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;
69 static DEFINE_MUTEX(nfs_clid_init_mutex);
71 int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
73 struct nfs4_setclientid_res clid = {
74 .clientid = clp->cl_clientid,
75 .confirm = clp->cl_confirm,
79 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
81 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
83 port = nn->nfs_callback_tcpport;
84 if (clp->cl_addr.ss_family == AF_INET6)
85 port = nn->nfs_callback_tcpport6;
87 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
90 clp->cl_clientid = clid.clientid;
91 clp->cl_confirm = clid.confirm;
92 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
94 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
97 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
98 nfs4_schedule_state_renewal(clp);
104 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
106 * @clp: nfs_client under test
107 * @result: OUT: found nfs_client, or clp
108 * @cred: credential to use for trunking test
110 * Returns zero, a negative errno, or a negative NFS4ERR status.
111 * If zero is returned, an nfs_client pointer is planted in
114 * Note: The returned client may not yet be marked ready.
116 int nfs40_discover_server_trunking(struct nfs_client *clp,
117 struct nfs_client **result,
118 struct rpc_cred *cred)
120 struct nfs4_setclientid_res clid = {
121 .clientid = clp->cl_clientid,
122 .confirm = clp->cl_confirm,
124 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
128 port = nn->nfs_callback_tcpport;
129 if (clp->cl_addr.ss_family == AF_INET6)
130 port = nn->nfs_callback_tcpport6;
132 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
135 clp->cl_clientid = clid.clientid;
136 clp->cl_confirm = clid.confirm;
138 status = nfs40_walk_client_list(clp, result, cred);
140 /* Sustain the lease, even if it's empty. If the clientid4
141 * goes stale it's of no use for trunking discovery. */
142 nfs4_schedule_state_renewal(*result);
144 /* If the client state need to recover, do it. */
146 nfs4_schedule_state_manager(clp);
152 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
154 struct rpc_cred *cred = NULL;
156 if (clp->cl_machine_cred != NULL)
157 cred = get_rpccred(clp->cl_machine_cred);
161 static void nfs4_root_machine_cred(struct nfs_client *clp)
163 struct rpc_cred *cred, *new;
165 new = rpc_lookup_machine_cred(NULL);
166 spin_lock(&clp->cl_lock);
167 cred = clp->cl_machine_cred;
168 clp->cl_machine_cred = new;
169 spin_unlock(&clp->cl_lock);
174 static struct rpc_cred *
175 nfs4_get_renew_cred_server_locked(struct nfs_server *server)
177 struct rpc_cred *cred = NULL;
178 struct nfs4_state_owner *sp;
181 for (pos = rb_first(&server->state_owners);
183 pos = rb_next(pos)) {
184 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
185 if (list_empty(&sp->so_states))
187 cred = get_rpccred(sp->so_cred);
194 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
195 * @clp: client state handle
197 * Returns an rpc_cred with reference count bumped, or NULL.
198 * Caller must hold clp->cl_lock.
200 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
202 struct rpc_cred *cred = NULL;
203 struct nfs_server *server;
205 /* Use machine credentials if available */
206 cred = nfs4_get_machine_cred_locked(clp);
211 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
212 cred = nfs4_get_renew_cred_server_locked(server);
222 static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
224 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
225 spin_lock(&tbl->slot_tbl_lock);
226 nfs41_wake_slot_table(tbl);
227 spin_unlock(&tbl->slot_tbl_lock);
231 static void nfs4_end_drain_session(struct nfs_client *clp)
233 struct nfs4_session *ses = clp->cl_session;
235 if (clp->cl_slot_tbl) {
236 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
241 nfs4_end_drain_slot_table(&ses->bc_slot_table);
242 nfs4_end_drain_slot_table(&ses->fc_slot_table);
246 static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
248 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
249 spin_lock(&tbl->slot_tbl_lock);
250 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
251 reinit_completion(&tbl->complete);
252 spin_unlock(&tbl->slot_tbl_lock);
253 return wait_for_completion_interruptible(&tbl->complete);
255 spin_unlock(&tbl->slot_tbl_lock);
259 static int nfs4_begin_drain_session(struct nfs_client *clp)
261 struct nfs4_session *ses = clp->cl_session;
264 if (clp->cl_slot_tbl)
265 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
268 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
272 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
275 #if defined(CONFIG_NFS_V4_1)
277 static int nfs41_setup_state_renewal(struct nfs_client *clp)
280 struct nfs_fsinfo fsinfo;
282 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
283 nfs4_schedule_state_renewal(clp);
287 status = nfs4_proc_get_lease_time(clp, &fsinfo);
289 /* Update lease time and schedule renewal */
290 spin_lock(&clp->cl_lock);
291 clp->cl_lease_time = fsinfo.lease_time * HZ;
292 clp->cl_last_renewal = jiffies;
293 spin_unlock(&clp->cl_lock);
295 nfs4_schedule_state_renewal(clp);
301 static void nfs41_finish_session_reset(struct nfs_client *clp)
303 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
304 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
305 /* create_session negotiated new slot table */
306 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
307 nfs41_setup_state_renewal(clp);
310 int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
314 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
316 status = nfs4_proc_exchange_id(clp, cred);
319 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
321 status = nfs4_proc_create_session(clp, cred);
324 nfs41_finish_session_reset(clp);
325 nfs_mark_client_ready(clp, NFS_CS_READY);
331 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
333 * @clp: nfs_client under test
334 * @result: OUT: found nfs_client, or clp
335 * @cred: credential to use for trunking test
337 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
338 * If NFS4_OK is returned, an nfs_client pointer is planted in
341 * Note: The returned client may not yet be marked ready.
343 int nfs41_discover_server_trunking(struct nfs_client *clp,
344 struct nfs_client **result,
345 struct rpc_cred *cred)
349 status = nfs4_proc_exchange_id(clp, cred);
350 if (status != NFS4_OK)
353 status = nfs41_walk_client_list(clp, result, cred);
359 /* Purge state if the client id was established in a prior instance */
360 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R)
361 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
363 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
364 nfs4_schedule_state_manager(clp);
365 status = nfs_wait_client_init_complete(clp);
371 #endif /* CONFIG_NFS_V4_1 */
374 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
375 * @clp: client state handle
377 * Returns an rpc_cred with reference count bumped, or NULL.
379 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
381 struct rpc_cred *cred;
383 spin_lock(&clp->cl_lock);
384 cred = nfs4_get_machine_cred_locked(clp);
385 spin_unlock(&clp->cl_lock);
389 static struct nfs4_state_owner *
390 nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
392 struct rb_node **p = &server->state_owners.rb_node,
394 struct nfs4_state_owner *sp;
398 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
400 if (cred < sp->so_cred)
401 p = &parent->rb_left;
402 else if (cred > sp->so_cred)
403 p = &parent->rb_right;
405 if (!list_empty(&sp->so_lru))
406 list_del_init(&sp->so_lru);
407 atomic_inc(&sp->so_count);
414 static struct nfs4_state_owner *
415 nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
417 struct nfs_server *server = new->so_server;
418 struct rb_node **p = &server->state_owners.rb_node,
420 struct nfs4_state_owner *sp;
425 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
427 if (new->so_cred < sp->so_cred)
428 p = &parent->rb_left;
429 else if (new->so_cred > sp->so_cred)
430 p = &parent->rb_right;
432 if (!list_empty(&sp->so_lru))
433 list_del_init(&sp->so_lru);
434 atomic_inc(&sp->so_count);
438 err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
441 rb_link_node(&new->so_server_node, parent, p);
442 rb_insert_color(&new->so_server_node, &server->state_owners);
447 nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
449 struct nfs_server *server = sp->so_server;
451 if (!RB_EMPTY_NODE(&sp->so_server_node))
452 rb_erase(&sp->so_server_node, &server->state_owners);
453 ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
457 nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
459 sc->create_time = ktime_get();
462 spin_lock_init(&sc->lock);
463 INIT_LIST_HEAD(&sc->list);
464 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
468 nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
470 rpc_destroy_wait_queue(&sc->wait);
474 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
475 * create a new state_owner.
478 static struct nfs4_state_owner *
479 nfs4_alloc_state_owner(struct nfs_server *server,
480 struct rpc_cred *cred,
483 struct nfs4_state_owner *sp;
485 sp = kzalloc(sizeof(*sp), gfp_flags);
488 sp->so_server = server;
489 sp->so_cred = get_rpccred(cred);
490 spin_lock_init(&sp->so_lock);
491 INIT_LIST_HEAD(&sp->so_states);
492 nfs4_init_seqid_counter(&sp->so_seqid);
493 atomic_set(&sp->so_count, 1);
494 INIT_LIST_HEAD(&sp->so_lru);
495 seqcount_init(&sp->so_reclaim_seqcount);
496 mutex_init(&sp->so_delegreturn_mutex);
501 nfs4_drop_state_owner(struct nfs4_state_owner *sp)
503 struct rb_node *rb_node = &sp->so_server_node;
505 if (!RB_EMPTY_NODE(rb_node)) {
506 struct nfs_server *server = sp->so_server;
507 struct nfs_client *clp = server->nfs_client;
509 spin_lock(&clp->cl_lock);
510 if (!RB_EMPTY_NODE(rb_node)) {
511 rb_erase(rb_node, &server->state_owners);
512 RB_CLEAR_NODE(rb_node);
514 spin_unlock(&clp->cl_lock);
518 static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
520 nfs4_destroy_seqid_counter(&sp->so_seqid);
521 put_rpccred(sp->so_cred);
525 static void nfs4_gc_state_owners(struct nfs_server *server)
527 struct nfs_client *clp = server->nfs_client;
528 struct nfs4_state_owner *sp, *tmp;
529 unsigned long time_min, time_max;
532 spin_lock(&clp->cl_lock);
534 time_min = (long)time_max - (long)clp->cl_lease_time;
535 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
536 /* NB: LRU is sorted so that oldest is at the head */
537 if (time_in_range(sp->so_expires, time_min, time_max))
539 list_move(&sp->so_lru, &doomed);
540 nfs4_remove_state_owner_locked(sp);
542 spin_unlock(&clp->cl_lock);
544 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
545 list_del(&sp->so_lru);
546 nfs4_free_state_owner(sp);
551 * nfs4_get_state_owner - Look up a state owner given a credential
552 * @server: nfs_server to search
553 * @cred: RPC credential to match
555 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
557 struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
558 struct rpc_cred *cred,
561 struct nfs_client *clp = server->nfs_client;
562 struct nfs4_state_owner *sp, *new;
564 spin_lock(&clp->cl_lock);
565 sp = nfs4_find_state_owner_locked(server, cred);
566 spin_unlock(&clp->cl_lock);
569 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
573 if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
575 spin_lock(&clp->cl_lock);
576 sp = nfs4_insert_state_owner_locked(new);
577 spin_unlock(&clp->cl_lock);
578 } while (sp == ERR_PTR(-EAGAIN));
580 nfs4_free_state_owner(new);
582 nfs4_gc_state_owners(server);
587 * nfs4_put_state_owner - Release a nfs4_state_owner
588 * @sp: state owner data to release
590 * Note that we keep released state owners on an LRU
592 * This caches valid state owners so that they can be
593 * reused, to avoid the OPEN_CONFIRM on minor version 0.
594 * It also pins the uniquifier of dropped state owners for
595 * a while, to ensure that those state owner names are
598 void nfs4_put_state_owner(struct nfs4_state_owner *sp)
600 struct nfs_server *server = sp->so_server;
601 struct nfs_client *clp = server->nfs_client;
603 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
606 sp->so_expires = jiffies;
607 list_add_tail(&sp->so_lru, &server->state_owners_lru);
608 spin_unlock(&clp->cl_lock);
612 * nfs4_purge_state_owners - Release all cached state owners
613 * @server: nfs_server with cached state owners to release
614 * @head: resulting list of state owners
616 * Called at umount time. Remaining state owners will be on
617 * the LRU with ref count of zero.
618 * Note that the state owners are not freed, but are added
619 * to the list @head, which can later be used as an argument
620 * to nfs4_free_state_owners.
622 void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head)
624 struct nfs_client *clp = server->nfs_client;
625 struct nfs4_state_owner *sp, *tmp;
627 spin_lock(&clp->cl_lock);
628 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
629 list_move(&sp->so_lru, head);
630 nfs4_remove_state_owner_locked(sp);
632 spin_unlock(&clp->cl_lock);
636 * nfs4_purge_state_owners - Release all cached state owners
637 * @head: resulting list of state owners
639 * Frees a list of state owners that was generated by
640 * nfs4_purge_state_owners
642 void nfs4_free_state_owners(struct list_head *head)
644 struct nfs4_state_owner *sp, *tmp;
646 list_for_each_entry_safe(sp, tmp, head, so_lru) {
647 list_del(&sp->so_lru);
648 nfs4_free_state_owner(sp);
652 static struct nfs4_state *
653 nfs4_alloc_open_state(void)
655 struct nfs4_state *state;
657 state = kzalloc(sizeof(*state), GFP_NOFS);
660 atomic_set(&state->count, 1);
661 INIT_LIST_HEAD(&state->lock_states);
662 spin_lock_init(&state->state_lock);
663 seqlock_init(&state->seqlock);
668 nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
670 if (state->state == fmode)
672 /* NB! List reordering - see the reclaim code for why. */
673 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
674 if (fmode & FMODE_WRITE)
675 list_move(&state->open_states, &state->owner->so_states);
677 list_move_tail(&state->open_states, &state->owner->so_states);
679 state->state = fmode;
682 static struct nfs4_state *
683 __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
685 struct nfs_inode *nfsi = NFS_I(inode);
686 struct nfs4_state *state;
688 list_for_each_entry(state, &nfsi->open_states, inode_states) {
689 if (state->owner != owner)
691 if (!nfs4_valid_open_stateid(state))
693 if (atomic_inc_not_zero(&state->count))
700 nfs4_free_open_state(struct nfs4_state *state)
706 nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
708 struct nfs4_state *state, *new;
709 struct nfs_inode *nfsi = NFS_I(inode);
711 spin_lock(&inode->i_lock);
712 state = __nfs4_find_state_byowner(inode, owner);
713 spin_unlock(&inode->i_lock);
716 new = nfs4_alloc_open_state();
717 spin_lock(&owner->so_lock);
718 spin_lock(&inode->i_lock);
719 state = __nfs4_find_state_byowner(inode, owner);
720 if (state == NULL && new != NULL) {
722 state->owner = owner;
723 atomic_inc(&owner->so_count);
724 list_add(&state->inode_states, &nfsi->open_states);
726 state->inode = inode;
727 spin_unlock(&inode->i_lock);
728 /* Note: The reclaim code dictates that we add stateless
729 * and read-only stateids to the end of the list */
730 list_add_tail(&state->open_states, &owner->so_states);
731 spin_unlock(&owner->so_lock);
733 spin_unlock(&inode->i_lock);
734 spin_unlock(&owner->so_lock);
736 nfs4_free_open_state(new);
742 void nfs4_put_open_state(struct nfs4_state *state)
744 struct inode *inode = state->inode;
745 struct nfs4_state_owner *owner = state->owner;
747 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
749 spin_lock(&inode->i_lock);
750 list_del(&state->inode_states);
751 list_del(&state->open_states);
752 spin_unlock(&inode->i_lock);
753 spin_unlock(&owner->so_lock);
755 nfs4_free_open_state(state);
756 nfs4_put_state_owner(owner);
760 * Close the current file.
762 static void __nfs4_close(struct nfs4_state *state,
763 fmode_t fmode, gfp_t gfp_mask, int wait)
765 struct nfs4_state_owner *owner = state->owner;
769 atomic_inc(&owner->so_count);
770 /* Protect against nfs4_find_state() */
771 spin_lock(&owner->so_lock);
772 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
779 case FMODE_READ|FMODE_WRITE:
782 newstate = FMODE_READ|FMODE_WRITE;
783 if (state->n_rdwr == 0) {
784 if (state->n_rdonly == 0) {
785 newstate &= ~FMODE_READ;
786 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
787 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
789 if (state->n_wronly == 0) {
790 newstate &= ~FMODE_WRITE;
791 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
792 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
795 clear_bit(NFS_DELEGATED_STATE, &state->flags);
797 nfs4_state_set_mode_locked(state, newstate);
798 spin_unlock(&owner->so_lock);
801 nfs4_put_open_state(state);
802 nfs4_put_state_owner(owner);
804 nfs4_do_close(state, gfp_mask, wait);
807 void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
809 __nfs4_close(state, fmode, GFP_NOFS, 0);
812 void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
814 __nfs4_close(state, fmode, GFP_KERNEL, 1);
818 * Search the state->lock_states for an existing lock_owner
819 * that is compatible with current->files
821 static struct nfs4_lock_state *
822 __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
824 struct nfs4_lock_state *pos;
825 list_for_each_entry(pos, &state->lock_states, ls_locks) {
826 if (pos->ls_owner != fl_owner)
828 atomic_inc(&pos->ls_count);
835 * Return a compatible lock_state. If no initialized lock_state structure
836 * exists, return an uninitialized one.
839 static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
841 struct nfs4_lock_state *lsp;
842 struct nfs_server *server = state->owner->so_server;
844 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
847 nfs4_init_seqid_counter(&lsp->ls_seqid);
848 atomic_set(&lsp->ls_count, 1);
849 lsp->ls_state = state;
850 lsp->ls_owner = fl_owner;
851 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
852 if (lsp->ls_seqid.owner_id < 0)
854 INIT_LIST_HEAD(&lsp->ls_locks);
861 void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
863 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
864 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
869 * Return a compatible lock_state. If no initialized lock_state structure
870 * exists, return an uninitialized one.
873 static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
875 struct nfs4_lock_state *lsp, *new = NULL;
878 spin_lock(&state->state_lock);
879 lsp = __nfs4_find_lock_state(state, owner);
883 list_add(&new->ls_locks, &state->lock_states);
884 set_bit(LK_STATE_IN_USE, &state->flags);
889 spin_unlock(&state->state_lock);
890 new = nfs4_alloc_lock_state(state, owner);
894 spin_unlock(&state->state_lock);
896 nfs4_free_lock_state(state->owner->so_server, new);
901 * Release reference to lock_state, and free it if we see that
902 * it is no longer in use
904 void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
906 struct nfs_server *server;
907 struct nfs4_state *state;
911 state = lsp->ls_state;
912 if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock))
914 list_del(&lsp->ls_locks);
915 if (list_empty(&state->lock_states))
916 clear_bit(LK_STATE_IN_USE, &state->flags);
917 spin_unlock(&state->state_lock);
918 server = state->owner->so_server;
919 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
920 struct nfs_client *clp = server->nfs_client;
922 clp->cl_mvops->free_lock_state(server, lsp);
924 nfs4_free_lock_state(server, lsp);
927 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
929 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
931 dst->fl_u.nfs4_fl.owner = lsp;
932 atomic_inc(&lsp->ls_count);
935 static void nfs4_fl_release_lock(struct file_lock *fl)
937 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
940 static const struct file_lock_operations nfs4_fl_lock_ops = {
941 .fl_copy_lock = nfs4_fl_copy_lock,
942 .fl_release_private = nfs4_fl_release_lock,
945 int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
947 struct nfs4_lock_state *lsp;
949 if (fl->fl_ops != NULL)
951 lsp = nfs4_get_lock_state(state, fl->fl_owner);
954 fl->fl_u.nfs4_fl.owner = lsp;
955 fl->fl_ops = &nfs4_fl_lock_ops;
959 static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
960 struct nfs4_state *state,
961 const struct nfs_lockowner *lockowner)
963 struct nfs4_lock_state *lsp;
968 if (lockowner == NULL)
971 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
974 fl_owner = lockowner->l_owner;
975 spin_lock(&state->state_lock);
976 lsp = __nfs4_find_lock_state(state, fl_owner);
977 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
979 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
980 nfs4_stateid_copy(dst, &lsp->ls_stateid);
983 spin_unlock(&state->state_lock);
984 nfs4_put_lock_state(lsp);
989 static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
991 const nfs4_stateid *src;
996 seq = read_seqbegin(&state->seqlock);
997 if (test_bit(NFS_OPEN_STATE, &state->flags))
998 src = &state->open_stateid;
999 nfs4_stateid_copy(dst, src);
1000 } while (read_seqretry(&state->seqlock, seq));
1004 * Byte-range lock aware utility to initialize the stateid of read/write
1007 int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
1008 fmode_t fmode, const struct nfs_lockowner *lockowner)
1010 int ret = nfs4_copy_lock_stateid(dst, state, lockowner);
1012 /* A lost lock - don't even consider delegations */
1014 /* returns true if delegation stateid found and copied */
1015 if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) {
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_drop_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 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1322 /* Don't recover state that expired before the reboot */
1323 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1324 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1327 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
1328 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1332 int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
1334 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1335 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1336 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
1337 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1341 int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
1343 struct nfs_client *clp = server->nfs_client;
1345 if (!nfs4_valid_open_stateid(state))
1347 nfs4_state_mark_reclaim_nograce(clp, state);
1348 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1350 nfs4_schedule_state_manager(clp);
1353 EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
1355 void nfs_inode_find_state_and_recover(struct inode *inode,
1356 const nfs4_stateid *stateid)
1358 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1359 struct nfs_inode *nfsi = NFS_I(inode);
1360 struct nfs_open_context *ctx;
1361 struct nfs4_state *state;
1364 spin_lock(&inode->i_lock);
1365 list_for_each_entry(ctx, &nfsi->open_files, list) {
1369 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
1371 if (!nfs4_stateid_match(&state->stateid, stateid))
1373 nfs4_state_mark_reclaim_nograce(clp, state);
1376 spin_unlock(&inode->i_lock);
1378 nfs4_schedule_state_manager(clp);
1381 static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1383 struct inode *inode = state->inode;
1384 struct nfs_inode *nfsi = NFS_I(inode);
1385 struct nfs_open_context *ctx;
1387 spin_lock(&inode->i_lock);
1388 list_for_each_entry(ctx, &nfsi->open_files, list) {
1389 if (ctx->state != state)
1391 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1393 spin_unlock(&inode->i_lock);
1396 static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1398 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
1399 nfs4_state_mark_open_context_bad(state);
1403 static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
1405 struct inode *inode = state->inode;
1406 struct nfs_inode *nfsi = NFS_I(inode);
1407 struct file_lock *fl;
1408 struct nfs4_lock_state *lsp;
1410 struct file_lock_context *flctx = inode->i_flctx;
1411 struct list_head *list;
1416 list = &flctx->flc_posix;
1418 /* Guard against delegation returns and new lock/unlock calls */
1419 down_write(&nfsi->rwsem);
1420 spin_lock(&flctx->flc_lock);
1422 list_for_each_entry(fl, list, fl_list) {
1423 if (nfs_file_open_context(fl->fl_file)->state != state)
1425 spin_unlock(&flctx->flc_lock);
1426 status = ops->recover_lock(state, fl);
1431 case -NFS4ERR_ADMIN_REVOKED:
1432 case -NFS4ERR_STALE_STATEID:
1433 case -NFS4ERR_BAD_STATEID:
1434 case -NFS4ERR_EXPIRED:
1435 case -NFS4ERR_NO_GRACE:
1436 case -NFS4ERR_STALE_CLIENTID:
1437 case -NFS4ERR_BADSESSION:
1438 case -NFS4ERR_BADSLOT:
1439 case -NFS4ERR_BAD_HIGH_SLOT:
1440 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1443 pr_err("NFS: %s: unhandled error %d\n",
1446 case -NFS4ERR_DENIED:
1447 case -NFS4ERR_RECLAIM_BAD:
1448 case -NFS4ERR_RECLAIM_CONFLICT:
1449 lsp = fl->fl_u.nfs4_fl.owner;
1451 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
1454 spin_lock(&flctx->flc_lock);
1456 if (list == &flctx->flc_posix) {
1457 list = &flctx->flc_flock;
1460 spin_unlock(&flctx->flc_lock);
1462 up_write(&nfsi->rwsem);
1466 static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
1468 struct nfs4_state *state;
1469 struct nfs4_lock_state *lock;
1472 /* Note: we rely on the sp->so_states list being ordered
1473 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1475 * This is needed to ensure that the server won't give us any
1476 * read delegations that we have to return if, say, we are
1477 * recovering after a network partition or a reboot from a
1478 * server that doesn't support a grace period.
1480 spin_lock(&sp->so_lock);
1481 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
1483 list_for_each_entry(state, &sp->so_states, open_states) {
1484 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1486 if (!nfs4_valid_open_stateid(state))
1488 if (state->state == 0)
1490 atomic_inc(&state->count);
1491 spin_unlock(&sp->so_lock);
1492 status = ops->recover_open(sp, state);
1494 status = nfs4_reclaim_locks(state, ops);
1496 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1497 spin_lock(&state->state_lock);
1498 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1499 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1500 pr_warn_ratelimited("NFS: "
1502 "failed!\n", __func__);
1504 spin_unlock(&state->state_lock);
1506 nfs4_put_open_state(state);
1507 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
1509 spin_lock(&sp->so_lock);
1515 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1523 /* Open state on this file cannot be recovered */
1524 nfs4_state_mark_recovery_failed(state, status);
1528 case -NFS4ERR_ADMIN_REVOKED:
1529 case -NFS4ERR_STALE_STATEID:
1530 case -NFS4ERR_BAD_STATEID:
1531 case -NFS4ERR_RECLAIM_BAD:
1532 case -NFS4ERR_RECLAIM_CONFLICT:
1533 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1535 case -NFS4ERR_EXPIRED:
1536 case -NFS4ERR_NO_GRACE:
1537 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
1538 case -NFS4ERR_STALE_CLIENTID:
1539 case -NFS4ERR_BADSESSION:
1540 case -NFS4ERR_BADSLOT:
1541 case -NFS4ERR_BAD_HIGH_SLOT:
1542 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1545 nfs4_put_open_state(state);
1546 spin_lock(&sp->so_lock);
1549 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1550 spin_unlock(&sp->so_lock);
1553 nfs4_put_open_state(state);
1554 spin_lock(&sp->so_lock);
1555 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
1556 spin_unlock(&sp->so_lock);
1560 static void nfs4_clear_open_state(struct nfs4_state *state)
1562 struct nfs4_lock_state *lock;
1564 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1565 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1566 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1567 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1568 spin_lock(&state->state_lock);
1569 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1570 lock->ls_seqid.flags = 0;
1571 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
1573 spin_unlock(&state->state_lock);
1576 static void nfs4_reset_seqids(struct nfs_server *server,
1577 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1579 struct nfs_client *clp = server->nfs_client;
1580 struct nfs4_state_owner *sp;
1581 struct rb_node *pos;
1582 struct nfs4_state *state;
1584 spin_lock(&clp->cl_lock);
1585 for (pos = rb_first(&server->state_owners);
1587 pos = rb_next(pos)) {
1588 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1589 sp->so_seqid.flags = 0;
1590 spin_lock(&sp->so_lock);
1591 list_for_each_entry(state, &sp->so_states, open_states) {
1592 if (mark_reclaim(clp, state))
1593 nfs4_clear_open_state(state);
1595 spin_unlock(&sp->so_lock);
1597 spin_unlock(&clp->cl_lock);
1600 static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1601 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1603 struct nfs_server *server;
1606 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1607 nfs4_reset_seqids(server, mark_reclaim);
1611 static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1613 /* Mark all delegations for reclaim */
1614 nfs_delegation_mark_reclaim(clp);
1615 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1618 static int nfs4_reclaim_complete(struct nfs_client *clp,
1619 const struct nfs4_state_recovery_ops *ops,
1620 struct rpc_cred *cred)
1622 /* Notify the server we're done reclaiming our state */
1623 if (ops->reclaim_complete)
1624 return ops->reclaim_complete(clp, cred);
1628 static void nfs4_clear_reclaim_server(struct nfs_server *server)
1630 struct nfs_client *clp = server->nfs_client;
1631 struct nfs4_state_owner *sp;
1632 struct rb_node *pos;
1633 struct nfs4_state *state;
1635 spin_lock(&clp->cl_lock);
1636 for (pos = rb_first(&server->state_owners);
1638 pos = rb_next(pos)) {
1639 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
1640 spin_lock(&sp->so_lock);
1641 list_for_each_entry(state, &sp->so_states, open_states) {
1642 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1645 nfs4_state_mark_reclaim_nograce(clp, state);
1647 spin_unlock(&sp->so_lock);
1649 spin_unlock(&clp->cl_lock);
1652 static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1654 struct nfs_server *server;
1656 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1660 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1661 nfs4_clear_reclaim_server(server);
1664 nfs_delegation_reap_unclaimed(clp);
1668 static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1670 const struct nfs4_state_recovery_ops *ops;
1671 struct rpc_cred *cred;
1674 if (!nfs4_state_clear_reclaim_reboot(clp))
1676 ops = clp->cl_mvops->reboot_recovery_ops;
1677 cred = nfs4_get_clid_cred(clp);
1678 err = nfs4_reclaim_complete(clp, ops, cred);
1680 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1681 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1684 static void nfs_delegation_clear_all(struct nfs_client *clp)
1686 nfs_delegation_mark_reclaim(clp);
1687 nfs_delegation_reap_unclaimed(clp);
1690 static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1692 nfs_delegation_clear_all(clp);
1693 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1696 static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
1701 case -NFS4ERR_CB_PATH_DOWN:
1702 nfs40_handle_cb_pathdown(clp);
1704 case -NFS4ERR_NO_GRACE:
1705 nfs4_state_end_reclaim_reboot(clp);
1707 case -NFS4ERR_STALE_CLIENTID:
1708 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1709 nfs4_state_start_reclaim_reboot(clp);
1711 case -NFS4ERR_EXPIRED:
1712 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1713 nfs4_state_start_reclaim_nograce(clp);
1715 case -NFS4ERR_BADSESSION:
1716 case -NFS4ERR_BADSLOT:
1717 case -NFS4ERR_BAD_HIGH_SLOT:
1718 case -NFS4ERR_DEADSESSION:
1719 case -NFS4ERR_SEQ_FALSE_RETRY:
1720 case -NFS4ERR_SEQ_MISORDERED:
1721 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
1722 /* Zero session reset errors */
1724 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1725 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1728 dprintk("%s: failed to handle error %d for server %s\n",
1729 __func__, error, clp->cl_hostname);
1732 dprintk("%s: handled error %d for server %s\n", __func__, error,
1737 static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
1739 struct nfs4_state_owner *sp;
1740 struct nfs_server *server;
1741 struct rb_node *pos;
1747 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
1748 nfs4_purge_state_owners(server, &freeme);
1749 spin_lock(&clp->cl_lock);
1750 for (pos = rb_first(&server->state_owners);
1752 pos = rb_next(pos)) {
1754 struct nfs4_state_owner, so_server_node);
1755 if (!test_and_clear_bit(ops->owner_flag_bit,
1758 if (!atomic_inc_not_zero(&sp->so_count))
1760 spin_unlock(&clp->cl_lock);
1763 status = nfs4_reclaim_open_state(sp, ops);
1765 set_bit(ops->owner_flag_bit, &sp->so_flags);
1766 nfs4_put_state_owner(sp);
1767 status = nfs4_recovery_handle_error(clp, status);
1768 return (status != 0) ? status : -EAGAIN;
1771 nfs4_put_state_owner(sp);
1774 spin_unlock(&clp->cl_lock);
1777 nfs4_free_state_owners(&freeme);
1781 static int nfs4_check_lease(struct nfs_client *clp)
1783 struct rpc_cred *cred;
1784 const struct nfs4_state_maintenance_ops *ops =
1785 clp->cl_mvops->state_renewal_ops;
1788 /* Is the client already known to have an expired lease? */
1789 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1791 spin_lock(&clp->cl_lock);
1792 cred = ops->get_state_renewal_cred_locked(clp);
1793 spin_unlock(&clp->cl_lock);
1795 cred = nfs4_get_clid_cred(clp);
1800 status = ops->renew_lease(clp, cred);
1802 if (status == -ETIMEDOUT) {
1803 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1807 return nfs4_recovery_handle_error(clp, status);
1810 /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1811 * and for recoverable errors on EXCHANGE_ID for v4.1
1813 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1816 case -NFS4ERR_SEQ_MISORDERED:
1817 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1818 return -ESERVERFAULT;
1819 /* Lease confirmation error: retry after purging the lease */
1821 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1823 case -NFS4ERR_STALE_CLIENTID:
1824 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1825 nfs4_state_start_reclaim_reboot(clp);
1827 case -NFS4ERR_CLID_INUSE:
1828 pr_err("NFS: Server %s reports our clientid is in use\n",
1830 nfs_mark_client_ready(clp, -EPERM);
1831 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1834 case -NFS4ERR_DELAY:
1840 case -NFS4ERR_MINOR_VERS_MISMATCH:
1841 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1842 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
1843 dprintk("%s: exit with error %d for server %s\n",
1844 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
1845 return -EPROTONOSUPPORT;
1846 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1847 * in nfs4_exchange_id */
1849 dprintk("%s: exit with error %d for server %s\n", __func__,
1850 status, clp->cl_hostname);
1853 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1854 dprintk("%s: handled error %d for server %s\n", __func__, status,
1859 static int nfs4_establish_lease(struct nfs_client *clp)
1861 struct rpc_cred *cred;
1862 const struct nfs4_state_recovery_ops *ops =
1863 clp->cl_mvops->reboot_recovery_ops;
1866 nfs4_begin_drain_session(clp);
1867 cred = nfs4_get_clid_cred(clp);
1870 status = ops->establish_clid(clp, cred);
1874 pnfs_destroy_all_layouts(clp);
1879 * Returns zero or a negative errno. NFS4ERR values are converted
1880 * to local errno values.
1882 static int nfs4_reclaim_lease(struct nfs_client *clp)
1886 status = nfs4_establish_lease(clp);
1888 return nfs4_handle_reclaim_lease_error(clp, status);
1889 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1890 nfs4_state_start_reclaim_nograce(clp);
1891 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1892 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1893 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1894 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1898 static int nfs4_purge_lease(struct nfs_client *clp)
1902 status = nfs4_establish_lease(clp);
1904 return nfs4_handle_reclaim_lease_error(clp, status);
1905 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
1906 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1907 nfs4_state_start_reclaim_nograce(clp);
1912 * Try remote migration of one FSID from a source server to a
1913 * destination server. The source server provides a list of
1914 * potential destinations.
1916 * Returns zero or a negative NFS4ERR status code.
1918 static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
1920 struct nfs_client *clp = server->nfs_client;
1921 struct nfs4_fs_locations *locations = NULL;
1922 struct inode *inode;
1926 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
1927 (unsigned long long)server->fsid.major,
1928 (unsigned long long)server->fsid.minor,
1932 page = alloc_page(GFP_KERNEL);
1933 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1934 if (page == NULL || locations == NULL) {
1935 dprintk("<-- %s: no memory\n", __func__);
1939 inode = d_inode(server->super->s_root);
1940 result = nfs4_proc_get_locations(inode, locations, page, cred);
1942 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
1947 result = -NFS4ERR_NXIO;
1948 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
1949 dprintk("<-- %s: No fs_locations data, migration skipped\n",
1954 nfs4_begin_drain_session(clp);
1956 status = nfs4_replace_transport(server, locations);
1958 dprintk("<-- %s: failed to replace transport: %d\n",
1964 dprintk("<-- %s: migration succeeded\n", __func__);
1971 pr_err("NFS: migration recovery failed (server %s)\n",
1973 set_bit(NFS_MIG_FAILED, &server->mig_status);
1979 * Returns zero or a negative NFS4ERR status code.
1981 static int nfs4_handle_migration(struct nfs_client *clp)
1983 const struct nfs4_state_maintenance_ops *ops =
1984 clp->cl_mvops->state_renewal_ops;
1985 struct nfs_server *server;
1986 struct rpc_cred *cred;
1988 dprintk("%s: migration reported on \"%s\"\n", __func__,
1991 spin_lock(&clp->cl_lock);
1992 cred = ops->get_state_renewal_cred_locked(clp);
1993 spin_unlock(&clp->cl_lock);
1995 return -NFS4ERR_NOENT;
2000 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2003 if (server->mig_gen == clp->cl_mig_gen)
2005 server->mig_gen = clp->cl_mig_gen;
2007 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2008 &server->mig_status))
2012 status = nfs4_try_migration(server, cred);
2025 * Test each nfs_server on the clp's cl_superblocks list to see
2026 * if it's moved to another server. Stop when the server no longer
2027 * returns NFS4ERR_LEASE_MOVED.
2029 static int nfs4_handle_lease_moved(struct nfs_client *clp)
2031 const struct nfs4_state_maintenance_ops *ops =
2032 clp->cl_mvops->state_renewal_ops;
2033 struct nfs_server *server;
2034 struct rpc_cred *cred;
2036 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2039 spin_lock(&clp->cl_lock);
2040 cred = ops->get_state_renewal_cred_locked(clp);
2041 spin_unlock(&clp->cl_lock);
2043 return -NFS4ERR_NOENT;
2048 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2049 struct inode *inode;
2052 if (server->mig_gen == clp->cl_mig_gen)
2054 server->mig_gen = clp->cl_mig_gen;
2058 inode = d_inode(server->super->s_root);
2059 status = nfs4_proc_fsid_present(inode, cred);
2060 if (status != -NFS4ERR_MOVED)
2061 goto restart; /* wasn't this one */
2062 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2063 goto restart; /* there are more */
2074 * nfs4_discover_server_trunking - Detect server IP address trunking
2076 * @clp: nfs_client under test
2077 * @result: OUT: found nfs_client, or clp
2079 * Returns zero or a negative errno. If zero is returned,
2080 * an nfs_client pointer is planted in "result".
2082 * Note: since we are invoked in process context, and
2083 * not from inside the state manager, we cannot use
2084 * nfs4_handle_reclaim_lease_error().
2086 int nfs4_discover_server_trunking(struct nfs_client *clp,
2087 struct nfs_client **result)
2089 const struct nfs4_state_recovery_ops *ops =
2090 clp->cl_mvops->reboot_recovery_ops;
2091 struct rpc_clnt *clnt;
2092 struct rpc_cred *cred;
2095 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2097 clnt = clp->cl_rpcclient;
2100 mutex_lock(&nfs_clid_init_mutex);
2103 cred = nfs4_get_clid_cred(clp);
2107 status = ops->detect_trunking(clp, result, cred);
2113 if (clnt->cl_softrtry)
2115 case -NFS4ERR_DELAY:
2118 case -NFS4ERR_STALE_CLIENTID:
2119 dprintk("NFS: %s after status %d, retrying\n",
2124 nfs4_root_machine_cred(clp);
2127 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
2129 case -NFS4ERR_CLID_INUSE:
2130 case -NFS4ERR_WRONGSEC:
2131 /* No point in retrying if we already used RPC_AUTH_UNIX */
2132 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2136 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
2138 status = PTR_ERR(clnt);
2141 /* Note: this is safe because we haven't yet marked the
2142 * client as ready, so we are the only user of
2145 clnt = xchg(&clp->cl_rpcclient, clnt);
2146 rpc_shutdown_client(clnt);
2147 clnt = clp->cl_rpcclient;
2150 case -NFS4ERR_MINOR_VERS_MISMATCH:
2151 status = -EPROTONOSUPPORT;
2155 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2156 * in nfs4_exchange_id */
2157 status = -EKEYEXPIRED;
2160 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2166 mutex_unlock(&nfs_clid_init_mutex);
2167 dprintk("NFS: %s: status = %d\n", __func__, status);
2171 #ifdef CONFIG_NFS_V4_1
2172 void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
2174 struct nfs_client *clp = session->clp;
2178 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2180 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2181 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2183 nfs4_schedule_lease_recovery(clp);
2185 EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
2187 void nfs41_notify_server(struct nfs_client *clp)
2189 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2190 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2191 nfs4_schedule_state_manager(clp);
2194 static void nfs4_reset_all_state(struct nfs_client *clp)
2196 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2197 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2198 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
2199 nfs4_state_start_reclaim_nograce(clp);
2200 dprintk("%s: scheduling reset of all state for server %s!\n",
2201 __func__, clp->cl_hostname);
2202 nfs4_schedule_state_manager(clp);
2206 static void nfs41_handle_server_reboot(struct nfs_client *clp)
2208 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2209 nfs4_state_start_reclaim_reboot(clp);
2210 dprintk("%s: server %s rebooted!\n", __func__,
2212 nfs4_schedule_state_manager(clp);
2216 static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
2218 nfs4_reset_all_state(clp);
2219 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2222 static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2224 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
2225 nfs4_schedule_state_manager(clp);
2227 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2230 static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2232 /* FIXME: For now, we destroy all layouts. */
2233 pnfs_destroy_all_layouts(clp);
2234 /* FIXME: For now, we test all delegations+open state+locks. */
2235 nfs41_handle_some_state_revoked(clp);
2236 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2240 static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
2242 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2243 nfs4_schedule_state_manager(clp);
2245 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2249 static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2251 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2252 &clp->cl_state) == 0)
2253 nfs4_schedule_state_manager(clp);
2256 void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
2261 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2262 __func__, clp->cl_hostname, clp->cl_clientid, flags);
2264 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
2265 nfs41_handle_server_reboot(clp);
2266 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2267 nfs41_handle_all_state_revoked(clp);
2268 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
2269 SEQ4_STATUS_ADMIN_STATE_REVOKED))
2270 nfs41_handle_some_state_revoked(clp);
2271 if (flags & SEQ4_STATUS_LEASE_MOVED)
2272 nfs4_schedule_lease_moved_recovery(clp);
2273 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
2274 nfs41_handle_recallable_state_revoked(clp);
2275 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2276 nfs41_handle_backchannel_fault(clp);
2277 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2278 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
2279 nfs41_handle_cb_path_down(clp);
2282 static int nfs4_reset_session(struct nfs_client *clp)
2284 struct rpc_cred *cred;
2287 if (!nfs4_has_session(clp))
2289 nfs4_begin_drain_session(clp);
2290 cred = nfs4_get_clid_cred(clp);
2291 status = nfs4_proc_destroy_session(clp->cl_session, cred);
2294 case -NFS4ERR_BADSESSION:
2295 case -NFS4ERR_DEADSESSION:
2297 case -NFS4ERR_BACK_CHAN_BUSY:
2298 case -NFS4ERR_DELAY:
2299 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2304 status = nfs4_recovery_handle_error(clp, status);
2308 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
2309 status = nfs4_proc_create_session(clp, cred);
2311 dprintk("%s: session reset failed with status %d for server %s!\n",
2312 __func__, status, clp->cl_hostname);
2313 status = nfs4_handle_reclaim_lease_error(clp, status);
2316 nfs41_finish_session_reset(clp);
2317 dprintk("%s: session reset was successful for server %s!\n",
2318 __func__, clp->cl_hostname);
2325 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2327 struct rpc_cred *cred;
2330 if (!nfs4_has_session(clp))
2332 nfs4_begin_drain_session(clp);
2333 cred = nfs4_get_clid_cred(clp);
2334 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2337 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2340 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2341 __func__, clp->cl_hostname);
2343 case -NFS4ERR_DELAY:
2345 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2348 return nfs4_recovery_handle_error(clp, ret);
2352 #else /* CONFIG_NFS_V4_1 */
2353 static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
2355 static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2359 #endif /* CONFIG_NFS_V4_1 */
2361 static void nfs4_state_manager(struct nfs_client *clp)
2364 const char *section = "", *section_sep = "";
2366 /* Ensure exclusive access to NFSv4 state */
2368 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
2369 section = "purge state";
2370 status = nfs4_purge_lease(clp);
2376 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
2377 section = "lease expired";
2378 /* We're going to have to re-establish a clientid */
2379 status = nfs4_reclaim_lease(clp);
2385 /* Initialize or reset the session */
2386 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
2387 section = "reset session";
2388 status = nfs4_reset_session(clp);
2389 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2395 /* Send BIND_CONN_TO_SESSION */
2396 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2398 section = "bind conn to session";
2399 status = nfs4_bind_conn_to_session(clp);
2405 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2406 section = "check lease";
2407 status = nfs4_check_lease(clp);
2413 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2414 section = "migration";
2415 status = nfs4_handle_migration(clp);
2420 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2421 section = "lease moved";
2422 status = nfs4_handle_lease_moved(clp);
2427 /* First recover reboot state... */
2428 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
2429 section = "reclaim reboot";
2430 status = nfs4_do_reclaim(clp,
2431 clp->cl_mvops->reboot_recovery_ops);
2432 if (status == -EAGAIN)
2436 nfs4_state_end_reclaim_reboot(clp);
2439 /* Now recover expired state... */
2440 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
2441 section = "reclaim nograce";
2442 status = nfs4_do_reclaim(clp,
2443 clp->cl_mvops->nograce_recovery_ops);
2444 if (status == -EAGAIN)
2450 nfs4_end_drain_session(clp);
2451 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2452 nfs_client_return_marked_delegations(clp);
2456 nfs4_clear_state_manager_bit(clp);
2457 /* Did we race with an attempt to give us more work? */
2458 if (clp->cl_state == 0)
2460 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2462 } while (atomic_read(&clp->cl_count) > 1);
2465 if (strlen(section))
2467 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2468 " with error %d\n", section_sep, section,
2469 clp->cl_hostname, -status);
2471 nfs4_end_drain_session(clp);
2472 nfs4_clear_state_manager_bit(clp);
2475 static int nfs4_run_state_manager(void *ptr)
2477 struct nfs_client *clp = ptr;
2479 allow_signal(SIGKILL);
2480 nfs4_state_manager(clp);
2481 nfs_put_client(clp);
2482 module_put_and_exit(0);