4 * Client-side XDR for NFSv4.
6 * Copyright (c) 2002 The Regents of the University of Michigan.
9 * Kendrick Smith <kmsmith@umich.edu>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
41 #include <linux/kernel.h>
42 #include <linux/slab.h>
44 #include <linux/nfs_fs.h>
45 #include <linux/kthread.h>
46 #include <linux/module.h>
47 #include <linux/random.h>
48 #include <linux/ratelimit.h>
49 #include <linux/workqueue.h>
50 #include <linux/bitops.h>
51 #include <linux/jiffies.h>
53 #include <linux/sunrpc/clnt.h>
57 #include "delegation.h"
59 #include "nfs4idmap.h"
60 #include "nfs4session.h"
64 #define NFSDBG_FACILITY NFSDBG_STATE
66 #define OPENOWNER_POOL_SIZE 8
68 const nfs4_stateid zero_stateid = {
70 .type = NFS4_SPECIAL_STATEID_TYPE,
72 const nfs4_stateid invalid_stateid = {
74 /* Funky initialiser keeps older gcc versions happy */
75 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
77 .type = NFS4_INVALID_STATEID_TYPE,
80 const nfs4_stateid current_stateid = {
82 /* Funky initialiser keeps older gcc versions happy */
83 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
85 .type = NFS4_SPECIAL_STATEID_TYPE,
88 static DEFINE_MUTEX(nfs_clid_init_mutex);
90 static int nfs4_setup_state_renewal(struct nfs_client *clp)
93 struct nfs_fsinfo fsinfo;
96 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
97 nfs4_schedule_state_renewal(clp);
102 status = nfs4_proc_get_lease_time(clp, &fsinfo);
104 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
105 nfs4_schedule_state_renewal(clp);
111 int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred)
113 struct nfs4_setclientid_res clid = {
114 .clientid = clp->cl_clientid,
115 .confirm = clp->cl_confirm,
119 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
121 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
123 port = nn->nfs_callback_tcpport;
124 if (clp->cl_addr.ss_family == AF_INET6)
125 port = nn->nfs_callback_tcpport6;
127 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
130 clp->cl_clientid = clid.clientid;
131 clp->cl_confirm = clid.confirm;
132 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
134 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
137 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
138 nfs4_setup_state_renewal(clp);
144 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
146 * @clp: nfs_client under test
147 * @result: OUT: found nfs_client, or clp
148 * @cred: credential to use for trunking test
150 * Returns zero, a negative errno, or a negative NFS4ERR status.
151 * If zero is returned, an nfs_client pointer is planted in
154 * Note: The returned client may not yet be marked ready.
156 int nfs40_discover_server_trunking(struct nfs_client *clp,
157 struct nfs_client **result,
158 const struct cred *cred)
160 struct nfs4_setclientid_res clid = {
161 .clientid = clp->cl_clientid,
162 .confirm = clp->cl_confirm,
164 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
168 port = nn->nfs_callback_tcpport;
169 if (clp->cl_addr.ss_family == AF_INET6)
170 port = nn->nfs_callback_tcpport6;
172 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
175 clp->cl_clientid = clid.clientid;
176 clp->cl_confirm = clid.confirm;
178 status = nfs40_walk_client_list(clp, result, cred);
180 /* Sustain the lease, even if it's empty. If the clientid4
181 * goes stale it's of no use for trunking discovery. */
182 nfs4_schedule_state_renewal(*result);
184 /* If the client state need to recover, do it. */
186 nfs4_schedule_state_manager(clp);
192 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp)
194 return get_cred(rpc_machine_cred());
197 static void nfs4_root_machine_cred(struct nfs_client *clp)
200 /* Force root creds instead of machine */
201 clp->cl_principal = NULL;
202 clp->cl_rpcclient->cl_principal = NULL;
205 static const struct cred *
206 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
208 const struct cred *cred = NULL;
209 struct nfs4_state_owner *sp;
212 for (pos = rb_first(&server->state_owners);
214 pos = rb_next(pos)) {
215 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
216 if (list_empty(&sp->so_states))
218 cred = get_cred(sp->so_cred);
225 * nfs4_get_renew_cred - Acquire credential for a renew operation
226 * @clp: client state handle
228 * Returns an rpc_cred with reference count bumped, or NULL.
229 * Caller must hold clp->cl_lock.
231 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp)
233 const struct cred *cred = NULL;
234 struct nfs_server *server;
236 /* Use machine credentials if available */
237 cred = nfs4_get_machine_cred(clp);
241 spin_lock(&clp->cl_lock);
243 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
244 cred = nfs4_get_renew_cred_server_locked(server);
249 spin_unlock(&clp->cl_lock);
255 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
257 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
258 spin_lock(&tbl->slot_tbl_lock);
259 nfs41_wake_slot_table(tbl);
260 spin_unlock(&tbl->slot_tbl_lock);
264 static void nfs4_end_drain_session(struct nfs_client *clp)
266 struct nfs4_session *ses = clp->cl_session;
268 if (clp->cl_slot_tbl) {
269 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
274 nfs4_end_drain_slot_table(&ses->bc_slot_table);
275 nfs4_end_drain_slot_table(&ses->fc_slot_table);
279 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
281 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
282 spin_lock(&tbl->slot_tbl_lock);
283 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
284 reinit_completion(&tbl->complete);
285 spin_unlock(&tbl->slot_tbl_lock);
286 return wait_for_completion_interruptible(&tbl->complete);
288 spin_unlock(&tbl->slot_tbl_lock);
292 static int nfs4_begin_drain_session(struct nfs_client *clp)
294 struct nfs4_session *ses = clp->cl_session;
297 if (clp->cl_slot_tbl)
298 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
301 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
305 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
308 #if defined(CONFIG_NFS_V4_1)
310 static void nfs41_finish_session_reset(struct nfs_client *clp)
312 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
313 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
314 /* create_session negotiated new slot table */
315 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
316 nfs4_setup_state_renewal(clp);
319 int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred)
323 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
325 status = nfs4_proc_exchange_id(clp, cred);
328 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
330 status = nfs4_proc_create_session(clp, cred);
333 nfs41_finish_session_reset(clp);
334 nfs_mark_client_ready(clp, NFS_CS_READY);
340 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
342 * @clp: nfs_client under test
343 * @result: OUT: found nfs_client, or clp
344 * @cred: credential to use for trunking test
346 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
347 * If NFS4_OK is returned, an nfs_client pointer is planted in
350 * Note: The returned client may not yet be marked ready.
352 int nfs41_discover_server_trunking(struct nfs_client *clp,
353 struct nfs_client **result,
354 const struct cred *cred)
358 status = nfs4_proc_exchange_id(clp, cred);
359 if (status != NFS4_OK)
362 status = nfs41_walk_client_list(clp, result, cred);
369 * Purge state if the client id was established in a prior
370 * instance and the client id could not have arrived on the
371 * server via Transparent State Migration.
373 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
374 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
375 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
377 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
379 nfs4_schedule_state_manager(clp);
380 status = nfs_wait_client_init_complete(clp);
386 #endif /* CONFIG_NFS_V4_1 */
389 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
390 * @clp: client state handle
392 * Returns a cred with reference count bumped, or NULL.
394 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp)
396 const struct cred *cred;
398 cred = nfs4_get_machine_cred(clp);
402 static struct nfs4_state_owner *
403 nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred)
405 struct rb_node **p = &server->state_owners.rb_node,
407 struct nfs4_state_owner *sp;
412 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
413 cmp = cred_fscmp(cred, sp->so_cred);
416 p = &parent->rb_left;
418 p = &parent->rb_right;
420 if (!list_empty(&sp->so_lru))
421 list_del_init(&sp->so_lru);
422 atomic_inc(&sp->so_count);
429 static struct nfs4_state_owner *
430 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
432 struct nfs_server *server = new->so_server;
433 struct rb_node **p = &server->state_owners.rb_node,
435 struct nfs4_state_owner *sp;
440 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
441 cmp = cred_fscmp(new->so_cred, sp->so_cred);
444 p = &parent->rb_left;
446 p = &parent->rb_right;
448 if (!list_empty(&sp->so_lru))
449 list_del_init(&sp->so_lru);
450 atomic_inc(&sp->so_count);
454 rb_link_node(&new->so_server_node, parent, p);
455 rb_insert_color(&new->so_server_node, &server->state_owners);
460 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
462 struct nfs_server *server = sp->so_server;
464 if (!RB_EMPTY_NODE(&sp->so_server_node))
465 rb_erase(&sp->so_server_node, &server->state_owners);
469 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
471 sc->create_time = ktime_get();
474 spin_lock_init(&sc->lock);
475 INIT_LIST_HEAD(&sc->list);
476 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
480 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
482 rpc_destroy_wait_queue(&sc->wait);
486 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
487 * create a new state_owner.
490 static struct nfs4_state_owner *
491 nfs4_alloc_state_owner(struct nfs_server *server,
492 const struct cred *cred,
495 struct nfs4_state_owner *sp;
497 sp = kzalloc(sizeof(*sp), gfp_flags);
500 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
502 if (sp->so_seqid.owner_id < 0) {
506 sp->so_server = server;
507 sp->so_cred = get_cred(cred);
508 spin_lock_init(&sp->so_lock);
509 INIT_LIST_HEAD(&sp->so_states);
510 nfs4_init_seqid_counter(&sp->so_seqid);
511 atomic_set(&sp->so_count, 1);
512 INIT_LIST_HEAD(&sp->so_lru);
513 seqcount_init(&sp->so_reclaim_seqcount);
514 mutex_init(&sp->so_delegreturn_mutex);
519 nfs4_reset_state_owner(struct nfs4_state_owner *sp)
521 /* This state_owner is no longer usable, but must
522 * remain in place so that state recovery can find it
523 * and the opens associated with it.
524 * It may also be used for new 'open' request to
525 * return a delegation to the server.
526 * So update the 'create_time' so that it looks like
527 * a new state_owner. This will cause the server to
528 * request an OPEN_CONFIRM to start a new sequence.
530 sp->so_seqid.create_time = ktime_get();
533 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
535 nfs4_destroy_seqid_counter(&sp->so_seqid);
536 put_cred(sp->so_cred);
537 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
541 static void nfs4_gc_state_owners(struct nfs_server *server)
543 struct nfs_client *clp = server->nfs_client;
544 struct nfs4_state_owner *sp, *tmp;
545 unsigned long time_min, time_max;
548 spin_lock(&clp->cl_lock);
550 time_min = (long)time_max - (long)clp->cl_lease_time;
551 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
552 /* NB: LRU is sorted so that oldest is at the head */
553 if (time_in_range(sp->so_expires, time_min, time_max))
555 list_move(&sp->so_lru, &doomed);
556 nfs4_remove_state_owner_locked(sp);
558 spin_unlock(&clp->cl_lock);
560 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
561 list_del(&sp->so_lru);
562 nfs4_free_state_owner(sp);
567 * nfs4_get_state_owner - Look up a state owner given a credential
568 * @server: nfs_server to search
569 * @cred: RPC credential to match
570 * @gfp_flags: allocation mode
572 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
574 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
575 const struct cred *cred,
578 struct nfs_client *clp = server->nfs_client;
579 struct nfs4_state_owner *sp, *new;
581 spin_lock(&clp->cl_lock);
582 sp = nfs4_find_state_owner_locked(server, cred);
583 spin_unlock(&clp->cl_lock);
586 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
589 spin_lock(&clp->cl_lock);
590 sp = nfs4_insert_state_owner_locked(new);
591 spin_unlock(&clp->cl_lock);
593 nfs4_free_state_owner(new);
595 nfs4_gc_state_owners(server);
600 * nfs4_put_state_owner - Release a nfs4_state_owner
601 * @sp: state owner data to release
603 * Note that we keep released state owners on an LRU
605 * This caches valid state owners so that they can be
606 * reused, to avoid the OPEN_CONFIRM on minor version 0.
607 * It also pins the uniquifier of dropped state owners for
608 * a while, to ensure that those state owner names are
611 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
613 struct nfs_server *server = sp->so_server;
614 struct nfs_client *clp = server->nfs_client;
616 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
619 sp->so_expires = jiffies;
620 list_add_tail(&sp->so_lru, &server->state_owners_lru);
621 spin_unlock(&clp->cl_lock);
625 * nfs4_purge_state_owners - Release all cached state owners
626 * @server: nfs_server with cached state owners to release
627 * @head: resulting list of state owners
629 * Called at umount time. Remaining state owners will be on
630 * the LRU with ref count of zero.
631 * Note that the state owners are not freed, but are added
632 * to the list @head, which can later be used as an argument
633 * to nfs4_free_state_owners.
635 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
637 struct nfs_client *clp = server->nfs_client;
638 struct nfs4_state_owner *sp, *tmp;
640 spin_lock(&clp->cl_lock);
641 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
642 list_move(&sp->so_lru, head);
643 nfs4_remove_state_owner_locked(sp);
645 spin_unlock(&clp->cl_lock);
649 * nfs4_purge_state_owners - Release all cached state owners
650 * @head: resulting list of state owners
652 * Frees a list of state owners that was generated by
653 * nfs4_purge_state_owners
655 void nfs4_free_state_owners(struct list_head *head)
657 struct nfs4_state_owner *sp, *tmp;
659 list_for_each_entry_safe(sp, tmp, head, so_lru) {
660 list_del(&sp->so_lru);
661 nfs4_free_state_owner(sp);
665 static struct nfs4_state *
666 nfs4_alloc_open_state(void)
668 struct nfs4_state *state;
670 state = kzalloc(sizeof(*state), GFP_NOFS);
673 refcount_set(&state->count, 1);
674 INIT_LIST_HEAD(&state->lock_states);
675 spin_lock_init(&state->state_lock);
676 seqlock_init(&state->seqlock);
677 init_waitqueue_head(&state->waitq);
682 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
684 if (state->state == fmode)
686 /* NB! List reordering - see the reclaim code for why. */
687 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
688 if (fmode & FMODE_WRITE)
689 list_move(&state->open_states, &state->owner->so_states);
691 list_move_tail(&state->open_states, &state->owner->so_states);
693 state->state = fmode;
696 static struct nfs4_state *
697 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
699 struct nfs_inode *nfsi = NFS_I(inode);
700 struct nfs4_state *state;
702 list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) {
703 if (state->owner != owner)
705 if (!nfs4_valid_open_stateid(state))
707 if (refcount_inc_not_zero(&state->count))
714 nfs4_free_open_state(struct nfs4_state *state)
716 kfree_rcu(state, rcu_head);
720 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
722 struct nfs4_state *state, *new;
723 struct nfs_inode *nfsi = NFS_I(inode);
726 state = __nfs4_find_state_byowner(inode, owner);
730 new = nfs4_alloc_open_state();
731 spin_lock(&owner->so_lock);
732 spin_lock(&inode->i_lock);
733 state = __nfs4_find_state_byowner(inode, owner);
734 if (state == NULL && new != NULL) {
736 state->owner = owner;
737 atomic_inc(&owner->so_count);
738 list_add_rcu(&state->inode_states, &nfsi->open_states);
740 state->inode = inode;
741 spin_unlock(&inode->i_lock);
742 /* Note: The reclaim code dictates that we add stateless
743 * and read-only stateids to the end of the list */
744 list_add_tail(&state->open_states, &owner->so_states);
745 spin_unlock(&owner->so_lock);
747 spin_unlock(&inode->i_lock);
748 spin_unlock(&owner->so_lock);
750 nfs4_free_open_state(new);
756 void nfs4_put_open_state(struct nfs4_state *state)
758 struct inode *inode = state->inode;
759 struct nfs4_state_owner *owner = state->owner;
761 if (!refcount_dec_and_lock(&state->count, &owner->so_lock))
763 spin_lock(&inode->i_lock);
764 list_del_rcu(&state->inode_states);
765 list_del(&state->open_states);
766 spin_unlock(&inode->i_lock);
767 spin_unlock(&owner->so_lock);
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_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1025 seq = read_seqbegin(&state->seqlock);
1026 if (nfs4_state_match_open_stateid_other(state, dst)) {
1027 dst->seqid = state->open_stateid.seqid;
1030 } while (read_seqretry(&state->seqlock, seq));
1034 bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1037 const nfs4_stateid *src;
1042 src = &zero_stateid;
1043 seq = read_seqbegin(&state->seqlock);
1044 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1045 src = &state->open_stateid;
1048 nfs4_stateid_copy(dst, src);
1049 } while (read_seqretry(&state->seqlock, seq));
1054 * Byte-range lock aware utility to initialize the stateid of read/write
1057 int nfs4_select_rw_stateid(struct nfs4_state *state,
1058 fmode_t fmode, const struct nfs_lock_context *l_ctx,
1059 nfs4_stateid *dst, const struct cred **cred)
1063 if (!nfs4_valid_open_stateid(state))
1067 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
1069 /* A lost lock - don't even consider delegations */
1071 /* returns true if delegation stateid found and copied */
1072 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
1077 /* nfs4_copy_delegation_stateid() didn't over-write
1078 * dst, so it still has the lock stateid which we now
1082 ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
1084 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1089 struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
1091 struct nfs_seqid *new;
1093 new = kmalloc(sizeof(*new), gfp_mask);
1095 return ERR_PTR(-ENOMEM);
1096 new->sequence = counter;
1097 INIT_LIST_HEAD(&new->list);
1102 void nfs_release_seqid(struct nfs_seqid *seqid)
1104 struct nfs_seqid_counter *sequence;
1106 if (seqid == NULL || list_empty(&seqid->list))
1108 sequence = seqid->sequence;
1109 spin_lock(&sequence->lock);
1110 list_del_init(&seqid->list);
1111 if (!list_empty(&sequence->list)) {
1112 struct nfs_seqid *next;
1114 next = list_first_entry(&sequence->list,
1115 struct nfs_seqid, list);
1116 rpc_wake_up_queued_task(&sequence->wait, next->task);
1118 spin_unlock(&sequence->lock);
1121 void nfs_free_seqid(struct nfs_seqid *seqid)
1123 nfs_release_seqid(seqid);
1128 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1129 * failed with a seqid incrementing error -
1130 * see comments nfs4.h:seqid_mutating_error()
1132 static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
1137 case -NFS4ERR_BAD_SEQID:
1138 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1140 pr_warn_ratelimited("NFS: v4 server returned a bad"
1141 " sequence-id error on an"
1142 " unconfirmed sequence %p!\n",
1144 case -NFS4ERR_STALE_CLIENTID:
1145 case -NFS4ERR_STALE_STATEID:
1146 case -NFS4ERR_BAD_STATEID:
1147 case -NFS4ERR_BADXDR:
1148 case -NFS4ERR_RESOURCE:
1149 case -NFS4ERR_NOFILEHANDLE:
1150 case -NFS4ERR_MOVED:
1151 /* Non-seqid mutating errors */
1155 * Note: no locking needed as we are guaranteed to be first
1156 * on the sequence list
1158 seqid->sequence->counter++;
1161 void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1163 struct nfs4_state_owner *sp;
1168 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
1169 if (status == -NFS4ERR_BAD_SEQID)
1170 nfs4_reset_state_owner(sp);
1171 if (!nfs4_has_session(sp->so_server->nfs_client))
1172 nfs_increment_seqid(status, seqid);
1176 * Increment the seqid if the LOCK/LOCKU succeeded, or
1177 * failed with a seqid incrementing error -
1178 * see comments nfs4.h:seqid_mutating_error()
1180 void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1183 nfs_increment_seqid(status, seqid);
1186 int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1188 struct nfs_seqid_counter *sequence;
1193 sequence = seqid->sequence;
1194 spin_lock(&sequence->lock);
1196 if (list_empty(&seqid->list))
1197 list_add_tail(&seqid->list, &sequence->list);
1198 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1200 rpc_sleep_on(&sequence->wait, task, NULL);
1203 spin_unlock(&sequence->lock);
1208 static int nfs4_run_state_manager(void *);
1210 static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
1212 smp_mb__before_atomic();
1213 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
1214 smp_mb__after_atomic();
1215 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
1216 rpc_wake_up(&clp->cl_rpcwaitq);
1220 * Schedule the nfs_client asynchronous state management routine
1222 void nfs4_schedule_state_manager(struct nfs_client *clp)
1224 struct task_struct *task;
1225 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
1227 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
1228 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1230 __module_get(THIS_MODULE);
1231 refcount_inc(&clp->cl_count);
1233 /* The rcu_read_lock() is not strictly necessary, as the state
1234 * manager is the only thread that ever changes the rpc_xprt
1235 * after it's initialized. At this point, we're single threaded. */
1237 snprintf(buf, sizeof(buf), "%s-manager",
1238 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1240 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
1242 printk(KERN_ERR "%s: kthread_run: %ld\n",
1243 __func__, PTR_ERR(task));
1244 nfs4_clear_state_manager_bit(clp);
1245 nfs_put_client(clp);
1246 module_put(THIS_MODULE);
1251 * Schedule a lease recovery attempt
1253 void nfs4_schedule_lease_recovery(struct nfs_client *clp)
1257 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1258 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1259 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1261 nfs4_schedule_state_manager(clp);
1263 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
1266 * nfs4_schedule_migration_recovery - trigger migration recovery
1268 * @server: FSID that is migrating
1270 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1271 * value is returned.
1273 int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1275 struct nfs_client *clp = server->nfs_client;
1277 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1278 pr_err("NFS: volatile file handles not supported (server %s)\n",
1283 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1286 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1288 (unsigned long long)server->fsid.major,
1289 (unsigned long long)server->fsid.minor,
1292 set_bit(NFS_MIG_IN_TRANSITION,
1293 &((struct nfs_server *)server)->mig_status);
1294 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1296 nfs4_schedule_state_manager(clp);
1299 EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1302 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1304 * @clp: server to check for moved leases
1307 void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1309 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1310 __func__, clp->cl_clientid, clp->cl_hostname);
1312 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1313 nfs4_schedule_state_manager(clp);
1315 EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1317 int nfs4_wait_clnt_recover(struct nfs_client *clp)
1323 refcount_inc(&clp->cl_count);
1324 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1325 nfs_wait_bit_killable, TASK_KILLABLE);
1328 if (clp->cl_cons_state < 0)
1329 res = clp->cl_cons_state;
1331 nfs_put_client(clp);
1335 int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1340 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1341 ret = nfs4_wait_clnt_recover(clp);
1344 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1345 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1347 nfs4_schedule_state_manager(clp);
1354 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1355 * @clp: client to process
1357 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1358 * resend of the SETCLIENTID and hence re-establish the
1359 * callback channel. Then return all existing delegations.
1361 static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1363 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1364 nfs_expire_all_delegations(clp);
1365 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1369 void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1371 nfs40_handle_cb_pathdown(clp);
1372 nfs4_schedule_state_manager(clp);
1375 static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
1378 if (!nfs4_valid_open_stateid(state))
1380 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1381 /* Don't recover state that expired before the reboot */
1382 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1383 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1386 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1387 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1391 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1393 if (!nfs4_valid_open_stateid(state))
1395 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1396 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1397 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1398 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1402 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1404 struct nfs_client *clp = server->nfs_client;
1406 if (!nfs4_state_mark_reclaim_nograce(clp, state))
1408 nfs_inode_find_delegation_state_and_recover(state->inode,
1410 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1412 nfs4_schedule_state_manager(clp);
1415 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1417 static struct nfs4_lock_state *
1418 nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1419 const nfs4_stateid *stateid)
1421 struct nfs4_lock_state *pos;
1423 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1424 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1426 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1432 static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1433 const nfs4_stateid *stateid)
1437 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1438 spin_lock(&state->state_lock);
1439 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1441 spin_unlock(&state->state_lock);
1446 void nfs_inode_find_state_and_recover(struct inode *inode,
1447 const nfs4_stateid *stateid)
1449 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1450 struct nfs_inode *nfsi = NFS_I(inode);
1451 struct nfs_open_context *ctx;
1452 struct nfs4_state *state;
1456 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1460 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1461 nfs4_state_mark_reclaim_nograce(clp, state)) {
1465 if (nfs4_stateid_match_other(&state->open_stateid, stateid) &&
1466 nfs4_state_mark_reclaim_nograce(clp, state)) {
1470 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1471 nfs4_state_mark_reclaim_nograce(clp, state))
1476 nfs_inode_find_delegation_state_and_recover(inode, stateid);
1478 nfs4_schedule_state_manager(clp);
1481 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err)
1483 struct inode *inode = state->inode;
1484 struct nfs_inode *nfsi = NFS_I(inode);
1485 struct nfs_open_context *ctx;
1488 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1489 if (ctx->state != state)
1491 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1492 pr_warn("NFSv4: state recovery failed for open file %pd2, "
1493 "error = %d\n", ctx->dentry, err);
1498 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1500 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1501 nfs4_state_mark_open_context_bad(state, error);
1505 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1507 struct inode *inode = state->inode;
1508 struct nfs_inode *nfsi = NFS_I(inode);
1509 struct file_lock *fl;
1510 struct nfs4_lock_state *lsp;
1512 struct file_lock_context *flctx = inode->i_flctx;
1513 struct list_head *list;
1518 list = &flctx->flc_posix;
1520 /* Guard against delegation returns and new lock/unlock calls */
1521 down_write(&nfsi->rwsem);
1522 spin_lock(&flctx->flc_lock);
1524 list_for_each_entry(fl, list, fl_list) {
1525 if (nfs_file_open_context(fl->fl_file)->state != state)
1527 spin_unlock(&flctx->flc_lock);
1528 status = ops->recover_lock(state, fl);
1534 case -NFS4ERR_ADMIN_REVOKED:
1535 case -NFS4ERR_STALE_STATEID:
1536 case -NFS4ERR_BAD_STATEID:
1537 case -NFS4ERR_EXPIRED:
1538 case -NFS4ERR_NO_GRACE:
1539 case -NFS4ERR_STALE_CLIENTID:
1540 case -NFS4ERR_BADSESSION:
1541 case -NFS4ERR_BADSLOT:
1542 case -NFS4ERR_BAD_HIGH_SLOT:
1543 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1546 pr_err("NFS: %s: unhandled error %d\n",
1550 case -NFS4ERR_DENIED:
1551 case -NFS4ERR_RECLAIM_BAD:
1552 case -NFS4ERR_RECLAIM_CONFLICT:
1553 lsp = fl->fl_u.nfs4_fl.owner;
1555 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1558 spin_lock(&flctx->flc_lock);
1560 if (list == &flctx->flc_posix) {
1561 list = &flctx->flc_flock;
1564 spin_unlock(&flctx->flc_lock);
1566 up_write(&nfsi->rwsem);
1570 #ifdef CONFIG_NFS_V4_2
1571 static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state)
1573 struct nfs4_copy_state *copy;
1575 if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags))
1578 spin_lock(&sp->so_server->nfs_client->cl_lock);
1579 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1580 if (!nfs4_stateid_match_other(&state->stateid, ©->parent_state->stateid))
1583 complete(©->completion);
1586 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1588 #else /* !CONFIG_NFS_V4_2 */
1589 static inline void nfs42_complete_copies(struct nfs4_state_owner *sp,
1590 struct nfs4_state *state)
1593 #endif /* CONFIG_NFS_V4_2 */
1595 static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state,
1596 const struct nfs4_state_recovery_ops *ops)
1598 struct nfs4_lock_state *lock;
1601 status = ops->recover_open(sp, state);
1605 status = nfs4_reclaim_locks(state, ops);
1609 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1610 spin_lock(&state->state_lock);
1611 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1612 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1613 pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__);
1615 spin_unlock(&state->state_lock);
1618 nfs42_complete_copies(sp, state);
1619 clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1623 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1625 struct nfs4_state *state;
1626 unsigned int loop = 0;
1629 /* Note: we rely on the sp->so_states list being ordered
1630 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1632 * This is needed to ensure that the server won't give us any
1633 * read delegations that we have to return if, say, we are
1634 * recovering after a network partition or a reboot from a
1635 * server that doesn't support a grace period.
1637 spin_lock(&sp->so_lock);
1638 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1640 list_for_each_entry(state, &sp->so_states, open_states) {
1641 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1643 if (!nfs4_valid_open_stateid(state))
1645 if (state->state == 0)
1647 refcount_inc(&state->count);
1648 spin_unlock(&sp->so_lock);
1649 status = __nfs4_reclaim_open_state(sp, state, ops);
1657 printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status);
1665 /* Open state on this file cannot be recovered */
1666 nfs4_state_mark_recovery_failed(state, status);
1671 set_bit(ops->state_flag_bit, &state->flags);
1675 case -NFS4ERR_ADMIN_REVOKED:
1676 case -NFS4ERR_STALE_STATEID:
1677 case -NFS4ERR_OLD_STATEID:
1678 case -NFS4ERR_BAD_STATEID:
1679 case -NFS4ERR_RECLAIM_BAD:
1680 case -NFS4ERR_RECLAIM_CONFLICT:
1681 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1683 case -NFS4ERR_EXPIRED:
1684 case -NFS4ERR_NO_GRACE:
1685 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1687 case -NFS4ERR_STALE_CLIENTID:
1688 case -NFS4ERR_BADSESSION:
1689 case -NFS4ERR_BADSLOT:
1690 case -NFS4ERR_BAD_HIGH_SLOT:
1691 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1695 nfs4_put_open_state(state);
1696 spin_lock(&sp->so_lock);
1699 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1700 spin_unlock(&sp->so_lock);
1703 nfs4_put_open_state(state);
1704 spin_lock(&sp->so_lock);
1705 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1706 spin_unlock(&sp->so_lock);
1710 static void nfs4_clear_open_state(struct nfs4_state *state)
1712 struct nfs4_lock_state *lock;
1714 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1715 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1716 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1717 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1718 spin_lock(&state->state_lock);
1719 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1720 lock->ls_seqid.flags = 0;
1721 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1723 spin_unlock(&state->state_lock);
1726 static void nfs4_reset_seqids(struct nfs_server *server,
1727 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1729 struct nfs_client *clp = server->nfs_client;
1730 struct nfs4_state_owner *sp;
1731 struct rb_node *pos;
1732 struct nfs4_state *state;
1734 spin_lock(&clp->cl_lock);
1735 for (pos = rb_first(&server->state_owners);
1737 pos = rb_next(pos)) {
1738 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1739 sp->so_seqid.flags = 0;
1740 spin_lock(&sp->so_lock);
1741 list_for_each_entry(state, &sp->so_states, open_states) {
1742 if (mark_reclaim(clp, state))
1743 nfs4_clear_open_state(state);
1745 spin_unlock(&sp->so_lock);
1747 spin_unlock(&clp->cl_lock);
1750 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1751 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1753 struct nfs_server *server;
1756 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1757 nfs4_reset_seqids(server, mark_reclaim);
1761 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1763 /* Mark all delegations for reclaim */
1764 nfs_delegation_mark_reclaim(clp);
1765 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1768 static int nfs4_reclaim_complete(struct nfs_client *clp,
1769 const struct nfs4_state_recovery_ops *ops,
1770 const struct cred *cred)
1772 /* Notify the server we're done reclaiming our state */
1773 if (ops->reclaim_complete)
1774 return ops->reclaim_complete(clp, cred);
1778 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1780 struct nfs_client *clp = server->nfs_client;
1781 struct nfs4_state_owner *sp;
1782 struct rb_node *pos;
1783 struct nfs4_state *state;
1785 spin_lock(&clp->cl_lock);
1786 for (pos = rb_first(&server->state_owners);
1788 pos = rb_next(pos)) {
1789 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1790 spin_lock(&sp->so_lock);
1791 list_for_each_entry(state, &sp->so_states, open_states) {
1792 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1795 nfs4_state_mark_reclaim_nograce(clp, state);
1797 spin_unlock(&sp->so_lock);
1799 spin_unlock(&clp->cl_lock);
1802 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1804 struct nfs_server *server;
1806 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1810 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1811 nfs4_clear_reclaim_server(server);
1814 nfs_delegation_reap_unclaimed(clp);
1818 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1820 const struct nfs4_state_recovery_ops *ops;
1821 const struct cred *cred;
1824 if (!nfs4_state_clear_reclaim_reboot(clp))
1826 ops = clp->cl_mvops->reboot_recovery_ops;
1827 cred = nfs4_get_clid_cred(clp);
1828 err = nfs4_reclaim_complete(clp, ops, cred);
1830 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1831 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1834 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1836 nfs_mark_test_expired_all_delegations(clp);
1837 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1840 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1845 case -NFS4ERR_CB_PATH_DOWN:
1846 nfs40_handle_cb_pathdown(clp);
1848 case -NFS4ERR_NO_GRACE:
1849 nfs4_state_end_reclaim_reboot(clp);
1851 case -NFS4ERR_STALE_CLIENTID:
1852 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1853 nfs4_state_start_reclaim_reboot(clp);
1855 case -NFS4ERR_EXPIRED:
1856 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1857 nfs4_state_start_reclaim_nograce(clp);
1859 case -NFS4ERR_BADSESSION:
1860 case -NFS4ERR_BADSLOT:
1861 case -NFS4ERR_BAD_HIGH_SLOT:
1862 case -NFS4ERR_DEADSESSION:
1863 case -NFS4ERR_SEQ_FALSE_RETRY:
1864 case -NFS4ERR_SEQ_MISORDERED:
1865 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1866 /* Zero session reset errors */
1868 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1869 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1872 dprintk("%s: failed to handle error %d for server %s\n",
1873 __func__, error, clp->cl_hostname);
1876 dprintk("%s: handled error %d for server %s\n", __func__, error,
1881 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1883 struct nfs4_state_owner *sp;
1884 struct nfs_server *server;
1885 struct rb_node *pos;
1891 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1892 nfs4_purge_state_owners(server, &freeme);
1893 spin_lock(&clp->cl_lock);
1894 for (pos = rb_first(&server->state_owners);
1896 pos = rb_next(pos)) {
1898 struct nfs4_state_owner, so_server_node);
1899 if (!test_and_clear_bit(ops->owner_flag_bit,
1902 if (!atomic_inc_not_zero(&sp->so_count))
1904 spin_unlock(&clp->cl_lock);
1907 status = nfs4_reclaim_open_state(sp, ops);
1909 set_bit(ops->owner_flag_bit, &sp->so_flags);
1910 nfs4_put_state_owner(sp);
1911 status = nfs4_recovery_handle_error(clp, status);
1912 return (status != 0) ? status : -EAGAIN;
1915 nfs4_put_state_owner(sp);
1918 spin_unlock(&clp->cl_lock);
1921 nfs4_free_state_owners(&freeme);
1925 static int nfs4_check_lease(struct nfs_client *clp)
1927 const struct cred *cred;
1928 const struct nfs4_state_maintenance_ops *ops =
1929 clp->cl_mvops->state_renewal_ops;
1932 /* Is the client already known to have an expired lease? */
1933 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1935 cred = ops->get_state_renewal_cred(clp);
1937 cred = nfs4_get_clid_cred(clp);
1942 status = ops->renew_lease(clp, cred);
1944 if (status == -ETIMEDOUT) {
1945 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1949 return nfs4_recovery_handle_error(clp, status);
1952 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1953 * and for recoverable errors on EXCHANGE_ID for v4.1
1955 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1958 case -NFS4ERR_SEQ_MISORDERED:
1959 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1960 return -ESERVERFAULT;
1961 /* Lease confirmation error: retry after purging the lease */
1963 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1965 case -NFS4ERR_STALE_CLIENTID:
1966 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1967 nfs4_state_start_reclaim_reboot(clp);
1969 case -NFS4ERR_CLID_INUSE:
1970 pr_err("NFS: Server %s reports our clientid is in use\n",
1972 nfs_mark_client_ready(clp, -EPERM);
1973 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1976 case -NFS4ERR_DELAY:
1981 case -NFS4ERR_MINOR_VERS_MISMATCH:
1982 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1983 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1984 dprintk("%s: exit with error %d for server %s\n",
1985 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1986 return -EPROTONOSUPPORT;
1987 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1988 * in nfs4_exchange_id */
1990 dprintk("%s: exit with error %d for server %s\n", __func__,
1991 status, clp->cl_hostname);
1994 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1995 dprintk("%s: handled error %d for server %s\n", __func__, status,
2000 static int nfs4_establish_lease(struct nfs_client *clp)
2002 const struct cred *cred;
2003 const struct nfs4_state_recovery_ops *ops =
2004 clp->cl_mvops->reboot_recovery_ops;
2007 status = nfs4_begin_drain_session(clp);
2010 cred = nfs4_get_clid_cred(clp);
2013 status = ops->establish_clid(clp, cred);
2017 pnfs_destroy_all_layouts(clp);
2022 * Returns zero or a negative errno. NFS4ERR values are converted
2023 * to local errno values.
2025 static int nfs4_reclaim_lease(struct nfs_client *clp)
2029 status = nfs4_establish_lease(clp);
2031 return nfs4_handle_reclaim_lease_error(clp, status);
2032 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
2033 nfs4_state_start_reclaim_nograce(clp);
2034 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
2035 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
2036 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2037 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2041 static int nfs4_purge_lease(struct nfs_client *clp)
2045 status = nfs4_establish_lease(clp);
2047 return nfs4_handle_reclaim_lease_error(clp, status);
2048 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2049 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2050 nfs4_state_start_reclaim_nograce(clp);
2055 * Try remote migration of one FSID from a source server to a
2056 * destination server. The source server provides a list of
2057 * potential destinations.
2059 * Returns zero or a negative NFS4ERR status code.
2061 static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred)
2063 struct nfs_client *clp = server->nfs_client;
2064 struct nfs4_fs_locations *locations = NULL;
2065 struct inode *inode;
2069 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2070 (unsigned long long)server->fsid.major,
2071 (unsigned long long)server->fsid.minor,
2075 page = alloc_page(GFP_KERNEL);
2076 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2077 if (page == NULL || locations == NULL) {
2078 dprintk("<-- %s: no memory\n", __func__);
2082 inode = d_inode(server->super->s_root);
2083 result = nfs4_proc_get_locations(inode, locations, page, cred);
2085 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2090 result = -NFS4ERR_NXIO;
2091 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2092 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2097 status = nfs4_begin_drain_session(clp);
2101 status = nfs4_replace_transport(server, locations);
2103 dprintk("<-- %s: failed to replace transport: %d\n",
2109 dprintk("<-- %s: migration succeeded\n", __func__);
2116 pr_err("NFS: migration recovery failed (server %s)\n",
2118 set_bit(NFS_MIG_FAILED, &server->mig_status);
2124 * Returns zero or a negative NFS4ERR status code.
2126 static int nfs4_handle_migration(struct nfs_client *clp)
2128 const struct nfs4_state_maintenance_ops *ops =
2129 clp->cl_mvops->state_renewal_ops;
2130 struct nfs_server *server;
2131 const struct cred *cred;
2133 dprintk("%s: migration reported on \"%s\"\n", __func__,
2136 cred = ops->get_state_renewal_cred(clp);
2138 return -NFS4ERR_NOENT;
2143 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2146 if (server->mig_gen == clp->cl_mig_gen)
2148 server->mig_gen = clp->cl_mig_gen;
2150 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2151 &server->mig_status))
2155 status = nfs4_try_migration(server, cred);
2168 * Test each nfs_server on the clp's cl_superblocks list to see
2169 * if it's moved to another server. Stop when the server no longer
2170 * returns NFS4ERR_LEASE_MOVED.
2172 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2174 const struct nfs4_state_maintenance_ops *ops =
2175 clp->cl_mvops->state_renewal_ops;
2176 struct nfs_server *server;
2177 const struct cred *cred;
2179 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2182 cred = ops->get_state_renewal_cred(clp);
2184 return -NFS4ERR_NOENT;
2189 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2190 struct inode *inode;
2193 if (server->mig_gen == clp->cl_mig_gen)
2195 server->mig_gen = clp->cl_mig_gen;
2199 inode = d_inode(server->super->s_root);
2200 status = nfs4_proc_fsid_present(inode, cred);
2201 if (status != -NFS4ERR_MOVED)
2202 goto restart; /* wasn't this one */
2203 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2204 goto restart; /* there are more */
2215 * nfs4_discover_server_trunking - Detect server IP address trunking
2217 * @clp: nfs_client under test
2218 * @result: OUT: found nfs_client, or clp
2220 * Returns zero or a negative errno. If zero is returned,
2221 * an nfs_client pointer is planted in "result".
2223 * Note: since we are invoked in process context, and
2224 * not from inside the state manager, we cannot use
2225 * nfs4_handle_reclaim_lease_error().
2227 int nfs4_discover_server_trunking(struct nfs_client *clp,
2228 struct nfs_client **result)
2230 const struct nfs4_state_recovery_ops *ops =
2231 clp->cl_mvops->reboot_recovery_ops;
2232 struct rpc_clnt *clnt;
2233 const struct cred *cred;
2236 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2238 clnt = clp->cl_rpcclient;
2241 mutex_lock(&nfs_clid_init_mutex);
2244 cred = nfs4_get_clid_cred(clp);
2248 status = ops->detect_trunking(clp, result, cred);
2256 if (clnt->cl_softrtry)
2259 case -NFS4ERR_DELAY:
2263 case -NFS4ERR_STALE_CLIENTID:
2264 dprintk("NFS: %s after status %d, retrying\n",
2269 nfs4_root_machine_cred(clp);
2272 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2275 case -NFS4ERR_CLID_INUSE:
2276 case -NFS4ERR_WRONGSEC:
2277 /* No point in retrying if we already used RPC_AUTH_UNIX */
2278 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2282 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2284 status = PTR_ERR(clnt);
2287 /* Note: this is safe because we haven't yet marked the
2288 * client as ready, so we are the only user of
2291 clnt = xchg(&clp->cl_rpcclient, clnt);
2292 rpc_shutdown_client(clnt);
2293 clnt = clp->cl_rpcclient;
2296 case -NFS4ERR_MINOR_VERS_MISMATCH:
2297 status = -EPROTONOSUPPORT;
2301 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2302 * in nfs4_exchange_id */
2303 status = -EKEYEXPIRED;
2306 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2312 mutex_unlock(&nfs_clid_init_mutex);
2313 dprintk("NFS: %s: status = %d\n", __func__, status);
2317 #ifdef CONFIG_NFS_V4_1
2318 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2320 struct nfs_client *clp = session->clp;
2324 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2326 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2327 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2329 nfs4_schedule_state_manager(clp);
2331 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2333 void nfs41_notify_server(struct nfs_client *clp)
2335 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2336 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2337 nfs4_schedule_state_manager(clp);
2340 static void nfs4_reset_all_state(struct nfs_client *clp)
2342 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2343 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2344 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2345 nfs4_state_start_reclaim_nograce(clp);
2346 dprintk("%s: scheduling reset of all state for server %s!\n",
2347 __func__, clp->cl_hostname);
2348 nfs4_schedule_state_manager(clp);
2352 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2354 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2355 nfs4_state_start_reclaim_reboot(clp);
2356 dprintk("%s: server %s rebooted!\n", __func__,
2358 nfs4_schedule_state_manager(clp);
2362 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2364 nfs4_reset_all_state(clp);
2365 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2368 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2370 nfs4_state_start_reclaim_nograce(clp);
2371 nfs4_schedule_state_manager(clp);
2373 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2376 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2378 /* FIXME: For now, we destroy all layouts. */
2379 pnfs_destroy_all_layouts(clp);
2380 nfs_test_expired_all_delegations(clp);
2381 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2385 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2387 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2388 nfs4_schedule_state_manager(clp);
2390 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2394 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2396 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2397 &clp->cl_state) == 0)
2398 nfs4_schedule_state_manager(clp);
2401 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2407 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2408 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2410 * If we're called from the state manager thread, then assume we're
2411 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2412 * Those flags are expected to remain set until we're done
2413 * recovering (see RFC5661, section 18.46.3).
2418 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2419 nfs41_handle_server_reboot(clp);
2420 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2421 nfs41_handle_all_state_revoked(clp);
2422 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2423 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2424 nfs41_handle_some_state_revoked(clp);
2425 if (flags & SEQ4_STATUS_LEASE_MOVED)
2426 nfs4_schedule_lease_moved_recovery(clp);
2427 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2428 nfs41_handle_recallable_state_revoked(clp);
2430 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2431 nfs41_handle_backchannel_fault(clp);
2432 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2433 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2434 nfs41_handle_cb_path_down(clp);
2437 static int nfs4_reset_session(struct nfs_client *clp)
2439 const struct cred *cred;
2442 if (!nfs4_has_session(clp))
2444 status = nfs4_begin_drain_session(clp);
2447 cred = nfs4_get_clid_cred(clp);
2448 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2451 case -NFS4ERR_BADSESSION:
2452 case -NFS4ERR_DEADSESSION:
2454 case -NFS4ERR_BACK_CHAN_BUSY:
2455 case -NFS4ERR_DELAY:
2456 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2461 status = nfs4_recovery_handle_error(clp, status);
2465 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2466 status = nfs4_proc_create_session(clp, cred);
2468 dprintk("%s: session reset failed with status %d for server %s!\n",
2469 __func__, status, clp->cl_hostname);
2470 status = nfs4_handle_reclaim_lease_error(clp, status);
2473 nfs41_finish_session_reset(clp);
2474 dprintk("%s: session reset was successful for server %s!\n",
2475 __func__, clp->cl_hostname);
2481 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2483 const struct cred *cred;
2486 if (!nfs4_has_session(clp))
2488 ret = nfs4_begin_drain_session(clp);
2491 cred = nfs4_get_clid_cred(clp);
2492 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2494 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2497 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2498 __func__, clp->cl_hostname);
2500 case -NFS4ERR_DELAY:
2502 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2505 return nfs4_recovery_handle_error(clp, ret);
2509 #else /* CONFIG_NFS_V4_1 */
2510 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2512 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2516 #endif /* CONFIG_NFS_V4_1 */
2518 static void nfs4_state_manager(struct nfs_client *clp)
2521 const char *section = "", *section_sep = "";
2523 /* Ensure exclusive access to NFSv4 state */
2525 clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2526 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2527 section = "purge state";
2528 status = nfs4_purge_lease(clp);
2534 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2535 section = "lease expired";
2536 /* We're going to have to re-establish a clientid */
2537 status = nfs4_reclaim_lease(clp);
2543 /* Initialize or reset the session */
2544 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2545 section = "reset session";
2546 status = nfs4_reset_session(clp);
2547 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2553 /* Send BIND_CONN_TO_SESSION */
2554 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2556 section = "bind conn to session";
2557 status = nfs4_bind_conn_to_session(clp);
2563 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2564 section = "check lease";
2565 status = nfs4_check_lease(clp);
2571 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2572 section = "migration";
2573 status = nfs4_handle_migration(clp);
2578 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2579 section = "lease moved";
2580 status = nfs4_handle_lease_moved(clp);
2585 /* First recover reboot state... */
2586 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2587 section = "reclaim reboot";
2588 status = nfs4_do_reclaim(clp,
2589 clp->cl_mvops->reboot_recovery_ops);
2590 if (status == -EAGAIN)
2594 nfs4_state_end_reclaim_reboot(clp);
2597 /* Detect expired delegations... */
2598 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2599 section = "detect expired delegations";
2600 nfs_reap_expired_delegations(clp);
2604 /* Now recover expired state... */
2605 if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2606 section = "reclaim nograce";
2607 status = nfs4_do_reclaim(clp,
2608 clp->cl_mvops->nograce_recovery_ops);
2609 if (status == -EAGAIN)
2613 clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
2616 nfs4_end_drain_session(clp);
2617 nfs4_clear_state_manager_bit(clp);
2619 if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) {
2620 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2621 nfs_client_return_marked_delegations(clp);
2622 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
2624 clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state);
2627 /* Did we race with an attempt to give us more work? */
2628 if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state))
2630 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2632 } while (refcount_read(&clp->cl_count) > 1 && !signalled());
2636 if (strlen(section))
2638 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2639 " with error %d\n", section_sep, section,
2640 clp->cl_hostname, -status);
2643 nfs4_end_drain_session(clp);
2644 nfs4_clear_state_manager_bit(clp);
2647 static int nfs4_run_state_manager(void *ptr)
2649 struct nfs_client *clp = ptr;
2651 allow_signal(SIGKILL);
2652 nfs4_state_manager(clp);
2653 nfs_put_client(clp);
2654 module_put_and_exit(0);