi->open_states, inode_states) {
667 if (state->owner != owner)
669 if (!nfs4_valid_open_stateid(state))
671 if (atomic_inc_not_zero(&state->count))
678 nfs4_free_open_state(struct nfs4_state *state)
684 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
686 struct nfs4_state *state, *new;
687 struct nfs_inode *nfsi = NFS_I(inode);
689 spin_lock(&inode->i_lock);
690 state = __nfs4_find_state_byowner(inode, owner);
691 spin_unlock(&inode->i_lock);
694 new = nfs4_alloc_open_state();
695 spin_lock(&owner->so_lock);
696 spin_lock(&inode->i_lock);
697 state = __nfs4_find_state_byowner(inode, owner);
698 if (state == NULL && new != NULL) {
700 state->owner = owner;
701 atomic_inc(&owner->so_count);
702 list_add(&state->inode_states, &nfsi->open_states);
704 state->inode = inode;
705 spin_unlock(&inode->i_lock);
706 /* Note: The reclaim code dictates that we add stateless
707 * and read-only stateids to the end of the list */
708 list_add_tail(&state->open_states, &owner->so_states);
709 spin_unlock(&owner->so_lock);
711 spin_unlock(&inode->i_lock);
712 spin_unlock(&owner->so_lock);
714 nfs4_free_open_state(new);
720 void nfs4_put_open_state(struct nfs4_state *state)
722 struct inode *inode = state->inode;
723 struct nfs4_state_owner *owner = state->owner;
725 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
727 spin_lock(&inode->i_lock);
728 list_del(&state->inode_states);
729 list_del(&state->open_states);
730 spin_unlock(&inode->i_lock);
731 spin_unlock(&owner->so_lock);
733 nfs4_free_open_state(state);
734 nfs4_put_state_owner(owner);
738 * Close the current file.
740 static void __nfs4_close(struct nfs4_state *state,
741 fmode_t fmode, gfp_t gfp_mask, int wait)
743 struct nfs4_state_owner *owner = state->owner;
747 atomic_inc(&owner->so_count);
748 /* Protect against nfs4_find_state() */
749 spin_lock(&owner->so_lock);
750 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
757 case FMODE_READ|FMODE_WRITE:
760 newstate = FMODE_READ|FMODE_WRITE;
761 if (state->n_rdwr == 0) {
762 if (state->n_rdonly == 0) {
763 newstate &= ~FMODE_READ;
764 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
765 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
767 if (state->n_wronly == 0) {
768 newstate &= ~FMODE_WRITE;
769 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
770 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
773 clear_bit(NFS_DELEGATED_STATE, &state->flags);
775 nfs4_state_set_mode_locked(state, newstate);
776 spin_unlock(&owner->so_lock);
779 nfs4_put_open_state(state);
780 nfs4_put_state_owner(owner);
782 nfs4_do_close(state, gfp_mask, wait);
785 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
787 __nfs4_close(state, fmode, GFP_NOFS, 0);
790 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
792 __nfs4_close(state, fmode, GFP_KERNEL, 1);
796 * Search the state->lock_states for an existing lock_owner
797 * that is compatible with either of the given owners.
798 * If the second is non-zero, then the first refers to a Posix-lock
799 * owner (current->files) and the second refers to a flock/OFD
800 * owner (struct file*). In that case, prefer a match for the first
802 * If both sorts of locks are held on the one file we cannot know
803 * which stateid was intended to be used, so a "correct" choice cannot
804 * be made. Failing that, a "consistent" choice is preferable. The
805 * consistent choice we make is to prefer the first owner, that of a
808 static struct nfs4_lock_state *
809 __nfs4_find_lock_state(struct nfs4_state *state,
810 fl_owner_t fl_owner, fl_owner_t fl_owner2)
812 struct nfs4_lock_state *pos, *ret = NULL;
813 list_for_each_entry(pos, &state->lock_states, ls_locks) {
814 if (pos->ls_owner == fl_owner) {
818 if (pos->ls_owner == fl_owner2)
822 atomic_inc(&ret->ls_count);
827 * Return a compatible lock_state. If no initialized lock_state structure
828 * exists, return an uninitialized one.
831 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
833 struct nfs4_lock_state *lsp;
834 struct nfs_server *server = state->owner->so_server;
836 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
839 nfs4_init_seqid_counter(&lsp->ls_seqid);
840 atomic_set(&lsp->ls_count, 1);
841 lsp->ls_state = state;
842 lsp->ls_owner = fl_owner;
843 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
844 if (lsp->ls_seqid.owner_id < 0)
846 INIT_LIST_HEAD(&lsp->ls_locks);
853 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
855 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
856 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
861 * Return a compatible lock_state. If no initialized lock_state structure
862 * exists, return an uninitialized one.
865 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
867 struct nfs4_lock_state *lsp, *new = NULL;
870 spin_lock(&state->state_lock);
871 lsp = __nfs4_find_lock_state(state, owner, 0);
875 list_add(&new->ls_locks, &state->lock_states);
876 set_bit(LK_STATE_IN_USE, &state->flags);
881 spin_unlock(&state->state_lock);
882 new = nfs4_alloc_lock_state(state, owner);
886 spin_unlock(&state->state_lock);
888 nfs4_free_lock_state(state->owner->so_server, new);
893 * Release reference to lock_state, and free it if we see that
894 * it is no longer in use
896 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
898 struct nfs_server *server;
899 struct nfs4_state *state;
903 state = lsp->ls_state;
904 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
906 list_del(&lsp->ls_locks);
907 if (list_empty(&state->lock_states))
908 clear_bit(LK_STATE_IN_USE, &state->flags);
909 spin_unlock(&state->state_lock);
910 server = state->owner->so_server;
911 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
912 struct nfs_client *clp = server->nfs_client;
914 clp->cl_mvops->free_lock_state(server, lsp);
916 nfs4_free_lock_state(server, lsp);
919 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
921 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
923 dst->fl_u.nfs4_fl.owner = lsp;
924 atomic_inc(&lsp->ls_count);
927 static void nfs4_fl_release_lock(struct file_lock *fl)
929 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
932 static const struct file_lock_operations nfs4_fl_lock_ops = {
933 .fl_copy_lock = nfs4_fl_copy_lock,
934 .fl_release_private = nfs4_fl_release_lock,
937 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
939 struct nfs4_lock_state *lsp;
941 if (fl->fl_ops != NULL)
943 lsp = nfs4_get_lock_state(state, fl->fl_owner);
946 fl->fl_u.nfs4_fl.owner = lsp;
947 fl->fl_ops = &nfs4_fl_lock_ops;
951 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
952 struct nfs4_state *state,
953 const struct nfs_lock_context *l_ctx)
955 struct nfs4_lock_state *lsp;
956 fl_owner_t fl_owner, fl_flock_owner;
962 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
965 fl_owner = l_ctx->lockowner;
966 fl_flock_owner = l_ctx->open_context->flock_owner;
968 spin_lock(&state->state_lock);
969 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
970 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
972 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
973 nfs4_stateid_copy(dst, &lsp->ls_stateid);
976 spin_unlock(&state->state_lock);
977 nfs4_put_lock_state(lsp);
982 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
984 const nfs4_stateid *src;
989 seq = read_seqbegin(&state->seqlock);
990 if (test_bit(NFS_OPEN_STATE, &state->flags))
991 src = &state->open_stateid;
992 nfs4_stateid_copy(dst, src);
993 } while (read_seqretry(&state->seqlock, seq));
997 * Byte-range lock aware utility to initialize the stateid of read/write
1000 int nfs4_select_rw_stateid(struct nfs4_state *state,
1001 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1002 nfs4_stateid *dst, struct rpc_cred **cred)
1006 if (!nfs4_valid_open_stateid(state))
1010 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1012 /* A lost lock - don't even consider delegations */
1014 /* returns true if delegation stateid found and copied */
1015 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1020 /* nfs4_copy_delegation_stateid() didn't over-write
1021 * dst, so it still has the lock stateid which we now
1025 nfs4_copy_open_stateid(dst, state);
1028 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1033 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1035 struct nfs_seqid *new;
1037 new = kmalloc(sizeof(*new), gfp_mask);
1039 return ERR_PTR(-ENOMEM);
1040 new->sequence = counter;
1041 INIT_LIST_HEAD(&new->list);
1046 void nfs_release_seqid(struct nfs_seqid *seqid)
1048 struct nfs_seqid_counter *sequence;
1050 if (seqid == NULL || list_empty(&seqid->list))
1052 sequence = seqid->sequence;
1053 spin_lock(&sequence->lock);
1054 list_del_init(&seqid->list);
1055 if (!list_empty(&sequence->list)) {
1056 struct nfs_seqid *next;
1058 next = list_first_entry(&sequence->list,
1059 struct nfs_seqid, list);
1060 rpc_wake_up_queued_task(&sequence->wait, next->task);
1062 spin_unlock(&sequence->lock);
1065 void nfs_free_seqid(struct nfs_seqid *seqid)
1067 nfs_release_seqid(seqid);
1072 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1073 * failed with a seqid incrementing error -
1074 * see comments nfs4.h:seqid_mutating_error()
1076 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1081 case -NFS4ERR_BAD_SEQID:
1082 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1084 pr_warn_ratelimited("NFS: v4 server returned a bad"
1085 " sequence-id error on an"
1086 " unconfirmed sequence %p!\n",
1088 case -NFS4ERR_STALE_CLIENTID:
1089 case -NFS4ERR_STALE_STATEID:
1090 case -NFS4ERR_BAD_STATEID:
1091 case -NFS4ERR_BADXDR:
1092 case -NFS4ERR_RESOURCE:
1093 case -NFS4ERR_NOFILEHANDLE:
1094 case -NFS4ERR_MOVED:
1095 /* Non-seqid mutating errors */
1099 * Note: no locking needed as we are guaranteed to be first
1100 * on the sequence list
1102 seqid->sequence->counter++;
1105 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1107 struct nfs4_state_owner *sp;
1112 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1113 if (status == -NFS4ERR_BAD_SEQID)
1114 nfs4_reset_state_owner(sp);
1115 if (!nfs4_has_session(sp->so_server->nfs_client))
1116 nfs_increment_seqid(status, seqid);
1120 * Increment the seqid if the LOCK/LOCKU succeeded, or
1121 * failed with a seqid incrementing error -
1122 * see comments nfs4.h:seqid_mutating_error()
1124 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1127 nfs_increment_seqid(status, seqid);
1130 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1132 struct nfs_seqid_counter *sequence;
1137 sequence = seqid->sequence;
1138 spin_lock(&sequence->lock);
1140 if (list_empty(&seqid->list))
1141 list_add_tail(&seqid->list, &sequence->list);
1142 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1144 rpc_sleep_on(&sequence->wait, task, NULL);
1147 spin_unlock(&sequence->lock);
1152 static int nfs4_run_state_manager(void *);
1154 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1156 smp_mb__before_atomic();
1157 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1158 smp_mb__after_atomic();
1159 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1160 rpc_wake_up(&clp->cl_rpcwaitq);
1164 * Schedule the nfs_client asynchronous state management routine
1166 void nfs4_schedule_state_manager(struct nfs_client *clp)
1168 struct task_struct *task;
1169 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1171 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1173 __module_get(THIS_MODULE);
1174 atomic_inc(&clp->cl_count);
1176 /* The rcu_read_lock() is not strictly necessary, as the state
1177 * manager is the only thread that ever changes the rpc_xprt
1178 * after it's initialized. At this point, we're single threaded. */
1180 snprintf(buf, sizeof(buf), "%s-manager",
1181 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1183 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1185 printk(KERN_ERR "%s: kthread_run: %ld\n",
1186 __func__, PTR_ERR(task));
1187 nfs4_clear_state_manager_bit(clp);
1188 nfs_put_client(clp);
1189 module_put(THIS_MODULE);
1194 * Schedule a lease recovery attempt
1196 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1200 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1201 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1202 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1204 nfs4_schedule_state_manager(clp);
1206 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1209 * nfs4_schedule_migration_recovery - trigger migration recovery
1211 * @server: FSID that is migrating
1213 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1214 * value is returned.
1216 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1218 struct nfs_client *clp = server->nfs_client;
1220 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1221 pr_err("NFS: volatile file handles not supported (server %s)\n",
1226 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1229 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1231 (unsigned long long)server->fsid.major,
1232 (unsigned long long)server->fsid.minor,
1235 set_bit(NFS_MIG_IN_TRANSITION,
1236 &((struct nfs_server *)server)->mig_status);
1237 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1239 nfs4_schedule_state_manager(clp);
1242 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1245 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1247 * @clp: server to check for moved leases
1250 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1252 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1253 __func__, clp->cl_clientid, clp->cl_hostname);
1255 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1256 nfs4_schedule_state_manager(clp);
1258 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1260 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1266 atomic_inc(&clp->cl_count);
1267 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1268 nfs_wait_bit_killable, TASK_KILLABLE);
1271 if (clp->cl_cons_state < 0)
1272 res = clp->cl_cons_state;
1274 nfs_put_client(clp);
1278 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1283 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1284 ret = nfs4_wait_clnt_recover(clp);
1287 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1288 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1290 nfs4_schedule_state_manager(clp);
1297 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1298 * @clp: client to process
1300 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1301 * resend of the SETCLIENTID and hence re-establish the
1302 * callback channel. Then return all existing delegations.
1304 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1306 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1307 nfs_expire_all_delegations(clp);
1308 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1312 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1314 nfs40_handle_cb_pathdown(clp);
1315 nfs4_schedule_state_manager(clp);
1318 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1321 if (!nfs4_valid_open_stateid(state))
1323 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1324 /* Don't recover state that expired before the reboot */
1325 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1326 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1329 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1330 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1334 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1336 if (!nfs4_valid_open_stateid(state))
1338 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1339 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1340 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1341 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1345 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1347 struct nfs_client *clp = server->nfs_client;
1349 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1351 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1353 nfs4_schedule_state_manager(clp);
1356 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1358 static struct nfs4_lock_state *
1359 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1360 const nfs4_stateid *stateid)
1362 struct nfs4_lock_state *pos;
1364 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1365 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1367 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1373 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1374 const nfs4_stateid *stateid)
1378 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1379 spin_lock(&state->state_lock);
1380 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1382 spin_unlock(&state->state_lock);
1387 void nfs_inode_find_state_and_recover(struct inode *inode,
1388 const nfs4_stateid *stateid)
1390 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1391 struct nfs_inode *nfsi = NFS_I(inode);
1392 struct nfs_open_context *ctx;
1393 struct nfs4_state *state;
1396 spin_lock(&inode->i_lock);
1397 list_for_each_entry(ctx, &nfsi->open_files, list) {
1401 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1402 nfs4_state_mark_reclaim_nograce(clp, state)) {
1406 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1407 nfs4_state_mark_reclaim_nograce(clp, state))
1410 spin_unlock(&inode->i_lock);
1412 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1414 nfs4_schedule_state_manager(clp);
1417 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1419 struct inode *inode = state->inode;
1420 struct nfs_inode *nfsi = NFS_I(inode);
1421 struct nfs_open_context *ctx;
1423 spin_lock(&inode->i_lock);
1424 list_for_each_entry(ctx, &nfsi->open_files, list) {
1425 if (ctx->state != state)
1427 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1429 spin_unlock(&inode->i_lock);
1432 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1434 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1435 nfs4_state_mark_open_context_bad(state);
1439 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1441 struct inode *inode = state->inode;
1442 struct nfs_inode *nfsi = NFS_I(inode);
1443 struct file_lock *fl;
1445 struct file_lock_context *flctx = inode->i_flctx;
1446 struct list_head *list;
1451 list = &flctx->flc_posix;
1453 /* Guard against delegation returns and new lock/unlock calls */
1454 down_write(&nfsi->rwsem);
1455 spin_lock(&flctx->flc_lock);
1457 list_for_each_entry(fl, list, fl_list) {
1458 if (nfs_file_open_context(fl->fl_file)->state != state)
1460 spin_unlock(&flctx->flc_lock);
1461 status = ops->recover_lock(state, fl);
1466 case -NFS4ERR_ADMIN_REVOKED:
1467 case -NFS4ERR_STALE_STATEID:
1468 case -NFS4ERR_BAD_STATEID:
1469 case -NFS4ERR_EXPIRED:
1470 case -NFS4ERR_NO_GRACE:
1471 case -NFS4ERR_STALE_CLIENTID:
1472 case -NFS4ERR_BADSESSION:
1473 case -NFS4ERR_BADSLOT:
1474 case -NFS4ERR_BAD_HIGH_SLOT:
1475 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1478 pr_err("NFS: %s: unhandled error %d\n",
1481 case -NFS4ERR_DENIED:
1482 case -NFS4ERR_RECLAIM_BAD:
1483 case -NFS4ERR_RECLAIM_CONFLICT:
1484 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1487 spin_lock(&flctx->flc_lock);
1489 if (list == &flctx->flc_posix) {
1490 list = &flctx->flc_flock;
1493 spin_unlock(&flctx->flc_lock);
1495 up_write(&nfsi->rwsem);
1499 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1501 struct nfs4_state *state;
1502 struct nfs4_lock_state *lock;
1505 /* Note: we rely on the sp->so_states list being ordered
1506 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1508 * This is needed to ensure that the server won't give us any
1509 * read delegations that we have to return if, say, we are
1510 * recovering after a network partition or a reboot from a
1511 * server that doesn't support a grace period.
1513 spin_lock(&sp->so_lock);
1514 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1516 list_for_each_entry(state, &sp->so_states, open_states) {
1517 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1519 if (!nfs4_valid_open_stateid(state))
1521 if (state->state == 0)
1523 atomic_inc(&state->count);
1524 spin_unlock(&sp->so_lock);
1525 status = ops->recover_open(sp, state);
1527 status = nfs4_reclaim_locks(state, ops);
1529 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1530 spin_lock(&state->state_lock);
1531 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1532 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1533 pr_warn_ratelimited("NFS: "
1535 "failed!\n", __func__);
1537 spin_unlock(&state->state_lock);
1539 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1541 nfs4_put_open_state(state);
1542 spin_lock(&sp->so_lock);
1548 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1556 /* Open state on this file cannot be recovered */
1557 nfs4_state_mark_recovery_failed(state, status);
1561 case -NFS4ERR_ADMIN_REVOKED:
1562 case -NFS4ERR_STALE_STATEID:
1563 case -NFS4ERR_OLD_STATEID:
1564 case -NFS4ERR_BAD_STATEID:
1565 case -NFS4ERR_RECLAIM_BAD:
1566 case -NFS4ERR_RECLAIM_CONFLICT:
1567 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1569 case -NFS4ERR_EXPIRED:
1570 case -NFS4ERR_NO_GRACE:
1571 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1572 case -NFS4ERR_STALE_CLIENTID:
1573 case -NFS4ERR_BADSESSION:
1574 case -NFS4ERR_BADSLOT:
1575 case -NFS4ERR_BAD_HIGH_SLOT:
1576 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1579 nfs4_put_open_state(state);
1580 spin_lock(&sp->so_lock);
1583 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1584 spin_unlock(&sp->so_lock);
1587 nfs4_put_open_state(state);
1588 spin_lock(&sp->so_lock);
1589 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1590 spin_unlock(&sp->so_lock);
1594 static void nfs4_clear_open_state(struct nfs4_state *state)
1596 struct nfs4_lock_state *lock;
1598 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1599 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1600 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1601 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1602 spin_lock(&state->state_lock);
1603 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1604 lock->ls_seqid.flags = 0;
1605 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1607 spin_unlock(&state->state_lock);
1610 static void nfs4_reset_seqids(struct nfs_server *server,
1611 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1613 struct nfs_client *clp = server->nfs_client;
1614 struct nfs4_state_owner *sp;
1615 struct rb_node *pos;
1616 struct nfs4_state *state;
1618 spin_lock(&clp->cl_lock);
1619 for (pos = rb_first(&server->state_owners);
1621 pos = rb_next(pos)) {
1622 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1623 sp->so_seqid.flags = 0;
1624 spin_lock(&sp->so_lock);
1625 list_for_each_entry(state, &sp->so_states, open_states) {
1626 if (mark_reclaim(clp, state))
1627 nfs4_clear_open_state(state);
1629 spin_unlock(&sp->so_lock);
1631 spin_unlock(&clp->cl_lock);
1634 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1635 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1637 struct nfs_server *server;
1640 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1641 nfs4_reset_seqids(server, mark_reclaim);
1645 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1647 /* Mark all delegations for reclaim */
1648 nfs_delegation_mark_reclaim(clp);
1649 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1652 static void nfs4_reclaim_complete(struct nfs_client *clp,
1653 const struct nfs4_state_recovery_ops *ops,
1654 struct rpc_cred *cred)
1656 /* Notify the server we're done reclaiming our state */
1657 if (ops->reclaim_complete)
1658 (void)ops->reclaim_complete(clp, cred);
1661 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1663 struct nfs_client *clp = server->nfs_client;
1664 struct nfs4_state_owner *sp;
1665 struct rb_node *pos;
1666 struct nfs4_state *state;
1668 spin_lock(&clp->cl_lock);
1669 for (pos = rb_first(&server->state_owners);
1671 pos = rb_next(pos)) {
1672 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1673 spin_lock(&sp->so_lock);
1674 list_for_each_entry(state, &sp->so_states, open_states) {
1675 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1678 nfs4_state_mark_reclaim_nograce(clp, state);
1680 spin_unlock(&sp->so_lock);
1682 spin_unlock(&clp->cl_lock);
1685 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1687 struct nfs_server *server;
1689 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1693 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1694 nfs4_clear_reclaim_server(server);
1697 nfs_delegation_reap_unclaimed(clp);
1701 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1703 const struct nfs4_state_recovery_ops *ops;
1704 struct rpc_cred *cred;
1706 if (!nfs4_state_clear_reclaim_reboot(clp))
1708 ops = clp->cl_mvops->reboot_recovery_ops;
1709 cred = nfs4_get_clid_cred(clp);
1710 nfs4_reclaim_complete(clp, ops, cred);
1714 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1716 nfs_mark_test_expired_all_delegations(clp);
1717 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1720 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1725 case -NFS4ERR_CB_PATH_DOWN:
1726 nfs40_handle_cb_pathdown(clp);
1728 case -NFS4ERR_NO_GRACE:
1729 nfs4_state_end_reclaim_reboot(clp);
1731 case -NFS4ERR_STALE_CLIENTID:
1732 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1733 nfs4_state_start_reclaim_reboot(clp);
1735 case -NFS4ERR_EXPIRED:
1736 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1737 nfs4_state_start_reclaim_nograce(clp);
1739 case -NFS4ERR_BADSESSION:
1740 case -NFS4ERR_BADSLOT:
1741 case -NFS4ERR_BAD_HIGH_SLOT:
1742 case -NFS4ERR_DEADSESSION:
1743 case -NFS4ERR_SEQ_FALSE_RETRY:
1744 case -NFS4ERR_SEQ_MISORDERED:
1745 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1746 /* Zero session reset errors */
1748 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1749 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1752 dprintk("%s: failed to handle error %d for server %s\n",
1753 __func__, error, clp->cl_hostname);
1756 dprintk("%s: handled error %d for server %s\n", __func__, error,
1761 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1763 struct nfs4_state_owner *sp;
1764 struct nfs_server *server;
1765 struct rb_node *pos;
1770 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1771 nfs4_purge_state_owners(server);
1772 spin_lock(&clp->cl_lock);
1773 for (pos = rb_first(&server->state_owners);
1775 pos = rb_next(pos)) {
1777 struct nfs4_state_owner, so_server_node);
1778 if (!test_and_clear_bit(ops->owner_flag_bit,
1781 if (!atomic_inc_not_zero(&sp->so_count))
1783 spin_unlock(&clp->cl_lock);
1786 status = nfs4_reclaim_open_state(sp, ops);
1788 set_bit(ops->owner_flag_bit, &sp->so_flags);
1789 nfs4_put_state_owner(sp);
1790 status = nfs4_recovery_handle_error(clp, status);
1791 return (status != 0) ? status : -EAGAIN;
1794 nfs4_put_state_owner(sp);
1797 spin_unlock(&clp->cl_lock);
1803 static int nfs4_check_lease(struct nfs_client *clp)
1805 struct rpc_cred *cred;
1806 const struct nfs4_state_maintenance_ops *ops =
1807 clp->cl_mvops->state_renewal_ops;
1810 /* Is the client already known to have an expired lease? */
1811 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1813 spin_lock(&clp->cl_lock);
1814 cred = ops->get_state_renewal_cred_locked(clp);
1815 spin_unlock(&clp->cl_lock);
1817 cred = nfs4_get_clid_cred(clp);
1822 status = ops->renew_lease(clp, cred);
1824 if (status == -ETIMEDOUT) {
1825 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1829 return nfs4_recovery_handle_error(clp, status);
1832 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1833 * and for recoverable errors on EXCHANGE_ID for v4.1
1835 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1838 case -NFS4ERR_SEQ_MISORDERED:
1839 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1840 return -ESERVERFAULT;
1841 /* Lease confirmation error: retry after purging the lease */
1843 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1845 case -NFS4ERR_STALE_CLIENTID:
1846 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1847 nfs4_state_start_reclaim_reboot(clp);
1849 case -NFS4ERR_CLID_INUSE:
1850 pr_err("NFS: Server %s reports our clientid is in use\n",
1852 nfs_mark_client_ready(clp, -EPERM);
1853 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1856 case -NFS4ERR_DELAY:
1862 case -NFS4ERR_MINOR_VERS_MISMATCH:
1863 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1864 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1865 dprintk("%s: exit with error %d for server %s\n",
1866 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1867 return -EPROTONOSUPPORT;
1868 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1869 * in nfs4_exchange_id */
1871 dprintk("%s: exit with error %d for server %s\n", __func__,
1872 status, clp->cl_hostname);
1875 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1876 dprintk("%s: handled error %d for server %s\n", __func__, status,
1881 static int nfs4_establish_lease(struct nfs_client *clp)
1883 struct rpc_cred *cred;
1884 const struct nfs4_state_recovery_ops *ops =
1885 clp->cl_mvops->reboot_recovery_ops;
1888 nfs4_begin_drain_session(clp);
1889 cred = nfs4_get_clid_cred(clp);
1892 status = ops->establish_clid(clp, cred);
1896 pnfs_destroy_all_layouts(clp);
1901 * Returns zero or a negative errno. NFS4ERR values are converted
1902 * to local errno values.
1904 static int nfs4_reclaim_lease(struct nfs_client *clp)
1908 status = nfs4_establish_lease(clp);
1910 return nfs4_handle_reclaim_lease_error(clp, status);
1911 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1912 nfs4_state_start_reclaim_nograce(clp);
1913 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1914 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1915 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1916 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1920 static int nfs4_purge_lease(struct nfs_client *clp)
1924 status = nfs4_establish_lease(clp);
1926 return nfs4_handle_reclaim_lease_error(clp, status);
1927 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1928 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1929 nfs4_state_start_reclaim_nograce(clp);
1934 * Try remote migration of one FSID from a source server to a
1935 * destination server. The source server provides a list of
1936 * potential destinations.
1938 * Returns zero or a negative NFS4ERR status code.
1940 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1942 struct nfs_client *clp = server->nfs_client;
1943 struct nfs4_fs_locations *locations = NULL;
1944 struct inode *inode;
1948 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1949 (unsigned long long)server->fsid.major,
1950 (unsigned long long)server->fsid.minor,
1954 page = alloc_page(GFP_KERNEL);
1955 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1956 if (page == NULL || locations == NULL) {
1957 dprintk("<-- %s: no memory\n", __func__);
1961 inode = d_inode(server->super->s_root);
1962 result = nfs4_proc_get_locations(inode, locations, page, cred);
1964 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1969 result = -NFS4ERR_NXIO;
1970 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1971 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1976 nfs4_begin_drain_session(clp);
1978 status = nfs4_replace_transport(server, locations);
1980 dprintk("<-- %s: failed to replace transport: %d\n",
1986 dprintk("<-- %s: migration succeeded\n", __func__);
1993 pr_err("NFS: migration recovery failed (server %s)\n",
1995 set_bit(NFS_MIG_FAILED, &server->mig_status);
2001 * Returns zero or a negative NFS4ERR status code.
2003 static int nfs4_handle_migration(struct nfs_client *clp)
2005 const struct nfs4_state_maintenance_ops *ops =
2006 clp->cl_mvops->state_renewal_ops;
2007 struct nfs_server *server;
2008 struct rpc_cred *cred;
2010 dprintk("%s: migration reported on \"%s\"\n", __func__,
2013 spin_lock(&clp->cl_lock);
2014 cred = ops->get_state_renewal_cred_locked(clp);
2015 spin_unlock(&clp->cl_lock);
2017 return -NFS4ERR_NOENT;
2022 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2025 if (server->mig_gen == clp->cl_mig_gen)
2027 server->mig_gen = clp->cl_mig_gen;
2029 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2030 &server->mig_status))
2034 status = nfs4_try_migration(server, cred);
2047 * Test each nfs_server on the clp's cl_superblocks list to see
2048 * if it's moved to another server. Stop when the server no longer
2049 * returns NFS4ERR_LEASE_MOVED.
2051 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2053 const struct nfs4_state_maintenance_ops *ops =
2054 clp->cl_mvops->state_renewal_ops;
2055 struct nfs_server *server;
2056 struct rpc_cred *cred;
2058 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2061 spin_lock(&clp->cl_lock);
2062 cred = ops->get_state_renewal_cred_locked(clp);
2063 spin_unlock(&clp->cl_lock);
2065 return -NFS4ERR_NOENT;
2070 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2071 struct inode *inode;
2074 if (server->mig_gen == clp->cl_mig_gen)
2076 server->mig_gen = clp->cl_mig_gen;
2080 inode = d_inode(server->super->s_root);
2081 status = nfs4_proc_fsid_present(inode, cred);
2082 if (status != -NFS4ERR_MOVED)
2083 goto restart; /* wasn't this one */
2084 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2085 goto restart; /* there are more */
2096 * nfs4_discover_server_trunking - Detect server IP address trunking
2098 * @clp: nfs_client under test
2099 * @result: OUT: found nfs_client, or clp
2101 * Returns zero or a negative errno. If zero is returned,
2102 * an nfs_client pointer is planted in "result".
2104 * Note: since we are invoked in process context, and
2105 * not from inside the state manager, we cannot use
2106 * nfs4_handle_reclaim_lease_error().
2108 int nfs4_discover_server_trunking(struct nfs_client *clp,
2109 struct nfs_client **result)
2111 const struct nfs4_state_recovery_ops *ops =
2112 clp->cl_mvops->reboot_recovery_ops;
2113 struct rpc_clnt *clnt;
2114 struct rpc_cred *cred;
2117 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2119 clnt = clp->cl_rpcclient;
2122 mutex_lock(&nfs_clid_init_mutex);
2125 cred = nfs4_get_clid_cred(clp);
2129 status = ops->detect_trunking(clp, result, cred);
2135 if (clnt->cl_softrtry)
2137 case -NFS4ERR_DELAY:
2140 case -NFS4ERR_STALE_CLIENTID:
2141 dprintk("NFS: %s after status %d, retrying\n",
2146 nfs4_root_machine_cred(clp);
2149 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2151 case -NFS4ERR_CLID_INUSE:
2152 case -NFS4ERR_WRONGSEC:
2153 /* No point in retrying if we already used RPC_AUTH_UNIX */
2154 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2158 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2160 status = PTR_ERR(clnt);
2163 /* Note: this is safe because we haven't yet marked the
2164 * client as ready, so we are the only user of
2167 clnt = xchg(&clp->cl_rpcclient, clnt);
2168 rpc_shutdown_client(clnt);
2169 clnt = clp->cl_rpcclient;
2172 case -NFS4ERR_MINOR_VERS_MISMATCH:
2173 status = -EPROTONOSUPPORT;
2177 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2178 * in nfs4_exchange_id */
2179 status = -EKEYEXPIRED;
2182 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2188 mutex_unlock(&nfs_clid_init_mutex);
2189 dprintk("NFS: %s: status = %d\n", __func__, status);
2193 #ifdef CONFIG_NFS_V4_1
2194 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2196 struct nfs_client *clp = session->clp;
2200 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2202 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2203 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2205 nfs4_schedule_state_manager(clp);
2207 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2209 void nfs41_notify_server(struct nfs_client *clp)
2211 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2212 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2213 nfs4_schedule_state_manager(clp);
2216 static void nfs4_reset_all_state(struct nfs_client *clp)
2218 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2219 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2220 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2221 nfs4_state_start_reclaim_nograce(clp);
2222 dprintk("%s: scheduling reset of all state for server %s!\n",
2223 __func__, clp->cl_hostname);
2224 nfs4_schedule_state_manager(clp);
2228 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2230 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2231 nfs4_state_start_reclaim_reboot(clp);
2232 dprintk("%s: server %s rebooted!\n", __func__,
2234 nfs4_schedule_state_manager(clp);
2238 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2240 nfs4_reset_all_state(clp);
2241 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2244 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2246 nfs4_state_start_reclaim_nograce(clp);
2247 nfs4_schedule_state_manager(clp);
2249 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2252 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2254 /* FIXME: For now, we destroy all layouts. */
2255 pnfs_destroy_all_layouts(clp);
2256 /* FIXME: For now, we test all delegations+open state+locks. */
2257 nfs41_handle_some_state_revoked(clp);
2258 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2262 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2264 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2265 nfs4_schedule_state_manager(clp);
2267 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2271 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2273 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2274 &clp->cl_state) == 0)
2275 nfs4_schedule_state_manager(clp);
2278 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2284 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2285 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2287 * If we're called from the state manager thread, then assume we're
2288 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2289 * Those flags are expected to remain set until we're done
2290 * recovering (see RFC5661, section 18.46.3).
2295 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2296 nfs41_handle_server_reboot(clp);
2297 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2298 nfs41_handle_all_state_revoked(clp);
2299 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2300 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2301 nfs41_handle_some_state_revoked(clp);
2302 if (flags & SEQ4_STATUS_LEASE_MOVED)
2303 nfs4_schedule_lease_moved_recovery(clp);
2304 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2305 nfs41_handle_recallable_state_revoked(clp);
2307 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2308 nfs41_handle_backchannel_fault(clp);
2309 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2310 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2311 nfs41_handle_cb_path_down(clp);
2314 static int nfs4_reset_session(struct nfs_client *clp)
2316 struct rpc_cred *cred;
2319 if (!nfs4_has_session(clp))
2321 nfs4_begin_drain_session(clp);
2322 cred = nfs4_get_clid_cred(clp);
2323 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2326 case -NFS4ERR_BADSESSION:
2327 case -NFS4ERR_DEADSESSION:
2329 case -NFS4ERR_BACK_CHAN_BUSY:
2330 case -NFS4ERR_DELAY:
2331 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2336 status = nfs4_recovery_handle_error(clp, status);
2340 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2341 status = nfs4_proc_create_session(clp, cred);
2343 dprintk("%s: session reset failed with status %d for server %s!\n",
2344 __func__, status, clp->cl_hostname);
2345 status = nfs4_handle_reclaim_lease_error(clp, status);
2348 nfs41_finish_session_reset(clp);
2349 dprintk("%s: session reset was successful for server %s!\n",
2350 __func__, clp->cl_hostname);
2357 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2359 struct rpc_cred *cred;
2362 if (!nfs4_has_session(clp))
2364 nfs4_begin_drain_session(clp);
2365 cred = nfs4_get_clid_cred(clp);
2366 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2369 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2372 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2373 __func__, clp->cl_hostname);
2375 case -NFS4ERR_DELAY:
2377 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2380 return nfs4_recovery_handle_error(clp, ret);
2384 #else /* CONFIG_NFS_V4_1 */
2385 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2387 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2391 #endif /* CONFIG_NFS_V4_1 */
2393 static void nfs4_state_manager(struct nfs_client *clp)
2396 const char *section = "", *section_sep = "";
2398 /* Ensure exclusive access to NFSv4 state */
2400 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2401 section = "purge state";
2402 status = nfs4_purge_lease(clp);
2408 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2409 section = "lease expired";
2410 /* We're going to have to re-establish a clientid */
2411 status = nfs4_reclaim_lease(clp);
2417 /* Initialize or reset the session */
2418 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2419 section = "reset session";
2420 status = nfs4_reset_session(clp);
2421 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2427 /* Send BIND_CONN_TO_SESSION */
2428 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2430 section = "bind conn to session";
2431 status = nfs4_bind_conn_to_session(clp);
2437 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2438 section = "check lease";
2439 status = nfs4_check_lease(clp);
2445 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2446 section = "migration";
2447 status = nfs4_handle_migration(clp);
2452 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2453 section = "lease moved";
2454 status = nfs4_handle_lease_moved(clp);
2459 /* First recover reboot state... */
2460 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2461 section = "reclaim reboot";
2462 status = nfs4_do_reclaim(clp,
2463 clp->cl_mvops->reboot_recovery_ops);
2464 if (status == -EAGAIN)
2468 nfs4_state_end_reclaim_reboot(clp);
2471 /* Detect expired delegations... */
2472 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2473 section = "detect expired delegations";
2474 nfs_reap_expired_delegations(clp);
2478 /* Now recover expired state... */
2479 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2480 section = "reclaim nograce";
2481 status = nfs4_do_reclaim(clp,
2482 clp->cl_mvops->nograce_recovery_ops);
2483 if (status == -EAGAIN)
2489 nfs4_end_drain_session(clp);
2490 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2491 nfs_client_return_marked_delegations(clp);
2495 nfs4_clear_state_manager_bit(clp);
2496 /* Did we race with an attempt to give us more work? */
2497 if (clp->cl_state == 0)
2499 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2501 } while (atomic_read(&clp->cl_count) > 1);
2504 if (strlen(section))
2506 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2507 " with error %d\n", section_sep, section,
2508 clp->cl_hostname, -status);
2510 nfs4_end_drain_session(clp);
2511 nfs4_clear_state_manager_bit(clp);
2514 static int nfs4_run_state_manager(void *ptr)
2516 struct nfs_client *clp = ptr;
2518 allow_signal(SIGKILL);
2519 nfs4_state_manager(clp);
2520 nfs_put_client(clp);
2521 module_put_and_exit(0);